Pneumatic reversing valve, purely pneumatic emergency supply system and method of operation

Abstract

The application provides a pneumatic reversing valve, a pure pneumatic emergency supply system and a working method, comprising a valve body and a valve core. The valve body is provided with a gas exchange cavity, a first throttling exhaust hole and a second throttling exhaust hole arranged at the axial two ends of the gas exchange cavity respectively. The cavity wall of the gas exchange cavity is provided with a gas supply through hole, and a first gas exchange through hole and a second gas exchange through hole are arranged on the two sides. The valve core is arranged in the gas exchange cavity and is relatively slidably sealed, and can be switched between a first gas exchange position and a second gas exchange position. When the valve core is in the first gas exchange position, the gas supply through hole is communicated with the first gas exchange through hole, the second gas exchange through hole is communicated with the second throttling exhaust hole, and the gas is discharged through the second throttling exhaust hole to drive the valve core to reverse. When the valve core is in the second gas exchange position, the gas supply through hole is communicated with the second gas exchange through hole, the first gas exchange through hole is communicated with the first throttling exhaust hole, and the gas is discharged through the first throttling exhaust hole to drive the valve core to reverse. The pressure difference formed by throttling exhaust is used to realize pure pneumatic automatic reciprocating reversing, and the pump body can be continuously and circularly driven to work.

Description

Technical Field

[0001] This invention relates to the field of pneumatic directional valve technology, and in particular to pneumatic directional valves, pure pneumatic emergency supply systems, and their operating methods. Background Technology

[0002] In modern continuous industrial semiconductor production, a stable supply of materials is crucial for ensuring the continuous and stable operation of production equipment and the overall system. Currently, the material supply system of semiconductor production equipment relies heavily on mains power supply and PLC-based electrical control systems to achieve automated operation.

[0003] For single PLC shutdown failures, existing technologies typically employ emergency solutions using DIP switches. However, these solutions require an intact power circuit and are only applicable to single electrical control equipment failures, limiting their applicability. When a complete power outage occurs in the material supply equipment area or throughout the plant, and backup power systems such as UPS fail simultaneously, the entire material supply system will be paralyzed. Specifically, conventional DIP switches rely on electronic components for power, becoming completely ineffective after a power outage and unable to provide emergency switching. Furthermore, the automatic control and backup manual control modes of the dual-source air pumps, the core power equipment for material supply, are entirely powered. A power outage completely disables the automatic air circuit switching function, preventing the dual-source air pumps from starting and directly causing a complete interruption of the entire plant's material supply process. Summary of the Invention

[0004] The pneumatic reversing valve, pure pneumatic emergency supply system, and working method provided in this invention at least solve the problem that dual-source pumps cannot maintain their operation by electricity under power failure conditions.

[0005] On one hand, the present invention provides a pneumatic reversing valve, comprising: a valve body having a ventilation chamber, a first throttling exhaust port, and a second throttling exhaust port; the first throttling exhaust port and the second throttling exhaust port are disposed at both ends of the ventilation chamber along its axial direction, and the ventilation chamber connects the first throttling exhaust port and the second throttling exhaust port; the ventilation chamber wall is provided with an air supply through-hole, a first ventilation through-hole, and a second ventilation through-hole, wherein along the axial direction of the ventilation chamber, the first ventilation through-hole is disposed between the air supply through-hole and the first throttling exhaust port, and the second ventilation through-hole is disposed between the air supply through-hole and the second throttling exhaust port; a valve core disposed within the ventilation chamber; and the valve core sliding with respect to the ventilation chamber along its axial direction. The valve core is sealed to switch between a first ventilation position and a second ventilation position. When the valve core is switched to the first ventilation position, the air supply port is connected to the first ventilation port, and the second throttling exhaust port is connected to the second ventilation port, so that the gas supplied by the second ventilation port is discharged through the second throttling exhaust port, and the valve core moves from the first ventilation position to the second ventilation position. When the valve core is switched to the second ventilation position, the air supply port is connected to the second ventilation port, and the first throttling exhaust port is connected to the first ventilation port, so that the gas supplied by the first ventilation port is discharged through the first throttling exhaust port, and the valve core moves from the first ventilation position to the second ventilation position.

[0006] In one embodiment of the present invention, the device further includes: a first throttling muffler, one end of which is disposed within the first throttling exhaust hole and threadedly connected to the first throttling exhaust hole; a third throttling exhaust hole is provided on the first throttling muffler, the third throttling exhaust hole communicating with the first throttling exhaust hole; a second throttling muffler, one end of which is disposed within the second throttling exhaust hole and threadedly connected to the second throttling exhaust hole; and a fourth throttling exhaust hole is provided on the second throttling muffler, the fourth throttling exhaust hole communicating with the second throttling exhaust hole.

[0007] In one embodiment of the present invention, a first adjusting member is provided at the end of the first throttling muffler away from the valve body, the first adjusting member is connected to the first throttling muffler, and the first adjusting member is used to adjust the opening of the third throttling exhaust port; a second adjusting member is provided at the end of the second throttling muffler away from the valve body, the second adjusting member is connected to the second throttling muffler, and the second adjusting member is used to adjust the opening of the fourth throttling exhaust port.

[0008] In one embodiment of the present invention, it further includes: two end caps, which are disposed at both ends of the valve core along the axial direction of the valve core and connected to the valve core; and the end caps are slidably sealed to the ventilation chamber along the axial direction of the ventilation chamber.

[0009] In one embodiment of the present invention, the valve body is provided with a first adjusting through hole and a second adjusting through hole. Along the axial direction of the air exchange chamber, the first adjusting through hole and the second adjusting through hole are disposed on both sides of the valve body, and the air exchange chamber is respectively connected to the first adjusting through hole and the second adjusting through hole. The pneumatic reversing valve further includes: a first pressing member and a second pressing member. The first pressing member passes through the first adjusting through hole and is slidably connected to the first adjusting through hole along the axial direction of the air exchange chamber. One end of the first pressing member is connected to the end cap at one end of the valve core. The second pressing member passes through the second adjusting through hole and is slidably connected to the second adjusting through hole along the axial direction of the air exchange chamber. One end of the second pressing member is connected to the end cap at the other end of the valve core.

[0010] In one embodiment of the present invention, along the axial direction of the valve core, a first sealing groove is provided at both ends of the valve core, and a first sealing ring is provided in the first sealing groove; the two radial ends of the first sealing ring respectively abut against the bottom surface of the first sealing groove and the inner wall surface of the ventilation chamber for sealing.

[0011] In one embodiment of the present invention, the device further includes: a bushing tube disposed within the ventilation chamber, the outer wall surface of the bushing tube being spaced apart from the inner wall surface of the ventilation chamber; the bushing tube being sleeved on the middle portion of the valve core, the inner wall surface of the bushing tube being spaced apart from the outer wall surface of the valve core; the bushing tube being provided with a plurality of third ventilation holes, the plurality of third ventilation holes being evenly spaced along the circumference of the bushing tube, one end of each third ventilation hole communicating with the ventilation chamber, and the other end of each third ventilation hole communicating with the space between the inner wall surface of the bushing tube and the outer wall surface of the valve core.

[0012] In one embodiment of the present invention, the method further includes: along the axial direction of the bushing tube, a second sealing groove is provided at both ends of the bushing tube, and a second sealing ring is provided in the second sealing groove; the two ends of the second sealing ring in the radial direction respectively abut and seal with the bottom surface of the second sealing groove and the inner wall surface of the ventilation chamber.

[0013] Secondly, the present invention also provides a purely pneumatic emergency supply system, including the aforementioned pneumatic reversing valve.

[0014] Thirdly, the present invention also provides a method for operating a pneumatic reversing valve, applied to the aforementioned pneumatic reversing valve, characterized by comprising the following steps: switching the valve core in the ventilation chamber of the valve body to a first ventilation position, such that the air supply port is connected to the first ventilation port, and the second throttling exhaust port is connected to the second ventilation port, so that the gas supplied by the second ventilation port is discharged through the second throttling exhaust port; wherein, the valve body is provided with the second throttling exhaust port and the first throttling exhaust port; the first throttling exhaust port and the second throttling exhaust port are located at both ends of the axial direction of the ventilation chamber, and the ventilation chamber is connected to the first throttling exhaust port and the second throttling exhaust port; the ventilation chamber wall is provided with the air supply port, the first ventilation port and the second ventilation port, and along the axial direction of the ventilation chamber, the first ventilation port is provided with... The second ventilation through-hole is disposed between the air supply through-hole and the first throttling exhaust through-hole; the valve core slides and seals with the ventilation chamber along the axial direction of the ventilation chamber to switch between a first ventilation position and a second ventilation position; when the valve core is switched to the first ventilation position, the valve core moves from the first ventilation position to the second ventilation position; the valve core is controlled to switch to the second ventilation position, such that the air supply through-hole communicates with the second ventilation through-hole, and the first throttling exhaust through-hole communicates with the first ventilation through-hole, so that the gas supplied by the first ventilation through-hole is discharged through the first throttling exhaust through-hole; wherein, when the valve core is switched to the second ventilation position, the valve core moves from the first ventilation position to the second ventilation position.

[0015] The pneumatic reversing valve, pure pneumatic emergency supply system, and working method provided in this invention have the following technical advantages compared to the prior art: A valve core is installed in the ventilation chamber of the valve body and slides and seals relative to the ventilation chamber. A first throttling exhaust port and a second throttling exhaust port are respectively provided at both ends of the axial direction of the ventilation chamber. The cavity wall of the ventilation chamber is provided with an air supply through-hole for connecting to an external air source, and a first ventilation through-hole and a second ventilation through-hole respectively connected to the pump chambers on both sides of the dual air source pump. The exhaust gas returning from the dual air source pump is throttled and exhausted through the first throttling exhaust port and the second throttling exhaust port, which have throttling functions at both ends, forming a low-pressure back pressure lower than the air source pressure at the end of the ventilation chamber. The pressure difference formed by the high air source pressure in the middle of the valve core and the low-pressure back pressure on one side drives the valve core to automatically reciprocate and switch positions, eliminating the need for a mechanical return spring or electrical control components. This achieves pure pneumatic-driven valve core cyclic reversal, with no electrical or spring-like easily damaged parts, making it suitable for flammable and explosive environments and power outage emergency work scenarios, and ensuring stable and reliable reversing operation. Meanwhile, the overall structure is simple, reducing auxiliary parts and lowering assembly and maintenance difficulty and manufacturing costs. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is one of the schematic diagrams of the pneumatic reversing valve structure according to an embodiment of the present invention.

[0017] Figure 2 This is a second schematic diagram of the pneumatic directional valve structure according to an embodiment of the present invention.

[0018] Figure 3 This is the third schematic diagram of the pneumatic directional valve structure according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the valve body structure according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the valve core structure according to an embodiment of the present invention.

[0021] The above figures include the following reference numerals: 10. Valve body; 11. Air exchange chamber; 111. Air supply port; 112. First air exchange port; 113. Second air exchange port; 12. First throttling exhaust port; 13. Second throttling exhaust port; 14. First adjusting port; 15. Second adjusting port; 20. Valve core; 21. First sealing groove; 22. First sealing ring; 30. First throttling silencer; 31. First adjusting component; 32. Third throttling exhaust port; 40. Second throttling silencer; 41. Second adjusting component; 42. Fourth throttling exhaust port; 50. End cap; 60. First pressing component; 70. Second pressing component; 80. Bushing tube; 81. Third ventilation hole; 82. Second sealing groove; 83. Second sealing ring. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0025] To solve the above technical problems, see [link to relevant documentation]. Figures 1 to 5 As shown, this application provides a pneumatic reversing valve, including a valve body 10 and a valve core 20. The valve body 10 is provided with a ventilation chamber 11, a first throttling exhaust port 12, and a second throttling exhaust port 13. Specifically, the first throttling exhaust port 12 and the second throttling exhaust port 13 are located at opposite ends of the ventilation chamber 11, and the ventilation chamber 11 is connected to both the first throttling exhaust port 12 and the second throttling exhaust port 13. It can be understood that the first throttling exhaust port 12 and the second throttling exhaust port 13 can discharge the gas required to be discharged from the ventilation chamber 11. Furthermore, when the discharged gas enters the first throttling exhaust port 12 or the second throttling exhaust port 13, it is throttled within the first throttling exhaust port 12 or the second throttling exhaust port 13 to control the gas discharge rate and create back pressure.

[0026] For example, the first throttling exhaust port 12 and the second throttling exhaust port 13 can be configured as tapered orifices, with the larger end of the tapered orifice connected to the ventilation chamber 11, thereby throttling the discharged gas and creating back pressure. The first throttling exhaust port 12 and the second throttling exhaust port 13 can also be configured as multi-stage stepped orifices, with the largest end of the multi-stage stepped orifice connected to the ventilation chamber 11, and the diameter decreasing step by step, thereby throttling the discharged gas and creating back pressure. For example, throttling components can also be provided in the first throttling exhaust port 12 and the second throttling exhaust port 13 to throttle the discharged gas and create back pressure. Specifically, throttling silencers can be installed at the orifices of the first throttling exhaust port 12 and the second throttling exhaust port 13, and the throttling structure in the throttling silencer achieves throttling of the discharged gas and creates back pressure. The throttling structure in the throttling silencer can be an annular micro-perforated plate, a labyrinthine micro-perforated baffle, or a V-shaped micro-perforated baffle.

[0027] Furthermore, the ventilation chamber 11 has a supply air passage 111, a first ventilation passage 112, and a second ventilation passage 113 on its cavity wall. Along the axial direction of the ventilation chamber 11, the first ventilation passage 112 is located between the supply air passage 111 and the first throttling exhaust port 12. Correspondingly, the second ventilation passage 113 is located between the supply air passage 111 and the second throttling exhaust port 13. The supply air passage 111 is used to connect to an external air source, thereby supplying the ventilation chamber 11 with the required gas. The first ventilation passage 112 is connected to one pump chamber of the dual-source pump, while the second ventilation passage 113 is connected to the other pump chamber of the dual-source pump.

[0028] During operation, the pump chamber connected to the first ventilation port 112 requires air intake. The air source delivers the required gas to the ventilation chamber 11 through the air supply port 111 and inputs it into the pump chamber through the first ventilation port 112. At the same time, the pump chamber connected to the second ventilation port 113 simultaneously exhausts gas. Part of the gas to be discharged is discharged through the exhaust structure of the pump chamber, and the remaining gas is input into the ventilation chamber 11 through the second ventilation port 113 and discharged through the second throttling exhaust port 13, thus creating back pressure.

[0029] Conversely, the pump chamber connected to the second ventilation port 113 requires air intake. The air source delivers the required gas to the ventilation chamber 11 through the air supply port 111 and inputs it into the pump chamber through the second ventilation port 113. At the same time, the pump chamber connected to the first ventilation port 112 simultaneously exhausts gas. Part of the gas to be exhausted is discharged through the exhaust structure of the pump chamber, and the remaining gas is input into the ventilation chamber 11 through the first ventilation port 112 and discharged through the first throttling exhaust port 12, thus creating back pressure.

[0030] The valve core 20 is disposed within the ventilation chamber 11. Along the axial direction of the ventilation chamber 11, the valve core 20 slides and seals against the ventilation chamber 11 to switch between a first ventilation position and a second ventilation position. It is understood that at least a portion of the valve core 20 has a gap with the ventilation chamber 11 to allow gas flow. Preferably, the valve core 20 has an annular groove in its middle portion, which communicates with the air supply through-hole 111. In this case, both ends of the valve core 20 slide and seal against the ventilation chamber.

[0031] When valve core 20 is switched to the first ventilation position, it moves to the end of ventilation chamber 11 near the first throttling exhaust port 12. At this time, the annular groove on valve core 20 communicates with the first ventilation through-hole 112, allowing the air supply through-hole 111 to supply air to one pump chamber of the corresponding dual-source pump through the first ventilation through-hole 112. Simultaneously, the second ventilation through-hole 113 communicates with the second throttling exhaust port 13, allowing one pump chamber of the corresponding dual-source pump to exhaust air into the second throttling exhaust port 13 through the second ventilation through-hole 113. The second throttling exhaust port 13 throttles and exhausts the discharged air, creating a low-pressure back pressure. Because the air pressure supplied to ventilation chamber 11 is greater than the low-pressure back pressure, valve core 20 gradually moves from the first ventilation position to the second ventilation position.

[0032] When valve core 20 is switched to the second ventilation position, it moves to the end of ventilation chamber 11 near the second throttling exhaust port 13. At this time, the annular groove on valve core 20 communicates with the second ventilation through-hole 113, allowing the air supply through-hole 111 to supply air to the other pump chamber of the corresponding dual-source pump through the second ventilation through-hole 113. Simultaneously, the first ventilation through-hole 112 communicates with the first throttling exhaust port 12, allowing one pump chamber of the corresponding dual-source pump to exhaust air into the first throttling exhaust port 12 through the first ventilation through-hole 112. The first throttling exhaust port 12 throttles and exhausts the discharged gas, creating a low-pressure back pressure. Because the air pressure supplied to ventilation chamber 11 is greater than the low-pressure back pressure, valve core 20 gradually moves from the second ventilation position to the first ventilation position.

[0033] In this way, by using differential pressure to drive the valve core 20 to switch back and forth between the first air exchange position and the second air exchange position, the dual air source pump can operate continuously without the need for additional power supply and drive device.

[0034] In summary, the pneumatic reversing valve of the present invention mainly consists of a valve body 10 and a valve core 20 that is slidably sealed within the air exchange chamber 11 of the valve body 10. A first throttling exhaust port 12 and a second throttling exhaust port 13 are respectively provided at both ends of the air exchange chamber 11 along its axial direction. The chamber wall of the air exchange chamber 11 is provided with an air supply through-hole 111 for connecting to an external air source, and a first air exchange through-hole 112 and a second air exchange through-hole 113 respectively connected to the pump chambers on both sides of a dual-air-source pump. The exhaust gas returning from the dual-air-source pump is throttled and exhausted through the first throttling exhaust port 12 and the second throttling exhaust port 13, which have throttling functions at both ends. A low-pressure back pressure lower than the air source pressure is formed at the end of the air exchange chamber 11. The pressure difference between the high air source pressure in the middle of the valve core 20 and the low-pressure back pressure on one side drives the valve core 20 to automatically reciprocate, eliminating the need for a mechanical return spring and electrical control components. This enables a pure pneumatically driven valve core for 20-cycle reversing, eliminating the need for electrical or spring-related consumable parts. It is suitable for flammable, explosive, and power-outage emergency applications, ensuring stable and reliable reversing operation. Furthermore, its simple overall structure reduces auxiliary components, lowering assembly and maintenance complexity and manufacturing costs.

[0035] Reference Figures 1 to 4 As shown, in some embodiments of the pneumatic reversing valve of the present invention, a first throttling silencer 30 and a second throttling silencer 40 are further included. One end of the first throttling silencer 30 is disposed within and threadedly connected to the first throttling exhaust port 12. A third throttling exhaust port 32 is provided on the first throttling silencer 30, and the third throttling exhaust port 32 communicates with the first throttling exhaust port 12. It is understood that the diameter of the third throttling exhaust port 32 is smaller than the diameter of the first throttling exhaust port 12, thereby achieving preliminary throttling of the discharged gas through diameter change and forming a low-pressure back pressure in the corresponding air exchange chamber 11 section.

[0036] Furthermore, a first adjusting member 31 is provided at the end of the first throttling silencer 30 away from the valve body 10. The first adjusting member 31 is connected to the first throttling silencer 30 and is used to adjust the opening degree of the third throttling exhaust port 32. For example, the first adjusting member 31 is configured as an adjustable conical needle valve. By adjusting the annular throttling gap between the needle tip of the conical needle valve and the third throttling exhaust port 32, the opening degree of the third throttling exhaust port 32 is adjusted, thereby adjusting the gas discharge rate and the magnitude of the back pressure.

[0037] Correspondingly, one end of the second throttling muffler 40 is disposed within the second throttling exhaust port 13 and is threadedly connected to the second throttling exhaust port 13. The second throttling muffler 40 is provided with a fourth throttling exhaust port 42, which communicates with the second throttling exhaust port 13. Understandably, the diameter of the fourth throttling exhaust port 42 is smaller than the diameter of the second throttling exhaust port 13, thereby achieving preliminary throttling of the discharged gas through diameter change and forming a low-pressure back pressure in the corresponding ventilation chamber 11 section.

[0038] Furthermore, a second adjusting member 41 is provided at the end of the second throttling silencer 40 away from the valve body 10. The second adjusting member 41 is connected to the second throttling silencer 40 and is used to adjust the opening degree of the fourth throttling exhaust port 42. For example, the second adjusting member 41 is also configured as an adjustable conical needle valve. By adjusting the annular throttling gap between the needle tip of the conical needle valve and the fourth throttling exhaust port 42, the opening degree of the fourth throttling exhaust port 42 is adjusted, thereby adjusting the gas discharge rate and the magnitude of the back pressure.

[0039] Reference Figures 2 to 3 As shown, in some embodiments of the pneumatic reversing valve of the present invention, two end caps 50 are further included. The two end caps 50 are respectively disposed at both ends of the valve core 20 along the axial direction of the valve core 20, and are connected to the valve core 20. Furthermore, the end caps 50 are slidably sealed to the air exchange chamber 11 along the axial direction of the air exchange chamber 11. Thus, the end caps 50 can move with the valve core 20 and slidably seal to the air exchange chamber 11, preventing air leakage between the supply and exhaust sides.

[0040] Furthermore, a first adjustment through hole 14 and a second adjustment through hole 15 are provided on the valve body 10. Along the axial direction of the air exchange chamber 11, the first adjustment through hole 14 and the second adjustment through hole 15 are provided on both sides of the valve body 10, and the air exchange chamber is connected to the first adjustment through hole 14 and the second adjustment through hole 15 respectively.

[0041] The pneumatic reversing valve also includes a first pressing member 60 and a second pressing member 70. The first pressing member 60 passes through the first adjusting through hole 14 and is slidably connected to the first adjusting through hole 14 along the axial direction of the air exchange chamber 11. One end of the first pressing member 60 is connected to the end cap 50 at one end of the valve core 20.

[0042] Correspondingly, the second pressing member 70 passes through the second adjusting through hole 15 and is slidably connected to the second adjusting through hole 15 along the axial direction of the ventilation chamber 11. The second pressing member 70 is connected to the end cap 50 at the other end of the valve core 20.

[0043] Before the pneumatic reversing valve operates, the valve core 20 must be switched to the second ventilation position by pressing the first pressing element 60. Alternatively, the valve core 20 can be switched to the first ventilation position by pressing the second pressing element 70. Thus, when manually switching to the first or second ventilation position, air can be supplied to one pump chamber of the dual-source pump while air is exhausted from the other. Subsequently, the pressure difference automatically switches between the first and second ventilation positions, enabling autonomous pneumatic drive of the dual-source pump.

[0044] Reference Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments of the pneumatic reversing valve of the present invention, a first sealing groove 21 is provided at both ends of the valve core 20 along the axial direction, and a first sealing ring 22 is provided in the first sealing groove 21. The two radial ends of the first sealing ring 22 respectively abut and seal against the bottom surface of the first sealing groove 21 and the inner wall surface of the air exchange chamber 11. In this way, the middle part of the valve core 20 is sealed and isolated from the chambers at both ends of the air exchange chamber 11, preventing air leakage between the exhaust side and the air supply side.

[0045] Understandably, multiple first sealing grooves 21 can be provided, and correspondingly, multiple first sealing rings 22 can also be provided to further improve sealing performance.

[0046] Reference Figure 2 , Figure 3 as well as Figure 5 As shown, in some embodiments of the pneumatic reversing valve of the present invention, a bushing 80 is further included. The bushing 80 is disposed within the ventilation chamber 11, and is spaced apart from the inner wall of the ventilation chamber 11. This allows the gas supplied by the air supply port 111 to be transported through the gap between the two ports to the first ventilation port 112 or the second ventilation port 113, thereby providing the required gas to the pump chamber of the dual-source pump.

[0047] Furthermore, the bushing 80 is sleeved in the middle of the valve core 20, with the inner wall of the bushing 80 spaced apart from the outer wall of the valve core 20. The bushing 80 is provided with multiple third ventilation holes 81, evenly spaced along the circumference of the bushing 80. One end of each third ventilation hole 81 communicates with the ventilation chamber 11, while the other end communicates with the space between the inner wall of the bushing 80 and the outer wall of the valve core 20. Thus, gas supplied by the air supply hole 111 can be transported through the gap between the ventilation chamber and the bushing 80 to the first ventilation hole 112 or the second ventilation hole 113. It can also enter the gap between the inner wall of the bushing tube 80 and the outer wall of the valve core 20 through one or more third ventilation holes 81, and output from other third ventilation holes 81 near the first ventilation hole 112 or the second ventilation hole 113, and finally be delivered to the first ventilation hole 112 or the second ventilation hole 113.

[0048] Furthermore, along the axial direction of the bushing tube 80, a second sealing groove 82 is provided at both ends of the bushing tube 80, and a second sealing ring 83 is provided in the second sealing groove 82. The two radial ends of the second sealing ring 83 abut against the bottom surface of the second sealing groove 82 and the inner wall surface of the air exchange chamber 11 respectively to seal, further improving the sealing performance and preventing air leakage between the exhaust side and the air supply side.

[0049] Secondly, this application also provides a purely pneumatic emergency supply system, including the aforementioned pneumatic directional valve. The purely pneumatic emergency supply system further includes an air source and a housing. The pneumatic directional valve is housed within the housing, and the air supply end of the air source is connected to the air supply port 111 of the valve body 10. It is understood that the features and technical effects of the pneumatic directional valve are also present in the purely pneumatic emergency supply system, and will not be elaborated further.

[0050] Thirdly, embodiments of this application also provide a method for operating a pneumatic directional valve, including the following steps: The valve core 20 in the ventilation chamber 11 of the valve body 10 is switched to the first ventilation position, so that the air supply port 111 is connected to the first ventilation port 112, and the second throttling exhaust port 13 is connected to the second ventilation port 113, so that the gas supplied by the second ventilation port 113 is discharged through the second throttling exhaust port 13. The valve body 10 is provided with the second throttling exhaust port 13 and the first throttling exhaust port 12. The first throttling exhaust port 12 and the second throttling exhaust port 13 are located at opposite ends of the axial direction of the ventilation chamber 11, and the ventilation chamber 11 is connected to the first throttling exhaust port 12 and the second throttling exhaust port 13. The ventilation chamber 11 has a supply air hole 111, a first ventilation air hole 112, and a second ventilation air hole 113 on its wall surface. Along the axial direction of the ventilation chamber 11, the first ventilation air hole 112 is located between the supply air hole 111 and the first throttling exhaust hole 12, and the second ventilation air hole 113 is located between the supply air hole 111 and the second throttling exhaust hole 13. Along the axial direction of the ventilation chamber 11, the valve core 20 slides and seals against the ventilation chamber 11 to switch between a first ventilation position and a second ventilation position. When the valve core 20 is switched to the first ventilation position, it moves from the first ventilation position to the second ventilation position.

[0051] The control valve core 20 switches to the second ventilation position, connecting the air supply port 111 to the second ventilation port 113, and the first throttling exhaust port 12 to the first ventilation port 112, so that the gas supplied by the first ventilation port 112 is discharged through the first throttling exhaust port 12. Specifically, when the valve core 20 switches to the second ventilation position, the valve core 20 moves from the first ventilation position to the second ventilation position.

[0052] Working principle: Before starting work, connect the air supply port 111 to the air source, and then connect the first air exchange port 112 and the second air exchange port 113 to the two pump chambers of the dual air source pump respectively.

[0053] After the connection is completed, the valve core 20 is switched to the first ventilation position by pressing the second pressing element 70. At this time, the first ventilation through-hole 112 is connected to the air supply through-hole 111, and the air supply through-hole 111 supplies air to one pump chamber of the corresponding dual air source pump through the first ventilation through-hole 112. At the same time, the second ventilation through-hole 113 is connected to the second throttling exhaust port 13, and one pump chamber of the corresponding dual air source pump exhausts air into the second throttling exhaust port 13 through the second ventilation through-hole 113. The second throttling silencer 40 throttles the exhaust gas and forms a low-pressure back pressure in the corresponding ventilation chamber 11. Since the air pressure supplied in the ventilation chamber 11 is greater than the low-pressure back pressure, the valve core 20 will gradually move from the first ventilation position to the second ventilation position.

[0054] When the valve core 20 automatically switches to the second ventilation position, the second ventilation port 113 connects with the air supply port 111, allowing the air supply port 111 to supply air to the other pump chamber of the corresponding dual-source pump through the second ventilation port 113. Simultaneously, the first ventilation port 112 connects with the first throttling exhaust port 12, allowing one pump chamber of the corresponding dual-source pump to exhaust air into the first throttling exhaust port 12 through the first ventilation port 112. The first throttling silencer 30 throttles the exhaust air, creating a low-pressure back pressure in the corresponding ventilation chamber 11. Because the air pressure supplied to the ventilation chamber 11 is greater than the low-pressure back pressure, the valve core 20 gradually moves from the second ventilation position to the first ventilation position. This achieves pneumatic cycle drive of the dual-source pump.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0057] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pneumatic directional valve, characterized in that, include: The valve body is provided with a ventilation chamber, a first throttling exhaust port, and a second throttling exhaust port; the first throttling exhaust port and the second throttling exhaust port are located at both ends of the ventilation chamber along its axial direction, and the ventilation chamber connects the first throttling exhaust port and the second throttling exhaust port; the cavity wall of the ventilation chamber is provided with an air supply through hole, a first ventilation through hole, and a second ventilation through hole, and along the axial direction of the ventilation chamber, the first ventilation through hole is located between the air supply through hole and the first throttling exhaust port, and the second ventilation through hole is located between the air supply through hole and the second throttling exhaust port; A valve core is disposed within the ventilation chamber; along the axial direction of the ventilation chamber, the valve core slides and seals with the ventilation chamber to switch between a first ventilation position and a second ventilation position. When the valve core is switched to the first ventilation position, the air supply port is connected to the first ventilation port, and the second throttling exhaust port is connected to the second ventilation port, so that the gas supplied by the second ventilation port is discharged through the second throttling exhaust port, and the valve core moves from the first ventilation position to the second ventilation position; When the valve core is switched to the second ventilation position, the air supply port is connected to the second ventilation port, and the first throttling exhaust port is connected to the first ventilation port, so that the gas supplied by the first ventilation port is discharged through the first throttling exhaust port, and the valve core moves from the first ventilation position to the second ventilation position.

2. The pneumatic directional valve according to claim 1, characterized in that, Also includes: The first throttling muffler has one end disposed inside the first throttling exhaust hole and threadedly connected to the first throttling exhaust hole. The first throttling muffler is provided with a third throttling exhaust port, which is connected to the first throttling exhaust port; The second throttling muffler has one end disposed inside the second throttling exhaust hole and threadedly connected to the second throttling exhaust hole; the second throttling muffler is provided with a fourth throttling exhaust hole, which is connected to the second throttling exhaust hole.

3. The pneumatic directional valve according to claim 2, characterized in that: A first adjusting member is provided at the end of the first throttling muffler away from the valve body. The first adjusting member is connected to the first throttling muffler and is used to adjust the opening of the third throttling exhaust port. A second adjusting element is provided at the end of the second throttling muffler away from the valve body. The second adjusting element is connected to the second throttling muffler and is used to adjust the opening of the fourth throttling exhaust port.

4. The pneumatic directional valve according to claim 1, characterized in that, Also includes: Two end caps are disposed at both ends of the valve core along the axial direction of the valve core, and the end caps are connected to the valve core; Along the axial direction of the ventilation chamber, the end cap slides and seals with the ventilation chamber.

5. The pneumatic directional valve according to claim 4, characterized in that: The valve body is provided with a first adjustment through hole and a second adjustment through hole. Along the axial direction of the air exchange chamber, the first adjustment through hole and the second adjustment through hole are provided on both sides of the valve body, and the air exchange chamber is connected to the first adjustment through hole and the second adjustment through hole respectively. The pneumatic reversing valve further includes: a first pressing member and a second pressing member. The first pressing member passes through the first adjusting through hole along the axial direction of the air exchange chamber and is slidably connected to the first adjusting through hole. One end of the first pressing member is connected to the end cap at one end of the valve core. The second pressing member passes through the second adjusting through hole along the axial direction of the air exchange chamber and is slidably connected to the second adjusting through hole. One end of the second pressing member is connected to the end cap at the other end of the valve core.

6. The pneumatic directional valve according to claim 1, characterized in that: Along the axial direction of the valve core, the valve core has a first sealing groove at both ends, and a first sealing ring is provided in the first sealing groove; the two radial ends of the first sealing ring respectively abut and seal with the bottom surface of the first sealing groove and the inner wall surface of the ventilation chamber.

7. The pneumatic directional valve according to claim 1, characterized in that, Also includes: A bushing is disposed within the ventilation chamber, with its outer wall surface spaced apart from the inner wall surface of the ventilation chamber. The bushing is fitted over the middle of the valve core, with its inner wall surface spaced apart from the outer wall surface of the valve core. The bushing has multiple third ventilation holes, evenly spaced along its circumference. One end of each third ventilation hole communicates with the ventilation chamber, and the other end communicates with the space between the inner wall surface of the bushing and the outer wall surface of the valve core.

8. The pneumatic directional valve according to claim 7, characterized in that, Also includes: Along the axial direction of the bushing tube, a second sealing groove is provided at both ends of the bushing tube, and a second sealing ring is provided in the second sealing groove; the two radial ends of the second sealing ring abut against the bottom surface of the second sealing groove and the inner wall surface of the ventilation chamber, respectively, to seal.

9. A purely pneumatic emergency supply system, characterized in that, Includes the pneumatic directional valve as described in any one of claims 1 to 8.

10. A method for operating a pneumatic directional valve, applied to the pneumatic directional valve as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The valve core in the ventilation chamber of the valve body is switched to the first ventilation position, so that the air supply port is connected to the first ventilation port, and the second throttling exhaust port is connected to the second ventilation port, so that the gas supplied by the second ventilation port is discharged through the second throttling exhaust port; wherein, the valve body is provided with the second throttling exhaust port and the first throttling exhaust port; the first throttling exhaust port and the second throttling exhaust port are located at both ends of the axial direction of the ventilation chamber, and the ventilation chamber connects the first throttling exhaust port and the second throttling exhaust port; the cavity wall surface of the ventilation chamber is provided with... The air supply through-hole, the first air exchange through-hole, and the second air exchange through-hole are described. Along the axial direction of the air exchange chamber, the first air exchange through-hole is disposed between the air supply through-hole and the first throttling exhaust hole, and the second air exchange through-hole is disposed between the air supply through-hole and the second throttling exhaust hole. Along the axial direction of the air exchange chamber, the valve core slides and seals with the air exchange chamber to switch between a first air exchange position and a second air exchange position. When the valve core is switched to the first air exchange position, the valve core moves from the first air exchange position to the second air exchange position. The valve core is controlled to switch to the second ventilation position, so that the air supply port is connected to the second ventilation port, and the first throttling exhaust port is connected to the first ventilation port, so that the gas supplied by the first ventilation port is discharged through the first throttling exhaust port; wherein, when the valve core is switched to the second ventilation position, the valve core moves from the first ventilation position to the second ventilation position.

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