Diaphragm type pressure reducing valve

Abstract

The utility model relates to a diaphragm type pressure reducing valve which comprises a valve body, the interior of the valve body is divided into a high-pressure chamber and a low-pressure chamber through an inner wall, a valve port is formed between the high-pressure chamber and the low-pressure chamber, one end of the valve body is connected with a pressure regulating assembly, a diaphragm piece is arranged between the pressure regulating assembly and the low-pressure chamber, and the diaphragm piece is connected with the valve port. The pressure regulating assembly comprises a mounting base, a pressure regulating nut and a first spring, the first spring is located between the pressure regulating nut and the diaphragm piece, a valve rod is slidably mounted on the valve port and comprises a disc, a vertical rod and a plurality of guide rods, a plurality of insertion holes are formed in the peripheral side of the valve port, a switch assembly is mounted in the high-pressure chamber, and the switch assembly is connected with the disc. The switch assembly comprises a piston column and a second spring, a sealing ring is arranged between the piston rod and the valve port, and the piston column abuts against the sealing ring under the elastic force effect of the second spring. The sealing device has the advantages of convenience in assembly and use, long service life, good sealing effect and the like.

Description

Technical Field

[0001] This utility model relates to the field of pressure regulator technology, and in particular to a diaphragm pressure reducing valve. Background Technology

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

[0003] Current gas pressure reducing valves mainly include diaphragm type and piston type. Diaphragm type pressure reducing valves primarily sense pressure changes through an internal diaphragm. The deformation of the diaphragm moves a switching element installed in the valve port, controlling the opening and closing of the valve port to achieve pressure reduction and stabilization. Because pressure reducing valves have very high sealing requirements, the connections between components must be very tight. Existing diaphragm type pressure reducing valves typically have their components sequentially installed into the valve body. Subsequent disassembly or maintenance of internal structures requires complete removal, which is very difficult and inconvenient. Furthermore, the diaphragm deformation driving the valve port switching element can easily cause twisting or misalignment during movement, leading to contact with other internal structures and scratches on the switching element. Additionally, the relative rotation between the valve stem and the diaphragm can also cause torsional damage to the diaphragm. These scratches and twists occurring during the internal movement of the pressure reducing valve can prevent its normal operation and severely affect its service life. Utility Model Content

[0004] The purpose of this invention is to provide a diaphragm pressure reducing valve that is easy to assemble and use and can effectively extend its service life.

[0005] The objective of this utility model is achieved through the following technical solution.

[0006] A diaphragm-type pressure reducing valve includes a valve body with an air inlet. The valve body's interior 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, and the air inlet communicates with 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 includes a mounting base, a pressure regulating nut, and a first spring. The mounting base has a threaded hole, and the pressure regulating nut is threaded into the threaded hole. A spring is located between the pressure adjusting nut and 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 of the disc, and multiple guide rods surrounding the vertical rod. The disc contacts the diaphragm. The vertical rod is slidably inserted into the valve port. Multiple insertion holes that mate with the guide rods are arranged around the periphery of the valve port. A switching assembly is installed in the high-pressure chamber. The switching assembly includes a piston rod and a second spring. A sealing ring is provided between the piston rod and the valve port. The piston rod abuts against the sealing ring under the elastic force of the second spring.

[0007] In the above scheme, the high-pressure chamber and the low-pressure chamber are connected to the outside from both ends of the valve body, which facilitates the installation of the switching assembly and the pressure regulating assembly, and also facilitates the disassembly of the switching 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, pushing the valve stem to move. At this time, the vertical rod of the valve stem pushes the piston rod open, opening 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, under the elastic force of the second spring, presses against the valve port again, closing the valve port. The compression of the first spring can be controlled by adjusting the pressure regulating nut, thereby adjusting the pressure applied to the diaphragm, which can control the gas pressure in the low-pressure chamber and keep the gas pressure in the low-pressure chamber stable, so as to provide a stable gas source to meet the needs of external gas-using devices. In practical use, under the initial pressure of the pressure regulating component, the valve port is in the open state. The low-pressure chamber is connected to the gas-consuming device, and the air inlet component is connected to the gas cylinder. The high-pressure gas in the gas cylinder enters the high-pressure chamber through the air inlet component and the air inlet, and then enters the low-pressure chamber through the valve port, where it is converted into low-pressure gas. Once the pressure in the low-pressure chamber reaches the set value, the valve port closes under the action of the piston rod. As the low-pressure chamber supplies gas to the outside, when the pressure in the low-pressure chamber falls below the required value, the valve port reopens under the action of the diaphragm and valve stem to maintain stable pressure in the low-pressure chamber. The vertical rod of the valve stem... Multiple guide rods are arranged around the valve, which slide into the holes around the valve port. They limit and guide the movement of the valve rod, preventing scratches caused by contact between the valve rod and the valve port. At the same time, they prevent relative rotation between the diaphragm and the valve rod, thus preventing the diaphragm from twisting. The cooperation of the guide rods and holes effectively avoids twisting and scratching during the internal movement of the pressure reducing valve, protecting the internal structure of the pressure reducing valve and improving its service life. The sealing ring is an elastic structure, which can enhance the sealing effect of the piston rod on the valve port. The sealing ring has a hole with the same inner diameter as the valve port to allow the vertical rod of the valve to pass through.

[0008] 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.

[0009] In the above scheme, one end of the first spring abuts against the pressure adjusting nut, and the other end is installed in the annular groove of the spring fixing seat, abutting 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 shifting. In addition, by setting the spring fixing seat, the first spring can be prevented from directly contacting the diaphragm, thus preventing the diaphragm from being subjected to excessive force.

[0010] In one embodiment, the mounting base has threads on its outer side, one end of the mounting base is threaded to the valve body, and the other end is threaded to a locking cap, with a sealing gasket between the locking cap and the mounting base.

[0011] In the above scheme, the valve body has a thread on the side wall at one end of the low-pressure chamber for threaded connection with the mounting seat. After the mounting seat is threadedly connected to the valve body, it presses the diaphragm to seal the low-pressure chamber. The locking cover is used to press the sealing gasket onto the mounting seat to seal the inside of the pressure regulating component.

[0012] In one embodiment, the switching assembly includes a sealing screw head, and the side wall of the high-pressure chamber is provided with a thread that mates with the sealing screw head. One end of the sealing screw head is sealed to the valve body, and the other end has a groove that mates with the piston rod. A second spring is sleeved on the sealing screw head, and the two ends of the second spring abut against the stepped wall on the outer side of the sealing screw head and the piston rod, respectively.

[0013] In the above scheme, the piston rod is inserted into the slide groove and slidably connected with the slide groove. The slide groove limits the piston rod to prevent it from shifting during movement. The outer side of the sealing screw head and the outer side of the piston rod are provided with protruding stepped walls. The two ends of the second spring are located between the stepped walls to ensure that it functions properly.

[0014] In one embodiment, the piston rod has a connecting groove at its end, the vertical rod is inserted into the connecting groove, and a sealing sleeve is fitted onto the end of the piston rod, with a hole on the sealing sleeve for the vertical rod to pass through.

[0015] In the above scheme, the connecting groove is slidably connected to the vertical rod, thereby limiting the valve rod and preventing it from shifting during movement. A sealing sleeve is fitted on the end of the piston rod near the valve port. The sealing sleeve has an elastic structure to enhance the sealing effect on the valve port and also to provide a certain buffering effect to prevent damage.

[0016] In one embodiment, an air intake assembly is installed on the air intake port. 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 intake port, and the end of the air intake seat located outside the air intake port is provided with a vent. 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.

[0017] In the above scheme, the connecting bracket can be installed on the gas cylinder so that the air inlet on the air inlet seat is connected to the gas cylinder valve. The high-pressure gas in the gas cylinder enters the internal air inlet channel through the air inlet, and then enters the high-pressure chamber after being filtered by the filter element.

[0018] In one embodiment, the air intake assembly further includes a sealing structure, the sealing structure including a connecting strip and a rubber cap disposed at the end of the connecting strip, the connecting strip being sleeved on the air intake seat, the rubber cap cooperating with the air vent, and a locking knob being threadedly installed at the end of the connecting bracket away from the air intake seat, the locking knob being able to approach and move away from the air vent.

[0019] In the above solution, when the air intake valve is not in use, the rubber cap can be placed on the air vent of the air intake seat, and the rubber cap can be pressed tightly on the air vent by the locking knob to seal the inside and prevent impurities from contaminating it. When the air intake valve is in use, the connecting bracket is installed on the gas cylinder, and it can also be locked and fixed by the locking knob to ensure a stable connection.

[0020] In one embodiment, the inner wall of the air inlet is provided with threads, and the air inlet seat is threadedly connected to the air inlet.

[0021] In the above solution, by making the air intake seat threadedly connected to the air intake port, the air intake seat and the valve body form a detachable connection, which facilitates the cleaning or replacement of the filter element inside the air intake seat.

[0022] In one embodiment, the valve body is provided with a plurality of low-pressure ports and high-pressure ports, wherein the low-pressure ports are connected to the low-pressure chamber and the high-pressure ports are connected to the high-pressure chamber.

[0023] In the above scheme, the low-pressure interface is used to connect to an external gas device or pressure gauge, while the high-pressure interface can be fitted with a pressure gauge to check the internal pressure.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] The high-pressure chamber and low-pressure chamber of this utility model 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, improving the ease of assembly. At the same time, it also makes it easy to disassemble and maintain the switch assembly and the pressure regulating assembly separately, making the use of this pressure reducing valve more flexible and convenient.

[0026] The valve stem of this utility model is provided with multiple guide rods and multiple matching insertion holes on the periphery of the valve port. The guide rods can limit and guide the valve stem when it moves, preventing relative rotation between the diaphragm and the valve stem. This effectively prevents twisting, scratching, etc. during the internal movement of the pressure reducing valve, protects the internal structure of the pressure reducing valve, improves the reliability of the pressure reducing valve, and can effectively extend the service life of the pressure reducing valve.

[0027] This invention features a sealing ring between the valve port and the piston rod. The sealing ring is an elastic structure that enhances the sealing effect of the piston rod on the valve port and also acts as a buffer to prevent damage to the piston rod. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a perspective view of a diaphragm pressure reducing valve according to one embodiment.

[0030] Figure 2 This is a schematic diagram of the internal structure of a diaphragm pressure reducing valve.

[0031] Figure 3 This is a schematic diagram of the internal structure of a diaphragm pressure reducing valve (after removing the sealing structure).

[0032] Figure 4 This is a three-dimensional view of the valve body.

[0033] Figure 5 This is a 3D view of the valve stem.

[0034] Figure 6 This is a partial cross-sectional view of a diaphragm pressure reducing valve.

[0035] Explanation of the reference numerals in the figure:

[0036] 1-Valve body; 11-High pressure chamber; 111-Sealing ring; 12-Low pressure chamber; 13-Valve port; 14-Socket; 15-Air inlet; 16-High pressure interface; 161-Connection hole; 17-Low pressure interface; 18-Plug; 2-Pressure regulating assembly; 21-Mounting base; 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-Vent port; 612-Intake channel; 613-Filter element; 62-Connecting bracket; 621-Slot; 622-Locking knob; 63-Sealing structure; 631-Connecting rubber strip; 632-Rubber cap; 7-Sealing ring. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Example

[0041] Please refer to Figures 1 to 6 In a non-limiting embodiment of this utility model, a diaphragm-type pressure reducing valve is provided, which includes a valve body 1, an air inlet 15 on the valve body 1, an air inlet assembly 6 installed on the air inlet 15, a high-pressure chamber 11 and a low-pressure chamber 12 formed by an inner wall of the valve body 1, a valve port 13 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 being connected through the valve port 13, the air inlet 15 being connected to the high-pressure chamber 11, a pressure regulating assembly 2 connected to one end of the valve body 1 located in the low-pressure chamber 12, a diaphragm 4 being provided between the pressure regulating assembly 2 and the low-pressure chamber 12, and the pressure regulating assembly 4 being connected to the low-pressure chamber 12. The pressure assembly 2 contacts the diaphragm 4. A valve stem 5 is slidably installed in 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 multiple guide rods 53 surrounding the vertical rod 52. The disc 51 contacts the diaphragm 4. The vertical rod 52 is slidably inserted into the valve port 13. Multiple insertion holes 14 that cooperate with the guide rods 53 are arranged around the periphery of the valve port 13. A switch assembly 3 is installed in the high pressure chamber 11. The switch assembly 3 includes a piston rod and a second spring 33. The piston rod abuts against the valve port 13 under the elastic force of the second spring 33, which can close the valve port.

[0042] 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, and the high pressure chamber 11 and the low pressure chamber 12 are connected to the outside from both ends of the valve body 1, it is convenient to install 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 its ease of use.

[0043] The pressure regulating component 2 and the low-pressure chamber 12 are located on both sides of the diaphragm 4. The pressure regulating component 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 component 2, the diaphragm 4 will deform and push the valve rod 5 to move. At this time, the vertical rod 52 of the valve rod 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 component 2, the diaphragm 4 returns to its original shape, and the piston rod 32, under the elastic force of the second spring 33, abuts against the valve port 13 again, closing the valve port 13. Therefore, the pressure in the low-pressure chamber 12 can be controlled by adjusting the pressure applied to the diaphragm 4 by the pressure regulating component 2, and the pressure in the low-pressure chamber 12 can be kept stable to provide a stable gas source and meet the needs of external gas devices. In practical use, under the initial pressure of the pressure regulating component 2, the valve port 13 is in the open state, the low-pressure chamber 12 is connected to the gas supply device, and the air inlet component 6 is connected to the gas cylinder. 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, becoming low-pressure gas. Once the gas pressure in the low-pressure chamber 12 reaches the set value, the valve port 13 closes under the action of the piston rod. As the low-pressure chamber 12 supplies gas to the outside, when the gas pressure in the low-pressure chamber 12 is lower than the required value, the valve port 13 will close under the action of the diaphragm 4 and the valve stem 5. The valve is reopened to maintain stable air pressure in the low-pressure chamber 12. Multiple guide rods 53 are arranged around the vertical rod 52 of the valve stem 5. These guide rods 53 are slidably inserted into the insertion holes 14 around the valve port 13. They limit and guide the movement of the valve stem 5, preventing scratches caused by contact between the valve stem 5 and the valve port 13. Simultaneously, they prevent relative rotation between the diaphragm 4 and the valve stem 5, thus avoiding twisting of the diaphragm 4. The cooperation of the guide rods 53 and the insertion holes 14 effectively prevents twisting and scratching during the internal movement of the pressure reducing valve, protecting its internal structure and extending its service life.

[0044] 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 on the same axis to avoid the vertical rod 52 contacting the side wall of the valve port 13 and to prevent scratches and other mechanical damage.

[0045] Please refer to Figure 3The pressure regulating assembly 2 includes a mounting base 21, a pressure regulating nut 22, and a first spring 23. The mounting base 21 has a threaded hole, and the pressure regulating nut 22 has threads on its outer side. 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 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.

[0046] Furthermore, the pressure regulating assembly 2 also includes a spring fixing shaft 24 and a spring fixing seat 25. The spring fixing shaft 24 passes 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 abuts against the pressure regulating nut 22, and the other end is installed in the annular groove 251 of the spring fixing seat 25, abutting 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 shifting. In addition, by setting the spring fixing seat 25, the first spring 23 can be prevented from directly contacting the diaphragm 4, thus preventing the diaphragm 4 from being subjected to excessive force.

[0047] Preferably, in this embodiment, one end of the spring fixing shaft 24 is provided with a protruding limiting part 241, and both ends of the mounting base 21 are provided with mounting grooves 211, which are used to accommodate the limiting part 241 of the spring fixing shaft 24 and the spring fixing base 25.

[0048] Preferably, the pressure adjusting nut 22 is provided with a groove that cooperates with the spring, and together with the annular groove 251, it limits the two ends of the first spring 23, making the first spring 23 more securely installed.

[0049] Please refer to Figure 2 and Figure 3 The mounting base 21 has threads on both ends of its outer side. One end of the mounting base 21 is threaded to the valve body 1, and the other end is threaded to the locking cover 27. The valve body 1 has threads on the side wall at one end of the low-pressure chamber 12 for threaded connection with the mounting base 21. When the mounting base 21 is threaded to the valve body 1, it presses the diaphragm 4 to ensure that the low-pressure chamber 12 is sealed. A sealing gasket 26 is provided between the locking cover 27 and the mounting base 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 base 21, thereby sealing the inside of the pressure regulating component 2 and ensuring the sealing performance.

[0050] Please refer to Figure 2 and Figure 3The switch assembly 3 includes a sealing screw head 31 with threads on its side wall. The high-pressure chamber 11 has threads on its side wall that mate with the sealing screw head 31. One end of the sealing screw head 31 is inserted into the high-pressure chamber 11, and the other end is sealed to the valve body 1, thereby sealing the high-pressure chamber 11. The end of the sealing screw head 31 inserted into the high-pressure chamber 11 has a groove 311 that mates with the piston rod. The piston rod is inserted into the groove 311 and slidably connected to the groove 311. The groove 311 limits the piston rod to prevent it from shifting during movement. A second spring 33 is sleeved on the sealing screw head 31. Both the outer side of the sealing screw head 31 and the outer side of the piston rod have protruding stepped walls. The two ends of the second spring 33 abut against the stepped walls on the outer sides of the sealing screw head 31 and the piston rod, respectively, to ensure that it can perform its compression and reset functions normally.

[0051] Preferably, a plurality of sealing rings 7 are fitted on the outer side of the sealing screw head 31 to enhance the sealing between it and the valve body 1 and ensure the sealing effect on the high pressure chamber 11.

[0052] Please refer to Figure 3 The piston rod 32 has a connecting groove 321 at its end. The vertical rod 52 is inserted into the connecting groove 321 and is slidably connected to the connecting groove 321. The connecting groove 321 can limit the valve rod 5 to prevent the valve rod 5 from shifting during movement. The piston rod 32 has a sealing sleeve 322 at its end. The sealing sleeve 322 has a hole for the vertical rod 52 to pass through. The sealing sleeve 322 is an elastic structure to enhance the sealing effect on the valve port 13 and also to provide a certain buffering effect 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. Together with the sealing sleeve 322 at the end of the piston rod 32, it can greatly enhance the sealing effect on the valve port 13 and prevent air leakage. The sealing ring 111 has a hole with the same inner diameter as the valve port 13 to allow the vertical rod 52 of the valve rod 5 to pass through.

[0053] Preferably, a sealing ring 7 is fitted onto the outer side of the sealing ring 111 to enhance the sealing effect.

[0054] 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 intake port 15. The end of the air intake seat 61 located outside the air intake port 15 is provided with a vent 611. An air intake channel 612 communicating with the vent 611 is opened inside the air intake seat 61. 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. A slot 621 is opened on the connecting bracket 62. It can be locked onto the gas cylinder through the slot 621, so that the vent 611 on the air intake seat 61 is positioned and connected 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 vent 611, and then enter the high-pressure chamber 11 after being filtered by the filter element 613.

[0055] The intake assembly 6 also includes a sealing structure 63, which includes a connecting strip 631 and a cap 632 located at the end of the connecting strip 631. The connecting strip 631 is sleeved on the part of the intake seat 61 that is exposed outside the intake port 15 and is located between the valve body 1 and the connecting bracket 62. The connecting bracket 62 presses the connecting strip 631 tightly. The cap 632 cooperates with the vent 611. A locking knob 622 is threaded on the end of the connecting bracket 62 away from the intake seat 61. The locking knob 622 can be moved closer to or away from the vent 611. When the air intake valve is not in use, the connecting rubber strip 631 can be bent, and the rubber cap 632 can be placed on the air vent 611 of the air intake seat 61. The rubber cap 632 can be pressed tightly on the air vent 611 by adjusting the locking knob 622 to seal the inside and prevent impurities from contaminating it. When the air intake valve is in use, the rubber cap 632 can be removed, and the connecting bracket 62 can be clipped onto the gas cylinder through the slot 621. It can then be locked by the locking knob 622 to ensure a stable connection with the gas cylinder.

[0056] Preferably, the air inlet 15 is a stepped hole composed of two holes with different inner diameters. The hole with the smaller inner diameter is connected to the high-pressure chamber 11, and the hole with the larger inner diameter is used to install the air inlet seat 61. The hole wall of the hole with the larger inner diameter is provided with threads, and the outer side of the end of the air inlet seat 61 that is inserted into the air inlet 15 is also provided with matching threads, so that the air inlet seat 61 and the air inlet are threadedly connected, which is convenient for disassembly and assembly, and thus facilitates the cleaning and replacement of the filter element 613 inside the air inlet seat 61.

[0057] Preferably, a sealing ring 7 is provided between the air intake seat 61 and the stepped wall of the air intake 15 to enhance the sealing performance.

[0058] Please refer to Figure 1 and Figure 6 The valve body 1 has several low-pressure ports 17 and high-pressure ports 16 on both sides. The low-pressure ports 17 are connected to the low-pressure chamber 12, and the high-pressure ports 16 are connected to the high-pressure chamber 11. The low-pressure ports 17 can be used to connect to external gas devices or to install pressure gauges, safety valves and other components. The high-pressure ports 16 can be used to install pressure gauges, safety valves and other components.

[0059] A connection hole 161 is provided between the high-voltage chamber 11 and the high-voltage interface 16, through which the high-voltage chamber 11 and the high-voltage interface 16 are connected.

[0060] Specifically, both the low-pressure port 17 and the high-pressure port 16 are equipped with plugs 18. When the ports are not in use, they are sealed by the plugs 18. A sealing ring 7 is fitted over the plug 18 to enhance the sealing effect.

[0061] Please refer to Figures 1 to 6In a non-limiting embodiment of this utility model, taking an underwater breathing apparatus as an external air supply device as an example, the working principle of this utility model is explained. This pressure reducing valve can convert the high-pressure gas in the oxygen cylinder into low-pressure gas for the diver to breathe. In specific use, the diver's underwater breathing apparatus is connected to the low-pressure port 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. 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 the open state under the action of the spring force of the first spring 23, and the high pressure in the high-pressure chamber 11 is... Gas enters the low-pressure chamber 12 through valve port 13, transforming into low-pressure gas. When the gas pressure in the low-pressure chamber 12 reaches the set value and can maintain balance with the pressure applied to the diaphragm 4 by the pressure regulating component 2, the diaphragm 4 reopens, and valve port 13 closes. As the diver inhales, the gas 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, and valve port 13 reopens, allowing high-pressure gas to continue entering the low-pressure chamber 12. Through the above cycle, the gas pressure in the low-pressure chamber 12 can be kept stable, ensuring a stable gas source for the diver.

[0062] Specifically, the pressure inside the oxygen cylinder is usually 25 MPa. After being reduced by this pressure reducing valve, it is changed to 0.95 ± 0.05 MPa and can maintain a stable output.

[0063] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0064] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0065] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A diaphragm-type pressure reducing valve, comprising a valve body, wherein the valve body is provided with an air inlet, characterized in that, The valve body is internally 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 includes a mounting base, a pressure regulating nut, and a first spring. The mounting base has a threaded hole, and the pressure regulating nut is threaded into the threaded hole. The first spring is located between the pressure regulating nut and the... Between the diaphragms, 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 multiple guide rods surrounding the vertical rod. The disc contacts the diaphragm, and the vertical rod is slidably inserted into the valve port. Multiple insertion holes that mate with the guide rods are arranged around the periphery of the valve port. A switching assembly is installed in the high-pressure chamber. The switching assembly includes a piston rod and a second spring. A sealing ring is provided between the piston rod and the valve port. The piston rod abuts against the sealing ring under the elastic force of the second spring.

2. The diaphragm pressure reducing valve according to claim 1, 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, and 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.

3. The diaphragm pressure reducing valve according to claim 2, characterized in that, The mounting base has threads on its outer side. One end of the mounting base is threaded to the valve body, and the other end is threaded to a locking cap. A sealing gasket is provided between the locking cap and the mounting base.

4. The diaphragm pressure reducing valve according to claim 2, characterized in that, The end of the spring fixing shaft away from the spring fixing seat has a protruding limiting part, and both ends of the mounting seat have mounting grooves. The limiting part and the spring fixing seat are respectively located in the two mounting grooves.

5. The diaphragm pressure reducing valve according to claim 1, characterized in that, The switching assembly includes a sealing screw head. The side wall of the high-pressure chamber is provided with a thread that mates with the sealing screw head. One end of the sealing screw head is sealed to the valve body, and the other end has a groove that mates with the piston rod. The second spring is sleeved on the sealing screw head, and the two ends of the second spring abut against the stepped wall on the outside of the sealing screw head and the piston rod, respectively.

6. The diaphragm pressure reducing valve according to claim 1, characterized in that, The piston rod has a connecting groove at its end, the vertical rod is inserted into the connecting groove, and a sealing sleeve is fitted onto the end of the piston rod, with a hole on the sealing sleeve for the vertical rod to pass through.

7. The diaphragm pressure reducing valve according to claim 1, characterized in that, An air intake assembly is installed on the air intake port. 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 intake port. The end of the air intake seat located outside the air intake port is provided with a vent. 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.

8. The diaphragm pressure reducing valve according to claim 7, characterized in that, The air intake assembly also includes a sealing structure, which includes a connecting rubber strip and a rubber cap at the end of the connecting rubber strip. The connecting rubber strip is sleeved on the air intake seat, and the rubber cap cooperates with the air vent. A locking knob is threaded on the end of the connecting bracket away from the air intake seat. The locking knob can be close to or away from the air vent.

9. The diaphragm pressure reducing valve according to claim 7, characterized in that, The inner wall of the air inlet is threaded, and the air inlet seat is threadedly connected to the air inlet.

10. The diaphragm pressure reducing valve according to claim 1, characterized in that, The valve body is provided with several low-pressure ports and high-pressure ports. The low-pressure ports are connected to the low-pressure chamber, and the high-pressure ports are connected to the high-pressure chamber.

Images