WO2010072024A1

WO2010072024A1 - Hydraulic power plant

Info

Publication number: WO2010072024A1
Application number: PCT/CN2008/073653
Authority: WO
Inventors: 余俊均
Original assignee: Yu Chun Kwan
Priority date: 2008-12-22
Filing date: 2008-12-22
Publication date: 2010-07-01

Abstract

A hydraulic power plant (100) includes a first pressure cylinder (110) having a circular chamber (112), a first fluid inlet (120), a first fluid outlet (130) and a weight (150) having a first piston (152), the first piston is fit to the first pressure cylinder hermetically, and it can slide up and down in the first pressure cylinder. When the first piston slides down in the first pressure cylinder, liquid in the circular chamber can flow out through the first fluid outlet under the pressure of the first piston, so hydraulic power is output; when the first piston slide up in the first pressure cylinder, liquid can flow in the circular chamber through the first fluid inlet and prepare for the next hydraulic power output.

Description

Hydraulic power unit

Embodiments herein relate to a power plant, and more particularly to a hydraulic power unit that achieves hydraulic power output by means of less initial power or utilizing natural power. Background technique

Most of the existing hydraulic systems need to use hydraulic pumps or hydraulic motors to generate hydraulic pressure, which requires a large amount of electricity or fuel, which causes waste of energy.

In addition, the existing tidal power generation is to build a dam in the estuary or the bay to form a natural reservoir, and the hydroelectric generating unit is installed in the dam. Since the tidal range and the head change frequently in a day, there is an intermittent power generation in the absence of special adjustment measures, and the promotion and application are limited.

Therefore, there is a need for a hydraulic power unit that is environmentally friendly and energy efficient and that provides a consistently stable hydraulic pressure. Summary of the invention

To this end, the embodiments herein provide a hydraulic power unit that can achieve stable hydraulic power output with less initial power or with natural power.

In one embodiment, a hydraulic power unit is provided, comprising: a first pressure cylinder having a circular chamber; a first liquid inlet in fluid communication with a circular chamber of the first pressure cylinder, allowing liquid to pass from The first liquid inlet flows unidirectionally into the circular chamber; the first liquid outlet is in fluid communication with the circular chamber of the first pressure cylinder, allowing liquid to flow unidirectionally out of the circular chamber from the first liquid outlet; And a weight operable to perform ascending and descending movements, the weight having a first piston portion that is sealingly engaged with the first pressure cylinder and slidable up and down within the first pressure cylinder. When the weight is lowered, the first piston portion slides downward in the first pressure cylinder, and the liquid in the circular chamber flows out from the first liquid outlet under the pressure of the first piston portion to output hydraulic pressure. power. When the weight rises, the first piston portion slides upwardly within the first cylinder, and liquid flows from the first liquid inlet into the circular chamber to prepare for subsequent hydraulic power output.

Wherein the first liquid inlet is located at the bottom of the first pressure cylinder, and the first liquid outlet is opened A fluid single-way valve is disposed on the first piston portion at both the first liquid inlet and the first liquid outlet.

Further, the first liquid outlet may be connected to the hydraulic pipe, and the outlet end of the hydraulic pipe is disposed at the genset impeller, and the generated pressure liquid may push the impeller to rotate to generate electricity, and the position of the genset impeller is higher than the hydraulic pressure. powerplant.

The first liquid inlet is opened on the first piston portion, the first liquid outlet is located at the bottom of the first pressure cylinder, and the first liquid is recovered after the pressure liquid outputted from the first liquid outlet is externally worked. Near the inlet and collected on the first piston portion, when the first piston portion is raised, the first liquid inlet is opened, and liquid flows into the circular chamber.

In another embodiment, the hydraulic power unit further includes: a second pressure cylinder having a circular chamber; a second liquid inlet in fluid communication with the circular chamber of the second pressure cylinder, allowing liquid from the second The liquid inlet flows unidirectionally into the circular chamber; and the second liquid outlet is in fluid communication with the circular chamber of the second pressure cylinder, allowing liquid to flow unidirectionally out of the circular chamber from the second liquid outlet. The first piston portion is located at a lower portion of the weight, the weight further has a second piston portion at an upper portion thereof, the second piston portion is sealingly engaged with the second pressure cylinder and can slide up and down in the second pressure cylinder . When the weight rises, the second piston portion slides upward in the second pressure cylinder, and the liquid in the circular chamber flows out from the second liquid outlet under the pressure of the second piston portion to output hydraulic pressure. power. When the weight is lowered, the second piston portion slides downwardly within the second cylinder, and liquid flows from the second liquid inlet into the circular chamber to prepare for subsequent hydraulic power output.

Wherein, the hydraulic power device is disposed in a liquid container filled with a liquid, the first pressure cylinder and the second pressure cylinder are fixed relative to the liquid container, and the weight is in the form of a floating platform, and can float on the liquid surface .

Optionally, the liquid container is a sea, by means of fluctuations of tidal water of the sea, the weight is on itself or the liquid container is a pool separated by a sluice at the edge of the sea, the sluice controlling the pool as needed The connection and closure of the sea makes it possible to achieve a sufficient drop or rise of the weight through the slower liquid level fluctuations in the liquid container when the sea is rising or ebb.

Further, the hydraulic power unit further includes a float lifting mechanism disposed at a side of the weight, The float lifting mechanism includes: a rotatable member coupled to the weight for performing a rotational movement relative to the weight; and a float composed of a material having a density lower than the liquid, coupled to the rotatable member, and The rotation of the rotatable member is rotated from a first position generally below the weight to a second position substantially above the weight, and vice versa. When the float is rotated from the first position to the second position, the weight moves downward by the buoyancy of the float. When the float is rotated from the second position to the first position, the weight moves upward under the buoyancy of the float.

In one embodiment, the first liquid inlet and the first liquid outlet are both disposed at the bottom of the first pressure cylinder, and the first liquid outlet is when the first piston portion slides upward in the first pressure cylinder. Closing, the liquid flows into the circular chamber from the first liquid inlet under the suction generated by the upward sliding of the first piston portion to prepare for subsequent hydraulic power output.

In another embodiment, the second liquid inlet and the second liquid outlet are both disposed at the top of the second cylinder, and the second piston is slid downward in the second cylinder. The outlet is closed and the liquid flows from the second liquid inlet into the circular chamber under the suction generated by the downward sliding of the second piston portion to prepare for subsequent hydraulic power output.

The embodiments herein also provide a hydraulic power unit comprising: a pressure cylinder having a circular chamber; a liquid inlet in fluid communication with the circular chamber of the pressure cylinder, allowing liquid to flow unidirectionally from the liquid inlet a liquid outlet, in fluid communication with the circular chamber of the pressure cylinder, allowing liquid to flow unidirectionally out of the circular chamber from the liquid outlet; and a weight that is operatively opposed to the cylinder Movement, the weight has a piston portion at an upper portion thereof that is in sealing engagement with the pressure cylinder and is slidable up and down within the pressure cylinder. When the weight rises relative to the cylinder, the piston portion slides upward in the cylinder, and the liquid in the circular chamber flows out of the liquid outlet under the pressure of the piston portion to output hydraulic liquid power. When the weight is lowered relative to the cylinder, the piston portion slides downwardly within the cylinder and liquid flows from the liquid inlet into the circular chamber to prepare for subsequent hydraulic power output.

In another embodiment, the ascending and descending movement of the weight is achieved by a pontoon member comprising: two floating platforms floating above the liquid surface, the two floating stages being connected by a connecting piece And two support rods respectively hinged to the bottom of the weight and one of the floating platforms, each of the support rods being pivotable relative to the weight to which it is hinged and the floating platform. When the two floating stages are brought close to each other by tightening the connecting member, the two supporting rods work together to make the weight Rise. When the connecting piece between the two floating stages is released, the two floating stages are separated from each other under the weight of the weight, and the two supporting rods work together to lower the weight.

Optionally, the two support bars are arranged in an intersection, and the two are connected to each other by a hinge point. The hydraulic power unit according to the present invention provides a solution for environmentally friendly energy by using a small initial power or utilizing natural power to achieve a rise in weight, and then utilizing the natural gravity of the weight to achieve hydraulic power output. .

The hydraulic power device according to the present invention fully utilizes the feature of low resistance on the liquid surface, and adopts a labor-saving mechanism to realize the rise of the heavy object, on the one hand, the hydraulic pressure can be generated in the process of raising the heavy object, and on the other hand, the natural matter of the heavy object can be utilized. Gravity produces hydraulic pressure as the weight drops.

The hydraulic power unit according to the present invention exerts tidal water directly on the generator set in terms of utilizing tidal energy, unlike the prior art. Instead, the controllable weight rise and fall is achieved by the tidal fluctuations, which in turn produces a controllable hydraulic pressure. If necessary, hydraulic pressure can be applied to the impeller of the generator set to achieve stable and stable power generation. DRAWINGS

The invention will be described more specifically by way of examples with reference to the accompanying drawings, in which FIG.

1 is a schematic view showing a first embodiment of a hydraulic power unit according to the present invention; FIG. 2 is a schematic view showing a second embodiment of a hydraulic power unit according to the present invention; and FIG. 3 is a view showing a hydraulic pressure according to the present invention. A schematic view of a third embodiment of the power unit, wherein the weight is at the highest point of the rise;

Figure 4 shows the embodiment shown in Figure 3, in which the weight is at the lowest point of the drop;

Figure 5 is a schematic view showing a fourth embodiment of a hydraulic power unit according to the present invention; Figure 6 is a schematic view showing a fifth embodiment of the hydraulic power unit according to the present invention, wherein the weight is at the lowest point of the drop;

Fig. 7 shows the embodiment shown in Fig. 6, in which the weight is at the highest point of the rise; and Fig. 8 is a schematic view showing the sixth embodiment of the hydraulic power unit according to the present invention. detailed description Similar reference numerals are used in the drawings to identify similar components. For the sake of clarity, sometimes the same component appears in different views, but only in some views.

Referring to Figure 1, there is shown a schematic view of a first embodiment of a hydraulic power unit 100 in accordance with the present invention. The hydraulic power unit 100 includes: a pressure cylinder 110 having a circular chamber 112; a liquid inlet 120 in fluid communication with the circular chamber 112 of the pressure cylinder 110, which allows the liquid 160 to flow unidirectionally from the liquid inlet 120 into the circular chamber a chamber 112; a liquid outlet 130 in fluid communication with the circular chamber 112 of the pressure cylinder 110, which allows the liquid 160 to flow unidirectionally out of the circular chamber 112 from the liquid outlet 130; and a weight 150 operable to perform ascending and descending movements The weight 150 has a piston portion 152 that is in sealing engagement with the pressure cylinder 110 and is slidable up and down within the pressure cylinder 110. The liquid inlet 120 is located at the bottom of the first pressure cylinder 110, the liquid outlet 130 is formed on the piston portion 152, and fluid single-way valves 122, 132 are provided at both the liquid inlet 120 and the liquid outlet 130.

The hydraulic power unit 100 of the present embodiment operates as follows. When the weight 150 is lowered, the piston portion 152 slides downward in the pressure cylinder 110, and the liquid 160 in the circular chamber 112 is discharged from the liquid under the pressure of the piston portion 152. 130 flows out to output hydraulic power. As the weight 150 rises, the piston portion 152 slides upwardly within the pressure cylinder 110, and liquid flows from the liquid inlet 120 into the circular chamber 112 to prepare for subsequent hydraulic power output. The weight 150 naturally drops naturally under the action of gravity. After the weight 150 has dropped to the lowest point, a labor-saving machine such as a lever or a reduction pulley can be used to pull the weight 150 to the highest point in preparation for the next weight 150 down cycle. The weight of the weight 150 can be selected as desired, for example, a weight of one thousand tons. A seal 圏 (not shown) may be provided around the piston portion 152 to ensure a sealing fit between the piston portion 152 and the pressure cylinder 110.

When the weight 150 reaches a certain weight, the fluid flowing out from the liquid outlet 130 has a certain pressure and speed, the liquid outlet 130 can be connected to the hydraulic pipe 140, and the outlet end of the hydraulic pipe 140 is disposed on the genset impeller (not shown). At the same time, the impeller can be driven by hydraulic pressure to generate electricity. Of course, you can also use hydraulic pressure to do other work as needed, such as pushing the robot arm to work.

Referring to Figure 2, there is shown a schematic view of a second embodiment of a hydraulic power unit 200 in accordance with the present invention, which is substantially similar to the hydraulic power unit 100 of the first embodiment. The hydraulic power unit 200 also includes: a pressure cylinder 210 having a circular chamber 212; a liquid inlet 220; a liquid outlet 230; a hydraulic conduit 240 connected to the liquid outlet 230; and a weight having a piston portion 252 250. Also, a generator set 280 is provided at the outlet end of the hydraulic conduit 240. The generator set 280 includes a cavity (not shown) having a hydraulic inlet port 281 and a liquid outlet 282; a power wheel 284 rotatable within the cavity; and a plurality of impellers 283. The position of the hydraulic inlet port 281 is higher than the position of the outlet port 282, and the liquid entering from the hydraulic inlet port 281 is only on the same side of the vertical direction of the power wheel 284 before discharge. The location of the genset 280 is generally higher than the height of the hydraulic power unit 200.

The genset 280 cavity may employ a cylindrical cavity having a diameter that accommodates the power wheel 284 with the impeller 283 for rotation therein. The impeller 283 is hooked on the rim of the power wheel 284. The power wheel 284 can also be connected to a power output device such as a gear mechanism to perform power output through the power output device.

The difference is that the liquid inlet 220 is opened on the piston portion 252, and the liquid inlet is provided with an opening 222. The liquid outlet 230 is located at the bottom of the pressure cylinder 210. After the pressure liquid 260 output from the liquid outlet 230 is externally worked, it is recovered to the vicinity of the liquid inlet 220 and collected on the piston portion 252. When the piston portion 252 is lifted by an external force, the opening and closing cover 222 is opened, and the liquid 260 flows from the liquid inlet 220. Round chamber. Prepare for the next hydraulic output cycle.

Referring to Figures 3 and 4 together, a schematic view of a second embodiment of a hydraulic power unit 300 in accordance with the present invention is shown. The hydraulic power unit 300 includes: a first pressure cylinder 310 having a circular chamber 312, a first liquid inlet 315 and a first liquid outlet 316 at the bottom of the first pressure cylinder 310; and a second chamber having a circular chamber 332 a pressure cylinder 330 having a second liquid inlet 335 and a second liquid outlet 336 at the top of the second pressure cylinder 330; a weight 350 operable to ascend and descend, the weight 350 having a lower portion of the first piston portion 352 and a second piston portion 354 located at an upper portion thereof, the first piston portion 352 is sealingly engaged with the first pressure cylinder 310 and slidable up and down within the circular chamber 312, and the second piston portion 354 is sealingly engaged with the second pressure cylinder 330 and Slide up and down within the circular chamber 332; and a float lift mechanism (not labeled) disposed on the side of the weight 350, the float lift mechanism includes a rotatable member 390 and a float 392 coupled to the rotatable member.

The hydraulic power unit 300 is disposed in a liquid container 370 filled with a liquid 360, and the first cylinder 310 and the second cylinder 330 are fixed in position relative to the liquid container 370. The weight 350 is in the form of a floating platform that floats on the liquid surface.

The rotatable member 390 is disposed on both sides of the weight 350, is coupled to the weight 350 and is rotatable relative to the weight 350. The float 392 consists of a material that is less dense than liquid and can be rotated The rotation of member 390 is rotated from a first position generally below weight 350 to a second position generally above weight 350, and vice versa.

The operation of the hydraulic power unit 300 of the present embodiment will be described below with reference to Figs. 3 and 4. The weight 350 shown in Fig. 3 is at the highest point of the rise, at which time the float 392 is at the first position at the bottom of the weight 350. Since the float 392 is all below the liquid level, its buoyancy is the highest, making the weight 350 rise the highest. At the same time, the first piston portion 352 and the second piston portion 354 are located at the uppermost ends of the respective pressure cylinders 310, 330. As the rotatable member 390 causes the float 392 to gradually expand from the first position toward the sides of the weight 350, the partial float 392 gradually exposes the liquid level, and the buoyancy of the weight 350 is correspondingly reduced. Therefore, the floating weight 350 will cause the first piston portion 352 and the second piston portion 354 to gradually descend. The lowering of the first piston portion 352 within the first pressure cylinder 310 forces the pressurized liquid to flow out of the first liquid outlet 316. The lowering of the second piston portion 354 within the second cylinder 330 draws the working fluid into the circular chamber 332 of the second cylinder 330 via the second liquid inlet 335. As shown in FIG. 4, when the float 392 is rotated to the second position at the uppermost position of the weight 350, the weight 350 is lowered to the lowest point, while the first piston portion 352 and the second piston portion 354 are both located in the corresponding pressure cylinder 310, The lowermost end of 330.

As the rotatable member 390 drives the float 392 to gradually disperse from the second position toward the sides of the weight 350, a portion of the float 392 gradually enters the liquid level, and the buoyancy of the weight 350 increases accordingly. Therefore, the floating weight 350 will drive the first piston portion 352 and the second piston portion 354 to rise step by step. The rise of the first piston portion 352 within the first cylinder 310 draws the working fluid into the circular chamber 312 of the first cylinder 310 via the first liquid inlet 315. The rise of the second piston portion 354 within the second pressure cylinder 330 forces the pressurized liquid to flow out of the second liquid outlet 336. As shown in Figure 3, when the float 392 is rotated to the first position at the bottom of the weight 350, the weight 350 rises to the highest point. Further, similar to that shown in Fig. 2, a genset impeller or other hydraulic force receiving mechanism may be provided adjacent to the first liquid outlet 316 and the second liquid outlet 336 to effect hydraulic external work.

It should be noted that, in this embodiment, two sets of float lifting mechanisms are schematically shown, which are distributed on both sides of the weight. However, it is not limited thereto, and for example, a plurality of sets of float lifting mechanisms may be provided around the weight as needed. And the number and size of the floats can be adjusted according to the weight of the weight and the actual required hydraulic output.

Please refer to FIG. 5, which shows a fourth embodiment of a hydraulic power unit 300 according to the present invention. Schematic, which is substantially similar to the hydraulic power unit 300 of the third embodiment. The difference is that the hydraulic power unit 300 of the embodiment eliminates the float lifting mechanism. The hydraulic power unit 300 is disposed at a pool 370 separated by a water gate 320 at the edge of the sea 321 . The water gate 320 can control the pool 370 to communicate and close with the sea 321 as needed. The weight 350 is placed in the form of a floating platform so that it can float on the sea surface.

Next, the operation of the hydraulic power unit 300 of this embodiment will be described. When the seawater rises to the level A identified in Figure 5, the pool 370 is connected to the sea 321 and the weight in the pool 370 rises with the tide. When the seawater ebbs to the level B identified in Figure 5, the weight in the pool 370 will decrease with the tide. As mentioned above, the rise and fall of the weight can drive the hydraulic power unit 300 to perform work externally. This is not repeated here.

When the tide rises and falls too fast, there will be cases where the lifting of the heavy objects is not synchronized with the tide. That is, when the weight has not risen to the highest point, that is, when the tide is reached, or when the weight has not dropped to the lowest point, the tide is encountered. This will lead to incomplete use of tidal energy. At this time, the water gate 320 can be used to buffer the lifting speed of the inner surface of the pool 370. For example, when the tide rises and falls too fast, the pool 370 can be isolated from the sea by the water gate 320. When the subsequent weight is raised and lowered to the proper position, the water gate 320 is partially opened, so that the tank 370 can be sufficiently lowered or raised by the slower liquid level fluctuation. In addition, when the tide rises and falls unstable, the weight can still be continuously and steadily raised and lowered by the water gate 320.

Referring to Figures 6 and 7, together, a schematic view of a fifth embodiment of a hydraulic power unit 400 in accordance with the present invention is shown. The present hydraulic power unit 400 includes: a pressure cylinder 410 having a circular chamber 412 having a liquid inlet 420 and a liquid outlet 430; a weight 450 operable to perform ascending and descending movements, the weight 450 having therein The upper piston portion 452, the piston portion 452 is in sealing engagement with the pressure cylinder 410 and is slidable up and down within the pressure cylinder 410; a pontoon member (not shown) for controlling the lifting and lowering of the weight 450. The pontoon member comprises: two floating platforms 460 floating above the liquid surface, the two floating platforms 460 are connected by a connecting member 470; and two supporting rods 440 respectively hinged to the bottom of the weight 450 and one of the floating tables 460 Each of the support rods 440 is pivotable relative to its hinged weight 450 and pontoon 460.

Next, the operation of the hydraulic power unit 400 of this embodiment will be described. Referring to FIG. 6 and FIG. 7, when the connecting member 470 is tightened and the two floating platforms 460 are brought close to each other, the two supporting rods 440 cooperate to cause the weight 450 to rise, and the piston portion 452 slides upward in the pressure cylinder 410. , circular cavity The liquid in the chamber 412 flows out of the liquid outlet 430 under the pressure of the piston portion 452 to output hydraulic liquid power. When the connecting member 470 between the two floating tables 460 is released, the two floating tables 460 are separated from each other under the pressure of the weight 450, and the two supporting rods 440 cooperate to lower the weight 450, and the piston portion 452 is in the pressure cylinder. The 410 slides downwardly and liquid flows from the liquid inlet 420 into the circular chamber 412 to prepare for subsequent hydraulic power output.

Referring to Figure 8, there is shown a schematic view of a sixth embodiment of a hydraulic power unit 400 in accordance with the present invention, which is substantially similar to the hydraulic power unit 400 of the fifth embodiment. The difference is that the two support rods 442 of the hydraulic power unit 400 of the present embodiment are disposed in a crosswise manner, and the two are connected to each other through a hinge point.

Further, in the hydraulic power unit 400 of the present embodiment, the float lifting mechanism shown in Fig. 3 can be used to lift and lower the weight. Additionally, it should be noted that although the embodiments herein refer to the piston reciprocating in a fixed pressure cylinder. However, it should not be limited to this. It is also possible to fix the piston and connect the pontoon member or the float lifting mechanism to the pressure cylinder so that the pressure cylinder moves up and down with respect to the piston to achieve the same function.

The terms "upper", "lower", "left", "right" and the like used in this document are relative and are used for convenience of description. If the viewing point is changed in different applications, the above orientation words also need to be changed accordingly.

The various preferred embodiments of the present invention have been described hereinabove with reference to the accompanying drawings, and modifications and changes in the form of the present invention can be made by those skilled in the art without departing from the spirit and scope of the invention. range.

Claims

Claim

A hydraulic power unit comprising:

a first pressure cylinder having a circular chamber;

a first liquid inlet in fluid communication with the circular chamber of the first cylinder, allowing liquid to flow unidirectionally from the first liquid inlet into the circular chamber;

a first liquid outlet in fluid communication with the circular chamber of the first pressure cylinder, allowing liquid to flow unidirectionally out of the circular chamber from the first liquid outlet;

A weight that is operable to perform ascending and descending motion, the weight having a first piston portion, the first piston portion sealingly mating with the first pressure cylinder and slidable up and down within the first pressure cylinder, wherein When the weight is lowered, the first piston portion slides downward in the first pressure cylinder, and the liquid in the circular chamber is under the pressure of the first piston portion from the first The liquid outlet flows out to output hydraulic power,

When the weight rises, the first piston portion slides upward in the first pressure cylinder, and liquid flows from the first liquid inlet into the circular chamber to prepare for subsequent hydraulic power output. .

2. The hydraulic power unit according to claim 1, wherein the first liquid inlet is located at a bottom of the first pressure cylinder, and the first liquid outlet is opened on the first piston portion, A fluid single-way valve is provided at both the first liquid inlet and the first liquid outlet.

3. The hydraulic power unit according to claim 1, wherein the first liquid outlet is connected to a hydraulic pipe, and the outlet end of the hydraulic pipe is disposed at a genset impeller, and the position of the genset impeller is generally higher than The hydraulic power unit.

4. The hydraulic power unit according to claim 3, wherein: the first liquid inlet is opened on the first piston portion, and the first liquid outlet is located at a bottom of the first pressure cylinder, from the After the first liquid outlet is raised, the first liquid inlet is opened, and the first liquid inlet is opened, Liquid flows into the circular chamber.

5. The hydraulic power unit according to claim 1, wherein

The hydraulic power unit further includes: a second pressure cylinder having a circular chamber;

a second liquid inlet in fluid communication with the circular chamber of the second cylinder, allowing liquid to flow unidirectionally from the second liquid inlet into the circular chamber;

a second liquid outlet in fluid communication with the circular chamber of the second pressure cylinder, allowing liquid to flow unidirectionally out of the circular chamber from the second liquid outlet,

The first piston portion is located at a lower portion of the weight, the weight further has a second piston portion at an upper portion thereof, the second piston portion is sealingly engaged with the second pressure cylinder and is Two pressure cylinders slide up and down,

Wherein, when the weight rises, the second piston portion slides upward in the second pressure cylinder, and the liquid in the circular chamber is under the pressure of the second piston portion from the first Two liquid outlets flow out to output hydraulic power;

When the weight is lowered, the second piston portion slides downward in the second cylinder, and liquid flows from the second liquid inlet into the circular chamber to prepare for subsequent hydraulic power output. .

6. The hydraulic power unit according to claim 5, wherein the hydraulic power unit is disposed in a liquid container filled with a liquid, and the positions of the first pressure cylinder and the second pressure cylinder relative to the liquid container Fixed, the weight is in the form of a floating platform, which can float on the liquid surface.

7. The hydraulic power unit according to claim 6, wherein the liquid container is a sea, and the heavy object is lowered and raised by the combined force of its own gravity and liquid buoyancy by means of the fluctuation of the tide of the sea. .

8. The hydraulic power unit according to claim 6, wherein the liquid container is a pool partitioned by a water gate at an edge of the sea, the water gate controlling communication and closing of the pool and the sea as needed, When the tide of the sea rises or falls rapidly or the tide rises and falls, the slow drop of the liquid level in the liquid container can still achieve sufficient drop or rise of the weight.

9. The hydraulic power unit according to claim 6, wherein the hydraulic power unit further includes a float lifting mechanism provided on a side of the weight, the float lifting mechanism comprising:

a rotatable member coupled to the weight for rotational movement relative to the weight; and a float comprised of a material having a density less than the liquid, coupled to the rotatable member, and Rotating from a first position substantially below the weight to a second position substantially above the weight, and vice versa, by rotation of the rotatable member,

When the float rotates from the first position to the second position, the weight moves downward under the action of the buoyancy of the float,

When the float is rotated from the second position to the first position, the weight moves upwardly under the action of the buoyancy of the float.

10. The hydraulic power unit according to claim 5, wherein

The first liquid inlet and the first liquid outlet are both disposed at a bottom of the first pressure cylinder, and the first liquid outlet is when the first piston portion slides upward in the first pressure cylinder Closing, the liquid flows into the circular chamber from the first liquid inlet under the suction generated by the upward sliding of the first piston portion to prepare for subsequent hydraulic power output.

11. The hydraulic power unit according to claim 5, wherein

The second liquid inlet and the second liquid outlet are both disposed at the top of the second pressure cylinder, and the second liquid outlet is when the second piston portion slides downward in the second pressure cylinder Closing, the liquid flows into the circular chamber from the second liquid inlet under the suction generated by the downward sliding of the second piston portion to prepare for subsequent hydraulic power output.

12. A hydraulic power unit comprising:

a pressure cylinder having a circular chamber;

a liquid inlet in fluid communication with the circular chamber of the pressure cylinder, allowing liquid to flow unidirectionally from the liquid inlet into the circular chamber;

a liquid outlet in fluid communication with the circular chamber of the cylinder, permitting liquid to flow unidirectionally out of the circular chamber from the liquid outlet;

a weight, the weight and the pressure cylinder are operatively movable up and down relative to each other, the weight having a piston portion at an upper portion thereof, the piston portion sealingly engaging the pressure cylinder and being opposite to the pressure cylinder Slide up and down,

Wherein, when the weight rises relative to the pressure cylinder, the piston portion slides upward in the pressure cylinder, and the liquid in the circular chamber is discharged from the liquid under the pressure of the piston portion Flow out to output hydraulic fluid power;

The piston portion slides downward in the pressure cylinder when the weight is lowered relative to the pressure cylinder The liquid flows from the liquid inlet into the circular chamber to prepare for subsequent hydraulic power output.

13. The hydraulic power unit according to claim 12, wherein the ascending and descending movement of the weight is achieved by a pontoon member, the pontoon member comprising:

Two floating platforms floating above the liquid surface, the two floating platforms being connected by a connecting member; and two support rods respectively hinged between the bottom of the weight and one of the floating platforms, each Each of the support rods is pivotable relative to the weight and the pontoon.

Wherein, when the connecting member is tensioned to bring the two floating platforms closer to each other, the two supporting rods cooperate to cause the weight to rise,

When the connecting member between the two floating stages is released, the two floating stages are separated from each other under the weight of the weight, and the two supporting rods cooperate to cause the weight to descend.

14. The hydraulic power unit according to claim 13, wherein the two support bars are disposed in an intersecting manner, and the two are connected to each other by a hinge point.

15. The hydraulic power unit according to claim 12, wherein the hydraulic power unit further includes a float lifting mechanism provided on a side of the weight, the float lifting mechanism comprising:

a rotatable member coupled to the weight for rotational movement relative to the weight; and a float comprised of a material having a density less than the liquid, coupled to the rotatable member, and The rotation of the rotatable member is rotated from a first position substantially below the weight to a second position substantially above the weight, and vice versa,