INDOOR UNIT AND AIR CONDITIONER
An indoor unit is equipped with a housing having an inlet opening and an outlet opening, a propeller fan disposed in an air passage interconnecting the inlet opening and the outlet opening, a heat exchanger disposed downstream from the propeller fan, and a lateral airflow direction changing plate that is disposed downstream from the heat exchanger and that changes an airflow direction laterally. The heat exchanger is a fin-and-tube type heat exchanger equipped with a plurality of fins and a plurality of heat transfer tubes passing through the fins. The lateral airflow direction plate has slits in an airflow downstream region that is downstream from the heat transfer tubes.
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The present disclosure relates to an indoor unit and an air conditioner.
BACKGROUND ARTAn air conditioner is equipped with airflow direction changing plates for changing direction of blown air flowing out from an indoor unit. For example, in Patent Literature 1, a lateral airflow direction changing plate is proposed that has multiple slits formed thinly in a direction of airflow in an intermediate region and excluding an upstream end region and an airflow downstream end region of airflow.
CITATION LIST Patent LiteraturePatent Literature 1: Unexamined Japanese Patent Application Kokai Publication No. 2008-80839
SUMMARY OF INVENTION Technical ProblemThe lateral airflow direction changing plate is sometimes disposed in the downstream vicinity of a fin-and-tube type heat exchanger. In this case, the air reaches the lateral airflow direction changing plate in a state in which both a temperature distribution and an absolute humidity distribution of the air remain non-uniform, and such operation suffers from the occurrence of condensation on the lateral airflow direction changing plate.
In order to solve such a problem, an object of the present disclosure is to provide an indoor unit and an air conditioner that are equipped with an airflow direction changing plate on which condensation tends not to occur.
Solution to ProblemIn order to attain the aforementioned objective, an indoor unit according to the present disclosure includes:
an air blower disposed in an air passage;
a heat exchanger disposed downstream from the air blower and including a plurality of fins and a heat transfer tube passing through the fins; and
an airflow direction changing plate to change an airflow direction, the airflow direction changing plate being disposed downstream from the heat exchanger and having an opening portion in an airflow downstream region that is downstream from the heat transfer tube.
ADVANTAGEOUS EFFECTS OF INVENTIONAccording to the present disclosure, the airflow direction changing plate has an opening portion in the airflow downstream region from the heat transfer tube. Therefore, condensation on the airflow direction changing plate tends not to occur.
An indoor unit 100 according to Embodiment 1 of the present disclosure is described with reference to the drawings. Each of the drawings is schematic, and thus components are not limited to the shapes and sizes illustrated in the drawings. In the drawings, components that are the same or equivalent are assigned the same reference sign. The present disclosure relates to suppression of condensation, and thus operation during cooling is assumed and described unless otherwise noted.
The indoor unit 100 according to Embodiment 1, as illustrated in
As illustrated in
In an air passage interconnecting the inlet opening 2 and the outlet opening 3 are arranged: a pushing-in type propeller fan 4 for sucking in indoor air from the inlet opening 2 and sending out the air to a heat exchanger side, a heat exchanger 50 positioned in an airflow downstream direction that is downstream from the propeller fan 4 and positioned in an airflow upstream direction that is upstream from the outlet opening 3, and a drain pan 6, disposed below the heat exchanger 50, for receiving and discharging water that is generated due to condensation by the heat exchanger 50. Further, in the present disclosure, “airflow” is taken to mean the flow of air produced by the propeller fan 4. The propeller fan 4 is one example of an air blower.
The heat exchanger 50 heats or cools the air blown by the propeller fan 4. Specifically, the heat exchanger 50 includes a forward-tilted portion 50a that is tilted forward, a rearward-tilted portion 50b that is tilted rearward and positioned opposingly behind the forward-tilted portion 50a, a forward-tilted portion 50c that is tilted forward and positioned opposingly behind the rearward-tilted portion 50b, and a rearward-tilted portion 50d that is tilted rearward and positioned opposingly behind the forward-tilted portion 50c; and these components are arranged in a W-shaped configuration.
The forward-tilted portion 50a, the rearward-tilted portion 50b, the forward-tilted portion 50c, and the rearward-tilted portion 50d each include flat plate-like fins 51 arranged in a row and heat transfer tubes 52 passing through the fins 51 to form a fin-and-tube type heat exchanger unit. By flow of a heat transfer medium within the heat transfer tubes 52, by allowing the cold temperature of the heat transfer medium during cooling to transfer heat to the fins 51 that have a large surface area, and by use of the fins as heat exchange plates, the fin-and-tube type heat exchanger efficiency performs cooling of the air. The fins 51 are arranged parallel to a direction of flow of air so as not to impede the flow of air, and the heat transfer tubes 52 are arranged extending in a direction orthogonal to the direction of flow of air.
In the outlet opening 3 of the housing 1, a frontward positioned front-side vertical airflow direction changing plate 7 and a rearward positioned rear-side vertical airflow direction changing plate 8 are arranged, and each of these plates can change vertically the airflow direction of the air.
The bottom-side lateral airflow direction changing plate 9 is arranged below the front-side vertical airflow direction changing plate 7. The bottom-side lateral airflow direction changing plate 9 can change the lateral airflow direction of the air subjected to heat exchange by the rearward-tilted portion 50b, the forward-tilted portion 50c, and the rearward-tilted portion 50d. Moreover, multiple top-side lateral airflow direction changing plates 20 are arranged downstream from the forward-tilted portion 50a. The top-side lateral airflow direction changing plates 20 can laterally change the airflow direction of the air subject to heat exchange by the forward-tilted portion 50a.
As illustrated in
Each of the top-side lateral airflow direction changing plates 20 is connected to a single connector 12 via a respective fixing implement 14, so that all of the top-side lateral airflow direction changing plates 20 are interlocked with the connector 12 to enable simultaneous change of direction. Specifically, upon movement of the connector 12 in the rightward direction of
As illustrated in
Although operation of the indoor unit 100 is performed by use of a device such as an operating remote controller to start an operation, stop an operation, and set parameters such as temperature, air flow rate, and airflow direction, the control system technology is the same as that of a conventional control system. Moreover, the technology of the outdoor unit 102 that is used for heat exchange is the same as that of a conventional outdoor unit.
As illustrated in
The expression “airflow downstream from the heat transfer tube 52” means the region at the downstream side through which air flows at the periphery of the heat transfer tube 52. Due to the presence of multiple heat transfer tubes 52, multiple airflow downstreams exist. The term “slit” means an opening having a long-narrow shape. The term “opening portion” means a hole, notch, or the like passing from one surface to the other surface of the top-side lateral airflow direction changing plate 20. The expression “opening having gradually decreasing width” means that a fraction of an opening surface area of the openings 21a and 21b per a certain unit surface area of the top-side lateral airflow direction changing plate 20 gradually decreases.
For example, as illustrated in
For description of operation of such slits 21a and 21b, a mechanism is described by which condensation occurs in an example of a lateral airflow direction changing plate 40 of the conventional technology that is not equipped with the slits 21a and 21b with reference to
In
As illustrated in
In
As may be understood from
Therefore, in the present disclosure as illustrated in
Moreover, as illustrated in
Due to configuration in this manner, the risk of the occurrence of condensation on the top-side lateral airflow direction changing plate 20 can be decreased, and even if condensation occurs, a decrease in the condensation amount can be achieved.
According to Embodiment 1 as described above, the top-side lateral airflow direction changing plate 20 has the slits 21a and 21b in which slit width gradually decreases from the air flow upstream to the downstream, of the rear portion of the heat transfer tube 52, in the region contacted by air of relatively low temperature in comparison to the periphery. Due to such configuration, an indoor unit 100 can be provided for which condensation tends not to occur even when the top-side lateral airflow direction changing plate 20 is positioned in the downstream vicinity of the fin-and-tube type heat exchanger 50.
Although the shapes of the slits 21a and 21b are determined so as to match the distribution of air temperature as described above, in the case in which the shape of the distribution of air temperature differs in accordance with the position of the top-side lateral airflow direction changing plate 20, the shapes of the slits 21a and 21b may differ among the top-side lateral airflow direction changing plates 20. Moreover, although there are two slits 21a and 21b in Embodiment 1, the number of the slits may be freely determined to match the distribution state of the air temperature.
Moreover, although the bottom-side lateral airflow direction changing plate 9 in Embodiment 1 is disposed at the downstream side of the heat transfer tube 52 of the rearward-tilted portion 50b, the forward-tilted portion 50c, and the rearward-tilted portion 50d, the distance from the heat transfer tube 52 is great, and relatively low temperature air and warm air may intermix, and thus condensation tends not to be locally generated. Although the slits are thus not arranged in the bottom-side lateral airflow direction changing plate 9, in the case in which a distribution of air temperature arises due to the arrangement relationship between the heat transfer tubes 52 and the bottom-side lateral airflow direction changing plate 9 such that condensation easily occurs, slits can be arranged also in the bottom-side lateral airflow direction changing plate 9.
Embodiment 2Embodiment 2 is an example of arrangement of, rather than the slits 21a and 21b of Embodiment 1, notches 22a and 22b having a shape in which the upstream end of the slit opens. The notches 22a and 22b are examples of openings similar to the slits 21a and 21b.
As illustrated in
Due to configuration in this manner, cooling of the top-side lateral airflow direction changing plate 20a during cooling operation decreases, and the heat conduction within the top-side lateral airflow direction changing plate 20a can be suppressed. In comparison to the conventional technology, the risk of condensation can thus be decreased, and even if condensation occurs, a decrease in the condensation amount can be achieved.
Further, in a manner similar to that of Embodiment 1, width of the notches 22a and 22b gradually decreases from the air flow upstream side to the downstream side, and thus while decreasing the risk of condensation, this has the effect of suppressing the lowering of airflow direction change performance.
Moreover, although the upstream end of the top-side lateral airflow direction changing plate 20a is the location at which condensation tends to occur due to the air temperature distribution being the most equalized, notching of the upstream end has the effect of decreasing the risk of condensation.
Embodiment 3Embodiment 3 is an example of an arrangement of, rather than the slits 21a and 21b of Embodiment 1, multiple through holes 23 having different diameters in the airflow downstream regions of the heat transfer tubes 52. The through holes 23 are examples of openings.
As illustrated in
Due to configuration in this manner, cooling of the top-side lateral airflow direction changing plate 20b decreases during the cooling operation, and heat conduction within the top-side lateral airflow direction changing plate 20b can be suppressed. Thus, the risk of condensation can be decreased in comparison to the conventional technology, and even if condensation occurs, the amount of condensation can be decreased.
Furthermore, the opening fraction of the through holes 23 gradually decreases, in a manner similar to that of Embodiment 1, from the airflow upstream to the downstream, and thus while decreasing the risk of condensation, this has the effect of suppressing the lowering of the airflow direction change performance.
Embodiment 4Embodiment 4 is an example of arrangement of, in place of the slits 21a and 21b of Embodiment 1, multiple circular through holes 24, each of the same diameter, in the airflow downstream region from the heat transfer tubes 52.
As illustrated in
Due to configuration in this manner, the cooling of the top-side lateral airflow direction changing plate 20c during the cooling operation may decrease, and heat conduction within the top-side lateral airflow direction changing plate 20c can be suppressed. The risk of condensation can thus be decreased in comparison to the conventional technology, and even if condensation occurs, a decrease in the condensation amount can be achieved.
Furthermore, the distribution fraction of the number of the through holes 24 gradually decreases from the airflow stream to the downstream, and thus in a manner similar to that of Embodiment 1, while decreasing the risk of condensation, this has the effect of suppressing the lowering of the airflow direction change performance.
Embodiment 5Embodiment 5 is an example in which through holes 25 are disposed over an entire surface rather than as the slits 21a and 21b of Embodiment 1.
As illustrated in
Due to configuration in this manner, even when the air temperature distribution and the absolute humidity distribution are irregular after passage of air through the heat exchanger 50, an effect of preventing condensation on the top-side lateral airflow direction changing plate 20d can be achieved. That is, even when the flow of cooled air changes irregularly, the possibility of condensation on the top-side lateral airflow direction changing plate 20d can be decreased. Further, due to making the opening density of the through holes 25 uniform over the entire top-side lateral airflow direction changing plate 20d, whatever the air temperature distribution and the absolute humidity distribution after passage of air through the heat exchanger 50, such configuration enables the achievement of an effect that is prevention of condensation on the top-side lateral airflow direction changing plate 20d.
Modified Example 1Although examples are indicated in which the openings are formed in the lateral airflow direction changing plate in the embodiments, the direction of change of the airflow is not limited to any particular direction. The airflow direction changing plate of the present disclosure may change airflow in the lateral direction, or may change airflow in the forward-rearward direction. The present disclosure is applicable as long as an airflow direction changing plate is disposed downstream from the fin-and-tube type heat exchanger.
Modified Example 2Although an edge surface shape of the opening portion is not particularly limited, the opening portion preferably has a shape that does not make the flow of air passing through the opening portion unsteady. Although the opening portion may have a right-angled end surface in the surface of the top-side lateral airflow direction changing plate 20 as illustrated in
The propeller fan is used as the air blower in Embodiments 1 to 5. The type of the air blower is not limited to this type. For example, a crossflow fan may be used. Moreover, the propeller fan may be an axial flow propeller fan or a diagonal flow propeller fan. Alternatively, a centrifugal fan may be used.
The foregoing describes some example embodiments for explanatory purposes. Although the foregoing discussion has presented specific embodiments, persons skilled in the art will recognize that changes may be made in form and detail without departing from the broader spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. This detailed description, therefore, is not to be taken in a limiting sense, and the scope of the invention is defined only by the included claims, along with the full range of equivalents to which such claims are entitled.
INDUSTRIAL APPLICABILITYThe present disclosure can be used with advantage for an indoor unit of an air conditioner.
REFERENCE SIGNS LIST
- 1 Housing
- 2 Inlet opening
- 3
Outlet opening
- 4 Propeller fan
- 6 Drain pan
- 7 Front-side vertical airflow direction changing plate
- 8 Rear-side vertical airflow direction changing plate
- 9 Bottom-side lateral airflow direction changing plate
- 10 Fixing part
- 12 Connector
- 14 Fixing implement
- 15 Attaching part
- 16 Supporting part
- 20, 20a, 20b, 20c, 20d Top-side lateral airflow direction changing plate
- 21a, 21b Slit
- 22a, 22b Notch
- 23, 24, 25 Through hole
- 28a, 28b, 28c, 28d Virtual rectangle
- 31 Dust collection filter
- 32 Filter-fixing implement
- 40 Lateral airflow direction changing plate
- 41 Intermediate temperature region
- 42 High temperature region
- 43 Low temperature region
- 44 Airflow
- 45 Flowline
- 46 Airflow
- 47 Condensation region
- 50 Heat exchanger
- 50a Forward-tilted portion
- 50b Rearward-tilted portion
- 50c Forward-tilted portion
- 50d Rearward-tilted portion
- 51 Fin
- 52 Heat transfer tube
- 100 Indoor unit
- 101 Refrigerant tube
- 102 Outdoor unit
- 110 Air conditioner
Claims
1. An indoor unit comprising:
- an air blower disposed in an air passage;
- a heat exchanger disposed downstream from the air blower and including a plurality of fins and a heat transfer tube passing through the fins; and
- an airflow direction changing plate to change an airflow direction, the airflow direction changing plate being disposed downstream from the heat exchanger and having an opening portion in an airflow downstream region that is downstream from the heat transfer tube;
- wherein an opening fraction of the opening portion gradually decreases from an airflow upstream to an airflow downstream.
2. (canceled)
3. An indoor unit comprising:
- an air blower disposed in an air passage;
- a heat exchanger disposed downstream from the air blower and including a plurality of fins and a heat transfer tube passing through the fins; and
- an airflow direction changing plate to change airflow direction, the airflow direction changing plate being disposed downstream from the heat exchanger and having an opening portion in an airflow downstream region that is downstream from the heat transfer tube;
- wherein
- the opening portion includes a slit extending from
- an airflow upstream to an airflow downstream of the airflow direction changing plate, and
- an airflow upstream side of the slit has an opened notch shape.
4. (canceled)
5. The indoor unit according to claim 1, wherein the opening portion includes a plurality of through holes, each through hole having a diameter that gradually decreases from an airflow upstream to an airflow downstream of the airflow direction changing plate.
6. The indoor unit according to claim 1, wherein the opening portion is disposed in an entire region of the airflow direction changing plate and includes a plurality of through holes with an opening density that gradually decreases from an airflow upstream to an airflow downstream of the airflow direction changing plate.
7. (canceled)
8. The indoor unit according to claim 1, wherein the air blower includes a propeller fan.
9. An air conditioner comprising the indoor unit according to claim 1.
10. The indoor unit according to claim 1, wherein the opening portion includes a slit having a width that gradually decreases from an airflow upstream to an airflow downstream of the airflow direction changing plate.
11. The indoor unit according to claim 1, wherein the opening portion includes a plurality of through holes for which a distribution count gradually decreases from an airflow upstream to an airflow downstream of the airflow direction changing plate.
12. The indoor unit according to claim 5, wherein the opening portion includes a plurality of through holes for which a distribution count gradually decreases from an airflow upstream to an airflow downstream of the airflow direction changing plate.
Type: Application
Filed: Apr 11, 2017
Publication Date: May 6, 2021
Applicant: Mitsubishi Electric Corporation (Chiyoda-ku, Tokyo)
Inventors: Tadakiyo SEKI (Tokyo), Takashi KOBAYASHI (Tokyo), Hajime IKEDA (Tokyo), Seiji HIRAKAWA (Tokyo), Masayuki OISHI (Tokyo), Akinori SAKABE (Tokyo)
Application Number: 16/488,611