High-stability two-position three-way coaxial stop type reversing valve

Abstract

The high-stability two-position three-way coaxial cut-off type pneumatic control reversing valve comprises a valve body assembly, a valve body inner cavity is formed in the valve body assembly, an air inlet, an output port and an exhaust port are formed in the valve body assembly, the air inlet, the output port and the exhaust port are communicated through the valve body assembly inner cavity, a valve rod cavity is formed in the middle of the valve body inner cavity, and a valve rod is arranged in the valve rod cavity in a sliding mode; an exhaust cavity and an air inlet cavity are respectively formed in the upper and lower parts of the valve rod cavity; a pneumatic control cover is mounted at the top of the exhaust cavity; a pneumatic control opening is formed in the pneumatic control cover; and the middle part of the exhaust cavity is communicated with the exhaust port. The balance piston is additionally arranged, so that the main valve piston can be opened with low pressure in a limited space; the sealing element is made of a rubber material, such as low-temperature-resistant nitrile rubber or low-temperature-resistant fluorosilicone rubber, so that the valve can work under the condition of minus 40 DEG C to minus 60 DEG C; the anti-sticking film is coated in the valve, so that the valve is prevented from sticking and being stuck under the condition that the working state of the valve is not switched for a long time (several months or more than one year).

Description

Technical Field

[0001] The invention belongs to the technical field of pneumatic reversing valves and relates to a two-position three-way coaxial cut-off reversing valve with high stability. Background Art

[0002] The two-position three-way stop-type pneumatic reversing valve is a pneumatic element that can be used to control the opening or closing of pipeline valves.

[0003] The existing two-position three-way stop-type pneumatic reversing valve has poor low-temperature resistance, high air control pressure, and does not switch direction in a certain working state for a long time, which is prone to adhesion and jamming. Summary of the invention

[0004] The object of the present invention is to provide a two-position three-way coaxial cut-off reversing valve with high stability, which can solve the above-mentioned problems.

[0005] According to the technical solution provided by the present invention: a high-stability two-position three-way coaxial, stop-type reversing valve includes an air-controlled valve body assembly, a valve body cavity is provided in the air-controlled valve body assembly, an air inlet, an outlet and an exhaust port are provided on the air-controlled valve body, the middle of the valve body cavity is a valve stem cavity, a valve stem is slidably provided in the valve stem cavity; the upper and lower parts of the valve stem cavity are respectively an exhaust cavity and an air inlet cavity; an air-controlled cover is installed on the top of the exhaust cavity, and an air-controlled port is provided in the air-controlled cover; the upper part of the exhaust cavity is a piston cavity, the middle part of the exhaust cavity is connected to the exhaust port, the bottom end of the exhaust cavity is an exhaust valve port, and the exhaust valve port is located between the outlet and the exhaust port; the main valve piston is installed on the upper part of the valve stem The upper part of the main valve piston is the upper sealing ring part, and the upper sealing ring part is sleeved with a guide sleeve and a main valve piston sealing ring, the guide sleeve and the main valve piston sealing ring are in contact with the inner wall of the piston cavity, and an upper sealing plug is installed at the bottom of the main valve piston, the top of the intake cavity is the intake valve port, the intake valve port is located between the intake port and the output port, the middle of the intake cavity is connected to the intake port, and the main valve bottom cover is installed at the bottom of the intake cavity; the lower sealing plug and the balancing piston are installed at the lower part of the valve stem; a balancing sealing ring is provided between the main valve bottom cover and the balancing piston; a bottom cover hole vertically runs through the bottom cover of the main valve, the balancing piston slides in the bottom cover hole, and a balancing sealing ring is sleeved on the outer periphery of the balancing piston.

[0006] As a further improvement of the present invention, an upper positioning sleeve is installed on the upper part of the valve stem, a main valve piston is sleeved on the upper positioning sleeve, and a nut is threadedly connected to the top end of the valve stem.

[0007] As a further improvement of the present invention, a lower positioning sleeve is installed at the lower part of the valve stem, a lower sealing pad is sleeved on the lower positioning sleeve, and the bottom end of the valve stem is threadedly connected to a lower nut.

[0008] As a further improvement of the present invention, sealing components such as the balancing seal ring, the interlayer seal ring, the lower sealing pad, the upper sealing pad, the main valve piston seal ring, etc. are made of rubber material.

[0009] As a further improvement of the present invention, the inner wall of the piston cavity and the outer periphery of the upper sealing ring, the bottom of the upper sealing pad and the top of the exhaust valve port 1-6, the top of the lower sealing pad and the bottom of the intake valve port 1-7, the inner wall of the bottom cover hole and the outer periphery of the balance piston are all coated with an anti-sticking film.

[0010] As a further improvement of the present invention, an interlayer sealing ring is provided between the balancing piston and the lower sealing pad.

[0011] As a further improvement of the present invention, a valve core return spring is provided between the lower sealing pad and the bottom cover of the main valve.

[0012] The positive effects of this application are: 1. The present invention can open the main valve piston with a relatively low pressure in a limited space by adding a balance piston.

[0013] 2. The sealing member of the present invention is made of rubber material, such as low-temperature resistant nitrile rubber or low-temperature resistant fluorosilicone rubber, which can ensure that the valve can work under the condition of -40°C to 60°C.

[0014] 3. The anti-sticking film is applied in the present invention to prevent the valve from sticking and getting stuck under severe weather conditions or when the working state is not switched for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the present invention.

[0016] Figure 2 It is a rotational cross-sectional view of the present invention.

[0017] Figure 3 It is a rotational cross-sectional view of the valve body assembly of the present invention.

[0018] Figure 4 It is a front surface view of the valve body of the present invention.

[0019] Figure 5 It is a cross-sectional view of the main valve core of the present invention.

[0020] Figure 1-Figure 5 It includes a valve body 1, a main valve bottom cover 2, a lower nut 3, a balance piston 4, a balance sealing ring 5, a valve core return spring 6, a barrier sealing ring 7, a lower positioning sleeve 8, a lower sealing plug gasket 9, a valve stem 11, an upper sealing plug gasket 13, an upper positioning sleeve 14, a guide sleeve 15, a main valve piston sealing ring 16, an air control cover 17, a main valve piston 18, etc. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed may also be "included" and "having"; for example, a process, method, system, product or device that may include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text expression.

[0025] like Figure 1-Figure 2 As shown, the present invention is a high-stability two-position three-way coaxial, stop-type reversing valve, comprising a valve body 1, a valve body cavity is provided in the valve body 1, an air inlet 1-1, an outlet 1-2, and an exhaust port 1-3 are opened on the valve body 1, the middle part of the valve body cavity is a valve stem cavity, and a valve stem 11 is slidably provided in the valve stem cavity.

[0026] The upper and lower parts of the valve stem cavity are exhaust cavity 1-4 and intake cavity 1-5 respectively. The top of the exhaust cavity 1-4 is installed with an air control cover 17, and an air control port 17-1 is opened in the air control cover 17; the upper part of the exhaust cavity 1-4 is a piston cavity, the middle part of the exhaust cavity 1-4 is connected with the exhaust port 1-3, and the bottom end of the exhaust cavity 1-4 is an exhaust valve port 1-6. Figure 3 As shown, the exhaust valve port is located between the output port 1-2 and the exhaust port 1-3. The main valve piston 18 is installed on the upper part of the valve stem 11. The upper part of the main valve piston 18 is the upper sealing ring part. The guide sleeve 15 and the main valve piston sealing ring 16 are sleeved on the upper sealing ring part. The guide sleeve 15 and the main valve piston sealing ring 16 are in contact with the inner wall of the piston cavity. The guide sleeve 15 ensures that the main valve piston 18 moves smoothly, and the main valve piston sealing ring 16 ensures that the top of the exhaust cavity 1-4 is sealed. The upper sealing pad 13 is installed at the bottom of the main valve piston 18.

[0027] Specifically, an upper positioning sleeve 14 is installed on the upper part of the valve stem 11 , a main valve piston 18 is sleeved on the upper positioning sleeve 14 , and an upper nut is threadedly connected to the top end of the valve stem 11 ; the upper nut fixes the main valve piston 18 .

[0028] like Figure 3 As shown, the top of the air inlet cavity 1-5 is the air inlet valve port 1-7, the air inlet valve port 1-7 is located between the air inlet port 1-1 and the outlet port 1-2, the middle of the air inlet cavity 1-5 is connected to the air inlet port 1-1, the bottom of the air inlet cavity 1-5 is installed with the main valve bottom cover 2; the lower sealing gasket 9 and the balance piston 4 are installed at the lower part of the valve stem 11. A balance seal ring 5 is provided between the main valve bottom cover 2 and the balance piston 4.

[0029] Specifically, the lower positioning sleeve 8 is installed at the lower part of the valve stem 11, and the lower sealing pad 9 is sleeved on the lower positioning sleeve 8. The lower end of the valve stem 11 is threadedly connected to the lower nut 3; the lower nut 3 tightly fits the balancing piston 4 and the lower sealing pad 9. In order to further enhance the sealing performance between the balancing piston 4 and the lower sealing pad 9, an interlayer sealing ring 7 is provided between the balancing piston 4 and the lower sealing pad 9. A balancing piston chamber 2-1 is provided in the middle of the main valve bottom cover 2, and the balancing piston chamber 2-1 is connected to the air inlet chamber 1-5. The balancing piston 4 slides in the balancing piston chamber 2-1, and the balancing sealing ring 5 is sleeved on the outer periphery of the balancing piston 4.

[0030] like Figure 5 The main valve core assembly 30-1 is composed of an upper nut, a lower nut 3, a balance piston 4, a balance seal 5, a barrier seal 7, a positioning sleeve 8, a lower sealing pad 9, a valve stem 11, an upper sealing pad 13, a guide sleeve 15, a main valve piston seal 16, and a main valve piston 18. The upper nut and the lower nut 3 are fixed together according to the above requirements to form the main valve core assembly 30-1.

[0031] In order to improve the response speed of the main valve core assembly 30 - 1 , a valve core reset spring 6 is provided between the lower sealing pad 9 and the main valve bottom cover 2 , and the upper and lower ends of the valve core reset spring 6 respectively abut against the lower sealing pad 9 and the main valve bottom cover 2 .

[0032] like Figure 3 As shown, the valve body 1 is composed of a main valve body 1-10 and a muffler seat 1-30 connected together. The right end face of the main valve body 1-10 is tightly attached to the left end face of the muffler seat 1-30 and is fastened with no less than two sets of screws 1-40 and spring washers 1-50. At the same time, a special-shaped ring groove 1-9 is opened on the right end face of the main valve body 1-10, and a special-shaped ring groove 1-20 is placed in the special-shaped ring groove 1-9. An exhaust port 1-3 is opened at the upper right end of the muffler seat 1-30. The purpose of using a special-shaped structure of the special-shaped ring groove 1-9 and the special-shaped ring groove 1-20 is to avoid interference between components and sealing between channels.

[0033] The sealing parts such as the balance seal ring 5, the interlayer seal ring 7, the lower sealing pad 9, the upper sealing pad 13, the main valve piston seal ring 16 are made of low-temperature resistant and oil-resistant rubber materials, such as low-temperature resistant nitrile rubber or low-temperature resistant fluorosilicone rubber, which can ensure that the valve can work under the condition of -40℃--60℃. In addition, the upper sealing pad 13 is low-temperature resistant rubber, and its Shore hardness is 10 º higher than that of the lower sealing pad 9.

[0034] Figure 1 The cross-sectional area of ​​the balance piston chamber 2-1 is smaller than the cross-sectional areas of the exhaust valve port 1-6 and the intake valve port 1-7, and the cross-sectional areas of the exhaust valve port 1-6 and the intake valve port 1-7 are the same.

[0035] The inner wall of the piston cavity and the outer periphery of the upper sealing ring, the bottom of the upper sealing pad 13 and the top of the exhaust valve port 1-6, the top of the lower sealing pad 9 and the bottom of the intake valve port 1-7, the inner wall of the bottom cover hole and the outer periphery of the balance piston 4 are all coated with an anti-sticking film 19.

[0036] The formula of the anti-adhesive film 19 is 15% polytetrafluoroethylene, 3% tungsten disulfide, 15% acrylic acid, 15% organic cosolvent, 3% propylene glycol methyl ether ester (curing agent), 2% ethylene glycol butyl ester, 3% light naphtha, and water.

[0037] Acrylic acid, organic cosolvent, propylene glycol methyl ether ester (curing agent), ethylene glycol butyl ester and light naphtha in the formula of anti-stick film 19 are the base film materials of the anti-stick film, and its main function is to firmly bond the anti-stick film to the surface of the object to be anti-sticked. The anti-stick property of the base film is greatly improved by uniformly and firmly mixing polytetrafluoroethylene film in the base film. In addition, tungsten disulfide is uniformly and firmly mixed in the base film to greatly improve the hardness, anti-stickiness and microscopic adhesion self-repairing ability of the anti-stick film surface.

[0038] The coating process of the anti-stick film 19 is as follows: 1. The surface of the air-controlled valve body 1 and the main valve bottom cover 2 is anodized (clean the surface and form a micro-concave surface); 2. The anti-stick coating is evenly applied on the surface to be anti-stick, the coating thickness is 15-30um, and the bonding strength between the coating and the substrate surface conforms to the requirements of Level 0 in Table 1 of GB / T929286-2021; 3. Clean the surface of the rubber parts with aqueous degreasing solvent, degrease and dehydrate with anhydrous ethanol after degreasing, dry for 1 hour, and dry to 50°. Apply the anti-stick film 19 evenly on the rubber surface to be anti-stick, and dry at 50° for 1 hour.

[0039] The working process of the present invention is as follows: When the air control port 17-1 is in a pressure-free state, the valve core reset spring 6 is on the lower sealing pad 9 and lifts up the main valve core assembly 30-1, opening the exhaust valve port 1-6, and the lower sealing pad 9 is close to the intake valve port, closing the intake valve port 1-7, and the output port 1-2 is connected with the exhaust port 1-3; the intake port 1-1 and the output port 1-2 are separated.

[0040] When the air control port 17-1 is in a pressure state, the main valve core assembly 30-1 overcomes the elastic force of the valve core return spring 6 and the differential pressure due to the difference between the intake valve port 1-7 and the balance piston chamber 2-1 and moves downward, and the upper sealing gasket 13 is close to the exhaust valve port 1-6, that is, the exhaust valve port is closed, and the output port 1-2 is separated from the exhaust port 1-3; the lower sealing gasket 9 is separated from the intake valve port 1-7, that is, the intake valve port 1-7 is opened, and the intake port 1-1 and the output port 1-2 are connected.

[0041] The cross-sectional area of ​​the balance piston chamber 2-1 is smaller than that of the exhaust valve port 1-6 and the intake valve port 1-7, thereby reducing the force exerted by the pressure of the compressed air from the intake port 1-1 on the lower sealing gasket 9 in the main valve core assembly 30-1. The required air control pressure of the air control port 17-1 is also reduced accordingly. In a limited space, the intake valve port can be opened and the exhaust valve port can be closed with a lower pressure.

[0042] In addition, since a balancing piston is used to reduce the force of the compressed air pressure from the air inlet 1-1 on the lower sealing gasket 9 in the main valve core assembly 30-1, the stress on the upper sealing gasket 13 in the main valve core assembly 30-1 during sealing is greatly increased, and its life is also greatly reduced. The life of the upper sealing gasket 13 is also increased. The Shore hardness of the rubber of the upper sealing gasket 13 is 10 degrees higher than that of the lower sealing gasket 9.

[0043] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements (adding a pilot solenoid valve to change the air-controlled valve into an electric-controlled valve, etc.) are also considered to be within the protection scope of the present invention.

Claims

1. A two-position three-way coaxial stop-type reversing valve with high stability, comprising a valve body assembly (1), wherein a valve body cavity is provided in the valve body assembly (1), and an air inlet (1-1), an outlet (1-2), and an exhaust port (1-3) are provided on the valve body assembly (1); the middle of the air inlet (1-1), the outlet (1-2), and the exhaust port (1-3) of the valve body assembly cavity is a valve stem cavity, and a valve stem (11) is slidably provided in the valve stem cavity; the upper and lower parts of the valve stem cavity are respectively an exhaust cavity (1-4) and an air inlet cavity (1-5); an air control cover (17) is installed on the top of the exhaust cavity (1-4), and an air control port (17-1) is provided in the air control cover (17); The upper part of the exhaust chamber (1-4) is an upper piston chamber, the middle part of the exhaust chamber (1-4) is connected to the exhaust port (1-3), the bottom end of the exhaust chamber (1-4) is an upper valve port 1-6, and the upper valve port 1-6 is located between the output port (1-2) and the exhaust port (1-3); the main valve piston (18) is installed on the upper part of the valve stem (11), the upper part of the main valve piston (18) is an upper sealing ring part, a guide sleeve (15) and a main valve piston sealing ring (16) are sleeved on the upper sealing ring part, the guide sleeve (15) and the main valve piston sealing ring (16) are in contact with the inner wall of the piston chamber, and an upper sealing pad (13) is installed on the bottom of the main valve piston (18), characterized in that: The top of the air inlet chamber (1-5) is a lower valve port 1-7, and the lower valve port 1-7 is located between the air inlet port (1-1) and the outlet port (1-2). The middle of the air inlet chamber (1-5) is connected to the air inlet port (1-1), and the bottom of the air inlet chamber (1-5) is installed with a main valve bottom cover (2); the lower part of the valve stem (11) is installed with a lower sealing gasket (9) and a balancing piston (4); a balancing sealing ring (5) is provided between the main valve bottom cover (2) and the balancing piston (4); a bottom cover hole vertically penetrates the main valve bottom cover (2), the balancing piston (4) slides in the bottom cover hole, and the balancing sealing ring (5) is sleeved on the outer periphery of the balancing piston (4).

2. The high-stability two-position three-way coaxial, stop-type directional control valve according to claim 1, characterized in that: An upper positioning sleeve (14) is installed on the upper part of the valve stem (11), a main valve piston (18) is sleeved on the upper positioning sleeve (14), and a nut is threadedly connected to the top end of the valve stem (11).

3. The high-stability two-position three-way coaxial, stop-type directional control valve according to claim 1, characterized in that: A lower positioning sleeve (8) is installed at the lower part of the valve stem (11), a lower sealing gasket (9) is sleeved on the upper part of the lower positioning sleeve (8), and the bottom end of the valve stem (11) is threadedly connected to a lower nut (3).

4. The high-stability two-position three-way coaxial, stop-type reversing valve according to claim 1, characterized in that: The sealing components such as the balancing seal ring (5), the interlayer seal ring (7), the lower sealing pad (9), the upper sealing pad (13), the main valve piston seal ring (16) are made of rubber material.

5. The high-stability two-position three-way coaxial, stop-type directional control valve according to claim 1, characterized in that: The inner wall of the piston cavity and the outer periphery of the upper sealing ring, the bottom of the upper sealing pad (13) and the top of the exhaust valve port 1-6, the top of the lower sealing pad (9) and the bottom of the intake valve port 1-7, the inner wall of the bottom cover hole and the outer periphery of the balance piston (4) are all coated with an anti-sticking film (19).

6. The high-stability two-position three-way coaxial cut-off directional control valve according to claim 1, characterized in that: An interlayer sealing ring (7) is provided between the balancing piston (4) and the lower sealing gasket (9).

7. The high stability two-position three-way coaxial cut-off directional control valve according to claim 1, characterized in that: A valve core return spring (6) is provided between the lower sealing gasket (9) and the main valve bottom cover (2).

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