CN217150510U

CN217150510U - Hydraulic drainage valve

Info

Publication number: CN217150510U
Application number: CN202220629770.2U
Authority: CN
Inventors: 陈雪瑜
Original assignee: Guli Xiamen Technology Co Ltd
Current assignee: Guli Xiamen Technology Co Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-08-09
Anticipated expiration: 2032-03-21

Abstract

The utility model discloses a hydraulic pressure drain valve, include: a valve body provided with a water outlet; a valve element provided in the valve body to open and close the drain port; the hydraulic driving mechanism comprises a hydraulic cylinder and a piston which is matched with the hydraulic cylinder and can move between a first position and a second position, the piston is in linkage fit with the valve core, and the piston is driven by hydraulic pressure in the hydraulic cylinder to move from the first position to the second position to drive the valve core to open the water outlet; the unhooking mechanism is provided with a connecting state and an unhooking state, the piston and the valve core can be in transmission connection when the unhooking mechanism is in the connecting state, the transmission connection between the piston and the valve core is disconnected when the unhooking mechanism is in the unhooking state, and the unhooking mechanism is disconnected in a sliding mode from the connecting state and is in the unhooking state when the piston moves to the second position; the floating mechanism is controlled by the water level in the water tank, and the floating mechanism in a floating state can support the valve core when the piston moves to the second position until the valve core is released when the piston is in a falling state along with the falling of the water level of the water tank.

Description

Hydraulic drainage valve

Technical Field

The utility model belongs to the technical field of bathroom technique and specifically relates to a hydraulic pressure drain valve for controlling closestool water tank drainage.

Background

The existing hydraulic drainage valve for controlling the drainage of a toilet water tank usually utilizes the water pressure of tap water to drive a piston in a hydraulic cylinder to work, and the piston further drives the drainage valve to open for drainage. Specifically, when tap water flows into the hydraulic cylinder, a piston in the hydraulic cylinder is driven, and the sliding of the piston drives the drain valve to open; when the water supply to the hydraulic cylinder is stopped, the piston is gradually returned as the water in the hydraulic cylinder gradually flows out from the drain portion, and the drain valve is closed. In the structure, the closing of the drain valve is influenced by the resetting of the piston, so that a certain time is needed for the closing of the drain valve, and water entering the water tank in the closing process of the drain valve is discharged and wasted, so that the problem of water resource waste is solved.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve above-mentioned technical problem, provide the hydraulic pressure drain valve, it can make closing of hydraulic pressure drain valve not receive hydraulic drive mechanism's influence, and the closing process is rapid, and then can avoid closing the waste of in-process water resource.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a hydraulic drain valve mounted in a tank, comprising:

a valve body provided with a water outlet;

a valve element movably arranged in the valve body to open and close the water outlet;

the hydraulic driving mechanism comprises a hydraulic cylinder and a piston which is matched with the hydraulic cylinder and can move between a first position and a second position, the piston is in linkage fit with the valve core, and the piston is driven by the hydraulic pressure in the hydraulic cylinder to move from the first position to the second position to drive the valve core to open the water outlet;

the unhooking mechanism is provided with a connecting state and an unhooking state, the piston and the valve core can be in transmission connection when the unhooking mechanism is in the connecting state, the transmission connection between the piston and the valve core is disconnected when the unhooking mechanism is in the unhooking state, and when the piston moves to the second position, the unhooking mechanism is in the unhooking state due to the fact that the connecting state is disconnected in a sliding mode;

and the buoyancy mechanism is controlled by the water level in the water tank to be in a floating state or a falling state, and the buoyancy mechanism in the floating state can support the valve core when the piston moves to the second position until the valve core is released when the piston is in the falling state along with the falling of the water level in the water tank.

In a preferred embodiment, the unhooking mechanism includes a slider and a hooking portion, the slider is slidably disposed on one of the piston and the valve element, the hooking portion is disposed on the other of the piston and the valve element, the unhooking mechanism is in the connection state when the slider and the hooking portion are hooked, and the slider and the hooking portion are separated from each other to be in the unhooking state when the piston moves to the second position.

In a preferred embodiment, the valve body or the hydraulic cylinder is provided with an abutting portion, and when the piston moves to the second position, the slider abuts against and cooperates with the abutting portion, so that the slider is driven by the abutting portion to be separated from the hook portion.

In a preferred embodiment, the abutting portion is provided with a first inclined surface, and/or the slider is provided with a second inclined surface, and the slider slides to a position separated from the hook portion under the action of the first inclined surface and/or the second inclined surface when contacting the abutting portion.

In a preferred embodiment, the unhooking mechanism further includes a slider resetting elastic element for resetting the slider, and in the process that the piston moves from the second position to the first position, after the slider is separated from the abutting portion, the slider resetting elastic element drives the slider to reset so as to be capable of being hooked with the hooking portion.

In a preferred embodiment, the hydraulic driving mechanism further comprises a piston return elastic member arranged between the hydraulic cylinder and the piston, and the piston return elastic member is used for driving the piston to move from the second position to the first position when the water supply to the hydraulic cylinder is stopped.

In a preferred embodiment, the valve core comprises a sealing disc and a valve rod, the sealing disc is fixed at the bottom end of the valve rod, the sealing disc is used for opening and closing the water outlet, the piston comprises a piston head and a piston rod, the piston head is arranged in the hydraulic cylinder to divide an inner cavity of the hydraulic cylinder into a pressure cavity and a back pressure cavity, the pressure cavity is communicated with an external pressure water source, the back pressure cavity is communicated with external air, and the piston rod penetrates out of the hydraulic cylinder to be matched with the valve rod.

In a preferred embodiment, the unhooking mechanism further includes a sliding seat, the sliding seat is fixed at the bottom end of the piston rod or at the top end of the valve rod, and the sliding block is slidably disposed on the sliding seat.

In a preferred embodiment, the sliding seat is disposed at a bottom end of the piston rod, the hooking portion is a hooking arm extending upward from a top end of the valve rod, a hooking hole is formed in the hooking arm, the unhooking mechanism is in a connected state when one end of the sliding block is clamped into the hooking hole, and the unhooking mechanism is in an unhooking state when one end of the sliding block exits the hooking hole.

In a preferred embodiment, the buoyancy mechanism includes floating bucket and swinging arms, the swinging arms rotate the dress to connect in the valve body, the floating bucket receives the control of water level is in order to be in the floating state or the whereabouts state in the water tank, the floating bucket drives through floating and whereabouts action the swinging arms is at the support position and the swing between the position of stepping down, the swinging arms is located can during the support position with brace table looks butt on the case, the swinging arms is located during the position of stepping down can with brace table phase separation on the case.

In a preferred embodiment, the valve body comprises a main body and a valve cover covering the top end of the main body, and the hydraulic cylinder is arranged on the valve cover and positioned above the valve core.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses a set up unhook mechanism and buoyancy mechanism on hydraulic drain valve, unhook mechanism can drive when the state is being linked and connect piston and case, when the piston moves to the second position, unhook mechanism is in the unhook state and breaks off the drive connection between piston and the case, and the case is supported by buoyancy mechanism and makes the case can continuously open the outlet for a period of time to ensure that drainage time is enough at this moment, the buoyancy mechanism releases the control to the case when buoyancy mechanism falls and is in the whereabouts state along with the water level of the water tank so that the case can fall and close the outlet to finish the drainage, thereby can make the closing of case not influenced by hydraulic drive mechanism, and because behind the water level of the water tank, buoyancy mechanism can fall in time, thereby make the case also can fall in time after the drainage is finished, also, namely, hydraulic drain valve can in time close after the water of water tank is discharged, the closing process is rapid, the problem that water resources are wasted in the closing process due to the fact that water newly supplemented by the water tank flows away when the existing hydraulic drain valve is closed slowly is avoided.

2. The unhooking mechanism adopts a sliding structure for switching from a connecting state to an unhooking state, and has the advantages of simple and reliable structure and easy realization.

3. The unhooking mechanism comprises a sliding block and a hooking part which are mutually hooked, the sliding block can be slidably arranged on one of the piston and the valve core, the hooking part is arranged on the other of the piston and the valve core, and when the piston moves to the second position, the sliding block is separated from the hooking part, so that the unhooking mechanism is simple in structure and reliable in function.

4. Through set up butt portion on valve body or pneumatic cylinder, when the piston activity was to the second position, slider and butt portion butt cooperation, butt portion drive slider slides and with collude the card portion and separate, the gliding simple structure of drive slider, reliable.

Drawings

Fig. 1 is an exploded perspective view of a hydraulic drain valve according to an embodiment of the present invention;

fig. 2 is one of the cross-sectional views of a hydraulic drain valve according to an embodiment of the present invention when water is just supplied to the hydraulic cylinder (when the piston is in the first position and the unhooking mechanism is in the coupled state);

fig. 3 is a second cross-sectional view of the hydraulic drain valve of an embodiment of the present invention in a state immediately after water is supplied to the hydraulic cylinder (when the piston is in the first position and the unhooking mechanism is in the coupled state);

FIG. 4 is an enlarged view at A in FIG. 3;

fig. 5 is a cross-sectional view of a hydraulic drain valve according to an embodiment of the present invention just before the slider is removed from the locking hole;

FIG. 6 is an enlarged view at B in FIG. 5;

fig. 7 is a cross-sectional view of a hydraulic drain valve according to an embodiment of the present invention with the piston in a second position and the unhooking mechanism in an unhooked state;

FIG. 8 is an enlarged view at C in FIG. 7;

fig. 9 is an assembly view of a slider and a slide of a hydraulic drain valve according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view of FIG. 9;

fig. 11 is a perspective view of a slider of a hydraulic drain valve according to an embodiment of the present invention;

fig. 12 is a perspective view of a bottom cover of a hydraulic cylinder of a hydraulic drain valve according to an embodiment of the present invention;

fig. 13 is a perspective view of a valve element of a hydraulic drain valve according to an embodiment of the present invention;

fig. 14 is a perspective view of a float mechanism of a hydraulic drain valve according to an embodiment of the present invention.

The symbols are as follows:

10-a valve body; 10 a-a body; 10 b-valve cover; 11-a water outlet;

20-a valve core; 21-sealing disc; 22-a valve stem; 221-a card arm; 2211-card hole; 222-a support table;

30-a hydraulic drive mechanism; 31-a hydraulic cylinder; 31 a-pressure chamber; 31 b-a back pressure chamber; 311-an abutment; 3111-a first bevel; 312-cylinder block; 313-a bottom cover; 3131-a through-flow aperture; 3132-perforating; 32-a piston; 321-a piston head; 322-a piston rod; 33-piston return spring; 34-a water inlet pipe;

40-unhooking mechanism; 41-a slide block; 411-a second bevel; 42-hook part; 43-slide block return spring; 44-a slide;

50-a buoyancy mechanism; 51-a floating barrel; 52-Oscillating Lever.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples; however, the toilet flushing system with the flow increasing device of the present invention is not limited to the embodiment.

Referring to fig. 1 to 14, a hydraulic drain valve according to an embodiment of the present invention is installed in a water tank for controlling drainage of the water tank or stopping drainage, and includes:

a valve body 10 provided with a water discharge port 11;

a valve body 20 movably provided in the valve body 10 to open and close the drain port 11;

the hydraulic driving mechanism 30 comprises a hydraulic cylinder 31 and a piston 32 which is matched with the hydraulic cylinder 31 and can move between a first position and a second position, the piston 32 is matched with the valve core 20 in a linkage manner, the piston 32 is driven by hydraulic pressure in the hydraulic cylinder 31 to move from the first position to the second position to drive the valve core 20 to open the water outlet 11, namely, when the piston 32 is at the first position, the valve core 20 closes the water outlet 11, and when the piston 32 is at the second position, the valve core 20 opens the water outlet 11 to realize water drainage;

a unhooking mechanism 40 having a connection state and a unhooking state, wherein the piston 32 and the valve core 20 can be connected in a transmission manner when the unhooking mechanism 40 is in the connection state, the transmission connection between the piston 32 and the valve core 20 is disconnected when the unhooking mechanism 40 is in the unhooking state, and when the piston 32 moves to the second position, the unhooking mechanism 40 is in the unhooking state by disconnecting the connection in a sliding manner from the connection state;

the buoyancy mechanism 50 is controlled by the water level in the tank to be in a floating state or a falling state, and the buoyancy mechanism 50 in the floating state can support the valve body 20 when the piston 32 moves to the second position until the valve body 20 is released in the falling state with the falling of the water level in the tank (i.e., the buoyancy mechanism 50 does not support the valve body 20 after falling, so that the valve body 20 can fall to close the drain port 11).

Specifically, the unhooking mechanism 40 includes a slider 41 and a hooking portion 42, which are hooked together, the slider 41 is slidably disposed on one of the piston 32 and the valve element 20, and the hooking portion 42 is disposed on the other of the piston 32 and the valve element 20. When the piston 32 is located at the first position, the slider 41 and the hooking part 42 are hooked, and the unhooking mechanism 40 is in a connected state so as to be capable of driving and connecting the piston 32 and the valve core 20; when the piston 32 moves to the second position, the slider 41 slides away and is separated from the hooking portion 42, and the unhooking mechanism 40 is in an unhooking state, so that the transmission connection between the piston 32 and the valve core 20 is disconnected.

In this embodiment, the hydraulic cylinder 31 is provided with an abutting portion 311 for driving the slider 41 to slide so as to be separated from the hooking portion 42. Specifically, when the piston 32 moves to the second position, the slider 41 is in contact engagement with the contact portion 311, and is driven by the contact portion 311 to be separated from the hook portion 42. Of course, in other embodiments, the abutting portion 311 may be alternatively provided on the valve body 10, as long as the abutting portion 311 can abut against the slider 41 and push the slider 41 to slide when the piston 32 moves to the second position.

In order to enable the slider 41 to be driven to slide when the abutting portion 311 abuts against the slider 41, a first inclined surface 3111 may be provided on the abutting portion 311, and/or a second inclined surface 411 may be provided on the slider 41, and the slider 41 may slide to a position separated from the hook portion 42 by the first inclined surface 3111 and/or the second inclined surface 411 when contacting the abutting portion 311. This embodiment specifically adopts a mode of providing the first slope 3111 and the second slope 411 at the same time, see fig. 4, 6 and 8.

In this embodiment, referring to fig. 1, 4, 6, 8 and 10, the unhooking mechanism 40 further includes a slider return elastic element 43 for returning the slider 41, and in the process that the piston 32 moves from the second position to the first position, after the slider 41 is separated from the abutting portion 311, the slider return elastic element 43 drives the slider 41 to return to be capable of being hooked with the hooking portion 42. The slide return elastic member 43 is specifically a compression spring, but may be any other elastic member.

In the present embodiment, referring to fig. 1, 2, 3, 5 and 7, the hydraulic driving mechanism 30 further includes a piston return elastic member 33 disposed between the hydraulic cylinder 31 and the piston 32, and the piston return elastic member 33 is configured to drive the piston 32 to move from the second position to the first position when the water supply to the hydraulic cylinder 31 is stopped.

In this embodiment, the valve body 20 includes a seal plate 21 and a valve stem 22, the seal plate 21 is fixed to a bottom end of the valve stem 22, the seal plate 21 is used for opening and closing the drain port 11, the piston 32 includes a piston head 321 and a piston rod 322, the piston head 321 is disposed in the hydraulic cylinder 31 to divide an inner cavity of the hydraulic cylinder 31 into a pressure chamber 31a and a back pressure chamber 31b, the pressure chamber 31a is communicated with an external pressure water source, the back pressure chamber 31b is communicated with outside air, and the piston rod 322 penetrates out of the hydraulic cylinder 31 to be matched with the valve stem 22. One end of the piston return elastic member 33 abuts against the hydraulic cylinder 31, and the other end abuts against the piston head 321.

In this embodiment, referring to fig. 4, 6, 8, 9 and 10, the unhooking mechanism 40 further includes a sliding seat 44, the sliding seat 44 is fixed at the bottom end of the piston rod 322 or the top end of the valve rod 22, and the sliding block 41 is slidably disposed on the sliding seat 44. The slider 44 may be integrally formed with the piston rod 322 or the stem 22 or may be separately formed and then fixedly connected together.

In this embodiment, the slide 44 is disposed at the bottom end of the piston rod 322, the hooking portion 42 is a hook arm 221 extending upward from the top end of the valve rod 22, a hook hole 2211 is disposed on the hook arm 221, when one end of the slider 41 is hooked into the hook hole 2211, the unhooking mechanism 40 is in a connected state, and when one end of the slider 41 exits the hook hole 2211, the unhooking mechanism 40 is in an unhooking state.

In this embodiment, referring to fig. 3, 5, 7 and 11, the buoyancy mechanism 50 includes a float barrel 51 and a swing lever 52, the swing lever 52 is rotatably installed in the valve body 10, the float barrel 51 is controlled by the water level in the water tank to be in a floating state or a falling state, the float barrel 51 drives the swing lever 52 to swing between a support position and a abdicating position through the floating and falling actions, the swing lever 52 can abut against a support platform 222 on the valve core 20 to support the lifted valve core 20 when being in the support position, the swing lever 52 can be separated from the support platform 222 on the valve core 20 to release the support of the valve core 20 when being in the abdicating position, so that the valve core 20 can continuously open the drain 11 for a period of time after being separated from the piston 32 to ensure that the drain time is sufficient, and, because the water level in the water tank falls behind, the buoyancy mechanism 50 can fall in time, so that the valve core 20 can also fall in time, that is, the hydraulic drain valve can be closed in time after the water in the water tank is discharged, and the phenomenon that the water tank is newly supplemented and enters water to flow away in vain in the process because the existing hydraulic drain valve is slow in closing process is avoided.

In this embodiment, the valve body 10 includes a main body 10a and a bonnet 10b covering the top end of the main body 10a, and the hydraulic cylinder 31 is disposed on the bonnet 10b and above the valve core 20. The hydraulic cylinder 31 includes a cylinder 312 and a bottom cover 313, the top end of the cylinder 312 is connected with the bottom surface of the valve cover 10b in a sealing manner, and the bottom cover 313 seals the opening at the bottom end of the cylinder 312. The bottom cap 313 is provided with a through hole 3131 and a through hole 3132, the through hole 3131 is communicated with an external pressure water source through the water inlet pipe 34, and the piston rod 322 passes through the through hole 3132. A drain hole (not shown) may be provided in the bottom cover 313 to drain the water in the pressure chamber 31a when the piston 32 is returned from the second position to the first position, but a drain gap may be optionally provided between the bottom cover 313 and the cylindrical cylinder 312 to drain the water in the pressure chamber 31a from the drain gap when the piston 32 is returned from the second position to the first position.

The following briefly describes the operation process of the present embodiment:

referring to fig. 2 to 4, at this time, the hydraulic drain valve is in a non-draining state, the piston 32 is in the first position, the unhooking mechanism 40 is in a coupled state, and one end of the slider 41 of the unhooking mechanism 40 is snapped into the snap hole 2211 of the snap arm 221 on the valve stem 22, so that the piston 32 can be drivingly connected to the valve core 20 through the unhooking mechanism 40. The valve body 20 is in a position to fall and close the drain port 11.

Referring to fig. 5 and 6, at this time, the external pressure water source is opened to pass water, water flows into the hydraulic cylinder 31 of the hydraulic driving mechanism 30 through the water inlet pipe 34 and the through hole 3131, the hydraulic pressure in the hydraulic cylinder 31 drives the piston 32 to move upward, the piston 32 further drives the valve core 20 to move upward to open the water outlet 11 for water drainage, at this time, the slider 41 of the unhooking mechanism 40 is not yet in contact with the abutting portion 311 on the hydraulic cylinder 31, and the unhooking mechanism 40 is still in a connected state.

Referring to fig. 7 and 8, at this time, after the piston 32 moves further upward in the state of fig. 5 and 6, the slider 41 of the unhooking mechanism 40 contacts the abutting portion 311 of the hydraulic cylinder 31, so that under the action of the first inclined surface 3111 on the abutting portion 311 and the second inclined surface 411 on which the slider 41 is connected, the slider 41 slides leftward to be separated from the card hole 2211 of the card arm 221, that is, the unhooking mechanism 40 is in the unhooking state, so that the unhooking mechanism 40 cannot continuously transmit and connect the piston 32 and the valve core 20, and the valve core 20 falls for a short period and is supported by the swing rod 52 of the floating mechanism 50 in the floating state (the swing rod 52 abuts against the support table 522), so that the valve core 20 does not immediately fall to close the drain port 11, and the open state can be continuously maintained to ensure sufficient drainage time.

When the water level in the water tank continuously falls to a preset height, the buoyancy of the floating barrel 51 is not enough to continuously support the valve core 20, the floating barrel 51 falls, so that the swinging rod 52 is driven to swing and separate from the support table 522, the swinging rod 52 releases the limit on the valve core 20, the valve core 20 can immediately fall to close the water outlet 11, the water tank drainage is finished, the valve core 20 can timely close the water outlet, and the problem of water resource waste caused by long time for closing the water outlet after the water tank drainage is finished in the prior art is solved.

Compared with the prior art, the utility model has the advantages that the unhooking mechanism and the buoyancy mechanism are arranged on the hydraulic drain valve, the unhooking mechanism can be used for driving and connecting the piston and the valve core when in the connection state, when the piston moves to the second position, the unhooking mechanism is in the unhooking state and breaks the driving and connecting between the piston and the valve core, and the valve core is supported by the buoyancy mechanism to ensure that the valve core can continuously open the water outlet for a period of time and the enough water drainage time is ensured, the control on the valve core is released until the buoyancy mechanism falls along with the water level of the water tank and is in the falling state, so that the valve core can fall down and close the water outlet to finish the water drainage, thereby the valve core can be closed without being influenced by the hydraulic driving mechanism, and the buoyancy mechanism can fall down in time due to the falling of the water level of the water tank, thereby the valve core can also fall down in time after the water drainage is finished, that is, the hydraulic drain valve can be closed in time after the water of the water tank is discharged, the closing process is rapid, and the problem that water newly supplemented by the water tank flows away in a white manner due to the fact that the closing process of the existing hydraulic drain valve is slow is avoided, and then water resources are wasted in the closing process.

The above embodiments are only used to further illustrate the toilet flushing system with a flow increasing device of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification of the technical entity of the present invention to the above embodiments all fall into the protection scope of the technical solution of the present invention.

Claims

1. A hydraulic drain valve, installed in a water tank, comprising:

a valve body provided with a water outlet;

2. The hydraulic drain valve according to claim 1, wherein the unhooking mechanism includes a slider and an unhooking portion, the slider is slidably disposed on one of the piston and the valve element, the unhooking portion is disposed on the other of the piston and the valve element, the unhooking mechanism is in the coupled state when the slider and the unhooking portion are hooked, and the slider and the unhooking portion are separated from each other to be in the unhooking state when the piston moves to the second position.

3. A hydraulic drain valve according to claim 2, characterised in that the valve body or the hydraulic cylinder is provided with an abutment, and when the piston is moved to the second position, the slider is in abutment engagement with the abutment, so that it is driven by the abutment to separate from the hook.

4. The hydraulic drain valve according to claim 3, characterized in that the abutment is provided with a first inclined surface and/or the slider is provided with a second inclined surface, and the slider slides to a position separated from the hooking portion under the action of the first inclined surface and/or the second inclined surface when contacting the abutment.

5. The hydraulic drain valve according to claim 3, wherein the unhooking mechanism further comprises a slider resetting elastic member for resetting the slider, and in the process that the piston moves from the second position to the first position, the slider resetting elastic member drives the slider to reset so as to be capable of being hooked with the hooking portion after the slider is separated from the abutting portion.

6. The hydraulic drain valve of claim 1, wherein the hydraulic drive mechanism further comprises a piston return spring disposed between the hydraulic cylinder and the piston, the piston return spring being configured to drive the piston from the second position to the first position when water supply to the hydraulic cylinder is stopped.

7. The hydraulic drain valve according to claim 2, wherein the valve element comprises a sealing disc and a valve rod, the sealing disc is fixed at the bottom end of the valve rod, the sealing disc is used for opening and closing the drain port, the piston comprises a piston head and a piston rod, the piston head is arranged in the hydraulic cylinder to divide the inner cavity of the hydraulic cylinder into a pressure cavity and a back pressure cavity, the pressure cavity is communicated with an external pressure water source, the back pressure cavity is communicated with external air, and the piston rod penetrates out of the hydraulic cylinder to be matched with the valve rod.

8. The hydraulic drain valve according to claim 7, wherein the unhooking mechanism further comprises a sliding seat fixed at the bottom end of the piston rod or the top end of the valve rod, and the sliding block is slidably arranged on the sliding seat.

9. The hydraulic drain valve according to claim 8, wherein the slide seat is disposed at a bottom end of the piston rod, the hooking portion is a hook arm extending upward from a top end of the valve rod, a hook hole is formed in the hook arm, the unhooking mechanism is in a connected state when one end of the slider is hooked into the hook hole, and the unhooking mechanism is in an unhooking state when one end of the slider is withdrawn from the hook hole.

10. The hydraulic drain valve according to claim 1, wherein the floating mechanism includes a float barrel and a swing lever, the swing lever is rotatably mounted in the valve body, the float barrel is controlled by the water level in the water tank to be in a floating state or a falling state, the float barrel drives the swing lever to swing between a support position and a abdicating position through floating and falling actions, the swing lever is located at the support position and can abut against the support platform on the valve core, and the swing lever is located at the abdicating position and can be separated from the support platform on the valve core.

11. The hydraulic drain valve according to claim 1, wherein the valve body comprises a main body and a valve cover covering the top end of the main body, and the hydraulic cylinder is arranged on the valve cover and positioned above the valve core.