Labyrinth sealing type electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a labyrinth sealing type electromagnetic valve which comprises a valve body and a piston assembly arranged at the junction of a liquid inlet and a liquid outlet of the valve body, and the labyrinth sealing type electromagnetic valve comprises a piston seat and a piston head arranged in the piston seat in a sliding mode. The mounting seat is arranged above the piston seat; the driving assembly is arranged in the mounting seat; the piston seat is provided with a first annular boss and a second annular boss; the valve body is provided with a first groove allowing the piston seat to be embedded therein, a second groove allowing the first annular boss to be embedded therein is formed in the center of the first groove, and a third groove corresponding to the second annular boss is formed in the step face of the first groove. Compared with the prior art, the labyrinth seal is formed between the piston seat and the valve body through the first annular boss and the second annular boss, the sealing performance of the electromagnetic valve is improved, the piston seat is directly inserted into the valve body, when the electromagnetic valve needs to be disassembled or replaced, the piston assembly and the valve body can be separated more easily, and the maintenance cost is reduced.

Description

Technical Field

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

[0002] Solenoid valves are essential automation components used for fluid control. In existing solenoid valve designs, the piston seat is typically connected to the valve body via threads. However, this connection method has a drawback: the threaded connection is directly exposed to the liquid medium. Over time, this connection is susceptible to corrosion, making subsequent disassembly or replacement of the solenoid valve extremely difficult. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a labyrinth sealing solenoid valve, which effectively solves the problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a labyrinth sealing solenoid valve, comprising:

[0005] Valve body;

[0006] A piston assembly is provided at the intersection of the liquid inlet and the liquid outlet of the valve body, and comprises a piston seat and a piston head slidably provided in the piston seat;

[0007] A mounting seat is provided above the piston seat and fixed on the valve body;

[0008] A drive assembly, disposed inside the mounting seat, for driving the piston head to move so as to control the opening or closing of the valve body;

[0009] Wherein, a first annular boss for mounting the piston head is provided on the bottom surface of the piston seat facing the valve body, and a second annular boss is provided on the outer edge of the first annular boss;

[0010] The valve body is provided with a first groove for the piston seat to be embedded, a second groove for the first annular boss to be embedded is provided at the center of the first groove, and a third groove corresponding to the second annular boss is provided on the step surface of the first groove.

[0011] Furthermore, a first sealing ring is provided on the boss between the second groove and the third groove.

[0012] Furthermore, the outer cylindrical surface of the first annular boss forms a convex structure in the radial direction away from the center position;

[0013] A sliding groove for accommodating the protruding structure is provided on the side wall of the second groove.

[0014] Furthermore, the bottom surface of the chute is inclined toward the center of the circle.

[0015] Furthermore, the upper surface of the piston seat is arranged flush with the mounting surface of the valve body.

[0016] Furthermore, a rubber pad is provided on the lower surface of the mounting seat at a position corresponding to the piston seat.

[0017] Furthermore, a guiding slope is provided at the end of the inner side wall of the first groove.

[0018] Furthermore, a second sealing ring is provided on the contact surface between the valve body and the mounting seat.

[0019] Furthermore, the driving assembly includes a valve needle, an elastic member and a shape memory alloy;

[0020] The elastic member and the shape memory alloy are arranged on one end of the valve needle away from the piston head, and the other end of the valve needle passes through the mounting seat and abuts against the piston seat on the piston head;

[0021] The elastic member drives the valve needle to drive the piston head to close the valve body. The shape memory alloy is deformed when energized to drive the valve needle to separate from the piston head and open the valve body.

[0022] Furthermore, a protective seat is provided on the outer side of the mounting seat.

[0023] The beneficial effects of the present utility model are as follows: compared with the prior art, a labyrinth seal is formed between the piston seat and the valve body by the first annular boss and the second annular boss, which effectively prevents leakage of the liquid medium and improves the sealing performance of the solenoid valve. The design of the piston seat being directly inserted into the valve body makes it easier to separate the piston assembly from the valve body when the solenoid valve needs to be disassembled or replaced, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the structure decomposition of the labyrinth seal solenoid valve in an embodiment of the present utility model;

[0026] Figure 2 This is a cross-sectional view of a labyrinth-sealed solenoid valve in an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the internal structure of the valve body in an embodiment of the present utility model;

[0028] Figure 4 It is a structural schematic diagram of the piston seat in the embodiment of the present utility model.

[0029] Figure numerals: 1. valve body; 11. first groove; 12. second groove; 12a. slide groove; 13. third groove; 2. piston seat; 21. first annular boss; 21a. raised structure; 22. second annular boss; 3. piston head; 4. mounting seat; 5. drive assembly; 51. valve needle; 52. elastic member; 53. shape memory alloy; 6. first sealing ring; 7. second sealing ring; 8. protective seat. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figures 1 to 4 The labyrinth seal solenoid valve shown includes: a valve body 1, a piston assembly, a mounting seat 4 and a drive assembly 5;

[0034] The piston assembly is arranged at the intersection of the liquid inlet and the liquid outlet of the valve body 1, and includes a piston seat 2 and a piston head 3 slidably arranged in the piston seat 2;

[0035] The mounting seat 4 is arranged above the piston seat 2 and fixed on the valve body 1;

[0036] The driving assembly 5 is arranged inside the mounting seat 4 and is used to drive the piston head 3 to control the opening or closing of the valve body 1;

[0037] The bottom surface of the piston seat 2 facing the valve body 1 is provided with a first annular boss 21 for mounting the piston head 3, and a second annular boss 22 is provided on the outer edge of the first annular boss 21;

[0038] The valve body 1 is provided with a first groove 11 for the piston seat 2 to be embedded, a second groove 12 is provided at the center of the first groove 11 for the first annular boss 21 to be embedded, and a third groove 13 corresponding to the second annular boss 22 is provided on the step surface of the first groove 11.

[0039] Compared with the prior art, a labyrinth seal is formed between the piston seat 2 and the valve body 1 by the first annular boss 21 and the second annular boss 22, which effectively prevents the leakage of the liquid medium and improves the sealing performance of the solenoid valve. The design of the piston seat 2 being directly inserted into the valve body 1 makes it easier to separate the piston assembly from the valve body 1 when the solenoid valve needs to be disassembled or replaced, thereby reducing maintenance costs.

[0040] In the present invention, a first sealing ring 6 is provided on the boss between the second groove 12 and the third groove 13 , which further improves the sealing effect.

[0041] In a preferred embodiment of the present invention, a protruding structure 21 a is formed on the outer cylindrical surface of the first annular boss 21 radially away from the center; and a sliding groove 12 a for accommodating the protruding structure 21 a is provided on the side wall of the second groove 12 .

[0042] The contact surface between the first annular boss 21 and the second groove 12 is stepped, which increases the contact area between the piston seat 2 and the valve body 1. After the protruding structure 21a is embedded in the sliding groove 12a, it effectively prevents the piston seat 2 from shaking or shifting during use.

[0043] Based on the above embodiment, the bottom surface of the slide groove 12a is inclined toward the center of the circle to ensure smooth installation of the piston seat 2. It also has a diversion function. When a small amount of liquid seeps into the connection between the piston seat 2 and the valve body 1, the inclined bottom surface of the slide groove 12a can guide the liquid to flow along a specific path instead of accumulating at the connection, reducing the risk of sealing failure or damage due to liquid accumulation.

[0044] In the present invention, the upper surface of the piston seat 2 is flush with the mounting surface of the valve body 1 , making it easier to align the piston seat 2 with the valve body 1 during installation without requiring complicated adjustments or calibrations.

[0045] In the preferred embodiment, a rubber pad (not shown in the figure) is provided on the lower surface of the mounting seat 4 at a position corresponding to the piston seat 2, which can absorb and buffer the friction and vibration between the piston seat 2 and the mounting seat 4, helping to reduce wear caused by long-term operation and extend the service life of the solenoid valve.

[0046] In order to guide the piston seat 2 to be smoothly inserted into the first groove 11 in the valve body 1, a guiding slope is provided at the end of the inner side wall of the first groove 11, thereby reducing resistance and friction during installation.

[0047] In the present invention, a second sealing ring 7 is provided on the contact surface between the valve body 1 and the mounting seat 4, thereby further enhancing the overall sealing performance of the solenoid valve.

[0048] In a preferred embodiment of the present invention, the drive assembly 5 includes a valve needle 51, an elastic member 52 and a shape memory alloy 53; the elastic member 52 and the shape memory alloy 53 are arranged at one end of the valve needle 51 away from the piston head 3, and the other end of the valve needle 51 passes through the mounting seat 4 and abuts against the piston seat 2 on the piston head 3; the elastic member 52 drives the valve needle 51 to drive the piston head 3 to close the valve body 1, and the shape memory alloy 53 is energized to generate deformation to drive the valve needle 51 to separate from the piston head 3 and open the valve body 1.

[0049] When the solenoid valve needs to be closed, the shape memory alloy 53 is not energized and is in its original state. At this time, the driving force of the elastic member 52 causes the valve needle 51 to tightly contact the piston head 3 to achieve sealing.

[0050] When the solenoid valve needs to be opened, the shape memory alloy 53 is energized and deformed. The force generated is greater than the driving force of the elastic member 52, thereby pushing the valve needle 51 upward and separating from the piston head 3, so that the valve body 1 is opened.

[0051] The ingenious combination of the valve needle 51, the elastic member 52 and the shape memory alloy 53 achieves precise control of the fluid medium and a highly reliable seal. This design not only improves the performance and stability of the solenoid valve.

[0052] As a preferred solution of the present invention, a protective seat 8 is provided on the outside of the mounting seat 4. The protective seat 8 can isolate dust, moisture and other pollutants in the external environment and protect the precision components inside the solenoid valve from damage.

[0053] 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 labyrinth seal solenoid valve, characterized in that: include: Valve body (1); A piston assembly is arranged at the intersection of the liquid inlet and the liquid outlet of the valve body (1), comprising a piston seat (2) and a piston head (3) slidably arranged in the piston seat (2); A mounting seat (4) is arranged above the piston seat (2) and fixed on the valve body (1); A driving assembly (5), disposed inside the mounting seat (4), and configured to drive the piston head (3) to move; Wherein, a first annular boss (21) for mounting the piston head (3) is provided on the bottom surface of the piston seat (2) facing the valve body (1), and a second annular boss (22) is provided on the outer edge of the first annular boss (21); The valve body (1) is provided with a first groove (11) for the piston seat (2) to be embedded, a second groove (12) is provided at the center of the first groove (11) for the first annular boss (21) to be embedded, and a third groove (13) corresponding to the second annular boss (22) is provided on the step surface of the first groove (11).

2. The labyrinth sealing solenoid valve according to claim 1, characterized in that: A first sealing ring (6) is provided on the boss located between the second groove (12) and the third groove (13).

3. The labyrinth sealing solenoid valve according to claim 1, characterized in that: The outer cylindrical surface of the first annular boss (21) forms a convex structure (21a) in a radial direction away from the center position; Furthermore, a sliding groove (12a) for accommodating the protruding structure (21a) is provided on the side wall of the second groove (12).

4. The labyrinth sealing solenoid valve according to claim 3, characterized in that: The bottom surface of the chute (12a) is arranged to be inclined toward the center of the circle.

5. The labyrinth seal solenoid valve according to claim 1, characterized in that: The upper surface of the piston seat (2) is arranged flush with the mounting surface of the valve body (1).

6. The labyrinth seal solenoid valve according to claim 1, characterized in that: A rubber pad is provided on the lower surface of the mounting seat (4) at a position corresponding to the piston seat (2).

7. The labyrinth seal solenoid valve according to claim 1, characterized in that: The inner side wall end of the first groove (11) is provided with a guiding slope.

8. The labyrinth seal solenoid valve according to claim 1, characterized in that: A second sealing ring (7) is provided on the contact surface between the valve body (1) and the mounting seat (4).

9. The labyrinth seal solenoid valve according to claim 1, characterized in that: The driving assembly (5) comprises a valve needle (51), an elastic member (52) and a shape memory alloy (53); The elastic member (52) and the shape memory alloy (53) are arranged at one end of the valve needle (51) away from the piston head (3); the other end of the valve needle (51) passes through the mounting seat (4) and abuts against the piston seat (2) on the piston head (3); The elastic member (52) drives the valve needle (51) to drive the piston head (3) to close the valve body (1), and the shape memory alloy (53) is energized to deform to drive the valve needle (51) to separate from the piston head (3) and open the valve body (1).

10. The labyrinth seal solenoid valve according to claim 1, characterized in that: The outer side of the mounting seat (4) is sleeved with a protective seat (8).

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