Hydraulic drive mechanism and drainage device having the same

Abstract

The present invention discloses a hydraulic drive mechanism and a drainage device having the same. The hydraulic drive mechanism includes a body having a water inlet channel and a hydraulic assembly. The hydraulic assembly includes a hydraulic cylinder, a piston cooperating with the hydraulic cylinder, and a reset member for providing a reset force to the piston. The water inlet channel supplies water to the hydraulic cylinder, and the water pressure in the water inlet channel drives the piston to move. An open air partition is formed between the water outlet of the water inlet channel and the water inlet of the hydraulic cylinder. The water outlet of the water inlet channel corresponds to the position of the water inlet of the hydraulic cylinder. The water in the water inlet channel flows through the air partition to the water inlet of the hydraulic cylinder. The hydraulic drive mechanism of the present invention has an anti-siphon function and a simple and compact structure.

Description

Technical Field

[0001] The invention relates to a hydraulic drive mechanism and a drainage device having the hydraulic drive mechanism. Background Art

[0002] In the prior art, a hydraulic drive mechanism is used to drive the drain valve in the water tank. Specifically, when water flows into the hydraulic cylinder of the hydraulic drive mechanism, the water pressure pushes the piston in the hydraulic cylinder, and the piston in turn links the starting component of the drain valve, and the starting component of the drain valve in turn controls the opening of the drain port of the drain valve; when the hydraulic cylinder stops taking in water, the piston is no longer affected by the water pressure, and the piston discharges the water in the hydraulic cylinder under the action of the reset force, thereby resetting the piston and preparing for the next drainage drive.

[0003] However, in the existing hydraulic drive mechanism, when negative pressure occurs in the water inlet channel supplying water to the hydraulic cylinder, a siphon phenomenon may occur, causing the water in the water tank to flow back into the water inlet channel through the hydraulic cylinder, thereby polluting the water source.

[0004] In view of this, the present invention arises as the times require. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic drive mechanism and a drainage device having the hydraulic drive mechanism, which has an anti-siphon function and a simple and compact structure.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, the technical solution adopted by the present invention is: a hydraulic drive mechanism, including a main body with a water inlet channel and a hydraulic component, the hydraulic component including a hydraulic cylinder, a piston cooperating with the hydraulic cylinder and a reset part for providing a reset force to the piston, the water inlet channel supplies water to the hydraulic cylinder, the water flow pressure of the water inlet channel drives the piston to move, an open air partition is formed between the water outlet of the water inlet channel and the water inlet of the hydraulic cylinder, the water outlet of the water inlet channel corresponds to the water inlet position of the hydraulic cylinder, and the water flow of the water inlet channel flows to the water inlet of the hydraulic cylinder after passing through the air partition.

[0007] Preferably, when the water inlet channel stops water, the water in the hydraulic cylinder flows out to the outside through the water inlet of the hydraulic cylinder under the push of the piston.

[0008] Preferably, a switch valve is provided at the water inlet of the hydraulic cylinder. When water enters the water inlet channel, the switch valve is in a state of opening the water inlet of the hydraulic cylinder; when water stops flowing through the water inlet channel, the switch valve closes the water inlet of the hydraulic cylinder and reopens the water inlet of the hydraulic cylinder after a predetermined time.

[0009] Preferably, a one-way valve is provided at the water inlet of the hydraulic cylinder, and the one-way valve opens the water inlet of the hydraulic cylinder in one direction under the action of the water flow in the water inlet channel. The hydraulic cylinder is provided with a drain port connected to the inner cavity of the hydraulic cylinder, and a drain port opening and closing mechanism is provided at the drain port. During the process of the water inlet channel supplying water to the hydraulic cylinder, the drain port opening and closing mechanism closes the drain port; when the drain port opening and closing mechanism opens the drain port, the water in the hydraulic cylinder flows out through the drain port under the push of the piston.

[0010] Preferably, the drain opening and closing mechanism adopts an electrically controlled opening and closing valve, a mechanical opening and closing valve, or a buoyancy control valve.

[0011] Preferably, the cross-sectional area S2 of the water outlet of the water inlet channel is smaller than the cross-sectional area S1 of the water inlet of the water inlet channel.

[0012] Preferably, the distance L between the water outlet of the water inlet channel and the water inlet of the hydraulic cylinder is ≥20 mm.

[0013] Preferably, the water outlet of the water inlet channel is provided with a diversion section.

[0014] Preferably, the cross-sectional dimension of the water outlet of the water inlet channel is substantially the same as the cross-sectional dimension of the water inlet of the hydraulic cylinder.

[0015] Preferably, a funnel guide structure is provided at the water inlet of the hydraulic cylinder, and the size of the funnel guide structure gradually decreases along the direction of the water flow. The cross-sectional size of the outer end of the funnel guide structure is larger than the cross-sectional size of the water outlet of the water inlet channel, and the cross-sectional size of the inner end of the funnel guide structure is approximately the same as the cross-sectional size of the water outlet of the water inlet channel.

[0016] Preferably, the reset member is an elastic member provided in the hydraulic cylinder, and the water flow in the water inlet channel overcomes the elastic force of the elastic member to push the piston to move; the hydraulic cylinder is fixedly mounted on the main body; or, the hydraulic cylinder and the main body are independently arranged and connected through a pipeline, and the water inlet end of the pipeline forms the water inlet of the hydraulic cylinder.

[0017] Preferably, the air partition is located in a water tank, and the water splashed from the air partition flows into the water tank.

[0018] According to another aspect of the present invention, the present invention also provides a drainage device, comprising a drainage valve arranged in a water tank and the hydraulic drive mechanism described in any one of the above items, wherein the piston opens the drainage valve to drain water by linking with the starting component of the drainage valve.

[0019] Based on the above technical solution, the embodiments of the present invention can produce at least the following beneficial effects:

[0020] (1) The present invention provides an air partition connected to the outside air between the water outlet of the water inlet channel and the water inlet of the hydraulic cylinder. That is, the water outlet of the water inlet channel and the water inlet of the hydraulic cylinder are disconnected and there are no connecting parts between the two. In this way, when negative pressure appears in the water inlet channel, outside air can enter the water inlet channel through the air partition to prevent siphoning, thereby preventing water from flowing back into the water inlet channel through the hydraulic cylinder and polluting the water source.

[0021] (2) The water inlet of the hydraulic cylinder is used as the drain port of the hydraulic cylinder at the same time. The water inlet and drain port of the hydraulic cylinder are combined into one, which makes the structure simpler and more compact. In addition, since the water inlet of the hydraulic cylinder is connected to the outside air through an air partition, when the water inlet of the hydraulic cylinder is not provided with a switch valve, once the water inlet channel stops supplying water to the hydraulic cylinder, the water flow in the hydraulic cylinder can be immediately discharged from the water inlet of the hydraulic cylinder under the action of the piston reset force, the water discharge speed is faster, thereby making the piston reset faster. In this way, the starting component of the drain valve controlled by the piston can also close the drain valve faster, the response is faster and more sensitive, and the drainage control effect is better.

[0022] (3) When a switch valve is provided at the water inlet of the hydraulic cylinder, when water enters the water inlet channel, the switch valve is in a state of opening the water inlet of the hydraulic cylinder; when water stops flowing through the water inlet channel, the switch valve closes the water inlet of the hydraulic cylinder and reopens the water inlet of the hydraulic cylinder after a predetermined time. In this way, the piston can be maintained at the driving position for a predetermined time by the water pressure in the hydraulic cylinder so that the drain valve can maintain the drain port open for a predetermined time. There is no need for the water inlet channel to continuously supply water and waste water resources. After the switch valve closes the water inlet of the hydraulic cylinder, the hydraulic cylinder is in a pressure-maintaining state, so that the piston can be maintained at the driving position until the water inlet of the hydraulic cylinder is reopened by the switch valve. The water in the hydraulic cylinder then flows out from the water inlet of the hydraulic cylinder under the push of the piston, thereby draining the hydraulic cylinder and resetting the piston to prepare for the next drive.

[0023] (4) By providing a one-way valve at the water inlet of the hydraulic cylinder, and providing a drain port and a drain port opening and closing mechanism for opening and closing the drain port on the hydraulic cylinder, there is no need to continuously supply water to the water inlet channel and waste water resources. The one-way valve closes the water inlet of the hydraulic cylinder after the water inlet channel stops water, and the hydraulic cylinder is in a pressure-maintaining state. Therefore, the piston can be maintained in the driving position until the drain port of the hydraulic cylinder is opened by the drain port opening and closing mechanism. The water in the hydraulic cylinder flows out from the drain port of the hydraulic cylinder under the push of the piston, thereby draining the hydraulic cylinder and resetting the piston to prepare for the next drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 is a cross-sectional view of a hydraulic drive mechanism according to a first embodiment of the present invention;

[0026] Figure 2 A perspective view of a hydraulic drive mechanism according to a first embodiment of the present invention;

[0027] Figure 3 A partial perspective view of the hydraulic drive mechanism according to the first embodiment of the present invention;

[0028] Figure 4 for Figure 3 A cross-sectional view of the embodiment of the present invention is provided, and a schematic diagram of water flow when water enters the water inlet channel is drawn;

[0029] Figure 5 for Figure 3 A cross-sectional view of the hydraulic cylinder is also shown, with a schematic diagram of the water flow when the hydraulic cylinder is draining water;

[0030] Figure 6 A partial cross-sectional view of the hydraulic drive mechanism according to the second embodiment of the present invention, with the hydraulic cylinder in a water-filled state;

[0031] Figure 7 A partial cross-sectional view of the hydraulic drive mechanism according to the second embodiment of the present invention when the hydraulic cylinder is in a pressure-maintaining state;

[0032] Figure 8 A partial cross-sectional view of the hydraulic drive mechanism according to the second embodiment of the present invention when the hydraulic cylinder is in a pressure relief state;

[0033] Figure 9 A partial cross-sectional view of the hydraulic drive mechanism according to the third embodiment of the present invention, with the hydraulic cylinder in a water-filled state;

[0034] Figure 10 A partial cross-sectional view of the hydraulic drive mechanism according to the third embodiment of the present invention when the hydraulic cylinder is in a pressure-maintaining state;

[0035] Figure 11 A partial cross-sectional view of the hydraulic drive mechanism according to the third embodiment of the present invention when the hydraulic cylinder is in a pressure relief state;

[0036] Figure 12 is an exploded perspective view of a hydraulic drive mechanism according to a third embodiment of the present invention;

[0037] Figure 13 4 is a cross-sectional view of a hydraulic drive mechanism according to a fourth embodiment of the present invention.

[0038] Reference numerals in the figures:

[0039] 10. Main body; 11. Water inlet channel; 111. Water inlet of the water inlet channel; 112. Water outlet of the water inlet channel; 113. Straight diversion section;

[0040] 21. Hydraulic cylinder; 211. Water inlet of the hydraulic cylinder; 22. Piston; 23. Funnel diversion structure; 24. Drain port;

[0041] 30. Air partition;

[0042] 40. One-way valve; 41. Sealing ball support rib;

[0043] 50. Drain valve starter assembly;

[0044] 60. Compression spring;

[0045] 70. Pipeline; 71. Water inlet end of the pipeline;

[0046] 80. Drain opening and closing mechanism; 81. Float; 82. Rocker arm; 83. Sealing gasket. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] See Figures 1 to 5 The hydraulic drive mechanism provided by the present invention includes a body 10 having a water inlet channel 11 and a hydraulic assembly. The hydraulic assembly includes a hydraulic cylinder 21, a piston 22 engaged with the hydraulic cylinder 21, and a reset member for providing a reset force to the piston 22. In this embodiment, the reset member is an elastic member disposed in the hydraulic cylinder 21, and is a compression spring 60. The two ends of the compression spring 60 are respectively pressed between the inner side of the hydraulic cylinder 21 and the piston 22.

[0049] The water inlet channel 11 supplies water to the hydraulic cylinder 21, and the water pressure from the water inlet channel 11 pushes the piston 22 to move. An open air barrier 30 is formed between the water outlet 112 of the water inlet channel and the water inlet 211 of the hydraulic cylinder. The water outlet 112 of the water inlet channel 11 corresponds to the position of the water inlet 211 of the hydraulic cylinder. Water from the water inlet channel 11 flows through the air barrier 30 and then to the water inlet 211 of the hydraulic cylinder. Thus, when negative pressure develops in the water inlet channel 11, outside air can enter through the air barrier 30, preventing siphoning and preventing water from flowing back into the water inlet channel 11 through the hydraulic cylinder 21 and contaminating the water source.

[0050] Preferably, when the water inlet channel 11 stops supplying water, the water in the hydraulic cylinder 21 flows out to the outside world through the water inlet 211 of the hydraulic cylinder under the push of the piston 22. That is, the water inlet 211 of the hydraulic cylinder also serves as the drain port of the hydraulic cylinder 21. The water inlet and drain port of the hydraulic cylinder are combined into one, resulting in a simpler and more compact structure. Furthermore, since the water inlet 211 of the hydraulic cylinder is connected to the outside air through the air barrier 30, once the water inlet channel 11 stops supplying water to the water inlet 211 of the hydraulic cylinder, the water in the hydraulic cylinder 21 can immediately be discharged through the water inlet 211 of the hydraulic cylinder under the action of the reset force of the piston 22, resulting in a faster water discharge speed, thereby causing the piston 22 to reset faster. In this way, the starter assembly 50 of the drain valve controlled by the piston 22 can also close the drain valve more quickly, respond more quickly and sensitively, and achieve better drainage control effect.

[0051] When the drain valve itself does not have a structure to maintain the drain outlet open (such as a buoyancy device), the piston 22 must remain in the driven position to maintain the drain outlet open for a predetermined period of time. In this case, water must be continuously supplied to the hydraulic cylinder 21 through the water inlet channel 11 so that the water supply can be stopped only after the piston 22 remains in the driven position for a predetermined period of time. However, when the drain valve itself has a structure to maintain the drain outlet open (such as a buoyancy device), after the drain valve is driven to open the drain outlet by the piston 22, the drain valve can maintain the drain outlet open for a period of time due to the action of its own buoyancy device or other structure. In this way, there is no need for the water inlet channel 11 to continuously supply water. The water inlet channel 11 can stop supplying water after the piston 22 moves to the driven position.

[0052] Please refer to Figures 1 to 5 In this embodiment, the hydraulic cylinder 21 and the main body 10 are integrally formed. The two can be fixedly connected or integrally formed. The water outlet 112 of the water inlet channel corresponds to the water inlet 211 of the hydraulic cylinder 21, so that the water flow from the water outlet 112 of the water inlet channel can flow into the water inlet 211 of the hydraulic cylinder.

[0053] Preferably, in order to increase the water outlet speed of the water outlet 112 of the water inlet channel and improve the water outlet pressure of the water outlet 112 of the water inlet channel, the cross-sectional area S2 of the water outlet 112 of the water inlet channel is smaller than the cross-sectional area S1 of the water inlet 111 of the water inlet channel, so that the water flow pressure flowing from the water inlet channel 11 to the hydraulic cylinder 21 is larger, so as to effectively push the piston 22 to move relative to the hydraulic cylinder 21.

[0054] Preferably, in this embodiment, the distance L between the water outlet 112 of the water inlet channel and the water inlet 211 of the hydraulic cylinder is ≥20 mm.

[0055] In order to make the outflow of the water outlet 112 of the water inlet channel more concentrated, in this embodiment, the water outlet 112 of the water inlet channel is provided with a guide section 113. The guide section 113 can be a straight section or a tapered section.

[0056] Preferably, the cross-sectional dimensions of the water outlet 112 of the water inlet channel are substantially the same as the cross-sectional dimensions of the water inlet 211 of the hydraulic cylinder.

[0057] When water enters the water inlet channel 11 , a small amount of water will be ejected outward from the air partition 30 . Therefore, the air partition 30 is preferably disposed in a water tank so that the water ejected from the air partition 30 can flow into the water tank.

[0058] In order to better receive the water flow out of the water outlet 112 of the water inlet channel, in this embodiment, a funnel guide structure 23 is provided at the water inlet 211 of the hydraulic cylinder. The size of the funnel guide structure 23 gradually decreases along the direction of the incoming water flow. The cross-sectional size of the outer end of the funnel guide structure 23 is larger than the cross-sectional size of the water outlet 112 of the water inlet channel, and the cross-sectional size of the inner end of the funnel guide structure 23 is approximately the same as the cross-sectional size of the water outlet 112 of the water inlet channel.

[0059] Please refer to Figure 1 、 Figure 2 and Figure 4 , Figure 4 The diagram shows a schematic diagram of water flow when water enters the water inlet channel 11. Water flows into the water inlet 111 of the water inlet channel and flows out through the water outlet 112 of the water inlet channel. The water flowing out of the water outlet 112 of the water inlet channel enters the water inlet 211 of the hydraulic cylinder after passing through the air partition 30. The water flow overcomes the elastic force of the compression spring 60 to drive the piston 22 in the hydraulic cylinder 21 to move downward, and the piston 22 then drives the starting assembly 50 of the drain valve to open the drain valve for drainage.

[0060] Please refer to Figure 1 、 Figure 2 and Figure 5 , Figure 5 The figure shows a schematic diagram of water flow when the water inlet channel 11 is cut off. At this time, the piston 22 immediately squeezes the water in the hydraulic cylinder 21 from the water inlet 21 of the hydraulic cylinder under the action of the compression spring 60, and discharges it to the outside through the air partition 30. The piston 22 drives the starting component 50 of the drain valve to reset in time, so that the drain valve can immediately stop draining when the water inlet channel 11 is cut off. The response speed is fast, and the drainage volume control is accurate and stable.

[0061] Please refer to Figures 6 to 8The hydraulic drive mechanism of the second preferred embodiment of the present invention differs from the first preferred embodiment in that, in this embodiment, a one-way valve 40 is provided at the water inlet 211 of the hydraulic cylinder. Specifically, the one-way valve 40 is a sealing ball, but it can also be a sealing plate, and the specific structure of the one-way valve is not limited thereto. Sealing ball support ribs 41 are provided within the hydraulic cylinder 21 at a location corresponding to the water inlet 211. The sealing ball 40 is supported on the sealing ball support ribs 41 by gravity and the water pressure of the water inlet channel 11. The one-way valve 40 opens the water inlet 211 of the hydraulic cylinder in one direction under the action of the water flow in the water inlet channel 11. The hydraulic cylinder 21 is provided with a drain port 24 connected to the inner cavity of the hydraulic cylinder 21. The drain port 24 is provided with a drain port opening and closing mechanism 80. When the water inlet channel 11 supplies water to the hydraulic cylinder 21, the drain port opening and closing mechanism 80 closes the drain port 24; when the drain port opening and closing mechanism 80 opens the drain port 24, the water in the hydraulic cylinder 21 flows out through the drain port 24 under the push of the piston 22.

[0062] In this embodiment, when the water inlet channel 11 stops water, the one-way valve 40 (sealing ball) will move upward under the action of the water pressure in the hydraulic cylinder 21 and close the hydraulic cylinder water inlet 211. The drain port opening and closing mechanism 80 controls the opening of the drain port 24 after a preset time when the water inlet channel 11 stops water. In this way, within the preset time after the water inlet channel 11 stops water, the hydraulic cylinder water inlet 211 and the drain port 24 are both closed, thereby placing the hydraulic cylinder 21 in a pressure-maintaining state, and thereby maintaining the piston 22 in the driven position for the preset time. The drain valve used in this embodiment is a structure that cannot maintain the drain port open by itself (for example, no buoyancy device is provided), so the piston 22 needs to be maintained in the driven position so that the drain valve can maintain drainage for the preset time.

[0063] In this embodiment, the drain opening and closing mechanism 80 adopts an electrically controlled opening and closing valve, specifically a solenoid valve.

[0064] When this embodiment works, Figure 6 As shown, at this time, the hydraulic cylinder 21 of the hydraulic drive mechanism is in a water-intake state, and the one-way valve 40 is supported on the sealing ball support rib 41 under the action of its own gravity and the water flow pressure of the water inlet channel 11, and the water inlet 211 of the hydraulic cylinder remains in an open state.

[0065] like Figure 7 As shown, at this time, the hydraulic cylinder 21 of the hydraulic drive mechanism is in a pressure-maintaining state, the water inlet channel 11 stops water, and the one-way valve 40 moves upward under the action of the water pressure in the hydraulic cylinder 21 and closes the water inlet 211 of the hydraulic cylinder, while the drain port 24 has not yet been opened by the drain port opening and closing mechanism 80.

[0066] like Figure 8 As shown, at this time, the hydraulic cylinder 21 of the hydraulic drive mechanism is in a pressure relief state. Figure 7After the state is maintained for a preset time, the drain port opening and closing mechanism 80 opens the drain port 24, and the water in the hydraulic cylinder 21 flows out from the drain port 24 under the action of the piston 22. The piston 22 is reset, and the one-way valve 40 loses the water pressure in the hydraulic cylinder 21, falls down and resets under the action of gravity, and reopens the water inlet 211 of the hydraulic cylinder.

[0067] Please refer to Figures 9 to 12 The difference between the hydraulic drive mechanism of the third preferred embodiment of the present invention and the second preferred embodiment is that, in this embodiment, the drain port opening and closing mechanism 80 adopts a buoyancy control valve, which specifically includes a float bucket 81, a rocker arm 82 linked to the float bucket 81, and a sealing gasket 83 provided on the rocker arm 82. The float bucket 81 moves up and down with the water level of the water tank and drives the sealing gasket 83 to open or close the drain port 24 through the rocker arm 82.

[0068] When this embodiment works, Figure 9 As shown, at this time, the hydraulic cylinder 21 of the hydraulic drive mechanism is in a water-filled state, the one-way valve 40 is supported on the sealing ball support rib 41 under the action of water flow pressure, and the water inlet 211 of the hydraulic cylinder remains in an open state.

[0069] like Figure 10 As shown, at this point, the hydraulic cylinder 21 of the hydraulic drive mechanism is in a pressure-maintaining state, the water inlet channel 11 is water-stopped, and the one-way valve 40 moves upward under the water pressure within the hydraulic cylinder 21, closing the hydraulic cylinder's water inlet 211. However, the drain port 24 has not yet been opened by the drain port opening and closing mechanism 80, and the float 81 of the drain port opening and closing mechanism 80 remains in a floating state. The piston 22 remains in the driven position, allowing the drain valve to continue draining water.

[0070] like Figure 11 As shown, as the drain valve continues to drain water, the water level in the water tank drops to a point where the buoyancy of the float 81 is insufficient. The float 81 then drops along with the water level in the water tank, driving the swing arm 82 to swing. This in turn causes the sealing gasket 83 to open the drain port 24. The water in the hydraulic cylinder 21 flows out of the drain port 24 under the action of the piston 22. The piston 22 resets, and the one-way valve 40 loses the water pressure in the hydraulic cylinder 21. It then drops and resets under the action of gravity, opening the hydraulic cylinder's water inlet 211. At this point, the hydraulic cylinder 21 of the hydraulic drive mechanism is in a depressurized state.

[0071] Of course, in other embodiments, the drain port opening and closing mechanism 80 may also be a mechanical opening and closing valve, etc., which is provided with a delay structure. In this way, the mechanical opening and closing valve can open the drain port 24 after a preset time when the water inlet channel is stopped through the delay structure. The mechanical opening and closing valve can adopt a structure in the prior art that can achieve delay through a spring or damping oil, etc.

[0072] In other embodiments, a switch valve (not shown) may be provided at the water inlet 211 of the hydraulic cylinder. When water enters the water inlet channel 11, the switch valve is in a state of opening the water inlet 211 of the hydraulic cylinder, so that the water flow of the water inlet channel can enter the hydraulic cylinder 21 through the water inlet 211 of the hydraulic cylinder to drive the piston 22 to move; when water stops flowing through the water inlet channel 11, the switch valve closes the water inlet 211 of the hydraulic cylinder, and reopens the water inlet 211 of the hydraulic cylinder after a predetermined time. During the predetermined time, the hydraulic cylinder 21 is in a pressure maintaining state, so that the piston 22 remains in the driving position, thereby controlling the drain valve to remain in the open state for a preset time. After the water inlet 211 of the hydraulic cylinder is reopened by the switch valve, the water in the hydraulic cylinder 21 flows out through the water inlet 211 of the hydraulic cylinder under the action of the piston 22. The switch valve can be a solenoid valve, and the opening and closing time of the solenoid valve is controlled by a program; or the switch valve can also be a mechanical valve with a delay structure. After the mechanical switch valve is closed, it is reset to the open state after a preset delay time under the action of the delay structure. The mechanical switch valve with a delay structure can adopt the commonly used structure in the prior art, such as the commonly used structure that realizes delay by a spring or damping oil.

[0073] Please refer to Figure 13 The difference between the hydraulic drive mechanism of the fourth preferred embodiment of the present invention and the first preferred embodiment is that, in this embodiment, the hydraulic cylinder 21 is independently arranged with the body 10 and is connected through the pipeline 70, and the water inlet end 71 of the pipeline 70 forms the water inlet 211 of the hydraulic cylinder.

[0074] According to another aspect of the present invention, there is also provided a drainage device, comprising a drainage valve (not shown) provided in a water tank (not shown) and any of the above-mentioned hydraulic drive mechanisms, wherein the piston 22 is linked to the drainage valve starter assembly 50 to open the drainage valve for drainage. Figure 2 In this embodiment, the starting component 50 of the drain valve is specifically a wire rope component.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic drive mechanism comprising a body having a water inlet channel and a hydraulic assembly, wherein the hydraulic assembly comprises a hydraulic cylinder, a piston cooperating with the hydraulic cylinder, and a reset member for providing a reset force to the piston. The water inlet channel supplies water to the hydraulic cylinder, and the water pressure in the water inlet channel drives the piston to move. The mechanism is characterized in that: An open air partition is formed between the water outlet of the water inlet channel and the water inlet of the hydraulic cylinder. The water outlet of the water inlet channel corresponds to the water inlet of the hydraulic cylinder. The water flow of the water inlet channel flows through the air partition to the water inlet of the hydraulic cylinder. The water in the hydraulic cylinder flows out to the outside through the water inlet of the hydraulic cylinder under the push of the piston; Alternatively, a switch valve is provided at the water inlet of the hydraulic cylinder, and when water is flowing into the water inlet channel, the switch valve is in a state of opening the water inlet of the hydraulic cylinder; when water is not flowing into the water inlet channel, the switch valve closes the water inlet of the hydraulic cylinder and reopens the water inlet of the hydraulic cylinder after a predetermined time; Alternatively, a one-way valve is provided at the water inlet of the hydraulic cylinder, and the one-way valve opens the water inlet of the hydraulic cylinder in one direction under the action of the water flow in the water inlet channel. The hydraulic cylinder is provided with a drain port connected to the inner cavity of the hydraulic cylinder, and a drain port opening and closing mechanism is provided at the drain port. During the process of the water inlet channel supplying water to the hydraulic cylinder, the drain port opening and closing mechanism closes the drain port; when the drain port opening and closing mechanism opens the drain port, the water in the hydraulic cylinder flows out through the drain port under the push of the piston.

2. The hydraulic drive mechanism according to claim 1, characterized in that: The drain port opening and closing mechanism adopts an electric-controlled opening and closing valve, a mechanical opening and closing valve, or a buoyancy control valve.

3. The hydraulic drive mechanism according to claim 1, characterized in that: The cross-sectional area S2 of the water outlet of the water inlet channel is smaller than the cross-sectional area S1 of the water inlet of the water inlet channel.

4. The hydraulic drive mechanism according to claim 1, characterized in that: The distance L between the water outlet of the water inlet channel and the water inlet of the hydraulic cylinder is ≥20 mm.

5. The hydraulic drive mechanism according to claim 1, characterized in that: The water outlet of the water inlet channel is provided with a diversion section.

6. The hydraulic drive mechanism according to claim 1, characterized in that: The cross-sectional dimension of the water outlet of the water inlet channel is substantially the same as the cross-sectional dimension of the water inlet of the hydraulic cylinder.

7. The hydraulic drive mechanism according to claim 1, characterized in that: A funnel guide structure is provided at the water inlet of the hydraulic cylinder, and the size of the funnel guide structure gradually decreases along the direction of the water flow. The cross-sectional size of the outer end of the funnel guide structure is larger than the cross-sectional size of the water outlet of the water inlet channel, and the cross-sectional size of the inner end of the funnel guide structure is approximately the same as the cross-sectional size of the water outlet of the water inlet channel.

8. The hydraulic drive mechanism according to claim 1, characterized in that: The reset member is an elastic member arranged in the hydraulic cylinder, and the water flow in the water inlet channel overcomes the elastic force of the elastic member to push the piston to move; the hydraulic cylinder is fixedly assembled with the main body; or, the hydraulic cylinder is independently arranged with the main body and is connected through a pipeline, and the water inlet end of the pipeline forms the water inlet of the hydraulic cylinder.

9. The hydraulic drive mechanism according to claim 1, characterized in that: The air partition is located in a water tank, and the water splashed from the air partition flows into the water tank.

10. A drainage device, comprising a drainage valve arranged in a water tank, characterized in that: It also includes the hydraulic drive mechanism according to any one of claims 1 to 9, wherein the piston is linked to the starting component of the drain valve to open the drain valve for drainage.

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