Double-check backflow preventer convenient to disassemble and assemble

Abstract

The double-check backflow preventer convenient to disassemble and assemble comprises a valve body, a first valve seat and a second valve seat, the first valve seat and the second valve seat are connected to the two ends of the valve body in a sealed and inserted mode respectively, the two ends of the valve body are each provided with a quick disassembly assembly, and each quick disassembly assembly comprises a pressing plate movably connected with the valve body. The pressing plate abuts against the head of the first valve seat and the head of the second valve seat, a first valve clack is arranged at the other end of the first valve seat, a first valve rod movably inserted into the first valve seat is connected to the first valve clack, the first valve rod is elastically connected with the first valve seat, and a second valve clack is arranged at the other end of the second valve seat. The second valve clack is connected with a second valve rod movably inserted into the second valve seat, the second valve rod is elastically connected with the second valve seat, and an exhaust valve is installed on the valve body. The valve body, the first valve seat, the second valve seat and the quick release assembly are arranged, so that the machining difficulty is reduced, the difficulty of detaching the first valve seat and the second valve seat is further reduced, and use is more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to backflow preventer technical field, especially in convenient to dismouting's double check backflow preventer. BACKGROUND

[0002] Double check backflow preventer is a kind of device for preventing fluid reverse flow in pipeline, by double check valve structure design, ensure that fluid unidirectional flow, avoid the backflow pollution caused by pressure fluctuation, siphon effect etc., widely used in water supply, fire control, chemical industry etc. field.The existing patent (announcement number: CN218408654 U) discloses a double check backflow preventer, the utility model discloses a first valve seat and third valve seat are set, so that backflow preventer whole is convenient to dismouting, when backflow preventer appears the condition of blockage, so that staff carries out dismounting to carry out maintenance and replacement operation, but in practical application, because valve seat and valve body still adopt the way of threaded connection, and because valve seat is embeddedly connected in valve body interior, it is difficult to dismount and install valve seat in actual operation, it is not conducive to practical application.For this reason, we propose a kind of double check backflow preventer convenient to dismouting. SUMMARY

[0003] To solve the above problems, the utility model provides a kind of double check backflow preventer convenient to dismouting.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] Design a kind of double check backflow preventer convenient to dismouting, including valve body, valve seat one and valve seat two, the valve seat one and valve seat two are respectively sealed and are inserted in valve body both ends, the valve body both ends are equipped with quick release assembly, the quick release assembly includes the pressing plate that is movably connected with valve body, the pressing plate is respectively abutted on valve seat one, valve seat two head, the other end of valve seat one is equipped with valve flap one, the valve rod one that is movably inserted in valve seat one is connected on valve flap one, the valve rod one is elastically connected with valve seat one, the other end of valve seat two is equipped with valve flap two, the valve rod two that is movably inserted in valve seat two is connected on valve flap two, the valve rod two is elastically connected with valve seat two, exhaust valve is installed on the valve body.

[0006] In the above scheme, the valve body one end is equipped with the insertion groove one matched with valve seat one, sealing ring one is installed between valve seat one and insertion groove one.

[0007] In the above scheme, the valve body one end is equipped with the insertion groove two matched with valve seat two, sealing ring three is installed between valve seat two and insertion groove two.

[0008] In the scheme, the valve body end is provided with a rotating groove for accommodating a pressing plate, one end of the pressing plate is connected with the inner wall of the rotating groove through a rotating shaft, the rotating shaft is sleeved with a torsional spring having two ends connected with the pressing plate and the inner wall of the rotating groove respectively, and the torsional spring is a nanocrystalline spring steel torsional spring.

[0009] In the scheme, the valve rod one is sleeved with a spring one, two ends of the spring one are connected with the valve rod one and the valve seat one respectively, and the inner side of the valve flap one is provided with a sealing ring two matched with the valve seat one.

[0010] In the scheme, the valve rod two is sleeved with a spring two, two ends of the spring two are connected with the valve rod two and the valve seat two respectively, and the valve flap two is provided with a sealing ring four matched with the valve seat two.

[0011] In the scheme, the valve rod two is fixed with a flow resistance block near one end of the valve flap one, the flow resistance block is tapered at the end and the tip is directed to the valve flap one, and the valve flap one is provided with a locking groove matched with the flow resistance block.

[0012] In the scheme, the pressing plate is fixed with a locking block, and the valve seat one and the valve seat two are provided with a positioning groove matched with the locking block.

[0013] The valve body, the valve seat one, the valve seat two and the quick release assembly are arranged, the valve seat one and the valve seat two are assembled with the valve body through the plug-in mode, the valve seat one and the valve seat two are tightly pressed in the valve body through the pressing plate, the friction is increased through the increase of the contact surface pressure, the connection degree of the valve seat one, the valve seat two and the valve body is improved, compared with the prior art, the valve seat one and the valve seat two are connected with the valve body through the plug-in mode without the need of machining threads in the valve body, the connection degree is not affected, the machining difficulty is reduced, the difficulty of disassembling the valve seat one and the valve seat two is further reduced, the use is more convenient, the locking block and the positioning groove are arranged, the contact area of the pressing plate and the valve seat one and the valve seat two is increased, the friction of the pressing plate and the valve seat one and the valve seat two is increased, and the stability of the valve seat one and the valve seat two is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 A cross-sectional view of a double check backflow preventer convenient to disassemble and assemble is provided.

[0016] Figure 2 For Figure 1 Structure amplification schematic view at A in the middle;

[0017] Figure 3 The utility model provides a kind of structure schematic view of the pressing plate of the double check backflow preventer of convenient dismounting.

[0018] In the drawing: valve body 1, valve seat one 2, valve seat two 3, valve flap one 4, valve stem one 5, spring one 6, valve flap two 7, valve stem two 8, spring two 9, choke block 10, locking groove 11, exhaust valve 12, quick-release assembly 13, pressing plate 131, locking block 132, rotating shaft 133, torsional spring 134, rotating groove 14, positioning groove 15, plug-in groove one 16, sealing ring one 17, sealing ring two 18, plug-in groove two 19, sealing ring three 20, sealing ring four 21. DETAILED DESCRIPTION

[0019] The specific embodiments of the utility model are further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.

[0020] Please refer to Figures 1-3 The utility model provides a kind of technical scheme: a kind of double check backflow preventer of convenient dismounting, including valve body 1, valve seat one 2 and valve seat two 3, valve seat one 2 and valve seat two 3 are respectively sealed and inserted in the both ends of valve body 1;

[0021] Further, the one end of valve body 1 is provided with plug-in groove one 16 matched with valve seat one 2, and sealing ring one 17 is arranged between valve seat one 2 and plug-in groove one 16;The sealing property between valve body 1 and valve seat one 2 is improved;

[0022] Further, the one end of valve body 1 is provided with plug-in groove two 19 matched with valve seat two 3, and sealing ring three 20 is arranged between valve seat two 3 and plug-in groove two 19;The sealing property between valve body 1 and valve seat two 3 is improved;

[0023] The both ends of valve body 1 are provided with quick-release assembly 13, and quick-release assembly 13 includes pressing plate 131 movably connected with valve body 1, and pressing plate 131 is respectively abutted on the head of valve seat one 2 and valve seat two 3;

[0024] Further, the end of valve body 1 is provided with rotating groove 14 for accommodating pressing plate 131, one end of pressing plate 131 is connected with the inner wall of rotating groove 14 through rotating shaft 133, torsional spring 134 is sleeved on rotating shaft 133, and both ends of torsional spring 134 are connected with pressing plate 131 and the inner wall of rotating groove 14 respectively, torsional spring 134 is nanocrystalline spring steel torsional spring, and the production of torsional spring 134 adopts controlled rolling and controlled cooling and high-pressure shot peening strengthening process, effectively prolongs the service life of torsional spring 134;

[0025] Specifically, by setting the valve body 1, the valve seat one 2, the valve seat two 3 and the quick release assembly 13, the valve seat one 2 and the valve seat two 3 are respectively assembled with the valve body 1 at both ends through the plug-in mode, and the valve seat one 2 and the valve seat two 3 are tightly pressed in the valve body 1 by cooperating with the pressing plate 131, the contact surface pressure is increased to increase the friction, and the connection degree of the valve seat one 2, the valve seat two 3 and the valve body 1 is improved. Compared with the prior art, the valve seat one 2 and the valve seat two 3 are directly connected with the valve seat one 2 and the valve seat two 3 through the plug-in mode without machining threads in the valve body 1, the connection degree is not affected, the machining difficulty is reduced, and the difficulty of disassembling the valve seat one 2 and the valve seat two 3 is further reduced, and the use is more convenient.

[0026] The valve seat one 2 is provided with the valve clack one 4 at the other end, the valve rod one 5 movably inserted in the valve seat one 2 is connected to the valve clack one 4, the valve rod one 5 is elastically connected with the valve seat one 2, the valve seat two 3 is provided with the valve clack two 7 at the other end, the valve rod two 8 movably inserted in the valve seat two 3 is connected to the valve clack two 7, the valve rod two 8 is elastically connected with the valve seat two 3, and the exhaust valve 12 is installed on the valve body 1.

[0027] Further, the spring one 6 is sleeved on the valve rod one 5, the both ends of the spring one 6 are respectively connected with the valve rod one 5 and the valve seat one 2, and the sealing ring two 18 adapted to the valve seat one 2 is installed on the inner side of the valve clack one 4; when the valve clack one 4 and the valve seat one 2 abut tightly, the two are sealed.

[0028] Further, the spring two 9 is sleeved on the valve rod two 8, the both ends of the spring two 9 are respectively connected with the valve rod two 8 and the valve seat two 3, and the sealing ring four 21 adapted to the valve seat two 3 is installed on the valve clack two 7; when the valve clack two 7 and the valve seat two 3 abut tightly, the two are sealed.

[0029] Further, the locking block 132 is fixed on the pressing plate 131, and the head of the valve seat one 2 and the valve seat two 3 is provided with the positioning groove 15 matched with the locking block 132.

[0030] Specifically, by setting the locking block 131 and the positioning groove 15, the contact area of the pressing plate 131 and the valve seat one 2 and the valve seat two 3 is increased, the friction between the pressing plate 131 and the valve seat one 2 and the valve seat two 3 is increased, and the stability of the valve seat one 2 and the valve seat two 3 is further improved.

[0031] Further, the flow resistance block 10 is fixed at one end of the valve rod two 8 close to the valve clack one 4, the end of the flow resistance block 10 is tapered towards the valve clack one 4, and the locking groove 11 matched with the flow resistance block 10 is formed in the valve clack one 4; by cooperation between the flow resistance block 10 and the locking groove 11, the valve rod two 8 is effectively supported by the valve clack one 4 when backflow occurs, and the stability is improved.

[0032] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and 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 double check backflow preventer which is easy to disassemble, comprising a valve body (1), a valve seat one (2) and a valve seat two (3), characterized in that, The valve seat one (2) and the valve seat two (3) are respectively sealed and inserted into the two ends of the valve body (1), both ends of the valve body (1) are provided with quick release assemblies (13), the quick release assemblies (13) include pressure plates (131) movably connected with the valve body (1), the pressure plates (131) are respectively abutted on the head of the valve seat one (2) and the valve seat two (3), the other end of the valve seat one (2) is provided with a valve clack one (4), the valve clack one (4) is connected with a valve rod one (5) movably inserted into the valve seat one (2), the valve rod one (5) is elastically connected with the valve seat one (2), the other end of the valve seat two (3) is provided with a valve clack two (7), the valve clack two (7) is connected with a valve rod two (8) movably inserted into the valve seat two (3), the valve rod two (8) is elastically connected with the valve seat two (3), the valve body (1) is provided with an exhaust valve (12).

2. The dual check backflow preventer of claim 1, wherein: The valve body (1) is provided with an insertion groove one (16) matched with the valve seat one (2) at one end, and a sealing ring one (17) is arranged between the valve seat one (2) and the insertion groove one (16).

3. The dual check backflow preventer of claim 1, wherein: The valve body (1) is provided with an insertion groove two (19) matched with the valve seat two (3) at one end, and a sealing ring three (20) is arranged between the valve seat two (3) and the insertion groove two (19).

4. The dual check backflow preventer of claim 1, wherein: The valve body (1) is provided with a rotating groove (14) for accommodating the pressure plate (131) at the end, one end of the pressure plate (131) is connected with the inner wall of the rotating groove (14) through a rotating shaft (133), the rotating shaft (133) is sleeved with a torsional spring (134) having two ends respectively connected with the pressure plate (131) and the inner wall of the rotating groove (14), and the torsional spring (134) is a nanocrystalline spring steel torsional spring.

5. The dual check backflow preventer of claim 1, wherein: The valve rod one (5) is sleeved with a spring one (6), both ends of the spring one (6) are respectively connected with the valve rod one (5) and the valve seat one (2), and the valve clack one (4) is internally provided with a sealing ring two (18) matched with the valve seat one (2).

6. The dual check backflow preventer of easy removal according to claim 1, characterized in that, The valve rod two (8) is sleeved with a spring two (9), both ends of the spring two (9) are respectively connected with the valve rod two (8) and the valve seat two (3), and the valve clack two (7) is internally provided with a sealing ring four (21) matched with the valve seat two (3).

7. The dual check backflow preventer of easy removal according to claim 1, characterized in that, The valve rod two (8) is fixed with a flow resistance block (10) at one end close to the valve clack one (4), the flow resistance block (10) is tapered at the end and the tip is directed to the valve clack one (4), and the valve clack one (4) is internally provided with a locking groove (11) matched with the flow resistance block (10).

8. The dual check backflow preventer of easy removal according to claim 1, characterized in that, The pressure plate (131) is fixed with a locking block (132), and the head of the valve seat one (2) and the valve seat two (3) are both provided with a positioning groove (15) matched with the locking block (132).

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