A thermal expansion valve

Abstract

The utility model discloses a thermal expansion valve, which mainly comprises a thermal head, a sealing ring, a valve body, a transmission rod, a valve needle assembly, a steel ball seat assembly, a spring, an adjusting stud, etc. Compared with the prior art, the utility model has the advantages that: since the working conditions of the automobile air-conditioning system are relatively complex, the temperature and pressure fluctuations of the refrigerant entering the thermal expansion valve are relatively large, and in this structure, the thermal head acts on the transmission rod, and the transmission rod acts on the valve needle assembly, and through the damping clip in the valve needle assembly, some small forces are absorbed by the damping clip and do not act on the valve needle, so that the thermal expansion valve does not need to be opened and closed frequently, the opening of the thermal expansion valve is stable, so that the air outlet temperature fluctuation of the automobile air-conditioning system is stable, and the service life of the thermal expansion valve is also improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile air conditioners, and more specifically, to a thermal expansion valve. Background Art

[0002] Thermostatic expansion valve is an important component of automobile air conditioning refrigeration device, and one of the four major components of automobile air conditioning refrigeration system. Thermostatic expansion valve throttles and reduces the pressure of high-temperature and high-pressure liquid refrigerant from the condenser into low-temperature and low-pressure liquid refrigerant, and adjusts the refrigerant flow rate sent to the evaporator according to the superheat of the evaporator outlet. The control principle of the expansion valve on the refrigerant flow rate is that the thermal head senses the temperature and pressure of the evaporator outlet, and then the thermal head transmits the force to the transmission rod, and then transmits the force to the valve needle through the transmission rod. The valve needle pushes the position of the steel ball acting on the valve port to adjust the opening of the valve port, so that the appropriate refrigerant enters the evaporator, so that the evaporator can play a better cooling effect.

[0003] The structure of the existing known thermal expansion valve is as follows Figure 1 As shown, it is mainly composed of a thermal head 1, a sealing ring 2, a valve body 3, a transmission rod 4, a steel ball seat assembly 6, a spring 7, an adjustment stud 8, and a valve needle 9. Due to the complex working conditions of the automobile air-conditioning system, the temperature and pressure fluctuations of the refrigerant entering the thermal expansion valve are relatively large. In this structure, the thermal head 1 directly acts on the transmission rod 4, and the transmission rod 4 directly drives the valve needle 9 to adjust the opening of the thermal expansion valve. Due to the large changes in temperature and pressure in the air-conditioning system, the thermal head 1 senses large changes in temperature and pressure, which causes the opening of the thermal expansion valve to change greatly, resulting in large temperature fluctuations at the air outlet of the air conditioner. At present, this problem is one of the most complained by customers. The frequent opening and closing of the thermal head 1 also accelerates its premature fatigue wear, resulting in a reduction in the working life of the thermal expansion valve. Summary of the invention

[0004] The purpose of the thermal expansion valve described in the utility model is to solve the above-mentioned shortcomings and provide a new thermal expansion valve structure, which has a compact structure, stable performance, and improved durability, and can be widely used in the field of automobile air-conditioning systems.

[0005] The thermal expansion valve of the utility model mainly comprises a thermal head, a sealing ring, a valve body, a transmission rod, a valve needle assembly, a steel ball seat assembly, a spring, and an adjusting stud, and is characterized in that the valve needle assembly consists of a valve needle and a damping clamp.

[0006] The utility model also includes the following additional technical features:

[0007] The valve needle and the damping clip are assembled into a whole through energy storage welding;

[0008] The convex point of the damping clip is in elastic sliding contact with the hole wall of the balancing part in the valve body;

[0009] A circular positioning boss is provided at the top end of the damping clamp, and the valve needle is positioned by the circular positioning boss.

[0010] Compared with the prior art, the utility model has the following advantages: under the complicated working conditions of the automobile air conditioning system, the temperature and pressure fluctuations of the refrigerant entering the thermal expansion valve are relatively large. In this structure, the thermal head acts on the transmission rod, and the transmission rod acts on the valve needle assembly. Through the damping clip in the valve needle assembly, some small forces are absorbed by the damping clip and do not act on the valve needle, so that the thermal expansion valve does not need to be opened and closed frequently, the opening of the thermal expansion valve is stable, and the temperature fluctuation of the air outlet of the automobile air conditioning system is stable, which also improves the life of the thermal expansion valve. The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a structural diagram of a known thermal expansion valve;

[0012] Figure 2 This is a structural diagram of a thermal expansion valve of the utility model;

[0013] Figure 3 It is an enlarged view of the local structure of a thermal expansion valve of the utility model;

[0014] Figure 4 This is a structural diagram of a valve needle assembly of a thermal expansion valve of the utility model.

[0015] 1-thermal head, 2-seal ring, 3-valve body, 4-transmission rod, 5-valve needle assembly, 6-steel ball seat assembly, 7-spring, 8-adjusting stud, 9-valve needle, 31-balance hole wall, 51-damping clamp, 52-valve needle, 51a-damping clamp convex point, 51b-circular positioning boss DETAILED DESCRIPTION

[0016] like Figure 2 , Figure 3 , Figure 4 As shown, the utility model is mainly composed of a thermal head 1, a sealing ring 2, a valve body 3, a transmission rod 4, a valve needle assembly 5, a steel ball seat assembly 6, a spring 7, and an adjusting stud 8. The valve needle assembly 5 is composed of a valve needle 52 and a damping clamp 51. The valve needle 52 and the damping clamp 51 are assembled into a whole by energy storage welding; the damping clamp convex point 51a is in elastic sliding contact with the balancing part hole wall 31 in the valve body 3; the top of the damping clamp 51 is provided with a circular positioning boss 51b, and the valve needle 52 is positioned by the circular positioning boss 51b.

[0017] Compared with the prior art, the advantages of the utility model are: under complex working conditions of the automobile air-conditioning system, the temperature and pressure fluctuations of the refrigerant entering the thermal expansion valve vary greatly. In this structure, the thermal head 1 acts on the transmission rod 4, and the transmission rod 4 acts on the valve needle assembly 5. Through the damping clamp 51 in the valve needle assembly 5, some small forces are absorbed by the damping clamp 51 and do not act on the valve needle 52, so that the thermal expansion valve does not need to be opened and closed frequently, and the opening of the thermal expansion valve is stable, so that the temperature fluctuation of the air outlet of the automobile air-conditioning system is stable, and the service life of the thermal expansion valve is also improved.

[0018] The above examples are only used to illustrate rather than limit the technical solution of the present utility model. Any modification or partial replacement that does not deviate from the spirit and scope of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A thermal expansion valve, mainly composed of a thermal head (1), a sealing ring (2), a valve body (3), a transmission rod (4), a valve needle assembly (5), a steel ball seat assembly (6), a spring (7), and an adjusting stud (8); characterized in that: The valve needle assembly (5) consists of a valve needle (52) and a damping clamp (51).

2. A thermal expansion valve according to claim 1, characterized in that: The valve needle (52) and the damping clamp (51) are assembled into a whole through energy storage welding.

3. A thermal expansion valve according to claim 1, characterized in that: The damping clamp protrusion (51a) is in elastic sliding contact with the balancing portion hole wall (31) in the valve body (3).

4. The thermal expansion valve according to claim 1, characterized in that: A circular positioning boss (51b) is provided at the top end of the damping clamp (51), and the valve needle (52) is positioned by the circular positioning boss (51b).

Images