Diaphragm type gas pressure reducing valve

Abstract

The invention relates to a diaphragm type gas pressure reducing valve which comprises a valve body, an air inlet is formed in the valve body, an air inlet assembly is installed on the air inlet, the interior of the valve body is divided into a high-pressure chamber and a low-pressure chamber through an inner wall, and the high-pressure chamber and the low-pressure chamber communicate with the outside from the two ends of the valve body correspondingly. A valve port is formed between the high-pressure chamber and the low-pressure chamber, the end, located in the low-pressure chamber, of the valve body is connected with a pressure adjusting assembly, a diaphragm piece is arranged between the pressure adjusting assembly and the low-pressure chamber, a valve rod is installed on the valve port in a sliding mode and comprises a disc, a vertical rod and a plurality of guide rods, the vertical rod is inserted into the valve port in a sliding mode, and the guide rods are arranged on the disc. A plurality of inserting holes are formed in the peripheral side of the valve port in a surrounding mode, a switch assembly is installed in the high-pressure chamber and comprises a piston column and a second spring, and the piston column abuts against the valve port under the elastic force effect of the second spring. The device has the advantages of being convenient to assemble and use, high in reliability, long in service life and the like.

Description

Technical Field

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

[0002] For easy storage, gas is usually pressurized and stored in gas cylinders. Since the pressure inside the gas cylinder is high, while the pressure required for external gas-using devices is relatively low, a gas pressure reducing valve is usually required to convert the high-pressure gas stored in the gas cylinder into low-pressure gas and ensure that the output gas pressure remains stable from beginning to end for safe use by external gas-using devices.

[0003] Current gas pressure reducing valves mainly include diaphragm and piston types. Diaphragm-type pressure reducing valves primarily sense pressure changes through an internal diaphragm, using the diaphragm's deformation to move a switch installed in the valve port, controlling the opening and closing of the valve port, thereby achieving both pressure reduction and pressure stabilization. Due to the high sealing requirements of pressure reducing valves, the connections between the various components must be very tight. Existing diaphragm-type pressure reducing valves are typically assembled sequentially into the valve housing. Subsequent disassembly or maintenance of the valve's internal components requires the entire valve to be completely dismantled, making the work difficult and inconvenient. Furthermore, the movement of the valve port switch component by the diaphragm's deformation can easily cause the valve port switch component to twist or deflect during movement, causing it to come into contact with other internal components of the valve, potentially scratching the valve port switch component. Furthermore, the relative rotation between the valve stem and the diaphragm can also cause torsional damage to the diaphragm. These scratches and twists caused by internal movement can cause the valve to malfunction, seriously impacting its service life. Summary of the Invention

[0004] The object of the present invention is to provide a diaphragm type gas pressure reducing valve which is easy to assemble and use and can effectively extend the service life.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] A diaphragm type gas pressure reducing valve comprises a valve body, an air inlet is provided on the valve body, an air inlet assembly is installed on the air inlet, the interior of the valve body is divided into a high-pressure chamber and a low-pressure chamber by an inner wall, the high-pressure chamber and the low-pressure chamber are respectively connected to the outside from both ends of the valve body, a valve port is provided between the high-pressure chamber and the low-pressure chamber, the air inlet is connected to the high-pressure chamber, a pressure regulating assembly is connected to one end of the valve body located in the low-pressure chamber, a diaphragm is provided between the pressure regulating assembly and the low-pressure chamber, and the pressure regulating assembly is connected to the diaphragm The valve port is slidably mounted with a valve stem, which comprises a disc, a vertical rod perpendicular to one side surface of the disc, and a plurality of guide rods surrounding the vertical rod. The disc contacts the diaphragm, and the vertical rod is slidably inserted into the valve port. A plurality of sockets matching the guide rods are provided around the circumference of the valve port. A switch assembly is installed in the high-pressure chamber, and the switch assembly comprises a piston column and a second spring. The piston column rests on the valve port under the elastic force of the second spring.

[0007] In the above scheme, the high-pressure chamber and the low-pressure chamber are respectively connected to the outside from both ends of the valve body, which is convenient for installing the switch assembly and the pressure regulating assembly, and also convenient for disassembling the switch assembly and the pressure regulating assembly. The pressure regulating assembly and the low-pressure chamber are located on both sides of the diaphragm. The pressure regulating assembly is used to apply pressure to the diaphragm. When the pressure of the gas in the low-pressure chamber on the diaphragm is less than the pressure applied by the pressure regulating assembly, the diaphragm will deform and push the valve stem to move. At this time, the vertical rod of the valve stem pushes the piston rod open to open the valve port. When the pressure of the gas in the low-pressure chamber on the diaphragm is balanced with the pressure applied to the diaphragm by the pressure regulating assembly, the diaphragm returns to its original shape, and the piston rod rests against the valve port again under the elastic force of the second spring to close the valve port. Therefore, the air pressure in the low-pressure chamber can be controlled by adjusting the pressure applied to the diaphragm by the pressure regulating assembly, and the air pressure in the low-pressure chamber can be kept stable to provide a stable gas source to meet the needs of external gas-using devices. During specific use, under the action of the initial pressure of the pressure regulating assembly, the valve port is in an open state, the low-pressure chamber is connected to the gas-consuming device, and the air inlet assembly is connected to the gas cylinder. The high-pressure gas in the gas cylinder enters the high-pressure chamber through the air inlet assembly and the air inlet, and then enters the low-pressure chamber through the valve port, and is converted into low-pressure gas. Until the air pressure in the low-pressure chamber reaches the set value, the valve port is closed under the action of the piston rod. As the low-pressure chamber is supplied with air to the outside, when the air pressure in the low-pressure chamber is lower than the required value, the valve port will open again under the action of the diaphragm and the valve stem to keep the air pressure in the low-pressure chamber stable. Among them, a plurality of guide rods are provided around the vertical rod side of the valve stem. The guide rods are slidably inserted into the sockets around the valve port, which can play a limiting and guiding role when the valve stem moves, preventing the valve stem from contacting the valve port and causing scratches. At the same time, it can also prevent relative rotation between the diaphragm and the valve stem to prevent the diaphragm from twisting. Through the cooperation of the guide rod and the socket, twisting and scratching during the internal movement of the pressure reducing valve can be effectively avoided, thereby protecting the internal structure of the pressure reducing valve and improving its service life.

[0008] In one embodiment, the pressure regulating assembly includes a mounting seat, a pressure regulating nut and a first spring. The mounting seat is provided with a threaded hole, the pressure regulating nut is threadedly installed in the threaded hole, and the first spring is located between the pressure regulating nut and the diaphragm.

[0009] In the above solution, the compression amount of the first spring is controlled by adjusting the pressure-adjusting nut, thereby adjusting the pressure applied to the diaphragm to achieve the effect of regulating the air pressure in the low-pressure chamber.

[0010] In one embodiment, the pressure regulating assembly further includes a spring fixing shaft and a spring fixing seat, the spring fixing shaft passes through the pressure regulating nut, the first spring is sleeved on the spring fixing shaft, one side of the spring fixing seat is in contact with the diaphragm, and the other side is provided with an annular groove that cooperates with the first spring.

[0011] In the above scheme, one end of the first spring is against the pressure-adjusting nut, and the other end is installed in the annular groove of the spring fixing seat and is against the bottom surface of the annular groove. The spring fixing shaft and the annular groove are used to limit and fix the first spring to prevent the first spring from deflecting. In addition, by setting the spring fixing seat, the first spring can be prevented from directly contacting the diaphragm, thereby preventing the diaphragm from being subjected to excessive force.

[0012] In one embodiment, a thread is provided on the outer side of the mounting seat, one end of the mounting seat is threadedly connected to the valve body, and the other end is threadedly connected to a locking cover, and a sealing gasket is provided between the locking cover and the mounting seat.

[0013] In the above scheme, a thread is provided on the side wall of the valve body at one end of the low-pressure chamber, which is used to be threadedly connected to the mounting seat. After the mounting seat is threadedly connected to the valve body, the diaphragm is pressed tightly to seal the low-pressure chamber. The locking cover is used to press the sealing gasket onto the mounting seat to seal the interior of the pressure regulating assembly.

[0014] In one embodiment, the switch assembly includes a sealing screw head, and a thread that cooperates with the sealing screw head is provided on the side wall of the high-pressure chamber. One end of the sealing screw head is sealed with the valve body, and the other end is provided with a sliding groove that cooperates with the piston column. The second spring is sleeved on the sealing screw head, and the two ends of the second spring are respectively against the step walls on the outside of the sealing screw head and the piston column.

[0015] In the above scheme, the piston column is inserted into the slide groove and is slidably connected to the slide groove. The piston column is limited by the slide groove to prevent the piston column from shifting during movement. The outer side of the sealing screw head and the outer side of the piston column are provided with protruding step walls, and the two ends of the second spring are located between the step walls to ensure that it functions normally.

[0016] In one embodiment, a connecting groove is formed at the end of the piston rod, the vertical rod is inserted into the connecting groove, and a sealing sleeve is provided at the end of the piston rod, wherein the sealing sleeve has a hole for the vertical rod to pass through.

[0017] In the above scheme, the connecting groove is slidably connected to the vertical rod, thereby limiting the valve stem to prevent the valve stem from shifting during movement. A sealing sleeve is provided on the end of the piston rod close to the valve port. The sealing sleeve is an elastic structure to enhance the sealing effect of the valve port. At the same time, it can also play a certain buffering role to prevent damage.

[0018] In one embodiment, a sealing ring is provided between the piston rod and the valve port, and a hole is opened on the sealing ring to match the valve port.

[0019] In the above solution, the sealing ring is an elastic structure, which cooperates with the sealing sleeve at the end of the piston rod to enhance the sealing effect of the valve port. The sealing ring is provided with a hole with the same inner diameter as the valve port for the vertical rod of the valve stem to pass through.

[0020] In one embodiment, the air intake assembly includes an air intake seat and a connecting bracket, one end of the air intake seat is inserted into the air inlet, and an air vent is provided at one end of the air intake seat located outside the air inlet. An air intake channel is opened inside the air intake seat, and a filter element is installed in the air intake channel. One end of the connecting bracket is sleeved on the air intake seat.

[0021] In the above scheme, the connecting bracket can be installed on the gas cylinder so that the vent on the gas inlet seat is connected to the gas cylinder valve of the gas cylinder. The high-pressure gas in the gas cylinder enters the internal gas inlet channel through the vent, and then enters the high-pressure chamber after being filtered by the filter element.

[0022] In one embodiment, the air intake assembly also includes a sealing structure, which includes a connecting rubber strip and a rubber cover provided at the end of the connecting rubber strip, the connecting rubber strip is sleeved on the air intake seat, the rubber cover cooperates with the air vent, and a locking knob is threadedly installed on one end of the connecting bracket away from the air intake seat, and the locking knob can be moved close to and away from the air vent.

[0023] In the above solution, when the intake valve is not in use, the rubber cover can be placed on the air vent of the intake seat, and the rubber cover can be pressed against the air vent by the locking knob to seal the interior and avoid contamination by impurities. When the intake valve is in use, the connecting bracket is installed on the gas cylinder and can also be locked and fixed by the locking knob to ensure a firm connection.

[0024] In one embodiment, the valve body is provided with a plurality of low-pressure interfaces and high-pressure interfaces, the low-pressure interfaces are communicated with the low-pressure chamber, and the high-pressure interfaces are communicated with the high-pressure chamber.

[0025] In the above solution, the low-pressure interface is used to connect to an external gas device or a pressure gauge, and the high-pressure interface can be installed with a pressure gauge to check the internal pressure.

[0026] Compared with the prior art, the present invention has the following beneficial effects: The high-pressure chamber and the low-pressure chamber of the present invention are connected to the outside from both ends of the valve body, which facilitates the installation of the switch assembly and the pressure regulating assembly from both sides, thereby improving assembly convenience. At the same time, it is also convenient to disassemble and maintain the switch assembly and the pressure regulating assembly separately, making the use of the pressure reducing valve more flexible and convenient. The valve stem of the present invention is provided with multiple guide rods and multiple matching jacks on the peripheral side of the valve port. The guide rods can play a limiting and guiding role when the valve stem moves, avoiding relative rotation between the diaphragm and the valve stem, thereby effectively preventing sprains, scratches, etc. from occurring during the internal movement of the pressure reducing valve, protecting the internal structure of the pressure reducing valve, improving the reliability of the pressure reducing valve, and effectively extending the service life of the pressure reducing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 FIG. 1 is a perspective view of a diaphragm-type gas pressure reducing valve according to an embodiment of the present invention.

[0029] Figure 2 Schematic diagram of the internal structure of a diaphragm gas pressure reducing valve.

[0030] Figure 3 This is a schematic diagram of the internal structure of a diaphragm-type gas pressure reducing valve (after removing the sealing structure).

[0031] Figure 4 A three-dimensional view of the valve body.

[0032] Figure 5 A three-dimensional diagram of the valve stem.

[0033] Figure 6 It is a partial cross-sectional view of a diaphragm type gas pressure reducing valve.

[0034] Description of reference numerals in the figures: 1-valve body; 11-high-pressure chamber; 111-sealing ring; 12-low-pressure chamber; 13-valve port; 14-jack; 15-air inlet; 16-high-pressure interface; 161-connecting hole; 17-low-pressure interface; 18-plug; 2-pressure regulating assembly; 21-mounting seat; 211-mounting groove; 22-pressure regulating nut; 23-first spring; 24-spring fixing shaft; 241-limiting part; 25-spring fixing seat; 251-annular groove; 26-sealing gasket; 27-locking cover; 3-switch assembly ;31-sealing screw head;311-slide groove;32-piston rod;321-connecting groove;322-sealing sleeve;33-second spring;4-diaphragm;5-valve stem;51-disc;52-vertical rod;53-guide rod;6-intake assembly;61-intake seat;611-air vent;612-intake channel;613-filter element;62-connecting bracket;621-card slot;622-locking knob;63-sealing structure;631-connecting rubber strip;632-rubber cover;7-sealing ring. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other. Example

[0039] Please refer to Figures 1 to 6In a non-limiting embodiment of the present invention, a diaphragm type gas pressure reducing valve is provided, which includes a valve body 1, an air inlet 15 is provided on the valve body 1, an air inlet assembly 6 is installed on the air inlet 15, the interior of the valve body 1 is divided into a high-pressure chamber 11 and a low-pressure chamber 12 by an inner wall, a valve port 13 is provided on the inner wall between the high-pressure chamber 11 and the low-pressure chamber 12, the high-pressure chamber 11 and the low-pressure chamber 12 are connected through the valve port 13, the air inlet 15 is connected to the high-pressure chamber 11, and a pressure regulating assembly 2 is connected to one end of the valve body 1 located in the low-pressure chamber 12, a diaphragm 4 is provided between the pressure regulating assembly 2 and the low-pressure chamber 12, and the regulating The pressure assembly 2 is in contact with the diaphragm 4, and the valve stem 5 is slidably installed on the valve port 13. The valve stem 5 includes a disc 51, a vertical rod 52 perpendicular to one side surface of the disc 51, and a plurality of guide rods 53 surrounding the vertical rod 52. The disc 51 is in contact with the diaphragm 4, and the vertical rod 52 is slidably inserted into the valve port 13. A plurality of sockets 14 cooperating with the guide rods 53 are provided around the circumference of the valve port 13. A switch assembly 3 is installed in the high-pressure chamber 11. The switch assembly 3 includes a piston column and a second spring 33. The piston column rests on the valve port 13 under the elastic force of the second spring 33, thereby closing the valve port.

[0040] Among them, since the switch assembly 3 and the pressure regulating assembly 2 need to be installed corresponding to the high-pressure chamber 11 and the low-pressure chamber 12 respectively, the high-pressure chamber 11 and the low-pressure chamber 12 are connected to the outside from both ends of the valve body 1, which is convenient for installing the switch assembly 3 and the pressure regulating assembly 2 respectively. At the same time, it is also convenient to disassemble and maintain the switch assembly 3 and the pressure regulating assembly 2, making the pressure reducing valve more flexible and convenient to use, and improving the convenience of use.

[0041] The pressure-regulating assembly 2 and the low-pressure chamber 12 are located on both sides of the diaphragm 4. The pressure-regulating assembly 2 is used to apply pressure to the diaphragm 4. When the pressure of the gas in the low-pressure chamber 12 on the diaphragm 4 is less than the pressure applied by the pressure-regulating assembly 2, the diaphragm 4 will deform and push the valve stem 5 to move. At this time, the vertical rod 52 of the valve stem 5 pushes the piston rod 32 open, so that the valve port 13 opens. When the pressure of the gas in the low-pressure chamber 12 on the diaphragm 4 is balanced with the pressure applied to the diaphragm 4 by the pressure-regulating assembly 2, the diaphragm 4 returns to its original state, and the piston rod 32 rests against the valve port 13 again under the elastic force of the second spring 33, closing the valve port 13. Therefore, the air pressure in the low-pressure chamber 12 can be controlled by adjusting the pressure applied to the diaphragm 4 by the pressure-regulating assembly 2, and the air pressure in the low-pressure chamber 12 can be kept stable to provide a stable air source to meet the needs of external air-using devices. When in use, under the initial pressure of the pressure regulating component 2, the valve port 13 is in an open state, the low-pressure chamber 12 is connected to the gas-using device, the air inlet component 6 is connected to the gas cylinder, and the high-pressure gas in the gas cylinder enters the high-pressure chamber 11 through the air inlet component 6 and the air inlet 15, and then enters the low-pressure chamber 12 through the valve port 13, and is converted into low-pressure gas. After the air pressure in the low-pressure chamber 12 reaches the set value, the valve port 13 is closed under the action of the piston column. As the low-pressure chamber 12 is supplied with air from the outside, when the air pressure in the low-pressure chamber 12 is lower than the required value, the valve port 13 will be closed under the action of the diaphragm 4 and the valve stem 5. Open it again to keep the air pressure in the low-pressure chamber 12 stable, wherein a plurality of guide rods 53 are provided around the vertical rod 52 of the valve stem 5, and the guide rods 53 are slidably inserted into the sockets 14 around the valve port 13, which can play a limiting and guiding role when the valve stem 5 moves, preventing the valve stem 5 from contacting the valve port 13 and causing scratches. At the same time, it can also prevent relative rotation between the diaphragm 4 and the valve stem 5 to avoid sprain of the diaphragm 4. Through the cooperation of the guide rods 53 and the sockets 14, sprains and scratches during the internal movement of the pressure reducing valve can be effectively avoided, thereby protecting the internal structure of the pressure reducing valve and improving its service life.

[0042] Preferably, the diameter of the vertical rod 52 is smaller than the inner diameter of the valve port 13, ensuring that there is a gap between the vertical rod 52 and the valve port 13 for gas to pass through. In addition, the vertical rod 52 and the valve port 13 are arranged coaxially to avoid contact between the vertical rod 52 and the side wall of the valve port 13, preventing scratches and other mechanical damage.

[0043] Please refer to Figure 3 The pressure regulating assembly 2 includes a mounting seat 21, a pressure regulating nut 22 and a first spring 23. The mounting seat 21 is provided with a threaded hole, and the outer side of the pressure regulating nut 22 is provided with a thread. The pressure regulating nut 22 is threadedly installed in the threaded hole. The first spring 23 is located between the pressure regulating nut 22 and the diaphragm 4. By rotating the pressure regulating nut 22, the compression amount of the first spring 23 can be adjusted, thereby adjusting the pressure applied to the diaphragm 4 to control the air pressure in the low-pressure chamber 12. The operation is convenient and quick.

[0044] Furthermore, the pressure regulating assembly 2 also includes a spring fixing shaft 24 and a spring fixing seat 25. The spring fixing shaft 24 is passed through the pressure regulating nut 22, and the first spring 23 is sleeved on the spring fixing shaft 24. One side of the spring fixing seat 25 is in contact with the diaphragm 4, and the other side is provided with an annular groove 251 that cooperates with the first spring 23. One end of the first spring 23 is against the pressure regulating nut 22, and the other end is installed in the annular groove 251 of the spring fixing seat 25, and is against the bottom surface of the annular groove 251. The spring fixing shaft 24 and the annular groove 251 are used to limit and fix the first spring 23 to prevent the first spring 23 from deflecting. In addition, by providing the spring fixing seat 25, the first spring 23 can be prevented from directly contacting the diaphragm 4, thereby preventing the diaphragm 4 from being subjected to excessive force.

[0045] Preferably, in this embodiment, a protruding limiting portion 241 is provided at one end of the spring fixing shaft 24 , and mounting grooves 211 are formed at both ends of the mounting seat 21 . The mounting grooves 211 are used to accommodate the limiting portion 241 of the spring fixing shaft 24 and the spring fixing seat 25 .

[0046] Preferably, the pressure-adjusting nut 22 is provided with a groove that matches the spring, and cooperates with the annular groove 251 to limit the two ends of the first spring 23, so that the installation of the first spring 23 is more stable.

[0047] Please refer to Figure 2 and Figure 3 , threads are provided at both ends of the outer side of the mounting seat 21, one end of the mounting seat 21 is threadedly connected to the valve body 1, and the other end is threadedly connected to a locking cover 27. The side wall of the valve body 1 at one end of the low-pressure chamber 12 is provided with threads for threaded connection with the mounting seat 21. When the mounting seat 21 is threadedly connected to the valve body 1, the diaphragm 4 is pressed tightly to ensure that the low-pressure chamber 12 is sealed. A sealing gasket 26 is provided between the locking cover 27 and the mounting seat 21. The locking cover 27 is used to press the sealing gasket 26 onto the mounting groove 211 at the outer end of the mounting seat 21, thereby sealing the interior of the pressure regulating assembly 2 to ensure sealing.

[0048] Please refer to Figure 2 and Figure 3When the cam 31 is in the closed position, the cam 31 is in the closed position, and the cam 31 is in the closed position, so that the cam 31 is in the open position and the cam 31 is in the closed position.

[0049] Preferably, a plurality of sealing rings 7 are sleeved on the outer side of the sealing screw head 31 to enhance the sealing performance with the valve body 1 and ensure the sealing effect on the high-pressure chamber 11 .

[0050] Please refer to Figure 3 The end of the piston rod 32 is provided with a connecting groove 321, and the vertical rod 52 is inserted in the connecting groove 321 and is slidably connected to the connecting groove 321. The connecting groove 321 can limit the valve stem 5 to prevent the valve stem 5 from deviating during movement. The end of the piston rod 32 is provided with a sealing sleeve 322, and the sealing sleeve 322 is provided with a hole for the vertical rod 52 to pass through. The sealing sleeve 322 is an elastic structure to enhance the sealing effect of the valve port 13. At the same time, it can also play a certain buffering role to prevent the piston rod 32 from being damaged. A sealing ring 111 is provided between the piston rod 32 and the valve port 13. The sealing ring 111 is an elastic structure. It cooperates with the sealing sleeve 322 at the end of the piston rod 32 to greatly enhance the sealing effect of the valve port 13 and prevent air leakage. The sealing ring 111 is provided with a hole with the same inner diameter as the valve port 13 for the vertical rod 52 of the valve stem 5 to pass through.

[0051] Preferably, a sealing ring 7 is sleeved on the outer side of the sealing ring 111 to enhance the sealing effect.

[0052] Please refer to Figures 1 to 3 The air intake assembly 6 includes an air intake seat 61 and a connecting bracket 62. One end of the air intake seat 61 is inserted into the air inlet 15. The end of the air intake seat 61 located outside the air inlet 15 is provided with an air vent 611. The air intake seat 61 is internally provided with an air intake channel 612 connected to the air vent 611. A filter element 613 is installed in the air intake channel 612. One end of the connecting bracket 62 is sleeved on the air intake seat 61. The connecting bracket 62 is provided with a card slot 621, which can be connected to the gas cylinder through the card slot 621, so that the air vent 611 on the air intake seat 61 is positioned and docked with the gas cylinder valve of the gas cylinder. The high-pressure gas in the gas cylinder can enter the air intake channel 612 through the air vent 611, and then enter the high-pressure chamber 11 after being filtered by the filter element 613.

[0053] The air intake assembly 6 also includes a sealing structure 63, which includes a connecting rubber strip 631 and a rubber cover 632 provided at the end of the connecting rubber strip 631. The connecting rubber strip 631 is sleeved on the part of the air intake seat 61 exposed to the outside of the air inlet 15, and is located between the valve body 1 and the connecting bracket 62. The connecting rubber strip 631 is pressed tightly by the connecting bracket 62, and the rubber cover 632 is matched with the air vent 611. A locking knob 622 is threadedly installed on the end of the connecting bracket 62 away from the air intake seat 61, and the locking knob 622 can be moved close to and away from the air vent 611. When the air intake valve is not in use, the connecting rubber strip 631 can be bent, and the rubber cover 632 can be covered on the air vent 611 of the air intake seat 61. The rubber cover 632 can be pressed against the air vent 611 by adjusting the locking knob 622 to seal the interior and avoid contamination by impurities. When the air intake valve is in use, after removing the rubber cover 632, the connecting bracket 62 can be stuck on the gas cylinder through the slot 621 and can be locked by the locking knob 622 to ensure a firm connection with the gas cylinder.

[0054] Preferably, the air inlet 15 is a stepped hole composed of two holes with different inner diameters. The hole with a smaller inner diameter is connected to the high-pressure chamber 11, and the hole with a larger inner diameter is used to install the air inlet seat 61. The hole wall of the hole with a larger inner diameter is provided with a thread, and the outer side of one end of the air inlet seat 61 inserted into the air inlet 15 is also provided with a matching thread, so that the air inlet seat 61 is threadedly connected to the air inlet hole, which is convenient for disassembly and assembly, thereby facilitating the cleaning and replacement of the filter element 613 inside the air inlet seat 61.

[0055] Preferably, a sealing ring 7 is provided between the air inlet seat 61 and the step wall of the air inlet 15 to enhance the sealing performance.

[0056] Please refer to Figure 1 and Figure 6 Several low-pressure interfaces 17 and high-pressure interfaces 16 are provided on both sides of the valve body 1. The low-pressure interface 17 is connected to the low-pressure chamber 12, and the high-pressure interface 16 is connected to the high-pressure chamber 11. The low-pressure interface 17 can be used to connect to an external gas-using device, or to install components such as pressure gauges and safety valves. The high-pressure interface 16 can be used to install components such as pressure gauges and safety valves.

[0057] A connecting hole 161 is provided between the high-pressure chamber 11 and the high-pressure interface 16 , and the high-pressure chamber 11 and the high-pressure interface 16 are connected through the connecting hole 161 .

[0058] Specifically, plugs 18 are installed in both the low-pressure interface 17 and the high-pressure interface 16. When the interfaces are not in use, they are sealed by the plugs 18. A sealing ring 7 is sleeved on the outside of the plug 18 to enhance the sealing effect.

[0059] Please refer to Figures 1 to 6In a non-limiting embodiment of the present invention, an underwater breathing apparatus is used as an example to illustrate the operating principle of the present invention. The pressure reducing valve can convert the high-pressure gas in the oxygen cylinder into low-pressure gas for the diver to breathe. When in use, the diver's underwater breathing apparatus is connected to the low-pressure interface 17 on the valve body 1 through a hose, thereby communicating with the low-pressure chamber 12. The connecting bracket 62 is installed on the oxygen cylinder, and the high-pressure gas in the oxygen cylinder enters the high-pressure chamber 11 through the vent 611. In the initial state, the valve port 13 is in an open state under the elastic force of the first spring 23, and the high-pressure gas in the high-pressure chamber 11 is released. It enters the low-pressure chamber 12 from the valve port 13 and is converted into low-pressure gas until the air pressure in the low-pressure chamber 12 reaches the set value and can maintain a balance with the pressure applied to the diaphragm 4 by the pressure regulating component 2. The diaphragm 4 recovers and the valve port 13 is closed. As the diver inhales, the air pressure in the low-pressure chamber 12 decreases. At this time, the pressure applied to the diaphragm 4 by the pressure regulating component 2 is greater than the pressure applied to the diaphragm 4 by the gas in the low-pressure chamber 12. The valve port 13 is reopened and the high-pressure gas can continue to enter the low-pressure chamber 12. Through the above cycle, the air pressure in the low-pressure chamber 12 can be kept stable, ensuring a stable air source for the diver.

[0060] Specifically, the pressure in the oxygen cylinder is usually 25MPa. After being reduced by this pressure reducing valve, it becomes 0.95±0.05MPa and can maintain a stable output.

[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 diaphragm type gas pressure reducing valve, comprising a valve body, wherein the valve body is provided with an air inlet, characterized in that: An air intake assembly is mounted on the air inlet. The interior of the valve body is divided into a high-pressure chamber and a low-pressure chamber by an inner wall. The high-pressure chamber and the low-pressure chamber are respectively connected to the outside from both ends of the valve body. A valve port is provided between the high-pressure chamber and the low-pressure chamber. The air inlet is connected to the high-pressure chamber. A pressure regulating assembly is connected to one end of the valve body located in the low-pressure chamber. A diaphragm is provided between the pressure regulating assembly and the low-pressure chamber. The pressure regulating assembly contacts the diaphragm and is used to apply pressure to the diaphragm. A valve stem is slidably mounted on the valve port. The valve stem includes a disc, a vertical rod perpendicular to one side surface of the disc, and a plurality of guide rods surrounding the vertical rod. The disc contacts the diaphragm. The vertical rod is slidably inserted into the valve port. A plurality of sockets cooperating with the guide rods are provided around the circumference of the valve port. A switch assembly is mounted in the high-pressure chamber. The switch assembly includes a piston column and a second spring. The piston column is pressed against the valve port under the elastic force of the second spring.

2. The diaphragm type gas pressure reducing valve according to claim 1, characterized in that: The pressure regulating assembly includes a mounting seat, a pressure regulating nut and a first spring. The mounting seat is provided with a threaded hole. The pressure regulating nut is threadedly installed in the threaded hole. The first spring is located between the pressure regulating nut and the diaphragm.

3. The diaphragm type gas pressure reducing valve according to claim 2, characterized in that: The pressure regulating assembly also includes a spring fixing shaft and a spring fixing seat. The spring fixing shaft passes through the pressure regulating nut. The first spring is sleeved on the spring fixing shaft. One side of the spring fixing seat is in contact with the diaphragm, and the other side is provided with an annular groove that cooperates with the first spring.

4. The diaphragm type gas pressure reducing valve according to claim 3, characterized in that: The outer side of the mounting seat is provided with a thread, one end of the mounting seat is threadedly connected to the valve body, and the other end is threadedly connected to a locking cover, and a sealing gasket is provided between the locking cover and the mounting seat.

5. The diaphragm type gas pressure reducing valve according to claim 1, characterized in that: The switch assembly includes a sealing screw head, and a thread that cooperates with the sealing screw head is provided on the side wall of the high-pressure chamber. One end of the sealing screw head is sealed with the valve body, and the other end is provided with a sliding groove that cooperates with the piston column. The second spring is sleeved on the sealing screw head, and the two ends of the second spring are respectively against the step wall on the outside of the sealing screw head and the piston column.

6. The diaphragm type gas pressure reducing valve according to claim 1, characterized in that: The end of the piston rod is provided with a connecting groove, the vertical rod is inserted into the connecting groove, the end of the piston rod is sleeved with a sealing sleeve, and the sealing sleeve is provided with a hole for the vertical rod to pass through.

7. The diaphragm type gas pressure reducing valve according to claim 6, characterized in that: A sealing ring is provided between the piston rod and the valve port, and a hole matching the valve port is opened on the sealing ring.

8. The diaphragm type gas pressure reducing valve according to claim 1, characterized in that: The air intake assembly includes an air intake seat and a connecting bracket. One end of the air intake seat is inserted into the air inlet. An air vent is provided at one end of the air intake seat located outside the air inlet. An air intake channel is opened inside the air intake seat. A filter element is installed in the air intake channel. One end of the connecting bracket is sleeved on the air intake seat.

9. The diaphragm type gas pressure reducing valve according to claim 8, characterized in that: The air intake assembly also includes a sealing structure, which includes a connecting rubber strip and a rubber cover provided at the end of the connecting rubber strip. The connecting rubber strip is sleeved on the air intake seat, and the rubber cover cooperates with the air vent. A locking knob is threadedly installed on the end of the connecting bracket away from the air intake seat, and the locking knob can be moved close to and away from the air vent.

10. The diaphragm type gas pressure reducing valve according to claim 1, characterized in that: The valve body is provided with a plurality of low-pressure interfaces and high-pressure interfaces. The low-pressure interfaces are communicated with the low-pressure chamber, and the high-pressure interfaces are communicated with the high-pressure chamber.

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