Suction structure of oil-free scroll compressor and oil-free scroll compressor

Abstract

The application relates to the field of compressor design, and discloses an air suction structure of an oil-free scroll compressor, which comprises a static scroll disc and a dynamic scroll disc, the static scroll disc is provided with an air suction port, an air exhaust port and a first scroll disc, the dynamic scroll disc is provided with a second scroll disc matched with the first scroll disc, the static scroll disc is fixedly arranged, the dynamic scroll disc can be driven to translate relative to the static scroll disc along a predetermined track, the second scroll disc is provided with an air suction cavity, the air suction cavity is sequentially connected by a scroll outer wall of the dynamic scroll disc, a first arc-shaped guide section, a straight line guide section, a second arc-shaped guide section and a scroll inner wall, and the air suction port is located above the air suction cavity. Correspondingly, the application further discloses an oil-free scroll compressor. By adopting the application, the resistance encountered by gas when entering the air suction structure can be reduced, the compression efficiency can be improved, and the energy consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor design, in particular to an air suction structure of an oil-free scroll compressor and an oil-free scroll compressor. BACKGROUND

[0002] As a power mechanism in air compression system, the compressor plays an important role in the whole air compression system. The oil-free scroll compressor can be used in clean air source field, such as medical and laboratory, because it can realize oil-free compression and has the characteristics of high efficiency, small size, light weight and stable operation. It realizes the compression of gas by changing the volume of the gas passage between the static scroll disc and the dynamic scroll disc through the relative periodic motion of the static scroll disc and the dynamic scroll disc, and by pressing the gas from the air suction port to the air outlet port. The air suction port of the static scroll disc is generally arranged in the crescent-shaped air suction cavity composed of two side groove walls and an arc-shaped end. The air suction port is generally circular, and the diameter is smaller than the distance between the two side groove walls. Such structure has small air suction area and small flow area, and cannot guide and arrange the inhaled air, which will cause large air suction resistance, increase the power consumption of the compressor, and reduce the performance of the compressor. SUMMARY

[0003] In order to solve the defects of the prior art, the present application provides an air suction structure of an oil-free scroll compressor and an oil-free scroll compressor, which can reduce the resistance encountered by the gas when entering the air suction structure, improve the compression efficiency, and reduce the energy consumption.

[0004] In order to solve the above technical problems, the present application provides an air suction structure of an oil-free scroll compressor, which comprises a static scroll disc and a dynamic scroll disc. The static scroll disc is provided with an air suction port, an air outlet port and a first scroll disc. The dynamic scroll disc is provided with a second scroll disc matched with the first scroll disc. The static scroll disc is fixedly arranged, and the dynamic scroll disc can be driven to translate relative to the static scroll disc along a predetermined track. The second scroll disc is provided with an air suction cavity, which is sequentially connected by a scroll outer wall of the dynamic scroll disc, a first arc-shaped guide section, a straight guide section, a second arc-shaped guide section and a scroll inner wall. The air suction port is located above the air suction cavity.

[0005] As an improvement of the above-mentioned scheme, the scroll outer wall is provided with a groove parallel to the direction of the scroll outer wall.

[0006] As an improvement of the above-mentioned scheme, two or more grooves are arranged in parallel on the scroll outer wall at a predetermined distance from each other.

[0007] As an improvement of the above-mentioned scheme, the groove extends from the starting point of the scroll outer wall to the four-fifths to two-fifths of the circumference of the scroll outer wall.

[0008] As an improvement of the above scheme, the air inlet comprises a horizontal straight edge parallel to the straight guide section, a vertical straight edge matched with the outer scroll wall of the scroll, and an inclined edge opposite to the vertical straight edge; a guide arc edge is arranged between the vertical straight edge and the horizontal straight edge and between the horizontal straight edge and the inclined edge.

[0009] As an improvement of the above scheme, the air inlet further comprises a top edge, and the length of the horizontal straight edge is greater than the length of the top edge.

[0010] As an improvement of the above scheme, the air inlet is arranged at the starting point of the first scroll, and the upper edge of the air inlet is flush with the front end of the first scroll.

[0011] As an improvement of the above scheme, the air outlet is arranged at the center of the static scroll.

[0012] As an improvement of the above scheme, the back surface of the static scroll is provided with a reinforcing rib.

[0013] Correspondingly, the application further provides an oil-free scroll compressor comprising the air inlet structure of the oil-free scroll compressor as described above.

[0014] The embodiment of the application has the following beneficial effects:

[0015] By adopting the embodiment, the second scroll is provided with an air inlet cavity, and the air inlet cavity is sequentially connected by the outer scroll wall of the dynamic scroll, the arc-shaped guide section, the straight guide section and the inner scroll wall. The addition of the straight guide section can increase the cross-sectional area of the front end of the air inlet cavity, form an air passage space with gradually decreasing cross-sectional area, and after the air enters the air inlet with a small cross section, the air is first arranged in a larger space, contacts the straight guide section, and then passes through the arc-shaped guide section to guide the airflow to turn and flow to a deeper part of the second scroll. The arrangement of the air through the straight guide section and the arc-shaped guide section makes the flow more smooth, avoids the generation of additional resistance caused by turbulence, and improves the compression efficiency.

[0016] The air inlet further comprises a top edge, and the length of the horizontal straight edge is greater than the length of the top edge. The horizontal straight edge and the vertical straight edge can maximize the effective air inlet space of the air inlet. The length of the horizontal straight edge is greater than the length of the top edge, forming a trapezoidal air inlet structure, and the bottom of the trapezoid is close to the front end of the air inlet cavity, which can cooperate with the straight guide section of the air inlet cavity to guide the air entering in a straight line, prevent the air flowing into the air inlet cavity from generating turbulence, reduce noise and air inlet resistance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of an air inlet structure of an oil-free scroll compressor according to the application;

[0018] Figure 2 is a structural schematic diagram of a static scroll plate of the present application;

[0019] Figure 3 is a structural schematic diagram of a dynamic scroll plate of the present application;

[0020] Figure 4 is a schematic diagram of the first scroll plate and the second scroll plate in an assembled state of the present application;

[0021] Figure 5 is a structural schematic diagram of an air suction cavity of the present application;

[0022] Figure 6 is a structural schematic diagram of another embodiment of a static scroll plate of the present application;

[0023] Figure 7 is a structural schematic diagram of an air suction port of the present application;

[0024] Figure 8 is a sectional view of an oil-free scroll compressor of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described in further detail below in combination with the drawings. It is hereby declared that the up, down, left, right, front, back, inner and outer directions appearing or about to appear in the present application are based on the drawings of the present application, and are not specific limitations on the present application.

[0026] As shown in Figures 1-5 , the first embodiment of the present application provides an air suction structure of an oil-free scroll compressor, which comprises a static scroll plate 1 and a dynamic scroll plate 2, the static scroll plate 1 is provided with an air suction port 11, an air exhaust port 12 and a first scroll plate 13; the dynamic scroll plate 2 is provided with a second scroll plate 21 cooperating with the first scroll plate 13; the static scroll plate 1 is fixedly arranged, and the dynamic scroll plate 2 can be driven to translate relative to the static scroll plate 1 along a predetermined track. The second scroll plate 21 is provided with an air suction cavity 22, which is sequentially connected by a scroll outer wall 23, a first arc-shaped guide section 24, a straight guide section 25, a second arc-shaped guide section 27 and a scroll inner wall 26 of the dynamic scroll plate 2; the air suction port 11 is located above the air suction cavity 22. Figure 4 In the drawings, a dotted line is used as the boundary line of the scroll outer wall 23, the first arc-shaped guide section 24, the straight guide section 25, the second arc-shaped guide section 27 and the scroll inner wall 26.

[0027] With the embodiment, the second vortex disc 21 is provided with an air suction cavity 22, which is sequentially connected by the vortex outer wall 23, the arc-shaped guide section 24, the straight guide section 25 and the vortex inner wall 26 of the dynamic vortex disc 2. The addition of the straight guide section 25 can increase the cross-sectional area of the front end of the air suction cavity 22, forming an air passage space with gradually decreasing cross-sectional area. After the air enters the air suction port 11 with a smaller cross section, it is first arranged in a larger space, then contacts the straight guide section 25, and then passes through the arc-shaped guide section 24 to guide the airflow to turn and flow to a deeper part of the second vortex disc 21. The arrangement of the straight guide section 25 and the arc-shaped guide section 24 makes the airflow smoother, avoids the generation of additional resistance caused by turbulent flow, and improves the compression efficiency.

[0028] In combination Figure 6 As shown in FIG. 2, according to the second embodiment of the present application, the difference from the first embodiment is that the vortex outer wall 23 is provided with a groove 28 parallel to the trend of the vortex outer wall 23. The groove 28 can increase the air inlet cross section of the air suction cavity 22 on the one hand, and on the other hand, through the horizontal groove 28, it can guide the airflow flowing through the groove 28, and the guided airflow in the groove 28 in turn affects the airflow in the air suction cavity 22, so that the airflow flows smoothly and uniformly, and finally reduces the resistance generated by the airflow in the compression process, and improves the compression efficiency.

[0029] Further, two or more grooves 28 are arranged in parallel on the vortex outer wall 23 at a predetermined distance. In this embodiment, there are four grooves, forming four parallel airflows along the outer wall of the air suction cavity 22, improving the airflow guiding effect.

[0030] When the airflow enters the spiral deep part of the second vortex disc 21 from the air suction cavity 22, the airflow is mainly pushed forward by the extrusion of the first vortex disc 13 and the second vortex disc 21, so it is not necessary to deliberately increase the size of the flow passage cross section. The groove 28 extends from the starting point of the vortex outer wall 23 to the four-tenths to two-tenths of the circumference of the vortex outer wall 23, which can effectively guide the airflow at the initial stage while maintaining sufficient structural strength of the second vortex disc 21.

[0031] In combination Figure 7 As shown in FIG. 3, while the structure of the air suction cavity 22 is redesigned, the structure of the air suction port 11 is also designed to cooperate with it. Specifically, the air suction port 11 includes a horizontal straight edge 111 parallel to the straight guide section 25, a vertical straight edge 112 matched with the vortex outer wall 23, and an inclined edge 113 inclined to the vertical straight edge 112; a guide arc edge 114 is arranged between the vertical straight edge 112 and the horizontal straight edge 111, and between the horizontal straight edge 111 and the inclined edge 113.

[0032] The air inlet 11 further comprises a top edge 115, and the length of the transverse straight edge 111 is greater than the length of the top edge 115. Figure 6 In the embodiment, dotted lines are used as the boundaries of the transverse straight edge 111, the vertical straight edge 112, the inclined edge 113 and the top edge 115.

[0033] In the initial state, the air inlet 11 is located at the right part of the air inlet cavity 22, and with the movement of the orbiting scroll 2, the air inlet 11 moves left relative to the air inlet cavity 22. The transverse straight edge 111 and the vertical straight edge 112 can maximize the effective air inlet space of the air inlet 11. The length of the transverse straight edge 111 is greater than the length of the top edge 115, forming a trapezoidal air inlet structure, and the bottom of the trapezoid is close to the front end of the air inlet cavity 22, which can cooperate with the straight guide section 25 of the air inlet cavity 22 to guide the incoming air in a straight line, preventing the air flowing into the air inlet cavity from generating turbulence, reducing noise and air inlet resistance.

[0034] Preferably, the air inlet 11 is arranged at the starting point of the first scroll 13, and the upper edge of the air inlet 11 is flush with the front end of the first scroll 13. The air outlet is arranged at the center of the fixed scroll 1.

[0035] According to the above structure, the first scroll 13 of the fixed scroll 1 is arranged at the center of the bottom plate 14, and the edge of the bottom plate 14 has low strength. In order to increase the strength of the bottom plate 14 without increasing the thickness of the bottom plate 14, the back of the fixed scroll 1 is provided with a reinforcing rib 15. The reinforcing rib 15 is arranged outwardly diverging from the center of the air outlet 12.

[0036] In combination with Figure 8 The third embodiment of the present application further provides an oil-free scroll compressor comprising the air inlet structure of the oil-free scroll compressor as described above.

[0037] In this embodiment, the second scroll 21 is provided with an air inlet cavity 22, which is sequentially connected by the scroll outer wall 23, the arc-shaped guide section 24, the straight guide section 25 and the scroll inner wall 26 of the orbiting scroll 2. The addition of the straight guide section 25 can increase the cross-sectional area of the front end of the air inlet cavity 22, forming an air passage space with gradually decreasing cross-sectional area. After the air enters the air inlet 11 with a smaller cross section, it is first arranged in a larger space, and then contacts the straight guide section 25, and then passes through the arc-shaped guide section 24 to guide the airflow to turn and flow to the deeper part of the second scroll 21. The arrangement of the straight guide section 25 and the arc-shaped guide section 24 can make the gas flow more smoothly, avoid turbulence to generate additional resistance, and improve the compression efficiency.

[0038] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements are also considered to be within the scope of the present application.

Claims

1. The intake structure of an oil-free scroll compressor, characterized in that, It includes a stationary vortex disk and a moving vortex disk, wherein the stationary vortex disk is provided with an air intake port, an air exhaust port and a first vortex disk; The moving vortex disk is provided with a second vortex disk that cooperates with the first vortex disk; The stationary vortex disk is fixedly installed, and the moving vortex disk can be driven to translate relative to the stationary vortex disk along a predetermined trajectory. The second vortex disk is provided with an air intake chamber, which is formed by the sequential connection of the outer wall of the vortex of the moving vortex disk, the first arc-shaped guide section, the straight guide section, the second arc-shaped guide section and the inner wall of the vortex; The air intake is located above the air intake chamber; The outer wall of the vortex is provided with a groove parallel to the direction of the outer wall of the vortex; The air intake includes a horizontal straight edge parallel to the straight guide section, a vertical straight edge matching the outer wall of the vortex, and an inclined edge that is inclined relative to the vertical straight edge; a guide arc edge is provided between the vertical straight edge and the horizontal straight edge, and between the horizontal straight edge and the inclined edge.

2. The suction structure of the oil-free scroll compressor as described in claim 1, characterized in that, Two or more of the grooves are arranged parallel to each other on the outer wall of the vortex at a predetermined distance.

3. The suction structure of the oil-free scroll compressor as described in claim 1 or 2, characterized in that, The groove extends from the starting point of the outer wall of the vortex to a quarter to a half circumference of the outer wall of the vortex.

4. The suction structure of the oil-free scroll compressor as described in claim 1, characterized in that, The air intake also includes a top edge, and the length of the horizontal straight edge is greater than the length of the top edge.

5. The suction structure of the oil-free scroll compressor as described in claim 1, characterized in that, The air intake is located at the starting point of the first vortex disk, and the upper edge of the air intake is flush with the front end of the first vortex disk.

6. The suction structure of the oil-free scroll compressor as described in claim 1, characterized in that, The exhaust port is located at the center of the static vortex disk.

7. The suction structure of the oil-free scroll compressor as described in claim 1, characterized in that, The back of the static vortex disk is provided with reinforcing ribs.

8. An oil-free scroll compressor, characterized in that, Including the intake structure of the oil-free scroll compressor as described in any one of claims 1-7.

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