CN217130419U - Backflow preventer with low water loss - Google Patents
Backflow preventer with low water loss Download PDFInfo
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- CN217130419U CN217130419U CN202121481154.9U CN202121481154U CN217130419U CN 217130419 U CN217130419 U CN 217130419U CN 202121481154 U CN202121481154 U CN 202121481154U CN 217130419 U CN217130419 U CN 217130419U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 238000007789 sealing Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002384 drinking water standard Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The utility model provides a backflow preventer with low water loss, which belongs to the technical field of valves and comprises a valve body, a water inlet check valve, a water outlet check valve, a water inlet and a water outlet which are arranged at two ends of the valve body, a water inlet cavity, a middle cavity, a water outlet valve, an elastic component and a water outlet valve, wherein a diaphragm cavity is arranged in the middle cavity and is communicated with the water inlet cavity through a water pipe, the lower end of the water outlet valve is arranged in the middle cavity, the upper end of the water outlet valve is arranged in the diaphragm cavity, the water inlet check valve comprises a valve plate, one side of the valve plate, which is close to the middle cavity, is vertically and fixedly connected with the inner wall of a valve cover through the elastic component, one side of the valve plate, which is close to the water inlet, is provided with a magnetic component, the valve plate controls the water inlet check valve to be opened and closed through the resultant force of the elastic component and the magnetic component, the utility model has simple structure, is easy to be installed and maintained, and adopts a check mechanism formed by combining magnetic force and spring force, the resistance characteristic of the check valve is changed, and the pursuit of the reliability and low resistance of the check valve closing is effectively realized.
Description
Technical Field
The utility model belongs to the technical field of the valve, relate to the backflow preventer, especially relate to a backflow preventer of low water loss.
Background
The existing backflow preventer is divided into two types, namely a decompression type backflow preventer and a low-resistance backflow preventer, two products execute two different standards, namely GB/T25178 (decompression type) backflow preventer and JB/T11151 (low-resistance backflow preventer). The two standards have different definitions for the product. From the safety perspective of backflow pollution prevention, the pressure reduction type is safer, wherein GB50015 is explicitly described, the pressure reduction type is safer, and is applicable to all backflow pollution prevention media, and the low resistance is not applicable to dangerous working conditions; from the adaptability perspective, because the water supply pressure in China is not high, and in recent years, the water supply pressure is strictly controlled in order to save energy, reduce consumption and reduce leakage loss, the water supply network is unacceptable for the water loss of the pressure-reducing backflow preventer. In view of the above, it is necessary to develop a new backflow preventer having safety equivalent to that of a pressure-reducing type backflow preventer and water loss equivalent to low resistance.
SUMMERY OF THE UTILITY MODEL
The utility model provides a backflow preventer of low water loss, the resistance that adopts the check valve passes through spring force and realizes simultaneously with magnetic force, has reduced the resistance of check valve, the independent check valve of the installation and maintenance of being convenient for.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a backflow preventer of low water loss, includes valve body, the check valve that intakes, goes out the water check valve, sets up water inlet and delivery port at the valve body both ends, the intake antrum, the middle chamber, goes out the water cavity, the outlet valve, elastomeric element, the middle intracavity is equipped with the diaphragm chamber, the diaphragm chamber leads to pipe intercommunication with the intake antrum, the outlet valve lower extreme sets up at the middle intracavity, and the upper end sets up at the diaphragm intracavity, the check valve that intakes includes the valve plate, elastomeric element and the perpendicular fixed connection of valve gap inner wall are passed through to one side that the valve plate is close to the middle chamber, the valve plate is close to water inlet one side and is equipped with magnetic assembly, the valve plate passes through elastomeric element and magnetic assembly's the switching of controlling the check valve of intaking of resultant force.
Further, the check valve of intaking still includes disk seat, valve shaft, the valve plate sets up on the disk seat and the two clearance fit, valve shaft one end is passed the valve plate and is passed through nut fixed connection, the valve plate is close to intake antrum one side and is equipped with the cavity, magnetic force component sets up in the cavity bottom, magnetic force component includes permanent magnet and armature, the valve shaft other end passes the cavity vertical fixation and has armature, armature sets up in the cavity, armature reciprocates for the cavity with the valve shaft.
Furthermore, a drain opening of the drain valve is communicated with the outside air through a passage, the passage is arranged between the water inlet cavity and the water outlet cavity, the drain valve comprises a drain valve post, a drain valve plate is fixedly arranged at the lower end of the drain valve post, the drain valve post penetrates through the upper end of the middle cavity and is vertically and fixedly provided with a valve clack, the valve clack is arranged in the diaphragm cavity, the middle cavity and the diaphragm cavity are vertically separated through the valve clack of the drain valve, and one side, close to the middle cavity, of the valve clack is connected with the valve body through a spring.
Furthermore, the structure of the water outlet check valve is consistent with that of the water inlet check valve, the magnetic component in the water outlet check valve is arranged on one side close to the middle cavity, and the valve plate in the water outlet check valve is arranged on one side close to the water outlet cavity.
Furthermore, the water inlet cavity and the water outlet cavity are arranged in the valve body.
Further, the elastic component is a pressurizing spring.
Further, a valve top is arranged on the valve cover, the diaphragm cavity is arranged on the valve top, the valve top is connected with the valve cover through a nut, and the valve cover is fixedly connected with the valve body through a nut.
Furthermore, a water inlet cavity is formed between the end face of the water inlet and the seal of the valve seat of the water inlet check valve, an intermediate cavity is formed between the seal surface of the valve seat of the water inlet check valve and the seal surface of the valve seat of the water outlet check valve, and a water outlet cavity is formed between the seal surface of the valve seat of the water outlet check valve and the end face of the water outlet.
Further, the water release valve is arranged in the middle cavity, and a valve seat of the water release valve is arranged below the lowest position in the middle cavity.
Furthermore, between valve top and the valve gap, all be equipped with the sealing washer between valve gap and the valve body, the check valve that intakes and the check valve that goes out water all are equipped with the sealing washer with the valve body contact surface.
Compared with the prior art, the utility model has the advantages and positive effect as follows.
1. All performance parameters completely accord with the regulations of GB/T25178, the water loss is greatly reduced compared with the standard of GB/T25178, the water loss does not exceed 0.025MPa at the flow speed of 2 m/s, a check mechanism formed by combining magnetic force and spring force is adopted, the resistance characteristic of the check valve is changed, and the pursuit of the closure reliability and the incapability of high resistance of the check valve is effectively realized.
2. The resistance of the check valve is in a stable range (always maintained between 0.02MPa and 0.028 MPa) through the resultant force action of the magnetic force and the spring force, and the resistance of the valve is nearly constant under different opening degrees.
3. The upper cover type structure simplifies the installation and maintenance of the check valve, the check valve component is fixed in an integrally pressed mode, the coating in the valve body cannot be damaged, and all water passing positions in the valve are guaranteed to meet the drinking water standard.
Drawings
The accompanying drawings, which form a part of the present disclosure, are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and together with the description serve to explain the present disclosure. In the drawings:
fig. 1 is an overall schematic view of a backflow preventer with low water loss according to the present invention;
fig. 2 is a schematic view showing an internal structure of a backflow preventer with low water loss according to the present invention;
FIG. 3 is an enlarged view of the portion A of the backflow preventer with low water loss of the present invention shown in FIG. 2;
reference numerals:
1. a valve body; 101. a water inlet cavity; 102. a water outlet cavity; 103. a middle cavity; 104. a diaphragm chamber; 2. a valve cover; 3. a water inlet; 4. a water outlet; 5. a valve top; 6. a water inlet check valve; 601. a valve plate; 602. a valve shaft; 603. a cavity; 604. a permanent magnet; 605. an armature; 606. a valve seat; 7. a water outlet check valve; 8. an elastic member; 9, a pressure relief valve; 10. pressure relief is carried out; 11. a pipeline; 12. a spring.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1 to 3, a backflow preventer with low water loss comprises a valve body 1, a water inlet check valve 6, a water outlet check valve 7, a water inlet cavity 101, a middle cavity 103, a water outlet cavity 102, a water drain valve 9, an elastic component 8, a water inlet 3 and a water outlet 4 which are arranged at two ends of the valve body 1, a diaphragm cavity 104 is arranged in the middle cavity 103, the diaphragm cavity 104 is communicated with the water inlet cavity 101 through a water pipe 11, the lower end of the water drain valve 9 is arranged in the middle cavity 103, the upper end of the water drain valve is arranged in the diaphragm cavity 104, the water inlet check valve comprises a valve plate 601, one side of the valve plate 601 close to the middle cavity 103 is vertically and fixedly connected with the inner wall of a valve cover 2 through the elastic component 8, a magnetic assembly is arranged at one side of the valve plate 601 close to the water inlet, and the valve plate 601 controls the opening and closing of the water inlet check valve through the resultant force of the elastic component 8 and the magnetic assembly.
Preferably, the water inlet check valve 6 further comprises a valve seat 606 and a valve shaft 603, the valve plate 601 is arranged on the valve seat 606 and is in clearance fit with the valve seat 606, one end of the valve shaft 603 penetrates through the valve plate 601 and is fixedly connected with the valve plate 601 through a nut, a cavity is arranged on one side of the valve plate 601 close to the water inlet cavity, a magnetic assembly is arranged at the bottom of the cavity and comprises a permanent magnet 604 and an armature 605, the other end of the valve shaft 603 penetrates through the cavity and is vertically fixed with the armature 605, the armature 605 is arranged in the cavity, and the armature 605 and the valve shaft 603 move up and down relative to the cavity.
Preferably, a drain opening of the drain valve 9 is communicated with outside air through a passage 10, the passage 10 is arranged between the water inlet cavity 101 and the water outlet cavity 102, the drain valve 9 comprises a drain valve column 901, a drain valve plate 902 is fixedly arranged at the lower end of the drain valve column 901, a valve flap 903 is vertically and fixedly arranged at the upper end of the middle cavity 103 through the drain valve column 901, the valve flap 903 is arranged in the diaphragm cavity 104, the middle cavity 103 and the diaphragm cavity 104 are vertically separated through the valve flap 903 of the drain valve, and one side of the valve flap 903 close to the middle cavity is connected with the valve body 1 through a spring 12.
Preferably, the outlet check valve 7 is identical in structure to the inlet check valve 6, the armature in the outlet check valve 7 is disposed on the side of the intermediate chamber, and the valve plate in the outlet check valve 7 is disposed on the side close to the outlet chamber 102.
Preferably, the water outlet valve further comprises a valve cover 2, an intermediate cavity 103 is arranged in the valve cover 2, and a water inlet cavity 101 and a water outlet cavity 102 are arranged in the valve body 1.
Preferably, the elastic member 8 is a pressurizing spring.
Preferably, the valve cap 2 is provided with a valve top 5, the diaphragm cavity 104 is arranged in the valve top 5, the valve top 5 is connected with the valve cap 2 through a nut, and the valve cap 2 is fixedly connected with the valve body 1 through a nut.
Preferably, a water inlet cavity 101 is formed between the end face of the water inlet 3 and the valve seat seal of the water inlet check valve 6, an intermediate cavity 103 is formed between the valve seat seal face of the water inlet check valve 6 and the valve seat seal of the water outlet check valve 7, and a water outlet cavity 102 is formed between the valve seat seal face of the water outlet check valve 7 and the end face of the water outlet 4.
Preferably, the drain valve 9 is disposed in the intermediate chamber 104 with the valve seat of the drain valve 104 disposed below the lowest position in the intermediate chamber 104.
Preferably, between valve top 5 and valve gap 2, all be equipped with the sealing washer between valve gap 2 and the valve body 1, intake check valve 6 and play water check valve 7 all are equipped with the sealing washer with the valve body 1 contact surface.
In a closed state, the two-stage check valve closes the valve under the action of spring force and magnetic force, the magnetic force is maximum, the spring force is minimum, the resultant force is maximum, and the resultant force can achieve the opening pressure of the front check valve specified in GB/T25178 to be not lower than 0.02 MPa;
in the opening state, when the medium pressure is greater than 0.02MPa, the medium thrust is greater than the resultant force of the spring force and the magnetic force, the valve plate of the check valve is pushed open, the spring force gradually increases in the opening process of the check valve, the magnetic force rapidly decreases, the magnetic force approaches zero after a certain formation is reached, and the resistance of the check valve is completely generated by the spring force at the moment;
when the valve is completely opened, the water resistance of the valve is mainly generated by a check valve spring, and the secondary resistance is generated by channel friction, the two resistances form a pressure difference between the water inlet cavity and the middle cavity of the valve, the pressure difference is a front check valve pressure difference which is not less than 0.014MPa under a normal working condition and accords with the index of GB/T25178, and the rear check valve pressure difference is not less than 0.007 MPa.
When the system stops water supply, a pipeline is burst or other conditions causing medium backflow occur, the two-stage check valve is closed in advance before the medium backflow under the action of pressure difference, the water discharge opening is opened in advance when the pressure difference between the water discharge opening and the middle cavity before the valve is smaller than 0.014MPa, air isolation is carried out, the medium is ensured not to backflow, and even if negative pressure is generated in the upstream due to accidents such as burst, the middle cavity blocks the medium from being sucked into the main pipe through the air isolation, so that a water source is polluted.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All equal changes and improvements made within the scope of the present invention should still be included within the patent coverage of the present invention.
Claims (10)
1. A backflow preventer with low water loss is characterized by comprising a valve body (1), a water inlet check valve (6), a water outlet check valve (7), a water inlet cavity (101), a middle cavity (103), a water outlet cavity (102), a water drain valve (9), an elastic component (8), a water inlet (3) and a water outlet (4) which are arranged at two ends of the valve body (1),
a diaphragm cavity (104) is arranged in the middle cavity (103), the diaphragm cavity (104) is communicated with the water inlet cavity (101) through a water pipe (11), the lower end of the water drain valve (9) is arranged in the middle cavity (103), the upper end of the water drain valve is arranged in the diaphragm cavity (104),
the check valve of intaking includes valve plate (601) one side that valve plate (601) are close to intermediate chamber (103) is passed through elastomeric element (8) and valve gap (2) inner wall vertical fixation and is connected, valve plate (601) are close to water inlet one side and are equipped with magnetic assembly, the valve plate (601) control the switching of the check valve of intaking through elastomeric element (8) and magnetic assembly's resultant force.
2. A backflow preventer with low water loss according to claim 1, wherein the water inlet check valve (6) further comprises a valve seat (606) and a valve shaft (603), the valve plate (601) is arranged on the valve seat (606) and is in clearance fit with the valve seat (606), one end of the valve shaft (603) penetrates through the valve plate (601) and is fixedly connected with the valve plate through a nut, a cavity is formed in one side, close to the water inlet cavity, of the valve plate (601), the magnetic assembly is arranged at the bottom of the cavity and comprises a permanent magnet (604) and an armature (605), the other end of the valve shaft (603) penetrates through the cavity and is vertically fixed with the armature (605), the armature (605) is arranged in the cavity, and the armature (605) and the valve shaft (603) move up and down relative to the cavity.
3. A backflow preventer with low water loss according to claim 1, wherein a drain opening of the drain valve (9) is communicated with outside air through a passage (10), the passage (10) is arranged between the water inlet cavity (101) and the water outlet cavity (102), the drain valve (9) comprises a drain valve column (901), a drain valve plate (902) is fixedly arranged at the lower end of the drain valve column (901), a valve flap (903) is vertically and fixedly arranged at the upper end of the drain valve column (901) through the middle cavity (103), the valve flap (903) is arranged in the diaphragm cavity (104), the middle cavity (103) and the diaphragm cavity (104) are vertically separated through the valve flap (903) of the drain valve (9), and one side of the valve flap (903) close to the middle cavity (103) is connected with the valve body (1) through a spring (12).
4. A backflow preventer with low water loss according to claim 1, wherein the outlet check valve (7) is structurally identical to the inlet check valve (6), the magnetic member in the outlet check valve (7) is disposed at a side close to the intermediate chamber (103), and the valve plate in the outlet check valve (7) is disposed at a side close to the outlet chamber (102).
5. A backflow preventer with low water loss according to claim 1, further comprising a valve cover (2), wherein the intermediate chamber (103) is arranged in the valve cover (2), and the water inlet chamber (101) and the water outlet chamber (102) are arranged in the valve body (1).
6. A backflow preventer with low water loss according to claim 1, wherein the elastic member (8) is a pressurizing spring.
7. A backflow preventer with low water loss according to claim 1, wherein the valve cap (2) is provided with a valve top (5), the diaphragm cavity (104) is arranged on the valve top (5), the valve top (5) is connected with the valve cap (2) through a nut, and the valve cap (2) is fixedly connected with the valve body (1) through a nut.
8. A backflow preventer with low water loss according to claim 1, wherein a water inlet cavity (101) is formed between the end face of the water inlet (3) and the valve seat seal of the water inlet check valve (6), an intermediate cavity (103) is formed between the valve seat seal surface of the water inlet check valve (6) and the valve seat seal of the water outlet check valve (7), and a water outlet cavity (102) is formed between the valve seat seal surface of the water outlet check valve (7) and the end face of the water outlet (4).
9. A backflow preventer with low water loss according to claim 1, characterized in that the drain valve (9) is disposed in the intermediate chamber (103), and a valve seat of the drain valve (9) is disposed below a lowest position in the intermediate chamber (103).
10. A backflow preventer with low water loss according to any one of claims 1 to 9, wherein sealing rings are arranged between the valve top (5) and the valve cover (2), between the valve cover (2) and the valve body (1), and sealing rings are arranged on the contact surfaces of the water inlet check valve (6) and the water outlet check valve (7) with the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121481154.9U CN217130419U (en) | 2021-06-30 | 2021-06-30 | Backflow preventer with low water loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121481154.9U CN217130419U (en) | 2021-06-30 | 2021-06-30 | Backflow preventer with low water loss |
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| Publication Number | Publication Date |
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| CN217130419U true CN217130419U (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121481154.9U Active CN217130419U (en) | 2021-06-30 | 2021-06-30 | Backflow preventer with low water loss |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280162A (en) * | 2021-06-30 | 2021-08-20 | 博纳斯威阀门股份有限公司 | Backflow preventer with low water loss |
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2021
- 2021-06-30 CN CN202121481154.9U patent/CN217130419U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280162A (en) * | 2021-06-30 | 2021-08-20 | 博纳斯威阀门股份有限公司 | Backflow preventer with low water loss |
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