Pressure reduction control valve capable of automatically controlling gas supply and gas cylinder assembly

Abstract

The utility model discloses a pressure reduction control valve capable of automatically controlling air supply, which comprises a valve body, an air inlet arranged on the valve body and used for being connected with an air source, a valve cavity arranged in the valve body, an air outlet arranged on the valve body and communicated with the valve cavity, and a trigger rod extending out of the valve body from the air outlet, the hole diameter of the air outlet is larger than the diameter of the trigger rod, the first end of the trigger rod is located in the valve body and provided with a blocking plug used for blocking the air outlet, and the second end of the trigger rod is located outside the valve body and provided with a blocking piece. The trigger rod is sleeved with a first spring which pushes the blocking plug to seal and block the air outlet, the first end of the first spring is elastically connected with the blocking piece in an abutting mode, and the second end of the first spring is elastically connected with the outer wall face of the valve body in an abutting mode.

Description

Technical Field

[0001] The utility model relates to the field of valves, and more specifically to a pressure reducing control valve for automatically controlling gas replenishment and a gas cylinder component. Background Art

[0002] In the field of firefighting, many existing protective devices are equipped with small oxygen cylinders and supply oxygen to the inside of the protective device. Most existing oxygen supply devices require manual triggering of the oxygen supply switch, and cannot be automatically triggered according to the reduction of gas inside the protective device. When the user performs self-rescue, due to the complex environment, it is difficult for the user to accurately control the oxygen cylinder to effectively and appropriately supply oxygen in a complex environment. This makes it inconvenient for the existing protective device to supply oxygen to the user evenly, stably and effectively, and the practicality is poor. Utility Model Content

[0003] The utility model aims at the above defects of the prior art and provides a pressure reducing control valve and a gas cylinder assembly for automatically controlling gas replenishment.

[0004] The technical solution adopted by the utility model to solve its technical problem is: constructing a pressure-reducing control valve for automatically controlling air replenishment, wherein the pressure-reducing control valve comprises a valve body, an air inlet arranged on the valve body for connecting to an air source, a valve cavity arranged in the valve body, an air outlet arranged on the valve body and communicating with the valve cavity, and a trigger rod extending from the air outlet to the outside of the valve body, wherein the aperture of the air outlet is larger than the diameter of the trigger rod, the first end of the trigger rod is located in the valve body, and a stopper for blocking the air outlet is provided on the first end of the trigger rod, the second end of the trigger rod is located outside the valve body, and a stopper is provided on the second end of the trigger rod, the first spring is sleeved on the trigger rod to push the stopper to seal and block the air outlet, the first end of the first spring is elastically abutted against the stopper, and the second end of the first spring is elastically abutted against the outer wall of the valve body.

[0005] In the automatic controlled air replenishment pressure reducing control valve described in the utility model, at least two pressure reducing balancing pistons for reducing the pressure of the airflow are arranged in the valve cavity along the outflow direction of the airflow, and each of the at least two pressure reducing balancing pistons is provided with a spring that can be used to push the pressure reducing balancing piston to open the airflow channel.

[0006] In the automatic controlled air replenishment pressure reducing control valve described in the utility model, a partition is provided in the middle of the valve cavity to separate the valve cavity into a first chamber and a second chamber, a first air intake passage connecting the air inlet and the first chamber is also provided in the valve body, a second air intake passage connecting the first chamber and the second chamber is provided on the partition, a first piston is provided in the first chamber, which is sealed and movably arranged in the first chamber and can block the first air intake passage, and a second piston is provided in the second chamber, which is sealed and movably arranged in the second chamber and can block the second air intake passage.

[0007] In the automatic controlled air replenishment pressure reducing control valve described in the utility model, the first piston is provided with a first air flow hole penetrating the first piston, the second piston is provided with a second air flow hole penetrating the second piston, the first piston is sleeved with a second spring for pushing the first piston to open the first air intake channel, and the second piston is sleeved with a third spring for pushing the second piston to open the second air intake channel.

[0008] In the automatic controlled air replenishment pressure reducing control valve described in the utility model, the first chamber is fixedly provided with a first sleeve on which the first end of the second spring can be sleeved, and the second chamber is fixedly provided with a second sleeve on which the first end of the third spring can be sleeved, the first end of the first piston is sealably inserted into the first sleeve, and the first end outer wall of the first piston is provided with a first convex ring protruding from the outer wall of the first piston, and the first convex ring abuts against the inner wall of the first sleeve, the first end of the second piston is sealably inserted into the second sleeve, and the first end outer wall of the second piston is provided with a second convex ring protruding from the outer wall of the second piston, and the second convex ring abuts against the inner wall of the second sleeve.

[0009] In the automatic controlled air replenishment pressure reducing control valve described in the utility model, a third convex ring protruding from the outer wall of the first piston is provided on the outer wall of the second end of the first piston, and the third convex ring abuts against the inner wall of the first chamber, and a fourth convex ring protruding from the outer wall of the second piston is provided on the outer wall of the second end of the second piston, and the fourth convex ring abuts against the inner wall of the second chamber.

[0010] In the automatic controlled air replenishment pressure reducing control valve described in the utility model, the first end aperture of the first air flow hole is smaller than the second end aperture of the first air flow hole, a first reduced diameter portion is provided in the middle portion of the first piston, the first end aperture of the second air flow hole is smaller than the second end aperture of the second air flow hole, and a second reduced diameter portion is provided in the middle portion of the second piston.

[0011] In the automatic control air replenishment pressure reducing control valve of the utility model, the first convex ring is sleeved with a first sealing ring abutting against the inner wall of the first sleeve, the second convex ring is sleeved with a second sealing ring abutting against the inner wall of the second sleeve, the third convex ring is sleeved with a third sealing ring abutting against the inner wall of the first chamber, and the fourth convex ring is sleeved with a fourth sealing ring abutting against the inner wall of the second chamber;

[0012] The valve body is also provided with a first pressure relief hole communicating with the first chamber, and a second pressure relief hole communicating with the second chamber.

[0013] In the automatic control air replenishment pressure reducing control valve of the utility model, at least one first washer is provided outside the first sleeve and located at the first end of the second spring, and at least one second washer is provided outside the second sleeve and located at the first end of the third spring;

[0014] The valve body is also provided with a third pressure relief hole and a pressure relief assembly arranged in the third pressure relief hole. The third pressure relief hole is located on the side wall of the valve cavity between the second piston and the stopper. A accommodating cavity for accommodating the pressure relief assembly is provided in the middle of the third pressure relief hole. The aperture of the accommodating cavity is larger than the aperture of the third pressure relief hole. The pressure relief assembly includes a fourth spring and a sealing ball. The bottom end of the fourth spring elastically abuts against the bottom wall of the accommodating cavity, and the top end of the fourth spring abuts against the top end of the sealing ball and pushes the sealing ball to seal the third pressure relief hole.

[0015] In the automatic control air replenishment pressure reducing control valve of the utility model, the pressure reducing control valve further comprises a charging port arranged on the valve body and connected with the air inlet, and a hexagon socket bolt cover arranged at the charging port;

[0016] And / or, the pressure reducing control valve further comprises a main valve switch arranged on the valve body for controlling the disconnection or connection between the air inlet and the first air inlet passage;

[0017] And / or, the pressure reducing control valve further comprises a pressure gauge disposed on the valve body and connected to the air inlet.

[0018] Another technical solution adopted by the utility model to solve its technical problem is: constructing a gas cylinder assembly, which includes an oxygen cylinder and the above-mentioned pressure reducing control valve, and the pressure reducing control valve is installed on the bottle mouth of the oxygen cylinder through the air inlet.

[0019] The implementation of the automatic control gas replenishment pressure reducing control valve and gas cylinder assembly of the utility model has the following beneficial effects: when the automatic control gas replenishment pressure reducing control valve of the utility model is used, when the gas in the airbag or protective cover is reduced to only one third, the airbag or protective cover becomes deflated due to the effect of atmospheric pressure, so that the inner wall of the airbag or protective cover pushes the second end of the trigger rod and its baffle, at this time the trigger rod is tilted, the trigger rod drives the baffle to tilt and no longer completely blocks the gas outlet, at this time the high-pressure oxygen in the oxygen cylinder can enter the airbag through the valve cavity and the gas outlet of the control valve to oxygenate the airbag or protective cover. During the oxygenation process of the airbag or protective cover, the airbag or protective cover gradually swells, so that the inner wall of the airbag or protective cover is separated from the trigger rod and the baffle, and the trigger rod drives the baffle again under the elastic restoring force of the first spring to seal and block the gas outlet, stop oxygenating the airbag or protective cover, thereby realizing automatic oxygenation, and the user can continue to inhale oxygen from the airbag or protective cover. When using the pressure reducing control valve for automatic air replenishment of the present application, the user no longer needs to manually operate the oxygen cylinder or the control valve. When the air pressure in the airbag or the protective cover is too low, automatic oxygen replenishment can be achieved by automatically triggering the trigger rod, thereby reducing the difficulty of operation for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0021] Figure 1 It is a structural schematic diagram of the gas cylinder assembly of the utility model;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of the pressure reducing control valve for automatically controlling air replenishment of the utility model;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the gas cylinder assembly of the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-3 As shown, in the first embodiment of the pressure reducing control valve for automatically controlling air replenishment of the utility model, the pressure reducing control valve 28 includes a valve body 29, an air inlet 30 provided on the valve body 29 for connecting to an air source, a valve cavity provided in the valve body 29, an air outlet 31 provided on the valve body 29 and communicating with the valve cavity, and a trigger rod 32 extending from the air outlet 31 to the outside of the valve body 29, the aperture of the air outlet 31 is larger than the diameter of the trigger rod 32, and the first end of the trigger rod 32 is A stopper 33 for blocking the air outlet 31 is provided on the first end of the trigger rod 32 which is located inside the valve body 29, and the second end of the trigger rod 32 is located outside the valve body 29, and a stopper 34 is provided on the second end of the trigger rod 32. A first spring 35 is sleeved on the trigger rod 32 to push the stopper 33 to seal and block the air outlet 31, and the first end of the first spring 35 elastically abuts against the stopper 34, and the second end of the first spring 35 elastically abuts against the outer wall of the valve body 29.

[0026] It is understandable that the pressure reducing control valve 28 needs to be used together with the oxygen cylinder 17, the protective cover or the air bag, etc. The oxygen cylinder 17 supplies oxygen to the protective cover or the air bag through the pressure reducing control valve 28.

[0027] When the decompression control valve for automatic air replenishment of the utility model is used, when the gas in the airbag or protective cover is reduced to only one third, the airbag or protective cover becomes deflated due to the atmospheric pressure, so that the inner wall of the airbag or protective cover pushes the second end of the trigger rod 32 and its baffle 34. At this time, the trigger rod 32 is tilted, and the trigger rod 32 drives the baffle 33 to tilt and no longer completely blocks the gas outlet 31. At this time, the high-pressure oxygen in the oxygen cylinder 17 can enter the airbag through the valve cavity of the control valve 28 and the gas outlet 31 to oxygenate the airbag or protective cover. During the oxygenation process of the airbag or protective cover, the airbag or protective cover gradually swells, so that the inner wall of the airbag or protective cover is separated from the trigger rod 32 and the baffle 34. The trigger rod 32 drives the baffle 33 again under the elastic restoring force of the first spring 35 to seal and block the gas outlet 31, and stops oxygenating the airbag or protective cover, thereby realizing automatic oxygenation, and the user can continue to inhale oxygen from the airbag or protective cover. When using the automatic control air replenishment pressure reducing control valve 28 of the present application, the user no longer needs to manually operate the oxygen cylinder 17 or the control valve 28. When the air pressure in the airbag or the protective cover is too low, automatic oxygen replenishment can be achieved by automatically triggering the trigger rod 32, which reduces the user's operating difficulty.

[0028] Specifically, in order to achieve a better pressure reducing and balancing effect, at least two pressure reducing and balancing pistons 39 and 40 for reducing the pressure of the airflow are arranged in the valve chamber along the outflow direction of the airflow, and each of the at least two pressure reducing and balancing pistons is provided with a spring 43 and 44 that can be used to push the pressure reducing and balancing piston to open the airflow channel.

[0029] In the present application, by providing at least two decompression balancing pistons (including two decompression balancing pistons), when the oxygen in the oxygen cylinder 17 flows out, two-stage balanced decompression can be performed through the two decompression balancing pistons, which can improve the stability of gas outflow and prevent the high-pressure gas from flowing out and causing damage to the airbag. By providing at least two decompression balancing pistons, the air pressure of the airflow flowing out of the air outlet 31 is greatly reduced, and the air pressure of the gas flowing into the airbag is more stable.

[0030] Preferably, Figure 2 As shown, the pressure reducing control valve 28 is a double piston pressure reducing control valve 28, which realizes double-stage piston pressure reducing by double pistons, and makes the air pressure in the pressure reducing control valve 28 reach balance. Specifically, a partition 36 is provided in the middle of the valve cavity to separate the valve cavity into a first chamber 37 and a second chamber 38, and a first air inlet passage 41 connecting the air inlet 30 and the first chamber 37 is also provided in the valve body 29, and a second air inlet passage 42 connecting the first chamber 37 and the second chamber 38 is provided on the partition 36, and a first piston 39 is provided in the first chamber 37, which is sealed and movably arranged in the first chamber 37 and can block the first air inlet passage 41, and a second piston 40 is provided in the second chamber 38, which is sealed and movably arranged in the second chamber 38 and can block the second air inlet passage 42.

[0031] Furthermore, the first piston 39 is provided with a first air flow hole 51 that passes through the first piston 39, the second piston 40 is provided with a second air flow hole 52 that passes through the second piston 40, the first piston 39 is sleeved with a second spring 43 that pushes the first piston 39 to open the first air intake channel 41, and the second piston 40 is sleeved with a third spring 44 that pushes the second piston 40 to open the second air intake channel 42.

[0032] Furthermore, the first chamber 37 is fixedly provided with a first sleeve 45 on which the first end of the second spring 43 can be sleeved, and the second chamber 38 is fixedly provided with a second sleeve 46 on which the first end of the third spring 44 can be sleeved, the first end of the first piston 39 is sealably inserted into the first sleeve 45, and the first end outer wall of the first piston 39 is provided with a first convex ring 47 protruding from the outer wall of the first piston 39, and the first convex ring 47 abuts against the inner wall of the first sleeve 45, the first end of the second piston 40 is sealably inserted into the second sleeve 46, and the first end outer wall of the second piston 40 is provided with a second convex ring 48 protruding from the outer wall of the second piston 40, and the second convex ring 48 abuts against the inner wall of the second sleeve 46.

[0033] Furthermore, a third convex ring 49 is provided on the outer side wall of the second end of the first piston 39 and protrudes from the outer side wall of the first piston 39, and the third convex ring 49 abuts against the inner wall of the first chamber 37. A fourth convex ring 50 is provided on the outer side wall of the second end of the second piston 40 and protrudes from the outer side wall of the second piston 40, and the fourth convex ring 50 abuts against the inner wall of the second chamber 38.

[0034] Furthermore, the first end aperture of the first air flow hole 51 is smaller than the second end aperture of the first air flow hole 51 , a first reduced diameter portion 53 is provided in the middle of the first piston 39 , the first end aperture of the second air flow hole 52 is smaller than the second end aperture of the second air flow hole 52 , and a second reduced diameter portion 54 is provided in the middle of the second piston 40 .

[0035] When the trigger rod 32 is tilted, the stopper 33 no longer completely blocks the air outlet 31, and oxygen flows out from the air inlet 30, the first air inlet channel 41, the first air hole 51, the second air inlet channel 42, and the second air hole 52 through the air outlet 31. When the air pressure in the first chamber 37 and the second chamber 38 is too high, the air pressure pushes the first reduced diameter portion 53 and the second reduced diameter portion 54 in the opposite direction, so that the first piston 39 moves toward the rear end of the first chamber 37, and the second piston 40 moves toward the partition 36, until the end of the first piston 39 abuts against the rear end wall of the first chamber 37, and the end of the second piston 40 abuts against the side wall of the partition 36, the first air hole 51 and the second air hole 52 are blocked, and the gas in the oxygen cylinder 17 no longer enters the first chamber 37 and the second chamber 38. Until the oxygen in the first chamber 37 and the second chamber 38 gradually flows out from the gas outlet 31, under the elastic restoring force of the second spring 43 and the third spring 44, the first piston 39 and the second piston 40 move away from the tail end wall of the first chamber 37 and the partition 36, so that the first air flow hole 51 and the second air flow hole 52 are connected, and the oxygen in the oxygen cylinder 17 enters the first chamber 37 and the second chamber 38 again. Repeat the above process until the oxygen in the protective cover or the air bag is replenished, the trigger rod 32 is no longer tilted, the first spring 35 drives the stopper 33 to seal and block the gas outlet 31, and the oxygen cylinder 17 completes the automatic oxygen supply to the protective cover or the air bag.

[0036] In the present application, a double piston is provided, and due to the different force areas at both ends of the piston, the pressure at the small end is smaller, and the pressure at the large end is larger. When the force on the large head section is greater than the force on the small head and the elastic force of the spring, the first air flow hole 51 and the second air flow hole 52 are blocked, thereby achieving decompression.

[0037] In the present application, by providing a double piston for decompression, a better stable inflation effect can be achieved, preventing the excessive air pressure in the oxygen cylinder 17 from causing damage to the protective cover or the airbag.

[0038] In order to achieve a better sealing effect, the first convex ring 47 is provided with a first sealing ring abutting against the inner wall of the first sleeve 45, the second convex ring 48 is provided with a second sealing ring abutting against the inner wall of the second sleeve 46, the third convex ring 49 is provided with a third sealing ring abutting against the inner wall of the first chamber 37, and the fourth convex ring 50 is provided with a fourth sealing ring abutting against the inner wall of the second chamber 38.

[0039] Furthermore, the valve body 29 is also provided with a first pressure relief hole 55 communicating with the first chamber 37 , and a second pressure relief hole communicating with the second chamber 38 .

[0040] To facilitate adjustment of the elastic force of the second spring 43 and the third spring 44 , at least one first washer 56 is provided outside the first sleeve 45 at the first end of the second spring 43 , and at least one second washer 57 is provided outside the second sleeve 46 at the first end of the third spring 44 .

[0041] When the elastic force of the second spring 43 and the third spring 44 needs to be increased, more first washers 56 and second washers 57 can be added, or the thickness of the first washers 56 and second washers 57 can be increased. When the elastic force of the second spring 43 and the third spring 44 needs to be weakened, fewer first washers 56 and second washers 57 can be added, or the thickness of the first washers 56 and second washers 57 can be reduced.

[0042] Furthermore, in order to prevent the air pressure in the valve body 29 from being too high, the valve body 29 is also provided with a third pressure relief hole 58 and a pressure relief component arranged in the third pressure relief hole 58. The third pressure relief hole 58 is located on the side wall of the valve cavity between the second piston 40 and the plug 33. A accommodating cavity for accommodating the pressure relief component is provided in the middle of the third pressure relief hole 58. The aperture of the accommodating cavity is larger than the aperture of the third pressure relief hole 58. The pressure relief component includes a fourth spring 59 and a sealing ball 60. The bottom end of the fourth spring 59 elastically abuts against the bottom wall of the accommodating cavity, and the top end of the fourth spring 59 abuts against the top end of the sealing ball 60 and pushes the sealing ball 60 to seal the third pressure relief hole 58.

[0043] When the air pressure in the valve cavity is too high, the high-pressure gas pushes the sealing ball 60 downward, and the fourth spring 59 is compressed, the sealing ball 60 is separated from the third pressure relief hole 58, and the gas is discharged from the third pressure relief hole 58. When the air pressure in the valve cavity is lower, the fourth spring 59 pushes the sealing ring to block the third pressure relief hole 58 again under the action of its own elastic restoring force to prevent gas leakage.

[0044] In this embodiment, the pressure reducing control valve 28 further includes a charging port 61 disposed on the valve body 29 and communicating with the air inlet 30 , and a hexagon socket bolt cover 62 covering the charging port 61 .

[0045] When the oxygen in the oxygen cylinder 17 is insufficient, the hexagon socket bolt cover 62 can be opened and the oxygen cylinder 17 can be inflated through the inflation port 61 .

[0046] Furthermore, the pressure reducing control valve 28 also includes a main valve switch 63 disposed on the valve body 29 for controlling the disconnection or connection between the air inlet 30 and the first air inlet passage 41 .

[0047] The user can pull the safety pin on the main valve switch 63 to drive the piston rod of the main valve switch 63 to move, thereby opening the air inlet 30 and the first air inlet channel 41. When the safety pin is released, the piston rod restores the closure of the air inlet 30 and the first air inlet channel 41 under the push of the spring.

[0048] Furthermore, the pressure reducing control valve 28 also includes a pressure gauge disposed on the valve body 29 and connected to the air inlet 30 .

[0049] Furthermore, the pressure reducing control valve 28 also includes a safety valve (not shown) disposed on the valve body 29 and connected to the air inlet 30 . The safety valve is used to open the safety valve to release part of the oxygen and reduce the air pressure in the oxygen cylinder 17 when the oxygen pressure in the oxygen cylinder 17 is too high.

[0050] In the first embodiment of the gas cylinder assembly of the utility model, the gas cylinder assembly includes an oxygen cylinder 17 and the above-mentioned pressure reducing control valve 28 , and the pressure reducing control valve 28 is installed at the bottle mouth of the oxygen cylinder 17 through the air inlet 30 .

[0051] Specifically, the pressure reducing control valve 28 includes a valve body 29, an air inlet 30 provided on the valve body 29 for connecting to an air source, a valve cavity provided in the valve body 29, an air outlet 31 provided on the valve body 29 and communicating with the valve cavity, and a trigger rod 32 extending from the air outlet 31 to the outside of the valve body 29, wherein the aperture of the air outlet 31 is larger than the diameter of the trigger rod 32, the first end of the trigger rod 32 is located in the valve body 29, and a stopper 33 for blocking the air outlet 31 is provided on the first end of the trigger rod 32, the second end of the trigger rod 32 is located outside the valve body 29, and a stopper 34 is provided on the second end of the trigger rod 32, and a first spring 35 for pushing the stopper 33 to seal and block the air outlet 31 is sleeved on the trigger rod 32, the first end of the first spring 35 is elastically abutted against the stopper 34, and the second end of the first spring 35 is elastically abutted against the outer wall of the valve body 29.

[0052] It is understandable that the pressure reducing control valve 28 needs to be used together with the oxygen cylinder 17, the protective cover or the air bag, etc. The oxygen cylinder 17 supplies oxygen to the protective cover or the air bag through the pressure reducing control valve 28.

[0053] During use, when the gas in the airbag or protective cover is reduced to only one third, the airbag or protective cover is deflated by the atmospheric pressure, so that the inner wall of the airbag or protective cover pushes against the second end of the trigger rod 32 and its baffle 34. At this time, the trigger rod 32 is tilted, and the trigger rod 32 drives the baffle 33 to tilt and no longer completely blocks the gas outlet 31. At this time, the high-pressure oxygen in the oxygen cylinder 17 can enter the airbag through the valve cavity of the control valve 28 and the gas outlet 31 to oxygenate the airbag or protective cover. During the oxygenation process of the airbag or protective cover, the airbag or protective cover gradually swells, so that the inner wall of the airbag or protective cover is separated from the trigger rod 32 and the baffle 34. The trigger rod 32 drives the baffle 33 again under the elastic restoring force of the first spring 35 to seal and block the gas outlet 31, and stops oxygenating the airbag or protective cover, thereby realizing automatic oxygen supplementation, and the user can continue to inhale oxygen from the airbag or protective cover. When using the automatic control air replenishment pressure reducing control valve 28 of the present application, the user no longer needs to manually operate the oxygen cylinder 17 or the control valve 28. When the air pressure in the airbag or the protective cover is too low, automatic oxygen replenishment can be achieved by automatically triggering the trigger rod 32, which reduces the user's operating difficulty.

[0054] Specifically, the pressure reducing control valve 28 is the double-piston pressure reducing control valve 28 as described above.

[0055] In addition, in the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pressure reducing control valve for automatically controlling air replenishment, characterized in that: The pressure reducing control valve comprises a valve body, an air inlet arranged on the valve body for connecting to an air source, a valve cavity arranged in the valve body, an air outlet arranged on the valve body and communicating with the valve cavity, and a trigger rod extending from the air outlet to outside the valve body, wherein the aperture of the air outlet is larger than the diameter of the trigger rod, the first end of the trigger rod is located in the valve body, and a stopper for blocking the air outlet is provided on the first end of the trigger rod, the second end of the trigger rod is located outside the valve body, and a stopper is provided on the second end of the trigger rod, a first spring is sleeved on the trigger rod to push the stopper to seal and block the air outlet, the first end of the first spring is elastically abutted against the stopper, and the second end of the first spring is elastically abutted against the outer wall of the valve body.

2. The pressure reducing control valve for automatically controlling air supply according to claim 1, characterized in that: At least two pressure reducing balancing pistons for reducing the pressure of the airflow are arranged in the valve cavity along the outflow direction of the airflow, and each of the at least two pressure reducing balancing pistons is provided with a spring that can be used to push the pressure reducing balancing piston to open the airflow channel.

3. The pressure reducing control valve for automatically controlling air supply according to claim 2, characterized in that: A partition is provided in the middle of the valve cavity to separate the valve cavity into a first chamber and a second chamber. A first air inlet passage connecting the air inlet and the first chamber is also provided in the valve body. A second air inlet passage connecting the first chamber and the second chamber is provided on the partition. A first piston is provided in the first chamber and is sealably movably arranged in the first chamber and can block the first air inlet passage. A second piston is provided in the second chamber and is sealably movably arranged in the second chamber and can block the second air inlet passage.

4. The pressure reducing control valve for automatically controlling air supply according to claim 3, characterized in that: A first air flow hole penetrating the first piston is provided in the first piston, a second air flow hole penetrating the second piston is provided in the second piston, a second spring for pushing the first piston to open the first air intake passage is sleeved on the first piston, and a third spring for pushing the second piston to open the second air intake passage is sleeved on the second piston.

5. The pressure reducing control valve for automatically controlling air supply according to claim 4, characterized in that: The first chamber is fixedly provided with a first sleeve on which the first end of the second spring can be sleeved, and the second chamber is fixedly provided with a second sleeve on which the first end of the third spring can be sleeved, the first end of the first piston is sealably inserted into the first sleeve, and the first end outer wall of the first piston is provided with a first convex ring protruding from the outer wall of the first piston, and the first convex ring abuts against the inner wall of the first sleeve, the first end of the second piston is sealably inserted into the second sleeve, and the first end outer wall of the second piston is provided with a second convex ring protruding from the outer wall of the second piston, and the second convex ring abuts against the inner wall of the second sleeve.

6. The pressure reducing control valve for automatically controlling air supply according to claim 5, characterized in that: A third convex ring protruding from the outer wall of the first piston is provided on the outer wall of the second end of the first piston, and the third convex ring abuts against the inner wall of the first chamber. A fourth convex ring protruding from the outer wall of the second piston is provided on the outer wall of the second end of the second piston, and the fourth convex ring abuts against the inner wall of the second chamber.

7. The pressure reducing control valve for automatically controlling air supply according to claim 6, characterized in that: The first end aperture of the first air flow hole is smaller than the second end aperture of the first air flow hole, a first reduced diameter portion is provided in the middle of the first piston, the first end aperture of the second air flow hole is smaller than the second end aperture of the second air flow hole, and a second reduced diameter portion is provided in the middle of the second piston.

8. The pressure reducing control valve for automatically controlling air supply according to claim 7, characterized in that: The first convex ring is sleeved with a first sealing ring abutting against the inner wall of the first sleeve, the second convex ring is sleeved with a second sealing ring abutting against the inner wall of the second sleeve, the third convex ring is sleeved with a third sealing ring abutting against the inner wall of the first chamber, and the fourth convex ring is sleeved with a fourth sealing ring abutting against the inner wall of the second chamber; The valve body is also provided with a first pressure relief hole communicating with the first chamber, and a second pressure relief hole communicating with the second chamber.

9. The pressure reducing control valve for automatically controlling air supply according to claim 7, characterized in that: At least one first washer is provided outside the first sleeve and located at the first end of the second spring, and at least one second washer is provided outside the second sleeve and located at the first end of the third spring; The valve body is also provided with a third pressure relief hole and a pressure relief assembly arranged in the third pressure relief hole. The third pressure relief hole is located on the side wall of the valve cavity between the second piston and the stopper. A accommodating cavity for accommodating the pressure relief assembly is provided in the middle of the third pressure relief hole. The aperture of the accommodating cavity is larger than the aperture of the third pressure relief hole. The pressure relief assembly includes a fourth spring and a sealing ball. The bottom end of the fourth spring elastically abuts against the bottom wall of the accommodating cavity, and the top end of the fourth spring abuts against the top end of the sealing ball and pushes the sealing ball to seal the third pressure relief hole.

10. The pressure reducing control valve for automatically controlling air supply according to claim 3, characterized in that: The pressure reducing control valve further comprises a charging port disposed on the valve body and communicating with the air inlet, and a hexagon socket bolt cover disposed on the charging port; And / or, the pressure reducing control valve further comprises a main valve switch arranged on the valve body for controlling the disconnection or connection between the air inlet and the first air inlet passage; And / or, the pressure reducing control valve further comprises a pressure gauge disposed on the valve body and connected to the air inlet.

11. A gas cylinder assembly, characterized in that: The gas cylinder assembly comprises an oxygen cylinder and a pressure reducing control valve as described in any one of claims 1 to 10, wherein the pressure reducing control valve is installed at the bottle mouth of the oxygen cylinder through an air inlet.

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