CN116081776B - A spring return type residual pressure energy recovery device - Google Patents

Abstract

The application discloses spring return formula residual pressure can recovery unit relates to energy recuperation technical field, including rotatable core, two commutation modules and recovery module, wherein recovery module includes recovery unit, high-pressure dense sea water entry joint, low-pressure dense sea water exit joint, high-pressure sea water exit joint and low-pressure sea water entry joint, and recovery unit includes piston logical chamber, sealing baffle and piston assembly, and piston assembly includes connecting rod, first piston, second piston and elastic component. The piston through cavity can be switched between a state of communicating the high-pressure concentrated seawater inlet connector with the high-pressure seawater outlet connector and a state of communicating the low-pressure concentrated seawater outlet connector with the low-pressure seawater inlet connector through rotation of the core body. The piston is pushed by the high-pressure concentrated seawater to pressurize the low-pressure seawater, so that the residual pressure energy is recycled, the recovery of the elastic piece is utilized to realize the suction of the low-pressure seawater, the energy consumption of the pump is reduced, and the energy recovery efficiency is improved.

Description

A spring return type residual pressure energy recovery device

technical field

The present application relates to the technical field of energy recovery, in particular to a spring return type residual pressure energy recovery device.

Background technique

Nowadays, among the various seawater desalination technologies that have been invented, the reverse osmosis method using reverse osmosis membrane has quickly occupied the market due to its advantages of simple equipment, easy maintenance and equipment modularization, and has become the most widely used method.

Usually the pressure of the concentrated seawater discharged during the reverse osmosis seawater desalination process is as high as 5.0MPa-6.5MPa, and it will cause a lot of waste to directly release this part of the pressure energy. According to statistics, the loss caused by the direct release of concentrated seawater pressure energy accounts for about 30% to 50% of the total cost of water production, so it is very necessary to install a residual pressure energy recovery device.

There are mainly two working modes of the existing residual pressure energy recovery device, namely hydraulic turbine type and positive displacement type. Among them, the positive displacement residual pressure energy recovery device is based on pressure transmission for residual pressure energy recovery. This device needs to provide additional pressure through the pump to complete the residual pressure energy recovery, so it needs to consume a certain amount of electric energy to work, which increases a certain recovery cost. Also reduces the recovery efficiency.

Contents of the invention

In view of this, the purpose of this application is to provide a spring return type residual pressure energy recovery device, which reduces the energy consumption of the pump and improves the energy recovery efficiency.

In order to achieve the above technical purpose, this application provides a spring return type residual pressure energy recovery device, which includes a core body, two phase change modules and a recovery module;

The core body can be rotatably set;

The two commutation modules are fixed on both ends of the core body along the direction of the rotation centerline of the core body, and are in sealing contact with the core body;

The recovery module includes a recovery unit, a high-pressure concentrated seawater inlet connector, a low-pressure concentrated seawater outlet connector, a high-pressure seawater outlet connector, and a low-pressure seawater inlet connector;

The high-pressure seawater outlet joint is equipped with a pressure-limiting valve;

The recovery unit includes a piston cavity, a sealing baffle and a piston assembly;

The piston cavity is arranged on the core body along the rotation centerline direction of the core body;

The sealing baffle is fixed on the piston cavity, and is used to divide the piston cavity into two cavities along the rotation centerline direction of the core;

The piston assembly includes a connecting rod, a first piston, a second piston and an elastic member;

The connecting rod is movable through the sealing baffle along the rotation centerline direction of the core body, and one end is connected to the first piston, and the other end is connected to the second piston;

The elastic member is connected between the first piston and the sealing baffle or between the second piston and the sealing baffle;

The high-pressure concentrated seawater inlet joint and the low-pressure concentrated seawater outlet joint are installed on one of the phase-changing modules, and can be connected to one end of the piston cavity for conduction respectively;

The high-pressure seawater outlet joint and the low-pressure seawater inlet joint are installed on another phase-changing module, and can be connected to the other end of the piston cavity respectively;

Through the rotation of the core body, the piston cavity can communicate with the state of the high-pressure concentrated seawater inlet joint and the high-pressure seawater outlet joint at its two ends, and communicate with the low-pressure concentrated seawater outlet joint at its two ends. Toggle between states with the low pressure seawater inlet joint.

Further, the high-pressure concentrated seawater inlet joint and the low-pressure concentrated seawater outlet joint are arranged on the side of the second piston away from the first piston;

The high-pressure seawater outlet joint and the low-pressure seawater inlet joint are arranged on a side of the first piston away from the second piston;

The elastic member is connected between the second piston and the sealing baffle.

Further, there are 2n recovery units, n≥1;

The 2n recovery units are evenly distributed around the rotation center line of the core;

The high-pressure concentrated seawater inlet joint, the low-pressure concentrated seawater outlet joint, the high-pressure seawater outlet joint and the low-pressure seawater inlet joint are all m, m=n;

When half of the piston cavities in the 2n piston cavities are in the state that their two ends are respectively connected to the high-pressure concentrated seawater inlet joint and the high-pressure seawater outlet joint, the other half of the piston cavities It is in the state that its two ends are connected to the low-pressure concentrated seawater outlet joint and the low-pressure seawater inlet joint.

Further, the core body includes a rotating shaft and a core body;

The core body is detachably mounted on the rotating shaft and rotates synchronously with the rotating shaft.

Further, the phase change module includes a phase change plate and an interface end plate;

The commutation disk is provided with a plurality of first communication holes that can be connected to the piston cavity port;

The high-pressure concentrated seawater inlet joint and the low-pressure concentrated seawater outlet joint are connected and conducted in one-to-one correspondence with the first communication hole on one of the phase change modules;

The high-pressure seawater outlet joint and the low-pressure seawater inlet joint are in one-to-one connection with the first communication hole on the other phase change module;

The commutation disc is detachably mounted on the rotating shaft, and is in sealing contact with the core body and rotates synchronously;

The interface end plate is sleeved on the rotating shaft, fixed on the side of the commutation disc away from the core body, and is in sealing contact with the commutation disc;

A bearing is connected between the interface end plate and the rotating shaft;

The interface end plate is provided with a plurality of second communication holes connected and connected to the first communication holes in one-to-one correspondence;

The high-pressure concentrated seawater inlet joint and the low-pressure concentrated seawater outlet joint are respectively installed on the second communication hole of one of the phase change modules;

The high-pressure seawater outlet joint and the low-pressure seawater inlet joint are respectively installed on the second communication hole of the other phase change module.

Further, the first communicating hole is an arc-shaped hole.

Further, the side of the commutation disc facing the bearing is provided with an annular protrusion that contacts and abuts against the bearing fixing ring, so that a gap is formed between the rotating ring of the bearing and the commutation disc.

Further, the rotating shaft is a threaded shaft;

The phase change module also includes a nut threadedly engaged with the shaft;

The nut is sleeved on the rotating shaft, and is in contact with the fixed ring of the bearing, so that the commutation disc and the core body are fastened together.

Further, a washer is provided between the nut and the fixed ring of the bearing.

Further, the elastic member is a spring, sleeved on the connecting rod.

It can be seen from the above technical solutions that the spring return type residual pressure energy recovery device designed in this application, when the core body rotates to the state where the two ends of the piston cavity are respectively connected to the high-pressure concentrated seawater inlet joint and the high-pressure seawater outlet joint, the high-pressure Concentrated seawater enters the cavity on the side of the second piston in the piston through the high-pressure concentrated seawater inlet joint to push the second piston (take this as an example) to move, and at the same time drives the first piston to move through the connecting rod and deforms the elastic member, and then Pressurizing the low-pressure seawater in the cavity on one side of the first piston into high-pressure seawater, so as to realize the recovery and utilization of residual pressure energy of the high-pressure concentrated seawater. After the pressurized high-pressure seawater in the cavity reaches the preset pressure of the pressure limiting valve, it is discharged from the high-pressure seawater outlet joint, and at the same time, the high-pressure concentrated water in the other cavity is released to become low-pressure concentrated seawater. When the core rotates to the state where the two ends of the piston cavity are respectively connected to the low-pressure concentrated seawater outlet joint and the low-pressure seawater inlet joint, the elastic member in the deformed state pushes the second piston to move in the reverse direction when it is reset, and the low-pressure seawater after pressure relief Concentrated seawater is discharged from the low-pressure concentrated seawater outlet joint, and at the same time, the connecting rod pulls the first piston to move low-pressure seawater from the low-pressure seawater inlet joint, making preparations for the recovery of the next residual pressure energy.

This application uses high-pressure concentrated seawater to push the piston to deform the elastic member, pressurizes the low-pressure seawater to realize the recovery and utilization of the residual pressure energy of the high-pressure concentrated seawater, and uses the reset of the elastic member to drive the piston to draw in low-pressure seawater. Compared with the traditional residual pressure energy recovery device, there is no need to install an additional pump, which reduces the energy consumption of the pump and improves the energy recovery efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Figure 1 is the first cross-sectional view of a spring return type residual pressure energy recovery device provided in this application;

Fig. 2 is a second cross-sectional view of a spring return type residual pressure energy recovery device provided in this application;

Fig. 3 is a structural diagram of an interface end plate of a spring return type residual pressure energy recovery device provided in this application;

Fig. 4 is a schematic diagram of the cooperating structure of the commutation disk and the recovery unit of a spring-return type residual pressure energy recovery device provided in this application;

Fig. 5 is a working principle diagram of a spring return type residual pressure energy recovery device in the first phase state provided in this application;

Fig. 6 is a working principle diagram of a spring return type residual pressure energy recovery device in the second phase state provided in this application;

In the figure: 1, core body; 11, core body; 12, rotating shaft; 2, recovery unit; 21, piston cavity; 22, first piston; 23, sealing baffle; 24, connecting rod; 25, elastic member; 26. The second piston; 3. The phase change module; 31. The phase change plate; 311. The first communication hole; 312. The annular protrusion; 32. The interface end plate; 321. The second communication hole; 33. The bearing; 34. Nut; 35, gasket; 41, high-pressure seawater outlet connector; 411, pressure limiting valve; 42, high-pressure concentrated seawater inlet connector; 43, low-pressure seawater inlet connector; 44, low-pressure concentrated seawater outlet connector.

Detailed ways

The following will clearly and completely describe the technical solutions of the embodiments of the present application with reference to the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the embodiments of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer " and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore should not be construed as limiting to the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the embodiments of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a Replaceable connection, or integral connection, can be mechanical connection or electrical connection, direct connection or indirect connection through an intermediary, or internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application in specific situations.

The embodiment of the present application discloses a spring return type residual pressure energy recovery device.

Please refer to Fig. 1, Fig. 2, Fig. 5 and Fig. 6, an embodiment of a spring return type residual pressure energy recovery device provided in the embodiment of the present application includes:

Core body 1, two phase change modules 3 and recovery module.

The core body 1 can be set rotatably, and then the rotation control can be realized by a rotating motor.

Two commutation modules 3 are fixed on both ends of the core body 1 along the rotation centerline direction of the core body 1 , and are in sealing contact with the core body 1 .

As far as the design of the recovery module is concerned, it includes a recovery unit 2 , a high-pressure concentrated seawater inlet connector 42 , a low-pressure concentrated seawater outlet connector 44 , a high-pressure seawater outlet connector 41 and a low-pressure seawater inlet connector 43 .

The recovery unit 2 includes a piston cavity 21 , a sealing baffle 23 and a piston assembly.

The piston cavity 21 is arranged on the core body 1 along the direction of the rotation center line of the core body 1 , and can rotate around the rotation center line of the core body 1 as the core body 1 rotates. As far as the formation of the piston through cavity 21 is concerned, a through cavity can be opened on the core body 1 to form the piston through cavity 21, or a piston barrel is installed on the core body 1, and the inside of the piston barrel runs through the core body 1. The through chambers at both ends also form the piston through chamber 21, which is not specifically limited.

The sealing baffle 23 is fixed on the piston through cavity 21, and is used to divide the piston through cavity 21 into two cavities along the direction of the centerline of rotation of the core body 1. The middle position of 21 plays the role of installing and limiting the piston assembly.

As far as the design of the piston assembly is concerned, it includes a connecting rod 24 , a first piston 22 , a second piston 26 and an elastic member 25 . The connecting rod 24 is movable through the sealing baffle 23 along the direction of the centerline of rotation of the core body 1, and one end is connected with the first piston 22, and the other end is connected with the second piston 26; the first piston 22 and the second piston 26 should be connected with each other. The inner wall of the piston cavity 21 is in close contact to achieve a sealing effect so as to isolate different fluids. The piston structure can refer to the existing piston structure design without limitation. As far as the elastic member 25 is concerned, it may be connected between the first piston 22 and the sealing baffle 23 or between the second piston 26 and the sealing baffle 23 .

The high-pressure concentrated seawater inlet connector 42 and the low-pressure concentrated seawater outlet connector 44 are installed on a phase change module 3 , and can be connected to one end of the piston cavity 21 for conduction respectively. The high-pressure seawater outlet connector 41 and the low-pressure seawater inlet connector 43 are installed on another phase change module 3 , and can be connected to the other end of the piston cavity 21 for conduction.

Through the rotation of the core body 1, the piston cavity 21 can communicate with the state of the high-pressure concentrated seawater inlet joint 42 and the high-pressure seawater outlet joint 41 at its two ends, and communicate with the low-pressure concentrated seawater outlet joint 44 and the low-pressure seawater inlet joint at its two ends. 43 states to switch between.

The two ends of the piston cavity 21 are respectively connected to the high-pressure concentrated seawater inlet joint 42 and the high-pressure seawater outlet joint 41 as the first phase state, and the two ends of the piston cavity 21 are respectively connected to the low-pressure concentrated seawater outlet joint 44 and the low-pressure seawater inlet. The state of the joint 43 is regarded as the second phase state, that is, the piston cavity 21 can be switched between the first phase state and the second phase state through the rotation of the core body 1 .

Specifically, as shown in Figures 1 and 2, the high-pressure concentrated seawater inlet joint 42 and the low-pressure concentrated seawater outlet joint 44 may be arranged on the side of the second piston 26 away from the first piston 22, then the high-pressure seawater outlet joint 41 and the The low-pressure seawater inlet joint 43 is also arranged on the side of the first piston 22 away from the second piston 26; from the left and right side distribution, since the first piston 22 and the second piston 26 are left and right, the high pressure concentrated The seawater inlet joint 42 and the low-pressure concentrated seawater outlet joint 44 are arranged on the right side, while the high-pressure seawater outlet joint 41 and the low-pressure seawater inlet joint 43 are also arranged on the left side, and the corresponding elastic member 25 can be connected to the second piston 26 And between the sealing baffle 23. Taking this distribution as an example, the specific workflow is as follows:

As shown in Figure 5, when the piston cavity 21 is in the first phase state, the high-pressure concentrated seawater enters the right side of the second piston 26 of the piston cavity 21 through the high-pressure concentrated seawater inlet joint 42 to push the second piston 26 to move, and simultaneously passes The connecting rod 24 drives the first piston 22 to move to the left and compresses the elastic member 25, thereby pressurizing the low-pressure seawater in the left side of the first piston 22 into high-pressure seawater, realizing the recovery and utilization of residual pressure energy of the high-pressure concentrated seawater. After the pressurized high-pressure seawater in the cavity reaches the preset pressure of the pressure limiting valve 411, it is discharged from the high-pressure seawater outlet joint 41, and at the same time, the high-pressure concentrated water in the right side of the second piston 26 is decompressed into low-pressure concentrated seawater.

As shown in Figure 6, the motor drives the core body 1 to rotate. When the piston cavity 21 switches from the first phase state to the second phase state, the elastic member 25 in the compressed state resets and pushes the second piston 26 to move to the right, and the leakage The low-pressure concentrated seawater obtained after decompression is pushed to the low-pressure concentrated seawater outlet joint 44 to be discharged, while the second piston 26 moves and pulls the first piston 22 through the connecting rod 24 to move, and the low-pressure seawater is inhaled from the low-pressure seawater inlet joint 43, for the next Pressure energy recovery is ready.

This application uses high-pressure concentrated seawater to push the piston to deform the elastic member 25, pressurizes the low-pressure seawater to realize the recovery and utilization of residual pressure energy of the high-pressure concentrated seawater, and uses the reset of the elastic member 25 to drive the piston to draw in low-pressure seawater. Compared with the traditional residual pressure energy recovery device, there is no need to install an additional pump, which reduces the energy consumption of the pump and improves the energy recovery efficiency.

The above is the first embodiment of a spring return type residual pressure energy recovery device provided by the embodiment of the present application, and the following is the second embodiment of a spring return type residual pressure energy recovery device provided by the embodiment of the present application. Please refer to the figure for details 1 to 6.

Based on the scheme of the first embodiment above:

Further, in order to improve the recycling efficiency, the recycling unit 2 can be designed as 2n, n≥1 and is a natural number, that is, the recycling unit 2 can be designed as a multiple of 2, then 2n recycling units 2 around the core body 1 The circumference of the centerline of rotation of the core body is evenly distributed, that is, the 2n piston cavities 21 are evenly distributed around the circumference of the centerline of rotation of the core body 1.

Correspondingly, there are m high-pressure concentrated seawater inlet connectors 42, low-pressure concentrated seawater outlet connectors 44, high-pressure seawater outlet connectors 41, and low-pressure seawater inlet connectors 43, where m=n. When half of the piston cavities 21 in the 2n piston cavities 21 are in the state that their two ends are respectively connected to the high-pressure concentrated seawater inlet joint 42 and the high-pressure seawater outlet joint 41, the other half of the piston cavities 21 are in their own two ends. The state of the low-pressure concentrated seawater outlet joint 44 and the low-pressure seawater inlet joint 43.

Taking four recovery units 2 as an example, there are two high-pressure concentrated seawater inlet joints 42, low-pressure concentrated seawater outlet joints 44, high-pressure seawater outlet joints 41 and low-pressure seawater inlet joints 43, and the circumferences of the four piston cavities 21 are evenly arranged on On the core body 1, two high-pressure concentrated seawater inlet connectors 42 and two low-pressure concentrated seawater outlet connectors 44 are alternately arranged around the rotation centerline of the core body 1, and the two high-pressure seawater outlet connectors 41 and two low-pressure seawater inlet connectors 43 are also similarly arranged. Arranged in a staggered manner around the centerline of rotation of the core body 1 . When the piston passages 21 in the two recovery units 2 are in the first phase state, the piston passages 21 in the other two recovery units 2 are also in the second phase state, realizing the first phase state and the second phase state At the same time, that is, every time the core body 1 rotates 90°, it can switch between the first phase state and the second phase state, and then every time it rotates 180°, the elastic member 25 can complete a deformation recovery, so that the recovery unit 2 is completed. One working cycle, one rotation can complete two working cycles, which improves the efficiency better.

Further, as far as the structural design of the core body 1 is concerned, it includes a rotating shaft 12 and a core body 11. The core body 11 is detachably mounted on the rotating shaft 12 and rotates synchronously with the rotating shaft 12. The piston cavity 21 is arranged on the core body 11. The central axis of the rotating shaft 12 also forms the aforementioned rotational centerline of the core body 1 . The rotating shaft 12 can be connected with the driving wheel of the motor through a belt, so as to be driven by the motor to rotate, and then drive the core body 11 to rotate. And the structure of the core body 11 can be an annular barrel structure, which is completely sleeved on the rotating shaft 12 and driven by the rotating shaft 12 to realize rotation; of course, the core body 11 can also be a single box structure, which is directly fixed on the rotating shaft 12, and its The number is the same as the number of recovery units 2, that is, as many recovery units 2 as there are core bodies 11, there is no specific limitation.

Further, the commutation module 3 includes a commutation disc 31 and an interface end disc 32 .

The phase change disc 31 is provided with a plurality of first communication holes 311 that can be connected to the port of the piston cavity 21; 311 are connected and conducted in one-to-one correspondence; the high-pressure seawater outlet joint 41 and the low-pressure seawater inlet joint 43 are connected and conducted with the first communication hole 311 on the other phase change module 3 in a one-to-one correspondence.

Taking the rotating shaft 12 as an example, the commutation disk 31 is detachably mounted on the rotating shaft 12 , and is in sealing contact with the core 1 and rotates synchronously.

The interface end plate 32 is sleeved on the rotating shaft 12 , and is fixed on the side of the commutation disc 31 away from the core body 11 , and is in sealing contact with the commutation disc 31 .

A bearing 33 is connected between the interface end plate 32 and the rotating shaft 12 , so as to ensure that the interface end plate 32 can smoothly rotate relative to the commutation plate 31 . A bearing hole is provided in the middle of the interface end plate 32 to facilitate the installation of the bearing 33 . The matching design of the interface end plate 32 and the commutation disc 31 makes the interface shapes of the low-pressure seawater inlet joint 43, the high-pressure seawater outlet joint 41, the low-pressure concentrated seawater inlet joint and the high-pressure concentrated seawater outlet joint not follow the first one in the commutation disc 31. The shape of the communication hole 311 is adjusted. In addition, by providing the interface end plate 32, the installation and arrangement of the low-pressure seawater inlet joint 43, the high-pressure seawater outlet joint 41, the low-pressure concentrated seawater inlet joint and the high-pressure concentrated seawater outlet joint are more convenient.

The interface end plate 32 is provided with a plurality of second communication holes 321 connected to the first communication holes 311 in one-to-one correspondence; the high-pressure concentrated seawater inlet joint 42 and the low-pressure concentrated seawater outlet joint 44 are installed in a phase change module in one-to-one correspondence 3 on the second communication hole 321. The high-pressure seawater outlet connector 41 and the low-pressure seawater inlet connector 43 are installed on the second communication hole 321 of the other phase change module 3 correspondingly.

Furthermore, the first communication hole 311 is preferably designed as an arc-shaped hole. The arc-shaped hole design can prolong the available time for fluid pressure transmission in the piston cavity 21, so that the pressure transmission in the fluid is more sufficient, and at the same time shorten the idle time. The gear time refers to the phase change of the pressure limiting valve 411, the low-pressure seawater inlet joint 43, the high-pressure seawater outlet joint 41, the low-pressure concentrated seawater inlet joint, and the high-pressure concentrated seawater outlet joint on both sides of the core body 1 during the rotation of the core body 1. The residence time of the part between the first communication holes 311 in the disk 31 can improve the recovery efficiency of residual pressure energy by shortening the idle time.

Specifically, the piston cavity 21 can be a cylindrical cavity, so its two ports are circular ports, the first communication hole 311 can be an arc-shaped hole with a size larger than the port of the cylindrical cavity, and the second communication hole 321 can be connected to the cylindrical cavity port. The circular hole matched with the cylindrical through hole port, the fluid coming out from the piston cavity 21 first flows through the first communicating hole 311 and then flows through the second communicating hole 321, and the arc-shaped hole design of the first communicating hole 311 is also It is possible to prolong the pressure transmission time of the fluid.

In addition, when designing, it should be noted that the size of the gap between the first communication holes 311 is larger than the size of the port of the piston cavity 21 and the size of the second communication hole 321, so as to ensure that the gap can completely block the port of the piston cavity 21 and the The second communication hole 321 prevents fluid communication between two adjacent piston through chambers 21 . The gap between the second communication holes 321 prevents the fluid from flowing out from the first communication holes 311 during the rotation of the core body 1 , thereby preventing leakage.

Further, on the side of the commutation disk 31 facing the bearing 33 , there is an annular protrusion 312 which is in contact with the fixed ring of the bearing 33 , so that a gap is formed between the rotating ring of the bearing 33 and the commutation disk 31 . Thus, contact wear between the commutation disk 31 and the bearing 33 can be avoided.

Further, the rotating shaft 12 can be designed as a threaded shaft, which can be designed with a partial threaded shaft section or a full threaded shaft section, without limitation. Correspondingly, the phase change module 3 also includes a nut 34 threadedly engaged with the rotating shaft 12, and the number of the nuts 34 is preferably two; the nut 34 is sleeved on the rotating shaft 12, and is in contact with the fixed ring of the bearing 33, so that The commutation disc 31 is fastened together with the core body 11 . The setting of the nut 34 also makes the overall installation and coordination more convenient, and the maintenance is more convenient.

In this application, the interface end plate 32 is in sealing contact with the commutation disc 31 but is in relative rotational fit, while the core body 11 and the commutation disc 31 are in sealed contact but in synchronous rotational fit, and the interface end disc 32 is connected to the corresponding The seawater inlet and outlet joints are in a fixed state, and when the core body 1 and the commutation disk 31 rotate, they also rotate relative to the interface end disk 32 . The core body 1 and the commutation disk 31 can rotate synchronously with the rotating shaft 12 through the keyway fit, and also meet the detachable design in the axial direction, and there is no specific limitation.

Further, a washer 35 is provided between the nut 34 and the fixed ring of the bearing 33 , and the washer 35 can be designed with elastic material without limitation.

Further, as far as the design of the elastic member 25 is concerned, it can be a spring, sleeved on the connecting rod 24 .

The above is a detailed introduction of a spring return type residual pressure energy recovery device provided by this application. For those of ordinary skill in the art, according to the idea of the embodiment of this application, there will be changes in the specific implementation and application range. In summary, the contents of this specification should not be construed as limiting the application.

Claims (5)

1. A spring return type residual pressure energy recovery device, characterized in that it includes a core (1), two phase change modules (3) and a recovery module; The core (1) can be set rotatably; The two commutation modules (3) are fixed on both ends of the core (1) along the rotation centerline of the core (1), and are in sealing contact with the core (1); The recovery module includes a recovery unit (2), a high-pressure concentrated seawater inlet connector (42), a low-pressure concentrated seawater outlet connector (44), a high-pressure seawater outlet connector (41) and a low-pressure seawater inlet connector (43); The high-pressure seawater outlet joint (41) is equipped with a pressure limiting valve (411); The recovery unit (2) includes a piston cavity (21), a sealing baffle (23) and a piston assembly; The piston cavity (21) is arranged on the core body (1) along the direction of the rotation centerline of the core body (1); The sealing baffle (23) is fixed on the piston cavity (21), and is used to divide the piston cavity (21) into two cavities along the rotation centerline direction of the core (1); The piston assembly includes a connecting rod (24), a first piston (22), a second piston (26) and an elastic member (25); The connecting rod (24) is movable through the sealing baffle (23) along the rotation centerline direction of the core body (1), and one end is connected with the first piston (22), and the other end is connected with the The second piston (26) is connected; The elastic member (25) is connected between the first piston (22) and the sealing baffle (23) or between the second piston (26) and the sealing baffle (23); The high-pressure concentrated seawater inlet joint (42) and the low-pressure concentrated seawater outlet joint (44) are installed on one of the phase-changing modules (3), and are respectively connected to one end of the piston cavity (21). ; The high-pressure seawater outlet joint (41) and the low-pressure seawater inlet joint (43) are installed on the other phase change module (3), and are respectively connected to the other end of the piston cavity (21). ; Through the rotation of the core body (1), the piston cavity (21) can communicate with the state of the high-pressure concentrated seawater inlet joint (42) and the high-pressure seawater outlet joint (41) respectively at its two ends, and The two ends of itself are respectively connected to the state of the low-pressure concentrated seawater outlet joint (44) and the low-pressure seawater inlet joint (43) to switch between states; The core (1) includes a rotating shaft (12) and a core body (11); The core body (11) is detachably mounted on the rotating shaft (12), and rotates synchronously with the rotating shaft (12); The phase change module (3) includes a phase change plate (31) and an interface end plate (32); The commutation disk (31) is provided with a plurality of first communication holes (311) connected and conducted with the port of the piston cavity (21); The high-pressure concentrated seawater inlet joint (42) and the low-pressure concentrated seawater outlet joint (44) are connected and connected to the first communication hole (311) on one of the phase-changing modules (3) in a one-to-one correspondence; The high-pressure seawater outlet joint (41) and the low-pressure seawater inlet joint (43) are in one-to-one connection with the first communication hole (311) on the other phase change module (3); The commutation disc (31) is detachably mounted on the rotating shaft (12), and is in sealing contact with the core (1) and rotates synchronously; The interface end disc (32) is set on the rotating shaft (12), and fixed on the side of the commutation disc (31) away from the core body (11), and is connected with the commutation disc (31) ) sealing contact; A bearing (33) is connected between the interface end plate (32) and the rotating shaft (12); The interface end plate (32) is provided with a plurality of second communication holes (321) connected and connected to the first communication holes (311) in one-to-one correspondence; The high-pressure concentrated seawater inlet joint (42) and the low-pressure concentrated seawater outlet joint (44) are installed on the second communication hole (321) of one phase change module (3) correspondingly; The high-pressure seawater outlet joint (41) and the low-pressure seawater inlet joint (43) are installed on the second communication hole (321) of the other phase change module (3) in one-to-one correspondence; The first communicating hole (311) is an arc-shaped hole; The side of the commutation disk (31) facing the bearing (33) is provided with an annular protrusion (312) that is in contact with the fixed ring of the bearing (33), so that the rotating ring of the bearing (33) A gap is formed with the commutation disk (31); The rotating shaft (12) is a threaded shaft; The phase change module (3) further includes a nut (34) threadedly engaged with the rotating shaft (12); The nut (34) is sheathed on the rotating shaft (12), and is in contact with the fixed ring of the bearing (33), so that the commutation disc (31) is tightly connected to the core body (11). Solid together. 2. A spring-return type residual pressure energy recovery device according to claim 1, characterized in that, the high-pressure concentrated seawater inlet joint (42) and the low-pressure concentrated seawater outlet joint (44) are arranged on the second The side of the second piston (26) facing away from the first piston (22); The high-pressure seawater outlet joint (41) and the low-pressure seawater inlet joint (43) are arranged on a side of the first piston (22) away from the second piston (26); The elastic member (25) is connected between the second piston (26) and the sealing baffle (23). 3. A spring return type residual pressure energy recovery device according to claim 1, characterized in that there are 2n recovery units (2), n≥1; 2n recovery units (2) are evenly distributed around the rotation center line of the core (1); The high-pressure concentrated seawater inlet joint (42), the low-pressure concentrated seawater outlet joint (44), the high-pressure seawater outlet joint (41) and the low-pressure seawater inlet joint (43) are all m, m=n; When half of the 2n piston cavities (21) are at their own two ends, they are respectively connected to the high-pressure concentrated seawater inlet joint (42) and the high-pressure seawater outlet joint (41) state, the other half of the piston through chambers (21) are in a state where both ends of themselves are connected to the low-pressure concentrated seawater outlet joint (44) and the low-pressure seawater inlet joint (43). 4. A spring return type residual pressure energy recovery device according to claim 1, characterized in that, a washer (35) is provided between the nut (34) and the fixed ring of the bearing (33) . 5 . The spring return type residual pressure energy recovery device according to claim 1 , characterized in that, the elastic member ( 25 ) is a spring and is sheathed on the connecting rod ( 24 ). 5 .

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