One-way valve with double-insurance sealing mechanism

Abstract

The one-way valve with the double-insurance sealing mechanism comprises a valve body, and a water inlet flow channel, a water outlet flow channel, a sealing cavity and a mounting hole are formed in the valve body. A sealing assembly is arranged in the sealing cavity and comprises a push rod, a limiting ring, a first spring, a first valve element, a sealing cover, a through groove, a sealing gasket and a first valve seat. According to the one-way valve, the first spring pushes the sealing cover to be attached to the sealing ring, the sealing gasket is attached to the groove in the first valve seat, at the moment, a connecting gap between the first valve element and the first valve seat can be sealed again, then the situation that fluid flows back can be effectively prevented, and the non-return effect of the one-way valve is enhanced; by adding the sealing cover and other structures, the sealing performance between the first valve seat and the first valve element is enhanced, and the non-return effect of the one-way valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a check valve, concretely is a check valve with double insurance sealing mechanism, belongs to check valve technical field. BACKGROUND

[0002] Check valve is also called check valve or non-return valve, is often used in hydraulic system to prevent medium reverse flow, traditional check valve includes valve body, valve core, spring. When the medium in the system flows forward, if the medium pressure of the inlet is greater than the spring setting pressure, then can push away the valve core pressed by the spring and realize the flow circulation, when the medium pressure of the inlet is less than the spring pressure or the medium flows reversely, the valve core is automatically closed. When the medium in the system mixes with particle impurities, the valve core may contact impurities in the process of opening and closing, which may affect the sealing effect of the valve core over time. Once the valve core fails, the medium in the system may backflow.

[0003] It is known that the double insurance check valve (publication number: CN216590111U) discloses a double insurance check valve, which further sets a check structure at the inlet end of the valve, so that even if the valve seat is damaged and cannot be sealed, the medium still cannot backflow, achieving the effect of double cutoff backflow. When the valve is closed, the valve seat is attached to the tapered surface at the end of the inlet flow channel, and the valve is closed. Even if the valve seat cannot be completely sealed, the steel ball is tightly attached to the transition curve under the combined action of the steel ball spring and the medium pressure at the outlet, preventing the backflow of the medium at the outlet.

[0004] By setting the double check mechanism, the effective prevention of medium backflow is realized, which significantly improves the performance and reliability of the check valve. However, in actual application, although the double check mechanism provides strong backflow prevention, the valve seat, a key component, will inevitably be worn out during long-term use, leading to a decrease in the sealing performance between the valve seat and the valve core, and thus affecting the check effect of the check valve. Therefore, a check valve with double insurance sealing mechanism is proposed. SUMMARY

[0005] The utility model aims at providing a check valve with double insurance sealing mechanism to solve one of the problems in the background technology.

[0006] The utility model is implemented by the following technical schemes: a check valve with double insurance sealing mechanism, comprising a valve body, a water inlet flow channel, a water outlet flow channel, a sealing cavity and a mounting hole are formed in the valve body;

[0007] A sealing assembly is arranged in the sealing cavity, the sealing assembly comprises a push rod, a limiting ring, a first spring, a first valve core, a sealing cover, a through slot, a sealing gasket and a first valve seat;

[0008] The limiting ring is fixedly connected to the outer side wall of the push rod, the first spring sleeve is connected to the outside of the push rod, the first valve core is fixedly connected to the bottom end of the push rod, the sealing cover is slidably connected to the outer side wall of the push rod, the through grooves are symmetrically arranged on the upper surface of the sealing cover, the upper surface of the first valve core is embedded with the sealing ring, the outer side wall top of the first valve seat is provided with a groove, the sealing gasket is fixedly connected to the lower surface of the sealing cover, and the outer side wall of the first valve core is attached to the inner side wall of the first valve seat.

[0009] As a further preferred technical scheme of the present application, the top end of the first spring abuts against the lower surface of the limiting ring, and the bottom end of the first spring abuts against the upper surface of the sealing cover.

[0010] As a further preferred technical scheme of the present application, the sealing ring is attached to the inner top wall of the sealing cover, and the outer side wall of the sealing gasket is attached to the inner side wall of the groove.

[0011] As a further preferred technical scheme of the present application, the first valve seat is installed on the inner side wall of the sealing cavity, and the sealing cavity is in communication with the water inlet flow channel, the water outlet flow channel and the mounting hole respectively.

[0012] As a further preferred technical scheme of the present application, the top end of the push rod is fixedly connected with a sliding plate, and the top of the sliding plate is provided with a second spring.

[0013] As a further preferred technical scheme of the present application, the sliding plate is slidably connected to the inner side wall of the mounting hole, the inner side wall of the mounting hole is screw-connected with an adjusting nut at the top, and the two ends of the second spring abut against the sliding plate and the adjusting nut respectively.

[0014] As a further preferred technical scheme of the present application, the water inlet flow channel is internally provided with a second valve core, a third spring and a second valve seat.

[0015] The second valve seat is fixedly connected to the inner side wall of the water inlet flow channel, the second valve core is attached to the second valve seat, one end of the third spring abuts against the valve body, and the other end of the third spring abuts against the second valve core.

[0016] As a further preferred technical scheme of the present application, the water inlet flow channel and the water outlet flow channel are internally installed with a connecting seat.

[0017] The utility model discloses the advantages are as follows:

[0018] 1. The utility model discloses a sealing assembly is set up, when fluid countercurrent, second spring promotes first valve core and first valve seat and is pasted, and the bottom of sealing cavity is sealed, first spring promotes sealing cover and sealing ring and is pasted, and sealing pad and the groove on first valve seat and is pasted, at this moment can the connecting gap between first valve core and first valve seat is sealed again, and cooperate second valve core and second valve seat to seal the water inlet channel, and then can effectively prevent the backflow condition of fluid, and the non-return effect of check valve is strengthened.

[0019] 2. The utility model discloses through increase sealing cover and other structures, the sealing performance between first valve seat and first valve core is strengthened, and the non-return effect of check valve is improved. DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for ordinary skilled person in the art, other drawings can be obtained according to these drawings without paying creative labor.

[0021] Figure 1 It is the structural schematic diagram of the utility model;

[0022] Figure 2 It is the sectional view of the utility model;

[0023] Figure 3 It is the sealing assembly structure schematic diagram of the utility model;

[0024] Figure 4 It is the sealing assembly structure exploded schematic diagram of the utility model.

[0025] In the drawing: 101, sealing assembly;11, sliding plate;12, push rod;13, limit ring;14, first spring;15, first valve core;16, sealing cover;17, through groove;18, sealing pad;19, first valve seat;20, groove;21, second spring;22, adjusting nut;23, sealing ring;31, valve body;32, water inlet channel;33, water outlet channel;34, sealing cavity;35, mounting hole;36, second valve core;37, third spring;38, second valve seat;39, connecting seat. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0027] Embodiment

[0028] Please refer to Figures 1-4 The present application provides a technical solution: a one-way valve with double safety sealing mechanism, comprising a valve body 31, a water inlet channel 32, a water outlet channel 33, a sealing cavity 34 and a mounting hole 35 are formed in the valve body 31.

[0029] A sealing assembly 101 is arranged in the sealing cavity 34, and the sealing assembly 101 comprises a push rod 12, a limiting ring 13, a first spring 14, a first valve core 15, a sealing cover 16, a through slot 17, a sealing gasket 18 and a first valve seat 19.

[0030] The limiting ring 13 is fixedly connected to the outer side wall of the push rod 12, the first spring 14 is sleeved on the outside of the push rod 12, the top end of the first spring 14 abuts against the lower surface of the limiting ring 13, the bottom end of the first spring 14 abuts against the upper surface of the sealing cover 16, the sealing ring 23 is attached to the inner top wall of the sealing cover 16, and the sealing cover 16 can be pushed by the first spring 14 to keep the sealing cover 16 attached to the sealing ring 23, thereby enhancing the sealing effect.

[0031] The first valve core 15 is fixedly connected to the bottom end of the push rod 12, the sealing cover 16 is slidingly connected to the outer side wall of the push rod 12, the through slot 17 is symmetrically formed in the upper surface of the sealing cover 16, the upper surface of the first valve core 15 is embedded with the sealing ring 23, the outer side wall of the first valve seat 19 is provided with a groove 20 at the top, the sealing gasket 18 is fixedly connected to the lower surface of the sealing cover 16, and the outer side wall of the first valve core 15 is attached to the inner side wall of the first valve seat 19. The cooperation of the first valve core 15 and the first valve seat 19 can seal the bottom of the sealing cavity 34, thereby avoiding the backflow of fluid.

[0032] The sealing gasket 18 is usually made of rubber material with good elasticity and corrosion resistance, such as nitrile rubber, fluorine rubber, etc. The elasticity of the material enables the sealing gasket 18 to deform when subjected to pressure, tightly fitting on the inner side wall of the groove 20 at the top of the outer side wall of the first valve seat 19, thereby effectively preventing fluid leakage through this part. The sealing ring 23 is also made of high-performance sealing rubber material, with excellent sealing performance and wear resistance. When the sealing cover 16 is tightly fitted with the sealing ring 23 under the action of the first spring 14, the sealing ring 23 can form a reliable sealing surface between the two, further enhancing the sealing effect of the one-way valve and preventing fluid backflow from the gap between the first valve core 15 and the sealing cover 16.

[0033] In this embodiment, specifically, the outer side wall of the sealing gasket 18 is fitted to the inner side wall of the groove 20, and the sealing effect can be enhanced through the cooperation of the sealing gasket 18 and the sealing ring 23.

[0034] In this embodiment, specifically, the first valve seat 19 is installed on the inner side wall of the sealing cavity 34, which is in communication with the water inlet channel 32, the water outlet channel 33 and the mounting hole 35. The top end of the push rod 12 is fixedly connected with the sliding plate 11, and the top of the sliding plate 11 is provided with the second spring 21. When fluid backflow occurs, the fluid flows from the water inlet channel 32 into the inside of the sealing cavity 34. At this time, under the push of the second spring 21, the first valve core 15 is tightly fitted with the first valve seat 19, sealing the bottom of the sealing cavity 34. The first spring 14 pushes the sealing cover 16, which in turn pushes the sealing gasket 18 to tightly fit with the first valve seat 19, and at the same time, the sealing cover 16 tightly fits with the sealing ring 23. Thus, the connection gap between the first valve core 15 and the first valve seat 19 can be resealed by the sealing cover 16, thereby enhancing the sealing effect and effectively preventing liquid backflow.

[0035] In this embodiment, specifically, the sliding plate 11 is slidingly connected to the inner side wall of the mounting hole 35, and the inner side wall of the mounting hole 35 is threadedly connected with the adjusting nut 22. The two ends of the second spring 21 are respectively abutted against the sliding plate 11 and the adjusting nut 22. By rotating the adjusting nut 22, the length of the second spring 21 can be adjusted to adjust the sealing effect of the first valve core 15 and the first valve seat 19, thereby meeting different use requirements.

[0036] In this embodiment, specifically, the inside of the water inlet channel 32 is provided with the second valve core 36, the third spring 37 and the second valve seat 38.

[0037] The second valve seat 38 is fixedly connected to the inner side wall of the water inlet channel 32, the second valve core 36 is attached to the second valve seat 38, one end of the third spring 37 abuts against the valve body 31, the other end of the third spring 37 abuts against the second valve core 36, the second valve core 36 is pushed by the third spring 37, and the second valve core 36 is tightly attached to the second valve seat 38, so that the backflow of the fluid can be effectively prevented under the joint action of the sealing assembly 101, and the reverse effect of the one-way valve is enhanced.

[0038] In the embodiment, specifically, the water inlet channel 32 and the water outlet channel 33 are internally provided with the connecting seat 39, and the one-way valve is conveniently installed in the fluid conveying pipeline through the connecting seat 39.

[0039] Working principle or structural principle, when in use, the one-way valve is installed in the fluid conveying pipeline through the connecting seat 39;

[0040] When the fluid flows forward, the fluid flows into the water inlet channel 32, the second valve core 36 is separated from the second valve seat 38 under the action of the fluid, the third spring 37 is compressed, then the fluid flows upward, the first valve core 15 is separated from the first valve seat 19 under the action of the fluid, the push rod 12 moves upward, the second spring 21 is compressed under the action of the force, when the fluid flows through the first valve seat 19 and moves upward, the fluid pushes the sealing cover 16 upward, the sealing cover 16 moves upward, the first spring 14 is compressed under the action of the force, the sealing cover 16 is separated from the sealing ring 23, at this time, the fluid flows into the sealing cavity 34 through the through slot 17, then flows into the water outlet channel 33, and finally flows into the conveying pipeline;

[0041] When the fluid flows reversely, the first spring 14, the second spring 21 and the third spring 37 are reset, at this time, the first valve core 15 is attached to the first valve seat 19, the bottom of the sealing cavity 34 is sealed, the sealing cover 16 is attached to the sealing ring 23, the sealing gasket 18 is attached to the groove 20 on the first valve seat 19, at this time, the connection gap between the first valve core 15 and the first valve seat 19 can be sealed, and the second valve core 36 is tightly attached to the second valve seat 38, the water inlet channel 32 is sealed, and the backflow of the fluid can be effectively prevented, and the reverse effect of the one-way valve is enhanced;

[0042] When installing the one-way valve with double safety sealing mechanism, attention should be paid to the direction of the water inlet channel 32 and the water outlet channel 33 on the valve body 31 to ensure that the fluid flows in the designed one-way direction through the one-way valve, avoiding reverse installation that may cause the one-way valve to fail. The working temperature range of the one-way valve is -20°C to 80°C, and exceeding this range may affect the performance of the sealing gasket 18, the sealing ring 23, and other sealing components, leading to a decline in sealing effect. During use, it is recommended to regularly check the sealing performance of the one-way valve, such as observing whether there are signs of fluid leakage. Every 3 months, the one-way valve should be maintained comprehensively, including checking the wear of the sealing gasket 18 and the sealing ring 23, replacing them if worn out; checking the elasticity of the first spring 14, the second spring 21, and the third spring 37, and replacing them if their elasticity is weakened or deformed, to ensure the normal operation and reverse prevention effect of the one-way valve.

[0043] The one-way valve with double safety sealing mechanism is suitable for various types of fluids, such as clean water, oil, gas, etc. For fluids containing particulate impurities, it is recommended to install a suitable filter device at the front end of the one-way valve to prevent particulate impurities from entering the valve body, affecting the performance of the sealing components and the normal operation of the one-way valve. For corrosive fluids such as strong acids and strong bases, the sealing gasket 18 and the sealing ring 23 should be made of appropriate materials according to the chemical properties of the fluid, such as using fluorine rubber sealing components to effectively resist the corrosion of strong acids and strong bases. Before use, it is recommended to test the compatibility of the one-way valve with the specific fluid to ensure the sealing performance and service life of the one-way valve.

[0044] When the fluid flows in reverse, the pressure of the fluid acts on the first valve core 15 and the second valve core 36, causing the first spring 14, the second spring 21, and the third spring 37, which were originally compressed, to begin to reset. The first spring 14 pushes the sealing cover 16 downward at a speed of 5mm / s, making the inner top wall of the sealing cover 16 tightly fit with the sealing ring 23, and at the same time, the sealing gasket 18 tightly fits with the inner wall of the groove 20 on the first valve seat 19, achieving sealing of the connection gap between the first valve core 15 and the first valve seat 19. The second spring 21 pushes the push rod 12 downward at a speed of 3mm / s, making the first valve core 15 tightly fit with the first valve seat 19, sealing the bottom of the sealing cavity 34. The third spring 37 pushes the second valve core 36 to tightly fit with the second valve seat 38 at a speed of 4mm / s, sealing the water inlet channel 32. The cooperation precision between the components is controlled within ±0.1mm, ensuring that when the fluid flows in reverse, it can be quickly and effectively prevented from flowing back, enhancing the reverse prevention effect of the one-way valve.

[0045] The adjusting nut 22 is matched with the thread on the top of the inner side wall of the mounting hole 35, and the compression degree of the second spring 21 can be adjusted by rotating the adjusting nut 22 clockwise or counterclockwise. The adjusting range of the adjusting nut 22 is 0-10 turns. When the adjusting nut 22 is rotated clockwise, the second spring 21 is compressed more tightly, the elastic force is increased, the sealing pressure between the first valve core 15 and the first valve seat 19 is increased, and the sealing effect is enhanced. Conversely, when the adjusting nut 22 is rotated counterclockwise, the compression degree of the second spring 21 is reduced, the elastic force is reduced, the sealing pressure between the first valve core 15 and the first valve seat 19 is reduced, and the sealing effect is correspondingly weakened. In this way, the sealing effect of the first valve core 15 and the first valve seat 19 can be accurately adjusted according to different use requirements, and the applicability of the one-way valve is improved.

[0046] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A check valve with a double-safety sealing mechanism, characterized in that, It includes a valve body (31), which has an inlet channel (32), an outlet channel (33), a sealing cavity (34) and a mounting hole (35). The sealing cavity (34) is provided with a sealing assembly (101), which includes a push rod (12), a limiting ring (13), a first spring (14), a first valve core (15), a sealing cover (16), a through groove (17), a sealing gasket (18), and a first valve seat (19). The limiting ring (13) is fixedly connected to the outer wall of the push rod (12), the first spring (14) is sleeved on the outside of the push rod (12), the first valve core (15) is fixedly connected to the bottom end of the push rod (12), the sealing cover (16) is slidably connected to the outer wall of the push rod (12), the through groove (17) is symmetrically opened on the upper surface of the sealing cover (16), the upper surface of the first valve core (15) is fitted with a sealing ring (23), the top of the outer wall of the first valve seat (19) is provided with a groove (20), the sealing gasket (18) is fixedly connected to the lower surface of the sealing cover (16), and the outer wall of the first valve core (15) is attached to the inner wall of the first valve seat (19).

2. A check valve with a double-safety sealing mechanism according to claim 1, characterized in that, The top end of the first spring (14) abuts against the lower surface of the limiting ring (13), and the bottom end of the first spring (14) abuts against the upper surface of the sealing cover (16).

3. A check valve with a double-safety sealing mechanism according to claim 1, characterized in that, The sealing ring (23) is attached to the inner top wall of the sealing cover (16), and the outer side wall of the sealing gasket (18) is attached to the inner side wall of the groove (20).

4. A check valve with a double-safety sealing mechanism according to claim 1, characterized in that, The first valve seat (19) is installed on the inner wall of the sealing cavity (34), which is connected to the inlet channel (32), the outlet channel (33) and the mounting hole (35) respectively.

5. A check valve with a double-safety sealing mechanism according to claim 1, characterized in that, The top of the push rod (12) is fixedly connected to a sliding plate (11), and a second spring (21) is provided on the top of the sliding plate (11).

6. A check valve with a double-safety sealing mechanism according to claim 5, characterized in that, The sliding plate (11) is slidably connected to the inner wall of the mounting hole (35), and the top of the inner wall of the mounting hole (35) is threaded with an adjusting nut (22). The two ends of the second spring (21) press against the sliding plate (11) and the adjusting nut (22) respectively.

7. A check valve with a double-safety sealing mechanism according to claim 1, characterized in that, The water inlet channel (32) is internally provided with a second valve core (36), a third spring (37), and a second valve seat (38); The second valve seat (38) is fixedly connected to the inner wall of the water inlet channel (32), the second valve core (36) is in contact with the second valve seat (38), one end of the third spring (37) presses against the valve body (31), and the other end of the third spring (37) presses against the second valve core (36).

8. A check valve with a double-safety sealing mechanism according to claim 1, characterized in that, Both the inlet channel (32) and the outlet channel (33) are equipped with connecting seats (39).

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