Pneumatic three-way valve

Abstract

The utility model relates to a pneumatic three-way valve which comprises a plastic valve body, a metal valve core, an upper cavity sealing gasket and a lower cavity sealing gasket, the plastic valve body is provided with an upper cavity, a lower cavity, a first liquid inlet flow channel, a second liquid inlet flow channel, a first liquid outlet flow channel and a second liquid outlet flow channel, the second liquid inlet runner is transversely arranged and communicates the first liquid inlet runner with the outside of the side wall of the plastic valve body; the upper cavity is located on the upper portion of the plastic valve body and communicates with the upper end of the first liquid inlet flow channel. The lower cavity is located on the lower portion of the plastic valve body and communicates with the lower end of the second liquid inlet flow channel. An upper cavity sealing gasket is arranged in the upper cavity, a lower cavity sealing gasket is arranged in the lower cavity, the peripheral side edge of the upper cavity sealing gasket is in sealed sliding connection with the peripheral side wall of the upper cavity, and the peripheral side edge of the lower cavity sealing gasket is in sealed sliding connection with the peripheral side wall of the lower cavity; a metal valve element is arranged in the first liquid inlet flow channel, the upper end of the metal valve element is connected with the upper cavity sealing gasket, and the lower end of the metal valve element is connected with the lower cavity sealing gasket.

Description

Technical Field

[0001] The utility model relates to the technical field related to cut-off control valves used in water and gas conveying pipelines of industrial production lines, and in particular to a pneumatic three-way valve. Background Art

[0002] Existing liquid and gas switch pneumatic control valves such as ball valves, butterfly valves, gate valves, angle seat valves and other metal valves are already very mature. They are generally large in size. When controlling small flow rates of liquids and gases, they occupy a large space and have high maintenance costs. Utility Model Content

[0003] In order to solve one or more technical problems existing in the prior art, the utility model provides a pneumatic three-way valve.

[0004] The utility model solves the above technical problems with the following technical solutions: a pneumatic three-way valve, comprising a plastic valve body, a metal valve core, an upper chamber sealing gasket and a lower chamber sealing gasket, wherein the plastic valve body is provided with an upper chamber, a lower chamber, a first liquid inlet flow channel, a second liquid inlet flow channel, a first liquid outlet flow channel and a second liquid outlet flow channel, wherein the first liquid inlet flow channel is located in the middle of the plastic valve body and is connected vertically, and the second liquid inlet flow channel is arranged transversely and connects the first liquid inlet flow channel with the outside of the side wall of the plastic valve body; the upper chamber is located in the upper part of the plastic valve body and is connected with the upper end of the first liquid inlet flow channel, and the lower chamber is located in the lower part of the plastic valve body and is connected with the lower end of the first liquid inlet flow channel; the first liquid outlet flow channel connects the upper chamber with the outside of the side wall of the plastic valve body, and the second liquid outlet flow channel connects the lower chamber with the outside of the side wall of the plastic valve body;

[0005] An upper chamber sealing gasket is provided in the upper chamber, and a lower chamber sealing gasket is provided in the lower chamber. The circumferential side edges of the upper chamber sealing gasket are sealingly and slidingly connected to the circumferential side walls of the upper chamber, and the circumferential side edges of the lower chamber sealing gasket are sealingly and slidingly connected to the circumferential side walls of the lower chamber; a metal valve core is provided in the first liquid inlet channel, the upper end of the metal valve core is connected to the upper chamber sealing gasket, and the lower end of the metal valve core is connected to the lower chamber sealing gasket; the upper chamber sealing gasket can connect or isolate the first liquid outlet channel from the upper chamber, and the lower chamber sealing gasket can connect or isolate the second liquid outlet channel from the lower chamber.

[0006] The beneficial effects of the utility model are as follows: the pneumatic three-way valve of the utility model, by providing an upper chamber, a lower chamber, an upper chamber sealing gasket and a lower chamber sealing gasket, can open the first liquid outlet flow channel or the second liquid outlet flow channel by moving the upper chamber sealing gasket and the lower chamber sealing gasket up and down, realize the flow direction switching control, and use the sealing gasket to block one end of the first liquid inlet flow channel, and can also be used as a two-way valve. The utility model adopts a structural form combining a plastic valve body and a metal valve core, and has the advantages of low failure rate, high reliability, low manufacturing cost, simple structure, convenient operation, stable control, and low maintenance.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the upper chamber and the lower chamber are both closed structures, and the plastic valve body is also provided with a first air source interface and a second air source interface, the first air source interface is connected to the upper chamber above the upper chamber sealing gasket, and the second air source interface is connected to the lower chamber below the lower chamber sealing gasket.

[0009] The beneficial effect of adopting the above further solution is that by providing a gas source interface, gas can be introduced into the upper and lower chambers to drive the valve core to move up and down, thereby achieving flow direction switching.

[0010] Furthermore, a first groove structure with an open top is formed at the upper end of the plastic valve body, an upper cavity plastic pressure cover is installed at the open portion of the first groove structure, and the upper cavity plastic pressure cover and the first groove structure together form the upper chamber.

[0011] The beneficial effect of adopting the above further solution is that by providing a structure in which the plastic pressure cover cooperates with the groove, disassembly and assembly are facilitated.

[0012] Furthermore, the upper cavity plastic gland is fixedly connected to the upper end surface of the plastic valve body by a plurality of bolts.

[0013] Furthermore, a second groove structure with an open bottom is formed at the lower end of the plastic valve body, a lower cavity plastic pressure cover is installed at the open portion of the second groove structure, and the lower cavity plastic pressure cover and the second groove structure together form the lower chamber.

[0014] Furthermore, the lower cavity plastic gland is fixedly connected to the lower end surface of the plastic valve body by a plurality of bolts.

[0015] Furthermore, the metal valve core includes a valve stem, an upper mounting platform and a lower mounting platform, the valve stem is coaxially arranged with the first liquid inlet channel, the upper mounting platform is ring-arranged on the upper end circumference of the valve stem, and the lower mounting platform is ring-arranged on the lower end circumference of the valve stem; the upper chamber sealing gasket is sleeved on the upper end of the valve stem and is pressed and fixed on the upper surface of the upper mounting platform, and the lower chamber sealing gasket is sleeved on the lower end of the valve stem and is pressed and fixed on the lower surface of the lower mounting platform.

[0016] The beneficial effect of adopting the above further solution is that by providing a mounting platform, the sealing gasket can be stably assembled on the valve stem.

[0017] Furthermore, an upper nut is threadedly connected to the upper end of the valve stem, and the upper nut presses and fixes the upper cavity sealing gasket on the upper surface of the upper mounting platform.

[0018] Furthermore, a lower nut is threadedly connected to the lower end of the valve stem, and the lower nut presses and fixes the lower cavity sealing gasket on the lower surface of the lower mounting platform.

[0019] Furthermore, the first liquid outlet channel and the second liquid outlet channel are both L-shaped, and the external outlet of the first liquid outlet channel and the external outlet of the second liquid outlet channel face in opposite directions.

[0020] The beneficial effects of adopting the above further solution are: adopting an L-shaped liquid outlet flow channel, the flow channel layout is reasonable, the structure is compact, and the flow direction switching is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the internal structure of the pneumatic three-way valve of the utility model.

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 1. Plastic valve body; 2. Valve stem; 3. Upper chamber sealing gasket; 4. Lower chamber sealing gasket; 5. Upper mounting platform; 6. Lower mounting platform; 7. Upper nut; 8. Lower nut; 9. First liquid inlet channel; 10. Second liquid inlet channel; 11. First liquid outlet channel; 12. Second liquid outlet channel; 13. Upper chamber plastic pressure cover; 14. Lower chamber plastic pressure cover; 15. Upper chamber; 16. Lower chamber. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] like Figure 1As shown, a pneumatic three-way valve of the present embodiment comprises a plastic valve body 1, a metal valve core, an upper chamber sealing gasket 3 and a lower chamber sealing gasket 4, wherein the plastic valve body 1 is provided with an upper chamber 15, a lower chamber 16, a first liquid inlet flow channel 9, a second liquid inlet flow channel 10, a first liquid outlet flow channel 11 and a second liquid outlet flow channel 12, wherein the first liquid inlet flow channel 9 is located in the middle of the plastic valve body 1 and is connected vertically, and the second liquid inlet flow channel 10 is arranged transversely and connects the first liquid inlet flow channel 9 with the outside of the side wall of the plastic valve body 1; the upper chamber 15 is located in the upper part of the plastic valve body 1 and is connected with the upper end of the first liquid inlet flow channel 9, and the lower chamber 16 is located in the lower part of the plastic valve body 1 and is connected with the lower end of the first liquid inlet flow channel 9; the first liquid outlet flow channel 11 connects the upper chamber 15 with the outside of the side wall of the plastic valve body 1, and the second liquid outlet flow channel 12 connects the lower chamber 16 with the outside of the side wall of the plastic valve body 1;

[0026] An upper chamber sealing gasket 3 is provided in the upper chamber 15, and a lower chamber sealing gasket 4 is provided in the lower chamber 16. The circumferential side edges of the upper chamber sealing gasket 3 are sealingly and slidingly connected to the circumferential side walls of the upper chamber 15, and the circumferential side edges of the lower chamber sealing gasket 4 are sealingly and slidingly connected to the circumferential side walls of the lower chamber 16; a metal valve core is provided in the first liquid inlet channel 9, the upper end of the metal valve core is connected to the upper chamber sealing gasket 3, and the lower end of the metal valve core is connected to the lower chamber sealing gasket 4; the upper chamber sealing gasket 3 can connect or disconnect the first liquid outlet channel 11 with the upper chamber 15, and the lower chamber sealing gasket 4 can connect or disconnect the second liquid outlet channel 12 with the lower chamber 16.

[0027] The shape of the plastic valve body 1 of this embodiment can be any shape such as cylinder, cuboid, cube, etc. according to needs.

[0028] like Figure 1 As shown, the upper chamber 15 and the lower chamber 16 of this embodiment are both closed structures, and the plastic valve body 1 is also provided with a first gas source interface and a second gas source interface, the first gas source interface is connected to the upper chamber 15 above the upper chamber sealing gasket 3, and the second gas source interface is connected to the lower chamber 16 below the lower chamber sealing gasket 4. By providing the gas source interface, gas can be introduced into the upper and lower chambers to drive the valve core to move up and down to achieve flow direction switching. The pneumatic three-way valve of this embodiment can be used in explosion-proof places.

[0029] like Figure 1 As shown, a specific solution of this embodiment is that the upper end of the plastic valve body 1 of this embodiment is formed with a first groove structure with an open top, and an upper cavity plastic gland 13 is installed at the open end of the first groove structure, and the upper cavity plastic gland 13 and the first groove structure are surrounded to form the upper chamber 15. By setting a structure in which the plastic gland and the groove cooperate, disassembly and assembly are convenient.

[0030] An optional solution of this embodiment is that the upper cavity plastic pressure cover 13 is fixedly connected to the upper end surface of the plastic valve body 1 by a plurality of bolts. Specifically, any number of bolts such as 3, 4, 5, etc. can be used, and preferably 4 bolts are evenly arranged.

[0031] like Figure 1 As shown, a specific solution of this embodiment is that a second groove structure with an open bottom is formed at the lower end of the plastic valve body 1, and a lower cavity plastic pressure cover 14 is installed at the open portion of the second groove structure, and the lower cavity plastic pressure cover 14 and the second groove structure together form the lower cavity 16.

[0032] Optionally, the lower cavity plastic gland 14 is fixedly connected to the lower end surface of the plastic valve body 1 by a plurality of bolts, and specifically, any number of bolts such as 3, 4, or 5 can be used, preferably 4 bolts evenly arranged. The lower cavity plastic gland 14 and the upper cavity plastic gland 13 can be fixed by the same set of bolts, that is, the bolts can be passed through the plastic valve body 1, the lower cavity plastic gland 14, and the upper cavity plastic gland 13 for connection and fixing.

[0033] Specifically, Figure 1 As shown, the metal valve core of this embodiment includes a valve stem 2, an upper mounting platform 5 and a lower mounting platform 6. The valve stem 2 is coaxially arranged with the first liquid inlet flow channel 9. The upper mounting platform 5 is arranged around the upper end of the valve stem 2, and the lower mounting platform 6 is arranged around the lower end of the valve stem 2. The upper cavity sealing gasket 3 is sleeved on the upper end of the valve stem 2 and is pressed and fixed on the upper surface of the upper mounting platform 5. The lower cavity sealing gasket 4 is sleeved on the lower end of the valve stem 2 and is pressed and fixed on the lower surface of the lower mounting platform 6. By setting the mounting platform, the sealing gasket can be stably assembled on the valve stem. Among them, the upper mounting platform 5 and the lower mounting platform 6 can be integrally processed and formed with the valve stem 2.

[0034] like Figure 1 As shown, the upper end of the valve stem 2 is threadedly connected with an upper nut 7, and the upper nut 7 presses and fixes the upper cavity sealing gasket 3 to the upper surface of the upper mounting platform 5. The lower end of the valve stem 2 is threadedly connected with a lower nut 8, and the lower nut 8 presses and fixes the lower cavity sealing gasket 4 to the lower surface of the lower mounting platform 6.

[0035] A preferred solution of this embodiment is that the first liquid outlet flow channel 11 and the second liquid outlet flow channel 12 are both L-shaped, and the external outlet of the first liquid outlet flow channel 11 is in opposite directions to the external outlet of the second liquid outlet flow channel 12. The L-shaped liquid outlet flow channel has a reasonable flow channel layout, a compact structure, and is convenient for flow direction switching.

[0036] The valve body of this embodiment is made of polymer material, specifically a relatively stable polymer rod made by polymerizing tetrafluoroethylene as a monomer, with a chemical formula of (C2F4) n , with excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance. It can be used for a long time at -180 ~ 200 ℃, non-toxic and odorless. The plastic valve body is a valve body with a height of 50mm and a diameter of φ35 that is machined from a high molecular polytetrafluoroethylene rod with a diameter of φ50. The internal flow channels are connected, and the flow channel surface is smooth and has a self-cleaning function. The metal valve core uses a national standard 316 stainless steel diameter φ10 rod to be processed into a valve core with a height of 40mm and a diameter of φ3.5mm. The upper and lower ends of the metal valve core each have a 5.5mm long M5 thread, and the mounting platforms at both ends of the metal valve core are the mounting bases of the sealing gasket. The upper cavity plastic pressure cover 13 and the lower cavity plastic pressure cover 14 of this embodiment are made of the same material as the plastic valve body 1, and the first gas source interface and the second gas source interface can be respectively set on the upper cavity plastic pressure cover 13 and the lower cavity plastic pressure cover 14. The upper cavity sealing gasket 3 and the lower cavity sealing gasket 4 of this embodiment can be made of nitrile rubber NBR, the ACN content of which is 36%-42%. Nylon cloth is arranged in the middle layer to make a sealing gasket with a diameter of φ28mm, a thickness of 2.3mm and a hole in the middle, which has better tear resistance and compression resistance.

[0037] The pneumatic three-way valve of this embodiment is installed on industrial water and gas pipelines. Compressed air can be introduced into the upper chamber and the lower chamber respectively to move the valve core up and down, thereby driving the upper and lower chamber sealing gaskets to open or close, so that the first liquid outlet channel and the second liquid outlet channel are opened or closed. During normal operation, the lower chamber is introduced with controlled compressed air, the valve core moves up, and the first liquid inlet channel, the second liquid inlet channel, the upper chamber, and the first liquid outlet channel are connected. When the upper chamber is introduced with controlled compressed air, the valve core moves down, and the first liquid inlet channel, the second liquid inlet channel, the lower chamber, and the second liquid outlet channel are connected. The source of the controlled compressed air is provided by the production system, and the pressure range is 0.01-0.8Mpa. In order to ensure reliable action conversion of the valve, it is necessary to note that the control air pressure should be greater than the mainstream pressure of the medium. In the case of a slight negative pressure in the water and gas pipelines, the control is not affected.

[0038] Compared with the prior art, the pneumatic three-way valve of this embodiment can realize automatic flow direction switching control, and the three-way valve can also be used as a two-way valve by simply blocking any one outlet.

[0039] The pneumatic three-way valve of this embodiment, by providing an upper chamber, a lower chamber, an upper chamber sealing gasket and a lower chamber sealing gasket, can open the first liquid outlet flow channel or the second liquid outlet flow channel by moving the upper chamber sealing gasket and the lower chamber sealing gasket up and down, realize flow direction switching control, and use the sealing gasket to block one end of the first liquid inlet flow channel, and can also be used as a two-way valve. The pneumatic three-way valve of this embodiment adopts a structural form combining a plastic valve body and a metal valve core, and has the advantages of low failure rate, high reliability, low manufacturing cost, simple structure, convenient operation, stable control, and low maintenance.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A pneumatic three-way valve, characterized in that: It comprises a plastic valve body, a metal valve core, an upper chamber sealing gasket and a lower chamber sealing gasket, wherein the plastic valve body is provided with an upper chamber, a lower chamber, a first liquid inlet flow channel, a second liquid inlet flow channel, a first liquid outlet flow channel and a second liquid outlet flow channel, wherein the first liquid inlet flow channel is located in the middle of the plastic valve body and is connected from top to bottom, and the second liquid inlet flow channel is arranged transversely and connects the first liquid inlet flow channel with the outside of the side wall of the plastic valve body; the upper chamber is located in the upper part of the plastic valve body and is connected with the upper end of the first liquid inlet flow channel, and the lower chamber is located in the lower part of the plastic valve body and is connected with the lower end of the first liquid inlet flow channel; the first liquid outlet flow channel connects the upper chamber with the outside of the side wall of the plastic valve body, and the second liquid outlet flow channel connects the lower chamber with the outside of the side wall of the plastic valve body; An upper chamber sealing gasket is provided in the upper chamber, and a lower chamber sealing gasket is provided in the lower chamber. The circumferential side edges of the upper chamber sealing gasket are sealingly and slidingly connected to the circumferential side walls of the upper chamber, and the circumferential side edges of the lower chamber sealing gasket are sealingly and slidingly connected to the circumferential side walls of the lower chamber; a metal valve core is provided in the first liquid inlet channel, the upper end of the metal valve core is connected to the upper chamber sealing gasket, and the lower end of the metal valve core is connected to the lower chamber sealing gasket; the upper chamber sealing gasket can connect or isolate the first liquid outlet channel from the upper chamber, and the lower chamber sealing gasket can connect or isolate the second liquid outlet channel from the lower chamber.

2. A pneumatic three-way valve according to claim 1, characterized in that: The upper chamber and the lower chamber are both closed structures. The plastic valve body is also provided with a first air source interface and a second air source interface. The first air source interface is connected to the upper chamber above the upper chamber sealing gasket, and the second air source interface is connected to the lower chamber below the lower chamber sealing gasket.

3. A pneumatic three-way valve according to claim 1, characterized in that: A first groove structure with an open top is formed at the upper end of the plastic valve body, an upper cavity plastic pressure cover is installed at the open portion of the first groove structure, and the upper cavity plastic pressure cover and the first groove structure together form the upper chamber.

4. A pneumatic three-way valve according to claim 3, characterized in that: The upper cavity plastic gland is fixedly connected to the upper end surface of the plastic valve body by a plurality of bolts.

5. The pneumatic three-way valve according to claim 1, characterized in that: A second groove structure with an open bottom is formed at the lower end of the plastic valve body, a lower cavity plastic pressure cover is installed at the open portion of the second groove structure, and the lower cavity plastic pressure cover and the second groove structure are enclosed to form the lower chamber.

6. A pneumatic three-way valve according to claim 5, characterized in that: The lower cavity plastic gland is fixedly connected to the lower end surface of the plastic valve body by a plurality of bolts.

7. A pneumatic three-way valve according to claim 1, characterized in that: The metal valve core includes a valve stem, an upper mounting platform and a lower mounting platform. The valve stem is coaxially arranged with the first liquid inlet channel. The upper mounting platform is ring-arranged on the upper end circumference of the valve stem, and the lower mounting platform is ring-arranged on the lower end circumference of the valve stem. The upper chamber sealing gasket is sleeved on the upper end of the valve stem and is pressed and fixed on the upper surface of the upper mounting platform. The lower chamber sealing gasket is sleeved on the lower end of the valve stem and is pressed and fixed on the lower surface of the lower mounting platform.

8. A pneumatic three-way valve according to claim 7, characterized in that: The upper end of the valve stem is threadedly connected with an upper nut, and the upper nut presses and fixes the upper cavity sealing gasket on the upper surface of the upper mounting platform.

9. A pneumatic three-way valve according to claim 7, characterized in that: The lower end of the valve stem is threadedly connected with a lower nut, and the lower nut presses and fixes the lower cavity sealing gasket on the lower surface of the lower mounting platform.

10. The pneumatic three-way valve according to claim 1, characterized in that: The first liquid outlet flow channel and the second liquid outlet flow channel are both L-shaped, and the external outlet of the first liquid outlet flow channel and the external outlet of the second liquid outlet flow channel are in opposite directions.

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