Work exchange type energy recovery device with leakage rate detection function

Abstract

The invention provides a work exchange type energy recovery device with a leakage rate detection function, which is provided with a special circulation hole, the circulation hole is not communicated with a relative low-pressure fluid inlet and a relative low-pressure fluid outlet of the energy recovery device, and an upper end cover and a lower end cover of the energy recovery device are not provided with leakage liquid guide-out channels. The shell, the upper end cover and the lower end cover form a leaked fluid collecting area, the circulating hole is externally connected with a leaked fluid discharging pipe, and a flow meter is arranged on the leaked fluid discharging pipe; the rotating assembly and the non-rotating assembly of the energy recovery device are provided with guide channels, and leaked liquid between the rotating assembly and the non-rotating assembly is guided into the leaked fluid collecting area or guided to the circulating hole. According to the invention, the fault detection problem that the most important fault high-pressure fluid leakage of the energy recovery device is too large can be solved through a low-cost scheme, and the abnormal condition can be accurately detected in real time.

Description

Technical Field

[0001] This invention relates to a pressure energy recovery device with leakage detection function in a liquid system. Background Technology

[0002] Liquid residual pressure energy recovery devices come in various forms, with significant differences in structural complexity and efficiency. Based on their working principles, they can be divided into two main categories: hydraulic turbine energy recovery devices and power exchange energy recovery devices.

[0003] The energy recovery device using a hydraulic turbine involves a process of pressure energy → mechanical energy (shaft work) → pressure energy. Due to the multiple energy conversions involved, although the technology is relatively mature, its energy recovery efficiency is only 30-70%.

[0004] Energy recovery devices using power exchange technology convert energy between pressure and pressure energy. This allows high- and low-pressure fluids to directly exchange pressure energy. If friction and leakage in the equipment are ignored, the device's efficiency can theoretically reach 100%, and in practice, it can exceed 90%. This high recovery efficiency has made it a mainstream product both domestically and internationally. Representative products include the rotor-type pressure exchanger, such as the Pressure Exchanger (PX) from ERI Corporation (USA), a power-interactive energy recovery device disclosed in ZL2010 1 0197604.1, and a pressure exchanger disclosed in ZL 2008 1 0163387.7; these devices are highly efficient, small in size, and easy to use, and are widely used in seawater desalination or membrane concentration systems.

[0005] However, in the event of a malfunction, such as a severe high-pressure fluid leak, it is necessary to indirectly determine whether the energy recovery unit is faulty by analyzing abnormal vibrations, the flow and conductivity of the water entering or leaving the four ports of the energy recovery unit, and their relationship to normal conditions, or by observing abnormal fluctuations in the overall water production flow or conductivity of the seawater desalination unit. But when multiple units are connected in parallel, it is difficult to determine whether a particular unit is faulty, and even if a potential fault is detected, it is difficult to directly identify which unit is malfunctioning. Furthermore, transporting faulty equipment during the search process may cause secondary damage to the membrane, energy recovery unit, circulating booster pump, and valves. Locating the faulty energy recovery unit requires sampling and analyzing the conductivity of the four water lines entering and leaving each energy recovery unit.

[0006] The most straightforward method for detecting leaks in high-pressure fluids is to install a high-pressure flow meter at the high-pressure outlet of the energy recovery device and compare it with the inlet flow rate to determine the leakage amount. However, this requires installing flow meters at both the high-pressure seawater outlet and the high-pressure concentrate inlet. Even though the leakage amount is always much smaller than the outlet flow rate, a large-range flow meter is still needed, which not only raises cost issues but also affects the accuracy of the measurement.

[0007] Furthermore, current energy recovery device solutions, when dealing with leaking fluids, primarily involve guiding the fluids inside the energy recovery device to a low-pressure concentrate outlet for discharge, making it impossible to measure them separately. Summary of the Invention

[0008] The purpose of this invention is to provide a power exchange energy recovery device with leakage detection function, which can solve the problem of excessive high-pressure fluid leakage, the most serious fault in energy recovery devices, through a low-cost solution, and can accurately detect abnormal situations in real time. To this end, this invention adopts the following technical solution:

[0009] A power exchange energy recovery device with leakage detection function includes a shaft, an upper end cover, a lower end cover, and a cylindrical outer shell. The upper end cover, the lower end cover, and the outer shell are connected to form a container. One pressure exchange tube or multiple pressure exchange tubes are arranged uniformly along the circumference of the container inside the container. The upper end cover has a relatively high-pressure fluid inlet and a relatively low-pressure fluid outlet; the lower end cover has a relatively high-pressure fluid outlet and a relatively low-pressure fluid inlet. The power exchange energy recovery device drives the pressure exchange tubes to rotate in a circular motion via the shaft. The device is characterized by having a dedicated flow hole that is not connected to the relatively low-pressure fluid inlet and outlet. The upper and lower end covers do not have leakage discharge channels. The container constitutes a leakage fluid collection area. A leakage fluid discharge pipe is connected to the outside of the flow hole, and a flow meter is installed on the leakage fluid discharge pipe. The rotating and non-rotating components in the upper and lower parts of the outer shell of the power exchange energy recovery device have guide channels to guide the leakage fluid between the rotating and non-rotating components into the leakage fluid collection area or into the flow hole.

[0010] Based on the above technical solutions, the present invention may also employ the following further technical solutions or a combination of these further technical solutions:

[0011] The flow hole is provided on the outer casing, and the guide channel guides the leaked fluid between the rotating and non-rotating components to the leaked fluid collection area. A leaked fluid discharge pipe is provided on the flow hole. This design allows the power exchange energy recovery device to enter a detectable state more quickly after operation, and the detection structure is simpler and the results are more accurate.

[0012] The rotating assembly includes an upper thrust plate and a lower thrust plate, and the non-rotating assembly includes an upper distribution plate and a lower distribution plate. Each thrust plate and distribution plate is fitted onto the shaft with a central hole. The upper distribution plate is connected to the upper end cover via an upper clamping member fitted onto the shaft, and the lower distribution plate is connected to the lower end cover via a lower clamping member fitted onto the shaft. A circumferential positioning structure prevents the upper distribution plate from rotating relative to the upper end cover, and the lower distribution plate from rotating relative to the lower end cover. The upper thrust plate is pressed against the lower surface of the upper distribution plate, and the lower thrust plate is pressed against the upper surface of the lower distribution plate. The upper end cover and the upper distribution plate are pressed together to form a first upper... The pressure relief chamber is formed by pressing the upper distribution plate and the upper thrust plate together to form a second upper pressure relief chamber. The upper clamping member is provided with a first upper guide discharge through hole, and the upper thrust plate is provided with a second upper guide discharge through hole at a position off-center from the center hole, connecting the first upper pressure relief chamber, the second upper pressure relief chamber and the inner cavity inside the outer shell to each other. The lower end cover is pressed together with the lower distribution plate to form a first lower pressure relief chamber, and the lower distribution plate is pressed together with the lower thrust plate to form a second lower pressure relief chamber. The lower clamping member is provided with a first lower guide discharge through hole, and the lower thrust plate is provided with a second lower guide discharge through hole at a position off-center from the center hole, connecting the first lower pressure relief chamber, the second lower pressure relief chamber and the inner cavity inside the outer shell to each other.

[0013] The container is a container without an exhaust structure.

[0014] The flow meter is a flow meter with a high flow limit alarm switch.

[0015] The lower surface of the upper end cover is provided with a concave area centered on the axis, and the upper surface of the upper distribution plate is provided with a concave area centered on the axis to form the first upper pressure relief cavity. The upper surface of the lower end cover is provided with a concave area centered on the axis, and the lower surface of the lower distribution plate is provided with a concave area centered on the axis to form the first lower pressure relief cavity. The first upper guide discharge through hole of the upper clamping member is provided with a transverse section and an axial section. The mounting hole of the upper distribution plate that mates with the upper clamping member is provided with a guide ring corresponding to the transverse section around the upper clamping member. The first lower guide discharge through hole of the lower clamping member is provided with a transverse section and an axial section. The mounting hole of the lower distribution plate that mates with the lower clamping member is provided with a guide ring corresponding to the transverse section around the lower clamping member. The upper surface of the upper distribution plate is provided with a concave area centered on the axis. The lower surface of the upper clamping member is concealed in the mounting hole of the upper distribution plate to form the second upper pressure relief cavity. The lower surface of the lower distribution plate is provided with a concave area centered on the axis. The upper surface of the lower clamping member is concealed in the mounting hole of the lower distribution plate to form the second lower pressure relief cavity.

[0016] By employing the technical solution of this invention, the problem of high-pressure fluid leakage alarm in energy recovery devices can be solved at a low cost. Furthermore, this invention proposes a concept and scheme for collecting fluid leaking from relatively high-pressure areas within the casing. Unlike previous methods that guided leaked fluid to the relatively low-pressure fluid outlet of the energy recovery device, this invention guides and collects the leaked fluid from the relatively high-pressure area inside the energy recovery device's casing. The fluid is then led out and measured through an opening in the casing. A flow meter with an upper limit alarm switch is used for measurement and alarm, enabling real-time and accurate detection of abnormalities. Moreover, the guidance of leaked fluid is smoother, improving the operational safety of the energy recovery device. Attached Figure Description

[0017] Figure 1 The cross-sectional view provided in this invention illustrates the structural principle of the invention.

[0018] Figure 2a for Figure 1 A bottom view of the upper distribution plate 3 in the diagram.

[0019] Figure 2b for Figure 1 A cross-sectional schematic diagram of the upper distribution plate 3 in the diagram.

[0020] Figure 3a for Figure 1 A top view of the upper thrust plate 4.

[0021] Figure 3b for Figure 1 A cross-sectional view of the upper thrust plate 4 in the diagram.

[0022] Figure 3c for Figure 1 A bottom view of the upper thrust plate 4 in the diagram.

[0023] Figure 4a1 for Figure 1 A top view of the upper drive disk 5.

[0024] Figure 4b1 for Figure 1 A cross-sectional schematic diagram of the upper drive disk 5.

[0025] Figure 4a2 for Figure 1 A top view of the lower drive disk 5'.

[0026] Figure 4b2 for Figure 1 A cross-sectional schematic diagram of the lower drive disk 5' in the diagram.

[0027] Figure 5a for Figure 1 A cross-sectional view of the lower end cap 1' in the middle.

[0028] Figure 5b for Figure 1 A top view of the lower end cap 1' in the middle.

[0029] Figure 6a for Figure 1 A cross-sectional view of the upper cover 1 in the middle.

[0030] Figure 6b for Figure 1 A bottom view of the upper cover 1.

[0031] Figure 7a for Figure 1 A cross-sectional schematic diagram of the lower clamping member 9'.

[0032] Figure 7b for Figure 1 A bottom view of the lower clamping member 9'.

[0033] Figure 8a This is a cross-sectional view of an embodiment of the present invention, showing the appearance of the present invention after the drive motor is installed.

[0034] Figure 8b The right view of the embodiment provided by the present invention shows the right view of the embodiment of the installation drive motor of the present invention.

[0035] Figure 9 This is a three-dimensional perspective view of an embodiment of the parallel installation and use of multiple energy recovery devices provided by the present invention, showing a structural arrangement for parallel installation of the present invention. L1 is a low-pressure water inlet branch pipe of the energy recovery device, L2 is a low-pressure water outlet branch pipe of the energy recovery device, G1 is a high-pressure water outlet branch pipe of the energy recovery device, and G2 is a high-pressure water inlet branch pipe of the energy recovery device. They are respectively connected to the low-pressure water inlet main pipe, the low-pressure water outlet main pipe, the high-pressure water outlet main pipe, and the high-pressure water inlet main pipe.

[0036] Figure 10 for Figure 9 Enlarged view of part I. Detailed Implementation

[0037] Referring to the accompanying drawings, the power exchange energy recovery device includes a rotating assembly comprising: a shaft 2, a rotating ring 21 for mechanical sealing fitted outside the shaft 2, an inner ring and balls of an upper bearing 10, an upper thrust plate 4, an upper drive plate 5 fixed to the shaft 2, one or more ejector pins 6 and springs 7, an ejector pin guide frame 18, a pressure exchange pipe 8 parallel to the shaft axis, a lower drive plate 5' fixed to the shaft 2, a lower thrust plate 4', and an inner ring and balls of the lower bearing 10'. The upper drive plate 5 and the lower drive plate 5' have corresponding one or more openings on their circumferences centered on the plate center. Multiple circular holes 80 are provided. One or more corresponding through slots 70 and 70' are also formed on the circumference of the upper thrust plate 4 and lower thrust plate 4' centered on the plate. The pressure exchange pipe 8 passes through the circular hole 80 of the upper drive plate 5 at its upper end, inserts into the through slot 70 of the upper thrust plate 4, and has a sealing ring 16 on the insertion surface. The pipe 8 also passes through the circular hole 80 of the lower drive plate 5' at its lower end, inserts into the through slot 70' of the lower thrust plate 4', and has a sealing ring 16 on the insertion surface. The upper drive plate 5 is fixed to the upper end of the shaft 2. The ejector pin guide 18 is mounted on the upper drive plate 5, and the lower drive plate 5' is fixed to the lower end of the shaft 2. The shaft 2 is driven by a motor, which in turn drives the rotating assembly to rotate.

[0038] The power exchange energy recovery device also includes a non-rotating component, which includes a mechanical seal cover 22, a stationary ring 20 for mechanical sealing that cooperates with the rotating ring 21, an upper cover 1, an outer ring of an upper bearing 10 installed inside the upper cover, an upper clamping member 9, an upper distribution plate 3 installed on the lower end face of the upper cover 1, a lower clamping member 9', a lower cover 1', a lower distribution plate 3' installed on the upper end face of the lower cover 1', an outer ring of the lower bearing 10', and a housing 19. The inner rings of the upper bearing 10 and the lower bearing 10' circumferentially position the rotating component. The upper cover 1, the lower cover 1', and the housing 1 are connected to form a container.

[0039] Each thrust plate 4, 4' and distribution plate 3, 3' is fitted onto the shaft 2 with a center hole. The upper clamping member 9 and the lower clamping member 9' are also fitted onto the shaft 2. Pins 15 and the upper clamping member 9 fix the upper distribution plate 3 to the upper end cover 1; pins 15 and the lower clamping member 9' fix the lower distribution plate 3' to the lower end cover 1'. The upper clamping member 9 is threaded to the upper end cover 1, and the lower clamping member 9' is threaded to the lower end cover 1'. The upper distribution plate 3 is connected to the upper end cover via a clamping cap. Pins 15 act as a circumferential positioning structure, preventing the upper distribution plate from rotating relative to the upper end cover, and the lower distribution plate from rotating relative to the lower end cover.

[0040] The upper end cover 1 is provided with a relatively high pressure fluid inlet 31 and a relatively low pressure fluid outlet 34; the lower end cover 1' is provided with a relatively high pressure fluid outlet 32 ​​and a relatively low pressure fluid inlet 33.

[0041] The upper end cover 1 is fixed to the upper end of the outer shell 19 and is equipped with a sealing ring 14. The lower end cover 1' is fixed to the lower end of the outer shell 19 and is equipped with a sealing ring 14. The rotating assembly is installed inside the outer shell 1. The upper end face of the upper thrust plate 4 of the rotating assembly contacts the lower end face of the upper distribution plate 3 of the non-rotating assembly, and the lower end face of the lower thrust plate 4' of the rotating assembly contacts the upper end face of the lower distribution plate 3' of the non-rotating assembly, and they rotate relative to each other to form two relatively sliding friction pairs. The compression spring 7 pushes the upper thrust plate 4 onto the upper distribution plate 3 through the ejector pin 6. At the same time, its reaction force pushes the lower thrust plate 4' onto the lower distribution plate 3' through the compression spring 7, the upper drive plate 5, and the step at the lower end of the shaft 2. That is, the lower end face of the upper distribution plate 3 and the upper end face of the lower distribution plate 3' position the rotating assembly vertically.

[0042] Shaft 2 passes through mechanical seal cover 22, upper bearing 10, upper distribution plate 3, and upper thrust plate 4 mounted on upper end cover 1 and is firmly connected to upper drive plate 5. Its lower end passes through lower bearing 10', lower distribution plate 3', and lower thrust plate 4' mounted on lower end cover 1' and is firmly connected to lower drive plate 5'. Upper thrust plate 4 and lower thrust plate 4' can float between upper distribution plate and lower distribution plate under the pressure of spring and fluid.

[0043] The through grooves 70 and 70' are circular at one end where they are inserted into the pressure exchange pipe 8, and fan-shaped arc at the other end where they communicate with the upper distribution plate 3 and the lower distribution plate 3'. The area of ​​the fan-shaped arc is smaller than the area of ​​the circular hole on the reverse side. In this way, the fluid pressure acting on the upper thrust plate 4 and the lower thrust plate 4' can push the upper thrust plate 4 and the lower thrust plate 4' onto the upper distribution plate 3 and the lower distribution plate 3' respectively, thus achieving a self-tightening effect on the sealing surface.

[0044] The upper distribution plate 3 has a high-pressure side through groove 50 and a low-pressure side through groove 60, and the lower distribution plate 3' has a high-pressure side through groove 50' and a low-pressure side through groove 60'. The portion separating the two through grooves on the upper distribution plate 3 is the sealing area of ​​the upper distribution plate 3, which separates the relatively high-pressure fluid from the relatively low-pressure fluid. The portion separating the two through grooves on the lower distribution plate 3' is the sealing area of ​​the lower distribution plate 3', which separates the relatively high-pressure fluid from the relatively low-pressure fluid.

[0045] The relative high pressure fluid inlet 31 of the upper end cover 1, the high pressure side through groove 50 of the upper distribution plate 3, the through groove 70 of the upper thrust plate 4 that communicates with the relative high pressure fluid outlet and the relative high pressure fluid inlet, the pressure exchange pipe 8 that communicates with the through groove 50 of the upper distribution plate 3, the through groove 70' of the lower thrust plate 4' that communicates with the relative high pressure fluid outlet and the relative high pressure fluid inlet, the high pressure side through groove 50' of the lower distribution plate 3', and the relative high pressure fluid outlet 32 ​​provided on the lower end cover 1' constitute a relative high pressure zone;

[0046] The relatively low-pressure fluid inlet 33 located on the lower end cover 1', the low-pressure side through groove 60' of the lower distribution plate 3', the through groove 70' of the lower thrust plate 4' that communicates with the relatively low-pressure fluid inlet and the relatively low-pressure fluid outlet, the pressure exchange pipe 8 that communicates with the through groove 70' of the lower distribution plate 3', the through groove 70 of the upper thrust plate 4 that communicates with the relatively low-pressure fluid outlet and the relatively high-pressure fluid inlet, the low-pressure side through groove 60 of the upper distribution plate 3, and the relatively high-pressure fluid outlet 34 located on the upper end cover 1 constitute a relatively low-pressure zone;

[0047] The main failure and malfunction of power exchange pressure-type energy recovery devices is an increase in leakage in the high-pressure area. The power exchange energy recovery device with leakage detection function provided by this invention can solve the leakage detection problem at a low cost.

[0048] In this invention, the upper end cover 1 and the lower end cover 1' do not have leakage outlet channels. The container constitutes a leakage fluid collection area, and a flow hole R is provided on the outer shell. A leakage fluid discharge pipe 170 is provided on the flow hole R, and a flow meter 17 is provided on the leakage fluid discharge pipe. The rotating and non-rotating components in the upper and lower parts of the power exchange energy recovery device's outer shell are provided with guide channels to guide the leakage fluid between the rotating and non-rotating components into the leakage fluid collection area. The flow meter 17 is a flow meter with a high-limit alarm switch.

[0049] The container can be one without an exhaust vent. Practical verification shows that without an exhaust vent, the mechanical seal life and the timeliness and accuracy of leakage are basically unaffected: when the leaked liquid exceeds the set height of the flow hole, it can be continuously and stably discharged under pressure, which can accurately characterize the high-pressure leakage flow rate to determine whether the leakage is normal or abnormal, and the severity of the abnormal leakage.

[0050] The upper thrust plate 4 is pressed against the lower surface of the upper distribution plate 3, and the lower thrust plate 4' is pressed against the upper surface of the lower distribution plate 3'; the upper end cover 1 and the upper distribution plate 3 are pressed together to form the first upper pressure relief chamber C, and the upper distribution plate 3 and the upper thrust plate 4 are pressed together to form the second upper pressure relief chamber D. The upper clamping member 9 is provided with a first upper guide discharge through hole 41, and the upper thrust plate 4 is provided with a second upper guide discharge through hole 42 at a position off-center from the center hole, connecting the first upper pressure relief chamber C, the second upper pressure relief chamber D, and... The inner cavities K (leakage fluid collection areas) inside the outer shell are interconnected; the lower end cover 1' and the lower distribution plate 3' are pressed together to form the first lower pressure relief cavity C', the lower distribution plate 3' and the lower thrust plate 4' are pressed together to form the second lower pressure relief cavity D', the lower clamping member is provided with a first lower guide discharge through hole 41', and the lower thrust plate 4' is provided with a second lower guide discharge through hole 42' at a position off-center from the center hole, connecting the first lower pressure relief cavity C', the second lower pressure relief cavity D' and the inner cavities K inside the outer shell. By configuring the first upper pressure relief chamber C, the second upper pressure relief chamber D, the first lower pressure relief chamber C', and the second lower pressure relief chamber D', and by providing the first upper guide discharge through hole 41, the second upper guide discharge through hole 42, the first lower guide discharge through hole 41', and the second lower guide discharge through hole 42', the high-pressure leakage fluid can be smoothly discharged even when the upper end cover 1 and the lower end cover 1' do not have leakage fluid outlet channels. This also reduces the contact area between rotating parts to achieve a good seal between the rotating parts, thus preventing leakage fluid from accumulating between the parts and forming a local high-pressure area, which could damage the sealing and structural relationship of the working parts.

[0051] In this embodiment, the pressure relief chamber is implemented using the following structure:

[0052] The lower surface of the upper end cover 1 is provided with a concave region 101 centered on the shaft 2, and the upper surface of the upper distribution plate 3 is provided with a concave region 301 centered on the shaft 2, which are used to form the first upper pressure relief chamber C. The upper surface of the lower end cover 1' is provided with a concave region 101' centered on the shaft 2, and the lower surface of the lower distribution plate 3' is provided with a concave region 301' centered on the shaft 2, which are used to form the first lower pressure relief chamber C'.

[0053] The first upper guide discharge through hole 41 of the upper clamping member 9 is provided with a transverse section and an axial section. The mounting hole 302 of the upper distribution plate 3 that cooperates with the upper clamping member 9 is provided with a guide ring 303 corresponding to the transverse section around the upper clamping member 9. The first lower guide discharge through hole 41 of the lower clamping member 9' is provided with a transverse section and an axial section. The mounting hole 302' of the lower distribution plate 3' that cooperates with the lower clamping member 9' is provided with a guide ring 303' corresponding to the transverse section around the lower clamping member 9'.

[0054] The upper surface of the upper thrust plate 4 is provided with a concave area 401 centered on the shaft 2, and the lower surface of the upper clamping member is embedded in the mounting hole 302 of the upper distribution plate to form the second upper pressure relief cavity D. The lower surface of the lower thrust plate 4' is provided with a concave area 401' centered on the shaft 2, and the upper surface of the lower clamping member is embedded in the mounting hole 302' of the lower distribution plate to form the second lower pressure relief cavity D'.

[0055] As shown in the diagram, in the initial state, the compression spring 7 pushes the floating pin 6 to press the upper thrust plate 4 onto the upper distribution plate 3. During operation, the relative pressure of the high-pressure fluid A further presses the upper thrust plate 4 onto the upper distribution plate 3, forming a self-tightening seal. Similarly, the reaction force of the compression spring 7, through the drive plate 5 and a step at the lower end of the shaft 2, presses the lower thrust plate 4' onto the lower distribution plate 3'. During operation, the relative pressure of the high-pressure fluid A further presses the lower thrust plate 4' onto the lower distribution plate 3', also forming a self-tightening seal. The rotating component is driven to rotate by a motor via the shaft 2. The upper and lower end faces of the rotating component, together with the lower end face of the upper distribution plate 3 and the upper end face of the lower distribution plate 3', form a frictional distribution seal pair that operates relative to each other.

[0056] The process of achieving the exchange of pressure energy between two fluids, a relatively high-pressure fluid A and a relatively low-pressure fluid B, can be divided into four steps:

[0057] Step 1: In the low-pressure zone, the relatively low-pressure fluid B enters from the relatively low-pressure fluid inlet 33 of the lower end cover 1', filling a pressure exchange pipe 8, while the fluid A in the pressure exchange pipe 8 is discharged in a low-pressure form through the relatively low-pressure fluid outlet 34 of the upper end cover 1.

[0058] Step 2: The rotor continues to rotate and enters the sealing zone. The sealing zones on the upper distribution plate 3 and the lower distribution plate 3' seal the upper and lower ports of the pressure exchange tube 8, and the fluid B remains stationary inside the pressure exchange tube 8.

[0059] Step 3: The rotor continues to rotate. When the pressure exchange tube 8 enters the high pressure zone and communicates with the relative high pressure fluid inlet 31 and the relative high pressure fluid outlet 32, the high pressure fluid A discharges the fluid B in the pressure exchange tube 8 from the relative high pressure fluid outlet 32 ​​of the lower end cover 1' in the form of high pressure. At the same time, the fluid A fills the pressure exchange tube 8.

[0060] Step 4: The rotor continues to rotate and enters another sealing zone. The sealing zones on the upper distribution plate 3 and the lower distribution plate 3' seal the upper and lower openings of the pressure exchange pipe 8, and the fluid A remains stationary inside the pressure exchange pipe 8.

[0061] In this cycle, the pressure energy exchange between the relatively high-pressure fluid A and the low-pressure fluid B is completed, and this cycle repeats cyclically. As the shaft 2 rotates, each pressure exchange pipe 8 will continuously receive and discharge water, and the relatively high-pressure fluid B discharged from multiple pressure exchange pipes 8 will be orderly superimposed at the relatively high-pressure fluid outlet 32, thereby forming a high-pressure fluid with continuous and uniform pressure and flow. The low-pressure fluid with recovered energy discharged from multiple pressure exchange pipes 8 will be orderly superimposed at the relatively low-pressure fluid A outlet 34, thereby forming a low-pressure fluid discharge with continuous and uniform pressure and flow.

[0062] The present invention uses a fluid A, fluid B, or a mixture thereof retained in the pressure exchange tube 8 as a piston; in order to reduce the mixing of fluid A and fluid B, a solid piston can be set in the rotor flow, and the piston material can be a high-molecular wear-resistant engineering plastic.

[0063] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the protection scope of the present invention.

[0064] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "connected," and "sleeve-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral construction; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In the description of this invention, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," "right," "upper," and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

Claims

1. A power-exchange energy recovery device with leakage detection function, comprising a shaft, an upper end cover, a lower end cover, and a cylindrical outer shell, wherein the upper end cover, the lower end cover, and the outer shell are connected to form a container, wherein one or multiple pressure exchange pipes are disposed inside the container or evenly disposed along the circumference of the container, the upper end cover is provided with a relatively high-pressure fluid inlet and a relatively low-pressure fluid outlet; the lower end cover is provided with a relatively high-pressure fluid outlet and a relatively low-pressure fluid inlet, and the power-exchange energy recovery device drives the pressure exchange pipes to perform circumferential motion via the shaft; characterized in that, The power exchange energy recovery device is equipped with a dedicated flow hole, which is not connected to the relatively low-pressure fluid inlet and outlet. The upper and lower end covers do not have leakage discharge channels. The container constitutes a leakage fluid collection area. A leakage fluid discharge pipe is connected to the outside of the flow hole, and a flow meter is installed on the leakage fluid discharge pipe. The rotating and non-rotating components in the upper and lower parts of the outer shell of the power exchange energy recovery device are provided with guide channels to guide the leakage fluid between the rotating and non-rotating components into the leakage fluid collection area or into the flow hole.

2. The power exchange energy recovery device with leakage detection function as described in claim 1, characterized in that, The flow hole is provided on the outer casing, and the guide channel guides the leaked liquid between the rotating component and the non-rotating component into the leaked fluid collection area. The leaked liquid discharge pipe is provided on the flow hole.

3. The power exchange energy recovery device with leakage detection function as described in claim 1, characterized in that, The rotating assembly includes an upper thrust plate and a lower thrust plate, and the non-rotating assembly includes an upper distribution plate and a lower distribution plate. Each thrust plate and distribution plate is fitted onto the shaft with a central hole. The upper distribution plate is connected to the upper end cover via an upper clamping member fitted onto the shaft, and the lower distribution plate is connected to the lower end cover via a lower clamping member fitted onto the shaft. A circumferential positioning structure prevents the upper distribution plate from rotating relative to the upper end cover, and the lower distribution plate from rotating relative to the lower end cover. The upper thrust plate is pressed against the lower surface of the upper distribution plate, and the lower thrust plate is pressed against the upper surface of the lower distribution plate. The upper end cover and the upper distribution plate are pressed together to form a first upper... The pressure relief chamber is formed by pressing the upper distribution plate and the upper thrust plate together to form a second upper pressure relief chamber. The upper clamping member is provided with a first upper guide discharge through hole, and the upper thrust plate is provided with a second upper guide discharge through hole at a position off-center from the center hole, connecting the first upper pressure relief chamber, the second upper pressure relief chamber and the inner cavity inside the outer shell to each other. The lower end cover is pressed together with the lower distribution plate to form a first lower pressure relief chamber, and the lower distribution plate is pressed together with the lower thrust plate to form a second lower pressure relief chamber. The lower clamping member is provided with a first lower guide discharge through hole, and the lower thrust plate is provided with a second lower guide discharge through hole at a position off-center from the center hole, connecting the first lower pressure relief chamber, the second lower pressure relief chamber and the inner cavity inside the outer shell to each other.

4. The power exchange energy recovery device with leakage detection function as described in claim 1, characterized in that, The container is a container without an exhaust structure.

5. A power exchange energy recovery device with leakage detection function as described in claim 1, characterized in that, The flow meter is a flow meter with a high flow limit alarm switch.

6. The power exchange energy recovery device with leakage detection function as described in claim 3, characterized in that, The lower surface of the upper end cover is provided with a concave area centered on the axis, and the upper surface of the upper distribution plate is provided with a concave area centered on the axis, which is used to form the first upper pressure relief cavity. The upper surface of the lower end cover is provided with a concave area centered on the axis, and the lower surface of the lower distribution plate is provided with a concave area centered on the axis, which is used to form the first lower pressure relief cavity. The first upper guide discharge through hole of the upper clamping member is provided with a transverse section and an axial section, and the mounting hole of the upper distribution plate that mates with the upper clamping member is provided with a guide ring corresponding to the transverse section around the upper clamping member; the first lower guide discharge through hole of the lower clamping member is provided with a transverse section and an axial section, and the mounting hole of the lower distribution plate that mates with the lower clamping member is provided with a guide ring corresponding to the transverse section around the lower clamping member; The upper surface of the upper distribution plate is provided with a concave area centered on the shaft, and the lower surface of the upper clamping member is embedded in the mounting hole of the upper distribution plate to form the second upper pressure relief cavity. The lower surface of the lower distribution plate is provided with a concave area centered on the shaft, and the upper surface of the lower clamping member is embedded in the mounting hole of the lower distribution plate to form the second lower pressure relief cavity.

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