A combination valve for a distributed modular combined energy storage device

Abstract

The present invention discloses a combination valve for a distributed modular combined energy storage device. The externally controlled oil discharge one-way valve is provided, and the externally controlled oil discharge one-way valve includes a one-way valve and a pilot one-way valve. When storing energy, oil is pumped out from a hydraulic pump through a first channel into a second channel, and then into a liquid storage chamber of the energy storage device, thereby storing energy in the form of compressed inert gas. After the hydraulic pump stops working, the energy storage device is in an energy storage state. In this state, the high-pressure oil in the liquid storage chamber is connected to the second channel, and due to the action of the oil inlet one-way valve, the oil will not return to the first channel. The externally controlled oil discharge one-way valve seals and blocks the connection between the second channel and the third channel under the action of the pilot one-way valve core spring, the one-way valve spring, and the high-pressure oil, thereby preventing the oil from seeping into the third channel. That is, the combination valve has excellent internal sealing and anti-leakage capabilities, and can withstand the high pressure of the energy storage device during the energy storage process.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and in particular to a combination valve for a distributed module combination type energy storage device. 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] Existing hydraulic energy storage technology and production processes are relatively mature, with ample production capacity, making them easy to mass-produce and integrate. Existing hydraulic energy storage solutions require a two-position directional control valve assembly that can withstand high pressures and provide excellent leakage resistance to ensure smooth fluid flow, but no such product currently exists on the market. Summary of the Invention

[0006] The main purpose of the present invention is to provide a combination valve for a distributed modular combination energy storage device, aiming to solve the problem that some hydraulic energy storage solutions require a two-position directional control valve assembly that can withstand high pressure and has excellent anti-leakage ability.

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

[0008] A combination valve for a distributed modular combined energy storage device, comprising a valve body, a push rod, a pilot one-way valve core, a one-way valve core, a pilot one-way valve core spring, a pilot one-way valve core spring seat, a one-way valve spring, a first screw plug, and an oil inlet one-way valve; the push rod, the valve body, the pilot one-way valve core, the one-way valve core, the pilot one-way valve core spring, the pilot one-way valve core spring seat, the one-way valve spring, and the first screw plug constitute an externally controlled oil discharge one-way valve, and the push rod serves as a control element of the externally controlled oil discharge one-way valve;

[0009] The valve body is provided with a first channel, a second channel and a third channel; the second channel is connected to the third channel; the first channel is used to connect to the hydraulic pump; the oil inlet one-way valve is arranged between the first channel and the second channel so that the oil can only flow from the first channel to the second channel; the second channel is used to connect to the liquid storage chamber of the accumulator; the third channel is used to connect to the hydraulic motor; the externally controlled oil discharge one-way valve is used to open or seal and block the connection between the second channel and the third channel.

[0010] Preferably, the push rod is slidingly arranged on one side of the valve body; the valve body is provided with a first central through hole which passes through the second channel; the one-way valve core is slidingly fitted and embedded in the first central through hole, and the one-way valve core and the first central through hole form a dynamic seal; the first screw plug is detachably arranged at the end of the first central through hole away from the push rod, so as to seal the first central through hole; the one-way valve spring is provided between the first screw plug and the one-way valve core; the valve body is also provided with a transit channel which is respectively connected to the third channel and the first central through hole; the elastic force of the one-way valve spring causes the one-way valve core to abut against the junction of the transit channel and the first central through hole, so as to seal and block the connection between the second channel and the third channel.

[0011] Preferably, the push rod is used to drive the one-way valve core to move in a direction away from the transfer channel to open the communication between the second channel and the third channel.

[0012] Preferably, the one-way valve core is provided with a second through hole, a third through hole and an inner cavity which are connected in sequence; the second through hole is connected to the outside of the one-way valve core; the third through hole is located between the second through hole and the inner cavity; the inner cavity is closer to the first screw plug than the third through hole; the pilot one-way valve core spring seat is arranged in the inner cavity; the pilot one-way valve core is slidably embedded in the third through hole, and a dynamic seal is formed between the pilot one-way valve core and the third through hole; the aperture of the second through hole is smaller than the aperture of the third through hole; the pilot one-way valve core spring is arranged between the pilot one-way valve core spring seat and the pilot one-way valve core;

[0013] The one-way valve core also has a first communicating hole connected to the third central through hole; the pilot one-way valve core has an internal through groove, and one end of the internal through groove is connected to the inner cavity; the pilot one-way valve core also has a second communicating hole connected to the internal through groove; the elastic force of the pilot one-way valve core spring causes the pilot one-way valve core to abut against the junction of the second central through hole and the third central through hole to seal and isolate the second central through hole and the third central through hole; when the pilot one-way valve core abuts against the junction of the second central through hole and the third central through hole, one end of the pilot one-way valve movably penetrates and extends out of the second central through hole, and the first communicating hole is connected to the third central through hole; the push rod is also used to drive the pilot one-way valve core to move in a direction close to the pilot one-way valve core spring seat to open the connection between the second central through hole and the third central through hole and seal the first communicating hole.

[0014] Preferably, the pilot one-way valve core includes a protruding column, a tapered section and a main body section connected in sequence; the internal through groove and the second connecting hole are both arranged in the main body section; the protruding column is movably arranged to pass through and extend out of the second middle through hole; the tapered section is used to abut the junction of the second middle through hole and the third middle through hole.

[0015] Preferably, when the protruding column is movably arranged to penetrate and extend out of the second through hole, the protruding column is closer to the push rod than the one-way valve core.

[0016] Preferably, the push rod and the one-way valve core share a common central axis; the push rod and the pilot one-way valve core share a common central axis.

[0017] Preferably, it also includes an overflow valve; the valve body is also provided with an overflow channel connected to the first channel; the overflow valve is arranged in the overflow channel; the overflow valve includes a second plug screw, a plug spring seat, an overflow valve spring and an overflow valve core; the overflow valve is used to seal or open the overflow channel.

[0018] Preferably, it further includes an oil inlet seat; the oil inlet seat is arranged in the first channel.

[0019] Preferably, the valve body is further provided with a push rod hole communicating with the transfer channel, and the push rod seal is embedded in the push rod hole.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The combined valve for the distributed modular combined energy storage device proposed in the present invention is provided with an externally controlled oil discharge one-way valve, and the externally controlled oil discharge one-way valve includes a one-way valve and a pilot one-way valve. During energy storage, oil is pumped out of the hydraulic pump through the first channel into the second channel, and then into the liquid storage chamber of the energy storage device, thereby storing energy in the form of compressed inert gas. After the hydraulic pump stops working, the energy storage device is in an energy storage state. In this state, the high-pressure oil in the liquid storage chamber is connected to the second channel, and due to the action of the oil inlet one-way valve, the oil will not return to the first channel. In addition, the externally controlled oil discharge one-way valve seals and blocks the connection between the second channel and the third channel under the action of the pilot one-way valve core spring, the one-way valve spring, and the high-pressure oil, thereby preventing the oil from seeping into the third channel. That is, the combined valve has excellent internal sealing and anti-leakage capabilities, and can withstand the high pressure of the energy storage device during the energy storage process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is a structural schematic diagram of an embodiment of a combination valve for a distributed modular combination energy storage device proposed by the present invention.

[0024] Description of reference numerals:

[0025] 1. Push rod; 2. Valve body; 3. Pilot one-way valve core; 4. One-way valve core; 5. Pilot one-way valve core spring; 6. Pilot one-way valve core spring seat; 7. One-way valve spring; 8. First plug screw; 9. Plug spring seat; 10. Overflow valve spring; 11. Overflow valve core; 12. Oil inlet seat; 13. Steel ball; 14. Oil inlet one-way valve spring; 15. Oil inlet one-way valve spring seat; 16. Second channel; 17. First connecting hole; 18. Internal through groove; 19. Inner cavity; 20. First channel; 21. Second connecting hole; 22. Conical section; 23. Third channel; 24. Transfer channel; 25. Second through hole.

[0026] 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

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The present invention provides a combination valve for a distributed module combination type energy storage device.

[0033] Please refer to the attached Figure 1In one embodiment of a combination valve for a distributed modular combined energy storage device proposed by the present invention, the combination valve for the distributed modular combined energy storage device includes a valve body 2, a push rod 1, a pilot check valve core 3, a check valve core 4, a pilot check valve core spring 5, a pilot check valve core spring seat 6, a check valve spring 7, a first plug screw 8, and an oil inlet check valve; the push rod 1, valve body 2, pilot check valve core 3, check valve core 4, pilot check valve core spring 5, pilot check valve core spring seat 6, check valve spring 7, and first plug screw 8 constitute an externally controlled oil discharge check valve, and the push rod 1 serves as a control element of the externally controlled oil discharge check valve.

[0034] The valve body 2 is provided with a first channel 20, a second channel 16 and a third channel 23; the second channel 16 is connected to the third channel 23; the first channel 20 is used to connect to the hydraulic pump; the oil inlet check valve is arranged between the first channel 20 and the second channel 16, so that the oil can only flow from the first channel 20 to the second channel 16, that is, the oil cannot flow from the second channel 16 or the third channel 23 to the first channel 20; the second channel 16 is used to connect to the liquid storage chamber of the accumulator; the third channel 23 is used to connect to the hydraulic motor; the externally controlled oil discharge check valve is used to open or seal and block the connection between the second channel 16 and the third channel 23.

[0035] The distributed modular combined energy storage device proposed in the present invention is provided with a combination valve for a combined oil discharge device. The externally controlled oil discharge check valve includes a check valve and a pilot check valve. During energy storage, oil is pumped out of the hydraulic pump through the first channel 20 into the second channel 16 and then into the liquid storage chamber of the energy storage device, thereby storing energy in the form of compressed inert gas. After the hydraulic pump stops working, the energy storage device is in an energy storage state. In this state, the high-pressure oil in the liquid storage chamber is connected to the second channel 16, and due to the action of the oil inlet check valve, the oil will not return to the first channel 20. The externally controlled oil discharge check valve seals and blocks the connection between the second channel 16 and the third channel 23 under the action of the pilot check valve core spring 5, the check valve spring 7, and the high-pressure oil, thereby preventing the oil from seeping into the third channel 23. That is, the combination valve has excellent internal sealing and anti-leakage capabilities and can withstand the high pressure of the energy storage device during the energy storage process.

[0036] In addition, the push rod 1 is slidably arranged on one side of the valve body 2; the valve body 2 is provided with a first central through hole passing through the second through hole 16; the one-way valve core 4 is slidably fitted and embedded in the first central through hole, and the one-way valve core 4 forms a dynamic seal with the first central through hole; the first plug screw 8 is detachably arranged at the end of the first through hole away from the push rod 1, so as to seal the first through hole; a one-way valve spring 7 is arranged between the first plug screw 8 and the one-way valve core 4; the valve body 2 is also provided with a transit channel 24 respectively connecting the third channel 23 and the first central through hole; the transit channel 24 and the first central through hole share a central axis; the elastic force of the one-way valve spring 7 causes the one-way valve core 4 to abut against the junction of the transit channel 24 and the first central through hole to seal and block the connection between the second channel 16 and the third channel 23.

[0037] That is, in the energy storage state, the elastic force of the one-way valve spring 7 causes the one-way valve core 4 to abut against the junction of the transfer channel 24 and the first middle through hole to seal and block the communication between the second channel 16 and the third channel 23 .

[0038] At the same time, the push rod 1 is used to drive the one-way valve core 4 to move away from the transfer channel 24 to open the connection between the second channel 16 and the third channel 23. That is, when the energy is released, the push rod 1 moves to the right, driving the one-way valve core 4 to move away from the transfer channel 24 to open the connection between the second channel 16 and the third channel 23. At this time, the oil can enter the transfer channel 24 through the second channel 16, and then enter the third channel 23, and then enter the hydraulic motor to drive the hydraulic motor to generate electricity and feed back to the power grid.

[0039] It is worth noting that the outer diameter of the one-way valve core 4 near the transfer channel 24 is smaller than the inner diameter of the first through hole to ensure that the one-way valve core 4 does not seal and block the communication between the first channel 20 and the second channel 16.

[0040] In addition, the above-mentioned one-way valve core 4 is provided with a second central through hole 25, a third central through hole and an inner cavity 19 which are connected in sequence; the second central through hole 25 is connected to the outside of the one-way valve core 4; the third central through hole is located between the second central through hole 25 and the inner cavity 19; the inner cavity 19 is closer to the first screw plug 8 than the third central through hole; the pilot one-way valve core spring seat 6 is arranged in the inner cavity 19; the pilot one-way valve core 3 is slidingly embedded in the third central through hole, and a dynamic seal is formed between the pilot one-way valve core 3 and the third central through hole; the aperture of the second central through hole 25 is smaller than the aperture of the third central through hole; the pilot one-way valve core spring 5 is arranged between the pilot one-way valve core spring seat 6 and the pilot one-way valve core 3.

[0041] The one-way valve core 4 is further provided with a first communicating hole 17 communicating with the third central through hole; the pilot one-way valve core 3 is provided with an internal through groove 18 (the internal through groove 18 and the pilot one-way valve core 3 share a central axis), and one end of the internal through groove 18 is communicated with the inner cavity 19; the pilot one-way valve core 3 is further provided with a second communicating hole 21 communicating with the internal through groove 18; the elastic force of the pilot one-way valve core spring 5 causes the pilot one-way valve core 3 to abut against the junction of the second central through hole 25 and the third central through hole to seal the gap. The second through hole 25 and the third through hole are isolated; and when the pilot one-way valve core 3 abuts against the junction of the second through hole 25 and the third through hole, one end of the pilot one-way valve is movably penetrated and extends out of the second through hole 25, and the first communicating hole 17 is communicated with the third through hole; the push rod 1 is also used to drive the pilot one-way valve core 3 to move toward the direction close to the pilot one-way valve core spring seat 6, so as to open the communication between the second through hole 25 and the third through hole, and seal the first communicating hole 17.

[0042] Specifically, the pilot check valve core 3 comprises a protruding post, a tapered section 22, and a main body section, which are sequentially connected and share a common central axis. The internal through-slot 18 and the second communication hole 21 are both provided in the main body section. The protruding post flexibly extends through the second central through-hole 25. The tapered section 22 is configured to abut the junction of the second and third central through-holes. When the protruding post flexibly extends through the second central through-hole 25, the protruding post is closer to the push rod 1 than the check valve core 4.

[0043] Through the above technical solution, the structure and function of the combination valve for the distributed modular combination energy storage device are further improved; when storing energy, under the action of the pilot one-way valve core spring 5, the tapered section 22 abuts against the junction of the second through hole 25 and the third through hole, thereby sealing and isolating the second through hole 25 and the third through hole, and at this time the first connecting hole 17 is connected to the third through hole, then the high-pressure oil will enter the third through hole through the first connecting hole 17, and then fill the inner cavity 19, which is equivalent to the high-pressure oil filling the inner cavity 19 and the third through hole, then the one-way valve core 4 as a whole will be subjected to the pressure of the high-pressure oil, and this pressure enables the one-way valve core 4 to abut more tightly against the junction of the transfer channel 24 and the first through hole, greatly improving the internal sealing ability, and preventing the oil from entering the transfer channel 24 from the second through hole 25.

[0044] When releasing energy, the one-way valve core 4 has a large sealing force under the action of high-pressure oil. It is difficult to drive the one-way valve core 4 to move rightward to open the connection between the second channel 16 and the third channel 23 using the traditional driving method. The present solution can drive the one-way valve core 4 to move rightward more effortlessly. The specific working principle is as follows:

[0045] When energy needs to be released, the push rod 1 is pushed to the right, and the push rod 1 first contacts the protruding column, and then drives the pilot one-way valve core 3 to move to the right. Since the pilot one-way valve core 3 is easier to push than the one-way valve core 4, it can easily push the pilot one-way valve core 3 to move to the right. After moving, the tapered section 22 of the pilot one-way valve core 3 no longer abuts against the junction of the second through hole 25 and the third through hole, then the oil in the inner cavity 19 and the third through hole will enter the second through hole 25 through the second communicating hole 21, and finally enter the transfer channel 24, and the main section of the pilot one-way valve core 3 will seal the first communicating hole 17, then the high-pressure oil in the second channel 16 will no longer communicate with the second through hole 25 and the inner cavity 19, and the inner cavity 19 will be opened. The cavity 19 completes pressure relief, that is, the high-pressure oil no longer directly acts on the one-way valve core 4, and the sealing pressure on the one-way valve core 4 is greatly reduced (at this time, it is only affected by the force of the one-way valve spring 7 and is easier to push); when the protruding column is pushed to be completely retracted into the second middle through hole 25, the push rod 1 directly abuts against the one-way valve core 4, and the one-way valve core 4 can continue to be pushed to the right. Since the high-pressure oil no longer directly acts on the one-way valve core 4, the one-way valve core 4 can be pushed very labor-savingly. After being pushed to the right, the one-way valve core 4 no longer abuts the junction of the transfer channel 24 and the first middle through hole, the second channel 16 and the third channel 23 are connected, and the oil can be discharged through the third channel 23 to do work outward to achieve power generation.

[0046] Therefore, through the above technical solution, the combination valve used in the distributed modular combination energy storage device has the advantages of strong sealing ability and easy and labor-saving switching opening.

[0047] Specifically, the push rod 1 and the one-way valve core 4 share a central axis; the push rod 1 and the pilot one-way valve core 3 share a central axis. The combined valve for this distributed modular combined energy storage device also includes a relief valve; the valve body 2 further defines an relief passage communicating with the first passage 20; the relief valve is disposed within the relief passage; the relief valve includes a second screw plug, a screw plug spring seat 9, a relief valve spring 10, and a relief valve core 11; the relief valve is used to seal or open the relief passage. When the oil pressure in the first passage 20 exceeds a set safety value, the relief valve opens, allowing the oil to flow through the relief passage into the external oil tank, providing greater safety.

[0048] This distributed modular combined energy storage device combination valve also includes an oil inlet seat 12, which is located in the first channel 20. The valve body 2 also defines a push rod hole connected to the transfer channel 24, into which a push rod 1 (which can be an electric push rod) is sealably embedded. The oil inlet check valve includes a steel ball 13, an oil inlet check valve spring 14, and an oil inlet check valve spring seat 15.

[0049] Through the above technical solution, the structure and function of the combination valve for the distributed modular combination energy storage device are further improved.

[0050] 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 combination valve for a distributed modular combined energy storage device, characterized in that: It includes a valve body, a push rod, a pilot one-way valve core, a one-way valve core, a pilot one-way valve core spring, a pilot one-way valve core spring seat, a one-way valve spring, a first screw plug and an oil inlet one-way valve; the push rod, the valve body, the pilot one-way valve core, the one-way valve core, the pilot one-way valve core spring, the pilot one-way valve core spring seat, the one-way valve spring and the first screw plug constitute an externally controlled oil discharge one-way valve, and the push rod serves as a control element of the externally controlled oil discharge one-way valve; The valve body is provided with a first channel, a second channel, and a third channel; the second channel is connected to the third channel; the first channel is used to connect to the hydraulic pump; the oil inlet check valve is arranged between the first channel and the second channel so that the oil can only flow from the first channel to the second channel; the second channel is used to connect to the liquid storage chamber of the accumulator; the third channel is used to connect to the hydraulic motor; the externally controlled oil discharge check valve is used to open or seal and block the connection between the second channel and the third channel; and a valve core having a first end connected to the valve body and a second end connected to the valve body, wherein the valve core has a first end connected to the valve body and a second end connected to the valve body. The one-way valve core is provided with a second through hole, a third through hole and an inner cavity which are connected in sequence; the second through hole is connected to the outside of the one-way valve core; the third through hole is located between the second through hole and the inner cavity; the inner cavity is closer to the first screw plug than the third through hole; the pilot one-way valve core spring seat is arranged in the inner cavity; the pilot one-way valve core is slidably embedded in the third through hole, and a dynamic seal is formed between the pilot one-way valve core and the third through hole; the aperture of the second through hole is smaller than the aperture of the third through hole; the pilot one-way valve core spring is arranged between the pilot one-way valve core spring seat and the pilot one-way valve core; The one-way valve core also has a first communicating hole connected to the third central through hole; the pilot one-way valve core has an internal through groove, and one end of the internal through groove is connected to the inner cavity; the pilot one-way valve core also has a second communicating hole connected to the internal through groove; the elastic force of the pilot one-way valve core spring causes the pilot one-way valve core to abut against the junction of the second central through hole and the third central through hole to seal and isolate the second central through hole and the third central through hole; when the pilot one-way valve core abuts against the junction of the second central through hole and the third central through hole, one end of the pilot one-way valve movably penetrates and extends out of the second central through hole, and the first communicating hole is connected to the third central through hole; the push rod is also used to drive the pilot one-way valve core to move in a direction close to the pilot one-way valve core spring seat to open the connection between the second central through hole and the third central through hole and seal the first communicating hole.

2. A combination valve for a distributed modular combined energy storage device according to claim 1, characterized in that: The pilot one-way valve core includes a protruding column, a tapered section and a main body section connected in sequence; the internal through groove and the second connecting hole are both arranged in the main body section; the protruding column is movably arranged to pass through and extend out of the second middle through hole; the tapered section is used to abut the junction of the second middle through hole and the third middle through hole.

3. A combination valve for a distributed modular combined energy storage device according to claim 2, characterized in that: When the protruding column is movably arranged to penetrate and extend out of the second through hole, the protruding column is closer to the push rod than the one-way valve core.

4. A combination valve for a distributed modular combined energy storage device according to claim 1, characterized in that: The push rod and the one-way valve core share a central axis; the push rod and the pilot one-way valve core share a central axis.

5. A combination valve for a distributed modular combined energy storage device according to claim 1, characterized in that: It also includes an overflow valve; the valve body is also provided with an overflow channel connected to the first channel; the overflow valve is arranged in the overflow channel; the overflow valve includes a second screw plug, a screw plug spring seat, an overflow valve spring and an overflow valve core; the overflow valve is used to seal or open the overflow channel.

6. A combination valve for a distributed modular combined energy storage device according to claim 1, characterized in that: It also includes an oil inlet seat; the oil inlet seat is arranged in the first channel.

7. A combination valve for a distributed modular combined energy storage device according to claim 1, characterized in that: The valve body is further provided with a push rod hole communicating with the transfer channel, and the push rod seal is embedded in the push rod hole.

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