CN114593216A - Non-resistance backflow preventer of double butterfly valves - Google Patents

Non-resistance backflow preventer of double butterfly valves Download PDF

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Publication number
CN114593216A
CN114593216A CN202210382179.6A CN202210382179A CN114593216A CN 114593216 A CN114593216 A CN 114593216A CN 202210382179 A CN202210382179 A CN 202210382179A CN 114593216 A CN114593216 A CN 114593216A
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CN
China
Prior art keywords
cavity
butterfly valve
diaphragm control
substructure
diaphragm
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Granted
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CN202210382179.6A
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Chinese (zh)
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CN114593216B (en
Inventor
洪荣坤
张正龙
刘杰
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Zhongheng Water Technology Co ltd
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Zhongheng Water Technology Co ltd
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Priority to CN202210382179.6A priority Critical patent/CN114593216B/en
Publication of CN114593216A publication Critical patent/CN114593216A/en
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Publication of CN114593216B publication Critical patent/CN114593216B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/48—Attaching valve members to screw-spindles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/50—Preventing rotation of valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F16K27/0218—Butterfly valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
    • F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
    • F16K7/17—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being actuated by fluid pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/15—Leakage reduction or detection in water storage or distribution

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Driven Valves (AREA)
  • Details Of Valves (AREA)

Abstract

The invention discloses a double butterfly valve resistance-free backflow preventer, which comprises a front end butterfly valve, a rear end butterfly valve and a middle cavity between the front end butterfly valve and the rear end butterfly valve which are connected in series, wherein the front end butterfly valve is communicated with the upstream end of urban water supply, the rear end butterfly valve is communicated with the downstream end of the urban water supply, the lower part of the front end butterfly valve is provided with a No. I substructure, the No. I substructure is communicated with the upstream end of the urban water supply and the middle cavity, the lower part of the rear end butterfly valve is provided with a No. II substructure, the No. II substructure is communicated with the downstream end of the urban water supply, and a diaphragm is arranged between the No. I substructure and the No. II substructure to control an external channel of an upper cavity. According to the invention, the front-end butterfly valve and the rear-end butterfly valve are connected in series through the middle cavity, the lower structures capable of preventing backflow are arranged at the bottoms of the front-end butterfly valve and the rear-end butterfly valve, and one end of the lower structure of the rear-end butterfly valve of the external channel of the upper cavity is controlled to be communicated with the upstream end of the urban water supply through the diaphragm.

Description

Non-resistance backflow preventer of double butterfly valves
Technical Field
The invention belongs to the technical field of pipe network backflow prevention, and particularly relates to a double butterfly valve resistance-free backflow preventer.
Background
The butterfly valve is a valve body commonly used in a liquid pipe network, generally comprises a valve body, a valve rod and a disc plate, the rotation of the disc plate is driven by the valve rod, the adjusting function of the on-off of liquid in the valve body is realized, and a sealing ring is arranged in the valve body.
However, at present, no resistance-free backflow prevention structure for the butterfly valve exists.
Disclosure of Invention
The invention provides a double butterfly valve non-resistance backflow preventer, which aims to solve the problems in the prior art.
The technical scheme of the invention is as follows: the utility model provides a two butterfly valves non-resistance backflow preventer, includes front end butterfly valve, rear end butterfly valve and the middle chamber between the two of establishing ties mutually, front end butterfly valve and city water supply upper reaches end intercommunication, rear end butterfly valve and city water supply low reaches end intercommunication, anterior segment butterfly valve lower part is provided with No. I substructure, No. I substructure and city water supply upper reaches end, middle chamber intercommunication, rear end butterfly valve lower part is provided with No. II substructure, No. II substructure and city water supply low reaches end intercommunication, be provided with diaphragm control epicoele external channel between No. I substructure, No. II substructure.
Furthermore, a backflow prevention function external connection channel is arranged on the outer wall of the No. II lower structure and communicated with the front end butterfly valve and the rear end butterfly valve.
Furthermore, a water draining membrane is arranged in the No. I lower structure, and divides a cavity in the No. I lower structure into a front membrane control upper cavity and a middle cavity membrane control lower cavity.
Furthermore, the No. I substructure comprises a front diaphragm control upper cavity channel communicated with the upstream end of the urban water supply, and the other end of the front diaphragm control upper cavity channel is communicated with the front diaphragm control upper cavity in the No. I substructure.
Furthermore, the No. I substructure comprises a middle cavity diaphragm control lower cavity communicated with the middle cavity, and the other end of the middle cavity diaphragm control lower cavity is communicated with the middle cavity diaphragm control lower cavity.
Furthermore, a sealing diaphragm is arranged in the lower part structure II, and the sealing diaphragm divides a cavity in the lower part structure II into a rear diaphragm control upper cavity and a rear diaphragm control lower cavity.
Furthermore, the No. II substructure comprises a diaphragm control lower cavity channel communicated with the downstream end of the urban water supply, and the diaphragm control lower cavity channel is communicated with the rear diaphragm control lower cavity.
Furthermore, the No. I substructure is externally connected with a diaphragm control upper cavity external channel, the diaphragm control upper cavity external channel is communicated with the front diaphragm control upper cavity, and the other end of the diaphragm control upper cavity external channel is communicated with the rear diaphragm control upper cavity.
Furthermore, a backflow water drainage channel is formed in the No. I lower structure, the flowing water drainage channel is communicated with the lower cavity controlled by the middle cavity diaphragm, and the drainage diaphragm controls the flowing water drainage channel to be connected with the lower cavity controlled by the middle cavity to be disconnected.
Furthermore, a backflow prevention function inner channel is formed in the No. II lower structure, one end of the backflow prevention function inner channel is communicated with the rear diaphragm control lower cavity, and the sealing diaphragm controls the backflow prevention function inner channel and the diaphragm control lower cavity to be switched on and off.
According to the invention, the front-end butterfly valve and the rear-end butterfly valve are connected in series through the middle cavity, the lower structures capable of preventing backflow are arranged at the bottoms of the front-end butterfly valve and the rear-end butterfly valve, and one end of the lower structure of the rear-end butterfly valve of the external channel of the upper cavity is controlled to be communicated with the upstream end of the urban water supply through the diaphragm.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged view of the installation of the drainage membrane of the present invention;
FIG. 3 is an enlarged view of the installation of the sealing diaphragm of the present invention;
FIG. 4 is an assembly view of the backflow prevention push rod of the present invention;
wherein:
1 urban water supply upstream end 2 urban water supply downstream end
3 front segment butterfly valve and 4 rear end butterfly valve
5 middle cavity 6 front diaphragm control upper cavity channel
Front diaphragm control upper cavity 8 water drainage diaphragm 7
9 middle cavity diaphragm controlled lower cavity and 10 middle cavity controlled lower cavity channel
11 backflow water drainage channel 12 diaphragm control upper cavity external channel
13 rear diaphragm control upper chamber 14 sealing diaphragm
15 reversing valve core 16 diaphragm control lower cavity channel
17 back diaphragm control lower cavity 18 prevents internal passage of refluence function
19 pressure relief spring 20 pressure relief passage
21 backflow-preventing function and upper valve rod of external channel 22
23 valve body side anti-backflow functional channel 24 upper valve rod internal anti-backflow channel
25 upper valve rod, upper sealing sleeve 26, upper valve rod sealing support sleeve
27 upper valve stem lower sealing sleeve 28 anti-backflow push rod
29 valve plate upper pin 30 return spring
31 valve plate lower pin 32 lower valve rod
33 the backflow prevention valve plate closes the torsion spring.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in figures 1-4, a two butterfly valves non-resistance backflow preventer, including front end butterfly valve 3, rear end butterfly valve 4 and the intermediate chamber 5 between the two that establish ties mutually, front end butterfly valve 3 and city water supply upper reaches end 1 intercommunication, rear end butterfly valve 4 and city water supply low reaches end 2 intercommunication, 3 lower parts of anterior segment butterfly valve are provided with No. I substructure, No. I substructure and city water supply upper reaches end 1, intermediate chamber 5 intercommunication, rear end butterfly valve 4 lower part is provided with No. II substructure, No. II substructure and city water supply low reaches end 2 intercommunication, be provided with diaphragm control epicoele external channel 12 between No. I substructure, No. II substructure.
And an anti-backflow external channel 21 is arranged on the outer wall of the No. II lower structure, and the anti-backflow external channel 21 is communicated with the front-end butterfly valve 3 and the rear-end butterfly valve 4.
A water drainage membrane 8 is arranged in the No. I lower structure, and the water drainage membrane 8 divides a cavity in the No. I lower structure into a front membrane control upper cavity 7 and a middle cavity membrane control lower cavity 9.
The No. I substructure comprises a front diaphragm control upper cavity channel 6 communicated with the urban water supply upstream end 1, and the other end of the front diaphragm control upper cavity channel 6 is communicated with a front diaphragm control upper cavity 7 in the No. I substructure.
No. I substructure includes middle chamber diaphragm control cavity 9 with middle chamber 5 intercommunication, the other end and the middle chamber diaphragm control cavity 9 intercommunication of middle chamber diaphragm control cavity 9 of middle chamber diaphragm.
A sealing diaphragm 14 is arranged in the lower part structure II, and the sealing diaphragm 14 separates a cavity in the lower part structure II into a rear diaphragm control upper cavity 13 and a rear diaphragm control lower cavity 17.
No. II substructure includes the diaphragm control cavity of resorption passageway 16 with city water supply downstream end 2 intercommunication, diaphragm control cavity of resorption passageway 16 and back diaphragm control cavity of resorption 17 intercommunication.
The No. I lower structure is externally connected with a membrane control upper cavity external channel 12, the membrane control upper cavity external channel 12 is communicated with the front membrane control upper cavity 7, and the other end of the membrane control upper cavity external channel 12 is communicated with the rear membrane control upper cavity 13.
A backflow water drainage channel 11 is formed in the No. I lower structure, the flowing water drainage channel 11 is communicated with the middle cavity diaphragm control lower cavity 9, and the drainage diaphragm 8 controls the flowing water drainage channel 11 and the middle cavity diaphragm control lower cavity 10 to be switched on and off.
And a backflow prevention functional inner channel 18 is formed in the No. II lower structure, one end of the backflow prevention functional inner channel 18 is communicated with the rear diaphragm control lower cavity 17, and the sealing diaphragm 14 controls the on-off of the backflow prevention functional inner channel 18 and the diaphragm control lower cavity channel 16.
The diaphragm control lower cavity channel 16 is an L-shaped channel, the processing mode is drilling processing, and correspondingly, the transverse section of the diaphragm control lower cavity channel 16 is blocked by a plug.
The middle cavity control lower cavity channel 10 is an L-shaped channel, the processing mode is drilling processing, and correspondingly, the transverse section of the middle cavity control lower cavity channel 10 is plugged through a plug.
A reversing valve core 15 is arranged in the backflow prevention function inner channel 18, and the outer wall of the reversing valve core 15 is communicated with a backflow prevention function outer connecting channel 21.
The tail part of the reversing valve core 15 forms a pressure relief channel 20, and a pressure relief spring 19 for suppressing the reversing valve core 15 is further arranged at the position of the reversing valve core 15.
Correspondingly, the external channel 21 with the backflow prevention function comprises a main channel and two branch channels, and the two branch channels are connected in parallel at the output end of the main channel. The two branch channels are respectively connected to the front end butterfly valve 3 and the rear end butterfly valve 4.
The water discharge membrane 8 can block the backflow water discharge channel 11 downwards, at the moment, the backflow water discharge channel 11 is disconnected with the middle cavity control lower cavity channel 10, and when the water discharge membrane 8 is separated from the backflow water discharge channel 11, the backflow water discharge channel 11 is communicated with the middle cavity control lower cavity channel 10.
The sealing diaphragm 14 can block the backflow-preventing function inner channel 18 downwards, at the moment, the backflow-preventing function inner channel 18 and the diaphragm control lower cavity channel 16 are disconnected, and when the sealing diaphragm 14 is separated from the backflow-preventing function inner channel 18, the backflow-preventing function inner channel 18 and the diaphragm control lower cavity channel 16 are communicated.
The upper structures of the front end butterfly valve 3 and the rear end butterfly valve 4 are the same.
Yet another embodiment
The utility model provides a two butterfly valves non-resistance backflow preventer, includes front end butterfly valve 3, rear end butterfly valve 4 and the middle chamber 5 between the two of establishing ties mutually, front end butterfly valve 3 and city water supply upstream end 1 intercommunication, rear end butterfly valve 4 and city water supply downstream end 2 intercommunication, 3 lower parts of anterior segment butterfly valve are provided with No. I substructure, No. I substructure and city water supply upstream end 1, middle chamber 5 intercommunication, rear end butterfly valve 4 lower part is provided with No. II substructure, No. II substructure and city water supply downstream end 2 intercommunication, be provided with diaphragm control epicoele external connection 12 between No. I substructure, No. II substructure.
And an anti-backflow external channel 21 is arranged on the outer wall of the No. II lower structure, and the anti-backflow external channel 21 is communicated with the front-end butterfly valve 3 and the rear-end butterfly valve 4.
A water drainage membrane 8 is arranged in the No. I lower structure, and the water drainage membrane 8 divides a cavity in the No. I lower structure into a front membrane control upper cavity 7 and a middle cavity membrane control lower cavity 9.
The No. I substructure comprises a front diaphragm control upper cavity channel 6 communicated with the urban water supply upstream end 1, and the other end of the front diaphragm control upper cavity channel 6 is communicated with a front diaphragm control upper cavity 7 in the No. I substructure.
The No. I lower structure comprises a middle cavity diaphragm control lower cavity 9 communicated with the middle cavity 5, and the other end of the middle cavity diaphragm control lower cavity 9 is communicated with the middle cavity diaphragm control lower cavity 9.
And a sealing diaphragm 14 is arranged in the No. II substructure, and the sealing diaphragm 14 separates the cavity in the No. II substructure into a rear diaphragm control upper cavity 13 and a rear diaphragm control lower cavity 17.
No. II substructure includes the diaphragm control cavity of resorption passageway 16 with city water supply downstream end 2 intercommunication, diaphragm control cavity of resorption passageway 16 and back diaphragm control cavity of resorption 17 intercommunication.
The No. I lower structure is externally connected with a membrane control upper cavity external channel 12, the membrane control upper cavity external channel 12 is communicated with the front membrane control upper cavity 7, and the other end of the membrane control upper cavity external channel 12 is communicated with the rear membrane control upper cavity 13.
A backflow water drainage channel 11 is formed in the No. I lower structure, the flowing water drainage channel 11 is communicated with the middle cavity diaphragm control lower cavity 9, and the drainage diaphragm 8 controls the flowing water drainage channel 11 and the middle cavity diaphragm control lower cavity 10 to be switched on and off.
Form in the No. II substructure and prevent the internal passage 18 of refluence function, prevent that refluence function internal passage 18 one end and back diaphragm control cavity of resorption 17 communicate, the break-make of sealed diaphragm 14 control prevent refluence function internal passage 18 and diaphragm control cavity of resorption passageway 16.
The diaphragm control lower cavity channel 16 is an L-shaped channel, the processing mode is drilling processing, and correspondingly, the transverse section of the diaphragm control lower cavity channel 16 is blocked by a plug.
The middle cavity control lower cavity channel 10 is an L-shaped channel, the processing mode is drilling processing, and correspondingly, the transverse section of the middle cavity control lower cavity channel 10 is blocked by a plug.
A reversing valve core 15 is arranged in the backflow prevention function inner channel 18, and the outer wall of the reversing valve core 15 is communicated with a backflow prevention function outer connecting channel 21.
The tail part of the reversing valve core 15 forms a pressure relief channel 20, and a pressure relief spring 19 for suppressing the reversing valve core 15 is further arranged at the position of the reversing valve core 15.
Correspondingly, the external channel 21 with the backflow prevention function comprises a main channel and two branch channels, and the two branch channels are connected in parallel at the output end of the main channel. The two branch channels are respectively connected to the front end butterfly valve 3 and the rear end butterfly valve 4.
The water discharge membrane 8 can block the backflow water discharge channel 11 downwards, at the moment, the backflow water discharge channel 11 is disconnected with the middle cavity control lower cavity channel 10, and when the water discharge membrane 8 is separated from the backflow water discharge channel 11, the backflow water discharge channel 11 is communicated with the middle cavity control lower cavity channel 10.
The sealing diaphragm 14 can block the backflow-preventing function inner channel 18 downwards, at the moment, the backflow-preventing function inner channel 18 and the diaphragm control lower cavity channel 16 are disconnected, and when the sealing diaphragm 14 is separated from the backflow-preventing function inner channel 18, the backflow-preventing function inner channel 18 and the diaphragm control lower cavity channel 16 are communicated.
The upper structures of the front end butterfly valve 3 and the rear end butterfly valve 4 are the same.
The front end butterfly valve 3 and the rear end butterfly valve 4 both comprise an upper valve rod 22, an upper valve rod internal backflow prevention channel 24 is formed inside the upper valve rod 22, an upper valve rod upper sealing sleeve 25, an upper valve rod sealing support sleeve 26 and an upper valve rod lower sealing sleeve 27 are arranged in the valve body from top to bottom, and the upper valve rod 22 is arranged in the upper valve rod upper sealing sleeve 25, the upper valve rod sealing support sleeve 26 and the upper valve rod lower sealing sleeve 27.
The lateral wall of the valve body is provided with a valve body lateral surface backflow prevention functional channel 23, the valve body lateral surface backflow prevention functional channel 23 is communicated with a backflow prevention function external channel 21, a plurality of through holes are formed in the upper valve rod sealing support sleeve 26, the through holes are externally connected with the valve body lateral surface backflow prevention functional channel 23, and the through holes are communicated with an internal backflow prevention channel 24 of the upper valve rod.
And the bottom of the backflow preventing channel 24 in the upper valve rod is blocked by a plug.
And a transverse guide sealing hole is formed in the internal backflow preventing channel 24 of the upper valve rod and communicated with the internal backflow preventing channel 24 of the upper valve rod, and a sliding valve plate upper pin 29 is arranged in the transverse guide sealing hole.
The outer wall of the valve plate upper pin 29 forms a step part, a sealing groove is formed in the outer wall of the step part, and a sliding sealing ring is arranged in the sealing groove.
One end of the transverse guide sealing hole is in a step shape, so that the valve plate upper pin 29 can be conveniently placed in the transverse guide sealing hole, the limiting ring is screwed up at the same time, the valve plate upper pin 29 can slide in the limiting ring on one side, the limiting ring on the other side can limit the step part, and the valve plate upper pin 29 is prevented from sliding out.
A backflow prevention push rod 28 for locking is inserted into the transverse guide sealing hole, a return spring 30 is arranged at the tail of the backflow prevention push rod 28, and the other end of the return spring 30 abuts against the connecting head.
And lower valve rods 32 are arranged in the valve bodies of the front end butterfly valve 3 and the rear end butterfly valve 4, and the lower valve rods 32 are connected with the butterfly plate through a valve plate lower pin 31.
And a backflow preventing valve plate closing torsion spring 33 is arranged at the lower end of the lower valve rod 32.
The working process of the invention is as follows:
the double-butterfly valve resistance-free backflow preventer is composed of two backflow-preventing butterfly valves with backflow-preventing devices.
Normal off and on states: the pressure of a front end butterfly valve 3 with a backflow prevention device at the upstream end 1 of the urban water supply, a middle cavity 5 formed between two butterfly valves and a rear end butterfly valve 4 with the backflow prevention device is higher than that of the downstream end 2 of the urban water supply, at the moment, the pressure of a front diaphragm control upper cavity channel 6 and a diaphragm control upper cavity external connection channel 12, the pressure of the front diaphragm control upper cavity 7 and a rear diaphragm control upper cavity 13 of the two butterfly valves are high, and the water pressure of the front diaphragm control upper cavity channel is higher than that of a middle cavity control lower cavity channel 10, a diaphragm control lower cavity channel 16, a middle cavity diaphragm control lower cavity 9 and a rear diaphragm control lower cavity 17; the water discharge membrane 8 and the sealing membrane 14 are respectively pressed by the front membrane control upper cavity 7 and the rear membrane control upper cavity 13, so that the isolation of the middle cavity control lower cavity channel 10 and the backflow water discharge channel 11 is respectively ensured, and no water leakage of the middle cavity exists; meanwhile, the sealing ports in the sealing diaphragm 14 are ensured to block the flow of the diaphragm control lower cavity channel 16 and the diaphragm control lower cavity 17 to the backflow prevention function inner channel 18, and at this time, no pressure water exists in the backflow prevention function inner channel 18.
An upper sealing port of the reversing valve core 15 blocks the internal channel 18 with the backflow prevention function and the external channel 21 with the backflow prevention function under the action of a pressure relief spring 19; the backflow prevention function external channel 21 is communicated with the pressure relief channel 20 through a lower sealing port of the reversing valve core 15, and channels such as the backflow prevention function external channel 21, the backflow prevention function channel 23 on the side surface of the valve body, the backflow prevention function channel 24 in the upper valve rod and the like are in a pressure-free water state.
The backflow prevention push rod 28 of the system has no action, the valve plate upper pin 29 extends into the upper valve rod backflow prevention push rod 28 operation shaft hole under the action of the reset spring 30, the valve plate can be driven to rotate by locking the upper valve rod, and normal closing and opening of the two valves are guaranteed.
Simultaneously, the valve plate of two butterfly valves rotates simultaneously and passes through valve plate lower pin 31, drives down valve rod 32 and rotates: a backflow prevention valve plate closing torsion spring 33 is connected in a built-in shaft hole of the lower valve rod 31 in a chain mode, one end of the backflow prevention valve plate closing torsion spring 33 is fixedly connected with the lower valve rod, and the other end of the backflow prevention valve plate closing torsion spring 33 is fixedly connected with the lower valve cover. When the lower valve rod 32 rotates, the anti-backflow valve plate closing torsion spring 33 is tightly screwed, and screwing torque is generated.
Non-resistance backflow preventer with double butterfly valves and pollution backflow generation state
The pressure of the downstream end 2 of the urban water supply is high, the pressure of a rear end disc valve 4 with a backflow prevention device, a middle cavity 5 formed between two butterfly valves, a front end disc valve 3 with the backflow prevention device and the pressure of the upstream end 1 of the urban water supply are low, and at the moment, the pressure water of a diaphragm control lower cavity channel 16 and a diaphragm control lower cavity 17 is higher than that of a diaphragm control upper cavity channel 6, a diaphragm control upper cavity external channel 12 and a diaphragm control upper cavity 13; the diaphragm control lower cavity 17 jacks up the sealing diaphragm 14, the diaphragm control lower cavity 17 is communicated with the backflow prevention function inner channel 18, high-pressure water appears, the upper sealing port of the reversing valve core is pressed to be opened, the lower sealing port of the reversing valve core is pressed to be closed, high-pressure water in the backflow prevention function inner channel 18 flows to the backflow prevention function outer channel 21, the backflow prevention function channels 23 are arranged on the side faces of the valve bodies of the two butterfly valves, meanwhile, a closed space is formed by combining an upper valve rod sealing sleeve, an upper valve rod supporting sleeve with a plurality of small flow holes and an upper valve rod lower sealing sleeve, the high-pressure water flows to the backflow prevention function channel 24 in the upper valve rod, the high-pressure water pushes the backflow prevention push rod 8, the valve plate upper pin 29 is pushed to exit from the operation shaft hole of the upper valve rod, and the locking of the valve plate and the upper valve rod is avoided.
At this time, the backflow preventing valve plate closing torsion spring 33 is driven by the lower valve rod 32 and the valve plate lower pin 31 under the condition that the screwing torque is reset, so that the valve plates of the two butterfly valves rotate under the action of the screwing torque reset starting of the backflow preventing valve plate closing torsion spring 33 and the backflow water pressure, the sealing ports are freely closed, and the backflow preventing double-check function is achieved.
When the valve plates of the two butterfly valves are damaged in a sealing mode, when backflow water flows to the middle cavity, high-pressure water in the middle cavity 5 appears, the water pressure is higher than that of the upstream end 1 of urban water supply, at the moment, the pressure of the lower cavity channel 10 controlled by the middle cavity 5 and the pressure of the lower cavity 9 controlled by the middle cavity diaphragm are higher than that of the upper cavity channel 6 controlled by the diaphragm, the water drainage diaphragm 8 is opened, the backflow water in the middle cavity 5 flows out of the valve through the lower cavity channel 10 controlled by the middle cavity diaphragm, the lower cavity 9 controlled by the middle cavity diaphragm and the backflow water drainage channel 11, and the backflow pollution diffusion prevention function is achieved.
According to the invention, the front-end butterfly valve and the rear-end butterfly valve are connected in series through the middle cavity, the lower structures capable of preventing backflow are arranged at the bottoms of the front-end butterfly valve and the rear-end butterfly valve, and one end of the lower structure of the rear-end butterfly valve of the external channel of the upper cavity is controlled to be communicated with the upstream end of the urban water supply through the diaphragm.

Claims (10)

1. The utility model provides a two butterfly valves non-resistance backflow preventer which characterized in that: including front end butterfly valve (3), rear end butterfly valve (4) and intermediate chamber (5) between the two that establish ties mutually, front end butterfly valve (3) and city water supply upper reaches end (1) intercommunication, rear end butterfly valve (4) and city water supply low reaches end (2) intercommunication, anterior segment butterfly valve (3) lower part is provided with No. I substructure, No. I substructure and city water supply upper reaches end (1), intermediate chamber (5) intercommunication, rear end butterfly valve (4) lower part is provided with No. II substructure, No. II substructure and city water supply low reaches end (2) intercommunication, be provided with diaphragm control epicoele external access (12) between No. I substructure, No. II substructure.
2. A double butterfly valve non-resistance backflow preventer as claimed in claim 1, wherein: no. II substructure outer wall department is provided with prevents external passageway (21) of refluence function, prevent that external passageway (21) of refluence function communicates with front end butterfly valve (3), rear end butterfly valve (4).
3. A double butterfly valve non-resistance backflow preventer as claimed in claim 2, wherein: a water drainage membrane (8) is arranged in the No. I lower structure, and the water drainage membrane (8) divides a cavity in the No. I lower structure into a front membrane control upper cavity (7) and a middle cavity membrane control lower cavity (9).
4. A double butterfly valve non-resistance backflow preventer as claimed in claim 3, wherein: no. I substructure includes preceding diaphragm control epicoele passageway (6) with city water supply upstream end (1) intercommunication, preceding diaphragm control epicoele passageway (6) other end and the preceding diaphragm control epicoele (7) intercommunication in No. I substructure.
5. The double butterfly valve non-resistance backflow preventer of claim 4, wherein: no. I substructure includes middle chamber diaphragm control lower chamber (9) with middle chamber (5) intercommunication, the other end and the lower chamber of middle chamber diaphragm control (9) intercommunication of middle chamber diaphragm control lower chamber (9).
6. The double butterfly valve non-resistance backflow preventer of claim 5, wherein: a sealing diaphragm (14) is arranged in the No. II lower structure, and the sealing diaphragm (14) divides a cavity in the No. II lower structure into a rear diaphragm control upper cavity (13) and a rear diaphragm control lower cavity (17).
7. The double butterfly valve non-resistance backflow preventer of claim 6, wherein: no. II substructure includes diaphragm control cavity of resorption passageway (16) with city water supply downstream end (2) intercommunication, diaphragm control cavity of resorption passageway (16) and back diaphragm control cavity of resorption (17) intercommunication.
8. A double butterfly valve non-resistance backflow preventer as claimed in claim 7, wherein: no. I substructure is connected with diaphragm control epicoele external channel (12) outward, diaphragm control epicoele external channel (12) and preceding diaphragm control epicoele (7) intercommunication, diaphragm control epicoele external channel (12) other end and back diaphragm control epicoele (13) intercommunication.
9. A double butterfly valve non-resistance backflow preventer as claimed in claim 8, wherein: a backflow water drainage channel (11) is formed in the No. I lower structure, the backflow water drainage channel (11) is communicated with the middle cavity diaphragm control lower cavity (9), and the drainage diaphragm (8) controls the flowing water drainage channel (11) and the middle cavity diaphragm control lower cavity (10) to be switched on and off.
10. A double butterfly valve non-resistance backflow preventer as claimed in claim 9, wherein: form in the No. II substructure and prevent flowing backwards function interior passageway (18), prevent flowing backwards function interior passageway (18) one end and back diaphragm control cavity (17) intercommunication down, sealed diaphragm (14) control prevents flowing backwards function interior passageway (18) and the break-make of diaphragm control cavity of resorption passageway (16).
CN202210382179.6A 2022-04-13 2022-04-13 Double butterfly valve non-resistance backflow preventer Active CN114593216B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1182776A (en) * 1997-09-08 1999-03-26 Kurimoto Shoji Kk Pressure reduction type reverse flow preventing device
JP2003014147A (en) * 2001-06-27 2003-01-15 Maezawa Kyuso Industries Co Ltd Pressure reduction type reverse flow preventing device and check valve
CN103821969A (en) * 2014-01-28 2014-05-28 何际跃 Follow-up backflow preventer
CN205715845U (en) * 2016-04-20 2016-11-23 邵建农 Diaphragm-type butterfly control valve for water pump
CN211820884U (en) * 2019-11-29 2020-10-30 罗兰自控阀业（上海）有限公司 Non-pressure loss backflow preventer
CN215673630U (en) * 2021-07-18 2022-01-28 中恒水务科技有限公司 Electric butterfly valve with backflow prevention control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1182776A (en) * 1997-09-08 1999-03-26 Kurimoto Shoji Kk Pressure reduction type reverse flow preventing device
JP2003014147A (en) * 2001-06-27 2003-01-15 Maezawa Kyuso Industries Co Ltd Pressure reduction type reverse flow preventing device and check valve
CN103821969A (en) * 2014-01-28 2014-05-28 何际跃 Follow-up backflow preventer
CN205715845U (en) * 2016-04-20 2016-11-23 邵建农 Diaphragm-type butterfly control valve for water pump
CN211820884U (en) * 2019-11-29 2020-10-30 罗兰自控阀业（上海）有限公司 Non-pressure loss backflow preventer
CN215673630U (en) * 2021-07-18 2022-01-28 中恒水务科技有限公司 Electric butterfly valve with backflow prevention control

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