Liquid energy recovery device, energy recovery method and energy recovery system

Abstract

The invention discloses a liquid energy recovery device, an energy recovery method and an energy recovery system, and belongs to the technical field of energy recovery. The liquid energy recovery device includes a first housing, a second housing, and a double diaphragm assembly. The first shell is provided with a first cavity, a first inlet and a first outlet; the second shell is provided with a second cavity, a second inlet and a second outlet; the double-diaphragm assembly comprises a first diaphragm, a second diaphragm and a connecting rod, the first diaphragm and the second diaphragm are arranged at the two ends of the connecting rod respectively, and the first diaphragm and the second diaphragm are located in the first cavity and the second cavity respectively; wherein the first diaphragm divides the first chamber into a pressurizing chamber and a first buffer space which are isolated from each other; the second diaphragm divides the second cavity into a pressure relief cavity and a second buffer space which are isolated from each other. According to the liquid energy recovery device, mixing of different kinds of liquid can be avoided, and the temperature of the liquid in the pressure relief cavity and the temperature of the liquid in the pressurization cavity can be isolated.

Description

Technical Field

[0001] This application relates to the field of energy recovery technology, and in particular to a liquid energy recovery device, energy recovery method and energy recovery system. Background Technology

[0002] Against the backdrop of an increasingly severe global energy crisis and environmental problems, energy conservation and emission reduction have become a core component of my country's energy development strategy and a key measure to achieve the goal of "carbon neutrality." In many industrial processes, such as reverse osmosis seawater desalination, petrochemical refining, and steel smelting, large quantities of high-pressure liquids (such as reverse osmosis brine and reactor feed) need to be discharged or depressurized. These liquids typically still have high pressure (for example, in a reverse osmosis seawater desalination system, the pressure of the concentrated seawater discharged from the membrane module is still as high as 4.8~5.8 MPa). If the pressure energy contained within them is directly dissipated through pressure reducing valves, it will not only be a huge waste of energy but also increase the system's operating costs and environmental burden. Therefore, developing efficient liquid energy recovery devices to recover and reuse residual pressure liquid energy has become an important research direction in the field of industrial energy conservation.

[0003] In related technologies, liquid energy recovery devices are mainly divided into two categories based on their working principle: hydraulic turbine type and power exchange type. Hydraulic turbine type liquid energy recovery devices convert the pressure energy of high-pressure fluid into the mechanical energy of turbine rotation, and then further convert it into other forms of energy. However, hydraulic turbine type liquid energy recovery devices have relatively low energy recovery efficiency, typically only 70%~80%; they also have poor adaptability to operating conditions, easily experiencing problems such as speed fluctuations, unstable output power, and vibration when operating conditions deviate from optimal conditions, affecting system stability. Power exchange type liquid energy recovery devices, based on Pascal's principle, realize direct pressure energy transfer between high and low pressure liquids. The energy conversion path is pressure energy to pressure energy, reducing energy loss in intermediate conversion stages, and the recovery efficiency can reach 90%~96%, making it a key area of ​​research and promotion. Based on different fluid switching structures, power exchange type liquid energy recovery devices can be divided into rotor type and hydraulic cylinder type, but both types still have their own drawbacks. While rotor-type liquid energy recovery devices are widely used in the reverse osmosis seawater desalination industry, they suffer from liquid mixing and overflow, leading to a 2% to 5% decrease in recovery efficiency. Furthermore, their applicability is limited to reverse osmosis seawater desalination and cannot meet the diverse needs of other industrial scenarios. Hydraulic cylinder-type liquid energy recovery devices use pistons as reciprocating components, requiring extremely high sealing performance; however, piston wear can also cause liquid mixing. Summary of the Invention

[0004] This application provides a liquid energy recovery device, energy recovery method, and energy recovery system, which can not only isolate the liquid in the pressure relief chamber and the pressure boosting chamber, thereby avoiding the mixing of different liquids, but also isolate the temperature of the liquid in the pressure relief chamber and the pressure boosting chamber.

[0005] To achieve the above objectives, according to a first aspect of this application, a liquid energy recovery device is provided, comprising: A first housing, the first housing having a first chamber, a first inlet and a first outlet; The second housing has a second chamber, a second inlet, and a second outlet; A dual-diaphragm assembly, comprising a first diaphragm, a second diaphragm, and a connecting rod, wherein the first diaphragm and the second diaphragm are respectively disposed at both ends of the connecting rod, and the first diaphragm and the second diaphragm are respectively located in the first chamber and the second chamber; The first diaphragm divides the first chamber into a pressurized chamber and a first buffer space that are isolated from each other, and the first inlet and the first outlet are respectively connected to the pressurized chamber; The second diaphragm divides the second chamber into a mutually isolated pressure relief chamber and a second buffer space, and the second inlet and the second outlet are respectively connected to the pressure relief chamber.

[0006] Optionally, the liquid energy recovery device further includes a third housing, the third housing having a third chamber, a portion of the connecting rod being located in the third chamber, both ends of the third housing being connected to the first housing and the second housing respectively, and the third chamber being connected to the first buffer space and the second buffer space respectively.

[0007] Optionally, a support portion is provided in the third chamber, the support portion being disposed on the outer periphery of the connecting rod, the support portion being used to guide and limit the connecting rod.

[0008] Optionally, the first inlet and the first outlet are respectively provided with a first control valve and a second control valve, the first control valve having a first opening pressure and the second control valve having a second opening pressure, wherein the first opening pressure is less than the second opening pressure. The first control valve is configured to open when the pressure in the pressurization chamber is lower than the pressure at the first inlet, and the second control valve is configured to open when the pressure in the pressurization chamber is higher than the pressure at the first outlet.

[0009] Optionally, the second inlet and the second outlet are respectively provided with a third control valve and a fourth control valve; The liquid energy recovery device further includes a position detection component and a control unit. The position detection component is used to detect the positions of the first diaphragm and the second diaphragm. The control unit controls the third control valve and the fourth control valve to open or close based on the signal fed back by the position detection component.

[0010] Optionally, the position detection component includes a first sensor, a second sensor, and a sensing element; Wherein, the first sensor is disposed near the first housing, and the second sensor is disposed near the second housing; when the sensing element is disposed on the connecting rod and moves synchronously with the connecting rod, the positions of the first sensor and the second sensor remain unchanged; or... The first sensor is positioned close to the second housing, and the second sensor is positioned close to the first housing. Both the first and second sensors are located on the connecting rod. When the first and second sensors move synchronously with the connecting rod, the position of the sensing element remains unchanged.

[0011] Optionally, the control unit is configured to: When the sensing element senses the first sensor, the third control valve is closed and the fourth control valve is opened. When the sensor and the second sensor sense each other, the third control valve is opened and the fourth control valve is closed.

[0012] Optionally, the force-bearing area of ​​the first diaphragm is S1, the pressure of the liquid in the pressurization chamber is P1, the force-bearing area of ​​the second diaphragm is S2, and the pressure of the liquid in the depressurization chamber is P2, satisfying: P1*S1=P2*S2.

[0013] Optionally, with the force-bearing area S2 of the second diaphragm and the pressure P2 of the liquid in the pressure relief chamber remaining unchanged, when the force-bearing area S1 of the first diaphragm is increased, the pressure of the liquid in the pressure-boosting chamber decreases and the flow rate of the liquid discharged through the first outlet increases; when the force-bearing area S1 of the first diaphragm is decreased, the pressure of the liquid in the pressure-boosting chamber increases and the flow rate of the liquid discharged through the first outlet decreases.

[0014] Optionally, both the first diaphragm and the second diaphragm are made of polytetrafluoroethylene composite elastic material or stainless steel and carbon fiber reinforced layer composite material.

[0015] According to a second aspect of this application, an energy recovery method is provided, employing a liquid energy recovery device as described in any one of the above claims, the energy recovery method comprising: When the dual diaphragm assembly moves to the first preset position, low-pressure liquid enters the pressurization chamber through the first inlet and pushes the dual diaphragm assembly to move toward the second housing, and the liquid in the pressure relief chamber is discharged through the second outlet; When the dual diaphragm assembly moves to the second preset position, high-pressure liquid enters the pressure relief chamber through the second inlet and pushes the dual diaphragm assembly to move towards the first housing, thereby pressurizing the low-pressure liquid in the pressurization chamber. The pressurized liquid in the pressurization chamber is then discharged through the first outlet.

[0016] According to a third aspect of this application, an energy recovery system is also provided, comprising a plurality of liquid energy recovery devices as described in any one of the above, wherein the plurality of liquid energy recovery devices are connected in parallel.

[0017] Optionally, the energy recovery system further includes a first main pipe and a second main pipe, the first main pipe being connected to a plurality of first inlets, and the second main pipe being connected to a plurality of first outlets; and / or, The energy recovery system also includes a third main pipe and a fourth main pipe, the third main pipe being connected to a plurality of second inlets and the fourth main pipe being connected to a plurality of second outlets.

[0018] Optionally, the energy recovery system further includes an energy storage device connected to the first main pipe; and / or, The energy recovery system also includes a control system for coordinating the operating timing of the multiple liquid energy recovery devices.

[0019] In the liquid energy recovery device, method, and system of this application, a double-diaphragm structure is adopted. The pressure energy of the high-pressure liquid can be directly transferred to the low-pressure liquid via the second diaphragm, connecting rod, and first diaphragm. This shortens the energy conversion path, reduces energy loss in intermediate stages, and achieves a recovery efficiency of over 90%, higher than that of a hydraulic turbine device. The first diaphragm divides the first chamber into an isolated pressurization chamber and a first buffer space, while the second diaphragm divides the second chamber into an isolated depressurization chamber and a second buffer space. The first and second diaphragms isolate the liquids in the depressurization chamber and pressurization chamber, preventing the mixing of different liquids and enabling the conversion of pressure energy between different liquids. For example, it can be applied to recovering residual pressure energy from particulate slurries, corrosive and toxic liquids, expanding the applicability of the liquid energy recovery device. Simultaneously, the first and second diaphragms constitute a double safety barrier. When one diaphragm ruptures due to fatigue or accident, the other diaphragm can still maintain the system's isolation function, preventing safety accidents caused by the mixing of liquids from both sides. Furthermore, the first buffer space, the second buffer space, and the third chamber together form an isolation space, which can isolate the temperature of the liquid in the pressure relief chamber and the pressure boosting chamber, thereby preventing the liquid in the pressure relief chamber and the pressure boosting chamber from affecting each other, in order to meet different application scenarios.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0023] Figure 1 This is a schematic diagram of the liquid energy recovery device provided in the exemplary embodiment of this disclosure when it is in the first state; Figure 2 yes Figure 1 A magnified schematic diagram of the local structure at point A; Figure 3 This is a schematic diagram of the liquid energy recovery device provided in the exemplary embodiment of this disclosure when it is in the second state; Figure 4 yes Figure 3 A magnified schematic diagram of the local structure at point B; Figure 5 This is a schematic diagram illustrating the force distribution principle of the first and second diaphragms provided in an exemplary embodiment of this disclosure; Figure 6 This is a schematic diagram showing the connection between the first inlet and the first outlet and the first main pipe and the second main pipe, respectively, provided in an exemplary embodiment of this disclosure; Figure 7 This is a schematic diagram showing the connection between the second inlet and the second outlet and the third and fourth main pipes, respectively, provided in an exemplary embodiment of this disclosure.

[0024] Explanation of reference numerals in the attached figures: 100. Liquid energy recovery device; 1. First housing; 11. First chamber; 111. Pressurization chamber; 112. First buffer space; 12. First inlet; 13. First outlet; 14. First control valve; 15. Second control valve; 2. Second housing; 21. Second chamber; 211. Pressure relief chamber; 212. Second buffer space; 22. Second inlet; 23. Second outlet; 24. Third control valve; 25. Fourth control valve; 3. Dual diaphragm assembly; 31. First diaphragm; 32. Second diaphragm; 33. Connecting rod; 4. Third housing; 41. Third chamber; 42. Support; 5. Position detection assembly; 51. First sensor; 52. Second sensor; 53. Sensing element; 200. First main pipe; 300. Second main pipe; 400. Third main pipe; 500. Fourth main pipe; 600. Accumulator. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0026] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] This application provides a liquid energy recovery device, an energy recovery method, and an energy recovery system, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0028] According to the first aspect of this application, referring to Figure 1 One embodiment of this application provides a liquid energy recovery device 100, including a first housing 1, a second housing 2, and a double diaphragm assembly 3.

[0029] Specifically, refer to Figure 1 The first housing 1 can be made of a metal or other material. The first housing 1 can have a first chamber 11, a first inlet 12, and a first outlet 13. Both the first inlet 12 and the first outlet 13 are connected to the first chamber 11. The first inlet 12 is used to allow low-pressure liquid to flow into the first chamber 11, and the first outlet 13 is used to allow pressurized liquid to flow out of the first chamber 11.

[0030] Reference Figure 1 The second housing 2 can be made of materials such as metal. The second housing 2 can have a second chamber 21, a second inlet 22, and a second outlet 23. Both the second inlet 22 and the second outlet 23 are connected to the second chamber 21. The second inlet 22 is used to allow high-pressure liquid to flow into the second chamber 21, and the second outlet 23 is used to allow depressurized liquid to flow out of the second chamber 21.

[0031] Reference Figure 1 The dual-diaphragm assembly 3 may include a first diaphragm 31, a second diaphragm 32, and a connecting rod 33. The first diaphragm 31 and the second diaphragm 32 may be respectively disposed at both ends of the connecting rod 33, and may be located within the first chamber 11 and the second chamber 21, respectively. The outer edge of the first diaphragm 31 may be fixedly connected to the inner wall of the first chamber 11, the side of the first diaphragm 31 facing the connecting rod 33 may be fixedly connected to the connecting rod 33, and the connecting rod 33 may be connected to the middle position of the first diaphragm 31. The outer edge of the second diaphragm 32 may be fixedly connected to the inner wall of the second chamber 21, the side of the second diaphragm 32 facing the connecting rod 33 may be fixedly connected to the connecting rod 33, and the connecting rod 33 may be connected to the middle position of the second diaphragm 32.

[0032] The connecting rod 33 can be a solid rod made of stainless steel, and its length can be set according to the depth of the first chamber 11 and the second chamber 21. When the first diaphragm 31 and the second diaphragm 32 are subjected to external force, they can undergo elastic deformation. Both the first diaphragm 31 and the second diaphragm 32 can be made of polytetrafluoroethylene (PTFE) composite elastic material or a composite material of stainless steel and carbon fiber reinforcement. This ensures that the first diaphragm 31 and the second diaphragm 32 have good pressure resistance, corrosion resistance, and fatigue resistance, extending their service life and thus extending the service life of the liquid energy recovery device 100. As an example, PTFE composite elastic material has excellent corrosion resistance and elastic recovery ability, making it suitable for corrosive liquid conditions. The stainless steel and carbon fiber reinforcement composite material can improve the pressure resistance and fatigue life of the first diaphragm 31 and the second diaphragm 32, extending their fatigue life by more than three times compared to traditional materials, thereby ensuring the long-term stable operation of the liquid energy recovery device 100.

[0033] Among them, reference Figure 1 and Figure 2 The first diaphragm 31 divides the first chamber 11 into a mutually isolated pressurizing chamber 111 and a first buffer space 112. The first inlet 12 and the first outlet 13 are respectively connected to the pressurizing chamber 111 to ensure that the low-pressure liquid is discharged after completing the pressurization process in the pressurizing chamber 111. The pressurizing chamber 111 is located on the left side of the first diaphragm 31 and is connected to the first inlet 12 and the first outlet 13 through internal flow channels. The first buffer space 112 is located on the right side of the first diaphragm 31.

[0034] Reference Figure 1 and Figure 2 The second diaphragm 32 divides the second chamber 21 into a mutually isolated pressure relief chamber 211 and a second buffer space 212. The second inlet 22 and the second outlet 23 can be connected to the pressure relief chamber 211, allowing the high-pressure liquid to release pressure energy within the pressure relief chamber 211 before being discharged. The connecting rod 33 enables the first diaphragm 31 and the second diaphragm 32 to reciprocate synchronously with the same stroke, thereby ensuring that the pressurization process of the pressurization chamber 111 and the pressure relief process of the pressure relief chamber 211 are coordinated, achieving efficient transmission of pressure energy. The pressure relief chamber 211 is located on the right side of the second diaphragm 32 and is connected to the second inlet 22 and the second outlet 23 through an internal flow channel. The second buffer space 212 is located on the left side of the second diaphragm 32.

[0035] In this application, by employing a double-diaphragm structure, the pressure energy of the high-pressure liquid can be directly transferred to the low-pressure liquid via the second diaphragm 32, connecting rod 33, and first diaphragm 31. This shortens the energy conversion path, reduces energy loss in intermediate stages, and achieves a recovery efficiency of over 90%, which is higher than that of a hydraulic turbine device. The first diaphragm 31 divides the first chamber 11 into an isolated pressurization chamber 111 and a first buffer space 112, while the second diaphragm 32 divides the second chamber 21 into an isolated pressure relief chamber 211 and a second buffer space 212. The first and second diaphragms 31 and 32 isolate the liquids in the pressure relief chamber 211 and the pressurization chamber 111, preventing the mixing of different liquids and enabling the conversion of pressure energy between different liquids. For example, it can be applied to recover residual pressure energy from particulate slurries, corrosive and toxic liquids, thus expanding the applicability of the liquid energy recovery device 100. Meanwhile, the first diaphragm 31 and the second diaphragm 32 constitute a double safety barrier. When one diaphragm is damaged due to fatigue or accident, the other diaphragm can still maintain the isolation function of the system, which can prevent the mixing of liquids from the two sides and thus avoid safety accidents. Furthermore, the first buffer space 112, the second buffer space 212, and the third chamber 41 together form an isolation space, which can isolate the temperature of the liquids in the pressure relief chamber 211 and the pressure boosting chamber 111, thereby preventing the liquids in the pressure relief chamber 211 and the pressure boosting chamber 111 from affecting each other, in order to meet different application scenarios.

[0036] In some embodiments, refer to Figure 1 and Figure 2 The liquid energy recovery device 100 may further include a third housing 4. The third housing 4 may be disposed between the first housing 1 and the second housing 2, and both ends of the third housing 4 may be connected to the first housing 1 and the second housing 2 respectively. The third housing 4 may have a third chamber 41, a portion of the connecting rod 33 may be located in the third chamber 41, and the third chamber 41 may be connected to the first buffer space 112 and the second buffer space 212 respectively. The third chamber 41, together with the first buffer space 112 and the second buffer space 212, forms a buffer chamber. This not only ensures sufficient distance between the liquids in the pressure relief chamber 211 and the pressure boosting chamber 111, thus preventing mutual interference between the liquids in the pressure relief chamber 211 and the pressure boosting chamber 111, but also allows the buffer chamber to contain leaked liquid, providing valuable time for system downtime maintenance and preventing production accidents or equipment damage caused by liquid mixing. This improves the safety level and operational reliability of the liquid energy recovery device 100.

[0037] Reference Figure 1 and Figure 2A support portion 42 may be provided within the third chamber 41. The support portion 42 may be located on the outer periphery of the connecting rod 33 and is used to guide and limit the movement of the connecting rod 33. This improves the accuracy of the movement trajectory of the connecting rod 33, reduces swaying during movement, and thus improves the operational stability of the liquid energy recovery device 100. There may be one or more support portions 42. In this embodiment, there are multiple support portions 42, which are evenly spaced along the axial direction of the connecting rod 33. Multiple support portions 42 can provide more stable support force, further reducing swaying during movement and further improving the operational stability of the liquid energy recovery device 100.

[0038] In some embodiments, refer to Figure 1 The first inlet 12 and the first outlet 13 may be respectively equipped with a first control valve 14 and a second control valve 15. By controlling the opening or closing of the first control valve 14, the low-pressure liquid is controlled to enter the pressurization chamber 111, and by controlling the opening or closing of the second control valve 15, the pressurized liquid is controlled to leave the pressurization chamber 111.

[0039] As an example, refer to Figure 1 Both the first control valve 14 and the second control valve 15 can be one-way valves. The first control valve 14 controls the low-pressure liquid to flow only into the pressurization chamber 111 in one direction, preventing the low-pressure liquid in the pressurization chamber 111 from flowing back out of the pressurization chamber 111 through the first control valve 14. The second control valve 15 controls the pressurized liquid to flow only out of the pressurization chamber 111 in one direction, preventing the pressurized liquid outside the pressurization chamber 111 from flowing back into the pressurization chamber 111 through the second control valve 15. The first control valve 14 may have a first opening pressure, and the second control valve 15 may have a second opening pressure, wherein the first opening pressure is less than the second opening pressure. The first control valve 14 is configured to open when the pressure in the pressurization chamber 111 is lower than the pressure at the first inlet 12, and the second control valve 15 is configured to open when the pressure in the pressurization chamber 111 is higher than the pressure at the first outlet 13. In some embodiments, the first control valve 14 and the second control valve 15 may also be other types of valves, such as solenoid valves.

[0040] As an example, the first opening pressure of the first control valve 14 can be set to 0.2 MPa, and the second opening pressure of the second control valve 15 can be set to 4.0 MPa, which satisfies the requirement that the first opening pressure is less than the second opening pressure. This ensures that the low-pressure liquid can smoothly enter the pressurization chamber 111, and the pressurized liquid is only discharged after reaching the set pressure.

[0041] In some embodiments, refer to Figure 1The second inlet 22 and the second outlet 23 may be respectively equipped with a third control valve 24 and a fourth control valve 25. By controlling the opening or closing of the third control valve 24, the high-pressure liquid is controlled to enter the pressure relief chamber 211, and by controlling the opening or closing of the fourth control valve 25, the depressurized liquid is controlled to leave the pressure relief chamber 211.

[0042] Reference Figure 1 and Figure 2 The liquid energy recovery device 100 may further include a position detection component 5 and a control unit (not shown). The position detection component 5 is used to detect the positions of the first diaphragm 31 and the second diaphragm 32, and the control unit controls the third control valve 24 and the fourth control valve 25 to open or close based on the signal fed back by the position detection component 5. In this embodiment, the position detection component 5 can detect the position of the connecting rod 33, thereby confirming the positions of the first diaphragm 31 and the second diaphragm 32.

[0043] In some embodiments, refer to Figure 1 and Figure 2 The position detection component 5 may include a first sensor 51, a second sensor 52, and a sensing element 53. The positions of the first diaphragm 31 and the second diaphragm 32 can be detected through the sensing element 53 in conjunction with the first sensor 51 or the second sensor 52. The first sensor 51 or the second sensor 52 may be a proximity switch, a Hall sensor, etc., and the sensing element 53 may be a metal sheet, a magnet, etc., that cooperates with it.

[0044] Among them, reference Figure 1 and Figure 2 The first sensor 51 is located near the first housing 1, and the second sensor 52 is located near the second housing 2. When the sensing element 53 is located on the connecting rod 33 and moves synchronously with the connecting rod 33, the positions of the first sensor 51 and the second sensor 52 remain unchanged. For example, the first sensor 51 and the second sensor 52 are both located on the third housing 4.

[0045] Alternatively, the first sensor 51 is positioned close to the second housing 2, and the second sensor 52 is positioned close to the first housing 1. Both the first sensor 51 and the second sensor 52 are mounted on the connecting rod 33. When the first sensor 51 and the second sensor 52 move synchronously with the connecting rod 33, the position of the sensing element 53 remains unchanged. For example, the sensing element 53 is mounted on the third housing 4.

[0046] As an example, refer to Figure 3 and Figure 4 When the connecting rod 33 moves the first diaphragm 31 and the second diaphragm 32 to the left to a first preset position, such as the left stop, the sensing element 53 and the first sensor 51 sense each other. When the sensing element 53 aligns with the first sensor 51, the dual diaphragm assembly 3 reaches the left stop. (Refer to...) Figure 1and Figure 2 When the connecting rod 33 moves the first diaphragm 31 and the second diaphragm 32 to the right to a second preset position, such as the right stop, the sensing element 53 and the second sensor 52 sense each other. When the sensing element 53 and the second sensor 52 are aligned, the dual diaphragm assembly 3 reaches the right stop.

[0047] The third control valve 24 and the fourth control valve 25 can be solenoid valves or electro-hydraulic directional valves, or other valves that can be precisely controlled by electrical signals. The control unit is configured as follows: (refer to...) Figure 3 and Figure 4 When the sensing element 53 and the first sensor 51 sense each other, the third control valve 24 is closed and the fourth control valve 25 is opened; refer to Figure 1 and Figure 2 When the sensor 53 and the second sensor 52 sense each other, the third control valve 24 is opened and the fourth control valve 25 is closed. Through the position detection component 5 and the control unit, precise and timely switching of high-pressure liquid can be achieved.

[0048] In some embodiments, refer to Figure 1 and Figure 5 The force-bearing area of ​​the first diaphragm 31 can be S1, the pressure of the liquid in the pressurization chamber 111 can be P1, the force-bearing area of ​​the second diaphragm 32 can be S2, and the pressure of the liquid in the depressurization chamber 211 can be P2. According to the principle of force balance, the two diaphragms of the double diaphragm assembly 3 are subjected to equal forces during operation, satisfying: P1*S1=P2*S2.

[0049] With the force-bearing area S2 of the second diaphragm 32 and the liquid pressure P2 in the pressure relief chamber 211 remaining constant, increasing the force-bearing area S1 of the first diaphragm 31 decreases the liquid pressure in the pressure boosting chamber 111 and increases the liquid flow rate discharged through the first outlet 13. Conversely, decreasing the force-bearing area S1 of the first diaphragm 31 increases the liquid pressure in the pressure boosting chamber 111 and decreases the liquid flow rate discharged through the first outlet 13. This allows for flexible adaptation to specific process requirements by selecting first diaphragms 31 or second diaphragms 32 of different sizes, achieving pressure and flow rate matching under different operating conditions.

[0050] According to a second aspect of this application, one embodiment of this application provides an energy recovery method employing a liquid energy recovery device 100 as described above, the energy recovery method comprising the following steps.

[0051] Low-pressure liquid entry stage: When the double diaphragm assembly 3 moves to the first preset position, the low-pressure liquid enters the pressurization chamber 111 through the first inlet 12 and pushes the double diaphragm assembly 3 to move towards the second housing 2. The liquid in the pressure relief chamber 211 is discharged through the second outlet 23.

[0052] Specifically, refer to Figure 3 and Figure 4 When the dual diaphragm assembly 3 moves to the first preset position (left stop), the sensor 53 and the first sensor 51 sense each other, and the first sensor 51 sends a left stop signal to the control unit. After receiving the left stop signal, the control unit controls the third control valve 24 to close and the fourth control valve 25 to open according to the signal from the position detection assembly 5. The high-pressure liquid in the pressure relief chamber 211 is discharged through the second outlet 23, and the pressure in the pressure relief chamber 211 drops to near atmospheric pressure. At this time, the pressure in the pressure boosting chamber 111 is lower than the pressure at the first inlet 12, and the first control valve 14 automatically opens. The low-pressure liquid enters the pressure boosting chamber 111 through the first inlet 12. As the low-pressure liquid is continuously injected, it pushes the first diaphragm 31 to move to the right, and then drives the second diaphragm 32 to move to the right synchronously through the connecting rod 33. During this process, the residual liquid in the pressure relief chamber 211 is squeezed by the second diaphragm 32 and continuously discharged through the second outlet 23 until the double diaphragm assembly 3 moves to the right dead point position. The sensing element 53 and the second sensor 52 sense each other, and the second sensor 52 sends a right dead point signal to the control unit.

[0053] Energy conversion stage: When the double diaphragm assembly 3 moves to the second preset position, the high pressure liquid enters the pressure relief chamber 211 through the second inlet 22 and pushes the double diaphragm assembly 3 to move towards the first housing 1, thereby pressurizing the low pressure liquid in the pressurization chamber 111. The pressurized liquid in the pressurization chamber 111 is discharged through the first outlet 13.

[0054] Specifically, refer to Figure 1 and Figure 2 When the dual-diaphragm assembly 3 moves to the second preset position (right dead center), the sensor 53 and the second sensor 52 sense each other, and the second sensor 52 sends a left dead center signal to the control unit. After receiving the right dead center signal, the control unit controls the third control valve 24 to open and the fourth control valve 25 to close. High-pressure liquid enters the pressure relief chamber 211 through the second inlet 22, acting on the right side of the second diaphragm 32. This pushes the second diaphragm 32 to move to the left, which in turn drives the first diaphragm 31 to move to the left synchronously through the connecting rod 33, compressing and pressurizing the low-pressure liquid in the pressurization chamber 111. As the first diaphragm 31 moves to the left, the volume of the pressurization chamber 111 gradually decreases, and the internal liquid pressure continuously increases. When the liquid in the pressurization chamber 111 is pressurized to the second valve opening pressure, that is, when the pressure in the pressurization chamber 111 is higher than the pressure at the first outlet 13, the second control valve 15 automatically opens, and the pressurized liquid is discharged to the user's pipeline through the first outlet 13. The first diaphragm 31 continues to move to the left until the double diaphragm assembly 3 reaches the left stop position. The sensing element 53 and the first sensor 51 sense each other, and the first sensor 51 sends a left stop signal to the control unit.

[0055] Cyclic Phase: After receiving the left dead center signal, the control unit again controls the third control valve 24 to close and the fourth control valve 25 to open, and the device enters the low-pressure liquid entry phase of the next cycle. This process repeats continuously, with the dual diaphragm assembly 3 continuously reciprocating between the left and right dead centers, achieving continuous energy recovery and conversion.

[0056] Throughout the operation, the position detection component 5 provides real-time feedback of the diaphragm position signal, and the control unit precisely controls the switching timing of the third control valve 24 and the fourth control valve 25 to ensure smooth transition between each stage; the first control valve 14 and the second control valve 15 automatically open and close according to pressure changes without the need for additional control, which simplifies the system design and improves operational reliability.

[0057] According to the third aspect of this application, referring to Figure 6 and Figure 7 One embodiment of this application provides an energy recovery system, including a plurality of liquid energy recovery devices 100 as described above, wherein the plurality of liquid energy recovery devices 100 are connected in parallel. This system design with multiple devices connected in parallel can adapt to application scenarios with different flow rates by increasing or decreasing the number of devices or adjusting the control system parameters, making it highly practical.

[0058] As an example, there are five liquid energy recovery devices 100 connected in parallel. This allows the flow and pressure output phases of each liquid energy recovery device 100 to be staggered, resulting in a smoother output waveform with less pulsation after being superimposed within the first main pipe 200. This can cancel out the flow and pressure pulsations of a single liquid energy recovery device 100 during operation, ensuring the overall stability of the energy recovery system output, while also considering equipment cost and floor space.

[0059] In some embodiments, refer to Figure 6 The energy recovery system may also include a first main pipe 200 and a second main pipe 300. The first main pipe 200 is connected to multiple first inlets 12 for centralized delivery of low-pressure liquid. The second main pipe 300 is connected to multiple first outlets 13 for collecting pressurized high-pressure liquid and delivering it to the user's pipeline network.

[0060] Reference Figure 7 The energy recovery system may also include a third main pipe 400 and a fourth main pipe 500. The third main pipe 400 is connected to multiple second inlets 22 for centralized supply of high-pressure liquid to be recovered. The fourth main pipe 500 is connected to multiple second outlets 23 for collecting low-pressure liquid after depressurization and discharging or treating it in a unified manner.

[0061] Reference Figure 6The energy recovery system may also include an accumulator 600, which is connected to the first main pipe 200. An elastic bladder (not shown) may separate the liquid chamber (not shown) and the gas chamber (not shown) inside the accumulator 600. When the pressure in the first main pipe 200 suddenly drops due to instantaneous liquid extraction, the pre-charged high-pressure gas in the accumulator 600 rapidly expands, pushing the liquid into the first main pipe 200 to "fill" the instantaneous flow gap, thereby suppressing the pressure drop in the first main pipe 200. Conversely, when the pressure in the first main pipe 200 shows a tendency to increase instantaneously, fluid is forced into the accumulator 600, and the gas is compressed to absorb the peak pressure. The accumulator 600 acts like a "capacitor" in a circuit or a "shock absorber" in a mechanical system, smoothing pressure and absorbing pulsations.

[0062] When the instantaneous discharge of the energy recovery system exceeds the average flow rate, the pressure inside the first main pipe 200 increases, exceeding the pre-charge pressure of the gas in the gas chamber of the accumulator 600. Under high pressure, a portion of the liquid in the first main pipe 200 enters the liquid chamber of the accumulator 600, compressing the bladder and gas inside the accumulator 600. This excess energy is stored in the accumulator 600 and converted into gas compression energy, thus preventing the pressure and flow rate in the first main pipe 200 from rising to excessively high peak values.

[0063] When the instantaneous discharge of the energy recovery system is less than the average flow rate or zero, the pressure in the first main pipe 200 begins to drop. The compressed gas in the accumulator 600 expands, squeezing out the liquid in the liquid chamber of the accumulator 600 and replenishing it into the first main pipe 200. The accumulator 600 releases energy to maintain the flow rate and pressure in the first main pipe 200, thereby preventing the pressure and flow rate in the first main pipe 200 from dropping to excessively low troughs. Through this high-frequency, rapid "absorption" and "release," the accumulator 600 effectively transforms the inherent intermittent, pulsed output of the energy recovery system into a near-continuous, stable flow.

[0064] In some embodiments, the energy recovery system may further include a control system (not shown) for coordinating the operating sequence of the multiple liquid energy recovery devices 100. This allows the operating phases of each liquid energy recovery device 100 to be staggered sequentially, ensuring continuous operation of the high-pressure liquid inlet, low-pressure liquid pressurization, and discharge processes, avoiding flow interruptions or pressure surges, and further improving the operational stability and energy recovery efficiency of the energy recovery system.

[0065] As an example, there are five liquid energy recovery devices 100. When the first liquid energy recovery device 100 is in the low-pressure liquid entry stage, the second liquid energy recovery device 100 is in the middle of the energy conversion stage, the third liquid energy recovery device 100 is in the early stage of the energy conversion stage, the fourth liquid energy recovery device 100 is in the late stage of the low-pressure liquid entry stage, and the fifth liquid energy recovery device 100 is in the switching and reset stage. The flow output of each liquid energy recovery device 100 is superimposed to each other, effectively offsetting the flow pulsation of a single liquid energy recovery device 100.

[0066] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0068] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0069] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A liquid energy recovery device, characterized in that, include: A first housing, the first housing having a first chamber, a first inlet and a first outlet; The second housing has a second chamber, a second inlet, and a second outlet; A dual-diaphragm assembly, comprising a first diaphragm, a second diaphragm, and a connecting rod, wherein the first diaphragm and the second diaphragm are respectively disposed at both ends of the connecting rod, and the first diaphragm and the second diaphragm are respectively located in the first chamber and the second chamber; The first diaphragm divides the first chamber into a pressurized chamber and a first buffer space that are isolated from each other, and the first inlet and the first outlet are respectively connected to the pressurized chamber; The second diaphragm divides the second chamber into a mutually isolated pressure relief chamber and a second buffer space, and the second inlet and the second outlet are respectively connected to the pressure relief chamber.

2. The liquid energy recovery device according to claim 1, characterized in that, The liquid energy recovery device further includes a third housing, which has a third chamber. A portion of the connecting rod is located in the third chamber. Both ends of the third housing are connected to the first housing and the second housing, respectively. The third chamber is connected to the first buffer space and the second buffer space, respectively.

3. The liquid energy recovery device according to claim 2, characterized in that, A support portion is provided in the third chamber. The support portion is located on the outer periphery of the connecting rod and is used to guide and limit the connecting rod.

4. The liquid energy recovery device according to claim 1, characterized in that, The first inlet and the first outlet are respectively provided with a first control valve and a second control valve. The first control valve has a first opening pressure and the second control valve has a second opening pressure. The first opening pressure is less than the second opening pressure. The first control valve is configured to open when the pressure in the pressurization chamber is lower than the pressure at the first inlet, and the second control valve is configured to open when the pressure in the pressurization chamber is higher than the pressure at the first outlet.

5. The liquid energy recovery device according to claim 1, characterized in that, The second inlet and the second outlet are respectively equipped with a third control valve and a fourth control valve; The liquid energy recovery device further includes a position detection component and a control unit. The position detection component is used to detect the positions of the first diaphragm and the second diaphragm. The control unit controls the third control valve and the fourth control valve to open or close based on the signal fed back by the position detection component.

6. The liquid energy recovery device according to claim 5, characterized in that, The position detection component includes a first sensor, a second sensor, and a sensing element; Wherein, the first sensor is disposed near the first housing, and the second sensor is disposed near the second housing; when the sensing element is disposed on the connecting rod and moves synchronously with the connecting rod, the positions of the first sensor and the second sensor remain unchanged; or... The first sensor is positioned close to the second housing, and the second sensor is positioned close to the first housing. Both the first and second sensors are located on the connecting rod. When the first and second sensors move synchronously with the connecting rod, the position of the sensing element remains unchanged.

7. The liquid energy recovery device according to claim 6, characterized in that, The control unit is configured to: When the sensing element senses the first sensor, the third control valve is closed and the fourth control valve is opened. When the sensor and the second sensor sense each other, the third control valve is opened and the fourth control valve is closed.

8. The liquid energy recovery device according to claim 1, characterized in that, The force-bearing area of ​​the first diaphragm is S1, the pressure of the liquid in the pressurization chamber is P1, the force-bearing area of ​​the second diaphragm is S2, and the pressure of the liquid in the depressurization chamber is P2, satisfying: P1*S1=P2*S2.

9. The liquid energy recovery device according to claim 8, characterized in that, With the force-bearing area S2 of the second diaphragm and the pressure P2 of the liquid in the pressure relief chamber remaining constant, when the force-bearing area S1 of the first diaphragm is increased, the pressure of the liquid in the pressure-boosting chamber decreases and the flow rate of the liquid discharged through the first outlet increases. When the force-bearing area S1 of the first diaphragm is decreased, the pressure of the liquid in the pressure-boosting chamber increases and the flow rate of the liquid discharged through the first outlet decreases.

10. The liquid energy recovery device according to claim 1, characterized in that, Both the first diaphragm and the second diaphragm are made of polytetrafluoroethylene composite elastic material or stainless steel and carbon fiber reinforced layer composite material.

11. An energy recovery method, characterized in that, The energy recovery method using the liquid energy recovery device as described in any one of claims 1 to 10 includes: When the dual diaphragm assembly moves to the first preset position, low-pressure liquid enters the pressurization chamber through the first inlet and pushes the dual diaphragm assembly to move toward the second housing, and the liquid in the pressure relief chamber is discharged through the second outlet; When the dual diaphragm assembly moves to the second preset position, high-pressure liquid enters the pressure relief chamber through the second inlet and pushes the dual diaphragm assembly to move towards the first housing, thereby pressurizing the low-pressure liquid in the pressurization chamber. The pressurized liquid in the pressurization chamber is then discharged through the first outlet.

12. An energy recovery system, characterized in that, It includes a plurality of liquid energy recovery devices as described in any one of claims 1 to 10, wherein the plurality of liquid energy recovery devices are connected in parallel.

13. The energy recovery system according to claim 12, characterized in that, The energy recovery system further includes a first main pipe and a second main pipe, the first main pipe being connected to a plurality of first inlets, and the second main pipe being connected to a plurality of first outlets; and / or, The energy recovery system also includes a third main pipe and a fourth main pipe, the third main pipe being connected to a plurality of second inlets and the fourth main pipe being connected to a plurality of second outlets.

14. The energy recovery system according to claim 13, characterized in that, The energy recovery system further includes an energy storage device connected to the first main pipe; and / or, The energy recovery system also includes a control system for coordinating the operating timing of the multiple liquid energy recovery devices.

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