A low-cost electronic expansion valve

Abstract

The utility model relates to the technical field of electronic expansion valves, and in particular to a low-cost electronic expansion valve, which reduces the overall processing amount of a valve needle, shortens the processing time, reduces the cost of parts, has fewer assembly processes, has good coaxiality, and has good durability; it comprises a screw, a valve needle guide section, a valve needle, a valve seat, and a bolt, the valve seat being mounted at the bottom of a valve body, the valve needle guide section being mounted on an inner wall of the valve seat, the lower part of the screw extending into the interior of the valve needle guide section, the valve needle being mounted at the bottom end of the valve needle guide section, and a spring being arranged in the valve needle guide section, the upper part of the spring being sleeved on the outer wall of the bottom of the screw, the lower part of the spring being sleeved on the outer wall of the top of the valve needle, the bolt being threadedly mounted on the outer wall of the valve seat, the bolt being used to fix the valve seat on the valve body, the base being connected and arranged at the bottom end of the valve seat, and the valve seat and the base being integrally cold headed.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to a low-cost electronic expansion valve. Background Art

[0002] With the expansion of the new energy market, industry competition has become more intense, and low-cost, high-performance products are highly competitive, and the same is true for electronic expansion valves.

[0003] However, the traditional electronic expansion valve is limited in its widespread application in refrigeration systems due to its complex structure, high cost, and limited control accuracy.

[0004] In this context, in response to this phenomenon, an electronic expansion valve with lower cost and better durability is proposed to achieve efficient, energy-saving and environmentally friendly operation of the refrigeration system. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a low-cost electronic expansion valve which reduces the overall processing amount of the valve needle, shortens the processing time, reduces the cost of parts, has fewer assembly steps, has good coaxiality, and has good durability.

[0006] The utility model discloses a low-cost electronic expansion valve, comprising a screw, a valve needle guide section, a valve needle, a valve seat and a bolt, the valve seat is mounted on the bottom of the valve body, the valve needle guide section is mounted on the inner side wall of the valve seat, the lower part of the screw extends into the inside of the valve needle guide section, the valve needle is mounted on the bottom end of the valve needle guide section, and a spring is arranged in the valve needle guide section, the upper part of the spring is sleeved on the outer side wall of the bottom of the screw, the lower part of the spring is sleeved on the outer side wall of the top of the valve needle, the bolt is threadedly mounted on the outer side wall of the valve seat, the bolt is used to fix the valve seat on the valve body, the base is connected and arranged at the bottom end of the valve seat, and the valve seat and the base are integrally cold-forged; during the assembly process, the screw is passed through the inside of the valve needle guide section from bottom to top, and since the shape of the top of the screw is larger than the top opening of the valve needle guide section, the valve The needle guide section limits the bottom of the screw, and then the spring is installed inside the valve needle guide section, and the top of the spring supports the bottom of the screw, and then the valve needle is installed at the bottom opening of the valve needle guide section, the base is installed at the bottom of the valve seat, and the valve needle guide section is installed inside the valve seat. The valve needle guide section is stamped and then assembled with the valve needle, which reduces the overall processing amount of the valve needle, shortens the processing time, reduces the part cost, reduces the machining cutting amount, reduces tool wear, and reduces the part cost. The valve seat and the base are cold-forged as a whole and then machined to reduce the part cost. The valve needle guide section is stamped and then assembled with the valve needle to reduce the part cost. The structure has a high degree of integration, fewer parts, fewer assembly steps, good coaxiality, good durability, and cost advantages.

[0007] Preferably, it also includes a support surface, which is arranged at the bottom end of the screw rod; the bottom end of the screw rod is processed into a shape of the support surface to support the spring, which is convenient for centering the spring during installation and improves the durability of the spring.

[0008] Preferably, it also includes a protrusion, which is arranged on the upper part of the inner wall of the valve needle guide section; during the processing of the valve needle guide section, the shape of the protrusion is first punched out from the top of the valve needle guide section and then bent. When the screw and the valve needle guide section are assembled, a decoupling structure is formed by the protrusion and the bottom of the screw, ensuring that the line contact position between the screw and the valve needle guide section is close to the inner side of the lower end and reducing abrasions caused by assembly.

[0009] Preferably, it also includes a step, which is arranged at the lower part of the outer wall of the valve needle guide section; by making the lower part of the outer wall of the valve needle guide section into a step shape, the deformation of the valve needle guide section after assembly, which causes the valve needle guide section to become larger in size and interfere with the base, is reduced.

[0010] Preferably, the outer side wall of the bottom of the screw is treated with PTFE coating to increase the wear resistance of the screw and improve its durability.

[0011] Preferably, the external thread on the surface of the screw is processed by rough turning first and then thread rolling; generally, the surface roughness of the thread after thread rolling is better than that of the machined thread, and the surface is hardened due to cold working, the strength and hardness of the part are better than those of the machined thread, the material utilization rate of thread rolling is higher, which reduces the processing material cost in disguise, the production efficiency of thread rolling is higher than that of the machined thread, the life of the thread rolling tool is also higher than that of the machined tool, and the production cost is lower, but generally, thread rolling has a certain influence on the coaxiality of the parts at the front and rear ends of the thread rolling position, and because of the existence of internal stress, the life of the screw thread will be affected, so the method of first rough turning and then thread rolling is adopted to reduce the material deformation during rolling, reduce the generation of internal stress and material deformation, and improve the coaxiality of the front and rear ends of the screw and the life of the screw thread.

[0012] Preferably, during the processing and forming of the valve needle, the valve needle is processed after cold drawing to increase the hardness of the material and improve the durability of the product.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: during the assembly process, the screw is passed through the valve needle guide section from bottom to top. Since the shape of the top of the screw is larger than the top opening of the valve needle guide section, the valve needle guide section limits the bottom of the screw, and then the spring is installed in the valve needle guide section, and the top of the spring supports the bottom of the screw, and then the valve needle is installed at the bottom opening of the valve needle guide section, the base is installed at the bottom end of the valve seat, and the valve needle guide section is installed in the valve seat. The valve needle guide section is stamped and formed and then assembled with the valve needle, which reduces the overall processing amount of the valve needle, shortens the processing time, reduces the cost of parts, reduces the amount of machining cutting, reduces tool wear, and reduces the cost of parts. The valve seat and the base are cold-forged as a whole and then machined to reduce the cost of parts. The valve needle guide section is stamped and formed and then assembled with the valve needle, which reduces the cost of parts. The structure has high integration, fewer parts, fewer assembly steps, good coaxiality, good durability, and cost advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the axonometric structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the axonometric partial structure of the connection between the valve seat and the base;

[0016] Figure 3 It is a schematic diagram of the axonometric partial structure of the connection between the screw and the external thread;

[0017] Figure 4 It is a schematic diagram of the axonometric partial structure of the connection between the screw and the supporting surface;

[0018] Figure 5 It is a schematic diagram of the partial isometric structure of the connection between the valve needle guide section and the valve needle;

[0019] Figure 6 It is a schematic diagram of the isometric partial structure of the connection between the valve needle guide section and the protrusion, etc.;

[0020] Figure 7 It is a schematic diagram of the partial isometric structure of the connection between the valve needle guide section and the step, etc.;

[0021] Figure 8 It is a schematic diagram of the axonometric partial structure of the connection between the screw and the supporting surface;

[0022] Fig. 9 It is a schematic diagram of the axonometric partial structure of the connection between the valve needle guide section and the valve needle.

[0023] Markings in the attached drawings: 1. screw; 2. valve needle guide section; 3. valve needle; 4. valve seat; 5. bolt; 6. base; 7. supporting surface; 8. protrusion; 9. step. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0025] Example 1

[0026] like Figures 1 to 9 As shown, a low-cost electronic expansion valve of the utility model comprises a screw 1, a valve needle guide section 2, a valve needle 3, a valve seat 4 and a bolt 5, the valve seat 4 is mounted at the bottom of the valve body, the valve needle guide section 2 is mounted on the inner wall of the valve seat 4, the lower part of the screw 1 extends into the valve needle guide section 2, the valve needle 3 is mounted at the bottom end of the valve needle guide section 2, and a spring is arranged in the valve needle guide section 2, the upper part of the spring is sleeved on the outer wall of the bottom of the screw 1, and the lower part of the spring is sleeved on the outer wall of the top of the valve needle 3, the bolt 5 is threadedly mounted on the outer wall of the valve seat 4, the bolt 5 is used to fix the valve seat 4 on the valve body, the base 6 is arranged at the bottom end of the valve seat 4 in communication, and the valve seat 4 and the base 6 are integrally cold headed;

[0027] like Figure 4 As shown, it also includes a support surface 7, which is arranged at the bottom end of the screw rod 1;

[0028] In this embodiment, during the assembly process, the screw 1 is passed through the inside of the valve needle guide section 2 from bottom to top. Since the shape of the top of the screw 1 is larger than the top opening of the valve needle guide section 2, the valve needle guide section 2 limits the bottom of the screw 1. Then the spring is installed in the inside of the valve needle guide section 2, and the top of the spring supports the bottom of the screw 1. Then the valve needle 3 is installed at the bottom opening of the valve needle guide section 2, the base 6 is installed at the bottom of the valve seat 4, and the valve needle guide section 2 is installed in the inside of the valve seat 4. The valve needle guide section 2 is stamped and then assembled with the valve needle 3, which reduces the overall processing amount of the valve needle, shortens the processing time, reduces the part cost, reduces the machining cutting amount, reduces tool wear, and reduces the part cost. The valve seat 4 and the base 6 are cold-forged as a whole and then machined to reduce the part cost. The valve needle guide section 2 is stamped and then assembled with the valve needle 3 to reduce the part cost. The structure has high integration, fewer parts, fewer assembly steps, good coaxiality, good durability, and cost advantages.

[0029] Example 2

[0030] On the basis of Example 1, Figure 6 As shown, it also includes a protrusion 8, which is arranged on the upper part of the inner wall of the valve needle guide section 2;

[0031] like Figure 7 As shown, it also includes a step 9, which is arranged at the lower part of the outer side wall of the valve needle guide section 2;

[0032] like Figure 4 As shown, the outer side wall of the bottom of the screw 1 is treated with PTFE coating;

[0033] like Figure 3 As shown, the external thread on the surface of the screw rod 1 is processed by first rough turning and then rolling.

[0034] like Figure 5 As shown, the valve needle 3 is processed and formed, and then processed after cold drawing;

[0035] In this embodiment, a support surface 7 is processed at the bottom end of the screw 1 to support the spring, which is convenient for centering the spring during installation and improves the durability of the spring. During the processing of the valve needle guide segment 2, the shape of the protrusion 8 is first punched out from the top of the valve needle guide segment 2 and then bent. When the screw 1 and the valve needle guide segment 2 are assembled, a decoupling structure is formed with the bottom of the screw 1 through the protrusion 8, ensuring that the line contact position between the screw 1 and the valve needle guide segment 2 is close to the inner side of the lower end and reducing abrasions caused by assembly.

[0036] The utility model discloses a low-cost electronic expansion valve. When the utility model is working, during the assembly process, the screw rod 1 is passed through the inside of the valve needle guide section 2 from bottom to top. Since the top shape of the screw rod 1 is larger than the top opening of the valve needle guide section 2, the valve needle guide section 2 limits the bottom of the screw rod 1. Then, the spring is installed inside the valve needle guide section 2, and the top of the spring supports the bottom of the screw rod 1. Then, the valve needle 3 is installed at the bottom opening of the valve needle guide section 2, the base 6 is installed at the bottom end of the valve seat 4, and the valve needle guide section 2 is installed inside the valve seat 4.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A low-cost electronic expansion valve, characterized in that: The invention comprises a screw rod (1), a valve needle guide section (2), a valve needle (3), a valve seat (4) and a bolt (5), wherein the valve seat (4) is mounted at the bottom of the valve body, the valve needle guide section (2) is mounted on the inner wall of the valve seat (4), the lower part of the screw rod (1) extends into the interior of the valve needle guide section (2), the valve needle (3) is mounted at the bottom end of the valve needle guide section (2), and a spring is arranged in the valve needle guide section (2), the upper part of the spring is sleeved on the outer wall of the bottom of the screw rod (1), and the lower part of the spring is sleeved on the outer wall of the top of the valve needle (3), the bolt (5) is threadedly mounted on the outer wall of the valve seat (4), the bolt (5) is used to fix the valve seat (4) on the valve body, the base (6) is arranged at the bottom end of the valve seat (4), and the valve seat (4) and the base (6) are integrally cold headed.

2. A low-cost electronic expansion valve as claimed in claim 1, characterized in that: It also includes a supporting surface (7), which is arranged at the bottom end of the screw rod (1).

3. A low-cost electronic expansion valve as claimed in claim 1, characterized in that: It also comprises a protrusion (8), which is arranged on the upper part of the inner wall of the valve needle guide section (2).

4. A low-cost electronic expansion valve as claimed in claim 1, characterized in that: It also comprises a step (9), which is arranged at the lower part of the outer side wall of the valve needle guide section (2).

5. A low-cost electronic expansion valve as claimed in claim 1, characterized in that: The outer side wall of the bottom of the screw (1) is treated with PTFE coating.

6. A low-cost electronic expansion valve as claimed in claim 1, characterized in that: The external threads on the surface of the screw (1) are processed by first rough turning and then rolling.

7. A low-cost electronic expansion valve as claimed in claim 1, characterized in that: During the processing and forming of the valve needle (3), the valve needle (3) is processed after cold drawing.

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