Valve body assembly

Abstract

The utility model provides a valve body assembly, the valve body assembly comprises a nut piece, a connecting sleeve and a valve core, the connecting sleeve and the valve core are arranged in a split mode, the nut piece comprises a matching section, and the matching section is limited between the connecting sleeve and the valve core to limit the movement of the nut piece. According to the technical scheme provided by the utility model, the nut piece is limited and clamped between the valve core and the connecting sleeve, and the nut piece cannot move axially; meanwhile, the limiting part of the nut piece is in limiting fit with the matching part of the connecting sleeve or the matching part of the valve element, and the nut piece cannot rotate. The nut part is fixed through the valve element and the connecting sleeve, the procedure that in the prior art, injection molding is conducted on the nut part firstly, and then welding is conducted is omitted, the installation efficiency of the nut part is improved, and the production cost of the valve body assembly is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, and particularly relates to a valve body assembly. Background Art

[0002] For the installation of the nut part of the valve body assembly of the existing electronic expansion valve, the method of injection molding first and then assembly is usually adopted, that is, the nut part and the connecting plate are injection molded together first, and then the whole is assembled with other structures of the valve body assembly to complete the limit installation of the nut part. However, due to the low injection molding efficiency and the need for welding during assembly, the production efficiency of the valve body assembly and the electronic expansion valve is low and the production cost is high. Summary of the Utility Model

[0003] The utility model provides a valve body assembly to solve the problem that the nut part in the prior art often adopts the connection and assembly method of injection molding with the connecting plate and then welding, resulting in low production efficiency and high production cost of the valve body assembly and the electronic expansion valve.

[0004] To solve the above problems, the utility model provides a valve body assembly, which includes a nut part, and a connecting sleeve and a valve core that are separately arranged. The nut part includes a fitting section, and the fitting section is limited between the connecting sleeve and the valve core to limit the movement of the nut part.

[0005] Further, the connecting sleeve has a stepped hole and a first step surface in the stepped hole; the fitting section of the nut part is arranged in the stepped hole, one end of the fitting section has a second step surface, and the second step surface abuts against the first step surface; the valve core abuts against the other end of the fitting section.

[0006] Further, there is also a third step surface in the stepped hole that is spaced from the first step surface. The valve core is fixedly connected to the connecting sleeve, and one end of the valve core arranged in the stepped hole is in stop fit with the third step surface; the other end of the fitting section abuts against one end of the valve core arranged in the stepped hole.

[0007] Further, the distance between the first step surface and the third step surface is L, and the distance between the second step surface and the other end of the fitting section is H, and H≥L.

[0008] Further, the fitting section is located in the connecting sleeve and has a clearance fit with the inner wall of the cavity of the connecting sleeve; the valve core is welded to the connecting sleeve, or the valve core has an interference fit with the inner wall of the cavity of the connecting sleeve.

[0009] Further, the valve core includes a main body extending into the connecting sleeve and a limit protrusion arranged on the main body. The limit protrusion extends into the cavity of the fitting section and has an interference or transitional fit with the inner wall of the cavity of the fitting section. The main body is connected to the connecting sleeve and abuts against one end of the fitting section.

[0010] Further, the nut part is injection molded from resin, and the connecting sleeve and the valve core are formed by metal processing.

[0011] Further, the stepped hole includes a first hole section, a second hole section, and a third hole section that are sequentially connected and have sequentially increasing hole diameters. A first stepped surface is formed between the first hole section and the second hole section, and a third stepped surface is formed between the second hole section and the third hole section; the fitting section includes a first sub-section and a second sub-section that are connected to each other. The outer diameter of the first sub-section is smaller than that of the second sub-section, and a second stepped surface is formed between the two.

[0012] Further, the nut member further includes a limiting portion, and the connecting sleeve or the valve core is provided with a mating portion. The limiting portion is in limit fit with the mating portion to limit the rotation of the nut member around the axis of the valve body assembly.

[0013] Further, the limiting portion of the nut member is a positioning rib, and the mating portion of the connecting sleeve or the valve core is a positioning groove. At least a part of the positioning rib is located in the positioning groove.

[0014] Further, the positioning rib protrudes from the outer wall of the fitting section and extends along the axial direction of the valve body assembly, and the positioning groove is provided on the inner wall of the cavity of the connecting sleeve and extends along the axial direction of the valve body assembly.

[0015] Further, the valve body assembly further includes a sleeve. The sleeve is connected to the valve core to form an installation cavity. The nut member is arranged in the installation cavity and divides the installation cavity into an upper sub-cavity and a lower sub-cavity. The nut member has a balance hole, and both ends of the balance hole communicate with the positioning groove and the lower sub-cavity respectively.

[0016] Applying the technical solution of the present utility model, a valve body assembly is provided. The valve body assembly includes a nut member, and a connecting sleeve and a valve core that are separately arranged. The nut member includes a fitting section, and the fitting section is limited between the connecting sleeve and the valve core to limit the movement of the nut member.

[0017] Adopting this solution, the nut member is limited and clamped between the valve core and the connecting sleeve, and the fixing of the nut member is realized through the valve core and the connecting sleeve, eliminating the processes of first injection molding and then welding the nut member in the prior art, which is beneficial to improving the installation efficiency of the nut member and reducing the production cost of the valve body assembly. Description of the Drawings

[0018] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0019] Figure 1 The application schematic diagram of the valve body assembly provided by the embodiment of the present utility model in an electronic expansion valve is shown;

[0020] Figure 2 It shows Figure 1 the structural schematic diagram of the nut member in the valve body assembly;

[0021] Figure 3 shows a cross-sectional view of the nut member; Figure 2 ;

[0022] Figure 4 shows Figure 1 a schematic structural view of the connecting sleeve in the valve body assembly of;

[0023] Figure 5 shows Figure 4 a cross-sectional view of the connecting sleeve.

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 10. Valve body assembly; 101. Upper sub-cavity; 102. Lower sub-cavity;

[0026] 11. Connecting sleeve; 111. Step hole; 1111. First step surface; 1112. Third step surface; 1113. First hole section; 1114. Second hole section; 1115. Third hole section; 1116. Positioning groove;

[0027] 12. Nut member; 121. Fitting section; 1211. Second step surface; 1212. First sub-section; 1213. Second sub-section; 1214. Balance hole; 122. Guide section; 123. Positioning rib;

[0028] 13. Valve core; 131. Main body; 132. Limit protrusion;

[0029] 14. Sleeve;

[0030] 20. Valve needle assembly;

[0031] 30. Driving assembly;

[0032] 40. Stopper. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1 to 5As shown in the figure, an embodiment of the present utility model provides a valve body assembly 10, which includes a nut member 12 and a split connection sleeve 11 and a valve core 13; the nut member 12 includes a mating section 121, and the mating section 121 is limited between the connection sleeve 11 and the valve core 13 to restrict the movement of the nut member 12.

[0035] In this embodiment, the nut member 12 is clamped and installed between the valve core 13 and the connection sleeve 11, and the nut member 12 cannot move axially; at the same time, the limiting portion of the nut member 12 is in limit fit with the mating portion of the connection sleeve 11 or the mating portion of the valve core 13, and the nut member 12 cannot rotate either. The nut member 12 is fixed by the valve core 13 and the connection sleeve 11, eliminating the prior art process of first injection molding and then welding the nut member 12, which is beneficial to improving the installation efficiency of the nut member 12 and reducing the production cost of the valve body assembly 10.

[0036] Specifically, the connection sleeve 11 has a stepped hole 111 and a first stepped surface 1111 is provided in the stepped hole 111; the mating section 121 of the nut member 12 is arranged in the stepped hole 111, one end of the mating section 121 has a second stepped surface 1211, and the second stepped surface 1211 abuts against the first stepped surface 1111; the valve core 13 abuts against the other end of the mating section 121.

[0037] In this embodiment, the movement of the nut member 12 in one direction along the axis of the valve body assembly 10 is restricted by the abutment of the first stepped surface 1111 and the second stepped surface 1211, and the movement of the nut member 12 in the other direction along the axis of the valve body assembly 10 is restricted by the abutment of the valve core 13 against the mating section 121. Combining the limit fit between the mating section 121 and the inner wall of the stepped hole 111, the limit installation of the nut member 12 is completed, ensuring the fixing effect of the valve core 13 and the connection sleeve 11 on the nut member 12.

[0038] As Figures 1 to 5 shown, a third stepped surface 1112 spaced from the first stepped surface 1111 is also provided in the stepped hole 111. The valve core 13 and the connection sleeve 11 are fixedly connected. One end of the valve core 13 arranged in the stepped hole 111 is in stop fit with the third stepped surface 1112, and the other end of the mating section 121 abuts against one end of the valve core 13 arranged in the stepped hole 111.

[0039] With this setting, the valve core 13 is stopped by the third stepped surface, facilitating the positioning and installation of the valve core 13, and at the same time avoiding the situation that the valve core 13 extends too much, resulting in too large a pressing force on the nut member 12 and the nut member 12 being easily damaged.

[0040] As Figure 3 and Figure 5As shown, the distance between the first stepped surface 1111 and the third stepped surface 1112 is L, and the distance between the second stepped surface 1211 and the other end of the mating section 121 is H, where H ≥ L.

[0041] With such a setting, it ensures the simultaneous limitation of both ends of the mating section 121 by the valve core 13 and the first stepped surface 1111, avoiding the situation where one end abuts and the other end has a gap, which may cause the nut member 12 to move around in the stepped hole 111, and ensuring the reliability and stability of the installation of the nut member 12.

[0042] Among them, the nut member 12 is formed by resin injection molding, and the connecting sleeve 11 and the valve core 13 are formed by metal processing.

[0043] With such a setting, the nut member 12 can have a certain amount of deformation, avoiding the situation where the structure of the nut member 12 (mainly the mating section 121) is easily damaged due to excessive force, and at the same time avoiding the influence of assembly errors formed due to assembly accuracy or processing accuracy problems of the nut member 12, the connecting sleeve 11 and the valve core 13 on the pressing installation of the mating section 121 of the nut member 12 by the connecting sleeve 11 and the valve core 13, and ensuring the reliability of the installation of the nut member 12.

[0044] Preferably, 0 < H - L < 0.5 mm.

[0045] With such a setting, the difference between H and L is limited, avoiding the situation where the mating section 121 moves around inside when the difference is too small, and at the same time avoiding the difficulty in positioning and installing the valve core 13 when the difference is too large. By controlling the deformation amount of the nut member 12, when the valve core 13 abuts and presses the mating section 121, it can also abut against the third stepped surface 1112, ensuring the reliability of the installation of the nut member 12 and the valve core 13.

[0046] In this embodiment, the mating section 121 is located inside the connecting sleeve 11 and has a clearance fit with the inner wall of the connecting sleeve 11, and the valve core 13 has an interference fit with the inner wall of the cavity of the connecting sleeve 11, that is, the mating section 121 has a clearance fit with the inner wall of the stepped hole 111, and the valve core 13 has an interference fit with the inner wall of the stepped hole 111. With such a setting, it is convenient for the valve core 13 to press-fit the mating section 121 while realizing the connection between the valve core 13 and the connecting sleeve 11, which is beneficial to improving the installation efficiency of the nut member 12, and further beneficial to improving the production efficiency of the valve body assembly 10 and the electronic expansion valve.

[0047] It can be understood that in another embodiment, the mating section 121 has a clearance fit with the inner wall of the stepped hole 111, and the valve core 13 is welded to the connecting sleeve 11. In this embodiment, the pressing of the nut member 12 is also achieved through the valve core 13, but the valve core 13 also has a clearance fit with the inner wall of the stepped hole 111. After the valve core 13 abuts against the third stepped surface 1112 to complete the pressing of the nut member 12, the valve core 13 and the connecting sleeve 11 are then welded.

[0048] like Figure 1 As shown, the valve core 13 includes a main body 131 extending into the connecting sleeve 11 (i.e., the stepped hole 111) and a limiting protrusion 132 arranged on the main body 131. The limiting protrusion 132 extends into the cavity of the matching section 121 and has an interference fit or transition fit with the inner wall of the cavity of the matching section 121. The main body 131 is connected to the connecting sleeve 11 and abuts against one end of the matching section 121. Such an arrangement is conducive to ensuring the coaxiality of the valve core 13 and the nut member 12 through the interference fit or transition fit between the limiting protrusion 132 and the matching section 121.

[0049] The nut member 12 further includes a guide section 122 connected to the mating section 121. The mating section 121 is arranged in the stepped hole 111 and the guide section 122 passes through and protrudes out of the stepped hole 111. The main body 131 is connected to the connecting sleeve 11 and abuts against one end of the mating section 121 away from the guide section 122.

[0050] like Figures 1 to 5 As shown, the stepped hole 111 includes a first hole section 1113, a second hole section 1114 and a third hole section 1115 which are connected in sequence and have increasing apertures in sequence, a first step surface 1111 is formed between the first hole section 1113 and the second hole section 1114, and a third step surface 1112 is formed between the second hole section 1114 and the third hole section 1115; the matching section 121 includes a first subsection 1212 and a second subsection 1213 which are connected to each other, the outer diameter of the first subsection 1212 is smaller than that of the second subsection 1213, and a second step surface 1211 is formed between the two. This arrangement facilitates the forming of the first step surface 1111, the second step surface 1211 and the third step surface 1112. Among them, the first subsection 1212 and the inner wall of the first hole section 1113 are limitedly matched, the second subsection 1213 and the inner wall of the second hole section 1114 are limitedly matched; the valve core 13 and the inner wall of the third hole section 1115 are limitedly matched.

[0051] Specifically, the nut member 12 also includes a limiting portion, and the connecting sleeve 11 or the valve core 13 is provided with a matching portion, and the limiting portion and the matching portion are limitedly matched to limit the rotation of the nut member 12 around the axis of the valve body assembly. This arrangement further ensures the fixing effect of the valve core 13 and the connecting sleeve 11 on the nut member 12.

[0052] like Figures 1 to 5 As shown, the limiting portion of the nut member 12 is a positioning rib 123 , the matching portion of the connecting sleeve 11 or the matching portion of the valve core 13 is a positioning groove 1116 , and the positioning rib 123 is at least partially located in the positioning groove 1116 .

[0053] This arrangement facilitates the processing and matching of the limiting portion and the matching portion, and the guiding installation of the nut member 12 and the restriction of the rotation of the nut member 12 around the axis of the valve body assembly are achieved through the limiting matching of the positioning rib 123 and the positioning groove 1116.

[0054] Specifically, the positioning rib 123 protrudes from the outer wall of the fitting section 121 and extends along the axial direction of the valve body assembly. The positioning groove 1116 is provided on the inner wall of the chamber of the connecting sleeve 11 (i.e., the inner wall of the stepped hole 111) and extends along the axial direction of the valve body assembly. This setting further improves the convenience of machining the limiting part and the fitting part. In this embodiment, the positioning rib 123 is provided on the outer periphery of the first sub-section 1212 on the second step surface 1211, and the positioning groove 1116 is provided in the first hole section 1113. The shapes of the positioning rib 123 and the positioning groove 1116 are adapted, and the cross-sectional shape is semi-circular. It can be understood that the cross-sectional shapes adapted to the positioning rib 123 and the positioning groove 1116 can also be other adapted shapes such as rectangles, and no further examples are given here.

[0055] As Figure 1 and Figure 2 shown, the valve body assembly further includes a sleeve 14. The sleeve 14 is connected to the valve core 13 to form an installation cavity. The nut member 12 is disposed in the installation cavity and divides the installation cavity into an upper sub-cavity 101 and a lower sub-cavity 102. The nut member 12 has a balance hole 1214, and both ends of the balance hole 1214 are respectively communicated with the positioning groove 1116 and the lower sub-cavity 102. Specifically, the balance hole 1214 is located on the fitting section 121, and one end of the positioning groove 1116 is communicated with the upper sub-cavity 101.

[0056] With this setting, the upper sub-cavity 101 and the lower sub-cavity 102 are communicated through the balance hole 1214 to ensure the pressure balance in the upper sub-cavity 101 and the lower sub-cavity 102 when the electronic expansion valve using the valve body assembly 10 opens and closes the valve, and to ensure the reliability and stability of the opening and closing movement of the electronic expansion valve.

[0057] Among them, in this embodiment, the balance hole 1214 is provided on the outer periphery of the first sub-section 1212 and above the positioning rib 123 to facilitate the communication between the balance hole 1214 and the positioning groove 1116.

[0058] Other embodiments of the present utility model that do not show the drawings provide an electronic expansion valve. The electronic expansion valve includes a valve needle assembly 20, a driving assembly 30, a stopper 40, and the above-mentioned valve body assembly 10. The assembly process of the valve body assembly 10 and the electronic expansion valve using the valve body assembly 10 includes:

[0059] 1. Install the valve needle assembly 20 on the nut member 12;

[0060] 2. Put on and connect the connecting sleeve 11 until the first step surface 1111 of the connecting sleeve 11 abuts against the second step surface 1211 of the nut member 12 to complete the limit installation of the connecting sleeve 11 and the nut member 12;

[0061] 3. Install the valve core 13 to press-fit the nut part 12. The limiting protrusion 132 of the valve core 13 is in interference or transitional fit with the inner wall of the mating section 121 of the nut part 12 during installation until the main body 131 of the valve core 13 abuts against the third step surface 1112 of the connecting sleeve 11, completing the installation of the valve body assembly 10. The valve core 13 is connected to the connecting sleeve 11, and the connection method is welding or interference fit;

[0062] 4. Install the stopper 40 on the valve needle assembly 20;

[0063] 5. Install other structures such as the sleeve 14 and the drive assembly 30 to complete the installation of the electronic expansion valve.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0066] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the protection scope of the present invention; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0067] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0068] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0069] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A valve body assembly, characterized in that, Comprising: A connecting sleeve (11) and a valve core (13) which are separately arranged; A nut member (12), including a fitting section (121), the fitting section (121) being limited between the connecting sleeve (11) and the valve core (13) to restrict the movement of the nut member (12); The connecting sleeve (11) has a stepped hole (111) and a first stepped surface (1111) is provided in the stepped hole (111); the fitting section (121) of the nut member (12) is arranged in the stepped hole (111), one end of the fitting section (121) has a second stepped surface (1211), and the second stepped surface (1211) abuts against the first stepped surface (1111); the valve core (13) abuts against the other end of the fitting section (121).

2. The valve body assembly according to claim 1, wherein, A third stepped surface (1112) spaced from the first stepped surface (1111) is further provided in the stepped hole (111); the valve core (13) and the connecting sleeve (11) are fixedly connected, and one end of the valve core (13) arranged in the stepped hole (111) is in stop fit with the third stepped surface (1112); the other end of the fitting section (121) abuts against one end of the valve core (13) arranged in the stepped hole (111).

3. The valve body assembly according to claim 2, wherein, The distance between the first stepped surface (1111) and the third stepped surface (1112) is L, and the distance between the second stepped surface (1211) and the other end of the fitting section (121) is H, and H≥L.

4. The valve body assembly according to claim 1, characterized in that The fitting section (121) is located in the connecting sleeve (11) and is in clearance fit with the inner wall of the cavity of the connecting sleeve (11); The valve core (13) is welded to the connecting sleeve (11), or the valve core (13) is in interference fit with the inner wall of the cavity of the connecting sleeve (11).

5. The valve body assembly according to claim 1, characterized in that, The valve core (13) includes a main body (131) extending into the connecting sleeve (11) and a limiting protrusion (132) provided on the main body (131), the limiting protrusion (132) extending into the cavity of the fitting section (121) and being in interference or transitional fit with the inner wall of the cavity of the fitting section (121), and the main body (131) abuts against one end of the fitting section (121).

6. The valve body assembly according to claim 1, wherein The nut member (12) is formed by resin injection molding, and the connecting sleeve (11) and the valve core (13) are formed by metal processing.

7. The valve body assembly according to claim 2, wherein, The stepped hole (111) includes a first hole section (1113), a second hole section (1114), and a third hole section (1115) that are sequentially connected and have sequentially increasing diameters. A first step surface (1111) is formed between the first hole section (1113) and the second hole section (1114), and a third step surface (1112) is formed between the second hole section (1114) and the third hole section (1115). The fitting section (121) includes a first sub-section (1212) and a second sub-section (1213) that are connected to each other. The outer diameter of the first sub-section (1212) is smaller than that of the second sub-section (1213), and a second step surface (1211) is formed therebetween.

8. The valve body assembly according to claim 1, wherein, The nut member (12) further includes a limiting portion. The connecting sleeve (11) or the valve core (13) is provided with a mating portion. The limiting portion is in limiting cooperation with the mating portion to limit the rotation of the nut member (12) around the axis of the valve body assembly.

9. The valve body assembly according to claim 8, wherein, The limiting portion of the nut member (12) is a positioning rib (123), and the mating portion of the connecting sleeve (11) or the valve core (13) is a positioning groove (1116). At least a part of the positioning rib (123) is located in the positioning groove (1116).

10. The valve body assembly according to claim 9, wherein The positioning rib (123) protrudes from the outer wall of the fitting section (121) and extends along the axial direction of the valve body assembly. The positioning groove (1116) is provided on the inner wall of the cavity of the connecting sleeve (11) and extends along the axial direction of the valve body assembly.

11. The valve body assembly according to claim 9, characterized in that, The valve body assembly further includes a sleeve (14). The sleeve (14) and the valve core (13) are connected to form an installation cavity. The nut member (12) is disposed in the installation cavity and divides the installation cavity into an upper sub-cavity (101) and a lower sub-cavity (102). The nut member (12) has a balance hole (1214). Two ends of the balance hole (1214) are respectively communicated with the positioning groove (1116) and the lower sub-cavity (102).

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