Electronic expansion valve seat half assembly

Abstract

The utility model relates to the technical field of electronic expansion valves, in particular to a valve seat semi-assembly of an electronic expansion valve, which is characterized in that a valve body is arranged at a specified position, a medium flows through the valve body, then power is transmitted through a transmission mechanism, a valve needle moves upwards or downwards, and the flow in the valve body is adjusted, so that the practicability of equipment is improved; comprising a valve needle; the valve further comprises a transmission mechanism and a valve body, and the transmission mechanism and the valve needle are both installed in the valve body. The transmission mechanism transmits power, the valve body guides the valve needle, and the valve needle controls the flow in the valve body.

Description

Technical Field

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

[0002] An electronic expansion valve is a device used to control the flow of refrigerant, usually used in refrigeration and air-conditioning systems. The electronic expansion valve is superior to traditional throttling mechanisms in terms of superheat control (liquid level control) and flow regulation, and has a faster response speed, a wider adjustment range, and a more significant energy-saving effect, with broad application prospects.

[0003] Existing electronic expansion valves, such as those disclosed in the utility model patent with the publication number CN215891132U and the invention patent with the publication number CN113446405A, etc., can all achieve flow regulation.

[0004] However, the existing electronic expansion valves are inconvenient to assemble during production, inconvenient to adjust flexibly and stably during use, and there is a large pressure difference on both sides of the valve port of the electronic expansion valve. The pressure difference acts on the valve needle of the electronic expansion valve, increasing the operating resistance of the valve needle. When the electronic expansion valve needs to be opened again after being closed, the valve needle needs to overcome a large pressure difference resistance to open the refrigerant channel, and the valve needle is not easy to open. If a motor with a larger torque is used to overcome the resistance, the volume of the electronic expansion valve coil will increase relatively, the control accuracy will decrease, the installation is restricted by space, the system power consumption is large, and the cost increases, resulting in poor practicability. Therefore, there is an urgent need for a semi-assembly of an electronic expansion valve seat to improve the above problems. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides a semi-assembly of an electronic expansion valve seat, which installs the valve body at a specified position, allows the medium to flow through the valve body, and then transmits the power through the transmission mechanism to move the valve needle up or down to adjust the flow rate in the valve body, thereby improving the practicability of the device.

[0006] The semi-assembly of an electronic expansion valve of the utility model includes a valve needle; it also includes a transmission mechanism and a valve body, and both the transmission mechanism and the valve needle are installed in the valve body;

[0007] The transmission mechanism transmits the power, the valve body guides the valve needle, and the valve needle controls the flow rate in the valve body;

[0008] Install the valve body at a specified position, allow the medium to flow through the valve body, and then transmit the power through the transmission mechanism to move the valve needle up or down to adjust the flow rate of the valve port, thereby improving the practicability of the device.

[0009] Preferably, the valve body includes a valve seat, a valve base, and a nut assembly. The top of the valve base is press-fitted into the bottom of the valve seat, and they are welded between the valve seat and the valve base. A second step is provided at the connection between the valve seat and the valve base. An inner hole is provided inside the valve base, and a valve port is provided at the bottom of the valve base. The nut assembly is press-fitted into the top of the valve seat, and the nut assembly and the valve seat are clinched. The medium flows through the valve port of the valve base, and the transmission mechanism is guided through the nut assembly to improve the stability of the valve needle. The valve needle is guided through the inner holes of the valve seat and the valve base, and the valve needle controls the flow rate of the valve port, thereby improving the stability and accuracy of the flow rate adjustment inside the valve base.

[0010] Preferably, multiple groups of grooves are provided at the top inside the valve seat, and protrusions are provided at the bottom of the nut assembly. When the bottom of the nut assembly is inserted into the top of the valve seat, the protrusions on the nut assembly are stuck in the grooves inside the valve seat to prevent the nut assembly from rotating and failing, thereby improving the stability of the electronic expansion valve and reducing the failure rate of the electronic expansion valve.

[0011] Preferably, the transmission mechanism includes a screw, a valve needle sleeve, a bushing, and a valve needle spring. A first step is provided on the inner wall of the valve needle. The valve needle sleeve is sleeved on the valve needle. The bushing is press-fitted on the bottom of the screw, and the bushing and the screw are welded. The surface of the valve needle sleeve is welded to the outer wall of the valve needle. The valve needle spring is installed inside the valve needle, and the bottom end of the valve needle spring contacts the first step on the inner wall of the valve needle, and the top end of the valve needle spring contacts the bushing. The top of the screw passes through the nut assembly, and the surface of the screw is threadedly connected to the inner wall of the nut assembly. By driving the screw to rotate, through the threaded transmission between the screw and the nut assembly, the valve needle moves downward or upward. When the valve needle moves downward or upward, the decoupling structure composed of the screw, the valve needle sleeve, the bushing, and the valve needle improves the flexibility of the valve needle.

[0012] Preferably, a first through hole is provided inside the valve needle, and a second through hole is provided at the top of the valve needle, and the second through hole is communicated with the inside of the first through hole. Through the first through hole and the second through hole, when the valve needle is opened, the pressure at the valve inlet can be quickly balanced with the pressure inside the valve, thereby improving the practicability of the valve needle.

[0013] Preferably, a spring guide rail and a slip ring are provided on the nut assembly. The slip ring is toggled by the stop rod on the magnetic rotor, and the slip ring is guided through the spring guide rail to make the slip ring spiral up or spiral down. Then, the slip ring rising to the top of the nut assembly is limited by the top of the spring guide rail, or the slip ring descending to the bottom of the nut assembly is limited by the bottom of the nut assembly, thereby restricting the lifting stroke of the valve needle and improving the stability of the valve needle closing and opening.

[0014] Preferably, a second step is provided on the valve needle, and an auxiliary spring is sleeved on the valve needle. The bottom of the auxiliary spring contacts the top of the second step, and the top of the auxiliary spring contacts the inner wall of the nut assembly. When the valve needle is closed, the elastic force of the auxiliary spring is increased to press the valve needle downward, which can reduce the sealing force required when the valve needle is closed, thereby achieving the purpose of cost reduction.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. Each component of the screw, valve needle, valve seat and valve base has a simple structure, is easy to process, and has a low processing cost;

[0017] 2. Both the valve needle and the nut assembly are provided with through holes, and when the valve needle is opened, the pressure at the valve inlet can be quickly balanced with the pressure inside the valve;

[0018] 3. Through the cooperation of the convex block on the nut assembly and the limit groove on the valve seat, it is prevented that the nut assembly rotates when the screw rotates, improving the stability of the electronic expansion valve;

[0019] 4. The nut assembly is matched with the valve seat by a permanent fit method, improving the structural stability;

[0020] 5. The structure has a high integration degree, is more convenient to assemble, is beneficial to light weight and cost reduction;

[0021] 6. The sliding ring is guided by the spring guide rail, so that the sliding ring spirally rises or falls on the shaft tube, restricting the lifting range of the flow control mechanism and improving the stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the first axonometric structural schematic diagram of the present utility model;

[0023] Figure 2 is the second axonometric structural schematic diagram of the present utility model;

[0024] Figure 3 is the exploded structural schematic diagram of the present utility model;

[0025] Figure 4 is the front view sectional structural schematic diagram of the mechanisms such as the valve seat, valve base and nut assembly of the present utility model;

[0026] Figure 5 is the front view sectional structural schematic diagram of the mechanisms such as the screw and valve needle of the present utility model;

[0027] Figure 6 is the axonometric enlarged structural schematic diagram of the nut assembly, spring guide rail and sliding ring of the present utility model.

[0028] Reference numerals in the drawings: 1, valve seat; 2, valve base; 3, nut assembly; 4, protrusion; 5, screw; 6, valve needle sleeve; 7, bushing; 8, valve needle spring; 9, spring guide; 10, slip ring; 11, second step; 12, auxiliary spring; 31, valve needle. Detailed implementation mode

[0029] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0030] Embodiment 1

[0031] A valve seat semi-assembly of an electronic expansion valve includes a valve needle 31; it also includes a transmission mechanism and a valve body, and both the transmission mechanism and the valve needle 31 are installed in the valve body;

[0032] The transmission mechanism transmits power, the valve body guides the valve needle 31, and the valve needle 31 controls the flow rate in the valve body;

[0033] The valve body includes a valve seat 1, a valve base 2 and a nut assembly 3. The top of the valve base 2 is press-fitted into the bottom of the valve seat 1, and the valve seat 1 and the valve base 2 are welded. A second step is provided at the connection between the valve seat 1 and the valve base 2. A valve port is provided at the bottom of the valve base 2. The nut assembly 3 is press-fitted into the top of the valve seat 1, and the nut assembly 3 and the valve seat 1 are clinched;

[0034] Multiple groups of grooves are provided at the top inside the valve seat 1, and a protrusion 4 is provided at the bottom of the nut assembly 3;

[0035] The transmission mechanism includes a screw 5, a valve needle sleeve 6, a bushing 7 and a valve needle spring 8. A first step is provided on the inner wall of the valve needle 31. The valve needle sleeve 6 is sleeved on the valve needle 6. The bushing 7 is press-fitted on the bottom of the screw 5, and the bushing 7 and the screw 5 are welded. The surface of the valve needle sleeve 6 is welded to the outer wall of the valve needle 31. The valve needle spring 8 is installed inside the valve needle 31, and the bottom end of the valve needle spring 8 contacts the first step on the inner wall of the valve needle 31, and the top end of the valve needle spring 8 contacts the bushing 7. The top of the screw 5 passes through the nut assembly 3, and the surface of the screw 5 is threadedly connected to the inner wall of the nut assembly 3;

[0036] A first through hole is provided inside the valve needle 31, and a second through hole is provided at the top of the valve needle 31, and the second through hole is communicated with the inside of the first through hole;

[0037] A spring guide 9 and a slip ring 10 are provided on the nut assembly 3;

[0038] The medium flows through the valve port of the valve base 2, and the medium is driven to rotate by the screw rod 5, and is threadedly transmitted by the screw rod 5 and the nut assembly 3, and the valve needle 31 is guided by the valve seat 1 and the valve base 2, so that the valve needle 31 adjusts the flow in the valve base 2, and in the process of adjusting the flow, the air pressure in the valve base 2 is adjusted through the first through hole and the second through hole, and in the process of rising or falling of the valve needle 31, the slip ring 10 is moved by the stop rod on the magnetic rotor (such as the electronic expansion valve disclosed in the authorized utility model patent with publication number CN217502605U), and the slip ring 10 is guided by the spring guide rail 9, so that the slip ring 10 spirally rises or spirally falls, and then the slip ring 10 rising to the top of the nut assembly 3 is limited by the top of the spring guide rail 9, or the slip ring 10 falling to the bottom of the nut assembly 3 is limited by the bottom of the nut assembly 3, so as to limit the lifting range of the valve needle 31, thereby improving the practicality of the equipment.

[0039] Example 2

[0040] like Figures 1 to 6 As shown, an electronic expansion valve seat semi-assembly includes a valve needle 31; a transmission mechanism and a valve body, and the transmission mechanism and the valve needle 31 are both installed in the valve body;

[0041] The transmission mechanism transmits power, the valve body guides the valve needle 31, and the valve needle 31 controls the flow in the valve body;

[0042] The valve body comprises a valve seat 1, a valve base 2 and a nut assembly 3, the top of the valve base 2 is inserted into the bottom of the valve seat 1 by interference, and the valve seat 1 and the valve base 2 are welded, a second step is provided at the connection between the valve seat 1 and the valve base 2, a valve port is provided at the bottom of the valve base 2, the nut assembly 3 is inserted into the top of the valve seat 1 by interference, and the nut assembly 3 and the valve seat 1 are connected by riveting;

[0043] The top of the valve seat 1 is provided with multiple groups of grooves, and the bottom of the nut assembly 3 is provided with a protrusion 4;

[0044] The transmission mechanism includes a screw rod 5, a valve needle sleeve 6, a bushing 7 and a valve needle spring 8. A first step is provided on the inner wall of the valve needle 31. The valve needle sleeve 6 is sleeved on the valve needle sleeve 6. The bushing 7 is interference sleeved on the bottom of the screw rod 5, and the bushing 7 is welded to the screw rod 5. The surface of the valve needle sleeve 6 is welded to the outer wall of the valve needle 31. The valve needle spring 8 is installed inside the valve needle 31, and the bottom end of the valve needle spring 8 contacts the first step of the inner wall of the valve needle 31, and the top end of the valve needle spring 8 contacts the bushing 7. The top of the screw rod 5 passes through the nut assembly 3, and the surface of the screw rod 5 is threadedly connected to the inner wall of the nut assembly 3.

[0045] The valve needle 31 is provided with a first through hole inside, and a second through hole is provided on the top of the valve needle 31, and the second through hole is communicated with the inside of the first through hole;

[0046] The nut assembly 3 is provided with a spring guide rail 9 and a slip ring 10;

[0047] The valve needle 31 is provided with a second step 11, and an auxiliary spring 12 is sleeved on the valve needle 31, and the bottom of the auxiliary spring 12 contacts the top of the second step 11, and the top of the auxiliary spring 12 contacts the inner wall of the nut assembly 3;

[0048] The medium flows through the valve port of the valve base 2, and the medium is driven to rotate by the screw rod 5, and is threadedly transmitted by the screw rod 5 and the nut assembly 3, and the valve needle 31 is guided by the valve seat 1 and the valve base 2, so that the valve needle 31 adjusts the flow in the valve base 2, and in the process of adjusting the flow, the air pressure in the valve base 2 is adjusted through the first through hole and the second through hole, and in the process of rising or falling of the valve needle 31, the slip ring 10 is moved by the stop rod on the magnetic rotor, and the slip ring 10 is guided by the spring guide rail 9, so that the slip ring 10 spirally rises or spirally falls, and then the slip ring 10 rising to the top of the nut assembly 3 is limited by the top of the spring guide rail 9, or the slip ring 10 falling to the bottom of the nut assembly 3 is limited by the bottom of the nut assembly 3, so as to limit the lifting range of the valve needle 31, and when the valve needle 31 blocks the inside of the valve base 2, the second step 11 is pressed downward by the elasticity of the valve needle spring 8 and the auxiliary spring 12, so that the second step 11 seals the gap between the valve seat 1 and the valve needle 31, thereby improving the practicality of the equipment.

[0049] The auxiliary spring 12 and the valve needle 31 of the electronic expansion valve seat semi-assembly of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual without the need for creative work by technicians in this field.

[0050] 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. An electronic expansion valve seat half assembly, comprising a valve needle (31); characterized in that: It also includes a transmission mechanism and a valve body, wherein the transmission mechanism and the valve needle (31) are both installed in the valve body; The transmission mechanism transmits power, the valve body guides the valve needle (31), and the valve needle (31) controls the flow rate in the valve body; A first through hole is provided inside the valve needle (31), a second through hole is provided on the top of the valve needle (31), and the second through hole is communicated with the inside of the first through hole; The valve needle (31) is provided with a second step (11), and an auxiliary spring (12) is sleeved on the valve needle (31), wherein the bottom of the auxiliary spring (12) contacts the top of the second step (11), and the top of the auxiliary spring (12) contacts the inner wall of the nut assembly (3).

2. The electronic expansion valve seat half assembly according to claim 1, characterized in that: The valve body comprises a valve seat (1), a valve base (2) and a nut assembly (3); the top of the valve base (2) is inserted into the bottom of the valve seat (1) by interference fit, and the valve seat (1) and the valve base (2) are welded; a second step is provided at the connection between the valve seat (1) and the valve base (2); a valve port is provided at the bottom of the valve base (2); the nut assembly (3) is inserted into the top of the valve seat (1) by interference fit, and the nut assembly (3) and the valve seat (1) are connected by riveting.

3. The electronic expansion valve seat half assembly according to claim 2, characterized in that: The top of the valve seat (1) is provided with a plurality of groups of grooves, and the bottom of the nut assembly (3) is provided with a protrusion (4).

4. The electronic expansion valve seat half assembly according to claim 2, characterized in that: The transmission mechanism comprises a screw rod (5), a valve needle sleeve (6), a bushing (7) and a valve needle spring (8); a first step is provided on the inner wall of the valve needle (31); the valve needle sleeve (6) is sleeved on the valve needle sleeve (6); the bushing (7) is interference sleeved on the bottom of the screw rod (5); the bushing (7) and the screw rod (5) are welded; the surface of the valve needle sleeve (6) is welded to the outer wall of the valve needle (31); the valve needle spring (8) is installed inside the valve needle (31); the bottom end of the valve needle spring (8) contacts the first step of the inner wall of the valve needle (31); the top end of the valve needle spring (8) contacts the bushing (7); the top of the screw rod (5) passes through the nut assembly (3); and the surface of the screw rod (5) is threadedly connected to the inner wall of the nut assembly (3).

5. The electronic expansion valve seat half assembly according to claim 2, characterized in that: The nut assembly (3) is provided with a spring guide rail (9) and a slip ring (10).

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