CN108626414B

CN108626414B - Electronic expansion valve of air conditioning system for vehicle

Info

Publication number: CN108626414B
Application number: CN201710181869.4A
Authority: CN
Inventors: 朱方英; 王定军
Original assignee: Zhejiang Dunan Machinery Co Ltd
Current assignee: Zhejiang Dunan Machinery Co Ltd
Priority date: 2017-03-24
Filing date: 2017-03-24
Publication date: 2021-08-31
Anticipated expiration: 2037-03-24
Also published as: CN108626414A

Abstract

The invention provides an electronic expansion valve of an air conditioning system for a vehicle. The electronic expansion valve for the vehicle air conditioning system comprises a valve body, a rotor assembly and a valve seat assembly, wherein the rotor assembly is installed on the valve seat assembly, an inlet channel, an outlet channel and a middle channel communicated with the inlet channel and the outlet channel are arranged on the valve body, the valve seat assembly is detachably installed and fixed in the middle channel, the valve seat assembly comprises a valve seat and a supporting seat which are fixedly connected together after being formed in a separated mode, the valve seat comprises a valve port and a communicating channel communicated with the inlet channel, the rotor assembly comprises a valve needle matched with the valve port, the valve body is provided with a first thread located in the middle channel, and the supporting seat is provided with a second thread matched with the first thread in a screwing mode. According to the electronic expansion valve of the vehicle air conditioning system, the problems that in the prior art, the valve seat and the valve port of the electronic expansion valve are integrally processed and formed, the forming difficulty is high, and the processing precision of parts is difficult to guarantee are solved.

Description

Electronic expansion valve of air conditioning system for vehicle

Technical Field

The invention relates to the technical field of expansion valves, in particular to an electronic expansion valve of an air conditioning system for a vehicle.

Background

The electronic expansion valve is arranged between the liquid receiver and the evaporator and is the dividing point of high pressure and low pressure of the air-conditioning refrigeration system. The function is as follows: the high pressure liquid refrigerant from the receiver is throttled to reduce pressure and the amount of liquid refrigerant entering the evaporator is regulated and controlled to accommodate changes in refrigeration compliance. The driving mode of the electronic expansion valve is that the controller calculates parameters acquired by the sensor, sends a regulating instruction to the drive plate, outputs an electric signal to the electronic expansion valve by the drive plate, and then drives the rotor component of the electronic expansion valve to rotate through the coil, so that the valve needle moves up and down, the throttling area of the valve port of the electronic expansion valve is regulated, and the control of the refrigerating capacity is realized.

The electronic expansion valve is widely used in the household air conditioner, the valve body and the pipeline are directly welded in a furnace, and the household air conditioner is relatively stable in use environment, so that the welding mode can adapt to use requirements. However, the electronic expansion valve for the vehicle is complex in use working condition, and the use working condition is influenced by different road conditions and different temperature environments, so that the vibration resistance performance is very important for the vehicle product.

In the chinese invention patent application of the company of three-flower sharps, application number "201510201696.9", an electronic expansion valve is disclosed, which comprises a valve needle matched with a valve port, in order to balance the pressure difference between the front and the back of the valve needle, and facilitate the action of the valve needle, but the valve needle passes through the valve port for a long distance and is matched with the valve body, and the valve needle is slender and difficult to process.

Disclosure of Invention

The invention aims to provide an electronic expansion valve of an air conditioning system for a vehicle, which solves the problem that a valve needle of the electronic expansion valve in the prior art is slender and difficult to process.

An electronic expansion valve of an air conditioning system for a vehicle is characterized by comprising a valve body, a rotor assembly and a valve seat assembly, wherein the rotor assembly is arranged on the valve seat assembly, the valve body is provided with an inlet channel, an outlet channel and a middle channel communicated with the inlet channel and the outlet channel, the valve seat assembly is detachably arranged and fixed in the middle channel and comprises a valve seat, the valve seat comprises a valve port and a communication channel communicated with the inlet channel, the rotor assembly comprises a valve needle matched with the valve port, the inner periphery of the valve seat comprises a third guide part, and the valve needle is matched with the third guide part in a guiding manner and is axially sealed to form an upper cavity and a lower cavity; the valve seat assembly is matched with the valve body to form an annular channel, and the annular channel is communicated with the outlet channel; the annular channel is sealed from the inlet channel and also from the outside; the annular channel is communicated with the inner cavity of the rotor and the upper cavity where the valve needle is located.

According to the electronic expansion valve for the vehicle air conditioning system, the valve needle does not need to penetrate through the valve port to be matched with the valve body, and the processing difficulty is reduced.

Drawings

Fig. 1 is a perspective view schematically illustrating an electronic expansion valve of an air conditioning system for a vehicle according to an embodiment of the present invention;

FIG. 2 is a front view schematically illustrating an electronic expansion valve of an air conditioning system for a vehicle according to an embodiment of the present invention;

FIG. 3 schematically shows a sectional structural view in the direction A-A according to FIG. 2;

fig. 4 is a perspective view schematically illustrating a valve body of an electronic expansion valve of an air conditioning system for a vehicle according to an embodiment of the present invention;

fig. 5 is a sectional structural view schematically illustrating a valve body of an electronic expansion valve for a vehicle air conditioning system according to an embodiment of the present invention;

fig. 6 is a perspective view schematically illustrating a valve seat assembly of an electronic expansion valve for a vehicle air conditioning system according to an embodiment of the present invention;

FIG. 7 is a half sectional view schematically illustrating a valve seat assembly of an electronic expansion valve for a vehicle air conditioning system according to an embodiment of the present invention;

fig. 8 is a half sectional view schematically showing a valve seat of an electronic expansion valve of an air conditioning system for a vehicle according to an embodiment of the present invention.

Reference numbers in the figures: 1. a valve body; 2. a rotor assembly; 3. a valve seat assembly; 4. an inlet channel; 5. an outlet channel; 6. a middle channel; 7. a valve seat; 8. a supporting seat; 9. a valve port; 10. a valve needle; 11. a base body; 12. a transfer sleeve; 13. a first guide portion; 14. a second guide portion; 15. a third guide portion; 16. a screw; 17. a valve needle sleeve; 18. a nut assembly; 19. connecting sheets; 20. a communication channel; 31. an upper chamber 32, a lower chamber; 33. a first balance hole; 34. a second balance hole; 100. a pressure equalization route.

Detailed Description

The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.

Referring to fig. 1 to 8, according to an embodiment of the present invention, an electronic expansion valve for a vehicle air conditioning system includes a valve body 1, a rotor assembly 2 and a valve seat assembly 3, the rotor assembly 2 is mounted on the valve seat assembly 3, the valve body 1 is provided with an inlet passage 4, an outlet passage 5 and a middle passage 6 for communicating the inlet passage 4 and the outlet passage 5, the valve seat assembly 3 is detachably mounted and fixed in the middle passage 6, the valve seat assembly 3 includes a valve seat 7 and a support seat 8 which are fixedly connected together after being formed separately, the valve seat 7 includes a valve port 9 and a communication passage 20 communicated with the inlet passage 4, the rotor assembly 2 includes a valve needle 10 which is engaged with the valve port 9, the valve body 1 is provided with a first thread which is located in the middle passage 6 and extends inward from an outer surface of the valve body, and the support seat 8 is provided with a second thread which is engaged with the first thread in a screwing manner. Of course, the valve seat assembly may be unitary. The inner periphery of the valve seat 7 comprises a third guide part 15, and the valve needle 10 is in guide fit with the third guide part 15 and axially seals to form an upper cavity 31 and a lower cavity 32; the valve seat component 3 is matched with the valve body to form an annular channel 30, and the annular channel 30 is communicated with the outlet channel 5; said annular channel 30 is sealed from the inlet channel 4 and also from the outside; the annular channel 30 communicates between the rotor bore and the upper chamber 31 in which the needle 10 is located, referred to the pressure balance path 100.

Preferably, the communication passages 20 are uniformly distributed along the circumferential direction of the valve seat 7, so as to increase the flow area of the refrigerant.

The electronic expansion valve of the vehicle air conditioning system further comprises a nut component 18 and a shell, wherein the nut component 18 and the shell are both fixedly connected to the supporting seat 8, the rotor assembly 2 is in running fit with the nut component 18, and the rotor assembly 2 is rotatably arranged in the shell relative to the nut component 18. The nut component 18 and the supporting seat 8 are fixedly connected through a connecting sheet 19. The connecting piece 19 can form stable connection between the nut component 18 and the supporting seat 8, so that the nut component is ensured not to rotate relative to the supporting seat 8, when the rotor assembly 2 rotates relative to the nut component 18, the rotation between the nut component 18 and the rotor assembly 2 can be converted into axial movement of the rotor assembly 2, and the adjustment of the opening area between the valve needle 10 and the valve port 9 is realized.

According to the electronic expansion valve of the vehicle air conditioning system, the valve seat assembly 3 comprises the valve seat 7 and the supporting seat 8 which are fixedly connected together after being formed separately, and the valve seat 7 and the supporting seat 8 can be processed separately, so that the forming difficulty of the valve seat 7 and the supporting seat 8 can be reduced, the part processing precision is improved, and the processing cost is reduced. In addition, because disk seat 7 and supporting seat 8 separately process, can be according to disk seat subassembly 3 self structure with disk seat 7 and supporting seat 8 divide into two parts that are convenient for process to reduce the processing degree of difficulty, improve machining precision and machining efficiency.

After separating processing with disk seat 7 and supporting seat 8, just can realize through supporting seat 8 with nut component 18 and valve body 1 between fixed connection to realize different functions respectively through disk seat 7 and supporting seat 8, simplify the function that disk seat 7 and supporting seat 8 self have, just also correspondingly reduced the processing degree of difficulty and the complexity of manufacturing procedure of disk seat 7 and supporting seat 8 self.

Preferably, the supporting base 8 comprises a base body 11 and an adapter sleeve 12, and the base body 11 and the adapter sleeve 12 are fixedly connected after being separately molded. Because the supporting seat 8 itself needs to be connected and fixed with the nut component 18 and the valve body, the supporting seat 8 can be continuously decomposed according to two connection functions to be realized by the supporting seat 8, so that the supporting seat 8 becomes two parts with simpler structures, the processing difficulty of the supporting seat 8 is further reduced, and the processing precision of the supporting seat 8 is improved. Preferably, the adapter sleeve 12 is made of sus304, which can facilitate the welding fixation with the seat body 11. In this embodiment, the supporting seat 8 is divided into a seat body 11 fixedly connected to the valve body 1 and an adapter sleeve 12 respectively engaged with the nut component 18 and the housing, so as to simplify the processing difficulty of the seat body 11 and the adapter sleeve 12 as a whole and improve the processing efficiency thereof.

Of course, if the supporting seat 8 itself has a plurality of connecting structures to be realized, the supporting seat 8 may be disassembled into more components to be combined, but in this way, the accumulated error of the components after combination is too large, which causes the structural accuracy of the supporting seat 8 formed finally to be greatly affected, and the assembling process may be increased, and the processing efficiency may be reduced, so that when the supporting seat 8 is processed, the supporting seat 8 may be disassembled according to the basic function to be realized by the supporting seat 8, so that the problem of too many parts may not be generated while the structure of the supporting seat 8 is more simplified.

Preferably, the valve seat 7 has a first guide portion 13 fitted with the nut component 18, and the first guide portion 13 is located on the outer periphery of one end of the valve seat 7 near the nut component 18. The nut component 18 is sleeved on the periphery of the valve seat 7 and forms guiding fit with the first guiding portion 13, so that the coaxiality of the nut component 18 and the valve seat 7 can be ensured, the guiding precision of the valve needle 10 during movement is improved, and the deviation phenomenon of the valve needle 10 during movement is prevented.

Preferably, the rotor assembly 2 further comprises a screw 16 and a needle sleeve 17, the needle 10 is arranged in the needle sleeve 17 and extends from one end of the needle sleeve 17, the screw 16 extends into the needle sleeve 17 from the other end of the needle sleeve 17 and is in driving connection with the needle 10, and the inner periphery of the valve seat 7 is provided with a second guide portion 14 for guiding the movement of the needle sleeve 17. Because the first guide part 13 and the second guide part 14 are both processed on the valve seat 7, the coaxiality between the first guide part 13 and the second guide part 14 is easier to ensure, so that the installation of the nut assembly 18 is guided through the first guide part 13, the movement of the valve needle sleeve 17 is guided through the second guide part 14, and further the movement of the valve needle 10 is guided, the coaxiality between the nut assembly 18 and the valve needle 10 can be effectively ensured, the coaxiality between the screw 16 and the valve needle 10 is further ensured, and the movement precision of the valve needle 10 is ensured.

The inner periphery of the valve seat 7 in the figure further comprises a third guide part 15 which is matched with the second guide part 14 to form a stepped hole, the valve needle 10 comprises a small-diameter section and a large-diameter section, and the valve needle 10 is matched with the third guide part 15 in a guiding mode through the small-diameter section. In the figure, the third guide part 15 is still arranged on the valve seat 7, so that the coaxiality among the first guide part 13, the second guide part 14 and the third guide part 15 is easier to ensure when the valve seat 7 is machined, the machining precision is improved, and the machining difficulty is reduced. Similarly, guiding the small-diameter section of the valve needle 10 by the third guide portion 15 is also more beneficial to ensure the matching precision between the nut assembly 18, the screw 16 and the valve needle 10. The valve needle 10 passes through the third guide part 15 on the valve seat 7 to be matched with the valve port 9, so that the influence of turbulent flow on the valve needle 10 can be effectively reduced, the movement stability of the valve needle 10 is improved, and the noise of a refrigerant is reduced.

The cross-sectional area of the small diameter section of the valve needle 10 is less than or equal to 5 times the equivalent area of the valve port 9. Preferably, the cross-sectional area of the small diameter section of the valve needle 10 is less than or equal to 3 times of the equivalent area of the valve port 9, so that the turbulent flow area can be reduced, the influence of turbulent flow on the valve needle 10 is surprisingly not reduced, and the stability and the reliability of the valve needle 10 during operation are improved.

The valve seat 7 is inversely arranged on the supporting seat 8 from bottom to top and is fixed by laser or argon arc welding. The periphery of the valve seat 7 is provided with the stopping step, and after the valve seat 7 is loaded into the supporting seat 8 from bottom to top, the mounting position of the supporting seat 8 is stopped and positioned by the stopping step, so that the accuracy of the mounting position of the supporting seat 8 is ensured. After the valve seat 7 is installed in the supporting seat 8, the valve seat 7 and the supporting seat 8 can be welded and fixed in a laser or argon arc mode, and then the valve seat 7 and the supporting seat 8 are integrally installed in the middle channel 6 on the valve body 1.

The adapter sleeve 12 and the seat body 11 can also be fixedly connected together by brazing, or the valve seat 7, the adapter sleeve 12 and the seat body 11 can be fixedly connected together by brazing.

The annular channel (30) is communicated with the inner cavity of the rotor through a first balance hole of the valve seat assembly and is communicated with an upper cavity (31) where the valve needle (10) is located through a second balance hole in the nut in sequence, namely a pressure balance route 100.

The diameter D1 of the valve needle (10) and the third guide part (15) in guiding fit is approximately equal to the diameter D2 of the valve port (9), and when the valve needle flows in all directions, the pressures on both sides of the valve needle sealing part are basically balanced, and the electronic expansion valve is easy to open under high pressure, refer to CN 104180567A.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve of an air conditioning system for a vehicle is characterized by comprising a valve body (1), a rotor assembly (2) and a valve seat assembly (3), wherein the rotor assembly (2) is installed on the valve seat assembly (3), an inlet channel (4), an outlet channel (5) and a middle channel (6) communicated with the inlet channel (4) and the outlet channel (5) are arranged on the valve body (1), the valve seat assembly (3) is detachably installed and fixed in the middle channel (6), the valve seat assembly (3) comprises a valve seat (7), the valve seat (7) comprises a valve port (9) and a communication channel (20) communicated with the inlet channel (4), the rotor assembly (2) comprises a valve needle (10) matched with the valve port (9), and the inner periphery of the valve seat (7) comprises a third guide part (15), the valve needle (10) is matched with the third guide part (15) in a guide way and is axially sealed to form an upper cavity (31) and a lower cavity (32); the valve seat assembly (3) is matched with the valve body to form an annular channel (30), and the annular channel (30) is communicated with the outlet channel (5); the annular channel (30) is sealed from the inlet channel (4) and also from the outside; the annular channel (30) is communicated with the inner cavity of the rotor and the upper cavity (31) where the valve needle (10) is located.

2. An electronic expansion valve for a vehicle air conditioning system according to claim 1, wherein the valve seat assembly (3) further comprises a support base (8), and the valve seat (7) and the support base (8) are separately formed and then fixedly connected together.

3. The electronic expansion valve for a vehicle air conditioning system according to claim 2, wherein the supporting base (8) comprises a base body (11) and an adapter sleeve (12), and the base body (11) and the adapter sleeve (12) are separately molded and then fixedly connected.

4. An electronic expansion valve for a vehicle air conditioning system according to claim 1, wherein the valve seat (7) has a first guide portion (13) fitted with a nut, and the first guide portion (13) is located on the outer periphery of the valve seat (7) near one end of the nut.

5. The electronic expansion valve of the vehicle air conditioning system according to claim 1, wherein the rotor assembly (2) further comprises a screw rod (16) and a valve needle sleeve (17), the valve needle (10) is disposed in the valve needle sleeve (17) and extends out from one end of the valve needle sleeve (17), and the screw rod (16) extends into the valve needle sleeve (17) from the other end of the valve needle sleeve (17) and is in driving connection with the valve needle (10).

6. The electronic expansion valve for a vehicle air conditioning system according to claim 5, wherein the inner periphery of the valve seat (7) further comprises a second guide portion (14) engaged with the valve needle housing (17), the second guide portion (14) having a diameter larger than that of the third guide portion (15) and being on the side close to the screw (16); the valve needle (10) comprises a small-diameter section and a large-diameter section, and the valve needle (10) is in guiding fit with the third guiding part (15) through the small-diameter section.

7. The electronic expansion valve of vehicle air conditioning system according to claim 6, wherein the cross-sectional area of the small diameter section of the valve needle (10) is less than or equal to 5 times the equivalent area of the valve port (9).

8. The electronic expansion valve of vehicle air conditioning system according to claim 7, wherein the cross-sectional area of the small diameter section of the valve needle (10) is less than or equal to 3 times the equivalent area of the valve port (9).

9. The electronic expansion valve of the vehicle air conditioning system according to claim 1, wherein the annular channel (30) is communicated with the inner cavity of the rotor through a first balance hole of the valve seat assembly, and is communicated with the upper cavity (31) where the valve needle (10) is located through a second balance hole of the nut in sequence.

10. The electronic expansion valve for vehicle air conditioning system according to claim 1, wherein the diameter D1 of the valve needle (10) and the third guide portion (15) in guiding engagement is substantially equal to the diameter D2 of the valve port (9).