CN118361663B - A pressure accumulator type pressure energy recovery device - Google Patents

Abstract

The application discloses a pressure accumulating type pressure energy recovery device, which relates to the technical field of energy recovery and comprises an external pipeline module, a pressure exchange module and an internal pipeline module. The external pipeline module is provided with a high-pressure concentrated seawater input pipeline, a pressure release concentrated seawater output pipeline and a medium-pressure concentrated seawater exchange pipeline, and the internal pipeline module is provided with a low-pressure seawater input pipeline, a high-pressure seawater output pipeline and a medium-pressure seawater exchange pipeline; the pressure exchange module is provided with a pressure exchange cavity group; the pressure exchange cavity group comprises a first-stage pressure exchange cavity and a second-stage pressure exchange cavity; the primary pressure exchange cavity and the secondary pressure exchange cavity are respectively provided with a piston; the primary pressure exchange cavity is also provided with a primary elastic piece connected with the piston; the secondary pressure exchange cavity is also provided with a secondary elastic piece which is connected with the piston and has elastic acting force lower than that of the primary elastic piece. The scheme of the application can realize the secondary recovery of the residual pressure energy and improve the recovery efficiency of the residual pressure energy.

Description

A pressure accumulator type pressure energy recovery device

Technical Field

The present application relates to the field of energy recovery technology, and in particular to a pressure storage type pressure energy recovery device.

Background Art

At present, there are two main working modes of residual pressure energy recovery devices, namely centrifugal and positive displacement. The traditional centrifugal residual pressure energy recovery device can only achieve single-stage recovery and utilization of residual pressure energy, so the energy recovery efficiency is only 30%~50%, which is low. The positive displacement energy recovery device, which dominates the market, has an energy recovery efficiency of up to 90%. However, this device requires frequent opening and closing of multiple valves during operation, which can easily lead to water hammer, damage the entire device, shorten the service life of the device, and increase the recovery cost.

Therefore, there is an urgent need to provide new recycling solutions that can both improve energy recovery efficiency and reduce recycling costs.

Summary of the invention

In view of this, the purpose of the present application is to provide a pressure storage type pressure energy recovery device, which can both improve the energy recovery efficiency and reduce the recovery cost.

In order to achieve the above technical purpose, the present application provides a pressure storage type pressure energy recovery device, including an external pipeline module, a pressure exchange module and an internal pipeline module;

The internal pipeline module is fixedly installed in the external pipeline module;

The pressure exchange module is rotatably installed between the external pipeline module and the internal pipeline module;

The external piping module includes an external module body;

The external module body is provided with a high-pressure concentrated seawater input pipeline, a pressure-relieved concentrated seawater output pipeline and a medium-pressure concentrated seawater exchange pipeline;

The internal piping module includes an internal module body;

The internal module body is provided with a low-pressure seawater input pipeline, a high-pressure seawater output pipeline and a medium-pressure seawater exchange pipeline;

The medium-pressure seawater exchange pipeline is provided with an exchange pressure-limiting valve;

An output pressure limiting valve is provided in the high-pressure seawater output pipeline;

The pressure exchange module includes an exchange module body;

The exchange module body is provided with a pressure exchange chamber group;

The pressure exchange chamber group includes a primary pressure exchange chamber and a secondary pressure exchange chamber;

The first-level pressure exchange chamber and the second-level pressure exchange chamber are both provided with pistons;

The first-level pressure exchange chamber is also provided with a first-level elastic member connected to the piston;

The secondary pressure exchange chamber is also provided with a secondary elastic member connected to the piston and having an elastic force lower than that of the primary elastic member;

The primary elastic member is configured to be elastically deformable as the connected piston moves;

The secondary elastic member is configured to be elastically deformable as the connected piston moves;

When the exchange module body rotates to the first phase, the two ends of the primary pressure exchange chamber are respectively connected to the high-pressure concentrated seawater input pipeline and the high-pressure seawater output pipeline, and the two ends of the secondary pressure exchange chamber are respectively connected to the pressure relief concentrated seawater output pipeline and the low-pressure seawater input pipeline;

When the exchange module body rotates to the second phase, the two ends of the primary pressure exchange chamber are respectively connected to the medium-pressure concentrated seawater exchange pipeline and one end of the medium-pressure seawater exchange pipeline, and the two ends of the secondary pressure exchange chamber are respectively connected to the medium-pressure concentrated seawater exchange pipeline and the other end of the medium-pressure seawater exchange pipeline.

Furthermore, the number of pairs of the pressure exchange chamber groups is 2n pairs;

The number of the high-pressure concentrated seawater input pipeline, the pressure-relieved concentrated seawater output pipeline, the medium-pressure concentrated seawater exchange pipeline, and the medium-pressure seawater exchange pipeline is 2n;

Wherein, n≥1 and is an integer.

Furthermore, 2n pairs of pressure exchange chamber groups are arranged circumferentially and/or longitudinally.

Further, the n is 1;

There are four pressure exchange chamber groups, which are distributed around the internal module body at intervals of 90°;

The first-stage pressure exchange chamber of the pair of centrally symmetrical pressure exchange chamber groups forms a first first-stage pressure exchange chamber, and the second-stage pressure exchange chamber forms a first second-stage pressure exchange chamber;

The first-level pressure exchange chamber of another pair of the pressure exchange chamber groups that are centrally symmetrical forms a second first-level pressure exchange chamber, and the second-level pressure exchange chamber forms a second second-level pressure exchange chamber;

The number of the high-pressure concentrated seawater input pipeline, the pressure-relieved concentrated seawater output pipeline, the medium-pressure concentrated seawater exchange pipeline, and the medium-pressure seawater exchange pipeline is two;

The two high-pressure concentrated seawater input pipelines are centrally symmetrically distributed;

The two medium-pressure concentrated seawater exchange pipelines are centrally symmetrically distributed and are 90° apart from the two high-pressure concentrated seawater input pipelines;

The two pressure-relieved concentrated seawater output pipelines are centrally symmetrically distributed;

The two medium-pressure seawater exchange pipes are centrally symmetrically distributed and are 90° apart from the two pressure-relief concentrated seawater output pipes;

When the exchange module body rotates to the first phase, the two second-level pressure exchange chambers are respectively connected to one of the high-pressure concentrated seawater input pipelines, and the two second-level pressure exchange chambers are respectively connected to one of the pressure-relieved concentrated seawater output pipelines and one of the low-pressure seawater input pipelines; at the same time, the two first-level pressure exchange chambers are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines and one of the medium-pressure seawater exchange pipelines, and at the same time, the two first-level pressure exchange chambers are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines and one of the medium-pressure seawater exchange pipelines;

When the exchange module body rotates to the second phase, the two first-level pressure exchange chambers are respectively connected to one of the high-pressure concentrated seawater input pipelines, and the two first-level pressure exchange chambers are respectively connected to one of the pressure-relieved concentrated seawater output pipelines and one of the low-pressure seawater input pipelines; at the same time, the two second-level pressure exchange chambers are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines and one of the medium-pressure seawater exchange pipelines, and at the same time, the two second-level pressure exchange chambers are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines and one of the medium-pressure seawater exchange pipelines.

Furthermore, the primary pressure exchange chamber is arranged above the secondary pressure exchange chamber.

Furthermore, the output pressure limiting valve is arranged at the inlet of the high-pressure seawater output pipeline.

Furthermore, the exchange pressure limiting valve is arranged at the inlet of the medium-pressure seawater exchange pipeline.

Furthermore, the exchange module body is connected to an external motor and is driven to rotate by the external motor.

Further, the primary elastic member is a compression spring;

A primary annular gasket is fixed at one end of the primary pressure exchange chamber;

One end of the primary elastic member is fixed in the primary annular gasket, and the other end is fixed to a side surface of the piston in the primary pressure exchange chamber;

The primary annular gasket can contact and abut against a side surface of the piston.

Further, the secondary elastic member is a compression spring;

A secondary annular gasket is fixed at one end of the secondary pressure exchange chamber;

One end of the secondary elastic member is fixed in the secondary annular gasket, and the other end is fixed to a side surface of the piston in the secondary pressure exchange chamber;

The secondary annular gasket can contact and abut against a side surface of the piston.

It can be seen from the above technical scheme that in the pressure storage type pressure energy recovery device of the present application, when the exchange module body rotates to the first phase, the high-pressure concentrated seawater input through the high-pressure concentrated seawater input pipeline can drive the piston movement in the primary pressure exchange chamber, so that the medium-pressure seawater in the primary pressure exchange chamber is pressurized to high-pressure seawater and then output through the high-pressure seawater output pipeline; at the same time, the secondary elastic member in the secondary pressure exchange chamber restores the deformation process to drive the piston movement to output the pressure-relieved concentrated seawater in the secondary pressure exchange chamber from the pressure-relieved concentrated seawater output pipeline, and the negative pressure generated at the same time sucks the low-pressure seawater from the low-pressure seawater input pipeline. When the exchange module body rotates to the second phase, the primary elastic member in the primary pressure exchange chamber restores the deformation process, and the medium-pressure concentrated seawater in the primary pressure exchange chamber that has undergone one pressure exchange is pressed into the secondary pressure exchange chamber through the medium-pressure concentrated seawater exchange pipeline, so that the low-pressure seawater in the secondary pressure exchange chamber is pressurized to medium-pressure seawater and enters the primary pressure exchange chamber through the medium-pressure seawater exchange pipeline. Compared with traditional residual pressure energy recovery devices, the pressure storage type pressure energy recovery device of the present application can realize secondary recovery of residual pressure energy, thereby improving the efficiency of residual pressure energy recovery; at the same time, the pressure exchange chamber can adopt corresponding numbers and corresponding longitudinal layers according to needs, so as to realize flexible arrangement to meet various working occasions, improve space utilization and save recovery costs.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is an upper cross-sectional view of a pressure accumulator type pressure energy recovery device provided in the present application;

FIG2 is a cross-sectional view of the lower layer of a pressure accumulator type pressure energy recovery device provided in the present application;

FIG3 is a side vertical cross-sectional view of a pressure storage type pressure energy recovery device provided in the present application when it is connected to the outside;

FIG4 is a side vertical cross-sectional view of a pressure accumulator type pressure energy recovery device provided in the present application when the internal parts are connected;

FIG5 is a schematic diagram of the first phase/third phase operation of a pressure accumulator pressure energy recovery device provided in the present application;

FIG6 is a schematic diagram of the second phase/fourth phase operation of a pressure accumulator type pressure energy recovery device provided in the present application;

In the figure: 1. External module body; 2. Exchange module body; 3. Internal module body; 4-1. First level pressure exchange chamber; 4-2. Second level pressure exchange chamber; 5. Medium-pressure concentrated seawater exchange pipeline; 6. Piston; 7. First level elastic member; 8. Medium-pressure seawater exchange pipeline; 9-1. First level annular gasket; 9-2. Second level annular gasket; 10. High-pressure concentrated seawater input pipeline; 11. High-pressure seawater output pipeline; 12. Second level elastic member; 13-1. First level pressure exchange chamber; 13-2. Second level pressure exchange chamber; 14. Low-pressure seawater input pipeline; 15. Pressure relief concentrated seawater output pipeline; 16-1. Exchange pressure limiting valve; 16-2. Output pressure limiting valve.

DETAILED DESCRIPTION

The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection 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", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

The embodiment of the present application discloses a pressure storage type pressure energy recovery device.

Referring to FIG. 1 to FIG. 4 , an embodiment of a pressure accumulator type pressure energy recovery device provided in the embodiments of the present application includes:

External piping module, pressure exchange module and internal piping module.

As shown in Figures 1 and 2, the internal pipe module is fixedly installed in the external pipe module, and the pressure exchange module is rotatably installed between the external pipe module and the internal pipe module. The internal pipe module, the pressure exchange module and the external pipe module are all cylindrical, so that the whole is cylindrical. The cylindrical design can make the pressure exchange module and the external pipe module and the internal pipe module fit more closely, thereby improving the sealing.

The external pipeline module design includes an external module body 1, which is a hollow cylindrical solid structure and is not specifically limited; the external module body 1 is provided with a high-pressure concentrated seawater input pipeline 10, a pressure-relieved concentrated seawater output pipeline 15 and a medium-pressure concentrated seawater exchange pipeline 5.

As for the design of the internal pipeline module, it includes an internal module body 3, which is a cylindrical solid structure and is not specifically limited; the internal module body 3 is provided with a low-pressure seawater input pipeline 14, a high-pressure seawater output pipeline 11 and a medium-pressure seawater exchange pipeline 8; the medium-pressure seawater exchange pipeline 8 is provided with an exchange pressure limiting valve 16-1; the high-pressure seawater output pipeline 11 is provided with an output pressure limiting valve 16-2.

As shown in FIG3 and FIG4, for the design of the pressure exchange module, it includes an exchange module body 2, which is a hollow cylindrical solid structure, and is not specifically limited; a pressure exchange chamber group is provided on the exchange module body 2; the pressure exchange chamber group includes a primary pressure exchange chamber and a secondary pressure exchange chamber; a piston 6 is provided in both the primary pressure exchange chamber and the secondary pressure exchange chamber; a primary elastic member 7 connected to the piston 6 is also provided in the primary pressure exchange chamber; a secondary elastic member 12 connected to the piston 6 and having an elastic force lower than the primary elastic member 7 is also provided in the secondary pressure exchange chamber. It can be understood that the primary elastic member 7 is a high-elastic elastic member, and the secondary elastic member 12 is a low-elastic elastic member.

The primary elastic member 7 is configured to be elastically deformed as the connected piston 6 moves; the secondary elastic member 12 is configured to be elastically deformed as the connected piston 6 moves.

When the exchange module body 2 rotates to the first phase, the two ends of the primary pressure exchange chamber are connected to the high-pressure concentrated seawater input pipeline 10 and the high-pressure seawater output pipeline 11 respectively, and the two ends of the secondary pressure exchange chamber are connected to the pressure relief concentrated seawater output pipeline 15 and the low-pressure seawater input pipeline 14 respectively.

When the exchange module body 2 rotates to the second phase, the two ends of the primary pressure exchange chamber are connected to the medium-pressure concentrated seawater exchange pipeline 5 and one end of the medium-pressure seawater exchange pipeline 8 respectively, and the two ends of the secondary pressure exchange chamber are connected to the medium-pressure concentrated seawater exchange pipeline 5 and the other end of the medium-pressure seawater exchange pipeline 8 respectively.

It should be noted that, during the phase exchange process of the pressure storage pressure energy recovery device designed in the present application, the inlet and outlet of each pressure exchange chamber are respectively connected to the internal module body 3 and the external module body 1 to achieve complete closure of the chamber.

In the pressure storage type pressure energy recovery device of the present application, when the exchange module body 2 rotates to the first phase, the high-pressure concentrated seawater input through the high-pressure concentrated seawater input pipeline 10 can push the piston 6 in the primary pressure exchange chamber to move, so that the medium-pressure seawater in the primary pressure exchange chamber is pressurized to high-pressure seawater and then output through the high-pressure seawater output pipeline 11; at the same time, the secondary elastic member 12 in the secondary pressure exchange chamber restores the deformation process to drive the piston 6 to output the decompressed concentrated seawater in the secondary pressure exchange chamber from the decompressed concentrated seawater output pipeline 15, and the negative pressure generated at the same time sucks the low-pressure seawater from the low-pressure seawater input pipeline 14. When the exchange module body 2 rotates to the second phase, the primary elastic member 7 in the primary pressure exchange chamber restores the deformation process, and the medium-pressure concentrated seawater in the primary pressure exchange chamber that has undergone one pressure exchange is pressed into the secondary pressure exchange chamber through the medium-pressure concentrated seawater exchange pipeline 5, so that the low-pressure seawater in the secondary pressure exchange chamber is pressurized to medium-pressure seawater and enters the primary pressure exchange chamber through the medium-pressure seawater exchange pipeline 8. Compared with traditional residual pressure energy recovery devices, the pressure storage type pressure energy recovery device of the present application can realize secondary recovery of residual pressure energy, thereby improving the efficiency of residual pressure energy recovery; at the same time, the pressure exchange chamber can adopt corresponding numbers and corresponding longitudinal layers according to needs, so as to realize flexible arrangement to meet various working occasions, improve space utilization and save recovery costs.

The above is Example 1 of a pressure storage type pressure energy recovery device provided in an embodiment of the present application. The following is Example 2 of a pressure storage type pressure energy recovery device provided in an embodiment of the present application. Please refer to Figures 1 to 6 for details.

Based on the solution of the above embodiment 1:

Furthermore, in order to further improve the efficiency of residual pressure energy recovery, the number of pairs of pressure exchange chamber groups is designed to be 2n pairs; correspondingly, the number of high-pressure concentrated seawater input pipelines 10, pressure-relief concentrated seawater output pipelines 15, medium-pressure concentrated seawater exchange pipelines 5, and medium-pressure seawater exchange pipelines 8 are all 2n, that is, the number of each pipeline must match the number of pressure exchange chambers; wherein n≥1 and is an integer.

Furthermore, 2n pairs of pressure exchange chamber groups are arranged circumferentially and/or longitudinally. Taking 2 pairs of pressure exchange chamber groups as an example, there are four pressure exchange chamber groups, and the four pressure exchange chamber groups can be distributed circumferentially; taking 4 pairs of pressure exchange chamber groups as an example, there are eight pressure exchange chamber groups, and in this case, they can be arranged in upper and lower layers, with four pressure exchange chamber groups arranged in the upper layer and the other four pressure exchange chamber groups arranged in the lower layer. The specific design can be changed according to actual needs without limitation.

Further, taking n as 1 as an example:

That is, there are four pressure exchange chamber groups, and the four pressure exchange chamber groups are distributed around the internal module body 3 at intervals of 90°.

For the convenience of explanation, the primary pressure exchange chamber of a pair of centrally symmetrical pressure exchange chamber groups is referred to as the first primary pressure exchange chamber 4-1, and the secondary pressure exchange chamber thereof is referred to as the first secondary pressure exchange chamber 13-1.

The primary pressure exchange chamber of another centrally symmetrical pair of pressure exchange chamber groups serves as the second primary pressure exchange chamber 4 - 2 , and the secondary pressure exchange chamber thereof serves as the second secondary pressure exchange chamber 13 - 2 .

Correspondingly, the number of the high-pressure concentrated seawater input pipeline 10 , the pressure-relieved concentrated seawater output pipeline 15 , the medium-pressure concentrated seawater exchange pipeline 5 , and the medium-pressure seawater exchange pipeline 8 are all two.

The two high-pressure concentrated seawater input pipelines 10 are distributed symmetrically to the center; the two medium-pressure concentrated seawater exchange pipelines 5 are distributed symmetrically to the center and are separated from the two high-pressure concentrated seawater input pipelines 10 by 90 degrees.

The two pressure-relief concentrated seawater output pipes 15 are centrally symmetrically distributed; the two medium-pressure seawater exchange pipes 8 are centrally symmetrically distributed and are 90° apart from the two pressure-relief concentrated seawater output pipes 15 .

When the exchange module body 2 rotates to the first phase, the two second-level pressure exchange chambers 4-2 are respectively connected to a high-pressure concentrated seawater input pipeline 10, and the two second-level pressure exchange chambers 13-2 are respectively connected to a pressure relief concentrated seawater output pipeline 15 and a low-pressure seawater input pipeline 14; at the same time, the two first-level pressure exchange chambers 4-1 are respectively connected to a medium-pressure concentrated seawater exchange pipeline 5 and a medium-pressure seawater exchange pipeline 8, and at the same time, the two first-level pressure exchange chambers 13-1 are respectively connected to a medium-pressure concentrated seawater exchange pipeline 5 and a medium-pressure seawater exchange pipeline 8.

When the exchange module body 2 rotates to the second phase, the two first-level pressure exchange chambers 4-1 are respectively connected to a high-pressure concentrated seawater input pipeline 10, and the two first-level pressure exchange chambers 13-1 are respectively connected to a pressure relief concentrated seawater output pipeline 15 and a low-pressure seawater input pipeline 14; at the same time, the two second-level pressure exchange chambers 4-2 are respectively connected to a medium-pressure concentrated seawater exchange pipeline 5 and a medium-pressure seawater exchange pipeline 8, and at the same time, the two second-level pressure exchange chambers 13-2 are respectively connected to a medium-pressure concentrated seawater exchange pipeline 5 and a medium-pressure seawater exchange pipeline 8.

It should be noted that, taking the example of four pressure exchange chamber groups distributed circumferentially, the exchange module body 2 has four phases, wherein the first phase is symmetrical with the third phase and the process is the same; the second phase is symmetrical with the fourth phase and the process is the same.

Furthermore, the primary pressure exchange chamber is preferably arranged above the secondary pressure exchange chamber to improve space utilization.

Furthermore, the output pressure limiting valve 16 - 2 is arranged at the inlet of the high-pressure seawater output pipeline 11 .

Furthermore, the exchange pressure limiting valve 16 - 1 is arranged at the inlet of the medium-pressure seawater exchange pipeline 8 .

Furthermore, the exchange module body 2 is connected to an external motor (not shown) and is driven to rotate by the external motor.

Further, as shown in FIG. 5 , in order to facilitate installation and arrangement, the primary elastic member 7 is preferably a compression spring.

A primary annular pad 9-1 is fixed at one end of the primary pressure exchange chamber, one end of the primary elastic member 7 is fixed in the primary annular pad 9-1, and the other end is fixed to one side of the piston 6 in the primary pressure exchange chamber, and the primary annular pad 9-1 can contact and abut against one side of the piston 6. The design of the primary annular pad 9-1 can prevent the primary elastic member 7 from being over-compressed, thereby ensuring its service life.

Further, as shown in FIG. 5 , in order to facilitate installation and arrangement, the secondary elastic member 12 is preferably a compression spring.

A secondary annular pad 9-2 is fixed at one end of the secondary pressure exchange chamber; one end of the secondary elastic member 12 is fixed in the secondary annular pad 9-2, and the other end is fixed to a side surface of the piston 6 in the secondary pressure exchange chamber; the secondary annular pad 9-2 can contact and abut against a side surface of the piston 6. Similarly, the design of the secondary annular pad 9-2 can prevent the secondary elastic member 12 from being over-compressed, thereby ensuring its service life.

The working principle of the pressure accumulator pressure energy recovery device of this application is as follows:

As shown in FIG5 , in the first phase, the second primary pressure exchange chamber 4-2 is filled with medium-pressure seawater, and high-pressure concentrated seawater enters the second primary pressure exchange chamber 4-2 through the high-pressure concentrated seawater input pipe 10, pushing the piston 6 and compressing the primary elastic member 7, so that the medium-pressure seawater is pressurized to high-pressure seawater, and is discharged through the high-pressure seawater output pipe 11 after reaching the pressure set by the output pressure limiting valve 16-2, and the high-pressure concentrated seawater is reduced to medium-pressure concentrated seawater after pressure exchange. The pressure exchange module completes the corresponding work during rotation, and its rotation speed can be controlled by adjusting the power of the external motor, so that when the high-pressure seawater is just completely discharged, the inlet of the second primary pressure exchange chamber 4-2 rotates to completely fit the outer wall of the device.

The second secondary pressure exchange chamber 13-2 is filled with decompressed concentrated seawater that has transmitted pressure twice. When the secondary elastic member 12 in the compressed state recovers its deformation, it pushes the piston 6 to push the decompressed concentrated seawater into the decompressed concentrated seawater output pipe 15 for discharge, and forms a negative pressure in the chamber to suck low-pressure seawater from the low-pressure seawater input pipe 14. When the low-pressure seawater just completely fills the second secondary pressure exchange chamber 13-2, the inlet of the second secondary pressure exchange chamber 13-2 rotates to completely fit with the external module body 1. The operations of the second primary pressure exchange chamber 4-2 and the second secondary pressure exchange chamber 13-2 are carried out simultaneously.

As shown in FIG6 , when the exchange module body 2 rotates 90° to the second phase, the first elastic member 7 in the compressed state in the first primary pressure exchange chamber 4-1 pushes the piston 6 when it recovers its deformation, so that the medium-pressure concentrated seawater in the first primary pressure exchange chamber 4-1 passes through the medium-pressure concentrated seawater exchange pipe 5 and enters the first and second pressure exchange chambers 13-1.

In the first and second pressure exchange chambers 13-1, the medium-pressure concentrated seawater pushes the piston 6 and compresses the second elastic member 12, so that the low-pressure seawater is pressurized into medium-pressure seawater. After reaching the pressure set by the exchange pressure limiting valve 16-1, it enters the first and second pressure exchange chambers 4-1 through the medium-pressure seawater exchange pipe 8. At this time, the medium-pressure concentrated seawater in the first and second pressure exchange chambers 13-1 is depressurized and becomes decompressed concentrated seawater.

At this point, the exchange of seawater in the pressure exchange chamber group is completed. When the exchange of seawater is just completed, the pressure exchange chamber group rotates until it is completely in contact with the outer wall of the device.

After working in the first and second phases, the pressure exchange chamber group completes a pressure energy recovery; in the subsequent work, the pressure exchange chamber group will reach the third phase after rotating 90°. After completing the corresponding work, the pressure exchange chamber group rotates 90° again on the basis of the third phase to reach the fourth phase. The work of the device in the third phase is exactly the same as that in the first phase, and the work in the fourth phase is exactly the same as that in the second phase. Through the continuous rotation of the pressure exchange module, the continuous recovery of residual pressure energy can be achieved.

The above is a detailed introduction to a pressure storage type pressure energy recovery device provided in the present application. For a person skilled in the art, according to the idea of the embodiments of the present application, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims (10)

1. A pressure accumulator type pressure energy recovery device, characterized in that it comprises an external pipeline module, a pressure exchange module and an internal pipeline module; The internal pipeline module is fixedly installed in the external pipeline module; The pressure exchange module is rotatably installed between the external pipeline module and the internal pipeline module; The external pipeline module comprises an external module body (1); The external module body (1) is provided with a high-pressure concentrated seawater input pipeline (10), a pressure-relieved concentrated seawater output pipeline (15) and a medium-pressure concentrated seawater exchange pipeline (5); The internal pipeline module comprises an internal module body (3); The internal module body (3) is provided with a low-pressure seawater input pipeline (14), a high-pressure seawater output pipeline (11) and a medium-pressure seawater exchange pipeline (8); The medium-pressure seawater exchange pipeline (8) is provided with an exchange pressure limiting valve (16-1); An output pressure limiting valve (16-2) is provided in the high-pressure seawater output pipeline (11); The pressure exchange module comprises an exchange module body (2); The exchange module body (2) is provided with a pressure exchange chamber group; The pressure exchange chamber group includes a primary pressure exchange chamber and a secondary pressure exchange chamber; A piston (6) is provided in each of the first pressure exchange chamber and the second pressure exchange chamber; The primary pressure exchange chamber is also provided with a primary elastic member (7) connected to the piston (6) located therein; The secondary pressure exchange chamber is also provided with a secondary elastic member (12) which is connected to the piston (6) and has an elastic force lower than that of the primary elastic member (7); The primary elastic member (7) is configured to be elastically deformable as the connected piston (6) moves; The secondary elastic member (12) is configured to be elastically deformable as the connected piston (6) moves; When the exchange module body (2) rotates to the first phase, the two ends of the primary pressure exchange chamber are respectively connected to the high-pressure concentrated seawater input pipeline (10) and the high-pressure seawater output pipeline (11), and the two ends of the secondary pressure exchange chamber are respectively connected to the pressure-relieved concentrated seawater output pipeline (15) and the low-pressure seawater input pipeline (14); When the exchange module body (2) rotates to the second phase, the two ends of the primary pressure exchange chamber are respectively connected to the medium-pressure concentrated seawater exchange pipeline (5) and one end of the medium-pressure seawater exchange pipeline (8), while the two ends of the secondary pressure exchange chamber are respectively connected to the other ends of the medium-pressure concentrated seawater exchange pipeline (5) and the medium-pressure seawater exchange pipeline (8). 2. A pressure accumulator type pressure energy recovery device according to claim 1, characterized in that the number of pairs of the pressure exchange chamber groups is 2n pairs; The number of the high-pressure concentrated seawater input pipeline (10), the pressure-relieved concentrated seawater output pipeline (15), the medium-pressure concentrated seawater exchange pipeline (5), and the medium-pressure seawater exchange pipeline (8) is 2n; Wherein, n≥1 and is an integer. 3. A pressure-accumulation type pressure energy recovery device according to claim 2, characterized in that 2n pairs of pressure exchange chamber groups are arranged circumferentially and/or longitudinally. 4. The accumulator-type pressure energy recovery device according to claim 2, characterized in that n is 1; There are four pressure exchange chamber groups, which are distributed around the internal module body (3) at intervals of 90°; The primary pressure exchange chamber of the pair of centrally symmetrical pressure exchange chamber groups forms a first primary pressure exchange chamber (4-1), and the secondary pressure exchange chamber forms a first secondary pressure exchange chamber (13-1); The first-level pressure exchange chambers of another pair of the pressure exchange chamber groups that are centrally symmetrical form a second first-level pressure exchange chamber (4-2), and the second-level pressure exchange chambers thereof form a second second-level pressure exchange chamber (13-2); The number of the high-pressure concentrated seawater input pipeline (10), the pressure-relieved concentrated seawater output pipeline (15), the medium-pressure concentrated seawater exchange pipeline (5), and the medium-pressure seawater exchange pipeline (8) are all two; The two high-pressure concentrated seawater input pipelines (10) are centrally symmetrically distributed; The two medium-pressure concentrated seawater exchange pipes (5) are centrally symmetrically distributed and are spaced 90 degrees apart from the two high-pressure concentrated seawater input pipes (10); The two pressure-relieved concentrated seawater output pipes (15) are centrally symmetrically distributed; The two medium-pressure seawater exchange pipes (8) are centrally symmetrically distributed and are 90° apart from the two pressure-relieved concentrated seawater output pipes (15); When the exchange module body (2) rotates to the first phase, the two second-level pressure exchange chambers (4-2) are respectively connected to one of the high-pressure concentrated seawater input pipelines (10), and the two second-level pressure exchange chambers (13-2) are respectively connected to one of the pressure-relieved concentrated seawater output pipelines (15) and one of the low-pressure seawater input pipelines (14); at the same time, the two first-level pressure exchange chambers (4-1) are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines (5) and one of the medium-pressure seawater exchange pipelines (8), and at the same time, the two first-level pressure exchange chambers (13-1) are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines (5) and one of the medium-pressure seawater exchange pipelines (8); When the exchange module body (2) rotates to the second phase, the two first-level pressure exchange chambers (4-1) are respectively connected to one of the high-pressure concentrated seawater input pipelines (10), and the two first-level pressure exchange chambers (13-1) are respectively connected to one of the pressure-relieved concentrated seawater output pipelines (15) and one of the low-pressure seawater input pipelines (14); at the same time, the two second-level pressure exchange chambers (4-2) are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines (5) and one of the medium-pressure seawater exchange pipelines (8), and at the same time, the two second-level pressure exchange chambers (13-2) are respectively connected to one of the medium-pressure concentrated seawater exchange pipelines (5) and one of the medium-pressure seawater exchange pipelines (8). 5. A pressure accumulator-type pressure energy recovery device according to claim 1, characterized in that the primary pressure exchange chamber is arranged above the secondary pressure exchange chamber. 6. The pressure accumulator type pressure energy recovery device according to claim 1, characterized in that the output pressure limiting valve (16-2) is arranged at the inlet of the high-pressure seawater output pipeline (11). 7. The pressure accumulator type pressure energy recovery device according to claim 1, characterized in that the exchange pressure limiting valve (16-1) is arranged at the inlet of the medium-pressure seawater exchange pipeline (8). 8. The pressure-accumulation type pressure energy recovery device according to claim 1, characterized in that the exchange module body (2) is connected to an external motor and is driven to rotate by the external motor. 9. The pressure accumulator type pressure energy recovery device according to claim 1, characterized in that the primary elastic member (7) is a compression spring; A primary annular gasket (9-1) is fixed at one end of the primary pressure exchange chamber; One end of the primary elastic member (7) is fixed in the primary annular gasket (9-1), and the other end is fixed to a side surface of the piston (6) in the primary pressure exchange chamber; The primary annular gasket (9-1) can contact and abut against a side surface of the piston (6). 10. The pressure accumulator type pressure energy recovery device according to claim 1, characterized in that the secondary elastic member (12) is a compression spring; A secondary annular gasket (9-2) is fixed at one end of the secondary pressure exchange chamber; One end of the secondary elastic member (12) is fixed in the secondary annular gasket (9-2), and the other end is fixed to a side surface of the piston (6) in the secondary pressure exchange chamber; The secondary annular gasket (9-2) can contact and abut against a side surface of the piston (6).