Thermal expansion valve

Abstract

A medium-temperature and high-pressure liquid refrigerant is throttled into low-pressure and low-temperature wet steam through an expansion valve, the low-pressure and low-temperature wet steam enters an evaporator to absorb heat so as to achieve the refrigeration effect, if the structural design of the expansion valve is poor, the expansion valve can vibrate during operation, vibration can generate noise, the service life of the expansion valve can be affected, and the comfort degree of a driver and passengers can also be affected. The expansion valve has the advantages that the spiral springs and the steel balls are arranged in the radial mounting holes of the steel ball seat assembly and are uniformly distributed at an angle of 120 degrees, so that impact force on the steel ball seat assembly from all directions in an air conditioning system through an inlet of the expansion valve can be effectively absorbed; the frequency of impact of flow from an air conditioning system on the steel ball seat assembly can be well reduced, and the resonance phenomenon of the expansion valve can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile air conditioner, more specifically, relate to a thermal expansion valve. BACKGROUND

[0002] Thermal expansion valve is the important component of the refrigeration device of automobile air conditioner, and is one of four components of the refrigeration system of automobile air conditioner. Expansion valve makes liquid refrigerant of medium temperature and high pressure into low pressure and low temperature wet steam, enters evaporator and absorbs heat to achieve the effect of refrigeration, and if the structure design of expansion valve is poor, vibration will occur during operation, and the vibration will produce noise, which not only affects the service life of expansion valve, but also affects the comfort of the driver and passenger.

[0003] The structure of the known thermal expansion valve is shown in Figure 1 It is mainly composed of thermal head 1, valve body 2, transmission rod 3, valve needle 4, steel ball seat assembly 5, spring 6 and adjusting stud 7. The main source of vibration is that the medium temperature and high pressure refrigerant directly impacts the steel ball seat assembly 5, the steel ball seat assembly 5 is impacted to vibrate, so that the steel ball seat assembly 5 directly impacts the valve port in the valve body 2, thereby generating high-frequency vibration and noise. This vibration directly affects the stable operation of the expansion valve, and if the frequency is similar to the vibration frequency of the compressor, resonance phenomenon will occur. The vibration of the expansion valve is intensified, which directly affects the service life of the expansion valve, and generates huge noise during operation, which affects the comfort of the driver and passenger. SUMMARY

[0004] The thermal expansion valve of the utility model solves the above-mentioned defects, provides a novel thermal expansion valve structure, which is compact in structure, stable in performance, improves the durable life, and can be widely applied to the field of automobile air conditioning system.

[0005] The thermal expansion valve of the utility model mainly includes thermal head, valve body, transmission rod, valve needle, steel ball seat assembly, spring, adjusting stud and the like. Its characterized in that: the steel ball seat assembly is radially provided with mounting holes, and the mounting holes are provided with spiral springs and steel balls.

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

[0007] The steel ball seat assembly is radially provided with three mounting holes, and the three mounting holes are provided with spiral springs and steel balls, and the three mounting holes are evenly distributed at an angle of 120 degrees.

[0008] The steel ball abuts against the side wall of the valve body.

[0009] The surface of the steel ball is knurled, and the roughness Ra is greater than 12.5um.

[0010] Compared with the prior art, the advantages of the utility model lie in: because the spiral spring and the steel ball are arranged in the radial installation hole of the steel ball seat assembly and are uniformly distributed at 120 degrees, the impact force of the steel ball seat assembly from each direction through the inlet of the expansion valve in the air conditioning system can be effectively absorbed, the frequency of the flow from the air conditioning system impacting the steel ball seat assembly can be well reduced, and the resonance phenomenon of the expansion valve can be solved. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0013] Figure 3 It is a plan view of a steel ball seat assembly of a thermal expansion valve of the utility model.

[0014] 1-thermal head, 2-valve body, 3-transmission rod, 4-valve needle, 5-steel ball seat assembly, 6-spring, 7-adjusting stud, 21-valve body side wall, 51-steel ball, 52-spiral spring, 53-installation hole DETAILED DESCRIPTION

[0015] As shown in Figure 2 , Figure 3 the utility model mainly comprises a thermal head 1, a valve body 2, a transmission rod 3, a valve needle 4, a steel ball seat assembly 5, a spring 6 and an adjusting stud 7; the steel ball seat assembly 5 is radially provided with an installation hole 53, and the installation hole 53 is internally provided with a spiral spring 52 and a steel ball 51. The steel ball seat assembly 5 is radially provided with three installation holes 53, and the three installation holes 53 are all provided with the spiral spring 52 and the steel ball 51, and the three installation holes 53 are uniformly distributed at 120 degrees. The steel ball 51 abuts against the valve body side wall 21. The surface of the steel ball 51 adopts knurling, and the roughness Ra is greater than 12.5um.

[0016] Compared with the prior art, the advantages of the utility model lie in: because the spiral spring 52 and the steel ball 51 are arranged in the radial installation hole 53 of the steel ball seat assembly 5 and are uniformly distributed at 120 degrees, the impact force of the steel ball seat assembly 5 from each direction through the inlet of the expansion valve in the air conditioning system can be effectively absorbed, the frequency of the flow from the air conditioning system impacting the steel ball seat assembly 5 can be well reduced, and the resonance phenomenon of the expansion valve can be solved.

[0017] The above examples are only used to illustrate but not to limit the technical scheme of the utility model. Any modification or partial replacement without departing from the spirit and scope of the utility model shall be covered in the claim range of the utility model.

Claims

1. A thermal expansion valve, comprising a thermal head (1), a valve body (2), a transmission rod (3), a valve needle (4), a steel ball seat assembly (5), a spring (6), and an adjusting stud (7); characterized in that: The steel ball seat assembly (5) is radially provided with a mounting hole (53); the mounting hole (53) is provided with a spiral spring (52) and a steel ball (51).

2. The thermal expansion valve according to claim 1, characterized in that: The steel ball seat assembly (5) is radially provided with three mounting holes (53), and each of the three mounting holes (53) is provided with a spiral spring (52) and a steel ball (51), and the three mounting holes (53) are evenly distributed at an angle of 120°.

3. The thermal expansion valve according to claim 1, characterized in that: The steel ball (51) abuts against the valve body side wall (21).

4. The thermal expansion valve according to claim 1, characterized in that: The surface of the steel ball (51) is knurled, and the roughness Ra is greater than 12.5um.

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