Thermal expansion valve

Abstract

The utility model discloses a thermostatic expansion valve, which belongs to the technical field of vapor compression refrigeration and is suitable for an automobile air conditioning system. Mainly comprises a thermal head 1, an O-shaped ring 2, a valve body 3, a transmission rod valve needle assembly 4, a steel ball assembly 5, a spring 6, an O-shaped ring 7 and an adjusting stud 8, wherein the transmission rod valve needle assembly 4 comprises a transmission rod 41, a sealing ring 42 and a valve needle 43. The sealing ring 42 and the valve needle 43 are positioned through a groove, and the transmission rod 41 and the valve needle 43 are connected into a whole through threads. The sealing ring is installed on the valve needle 43, a guide tool needed during installation is omitted, the valve needle 43 and the transmission rod 41 are connected into a whole, a guide tool needed for placing the valve needle 43 into the valve body 3 is omitted, and the sealing ring valve has the advantages of being compact in structure, convenient to assemble parts and high in production efficiency.

Description

Technical Field

[0001] The utility model relates to a thermal expansion valve, which belongs to the technical field of vapor compression refrigeration and is suitable for various thermal expansion valves in automobile air-conditioning systems. Background Art

[0002] Thermostatic expansion valve is a basic component in automotive air conditioners. At present, there are many manufacturers producing thermostatic expansion valves, and the competition is very fierce. It is becoming more and more important to continuously improve the production efficiency of valves.

[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, an O-ring A 2, a valve body 3, a transmission rod 4, a sealing ring 5, a valve needle 6, a steel ball assembly 7, a spring 8, an O-ring B 9, and an adjusting stud 10. The assembly of parts in this structure has the following inconveniences: first, it takes a long time to assemble the sealing ring 5 onto the transmission rod 4, because the inner diameter of the sealing ring 5 is small, while the wire diameter is large. The sealing ring 5 needs to be installed on the transmission rod 4, whose outer diameter is more than twice the inner diameter of the sealing ring 5. This process requires the help of a guide tooling to complete, and the production efficiency is not high; second, it takes a long time to assemble the valve needle 5 onto the valve body 3, and it requires the help of a guide tooling to complete, and the production efficiency is not high. The above two assembly inconveniences make the production efficiency of the expansion valve low. Summary of the invention

[0004] The purpose of the thermal expansion valve described in the utility model is to solve the above inconveniences and provide a new thermal expansion valve structure, which has a compact structure, reliable performance, and high production efficiency, 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, an O-ring, a valve body, a transmission rod valve needle assembly, a steel ball assembly, a spring, and an adjusting stud, and is characterized in that the transmission rod valve needle assembly consists of a transmission rod, a valve needle, and a sealing ring.

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

[0007] The transmission rod, the valve needle and the sealing ring are formed into a whole.

[0008] The internal thread on the transmission rod is connected with the external thread on the valve needle.

[0009] The sealing ring is positioned with the valve needle through the groove.

[0010] The utility model assembles the transmission rod, the valve needle and the sealing ring into a whole, thereby eliminating the need for assembly guide tooling, shortening the parts assembly time and improving the production efficiency.

[0011] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural diagram of a known thermal expansion valve;

[0013] 1-thermal head, 2-O-ring A, 3-valve body, 4-transmission rod, 5-sealing ring, 6-valve needle, 7-steel ball assembly, 8-spring, 9-O-ring B, 10-adjusting stud

[0014] Figure 2 This is a structural diagram of the thermal expansion valve of the utility model;

[0015] 1-thermal head, 2-O-ring A, 3-valve body, 4-transmission rod valve needle assembly, 41-transmission rod, 41a-internal thread, 42-sealing ring, 43-valve needle, 43a-external thread, 43b-groove, 5-steel ball assembly, 6-spring, 7-O-ring B, 8-adjusting stud

[0016] Figure 3 It is an enlarged view of a local structure of a known thermal expansion valve;

[0017] Figure 4 It is an enlarged view of the local structure of the thermal expansion valve of the utility model. DETAILED DESCRIPTION

[0018] like Figure 2 As shown, the utility model mainly consists of a thermal head 1, an O-ring A 2, a valve body 3, a transmission rod valve needle assembly 4, a steel ball assembly 5, a spring 6, an O-ring B 7, and an adjusting stud 8. The transmission rod valve needle assembly 4 consists of a transmission rod 41, a sealing ring 42, and a valve needle 43, which are formed into a whole, the external thread 43a on the valve needle 43 is connected with the internal thread 41a on the transmission rod 41, and the sealing ring 42 is positioned by the groove 43b and the valve needle 43.

[0019] The assembly process of some parts is as follows:

[0020] First, the sealing ring 42 and the valve needle 43 are assembled, and then the valve needle 43 and the transmission rod 41 are connected to form a transmission rod valve needle assembly 4 . Finally, the transmission rod valve needle assembly 4 is assembled into the valve body 3 .

[0021] 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), an O-ring A (2), a valve body (3), a transmission rod valve needle assembly (4), a steel ball assembly (5), a spring (6), an O-ring B (7), and an adjusting stud (8); characterized in that: The transmission rod valve needle assembly (4) is composed of a transmission rod (41), a sealing ring (42), and a valve needle (43); the internal thread (41a) on the transmission rod (41) and the external thread (43a) on the valve needle (43) are connected; The sealing ring (42) is positioned by means of the groove (43b) and the valve needle (43).

2. The thermal expansion valve according to claim 1, characterized in that: The transmission rod (41), the sealing ring (42) and the valve needle (43) are formed into a whole.

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