Low noise normally open electromagnetic expansion valve

Abstract

The utility model discloses a low noise normally open electromagnetic expansion valve, including valve seat subassembly and valve pipe subassembly, valve seat subassembly includes valve seat and valve core pad assembly, and valve core pad assembly is located in the valve seat, and with valve seat fixed cooperation, valve pipe subassembly includes valve core pipe, valve needle and moving iron core, and moving iron core is located in the valve core pipe, and with valve core pipe sliding fit, and with moving iron core sliding fit, and the bottom flow passageway in moving iron core, and is located in the just above of valve core pad assembly, the upper end of valve core pipe still is provided with the end cap, and the end cap is inserted with valve core pipe fixedly, and the upper end of valve seat is provided with the buffer groove, and is provided with the buffer tube in the buffer groove, and the buffer tube is connected to the buffer groove below, and the upper end of buffer tube is located in the valve core pipe, and the valve needle passes through the buffer tube, and with its sliding fit, the utility model discloses reasonable structure, can reduce the metal attraction sound of opening and closing through setting buffer tube.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valves, and in particular to a low-noise normally open solenoid expansion valve. Background Technology

[0002] Solenoid valves are electromagnetically controlled industrial devices, fundamental components of automation systems used to control fluids. They are actuators, not limited to hydraulic or pneumatic systems. Used in industrial control systems to adjust the direction, flow rate, speed, and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, ensuring both precision and flexibility.

[0003] Existing solenoid valves produce a metallic clicking sound during operation, which can be quite jarring in quiet environments. Reducing the noise of solenoid valves during operation is a current research focus. To address this issue, a solution is proposed below. Utility Model Content

[0004] The purpose of this invention is to provide a low-noise normally open electromagnetic expansion valve, which has the advantage of reducing the noise generated when the electromagnetic valve is working.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A low-noise normally open electromagnetic expansion valve includes a valve seat assembly and a valve tube assembly. The valve seat assembly includes a valve seat and a valve core gasket assembly, the valve core gasket assembly being located inside the valve seat and fixedly engaged with it. The valve tube assembly includes a valve core tube, a valve needle, and a moving iron core. The moving iron core is located inside the valve core tube and slidably engaged with it. One end of the valve needle passes through a flow channel inside the moving iron core and slidably engages with it. Another end of the valve needle passes through a bottom flow port at the lower end of the moving iron core and is located directly above the valve core gasket assembly. A cap is also provided at the upper end of the valve core tube, the cap being inserted and fixedly connected to the valve core tube. A buffer groove is provided at the upper end of the valve seat, and a buffer tube is provided inside the buffer groove. The lower end of the buffer tube is snapped into the buffer groove, the upper end of the buffer tube being located inside the valve core tube. The valve needle passes through the buffer tube and slidably engages with it.

[0006] Preferably, a side flow port is provided on one side of the valve core tube, and the side flow port connects the flow channel and the inner cavity of the valve core tube.

[0007] Preferably, one end of the valve needle is fixed with a valve needle head, the diameter of the valve needle head is larger than the diameter of the valve needle, the valve needle head is located in the flow channel and slides with the moving iron core, and the diameter of the valve needle head is larger than the diameter of the bottom flow port.

[0008] Preferably, an upper spring is provided in the flow channel of the moving iron core. The upper end of the upper spring is fixedly connected to the lower end of the end cap, and the lower end of the upper spring abuts against the upper end of the valve needle and is fixedly connected to the valve needle.

[0009] Preferably, the buffer tube has an upper channel and a lower channel. The diameter of the upper channel is larger than that of the lower channel. The upper channel and the lower channel are connected. A lower spring is provided in the upper channel. The diameter of the lower spring is larger than that of the lower channel. The lower end of the lower spring is fixed to the upper end face of the lower channel. The upper end of the lower spring passes through the bottom flow port and is fixedly connected to the lower end face of the valve needle.

[0010] Preferably, the lower end of the moving iron core is provided with an inverted frustum-shaped sealing part, the inner cavity of the valve core tube is fixed with a sealing groove that cooperates with the sealing part, the upper end of the buffer tube is located in the sealing groove, and the part of the buffer tube located in the sealing groove is frustum-shaped.

[0011] Preferably, the valve seat has an external thread on its outer edge, and a pagoda spring is provided inside the valve seat, with the upper end of the pagoda spring abutting against the lower end face of the valve core gasket assembly.

[0012] Preferably, a lower sealing ring is fitted on the valve seat, and an upper sealing ring is fitted on the end cap.

[0013] The beneficial effects of this utility model are as follows: Through the ingenious design of the buffer and spring system, this utility model significantly reduces the noise generated during the operation of the solenoid valve while maintaining its fast response and reliable sealing, making it particularly suitable for occasions where quiet operation is required. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 This is a cross-sectional view of an embodiment.

[0015] Reference numerals in the attached diagram: 1. Valve seat; 2. Valve core gasket assembly; 3. Valve core tube; 4. Valve needle; 5. Moving iron core; 6. End cap; 7. Buffer tube; 8. Side flow port; 9. Flow channel; 10. Bottom flow port; 11. Valve needle head; 12. Upper spring; 13. Upper channel; 14. Lower channel; 15. Lower spring; 16. Sealing part; 17. Sealing groove; 18. External thread; 19. Pagoda spring; 20. Lower sealing ring; 21. Upper sealing ring. Detailed Implementation

[0016] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model's concept should be protected. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom" and "top," "inner" and "outer" refer to directions toward or away from the geometric center of a specific component.

[0017] like Figure 1 and Figure 2 As shown, a low-noise normally open electromagnetic expansion valve mainly consists of two parts: a valve seat assembly 1 and a valve pipe assembly. The valve seat assembly 1 includes a valve seat 1 and a valve core gasket assembly 2, wherein the valve core gasket assembly 2 is fixedly installed inside the valve seat 1, forming the sealing basis for the fluid inlet and outlet. Inside the valve seat 1, a pagoda spring 19 is also provided, the top of which supports the lower end of the valve core gasket assembly 2 to ensure its stable sealing position. The external thread 18 and the pagoda spring 19 provide convenient installation and preload for the internal components, respectively, ensuring the stability and sealing reliability of the valve core gasket assembly 2 during operation.

[0018] In addition, a lower sealing ring 20 is fitted on the valve seat 1, which effectively prevents external leakage when the valve seat 1 is connected to external equipment.

[0019] The valve tube assembly includes a valve core tube 3, a valve needle 4, and a moving iron core 5. The moving iron core 5 is fitted on the valve needle 4 and is placed inside the valve core tube 3. The moving iron core 5 and the valve core tube 3 are in a sliding fit relationship, which allows the moving iron core 5 to move axially inside the valve core tube 3.

[0020] The upper end of the valve needle 4 is provided with a valve needle head 11 with a larger diameter. The valve needle head 11 is located in the flow channel 9 inside the moving iron core 5 and slides in cooperation with the moving iron core 5. The lower end of the valve needle 4 passes through the bottom flow port 10 at the lower end of the moving iron core 5 and an independent buffer tube 7 in sequence, and finally points to the valve core pad assembly 2.

[0021] The upper end of the valve core tube 3 is sealed by a cap 6, which is connected to the valve core tube 3 by a plug-in connection. To ensure a tight seal, an upper sealing ring 21 is also fitted onto the cap 6.

[0022] A buffer groove is opened on the upper end face of the valve seat 1. The lower end of the buffer tube 7 is snapped and fixed in the buffer groove, while the upper end of the buffer tube 7 extends into the inner cavity of the valve core tube 3. The valve needle 4 passes precisely through the interior of the buffer tube 7 and forms a sliding fit with it.

[0023] To control the flow path, a side flow port 8 is opened on the wall of the valve core tube 3. This opening connects the flow channel 9 of the moving iron core 5 with the inner cavity of the valve core tube 3. Inside the flow channel 9 of the moving iron core 5, there is an upper spring 12. The upper end of the upper spring 12 is fixed to the lower end of the end cap 6, and the lower end abuts against and is fixed to the upper end face of the valve needle 11.

[0024] Meanwhile, inside the buffer tube 7, there is an upper channel 13 with a larger diameter and a lower channel 14 with a smaller diameter. A lower spring 15 is placed inside the upper channel 13. The lower end of the lower spring 15 is fixed on the stepped surface of the two channels, and its upper end passes through the bottom flow port 10 of the moving iron core 5 and is finally fixedly connected to the lower end face of the valve needle 11.

[0025] The two springs work together to quickly reset the valve needle 4 when the power is off.

[0026] A frustum-shaped sealing part 16 is designed at the lower end of the moving iron core 5, and a matching sealing groove 17 is fixed at the corresponding position inside the valve core tube 3. The upper part of the buffer tube 7 is located exactly in this sealing groove 17, and its external shape is also machined into a frustum shape to match the sealing structure. For ease of installation, the valve seat 1 is machined with external threads 18.

[0027] An upper sealing ring 21 is fitted on the end cap 6 to ensure the external sealing of the entire solenoid valve when it is connected to the system.

[0028] At the instant the solenoid valve is energized to close or de-energized to open, the moving iron core 5 drives the valve needle 4 to move. At this time, the upper spring 12 is stretched and the lower spring 15 is compressed, generating an upward elastic force on the valve needle 4. After the power is de-energized, the valve needle 4 is pushed upward.

[0029] The upper part of the frustum-shaped buffer tube 7 will be pressed down by the lower end of the passive iron core 5, so that the moving iron core 5 will not contact the sealing groove 17 instantly, thus fundamentally reducing the traditional "click" metal suction sound.

[0030] The buffer tube 7 plays multiple roles in this process: firstly, it provides precise guidance and mounting base for the lower spring 15; secondly, its robust structure itself can limit excessive offset of the valve needle 4, ensuring the linearity of the movement.

[0031] Finally, it cooperates with the sealing groove 17 of the valve core tube 3, so that it can make contact with metal before the moving iron core 5 falls, further buffering and reducing impact noise.

[0032] The design of the side flow port 8 ensures that the fluid can smoothly enter the inner cavity of the valve core tube 3 from the flow channel 9, providing the necessary pressure balance and fluid passage for the movement of the moving iron core 5, and ensuring the sensitivity of the valve response.

[0033] In summary, this utility model, through its ingenious design of a buffer and spring system, significantly reduces the noise generated during the operation of the solenoid valve while maintaining its rapid response and reliable sealing, making it particularly suitable for applications requiring high quietness.

[0034] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low noise, normally open electromagnetic expansion valve comprising a valve seat (1) assembly and a valve tube assembly, characterized in that, The valve seat (1) assembly includes a valve seat (1) and a valve core gasket assembly (2). The valve core gasket assembly (2) is located inside the valve seat (1) and is fixedly fitted with the valve seat (1). The valve tube assembly includes a valve core tube (3), a valve needle (4), and a moving iron core (5). The moving iron core (5) is located inside the valve core tube (3) and is slidably fitted with the valve core tube (3). One end of the valve needle (4) passes through the flow channel (9) inside the moving iron core (5) and is slidably fitted with the moving iron core (5). The bottom flow port (10) at the lower end of the iron core (5) is located directly above the valve core gasket assembly (2). The upper end of the valve core tube (3) is also provided with a cap (6). The cap (6) is inserted and fixed to the valve core tube (3). The upper end of the valve seat (1) is provided with a buffer groove. A buffer tube (7) is provided in the buffer groove. The lower part of the buffer tube (7) is snapped into the buffer groove. The upper end of the buffer tube (7) is located in the valve core tube (3). The valve needle (4) passes through the buffer tube (7) and slides with it.

2. A low noise normally open electromagnetic expansion valve according to claim 1, characterized in that A side flow port (8) is also provided on one side of the valve core tube (3), and the side flow port (8) connects the flow channel (9) and the inner cavity of the valve core tube (3).

3. A low noise normally open electromagnetic expansion valve according to claim 2, wherein One end of the valve needle (4) is fixed with a valve needle head (11). The diameter of the valve needle head (11) is larger than the diameter of the valve needle (4). The valve needle head (11) is located in the flow channel (9) and slides with the moving iron core (5). The diameter of the valve needle head (11) is larger than the diameter of the bottom flow port (10).

4. A low noise normally open electromagnetic expansion valve according to claim 3, wherein An upper spring (12) is provided in the flow channel (9) of the moving iron core (5). The upper end of the upper spring (12) is fixedly connected to the lower end of the end cap (6). The lower end of the upper spring (12) abuts against the upper end of the valve needle (11) and is fixedly connected to the valve needle (11).

5. A low noise normally open electromagnetic expansion valve according to claim 4, wherein The buffer tube (7) is provided with an upper channel (13) and a lower channel (14). The diameter of the upper channel (13) is larger than the diameter of the lower channel (14). The upper channel (13) and the lower channel (14) are connected. A lower spring (15) is provided in the upper channel (13). The diameter of the lower spring (15) is larger than the diameter of the lower channel (14). The lower end of the lower spring (15) is fixed to the upper end face of the lower channel (14). The upper end of the lower spring (15) passes through the bottom flow port (10) and is fixedly connected to the lower end face of the valve needle (11).

6. A low noise normally open electromagnetic expansion valve according to claim 1, wherein The lower end of the moving iron core (5) is provided with an inverted frustum-shaped sealing part (16), and the inner cavity of the valve core tube (3) is fixed with a sealing groove (17) that cooperates with the sealing part (16). The upper end of the buffer tube (7) is located in the sealing groove (17), and the part of the buffer tube (7) located in the sealing groove (17) is frustum-shaped.

7. A low noise normally open electromagnetic expansion valve according to claim 1 wherein, The valve seat (1) has an external thread (18) on its outer edge, and a pagoda spring (19) is provided inside the valve seat (1). The upper end of the pagoda spring (19) abuts against the lower end face of the valve core gasket assembly (2).

8. A low noise normally open electromagnetic expansion valve according to claim 1 wherein, The valve seat (1) is fitted with a lower sealing ring (20), and the end cap (6) is fitted with an upper sealing ring (21).

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