CN220581803U - Decompression type energy recovery device and vehicle - Google Patents

Abstract

The utility model provides a decompression type energy recovery device and a vehicle, and relates to the technical field of decompression and energy recovery, and the decompression type energy recovery device comprises: the 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 an inlet and an outlet, the inlet valve is arranged at the inlet, and the pressure reducing valve is arranged at the outlet; the air inlet is arranged at one end of the cylinder body, and the air outlet is arranged on the side wall of the cylinder body and is positioned in the axial middle of the cylinder body; the piston is in sliding fit in the cylinder body, the outflow port is positioned in the middle section of the stroke of the piston, and the piston is in transmission connection with the power transmission device. The device can realize gradual decompression, can convert high-pressure potential energy into kinetic energy of a power transmission device, realizes energy recycling, improves energy utilization rate, is particularly suitable for vehicle-mounted high-pressure gas decompression, and is beneficial to prolonging the endurance mileage of a vehicle.

Description

Decompression type energy recovery device and vehicle

Technical Field

The utility model relates to the technical field of decompression and energy recovery, in particular to a decompression type energy recovery device and a vehicle.

Background

In the prior art, the pressure reducing valve mainly generates throttling and reducing effects with different degrees by adjusting the opening amount of the valve core, so that the pressure is reduced to the target pressure. In the depressurizing process, the fluid flows through the small caliber, so that the adiabatic entropy increasing process occurs, and the pressure of the fluid is reduced. Energy losses are generated due to the dissipation of the high pressure potential energy of the fluid during the entropy increase. In hydrogen-storage vehicles, high-pressure hydrogen has strong corrosiveness, and the temperature change in the pressure reducing process is large, so that the pressure reducing valve is corroded, hydrogen embrittled, fatigued and the like. When the pressure reducing valve is used for a long time, the pressure reducing valve can be damaged, and further vehicle accidents are caused.

Disclosure of Invention

The utility model aims to provide a decompression type energy recovery device and a vehicle, so as to solve the technical problem of high-pressure potential energy loss and waste in the decompression process.

In a first aspect, the present utility model provides a pressure-reducing energy recovery device, comprising: the 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 an inlet and an outlet, the inlet valve is arranged at the inlet, and the pressure reducing valve is arranged at the outlet;

the air inlet is arranged at one end of the cylinder body, the air outlet is arranged on the side wall of the cylinder body, and the air outlet is positioned in the middle of the axial direction of the cylinder body;

the piston is in sliding fit in the cylinder body, the outflow port is located in the middle of the stroke of the piston, and the piston is in transmission connection with the power transmission device.

With reference to the first aspect, the present utility model provides a first possible implementation manner of the first aspect, wherein the power transmission device includes: the inertial wheel disc is rotationally 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 the position, deviating from the wheel shaft, of the inertial wheel disc.

With reference to the first possible implementation manner of the first aspect, the present utility model provides a second possible implementation manner of the first aspect, wherein the piston is provided with a crank groove, and one end of the connecting rod is fitted in the crank groove through a ball head portion, so that the connecting rod is hinged with the piston.

With reference to the first aspect, the present utility model provides a third possible implementation manner of the first aspect, wherein the air intake valve includes: the air inlet valve comprises a sleeve cover, an air inlet valve and a first spring;

the sleeve cover is connected to the outer side of the flow inlet and is matched with the flow inlet to form a fluid inlet;

the first spring is arranged between the sleeve cover and the air inlet valve, and has the tendency that the air inlet valve penetrates through the air inlet opening to extend into the inner cavity of the cylinder body and is used for sealing the air inlet opening.

With reference to the third possible implementation manner of the first aspect, the present utility model provides a fourth possible implementation manner of the first aspect, wherein the piston is opposite to the air inlet valve, and the piston is provided with a thimble portion;

when the piston is retracted into the cylinder body to a retreating dead point position, the thimble part pushes the air inlet valve so as to open the air inlet valve.

With reference to the third possible implementation manner of the first aspect, the present utility model provides a fifth possible implementation manner of the first aspect, wherein the cover includes: the sleeve is characterized by comprising a sleeve and a plug, wherein one end of the sleeve is communicated with the inlet, the other end of the sleeve is connected with the plug, and a side opening is formed in the side wall of the sleeve;

the sleeve is connected to the inlet, and a side opening is formed in the side wall of the sleeve;

the air inlet valve is in sliding fit in the sleeve, and the first spring is extruded between the air inlet valve and the plug.

With reference to the third possible implementation manner of the first aspect, the present utility model provides a sixth possible implementation manner of the first aspect, wherein the air intake valve includes: the plugging device comprises a plugging disc and a column body connected with the plugging disc;

the outer wall of the cylinder is provided with an air inlet groove extending along the axial direction, and the cylinder is inserted into the flow inlet;

when the air inlet valve is opened, the blocking disc is spaced from the air inlet so that fluid enters the inner cavity of the cylinder body through the air inlet groove;

and in the state that the air inlet valve is closed, the blocking disc blocks the flow inlet.

With reference to the first aspect, the present utility model provides a seventh possible implementation manner of the first aspect, wherein the pressure reducing valve includes: the valve comprises a cavity shell, a sealing body, a valve core, a second spring and a spring cover;

the cavity shell is connected with the outflow port, and the sealing body, the valve core, the second spring and the spring cover are respectively arranged in the cavity shell;

the second spring is sleeved on the valve core, and is compressed between the spring cover and the valve core;

in a state in which 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 channel;

and in a state that the pressure reducing valve is closed, the second spring pushes the spring cover, and the spring cover seals the sealing body.

With reference to the seventh possible implementation manner of the first aspect, the present utility model provides an eighth possible implementation manner of the first aspect, wherein the cavity shell includes: the connecting sleeve is connected to the outer shell, and the connecting sleeve is connected to the outflow port;

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

in the state that the pressure reducing valve is closed, the spring cover is abutted against the connecting sleeve.

In a second aspect, the present utility model provides a vehicle equipped with the decompression type energy recovery device according to the first aspect.

The embodiment of the utility model has the following beneficial effects: the cylinder body with the inlet and the outlet is adopted, the inlet valve is arranged at the inlet, the pressure reducing valve is arranged at the outlet, the piston is in sliding fit in the cylinder body, and the piston is in transmission connection with the power transmission device, so that gradual pressure reduction can be realized, high-pressure potential energy can be converted into kinetic energy of the power transmission device, energy recycling is realized, and the energy utilization rate is improved.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the related art, the drawings that are required to be used in the description of the embodiments or the related art will be briefly described, and it is apparent that the drawings in the description below are some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a cross-sectional view of a pressure-reducing energy recovery device provided by an embodiment of the present utility model;

FIG. 2 is an exploded view of an intake valve of a pressure reducing energy recovery device according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a pressure relief valve of a pressure relief energy recovery device provided by an embodiment of the present utility model;

fig. 4 is a cross-sectional view of a sealing body of a pressure-reducing energy recovery device according to an embodiment of the present utility model.

Icon: 100-cylinder body; 101-a flow inlet; 102-a flow outlet; 200-an air inlet valve; 201-side opening; 202-an air inlet groove; 210-a cover; 211-sleeve; 212-plugs; 220-an intake valve; 221-a plugging disc; 222-column; 230-a first spring; 300-a pressure reducing valve; 310-cavity shell; 311-connecting sleeve; 312-an outer housing; 320-sealing body; 321-through holes; 330-valve core; 340-a second spring; 350-spring cover; 400-piston; 401-crank groove; 402-thimble part; 500-power transmission devices; 501-a bulb part; 510-an inertial wheel; 520-connecting rod.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Physical quantities in the formulas, unless otherwise noted, are understood to be basic quantities of basic units of the international system of units, or derived quantities derived from the basic quantities by mathematical operations such as multiplication, division, differentiation, or integration.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, a decompression type energy recovery device provided by an embodiment of the present utility model includes: cylinder 100, intake valve 200, pressure reducing valve 300, piston 400, and power transmission device 500; the cylinder 100 has an inlet 101 and an outlet 102, the inlet valve 200 is mounted on the inlet 101, and the pressure reducing valve 300 is mounted on the outlet 102; the piston 400 is slidably fitted in the cylinder 100, and the piston 400 is drivingly connected to the power transmission device 500.

Specifically, when the air inlet valve 200 is opened, high-pressure air can enter the inner cavity of the cylinder body 100 through the air inlet 101, the high-pressure air drives the piston 400 to slide along the cylinder body 100, and the power transmission device 500 is driven by the piston 400; when the piston 400 moves to the tail of the cylinder body 100, the outflow port 102 is positioned at the high pressure side of the piston 400, and the gas in the inner cavity of the cylinder body 100 can be decompressed and discharged through the decompression valve 300.

In the depressurization process, the potential energy of the high-pressure gas is partially converted into the kinetic energy of the power transmission device 500, so that the energy recovery and utilization are realized while the depressurization is performed, and the energy utilization rate is improved.

The inlet 101 is disposed at one end of the cylinder 100, the outlet 102 is disposed on a side wall of the cylinder 100, the outlet 102 is disposed at an axial middle portion of the cylinder 100, and the outlet 102 is disposed at a stroke middle portion of the piston 400.

The complete working process of the decompression type energy recovery device is as follows:

the intake valve 200 is opened, and high-pressure gas is injected into the cylinder 100 through the intake port 101, and the piston 400 is driven to slide by the high-pressure gas, so that the volume of the closed chamber in the cylinder 100 is gradually increased. Initially, the outflow port 102 is located on the low pressure side of the piston 400, and as the piston 400 slides, the outflow port 102 is located within the gas chamber of the cylinder 100 as the piston 400 slides to the trailing end of the cylinder 100, see fig. 1, with the outflow port 102 located between the piston 400 and the inflow port 101. During the pushing of the piston 400 by the high pressure gas, the volume of the gas chamber of the cylinder 100 is gradually increased, the internal gas pressure is gradually reduced, and the piston 400 is gradually moved to the tail end of the cylinder 100 under the pressure difference and the inertia of the inertia disc 510. Then, the inertia wheel 510 continues to rotate under the action of inertia, and the inertia wheel 510 drives the connecting rod 520 to push the piston 400 to slide reversely, so that the volume of the gas chamber of the cylinder 100 is gradually reduced. When the outflow port 102 is positioned in the gas chamber of the cylinder 100, the gas in the cylinder 100 can be discharged through the pressure reducing valve 300; when the piston 400 returns to the position and pushes against the air inlet valve 200 at the end, the air inlet valve 200 can be driven to open, so that high-pressure air can be injected into the cylinder 100 through the air inlet 101, and the piston 400 can be driven to slide towards the tail end of the cylinder 100.

In an alternative embodiment, the air inlet valve 200 and the pressure reducing valve 300 can be respectively opened and closed by adopting an electric control driving mode controller, and the controller can regulate and control the opening and closing states of the air inlet valve 200 and the pressure reducing valve 300 according to the air pressure change of the inner cavity of the cylinder body 100, so that the air inlet and air exhaust time can be accurately controlled.

In this embodiment, the air inlet valve 200 and the pressure reducing valve 300 can both adopt a mechanical opening and closing structure, and the piston 400 retracted to the limit position can drive the air inlet valve 200 to open, so that the air inlet 101 is opened and air is introduced, thereby increasing the air pressure in the inner cavity of the cylinder 100, and the piston 400 slides in the extending direction under the action of the high-pressure air, so as to open the next stroke.

In the embodiment of the present utility model, the power transmission device 500 includes: the inertia wheel 510 and the connecting rod 520, 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 the position of the inertia wheel 510 deviating from the wheel shaft.

In an alternative embodiment, the outflow port 102 is located at a side wall of the cylinder 100, and the outflow port 102 is near a trailing end of the cylinder 100. The high pressure potential energy of the high pressure gas is converted into the kinetic energy of the power transmission device 500 before the pressure reducing valve 300 is exhausted, whereby the gas pressure has been reduced when the pressure reducing valve 300 is exhausted, and the pressure reducing valve 300 is less subject to corrosion and fatigue damage.

As shown in fig. 1, 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 portion 501 so that the connecting rod 520 is hinged with the piston 400. Wherein, the open end of the crank groove 401 is provided with a sealing cover or a clamping ring for limiting the ball head 501, so as to prevent the ball head 501 from falling out of the crank groove 401.

As shown in fig. 1 and 2, 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 cap 210 and the intake valve 220, and the first spring 230 has a tendency to allow the intake valve 220 to extend into the inner cavity of the cylinder 100 through the intake port 101 and to block the intake port 101. When the air pressure in the cylinder 100 is reduced and the piston 400 returns to the retreating dead center 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 passage of the intake valve 200. After the air intake is completed, the air pressure in the cylinder 100 is increased, the piston 400 moves toward the tail end of the cylinder 100, and the first spring 230 drives the air intake valve 220 to block the air intake port 101.

It should be noted that, the piston 400 is opposite to the intake valve 200, and the piston 400 is provided with a thimble portion 402; when the piston 400 is retracted into the cylinder 100 to the retracted dead center position, the ejector pin portion 402 is inserted into the intake port 101 and pushes the intake valve 220 to open the intake valve 200.

Further, the cap 210 includes: the sleeve 211 and the plug 212, one end of the sleeve 211 is communicated with the inlet 101, the other end is connected with the plug 212, and the side wall of the sleeve 211 is provided with a side opening 201; the air intake valve 220 is slidably fitted in the sleeve 211, and the first spring 230 is pressed between the air intake valve 220 and the stopper 212.

The intake valve 220 includes: a blocking plate 221 and a column 222 connecting the blocking plate 221; the outer wall of the cylinder 222 is provided with an air inlet groove 202 extending along the axial direction, and the cylinder 222 is inserted into the air inlet 101.

In a state where the intake valve 200 is opened, the blocking plate 221 is spaced from the intake port 101, and the blocking plate 221 is located at the middle of the side opening 201 in the axial direction of the cap 210 so that the fluid enters the inner cavity of the cylinder 100 through the intake groove 202.

In a state where the intake valve 200 is closed, the blocking plate 221 blocks the intake port 101, and the blocking plate 221 is offset from the side opening 201 to separate the side opening 201 from the intake port 101.

As shown in fig. 1, 3, and 4, the pressure reducing valve 300 includes: a chamber housing 310, a sealing body 320, a valve cartridge 330, a second spring 340, and a spring cover 350; the chamber housing 310 is connected to the outflow port 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. The sealing body 320 is provided with a plurality of through holes 321 penetrating in the axial direction, and the plurality of through holes 321 are arranged at intervals along the circumferential direction of the sealing body 320.

In a state where 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 in fluid communication with the valve body 330 to form a pressure reducing passage.

In a state where the pressure reducing valve 300 is closed, the second spring 340 pushes the spring cover 350, and causes the spring cover 350 to block the sealing body 320, thereby closing the outflow port 102.

Further, the chamber housing 310 includes: the connecting sleeve 311 and the outer shell 312, wherein the connecting sleeve 311 is connected in the outer shell 312, and the connecting sleeve 311 is connected to the outflow port 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 positioned between the connecting sleeve 311 and the spring cover 350, the sealing body 320 is inserted into the connecting sleeve 311, and one end of the sealing body 320, which is away from the spring cover 350, is abutted against the shoulder of an inner hole of the connecting sleeve 311, so that the sealing body 320 is axially limited and fixed relative to the connecting sleeve 311; in a state where the pressure reducing valve 300 is closed, the spring cover 350 abuts against the connection sleeve 311, and the spring cover 350 seals the through hole 321 of the sealing body 320.

The decompression type energy recovery device has the following beneficial effects:

(1) The potential energy of the high-pressure fluid can be recycled;

(2) The pressure regulation is independent of the elastic force of the spring, so that the pressure reduction performance deviation caused by fatigue damage of the spring does not exist;

(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, so that the corrosion and impact of the high-pressure fluid on the pressure reducing valve 300 can be reduced, and the durability of equipment is improved;

(4) The pressure regulation does not depend on a spring, and the valve core is not required to be driven to vibrate in a reciprocating manner by the spring, so that obvious vibration does not exist, and the silence of the product is improved.

The vehicle according to the embodiment of the present utility model is provided with the pressure-reducing energy recovery device according to any one of the above embodiments. The kinetic energy of the power transmission device 500 can be utilized to generate power or drive other devices, so that the recycling of high-voltage potential energy is realized, and the continuous voyage mileage of the vehicle is prolonged.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A decompression type energy recovery device, characterized by comprising: a cylinder (100), an air inlet valve (200), a pressure reducing valve (300), a piston (400) and a power transmission device (500);

the cylinder body (100) is provided with an inlet (101) and an outlet (102), the air inlet valve (200) is arranged at the inlet (101), and the pressure reducing valve (300) is arranged at the outlet (102);

the air inlet (101) is arranged at one end of the cylinder body (100), the air outlet (102) is arranged on the side wall of the cylinder body (100), and the air outlet (102) is positioned in the middle of the axial direction of the cylinder body (100);

the piston (400) is in sliding fit in the cylinder body (100), the outflow port (102) is located in the middle of the stroke of the piston (400), and the piston (400) is in transmission connection with the power transmission device (500).

2. The decompression type energy recovery device according to claim 1, wherein the power transmission means (500) comprises: the inertial wheel disc (510) and the connecting rod (520), the inertial wheel disc (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 the position, deviating from the wheel shaft, of the inertial wheel disc (510).

3. The decompression type energy recovery device according to claim 2, wherein 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 portion (501) to hinge the connecting rod (520) with the piston (400).

4. The pressure reducing energy recovery device according to claim 1, wherein the intake valve (200) includes: a cover (210), an air inlet valve (220) and a first spring (230);

the sleeve cover (210) is connected to the outer side of the inlet (101) and is matched with the inlet (101) to form a fluid inlet;

the first spring (230) is installed between the cover (210) and the air inlet valve (220), and the first spring (230) has a tendency that the air inlet valve (220) penetrates through the air inlet opening (101) to extend into the inner cavity of the cylinder body (100) and seals the air inlet opening (101).

5. The decompression type energy recovery device according to claim 4, wherein the piston (400) is opposed to the intake valve (200), and the piston (400) is provided with a thimble portion (402);

when the piston (400) is retracted into the cylinder (100) to a retracted dead point position, the ejector pin part (402) pushes the air inlet valve (220) so as to open the air inlet valve (200).

6. The reduced pressure energy recovery apparatus of claim 4, wherein the shroud (210) comprises: the device comprises a sleeve (211) and a plug (212), wherein one end of the sleeve (211) is communicated with the inflow port (101), the other end of the sleeve is connected with the plug (212), and a side opening (201) is formed in the side wall of the sleeve (211);

the air inlet valve (220) is in sliding fit in the sleeve (211), and the first spring (230) is extruded between the air inlet valve (220) and the plug (212).

7. The decompression type energy recovery device according to claim 4, wherein the intake valve (220) includes: a plugging disc (221) and a column (222) connected with the plugging disc (221);

an air inlet groove (202) extending along the axial direction is formed in the outer wall of the cylinder (222), and the cylinder (222) is inserted into the flow inlet (101);

in a state that the air inlet valve (200) is opened, the blocking disc (221) is spaced from the air inlet (101) so that fluid enters the inner cavity of the cylinder body (100) through the air inlet groove (202);

the blocking disc (221) blocks the inflow port (101) in a state where the air inlet valve (200) is closed.

8. The pressure reducing energy recovery device according to claim 1, wherein the pressure reducing valve (300) includes: a chamber housing (310), a sealing body (320), a valve core (330), a second spring (340), and a spring cover (350);

the cavity shell (310) is connected to the outflow port (102), and the sealing body (320), the valve core (330), the second spring (340) and the spring cover (350) are respectively installed inside the cavity shell (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);

in a state in which 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 in fluid communication with the valve spool (330) to form a pressure reducing passage;

in a state in which the pressure reducing valve (300) is closed, the second spring (340) pushes the spring cover (350) and causes the spring cover (350) to close the sealing body (320).

9. The pressure reducing energy recovery device according to claim 8, wherein the chamber housing (310) comprises: the connecting sleeve (311) and the outer shell (312), wherein the connecting sleeve (311) is connected in the outer shell (312), and the connecting sleeve (311) is connected with the outflow port (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 positioned 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;

in a state where the pressure reducing valve (300) is closed, the spring cover (350) is abutted against the connecting sleeve (311).

10. A vehicle, characterized in that the vehicle is equipped with a decompression type energy recovery device according to any one of claims 1 to 9.