REFRIGERANT DISTRIBUTION DEVICE AND HEAT EXCHANGER

Abstract

A refrigerant distribution device and a heat exchanger are provided. The refrigerant distribution device includes an inner distribution pipe and an outer distribution pipe, the outer distribution pipe is sleeved outside the inner distribution pipe. The inner distribution pipe is provided with a plurality of hole units, and each of the plurality of hole units includes a plurality of inner distribution holes. The plurality of inner distribution holes are arranged at intervals. The outer distribution pipe is provided with an outer distribution hole. By adjusting a relative position between the inner distribution pipe and the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of international patent application No. PCT/CN2022/124346, filed on Oct. 10, 2022, which itself claims priority to Chinese patent application No. 202122479746.3, filed on Oct. 14, 2021, and titled “REFRIGERANT DISTRIBUTION DEVICE AND HEAT EXCHANGER”. The contents of the above identified application are hereby incorporated herein in their entireties by reference.

TECHNICAL FIELD

The present disclosure relates to the field of refrigeration technology, and in particular, to a refrigerant distribution device and a heat exchanger.

BACKGROUND

A refrigerant distribution device is used in a heat exchanger to distribute refrigerant in a collecting pipe of the heat exchanger. At present, a refrigerant flow distributed by the refrigerant distribution device in the heat exchanger is fixed. If the refrigerant flow needs to be adjusted, the refrigerant distribution device must be replaced, which greatly affects working efficiency.

SUMMARY

According to various embodiments of the present disclosure, a refrigerant distribution device and a heat exchanger are provided.

The present disclosure provides a refrigerant distribution device. The refrigerant distribution device includes an inner distribution pipe and an outer distribution pipe. The outer distribution pipe is sleeved outside the inner distribution pipe. The inner distribution pipe is provided with a plurality of hole units, and each of the plurality of hole units includes a plurality of inner distribution holes; the plurality of inner distribution holes are arranged at intervals; the outer distribution pipe is provided with an outer distribution hole. By adjusting a relative position between the inner distribution pipe and the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

In some embodiments, the plurality of inner distribution holes of each of the plurality of hole units are arranged at intervals along an axis of the inner distribution pipe.

In some embodiments, the plurality of hole units are arranged along an axis of the inner distribution pipe; and by adjusting a length of the inner distribution pipe extending into the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

In some embodiments, the plurality of hole units are arranged along a circumferential direction of the inner distribution pipe. And by adjusting a rotation angle of the inner distribution pipe along the circumferential direction of the inner distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

In some embodiments, the outer distribution pipe is provided with a plurality of outer distribution holes, and the plurality of outer distribution holes are arranged at intervals along an axis of the outer distribution pipe.

In some embodiments, the outer distribution pipe is provided with a plurality of outer distribution holes, each of the plurality of outer distribution holes is in a circular shape, and the plurality of outer distribution holes are arranged at intervals along an axis of the outer distribution pipe.

In some embodiments, the outer distribution pipe is provided with one outer distribution hole, the outer distribution hole is in an elongated shape and the outer distribution hole extends along an axis of the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the elongated-shaped outer distribution hole correspondingly.

In some embodiments, a size of each of the plurality of inner distribution holes in each of the plurality of hole units is the same.

In some embodiments, a distance between adjacent two of the plurality of inner distribution holes in each of the plurality of hole units is the same.

In some embodiments, a distance between adjacent two of the plurality of hole units is the same.

The present disclosure further provides a heat exchanger including a collecting pipe, a plurality of heat exchange pipes and the above refrigerant distribution device, the collecting pipe is sleeved outside the outer distribution pipe, and the outer distribution pipe is in communication with the collecting pipe by the outer distribution hole. The plurality of heat exchange pipes extend along an axis of the collecting pipe and are arranged at intervals, and the plurality of heat exchange pipes are in communication with the collecting pipe.

Details of one or more embodiments of this application are presented in the attached drawings and descriptions below. And other features, purposes and advantages of this application will become apparent from the description, drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better description and illustration of embodiments and/or examples of those disclosures disclosed herein, reference may be made to one or more attached drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed disclosures, currently described embodiments and/or examples, and currently understood best modes of these disclosures.

FIG. 1 is a schematic view of a heat exchanger according to one or more embodiments.

FIG. 2 is an enlarged view of portion A in FIG. 1.

FIG. 3 is a schematic view of an inner distribution pipe in FIG. 1.

FIG. 4 is an enlarged view of a part of the inner distribution pipe in FIG. 3.

FIG. 5 is a schematic view of an outer distribution pipe in FIG. 1.

FIG. 6 is a schematic view of a heat exchanger according to one or more embodiments.

FIG. 7 is an enlarged view of portion B in FIG. 6.

FIG. 8 is a schematic view of an inner distribution pipe in FIG. 6.

FIG. 9 is a cross-sectional view of an outer distribution pipe in FIG. 6.

FIG. 10 is a schematic view of an outer distribution pipe in FIG. 6.

Reference signs are as follows: 1000 represents a heat exchanger; 100 represents a refrigerant distribution device; 10 represents an inner distribution pipe; 11/A/B represents a hole unit; 111/a1/a2/a3/b1/b2/b3 represents an inner distribution hole; 20 represents an outer distribution pipe; 21 represents an outer distribution hole; 200 represents a collecting pipe; and 300 represents a heat exchange pipe.

DETAILED DESCRIPTION

The technical scheme in the embodiment of this application will be described clearly and completely with the attached drawings. Obviously, the described embodiment is only a part of the embodiment of this application, not the whole embodiment. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of this application.

It should be noted that when a component is considered to be “mounted” on another component, it can be directly on the other component or there can be a component in the middle. When a component is considered to be “set on” another component, it can be directly set on another component or there may be intervening components at the same time. When a component is considered to be “fixed” to another component, it can be directly fixed to another component or there may be intervening components at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used herein in the specification of this application is only for the purpose of describing specific embodiments, and is not intended to limit this application. As used herein, the term “or/and” includes any and all combinations of one or more related listed items.

In order to avoid a problem of uneven distribution of refrigerant, a refrigerant distribution device is generally installed in a collecting pipe of a heat exchanger for distributing refrigerant in the collecting pipe of the heat exchanger. However, in the related art, the refrigerant distribution device in the heat exchanger has a fixed refrigerant distribution scheme, and a refrigerant flow rate of the refrigerant distribution device is also fixed. Due to a complexity of two-phase refrigerant distribution, it is difficult for the refrigerant distribution device in the related art to realize multiple distribution schemes. If it is necessary to adjust refrigerant distribution scheme or refrigerant distribution flow rate, only another refrigerant distribution device can be replaced, which is time-consuming and laborious, so it is impossible to quickly adjust the refrigerant distribution flow rate in the related art, which greatly affects work efficiency.

Referring to FIG. 1 to FIG. 10, the present disclosure provides a refrigerant distribution device 100. The refrigerant distribution device 100 includes an inner distribution pipe 10 and an outer distribution pipe 20. The outer distribution pipe 20 is sleeved outside the inner distribution pipe 10. The inner distribution pipe 10 is provided with a plurality of hole units 11, and each of the plurality of hole units 11 includes a plurality of inner distribution holes 111. The plurality of inner distribution holes 111 are arranged at intervals. The outer distribution pipe 20 is provided with an outer distribution hole 21. By adjusting a relative position between the inner distribution pipe 10 and the outer distribution pipe 20, the plurality of inner distribution holes 111 of at least one of the plurality of hole units 11 are capable of being in communication with the outer distribution holes 21 correspondingly. A refrigerant is capable of successively flowing out of the plurality of inner distribution hole 111 and the outer distribution hole 21.

Advantages of the refrigerant distribution device 100 provided in the present disclosure are that by providing the plurality of the hole units 11 on the inner distribution pipe 10, it can meet requirements of various distribution flows, and it can have a wide application. By adjusting the relative position between the inner distribution pipe 10 and the outer distribution pipe 20, the inner distribution hole 111 can be adjusted to correspond to the outer distribution hole 21, and the required inner distribution hole 111 can be flexibly selected, so that the inner distribution pipe 10 does not need to be replaced, and working efficiency is improved. Moreover, the refrigerant distribution device 100 provided by the present disclosure completes an adjustment and selection of the types of the inner distribution hole 111 in the hole unit 11 without adding other structures, and has a simple structure and cost is reduced.

Referring to FIG. 3, FIG. 4, FIG. 8, and FIG. 9, it should be noted that each of plurality of hole units 11 includes a plurality of inner distribution holes 111. For example, referring to FIG. 3 and FIG. 4, each of the hole unit A includes an inner distribution hole a1 and an inner distribution hole a2. Referring to FIG. 8 and FIG. 9, the hole unit A includes the inner distribution hole a1, the inner distribution hole a2, the inner distribution hole a3, etc. The number of the inner distribution holes 111 in each hole unit 11 is not limited.

Referring to FIG. 3 and FIG. 4 or FIG. 8 and FIG. 9, in an embodiment, the plurality of the inner distribution holes 111 in each of the plurality of hole units 11 are arranged at intervals along an axis of the inner distribution pipe 10. In order to adjust the relative position between the inner distribution pipe 10 and the outer distribution pipe 20, the inner distribution hole 111 is capable of being in communication with the outer distribution hole 21 correspondingly, so that the inner distribution pipe 10 is in communication with the collecting pipe 200 through the inner distribution hole 111 and the outer distribution hole 21, therefore, the refrigerant in the inner distribution pipe 10 is diverted from the inner distribution hole 111 and the outer distribution hole 21 to the collecting pipe 200 in turn. Of course, in other embodiments, an arrangement of the plurality of inner distribution holes 111 in each of the plurality of hole units 11 is not limited to the above or shown in the figure.

Furthermore, referring to FIG. 3, a size of each of the plurality of inner distribution holes 111 in each of the plurality of hole units 11 is the same. The plurality of the distribution holes 111 are disposed on the inner distribution pipe 10, and the same size of each of the plurality of inner distribution holes 111 can ensure an uniform distribution of refrigerants everywhere on the inner distribution pipe 10. In addition, when estimating a required refrigerant flow rate, the size of each of the plurality of inner distribution holes 111 is the same, which is convenient for calculating an amount of refrigerant distribution, so as to adjust the relative position between the inner distribution pipe 10 and the outer distribution pipe 20, and improve adjustment efficiency. In other embodiments, a size of each of the plurality of inner distribution holes 111 in each of the plurality hole units 11 may also be vary, resulting in different refrigerant flow rates from different locations on the inner distribution pipe 10, thereby enhancing the anti-disturbance level of the refrigerant in the collecting pipe 200.

Referring to FIG. 3, in an embodiment, a distance between adjacent two of the plurality of distribution holes 111 in each of the plurality of hole units 11 is the same, so that the plurality of inner distribution holes 111 are arranged regularly, thereby facilitating a distribution of the plurality of inner distribution holes 111 in the plurality of hole units 11. Of course, in other embodiments, the distance between adjacent two of the plurality of inner distribution holes 111 in each of the plurality of hole units 11 may also be different.

Referring to FIG. 1 to FIG. 4, the plurality of hole units 11 are arranged at intervals along an axis of the inner distribution pipe 10. By adjusting a length of the inner distribution pipe 10 extending into the outer distribution pipe 20, the plurality of inner distribution holes 111 of at least one of the plurality of hole units 11 are capable of being in communication with the outer distribution hole 21 correspondingly. For example, referring to FIG. 4, the plurality of hole units 11 are disposed on the inner distribution pipe 10, which are denoted as a hole unit A, a hole unit B, etc. Before adjustment, the inner distribution hole a1 and the inner distribution hole a2 of the hole unit A correspond to the outer distribution hole 21. When moving the inner distribution pipe 10, an inner distribution hole b1 and an inner distribution hole b2 of the hole unit B can be made to correspond to the outer distribution hole 21, while the inner distribution hole a1 and the inner distribution hole a2 of the hole unit A are blocked by an inner wall of the outer distribution pipe 20, and the refrigerant in the inner distribution pipe 10 is in a high-pressure state. Therefore, the refrigerant in high-pressure state cannot flow out from the inner distribution hole a1 and the inner distribution hole a2 of the hole unit A, but can flow out from the inner distribution hole b1 and the inner distribution hole b2 of the hole unit B corresponding to the outer distribution hole 21, thus realizing a replacement of the plurality of the hole units 11. Of course, the plurality of hole units 11 are not limited to the above. For example, in the embodiment shown in FIG. 6 to FIG. 9, the plurality of hole units 11 are arranged along a circumferential direction of the inner distribution pipe 10. For example, the hole unit A, the hole unit B, a hole unit C, and a hole unit D are arranged along the circumferential direction of the inner distribution pipe 10, or other arrangement schemes can be adopted.

Specifically, in the embodiment shown in FIG. 6 to FIG. 9, the plurality of hole units 11 are arranged along a circumferential direction of the inner distribution pipe 10. By adjusting a rotation angle of the inner distribution pipe 10 in the circumferential direction, the plurality of inner distribution holes 111 of at least one of the plurality of hole units 11 can correspond to the outer distribution hole 21, and further adjusting the flow rate of the refrigerant flowing out of the inner distribution pipe 10. Of course, in other embodiments, arrangement of the plurality of hole units 11 are not limited to the embodiments shown in FIG. 1 to FIG. 4 and FIG. 6 to FIG. 9, and may be other.

Referring to FIG. 3 and FIG. 4, a distance between adjacent two of the plurality of hole units 11 is the same. Within the hole unit A, the distance between an inner distribution hole a1 and another adjacent inner distribution hole a2 is defined as L_a1, the distance between the inner distribution hole a2 and another adjacent inner distribution hole a3 is defined as L_a2. In the hole unit B, the distance between an inner distribution hole b1 and another adjacent inner distribution hole b2 is defined as L_b1, and the distance between the inner distribution hole b2 and another adjacent inner distribution hole b3 is defined as L_b2, “the distance between the hole unit A and the hole unit B is equal” means that the distance L_a1 between the inner distribution hole a1 and the inner distribution hole a2 and the distance L_b1 between adjacent the inner distribution hole b1 and the inner distribution hole b2 are equal, the distance L_a2 between the inner distribution hole a2 and the inner distribution hole a3 and the distance L_b2 between the inner distribution hole b2 and the inner distribution hole b3 are equal. Alternatively, for example, in the embodiment shown in FIG. 8 and FIG. 9, a plurality of the hole units 11 are arranged along a circumferential direction of the inner distribution pipe 10, and a plurality of inner distribution holes 111 in each hole unit 11 are arranged along an axis of the inner distribution pipe 10, “the distance between adjacent two of the plurality of the hole units 11 is the same” means that the corresponding distance between the inner distribution hole a1 and the inner distribution hole b1 is the same. It can also be understood that in this embodiment, the plurality of the hole units 11 are uniformly distributed along the circumferential direction of the inner distribution pipe 10, so that the distance between adjacent two of the plurality of hole units 11 is the same. Of course, in other embodiments, there are various schemes for the arrangement and distance between the hole units 11, and the distance between adjacent two of the hole units 11 can also be different, which is not limited to the above layout scheme.

Referring to FIG. 1, FIG. 2 and FIG. 5, the outer distribution pipe 20 is provided with a plurality of outer distribution holes 21, and the plurality of outer distribution holes 21 are arranged at intervals along an axis of the outer distribution pipe 20. In this way, the plurality of the outer distribution holes 21 correspond to the plurality of the inter distribution holes 111 in each of the plurality of hole units 11, respectively. By adjusting the relative positions between the inner distribution pipe 10 and the outer distribution pipe 20, so that the plurality of the inner distribution holes 111 in at least one of the plurality of hole units 11 correspond to the plurality of outer distribution holes 21 one by one. Of course, it is also possible that the plurality of inner distribution holes 111 in two or more kinds of hole units 11 correspond to the plurality of outer distribution holes 21. For example, the inner distribution hole a1 in the hole unit A and the inner distribution hole b1 in the hole unit B correspond to the outer distribution hole 21 at the same time, so as to increase the flow rate of the refrigerant distributed by the outer distribution hole 21. Of course, in other embodiments, the arrangement scheme of the inner distribution holes 111 is not limited to the above, and it can be adjusted according to the arrangement of the inner distribution holes 111.

In an embodiment, referring to FIG. 1, FIG. 2 and FIG. 5, the outer distribution hole 21 is in a circular shape. Of course, in order to adapt the arrangement of the plurality of inner distribution holes 111 corresponding to one outer distribution hole 21, the outer distribution hole 21 can also be in an elongated shape (referring to FIG. 10), the plurality of inner distribution holes 111 of at least one of the plurality of hole units 11 are capable of being in communication with the elongated-shaped outer distribution hole 21 correspondingly. In other embodiments, it does not limit the shape of the outer distribution pipe 20.

Referring to FIG. 6, FIG. 7 and FIG. 10, the outer distribution pipe 20 is provided with one outer distribution hole 21, the outer distribution hole 21 is in elongated shape, and the outer distribution hole 21 extends along an axis of the outer distribution pipe 20. In this way, when the inner distribution pipe 10 rotates at a certain angle relative to the outer distribution pipe 20, the plurality of the inner distribution holes 111 in at least one of the plurality of hole units 11 correspond to elongated holes (i.e. the outer distribution hole 21), it can be ensured that the plurality of the inner distribution holes 111 are in communication with the collecting pipe 200 at the same time and distribute the refrigerant. In other embodiments, the number of elongated holes (i.e. the outer distribution holes 21) can also be multiple, which is not limited here.

In an embodiments, the plurality of the outer distribution holes 21 correspond to the plurality of the inner distribution holes 111 in each of the plurality of hole unit 11, and an area of each outer distribution hole 21 is less than an area of each corresponding inner distribution hole 111 in each of the plurality of hole units 11, so that the plurality of the outer distribution holes 21 have a certain throttling effect on the refrigerant, the flow rate of the refrigerant is increased, and the refrigerant distribution efficiency is improved.

In an embodiments, the plurality of the inner distribution holes 111 in at least one of the plurality of hole unit 11 are in communication with the outer distribution holes 21 correspondingly. The plurality of the inner distribution holes 111 in each of the plurality of hole unit 11 are arranged at intervals along an axis of the inner distribution pipe 10. An outer wall of the inner distribution pipe 10 is tangentially positioned relative to an inner wall of the outer distribution pipe 20, allowing flexible adjustment for each of the plurality of hole unit 11 to be in communication with the outer distribution orifice 21 to distribute a refrigerant.

Referring to FIG. 1 and FIG. 6, the present disclosure further provides a heat exchange 1000 including a collecting pipe 200, a plurality of heat exchange pipes 300 and the above refrigerant distribution device 100. The collecting pipe 200 is sleeved outside the outer distribution pipe 20, and the outer distribution pipe 20 is in communication with the collecting pipe 200 by the outer distribution hole 21. The plurality of heat exchange pipes 300 extend along an axis of the collecting pipe 200 and are arranged at intervals, and the plurality of heat exchange pipes 300 are in communication with the collecting pipe 200.

In addition, it should be noted that the words “first” and “second” are used to define parts only for the convenience of distinguishing the corresponding parts. Unless otherwise stated, the above words have no special meaning, so they cannot be understood as limiting the scope of protection of the present disclosure.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features are described in the embodiments. However, as long as there is no contradiction in the combination of these technical features, the combinations should be considered as in the scope of the present disclosure.

One of ordinary skill in the art should recognize that the above embodiments are used only to illustrate the present disclosure and are not used to limit the present disclosure, and that appropriate variations and improvements to the above embodiments fall within the protection scope of the present disclosure so long as they are made without departing from the substantial spirit of the present disclosure.

Claims

1. A refrigerant distribution device, comprising an inner distribution pipe and an outer distribution pipe, wherein the outer distribution pipe is sleeved outside the inner distribution pipe;

wherein the inner distribution pipe is provided with a plurality of hole units, and each of the plurality of hole units comprises a plurality of inner distribution holes, the plurality of inner distribution holes are arranged at intervals; the outer distribution pipe is provided with an outer distribution hole; and

by adjusting a relative position between the inner distribution pipe and the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

2. The refrigerant distribution device of claim 1, wherein the plurality of inner distribution holes of each of the plurality of hole units are arranged at intervals along an axis of the inner distribution pipe.

3. The refrigerant distribution device of claim 1, wherein the plurality of hole units are arranged along an axis of the inner distribution pipe, and by adjusting a length of the inner distribution pipe extending into the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

4. The refrigerant distribution device of claim 1, wherein the plurality of hole units are arranged along a circumferential direction of the inner distribution pipe, and by adjusting a rotation angle of the inner distribution pipe along the circumferential direction of the inner distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

5. The refrigerant distribution device of claim 3, wherein the outer distribution pipe is provided with a plurality of outer distribution holes, and the plurality of outer distribution holes are arranged at intervals along an axis of the outer distribution pipe.

6. The refrigerant distribution device of claim 4, wherein the outer distribution pipe is provided with a plurality of outer distribution holes, each of the plurality of outer distribution holes is in a circular shape, and the plurality of outer distribution holes are arranged at intervals along an axis of the outer distribution pipe.

7. The refrigerant distribution device of claim 4, wherein the outer distribution pipe is provided with one outer distribution hole, the outer distribution hole is in an elongated shape and the outer distribution hole extends along an axis of the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the elongated-shaped outer distribution hole correspondingly.

8. The refrigerant distribution device of claim 1, wherein a size of each of the plurality of inner distribution holes in each of the plurality of hole units is the same.

9. The refrigerant distribution device of claim 1, wherein a distance between adjacent two of the plurality of inner distribution holes in each of the plurality of hole units is the same.

10. The refrigerant distribution device of claim 1, wherein a distance between adjacent two of the plurality of hole units is the same.

11. A heat exchanger, comprising a collecting pipe, a plurality of heat exchange pipes and the refrigerant distribution device of claim 1;

wherein the collecting pipe is sleeved outside the outer distribution pipe, and the outer distribution pipe is in communication with the collecting pipe by the outer distribution hole; the plurality of heat exchange pipes extend along an axis of the collecting pipe and are arranged at intervals, and the plurality of heat exchange pipes are in communication with the collecting pipe.

12. The heat exchanger of claim 11, wherein the plurality of inner distribution holes of each of the plurality of hole units are arranged at intervals along an axis of the inner distribution pipe.

13. The heat exchanger of claim 11, wherein the plurality of hole units are arranged along an axis of the inner distribution pipe, and by adjusting a length of the inner distribution pipe extending into the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

14. The heat exchanger of claim 11, wherein the plurality of hole units are arranged along a circumferential direction of the inner distribution pipe, and by adjusting a rotation angle of the inner distribution pipe along the circumferential direction of the inner distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the outer distribution hole correspondingly.

15. The heat exchanger of claim 13, wherein the outer distribution pipe is provided with a plurality of outer distribution holes, and the plurality of outer distribution holes are arranged at intervals along an axis of the outer distribution pipe.

16. The heat exchanger of claim 14, wherein the outer distribution pipe is provided with a plurality of outer distribution holes, each of the plurality of outer distribution holes is in a circular shape, and the plurality of outer distribution holes are arranged at intervals along an axis of the outer distribution pipe.

17. The heat exchanger of claim 14, wherein the outer distribution pipe is provided with one outer distribution hole, the outer distribution hole is in an elongated shape and the outer distribution hole extends along an axis of the outer distribution pipe, the plurality of inner distribution holes of at least one of the plurality of hole units are capable of being in communication with the elongated-shaped outer distribution hole correspondingly.

18. The heat exchanger of claim 11, wherein a size of each of the plurality of inner distribution holes in each of the plurality of hole units is the same.

19. The heat exchanger of claim 11, wherein a distance between adjacent two of the plurality of inner distribution holes in each of the plurality of hole units is the same.

20. The heat exchanger of claim 11, wherein a distance between adjacent two of the plurality of hole units is the same.