Pump chamber structure of electronic vacuum pump and electronic vacuum pump

Abstract

The invention provides a pump chamber structure of an electronic vacuum pump, which comprises a bottom plate, a pump ring and a cover plate, the bottom plate and the cover plate are respectively arranged on two end surfaces of the pump ring, and an inner cavity of the pump ring is enclosed into a pump chamber; the pump chamber structure is provided with an air inlet, the end face of the pump ring is provided with an air inlet sinking groove, the air inlet sinking groove is communicated with the air inlet, and the air inlet sinking groove is provided with an air inlet sinking groove opening facing an inner cavity of the pump chamber structure. The structure of the air inlet sinking groove, the air outlet sinking groove and the flow guide groove is integrated in the pump ring, the structure of the bottom plate and the structure of the cover plate are greatly simplified, the manufacturing cost of the bottom plate and the manufacturing cost of the cover plate are reduced, meanwhile, materials of the pump ring are reduced, the manufacturing cost of the pump ring is also reduced, and the overall manufacturing cost is reduced. And moreover, through the structural improvement of the pump chamber structure, air intake is smoother, the flow resistance is reduced, and the air exhaust performance of the vacuum pump is improved.

Description

Technical Field

[0001] The invention relates to the field of electronic vacuum pumps, and in particular to an improvement on the pump chamber structure of an electronic vacuum pump. Background Art

[0002] As regulations on automobile fuel consumption and carbon emissions gradually increase, small-displacement turbocharged engines and electric vehicles have become the choice of more and more automobile manufacturers. There are two types of vacuum pumps used in existing gasoline and diesel vehicles in China: one is a mechanical vacuum pump that relies on the engine to provide power; the other is an electronic vacuum pump that relies on its own motor to provide power.

[0003] For cars equipped with small-displacement turbocharged engines, their vacuum-assisted brake systems may have insufficient vacuum under certain operating conditions, affecting driving safety. At this time, an electronic vacuum pump can provide an additional vacuum source to ensure the normal operation of the vacuum booster and ensure driving safety. Electric vehicles equipped with vacuum-assisted brake systems require additional devices to provide vacuum because there is no engine to provide vacuum. Electronic vacuum pumps are a good choice.

[0004] The electronic vacuum pump of the prior art, such as Chinese patent application 201920016265.9, discloses a pump chamber structure of an electronic vacuum pump and an electronic vacuum pump with pump chamber noise reduction. The pump chamber structure of the vacuum pump is composed of a cover plate, a pump ring and a bottom plate, wherein the cover plate is provided with an upper guide groove, the bottom plate is provided with a lower guide groove, and upper and lower air holes are provided at both ends of the pump ring. The pump chamber structure realizes multi-path exhaust at one exhaust position through an exhaust structure. The bottom plate, cover plate and pump ring structure of the pump chamber structure of the vacuum pump are complex, the production process is complex, the production cost is high, and the quality risk is high. In addition, the upper guide groove and the lower guide groove are respectively arranged on the cover plate and the bottom plate, the airway is complex, the airflow is turbulent, and the air pressure changes fluctuate, which is not conducive to the improvement of the exhaust performance. Summary of the invention

[0005] Therefore, in view of the above problems, the present invention provides a pump chamber structure of an electronic vacuum pump and an electronic vacuum pump.

[0006] The present invention is implemented by the following scheme:

[0007] The present invention proposes a pump chamber structure of an electronic vacuum pump, comprising a base plate, a pump ring, and a cover plate, wherein the base plate and the cover plate are respectively mounted on the two end surfaces of the pump ring to enclose an inner cavity of the pump ring to form a pump chamber, and the pump chamber structure has an air inlet; it is characterized in that at least one end surface of the pump ring is provided with an air inlet groove, the air inlet groove is connected with the air inlet, and the air inlet groove is provided with an air inlet groove opening facing the pump chamber and connected with the pump chamber.

[0008] In one embodiment, ventilation channels for ventilation are provided on the bottom plate and the cover plate, and the ventilation channels for ventilation only include through holes or through grooves.

[0009] In one embodiment, the base plate is installed on the lower end surface of the pump ring, the air intake groove is arranged on the lower end surface of the pump ring, and a lower air intake groove is penetrated through the base plate. The shape and position of the lower air intake groove are adapted to the air intake groove on the lower end surface of the pump ring, so that the lower air intake groove is connected with the air intake groove.

[0010] In one embodiment, an upper air outlet through hole is provided through the cover plate, and the upper air outlet through hole is connected to the pump chamber.

[0011] In one embodiment, the upper and lower end surfaces of the pump ring are respectively provided with air intake grooves, and the air intake grooves are provided with air intake groove openings facing the pump chamber, and the air intake grooves on the upper and lower end surfaces of the pump ring are connected to each other through channels in the side walls of the pump ring.

[0012] In one embodiment, the air intake grooves on the upper and lower end surfaces of the pump ring are symmetrically arranged, and the air intake grooves penetrate the side wall of the pump ring to form an integral through groove.

[0013] In one embodiment, the upper and lower end surfaces of the pump ring are also correspondingly provided with air outlet grooves, and the air outlet grooves on the upper and lower end surfaces of the pump ring are interconnected through channels in the side walls of the pump ring, and the air outlet grooves have air outlet groove openings facing the pump ring cavity.

[0014] In one embodiment, the air outlet groove opening facing the pump ring cavity is provided with a chamfer.

[0015] In one embodiment, the air intake groove opening facing the pump chamber is arranged at one end of the air intake groove, and the air intake groove extends away from the air intake groove body at the air intake groove opening to form a guide groove, and the guide groove is connected to the pump chamber as a whole.

[0016] Among them, in one embodiment, the upper and lower end surfaces of the pump ring are also correspondingly provided with air outlet grooves, and the air outlet grooves on the upper and lower end surfaces of the pump ring are connected to each other through channels in the side walls of the pump ring, and the air outlet groove has an air outlet groove opening facing the pump ring cavity, and the air inlet groove opening of the air inlet groove facing the pump chamber is arranged at one end of the air inlet groove away from the air outlet groove.

[0017] The present invention also proposes an electronic vacuum pump, characterized in that it includes a motor assembly, a base, a pump body cover, a vane assembly and the pump chamber structure as described above, wherein the vane assembly is installed in the pump chamber, the pump chamber structure and the motor assembly are respectively installed on both sides of the base, and the pump chamber structure and the base are sealed.

[0018] In one embodiment, the bottom plate of the pump chamber structure is sealed with the base through a sealing ring.

[0019] The technical solution provided by the present invention has the following technical effects:

[0020] The pump chamber structure of the present invention integrates the air inlet sink groove, air outlet sink groove and guide groove into the pump ring, which greatly simplifies the structure of the bottom plate and the cover plate, reduces the manufacturing cost of the bottom plate and the cover plate; it also saves the material of the pump ring, reduces the manufacturing cost of the pump ring, and reduces the overall manufacturing cost. In addition, the structural improvement of the pump chamber structure makes the air intake smoother, which is conducive to reducing the flow resistance and improving the air extraction performance of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the pump chamber structure;

[0022] Figure 2 It is an exploded view of the pump room structure;

[0023] Figure 3 It is a three-dimensional diagram of the bottom plate of the pump room structure;

[0024] Figure 4 It is a three-dimensional diagram of the cover plate of the pump chamber structure;

[0025] Figure 5 It is a three-dimensional diagram of the pump ring;

[0026] Figure 6 This is the top view of the pump ring;

[0027] Figure 7 yes Figure 6 Middle AA section cutaway view;

[0028] Figure 8 yes Figure 6 Middle BB section cutaway view;

[0029] Fig. 9 It is a three-dimensional diagram of the bottom through structure of the pump ring air intake sink groove;

[0030] Fig.10 It is a top view of the bottom through structure of the pump ring air inlet sink groove;

[0031] Fig.11 is a three-dimensional diagram of the pump ring in Example 2;

[0032] Fig.12 is a stereoscopic view of the other end surface direction of the pump ring in Example 2;

[0033] Fig.13 It is a stereogram of an electronic vacuum pump;

[0034] Fig.14 is a cross-sectional view of an electronic vacuum pump;

[0035] Fig.15 It is an assembly drawing of the base, bottom plate of the pump chamber structure, pump ring and rotor assembly. DETAILED DESCRIPTION

[0036] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0037] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0038] Example 1

[0039] like Figure 1-8 As shown, the pump chamber structure of the electronic vacuum pump of this embodiment includes a base plate 10, a pump ring 20 and a cover plate 30. The base plate 10 and the cover plate 30 are respectively installed on the two end surfaces of the pump ring 20 to enclose the inner cavity of the pump ring 20 into a pump chamber 210.

[0040] An air intake groove 21 is provided on both end surfaces of the pump ring 20, and the air intake groove 21 is provided with an air intake groove opening 28 facing the pump chamber 210. The air intake groove 21 is correspondingly arranged on the two end surfaces of the pump ring 20 up and down. Preferably, the air intake groove 21 is symmetrically arranged on the two end surfaces of the pump ring 20 up and down. The air intake grooves 21 on the upper and lower end surfaces of the pump ring 20 are interconnected through channels in the side walls of the pump ring 20. For example, the air intake groove 21 is a blind groove of a non-through structure, and a plurality of middle air intake holes 23 are provided on the bottom surface of the air intake groove 21, and the plurality of middle air intake holes 23 may be one or more; the middle air intake hole 23 penetrates the pump ring 20 up and down, so that the middle air intake hole 23 is connected to the two air intake grooves 21 symmetrically arranged on the two end surfaces of the pump ring 20 up and down. Preferably, the number of middle air intake holes 23 correspondingly arranged on the bottom surface of a single air intake groove 21 is 4. Alternatively, the air intake grooves 21 are symmetrically arranged on both end surfaces of the pump ring 20, and the air intake grooves 21 penetrate the side wall of the pump ring 20 to form an integral through groove. Figure 9-10 shown.

[0041] The pump chamber structure is provided with an air inlet, and the air inlet groove 21 is connected to the air inlet. The bottom plate 10 and the cover plate 30 are provided with ventilation channels for ventilation, and the ventilation channels for ventilation only include through holes or through grooves. In this embodiment, the air inlet is a lower air inlet groove 11 that is provided through the bottom plate 10. A positioning hole 12 is also provided through the bottom plate 10, and the positioning hole 12 is used for positioning when the bottom plate 10 is installed. The lower air inlet groove 11 is in the shape of a curved long groove that is provided through the bottom plate 10, and its shape and position are adapted to the air inlet groove 21 on the lower end surface of the pump ring 20, so that the lower air inlet groove 11 is connected to the air inlet groove 21. This arrangement simplifies the processing technology of the bottom plate 10 and the cover plate 30, and greatly reduces the production cost of the bottom plate 10 and the cover plate 30.

[0042] The end surface of the pump ring 20 is also provided with an air outlet groove 22, which is correspondingly arranged on the two end surfaces of the pump ring 20 up and down. Preferably, the air outlet groove 22 is symmetrically arranged on the two end surfaces of the pump ring 20 up and down. The air outlet grooves 22 on the upper and lower end surfaces of the pump ring 20 are connected to each other through the channel in the side wall of the pump ring 20. For example, the air outlet groove 22 is a blind groove of a non-through structure, and a middle air outlet through hole 24 is arranged on the bottom surface of the air outlet groove 22. The middle air outlet through hole 24 passes through the pump ring 20 up and down, so that the middle air outlet through hole 24 connects the two air outlet grooves 22 correspondingly arranged on the two end surfaces of the pump ring 20 up and down. The air outlet groove 22 has an air outlet groove opening 29 facing the cavity of the pump ring 20, so that the air outlet groove 22 is connected to the cavity of the pump ring 20. The air outlet groove opening 29 of the air outlet groove 22 facing the cavity of the pump ring 20 is provided with a chamfer, so that the gas flow is smoother.

[0043] like Figure 5-6 As shown, an end of the air inlet sink 21 away from the air outlet sink 22 is provided with an air inlet sink opening 28 facing the pump chamber 210, and the air inlet sink 21 is connected to the pump chamber 210 through the air inlet sink opening 28. The air inlet sink 21 extends away from the air inlet sink 21 body at the air inlet sink opening 28 to form a guide groove 25, and preferably, the air inlet sink 21 extends away from the air outlet sink 22 at the air inlet sink opening 28 to form a guide groove 25, and the guide groove 25 is connected to the cavity of the pump ring 20 as a whole, thereby expanding the opening area of ​​the air inlet sink 21 connected to the cavity of the pump ring 20. The guide grooves 25 are correspondingly arranged on the two end surfaces of the pump ring 20, and preferably, the guide grooves 25 are symmetrically arranged on the two end surfaces of the pump ring 20.

[0044] An upper air outlet hole 31 is provided through the cover plate 30. The upper air outlet hole 31 is connected to the cavity of the pump ring 20. The cover plate 30 is also provided with mounting holes 33 and positioning grooves 32. There are four mounting holes 33, which are evenly distributed around the circumference of the cover plate 30. Similarly, mounting holes 13, 27 and positioning grooves 14, 26 are also provided through the corresponding positions of the base plate 10 and the pump ring 20, so that the base plate 10, the pump ring 20 and the cover plate 30 can be positioned at the installation angle and fixed as a whole through the mounting holes 13, 27, 33 and the positioning grooves 14, 26, 32.

[0045] In this embodiment, the pump chamber 210 formed by the base plate 10, the pump ring 20 and the cover plate 30 has a first air inlet channel and a second air inlet channel. The first air inlet channel is: the lower air inlet groove 11, the air inlet groove 21 on the lower end face of the pump ring 20, and the pump chamber 210. The second air inlet channel is: the lower air inlet groove 11, the air inlet groove 21 on the lower end face of the pump ring 20, the middle air inlet hole 23, the air inlet groove 21 on the upper end face of the pump ring 20, and the pump chamber 210.

[0046] The pump chamber 210 formed by the bottom plate 10, the pump ring 20 and the cover plate 30 also has a first air outlet channel and a second air outlet channel. The first air outlet channel is: the pump chamber 210, the upper air outlet hole 31. The second air outlet channel is: the pump chamber 210, the air outlet groove 22 on the lower end surface of the pump ring 20, the middle air outlet hole 24, the air outlet groove 22 on the upper end surface of the pump ring 20, and the upper air outlet hole 31.

[0047] The first air inlet channel, the second air inlet channel, the first air outlet channel and the second air outlet channel are respectively arranged in two groups symmetrically around the center on the bottom plate 10, the pump ring 20 and the cover plate 30. Therefore, four-inlet and four-outlet air inlet and outlet channels can be formed by two sets of air inlet and outlet structures.

[0048] The pump chamber structure of this embodiment greatly simplifies the structure of the bottom plate 10 and the cover plate 30, and reduces the manufacturing cost of the bottom plate 10 and the cover plate 30, because the air inlet sink groove 21, the air outlet sink groove 22 and the guide groove 25 are integrated into the pump ring 20; and because the bottom plate 10 and the cover plate 30 are not provided with air inlet and outlet sink grooves, the thickness of the bottom plate 10 and the cover plate 30 can be thinned, and the material of the two components of the bottom plate 10 and the cover plate 30 can be reduced, and the manufacturing cost of the bottom plate 10 and the cover plate 30 can be further reduced. Since the pump ring 20 is provided with structures such as the air inlet sink groove 21, the air outlet sink groove 22 and the guide groove 25, the material of the pump ring 20 is saved, the manufacturing cost of the pump ring 20 is reduced, and the overall manufacturing cost is reduced. In addition, the improved structure of the pump ring 20 makes the air intake smoother, which is conducive to reducing the flow resistance and improving the air extraction performance of the vacuum pump.

[0049] Example 2

[0050] This embodiment further simplifies the structure of the pump ring 20 based on the embodiment 1. Figure 11-12 As shown, in this embodiment, the air intake groove 21, the air intake groove opening 28 and the guide groove 25 are only provided on one of the end faces of the pump ring 20. The structure of the air intake groove 21, the air intake groove opening 28 and the guide groove 25 is the same as that of the aforementioned embodiment. Preferably, the air intake groove 21, the air intake groove opening 28 and the guide groove 25 are only provided on the lower end face of the pump ring 20, and the lower end face of the pump ring 20 is the contact and matching surface between the pump ring 20 and the base plate 10, and the base plate 10 is installed on the lower end face of the pump ring 20. The upper end face of the pump ring 20 is only provided with a mounting hole 27 and a positioning hole 271, and the positioning hole 271 is used for auxiliary installation and positioning of the pump ring 20. The positioning hole 271 can be provided on both end faces of the pump ring 20. The structure of the base plate 10 and the cover plate 30 is the same as that of the aforementioned embodiment. The air intake groove 21, the air intake groove opening 28 and the guide groove 25 are only provided on one end surface of the pump ring 20, which can simplify the structure of the pump ring 20 to a greater extent, thereby greatly reducing the complexity of the manufacturing process and thus reducing the manufacturing cost.

[0051] Example 3

[0052] Based on the pump chamber structure in the above-mentioned embodiment, the present invention also provides an electronic vacuum pump, such as Figure 13-15 As shown, it includes a motor assembly 40, a base 50, a pump body cover 60, a vane assembly 70 and the pump chamber structure in the above-mentioned embodiment. The vane assembly 70 is installed in the pump chamber 210, and the pump chamber structure and the motor assembly 40 are respectively installed on both sides of the base 50, and the pump chamber structure and the base 50 are sealed. Preferably, the base plate 10 of the pump chamber structure is sealed with the base 50 through a sealing ring. The motor shaft of the motor assembly 40 can pass through the base 50, thereby driving the vane assembly 70 in the pump chamber structure to rotate.

[0053] The base 50 is provided with an air intake pipe 51 and an air exhaust pipe 52. The air intake pipe 51 is connected to the air intake passage of the pump chamber structure. Air enters the pump chamber structure cavity through the air intake passage from the air intake pipe 51, is compressed by the vane assembly 70, and is discharged through the exhaust passage to the cavity formed by the pump chamber structure shell and the pump body cover 60. The cavity is connected to the exhaust pipe 52, and the gas is finally discharged from the exhaust pipe 52.

[0054] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A pump chamber structure of an electronic vacuum pump, comprising a base plate, a pump ring, and a cover plate, wherein the base plate and the cover plate are respectively mounted on both end surfaces of the pump ring to enclose the inner cavity of the pump ring to form a pump chamber, wherein the pump chamber structure has an air inlet; characterized in that: At least one end surface of the pump ring is provided with an air intake groove, the air intake groove is communicated with the air inlet, and the air intake groove is provided with an air intake groove opening facing the pump chamber and communicating with the pump chamber.

2. The pump chamber structure according to claim 1, characterized in that: The bottom plate and the cover plate are provided with ventilation channels for ventilation, and the ventilation channels for ventilation only include through holes or through grooves.

3. The pump chamber structure according to claim 2, characterized in that: The bottom plate is mounted on the lower end surface of the pump ring, the air intake groove is arranged on the lower end surface of the pump ring, a lower air intake groove is penetrated through the bottom plate, the shape and position of the lower air intake groove are matched with the air intake groove on the lower end surface of the pump ring, so that the lower air intake groove is connected with the air intake groove.

4. The pump chamber structure according to claim 2, characterized in that: An upper air outlet through hole is provided on the cover plate, and the upper air outlet through hole is connected to the pump chamber.

5. The pump chamber structure according to claim 1, characterized in that: The upper and lower end surfaces of the pump ring are correspondingly provided with air intake grooves, and the air intake grooves are provided with air intake groove openings facing the pump chamber. The air intake grooves on the upper and lower end surfaces of the pump ring are connected to each other through channels in the side walls of the pump ring.

6. The pump chamber structure according to claim 5, characterized in that: The air intake grooves on the upper and lower end surfaces of the pump ring are symmetrically arranged, and the air intake grooves penetrate the side wall of the pump ring to form an integral through groove.

7. The pump chamber structure according to claim 1, characterized in that: The upper and lower end surfaces of the pump ring are also correspondingly provided with air outlet grooves, and the air outlet grooves on the upper and lower end surfaces of the pump ring are interconnected through channels in the side walls of the pump ring, and the air outlet grooves have air outlet groove openings facing the pump ring cavity.

8. The pump chamber structure according to claim 7, characterized in that: The air outlet sink groove is provided with a chamfer at its opening facing the pump ring cavity.

9. The pump chamber structure according to claim 1, characterized in that: The air intake trough opening facing the pump chamber is arranged at one end of the air intake trough, and the air intake trough extends away from the air intake trough body at the air intake trough opening to form a guide groove, and the guide groove is connected to the pump chamber as a whole.

10. The pump chamber structure according to claim 9, characterized in that: The upper and lower end surfaces of the pump ring are also correspondingly provided with air outlet grooves, and the air outlet grooves on the upper and lower end surfaces of the pump ring are interconnected through channels in the side walls of the pump ring, and the air outlet groove has an air outlet groove opening facing the pump ring cavity, and the air inlet groove opening of the air inlet groove facing the pump chamber is arranged at one end of the air inlet groove away from the air outlet groove.

11. An electronic vacuum pump, characterized in that: It includes a motor assembly, a base, a pump body cover, a vane assembly and a pump chamber structure as described in any one of claims 1 to 10, wherein the vane assembly is installed in the pump chamber, the pump chamber structure and the motor assembly are respectively installed on both sides of the base, and the pump chamber structure and the base are sealed.

12. The electronic vacuum pump according to claim 11, characterized in that: The bottom plate of the pump chamber structure is sealed and matched with the base through a sealing ring.

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