Stop valve for preventing medium backflow

Abstract

The utility model discloses a stop valve for preventing medium backflow, which comprises a stop valve main body, a valve switch and a non-return device, the top of the stop valve main body is provided with a switch connecting block, the valve switch is connected to the top of the switch connecting block, the bottom of the valve switch is connected with a lifting threaded rod, and the lifting threaded rod is connected with the non-return device. The bottom of the lifting threaded rod is connected with a valve element, the valve element is connected into the stop valve body, a threaded sleeve is arranged at the joint of the lifting threaded rod and the switch connecting block, and the two sides of the stop valve body are connected with a water inlet pipe and a water outlet pipe correspondingly. The check device is arranged between the water outlet pipe and the stop valve body, through the valve element structure of the valve and the check device, backflow of a medium flowing through the stop valve is avoided, and therefore the medium flows in the stop valve in a one-way mode. And the stop valve is higher in safety during use.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a stop valve for preventing medium backflow. Background Art

[0002] The stop valve is the most widely used valve. It has small friction between the sealing surfaces during opening and closing, is relatively durable, has a small opening height, is easy to manufacture and maintain, and is suitable not only for medium and low pressures, but also for high pressures.

[0003] The patent with application number CN201810874995.2 was retrieved and proposed a stop valve with low cost and good sealing performance. It is used in the air-conditioning field to prevent the leakage of refrigerant at ultra-low temperatures and has reliable safety performance.

[0004] Similar to the above-mentioned stop valve, although it has low cost, good sealing performance, and is used in the air-conditioning field to prevent the leakage of refrigerant at ultra-low temperatures, and has reliable safety performance, it does not have a structure to prevent the backflow of the medium. If backflow occurs during the transportation of some special media, it may cause medium contamination at the source, and for some flammable media, if backflow occurs during the transportation, it may cause safety problems.

[0005] Therefore, in view of this, the existing structure and defects are studied and improved, and a stop valve for preventing medium backflow is proposed, in order to achieve a more practical purpose. Utility Model Content

[0006] The purpose of the utility model is to provide a stop valve for preventing medium backflow, so as to solve the problem that a stop valve in the above background does not have a structure to prevent medium backflow, and some special media may cause medium contamination at the source if backflow occurs during transportation, and may cause safety hazards if backflow occurs during transportation of some flammable media.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stop valve for preventing medium backflow, comprising a stop valve body, a valve switch and a check device, a switch connecting block is arranged on the top of the stop valve body, and the valve switch is connected to the top of the switch connecting block, a lifting threaded rod is connected to the bottom of the valve switch, a valve core is connected to the bottom of the lifting threaded rod, and the valve core is connected to the stop valve body, a threaded sleeve is arranged at the connection between the lifting threaded rod and the switch connecting block, a water inlet pipe and a water outlet pipe are respectively connected to the two sides of the stop valve body, and connecting flanges are arranged at the connection between the stop valve body and the water inlet pipe and the water outlet pipe, and the check device is arranged between the water outlet pipe and the stop valve body.

[0008] Preferably, a water inlet baffle plate and a water outlet baffle plate are arranged in the stop valve body, the water inlet baffle plate is connected to the top of the pipe wall of the stop valve body close to the water inlet pipe, and the water outlet baffle plate is connected to the bottom of the pipe wall of the stop valve body close to the water outlet pipe.

[0009] Preferably, the valve core includes a connecting rod and a water stop block, and a sealing gasket is connected between the connecting rod and the water stop block. A limit connecting plate is provided on the top of the stop valve body, and the connecting rod is inserted into the limit connecting plate.

[0010] Preferably, the water inlet baffle plate and the water outlet baffle plate are centrally symmetrical to each other, and a water through hole is provided between the water inlet baffle plate and the water outlet baffle plate, the water retaining block and the water through hole are interlocked, and the diameter of the sealing gasket is larger than the diameter of the water retaining block.

[0011] Preferably, a water outlet is provided in the check device, and a water connecting ring is connected to one end of the check device close to the water outlet pipe, a spring mounting plate is provided at the center position of the water connecting ring, and multiple groups of support rods are connected between the spring mounting plate and the water connecting ring.

[0012] Preferably, a one-way valve block is provided in the water outlet, and the one-way valve block is a frustum, a connecting spring is connected to the one side of the one-way valve block close to the water connection ring, and the connecting spring is connected to the spring mounting plate.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the valve core structure and the check device are used to prevent the medium flowing through the stop valve from flowing back, so that the medium flows in one direction in the stop valve, making the stop valve safer when in use. The specific contents are as follows:

[0014] When the medium passes through the stop valve body, the medium flows out from the water hole, and the water inlet baffle plate and the water outlet baffle plate form a low inlet and a high outlet in the stop valve body to prevent the medium from flowing back in the stop valve body. When the medium flows through the check device, it first reaches the water outlet and squeezes the one-way valve block to move in the direction of the outlet pipe. In the process of the one-way valve block moving, the connecting spring is squeezed, so that a gap appears between the one-way valve block and the water outlet, and the medium reaches the water connection ring from the gap and is discharged by the water outlet. When the water stops flowing, the check valve will stop the water from flowing out of the check valve body, so the check valve will not stop flowing out of the check valve body, and the check valve body will not stop flowing out of the check valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of the main body of a stop valve for preventing medium backflow according to the utility model;

[0016] Figure 2 It is a schematic structural diagram of a side section of a main body of a stop valve for preventing medium backflow according to the utility model;

[0017] Figure 3 This is a structural schematic diagram of a valve core of a stop valve for preventing medium backflow according to the utility model;

[0018] Figure 4 This is a structural schematic diagram of a one-way valve block of a stop valve for preventing medium backflow according to the utility model;

[0019] Figure 5 The utility model is a schematic structural diagram of a water connection ring of a stop valve for preventing medium backflow.

[0020] In the figure: 1. stop valve body; 11. water inlet baffle plate; 12. water outlet baffle plate; 13. limit connecting plate; 14. valve core; 141. connecting rod; 142. water baffle block; 143. sealing gasket; 15. water hole; 2. switch connecting block; 3. valve switch; 31. lifting threaded rod; 32. threaded sleeve; 4. check device; 41. water outlet; 42. one-way valve block; 421. connecting spring; 43. water connecting ring; 431. spring mounting plate; 432. support rod; 5. water inlet pipe; 6. water outlet pipe; 7. connecting flange. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figures 1 to 5The utility model provides a technical solution: a stop valve for preventing medium backflow, comprising a stop valve body 1, a valve switch 3 and a check device 4, a switch connection block 2 is arranged on the top of the stop valve body 1, and the valve switch 3 is connected to the top of the switch connection block 2, a lifting threaded rod 31 is connected to the bottom of the valve switch 3, a valve core 14 is connected to the bottom of the lifting threaded rod 31, and the valve core 14 is connected to the inside of the stop valve body 1, a threaded sleeve 32 is arranged at the connection between the lifting threaded rod 31 and the switch connection block 2, a water inlet pipe 5 and a water outlet pipe 6 are respectively connected to the two sides of the stop valve body 1, and a connecting flange 7 is arranged at the connection between the stop valve body 1 and the water inlet pipe 5 and the water outlet pipe 6, and the check device 4 is arranged between the water outlet pipe 6 and the stop valve body 1.

[0023] The valve switch 3 is connected to the stop valve body 1 through the switch connecting block 2, and the lifting threaded rod 4 is moved up and down in the threaded sleeve 32 by rotating the valve switch 3. The lifting threaded rod 4 drives the valve core 14 to move during the lifting process, and completes the opening and closing of the stop valve body 1 during the movement. The water inlet pipe 5 and the water outlet pipe 6 are both connected to the stop valve body 1 through the connecting flange 7. The medium enters the stop valve body 1 through the water inlet pipe 5 and is discharged through the water outlet pipe 6. In the process of discharge, the check device 4 can prevent the medium from flowing back.

[0024] A water inlet baffle plate 11 and a water outlet baffle plate 12 are arranged in the stop valve body 1, the water inlet baffle plate 11 is connected to the top of the pipe wall of the stop valve body 1 on the side close to the water inlet pipe 5, the water outlet baffle plate 12 is connected to the bottom of the pipe wall of the stop valve body 1 on the side close to the water outlet pipe 6, the valve core 14 includes a connecting rod 141 and a water baffle block 142, and a sealing gasket 143 is connected between the connecting rod 141 and the water baffle block 142, a limited connecting plate 13 is arranged on the top of the stop valve body 1, and the connecting rod 141 is inserted in the limited connecting plate 13, the water inlet baffle plate 11 and the water outlet baffle plate 12 are centrally symmetrical with each other, and a water through hole 15 is arranged between the water inlet baffle plate 11 and the water outlet baffle plate 12, the water baffle block 142 is interlocked with the water through hole 15, and the diameter of the sealing gasket 143 is larger than that of the water baffle block 142 in diameter, the valve core 14 is connected to the lifting threaded rod 4 through the connecting rod 141, and the valve core 14 is close to or away from the water hole 15 through the water retaining block 142 during the lifting process, thereby completing the opening and closing of the stop valve body 1, and the moving distance of the valve core 14 is limited by the limiting connecting plate 13, thereby preventing the valve core 14 from descending too high, and when the stop valve body 1 is closed, that is, when the water retaining block 142 and the water hole 15 are fully embedded, the sealing gasket 143 covers the top of the water hole 15, thereby completing the sealing of the water hole 15, avoiding the possible backflow of the medium from the gap between the water retaining block 142 and the water hole 15, and the water inlet retaining plate 11 and the water outlet retaining plate 12 form a low inlet and a high outlet in the stop valve body 1, preventing the medium from flowing back in the stop valve body 1.

[0025] A water port 41 is provided in the check device 4, and a water connection ring 43 is connected to one end of the check device 4 close to the water outlet pipe 6, a spring mounting plate 431 is provided at the center of the water connection ring 43, and a plurality of support rods 432 are connected between the spring mounting plate 431 and the water connection ring 43, a one-way valve block 42 is provided in the water port 41, and the one-way valve block 42 is a truncated cone, a connecting spring 421 is connected to one side of the one-way valve block 42 close to the water connection ring 43, and the connecting spring 421 is connected to the spring mounting plate 431, and when the medium flows through the check device 4, it first reaches the water port 41, and squeezes the one-way valve block 42 to move in the direction of the water outlet pipe 6, and in the process of the movement of the one-way valve block 42, squeezes the connecting spring 421, so that a gap appears between the one-way valve block 42 and the water outlet 41, and the medium reaches the water connection ring 43 from the gap, and flows to the water outlet pipe 6 from the gap between the water connection ring 43 and the multiple groups of support rods 432 and the spring mounting plate 431, and when the stop valve body 1 is closed, the connecting spring 421 drives the one-way valve block 42 to rebound, and after complete rebound, the one-way valve block 42 blocks the water outlet 41 to prevent the medium from flowing back at the check device 4.

[0026] Working principle: When using a stop valve to prevent medium backflow, the water inlet pipe 5 and the water outlet pipe 6 can be connected to the two ends of the stop valve body 1 through the connecting flange 7, and the valve switch 3 is connected to the stop valve body 1 through the switch connecting block 2, and the medium enters the stop valve body 1 through the water inlet pipe 5 and is discharged through the water outlet pipe 6, and the stop valve body 1 is opened and closed by the valve switch 3, and the lifting threaded rod 4 is moved up and down in the threaded sleeve 32 by rotating the valve switch 3, and the lifting threaded rod 4 drives the valve core 14 to move during the lifting process, and during the movement, it approaches or moves away from the water hole 15 through the water retaining block 142, thereby completing the opening and closing of the stop valve body 1.

[0027] When the medium passes through the stop valve body 1, the medium flows out from the water hole 15, and the water inlet baffle plate 11 and the water outlet baffle plate 12 form a low inlet and a high outlet in the stop valve body 1 to prevent the medium from flowing back in the stop valve body 1. When the medium flows through the check device 4, it first reaches the water outlet 41 and squeezes the one-way valve block 42 to move toward the water outlet pipe 6. In the process of the movement of the one-way valve block 42, the connecting spring 421 is squeezed, so that a gap appears between the one-way valve block 42 and the water outlet 41, and the medium reaches the water connection ring 43 from the gap, and flows to the water outlet pipe 6 from the gap between the water connection ring 43 and the multiple groups of support rods 432 and the spring mounting plate 431.

[0028] When the stop valve body 1 is closed, that is, the water retaining block 142 is fully engaged with the water hole 15, the sealing gasket 143 covers the top of the water hole 15, thereby completing the sealing of the water hole 15 and preventing the medium from flowing back through the gap between the water retaining block 142 and the water hole 15, and when the stop valve body 1 is closed, the connecting spring 421 drives the one-way valve block 42 to rebound, and after fully rebounding, the one-way valve block 42 blocks the water outlet 41 to prevent the medium from flowing back at the check device 4.

Claims

1. A stop valve for preventing backflow of a medium, comprising a stop valve body (1), a valve switch (3) and a check device (4), characterized in that: A switch connection block (2) is arranged at the top of the stop valve body (1), and the valve switch (3) is connected to the top of the switch connection block (2); a lifting threaded rod (31) is connected to the bottom of the valve switch (3); a valve core (14) is connected to the bottom of the lifting threaded rod (31), and the valve core (14) is connected to the inside of the stop valve body (1); a threaded sleeve (32) is arranged at the connection between the lifting threaded rod (31) and the switch connection block (2); a water inlet pipe (5) and a water outlet pipe (6) are respectively connected to the two sides of the stop valve body (1), and connection flanges (7) are arranged at the connection between the stop valve body (1) and the water inlet pipe (5) and the water outlet pipe (6); and the check device (4) is arranged between the water outlet pipe (6) and the stop valve body (1).

2. A stop valve for preventing medium backflow according to claim 1, characterized in that: A water inlet baffle plate (11) and a water outlet baffle plate (12) are arranged in the stop valve body (1); the water inlet baffle plate (11) is connected to the top of the pipe wall of the stop valve body (1) close to the water inlet pipe (5), and the water outlet baffle plate (12) is connected to the bottom of the pipe wall of the stop valve body (1) close to the water outlet pipe (6).

3. A stop valve for preventing medium backflow according to claim 2, characterized in that: The valve core (14) comprises a connecting rod (141) and a water stop block (142), and a sealing gasket (143) is connected between the connecting rod (141) and the water stop block (142). A limit connecting plate (13) is provided on the top of the stop valve body (1), and the connecting rod (141) is inserted into the limit connecting plate (13).

4. A stop valve for preventing medium backflow according to claim 3, characterized in that: The water inlet baffle plate (11) and the water outlet baffle plate (12) are centrally symmetrical with each other, and a water through hole (15) is provided between the water inlet baffle plate (11) and the water outlet baffle plate (12), the water retaining block (142) and the water through hole (15) are mutually engaged, and the diameter of the sealing gasket (143) is greater than the diameter of the water retaining block (142).

5. A stop valve for preventing medium backflow according to claim 1, characterized in that: A water outlet (41) is provided in the non-return device (4), and a water connection ring (43) is connected to one end of the non-return device (4) close to the water outlet pipe (6), a spring mounting plate (431) is provided at the center of the water connection ring (43), and a plurality of support rods (432) are connected between the spring mounting plate (431) and the water connection ring (43).

6. A stop valve for preventing medium backflow according to claim 5, characterized in that: A one-way valve block (42) is arranged in the water passage (41), and the one-way valve block (42) is a truncated cone. A connecting spring (421) is connected to the one side of the one-way valve block (42) close to the water connection ring (43), and the connecting spring (421) is connected to the spring mounting plate (431).

Images