Anti-siphon device of flush valve

Abstract

The utility model provides a flushing valve anti-siphon device which comprises an anti-siphon assembly arranged on a water outlet, the anti-siphon assembly comprises an air valve cover, an air valve body, an air valve core and a sealing membrane, and a movable cavity and an air valve cavity are arranged between the air valve cover and the air valve body; the air valve element is provided with a valve element clamping jaw, a valve element column, a sealing membrane and a valve element lower plate from top to bottom, the valve element column penetrates through a through hole of the partition plate of the air valve body, and the valve element clamping jaw at the upper end of the valve element column extends into the movable cavity and is limited above the partition plate. An air hole communicated with the guide cavity and the air valve cavity is formed in the partition plate; when water flow passes through the anti-siphon device, the air valve core is jacked up by water pressure, so that the air hole is sealed by the sealing membrane; when water discharging is stopped, the air valve element falls down due to self weight to drive the sealing diaphragm to open the air hole, external air reaches the interior of the flushing valve body through the air hole, the vacuum state is damaged, and siphonage is prevented; the structure is convenient to assemble and stable in matching, and has good practical performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely is a kind of flushing valve anti-siphon device. BACKGROUND

[0002] In prior art, vacuum breaking device is arranged at flushing valve water outlet to prevent siphon phenomenon from occurring, prevent sewage from flowing back, referring to the Chinese utility model patent "a new type of flushing valve anti-siphon device" with application No. Figure 1 As shown in the figure;At the same time, the patent improves the anti-siphon device of flushing valve, and the anti-siphon device comprises a valve body, an air inlet valve core and an air inlet valve seat, the air inlet valve core is movable in the valve body, the air inlet valve core is abutted or separated from the air inlet valve seat under the action of water flow, to close or open the air communication port, the air inlet valve core, the rear sealing diaphragm and the rear valve seat are matched to realize the closing or connecting air function, in addition, the vacuum breaking structure has only air flow passage, does not affect water flow passage, the lifting height is very small, the space is small, and the water flow passage is not affected.

[0003] On the basis of the above structure, the applicant further improves the design of flushing valve anti-siphon structure, provides a kind of flushing valve anti-siphon device, so that it is easy to assemble, stable, with good practical performance. CONTENT OF UTILITY MODEL

[0004] The utility model aims at overcoming the shortcomings and deficiencies of prior art, and provides a kind of flushing valve anti-siphon device, and the technical scheme adopted by the utility model is as follows:

[0005] A kind of flushing valve anti-siphon device, the flushing valve includes water inlet and water outlet, anti-siphon assembly is provided on the water outlet, the anti-siphon assembly includes air valve cover, air valve body, air valve core, sealing diaphragm, the air valve cover and air valve body between there is movable cavity and air valve cavity;The air valve core includes valve core clamping jaw, valve core column, valve core lower plate, the valve core column is passed through the through-hole of the partition of air valve body, so that the valve core clamping jaw of valve core column upper end extends into movable cavity and is limited above the partition, the sealing diaphragm is installed on the valve core lower plate of valve core column lower end, and sealing diaphragm and valve core lower plate are limited in the guide cavity below the partition;Air hole is provided on the partition and is communicated with guide cavity and air valve cavity, under the action of fluid, the air valve core drives sealing diaphragm to displace in guide cavity, to close or open the air hole.

[0006] Air inlet channel that is communicated with air valve cavity is provided on the air valve cover or air valve body, or, air inlet gap exists between air valve cover and air valve body, so that air valve cavity is balanced with atmospheric pressure.

[0007] As preferred, a positioning section is arranged between the valve core column and the valve core lower plate, and the sealing diaphragm is sleeved on the outer periphery of the positioning section and clamped between the valve core column and the valve core lower plate; the implementation manner understood by those skilled in the art includes that the diameter of the positioning section is smaller than the diameter of the valve core column and the valve core lower plate, so that an annular clamping groove is formed on the outer periphery of the positioning section, and the sealing diaphragm is positioned in the annular clamping groove.

[0008] As preferred, the valve core lower plate is a plate-shaped structure with a diameter larger than that of the valve core column to support the sealing diaphragm, and the shape and size of the sealing diaphragm correspond to the distribution area of the air holes on the partition plate, so that the sealing diaphragm is sufficient to close all the air holes on the partition plate.

[0009] As preferred, the height of the movable cavity is H (i.e. the maximum lifting stroke of the valve core clamping jaw is H), the maximum sliding stroke of the sealing diaphragm in the guide cavity driven by the air valve core is L, and H≥L; when the water flows through the anti-siphon device and lifts the air valve core, the sealing diaphragm is slid by the valve core until it contacts and blocks the air holes on the partition plate of the air valve body, at this time, the sliding stroke of the air valve core is L, and since H≥L, the valve core clamping jaw at the top of the air valve core can avoid first contacting the top of the air valve cover, and when the water flow stops, the air valve core freely falls until the valve core clamping jaw contacts the partition plate, the air holes are opened, and air can enter the inside of the flush valve body through the air holes from the air valve cavity.

[0010] As preferred, the lower end surface of the valve core clamping jaw is a plane, the upper surface of the partition plate is in plane contact with the lower end surface of the valve core clamping jaw, and the lower end surface of the valve core clamping jaw does not block the air holes; the valve core clamping jaw is in clearance fit with the inner wall of the movable cavity, and the outer peripheral surface of the valve core clamping jaw is a tapered surface.

[0011] As preferred, an isolation cylinder is arranged between the air valve cover and the air valve body, the isolation cylinder is connected with the air valve cover, the inside of the isolation cylinder is a movable cavity, and the outside of the isolation cylinder is an air valve cavity; the outer peripheral surface of one end of the isolation cylinder close to the partition plate has a chamfer, which has the advantage that when the air valve core is lifted and falls, it will not be eccentric too much and will not interfere, and can basically vertically move up and down.

[0012] Finally, an O-shaped sealing ring is arranged between the air valve body and the valve body of the flush valve.

[0013] In the above structure, the water outlet of the flush valve includes a first water outlet and a second water outlet, and the control assembly controls the conduction and blockage between the water inlet and the first water outlet and the second water outlet.

[0014] The utility model discloses beneficial effects as follows: when water flow is by water inlet to water outlet and passes through anti-siphon device, water pressure lifts up air valve core, makes sealed diaphragm close air hole on the partition of air valve body, when stopping water, air valve core falls down due to gravity and drives sealed diaphragm to leave partition to open air hole, makes external gas enter air valve chamber and reaches flush valve body inside through air hole, destroys vacuum state, prevents siphon phenomenon from happening, the above-mentioned structure is convenient to assemble, and cooperation is stable, and has good practicality. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description only is some embodiments of the utility model, and for ordinary skilled person in the art, under the premise of not paying the creative labor, according to these drawings, other drawings still belong to the scope of the utility model.

[0016] Figure 1 It is the cross section structure schematic diagram of example;

[0017] Figure 2 It is Figure 1 It is the enlarged view of A in the middle;

[0018] Figure 3 It is the cross section structure schematic diagram of another angle of example;

[0019] Figure 4 It is the bottom view of example;

[0020] Figure 5 It is the position schematic diagram of air valve core due to gravity and open air hole;

[0021] Figure 6 It is the position schematic diagram of air valve core being lifted up by water flow and closing air hole;

[0022] Figure 7 It is the structure schematic diagram of air valve body;

[0023] Figure 8 It is the explosion view of anti-siphon assembly in the embodiment of example;

[0024] Figure 9 It is the height H of movable cavity and the maximum sliding stroke L of sealed diaphragm in the embodiment of example;

[0025] In the figure, 1-valve body, 11-water inlet, 12a-first water outlet, 12b-second water outlet, 2-control assembly, 3-anti-siphon assembly, 31-gas valve cover, 311-isolation cylinder, 32-gas valve body, 321-isolation plate, 322-through hole, 323-gas hole, 33-gas valve core, 331-valve core clamping jaw, 332-valve core column, 333-positioning section, 334-valve core lower plate, 34-sealing diaphragm, 35-O-ring, 301-moving cavity, 302-gas valve cavity, 303-guide cavity. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the utility model clearer, the utility model will be described further in detail below in combination with embodiments and drawings.

[0027] It should be noted that all the expressions of "first" and "second" in the embodiments of the utility model are used to distinguish two same name non-same entities or non-same parameters, and "first" and "second" are only for the convenience of expression, and should not be understood as the limitation of the embodiments of the utility model, and subsequent embodiments will not be described one by one.

[0028] The direction and position terms mentioned in the utility model, for example, "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side" and the like, are only the direction or position of the drawing. Therefore, the direction and position terms used are used to explain and understand the utility model, and are not limited to the protection scope of the utility model.

[0029] EMBODIMENT

[0030] As Figures 1-3 , 7-8, a flush valve anti-siphon device, the flush valve includes water inlet 11 and water outlet 12, the water outlet 12 is provided with anti-siphon assembly 3, the anti-siphon assembly 3 includes gas valve cover 31, gas valve body 32, gas valve core 33, sealing diaphragm 34, the gas valve cover 31 and gas valve body 32 have moving cavity 301 and gas valve cavity 302 between them;

[0031] The gas valve spool 33 comprises a spool claw 331, a spool column 332, and a spool lower plate 334. The spool column 332 penetrates the through hole 322 of the partition plate 321 of the gas valve body 32, so that the spool claw 331 at the upper end of the spool column 332 extends into the movable cavity 301 and is limited above the partition plate 321. The sealing diaphragm 34 is installed on the spool lower plate 334 at the lower end of the spool column 332, and the sealing diaphragm 34 and the spool lower plate 334 are limited in the guide cavity 303 below the partition plate 321. The partition plate 321 is provided with a gas hole 323 communicating the guide cavity 303 and the gas valve cavity 302. Under the action of fluid, the gas valve spool 33 drives the sealing diaphragm 34 to displace in the guide cavity 303, thereby closing or opening the gas hole 323. Figure 5 When the gas valve spool falls due to gravity and opens the gas hole, the spool claw 331 falls above the partition plate 321 and is limited by the partition plate 321. Figure 6 When the gas valve spool is lifted by water flow and closes the gas hole, the spool claw 331 moves upward in the movable cavity 301, the diaphragm 34 moves upward in the guide cavity 303 and is attached to the lower surface of the partition plate 321, and the gas hole is closed.

[0032] The gas valve cover 31 or the gas valve body 32 is provided with an air inlet channel communicating with the gas valve cavity 302, or there is an air inlet gap between the gas valve cover 31 and the gas valve body 32, so that external gas can enter the gas valve cavity 302.

[0033] A positioning section 333 is arranged between the spool column 332 and the spool lower plate 334. The sealing diaphragm 34 is sleeved on the outer periphery of the positioning section 333 and is clamped between the spool column 332 and the spool lower plate 334. In this embodiment, the diameter of the positioning section 333 is smaller than the diameter of the spool column 332 and the spool lower plate 334, so that an annular clamping groove is formed on the outer periphery of the positioning section 333, and the sealing diaphragm 34 is positioned in the annular clamping groove.

[0034] The spool lower plate 334 is a plate-shaped structure with a diameter larger than that of the spool column 332 to support the sealing diaphragm 34. The shape and size of the sealing diaphragm 34 correspond to the distribution area of the gas holes 323 on the partition plate 321, so that the sealing diaphragm 34 is sufficient to close all the gas holes 323 on the partition plate 321.

[0035] In this embodiment, referring to Figure 2 and Figure 9, the height of the movable cavity 301 is H, the maximum sliding stroke of the sealing diaphragm 34 in the guide cavity 303 driven by the air valve spool 33 is L, and H>L; when the water flows through the anti-siphon device and lifts up the air valve spool, the spool drives the sealing diaphragm to slide until the diaphragm contacts the partition plate of the air valve valve body and blocks the air hole, at this time the sliding stroke of the air valve spool is L, and since H>L, the valve core clamping jaw at the top of the air valve spool can avoid contacting the top of the air valve cover, and when the water flow stops, the air valve spool freely falls until the valve core clamping jaw contacts the partition plate, the air hole is opened, and air can enter the flush valve body through the air hole.

[0036] Further, the lower end surface of the valve core clamping jaw 331 is a plane, the upper surface of the partition plate 321 is in plane contact with the lower end surface of the valve core clamping jaw 331, and the lower end surface of the valve core clamping jaw 331 does not block the air hole 323; the valve core clamping jaw 331 is gap-fitted with the inner wall of the movable cavity 301, the outer peripheral surface of the valve core clamping jaw 331 is a tapered surface, and in this embodiment, the outer peripheral surface of the valve core clamping jaw 331 is rounded and transitions between the outer peripheral surface and the lower end surface thereof.

[0037] In order to separate the movable cavity 301 and the air valve cavity 302, a separation cylinder 311 is arranged between the air valve cover 31 and the air valve body 32, the separation cylinder 311 is connected with the air valve cover 31, the separation cylinder 311 is the movable cavity 301, and the outside of the separation cylinder 311 is the air valve cavity 302; the outer peripheral surface of one end of the separation cylinder 311 close to the partition plate 321 has a chamfer, and the advantage of this design is that when the air valve spool is lifted up and falls down, it will not be eccentric too much and will not interfere, and can basically vertically move up and down.

[0038] Further, the air valve body 32 and the valve body 1 of the flush valve are provided with an O-shaped sealing ring 35.

[0039] Referring to Figure 1 , Figure 4 In this embodiment, the water outlet 12 of the flush valve includes a first water outlet 12a and a second water outlet 12b, and the control assembly 2 controls the conduction and blockage between the water inlet 11 and the first water outlet 12a and the second water outlet 12b; the control assembly 2 includes a coil assembly, water enters from the water inlet of the flush valve, the coil assembly is energized to open, water reaches the anti-siphon device from the water inlet, lifts up the air valve spool and makes the sealing diaphragm close the air hole, and water flows out from the water outlet; when the water inlet is closed at the connection with the coil assembly, the water outlet stops flowing water, the air valve spool falls down due to gravity, air enters the flush valve body from the air valve cavity through the air hole, breaks the vacuum state, and prevents the siphon phenomenon from occurring.

[0040] The above only discloses the preferred embodiment of the utility model, and of course cannot limit the scope of the utility model, therefore, equivalent changes made according to the utility model claims still belong to the scope covered by the utility model.

Claims

1. A siphon-preventing device for a flush valve, said flush valve comprising a water inlet (11) and a water outlet (12), said water outlet (12) being provided with a siphon-preventing assembly (3), characterized in that: The anti-siphon assembly (3) comprises a gas valve cover (31), a gas valve body (32), a gas valve spool (33) and a sealing diaphragm (34), and the gas valve cover (31) and the gas valve body (32) have a movable cavity (301) and a gas valve cavity (302) therebetween; The gas valve spool (33) comprises a spool jaw (331), a spool column (332) and a spool lower plate (334), the spool column (332) penetrates a through hole (322) of a partition plate (321) of the gas valve body (32), the spool jaw (331) at the upper end of the spool column (332) extends into the movable cavity (301) and is limited above the partition plate (321), the sealing diaphragm (34) is installed on the spool lower plate (334) at the lower end of the spool column (332), and the sealing diaphragm (34) and the spool lower plate (334) are limited in a guide cavity (303) below the partition plate (321); The partition plate (321) is provided with a gas hole (323) communicating the guide cavity (303) and the gas valve cavity (302), under the action of fluid, the gas valve spool (33) drives the sealing diaphragm (34) to displace in the guide cavity (303), thereby closing or opening the gas hole (323).

2. A washdown valve anti-siphon apparatus as defined in claim 1, wherein: The gas valve cover (31) or the gas valve body (32) is provided with an air inlet channel communicating with the gas valve cavity (302), or there is an air inlet gap between the gas valve cover (31) and the gas valve body (32).

3. The anti-siphon device of claim 1, wherein: A positioning section (333) is arranged between the spool column (332) and the spool lower plate (334), and the sealing diaphragm (34) is sleeved on the outer periphery of the positioning section (333) and is clamped between the spool column (332) and the spool lower plate (334).

4. The anti-siphon device of claim 1, wherein: The spool lower plate (334) is a plate structure with a diameter larger than that of the spool column (332) to support the sealing diaphragm (34), and the shape and size of the sealing diaphragm (34) correspond to the distribution area of the gas hole (323) on the partition plate (321), so that the sealing diaphragm (34) can close all the gas holes (323) on the partition plate (321).

5. The anti-siphon device of claim 1, wherein: The height of the movable cavity (301) is H, the maximum sliding stroke of the gas valve spool (33) driving the sealing diaphragm (34) in the guide cavity (303) is L, and H≥L.

6. The anti-siphon device of claim 1, wherein: The lower end surface of the spool jaw (331) is a plane, the upper surface of the partition plate (321) is in plane contact with the lower end surface of the spool jaw (331), and the lower end surface of the spool jaw (331) does not block the gas hole (323).

7. The anti-siphon device of claim 1, wherein: The spool jaw (331) is gap-fitted with the inner wall of the movable cavity (301), and the outer peripheral surface of the spool jaw (331) is a tapered surface.

8. The anti-siphon device of claim 1, wherein: The gas valve cover (31) and the gas valve body (32) are provided with a separation cylinder (311), the separation cylinder (311) is the movable cavity (301) inside and the gas valve cavity (302) outside, and the end of the separation cylinder (311) close to the partition plate (321) has a chamfer.

9. The anti-siphon device of claim 1, wherein: An O-shaped sealing ring (35) is arranged between the gas valve body (32) and the valve body (1) of the flush valve.

10. An anti-siphon device for a flush valve according to any one of claims 1-9, characterized in that: The water outlet (12) of the flush valve comprises a first water outlet (12a) and a second water outlet (12b), and the water inlet (11) and the first water outlet (12a) and the second water outlet (12b) are controlled by the control assembly (2) to be conducted or blocked.

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