Valve control energy recovery device with self-boosting function

Abstract

The utility model discloses a valve control energy recovery device with a self-boosting function, and belongs to the technical field of seawater desalination. A valve control energy recovery device with a self-boosting function comprises a reverse osmosis membrane unit and further comprises a first oil cylinder, a second oil cylinder, a third oil cylinder and a fourth oil cylinder, the second oil cylinder is used for conveying seawater, the piston ring is slidably arranged in the first oil cylinder, a piston block is slidably arranged in the second oil cylinder, the two ends of the piston block extend out of the second oil cylinder to be fixedly connected with the two ends of the first oil cylinder respectively, and a rectifying assembly is arranged in the piston block; according to the utility model, bidirectional energy recovery can be realized, the operation efficiency is greatly improved, the self-boosting function is realized, the pressure of a seawater outlet can meet the inlet pressure requirement of a reverse osmosis membrane without using an additional pressure lifting pump, the flow distribution structure is simplified by utilizing the rectification assembly, the pipeline complexity is reduced, and the cost is reduced. And the first oil cylinder and the second oil cylinder are coaxially arranged, so that the risk that concentrated water leaks to seawater is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of seawater desalination, in particular to a valve-controlled energy recovery device with a self-boosting function. Background Art

[0002] Reverse osmosis system energy recovery technology utilizes the high-pressure brine generated by the reverse osmosis membrane to boost the pressure of seawater, thereby reducing the energy consumption of reverse osmosis desalination. Positive displacement energy recovery devices are widely used due to their reduced energy conversion steps and high energy recovery efficiency. They can be categorized into two types: rotor-type and valve-controlled. Rotor-type energy recovery devices have a recovery pressure lower than the required operating pressure and require a pressure booster pump. These devices are manufactured with high precision and are expensive, resulting in significant operational costs and making them unsuitable for small-scale desalination systems. Existing valve-controlled energy recovery devices typically employ a dual-cylinder structure that operates alternately, resulting in low efficiency. They also often require complex valve systems for flow distribution, resulting in complex piping and a large installation footprint. Furthermore, the piston of the hydraulic cylinder is separated by brine and seawater, respectively, creating the risk of brine leakage into the seawater. The outlet pressure of valve-controlled energy recovery devices is often lower than the brine pressure, failing to meet the required inlet pressure of the reverse osmosis membrane, necessitating the use of an additional pressure booster pump for boosting. In light of these shortcomings and deficiencies, a valve-controlled energy recovery device with self-boosting functionality has been proposed. Utility Model Content

[0003] The purpose of the utility model is to solve the problems of low working efficiency, complex flow distribution structure, risk of concentrated water leakage into seawater, and outlet pressure unable to meet usage requirements in the prior art, and to propose a valve-controlled energy recovery device with self-boosting function.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A valve-controlled energy recovery device with a self-boosting function includes a reverse osmosis membrane unit, a high-pressure pump is fixedly provided at the input end of the reverse osmosis membrane unit, and further includes: a first oil cylinder for pressurizing seawater, the two ends of the first oil cylinder are connected to the reverse osmosis membrane unit through a reversing valve; a second oil cylinder for conveying seawater, a piston ring is fixedly provided on the outer wall of the second oil cylinder, the piston ring is slidably provided in the first oil cylinder, a piston block is slidably provided in the second oil cylinder, and the two ends of the piston block extend out of the second oil cylinder and are respectively fixedly connected to the two ends of the first oil cylinder, the two ends of the second oil cylinder are respectively connected to the seawater inlet and the input end of the reverse osmosis membrane unit, a rectifier assembly is provided in the piston block, and the effective area of the piston ring is larger than the effective area of the piston block.

[0006] In order to facilitate the first oil cylinder to pressurize seawater, preferably, the first oil cylinder includes a first cylinder body, and a first end cover and a second end cover are fixedly provided at both ends of the first cylinder body, the first end cover is fixedly provided with a first end plate through a first connecting rod, and the second end cover is fixedly provided with a second end plate through a second connecting rod, and a first piston rod and a second piston rod are fixedly provided at both ends of the piston block, and the ends of the first piston rod and the second piston rod away from the piston block are fixedly connected to the first end plate and the second end plate respectively.

[0007] In order to utilize the residual energy of the concentrated water, further, a first oil port and a second oil port are respectively opened at both ends of the side wall of the first cylinder body, and the first oil port and the second oil port are respectively connected to the A port and the B port of the reversing valve, and a first limit sensor and a second limit sensor for monitoring the position of the piston ring are fixedly arranged at both ends of the side wall of the first cylinder body.

[0008] In order to ensure that seawater can flow reliably into the reverse osmosis membrane unit, a seawater inlet and a seawater outlet are respectively provided on the first end plate and the second end plate, and the seawater outlet is connected to the input end of the reverse osmosis membrane unit through a branch one-way valve. The first piston rod and the second piston rod are provided with a hollow cavity that is interconnected, and the two ends of the hollow cavity are respectively connected to the seawater inlet and the seawater outlet, and the two ends of the rectifier assembly are respectively connected to the hollow cavity.

[0009] Furthermore, the rectification assembly includes an oil port on the left side of the piston and an oil port on the right side of the piston, which are respectively opened at both ends of the piston block. A hydraulic rectification circuit consisting of a first rectification one-way valve, a second rectification one-way valve, a third rectification one-way valve and a fourth rectification one-way valve is arranged in the piston block. The hydraulic rectification circuit is respectively connected to the oil port on the left side of the piston, the oil port on the right side of the piston, the seawater inlet and the seawater outlet.

[0010] Preferably, the second oil cylinder includes a second cylinder body, both ends of the second cylinder body extend out of the first cylinder body, and a third end cover and a fourth end cover are fixedly provided at both ends of the second cylinder body respectively.

[0011] Compared with the prior art, the present invention provides a valve-controlled energy recovery device with a self-boosting function, which has the following beneficial effects:

[0012] 1. This valve-controlled energy recovery device with self-boosting function, through the use of a rectifier component, can achieve bidirectional energy recovery, greatly improving operating efficiency. Simultaneously, with the self-boosting function, the seawater outlet pressure can be brought to the required reverse osmosis membrane inlet pressure without the need for an additional pressure booster pump, reducing the system's equipment cost. The rectifier component simplifies the flow distribution structure and reduces piping complexity. Furthermore, the coaxial arrangement of the first and second oil cylinders eliminates the risk of concentrated water leaking into the seawater.

[0013] 2. The valve-controlled energy recovery device with self-boosting function realizes the self-boosting function of the energy recovery device by designing the effective area of the piston ring to be larger than the effective area of the piston block.

[0014] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model can realize two-way energy recovery, greatly improving the operating efficiency. At the same time, it has a self-pressurization function. The pressure of the seawater outlet can reach the inlet pressure requirement of the reverse osmosis membrane without the use of an additional pressure boosting pump, thereby reducing the equipment cost of the system. The flow distribution structure is simplified by using the rectifier component, the complexity of the pipeline is reduced, and the coaxial arrangement of the first oil cylinder and the second oil cylinder is used to eliminate the risk of concentrated water leaking into the seawater. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of the first oil cylinder of a valve-controlled energy recovery device with a self-boosting function proposed in the utility model;

[0016] Figure 2 This is a schematic diagram of a valve-controlled energy recovery device with a self-boosting function proposed by the present invention;

[0017] Figure 3 This is a structural schematic diagram of a piston block of a valve-controlled energy recovery device with a self-boosting function proposed in the utility model.

[0018] Figure: 1, high-pressure pump; 2, reverse osmosis membrane unit; 3, reversing valve; 4, branch check valve; 5, first oil port; 6, second oil port; 7, seawater inlet; 81, first end plate; 82, second end plate; 91, first connecting rod; 92, second connecting rod; 10, second oil cylinder; 101, third end cover; 102, second cylinder body; 103, fourth end cover; 11, first oil cylinder; 111, first end cover; 112, first cylinder Body; 113, second end cover; 12, first limit sensor; 13, second limit sensor; 14, rectifier assembly; 141, first piston rod; 142, piston left oil port; 143, piston block; 144, first rectifier one-way valve; 145, second rectifier one-way valve; 146, third rectifier one-way valve; 147, fourth rectifier one-way valve; 148, piston right oil port; 149, second piston rod; 15, seawater outlet. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0021] Example:

[0022] Reference Figure 1-Figure 3 A valve-controlled energy recovery device with a self-boosting function includes a reverse osmosis membrane unit 2, a high-pressure pump 1 is fixedly provided at the input end of the reverse osmosis membrane unit 2, and the input end of the high-pressure pump 1 is connected to the seawater inlet. It also includes: a first oil cylinder 11 for pressurizing seawater, the two ends of the first oil cylinder 11 are connected to the reverse osmosis membrane unit 2 through a reversing valve 3, the reversing valve 3 is preferably an electromagnetic reversing valve 3, that is, the concentrated water discharge end of the reverse osmosis membrane unit 2 is connected to the P port of the reversing valve 3, the first cylinder body 112 side wall is respectively provided with a first oil port 5 and a second oil port 6, the first oil port 5 and the second oil port 6 are respectively connected to the A port and the B port of the reversing valve 3, and the T port of the reversing valve 3 is connected to the box for collecting concentrated water; a second oil cylinder 10 for conveying seawater, a piston ring is fixedly provided on the outer wall of the second oil cylinder 10, the piston ring is located in the middle position of the second oil cylinder 10, and the piston ring is slidably arranged in the first oil cylinder 11, that is, the piston ring The circumference of the piston is against the inner wall of the first cylinder 11, and a piston block 143 is slidingly arranged in the second cylinder 10, and the two ends of the piston block 143 extend from the second cylinder 10 and are then fixedly connected to the two ends of the first cylinder 11, that is, the second cylinder body 102 of the second cylinder 10 slides back and forth in the first cylinder 11, and the two ends of the second cylinder 10 are respectively connected to the seawater inlet and the input end of the reverse osmosis membrane unit 2, so that two-way energy recovery can be achieved and the concentrated water is isolated from the seawater, eliminating the risk of concentrated water leaking into the seawater. A rectifier assembly 14 is provided in the piston block 143, and the effective area of the piston ring is larger than the effective area of the piston block 143. The self-boosting function of the energy recovery device can be achieved through this area difference.

[0023] Reference Figure 1 and Figure 2The first oil cylinder 11 includes a first cylinder body 112, and the first end cover 111 and the second end cover 113 are fixedly provided at both ends of the first cylinder body 112, the first end cover 111 is fixedly provided with the first end plate 81 through the first connecting rod 91, and the second end cover 113 is fixedly provided with the second end plate 82 through the second connecting rod 92, and the first piston rod 141 and the second piston rod 149 are fixedly provided at both ends of the piston block 143, and the ends of the first piston rod 141 and the second piston rod 149 away from the piston block 143 are fixedly connected to the first end plate 81 and the second end plate 82 respectively, and the two ends of the second cylinder body 102 pass through the first end cover 111 and the second end cover 113 respectively, and the length of the second cylinder body 102 is greater than the length of the first cylinder body 112.

[0024] Reference Figure 1 and Figure 2 A first oil port 5 and a second oil port 6 are respectively provided at both ends of the side wall of the first cylinder body 112. The first oil port 5 and the second oil port 6 are respectively connected to the A port and the B port of the reversing valve 3, and a first limit sensor 12 and a second limit sensor 13 for monitoring the position of the piston ring are fixedly provided at both ends of the side wall of the first cylinder body 112.

[0025] Reference Figure 1 and Figure 2 The first end plate 81 and the second end plate 82 are respectively provided with a seawater inlet 7 and a seawater outlet 15. The seawater outlet 15 is connected to the input end of the reverse osmosis membrane unit 2 through the branch one-way valve 4. The first piston rod 141 and the second piston rod 149 are provided with mutually connected hollow cavities, and the two ends of the hollow cavity are respectively connected to the seawater inlet 7 and the seawater outlet 15, and the two ends of the rectifier assembly 14 are respectively connected to the hollow cavity.

[0026] Reference Figure 2 and Figure 3The rectifier assembly 14 includes a piston left oil port 142 and a piston right oil port 148, which are respectively opened at both ends of the piston block 143. A hydraulic rectifier circuit composed of a first rectifier check valve 144, a second rectifier check valve 145, a third rectifier check valve 146 and a fourth rectifier check valve 147 is provided in the piston block 143. The principle of the hydraulic rectifier circuit is similar to that of a rectifier circuit. The hydraulic rectifier circuit is connected to the piston left oil port 142, the piston right oil port 148, the seawater inlet 7 and the seawater outlet 15 respectively to ensure that no matter the piston Regardless of how the plug 143 moves, seawater always flows in from the seawater inlet 7 and out from the seawater outlet 15. This simplifies the flow distribution structure and reduces the complexity of the pipeline. The seawater outlet 15 is connected between the outlet of the high-pressure pump 1 and the inlet of the reverse osmosis membrane unit 2. The seawater, after being pressurized by the energy recovery device, can enter the reverse osmosis membrane unit 2 for operation. At the same time, to prevent pressure fluctuations, the water outlet of the high-pressure pump 1 flows back into the energy recovery device, that is, into the second cylinder 102. A branch check valve 4 is installed in the pipeline behind the seawater outlet 15.

[0027] Reference Figure 1 and Figure 2 The second oil cylinder 10 includes a second cylinder body 102, and a first cylinder body 112 extends from both ends of the second cylinder body 102. A third end cover 101 and a fourth end cover 103 are fixedly provided at both ends of the second cylinder body 102, respectively. The first piston rod 141 passes through the third end cover 101 and is fixedly connected to the first end plate 81, and the second piston rod 149 passes through the fourth end cover 103 and is fixedly connected to the second end plate 82.

[0028] In the present invention, when in use, the high-pressure concentrated water generated by the reverse osmosis membrane unit 2 passes through the P oil port, the A oil port and the first oil port 5 of the reversing valve 3 in sequence and then enters the left chamber of the first oil cylinder 11, thereby pushing the second oil cylinder 10 to move to the right. Since the rectifier assembly 14 is connected and fixed by the first end plate 81 and the second end plate 82 and cannot move, the left chamber of the second oil cylinder 10 is compressed. The seawater in the left chamber is pressurized and flows out through the left oil port 142 of the piston, the fourth rectifier check valve 147, the hollow cavity of the second piston rod 149 and the seawater outlet 15 in sequence for energy recovery. The device then passes through the branch one-way valve 4 and enters the reverse osmosis membrane unit 2 to work. Because the effective area of the piston ring is larger than the effective area of the piston block 143, the seawater pressure at the seawater outlet 15 is higher than the concentrated water pressure at the first oil port 5, that is, the energy recovery device realizes the self-pressurization function; at the same time, the unpressurized seawater passes through the seawater inlet 7, the hollow cavity of the first piston rod 141, the second rectifying one-way valve 145 and the oil port 148 on the right side of the piston in sequence and flows into the right chamber of the second oil cylinder 10, while the concentrated water in the right chamber of the first oil cylinder 11 passes through the second oil port 6, the oil port B of the reversing valve 3 in sequence. and T oil port; when the second oil cylinder 10 continues to move right to the second limit sensor 13, the reversing valve 3 automatically switches to the right position. At this time, the high-pressure concentrated water generated by the reverse osmosis membrane unit 2 passes through the P oil port, B oil port and second oil port 6 of the electromagnetic reversing valve 3 in sequence and enters the right cavity of the first oil cylinder 11, thereby pushing the second oil cylinder 10 to start moving left. The right cavity of the second oil cylinder 10 is compressed, and the seawater in the right cavity is pressurized and flows out through the right oil port 148 of the piston, the third rectifying one-way valve 146, the hollow cavity of the second piston rod 149 and the seawater outlet 15 in sequence. Energy recovery device, at the same time, the unpressurized seawater flows into the left chamber of the second oil cylinder 10 through the seawater inlet 7, the hollow cavity of the first piston rod 141, the first rectifying one-way valve 144 and the oil port 142 on the left side of the piston in sequence, and the concentrated water in the left chamber of the first oil cylinder 11 is discharged through the first oil port 5, the A oil port and the T oil port of the reversing valve 3 in sequence; when the second oil cylinder 10 continues to move left to the first limit sensor 12, the electromagnetic reversing valve 3 automatically switches to the left position, and the second oil cylinder 10 starts to move right again, and this cycle is repeated to realize the two-way and efficient recovery function of the energy recovery device.

[0029] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve-controlled energy recovery device with a self-boosting function, comprising a reverse osmosis membrane unit (2), wherein a high-pressure pump (1) is fixedly provided at the input end of the reverse osmosis membrane unit (2), characterized in that: Also includes: a first oil cylinder (11) for pressurizing seawater, wherein both ends of the first oil cylinder (11) are connected to the reverse osmosis membrane unit (2) via a reversing valve (3); A second oil cylinder (10) for conveying seawater, wherein a piston ring is fixedly provided on the outer wall of the second oil cylinder (10), the piston ring is slidably provided in the first oil cylinder (11), a piston block (143) is slidably provided in the second oil cylinder (10), and two ends of the piston block (143) extend out of the second oil cylinder (10) and are respectively fixedly connected to two ends of the first oil cylinder (11), the two ends of the second oil cylinder (10) are respectively connected to the seawater inlet and the input end of the reverse osmosis membrane unit (2), a rectifying assembly (14) is provided in the piston block (143), and the effective area of the piston ring is larger than the effective area of the piston block (143).

2. The valve-controlled energy recovery device with self-boosting function according to claim 1, characterized in that: The first oil cylinder (11) comprises a first cylinder body (112), wherein a first end cover (111) and a second end cover (113) are fixedly provided at both ends of the first cylinder body (112), the first end cover (111) is fixedly provided with a first end plate (81) via a first connecting rod (91), and the second end cover (113) is fixedly provided with a second end plate (82) via a second connecting rod (92), and a first piston rod (141) and a second piston rod (149) are fixedly provided at both ends of the piston block (143), and ends of the first piston rod (141) and the second piston rod (149) away from the piston block (143) are fixedly connected to the first end plate (81) and the second end plate (82), respectively.

3. The valve-controlled energy recovery device with self-boosting function according to claim 2, characterized in that: A first oil port (5) and a second oil port (6) are respectively provided at both ends of the side wall of the first cylinder body (112), and the first oil port (5) and the second oil port (6) are respectively connected to the A port and the B port of the reversing valve (3). A first limit sensor (12) and a second limit sensor (13) for monitoring the position of the piston ring are respectively fixedly provided at both ends of the side wall of the first cylinder body (112).

4. The valve-controlled energy recovery device with self-boosting function according to claim 3, characterized in that: The first end plate (81) and the second end plate (82) are respectively provided with a seawater inlet (7) and a seawater outlet (15), the seawater outlet (15) being connected to the input end of the reverse osmosis membrane unit (2) via a branch one-way valve (4), the first piston rod (141) and the second piston rod (149) are respectively provided with a hollow cavity that is interconnected, the two ends of the hollow cavity being respectively connected to the seawater inlet (7) and the seawater outlet (15), and the two ends of the rectifier assembly (14) being respectively connected to the hollow cavity.

5. The valve-controlled energy recovery device with self-boosting function according to claim 4, characterized in that: The rectifier assembly (14) includes a piston left oil port (142) and a piston right oil port (148), which are respectively opened at both ends of the piston block (143). A hydraulic rectifier circuit composed of a first rectifier check valve (144), a second rectifier check valve (145), a third rectifier check valve (146) and a fourth rectifier check valve (147) is arranged in the piston block (143). The hydraulic rectifier circuit is respectively connected to the piston left oil port (142), the piston right oil port (148), the seawater inlet (7) and the seawater outlet (15).

6. The valve-controlled energy recovery device with self-boosting function according to claim 1, characterized in that: The second oil cylinder (10) comprises a second cylinder body (102), both ends of the second cylinder body (102) extend out of the first cylinder body (112), and a third end cover (101) and a fourth end cover (103) are fixedly provided at both ends of the second cylinder body (102).

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