Valve needle and screw flexible connection structure applied to electronic expansion valve

Abstract

The utility model discloses a valve needle and screw flexible connection structure applied to an electronic expansion valve, which comprises a valve seat, the top of the valve seat is fixedly connected with a nut, a screw is arranged in the nut in a matching and penetrating manner, the top end of the nut is fixedly sleeved with a rotor, the nut is positioned in the rotor, the bottom end of the valve seat is fixedly provided with a valve port protective cover in a penetrating manner, and the valve port protective cover is fixedly connected with the valve seat. A conical valve port is fixedly installed in an opening in the bottom end of the valve port protective cover, a medium flow through hole is formed in the peripheral wall of the valve port protective cover, a valve needle is slidably connected into the valve port protective cover in a sealed mode, and a blind hole is formed in the top end of the valve needle. The ball valve is simple in structure, easy to machine and low in production cost, the screw is in linear contact with the spring due to the fact that the bottom end of the screw is spherical, the screw can be effectively prevented from driving the spring to rotate, friction force between the screw and the shaft sleeve is small, the shaft sleeve cannot be driven to rotate, the screw is effectively prevented from driving the valve needle to rotate, and service life of the valve needle is prolonged. The use stability of the expansion valve is ensured, and the use effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to a valve needle and screw rod soft connection structure applied to electronic expansion valves. Background Art

[0002] As a new type of control element, the electronic expansion valve has become an important part of the intelligent refrigeration system and an important means and guarantee for the real optimization of the refrigeration system. At present, the electronic expansion valve combined with the compressor variable capacity technology has been more and more widely used; the electric electronic expansion valve relies on a stepper motor to drive the needle valve, which is divided into direct-acting type and reduction type. Among them, the direct-acting electronic expansion valve uses a pulse stepper motor to directly drive the valve needle movement. When the pulse voltage of the control circuit acts on the phase coils of the motor stator according to a certain logical relationship, the motor rotor made of permanent magnets is subjected to the magnetic torque to produce rotational motion, and the valve needle is raised or lowered through the transmission of the thread, thereby adjusting the flow of the valve.

[0003] At present, the screw of most direct-acting electronic expansion valves is softly connected to the valve needle through a transition structure. For example, the electronic expansion valve disclosed in the patent with announcement number CN217736284U improves the stability of the valve needle during movement by setting a transition structure composed of a rotating part, a guide sleeve, an elastic part, a shaft sleeve and a limit sleeve. The setting of the shaft sleeve and the rotating part can prevent the rotational motion of the screw from being transmitted to the valve needle through the elastic part, thereby preventing the valve needle from rotating with the screw, so as to ensure the stability of the expansion valve. However, this type of transition structure is too complicated, which greatly increases the production difficulty and manufacturing cost of the expansion valve and needs to be improved. Utility Model Content

[0004] The purpose of the present utility model is to provide a valve needle and screw flexible connection structure applied to an electronic expansion valve, so as to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A valve needle and screw soft connection structure applied to an electronic expansion valve, comprising a valve seat, a nut fixedly connected to the top of the valve seat, a screw fitted inside the nut, a rotor fixedly sleeved on the top of the nut, the nut being located inside the rotor, a valve port shield fixedly penetrated at the bottom end of the valve seat, a conical valve port fixedly installed in the bottom opening of the valve port shield, a medium flow hole provided on the outer peripheral wall of the valve port shield, a valve needle slidably and sealingly connected in the valve port shield, a blind hole provided on the top end of the valve needle, the bottom end of the screw penetrates into the blind hole, a spring is provided in the blind hole, the bottom end of the screw is spherical, and the top end of the spring is against the spherical surface, a shaft sleeve movably sleeved on the outer wall of the screw, and the shaft sleeve is fixedly installed at the opening of the blind hole.

[0007] As a further solution of the present invention: the top opening of the tapered valve port is tapered, the bottom end of the valve needle is tapered, and the outer wall of the bottom end of the valve needle fits with the top opening of the tapered valve port.

[0008] As a further solution of the present invention: the outer wall of the nut is sleeved with a spring guide rail and a stopper.

[0009] As a further solution of the present invention: a sleeve is welded and fixed to the top end of the valve seat, and the rotor is located in the sleeve.

[0010] As a further solution of the present invention: the valve seat and the valve port shield are fixed by welding.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The utility model has a simple structure, is easy to process, and has a low production cost. Moreover, since the bottom end of the screw is spherical, the screw and the spring are in linear contact, which can effectively prevent the screw from driving the spring to rotate. The friction between the screw and the sleeve is small, and the sleeve will not be driven to rotate, thereby effectively preventing the screw from driving the valve needle to rotate, ensuring the stability of the expansion valve and good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a valve needle and screw soft connection structure used in an electronic expansion valve.

[0014] Among them, there are a sleeve 1, a rotor 2, a screw 3, a nut 4, a spring guide 5, a stopper 6, a sleeve 7, a spring 8, a valve seat 9, a valve needle 10, a medium flow hole 11, and a tapered valve port 12. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] See also Figure 1In the embodiment of the present invention, a valve needle and screw soft connection structure for an electronic expansion valve includes a valve seat 9, a nut 4 is fixedly connected to the top of the valve seat 9, a screw 3 is fitted inside the nut 4, a rotor 2 is fixedly sleeved on the top of the nut 4, the nut 4 is located inside the rotor 2, a valve port shield is fitted on the bottom end of the valve seat 9, and the valve seat and the valve port shield are welded and fixed, a conical valve port 12 is fixedly installed in the bottom end opening of the valve port shield, a medium flow hole 11 is provided on the outer peripheral wall of the valve port shield, and the valve port shield can be opened. The sliding seal is connected with a valve needle 10, the top of the valve needle 10 is provided with a blind hole, the bottom end of the screw 3 is inserted into the blind hole, a spring 8 is provided in the blind hole, the bottom end of the screw 3 is spherical, and the top end of the spring 8 is against the spherical surface, the outer wall of the screw 3 is movably sleeved with a sleeve 7, and the sleeve 7 is made of a material with good self-lubricating properties such as polytetrafluoroethylene. The sleeve 7 is fixed at the opening of the blind hole by an interference fit, and a sleeve 1 is welded and fixed to the top of the valve seat 9, and the rotor 2 is located in the sleeve 1.

[0017] The utility model adopts the above-mentioned scheme. When the rotor 2 is driven by the external stator, it drives the screw 3 to rotate relative to the nut 4, thereby utilizing the cooperation between the screw 3 and the nut 4 to drive the screw 3 to move up and down, and utilizing the sleeve 7 and the spring 8 to transmit the up and down movement of the screw 3 to the valve needle 10, so as to adjust the opening of the expansion valve. Since the bottom end of the screw 3 is spherical, the screw 3 and the spring 8 are in line contact, which can effectively prevent the screw 3 from driving the spring 8 to rotate, and the friction between the screw 3 and the sleeve 7 is small, so it will not drive the sleeve 7 to rotate, thereby effectively preventing the screw 3 from driving the valve needle 10 to rotate, and the use effect is good.

[0018] Specific combination Figure 1 In one embodiment of the present invention, the top opening of the conical valve port 12 is conical, the bottom end of the valve needle 10 is conical, and the outer wall of the bottom end of the valve needle 10 fits with the top opening of the conical valve port 12 to improve the tightness of the valve needle 10 and the conical valve port 12.

[0019] Specific combination Figure 1 In some preferred embodiments of the present invention, the outer wall of the nut 4 is provided with a spring guide rail 5 and a stopper 6.

[0020] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flexible connection structure between a valve needle and a screw applied to an electronic expansion valve, characterized by: The valve seat (9) comprises a valve seat (9), the top of which is fixedly connected with a nut (4), a screw (3) is fitted inside the nut (4), a rotor (2) is fixedly sleeved on the top of the nut (4), and the nut (4) is located inside the rotor (2). A valve port shield is fixedly fitted on the bottom end of the valve port shield, a conical valve port (12) is fixedly installed in the bottom opening of the valve port shield, a medium flow hole (11) is provided on the outer peripheral wall of the valve port shield, a valve needle (10) is slidably sealed and connected in the valve port shield, a blind hole is provided on the top end of the valve needle (10), the bottom end of the screw (3) is inserted into the blind hole, a spring (8) is provided in the blind hole, the bottom end of the screw (3) is spherical, and the top end of the spring (8) is against the spherical surface, a shaft sleeve (7) is movably sleeved on the outer wall of the screw (3), and the shaft sleeve (7) is fixedly installed at the opening of the blind hole.

2. The valve needle and screw flexible connection structure for an electronic expansion valve according to claim 1, characterized in that: The top opening of the conical valve port (12) is conical, the bottom end of the valve needle (10) is conical, and the outer wall of the bottom end of the valve needle (10) fits with the top opening of the conical valve port (12).

3. The valve needle and screw flexible connection structure for an electronic expansion valve according to claim 1, characterized in that: The outer wall of the nut (4) is sleeved with a spring guide rail (5) and a stopper (6).

4. The valve needle and screw flexible connection structure for an electronic expansion valve according to claim 1, characterized in that: A sleeve (1) is welded and fixed to the top end of the valve seat (9), and the rotor (2) is located inside the sleeve (1).

5. The valve needle and screw flexible connection structure for an electronic expansion valve according to claim 1, characterized in that: The valve seat (9) and the valve port shield are fixed by welding.

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