Electronic expansion valve of vehicle air conditioning system

Abstract

The invention relates to air conditioning refrigeration equipment, in particular to an electronic expansion valve of a vehicle air conditioning system. An electronic expansion valve of a vehicle air conditioning system comprises a valve body, a valve seat component detachably installed on the valve body and a rotor assembly installed on the valve seat component, and the valve body comprises an inlet channel, an outlet channel and a middle channel communicated with the inlet channel and the outlet channel. The valve seat component is installed and fixed in the middle channel and comprises a valve seat, the valve seat is provided with a valve port communicated with the outlet channel and a through hole communicated with the inlet channel, the rotor assembly comprises a valve needle matched with the valve port, a nut is screwed on the outer side of the valve needle in a threaded mode, a guide part is arranged on the valve seat, and the guide part is provided with a through hole communicated with the inlet channel. The guide part is a guide sleeve, and an inner hole in the bottom of the nut is connected to the guide sleeve in a sleeved mode and is in guide fit with the guide sleeve.

Description

[0001] The present application is a divisional application of the Chinese Patent Application No. 201610898126.4, filed on October 14, 2016, entitled "Electronic Expansion Valve for Vehicle Air Conditioning System". TECHNICAL FIELD

[0002] The present application relates to air conditioning refrigeration equipment, in particular to an electronic expansion valve for vehicle air conditioning system. BACKGROUND

[0003] The electronic expansion valve is installed between the liquid accumulator and the evaporator, and is the demarcation point between high pressure and low pressure of the air conditioning refrigeration system. Its function is to throttle and reduce the pressure of the high-pressure liquid refrigerant from the liquid accumulator, to adjust and control the amount of liquid refrigerant entering the evaporator, so as to adapt to the changes of refrigeration. The driving mode of the electronic expansion valve is that the controller calculates the parameters collected by the sensor, sends the adjustment instruction to the drive board, and then the drive board outputs the electric signal to the electronic expansion valve. Then the coil drives the rotor component of the electronic expansion valve to rotate, so as to realize the up-down action of the valve needle, adjust the throttling area of the valve port of the electronic expansion valve, and thus realize the control of the refrigeration capacity.

[0004] In the prior art, the nut of the electronic expansion valve is welded on the valve body. Since the nut is welded after the overall assembly of the electronic expansion valve, the process is relatively complex, and the welding quality is difficult to guarantee. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an electronic expansion valve for vehicle air conditioning system, which simplifies the nut installation process and improves the installation quality.

[0006] To solve the above technical problems, the present application adopts the following technical scheme: an electronic expansion valve for vehicle air conditioning system, comprising a valve body, a valve seat component detachably installed on the valve body, and a rotor assembly installed on the valve seat component, the valve body comprising an inlet channel, an outlet channel, and an intermediate channel connecting the inlet channel and the outlet channel, the valve seat component being installed and fixed in the intermediate channel, the valve seat component comprising a valve seat, the valve seat being provided with a valve port communicated with the outlet channel and a through hole communicated with the inlet channel, the rotor assembly comprising a valve needle matched with the valve port, the valve needle being externally screwed with a nut, the nut being fixed on the valve seat by a screw, the valve seat being provided with a guide portion, and the bottom of the nut being sleeved on the guide portion.

[0007] Preferably, the bottom of the nut is provided with a positioning flange, and the screw passes through the positioning flange to fix the nut on the valve seat.

[0008] The bottom of the nut is integrally injection molded with a connecting plate, and the screw passes through the connecting plate to fix the nut on the valve seat.

[0009] The guide part is preferably a guide sleeve which is integrally formed with the valve seat or is separately formed with the valve seat.

[0010] The valve seat is preferably an aluminum valve seat, and the valve port is preferably a steel valve port.

[0011] The valve seat is preferably provided with a support seat which is separately formed and then fixed together, and the nut is fixed on the support seat by a screw.

[0012] The support seat preferably comprises a seat body and an adapter sleeve which are separately formed and then fixedly connected.

[0013] The valve body is preferably provided with a first thread in the intermediate channel, and the seat body is provided with a second thread which is screwed with the first thread.

[0014] The valve seat is preferably inverted from bottom to top on the support seat and is fixed by laser or argon arc welding.

[0015] The adapter sleeve and the seat body are preferably brazed, or the valve seat, the adapter sleeve and the seat body are brazed.

[0016] The nut is directly fixed on the valve seat by a screw, avoiding complicated welding procedures and improving the installation quality and reliability. Furthermore, the bottom inner hole of the nut is sleeved on the guide part of the valve seat to facilitate the positioning of the nut, and the nut can be conveniently fixed by a screw. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be further described below in conjunction with the drawings and specific embodiments:

[0018] Figure 1 The structure of the embodiment 1 of the application is shown in the figure;

[0019] Figure 2 The structure of the embodiment 2 of the application is shown in the figure;

[0020] Figure 3 The structure of the embodiment 3 of the application is shown in the figure;

[0021] Figure 4 The structure of the embodiment 4 of the application is shown in the figure;

[0022] Figure 5 The structure of the embodiment 5 of the application is shown in the figure.

[0023] In the figure, the following are the reference numerals: 1. Valve body; 2. Rotor assembly; 3. Valve seat assembly; 4. Inlet channel; 5. Outlet channel; 6. Intermediate channel; 7. Valve seat; 8. Support seat; 9. Valve port; 10. Valve needle; 11. Seat body; 12. Adapter sleeve; 13. Guide sleeve; 14. Screw; 15. Positioning flange; 16. Screw; 17. Valve needle sleeve; 18. Nut assembly; 19. Connecting piece; 20. Communicating channel; 21. Gap; 22. Groove; 23. First O-ring; 24. Second O-ring; 25. Valve cavity. Detailed Implementation

[0024] The embodiments of the present invention will be described in detail below, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0025] Example 1, as Figure 1 As shown, an electronic expansion valve for an automotive air conditioning system includes a valve body 1, a rotor assembly 2, and a valve seat component 3. The rotor assembly 2 is mounted on the valve seat component 3. The valve body 1 is provided with an inlet channel 4, an outlet channel 5, and an intermediate channel 6 connecting the inlet channel 4 and the outlet channel 5. The valve seat component 3 is detachably installed and fixed in the intermediate channel 6. The valve seat component 3 includes a valve seat 7 and a support seat 8, which are separately formed and then fixedly connected together. The valve seat 7 includes a valve port 9 and a connecting channel 20 communicating with the inlet channel 4. The rotor assembly 2 includes a valve needle 10 that cooperates with the valve port 9. The valve body 1 is provided with a first thread located in the intermediate channel 6, and the support seat 8 is provided with a second thread that is tightened to cooperate with the first thread.

[0026] There are multiple connecting channels 20, which are evenly distributed around the valve seat 7 to increase the flow area of ​​the refrigerant.

[0027] The electronic expansion valve of the automotive air conditioning system also includes a nut assembly 18 and a housing. Both the nut assembly 18 and the housing are fixedly connected to a support base 8. A rotor assembly 2 is rotatably fitted with the nut assembly 18, and the rotor assembly 2 is rotatably disposed within the housing relative to the nut assembly 18. The nut assembly 18 and the support base 8 are fixedly connected by a connecting piece 19. The connecting piece 19 ensures a stable connection between the nut assembly 18 and the support base 8, preventing the nut assembly 18 from rotating relative to the support base 8. This allows the rotor assembly 2 to rotate relative to the nut assembly 18, converting the rotational movement into axial movement, thus adjusting the opening area between the valve needle 10 and the valve port 9. The valve needle assembly slides within the valve seat's inner bore, and the nut's inner bore engages with the valve seat, achieving high-precision guidance. Alternatively, the valve needle assembly can also slide within the nut's inner bore, with the nut engaging with the valve seat for high-precision guidance.

[0028] The connecting piece 19 is integrally injection molded with the nut, the support base 8 is provided with a positioning platform for positioning the connecting piece, and the screw 14 penetrates through the connecting piece 19 to fix the nut on the positioning platform of the support base 8. Since the nut is directly fixed on the support base by the screw 14, the complicated welding process is avoided, and the installation quality and reliability are improved.

[0029] The valve seat part 3 of the electronic expansion valve of the vehicle air conditioning system comprises a valve seat 7 and a support base 8 which are separately molded and fixedly connected together. The valve seat 7 and the support base 8 can be separately processed, so that the molding difficulty of the valve seat 7 and the support base 8 is reduced, the part processing precision is improved, and the processing cost is reduced. In addition, since the valve seat 7 and the support base 8 are separately processed, the valve seat 7 and the support base 8 can be divided into two parts which are convenient to process according to the structure of the valve seat part 3, so that the processing difficulty is reduced, and the processing precision and efficiency are improved.

[0030] After the valve seat 7 and the support base 8 are separately processed, the support base 8 is used to realize the fixed connection between the nut assembly 18 and the valve body 1, so that the valve seat 7 and the support base 8 realize different functions respectively, the functions of the valve seat 7 and the support base 8 are simplified, and the processing difficulty and the complexity of the processing procedure of the valve seat 7 and the support base 8 are reduced.

[0031] Preferably, the support base 8 comprises a seat body 11 and an adapter sleeve 12 which are separately molded and fixedly connected. Since the support base 8 needs to be connected with the nut assembly 18 and the valve body at the same time, the support base 8 can be further decomposed into two parts with simpler structures according to the two connection functions of the support base 8, so that the processing difficulty of the support base 8 is further reduced, and the processing precision of the support base 8 is improved. Preferably, the adapter sleeve 12 is made of sus304, so that the welding between the seat body 11 and the adapter sleeve 12 can be realized. In this embodiment, the support base 8 is decomposed into the seat body 11 which is fixedly connected with the valve body 1 and the adapter sleeve 12 which is cooperated with the nut assembly 18 and the shell, so that the processing difficulty of the seat body 11 and the adapter sleeve 12 is simplified, and the processing efficiency is improved.

[0032] Of course, if the support base 8 needs to realize more connection structures, the support base 8 can be decomposed into more parts and then combined, but in this case, the cumulative error of the parts after combination is too large, the structure precision of the finally molded support base 8 is greatly affected, the assembly procedure is increased, and the processing efficiency is reduced. Therefore, when the support base 8 is processed, the support base 8 can be decomposed according to the basic functions of the support base 8, so that the structure of the support base 8 is simplified without too many parts.

[0033] In order to facilitate positioning of the nut, the valve seat 7 is provided with a guide portion, and the bottom inner hole of the nut is sleeved on the guide portion. In this embodiment, the guide portion is a guide sleeve 13 which is integrally arranged on the valve seat. The valve seat extends upwardly to form the guide sleeve 13, and a guide fit is formed between the guide sleeve 13 and the nut, so as to ensure coaxiality of the fit between the nut assembly 18 and the valve seat 7, improve guiding accuracy during movement of the valve needle 10, and prevent deviation of the valve needle 10 during movement.

[0034] The rotor assembly 2 further comprises a screw rod 16 and a valve needle sleeve 17, the valve needle 10 is movably arranged in the valve needle sleeve 17 and extends 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 drivingly connected with the valve needle 10.

[0035] 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 the equivalent area of the valve port 9, so as to reduce the disturbance area and reduce the influence of disturbance on the valve needle 10, thereby improving stability and reliability of the valve needle 10 during operation.

[0036] The valve seat 7 is invertedly arranged on the support seat 8 from bottom to top and is fixed by laser or argon arc welding. A stop step is arranged on the outer periphery of the valve seat 7, and after the valve seat 7 is arranged in the support seat 8 from bottom to top, the installation position of the support seat 8 is positioned by the stop step, so as to ensure accuracy of the installation position of the support seat 8. After the valve seat 7 is arranged in the support seat 8, the valve seat 7 and the support seat 8 can be fixed by laser or argon arc welding, and then are integrally arranged in the intermediate passage 6 of the valve body 1.

[0037] 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 are fixedly connected together by brazing.

[0038] In an embodiment, please refer to Figure 1 and Figure 2 , the outer wall of the valve seat component 3 and the inner wall of the intermediate passage 6 have a gap 21.

[0039] Specifically, the outer wall of the valve seat component 3 is provided with a groove 22, and the groove 22 and the outer wall of the valve seat component 3 enclose at least part of the gap 21.

[0040] Please refer to Figure 1 , the first O-ring 23 and the second O-ring 24 are arranged between the valve seat component 3 and the valve body 1, and the gap 21 is located between the first O-ring 23 and the second O-ring 24.

[0041] Please refer to Figure 1 and Figure 2The valve seat 7 is provided with a valve cavity 25 that communicates with the communication channel 20. The valve cavity 25 is located on the side of the valve port 9 close to the communication channel 20. The height of the valve cavity 25 along the axial direction of the electronic expansion valve is greater than the height of the communication channel 20 along the axial direction of the electronic expansion valve.

[0042] Example 2, as Figure 2 As shown, the difference from Embodiment 1 is that this embodiment does not require a connecting piece. The bottom of the nut has a positioning flange 15, and the support base 8 has a positioning platform for positioning the positioning flange 15. The screw 14 passes through the positioning flange 15 to fix the nut to the positioning platform of the support base 8. Since no connecting piece is required, the process can be simplified.

[0043] Furthermore, the positioning flange 15 is fitted and connected to the positioning platform.

[0044] Example 3, as Figure 3 As shown, the difference from Embodiment 1 is that the guide sleeve 13 and the valve seat 7 can be set separately. The guide sleeve is a separate structure, so the height of the guide sleeve can be increased as needed. The valve seat does not need to extend upward out of the guide sleeve, thereby reducing the processing cost of the valve seat.

[0045] Example 4, as Figure 4 As shown, valve seat 7 is an aluminum valve seat, and valve port 9 is a steel valve port. Specifically, a steel valve port sleeve is provided at the valve port to form the valve port. This reduces the processing cost of the steel valve seat. The adapter sleeve 12 is made of easy-to-weld steel and is brazed to the valve seat assembly. Moreover, the guide sleeve 13 can be set separately or integrated with the valve seat 7.

[0046] Example 5, as Figure 5 As shown, the difference from Embodiment 1 is that the base 11 of the support 8 and the adapter sleeve 12 are integral structures.

[0047] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electronic expansion valve for vehicle air conditioning system, comprising a valve body (1), a valve seat component (3) detachably mounted on the valve body (1), and a rotor assembly (2) mounted on the valve seat component (3), the valve body (1) comprising an inlet channel (4), an outlet channel (5), and an intermediate channel (6) connecting the inlet channel (4) and the outlet channel (5), the valve seat component (3) being mounted and fixed in the intermediate channel (6), the valve seat component (3) comprising a valve seat (7) provided with a valve port (9) communicating with the outlet channel (5) and a through hole communicating with the inlet channel (4), the rotor assembly (2) comprising a valve needle (10) cooperating with the valve port (9), the valve needle (10) being externally screwed with a nut, characterized in that: the valve seat (7) is provided with a guide portion, which is a guide sleeve (13), the bottom inner hole of the nut is sleeved on the guide sleeve (13), and a guide cooperation is formed between the bottom inner hole of the nut and the guide sleeve (13). The valve seat (7) extends upwardly out of the guide sleeve (13), and the guide sleeve (13) is integrally arranged with the valve seat (7).

2. The electronic expansion valve for an air conditioning system of a vehicle according to claim 1, characterized in that: The guide sleeve (13) is separately arranged with the valve seat (7).

3. The electronic expansion valve for an air conditioning system of a vehicle according to claim 1, characterized in that: The valve seat component (3) further comprises a support seat (8), the support seat (8) and the valve seat (7) are separately formed and then fixed together.

4. The electronic expansion valve for an air conditioning system of a vehicle according to claim 1, characterized in that: The support seat (8) and the valve seat (7) are fixedly connected by laser welding or argon arc welding.

5. The electronic expansion valve of claim 4, wherein: The support seat (8) comprises a seat body (11) and an adapter sleeve (12), the seat body (11) and the adapter sleeve (12) are separately formed and then fixedly connected.

6. The electronic expansion valve for an air conditioning system of a vehicle according to claim 4, characterized in that: The electronic expansion valve further comprises a nut assembly (18) and a shell, the nut assembly (18) and the shell are both fixedly connected to the support seat (8), the nut assembly (18) is rotationally cooperated with the rotor assembly (2), and the rotor assembly (2) is rotationally arranged in the shell relative to the nut assembly (18).

7. The electronic expansion valve of claim 4, wherein: The bottom of the nut is provided with a positioning flange (15), and the valve seat component (3) is provided with a positioning platform for positioning the positioning flange (15).

8. The electronic expansion valve for an air conditioning system of a vehicle according to claim 1, characterized by: The positioning flange (15) is attached to the positioning platform.

9. The electronic expansion valve of claim 8, wherein:

10. The electronic expansion valve for vehicle air conditioning system according to claim 1, characterized in that: The valve seat (7) has a valve port sleeve, and the valve port sleeve forms the valve port (9).

11. The electronic expansion valve for vehicle air conditioning system according to claim 1, characterized in that: The outer wall of the valve seat component (3) and the inner wall of the intermediate channel (6) have a gap (21).

12. The electronic expansion valve for vehicle air conditioning system according to claim 11, characterized in that: The outer wall of the valve seat component (3) is provided with a groove (22), and the groove (22) and the outer wall of the valve seat component (3) enclose at least part of the gap (21).

13. The electronic expansion valve for vehicle air conditioning system according to claim 11, characterized in that: ​ The first O-ring (23) and the second O-ring (24) are arranged between the valve seat component (3) and the valve body (1), and the gap (21) is located between the first O-ring (23) and the second O-ring (24).

14. The electronic expansion valve of claim 1, wherein: The valve seat (7) comprises a communication channel (20) in communication with the inlet channel (4), and a valve cavity (25) in communication with the communication channel (20) is arranged in the valve seat (7), the valve cavity (25) is located on the side of the valve port (9) close to the communication channel (20), and the height of the valve cavity (25) along the axial direction of the electronic expansion valve is greater than the height of the communication channel (20) along the axial direction of the electronic expansion valve.

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