Refrigeration equipment and control method thereof

Abstract

The invention discloses refrigeration equipment and a control method thereof.The refrigeration equipment comprises a refrigeration compartment, an object containing part, a friction nanometer generator and a control panel, the object containing part, the friction nanometer generator and the control panel are arranged in the refrigeration compartment, and the friction nanometer generator is tightly attached to the object containing part; the friction nanometer generator comprises an electrode layer and a high polymer material layer which are oppositely arranged up and down, and an external circuit connected with the electrode layer and the high polymer material layer, and the control panel is electrically connected to the external circuit and used for monitoring electric signals of the external circuit. On one hand, due to the fact that the structure of the friction nanometer generator is good in flexibility, the friction nanometer generator is more convenient to assemble, on the other hand, the structure of the friction nanometer generator is relatively thin, the occupied space of the friction nanometer generator is relatively small, and due to the combination of the two factors, the friction nanometer generator can be conveniently assembled in a larger range; and therefore, the operation condition in the refrigeration equipment can be mastered more integrally.

Description

Technical Field

[0001] The invention relates to a refrigeration device, and in particular to a control method of the refrigeration device. Background Art

[0002] At present, the perception of food ingredients in refrigeration equipment can be achieved through infrared detection, image recognition, weighing sensors and other technologies. Among them, infrared and image recognition both use optical detection methods, which have limited detection range and cannot be recognized by occlusion. The cost of weighing sensors is relatively high, and how to lay them out is limited by the structure of the refrigeration equipment, which will occupy a relatively large space, limiting its application prospects in refrigeration equipment. Therefore, these existing technologies for sensing food ingredients have their own shortcomings and cannot meet the development needs of intelligent refrigeration equipment. Summary of the invention

[0003] In order to solve at least one of the various problems in the prior art regarding the perception of the inside of a refrigeration device, the present invention aims to provide a refrigeration device and a control method thereof that can perform detection economically and efficiently. 。

[0004] To achieve the above-mentioned purpose, an embodiment of the present invention provides a refrigeration device, including a refrigeration compartment and a storage device arranged in the refrigeration compartment. The refrigeration device also includes:

[0005] A friction nanogenerator is installed close to the object placement item, the friction nanogenerator includes an electrode layer and a polymer material layer arranged opposite to each other up and down, and an external circuit connected to the electrode layer. When an object is placed on the object placement item, the relative distance between the electrode layer and the polymer material layer, or between two adjacent polymer material layers, decreases, and a forward current is generated in the external circuit. When an object is removed from the object placement item, the relative distance between the electrode layer and the polymer material layer, or between two adjacent polymer material layers, increases, and a reverse current is generated in the external circuit.

[0006] A control board, wherein the control board is electrically connected to the external circuit, and the control board is used to monitor the electrical signal of the external circuit.

[0007] As a further improvement of the present invention, the friction nanogenerators are arranged in a plurality of arrays on the upper surface of the placement object, and are used to generate different electrical signals at different positions on the placement object.

[0008] As a further improvement of the present invention, the electrode layer and the polymer material layer are both arranged as multiple layers, each polymer material layer is connected to one electrode layer, a group of the external circuits is connected between two adjacent electrode layers, and two adjacent external circuits are arranged in series.

[0009] As a further improvement of the present invention, the storage device includes a shelf, and the friction nanogenerator is installed close to the upper surface of the shelf.

[0010] As a further improvement of the present invention, the storage element includes a drawer, and the friction nanogenerator is installed close to the lower surface of the drawer. When the drawer is located in the refrigeration room, the drawer abuts against the friction nanogenerator.

[0011] As a further improvement of the present invention, a temperature-sensitive material is arranged in the polymer material layer, and the temperature-sensitive material includes poly (N-isopropylacrylamide), methyl cellulose, or polyurethane.

[0012] As a further improvement of the present invention, the friction nanogenerator further comprises a waterproof and breathable film arranged on the uppermost layer, and the electrode layer and the polymer material layer are sealed and arranged between the waterproof and breathable film and the placement element.

[0013] As a further improvement of the present invention, a gas-sensitive material is arranged in the polymer material layer; the friction nanogenerators are arranged in a plurality of arrays, and different gas-sensitive materials are arranged in the polymer material layers in different friction nanogenerators.

[0014] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a control method for a refrigeration device, wherein the refrigeration device further includes a refrigeration system, and the control method includes the following steps:

[0015] When a forward current is detected in the external circuit, the refrigeration system is controlled to increase the refrigeration capacity;

[0016] When it is detected that a reverse current is generated in the external circuit, the refrigeration system is controlled to reduce the refrigeration capacity.

[0017] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a control method for a refrigeration device, wherein the refrigeration device further comprises a refrigeration system, wherein the control board continuously obtains an electrical signal that is generated in an external circuit and changes periodically, and when the relative distance between the electrode layer and the polymer material layer or between two adjacent polymer material layers decreases, the current decreases, and the control method comprises the steps of:

[0018] When the average value of the electrical signal obtained in the external circuit is relatively reduced, controlling the refrigeration system to increase the refrigeration capacity;

[0019] When the average value of the electrical signal acquired in the external circuit increases relatively, the refrigeration system is controlled to reduce the refrigeration capacity.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the refrigeration equipment and its control method are detected through a friction nanogenerator. On the one hand, due to the good flexibility of the structure of the friction nanogenerator, it is easier to assemble. On the other hand, the structure of the friction nanogenerator is relatively thin, so the space it occupies is relatively small. The combination of these two factors can further facilitate the assembly of a wider range of friction nanogenerators, thereby making it easier to grasp the operating conditions in the refrigeration equipment from a larger overall perspective, which is conducive to the intelligent development of refrigeration equipment and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a refrigeration device according to an embodiment of the present invention;

[0022] Figure 2a It is a schematic structural diagram of a storage device according to one embodiment of the present invention;

[0023] Figure 2b is a schematic structural diagram of a storage device according to another embodiment of the present invention;

[0024] Figure 2c is a structural schematic diagram of a storage device according to another embodiment of the present invention;

[0025] Figure 3 is a structural schematic diagram of a state change of a friction nanogenerator according to an embodiment of the present invention;

[0026] Figure 4 is a schematic structural diagram of another state change of a friction nanogenerator according to an embodiment of the present invention;

[0027] Figure 5 is a flow chart of a control method according to a first embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of one state of current changing with time in the first embodiment of the present invention;

[0029] Figure 7 is a schematic diagram of another state of current changing with time in the first embodiment of the present invention;

[0030] Figure 8 is a flow chart of a control method according to a second embodiment of the present invention;

[0031] Fig. 9 is a schematic diagram of one state of current changing with time in the second embodiment of the present invention;

[0032] Fig.10 is a schematic diagram of another state of current changing with time in the second embodiment of the present invention;

[0033] Fig.11is a schematic diagram of a state where current changes with time in a third embodiment of the present invention;

[0034] Among them, 100, refrigeration equipment; 101, refrigeration compartment; 10, storage piece; 20, friction nanogenerator; 21, electrode layer; 22, polymer material layer; 23, external circuit; 24, waterproof and breathable film; 30, drawer. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0036] It should be understood that the terms used herein, such as "upper", "above", "lower", "below", etc., indicating spatial relative positions, are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings. The terms of spatial relative positions may be intended to include different orientations of the device in use or operation other than the orientation shown in the drawings.

[0037] An embodiment of the present invention provides a refrigeration device capable of economical and efficient detection and a control method thereof.

[0038] The refrigeration device 100 of this embodiment may be a refrigerator, a freezer, a vertical refrigerator, a wine cabinet, etc. The following embodiments may be described by taking a refrigerator as an example. Figure 1 As shown, the refrigerator includes a box body, an inner tank arranged in the box body, a refrigeration space with an opening surrounded by the inner tank, a door body covering the opening, and a refrigeration system. Some storage parts 10 can be arranged in the refrigeration space. The storage parts 10 of this embodiment can include shelves and drawers 30, both of which are used to place items. The refrigeration system may include a compressor, a condenser, a capillary tube, an evaporator, connecting pipes, etc. The compressor will generate certain vibrations when working, and the vibrations can become relatively subtle through the vibration reduction unit.

[0039] In order to clearly express the position and direction described in this embodiment, in this embodiment, the direction of reference gravity is defined as downward, and the reverse direction is upward. Multiple layers of shelves can be arranged from top to bottom in the refrigerator, and the door body is closed and open in front of the box body, and the reverse direction is rear. In addition, the forward and reverse directions hereinafter refer to different directions of current flow, and are not limited to specific directions. The forward and reverse directions can also be interchanged.

[0040] The refrigeration device 100 further includes a friction nanogenerator 20 and a control board. The friction nanogenerator 20 generates an electrical signal, and the control board receives and detects the electrical signal to detect the condition or operation of the food in the refrigerator.

[0041] The friction nanogenerator 20 of this embodiment is installed close to the object 10. Figure 2a to 2c As shown, the friction nanogenerator 20 includes an electrode layer 21 and a polymer material layer 22 arranged opposite to each other, and an external circuit 23 connected to the electrode layer 21. The distance between the electrode layer 21 and the polymer material layer 22, or between two adjacent polymer material layers 22, can change relatively. Different polymer material layers 22 have different triboelectric properties, which will generate certain friction charges. The friction charges flow in the circuit to form current. Therefore, the friction nanogenerator 20 can utilize the coupling of the triboelectric effect and the electrostatic induction effect to convert tiny mechanical energy into electrical energy. The control board is electrically connected to the external circuit 23, and the control board is used to monitor the electrical signals of the external circuit 23.

[0042] exist Figure 2a and 2b In the embodiment, the electrode layer 21 and the polymer material layer 22 are each provided with one layer. At this time, one end of the external circuit 23 is grounded and the other end is connected to the electrode layer 21. At this time, the external circuit 23 can detect the relative change of the distance between the electrode layer 21 and the polymer material layer 22.

[0043] exist Figure 2c In the embodiment, the electrode layer 21 and the polymer material layer 22 are both provided with two layers, and the two ends of the external circuit 23 are respectively connected to one electrode layer 21. Generally, one polymer material layer 22 can be positively charged after friction, and one polymer material layer 22 can be negatively charged after friction. At this time, the external circuit 23 can detect the relative change of the distance between the two polymer material layers 22.

[0044] The friction nanogenerator 20 has the advantages of being light in texture and low in price. It can reflect the mechanical energy generated by putting an object in and taking it out by the relative change in position between the electrode layer 21 and the polymer material layer 22, or between two adjacent layers of the polymer material layer 22, which can be further converted into an electrical signal by the friction nanogenerator 20 and captured and analyzed.

[0045] Furthermore, if Figure 1 As shown, the storage device 10 includes a shelf, and the friction nanogenerator 20 is installed close to the upper surface of the shelf. This facilitates the routing of the friction nanogenerator 20 on the shelf and facilitates accurate detection of changes in objects on the shelf.

[0046] Or in other embodiments, continue as Figure 1As shown, the storage device 10 includes a drawer 30, and the friction nanogenerator 20 is installed close to the lower surface of the drawer 30. When the drawer 30 is located in the refrigeration compartment 101, the drawer 30 abuts against the friction nanogenerator 20. This can facilitate the routing of the friction nanogenerator 20 on the drawer 30 and facilitate accurate detection of changes in the objects in the drawer 30.

[0047] like Figure 3 As shown, when an object is placed on the storage device 10 , the relative distance between the electrode layer 21 and the polymer material layer 22 , or between two adjacent polymer material layers 22 , decreases, and a forward current is generated in the external circuit 23 .

[0048] like Figure 4 As shown, when an object is removed from the storage device 10 , the relative distance between the electrode layer 21 and the polymer material layer 22 , or between two adjacent polymer material layers 22 , increases, and a reverse current is generated in the external circuit 23 .

[0049] Furthermore, the triboelectric nanogenerators 20 are arranged in a plurality of arrays on the upper surface of the storage device 10 to generate different electrical signals at different positions on the storage device 10. The triboelectric nanogenerators 20 arranged in an array can sense the specific position of the object placed, facilitating precise control.

[0050] In addition, if the electrode layer 21 and the polymer material layer 22 are both set as multiple layers, each polymer material layer 22 is connected to one electrode layer 21, and a set of external circuits 23 is connected between two adjacent electrode layers 21, and two adjacent external circuits 23 are set in series. This can avoid the problem that when only one layer is set, if the current generated is too small and the speed is too fast to be accurately detected, a larger current can be generated and accurately detected by setting multiple layers in series.

[0051] Correspondingly, the present invention provides two embodiments of the control method of the refrigeration equipment 100, wherein Embodiment 1 can be understood as an embodiment when the compressor is not working, or a state when the compressor is working and the vibration transmitted to the friction nanogenerator 20 is completely eliminated, and Embodiment 2 can be understood as a state when the compressor is working and the vibration energy transmitted to the friction nanogenerator 20 can be detected by the friction nanogenerator 20.

[0052] Example 1

[0053] like Figures 5 to 7 As shown, the control method includes the steps of:

[0054] Step S10 : monitoring the current change of the external circuit 23 .

[0055] Step S21: if it is obtained that a forward current is generated in the external circuit 23, then step S22 is executed;

[0056] Step S22: Control the refrigeration system to increase the refrigeration capacity;

[0057] Step S31: if it is obtained that a reverse current is generated in the external circuit 23, then step S32 is executed;

[0058] Step S32: Control the refrigeration system to reduce the refrigeration capacity.

[0059] The electrode layer 21 and the polymer material layer 22 of this embodiment can be set to one or more layers. The forward current and reverse current generated in the circuit can correspond to the increase and decrease of the relative distance between the electrode layer 21 and the polymer material layer 22, respectively. The following is an example of setting one layer of the electrode layer 21 and the polymer material layer 22. Others, such as setting two or more layers of the electrode layer 21 and the polymer material layer 22, can be adjusted accordingly according to the principles below. In addition, if the corresponding relationship is opposite, it can also be implemented according to the same principle.

[0060] Ginseng Figure 3 In the upper part, according to the principle of friction electrification, the polymer material layer 22 obtains a certain amount of charge, and the charge carried by the electrode layer 21 is opposite to the induced charge of the polymer layer and reaches a balance, so no current is generated in the external circuit 23. Figure 3 In the lower part, according to the law of electrostatic induction and charge conservation, the reduction of the interlayer distance between the polymer material layer 22 and the electrode layer 21 will lead to an increase in the amount of positive charge (positive or negative charge may vary depending on the material of the polymer material layer 22) in the induction band of the electrode layer 21, and electrons flow from the upper electrode layer 21 to the lower polymer material layer 22 through the external circuit 23, thereby generating an instantaneous current in the external circuit 23. This charge transfer amount increases with the increase of the deformation distance until the deformation reaches the maximum, and then a new charge balance will be generated. At this time, the state of the current change over time is parameter Figure 6 As shown. In the process of deformation recovery, Figure 4 As shown, the polymer material layer 22 moves upward, the charge balance is broken again, and the electrons flow in the opposite direction to generate an opposite instantaneous current. At this time, the state of the current changing with time is Figure 7 shown.

[0061] Therefore, during the cycle of pressing and releasing the friction nanogenerator 20, due to the change in the distance between the polymer material layer 22 and the electrode layer 21 (if the Figure 2c In the embodiment, the distance between the polymer material layer 22 and the polymer material layer 22 changes, which will cause the charge to be redistributed through the external circuit 23, generating a pair of opposite instantaneous currents, thereby converting mechanical energy into electrical energy.

[0062] Through the change of the current in this process, it can be judged whether the friction nanogenerator 20 is pressed or released, and correspondingly, it can be judged whether food is placed or removed. If food is placed, step S22 is executed to increase the cooling capacity of the refrigerator. If food is removed, step S32 is executed to reduce the cooling capacity of the refrigerator.

[0063] Example 2

[0064] In this embodiment, since the vibration of the compressor is periodic, the change of the current detected by the friction nanogenerator 20 is also periodic. Correspondingly, the control board continuously obtains the periodically changing electrical signal generated in the external circuit 23. At this time, it is assumed that the current will decrease when the relative distance between the electrode layer 21 and the polymer material layer 22 decreases (if the relative distance between the electrode layer 21 and the polymer material layer 22 is reduced). Figure 2c In the embodiment, the reduction of the distance between the polymer material layer 22 and the polymer material layer 22 reduces the current; if the relative distance between the electrode layer 21 and the polymer material layer 22 is reduced, the current will increase. The following contents are replaced in the opposite manner, and the principle is the same. The control method is as follows: Figures 8 to 10 As shown, the steps include:

[0065] Step S40: The compressor starts working.

[0066] When the compressor is working, the following will be generated in the friction nanogenerator 20: Fig. 9 Or the case where the current in the starting state 10 changes periodically with time.

[0067] Step S50: continuously acquiring the periodically changing electrical signal generated in the external circuit 23 .

[0068] Step S60 : monitoring the current change of the external circuit 23 .

[0069] Step S71: If the mean value of the electrical signal obtained in the external circuit 23 is relatively reduced, execute step S72.

[0070] Step S72: Control the refrigeration system to increase the refrigeration capacity.

[0071] Correspondingly, the schematic diagram of this situation is as follows Fig. 9 As shown, the principle at this time is the same as that of the embodiment 1 above, except that in the periodic change of the current over time, the current first changes suddenly, and then the mean value of the electric signal decreases relatively, so it is considered that the relative distance between the electrode layer 21 and the polymer material layer 22 changes in this case. Fig. 9 During the change process, although the current will increase at the moment of inserting the object, the current will continue to decrease accordingly due to the decrease in the relative distance between the electrode layer 21 and the polymer material layer 22, and the corresponding average value of the electrical signal will decrease accordingly. Fig. 9 The change in current can clearly indicate that more food has been added, making it easier to detect and judge.

[0072] Step S81: When the mean value of the electrical signal in the external circuit 23 is relatively increased, step S72 is executed.

[0073] Step S82: Control the refrigeration system to reduce the refrigeration capacity.

[0074] Correspondingly, the schematic diagram of this situation is as follows Fig.10 As shown, the principle is the same as in the above embodiment 1, except that in the periodic change of the current over time, the current suddenly changes, and then the mean value of the electrical signal increases relatively, so it is considered that the relative distance between the electrode layer 21 and the polymer material layer 22 changes in this case. Fig.10 During the change process, the current will increase at the moment when the food is taken away. Then, due to the increase in the relative distance between the electrode layer 21 and the polymer material layer 22, the current generated by the vibration caused by the compressor will increase accordingly. Fig.10 The change in current can clearly draw the conclusion that the total amount of food has decreased accordingly, making it convenient for detection and judgment.

[0075] Example 3

[0076] Furthermore, the polymer material layer 22 can also be doped with temperature-sensitive materials, gas-sensitive materials, humidity-sensitive materials and the like, so that the friction nanogenerator 20 has the ability to generate corresponding changes in electrical signals according to changes in the surrounding environment to indicate gas information.

[0077] Specifically, a temperature-sensitive material is disposed in the polymer material layer 22 , and the temperature-sensitive material includes poly (N-isopropylacrylamide), methyl cellulose, or polyurethane.

[0078] Furthermore, the friction nanogenerator 20 further includes a waterproof and breathable film 24 disposed on the uppermost layer, and the electrode layer 21 and the polymer material layer 22 are sealed and disposed between the waterproof and breathable film 24 and the storage element 10. The waterproof and breathable film 24 can isolate the influence of water vapor.

[0079] In addition, a gas-sensitive material is disposed in the polymer material layer 22; the friction nanogenerators 20 are disposed in a plurality of arrays, and different gas-sensitive materials are disposed in the polymer material layers 22 in different friction nanogenerators 20. Different gas-sensitive materials can react to different gases, making it convenient to judge the changes in the food materials corresponding to various gases, and also facilitating mutual correction.

[0080] In combination with Example 2 and Example 3, Fig.11 Example 3 is described.

[0081] When the refrigerator press is turned on, a slight vibration will naturally occur inside, and the vibration will be sensed by the friction nanogenerator 20 to generate an electrical signal, such as Fig.11 The beginning stage.

[0082] Then, an object is placed on top of the friction nanogenerator 20. The instantaneous squeezing of the food produces a large change in current. After that, since the friction nanogenerator 20 is squeezed, the current returns to a smaller fluctuation state over time.

[0083] Later, as the food is stored for a long time, some gases are produced by the food, such as alcohol and ester gases produced by aquatic products, and amine gases produced by meat. The surrounding gas environment changes, and the gas-sensitive material causes the triboelectric properties of the polymer material layer 22 to change, and the electrical signal changes accordingly. The later changes are as follows: Fig.11 Different concentrations of gas substances correspond to different changing states of the electrical signals, that is, the changing states of different electrical signals reflect the state of gas release under different states of maturity and freshness of the food. Therefore, the freshness and / or maturity of the food in the refrigeration device 100 can be judged according to the changes in the gas.

[0084] Compared with the commonly used technology, this embodiment has the following beneficial effects:

[0085] The refrigeration device 100 and the control method thereof are detected by means of the friction nanogenerator 20. On the one hand, due to the good flexibility of the structure of the friction nanogenerator 20, it is easier to assemble. On the other hand, the structure of the friction nanogenerator 20 is relatively thin, so the space it occupies is relatively small. The combination of these two factors can further facilitate the assembly of the friction nanogenerator 20 in a wider range, thereby making it easier to grasp the operating conditions in the refrigeration device 100 from a larger overall perspective, which is beneficial to the intelligent development of the refrigeration device 100 and improves the user experience.

[0086] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0087] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A refrigeration device, comprising a refrigeration compartment and a storage device arranged in the refrigeration compartment, characterized in that: The refrigeration equipment also includes: A friction nanogenerator is installed close to the object placement item, the friction nanogenerator includes a plurality of electrode layers, a plurality of polymer material layers, and an external circuit connected to the electrode layers. When an object is placed on the object placement item, the relative distance between the electrode layer and the polymer material layer, or between two adjacent polymer material layers, decreases, and a forward current is generated in the external circuit. When an object is removed from the object placement item, the relative distance between the electrode layer and the polymer material layer, or between two adjacent polymer material layers, increases, and a reverse current is generated in the external circuit. A control board, wherein the control board is electrically connected to the external circuit, and the control board is used to monitor the electrical signal of the external circuit.

2. The refrigeration equipment according to claim 1, characterized in that: The friction nanogenerators are arranged in a plurality of arrays on the upper surface of the placement object, and are used to generate different electrical signals at different positions on the placement object.

3. The refrigeration equipment according to claim 1, characterized in that: The electrode layer and the polymer material layer are both arranged in multiple layers, each polymer material layer is connected to one electrode layer, a group of the external circuits is connected between two adjacent electrode layers, and two adjacent external circuits are arranged in series.

4. The refrigeration equipment according to claim 1, characterized in that: The storage device includes a shelf, and the friction nanogenerator is installed closely against the upper surface of the shelf.

5. The refrigeration equipment according to claim 1, characterized in that: The storage element comprises a drawer, and the friction nanogenerator is installed closely against the lower surface of the drawer. When the drawer is located in the refrigeration room, the drawer abuts against the friction nanogenerator.

6. The refrigeration device according to claim 1, characterized in that: A temperature-sensitive material is arranged in the polymer material layer, and the temperature-sensitive material includes poly (N-isopropylacrylamide), methyl cellulose, or polyurethane.

7. The refrigeration device according to claim 1, characterized in that: The friction nanogenerator also includes a waterproof and breathable film arranged on the uppermost layer, and the electrode layer and the polymer material layer are sealed and arranged between the waterproof and breathable film and the placement element.

8. The refrigeration equipment according to claim 1 or 7, characterized in that: A gas-sensitive material is arranged in the polymer material layer; the friction nanogenerators are arranged in a plurality of arrays, and different gas-sensitive materials are arranged in the polymer material layers in different friction nanogenerators.

9. A method for controlling a refrigeration device, characterized in that: The refrigeration device as claimed in any one of claims 1 to 8, further comprising a refrigeration system, and the control method comprising the steps of: When a forward current is detected in the external circuit, the refrigeration system is controlled to increase the refrigeration capacity; When it is detected that a reverse current is generated in the external circuit, the refrigeration system is controlled to reduce the refrigeration capacity.

10. A method for controlling a refrigeration device, characterized in that: The refrigeration device is as claimed in any one of claims 1 to 8, the refrigeration device also includes a refrigeration system, the control board continuously obtains the electrical signal generated in the external circuit that changes periodically, and when the relative distance between the electrode layer and the polymer material layer or between two adjacent polymer material layers decreases, the current decreases, and the control method includes the steps of: When the average value of the electrical signal obtained in the external circuit is relatively reduced, controlling the refrigeration system to increase the refrigeration capacity; When the average value of the electrical signal acquired in the external circuit increases relatively, the refrigeration system is controlled to reduce the refrigeration capacity.

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