Check valve

Abstract

The check valve comprises a valve body, a valve deck, a first spring, a valve rod and a valve clack, an inlet channel, an outlet channel and a sealing groove capable of being matched with the valve clack in a sealing mode are formed in the valve body, a first opening is formed in the top of the valve body, the first spring, the valve rod and the valve clack are arranged at the bottom of the valve deck, and the valve deck is detachably connected with the valve body. The lower side wall and the bottom wall of the valve cover abut against the sealing gasket, a plurality of grooves are formed in the side wall of the sealing groove in the circumferential direction, second springs and marbles are arranged in the grooves, and positioning grooves corresponding to the grooves in a one-to-one mode are formed in the side wall of the valve clack in the circumferential direction. When the valve cover is connected with the valve body, the valve cover, the valve rod, the spring and the valve clack can be taken down together to be cleaned, the step of unscrewing a bolt for disassembly is omitted, and when the valve cover is connected with the valve body, the second spring pushes the marble to bounce into the positioning groove to make bouncing sound, so that the valve clack is accurately reset to be in sealing fit with the sealing groove again.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a check valve. Background Art

[0002] A check valve is a valve whose opening and closing parts are circular discs and which rely on their own weight and medium pressure to produce movement to block the backflow of the medium. It belongs to the category of automatic valves, also known as non-return valves, one-way valves, return valves or isolation valves. The disc movement mode is divided into lift type and swing type. The lift check valve is similar to the stop valve in structure, only lacking the valve stem 3 that drives the disc. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure is greater than the sum of the weight of the disc and its flow resistance, the valve is opened. On the contrary, when the medium flows back, the valve is closed. The swing check valve has a disc that is tilted and can rotate around the axis, and its working principle is similar to that of the lift check valve. Check valves are often used as bottom valves of pumping devices to prevent water backflow. Check valves are used in combination with stop valves to play a role of safety isolation. Check valves can also be used on pipelines that provide supply to auxiliary systems where the pressure may rise to exceed the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).

[0003] After using the existing check valve for a period of time, the following problems may occur: first, when the internal water contains impurities, they are easy to accumulate inside the valve body and cause blockage. If there are impurities adhering to the valve disc, the valve disc will tilt and the inner wall of the valve body cannot fit tightly. In addition, it is difficult to determine whether the valve disc is accurately reset when it is reset, which affects the normal closing of the valve body and even has the risk of valve leakage. Second, the check valve is often fastened with bolts, and the bolts need to be unscrewed for disassembly to clean the internal impurities, which is time-consuming and labor-intensive. When the bolts are rusted, the internal threads of the bolts and the nut are prone to locking. Utility Model Content

[0004] The utility model aims at a check valve to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a check valve, comprising a valve body, a valve cover, a first spring, a valve stem and a valve disc, the valve body is provided with an inlet channel, an outlet channel and a sealing groove that can cooperate with the valve disc seal, the top of the valve body is provided with a first opening, the first spring, the valve stem and the valve disc are arranged at the bottom of the valve cover, a plurality of first connecting components are circumferentially arranged at the lower outer side of the valve cover, a plurality of second connecting components are circumferentially arranged on the upper side wall of the valve body corresponding to the first connecting components, the first connecting component and the second connecting component are detachably connected, the lower side wall and the bottom wall of the valve cover are both in contact with the sealing gasket, the side wall of the sealing groove is provided with a plurality of grooves along the circumferential direction, the second spring and the marble are arranged in the groove, and the side wall of the valve disc is provided with a positioning groove corresponding to the plurality of grooves along the circumferential direction.

[0006] By adopting the above technical scheme, the valve cover and the valve body are detachably connected by setting the first connecting component and the second connecting component. When cleaning is required, the valve cover connecting the valve stem, the spring and the valve disc can be removed together for cleaning, eliminating the step of unscrewing the bolts for disassembly, and avoiding the problem of locking between the internal threads of the bolts and the nuts after the bolts are rusted. When the valve cover is connected to the valve body, the valve stem pushes the valve disc and the sealing groove to achieve sealing under the action of the spring. At the same time, the second spring pushes the marble into the positioning groove, making a bouncing sound, thereby ensuring that the valve disc is accurately reset and the sealing groove is re-sealed, reducing the risk of valve leakage.

[0007] As a further optimization of the utility model, the second connecting component includes a connecting groove opening outward, a third spring arranged in the connecting groove, and a movable rod slidably connected to the connecting groove, the outer end of the movable rod elastically extends out of the connecting groove, and the first connecting component includes a connecting part, a through hole arranged on the connecting part, and a push rod slidably connected to the through hole.

[0008] By adopting the above technical solution, the movable rod is pushed into the through hole by the third spring, so that the connecting part is locked and connected with the valve body. When unlocking is required, the push rod is pushed to slide the movable rod out of the through hole to unlock the valve cover and the valve body.

[0009] As a further optimization of the present invention, a sealing gasket is provided on the top wall of the valve body and the inner wall of the first opening, and the lower side wall and the bottom wall of the valve cover are in contact with the sealing gasket.

[0010] By adopting the above technical solution, the sealing gasket improves the tightness of the connection between the valve body and the valve cover, and enhances the sealing performance.

[0011] As a further optimization of the present invention, the outer end surface of the movable rod is an inclined surface, and the inner end bottom of the connecting part is an inclined surface.

[0012] By adopting the above technical solution, the valve cover is pressed downward when connected to the valve body, and the inclined surface at the bottom of the inner end of the connecting part pushes the inclined surface of the outer end surface of the movable rod, so that the movable rod slides toward the inside of the connecting groove to squeeze the third spring to contract. When the movable rod is aligned with the through hole, the third spring elastically recovers and pushes the movable rod into the through hole.

[0013] As a further optimization of the utility model, a second opening is provided at the bottom of the valve body, and an inclined filter screen is provided above the second opening of the inlet channel, and an internal thread is provided on the inner wall of the second opening; a discharge barrel is also included, and the discharge barrel is provided with an external thread and is threadably connected to the opening.

[0014] By adopting the above technical solution, a filter screen is set to block impurities in the inlet channel to prevent them from adhering to the valve disc. The blocked impurities fall into the discharge barrel under the action of gravity. When cleaning is required, the discharge barrel and the valve body are disassembled.

[0015] The beneficial effects of the utility model are as follows: the valve cover and the valve body are detachably connected by arranging the first connecting component and the second connecting component. When cleaning is needed, the valve cover connecting the valve stem, the spring and the valve disc can be removed together for cleaning, eliminating the step of unscrewing the bolts for disassembly, and avoiding the problem of locking between the internal threads of the bolts and the nuts after the bolts are rusted. When the valve cover is connected to the valve body, the valve stem pushes the valve disc to cooperate with the sealing groove to achieve sealing under the action of the spring. At the same time, the second spring pushes the marble into the positioning groove to make a bouncing sound, thereby ensuring that the valve disc is accurately reset and the sealing groove is re-sealed, reducing the risk of valve leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 for Figure 1 A magnified schematic diagram of

[0018] Figure 3 for Figure 1 A magnified schematic diagram of B.

[0019] The meanings of the numbers in the figure are as follows: 11, valve body; 111, inlet channel; 112, outlet channel; 113, first opening; 114, second opening; 12, valve cover; 13, first spring; 14, valve stem; 15, valve disc; 151, positioning groove; 16, sealing groove; 21, connecting part; 22, through hole; 23, push rod; 31, connecting groove; 32, third spring; 33, movable rod; 4, sealing gasket; 51, groove; 52, second spring; 53, marbles; 6, filter screen; 7, discharge barrel. DETAILED DESCRIPTION

[0020] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0021] See attached Figure 1-3 , the embodiment disclosed in the utility model further provides: a check valve, including a valve body 11, a valve cover 12, a first spring 13, a valve stem 14 and a valve flap 15, wherein the valve body 11 is provided with an inlet channel 111, an outlet channel 112 and a sealing groove 16 capable of sealingly cooperating with the valve flap 15;

[0022] The top of the valve body 11 is provided with a first opening 113, the first spring 13, the valve stem 14 and the valve flap 15 are arranged at the bottom of the valve cover 12, the top wall of the valve body 11 and the inner wall of the first opening 113 are provided with a sealing gasket 4, the lower side wall and the bottom wall of the valve cover 12 are in contact with the sealing gasket 4, and the sealing gasket 4 improves the tightness of the connection between the valve body 11 and the valve cover 12, and enhances the sealing performance;

[0023] A plurality of first connection components are circumferentially arranged at the lower outer side of the valve cover 12, and a plurality of second connection components corresponding to the first connection components are circumferentially arranged on the upper side wall of the valve body 11, and the first connection component and the second connection component are detachably connected. Specifically, the second connection component includes a connection groove 31 opening outward, a third spring 32 arranged in the connection groove 31, and a movable rod 33 slidably connected to the connection groove 31, and the outer end of the movable rod 33 elastically extends out of the connection groove 31. The first connection component includes a connection portion 21, a through hole 22 arranged on the connection portion 21, and a push rod 23 slidably connected to the through hole 22. Further, the outer end surface of the movable rod 33 is an inclined surface, and the inner end bottom of the connection portion 21 is an inclined surface;

[0024] The lower side wall and bottom wall of the valve cover 12 are in contact with the sealing gasket 4. The side wall of the sealing groove 16 is provided with a plurality of grooves 51 along the circumferential direction. The second spring 52 and the marble 53 are arranged in the groove 51. The side wall of the valve flap 15 is provided with positioning grooves 151 corresponding to the plurality of grooves 51 along the circumferential direction.

[0025] Furthermore, a second opening 114 is provided at the bottom of the valve body 11, and an inclined filter screen 6 is provided above the second opening 114. The inner wall of the second opening 114 is provided with an internal thread; a discharge barrel 7 is also included, which is provided with an external thread and is threadedly connected to the opening.

[0026] The principle of the utility model is as follows: the valve cover 12 and the valve body 11 are detachably connected by setting a first connecting component and a second connecting component. When the valve cover 12 and the valve body 11 are connected, they are pressed downward, and the inclined surface of the bottom of the inner end of the connecting portion 21 pushes the inclined surface of the outer end surface of the movable rod 33, so that the movable rod 33 slides toward the inner side of the connecting groove 31 to squeeze the third spring 32 to contract. When the movable rod 33 is aligned with the through hole 22, the third spring 32 elastically restores and pushes the movable rod 33 into the through hole 22, so that the connecting portion 21 and the valve body 11 are locked and connected. When unlocking is required, the push rod 23 is slid to push and slide the movable rod 33 out of the through hole 22, so as to unlock the valve cover 12 and the valve body 11.

[0027] When cleaning is required, the valve cover 12, valve stem 14, spring and valve disc 15 can be removed together for cleaning, eliminating the step of unscrewing the bolts for disassembly, and avoiding the problem of locking between the internal threads of the bolts and the nuts after the bolts are rusted. When the valve cover 12 is connected to the valve body 11, the valve stem 14 pushes the valve disc 15 to cooperate with the sealing groove 16 to achieve sealing under the action of the spring, and at the same time, the second spring 52 pushes the marble 53 to bounce into the positioning groove 151, making a bouncing sound, thereby ensuring that the valve disc 15 is accurately reset and re-sealed with the sealing groove 16, reducing the risk of valve leakage;

[0028] The filter screen 6 is provided to block the impurities in the inlet channel 111 to prevent them from adhering to the valve flap 15 . The blocked impurities fall into the discharge barrel 7 under the action of gravity. When cleaning is required, the discharge barrel 7 and the valve body 11 are disassembled.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A check valve, comprising a valve body (11), a valve cover (12), a first spring (13), a valve stem (14) and a valve flap (15), wherein the valve body (11) is provided with an inlet channel (111), an outlet channel (112) and a sealing groove (16) capable of sealingly cooperating with the valve flap (15), characterized in that: The top of the valve body (11) is provided with a first opening (113), the first spring (13), the valve stem (14) and the valve flap (15) are arranged at the bottom of the valve cover (12), and a plurality of first connecting components are circumferentially provided at the lower outer side of the valve cover (12), and a plurality of second connecting components are circumferentially provided on the upper side wall of the valve body (11) and are arranged one-to-one with the first connecting components, and the first connecting component and the second connecting component are detachably connected, and the lower side wall and the bottom wall of the valve cover (12) are both in contact with the sealing gasket (4), and the side wall of the sealing groove (16) is provided with a plurality of grooves (51) along the circumferential direction, and a second spring (52) and a marble (53) are arranged in the groove (51), and the side wall of the valve flap (15) is provided with a positioning groove (151) along the circumferential direction and is arranged one-to-one with the plurality of grooves (51).

2. A check valve according to claim 1, characterized in that: The second connecting component comprises a connecting groove (31) opening outward, a third spring (32) arranged in the connecting groove (31), and a movable rod (33) slidably connected to the connecting groove (31), the outer end of the movable rod (33) elastically extending out of the connecting groove (31), and the first connecting component comprises a connecting portion (21), a through hole (22) arranged on the connecting portion (21), and a push rod (23) slidably connected to the through hole (22).

3. A check valve according to claim 1, characterized in that: The top wall of the valve body (11) and the inner wall of the first opening (113) are both provided with a sealing gasket (4), and the lower side wall and the bottom wall of the valve cover (12) are both in contact with the sealing gasket (4).

4. A check valve according to claim 2, characterized in that: The outer end surface of the movable rod (33) is an inclined surface, and the inner end bottom of the connecting portion (21) is an inclined surface.

5. A check valve according to claim 1, characterized in that: The bottom of the valve body (11) is provided with a second opening (114), the inlet channel (111) is provided with a filter screen (6) above the second opening (114), and the inner wall of the second opening (114) is provided with an internal thread; and a discharge barrel (7) is also included, the discharge barrel (7) is provided with an external thread and is threadably connected to the opening.

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