CN111173957A

CN111173957A - Flushing valve and drip irrigation device

Info

Publication number: CN111173957A
Application number: CN202010133455.6A
Authority: CN
Inventors: 莫彦; 赵新凯; 王建东; 张彦群; 高小艳; 龚时宏; 李巧灵
Original assignee: Beijing Aitefu Water Saving Technology Co ltd; China Institute of Water Resources and Hydropower Research; Institute of Environment and Sustainable Development in Agriculturem of CAAS
Current assignee: Beijing Aitefu Water Saving Technology Co ltd; China Institute of Water Resources and Hydropower Research; Institute of Environment and Sustainable Development in Agriculturem of CAAS
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-05-19

Abstract

The invention provides a flush valve and a drip irrigation device, and relates to the technical field of irrigation equipment. The flushing valve comprises a valve body and an elastic diaphragm, wherein the valve body comprises a valve seat and a valve cover, an accommodating cavity is formed between the valve cover and the valve seat, the elastic diaphragm is arranged in the accommodating cavity and divides the accommodating cavity into a first cavity and a second cavity, and the elastic diaphragm is provided with a communicating channel; the side wall of the first cavity is provided with a water inlet communicated with the capillary and a water outlet used for draining water, the elastic diaphragm can block the water inlet when being pressed and deformed, and the water inlet end of the communicating channel corresponds to the water inlet; the side wall of the second chamber is provided with an exhaust assembly, and the exhaust assembly is used for exhausting gas in the second chamber. The drip irrigation device comprises a capillary, an irrigator and the flushing valve, wherein the irrigator is arranged in the capillary, and the tail end of the capillary is communicated with a water inlet of the flushing valve. The flushing valve can enable the irrigation device to realize automatic flushing for a long time and can be automatically closed, labor force does not need to be consumed, the working efficiency is high, and the flushing effect is good.

Description

Flushing valve and drip irrigation device

Technical Field

The invention relates to the technical field of irrigation equipment, in particular to a flushing valve and a drip irrigation device.

Background

The drip irrigation is a water irrigation method for dripping water and nutrients into soil of a crop root zone in a water drop manner through a drip irrigation system according to the water demand of crops, has the advantages of water saving, fertilizer saving, labor saving and the like, and is one of the most efficient irrigation technologies in the field of irrigation.

During the operation of the drip irrigation system, sediment, organic substances, microorganisms, chemical sediment and other small-particle suspended matters in water can enter the drip irrigation system through the filter to cause the blockage of an emitter of the drip irrigation system, the regular flushing of a capillary tube of the drip irrigation system is one of the most effective methods for controlling the blockage of the emitter, during the flushing, water flow entering the capillary tube is directly discharged from the tail end of the capillary tube, and during the flowing process, the water flow flushes the sediment in the capillary tube and attachments on the inner wall of the capillary tube and directly discharges the sediment from the tail end of the capillary tube.

The common flushing operation of the current drip irrigation system is as follows: an operator manually detaches the plug at the tail end of the capillary or the plastic ball valve to wash for a period of time, and after the washing is finished, the operator manually plugs the plug or closes the ball valve, so that the labor consumption is large and the working efficiency is low.

Disclosure of Invention

The invention aims to provide a flushing valve and a drip irrigation device, which are used for relieving the technical problems of high labor consumption and low working efficiency in the flushing of a drip irrigation system in the prior art.

The embodiment provides a flushing valve, which comprises a valve body and an elastic diaphragm, wherein the valve body comprises a valve seat and a valve cover detachably and fixedly connected to the valve seat, an accommodating cavity is formed between the valve cover and the valve seat, the elastic diaphragm is arranged in the accommodating cavity, the accommodating cavity is divided into a first cavity and a second cavity by the elastic diaphragm, and the elastic diaphragm is provided with a communication channel for communicating the first cavity with the second cavity; a water inlet communicated with a capillary and a water outlet used for draining water are formed in the side wall, corresponding to the first cavity, of the valve body, the elastic diaphragm can block the water inlet when being pressed and deformed, and the water inlet end of the communicating channel corresponds to the water inlet;

and the side wall of the valve body corresponding to the second chamber is provided with an exhaust assembly, and the exhaust assembly is used for exhausting gas in the second chamber.

In an alternative embodiment, the outer wall of the valve cover is provided with a first joint communicated with the second chamber, the exhaust assembly comprises an exhaust cap and a floating body, the exhaust cap is blocked at the first joint, an exhaust cavity is formed between the exhaust cap and the first joint, and an exhaust hole is formed in the top wall of the exhaust cap; the floating body is movably accommodated in the exhaust cavity.

In an optional embodiment, the top of the floating body is provided with a caulking groove, a sealing element is embedded in the caulking groove, and the sealing element corresponds to the exhaust hole;

and/or a conical exhaust nozzle is arranged inwards on the top wall of the exhaust cap, and the exhaust hole penetrates through the exhaust nozzle; the necking end of the exhaust nozzle faces the floating body.

In an optional embodiment, a first clamping groove is formed in the valve seat along the circumferential direction of the valve seat, a first clamping boss is arranged on the edge of the elastic diaphragm along the circumferential direction of the elastic diaphragm, and the first clamping boss is matched with the first clamping groove; a pressing boss is arranged in the valve cover along the circumferential direction of the valve cover, and the pressing boss is abutted to one side of the elastic diaphragm opposite to the first clamping boss in a matched mode;

an installation space is reserved between the pressing boss and the side wall of the valve cover, the side wall of the valve seat is inserted into the installation space, and the valve seat is in threaded connection with the side wall of the valve cover.

In an alternative embodiment, the flush valve further comprises a flow channel seat and a connector fixedly connected to the flow channel seat, the flow channel seat is located in the second chamber, and the connector penetrates through the elastic diaphragm; the communicating channel comprises a water inlet section and a labyrinth-shaped extension section, the water inlet section is arranged in the connector, the extension section is arranged in the runner seat, the water inlet end of the water inlet section is communicated with the first cavity, the water outlet end of the water inlet section is communicated with the water inlet end of the extension section, and the water outlet end of the extension section is communicated with the second cavity.

In an optional embodiment, the flow channel seat comprises a plurality of seat bodies which are spliced, a first splicing wall and a second splicing wall which are used for splicing two adjacent seat bodies form a splicing surface, the extension section extends to one or more splicing surfaces, and the extension section is formed by splicing a first groove body which is arranged on the first splicing wall in the splicing surface and the second splicing wall;

or the extension section is formed by splicing a first groove body of a first splicing wall and a second groove body of a second splicing wall in the splicing surface.

In an optional embodiment, the flow channel seat is a cylinder, the seat bodies are sectors, and the plurality of seat bodies are arranged along the circumferential direction of the flow channel seat; the flushing valve further comprises a cylindrical clamping sleeve, and the clamping sleeve is detachably sleeved on the flow channel seat.

In an optional embodiment, a drain hole is formed in a position, corresponding to the water inlet, of the elastic diaphragm, a turning lip is arranged on a side wall, located on the first chamber, of the elastic diaphragm, a gap exists between the turning lip and the elastic diaphragm, and the turning lip can shield the drain hole.

In an optional implementation manner, a supporting boss is arranged at a position, opposite to the connector, of the inner wall of the valve cover, the supporting boss comprises a plurality of arc-shaped protrusions which are annularly distributed, and a gap is reserved between every two adjacent arc-shaped protrusions.

The embodiment also provides a drip irrigation device, which comprises a capillary, an emitter and the flushing valve, wherein the emitter is arranged on the capillary, and the tail end of the capillary is communicated with the water inlet of the flushing valve.

The flushing valve and the drip irrigation device have the beneficial effects that:

the invention provides a flushing valve and a drip irrigation device, wherein the flushing valve comprises a valve seat and a valve cover which jointly form a valve body, an elastic diaphragm which is used for dividing an accommodating cavity in the valve seat into two chambers, a communication channel which is communicated with the two chambers is arranged on the elastic diaphragm, and an exhaust assembly which is used for exhausting gas in the second chamber; the drip irrigation device comprises a capillary tube for conveying water and an emitter for dripping the water in the capillary tube into soil in a water drop shape.

Initially, the head end of a capillary is communicated with an external water supply device, the tail end of the capillary is communicated with a water inlet of a flush valve, and a first cavity and a second cavity of a valve body are filled with air; when drip irrigation is needed, the external water supply device conveys water into the capillary tube of the drip irrigation device, the inner wall of the capillary tube is washed by water in the capillary tube in the process of flowing through the capillary tube and the water carrying impurities in the capillary tube flows away together, and the water flowing to the tail end of the capillary tube flows into the first cavity through the water inlet and is discharged through the water outlet, so that the drip irrigation device is washed by the water. After water flows into the first cavity, under the action of water pressure, part of water flows into the second cavity through the communicating channel, the exhaust assembly is in an open state at the moment, along with the increase of the water amount in the second cavity, the gas in the second cavity is extruded by the water and is exhausted through the exhaust assembly until the second cavity is full of the water, and the exhaust assembly is closed; because the water in the first cavity is continuously discharged through the water outlet, the internal pressure is lower, meanwhile, the water in the first cavity can continuously supply water to the second cavity, along with the increase of the water amount in the second cavity, the pressure difference between the first cavity and the second cavity is gradually increased, the pressure of the water in the second cavity pressing the elastic diaphragm towards the direction of the first cavity is also gradually increased, the elastic diaphragm is correspondingly deformed towards the direction of the water inlet until the water inlet is blocked, at the moment, the water flow at the tail end of the capillary tube cannot flow into the first cavity and can be communicated with the second cavity through the communication channel, the water pressure is provided for the second cavity, so that the second cavity is in a dynamic balance state, the pressing effect of the water in the second cavity on the elastic diaphragm is ensured, the washing process of the drip irrigation device is finished, and the water in the capillary tube is subjected to drip irrigation on soil through the.

After the drip irrigation is finished, the external water supply device stops supplying water, the water pressure in the capillary pipe is reduced, under the action of pressure difference and self gravity, the water in the second cavity can flow back to the first cavity through the communicating channel, the exhaust assembly is in an opening state at the moment, the external air enters the second cavity along with the reduction of the water amount in the second cavity, the water in the first cavity is discharged through the water outlet, and therefore the irrigation flow of the drip irrigation device is achieved.

At first, use this flushometer to realize that the device of driping irrigation before driping irrigation the automation of certain time washes and self-closing to the labour that significantly reduces consumes, and when above-mentioned flushometer was all installed to the end of a plurality of hollow billet, the flushometer can simultaneous working, thereby improves its work efficiency. In addition, the arrangement of the exhaust assembly enables all power sources for providing deformation pressure for the elastic diaphragm in the second chamber to be water in the second chamber, and when the elastic diaphragm deforms to block the water inlet, the water amount in the second chamber is the sum of the initial volume V1 of the second chamber before the elastic diaphragm deforms and the deformation volume V2 after the elastic diaphragm deforms; compared with the case that the air in the second chamber cannot be exhausted without the exhaust assembly, the air and the water in the second chamber jointly provide deformation pressure of the elastic diaphragm, and when the elastic diaphragm deforms to block the water inlet, the water amount in the second chamber is approximately the deformation volume V2 after the elastic diaphragm deforms (the volume of the air in the second chamber is the initial volume V1 of the second chamber); because the time that the deformation takes place to the water inlet shutoff of elastic diaphragm directly determines the effective time of washing of driping irrigation device, then the time that the second chamber of this application was filled with water is far greater than the time when not setting up exhaust assembly (set up the exhaust assembly and increased the time of filling of approximate volume V1 than not setting up), thereby effectively prolong the time of washing of driping irrigation device, improve its washing effect, reduce the probability that capillary and emitter take place to block up, ensure the normal use of driping irrigation device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an isometric view of a flush valve provided in accordance with an embodiment of the present invention in a first configuration;

FIG. 2 is a top view of a flush valve according to an embodiment of the present invention in a first configuration;

3 FIG. 33 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 in 3 the 3 direction 3 A 3- 3 A 3 of 3 the 3 flush 3 valve 3 of 3 FIG. 32 3 in 3 an 3 inoperative 3 condition 3; 3

FIG. 4 is a partial enlarged view of B in FIG. 3;

3 FIG. 3 5 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 in 3 the 3 direction 3 A 3- 3 A 3 of 3 the 3 flush 3 valve 3 of 3 FIG. 32 3 during 3 an 3 initial 3 flushing 3 sequence 3; 3

FIG. 6 is an enlarged view of a portion C of FIG. 5;

3 FIG. 3 7 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 in 3 the 3 direction 3 A 3- 3 A 3 of 3 the 3 float 3 at 3 a 3 water 3 level 3 in 3 the 3 second 3 chamber 3 after 3 a 3 period 3 of 3 flushing 3 of 3 the 3 flush 3 valve 3 of 3 FIG. 32 3; 3

3 FIG. 3 8 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 in 3 the 3 direction 3 A 3- 3 A 3 of 3 the 3 float 3 blocking 3 the 3 vent 3 hole 3 after 3 the 3 gas 3 has 3 been 3 completely 3 vented 3 during 3 the 3 flush 3 of 3 the 3 flush 3 valve 3 of 3 FIG. 32 3; 3

3 FIG. 3 9 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 in 3 the 3 direction 3 A 3- 3 A 3 of 3 the 3 flush 3 valve 3 of 3 FIG. 32 3 at 3 the 3 end 3 of 3 a 3 flush 3 procedure 3 with 3 the 3 elastic 3 diaphragm 3 blocking 3 the 3 water 3 inlet 3; 3

3 FIG. 310 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 in 3 the 3 direction 3 A 3- 3 A 3 of 3 the 3 flush 3 valve 3 of 3 FIG. 32 3 during 3 a 3 flush 3 event 3; 3

FIG. 11 is an exploded view of a flush valve according to an embodiment of the present invention in a first configuration;

FIG. 12 is a schematic view of the valve seat of FIG. 11;

FIG. 13 is a schematic structural view of the valve cover of FIG. 11;

FIG. 14 is a schematic view from a first perspective of the elastomeric septum of FIG. 11;

FIG. 15 is a schematic illustration of a second perspective view of the elastomeric septum of FIG. 11;

FIG. 16 is a cross-sectional view of the elastomeric septum of FIG. 11;

FIG. 17 is a schematic view of the ferrule of FIG. 11 assembled with the flow passage seat;

FIG. 18 is a schematic view of the vent cap of FIG. 11;

FIG. 19 is a cross-sectional view of a flush valve according to an embodiment of the present invention in a second configuration;

FIG. 20 is an exploded view of a portion of the flush valve of FIG. 19;

fig. 21 is an exploded view of the flow field block of fig. 19.

Icon: 100-an elastic membrane; 110-a first clamping boss; 120-a second card slot; 130-a drain hole; 140-lip everting; 150-connecting hole; 200-valve seat; 210-a water inlet; 220-a water outlet; 230-a first card slot; 240-a second clamping boss; 250-a second linker; 260-reinforcing ribs; 270-a second communication hole; 300-valve cover; 310-a first joint; 320-pressing the boss; 321-a first via hole; 322-installation space; 330-support boss; 331-a curved protrusion; 340-an extension boss; 400-a first chamber; 500-a second chamber; 600-a communication channel; 610-flow channel seat; 611-a first seat body; 612-a second seat; 613-third seat; 614-fourth seat; 620-a connector; 621-cross bayonet joint; 630-water intake section; 640-an extension segment; 641-a first tank; 642-a transverse portion; 643-a vertical portion; 650-cutting ferrule; 660-a support; 700-an exhaust assembly; 710-an exhaust cap; 720-a floating body; 721-caulking groove; 730-an exhaust nozzle; 740-a vent hole; 750-exhaust chamber; 760-sealing member.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The embodiment provides a flush valve, as shown in fig. 3 and fig. 19, which includes a valve body and an elastic diaphragm 100, the valve body includes a valve seat 200 and a valve cap 300 detachably fixed to the valve seat 200, an accommodating cavity is formed between the valve cap 300 and the valve seat 200, the elastic diaphragm 100 is disposed in the accommodating cavity, the elastic diaphragm 100 divides the accommodating cavity into a first chamber 400 and a second chamber 500, and the elastic diaphragm 100 is provided with a communication channel 600 communicating the first chamber 400 and the second chamber 500; the side wall of the valve body corresponding to the first chamber 400 is provided with a water inlet 210 for communicating with the capillary and a water outlet 220 for draining water, the water inlet 210 can be blocked when the elastic diaphragm 100 is pressed and deformed, and the water inlet end of the communicating channel 600 corresponds to the water inlet 210; the side wall of the valve body corresponding to the second chamber 500 is provided with a gas discharge assembly 700, and the gas discharge assembly 700 is used for discharging gas of the second chamber 500.

The embodiment also provides a drip irrigation device, which comprises a capillary, an emitter and the flushing valve, wherein the emitter is arranged in the capillary, and the tail end of the capillary is communicated with the water inlet 210 of the flushing valve.

The flush valve and the drip irrigation device provided by the embodiment, wherein the flush valve comprises a valve seat 200 and a valve cover 300 which jointly form a valve body, an elastic diaphragm 100 which is used for dividing an accommodating cavity inside the valve seat 200 into two chambers, a communication channel 600 which is used for communicating the two chambers is arranged on the elastic diaphragm 100, and an exhaust assembly 700 which is used for exhausting gas in a second chamber 500 is further included; the drip irrigation device comprises a capillary tube for conveying water and an emitter for dripping the water in the capillary tube into soil in a water drop shape.

Initially, the head end of the capillary is communicated with an external water supply device, the tail end of the capillary is communicated with the water inlet 210 of the flush valve, and the first chamber 400 and the second chamber 500 of the valve body are filled with air; when drip irrigation is needed, an external water supply device conveys water into the capillary tube of the drip irrigation device, the inner wall of the capillary tube is washed by water in the capillary tube in the process of flowing through the capillary tube and impurities in the capillary tube flow away together, and the water flowing to the tail end of the capillary tube flows into the first cavity 400 through the water inlet 210 and is discharged through the water outlet 220, so that the drip irrigation device is washed by the water. After water flows into the first chamber 400, under the action of water pressure, part of the water flows into the second chamber 500 through the communicating channel 600, the exhaust assembly 700 is in an open state at the moment, and with the increase of the water amount in the second chamber 500, the gas in the second chamber 500 is extruded by the water and is exhausted through the exhaust assembly 700 until the second chamber 500 is full of water, and the exhaust assembly 700 is closed; since the water in the first chamber 400 is continuously discharged through the water discharge port 220, the pressure therein is small, meanwhile, the water in the first chamber 400 can continuously supply water to the second chamber 500, the pressure difference between the first chamber 400 and the second chamber 500 is gradually increased along with the increase of the water amount in the second chamber 500, the pressure of the water in the second chamber 500 pressing the elastic diaphragm 100 towards the first chamber 400 is also gradually increased, the elastic diaphragm 100 is correspondingly deformed towards the water inlet 210 until the water inlet 210 is blocked, at this time, the water flow at the tail end of the capillary cannot flow into the first chamber 400, and can be communicated with the second chamber 500 through the communicating channel 600, provide water pressure for the second chamber 500 to enable the second chamber 500 to be in a dynamic balance state, ensure the water in the second chamber 500 to press the elastic diaphragm 100, end the flushing process of the drip irrigation device, and drip-irrigate the soil by the water irrigator through the capillary.

After the drip irrigation is finished, the external water supply device stops supplying water, the water pressure in the capillary is reduced, the water in the second chamber 500 can flow back to the first chamber 400 through the communication channel 600 under the action of the pressure difference and the self gravity, and the elastic diaphragm 100 correspondingly returns to the original position; at this time, the air discharge assembly 700 is in an open state, external air enters the second chamber 500 along with the reduction of the water amount in the second chamber 500, and the water in the first chamber 400 is discharged through the water discharge port 220, so that a water filling flow of the drip irrigation device is realized.

At first, use this flushometer to realize that the device of driping irrigation before driping irrigation the automation of certain time washes and self-closing to the labour that significantly reduces consumes, and when above-mentioned flushometer was all installed to the end of a plurality of hollow billet, the flushometer can simultaneous working, thereby improves its work efficiency. In addition, the exhaust assembly 700 is arranged, so that all power sources for providing deformation pressure for the elastic diaphragm 100 in the second chamber 500 are water in the second chamber 500, and when the elastic diaphragm 100 deforms to block the water inlet 210, the water amount in the second chamber 500 is the sum of the initial volume V1 of the second chamber 500 before the elastic diaphragm 100 deforms and the deformation volume V2 after the elastic diaphragm 100 deforms; compared with the case that the air exhausting assembly 700 is not arranged, the air in the second chamber 500 cannot be exhausted, the air and the water in the second chamber 500 jointly provide the deformation pressure of the elastic diaphragm 100, and when the elastic diaphragm 100 deforms to block the water inlet 210, the water amount in the second chamber 500 is approximately the deformation volume V2 after the elastic diaphragm 100 deforms (the volume of the air in the second chamber 500 is the initial volume V1 of the second chamber 500); because the effective flushing time of the drip irrigation device is directly determined by the time for plugging the water inlet 210 by the deformation of the elastic diaphragm 100, the time for filling the second chamber 500 with water is far longer than the time for not arranging the exhaust assembly 700 (the water filling time of the approximate volume V1 is increased compared with the time for not arranging the exhaust assembly 700), so that the flushing time of the drip irrigation device is effectively prolonged, the flushing effect is improved, the probability of blockage of a capillary and an emitter is reduced, and the service life of the drip irrigation device is prolonged. In addition, when the flushing time is equal, the flushing valve has the advantages of smaller volume, smaller occupied space and lower processing cost.

In practical use, when the elastic diaphragm 100 deforms to block the water inlet 210 in consideration of gas compression, the actual water amount V3 in the second chamber 500 is V1+ V2-zxv 1, where Z is a gas compression coefficient, and in an environment at 25 ℃ and 0.1MPa, 0.9992 < Z < 0.9999, that is, V3 ≈ V2, so that the arrangement of the air exhaust assembly enables the flush valve to increase the water filling time of the approximate volume V1, and the drip irrigation device increases the corresponding flush time accordingly.

It should be noted that "water" and "air" are used herein as merely examples of the liquid used for drip irrigation and the gas entering the flush valve, and are not intended to be limiting. Preferably, when the flush valve is used, the air vent assembly 700 may be located at the top position, and the elastic diaphragm 100 is in a nearly horizontal state (the elastic diaphragm 100 may also be in an inclined state, in which case the communication channel 600 may be a through hole or other form disposed on the elastic diaphragm, and the water inlet end thereof may be disposed at a position near the bottom of the elastic diaphragm 100), so as to ensure that the air and water in the second chamber 500 can be completely exhausted, and accordingly, the flush valve can ensure a sufficiently long flush time; as shown in fig. 3 and 19, the water inlet end of the communication channel 600 may be coaxially disposed with the water inlet 210 to ensure the impact water supply of the water flow to the communication channel 600.

Alternatively, in this embodiment, as shown in fig. 3, 12 and 19, the water inlet 210 may be provided to the valve seat 200, and the valve seat 200 is provided with the second joint 250 communicating with the water inlet 210. When the drip irrigation device is used, the tail end of the capillary can be connected with the second connector 250, so that the capillary is communicated with the water inlet 210, and the convenience of connecting the capillary with the valve seat 200 is improved. Preferably, as shown in fig. 19 and 20, when the air discharge assembly 700 is disposed at a side position of the valve cover 300, the second connector 250 may be a straight pipe connector, and when in use, the air discharge assembly 700 is located at the top, and the second connector 250 is connected with a capillary laid on the ground; or as shown in fig. 1-3, when the vent assembly 700 is disposed in the capping position of the valve cap 300, the second connector 250 may be an elbow connector to facilitate the orientation of the flush valve and its connection to the capillary.

Alternatively, as shown in fig. 3, a reinforcing rib 260 may be connected between the valve seat 200 and the second connector 250. The reinforcing rib 260 is provided to enhance the firmness of the connection of the second connector 250 to the valve seat 200 and the supporting strength of the valve seat 200. Specifically, the second connector 250 may be integrally formed with the valve seat 200.

Alternatively, in the present embodiment, as shown in fig. 3 and 19, a first joint 310 communicating with the second chamber 500 may be disposed on an outer wall of the valve cover 300, the vent assembly 700 includes a vent cap 710 and a floating body 720, the vent cap 710 is sealed at the first joint 310, a vent cavity 750 is formed between the vent cap 710 and the first joint 310, and a vent hole 740 is disposed on a top wall of the vent cap 710; the floating body 720 is movably accommodated in the exhaust chamber 750. In this embodiment of the air discharge assembly 700, when the flush valve is not operated, or when the water level in the second chamber 500 does not reach the height of the floating body 720, as shown in fig. 3 and 5, the floating body 720 is located at the bottom of the air discharge chamber 750 under its own weight, and as the amount of water in the second chamber 500 increases, the air in the second chamber 500 is pressed into the air discharge chamber 750 and discharged through the air discharge hole 740; when the water level of the second chamber 500 reaches the height of the floating body 720, as the water level continues to increase, as shown in fig. 7, the floating body 720 floats under the buoyancy of the water and floats upwards along with the increase of the water level, as shown in fig. 8, until the top of the floating body 720 reaches the exhaust hole 740, and the exhaust hole 740 is blocked, and on the basis of exhausting the air in the second chamber 500, the overflow of the water in the second chamber 500 through the exhaust hole 740 is reduced; as the amount of water in the second chamber 500 continues to increase, as shown in fig. 9, the elastic diaphragm 100 is deformed toward the water inlet 210 by the water pressure of the second chamber 500 until the water inlet 210 is sealed, the flushing process is completed, and the drip irrigation device starts to perform drip irrigation water supply.

After the drip irrigation is finished, as shown in fig. 10, the water in the second chamber 500 is discharged to the first chamber 400 through the communication channel 600, and the elastic diaphragm 100 gradually returns to the original position; the floating body 720 floats downwards along with the drop of the water level, the floating body 720 does not block the exhaust hole 740 any more, and the external air can re-enter the second chamber 500 through the exhaust hole 740 along with the drop of the water level in the second chamber 500, thereby completing a water filling process.

Specifically, the floating body 720 may be provided as a hollow cylinder to improve its floatability; the outer diameter of the cylinder is smaller than the inner diameter of the air discharge chamber 750 to ensure that the floating body 720 can smoothly float up and down in the air discharge chamber 750.

Alternatively, in the present embodiment, as shown in fig. 13, an extension boss 340 may be disposed inward at a position of the inner wall of the valve cover 300 corresponding to the first joint 310, and the extension boss 340 is annular and surrounds the first joint 310; the inner end of the extension boss 340 is provided with an inner flange. The arrangement of the extension boss 340 can increase the volume of the exhaust cavity 750, ensure that the floating body 720 can float in the exhaust cavity 750 and cannot block the exhaust cavity 750; in addition, the inward flange of the extension boss 340 can limit the position of the floating body 720, so as to reduce or even avoid the floating body 720 from falling down from the exhaust cavity 750, thereby ensuring the normal use of the exhaust assembly 700.

Besides the above forms, the exhaust assembly 700 may be in other forms, such as a solenoid valve structure, and an operator may set the on-off time of the solenoid valve according to the flushing time of the flushing valve and the drip irrigation time of the drip irrigation device, so as to realize the automatic operation of the exhaust assembly 700.

Alternatively, in this embodiment, as shown in fig. 11 and 20, a caulking groove 721 may be provided on the top of the floating body 720, a sealing member 760 is embedded in the caulking groove 721, and the sealing member 760 corresponds to the exhaust hole 740. When the floating body 720 floats upwards under the buoyancy of the water in the second chamber 500, the sealing element 760 is matched with the exhaust hole 740, and the deformation performance of the sealing element 760 is greater than that of the floating body 720, so that the sealing performance of the sealing element on the exhaust hole 740 is improved, and the overflow of the water in the second chamber 500 is further reduced; specifically, the sealing member 760 may be a rubber member or a silicone member. Preferably, when the exhaust cavity is approximately cylindrical, the floating body may be cylindrical or spherical to ensure the smoothness of the floating body floating up and down in the exhaust cavity.

In this embodiment, as shown in fig. 3 and 18, a tapered exhaust nozzle 730 may be provided inward on the top wall of the exhaust cap 710, and the exhaust hole 740 penetrates the exhaust nozzle 730; the constricted end of the exhaust nozzle 730 faces the floating body 720. The inside arch that forms of exhaust nozzle 730, floating body 720 upwards floats and the exhaust nozzle 730 butt of back taper, and area of contact is less, and floating body 720 is bigger to the shutoff pressure of exhaust hole 740, and the shutoff leakproofness is better.

Alternatively, in this embodiment, as shown in fig. 3 and fig. 19, a first clamping groove 230 may be disposed in the valve seat 200 along the circumferential direction thereof, and a first clamping boss 110 is disposed at the edge of the elastic diaphragm 100 along the circumferential direction thereof, where the first clamping boss 110 is matched with the first clamping groove 230; a pressing boss 320 is arranged in the valve cover 300 along the circumferential direction of the valve cover, and the pressing boss 320 is matched and abutted against one side of the elastic diaphragm 100 opposite to the first clamping boss 110; an installation space 322 is left between the pressing boss 320 and the sidewall of the valve cover 300, the sidewall of the valve seat 200 is inserted into the installation space 322, and the valve seat 200 is in threaded connection with the sidewall of the valve cover 300. Here, the valve seat 200 is detachably connected with the valve cover 300, and the elastic diaphragm 100 is installed in a specific form in the accommodating cavity, when the elastic diaphragm 100 is installed, the first clamping boss 110 of the elastic diaphragm 100 is matched and clamped in the first clamping groove 230 of the valve seat 200, so that the initial positioning of the elastic diaphragm 100 is realized; subsequently, the side wall of the valve seat 200 is screwed with the valve cover 300, the pressing boss 320 is displaced towards the valve seat 200 in the connection process, the elastic diaphragm 100 is pressed finally, and the elastic diaphragm 100 is clamped between the first clamping groove 230 and the pressing boss 320, so that the installation firmness of the elastic diaphragm 100 is ensured, and the falling-off condition of the elastic diaphragm 100 in the stress deformation process is reduced.

In addition, the arrangement of the first engaging groove 230 and the first engaging protrusion 110 can increase the connecting area between the elastic diaphragm 100 and the valve seat 200, so as to improve the sealing performance of the connection between the elastic diaphragm 100 and the valve seat 200, and accordingly ensure the relative independence between the first chamber 400 and the second chamber 500 partitioned by the elastic diaphragm 100.

Specifically, as shown in fig. 19, when the vent assembly 700 is located at the sidewall of the valve cover 300, in order to achieve communication between the second chamber 500 and the first connector 310, a first communication hole 321 may be provided at a position where the sidewall of the pressing boss 320 corresponds to the first connector 310, and accordingly, a second communication hole 270 may be provided at a position where the valve seat 200 corresponds to the first connector 310; preferably, the first communication hole 321, the second communication hole 270 and the inner hole of the first connector 310 have approximately the same diameter, and the three holes may be coaxially disposed.

Alternatively, in this embodiment, as shown in fig. 3 and 19, the inner sidewall of the first clamping groove 230 may form a second clamping boss 240, the elastic diaphragm 100 is provided with a second clamping groove 120, and the second clamping groove 120 matches with the second clamping boss 240. When the elastic diaphragm 100 is inserted into the valve seat 200, the first engaging protrusion 110 is inserted into the first engaging groove 230 of the valve seat 200, and the second engaging protrusion 240 of the valve seat 200 is inserted into the second engaging groove 120 of the elastic diaphragm 100, so that the connection area and the connection flexibility of the elastic diaphragm 100 and the valve seat 200 are greatly improved, and the connection stability and the connection tightness of the elastic diaphragm 100 and the valve seat 200 are further improved.

In this embodiment, as shown in fig. 3 and 19, the flush valve may further include a flow channel seat 610 and a connector 620 fixedly connected to the flow channel seat 610, the flow channel seat 610 is located in the second chamber 500, and the connector 620 penetrates through the elastic diaphragm 100; the communicating channel 600 comprises a water inlet section 630 and a labyrinth-shaped extension section 640, the water inlet section 630 is arranged in the connector 620, the extension section 640 is arranged in the runner seat 610, the water inlet end of the water inlet section 630 is communicated with the first chamber 400, the water outlet end of the water inlet section 630 is communicated with the water inlet end of the extension section 640, and the water outlet end of the extension section 640 is communicated with the second chamber 500. In this embodiment, the communication channel 600 is a specific form, during the flushing process, the water in the first chamber 400 flows into the water inlet section 630 and then flows into the extension section 640 in a labyrinth shape, because the extension section 640 has a high flexibility, the water flows through the extension section 640, the extension section 640 continuously dissipates energy to reduce the water flow speed, and the length of the flow path of the extension section 640 is long, so that it takes a long time for the water in the first chamber 400 to flow into the second chamber 500 through the extension section 640; then the first chamber 400 continuously fills water into the second chamber 500 until the air in the second chamber 500 is completely exhausted, the floating body blocks the air outlet, the elastic diaphragm 100 deforms to block the water inlet 210, and the flushing process is finished. The arrangement of the flow channel seat 610 and the inner labyrinth-shaped extension segment 640 thereof can effectively prolong the time for the water in the first chamber 400 to flow into the second chamber 500, thereby further prolonging the washing time of the drip irrigation device and correspondingly improving the washing effect of the washing valve.

Specifically, the extension segment 640 may be a three-dimensional flow channel that is distributed in a forward direction and a reverse direction in a penetrating manner along multiple directions, so as to fully utilize the space in the flow channel seat 610, and reduce the space occupied by the flow channel seat 610 for the second chamber 500.

Specifically, in this embodiment, as shown in fig. 17, the clamping plates arranged radially may be disposed at the outer end of the connector 620, and during connection, the clamping plates are forced to pass through the deformed and expanded connection hole 150 on the elastic diaphragm 100, and then the connection hole 150 is restored to a shape that is tightly sleeved on the connector 620 at a position between the clamping plates and the flow channel seat 610, so as to detachably and fixedly connect the flow channel seat 610 and the elastic diaphragm; specifically, the cardboard can be four, and four cardboards are evenly arranged along the circumference of connector 620 at interval and are formed cross joint 621.

Optionally, in this embodiment, as shown in fig. 21, the runner seat 610 may include a plurality of seat bodies that are spliced, a splicing surface is formed by a first splicing wall and a second splicing wall that are used for splicing two adjacent seat bodies, the extension section 640 extends to one or more splicing surfaces, and the extension section 640 is formed by splicing a first groove 641 that is provided in the splicing surface and the second splicing wall. Compared with the prior art, the flow channel seat 610 is directly provided with the zigzag extension section 640 inside the flow channel seat 610 of the independent individual body, the flow channel seat 610 is formed by splicing a plurality of seat bodies, and the first groove body 641 forming the extension section 640 is arranged on the first splicing wall of the splicing surface of the seat bodies, on one hand, during processing, the first groove body 641 can be arranged on the first splicing wall of the seat bodies, then the seat bodies are spliced to form the flow channel seat 610 with the labyrinth extension section 640 inside, the processing convenience is greatly improved, and the corresponding processing cost is greatly reduced; on the other hand, when extension segment 640 is blockked up, can unpack runner seat 610 apart, directly to expose first cell body 641 cleaning process can, it is higher to maintain the maintenance convenience to improve runner seat 610's the convenient degree of use. Specifically, the extension section may be entirely disposed on one of the splicing surfaces, or may be formed by channel sections disposed on different splicing surfaces.

In addition to the above form, the extension segment 640 may also be formed by splicing a first groove 641 formed on the first splicing wall and a second groove formed on the second splicing wall.

Alternatively, in this embodiment, as shown in fig. 17, the flow channel seat 610 may be a cylinder, the seat bodies are sectors, and the plurality of seat bodies are arranged along the circumferential direction of the flow channel seat 610; the flush valve may further include a cylindrical sleeve 650, and the sleeve 650 is detachably mounted on the flow channel seat 610. Here, the flow channel seat 610 is a specific form, the flow channel seat 610 is spliced to form a cylinder, the cylinder is inserted into a cylindrical sleeve 650, and the sleeve 650 limits the circumferential positions of the plurality of seat bodies to improve the integrity and structural stability of the flow channel seat 610; specifically, an external thread may be disposed on an outer side wall of the flow channel seat 610, an internal thread may be disposed on an inner side wall of the ferrule 650, and the flow channel seat 610 is in threaded connection with the ferrule 650. Specifically, as shown in fig. 21, the runner base 610 is formed by splicing four fan-shaped base bodies, the four base bodies are a first base body 611, a second base body 612, a third base body 613 and a fourth base body 614, respectively, and the connector 620 is disposed at an end of the fourth base body 614.

Specifically, as shown in fig. 21, the horizontal portion 642 and the vertical portion 643 which are protruded crosswise can be arranged on the splicing wall of the seat body, and the horizontal portion 642 and the vertical portion 643 which are used as the side portions of the groove body separate the groove body into a zigzag flow channel, so that the energy dissipation effect on the water flow is effectively achieved.

In this embodiment, as shown in fig. 3 to 10 and fig. 14 to 16, a drain hole 130 may be disposed at a position of the elastic diaphragm 100 corresponding to the water inlet 210, a flip lip 140 is disposed on a side wall of the first chamber 400 of the elastic diaphragm 100, a gap exists between the flip lip 140 and the elastic diaphragm 100, and the flip lip 140 can block the drain hole 130. When the flushing valve is not operated, as shown in figures 3 and 4, the turning lip and the elastic diaphragm are kept in the original state; after the drip irrigation device is started, water flow in the capillary tube flows into the first chamber 400 through the water inlet 210 at a certain flow rate, impact and press the turning lip 140 facing the water inlet 210, as shown in fig. 5 and 6, the turning lip 140 is inwardly deformed to be attached to the elastic diaphragm 100 and block the water discharge hole 130, and water in the first chamber 400 flows into the second chamber 500 through the communication channel 600; the air in the second chamber is exhausted through the exhaust hole, when the water level in the second chamber is lower than the floating body, as shown in fig. 3 and 5, the floating body is positioned at the bottom of the exhaust chamber, and when the water level in the second chamber is higher than the floating body, as shown in fig. 7, the floating body floats upwards along with the water level in the second chamber, as shown in fig. 8, until the floating body blocks the exhaust hole, the exhaust process is finished; the first chamber continues to supply water to the second chamber, as shown in fig. 9, the water pressure in the second chamber presses the elastic diaphragm to deform and block the water inlet, and the flushing process is finished.

After the flushing process is finished, in the drip irrigation water supply process, as shown in fig. 9, the water pressure in the capillary can continuously impact the turning lip 140 to seal the water discharge hole 130, and accordingly, the water pressure in the second chamber 500 continuously compresses the elastic diaphragm 100 to seal the water inlet 210, so as to ensure the normal operation of the drip irrigation process; after the drip irrigation is finished, the water pressure in the capillary is reduced, as shown in fig. 10, the turning lip 140 returns to the original position under the action of the self deformation restoring force, the water drain hole 130 is not blocked any more, the water in the second chamber 500 can be quickly and thoroughly discharged to the first chamber 400 through the water drain hole 130 and finally discharged through the water drain hole 220, the floating body descends to the original position along with the water level, the external air enters the second chamber through the air drain hole, the flushing time of the flushing valve in the next use is ensured, the height limitation of the water outlet end of the extension section 640 in the channel seat 610 is reduced, the water in the second chamber 500 cannot be completely discharged through the communication channel 600, and the flushing time condition of the flushing valve in the next use is further influenced. In addition, the tiny particles (silt, etc.) entering the second chamber 500 through the channel seat 610 can also flow out from the drain hole 130 along with the water flow, thereby reducing the influence on the normal use of the flush valve caused by the silt accumulated in the second chamber 500 after the flush valve is used for many times.

Preferably, as shown in FIG. 3, the flush valve is used to ensure that the elastomeric diaphragm 100 is positioned approximately horizontally, with the vent assembly 700 located at the top of the flush valve; further, the following may be provided: in use of the flush valve, vent assembly 700 is positioned at the top of the flush valve, flexible diaphragm 100 is tilted or oriented vertically, and drain hole 130 is positioned in the bottom region of flexible diaphragm 100.

In this embodiment, as shown in fig. 3, a support 660 may be disposed between the end surface of the flow channel seat 610 facing the elastic diaphragm 100 and the elastic diaphragm 100 to ensure that the flow channel seat 610 does not block the water discharge hole 130 on the elastic diaphragm 100, and accordingly, to ensure the water in the second chamber 500 to be discharged.

Specifically, in this embodiment, as shown in fig. 15, the water inlet end of the communication channel 600 is coaxial with the water inlet 210, the plurality of water discharge holes 130 are provided, and the plurality of water discharge holes 130 are arranged at intervals along the circumferential direction of the water inlet end of the communication channel 600; as shown in fig. 16, the turning lip 140 is annular, and the turning lip 140 surrounds the water inlet end of the communication channel 600. The plurality of water discharge holes 130 can be simultaneously blocked by the annular flip lip 140 under the action of water pressure, the plurality of water discharge holes 130 facilitate the complete discharge of water in the second chamber 500, and when a single water discharge hole 130 is blocked, other water discharge holes 130 can still discharge water.

In this embodiment, as shown in fig. 19 and 20, a supporting boss 330 may be disposed on an inner wall of the valve cover 300 opposite to the connection head 620, the supporting boss 330 includes a plurality of arc-shaped protrusions 331, the plurality of arc-shaped protrusions 331 are annularly distributed, and a gap is left between adjacent arc-shaped protrusions 331. Aiming at the end face of the extension segment 640, which is located at the end face of the flow channel seat 610 away from the elastic diaphragm 100, when the drip irrigation device starts to work, the elastic diaphragm 100 is deformed in the direction towards the second chamber 500 by the impact of water flow in the capillary, and accordingly, the flow channel seat 610 moves towards the valve cover 300 along with the elastic diaphragm 100 until the flow channel seat 610 abuts against the support boss 330, the support boss 330 can ensure that a gap exists between the end face of the flow channel seat 610, which is provided with the water outlet end, and the valve cover 300, and water flowing out of the water outlet end (the support boss 330 is different from the water outlet end or the support boss 330 does not completely block the water outlet end) can flow into the second chamber 500 through the gap between the arc-shaped protrusions 331, so that the situation that the elastic diaphragm 100 is pressed by water in the capillary to move the flow channel seat 610, and the water outlet end on the flow channel seat 610 is blocked by the valve cover 300.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flushing valve is characterized by comprising a valve body and an elastic diaphragm (100), wherein the valve body comprises a valve seat (200) and a valve cover (300) detachably and fixedly connected to the valve seat (200), an accommodating cavity is formed between the valve cover (300) and the valve seat (200), the elastic diaphragm (100) is arranged in the accommodating cavity, the accommodating cavity is divided into a first cavity (400) and a second cavity (500) by the elastic diaphragm (100), and the elastic diaphragm (100) is provided with a communication channel (600) for communicating the first cavity (400) with the second cavity (500); the side wall of the valve body corresponding to the first cavity (400) is provided with a water inlet (210) communicated with a capillary and a water outlet (220) used for draining water, the elastic diaphragm (100) can block the water inlet (210) when being deformed under pressure, and the water inlet end of the communicating channel (600) corresponds to the water inlet (210);

the side wall of the valve body corresponding to the second chamber (500) is provided with a gas exhaust assembly (700), and the gas exhaust assembly (700) is used for exhausting gas of the second chamber (500).

2. The flush valve according to claim 1, wherein the outer wall of the valve cover (300) is provided with a first joint (310) communicated with the second chamber (500), the exhaust assembly (700) comprises an exhaust cap (710) and a floating body (720), the exhaust cap (710) is sealed at the first joint (310), an exhaust cavity (750) is formed between the exhaust cap (710) and the first joint (310), and the top wall of the exhaust cap (710) is provided with an exhaust hole (740); the floating body (720) is movably accommodated in the exhaust cavity (750).

3. The flush valve according to claim 2, wherein the floating body (720) is provided at the top with a caulking groove (721), the caulking groove (721) is embedded with a sealing member (760), the sealing member (760) corresponds to the exhaust hole (740);

and/or a conical exhaust nozzle (730) is arranged on the top wall of the exhaust cap (710) inwards, and the exhaust hole (740) penetrates through the exhaust nozzle (730); the necking end of the exhaust nozzle (730) faces the floating body (720).

4. The flush valve according to claim 1, wherein a first clamping groove (230) is formed in the valve seat (200) along the circumferential direction thereof, a first clamping boss (110) is formed on the edge of the elastic diaphragm (100) along the circumferential direction thereof, and the first clamping boss (110) is matched with the first clamping groove (230); a pressing boss (320) is arranged in the valve cover (300) along the circumferential direction of the valve cover, and the pressing boss (320) is abutted to one side of the elastic diaphragm (100) opposite to the first clamping boss (110) in a matching manner;

an installation space (322) is reserved between the pressing boss (320) and the side wall of the valve cover (300), the side wall of the valve seat (200) is inserted into the installation space (322), and the valve seat (200) is in threaded connection with the side wall of the valve cover (300).

5. A flush valve according to any of claims 1 to 4, further comprising a flow channel seat (610) and a connector (620) secured to said flow channel seat (610), said flow channel seat (610) being located within said second chamber (500), said connector (620) passing through said elastic diaphragm (100); the extension section (640) of intercommunication passageway (600) including the section of intaking (630) and maze form, it locates to intake section (630) in connector (620), extension section (640) are located in runner seat (610), the end of intaking of the section of intaking (630) with first cavity (400) intercommunication, the play water end of the section of intaking (630) with the end intercommunication of intaking of extension section (640), the play water end of extension section (640) with second cavity (500) intercommunication.

6. The flush valve according to claim 5, wherein the flow channel seat (610) comprises a plurality of seat bodies which are spliced, a first splicing wall and a second splicing wall which are used for splicing adjacent two seat bodies form a splicing surface, the extension section (640) extends to one or more splicing surfaces, and the extension section (640) is formed by splicing a first groove (641) which is arranged on the first splicing wall and the second splicing wall in the splicing surfaces;

or the extension section (640) is formed by splicing a first groove body (641) of a first splicing wall and a second groove body of a second splicing wall in the splicing surface.

7. The flush valve of claim 6, wherein said flow channel seat (610) is a cylinder, said seat bodies are segments, and a plurality of said seat bodies are arranged along a circumferential direction of said flow channel seat (610); the flushing valve further comprises a cylindrical clamping sleeve (650), and the clamping sleeve (650) is detachably sleeved on the flow channel seat (610).

8. The flush valve according to claim 5, wherein a drain hole (130) is formed at a position of the elastic diaphragm (100) corresponding to the water inlet (210), a flip lip (140) is formed on a side wall of the elastic diaphragm (100) located in the first chamber (400), a gap exists between the flip lip (140) and the elastic diaphragm (100), and the flip lip (140) can block the drain hole (130).

9. The flush valve according to claim 5, wherein a supporting boss (330) is disposed at a position opposite to the connecting head (620) on the inner wall of the valve cover (300), the supporting boss (330) comprises a plurality of arc-shaped protrusions (331), the plurality of arc-shaped protrusions (331) are annularly distributed, and a gap is reserved between adjacent arc-shaped protrusions (331).

10. A drip irrigation device, comprising a capillary, an emitter and a flush valve according to any one of claims 1 to 9, wherein the emitter is arranged in the capillary, and the end of the capillary is communicated with a water inlet (210) of the flush valve.