Oil-free scroll vacuum pump

Abstract

This invention provides an oil-free scroll vacuum pump, comprising a pump body, a rotating shaft, a fan mounted on the rotating shaft, a compression chamber disposed within the pump body, and an end cap disposed at the end of the pump body communicating with the compression chamber. A raised ring is provided at the center of the end cap, and multiple raised ribs are distributed circumferentially around the axis of the raised ring on the surface of the end cap. Adjacent raised ribs form heat dissipation channels, the outer openings of which communicate with the outside. Each raised rib's end is connected to the raised ring, and the raised ring also has a gas ballast hole connected to the compression chamber. This invention, through the cooperation of the raised ring and raised ribs, forms multiple heat dissipation channels communicating with the outside on the surface of the end cap. The rotating shaft drives the fan to rotate, thus dissipating heat from the pump body. The gas ballast hole on the raised ring connects the compression chamber to the external fan, allowing dry external gas to enter the center of the compression chamber through the gas ballast hole, thereby diluting condensable vapors, preventing condensation, and working in conjunction with the fan to achieve a cooling effect and maintain pump performance.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump equipment technology, and in particular to an oil-free vortex vacuum pump. Background Technology

[0002] Oil-free scroll vacuum pumps generate a lot of heat during operation, causing the pump body temperature to rise sharply. Therefore, a cooling device is needed to cool and dissipate heat from the pump body. Currently, all oil-free scroll vacuum pumps on the market are equipped with a heat dissipation device. This heat dissipation device generally includes a fan blade and a fan blade cover. The outer surface of the end cover of the oil-free scroll vacuum pump is provided with heat dissipation ribs in the circumferential direction. The fan blade is connected to the shaft of the oil-free scroll vacuum pump that extends out of the end cover. The fan blade cover covers the fan blade and is fixed on the heat dissipation ribs.

[0003] Although this type of oil-free vortex vacuum pump can achieve heat dissipation through the rotation of the fan blades, it is difficult to guide dry gas into the compression chamber during use to dilute condensable vapors, and it is difficult to further prevent the formation of condensate on the stationary vortex plate. Moreover, its heat dissipation effect is limited. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an oil-free vortex vacuum pump to solve the problem that it is difficult to guide dry gas into the sealed chamber through the end cover, which affects the pump performance.

[0005] To achieve the above and other related objectives, this utility model provides an oil-free scroll vacuum pump, including a pump body, a rotating shaft, a fan mounted on the rotating shaft, a compression chamber mounted in the pump body, and an end cap located at the end of the pump body and communicating with the compression chamber. The end cap has a raised ring at its center, and multiple raised ribs are distributed circumferentially around the axis of the raised ring on its surface. Adjacent raised ribs form a heat dissipation channel, and the outer opening of the heat dissipation channel communicates with the outside. The end of each raised rib is connected to the raised ring, and the raised ring is also provided with a gas ballast hole connected to the compression chamber.

[0006] By adopting the above technical solution, multiple heat dissipation air channels connected to the outside are formed on the end cover surface through the cooperation of the convex ring and convex rib. The fan can be driven to rotate by the rotating shaft, which can dissipate heat from the pump body. Gas ballast holes are set on the convex ring to connect the compression chamber with the external fan. Dry gas from the outside can enter the middle of the compression chamber through the gas ballast holes, thereby diluting condensable vapors, preventing condensation, and working with the fan to dissipate heat and maintain the pump's performance.

[0007] In one embodiment of this utility model, the gas ballast hole is arranged along the axial direction of the end cover and passes through the protruding ring, so that the compression chamber is connected to the outside of the end cover. The gas ballast hole is set as a tapered hole on the side facing the compression chamber.

[0008] By adopting the above technical solution, steam can be discharged through the gas ballast hole to reduce liquid residue, protect the scroll plate from corrosion or scaling, and extend the service life of the pump.

[0009] In one embodiment of the present invention, an air ballast channel is formed between the two convex ribs, the end of the air ballast channel is located at the convex ring, the air ballast hole is provided at the end of the air ballast channel, and the end of the air ballast channel is also provided with a connecting hole connecting the air ballast channel and the air ballast hole, the connecting hole being perpendicular to the axis of the air ballast hole.

[0010] By adopting the above technical solution, the gas ballast channel is connected to the gas ballast hole through the connection hole, which makes it easier for the gas ballast hole to guide the dry gas into the compression chamber.

[0011] In one embodiment of the present invention, a fan cover is provided outside the end cap, and the rib has mounting holes for mounting the fan cover, and the outer edge of the fan cover is adapted to the outer end of the rib.

[0012] By adopting the above technical solution, the fan cover can be placed outside the ribs, and each heat dissipation channel can be connected to the outside world, so as to achieve heat dissipation effect in conjunction with the fan, and make the overall structure more compact.

[0013] In one embodiment of this utility model, the fan cover has multiple ventilation openings distributed circumferentially on its surface.

[0014] By adopting the above technical solution, multiple ventilation openings are used in conjunction with heat dissipation ducts to improve heat dissipation.

[0015] In one embodiment of the present invention, the edge of the end cap is provided with a raised edge extending along the axial direction of the end cap, the raised edge extending toward the direction of the raised rib, and the height of the raised edge is lower than the height of the raised rib.

[0016] By adopting the above technical solution, the convex edge and convex rib can guide the gas and further improve the heat dissipation effect.

[0017] In one embodiment of this utility model, an arc-shaped through groove communicating with the air ballast duct is also provided on the protruding edge.

[0018] By adopting the above technical solution, the flow of gas within the gas ballast duct is facilitated.

[0019] In one embodiment of this utility model, the width of the gas ballast air duct is greater than that of the heat dissipation air duct.

[0020] By adopting the above technical solution, it is easier for gas to enter the gas ballast hole.

[0021] As described above, the oil-free vortex vacuum pump of this utility model has the following beneficial effects: through the cooperation of the convex ring and the convex rib, multiple heat dissipation air channels communicating with the outside are formed on the surface of the end cover. The fan can be driven to rotate by the rotating shaft, which can dissipate heat from the pump body. Gas ballast holes are set on the convex ring to connect the compression chamber with the external fan. Dry gas from the outside can enter the middle of the compression chamber through the gas ballast holes, thereby diluting condensable vapors, preventing condensation, and working with the fan to dissipate heat and maintain the pump's performance. Attached Figure Description

[0022] Figure 1 The diagram shows the overall structure disclosed in the embodiments of this utility model.

[0023] Figure 2 The image shown is a schematic diagram of the fan installation disclosed in an embodiment of this utility model;

[0024] Figure 3 The diagram shown is a structural schematic of the end cap disclosed in an embodiment of this utility model;

[0025] Component designation explanation

[0026] 1. Pump body; 2. Shaft; 3. Fan; 4. Compression chamber; 5. End cover; 6. Raised ring; 7. Raised rib; 8. Heat dissipation duct; 9. Gas ballast hole; 10. Gas ballast duct; 11. Connection hole; 12. Raised edge; 13. Arc-shaped through groove; 14. Heat dissipation groove; 15. Fan cover; 16. Mounting hole; 17. Ventilation hole. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] Please see Figures 1 to 3 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0029] like Figure 1 , Figure 2 , Figure 3 As shown, this utility model provides an oil-free vortex vacuum pump, including a pump body 1, a rotating shaft 2, a fan 3 mounted on the rotating shaft 2, a compression chamber 4 mounted inside the pump body 1, and an end cover 5 mounted at the end of the pump body 1 and communicating with the compression chamber 4. A protruding ring 6 is provided at the center of the end cover 5, and multiple protruding ribs 7 are distributed circumferentially around the axis of the protruding ring 6 on the surface of the end cover 5. Adjacent protruding ribs 7 form a heat dissipation channel 8. The rotating shaft 2 drives the fan 3 to rotate, which, together with the heat dissipation channel, achieves a heat dissipation effect on the pump body 1.

[0030] The outer opening of the heat dissipation duct 8 is connected to the outside. The end of each rib 7 is connected to the rib 6. The rib 6 is also provided with a gas ballast hole 9 connected to the compression chamber 4. The gas ballast hole 9 is arranged along the axial direction of the end cover 5 and passes through the rib 6, so that the compression chamber 4 is connected to the outside of the end cover 5. The gas ballast hole 9 is set as a tapered hole on the side facing the compression chamber 4.

[0031] A gas ballast duct 10 is formed between the two convex ribs 7. The width of the gas ballast duct 10 is greater than that of the heat dissipation channel. The end of the gas ballast duct 10 is located at the convex ring 6. The gas ballast hole 9 is provided at the end of the gas ballast duct 10. The end of the gas ballast duct 10 is also provided with a connecting hole 11 that connects the gas ballast duct 10 and the gas ballast hole 9. The connecting hole 11 is perpendicular to the axis of the gas ballast hole 9. It can connect the gas ballast duct 10 and the gas ballast hole 9, so that the dry gas can also enter the compression chamber 4 through the gas ballast duct 10.

[0032] The edge of the end cap 5 is provided with a raised edge 12 extending along the axial direction of the end cap 5. The raised edge 12 extends toward the raised direction of the raised rib 7, and the height of the raised edge 12 is lower than the height of the raised rib 7. The raised edge 12 and the outer end of the raised rib 7 are spaced apart.

[0033] The raised edge 12 is also provided with an arc-shaped through groove 13 that communicates with the gas ballast air duct 10. The center of the arc-shaped through groove 13 is concentric with the connecting hole 11, and the gas ballast valve can be installed at the arc-shaped through groove 13 in conjunction with the connecting hole 11.

[0034] The convex ring 6 is also provided with multiple heat dissipation slots 14. The heat dissipation slots 14 are set in an arc shape, and four heat dissipation slots 14 are evenly distributed around the axis of the end cover 5. The heat dissipation slots 14 are located inside the heat dissipation air duct 8.

[0035] A fan cover 15 is provided on the outside of the end cap 5. The rib 7 has mounting holes 16 for mounting the fan cover 15. The fan cover 15 is mounted on the rib 7 by fasteners. The outer edge of the fan cover 15 is adapted to the outer end of the rib. The outer end face of the fan cover 15 is set as a conical surface, and multiple ventilation holes are distributed circumferentially on the conical surface.

[0036] In summary, this utility model, through the cooperation of the convex ring 6 and the convex rib 7, forms multiple heat dissipation air channels 8 on the surface of the end cover 5 that communicate with the outside. The fan 3 can be driven to rotate by the rotating shaft 2, which can dissipate heat from the pump body 1. Gas ballast holes 9 are provided on the convex ring 6 to connect the compression chamber 4 with the external fan 3. Dry gas from the outside can enter the middle of the compression chamber 4 through the gas ballast holes 9, thereby diluting condensable vapors, preventing condensation, and working with the fan 3 to achieve a heat dissipation effect and maintain the pump's performance.

[0037] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0038] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An oil-free scroll vacuum pump, comprising a pump body, a rotating shaft, a fan mounted on the rotating shaft, a compression chamber disposed within the pump body, and an end cap disposed at the end of the pump body communicating with the compression chamber, characterized in that, A raised ring is provided at the center of the end cap, and multiple raised ribs are distributed circumferentially around the axis of the raised ring on the surface of the end cap. Adjacent raised ribs form a heat dissipation air channel. The outer opening of the heat dissipation air channel is connected to the outside. The end of each raised rib is connected to the raised ring. The raised ring is also provided with an air ballast hole connected to the compression chamber.

2. The oil-free scroll vacuum pump according to claim 1, characterized in that: The gas ballast hole is arranged along the axial direction of the end cover and passes through the protruding ring, so that the compression chamber is connected to the outside of the end cover. The gas ballast hole is set as a tapered hole on the side facing the compression chamber.

3. The oil-free vortex vacuum pump according to claim 1, characterized in that: A gas ballast channel is formed between the two convex ribs. The end of the gas ballast channel is located at the convex ring. The gas ballast hole is provided at the end of the gas ballast channel. The end of the gas ballast channel is also provided with a connecting hole that connects the gas ballast channel and the gas ballast hole. The connecting hole is perpendicular to the axis of the gas ballast hole.

4. The oil-free scroll vacuum pump according to claim 1, characterized in that: A fan cover is provided on the outside of the end cap, and the rib has mounting holes for mounting the fan cover. The outer edge of the fan cover is adapted to the outer end of the rib.

5. The oil-free scroll vacuum pump according to claim 4, characterized in that: The fan cover has multiple ventilation openings distributed circumferentially on its surface.

6. The oil-free scroll vacuum pump according to claim 1, characterized in that: The end cap edge is provided with a raised edge extending along the end cap axial direction, the raised edge extending toward the direction of the raised rib, and the height of the raised edge is lower than the height of the raised rib.

7. The oil-free vortex vacuum pump according to claim 6, characterized in that: The raised edge is also provided with an arc-shaped through groove that communicates with the air ballast duct.

8. The oil-free scroll vacuum pump according to claim 3, characterized in that: The width of the air ballast duct is greater than that of the heat dissipation duct.

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