Negative pressure exhaust valve

Abstract

The present invention relates to the field of gas combustion appliances, and specifically to a negative pressure outlet valve. The negative pressure outlet valve comprises a valve body, a valve plate, a valve stem, a connecting assembly and a diaphragm; a gas chamber is arranged in the valve body, and the gas chamber comprises a positive pressure air inlet chamber, a negative pressure air outlet chamber and a normal pressure chamber. The change of the connection state between the positive pressure air inlet chamber and the negative pressure air outlet chamber is achieved by moving the valve plate, and the negative pressure air outlet chamber is separated from the normal pressure chamber by a diaphragm; the positive pressure air inlet chamber is connected to the outside world through the positive pressure air inlet, the negative pressure air outlet chamber is connected to the outside world through the negative pressure air outlet, and the normal pressure chamber is connected to the outside world through the balanced breathing hole; one end of the valve stem is connected to the valve plate, and the other end is connected to the diaphragm through the connecting assembly. The present invention can only be connected to the gas-using equipment when the gas supply system is under negative pressure, and cannot be connected to the gas-using equipment under positive pressure, thereby avoiding gas leakage into the room and ensuring the safety of use.

Description

Technical Field

[0001] The invention relates to the field of gas combustion appliances, and in particular to a negative pressure gas outlet valve. Background Art

[0002] At present, the front-end gas source supply of indoor gas equipment of industrial, commercial and residential gas users is basically supplied in a positive pressure mode with a certain relative pressure value, such as 1KPa-8KPa. Therefore, there is a risk of leakage of positive pressure gas with a relatively high pressure in the pipeline to the relatively low pressure indoor environment with normal pressure in the gas supply pipeline from the entrance to the indoor gas equipment. Therefore, this traditional gas supply method always has a huge safety hazard of fire accidents or even explosion accidents caused by accidental gas leakage. Many major safety accidents that have occurred in the use of gas users for a long time are also due to this.

[0003] The gas flowing through the pipelines of the traditional user indoor gas supply system is in a positive pressure state with a certain relative pressure value for a long time. Due to the positive pressure difference with the indoor environment space at normal pressure, there is always a risk of gas in the system leaking to the indoor environment space at normal pressure due to accidents such as poor sealing, accidental damage, system aging, operational errors, and human damage. Furthermore, the higher the pressure value of the gas in the system, the greater the positive pressure difference, the faster the gas leaks when encountering an accidental leakage, the more gas leaks per unit time, and the higher the risk caused.

[0004] That is to say, how to provide a safe gas supply system to prevent gas from leaking into the room is a technical problem that needs to be solved urgently in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a negative pressure gas outlet valve, which can limit the relative pressure value in the gas supply system so that the relative pressure in the system is in a negative pressure state, thereby avoiding the phenomenon of gas leakage into the room.

[0006] The embodiment of the present invention is achieved as follows:

[0007] A negative pressure air outlet valve, comprising a valve body, a valve plate, a valve stem, a connecting assembly and a diaphragm; a gas chamber is arranged in the valve body, the gas chamber comprises a positive pressure air inlet chamber, a negative pressure air outlet chamber and a normal pressure chamber, the positive pressure air inlet chamber and the negative pressure air outlet chamber are connected to each other by the movement of the valve plate, and the negative pressure air outlet chamber is separated from the normal pressure chamber by the diaphragm;

[0008] The positive pressure air inlet chamber is connected to the outside world through the positive pressure air inlet, the negative pressure air outlet chamber is connected to the outside world through the negative pressure air outlet, and the normal pressure chamber is connected to the outside world through the balanced breathing hole;

[0009] One end of the valve stem is connected to the valve plate, and the other end of the valve stem is connected to the diaphragm through the connecting assembly. The valve stem is used to drive the valve plate to move under the action of the diaphragm.

[0010] Preferably, the negative pressure air outlet valve further comprises a lever assembly, and the valve stem is connected to the connecting assembly via the lever assembly.

[0011] Preferably, the lever assembly comprises a first lever, a first bracket, a second lever, a second bracket and a movable lifting ring;

[0012] One end of the first lever is rotatably connected to the connecting assembly, the other end of the first lever is rotatably connected to one end of the movable hanging ring, one end of the first bracket is fixedly arranged on the inner wall of the negative pressure outlet chamber, and the other end of the first bracket is rotatably connected to the first lever;

[0013] The other end of the movable lifting ring is rotatably connected to one end of the second lever, the other end of the second lever is rotatably connected to one end of the valve stem away from the valve plate, one end of the second bracket is fixedly arranged on the inner wall of the negative pressure outlet chamber, and the other end of the second bracket is rotatably connected to the second lever.

[0014] Preferably, the lever assemblies are at least two groups, and the lever assemblies are evenly arranged with the valve stem as the axis.

[0015] Preferably, a hand valve chamber is provided between the positive pressure air inlet and the positive pressure air inlet chamber, the hand valve chamber is connected with the positive pressure air inlet through a first connecting conduit, and the hand valve chamber is connected with the positive pressure air inlet chamber through a second connecting conduit; a truncated cone-shaped sealing valve port is provided at one end of the first connecting conduit close to the hand valve chamber;

[0016] One end of the manual valve is slidably arranged in the manual valve chamber, and is used to manually realize the on-off of the air intake, and when the gas is in an unsaturated state, the booster gas equipment and the booster device can be in a low-pressure shutdown alarm prompt state in a flow limiting manner.

[0017] Preferably, the manual valve comprises a valve core, a manual valve guide tube, a manual valve push rod, a second spring and a manual valve wheel;

[0018] The valve core includes a first truncated cone and a first cylinder, the first truncated cone and the first cylinder are coaxially arranged, and the large bottom surface of the first truncated cone is connected to the first cylinder.

[0019] Preferably, the valve core further comprises a second truncated cone and a second cylinder, the first truncated cone, the first cylinder, the second truncated cone and the second cylinder are all coaxially arranged, the small bottom surface of the second truncated cone is connected to an end of the first cylinder away from the first truncated cone, and the second cylinder is connected to a large bottom surface of the second truncated cone; the second truncated cone and the truncated cone-shaped sealing valve port can form a contact seal; one end of the hand valve conduit is closed, the closed end abuts against the second cylinder, and the diameter of the hand valve conduit is smaller than the diameter of the second cylinder;

[0020] One end of the hand valve push rod is slidably disposed in the hand valve guide tube, and the other end is fixedly connected to the hand valve wheel, and the hand valve push rod is threadedly disposed on the valve body;

[0021] The second spring is sleeved on the outside of the hand valve conduit, one end of the second spring abuts against one end of the cylinder, and the other end abuts against the inner wall of the hand valve chamber;

[0022] The hand valve conduit is connected to one end of the second cylinder away from the second truncated cone.

[0023] Preferably, the valve plate is arranged in the positive pressure air inlet chamber, and a first spring is arranged in the positive pressure air inlet chamber, one end of the first spring abuts against the valve plate, and the other end abuts against the inner wall of the positive pressure air inlet chamber, and the first spring is used to drive the valve plate to perform a valve closing action.

[0024] Preferably, the valve plate is arranged in the positive pressure air inlet chamber, and a connecting rod and a disc are arranged in the negative pressure air outlet chamber;

[0025] One end of the connecting rod is connected to one side of the valve plate, and the other end of the connecting rod is fixedly connected to the disc;

[0026] A first spring is sleeved on the connecting rod, one end of the first spring abuts against the side wall of the negative pressure air outlet chamber, and the other end abuts against the disc, and the first spring is used to drive the disc to move away from the positive pressure air inlet chamber; the first spring is used to drive the valve plate to perform a valve closing action.

[0027] Preferably, the positive-pressure air inlet chamber is connected to the negative-pressure air outlet chamber via a first valve port, and a sealing structure is provided on a side of the valve plate close to the first valve port, for ensuring isolation between the positive-pressure air inlet chamber and the negative-pressure air outlet chamber after closing the valve plate.

[0028] Preferably, a conical structure is further provided on one side of the valve plate close to the valve stem, and a second valve port is further provided in the positive pressure air inlet chamber, and the second valve port is conical;

[0029] The outer side surface of the conical structure is matched with the inner side surface of the conical second valve port. A sealing ring is arranged on the outer side surface of the conical structure around the axis of the conical structure. The sealing ring and the conical structure seal between the valve plate and the second valve port after the sealing structure fails.

[0030] The beneficial effects of the embodiments of the present invention are:

[0031] The negative pressure air outlet valve is connected to the pipeline of the air supply system. When the negative pressure air outlet chamber in the negative pressure air outlet valve is under negative pressure, the diaphragm drives the valve stem to move, and then the valve stem drives the valve plate to move to open the valve plate, so that the positive pressure air inlet chamber and the negative pressure air outlet chamber are connected to achieve normal air supply; when the negative pressure air outlet chamber is under positive pressure or normal pressure or the negative pressure is insufficient, the diaphragm has insufficient valve opening force, and the valve plate closes the positive pressure air inlet chamber and the negative pressure air outlet chamber, making it impossible to supply air.

[0032] The arrangement of the present invention ensures that the negative pressure air outlet valve will only be opened when the gas supply system is under negative pressure, and the gas supply system can be connected with the indoor gas-using equipment through the negative pressure air outlet valve of the present invention to supply gas to the gas-using equipment. When the gas supply system is under positive pressure, the negative pressure air outlet valve is closed, and the gas supply system cannot be connected with the indoor gas-using equipment, thereby avoiding gas leakage into the room and ensuring safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a negative pressure air outlet valve provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of another arrangement of a valve plate of a negative pressure air outlet valve provided in an embodiment of the present invention;

[0035] Figure 3 for Figure 1 A magnified image of point A;

[0036] Figure 4 A schematic diagram of the open valve state of the negative pressure air outlet valve provided in an embodiment of the present invention;

[0037] Figure 5 A schematic structural diagram of another negative pressure air outlet valve provided in an embodiment of the present invention;

[0038] Figure 6 for Figure 5 Schematic diagram of the first left-view structure;

[0039] Figure 7 for Figure 5 A second left-view structure diagram;

[0040] Figure 8 for Figure 5The enlarged view of point B;

[0041] Fig. 9 for Figure 5 Enlarged view of point C (gas is saturated);

[0042] Fig.10 for Figure 5 Enlarged view of point C (gas is in an unsaturated state);

[0043] Fig.11 for Figure 5 Enlarged view of point C (closed state);

[0044] Fig.12 A front view of a valve stem of a negative pressure air outlet valve provided in an embodiment of the present invention;

[0045] Fig.13 for Fig.12 A top view of

[0046] Fig.14 for Fig.12 Side view of

[0047] Fig.15 for Figure 5 Schematic diagram of the maximum valve opening state of the negative pressure outlet valve shown.

[0048] Explanation of reference numerals: 1-valve body; 2-inlet end connecting flange; 3-positive pressure inlet port; 4-positive pressure inlet chamber; 5-valve plate; 6-sealing structure; 7-first spring; 8-valve port; 9-sealing port; 10-negative pressure outlet chamber; 11-partition wall; 12-diaphragm; 13-normal pressure chamber; 14-balanced breathing hole; 15-cover; 16-connecting assembly; 17-valve stem; 18-elevator guide sleeve; 19-fixing bracket; 20-negative pressure outlet port; 21-outlet end connecting flange; 22-round Disk; 23-connecting rod; 24-conical surface; 25-conical valve port; 26-sealing rubber ring; 27-first connecting conduit; 28-hand valve chamber; 29-hand valve wheel; 30-second connecting conduit; 31-movable lifting ring; 32-second lever; 33-first lever; 34-third connecting conduit; 35-check valve; 36-sealing plug; 37-filling port; 38-through valve; 39-valve core; 40-hand valve conduit; 41-hand valve top rod; 42-base; 43-second spring; 44-guide wing. DETAILED DESCRIPTION

[0049] Combine the following Figures 1 to 15 , some embodiments of the present invention are described in detail. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0050] Embodiment 1

[0051] like Figure 1 As shown, a negative pressure air outlet valve comprises a valve body, a valve plate, a valve stem, a connecting assembly and a diaphragm; a gas chamber is arranged in the valve body, the gas chamber comprises a positive pressure air inlet chamber, a negative pressure air outlet chamber and a normal pressure chamber, the positive pressure air inlet chamber and the negative pressure air outlet chamber are connected to each other by the movement of the valve plate to achieve the change of the connection state, and the negative pressure air outlet chamber and the normal pressure chamber are separated by a diaphragm; the positive pressure air inlet chamber is connected to the outside world through the positive pressure air inlet port, the negative pressure air outlet chamber is connected to the outside world through the negative pressure air outlet port, and the normal pressure chamber is connected to the outside world through the balanced breathing hole; one end of the valve stem is connected to the valve plate, and the other end of the valve stem is connected to the diaphragm through the connecting assembly, and the valve stem is used to drive the valve plate to move under the action of the diaphragm.

[0052] The valve body 1 serves as the main structure of the negative pressure outlet valve, and is responsible for connecting the main chamber structure of the valve body and other valve body components and installing the fixed base 42.

[0053] The valve body 1 is provided with an air inlet connection flange 2, which is used to connect with a conventional positive pressure gas supply system to obtain its gas output.

[0054] A positive pressure air inlet 3 is provided behind the air inlet end connecting flange 2, and its diameter is matched with the general pipeline specifications of the gas pipeline project according to the rated gas design flux of the negative pressure air outlet valve.

[0055] Specifically, the gas chamber in the valve body 1 is divided into three parts, namely a positive pressure air inlet chamber 4, a negative pressure air outlet chamber 10 and a normal pressure chamber 13. The positive pressure air inlet chamber 4 is connected to the air source through the positive pressure air inlet 3, and the negative pressure air outlet chamber 10 is connected to the air-using device through the negative pressure air outlet 20, so as to deliver the air source to the air-using device.

[0056] More specifically, the gas-using device is a gas combustion device, and the gas source is a positive-pressure gas supply system.

[0057] A positive pressure air inlet chamber 4 is provided behind the positive pressure air inlet 3, and a valve plate 5 is provided in the positive pressure air inlet chamber 4. A sealing structure 6 is coaxially provided on the valve plate 5. The sealing structure 6 is fixed on the valve plate 5 and axially close to the side of the valve port 8. The valve plate 5 is coaxially arranged with the sealing structure 6, the first spring 7, the valve port 8, and the sealing port 9.

[0058] The first spring 7 is a compression spring, and the compression spring is arranged in the positive-pressure air intake chamber 4 .

[0059] It should be pointed out that the first spring 7 can be configured as a compression spring, but it is not limited to a compression spring. It can also be other elastic devices, such as a tension spring, or a spring sheet, as long as it can achieve the resetting of the valve stem 17.

[0060] The sealing structure 6 is used as a sealing device to ensure the sealing performance between the positive pressure air inlet chamber 4 and the negative pressure air outlet chamber 10 .

[0061] like Figure 1 In the direction shown, the valve plate 5 is fixed on the upper end of the first spring 7, and the lower end of the first spring 7 is fixed on the bottom of the valve body 1. The function of the valve plate 5 is to apply a certain positive valve closing pressure to the side of the valve port 8 under the joint action of the first spring 7 and the gas pressure in the positive pressure inlet chamber 4, and form a sealed valve closing state between the sealing structure 6 and the sealing port 9, cut off the gas in the positive pressure inlet chamber 4, and output it to the negative pressure outlet chamber 10 through the valve port 8; when the valve plate 5 is subjected to the reverse valve opening force of the valve stem 17 in the negative pressure outlet chamber 10, and when the reverse valve opening force is greater than the positive valve closing pressure formed by the joint action of the first spring 7 and the gas pressure in the positive pressure inlet chamber 4, the valve plate 5 together with the sealing structure 6 is subjected to the reverse valve opening force, moves toward the side away from the valve port 8, and then releases the sealed valve closing state between the sealing structure 6 and the sealing port 9, and changes from the closed valve state to the open valve state; when the reverse valve opening force is less than the positive valve closing pressure again, the closed valve state is restored again, and the dynamic cycle reciprocating action is repeated.

[0062] A valve port 8 is provided in the positive pressure air inlet chamber 4, the air inlet end of the valve port 8 is connected to the positive pressure air inlet chamber 4, and the air outlet end of the valve port 8 is connected to the negative pressure air outlet chamber 10, and the diameter of the valve port 8 matches the rated gas flux of the negative pressure air outlet valve.

[0063] A sealing port 9 is provided at the edge of the inlet end of the valve port 8, and its function is to utilize its relatively sharp circular arc protrusion to increase the contact pressure with the sealing structure 6, thereby enhancing the sealing effect when the valve is closed. Its sharpness, sharp angle, and protrusion height should also take into account the durability of the sealing structure 6, such as the sealing rubber. It should not be too sharp to cause the sealing structure 6 to fail quickly.

[0064] A negative pressure outlet chamber 10 is provided at the outlet end of the valve port 8, and a semi-enclosed partition wall 11 is provided in the chamber. As viewed from the figure, the partition wall 11 divides the chamber into two upper and lower compartments. The upper end surface of the partition wall 11, i.e., the side facing the upper compartment, is a conical shape with a large diameter end at the top and a small diameter end at the bottom. The partition wall 11 is provided with a plurality of vent holes to facilitate the dynamic balance of pressure in the upper and lower compartments.

[0065] A diaphragm 12 is provided in the upper compartment, and the diaphragm 12 is made of rubber; the upper part of the diaphragm 12 is a normal pressure chamber 13, and the lower part is connected to the negative pressure outlet chamber 10. The main function of the diaphragm 12 is to serve as a sealing isolation component between the negative pressure outlet chamber 10 and the normal pressure chamber 13. At the same time, when negative pressure is generated in the negative pressure outlet chamber 10, it is affected by the pressure difference between the atmospheric pressure in the normal pressure chamber 13 and the negative pressure in the negative pressure outlet chamber 10, and when the pressure generated by the pressure difference and the fixed area of ​​the diaphragm 12, that is, the reverse valve opening force is greater than the positive valve closing force on the valve plate 5, the diaphragm 12 acts as a force receiving / force applying element, driving the valve stem 17 to move downward to realize the valve opening action.

[0066] A certain spacing dimension is designed between the upper end surface of the partition wall 11 in the upper compartment and the diaphragm 12 in the valve closed state. This spacing dimension determines the maximum opening degree of the valve plate 5. The size of the opening degree matches the gas design flux of the valve port 8 and is calculated with reference to the diameter of the sealing port 9 and the valve stem 17 or the connecting rod 23. The upper end surface of the partition wall 11 serves as a limit for the diaphragm 12 to prevent the diaphragm 12 from being damaged due to excessive valve opening displacement.

[0067] A valve stem 17 and a push rod guide sleeve 18 are provided in the negative pressure outlet chamber 10 .

[0068] The upper end of the valve stem 17 is fixedly connected to the diaphragm 12 through the connecting assembly 16, and the push rod guide sleeve 18 is fixed to the inner wall of the lower chamber through the fixing bracket 19. The lower end of the valve stem 17 is hemispherical, and the hemispherical lower end is in non-fixed contact with the valve plate 5, such as abutment, in order to allow the radial and axial angles of the valve plate 5 to have a certain degree of spatial freedom of movement, so as to facilitate good contact between the sealing structure 6 and the sealing port 9, thereby ensuring the sealing effect.

[0069] like Figure 1 As shown, a normal pressure chamber 13 is provided above the diaphragm 12, and a cover 15 is provided above the normal pressure chamber 13. The cover 15 is connected to the valve body 1 by fixing screws. The diaphragm 12 is sandwiched between the lower end surface of the cover 15 and the upper end surface of the valve body 1 at the connection. The valve body 1, the diaphragm 12 and the cover 15 are tightly sealed and fixed by the rubber sealing effect of the diaphragm 12 and the tightening effect of the fixing screws. A balanced breathing hole 14 with a filter device is provided on the cover 15 to communicate with the atmosphere outside the valve body. When the diaphragm 12 is moved by force to change the volume of the space in the normal pressure chamber 13, the air pressure in the normal pressure chamber 13 can be kept in dynamic balance with the ambient atmosphere through the balanced breathing hole 14.

[0070] At the same time, the normal pressure chamber 13 can also protect and prevent dust from the upper active area of ​​the diaphragm 12 through the cover 15 .

[0071] The valve body 1 is also provided with a negative pressure gas outlet 20, the diameter of which is matched with the general pipeline specifications of the gas pipeline project according to the rated gas design flux of the negative pressure gas outlet valve.

[0072] The negative pressure gas outlet 20 is provided with a gas outlet end connecting flange 21, which is used to connect with the negative pressure gas supply system to output the gas in the form of negative pressure.

[0073] It can be seen from the above that the negative pressure outlet chamber 10 and the normal pressure chamber 13 are separated by the diaphragm 12, one end of the valve stem 17 is fixedly connected to the diaphragm 12, and the other end is fixedly connected to the valve plate 5, and the valve plate 5 is arranged in the positive pressure inlet chamber 4.

[0074] When the negative pressure in the negative pressure outlet chamber 10 reaches a certain negative pressure value, the diaphragm 12 will be recessed into the negative pressure outlet chamber 10 under the action of the negative pressure and generate a valve opening force, which will drive the valve stem 17 to move downward, and further drive the valve plate 5 to move; after the valve plate 5 moves, the positive pressure inlet chamber 4 and the negative pressure outlet chamber 10 are connected, and the gas in the air source enters the positive pressure inlet chamber 4 through the positive pressure inlet port 3, and then further enters the negative pressure outlet chamber 10, and is transported to the gas-using device through the negative pressure outlet port 20.

[0075] When the gas-using device is always in use, there will be a continuous negative pressure in the negative pressure outlet chamber 10. According to the fluctuation of the negative pressure value, the valve plate 5 will open in time to dynamically form a passage between the positive pressure inlet chamber 4 and the negative pressure outlet chamber 10.

[0076] After the air-using device is closed, the negative pressure power source disappears. After a certain amount of gas is input from the positive pressure air inlet chamber 4 to the negative pressure air outlet chamber 10, the negative pressure in the negative pressure air outlet chamber 10 can no longer maintain the original negative pressure value, and the valve opening power of the diaphragm 12 which is concave downward can no longer be maintained. At this time, the valve plate 5 moves rapidly upward toward the valve closing position under the action of the first spring 7, thereby driving the valve stem 17 to move upward to reset, and further driving the diaphragm 12 to move upward to reset. When the valve plate 5 moves to a certain position in the valve closing direction, due to the reduction of the valve port flow rate, the valve plate 5 is affected by the first spring 7 while being affected by the gas pressure in the positive pressure air inlet chamber 4. Under this dual action, the valve plate 5 is completely closed and sealed, and the positive pressure air inlet chamber 4 and the negative pressure air outlet chamber 10 are separated by the valve plate 5, so as to achieve the purpose of cutting off the gas source and maintaining the negative pressure in the gas supply pipeline, thereby preventing the gas in the gas supply pipeline from leaking into the room.

[0077] like Figure 2 As shown, according to the process design requirements, the first spring 7 can also be arranged in the negative pressure outlet chamber 10, such as Figure 2In the direction shown, the lower end of the first spring 7 is fixed to the bottom of the inner wall of the negative pressure outlet chamber 10, and the elastic force of the first spring 7 is applied to the valve plate 5 through the connecting rod 23. The lower end of the connecting rod 23 and the valve plate 5 are connected by a universal ball to ensure the matching performance of the valve plate 5 when closed; a disc 22 is fixed to the upper end of the connecting rod 23, and the lower end surface of the disc 22 is in non-fixed contact with the upper end of the first spring 7.

[0078] like Figure 3 The figure shows an enlarged detail view of the position of the valve plate 5 in the normal valve closing state. The upper end of the outer diameter of the valve plate 5 is provided with a conical surface 24, and a groove is formed on the conical surface 24. A ring-shaped sealing rubber ring 26 is provided in the groove. A conical valve port 25 is provided above the conical surface 24, that is, at the periphery of the valve port 8. A certain gap a is left between the inner conical surface 24 and the outer conical surface 24. The conical valve port 25 is a protective valve port. Due to the existence of the gap a during normal operation, it does not play a role in sealing and isolating the passage of gas. However, when the valve plate 5 As the sealing structure 6 has been working for too long and is changing towards failure, the position of the valve plate 5 in the closed valve state will gradually move up compared to the normal state, and then the conical surface 24 will also gradually move up. When it moves up to a certain position, when the sealing structure 6 is about to fail, the conical surface 24 and the sealing rubber ring 26 on the valve plate 5 are acted upon by the first spring 7 and the gas pressure in the positive pressure intake chamber 4, and form a sealing effect with the conical valve port 25, thereby preventing the positive pressure gas from flowing uncontrolled to the negative pressure gas supply system due to the failure of the sealing structure 6. Since the diameter of the annular sealing rubber ring 26 is the sealing diameter of the conical valve port 25, which is much larger than the diameter of the sealing port 9, the corresponding effective pressure area of ​​the valve plate 5 under the effect of the gas pressure of the positive pressure intake chamber is also many times larger, so the valve closing force obtained by the valve plate 5 is also increased, resulting in the valve opening force of the valve stem 17 driven by the diaphragm 12 under the same working conditions being insufficient for the valve plate 5 to overcome the valve closing force and move in the valve opening direction, thus causing the valve port to fail to open normally and cut off the gas supply, so as to play a role in providing a warning of sealing failure in the form of failure to work normally on the basis of safety, thereby achieving the purpose of reminding the maintenance and replacement of the sealing structure 6 and ensuring the safe operation of the system. According to the fatigue resistance test of the selected sealing structure 6, the size of the gap a is adjusted in the design to ensure that the conical valve port 25 seal is enabled before the sealing performance of the sealing structure 6 fails, and the system operation is stopped and thus discovered.

[0079] Figure 4 The figure shows the open state of the negative pressure air outlet valve, which illustrates the feasibility of the spatial position of each component in the valve body, and further proves the practical feasibility of the present invention.

[0080] There are many ways to set the valve plate, which can be as follows Figure 1 , Figure 3 and Figure 4As shown, the valve plate is arranged in the positive pressure air intake chamber, and a first spring is arranged in the positive pressure air intake chamber. One end of the first spring abuts against the valve plate, and the other end abuts against the inner wall of the positive pressure air intake chamber. The first spring is used to drive the valve plate to perform a valve closing action.

[0081] The valve plate can also be arranged as follows Figure 2 As shown, the valve plate is arranged in the positive pressure air inlet chamber, and a connecting rod and a disc are arranged in the negative pressure air outlet chamber; one end of the connecting rod is connected to one side of the valve plate, and the other end of the connecting rod is fixedly connected to the disc; a first spring is sleeved on the connecting rod, one end of the first spring abuts against the side wall of the negative pressure air outlet chamber, and the other end abuts against the disc, and the first spring is used to drive the disc to move in the direction away from the positive pressure air inlet chamber; the first spring is used to drive the valve plate to perform a valve closing action.

[0082] Embodiment 2

[0083] like Figure 5 , Figure 6 and Figure 7 As shown, a negative pressure air outlet valve comprises a valve body, a valve plate, a valve stem, a connecting assembly and a diaphragm; a gas chamber is arranged in the valve body, the gas chamber comprises a positive pressure air inlet chamber, a negative pressure air outlet chamber and a normal pressure chamber, the positive pressure air inlet chamber and the negative pressure air outlet chamber are connected to each other by the movement of the valve plate to achieve the change of the connection state, and the negative pressure air outlet chamber and the normal pressure chamber are separated by a diaphragm; the positive pressure air inlet chamber is connected to the outside world through the positive pressure air inlet port, the negative pressure air outlet chamber is connected to the outside world through the negative pressure air outlet port, and the normal pressure chamber is connected to the outside world through the balanced breathing hole; one end of the valve stem is connected to the valve plate, and the other end of the valve stem is connected to the diaphragm through the connecting assembly, and the valve stem is used to drive the valve plate to move under the action of the diaphragm.

[0084] The negative pressure air outlet valve also includes a lever assembly, and the valve stem is connected to the connecting assembly via the lever assembly.

[0085] The lever assembly includes a first lever, a first bracket, a second lever, a second bracket and a movable lifting ring; one end of the first lever is rotatably connected to the connecting assembly, the other end of the first lever is rotatably connected to one end of the movable lifting ring, one end of the first bracket is fixedly arranged on the inner wall of the negative pressure air outlet chamber, and the other end of the first bracket is rotatably connected to the first lever; the other end of the movable lifting ring is rotatably connected to one end of the second lever, the other end of the second lever is rotatably connected to one end of the valve stem away from the valve plate, one end of the second bracket is fixedly arranged on the inner wall of the negative pressure air outlet chamber, and the other end of the second bracket is rotatably connected to the second lever.

[0086] The lever components are divided into at least two groups, and the lever components are evenly arranged with the valve stem as the axis.

[0087] Specifically, Figure 5 and Fig.15As shown, in the present embodiment, a negative pressure gas outlet valve is specifically used for a negative pressure gas outlet combination valve for a liquefied petroleum gas tank. The valve body 1 is used as a main structural component, carrying other related components and connecting them together. The air inlet end of the valve body 1 is connected to the liquefied gas tank, and the air outlet end is connected to the user's gas equipment. The gas in the liquefied gas tank enters the valve body through the positive pressure air inlet 3, and then enters the manual valve chamber 28 through the first connecting conduit 27 provided at the upper end of the positive pressure air inlet 3. The manual valve should be in a closed state when the gas equipment is temporarily not in use or when the liquefied gas tank is being filled and transported. At this time, the gas is controlled by the opening / closing of the manual valve, and the gas also flows / cuts off accordingly. If the manual valve is in the open state, the gas passes through the second connecting conduit 30 and enters the positive pressure air intake chamber 4. A first spring 7 and a valve plate 5 are provided in the positive pressure air intake chamber 4. The lower end of the first spring 7 is fixed to the bottom of the positive pressure air intake chamber 4, and the upper end is fixed to the valve plate 5. A sealing structure 6 is provided on the valve plate 5. A valve port 8 is provided at the upper end of the positive pressure air intake chamber 4. The valve port 8, the valve plate 5 and the first spring 7 are coaxially arranged. The lower end of the valve port 8, that is, the gas inlet end of the valve port 8, is provided with a raised sealing port 9 along the circumference of the port. The valve plate 5 is pressed on the lower end of the valve port 8 under the joint action of the first spring 7 and the positive pressure gas pressure, and the gas is cut off at the positive pressure air intake chamber 4 through the contact seal between the sealing structure 6 and the sealing port 9, and the valve plate 5 is in a closed valve state.The upper end of the valve port 8, i.e., the outlet end of the valve port 8, is provided with a negative pressure outlet chamber 10, and a second lever 32 is symmetrically provided in the negative pressure outlet chamber 10. The second lever 32 is fixed to the bottom of the negative pressure outlet chamber 10 through a fulcrum bracket. The end of the second lever 32 close to the symmetry axis, i.e., the end for applying the valve opening force, is a tuning fork-shaped splint type design, which is provided with an oblong hole, and is connected to a valve stem 17 through a connecting shaft. The valve stem 17 is coaxially arranged with the valve port 8. The second lever 32 is an equal force arm lever, and the fulcrum is in the middle of the force-bearing end and the force-applying end. The center position of the second lever 32 is as follows, but not limited to this, and mainly plays the role of changing the direction of the force application. The end of the second lever 32 away from the symmetry axis, that is, the end receiving the force of the valve opening force, is provided with a circular hole, and a movable ring 31 is connected to the circular hole. The second lever 32 is movably connected to the lower end of the movable ring 31, and the upper end of the movable ring 31 is connected to a symmetrically arranged first lever 33. The first lever 33 is fixed to the bottom of the negative pressure outlet chamber 10 through a fulcrum bracket. The end of the first lever 33 close to the symmetry axis, that is, the end receiving the force of the valve opening force The force-bearing end is a tuning fork-shaped splint type design, which is provided with an oblong hole, and is connected to a connecting assembly 16 through a connecting shaft. The connecting assembly 16 is coaxially arranged with the valve port 8. The first lever 33 is a labor-saving lever, and the fulcrum is close to the force-applying end. The distance between the force-bearing end and the fulcrum is 4 times the distance between the force-bearing end and the fulcrum, that is, 2cm:0.5cm. This design example is like this, but it is not limited to this. It mainly plays the role of increasing the torque. The connecting assembly 16 is tightly fixedly connected to the diaphragm 12. The diaphragm 12 is made of rubber. The main function of the diaphragm 12 is to It is used as a sealing isolation part between the negative pressure outlet chamber 10 and the normal pressure chamber 13. At the same time, when negative pressure is generated in the negative pressure outlet chamber 10, it is affected by the pressure difference between the atmospheric pressure in the normal pressure chamber 13 and the negative pressure in the negative pressure outlet chamber 10. When the pressure difference and the fixed area of ​​the diaphragm 12 are affected, and the force of the first lever 33 are added, the valve opening force is greater than the valve closing force on the valve plate 5, and the diaphragm 12 acts as a force receiving / force applying element to drive the valve stem 17 to move downward to realize the valve opening action. A normal pressure chamber 13 is provided above the diaphragm 12, and a cover 15 is provided above the normal pressure chamber 13. The cover 15 is connected to the valve body 1 through fixing screws. The diaphragm 12 is sandwiched between the lower end surface of the cover 15 at the connection and the upper end surface of the valve body 1. The valve body 1, the diaphragm 12, and the cover 15 are tightly sealed and fixed by the rubber sealing effect of the diaphragm 12 and the tightening effect of the fixing screws. The cover 15 is provided with a balanced breathing hole 14 with a filtering device connected to the atmosphere outside the valve body. When the diaphragm 12 is moved by force to change the volume of the space in the normal pressure chamber 13, the air pressure in the normal pressure chamber 13 can be kept in dynamic balance with the ambient atmosphere through the balanced breathing hole 14.

[0088] At the same time, the normal pressure chamber 13 also protects and prevents dust from the upper active area of ​​the diaphragm 12 through the cover 15 .

[0089] A negative pressure outlet port 20 is also provided on the valve body 1, which is connected to the negative pressure outlet chamber 10 through a third connecting conduit 34. The negative pressure outlet port 20 serves as an interface for connecting to the user's gas equipment end. Considering the commonality with traditional connectors, the interface design of the negative pressure outlet port 20 in this design example matches the outlet connector of a traditional liquefied gas tank, and the output end interface connection thread is left-handed, but not limited to this. It can also be changed to any other interface form according to needs, such as a quick-release interface, or / and, an interface form that can connect a flexible hose with a smaller diameter and is more durable.

[0090] The negative pressure outlet 20 is connected to the user's gas equipment. When the user activates the gas equipment, the negative pressure of the gas equipment acts on the negative pressure outlet chamber 10 through the negative pressure outlet 20 and then through the third connecting duct 34. The negative pressure at the negative pressure end of the equipment is -10KPa. At this time, a pressure difference of 10KPa is formed between the negative pressure outlet chamber 10 and the normal pressure chamber 13. This pressure difference acts on the upper surface of the diaphragm 12, and the pressure drives the diaphragm 12 and the connecting component 16 to move downward.

[0091] Fig.15 The diagram shows the valve plate 5 of the negative pressure outlet combination valve in the maximum valve opening state, that is, the valve plate 5 is opened to a height of 1.88 mm, the diaphragm 12 and the connecting assembly 16 are displaced 8 mm downward to the self-locking limit position by the lever arm and cannot move downward any further, and the relative matching positions of the parts in proportion. It can be seen from the figure that there is no contradiction or conflict in the spatial position design of the negative pressure outlet combination valve, which is reasonable and feasible.

[0092] More specifically, Figure 6 As shown, the valve body 1 is provided with a filling port 37, which is a filling and filling interface of the liquefied petroleum gas tank. The filling port 37 is provided with a sealing plug 36. When the liquefied petroleum gas tank is in normal use or the liquefied petroleum gas tank is in transportation, the filling port 37 is blocked and sealed by the sealing plug 36. Before the filling and filling operation, the sealing plug 36 is first removed, and the sealing plug 36 is installed and sealed after the filling and filling operation is completed to prevent the gas in the tank from leaking. The sealing plug 36 is provided with two radial and axial rubber sealing rings, which ensures good air tightness, is easy to disassemble and assemble, and is easy to replace the sealing rubber ring at any time. Inside the filling port 37, a one-way valve 35 is coaxially arranged, and its function is to prevent the liquefied petroleum gas in the tank from leaking out automatically when the sealing plug 36 is removed. Only when encountering a special push rod provided on the special filling gun muzzle matched with it, the one-way valve 35 can be opened under the action of the special push rod to facilitate filling and filling. The one-way valve 35 is connected to the positive pressure air inlet 3 through the first connecting conduit 27, and the added liquefied petroleum gas enters the liquefied gas tank in the reverse direction.

[0093] like Figure 7As shown, the valve body is provided with a filling port 37, which is a filling and filling interface for the liquefied petroleum gas tank. The filling port 37 is provided with a straight-through valve 38 of the same specification as the angle valve fixedly mounted on the traditional liquefied gas tank but in a different direction. It is then connected to the positive pressure air inlet 3 by the first connecting conduit 27, and the filled liquefied petroleum gas enters the liquefied gas tank in the reverse direction. When the liquefied gas tank is in normal use or during transportation, the straight-through valve 38 is in a closed state. It is only used for filling and filling the liquefied petroleum gas. In order to adapt to the traditional habits and traditional tools and tools that have been formed, it can be used as an alternative option or a temporary transitional option. It is not the preferred option, but it can indirectly enhance the practical feasibility of the overall negative pressure system.

[0094] Figure 8 The figure shows an enlarged view of the position of the valve plate 5. A conical surface 24 is provided at the upper end of the outer diameter of the valve plate 5. A groove is formed around the conical surface 24. A sealing rubber ring 26 is provided in the groove. A conical valve port 25 is provided above the conical surface 24, i.e., at the periphery of the valve port 8. A certain gap a is left between the inner conical surface of the conical valve port 25 and the conical surface 24 of the valve plate 5. The conical valve port 25 is a protective valve port. During normal operation, due to the existence of the gap a, it does not play a role in sealing and isolating the passage of gas. However, when the sealing ring on the valve plate 5 Since the sealing structure 6 has been working for too long, as the failure trend changes, the position of the valve plate 5 in the closed valve state will gradually move up compared to the normal state, and then the conical surface 24 will gradually move up. When it moves up to a certain position, when the sealing structure 6 is about to fail, the conical surface 24 on the valve plate 5 and the sealing rubber ring 26 are acted upon by the first spring 7 and the positive pressure air intake chamber 4 to form a sealing effect with the conical valve port 25, thereby preventing the positive pressure gas from flowing uncontrolled to the negative pressure air supply system due to the failure of the sealing structure 6. Since the diameter of the annular sealing rubber ring 26 is the sealing diameter of the conical valve port 25, which is much larger than the diameter of the sealing port 9, the corresponding effective pressure area of ​​the valve plate 5 under the effect of the gas pressure of the positive pressure intake chamber is also many times larger, so the valve closing force obtained by the valve plate 5 is also increased, resulting in the valve opening force of the valve stem 17 driven by the diaphragm 12 under the same working conditions being insufficient for the valve plate 5 to overcome the valve closing force and move in the valve opening direction, thus causing the valve port to fail to open normally and cut off the gas supply, so as to play a role in providing a warning of sealing failure in the form of failure to work normally on the basis of safety, thereby achieving the purpose of reminding the maintenance and replacement of the sealing structure 6 and ensuring the safe operation of the system. According to the fatigue resistance test of the selected sealing structure 6, the size of the gap a is adjusted in the design to ensure that the conical valve port 25 seal is enabled before the sealing performance of the sealing structure 6 fails, and the system operation is stopped and thus discovered.

[0095] A conical structure is also provided on one side of the valve plate close to the valve stem, and a second valve port is also provided in the positive pressure air inlet chamber, and the second valve port is conical;

[0096] The outer side surface of the conical structure is matched with the inner side surface of the conical valve port. A sealing ring is arranged on the outer side surface of the conical structure around the axis of the conical structure. After the sealing structure 6 fails, the sealing ring and the conical structure seal between the valve plate and the conical valve port.

[0097] Fig. 9 , Fig.10 and Fig.11 As shown, it is an enlarged view of the manual valve chamber 28 where the manual valve is located, wherein Fig. 9 This is a valve opening state diagram when the gas in the liquefied gas tank is in a normal working state with saturated vapor pressure; Fig.10 This is a closed valve state diagram when the gas in the liquefied gas tank is in an abnormal working state with non-saturated vapor pressure; Fig.11 This is the valve closed state diagram when the valve is closed manually.

[0098] like Fig. 9 , Fig.10 and Fig.11As shown, the front end of the manual valve, i.e., the end close to the first communication conduit 27, is provided with a valve core 39. The valve core 39 is provided with two sets of sealing mechanisms. The first set of sealing structures is provided at the front end of the valve core 39, i.e., the end close to the first communication conduit 27. It is composed of a first truncated cone and a first cylinder in sequence. The first truncated cone can play a guiding role in the process of the valve core 39 changing from the open valve state to the closed valve state, so that the first cylinder can smoothly enter the first communication conduit 27 and form a plunger sealing structure therewith. A sliding fit with a certain gap is formed between the outer diameter of the first cylinder and the inner diameter of the first communication conduit 27. This relatively narrow fit gap can play a certain closing sealing role or greatly limit the gas flux. A second set of sealing structures formed by a second truncated cone is coaxially provided behind the first set of sealing structures formed by the first cylinder and the first communication conduit 27. This sealing structure is conical and can form a contact seal with the corresponding conical sealing edge provided behind the coaxially arranged first communication conduit 27 to play a valve closing role. A second cylinder with an outer diameter consistent with the large diameter end of the conical sealing structure is coaxially arranged behind the conical sealing structure. Its function is to utilize the annular gap b formed between the outer diameter of the cylinder and the inner diameter of the hand valve chamber 28 to achieve flow balancing and flow limiting, so as to ensure that the valve core 39 can evenly and fully obtain the force to maintain the valve open formed by the impact of the gas flow from the first connecting conduit 27. It should be noted that the so-called flow limiting does not mean that the flow rate is not lower than the required design flow rate. The valve core 39 is also provided with a hand valve conduit 40, which is arranged behind the cylinder behind the conical sealing structure. The outer diameter of the hand valve conduit is smaller than the outer diameter of the cylinder behind the conical sealing structure. A certain sliding fit clearance is formed between the inner diameter of the hand valve conduit 40 and the outer diameter of the hand valve push rod 41, and a certain sliding fit clearance is formed between the outer diameter of the hand valve conduit 40 and the inner diameter of the base 42, so as to guide the movement of the valve core 39 when opening / closing the valve. The cylindrical sealing structure, the conical sealing structure, the cylinder behind the conical sealing structure and the hand valve conduit 40 are all part of the valve core 39 body and move with the valve core 39. A sleeve is also provided on the outer diameter surface of the hand valve conduit 40. There is a spring, one end of which is pressed on the rear end face of the cylinder behind the conical sealing structure of the valve core 39, and the other end is pressed on the end face of the base 42 facing the valve core 39. Its function is to provide a certain valve closing force for the valve core 39 when the hand valve push rod 41 is in the swing state of manual valve opening; behind the hand valve guide tube 40, or / and inside the hand valve guide tube 40, a hand valve push rod 41 is provided, which is manually controlled by the hand valve wheel 29, and is rotated out to push the valve core 39 to the valve closing position, or rotated to release the valve core 39, so as to cooperate with the valve core 39 to play the role of manual valve closing and opening, and also has the function of guiding the movement of the valve core 39; behind the hand valve guide tube 40, or / and outside the hand valve guide tube 40, a base 42 is provided, whose function is to provide movement guidance for the valve core 39, and at the same time serves as a force support for one end of the second spring 43.

[0099] The specific process of the above-mentioned devices cooperating with each other is as follows: Fig. 9 As shown in FIG. 2 , when the gas in the liquefied gas tank is in a saturated vapor pressure state and the pressure is large enough, the gas pressure in the tank acts on the valve core 39 through the connecting hand valve conduit 40. When the negative pressure outlet valve works normally, the valve core 39 can open normally, remain open or close accordingly; (ii) Fig.10 As shown, when the gas in the liquefied gas tank is nearly exhausted and no more gas in liquid state exists, the gas is in an unsaturated vapor pressure state. In this state, under the condition that the ambient temperature remains unchanged, as the gas equipment continuously extracts and uses the gas in the tank, the gas pressure in the tank will no longer remain constant at a certain temperature, but will gradually decrease at a faster speed. When it decreases to a certain extent, although the hand valve push rod 41 is still in the manual open state of the swing position, the gas pressure in the unsaturated vapor state is not enough to support a certain flow rate to overcome the valve closing force formed by the second spring 43 on the valve core 39, causing the valve core 39 to move in the valve closing direction. When it moves to a certain extent, especially when the first set of sealing structures formed by the first cylinder at the front end and the first connecting conduit 27 begin to play a sealing role, The flow rate of the fuel gas flowing out through the first connecting conduit 27 drops sharply, causing the gas flow to weaken sharply. At this time, in the hand valve chamber 28, the pressure difference between the front and back spaces of the valve core 39, which was originally maintained by the existence of the gap b, also decreases sharply. In this state, the valve core 39 closes quickly under the action of the second spring 43, and the second set of sealing structures formed between the second frustum and the corresponding conical sealing edge provided behind the first connecting conduit 27 play a sealing role. At this time, as a negative pressure power source, even if the gas pressure in the gas supply pipeline is further reduced, the valve core 39 will no longer open normally. At the same time, it is also in a low-pressure shutdown alarm prompt state, prompting the user to replace the liquefied gas tank for use, so as to avoid the risk of ambient air backflowing into the liquefied gas tank due to excessive extraction of the gas in the liquefied gas tank; (iii) Fig.11 As shown, the manual valve push rod 41 is in the manually closed state in the screwed-out position, and the valve core 39 is subjected to the valve closing force applied by the hand valve push rod 41, and a contact seal is formed between the second frustum and the conical sealing edge behind the first connecting conduit 27 to play a valve closing role.

[0100] Fig.12 , Fig.13 and Fig.14They are respectively the front view, top view and side view of the parts of the valve stem 17. As shown in the front view, top view and side view, the valve stem 17 is provided with guide wings 44. As shown in the top view, the guide wings 44 are evenly and symmetrically arranged along the circumference of the outer diameter of the valve stem 17. The number of the guide wings 44 can be three or more, but should not be less than three. The function is that the valve stem 17 moves axially up and down in the valve port 8 to achieve valve opening and closing / valve action. The gap between the guide wings 44 and the valve port 8 plays a stabilizing role. At the same time, the wing ends form a uniformly distributed gap with sufficient flux between the valve stem 17 and the inner diameter of the valve port 8, and the gas can pass through this gap when the valve is open.

[0101] The present invention also provides an indoor gas supply system, which comprises the negative pressure gas outlet valve described in any one of the above items.

[0102] The beneficial effects of the embodiments of the present invention are:

[0103] The negative pressure air outlet valve is connected to the pipeline of the air supply system. When the negative pressure air outlet chamber 10 in the negative pressure air outlet valve is under negative pressure, the diaphragm 12 drives the valve stem 17 to move, and then the valve stem 17 drives the valve plate 5 to move to open the valve plate 5, so that the positive pressure air inlet chamber 4 and the negative pressure air outlet chamber 10 are connected to achieve normal air supply; when the negative pressure air outlet chamber 10 is under positive pressure or normal pressure or the negative pressure is insufficient, the diaphragm 12 has insufficient valve opening force, and the valve plate 5 connects the positive pressure air inlet chamber 4 to the negative pressure air outlet chamber 10, and air cannot be supplied.

[0104] The arrangement of the present invention ensures that only when the gas supply system is under negative pressure and the negative pressure outlet valve is opened, the gas supply system can be connected with the indoor gas-using equipment through the negative pressure outlet valve of the present invention to supply gas to the gas-using equipment. When the gas supply system is under positive pressure, the negative pressure outlet valve is closed and the gas supply system cannot be connected with the indoor gas-using equipment, thereby avoiding gas leakage into the room and ensuring safety of use.

Claims

1. A negative pressure air outlet valve, It is characterized in that It comprises a valve body, a valve plate, a valve stem, a connecting assembly and a diaphragm; a gas chamber is arranged in the valve body, and the gas chamber comprises a positive pressure air inlet chamber, a negative pressure air outlet chamber and a normal pressure chamber; the positive pressure air inlet chamber and the negative pressure air outlet chamber are connected to each other by the movement of the valve plate, and the negative pressure air outlet chamber is separated from the normal pressure chamber by the diaphragm; The positive pressure air inlet chamber is connected to the outside world through the positive pressure air inlet, the negative pressure air outlet chamber is connected to the outside world through the negative pressure air outlet, and the normal pressure chamber is connected to the outside world through the balanced breathing hole; One end of the valve stem is connected to the valve plate, and the other end of the valve stem is connected to the diaphragm through the connecting assembly. The valve stem is used to drive the valve plate to move under the action of the diaphragm; The positive pressure air inlet chamber is connected to the negative pressure air outlet chamber through a first valve port, and a sealing structure is provided on a side of the valve plate close to the first valve port to ensure isolation between the positive pressure air inlet chamber and the negative pressure air outlet chamber after the valve plate is closed; A conical structure is also provided on one side of the valve plate close to the valve stem, and a second valve port is also provided in the positive pressure air inlet chamber, and the second valve port is conical; The outer side surface of the conical structure is matched with the inner side surface of the conical second valve port, and a sealing rubber ring is arranged on the outer side surface of the conical structure around the axis of the conical structure. The sealing rubber ring and the conical structure seal between the valve plate and the second valve port after the sealing structure fails; The gas inlet end of the first valve port or the second valve port is provided with a raised sealing port along the circumference of the port, and the diameter of the annular sealing rubber ring is larger than the diameter of the sealing port.

2. The negative pressure outlet valve according to claim 1, It is characterized in that It also includes a lever assembly, and the valve stem is connected to the connecting assembly through the lever assembly.

3. The negative pressure outlet valve according to claim 2, It is characterized in that The lever assembly comprises a first lever, a first bracket, a second lever, a second bracket and a movable lifting ring; One end of the first lever is rotatably connected to the connecting assembly, the other end of the first lever is rotatably connected to one end of the movable hanging ring, one end of the first bracket is fixedly arranged on the inner wall of the negative pressure outlet chamber, and the other end of the first bracket is rotatably connected to the first lever; The other end of the movable lifting ring is rotatably connected to one end of the second lever, the other end of the second lever is rotatably connected to one end of the valve stem away from the valve plate, one end of the second bracket is fixedly arranged on the inner wall of the negative pressure outlet chamber, and the other end of the second bracket is rotatably connected to the second lever.

4. The negative pressure outlet valve according to claim 3, It is characterized in that The lever assemblies are divided into at least two groups, and the lever assemblies are evenly arranged with the valve stem as the axis.

5. The negative pressure outlet valve according to claim 1, It is characterized in that A hand valve chamber is provided between the positive pressure air inlet and the positive pressure air inlet chamber, the hand valve chamber is connected with the positive pressure air inlet through a first connecting conduit, and the hand valve chamber is connected with the positive pressure air inlet chamber through a second connecting conduit; a truncated cone-shaped sealing valve port is provided at one end of the first connecting conduit close to the hand valve chamber; One end of the manual valve is slidably arranged in the manual valve chamber, and is used to manually realize the on-off of the air intake, and when the gas is in an unsaturated state, the booster gas equipment and the booster device can be in a low-pressure shutdown alarm prompt state in a flow limiting manner.

6. The negative pressure outlet valve according to claim 5, It is characterized in that The manual valve comprises a valve core, a manual valve guide tube, a manual valve push rod, a second spring and a manual valve wheel; The valve core includes a first truncated cone and a first cylinder, the first truncated cone and the first cylinder are coaxially arranged, and the large bottom surface of the first truncated cone is connected to the first cylinder.

7. The negative pressure outlet valve according to claim 6, It is characterized in that The valve core also includes a second truncated cone and a second cylinder, the first truncated cone, the first cylinder, the second truncated cone and the second cylinder are all coaxially arranged, the small bottom surface of the second truncated cone is connected to the end of the first cylinder away from the first truncated cone, and the second cylinder is connected to the large bottom surface of the second truncated cone; the second truncated cone and the truncated cone-shaped sealing valve port can form a contact seal; one end of the hand valve conduit is closed, the closed end is in contact with the second cylinder, and the diameter of the hand valve conduit is smaller than the diameter of the second cylinder; One end of the hand valve push rod is slidably disposed in the hand valve guide tube, and the other end is fixedly connected to the hand valve wheel, and the hand valve push rod is threadedly disposed on the valve body; The second spring is sleeved on the outside of the hand valve conduit, one end of the second spring abuts against one end of the cylinder, and the other end abuts against the inner wall of the hand valve chamber; The hand valve conduit is connected to one end of the second cylinder away from the second truncated cone.

8. The negative pressure outlet valve according to claim 1, It is characterized in that The valve plate is arranged in the positive pressure air intake chamber, and a first spring is arranged in the positive pressure air intake chamber. One end of the first spring abuts against the valve plate, and the other end abuts against the inner wall of the positive pressure air intake chamber. The first spring is used to drive the valve plate to perform a valve closing action.

9. The negative pressure outlet valve according to claim 1, It is characterized in that The valve plate is arranged in the positive pressure air inlet chamber, and a connecting rod and a disc are arranged in the negative pressure air outlet chamber; One end of the connecting rod is connected to one side of the valve plate, and the other end of the connecting rod is fixedly connected to the disc; A first spring is sleeved on the connecting rod, one end of the first spring abuts against the side wall of the negative pressure air outlet chamber, and the other end abuts against the disc, and the first spring is used to drive the disc to move away from the positive pressure air inlet chamber; the first spring is used to drive the valve plate to perform a valve closing action.

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