CN215908471U

CN215908471U - Backflow preventer

Info

Publication number: CN215908471U
Application number: CN202122277851.9U
Authority: CN
Inventors: 何鹏; 何平
Original assignee: Fujian Boti Valve Manufacturing Co ltd
Current assignee: Fujian Boti Valve Manufacturing Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-02-25
Anticipated expiration: 2031-09-18

Abstract

The utility model provides a backflow preventer which can not be directly impacted by fluid when the fluid flows backwards, greatly reduces the situation that the sealing performance of the backflow preventer is damaged due to the direct impact of the backflow of the fluid, greatly prolongs the service life of the backflow preventer, and is beneficial to the use of the backflow preventer.

Description

Backflow preventer

Technical Field

The utility model relates to the technical field of backflow preventers, in particular to a backflow preventer.

Background

The backflow preventer is one device comprising non-return parts and capable of preventing water from flowing backwards in water supply pipeline.

The backflow preventer is a hydraulic control combination device which strictly limits the water in the pipeline to flow in one direction under the condition that the backflow pollution of tap water supply equipment, particularly domestic drinking water pipelines is serious and no device for effectively preventing backflow pollution is available.

The backflow pollution is defined as that as long as backflow occurs, the backflow pollution is called as backflow pollution no matter whether backflow water is polluted or not.

Although the conventional backflow preventer can play a role in preventing fluid backflow, the fluid often directly impacts the backflow preventing device when the fluid backflow is prevented, the sealing performance of the backflow preventing device is easily damaged, the service life of the backflow preventing device is rapidly shortened, and even the backflow preventing device is directly damaged, so that the backflow preventing device is not favorable for use.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a backflow preventer which can prevent fluid from directly impacting the backflow preventer when the fluid flows backwards, greatly reduce the damage of the sealing performance of the backflow preventer caused by the direct impact of the backflow of the fluid, greatly prolong the service life of the backflow preventer and facilitate the use of the backflow preventer, and overcomes the defects of the prior art.

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

the utility model provides a backflow preventer, includes the valve body, set gradually in inlet and liquid outlet in the valve body, set up in the valve body inner wall is close to be used for of inlet prevent that fluid from following the liquid outlet refluence advances the refluence preventing device of inlet, still including set up in the valve body inner wall is close to the liquid outlet is used for preventing to follow the liquid direct impact of liquid outlet refluence the refluence preventing device causes the impaired loss prevention device of refluence preventing device sealing performance.

The further improvement is that: loss prevention device is including setting up in the valve body inner wall is close to the connection crown plate of liquid outlet, set up in connecting the crown plate inner wall and be used for preventing to follow the liquid direct impact of liquid outlet refluence the refluence preventing device causes the impaired loss prevention board of refluence preventing device sealing performance, set up in be located on the connection crown plate at least one between valve body and the loss prevention board is used for the opening of fluid circulation.

The further improvement is that: the damage prevention plate is a conical damage prevention plate which is close to the liquid inlet end, is small and is close to the liquid outlet end, and is used for collecting the fluid coming out of the circulation hole and accelerating the fluid to flow out of the liquid outlet.

The further improvement is that: the end face, away from the liquid outlet, of the damage prevention plate is provided with a stable communication device which is used for buffering and decelerating the fluid coming out of the backflow prevention device so that the fluid stably passes through the circulation hole.

The further improvement is that: the steady device of leading to including set up in the loss prevention board is kept away from the elasticity cover of that terminal surface of liquid outlet, set up in elasticity cover with the elastic filler between the loss prevention board.

The further improvement is that: the elastic filler is polyurethane foam filler.

The further improvement is that: the backflow preventing device comprises a valve body inner wall, a valve seat, a mounting plate, a sliding rod, a valve seat matched with the valve seat, a reset spring and a plurality of through holes, wherein the valve body inner wall is close to the valve seat of the inlet, the mounting plate and the valve seat inner wall are arranged on the mounting plate in a sliding mode, the slide rod is arranged on the mounting plate and is far away from the inlet end, the valve seat matched with the valve clack is arranged on the mounting plate, the mounting plate and the valve clack are located between the slide rod and the reset spring outside the slide rod, the reset spring and the through holes are arranged on the mounting plate, fluid can pass through the through holes, and the slide rod can be axially slid along the valve body.

The further improvement is that: the end of the sliding rod, which is close to the liquid inlet, is provided with a limiting block which abuts against the mounting plate to limit the sliding of the sliding rod when the sliding rod slides to the liquid outlet for a preset distance.

The further improvement is that: the valve body is provided with flanges at the liquid inlet and the liquid outlet.

The further improvement is that: the through holes are arranged on the mounting plate in a circle shape by taking the circle center of the mounting plate as the center.

After the technical scheme is adopted, the utility model has the beneficial effects that: when the pressure of the inlet is greater than that of the liquid outlet, the fluid at the inlet opens the backflow prevention device to a preset position, the fluid sequentially passes through the backflow prevention device, the valve body and the loss prevention device and is discharged from the liquid outlet, when the pressure of the inlet is less than that of the liquid outlet, the fluid is not enough to open the backflow prevention device, the backflow prevention device is reset to the original position, the backflow prevention device can prevent the fluid from flowing back into the inlet from the liquid outlet, the loss prevention device close to the liquid outlet can prevent the liquid flowing back from the liquid outlet from directly impacting the backflow prevention device to cause the damage to the sealing performance of the backflow prevention device, the fluid cannot directly impact the backflow prevention device when flowing back, the situation that the sealing performance of the backflow prevention device is damaged due to the direct impact of the fluid flowing back is greatly reduced, and the service life of the backflow prevention device is greatly prolonged, is beneficial to the use of the backflow preventer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of another state of use of the present invention;

FIG. 3 is a schematic view of the structure of the valve body, the connecting ring plate, the damage preventing plate and the flow hole in the present invention;

FIG. 4 is a schematic view showing the structure of the mounting plate and the through hole in the present invention.

Detailed Description

The utility model will now be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 4, the technical solution adopted by the present embodiment is:

the utility model provides a backflow preventer, includes valve body 1, set gradually in inlet 2 and liquid outlet 3 in the valve body 1, set up in 1 inner wall of valve body is close to inlet 2 be used for preventing that fluid from following liquid outlet 3 flows backwards and advances the backflow prevention device of inlet 2, still including set up in 1 inner wall of valve body is close to liquid outlet 3 is used for preventing to follow the liquid direct impact of 3 refluences of liquid outlet the backflow prevention device causes the impaired loss prevention device of backflow prevention device sealing performance.

Loss prevention device is including setting up in 1 inner wall of valve body is close to the connection crown plate 4 of liquid outlet 3, set up and be used for preventing to follow in 4 inner walls of connection crown plate the liquid direct impact of 3 refluxes of liquid outlet prevent device from causing the impaired loss prevention board 5 of refluxes prevent device sealing performance, set up in connect the crown plate 4 and go up and lie in at least one opening 6 that is used for the fluid circulation between valve body 1 and the loss prevention board 5.

The damage prevention plate 5 is a conical damage prevention plate which is close to the end of the liquid inlet 2, is small and is close to the end of the liquid outlet 3, and is used for collecting the fluid coming out of the circulation hole 6 and accelerating the fluid to flow out of the liquid outlet 3.

The end face, far away from the liquid outlet 3, of the damage prevention plate 5 is provided with a stable communicating device which is used for buffering and decelerating the fluid coming out of the backflow prevention device so as to enable the fluid to stably pass through the circulating hole 6.

Steady expert's device including set up in loss prevention board 5 is kept away from the elasticity cover 7 of 3 terminal surfaces of liquid outlet, set up in elasticity cover 7 with elastic filler 8 between loss prevention board 5.

The elastic filler 8 is a polyurethane foam filler.

The backflow preventing device comprises a valve body 1 inner wall close to a valve seat 9 of a liquid inlet 2, a mounting plate 10 and a sliding device, wherein the mounting plate 10 and the sliding device are arranged on the inner wall of the valve seat 9, a sliding rod 11 is arranged on the mounting plate 10, the sliding rod 11 is far away from the liquid inlet 2 end is used for being matched with a valve clack 12 of the valve seat 9, a valve clack 12 is arranged between the mounting plate 10 and the valve clack 12 is located between a reset spring 13 outside the sliding rod 11 and a plurality of through holes 14 for fluid to pass through are formed in the mounting plate 10, and the sliding rod 11 can be along the axial sliding of the valve body 1.

The end of the sliding rod 11 close to the liquid inlet 2 is provided with a limiting block 15 which abuts against the mounting plate 10 to limit the sliding of the sliding rod 11 when the sliding rod 11 slides to the liquid outlet 3 to a predetermined distance.

And flanges 16 are arranged at the liquid inlet 2 and the liquid outlet 3 on the valve body 1.

The plurality of through holes 14 are arranged on the mounting plate 10 in a circular arrangement with the center of the mounting plate 10 as the center.

The working principle of the utility model is as follows: the valve body 1 is arranged in the pipeline through the flanges 16 at the liquid inlet 2 and the liquid outlet 3, when the pressure of the liquid inlet 2 is higher than the pressure of the liquid outlet 3, the fluid at the liquid inlet 2 passes through the through holes 14 on the mounting plate 10 and flows towards the valve clack 12, the fluid pushes the valve clack 12 to move towards the liquid outlet 3, because the sliding rod 11 is matched with the mounting plate 10, the valve clack 12 plays a guiding role when axially sliding along the valve body 1, the valve clack 12 overcomes the pulling force of the reset spring 13, the valve clack 12 is separated from the valve seat 9 to a preset position, the fluid passes through the valve seat, the valve clack 12 and the valve body 1 and flows towards the flow through hole 6 and is discharged from the liquid outlet 3, when the pressure of the liquid inlet 2 is lower than the pressure of the liquid outlet 3, the fluid is not enough to enable the valve clack 12 to overcome the pulling force of the reset spring 13, the valve clack 12 is reset to the original position to be sealed with the valve seat 9, and the backflow can prevent the fluid from entering the liquid inlet 2 from the liquid outlet 3, be close to during the fluid refluence of 3 departments of liquid outlet 5 can prevent to follow the liquid direct impact of 3 refluences of liquid outlet valve clack 12 causes valve clack 12 and the 9 sealing performance of disk seat to damage, and fluid can not directly strike valve clack 12 during the fluid refluence, and greatly reduced valve clack 12 receives the impaired condition of sealing performance that the direct impact of fluid refluence caused, prolongs refluence preventing means's life greatly, is favorable to the use of refluence preventing device.

The utility model is to protect the structure of a product, the types of all elements are not the content protected by the utility model and are also the known technology, and the elements which can realize the functions of the utility model can be selected and applied in the market. Therefore, the parameters such as the type of the components are not described in detail in the present invention. The utility model is characterized by combining the components together scientifically.

While there have been shown and described what are at present considered to be the fundamental principles of the utility model and its essential features and advantages, it will be understood by those skilled in the art that the utility model is not limited by the embodiments described above, which are included to illustrate the principles of the utility model, but that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents. The utility model is not described in detail, but is well known to those skilled in the art.

Claims

1. The utility model provides a backflow preventer, includes the valve body, set gradually in inlet and liquid outlet in the valve body, set up in the valve body inner wall is close to be used for of inlet prevents that fluid from following the liquid outlet refluences and advances the backflow prevention device of inlet, its characterized in that: still including set up in the valve body inner wall is close to the liquid outlet is used for preventing to follow the liquid direct impact of liquid outlet refluence the refluence preventing device causes the impaired loss prevention device of refluence preventing device sealing performance.

2. A backflow preventer as claimed in claim 1, wherein: loss prevention device is including setting up in the valve body inner wall is close to the connection crown plate of liquid outlet, set up in connecting the crown plate inner wall and be used for preventing to follow the liquid direct impact of liquid outlet refluence the refluence preventing device causes the impaired loss prevention board of refluence preventing device sealing performance, set up in be located on the connection crown plate at least one between valve body and the loss prevention board is used for the opening of fluid circulation.

3. A backflow preventer as claimed in claim 2, wherein: the damage prevention plate is a conical damage prevention plate which is close to the liquid inlet end, is small and is close to the liquid outlet end, and is used for collecting the fluid coming out of the circulation hole and accelerating the fluid to flow out of the liquid outlet.

4. A backflow preventer as claimed in claim 2, wherein: the end face, away from the liquid outlet, of the damage prevention plate is provided with a stable communication device which is used for buffering and decelerating the fluid coming out of the backflow prevention device so that the fluid stably passes through the circulation hole.

5. A backflow preventer as claimed in claim 4, wherein: the steady device of leading to including set up in the loss prevention board is kept away from the elasticity cover of that terminal surface of liquid outlet, set up in elasticity cover with the elastic filler between the loss prevention board.

6. A backflow preventer as claimed in claim 5, wherein: the elastic filler is polyurethane foam filler.

7. A backflow preventer as claimed in claim 1, wherein: the backflow preventing device comprises a valve body inner wall, a valve seat, a mounting plate, a sliding rod, a valve seat matched with the valve seat, a reset spring and a plurality of through holes, wherein the valve body inner wall is close to the valve seat of the inlet, the mounting plate and the valve seat inner wall are arranged on the mounting plate in a sliding mode, the slide rod is arranged on the mounting plate and is far away from the inlet end, the valve seat matched with the valve clack is arranged on the mounting plate, the mounting plate and the valve clack are located between the slide rod and the reset spring outside the slide rod, the reset spring and the through holes are arranged on the mounting plate, fluid can pass through the through holes, and the slide rod can be axially slid along the valve body.

8. A backflow preventer as claimed in claim 7, wherein: the end of the sliding rod, which is close to the liquid inlet, is provided with a limiting block which abuts against the mounting plate to limit the sliding of the sliding rod when the sliding rod slides to the liquid outlet for a preset distance.

9. A backflow preventer as claimed in claim 1, wherein: the valve body is provided with flanges at the liquid inlet and the liquid outlet.

10. A backflow preventer as claimed in claim 7, wherein: the through holes are arranged on the mounting plate in a circle shape by taking the circle center of the mounting plate as the center.