CN115199795A - Controllable one-way valve assembly for hydrogen gas delivery - Google Patents

Abstract

The invention discloses a controllable one-way valve assembly for hydrogen transmission, which relates to the technical field of gas intelligent conveying 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 A 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 High temperature brittle plastic rod. The functional structure of the invention has good variability and wide application range; it is easy to realize the dynamic control of the force required when the valve core is pushed open, and can play the role of adjusting the hydrogen outlet temperature of the valve to a certain extent; When the temperature rises sharply, the air pressure in the hydrogen flow chamber also rises sharply. Since the second valve rod is a high-temperature brittle plastic rod, it has broken before reaching the explosion, and then the first piston moves backwards, in the buffer of the inert gas. As a result, the risk of explosion is reduced.

Description

A controllable one-way valve assembly for hydrogen delivery

technical field

The invention relates to the technical field of gas intelligent conveying equipment, in particular to a controllable one-way valve assembly for hydrogen conveying.

Background technique

Hydrogen often requires multi-stage compression to achieve a large pressure ratio. Hydrogen has a large slip number. 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 not exceed 135 °C. After that, the hydrogen is transported to the next-stage compression chamber to ensure stable delivery. The lower gas outlet temperature is also beneficial to the life and reliability of the gas valve, and also reduces the penetration of hydrogen into the material. One-way valve is a common component in the process of hydrogen compression and transportation. Its working principle is the same as that of hydraulic one-way valve. Compressed hydrogen enters, and overcomes the spring force and friction to open the valve port of the one-way valve. The one-way valve currently used for hydrogen delivery has the following defects:

1) The variability of the functional structure is poor, and the structure cannot be improved on-site according to the actual situation, and the application scope is small;

2) Lack of explosion-proof structure, it is often necessary to completely rely on the external explosion-proof structure to realize the explosion-proof function of hydrogen transmission, and its own function is relatively simple.

SUMMARY OF THE INVENTION

The present invention is to provide a controllable one-way valve assembly for hydrogen delivery, which can alleviate the above problems.

In order to alleviate the above-mentioned problems, the technical scheme adopted by the present invention is as follows:

The invention provides a controllable one-way valve assembly for hydrogen transmission, 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 front end of the front valve body is a hydrogen outlet, and a spring sleeve shaft is fixed at the center shaft position through a bracket; the spring is sleeved on the spring sleeve shaft, and the front end elastically contacts the bracket, and the rear end elastically contacts the bracket. the stopper; the stopper is detachably fixed to the rear end of the first valve rod; the first valve rod is slidably sleeved and penetrated through the spring sleeve shaft, and the front end of the stopper is fixed to the valve core; The valve core and the first sealing ring are assembled on the hydrogen outlet for opening or closing the hydrogen outlet; the temperature sensor is installed at the position of the front valve body close to the hydrogen outlet;

The rear valve assembly includes a rear valve body, a servo electric cylinder, a first piston, a second piston and a second valve rod, and the second valve rod is a high temperature resistant brittle plastic rod;

The first piston, the second piston, the second valve rod and the first valve rod are arranged coaxially; the front end of the second valve rod 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; the rear valve body is provided with a piston sliding cavity, and the first piston and the second piston are slidably assembled in the piston sliding cavity; The part between the first piston and the second piston is used as an inert gas chamber and is filled with inert gas; the part of the piston sliding chamber in front of the first piston is used as a hydrogen flow chamber, and is connected with the front valve body. The hydrogen outlet is connected; the rear valve body is provided with a hydrogen inlet located in front of the first piston and leading to the hydrogen flow cavity; the inner wall of the hydrogen flow cavity is provided with a piston limiter located behind the hydrogen inlet, 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.

In a preferred embodiment of the present invention, the bracket is a circular structure arranged vertically, and the center position is vertically fixed to the spring sleeve shaft, and three fan-shaped holes are left. The front and rear parts of the inner cavity of the valve body communicate with each other.

In a preferred embodiment of the present invention, the block is fixedly connected to the rear end of the first valve stem through a countersunk screw; the front end of the second valve stem is fixed to the second valve stem through two connecting screws Stoppers.

In a preferred embodiment of the present invention, the hydrogen outlet is a bell mouth facing forward, and the first sealing ring is fastened to the valve core; the valve core can be fixed by the first sealing ring The assembly gap of the hydrogen outlet is sealed.

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

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 threadedly connected to the front valve body, and the rear end passes through a flange assembly It is sealed and connected to the front end of the second valve body; the inner cavity of the first valve body and the second valve body constitutes the piston sliding cavity; the first piston is slidably assembled on the first valve body, the The second piston is slidably assembled on the second valve body.

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.

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.

In a preferred embodiment of the present invention, the flange assembly includes a first flange member fixed to the first valve body, a second flange member fixed to the second valve body, and a flange member fixed to the second valve body. The gasket between the first flange piece and the second flange piece, and the bolts that fixedly connect the first flange piece and the second flange piece.

In a preferred embodiment of the present invention, the controllable one-way valve assembly further includes a control module, through which the temperature signal from the temperature sensor can be obtained, and the driving force can be output to the servo electric cylinder. The control command for the telescopic action of the piston connecting rod.

Compared with the prior art, the beneficial effects of the present invention are:

The controllable one-way valve assembly of the present invention is a front and rear combined structure, and the front valve assembly can be selected to be used alone in a general environment, or a structure in which the front and rear valve assemblies are assembled together for use at the outlet of the hydrogen compression structure at all levels can be selected. , the functional structure has good variability, and the application range is large;

When the controllable one-way valve assembly of the present invention has a front and rear combined structure, it is easy to realize the dynamic control force required when the valve core is pushed open, and can play a role in adjusting the hydrogen outlet temperature of the valve to a certain extent;

When the controllable one-way valve assembly of the present invention is a front and rear combined structure, it has the characteristics of explosion-proof. If the hydrogen gas is abnormally heated up, the air pressure in the hydrogen gas flow chamber will also increase rapidly. Because the second valve rod is a high temperature resistant brittle plastic rod , before reaching the explosion, it has been broken, and then the first piston moves backwards, under the buffering effect of the inert gas, the risk of explosion is reduced, and then the explosion-proof effect is really played, and because the valve assembly is a combined structure , so it is easy to replace a new second valve stem.

In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following specific embodiments of the present invention are given and described in detail in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the sectional structure schematic diagram of the controllable one-way valve assembly of the present invention;

Fig. 2 is the partial enlarged view of A place in Fig. 1;

Fig. 3 is the structural representation of the front valve assembly of the present invention;

4 is a schematic block diagram of the electrical control of the controllable one-way valve assembly of the present invention;

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 shaft, 9- first Two sealing rings, 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 piece, 18-Bolt, 19-Gasket, 20-Sealing plug, 21-Air filling hole, 22-Second piston, 23-Piston connecting rod, 24-Servo electric cylinder, 25-Second valve body , 26-limit piece, 27- countersunk head screw, 28-connecting screw, 29-stop, 30-hydrogen outlet.

Detailed ways

In order to make the purposes, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in use, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Referring to FIGS. 1 to 4 , the present invention provides a controllable one-way valve assembly for hydrogen delivery, including a front valve assembly, a rear valve assembly and a control module.

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 , as shown in FIGS. 1 and 3 .

The front end of the front valve body 1 is the hydrogen outlet 30, and the central axis is fixed with a spring sleeve shaft 8 through the bracket 5; the spring 7 is sleeved on the spring sleeve shaft 8, and the front end elastically contacts the bracket 5, and the rear end elastically contacts the stopper 29; the stopper 29 is detachably fixed to the rear end of the first valve rod 6; the first valve rod 6 is slidably sleeved and penetrated through the spring sleeve shaft 8, the front end of which is fixed with the valve core 3; the valve core 3 and the first sealing ring 4 is assembled on the hydrogen outlet 30 for opening or closing the hydrogen outlet 30.

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

The front valve assembly, its rear port can enter the compressed hydrogen gas, and the compressed hydrogen gas to be delivered needs to ensure that its air pressure is enough to push the valve core 3 away from the hydrogen outlet 30, so that the hydrogen outlet 30 is connected, so damping components such as the spring 7, Careful selection should be made, and the elastic coefficient should not be too large.

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 rod 13. As shown in FIG. 1, the second valve rod 13 is a high temperature resistant brittle plastic rod, which is so rigid. The parts that are most likely to be pulled off are the wearing parts, relatively speaking.

The first piston 14, the second piston 22, the second valve rod 13 and the first valve rod 6 are arranged coaxially; the front end of the second valve rod 13 is detachably fixed to the stopper 29, and the rear end is fixed to the first piston 14; the rear valve The body is detachably connected to the front valve body 1; the rear valve body is provided with a piston sliding cavity, and the first piston 14 and the second piston 22 are slidably assembled in the piston sliding cavity; the piston sliding cavity is between the first piston 14 and the second piston 22 The part of the piston sliding chamber in front of the first piston 14 is used as the hydrogen flow chamber 12 and communicated with the hydrogen outlet 30 of the front valve body 1; A front of the piston 14 leads to the hydrogen inlet 11 of the hydrogen flow chamber 12; the inner wall of the hydrogen flow chamber 12 is provided with a piston stopper 26 located behind the hydrogen inlet 11, so that the first piston 14 is always positioned 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 .

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 there are two usage modes:

The first:

After disassembling the connection structure between the rear valve body and the front valve body 1, the front valve assembly is used alone. 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 discharge system. In this way, 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 be mainly used inside each compression stage, rather than at the outlet of the compression stage.

The second:

According to the structure shown in FIG. 1 , the rear valve body and the front valve body 1 are kept assembled together. At this time, there is an explosion-proof buffer structure, and the valve core 3 opens a damping adjustment control structure, which is applied to the outlet of each compression stage.

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.

When in use, the servo electric cylinder 24 and the rear valve body shown in FIG. 1 need to be fixed, because there are many ways of fixing them, such as supporting and fixing through an auxiliary frame, directly fixing to the body of the compressor, or fixing to Ambient walls, so how it is fixed is not shown in Figure 1.

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

The temperature signal is fed back to the control module in real time through the temperature sensor 2 .

The control module outputs corresponding control commands 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 backwards, which makes the inert gas dynamic. maintains a suitable thrust to the right of the first piston 14;

When the detected temperature just exceeds 135°C, the pullback amplitude reaches the maximum value when the second valve stem 13 is not damaged. At this time, the gas pressure of the compressed hydrogen gas is not enough to overcome the resistance of the spring 7, and the valve core 3 is pushed open. The hydrogen outlet 30 remains closed and does not deliver hydrogen to the next compression stage;

On the basis of this state, if the hydrogen gas heats up abnormally and sharply, the air pressure in the hydrogen gas flow chamber 12 also increases sharply. Since the second valve rod 13 is a high temperature resistant brittle plastic rod, it has broken before reaching the explosion, and then The first piston 14 moves backward, under the buffering effect of the inert gas, the risk of explosion is reduced, and then the explosion-proof effect is truly achieved, and because the valve assembly is a combined structure, it is convenient to replace the new second valve stem 13 .

The above control method can be realized by executing the program written in the control module.

In the present invention, the schematic diagram of electrical control is shown in FIG. 4 . Since the electrical connection relationship between the servo electric cylinder 24 , the control module and the temperature sensor 2 is in the prior art, no more detailed description is given.

In an optional embodiment of the present invention, the bracket 5 is a circular structure arranged vertically, and the center position is vertically fixed to the spring sleeve shaft 8, and three fan-shaped holes are left. The fan-shaped holes connect the inner cavity of the front valve body 1 front and rear connections.

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

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 fastened to the valve core 3; Assembly gap seal.

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

In this embodiment, the ring structure is convenient to be assembled and attached to the front valve body 1 .

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 threadedly connected to the front valve body 1, and the rear end is sealedly connected through a flange assembly at the front end of the second valve body 25; the inner cavity 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 10. valve body 25.

The disassembly between the first valve body 10 and the second valve body 25 is convenient, and then the installation of internal structural parts, such as a piston, is facilitated.

In this embodiment, 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 .

After the valve assembly is assembled, the inert gas may leak with the aging of the structural parts. At this time, the inert gas can be replenished from the air filling hole 21 to the inside.

When the pressure in the inert gas chamber 15 is large enough, it is possible to push the sealing plug 20 open, and then discharge the inert gas, which can further play the role of buffering and explosion-proof.

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 .

In this embodiment, the flange assembly includes a first flange member 16 fixed on the first valve body 10 , a second flange member 17 fixed on the second valve body 25 , a first flange member 16 and a second flange member 17 fixed on the second valve body 25 . The gasket 19 between the two flange parts 17 , and the bolts 18 for fixedly connecting the first flange part 16 and the second flange part 17 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A controllable one-way valve assembly for hydrogen gas delivery, comprising 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 rod (6), a spring (7), a temperature sensor (2), a first sealing ring (4) and a stop block (29);

the front end of the front valve body (1) is a hydrogen outlet (30), and a spring sleeve shaft (8) is fixed at the middle shaft position through a support (5); the spring (7) is sleeved on the spring sleeve shaft (8), the front end of the spring is elastically abutted against the bracket (5), and the rear end of the spring is elastically abutted against the stop block (29); the stop block (29) is detachably fixed at the rear end of the first valve rod (6); the first valve rod (6) is sleeved and penetrated through the spring sleeve shaft (8) in a sliding manner, and the front end of the first valve rod 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 used for opening or closing the hydrogen outlet (30); the temperature sensor (2) is arranged at the position, close to the hydrogen outlet (30), of the front valve body (1);

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 rod (13), and the second valve rod (13) is a high-temperature-resistant brittle plastic rod;

the first piston (14), the second piston (22), the second valve rod (13) and the first valve rod (6) are coaxially arranged; the front end of the second valve rod (13) is detachably fixed on the stop block (29), and the rear end of the second valve rod is fixed on the first piston (14); the rear valve body is detachably connected to the front valve body (1); a piston sliding cavity is arranged in the rear valve body, and the first piston (14) and the second piston (22) are assembled in the piston sliding cavity in a sliding manner; the part of the piston sliding cavity between the first piston (14) and the second piston (22) is used as an inert gas cavity (15) and is filled with inert gas; the part of the piston sliding cavity in front of the first piston (14) is used as a hydrogen gas circulation cavity (12) and is communicated with a hydrogen gas outlet (30) of the front valve body (1); the rear valve body is provided with a hydrogen inlet (11) which is positioned in front of the first piston (14) and leads to the hydrogen circulation cavity (12); a piston limiting piece (26) which is positioned behind the hydrogen inlet (11) is arranged on the inner wall of the hydrogen circulation cavity (12) and is used for enabling the first piston (14) to be positioned behind the hydrogen inlet (11) all the time; and a piston connecting rod (23) of the servo electric cylinder (24) is coaxially connected to the rear part of the second piston (22).

2. The controllable one-way valve assembly for hydrogen delivery according to claim 1, wherein the support (5) is a circular structure vertically arranged and fixed at the center position to the spring sleeve shaft (8), and three fan-shaped holes are reserved, and the fan-shaped holes communicate the front part and the rear part of the inner cavity of the front valve body (1).

3. The controllable one-way valve assembly for hydrogen delivery according to claim 1, wherein 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 rod (13) is fixed on the stop block (29) through two connecting screws (28).

4. The controllable check valve assembly for hydrogen delivery according to claim 1, wherein the hydrogen outlet (30) is a forward flare, and the first sealing ring (4) is clamped on 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 check valve assembly for hydrogen delivery according to claim 1, wherein 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, wherein 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 in threaded sealing connection with the front valve body (1), and the rear end of the first valve body is in sealing connection with 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) form the piston sliding cavity; the first piston (14) is slidably mounted to the first valve body (10) and the second piston (22) is slidably mounted to the second valve body (25).

7. The controllable one-way valve assembly for hydrogen delivery according to claim 6, wherein the second valve body (25) has a gas filling hole (21) provided with a sealing plug (20) at a side wall thereof, and the gas filling hole (21) opens into the inert gas chamber (15).

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

9. The controllable check valve assembly for hydrogen gas delivery according to claim 6, wherein 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 gasket (19) clamped between the first flange member (16) and the second flange member (17), and a bolt (18) fixedly connecting the first flange member (16) and the second flange member (17).

10. A controllable one-way valve assembly for hydrogen delivery according to claim 1, further comprising a control module, by means of which a temperature signal from the temperature sensor (2) can be obtained and control commands to drive the piston connecting rod (23) to extend and retract are output to the servo-electric cylinder (24).

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