Pressure reduction type energy recovery device and vehicle

Abstract

The invention provides a pressure reduction type energy recovery device and a vehicle, and relates to the technical field of pressure reduction and energy recovery, and the pressure reduction type energy recovery device comprises a cylinder body, an air inlet valve, a pressure reducing valve, a piston and a power transmission device; the cylinder body is provided with a flow inlet and a flow outlet, the air inlet valve is mounted at the flow inlet, and the pressure reducing valve is mounted at the flow outlet; the flow inlet is formed in one end of the cylinder body, and the flow outlet is formed in the side wall of the cylinder body and located in the axial middle of the cylinder body. The piston is in sliding fit in the cylinder body, the flow outlet is located in the stroke middle section of the piston, and the piston is in transmission connection with the power transmission device. The pressure reduction device can not only realize step-by-step pressure reduction, but also convert high-pressure potential energy into kinetic energy of a power transmission device, realizes energy recycling, improves the energy utilization rate, is particularly suitable for vehicle-mounted high-pressure gas pressure reduction, and is beneficial to prolonging the endurance mileage of a vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of decompression and energy recovery, and in particular to a decompression type energy recovery device and a vehicle. Background Art

[0002] In the past, pressure reducing valves mainly produced different degrees of throttling and pressure reducing effects by adjusting the opening of the valve core, thereby reducing the pressure to the target pressure. During the pressure reduction process, the fluid flows through a small diameter, causing an adiabatic entropy increase process, and the fluid pressure is reduced. Since the high-pressure potential energy of the fluid is dissipated during the entropy increase process, energy loss occurs. In hydrogen storage vehicles, high-pressure hydrogen is highly corrosive, and the temperature changes greatly during the pressure reduction process, which causes corrosion, hydrogen embrittlement, fatigue damage, etc. to the pressure reducing valve. When used for a long time, the pressure reducing valve may be damaged, which may cause vehicle accidents. Summary of the invention

[0003] The object of the present invention is to provide a decompression type energy recovery device and a vehicle to alleviate the technical problem of high-pressure potential energy loss and waste during the decompression process.

[0004] In a first aspect, the present invention provides a pressure-reducing energy recovery device, comprising: a cylinder, an intake valve, a pressure-reducing valve, a piston and a power transmission device;

[0005] The cylinder body has an inlet and an outlet, the air intake valve is installed at the inlet, and the pressure reducing valve is installed at the outlet;

[0006] The inlet is arranged at one end of the cylinder body, the outlet is arranged at the side wall of the cylinder body, and the outlet is located in the axial middle part of the cylinder body;

[0007] The piston is slidably fitted in the cylinder body, the outlet is located in the middle of the stroke of the piston, and the piston is drivingly connected to the power transmission device.

[0008] In combination with the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the power transmission device includes: an inertia wheel and a connecting rod, the inertia wheel is rotatably connected to the frame, one end of the connecting rod is hinged to the piston, and the other end of the connecting rod is hinged to a position of the inertia wheel that deviates from the wheel axle.

[0009] In combination with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the piston is provided with a crank groove, and one end of the connecting rod is engaged in the crank groove through a ball head so that the connecting rod is hinged to the piston.

[0010] In combination with the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the intake valve comprises: a sleeve cover, an intake valve and a first spring;

[0011] The cover is connected to the outside of the inlet and cooperates with the inlet to form a fluid inlet;

[0012] The first spring is installed between the cover and the intake valve, and the first spring has a tendency to make the intake valve extend into the cylinder body through the inlet port and block the inlet port.

[0013] In combination with the third possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the piston is opposite to the intake valve, and the piston is provided with a ejector pin;

[0014] When the piston shrinks into the cylinder to the retraction dead point position, the ejector needle portion pushes the intake valve to open the intake valve.

[0015] In combination with the third possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein the cover comprises: a sleeve and a plug, one end of the sleeve is connected to the inlet, and the other end is connected to the plug, and a side wall of the sleeve is provided with a side opening;

[0016] The sleeve is connected to the inlet, and a side opening is provided on a side wall of the sleeve;

[0017] The intake valve is slidably fitted in the sleeve, and the first spring is squeezed between the intake valve and the plug.

[0018] In combination with the third possible implementation of the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein the air intake valve comprises: a blocking disk and a column connected to the blocking disk;

[0019] The outer wall of the column is provided with an air inlet groove extending in the axial direction, and the column is inserted into the inlet;

[0020] When the air inlet valve is open, the blocking disk is spaced apart from the inlet port so that the fluid enters the inner cavity of the cylinder through the air inlet groove;

[0021] When the air intake valve is closed, the blocking disk blocks the inlet port.

[0022] In combination with the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein the pressure reducing valve comprises: a chamber housing, a sealing body, a valve core, a second spring and a spring cover;

[0023] The chamber shell is connected to the outlet, and the sealing body, the valve core, the second spring and the spring cover are respectively installed inside the chamber shell;

[0024] The second spring is sleeved on the valve core, and the second spring is compressed between the spring cover and the valve core;

[0025] When the pressure reducing valve is opened, the spring cover pushes the second spring, and the spring cover is separated from the sealing body, and the sealing body is in fluid communication with the valve core to form a pressure reducing passage;

[0026] When the pressure reducing valve is closed, the second spring pushes the spring cover and causes the spring cover to seal the sealing body.

[0027] In combination with the seventh possible implementation manner of the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein the chamber shell comprises: a connecting sleeve and an outer shell, the connecting sleeve is connected to the outer shell, and the connecting sleeve is connected to the outlet;

[0028] The valve core, the second spring, the spring cover and the connecting sleeve are sequentially inserted into the outer shell, the sealing body is located between the connecting sleeve and the spring cover, and the sealing body is inserted into the connecting sleeve and axially limited and fixed;

[0029] When the pressure reducing valve is in a closed state, the spring cover abuts against the connecting sleeve.

[0030] In a second aspect, the present invention provides a vehicle equipped with the decompression type energy recovery device described in the first aspect.

[0031] The embodiments of the present invention bring the following beneficial effects: a cylinder body with an inlet and an outlet is adopted, an intake valve is installed at the inlet, a pressure reducing valve is installed at the outlet, a piston is slidably fitted in the cylinder body, and the piston is transmission-connected to a power transmission device, which can not only realize step-by-step pressure reduction, but also convert high-pressure potential energy into kinetic energy of the power transmission device, thereby realizing energy recovery and utilization and improving energy utilization rate.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A cross-sectional view of a pressure-reducing energy recovery device provided by an embodiment of the present invention;

[0035] Figure 2 An exploded diagram of an intake valve of a pressure-reducing energy recovery device provided by an embodiment of the present invention;

[0036] Figure 3 A cross-sectional view of a pressure reducing valve of a pressure reducing energy recovery device provided by an embodiment of the present invention;

[0037] Figure 4 A cross-sectional view of a sealing body of a pressure-reducing energy recovery device provided in an embodiment of the present invention.

[0038] Icons: 100 - cylinder body; 101 - inlet; 102 - outlet; 200 - intake valve; 201 - side opening; 202 - intake groove; 210 - sleeve cover; 211 - sleeve; 212 - plug; 220 - intake valve; 221 - blocking disk; 222 - cylinder; 230 - first spring; 300 - pressure reducing valve; 310 - chamber shell; 311 - connecting sleeve; 312 - outer shell; 320 - sealing body; 321 - through hole; 330 - valve core; 340 - second spring; 350 - spring cover; 400 - piston; 401 - crank groove; 402 - ejector pin; 500 - power transmission device; 501 - ball head; 510 - inertia wheel; 520 - connecting rod. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0040] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the base units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] like Figure 1 As shown, the pressure-reducing energy recovery device provided by the embodiment of the present invention includes: a cylinder body 100, an intake valve 200, a pressure-reducing valve 300, a piston 400 and a power transmission device 500; the cylinder body 100 has an inlet 101 and an outlet 102, the intake valve 200 is installed at the inlet 101, and the pressure-reducing valve 300 is installed at the outlet 102; the piston 400 is slidably fitted in the cylinder body 100, and the piston 400 is transmission-connected to the power transmission device 500.

[0043] Specifically, high-pressure gas can enter the inner cavity of the cylinder body 100 through the inlet port 101 when the intake valve 200 is opened, and the high-pressure gas will drive the piston 400 to slide along the cylinder body 100, and drive the power transmission device 500 through the piston 400; when the piston 400 moves to the tail of the cylinder body 100, the outlet port 102 is on the high-pressure side of the piston 400, and the gas in the inner cavity of the cylinder body 100 can be reduced in pressure through the pressure reducing valve 300 and discharged.

[0044] During the decompression process, the potential energy of the high-pressure gas is partially converted into the kinetic energy of the power transmission device 500, thereby achieving energy recovery and utilization while reducing the pressure, thereby improving energy utilization efficiency.

[0045] It should be noted that the inlet 101 is arranged at one end of the cylinder 100 , the outlet 102 is arranged on the side wall of the cylinder 100 , and the outlet 102 is located in the axial middle of the cylinder 100 , and the outlet 102 is located in the middle of the stroke of the piston 400 .

[0046] The complete working process of the pressure reducing energy recovery device is as follows:

[0047] The inlet valve 200 opens and high-pressure gas is injected into the cylinder 100 through the inlet port 101. The high-pressure gas drives the piston 400 to slide, thereby gradually increasing the volume of the closed chamber in the cylinder 100. In the initial stage, the outlet port 102 is located on the low-pressure side of the piston 400. As the piston 400 slides, when the piston 400 slides to the rear end of the cylinder 100, the outlet port 102 is in the gas chamber of the cylinder 100. Figure 1 , the outlet 102 is located between the piston 400 and the inlet 101. When the piston 400 is pushed by the high-pressure gas, the volume of the gas chamber of the cylinder 100 gradually increases and the internal gas pressure gradually decreases. Under the pressure difference and the inertia of the inertia wheel 510, the piston 400 will gradually move to the rear end of the cylinder 100. Subsequently, the inertia wheel 510 continues to rotate under the inertia, and the inertia wheel 510 drives the connecting rod 520, thereby pushing the piston 400 to slide in the opposite direction, thereby gradually reducing the volume of the gas chamber of the cylinder 100. When the outlet port 102 is in the gas chamber of the cylinder body 100, the gas in the cylinder body 100 can be discharged through the pressure reducing valve 300; when the piston 400 returns to its original position and pushes against the intake valve 200 located at the end, the intake valve 200 can be driven to open, and then the high-pressure gas can be injected into the cylinder body 100 through the inlet port 101, and then the piston 400 can be driven to slide toward the tail end of the cylinder body 100.

[0048] In an optional embodiment, the intake valve 200 and the pressure reducing valve 300 can be opened and closed by an electrically controlled controller. The controller adjusts the opening and closing states of the intake valve 200 and the pressure reducing valve 300 according to the changes in the air pressure in the inner cavity of the cylinder body 100, thereby accurately controlling the timing of intake and exhaust.

[0049] In this embodiment, both the intake valve 200 and the pressure reducing valve 300 can adopt a mechanical opening and closing structure, and the piston 400 retracted to the extreme position can drive the intake valve 200 to open, thereby opening the inlet port 101 and taking in air, thereby increasing the air pressure in the inner cavity of the cylinder body 100, and the piston 400 slides in the outward direction under the action of the high-pressure gas, thereby starting the next stroke.

[0050] In the embodiment of the present invention, the power transmission device 500 includes: an inertia wheel 510 and a connecting rod 520, wherein the inertia wheel 510 is rotatably connected to the frame, one end of the connecting rod 520 is hinged to the piston 400, and the other end of the connecting rod 520 is hinged to a position of the inertia wheel 510 that deviates from the wheel axle.

[0051] In an optional embodiment, the outlet 102 is located on the side wall of the cylinder 100, and the outlet 102 is close to the rear end of the cylinder 100. Before the pressure reducing valve 300 exhausts, the high-pressure potential energy of the high-pressure gas is converted into the kinetic energy of the power transmission device 500, so that when the pressure reducing valve 300 exhausts, the gas pressure has been reduced, and the pressure reducing valve 300 is less susceptible to corrosion and fatigue damage.

[0052] like Figure 1 As shown, the piston 400 is provided with a crank groove 401, and one end of the connecting rod 520 is fitted in the crank groove 401 through the ball head 501, so that the connecting rod 520 is hinged to the piston 400. A cover or a snap ring is installed at the open end of the crank groove 401 to limit the ball head 501 and prevent the ball head 501 from falling out of the crank groove 401.

[0053] like Figure 1 and Figure 2 As shown, the intake valve 200 includes: a cover 210, an intake valve 220 and a first spring 230; the cover 210 is connected to the outside of the inlet 101 and cooperates with the inlet 101 to form a fluid inlet; the first spring 230 is installed between the cover 210 and the intake valve 220, and the first spring 230 has a tendency to make the intake valve 220 pass through the inlet 101 and extend into the inner cavity of the cylinder 100 and block the inlet 101. When the air pressure in the cylinder 100 decreases and the piston 400 returns to the retraction stop position, the piston 400 pushes against the intake valve 220 and increases the elastic potential energy of the first spring 230, thereby opening the intake channel of the intake valve 200. After the intake is completed, the air pressure in the cylinder 100 increases, the piston 400 moves toward the rear end of the cylinder 100, and the first spring 230 drives the intake valve 220 to block the inlet 101.

[0054] It should be noted that the piston 400 is opposite to the intake valve 200 and is provided with a ejector pin 402. When the piston 400 is retracted into the cylinder 100 to the retraction stop position, the ejector pin 402 is inserted into the inlet port 101 and pushes the intake valve 220 to open the intake valve 200.

[0055] Furthermore, the cover 210 includes: a sleeve 211 and a plug 212, one end of the sleeve 211 is connected to the inlet 101, and the other end is connected to the plug 212, and the side wall of the sleeve 211 is provided with a side opening 201; the intake valve 220 is slidably fitted in the sleeve 211, and the first spring 230 is squeezed between the intake valve 220 and the plug 212.

[0056] The air intake valve 220 includes a blocking disk 221 and a column 222 connected to the blocking disk 221 . The outer wall of the column 222 is provided with an air intake groove 202 extending along the axial direction, and the column 222 is inserted into the inlet port 101 .

[0057] When the air intake valve 200 is open, the blocking disk 221 is spaced apart from the inlet port 101 , and the blocking disk 221 is located in the middle of the side opening 201 along the axial direction of the sleeve cover 210 , so that the fluid enters the inner cavity of the cylinder body 100 through the air intake groove 202 .

[0058] When the air intake valve 200 is closed, the blocking disk 221 blocks the inlet 101 , and the blocking disk 221 is offset from the side opening 201 to separate the side opening 201 from the inlet 101 .

[0059] like Figure 1 , Figure 3 and Figure 4 As shown, the pressure reducing valve 300 comprises: a chamber housing 310, a sealing body 320, a valve core 330, a second spring 340 and a spring cover 350; the chamber housing 310 is connected to the outlet 102, the sealing body 320, the valve core 330, the second spring 340 and the spring cover 350 are respectively installed inside the chamber housing 310; the second spring 340 is sleeved on the valve core 330, and the second spring 340 is pressed between the spring cover 350 and the valve core 330. Among them, a plurality of axially penetrating through holes 321 are arranged on the sealing body 320, and the plurality of through holes 321 are arranged at intervals along the circumference of the sealing body 320.

[0060] When the pressure reducing valve 300 is opened, the spring cover 350 pushes the second spring 340 , and the spring cover 350 is separated from the sealing body 320 , and the sealing body 320 is fluidically connected with the valve core 330 to form a pressure reducing passage.

[0061] When the pressure reducing valve 300 is in a closed state, the second spring 340 pushes the spring cover 350 , and the spring cover 350 blocks the sealing body 320 , thereby closing the outlet 102 .

[0062] Furthermore, the chamber shell 310 includes: a connecting sleeve 311 and an outer shell 312, the connecting sleeve 311 is connected to the outer shell 312, and the connecting sleeve 311 is connected to the outlet 102; the valve core 330, the second spring 340, the spring cover 350 and the connecting sleeve 311 are inserted into the outer shell 312 in sequence, the sealing body 320 is located between the connecting sleeve 311 and the spring cover 350, and the sealing body 320 is inserted into the connecting sleeve 311, and the end of the sealing body 320 away from the spring cover 350 abuts against the inner hole shoulder of the connecting sleeve 311, so as to realize the axial limit fixation of the sealing body 320 relative to the connecting sleeve 311; when the pressure reducing valve 300 is closed, the spring cover 350 abuts against the connecting sleeve 311, and the spring cover 350 blocks the through hole 321 of the sealing body 320.

[0063] The above-mentioned decompression type energy recovery device has the following beneficial effects:

[0064] (1) The potential energy of high-pressure fluid can be recovered and utilized;

[0065] (2) The pressure regulation does not depend on the elastic force of the spring, and there is no deviation in the pressure relief performance due to spring fatigue damage;

[0066] (3) Before the pressure reducing valve 300 is exhausted, the potential energy of the high-pressure fluid is converted into the kinetic energy of the power transmission device 500, thereby reducing the corrosion and impact of the high-pressure fluid on the pressure reducing valve 300 and improving the durability of the equipment;

[0067] (4) Pressure regulation does not rely on springs, and there is no need for springs to drive the valve core to vibrate back and forth, so there is no obvious vibration, which improves the quietness of the product.

[0068] The vehicle provided by the embodiment of the present invention is equipped with the decompression type energy recovery device described in any of the above embodiments. The kinetic energy of the power transmission device 500 can be used to generate electricity or drive other devices, which not only realizes the recycling of high-voltage potential energy, but also helps to extend the vehicle's cruising range.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A decompression type energy recovery device, characterized in that: include: A cylinder body (100), an intake valve (200), a pressure reducing valve (300), a piston (400) and a power transmission device (500); The cylinder body (100) has an inlet (101) and an outlet (102), the air intake valve (200) is installed at the inlet (101), and the pressure reducing valve (300) is installed at the outlet (102); The inlet (101) is arranged at one end of the cylinder body (100), the outlet (102) is arranged on the side wall of the cylinder body (100), and the outlet (102) is located in the axial middle part of the cylinder body (100); The piston (400) is slidably fitted in the cylinder body (100), the outlet (102) is located in the middle of the stroke of the piston (400), and the piston (400) is drivingly connected to the power transmission device (500).

2. The decompression type energy recovery device according to claim 1, characterized in that: The power transmission device (500) comprises: an inertia wheel (510) and a connecting rod (520); the inertia wheel (510) is rotatably connected to a frame; one end of the connecting rod (520) is hinged to the piston (400); and the other end of the connecting rod (520) is hinged to a position of the inertia wheel (510) that deviates from the wheel axle.

3. The decompression type energy recovery device according to claim 2, characterized in that: The piston (400) is provided with a crank groove (401), and one end of the connecting rod (520) is fitted into the crank groove (401) through a ball head (501), so that the connecting rod (520) and the piston (400) are hinged.

4. The decompression type energy recovery device according to claim 1, characterized in that: The air intake valve (200) comprises: a cover (210), an air intake valve (220) and a first spring (230); The cover (210) is connected to the outside of the inlet (101) and cooperates with the inlet (101) to form a fluid inlet; The first spring (230) is installed between the cover (210) and the intake valve (220), and the first spring (230) has a tendency to allow the intake valve (220) to pass through the inlet port (101) and extend into the inner cavity of the cylinder body (100) and block the inlet port (101).

5. The decompression type energy recovery device according to claim 4, characterized in that: The piston (400) is opposite to the intake valve (200), and the piston (400) is provided with a ejector pin (402); When the piston (400) shrinks into the cylinder (100) to the retraction stop position, the ejector needle (402) pushes the intake valve (220) to open the intake valve (200).

6. The decompression type energy recovery device according to claim 4, characterized in that: The sleeve cover (210) comprises: a sleeve (211) and a plug (212); one end of the sleeve (211) is connected to the inlet (101), and the other end is connected to the plug (212); and a side opening (201) is provided on a side wall of the sleeve (211); The air intake valve (220) is slidably fitted in the sleeve (211), and the first spring (230) is squeezed between the air intake valve (220) and the plug (212).

7. The decompression type energy recovery device according to claim 4, characterized in that: The air intake valve (220) comprises: a blocking disk (221) and a column (222) connected to the blocking disk (221); The outer wall of the column (222) is provided with an air inlet groove (202) extending in the axial direction, and the column (222) is inserted into the inlet port (101); When the air intake valve (200) is open, the blocking disk (221) is spaced apart from the inlet port (101) so that the fluid enters the inner cavity of the cylinder body (100) through the air intake groove (202); When the air intake valve (200) is in a closed state, the blocking disk (221) blocks the inlet port (101).

8. The decompression type energy recovery device according to claim 1, characterized in that: The pressure reducing valve (300) comprises: a chamber housing (310), a sealing body (320), a valve core (330), a second spring (340) and a spring cover (350); The chamber housing (310) is connected to the outlet (102), and the sealing body (320), the valve core (330), the second spring (340) and the spring cover (350) are respectively installed inside the chamber housing (310); The second spring (340) is sleeved on the valve core (330), and the second spring (340) is compressed between the spring cover (350) and the valve core (330); When the pressure reducing valve (300) is opened, the spring cover (350) pushes the second spring (340), and the spring cover (350) is separated from the sealing body (320), and the sealing body (320) is fluidically connected to the valve core (330) to form a pressure reducing channel; When the pressure reducing valve (300) is in a closed state, the second spring (340) pushes the spring cover (350) and causes the spring cover (350) to seal the sealing body (320).

9. The decompression type energy recovery device according to claim 8, characterized in that: The cavity shell (310) comprises: a connecting sleeve (311) and an outer shell (312), wherein the connecting sleeve (311) is connected inside the outer shell (312), and the connecting sleeve (311) is connected to the outlet (102); The valve core (330), the second spring (340), the spring cover (350) and the connecting sleeve (311) are sequentially inserted into the outer shell (312), the sealing body (320) is located between the connecting sleeve (311) and the spring cover (350), and the sealing body (320) is inserted into the connecting sleeve (311) and axially limited and fixed; When the pressure reducing valve (300) is in a closed state, the spring cover (350) abuts against the connecting sleeve (311).

10. A vehicle, characterized in that: The vehicle is equipped with a pressure-reducing energy recovery device as described in any one of claims 1 to 9.

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