Thermal expansion valve

Abstract

A thermostatic expansion valve is an important part for forming an automobile air conditioner refrigerating device, is one of four parts of an automobile air conditioner refrigerating system, throttles and depressurizes a high-temperature and high-pressure liquid refrigerant from a condenser into a low-temperature and low-pressure liquid refrigerant, and adjusts the flow of the refrigerant fed into an evaporator according to the superheat degree of an outlet of the evaporator. The thermal expansion valve mainly comprises a thermal head, a valve body, a transmission rod, a valve needle, a steel ball seat assembly, a spring, an adjusting stud and the like. Compared with the prior art, the expansion valve has the advantages that due to the fact that the three valve needles act on the upper plane of the steel ball seat assembly and are distributed at the angle of 120 degrees, the acting force is stable, the consistency of gaps of valve ports is good, and the flow consistency of the expansion valve is stable. As the valve needle is not located at the valve port, the valve needle cannot influence the flow of the valve port, and the expansion valve with the structure can solve the problem that the flow of an air conditioning system is small.

Description

TECHNICAL FIELD

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

[0002] Thermal expansion valve is an important component of automobile air conditioner refrigeration device, is one of four components of automobile air conditioner refrigeration system, and thermal expansion valve throttles and depressurizes high-temperature high-pressure liquid refrigerant from condenser into low-temperature low-pressure liquid refrigerant, and adjusts the refrigerant flow into evaporator according to the superheat degree of evaporator outlet. The control principle of expansion valve to refrigerant flow is that thermal head senses evaporator outlet temperature and pressure, and then thermal head transmits force to transmission rod, and force is transmitted to valve needle through transmission rod, and the opening of valve port is adjusted by the position of steel ball pushed by valve needle on valve port, so that suitable refrigerant enters evaporator, and evaporator can exert better refrigeration effect.

[0003] The structure of the known thermal expansion valve is shown in Figure 1 It mainly consists of thermal head 1, valve body 2, transmission rod 3, valve needle 4, steel ball seat assembly 5, spring 6 and adjusting stud 7. Since there is a certain gap in the assembly process of valve body 2 and valve needle 4, the contact between the bottom surface of valve needle 4 and the top end of steel ball seat assembly 5 is not centered, so that the gap between steel ball seat assembly 5 and valve needle 4 is inconsistent at the same opening, resulting in poor flow consistency of expansion valve. In addition, valve needle 4 is always in the flow channel hole of valve body 2, resulting in the existence of flow channel hole always cutting off, which cannot meet the demand of large flow. SUMMARY

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

[0005] The thermal expansion valve of the utility model mainly comprises thermal head, valve body, transmission rod, valve needle, steel ball seat assembly, spring, adjusting stud and the like, characterized in that: the valve needle acts on the upper plane of the steel ball seat assembly.

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

[0007] The valve needle acting on the upper plane of the steel ball seat assembly is composed of three valve needles and is distributed at an angle of 120 degrees;

[0008] The bottom end of the transmission rod is provided with a circular positioning recess corresponding to the valve needles distributed at an angle of 120 degrees, and the valve needles are positioned through the circular positioning recess;

[0009] Compared with the prior art, the expansion valve has the advantages that: the three valve needles act on the upper plane of the steel ball seat assembly and are distributed at an angle of 120°, the acting force is stable, the consistency of the valve port gap is good, and the flow consistency of the expansion valve is also relatively stable. Since the valve needles are not at the valve port, the valve needles do not affect the flow of the valve port, and therefore the expansion valve of the structure can solve the problem of small flow of the air conditioning system. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structural view of a known thermal expansion valve;

[0011] 1-thermal head, 2-valve body, 3-transmission rod, 4-valve needle, 5-steel ball seat assembly, 6-spring, 7-adjusting

[0012] stud

[0013] Figure 2 It is a structural view 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

[0015] stud

[0016] Figure 3 It is a bottom view of a transmission rod 3 of a thermal expansion valve of the utility model. DETAILED DESCRIPTION

[0017] As Figure 2 , Figure 3 shown, the utility model mainly consists of 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 valve needle 4 acts on the upper plane of the steel ball seat assembly 5. The valve needle 4 acting on the upper plane of the steel ball seat assembly 5 is composed of three valve needles and is distributed at an angle of 120°. The bottom end of the transmission rod 3 is provided with a circular positioning recess corresponding to the valve needle 4 distributed at an angle of 120°, and the valve needle 4 is positioned through the circular positioning recess.

[0018] Compared with the prior art, the utility model has the advantages that: the three valve needles 4 act on the upper plane of the steel ball seat assembly 5 and are distributed at an angle of 120°, the acting force is stable, the consistency of the valve port gap is good, and the flow consistency of the expansion valve is also relatively stable. Since the valve needle 4 is not at the valve port, the valve needle 4 does not affect the flow of the valve port, and therefore the expansion valve solves the problem of small flow of the air conditioning system through the change of its own structure.

[0019] The above examples are only used to illustrate but not to limit the technical solutions of the present application. Any modification or partial replacement without departing from the spirit and scope of the present application shall be covered in the scope of the claims of the present application.

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 valve needle (4) acts on the upper plane of the steel ball seat assembly (5); the valve needle (4) acting on the upper plane of the steel ball seat assembly (5) is composed of three valve needles, which are distributed at an angle of 120 degrees.

2. A thermal expansion valve according to claim 1, characterized in that: The bottom end of the transmission rod (3) is provided with a circular positioning recessed platform distributed at an angle of 120° corresponding to the valve needle (4), and the valve needle (4) is positioned by the circular positioning recessed platform.

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