A controllable one-way valve assembly for hydrogen delivery

Abstract

The present invention discloses a controllable one-way valve assembly for hydrogen delivery, which relates to the technical field of gas intelligent delivery equipment, including a front valve assembly and a rear valve assembly; the front valve assembly includes a front valve body, a valve core, a first valve stem, a spring, a temperature sensor, a first sealing ring and a stopper; the rear valve assembly includes a rear valve body, a servo electric cylinder, a first piston, a second piston and a second valve stem, and the second valve stem is a high-temperature resistant brittle plastic stem. The functional structure of the present invention has good variability and a wide range of applications; it is easy to realize the dynamic control of the force required when the valve core is pushed open, and can play a role in regulating the hydrogen outlet temperature of the valve to a certain extent; it has explosion-proof characteristics. If the hydrogen temperature rises abnormally and sharply, the air pressure in the hydrogen flow cavity also rises sharply. Since the second valve stem is a high-temperature resistant brittle plastic rod, it has broken before reaching the explosion, and then the first piston moves backward. Under the buffering effect of the inert gas, the risk of explosion is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent gas delivery equipment, and in particular to a controllable one-way valve assembly for hydrogen delivery. Background Art

[0002] Hydrogen often requires multi-stage compression to achieve a larger pressure ratio. Hydrogen has a large number of slips. During the compression process, it is easy to cause the temperature to rise. It is necessary to limit the outlet temperature of each compression stage to no more than 135°C. After that, the hydrogen is transported to the next compression chamber to ensure stable transportation. The lower gas outlet temperature is also beneficial to the life and reliability of the gas valve, and also reduces the penetration of hydrogen in the material. One-way valves are common components in the hydrogen compression and transportation process. Their working principle is the same as that of hydraulic one-way valves. Compressed hydrogen enters, overcoming the spring force and friction to open the one-way valve port. The one-way valves we currently use for hydrogen transportation have the following defects:

[0003] 1) The functional structure has poor variability, and the structure cannot be improved on site according to actual conditions, so the scope of application is small;

[0004] 2) Due to the lack of explosion-proof structure, it is often necessary to rely entirely on external explosion-proof structure to achieve the explosion-proof function of hydrogen transportation, and its own function is relatively simple. Summary of the invention

[0005] The present invention provides a controllable one-way valve assembly for hydrogen delivery, which can alleviate the above problems.

[0006] In order to alleviate the above-mentioned problems, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a controllable one-way valve assembly for hydrogen delivery, comprising a front valve assembly and a rear valve assembly;

[0008] The front valve assembly includes a front valve body, a valve core, a first valve stem, a spring, a temperature sensor, a first sealing ring and a stopper;

[0009] The front end of the front valve body is a hydrogen outlet, and a spring sleeve shaft is fixed to the middle axis through a bracket; the spring is sleeved on the spring sleeve shaft, and the front end elastically abuts against the bracket, and the rear end elastically abuts against the block; the block is detachably fixed to the rear end of the first valve stem; the first valve stem is slidably sleeved and penetrates the spring sleeve shaft, and the front end of the first valve stem fixes the valve core; the valve core and the first sealing ring are assembled on the hydrogen outlet, and are used to open or close the hydrogen outlet; the temperature sensor is installed at a position of the front valve body close to the hydrogen outlet;

[0010] The rear valve assembly comprises a rear valve body, a servo electric cylinder, a first piston, a second piston and a second valve stem, wherein the second valve stem is a high temperature resistant brittle plastic stem;

[0011] The first piston, the second piston, the second valve stem and the first valve stem are arranged coaxially; the front end of the second valve stem is detachably fixed to the stopper, and the rear end is fixed to the first piston; the rear valve body is detachably connected to the front valve body; a piston sliding chamber is provided in the rear valve body, and the first piston and the second piston are slidably assembled in the piston sliding chamber; the part of the piston sliding chamber between the first piston and the second piston serves as an inert gas chamber and is filled with inert gas; the part of the piston sliding chamber in front of the first piston serves as a hydrogen circulation chamber and is connected to the hydrogen outlet of the front valve body; the rear valve body is provided with a hydrogen inlet located in front of the first piston and leading to the hydrogen circulation chamber; the inner wall of the hydrogen circulation chamber is provided with a piston limiter located behind the hydrogen inlet, which is used to ensure that the first piston is always located behind the hydrogen inlet; the piston connecting rod of the servo electric cylinder is coaxially connected to the rear of the second piston.

[0012] In a preferred embodiment of the present invention, the bracket is arranged vertically and the center is vertically fixed to the circular structure of the spring sleeve shaft, which has three fan-shaped holes that connect the front and rear parts of the inner cavity of the front valve body.

[0013] In a preferred embodiment of the present invention, the stopper is fixedly connected to the rear end of the first valve stem by a countersunk screw; the front end of the second valve stem is fixed to the stopper by two connecting screws.

[0014] In a preferred embodiment of the present invention, the hydrogen outlet is a bell mouth facing forward, and the first sealing ring is fixed to the valve core; the first sealing ring can seal the assembly gap of the hydrogen outlet of the valve core.

[0015] In a preferred embodiment of the present invention, the temperature sensing element of the temperature sensor is a circular ring structure sleeved on the front end of the front valve body.

[0016] In a preferred embodiment of the present invention, the rear valve body includes a first valve body and a second valve body; the front end of the first valve body is threaded and sealed to the front valve body, and the rear end is sealed to the front end of the second valve body through a flange assembly; the inner cavities of the first valve body and the second valve body constitute the piston sliding cavity; the first piston is slidably assembled on the first valve body, and the second piston is slidably assembled on the second valve body.

[0017] In a preferred embodiment of the present invention, a gas filling hole equipped with a sealing plug is opened on the side wall of the second valve body, and the gas filling hole leads to the inert gas chamber.

[0018] In a preferred embodiment of the present invention, a second sealing ring is provided between the front end of the first valve body and the rear end of the front valve body.

[0019] In a preferred embodiment of the present invention, the flange assembly includes a first flange component fixed to the first valve body, a second flange component fixed to the second valve body, a sealing gasket clamped between the first flange component and the second flange component, and bolts that fix the first flange component and the second flange component.

[0020] In a preferred embodiment of the present invention, the controllable one-way valve assembly also includes a control module, through which the temperature signal from the temperature sensor can be obtained, and the control instruction for driving the piston connecting rod to extend and retract can be output to the servo electric cylinder.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The controllable one-way valve assembly of the present invention is a front and rear combined structure. The front valve assembly can be used alone in a general environment, or the front and rear valve assemblies can be assembled together at the outlet of each level of hydrogen compression structure. The functional structure has good variability and a wide range of applications.

[0023] When the controllable one-way valve assembly of the present invention is a front-to-back combined structure, it is easy to dynamically control the force required when the valve core is pushed open, and can play a role in regulating the hydrogen outlet temperature of the valve to a certain extent;

[0024] When the controllable one-way valve assembly of the present invention is a front-to-rear combined structure, it has an explosion-proof feature. If the hydrogen temperature rises abnormally and rapidly, the gas pressure in the hydrogen flow chamber also rises rapidly. Since the second valve stem is a high-temperature resistant brittle plastic stem, it has broken before the explosion, and then the first piston moves backward. Under the buffering effect of the inert gas, the risk of explosion is reduced, and then a real explosion-proof effect is achieved. Moreover, since the valve assembly is a combined structure, it is easy to replace the new second valve stem.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the embodiments of the present invention are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a schematic cross-sectional structural diagram of the controllable one-way valve assembly of the present invention;

[0028] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0029] Figure 3 is a schematic structural diagram of the front valve assembly of the present invention;

[0030] Figure 4 It is a schematic block diagram of electrical control of the controllable one-way valve assembly of the present invention;

[0031] In the figure: 1-front valve body, 2-temperature sensor, 3-valve core, 4-first sealing ring, 5-bracket, 6-first valve stem, 7-spring, 8-spring sleeve, 9-second sealing ring, 10-first valve body, 11-hydrogen inlet, 12-hydrogen flow chamber, 13-second valve stem, 14-first piston, 15-inert gas chamber, 16-first flange, 17-second flange, 18-bolt, 19-sealing gasket, 20-sealing plug, 21-gas filling hole, 22-second piston, 23-piston connecting rod, 24-servo electric cylinder, 25-second valve body, 26-limiting member, 27-countersunk screw, 28-connecting screw, 29-stopper, 30-hydrogen outlet. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Please refer to Figure 1 to Figure 4 The present invention provides a controllable one-way valve assembly for hydrogen delivery, comprising a front valve assembly, a rear valve assembly and a control module.

[0037] The front valve assembly includes a front valve body 1, a valve core 3, a first valve stem 6, a spring 7, a temperature sensor 2, a first sealing ring 4 and a stopper 29. Figure 1 and Figure 3 shown.

[0038] The front end of the front valve body 1 is a hydrogen outlet 30, and a spring sleeve shaft 8 is fixed to the central axis through a bracket 5; the spring 7 is sleeved on the spring sleeve shaft 8, and the front end elastically abuts against the bracket 5, and the rear end elastically abuts against the block 29; the block 29 is detachably fixed to the rear end of the first valve stem 6; the first valve stem 6 is slidably sleeved and penetrates the spring sleeve shaft 8, and the front end thereof is fixed with the valve core 3; the valve core 3 and the first sealing ring 4 are assembled on the hydrogen outlet 30, and are used to open or close the hydrogen outlet 30.

[0039] In order to accurately detect the temperature of the hydrogen outlet 30 , the temperature sensor 2 is installed at a position of the front valve body 1 close to the hydrogen outlet 30 .

[0040] The front valve assembly has a rear port that can enter compressed hydrogen. The compressed hydrogen to be transported must have a pressure sufficient to push the valve core 3 away from the hydrogen outlet 30 to allow the hydrogen outlet 30 to be conductive. Therefore, damping components such as the spring 7 must be carefully selected and the elastic coefficient must not be too large.

[0041] The rear valve assembly includes a rear valve body, a servo electric cylinder 24, a first piston 14, a second piston 22 and a second valve stem 13. Figure 1 As shown, the second valve stem 13 is a high temperature resistant brittle plastic stem, which is the most easily broken component among all hard components and is relatively a wearing part.

[0042] The first piston 14, the second piston 22, the second valve stem 13 and the first valve stem 6 are arranged coaxially; the front end of the second valve stem 13 is detachably fixed to the stopper 29, and the rear end is fixed to the first piston 14; the rear valve body is detachably connected to the front valve body 1; a piston sliding chamber is provided in the rear valve body, and the first piston 14 and the second piston 22 are slidably assembled in the piston sliding chamber; the part of the piston sliding chamber between the first piston 14 and the second piston 22 serves as an inert gas chamber 15 and is filled with inert gas; the part of the piston sliding chamber in front of the first piston 14 serves as a hydrogen circulation chamber 12 and is connected to the hydrogen outlet 30 of the front valve body 1; the rear valve body is provided with a hydrogen inlet 11 located in front of the first piston 14 and leading to the hydrogen circulation chamber 12; the inner wall of the hydrogen circulation chamber 12 is provided with a piston limiter 26 located behind the hydrogen inlet 11, which is used to make the first piston 14 always located behind the hydrogen inlet 11; the piston connecting rod 23 of the servo electric cylinder 24 is coaxially connected to the rear of the second piston 22.

[0043] The controllable one-way valve assembly of the present invention is a combined structure including a front valve assembly and a rear valve assembly, and has two usage modes:

[0044] The first one:

[0045] After disassembling the connection structure between the rear valve body and the front valve body 1, the front valve assembly is used alone, and the method of use is to use the rear port of the front valve body 1 as the inlet of compressed hydrogen and directly connect it to the hydrogen exhaust system, so that under the impact of hydrogen, the valve core 3 can be pushed open from the hydrogen outlet 30. Since this method lacks safety protection, it can mainly be used inside each compression stage, but not at the outlet of the compression stage.

[0046] Second type:

[0047] according to Figure 1 The structure shown keeps the rear valve body and the front valve body 1 assembled together, and at this time has an explosion-proof buffer structure and a valve core 3 opening damping adjustment control structure, which is applied to the outlet of each compression stage.

[0048] The hydrogen inlet 11 is connected to the hydrogen outlet 30 of the previous compression stage, and the hydrogen outlet 30 is connected to the hydrogen inlet of the next compression stage.

[0049] When using, Figure 1 The servo electric cylinder 24 and the rear valve body shown need to be fixed. There are many ways to fix them, such as fixing them through auxiliary frame support, directly fixing them to the compressor body, or fixing them to the environmental wall. Figure 1 How to fix it is not shown.

[0050] The automatic adjustment method of valve opening resistance is as follows:

[0051] The temperature sensor 2 feeds back the temperature signal to the control module in real time.

[0052] The control module outputs corresponding control instructions to the servo electric cylinder 24 according to the temperature signal. The greater the temperature data fed back to the control module by the temperature sensor 2, the greater the amplitude of the servo electric cylinder 24 pulling the piston connecting rod 23 backward, so that the inert gas dynamically maintains a suitable thrust to the right on the first piston 14;

[0053] When the detected temperature just exceeds 135°C, the amplitude of the pull-back reaches the maximum value when the second valve stem 13 is not damaged. At this time, the pressure of the compressed hydrogen is not enough to overcome the resistance of the spring 7, and the valve core 3 is pushed open, and the hydrogen outlet 30 remains closed, and no hydrogen is delivered to the next compression stage;

[0054] On the basis of this state, if the hydrogen temperature rises abnormally rapidly, the gas pressure in the hydrogen flow chamber 12 will also rise rapidly. Since the second valve stem 13 is a high-temperature resistant brittle plastic rod, it will break before the explosion, and then the first piston 14 will move backward. Under the buffering effect of the inert gas, the risk of explosion is reduced, and then a real explosion-proof effect is achieved. Moreover, since the valve assembly is a modular structure, it is easy to replace the new second valve stem 13.

[0055] The above control method can be realized by executing a program written into the control module.

[0056] In the present invention, the electrical control schematic diagram is as follows Figure 4 As shown, since the electrical connection relationship between the servo electric cylinder 24, the control module and the temperature sensor 2 is the prior art, no more detailed description is given.

[0057] In an optional embodiment of the present invention, the bracket 5 is arranged vertically and the center is vertically fixed to the circular structure of the spring sleeve shaft 8, which has three fan-shaped holes that connect the front and rear parts of the inner cavity of the front valve body 1.

[0058] In an optional embodiment of the present invention, the stopper 29 is fixedly connected to the rear end of the first valve stem 6 by a countersunk screw 27 ; the front end of the second valve stem 13 is fixed to the stopper 29 by two connecting screws 28 .

[0059] In an optional embodiment of the present invention, the hydrogen outlet 30 is a bell mouth facing forward, and the first sealing ring 4 is fixed to the valve core 3; the first sealing ring 4 can seal the assembly gap of the hydrogen outlet 30 of the valve core 3.

[0060] In an optional embodiment of the present invention, the temperature sensing element of the temperature sensor 2 is a circular ring structure sleeved on the front end of the front valve body 1 .

[0061] In this embodiment, the circular ring structure is convenient to be mounted on and fit closely to the front valve body 1 .

[0062] In an optional embodiment of the present invention, the rear valve body includes a first valve body 10 and a second valve body 25; the front end of the first valve body 10 is threaded and sealed to the front valve body 1, and the rear end is sealed to the front end of the second valve body 25 through a flange assembly; the inner cavities of the first valve body 10 and the second valve body 25 constitute a piston sliding cavity; the first piston 14 is slidably assembled on the first valve body 10, and the second piston 22 is slidably assembled on the second valve body 25.

[0063] The first valve body 10 and the second valve body 25 are easy to disassemble, and then the internal structural parts, such as the piston, are easy to install.

[0064] In this embodiment, a gas filling hole 21 equipped with a sealing plug 20 is opened on the side wall of the second valve body 25 , and the gas filling hole 21 leads to the inert gas chamber 15 .

[0065] After the valve assembly is assembled, as the structural parts age, the inert gas may leak. At this time, the inert gas can be added to the interior through the gas adding hole 21 .

[0066] When the pressure in the inert gas chamber 15 is large enough, it is possible to push open the sealing plug 20 and then discharge the inert gas, which can further play a role in buffering and explosion prevention.

[0067] In this embodiment, a second sealing ring 9 is provided between the front end of the first valve body 10 and the rear end of the front valve body 1 .

[0068] In this embodiment, the flange assembly includes a first flange member 16 fixed to the first valve body 10, a second flange member 17 fixed to the second valve body 25, a sealing gasket 19 clamped between the first flange member 16 and the second flange member 17, and a bolt 18 that fixes the first flange member 16 and the second flange member 17.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A controllable one-way valve assembly for hydrogen delivery, characterized in that: including a front valve assembly and a rear valve assembly; The front valve assembly comprises a front valve body (1), a valve core (3), a first valve stem (6), a spring (7), a temperature sensor (2), a first sealing ring (4) and a stopper (29); The front end of the front valve body (1) is a hydrogen outlet (30), and a spring sleeve shaft (8) is fixed to the central axis through a bracket (5); the spring (7) is sleeved on the spring sleeve shaft (8), and the front end elastically abuts against the bracket (5), and the rear end elastically abuts against the stopper (29); the stopper (29) is detachably fixed to the rear end of the first valve stem (6); the first valve stem (6) is slidably sleeved and penetrates the spring sleeve shaft (8), and the front end of the first valve stem (6) fixes the valve core (3); the valve core (3) and the first sealing ring (4) are assembled on the hydrogen outlet (30) and are used to open or close the hydrogen outlet (30); the temperature sensor (2) is installed at a position of the front valve body (1) close to the hydrogen outlet (30); The rear valve assembly comprises a rear valve body, a servo electric cylinder (24), a first piston (14), a second piston (22) and a second valve stem (13), wherein the second valve stem (13) is a high temperature resistant brittle plastic stem; The first piston (14), the second piston (22), the second valve stem (13) and the first valve stem (6) are coaxially arranged; the front end of the second valve stem (13) is detachably fixed to the stopper (29), and the rear end is fixed to the first piston (14); the rear valve body is detachably connected to the front valve body (1); a piston sliding chamber is provided in the rear valve body, and the first piston (14) and the second piston (22) are slidably assembled in the piston sliding chamber; the portion of the piston sliding chamber between the first piston (14) and the second piston (22) serves as an inert gas chamber (15) and is filled with an inert gas; the piston sliding chamber is provided with a plurality of pistons, each of which ... The portion of the dynamic chamber in front of the first piston (14) serves as a hydrogen circulation chamber (12) and is connected to the hydrogen outlet (30) of the front valve body (1); the rear valve body is provided with a hydrogen inlet (11) located in front of the first piston (14) and leading to the hydrogen circulation chamber (12); the inner wall of the hydrogen circulation chamber (12) is provided with a piston stopper (26) located behind the hydrogen inlet (11) for ensuring that the first piston (14) is always located behind the hydrogen inlet (11); the piston connecting rod (23) of the servo electric cylinder (24) is coaxially connected to the rear of the second piston (22).

2. The controllable one-way valve assembly for hydrogen delivery according to claim 1, characterized in that: The bracket (5) is arranged vertically and is fixed at its center to a circular structure of the spring sleeve shaft (8), and has three fan-shaped holes, which connect the front and rear parts of the inner cavity of the front valve body (1).

3. The controllable one-way valve assembly for hydrogen delivery according to claim 1, characterized in that: The stopper (29) is fixedly connected to the rear end of the first valve stem (6) via a countersunk screw (27); the front end of the second valve stem (13) is fixed to the stopper (29) via two connecting screws (28).

4. The controllable one-way valve assembly for hydrogen delivery according to claim 1, characterized in that: The hydrogen outlet (30) is a bell mouth facing forward, and the first sealing ring (4) is fixed to the valve core (3); the first sealing ring (4) can seal the assembly gap of the hydrogen outlet (30) of the valve core (3).

5. The controllable one-way valve assembly for hydrogen delivery according to claim 1, characterized in that: The temperature sensing element of the temperature sensor (2) is a circular ring structure sleeved on the front end of the front valve body (1).

6. The controllable one-way valve assembly for hydrogen delivery according to claim 1, characterized in that: The rear valve body comprises a first valve body (10) and a second valve body (25); the front end of the first valve body (10) is threadedly sealed to the front valve body (1), and the rear end is sealed to the front end of the second valve body (25) through a flange assembly; the inner cavities of the first valve body (10) and the second valve body (25) constitute the piston sliding cavity; the first piston (14) is slidably assembled on the first valve body (10), and the second piston (22) is slidably assembled on the second valve body (25).

7. The controllable one-way valve assembly for hydrogen delivery according to claim 6, characterized in that: The side wall of the second valve body (25) is provided with a gas filling hole (21) equipped with a sealing plug (20), and the gas filling hole (21) leads to the inert gas chamber (15).

8. The controllable one-way valve assembly for hydrogen delivery according to claim 6, characterized in that: A second sealing ring (9) is provided between the front end of the first valve body (10) and the rear end of the front valve body (1).

9. The controllable one-way valve assembly for hydrogen delivery according to claim 6, characterized in that: The flange assembly comprises a first flange member (16) fixed to the first valve body (10), a second flange member (17) fixed to the second valve body (25), a sealing gasket (19) clamped between the first flange member (16) and the second flange member (17), and bolts (18) for fixing the first flange member (16) and the second flange member (17).

10. The controllable one-way valve assembly for hydrogen delivery according to claim 1, characterized in that: The controllable one-way valve assembly also includes a control module, through which a temperature signal from the temperature sensor (2) can be obtained, and a control instruction for driving the piston connecting rod (23) to extend and retract can be output to the servo electric cylinder (24).

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