Pneumatic reset electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a pneumatic reset electromagnetic valve, which comprises a valve seat, a valve core, an electromagnetic valve core and an electromagnetic valve core, a first mounting hole and a second mounting hole are formed in the guide sleeve in the vertical direction, and a valve port is formed between the first mounting hole and the second mounting hole; the driving assembly comprises a valve needle and a screw assembly used for driving the valve needle to close or open the valve port. The piston rod is sequentially provided with an ejector rod, a second step shaft and a first step shaft along the axis. The first step shaft is arranged in the positioning hole in a sliding mode, the second step shaft is arranged in the second mounting hole in a sliding mode, a rodless cavity and a rod cavity are formed in the two ends of the first step shaft, and the valve seat is provided with a first gas circuit communicated with the rodless cavity and a second gas circuit communicated with the rod cavity. The piston rod directly drives the valve needle to act by utilizing the gas pressure, so that the valve port is quickly opened, the waiting time for opening the valve port is shortened, the initial response speed for opening the valve port is improved, the valve is helped to respond to system requirements in time, and the starting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a pneumatic reset solenoid valve. Background Art

[0002] As an electronic control component, solenoid valves are widely used in refrigeration systems due to their high precision, fast and accurate action, and obvious energy-saving effects.

[0003] In the prior art, an electronic expansion valve includes components such as a valve seat assembly, a nut assembly, an elastic assembly, a valve needle assembly, and a magnetic rotor assembly. The valve seat assembly is provided with a valve port. When the electronic expansion valve is working, the magnetic rotor assembly is driven to rotate by an energized coil surrounding the outside of the valve housing, thereby driving the screw rod in the nut assembly to produce circular motion. At the same time, the axial movement generated is transmitted to the valve needle through the elastic assembly, thereby controlling the opening or closing of the valve port, thereby achieving the functions of throttling, pressure reduction, and flow regulation.

[0004] However, in order to ensure the reliability of valve port closing, the screw rod will continue to move a certain distance after the valve needle contacts the valve port to tighten the valve needle; this results in that when opening the valve port, the screw rod needs to first unlock the pressure of the elastic component on the valve needle, and then drive the valve needle upward to open the valve port, which makes the initial response speed of the valve port opening slow, causing the solenoid valve to be unable to respond to system requirements in time during the startup process, affecting the startup efficiency. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a pneumatic reset solenoid valve to effectively solve the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a pneumatic reset solenoid valve, comprising:

[0007] a valve seat having a liquid inlet and a liquid outlet;

[0008] A guide sleeve is mounted on the positioning hole of the valve seat, and is provided with a first mounting hole and a second mounting hole in a vertical direction, and a valve port is provided between the first mounting hole and the second mounting hole;

[0009] a drive assembly, disposed above the guide sleeve, comprising a valve needle disposed in the first mounting hole, and a screw assembly connected to the valve needle for driving the valve to close or open the valve port;

[0010] a piston rod, disposed in the second mounting hole, to drive the valve needle to open the valve port;

[0011] Wherein, the piston rod is provided with a push rod, a second step shaft and a first step shaft in sequence along the axis in a direction away from the valve needle;

[0012] The first stepped shaft is slidably set in the positioning hole, and the second stepped shaft is slidably set in the second mounting hole. A rodless cavity and a rod cavity are provided at both ends of the first stepped shaft, and the valve seat is provided with a first air path connected to the rodless cavity and a second air path connected to the rod cavity.

[0013] Furthermore, the guide sleeve is provided with a first passage and a second passage for connecting the liquid inlet and the liquid outlet;

[0014] Sealing structures are provided on the outer cylindrical surface of the guide sleeve at positions corresponding to the first passage and the second passage.

[0015] Furthermore, outer contact surfaces of the first stepped shaft and the second stepped shaft are both provided with sealing structures.

[0016] Furthermore, the push rod includes a push head abutting against the valve needle, and a liquid guide ring groove provided between the push head and the second step shaft;

[0017] Furthermore, a plurality of guide grooves are provided on the outer cylindrical surface of the pushing head.

[0018] Furthermore, the plurality of guide grooves converge toward the valve needle.

[0019] Furthermore, the screw assembly includes a nut sleeve fixed on the valve seat and a screw installed in the nut sleeve, and the valve needle is connected to the screw.

[0020] Furthermore, the drive assembly further comprises a magnetic rotor assembly connected to an end of the screw assembly away from the valve needle, for driving the screw to rotate and move along the axis simultaneously.

[0021] Furthermore, the magnetic rotor assembly includes a rotating sleeve and an adapter plate connecting the rotating sleeve and the screw;

[0022] The adapter plate and the screw rod are fixed by welding.

[0023] Furthermore, the second mounting hole is provided with a first conical surface near the valve port, and the end of the push rod is provided with a second conical surface;

[0024] The inclination angle of the first conical surface is smaller than the inclination angle of the second conical surface.

[0025] The beneficial effects of the present invention are as follows: the present invention utilizes gas pressure to drive the piston rod, and the piston rod directly drives the valve needle to move, thereby quickly opening the valve port, reducing the waiting time for opening the valve port, and improving the initial response speed of the valve port opening, which helps the valve to respond to system requirements in a timely manner and improves the startup efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic structural diagram of a pneumatic reset solenoid valve in an embodiment of the present utility model;

[0028] Figure 2 This is an axonometric diagram of the installation positions of the guide sleeve and the piston rod in the embodiment of the present utility model;

[0029] Figure 3 This is a cross-sectional view of the installation position of the guide sleeve and the piston rod in the embodiment of the present utility model.

[0030] Figure markings: 1. Valve seat; 11. Liquid inlet; 12. Liquid outlet; 13. First air path; 14. Second air path; 2. Guide sleeve; 21. First mounting hole; 22. Second mounting hole; 22a. First conical surface; 23. First passage; 24. Second passage; 2a. Valve port; 3. Valve needle; 4. Screw assembly; 5. Piston rod; 51. Push rod; 51a. Second conical surface; 511. Push head; 512. Liquid guide ring groove; 513. Guide groove; 52. Second step shaft; 53. First step shaft; 6. Magnetic rotor assembly; 61. Rotating sleeve; 62. Adapter plate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] like Figures 1 to 3 The pneumatic reset solenoid valve shown includes: a valve seat 1, a guide sleeve 2, a drive assembly, and a piston rod 5. The valve seat 1 has a liquid inlet 11 and a liquid outlet 12. The guide sleeve 2 is mounted in a positioning hole of the valve seat 1 and is vertically provided with a first mounting hole 21 and a second mounting hole 22, with a valve port 2a provided between the first mounting hole 21 and the second mounting hole 22. The drive assembly is disposed above the guide sleeve 2 and includes a valve needle 3 disposed in the first mounting hole 21 and a screw assembly 4 connected to the valve needle 3 for driving the valve needle 3 to close or open the valve port 2a. The piston rod 5 is disposed in the second mounting hole 22 to drive the valve needle 3 to open the valve port 2a.

[0035] Among them, the piston rod 5 is provided with a push rod 51, a second step shaft 52 and a first step shaft 53 in sequence along the axis in the direction away from the valve needle 3; the first step shaft 53 is slidably set in the positioning hole, and the second step shaft 52 is slidably set in the second mounting hole 22. A rodless cavity and a rod cavity are provided at both ends of the first step shaft 53, and the valve seat 1 is provided with a first air path 13 connected to the rodless cavity, and a second air path 14 connected to the rod cavity.

[0036] In the utility model, the first air path 13 and the second air path 14 are both connected to the air supply source. When the valve port 2a needs to be opened, when the screw assembly 4 starts to move upward, the gas enters the rodless chamber through the first air path 13, and the piston rod 5 starts to lift the valve needle 3 upward in synchronization. At this time, the lifting speed of the valve needle 3 is controlled to be less than the rising speed of the screw assembly 4; when the screw assembly 4 begins to be able to drive the valve needle 3 to move upward, the piston rod 5 stops moving, and the gas enters the rod chamber through the second air path 14, so that the piston rod 5 returns to its initial position.

[0037] The utility model utilizes gas pressure to drive the piston rod 5, and the piston rod 5 directly drives the valve needle 3 to move, thereby quickly opening the valve port 2a, reducing the waiting time for opening the valve port 2a, and improving the initial response speed of the valve port 2a opening, which helps the valve to respond to system requirements in a timely manner and improves the startup efficiency.

[0038] In the present invention, the guide sleeve 2 is provided with a first passage 23 and a second passage 24 for connecting the liquid inlet 11 and the liquid outlet 12; direct communication between the liquid inlet 11 and the liquid outlet 12 is achieved, which helps the direct flow of fluid inside the valve, reduces fluid resistance, and improves fluid passage efficiency; and sealing structures are provided at positions corresponding to the first passage 23 and the second passage 24 on the outer cylindrical surface of the guide sleeve 2, which effectively prevents leakage of the fluid during the flow process, thereby ensuring the sealing and safety of the system.

[0039] In order to further increase the reliability of the seal, a sealing structure is provided on the outer contact surfaces of the first stepped shaft 53 and the second stepped shaft 52 .

[0040] In the preferred embodiment of the present invention, the push rod 51 includes a push head 511 that abuts the valve needle 3, and a fluid-conducting annular groove 512 disposed between the push head 511 and the second stepped shaft 52. The outer cylindrical surface of the push head 511 is provided with a plurality of fluid-conducting grooves 513. The fluid-conducting annular grooves 512 help to create a uniform fluid pressure distribution around the push rod 51, while the fluid-conducting grooves 513 on the outer cylindrical surface of the push head 511 optimize the fluid flow path, reduce direct fluid impact on the valve needle 3, and mitigate the negative effects of fluid dynamics on the valve needle 3.

[0041] As a preferred embodiment of the above solution, multiple guide grooves 513 converge toward the valve needle 3. The design of the inclined guide grooves 513 can reduce turbulence and eddy currents generated when the fluid flows at the valve port 2a, helping to maintain fluid pressure stability during valve operation, reduce pressure fluctuations, and improve the stability of the entire system.

[0042] In this utility model, the screw assembly 4 comprises a nut sleeve fixed to the valve seat 1 and a screw mounted within the nut sleeve, with the valve needle 3 connected to the screw. The screw and nut sleeve cooperate to convert rotational motion into linear motion, thereby precisely controlling the position of the valve needle 3 and achieving accurate adjustment of the valve port 2a opening.

[0043] Building on the above solution, the drive assembly also includes a magnetic rotor assembly 6, connected to the end of the screw assembly 4 away from the valve needle 3, to drive the screw to rotate and move along its axis. The magnetic rotor assembly 6 provides the power source for the screw's rotation. During operation, an energized coil surrounding the valve housing generates a magnetic field, which drives the magnetic rotor assembly 6 to rotate, synchronously driving the screw in circular motion. Simultaneously, the screw moves axially relative to the nut sleeve. This axial motion is transmitted to the valve needle 3 via a spring, controlling the opening and closing of the valve port 2a, achieving throttling, pressure reduction, and flow regulation.

[0044] Based on the above solution, the magnetic rotor assembly 6 includes a rotating sleeve 61 and an adapter plate 62 connecting the rotating sleeve 61 and the screw; the adapter plate 62 and the screw are fixed by welding to ensure that the adapter plate 62 and the screw will not move relative to each other or loosen under high load or vibration conditions, thereby enhancing the reliability of the structure.

[0045] In the preferred embodiment of the present invention, the second mounting hole 22 is provided with a first conical surface 22a near the valve port 2a, and the end of the push rod 51 is provided with a second conical surface 51a. The angle of inclination of the first conical surface 22a is smaller than that of the second conical surface 51a. When the screw assembly 4 begins to drive the valve needle 3 upward and the piston rod 5 stops, a confluence area is formed between the valve port 2a and the push rod 51. This allows the fluid to flow continuously during the valve opening process, avoiding flow interruptions caused by valve actuation and reducing sudden stops and starts of the fluid. This reduces cavitation caused by sudden changes in fluid pressure and protects the valve from damage.

[0046] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic reset solenoid valve, characterized in that: include: A valve seat (1) having a liquid inlet (11) and a liquid outlet (12); A guide sleeve (2) is mounted on the positioning hole of the valve seat (1), and is provided with a first mounting hole (21) and a second mounting hole (22) in a vertical direction, and a valve port (2a) is provided between the first mounting hole (21) and the second mounting hole (22); a drive assembly, arranged above the guide sleeve (2), comprising a valve needle (3) arranged in the first mounting hole (21), and a screw assembly (4) connected to the valve needle (3) and used to drive the valve needle (3) to close or open the valve port (2a); A piston rod (5) is arranged in the second mounting hole (22) to drive the valve needle (3) to open the valve port (2a); Wherein, the piston rod (5) is provided with a push rod (51), a second step shaft (52) and a first step shaft (53) in sequence along the axis in a direction away from the valve needle (3); The first stepped shaft (53) is slidably arranged in the positioning hole, and the second stepped shaft (52) is slidably arranged in the second mounting hole (22). A rodless cavity and a rod cavity are provided at both ends of the first stepped shaft (53), and the valve seat (1) is provided with a first air path (13) communicating with the rodless cavity, and a second air path (14) communicating with the rod cavity.

2. The pneumatic reset solenoid valve according to claim 1, characterized in that: The guide sleeve (2) is provided with a first passage (23) and a second passage (24) for communicating with the liquid inlet (11) and the liquid outlet (12); Sealing structures are provided at positions of the outer cylindrical surface of the guide sleeve (2) corresponding to the first passage (23) and the second passage (24).

3. The pneumatic reset solenoid valve according to claim 1, characterized in that: The outer contact surfaces of the first stepped shaft (53) and the second stepped shaft (52) are both provided with sealing structures.

4. The pneumatic reset solenoid valve according to claim 1, characterized in that: The push rod (51) includes a push head (511) abutting against the valve needle (3), and a liquid guide ring groove (512) provided between the push head (511) and the second stepped shaft (52); Furthermore, the outer cylindrical surface of the pushing head (511) is provided with a plurality of guide grooves (513).

5. The pneumatic reset solenoid valve according to claim 4, characterized in that: The plurality of guide grooves (513) converge toward the valve needle (3).

6. The pneumatic reset solenoid valve according to claim 1, characterized in that: The screw assembly (4) comprises a nut sleeve fixed on the valve seat (1) and a screw installed in the nut sleeve, and the valve needle (3) is connected to the screw.

7. The pneumatic reset solenoid valve according to claim 6, characterized in that: The driving assembly further comprises a magnetic rotor assembly (6), which is connected to an end of the screw assembly (4) away from the valve needle (3) and is used to drive the screw to rotate and move along the axis simultaneously.

8. The pneumatic reset solenoid valve according to claim 7, characterized in that: The magnetic rotor assembly (6) comprises a rotating sleeve (61) and an adapter plate (62) connecting the rotating sleeve (61) and the screw; The adapter plate (62) and the screw are fixed by welding.

9. The pneumatic reset solenoid valve according to claim 1, characterized in that: The second mounting hole (22) is provided with a first conical surface (22a) near the valve port (2a), and the end of the push rod (51) is provided with a second conical surface (51a); The inclination angle of the first conical surface (22a) is smaller than the inclination angle of the second conical surface (51a).

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