Backpressure regulating valve of automobile electric compressor

Abstract

The utility model provides an automobile electric compressor backpressure regulating valve which comprises a valve body, a valve core, a base and an elastic reset piece, the valve body is provided with a mounting cavity with an opening in the lower portion, the valve core is movably assembled in the mounting cavity in the axial direction, the base is connected to the opening end of the mounting cavity, and the elastic reset piece is arranged on the base. The elastic reset piece is located between the bottom of the valve element and the top of the base. A first through hole communicated with the mounting cavity is formed in the top of the valve body, a second through hole communicated with the mounting cavity is formed in the side wall of the valve body, a third through hole communicated with the mounting cavity is formed in the base, and a spiral channel extending in the axial direction of the valve element is arranged between the outer wall of the valve element and the inner wall of the mounting cavity. The back pressure regulating valve of the automobile electric compressor is wide in back pressure regulating range, can automatically regulate back pressure according to system pressure changes, can save capillary tubes when in use, and saves cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure regulating valve technical field, specifically, relate to a kind of automobile electric compressor back pressure regulating valve. BACKGROUND

[0002] The refrigeration system of new energy automobile air conditioner is basically same with the refrigeration system of traditional automobile air conditioner, only the original compressor is replaced by electric compressor, and electric compressor mainly adopts scroll structure. Electric compressor is internally installed with back pressure control valve, and its main purpose is to release scroll moving plate refrigerant pressure, to prevent scroll moving plate and static plate from being damaged due to increased resistance after long time use.

[0003] For example, the back pressure control valve for compressor disclosed in patent CN216382026U. The back pressure control valve of this structure has limited back pressure regulating capacity, and can usually only be adjusted within a small set range, cannot adapt to wide range of working conditions, i.e. cannot automatically adjust back pressure according to system pressure change, and cannot be well applied to heat pump system. In addition, the back pressure control valve of this structure must be used in cooperation with capillary tube to control the pressure of back pressure cavity, increasing application cost. SUMMARY

[0004] To overcome at least one defect in the above prior art, the utility model provides a kind of automobile electric compressor back pressure regulating valve, back pressure regulating range is wide, can automatically adjust back pressure according to system pressure change, and capillary tube can be saved when using, save cost.

[0005] The utility model provides a kind of automobile electric compressor back pressure regulating valve: including valve body, valve core, base and elastic reset piece, the installation cavity of lower opening is provided on the valve body, the valve core is movably matched in the installation cavity along the axial direction, the base is connected in the opening end of the installation cavity, and the elastic reset piece is located between the bottom of the valve core and the top of the base;The top of the valve body is provided with the first through-hole that is communicated with the installation cavity, the second through-hole that is communicated with the installation cavity is opened in the side wall of the valve body, the third through-hole that is communicated with the installation cavity is opened in the base, and the spiral channel that extends along the axial direction is arranged between the outer wall of the valve core and the inner wall of the installation cavity.

[0006] Compared with prior art, the automobile electric compressor back pressure regulating valve of the utility model has the following advantages:

[0007] The utility model discloses a valve structure, in the valve core outer wall between the valve body inner chamber wall forms the channel of spiral, it can act as the function of capillary, and is equipped with the second through -hole on the lateral wall of valve body, when using, install the valve on the compressor support, first through -hole communicates with the compressor exhaust cavity, as high pressure gas drainage hole, second through -hole communicates with the compressor back pressure chamber, third through -hole communicates with the compressor suction cavity, when the compressor starts to pressure stable, exhaust cavity high pressure gas, through first through -hole and push valve core to the appropriate position, make spiral channel (hereinafter referred to as capillary) keep the appropriate length, through the gas of capillary and enter back pressure chamber through second through -hole, enter suction cavity through third through -hole, make back pressure chamber keep the appropriate pressure, when the system changes the working condition, exhaust pressure reduces, and elastic reset piece will push valve core upward, make the capillary between first channel and second through -hole lengthen, increase throttling pressure -reducing effect, the capillary between second through -hole and third through -hole shortens, and is used to adjust the pressure of back pressure chamber, when the system changes the working condition, exhaust pressure increases, and higher air pressure will push valve core and compress elastic reset piece downward, make the capillary of first through -hole to second through -hole shorten, reduce throttling pressure -reducing effect, the capillary between second through -hole and third through -hole lengthen, and be used to increase the pressure of back pressure chamber, that is, the whole process back pressure regulation range is wide, and can automatically adjust back pressure chamber pressure according to system pressure variation, thereby can better serve heat pump system use in new energy pure electric car type.

[0008] As an improvement, a spiral groove extending along the axial direction is formed on the outer wall of the valve core. In the improved structure, the spiral groove is formed on the outer wall of the valve core, and when the valve core is fitted into the mounting cavity, a spiral channel is formed between the outer wall of the valve core and the inner wall of the mounting cavity, which can be used as a capillary. Therefore, the external capillary can be omitted during application, saving costs.

[0009] Further improvement, a cross groove is formed on the upper end surface of the valve core, and the corners of the cross groove are arc-shaped, and the first through hole communicates with the cross groove. In the improved structure, the cross groove is formed on the top of the valve core, which can better ensure the communication between the first through hole and the mounting cavity, and ensure the stable performance of the regulating valve.

[0010] Further improvement, the elastic reset member is a cylindrical spring, a first positioning column is formed on the outer convex of the bottom of the valve core, a second positioning column is formed on the outer convex of the top of the base, and the upper and lower ends of the cylindrical spring are respectively sleeved and positioned on the outer ends of the first positioning column and the second positioning column, and the top of the cylindrical spring abuts against the lower end surface of the valve core, and the bottom abuts against the upper end surface of the base. In the improved structure, the two positioning column structures are used to position the cylindrical spring, ensuring that the cylindrical spring stretches and retracts smoothly and is not easy to deviate.

[0011] Further improved, the outer wall of the valve body is concave and provided with an annular channel, and the second through hole is arranged at the bottom of the annular channel. In the improved structure, the annular channel is arranged, so that the second through hole can better communicate with the compressor back pressure cavity. As long as the height position is aligned, any position in the circumferential range can be communicated, and the installation difficulty is reduced.

[0012] Further improved, the valve core is made of plastic material, and a process hole with a lower opening is arranged in the valve core. In the improved structure, the plastic material valve core is convenient to process and form, and the process hole is arranged to effectively reduce the weight of the valve core and better meet the lightweight requirements of vehicle engineering.

[0013] Further improved, a tapered guide surface is arranged on the outer wall of the upper end of the valve body. In the improved structure, the guide surface is arranged to facilitate installation.

[0014] Further improved, an annular mounting groove is arranged on the inner wall of the open end of the valve body, the base is axially fitted in the mounting groove, and the base is welded and fixed with the valve body. In the improved structure, the mounting groove structure makes the installation of the base and the valve body more accurate, and the welding and fixing mode effectively guarantees the structural strength.

[0015] Other improved features and advantages of the present application will be set forth in the following detailed description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the present application can be achieved and obtained by the structures specifically pointed out in the specification and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective view of the automobile electric compressor back pressure regulating valve of the present application;

[0017] Figure 2 is Figure 1 is a half-section schematic view of the automobile electric compressor back pressure regulating valve;

[0018] Figure 3 is a structure view of the valve core in the present application.

[0019] BRIEF DESCRIPTION OF DRAWINGS:

[0020] 1, valve body; 2, valve core; 3, base; 4, elastic reset member; 5, mounting cavity; 6, first through hole; 7, second through hole; 8, third through hole; 9, spiral groove; 10, cross groove; 11, first positioning column; 12, second positioning column; 13, annular channel; 14, process hole; 15, guide surface; 16, mounting groove. DETAILED DESCRIPTION

[0021] First, those skilled in the art should understand that the embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments as needed to adapt to specific application occasions.

[0022] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "fixed", "connected" should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0023] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0024] Reference should be made to Figures 1 to 3As shown, the embodiment of the application discloses a back pressure regulating valve of an automobile electric compressor, which comprises a valve body 1, a valve core 2, a base 3 and an elastic reset part 4, wherein the valve body 1 and the valve core 2 are both cylindrical structures, an installation cavity 5 with an open lower part is arranged in the valve body 1, the valve core 2 is movably arranged in the installation cavity 5 in an axial direction, the base 3 is connected to an open end of the installation cavity 5, and the elastic reset part 4 is located between the bottom of the valve core 2 and the top of the base 3, so that the valve core 2 always has an upward movement trend; in addition, a first through hole 6 in communication with the installation cavity 5 is formed in the top of the valve body 1, a second through hole 7 in communication with the installation cavity 5 is formed in the side wall of the valve body 1, a third through hole 8 in communication with the installation cavity 5 is formed in the base 3, and a spiral channel extending in the axial direction is arranged between the outer wall of the valve core 2 and the inner wall of the installation cavity 5. The spiral channel here has the function of a capillary tube, in use, the valve is installed on a compressor support, the first through hole 6 is in communication with a compressor exhaust cavity and serves as a high-pressure gas drainage hole, the second through hole 7 is in communication with a compressor back pressure cavity, and the third through hole 8 is in communication with a compressor suction cavity; when the compressor starts to stabilize the pressure, the high-pressure gas in the exhaust cavity pushes the valve core 2 to a suitable position through the first through hole 6; the spiral channel (hereinafter referred to as the capillary tube) maintains a suitable length; the gas passing through the capillary tube enters the back pressure cavity through the second through hole 7 and enters the suction cavity through the third through hole 8; the back pressure cavity maintains a suitable pressure; when the system changes the working condition and the exhaust pressure decreases, the elastic reset part 4 will push the valve core 2 upward; the capillary tube between the first through hole and the second through hole 7 becomes longer, and the throttling pressure reduction effect is increased; the capillary tube between the second through hole 7 and the third through hole 8 becomes shorter, and the pressure of the back pressure cavity is adjusted to be smaller; when the system changes the working condition and the exhaust pressure increases, the higher gas pressure will push the valve core 2 downward to compress the elastic reset part 4, the capillary tube between the first through hole 6 and the second through hole 7 becomes shorter, and the throttling pressure reduction effect is reduced; the capillary tube between the second through hole 7 and the third through hole 8 becomes longer, and the pressure of the back pressure cavity is increased, that is, the back pressure regulating range is wide in the whole process, and the back pressure cavity pressure can be automatically adjusted according to the system pressure change, so that the heat pump system can better serve the new energy pure electric vehicle.

[0025] In the embodiment, referring to the accompanying drawings Figure 2 、 3 A spiral groove 9 extending in the axial direction is formed in the outer wall of the valve core 2, so that when the valve core 2 is installed in the installation cavity 5, a spiral channel is formed between the outer wall of the valve core 2 and the inner wall of the installation cavity 5. In the structure, in order to ensure that the valve core 2 can move up and down, a single-sided gap of 0.01-0.015mm is left between the outer wall of the valve core 2 and the inner wall of the installation cavity 5, and the small gap will be sealed by an oil film later.

[0026] In some other embodiments, a spiral groove 9 can also be formed on the inner wall of the mounting cavity 5. Compared with forming a spiral groove 9 on the outer wall of the valve core 2, forming a spiral groove 9 on the inner wall of the mounting cavity 5 is much more difficult to process, resulting in a high scrap rate and significantly increased processing costs. Therefore, this method is not widely used.

[0027] In this embodiment, the depth and width of the spiral groove 9 are both 0.8 mm. In other embodiments, the size of the spiral groove 9 can be varied depending on the type of compressor.

[0028] On the other hand, see Appendix Figure 3 In this embodiment, a cross-shaped groove 10 is provided on the upper surface of the valve core 2, and the corners of the cross-shaped groove 10 are all rounded to increase the opening size at the center of the cross-shaped groove 10. The first through hole 6 is connected to the cross-shaped groove 10. In this structure, a slight deviation in the position of the first through hole 6 will not affect the connection with the spiral channel, and the cross-shaped groove can ensure that the first through hole 6 is connected to the spiral channel from multiple directions.

[0029] See appendix for further details. Figure 2 In this embodiment, preferably, the elastic reset component 4 is a cylindrical spring. The bottom of the valve core 2 is provided with a first positioning post 11 protruding outward, and the diameter of the first positioning post 11 is smaller than the diameter of the valve core 2. The top of the base 3 is formed with a second positioning post 12 protruding outward, and the diameter of the second positioning post 12 is smaller than the diameter of the base 3. Therefore, when the cylindrical spring is installed, the upper and lower ends of the cylindrical spring are respectively fitted and positioned on the outer ends of the first positioning post 11 and the second positioning post 12. The top of the cylindrical spring abuts against the lower end face of the valve core 2, and the bottom abuts against the upper end face of the base 3, effectively ensuring the stability and reliability of the elastic reset structure.

[0030] In other embodiments, the elastic reset member 4 may also be of other forms, such as a rubber bellows or a metal bellows with axial elastic deformation force.

[0031] For others, see Appendix Figure 1 In this embodiment, an annular channel 13 is recessed on the outer wall of the valve body 1 at a position corresponding to the communication port of the compressor back pressure chamber, and the second through hole 7 is located at the bottom of the annular channel 13. With this configuration, the entire back pressure regulating valve can be connected at any position in the circumferential range as long as it is aligned at the height position, reducing the difficulty of installation.

[0032] In this embodiment, the valve core 2 is made of plastic, and a process hole 14 with a lower opening is provided inside the valve core 2. The plastic valve core 2 is easy to process and mold, and the combination with the process hole 14 effectively reduces the weight of the valve core 2, better meeting the lightweight requirements of vehicle engineering.

[0033] In addition, in order to facilitate the installation of the entire pressure regulating valve on the compressor, a tapered guide surface 15 is arranged on the outer wall of the upper end of the valve body 1, which can play a certain guiding role during installation.

[0034] In another aspect, the valve body 1 and the base 3 are both made of metal, and an annular mounting groove 16 is arranged on the inner wall of the open end of the valve body 1, the base 3 is axially fitted into the mounting groove 16, and the base 3 is welded and fixed with the valve body 1. Specifically, the joint between the base 3 and the mounting groove 16 is fixed by laser welding, and after connection, the lower end surface of the base 3 is flush with the lower end surface of the valve body 1.

[0035] In the description of the present application, the description referring to the terms "the present embodiment", "some embodiments" and the like means that the specific features, mechanisms, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0036] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An automotive electric compressor back pressure regulating valve characterized by: The utility model provides a valve, including valve body (1), valve core (2), base (3) and elastic reset piece (4), the installation cavity (5) of lower opening is arranged on the valve body (1), the valve core (2) is movably fitted in the installation cavity (5) along the axial direction, the base (3) is connected in the opening end of the installation cavity (5), and the elastic reset piece (4) is located between the bottom of valve core (2) and the top of base (3), the top of valve body (1) is provided with first through -hole (6) with the installation cavity (5) intercommunication, the lateral wall of valve body (1) is provided with second through -hole (7) with the installation cavity (5) intercommunication, the base (3) is provided with third through -hole (8) with the installation cavity (5) intercommunication, and the outer wall of valve core (2) and the inner wall of installation cavity (5) are provided with helical channel along its axial direction.

2. The automotive electric compressor back pressure regulating valve according to claim 1, characterized in that: The outer wall of valve core (2) is provided with helical groove (9) extending along its axial direction.

3. The automotive electric compressor back pressure regulating valve according to claim 1 or 2, characterized in that: The upper end surface of valve core (2) is provided with cross groove (10), and the corners of cross groove (10) are all circular arc corners, and first through -hole (6) is communicated with cross groove (10).

4. The automotive electric compressor back pressure regulating valve of claim 1, wherein: The elastic reset piece (4) is cylindrical spring, the bottom of valve core (2) is provided with first positioning column (11) outward, the top of base (3) is provided with second positioning column (12) outward, and the upper and lower ends of cylindrical spring are respectively positioned in the outer end of first positioning column (11) and second positioning column (12), and the top of cylindrical spring is in abutment with the lower end surface of valve core (2), and the bottom is in abutment with the upper end surface of base (3).

5. The automotive electric compressor back pressure regulating valve according to claim 1 or 2 or 4, characterized in that: The outer wall of valve body (1) is provided with annular channel (13) inward, and second through -hole (7) is arranged at the bottom of annular channel (13).

6. The automotive electric compressor back pressure regulating valve of claim 1, wherein: Valve core (2) is made of plastic material, and process hole (14) with lower opening is formed in the inside of valve core (2).

7. The automotive electric compressor back pressure regulating valve according to claim 1 or 6, characterized in that: The outer wall of the upper end of valve body (1) is provided with conical guide surface (15).

8. The automotive electric compressor back pressure regulating valve of claim 1, wherein: The inner wall of the opening end of valve body (1) is provided with annular mounting groove (16), the base (3) is fitted in the mounting groove (16) along the axial direction, and the base (3) is welded with valve body (1).

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