Valve port pneumatic reshaping device for a thermal expansion valve

Abstract

The utility model discloses a valve port pneumatic shaping device of thermal expansion valve, including cylinder, pneumatic pressure head subassembly, locating sleeve, valve body and locating block constitute, pneumatic pressure head subassembly is by upper pressure head, steel ball seat and steel ball constitute. The valve body adopts the location of the locating groove in the locating plate, and the pneumatic subassembly is positioned through the locating sleeve and realizes quick, accurate centering, solves the problem of difficult manual positioning. The steel ball that is smooth and has higher hardness extrudes the valve port, and plastic deformation instead of cutting is generated, can significantly reduce the valve port surface roughness, even generates surface hardening layer, improves wear resistance. High degree of automation, high efficiency: adopts cylinder drive, can be easily integrated to the production line, realizes the automation operation, and the production efficiency is greatly improved. Simple structure, low in cost: the compact structure of device, low in manufacturing cost, easy maintenance.

Description

Technical Field

[0001] This utility model relates to a pneumatic shaping device for the valve port of a thermostatic expansion valve, belonging to the field of expansion valve throttling technology in vapor compression refrigeration systems, and is applicable to the valve port shaping of various thermostatic expansion valves. Background Technology

[0002] As a key component of automotive air conditioning systems, the thermostatic expansion valve plays a crucial role in controlling the flow rate and maintaining appropriate superheat. Its performance directly affects the cooling performance of the air conditioning system.

[0003] Leakage at the valve port is a critical parameter in thermostatic expansion valves. Excessive leakage at the valve port can negatively impact the stability of the automotive air conditioning system. Significant leakage can also lead to liquid refrigerant continuing to flow from the valve even when the air conditioning is off, posing a risk of liquid slugging into the compressor. The main causes of valve port leakage include... Figure 2 The sealing performance of the valve port 41 in the valve body 4, which is in contact with the steel ball, is problematic. While the roundness and surface roughness of the steel ball can be controlled during manufacturing, the valve port 41 is relatively deep and small in the valve body 4. It is difficult to control the roundness and roughness of the valve port during processing, and conventional inspections after processing are unlikely to detect defects in the valve port.

[0004] Due to limited processing and testing capabilities, the existing thermal expansion valves have a high leakage rate at the valve port, resulting in a low first-pass yield rate. Valve bodies 4 with leakage at the valve port 41 need to be reworked, which is difficult and inefficient, and cannot meet the requirements of mass production. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a compact and highly automated pneumatic shaping device for the valve port of a thermostatic expansion valve, so as to effectively solve the valve port leakage problem and improve production efficiency and product first-pass yield.

[0006] This utility model discloses a pneumatic shaping device for the valve port of an expansion valve, comprising a cylinder 1, a pneumatic pressure head assembly 2, a positioning sleeve 3, a valve body 4, and a positioning block 5; characterized in that: the pneumatic pressure head assembly 2 comprises an upper pressure head 21, a steel ball seat 22, and a steel ball 23; the cylinder 1 can drive the pneumatic pressure head assembly 2 to apply processing force along the axial direction of the positioning sleeve 3 through the valve port 41 of the valve body 4 on the positioning block 5; the end of the pressure head assembly 2 is provided with a steel ball 23 adapted to the shape of the valve port.

[0007] This utility model also includes the following additional technical features:

[0008] The upper pressure head 21 has an internal thread 21a in its inner hole, and the outer cylinder of the steel ball seat 22 has an external thread 22a; the upper pressure head 21 and the steel ball seat 22 are fixed by a threaded connection.

[0009] The steel ball seat 22 and the steel ball 23 are connected by energy storage welding.

[0010] The surface of the steel ball 23 is smooth with a surface roughness of Ra0.02. The surface of the steel ball 23 has been hardened and has a surface hardness of 56 to 60 HRC.

[0011] The positioning block 5 has a positioning groove 51 inside, and the valve body 4 is positioned through the positioning groove 51 in the positioning block 5.

[0012] Compared with the prior art, the pneumatic shaping device for the valve port of the expansion valve provided by this utility model has the following beneficial effects:

[0013] 1. Precise positioning: The valve body is positioned by the positioning groove in the positioning plate, and the pneumatic components are positioned by the positioning sleeve, which realizes fast and accurate centering and solves the problem of difficult manual positioning.

[0014] 2. High surface quality: The valve port is squeezed by a smooth and hard steel ball, which produces plastic deformation rather than cutting. This can significantly reduce the surface roughness of the valve port and even produce a surface hardened layer, thus improving wear resistance.

[0015] 3. High degree of automation and high efficiency: It adopts cylinder drive and can be easily integrated into the production line to realize automated operation, which greatly improves production efficiency.

[0016] 4. Simple structure and low cost: The device has a compact structure, low manufacturing cost, and is easy to maintain.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a pneumatic shaping device for the valve port of a thermostatic expansion valve according to the present invention.

[0019] Figure 2 This is a structural diagram of the valve body of a pneumatic shaping device for the valve port of a thermostatic expansion valve according to this utility model.

[0020] Figure 3 This is a structural diagram of the pneumatic pressure head assembly of a pneumatic shaping device for a thermostatic expansion valve according to this utility model.

[0021] Figure 4 This is a structural diagram of the upper pressure head of a pneumatic shaping device for the valve port of a thermostatic expansion valve according to this utility model.

[0022] Figure 5 This is a structural diagram of the steel ball seat of a pneumatic shaping device for the valve port of a thermostatic expansion valve according to this utility model.

[0023] Figure 6 This is a structural diagram of the positioning plate of a pneumatic shaping device for the valve port of a thermostatic expansion valve according to this utility model; 1-cylinder, 2-pneumatic pressure head assembly, 3-positioning sleeve, 4-valve body, 5-positioning block, 21-upper pressure head, 22-steel ball seat, 23-steel ball, 41-valve port, 51-positioning groove, 21a-internal thread, 22a-external thread Detailed Implementation

[0024] like Figure 1-6 As shown, this utility model discloses a pneumatic shaping device for the valve port of a thermostatic expansion valve, comprising a cylinder 1, a pneumatic pressure head assembly 2, a positioning sleeve 3, a valve body 4, and a positioning block 5. The pneumatic pressure head assembly 2 consists of an upper pressure head 21, a steel ball seat 22, and a steel ball 23. The cylinder 1 drives the pneumatic pressure head assembly 2 to move along a preset linear trajectory to apply a processing force to the valve port 41 of the valve body 4 on the positioning sleeve 3 and the positioning block 5. The end of the pressure head assembly 2 is provided with a steel ball 23 that matches the shape of the valve port. The upper pressure head 21 has an internal thread 21a in its inner hole, and the outer cylinder of the steel ball seat 22 has an external thread 22a. The upper pressure head 21 and the steel ball seat 22 are fixed by a threaded connection. The steel ball seat 22 and the steel ball 23 are connected by energy storage welding. The surface of the steel ball 23 is smooth, with a surface roughness of Ra0.02, and the surface of the steel ball 23 is hardened, with a surface hardness of 56-60 HRC. The positioning block 5 has a positioning groove 51 inside, and the valve body 4 is positioned through the positioning groove 51 in the positioning block 5.

[0025] The shaping process of a pneumatic shaping device for the valve port of a thermostatic expansion valve is as follows:

[0026] Turn on the equipment, install the positioning sleeve 3 and pneumatic component 2 into the valve body 4, and then place the valve body 4 on the positioning block 5. Position it through the positioning groove 51 in the positioning block 5. The cylinder 1 moves downward, driving the pneumatic pressure head assembly 2 to move downward along the positioning sleeve 3, so that the steel ball 23 in the pneumatic pressure head assembly 2 squeezes the valve port 41. Since the pneumatic pressure head assembly 2 is squeezed by the smooth and hard steel ball 23, plastic deformation occurs. The cylinder moves upward, removes the valve body 4, and removes the positioning sleeve 3 and pneumatic component 2 from the valve body 4, completing one shaping.

[0027] 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 pneumatic shaping device for the valve port of a thermostatic expansion valve, comprising a cylinder (1), a pneumatic pressure head assembly (2), a positioning sleeve (3), a valve body (4), and a positioning block (5); characterized in that: The pneumatic pressure head assembly (2) consists of an upper pressure head (21), a steel ball seat (22), and a steel ball (23); the cylinder (1) can drive the pneumatic pressure head assembly (2) to apply processing force along the axial direction of the positioning sleeve (3) through the valve port (41) of the valve body (4) on the positioning block (5); the end of the pressure head assembly (2) is provided with a steel ball (23) that matches the shape of the valve port.

2. The pneumatic shaping device for the valve port of a thermostatic expansion valve according to claim 1, characterized in that: The upper pressure head (21) has an internal thread (21a) in its inner hole, and the outer cylinder of the steel ball seat (22) has an external thread (22a); the upper pressure head (21) and the steel ball seat (22) are fixed by threaded connection.

3. The pneumatic shaping device for the valve port of a thermostatic expansion valve according to claim 1, characterized in that: The steel ball seat (22) and the steel ball (23) are connected by energy storage welding.

4. The pneumatic shaping device for the valve port of a thermostatic expansion valve according to claim 1, characterized in that: The surface of the steel ball (23) is smooth with a surface roughness of Ra0.

02. The surface of the steel ball (23) has been hardened and has a surface hardness of 56 to 60 HRC.

5. The pneumatic shaping device for the valve port of a thermostatic expansion valve according to claim 1, characterized in that: The positioning block (5) has a positioning groove (51) inside, and the valve body (4) is positioned through the positioning groove (51) in the positioning block (5).

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