Piston cylinder energy store with a piston rod oil drain and a piston rod pressure boost

Abstract

The application discloses a piston rod oil discharge piston pressurized piston oil cylinder type energy accumulator, and can solve the problem that the air compression energy of the existing hydraulic piston type energy accumulator is too fast in pressure attenuation when releasing energy, and the actual energy storage rate is low; when releasing energy, the first reversing valve and the second reversing valve are asynchronously reversed, so that the second inner cavity is in a pressure relief state when the inert gas pressure is reduced to the set pressure, the pressure of the inert gas is directly applied on the piston rod, and is only used for pushing the piston rod to move downward, the piston rod extrudes the oil in the oil storage chamber and is discharged, drives the hydraulic motor after passing through the second reversing valve to generate electricity and feed back to the power grid, which is equivalent to increasing the pressure of the inert gas borne by the piston rod, can delay the decay speed of the air compression energy of the inert gas when releasing energy, and further increases the output pressure of the inert gas, so that the actual energy storage rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, in particular to a piston-cylinder type energy accumulator with a piston rod discharging oil and a piston pressurizing. Background Art

[0002] Developing new energy technologies is a major strategy for achieving sustainable human development, and various energy storage devices have become a crucial issue that must be addressed within this new energy strategy. Currently, there are two main types of mature new energy storage technologies: hydraulic energy storage and battery energy storage.

[0003] Hydropower storage technology has significant construction costs, relatively low stored energy density, and inefficient energy conversion. Electricity often requires long-distance transmission for use, and it can also cause irreversible environmental impacts in the reservoir's location. Therefore, it's unsuitable for existing power plants, offshore renewable energy power plants, or distributed energy storage applications.

[0004] Existing chemical batteries for energy storage suffer from short energy storage lifespans, high full-cycle costs, low response rates, and potential for overheating and explosion. Furthermore, the rare metals used in batteries are in limited supply, leading to significant costs for disassembly and environmental disposal after their use.

[0005] Relatively speaking, existing hydraulic energy storage technology and production processes are mature, with ample production capacity, making them easy to mass-produce and combine. However, a drawback of existing hydraulic energy storage technology is that the air compression energy of existing hydraulic piston accumulators decays too quickly during energy release, resulting in a low actual energy storage rate. Summary of the Invention

[0006] The main purpose of the present invention is to provide a piston-cylinder accumulator with piston rod oil discharge and piston pressurization, aiming to solve the problem that the air compression energy of the existing hydraulic piston accumulator decays too quickly when releasing energy, resulting in a low actual energy storage rate.

[0007] To achieve the above purpose, the technical solution proposed by the present invention is:

[0008] The accumulator is a piston-cylinder type accumulator with a piston rod discharging oil and a piston pressurizing, comprising a gas cylinder, a piston, a piston rod and an oil storage cylinder; the piston is arranged at one end of the piston rod; the piston is slidably fitted and embedded in the interior of the gas cylinder; the gas cylinder and the oil storage cylinder share a central axis; a central through hole is provided between the gas cylinder and the oil storage cylinder; the piston rod is slidably fitted and penetrates the central through hole to form a dynamic seal with the gas cylinder and the oil storage cylinder; the piston divides the interior space of the gas cylinder into a first inner cavity and a second inner cavity; the second inner cavity is closer to the oil storage cylinder than the first inner cavity; the piston rod and the oil storage cylinder are combined to form an oil storage chamber;

[0009] The first inner cavity is filled with inert gas; the second inner cavity is connected to the oil tank and the outlet end of the hydraulic pump respectively through the first reversing valve; the oil storage chamber is connected to the outlet end of the hydraulic pump and the inlet end of the hydraulic motor respectively through the second reversing valve.

[0010] Preferably, the gas storage cylinder and the oil storage cylinder are an integrated structure.

[0011] Preferably, it further comprises a cylinder cover; the cylinder cover is detachably connected to a side of the gas storage cylinder barrel facing away from the oil storage barrel.

[0012] Preferably, the cylinder head is provided with a charging valve.

[0013] Preferably, it also includes a piston rod bottom cover and an oil storage barrel bottom cover; the oil storage barrel bottom cover is detachably connected to the side of the oil storage barrel facing away from the gas storage cylinder; the inner bottom of the oil storage barrel bottom cover is funnel-shaped; the piston rod bottom cover is arranged at the end of the piston rod extending into the oil storage chamber; the end of the piston rod bottom cover close to the oil storage barrel bottom cover is in the shape of a cone that can be matched and embedded with the inner bottom of the oil storage barrel bottom cover.

[0014] Preferably, a first inlet and outlet hole communicating with the second inner cavity is formed on the side wall of the gas storage cylinder; the first inlet and outlet hole is connected to the first reversing valve through a pipeline.

[0015] Preferably, the bottom cover of the oil storage cylinder is provided with a second inlet and outlet hole connected to the oil storage chamber; the second inlet and outlet hole is connected to the second reversing valve through a pipeline.

[0016] Preferably, the piston and the piston rod are an integrated structure.

[0017] Preferably, the piston is detachably connected to one end of the piston rod.

[0018] Preferably, the first reversing valve and the second reversing valve are both solenoid valves.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The piston-cylinder accumulator with piston rod oil discharge and piston pressurization proposed in the present invention can solve the problem of the existing hydraulic piston accumulator that the air compressed energy decays too quickly during energy release, resulting in a low actual energy storage rate. Specifically, when releasing energy, the first reversing valve and the second reversing valve are synchronously reversed to put the second inner cavity in a pressure relief state. Then, the pressure of the inert gas directly acts on the piston rod and is only used to push the piston rod downward. The piston rod squeezes the oil in the oil storage chamber and discharges it. After flowing through the second reversing valve, it drives the hydraulic motor to generate electricity and feed back to the power grid. This is equivalent to increasing the pressure of the inert gas that the piston rod can withstand, which can slow down the decay rate of the air compressed energy of the inert gas during energy release, thereby increasing the output pressure of the inert gas and thus improving the actual energy storage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a structural schematic diagram of an embodiment of a piston-cylinder type accumulator with piston rod oil discharge and piston pressurization proposed by the present invention.

[0023] Description of reference numerals:

[0024] 1. Cylinder head; 2. Air reservoir cylinder; 3. Piston; 4. Piston rod; 5. Oil reservoir; 6. Piston rod bottom cover; 7. Oil reservoir bottom cover; 8. Inflating valve.

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0029] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides a piston-cylinder type energy accumulator with a piston rod discharging oil and a piston pressurizing.

[0032] Please refer to the attached Figure 1 In one embodiment of a piston-cylinder energy accumulator with piston rod oil discharge and piston pressurization proposed by the present invention, the piston-cylinder energy accumulator with piston rod oil discharge and piston pressurization includes an air cylinder 2, a piston 3, a piston rod 4 and an oil storage cylinder 5; the piston 3 is arranged at one end of the piston rod 4; the piston 3 is slidably embedded in the interior of the air cylinder 2; the air cylinder 2 and the oil storage cylinder 5 share a central axis; a central through hole is opened between the air cylinder 2 and the oil storage cylinder 5; the piston rod 4 is slidably penetrated through the central through hole to form a dynamic seal with the air cylinder 2 and a dynamic seal with the oil storage cylinder 5; the piston 3 divides the internal space of the air cylinder 2 into a first inner cavity and a second inner cavity; the second inner cavity is closer to the oil storage cylinder 5 than the first inner cavity; the piston rod 4 and the oil storage cylinder 5 are combined to form an oil storage chamber.

[0033] The first inner cavity is filled with an inert gas; in this embodiment, the inert gas is nitrogen; the second inner cavity is connected to the outlet end of the oil tank and the hydraulic pump respectively through the first reversing valve; the oil storage chamber is connected to the outlet end of the hydraulic pump and the inlet end of the hydraulic motor respectively through the second reversing valve; the hydraulic pump is driven by an electric motor; the hydraulic motor is used to drive a generator; the outlet end of the hydraulic motor and the inlet end of the hydraulic pump are both connected to the oil tank.

[0034] Working principle: In the initial state, the first inner cavity is filled with inert gas of set pressure. When energy storage is required, the excess electric energy from the outside drives the electric motor to work, and then drives the hydraulic pump to work; at this time, the first reversing valve controls the second inner cavity and the outlet end of the hydraulic pump to be connected, and the second reversing valve controls the oil storage chamber to be connected with the outlet end of the hydraulic pump; that is, the oil pumped out by the hydraulic pump can enter the second inner cavity and the oil storage chamber respectively; that is, the second inner cavity and the oil storage chamber jointly participate in the storage of energy, and jointly push the piston 3 to move upward to compress the inert gas, thereby increasing the energy storage power.

[0035] When energy needs to be released, the first reversing valve and the second reversing valve are both reversed. At this time, the second inner cavity is connected to the oil tank for pressure relief. The pressure of the inert gas is directly applied to the piston rod 4, and is all used to push the piston rod 4 downward (that is, it is only used to squeeze the oil in the oil storage chamber and discharge it to drive the hydraulic motor to generate electricity to supplement electricity to the external power grid). This is equivalent to increasing the pressure of the inert gas on the piston rod 4, which can slow down the decay rate of the air compression energy of the inert gas during energy release, thereby increasing the output pressure of the inert gas and thus increasing the actual energy storage rate. After the oil is completely discharged, the first reversing valve and the second reversing valve are reversed again, that is, restored to the initial state, thereby preparing for the next energy storage-release process.

[0036] The piston-rod oil-discharging piston-pressurized piston-cylinder accumulator proposed in the present invention can solve the problem of the existing hydraulic piston-type accumulator that the air compressed energy decays too quickly during energy release, resulting in a low actual energy storage rate. Specifically, when releasing energy, the first reversing valve and the second reversing valve are synchronously reversed to put the second inner cavity in a pressure relief state. Then, the pressure of the inert gas directly acts on the piston rod 4 and is only used to push the piston rod 4 downward. The piston rod 4 squeezes the oil in the oil storage chamber and discharges it. After flowing through the second reversing valve, it drives the hydraulic motor to generate electricity and feed back to the power grid. This is equivalent to increasing the pressure of the inert gas on the piston rod 4, which can slow down the decay rate of the air compressed energy of the inert gas during energy release, thereby increasing the output pressure of the inert gas, thereby improving the actual energy storage rate.

[0037] Furthermore, the gas cylinder 2 and oil reservoir 5 are integrally constructed (a separate, connected structure is also possible). This piston-oil-cylinder accumulator with piston rod oil displacement and piston pressure boosting also includes a cylinder head 1, which is detachably connected to the side of the gas cylinder 2 facing away from the oil reservoir 5. The cylinder head 1 is equipped with a charging valve 8 for charging inert gas.

[0038] At the same time, the piston-cylinder energy accumulator with piston rod oil discharge and piston pressurization also includes a piston rod bottom cover 6 and an oil storage barrel bottom cover 7; the oil storage barrel bottom cover 7 is detachably connected to the side of the oil storage barrel 5 facing away from the gas storage cylinder 2; the inner bottom of the oil storage barrel bottom cover 7 is funnel-shaped; the piston rod bottom cover 6 is arranged at the end of the piston rod 4 extending into the oil storage chamber; the end of the piston rod bottom cover 6 close to the oil storage barrel bottom cover 7 is in the shape of a truncated cone that can be matched and embedded with the inner bottom of the oil storage barrel bottom cover 7.

[0039] By setting the inner bottom of the oil reservoir bottom cover 7 to a funnel shape and setting the end of the piston rod bottom cover 6 close to the oil reservoir bottom cover 7 to a truncated cone shape that can be matched and embedded with the inner bottom of the oil reservoir bottom cover 7, the corresponding cross-sectional area can be reduced, and the pressure of the oil outlet of the oil reservoir 5 (that is, the subsequent second inlet and outlet hole) can be increased, thereby improving the energy storage output power.

[0040] In addition, the sidewall of the gas cylinder 2 defines a first inlet and outlet port that communicates with the second inner chamber; this first inlet and outlet port is connected to the first reversing valve via a pipe. The oil reservoir bottom cover 7 defines a second inlet and outlet port that communicates with the oil storage chamber; this second inlet and outlet port is connected to the second reversing valve via a pipe.

[0041] Specifically, the piston 3 and the piston rod 4 are an integrated structure (a split connection mechanism may also be adopted, for example, the piston 3 is detachably connected to one end of the piston rod 4).

[0042] At the same time, the first reversing valve and the second reversing valve are both solenoid valves. The central through hole is a circular through hole; the sliding direction of the piston 3 in the gas storage cylinder 2 is consistent with the central axis of the piston rod 4.

[0043] Through the above technical solution, the structure and function of the piston-cylinder type accumulator with piston rod oil discharge and piston pressurization are further improved.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A piston-cylinder accumulator with piston rod oil discharge and piston pressurization, characterized in that: The invention comprises an air storage cylinder, a piston, a piston rod and an oil storage cylinder; the piston is arranged at one end of the piston rod; the piston is slidably embedded in the interior of the air storage cylinder; the air storage cylinder and the oil storage cylinder share a central axis; a central through hole is provided between the air storage cylinder and the oil storage cylinder; the piston rod is slidably passed through the central through hole to form a dynamic seal with the air storage cylinder and the oil storage cylinder; the piston divides the internal space of the air storage cylinder into a first inner cavity and a second inner cavity; the second inner cavity is closer to the oil storage cylinder than the first inner cavity; the piston rod and the oil storage cylinder form an oil storage chamber in combination; The first inner cavity is filled with an inert gas; the second inner cavity is connected to the oil tank and the outlet of the hydraulic pump respectively through a first reversing valve; the oil storage chamber is connected to the outlet of the hydraulic pump and the inlet of the hydraulic motor respectively through a second reversing valve; The cam is connected to the oil reservoir bottom cover and the oil reservoir bottom cover is detachable and connected to the side of the oil reservoir facing away from the gas storage cylinder; the inner bottom of the oil reservoir bottom cover is funnel-shaped; the piston rod bottom cover is arranged at the end of the piston rod extending into the oil storage chamber; the end of the piston rod bottom cover close to the oil reservoir bottom cover is in the shape of a truncated cone that can be matched and embedded with the inner bottom of the oil reservoir bottom cover; the side wall of the gas storage cylinder is provided with a first inlet and outlet hole connected to the second inner cavity; the first inlet and outlet hole is connected to the first reversing valve through a pipeline.

2. A piston-cylinder type accumulator with piston rod oil discharge and piston pressurization according to claim 1, characterized in that: The gas storage cylinder and the oil storage cylinder are an integrated structure.

3. The piston-cylinder type accumulator with piston rod oil discharge and piston pressurization according to claim 1, characterized in that: It also includes a cylinder cover; the cylinder cover is detachably connected to a side of the gas storage cylinder barrel that faces away from the oil storage barrel.

4. The piston-cylinder type accumulator with piston rod oil discharge and piston pressurization according to claim 3, characterized in that: The cylinder head is provided with a charging valve.

5. The piston-cylinder type accumulator with piston rod oil discharge and piston pressurization according to claim 1, characterized in that: The bottom cover of the oil storage cylinder is provided with a second inlet and outlet hole which is in communication with the oil storage chamber; the second inlet and outlet hole is in communication with the second reversing valve through a pipeline.

6. The piston-cylinder type accumulator with piston rod oil discharge and piston pressurization according to claim 1, characterized in that: The piston and the piston rod are an integrated structure.

7. The piston-cylinder type accumulator with piston rod oil discharge and piston pressurization according to claim 1, characterized in that: The piston is detachably connected to one end of the piston rod.

8. The piston-cylinder type accumulator with piston rod oil discharge and piston pressurization according to claim 1, characterized in that: The first reversing valve and the second reversing valve are both solenoid valves.

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