CN218913848U - Quick draining decompression type backflow preventer - Google Patents
Quick draining decompression type backflow preventer Download PDFInfo
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- CN218913848U CN218913848U CN202223486036.4U CN202223486036U CN218913848U CN 218913848 U CN218913848 U CN 218913848U CN 202223486036 U CN202223486036 U CN 202223486036U CN 218913848 U CN218913848 U CN 218913848U
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- 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
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Abstract
The utility model discloses a quick draining decompression type backflow preventer, which comprises: the three-way valve comprises a three-way shell, two check valves, a baffle plate assembly, a diaphragm assembly and a valve rod which are oppositely arranged; wherein the bottom of the three-way shell is provided with a water drain valve; the two check valves are respectively positioned at two ends of the three-way shell and divide the interior of the three-way shell into a P1 cavity, a P2 cavity and a P3 cavity; the baffle plate component is arranged in the P2 cavity and is provided with a movable cavity; the diaphragm assembly is arranged in the movable cavity and divides the movable cavity into a P1 upper cavity and a P3 upper cavity, and the diaphragm assembly is fixed with the inner wall of the tee shell; one end of the valve rod is fixed with the water drain valve, the other end of the valve rod is fixed with the diaphragm assembly, and the top of the valve rod is in sliding connection with the three-way shell; the cavity wall of the P1 cavity is provided with a first channel, so that the P1 cavity is communicated with the P1 upper cavity; the cavity wall of the P3 cavity is provided with a second channel, so that the P3 cavity is communicated with the P3 upper cavity. The utility model can improve stability, prevent the leakage of the water draining device, reduce production cost and shorten delivery cycle.
Description
Technical Field
The utility model relates to a quick water discharge pressure-reducing backflow preventer, and belongs to the technical field of backflow preventers.
Background
The backflow preventer (backflow preventer) is a device which is composed of non-return parts and can prevent the backflow of water in a water supply pipeline, and is mainly used for urban water supply, and a water supply unit is a water control combination device which strictly limits the pressure water in the pipeline to flow in one direction only when the water supply unit supplies water to a common pollution unit. The device has the function of absolutely preventing the medium in the pipeline from flowing back or siphoning back under any working condition so as to achieve the purpose of avoiding backflow pollution.
The drain device of the like product at present uses spring force to push back the drain device in order to reach the drainage purpose, along with backflow preventer service life's growth, some accessories can ageing like: the water draining device is in a closed state for a long time, the spring at the bottom of the water draining device can be reduced in elasticity due to the fact that the spring is kept in a compressed state for a long time, the ideal state can not be restored any more, the spring is disabled, mechanical death is caused, and the whole water draining switch is blocked and fails to drain water. Or when the instantaneous flow speed is too high, the disturbance of the water flow to the water drain device causes the phenomenon of short dripping of the sealing of the water drain device. The above problems become more apparent with the increase of the service life. Most products on the market today have difficulty avoiding the above problems.
In order to increase the service life and facilitate maintenance, one structure in the existing product is that a P3 upper cavity is arranged below the P1 upper cavity, then the P3 upper cavity and the P3 are connected by a single peripheral pipeline to form a communicating vessel, and the pressure difference between the water inlet of the valve and the water return after the valve is utilized to open the water drain. However, this structure is slightly insufficient in reaction speed and strength of the drainer, resulting in poor stability, drip of the drainer, and high complexity of cost production and assembly.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the quick water discharge decompression type backflow preventer can improve stability, prevent the water discharge device from dripping, reduce production cost and shorten delivery cycle.
The technical problems to be solved by the utility model are realized by adopting the following technical scheme:
a quick drain pressure-reducing backflow preventer, comprising:
the bottom of the three-way shell is provided with a water drain valve;
two check valves which are oppositely arranged are respectively positioned at two ends of the inside of the three-way shell, and divide the inside of the three-way shell into a P1 cavity, a P2 cavity and a P3 cavity;
the baffle plate component is transversely arranged in the P2 cavity and is provided with a movable cavity with the top cavity of the three-way shell;
the diaphragm assembly is transversely arranged in the movable cavity, the movable cavity is divided into a P1 upper cavity and a P3 upper cavity, and two ends of the diaphragm assembly extend to the inner wall of the tee shell and are fixedly connected with the inner wall of the tee shell;
one end of the valve rod is fixedly connected with the water drain valve, the other end of the valve rod passes through the center of the partition plate assembly and is fixedly connected with the diaphragm assembly, and the top of the valve rod is in sliding connection with the top of the three-way shell;
a first channel is arranged on the cavity wall of the P1 cavity, and the first channel is communicated with the P1 cavity and the P1 upper cavity;
the cavity wall of the P3 cavity is provided with a second channel, and the second channel is communicated with the P3 cavity and the P3 upper cavity.
Preferably, the separator assembly includes:
the center of the partition plate is provided with a through hole, the valve rod penetrates through the through hole, two ends of the inner wall of the P2 cavity are provided with limiting tables, and the partition plate is fixed on the limiting tables;
and the check ring is fixed on the outer edge of the partition plate and is embedded with the inner wall of the tee shell.
Preferably, O-shaped sealing rings are arranged in the through holes and at the outer edges of the partition plates.
Preferably, a valve cover is arranged at the top of the three-way shell, and the diaphragm assembly comprises:
the edge of the diaphragm is fixedly connected by the valve cover, a small hole is formed in the center of the diaphragm, and the valve rod penetrates through the small hole;
the diaphragm pressing plates are arranged on the upper surface and the lower surface of the diaphragm and are mutually propped against each other;
the piston is fixed at the center of the valve cover and fixedly connected with the diaphragm pressing plate, and the valve rod is arranged in the piston and moves up and down along the vertical direction.
Preferably, the check valve comprises a main check valve and a secondary check valve, wherein the main check valve is communicated with the P1 cavity and the P2 cavity, and the secondary check valve is communicated with the P2 cavity and the P3 cavity.
Preferably, the main check valve includes: the main valve seat is fixed on the inner wall of the P1 cavity, one end of the main valve seat, which is positioned in the P2 cavity, is covered with a front check valve disc, a main valve rod is transversely fixed on the front check valve disc, a main spring is wound on the main valve rod, one end of the main spring is clamped on the main valve seat, and the other end of the main spring is fixed with a main spring seat.
Preferably, O-shaped sealing rings are arranged between the main valve seat and the inner wall of the P1 cavity and between the front check valve disc and the main valve seat.
Preferably, the sub check valve includes: the auxiliary valve seat is fixed on the inner wall of the P3 cavity, one end of the auxiliary valve seat, which is positioned in the P2 cavity, is covered with a rear check valve disc, an auxiliary valve rod is transversely fixed on the rear check valve disc, an auxiliary spring is wound on the auxiliary valve rod, one end of the auxiliary spring is clamped on the auxiliary valve seat, and the other end of the auxiliary spring is fixed with the auxiliary spring seat.
Preferably, O-shaped sealing rings are arranged between the auxiliary valve seat and the inner wall of the P3 cavity and between the rear check valve disc and the auxiliary valve seat.
Preferably, the drain valve includes: the water draining valve seat is provided with a guide vane nut, the guide vane nut is provided with a spacer, the spacer is provided with a water draining pressing plate, the water draining pressing plate is provided with a water draining sealing ring, the water draining sealing ring is provided with a water draining valve disc, and the water draining sealing ring can be sealed with the bottom of the three-way shell.
The beneficial effects of the utility model are as follows:
the utility model solves the problem of the reduced stability of the water discharge function of the existing backflow preventer, thereby preventing the phenomenon of transient drip of the sealing of the water discharge device when the instantaneous flow speed is too high; meanwhile, the situation that the water cannot be drained due to long-term stressed deformation, elastic force reduction of the spring can be avoided. Specifically, the water draining device of the similar product solves the problems by arranging the P3 upper cavity and connecting the P3 upper cavity with the P3 through a pipeline, and utilizing the pressure difference between the P1 and the P3 and the Bernoulli effect; the utility model improves the mode of connecting the P3 upper cavity with P3 on the basis, and the original technology is to connect the P3 upper cavity with P3 by externally lapping a pipeline, which has the defects of long processing time and long assembly. The utility model connects the P3 upper cavity and the P3 through one pipeline from the inside, skillfully omits an external pipeline, has simple structure but no reduction in functions, reduces the working hours of production and assembly, further reduces the production cost, shortens the shipment period, and adopts the P1 and P3 upper cavities with larger areas to further improve the comprehensive performance of the drainer.
Drawings
Fig. 1 is a schematic cross-sectional structure of the present utility model.
In the figure: 1. the valve comprises an outer hexagonal nut, 2, a guide vane nut, 3, a water discharge valve seat, 4, an O-shaped ring, 5, a spacer bush, 6, a water discharge pressing plate, 7, a water discharge sealing ring, 8, a water discharge valve disc, 9, a three-way shell, 10, a valve rod, 11, an O-shaped sealing ring, 12, a front check valve disc, 13, a rear check valve disc, 14, a main valve seat, 15, a main spring seat, 16, a main valve rod, 17, a hexagonal nut, 18, a main spring, 19, a secondary spring seat, 20, a secondary valve seat, 21, a secondary valve rod, 22, a secondary spring, 23, a diaphragm pressing plate, 24, a diaphragm, 26, a piston, 27, a piston sleeve, 28, a jackscrew, 29, a valve cover, 30, a partition plate, 31, a retainer ring, 32, a P1 cavity, 33, a P2 cavity, 34, a P3 cavity, 35, a P1 upper cavity, 36, a P3 upper cavity, 37, a first channel, 38 and a second channel.
Detailed Description
The utility model will be further described with reference to the following embodiments in order to make the technical means, the creation features, the achievement of the objects and the effects of the utility model easy to understand.
In the description of the present utility model, it should be understood that the terms "transverse", "longitudinal", "end", "edge", "side wall", "upper", "lower", "directly above", "surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "end", "head", "tail", etc. refer to the orientation or positional relationship based on the drawings, are merely for convenience of describing the technical solution of the present utility model and for simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Examples
As shown in fig. 1, a rapid drainage pressure-reducing type backflow preventer comprises: the three-way shell 9, two opposite check valves, a baffle plate assembly, a diaphragm assembly and a valve rod 10; wherein, the bottom of the three-way shell 9 is provided with a water drain valve; the two check valves are respectively arranged at two ends of the inside of the three-way shell 9, and divide the inside of the three-way shell 9 into a P1 cavity 32, a P2 cavity 33 and a P3 cavity 34; the baffle plate component is transversely arranged in the P2 cavity 33 and leaves a movable cavity with the top cavity of the three-way shell 9; the diaphragm assembly is transversely arranged in the movable cavity, the movable cavity is divided into a P1 upper cavity 35 and a P3 upper cavity 36, and two ends of the diaphragm assembly extend to the inner wall of the three-way shell 9 and are fixedly connected with the inner wall of the three-way shell 9; one end of the valve rod 10 is fixedly connected with the water drain valve, the other end of the valve rod 10 passes through the center of the partition plate assembly and is fixedly connected with the diaphragm assembly, and the top of the valve rod 10 is in sliding connection with the top of the three-way shell 9; the cavity wall of the P1 cavity 32 is provided with a first channel 37, and the first channel 37 is communicated with the P1 cavity 32 and the P1 upper cavity 35; the cavity wall of the P3 cavity 34 is provided with a second channel 38, and the second channel 38 is communicated with the P3 cavity 34 and the P3 upper cavity 36.
Wherein, the baffle subassembly includes: a baffle 30 and a retainer 31; wherein, a through hole is arranged at the center of the baffle plate 30, the valve rod 10 penetrates through the through hole, two ends of the inner wall of the P2 cavity 33 are provided with limiting tables, and the baffle plate 30 is fixed on the limiting tables; the retainer ring 31 is fixed to the outer edge of the diaphragm 30 and is embedded with the inner wall of the three-way housing 9. In order to sufficiently secure the sealability, O-rings 11 are installed in the through holes and at the outer edges of the partition plates 30.
Wherein, the top of tee bend casing 9 is through bolt fixedly connected with valve gap 29, and the diaphragm subassembly includes: a diaphragm 24, a diaphragm pressing plate 23, a piston 26; wherein, the edge of the diaphragm 24 is pressed by the valve cover 29 and the outer edge of the three-way shell 9, a small hole is arranged at the center of the diaphragm 24, and the valve rod 10 passes through the small hole; the diaphragm pressing plate 23 is placed on the upper and lower surfaces of the diaphragm 24 and clamps the diaphragm 24; the piston 26 is fixed at the center of the valve cover 29 and is fixedly connected with the diaphragm pressing plate 23 through a hexagonal nut 17 (specifically, a piston sleeve 27 is installed at the center of the valve cover 29 through a jackscrew 28, the piston 26 is placed in the piston sleeve 27), and the valve rod 10 is placed in the piston 26 and moves up and down in the vertical direction.
The check valve comprises a main check valve and an auxiliary check valve, wherein the main check valve is communicated with the P1 cavity 32 and the P2 cavity 33, and the auxiliary check valve is communicated with the P2 cavity 33 and the P3 cavity 34.
Wherein, the main check valve includes: the main valve seat 14 is fixed on the inner wall of the P1 cavity 32, one end of the main valve seat 14, which is positioned in the P2 cavity 33, is covered with the front check valve disc 12, the front check valve disc 12 is transversely fixed with the main valve rod 16, the main valve rod 16 is wound with the main spring 18, one end of the main spring 18 is clamped on the main valve seat 14, and the other end is fixed with the main spring 18 seat 15. In order to increase the sealing performance, O-shaped sealing rings 11 are arranged between the main valve seat 14 and the inner wall of the P1 cavity 32 and between the front check valve disc 12 and the main valve seat 14.
Wherein, the auxiliary check valve includes: the auxiliary valve seat 20 is fixed on the inner wall of the P3 cavity 34, one end of the auxiliary valve seat 20, which is positioned in the P2 cavity 33, is covered with the rear check valve disc 13, the rear check valve disc 13 is transversely fixed with the auxiliary valve rod 21, the auxiliary valve rod 21 is wound with the auxiliary spring 22, one end of the auxiliary spring 22 is clamped on the auxiliary valve seat 20, and the other end is fixed with the auxiliary spring 22 seat 19. In order to increase the sealing performance, O-shaped sealing rings 11 are arranged between the auxiliary valve seat 20 and the inner wall of the P3 cavity 34 and between the rear check valve disc 13 and the auxiliary valve seat 20.
Wherein, the drain valve includes: the water draining valve seat 3 is in sealing connection with the outlet at the bottom of the three-way shell 9 through the O-shaped ring 4, the guide vane nut 2 is arranged on the water draining valve seat 3, the spacer bush 5 is arranged on the guide vane nut 2, the water draining pressing plate 6 is arranged on the spacer bush 5, the water draining sealing ring 7 is arranged on the water draining pressing plate 6, the water draining valve disc 8 is arranged on the water draining sealing ring 7, and the water draining sealing ring 7 can be sealed with the bottom of the three-way shell 9. The guide vane nut 2 is sleeved on the valve rod 10 and is fixed through the outer hexagon nut 1.
Because the check valve and the water drain valve in the utility model are valve bodies in the prior art, the specific working principle of the check valve and the water drain valve is not repeated.
The working principle of the utility model is as follows:
when the medium water flows through the inside of the valve body, the medium water sequentially passes through the P1 cavity 32, the P2 cavity 33 and the P3 cavity 34, and when the medium water flows from the P1 cavity 32 to the P2 cavity 33, the pressure of the medium water pushes away the front check valve disc 12, the front check valve disc 12 drives the main spring 18 to compress towards the medium water flowing direction, and the resistance of the front check valve disc 12 and the reverse acting force of the main spring 18 enable P1 to be more than P2. When the medium water flows from the P2 cavity 33 to the P3 cavity 34, the pressure of the medium water pushes away the rear check valve disc 13, the rear check valve disc 13 drives the spring to compress in the direction of the medium water flow, and the resistance of the rear check valve disc 13 and the reverse acting force of the secondary spring 22 make P2> P3, so that P1> P2> P3 can be known.
When the pressure of the cavity P1 32 is transmitted to the cavity P1 upper cavity 35 through the first channel 37, the cavity P1 upper cavity 35 drives the valve rod 10 to press downwards, and the valve rod 10 drives the drain valve disc 8 to seal with the drain valve seat 3. And because of the bernoulli effect (the phenomenon that when the fluid speed is increased, the pressure at the interface between the object and the fluid is reduced, and conversely, the pressure is increased), when the medium water flows through the P3 cavity 34, the flow rate of the fluid flowing through the second channel 38 to the P3 upper cavity 36 is reduced, so that the pressure of the P3 upper cavity 36 is reduced, the sealing force of the water drain is increased, and the sealing effect is better as the water flow is faster and the sealing force is greater.
When water is stopped, the cavity 32 of the cavity P1 is in pressure loss, the cavity 36 on the cavity P3 drives the valve rod 10 to apply pressure upwards due to the backwater pressure P3> P1, and the valve rod drives the water discharge valve disc 8 to break the seal with the water discharge valve seat 3, so that accumulated water in the cavity 33 of the cavity P2 is discharged.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be appreciated by persons skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the spirit and scope of the utility model as hereinafter claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a quick draining decompression formula backflow preventer which characterized in that includes:
the bottom of the three-way shell is provided with a water drain valve;
two check valves which are oppositely arranged are respectively positioned at two ends of the inside of the three-way shell, and divide the inside of the three-way shell into a P1 cavity, a P2 cavity and a P3 cavity;
the baffle plate component is transversely arranged in the P2 cavity and is provided with a movable cavity with the top cavity of the three-way shell;
the diaphragm assembly is transversely arranged in the movable cavity, the movable cavity is divided into a P1 upper cavity and a P3 upper cavity, and two ends of the diaphragm assembly extend to the inner wall of the tee shell and are fixedly connected with the inner wall of the tee shell;
one end of the valve rod is fixedly connected with the water drain valve, the other end of the valve rod passes through the center of the partition plate assembly and is fixedly connected with the diaphragm assembly, and the top of the valve rod is in sliding connection with the top of the three-way shell;
a first channel is arranged on the cavity wall of the P1 cavity, and the first channel is communicated with the P1 cavity and the P1 upper cavity;
the cavity wall of the P3 cavity is provided with a second channel, and the second channel is communicated with the P3 cavity and the P3 upper cavity.
2. A quick drain pressure reducing backflow preventer according to claim 1 wherein the diaphragm assembly comprises:
the center of the partition plate is provided with a through hole, the valve rod penetrates through the through hole, two ends of the inner wall of the P2 cavity are provided with limiting tables, and the partition plate is fixed on the limiting tables;
and the check ring is fixed on the outer edge of the partition plate and is embedded with the inner wall of the tee shell.
3. The rapid drainage pressure-reducing backflow preventer of claim 2, wherein the O-ring is installed at the outer edges of the partition plate and the inside of the through hole.
4. The rapid drain pressure reducing backflow preventer of claim 1, wherein the top of the three-way housing is provided with a valve cover, and the diaphragm assembly comprises:
the edge of the diaphragm is fixedly connected by the valve cover, a small hole is formed in the center of the diaphragm, and the valve rod penetrates through the small hole;
the diaphragm pressing plates are arranged on the upper surface and the lower surface of the diaphragm and are mutually propped against each other;
the piston is fixed at the center of the valve cover and fixedly connected with the diaphragm pressing plate, and the valve rod is arranged in the piston and moves up and down along the vertical direction.
5. The rapid drain pressure-reducing backflow preventer of claim 1, wherein the check valve comprises a main check valve and a secondary check valve, the main check valve communicates with the P1 cavity and the P2 cavity, and the secondary check valve communicates with the P2 cavity and the P3 cavity.
6. The rapid drain pressure reducing type backflow preventer of claim 5, wherein the main check valve comprises: the main valve seat is fixed on the inner wall of the P1 cavity, one end of the main valve seat, which is positioned in the P2 cavity, is covered with a front check valve disc, a main valve rod is transversely fixed on the front check valve disc, a main spring is wound on the main valve rod, one end of the main spring is clamped on the main valve seat, and the other end of the main spring is fixed with a main spring seat.
7. The rapid drainage pressure-reducing backflow preventer of claim 6, wherein O-rings are provided between the main valve seat and the inner wall of the P1 cavity, and between the front check valve disc and the main valve seat.
8. The rapid drain pressure reducing type backflow preventer of claim 5, wherein the secondary check valve comprises: the auxiliary valve seat is fixed on the inner wall of the P3 cavity, one end of the auxiliary valve seat, which is positioned in the P2 cavity, is covered with a rear check valve disc, an auxiliary valve rod is transversely fixed on the rear check valve disc, an auxiliary spring is wound on the auxiliary valve rod, one end of the auxiliary spring is clamped on the auxiliary valve seat, and the other end of the auxiliary spring is fixed with the auxiliary spring seat.
9. The rapid drainage pressure-reducing backflow preventer of claim 8, wherein O-rings are arranged between the auxiliary valve seat and the inner wall of the P3 cavity, and between the rear check valve disc and the auxiliary valve seat.
10. The rapid drain pressure reducing backflow preventer of claim 1, wherein the drain valve comprises: the water draining valve seat is provided with a guide vane nut, the guide vane nut is provided with a spacer, the spacer is provided with a water draining pressing plate, the water draining pressing plate is provided with a water draining sealing ring, the water draining sealing ring is provided with a water draining valve disc, and the water draining sealing ring can be sealed with the bottom of the three-way shell.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202223486036.4U CN218913848U (en) | 2022-12-26 | 2022-12-26 | Quick draining decompression type backflow preventer |
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Application Number | Priority Date | Filing Date | Title |
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CN202223486036.4U CN218913848U (en) | 2022-12-26 | 2022-12-26 | Quick draining decompression type backflow preventer |
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CN218913848U true CN218913848U (en) | 2023-04-25 |
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CN202223486036.4U Active CN218913848U (en) | 2022-12-26 | 2022-12-26 | Quick draining decompression type backflow preventer |
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CN (1) | CN218913848U (en) |
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2022
- 2022-12-26 CN CN202223486036.4U patent/CN218913848U/en active Active
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