Thermostatic expansion valve

Abstract

The utility model discloses a thermal expansion valve mainly comprises heat head, valve body, transmission rod, spring, adjusting stud and valve needle steel ball assembly. Since the steel ball and the valve needle are designed as an integral structure, the impact and abnormal sound caused by the pressure fluctuation of the steel ball in the traditional split structure are avoided, the thermal expansion valve runs more stably and reliably under the complex automobile air conditioning working condition. The spring is centrally positioned through the adjusting stud with the conical column, the accuracy of spring force application is guaranteed, the opening consistency of the thermal expansion valve is better, and the temperature control precision of the system is improved. The design simplifies the steel ball seat assembly, saves the separate steel ball seat, not only reduces the manufacturing cost of the material, but also simplifies the assembly process and improves the production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning, and more specifically, to a thermal expansion valve. Background Technology

[0002] Thermostatic expansion valve is an important component of automotive air conditioning refrigeration system and one of the four major components of automotive air conditioning refrigeration system. Thermostatic expansion valve is a throttling component commonly used in automotive air conditioning. It can throttle and reduce the pressure of liquid refrigerant from condenser, and adjust the flow rate of refrigerant from condenser to evaporator according to the temperature of evaporator outlet to adapt to the ever-changing needs of cooling load.

[0003] The structure of existing thermal expansion valves is as follows: Figure 1 As shown, it mainly consists of a heating head 1, valve body 2, transmission rod 3, valve needle 4, steel ball seat assembly 5, spring 6, and adjusting stud 7. In this structure, there are two key issues affecting performance and cost: First, due to unavoidable machining and assembly tolerances, a radial clearance exists when assembling the spring 6 and adjusting stud 7. This clearance causes the spring to move radially during operation, thus disturbing the center position of the steel ball seat assembly 5 in the valve orifice, ultimately affecting the accuracy and stability of the expansion valve's opening. Second, the steel ball seat assembly 5 has a complex structure and requires advanced machining processes, which directly increases the manufacturing cost of the expansion valve. Summary of the Invention

[0004] The purpose of the thermostatic expansion valve described in this utility model is to solve the above-mentioned shortcomings and provide a new thermostatic expansion valve structure that is compact, stable in performance, and low in manufacturing cost, and can be widely used in the field of automotive air conditioning systems.

[0005] The thermal expansion valve of this utility model mainly consists of a thermal head, a valve body, a transmission rod, a spring, an adjusting stud, and a valve needle and steel ball assembly; its characteristic is that the valve needle and steel ball assembly is composed of a valve needle and a steel ball; the valve needle and the steel ball are assembled into a whole by energy storage welding.

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

[0007] The adjusting stud has a tapered column; the spring is sleeved on the tapered column, and the inner diameter of the spring is slightly larger than the diameter of the large end of the tapered column.

[0008] The diameter of the steel ball is slightly larger than the inner diameter of the spring, and part of the steel ball is housed in the inner ring at the upper end of the spring.

[0009] Compared with the prior art, the advantages of this utility model are:

[0010] 1. High operational stability: Because the steel ball and valve needle are designed as an integrated structure, the impact and abnormal noise caused by pressure fluctuations of the steel ball in the traditional split structure are avoided, making the thermostatic expansion valve operate more smoothly and reliably under the complex automotive air conditioning conditions.

[0011] 2. Good control precision: The spring is centered by an adjusting stud with a tapered column, which ensures the accuracy of the spring force application, resulting in good consistency of the opening degree of the thermostatic expansion valve and improving the temperature control precision of the system.

[0012] 3. Simple structure and low cost: This design simplifies the steel ball seat assembly, eliminating the need for a separate steel ball seat, which not only reduces the manufacturing cost of materials but also simplifies the assembly process and improves production efficiency. Attached Figure Description

[0013] Figure 1 Here is a structural diagram of a known thermal expansion valve;

[0014] Figure 2 This is a structural diagram of a thermostatic expansion valve according to the present invention;

[0015] Figure 3 This is a structural diagram of the valve needle steel ball assembly of a thermostatic expansion valve according to the present invention;

[0016] Figure 4 This is a structural diagram of the adjusting stud of a thermostatic expansion valve according to the present invention.

[0017] 1-Heat head, 2-Valve body, 3-Transmission rod, 4-Valve needle, 5-Steel ball seat assembly, 6-Spring, 7-Adjusting stud, 8-Valve needle steel ball assembly, 71-Conical column, 81-Valve needle, 82-Steel ball Detailed Implementation

[0018] like Figure 2 , Figure 3 , Figure 4 As shown, this utility model mainly consists of a heating head 1, a valve body 2, a transmission rod 3, a spring 6, an adjusting stud 7, and a valve needle and steel ball assembly 8. The valve needle and steel ball assembly 8 consists of a valve needle 81 and a steel ball 82. The valve needle 81 and the steel ball 82 are assembled into a whole by energy storage welding. The adjusting stud 7 has a tapered column 71. The spring 6 is sleeved on the tapered column 71, and the inner diameter of the spring 6 is slightly larger than the diameter of the large end of the tapered column 71. The diameter of the steel ball 82 is slightly larger than the inner diameter of the spring 6, and part of the steel ball 82 is housed in the inner ring of the upper end of the spring 6.

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] By integrating the steel ball 82 and valve needle 81 into a single structure, the impact and abnormal noise caused by pressure fluctuations in the steel ball 82, as seen in traditional separate structures, are avoided. This allows the thermostatic expansion valve to operate more smoothly and reliably under complex automotive air conditioning conditions. The spring 6 is centered via the adjusting stud 7 with a tapered column 71, ensuring accurate application of spring force and resulting in better consistency in the opening degree of the thermostatic expansion valve, thus improving the system's temperature control accuracy. This design simplifies the steel ball seat assembly 5, eliminating the need for a separate steel ball seat, which not only reduces material manufacturing costs but also simplifies the assembly process and improves production efficiency.

[0021] The above examples are for illustrative purposes only and are not intended to limit the technical solutions of this utility model. Any modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered by the claims of this utility model.

Claims

1. A thermostatic expansion valve, mainly composed of a thermostatic head (1), a valve body (2), a transmission rod (3), a spring (6), an adjusting stud (7), and a valve needle ball assembly (8); characterized in that: The valve needle and steel ball assembly (8) consists of a valve needle (81) and a steel ball (82); the valve needle (81) and the steel ball (82) are assembled into a whole by energy storage welding.

2. A thermostatic expansion valve according to claim 1, characterized in that: The adjusting stud (7) has a tapered post (71); the spring (6) is sleeved on the tapered post (71), and the inner diameter of the spring (6) is slightly larger than the large end diameter of the tapered post (71).

3. A thermostatic expansion valve according to claim 1, characterized in that: The diameter of the steel ball (82) is slightly larger than the inner diameter of the spring (6), and part of the steel ball (82) is housed in the inner ring at the upper end of the spring (6).

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