A non-return type quick shut-off hydrogen injection valve

Abstract

The present invention discloses a check-type quick shut-off hydrogen injection valve, which belongs to the technical field of industrial valves, and comprises a valve body 1, a check valve, a valve body 2, a main valve stem assembly, a valve cover, a sealing connection assembly and a driving device. The valve body 1, the valve body 2, the valve cover, the sealing connection assembly and the driving device are connected in sequence, and a main valve cavity is formed between the valve body 2 and the valve cover. A main valve stem assembly for controlling the on-off of a medium flow path is arranged in the main valve cavity, and a check valve for preventing the medium from flowing back is arranged at the connection between the valve body 1 and the valve body 2. The present invention adopts an integrated design of a check valve disc, a stop valve main valve disc and a flow channel coaxial line, and has the advantages of a simple structure, a stop valve can play a role in isolating liquid metal sodium or hydrogen medium in the flow channel, and a check valve can prevent liquid metal sodium medium from flowing back to the valve cavity, the valve body 1 is connected to a hydrogen injection pipeline, and an inlet pipe is connected to a hydrogen gas source pipeline. The valve stem is driven by a driving device to quickly open or close the valve, saving installation space and facilitating operation.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial valves, and in particular relates to a non-return type quick shut-off hydrogen injection valve, which is a non-return type quick shut-off hydrogen injection valve with a quick-closing non-return function and capable of realizing medium injection. Background Art

[0002] The hydrogen injection valve is a key device in the sodium-water reaction research test system, and together with the main circuit, purification circuit, and argon circuit, it forms the system. The existing hydrogen injection valve adopts a large valve seat diameter design, which has achieved the removal of solid sodium after condensation. There is no handwheel designed as a driving part, and an adjustable wrench is used as a driving part.

[0003] When the above-mentioned adjustable wrench is used as the driving part, the valve closing speed is very slow, and the valve stem nut needs to be turned 5 times, which is inconvenient for on-site operation and requires a special adjustable wrench as a backup; the large valve seat diameter design leads to an excessively large flow area of ​​the valve seat. After the hydrogen injection operation is completed, the valve cavity pressure drops, resulting in a large amount of liquid metallic sodium backflow in the pipeline system. The wrench closing speed is slow, further increasing the large amount of liquid metallic sodium backflow in the pipeline system.

[0004] After the hydrogen ends, the liquid sodium metal condenses into a solid state. When the valve is opened next time, the solid sodium will damage the bellows assembly and cause blockage of the flow channel. Since sodium metal is a very active metal, once the bellows assembly is damaged, it will leak and easily burn, causing a sodium fire accident, which seriously affects the personal and equipment safety of the test site. Summary of the invention

[0005] In view of this, the present invention provides a non-return type quick shut-off hydrogen injection valve to solve the deficiencies of the prior art. The hydrogen injection valve can timely and effectively prevent the backflow of liquid metallic sodium in the pipeline system, and can timely isolate the pipeline system from the hydrogen gas source system, thereby facilitating on-site operation.

[0006] The technical solution of the present invention is:

[0007] A non-return type quick shut-off hydrogen injection valve, comprising a valve body 1, a non-return valve, a valve body 2, a main valve stem assembly, a valve cover, a sealing connection assembly and a driving device;

[0008] The valve body 1, valve body 2, valve cover, sealing connection assembly and driving device are connected in sequence, a main valve cavity is formed between the valve body 2 and the valve cover, a main valve stem assembly for controlling the on and off of the medium flow path is arranged in the main valve cavity, and a check valve is arranged at the connection between the valve body 1 and the valve body 2 to prevent the medium from flowing back;

[0009] The main valve stem assembly includes a main valve disc, a valve stem and a bellows assembly, one end of the valve stem is connected to the main valve disc, the bellows assembly is sleeved on the middle section of the valve stem, one end of the bellows assembly is fixed to the middle section of the valve stem, and the other end of the bellows assembly is fixed to the valve cover;

[0010] The sealing connection assembly includes a stem nut, a bearing, a bearing cover and an anti-rotation cover; the stem nut includes a cylinder, an annular body and a flange coaxially fixedly connected in sequence, and a connecting structure is provided at one end of the cylinder close to the annular body; the anti-rotation cover is fixedly mounted on the end of the valve stem away from the main valve disc and the anti-rotation cover is fixed to the valve cover, the stem nut is mounted on the outside of the anti-rotation cover, the connecting structure on the stem nut is connected to the end of the valve stem away from the main valve disc, and the end of the stem nut away from the valve body is connected to a driving device; the bearing cover is mounted on the annular body of the stem nut, and the bearing cover is fixedly connected to the valve cover, a cavity is formed between the bearing cover and the valve cover, a flange of the stem nut is arranged in the cavity, and bearings are respectively arranged on both sides of the flange.

[0011] Preferably, the check valve comprises a check valve cavity, a check valve back pressure spring and a check valve disc, the check valve cavity is opened at the connection between valve body one and valve body two, a check valve disc is arranged in the check valve cavity, the check valve cavity and the check valve disc are clearance-matched, the check valve disc can block the medium flow path when one end close to valve body two is pressed against the check valve cavity, and the end of the check valve disc facing away from valve body two is fitted with a check valve back pressure spring.

[0012] Preferably, the second middle section of the valve body is provided with an inlet pipe, and the inlet pipe is communicated with the main valve cavity.

[0013] Preferably, a T-shaped head is provided at one end of the valve stem connected to the main valve disc, a T-shaped slot is provided on the main valve disc, and the T-shaped slot is matched and connected with the T-shaped head.

[0014] Preferably, the driving device is a hand wheel.

[0015] Preferably, the driving device comprises a motor, the output shaft of the motor is connected with a sleeve, and the sleeve is coaxially fixedly connected to an end of the valve stem nut facing away from the valve body 2.

[0016] Preferably, valve body 1, valve body 2 and valve cover are coaxial.

[0017] Compared with the prior art, the invention discloses a check-type quick-shutoff hydrogen injection valve, which adopts an integrated design of a check valve disc, a stop valve main valve disc and a flow channel coaxial line. The advantage is that the structure is simple, the stop valve can isolate the liquid metal sodium or hydrogen medium in the flow channel, the check valve can prevent the liquid metal sodium medium from flowing back into the valve cavity, the valve body is connected to the hydrogen injection pipeline, the inlet pipe is connected to the hydrogen gas source pipeline, and the valve stem is driven by a hand wheel to quickly open or close the valve, which saves installation space and is convenient to operate. It has strong practicality and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention in a closed state;

[0019] Figure 2 It is a structural schematic diagram of the hydrogen injection state of the present invention;

[0020] Figure 3 This is a structural schematic diagram of the hydrogen injection end state of the present invention.

[0021] Reference numerals:

[0022] 1. Valve body 1; 2. Check valve back pressure spring; 3. Check valve disc; 4. Valve body 2; 5. Main valve disc; 6. Valve stem; 7. Bellows assembly; 8. Inlet connecting pipe; 9. Valve cover; 10. Bearing; 11. Valve stem nut; 12. Anti-rotation cover; 13. Handwheel; 14. Key 1; 15. Key 2; 16. Screw; 17. Bearing cover. DETAILED DESCRIPTION

[0023] The present invention provides a non-return type rapid shut-off hydrogen injection valve, Figures 1 to 3 The present invention is described with reference to the structural schematic diagram of FIG.

[0024] Example 1

[0025] like Figures 1 to 3 As shown, a non-return type quick shut-off hydrogen injection valve comprises a valve body 1, a non-return valve, a valve body 2 4, a main valve stem assembly, a valve cover 9, a sealing connection assembly and a driving device;

[0026] The valve body 1 , the valve body 2 4 and the valve cover 9 are circular in shape and are coaxially arranged, and the flow passages on the valve body 1 and the valve body 2 4 are coaxially arranged.

[0027] The valve body 1, the valve body 2 4, the valve cover 9, the sealing connection assembly and the driving device are connected in sequence, and a main valve cavity is formed between the valve body 2 4 and the valve cover 9. A main valve stem assembly for controlling the on-off of the medium flow path is arranged in the main valve cavity, and a check valve for preventing the medium from flowing back is arranged at the connection between the valve body 1 and the valve body 2 4.

[0028] The main valve stem assembly includes a main valve disc 5, a valve stem 6 and a bellows assembly 7. One end of the valve stem 6 is connected to the main valve disc 5. The bellows assembly 7 is sleeved on the middle section of the valve stem 6. One end of the bellows assembly 7 is fixed to the middle section of the valve stem 6, and the other end of the bellows assembly 7 is fixed to the valve cover 9.

[0029] The sealing connection assembly includes a stem nut 11, a bearing 10, a bearing pressure cover 17 and an anti-rotation cover 12; the stem nut 11 includes a cylinder, an annular body and a flange which are coaxially fixedly connected in sequence, and a connecting structure is arranged at one end of the cylinder close to the annular body; the anti-rotation cover 12 is fitted and fixed on the end of the valve stem 6 away from the main valve disc 5 and the anti-rotation cover 12 is fixed to the valve cover 9, the stem nut 11 is fitted on the outside of the anti-rotation cover 12, the connecting structure on the stem nut 11 is connected to the end of the valve stem 6 away from the main valve disc 5, and the end of the stem nut 11 away from the valve body 4 is connected to the driving device; the bearing pressure cover 17 is fitted on the annular body of the stem nut 11, the bearing pressure cover 17 is fixedly connected to the valve cover 9, a cavity is formed between the bearing pressure cover 17 and the valve cover 9, a flange of the stem nut 11 is arranged in the cavity, and bearings 10 are arranged on both sides of the flange respectively.

[0030] Furthermore, the check valve includes a check valve cavity, a check valve back pressure spring 2 and a check valve disc 3. The check valve cavity is opened at the connection between valve body 1 and valve body 2 4. A check valve disc 3 is arranged in the check valve cavity. The check valve cavity and the check valve disc 3 are clearance-matched. When one end of the check valve disc 3 close to the valve body 2 4 is pressed against the check valve cavity, the medium flow path can be blocked. The end of the check valve disc 3 away from the valve body 2 4 is provided with a check valve back pressure spring 2.

[0031] Furthermore, an inlet pipe 8 is provided in the middle section of the valve body 4, and the inlet pipe 8 is communicated with the main valve chamber.

[0032] Furthermore, a T-shaped head is provided at one end of the valve stem 6 connected to the main valve flap 5 , a T-shaped slot is provided on the main valve flap 5 , and the T-shaped slot is matched and connected with the T-shaped head.

[0033] Specifically, the driving device is a hand wheel 13, which is used to realize manual control of the entire device.

[0034] The structure of a check valve with quick shut-off is described in conjunction with the accompanying drawings. The structure includes a valve body 1, a check valve back pressure spring 2, a check valve disc 3, a valve body 2 4, a main valve disc 5, a valve stem 6, a bellows assembly 7, an inlet pipe 8, a valve cover 9, a bearing 10, a valve stem nut 11, an anti-rotation cover 12, a handwheel 13, a key 14, a key 2 15, a screw 16 and a bearing cover 17.

[0035] The front end of the valve body 2 4 is connected to the valve body 1 , the valve body 1 1 and the valve body 2 4 are connected by welding, the rear end of the valve body 2 4 is connected to the valve cover 9 , the valve cover 9 and the valve body 2 4 are welded to form a main valve chamber.

[0036] The middle section of the valve body 4 is welded with an inlet pipe 8, which is communicated with the valve cavity.

[0037] The check valve disc 3 is provided with a step, and the check valve back pressure spring 2 is sleeved on the rear part of the check valve disc step and is installed in the check valve cavity together with the check valve disc 3 .

[0038] The main valve disc 5 is connected to the T-head of the valve stem 6 through a T-slot. The bellows assembly 7 is sleeved on the outside of the valve stem 6, one end of which is welded to the outer surface of the valve stem 6, and the other end is connected to the valve cover 9. The bellows assembly 7, the main valve disc 5 and the valve stem 6 are installed in the valve cavity together.

[0039] The valve stem nut 11 comprises a cylinder, an annular body and a flange. The cylinder, the annular body and the flange are coaxially fixed in sequence. A connecting threaded hole is provided at one end of the cylinder close to the annular body.

[0040] The valve cover 9 and the bearing cover 17 are connected by screws 16. A cavity is formed between the valve cover 9 and the bearing cover 17. A flange of a valve stem nut 11 is arranged in the cavity. Bearings 10 are arranged on both sides of the flange.

[0041] The valve stem 6 is also provided with an anti-rotation cover 12, which is arranged at the end of the valve cover 9 away from the valve body 1, and is provided with a keyway corresponding to the position of the valve stem 6, and the valve stem 6 is limited to rotate by a key 15, and the anti-rotation cover 12 is also evenly provided with connecting screw holes, which are connected to the valve cover 9 by screws 16. The connecting threaded hole inside the valve stem nut 11 cooperates with the tail end of the valve stem 6 to realize transmission.

[0042] A hand wheel 13 is mounted on the cylindrical body of the valve stem nut 11 , and the hand wheel 13 is limitedly connected to the cylindrical body of the valve stem nut 11 through a key 14 .

[0043] A conical surface is respectively provided on the valve cavity of the main valve disc 5 and the valve body 2 4. When the main valve disc 5 and the valve cavity are in contact with each other, a pair of sealing surfaces are formed. When the main valve disc 5 and the valve body 2 4 are separated, the gap between the two can allow the medium to flow; the check valve disc 3 is provided with a hemispherical surface, and a conical surface is provided on the corresponding valve body 2 4. When they are in contact with each other, a pair of sealing surfaces are formed. When the check valve disc 3 and the corresponding valve body 2 4 are separated, the gap between the two can allow the medium to flow.

[0044] When the driving device rotates, the valve stem nut 11 is driven to rotate synchronously, and the valve stem 6 is moved under the action of the valve stem nut 11. Figure 2 As shown in the figure, when the valve stem 6 moves to the right, it drives the main valve disc 5 to move to the right, exposing the flow channel hole on the valve cavity of the valve body 2 4 to facilitate the flow of the medium. At this time, under the pressure of the medium, the reverse flow valve overcomes the pressure of the back pressure spring 2 of the check valve, presses the check valve disc 3 to move left, opens the flow channel hole on the entire reverse flow valve, and allows the medium to flow into the main valve cavity through the inlet pipe 8, and then flows into the check valve cavity through the main valve cavity and then flows into the pipeline through the valve body 1, as shown in the figure. Figure 1 As shown, when the valve stem 6 moves to the left, it drives the main valve flap 5 to move to the left, blocking the flow channel hole on the valve cavity of the valve body 2 4, preventing the medium from flowing. Figure 3As shown, when the hydrogen injection is finished, the medium is no longer supplied with pressure from the inlet pipe. At this time, the medium pressure in the valve body 1 is greater than the medium pressure in the valve body 2 4, pushing the check valve disc 3 to the right, blocking the flow channel hole on the reverse flow valve, preventing the medium from flowing in the opposite direction, and isolating the pipeline system from the hydrogen gas source system in time.

[0045] Example 2

[0046] As a further improvement measure based on Example 1, in order to facilitate automatic control, reduce the burden of manpower, and improve the controllability and automation of the system, the driving device is modified in this example.

[0047] Specifically, the driving device includes a motor, the output shaft of the motor is connected with a sleeve, and the sleeve is coaxially fixedly connected with an end of the valve stem nut 11 away from the valve body 2 4.

[0048] When the motor is started, the motor can drive the sleeve and the valve stem nut 11 to rotate synchronously.

[0049] The invention discloses a check-type quick-shutoff hydrogen injection valve, which adopts an integrated design of a check valve disc, a stop valve main valve disc and a flow channel coaxial line. The check valve has the advantages of a simple structure, the stop valve can isolate liquid metal sodium or hydrogen medium in the flow channel, the check valve can prevent the liquid metal sodium medium from flowing back into the valve cavity, the valve body is connected to the hydrogen injection pipeline, the inlet pipe is connected to the hydrogen gas source pipeline, the valve stem is driven by a hand wheel, the valve is quickly opened or closed, the installation space is saved and the operation is convenient, the practicability is strong, and it is worthy of promotion.

[0050] The above disclosure is only a preferred specific embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A non-return type rapid shut-off hydrogen injection valve, characterized in that: It comprises a valve body 1 (1), a check valve, a valve body 2 (4), a main valve stem assembly, a valve cover (9), a sealing connection assembly and a driving device; The valve body 1 (1), the valve body 2 (4), the valve cover (9), the sealing connection assembly and the driving device are connected in sequence, a main valve cavity is formed between the valve body 2 (4) and the valve cover (9), a main valve stem assembly for controlling the on and off of a medium flow path is arranged in the main valve cavity, and a check valve for preventing a medium from flowing back is arranged at the connection between the valve body 1 (1) and the valve body 2 (4); The main valve stem assembly comprises a main valve disc (5), a valve stem (6) and a bellows assembly (7), one end of the valve stem (6) is connected to the main valve disc (5), the bellows assembly (7) is sleeved on the middle section of the valve stem (6), one end of the bellows assembly (7) is fixed to the middle section of the valve stem (6), and the other end of the bellows assembly (7) is fixed to the valve cover (9); The sealing connection assembly comprises a valve stem nut (11), a bearing (10), a bearing pressure cover (17) and an anti-rotation cover (12); the valve stem nut (11) comprises a cylinder, an annular body and a flange which are coaxially fixedly connected in sequence, and a connecting structure is provided at one end of the cylinder close to the annular body; the anti-rotation cover (12) is sleeved and fixed on the end of the valve stem (6) away from the main valve disc (5), and the anti-rotation cover (12) is fixed to the valve cover (9); the valve stem nut (11) is sleeved on the anti-rotation cover (12); the connecting structure on the valve stem nut (11) is connected to the end of the valve stem (6) away from the main valve disc (5), and the end of the valve stem nut (11) away from the valve body (4) is connected to the driving device; the bearing pressure cover (17) is sleeved on the annular body of the valve stem nut (11), and the bearing pressure cover (17) is fixedly connected to the valve cover (9); a cavity is formed between the bearing pressure cover (17) and the valve cover (9), and a A flange having a valve stem nut (11), bearings (10) being arranged on both sides of the flange; the check valve comprising a check valve cavity, a check valve back pressure spring (2) and a check valve disc (3); the check valve cavity is arranged at the connection between the valve body 1 (1) and the valve body 2 (4); a check valve disc (3) is arranged in the check valve cavity; the check valve cavity and the check valve disc (3) are clearance-matched; the check valve disc (3) is close to the valve body 2 (4). When one end of the check valve is pressed against the check valve cavity, the medium flow path can be blocked; the end of the check valve flap (3) away from the valve body (4) is sleeved with a check valve back pressure spring (2); the middle section of the valve body (4) is provided with an inlet pipe (8), and the inlet pipe (8) is connected to the main valve cavity; the end of the valve stem (6) connected to the main valve flap (5) is provided with a T-shaped head, and the main valve flap (5) is provided with a T-shaped slot, and the T-shaped slot is matched with the T-shaped head for connection.

2. A non-return type rapid shut-off hydrogen injection valve as claimed in claim 1, characterized in that: The driving device is a hand wheel (13).

3. A non-return type rapid shut-off hydrogen injection valve as claimed in claim 1, characterized in that: The driving device comprises a motor, the output shaft of the motor is connected to a sleeve, and the sleeve is coaxially fixedly connected to an end of the valve stem nut (11) away from the second valve body (4).

4. A non-return type rapid shut-off hydrogen injection valve as claimed in claim 1, characterized in that: The valve body 1 (1), the valve body 2 (4) and the valve cover (9) are coaxial.

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