Valve structure based on differential pressure control, pressure regulating device and automatic pressure regulating system

Abstract

The utility model relates to a valve structure based on differential pressure control, pressure regulating device and automatic pressure regulating system, valve structure includes valve seat unit, valve core unit and telescopic unit. Its advantage lies in, utilize the inside and outside pressure difference of telescopic unit to control the position of valve core unit, control the valve opening pressure of valve core unit through the outside pressure of telescopic unit, need not manual close -range operation, since the valve opening pressure is mainly controlled through the pressure of external cavity, the performance of telescopic unit itself can be relatively improved, can bear higher pressure purging gas when carrying out purging, in the case where the outside of telescopic unit is not aerated, only adjust the internal pressure of telescopic unit can not make valve core unit movement, and the safety is higher.

Description

Technical Field

[0001] This utility model relates to the field of special gas pressure regulation technology, and relates to a valve structure, pressure regulating device and automatic pressure regulating system based on differential pressure control. Background Technology

[0002] When controlling a gas medium, a pressure regulator is usually used to adjust the gas pressure in the circuit to the working range to meet the requirements of the circuit.

[0003] Existing pressure regulating valves suffer from insufficient pressure regulating performance, poor stability, and poor accuracy. To address these issues, Chinese utility model patent CN214331508U discloses a bellows-type line pressure regulator. This regulator uses a handwheel assembly to deform a spring assembly, which in turn moves the bellows assembly, causing the push rod assembly to push the valve core assembly to change its position, thus altering the valve core assembly's opening. As the gas flow rate changes, the pressure in the regulating chamber also changes. Through the combined action of the valve core spring, bellows assembly, and spring assembly, a new pressure equilibrium is achieved at the outlet.

[0004] However, it has the following drawbacks: 1) The upper knob is designed to prevent the valve core from being turned down too much and becoming normally open due to the limit mechanism. However, this also fixes the valve core's opening pressure, requiring disassembly and adjustment to change the valve core's opening pressure. 2) The negative pressure extraction step requires manual adjustment of the knob, and the knob must also be manually turned off when the work is finished; 3) Since this structure relies on the displacement generated by the pressure difference between the upper and lower parts of the diaphragm to control the valve core to open the valve, and the maximum pressure difference between the upper and lower parts of this structure is only 14.7 psig, in order to have sufficient deformation displacement under this pressure difference, the diaphragm will be too soft, which will reduce the pressure resistance of the diaphragm itself. When the air pressure in the cavity is too high, the diaphragm will be damaged.

[0005] In summary, no effective solution has yet been proposed to address the existing problems of the inability to quickly and conveniently adjust the valve core opening pressure, the need for close-range manual operation leading to high risks, poor pressure resistance during purging processes, and the easy mis-opening of the valve core. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by providing a valve structure, pressure regulating device, and automatic pressure regulating system based on differential pressure control. This addresses the problems in related technologies, such as the inability to quickly and conveniently adjust the valve core's opening pressure, the need for close-range manual operation leading to high risks, poor pressure resistance during purging processes, and the easy mis-opening of the valve core.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, a valve structure based on differential pressure control is provided, comprising: Valve seat unit; A valve core unit, wherein the valve core unit is movably connected to the valve seat unit; The telescopic unit has the valve seat unit inside and is connected to the valve core unit. It is used to drive the valve core unit to move relative to the valve seat unit under the action of pressure difference so that the valve structure switches between the open state and the closed state.

[0008] In some embodiments, the valve seat unit includes: A valve seat element, wherein the telescopic unit is provided on the outside of the valve seat element; A first movable element is disposed through the bottom of the valve seat element and is movably connected to the valve core unit; The second movable element extends through the top of the valve seat element, communicates with the first movable element, and is movably connected to the telescopic unit.

[0009] In some embodiments, the valve seat unit further includes: A first connecting element is disposed on the outer edge surface of the bottom end of the valve seat element, for connecting the valve seat unit to other structures.

[0010] In some embodiments, the valve seat unit further includes: A first limiting element is disposed on the outer edge surface of the top end of the valve seat element, and is used to limit the position of the valve seat element when the valve seat unit is connected to other structures.

[0011] In some embodiments, the valve seat unit further includes: A first receiving element is disposed at the bottom end of the valve seat element and is used to accommodate other components.

[0012] In some embodiments, the valve core unit includes: A valve core element is connected to the telescopic unit and movably connected to the valve seat unit, and is used to move relative to the valve seat unit under the action of the telescopic unit so that the valve structure switches between an open state and a closed state.

[0013] In some embodiments, the valve core unit further includes: The second connecting element is disposed on the outer edge surface of the top end of the valve core element and is connected to the telescopic unit.

[0014] In some embodiments, the valve core unit further includes: The second limiting element is disposed at the bottom end of the valve core element and is used to limit the range of motion of the valve core element.

[0015] In some embodiments, the telescopic unit includes: A piston element is connected to the valve core unit and movably connected to the valve seat unit, used to drive the valve core unit to move relative to the valve seat unit so that the valve structure switches between an open state and a closed state. A telescopic element, wherein the valve seat unit is disposed inside the telescopic element and is connected to the piston element, for driving the piston element to move relative to the valve seat unit under the action of pressure difference.

[0016] In some embodiments, the telescopic unit further includes: A third connecting element is disposed inside the piston element and connected to the valve core unit.

[0017] In some embodiments, the telescopic unit further includes: The third limiting element is provided with the top end of the piston element and is connected to the telescopic element to prevent the piston element from separating from the telescopic element.

[0018] Secondly, a pressure regulating device based on differential pressure control is provided, comprising: Body structure; As described in the first aspect, the valve seat unit and the telescopic unit of the valve structure are respectively connected to the body structure, and are used to switch between an open state and a closed state under the action of pressure difference so that the body structure can switch between an open state and a closed state.

[0019] In some embodiments, the body structure includes: The body unit is connected to the valve seat unit and the telescopic unit respectively, and is used to switch between the open state and the closed state under the action of the valve core unit of the valve structure. A cover unit, wherein the cover unit is disposed at the top of the body unit; A first sealing unit is disposed between the body unit and the cover unit; The second sealing unit is disposed between the body unit and the valve seat unit.

[0020] In some embodiments, the body unit includes: The body component, wherein the valve structure is disposed inside the body component; A first cavity element is disposed inside the body element and connected to the valve seat unit; The second cavity element is disposed inside the body element and communicates with the first cavity element, and is connected to the bottom end of the telescopic unit; A first channel element is disposed through the body element and communicates with the first cavity element, for the purpose of allowing the valve core unit to move; The second channel element, which is disposed through the body element and communicates with the second cavity element, is used to allow gas to flow inside the telescopic unit; A third channel element, which extends through the body element and communicates with the second cavity element, is used to allow gas to flow outside the telescopic unit.

[0021] In some embodiments, the body unit further includes: A fourth channel element is disposed through the body element and communicates with the second cavity element for discharging gas.

[0022] In some embodiments, the body unit further includes: A fourth connecting element is disposed inside the first cavity element and connected to the valve seat unit.

[0023] In some of these embodiments, it also includes: A flow-limiting structure is provided at the bottom of the main body structure to limit the gas flow rate entering the main body structure.

[0024] In some embodiments, the current limiting structure includes: A flow-limiting element is disposed at the bottom of the main body structure to limit the gas flow rate entering the main body structure; A fourth limiting element is disposed at the bottom of the main body structure and abuts against and communicates with the current limiting element, and is used to limit the position of the current limiting element.

[0025] In some of these embodiments, it also includes: A flexible one-way structure is provided on the side of the main body structure to relieve pressure and prevent the valve structure from being in a normally open state.

[0026] In some embodiments, the body structure further includes: The second accommodating element is disposed on the side of the main body structure and connected to the elastic unidirectional structure; A fifth channel element is disposed through the body structure and communicates with the second accommodating element, for allowing gas to flow from the interior of the body structure through the fifth channel element to the second accommodating element.

[0027] In some embodiments, the body structure further includes: A fifth connecting element is disposed inside the second accommodating element and connected to the elastic unidirectional structure.

[0028] In some embodiments, the elastic unidirectional structure includes: A fixing element is disposed on the side of the main body structure and connected to the main body structure; A sixth channel element, which is disposed through the fixed element, is used to allow gas to flow outward through the sixth channel element; A sliding element is slidably disposed between the fixed element and the body structure, for closing or exposing the pressure relief channel of the body structure; At least one seventh channel element is provided, which is disposed through the sliding element, for allowing gas to flow outward sequentially through the seventh channel element and the sixth channel element; An elastic element is disposed between the fixed element and the sliding element, and is used to drive the sliding element to move relative to the fixed element under pressure.

[0029] In some embodiments, the elastic unidirectional structure further includes: A sixth connecting element is disposed on the outer edge surface of the fixing element and connected to the main body structure.

[0030] Thirdly, an automatic pressure regulating system based on differential pressure control is provided, comprising: The pressure regulating device as described in the second aspect; An automatic air intake device, which is connected to the main body structure, is used to control whether to supply gas to the main body structure; An automatic negative pressure device is connected to the main body structure and is used to control whether to provide negative pressure to the main body structure.

[0031] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: The position of the valve core unit is controlled by the pressure difference between the inside and outside of the telescopic unit. The opening pressure of the valve core unit is controlled by adjusting the external pressure of the telescopic unit, eliminating the need for close-range manual operation. Since the opening pressure is mainly controlled by the pressure of the external cavity, the performance of the telescopic unit itself can be relatively improved, allowing it to withstand higher pressure purging gas during purging. When the outside of the telescopic unit is not ventilated, adjusting only the internal pressure of the telescopic unit will not move the valve core unit, thus enhancing safety. Pressure control, purging, and gas discharge can be remotely operated via pneumatic devices (such as pneumatic valves), eliminating the need for close-range manual operation. During exhaust operations, the output pressure can be controlled via pneumatic devices (such as pneumatic valves), which is simple and convenient. The combination of the telescopic unit and the valve core unit achieves multiple seals, reducing the risk of leakage. There will be no gas leakage during transportation, making it safer. The adjustable elastic one-way structure can control the opening pressure of the elastic one-way structure. When the external cavity pressure of the telescopic unit increases excessively, the elastic one-way structure opens to release pressure, preventing the valve core unit from becoming normally open. Attached Figure Description

[0032] Figure 1 , Figure 2 , Figure 3 These are schematic diagrams of the valve structure according to embodiments of the present utility model; Figure 4 , Figure 5 , Figure 6 These are schematic diagrams of a pressure regulating device according to an embodiment of the present utility model; Figure 7 , Figure 8 , Figure 9 These are schematic diagrams of the main body structure according to embodiments of the present utility model; Figure 10 , Figure 11 These are schematic diagrams of the current limiting structure according to an embodiment of the present utility model; Figure 12 , Figure 13 These are schematic diagrams of the elastic unidirectional structure according to embodiments of the present utility model.

[0033] The reference numerals in the accompanying drawings are as follows: 100, valve seat unit; 101, valve seat element; 102, first movable element; 103, second movable element; 104, first limiting element; 105, first accommodating element; 200, valve core unit; 201, valve core element; 202, second limiting element; 300, telescopic unit; 301, piston element; 302, telescopic element; 303, third limiting element; 400, body unit; 401, body element; 402, first cavity element; 403, second cavity element; 404. First channel element; 405, Second channel element; 406, Third channel element; 407, Fourth channel element; 408, Second receiving element; 409, Fifth channel element; 500, Cover unit; 600, First sealing unit; 700, Second sealing unit; 800, Flow limiting unit; 801, Flow limiting element; 802, Fourth limiting element; 900, Elastic unidirectional unit; 901, Fixing element; 902, Sixth channel element; 903, Sliding element; 904, Seventh channel element; 905, Elastic element; A. Valve structure; B. Body structure; C. Flow limiting structure; D. One-way structure. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0037] Example 1 This embodiment relates to the valve structure of this utility model.

[0038] An illustrative embodiment of this utility model, such as Figures 1-3 As shown, a valve structure A based on differential pressure control includes a valve seat unit 100, a valve core unit 200, and a telescopic unit 300. The valve core unit 200 is movably connected to the valve seat unit 100. The telescopic unit 300 internally houses the valve seat unit 100 and is connected to the valve core unit 200. Under the influence of differential pressure, the telescopic unit 300 moves the valve core unit 200 relative to the valve seat unit 100, thereby switching the valve structure A between an open and closed state.

[0039] It should be noted that in this utility model, if the external pressure (generally positive pressure) of the telescopic unit 300 is greater than the internal pressure (generally negative pressure) of the telescopic unit 300, the telescopic unit 300 is compressed under the action of the internal and external pressure difference, causing the valve core unit 200 to move downward; if the internal pressure of the telescopic unit 300 gradually increases (i.e., changes from negative pressure to positive pressure), the internal and external pressure difference gradually decreases, the telescopic unit 300 is stretched, causing the valve core unit 200 to move upward; if the internal pressure of the telescopic unit 300 is equal to the external pressure, the internal and external pressure difference is 0, the telescopic unit 300 resets, causing the valve core unit 200 to move to the initial position.

[0040] like Figures 1-3 As shown, the valve seat unit 100 includes a valve seat element 101, a first movable element 102, and a second movable element 103. The valve seat element 101 has an external telescopic unit 300. The first movable element 102 passes through the bottom of the valve seat element 101 and is movably connected to the valve core unit 200. The second movable element 103 passes through the top of the valve seat element 101, communicates with the first movable element 102, and is movably connected to the telescopic unit 300.

[0041] Generally, the valve seat element 101 is roughly cylindrical in shape, usually a cylindrical structure.

[0042] Generally, the radial dimension (such as the outer diameter) of the valve seat element 101 remains consistent from its top end to its bottom end.

[0043] In some of these embodiments, the valve seat element 101 includes, but is not limited to, a valve seat.

[0044] The first movable element 102 is formed at the bottom of the valve seat element 101. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0045] The first movable element 102 is coaxially arranged with the valve seat element 101, that is, the axis of the first movable element 102 is collinear with the axis of the valve seat element 101.

[0046] Generally, the cross-section of the first movable element 102 is approximately circular. Alternatively, it can be other shapes, such as rectangles, as long as they allow the valve core unit 200 to move along the first movable element 102.

[0047] Generally, the radial dimension (e.g., diameter) of the first movable element 102 is smaller than the radial dimension (e.g., outer diameter) of the valve seat element 101, and the axial dimension (e.g., height) of the first movable element 102 is smaller than the axial dimension (e.g., height) of the valve seat element 101.

[0048] In some of these embodiments, the first movable element 102 includes, but is not limited to, a movable hole, a movable groove, a movable cavity, a guide groove, a guide hole, a guide cavity, etc.

[0049] The second moving element 103 is formed on the top of the valve seat element 101. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0050] The second movable element 103 is coaxially arranged with the valve seat element 101, that is, the axis of the second movable element 103 is collinear with the axis of the valve seat element 101.

[0051] Generally, the cross-section of the second movable element 103 is approximately circular. Alternatively, it can be other shapes, such as rectangles, as long as they allow the telescopic unit 300 to move along the second movable element 103.

[0052] Generally, the longitudinal section of the second movable element 103 is roughly rectangular. Alternatively, it can be other shapes, such as trapezoids, as long as it allows the telescopic unit 300 to move along the second movable element 103.

[0053] Generally, the radial dimension (e.g., diameter) of the second movable element 103 is smaller than the radial dimension (e.g., outer diameter) of the valve seat element 101, and the axial dimension (e.g., height) of the second movable element 103 is smaller than the axial dimension (e.g., height) of the valve seat element 101.

[0054] Generally, the radial dimension (e.g., diameter) of the second movable element 103 is not less than the radial dimension (e.g., diameter) of the first movable element 102, and the axial dimension (e.g., height) of the second movable element 103 is not less than the axial dimension (e.g., height) of the first movable element 102.

[0055] Preferably, the axial dimension (e.g., height) of the second movable element 103 is greater than the axial dimension (e.g., height) of the first movable element 102.

[0056] Generally, the sum of the axial dimension of the second movable element 103 and the axial dimension of the first movable element 102 is equal to the axial dimension of the valve seat element 101.

[0057] Generally, the radial dimension (e.g., diameter) of the second active element 103 remains consistent from its top end to its bottom end.

[0058] In some of these embodiments, the radial dimension (e.g., diameter) of the second active element 103 decreases from its top end to its bottom end.

[0059] In some embodiments, the second movable element 103 and the first movable element 102 form a structure with a longitudinal section of a first rectangle – an isosceles trapezoid (wider at the top and narrower at the bottom) – a second rectangle, wherein the width of the second rectangle is less than the width of the first rectangle, and the height of the second rectangle is less than the height of the first rectangle.

[0060] In some of these embodiments, the second movable element 103 includes, but is not limited to, movable holes, movable slots, movable cavities, guide slots, guide holes, guide cavities, etc.

[0061] Furthermore, the valve seat unit 100 also includes a first limiting element 104. The first limiting element 104 is disposed on the outer edge surface of the top end of the valve seat element 101 and is used to limit the position of the valve seat element 101 when the valve seat unit 100 is connected to other structures.

[0062] The first limiting element 104 is formed on the outer edge surface of the top end of the valve seat element 101. Generally, it is obtained by machining methods (such as punching).

[0063] Generally, the radial dimension (e.g., outer diameter) of the first limiting element 104 is greater than the radial dimension (e.g., outer diameter) of the valve seat element 101, and the axial dimension (e.g., height) of the first limiting element 104 is less than the axial dimension (e.g., height) of the valve seat element 101.

[0064] That is, the first limiting element 104 and the valve seat element 101 form a T-shaped structure.

[0065] In some of these embodiments, the first limiting element 104 includes, but is not limited to, a limiting plate, a limiting ring, etc.

[0066] Furthermore, the valve seat unit 100 also includes a first receiving element 105. The first receiving element 105 is disposed at the bottom end of the valve seat element 101 and is used to accommodate other components.

[0067] The first receiving element 105 is formed at the bottom end of the valve seat element 101 and is not connected to the first moving element 102. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0068] Generally, the radial dimension (e.g., outer diameter) of the first receiving element 105 is smaller than the radial dimension (e.g., outer diameter) of the valve seat element 101, and the axial dimension (e.g., depth) of the first receiving element 105 is smaller than the axial dimension (e.g., height) of the valve seat element 101.

[0069] Generally, the radial dimension (e.g., inner diameter) of the first accommodating element 105 is greater than the radial dimension (e.g., diameter) of the first movable element 102.

[0070] Generally, the radial dimension (e.g., diameter) of the first accommodating element 105 remains consistent from its top end to its bottom end.

[0071] In some embodiments, the radial dimension (e.g., diameter) of the first receiving element 105 increases from its top end to its bottom end. For example, the outer diameter of the first receiving element 105 remains constant, while the inner diameter of the first receiving element 105 increases from its top end to its bottom end.

[0072] In some of these embodiments, the first receiving element 105 includes, but is not limited to, a receiving cavity, a receiving groove, a mounting groove, etc.

[0073] Furthermore, the valve seat unit 100 also includes a first connecting element. The first connecting element is disposed on the outer edge surface of the bottom end of the valve seat unit 101, and is used to connect the valve seat unit 100 to other structures.

[0074] The first connecting element is formed on the outer edge surface of the bottom end of the valve seat element 101. Generally, it is obtained by machining methods (such as turning, milling, grinding, threading, etc.).

[0075] Generally, the axial dimension (e.g., height) of the first connecting element is smaller than the axial dimension (e.g., height) of the valve seat element 101.

[0076] Preferably, the axial dimension (e.g., height) of the first connecting element is less than the difference between the axial dimension (e.g., height) of the valve seat element 101 and the axial dimension (e.g., height) of the first limiting element 104.

[0077] In some of these embodiments, the first connecting element includes, but is not limited to, threads.

[0078] like Figures 1-3 As shown, the valve core unit 200 includes a valve core element 201. The valve core element 201 is connected to the telescopic unit 300 and movably connected to the valve seat unit 100, and is used to move relative to the valve seat unit 100 under the action of the telescopic unit 300 so that the valve structure A switches between the open state and the closed state.

[0079] Specifically, the valve core element 201 is movably disposed on the first movable element 102.

[0080] Generally, the valve core element 201 is roughly cylindrical in shape, usually a cylindrical structure.

[0081] Generally, the radial dimension (such as the outer diameter) of the valve core element 201 remains consistent from its top end to its bottom end.

[0082] Generally, the radial dimension (e.g., diameter) of the valve core element 201 is not greater than the radial dimension (e.g., diameter) of the first movable element 102, and the axial dimension (e.g., height) of the valve core element 201 is greater than the axial dimension (e.g., height) of the first movable element 102.

[0083] In some embodiments, the axial dimension (e.g., height) of the valve core element 201 is not less than the axial dimension (e.g., height) of the valve seat element 101. Preferably, the axial dimension (e.g., height) of the valve core element 201 is greater than the axial dimension (e.g., height) of the valve seat element 101.

[0084] In some of these embodiments, valve core element 201 includes, but is not limited to, a valve core.

[0085] Furthermore, the valve core unit 200 also includes a second limiting element 202. The second limiting element 202 is disposed at the bottom end of the valve core element 201 and is used to limit the range of motion of the valve core element 201.

[0086] It should be noted that the second limiting element 202 can prevent the valve core element 201 from entering the first moving element 102 completely.

[0087] The second limiting element 202 is formed on the outer edge surface of the bottom end of the valve core element 201. Generally, it is obtained by machining methods (such as punching).

[0088] Generally, the radial dimension (e.g., outer diameter) of the second limiting element 202 is greater than the radial dimension (e.g., outer diameter) of the valve seat element 101, and the axial dimension (e.g., height) of the second limiting element 202 is less than the axial dimension (e.g., height) of the valve seat element 101.

[0089] Generally, the radial dimension (e.g., diameter) of the second limiting element 202 remains consistent from its top end to its bottom end.

[0090] In some of these embodiments, the radial dimension (e.g., diameter) of the second limiting element 202 increases from its top end to its bottom end.

[0091] In some of these embodiments, the second limiting element 202 includes, but is not limited to, a limiting plate, a limiting ring, etc.

[0092] Furthermore, the valve core unit 200 also includes a second connecting element. The second connecting element is disposed on the outer edge surface of the top end of the valve core unit 201 and is connected to the telescopic unit 300.

[0093] The second connecting element is formed on the outer edge surface of the top end of the valve core element 201. Generally, it is obtained by machining methods (such as turning, milling, grinding, threading, etc.).

[0094] Generally, the axial dimension (e.g., height) of the second connecting element is smaller than the axial dimension (e.g., height) of the valve core element 201.

[0095] In some of these embodiments, the second connecting element includes, but is not limited to, threads.

[0096] like Figures 1-3 As shown, the telescopic unit 300 includes a piston element 301 and a telescopic element 302. The piston element 301 is connected to the valve core unit 200 and movably connected to the valve seat unit 100, used to drive the valve core unit 200 to move relative to the valve seat unit 100, thereby switching the valve structure A between an open and closed state. The telescopic element 302 has the valve seat unit 100 internally disposed and is connected to the piston element 301, used to drive the piston element 301 to move relative to the valve seat unit 100 under the action of pressure difference.

[0097] Specifically, the piston element 301 is connected to the valve core element 201 and is movably disposed on the second movable element 103.

[0098] It should be noted that the piston element 301 and the valve core element 201 are detachably connected, including but not limited to threaded connections, snap-fit ​​connections, etc.

[0099] It should be noted that the piston element 301 can be a solid structure or a hollow structure. Preferably, the piston element 301 is a hollow structure.

[0100] Generally, the piston element 301 is roughly cylindrical in shape, usually a cylindrical structure.

[0101] Generally, the radial dimension (such as the outer diameter) of the piston element 301 remains consistent from its top end to its bottom end.

[0102] In some of these embodiments, the radial dimension (e.g., outer diameter) of the piston element 301 decreases from its top end to its bottom end.

[0103] Generally, the radial dimension (e.g., diameter) of the piston element 301 is not greater than the radial dimension (e.g., diameter) of the second movable element 103, and the axial dimension (e.g., height) of the piston element 301 is not less than the axial dimension (e.g., height) of the second movable element 103.

[0104] In some of these embodiments, piston element 301 includes, but is not limited to, a piston.

[0105] It should be noted that the telescopic element 302 and the piston element 301 are fixedly connected or detachably connected, including but not limited to welding, bonding, hot melt butt welding, electrofusion connection, etc.

[0106] It should be noted that the telescopic element 302 has a hollow structure.

[0107] Generally, the radial dimension (e.g., inner diameter) of the telescopic element 302 is greater than the radial dimension (e.g., outer diameter) of the valve seat element 101, and the axial dimension (e.g., height) of the telescopic element 302 is greater than the axial dimension (e.g., height) of the valve seat element 101.

[0108] Generally, when the telescopic element 302 is in a compressed state, the axial dimension (such as height) of the telescopic element 302 is still greater than the axial dimension (such as height) of the valve seat element 101.

[0109] Generally, the radial dimension (e.g., inner diameter) of the telescopic element 302 is equal to the radial dimension (e.g., diameter) of the piston element 301.

[0110] It should be noted that the telescopic element 302 has a first inner diameter and a second inner diameter. The first inner diameter is larger than the outer diameter of the valve seat element 101; the second inner diameter is equal to the outer diameter of the piston element 301 and smaller than the first inner diameter.

[0111] In some embodiments, the telescopic element 302 includes, but is not limited to, a bellows, which can be a metal bellows or a plastic bellows. Preferably, the telescopic element 302 is a metal bellows.

[0112] Furthermore, the telescopic unit 300 also includes a third limiting element 303. The third limiting element 303 is provided with the top end of the piston element 301 and is connected to the telescopic element 302 to prevent the piston element 301 from separating from the telescopic element 302.

[0113] The third limiting element 303 is formed on the outer edge surface of the top end of the piston element 301. Generally, it is obtained by machining methods (such as punching).

[0114] It should be noted that the top end of the third limiting element 303 is fixedly connected or detachably connected to the top end of the telescopic element 302, including but not limited to welding, bonding, hot melt butt welding, electrofusion connection, etc.

[0115] Generally, the radial dimension (e.g., outer diameter) of the third limiting element 303 is greater than the radial dimension (e.g., outer diameter) of the piston element 301, and the axial dimension (e.g., height) of the third limiting element 303 is less than the axial dimension (e.g., height) of the piston element 301.

[0116] That is, the third limiting element 303 and the piston element 301 form a T-shaped structure.

[0117] Generally, the radial dimension (e.g., outer diameter) of the third limiting element 303 is greater than the radial dimension (e.g., second inner diameter) of the telescopic element 302.

[0118] In some of these embodiments, the third limiting element 303 includes, but is not limited to, a limiting plate, a limiting ring, etc.

[0119] In some embodiments, the telescopic unit 300 further includes a third connecting element. This third connecting element is disposed inside the piston element 301 and connected to the valve core unit 200.

[0120] The third connecting element is formed inside the piston element 301. Generally, it is obtained by machining methods (such as turning, milling, grinding, threading, etc.).

[0121] Generally, the axial dimension (e.g., height) of the third connecting element is smaller than the axial dimension (e.g., height) of the valve core element 201.

[0122] In some of these embodiments, the third connecting element includes, but is not limited to, threads.

[0123] The method of using this utility model is as follows: Install valve structure A in the preset position; If the external pressure (generally positive pressure) of the telescopic element 302 is greater than the internal pressure (generally negative pressure) of the telescopic element 302, the telescopic element 302 is compressed under the action of the internal and external pressure difference, and the piston element 301 drives the valve core element 201 to move downward, so that the valve structure A is in the open state. When valve structure A is in the open state, the position of valve core element 201 can be controlled by adjusting the internal and external pressure difference of telescopic element 302; if the internal and external pressure difference is large, the position of valve core element 201 is lower; if the internal and external pressure difference is small, the position of valve core element 201 is higher. If the internal pressure of the telescopic element 302 gradually increases (i.e., changes from negative pressure to positive pressure), the pressure difference between the inside and outside gradually decreases, the telescopic element 302 is stretched, and the piston element 301 drives the valve core element 201 to move upward. If the internal pressure of the telescopic element 302 is equal to the external pressure and the internal and external pressure difference is 0, the telescopic element 302 resets and drives the valve core element 201 to move to the initial position through the piston element 301, so that the valve structure B is in the closed state.

[0124] The technical advantages of this invention are as follows: the position of the valve core unit is controlled by the internal and external pressure difference of the telescopic unit, and the valve opening pressure of the valve core unit is controlled by adjusting the external pressure of the telescopic unit, eliminating the need for close-range manual operation; since the valve opening pressure is mainly controlled by the pressure of the external cavity, the performance of the telescopic unit itself can be relatively improved, and it can withstand higher pressure purging gas during purging; when the external air of the telescopic unit is not ventilated, adjusting only the internal pressure of the telescopic unit cannot move the valve core unit, thus enhancing safety.

[0125] Example 2 This embodiment relates to the voltage regulating device of this utility model.

[0126] An illustrative embodiment of this utility model, such as Figures 4-6 As shown, a pressure regulating device based on differential pressure control includes a valve structure A and a body structure B as described in Embodiment 1. The valve seat unit 100 and the telescopic unit 300 of the valve structure A are respectively connected to the body structure B, and are used to switch between an open state and a closed state under the action of differential pressure, thereby switching the body structure B between the open state and the closed state.

[0127] It should be noted that valve structure A and body structure B together form a pressure regulating valve. That is, body structure B is the valve body structure.

[0128] It should be noted that the switching between the open and closed states of the main body structure B refers to the switching between the open and closed states of the voltage regulating device.

[0129] like Figures 7-9 As shown, the main body structure B includes a main body unit 400, a cover unit 500, a first sealing unit 600, and a second sealing unit 700. The main body unit 400 is connected to the valve seat unit 100 and the telescopic unit 300, respectively, and is used to switch between an open and closed state under the action of the valve core unit 200 of the valve structure A. The cover unit 500 is disposed at the top of the main body unit 400. The first sealing unit 600 is disposed between the main body unit 400 and the cover unit 500. The second sealing unit 700 is disposed between the main body unit 400 and the valve seat unit 100.

[0130] It should be noted that the body unit 400 is the valve body unit; the cover unit 500 is the valve cover unit.

[0131] It should be noted that the cover unit 500 is detachably connected to the body unit 400, including but not limited to threaded connections and bolted connections. For example, it can be tightened by tightening a nut.

[0132] In some of these embodiments, the cover unit 500 includes, but is not limited to, a valve cover.

[0133] It should be noted that the first sealing unit 600 is located between the inner side of the top of the main body unit 400 and the outer side of the bottom of the cover unit 500 to prevent air leakage.

[0134] In some of these embodiments, the first sealing unit 600 includes, but is not limited to, a sealing ring.

[0135] It should be noted that the second sealing unit 700 is disposed on the first accommodating element 105 and fitted with the valve core element 201 (second limiting element 202).

[0136] It should be noted that the shape of the second sealing unit 700 matches the shape of the first accommodating element 105, the shape of the valve core element 201, and the shape of the second limiting element 202.

[0137] In some of these embodiments, the second sealing unit 700 includes, but is not limited to, a sealing ring.

[0138] like Figures 7-9 As shown, the body unit 400 includes a body element 401, a first cavity element 402, a second cavity element 403, a first channel element 404, a second channel element 405, and a third channel element 406. The body element 401 houses a valve structure A. The first cavity element 402 is located inside the body element 401 and connected to the valve seat unit 100. The second cavity element 403 is located inside the body element 401, communicates with the first cavity element 402, and is connected to the bottom end of the telescopic unit 300. The first channel element 404 penetrates the body element 401 and communicates with the first cavity element 402, providing movement for the valve core unit 200. The second channel element 405 penetrates the body element 401 and communicates with the second cavity element 403, allowing gas to flow inside the telescopic unit 300. The third channel element 406 penetrates the body element 401 and communicates with the second cavity element 403, allowing gas to flow outside the telescopic unit 300.

[0139] Specifically, the first cavity element 402 is connected to the valve seat element 101; the second cavity element 403 is connected to the bottom end of the telescopic element 302; and the first channel element 404 is movably provided with the valve core element 201.

[0140] Generally, the body element 401 is roughly cylindrical in shape, usually a cylindrical structure.

[0141] Generally, the radial dimension (such as the outer diameter) of the body element 401 remains consistent from its top end to its bottom end.

[0142] In some of these embodiments, the body element 401 includes, but is not limited to, a valve body.

[0143] The first cavity element 402 is formed in the middle of the interior of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0144] The first cavity element 402 is coaxially arranged with the main body element 401, that is, the axis of the first cavity element 402 is collinear with the axis of the main body element 401.

[0145] It should be noted that the first cavity element 402 is detachably connected to the valve seat element 101, including but not limited to threaded connections.

[0146] Generally, the cross-section of the first cavity element 402 is approximately circular. However, it can also be other shapes, such as rectangles, as long as they allow the valve seat element 101 to be fixed to the first cavity element 402.

[0147] Generally, the radial dimension (e.g., diameter) of the first cavity element 402 is equal to the radial dimension (e.g., outer diameter) of the valve seat element 101, and the axial dimension (e.g., height) of the first cavity element 402 is less than the axial dimension (e.g., height) of the valve seat element 101.

[0148] Generally, the radial dimension (e.g., diameter) of the first cavity element 402 is smaller than the radial dimension (e.g., outer diameter) of the first limiting element 104.

[0149] In some of these embodiments, the first cavity element 402 includes, but is not limited to, a mounting cavity, a receiving cavity, a placement cavity, etc.

[0150] The second cavity element 403 is formed in the middle of the interior of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0151] The second cavity element 403 is coaxially arranged with the main body element 401, that is, the axis of the second cavity element 403 is collinear with the axis of the main body element 401.

[0152] It should be noted that the second cavity element 403 and the telescopic element 302 are fixedly connected or detachably connected, including but not limited to welding, bonding, hot melt butt welding, electrofusion connection, etc.

[0153] It should be noted that when the cover unit 500 is installed on the body element 401, the top end of the second cavity element 403 is sealed by the cover unit 500.

[0154] Generally, the cross-section of the second cavity element 403 is approximately circular. Alternatively, it can be other shapes, such as rectangles, as long as it allows the telescopic element 302 to be fixed to the second cavity element 403, the telescopic element 302 to extend and retract freely, and a gas flow channel to be formed between the second cavity element 403 and the telescopic element 302.

[0155] Generally, the radial dimension (e.g., diameter) of the second cavity element 403 is greater than the radial dimension (e.g., outer diameter) of the telescopic element 302, and the axial dimension (e.g., height) of the second cavity element 403 is greater than the axial dimension (e.g., height) of the telescopic element 302.

[0156] In some of these embodiments, the second cavity element 403 includes, but is not limited to, a mounting cavity, a receiving cavity, a placement cavity, etc.

[0157] The first channel element 404 is formed at the bottom of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0158] The first channel element 404 is coaxially arranged with the body element 401, that is, the axis of the first channel element 404 is collinear with the axis of the body element 401.

[0159] Generally, the cross-section of the first channel element 404 is approximately circular. However, it can also be other shapes, such as rectangles, as long as they allow gas flow.

[0160] Generally, the radial dimension (e.g., diameter) of the first channel element 404 is smaller than the radial dimension (e.g., outer diameter) of the body element 401, and the axial dimension (e.g., height) of the first channel element 404 is smaller than the axial dimension (e.g., height) of the body element 401.

[0161] Generally, the radial dimension (e.g., diameter) of the first channel element 404 is smaller than the radial dimension (e.g., outer diameter) of the first cavity element 402.

[0162] Generally, the radial dimension (e.g., diameter) of the first channel element 404 is not less than the radial dimension (e.g., diameter) of the second limiting element 202.

[0163] In some of these embodiments, the first channel element 404 includes, but is not limited to, a vent hole, a vent groove, a vent cavity, etc.

[0164] The second channel element 405 is formed on the side of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0165] Generally, the cross-section of the second channel element 405 is approximately circular. However, it can also be other shapes, such as rectangles, as long as they allow gas flow.

[0166] Generally, the radial dimension (e.g., diameter) of the second channel element 405 is smaller than the radial dimension (e.g., outer diameter) of the body element 401, and the axial dimension (e.g., height) of the second channel element 405 is smaller than the axial dimension (e.g., height) of the body element 401.

[0167] Generally, the radial dimension (e.g., diameter) of the second channel element 405 is smaller than the radial dimension (e.g., outer diameter) of the second cavity element 403.

[0168] In some embodiments, the second channel element 405 includes a first vertical channel and a first horizontal channel. The first vertical channel is connected to the second cavity element 403; the first end of the second horizontal channel is connected to the bottom end of the first vertical channel, and the second end of the second horizontal channel passes through the side of the body element 401.

[0169] Generally, the axis of the first vertical channel is parallel to the axis of the second cavity element 403.

[0170] Generally, the axis of the first transverse channel is perpendicular to the axis of the body element 401.

[0171] In some of these embodiments, the second channel element 405 includes, but is not limited to, a vent hole, a vent groove, a vent cavity, etc.

[0172] The third channel element 406 is formed on the side of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0173] Generally, the cross-section of the third channel element 406 is approximately circular. However, it can also be other shapes, such as rectangles, as long as they allow gas flow.

[0174] Generally, the axis of the third channel element 406 is perpendicular to the axis of the body element 401.

[0175] Generally, the radial dimension (e.g., diameter) of the third channel element 406 is smaller than the radial dimension (e.g., outer diameter) of the body element 401, and the axial dimension (e.g., height) of the third channel element 406 is smaller than the axial dimension (e.g., height) of the body element 401.

[0176] Generally, the radial dimension (e.g., diameter) of the third channel element 406 is smaller than the radial dimension (e.g., outer diameter) of the second cavity element 403.

[0177] In some of these embodiments, the third channel element 406 includes, but is not limited to, a vent hole, a vent groove, a vent cavity, etc.

[0178] Furthermore, the body unit 400 also includes a fourth channel element 407. The fourth channel element 407 is disposed through the body element 401 and communicates with the second cavity element 403 for discharging gas.

[0179] The fourth channel element 407 is formed on the side of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0180] Generally, the cross-section of the fourth channel element 407 is approximately circular. However, it can also be other shapes, such as rectangles, as long as they allow gas flow.

[0181] Generally, the radial dimension (e.g., diameter) of the fourth channel element 407 is smaller than the radial dimension (e.g., outer diameter) of the body element 401, and the axial dimension (e.g., height) of the fourth channel element 407 is smaller than the axial dimension (e.g., height) of the body element 401.

[0182] Generally, the radial dimension (e.g., diameter) of the fourth channel element 407 is smaller than the radial dimension (e.g., outer diameter) of the first cavity element 402.

[0183] In some embodiments, the fourth channel element 407 includes a second vertical channel and a second horizontal channel. The second vertical channel is connected to the second cavity element 403; the first end of the second horizontal channel is connected to the bottom end of the second vertical channel, and the second end of the second horizontal channel passes through the side of the body element 401.

[0184] Generally, the axis of the second vertical channel is parallel to the axis of the second cavity element 403.

[0185] Generally, the axis of the second transverse channel is perpendicular to the axis of the body element 401.

[0186] In some of these embodiments, the fourth channel element 407 is symmetrically arranged with respect to the second channel element 405.

[0187] In some of these embodiments, the fourth channel element 407 includes, but is not limited to, a vent hole, a vent groove, a vent cavity, etc.

[0188] Furthermore, the body unit 400 also includes a fourth connecting element. The fourth connecting element is disposed inside the first cavity element 402 and is connected to the valve seat unit 100.

[0189] Specifically, the fourth connecting element is detachably connected to the first connecting element.

[0190] The fourth connecting element is formed inside the first cavity element 402. Generally, it is obtained by machining methods (such as turning, milling, grinding, threading, etc.).

[0191] Generally, the axial dimension (e.g., height) of the fourth connecting element is smaller than the axial dimension (e.g., height) of the first cavity element 402.

[0192] In some embodiments, the fourth connecting element includes, but is not limited to, threads.

[0193] Furthermore, the pressure regulating device also includes a flow limiting structure C. The flow limiting structure C is located at the bottom of the main body structure B and is used to limit the gas flow rate entering the main body structure B.

[0194] like Figures 10-11 As shown, the flow-limiting structure C includes at least a flow-limiting unit 800. The flow-limiting unit 800 is located at the bottom of the main body structure B and is used to limit the gas flow rate entering the main body structure B.

[0195] Specifically, the flow limiting unit 800 is located at the bottom of the main body unit 400 and is used to limit the gas flow rate entering the main body unit 400.

[0196] like Figures 10-11As shown, the flow limiting unit 800 includes a flow limiting element 801 and a fourth limiting element 802. The flow limiting element 801 is disposed at the bottom of the main body structure B and is used to limit the gas flow rate entering the main body structure B; the fourth limiting element 802 is disposed at the bottom of the main body structure B and abuts against and communicates with the flow limiting element 801, and is used to limit the position of the flow limiting element 801.

[0197] Specifically, the flow limiting element 801 is disposed inside the first channel element 404 to limit the gas flow rate entering the first channel element 404; the fourth limiting element 802 is disposed inside the first channel element 404.

[0198] It should be noted that the current limiting element 801 is fixedly connected to the first channel element 404 or detachably connected, including but not limited to threaded connections.

[0199] Generally, the current limiting element 801 is roughly cylindrical in shape, usually a cylindrical structure.

[0200] Generally, the radial dimension (such as the outer diameter) of the current limiting element 801 remains consistent from its top end to its bottom end.

[0201] In some of these embodiments, the radial dimension (e.g., outer diameter) of the current-limiting element 801 increases from its top end to its bottom end.

[0202] Generally, the radial dimension (e.g., diameter) of the current limiting element 801 is not greater than the radial dimension (e.g., diameter) of the first channel element 404, and the axial dimension (e.g., height) of the current limiting element 801 is greater than the axial dimension (e.g., height) of the first channel element 404.

[0203] In some embodiments, the flow-limiting element 801 includes a flow-limiting body, a first gas channel element, and at least one second gas channel element. The flow-limiting body is disposed inside the first channel element 404; the first gas channel element extends through the top and bottom of the flow-limiting body for gas flow; the second gas channel element is disposed at the top of the flow-limiting body and communicates with the first gas channel element for gas flow.

[0204] In some embodiments, there are multiple second gas passage elements. These multiple second gas passage elements are arranged around the flow-limiting body element.

[0205] In some of these embodiments, the current limiting element 801 includes, but is not limited to, a current limiter.

[0206] It should be noted that the fourth limiting element 802 is fixedly connected to the first channel element 404 or detachably connected, including but not limited to threaded connection, welding, etc. For example, a threaded connection can be made first, and then welding can be performed.

[0207] Generally, the fourth limiting element 802 is roughly cylindrical in shape, usually a cylindrical structure.

[0208] Generally, the radial dimension (such as the outer diameter) of the fourth limiting element 802 remains consistent from its top end to its bottom end.

[0209] In some of these embodiments, the radial dimension (e.g., outer diameter) of the fourth limiting element 802 increases from its top end to its bottom end.

[0210] It should be noted that the fourth limiting element 802 has a hollow structure. Specifically, the fourth limiting element 802 includes a limiting body and a third gas channel. The limiting body is disposed inside the first channel element 404 and abuts against the flow limiting element 801; the third gas channel is disposed through the top and bottom ends of the limiting body for gas flow.

[0211] Generally, the radial dimension (e.g., diameter) of the third gas passage component is equal to the radial dimension (e.g., diameter) of the first gas passage component.

[0212] In some of these embodiments, the fourth limiting element 802 includes, but is not limited to, a limiting post, a limiting block, etc.

[0213] Furthermore, the pressure regulating device also includes a flexible one-way structure D. The flexible one-way structure D is located on the side of the main body structure B and is used to relieve pressure to prevent the valve structure A from being in a normally open state.

[0214] Furthermore, the body unit 400 also includes a second accommodating element 408 and a fifth channel element 409. The second accommodating element 408 is disposed on the side of the body structure B and connected to the elastic unidirectional structure D; the fifth channel element 409 is disposed through the body structure B and communicates with the second accommodating element 408, for allowing gas to flow from the interior of the body structure B through the fifth channel element 409 to the second accommodating element 408.

[0215] Specifically, the second accommodating element 408 is disposed on the side of the body element 401; the fifth channel element 409 is disposed through the body structure and is connected to the second cavity element 403 and the second accommodating element 408 respectively.

[0216] The second receiving element 408 is formed on the side of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0217] Generally, the axis of the second accommodating element 408 is perpendicular to the axis of the body element 401.

[0218] Generally, the radial dimension (e.g., diameter) of the second accommodating element 408 is smaller than the radial dimension (e.g., outer diameter) of the body element 401, and the axial dimension (e.g., height) of the second accommodating element 408 is smaller than the axial dimension (e.g., height) of the body element 401.

[0219] Generally, the radial dimension (e.g., diameter) of the second accommodating element 408 is smaller than the radial dimension (e.g., outer diameter) of the second cavity element 403.

[0220] Generally, the radial dimension (e.g., diameter) of the second accommodating element 408 remains consistent from one end to the other.

[0221] In some of these embodiments, the radial dimension (e.g., diameter) of the second accommodating element 408 decreases from its outer end to its inner end.

[0222] In some embodiments, the second accommodating element 408 includes an extension, a first accommodating element, and a second accommodating element. The extension is disposed on the side of the body element 401; the first accommodating element is disposed inside the extension and connected to the elastic unidirectional structure D; the second accommodating element is disposed on the side of the body element 401 and communicates with the fifth channel element 409 and the first accommodating element, respectively, and is also connected to the elastic unidirectional structure D.

[0223] It should be noted that the extension has a ring structure.

[0224] Generally, the radial dimension (e.g., diameter) of the first receiving element is smaller than the outer diameter of the extension element.

[0225] Generally, the radial dimension (e.g., diameter) of the second receiving member is smaller than the radial dimension (e.g., diameter) of the first receiving member.

[0226] In some of these embodiments, the second receiving element 408 includes, but is not limited to, a receiving cavity, a receiving groove, a mounting groove, etc.

[0227] The fifth channel element 409 is formed on the side of the body element 401. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0228] Generally, the cross-section of the fifth channel element 409 is approximately circular. However, it can also be other shapes, such as rectangles, as long as they allow gas flow.

[0229] Generally, the axis of the fifth channel element 409 is perpendicular to the axis of the body element 401, and the axis of the fifth channel element 409 is collinear with the axis of the second accommodating element 408.

[0230] Generally, the radial dimension (e.g., diameter) of the fifth channel element 409 is smaller than the radial dimension (e.g., outer diameter) of the body element 401, and the axial dimension (e.g., height) of the fifth channel element 409 is smaller than the axial dimension (e.g., height) of the body element 401.

[0231] Generally, the radial dimension (e.g., diameter) of the fifth channel element 409 is smaller than the radial dimension (e.g., outer diameter) of the second cavity element 403.

[0232] In some of these embodiments, the fifth channel element 409 includes, but is not limited to, a vent hole, a vent groove, a vent cavity, etc.

[0233] Furthermore, the body unit 400 also includes a fifth connecting element. The fifth connecting element is disposed inside the second accommodating element 408 and is connected to the elastic unidirectional structure D.

[0234] The fifth connecting element is formed inside the second accommodating element 408. Generally, it is obtained by machining methods (such as turning, milling, grinding, threading, etc.).

[0235] Generally, the axial dimension (e.g., length) of the fifth connecting element is smaller than the axial dimension (e.g., length) of the second accommodating element 408 (extension).

[0236] In some embodiments, the fifth connecting element includes, but is not limited to, threads.

[0237] like Figures 12-13 As shown, the elastic unidirectional structure D includes at least an elastic unidirectional unit 900. The elastic unidirectional unit 900 is located on the side of the main body structure B and is used for pressure relief to prevent the valve structure A from being in a normally open state.

[0238] Specifically, the flexible unidirectional unit 900 is disposed on the side of the main body unit 400.

[0239] like Figures 12-13 As shown, the elastic unidirectional unit 900 includes a fixed element 901, a sixth channel element 902, a sliding element 903, at least one seventh channel element 904, and an elastic element 905. The fixed element 901 is disposed on the side of the main body structure B and connected to it. The sixth channel element 902 passes through the fixed element 901 and is used to allow gas to flow outward through the sixth channel element 902. The sliding element 903 is slidably disposed between the fixed element 901 and the main body structure B, and is used to close or expose the pressure relief channel of the main body structure B. The seventh channel element 904 passes through the sliding element 903 and is used to allow gas to flow outward sequentially through the seventh channel element 904 and the sixth channel element 902. The elastic element 905 is disposed between the fixed element 901 and the sliding element 903, and is used to drive the sliding element 903 to move relative to the fixed element 901 under pressure.

[0240] Specifically, the fixing element 901 is disposed on the second receiving element 408; the sliding element 903 is disposed between the second receiving element 408 and the fixing element 901.

[0241] It should be noted that the fixing element 901 is fixedly connected to or detachably connected to the second receiving element 408, including but not limited to threaded connections.

[0242] Generally, the fixing element 901 is roughly cylindrical in shape, usually a cylindrical structure.

[0243] Generally, the radial dimension (such as the outer diameter) of the fixing element 901 remains consistent from its outer end to its inner end.

[0244] In some of these embodiments, the radial dimension (e.g., outer diameter) of the fixing element 901 decreases from its outer end to its inner end.

[0245] Generally, the radial dimension (e.g., diameter) of the fixing element 901 is equal to the radial dimension (e.g., inner diameter) of the second receiving element 408.

[0246] It should be noted that the fixing element 901 has a hollow structure.

[0247] In some of these embodiments, the fixing element 901 includes, but is not limited to, a clamping mechanism.

[0248] The sixth channel element 902 is formed on the fixed element 901. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0249] The sixth channel element 902 is coaxially arranged with the fixed element 901, that is, the axis of the sixth channel element 902 is collinear with the axis of the fixed element 901.

[0250] Generally, the cross-section of the sixth channel element 902 is roughly circular. However, it can also be other shapes, such as rectangles, as long as they allow gas flow.

[0251] Generally, the radial dimension (e.g., diameter) of the sixth channel element 902 is smaller than the radial dimension (e.g., outer diameter) of the fixed element 901, and the axial dimension (e.g., height) of the sixth channel element 902 is equal to the axial dimension (e.g., height) of the fixed element 901.

[0252] In some embodiments, the sixth channel element 902 includes a fourth gas channel member and a fifth gas channel member. The fourth gas channel member is disposed through the inner end of the fixing element 901; the fifth gas channel member is disposed through the outer end of the fixing element 901 and communicates with the fourth gas channel member.

[0253] Generally, the radial dimension (e.g., diameter) of the fifth gas channel component is smaller than that of the fourth gas channel component.

[0254] In some of these embodiments, the sixth channel element 902 includes, but is not limited to, a vent hole, a vent groove, a vent cavity, etc.

[0255] Generally, the sliding element 903 is roughly cylindrical in shape, usually a cylindrical structure.

[0256] Generally, the radial dimension (such as the outer diameter) of the sliding element 903 remains consistent from its outer end to its inner end.

[0257] In some of these embodiments, the radial dimension (e.g., outer diameter) of the sliding element 903 increases from its outer end to its inner end.

[0258] Generally, the radial dimension (e.g., diameter) of the sliding element 903 is not greater than the radial dimension (e.g., inner diameter) of the second receiving element 408.

[0259] Generally, the minimum radial dimension (e.g., minimum outer diameter) of the sliding element 903 is equal to the radial dimension (e.g., inner diameter) of the fixed element 901.

[0260] It should be noted that the sliding element 903 has a hollow structure.

[0261] In some of these embodiments, the sliding element 903 includes, but is not limited to, a sliding cylinder.

[0262] The seventh channel element 904 is formed on the side of the inner end of the sliding element 903. Generally, it is obtained by machining methods (such as punching, piercing, etc.).

[0263] The axis of the seventh channel element 904 is perpendicular to the axis of the sliding element 903.

[0264] Generally, the cross-section of the seventh channel element 904 is roughly circular. However, it can also be other shapes, such as rectangles, as long as they allow gas flow.

[0265] In some embodiments, there are multiple seventh channel elements 904. Multiple seventh channel elements 904 are arranged around the sliding element 903.

[0266] In some of these embodiments, the seventh channel element 904 includes, but is not limited to, a vent hole, a vent groove, a vent cavity, etc.

[0267] Furthermore, the elastic unidirectional unit 900 also includes a sixth connecting element. The sixth connecting element is disposed on the outer edge surface of the fixing element 901 and is connected to the main body structure B.

[0268] The sixth connecting element is formed on the outer edge surface of the outer end of the fixed element 901. Generally, it is obtained by machining methods (such as turning, milling, grinding, threading, etc.).

[0269] Generally, the axial dimension (e.g., length) of the sixth connecting element is smaller than the axial dimension (e.g., length) of the fixed element 901.

[0270] In some embodiments, the sixth connecting element includes, but is not limited to, threads.

[0271] The method of using this utility model is as follows: (a) Working status Place the main component 401 in a gas source (such as a gas cylinder or gas pipeline). Adjust the relative position of the fixing element 901 and the second accommodating element 408 to adjust the valve opening pressure of the elastic one-way structure D; The pressure of the second cavity element 403, i.e. the external pressure of the telescopic element 302, is adjusted by the third channel element 406; Enclose the fourth channel component 407; The gas source enters the first channel element 404 through the flow limiting element 801; The pressure of the second cavity element 403, i.e. the internal pressure of the telescopic element 302, is adjusted by the second channel element 405; Since the external pressure is positive and the internal pressure is negative, a pressure difference is generated, which compresses the telescopic element 302. The piston element 301 drives the valve core element 201 to move downward, so that the gas in the first channel element 404 enters the interior of the telescopic element 302 through the valve seat element 101 and flows outward through the second channel element 405. As the pressure in the second channel element 405 gradually increases, the internal and external pressure difference gradually decreases. When the internal and external pressure difference disappears, the telescopic element 302 stretches, and the piston element 301 drives the valve core element 201 to move upward, thereby closing the valve seat element 101, so that the gas in the first channel element 404 cannot enter the interior of the telescopic element 302 through the valve seat element 101. (ii) Transportation Status During transportation, since there is no internal pressure in the second cavity element 403, there is no internal and external pressure difference in the telescopic element 302, and the valve core element 201 closes the valve seat element 101, preventing gas flow and ensuring safe transportation. (III) Purging Status During purging, the fourth channel element 407 is connected to the waste gas recovery mechanism; Connect the purging mechanism to the second channel element 405 to purge the pressure regulating device.

[0272] The technical effects of this utility model are as follows: pressure control, purging, and gas discharge can be remotely operated by pneumatic devices (such as pneumatic valves) without the need for close-range manual operation; during exhaust operation, the output pressure can be controlled by pneumatic devices (such as pneumatic valves), which is simple and convenient; the combination of the telescopic unit and the valve core unit achieves multiple seals, reducing the risk of leakage; during transportation, there will be no gas leakage, making it safer; using an adjustable elastic one-way structure, the opening pressure of the elastic one-way structure can be controlled. When the external cavity pressure of the telescopic unit increases excessively, the elastic one-way structure opens the valve to release pressure, preventing the valve core unit from becoming normally open.

[0273] Example 3 This embodiment relates to the automatic voltage regulation system of this utility model.

[0274] An automatic pressure regulating system based on differential pressure control includes a pressure regulating device, an automatic air intake device, and an automatic negative pressure device as described in Example 2. The automatic air intake device is connected to the main body structure B and is used to control whether to supply gas to the main body structure B; the automatic negative pressure device is connected to the main body structure B and is used to control whether to provide negative pressure to the main body structure B.

[0275] Specifically, the automatic air intake device is connected to the third channel element 406 and is used to control the pressure of the second cavity element 403, that is, the external pressure of the telescopic element 302; the automatic negative pressure device is connected to the second channel element 405 and is used to control the pressure of the second cavity element 403, that is, the internal pressure of the telescopic element 302.

[0276] It should be noted that automatic air intake devices (such as pneumatic valves) and automatic negative pressure devices (such as vacuum pumps) are conventional technical means in this field. For example, pneumatic valves will not be described in detail here.

[0277] The usage method and technical effects of this utility model are basically the same as those of Embodiments 1 and 2, and will not be repeated here.

[0278] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A valve structure based on differential pressure control, characterized in that, include: Valve seat unit; A valve core unit, wherein the valve core unit is movably connected to the valve seat unit; The telescopic unit has the valve seat unit inside and is connected to the valve core unit. It is used to drive the valve core unit to move relative to the valve seat unit under the action of pressure difference so that the valve structure switches between the open state and the closed state.

2. The valve structure according to claim 1, characterized in that, The valve seat unit includes: A valve seat element, wherein the telescopic unit is provided on the outside of the valve seat element; A first movable element is disposed through the bottom of the valve seat element and is movably connected to the valve core unit; A second movable element, which extends through the top of the valve seat element and communicates with the first movable element, and is movably connected to the telescopic unit; and / or The valve core unit includes: A valve core element, connected to the telescopic unit and movably connected to the valve seat unit, is used to move relative to the valve seat unit under the action of the telescopic unit to switch the valve structure between an open state and a closed state; and / or The telescopic unit includes: A piston element is connected to the valve core unit and movably connected to the valve seat unit, used to drive the valve core unit to move relative to the valve seat unit so that the valve structure switches between an open state and a closed state. A telescopic element, wherein the valve seat unit is disposed inside the telescopic element and is connected to the piston element, for driving the piston element to move relative to the valve seat unit under the action of pressure difference.

3. The valve structure according to claim 2, characterized in that, The valve seat unit also includes: A first limiting element, disposed on the outer edge surface of the top end of the valve seat element, is used to limit the position of the valve seat element when the valve seat unit is connected to other structures; and / or A first receiving element, disposed at the bottom end of the valve seat element, is used to accommodate other components; and / or The valve core unit also includes: A second limiting element, disposed at the bottom end of the valve core element, is used to limit the range of motion of the valve core element; and / or The telescopic unit also includes: The third limiting element is provided with the top end of the piston element and is connected to the telescopic element to prevent the piston element from separating from the telescopic element.

4. A pressure regulating device based on differential pressure control, characterized in that, include: Body structure; The valve structure as described in any one of claims 1 to 3, wherein the valve seat unit and the telescopic unit of the valve structure are respectively connected to the body structure, and are used to switch between an open state and a closed state under the action of pressure difference so that the body structure can switch between an open state and a closed state.

5. The voltage regulating device according to claim 4, characterized in that, The body structure includes: The body unit is connected to the valve seat unit and the telescopic unit respectively, and is used to switch between the open state and the closed state under the action of the valve core unit of the valve structure. A cover unit, wherein the cover unit is disposed at the top of the body unit; A first sealing unit is disposed between the body unit and the cover unit; The second sealing unit is disposed between the body unit and the valve seat unit.

6. The voltage regulating device according to claim 5, characterized in that, The body unit includes: The body component, wherein the valve structure is disposed inside the body component; A first cavity element is disposed inside the body element and connected to the valve seat unit; The second cavity element is disposed inside the body element and communicates with the first cavity element, and is connected to the bottom end of the telescopic unit; A first channel element is disposed through the body element and communicates with the first cavity element, for the purpose of allowing the valve core unit to move; The second channel element, which is disposed through the body element and communicates with the second cavity element, is used to allow gas to flow inside the telescopic unit; A third channel element, which extends through the body element and communicates with the second cavity element, is used to allow gas to flow outside the telescopic unit.

7. The voltage regulating device according to claim 6, characterized in that, The body unit also includes: A fourth channel element is disposed through the body element and communicates with the second cavity element for discharging gas.

8. The voltage regulating device according to any one of claims 4 to 7, characterized in that, Also includes: A flow-limiting structure is provided at the bottom of the main body structure to limit the gas flow rate entering the main body structure; and / or A flexible one-way structure is provided on the side of the main body structure to relieve pressure and prevent the valve structure from being in a normally open state.

9. The voltage regulating device according to claim 8, characterized in that, The body structure also includes: The second accommodating element is disposed on the side of the main body structure and connected to the elastic unidirectional structure; A fifth channel element, wherein the fifth channel element is disposed through the body structure and communicates with the second accommodating element, is used to allow gas to flow from the interior of the body structure through the fifth channel element to the second accommodating element; and / or The current limiting structure includes: A flow-limiting element is disposed at the bottom of the main body structure to limit the gas flow rate entering the main body structure; A fourth limiting element is disposed at the bottom of the main body structure and abuts against and communicates with the current limiting element, for limiting the position of the current limiting element; and / or The elastic unidirectional structure includes: A fixing element is disposed on the side of the main body structure and connected to the main body structure; A sixth channel element, which is disposed through the fixed element, is used to allow gas to flow outward through the sixth channel element; A sliding element is slidably disposed between the fixed element and the body structure, for closing or exposing the pressure relief channel of the body structure; At least one seventh channel element is provided, which is disposed through the sliding element, for allowing gas to flow outward sequentially through the seventh channel element and the sixth channel element; An elastic element is disposed between the fixed element and the sliding element, and is used to drive the sliding element to move relative to the fixed element under pressure.

10. An automatic pressure regulating system based on differential pressure control, characterized in that, include: The voltage regulating device as described in any one of claims 4 to 9; An automatic air intake device, which is connected to the main body structure, is used to control whether to supply gas to the main body structure; An automatic negative pressure device is connected to the main body structure and is used to control whether to provide negative pressure to the main body structure.

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