CN217130432U - Backflow preventer - Google Patents

Abstract

The utility model relates to a backflow preventer, which comprises a water inlet valve, a water outlet valve and a water outlet valve which are communicated in sequence; the water discharge valve comprises a water discharge shell and a water discharge control mechanism, a first cavity and a second cavity are arranged in the water discharge shell, the water inlet valve and the water outlet valve are both communicated with the first cavity, and the water inlet valve is provided with a water passing channel communicated with the second cavity; the water drainage control mechanism comprises a valve rod, a water drainage connector and an elastic membrane fixedly arranged in the second cavity, one end of the valve rod is connected with the side wall of the elastic membrane and driven by the elastic membrane, and the other end of the valve rod penetrates through the first cavity and can be inserted into the water drainage connector to be tightly connected with the water drainage connector; the water release connector is provided with a water release hole, an adjusting mechanism is arranged in the water release hole, the water release connector is inserted in the side wall of the water release valve and communicated with the first cavity and the external environment through the water release hole, and the valve rod is connected with the adjusting mechanism. The utility model discloses can be according to pipe network water pressure regulation sluicing pressure, its commonality is stronger.

Description

Backflow preventer

Technical Field

The utility model belongs to the technical field of the valve, more specifically relates to a backflow preventer.

Background

The backflow preventer is a valve device formed by combining two separated check valves and a safety drain valve, the switch of the safety drain valve is controlled by water pressure, the backflow preventer is generally used on a user-entering pipe connected to a water pipe network, and the two check valves of the backflow preventer can be closed in time when the upstream of a pipeline is in pressure loss, so that the situation that water at the downstream flows back to the upstream pipe network to cause pollution is prevented, and the water supply safety is further ensured.

For the remote or terminal area in the water delivery pipe network, because the pipeline is long, the water pressure loss is serious, and can be lower than 0.1MPa in serious conditions, the water pressure can not completely close the safety water escape valve, the situation that the safety water escape valve and the check valve start water delivery at the same time can be caused, and certain resource waste can be caused; meanwhile, the check valve and the safety drain valve are both opened, so that the downstream pollution is possible to flow back, and the pollution prevention effect is not good; in addition, the safe water drain valve is opened to be communicated with the outside, and the water supply pressure of a pipe network can be seriously influenced.

In addition, the spring in the backflow preventer in the prior art cannot be adjusted, namely the drain pressure cannot be adjusted, so that the backflow preventer in the same pipe network at different water delivery length positions cannot be correspondingly adjusted according to the actual use environment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome at least one defect among the above-mentioned prior art, provide a backflow preventer, it can carry out the adaptability according to the different pressures of pipe network and adjust to guarantee good anti-backflow effect.

In order to solve the technical problem, the utility model discloses a technical scheme is:

providing a backflow preventer, which comprises a water inlet valve, a water drain valve and a water outlet valve which are communicated in sequence; the water discharge valve comprises a water discharge shell and a water discharge control mechanism, a first cavity and a second cavity are arranged in the water discharge shell, the water inlet valve and the water outlet valve are both communicated with the first cavity, and the water inlet valve is provided with a water passing channel communicated with the second cavity; the water drainage control mechanism comprises a valve rod, a water drainage connector and an elastic membrane fixedly arranged in the second cavity, one end of the valve rod is connected with the side wall of the elastic membrane and driven by the elastic membrane, and the other end of the valve rod penetrates through the first cavity and can be inserted into the water drainage connector to be tightly connected with the water drainage connector; the water release connector is provided with a water release hole, an adjusting mechanism which can move along the water release direction and is used for adjusting the water release pressure is arranged in the water release hole, the water release connector is inserted in the side wall of the water release valve and is communicated with the first cavity and the external environment through the water release hole, and the valve rod is connected with the adjusting mechanism.

Through setting up adjustment mechanism in this scheme in order to adjust sluicing pressure, can adjust the sluicing pressure of backflow preventer according to the on-the-spot water pressure condition when using like this to avoid causing the backflow preventer can not normally work because of the not enough problem of water pressure, improved the water pressure adaptability of backflow preventer, improved pipeline installation's convenience greatly.

As a further improved structure, the adjusting mechanism includes an adjusting rod inserted into the drain hole and capable of moving along the axial line of the drain hole, and an elastic member located between the adjusting rod and the valve rod, wherein one end of the elastic member is fixedly connected with the adjusting rod, and the other end of the elastic member is abutted against the valve rod.

As a further improved structure, the adjusting rod is in threaded connection with the inner side wall of the water drainage hole, and a locking nut is further arranged at one end, far away from the valve rod, of the adjusting rod.

As a further improved structure form, the valve rod is provided with a water drainage valve clack close to the water drainage joint, and the water drainage valve clack is abutted against the elastic member and covers the water drainage hole.

The side wall of the sealing part is an inclined wall which inclines from the base to the drain hole and is close to the axis of the drain hole, and a socket tightly connected with the inclined wall is arranged at the end part of the drain hole close to the sealing part.

As a further improved structural form, the elastic member is a first compression spring, the first compression spring and the water drainage hole are coaxially arranged, and one end of the sealing part close to the first compression spring is provided with a limiting block inserted into the first compression spring.

As a further improved structure form, the base is provided with an insertion hole, the valve rod is inserted into the insertion hole, and a ball is embedded between the side wall of the valve rod and the side wall of the insertion hole.

As a further improved structure form, the water outlet valve further comprises a detection joint communicated with the water inlet valve, the first cavity and the water outlet valve.

As a further improved structural form, the detection joint comprises three ball valves which are respectively communicated with the water inlet valve, the first cavity and the water outlet valve.

As a further improved structure form, the water drainage shell is also provided with an exhaust valve communicated with the water passing channel.

Compared with the prior art, the beneficial effects are:

the utility model discloses the accessible is adjusted the distance between pole and the sluicing valve clack, can adjust the elasticity of first compression spring to the valve clack, and then the adjusting valve pole overcomes the required pressure of first compression spring, can adjust the regulating part according to on-the-spot water pressure when the installation like this, guarantee to open at the water intaking valve before rivers get into the second cavity through water channel and promote the valve stem and close the sluicing valve rapidly, and then avoid the condition that the backflow preventer can not normally work and appear leaking in the use.

Drawings

FIG. 1 is a schematic view showing the structure of a backflow preventer according to embodiment 1 of the present invention;

FIG. 2 is a schematic view showing an initial state of the backflow preventer according to embodiment 1 of the present invention;

FIG. 3 is a schematic view of a closed drain valve of the backflow preventer according to embodiment 1 of the present invention;

FIG. 4 is a schematic view showing the open state of the water inlet valve of the backflow preventer according to embodiment 1 of the present invention;

FIG. 5 is a schematic view showing a drain state of a drain valve of the backflow preventer according to embodiment 1 of the present invention;

FIG. 6 is a schematic view showing a normal working state in which the inlet valve and the outlet valve of the backflow preventer of embodiment 1 of the present invention are fully open;

FIG. 7 is a schematic view showing the installation of the detection mechanism of the backflow preventer according to embodiment 2 of the present invention;

FIG. 8 is a schematic view showing the connection between the exhaust valve and the water passage of the backflow preventer according to embodiment 3 of the present invention. Wherein the arrow direction indicates the water flow direction or the valve stem force direction.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Example 1:

as shown in fig. 1 to 6, a first embodiment of a backflow preventer comprises a water inlet valve 1, a water discharge valve 2 and a water outlet valve 3 which are communicated in sequence; the water discharge valve 2 comprises a water discharge shell 21 and a water discharge control mechanism, a first cavity 211 and a second cavity 212 are arranged in the water discharge shell 21, the water inlet valve 1 and the water outlet valve 3 are both communicated with the first cavity 211, and the water inlet valve 1 is provided with a water passing channel 11 communicated with the second cavity 212; the water drainage control mechanism comprises a valve rod 22, a water drainage connector 23 and an elastic membrane 24 fixedly arranged in the second cavity 212, one end of the valve rod 22 is connected with the side wall of the elastic membrane 24 and driven by the elastic membrane 24, the other end of the valve rod passes through the first cavity 211 and can be inserted into the water drainage connector 23 to be tightly connected with the water drainage connector 23, and specifically, one end of the valve rod 22 is abutted against the bottom of the elastic membrane 24; the drain joint 23 is provided with a drain hole 231, an adjusting mechanism 232 which can move along the drain direction and is used for adjusting the drain pressure is arranged in the drain hole 231, the drain joint 23 is inserted into the side wall of the drain valve 2 and is communicated with the first cavity 211 and the external environment through the drain hole 231, and the valve rod 22 is connected with the adjusting mechanism 232.

The water release valve 2 further comprises a valve cover 25, the valve cover 25 is arranged at the top of the water release shell 21 and seals the second cavity 212, and the elastic membrane 24 is arranged between the cover and the top of the water release shell 21, so that the elastic membrane 24 divides the first cavity 211 into an upper half part and a lower half part, the upper half part is communicated with the water passing channel 11 and cannot be communicated with the first cavity 211, the elastic membrane 24 deforms downwards due to water entering the upper half part, and the lower half part can accommodate the elastic membrane 24; the drain case 21 is provided with a guide sleeve 26 penetrating through a side wall of the drain case 21, and the valve rod 22 is inserted into the guide sleeve 26 and slidably fitted.

It should be noted that the principle and structure of the one-way communication between the inlet valve 1 and the outlet valve 3 are well known to those skilled in the art, and are not limited herein; for the sake of easy understanding, the structure of the inlet valve 1 and the outlet valve 3 is explained in detail in this embodiment, the water inlet valve 1 comprises a water inlet valve body 12, a water inlet valve clack 13 and a second compression spring 14, wherein the water inlet valve body 12 is provided with a third cavity 15, a first guide seat 16 is arranged in the third cavity 15, a first guide hole 161 is formed in the first guide seat 16, the third cavity 15 is communicated with the first cavity 211, one end, far away from the first cavity 211, of the third cavity 15 is provided with a first compression spring cover 17, the water inlet valve clack 13 comprises a first insertion rod 131 and a first baffle 132 arranged at one end of the first insertion rod 131, the other end of the first insertion rod 131 is inserted into the first guide hole 161 along the water inlet direction and is in sliding fit with the first guide seat 16, the second compression spring 14 is sleeved in the first insertion rod 131, and two ends of the second compression spring 14 are respectively abutted against the first guide seat 16 and the first compression spring cover 17; the first baffle 132 is located between the third cavity 15 and the first cavity 211 and covers the end surface of the third cavity 15 close to the first cavity 211, and the water passing channel 11 is communicated with the third cavity 15.

In addition, the outlet valve 3 includes an outlet valve body 31, an outlet valve flap 32 and a third compression spring 33, the outlet valve body 31 is provided with a fourth cavity 34 communicated with the first cavity 211, the fourth cavity 34 is provided with a second guide seat 35, the second guide seat 35 is disposed between the first cavity 211 and the fourth cavity 34, the second guide seat 35 is provided with a guide rod 351 extending in a direction away from the first cavity 211, the outlet valve flap 32 includes a second insertion rod 321 and a second baffle 322 disposed at one end of the second insertion rod 321, one end of the second insertion rod 321 close to the second guide seat 35 is provided with a second guide hole 323, the other end of the second insertion rod is inserted into the outlet valve body 31 and is in sliding fit with the second insertion rod, the guide rod 351 is inserted into the second guide hole 323, the second baffle 322 is disposed at one side of the second guide seat 35 away from the first cavity 211 and is tightly connected with the first cavity 211, the third compression spring 33 is sleeved on the second insertion rod 321, and two ends of the third compression spring are respectively connected with the second baffle 322, The side of the water outlet valve body 31 where the second insertion rod 321 is inserted abuts against.

The magnitude relationship among the elastic forces of the first compression spring 2322, the second compression spring 14 and the third compression spring 33 needs to satisfy: the first compression spring 2322 < the second compression spring 14 < the third compression spring 33, and preferably, the second compression spring 14 is twice as large as the elastic force of the first compression spring 2322, so as to ensure that the water inlet valve flap 13 is opened after the water outlet valve 2 is completely closed, and water flows into the first cavity 211 of the water outlet valve 2 through the water inlet valve 1.

As shown in fig. 2 to 6, in an initial state (see fig. 2), the second compression spring 14 and the third compression spring 33 are in a pre-tightening state, the first baffle 132 separates the first cavity 211 from the third cavity 15, the water flow of the third cavity 15 enters the second cavity 212 through the water passage 11, the pressure in the second cavity 212 increases, so that the elastic membrane 24 deforms to apply a downward pressure on the valve rod 22, and the valve rod 22 is driven to move downward to be tightly connected with the drain joint 23, so as to seal the drain joint 23, and the water flow can only flow out from the water outlet valve 3; when the water pressure at the end of the water inlet valve 1 is reduced, the second compression spring 14 drives the water inlet valve clack 13 to reset to isolate the water inlet valve 1 from the water outlet valve 2, the third compression spring 33 drives the water outlet valve clack 32 to reset to isolate the water outlet valve 2 from the water outlet valve 3, so that the water is prevented from flowing back to the water inlet valve 1 from the water outlet valve 2, the elastic membrane 24 restores to drive the valve rod 22 to move upwards, the valve rod 22 is separated from the water outlet connector 23, and the water in the first cavity 211 flows out through the water outlet connector 23, so that the function of preventing backflow to cause secondary pollution is realized.

The adjusting mechanism 232 in this embodiment includes an adjusting rod 2321 inserted into the drainage hole 231 and movable along the axial line of the drainage hole 231, and a first compression spring 2322 located between the adjusting rod 2321 and the valve rod 22, wherein one end of the first compression spring 2322 is fixedly connected to the adjusting rod 2321, and the other end of the first compression spring 2322 abuts against the valve rod 22. Thus, the distance between the adjusting rod 2321 and the valve rod 22 is adjusted through the movement of the adjusting rod 2321, so that the pre-elasticity of the first compression spring 2322 is adjusted, the pre-elasticity and the elasticity of the elastic membrane 24 are added to obtain corresponding water drainage pressure, namely the water drainage pressure can be adjusted by adjusting the pre-elasticity of the first compression spring 2322, and therefore the backflow preventer can be conveniently adjusted according to the water pressure of a field pipe network, so that the backflow preventer can adapt to the current water pressure, and the adaptability and the universality of the backflow preventer are greatly enhanced.

Specifically, the adjusting rod 2321 in this embodiment is in threaded connection with the inner side wall of the drainage hole 231, and a locking nut 2323 is further disposed at one end of the adjusting rod 2321 away from the valve rod 22. The distance between the adjusting rod 2321 and the valve rod 22 can be adjusted by rotating the adjusting rod, and when the distance is proper, the adjusting rod 2321 is locked by tightening the locking nut 2323, so that the adjustment of the water discharge pressure can be realized.

The valve rod 22 in this embodiment is provided with a drain valve flap 221 near the drain joint 23, and the drain valve flap 221 abuts against the elastic member and covers the drain hole 231. Specifically, the elastic member is a first compression spring 2322, the drain valve flap 221 in this embodiment includes a base portion 2211 and a sealing portion 2212 which are fixedly connected, the base portion 2211 is connected to the valve rod 22, a side wall of the sealing portion 2212 is an inclined wall which is inclined from the base portion 2211 to the drain hole 231 and in a direction close to the axial line of the drain hole 231, and an end portion of the drain hole 231 close to the sealing portion 2212 is provided with a socket 233 which is tightly connected to the inclined wall. Therefore, the contact area of the valve rod 22 and the drain joint 23 can be increased by utilizing the drain valve clack 221, so that the sealing effect on the drain joint 23 is improved, the drain joint 23 is ensured to be well sealed under the action of the valve rod 22, and the water leakage of the drain joint 23 in the normal use process is avoided.

In this embodiment, the first compression spring 2322 is disposed coaxially with the water drainage hole 231, and a stop block 2213 inserted into the first compression spring 2322 is disposed at one end of the sealing portion 2212 close to the first compression spring 2322. This ensures that the valve stem 22 is aligned with the first compression spring 2322, compressing the first compression spring 2322 and sealing the bleed water connection 23.

The base 2211 in the embodiment is provided with a plug 2214, the valve rod 22 is inserted into the plug 2214, and a ball 2215 is embedded between the side wall of the valve rod 22 and the side wall of the plug 2214. Therefore, the coaxiality between the valve rod 22 and the water drainage valve clack 221 can be improved, the valve rod 22 is prevented from inclining under the impact of water flow, the valve rod 22 can be ensured to apply force at the center of the valve clack to enable the valve clack to stably move downwards, and good contact sealing of the water drainage connector 23 is realized.

Of course, in order to seal the backflow preventer, the respective joints of the inlet valve 1, the drain valve 2 and the outlet valve 3 should be sealed by corresponding sealing rings, which are well known to those skilled in the art and will not be described in detail herein.

When the backflow preventer is used, the adjusting rod 2321 can be rotated according to the water pressure of a field pipe network to adjust the distance between the adjusting rod and the water discharge valve clack 221, so that the pre-elasticity of the first compression spring 2322 is adjusted, the water discharge pressure is adjusted, and the problem that the water discharge valve 2 of the backflow preventer cannot be normally closed due to insufficient pipe network pressure in a certain area can be solved.

Example 2:

referring to FIG. 7, a second embodiment of the backflow preventer is shown, and the present embodiment is different from embodiment 1 only in that the present embodiment further includes a detection connector 4 communicating with the inlet valve 1, the first chamber 211 and the outlet valve 3.

Specifically, the detection joint 4 in this embodiment includes three ball valves 41 respectively communicated with the water inlet valve 1, the first cavity 211, and the water outlet valve 3, and the ball valves 41 are further connected with corresponding connecting pipes, so that an external detection instrument can be communicated with the backflow preventer through the connecting pipes and the ball valves 41 to detect the pressure of the backflow preventer, and the backflow preventer can be conveniently detected before delivery and in a use process.

Example 3:

as shown in fig. 8, a third embodiment of a backflow preventer is provided, and the present embodiment is different from embodiment 1 or embodiment 2 only in that a vent valve 5 communicating with a water passing channel 11 is further provided on a drain casing 21 in the present embodiment; specifically, the exhaust valve 5 is provided on the valve cover 25. This prevents the water pressure in the second chamber 212 from reaching a normal level to push the valve stem 22 due to the air remaining in the second chamber 212.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. 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 backflow preventer comprises a water inlet valve (1), a water drain valve (2) and a water outlet valve (3) which are communicated in sequence; the water release valve (2) comprises a water release shell (21) and a water release control mechanism, a first cavity (211) and a second cavity (212) are arranged in the water release shell (21), the water inlet valve (1) and the water outlet valve (3) are both communicated with the first cavity (211), and the water inlet valve (1) is provided with a water passing channel (11) communicated with the second cavity (212); the water drainage control mechanism comprises a valve rod (22), a water drainage connector (23) and an elastic membrane (24) fixedly arranged in the second cavity (212), one end of the valve rod (22) is connected with the side wall of the elastic membrane (24) and driven by the elastic membrane (24), and the other end of the valve rod penetrates through the first cavity (211) and can be inserted into the water drainage connector (23) to be tightly connected with the water drainage connector (23); the pressure-relief valve is characterized in that the drain connector (23) is provided with a drain hole (231), an adjusting mechanism (232) which can move along the drain direction and is used for adjusting the drain pressure is arranged in the drain hole (231), the drain connector (23) is inserted into the side wall of the drain valve (2) and is communicated with the first cavity (211) and the external environment through the drain hole (231), and the valve rod (22) is connected with the adjusting mechanism (232).

2. The backflow preventer according to claim 1, wherein the adjusting mechanism (232) comprises an adjusting rod (2321) inserted into the drain hole (231) and movable along an axial line of the drain hole (231), and an elastic member located between the adjusting rod (2321) and the valve rod (22), wherein one end of the elastic member is fixedly connected with the adjusting rod (2321), and the other end of the elastic member abuts against the valve rod (22).

3. A backflow preventer according to claim 2, wherein the adjusting rod (2321) is in threaded connection with the inner side wall of the drainage hole (231), and a locking nut (2323) is further arranged at one end of the adjusting rod (2321) far away from the valve rod (22).

4. A backflow preventer according to claim 2, wherein the valve rod (22) is provided with a bleed valve flap (221) adjacent to the bleed joint (23), the bleed valve flap (221) abutting against the resilient member and covering the bleed hole (231).

5. A backflow preventer according to claim 4, characterized in that the drain flap (221) comprises a base portion (2211) and a sealing portion (2212) which are fixedly connected, the base portion (2211) is connected with the valve rod (22), the side wall of the sealing portion (2212) is an inclined wall which is inclined from the base portion (2211) to the drain hole (231) and close to the axial lead of the drain hole (231), and the end of the drain hole (231) close to the sealing portion (2212) is provided with a socket (233) which is tightly connected with the inclined wall.

6. A backflow preventer according to claim 5, wherein the elastic member is a first compression spring (2322), the first compression spring (2322) is coaxially disposed with the water drain hole (231), and a stopper (2213) inserted into the first compression spring (2322) is disposed at an end of the sealing portion (2212) adjacent to the first compression spring (2322).

7. A backflow preventer according to claim 6, wherein the base portion (2211) is provided with a socket (2214), the valve stem (22) is inserted into the socket (2214), and balls (2215) are embedded between the side walls of the valve stem (22) and the side walls of the socket (2214).

8. Backflow preventer according to any of claims 1 to 7, further comprising a detection connector (4) communicating with the inlet valve (1), the first cavity (211) and the outlet valve (3).

9. Backflow preventer according to claim 8, wherein the detection connector (4) comprises three ball valves (41) communicating with the inlet valve (1), the first chamber (211) and the outlet valve (3), respectively.

10. A backflow preventer according to claim 8, wherein the drain housing (21) is further provided with an exhaust valve (5) communicating with the water passage (11).

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