JP2020193782A - Thermomagnetic cycle device - Google Patents

Abstract

To provide a thermomagnetic cycle device with accelerated activation.SOLUTION: In a demagnetization period DEMG, a suppression period REPR in which a flow rate FR of a medium is suppressed is provided. The suppression period REPR is provided in a reduction period MG- where a magnetic field MG decreases. In the reduction period, a magnetic calorific value effect element exerts an endothermic effect. In the suppression period, heat exchange between the magnetic heat quantity effect element and the medium is suppressed. As a result, the endothermic action decreases the temperature of the magnetic calorie effect element. By this operation, cold storage operation is executed. The cold storage operation accelerates the temperature decrease of the magnetic heat quantity effect element.SELECTED DRAWING: Figure 3

Description

The disclosure herein relates to a thermomagnetic cycle device.

Patent Document 1 discloses a thermomagnetic cycle device. In Patent Document 1, start-up from the initial temperature is promoted. The contents of the prior art document are incorporated by reference as an explanation of the technical elements in this specification.

JP-A-2016-109412

Patent Document 1 promotes activation by adjusting the reciprocating flow length. Further improvements are required of thermomagnetic cycle devices in the above-mentioned viewpoints or in other viewpoints not mentioned.

One object disclosed is to provide a thermomagnetic cycle device with accelerated activation.

The thermomagnetic cycle device disclosed herein is arranged between a high temperature end (HT) and a low temperature end (LT), and exhibits a magnetic heat effect element (7), a magnetic heat effect element, and heat. A magnetic field modulator (11) that periodically modulates the strength of the external magnetic field so as to alternately repeat the exchange medium (8), the excitation period for applying an external magnetic field to the magnetic heat effect element, and the demagnetization period for removing the external magnetic field. ) And the heat transport device (21) that reciprocally generates the relative movement between the magnetic heat effect element and the medium, and the magnetic field modulator and / or the heat transport device is the magnetic heat effect element during the excitation period. The first heat exchange amount with the medium and the second heat exchange amount between the magnetic heat quantity effect element and the medium during the demagnetization period are set to be different.

According to the disclosed thermomagnetic cycle apparatus, the first heat exchange amount between the magnetic heat effect element and the medium during the excitation period and the second heat exchange amount between the magnetic heat effect element and the medium during the demagnetization period are different. The difference between the first heat exchange amount and the second heat exchange amount changes the temperature of the magnetic heat exchange amount effect element. Therefore, the temperature change of the magnetic heat quantity effect element is promoted. The promotion of the temperature change of the magnetic heat quantity effect element contributes to shortening the start-up time from the start-up of the thermomagnetic cycle device to the acquisition of the planned heat output.

In one embodiment, the first heat exchange amount is larger than the second heat exchange amount (Q1> Q2). A cold storage operation is provided when the temperature of the magnetic heat effect element drops due to the magnetic heat effect during the degaussing period. The cold storage operation promotes a decrease in the temperature of the magnetic heat quantity effect element.

In one embodiment, the first heat exchange amount is smaller than the second heat exchange amount (Q1 <Q2). A heat storage operation is provided when the temperature of the magnetic heat effect element rises due to the magnetic heat effect during the excitation period. The heat storage operation promotes an increase in the temperature of the magnetic heat quantity effect element.

The disclosed aspects of this specification employ different technical means to achieve their respective objectives. The claims and the reference numerals in parentheses described in this section exemplify the correspondence with the parts of the embodiments described later, and are not intended to limit the technical scope. The objectives, features, and effects disclosed herein will be made clearer by reference to the subsequent detailed description and accompanying drawings.

It is a block diagram of the air conditioner which concerns on 1st Embodiment. It is a top view of the cam which shows a plurality of tracks. It is a waveform diagram which shows the change between the flow of a heat medium and a magnetic field. It is a graph which shows the temperature distribution of the MHP apparatus. It is a graph which shows the temperature distribution of the MHP apparatus. It is a flowchart which shows the control process. It is a block diagram of the thermal equipment which concerns on 2nd Embodiment. It is a waveform diagram which shows the change between the flow of a heat medium and a magnetic field. It is a block diagram of the thermal apparatus which concerns on 3rd Embodiment. It is a waveform diagram which shows the change between the flow of a heat medium and a magnetic field. It is a block diagram of the thermal equipment which concerns on 4th Embodiment. It is a flowchart which shows the control process. It is a waveform figure which shows the temperature change of the MHP apparatus. It is a block diagram of the thermal apparatus which concerns on 5th Embodiment. It is a block diagram of the thermal apparatus which concerns on 6th Embodiment. It is a block diagram of the thermal apparatus which concerns on 7th Embodiment. It is a flowchart which shows the control process. It is a waveform figure which shows the temperature change of the MHP apparatus. It is a flowchart of the heat equipment which concerns on 8th Embodiment. It is a block diagram which shows the MHP apparatus of 9th Embodiment. It is sectional drawing in the XXI-XXI line of FIG. It is a waveform diagram which shows the strength of a magnetic field and the angle of rotation.

A plurality of embodiments will be described with reference to the drawings. In a plurality of embodiments, functionally and / or structurally corresponding parts and / or associated parts may be designated with the same reference code or reference codes having a hundreds or more different digits. References can be made to the description of other embodiments for the corresponding and / or associated parts.

First Embodiment FIG. 1 shows an air conditioner 1 according to the first embodiment. The air conditioner 1 is one of the thermal devices. The air conditioner 1 includes a magnetic heat effect type heat pump device 2 (MHP: Magneto-caloric effect Heat Pump). The MHP device 2 provides a thermomagnetic cycle device.

In this specification, the term heat pump device is used in a broad sense. That is, the term heat pump device includes both a device that utilizes the cold heat obtained by the heat pump device and a device that utilizes the heat obtained by the heat pump device. Devices that utilize cold heat are sometimes also called refrigeration cycle devices. Therefore, the term heat pump device is used herein as a concept that includes a refrigeration cycle device.

The MHP device 2 is configured to generate a temperature difference between the high temperature end HT and the low temperature end LT. The air conditioner 1 has a high temperature heat exchanger 3 and a low temperature heat exchanger 4. The high temperature heat exchanger 3 is provided at the high temperature end HT. The low temperature heat exchanger 4 is provided at the low temperature end LT. The air conditioner 1 includes a device for extracting a thermal output from the MHP device 2. One of the output devices is provided by a high temperature heat exchanger 3 that utilizes the high temperature obtained at the high temperature end HT of the MHP device 2. The high temperature heat exchanger 3 provides heat exchange between the high temperature end HT and a medium such as air. The high temperature heat exchanger 3 is mainly used for heat dissipation. The high-temperature heat exchanger 3 is installed in, for example, the interior of a vehicle, and heats the air by exchanging heat with air for air conditioning. The high temperature heat exchanger 3 is one of the components of the high temperature system. One of the output devices is provided by a low temperature heat exchanger 4 that utilizes the low temperature obtained at the low temperature end LT of the MHP device 2. The cold heat exchanger 4 provides heat exchange between the cold end LT and a medium, such as air. The low temperature heat exchanger 4 is mainly used for heat absorption. The low temperature heat exchanger 4 is installed outside the vehicle, for example, and exchanges heat with the outside air. The low temperature heat exchanger 4 is one of the components of the low temperature system.

The MHP device 2 has a power source 5 for driving the MHP device 2. The MHP device 2 is rotationally driven by, for example, the power source 5. The power source 5 is the only power source 5 of the MHP device 2. The power source 5 is provided by a rotating device such as an electric motor or an internal combustion engine. An example of the power source 5 is an electric motor driven by a battery mounted on a vehicle.

The MHP device 2 includes a housing 6. The housing 6 partitions a working room through which a medium for heat transport can flow. One working room extends along the axial direction of the housing 6. One working room is open at both axial end faces of the housing 6.

The MHP device 2 includes a magnetic heat quantity effect element (MCE: Magneto-Caloric Effect) 7. The MCE element 7 is arranged between the high temperature end HT and the low temperature end LT. The MCE element 7 exerts a magnetic heat quantity effect. The MCE element 7 is fixedly supported in the housing 6. The MCE element 7 is positioned in the work room. The MCE element 7 extends elongated along the axial direction of the housing 6.

The MHP device 2 utilizes the magnetic heat effect of the MCE element 7. The MHP device 2 generates a high temperature end HT and a low temperature end LT by the MCE element 7. The MCE element 7 is provided between the high temperature end HT and the low temperature end LT.

The MCE element 7 generates heat and endothermic in response to a change in the strength of the external magnetic field. The MCE element 7 generates heat when an external magnetic field is applied, and absorbs heat when the external magnetic field is removed. When the electron spins of the MCE element 7 are aligned in the magnetic field direction by applying an external magnetic field, the magnetic entropy decreases and the temperature of the MCE element 7 rises by releasing heat. Further, when the electron spin of the MCE element 7 becomes disordered due to the removal of the external magnetic field, the magnetic entropy increases and the temperature of the MCE element 7 decreases by absorbing heat. The MCE element 7 is made of a magnetic material that exhibits a high magnetic heat effect in the normal temperature range. For example, a gadolinium-based material or a lanthanum-iron-silicon compound can be used. In addition, a mixture of manganese, iron, phosphorus and germanium can be used. As the MCE element 7, an element that absorbs heat by applying an external magnetic field and generates heat by removing the external magnetic field may be used.

The MCE element 7 has a plurality of partial elements connected in series. The MCE element 7 is cascade-connected and is also called a cascade connection element. The plurality of partial elements exert a magnetic heat quantity effect with high efficiency in different temperature zones. The plurality of partial elements are arranged so as to share the temperature difference between the high temperature end HT and the low temperature end LT.

The MCE element 7 is arranged so as to exchange heat with the medium 8 responsible for heat transport. In other words, the medium 8 exchanges heat with the MCE element 7. The medium 8 fills the working room. The medium 8 provides a heat storage element that stores heat and transports heat. The MCE element 7 is arranged long along the flow direction of the medium 8. The medium 8 is called a primary medium. The primary medium can be provided by a fluid such as antifreeze, water, oil. The housing 6 and the MCE element 7 provide an element bed.

The MHP device 2 includes a magnetic field modulation device 11 (MGMD) and a heat transport device 21 (THMD) for making the MCE element 7 function as an element of an AMR (Active Magnetic Refrigeration) cycle. The magnetic field modulator 11 includes a magnetic force source. The magnetic force source can be provided by a permanent magnet, or an electromagnet, or a combination of a permanent magnet and an electromagnet.

The magnetic field modulator 11 gives the MCE element 7 a magnetic field that fluctuates periodically. The MCE element 7 is arranged in a magnetic field and exerts a magnetic heat quantity effect. The magnetic field modulator 11 applies an external magnetic field to the MCE element 7 and increases or decreases the strength of the external magnetic field. The magnetic field modulator 11 periodically switches between an exciting state in which the MCE element 7 is placed in a strong magnetic field and a degaussing state in which the MCE element 7 is placed in a weak magnetic field or a zero magnetic field. The magnetic field modulator 11 includes a movable mechanism that periodically changes the distance between the MCE element 7 and the magnetic force source. The movable mechanism moves either the MCE element 7 or the magnetic force source with respect to the other. The magnetic field modulator 11 periodically modulates the strength of the external magnetic field so that the excitation period MGPR that applies an external magnetic field to the MCE element 7 and the degaussing period DEMG that removes the external magnetic field are alternately repeated.

In FIG. 3, the waveform MG shows a magnetic field. The magnetic field modulator 11 modulates the external magnetic field so as to periodically repeat the excitation period MGPR and the degaussing period DEMG. The excitation period MGPR is the period during which the MCE element 7 is placed in a strong external magnetic field. The excitation period MGPR includes an increasing period MG + in which the strength of the magnetic field increases. The increase period MG + starts at time t1 and ends at time t2. The excitation period MGPR includes a saturation period in which the magnetic field is saturated in a strong state. The degaussing period DEMG is a period in which the MCE element 7 is placed in an external magnetic field weaker than the excitation period. The degaussing period DEMG includes a decreasing period MG- in which the strength of the magnetic field decreases. The reduction period MG- begins at time t3 and ends at time t4. The degaussing period DEMG includes a saturation period in which the magnetic field is saturated in a weak state. In this embodiment, the excitation period MGPR and the degaussing period DEMG are equal. The increase period MG + and the decrease period MG- are equal. Instead, there may be a difference between the excitation period MGPR and the degaussing period DEMG. There may be a difference between the increasing period MG + and the decreasing period MG-.

Returning to FIG. 1, the heat transport device 21 reciprocally generates a relative movement between the MCE element 7 and the medium 8. The heat transport device 21 is a device that reciprocally flows a medium 8 that exchanges heat with the MCE element 7 along the MCE element 7. The heat transport device 21 reciprocates the medium 8 in synchronization with the fluctuation of the magnetic field. The heat transport device 21 moves the medium 8 in the axial direction (horizontal direction in the drawing) in synchronization with heat generation and endothermic heat due to the magnetic heat quantity effect of the MCE element 7. The heat transport device 21 causes a relative reciprocating movement between the MCE element 7 and the medium 8. In this embodiment, the reciprocating movement is realized by the reciprocating flow of the medium 8. The medium flowing through the high temperature heat exchanger 3 and the low temperature heat exchanger 4 is the medium 8. The medium flowing through the high temperature heat exchanger 3 and the low temperature heat exchanger 4 may be a secondary medium that exchanges heat with the medium 8.

The heat transport device 21 includes a pump 31 that pumps the medium 8. The heat transport device 21 includes a positive displacement pump 31 that provides reciprocating flow. The illustrated pump 31 produces a reciprocating flow of the medium 8 by a plurality of complementaryly driven pistons. The heat transport device 21 includes a link mechanism 32 and a cam mechanism 33 for driving a plurality of pistons. The cam mechanism 33 provides a converter that converts the rotational force supplied from the power source 5 into reciprocating motion. The link mechanism 32 transmits the reciprocating motion supplied from the cam mechanism 33 to the plurality of pistons. The cam mechanism 33 has a cam follower 41 and a cam rotor 42. The cam follower 41 moves along the cam profile 43 formed on the cam rotor 42. The cam profile 43 includes a plurality of tracks. The cam follower 41 is configured to select a plurality of tracks. In other words, the cam follower 41 is configured so that a plurality of tracks can be switched.

In FIG. 2, two tracks 44, 45 in the cam profile 43 are shown. The two tracks 44, 45 are formed concentrically. The cam follower 41 can select the track 44 or the track 45. The track 44 generates a first cam stroke waveform in which the ascending stroke and the descending stroke are symmetrical. The track 45 generates a second cam stroke waveform in which the ascending stroke and the descending stroke are asymmetrical. The first cam stroke waveform and the second cam stroke waveform generate different flow waveforms of the medium 8. In other words, the second flow waveform generated by the second cam stroke waveform is different from the first flow waveform generated by the first cam stroke waveform. The first flow waveform and the second flow waveform cause the MCE element 7 to store heat or cool. The heat storage amount or cold storage amount given to the MCE element 7 by the second flow waveform is larger than the heat storage amount or cold storage amount given to the MCE element 7 by the first flow waveform. The MHP device 2 utilizes this difference in the amount of heat storage or the amount of cold storage to promote startup, that is, to shorten the startup time.

Returning to FIG. 1, the heat transport device 21 includes a switch (SW) 34 that controls the position of the cam follower 41 so as to select the track 44 or the track 45. The switch 34 can be provided by an electric motor and a servomotor.

The MHP device 2 includes a control device (CTR) 35. The control device 35 controls at least the power source 5. The control device 35 controls the rotation speed by the power source 5. The control device 35 controls the switch 34. In addition, the control device 35 controls the function as the air conditioner 1. The control device 35 controls, for example, the amount of air blown to the high temperature heat exchanger 3 and / or the low temperature heat exchanger 4.

The control device 35 is an electronic control unit (Electronic Control Unit). The control device 35 provides a control system for the thermomagnetic cycle device. The control system has at least one arithmetic processing unit (CPU) and at least one memory device as a storage medium for storing programs and data. The control system is provided by a microcomputer with a computer-readable storage medium. A storage medium is a non-transitional substantive storage medium that stores a computer-readable program non-temporarily. The storage medium may be provided by a semiconductor memory, a magnetic disk, or the like. The control system may be provided by a single computer, or a set of computer resources linked by a data communication device. By being executed by the control system, the program causes the control system to function as a device described herein and to perform the methods described herein.

The means and / or functions provided by the control system can be provided by the software recorded in the substantive memory device and the computer, software only, hardware only, or a combination thereof that executes the software. For example, the control system can be provided by a logic called if-then-else form, or a neural network tuned by machine learning. Alternatively, for example, if the control system is provided by electronic circuits that are hardware, it can be provided by digital or analog circuits that include multiple logic circuits.

The control device in this specification may also be referred to as an electronic control device (ECU: Electronic Control Unit). The control device or control system is provided by (a) an algorithm as multiple logics called if-then-else form, or (b) a trained model tuned by machine learning, for example, an algorithm as a neural network. ..

The control device is provided by a control system that includes at least one computer. The control system may include multiple computers linked by data communication equipment. A computer includes at least one processor (hardware processor) which is hardware. The hardware processor can be provided by (i), (ii), or (iii) below.

(I) The hardware processor may be at least one processor core that executes a program stored in at least one memory. In this case, the computer is provided by at least one memory and at least one processor core. The processor core is called a CPU: Central Processing Unit, a GPU: Graphics Processing Unit, RISC-CPU, or the like. Memory is also called a storage medium. Memory is a non-transitional and substantive storage medium that non-temporarily stores "programs and / or data" that can be read by a processor. The storage medium is provided by a semiconductor memory, a magnetic disk, an optical disk, or the like. The program may be distributed by itself or as a storage medium in which the program is stored.

(Ii) The hardware processor may be a hardware logic circuit. In this case, the computer is provided by a digital circuit that includes a large number of programmed logic units (gate circuits). The digital circuit is a logic circuit array, for example, ASIC: Application-Specific Integrated Circuit, FPGA: Field Programmable Gate Array, SoC: System on a Chip, PGA: Programmable Cable. Digital circuits may include memory for storing programs and / or data. Computers may be provided by analog circuits. Computers may be provided by a combination of digital and analog circuits.

(Iii) The hardware processor may be a combination of the above (i) and the above (ii). (I) and (ii) are arranged on different chips or on a common chip. In these cases, the part (ii) is also called an accelerator.

Control devices, signal sources, and controlled objects provide various elements. At least some of those elements can be called blocks, modules, or sections. Moreover, the elements contained in the control system are called functional means only when intentionally.

The controls and methods thereof described in this disclosure are realized by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. May be done. Alternatively, the controls and methods thereof described in this disclosure may be implemented by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits. Alternatively, the controls and techniques described in this disclosure include a processor and memory programmed to perform one or more functions and a processor composed of one or more hardware logic circuits. It may be realized by one or more dedicated computers configured by a combination. Further, the computer program may be stored in a computer-readable non-transitional tangible recording medium as an instruction executed by the computer.

In FIG. 3, a waveform diagram showing the operation of a plurality of parts of the MHP device 2 is shown. The cam profile 43 defines the stroke ST of the cam follower 41. The track 44 provides the stroke ST44 of the cam follower 41. The track 45 provides the stroke ST45 of the cam follower 41. The stroke ST is transmitted to the pump 31 by the link mechanism 32. The pump 31 provides a reciprocating flow of the medium 8. The stroke ST defines the flow rate FR.

The stroke ST44 produces the flow rate waveform FR44 shown by the dashed line. The flow rate waveform FR44 causes the medium 8 to flow in one direction during the excitation period MGPR, and the medium 8 to flow in the other direction during the degaussing period DEMG. One direction is from the low temperature end LT to the high temperature end HT. The other direction is from the high temperature end HT to the low temperature end LT. The flow rate waveform FR44 is provided in the normal operating mode. In the normal operation mode, both the magnetic field waveform and the flow rate waveform change symmetrically in one cycle. The normal operation mode is also called an isothermal cycle mode or an adiabatic cycle mode.

In FIG. 4, the temperature distribution at the time of starting by the flow rate waveform FR44 is shown. The horizontal axis represents the length L of the MCE element 7 in the cascade connection direction. The vertical axis shows the temperature TEMP of the MCE element 7. Consider the startup of the MHP device 2. It is assumed that the temperature of the MHP device 2 is stable at the initial temperature Ti before starting. The initial temperature Ti is also the outside air temperature. At startup, it is assumed that the temperature distribution of the MHP device 2 is stable at the initial temperature Ti as shown by the broken line.

Consider the temperature change when the MHP device 2 is started by the flow rate waveform FR44. Consider activation after the MHP device 2 has been left in the outside air temperature for a long period of time. First, the initial partial element that exerts the magnetic heat quantity effect at the initial temperature Ti repeats heat generation and endothermic. As a result, a temperature gradient is generated in the initial partial element. As the operation of the MHP device 2 continues, the range of the temperature gradient expands. The number of partial elements that exert the magnetic heat effect is increased.

Further, external heat is applied to the MCE element 7 in addition to the heat generation and endothermic heat caused by the MCE element 7. Disturbing heat includes, for example, the heat capacity of the MHP device 2, the heat generated by the power source 5, the heat generated by the electric circuit, and the like. Disturbing heat impedes the growth of the temperature gradient towards the cold end LT. Disturbing heat supports the growth of the temperature gradient towards the hot end HT. As a result, during the start-up period when the temperature gradient grows, the rate at which the temperature gradient extends toward the high temperature end HT is faster than the rate at which the temperature gradient extends toward the low temperature end LT. In other words, during the start-up period, the temperature rise width dTh44 extending from the initial temperature Ti toward the high temperature end HT is larger than the temperature decrease width dTc44 spreading from the initial temperature Ti toward the low temperature end LT (dTh44> dTc44). From another point of view, in the activation period, the activation length extending from the initial partial element toward the high temperature end HT is longer than the activation length extending from the initial partial element toward the low temperature end LT. In the flow rate waveform FR44, it takes a long time for both the high temperature end HT and the low temperature end LT of the MHP device 2 to reach the planned temperatures TH and TL. In other words, the flow rate waveform FR44 has a long start-up time.

Many air conditioners 1 and MHP devices 2 utilize the cold heat output at the cold end LT. The temperature of cold heat is lower than the temperature of the outside air. Therefore, the difference (TH-Ti) between the initial temperature Ti and the planned temperature TH at the high temperature end HT is smaller than the difference (Ti-TL) between the initial temperature Ti and the planned temperature TL at the low temperature end LT (TH-Ti < Ti-TL). The operating temperature condition of the MHP device 2 also makes the length of the start-up time according to the flow rate waveform FR44 remarkable.

Returning to FIG. 3, the stroke ST45 produces the flow rate waveform FR45 shown by the solid line. The flow rate waveform FR45 causes the medium 8 to flow in one direction during the excitation period MGPR and the medium 8 to flow in the other direction during the degaussing period DEMG. The flow rate waveform FR45 is provided in the accelerated operation mode. In the accelerated operation mode, the magnetic field waveform, the flow rate waveform, or both the magnetic field waveform and the flow rate waveform change asymmetrically in one cycle.

However, the flow rate waveform FR45 has a suppression period REPR in which the flow rate of the medium 8 is suppressed in the degaussing period DEMG. The maximum flow rate FR45m of the flow rate waveform FR45 is larger than the maximum flow rate FR44m of the flow rate waveform FR44. The flow rate during the suppression period REPR is smaller than the flow rate during the residual period of the degaussing period DEMG. In this embodiment, the flow rate during the residual period of the degaussing period DEMG is the maximum flow rate FR45 m. The flow rate in the suppression period REPR is smaller than the maximum flow rate FR45m of the flow rate waveform FR45. In this embodiment, the flow rate during the suppression period REPR is 0 (zero). The flow rate integrated value provided by the flow rate waveform FR44 and the flow rate integrated value provided by the flow rate waveform FR45 are set to be equal.

The suppression period REPR is provided at the beginning of the degaussing period DEMG. The suppression period REPR is provided so as to at least partially overlap the reduction period MG-. In this embodiment, the suppression period REPR completely overlaps with the reduction period MG-. The suppression period REPR starts at time t3 and ends at time t4.

During the suppression period REPR, the external magnetic field applied to the MCE element 7 is removed. During the suppression period REPR, the temperature of the MCE element 7 decreases. In particular, during the reduction period MG-, the external magnetic field applied to the MCE element 7 is removed. During the reduction period MG-, the temperature of the MCE element 7 decreases. In the suppression period REPR, the low temperature of the MCE element 7 acts to lower the temperature of the MCE element 7 without being carried away to the medium 8. In other words, the MCE element 7 stores cold. Further, the period of the maximum flow rate FR45 m following the suppression period REPR may reduce the heat exchange efficiency between the MCE element 7 and the medium 8. In this case, cold storage during the suppression period REPR is likely to be maintained.

Therefore, the heat transport device 21 has a suppression period REPR that suppresses the amount of heat exchange between the MCE element 7 and the medium 8 during the degaussing period DEMG. The heat transport device 21 provides a suppression period REPR by stopping the flow of the medium 8 in the early stages of the degaussing period DEMG. As a result, the heat transport device 21 is set so that the first heat exchange amount Q1 is larger than the second heat exchange amount Q2 (Q1> Q2). The heat transport device 21 has a normal operation mode in which the first heat exchange amount Q1 and the second heat exchange amount Q2 are equal (Q1 = Q2). Further, the heat transport device 21 is configured to be switchable between a accelerated operation mode and a normal operation mode.

In FIG. 5, the temperature distribution at the time of starting by the flow rate waveform FR45 is shown. The conditions are the same as in FIG. Consider the temperature change when the MHP device 2 is started by the flow rate waveform FR45.

The temperature gradient also gradually widens when the flow waveform FR45 is provided. Further, ambient heat is applied to the MCE element 7. Further, in the flow rate waveform FR45, the MCE element 7 stores cold. The temperature drop due to this cold storage at least partially offsets the temperature rise due to the disturbance heat. The temperature drop due to cold storage hinders the growth of the temperature gradient in the direction toward the high temperature end HT. The temperature drop due to cold storage supports the growth of the temperature gradient in the direction towards the cold end LT.

By giving the MCE element 7 a temperature drop due to cold storage, the growth of the temperature gradient in the direction toward the low temperature end LT is supported. In this case, the growth rate of the temperature gradient in the high temperature direction may still exceed the growth rate of the temperature gradient in the low temperature direction. Nevertheless, the growth rate of the temperature gradient generated by the flow waveform FR45 in the low temperature direction is higher than the growth rate of the temperature gradient generated by the flow waveform FR44 in the low temperature direction. As a result, the flow rate waveform FR45 shortens the start-up time.

In the preferred form, the growth rate of the temperature gradient in the high temperature direction may antagonize the growth rate of the temperature gradient in the low temperature direction. The two growth rates may be equal. For example, during the start-up period, the temperature rise width dTh45 is equal to the temperature fall width dTc45 (dTh45 = dTc45). In this case, the startup time is clearly reduced.

In a more desirable form, the growth rate of the temperature gradient in the high temperature direction is smaller than the growth rate of the temperature gradient in the low temperature direction. For example, during the start-up period, the temperature rise width dTh45 is smaller than the temperature decrease width dTc45 (dTh45 <dTc45). In this case, the startup time is significantly reduced. Therefore, the flow rate waveform FR45 including the suppression period REPR realizes a shorter start-up time than the flow rate waveform FR44 not including the suppression period REPR. Further, the flow rate waveform FR45 may provide a temperature decrease width dTc45 having a temperature increase width dTh45 or more during the start-up period (dTh45 ≦ dTc45). In other words, the cool-down operation time of the MHP device 2 is shortened.

In FIG. 6, the control process 180 for switching between the flow rate waveform FR44 and the flow rate waveform FR45 is shown. The control process 180 is executed by the control device 35. In step 181 the control device 35 determines whether or not the elapsed time timer from the start of the MHP device 2 exceeds the preset threshold time Tth0. Step 181 provides timer processing. If the elapsed time timer does not exceed the threshold time Tth0, the process proceeds to step 182. In step 182, the control device 35 selects the track 45 by the switch 34. As a result, the flow rate waveform FR45 is provided. This promotes the activation of the MHP device 2. Step 182 provides a accelerated driving mode. The accelerated operation mode is also called a cold storage operation mode. The accelerated operation mode is also referred to as a start-up operation mode, a temperature rise suppression mode, and a temperature decrease promotion mode. If the elapsed time timer exceeds the threshold time Tth0, the process proceeds to step 183. In step 183, the control device 35 selects the track 44 by the switch 34. As a result, the flow rate waveform FR44 is provided. As a result, the MHP device 2 is operated stably. Step 183 provides a normal operation mode. The control device 35 defines the period of the accelerated operation mode executed prior to the normal operation mode by a timer.

In this embodiment, the suppression period REPR is provided only in the degaussing period DEMG. In addition to this, the suppression period REPR may be provided in the excitation period MGPR. The suppression period REPR (D) in the degaussing period DEMG is set longer than the suppression period REPR (M) in the excitation period MGPR. In this case, a temperature decrease width dTc45 having a temperature increase width dTh45 or more is provided. As a result, the cool-down operation time of the MHP device 2 is shortened.

In this embodiment, the suppression period REPR is provided only in the degaussing period DEMG. Instead of this, the suppression period REPR may be provided only in the excitation period MGPR. Further, the suppression period REPR (M) in the excitation period MGPR may be set longer than the suppression period REPR (D) in the degaussing period DEMG. In this case, the MCE element 7 stores heat during the suppression period REPR. Therefore, the growth rate of the temperature gradient in the high temperature direction is supported. Such a modification is suitable for applications where the high temperature provided from the high temperature end HT is utilized. For example, it is suitable when the MHP device 2 is used for heating purposes. The suppression period REPR in the excitation period MGPR contributes to shortening the start-up time until the temperature of the high temperature end HT reaches the planned temperature TH. In other words, the warm-up operation time of the MHP device 2 is shortened.

According to the embodiment described above, the first heat exchange amount Q1 between the MCE element 7 and the medium 8 during the excitation period MGPR and the second heat exchange amount between the MCE element 7 and the medium 8 during the degaussing period DEMG. It is different from Q2. The heat exchange amounts Q1 and Q2 are set by the magnetic field modulator 11 and / or the heat transport device 21. As a result, the startup time required for the MHP device 2 to provide the planned heat output is reduced.

Second Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, different heat exchange amounts are provided by switching the flow rate waveform. Alternatively, different amounts of heat exchange may be provided by switching the magnetic field waveform.

As illustrated in FIG. 7, the cam mechanism 33 has a cam profile 243. The cam profile 243 has only track 44. The magnetic field modulator 11 can adjust the change waveform of the magnetic field applied to the MCE element 7. The magnetic field modulator 11 additionally or optionally comprises an electromagnet (EMG) 211a to make the magnetic field variable. The magnetic field modulator 11 provides at least two magnetic field waveforms. The MHP device 2 includes a switch 236. The switch 236 is provided by a drive circuit that excites the electromagnet 211a in the magnetic field modulator 11. The switch 236 switches the magnetic field waveform. The MHP device 2 includes a control device 35. The control device 35 controls the switch 236. The control device 35 switches the magnetic field waveform, for example, by executing the control process 180 of the preceding embodiment. In the control process 180, the flow rate waveform FR44 is replaced by the magnetic field waveform CMP, and the flow rate waveform FR45 is replaced by the magnetic field waveform EMB2.

In FIG. 8, the change in the flow rate of the medium 8 and the change in the magnetic field MG are illustrated. The heat transport device 21 provides a fixed flow waveform FR44. The magnetic field modulator 11 provides an increasing period MG + and a decreasing period MG−. The increase period MG + is longer than the decrease period MG- (MG +> MG-). It is desirable that the difference between the increasing period MG + and the decreasing period MG- be set so as to promote the growth rate of the temperature gradient in the low temperature direction against the disturbance heat. The increase period MG + accounts for 50% or more of the excitation period MGPR. The reduction period MG- is less than 50% of the degaussing period DEMG. As the increase period MG + becomes longer, the rate of increase of the external magnetic field applied to the MCE element 7 is suppressed. The magnetic field waveform EMB2 of this embodiment increases slowly and decreases rapidly. As a result, the MCE element 7 generates heat slowly as compared with the magnetic field waveform CMP of the comparative example shown by the broken line. A predetermined amount of the medium 8 flows off the MCE element 7 before the MCE element 7 generates heat. Therefore, the amount of heat exchange during the excitation period MGPR is suppressed more than the amount of heat exchange during the degaussing period DEMG. As a result, the MHP device 2 that suppresses the temperature rise and promotes the temperature drop is provided. As a result, the cool-down operation time of the MHP device 2 is shortened.

In the application where the high temperature provided from the high temperature end HT is utilized, the increase period MG + is set shorter than the decrease period MG- (MG + <MG-), or the increase period MG + is the decrease period MG. Set equal to-(MG + = MG-). In these cases, the warm-up operation time of the MHP device 2 is shortened. When the increase period MG + is set shorter than the decrease period MG-, the warm-up operation time of the MHP device 2 is significantly shortened.

Also in this embodiment, the amount of heat exchange between the MCE element 7 and the medium 8 during the excitation period MGPR and the amount of heat exchange between the MCE element 7 and the medium 8 during the degaussing period DEMG are different. The magnetic field modulator 11 is set so that the first heat exchange amount Q1 is larger than the second heat exchange amount Q2 (Q1> Q2). As a result, the startup time required for the MHP device 2 to provide the planned heat output is reduced.

Third Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the flow rate waveform or the magnetic field waveform is switched. Alternatively, different heat exchange amounts may be provided by switching both the flow rate waveform and the magnetic field waveform.

In FIG. 9, the MHP device 2 includes a cam profile 43 of the first embodiment and a magnetic field modulation device 11 of the second embodiment. The MHP device 2 includes a control device 35 that controls both the switch 34 and the switch 236. The control device 35 switches between both the flow rate waveform and the magnetic field waveform, for example, by executing the control process 180 of the preceding embodiment. In the control process 180, in step 182, both the flow rate waveform FR45 and the magnetic field waveform EMB2 are provided, and in step 183, both the flow rate waveform FR44 and the magnetic field waveform CMP are provided.

In FIG. 10, in this embodiment, both the flow rate waveform FR45 and the magnetic field waveform EMB2 are provided in the cold storage operation during the start-up period. In normal operation after startup, both the flow rate waveform FR44 and the magnetic field waveform CMP are provided. Also in this embodiment, the amount of heat exchange between the MCE element 7 and the medium 8 during the excitation period MGPR and the amount of heat exchange between the MCE element 7 and the medium 8 during the degaussing period DEMG are different. The magnetic field modulator 11 and the heat transport device 21 are set so that the first heat exchange amount Q1 is larger than the second heat exchange amount Q2 (Q1> Q2). As a result, the startup time required for the MHP device 2 to provide the planned heat output is reduced.

Fourth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the control device 35 defines the time of the accelerated operation (cold storage operation) by the timer. Instead, the period of accelerated operation can be specified based on observed values such as temperature information.

In FIG. 11, the MHP device 2 includes a temperature sensor 437 that observes the temperature of the medium 8 at the low temperature end LT. The observation signal TEMP1 by the temperature sensor 437 is input to the control device 35. The observed temperature TEMP1 is an example of the observed temperature related to the temperature of the MCE element 7.

In FIG. 12, a control process 480 for switching between the flow rate waveform FR44 and the flow rate waveform FR45 is shown. The control process 480 is executed by the control device 35. In step 484, the control device 35 determines the operation mode required for the MHP device 2. If the required operating mode is the cooling mode (COOL), the process proceeds to step 485. If the required operating mode is other than the cooling mode, the process ends. Step 484 provides a mode determination unit that determines that the operation mode is a cooling mode suitable for cold storage operation. In other words, step 484 provides a prohibition control that prohibits the cold storage operation at startup in an operation mode that is not suitable for the cold storage operation.

In step 485, the control device 35 determines whether or not the observation signal TEMP1 is lower than the threshold temperature Tth1. If TEMP1 <Tth1 is positive, the process proceeds to step 183. If TEMP1 <Tth1 is negative, the process proceeds to step 182. Therefore, the control device 35 repeats the cold storage operation in step 182 until the observation signal TEMP1 falls below the threshold temperature Tth1. Eventually, when the observation signal TEMP1 falls below the threshold temperature Tth1, the control device 35 shifts to the normal operation in step 182. Further, in step 486, the control device 35 determines whether or not the observation signal TEMP1 is higher than the threshold temperature Tth2. If TEMP1> Tth2 is positive, the process returns to step 182. If TEMP1> Tth2 is negative, processing returns to step 183. The threshold temperature Tth2 is higher than the threshold temperature Tth1.

As illustrated in FIG. 13, the two threshold temperatures Tth1 and Tth2 provide hysteresis characteristics with respect to the observed signal TEMP1. As a result, frequent switching between start-up operation and normal operation is suppressed. According to this embodiment, the period of the accelerated operation mode (cold storage operation) is defined based on the temperature information of the low temperature end LT provided by the observation signal TEMP1. The control device 35 defines the period of the accelerated operation mode executed prior to the normal operation mode based on the observed temperature TEMP1 related to the temperature of the MCE element 7.

Fifth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In this embodiment, the period of the cold storage operation is defined based on the observed value of the temperature of the MCE element 7.

As shown in FIG. 14, the MHP device 2 includes a temperature sensor 538 that directly observes the temperature of a part of the MCE element 7. It is desirable that the temperature sensor 538 is provided in the MCE element 7 in the vicinity of the low temperature end LT in the MHP device 2 that utilizes the cold storage operation. The observation signal TEMP2 by the temperature sensor 538 is input to the control device 35. The observation signal TEMP2 is used in the control device 35 in place of the observation signal TEMP1 of the preceding embodiment. Also in this embodiment, the period of the cold storage operation is defined based on the temperature information provided by the observation signal TEMP2.

Sixth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the period of the cold storage operation is defined. Instead of this, the period of the heat storage operation may be specified based on the observed value.

As shown in FIG. 15, the MHP device 2 includes a temperature sensor 639 that observes the temperature of the medium 8 at the high temperature end HT. The observation signal TEMP3 by the temperature sensor 639 is input to the control device 35. The MHP device 2 utilizes the high temperature provided by the high temperature end HT. In this embodiment, the switch 34 is controlled so that the start-up time until the temperature of the high temperature end HT reaches the planned temperature is shortened. In this embodiment, in the accelerated operation mode, the heat storage operation is executed instead of the cold storage operation. The observation signal TEMP3 defines the period of heat storage operation. In this embodiment, the period of the heat storage operation, which is the accelerated operation mode, is defined based on the temperature information provided by the observation signal TEMP3.

In the heat storage operation, the magnetic field modulator 11 and / or the heat transport device 21 are set so that the first heat exchange amount Q1 is smaller than the second heat exchange amount Q2 (Q1 <Q2). The heat generated in the MCE element 7 due to the magnetic calorific value effect raises the temperature of the MCE element 7 without being carried away by the medium 8. The heat storage operation can be realized, for example, by setting a suppression period for suppressing the flow rate FR in at least a part of the increase period MG +. The heat storage operation can be realized, for example, by making the increase period MG + shorter than the decrease period MG−. Also in these cases, the amount of heat exchange between the MCE element 7 and the medium 8 during the excitation period MGPR and the amount of heat exchange between the MCE element 7 and the medium 8 during the degaussing period DEMG are different. Those skilled in the art can understand the method for realizing the heat storage operation based on the cold storage operation in the preceding embodiment.

Seventh Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the period of the cold storage operation or the period of the heat storage operation is defined. Instead, both the period of the cold storage operation and the period of the heat storage operation may be specified based on the observed values.

As illustrated in FIG. 16, the MHP device 2 includes both a temperature sensor 437 and a temperature sensor 639. When the MHP device 2 is used as the low temperature source by the air conditioner 1, the MHP device 2 uses the low temperature provided from the low temperature end LT. When the MHP device 2 is used as the high temperature source by the air conditioner 1, the MHP device 2 utilizes the high temperature provided from the high temperature end HT. The air conditioner 1 switches between a case of using a low temperature and a case of using a high temperature according to the operation mode. The air conditioner 1 can switch the operation mode of the MHP device 2 according to, for example, the cooling mode and the heating mode. In this embodiment, for example, in the cooling mode, the cold storage operation is executed during the period from the initial temperature to the predetermined value of the observed temperature of the temperature sensor 437. As a result, the startup time in the cooling mode is shortened. In this embodiment, for example, in the heating mode, the heat storage operation is executed in the period from the initial temperature to the predetermined value of the observed temperature of the temperature sensor 639. This shortens the startup time in the heating mode.

In FIG. 17, the control process 790 executed by the control device 35 is illustrated. In step 791, the control device 35 selects a cooling mode (COLD) and a heating mode (HOT). In the cooling mode, the process proceeds to step 485. In the heating mode, the process proceeds to step 792. Steps 485, 183, 486, 182 are the same as the preceding embodiments. In step 792, the control device 35 determines whether or not the observation signal TEMP3 is higher than the threshold temperature Tth3. If TEMP3> Tth3 is positive, the process proceeds to step 793. If TEMP3> Tth3 is negative, the process proceeds to step 795. Therefore, the control device 35 repeats the heat storage operation in step 795 until the observation signal TEMP3 exceeds the threshold temperature Tth3. Eventually, when the observation signal TEMP3 exceeds the threshold temperature Tth3, the control device 35 shifts to the normal operation in step 793. Further, in step 794, the control device 35 determines whether or not the observation signal TEMP3 is lower than the threshold temperature Tth2. If TEMP3 <Tth2 is positive, processing returns to step 795. If TEMP3 <Tth2 is negative, processing returns to step 793. The threshold temperature Tth3 is higher than the threshold temperature Tth4.

As illustrated in FIG. 18, the two threshold temperatures Tth3 and Tth4 provide hysteresis characteristics with respect to the observed signal TEMP3. As a result, frequent switching between start-up operation and normal operation is suppressed. The period of the heat storage operation is defined based on the temperature information of the high temperature end HT provided by the observation signal TEMP3. According to this embodiment, the MHP device 2 includes both a cold storage operation mode and a heat storage operation mode, and can selectively switch between them. In the cold storage operation mode, the first heat exchange amount Q1 in the excitation period MGPR is larger than the second heat exchange amount Q2 in the degaussing period DEMG. In the heat storage operation mode, the first heat exchange amount Q1 is smaller than the second heat exchange amount Q2. As a result, the start-up time is shortened in both the cooling mode and the heating mode.

Eighth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, switching between normal operation and cold storage operation, or switching between normal operation and heat storage operation is executed. Instead, the MHP device 2 may perform a cold storage operation or a heat storage operation for the entire operation period.

In FIG. 19, the control process 880 executed by the control device 35 is illustrated. The control process 880 includes only step 889. Step 889 is provided by step 182 for cold storage operation or step 795 for heat storage operation. Also in this embodiment, the startup time is shortened.

Ninth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the second and third embodiments, the magnetic field modulator 11 includes an electromagnet 211a. Alternatively, the magnetic field modulator 11 may include a permanent magnet that provides the magnetic field waveform EMB2.

In FIGS. 20 and 21, the MHP device 2 includes a magnetic field modulation device 11. FIG. 21 shows a cross section of XXI-XXI in FIG. The magnetic field modulator 11 includes a permanent magnet 911a as a magnetic force source. The permanent magnet 911a is rotatable. The permanent magnet 911a can move in the rotation direction RT. The permanent magnet 911a is driven by the power source 5. The MCE element 7 is stationary. The permanent magnet 911a moves relative to the MCE element 7. The permanent magnet 911a provides an excitation period MGPR and a degaussing period DEMG by relative movement. The MCE element 7 may move with respect to the permanent magnet 911a.

The magnetizing pattern of the permanent magnet 911a is set to give the magnetic field waveform EMB2 to the MCE element 7. The magnetizing pattern can be set by the magnetizing direction of the permanent magnet 911a or the magnetizing strength. In the illustrated example, the magnetizing pattern is set by changing the magnetizing direction of the permanent magnet 911a. The magnetizing direction is also called a magnetizing vector. In the figure, the white arrow indicates the magnetizing direction of the permanent magnet 911a. The distribution in the magnetizing direction gradually changes along the rotation direction RT of the permanent magnet 911a. The magnetizing direction is greatly inclined with respect to the radial direction in the preceding portion 911b of the rotation direction RT. The magnetizing direction is slightly inclined with respect to the radial direction in the subsequent portion 911c of the rotation direction RT. The inclination angle in the magnetizing direction with respect to the radial direction gradually decreases from the leading portion 911b toward the succeeding portion 911c. The magnetizing direction coincides with the radial direction in the subsequent portion 911c. As a result of the gradual change in the magnetizing direction, the strength of the radial magnetic field applied to the MCE element 7 also gradually changes.

In FIG. 22, the relationship between the magnetic field waveform EMB2 and the rotation angle of the permanent magnet 911a is shown. In FIG. 22, the waveform diagram (a) shows the strength of the magnetic field MG in the radial direction in the MCE element 7a. In FIG. 22, the cross-sectional view (b) shows the angle of rotation of the permanent magnet 911a at time t91. In FIG. 22, the cross-sectional view (c) shows the angle of rotation of the permanent magnet 911a at time t92. The strength of the magnetic field MG in the radial direction in the MCE element 7a changes as the permanent magnet 911a rotates. The increase period MG + is longer than the decrease period MG-. Therefore, in the increasing period MG +, the medium 8 that flows away without heat exchange with the MCE element 7 is generated. As a result, the MHP device 2 is provided in which the amount of heat exchange between the MCE element 7 and the medium 8 during the excitation period MGPR and the amount of heat exchange between the MCE element 7 and the medium 8 during the degaussing period DEMG are different.

Other Embodiments The disclosure in this specification, drawings and the like is not limited to the exemplified embodiments. The disclosure includes exemplary embodiments and modifications by those skilled in the art based on them. For example, disclosure is not limited to the parts and / or element combinations shown in the embodiments. Disclosure can be carried out in various combinations. The disclosure can have additional parts that can be added to the embodiment. The disclosure includes the parts and / or elements of the embodiment omitted. Disclosures include replacement or combination of parts and / or elements between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. Some technical scopes disclosed are indicated by the claims description and should be understood to include all modifications within the meaning and scope equivalent to the claims statement.

Disclosure in the description, drawings, etc. is not limited by the description of the scope of claims. The disclosure in the specification, drawings, etc. includes the technical ideas described in the claims, and further covers a wider variety of technical ideas than the technical ideas described in the claims. Therefore, various technical ideas can be extracted from the disclosure of the description, drawings, etc. without being bound by the description of the claims.

In the above embodiment, the pump 31 is adopted. Instead, the heat transfer device 21 may include a non-volumetric pump that provides unidirectional flow. In this case, the heat transport device 21 includes a valve mechanism for converting a unidirectional flow into a reciprocating flow. The valve mechanism can be provided by various valve mechanisms such as a rotary switching valve and an on-off switching valve.

In the above embodiment, the flow rate FR in the suppression period REPR is 0 (zero). Instead of this, the flow rate in the suppression period REPR may be a predetermined suppression flow rate. However, the suppressed flow rate is smaller than the flow rate in the remaining period of the degaussing period DEMG.

1 Air conditioner, 2 Magnetic heat effect type heat pump device (MHP), 3 High temperature heat exchanger, 4 Low temperature heat exchanger, 5 Power source, 6 Housing, 7 Magnetic heat effect element (MCE), 8 Medium, 11 Magnetic field modulator (MGMD), 21 Heat Transport Device (THMD), 31 Pump, 32 Link Mechanism, 33 Cam Mechanism, 34 Switch (SW), 35 Control Device (CTR), 41 Cam Follower, 42 Cam Rotor, 43 Cam Profile, 44, 45 Track, 180 control process, HT high temperature end, LT low temperature end, MGPR excitation period, MG + increase period, DEMG demagnetization period, MG-decrease period, REPR suppression period, ST44, ST45 stroke amount, FR44, FR45 flow waveform, TH, TL Planned temperature, dTc44, dTc45 temperature decrease width, dTh44, dTh45 temperature increase width, Tth0 threshold time,
211a electromagnet, 236 switch, 243 cam profile,
437 temperature sensor, 480 control process,
538 temperature sensor,
639 temperature sensor,
790 control processing,
880 control processing,
911a Permanent magnet, 911b leading part, 911c trailing part,
TEMP, TEMP1, TEMP2, TEMP3 observation temperature,
Tth1, Tth2, Tth3, Tth4 threshold temperature.

Claims (10)

A magnetic heat quantity effect element (7) that is arranged between the high temperature end (HT) and the low temperature end (LT) and exerts a magnetic heat quantity effect,
A medium (8) that exchanges heat with the magnetic heat effect element and
A magnetic field modulator (11) that periodically modulates the strength of the external magnetic field so that the excitation period for applying an external magnetic field to the magnetic heat effect element and the degaussing period for removing the external magnetic field are alternately repeated.
A heat transport device (21) that reciprocally generates relative movement between the magnetic heat effect element and the medium is provided.
The magnetic field modulator and / or the heat transport device includes a first heat exchange amount between the magnetic heat effect element and the medium during the excitation period, and a second heat exchange amount between the magnetic heat effect element and the medium during the demagnetization period. A thermomagnetic cycle device that is set to differ from the amount of heat exchange. The thermomagnetic cycle device according to claim 1, wherein the magnetic field modulator and / or the heat transport device is set so that the first heat exchange amount is larger than the second heat exchange amount (Q1> Q2). .. The thermomagnetic cycle device according to claim 2, wherein the heat transport device has a suppression period (REPR) for suppressing the amount of heat exchange between the magnetic heat quantity effect element and the medium during the degaussing period. The thermomagnetic cycle device according to claim 3, wherein the heat transport device provides the suppression period (REPR) by stopping the flow of the medium at the beginning of the degaussing period. The magnetic field modulator
An increasing period (MG +) that increases the external magnetic field during the exciting period, and
It has a reduction period (MG-) that reduces the external magnetic field in the degaussing period.
The thermomagnetic cycle apparatus according to any one of claims 2 to 4, wherein the increase period is a period longer than the decrease period (MG +> MG−). Any one of claims 1 to 5, wherein the magnetic field modulator and / or the heat transport device is set so that the first heat exchange amount is smaller than the second heat exchange amount (Q1 <Q2). The thermomagnetic cycle device described in. The magnetic field modulator and / or the heat transport device
Accelerated operation mode in which the first heat exchange amount and the second heat exchange amount are different,
The thermomagnetic cycle apparatus according to any one of claims 1 to 6, wherein the first heat exchange amount and the second heat exchange amount are equal (Q1 = Q2) and can be switched to a normal operation mode. .. Further, a control device (35) for controlling the magnetic field modulator and / or the heat transport device is provided.
The thermomagnetic cycle device according to claim 7, wherein the control device defines a period of the accelerated operation mode that is executed prior to the normal operation mode. The control device defines the period of the accelerated operation mode based on the time of the accelerated operation mode (timer) or the observed temperature (TEMP1, TEMP2, TEMP3) related to the temperature of the magnetic heat effect element. The thermomagnetic cycle apparatus according to claim 8. The accelerated operation mode is
A cold storage operation mode in which the first heat exchange amount is larger than the second heat exchange amount,
Including a heat storage operation mode in which the first heat exchange amount is smaller than the second heat exchange amount.
The thermomagnetic cycle device according to any one of claims 7 to 9, wherein the magnetic field modulator and / or the heat transport device is configured to be able to switch between the cold storage operation mode and the heat storage operation mode.

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