Normally open micro pneumatic valve

Abstract

The utility model relates to valve technical field discloses a normally open type miniature pneumatic valve, including valve body mechanism and valve core mechanism, and the valve body mechanism is set up with water inlet, water outlet, air vent and the valve hole of intercommunication water inlet and water outlet, the valve core mechanism is slidably installed in the inner chamber of valve body mechanism, and it includes: the core column, the upper end part is used for receiving gas pressure, the valve core block is fixedly connected in the lower end part of core column, is used for blocking the valve hole, the spring is covered in the outside of core column, one end is in abutment with the inner wall of valve body mechanism, and the other end acts on the core column, pushes the core column to make the valve core block separate from the valve hole when no gas pressure, keeps normally open, the utility model aims at solving the problem that the existing valve structure is complex, motion is easy to jam deflection, sealing is unreliable, the utility model relates to valve technical field discloses a normally open type miniature pneumatic valve, including valve body mechanism and valve core mechanism, and the valve body mechanism is set up with water inlet, water outlet, air vent and the valve hole of intercommunication water inlet and water outlet, the utility model discloses a normally open type miniature pneumatic valve, including valve body mechanism and valve core mechanism.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a normally open miniature pneumatic valve. Background Technology

[0002] In fields such as industrial automation, fluid control, and medical equipment, there is an increasing demand for miniaturized, high-response, and reliable fluid control valves. In particular, normally open valves play an important role in applications that require maintaining a safe passage and only temporarily closing under specific control signals. In existing technologies, normally open valves typically use a mechanical structure combined with elastic elements to achieve their default open state, and are forced to close by external driving forces such as electromagnetic force or air pressure.

[0003] However, currently used normally open pneumatic valves still face some challenges in achieving miniaturization and high reliability. To achieve the normally open function, many miniature pneumatic valves often have complex internal structures, containing many moving parts and precision mating mechanisms. This complexity not only increases the manufacturing cost and assembly difficulty of the valve, but may also lead to excessive cumulative tolerances between components, affecting the smoothness and accuracy of the valve core movement. For example, when the drive rod moves linearly over a long stroke, if there is a lack of effective guidance or limiting mechanisms, deflection or jamming may easily occur, thus affecting the normal opening or closing of the valve. In addition, too many moving parts also mean more wear points and potential sources of failure, which may cause the valve's sealing performance, reset accuracy, and overall reliability to decline after long-term use.

[0004] Therefore, there is still room for optimization in the structural design of existing normally open miniature pneumatic valves. There is an urgent need for a solution that can simplify the internal structure, reduce the number of parts, and at the same time ensure smooth and precise valve core movement, reliable sealing, and easy maintenance.

[0005] Therefore, this utility model proposes a normally open miniature pneumatic valve to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a normally open miniature pneumatic valve, which aims to improve the problems of normally open miniature pneumatic valves, such as complex structure, easy jamming or deflection of valve core movement, and low sealing reliability and reset accuracy.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a normally open miniature pneumatic valve, comprising: a valve body mechanism; and a valve core mechanism.

[0008] The valve body mechanism is provided with an inlet, an outlet, and a vent, and the interior of the valve body mechanism is formed by a valve hole that connects the inlet and the outlet.

[0009] The valve core mechanism is slidably mounted in the inner cavity of the valve body mechanism, and the valve core mechanism includes: a core column; a valve core block; and a spring.

[0010] The upper end of the core column receives gas pressure from the vent. The valve core block is fixedly connected to the lower end of the core column, allowing the valve core block to move synchronously with the core column for selectively blocking or opening the valve orifice. The spring is sleeved on the outside of the core column, with one end abutting against the inner wall of the valve body mechanism and the other end acting on the core column. When there is no gas pressure at the vent, the spring pushes the core column to disengage the valve core block from the valve orifice, restoring the valve to its normally open state.

[0011] Preferably, the valve core mechanism further includes a sliding sleeve, which is sleeved on the outer periphery of the core column and forms a sliding fit with the inner cavity of the valve body mechanism. The sliding sleeve provides precise guidance for the reciprocating motion of the core column and can effectively prevent deflection during the motion.

[0012] Preferably, the outer periphery of the sliding sleeve is provided with an annular groove, and the valve core mechanism further includes a first sealing ring installed in the annular groove. The first sealing ring forms a dynamic seal with the inner cavity of the valve body mechanism to prevent fluid leakage when the core column slides.

[0013] Preferably, the valve core mechanism further includes a second sealing ring, which is installed on the outer peripheral sidewall of the valve core block and is used to form a reliable static seal with the inner wall of the valve body mechanism when the valve core block blocks the valve hole.

[0014] Preferably, the normally open miniature pneumatic valve further includes an end cap, which is detachably fixed to the bottom of the valve body mechanism by screws. This detachable connection method facilitates the assembly and maintenance of the valve core mechanism.

[0015] Preferably, a sealing gasket is provided between the mating surfaces of the end cap and the valve body mechanism. The sealing gasket is compressed when the end cap is tightened by the screw, thereby enhancing the sealing effect at the bottom of the valve body mechanism.

[0016] Preferably, the valve core mechanism further includes a retaining block, which is fixed to the core column. The retaining block is used to limit the axial displacement range of the core column by abutting against the inner wall of the valve body mechanism, so as to prevent it from moving too far.

[0017] Preferably, the spring is a compression spring, with one end abutting against the inner wall of the valve body mechanism and the other end abutting against the radially extending flange on the core column. This compression structure enables the spring to provide a stable restoring thrust after being compressed.

[0018] Preferably, the valve body mechanism is an integral housing, and the water inlet, the water outlet and the vent are respectively opened on different side walls of the integral housing. The integral structure enhances the overall strength and pressure resistance of the valve body mechanism.

[0019] This utility model has the following beneficial effects: 1. This utility model, by setting a valve body mechanism and integrating the core column, valve core block and spring into a valve core mechanism that can be slidably installed in the valve body mechanism, uses gas pressure to directly drive the core column to overcome the spring force to close the valve, which solves the problem of complex structure and numerous parts in some normally open valves in the prior art, and achieves the technical effect of compact structure, direct action and rapid response.

[0020] 2. This utility model achieves dynamic sealing by setting a first sealing ring on the sliding sleeve and static sealing of the valve hole by setting a second sealing ring on the valve core block. It also works with the end cover and sealing gasket to seal the bottom of the valve body mechanism. This solves the problem of leakage or sealing failure caused by poor sealing structure in the valve in the prior art, and achieves the technical effect of multiple sealing, dynamic and static combination, high sealing performance and high reliability.

[0021] 3. This utility model guides the reciprocating motion of the valve core by setting a sliding sleeve and restricting its movement stroke by setting a locking block. At the same time, it uses the active elastic force of the spring to push the valve core to reset. This solves the problems of easy jamming, deflection, or incomplete reset due to pressure residue or friction in the prior art. It achieves the technical effects of smooth movement, accurate guidance, rapid reset, and clear status. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a normally open miniature pneumatic valve proposed in this utility model; Figure 2 This is a schematic diagram of the valve body mechanism of a normally open miniature pneumatic valve proposed in this utility model. Figure 3 This is a schematic diagram of the valve core mechanism of a normally open miniature pneumatic valve proposed in this utility model.

[0023] Legend: 1. Valve body mechanism; 101. Housing; 102. Inlet; 103. Outlet; 104. Vent; 2. End cap; 3. Valve core mechanism; 301. Core column; 302. Sliding sleeve; 303. First sealing ring; 304. Spring; 305. Valve core block; 306. Valve hole; 307. Second sealing ring; 308. Locking block; 4. Screw; 5. Sealing gasket. Detailed Implementation

[0024] Please refer to Figures 1 to 3 This utility model provides a normally open miniature pneumatic valve, which aims to solve the problems of complex structure, incomplete reset or sealing failure of normally open pneumatic valves in the prior art.

[0025] like Figures 1 to 3 As shown, the normally open miniature pneumatic valve includes a valve body mechanism 1 and a valve core mechanism 3 that is slidably installed in the inner cavity of the valve body mechanism 1.

[0026] As the basic load-bearing component of the valve, the valve body mechanism 1 is preferably an integral housing 101. The inlet 102, outlet 103 and vent 104 are respectively opened on different side walls of the integral housing 101, and the valve body mechanism 1 has a through valve hole 306 that connects the inlet 102 and the outlet 103.

[0027] The valve core mechanism 3 is the main moving component for opening and closing the valve. It is slidably installed in the inner cavity of the valve body mechanism 1. The valve core mechanism 3 includes a core column 301, a valve core block 305 fixedly connected to the lower end of the core column 301, and a spring 304 sleeved on the outside of the core column 301. The upper end of the core column 301 is used to receive gas pressure from the vent 104. Under the action of gas pressure, the core column 301 moves downward. The valve core block 305 moves synchronously with the core column 301 to selectively block or open the valve hole 306. The spring 304 is a compression spring. One end of the spring abuts against the inner wall of the valve body mechanism 1, and the other end acts on the core column 301. Specifically, the other end of the spring 304 abuts against a radially extending flange on the core column 301. Spring 304 is used to release elastic force to push core column 301 upward reset when there is no gas pressure in vent 104, and drive valve core block 305 to disengage from valve hole 306, so that valve remains in open state.

[0028] To further ensure the stability of the reciprocating motion of the core column 301 and provide a reliable seal, the valve core mechanism 3 also includes a sliding sleeve 302, which is sleeved on the outer periphery of the core column 301 and forms a sliding fit with the inner cavity of the valve body mechanism 1. This structure provides precise guidance for the reciprocating motion of the core column 301 and prevents it from deflecting or getting stuck during the motion.

[0029] Please refer to the following carefully. Figure 3 The sealing structure will be described in detail below: To achieve dynamic sealing, the outer periphery of the sliding sleeve 302 is provided with an annular groove, and the valve core mechanism 3 also includes a first sealing ring 303 installed in the annular groove. The first sealing ring 303 is tightly fitted with the inner wall of the inner cavity of the valve body mechanism 1 to form a dynamic seal, which is used to prevent fluid from leaking upward during the sliding of the core column 301.

[0030] Meanwhile, in order to achieve static sealing when the valve is closed, the valve core mechanism 3 also includes a second sealing ring 307. The second sealing ring 307 is installed on the outer peripheral side wall of the valve core block 305. When the valve core block 305 moves downward to block the valve hole 306, the second sealing ring 307 is pressed against the inner wall of the valve body mechanism 1 to form a reliable static seal and cut off the working flow channel.

[0031] The combination of the first sealing ring 303 and the second sealing ring 307 ensures that the valve has excellent sealing performance under both dynamic operation and static closure conditions.

[0032] Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, please refer to Figure 1 The normally open miniature pneumatic valve also includes an end cap 2, which is detachably fixed to the bottom of the valve body mechanism 1 by screws 4. This detachable connection facilitates the installation, maintenance or replacement of the valve core mechanism 3.

[0033] As a further preferred embodiment of the above-described method, to enhance the sealing performance at the bottom of the valve, please refer to... Figure 1 A sealing gasket 5 is also provided between the mating surfaces of the end cap 2 and the valve body mechanism 1. The sealing gasket 5 is squeezed and deformed when the end cap 2 is locked by the screw 4, filling the gap between the mating surfaces and effectively preventing fluid leakage from the bottom.

[0034] As another preferred embodiment, please refer to Figure 3 To prevent the valve core mechanism 3 from moving too much, the valve core mechanism 3 also includes a locking block 308, which is fixed to the core column 301. The locking block 308 is used to precisely limit the axial displacement range of the core column 301 by abutting against the inner wall of the valve body mechanism 1, so as to ensure that it works stably within the preset stroke.

[0035] In the initial working state, no compressed air is introduced into the vent 104, the spring 304 is in a naturally extended state, and the elastic force of the spring 304 pushes the core column 301, so that the core column 301 and the valve core block 305 fixedly connected to its lower end are in the upper position. At this time, the valve core block 305 is disengaged from the valve hole 306, the valve hole 306 remains unobstructed, the fluid flows in from the inlet 102, passes through the inside of the valve body mechanism 1, passes through the valve hole 306, and finally flows out from the outlet 103. The valve is in the normally open mode. When the valve needs to be closed, compressed air is introduced through the vent 104. The gas pressure acts on the upper end of the core column 301, generating a downward thrust. This thrust overcomes the elastic force of the spring 304 and pushes the core column 301 downward. Under the guidance of the sliding sleeve 302, the core column 301 moves downward smoothly and compresses the spring 304. The core column 301 drives the valve core block 305 to move downward synchronously. As the core column 301 moves downward, the valve core block 305 gradually approaches and eventually blocks the valve hole 306, cutting off the fluid passage and closing the valve. During this process, the first sealing ring 303 installed on the sliding sleeve 302 forms a dynamic seal between the sliding sleeve 302 and the inner wall of the valve body mechanism 1. The second sealing ring 307 installed on the outer peripheral side wall of the valve core block 305 forms a static seal with the inner wall of the valve body mechanism 1 when the valve core block 305 blocks the valve hole 306, together preventing fluid leakage. The end cap 2, screw 4 and sealing gasket 5 fixedly connected to the bottom of the valve body mechanism 1 ensure the overall sealing of the bottom of the valve. The locking block 308 fixed on the core column 301 abuts against the inner wall of the valve body mechanism 1, limiting the downward displacement range of the core column 301. When the supply of compressed air to the vent 104 is stopped, the gas pressure at the upper end of the core column 301 disappears, the compressed spring 304 releases its elastic force, and pushes the core column 301 upward to reset until the locking block 308 abuts against the inner wall of the valve body mechanism 1. The core column 301 drives the valve core block 305 to disengage from the valve hole 306, the valve hole 306 is restored to unobstructed flow, the valve reopens, and returns to the normally open state.

Claims

1. A normally open miniature pneumatic valve, comprising: The valve body mechanism (1) is provided with an inlet (102), an outlet (103) and a vent (104), and the valve body mechanism (1) has a valve hole (306) that connects the inlet (102) and the outlet (103) through the interior. Valve core mechanism (3), which is slidably installed in the inner cavity of valve body mechanism (1); The valve core mechanism (3) is characterized in that it includes a core column (301), the upper end of which is used to receive gas pressure from the vent (104); A valve core block (305), fixedly connected to the lower end of the core column (301), is used to selectively block or open the valve orifice (306); and A spring (304) is sleeved on the outside of the core column (301). One end of the spring (304) abuts against the inner wall of the valve body mechanism (1), and the other end acts on the core column (301). When there is no gas pressure in the vent (104), the spring (304) pushes the core column (301) to drive the valve core block (305) to disengage from the valve hole (306).

2. The normally open miniature pneumatic valve according to claim 1, characterized in that, The valve core mechanism (3) also includes a sliding sleeve (302), which is sleeved on the outer periphery of the core column (301) and slides in cooperation with the inner cavity of the valve body mechanism (1) to guide the reciprocating motion of the core column (301).

3. A normally open miniature pneumatic valve according to claim 2, characterized in that, The outer periphery of the sliding sleeve (302) is provided with an annular groove, and the valve core mechanism (3) further includes a first sealing ring (303) installed in the annular groove. The first sealing ring (303) forms a dynamic seal with the inner cavity of the valve body mechanism (1).

4. A normally open miniature pneumatic valve according to claim 1, characterized in that, The valve core mechanism (3) further includes a second sealing ring (307), which is installed on the outer peripheral side wall of the valve core block (305) and is used to form a static seal with the inner wall of the valve body mechanism (1) when the valve core block (305) blocks the valve hole (306).

5. A normally open miniature pneumatic valve according to claim 1, characterized in that, It also includes an end cap (2), which is detachably fixed to the bottom of the valve body mechanism (1) by screws (4).

6. A normally open miniature pneumatic valve according to claim 5, characterized in that, A sealing gasket (5) is provided between the mating surfaces of the end cap (2) and the valve body mechanism (1).

7. A normally open miniature pneumatic valve according to claim 1, characterized in that, The valve core mechanism (3) further includes a locking block (308), which is fixed on the core column (301). The locking block (308) is used to limit the axial displacement range of the core column (301) by abutting against the inner wall of the valve body mechanism (1).

8. A normally open miniature pneumatic valve according to claim 1, characterized in that, One end of the spring (304) abuts against the inner wall of the valve body mechanism (1), and the other end abuts against the radially extending flange on the core column (301).

9. A normally open miniature pneumatic valve according to claim 1, characterized in that, The valve body mechanism (1) is an integral housing (101), and the inlet (102), outlet (103) and vent (104) are respectively opened on different side walls of the integral housing (101).

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