CN216895926U - Low-resistance backflow preventer - Google Patents

Abstract

The utility model belongs to the technical field of valves and discloses a low-resistance backflow preventer. The low resistance backflow preventer includes a main valve body, a water inlet check valve and a water outlet check valve. The main valve body is detachably connected with a valve cover. The water inlet check valve, the water outlet check valve and the drain valve are arranged in the main valve body. The water escape valve comprises a valve rod, the valve rod penetrates through the middle cavity, one end of the valve rod extends into the control chamber, and the other end of the valve rod extends to the water escape opening. The diaphragm of valve rod one end divides the control chamber into water inlet control room and play water control room, and the other end is connected with the spring and is equipped with the valve plate. When the pressure of the water inlet cavity is greater than the pressure of the water outlet cavity, the water escape valve is in a closed state; when the pressure of the water inlet cavity is less than or equal to the pressure of the water outlet cavity, the water release valve is in an opening state. The low-resistance backflow preventer adopts a built-in control pipeline, and can reduce the frequency of assembling and disassembling components, thereby improving the working efficiency during installation, maintenance or overhaul.

Description

Low-resistance backflow preventer

Technical Field

The utility model relates to the technical field of valves, in particular to a low-resistance backflow preventer.

Background

The low resistance backflow preventer is a hydraulic control assembly for limiting the pressure water in the pipeline to flow only in one direction, and has two independent water inlet check valves, two independent water outlet check valves and a water escape valve for controlling the safety of the fluid. The low resistance backflow preventer has a long service life, is reliable in operation, and is automatically controlled, so that frequent and delicate maintenance is not required on the premise of avoiding human damage or frostbite in general. However, when a failure such as a leak is found, a maintenance work is required. Maintenance is performed by skilled technicians and care should be taken to avoid confusion with the parts of the valve block.

In addition, when the low-resistance backflow preventer is installed, maintained or overhauled, the whole low-resistance backflow preventer needs to be detached from the pipeline, and the parts are assembled and disassembled for many times, so that the operation steps are multiple, and the working efficiency is low.

Therefore, it is desirable to provide a low resistance backflow preventer to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a low-resistance backflow preventer, which adopts a built-in control pipeline, is not easy to damage, can reduce the frequency of assembling and disassembling components and further improves the working efficiency during installation, maintenance or overhaul.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a low resistance backflow preventer comprising:

the main valve body is provided with a water drainage port, and a valve cover is detachably connected to the main valve body and forms a control chamber together with the valve cover;

the water inlet check valve is arranged inside the main valve body and forms a water inlet cavity together with the main valve body;

the water outlet check valve is arranged in the main valve body and forms a water outlet cavity together with the main valve body, and an intermediate cavity is formed between the water inlet check valve and the water outlet check valve;

the water drain valve is arranged in the main valve body and comprises a valve rod, the valve rod penetrates through the middle cavity, one end of the valve rod extends into the control chamber, and the other end of the valve rod extends to the water drain opening; a diaphragm is sleeved at one end extending into the control chamber, the diaphragm divides the control chamber into a water inlet control chamber and a water outlet control chamber, the water inlet control chamber is communicated with the water inlet cavity through a water inlet channel, and the water outlet control chamber is communicated with the water outlet cavity through a water outlet channel; one end extending to the water outlet is connected with a spring and sleeved with a valve plate;

when the pressure of the water inlet cavity is greater than the pressure of the water outlet cavity, the pressure of the water inlet control chamber is greater than the sum of the elastic force of a spring and the pressure of the water outlet control chamber, the valve plate seals the water outlet, and the water drain valve is in a closed state;

when the pressure of the water inlet cavity is smaller than or equal to the pressure of the water outlet cavity, the pressure of the water inlet control chamber is smaller than the sum of the elastic force of the spring and the pressure of the water outlet control chamber, the valve plate is far away from the water drainage opening, and the water drainage valve is in an open state.

Optionally, the diaphragm is clamped between the main valve body and the valve cover, and the water inlet control chamber is formed between the valve cover and the diaphragm.

Optionally, an emergency screw is arranged on the valve cover, and the emergency screw can abut against the valve rod to seal the water drainage opening.

Optionally, emergent screw with be provided with the movable block between the valve rod, the lateral wall of movable block with the inside wall laminating of valve gap, screw emergent screw can make the movable block supports the valve rod.

Optionally, a valve seat fixedly connected to the main valve body is disposed at the drain opening, the valve seat has a first port and a second port, the second port is communicated with the drain opening, and the valve plate can seal the first port to prevent the medium from flowing out of the second port.

Optionally, a guide sleeve is arranged between the valve plate and the spring, and the outer wall of the guide sleeve is attached to the inner wall of the valve seat.

Optionally, the one end that the valve rod was kept away from to the spring is provided with the spring adjustable ring, the outer wall of spring adjustable ring with the inner wall laminating of disk seat.

Optionally, the valve rod comprises a first valve rod and a second valve rod, and the first valve rod and the second valve rod are fixedly connected through a connecting assembly.

Optionally, coupling assembling includes the base, the gland reaches to the ring, it establishes to open the adjacent cover of ring and gland on the valve rod, a pot head of base is established on the second valve rod, another pot head is established open the ring and reach on the gland, and with the gland joint.

Optionally, a filter screen is arranged in the middle cavity, and the filter screen is sleeved outside the valve plate and fixedly connected with the main valve body, so as to prevent impurities from flowing through the sealing surface of the valve plate.

Has the advantages that:

the low-resistance backflow preventer provided by the utility model has the advantage that the purpose of preventing the medium from flowing backwards is achieved by arranging the water inlet check valve, the water outlet check valve and the water drain valve. Through setting up the main valve body and dismantling the valve gap of connection, can set up water inlet check valve, play water check valve and outlet valve in the inside of the main valve body, need not external control pipeline, convenient assembling, it is not fragile. Wherein, the check valve that intakes forms the intake antrum with the main valve body, goes out the water cavity of water check valve and main valve body formation, forms the intermediate chamber between check valve that intakes and go out the water check valve. The water release valve comprises a valve rod, a control chamber is further arranged in the main valve body, the valve rod penetrates through the middle cavity, one end of the valve rod extends into the control chamber, and the control chamber is divided into a water inlet control chamber and a water outlet control chamber through a diaphragm sleeved on the valve rod. The inlet control chamber is in communication with the inlet chamber through the inlet conduit, such that the inlet control chamber pressure P1 and the inlet chamber pressure P1 are equal, and the outlet control chamber is in communication with the outlet chamber through the outlet conduit, such that the outlet control chamber pressure P3 and the outlet chamber pressure P3 are equal. The other end of the valve rod is abutted to the spring and extends to a water outlet on the main valve body, and the water outlet can be sealed by the valve plate sleeved on the valve rod. When the pressure P1 in the water inlet control chamber is higher than the pressure P3 in the water outlet control chamber, the sum of the pressure P3 in the water outlet control chamber and the elastic force F1 in the spring is lower than the pressure P1 in the water inlet control chamber, so that the valve plate seals the water outlet, the water inlet check valve and the water outlet check valve are opened, and the medium flows from the water inlet to the water outlet through the middle cavity. When the pressure P1 of the water inlet cavity is less than or equal to the pressure P3 of the water outlet cavity, the pressure P1 of the water inlet control chamber is less than or equal to the pressure P3 of the water outlet control chamber, at the moment, under the action of the diaphragm and the spring, the valve rod drives the valve plate to move towards the direction far away from the water discharge opening, the medium of the middle cavity flows out from the water discharge opening, the water inlet check valve and the water outlet check valve are closed, and the medium is prevented from flowing backwards.

Drawings

FIG. 1 is a schematic view showing the construction of a low resistance backflow preventer according to the present invention.

In the figure:

100. a main valve body; 110. a valve cover; 120. a water discharge opening; 200. a water inlet check valve; 210. a water inlet cavity; 220. a middle cavity; 300. a water outlet check valve; 310. a water outlet cavity; 400. a water drain valve; 401. a valve stem; 402. a membrane; 403. a spring; 404. a valve plate; 405. an emergency screw; 406. a movable block; 407. a valve seat; 408. a guide sleeve; 409. a spring adjusting ring; 410. a base; 411. a gland; 412. opening the ring; 413. a filter screen; 414. a water inlet control chamber; 415. a water inlet channel; 416. a water outlet control chamber; 417. and a water outlet channel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Fig. 1 is a schematic structural view of the low resistance backflow preventer provided in this embodiment. Referring to fig. 1, the low resistance backflow preventer includes a main valve body 100, a water inlet check valve 200, and a water outlet check valve 300. A valve cover 110 is detachably connected to the main valve body 100, the main valve body 100 is provided with a drain opening 120, and the valve body and the valve cover 110 are connected to form a control chamber. The water inlet check valve 200 is disposed inside the main valve body 100, and forms a water inlet chamber 210 with the main valve body 100. The outlet check valve 300 is disposed within the main valve body 100 and forms an outlet chamber 310 with the main valve body 100, and an intermediate chamber 220 is formed between the inlet check valve 200 and the outlet check valve 300. The drain valve 400 is arranged in the main valve body 100, the drain valve 400 comprises a valve rod 401, the valve rod 401 penetrates through the middle cavity 220, one end of the valve rod extends into the control chamber, and the other end of the valve rod extends to the drain opening 120; one end extending into the control chamber is sleeved with a diaphragm 402, the diaphragm 402 divides the control chamber into a water inlet control chamber 414 and a water outlet control chamber 416, the water inlet control chamber 414 is communicated with the water inlet cavity 210 through a water inlet passage 415, and the water outlet control chamber 416 is communicated with the water outlet cavity 310 through a water outlet passage 417; one end extending to the drain opening 120 is connected with a spring 403 and sleeved with a valve plate 404. When the pressure P1 of the water inlet cavity 210 is greater than the pressure P3 of the water outlet cavity 310, the pressure P1 of the water inlet control chamber 414 is greater than the sum of the elastic force of the spring 403 and the pressure P3 of the water outlet control chamber 416, the valve plate 404 seals the water outlet 120, and the water drain valve 400 is in a closed state; when the pressure P1 of the inlet chamber 210 is less than or equal to the pressure P3 of the outlet chamber 310, the pressure P1 of the inlet control chamber 414 is less than the sum of the spring force of the spring 403 and the pressure P3 of the outlet control chamber 416, the valve plate 404 is away from the drain opening 120, and the drain valve 400 is in an open state.

The low resistance backflow preventer serves to prevent the backflow of the medium by providing the inlet check valve 200, the outlet check valve 300, and the drain valve 400. Through setting up the main valve body 100 and the valve gap 110 of dismantling the connection, can set up the check valve 200 of intaking, play water check valve 300 and outlet valve 400 in the inside of the main valve body 100, need not external control pipeline, convenient assembling, it is not fragile. Wherein, the inlet check valve 200 and the main valve body 100 form an inlet chamber 210, the outlet check valve 300 and the main valve body 100 form an outlet chamber 310, and an intermediate chamber 220 is formed between the inlet check valve 200 and the outlet check valve 300. The drain valve 400 comprises a valve rod 401, a control chamber is further arranged in the main valve body 100, the valve rod 401 penetrates through the middle cavity 220, one end of the valve rod extends into the control chamber, and the control chamber is divided into a water inlet control chamber 414 and a water outlet control chamber 416 through a diaphragm 402 sleeved on the valve rod 401. The inlet control chamber 414 communicates with the inlet chamber 210 via the inlet conduit such that the pressure P1 in the inlet control chamber 414 is equal to the pressure P1 in the inlet chamber 210, and the outlet control chamber 416 communicates with the outlet chamber 310 via the outlet conduit such that the pressure P3 in the outlet control chamber 416 is equal to the pressure P3 in the outlet chamber 310. The other end of the valve rod 401 abuts against the spring 403 and extends toward the drain opening 120 of the main valve body 100, and the drain opening 120 can be sealed by the valve plate 404 fitted around the valve rod 401. When the pressure P1 in the inlet control chamber 414 is greater than the pressure P3 in the outlet control chamber 416, the sum of the pressure P3 in the outlet control chamber 416 and the spring force F1 of the spring 403 is less than the pressure P1 in the inlet control chamber 414, so that the valve plate 404 seals the outlet 120, the inlet check valve 200 and the outlet check valve 300 open, and the media flows from the inlet chamber 210 to the outlet chamber 310 through the intermediate chamber 220. When the pressure P1 of the water inlet cavity 210 is less than or equal to the pressure P3 of the water outlet cavity 310, the pressure P1 of the water inlet control chamber 414 is less than or equal to the pressure P3 of the water outlet control chamber 416, at this time, under the action of the diaphragm 402 and the spring 403, the valve rod 401 drives the valve plate 404 to move in the direction away from the water discharge opening 120, the medium in the middle cavity 220 flows out from the water discharge opening 120, and the water inlet check valve 200 and the water outlet check valve 300 are closed to prevent the medium from flowing backwards.

With continued reference to fig. 1, a bonnet 110 is disposed above the main valve body 100 and is removably coupled to the main valve body 100 by bolts. The top of the bonnet 110 has a recess, and the diaphragm 402 is sandwiched between the bonnet 110 and the main valve body 100 to form a water inlet control chamber 414 with the bonnet 110. The side wall of the valve cover 110 is provided with a passage which is communicated with a water inlet passage 415 arranged on the main valve body 100, so that the water inlet cavity 210 is communicated with the water inlet control chamber 414.

Further, the top of the valve cover 110 is provided with an emergency screw 405, the emergency screw 405 is coaxially arranged with the valve rod 401, and when the valve group fails, the emergency screw 405 can abut against the valve rod 401 to seal the water discharge opening 120, so that the water discharge valve 400 is forcibly closed.

Further, a movable block 406 is arranged between the emergency screw 405 and the valve rod 401, the outer side wall of the movable block 406 is attached to the inner side wall of the valve cover 110, and the movable block 406 can be abutted against the valve rod 401 by screwing the emergency screw 405. Optionally, the recess and the valve rod 401 on the valve gap 110 are coaxial, the movable block 406 is arranged in the recess, the outer wall is attached to the side wall of the recess and is abutted to the emergency screw 405, when abnormal water leakage occurs in the low-resistance backflow preventer and the maintenance cannot be arranged, the emergency screw 405 can be screwed temporarily, when the emergency screw 405 is screwed, the movable block 406 moves downwards to abut against the valve rod 401, so that the valve rod 401 and the valve plate 404 cannot move upwards, and the drain valve 400 is forcibly closed.

Further, the drain valve 400 further includes a valve seat 407, and the valve seat 407 is disposed at the drain opening 120 and fixedly connected to the main valve body 100. The valve seat 407 is substantially tubular and has a first port and a second port, the second port communicating with the drain opening 120, and when the drain valve 400 is closed, the valve plate 404 overlaps the first port to seal the first port and prevent the medium from flowing out of the second port. The outer wall of the valve seat 407 and the inner wall of the main valve body 100 are attached and hermetically connected.

Further, a guide sleeve 408 is disposed between the valve plate 404 and the spring 403, and an outer wall of the guide sleeve 408 is fitted to an inner wall of the valve seat 407. When the drain valve 400 is opened, the spring 403 pushes the guide sleeve 408 to move upwards along the inner wall of the valve seat 407, and the guide sleeve 408 is arranged to ensure that the spring 403 and the valve plate 404 move along the central axis of the valve rod 401.

The end of the spring 403 remote from the valve rod 401 is connected with a spring adjusting ring 409, and the outer wall of the spring adjusting ring 409 is attached to the inner wall of the valve seat 407. The spring adjustment ring 409 can adjust the force of the spring 403 on the valve plate 404, thereby eliminating manufacturing errors and ensuring that the water release valve 400 can be opened quickly when the pressure P3 in the water outlet chamber 310 is greater than the pressure P1 in the water inlet chamber 210.

Be provided with filter screen 413 in the intermediate chamber 220, filter screen 413 cover is established outside valve plate 404, and main valve body 100 fixed connection, and when the medium flow direction filter screen 413 of intermediate chamber 220, impurity wherein can be blockked by filter screen 413, prevents that impurity from flowing to the sealed face of valve plate 404 and valve seat 407, leads to influencing the leakproofness of valve plate 404, causes abnormal leakage.

Further, the valve stem 401 includes a first valve stem and a second valve stem, and the first valve stem and the second valve stem are fixedly connected through a connecting assembly. Specifically, the connecting assembly includes a base 410, a gland 411 and a split ring 412, the split ring 412 and the gland 411 are adjacently sleeved on the valve rod 401, one end of the base 410 is sleeved on the second valve rod, and the other end is sleeved on the split ring 412 and the gland 411 and is clamped with the gland 411. The end of the base 410 connected with the first valve rod is a stepped groove, the split ring 412 and the gland 411 are sleeved on the first valve rod to form a stepped shaft shape and are matched with the stepped groove of the base 410, the edge of the base 410 is provided with a flange extending towards the central axis direction of the base, the gland 411 is provided with a recess along the circumferential direction, and the flange is matched with the recess, so that the base 410 is clamped with the gland 411. The connecting assembly can eliminate the coaxiality error of the valve rod 401 and the mounting hole of the valve rod 401 on the main valve body 100, and can reduce the requirement on the machining precision of the main valve body 100.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A low resistance backflow preventer, comprising:

the main valve body (100), the said main valve body (100) has drain openings (120), the said main valve body (100) is connected with the valve cover (110) removably, and form the control chamber with the said valve cover (110);

a water inlet check valve (200), wherein the water inlet check valve (200) is arranged inside the main valve body (100) and forms a water inlet cavity (210) with the main valve body (100);

a water outlet check valve (300), the water outlet check valve (300) is arranged inside the main valve body (100) and forms a water outlet cavity (310) with the main valve body (100), and an intermediate cavity (220) is formed between the water inlet check valve (200) and the water outlet check valve (300);

the drain valve (400), the drain valve (400) is arranged in the main valve body (100), the drain valve (400) comprises a valve rod (401), the valve rod (401) penetrates through the middle cavity (220), one end of the valve rod extends into the control chamber, and the other end of the valve rod extends to the drain opening (120); one end extending into the control chamber is sleeved with a diaphragm (402), the diaphragm (402) divides the control chamber into a water inlet control chamber (414) and a water outlet control chamber (416), the water inlet control chamber (414) is communicated with the water inlet cavity (210) through a water inlet channel (415), and the water outlet control chamber (416) is communicated with the water outlet cavity (310) through a water outlet channel (417); one end extending to the water discharge opening (120) is connected with a spring (403) and sleeved with a valve plate (404);

when the pressure of the water inlet cavity (210) is higher than the pressure of the water outlet cavity (310), the pressure of the water inlet control chamber (414) is higher than the sum of the elastic force of the spring (403) and the pressure of the water outlet control chamber (416), the valve plate (404) seals the water drainage opening (120), and the water drainage valve (400) is in a closed state;

when the pressure of the water inlet cavity (210) is smaller than or equal to the pressure of the water outlet cavity (310), the pressure of the water inlet control chamber (414) is smaller than the sum of the elastic force of the spring (403) and the pressure of the water outlet control chamber (416), the valve plate (404) is far away from the water drainage opening (120), and the water drainage valve (400) is in an open state.

2. The low resistance backflow preventer of claim 1, wherein the diaphragm (402) is sandwiched between the main valve body (100) and the bonnet (110), the bonnet (110) and the diaphragm (402) forming the inlet control chamber (414).

3. Low resistance backflow preventer according to claim 1 or 2, characterized in that the valve cover (110) is provided with an emergency screw (405), which emergency screw (405) can abut against the valve stem (401) sealing the drain opening (120).

4. A low resistance backflow preventer according to claim 3, wherein a movable block (406) is arranged between the emergency screw (405) and the valve rod (401), the outer side wall of the movable block (406) is attached to the inner side wall of the valve cover (110), and tightening the emergency screw (405) enables the movable block (406) to abut against the valve rod (401).

5. Low resistance backflow preventer according to claim 1 or 2, characterized in that a valve seat (407) is provided at the drain opening (120) in fixed connection with the main valve body (100), the valve seat (407) having a first port and a second port, the second port communicating with the drain opening (120), the valve plate (404) being capable of sealing the first port against the outflow of medium from the second port.

6. Low resistance backflow preventer according to claim 5, characterized in that a guide sleeve (408) is arranged between the valve plate (404) and the spring (403), the outer wall of the guide sleeve (408) abutting the inner wall of the valve seat (407).

7. A low resistance backflow preventer according to claim 5, characterized in that the end of the spring (403) remote from the valve stem (401) is provided with a spring adjusting ring (409), the outer wall of the spring adjusting ring (409) fitting against the inner wall of the valve seat (407).

8. Low resistance backflow preventer according to claim 1 or 2, wherein the valve stem (401) comprises a first valve stem and a second valve stem, the first valve stem and the second valve stem being fixedly connected by a connecting assembly.

9. A low resistance backflow preventer according to claim 8, wherein the coupling assembly comprises a base (410), a gland (411) and a split ring (412), the split ring (412) and the adjacent cover of the gland (411) are provided on the valve rod (401), a sleeve of the base (410) is provided on the second valve rod, and the other sleeve is provided on the split ring (412) and the gland (411) and is clamped with the gland (411).

10. A low resistance backflow preventer according to claim 1 or 2, wherein a filter screen (413) is provided in the intermediate chamber (220), the filter screen (413) is sleeved outside the valve plate (404) and is fixedly connected with the main valve body (100) for preventing impurities from flowing through the sealing surface of the valve plate (404).

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