Low-temperature high-pressure check valve

Abstract

The low-temperature and high-pressure check valve comprises a valve body, a valve rod and a valve element, the valve body is provided with an inflow channel, an outflow channel and a valve seat, the valve body is provided with a pressure relief part on one side of the inflow channel, the pressure relief part is provided with a pressure relief cavity, one end, close to the inflow channel, of the pressure relief cavity is provided with a sealing seat, and one end, away from the inflow channel, of the pressure relief cavity is provided with an annular protruding part. A second spring is fixed on the annular convex part, the pressure relief clack elastically abuts against the sealing seat and is in sealing fit with the sealing seat, an opening is formed in the top of the valve body, a detachable connecting seat is arranged above the valve body, a cavity is formed in the connecting seat, and a second spring and a piston plate capable of sliding up and down are arranged in the connecting seat; the upper end of the valve rod sequentially penetrates through the opening and the connecting base and then stretches into the cavity to abut against the piston plate, the lower end of the second spring abuts against the piston plate, a screw hole is formed in the top of the connecting base and is in threaded connection with a screw, and the bottom of the screw is rotationally connected with the piston plate.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a cryogenic high-pressure check valve. Background Art

[0002] A cryogenic high-pressure check valve refers to a valve that automatically opens and closes the valve flap relying on the flow of the medium itself to prevent the reverse flow of the medium, also known as a non-return valve, one-way valve, counterflow valve, back pressure valve, etc. The check valve belongs to an automatic valve, and its main functions are to prevent the reverse flow of the medium, prevent the pump and the driving motor from reversing, and the discharge of the container medium. The check valve can also be used on the pipeline that supplies the auxiliary system whose pressure may rise above the system pressure.

[0003] Currently, the high-pressure check valves on the market and in the materials mainly consist of a valve body and a valve core arranged in the valve body. The valve core in the valve body is usually a disc-shaped valve flap disc-type valve core. During use, the valve core is affected by high pressure and is prone to deformation. Moreover, the valve core is prone to shaking and offset, resulting in wear of the valve seat in the valve body, thus shortening the service life of the valve core. And the existing cryogenic high-pressure check valves are usually not easy to disassemble. When the valve core is worn, it is inconvenient to replace, which is time-consuming and laborious. Content of the Utility Model

[0004] The purpose of the utility model is to provide a cryogenic high-pressure check valve to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions: A cryogenic high-pressure check valve includes a valve body. A valve rod and a valve core are arranged in the valve body. Inlet channels and outlet channels are arranged on both sides in the valve body. A valve seat is arranged between the inlet channel and the outlet channel. It is characterized in that a pressure relief part is arranged on one side of the valve body where the inlet channel enters. A pressure relief cavity communicating with the inlet channel is opened in the pressure relief part. A sealing seat is arranged at one end of the pressure relief cavity close to the inlet channel, and a ring convex part is arranged at the end far from the inlet channel. A pressure relief flap is arranged in the pressure relief cavity. A second spring is fixed on the ring convex part. One end of the second spring far from the ring convex part is connected to the pressure relief flap. The pressure relief flap elastically abuts against the sealing seat and is in sealing cooperation. An opening is arranged at the top of the valve body. A detachable connection seat is arranged above the valve body. A cavity is arranged in the connection seat. A second spring and a piston plate that can slide up and down are arranged in the connection seat. The upper end of the valve rod sequentially passes through the opening and the connection seat and then extends into the cavity to abut against the piston plate. The lower end of the second spring abuts against the piston plate. A screw hole is opened at the top of the connection seat. A screw is threadedly connected to the screw hole. The bottom of the screw is rotatably connected to the piston plate.

[0006] With the above technical solution, when the valve is in the closed state and the medium flowing into the passage generates high pressure, causing the valve core to be under the action of high pressure, the pressure relief flap is also under the action of high pressure. The pressure relief flap is pushed to generate displacement and separate from the sealing seat, and at the same time, the first spring is compressed. At this time, the medium flowing into the passage can flow into the pressure relief cavity, and the pressure in the flowing-in passage is reduced, thereby reducing the force of high pressure on the valve core. When the valve core needs to be replaced after wear, the connecting seat and the valve body are disassembled, and the valve stem and the valve core can be disassembled simultaneously, so that the valve core can be replaced. The operation is convenient, time-saving and labor-saving.

[0007] As a further optimization of the present utility model, a plurality of fixing grooves are provided on the upper end of the pen case along the circumferential direction of the axis. Each fixing groove is provided with a fixing block, and a magnet is provided at the front end of the fixing block.

[0008] With the above technical solution, by providing the fixing grooves, the fixing blocks are detachable relative to the pen case, which is convenient for replacement. When ink filling is not required, the fixing blocks can be disassembled.

[0009] As a further optimization of the present utility model, a liquid discharge port is provided at the end of the pressure relief part; a sealing cover for opening or closing the liquid discharge port is further included.

[0010] With the above technical solution, when the medium pressure in the pressure relief cavity is relatively high, the liquid discharge port is opened through the sealing cover, and the medium in the pressure relief cavity can be discharged.

[0011] As a further optimization of the present utility model, a pressure sensor is provided in the pressure relief cavity; a controller and a buzzer are further included. The buzzer is connected to the pressure sensor, and the controller is connected to both the pressure sensor and the buzzer.

[0012] With the above technical solution, when the pressure sensor detects that the pressure in the pressure relief cavity is relatively high, a signal is sent to the controller, and the controller controls the buzzer to sound, thereby reminding the staff to discharge the medium in the pressure relief cavity.

[0013] As a further optimization of the present utility model, the liquid discharge port is provided with internal threads, the sealing cover is provided with a sealing part, and the sealing part is provided with external threads adapted to the liquid discharge port.

[0014] As a further optimization of the present utility model, a first connection flange is provided at the top of the valve body, a second connection flange is provided at the bottom of the connecting seat, and the first connection flange and the second connection flange are connected by bolts.

[0015] As a further optimization of the present utility model, a protruding connecting part is provided at the bottom of the connecting seat. A first sealing ring is provided between the sealing part and the inner wall of the opening. A through hole for the valve stem to pass through is provided at the bottom of the connecting seat, and a second sealing ring is provided between the through hole and the valve stem.

[0016] With the above technical solution, the sealing ring can improve the sealing performance of the valve body and reduce the situation of medium leakage.

[0017] The beneficial effects of the present utility model are as follows: When the valve is in the closed state and the medium flowing into the channel generates high pressure, causing the valve core to be under the action of high pressure, the pressure relief flap is also under the action of high pressure. The pressure relief flap is pushed to generate displacement and separated from the sealing seat, while squeezing the first spring. At this time, the medium flowing into the channel can flow into the pressure relief cavity, and the pressure in the flowing-in channel is reduced, thereby reducing the force of high pressure on the valve core. When the valve core needs to be replaced after wear, the connecting seat and the valve body are disassembled, and the valve stem and the valve core can be disassembled at the same time, and then the valve core can be replaced, which is convenient to operate and saves time and effort. Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of the present utility model.

[0019] The meanings of the reference numerals in the figure: 1. Valve body; 11. Inflow channel; 12. Outflow channel; 13. Valve seat; 14. Valve stem; 15. Valve core; 2. Pressure relief part; 21. Pressure relief cavity; 211. Sealing seat; 212. Ring convex part; 22. Drain port; 3. Pressure relief flap; 4. First spring; 5. Sealing cover; 51. Sealing part; 6. Connecting seat; 61. Cavity; 611. Piston flap; 612. Second spring; 62. Connecting part; 63. Screw hole; 71. First sealing ring; 72. Second sealing ring; 8. Screw; 91. Pressure sensor; 92. Buzzer. Detailed Embodiments

[0020] This specific embodiment is only an interpretation of the present utility model, and it does not limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the Patent Law.

[0021] See the attached Figure 1 , this embodiment disclosed by the present utility model is further provided with: A low-temperature high-pressure check valve, including a valve body 1, a valve stem 14 and a valve core 15 are arranged in the valve body 1, an inflow channel 11 and an outflow channel 12 are arranged on both sides in the valve body 1, a valve seat 13 is arranged between the inflow channel 11 and the outflow channel 12, a pressure relief part 2 is arranged on one side of the valve body 1 where the inflow channel enters, a pressure relief cavity 21 communicating with the inflow channel 11 is opened in the pressure relief part 2, a sealing seat 211 is arranged at one end of the pressure relief cavity 21 close to the inflow channel 11, a ring convex part 212 is arranged at the end far from the inflow channel 11, a pressure relief flap 3 is arranged in the pressure relief cavity 21, a second spring 612 is fixed on the ring convex part 212, and one end of the second spring 612 far from the ring convex part 212 is connected to the pressure relief flap 3. The pressure relief flap 3 elastically abuts against the sealing seat 211 and is in sealing cooperation;

[0022] A drain port 22 is provided at the end of the pressure relief part 2; further included is a sealing cover 5 for opening or closing the drain port 22. Specifically, the drain port 22 is provided with internal threads, the sealing cover 5 is provided with a sealing part 51, and the sealing part 51 is provided with external threads adapted to the drain port 22. Further, a pressure sensor 91 is provided in the pressure relief cavity 21; also included are a controller and a buzzer 92, the buzzer 92 is connected to the pressure sensor 91, and the controller is electrically connected to both the pressure sensor 91 and the buzzer 92;

[0023] The top of the valve body 1 is provided with an opening, and a detachable connection seat 6 is provided above the valve body 1. Specifically, the top of the valve body 1 is provided with a first connection flange, the bottom of the connection seat 6 is provided with a second connection flange, and the first connection flange and the second connection flange are connected by bolts. A cavity 61 is provided in the connection seat 6. A second spring 612 and a piston plate that can slide up and down are provided in the connection seat 6. The upper end of the valve stem 14 sequentially passes through the opening and the connection seat 6 and then extends into the cavity 61 to abut against the piston plate. A sealing ring is provided at the top of the valve body 1, and the sealing ring is closely attached to the side wall of the valve stem 14. The sealing ring can improve the sealing performance of the valve body 1 and reduce the situation of medium leakage. The lower end of the second spring 612 abuts against the piston plate. A screw hole 63 is provided at the top of the connection seat 6, and a screw rod 8 is threadedly connected to the screw hole 63. The bottom of the screw rod 8 is rotatably connected to the piston plate;

[0024] Further, the bottom of the connection seat 6 is provided with a protruding connection part 62. A first sealing ring 71 is provided between the sealing part 51 and the inner wall of the opening. The bottom of the connection seat 6 is provided with a through hole for the valve stem 14 to pass through, and a second sealing ring 72 is provided between the through hole and the valve stem 14. The sealing ring can improve the sealing performance of the valve body 1 and reduce the situation of medium leakage.

[0025] The principle of the present utility model is as follows: When the valve is in the closed state, when the medium flowing into the channel 11 generates high pressure and the valve core 15 is subjected to the high pressure, the pressure relief flap 3 is also subjected to the high pressure force at the same time. The pressure relief flap 3 is pushed to generate a displacement and is separated from the sealing seat 211, and at the same time, the first spring 4 is compressed. At this time, the medium flowing into the channel 11 can flow into the pressure relief cavity 21. At this time, the pressure in the channel 11 decreases, thereby reducing the high pressure force acting on the valve core 15. When the pressure sensor 91 detects that the pressure in the pressure relief cavity 21 is relatively high, it sends a signal to the controller, and the controller controls the buzzer 92 to sound, thereby reminding the staff to discharge the medium in the pressure relief cavity 21. The staff rotates the sealing cover 5 to open the drain hole, thereby discharging the medium in the pressure relief cavity 21;

[0026] When the valve core 15 needs to be replaced after being worn, the connection seat 6 and the valve body 1 are disassembled, and the valve stem 14 and the valve core 15 can be disassembled at the same time, and then the valve core 15 can be replaced. The operation is convenient and time-saving and labor-saving.

[0027] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications made under the above assumptions should also be regarded as the protection scope of the present utility model.

Claims

1. A low-temperature and high-pressure check valve, comprising a valve body (1), a valve stem (14) and a valve core (15) are arranged in the valve body (1), an inflow channel (11) and an outflow channel (12) are arranged on both sides in the valve body (1), and a valve seat (13) is arranged between the inflow channel (11) and the outflow channel (12), characterized in that, The valve body (1) is provided with a pressure relief portion (2) on one side of the inlet passage. A pressure relief cavity (21) communicating with the inflow passage (11) is formed in the pressure relief portion (2). A sealing seat (211) is provided at one end of the pressure relief cavity (21) close to the inflow passage (11), and a ring convex portion (212) is provided at the end away from the inflow passage (11). A pressure relief flap (3) is arranged in the pressure relief cavity (21). A second spring (612) is fixed on the ring convex portion (212). One end of the second spring (612) away from the ring convex portion (212) is connected to the pressure relief flap (3). The pressure relief flap (3) elastically abuts against the sealing seat (211) and is in sealing cooperation therewith. An opening is provided at the top of the valve body (1). A detachable connection seat (6) is arranged above the valve body (1). A cavity (61) is formed in the connection seat (6). A second spring (612) and a piston plate capable of sliding up and down are arranged in the connection seat (6). The upper end of the valve stem (14) sequentially passes through the opening and the connection seat (6) and then extends into the cavity (61) to abut against the piston plate. The lower end of the second spring (612) abuts against the piston plate. A screw hole (63) is formed at the top of the connection seat (6). A screw rod (8) is threadedly connected to the screw hole (63). The bottom of the screw rod (8) is rotatably connected to the piston plate.

2. The low-temperature high-pressure check valve according to claim 1, wherein, A drain port (22) is formed at the end of the pressure relief portion (2); and further includes a sealing cover (5) for opening or closing the drain port (22).

3. The one-way valve for low temperature and high pressure according to claim 2, characterized in that A pressure sensor (91) is arranged in the pressure relief cavity (21); and further includes a controller and a buzzer (92).

4. A low-temperature high-pressure check valve according to claim 2 or 3, characterized in that, The drain port (22) is provided with internal threads, and the sealing cover (5) is provided with a sealing portion (51). The sealing portion (51) is provided with external threads adapted to the drain port (22).

5. A low-temperature and high-pressure check valve according to claim 1, characterized in that, The top of the valve body (1) is provided with a first connecting flange, and the bottom of the connection seat (6) is provided with a second connecting flange. The first connecting flange and the second connecting flange are connected by bolts.

6. The low-temperature and high-pressure check valve according to claim 4, wherein, The bottom of the connection seat (6) is provided with a protruding connecting portion (62). A first sealing ring (71) is arranged between the sealing portion (51) and the inner wall of the opening. The bottom of the connection seat (6) is provided with a through hole for the valve stem (14) to pass through. A second sealing ring (72) is arranged between the through hole and the valve stem (14).

Images