CN215371115U

CN215371115U - Backflow prevention device

Info

Publication number: CN215371115U
Application number: CN202120553210.9U
Authority: CN
Inventors: 龚斌华; 何溪元; 冯远飞
Original assignee: Bestter Xiamen Technology Inc
Current assignee: Bestter Xiamen Technology Inc
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-12-31
Anticipated expiration: 2031-03-17

Abstract

The utility model discloses a backflow prevention device, comprising: the body comprises a cylindrical outer ring wall, the lower end of the outer ring wall is provided with a bottom plate for closing the bottom end, the bottom plate is provided with an inner ring wall which is coaxial with the outer ring wall, the diameter of the inner ring wall is smaller than that of the outer ring wall, and the height of the inner ring wall is also smaller than that of the outer ring wall; the water inlet pipe and the water outlet pipe are respectively communicated with the inner cavity and the outer cavity; and an upper cover covering the upper opening of the outer ring wall. The utility model can make the floating core move up and down under the action of fluid, thereby reducing parts.

Description

Backflow prevention device

Technical Field

The utility model relates to a backflow prevention device.

Background

In fluid delivery pipes, such as water paths of toilets, backflow prevention devices are required to prevent the interior of the pipe from generating vacuum when water is cut off, and sewage flows backwards to pollute the internal structure. CN201820785593 discloses a vacuum valve breaker structure for an intelligent toilet. Including vacuum valve body, inlet tube and outlet pipe, the vacuum valve body outside is equipped with the intercommunicating pore that is linked together with the inner chamber, and vacuum valve body upper end is uncovered, and vacuum valve body upper end is equipped with the vacuum valve gap, and vacuum valve gap upper end center has inside sunken annular concave station, annular concave station in have a plurality of inlet ports, be equipped with the guiding gutter on vacuum valve gap, guiding gutter one end and annular concave station are linked together, the other end extends to the vacuum valve gap outside, is equipped with the vacuum valve core at vacuum valve body internalization, is equipped with elasticity roof pressure structure in the vacuum valve body, and vacuum valve core upper end has annular seal platform. However, this structure requires a spring or the like, which is costly.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a backflow prevention device.

The technical scheme adopted by the utility model for solving the technical problem is as follows:

a backflow prevention device comprising:

the body comprises a cylindrical outer ring wall, the lower end of the outer ring wall is provided with a bottom plate for closing the bottom end, the bottom plate is provided with an inner ring wall which is coaxial with the outer ring wall, the diameter of the inner ring wall is smaller than that of the outer ring wall, and the height of the inner ring wall is also smaller than that of the outer ring wall; the water inlet pipe and the water outlet pipe are respectively communicated with an inner cavity formed by the inner annular wall;

the upper cover covers the upper end opening of the outer ring wall; the upper cover is arranged at the opening of the movable cavity of the body and is provided with an air vent;

the upper end of the inner ring wall is provided with a floating core which can move up and down along the outer ring wall; the floating core is provided with a first position and a second position, in the first position, the lower surface of the floating core is positioned on the inner ring wall, and the vent hole of the upper cover is opened; in the second position, the floating core is separated from the inner ring wall upwards, and the floating core and the upper cover are matched to block the vent hole.

In a preferred embodiment, the water inlet pipe penetrates through the outer ring wall and the inner ring wall from outside to inside respectively, and is communicated with an inner cavity formed by the inner ring wall.

In another preferred embodiment, the water inlet pipe is communicated with the inner cavity formed by the inner annular wall through the bottom of the bottom plate.

In a preferred embodiment, in the second position, the engagement of the floating core with the upper cover is the engagement between the upper surface of the floating core and the lower surface of the upper cover.

In a preferred embodiment, the upper surface of the floating core is also provided with a sealing sheet.

In a preferred embodiment, the upper cover comprises a cover body and a cylinder body arranged on the upper surface of the cover body, and the middle of the cover body is provided with a vent hole.

In a preferred embodiment, the floating core comprises a circular plate and a positioning column arranged on the upper surface of the circular plate, and the positioning column is inserted into the vent hole of the upper cover.

In a preferred embodiment, an inner cavity is formed in the positioning column, the inner cavity is opened downwards, and the opening is positioned on the lower surface of the circular plate.

In a preferred embodiment, the opening of the inner cavity is flared, and the large opening faces downwards.

In a preferred embodiment, the side surface of the positioning column is provided with 2-4 side wing plates extending in the vertical direction, and the side wing plates are arranged at intervals around the peripheral surface of the positioning column.

Compared with the background technology, the technical scheme has the following advantages:

1. the body of the utility model is provided with an outer ring wall and an inner ring wall, the inner ring wall is provided with a floating core, an inner cavity enclosed by a water inlet pipe and the inner ring wall is communicated, and an outer cavity between a water outlet pipe and the outer ring wall and the inner ring wall is communicated, so that when water enters, water flow needs to go upwards to cross the top end of the inner ring wall to enter the water outlet pipe, and therefore, the floating core can move upwards to block an air vent of the upper cover by means of upward power and/or buoyancy of the water flow; when water is not supplied, the floating core falls down naturally due to the action of gravity, and the vent is opened, so that the backflow is prevented. Thus, the present invention does not require the use of a spring.

2. The utility model has the sealing sheet, which can enhance the sealing effect between the floating core and the upper cover;

3. the floating core is provided with a positioning column, so that the floating core can be inserted into the vent of the upper cover without deviation;

4. the bottom of the floating core is provided with an inner cavity with a downward opening, and water flow can act on the inner cavity to enhance upward acting force.

Drawings

The utility model is further illustrated by the following figures and examples.

Fig. 1 is a perspective view of a backflow prevention device according to a preferred embodiment.

Fig. 2 is an exploded view of the backflow prevention device according to a preferred embodiment.

Fig. 3 is a schematic perspective view of the body.

Fig. 4 is a schematic perspective view of the upper cover.

Fig. 5 is a schematic perspective view of the floating core.

FIG. 6 is a schematic view showing the use state of the present invention before water is introduced.

FIG. 7 is a second schematic view of the present invention in a water inlet state.

Fig. 8 is a third schematic view of the present invention in a use state after water supply is cut off.

100 body 110 inlet pipe 120 outlet pipe 130 inner ring wall 131 inner cavity 140 fixed part 150 outer ring wall 151 outer cavity

200 floating core 210 circular plate 220 positioning column 221 side wing plate 222 inner cavity

300 upper cover 310 cover 320 cylinder 330 air inlet

400 sealing piece

Detailed Description

Referring to fig. 1 and 2, a backflow prevention device includes a body 100, a floating core 200, an upper cover 300, and a sealing sheet 400.

Referring to fig. 3, the body 100 includes a cylindrical outer wall 150, the outer wall 150 is provided with a bottom plate 160 to close a bottom end, fixing portions 140 for fixing the body to other components are provided on an outer side wall, and a water inlet pipe 110 and a water outlet pipe 120 are provided at intervals in a circumferential direction. The upper surface of the bottom plate 160 is provided with an inner annular wall 130, the diameter of the inner annular wall 130 is smaller than that of the outer annular wall 150, the height of the inner annular wall 130 is smaller than that of the outer annular wall 150, and the height difference between the inner annular wall and the outer annular wall is the up-down moving space of the floating core. The body 100 further comprises a water inlet pipe 110 and a water outlet pipe 120, wherein the water inlet pipe 110 respectively penetrates through the outer ring wall 150 and the inner ring wall 130 from outside to inside, and is communicated with an inner cavity 131 defined by the inner ring wall 130. The outlet pipe 120 passes through the outer annular wall 150 from the outside to the inside, and is communicated with the outer cavity 151 between the outer annular wall 150 and the inner annular wall 130.

Referring to fig. 4, the upper cover 300 covers the open upper end of the body 100, the upper cover 300 includes a circular cover 310 and a cylinder 320 disposed on the upper surface of the cover 310, and a circular vent 330 is disposed in the middle of the cover 310.

Referring to fig. 5, the floating core 200 includes a circular plate 210 and positioning posts 220 disposed on the upper surface of the circular plate, wherein the side surfaces of the positioning posts 220 are provided with side plates 221 extending in the vertical direction, and in this embodiment, the number of the side plates 221 is 4, and the side plates are disposed around the outer circumferential surface of the positioning posts 220 at intervals of 90 degrees. Meanwhile, an inner cavity 222 is formed in the positioning column 220, the inner cavity 222 is open downward, and the opening is located on the lower surface of the circular plate 210. And preferably, the cross section of the inner cavity 222 is gradually enlarged from top to bottom, i.e. it is a trumpet shape with a downward big mouth. The diameter of the circular plate 210 is smaller than the inner diameter of the outer annular wall 150 and larger than the outer diameter of the inner annular wall 130.

Referring to fig. 2, the sealing plate 400 is circular and is sleeved on the fixing column of the floating core 200, and the lower surface of the sealing plate is attached to the upper surface of the circular plate 210 of the floating core 200.

Referring to fig. 6, during installation, the sealing sheet 400 is sleeved on the floating core 200, then the floating core and the sealing sheet are placed inside the body 100, the upper cover 300 is covered, and the upper cover 300 and the upper end of the body 100 are fixed. The fixing mode can be various existing modes such as interference fit, screw connection and the like. The positioning post 220 of the floating core 200 is inserted into the cylinder 320 through the vent 300. Since the diameter of the circular plate 210 of the floating core is smaller than the inner diameter of the outer annular wall 150 of the main body and larger than the outer diameter of the inner annular wall 130, the floating core 200 covers the inner annular wall 130.

Referring to fig. 7, when water or other fluid enters the inner annular wall 130 from the inlet pipe 110, the floating core 200 moves upward under the force of the fluid until the upper surface of the sealing plate 400 is engaged with the lower surface of the upper cover 300, and the communication between the vent 330 and the inner cavity of the body 100 is blocked. The water passes over the top of the inner annular wall 130 and exits the outlet pipe 120.

Referring to fig. 8, after water or other fluid stops, the floating core 200 drops due to gravity, and due to the presence of the side wings, there is a ventilation gap between the fixed column 220 and the inner wall of the cylinder 320 of the upper cover, and since the diameter of the circular plate 210 of the floating core is smaller than the inner diameter of the outer circular wall 150 of the main body and larger than the outer diameter of the inner circular wall 130, there is also a ventilation gap between the outer circular plate wall of the floating core and the inner circular wall of the outer circular wall, and at this time, due to the dropping of the floating core 200, the upper surface of the sealing plate 400 is separated from the lower surface of the upper cover 300, and therefore, external air can enter the inside of the main body 100 to play a role of preventing backflow.

In other embodiments, the outer and inner annular walls may be square, triangular, etc., respectively.

In other embodiments, the water inlet pipe 110 may also be provided at the center of the bottom plate 160.

The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the utility model, which is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention device is characterized in that: the method comprises the following steps:

the body comprises a cylindrical outer ring wall, the lower end of the outer ring wall is provided with a bottom plate for closing the bottom end, the bottom plate is provided with an inner ring wall which is coaxial with the outer ring wall, the diameter of the inner ring wall is smaller than that of the outer ring wall, and the height of the inner ring wall is also smaller than that of the outer ring wall; the water inlet pipe is communicated with an inner cavity formed by the inner annular wall, and the water outlet pipe is communicated with outer cavities between the outer annular wall and the inner annular wall;

the upper cover covers the upper end opening of the outer ring wall; the upper cover is arranged at the opening of the body and is provided with an air vent;

2. A backflow prevention device as claimed in claim 1, wherein: the water inlet pipe penetrates through the outer ring wall and the inner ring wall from outside to inside and is communicated with an inner cavity formed by the inner ring wall.

3. A backflow prevention device as claimed in claim 1, wherein: the water inlet pipe penetrates through the bottom of the bottom plate and is communicated with an inner cavity formed by the inner ring wall.

4. A backflow prevention device as claimed in claim 1, wherein: in the second position, the engagement of the floating core with the upper cover is between the upper surface of the floating core and the lower surface of the upper cover.

5. A backflow prevention device as claimed in claim 4, wherein: the upper surface of the floating core is also provided with a sealing sheet.

6. A backflow prevention device as claimed in claim 1, wherein: the upper cover include the lid with locate the cylinder of lid upper surface, be the blow vent in the middle of the lid.

7. A backflow prevention device according to claim 1 or 6, wherein: the floating core comprises a circular plate and a positioning column arranged on the upper surface of the circular plate, and the positioning column is inserted into the vent hole of the upper cover.

8. A backflow prevention device as claimed in claim 7, wherein: an inner cavity is arranged in the positioning column, the inner cavity is opened downwards, and the opening is positioned on the lower surface of the circular plate.

9. A backflow prevention device as claimed in claim 8, wherein: the opening of the inner cavity is in a horn shape, and the large opening of the inner cavity faces downwards.

10. A backflow prevention device as claimed in claim 7, wherein: the side of the positioning column is provided with 2-4 side wing plates extending in the vertical direction, and the side wing plates are arranged around the peripheral surface of the positioning column at intervals.