Backflow prevention check valve

Abstract

The utility model relates to the technical field of check valves, in particular to an anti-backflow check valve. According to the technical scheme, the valve comprises a valve body, a liquid outlet pipe and a liquid inlet pipe are connected to the positions, close to the upper surface and the lower surface, of the outer surface of the valve body respectively, a limiting ring is installed in the valve body and located between the liquid inlet pipe and the liquid outlet pipe, and a conical sealing hole is formed in the position, close to the upper surface, of the inner wall of the limiting ring; a fixing ring is installed at the position, above the limiting ring, in the valve body, a valve rod is inserted into the fixing ring, the bottom end of the valve rod is connected with a conical valve clack, a spiral spring is spirally wound on the outer surface of the valve rod, a sealing plate is installed on the upper surface of the valve body, and a fixing frame is installed on the upper surface of the sealing plate; and a nut is mounted on the upper surface of the fixing frame. When the valve clack cannot be automatically closed, the valve clack can be manually closed, backflow of liquid in a pipeline is interrupted in time, meanwhile, the flow of the liquid in the pipeline can be controlled according to requirements, and applicability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to check valve technical field, concretely is a kind of anti-backflow check valve. BACKGROUND

[0002] Check valve is a kind of automatic valve, is prevented medium backflow by the automatic opening and closing of valve clapper, ensure that medium can only flow in one direction, so it is widely used in various pipeline systems, is important equipment to prevent medium backflow.

[0003] The check valve of the prior art cannot be closed automatically, which results in the failure of check function, so that the backflow of liquid in the pipeline cannot be interrupted in time. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of anti-backflow check valve, with the advantages that valve clapper can be manually closed when it cannot be automatically closed, interrupt the backflow of liquid in the pipeline in time, and simultaneously can control the flow of liquid in the pipeline according to demand, improve applicability, solve the problem that the check valve of the prior art cannot be closed automatically in the process of use, which results in the failure of check function, so that the backflow of liquid in the pipeline cannot be interrupted in time.

[0005] To achieve the above object, the utility model provides the following technical scheme: an anti-backflow check valve, including valve body, the outer surface of the valve body is connected with liquid outlet pipe and liquid inlet pipe respectively at the position close to upper surface and lower surface, the limit ring is installed between liquid inlet pipe and liquid outlet pipe in the valve body, the inner wall of the limit ring is provided with conical sealing hole at the position close to upper surface, the fixed ring is installed in the valve body and is located at the position above limit ring, the valve rod is inserted into the fixed ring, and the conical valve clapper is connected to the bottom end of valve rod, the spiral spring is spirally wound on the outer surface of valve rod, the sealing plate is installed on the upper surface of valve body, the fixed frame is installed on the upper surface of sealing plate, the nut is installed on the upper surface of fixed frame, the screw rod is inserted into the nut, the sliding rod is connected to the bottom end of screw rod, and the sliding rod penetrates sealing plate.

[0006] Preferably, the inner wall of the limit ring is provided with conical flow guide hole at the position close to lower surface, which guides the liquid passing through the limit ring after entering the valve body, so that the liquid can pass through the limit ring better.

[0007] Preferably, the top end of the screw rod is connected with hand wheel, and the screw rod is rotated by the hand wheel.

[0008] Preferably, the upper surface of the sealing plate is provided with a through hole, the slide rod passes through the through hole, an annular groove is arranged on the inner wall of the through hole, and a sealing ring is arranged in the annular groove and sleeved on the outer surface of the slide rod to prevent liquid from flowing out of the through hole.

[0009] Preferably, the top end of the valve rod is provided with a positioning slot, and after the bottom end of the slide rod is inserted into the positioning slot, the valve rod can be better pushed or limited.

[0010] Preferably, the inner wall of the positioning slot is provided with a round corner near the upper surface, and the round corner facilitates the insertion of the bottom end of the slide rod into the positioning slot.

[0011] Preferably, the sealing plate and the valve body are connected through bolts, so that the sealing plate is convenient to disassemble and assemble, and the valve body is convenient to maintain.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. The utility model discloses a valve body, a limiting ring, a conical sealing hole, a conical valve clack, a valve rod, a fixed ring, a spiral spring, a sealing plate, a screw rod, a slide rod and a nut are arranged, when the valve clack cannot be automatically closed, the valve clack can be manually closed, the liquid flow in the pipeline is interrupted in time, the liquid flow in the pipeline can be controlled according to requirements, the applicability is improved, when the liquid flows into the liquid pipe and enters the valve body, the conical valve clack is pressed when passing through the limiting ring, the conical valve clack rises, the spiral spring is compressed, the liquid passes through the gap between the conical valve clack and the conical sealing hole and then flows out of the liquid outlet pipe, when the liquid inlet pipe stops feeding liquid, the compressed spiral spring releases, the conical valve clack descends and is inserted into the conical sealing hole and is sealed and closed, so that the liquid does not flow backward through the limiting ring, when the conical valve clack cannot be closed, the screw rod is rotated to drive the slide rod to descend, the slide rod pushes the valve rod to drive the conical valve clack to descend, the conical valve clack is forced to descend and is inserted into the conical sealing hole and is sealed and closed, so that the valve clack is manually closed, the liquid flow in the pipeline is interrupted in time, and the height of the valve rod can be limited through the slide rod, that is, the gap between the conical valve clack and the conical sealing hole is controlled, so that the liquid flow through the limiting ring is controlled.

[0014] 2. The utility model discloses a positioning slot and a round corner, the slide rod can better push the valve rod or limit the valve rod, when the screw rod drives the slide rod to descend, the round corner facilitates the insertion of the bottom end of the slide rod into the positioning slot, so that the slide rod can better push the valve rod or limit the valve rod.

[0015] 3. The utility model discloses a conical flow guide hole is set up, and after the liquid enters the inside of valve body, the liquid that crosses the limiting ring is guided to facilitate the liquid to cross the limiting ring better. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0017] Figure 2 It is the three-dimensional structure schematic diagram of the utility model valve body partial;

[0018] Figure 3 It is the three-dimensional structure schematic diagram of the utility model Figure 2 It is the enlarged structure schematic diagram of A of the utility model;

[0019] Figure 4 It is the enlarged structure schematic diagram of B of the utility model Figure 2 .

[0020] Reference Signs: 1, liquid inlet pipe, 2, valve body, 3, sealing plate, 4, fixed frame, 5, nut, 6, screw rod, 7, hand wheel, 8, liquid outlet pipe, 9, limiting ring, 10, conical valve clack, 11, valve stem, 12, slide rod, 13, fixed ring, 14, spiral spring, 15, conical sealing hole, 16, conical flow guide hole, 17, positioning slot, 18, round angle, 19, through insertion hole, 20, annular recess, 21, sealing ring. DETAILED DESCRIPTION

[0021] The technical scheme of the utility model will be further explained below in combination with the drawings and specific embodiments.

[0022] Embodiment one

[0023] As Figure 1 , Figure 2 and Figure 4As shown, the utility model provides a kind of anti-backflow check valve, including valve body 2, the outer surface of valve body 2 is close to the position of upper surface and lower surface respectively connected with liquid outlet pipe 8 and liquid inlet pipe 1, and the limit ring 9 of being installed between liquid inlet pipe 1 and liquid outlet pipe 8 is positioned in the inside of valve body 2, liquid flows into liquid inlet pipe 1 to the inside of valve body 2, and after passing through limit ring 9, it is discharged from liquid outlet pipe 8, and the inner wall of limit ring 9 is close to the position of upper surface and is provided with conical sealing hole 15, fixed ring 13 is installed in the inside of valve body 2 and is positioned in the position above limit ring 9, valve rod 11 is inserted into the inside of fixed ring 13, and conical valve clack 10 is connected to the bottom end of valve rod 11, conical valve clack 10 and conical sealing hole 15 are adapted, when conical valve clack 10 is inserted into the inside of conical sealing hole 15, and the outer surface of conical valve clack 10 and the inner wall of conical sealing hole 15 contact, then liquid can be blocked to pass through limit ring 9, and similarly when conical valve clack 10 and conical sealing hole 15 are separated, then liquid flows through the gap between conical valve clack 10 and conical sealing hole 15.

[0024] Spiral spring 14 is spirally wound on the outer surface of valve rod 11, and spiral spring 14 is located between fixed ring 13 and conical valve clack 10, sealing plate 3 is installed on the upper surface of valve body 2, and sealing plate 3 and valve body 2 are connected by bolt, so as to facilitate the disassembly and assembly of sealing plate 3, and the maintenance and maintenance of the inside of valve body 2, fixed frame 4 is installed on the upper surface of sealing plate 3, nut 5 is installed on the upper surface of fixed frame 4, screw rod 6 is inserted into the inside of nut 5, hand wheel 7 is connected to the top end of screw rod 6, and screw rod 6 bottom end is connected with slide rod 12, and slide rod 12 penetrates sealing plate 3, and through insertion hole 19 is provided on the upper surface of sealing plate 3, and slide rod 12 passes through through insertion hole 19, annular groove 20 is arranged on the inner wall of through insertion hole 19, sealing ring 21 is installed in the inside of annular groove 20, and sealing ring 21 is sleeved on the outer surface of slide rod 12, sealing ring 21 plays the role of sealing, to prevent liquid from flowing out of through insertion hole 19.

[0025] The utility model discloses when using, liquid flows into liquid pipe 1 to enter the inside of valve body 2, when passing the limiting ring 9 to the pressure of conical valve 10, make conical valve 10 rise, and spiral spring 14 compression, then liquid passes between conical valve 10 and conical sealing hole 15, and then from liquid outlet pipe 8, and when liquid inlet pipe 1 stops liquid, the compressed spiral spring 14 releases, makes conical valve 10 drop and insert into conical sealing hole 15 inside and seal close, prevent liquid from passing limiting ring 9 and appear the reverse flow phenomenon, and when conical valve 10 can not close, through the screw rod 6 rotation drive slide rod 12 drop, slide rod 12 push valve rod 11 drive conical valve 10 drop, force conical valve 10 drop and insert into conical sealing hole 15 inside and seal close, reach the purpose of manual closing, timely interrupt the reverse flow of liquid in pipeline, and through slide rod 12 can limit the height of valve rod 11 rise, that is control the gap size between conical valve 10 and conical sealing hole 15, control liquid flow through limiting ring 9.

[0026] Example two

[0027] As Figures 1-4 The utility model discloses a kind of anti-backflow check valves, compared to example one, this embodiment further include that limiting ring 9 inner wall is close to the position of lower surface and set conical flow guide hole 16, after liquid enters the inside of valve body 2, conical flow guide hole 16 plays a guiding role to the liquid passing limiting ring 9, to facilitate liquid to pass limiting ring 9 better, valve rod 11 top is provided with positioning slot 17, positioning slot 17 inner wall is close to the position of upper surface and equipped with round corner 18.

[0028] In this embodiment, when screw rod 6 drive slide rod 12 drop, the setting of round corner 18 facilitates slide rod 12 bottom end to insert into the inside of positioning slot 17, then slide rod 12 can better push valve rod 11, or limit the effect to valve rod 11.

[0029] The above specific embodiment is only several preferred embodiments of the utility model, based on the technical scheme of the utility model and the related enlightenment of the above embodiment, the person skilled in the art can make multiple alternative improvements and combinations to the above specific embodiment.

Claims

1. A backflow preventing check valve comprising a valve body (2), characterized in that: The outer surface of the valve body (2) is connected with the liquid outlet pipe (8) and the liquid inlet pipe (1) near the upper surface and the lower surface respectively, the limit ring (9) is installed between the liquid inlet pipe (1) and the liquid outlet pipe (8) in the valve body (2), the conical sealing hole (15) is arranged on the inner wall of the limit ring (9) near the upper surface, the fixed ring (13) is installed above the limit ring (9) in the valve body (2), the valve rod (11) is inserted into the fixed ring (13), the conical valve clack (10) is connected with the bottom end of the valve rod (11), the helical spring (14) is spirally wound on the outer surface of the valve rod (11), the sealing plate (3) is installed on the upper surface of the valve body (2), the fixed frame (4) is installed on the upper surface of the sealing plate (3), the nut (5) is installed on the upper surface of the fixed frame (4), the screw rod (6) is inserted into the nut (5), the slide rod (12) is connected with the bottom end of the screw rod (6), and the slide rod (12) penetrates through the sealing plate (3).

2. A backflow preventing check valve according to claim 1, characterized in that: The conical flow guide hole (16) is arranged on the inner wall of the limit ring (9) near the lower surface.

3. A backflow preventing check valve according to claim 1, wherein: The hand wheel (7) is connected with the top end of the screw rod (6).

4. A backflow preventing check valve according to claim 1, wherein: The through insertion hole (19) is arranged on the upper surface of the sealing plate (3), the slide rod (12) penetrates through the through insertion hole (19), the annular groove (20) is arranged on the inner wall of the through insertion hole (19), the sealing ring (21) is installed in the annular groove (20), and the sealing ring (21) is sleeved on the outer surface of the slide rod (12).

5. A backflow preventing check valve according to claim 1, wherein: The positioning insertion slot (17) is arranged on the top end of the valve rod (11).

6. A backflow preventing check valve according to claim 5, wherein: The fillet (18) is arranged on the inner wall of the positioning insertion slot (17) near the upper surface.

7. A backflow preventing check valve according to claim 1, wherein: The sealing plate (3) and the valve body (2) are connected through bolts.

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