CN218990347U - Water outlet control valve based on buoyancy control and flushing device of toilet water tank - Google Patents

Abstract

The utility model discloses a buoyancy control-based water outlet control valve and a flushing device of a toilet water tank. The water outlet control valve also comprises a buoyancy mechanism, a connecting rod mechanism and a limiting mechanism. The limiting mechanism is provided with a limiting position and a yielding position, the limiting mechanism can limit the buoyancy mechanism at a low position when being positioned at the limiting position, and the buoyancy mechanism can float and open the water stopping mechanism through the connecting rod mechanism when being positioned at the yielding position. The connecting rod mechanism comprises a connecting rod and a lifting rod which are respectively movably arranged on the valve body, the connecting rod is respectively matched with the buoyancy mechanism and the lifting rod, the lifting rod is matched with the water stopping mechanism, the lifting rod is driven by the connecting rod to open the water stopping mechanism when the buoyancy mechanism floats, the connecting rod is driven by the buoyancy mechanism to separate the connecting rod from the lifting rod when the buoyancy mechanism falls, and the lifting rod can be reset under the action of the reset piece to close the water stopping mechanism.

Description

Water outlet control valve based on buoyancy control and flushing device of toilet water tank

Technical Field

The utility model relates to the technical field of bathrooms, in particular to a water outlet control valve based on buoyancy control and a flushing device of a toilet water tank with the water outlet control valve.

Background

Chinese patent publication No. CN217053634U, entitled "a cistern flushing device for improving flushing ability", discloses a flushing valve 4 capable of assisting cistern flushing, the flushing valve 4 being controlled based on buoyancy. Specifically, the flushing-aiding valve 4 is provided in the water storage chamber 11, and the flushing-aiding valve 4 is attached to the water discharge valve 3. The flushing-assisting valve 4 comprises a control mechanism, a first valve body 42 provided with a water inlet channel 421 and a water outlet channel 422, wherein the control mechanism comprises a second floating barrel 411 which can move up and down between a high position and a low position, and a limiting piece 413 which is movably arranged on the first valve body 42 and can move between a limiting position and a yielding position, and the second floating barrel 411 rises or falls along with the water level change in the water storage cavity 11; the limiting piece 413 can limit the second floating barrel 411 to a low position when being positioned at the limiting position (when the second floating barrel 411 is positioned at the low position, the movable piece 412 closes the pressure release hole 45); the limiting piece 413 can release the limit on the second floating barrel 411 when being positioned at the abdication position, so that the second floating barrel 411 can float upwards to a high position (when the second floating barrel 411 is positioned at the high position, the movable piece 412 opens the pressure release hole 45); when the second floating barrel 411 is positioned at a high position, the control mechanism controls the water inlet channel 421 to be communicated with the water outlet channel 422; when the second floating barrel 411 is positioned at the low position, the control mechanism controls the water inlet channel 421 and the water outlet channel 422 to be disconnected, and at the moment, the limiting piece 413 can be reset to the limiting position from the yielding position; the starting mechanism moves from the limit position to the yielding position by driving the limit piece 413 so as to realize opening of the flushing-assisting valve 4. The movable member 412 is a swing rod rotatably disposed on the first valve body 42, one end of the swing rod is in linkage fit with the second floating barrel 411, the other end of the swing rod is in opening and closing fit with the pressure release hole 45, and the middle of the swing rod is rotatably connected with the first valve body 42. The control mechanism further comprises a screw rod 416, the second floating barrel 411 is specifically connected with one end of the swing rod (namely the movable piece 412) through the screw rod 416, the limiting piece 413 can be in limiting fit with the top of the screw rod 416 when being located at the limiting position so as to limit the second floating barrel 411 at the first falling position, the other end of the swing rod is provided with a sealing gasket 415 which can be in opening and closing fit with the pressure release hole 45, and the sealing gasket 415 and the first elastic piece 414 are located at the same end of the swing rod 412.

However, in the above-mentioned conventional structure, the second floating barrel 411 only controls the pressure release hole 45 to be opened and closed by the movable member 412, and the dimensional accuracy of the cooperation among the second floating barrel 411, the movable member 412, the limiting member 413 and the pressure release hole 45 is required to be high, which is difficult in manufacturing the parts.

Disclosure of Invention

The utility model aims to solve the problems, and provides a water outlet control valve based on buoyancy control and a flushing device of a toilet water tank with the water outlet control valve, which can greatly reduce the requirement on dimensional matching precision, so that the product manufacturing qualification rate is higher.

The technical scheme adopted by the utility model is as follows:

the utility model provides a play water control valve based on buoyancy control, includes the valve body that has inlet channel and play water channel and locates on the valve body in order to be used for controlling inlet channel and play water channel are linked together or tangent the stagnant water mechanism of breaking off, when stagnant water mechanism opens inlet channel and play water channel are linked together, stagnant water mechanism closes the time inlet channel and play water channel are cut off mutually, play water control valve still includes buoyancy mechanism, link mechanism and stop gear, buoyancy mechanism passes through link mechanism control stagnant water mechanism opens or closes, stop gear has spacing position and position of stepping down, stop gear is in can with buoyancy mechanism restriction in the low position when spacing position is in, stop gear moves to when outside actuating mechanism's drive moves down to the position of stepping down in order to remove the restriction to buoyancy mechanism, buoyancy mechanism lifts up and passes through link mechanism opens stagnant water mechanism, link mechanism includes the activity respectively locates the connecting rod and lifting lever of valve body, lifting lever with still be equipped with reset piece between the valve body, respectively with buoyancy mechanism with lifting lever and the cooperation when lifting the link mechanism can be in the position when lifting the lifting lever and the landing rod is closed down by the landing down the floating lever.

Preferably, the connecting rod is rotatably or slidably arranged on the valve body, and one end of the connecting rod is movably connected with the buoyancy mechanism.

Preferably, the connecting rod is connected with the buoyancy mechanism, the limiting mechanism is matched with the connecting rod, and the limiting mechanism limits or releases the limiting of the buoyancy mechanism through the connecting rod.

Preferably, a limiting step surface is arranged at one end, connected with the buoyancy mechanism, of the connecting rod, and the limiting step surface is matched with the limiting mechanism.

Preferably, the other end of the connecting rod is pivoted with the valve body, and an abutting surface which is in abutting fit with the lifting rod is arranged between the two ends of the connecting rod.

Preferably, the lifting rod is rotatably arranged on the valve body.

Preferably, the reset piece is an elastic piece or a magnetic piece or a weight piece.

Preferably, the limiting mechanism comprises a limiting swing rod rotatably arranged on the valve body, one end of the limiting swing rod is matched with the buoyancy mechanism, and the other end of the limiting swing rod is used for being matched with the external driving mechanism.

Preferably, the buoyancy mechanism comprises a floating barrel and a screw rod in threaded connection with the floating barrel, the top end of the screw rod is movably connected with the connecting rod, and the floating barrel floats up and down along the valve body.

Preferably, the water stopping mechanism is a back pressure type water stopping mechanism, the back pressure type water stopping mechanism comprises a valve port communicated with the water inlet channel and the water outlet channel and a water stopping pad matched with the valve port, one side of the water stopping pad, deviating from the valve port, is provided with a back pressure cavity, the back pressure cavity is provided with a pressure relief hole, the pressure relief hole is opened or closed to realize the opening or closing of the back pressure type water stopping mechanism, the water stopping pad is opened under the action of the water pressure of the water inlet channel when the pressure relief hole is opened, the water stopping pad is closed under the action of the back pressure cavity when the pressure relief hole is closed, and the lifting rod is provided with a pressure relief part matched with the opening and closing of the pressure relief hole.

In addition, the utility model also provides a flushing device of the toilet water tank, which comprises the toilet water tank, a drainage valve arranged in the toilet water tank to control the drainage of the toilet water tank, and a water outlet control valve of any one of the above, wherein the drainage valve is matched with the limiting mechanism, when the drainage valve is opened, the limiting mechanism is driven to move from the limiting position to the yielding position, and the drainage valve is the external driving mechanism.

The beneficial effects of the utility model are as follows:

the utility model relates to a water outlet control valve, which is mainly an improvement on a connecting rod mechanism, and specifically comprises a connecting rod and a lifting rod which are respectively movably arranged on a valve body, wherein a reset piece is arranged between the lifting rod and the valve body, the connecting rod is respectively matched with a buoyancy mechanism and the lifting rod, the lifting rod is matched with a water stopping mechanism, the lifting rod is driven by the connecting rod to open the water stopping mechanism when the buoyancy mechanism floats, the connecting rod is driven by the buoyancy mechanism to separate from the lifting rod when the buoyancy mechanism falls, and the lifting rod can be reset to a position for closing the water stopping mechanism under the action of the reset piece.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of an embodiment of the present utility model wherein a water outlet control valve and a drain valve are assembled together (the spacing mechanism is in a spacing position, the buoyancy mechanism is in a spacing state by the spacing mechanism);

FIG. 2 is a cross-sectional view of the outlet control valve in the state of FIG. 1;

FIG. 3 is a perspective view of an embodiment of the present utility model in which a water outlet control valve and a drain valve are assembled together (the position limiting mechanism is in a position of yielding, the position limiting mechanism is in a state of yielding to the buoyancy mechanism);

FIG. 4 is a cross-sectional view of the outlet control valve in the state of FIG. 3;

FIG. 5 is a cross-sectional view of FIG. 3;

FIG. 6 is a perspective view of a water outlet control valve according to an embodiment of the present utility model;

FIG. 7 is a perspective view of a drain valve with a water outlet control valve according to an embodiment of the present utility model;

FIG. 8 is a perspective view of a limit rocker according to an embodiment of the present utility model;

FIG. 9 is a perspective view of a connecting rod according to an embodiment of the present utility model;

fig. 10 is a perspective view of a lifter bar according to an embodiment of the present utility model.

Symbol description:

1, a water outlet control valve; 10 valve body; 11 water inlet channels; 12 water outlet channels; 20 back pressure type water stopping mechanism; 21 pressure relief holes; a 30 buoyancy mechanism; 31 float barrels; 32 screw rods; 40 linkage mechanism; a 41 connecting rod; 411 limit step surfaces; 412 abutment surfaces; 42 lifting the rod; 421 gaskets; 50 limit mechanisms (limit swing rods); 60 resetting pieces;

2, draining valve; 201 a central tube; 2011 boss.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

In the description of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

As shown in fig. 1 to 10, in an embodiment of the present utility model, a water outlet control valve 1 based on buoyancy control is installed in a water tank (not shown), the water outlet control valve 1 controls water outlet or water stop based on buoyancy change caused by water level change of the water tank, specifically, the water outlet control valve 1 is in a water stop state when the buoyancy mechanism is limited in a low position under the condition that the buoyancy mechanism has buoyancy, and the water outlet control valve 1 is controlled to outlet water after the buoyancy mechanism is released from the limit.

The water outlet control valve 1 comprises a valve body 10 with a water inlet channel 11 and a water outlet channel 12 and a water stopping mechanism arranged on the valve body 10 and used for controlling the water inlet channel 11 and the water outlet channel 12 to be communicated or cut off in a tangential mode. When the water stopping mechanism is opened, the water inlet channel 11 is communicated with the water outlet channel 12, and when the water stopping mechanism is closed, the water inlet channel 11 is cut off from the water outlet channel 12. Specifically, the water stopping mechanism of this embodiment is a back pressure type water stopping mechanism 20, the back pressure type water stopping mechanism 20 includes a valve port (not shown) communicating the water inlet channel 11 and the water outlet channel 12, a water stopping pad (not shown) matched with the valve port, one side of the water stopping pad away from the valve port is provided with a back pressure cavity (not shown), the back pressure cavity is provided with a pressure relief hole 21, the back pressure cavity is opened or closed by opening or closing the pressure relief hole 21 to realize the opening or closing of the back pressure type water stopping mechanism 20, the water stopping pad opens the valve port under the action of the water pressure of the water inlet channel 11 when the pressure relief hole 21 is opened, and the water stopping pad closes the valve port under the action of the back pressure cavity when the pressure relief hole 21 is closed. The back pressure type water stopping mechanism 20 is a back pressure type water stopping mechanism commonly used on a water inlet valve of a conventional toilet cistern, and the other specific structures and working principles thereof are not explained in detail here. Of course, the water stopping mechanism may be a piston type water stopping mechanism or other water stopping mechanism commonly used on the water inlet valve of the existing toilet cistern, and the specific structure of the water stopping mechanism is not limited.

The water outlet control valve 1 further comprises a buoyancy mechanism 30, a link mechanism 40 and a limiting mechanism 50, wherein the buoyancy mechanism 30 controls the water stopping mechanism to be opened or closed through the link mechanism 40. The limiting mechanism 50 has a limiting position and a yielding position, referring to fig. 1 and 2, when the limiting mechanism 50 is in the limiting position, the buoyancy mechanism 30 can be limited to a low position, and when the buoyancy mechanism 30 is in the low position, the link mechanism 40 controls to close the pressure release hole 21 (i.e. close the water stop mechanism), so that the water inlet channel 11 and the water outlet channel 12 of the water outlet control valve 1 are not communicated, and the water outlet control valve 1 is in a water stop state. Referring to fig. 3 and 4, when the limiting mechanism 50 is driven by the external driving mechanism to move to the yielding position to release the restriction on the buoyancy mechanism 30, the buoyancy mechanism 30 floats and opens the pressure release hole 21 (i.e., opens the water stop mechanism) through the link mechanism 40, so that the water inlet channel 11 and the water outlet channel 12 of the water outlet control valve 1 are communicated, and the water outlet control valve 1 is in a water outlet state.

The link mechanism 40 includes a link 41 and a lifting rod 42 movably disposed on the valve body 10, a reset member 60 is disposed between the lifting rod 42 and the valve body 10, the link 41 is respectively matched with the buoyancy mechanism 30 and the lifting rod 42, and the lifting rod 42 is matched with the water stopping mechanism. When the buoyancy mechanism 30 floats, the lifting rod 42 is driven by the connecting rod 41 to open the water stopping mechanism, when the buoyancy mechanism 30 falls, the connecting rod 41 is driven to separate the connecting rod 41 from the lifting rod 42, so that a linkage idle stroke exists between the connecting rod 41 and the lifting rod 42, and the lifting rod 42 can be reset to a position for closing the water stopping mechanism under the action of the reset piece 60. The lifting rod 42 is provided with a pressure relief part which is matched with the pressure relief hole 21 in an opening and closing manner, and preferably, the pressure relief part is provided with a sealing pad 421, and the sealing pad 421 is matched with the pressure relief hole 21.

In this embodiment, the restoring member 60 is an elastic member, specifically a compression spring, although the specific elastic structure is not limited, and may be a tension spring or a spring plate. In other embodiments, the restoring member 60 may be replaced by a magnetic member or a weight member, etc., and restoring by magnetic force or gravity is also possible.

In this embodiment, the connecting rod 41 is rotatably disposed on the valve body 10, and one end of the connecting rod 41 is movably connected with the buoyancy mechanism 30. Of course, in other embodiments, the connecting rod 41 may be slidably disposed on the valve body 10.

In this embodiment, the limiting mechanism 50 is matched with the connecting rod 41, and the buoyancy mechanism 30 is limited or released by the connecting rod 41. Preferably, a limiting step surface 411 is arranged at one end of the connecting rod 41 connected with the buoyancy mechanism 30, and the limiting step surface 411 is matched with the limiting mechanism 50.

In this embodiment, the other end of the connecting rod 41 is pivoted to the valve body 10, and an abutment surface 412 that is in abutment engagement with the lifting lever 42 is provided between the two ends of the connecting rod 41. The lifting rod 42 is rotatably provided on the valve body 10.

In this embodiment, the limiting mechanism 50 includes a limiting swing rod 50 rotatably disposed on the valve body 10, and one end (a first end) of the limiting swing rod 50 is matched with the buoyancy mechanism 30, and the other end (a second end) is used for being matched with an external driving mechanism. The limiting swing rod 50 rotates around the rotating shaft between the two ends of the limiting swing rod, and the gravity moment of the part, close to the first end, of the rotating shaft on the limiting swing rod 50 is smaller than that of the part, close to the second end, of the rotating shaft on the limiting swing rod 50, namely, after the driving force of the external driving mechanism is removed, the limiting swing rod 50 can swing and reset to the limiting position under the action of self gravity. Of course, in other embodiments, the limit swing rod 50 may also use a restoring force with different forms, such as an elastic force or a magnetic force, etc., and it is understood that the elastic force is provided by an elastic member and the magnetic force is provided by a magnetic member.

In this embodiment, the buoyancy mechanism 30 includes a float 31 and a screw 32 screwed to the float 31, the top end of the screw 32 is movably connected to a connecting rod 41, and the float 31 floats up and down along the valve body 10.

The utility model also provides a flushing device of a toilet water tank, which comprises a toilet water tank (not shown), a drain valve 2 arranged in the toilet water tank to control the drainage of the toilet water tank, and a water outlet control valve 1 of any one of the above. The drain valve 2 is matched with the limit mechanism 50, when the drain valve 2 is opened, the limit mechanism 50 is driven to move from the limit position to the abdication position, and the drain valve 2 is an external driving mechanism.

The flushing device of the toilet tank further includes a drain pipe (not shown) communicating the drain valve 2 with the bowl of the toilet, the water inlet passage 11 of the outlet control valve 1 is communicated with a pressurized water supply source (e.g., a municipal tap water pipe), and water from the water outlet passage 12 of the outlet control valve 1 flows to the bowl of the toilet through the drain pipe.

Preferably, the water outlet control valve 1 and the water outlet valve 2 are assembled into an integrated structure, and the two are better in detachable connection.

The specific working process is briefly described as follows:

referring to fig. 1 and 2, at this time, the drain valve 2 is in a closed state, the toilet tank is in an unreleased state, the limit swing lever 50 is in a limit position, and the buoyancy mechanism 30 is limited in a low position by the limit swing lever 50 and cannot float in place. At this time, the link 41 is separated from the lift lever 42 by the buoyancy mechanism 30, and a link idle stroke is provided between the link 41 and the lift lever 42. The lifting rod 42 is in a position for closing the pressure relief hole 21 under the action of the reset piece 60, so that the water inlet channel 11 and the water outlet channel 12 of the water outlet control valve 1 are not communicated, and the water outlet control valve 1 is in a water stopping state.

Referring to fig. 3 and 4, when the drain valve 2 is opened, the water level in the toilet tank starts to drop, and at the same time, the limit swing rod 50 swings out under the abutting drive of the boss 2011 provided on the central tube 201 of the drain valve 2 to release the restriction on the buoyancy mechanism 30, the buoyancy mechanism 30 floats and drives the connecting rod 41 to move to a linkage idle stroke and then abuts against the lifting rod 42, so as to drive the lifting rod 42 to open the pressure relief hole 21, so that the water inlet channel 11 and the water outlet channel 12 of the water outlet control valve 1 are communicated, and the water outlet control valve 1 is in a water outlet state. That is, after the drain valve 2 is opened to drain water, the water outlet control valve 1 also outputs water, and the water outlet of the water outlet control valve 1 has a certain pressure, so that the water discharged by the drain valve 2 can be assisted, and the flushing effect on the urinal is better.

When the water level in the toilet tank drops to a preset height, the buoyancy of the floating barrel 31 disappears or is insufficient to drop, the floating barrel 31 drives the connecting rod 41 to swing through the screw rod 32, so that the connecting rod 41 is separated from the lifting rod 42 again, a linkage idle stroke is formed between the connecting rod 41 and the lifting rod 42 again, the lifting rod 42 is located at a position for closing the pressure relief hole 21 again under the action of the reset piece 60, and therefore the water inlet channel 11 and the water outlet channel 12 of the water outlet control valve 1 are not communicated, and the water outlet control valve 1 is located in a water stopping state again. When the connecting rod 41 swings to the position where the limiting step surface 411 is located below the end (i.e. the first end of the limiting swing rod 50) where the limiting swing rod 50 is matched with the connecting rod, the limiting swing rod 50 can swing and reset under the action of self gravity (elastic force or magnetic force or other reset force can be adopted), so that the first end of the limiting swing rod 50 is located above the limiting step surface 411 again, and in this way, when the toilet tank is refilled with water, the buoyancy mechanism 30 is in a process of being lifted again, the first end of the limiting swing rod 50 is abutted against the limiting step surface 411 of the connecting rod 41 to limit the buoyancy mechanism 30 at a low position, and the water outlet control valve 1 is restored to the initial state as shown in fig. 1 and 2.

The flushing device of the toilet water tank of the embodiment, when the water discharge valve 2 discharges water in the toilet water tank, the water discharge valve 2 is also linked with the limit swing rod 50, so that the water outlet control valve 1 is controlled to be opened, the water outlet of the water outlet control valve 1 has a certain pressure, the water discharged by the water discharge valve 2 can be assisted, the flushing effect on a urinal is better, the water outlet control valve 1 is combined with the water discharge valve 2, and the flushing device is simple in structure and reliable in control.

Of course, the water outlet control valve 1 of the present utility model can be used in other technical fields of application, and the use environment is not limited, besides the flushing device of the toilet tank in the technical field of bathroom.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides a play water control valve based on buoyancy control, includes the valve body that has inlet channel and play water channel and locates on the valve body in order to be used for controlling inlet channel and play water channel are linked together or tangent the stagnant water mechanism of breaking off, when stagnant water mechanism opens inlet channel and play water channel are linked together, stagnant water mechanism closes the time inlet channel and play water channel are cut off mutually, play water control valve still includes buoyancy mechanism, link mechanism and stop gear, buoyancy mechanism passes through link mechanism control stagnant water mechanism opens or closes, stop gear has spacing position and position of stepping down, stop gear is in can with buoyancy mechanism restriction in the low position when spacing position is in, stop gear moves to under outside actuating mechanism's drive when stepping down the position in order to relieve the restriction to buoyancy mechanism, buoyancy mechanism lifts up and passes through link mechanism opens stagnant water mechanism, its characterized in that link mechanism includes the movable setting respectively link and the pole of valve body, lift up the pole with still be equipped with reset piece between the link mechanism control the stagnant water mechanism opens or closes with the reset piece when lifting up the link mechanism and lifting down the link mechanism and the reset piece is in the cooperation when the buoyancy mechanism is closed down.

2. The water outlet control valve according to claim 1, wherein the connecting rod is rotatably or slidably disposed on the valve body, and one end of the connecting rod is movably connected with the buoyancy mechanism.

3. The outlet control valve of claim 1, wherein the link is connected to the buoyancy mechanism, and the limiting mechanism is engaged with the link and limits or releases the limit of the buoyancy mechanism via the link.

4. A water outlet control valve according to claim 3, wherein a limit step surface is provided at an end of the connecting rod connected to the buoyancy mechanism, the limit step surface being engaged with the limit mechanism.

5. The water outlet control valve according to claim 2, wherein the other end of the connecting rod is pivoted with the valve body, and an abutting surface which is in abutting fit with the lifting rod is arranged between the two ends of the connecting rod.

6. The outlet control valve of claim 1, wherein the return member is an elastic member or a magnetic member or a weight member.

7. The outlet control valve of claim 1 wherein the limit mechanism comprises a limit rocker rotatably disposed on the valve body, one end of the limit rocker being engaged with the buoyancy mechanism and the other end being engaged with the external drive mechanism.

8. The water outlet control valve according to claim 1, wherein the buoyancy mechanism comprises a float bowl and a screw rod in threaded connection with the float bowl, the top end of the screw rod is movably connected with the connecting rod, and the float bowl floats up and down along the valve body; the lifting rod is rotatably arranged on the valve body.

9. The water outlet control valve according to any one of claims 1 to 8, wherein the water stopping mechanism is a back pressure type water stopping mechanism, the back pressure type water stopping mechanism comprises a valve port communicated with the water inlet channel and the water outlet channel, a water stopping pad matched with the valve port, a back pressure cavity is arranged on one side of the water stopping pad, which is away from the valve port, a pressure relief hole is arranged on the back pressure cavity, the back pressure type water stopping mechanism is opened or closed by opening or closing the pressure relief hole, the water stopping pad is opened by the water pressure of the water inlet channel when the pressure relief hole is opened, the water stopping pad is closed by the back pressure of the back pressure cavity when the pressure relief hole is closed, and a pressure relief part matched with the pressure relief hole is arranged on the lifting rod.

10. The flushing device for the toilet water tank comprises a toilet water tank and a drainage valve arranged in the toilet water tank to control drainage of the toilet water tank, and is characterized by further comprising a water outlet control valve according to any one of claims 1 to 9, wherein the drainage valve is matched with the limiting mechanism, and when the drainage valve is opened, the limiting mechanism is driven to move from the limiting position to the yielding position, and the drainage valve is the external driving mechanism.

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