An expansion valve
By designing an expansion valve structure with separate inner and outer valve bodies, the high cost problem caused by the different interfaces of air conditioning manufacturers was solved, and the standardized production of expansion valves and the precision of fluid flow regulation were achieved, reducing production costs and flow resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG SANHUA AUTOMOTIVE COMPONENTS CO LTD
- Filing Date
- 2021-02-02
- Publication Date
- 2026-07-10
AI Technical Summary
Existing expansion valves are difficult to standardize due to the high manufacturing cost caused by the different internal interfaces of air conditioning manufacturers.
Design an expansion valve including an inner valve body and an outer valve body. The inner valve body and the outer valve body are connected by a fixed or limiting connection. The transmission rod component connects the power head assembly and the valve core assembly. The inner valve body can be independent of the outer valve body interface with minimal impact. The outer valve body can be set according to requirements. The inner valve body can be miniaturized and standardized.
Standardized production of expansion valves has been achieved, reducing production costs and improving the accuracy of fluid flow regulation and flow area, while reducing flow resistance.
Smart Images
Figure CN114688258B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of refrigerant fluid control components, and particularly to an expansion valve. Background Technology
[0002] The expansion valve is an important component of the refrigeration system. Its main function is to control the valve opening by sensing the superheat at the evaporator outlet or compressor suction end in the refrigeration system, thereby achieving the purpose of regulating the refrigerant flow and throttling and reducing pressure in the system.
[0003] The internal standards of expansion valve manufacturers and air conditioner factories differ, resulting in variations in the diameter, depth, and spacing of the air conditioner sealing interfaces, leading to diverse interface combinations. To reduce the high manufacturing costs caused by these interface variations, this invention urgently needs to develop a standardized, low-cost expansion valve. Summary of the Invention
[0004] The purpose of this invention is to provide a standardized, low-cost expansion valve.
[0005] The invention provides an expansion valve, including an inner valve body and an outer valve body, which are fixed or limited in position. The inner valve body includes a valve body, a power head assembly, and a transmission rod assembly. The expansion valve includes a valve core assembly and an adjustment assembly. The transmission rod assembly drivesly connects the power head assembly and the valve core assembly. The power head assembly acts on the valve core assembly through the transmission rod assembly, enabling the valve core assembly to move up and down. The outer valve body includes a first interface portion and a second interface portion. The first interface portion has a first interface, and the second interface portion has a second interface. The inner valve body has a first inner interface corresponding to and communicating with the first interface, and a second inner interface corresponding to and communicating with the second interface. The expansion valve has at least two sealing rings between the inner valve body and the outer valve body, and the inner or outer valve body has corresponding sealing grooves. In the axial height direction of the expansion valve, at least one sealing ring is positioned higher than the first inner interface and lower than the second inner interface.
[0006] The expansion valve in this invention can separate the inner and outer valve bodies. The inner valve body is less affected by the interface of the outer valve body. The outer valve body can be set as needed. The inner valve body can be miniaturized and standardized, resulting in a relatively low overall cost. Attached Figure Description
[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0008] Figure 1 This is a cross-sectional schematic diagram of the expansion valve according to the first embodiment of the present invention;
[0009] Figure 2 for Figure 1 A three-dimensional structural diagram of the inner valve body;
[0010] Figure 3 for Figure 1 A front view structural diagram of the inner valve body;
[0011] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the inner valve body along the AA direction.
[0012] Figure 5 for Figure 1 A three-dimensional structural schematic diagram of the valve body shown;
[0013] Figure 6 for Figure 1 A cross-sectional schematic diagram of one embodiment of the external valve body shown;
[0014] Figure 7 for Figure 6 A three-dimensional structural diagram of the external valve body is shown.
[0015] Figure 8 This is a front view of the inner valve body according to the second embodiment of the present invention;
[0016] Figure 9 This is a three-dimensional structural schematic diagram of the third embodiment of the expansion valve;
[0017] Figure 10 for Figure 9 A three-dimensional structural diagram of the outer valve body of the expansion valve shown.
[0018] Figure 11 for Figure 9 The diagram shows the structure of the retaining ring of the expansion valve. Detailed Implementation
[0019] The embodiments will now be described in detail with reference to the accompanying drawings. Numerous specific details are mentioned in the following description to provide a comprehensive understanding of the technical solutions of the present invention. However, those skilled in the art should understand that the present invention can be implemented without these specific details. It should also be understood that the specific components, devices, and features illustrated in the drawings and described herein are merely exemplary and should not be considered limiting.
[0020] The purpose of this invention is to provide an expansion valve comprising an inner valve body and an outer valve body, which are fixedly or partially connected. This fixed or partially connected connection ensures that the inner and outer valve bodies are relatively fixed or partially limited, preventing relative rotational displacement. In this invention, a transmission rod component connects the power head assembly and the valve core assembly. The power head assembly acts on the valve core assembly through the transmission rod component, enabling the valve core assembly to move up and down. Specifically, when the moving part of the power head assembly moves downward, it directly or indirectly abuts against and drives the transmission rod component downward, thus driving the valve core assembly downward. Conversely, when the moving part of the power head assembly moves upward, an elastic element below it causes the valve core assembly to move upward, driving the transmission rod component upward.
[0021] See Figure 1 The present invention provides an expansion valve 10 according to a first embodiment. The expansion valve 10 includes an outer valve body 100 and an inner valve body 200. In this embodiment, the inner valve body 200 includes a valve body 11, a power head assembly 12, a transmission rod component 13, a valve core assembly 14, and an adjustment assembly 15.
[0022] The valve body 11 has an opening at the top. The power head assembly 12 is fixed to the valve body 11 by welding, and the power head assembly 12 is located at the top of the valve body 11. The adjusting assembly 15 is threadedly connected to the valve body 11 and is located near the bottom of the valve body 11. The inner valve body 200 has a valve chamber 16, and the valve core assembly 14 is located in the valve chamber 16. The valve core assembly 14 can change the flow area of the valve port of the expansion valve through the power head assembly 12 and the transmission rod assembly 13, thereby adjusting the flow rate of the fluid passing through the expansion valve. The transmission rod assembly 13 is located in the inner valve body. Internally, the transmission rod component 13 is connected to the power head assembly 12 and the valve core assembly 14. The transmission rod component 13 can abut against the power head assembly 12, including direct and indirect abutment, and the transmission rod component 13 can abut against the valve core assembly 14, including direct and indirect abutment. The transmission rod component 13 can move accordingly when the power head assembly 12 is heated or cooled, thereby abutting and driving the valve core assembly 14 to move up and down, so that the valve core assembly 14 can move up and down a certain distance under the action of the power head assembly 12, so as to adjust the flow area when the fluid flows through the valve port of the expansion valve.
[0023] See Figure 2 and Figure 4The valve body 11 has a generally vertically extending structure and includes a first inner interface 111, a second inner interface 112, a third inner interface 113, and a fourth inner interface 114. The valve body 11 includes a first flow channel 115 and a throttling section 116. The first inner interface 111 is one interface of the first flow channel 115, and the second inner interface 112 is the other interface of the first flow channel 115. In this embodiment, the throttling section 116 has a valve port. The throttling section can cooperate with the valve core assembly to adjust the flow area at the valve port, thereby adjusting the flow rate through the valve port. The valve body 11 also includes a second flow channel 117, with the third inner interface 113 being one interface of the second flow channel 117 and the fourth inner interface 114 being the other interface of the second flow channel 117. In one specific application, fluid flows in through the first inner port 111, is throttled by the valve port of the throttling section, and flows out through the second inner port 112 and the outer valve body. The fluid then flows in again from the outer valve body through the third inner port 113 and out through the fourth inner port 114 and the outer valve body. Of course, the second inner port 112 and the fourth inner port 114 can also be used as inlets, and the first inner port 111 and the third inner port 113 can also be used as outlets. Alternatively, the valve body can have only the first inner port 111 and the second inner port 112, with fluid flowing into the inner valve body through the first inner port 111 and out through the second inner port 112.
[0024] See Figure 3 The first inner interface is a circular hole, and the diameter of the first inner interface cross-section circle is denoted as d1, 3mm≤d1≤5.5mm. The second inner interface is a circular hole, and the diameter of the second inner interface cross-section circle is denoted as d2, 5.5mm≤d2≤10.8mm. Preferably, the diameter of the first inner interface cross-section circle is d1, d1=4mm, d2=7.5mm. Here, the size design of the inner interface ensures that the fluid has sufficient flow area and is easy to process.
[0025] See Figure 4In this embodiment, the expansion valve has the first inner interface 111 and the fourth inner interface 114 located on the same side of the valve body 11, and the second inner interface 112 and the third inner interface 113 located on the other side of the valve body 11. Along the axial direction of the transmission rod component, the first inner interface 111 is lower than the second inner interface 112, and the third inner interface 113 and the fourth inner interface 114 are approximately at the same height. The valve body 11 includes a first sealing groove 118, a second sealing groove 119, and a third sealing groove 120. The expansion valve includes a first sealing ring 131, a second sealing ring 132, and a third sealing ring 133. The first sealing ring 131 is located on the peripheral side above the third inner interface 113 and the fourth inner interface 114 of the valve. The second sealing ring 132 is located on the peripheral side below the third inner interface 113 and the fourth inner interface 114 of the valve body. The third sealing groove 120 is located on the peripheral side above the first inner interface 111 of the valve body and on the peripheral side below the second inner interface 112 of the valve body. The first sealing ring 131 is at least partially located in the first sealing groove 118, the second sealing ring 132 is at least partially located in the second sealing groove 119, and the third sealing ring 133 is at least partially located in the third sealing groove 120.
[0026] See Figure 2 , Figure 3 and Figure 4The valve body 11 includes a valve body part 141, a valve body part 142, and a valve body part 143. The valve body part 141, valve body part 142, and valve body part 143 are generally cylindrical in shape. In cross-section, the radial diameter of the valve body part 141 is larger than that of the valve body part 142, and the radial diameter of the valve body part 142 is larger than that of the valve body part 143. In terms of height, the valve body part 143 is lower than the valve body part 142, and the valve body part 142 is lower than the valve body part 141. The maximum value of the valve body part 143 is smaller than that of the valve body part 142. The maximum point is smaller than the maximum point of valve body part 141. Valve body part 2 142 is located between valve body part 141 and valve body part 3 143. The first sealing ring 131 is located above valve body part 141. The second sealing ring 132 is located below valve body part 141 and above valve body part 2 142. The third sealing ring 133 is located below valve body part 2 141 and above valve body part 3 143. Or, the second sealing ring 132 is located between valve body part 141 and valve body part 2 142, and the third sealing ring 133 is located between valve body part 2 142 and valve body part 3 143. The third inner interface 113, the fourth inner interface 114, and the second flow channel 117 are located in the first part of the valve body 141, the second inner interface 112 is located in the second part of the valve body 142, the first inner interface 111 is located in the third part of the valve body 143, the first flow channel 115 is partially located in the second part of the valve body 142 and partially located in the third part of the valve body 143, and the throttling part 116 is approximately located inside one or two of the three parts of the valve body 142, the third sealing groove 120, and the third part of the valve body 143, or at corresponding positions. The first inner interface 111 and the second inner interface 112 are connected to the valve core assembly through the throttling part 116. The third sealing ring 133 prevents the first inner interface 111 and the second inner interface 112 from communicating with the outer valve body through the space between the outer wall of the valve body and the outer valve body. The second sealing ring 132 prevents the second inner interface 112 from communicating with the third inner interface 113 and the fourth inner interface 114 through the space between the outer wall of the valve body and the outer valve body. The size, shape, and interface of the inner valve body of this expansion valve can be standardized. Different outer valve bodies with different structures can be selected to match the expansion valve according to the needs of different systems, thereby improving production efficiency.
[0027] See Figure 1 , Figure 4 , Figure 6In this embodiment, the outer valve body 100 includes a first interface portion 121, a second interface portion 122, a third interface portion 123, and a fourth interface portion 124. The first interface portion 121 has a first interface 1211 and a first outer interface 1212, the second interface portion 122 has a second interface 1221 and a second outer interface 1222, the third interface portion 123 has a third interface 1231 and a third outer interface 1232, and the fourth interface portion 124 has a fourth interface 1241 and a fourth outer interface 1242. The first interface 1211 is positioned and connected to the first inner interface 111 of the inner valve body, the second interface 1221 is positioned and connected to the second inner interface 112 of the inner valve body, the third interface 1231 is positioned and connected to the third inner interface 113 of the inner valve body, and the fourth interface 1241 is positioned and connected to the fourth inner interface 114 of the inner valve body. Of course, this may only include the first interface portion 121 and the second interface portion 122, while the cavity within the power head component can be connected to the part requiring temperature sensing via a connecting pipe. This invention, through the combination of an outer valve body and different valve bodies, meets the installation requirements of different expansion valve interfaces.
[0028] See Figures 1-6 When the inner valve body 100 and the outer valve body 200 are assembled, the first inner interface 111 is connected to the first interface 1211, the second inner interface 112 is connected to the second interface 1221, the first interface 1211 is connected to the second interface 1221 through the first flow channel 115, the third inner interface 123 is connected to the third interface 1231, the fourth inner interface 114 is connected to the fourth interface 1241, and the third interface 1231 is connected to the fourth interface 1241 through the second flow channel 117.
[0029] The first interface 1211 is greater than or equal to the first inner interface 111 of the valve body 11; the second interface 1221 is greater than or equal to the second inner interface 112 of the valve body 11; the third interface 1231 is greater than or equal to the third inner interface 113 of the valve body 11; the fourth interface 1241 is greater than or equal to the fourth inner interface 114 of the inner valve body; the first outer interface 1212 of the first interface portion 121, which is relatively closer to the outer side, is greater than the first interface 1211 of the first interface portion 121, which is closer to the inner side of the inner valve body; the second outer interface 1222 of the second interface portion 122, which is relatively closer to the outer side, is greater than the second interface 1211 of the second interface portion 122, which is closer to the inner side of the inner valve body. 221. The third outer interface 1232 of the third interface portion 123, which is relatively closer to the outer side, is larger than the third interface 1231 of the third interface portion 123, which is closer to the inner side of the inner valve body. Similarly, the fourth outer interface 1242 of the fourth interface portion 124, which is relatively closer to the outer side, is larger than the fourth interface 1241 of the fourth interface portion 124, which is closer to the inner side of the inner valve body. This has two advantages: firstly, it ensures that, within the allowable error range, each interface has sufficient flow area during the processing and assembly of the expansion valve, reducing flow resistance; secondly, it does not affect the position of the sealing groove and the installation of the internal disc spring, and it can reduce the overall size of the expansion valve. In this text, "size" refers to the size of the flow area. For example, the outer part of the first outer interface 1212 is greater than or equal to the inner part of the first interface 1211, which is closer to the inner valve body. In cases where the shape is not perfectly regular, it means that the flow area of the outer part of the first outer interface facing outward is greater than or equal to the flow area of the inner part closer to the inner valve body.
[0030] See Figure 1 and Figure 5 The inner valve body 200 also includes a positioning part 24. In this embodiment, the positioning part 24 is located at the top relative to the valve body 11, above the first sealing groove 118. The positioning part 24 includes a positioning notch 25, and a first positioning surface 251 is formed at the positioning notch 25. The first positioning surface 251 can be a plane. See also Figure 1 and Figure 7The outer valve body 100 includes a mating positioning part 26, which can be a protruding structure. The mating positioning part 26 is located on the inner wall surface of the outer valve body 100 and includes a second positioning surface 261. In this embodiment, the second positioning surface 261 of the mating positioning part 26 is a planar structure. The mating positioning part 26 and the positioning notch 25 are mated together, and the first positioning surface 251 and the second positioning surface 261 are mated to prevent the inner valve body from rotating circumferentially relative to the outer valve body. In other words, when rotating, the first positioning surface 251 will abut against the second positioning surface 261, thereby achieving the positioning purpose. When the inner valve body 200 is assembled with the outer valve body 100, the positioning notch 25 and the mating positioning part 26 are matched. In this invention, a positioning notch 25 is provided in the circumferential direction of the positioning part 24, and a mating positioning part is provided in the corresponding part of the outer valve body. The two are mated to prevent the inner valve body 200 from rotating in the circumferential direction when the air conditioning system is working. Alternatively, the positioning and mating structure can be configured in reverse, with a notch on the inner wall of the outer valve body and a corresponding protrusion on the inner valve body, achieving the same positioning purpose. In this embodiment, the adjusting component is fixed to the valve body, such as by threads. Alternatively, the adjusting component can also be fixed to the outer valve body by threads. That is, the valve body of the inner valve body is assembled with the outer valve body, and then the adjusting component is installed, or the valve core and adjusting component are installed, and the expansion valve is adjusted by the adjusting component. This avoids assembly errors and makes the control of the expansion valve more precise. The adjusting component can be threaded with the outer valve body or the inner valve body. In this embodiment, the positioning notch serves as the notch portion of the positioning structure, and the mating positioning portion serves as the protrusion portion of the positioning structure. In this text, the protrusion portion is a relatively regular shape with relatively more protrusions, while the notch portion or recess portion is a relatively regular shape with relatively fewer protrusions.
[0031] See Figure 8 The inner valve body 300 of the second embodiment of the present invention, which is identical to the inner valve body 200 of the first embodiment, will not be described again here. The inner valve body 300 includes a valve body 11, and the valve body 11 includes a positioning part 34. The positioning part 34 is at least partially located on the upper side of the first sealing groove 118. In this embodiment, the valve body has two positioning holes 372 in the positioning part 34, and the positioning part 34 also includes two pins 373. Each pin 373 is at least partially located in the positioning hole 372. The outer valve body has a recess at a position corresponding to the pin, and at least part of the pin is located in the recess of the outer valve body. The valve body 11 and the outer valve body are positioned by the pins 373. Alternatively, only one pin can be provided to achieve the same relative positioning purpose. In this embodiment, the pin serves as a protrusion of the positioning structure.
[0032] See Figure 1 , Figure 9 , Figure 10 as well as Figure 11The third embodiment of the present invention includes an outer valve body 400, which includes a limiting part 41 and a retaining groove 411; a power head assembly 12 includes an air box head 102; and an expansion valve further includes a retaining ring 42, which includes a main body 421 and a retaining part 422. The retaining ring is made of an elastic material, and there is a certain distance between the two retaining parts 422. After compression, the retaining ring 42 can be inserted into the retaining groove 411. After the retaining ring 42 is inserted into the retaining groove 411, the retaining ring 42... The retaining ring 42 is at least partially located in the groove 411, and at least partially located above the inner valve body, thereby restricting the inner valve body from axially disengaging from the outer valve body and achieving the limiting of the inner and outer valve bodies. Specifically, at least part of the main body 421 of the retaining ring 42 is located in the groove 411, and at least part of the retaining ring 42 is located above the gas box head 102. When the gas box head 102 is to be moved upward, it abuts against and limits the gas box head 102. The retaining part may also be provided with a through hole 423, which facilitates installation. The sealing method between the inner valve body and the outer valve body 400 can refer to the embodiment described above. In addition, a limiting structure is provided between the inner valve body and the outer valve body 400 to prevent relative rotation of the inner valve body, which can also refer to the above description, to prevent the inner valve body of the expansion valve from rotating in the circumferential direction when the air conditioning system is working.
[0033] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the invention. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify or make equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.
Claims
1. An expansion valve, comprising an inner valve body and an outer valve body, wherein the inner valve body and the outer valve body are fixed or limited in position, the inner valve body comprising a valve body, a power head assembly, and a transmission rod assembly, the expansion valve comprising a valve core assembly and an adjusting assembly, the transmission rod assembly drivingly connecting the power head assembly and the valve core assembly, the action of the power head assembly acting on the valve core assembly through the transmission rod assembly; the valve body is located within the outer valve body; the outer valve body comprises a first interface portion and a second interface portion, the first interface portion having a first interface, and the second interface portion having a second interface; the inner valve body having a first inner interface corresponding to and communicating with the first interface, and a second inner interface corresponding to and communicating with the second interface; the expansion valve having at least two sealing rings between the inner valve body and the outer valve body, the inner valve body or the outer valve body having corresponding sealing grooves, and at least a portion of each of the two sealing rings being located in the corresponding sealing groove; in the axial height direction of the expansion valve, at least one sealing ring is positioned higher than the first inner interface and lower than the second inner interface; The outer valve body includes a third interface portion and a fourth interface portion, the third interface portion having a third interface and the fourth interface portion having a fourth interface; the inner valve body has a third inner interface corresponding to and communicating with the third interface and a fourth inner interface corresponding to and communicating with the fourth interface. The first inner interface is a circular hole, and the diameter of the first inner interface cross-section circle is denoted as d1, where 3mm≤d1≤5.5mm.
2. The expansion valve as described in claim 1, characterized in that, The second inner interface is a circular hole, and the diameter of the cross-section of the second inner interface is denoted as d2, where 5.5mm≤d2≤10.8mm.
3. The expansion valve as described in claim 1 or 2, characterized in that, The expansion valve is provided with at least three sealing rings between the inner valve body and the outer valve body: at least one sealing ring is higher than the second inner interface and lower than the third inner interface or the fourth inner interface, and at least one sealing ring is higher than the third inner interface or the fourth inner interface; or at least one sealing ring is higher than the second inner interface and lower than the third inner interface and the fourth inner interface, and at least one sealing ring is higher than the third inner interface and the fourth inner interface.
4. The expansion valve as described in claim 3, characterized in that, The valve body includes a valve body part one, a valve body part two, and a valve body part three. In terms of height, the valve body part three is lower than the valve body part two, the valve body part two is lower than the valve body part one, the maximum point of the valve body part three is smaller than the maximum point of the valve body part two, and the maximum point of the valve body part two is smaller than the maximum point of the valve body part one; the first internal interface is disposed in the valve body part three, and the second internal interface is disposed in the valve body part two.
5. The expansion valve as described in claim 4, characterized in that, The third inner interface and the fourth inner interface are disposed on a portion of the valve body, and the third inner interface and the fourth inner interface are connected; the inner valve body is provided with a first sealing groove, a second sealing groove, and a third sealing groove, and the expansion valve includes a first sealing ring, a second sealing ring, and a third sealing ring, wherein the first sealing ring is at least partially located in the first sealing groove, the second sealing ring is at least partially located in the second sealing groove, and the third sealing ring is at least partially located in the third sealing groove; in the height direction, the first sealing groove is located above the third inner interface and the fourth inner interface, the second sealing groove is located below the third inner interface and the fourth inner interface, the second sealing groove is located above the second inner interface, the third sealing groove is located below the second inner interface, and the third sealing groove is located above the first inner interface.
6. The expansion valve as described in any one of claims 1, 2, 4, and 5, characterized in that, The expansion valve is provided with a positioning structure, which includes a protrusion provided on the outer valve body and a recess or notch provided on the inner valve body; or, the positioning structure includes a recess or notch provided on the outer valve body and a protrusion provided on the inner valve body. Alternatively, the inner valve body includes a positioning part, the positioning part includes a positioning notch, the positioning notch includes a first contact surface, the first contact surface is a plane, the outer valve body includes a mating positioning part, the mating positioning part is located on the inner wall surface of the outer valve body, the mating positioning part includes a second contact surface, the second contact surface is a plane, and when the mating positioning part and the positioning notch are mated, the first contact surface abuts against the second contact surface.
7. The expansion valve as described in claim 6, characterized in that: The positioning part is located at the top of the valve body. The positioning part includes a positioning pin. The outer valve body includes a pin hole. The pin passes through the pin hole. The inner valve body and the outer valve body are positioned and connected by the pin.
8. The expansion valve as described in claim 3, characterized in that, The expansion valve is provided with a positioning structure, which includes a protrusion provided on the outer valve body and a recess or notch provided on the inner valve body; or, the positioning structure includes a recess or notch provided on the outer valve body and a protrusion provided on the inner valve body. Alternatively, the inner valve body includes a positioning part, the positioning part includes a positioning notch, the positioning notch includes a first contact surface, the first contact surface is a plane, the outer valve body includes a mating positioning part, the mating positioning part is located on the inner wall surface of the outer valve body, the mating positioning part includes a second contact surface, the second contact surface is a plane, and when the mating positioning part and the positioning notch are mated, the first contact surface abuts against the second contact surface.
9. The expansion valve as described in claim 8, characterized in that: The positioning part is located at the top of the valve body. The positioning part includes a positioning pin. The outer valve body includes a pin hole. The pin passes through the pin hole. The inner valve body and the outer valve body are positioned and connected by the pin.
10. The expansion valve as claimed in claim 6, characterized in that, The outer valve body also includes a limiting part, which includes a groove. The power head assembly includes an air box head. The expansion valve includes a retaining ring, which is made of an elastic material. The retaining ring includes a main body and a snap-fit part. The retaining ring can be inserted into the groove after compression. When the retaining ring is inserted into the groove, it springs open. At least a portion of the main body of the retaining ring is located in the groove, and at least a portion of the retaining ring is located above the air box head, abutting and limiting the air box head. The snap-fit part has a through hole. The main material of the retaining ring is aluminum.
11. The expansion valve according to any one of claims 7-9, characterized in that, The outer valve body also includes a limiting part, which includes a groove. The power head assembly includes an air box head. The expansion valve includes a retaining ring, which is made of an elastic material. The retaining ring includes a main body and a snap-fit part. The retaining ring can be inserted into the groove after compression. When the retaining ring is inserted into the groove, it springs open. At least a portion of the main body of the retaining ring is located in the groove, and at least a portion of the retaining ring is located above the air box head, abutting and limiting the air box head. The snap-fit part has a through hole. The main material of the retaining ring is aluminum.
12. The expansion valve according to any one of claims 1, 2, 4, 5, 7-10, characterized in that, The first interface portion has a first external interface, and the second interface portion has a second external interface. The first interface is greater than or equal to the first internal interface, and the second interface is greater than or equal to the second internal interface. The first external interface of the first interface portion relative to the outward outer side is greater than or equal to the first interface of the first interface portion near the inner side of the inner valve body, and the second external interface of the second interface portion relative to the outward outer side is greater than or equal to the second interface of the second interface portion near the inner side of the inner valve body.
13. The expansion valve as claimed in claim 9, characterized in that, The third interface portion has a third external interface, the fourth interface portion has a fourth external interface, the third interface is greater than or equal to the third internal interface, the fourth interface is greater than or equal to the fourth internal interface, the third external interface of the third interface portion relative to the outward-facing outer side is greater than or equal to the third interface of the third interface portion near the inner side of the inner valve body, and the fourth external interface of the fourth interface portion relative to the outward-facing outer side is greater than or equal to the fourth interface of the fourth interface portion near the inner side of the inner valve body.
14. The expansion valve as claimed in claim 3, characterized in that, The first interface portion has a first external interface, and the second interface portion has a second external interface. The first interface is greater than or equal to the first internal interface, and the second interface is greater than or equal to the second internal interface. The first external interface of the first interface portion relative to the outward outer side is greater than or equal to the first interface of the first interface portion near the inner side of the inner valve body, and the second external interface of the second interface portion relative to the outward outer side is greater than or equal to the second interface of the second interface portion near the inner side of the inner valve body.
15. The expansion valve as claimed in claim 14, characterized in that, The third interface portion has a third external interface, the fourth interface portion has a fourth external interface, the third interface is greater than or equal to the third internal interface, the fourth interface is greater than or equal to the fourth internal interface, the third external interface of the third interface portion relative to the outward-facing outer side is greater than or equal to the third interface of the third interface portion near the inner side of the inner valve body, and the fourth external interface of the fourth interface portion relative to the outward-facing outer side is greater than or equal to the fourth interface of the fourth interface portion near the inner side of the inner valve body.
16. The expansion valve as claimed in claim 6, characterized in that, The first interface portion has a first external interface, and the second interface portion has a second external interface. The first interface is greater than or equal to the first internal interface, and the second interface is greater than or equal to the second internal interface. The first external interface of the first interface portion relative to the outward outer side is greater than or equal to the first interface of the first interface portion near the inner side of the inner valve body, and the second external interface of the second interface portion relative to the outward outer side is greater than or equal to the second interface of the second interface portion near the inner side of the inner valve body.
17. The expansion valve as claimed in claim 16, characterized in that, The third interface portion has a third external interface, the fourth interface portion has a fourth external interface, the third interface is greater than or equal to the third internal interface, the fourth interface is greater than or equal to the fourth internal interface, the third external interface of the third interface portion relative to the outward-facing outer side is greater than or equal to the third interface of the third interface portion near the inner side of the inner valve body, and the fourth external interface of the fourth interface portion relative to the outward-facing outer side is greater than or equal to the fourth interface of the fourth interface portion near the inner side of the inner valve body.
18. The expansion valve as claimed in claim 11, characterized in that, The first interface portion has a first external interface, and the second interface portion has a second external interface. The first interface is greater than or equal to the first internal interface, and the second interface is greater than or equal to the second internal interface. The first external interface of the first interface portion relative to the outward outer side is greater than or equal to the first interface of the first interface portion near the inner side of the inner valve body, and the second external interface of the second interface portion relative to the outward outer side is greater than or equal to the second interface of the second interface portion near the inner side of the inner valve body.
19. The expansion valve as claimed in claim 18, characterized in that, The third interface portion has a third external interface, the fourth interface portion has a fourth external interface, the third interface is greater than or equal to the third internal interface, the fourth interface is greater than or equal to the fourth internal interface, the third external interface of the third interface portion relative to the outward-facing outer side is greater than or equal to the third interface of the third interface portion near the inner side of the inner valve body, and the fourth external interface of the fourth interface portion relative to the outward-facing outer side is greater than or equal to the fourth interface of the fourth interface portion near the inner side of the inner valve body.