Normally open type two-position two-way fluid valve

Abstract

The utility model discloses a normally open type two-position two-way fluid valve which comprises a valve body, a valve cover is arranged on the valve body, a pilot head assembly is arranged on the valve cover, the valve body is provided with an inlet, an outlet and a valve port, a diaphragm assembly is arranged between the valve cover and the valve body, the position of the diaphragm assembly corresponds to that of the valve port, and an upper cavity is formed between the diaphragm assembly and the valve cover. The membrane assembly is provided with a channel A and a channel B. The pilot head assembly is used for opening or blocking the channel B. The pilot head assembly is provided with a locking assembly which comprises a locking rod, an adjusting sleeve and a connecting base, one end of the connecting base is fixedly connected with the pilot head assembly, the other end of the connecting base is connected with a flange, and the connecting base is provided with a plurality of conical holes. Each conical hole is provided with a steel ball, the adjusting sleeve is movably arranged on the connecting base in a sleeved mode, an elastic reset piece is arranged between the adjusting sleeve and the connecting base, the locking rod is movably arranged in the connecting base, the locking rod is provided with a protruding part and a locking assembly, and therefore the fluid valve can be kept in a normally-closed state and is convenient to overhaul.

Description

Technical Field

[0001] The utility model relates to the technical field of valve pipeline equipment, in particular to a normally open two-position two-way fluid valve. Background Art

[0002] In modern industry and daily life, valves, as a device for controlling the flow of fluids, play a vital role. Among the many types of valves, normally open two-position two-way fluid valves are widely used due to their unique structure and function. Normally open two-position two-way fluid valves remain open when there is no external force, allowing fluid to pass freely. When the valve needs to be closed, the opening and closing mechanism is activated through external operation (such as electric, pneumatic or manual), thereby changing the on-off state of the valve. In the closed state, the valve can effectively prevent the passage of fluid and achieve precise control of the fluid system.

[0003] Normally open two-position two-way fluid valves usually include a valve body, a pilot assembly and a diaphragm assembly. A fluid channel is provided inside the valve body. The diaphragm assembly is the core component of the valve to achieve sealing and control the opening or closing of the fluid channel. The pilot assembly is usually composed of an electromagnet, a spring and other components. When the electromagnet is not energized, the diaphragm assembly is in the default position and the valve remains open. When the electromagnet is energized, the magnetic force generated overcomes the force of the spring. The diaphragm assembly is acted upon by the pilot assembly and clings to the fluid channel of the valve body. The valve is closed to prevent the passage of the fluid. In some cases, the fluid valve needs to be closed for maintenance, inspection or adjustment. At this time, the valve is closed by the action of the pilot assembly. During maintenance, the valve needs to be kept in a normally closed state, and the coil of the electromagnet cannot be energized for a long time, which affects the maintenance work. Therefore, it is necessary to improve it. Utility Model Content

[0004] The utility model aims to provide a normally open two-position two-way fluid valve in view of the defects and shortcomings of the prior art, which has a simple and reasonable structure, is easy to operate, and is provided with a locking component so that the fluid valve can be kept in a normally closed state for easy maintenance.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The normally open two-position two-way fluid valve described in the utility model comprises a valve body, a valve cover is provided on the valve body, a pilot head assembly is provided on the valve cover, the valve body is provided with an inlet, an outlet and a valve port, the inlet is connected with the outlet through the valve port, a diaphragm assembly is provided between the valve cover and the valve body, the position of the diaphragm assembly corresponds to the valve port, an upper chamber is formed between the diaphragm assembly and the valve cover, a channel A connecting the inlet and the upper chamber and a channel B connecting the upper chamber and the outlet are provided on the diaphragm assembly, the pilot head assembly is used to open or block the channel B, and the pilot head assembly is also provided with There is a locking assembly, which includes a locking rod, an adjusting sleeve and a connecting seat. One end of the connecting seat is fixedly connected to the pilot head assembly, and the other end of the connecting seat is connected to a flange. The end of the connecting seat close to the flange is evenly provided with a plurality of conical holes along the circumferential direction, and a steel ball is installed in each conical hole. The adjusting sleeve is movably mounted on the connecting seat, and an elastic reset member is provided between the adjusting sleeve and the connecting seat. The locking rod is movably inserted into the connecting seat, so that the pilot head assembly maintains a state of closing channel B, and the locking rod is provided with a protrusion that cooperates with the steel ball.

[0007] Furthermore, the diaphragm assembly includes a diaphragm seat, a tray, a diaphragm body and a gasket arranged in sequence from top to bottom, the diaphragm seat is embedded in the center of the diaphragm body, the center of the diaphragm seat is provided with the channel B, and the tray and the gasket respectively press the upper and lower end surfaces of the diaphragm body.

[0008] Furthermore, a base is fixedly connected to the valve cover, and the pilot head assembly is fixedly connected to the valve cover via the base.

[0009] Furthermore, the guide head assembly includes a sleeve seat, a static iron core, a moving iron core, a coil, a guide rod and a guide head assembly, the coil is fixedly arranged on the outer periphery of the sleeve seat, the static iron core is fixedly installed on the inner lower end of the sleeve seat, the moving iron core is movably installed on the interior of the sleeve seat and is located at the upper end of the static iron core and cooperates with the static iron core, the guide rod is movably arranged in the static iron core, the upper end of the guide rod is abutted against the moving iron core, and the lower end of the guide rod is abutted against the guide head assembly, the guide head assembly is used to open or block channel B, and a reset spring is provided between the base and the guide head assembly, so that the guide head assembly always has a tendency to open channel B.

[0010] Further, the guide head assembly includes a sealing head, a small spring and a sealing head cover, the upper end of the sealing head cover abuts against the lower end of the guide rod, the lower end of the sealing head cover is provided with a mounting groove, the inner circumference of the mounting groove is provided with a convex ring, the small spring and the sealing head are arranged in the mounting groove, the upper end of the small spring abuts against the mounting groove, and the lower end of the small spring abuts against the sealing head, so that the sealing head and the convex ring are limitedly matched, and the sealing head is used to seal the channel B.

[0011] Furthermore, a step portion is provided inwardly at the lower end of the base, the lower end of the return spring abuts against the step portion, and the upper end of the return spring abuts against the guide head assembly.

[0012] Furthermore, a junction box is provided on the pilot head assembly, and a power supply assembly for controlling the operation of the pilot head assembly is provided in the junction box.

[0013] Furthermore, the valve cover and the valve body are fixedly connected by hexagonal screws.

[0014] Furthermore, the diaphragm seat is in the shape of an I.

[0015] Furthermore, a first O-ring is provided between the base and the pilot head assembly.

[0016] The beneficial effects of the utility model are as follows: the normally open two-position two-way fluid valve described in the utility model, when the components in the valve body are damaged and need to be replaced, or the fluid valve has problems such as leakage and needs to be repaired and inspected, during the inspection, the fluid valve needs to be kept in a normally closed state, the coil cannot be energized for a long time, and a locking component is provided so that the fluid valve can be kept in a normally closed state, which is convenient for inspection.

[0017] When locking is required, move the adjusting sleeve toward the direction of the pilot head assembly to overcome the elastic force of the elastic reset piece. When the adjusting sleeve moves, a gap is formed between the adjusting sleeve and the tapered hole for the steel ball to move. Press the locking rod so that the protrusion of the locking rod pushes the steel ball out of the tapered hole into the gap. Release the adjusting sleeve, and the adjusting sleeve rebounds under the elastic force of the elastic reset piece, and pushes the steel ball back into the tapered hole and clamps the protrusion, that is, the steel ball locks the locking rod, so that the pilot head assembly maintains the state of closing channel B.

[0018] When unlocking, move the adjusting sleeve toward the direction of the pilot head assembly to overcome the elastic force of the elastic reset piece. When the adjusting sleeve moves, a gap is formed between the adjusting sleeve and the tapered hole for the steel ball to move. Pull the locking rod outward so that the protrusion pushes the steel ball out of the tapered hole into the gap, releasing the lock of the locking rod by the steel ball. Release the adjusting sleeve, and the adjusting sleeve rebounds under the elastic force of the elastic reset piece, and pushes the steel ball back into the tapered hole.

[0019] The working principle of the utility model is as follows: in the initial state, the valve port is in an open state, the fluid at the inlet flows out to the outlet through the valve port, and part of the fluid enters the upper chamber through channel A. When the coil of the pilot head assembly is not energized, the sealing head is separated from channel B, and the fluid in the upper chamber flows out to the outlet through channel B. When the coil of the pilot head assembly is energized, a magnetic field is generated, and the moving iron core moves closer to the static iron core, driving the guide rod and pushing the pilot head assembly to block channel B, thereby increasing the pressure in the upper chamber. Under the action of the air pressure and the pilot head assembly, the diaphragm assembly is pressed against the valve port, and the valve port is in a closed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model in the initial state;

[0021] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at B in the middle;

[0022] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure at point A in the middle;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the coil of the utility model when it is energized;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure when the lock rod of the utility model is pressed down.

[0025] Figure 1-5 In: 1. Valve body; 2. Valve cover; 3. Inlet; 4. Outlet; 5. Valve port; 6. Diaphragm assembly; 7. Upper chamber; 8. Channel A; 9. Channel B; 10. Lock rod; 11. Adjustment sleeve; 12. Connecting seat; 13. Conical hole; 14. Steel ball; 15. Elastic reset member; 16. Raised part; 17. Flange; 18. Diaphragm seat; 19. Tray; 20. Diaphragm body; 21. Gasket; 22. Base; 23. Sleeve seat; 24. Static iron core; 25. Moving iron core; 26. Coil; 27. Guide rod; 28. Sealing head; 29. ​​Small spring; 30. Sealing head cover; 31. Mounting groove; 32. Raised ring; 33. Stepped part; 34. Reset spring; 35. Junction box; 36. Hexagon screw; 37. First O-ring; 38. Second O-ring; 39. Square nameplate. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings.

[0027] like Figure 1-5 The normally open two-position two-way fluid valve shown in the figure comprises a valve body 1, a valve cover 2 is provided on the valve body 1, a pilot head assembly is provided on the valve cover 2, the valve body 1 is provided with an inlet 3, an outlet 4 and a valve port 5, the inlet 3 is connected with the outlet 4 through the valve port 5, a diaphragm assembly 6 is provided between the valve cover 2 and the valve body 1, the position of the diaphragm assembly 6 corresponds to the position of the valve port 5, an upper chamber 7 is formed between the diaphragm assembly 6 and the valve cover 2, a channel A8 connecting the inlet 3 and the upper chamber 7 and a channel B9 connecting the upper chamber 7 and the outlet 4 are provided on the diaphragm assembly 6, the pilot head assembly is used to open or block the channel B9, and a locking assembly is also provided on the pilot head assembly, see Figure 2The locking assembly includes a locking rod 10, an adjusting sleeve 11 and a connecting seat 12. One end of the connecting seat 12 is fixedly connected to the pilot head assembly, and the other end of the connecting seat 12 is connected to a flange 17. The connecting seat 12 is evenly provided with a plurality of tapered holes 13 along the circumferential direction at one end close to the flange 17. A steel ball 14 is installed in each tapered hole 13. The adjusting sleeve 11 is movably sleeved on the connecting seat 12. An elastic reset member 15 is provided between the adjusting sleeve 11 and the connecting seat 12. The locking rod 10 is movably inserted into the connecting seat 12. A protrusion 16 cooperating with the steel ball 14 is provided on the locking rod 10.

[0028] When parts in the valve body 1 are damaged and need to be replaced, or when the fluid valve has problems such as leakage and needs to be repaired and inspected, it is necessary to maintain the normally closed state during maintenance. The coil 26 cannot be energized for a long time. A locking assembly is provided so that the valve body 1 can be maintained in the normally closed state for easy maintenance.

[0029] Specifically, the adjusting sleeve 11 is moved toward the pilot head assembly to overcome the elastic force of the elastic reset member 15. When the adjusting sleeve 11 moves, a gap is formed between the adjusting sleeve 11 and the tapered hole 13 for the steel ball 14 to move. The locking rod 10 is pressed down so that the protrusion 16 of the locking rod 10 pushes the steel ball 14 out of the tapered hole 13 into the gap. The adjusting sleeve 11 is released. The adjusting sleeve 11 rebounds under the elastic force of the elastic reset member 15 and pushes the steel ball 14 back into the tapered hole 13 and clamps the protrusion 16, that is, the steel ball 14 locks the locking rod 10. See FIG. Figure 5 , so that the pilot head assembly maintains a closed channel B9 state.

[0030] When unlocking, the adjusting sleeve 11 is moved toward the direction of the pilot head assembly to overcome the elastic force of the elastic reset piece 15. When the adjusting sleeve 11 moves, a gap is formed between the adjusting sleeve 11 and the tapered hole 13 for the steel ball 14 to move. The locking rod 10 is pulled outward so that the protrusion 16 pushes the steel ball 14 out of the tapered hole 13 into the gap, releasing the lock of the locking rod 10 by the steel ball 14, and releasing the adjusting sleeve 11. The adjusting sleeve 11 rebounds under the elastic force of the elastic reset piece 15 and pushes the steel ball 14 back into the tapered hole 13.

[0031] Preferably, in this embodiment, refer to Figure 3The diaphragm assembly 6 includes a diaphragm seat 18, a tray 19, a diaphragm body 20 and a gasket 21 which are arranged in sequence from top to bottom. The diaphragm seat 18 is embedded in the center of the diaphragm body 20 to ensure a close fit between the diaphragm seat 18 and the diaphragm body 20. The center of the diaphragm seat 18 is provided with the channel B9. The outer circumference of the tray 19 is bent upward to form a retaining ring. The tray 19 and the gasket 21 respectively press the upper and lower end surfaces of the diaphragm body 20, so that the connection is more firm and the sealing effect is better. When the diaphragm body 20 vibrates due to the fluid pressure, the tray 19 and the gasket 21 can absorb and eliminate part of the pressure, thereby improving the pressure regulating effect of the diaphragm assembly 6.

[0032] Preferably, in this embodiment, a base 22 is fixedly connected to the valve cover 2, and the pilot head assembly is fixedly connected to the valve cover 2 via the base 22, and the connection structure is stable and reliable. Specifically, a square nameplate 39 is also fixedly provided on the pilot head assembly, and the square nameplate 39 facilitates people to understand the use of the fluid valve.

[0033] Preferably, in this embodiment, the pilot head assembly includes a sleeve seat 23, a static iron core 24, a moving iron core 25, a coil 26, a guide rod 27 and a guide head assembly, the coil 26 is fixedly arranged on the outer periphery of the sleeve seat 23, the static iron core 24 is fixedly installed on the inner lower end of the sleeve seat 23, the moving iron core 25 is movably installed in the interior of the sleeve seat 23 and is located at the upper end of the static iron core 24 and cooperates with the static iron core 24, the guide rod 27 is movably arranged in the static iron core 24, the upper end of the guide rod 27 is abutted against the moving iron core 25, and the lower end of the guide rod 27 is abutted against the guide head assembly, the guide head assembly is used to open or block the channel B9, and a return spring 34 is provided between the base 22 and the guide head assembly. Specifically, a step portion 33 is provided inwardly at the lower end of the base 22, the lower end of the return spring 34 is abutted against the step portion 33, and the upper end of the return spring 34 is abutted against the guide head assembly, so that the guide head assembly always has a tendency to open the channel B9.

[0034] Specifically, see Figure 4 When the power is on, the coil 26 generates a magnetic field, and the moving iron core 25 overcomes the elastic force of the return spring 34 under the action of the magnetic force and is attracted to the static iron core 24, driving the guide rod 27 and pushing the guide head assembly to block the channel B9, see Figure 1 When the current is disconnected, the electromagnetic force disappears, the moving iron core 25 quickly returns to its original position under the action of the return spring 34, and the channel B9 is opened.

[0035] Preferably, in this embodiment, the guide head assembly includes a sealing head 28, a small spring 29 and a sealing head cover 30, the upper end of the sealing head cover 30 is abutted against the lower end of the guide rod 27, the lower end of the sealing head cover 30 is provided with a mounting groove 31, the inner circumference of the mounting groove 31 is provided with a convex ring 32, the small spring 29 and the sealing head 28 are arranged in the mounting groove 31, the upper end of the small spring 29 is abutted against the mounting groove 31, and the lower end of the small spring 29 is abutted against the sealing head 28, under the elastic force of the small spring 29, the sealing head 28 and the convex ring 32 are limited and matched, so that the sealing head 28 is not easy to detach, and the sealing head 28 is used to block the channel B9.

[0036] Preferably, in this embodiment, a junction box 35 is further provided on the pilot head assembly, and a power-on assembly for controlling the operation of the pilot head assembly is provided in the junction box 35. Specifically, the power-on assembly is connected to the coil 26 to control the coil 26 to be energized.

[0037] Preferably, in this embodiment, the valve cover 2 and the valve body 1 are fixedly connected by a hexagonal screw 36. The connection method is simple, firm and easy to maintain. Specifically, a spring washer is provided between the hexagonal screw 36 and the valve cover 2, which further improves the stability and sealing of the connection. When the hexagonal screw 36 is tightened, the spring washer is compressed and generates an elastic reaction force, which can offset part of the loosening force caused by vibration or temperature change, thereby maintaining the stability of the connection.

[0038] Preferably, in this embodiment, the diaphragm seat 18 is in an “I” shape, so that the diaphragm seat 18 has high structural stability and load-bearing capacity, and can effectively resist fluid pressure and vibration.

[0039] Preferably, in this embodiment, a first O-ring 37 is provided between the base 22 and the pilot head assembly to ensure a tight fit between the base 22 and the pilot head assembly and prevent fluid leakage, thereby improving sealing performance.

[0040] Preferably, in this embodiment, a second O-ring 38 is provided between the valve body 1 and the diaphragm body 20 to ensure a tight fit between the valve body 1 and the diaphragm body 20 and prevent fluid leakage, thereby improving sealing performance.

[0041] The working principle of the utility model is as follows: in the initial state, the valve port 5 is in an open state, and the fluid at the inlet 3 flows out to the outlet 4 through the valve port 5, and part of the fluid enters the upper chamber 7 through the channel A8. When the coil 26 of the pilot head assembly is not energized, the sealing head 28 is separated from the channel B9, and the fluid in the upper chamber 7 flows out to the outlet 4 through the channel B9. When the coil 26 of the pilot head assembly is energized, a magnetic field is generated, and the moving iron core 25 moves closer to the static iron core 24, driving the guide rod 27 and pushing the pilot head assembly to block the channel B9, so that the pressure in the upper chamber 7 increases. Under the action of the air pressure and the pilot head assembly, the diaphragm assembly 6 is pressed against the valve port 5, and the valve port 5 is in a closed state.

[0042] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A normally open two-position two-way fluid valve, comprising a valve body (1), a valve cover (2) being provided on the valve body (1), a pilot head assembly being provided on the valve cover (2), the valve body (1) being provided with an inlet (3), an outlet (4) and a valve port (5), the inlet (3) being connected to the outlet (4) via the valve port (5), a diaphragm assembly (6) being provided between the valve cover (2) and the valve body (1), the diaphragm assembly (6) being located at positions corresponding to the valve port (5), an upper chamber (7) being formed between the diaphragm assembly (6) and the valve cover (2), characterized in that: The diaphragm assembly (6) is provided with a channel A (8) connecting the inlet (3) and the upper chamber (7) and a channel B (9) connecting the upper chamber (7) and the outlet (4); the pilot head assembly is used to open or block the channel B (9); the pilot head assembly is also provided with a locking assembly, the locking assembly comprising a locking rod (10), an adjusting sleeve (11) and a connecting seat (12); one end of the connecting seat (12) is fixedly connected to the pilot head assembly, the other end of the connecting seat (12) is connected to a flange (17), and the connecting seat (12) is close to the pilot head assembly. A plurality of tapered holes (13) are evenly arranged along the circumferential direction at one end of the proximal flange (17), a steel ball (14) is installed in each tapered hole (13), an adjustment sleeve (11) is movably sleeved on the connecting seat (12), an elastic reset member (15) is provided between the adjustment sleeve (11) and the connecting seat (12), a locking rod (10) is movably inserted into the connecting seat (12), so that the pilot head assembly maintains a state of closing the channel B (9), and a protrusion (16) is provided on the locking rod (10) that cooperates with the steel ball (14).

2. The normally open two-position two-way fluid valve according to claim 1, characterized in that: The diaphragm assembly (6) comprises a diaphragm seat (18), a tray (19), a diaphragm body (20) and a gasket (21) which are arranged in sequence from top to bottom. The diaphragm seat (18) is embedded in the center of the diaphragm body (20). The center of the diaphragm seat (18) is provided with the channel B (9). The tray (19) and the gasket (21) respectively press the upper and lower end surfaces of the diaphragm body (20).

3. The normally open two-position two-way fluid valve according to claim 1, characterized in that: A base (22) is fixedly connected to the valve cover (2), and the pilot head assembly is fixedly connected to the valve cover (2) via the base (22).

4. The normally open two-position two-way fluid valve according to claim 3, characterized in that: The pilot head assembly comprises a sleeve seat (23), a static iron core (24), a moving iron core (25), a coil (26), a guide rod (27) and a pilot head assembly, wherein the coil (26) is fixedly arranged on the outer periphery of the sleeve seat (23), the static iron core (24) is fixedly installed on the lower end of the sleeve seat (23), the moving iron core (25) is movably installed inside the sleeve seat (23) and is located at the upper end of the static iron core (24) and cooperates with the static iron core (24), the guide rod (27) is movably arranged in the static iron core (24), the upper end of the guide rod (27) abuts against the moving iron core (25), and the lower end of the guide rod (27) abuts against the pilot head assembly, the pilot head assembly is used to open or block the channel B (9), and a reset spring (34) is provided between the base (22) and the pilot head assembly, so that the pilot head assembly always has a tendency to open the channel B (9).

5. The normally open two-position two-way fluid valve according to claim 4, characterized in that: The guide head assembly comprises a sealing head (28), a small spring (29) and a sealing head cover (30); the upper end of the sealing head cover (30) abuts against the lower end of the guide rod (27); the lower end of the sealing head cover (30) is provided with a mounting groove (31); the inner circumference of the mounting groove (31) is provided with a convex ring (32); the small spring (29) and the sealing head (28) are arranged in the mounting groove (31); the upper end of the small spring (29) abuts against the mounting groove (31); the lower end of the small spring (29) abuts against the sealing head (28), so that the sealing head (28) and the convex ring (32) are limitedly matched; the sealing head (28) is used to block the channel B (9).

6. The normally open two-position two-way fluid valve according to claim 4, characterized in that: A step portion (33) is provided inwardly at the lower end of the base (22), the lower end of the return spring (34) abuts against the step portion (33), and the upper end of the return spring (34) abuts against the guide head assembly.

7. The normally open two-position two-way fluid valve according to claim 1, characterized in that: The pilot head assembly is also provided with a junction box (35), and a power supply assembly for controlling the operation of the pilot head assembly is provided in the junction box (35).

8. The normally open two-position two-way fluid valve according to claim 1, characterized in that: The valve cover (2) and the valve body (1) are fixedly connected via hexagonal screws (36).

9. The normally open two-position two-way fluid valve according to claim 2, characterized in that: The diaphragm seat (18) is in the shape of an “I”.

10. The normally open two-position two-way fluid valve according to claim 3, characterized in that: A first O-ring (37) is provided between the base (22) and the pilot head assembly.

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