Valve needle assembly and electronic expansion valve

Abstract

The valve needle assembly comprises an outer valve needle assembly and an inner valve needle, the outer valve needle assembly comprises a valve needle sleeve and an outer valve needle, the valve needle sleeve is installed on the outer valve needle, an open hole is formed in the bottom of the outer valve needle, a side hole communicated with the open hole is formed in the side edge of the outer valve needle, and the valve needle sleeve is installed on the inner valve needle. An inner valve needle sliding axially is installed in the valve needle sleeve, one end of the inner valve needle is provided with a plugging portion matched with the open hole, the other end of the inner valve needle is rotatably connected with a screw rod, one end of the screw rod penetrates through the valve needle sleeve, a valve needle spring is installed on the valve needle sleeve, and the valve needle spring is arranged on the outer side of the screw rod in a sleeved mode. The position of the original built-in valve needle spring is changed and arranged on the valve needle sleeve, so that the limitation on the specification of the valve needle spring is reduced, and the problem of distortion and deformation can be reduced by using the large-specification valve needle spring.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to a valve needle assembly and an electronic expansion valve. Background Art

[0002] The electronic expansion valve is an electromagnetically controlled component that is used in the air-conditioning system of new energy vehicles to control the on / off of the medium or adjust parameters such as the flow rate of the medium. It is generally divided into a refrigerant circuit and a coolant circuit. Under different working conditions, the demand for refrigerant flow is different.

[0003] In order to meet the requirements of different thermal management modes of new energy vehicles and reduce the number of integrated module valves used to reduce costs, the use of dual valve needle technology has become the current main technical route. At present, conventional dual valve needle assemblies, such as the application number 202220250087.8, are named electronic expansion valves. The valve needle spring is installed inside the outer valve needle assembly. The upper end of the valve needle spring supports the inner valve needle. Due to the limitation of the internal space of the outer valve needle assembly, the specifications of the valve needle spring are also limited. Only some small-sized valve needle springs can be used. The valve needle spring is prone to distortion and other problems. Of course, there are other problems. For example, the air inlet of the outer valve needle assembly is sealed with a soft sealing gasket, which has a general service life; there is also a sealing ring between the outer valve needle and the inner valve needle. An annular inner groove is opened in the outer valve needle, and the sealing ring is installed in the annular inner groove. The requirements for directly processing the annular inner groove on the outer valve needle are relatively high. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a valve needle assembly and an electronic expansion valve, in which the originally built-in valve needle spring is changed to be set on the valve needle sleeve, thereby reducing the restrictions on the specifications of the valve needle spring. The use of a large-sized valve needle spring can reduce the problem of twisting and deformation.

[0005] The technical solution adopted by the utility model to solve its technical problems is: to provide a valve needle assembly, including an outer valve needle assembly and an inner valve needle, the outer valve needle assembly includes a valve needle sleeve and the outer valve needle, the outer valve needle is installed with a valve needle sleeve, the bottom of the outer valve needle is provided with an opening, the side of the outer valve needle is provided with a side hole connected to the opening, an axially sliding inner valve needle is installed in the valve needle sleeve, one end of the inner valve needle is provided with a sealing portion that cooperates with the opening, the other end of the inner valve needle is rotatably connected with a screw, one end of the screw passes through the valve needle sleeve, a valve needle spring is installed on the valve needle sleeve, and the valve needle spring sleeve is arranged on the outside of the screw.

[0006] As a supplement to the technical solution described in the utility model, a sealing ring is embedded and installed at the lower end of the opening, and the sealing ring is made of hard metal material.

[0007] As a supplement to the technical solution described in the utility model, the valve needle sleeve and the outer valve needle are fixed together by interference fit through welding.

[0008] As a supplement to the technical solution described in the utility model, the valve needle sleeve is provided with a through hole for the screw to pass through, and a circle of limiting convex ring is arranged around the through hole on the valve needle sleeve, and the valve needle spring is sleeved on the outside of the limiting convex ring.

[0009] As a supplement to the technical solution described in the utility model, an installation groove is provided at the top of the outer valve needle, a sealing ring is installed in the installation groove, the sealing portion passes through the sealing ring, and a pressure ring is installed at the upper end of the installation groove, which presses the sealing ring.

[0010] As a supplement to the technical solution described in the utility model, the upper end surface of the pressure ring protrudes from the upper end surface of the outer valve needle, and the upper end surface of the pressure ring is used to buffer the impact of the inner valve needle.

[0011] As a supplement to the technical solution described in the utility model, the pressure ring and the installation groove are interference fit and fixed together by welding.

[0012] As a supplement to the technical solution described in the utility model, the lower end of the blocking portion is in a truncated cone structure, and the cross-section of the truncated cone structure gradually decreases from top to bottom.

[0013] As a supplement to the technical solution described in the utility model, at least one balancing hole is provided on the outer valve needle, and the balancing hole is a vertical through hole.

[0014] An electronic expansion valve comprises the valve needle assembly.

[0015] Beneficial effects: The utility model relates to a valve needle assembly and an electronic expansion valve, in which the originally built-in valve needle spring is changed to be positioned on the valve needle sleeve, thereby reducing the restrictions on the specifications of the valve needle spring, and the use of a large-sized valve needle spring can reduce the problem of twisting and deformation; at the same time, a circle of limiting convex rings is arranged on the valve needle sleeve, and the lower part of the valve needle spring is limited by the limiting convex ring, which can effectively reduce the position change of the valve needle spring; the sealing ring made of hard metal material is a hard seal, which has a better service life and friction resistance than conventional soft seals; an installation groove is provided on the top of the outer valve needle, and the inner wall of the installation groove cooperates with the pressure ring to limit the sealing ring, which is easy to install and simple to process, and the upper end face of the pressure ring protrudes from the upper end face of the outer valve needle, and the upper end face of the pressure ring is used to buffer the impact of the inner valve needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an application schematic diagram of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 This utility model Figure 2 A partial enlarged view of

[0019] Figure 4 It is a structural schematic diagram of the utility model.

[0020] Illustration: 1. Valve seat assembly, 2. Nut assembly, 3. Valve needle spring, 4. Outer valve needle assembly, 5. Inner valve needle, 6. Valve port, 7. Hollow, 8. Screw, 9. Valve needle sleeve, 10. Outer valve needle, 11. Sealing ring, 12. Balance hole, 13. Sealing part, 14. Sealing ring, 15. Side hole, 16. Opening, 17. Limiting convex ring, 18. Through hole, 19. Magnetic rotor assembly, 20. Installation groove, 21. Pressing ring. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0022] The embodiments of the present utility model relate to a valve needle assembly and an electronic expansion valve, such as Figure 1-4 As shown, the electronic expansion valve includes a valve seat assembly 1, a valve needle assembly, a nut assembly and a magnetic rotor assembly 19. The valve seat assembly 1 has a valve needle assembly installed inside, and the valve seat assembly 1 has a nut assembly installed on the upper part. When the electronic expansion valve starts to work, the magnetic rotor assembly 19 rotates under the action of the excitation magnetic field, thereby driving the screw 5 to rotate. The nut assembly is threadedly connected to the screw 5, further driving the valve needle assembly to move, so as to realize the change of the opening of the valve port of the electronic expansion valve, thereby achieving the purpose of regulating the flow and pressure of the fluid medium.

[0023] The valve needle assembly comprises an outer valve needle assembly 4 and an inner valve needle 5. The outer valve needle assembly 4 comprises a valve needle sleeve 9 and an outer valve needle 10. The outer valve needle 10 is mounted with a valve needle sleeve 9. An opening 16 is provided at the bottom of the outer valve needle 10. A side hole 15 connected to the opening 16 is provided on the side of the outer valve needle 10. An axially sliding inner valve needle 5 is mounted in the valve needle sleeve 9. A sealing portion 13 cooperating with the opening 16 is provided at one end of the inner valve needle 5. A screw rod 8 is rotatably connected to the other end of the inner valve needle 5. One end of the screw rod 8 passes through the valve needle sleeve 9. A valve needle spring 3 is mounted on the valve needle sleeve 9. The valve needle spring 3 is sleeved on the outside of the screw rod 8.

[0024] A valve port 6 is provided at the bottom of the valve seat assembly 1, and a hollow portion 7 connected to the valve port 6 is provided on the side of the valve seat assembly 1. When the screw 8 rotates, the inner valve needle 5 will move upward with the screw 8, and the outer valve needle assembly 4 is kept stationary by the valve needle spring 3. The inner valve needle 5 and the axial movement of the blocking portion 13 open the opening 16, and the medium enters from the opening 16 and then goes out through the side hole 15. The gap between the sealing surface of the blocking portion 11 and the sealing surface of the opening 16 is changed by controlling the up and down movement of the inner valve needle 5, so as to achieve the effect of regulating a small flow rate; when the upper end of the inner valve needle 5 presses against the outer valve needle 10, as the screw 8 rotates, the outer valve needle 10 will move upward with the inner valve needle 5, and the gap between the sealing surface of the lower end of the outer valve needle 10 and the sealing surface of the valve port 6 is changed by controlling the up and down movement of the outer valve needle 10, so as to achieve the effect of regulating a large flow rate.

[0025] Reference Figure 2 and Figure 3 As shown, a sealing ring 11 is embedded and installed at the lower end of the opening 16, and the sealing ring 11 is made of hard metal material; the sealing ring 11 made of hard metal material is a hard seal, and compared with conventional soft seals, the hard seal has a better service life and friction resistance.

[0026] Reference Figure 2 and Figure 3 As shown, the valve needle sleeve 9 and the outer valve needle 10 are fixed together by interference fit through welding, which can effectively ensure the connection strength and structural stability between the two.

[0027] Reference Figure 3 As shown, the valve needle sleeve 9 is provided with a through hole 18 for the screw rod 8 to pass through, and a circle of limiting convex ring 17 is arranged around the through hole 18 on the valve needle sleeve 9. The valve needle spring 3 is sleeved on the outside of the limiting convex ring 17, and the lower part of the valve needle spring 3 is limited by the limiting convex ring 17. Moreover, the valve needle sleeve 9 and the limiting convex ring 17 are integrally formed, and the two components have good structural stability and connection strength.

[0028] The utility model changes the position of the originally built-in valve needle spring 3 and sets it on the valve needle sleeve 9, which reduces the restrictions on the specifications of the valve needle spring 3. The use of a large-sized valve needle spring 3 can reduce the problem of twisting and deformation. At the same time, a circle of limiting convex rings 17 are arranged on the valve needle sleeve 9. The limiting convex rings 17 are used to limit the lower part of the valve needle spring 3, which can effectively reduce the position change of the valve needle spring 3.

[0029] Reference Figure 2 and Figure 3As shown, a mounting groove 20 is provided at the top of the outer valve needle 10, and a sealing ring 14 is installed in the mounting groove 20. The sealing portion 13 passes through the sealing ring 14, and a pressure ring 21 is installed at the upper end of the mounting groove 20, and the pressure ring 21 presses the sealing ring 14; the pressure ring 21 and the mounting groove 20 are interference fit and fixed together by welding, which can effectively ensure the connection strength and structural stability between the two; a mounting groove 20 is provided at the top of the outer valve needle 10, and the inner wall of the mounting groove 20 cooperates with the pressure ring 21 to limit the sealing ring 14, which is convenient to install and simple to process. The mounting groove 20 and the pressure ring 21 together form an annular inner groove, and the upper end face of the pressure ring 21 protrudes from the upper end face of the outer valve needle 10, and the upper end face of the pressure ring 21 is used to buffer the impact of the inner valve needle 5.

[0030] The lower end of the blocking portion 13 is in a truncated cone structure, and the cross section of the truncated cone structure gradually decreases from top to bottom.

[0031] Reference Figure 3 and Figure 4 As shown, at least one balancing hole 12 is provided on the outer valve needle 10. The balancing hole 12 is a vertical through hole. The balancing hole 12 is used to connect the inside of the valve needle with the outside of the electronic expansion valve to balance the internal and external pressures. As a preferred embodiment of the balancing hole 12, there are three balancing holes 12, which are evenly arranged around the sealing ring 11.

[0032] An electronic expansion valve comprises the valve needle assembly.

[0033] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0036] The above is a detailed introduction to a valve needle assembly and an electronic expansion valve provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A valve needle assembly, comprising an outer valve needle assembly (4) and an inner valve needle (5), characterized in that: The outer valve needle assembly (4) comprises a valve needle sleeve (9) and an outer valve needle (10), the valve needle sleeve (9) being installed on the outer valve needle (10), the outer valve needle (10) having an opening (16) at the bottom, the outer valve needle (10) having a side hole (15) connected to the opening (16) at the side, an axially sliding inner valve needle (5) being installed in the valve needle sleeve (9), one end of the inner valve needle (5) being provided with a sealing portion (13) cooperating with the opening (16), the other end of the inner valve needle (5) being rotatably connected with a screw rod (8), one end of the screw rod (8) passing through the valve needle sleeve (9), the valve needle sleeve (9) being installed with a valve needle spring (3), the valve needle spring (3) being sleeved on the outside of the screw rod (8).

2. A valve needle assembly according to claim 1, characterized in that: A sealing ring (11) is embedded and installed at the lower end of the opening (16), and the sealing ring (11) is made of hard metal material.

3. A valve needle assembly according to claim 1, characterized in that: The valve needle sleeve (9) and the outer valve needle (10) are fitted with each other by interference and are fixed together by welding.

4. A valve needle assembly according to claim 1, characterized in that: The valve needle sleeve (9) is provided with a through hole (18) for the screw rod (8) to pass through, and a circle of limiting convex ring (17) is arranged around the through hole (18) on the valve needle sleeve (9), and the valve needle spring (3) is sleeved on the outside of the limiting convex ring (17).

5. The valve needle assembly according to claim 1, characterized in that: The outer valve needle (10) is provided with a mounting groove (20) at the top, a sealing ring (14) is installed in the mounting groove (20), the blocking portion (13) passes through the sealing ring (14), and a pressure ring (21) is installed at the upper end of the mounting groove (20), and the pressure ring (21) presses the sealing ring (14).

6. A valve needle assembly according to claim 5, characterized in that: The upper end surface of the pressure ring (21) protrudes from the upper end surface of the outer valve needle (10), and the upper end surface of the pressure ring (21) is used to buffer the impact of the inner valve needle (5).

7. A valve needle assembly according to claim 5, characterized in that: The pressure ring (21) and the mounting groove (20) are fitted with each other by interference and are fixed together by welding.

8. A valve needle assembly according to claim 1 or 5, characterized in that: The lower end of the blocking portion (13) is in a truncated cone-shaped structure, and the cross-section of the truncated cone-shaped structure gradually decreases from top to bottom.

9. The valve needle assembly according to claim 1, characterized in that: The outer valve needle (10) is provided with at least one balancing hole (12), and the balancing hole (12) is a vertical through hole.

10. An electronic expansion valve, characterized in that: The electronic expansion valve comprises a valve needle assembly as claimed in any one of claims 1 to 9.

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