CN216923209U - Flow control valve with backflow prevention structure - Google Patents
Flow control valve with backflow prevention structure Download PDFInfo
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- CN216923209U CN216923209U CN202220377867.9U CN202220377867U CN216923209U CN 216923209 U CN216923209 U CN 216923209U CN 202220377867 U CN202220377867 U CN 202220377867U CN 216923209 U CN216923209 U CN 216923209U
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Abstract
The utility model discloses a flow control valve with a backflow prevention structure, which comprises a flow control valve body, wherein a liquid inlet cavity of the flow control valve body is communicated with an upstream end of urban water supply, a liquid outlet cavity of the flow control valve body is communicated with a downstream end of the urban water supply, the side wall of the liquid inlet cavity is communicated with the backflow prevention structure, a flow detector arranged at the upstream end of the urban water supply is connected with a flow control pilot valve, the side end of the backflow prevention structure is communicated with the flow control pilot valve, the top end of the backflow prevention structure is communicated with the liquid outlet cavity, one end of the flow control pilot valve is communicated with a liquid outlet cavity, and one end of the flow control pilot valve is communicated with an upper control cavity of a main valve. The backflow prevention structure is provided with the reversing valve core which can block the backflow prevention channel or the main valve control channel and is directly connected to the downstream control channel through the backflow prevention channel, so that backflow water can enter the backflow prevention structure in a shunting manner and can be cut off and closed in a backflow state in time.
Description
Technical Field
The utility model belongs to the technical field of flow control valves, and particularly relates to a flow control valve with a backflow prevention structure.
Background
The flow control valve is a common valve structure in a water supply pipe network or a liquid supply pipe network as the name implies, the flow control valve can adjust and control the liquid flow in the pipe network, and the flow control valve does not influence the effect of a downstream pipeline when the pressure in a main pipe changes.
In an urban water supply network, a flow control valve with a backflow prevention structure is needed, and the existing flow control valve does not have the backflow prevention function.
Disclosure of Invention
The utility model is provided for solving the problems in the prior art, and aims to provide a flow control valve with a backflow prevention structure.
The technical scheme of the utility model is as follows: a flow control valve with a backflow prevention structure comprises a flow control valve body, wherein a liquid inlet cavity of the flow control valve body is communicated with an upstream end of urban water supply, a liquid outlet cavity of the flow control valve body is communicated with a downstream end of the urban water supply, the side wall of the liquid inlet cavity is communicated with the backflow prevention structure, a flow detector arranged at the upstream end of the urban water supply is connected with a flow control pilot valve, the side end of the backflow prevention structure is communicated with the flow control pilot valve, the top end of the backflow prevention structure is communicated with a liquid outlet cavity, one end of the flow control pilot valve is communicated with the liquid outlet cavity, and one end of the flow control pilot valve is communicated with an upper control cavity of a main valve.
Furthermore, the flow detector comprises a rear detection channel and a front detection channel, and the rear detection channel and the front detection channel are connected in parallel.
Furthermore, a flow control pilot valve membrane is arranged in the flow control pilot valve, and the flow control pilot valve membrane divides a control cavity of the flow control pilot valve into an upper flow control pilot valve control cavity and a lower flow control pilot valve control cavity.
Furthermore, the rear detection channel is communicated with the upper control cavity of the flow control pilot valve, and the front detection channel is communicated with the lower control cavity of the flow control pilot valve.
Furthermore, a main valve control diaphragm is arranged in the flow control valve body, the main valve control diaphragm and the inner wall of the flow control valve body are enclosed to form a main valve control upper cavity, and a control upper cavity channel communicated with the flow control pilot valve is arranged on the outer wall of the main valve control upper cavity.
Furthermore, a main valve stem is arranged at the position of the main valve control diaphragm, and a main valve plate is arranged on the main valve stem.
Furthermore, the side end of the backflow prevention structure is communicated with the flow control pilot valve through a flow control channel.
The top end of the backflow prevention structure is communicated with a downstream control channel through a backflow prevention channel, and the downstream control channel is communicated with the liquid outlet cavity.
Further, one end of the flow control pilot valve is connected into the downstream control passage through a three-way joint.
Furthermore, the top of each of the liquid inlet cavity and the liquid outlet cavity forms a connecting channel, and the connecting channels penetrate through the main valve control membrane.
The utility model sets an external main valve control channel at the liquid inlet cavity, connects with a backflow prevention structure through the main valve control channel, sets a reversing valve core in the backflow prevention structure to block the backflow prevention channel or the main valve control channel, and directly connects to a downstream control channel through the backflow prevention channel, thereby enabling backflow water to be shunted and enter the backflow prevention structure, and timely cutting off and closing the backflow state.
Drawings
FIG. 1 is a schematic diagram of the normally closed state of the present invention;
FIG. 2 is a schematic view of the normally open configuration of the present invention;
FIG. 3 is a schematic structural view of a backflow-free structure in a backflow prevention mode according to the present invention;
FIG. 4 is a schematic structural view of a backflow prevention structure in a backflow prevention state according to the present invention;
FIG. 5 is an enlarged schematic view of the backflow prevention structure of FIG. 1;
FIG. 6 is an enlarged schematic view of the flow control pilot valve of FIG. 1;
FIG. 7 is an enlarged schematic view of the backflow prevention structure of FIG. 4;
FIG. 8 is an enlarged schematic view of the flow control pilot valve of FIG. 4;
wherein:
1 urban water supply upstream end 2 urban water supply downstream end
3 flow control valve body 4 main valve plate
5 main valve stem 6 main valve controlling diaphragm
7 main valve control upper chamber 8 main valve control channel
9 control upper chamber passageway 10 prevents structure of flowing backwards
11 reversing spring 12 reversing valve core
13 flow control passage 14 backflow prevention passage
15 flow control pilot valve 16 flow control pilot valve upper chamber
17 flow control pilot valve control lower chamber 18 flow control pilot valve diaphragm
19 flow control pilot valve core 20 flow control pilot valve needle valve
21 downstream control channel 22 flow detector
23 rear detection channel 24 front detection channel
25 top seal 26 bottom seal
The posts are mounted 27.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1 to 8, a flow control valve with a backflow prevention structure comprises a flow control valve body 3, wherein a liquid inlet cavity of the flow control valve body 3 is communicated with an upstream end 1 of municipal water supply, a liquid outlet cavity of the flow control valve body is communicated with a downstream end 2 of the municipal water supply, the side wall of the liquid inlet cavity is communicated with a backflow prevention structure 10, a flow detector 22 arranged at the upstream end 1 of the municipal water supply is connected with a flow control pilot valve 15, the side end of the backflow prevention structure 10 is communicated with the flow control pilot valve 15, the top end of the backflow prevention structure 10 is communicated with the liquid outlet cavity, one end of the flow control pilot valve 15 is communicated with the liquid outlet cavity, and one end of the flow control pilot valve 15 is communicated with an upper control cavity 7 of a main valve.
The flow detector 22 comprises a rear detection channel 23 and a front detection channel 24, and the rear detection channel 23 and the front detection channel 24 are connected in parallel.
The flow control pilot valve 15 is provided with a flow control pilot valve membrane 18, and the flow control pilot valve membrane 18 divides a control chamber of the flow control pilot valve 15 into a flow control pilot upper chamber 16 and a flow control pilot lower chamber 17.
The rear detection channel 23 is communicated with the flow control pilot upper cavity 16, and the front detection channel 24 is communicated with the flow control pilot lower cavity 17.
The flow control valve body 3 is internally provided with a main valve control diaphragm 6, the main valve control diaphragm 6 and the inner wall of the flow control valve body 3 are enclosed to form a main valve control upper cavity 7, and the outer wall of the main valve control upper cavity 7 is provided with a control upper cavity channel 9 communicated with a flow control pilot valve 15.
The main valve control diaphragm 6 department is provided with main valve rod 5, be provided with main valve plate 4 on the main valve rod 5.
The side end of the backflow prevention structure 10 is communicated with a flow control pilot valve 15 through a flow control passage 13.
The top end of the backflow preventing structure 10 is communicated with a downstream control channel 21 through a backflow preventing channel 14, and the downstream control channel 21 is communicated with a liquid outlet cavity.
One end of the flow control pilot valve 15 is connected to the downstream control passage 21 through a three-way joint.
And connecting channels are formed at the tops of the liquid inlet cavity and the liquid outlet cavity and penetrate through the main valve control diaphragm 6.
The connecting channel of the liquid inlet cavity is communicated with a main valve control channel 8, and the main valve control channel 8 is communicated with the bottom of a backflow prevention structure 10.
The flow control pilot valve diaphragm 18 is connected to a flow control pilot valve spool 19.
Correspondingly, a flow control pilot valve needle valve 20 is further arranged in the flow control pilot valve 15, and the flow control pilot valve needle valve 20 is used for flow division.
Yet another embodiment
A flow control valve with a backflow prevention structure comprises a flow control valve body 3, wherein a liquid inlet cavity of the flow control valve body 3 is communicated with an upstream end 1 of urban water supply, a liquid outlet cavity of the flow control valve body is communicated with a downstream end 2 of the urban water supply, the side wall of the liquid inlet cavity is communicated with the backflow prevention structure 10, a flow detector 22 arranged at the upstream end 1 of the urban water supply is connected with a flow control pilot valve 15, the side end of the backflow prevention structure 10 is communicated with the flow control pilot valve 15, the top end of the backflow prevention structure 10 is communicated with a liquid outlet cavity, one end of the flow control pilot valve 15 is communicated with the liquid outlet cavity, and one end of the flow control pilot valve 15 is communicated with an upper control cavity 7 of a main valve.
The flow detector 22 comprises a rear detection channel 23 and a front detection channel 24, and the rear detection channel 23 and the front detection channel 24 are connected in parallel.
The flow control pilot valve 15 is provided with a flow control pilot valve diaphragm 18, and the flow control pilot valve diaphragm 18 divides a control cavity of the flow control pilot valve 15 into a flow control pilot valve upper cavity 16 and a flow control pilot valve lower cavity 17.
The rear detection channel 23 is communicated with the flow control pilot upper cavity 16, and the front detection channel 24 is communicated with the flow control pilot lower cavity 17.
The flow control valve body 3 is internally provided with a main valve control diaphragm 6, the main valve control diaphragm 6 and the inner wall of the flow control valve body 3 are enclosed to form a main valve control upper cavity 7, and the outer wall of the main valve control upper cavity 7 is provided with a control upper cavity channel 9 communicated with a flow control pilot valve 15.
The main valve control diaphragm 6 department is provided with main valve rod 5, be provided with main valve plate 4 on the main valve rod 5.
The side end of the backflow prevention structure 10 is communicated with a flow control pilot valve 15 through a flow control passage 13.
The top end of the backflow preventing structure 10 is communicated with a downstream control channel 21 through a backflow preventing channel 14, and the downstream control channel 21 is communicated with a liquid outlet cavity.
One end of the flow control pilot valve 15 is connected to the downstream control passage 21 through a three-way joint.
And connecting channels are formed at the tops of the liquid inlet cavity and the liquid outlet cavity and penetrate through the main valve control diaphragm 6.
The connecting channel of the liquid inlet cavity is communicated with a main valve control channel 8, and the main valve control channel 8 is communicated with the bottom of a backflow prevention structure 10.
The flow control pilot valve diaphragm 18 is connected to a flow control pilot valve spool 19.
Correspondingly, a flow control pilot valve needle valve 20 is further arranged in the flow control pilot valve 15, and the flow control pilot valve needle valve 20 is used for flow division.
The backflow prevention structure 10 comprises an outer sleeve body, an upper bushing and a lower bushing are arranged in the outer sleeve body, a sliding reversing valve core 12 is arranged in the upper bushing and the lower bushing, and the reversing valve core 12 can block a backflow prevention channel 14 at the top or a main valve control channel 8 at the bottom.
Correspondingly, the outer walls of the upper bushing and the lower bushing are provided with sealing rings, and the sealing rings realize the sealing of the upper bushing, the lower bushing and the outer sleeve.
The reversing valve core 12 is in a step shape with a convex middle part, and a reversing spring 11 is arranged at the bottom of the reversing valve core 12.
Correspondingly, the bottom of the reversing valve core 12 forms a mounting column 27, and the reversing spring 11 is sleeved on the mounting column 27 for fixing.
The upper part of the reversing valve core 12 is provided with a top seal 25, the lower part of the reversing valve core 12 is provided with a bottom seal 26, the top seal 25 blocks the backflow prevention channel 14, and the bottom seal 26 blocks the main valve control channel 8.
The working process of the utility model is as follows:
normal flow control operating condition
The water pressure of the upstream end 1 of the urban water supply is high, water flows from the upstream end 1 of the urban water supply to the flow control valve body 3 and then flows to the downstream end 2 of the urban water supply, meanwhile, the flow detector 22, namely a pitot tube, starts to work, the front detection channel 24 is connected with the lower cavity 17 of the flow control pilot valve 15, the rear detection channel-23 is connected with the upper cavity 16 of the flow control pilot valve 15, the medium flow change of the upstream end 1 of the urban water supply is controlled by induction through the flow detector 22, the pressure change fed back to the front detection channel 24 and the rear detection channel 23 is promoted to change the pressure of the upper cavity and the lower cavity of the flow control pilot valve, the flow control pilot valve diaphragm 18 is driven to be compared with the preset flow control value, and the opening amount of the flow control pilot valve-19 is adjusted.
At this time, the pressure water flows to the backflow prevention structure 10 through the upstream control channel 8, the reversing valve core 12 is under the action of the reversing spring 11, the upper sealing port of the backflow prevention structure 10 is closed, the lower sealing port is opened, the pressure water flows to the flow control channel 13, enters the flow control pilot valve 15 and is divided through the flow control pilot valve needle valve 19, wherein the upper cavity channel 9 is controlled in one line to flow to the main valve control upper cavity; the other line flows to a downstream control channel 21 and a city water supply downstream end-2 through the split flow of the valve core 19 of the flow control pilot valve.
When the flow value of the upstream end 1 of the urban water supply is lower than a preset flow value, the pressure difference value between the pressure water of a front detection channel 24 and the pressure water of a rear detection channel 23 of the flow detector 22 is reduced, and the pressure difference value between an upper cavity and a lower cavity of the flow control pilot valve is reduced in the same way, under the condition of being lower than the preset flow control value, the flow control pilot valve membrane 18 is driven to descend, so that the opening amount of a valve core 19 of the flow control pilot valve is increased, the pressure water from the flow control channel 13 to the flow control pilot valve 15 is less, and the water is shunted to a downstream control channel 21; when the pressure from the upper control cavity channel 9 to the upper main valve control cavity 7 is reduced, the main valve control diaphragm 6 drives the main valve rod 5 and the main valve plate 4 to move upwards, the opening of the main valve plate 4 is increased, the water supply amount of the upstream end 1 of the urban water supply to the downstream end 2 of the urban water supply is increased, and the urban water supply flow value is increased.
On the contrary, when the flow value of the upstream end 1 of the urban water supply is higher than the preset flow value, the pressure difference value between the pressure water of the front detection channel 24 and the pressure water of the rear detection channel 23 of the flow detector 22 is increased, and similarly, the pressure difference value between the upper chamber and the lower chamber of the flow control pilot valve is increased, under the condition of being higher than the preset flow control value, the flow control pilot valve diaphragm 18 is promoted to move upwards, so that the opening amount of the flow control pilot valve spool 19 is reduced, more pressure water is distributed from the flow control channel 13 to the flow control pilot valve 15, and less water is distributed to the downstream control channel 21; when the pressure from the upper control cavity channel 9 to the upper main valve control cavity 7 is increased, the main valve control diaphragm 6 drives the main valve rod 5 and the main valve plate 4 to move downwards, the opening amount of the main valve plate 4 is reduced, the water supply amount of the upstream end 1 of urban water supply to the downstream end 2 of urban water supply is reduced, and the urban water supply flow value is reduced.
Flow control valve system without backflow preventer, and no backflow preventer when pollution backflow occurs
The water pressure of the urban water supply downstream end 2 is high, water reversely flows into the flow control valve body 3 and the urban water supply upstream end 1, downstream pressure water enters the downstream control channel 21, then enters the flow control pilot valve 15, enters the flow control pilot valve core 19 (when the preset value of the flow control valve is not reached, the flow control pilot valve core-19 is in an open state), then pressure water is shunted, and a part of pressure water is reserved in the upstream control channel 8 through the flow control channel 13 and flows back to the upstream; the other part flows to the main valve control upper cavity 7 through the control upper cavity channel 9, but the flow control channel 13 branches part of the pressure water, so that the pressure of the main valve control upper cavity 7 is low, the main valve control diaphragm 6 cannot be promoted to drive the main valve rod 5 and the main valve plate to move downwards to close the main valve, and the downstream backflow water flows to the upstream through the main valve.
Flow control valve system with backflow prevention device for preventing backflow state when pollution backflow occurs
The water pressure of the city water supply downstream end 2 is high, the water reversely flows into the flow control valve body 3 and the city water supply upstream end 1, the downstream pressure water enters the downstream control channel 21 for shunting, part of the pressure water flows to the flow control pilot valve 15 through the downstream control channel 21 and flows to the flow control pilot valve plug 19 (when the preset value of the flow control valve is not reached, the flow control pilot valve plug-19 is in an open state), and then the pressure water enters the control upper cavity channel 9 and the main valve control upper cavity-7; meanwhile, the other part of the pressure water flows to the backflow prevention structure through the backflow prevention channel 14 and then presses the reversing valve core 12, the lower sealing port of the backflow prevention structure 10 is closed, the upper sealing port is opened, the flow control channel 13 is isolated from the upstream control channel 8, and backflow of the backflow water of the control channel system is avoided; meanwhile, the pressure water passes through the flow control channel 13 and the flow control pilot valve 15, flows through the flow control pilot valve needle valve 20, then converges, and enters the control upper cavity channel 9 and the main valve control upper cavity 7 (the pressure value of the main valve control upper cavity-7 is equal to the downstream pressure value, but the action area of the main valve control membrane-6 is larger than that of the main valve plate-4), so that the main valve control membrane 6 drives the main valve rod 5 and the main valve plate to move downwards to close the main valve, and the downstream backflow water cannot flow to the upstream through the main valve.
The utility model sets an external main valve control channel at the liquid inlet cavity, connects with a backflow prevention structure through the main valve control channel, sets a reversing valve core in the backflow prevention structure to block the backflow prevention channel or the main valve control channel, and directly connects to a downstream control channel through the backflow prevention channel, thereby enabling backflow water to be shunted and enter the backflow prevention structure, and timely cutting off and closing the backflow state.
Claims (10)
1. The utility model provides a flow control valve of anti-backflow structure in area, includes flow control valve body (3), the feed liquor chamber and the urban water supply upper reaches end (1) intercommunication of flow control valve body (3), its play liquid chamber and urban water supply low reaches end (2) intercommunication, its characterized in that: the side wall of the liquid inlet cavity is communicated with a backflow prevention structure (10), a flow detector (22) arranged at the upstream end (1) of urban water supply is connected with a flow control pilot valve (15), the side end of the backflow prevention structure (10) is communicated with the flow control pilot valve (15), the top end of the backflow prevention structure (10) is communicated with the liquid outlet cavity, one end of the flow control pilot valve (15) is communicated with the liquid outlet cavity, and one end of the flow control pilot valve (15) is communicated with a main valve control upper cavity (7).
2. The flow control valve with the backflow prevention structure as claimed in claim 1, wherein: the flow detector (22) comprises a rear detection channel (23) and a front detection channel (24), and the rear detection channel (23) and the front detection channel (24) are connected in parallel.
3. The flow control valve with the backflow preventing structure as claimed in claim 2, wherein: a flow control guide valve diaphragm (18) is arranged in the flow control guide valve (15), and the flow control guide valve diaphragm (18) divides a control cavity of the flow control guide valve (15) into a flow control guide valve control upper cavity (16) and a flow control guide valve control lower cavity (17).
4. The flow control valve with the backflow preventing structure as claimed in claim 3, wherein: the rear detection channel (23) is communicated with the flow control pilot valve control upper cavity (16), and the front detection channel (24) is communicated with the flow control pilot valve control lower cavity (17).
5. The flow control valve with the backflow preventing structure as claimed in claim 4, wherein: the flow control valve is characterized in that a main valve control diaphragm (6) is arranged in the flow control valve body (3), the main valve control diaphragm (6) and the inner wall of the flow control valve body (3) are enclosed to form a main valve control upper cavity (7), and a control upper cavity channel (9) communicated with a flow control pilot valve (15) is arranged on the outer wall of the main valve control upper cavity (7).
6. The flow control valve with the backflow preventing structure as claimed in claim 5, wherein: the main valve control diaphragm (6) is provided with a main valve rod (5), and a main valve plate (4) is arranged on the main valve rod (5).
7. The flow control valve with the backflow preventing structure as claimed in claim 6, wherein: the side end of the backflow prevention structure (10) is communicated with a flow control pilot valve (15) through a flow control channel (13).
8. The flow control valve with the backflow preventing structure as claimed in claim 7, wherein: the top end of the backflow prevention structure (10) is communicated with a downstream control channel (21) through a backflow prevention channel (14), and the downstream control channel (21) is communicated with the liquid outlet cavity.
9. The flow control valve with the backflow preventing structure according to claim 8, wherein: one end of the flow control pilot valve (15) is connected into a downstream control channel (21) through a three-way joint.
10. The flow control valve with the backflow prevention structure as claimed in claim 9, wherein: and the tops of the liquid inlet cavity and the liquid outlet cavity form a connecting channel, and the connecting channel penetrates through the main valve control diaphragm (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220377867.9U CN216923209U (en) | 2022-02-24 | 2022-02-24 | Flow control valve with backflow prevention structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220377867.9U CN216923209U (en) | 2022-02-24 | 2022-02-24 | Flow control valve with backflow prevention structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216923209U true CN216923209U (en) | 2022-07-08 |
Family
ID=82267635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220377867.9U Active CN216923209U (en) | 2022-02-24 | 2022-02-24 | Flow control valve with backflow prevention structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216923209U (en) |
-
2022
- 2022-02-24 CN CN202220377867.9U patent/CN216923209U/en active Active
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