Electronic expansion valve of vehicle air conditioning system and installation method of electronic expansion valve

Abstract

The invention relates to air-conditioning refrigeration equipment, in particular to an electronic expansion valve of a vehicle air-conditioning system and a mounting method of the electronic expansion valve. An electronic expansion valve of a vehicle air conditioning system comprises a valve body, a valve seat component and a rotor assembly, the valve seat component is detachably installed on the valve body, the rotor assembly is installed on the valve seat component, the valve body is provided with a middle channel, the valve seat component is arranged in the middle channel, the valve seat component is provided with a valve port, and the rotor assembly can axially move to adjust the opening degree of the valve port. The valve seat component comprises a branch valve seat and a supporting seat, the valve seat and the supporting seat are fixedly connected after being machined and formed in a split mode, the valve port is formed in the valve seat, a stop step is arranged on the outer side face of the valve seat, the valve seat is arranged at the bottom of the supporting seat, one end of the valve seat extends into the supporting seat, and the stop step and the inner wall of the supporting seat are located in a matched mode. The method has the advantages that the machining difficulty is reduced, and the machining precision and the machining efficiency are improved.

Description

[0001] This application is a divisional application of a Chinese invention patent application with the application number 201610898126.4, the application date of October 14, 2016, and the title of "An Electronic Expansion Valve for a Vehicle Air Conditioning System". Technical Field

[0002] The present invention relates to air conditioning refrigeration equipment, and in particular to an electronic expansion valve for a vehicle air conditioning system and an installation method thereof. Background Art

[0003] The electronic expansion valve is installed between the liquid receiver and the evaporator and is the demarcation point between the high pressure and the low pressure of the air conditioning refrigeration system. Its functions are: throttling and decompressing the high-pressure liquid refrigerant from the liquid receiver, regulating and controlling the amount of liquid refrigerant entering the evaporator to adapt to the change of refrigeration load. The driving mode of the electronic expansion valve is that the controller calculates the parameters collected by the sensor, sends an adjustment instruction to the driving board, the driving board sends an adjustment instruction, the driving board outputs an electrical signal to the electronic expansion valve, and then drives the rotor component of the electronic expansion valve to rotate through the coil, realizing the up and down movement of the valve needle, adjusting the throttling area of the valve port of the electronic expansion valve, thereby realizing the control of the refrigeration capacity.

[0004] In the prior art, the nut of the electronic expansion valve is installed on the valve body by welding. Since the welding of the nut needs to be carried out after the overall assembly of the electronic expansion valve, the process is relatively complex, and the welding quality is difficult to guarantee. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an electronic expansion valve for a vehicle air conditioning system, simplify the nut installation process, and improve the installation quality.

[0006] To solve the above technical problem, the present invention adopts the following technical solution: An electronic expansion valve for a 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 includes an inlet passage, an outlet passage, and an intermediate passage connecting the inlet passage and the outlet passage. The valve seat component is fixedly installed in the intermediate passage. The valve seat component includes a valve seat. The valve seat is provided with a valve port communicating with the outlet passage and a through hole communicating with the inlet passage. The rotor assembly includes a valve needle cooperating with the valve port. A nut is screwed on the outside of the valve needle, and the nut is fixed on the valve seat by a screw. The valve seat is provided with a guiding portion, and the bottom of the nut is sleeved on the guiding 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] Preferably, a connecting piece is integrally injection-molded at the bottom of the nut, and the screw passes through the connecting piece to fix the nut on the valve seat.

[0009] Preferably, the guiding part is a guiding sleeve that is integrally formed with the valve seat or is separately provided from the valve seat.

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

[0011] Preferably, a support seat that is separately formed and then fixed together with the valve seat is provided on the valve seat, and the nut is fixed on the support seat by screws.

[0012] Preferably, the support seat includes a seat body and an adapter sleeve, and the seat body and the adapter sleeve are fixedly connected after being separately formed.

[0013] Preferably, the valve body is provided with a first thread in the intermediate passage, and the seat body is provided with a second thread that is screwed tightly with the first thread.

[0014] Preferably, the valve seat is installed upside down on the support seat from bottom to top and is fixed by laser or argon arc welding.

[0015] Preferably, brazing is performed between the adapter sleeve and the seat body, or brazing is performed between the valve seat, the adapter sleeve and the seat body.

[0016] The technical solution adopted by the present invention is that the nut is directly fixed on the valve seat by screws, avoiding cumbersome welding processes and improving the quality and reliability of installation. Moreover, further, in order to facilitate the positioning of the nut, the inner hole at the bottom of the nut is sleeved on the guiding part of the valve seat, so that the nut can be easily fixed by screws. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0019] Figure 2 is a schematic structural diagram of Embodiment 2 of the present invention;

[0020] Figure 3 is a schematic structural diagram of Embodiment 3 of the present invention;

[0021] Figure 4 is a schematic structural diagram of Embodiment 4 of the present invention;

[0022] Figure 5 is a schematic structural diagram of Embodiment 5 of the present invention.

[0023] Reference numerals in the drawings: 1, valve body; 2, rotor assembly; 3, valve seat component; 4, inlet passage; 5, outlet passage; 6, intermediate passage; 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 rod; 17, valve needle sleeve; 18, nut assembly; 19, connecting piece; 20, communication passage. Detailed implementation mode

[0024] The following will describe the embodiments of the present invention in detail. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0025] Embodiment 1, as Figure 1 shown, an electronic expansion valve for a vehicle air conditioning system includes a valve body 1, a rotor assembly 2 and a valve seat component 3. The rotor assembly 2 is installed on the valve seat component 3. The valve body 1 is provided with an inlet passage 4, an outlet passage 5 and an intermediate passage 6 connecting the inlet passage 4 and the outlet passage 5. The valve seat component 3 is detachably installed and fixed in the intermediate passage 6. The valve seat component 3 includes a valve seat 7 and a support seat 8 which are fixedly connected together after being separately formed. The valve seat 7 includes a valve port 9 and a communication passage 20 communicating with the inlet passage 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 in the intermediate passage 6, and the support seat 8 is provided with a second thread that is screwed and matched with the first thread.

[0026] There are multiple communication passages 20, which are evenly distributed along the circumferential direction of the valve seat 7, so as to increase the flow area of the refrigerant.

[0027] The electronic expansion valve for the vehicle air conditioning system further includes a nut assembly 18 and a housing. Both the nut assembly 18 and the housing are fixedly connected to the support seat 8. The rotor assembly 2 is rotatably matched with the nut assembly 18, and the rotor assembly 2 is rotatably arranged in the housing relative to the nut assembly 18. The nut assembly 18 and the support seat 8 are fixedly connected by a connecting piece 19. Through the connecting piece 19, a stable connection can be formed between the nut assembly 18 and the support seat 8, so as to ensure that the nut assembly 18 does not rotate relative to the support seat 8. When the rotor assembly 2 rotates relative to the nut assembly 18, the rotation between the nut assembly 18 can be converted into the axial movement of the rotor assembly 2, so as to adjust the opening area between the valve needle 10 and the valve port 9. The valve needle assembly slides in the inner hole of the valve seat, and the inner hole of the nut is sleeved with the valve seat to achieve high-precision guidance. Of course, the valve needle assembly can also slide in the inner hole of the nut, and then the nut is sleeved with the valve seat to achieve high-precision guidance.

[0028] Among them, the connecting piece 19 and the nut are integrally injection-molded. A positioning platform for positioning the connecting piece is provided on the support seat 8. The screw 14 passes through the connecting piece 19 to fix the nut on the positioning platform of the support seat 8. Since the nut is directly fixed on the support seat by the screw 14, the cumbersome welding process is avoided, and the installation quality and reliability are improved.

[0029] For the electronic expansion valve of the vehicle air conditioning system of the present invention, the valve seat component 3 includes a valve seat 7 and a support seat 8 that are fixedly connected together after being separately formed. The valve seat 7 and the support seat 8 can be separately processed, so that the forming difficulty of the valve seat 7 and the support seat 8 can be reduced, the machining accuracy of the parts can be improved, and the processing cost can be reduced. In addition, since the valve seat 7 and the support seat 8 are separately processed, the valve seat 7 and the support seat 8 can be divided into two parts that are convenient for processing according to the structure of the valve seat component 3 itself, thereby reducing the processing difficulty, improving the machining accuracy and processing efficiency.

[0030] After the valve seat 7 and the support seat 8 are separately processed, the fixed connection with the nut assembly 18 and the valve body 1 can be realized through the support seat 8, so that different functions can be realized through the valve seat 7 and the support seat 8 respectively, the functions of the valve seat 7 and the support seat 8 themselves are simplified, and accordingly the processing difficulty of the valve seat 7 and the support seat 8 themselves and the complexity of the processing process are reduced.

[0031] Preferably, the support seat 8 includes a seat body 11 and a transition sleeve 12, and the seat body 11 and the transition sleeve 12 are fixedly connected after being separately formed. Since the support seat 8 itself needs to realize the connection and fixation with both the nut assembly 18 and the valve body, the support seat 8 can be further disassembled according to the two connection functions to be realized by the support seat 8, so that it becomes two components with simpler structures, thereby further reducing the processing difficulty of the support seat 8 and improving the machining accuracy of the support seat 8. Preferably, the transition sleeve 12 is made of sus304, which is convenient for realizing the welding fixation with the seat body 11. In this embodiment, the support seat 8 is disassembled into a seat body 11 fixedly connected to the valve body 1 and a transition sleeve 12 respectively cooperating with the nut assembly 18 and the housing, thereby simplifying the overall processing difficulty of the seat body 11 and the transition sleeve 12 and improving the processing efficiency.

[0032] Of course, if the support seat 8 itself has more connection structures to be realized, the support seat 8 can also be disassembled into more components and then combined. However, in this case, the cumulative error after the combination of these components will be too large, resulting in a greater impact on the structural accuracy of the finally formed support seat 8, and the assembly process will be increased and the processing efficiency will be reduced. Therefore, when processing the support seat 8, the support seat 8 can be disassembled according to the basic functions to be realized by the support seat 8, so that the structure of the support seat 8 is more simplified without causing the problem of too many parts.

[0033] Among them, for the convenience of positioning the nut, the valve seat 7 is provided with a guiding portion, and the inner hole at the bottom of the nut is sleeved on the guiding portion. In this embodiment, the guiding portion is a guiding sleeve 13 integrally provided with the valve seat. The valve seat extends upward to form the guiding sleeve 13, and a guiding fit is formed between the guiding sleeve 13 and the nut, which can ensure the coaxiality of the fit between the nut assembly 18 and the valve seat 7, improve the guiding accuracy during the movement of the valve needle 10, and prevent the valve needle 10 from deviating during the movement process.

[0034] The rotor assembly 2 further includes a screw 16 and a valve needle sleeve 17. The valve needle 10 is movably arranged in the valve needle sleeve 17 and extends out from one end of the valve needle sleeve 17. The screw 16 extends into the valve needle sleeve 17 from the other end of the valve needle sleeve 17 and is drivingly connected to 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, which can reduce the turbulent flow area, thereby reducing the influence of turbulent flow on the valve needle 10 and improving the stability and reliability of the valve needle 10 during operation.

[0036] The valve seat 7 is installed upside down on the support seat 8 from bottom to top and fixed by laser or argon arc welding. A stop step is provided on the outer periphery of the valve seat 7. After the valve seat 7 is installed into the support seat 8 from bottom to top, the installation position of the support seat 8 is stopped and positioned by the stop step, so as to ensure the accuracy of the installation position of the support seat 8. After the valve seat 7 is installed into the support seat 8, the valve seat 7 and the support seat 8 can be welded and fixed by means such as laser or argon arc, and then the whole is installed into the middle channel 6 on 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] Embodiment 2, as Figure 2 shown, different from Embodiment 1, in this embodiment, the connecting piece can be not provided, the bottom of the nut is provided with a positioning flange 15, and the support seat 8 is provided with a positioning platform for positioning the positioning flange 15. The screw 14 passes through the positioning flange 15 to fix the nut on the positioning platform of the support seat 8. Since the connecting piece is not provided, the process can be simplified.

[0039] Embodiment 3, as Figure 3 shown, different from Embodiment 1, the guiding sleeve 13 and the valve seat 7 can be separately provided, and the guiding sleeve is a separate structure, so that the height of the guiding sleeve can be lengthened as required, and the valve seat does not need to extend upward to form the guiding sleeve, thereby reducing the processing cost of the valve seat.

[0040] Embodiment 4, as Figure 4As shown, the valve seat 7 is an aluminum valve seat, and the 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. Thereby, the processing cost of the steel valve seat is reduced. The adapter sleeve 12 is an easily weldable steel and is brazed to the valve seat assembly. Moreover, the guide sleeve 13 can be provided separately or integrally with the valve seat 7.

[0041] Embodiment 5, as Figure 5 shown, is different from Embodiment 1 in that the seat body 11 of the support seat 8 and the adapter sleeve 12 are of an integral structure.

[0042] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electronic expansion valve for a vehicle air conditioning system, comprising a valve body (1), a valve seat component (3) and a rotor assembly (2). The valve seat component (3) is detachably mounted on the valve body (1), the rotor assembly (2) is mounted on the valve seat component (3), the valve body (1) has an intermediate passage (6), the valve seat component (3) is disposed in the intermediate passage (6), the valve seat component (3) has a valve port (9), and the rotor assembly (2) can move axially to adjust the opening degree of the valve port (9). It is characterized in that: The valve seat component (3) includes a valve seat (7) and a support seat (8). The valve seat (7) and the support seat (8) are separately processed and formed and then fixedly connected. The valve port (9) is disposed in the valve seat (7). A stop step is provided on the outer side surface of the valve seat (7). The valve seat (7) is disposed at the bottom of the support seat (8), and one end of the valve seat (7) extends into the support seat (8), and the stop step cooperates with the inner wall of the support seat (8) for positioning.

2. An electronic expansion valve for a vehicle air conditioning system 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.

3. An electronic expansion valve for a vehicle air conditioning system according to claim 1, characterized in that: The valve seat (7) is an aluminum valve seat, and the inner wall of the valve port (9) is made of steel.

4. An electronic expansion valve for a vehicle air conditioning system according to claim 3, characterized in that: A steel valve port sleeve is provided in the valve seat (7), and the inner wall of the valve port sleeve encloses the valve port (9).

5. An electronic expansion valve for a vehicle air conditioning system according to claim 1, characterized in that: The electronic expansion valve further includes a nut assembly (18). The nut assembly (18) is rotationally matched with the rotor assembly (2), the nut assembly (18) is connected to the support seat (8), a guiding portion is provided on the valve seat (7), the guiding portion is disposed in the support seat (8), the rotor assembly (2) includes a valve needle assembly, and at least part of the valve needle assembly is disposed in the guiding portion and is in sliding contact with the guiding portion. The bottom inner hole of the nut assembly (18) is sleeved on the guiding portion.

6. The electronic expansion valve for a vehicle air conditioning system according to claim 5, characterized in that: The guiding portion is a guiding sleeve (13). One end of the guiding sleeve (13) extends in a direction away from the valve seat (7) and extends into the bottom inner hole of the nut assembly (18). The guiding sleeve (13) and the valve seat (7) are separately processed and formed.

7. An electronic expansion valve for a vehicle air conditioning system according to claim 5, characterized in that: The valve needle assembly includes a valve needle (10) that cooperates with the valve port (9). The valve needle (10) has a small-diameter section that can extend into the valve port (9), and the cross-sectional area of the small-diameter section is less than or equal to 5 times the equivalent area of the valve port (9).

8. An electronic expansion valve for a vehicle air conditioning system according to claim 5, characterized in that, The electronic expansion valve further includes a housing. The housing is sleeved on at least part of the rotor assembly (2) and is connected to the valve seat component (3). The support seat (8) includes an adapter sleeve (12) and a seat body (11) that are separately processed and formed. The seat body (11) and the valve body (1) are detachably connected, and the adapter sleeve (12) cooperates with the housing and the nut assembly (18) respectively.

9. The electronic expansion valve of a vehicle air conditioning system according to claim 8, characterized in that, The adapter sleeve (12) is made of steel, and the adapter sleeve (12) and the seat body (11) are fixedly connected by brazing.

10. An electronic expansion valve for a vehicle air conditioning system according to claim 1, characterized in that, The inner wall of the middle channel (6) is provided with a first thread, and the outer side surface of the support seat (8) is provided with a second thread. The support seat (8) and the valve body (1) are threadedly connected through the first thread and the second thread.

11. An installation method for an electronic expansion valve of a vehicle air conditioning system, characterized in that, For installing the electronic expansion valve according to any one of claims 1-10, the installation method includes: The valve seat and the support seat are respectively processed and formed; The valve seat is installed on the bottom of the support seat from bottom to top to form a valve seat component; The valve seat and the support seat are fixedly connected; The valve seat component is installed in the middle channel and is detachably connected to the valve body.

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