JP7206951B2 - heat storage system - Google Patents

Description

The present disclosure relates to heat storage systems.

Conventionally, a heat storage system is known that includes a heat source that generates heat, a heat accumulator that stores heat, and a piping member that allows a working fluid to flow between the heat source and the heat accumulator (for example, Patent Document 1 reference). Specifically, this Patent Document 1 discloses that an engine is used as the heat source of the heat storage system, and the engine coolant is used as the working fluid of the heat storage system.

Japanese Utility Model Laid-Open No. 61-52513

In the heat storage system as described above, part of the heat stored in the heat accumulator is conducted to the piping that connects the heat accumulator and the heat source, and is radiated from this piping to the outside air. Therefore, it is considered that heat can be stored in the heat accumulator for a long time if the amount of heat radiated from this pipe to the outside air can be reduced.

The present disclosure has been made in view of the above, and an object thereof is to provide a heat storage system capable of storing heat in a heat accumulator for a long period of time.

In order to achieve the above object, the heat storage system according to the present disclosure includes a heat source that generates heat, a heat accumulator that stores heat, and a piping member that allows a working fluid to flow between the heat source and the heat accumulator. and, the piping member includes a heat source side pipe having one end connected to the heat source, a heat accumulator side pipe having one end connected to the heat accumulator, and provided at the other end of the heat source side pipe. and a heat accumulator side joint provided at the other end of the heat accumulator side pipe, wherein the heat source side joint and the heat accumulator side joint are connected to the heat source side joint and the heat accumulator side joint and a disconnected state in which the heat source side joint and the heat accumulator side joint are separated, and the heat accumulator side pipe and the inner pipe It has a double tube structure with an outer tube positioned outside the inner tube .
A heat storage system according to the present disclosure includes a heat source that generates heat, a heat accumulator that stores heat, and a piping member that allows a working fluid to flow between the heat source and the heat accumulator. A joint actuator and a control device are provided, and the piping member includes a heat source side pipe having one end connected to the heat source, a heat accumulator side pipe having one end connected to the heat accumulator, and the heat source side pipe. A heat source side joint provided at the other end, and a heat accumulator side joint provided at the other end of the heat accumulator side pipe, wherein the heat source side joint and the heat accumulator side joint are connected to the heat source side joint and the heat accumulator side joint. The heat accumulator side joint is configured by a joint capable of switching between a connected state in which the heat accumulator side joint is connected and a disconnected state in which the heat source side joint and the heat accumulator side joint are separated. When starting to supply the heat stored in the heat source to the heat source, and when starting to store the heat generated by the heat source in the heat storage device, the joint actuator is controlled to control the heat source. When the side joint and the heat accumulator side joint are brought close to each other to be in the connected state, and the supply of the heat stored in the heat accumulator to the heat source is terminated, and the heat generated by the heat source is transferred to the heat accumulator. , the joint actuator is controlled to move the heat source side joint and the heat storage side joint away from each other to the separated state.
A heat storage system according to the present disclosure includes a heat source that generates heat, a heat accumulator that stores heat, and a piping member that allows a working fluid to flow between the heat source and the heat accumulator. A joint actuator, a closing member, a closing member actuator, and a control device, wherein the pipe member includes a heat source side pipe having one end connected to the heat source and a heat storage device having one end connected to the heat accumulator. a heat source side pipe, a heat source side joint provided at the other end of the heat source side pipe, and a heat accumulator side joint provided at the other end of the heat accumulator side pipe, the heat source side joint and the heat accumulator side The joint is a joint capable of switching between a connected state in which the heat source side joint and the heat accumulator side joint are connected and a disconnected state in which the heat source side joint and the heat accumulator side joint are separated. When starting to supply the heat stored in the heat accumulator to the heat source, and when starting to store heat generated by the heat source in the heat accumulator, the control device closes the block. After the member actuator is controlled to release the closing of the end surface by the closing member, the joint actuator is controlled to bring the heat source side joint and the heat accumulator side joint closer to each other to be in the connected state. When the supply of the heat stored in the heat accumulator to the heat source is finished, and when the heat storage of the heat generated by the heat source in the heat accumulator is finished, the joint actuator is controlled. After the heat source side joint and the heat storage side joint are separated from each other to be in the separated state, the closing member actuator is controlled to close the end surface with the closing member.

According to the present disclosure, heat can be stored in the heat accumulator for a long period of time.

1(a) and 1(b) are schematic configuration diagrams for explaining the configuration of a heat storage system according to Embodiment 1. FIG. 4 is an enlarged schematic diagram of a portion near the joint in the piping member according to Embodiment 1. FIG. FIG. 5 is a diagram for explaining experimental results of Embodiment 1; FIG. 8 is a schematic configuration diagram schematically showing a state in which the joint of the heat storage system according to Embodiment 2 is in a disconnected state; FIG. 10 is a schematic configuration diagram schematically showing a state in which the joints of the heat storage system according to Embodiment 2 are in a connected state;

(Embodiment 1)
A heat storage system 1 according to Embodiment 1 of the present disclosure will be described with reference to the drawings. FIGS. 1(a) and 1(b) are schematic configuration diagrams for explaining the configuration of a heat storage system 1 according to this embodiment. Specifically, FIG. 1(a) schematically shows a state in which a joint described later of the heat storage system 1 is in a disconnected state, and FIG. 1(b) shows a state in which the joint of the heat storage system 1 is in a connected state. The state is schematically shown. The heat storage system 1 according to the present embodiment is installed in vehicles such as passenger cars, trucks, and buses, for example. However, the application of the heat storage system 1 is not limited to vehicles as in the present embodiment, and the heat storage system 1 can be mounted on, for example, industrial machines, ships, aircraft, etc., and for example, in factories and the like. It can also be used by being fixed at a predetermined position.

A heat storage system 1 according to this embodiment includes a heat source 10 , a heat storage device 20 , a piping member 30 , an actuator 50 , a pump 60 and a control device 70 . The heat source 10 is a device that generates heat. Although the specific configuration of the heat source 10 is not particularly limited as long as it has such a function, an engine is used as an example of the heat source 10 in this embodiment. As this engine, various engines such as a diesel engine and a gasoline engine can be used. The operation of the engine as the heat source 10 is controlled by the controller 70 .

Inside the heat source 10, an internal flow path 11 is provided for circulating a working fluid (indicated by F in FIG. 1(b)). In this embodiment, a refrigerant (more specifically, a refrigerant that cools the engine) is used as a specific example of the working fluid. While the engine as the heat source 10 is running, the working fluid in the internal flow path 11 is warmed by the heat of this engine.

The heat storage device 20 is a device that stores heat. Specifically, the heat storage device 20 according to this embodiment includes a heat storage material 21 and an internal flow path 22 . The heat storage material 21 and the internal flow path 22 are arranged inside the heat storage device 20 . The heat storage material 21 is arranged inside the heat storage device 20 so as to cover the outer surface of the internal flow path 22 . A working fluid flows through the internal channel 22 .

The heat storage material 21 is a material capable of storing heat. Specifically, the heat storage material 21 according to the present embodiment is in a crystalline state when the temperature is lower than the melting point. On the other hand, when the heat storage material 21 melts at a temperature higher than its melting point, it becomes liquid. The heat storage material 21 absorbs heat (that is, stores heat) when melted, and releases heat (that is, releases the stored heat) when solidified. Utilizing such properties, the heat storage material 21 exchanges heat with the working fluid in the internal flow path 22, so that when it melts, it stores the heat of the working fluid in the internal flow path 22, and when it solidifies, it heats up until then. The stored heat is released to warm the working fluid.

A specific type of the heat storage material 21 is not particularly limited, and known heat storage materials such as sugar alcohol, sodium acetate trihydrate, and sodium sulfate decahydrate can be used. The material to be used as the heat storage material 21 may be appropriately determined according to the application of the heat storage system 1 and the like. In this embodiment, as a specific example of the heat storage material 21, a heat storage material containing sugar alcohol as a main component is used, and more specifically, threitol is used.

The piping member 30 is a piping member for circulating the working fluid between the heat source 10 and the heat accumulator 20 . The piping member 30 according to the present embodiment includes piping 31a, piping 31b, piping 31c, and piping 31d (these are collectively referred to as "piping"), joints 32a, joints 32b, joints 32c, and joints 32d (these are collectively referred to as "pipes"). (hereinafter referred to as a "joint").

One end of the pipe 31 a is connected to the fluid outlet of the internal flow path 11 of the heat source 10 . One end of the pipe 31 b is connected to the fluid inlet of the internal flow path 11 of the heat source 10 . One end of the pipe 31 c is connected to the fluid inlet of the internal flow path 22 of the heat accumulator 20 . One end of the pipe 31 d is connected to the fluid outlet of the internal flow path 22 of the heat accumulator 20 .

The piping 31a and the piping 31b are examples of members having a function as "heat source side piping having one end connected to the heat source 10". Further, the pipe 31c and the pipe 31d are an example of a member having a function as "a heat accumulator side pipe having one end connected to the heat accumulator 20".

It is preferable that the total lengths of the pipes 31c and 31d are as short as possible in that the amount of heat released from the pipes 31c and 31d can be suppressed. In this embodiment, as an example, the total length of the pipe 31c is set shorter than the total length of the pipe 31a, and the total length of the pipe 31d is set shorter than the total length of the pipe 31b.

The joint 32a is provided at the other end of the pipe 31a. The joint 32b is provided at the other end of the pipe 31b. A joint 32c is provided at the other end of the pipe 31c. The joint 32d is provided at the other end of the pipe 31d.

Note that the joint 32a and the joint 32b are examples of members having a function as "a heat source side joint provided at the other end of the heat source side pipe". The joint 32c and the joint 32d are examples of members having a function as "a heat accumulator-side joint provided at the other end of the heat accumulator-side pipe".

The joints 32a and 32c are in a "connected state" in which the joints 32a and 32c are connected as shown in FIG. 1(b), and in which the joints 32a and 32c are separated as shown in FIG. 1(a). It is composed of a joint that can switch between the "disconnected state" and the "disconnected state". Similarly, the joint 32b and the joint 32d are in a "connected state" in which the joint 32b and the joint 32d are connected as shown in FIG. It is composed of a joint that can switch between a disconnected “disconnected state” and a “disconnected state”.

Specifically, the joints 32a and 32c according to the present embodiment are configured as detachable joints. Similarly, the joints 32b and 32d according to this embodiment are also configured by detachable joints. More specifically, in the present embodiment, one-touch joints (generally called one-touch couplings, one-touch couplers, etc.) are used as these detachable joints. As such a one-touch joint, one that can be manually switched between a connected state and a disconnected state may be used, or one that is automatically connected by an actuator 50 driven by an instruction from the control device 70. A device capable of switching between the state and the disconnected state may be used.

In this embodiment, as a specific example of the joints 32a, 32b, 32c, and 32d, an actuator 50 driven by an instruction from the control device 70 can automatically switch between the connected state and the disconnected state. A type joint (this is sometimes called an auto-coupling or an auto-coupler in general) is used. A known technique can be applied to the configuration of such a joint itself, and the specific configuration thereof is not particularly limited. , is structured as follows.

First, the joints 32a and 32c according to the present embodiment are configured as automatic one-touch joints, one of which is a plug and the other is a socket. Similarly, the joints 32b and 32d according to this embodiment are also configured as automatic one-touch joints, one of which is a plug and the other is a socket. As an example, in this embodiment, the joint 32a and the joint 3
2b is a plug, and joints 32c and 32d are sockets.

By inserting the joint 32a (plug) into the joint 32c (socket), the joint 32a and the joint 32c are connected. At this time, the fittings of the joint 32c are automatically engaged with the joint 32a so that the joint 32a is not easily detached from the joint 32c. On the other hand, when the joint 32a and the joint 32c are to be separated, air is supplied from the actuator 50 to the joint 32c, so that the engagement of the fitting of the joint 32c with the joint 32a is released. be done. As a result, the joint 32a and the joint 32c are separable. Next, the joint 32a and the joint 32c are separated, so that the joint 32a and the joint 32c are in a separated state (become in a physically separated state).

Similarly, by inserting the joint 32b (plug) into the joint 32d (socket), the joint 32b and the joint 32d are connected. Moreover, at this time, the fitting fitting of the joint 32d is automatically engaged with the joint 32b so that the joint 32b is not easily detached from the joint 32d. On the other hand, when the joint 32b and the joint 32d are to be separated, air is first supplied from the actuator 50 to the joint 32d, so that the engagement of the fitting of the joint 32d with the joint 32a is released. be done. As a result, the joint 32b and the joint 32d are separable. Next, the joint 32b and the joint 32d are separated, so that the joint 32b and the joint 32d are in a separated state (become in a physically separated state). The joints 32a, 32b, 32c, and 32d according to this embodiment are configured as described above.

Here, it is preferable that the materials of the joints 32c and 32d, particularly the outer surfaces thereof, have the lowest possible thermal conductivity and the highest possible strength (for example, Vickers strength). Stainless steel (SUS material) or the like can be used as such a material. In fact, the material of at least the outer surfaces of the joints 32c and 32d according to this embodiment is stainless steel. Although this will be described later with reference to FIG. 2, heat insulating materials 34c and 34d are further arranged on the outer surfaces of the joints 32c and 32d according to the present embodiment. The illustration of 34d is omitted.

The actuator 50 is a joint actuator that brings the joints 32a and 32b and the joints 32c and 32d closer to each other to put them in a "connected state" and separates the joints 32a and 32b and the joints 32c and 32d from each other to put them in a "disconnected state". be. The operation of this actuator 50 is controlled by a control device 70 .

Specifically, the actuator 50 according to the present embodiment is a cylinder (hydraulic or a pneumatic cylinder) and a fluid supply device that releases the engagement between the joints 32a and 32b and the joints 32c and 32d by supplying fluid (air in this embodiment) to the joints.

When the actuator 50 connects the joint, the cylinder of the actuator 50 displaces the heat accumulator 20 toward the heat source 10 . As a result, the joints 32c and 32d connected to the heat accumulator 20 via the pipes 31c and 31d approach the joints 32a and 32b, and the joints 32c and 32d are connected to the joints 32a and 32b (that is, the joints are connected). state).

On the other hand, when the actuator 50 separates the joints, first, the fluid supply device of the actuator 50 supplies air to the joints 32c and 32d, thereby engaging the joints 32c and 32a and The engagement between the joint 32d and the joint 32b is released. The cylinder of actuator 50 then displaces regenerator 20 away from heat source 10 . As a result, the joints 32c and 32d connected to the heat accumulator 20 via the pipes 31c and 31d are separated from the joints 32a and 32b, and the joints 32c and 32d are separated from the joints 32a and 32b (that is, the joints are separated). state).

When switching between the connected state and the disconnected state of the joints, the actuator 50 moves the joints 32c and 32d themselves, for example, to the joint 32a instead of moving the heat accumulator 20 closer to or away from the heat source 10 as described above. , 32b may be moved toward or away from each other. Specifically, in this case, the pipes 31c and 31d are configured by expandable pipes. The actuator 50 is connected to the joints 32c and 32d instead of the heat accumulator 20, and the joints 32c and 32d can be moved closer to or away from the joints 32a and 32b. Alternatively, the actuator 50 may be connected to the joints 32a and 32b to bring the joints 32a and 32b closer to and away from the joints 32c and 32d (in this case, the pipes 31a and 31b may configured).

The pump 60 is a device (circulation device) for forcibly circulating the working fluid between the heat source 10 and the heat accumulator 20 . Specifically, the pump 60 according to this embodiment is arranged in the middle of the pipe 31a. A specific type of the pump 60 is not particularly limited, but in this embodiment, as a specific example of the pump 60, an electric pump that operates under the control of the control device 70 is used.

In addition, the arrangement|positioning location of the pump 60 is not limited to the piping 31a. For example, the pump 60 may be arranged at any one of the pipes 31b, 31c and 31d. Alternatively, the heat storage system 1 may be configured without the pump 60 . In this case, the working fluid circulates between the heat source 10 and the heat accumulator 20 by convection caused by the temperature difference. However, the case where the heat storage system 1 is provided with the pump 60 as in the present embodiment is preferable in that the working fluid can be effectively circulated as compared to the case where the pump 60 is not provided.

FIG. 2 is an enlarged schematic diagram schematically showing an enlarged portion near the joint in the piping member 30 according to the present embodiment. The piping member 30 according to the present embodiment further includes leakage prevention valves (leakage prevention valve 33a, leakage prevention valve 33b, leakage prevention valve 33c, and leakage prevention valve 33d) and heat insulating materials (heat insulating material 34c and heat insulating material 34d). I have.

The leak prevention valves 33a, 33b, 33c and 33d are arranged inside the joints 32a, 32b, 32c and 32d, respectively. The leak prevention valve 33a prevents the working fluid inside the pipe 31a from passing through the joint 32a and leaking to the outside of the joint 32a when the joint 32a and the joint 32c are switched from the connected state to the disconnected state. is. The leak prevention valve 33b prevents the working fluid inside the pipe 31b from passing through the joint 32b and leaking to the outside of the joint 32b when the joint 32b and the joint 32d are switched from the connected state to the disconnected state. is. The leakage prevention valve 33c prevents the working fluid inside the pipe 31c from passing through the joint 32c and leaking to the outside of the joint 32c when the joint 32a and the joint 32c are switched from the connected state to the disconnected state. is. The leakage prevention valve 33d prevents the working fluid inside the pipe 31d from passing through the joint 32d and leaking to the outside of the joint 32d when the joint 32b and the joint 32d are switched from the connected state to the disconnected state. is.

As the leakage prevention valves 33a, 33b, 33c, and 33d having the functions described above, for example, known leakage prevention valves as described in Japanese Utility Model Publication No. 01-3569 can be applied. Specifically, this known leak-proof valve includes a valve body and a biasing member (spring) that presses the valve body so that the valve body always closes the opening of the plug or socket. and a type of leakage prevention valve in which the opening hole is unoccluded by the valve body when the socket is in a connected state. Alternatively, as the leak prevention valves 33a, 33b, 33c, and 33d, it is possible to apply a technique used in a known "detachable joint with a non-leak function (auto coupling)". Therefore, further detailed description of the leakage prevention valves 33a, 33b, 33c, and 33d will be omitted.

The heat insulating material 34c is a member for blocking heat conduction between the joint 32c and the outside air. The heat insulating material 34d is a member for blocking heat conduction between the joint 32d and the outside air. Specifically, the heat insulating material 34c according to the present embodiment entirely covers the outer surface of the joint 32c except for the end surface 35c facing the joint 32a. The reason why the end surface 35c of the joint 32c is not covered with the heat insulating material 34c is to prevent the heat insulating material 34c from being sandwiched between the joints 32c and 32a when the joints 32c and 32a are connected. be. Similarly, the heat insulating material 34d according to the present embodiment entirely covers the outer surface of the joint 32d except for the end face 35d facing the joint 32b.

As the heat insulating material 34c and the heat insulating material 34d, any material having a higher heat insulating property than the material of the outer surfaces of the joints 32c and 32d (as described above, stainless steel in this embodiment) may be used. It is not particularly limited. Specific examples of the heat insulating materials 34c and 34d include glass fiber (glass wool, glass cloth, etc.), foam material (polystyrene, polyurethane, etc.), glass fiber or foam material wrapped in aluminum foil, Various heat insulating materials can be used, such as a vacuum heat insulating material obtained by vacuum-packing glass fibers, or a combination thereof.

In addition, the pipe 31c according to the present embodiment has a double-pipe structure including an inner pipe 36c as an "inner pipe" and an outer pipe 37c as an "outer pipe" disposed outside the inner pipe 36c. have. Similarly, the pipe 31d according to the present embodiment is a double pipe that includes an inner pipe 36d that is an "inner pipe" and an outer pipe 37d that is an "outer pipe" arranged outside the inner pipe 36d. have a structure.

Here, in this embodiment, the working fluid flows inside the inner pipes 36c and 36d, and in the region between the inner pipe 36c and the outer pipe 37c and the region between the inner pipe 36d and the outer pipe 37d do not circulate. In this embodiment, the area between the inner tube 36c and the outer tube 37c and the area between the inner tube 36d and the outer tube 37d are filled with air. However, it is not limited to this configuration, and the area between the inner tube 36c and the outer tube 37c and the area between the inner tube 36d and the outer tube 37d may be evacuated, for example.

Referring again to FIG. 1, the control device 70 is a microcontroller having a CPU (Central Processing Unit) 71 having a function as a processor and a storage section 72 storing various data, programs, etc. used for the operation of the CPU 71. It has a computer. Note that the storage unit 72 is specifically configured by a storage medium such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The control device 70 according to the present embodiment controls the operation of the engine as the heat source 10, and also controls the pump 60, the actuator 50, and the like, thereby integrally controlling the operation of the heat storage system 1. FIG.

Next, operation of the heat storage system 1 will be described. First, the control device 70 according to the present embodiment controls the heat storage device 20 to start to supply the heat stored in to the heat source 10 . The specific content of the heat supply start condition is not particularly limited, but in the present embodiment, as a specific example of the heat supply start condition, during warm-up operation of the heat source 10 (engine) (that is, When the temperature of the working fluid in the internal flow path 11 of the heat source 10 is lower than a predetermined temperature, the temperature of the working fluid in the internal flow path 11 of the heat source 10 is lower than the temperature of the heat storage material 21 of the heat storage device 20. The condition of low is used. In other words, the heat supply start condition according to the present embodiment is that the temperature of the heat storage material 21 of the heat storage device 20 is equal to or higher than the temperature of the working fluid in the internal flow path 11 of the heat source 10 during warm-up operation of the heat source 10. You can also call it a condition.

Specifically, in this case, the heat storage system 1 includes a temperature sensor (not shown) that detects the temperature of the working fluid in the internal flow path 11 . The control device 70 obtains the temperature of the working fluid by obtaining the detection value of the temperature sensor. The heat storage system 1 also includes a temperature sensor (not shown) that detects the temperature of the heat storage material 21 . The control device 70 acquires the temperature of the heat storage material 21 by acquiring the detection value of this temperature sensor. Then, when the temperature of the working fluid obtained in this way is lower than the preset temperature and lower than the temperature of the heat storage material 21, the control device 70 determines that the heat supply start condition is satisfied. Then, the heat stored in the heat accumulator 20 is started to be supplied to the heat source 10 .

When starting to supply the heat stored in the heat accumulator 20 to the heat source 10, the control device 70 controls the actuator 50 to connect the joints 32a and 32c and connect the joints 32b and 32d. Connect. This causes the joint to switch from the disconnected state to the connected state. Controller 70 then activates pump 60 . As a result, the heat storage system 1 is in the state shown in FIG. 1(b) described above. In this case, the working fluid (F) warmed by the heat stored in the heat accumulator 20 flows through the pipes 31 d and 31 b into the internal flow path 11 of the heat source 10 . As a result, the engine as the heat source 10 can be warmed, and the warm-up of the engine can be accelerated. After flowing through the internal flow path 11 , the working fluid flows through the pipes 31 a and 31 c and returns to the internal flow path 22 of the heat accumulator 20 .

On the other hand, while the heat stored in the heat accumulator 20 is being supplied to the heat source 10 , the control device 70 determines that the temperature of the working fluid in the internal flow path 11 of the heat source 10 is equal to or higher than the temperature of the heat storage material 21 of the heat accumulator 20 . , the supply of the heat stored in the heat accumulator 20 to the heat source 10 is terminated. Specifically, in this case, the control device 70 stops the pump 60, controls the actuator 50, disconnects the joints 32a and 32c, and disconnects the joints 32b and 32d. state. As a result, the heat storage system 1 is in the state shown in FIG. 1(a). After that, when the heat supply start condition is satisfied again, the control device 70 restarts the supply of the heat stored in the heat accumulator 20 to the heat source 10 .

In addition, when a predetermined heat storage start condition (a condition for starting storage of heat generated by the heat source 10 in the heat accumulator 20) is satisfied, the control device 70 stores the heat generated by the heat source 10 in the heat accumulator. Heat storage to 20 is started. The specific content of this heat storage start condition is not particularly limited, but in this embodiment, as a specific example of this heat storage start condition, the warm-up operation of the heat source 10 is completed (that is, the inside of the heat source 10 The condition is that the temperature of the working fluid in the flow path 11 has reached or exceeded a predetermined temperature.

Specifically, in this case, the control device 70 acquires the temperature of the working fluid by acquiring the detection value of the temperature sensor that detects the temperature of the working fluid in the internal flow path 11, as described above. Then, when it is determined that the temperature of the working fluid obtained in this manner has reached or exceeded a predetermined temperature, the control device 70 determines that the heat storage start condition is satisfied, and the heat source 10 generates Start storing heat in the heat accumulator 20 .

When starting to store the heat generated by the heat source 10 in the heat accumulator 20, the control device 70 controls the actuator 50 to connect the joints 32a and 32c and connect the joints 32b and 32d. state. This causes the joint to switch from the disconnected state to the connected state. Controller 70 then activates pump 60 . As a result, the heat storage system 1 is in the state shown in FIG. 1(b) described above. In this case, the working fluid (F) warmed by the heat generated by the heat source 10 flows through the pipes 31 a and 31 c into the internal flow path 22 of the heat accumulator 20 . The heat storage material 21 stores heat in the internal flow path 22 . After circulating through the internal flow path 22, the working fluid (the working fluid whose temperature has become low due to the loss of heat by the heat accumulator 20) flows through the pipes 31d and 31b and returns to the internal flow channel 11 of the heat source 10. .

On the other hand, while the heat generated by the heat source 10 is being stored in the heat accumulator 20, the control device 70 determines that the temperature of the working fluid in the internal flow path 11 of the heat source 10 has become lower than a predetermined temperature. In this case, the storage of the heat generated by the heat source 10 in the heat accumulator 20 is terminated. Specifically, in this case, the control device 70 stops the pump 60, controls the actuator 50, disconnects the joints 32a and 32c, and disconnects the joints 32b and 32d. state. As a result, the heat storage system 1 is in the state shown in FIG. 1(a). After that, when the temperature of the working fluid in the internal flow path 11 of the heat source 10 again reaches or exceeds the predetermined temperature, the control device 70 resumes storing the heat generated by the heat source 10 in the heat accumulator 20. Let

The conditions for starting the supply of the heat stored in the heat accumulator 20 to the heat source 10, the conditions for ending the supply of the heat stored in the heat accumulator 20 to the heat source 10, and the The conditions for starting the heat storage of the heat generated by the heat source 10 in the heat storage device 20 and the conditions for ending the heat storage of the heat generated by the heat source 10 in the heat storage device 20 are merely examples, and the contents described above are It is not limited. These conditions may be appropriately set according to the specific configuration of the heat source 10, the specific type of the heat storage material 21, the specific application of the heat storage system 1, and the like.

Next, the effects of this embodiment will be described. First, according to this embodiment, as described with reference to FIG. ) and joints 32c and 32d (joints on the heat storage device side), and the joints 32a and 32b and the joints 32c and 32d are configured by joints capable of switching between a connected state and a disconnected state. 20 can be separated (physically separated) in the middle. By disconnecting the joints 32a, 32b and the joints 32c, 32d, when the pipe connecting the heat source 10 and the heat accumulator 20 is disconnected at a midpoint, the heat source 10 and the heat accumulator 20 are connected. The length of the piping connected to the heat accumulator 20 can be shortened compared to the case where the piping connected to the heat accumulator 20 is not disconnected. As a result, it is possible to reduce the amount of heat released when the heat stored in the heat accumulator 20 is radiated from this pipe to the outside air. As a result, heat can be stored in the heat accumulator 20 for a long time. That is, the heat retention time in the heat accumulator 20 can be lengthened.

Further, according to the present embodiment, as described with reference to FIG. 2, since the leak prevention valves 33a, 33b, 33c, and 33d are arranged in the joints 32a, 32b, 32c, and 32d, the connection state is changed to the disconnection state. When switched, the working fluid inside the pipes 31a, 31b, 31c, and 31d can be prevented from leaking to the outside.

In addition, according to the present embodiment, since the pipes 31c and 31d have a double pipe structure, the pipes 31c and 31d are compared to the case where the pipes 31c and 31d do not have a double pipe structure. The amount of heat released from the pipe 31d to the outside air can be reduced.

In addition, according to the present embodiment, since the heat insulating materials 34c and 34d are arranged in the joints 32c and 32d, compared with the case where such heat insulating materials 34c and 34d are not arranged, the heat from the joints 32c and 32d is reduced. It is possible to reduce the amount of heat released to the outside air.

The effects of the present embodiment described above were confirmed by experiments. The results of this experiment are described below. FIG. 3 is a diagram for explaining experimental results of this embodiment. Specifically, the vertical axis in FIG. 3 indicates the temperature of the heat storage material 21, and the horizontal axis indicates the elapsed time. A line 100 in FIG. 3 is a line showing experimental results of the heat storage system 1 according to the present embodiment. Specifically, in the heat storage system 1 according to the present embodiment, the line 100 measures the result of measuring the temperature change of the heat storage material 21 from the time when the heat storage in the heat storage device 20 of the heat generated by the heat source 10 is completed. showing. More specifically, in the heat storage system 1 according to this embodiment, the line 100 stops the pump 60 and disconnects the joint in order to finish storing the heat generated by the heat source 10 in the heat storage device 20 . It shows the result of measuring the temperature change of the heat storage material 21 from the point of time when .

On the other hand, line 101 in FIG. 3 is a line showing experimental results of the heat storage system according to the comparative example. Here, as a heat storage system according to this comparative example, a heat storage system in which a heat source and a heat accumulator are always connected by a pipe was used. Specifically, the heat storage system according to this comparative example has the same hardware configuration as the heat storage system 1 according to the present embodiment, but the joint remains connected (however, the pump is stopped). That is, in the heat storage system according to the comparative example, the line 101 in FIG. The results of measuring the temperature change of the material are shown.

From FIG. 3, it can be seen that the line 100 has a higher temperature than the line 101 after the time a1. Therefore, it can be seen from the experimental results of FIG. 3 that the heat storage system 1 according to the present embodiment can store heat in the heat accumulator 20 for a long time.

By the way, although the heat storage system 1 according to the present embodiment described above includes all of the leakage prevention valve 33a, the leakage prevention valve 33b, the leakage prevention valve 33c, and the leakage prevention valve 33d, the configuration of the heat storage system 1 is limited to this. not something. The heat storage system 1 may comprise any leak-proof valve selected from the leak-proof valve 33a, the leak-proof valve 33b, the leak-proof valve 33c and the leak-proof valve 33d. Alternatively, the heat storage system 1 may be configured without the leakage prevention valve 33a, the leakage prevention valve 33b, the leakage prevention valve 33c, and the leakage prevention valve 33d.

Moreover, the heat storage system 1 described above can also be configured such that only one of the pipes 31c and 31d has a double pipe structure. Alternatively, the heat storage system 1 can be configured such that the pipes 31c and 31d do not have a double-pipe structure (in this case, the pipes 31c and 31d are composed of only inner pipes or only outer pipes). .

Moreover, the heat storage system 1 described above can also be configured to include only one of the heat insulating material 34c and the heat insulating material 34d. Alternatively, the heat storage system 1 may be configured without the heat insulating material 34c and the heat insulating material 34d.

(Embodiment 2)
Next, a heat storage system 1a according to Embodiment 2 of the present disclosure will be described. 4 and 5 are schematic configuration diagrams for explaining the configuration of the heat storage system 1a according to this embodiment. Specifically, FIG. 4 schematically shows how the joints of the heat storage system 1a are disconnected, and FIG. 5 schematically shows how the joints of the heat storage system 1a are connected. .

The heat storage system 1a according to the present embodiment is different from the heat storage system 1 according to the first embodiment in that it further includes a closing mechanism 40c and a closing mechanism 40d, and in that it includes a control device 70a instead of the control device 70. different. Other configurations of the heat storage system 1a are the same as those of the heat storage system 1 according to the first embodiment described above, so descriptions of other configurations are omitted.

The closure mechanism 40c comprises a closure member 41c and an actuator 42c (ie, an actuator for the closure member 41c). The closing member 41c is a member capable of closing the end face 35c of the joint 32c facing the joint 32a when the joint 32a and the joint 32c are in the separated state. In this embodiment, a flat shutter is used as a specific example of the closing member 41c.

Specifically, the closing member 41c according to the present embodiment includes a flat plate member (plate-shaped member) made of steel (carbon steel) or stainless steel, a heat insulating material having higher heat insulation than the material of the flat plate member, It is composed of an adiabatic shutter with More specifically, the heat insulating material according to this embodiment is arranged on the outer surface of the flat plate member.

Since the closing member 41c has a heat insulating material in this way, when the closing member 41c closes the end surface 35c of the joint 32c, the release of heat from the end surface 35c of the joint 32c can be effectively suppressed. As the heat insulating material for the closing member 41c, the same heat insulating material as the heat insulating materials 34c and 34d can be used.

However, the configuration of the closing member 41c is not limited to the above configuration as long as it can close the end surface 35c of the joint 32c. For example, the closing member 41c may be configured without the heat insulating material as described above. In addition, the closing member 41c is not a flat shutter as described above, but is closed from the outer periphery of the end surface 35c toward the center (that is, the end surface 35c is narrowed down) like a diaphragm mechanism of a camera. It is also possible to use a type of shutter (hereinafter referred to as an aperture shutter) that closes the end surface 35c by gradually closing the shutter.

The actuator 42c is a device that drives the closing member 41c. Specifically, the actuator 42c according to this embodiment includes a cylinder (hydraulic or pneumatic cylinder) that drives the closing member 41c in response to an instruction from the control device 70a. When the closing member 41c is driven by the actuator 42c, the closing member 41c closes the end surface 35c of the joint 32c as shown in FIG. 4, or unblocks the end surface 35c as shown in FIG. be able to.

The closing mechanism 40d has a configuration similar to that of the closing mechanism 40c described above. Specifically, the closure mechanism 40d includes a closure member 41d and an actuator 42d (ie, an actuator for the closure member 41d). The closing member 41d is a member capable of closing the end surface 35d of the joint 32d facing the joint 32b when the joint 32b and the joint 32d are in the disconnected state. In this embodiment, a flat shutter is used as a specific example of the closing member 41d. Specifically, the closing member 41d according to the present embodiment is composed of a heat insulating shutter having a flat plate member made of steel (carbon steel) or stainless steel and a heat insulating material having a higher heat insulating property than the material of the flat plate member. It is Thereby, when the closing member 41d closes the end surface 35d of the joint 32d, heat release from the end surface 35d of the joint 32d can be effectively suppressed. As the heat insulating material for the closing member 41d, the same heat insulating material as the heat insulating materials 34c and 34d can be used.

However, the configuration of the closing member 41d is not limited to the above configuration as long as it can close the end face 35d of the joint 32d. For example, the closing member 41d may be configured without the heat insulating material as described above. In addition, the closing member 41d is not a flat shutter as described above, but a diaphragm of a type that closes the end face 35d by closing from the outer periphery toward the center of the end face 35d, like a diaphragm mechanism of a camera, for example. A shutter can also be used.

The actuator 42d is a device that drives the closing member 41d. Specifically, the actuator 42c according to this embodiment includes a cylinder (hydraulic or pneumatic cylinder) that drives the closing member 41d in response to an instruction from the control device 70a. When the closing member 41d is driven by the actuator 42d, the closing member 41d closes the end surface 35d of the joint 32d as shown in FIG. 4, or unblocks the end surface 35d as shown in FIG. be able to.

The control device 70a according to the present embodiment differs from the control device 70 according to the first embodiment in that it further controls the actuator 42c and the actuator 42d. Specifically, when the control device 70a starts to supply the heat stored in the heat accumulator 20 to the heat source 10, and when it starts to store the heat generated by the heat source 10 in the heat accumulator 20, , the actuators 42c and 42d are controlled to release the blockage of the end surfaces 35c and 35d by the blocking members 41c and 41d.

Further, when the control device 70a terminates the supply of the heat stored in the heat accumulator 20 to the heat source 10, and when terminating the heat storage of the heat generated by the heat source 10 in the heat accumulator 20, the pump 60 is stopped and the actuator 50 is controlled to bring the joint into the disconnected state, the actuators 42c and 42d are controlled to close the end surfaces 35c and 35d by the closing members 41c and 41d. As a result, when the joint switches from the connected state to the disconnected state, the end surfaces 35c and 35d of the joints 32c and 32d can be closed by the closing members 41c and 41d as shown in FIG.

According to this embodiment as described above, in addition to the effects of the first embodiment described above, the following effects can be obtained. That is, according to this embodiment, as described above, when the joint is switched from the connected state to the disconnected state, the closing members 41c and 41d can close the end surfaces 35c and 35d of the joints 32c and 32d. It is possible to effectively suppress the release of heat to the outside from the end faces 35c, 35d of the joints 32c, 32d. As a result, heat can be stored in the heat accumulator 20 for a longer period of time.

In this embodiment, the heat storage system 1a includes both the closing mechanism 40c and the closing mechanism 40d, but is not limited to this configuration. The heat storage system 1a may include only one of the closing mechanism 40c and the closing mechanism 40d.

Although the embodiments according to the present disclosure have been described above, the present disclosure is not limited to such specific embodiments, and various further modifications and changes are possible within the scope of the claims. .

1, 1a heat storage system 10 heat source 20 heat storage device 21 heat storage material 30 piping members 31a, 31b piping (heat source side piping)
31c, 31d piping (heat storage side piping)
32a, 32b joint (heat source side joint)
32c, 32d joints (heat accumulator side joints)
33a, 33b, 33c, 33d Leak prevention valves 34c, 34d Heat insulating materials 36c, 36d Inner pipes 37c, 37d Outer pipes 41c, 41d Closing members 42c, 42d Actuators (actuators for closing members)
50 actuator (actuator for joint)
60 pumps 70, 70a control device

Claims (8)

A heat storage system comprising a heat source that generates heat, a heat accumulator that stores heat, and a piping member that allows a working fluid to flow between the heat source and the heat accumulator,
The piping member comprises: a heat source side pipe having one end connected to the heat source; a heat accumulator side pipe having one end connected to the heat accumulator; a heat source side joint provided at the other end of the heat source side pipe; a heat accumulator-side joint provided at the other end of the heat accumulator-side pipe,
The heat source side joint and the heat accumulator side joint have a connected state in which the heat source side joint and the heat accumulator side joint are connected, and a disconnected state in which the heat source side joint and the heat accumulator side joint are separated. It is composed of a joint that can switch between
The heat storage system, wherein the regenerator-side piping has a double-tube structure comprising an inner tube and an outer tube arranged outside the inner tube . A heat storage system comprising a heat source that generates heat, a heat accumulator that stores heat, and a piping member that allows a working fluid to flow between the heat source and the heat accumulator,
a joint actuator and a control device,
The piping member comprises: a heat source side pipe having one end connected to the heat source; a heat accumulator side pipe having one end connected to the heat accumulator; a heat source side joint provided at the other end of the heat source side pipe; a heat accumulator-side joint provided at the other end of the heat accumulator-side pipe,
The heat source side joint and the heat accumulator side joint have a connected state in which the heat source side joint and the heat accumulator side joint are connected, and a disconnected state in which the heat source side joint and the heat accumulator side joint are separated. It is composed of a joint that can switch between
When starting to supply the heat stored in the heat accumulator to the heat source, and when starting to store heat generated by the heat source in the heat accumulator, the control device controls the joint actuator. is controlled so that the heat source side joint and the heat accumulator side joint are brought closer to each other to be in the connected state, and the supply of the heat stored in the heat accumulator to the heat source is terminated, and the heat source generates The heat storage system controls the joint actuator to move the heat source side joint and the heat storage side joint away from each other to be in the separated state when the heat storage in the heat accumulator is finished . 3. The heat storage system according to claim 2 , wherein the regenerator-side piping has a double-tube structure comprising an inner tube and an outer tube arranged outside the inner tube. In the heat source side joint, when the heat source side joint and the heat accumulator side joint are switched from the connected state to the disconnected state, the working fluid inside the heat source side pipe passes through the heat source side joint. The heat storage system according to any one of claims 1 to 3, further comprising a leakage prevention valve for preventing leakage to the outside of the heat source side joint. In the heat accumulator side joint, when the heat source side joint and the heat accumulator side joint are switched from the connected state to the disconnected state, the working fluid inside the heat accumulator side pipe moves the heat accumulator side joint. 5. The heat storage system according to any one of claims 1 to 4, further comprising a leakage prevention valve for preventing leakage to the outside of the heat accumulator side joint. 6. The heat storage system according to any one of claims 1 to 5 , wherein a heat insulating material is disposed in the heat accumulator side joint to block heat conduction between the heat accumulator side joint and the outside air. 7. A closing member for closing an end surface of the heat accumulator side joint facing the heat source side joint when the heat source side joint and the heat accumulator side joint are in the separated state. 2. The heat storage system according to item 1. A heat storage system comprising a heat source that generates heat, a heat accumulator that stores heat, and a piping member that allows a working fluid to flow between the heat source and the heat accumulator,
a joint actuator, a closure member, a closure member actuator, and a control device;
The piping member comprises: a heat source side pipe having one end connected to the heat source; a heat accumulator side pipe having one end connected to the heat accumulator; a heat source side joint provided at the other end of the heat source side pipe; a heat accumulator-side joint provided at the other end of the heat accumulator-side pipe,
The heat source side joint and the heat accumulator side joint have a connected state in which the heat source side joint and the heat accumulator side joint are connected, and a disconnected state in which the heat source side joint and the heat accumulator side joint are separated. It is composed of a joint that can switch between
When the control device starts to supply the heat accumulated in the heat accumulator to the heat source, and when the heat generated by the heat source starts to be accumulated in the heat accumulator, the closing member After controlling the actuator to release the blockage of the end surface by the blocking member, the joint actuator is controlled to bring the heat source side joint and the heat accumulator side joint closer to each other to be in the connected state, and When terminating the supply of the heat stored in the heat accumulator to the heat source, and when terminating the heat storage of the heat generated by the heat source in the heat accumulator, the joint actuator is controlled to The heat storage system, wherein after the heat source side joint and the heat storage side joint are separated from each other to be in the separated state, the closing member actuator is controlled to close the end face with the closing member .

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