A new integrated multifunctional pressure reducing valve

Abstract

The present invention discloses a novel integrated multifunctional pressure reducing valve, which relates to the technical field of hydrogen supply system for fuel cell vehicles, including a valve body and a pressure reducing valve, a manual stop valve, a safety pressure relief valve, and a pressure sensor integrated on the valve body. A main road channel is arranged in the valve body, and a pressure reducing valve inlet and a pressure reducing valve outlet are arranged on the outer wall of the valve body, and the pressure reducing valve outlet is connected with the main road channel; the pressure reducing valve is used to adjust the pressure of the airflow flowing to the main road channel; the manual stop valve is used to control the interruption of the airflow in the main road channel; the safety pressure relief valve is used to control the discharge of the airflow in the main road channel; and the pressure sensor is used to monitor the airflow pressure value in the main road channel in real time. The novel integrated multifunctional pressure reducing valve of the present invention can be used for 70MPa fuel cell vehicles, which solves the problem of too many valves and connectors caused by the separate setting of each pipe valve component, reduces the risk of leakage, has low cost, light weight, good shock resistance, and can be replaced as a whole during maintenance, reducing the difficulty of inspection and maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen supply systems for fuel cell vehicles, and in particular to a pressure reducing valve. Background Art

[0002] The hydrogen supply system of fuel cell vehicles is composed of a storage tank for storing high-pressure hydrogen, an integrated hydrogen bottle valve on the storage tank, a pressure reducing valve and other related pipe and valve parts. Among them, the function of the pressure reducing valve is to convert high-pressure hydrogen into low-pressure hydrogen that can be used by fuel cells. Therefore, the pressure reducing valve is the most core and indispensable part of the hydrogen supply system. Considering the long endurance, light weight, low cost and minimization of leakage points of fuel cell vehicles, the higher the integration of the pressure reducing valve, the fewer the number of pipe and valve parts in the hydrogen supply system. Highly integrated pressure reducing valves are also conducive to mass production of vehicles.

[0003] In the hydrogen supply system, a pressure sensor must be installed at the rear end of the pressure reducing valve to monitor the pressure at the pressure reducing valve outlet (i.e., the pressure entering the fuel cell stack) in real time. A safety pressure relief valve must also be installed to prevent the loss of life and property caused by the failure of the pressure reducing valve. However, the existing pressure reducing valves, pressure sensors, safety pressure relief valves, etc. are all independent products, and only a few of them can be applied to the high-pressure hydrogen working conditions of fuel cell vehicles. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a new integrated multifunctional pressure reducing valve, which solves the technical problems that the pressure reducing valve and pipe valve components have low integration and are not suitable for high-pressure hydrogen working conditions.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A novel integrated multifunctional pressure reducing valve comprises a valve body, wherein a main passage is arranged in the valve body, and a pressure reducing valve inlet and a pressure reducing valve outlet are provided on the outer wall of the valve body, and the pressure reducing valve outlet is communicated with the main passage; a pressure reducing valve, wherein the pressure reducing valve is arranged in the valve body at one side close to the pressure reducing valve inlet, the pressure reducing valve is located between the pressure reducing valve inlet and the main passage, and the pressure reducing valve is used to adjust the air flow pressure flowing to the main passage; a manual stop valve, wherein the manual stop valve is arranged in the valve body, the manual stop valve is located at one side of the pressure reducing valve, the manual stop valve is communicated with the main passage, and the manual stop valve is used to control the air flow cut-off in the main passage; a safety pressure relief valve, wherein the safety pressure relief valve is arranged in the valve body, the safety pressure relief valve is located at the other side of the manual stop valve relative to the pressure reducing valve, the safety pressure relief valve is communicated with the main passage, and the safety pressure relief valve is used to control the air flow discharge in the main passage; and a pressure sensor, wherein the pressure sensor is arranged in the valve body at one side close to the pressure reducing valve outlet, and the pressure sensor is used to monitor the air flow pressure value in the main passage in real time.

[0007] Preferably, the valve body is made of aluminum alloy.

[0008] The novel integrated multifunctional pressure reducing valve mentioned above, wherein the pressure reducing valve comprises:

[0009] A valve cover 1, wherein the valve cover 1 is threadedly connected to the valve body, the valve cover 1 and the valve body form a cavity 1, a cavity 2 is opened on the valve body at the bottom of the cavity 1, and the cavity 2 is connected to the main channel;

[0010] A pressure regulating mechanism, the pressure regulating mechanism is arranged in the cavity 1, the pressure regulating structure comprises an upper spring seat, a pressure regulating spring and a lower spring seat, and two ends of the pressure regulating spring are respectively connected to the upper spring seat and the lower spring seat;

[0011] A pressure-stabilizing mechanism, the pressure-stabilizing mechanism is arranged in the cavity two, the pressure-stabilizing mechanism includes a valve seat, a valve stem one and a pressure-stabilizing spring, the valve seat is fixed to the upper part of the cavity two, a valve plate is provided at the bottom of the valve seat, the upper end of the valve stem one passes through the valve seat and abuts against the lower surface of the lower spring seat, and the pressure-stabilizing spring is sleeved on the valve stem one.

[0012] In the novel integrated multifunctional pressure reducing valve, an adjusting screw is arranged on the valve cover, and the lower end of the adjusting screw abuts against the upper surface of the upper spring seat.

[0013] The novel integrated multifunctional pressure reducing valve mentioned above, wherein the valve body is provided with a pressure reducing valve breathing port, and the pressure reducing valve breathing port is in communication with the cavity.

[0014] The above-mentioned novel integrated multifunctional pressure reducing valve, wherein the pressure reducing valve inlet is connected to the bottom of the cavity one through channel four.

[0015] The above-mentioned new integrated multifunctional pressure reducing valve, wherein the main channel includes channel one, channel two and channel three which are connected in sequence, the channel one and the channel three are respectively located on both sides of the channel two, the channel one and the channel three are both perpendicular to the channel two, the manual stop valve is connected to the channel two, the central axis of the manual stop valve coincides with the central axis of the channel two, and the safety pressure relief valve and the pressure sensor are both connected to the channel three.

[0016] The above-mentioned new integrated multifunctional pressure reducing valve, wherein the manual stop valve comprises a valve cover 2 and a valve stem 2 threadedly connected to the valve cover 2, the valve cover 2 is threadedly connected to the valve body, and a sealing member is provided at the bottom of the valve stem 2.

[0017] The novel integrated multifunctional pressure reducing valve mentioned above, wherein the safety pressure relief valve comprises:

[0018] A sealing shell, wherein the sealing shell is threadedly connected to the valve body, and the sealing shell is a hollow structure with openings at both ends;

[0019] A pressure relief valve body, wherein the pressure relief valve body is threadedly connected to the sealing housing, the pressure relief valve body is a hollow structure with two ends open, and an annular step is provided on the upper side of the inner part of the pressure relief valve body;

[0020] A valve core, the valve core is arranged in the pressure relief valve body, a sealing cap is arranged at the upper end of the valve core, the lower surface of the sealing cap is in contact with the upper surface of the annular step, and a base is fixed at the lower end of the valve core;

[0021] A return spring is sleeved on the valve core, and two ends of the return spring are respectively connected to the annular step and the base.

[0022] The above-mentioned novel integrated multifunctional pressure reducing valve, wherein a pressure relief interface is provided at the upper end of the sealing shell.

[0023] Due to the adoption of the above technology, the present invention has the following positive effects compared with the prior art:

[0024] 1. The new integrated multifunctional pressure reducing valve of the present invention can be used for 70MPa fuel cell vehicles. The pressure reducing valve, manual stop valve, safety pressure relief valve and pressure sensor are all integrated in the valve body, which solves the problem of too many valves and connection ports caused by the separate setting of each pipe valve component and reduces the risk of leakage.

[0025] 2. The novel integrated multifunctional pressure reducing valve of the present invention has low cost, light weight and good shock resistance.

[0026] 3. The novel integrated multifunctional pressure reducing valve of the present invention makes the manufacturability of fuel cell vehicles stronger, and the integrated multifunctional pressure reducing valve is installed in the hydrogen supply system of the fuel cell vehicle, which is convenient for installation.

[0027] 4. The novel integrated multifunctional pressure reducing valve of the present invention can be replaced as a whole during maintenance, thereby reducing the difficulty of inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional view of the novel integrated multifunctional pressure reducing valve of the present invention;

[0029] Figure 2 It is a cross-sectional view of the pressure reducing valve of the novel integrated multifunctional pressure reducing valve of the present invention;

[0030] Figure 3 It is a cross-sectional view of the safety pressure relief valve of the novel integrated multifunctional pressure reducing valve of the present invention.

[0031] In the attached figure: 1, valve body; 11, main channel; 111, channel 1; 112, channel 2; 113, channel 3; 12, pressure reducing valve inlet; 13, pressure reducing valve outlet; 14, pressure reducing valve breathing port; 15, channel 4; 2, pressure reducing valve; 21, valve cover 1; 211, adjusting screw; 212, cover nut; 221, upper spring seat; 222, pressure regulating spring; 223, lower spring seat; 231, valve seat; 232, valve stem 1; 2321, sealing cone head; 233 , pressure-stabilizing spring; 234, valve plate; 241, O-ring one; 242, small washer; 243, O-ring two; 244, large washer; 3, manual stop valve; 31, valve cover two; 32, valve stem two; 33, seal; 34, hexagonal nut; 4, safety pressure relief valve; 41, pressure relief valve body; 411, annular step; 42, valve core; 43, sealing cap; 44, base; 45, reset spring; 46, sealing housing; 461, pressure relief interface; 5, pressure sensor. DETAILED DESCRIPTION

[0032] The purpose of the present invention is to provide a new integrated multifunctional pressure reducing valve, which integrates a pressure reducing valve, a manual stop valve, a safety pressure relief valve and a pressure sensor into the same valve body and can be suitable for 70MPa fuel cell vehicles.

[0033] The following will be combined with the drawings and specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Figure 1 is a cross-sectional view of the novel integrated multifunctional pressure reducing valve of the present invention, Figure 2 is a cross-sectional view of the pressure reducing valve of the novel integrated multifunctional pressure reducing valve of the present invention, Figure 3 This is a cross-sectional view of the safety pressure relief valve of the new integrated multifunctional pressure reducing valve of the present invention. Figure 1 , Figure 2 and Figure 3 As shown, a novel integrated multifunctional pressure reducing valve of a preferred embodiment is shown, comprising: a valve body 1, a main path channel 11 is arranged in the valve body 1, a pressure reducing valve inlet 12 and a pressure reducing valve outlet 13 are opened on the outer wall of the valve body 1, the pressure reducing valve inlet 12 is used for inputting airflow, the pressure reducing valve outlet 13 is connected to one end of the main path channel 11, and the pressure reducing valve outlet 13 is used for outputting airflow.

[0035] In addition, as a preferred embodiment, the new integrated multifunctional pressure reducing valve also includes: a pressure reducing valve 2, which is arranged on a side of the valve body 1 close to the pressure reducing valve inlet 12, and the pressure reducing valve 2 is located between the pressure reducing valve inlet 12 and the main channel 11. The pressure reducing valve inlet 12 is connected to the other end of the main channel 11 through the pressure reducing valve 2. The pressure reducing valve 2 is used to adjust the airflow pressure flowing from the pressure reducing valve inlet 12 to the main channel 11, and can reduce the pressure of the high-pressure airflow at the pressure reducing valve inlet 12 and transport it to the main channel 11.

[0036] Furthermore, as a preferred embodiment, the new integrated multifunctional pressure reducing valve also includes: a manual stop valve 3, which is arranged in the valve body 1, and the manual stop valve 3 is located on one side of the pressure reducing valve 2. The manual stop valve 3 is connected to the main channel 11, and the manual stop valve 3 is used to control the air flow interruption in the main channel 11. When emergency shutdown is required, the manual stop valve 3 is used to cut off the main channel 11.

[0037] Furthermore, as a preferred embodiment, the new integrated multifunctional pressure reducing valve also includes: a safety pressure relief valve 4, which is arranged in the valve body 1, and the safety pressure relief valve 4 is located on the other side of the manual stop valve 3 relative to the pressure reducing valve 2, and the safety pressure relief valve 4 is connected to the main channel 11. The safety pressure relief valve 4 is used to control the discharge of the airflow in the main channel 11. When the pressure reducing valve 2 fails and the pressure reduction fails, the safety pressure relief valve 4 is used to discharge the airflow in the main channel 11 to the outside to avoid accidents.

[0038] Furthermore, as a preferred embodiment, the new integrated multifunctional pressure reducing valve also includes: a pressure sensor 5, which is arranged on a side of the valve body 1 close to the pressure reducing valve outlet 13, and the pressure sensor 5 is used to monitor the airflow pressure value in the main channel 11 in real time.

[0039] In addition, as a preferred embodiment, the valve body 1 is made of aluminum alloy, which has good machinability and light weight. The pressure reducing valve 2, manual stop valve 3, safety pressure relief valve 4 and pressure sensor 5 are all integrated on the same valve body 1, which can reduce the risk of leakage caused by too many connection ports.

[0040] In addition, as a preferred embodiment, the main channel 11 includes channel one 111, channel two 112 and channel three 113 which are connected in sequence, channel one 111 and channel three 113 are respectively located on both sides of channel two 112, channel one 111 and channel three 113 are both perpendicular to channel two 112, the manual stop valve 3 is connected to channel two 112, the safety pressure relief valve 4 and the pressure sensor 5 are both connected to channel three 113, the central axis of the manual stop valve 3 coincides with the central axis of channel two 112, and the manual stop valve 3 can be controlled to move downward to seal channel two 112.

[0041] It should be pointed out that the directional words "upper" and "lower" mentioned in this article are defined based on the relative positions of the components in the drawings of the present invention. This is only for the clarity and convenience of describing the technical solution. It should be understood that the use of these directional words does not constitute a limitation on the scope of protection of this application.

[0042] The various components of the present invention are described in detail below:

[0043] Pressure reducing valve 2:

[0044] Also, as a preferred embodiment, please continue to refer to Figure 1 and Figure 2 As shown, the pressure reducing valve 2 includes: a valve cover 21, the valve cover 21 is threadedly connected to the valve body 1, a cavity 1 is formed between the valve cover 21 and the valve body 1, a cavity 2 is opened on the valve body 1 at the bottom of the cavity 1, and the cavity 2 is connected to the channel 111 of the main channel 11.

[0045] Further, as a preferred embodiment, the pressure reducing valve 2 also includes: a pressure regulating mechanism, which is arranged in the cavity 1, and the pressure regulating structure includes an upper spring seat 221, a pressure regulating spring 222 and a lower spring seat 223, and the two ends of the pressure regulating spring 222 are respectively connected to the upper spring seat 221 and the lower spring seat 223, and a seal is formed between the lower spring seat 223 and the valve body 1 through an O-ring 241.

[0046] Furthermore, as a preferred embodiment, the pressure reducing valve 2 further includes: a pressure stabilizing mechanism, which is arranged in the second cavity, and includes a valve seat 231, a valve stem 232 and a pressure stabilizing spring 233. The valve seat 231 is fixed to the upper part of the second cavity, and a valve plate 234 is provided at the bottom of the valve seat 231. The upper end of the valve stem 232 passes through the valve seat 231 and abuts against the lower surface of the lower spring seat 223. The middle part of the valve stem 232 is provided with a sealing cone head 2321. The sealing cone head 2321 cooperates with the valve seat 231 to control the flow rate of the airflow. When the sealing cone head 2321 fits with the valve plate 234, the sealing cone head 2321 and the valve seat 231 form a seal. The pressure-stabilizing spring 233 is sleeved on the valve stem 232. The upper end of the pressure-stabilizing spring 233 abuts on the sealing cone head 2321, and the lower end of the pressure-stabilizing spring 233 abuts on the valve seat 231. A large gasket 244 is arranged between the pressure-stabilizing spring 233 and the valve seat 231.

[0047] Furthermore, as a preferred embodiment, an adjusting screw 211 is provided on the valve cover 21, and the adjusting screw 211 passes through the valve cover 21 in the vertical direction. The lower end of the adjusting screw 211 abuts against the upper surface of the upper spring seat 221, and a cover nut 212 is provided on the upper end of the adjusting screw 211. The user can drive the adjusting screw 211 to press down the upper spring seat 221, the pressure regulating spring 222 and the lower spring seat 223 by rotating the cover nut 212 clockwise. The required pressure value of the high-pressure airflow after decompression is set by the compression amount of the pressure regulating spring 222. The lower spring seat 223 simultaneously drives the valve stem 232 to move downward, and the sealing cone head 2321 on the valve stem 232 compresses the pressure stabilizing spring 233, and the sealing cone head 2321 is separated from the valve seat 231, thereby opening the pressure reducing valve 2.

[0048] Furthermore, as a preferred embodiment, a pressure reducing valve breathing port 14 is provided on the valve body 1, and the pressure reducing valve breathing port 14 is connected with the cavity one, and the pressure reducing valve inlet 12 is connected with the bottom of the cavity one through channel four 15. The airflow at the pressure reducing valve inlet 12 enters the cavity one through channel four 15, and the airflow first passes through the pressure regulating mechanism and then flows to the pressure stabilizing mechanism, thereby realizing precise regulation of the airflow pressure.

[0049] Moreover, as a preferred embodiment, an O-ring 1 is sleeved on the lower spring seat 223, and the lower spring seat 223 forms a seal with the valve body 1 through the O-ring 1. A small gasket 242 and an O-ring 243 are sleeved on the outer wall of the lower end of the valve stem 1 232. The small gasket 242 and the O-ring 243 are both located below the channel 1 111, and the valve stem is sealed with the valve body 1 through the small gasket 242 and the O-ring 243.

[0050] Working principle of pressure reducing valve 2: the pressure reducing valve inlet 12 is connected to the hydrogen storage cylinder. After the hydrogen storage cylinder is opened, the airflow passes through the pressure reducing valve inlet 12 and channel four 15 in sequence and enters the cavity one at the bottom of the lower spring seat 223. The pressure of the airflow is reduced by the obstruction of the valve seat 231. The attenuated airflow flows downward and enters the channel one 111 through the cavity two. When the airflow pressure input to the pressure reducing valve inlet 12 increases, the airflow pushes the lower spring seat 223 to move upward, and the valve stem one 232 moves upward under the tension of the pressure stabilizing spring 233. The opening degree of the valve seat 231 decreases, and the flow resistance of the airflow increases, so that the airflow pressure decreases. When the airflow pressure input to the pressure reducing valve inlet 12 decreases, the lower spring seat 223 moves downward under the tension of the pressure regulating spring 222, and presses the valve stem one 232 to move downward synchronously. The opening degree of the valve seat 231 increases, and the flow resistance of the airflow decreases, so that the airflow pressure increases, thereby achieving the purpose of stabilizing the airflow pressure.

[0051] Manual stop valve 3:

[0052] In addition, as a preferred embodiment, please continue to refer to Figure 1 As shown, the manual stop valve 3 includes: a valve cover 31 , and the valve cover 31 is threadedly connected to the valve body 1 .

[0053] Further, as a preferred embodiment, the manual stop valve 3 also includes: a valve stem 32, the valve stem 32 is threadedly connected to the valve cover 31, both ends of the valve stem 32 pass through the valve cover 31, a hexagonal nut 34 is fixed to the upper end of the valve stem 32, the hexagonal nut 34 is used to facilitate the rotation of the valve stem 32, a sealing member 33 is provided at the bottom of the valve stem 32, the sealing member 33 is used to seal the gas channel 112, when the hexagonal nut 34 is rotated clockwise to drive the valve stem 32 to move downward, the sealing member 33 moves downward to block the gas channel 112 to achieve sealing.

[0054] Furthermore, as a preferred embodiment, an O-ring three is arranged between the valve cover 2 31 and the valve body 1, and the valve cover 2 31 is sealed by the O-ring three and the valve body 1, and an O-ring four is arranged between the valve stem 2 32 and the valve cover 2 31, and the valve stem 2 32 is sealed by the O-ring four and the valve cover 2 31.

[0055] Safety relief valve 4:

[0056] In addition, as a preferred embodiment, please continue to refer to Figure 1 and Figure 3 As shown, the safety pressure relief valve 4 includes: a sealing shell 46, which is threadedly connected to the valve body 1, and the sealing shell 46 is a hollow structure with openings at both ends.

[0057] In addition, as a preferred embodiment, the safety pressure relief valve 4 also includes: a pressure relief valve body 41, which is threadedly connected to the sealing shell 46, and the pressure relief valve body 41 is a hollow structure with openings at both ends, and an annular step 411 is provided on the upper side of the interior of the pressure relief valve body 41.

[0058] Furthermore, as a preferred embodiment, the safety pressure relief valve 4 also includes: a valve core 42, the valve core 42 is arranged in the pressure relief valve body 41, a sealing cap 43 is provided at the upper end of the valve core 42, the lower surface of the sealing cap 43 is in contact with the upper surface of the annular step 411, and a base 44 is fixed to the lower end of the valve core 42.

[0059] Further, as a preferred embodiment, the safety pressure relief valve 4 also includes: a return spring 45, the return spring 45 is sleeved on the valve core 42, and the two ends of the return spring 45 are respectively connected to the annular step 411 and the base 44.

[0060] Furthermore, as a preferred embodiment, a pressure relief interface 461 is opened at the upper end of the sealing shell 46, and the pressure relief interface 461 is used to install a discharge pipe (not shown in the figure), and the air flow in the safety pressure relief valve 4 is discharged to the outside through the discharge pipe.

[0061] Working principle of the safety pressure relief valve 4: when the air flow pressure flowing through channel three 113 is below the set pressure value, the safety pressure relief valve 4 is in a closed state; when the air flow pressure of channel three 113 exceeds the set pressure value, the high-pressure air flow pushes the valve core 42 and the base 44 to move upward, and at the same time the base 44 compresses the reset spring 45, the sealing cap 43 disengages from the annular step 411, and the safety pressure relief valve 4 is opened; when the air flow pressure of channel three 113 becomes smaller, the valve core 42 and the base 44 move downward at the same time under the tension of the reset spring 45, and the sealing cap 43 is re-sealed with the annular step 411.

[0062] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A new integrated multifunctional pressure reducing valve, characterized in that: include: A valve body (1), wherein a main passage (11) is provided in the valve body (1), a pressure reducing valve inlet (12) and a pressure reducing valve outlet (13) are provided on an outer wall of the valve body (1), and the pressure reducing valve outlet (13) is communicated with the main passage (11); a pressure reducing valve (2), the pressure reducing valve (2) being arranged in the valve body (1) on a side close to the pressure reducing valve inlet (12), the pressure reducing valve (2) being located between the pressure reducing valve inlet (12) and the main passage (11), the pressure reducing valve (2) being used to adjust the pressure of the airflow flowing to the main passage (11); The pressure reducing valve (2) comprises: a valve cover 1 (21), the valve cover 1 (21) being threadedly connected to the valve body (1), the valve cover 1 (21) and the valve body (1) forming a cavity 1, a cavity 2 being provided on the valve body (1) at the bottom of the cavity 1, the cavity 2 being in communication with the main passage (11); A pressure regulating mechanism, the pressure regulating mechanism being arranged in the cavity one, the pressure regulating mechanism comprising an upper spring seat (221), a pressure regulating spring (222) and a lower spring seat (223), and two ends of the pressure regulating spring (222) being respectively connected to the upper spring seat (221) and the lower spring seat (223); A pressure stabilizing mechanism, the pressure stabilizing mechanism is arranged in the second cavity, the pressure stabilizing mechanism comprises a valve seat (231), a valve stem (232) and a pressure stabilizing spring (233), the valve seat (231) is fixed to the upper part of the second cavity, a valve plate (234) is provided at the bottom of the valve seat (231), the upper end of the valve stem (232) passes through the valve seat (231) and abuts against the lower surface of the lower spring seat (223), and the pressure stabilizing spring (233) is sleeved on the valve stem (232); The valve body (1) is provided with a pressure reducing valve breathing port (14), and the pressure reducing valve breathing port (14) is in communication with the cavity; The pressure reducing valve inlet (12) is connected to the bottom of the cavity one through a channel four (15); A manual stop valve (3), the manual stop valve (3) being arranged in the valve body (1), the manual stop valve (3) being located on one side of the pressure reducing valve (2), and the manual stop valve (3) being used to control the interruption of the gas flow in the main channel (11); a safety pressure relief valve (4), the safety pressure relief valve (4) being arranged in the valve body (1), the safety pressure relief valve (4) being located on the other side of the manual stop valve (3) relative to the pressure reducing valve (2), the safety pressure relief valve (4) being used to control the discharge of airflow in the main channel (11); The safety pressure relief valve (4) comprises: A sealing shell (46), wherein the sealing shell (46) is threadedly connected to the valve body (1), and the sealing shell (46) is a hollow structure with openings at both ends; A pressure relief valve body (41), the pressure relief valve body (41) being threadedly connected to the sealing housing (46), the pressure relief valve body (41) being a hollow structure with openings at both ends, and an annular step (411) being provided on the upper side of the interior of the pressure relief valve body (41); A valve core (42), the valve core (42) being arranged in the pressure relief valve body (41), a sealing cap (43) being arranged at the upper end of the valve core (42), a lower surface of the sealing cap (43) being in contact with the upper surface of the annular step (411), and a base (44) being fixed at the lower end of the valve core (42); A return spring (45), wherein the return spring (45) is sleeved on the valve core (42), and two ends of the return spring (45) are respectively connected to the annular step (411) and the base (44); A pressure sensor (5), wherein the pressure sensor (5) is arranged in the valve body (1) on a side close to the pressure reducing valve outlet (13), and the pressure sensor (5) is used to monitor the airflow pressure value in the main channel (11) in real time.

2. The novel integrated multifunctional pressure reducing valve according to claim 1 is characterized in that: The valve cover (21) is provided with an adjusting screw (211), and the lower end of the adjusting screw (211) abuts against the upper surface of the upper spring seat (221).

3. The novel integrated multifunctional pressure reducing valve according to claim 1 is characterized in that: The main channel (11) comprises a channel one (111), a channel two (112) and a channel three (113) which are connected in sequence, the channel one (111) and the channel three (113) are respectively located on both sides of the channel two (112), the channel one (111) and the channel three (113) are both perpendicular to the channel two (112), the manual stop valve (3) is connected to the channel two (112), the central axis of the manual stop valve (3) coincides with the central axis of the channel two (112), and the safety pressure relief valve (4) and the pressure sensor (5) are both connected to the channel three (113).

4. The novel integrated multifunctional pressure reducing valve according to claim 1 is characterized in that: The manual stop valve (3) comprises a second valve cover (31) and a second valve stem (32) threadedly connected to the second valve cover (31); the second valve cover (31) is threadedly connected to the valve body (1); and a sealing member (33) is provided at the bottom of the second valve stem (32).

5. The novel integrated multifunctional pressure reducing valve according to claim 1 is characterized in that: The upper end of the sealing housing (46) is provided with a pressure relief interface (461).

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