Gas pressure reducing valve used underwater

Abstract

The underwater gas pressure reducing valve comprises a valve body, a gas inlet assembly and a gas outlet assembly are installed on the valve body, an installation cavity and a high-pressure chamber are arranged in the valve body, a piston is movably installed in the installation cavity, and the installation cavity is divided into a medium-pressure chamber and a pressure regulating chamber by the piston; a pressure regulating spring is arranged in the pressure regulating chamber, a connecting hole is formed between the pressure regulating chamber and the high-pressure chamber, a hollow valve pipe is inserted in the connecting hole in a sliding mode, the valve pipe is arranged on the piston in a penetrating mode, and the medium-pressure chamber and the high-pressure chamber are communicated through the valve pipe. A first sealing block is arranged at the end, away from the connecting hole, of the high-pressure chamber, a plurality of through holes are formed in the valve body, and the pressure regulating chamber is communicated with the outside of the valve body through the through holes. The pressure reducing valve can adjust the air supply pressure according to the change of environment water pressure, and the use experience and safety of a user are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure reducers, in particular to a gas pressure reducing valve used underwater. Background Art

[0002] Divers need to carry oxygen cylinders when diving. For easy storage, oxygen is usually pressurized and stored in the cylinders. Since the gas pressure in the cylinders is high, it cannot be directly supplied to the diver for breathing. Therefore, it is usually necessary to use a gas pressure reducing valve to reduce the high-pressure gas in the oxygen cylinder to meet the breathing pressure required by the diver.

[0003] To ensure safety, the gas pressure a diver breathes needs to be consistent with the ambient water pressure, which increases with increasing water depth. In some ocean diving operations, divers need to repeatedly swim back and forth between deep water and the diving area, resulting in significant fluctuations in water pressure. Current pressure reducing valves can only supply air to divers according to a set supply pressure. When divers work in a changing underwater environment, the pressure reducing valve's supply pressure cannot be adjusted or compensated for changes in ambient water pressure, which can easily cause discomfort when breathing and affect the diver's experience. In severe cases, it can even cause chest tightness, dizziness, and vertigo, posing a significant safety risk. Therefore, a pressure reducing valve that can adjust pressure according to ambient water pressure is urgently needed to ensure the diver's experience and safety. Summary of the Invention

[0004] In view of this, the present invention provides a gas pressure reducing valve that can adjust the gas supply pressure according to the ambient water pressure, thereby effectively adapting to the use in the changing underwater environment and improving the user experience and safety.

[0005] 14. The repairing kit for automotive dents, according to claim 13, wherein the foot print has a check valve in its foot print and a check valve in its foot print. The foot print has a check valve in its foot print and a check valve in its foot print. The foot print has a check valve in its foot print and a check valve in its foot print.

[0006] In the above technical solution, the air inlet assembly is connected to a gas cylinder containing gas and is used to introduce the high-pressure gas in the gas cylinder into the high-pressure chamber. The air outlet assembly is connected to the underwater breathing apparatus and is used to transmit the medium-pressure gas in the medium-pressure chamber after decompression to the underwater breathing apparatus for the user to breathe. When the user inhales, the pressure in the medium-pressure chamber decreases. At this time, the piston rises under the action of the pressure-regulating spring, causing the end of the valve tube to move away from the first sealing block, creating a gap. The high-pressure gas in the high-pressure chamber enters the medium-pressure chamber through the valve tube and is converted into medium-pressure gas, replenishing the medium-pressure chamber. The gas is then supplied to the user for breathing through the air outlet assembly. When the user stops inhaling, the pressure in the medium-pressure chamber increases, forcing the piston to move downward against the elastic force of the spring until the air pressure increases to a level that causes the valve tube to rest against the first sealing block again, closing the gap and preventing high-pressure gas from entering the valve tube. Through this cycle, the air supply pressure in the medium-pressure chamber is maintained stable, providing a stable breathing air source for the user. The air supply pressure in the medium-pressure chamber can also be controlled by adjusting the force of the pressure-regulating spring on the piston.

[0007] Among them, the valve body is provided with multiple conducting holes, which connect the pressure regulating chamber with the outside of the valve body. When used underwater, water can enter the pressure regulating chamber through the conducting holes, connecting the pressure regulating chamber with the underwater environment.

[0008] The invention relates to a pressure reducing valve which is designed to reduce the pressure of the gas supply in the medium pressure chamber and the pressure relief valve which is used to reduce the pressure of the gas supply in the medium pressure chamber. ...

[0009] In one embodiment, the valve body includes a valve seat and a valve cover, the valve cover is threadedly mounted on the end of the valve body, the valve seat is provided with a first mounting groove, and the valve cover is provided with a second mounting groove, and the first mounting groove and the second mounting groove together form the mounting chamber.

[0010] In the above technical solution, the valve cover and the valve seat are threadedly connected, which is convenient for assembly and disassembly. After the valve cover and the valve seat are installed, the first installation groove and the second installation groove cooperate with each other to form an installation chamber for accommodating the piston and the pressure-regulating spring.

[0011] In one embodiment, a protruding fixing block is provided in the first installation groove, the connecting hole is located on the fixing block, the piston is provided with a protruding fixing portion, and the pressure-adjusting spring is sleeved on the fixing block and the outside of the fixing portion.

[0012] In the above technical solution, an annular groove for accommodating the pressure-regulating spring is formed between the fixed block and the side wall of the first mounting groove, which cooperates with the fixing part at the end of the piston to limit and fix the pressure-regulating spring to prevent the pressure-regulating spring from shifting during operation.

[0013] In one embodiment, a sealing gasket is provided between the piston and the fixed block, and the sealing gasket is provided with a hole for the valve tube to pass through.

[0014] In the above technical solution, the sealing gasket is an elastic structure, which can enhance the sealing between the connecting hole and the pressure regulating chamber without affecting the movement of the piston.

[0015] In one embodiment, a sealing installation groove is provided on the valve body, and the sealing installation groove is connected to the end of the high-pressure chamber away from the connecting hole. A sealing screw head is threadedly installed in the sealing installation groove, and a limit block is provided on the sealing screw head. The first sealing block is provided with a limit groove that cooperates with the limit block.

[0016] In the above technical solution, the setting of the sealing installation groove facilitates the installation of other components into the high-pressure chamber. After the installation is completed, the high-pressure chamber is sealed by the sealing screw head. The sealing screw head and the sealing installation groove are threadedly connected, which is convenient for installation and disassembly, and also convenient for subsequent maintenance. A limit block is provided at one end of the sealing screw head located in the high-pressure chamber for limiting and fixing the first sealing block.

[0017] In one embodiment, a second sealing block is provided at one end of the high-pressure chamber close to the connecting hole, the second sealing block is sleeved on the valve tube, a sealing spring is provided between the first sealing block and the second sealing block, and sealing grooves for installing sealing rings are provided on the outer sides of the first sealing block and the second sealing block.

[0018] In the above technical solution, the second sealing block is used to strengthen the seal between the connecting hole and the high-pressure chamber. The first sealing block and the second sealing block are located at both ends of the high-pressure chamber and respectively resist the two ends of the sealing spring. The first sealing block and the second sealing block are pressed tightly by the elastic force applied by the sealing spring. In addition, sealing rings are installed in the sealing grooves of the first sealing block and the second sealing block to enhance the sealing effect of the high-pressure chamber.

[0019] In one embodiment, the valve seat is provided with an air inlet connected to the high-pressure chamber, the air inlet assembly is mounted on the air inlet, the valve cover is provided with an air outlet connected to the medium-pressure chamber, and the air outlet assembly is mounted on the air outlet.

[0020] In the above technical solution, the high-pressure gas in the gas cylinder enters the high-pressure chamber through the air inlet assembly and the air inlet, reaches the medium-pressure chamber after internal decompression, and is then discharged through the air outlet and the air outlet assembly.

[0021] In one embodiment, the air intake assembly includes an air intake seat and a filter element. The air intake seat is threadedly connected to the air inlet. An air intake channel is provided in the air intake seat, and the filter element is installed in the air intake channel.

[0022] In the above technical solution, the air intake channel runs through both ends of the air intake seat, and the high-pressure gas in the gas cylinder enters the high-pressure chamber through the air intake channel. A filter element is provided in the air intake channel to filter the gas. The air intake seat and the air inlet port are threadedly connected, which is convenient for disassembly and assembly, and is conducive to the subsequent cleaning and replacement of the filter element.

[0023] In one embodiment, a locking knob is threadedly sleeved on the outer side of the air inlet seat, and a sealing rubber cover is provided between the locking knob and the valve body. The sealing rubber cover includes a connecting rubber strip and a sealing cover. The connecting rubber strip is sleeved on the outer side of the air inlet seat, and a block that cooperates with the sealing cover is provided at the end of the air inlet seat away from the valve body.

[0024] In the above technical solution, the opening of the air intake channel is located on the card block. When not in use, the sealing cover can be placed on the card block by bending the connecting rubber strip, thereby closing the air intake channel to prevent impurities from entering. The locking knob is threadedly connected to the air intake seat. The sealing rubber cover can be tightened by the locking knob, and the air intake seat can also be pressed against the valve body to ensure a stable connection.

[0025] In one embodiment, the air outlet assembly includes an air outlet seat and a connecting screw head, one end of the connecting screw head is provided with a clamping portion, the clamping portion is clamped with the step surface on the air outlet, the connecting screw head is provided with an air outlet hole, the air outlet seat is threadedly connected to the connecting screw head, and a plurality of air outlet interfaces are provided on the air outlet seat.

[0026] In the above technical solution, the air outlet is a stepped structure with a step surface, and the clamping part of the connecting screw head is clamped on the air outlet through the step surface, and the threaded part is threadedly connected to the air outlet seat. A cavity is provided inside the air outlet seat, and the cavity is connected to the medium-pressure chamber through the air outlet hole on the connecting screw head. The air outlet interface is used to connect to an external gas-using device. After the gas in the medium-pressure chamber enters the interior of the air outlet seat, it supplies air to the external gas-using device through the air outlet interface.

[0027] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a plurality of conducting holes on the valve body that are connected to the pressure regulating chamber, so that water can enter the pressure regulating chamber, thereby exposing the pressure regulating chamber and the pressure regulating spring therein to the water environment. By sensing the change in water pressure, the air supply pressure in the medium pressure chamber can be adjusted, which brings a better user experience and greatly improves safety. It is better suitable for diving work in deep water and changeable environment, and has stronger practicality. The valve tube of the present invention is passed through the piston, which can significantly reduce the mass of the piston and speed up the movement of the piston compared to the piston and the valve tube being set separately, thereby making the pressure reducing valve more sensitive to trigger and more reliable in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 Schematic diagram of the internal structure of a gas pressure reducing valve according to an embodiment.

[0030] Figure 2 Schematic diagram of the internal structure of the valve body.

[0031] Figure 3 This is a partial cross-sectional view of a gas pressure reducing valve.

[0032] Description of reference numerals in the figures: Valve body; 11-valve seat; 111-first mounting groove; 112-fixing block; 113-sealing mounting groove; 114-air inlet; 115-high-pressure interface; 12-valve cover; 121-second mounting groove; 122-air outlet; 123-conducting hole; 13-mounting chamber; 131-medium-pressure chamber; 132-pressure regulating chamber; 14-high-pressure chamber; 141-first sealing block; 1411-groove; 1412-limiting groove; 142-second sealing block; 143-sealing groove; 144-sealing spring; 15-connecting hole; 2-piston; 21- Fixed part; 3-pressure-adjusting spring; 4-valve tube; 41-connecting part; 5-sealing gasket; 6-sealing screw head; 61-limiting block; 62-end cover; 7-air inlet assembly; 71-air inlet seat; 711-air inlet channel; 712-filter element; 713-block; 72-sealing rubber cover; 721-connecting rubber strip; 722-sealing cover; 7221-sealing groove; 73-locking knob; 8-air outlet assembly; 81-air outlet seat; 811-air outlet interface; 82-connecting screw head; 821-clamping part; 822-air outlet hole; 9-plug; M-sealing ring. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. Example

[0036] Please refer to Figures 1 to 3A gas pressure reducing valve is used to reduce the pressure of high-pressure gas in a gas cylinder for use in underwater breathing apparatus. The valve body 1 includes a valve body 1 on which an air inlet assembly 7 and an air outlet assembly 8 are mounted. The valve body 1 includes an installation chamber 13 and a high-pressure chamber 14. A piston 2 is movably mounted in the installation chamber 13. The piston 2 separates the installation chamber 13 into a medium-pressure chamber 131 and a pressure regulating chamber 132. A pressure regulating spring 3 is provided in the pressure regulating chamber 132. A connecting hole 15 is provided between the pressure regulating chamber 132 and the high-pressure chamber 14. The connecting hole 15 is provided between the pressure regulating chamber 132 and the high-pressure chamber 14. 5 is slidably inserted with a hollow valve tube 4 inside, and the valve tube 4 is inserted into the piston 2. The medium-pressure chamber 131 and the high-pressure chamber 14 are connected through the valve tube 4. The end of the high-pressure chamber 14 away from the connecting hole 15 is provided with a first sealing block 141. The valve body 1 is provided with a plurality of conducting holes 123. The pressure regulating chamber 132 is connected to the outside of the valve body 1 through the conducting holes 123. The air inlet assembly 7 is installed on one side of the high-pressure chamber 14 and is connected to the high-pressure chamber 14. The air outlet assembly 8 is installed on one side of the medium-pressure chamber 131 and is connected to the medium-pressure chamber 131.

[0037] Specifically, the air inlet assembly 7 is connected to the gas cylinder storing gas, and is used to introduce the high-pressure gas in the gas cylinder into the high-pressure chamber 14. The air outlet assembly 8 is connected to the underwater breathing apparatus, and is used to transmit the medium-pressure gas that has completed the decompression in the medium-pressure chamber 131 to the underwater breathing apparatus for the user to breathe. When the user inhales, the pressure in the medium-pressure chamber 131 decreases. At this time, the piston 2 rises under the action of the pressure-regulating spring 3, so that the end of the valve tube 4 leaves the first sealing block 141, creating a gap. The high-pressure gas in the high-pressure chamber 14 enters the medium-pressure chamber 131 through the valve tube 4, and is converted into medium-pressure gas, which in turn affects the medium-pressure chamber. 131 is replenished, and the gas is supplied to the user for breathing through the air outlet assembly 8. When the user stops inhaling, the pressure in the medium-pressure chamber 131 increases, pressing the piston 2 to overcome the elastic force of the spring and move downward, until the air pressure in the medium-pressure chamber 131 can make the valve tube 4 rest against the first sealing block 141 again, closing the gap, and the high-pressure gas no longer enters the valve tube 4. Through the above cycle, the air supply pressure in the medium-pressure chamber 131 can be kept stable, providing the user with a stable breathing air source, and the air supply pressure in the medium-pressure chamber 131 can be controlled by adjusting the force of the pressure-regulating spring 3 on the piston 2.

[0038] The outside of the valve tube 4 is provided with a connecting portion 41 for connecting to the piston 2, and the piston 2 is provided with a connecting groove for accommodating the connecting portion 41, so that the valve tube 4 is inserted into the piston 2. The setting of the connecting groove can also reduce the mass of the piston 2 and speed up the movement speed of the piston 2, making the triggering of the pressure reducing valve more sensitive and the use reliability higher; in addition, a sealing ring M is installed between the bottom of the connecting portion 41 of the valve tube 4 and the connecting groove of the piston 2 to enhance the sealing effect.

[0039] Among them, the valve body 1 is provided with multiple conducting holes 123, which connect the pressure regulating chamber 132 with the outside of the valve body 1. Water can enter the pressure regulating chamber 132 through the conducting holes 123, connecting the pressure regulating chamber 132 with the underwater environment.

[0040] It should be noted that, to ensure safety, the gas pressure required for the user's breathing must be consistent with the ambient water pressure. Since water pressure increases with increasing water depth, the gas pressure required for the user's breathing also increases with increasing diving depth. That is, the gas supply pressure in the medium-pressure chamber 131 needs to increase accordingly. The pressure-reducing valve connects the pressure-regulating chamber 132 to the outside through the guide hole 123, placing the pressure-regulating chamber 132 in a water environment. The water pressure can form a combined force with the elastic force of the pressure-regulating spring 3, which jointly exerts force on the piston 2, increasing the force on the piston 2. At this time, due to the increase in the force on the piston 2 on the pressure-regulating chamber 132 side, the gas in the high-pressure chamber 14 will continue to flow into the medium-pressure chamber 131 until the force of the pressure-regulating spring 3 can close the gap between the valve tube 4 and the first sealing block 141. At this time, the gas supply pressure in the medium-pressure chamber 131 also increases. Therefore, by placing the pressure-regulating chamber 132 in a water environment, the water pressure can compensate for the gas supply pressure in the medium-pressure chamber 131 as the water depth increases. In summary, the pressure reducing valve is exposed through the pressure regulating chamber 132, and can adjust the air supply pressure in the medium pressure chamber 131 by sensing the changes in water pressure, thereby providing users with a better user experience. At the same time, it also greatly improves safety, is better suited for diving work in deep water and changeable environments, and is more practical.

[0041] Preferably, a plurality of grooves for accommodating sealing rings M are provided on the outer side of the piston 2. By installing the sealing rings M (i.e., the bold circle portion in the figure), the sealing effect is enhanced to ensure that the piston 2 effectively separates the installation chamber 13.

[0042] Please refer to Figures 1 to 3 The valve body 1 includes a valve seat 11 and a valve cover 12. The valve cover 12 is threadedly installed on the end of the valve body 1. The high-pressure chamber 14 is located inside the valve seat 11. The valve seat 11 is provided with a first mounting groove 111, and the valve cover 12 is provided with a second mounting groove 121. The first mounting groove 111 and the second mounting groove 121 together form an installation chamber 13. The valve cover 12 is threadedly connected to the valve seat 11 to facilitate assembly and disassembly. After the valve cover 12 and the valve seat 11 are installed, the first mounting groove 111 and the second mounting groove 121 cooperate with each other to form an installation chamber 13 for accommodating the piston 2 and the pressure-regulating spring 3.

[0043] Specifically, as shown in the figure, the inner wall of the valve cover 12 below the second installation groove 121 is provided with a thread, and the outer side of the valve seat 11 is provided with a matching thread, so that the valve seat 11 and the valve cover 12 are threadedly connected, which is convenient for disassembly and assembly.

[0044] Preferably, the conducting holes 123 are provided on the valve cover 12 and are arranged on the valve cover 12 at circumferential intervals.

[0045] Please refer to Figures 1 to 2 A protruding fixing block 112 is provided in the first mounting groove 111, and the connecting hole 15 is located on the fixing block 112. The piston 2 is provided with a protruding fixing portion 21, and the pressure-regulating spring 3 is sleeved on the outside of the fixing block 112 and the fixing portion 21. An annular groove for accommodating the pressure-regulating spring 3 is formed between the fixing block 112 and the side wall of the first mounting groove 111, and the fixing portion 21 at the end of the piston 2 is used to limit and fix the pressure-regulating spring 3 to prevent the pressure-regulating spring 3 from shifting during operation. In addition, a sealing gasket 5 is provided between the piston 2 and the fixing block 112. The sealing gasket 5 is provided with a hole for the valve tube 4 to pass through. The sealing gasket 5 is an elastic structure. Without affecting the movement of the piston 2, it can enhance the sealing between the connecting hole 15 and the pressure-regulating chamber 132.

[0046] Please refer to Figures 1 to 2 , a sealing mounting groove 113 is provided on the valve seat 11, and the sealing mounting groove 113 is connected to the end of the high-pressure chamber 14 away from the connecting hole 15. A sealing screw head 6 is installed in the inner thread of the sealing mounting groove 113. The setting of the sealing mounting groove 113 is convenient for installing other components into the high-pressure chamber 14. After the installation is completed, the high-pressure chamber 14 can be sealed by the sealing screw head 6, wherein the sealing screw head 6 and the sealing mounting groove 113 are threadedly connected, which is convenient for installation and disassembly, and also convenient for subsequent maintenance and maintenance. A limit block 61 is provided at one end of the sealing screw head 6 located in the high-pressure chamber 14, and the first sealing block 141 is provided with a limit groove 1412 that cooperates with the limit block 61, and the first sealing block 141 is limited and fixed by the limit block 61 and the limit groove 1412.

[0047] Preferably, the end of the sealing screw head 6 is connected to an end cover 62, and the sealing screw head 6 can be screwed into the installation groove through the end cover 62, which is convenient for installation and removal.

[0048] Preferably, a sealing ring M is installed at the bottom of the installation groove, and the sealing ring M is compressed by the sealing screw head 6 to enhance the sealing performance.

[0049] Please refer to Figures 1 to 2The first and second sealing blocks 141 and 142 are respectively pressed against the two ends of the sealing spring 144 to press the first and second sealing blocks 141 and 142 against the two ends of the high-pressure chamber 14. The elastic force of the sealing spring 144 is used to press the first and second sealing blocks 141 and 142 against the two ends of the high-pressure chamber 14 to ensure a firm installation. In addition, the outer sides of the first and second sealing blocks 141 and 142 are provided with sealing grooves 143 for installing a sealing ring M, and sealing rings M are installed in the sealing grooves 143 of the first and second sealing blocks 141 and 142 to strengthen the sealing effect of the high-pressure chamber 14.

[0050] Preferably, a groove 1411 is provided on the side of the first sealing block 141 close to the valve tube 4. The diameter of the groove 1411 is larger than the diameter of the valve tube 4, and the groove wall is an inclined slope. The valve tube 4 can rest against the groove wall of the groove 1411. By setting the groove 1411, the sealing effect between the valve tube 4 and the first sealing block 141 can be enhanced.

[0051] Please refer to Figures 1 to 2 The valve seat 11 is provided with an air inlet 114 connected to the high-pressure chamber 14 for installation of the air inlet assembly 7. The valve cover 12 is provided with an air outlet 122 connected to the medium-pressure chamber 131 for installation of the air outlet assembly 8. The high-pressure gas in the gas cylinder enters the high-pressure chamber 14 through the air inlet assembly 7 and the air inlet 114, reaches the medium-pressure chamber 131 after internal decompression, and is then discharged through the air outlet 122 and the air outlet assembly 8.

[0052] Specifically, the air intake assembly 7 includes an air intake seat 71 and a filter element 712. The air intake seat 71 is threadedly connected to the air inlet 114. An air intake channel 711 is provided in the air intake seat 71. The filter element 712 is installed in the air intake channel 711. The air intake channel 711 runs through both ends of the air intake seat 71. When in use, the end of the air intake seat 71 located outside the air inlet 114 is connected to the gas cylinder. The high-pressure gas in the gas cylinder enters the high-pressure chamber 14 through the internal air intake channel 711. A filter element 712 is provided in the air intake channel 711 to filter the gas. The air intake seat 71 is threadedly connected to the air inlet 114, which is convenient for disassembly and assembly, and is conducive to the subsequent cleaning or replacement of the internal filter element 712.

[0053] Preferably, a sealing ring M is embedded on one end of the gas inlet seat 71 provided with a clamping block 713, which can enhance the sealing performance when docking with the gas cylinder interface.

[0054] Preferably, the air inlet 114 is composed of two holes with different inner diameters. The inner diameter of the hole on the outside of the valve seat 11 is larger, and its inner wall is provided with threads. The threaded end of the air inlet seat 71 is inserted into the hole on the outside to complete the threaded installation connection. The hole with a smaller inner diameter is used to connect the air inlet channel 711 and the high-pressure chamber 14; wherein, a sealing ring M is installed between the air inlet seat 71 and the step surface in the air outlet hole 822 to enhance the sealing performance.

[0055] When hinged, the top of locking plate 75 is hinged on the top of locking plate 74, and lock core 71 is hinged on the top of locking plate 74, and lock core 71 is hinged on the top of locking plate 74, so that lock core 71 is in the state of being completely locked.

[0056] Specifically, the air outlet assembly 8 includes an air outlet seat 81 and a connecting screw head 82, one end of the connecting screw head 82 is provided with a clamping portion 821, and the air outlet 122 is a stepped structure with a step surface, and the clamping portion 821 of the connecting screw head 82 is clamped on the air outlet 122 through the step surface of the air outlet 122, and its threaded end extends out of the air outlet 122 and is threadedly connected to the air outlet seat 81, and the connecting screw head 82 is provided with an air outlet hole 822, and a cavity is provided inside the air outlet seat 81, and the cavity inside the air outlet seat 81 and the medium-pressure chamber 131 are connected through the air outlet hole 822, and a plurality of air outlet interfaces 811 are provided on the air outlet seat 81, and the air outlet interface 811 is used to connect with an underwater breathing device through a hose or other means. The gas in the medium-pressure chamber 131 enters the internal cavity of the air outlet seat 81 through the air outlet hole 822, and then supplies air to the external air-using device through the air outlet interface 811.

[0057] Among them, a plug 9 is installed on the air outlet interface 811 to seal the air outlet interface 811 to ensure sealing. The plug 9 is removed when the air outlet interface 811 needs to be used.

[0058] It is worth mentioning that, in addition to being connected to an external gas-using device, the gas outlet interface 811 can also be used to install a pressure gauge and a safety valve (not shown in the figure). The pressure gauge can be used to check the internal gas supply pressure, and the safety valve can relieve pressure when the internal pressure is abnormal, thereby ensuring the safety of the user.

[0059] Please refer to Figure 3The valve seat 11 is also provided with a plurality of high-pressure interfaces 115 connected to the high-pressure chamber 14. The high-pressure interface 115 can be used to install a pressure gauge to facilitate checking the pressure in the high-pressure chamber 14. It can also be used to install a safety valve to release pressure when the internal pressure is abnormal.

[0060] Correspondingly, a plug 9 is also installed on the high-pressure interface 115 to seal it when not in use to ensure sealing.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0062] In the description of the present invention, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0064] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

Claims

1. A gas pressure reducing valve for underwater use, comprising a valve body, an air inlet assembly and an air outlet assembly mounted on the valve body, characterized in that: An installation chamber and a high-pressure chamber are provided in the valve body, a piston is movably installed in the installation chamber, the piston divides the installation chamber into a medium-pressure chamber and a pressure-regulating chamber, a pressure-regulating spring is provided in the pressure-regulating chamber, a connecting hole is provided between the pressure-regulating chamber and the high-pressure chamber, a valve tube with an internal hollow is slidably inserted in the connecting hole, the valve tube is passed through the piston, the medium-pressure chamber and the high-pressure chamber are connected through the valve tube, a first sealing block is provided at the end of the high-pressure chamber away from the connecting hole, a plurality of conducting holes are provided on the valve body, and the pressure-regulating chamber is connected to the outside of the valve body through the conducting holes.

2. The gas pressure reducing valve according to claim 1, characterized in that: The valve body includes a valve seat and a valve cover. The valve cover is threadedly mounted on the end of the valve body. The valve seat is provided with a first mounting groove, and the valve cover is provided with a second mounting groove. The first mounting groove and the second mounting groove together form the mounting chamber.

3. The gas pressure reducing valve according to claim 2, characterized in that: A protruding fixing block is provided in the first installation groove, the connecting hole is located on the fixing block, the piston is provided with a protruding fixing portion, and the pressure regulating spring is sleeved on the fixing block and the outside of the fixing portion.

4. The gas pressure reducing valve according to claim 3, characterized in that: A sealing gasket is provided between the piston and the fixing block, and the sealing gasket is provided with a hole for the valve tube to pass through.

5. The gas pressure reducing valve according to claim 1, characterized in that: A sealing installation groove is provided on the valve body, and the sealing installation groove is connected to the end of the high-pressure chamber away from the connecting hole. A sealing screw head is threadedly installed in the sealing installation groove, and a limit block is provided on the sealing screw head. The first sealing block is provided with a limit groove that cooperates with the limit block.

6. The gas pressure reducing valve according to claim 1, characterized in that: A second sealing block is provided at one end of the high-pressure chamber close to the connecting hole, and the second sealing block is sleeved on the valve tube. A sealing spring is provided between the first sealing block and the second sealing block, and sealing grooves for installing sealing rings are provided on the outer sides of the first sealing block and the second sealing block.

7. The gas pressure reducing valve according to claim 2, characterized in that: The valve seat is provided with an air inlet connected to the high-pressure chamber, the air inlet assembly is mounted on the air inlet, the valve cover is provided with an air outlet connected to the medium-pressure chamber, the air outlet assembly is mounted on the air outlet.

8. The gas pressure reducing valve according to claim 7, characterized in that: The air intake assembly includes an air intake seat and a filter element. The air intake seat is threadedly connected to the air inlet. An air intake channel is provided in the air intake seat, and the filter element is installed in the air intake channel.

9. The gas pressure reducing valve according to claim 8, characterized in that: A locking knob is threadedly sleeved on the outer side of the air intake seat, and a sealing rubber cover is provided between the locking knob and the valve body. The sealing rubber cover includes a connecting rubber strip and a sealing cover. The connecting rubber strip is sleeved on the outer side of the air intake seat, and a clamping block that cooperates with the sealing cover is provided at the end of the air intake seat away from the valve body.

10. The gas pressure reducing valve according to claim 7, characterized in that: The air outlet assembly includes an air outlet seat and a connecting screw head. One end of the connecting screw head is provided with a clamping portion, and the clamping portion is clamped with the step surface on the air outlet. The connecting screw head is provided with an air outlet hole. The air outlet seat is threadedly connected to the connecting screw head, and a plurality of air outlet interfaces are provided on the air outlet seat.

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