CN212375965U - Drain valve with non-return structure - Google Patents

Abstract

The utility model discloses a drain valve with a non-return structure, which comprises a drain base, wherein the drain base is provided with a water outlet communicated with a toilet water tank and a drain passage communicated with a toilet urinal, the water outlet is communicated with the drain passage, a water retaining sheet is movably arranged on the drain passage, and the water retaining sheet moves between an opening position for opening the drain passage and a closing position for closing the drain passage; when the drainage channel drains water, the water retaining sheet is positioned at the opening position; when the drainage channel flows reversely, the water retaining sheet is positioned at the closing position; thereby avoiding the sewage from reversely flowing into the water tank to generate water pollution, and having ingenious structure and stable performance.

Description

Drain valve with non-return structure

Technical Field

The utility model relates to a drain valve with end contrary structure.

Background

The toilet sometimes has a clogged sewer line during use, especially for low tank toilets. The existing closestool is attractive and saves space, and the closestool water tank is lower, so that the blockage phenomenon is easier to occur.

When the closestool is blocked and is dredged by using a closestool dredging tool, impurities and dirt in the water storage bay can easily flow back to the water tank of the closestool, so that water pollution of the water tank is caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve above-mentioned problem, provide a drain valve with end contrary structure, through set up the breakwater piece on the drainage channel at the drain valve, the breakwater piece can avoid sewage to produce water pollution in water tank against the current, and the structure is ingenious, stable performance.

In order to achieve the above object, the utility model adopts the following technical scheme:

a drain valve with a non-return structure comprises a drain base (10), wherein the drain base (10) is provided with a drain outlet (11) communicated with a toilet tank and a drain passage (12) communicated with a toilet bowl, the drain outlet (11) is communicated with the drain passage (12), a water retaining sheet (20) is movably arranged on the drain passage (12), and the water retaining sheet (20) moves between an opening position for opening the drain passage (12) and a closing position for closing the drain passage (12); when the drainage channel (12) drains water, the water retaining sheet (20) is located at the opening position; when the drainage channel (12) flows reversely, the water retaining sheet (20) is located at the closed position.

Preferably, the water blocking sheet (20) is rotatably attached to the side wall of the drain passage (12) by means of a hinge shaft (30); the hinge shaft (30) and the water retaining sheet (20) are integrally formed or are connected in a split mode, and a shaft hole (13) which is matched with the hinge shaft (30) in a hinged mode is formed in the side wall of the drainage channel (12).

Furthermore, the shaft hole (13) is a blind hole and is arranged on the inner wall of the drainage channel (12); the hinge shaft (30) is an elastic shaft with an axial telescopic property, the hinge shaft (30) is arranged in the drainage channel (12) through axial deformation, and when the two ends of the hinge shaft (30) move to correspond to the blind holes in position, the hinge shaft (30) is elastically reset and clamped in the blind holes.

Further, the hinge shaft (30) comprises a first shaft section and a second shaft section, and a pressure spring (31) is elastically pressed between the first shaft section and the second shaft section.

Preferably, the shaft hole (13) penetrates through a side wall of the drain passage (12), and a sealing member (131) is provided between the hinge shaft (30) and the shaft hole (13); articulated shaft (30) are the rigidity axle, articulated shaft (30) one end be equipped with spacing portion (32) in shaft hole (13) edge, the other end be equipped with shaft hole (13) or a nut (60) spiro union is fixed screw portion (33), articulated shaft (30) pass through spacing portion (32) with screw portion (33) are fixed in drainage channel (12).

Preferably, the water blocking sheet (20) comprises a first water blocking sheet and a second water blocking sheet, the first water blocking sheet and the second water blocking sheet are hinged on the hinge shaft (30), the first water blocking sheet and the second water blocking sheet are in a relatively folded state in the opening position, and the first water blocking sheet and the second water blocking sheet are in a relatively unfolded state in the closing position.

Furthermore, a first shaft sleeve (21) is arranged on the first water retaining sheet, and the hinge shaft (30) is integrally formed on the first water retaining sheet and the second water retaining sheet; the hinge shaft (30) on the first water retaining sheet is positioned at the outer side of the first water retaining sheet and is in hinged fit with the shaft hole (13), and the first shaft sleeve (21) on the first water retaining sheet is positioned at the inner side of the first water retaining sheet and is in hinged fit with the hinge shaft (30) on the second water retaining sheet.

Preferably, a limiting part is further provided for limiting rotation of the first water blocking piece and the second water blocking piece, and when the water blocking piece (20) moves from the open position to the closed position, the first water blocking piece and the second water blocking piece respectively rotate towards two sides under the action of the limiting part.

Furthermore, the limiting part is located between the first water retaining sheet and the second water retaining sheet, and/or the limiting part comprises a water retaining sheet limiting rib (22) arranged on the water retaining sheet (20) and a base limiting rib (14) arranged on the drainage base (10), and the water retaining sheet limiting rib (22) and the base limiting rib (14) are abutted and matched to limit the rotation of the water retaining sheet (20).

Furthermore, two ends of the first water retaining sheet and the second water retaining sheet are respectively provided with a first shaft sleeve (21), the limiting piece is provided with a second shaft sleeve (41), the first shaft sleeve (21) and the second shaft sleeve (41) are coaxially arranged, and the first shaft sleeve (21) is arranged at two ends of the second shaft sleeve (41); the articulated shaft (30) is a single shaft and sequentially penetrates through the first shaft sleeve (21) at one end, the second shaft sleeve (41) and the first shaft sleeve (21) at the other end; or, the articulated shaft (30) comprises a first shaft section and a second shaft section, and the first shaft section and the second shaft section respectively extend outwards from the second shaft sleeve (41) to the first shaft sleeve (21) at two ends.

Preferably, the density of the material of the water retaining sheet (20) is less than that of water, and when the drainage channel (12) flows reversely, the water retaining sheet (20) floats to the closed position under the buoyancy of the water.

Preferably, the drainage base (10) is further provided with an overflow pipe (50), the bottom of the overflow pipe (50) is provided with an overflow port (51) communicated with the drainage channel (12), and the water blocking piece (20) is located below the overflow port (51).

The utility model has the advantages that:

(1) the water retaining sheet is arranged on the drainage channel of the drainage valve, and when the drainage valve drains water, the water retaining sheet is positioned at the position of opening the drainage channel to drain water; when the drainage channel flows reversely, the water retaining sheet is positioned at the position for closing the drainage channel, so that the sewage is prevented from flowing reversely into the water tank to generate water pollution, the structure is ingenious, and the performance is stable;

(2) the water retaining sheet is rotatably connected in the drainage channel by adopting a hinge shaft, so that the water retaining sheet can be more flexibly switched between an opening position and a closing position, and the function is more reliable;

(3) the water retaining sheet is of a two-sheet structure, is folded in the drainage channel during drainage or overflow and extends along the water flow direction, so that the influence on the drainage efficiency can be reduced;

(4) the water stop device is also provided with a limiting piece for limiting the rotation of the first water retaining sheet and the second water retaining sheet, when the water retaining sheets move from the opening position to the closing position, the first water retaining sheet and the second water retaining sheet respectively rotate towards two sides under the action of the limiting piece, so that the problem that the first water retaining sheet overturns towards one side of the second water retaining sheet or the second water retaining sheet overturns towards one side of the first water retaining sheet, only one part of the water drainage channel can be closed, and the other part of the water drainage channel cannot be closed is avoided, so that the two water retaining sheets can be smoothly unfolded to the closing position, and the stability of the non-return function is ensured;

(5) the water retaining sheet is made of a material with density smaller than that of water, so that the water retaining sheet can automatically float to a closing position under the buoyancy action of water during countercurrent, the water retaining sheet is more reliable, and the structure is simpler;

(6) the water retaining piece is arranged below the overflow port, not only can backflow water be prevented from flowing back into the water tank from the water outlet, but also backflow water can be prevented from flowing back into the water tank from the overflow port, the backflow problem is fundamentally solved, and the effect is better.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is a first direction sectional view showing a state where a water blocking piece of a drain valve with a non-return structure according to a first embodiment of the present invention closes a drain passage;

fig. 2 is a first direction sectional view showing a state where a water blocking piece of the drain valve with a non-return structure according to the first embodiment of the present invention opens the drain passage;

fig. 3 is a second sectional view of the water discharge valve with a non-return structure according to the first embodiment of the present invention in a state where the water blocking plate opens the water discharge passage;

fig. 4 is an exploded view schematically illustrating a drain valve with a check structure according to a second embodiment of the present invention;

fig. 5 is a second sectional view of the drain valve with a non-return structure according to the second embodiment of the present invention, showing the water passage opened by the water blocking plate;

fig. 6 is a second sectional view of the drain valve with a non-return structure according to the third embodiment of the present invention in a state where the water blocking plate closes the drain passage;

fig. 7 is a first direction sectional view showing a state where a drain passage is opened by a water blocking piece of a drain valve with a non-return structure according to a third embodiment of the present invention;

fig. 8 is an exploded view schematically illustrating a discharge valve with a check structure according to a third embodiment of the present invention;

fig. 9 is a second sectional view of the fourth embodiment of the present invention showing a state where the water blocking plate closes the drainage passage;

fig. 10 is a second sectional view of the drain valve with a non-return structure according to the fifth embodiment of the present invention, showing a state where the water blocking plate closes the drain passage;

fig. 11 is an exploded view schematically illustrating a drain valve with a check structure according to a fifth embodiment of the present invention; in the figure:

10-a drainage base; 11-a water outlet; 12-a drainage channel; 13-shaft hole; 131-a seal; 14-base limit ribs; 15-a limiting groove; 16-an annular water stop flange;

20-water retaining pieces; 21-a first sleeve; 22-water retaining sheet limiting ribs;

30-a hinge axis; 31-a pressure spring; 32-a limiting part; 33-a threaded portion;

40-a limiting piece (a limiting piece); 41-second shaft sleeve; 42-a limit post;

50-an overflow pipe; 51-overflow port;

60-nut.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The utility model provides a drain valve with non-return structure, including drainage base 10, drainage base 10 has the outlet 11 with toilet tank intercommunication, the drainage channel 12 with toilet bowl intercommunication, outlet 11 with drainage channel 12 communicates, the movable dress has been connect with manger plate 20 on drainage channel 12, manger plate 20 is in the open position of opening drainage channel 12 and close the closed position of drainage channel 12 and move about; when the drainage channel 12 drains water, the water blocking sheet 20 is located at the opening position; when the drainage channel 12 is in reverse flow, the water blocking sheet 20 is located at the closed position.

Wherein, the water baffle 20 can be connected in the drainage channel 12 by adopting sliding connection or rotating connection or swinging connection; when the water blocking sheet 20 is located at the opening position, it can be folded outside the drainage channel 12, or folded on the side wall of the drainage channel 12, or folded in the middle of the inner cavity of the drainage channel 12, so as to reduce the influence on the drainage efficiency to the maximum; the water blocking sheet 20 may move under the buoyancy of water, or under the action of its own weight or a counterweight, or under the elastic force of an elastic member, which is not limited to this.

It should be noted that the water blocking sheet 20 may be in two initial states of an open position or a closed position when the drainage channel 12 is not drained, in one case, when the drainage channel 12 is not drained, the water blocking sheet 20 is in the open position, and when the drainage channel 12 is in reverse flow, the water blocking sheet 20 moves from the open position to the closed position under the pressure of the reverse flow water and/or forms buoyancy in the reverse flow water; alternatively, the water deflector 20 may be in the closed position when the drain 12 is not draining, and the water deflector 20 may continue to remain in the closed position when the drain 12 is flowing backwards.

The specific embodiments are exemplified as follows:

first embodiment (the hinge shaft 30 has a sectional type structure)

As shown in fig. 1 to 3, in the present embodiment, the water guard plate 20 is rotatably attached to the side wall of the drain passage 12 by means of a hinge shaft 30. The water guard plate 20 is rotationally switched between an open position for opening the drain passage 12 and a closed position for closing the drain passage 12; when the drainage channel 12 drains water, the water blocking sheet 20 is located at the opening position; when the drainage channel 12 stops water or the drainage channel 12 reversely flows, the water blocking piece 20 rotates to the closed position.

The water blocking sheet 20 includes a first water blocking sheet and a second water blocking sheet, the first water blocking sheet and the second water blocking sheet are symmetrically hinged on the hinge shaft 30, the first water blocking sheet and the second water blocking sheet are in a relatively folded state when in the open position, and the first water blocking sheet and the second water blocking sheet are in a relatively unfolded state when in the closed position.

In this embodiment, a limiting member is further provided for limiting rotation of the first water blocking piece and the second water blocking piece, and when the water blocking piece 20 moves from the open position to the closed position, the first water blocking piece and the second water blocking piece rotate towards two sides respectively under the action of the limiting member. In this embodiment, the limiting member is a limiting piece 40, the limiting piece 40 is located between the first water blocking piece and the second water blocking piece, two ends of the limiting piece 40 are further provided with limiting posts 42, a corresponding position of the inner wall of the drainage channel 12 is provided with a limiting groove 15, the limiting piece 40 is located in the center of the inner cavity of the drainage channel 12 through the insertion fit of the limiting posts 42 and the limiting groove 15, and the limiting posts 42 slide to the locating positions on the limiting groove 15 through the limiting grooves 15.

The hinge shaft 30 is connected with the water retaining sheet 20 in a split manner, the side wall of the drainage channel 12 is provided with two shaft holes 13 which are matched with the hinge shaft 30 in a hinged manner, and the two shaft holes 13 are arranged oppositely; the shaft hole 13 is a blind hole and is arranged on the inner wall of the drainage channel 12; the hinge shaft 30 is an elastic shaft that is axially stretchable, and the hinge shaft 30 is axially deformed by axially compressing the hinge shaft 30 and is installed in the drain passage 12, and the hinge shaft 30 is elastically restored and is caught in the blind hole when both ends of the hinge shaft 30 are moved to positions corresponding to the blind hole. A guide structure for guiding both ends of the hinge shaft 30 to slide to the blind holes is provided on the inner wall of the drain passage 12.

Specifically, two ends of the first water retaining sheet and the second water retaining sheet are respectively provided with a first shaft sleeve 21, the limiting sheet 40 is provided with a second shaft sleeve 41, the first shaft sleeve 21 and the second shaft sleeve 41 are coaxially arranged, and the first shaft sleeve 21 is arranged at two ends of the second shaft sleeve 41; moreover, the hinge shaft 30 comprises a first shaft section and a second shaft section, and a pressure spring 31 is elastically pressed between the first shaft section and the second shaft section; the pressure spring 31 is arranged in the second shaft sleeve 41 on the limiting piece 40, one end of the first shaft section extends into the second shaft sleeve 41 to be matched with one end of the pressure spring 31 in a propping manner, and the other end of the first shaft section extends into one shaft hole 13 on the inner wall of the drainage channel 12; one end of the second shaft section is inserted into the second shaft sleeve 41 and is in abutting fit with the other end of the pressure spring 31, and the other end of the second shaft section is inserted into the other shaft hole 13 on the inner wall of the drainage channel 12. Since the shaft hole 13 of the present embodiment is a blind hole, a sealing member may not be required between the hinge shaft 30 and the shaft hole 13.

In this embodiment, the density of the material of the water-retaining sheet 20 is smaller than that of water, and when the drainage channel 12 flows reversely, the water-retaining sheet 20 floats to the closed position under the buoyancy of water. And preferably, the drainage base 10 is further provided with an overflow pipe 50, the bottom of the overflow pipe 50 is provided with an overflow port 51 communicated with the drainage channel 12, and the water blocking sheet 20 is positioned below the overflow port 51.

An annular water stop flange 16 extending along the circumferential direction is formed in the drainage channel 12, the water blocking sheet 20 is attached to the lower end face of the annular water stop flange 16 when rotating upwards from the open position to the closed position, and preferably, a sealing member is arranged between the water blocking sheet 20 and the lower end face of the annular water stop flange 16, so that the water blocking sheet 20 can be in sealing contact with the lower end face of the annular water stop flange 16, further, backflow water is prevented from permeating upwards, and the non-return effect is better. Therefore, the rotation amplitude of the upward rotation of the water blocking sheet 20 can be limited by the lower end face of the annular water stopping flange 16, and the rotation amplitude of the downward rotation of the water blocking sheet 20 can be limited by the limiting sheet 40, so that each water blocking sheet 20 can rotate in the respective rotation angle range, and the function is stable and reliable.

Under the condition that the drain valve is not opened for draining or overflowing, the water blocking piece 20 can be placed at the closed position or the open position, and the water blocking piece 20 is in the open position by the gravity of the water blocking piece 20. In case that the drain valve starts to drain or overflow, the water blocking sheet 20 continues to be kept at the open position (as shown in fig. 2 and 3), and the water flow of the drain opening 11 or the overflow opening 51 above the water blocking sheet 20 is directly discharged from the drain channel 12, so that the drain valve can drain or overflow normally; when the toilet is blocked and the drainage channel 12 generates reverse flow, the water blocking sheet 20 forms buoyancy in the lower reverse flow water and rotates upwards to abut against the lower end face of the annular water stopping flange 16, so that the drainage channel 12 is closed (as shown in fig. 1).

Of course, it is also possible to select that, in the case that the drain valve is not opened for draining or overflowing, the water blocking sheet 20 is in the closed position by an elastic torsion spring (not shown), so that, when the drain valve is started for draining or overflowing, the water blocking sheet 20 is rotated downward to the open position (as shown in fig. 2 and 3) under the water flow impact of the upper drain opening 11 or the overflow opening 51, so that the drain valve can drain or overflow normally; when the drainage or overflow is finished, the water retaining sheet 20 can automatically reset to the closing position under the action of elastic force; when the toilet is blocked and the drainage channel 12 generates reverse flow, the water blocking sheet 20 forms buoyancy in the lower reverse flow water and rotates upwards to abut against the lower end face of the annular water stopping flange 16, so that the drainage channel 12 is closed (as shown in fig. 1).

Second embodiment (the hinge shaft 30 has a one-piece structure)

As shown in fig. 4 to 5, the hinge shaft 30 and the water blocking plate 20 of the present embodiment are still connected in a split manner, the two ends of the first water blocking plate and the second water blocking plate are respectively provided with a first shaft sleeve 21, the limiting plate 40 is provided with a second shaft sleeve 41, the first shaft sleeve 21 and the second shaft sleeve 41 are coaxially arranged, and the first shaft sleeve 21 is arranged at the two ends of the second shaft sleeve 41; the main differences between this embodiment and the first embodiment are:

(1) in this embodiment, the hinge shaft 30 has an integrated structure, that is, the hinge shaft 30 is a single shaft and sequentially passes through the first shaft sleeve 21, the second shaft sleeve 41 and the first shaft sleeve 21 at one end and the other end.

(2) The shaft hole 13 of the present embodiment penetrates the side wall of the drain passage 12, and a sealing member 131 is provided between the hinge shaft 30 and the shaft hole 13.

Wherein, this embodiment the articulated shaft 30 is the rigid shaft, articulated shaft 30 one end be equipped with the spacing portion 32 in shaft hole 13 edge, the other end be equipped with a nut 60 spiro union fixed screw portion 33, articulated shaft 30 passes through spacing portion 32 with screw portion 33 is fixed in drainage channel 12, perhaps, also can not set up nut 60, directly set up the internal thread on the inner wall in shaft hole 13, screw portion 33 is direct fixed with shaft hole 13 spiro union. Preferably, the sealing member 131 is disposed on the inner side of the position-limiting portion 32 and the inner side of the threaded portion 33; the limiting part 32 is limited on the outer wall of the shaft hole 13 on one side, the thread part 33 is provided with a nut which is matched with the corresponding thread connection, and the nut is limited on the outer wall of the shaft hole 13 on the other side.

The rest of the structure and the working process of this embodiment are basically similar to those of the first embodiment, and are not described herein again.

Third embodiment (the hinge shaft 30 has a sectional type structure, and the hinge shaft 30 is integrally formed with the water guard plate 20)

As shown in fig. 6 to 8, the main difference between the present embodiment and the first embodiment is: the hinge shaft 30 is integrally formed with the water guard plate 20; the two ends of the first water blocking piece and the two ends of the second water blocking piece are respectively provided with a first shaft sleeve 21, the hinge shaft 30 is integrally formed at the two ends of the first water blocking piece and the two ends of the second water blocking piece, and the hinge shaft 30 on the first water blocking piece and the second water blocking piece is positioned at the outer side of the first shaft sleeve 21. The hinge shaft 30 at one end of the first water retaining sheet is in hinged fit with one shaft hole 13, and the hinge shaft 30 at the corresponding end of the second water retaining sheet is in hinged fit with the first shaft sleeve 21 at the end of the first water retaining sheet; the hinge shaft 30 at the other end of the first water retaining sheet is in hinged fit with the first shaft sleeve 21 at the corresponding end of the second water retaining sheet, and the hinge shaft 30 at the corresponding end of the second water retaining sheet is in hinged fit with the other shaft hole 13.

Wherein, the limiting member 40 of the present embodiment does not adopt the limiting sheet 40, and the limiting member 40 is replaced by the following structure: the limiting part 40 comprises a water retaining piece limiting rib 22 arranged on the water retaining piece 20 and a base limiting rib 14 arranged on the drainage base 10, and the water retaining piece limiting rib 22 and the base limiting rib 14 are abutted and matched to limit the downward rotation range of the water retaining piece 20. The annular water stop flange 16 is also adopted in the embodiment to limit the rotation amplitude of the water stop sheet 20 rotating upwards.

Of course, the limiting piece 40 may also be provided in this embodiment, and the limit formed by the limiting piece 40 and the limit formed by the water blocking piece limiting rib 22 and the base limiting rib 14 limit the downward rotation range of the water blocking piece 20. In addition, the shaft hole 13 of the present embodiment may be a blind hole or a through hole.

The rest of the structure and the working process of this embodiment are basically similar to those of the first embodiment, and are not described herein again.

The fourth embodiment (the hinge shaft 30 has a sectional type structure, a part of the hinge shaft 30 is formed integrally with the water guard plate 20, a part of the hinge shaft 30 is formed separately from the water guard plate 20 by a sleeve-joint fit)

As shown in fig. 9, the present embodiment is a combination of the first embodiment and the third embodiment; specifically, one end of the water blocking sheet 20 adopts a structure that the hinge shaft 30 of the third embodiment is integrally formed with the water blocking sheet 20, and the other end adopts a structure that the hinge shaft 30 of the first embodiment is in split sleeve fit with the water blocking sheet 20.

In addition, the stopper 40 of the present embodiment has the same structure as that of the third embodiment.

The specific structure and working process of this embodiment can refer to the related descriptions of the first embodiment and the third embodiment, which are not repeated herein.

Fifth embodiment (the hinge shaft 30 has a sectional structure, and the hinge shaft 30 and the water guard plate 20 are in a split sleeve fit)

As shown in fig. 10 to 11, the main difference between the present embodiment and the first embodiment is: the hinge shaft 30 and the water blocking sheet 20 of the embodiment are still connected in a split manner, the two ends of the first water blocking sheet and the second water blocking sheet are respectively provided with a first shaft sleeve 21, the limiting sheet 40 is provided with a second shaft sleeve 41, the first shaft sleeve 21 and the second shaft sleeve 41 are coaxially arranged, and the first shaft sleeve 21 is arranged at the two ends of the second shaft sleeve 41; the main differences between this embodiment and the first embodiment are:

(1) the hinge shaft 30 in this embodiment is a rigid shaft;

(2) the hinge shaft 30 of the present embodiment includes a first shaft section and a second shaft section, which respectively extend from the second shaft sleeve 41 to the first shaft sleeve 21 at both ends, so that a compression spring is not required to be disposed between the first shaft section and the second shaft section;

(3) the shaft hole 13 can be a blind hole or a through hole.

The rest of the structure and the working process of this embodiment are basically similar to those of the first embodiment, and are not described herein again.

In other preferred embodiments, the structure of the limiting member 40 in the first and second embodiments and the structure of the limiting member 40 in the third and fourth embodiments may be provided at the same time.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims (12)

1. A drain valve with a non-return structure comprises a drain base (10), wherein the drain base (10) is provided with a drain outlet (11) communicated with a toilet tank and a drain passage (12) communicated with a toilet bowl, the drain outlet (11) is communicated with the drain passage (12), and the drain valve is characterized in that a water retaining sheet (20) is movably arranged on the drain passage (12), and the water retaining sheet (20) moves between an opening position for opening the drain passage (12) and a closing position for closing the drain passage (12); when the drainage channel (12) drains water, the water retaining sheet (20) is located at the opening position; when the drainage channel (12) flows reversely, the water retaining sheet (20) is located at the closed position.

2. The drain valve with a non-return structure according to claim 1, wherein: the water retaining sheet (20) is rotatably connected to the side wall of the drainage channel (12) through a hinge shaft (30); the hinge shaft (30) and the water retaining sheet (20) are integrally formed or are connected in a split mode, and a shaft hole (13) which is matched with the hinge shaft (30) in a hinged mode is formed in the side wall of the drainage channel (12).

3. The drain valve with a non-return structure according to claim 2, wherein: the shaft hole (13) is a blind hole and is arranged on the inner wall of the drainage channel (12); the hinge shaft (30) is an elastic shaft with an axial telescopic property, the hinge shaft (30) is arranged in the drainage channel (12) through axial deformation, and when the two ends of the hinge shaft (30) move to correspond to the blind holes in position, the hinge shaft (30) is elastically reset and clamped in the blind holes.

4. The drain valve with a backstop structure as claimed in claim 3, wherein: the articulated shaft (30) comprises a first shaft section and a second shaft section, and a pressure spring (31) is elastically propped between the first shaft section and the second shaft section.

5. The drain valve with a non-return structure according to claim 2, wherein: the shaft hole (13) penetrates through the side wall of the drainage channel (12), and a sealing piece (131) is arranged between the hinge shaft (30) and the shaft hole (13); articulated shaft (30) are the rigidity axle, articulated shaft (30) one end be equipped with spacing portion (32) in shaft hole (13) edge, the other end be equipped with shaft hole (13) or a nut (60) spiro union is fixed screw portion (33), articulated shaft (30) pass through spacing portion (32) with screw portion (33) are fixed in drainage channel (12).

6. The drain valve with a non-return structure according to claim 2, wherein: the water blocking piece (20) comprises a first water blocking piece and a second water blocking piece, the first water blocking piece and the second water blocking piece are hinged to the hinge shaft (30), the first water blocking piece and the second water blocking piece are in a relatively folded state in the opening position, and the first water blocking piece and the second water blocking piece are in a relatively unfolded state in the closing position.

7. The drain valve with a non-return structure according to claim 6, wherein: the first water retaining sheet is provided with a first shaft sleeve (21), and the articulated shaft (30) is integrally formed on the first water retaining sheet and the second water retaining sheet; the hinge shaft (30) on the first water retaining sheet is positioned at the outer side of the first water retaining sheet and is in hinged fit with the shaft hole (13), and the first shaft sleeve (21) on the first water retaining sheet is positioned at the inner side of the first water retaining sheet and is in hinged fit with the hinge shaft (30) on the second water retaining sheet.

8. The drain valve with a non-return structure according to claim 6, wherein: the water retaining device is characterized by further comprising a limiting piece for limiting rotation of the first water retaining piece and the second water retaining piece, and when the water retaining piece (20) moves from the opening position to the closing position, the first water retaining piece and the second water retaining piece rotate towards two sides respectively under the action of the limiting piece.

9. The drain valve with a non-return structure according to claim 8, wherein: the limiting part is located between the first water retaining sheet and the second water retaining sheet, and/or the limiting part comprises a water retaining sheet limiting rib (22) arranged on the water retaining sheet (20) and a base limiting rib (14) arranged on the drainage base (10), and the water retaining sheet limiting rib (22) and the base limiting rib (14) are abutted and matched to limit the rotation of the water retaining sheet (20).

10. The drain valve with a non-return structure according to claim 8, wherein: two ends of the first water retaining sheet and the second water retaining sheet are respectively provided with a first shaft sleeve (21), the limiting piece is provided with a second shaft sleeve (41), the first shaft sleeve (21) and the second shaft sleeve (41) are coaxially arranged, and the first shaft sleeve (21) is arranged at two ends of the second shaft sleeve (41); the articulated shaft (30) is a single shaft and sequentially penetrates through the first shaft sleeve (21) at one end, the second shaft sleeve (41) and the first shaft sleeve (21) at the other end; or, the articulated shaft (30) comprises a first shaft section and a second shaft section, and the first shaft section and the second shaft section respectively extend outwards from the second shaft sleeve (41) to the first shaft sleeve (21) at two ends.

11. The drain valve with a backstop structure according to any one of claims 1 to 10, characterized in that: the density of the material of the water retaining sheet (20) is smaller than that of water, and when the drainage channel (12) flows reversely, the water retaining sheet (20) floats to the closed position under the buoyancy action of the water.

12. The drain valve with a backstop structure according to any one of claims 1 to 10, characterized in that: the drainage base (10) is further provided with an overflow pipe (50), the bottom of the overflow pipe (50) is provided with an overflow port (51) communicated with the drainage channel (12), and the water retaining sheet (20) is located below the overflow port (51).

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