CN216156722U - Backflow-preventing opening structure opened by water pressure - Google Patents

Abstract

The utility model relates to a backflow-preventing opening structure opened by water pressure, which comprises a delay pipe and a delay piston arranged in the delay pipe, wherein the delay pipe is also internally provided with an opening piston linked with the delay piston and a backflow-preventing device; when water pushes the delay piston to drive the opening piston to move, the water is discharged from the water outlet and pushes the backflow prevention device to move, and the water is discharged after passing through the backflow prevention device; when water flows backwards, the backflow preventing device is pressed against the other end of the water outlet by the water to prevent the water from flowing backwards; be provided with and open the piston and prevent the refluence device, dual prevent the refluence setting, design benefit, prevent that refluence is effectual, easily control prevents that our drinking water from receiving the pollution, protects our health, and user uses and experiences well.

Description

Backflow-preventing opening structure opened by water pressure

[ technical field ] A method for producing a semiconductor device

The utility model relates to the field of toilets, in particular to a backflow preventing opening structure opened by water pressure.

[ background of the utility model ]

Among the prior art, when appearing cutting off water or the closestool breaks down, the water in the closestool water tank can flow back to the water pipe in, because placed the sanitizer usually in the closestool water tank, the refluence can lead to our drinking water to receive the pollution, endangers our health.

For this reason, the utility model discloses a prevent environment-friendly device of toilet tank sewage refluence is disclosed for CN205062951U utility model, including support component and anti-backflow part, anti-backflow part passes through support component and installs in the water tank water pipe, anti-backflow part is ball or spring, when anti-backflow part is the ball, support component is the epirelief support frame, the below at the epirelief support frame is installed to the ball, when anti-backflow part is the spring, support component includes recessed support frame and band-pass hole support, the spring mounting is between recessed support frame and band-pass hole support, the rubber layer is installed at the top of spring, the ball is stainless steel ball or glass ball. The utility model has simple structure and convenient use, and when the water tank is placed in the water inlet pipe of the water tank, the sewage in the water tank can not flow back to the water pipe to cause the pollution of the water in the water pipe when the water is cut off.

The above patent has the following problems: above-mentioned patent prevents the refluence through ball or spring, and when the rivers of refluence water are less, under the buoyancy of water, the ball floats, and the passageway is opened, and water still can flow backwards, and it is poor to prevent the refluence effect, and is wayward, leads to our drinking water to receive the pollution, endangers our health.

The prior art does not meet our needs.

[ Utility model ] content

In order to solve the problems, the utility model provides a backflow opening preventing structure with good control effect for water pressure opening.

In order to achieve the purpose, the utility model provides the following technical scheme: a backflow opening prevention structure opened by water pressure comprises a delay tube and a delay piston arranged in the delay tube, wherein an opening piston and a backflow prevention device which are linked with the delay piston are further arranged in the delay tube, one end of the opening piston abuts against one end of a water outlet, a pressure relief cavity communicated with the water outlet is further formed in one side of the delay tube, and the backflow prevention device is arranged in the pressure relief cavity; when water pushes the delay piston to drive the opening piston to move, the water is discharged from the water outlet and pushes the backflow prevention device to move, and the water is discharged after passing through the backflow prevention device; when water flows backwards, the backflow preventing device is propped against the other end of the water outlet by the water, so that the water is prevented from flowing backwards.

As a preferred embodiment, further defined is: the backflow prevention device comprises a first pressure relief plug, a second pressure relief plug inserted into the first pressure relief plug and a return spring with one end abutting against the first pressure relief plug, the first pressure relief plug is provided with an insertion hole, and the second pressure relief plug is provided with an insertion part which is inserted into the insertion hole after being assembled and is partially exposed; the time delay pipe is characterized in that a mounting cavity is arranged in the time delay pipe, a raised pressure relief portion is arranged on the outer peripheral surface of the time delay pipe, the pressure relief cavity is arranged in the pressure relief portion and communicated with the mounting cavity through the water outlet, a flow relief port communicated with the pressure relief cavity is formed in the pressure relief portion, an opening is formed in one end, far away from the time delay pipe, of the pressure relief portion, and a connector covering the opening is further sleeved on the pressure relief portion.

As a preferred embodiment, further defined is: the first pressure relief plug comprises a pressure relief plug body and a fixing part integrally formed with the pressure relief plug body, the reset spring is sleeved outside the pressure relief plug body, one end of the reset spring is abutted to the fixing part, the other end of the reset spring is abutted to the joint, and the diameter of the fixing part is smaller than or equal to that of the pressure relief cavity and larger than that of the water outlet.

As a preferred embodiment, further defined is: the fixed part is provided with an opening towards the chamber that holds of keeping away from pressure relief plug main part one end, the jack with hold the chamber and communicate with each other, the second pressure relief plug is provided with the assembly back and supports and hold the first sealing portion on the chamber bottom wall, be provided with a plurality of drainage channel that supply water flows on the portion of inserting.

As a preferred embodiment, further defined is: the utility model discloses a pressure relief portion's piston, including time delay pipe, pressure relief portion, piston, linkage hole, time delay pipe, still be provided with bellied installation department on keeping away from the outer peripheral face of pressure relief portion, be provided with in the installation department with the relative activity chamber in pressure relief chamber, open the piston including supporting second sealing on the delivery port, the activity sets up after the assembly activity in the activity intracavity activity portion of inserting and linkage hole, the linkage hole is seted up and is established just be located between second sealing and the activity portion of inserting and be close to one side of second sealing, the cover is equipped with the packing ring in the second sealing.

As a preferred embodiment, further defined is: be provided with the sealing washer in the activity insertion portion, the cover is equipped with the installation lid on the installation department, the activity intracavity still is provided with auxiliary spring, auxiliary spring one end is supported on the activity insertion portion, the auxiliary spring other end supports the installation is covered, the time delay piston includes down the time delay piston, sets up through the bolt fastening last time delay piston and the piston spring of setting in last time delay piston upper end on the time delay piston of downwardly extending, the time delay piston is provided with to insert after the assembly and establishes down the first inserted bar in linkage hole and is used for promoting open the promotion portion of piston.

As a preferred embodiment, further defined is: the upper end of the delay tube is also provided with a time adjusting device, the time adjusting device comprises a delay adjusting cover covering the opening and a time adjusting knob arranged on the delay adjusting cover, the delay adjusting cover is provided with a plurality of exhaust holes with different diameters, and the time adjusting knob is provided with a through hole; the diameter of the through hole is larger than that of any exhaust hole.

As a preferred embodiment, further defined is: the time delay device comprises a time delay pipe, a time delay piston, a time delay adjusting cover and a time delay adjusting cover, wherein an installation cavity is arranged in the time delay pipe, an opening communicated with the installation cavity is formed in the upper end of the time delay pipe, a first water inlet hole communicated with the installation cavity is further formed in the lower end of the time delay pipe, the time delay piston is arranged in the installation cavity so that the installation cavity is divided into an upper installation cavity located at the upper end of the time delay piston and a lower installation cavity located at the lower end of the time delay piston, a first accommodating cavity into which the time delay pipe is inserted is formed in the time delay adjusting cover, and an exhaust hole is communicated with the first accommodating cavity; when water enters the lower mounting cavity from the first water inlet hole, the water pushes the delay piston to move upwards, so that gas in the upper mounting cavity is discharged through the through hole and the exhaust hole.

As a preferred embodiment, further defined is: the time adjusting knob is provided with a time delay adjusting baffle, the through hole is formed in the time delay adjusting baffle, the time delay adjusting cover is further provided with a first mounting hole communicated with the first accommodating cavity, the time delay adjusting baffle is further provided with a first inserting portion inserted into the first mounting hole after being assembled, the first inserting portion of the time delay adjusting baffle penetrates through the first mounting hole of the time delay adjusting cover and then is connected with the time adjusting knob through a second inserting rod, a second mounting hole is further formed in the first inserting portion, and the time adjusting knob is provided with a second inserting portion inserted into the second mounting hole after being assembled; the bottom wall of the second mounting hole is provided with a first inserting hole, a second inserting hole is formed in the second inserting portion, the second inserting rod is inserted into the second inserting hole and the first inserting hole, an inserting key is further arranged on the inner wall of the second mounting hole, and an inserting groove matched with the inserting key in the direction is formed in the periphery of the second inserting portion.

As a preferred embodiment, further defined is: still be provided with the locator in the time adjusting device, the locator is including setting up the second on the time delay adjusting cover holds the chamber, sets up the marble that the intracavity is held to the second still is provided with a plurality of along the locating hole of axial distribution on the time adjusting knob, the locator still includes first spring, first spring be used for with marble jack-up makes its part insert in the locating hole, still be provided with between time delay adjusting cover and the time adjusting knob with the second spring of time adjusting knob jack-up.

The utility model has the beneficial effects that: the utility model not only utilizes water pressure control to open and drain water, but also is provided with a backflow prevention device, when water pushes the delay piston to move along the axial direction, the delay piston drives the opening piston to move transversely, so that water enters the pressure relief cavity through the water outlet, then the water pushes the first pressure relief plug and the second pressure relief plug to move, when the first pressure relief plug and the second pressure relief plug are abutted against the joint, the first pressure relief plug and the second pressure relief plug are staggered, and the water passes through the jack and the drainage channel and then is discharged through the joint; after intaking, reset spring promotes first pressure relief and fills in with second pressure relief and time delay piston resets, and the one end of opening piston 3 supports again at the delivery port, is provided with and opens the piston and prevent the refluence device, and dual prevent the refluence setting, prevent water refluence, design benefit prevents that our drinking water from receiving the pollution, protects our health, and user experience is good.

[ description of the drawings ]

FIG. 1 is one of the schematic structural diagrams of the present invention;

FIG. 2 is a second schematic structural diagram of the present invention;

FIG. 3 is an exploded view of the present invention;

FIG. 4 is a transverse cross-sectional view of the present invention in an initial state;

FIG. 5 is an enlarged schematic view of A in FIG. 4;

FIG. 6 is an enlarged schematic view of B in FIG. 4;

FIG. 7 is a transverse cross-sectional view of the present invention in a drainage condition;

FIG. 8 is an enlarged schematic view of C of FIG. 7;

FIG. 9 is an exploded view of the time adjustment device;

fig. 10 is a schematic view of the structure of the opening piston.

[ detailed description ] embodiments

The utility model is described in further detail below with reference to the following figures and detailed description:

as shown in fig. 1 to 10, a backflow opening prevention structure for hydraulic pressure opening includes a delay tube 1 and a delay piston 2 disposed in the delay tube 1, an opening piston 3 and a backflow prevention device 4 linked with the delay piston 2 are further disposed in the delay tube 1, one end of the opening piston 3 abuts against one end of a water outlet 11, a pressure relief cavity 12 communicated with the water outlet 11 is further disposed on one side of the delay tube 1, and the backflow prevention device 4 is disposed in the pressure relief cavity 12; when water pushes the delay piston 2 to drive the opening piston 3 to move, the water is discharged from the water outlet 11 and pushes the backflow prevention device 4 to move, and the water is discharged after passing through the backflow prevention device 4; when water flows backwards, the backflow preventing device 4 is propped against the other end of the water outlet 11 by the water to prevent the water from flowing backwards; the water pressure is utilized to control the delay piston 2 and the opening piston 3 to open the water outlet 11 for water drainage, and the backflow preventing device 4 is also arranged, so that the backflow preventing device 4 can not only discharge water during water drainage, but also effectively prevent water from flowing backwards during water backflow; be provided with and open the piston and prevent the refluence device, dual prevent the refluence setting, design benefit, prevent that refluence is effectual, easily control prevents that our drinking water from receiving the pollution, protects our health, and user uses and experiences well.

As shown in fig. 3 to 8, in the present embodiment, the backflow prevention device 4 includes a first pressure relief plug 41, a second pressure relief plug 42 inserted into the first pressure relief plug 41, and a return spring 43 having one end abutting against the first pressure relief plug 41, the first pressure relief plug 41 is provided with an insertion hole 411, and the second pressure relief plug 42 is provided with an insertion portion 421 which is inserted into the insertion hole 411 and partially exposed after being assembled; a mounting cavity 13 is arranged in the delay tube 1, a raised pressure relief part 14 is arranged on the peripheral surface of the delay tube 1, the pressure relief cavity 12 is arranged in the pressure relief part 14, the pressure relief cavity 12 is communicated with the mounting cavity 13 through the water outlet 11, a pressure relief opening 16 communicated with the pressure relief cavity 12 is formed in the pressure relief part 14, an opening is formed in one end, far away from the delay tube 1, of the pressure relief part 14, and a connector 5 covering the opening is further sleeved on the pressure relief part 14; furthermore, in the present embodiment, the delay tube 1 is disposed on the mounting seat 16, the mounting seat 16 can be separately disposed according to actual conditions, and the joint 5 is hermetically connected to the relief portion 14; the first pressure relief plug 41 comprises a pressure relief plug body 412 and a fixing part 413 which is integrally formed with the pressure relief plug body 412, the return spring 43 is sleeved outside the pressure relief plug body 412, one end of the return spring 43 abuts against the fixing part 413, the other end of the return spring 43 abuts against the joint 5, and the diameter of the fixing part 413 is smaller than or equal to that of the pressure relief cavity 12 and larger than that of the water outlet 11; the fixing part 413 is provided with an accommodating cavity 414 with an opening facing to one end far away from the pressure relief plug body 412, the insertion hole 411 is communicated with the accommodating cavity 414, the second pressure relief plug 42 is provided with a first sealing part 422 which is abutted against the bottom wall of the accommodating cavity 414 after being assembled, and the inserting part 421 is provided with a plurality of water drainage channels 423 for water to flow; as shown in fig. 7 to 8, after water flows into the pressure relief chamber 12 from the water outlet 11, the first pressure relief plug 41 and the second pressure relief plug 42 are pressed against the joint 5 under the action of water pressure, and there is a misalignment therebetween, and at this time, the fixing portion 413 is pressed against the discharge port 16, so that water is discharged through the joint 5 after passing through the insertion hole 411 and the drainage channel 423; as shown in fig. 4 and fig. 6, after the water inlet is finished, the return spring 43 pushes the first pressure relief plug 41 and the second pressure relief plug 42 to return and the delay piston 2 to return, one end of the opening piston 3 is rested against the water outlet 11, and at this time, the fixing portion 413 is removed from the water outlet 16, so that the water returning from the joint 5 to the pressure relief cavity 12 flows out from the water outlet 16, so that the container, the device or other components communicated with the joint 5 are returned; when a container, a device or other components communicated with the joint 5 needs to be reset or water flows back into the pressure relief cavity 12, the drain port 16 is used for draining the returned water; when the container, the device or other components communicated with the joint 5 do not need to reset or the water does not need to flow back, after the water supply to the delay tube 1 is stopped, the water in the container, the device or other components flows out through the drainage port of the container, the device or other components or the drainage port connected with the container or the device or other components, and does not need to flow back to the pressure relief cavity 12, so the design is ingenious, the structure is simple, and the assembly and disassembly are convenient; furthermore, in this embodiment, the joint 5 is connected to the drain valve, and when the drain valve is reset, the joint pushes water to flow back into the pressure relief chamber 12, so that the water flows back out from the drain port 16, thereby facilitating the reset of the drain valve.

As shown in fig. 3 to 8 and 10, in this embodiment, a convex mounting portion 15 is further disposed on an outer circumferential surface of the delay tube 1 away from the pressure relief portion 14, a movable cavity 151 aligned with the pressure relief cavity 12 is disposed in the mounting portion 15, the opening piston 3 includes a second sealing portion 31 abutting against the water outlet 11, a movable insertion portion 32 movably disposed in the movable cavity 151 after assembly, and a linkage hole 33, the linkage hole 33 is disposed between the second sealing portion 31 and the movable insertion portion 32 and located at a side close to the second sealing portion 31, a gasket 34 is sleeved on the second sealing portion 31, and further, in an initial state, an axis of the linkage hole 33 is not aligned with an axis of the delay tube 1, so that under the elastic force of the auxiliary spring 37, the second sealing portion 31 and the gasket 34 abut against the water outlet 11, sealing is completed; when water is drained, the pushing part 212 pushes the opening piston 3 to move transversely, so that the axis of the linkage hole 33 is overlapped with the axis of the delay tube 1, the second sealing part 31 and the gasket 34 are separated from the water outlet 11, and water is drained from the water outlet 11; be provided with sealing washer 35 on the activity inserted part 32, the cover is equipped with installation lid 36 on the installation department 15, still be provided with auxiliary spring 37 in the activity chamber 151, auxiliary spring 37 one end is supported on the activity inserted part 32, the auxiliary spring 37 other end supports on the installation lid 36, delay piston 2 includes time delay piston 21 down, through the fixed setting of bolt 23 last time delay piston 22 and the piston spring 24 of setting in last time delay piston 22 upper end on time delay piston 21 down, time delay piston 21 is provided with down and inserts after the assembly and establish the first inserted bar 211 of linkage hole 33 and be used for promoting open piston 3's promotion portion 212, further say, the axis of activity chamber 151 with the axis coincidence of pressure release chamber 12, the axis of activity chamber 151 or the axis of pressure release chamber 12 with the axis of time delay pipe 1 is perpendicular, facilitating the movement of the opening piston 3.

As shown in fig. 3 to 5 and 9, in this embodiment, a time adjustment device 6 is further disposed at the upper end of the delay tube 1, the time adjustment device 6 includes a delay adjustment cover 61 covering the opening and a time adjustment knob 62 disposed on the delay adjustment cover 61, the delay adjustment cover 61 is provided with a plurality of exhaust holes 611 with different diameters, and the time adjustment knob 62 is provided with a through hole 620; the diameter of the through hole 620 is larger than that of any one of the exhaust holes 611; adopt time adjusting device 6 to adjust the closestool flushing time, when needs are adjusted, move the setting on the closestool through twisting time adjust knob 62 makes through-hole 620 switches rather than the exhaust hole 611 of aligning, because exhaust hole 611 is provided with a plurality of and the diameter is different, makes through switching exhaust hole 611 and changes exhaust speed to change the action time of time delay piston 2, and then adjust the time of opening piston 3, convenient and fast need not the dismouting device, can adjust the time of opening piston 3 at any time, and the scope of adjusting is wide, has improved regulation efficiency, and the design is ingenious, and the part is few, easy dismounting.

As shown in fig. 3 to 5 and 9, in this embodiment, a mounting cavity 13 is disposed in the delay tube 1, an opening communicated with the mounting cavity 13 is disposed at the upper end of the delay tube 1, a first water inlet 131 communicated with the mounting cavity 13 is further disposed at the lower end of the delay tube 1, the delay piston 2 is disposed in the mounting cavity 13 so as to divide the mounting cavity 13 into an upper mounting cavity 132 at the upper end of the delay piston 2 and a lower mounting cavity 133 at the lower end of the delay piston 2, the delay adjusting cover 61 is provided with a first accommodating cavity 612 into which the delay tube 1 is inserted, and the exhaust hole 611 is communicated with the first accommodating cavity 612; when water enters the lower mounting chamber 133 from the first water inlet 131, the water pushes the delay piston 2 to move upwards, so that the gas in the upper mounting chamber 132 is discharged through the through hole 620 and the exhaust hole 611; the time adjusting knob 62 is provided with a delay adjusting baffle 63, the through hole 620 is arranged on the delay adjusting baffle 63, the delay adjusting cover 61 is further provided with a first mounting hole 613 communicated with the first accommodating cavity 612, the delay adjusting baffle 63 is further provided with a first inserting portion 631 inserted into the first mounting hole 613 after assembly, the first inserting portion 631 of the delay adjusting baffle 63 passes through the first mounting hole 613 of the delay adjusting cover 61 and then is connected with the time adjusting knob 62 through a second inserting rod 64, a second mounting hole 632 is further arranged in the first inserting portion 631, and the time adjusting knob 62 is provided with a second inserting portion 621 inserted into the second mounting hole 632 after assembly; a first insertion hole is formed in the bottom wall of the second installation hole 632, a second insertion hole is formed in the second insertion portion 621, the second insertion rod 64 is inserted into the second insertion hole and the first insertion hole, an insertion key is further arranged on the inner wall of the second installation hole 632, and an insertion groove which is matched with the insertion key in the axial direction is formed in the periphery of the second insertion portion 621; furthermore, the upper end of the delay tube 1 is further provided with a sealing groove, a sealing ring is arranged in the sealing groove, so that the time adjusting device 6 is hermetically connected with the delay tube 1, and the gas in the upper end of the delay piston 2 in the installation cavity 11 can only be discharged through the through hole 620 and the exhaust hole 611; the time adjusting device 6 is arranged into a whole body which can be replaced and debugged at any time, can be assembled and then fixedly connected to the delay tube 1, is convenient and quick to disassemble and assemble, and can be also arranged on other containers, devices or other components which can not adjust time, so that the time adjusting device has the function of adjusting time, is convenient to replace and has strong interchangeability.

As shown in fig. 4 to 5 and 9, in this embodiment, a positioner 7 is further disposed in the time adjustment device 6, the positioner 7 includes a second accommodating cavity 71 disposed on the delay adjustment cover 61, a ball 72 disposed in the second accommodating cavity 71, and a plurality of positioning holes 74 axially distributed on the time adjustment knob 62, the positioner 7 further includes a first spring 73, the first spring 73 is used for jacking the ball 72 and partially inserting the ball 72 into the positioning hole 74, and a second spring 65 jacking the time adjustment knob 62 is further disposed between the delay adjustment cover 61 and the time adjustment knob 62; when the time adjusting knob 62 is rotated, since the upper end of the marble 72 is hemispherical, the lower end of the positioning hole 76 abuts against the hemisphere, so that the marble 72 compresses the first spring 73 downward and moves downward, the time adjusting knob 62 is continuously rotated, so that the marble 72 is switched to the positioning hole 76 matched with the marble 72, the through hole 620 is switched to the exhaust hole 611 aligned with the through hole, the first spring 73 abuts against the marble 72 to the positioning hole 76 under the action of elastic force, the time adjusting knob 62 is prevented from rotating during operation, and the time adjusting knob 62 is further provided with a digital scale, so that a user can conveniently and intuitively know the prolonged time.

Claims (10)

1. The utility model provides a structure is opened in water pressure open prevent flowing backwards, includes time delay pipe (1), sets up time delay piston (2) in time delay pipe (1), its characterized in that: an opening piston (3) and a backflow prevention device (4) which are linked with the delay piston (2) are further arranged in the delay tube (1), one end of the opening piston (3) abuts against one end of a water outlet (11), a pressure relief cavity (12) communicated with the water outlet (11) is further arranged on one side of the delay tube (1), and the backflow prevention device (4) is arranged in the pressure relief cavity (12); when water pushes the delay piston (2) to drive the opening piston (3) to move, the water is discharged from the water outlet (11) and pushes the backflow prevention device (4) to move, and the water is discharged after passing through the backflow prevention device (4); when water flows backwards, the backflow preventing device (4) is propped against the other end of the water outlet (11) by the water, so that the water is prevented from flowing backwards.

2. The hydraulically opened backflow prevention opening structure according to claim 1, wherein: the backflow prevention device (4) comprises a first pressure relief plug (41), a second pressure relief plug (42) inserted into the first pressure relief plug (41) and a return spring (43) with one end abutting against the first pressure relief plug (41), the first pressure relief plug (41) is provided with an insertion hole (411), and the second pressure relief plug (42) is provided with an insertion part (421) which is inserted into the insertion hole (411) after assembly and is partially exposed; the delay tube is characterized in that a mounting cavity (13) is arranged in the delay tube (1), a raised pressure relief portion (14) is arranged on the peripheral surface of the delay tube (1), the pressure relief portion (12) is arranged in the pressure relief portion (14), the pressure relief portion (12) is communicated with the mounting cavity (13) through the water outlet (11), a flow relief port (16) communicated with the pressure relief portion (12) is formed in the pressure relief portion (14), an opening is formed in one end, far away from the delay tube (1), of the pressure relief portion (14), and a connector (5) covering the opening is further sleeved on the pressure relief portion (14).

3. The hydraulically opened backflow prevention opening structure according to claim 2, wherein: first pressure relief stopper (41) including pressure relief stopper main part (412) and with pressure relief stopper main part (412) integrated into one piece's fixed part (413), reset spring (43) cover is established outside pressure relief stopper main part (412) just the one end of reset spring (43) is supported on fixed part (413), the other end of reset spring (43) is supported on joint (5), the diameter of fixed part (413) is less than or equal to the diameter of pressure relief chamber (12) and is greater than the diameter of delivery port (11).

4. The hydraulically opened backflow prevention opening structure according to claim 3, wherein: the fixing portion (413) is provided with an accommodating cavity (414) with an opening facing away from one end of the pressure relief plug body (412), the insertion hole (411) is communicated with the accommodating cavity (414), the second pressure relief plug (42) is provided with a first sealing portion (422) which is abutted to the bottom wall of the accommodating cavity (414) after assembly, and the insertion portion (421) is provided with a plurality of drainage channels (423) for water to flow.

5. The hydraulically opened backflow prevention opening structure according to claim 1, wherein: the utility model discloses a pressure relief portion (14) is kept away from in time delay pipe (1) on the outer peripheral face still be provided with bellied installation department (15), be provided with in installation department (15) with the activity chamber (151) that pressure relief portion (12) are aimed at, it sets up including supporting second sealing (31), the activity after the assembly on delivery port (11) is in activity insertion portion (32) and linkage hole (33) in activity chamber (151), set up in linkage hole (33) just be located and be close to between second sealing (31) and the activity insertion portion (32) one side of second sealing (31), the cover is equipped with packing ring (34) on second sealing (31).

6. The hydraulically opened backflow prevention opening structure according to claim 5, wherein: be provided with sealing washer (35) on activity portion of inserting (32), the cover is equipped with installation lid (36) on installation department (15), still be provided with auxiliary spring (37) in activity chamber (151), auxiliary spring (37) one end is supported on activity portion of inserting (32), auxiliary spring (37) other end is supported on installation lid (36), time delay piston (2) including time delay piston (21) down, set up through bolt (23) are fixed last time delay piston (22) on time delay piston (21) down and set up piston spring (24) in time delay piston (22) upper end, time delay piston (21) down are provided with and peg graft after the assembly and are in first inserted bar (211) of linkage hole (33) and are used for promoting open promotion portion (212) of piston (3).

7. The hydraulically opened backflow prevention opening structure according to claim 1, wherein: the upper end of the delay tube (1) is also provided with a time adjusting device (6), the time adjusting device (6) comprises a delay adjusting cover (61) covered on the opening and a time adjusting knob (62) arranged on the delay adjusting cover (61), the delay adjusting cover (61) is provided with a plurality of exhaust holes (611) with different apertures, and the time adjusting knob (62) is provided with a through hole (620); the aperture of the through hole (620) is larger than or equal to the aperture of the exhaust hole (611) with the largest aperture.

8. The hydraulically opened backflow prevention opening structure according to claim 7, wherein: a mounting cavity (13) is arranged in the delay tube (1), an opening communicated with the mounting cavity (13) is formed in the upper end of the delay tube (1), a first water inlet hole (131) communicated with the mounting cavity (13) is further formed in the lower end of the delay tube (1), the delay piston (2) is arranged in the mounting cavity (13) to enable the mounting cavity (13) to be divided into an upper mounting cavity (132) located at the upper end of the delay piston (2) and a lower mounting cavity (133) located at the lower end of the delay piston (2), the delay adjusting cover (61) is provided with a first accommodating cavity (612) into which the delay tube (1) is inserted, and the exhaust hole (611) is communicated with the first accommodating cavity (612); when water enters the lower mounting cavity (133) from the first water inlet hole (131), the water pushes the delay piston (2) to move upwards, so that the gas in the upper mounting cavity (132) is discharged through the through hole (620) and the exhaust hole (611).

9. The hydraulically opened backflow prevention opening structure according to claim 8, wherein: the time adjusting knob (62) is provided with a time delay adjusting baffle (63), the through hole (620) is arranged on the time delay adjusting baffle (63), the delay adjusting cover (61) is also provided with a first mounting hole (613) communicated with the first accommodating cavity (612), the time delay adjusting baffle (63) is also provided with a first inserting part (631) inserted in the first mounting hole (613) after being assembled, the first inserting part (631) of the delay adjusting baffle (63) passes through the first mounting hole (613) of the delay adjusting cover (61) and then is connected with the time adjusting knob (62) through the second inserting rod (64), a second mounting hole (632) is further formed in the first insertion part (631), and a second insertion part (621) which is inserted into the second mounting hole (632) after assembly is arranged on the time adjusting knob (62); first patchhole has been seted up to the diapire of second mounting hole (632), be provided with the second patchhole in second inserted part (621), second inserted bar (64) are inserted and are established in second patchhole and the first patchhole, the inner wall of second mounting hole (632) still is provided with the inserted key, be provided with on the periphery of second inserted part (621) with the slot of inserted key to the adaptation.

10. The hydraulically opened backflow prevention opening structure as set forth in claim 9, wherein: still be provided with locator (7) in time adjusting device (6), locator (7) are including setting up second on time delay adjusting cover (61) holds chamber (71), sets up marble (72) in second holds chamber (71) still be provided with a plurality of along axially distributed's locating hole (74) on time adjusting knob (62), locator (7) still include first spring (73), first spring (73) are used for with marble (72) jack-up and make its part insert in locating hole (74), still be provided with between time delay adjusting cover (61) and time adjusting knob (62) with second spring (65) that time adjusting knob (62) jack-up.

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