Positioning structure and method for assembling compressor

Abstract

A positioning structure and a method are used to assemble a scroll compressor for outputting high-pressure fluid. The casing, supporting stage and the upper scroll are arranged and positioned by using pin engaged with pin hole. The lower scroll is provided on a baffle face of the supporting stage. A transmission shaft is pivotally arranged on the supporting stage with one end connected to a rotation power source. The transmission shaft comprises a crank at top thereof and is connected to bottom of the lower scroll such that the axis of the upper scroll is coaxial with the transmission shaft of the lower scroll. Moreover, the upper scroll and the lower scroll have relative acentric rotation to generate high-pressure fluid.

Description

BACKGROUND OF THE INVENTION

The present invention relates to a positioning structure and a method for assembling compressor, and more particularly to a positioning structure for achieving the coaxial arrangement of compressor components and a method for assembling compressor.

The positioning device and method for assembling a prior art scroll compressor demand to assemble the elements of the scroll compressor in coaxial manner. However, in this kind of scroll compressor, the axis of the upper scroll and the transmission axis of the lower scroll should be coaxial. Therefore, the inner diameter of compressor casing, the outer diameters of the upper scroll and the lower scroll should be matched within certain tolerance for coaxial positioning. However, this requires precise size match for those elements. The work area is large and the cost is increased.

SUMMARY OF THE INVENTION

The present invention provides a positioning structure for achieving the coaxial arrangement of compressor components and a method for assembling the compressor.

Accordingly, the positioning structure of the present invention includes a casing, a supporting stage in the casing, an upper scroll and a lower scroll being fixed to the supporting stage to achieve generation of high-pressure fluid. A pin is extended from the supporting stage and a through pin hole is defined in the upper scroll and corresponding to the pin. The pin hole is engaged with the pin to assemble the upper scroll to the supporting stage. An axial hole is defined in the supporting stage and a transmission shaft on bottom of the lower scroll passes through the axial hole of he supporting stage and the axial hole of the lower shell for connecting to a motor. The motor drives the lower scroll to rotate while the axis of the upper scroll is coaxial with the transmission shaft of the lower scroll.

BRIEF DESCRIPTION OF DRAWING

The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself however may be best understood by reference to the following detailed description of the invention, which describes certain exemplary embodiments of the invention, taken in conjunction with the accompanying drawings in which:

FIG. 1 shows a sectional view of the positioning structure of a compressor according to a preferred embodiment of the present invention.

FIG. 2 shows a sectional view of the positioning structure of compressor according to another preferred embodiment of the present invention.

FIG. 3 is a sectional view showing the pin used in the positioning structure of compressor according to the present invention.

FIG. 4 shows a flowchart of the assembling method for the compressor according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a sectional view of the positioning structure of a compressor according to a preferred embodiment of the present invention. The scroll compressor 10 comprises a casing 11 with a supporting stage 13 therein, an upper scroll 15, a lower scroll 17 and a transmission axis 19. The lower scroll 17 is placed on the supporting stage 13 and the transmission axis 19 is pivotally connected to the supporting stage 13 with one end connected to a rotation means. A crank 191 is formed on top of the transmission axis 19 and pivotally connected to a sleeve on bottom of the lower scroll 17. The crank 191 drives the lower scroll 17 to have acentric rotation with the upper scroll 15, thus producing high-pressure liquid.

The supporting stage 13 comprises an axial hole 131 and the casing 11 comprises a lower shell 111 with an axial hole 192. The supporting stage 13 is retained on the lower shell 111. The transmission axis 19 is pivotally connected to the axial hole 131 of the supporting stage 13 and the axial hole 192 of the lower shell 111 to determine a rotation axis thereof. One end of the transmission axis 19 is connected to a motor 193. The transmission axis 19 is driven by the motor 193 to rotate the lower scroll 17. The supporting stage 13 comprises a first pin hole 132 and the lower shell 111 comprises a second pin hole 112. A pin 20 passes through the first pin hole 132 and the second pin hole 112 to limit a related position between the axial hole 13 of the supporting stage 13 and the motor 193 on one end of the transmission axis 19, thus positioning the axis of the transmission axis 19.

The supporting stage 13 comprises at least two first pin holes 132 and the lower shell 111 comprises corresponding second pin holes 112. The pins 20 pass through the first pin holes 132 and the second pin holes 112 to limit three degree of freedom for the supporting stage 13 and the lower shell 111 on a plane, thus achieving better precision.

In above-mentioned assembling structure for the supporting stage 13 and the lower shell 111, only the first pin holes 132 of the supporting stage 13 and the second pin holes 112 of the lower shell and the pins 20 need machining and positioning with high precision. The supporting stage 13 and the lower shell 111 can be precisely assembled.

The upper scroll 15 is assembled in the casing 11 to form a liquid compression mechanism with the lower scroll 17. The upper scroll 15 comprises a third pin hole 153 used with a fourth pin hole 133 of the supporting stage 13. A pin 21 passes through the third pin hole 153 and the fourth pin hole 133 to limit a coaxial structure composed of the upper scroll 15 and the supporting stage 13 pivotally connected to the transmission axis 19.

The upper scroll 15 might comprise at least two third pin hole 153 and the supporting stage 13 also comprises corresponding fourth pin holes 133.

Similarly the upper scroll 15 might comprise at least two third pin hole 153 and the supporting stage 13 also comprise corresponding fourth pin holes 133. The corresponding pins 21 pass through the third pin hole 153 and the fourth pin holes 133 to limit three degree of freedom for the supporting stage 13 and the upper scroll 15 on a plane, thus achieving better precision.

The upper scroll 15 is assembled to the supporting stage 13 by passing the pins 21 through the third pin hole 153 and the fourth pin holes 133, thus assembling the upper scroll 15 to the casing 11. The pins 21 only limit the degree of freedom for the upper scroll 15 on a plane and do not limit the degree of freedom along a vertical direction.

In the above-mentioned casing 11 or supporting stage 13, at least portion thereof is made by casting such that portion of the casing 11 and the supporting stage 13 is made by casting. Moreover the casing 11 and the supporting stage 13 can also be integrally formed by casting.

FIG. 2 shows a sectional view of the positioning structure of compressor according to another preferred embodiment of the present invention.

With reference to FIG. 2, the positioning structure of compressor according to the present invention comprises a plurality of first pin holes 132 on the supporting stage 13, a plurality of second pin holes 112 on the lower shell 111 and a plurality of third pin holes 153 on the upper scroll 15. Those pin holes are corresponding to each other to form a plurality of through holes. A plurality of pins 22 passes through corresponding through holes such that the supporting stage 13 and the upper scroll 15 can be simultaneously assembled with the casing 11 and the upper scroll 15 is coaxial with the transmission axis 19.

FIG. 3 is a sectional view showing the pin used in the positioning structure of compressor according to the present invention.

With reference to FIG. 3, the pins include pin 20, pin 21 and pin 22. Taking the pin 21 as an example, the pin 21 comprises a rod-shaped body, flange 21a at top side thereof, and a thread 21b at bottom side thereof. The supporting stage 13 comprises a thread hole 134 for engaging the thread 21b such that the pin 21 is engaged with the thread hole 134 of the fourth pin holes 133, after passing the third pin holes 153 of the upper scroll 15. Moreover, the flange 21a provides upper limit for the position of the upper scroll 15.

FIG. 4 shows a flowchart of the assembling method for the compressor according to the present invention. This method is applied to a scroll compressor 10 and uses assembling structure for retaining the supporting stage 13 to the upper scroll 15 and the lower scroll 17 and for assembling the scroll compressor 10. The method comprises a step 100 for fixing the supporting stage 13 to a predetermined position of the casing 11 of the scroll compressor 10, which provides a reference for successive steps. In the step 200, the transmission axis 19 of the lower scroll 17 is inserted into the axial hole 131 of the supporting stage 13 and the axial hole 192 of the lower shell 111 and connected to a motor 193 for providing power. Therefore, the transmission axis 19 can be positioned by the axial hole 131 and the axial hole 192. In the step 300, corresponding pin 21 is inserted into the third pin holes 153 of the upper scroll 15 and the fourth pin holes 133 of the supporting stage 13 for clamping. Therefore, the upper scroll 15 and the transmission axis 19 can be clamped by above steps.

Moreover, the supporting stage 13 can be integrally formed with the casing 1 to enhance the positioning precision of the supporting stage 13 and prevent calibration problem after assembling.

Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.

Claims

1. A positioning structure for a compressor, the compressor comprising a casing for mounting a supporting stage, an upper scroll, a lower scroll and a transmission shaft, the transmission shaft pivotally connected to an axial hole of the supporting stage and an axial hole on bottom of the casing and having one end connected to a rotation power source and having another end connected to a bottom of the lower scroll for driving the upper scroll and the lower scroll to have relative acentric rotation and generating high-pressure fluid, the positioning structure being characterized in that

the supporting stage is fixed to a lower shell of the casing and the supporting stage comprises at least one pin hole, the upper scroll comprises at least one corresponding pin hole, a pin is inserted into the pin hole of the supporting stage and the pin hole of the upper scroll to limit a relative position between the upper scroll and the supporting stage.

2. The positioning structure for a compressor as in claim 1, wherein the pin is inserted into the pin hole of the supporting stage and the pin hole of the upper scroll to limit a radial degree of freedom for the upper scroll.

3. The positioning structure for a compressor as in claim 1, wherein at least part of the casing and the supporting stage is made by casting such that portion of the casing and the supporting stage is made by casting.

4. The positioning structure for a compressor as in claim 1, wherein the casing and the supporting stage are integrally formed.

5. The positioning structure for a compressor as in claim 1, wherein the pin comprises a rod-shaped body, a flange at top side thereof, and a thread at bottom side thereof, the thread passing through the pin hole of the supporting stage and the pin hole of the upper scroll such that the pin is retained to the pin hole of the supporting stage.

6. The positioning structure for a compressor as in claim 5, wherein the pin passes through the upper scroll and the supporting stage and selectively fixed to the casing and the supporting stage.

7. A positioning structure for a compressor, the compressor comprising a casing for mounting a supporting stage, an upper scroll, a lower scroll and a transmission shaft, the transmission shaft pivotally connected to an axial hole of the supporting stage and an axial hole on bottom of the casing and having one end connected to a rotation power source and having another end connected to a bottom of the lower scroll for driving the upper scroll and the lower scroll to have relative acentric rotation and generating high-pressure fluid, the positioning structure being characterized in that

the casing comprises a lower shell on bottom thereof and the lower shell comprises an axial hole, the supporting stage is fixed to the lower shell of the casing;

the supporting stage comprises at least one pin hole, the lower shell comprises at least one corresponding pin hole, a pin is inserted into the pin hole of the supporting stage and the pin hole of the lower shell to limit a relative position between the axial hole of the supporting stage, which is pivotally connected to the transmission axis, and the axial hole of the lower scroll, whereby an axis of the transmission axis can be positioned.

8. The positioning structure for a compressor as in claim 7, wherein the pin is inserted into the pin hole of the supporting stage and the pin hole of the casing to limit a radial degree of freedom for the supporting stage.

9. The positioning structure for a compressor as in claim 7, wherein at least part of the casing and the supporting stage is made by casting such that portion of the casing and the supporting stage is made by casting.

10. The positioning structure for a compressor as in claim 7, wherein the casing and the supporting stage are integrally formed.

11. The positioning structure for a compressor as in claim 7, wherein the pin comprises a rod-shaped body, a flange at top side thereof, and a thread at bottom side thereof, the thread passing through the pin hole of the supporting stage and the pin hole of the lower scroll such that the pin is retained to the pin hole of the lower scroll.

12. The positioning structure for a compressor as in claim 11, wherein the pin passes through the casing, and the supporting stage and selectively fixed to the casing and the supporting stage.

13. A method for assembling a compressor, the compressor comprising a casing, a supporting stage in the casing, an upper scroll and a lower scroll being fixed to the supporting stage to achieve generation of high-pressure fluid, the method comprising the steps of:

fixing the supporting stage to a predetermined position in the casing of the compressor and the supporting stage providing a position reference for successive assembling;

inserting one end of a transmission shaft of the lower scroll to an axial hole of a lower shell, another end of the transmission shaft passing an axial hole in the supporting stage such that both ends of the transmission shaft are retained by the two axial holes; and

inserting at least one pin into corresponding pin hole such that the upper scroll and the transmission shaft are coaxially positioned.

14. The method for assembling a compressor as in claim 13, wherein the step of inserting at least one pin into corresponding pin hole comprising:

aligning a pin hole of the upper scroll to a pin of the supporting stage, inserting the pin into the pin hole of the upper scroll to position the upper scroll and the supporting stage.

15. The method for assembling a compressor as in claim 13, wherein the step of inserting at least one pin into corresponding pin hole comprising:

aligning a pin hole of the casing to a pin of the supporting stage, inserting the pin into the pin hole of the upper scroll to position the upper scroll and the supporting stage.