Manual push-type two-position three-way gas switching valve

Abstract

The present invention discloses a manual push-type two-position three-way gas switching valve, comprising a base, a compression spring, a compression spring limiting cover, a sealing cover, an air path reversing member, an upper cover, an operating rod and a handle, wherein the base is provided with a base inner cavity, the bottom of the base is provided with an air inlet, the bottom or side wall of the base is provided with a first air outlet and a second air outlet, the bottom of the base inner cavity is provided with a compression spring mounting hole, the upper section of the compression spring is placed in the cylinder of the compression spring limiting cover and the lower part of the cylinder is placed in the compression spring mounting hole, the sealing cover is placed above the compression spring limiting cover and connected to the lower end of the operating rod, the air path reversing member is located above the sealing cover, the upper cover is installed in the middle of the upper end of the base inner cavity and presses the upper end of the air path reversing member, and the upper end of the operating rod is connected to the handle. The present invention effectively protects the sealing gasket, improves the service life and sealing performance of the sealing gasket, and sends the gas entering from the bottom out from the bottom or side, meeting the application requirement of the air oxygen supply system where the gas enters from the bottom.

Description

Technical Field

[0001] The present invention relates to a two-position three-way valve, and in particular to a manually pressable two-position three-way gas switching valve. Background Art

[0002] A two-position three-way valve has two working positions and three interfaces. It is generally a solenoid valve, but there are also manual valves. The two-position three-way valve used for gas switching is called a two-position three-way gas switching valve, also known as a two-position three-way gas reversing valve. It is a valve that switches gas from one outlet to another.

[0003] Two-position three-way gas switching valves are mostly solenoid valves, but there are also manual valves. In some specific applications, such as aviation oxygen supply systems, manual two-position three-way gas switching valves are generally used to control the conversion between normal oxygen supply mode and continuous oxygen supply (or emergency oxygen supply) mode.

[0004] The traditional manual two-position three-way gas switching valve has the following defects: during the switching operation, the seal is in close contact with the rotating part, and the seal needs to withstand the friction during the rotation of the rotating part. After repeated use, the seal is easy to wear, resulting in a decrease in sealing performance and a shortened product life. For example, traditional ball valves and butterfly valves all have this problem; in addition, the operating mode and interface of the traditional manual two-position three-way gas switching valve are not suitable for some specific application scenarios of the aviation oxygen supply system. For example, the bottom of the gas switching valve needs to be connected to other components to achieve the purpose of oxygen entering the valve, but the traditional manual two-position three-way gas switching valve does not have such an interface structure. Summary of the Invention

[0005] The purpose of the present invention is to provide a manual push-type two-position three-way gas switching valve with a long service life and an air inlet located at the bottom in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] The cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with an air filter, and the cam is provided with The cam is secured to the airtight container and is adapted to engage the airtight seal of the airbag and to engage the airtight sealant at the bottom of the container.

[0008] Preferably, in order to facilitate application in an aviation oxygen supply system, the first air outlet and the second air outlet are respectively arranged at the bottom of the base, the first air outlet is communicated with the first air outlet through a first air channel provided in the cavity wall of the base cavity, and the second air outlet is communicated with the second air outlet through a second air channel provided in the cavity wall of the base cavity.

[0009] Preferably, in order to limit the rotation angle of the operating lever so as to complete the reversing operation more conveniently and reliably, a convex rotation limit portion is provided in the middle of the upper end of the upper cover, and the rotation limit portion is provided with a limiting notch. A rotation limit block is installed at a position on the operating lever corresponding to the limiting notch, and the rotation limit block is placed in the limiting notch and allows the operating lever to rotate only within a range of 90°.

[0010] Preferably, in order to facilitate the adjustment of the elastic force of the compression spring to meet different application requirements, the compression spring mounting hole is a through hole and its lower section is provided with an internal thread, and an adjusting stud with an external thread is installed in the lower section of the compression spring mounting hole and threadedly connected, and the upper end of the adjusting stud contacts the lower end of the compression spring.

[0011] Preferably, in order to reduce the friction between the sealing cover and the compression spring limiting cover to prevent the compression spring limiting cover from rotating with the sealing cover, a transmission cover having an upper surface that is an upward convex arc surface is provided on the upper portion of the compression spring limiting cover.

[0012] Preferably, in order to facilitate the selection of air outlets in different positions according to actual conditions, a first side air outlet communicating with the first air hole and a second side air outlet communicating with the second air hole are provided on the side wall of the inner cavity of the base, and the first side air outlet and the second side air outlet are respectively installed with blockages.

[0013] The beneficial effects of the present invention are:

[0014] The present invention utilizes a handle and an operating rod to realize the pressing and rotating functions of the sealing cover. No rotational friction occurs during the contact and sealing process with the air inlet sealing end of the air path reversing member, effectively protecting the sealing gasket and improving the service life and sealing performance of the sealing gasket. In addition, through the air path reversing function of the air path reversing member, the gas entering from the bottom is sent out from the bottom or side through reversing control, meeting the application requirement of the aviation oxygen supply system that the bottom of the gas switching valve needs to be connected to other components to realize the entry of oxygen into the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional exploded view of the manual push-type two-position three-way gas switching valve of the present invention before assembly;

[0016] Figure 2 This is a three-dimensional diagram of the assembled manual push-type two-position three-way gas switching valve of the present invention;

[0017] Figure 3 is a perspective view of the operating lever of the manual push-type two-position three-way gas switching valve of the present invention;

[0018] Figure 4 This is a three-dimensional diagram of the gas path reversing member of the manual push-type two-position three-way gas switching valve of the present invention;

[0019] Figure 5 1. It is a top view of the manual push-type two-position three-way gas switching valve of the present invention;

[0020] Figure 6 This is a bottom view of the manual push-type two-position three-way gas switching valve of the present invention;

[0021] Figure 7 AA is a cross-sectional view of the top view of the manual push-type two-position three-way gas switching valve of the present invention;

[0022] Figure 8 This is a cross-sectional view of the manual push-type two-position three-way gas switching valve of the present invention rotated 90° counterclockwise from the cross-sectional view BB in the top view;

[0023] Figure 9 This is a three-dimensional diagram of the manual push-type two-position three-way gas switching valve of the present invention when the operating rod drives the gas path reversing member to rotate until the air inlet is connected to the first air outlet;

[0024] Figure 10 It is a three-dimensional diagram of the manual push-type two-position three-way gas switching valve of the present invention when the operating rod drives the gas path reversing member to rotate until the air inlet and the second air outlet are connected. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] like Figures 1-8As shown, the manual push-type two-position three-way gas switching valve of the present invention includes a base 17, a compression spring 14, a compression spring limit cover 13, a sealing cover 10, a gas path reversing member 7, an upper cover 4, an operating rod 3 and a handle 1. The base 17 is provided with a base cavity 30 with an upper end opening, an air inlet 25 is provided at the bottom of the base 17, and the air inlet 25 is communicated with the lower part of the base cavity 30, a first air outlet 27 and a second air outlet 26 are provided at the bottom or side wall of the base 17, and a vertical compression spring mounting hole is provided at the bottom center of the base cavity 30. 18, the lower part of the compression spring limiting cover 13 is a cylinder with an open lower end and a closed upper end, and the upper section of the compression spring 14 is placed in the cylinder and the lower section of the cylinder is placed in the compression spring mounting hole 18, and the lower section of the compression spring 14 is also placed in the compression spring mounting hole 18. The sealing cover 10 is placed above the compression spring limiting cover 13 and is connected to the lower end of the vertical operating rod 3. The two sides between the two ends of the sealing cover 10 are respectively concave to form a waist-shaped groove 21. One end of the two ends of the sealing cover 10 is provided with a sealing gasket mounting groove 22 and the sealing gasket 11 is installed in the sealing gasket mounting groove. A conical sealing blind hole 20 is provided on the other end of the mounting groove 22. The gas path reversing member 7 is installed in the middle and upper part of the base inner cavity 30 and is sealed with the inner wall of the base inner cavity 30 and cannot move vertically. The gas path reversing member 7 is located above the sealing cover 10 and the operating rod 3 passes through the central through hole of the gas path reversing member 7. The lower end surface of the gas path reversing member 7 is provided with a downwardly protruding and annular first air inlet sealing end 8 and a second air inlet sealing end 9. The first air inlet sealing end 8 can be sealed with the sealing gasket 11, and the second air inlet sealing end 9 can be sealed with the sealing gasket 11. The blind hole 20 is sealed, and a first air vent 6 (an "L"-shaped through hole in the figure) and a second air vent 31 (a vertical straight through hole in the figure) are provided in the air path reversing member 7. The first air vent 6 is communicated with the first air inlet sealing end 8 and the first air outlet 27, and the second air vent 31 is communicated with the second air inlet sealing end 9 and the second air outlet 26. The upper cover 4 is installed in the middle of the upper end of the base cavity 30 and presses the upper end of the air path reversing member 7. The operating rod 3 passes through the central through hole of the upper cover 4, and the upper end of the operating rod 3 is connected to the handle 2.

[0027] like Figures 1-8 As shown, the present invention also discloses the following multiple more optimized specific structures:

[0028] To facilitate use in aviation oxygen supply systems, a first air outlet 27 and a second air outlet 26 are respectively provided at the bottom of the base 17. The first air vent 6 communicates with the first air outlet 27 via a first air passage 29 provided within the wall of the base cavity 30. The second air vent 31 communicates with the second air outlet 26 via a second air passage (not visible in the figure) provided within the wall of the base cavity 30. The specific shape, structure, and dimensions of the first air vent 6, the second air vent 31, the first air passage 29, and the second air passage can be determined according to actual needs, as long as they function as gas passages.

[0029] In order to limit the rotation angle of the operating rod 3 so as to complete the reversing operation more conveniently and reliably, a convex rotation limit portion (not marked in the figure) is provided in the middle of the upper end of the upper cover 4, and the rotation limit portion is provided with a limiting notch (not marked in the figure). A rotation limit block 5 is installed at a position corresponding to the limiting notch on the operating rod 3. The rotation limit block 5 is placed in the limiting notch and allows the operating rod 3 to rotate only within a range of 90°. This is a very simple limiting structure that can be easily implemented using existing technology.

[0030] In order to facilitate the adjustment of the elastic force of the compression spring 14 to meet different application requirements, the compression spring mounting hole 18 is a through hole and its lower section is provided with an internal thread. The adjusting stud 19 with an external thread is installed in the lower section of the compression spring mounting hole 18 and threadedly connected. The upper end of the adjusting stud 19 contacts the lower end of the compression spring 14, and the lower end surface of the adjusting stud 19 is provided with an "I" groove or a "X" groove for cooperating with the knife.

[0031] In order to reduce the friction between the sealing cover 10 and the compression spring limiting cover 13 to prevent the compression spring limiting cover 13 from rotating with the sealing cover 10, a transmission cover 12 with an upper surface being an upward convex arc surface is provided on the upper part of the compression spring limiting cover 13.

[0032] In order to facilitate the selection of air outlets at different positions according to actual conditions, a first side air outlet 16 communicating with the first air vent 6 and a second side air outlet 15 communicating with the second air vent 31 are provided on the side wall of the base inner cavity 30. The first side air outlet 16 and the second side air outlet 15 are respectively installed with a plug 28 (the plug 28 is only installed at Figure 7 shown in the figure, not shown in other figures).

[0033] Figure 1 、 Figure 2 、 Figure 7-10 Also shown is a connecting rod 2 for connecting the handle 1 and the operating rod 3. Figure 4 Also shown is an annular sealing groove 23 provided on the upper circumferential outer wall of the gas path reversing member 7 and two positioning posts 24 provided on the lower end surface of the gas path reversing member 7. A sealing ring is provided in the annular sealing groove 23. Figure 8 Also shown is an air outlet 32 ​​for air intake that is in communication with the air inlet 25 and is located on the side wall of the base inner cavity 30. A corresponding bending structure is provided between the air outlet 32 ​​for air intake and the air inlet 25 as required. These structures are all conventional adaptive structures.

[0034] like Figures 1-10As shown, when in use, the air inlet 25 is connected to an air supply device such as an oxygen concentrator, the first air outlet 27 is connected to one of the air-using components such as a normal oxygen supply component, and the second air outlet 26 is connected to another air-using component such as a continuous oxygen supply component; under normal circumstances, gas such as oxygen enters the base cavity 30 through the air inlet 25 and is located below the air path reversing member 7. At this time, the second air inlet sealing end 9 of the air path reversing member 7 is sealed by the sealing blind hole 20 on the sealing cover 10, and the first air inlet sealing end 8 of the air path reversing member 7 is connected to the first air outlet 27. The gas passes through the first air inlet sealing end 8, the first vent hole 6, and the first air channel 29 in sequence and is then sent out from the first air outlet 27. Figure 7 and Figure 9 As shown; when the gas path needs to be changed, the handle 1 is rotated 90° by hand, the sealing cover 10 is rotated 90°, the first air inlet sealing end 8 of the gas path reversing member 7 is sealed by the sealing gasket 11, and the second air inlet sealing end 9 of the gas path reversing member 7 is connected to the second air outlet 26. The gas passes through the second air inlet sealing end 9, the second vent 31, the second air channel and then is sent out from the second air outlet 26. Figure 8 and Figure 10 If the gas-using components need to be connected to the side walls of the base 17, remove the plugs 28 of the first side air outlet 16 and the second side air outlet 15 and plug the first air outlet 27 and the second air outlet 26 respectively, and then connect the two gas-using components to the first side air outlet 16 and the second side air outlet 15 respectively.

[0035] The above embodiments are only preferred embodiments of the present invention and are not limitations on the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A manual push-type two-position three-way gas switching valve, characterized by: The cam is provided with an air inlet and an air inlet extending over the bottom of the cam, and the air inlet is communicated with the lower portion of the air inlet of the cam. The cam is secured to the airtight container and has a lip which extends outwardly past the lid and into the airtight container, wherein the cam is secured to the airtight container and has a lip which extends outwardly past the lid and into the airtight container.

2. The manual push-type two-position three-way gas switching valve according to claim 1, characterized in that: The first air outlet and the second air outlet are respectively arranged at the bottom of the base, the first air vent is connected to the first air outlet through a first air channel arranged in the cavity wall of the base cavity, and the second air vent is connected to the second air outlet through a second air channel arranged in the cavity wall of the base cavity.

3. The manual push-type two-position three-way gas switching valve according to claim 1 or 2, characterized in that: A convex rotation limit portion is provided in the middle of the upper end of the upper cover, and the rotation limit portion is provided with a limit notch. A rotation limit block is installed at a position corresponding to the limit notch on the operating rod. The rotation limit block is placed in the limit notch and allows the operating rod to rotate only within a 90° range.

4. The manual push-type two-position three-way gas switching valve according to claim 1 or 2, characterized in that: The compression spring mounting hole is a through hole and its lower section is provided with an internal thread. An adjusting stud with an external thread is installed in the lower section of the compression spring mounting hole and is threadedly connected. The upper end of the adjusting stud contacts the lower end of the compression spring.

5. The manual push-type two-position three-way gas switching valve according to claim 1 or 2, characterized in that: A transmission cover with an upper surface that is an upward convex arc surface is provided on the upper part of the compression spring limiting cover.

6. The manual push-type two-position three-way gas switching valve according to claim 1 or 2, characterized in that: A first side air outlet communicating with the first air vent and a second side air outlet communicating with the second air vent are provided on the side wall of the inner cavity of the base, and the first side air outlet and the second side air outlet are respectively installed with plugs.

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