Hydraulic drive drainage mechanism, drainage device and hidden water tank

Abstract

The utility model discloses a hydraulic drive drainage mechanism, drainage device and hidden type water tank, the hydraulic drive drainage mechanism includes: a hydraulic drive module including a water inlet, a water outlet and a drain opening, the hydraulic drive module includes a movable part, when the movable part is in a first position, the water inlet is communicated with the water outlet, and when the movable part is in a second position, the water outlet is communicated with the drain opening; when the movable part is located at the second position, the water outlet is communicated with the drain opening; the hydraulic lifting module comprises a cylinder body, a piston and a pressure relief structure, the cylinder body is provided with a cavity, an external water source enters the cavity to drive the piston to ascend, and when the piston moves to a preset position, the cavity drains water and relieves pressure through the pressure relief structure. According to the hydraulic drive drainage mechanism, the pressure relief structure is arranged, so that internal pressure building can be effectively prevented; micro-stroke driving drainage is achieved, rapid drainage is achieved through the drainage opening, drainage is more stable and sensitive, and user experience is good.

Description

Technical Field

[0001] The utility model relates to the technical field of bathroom products, and in particular to a hydraulically driven drainage mechanism, a drainage device and a hidden water tank. Background Art

[0002] Existing water tank drain valves usually use mechanical or pneumatic lifting to drain water. The drain valve needs to have a certain stroke requirement for lifting and draining water, so the corresponding panel or button also needs to have a sufficient pressing stroke requirement. For example, increasing the lever to reduce the pressing stroke is likely to cause the pressing force value to be too large, affecting the pressing experience. There are also some hydraulically driven drainage structures that drive drainage through the pressure of the incoming water flow, but the hydraulic drive is usually not stable enough and cannot achieve fast drainage, making it impossible for the drainage-related components to be quickly reset, resulting in insufficient sensitivity of drainage.

[0003] In view of this, the inventor of the present application invented a hydraulically driven drainage mechanism, a drainage device and a hidden water tank. Utility Model Content

[0004] The utility model aims to provide a hydraulically driven drainage mechanism, a drainage device and a hidden water tank which can effectively prevent internal pressure build-up and make drainage more stable and reliable.

[0005] To achieve the above purpose, the utility model adopts the following technical solution: a hydraulically driven drainage mechanism, comprising:

[0006] A hydraulic drive module, comprising a water inlet, a water outlet and a water drain, wherein the water inlet is connected to an external pressure water source, and the hydraulic drive module comprises a movable part, wherein when the movable part is in a first position, the movable part opens the water outlet and closes the water drain, so that the water inlet is connected to the water outlet, and when the movable part is in a second position, the movable part closes the water inlet and opens the water drain, so that the water outlet is connected to the water drain;

[0007] The hydraulic lifting module includes a cylinder body, a piston and a pressure relief structure. The cylinder body is provided with a cavity connected to the water outlet. An external water source enters the cavity to drive the piston to rise. When the piston moves to a preset position, the cavity drains water and relieves pressure through the pressure relief structure.

[0008] Furthermore, the pressure relief structure includes an anti-pressure-holding channel connecting the cavity with the outside, and when the piston moves to a preset position, the cavity drains water and releases pressure through the anti-pressure-holding channel.

[0009] Furthermore, the piston is movably sleeved on the outer periphery of the cylinder body, a first sealing ring is provided on the outer wall of the cylinder body, the anti-pressure-holding channel is a concave structure provided on the inner wall of the piston, and when the piston rises to the point where the anti-pressure-holding channel corresponds to the first sealing ring, the anti-pressure-holding channel is connected to the cavity, and the first sealing ring is a Y-type, U-type or V-type sealing ring.

[0010] Furthermore, the pressure relief structure also includes a core shaft that cooperates with the opening and closing of the anti-pressure holding channel. When the piston moves to a preset position, the core shaft moves relative to the anti-pressure holding channel to open the anti-pressure holding channel.

[0011] Furthermore, the cylinder body is provided with an active cavity, and the piston is movably arranged up and down in the active cavity. The top wall of the active cavity is provided with a limiting protrusion corresponding to the core shaft. When the core shaft abuts against the limiting protrusion, the piston is driven to continue to rise to a preset position to disengage from the core shaft, so that the anti-pressure holding channel is opened.

[0012] Furthermore, a first return spring is provided between the top end of the core shaft and the piston, and a second return spring is provided between the piston and the top wall of the cylinder body.

[0013] Furthermore, the hydraulic driving module and the hydraulic lifting module are integrated and installed together, or the water outlet of the hydraulic driving module and the cylinder body of the hydraulic lifting module are connected by a hose.

[0014] Further, the hydraulic drive module includes a main body, the movable part is movably arranged in the main body, a back pressure chamber is arranged between the movable part and the main body, the main body is also provided with a pressure relief hole connected to the back pressure chamber, a back pressure pad and a driving rod cooperating with the pressure relief hole, when the driving rod drives the back pressure pad to open the pressure relief hole, the movable part moves to the first position, and when the back pressure pad and the driving rod are reset to close the pressure relief hole, the movable part moves to the second position.

[0015] A drainage device comprises the above-mentioned hydraulically driven drainage mechanism and a drainage valve, wherein the drainage valve comprises a starting member that can be driven to open a drainage port of the drainage valve, and the piston is drivingly connected to the starting member.

[0016] A hidden water tank comprises the above-mentioned drainage device. The water tank is also provided with a driving module, and the driving module is used to drive the movable part. The driving module is a mechanical switch or an electric control switch.

[0017] After adopting the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] The utility model discloses the hydraulically driven drainage mechanism can prevent internal pressure accumulation by setting a pressure relief structure. There is no drainage and pressure relief before the water pressure in the cavity exceeds a preset value. Even if the pressure of the external pressure water source is relatively small, the drainage piston lifting and drainage function can be realized. When the water pressure exceeds the preset value, the pressure is relieved through the pressure relief structure. Even if the pressure of the external pressure water source is large, the internal pressure will not be too large to cause pressure accumulation, thereby effectively ensuring the stable operation of the entire drainage mechanism and protecting the components at the same time. The drainage is driven by micro-stroke, and water is quickly discharged through the drain port. The drainage is more stable and sensitive, and the user experience is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a drainage device in Example 1 of the utility model;

[0020] Figure 2 This is a schematic diagram of a hydraulic drive module in Embodiment 1 of the utility model;

[0021] Figure 3 This is a cross-sectional view of the hydraulic drive module of Embodiment 1 of the utility model;

[0022] Figure 4 This is a schematic diagram of the hydraulic drive module of Embodiment 1 of the utility model, at which time the small drain function of the drain valve is in the driving state;

[0023] Figure 5 This is a schematic diagram of the hydraulic drive module of Embodiment 1 of the utility model, at which time the drain valve large drain function is in the driving state;

[0024] Figure 6 This is a schematic diagram of the hydraulic lifting module of Example 1 of the utility model, at which time the small drain function of the drain valve is in the driving state;

[0025] Figure 7 This is a schematic diagram of the hydraulic lifting module of Example 1 of the utility model, at which time the drain valve large drain function is in the driving state;

[0026] Figure 8 This is a schematic diagram of the assembly of the drainage device and the water tank in Example 1 of the utility model;

[0027] Fig. 9 This is a schematic diagram of a hydraulic drive module in Embodiment 2 of the present utility model;

[0028] Fig.10 This is a schematic diagram of the hydraulic drive module of Example 2 of the utility model, which is in the driving and drainage state at this time.

[0029] Description of reference numerals:

[0030] 10-Hydraulic drive module,

[0031] 11-water inlet, 12-water outlet, 13-drainage outlet,

[0032] 14-main body, 141-moving parts,

[0033] 15-back pressure chamber, 151-pressure relief hole, 152-back pressure pad, 153-driving rod, 154-third return spring,

[0034] 20-Hydraulic lifting module,

[0035] 21-cylinder body, 211-cavity, 212-first sealing ring, 213-limiting convex part, 214-second return spring, 215-active cavity,

[0036] 22-Piston,

[0037] 23- spindle, 231- first return spring,

[0038] 24- Anti-pressure channel,

[0039] 30-Drain valve,

[0040] 40-Hose,

[0041] 50- water tank,

[0042] 60-External pressure water source. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0044] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] Example 1

[0046] Cooperate Figures 1 to 8 As shown, the utility model discloses a hydraulically driven drainage mechanism of a water tank 50, which cooperates with a drainage valve 30 to drive the drainage valve 30 to drain water.

[0047] Cooperate Figures 1 to 8 As shown, a water tank 50 hydraulically driven drainage mechanism comprises:

[0048] The hydraulic drive module 10 includes a water inlet 11, a water outlet 12 and a water drain 13. The water inlet 11 is connected to an external pressure water source 60. The hydraulic drive module 10 includes a movable member 141. When the movable member 141 is in a first position, the movable member 141 opens the water outlet 12 and closes the water drain 13, so that the water inlet 11 is connected to the water outlet 12. When the movable member 141 is in a second position, the movable member 141 closes the water inlet 11 and opens the water drain 13, so that the water outlet 12 is connected to the water drain 13.

[0049] The hydraulic lifting module 20 includes a cylinder body 1, a piston 22 and a pressure relief structure. The cylinder body 1 is provided with a cavity 211 connected to the water outlet 12. An external water source enters the cavity 211 to drive the piston 22 to rise. When the piston 22 moves to a preset position, the cavity 211 drains water and relieves pressure through the pressure relief structure.

[0050] The water inlet 11 of the hydraulic driving module 10 is connected to the external pressure water source 60, and the external pressure water source 60 supplies water to the hydraulic driving module 10 to provide hydraulic driving force, and the water flows to the hydraulic lifting module 20 through the water outlet 12. The hydraulic driving module 10 controls the water inlet or water stop of the hydraulic lifting module 20 through the water inlet 11, and the hydraulic lifting module 20 is hydraulically driven by the water flow pressure to lift and drive the drain valve 30 to open and drain.

[0051] A movable part 141 is provided in the hydraulic lifting module 20. By switching the movable part 141 between the first position and the second position, the switching of the water inlet and water discharge state of the hydraulic driving module 10 is controlled. When the movable part 141 is in the first position, the movable part 141 opens the water outlet 12 and closes the water discharge port 13, so that the water inlet 11 is connected with the water outlet 12, and the external pressure water source 60 enters the hydraulic lifting module 20 through the water outlet 12, and the hydraulic lifting module 20 then drives the drain valve 30 to drain water. When the movable part 141 is in the second position, the movable part 141 closes the water inlet 11 and opens the water discharge port 13, so that the water outlet 12 is connected with the water discharge port 13, and the hydraulic driving module 10 and the hydraulic lifting module 20 quickly discharge water through the water discharge port 13.

[0052] Among them, when the piston 22 moves to the preset position, a certain amount of water has been stored in the cavity 211, and the pressure in the inner cavity is also relatively high. The pressure is released through the pressure relief structure to ensure that the internal pressure will not affect the operation of the drainage mechanism or even damage the parts. There is no drainage pressure relief before the piston 22 moves to the preset position. Even if the pressure of the external pressure water source 60 is relatively low, the drainage function of the piston 22 can be realized. When the piston 22 moves to the preset position, the pressure is released through the pressure relief structure. Even if the pressure of the external pressure water source 60 is high, the internal pressure will not be too high and the pressure will not be accumulated, which effectively ensures the stable operation of the entire drainage mechanism and protects the components at the same time.

[0053] Cooperate Figures 1 to 5 As shown, the hydraulic drive module 10 includes a main body 14, the movable part 141 is movably arranged in the main body 14, a back pressure chamber 15 is arranged between the movable part 141 and the main body 14, and the main body 14 is also provided with a pressure relief hole 151 connected to the back pressure chamber 15, a back pressure pad 152 and a driving rod 153 cooperating with the pressure relief hole 151, when the driving rod 153 drives the back pressure pad 152 to open the pressure relief hole 151, the movable part 141 moves to the first position, and when the back pressure pad 152 and the driving rod 153 are reset to close the pressure relief hole 151, the movable part 141 moves to the second position.

[0054] The body 14 has an inner cavity, and the drain port 13, the water inlet 11 and the water outlet 12 are all connected to the inner cavity, and the movable member 141 is movably arranged in the inner cavity, switching between the first position and the second position. When the external driving force drives the driving rod 153 to drive the back pressure pad 152 to open the pressure relief hole 151, the back pressure chamber 15 is depressurized, and the movable member 141 moves to the side of the back pressure chamber 15 under the action of the pressure difference, that is, it moves to the first position. At this time, the movable member 141 closes the drain port 13 and opens the water inlet 11 at the same time, and the external pressure water source 60 enters the hydraulic lifting module 20 through the water inlet 11 and the water outlet 12. The piston 22 of the hydraulic lifting module 20 moves to drive the drain valve 30 to drain water; when the external driving force disappears, the back pressure pad 152 and the driving rod 153 are restored. The back pressure pad 152 is reset together with the driving rod 153 under the action of the third reset spring 154. When the back pressure pad 152 is reset to close the pressure relief hole 151, the pressure in the back pressure chamber 15 rises slowly, driving the movable part 141 to reset to the second position. At this time, the movable part 141 closes the water inlet 11 and opens the water drain port 13, and the water outlet 12 is connected to the water drain port 13. The hydraulic drive module 10 and the hydraulic lifting module 20 release pressure through the water drain port 13, which can quickly discharge the water stored in the two modules, which is beneficial to quickly reset each component and make the drainage more sensitive.

[0055] The driving rod 153 is driven by a mechanical switch or an electric switch. In this embodiment, the driving rod 153 is connected to the external drainage button of the water tank 50. The external driving force of the driving rod 153 corresponds to the force of pressing the drainage button. The back pressure pad 152 opens or closes the pressure relief hole 151 to achieve the position switching of the movable part 141, realizes micro-stroke driving, and provides a good user experience. The design of the back pressure chamber 15 and the pressure relief hole 151 makes the switching of the movable part 141 between the first position and the second position more reliable and stable.

[0056] Cooperate Figure 6 to Figure 7 As shown, the pressure relief structure includes an anti-pressure-holding channel 24 connecting the cavity 211 with the outside. When the piston 22 moves to a preset position, the cavity 211 is drained and pressure-relieved through the anti-pressure-holding channel 24. The anti-pressure-holding channel 24 is connected to the outside of the hydraulic lifting module 20 (water tank 50). When the piston 22 moves to a preset position, the anti-pressure-holding channel 24 is not connected to the cavity 211, and the cavity 211 is sealed to store water. When the piston 22 rises to the point where the anti-pressure-holding channel 24 corresponds to the cavity 211, the anti-pressure-holding channel 24 is connected to the cavity 211, and the water in the cavity 211 is discharged through the anti-pressure-holding channel 24 to achieve pressure relief.

[0057] The piston 22 is movably mounted on the outer periphery of the cylinder body 1. A first sealing ring 212 is provided on the outer wall of the cylinder body 1. The anti-pressure-holding channel 24 is a concave structure provided on the inner wall of the piston 22. When the piston 22 rises to the point where the anti-pressure-holding channel 24 corresponds to the first sealing ring 212, the anti-pressure-holding channel 24 is connected to the cavity 211.

[0058] The cylinder body 1 is cylindrical, and its bottom end is connected to the water outlet 12 of the hydraulic drive module 10. The piston 22 is provided on the movable sleeve at the bottom. The cavity 211 is formed between the top of the cylinder body 1 and the piston 22. The first sealing ring 212 is arranged on the top of the cylinder body 1, and the anti-pressure channel 24 is arranged at the bottom end of the piston 22.

[0059] The anti-pressure-holding channel 24 is a concave structure arranged on the inner wall of the piston 22. When the first sealing ring 212 cooperates with other positions on the inner wall of the piston 22, the two can be sealed. When the first sealer and the anti-pressure-holding channel 24 are correspondingly matched, the concave design of the anti-pressure-holding channel 24 forms a gap between the piston 22 and the cylinder body 1, so that the anti-pressure-holding channel 24 is connected with the cavity 211. The anti-pressure-holding channel 24 can be designed as an annular groove arranged along the circumference of the inner wall of the piston 22, which can be a full circle or a partial groove, or other suitable concave structures.

[0060] In this embodiment, the first sealing ring 212 is a Y-shaped, U-shaped or V-shaped sealing ring, so that the first sealer has a certain deformation in the radial direction of the cylinder body 1, which is convenient for pressure relief, drainage and sealing.

[0061] In this embodiment, the hydraulic drive module 10 and the hydraulic lifting module 20 are integrated and installed together, or the water outlet 12 of the hydraulic drive module 10 and the cylinder body 1 of the hydraulic lifting module 20 are connected by a hose 40. The hydraulic drive module 10 can be assembled with the hydraulic lifting module 20 as a whole, so that the structure is more integrated, and the water inlet, water discharge and pressure relief are more stable and fast; the hydraulic drive module 10 can also be connected with the hydraulic lifting module 20 through a hose 40, so that the hydraulic drive module 10 can be flexibly set at different positions of the water tank 50, and the assembly and use are more flexible.

[0062] Cooperate Figure 1 , Figures 6 to 8 As shown, the utility model also discloses a drainage device, including the above-mentioned water tank 50 hydraulically driven drainage mechanism and the drainage valve 30, the drainage valve 30 includes a starter that can be driven to open the drainage port of the drainage valve 30, and the piston 22 is transmission-connected to the starter.

[0063] The hydraulically driven drainage mechanism and the drainage valve 30 are both installed in the water tank 50. The drainage valve 30 has a valve core for opening and closing its drainage port. The actuator controls the movement of the valve core to open the drainage port for drainage. The piston 22 of the hydraulic lifting module 20 is in transmission connection with the actuator of the drainage valve 30. The piston 22 rises and drives the actuator to rise, thereby opening the drainage valve 30 for drainage. The piston 22 rises to a predetermined position, and the corresponding actuator moves to the position to open the drainage port. The hydraulic lifting module 20 is assembled on the drainage valve 30.

[0064] In this embodiment, the drain valve 30 includes a large drain starter and a small drain starter, which are respectively connected to the two starters through two hydraulic lifting modules 20. Correspondingly, the two hydraulic lifting modules 20 are respectively connected to a hydraulic drive module 10, so that the large drain function and the small drain function of the drain valve 30 are independent of each other and do not affect each other. Preferably, the two hydraulic drive modules 10 can be integrated into a module structure, making the overall structure more reasonable and compact.

[0065] Cooperate Figure 8 As shown, the utility model also discloses a hidden water tank 50, in which the above-mentioned drainage device is installed, and the water tank 50 is also provided with a driving module, and the driving module is used to drive the movable part 141, and the driving module is a mechanical switch or an electric control switch. The driving module drives the driving rod 153 to move, thereby driving the movable part 141 to move. In this embodiment, the driving module is a mechanical switch, which is a drainage button connected to the driving rod 153.

[0066] Example 2

[0067] Cooperate Figures 9 and 10 As shown, the difference between this embodiment and embodiment 1 mainly lies in the different designs of the hydraulic lifting mechanism.

[0068] In this embodiment, the pressure relief structure also includes a core shaft 23 that cooperates with the opening and closing of the anti-pressure holding channel 24. When the water pressure in the cavity 211 exceeds a predetermined value, the piston 22 rises to a preset position, and the core shaft 23 moves relative to the anti-pressure holding channel 24 to open the anti-pressure holding channel 24.

[0069] The anti-pressure-holding channel 24 is provided at the top of the piston 22, and the core shaft 23 is movably installed in the anti-pressure-holding channel 24, with its bottom end located in the cavity 211 and its top end located outside the piston 22. The water flow pressure drives the piston 22 and the core shaft 23 to rise together, and at the same time, the core shaft 23 always has an upward movement trend relative to the piston 22, at which time the core shaft 23 closes the anti-pressure-holding channel 24; when the piston 22 moves to a preset position, the core shaft 23 has a relative downward displacement relative to the piston 22, thereby opening the anti-pressure-holding channel 24 to communicate with the cavity 211.

[0070] The cylinder body 1 is provided with an active chamber 215, and the piston 22 is movably arranged in the active chamber 215 up and down. The top wall of the active chamber 215 is provided with a limiting protrusion 213 corresponding to the core shaft 23. When the core shaft 23 abuts against the limiting protrusion 213, the piston 22 is driven to continue to rise to a preset position to disengage from the core shaft 23, so that the anti-pressure congestion channel 24 is opened.

[0071] The pressure of the incoming water flow drives the piston 22 and the core shaft 23 to rise together. When the top of the core shaft 23 abuts against the limiting protrusion 213, the core shaft 23 stops rising, and the piston 22 continues to rise under the action of the incoming water flow, so that the core shaft 23 has a relative downward displacement relative to the piston 22, thereby opening the anti-pressure congestion channel 24 to connect it with the cavity 211.

[0072] In this embodiment, a first return spring 231 is provided between the top end of the core shaft 23 and the piston 22, and a second return spring 214 is provided between the piston 22 and the top wall of the cylinder body 1. The first return spring 231 enables the core shaft 23 to always have an upward movement trend relative to the piston 22, thereby ensuring the reliability of the core shaft 23 sealing the anti-pressure holding passage 24; the second return spring 214 enables the piston 22 and the core shaft 23 to quickly return to their original position when the cavity 211 is drained and depressurized.

[0073] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A hydraulically driven drainage mechanism, characterized in that: include: A hydraulic drive module, comprising a water inlet, a water outlet and a water drain, wherein the water inlet is connected to an external pressure water source, and the hydraulic drive module comprises a movable part, wherein when the movable part is in a first position, the movable part opens the water outlet and closes the water drain, so that the water inlet is connected to the water outlet, and when the movable part is in a second position, the movable part closes the water inlet and opens the water drain, so that the water outlet is connected to the water drain; The hydraulic lifting module includes a cylinder body, a piston and a pressure relief structure. The cylinder body is provided with a cavity connected to the water outlet. An external water source enters the cavity to drive the piston to rise. When the piston moves to a preset position, the cavity drains water and relieves pressure through the pressure relief structure.

2. A hydraulically driven drainage mechanism according to claim 1, characterized in that: The pressure relief structure includes an anti-pressure-holding passage connecting the cavity with the outside. When the piston moves to a preset position, the cavity is drained and pressure is relieved through the anti-pressure-holding passage.

3. A hydraulically driven drainage mechanism according to claim 2, characterized in that: The piston is movably sleeved on the outer periphery of the cylinder body, a first sealing ring is provided on the outer wall of the cylinder body, the anti-pressure-holding channel is a concave structure provided on the inner wall of the piston, when the piston rises to the point where the anti-pressure-holding channel corresponds to the first sealing ring, the anti-pressure-holding channel is connected to the cavity, and the first sealing ring is a Y-shaped, U-shaped or V-shaped sealing ring.

4. A hydraulically driven drainage mechanism according to claim 2, characterized in that: The pressure relief structure also includes a core shaft that cooperates with the opening and closing of the anti-pressure holding channel. When the piston moves to a preset position, the core shaft moves relative to the anti-pressure holding channel to open the anti-pressure holding channel.

5. A hydraulically driven drainage mechanism according to claim 4, characterized in that: The cylinder body is provided with an active cavity, and the piston is movably arranged in the active cavity up and down. The top wall of the active cavity is provided with a limiting protrusion corresponding to the core shaft. When the core shaft abuts against the limiting protrusion, the piston is driven to continue to rise to a preset position to disengage from the core shaft, so that the anti-pressure holding channel is opened.

6. A hydraulically driven drainage mechanism according to claim 5, characterized in that: A first return spring is arranged between the top end of the core shaft and the piston, and a second return spring is arranged between the piston and the top wall of the cylinder body.

7. A hydraulically driven drainage mechanism according to claim 1, characterized in that: The hydraulic driving module and the hydraulic lifting module are integrated and installed together, or the water outlet of the hydraulic driving module and the cylinder body of the hydraulic lifting module are connected by a hose.

8. The hydraulically driven drainage mechanism according to claim 1, characterized in that: The hydraulic drive module includes a main body, the movable part is movably arranged in the main body, a back pressure chamber is arranged between the movable part and the main body, the main body is also provided with a pressure relief hole connected to the back pressure chamber, a back pressure pad and a driving rod matched with the pressure relief hole, when the driving rod drives the back pressure pad to open the pressure relief hole, the movable part moves to the first position, when the back pressure pad and the driving rod are reset to close the pressure relief hole, the movable part moves to the second position.

9. A drainage device, characterized in that: It comprises a hydraulically driven drainage mechanism and a drainage valve as described in any one of claims 1 to 8, wherein the drainage valve comprises a starting member that can be driven to open a drainage port of the drainage valve, and the piston is transmission-connected to the starting member.

10. A hidden water tank, characterized in that: It includes a drainage device as described in claim 9, wherein the water tank is further provided with a driving module, and the driving module is used to drive the movable part, and the driving module is a mechanical switch or an electric control switch.

Images