CN103828500B - Cooling device for box - Google Patents

Abstract

The invention provides a cooling device for a box body, wherein the cooling device (1) for the box body comprises: an air heat exchanger (20); an electronic cooler (30) in which a Peltier element (35) is disposed between a heat-absorbing-side heat sink (31) and a heat-discharging-side heat sink (33); and a control unit (40) that controls the driving of the fans (22, 23), the heat absorption fan (32), the heat exhaust fan (34), and the Peltier element (35) of the air heat exchanger (20) on the basis of the temperature (T1) inside the case, the outside air temperature (T2), and the cold air temperature (T3) of the Peltier element (35). The control unit (40) drives the fans (22, 23) under the condition of (T2< T1) when the temperature rises to a first set temperature within a preset normal operating temperature range in the box body, stops the driving of the fans (22, 23) when the temperature rises to a second set temperature higher than the first set temperature, and drives and cools the Peltier element (35) under the condition of (T3 ≧ SVB; SVB is a predetermined dew condensation determination value).

Description

Cooling device for box

technical field

The present invention relates to a cooling device for a box that cools a box that accommodates components that generate heat, such as a control board (also referred to as a heating element).

Background technique

Conventionally, there is known a cooling device that cools the inside of a box housing the heat generating body as described above to a constant temperature or lower. For example, Patent Document 1 discloses a cooling device in which a cooling device in which an air heat exchange type air conditioner and a refrigerant type air conditioner are integrated is provided in a housing. This cooling device is configured to use an air heat exchange type air conditioner and a refrigerant type air conditioner according to the temperature inside the cabinet and the temperature of the outside air, and a plurality of such cooling devices are installed according to the heat generating load (the number of heat generating elements). In addition, Patent Document 2 discloses a structure in which the internal air passage from the box and the external air passage from the outside of the box are arranged independently, and an air heat exchange element is arranged at the intersection of the two, and the heat absorption The Peltier element is arranged so that the part faces the internal air passage on the rear side thereof, and the heat radiation part faces the external air passage on the rear side. In such a cooling device, when the temperature of the internal air passing through the air heat exchange element is high, cooling is performed by the Peltier element.

In addition, Patent Document 3 discloses a cooling device that can manage humidity at temperatures other than the temperature in the housing. In this cooling device, a Peltier element is used, a humidity sensor is provided in a housing, and operation control is performed so that a dehumidification operation is performed when the humidity is equal to or higher than a predetermined value. In addition, Patent Document 4 discloses a cooling device in which a heat absorbing side of a Peltier element is brought into direct contact with a heating element housed in a housing to obtain a cooling effect.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2001-193995

Patent Document 2: Japanese Patent Laid-Open No. 2005-55025

Patent Document 3: Japanese Patent Laid-Open No. 2008-141089

Patent Document 4: Japanese Patent Laid-Open No. 2003-8275

Summary of the invention

The problem to be solved by the invention

However, the cooling device disclosed in the above-mentioned Patent Document 1 has a structure in which a plurality of cooling devices integrating the air heat exchange type air conditioner and the refrigerant type air conditioner are installed according to the load, so the installation space of the cooling device increases, and The cost also increases, and the control during cooling also becomes complicated. In addition, the cooling device disclosed in Patent Document 2 uses an air heat exchange element to heat the internal air when the temperature of the external air is higher than that of the internal air, and needs to use a Peltier element to cool the heated internal air. That is, in the structure disclosed in Patent Document 2, when the temperature of the outside air is high, more energy is required than when the inside air is cooled directly using the Peltier element.

In addition, the cooling device disclosed in the above-mentioned Patent Document 3 is equipped with a humidity sensor, and dehumidifies by operating the Peltier element when the humidity exceeds a predetermined value. However, condensed water is generated in a highly airtight box. Wait for the problem to arise. In addition, in the case of the cooling device disclosed in the above-mentioned Patent Document 4, when there are a plurality of heating elements in the box, it is necessary to have the same number of Peltier elements and heat sinks, which imposes restrictions on the number and installation method of the heating elements, and This also increases the cost, and the control during cooling also becomes complicated. In addition, since the Peltier element is brought into direct contact with the heat generating body, dew condensation may affect the heat generating body.

Contents of the invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cooling device that can efficiently cool the inside of the box without affecting the installation state of the heating element installed in the box. Another object of the present invention is to provide a cooling device capable of efficiently cooling the inside of a box and preventing generation of condensed water.

means to solve the problem

In order to achieve the above object, the cooling device for the box of the present invention is characterized in that the cooling device for the box has: an air heat exchanger, which is installed in the box that accommodates the heating element, and can be connected to the outside of the box. air-based heat exchange; an electronic cooler that exposes a heat-absorbing side radiator equipped with a heat-absorbing fan on the inside of the box, and exposes a heat-exhausting side radiator equipped with a heat-exhausting fan on the outside of the box , a cooling element is arranged between the heat-absorbing-side radiator and the heat-discharging-side radiator; Temperature T3 to control the drive of the fan of the air heat exchanger, the heat-absorbing fan, the heat-exhausting fan and the cooling element, the control unit is within the preset normal operating temperature range in the box, When rising to the first set temperature, the fan of the air heat exchanger is driven on the condition of (T2<T1), and when rising to the second set temperature higher than the first set temperature, The drive of the fan of the air heat exchanger is stopped, and the cooling element is driven to cool on the condition that (T3≧SVB; SVB is a predetermined dew condensation judgment value).

In the case cooling device having the above configuration, the air heat exchanger and the electronic cooler are arranged in the case containing the heating element, and the control unit controls the operation switching according to predetermined conditions, so that the case can be efficiently cooled. In this case, the switching control of the air exchanger and the electronic cooler is performed based on the temperature T1 inside the box, the temperature T2 of the outside air, and the temperature T3 of the cold air of the cooling element, so that an efficient cooling effect can be obtained, especially Within the pre-set normal operating temperature range in the box, when the temperature rises to the first set temperature, the fan of the air heat exchanger is driven, and the driving of the fan is based on (T2<T1), so When the temperature of the outside air is higher than the temperature in the box, the temperature in the box does not rise sharply by unnecessarily introducing high-temperature outside air into the box. Also, when the temperature rises further to the second set temperature higher than the first set temperature, the fan of the air heat exchanger is stopped to cool the cooling element (switching operation), so that the inside of the box can be efficiently cooled. In addition, the cooling drive of the cooling element is controlled to stop the cooling drive when the cool air temperature of the cooling element falls below the dew condensation judgment value (SVB), so that condensed water can be prevented from being generated in the box.

In the case cooling device with the above configuration, when the control unit falls to a third set temperature lower than the first set temperature within the normal operating temperature range, the The cooling element is thermally driven.

In this case, even if the temperature in the box is within the normal operating temperature range, since the temperature in the box is in a lowered state, by heating and driving the cooling element, the temperature in the box can be raised to an appropriate temperature and maintain.

In addition, in the cooling device for a box having the above configuration, the cooling element may be provided in parallel with a plurality of systems, and the control unit may turn on/off each system according to the temperature T1 inside the box. drive.

In such a structure, each system is sequentially operated according to the load (temperature load) of the heating element housed in the box, and it is possible to control with the minimum configuration (optimum capacity matching the load) suitable for the load. operation, energy saving can be achieved. In particular, by controlling the operation of each system step by step, the degree of oscillation of the temperature in the refrigerator can be improved compared with the structure of ON/OFF driving of the cooling element at a time.

In addition, in the configuration in which a plurality of systems of cooling elements are arranged in parallel, a plurality of cooling elements of a plurality of systems arranged in parallel may be connected in series.

By configuring in this way, it is possible to improve cooling and heating capabilities.

In addition, in the case cooling device configured as described above, the control unit may maintain the heat-absorbing fan in a driven state within the normal operating temperature range.

With such a configuration, in the box, the internal air is kept in a state of constant circulation by driving the heat-absorbing fan, and the temperature T1 inside the box can be stabilized.

In addition, in the case cooling device configured as described above, the control unit may be made to drive the heat exhaust fan when the temperature rises to the first set temperature within the normal operating temperature range.

With this configuration, the heat sink on the heat discharge side of the electronic cooler is cooled before the cooling element of the electronic cooler is driven to cool, so that the cooling efficiency of the electronic cooler can be improved and a rapid cooling effect can be exhibited. . In addition, since the heat exhaust fan is temporarily driven even after the cooling drive of the cooling element is stopped, the performance of the cooling element can be stably maintained over a long period of time.

In addition, in the case cooling device configured as above, the control unit may maintain the drive of the fan of the air heat exchanger and the heat absorbing unit when the upper limit of the normal operating temperature range is exceeded. The drive of the fan, the drive of the heat removal fan and the cooling drive of the cooling element.

In such a structure, the temperature inside the cabinet rises beyond the normal operating temperature range, so both the air heat exchanger and the electronic cooler can be driven to quickly cool the temperature inside the cabinet and return the cabinet to the normal operating temperature range . That is, since both the air heat exchanger and the electronic cooler are driven only when the temperature rises beyond the normal operating temperature range, efficient cooling operation can be realized.

In addition, in the case cooling device configured as described above, the control unit may stop the driving of the fan of the air heat exchanger, the suction, The drive of the heat fan, the drive of said heat extraction fan and the heating drive of the cooling element.

Normally, the temperature inside the box gradually rises due to the operation of the heating element, but when it is lower than the lower limit of the normal operating temperature range, each driving element may cause heating abnormalities, so by setting it to a stopped state, it is possible to Energy-saving operation and improved safety are realized.

Invention effect

According to the present invention, it is possible to efficiently cool the inside of the box without affecting the installation state of the heating element installed in the box, and the like. Moreover, the cooling device for housings which can prevent generation|occurrence|production of condensed water by efficient cooling in a housing|casing is obtained.

Description of drawings

FIG. 1 is an overall schematic configuration diagram showing an embodiment of a cooling device for a box according to the present invention.

FIG. 2 is a block diagram showing the configuration of a control unit that controls the operation of each driving unit of the cooling device for housings.

Fig. 3 is a control chart showing the state of the controlled operation of the air heat exchanger and the electronic cooler implemented by the control unit.

Fig. 4 is a graph showing the relationship between the temperature in the housing and the controlled operation of the electronic cooler.

detailed description

Hereinafter, one embodiment of the cooling device for a box according to the present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic diagram showing the overall structure of a box including a cooling device.

The box body 1 of the present embodiment is configured as a box-shaped box having a substantially rectangular cross-section partitioned by heat insulating walls 3 , and its internal space (hereinafter referred to as the storage room) 4 can pass through an opening and closing door 3A attached to the front surface portion 3A. ' to seal. Various heating elements such as a modem of communication equipment, a power supply unit, etc. are accommodated in the storehouse 4. In this embodiment, a rack 5 having a plurality of shelf boards 5a is arranged in the storehouse 4, and the shelf board 5a is provided with Various heating elements.

Cooling devices 10 for controlling and managing the temperature inside the box are distributed in the box 1 . This cooling device 10 includes: an air heat exchanger 20 arranged on the top plate portion 3B of the box body 1 and connecting the inside and outside of the box body; an electronic cooler 30 arranged on the back portion 3C and connecting the inside and outside of the box body; and a control unit. 40, which controls the operation of the air heat exchanger 10 and the electronic cooler 20. In this case, the control unit 40 may be installed at any position of the cabinet 1, and in this embodiment, it is installed on the shelf plate 5a of the rack 5 in the storage room 4. As shown in FIG. In addition, the cooling device 10 includes a sensor S1 for measuring the temperature T1 inside the box, a sensor S2 for measuring the temperature T2 of the outside air, and a sensor for measuring the temperature T3 of the cold air of the cooling elements constituting the electronic cooler 30 . S3, the temperature information detected by these sensors S1 to S3 is input to the control unit constituting the control unit 40 as will be described later, and becomes a trigger signal for controlling the operation of each driving element.

The air heat exchanger 20 is provided with a case 21 provided on the top plate portion 3B, inside the case 21, the internal air 22A is discharged by the fan 22 provided inside the top plate portion 3B, and the fan provided on the case 21 23 passes outside air 23A. In this case, the casing 21 in this embodiment has a flow path 21A through which the outside air 23A passes and a flow path 21B through which the inside air 22A passes. It is a structure in which the ground is formed independently up and down, and heat is exchanged by the wall surface 21C of the adjacent flow path. In addition, each of the flow paths 21A and 21B is preferably configured in a fin shape in order to facilitate heat dissipation.

It should be noted that the above-mentioned fans 22 and 23 are synchronously driven by the control unit of the control unit 40 .

The electronic cooler 30 is provided with a heat-absorbing side radiator (radiation fan) 31 arranged inside the cabinet and a heat-exhausting radiator 33 arranged outside the cabinet, and these structures are arranged so as to pass through the rear surface of the cabinet 1 Opening 3d formed in the mounting plate (not shown) of 3C. In this case, the electronic cooler 30 includes a Peltier element 35 as a cooling element, and the Peltier element 35 is arranged between the metal plate 36 connected to the mounting plate via a gasket and the heat sink ( Cooling fan) 31. In addition, the heat discharge side radiator 33 is mounted on the surface of the metal plate 36 opposite to the surface on which the Peltier element 35 is mounted. It should be noted that the Peltier element 35 is combined with the heat sink, and the heat sink can be formed of various structures with different fin shapes, or a structure with heat pipes.

At one end of the heat-absorbing side radiator 31, a heat-absorbing fan 32 is provided so that the internal air in the refrigerator passes through, and the internal air 32A in the refrigerator flows into the heat-absorbing side radiator 31 and is discharged from the other end. . In this case, the sensor S3 for measuring the cold air temperature T3 of the cooling element (Peltier element 35 ) is disposed at the other end as described above. In addition, a heat exhaust fan 34 is provided on one end side of the heat exhaust side radiator 33 to discharge the air stagnant in the heat exhaust side radiator 33, and the air heated by the Peltier element 35 is cooled. 34A is discharged out of the storage.

The aforementioned cooling element 35 , heat absorbing fan 32 and heat exhausting fan 34 are independently driven by the control unit of the control unit 40 . In this case, the heat-absorbing fan 32 and the heat-discharging fan 34 are preferably in a positional relationship such that the flow of air is opposed to each other in each radiator 31, 33. The air in the side radiator 33 is discharged upward to efficiently discharge heat, and it is preferable to dispose so that the internal air rises from the lower end.

In addition, in the above-mentioned structure, the material which comprises the said housing|casing 1 attaches importance to weather resistance and strength, and it is desirable to make an outer plate into stainless steel. Among them, aluminum materials are preferably used for light-shielding panels and frame members inside the box in consideration of weight reduction. In addition, it is preferable to use stainless steel as a material constituting the internal frame plate 5a (frame 5) and the like from the viewpoint of strength and dust resistance. In addition, for the above-mentioned metal plate 36, it is desirable to use a copper plate in terms of heat conduction, but it is preferable to use an aluminum material because of an increase in weight.

FIG. 2 is a block diagram showing the configuration of a control unit that controls the operation of each driving unit of the cooling device described above.

The control unit 40 has a control unit 41 that stores a predetermined operating program and controls the fans 22 and 23 of the air heat exchanger 20 and the electronic cooling system based on the detected temperature signals sent from the sensors S1 to S3. The heat absorption fan 32, the heat exhaust fan 34 and the driving function of the cooling element (Peltier element) 35 of the device 30. That is, the fans 22 and 23 of the air heat exchanger 20 are synchronously driven ON/OFF by the fan drive unit 42 equipped with a drive circuit, and the heat absorption fan 32 and the heat exhaust fan 34 of the electronic cooler 30 are respectively driven by a fan drive unit 42 equipped with a drive circuit. The driving parts 43 and 44 independently perform ON/OFF driving.

In addition, the Peltier element 35 of the present embodiment is provided with a plurality of systems in parallel (four systems of Peltier elements 35A to 35D are shown in FIG. Components perform ON/OFF drive control on a system-by-system basis. That is, the Peltier elements 35A to 35D of the respective systems independently perform heating/cooling driving and ON/OFF driving via the Peltier driving units 45 to 48 each having a driving circuit capable of reversing the polarity of a current.

It should be noted that, in the present embodiment, more specifically, cooling elements 35A to 35D of a plurality of systems are arranged in parallel so that a plurality of Peltier elements, specifically, two Peltier elements in each system are configured. Elements (35A, 35a1), (35B, 35b1), (35C, 35c1), (35D, 35d1) are connected in series. Of course, the system number of Peltier elements and the number of Peltier elements connected in series can be appropriately modified according to the specifications of the cooling device and the like.

Next, the control operation method by the control means 40 mentioned above is demonstrated concretely with reference to FIG. 3. FIG.

FIG. 3 shows a control diagram showing the fans 22, 23 of the air heat exchanger 20 and the heat absorption fan 32, heat exhaust fan 34 and Peltier fan 30 of the electronic cooler 30 implemented in the control section 41 of the control unit 40. An embodiment example of the control operation of the element 35.

The control unit 41 is within the preset normal operating temperature range R in the box, when the temperature T1 in the box rises to the first set temperature (SV2), the temperature T2 of the outside air is lower than the temperature T1 in the box ( T2<T1) is the condition, and the fans 22 and 23 of the air heat exchanger 20 are driven (refer to the control graph (a)). In addition, when the temperature T1 in the box rises to the second set temperature (SV3) higher than the first set temperature (SV2), the drive of the fans 22 and 23 of the air heat exchanger 20 is stopped (see the control chart (b )), and on the condition that the cold air temperature T3 of the Peltier element 35 is above the predetermined dew condensation judgment value (SVB) (T3≥SVB), the Peltier element 35 is cooled and driven (refer to the control chart (c) ).

As mentioned above, in the normal operating temperature range R in the box 1, when the internal temperature T1 rises to the first set temperature (SV2), by driving the fans 22 and 23 of the air heat exchanger 20, the rise can be controlled. The temperature in the warehouse is cooled. In this way, in the region where there is a difference between the temperature in the box and the outside air temperature, only the operation of the air heat exchanger 20 is provided, and the operation of the electronic cooler 30 is not performed, so energy saving can be achieved. In this case, the fans 22 and 23 are driven on the condition that the outside air temperature T2 < the inside air temperature T1 as described above, so when the outside air temperature is higher than the temperature inside the box, the high temperature will not be unnecessarily The outside air is introduced into the box body 1, so that the temperature in the box body 1 will not rise sharply. That is, the drive of the fans 22 and 23 of the air heat exchanger 20 is stopped until the temperature of the outside air becomes lower than the temperature inside the cabinet, and the heat from the outside is prevented from moving to the inside of the cabinet as much as possible.

Then, by stopping the driving of the fans 22 and 23, the temperature T1 in the box rises, and when it rises to the second set temperature (SV3) higher than the first set temperature (SV2), the Peltier element 35 is cooled. The drive is controlled so as to keep the interior of the cabinet at a constant temperature by cooling (refer to the control chart (c)). It should be noted that, when the Peltier element 35 fails in the entire system, the fans 22 and 23 are driven as they are on the condition that the external air temperature T2 < the internal air temperature T1, and cooling of the interior of the refrigerator is carried out ( Refer to control chart (b)*1).

When the cooling drive of the Peltier element 35 is performed, when the cold air temperature T3 of the Peltier element 35 becomes lower than a predetermined dew condensation judgment value (SVB), there is a possibility that the heat sink ( Since dew condensation occurs at the portion of the heat radiation fan) 31, the cooling drive is controlled to stop to prevent condensed water from being generated in the refrigerator (refer to the control chart (c)). That is, in the present embodiment, the cooling operation is controlled so as not to become a temperature range (below the dew condensation judgment value) where condensation is likely to occur at the portion where condensation is likely to occur, and the temperature inside the refrigerator is kept constant. control.

It should be noted that for the determination of dew condensation, for example, the dew point temperature may be determined by detecting the humidity sensor and the temperature inside the refrigerator, and the operation control may be performed. However, as in this embodiment, by predetermining the dew condensation determination value (SVB), Control items can be simplified by setting the temperature below this temperature as the dew point temperature and performing operation control. In addition, in this embodiment, even if the sensor S1 for detecting the temperature T1 in the box fails, the sensor S3 for measuring the cool air temperature T3 can be used instead.

In addition, the control unit 41 controls to maintain the driving of the fans 22 and 23 of the air heat exchanger 20 and the driving unit of the electronic cooler 30 when the upper limit value (SV3+10° C.) of the normal operating temperature range R is exceeded (SV3+10° C.). That is, the heat absorption fan 32 is driven, the heat exhaust fan 34 is driven, and the Peltier element 35 is cooled.

In this way, the temperature T1 inside the box 1 rises beyond the normal operating temperature range R, so both the air heat exchanger 20 and the electronic cooler 30 are driven to rapidly cool the temperature inside the box, and return the box to normal. Operating temperature range R. That is, since both the air heat exchanger 20 and the electronic cooler 30 are driven only when the temperature T1 in the housing rises beyond the normal operating temperature range R, efficient cooling operation can be performed.

As described above, according to the above-mentioned cooling device 10, the air heat exchanger 20 and the electronic cooler 30 are arranged in the box 1 that accommodates the heat generating body, and the control unit 40 performs switching control of the operation according to predetermined conditions, so it is possible to reduce the Operating cost, and can efficiently cool the box. In addition, the air heat exchanger 20 and the electronic cooler 30 are respectively switched to either drive or both drives in an optimal state, and it is not necessary to integrate the air heat exchanger and the electronic cooler into a cooling device according to the temperature of the heat generating body. Installing multiple units according to the load does not increase the installation space in the cabinet and increase the cost. In addition, the switching control of the air exchanger 20 and the electronic cooler 30 is performed based on the temperature T1 in the box, the temperature T2 of the outside air, and the temperature T3 of the cold air of the Peltier element 35, so an efficient cooling effect can be obtained. The cooling drive of the eartip element is controlled to stop the cooling drive when the temperature of the cold air becomes lower than the dew condensation judgment value (SVB), so that condensation water can be prevented from being generated in the box.

In addition, in the present embodiment, the control unit 41 is in the normal operating temperature range R, and when the temperature is lowered to the third set temperature (SV1) lower than the first set temperature (SV2), the temperature in par The ear sticker element 35 is controlled to be heated and driven (refer to the control table (d)).

In this case, in the normal operating temperature range R, since the temperature in the housing 1 is considerably lowered, by heating and driving the Peltier element 35, the temperature in the housing 1 can be raised to a more appropriate temperature and maintain. It should be noted that the temperature in the housing does not rise due to the above-mentioned heating operation of the Peltier element 35 (SV1-5°C or less), which is a range that does not occur in a normal operating state. Therefore, in this embodiment, in such a situation, there is a possibility of heating abnormality (exceeding the specified operating temperature range of the equipment), so all driving elements are controlled to stop, thereby improving safety. Alternatively, when the temperature in the chamber has become (SV1-5° C. or less) for a fixed period of time, the control unit 41 may issue an abnormality alarm to the outside as there is a possibility of heating abnormality.

In addition, the control unit 41 may perform control so as to maintain the heat absorption fan 32 of the electronic cooler 30 in the driving state within the normal operating temperature range R. With such a configuration, the heat-absorbing fan 32 is always driven in the box 1, so that the internal air is kept in a state of constant circulation, and the temperature T1 inside the box can be stabilized.

In addition, preferably, the control unit 41 drives the heat exhaust fan 34 of the electronic cooler 30 when the temperature T1 in the box rises to the first set temperature (SV2) within the normal operating temperature range R. way to control. This is because, when the Peltier element 35 is cooled and driven at the second set temperature (SV3), heat radiation from the Peltier element is included on the heating side of the Peltier element (heat exhaust side radiator 33). Slice portion, even after the Peltier element is stopped (even if the temperature in the chamber is lowered to the first set temperature SV2), it can temporarily continue to be in a higher state; and when the Peltier element 35 does not rapidly dissipate heat on the heating side , have an impact on the performance and life of the element, therefore, during the cooling operation of the Peltier element 35 (refer to the control graph (e)) and before and after it (refer to the control graph (f)), by controlling the exhaust heat fan 34 to In the driving state, heat can be dissipated rapidly on the heating side, and the temperature T1 inside the box can be prevented from rising to maintain the cooling effect, and the performance of the Peltier element 35 can be stabilized over a long period of time. It should be noted that the drive of the exhaust heat fan 34 may be linked with the cooling drive of the Peltier element 35, or may be driven for a constant time by using a delay timer or the like after the cooling drive of the Peltier element is stopped. control.

In addition, for the above-mentioned heat-absorbing fan 32 and heat-discharging fan 34, by synchronously driving the fans 22 and 23 of the air heat exchanger 20, the temperature in the box can be released to the outside by means of heat conduction, thereby enabling Stabilize the temperature inside the chamber.

In addition, in the cooling device of the present embodiment, a plurality of Peltier elements 35 constituting the electronic cooler 30 are arranged in parallel. In this case, the control unit 41 may also control the ON/OFF driving of each system according to the temperature T1 in the box. Specifically, for example, as shown in FIG. 4 , the temperature T1 in the box gradually decreases, and when the Peltier element 35 is heated and driven when falling from the third set temperature (SV1), the control unit 41 controls as follows: The Peltier element 35A system is driven at the time when the third set temperature (SV1) drops by 2°C, and the Peltier element 35B system is driven when the third set temperature (SV1) drops by 3°C. The Peltier element 35C system is driven when the set temperature ( SV1 ) falls by 4° C., and the Peltier element 35D system is driven to reach the maximum heating state when the set temperature ( SV1 ) falls by 5° C. from the third set temperature ( SV1 ). Then, when the temperature T1 in the housing is raised by such a control operation, the heating drive is sequentially controlled to be stopped for each system in the same manner.

In this way, by installing Peltier elements in multiple systems and controlling the operation of each system step by step, it is possible to improve the degree of temperature oscillation in the box compared to a structure that performs ON/OFF driving of the Peltier elements at a time. . In addition, in such a structure, each system can be operated sequentially according to the load (temperature load) of the heating element accommodated in the box 1, and the minimum structure suitable for the load (the minimum structure suitable for the load) can be used. Optimum performance) can be controlled to reduce operating costs and save energy. Of course, the above-mentioned stepwise control operation can also be implemented when the temperature T1 inside the box gradually rises to cool the Peltier element 35 so that the temperature inside the box becomes the second set temperature ( SV3 ) as a target.

In addition, in this embodiment, since the Peltier elements 35A-35D of several systems arranged in parallel are each connected in series, it is possible to improve cooling capability and heating capability.

As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment, Various deformation|transformation is possible.

For example, in the electronic cooler 30 described above, the structure in which the Peltier elements 35 are arranged for a plurality of systems and the operation is controlled stepwise can also be implemented in a cooling device without the air heat exchanger 20 . That is, in such a configuration, cooling (heating) driving control according to the load of the heating element can be realized, and the degree of oscillation can be improved to efficiently cool (heat) the inside of the box. In addition, the electronic cooler 30 may use, for example, a cooling structure based on a normal refrigerant cycle other than using a Peltier element.

In addition, the air heat exchanger 20 described above is configured to exchange heat through the partitioned wall surface 21C by heat conduction without direct contact between the internal air 22A and the external air 23A, but various modifications can be made to the heat exchange method. For example, various heat sinks, such as lattice fins in a laminated structure, may be provided in the housing 21 to exchange heat in the flow paths between the lattices.

In addition, by improving the airtightness of the above-mentioned box 1, a hygroscopic agent may be provided in the box 1 to have a humidity adjustment function.

Explanation of reference signs:

1 box

10 cooling device

20 air heat exchanger

22, 23 fans

30 electronic cooler

31 endothermic side radiator

32 endothermic fan

33 heat exhaust side radiator

34 heat exhaust fans

35 Peltier elements

40 control unit

41 Control Department

Claims (8)

1. A cooling device for a box, characterized in that, The cooling device for the box has: The air heat exchanger is provided in a box housing a heat generating body, and includes a case in which air inside the box is exhausted and outside air is passed through, thereby being able to communicate with the box. Air-based heat exchange between the exterior of the body; An electronic cooler that exposes a heat-absorbing side radiator equipped with a heat-absorbing fan inside the case, exposes a heat-discharging side radiator equipped with a heat-exhausting fan outside the case, and dissipates heat on the heat-absorbing side. A cooling element is arranged between the radiator and the heat exhaust side radiator; and a control unit that controls the fan of the air heat exchanger, the heat-absorbing fan, the heat-discharging fan, and The drive of the cooling element is controlled, The control unit performs switching control on the operation of the air heat exchanger and the electronic cooler according to predetermined conditions, so that within the preset normal operating temperature range in the box, when the temperature rises to the first set temperature, , on the condition that T2<T1, the fan of the air heat exchanger is driven, and when it rises to a second set temperature higher than the first set temperature, the drive of the fan of the air heat exchanger is stopped , and under the condition that T3≥SVB; SVB is a predetermined dew condensation judgment value, the cooling element is driven for cooling. 2. The cooling device for a box according to claim 1, wherein: The control unit heats and drives the cooling element when the normal operating temperature range falls to a third set temperature lower than the first set temperature. 3. The cooling device for the box according to claim 1 or 2, characterized in that, The cooling element is provided with multiple systems side by side, The control unit performs ON/OFF driving for each system according to the temperature T1 inside the box. 4. The cooling device for a box according to claim 3, wherein: The cooling elements of the plurality of systems arranged in parallel are each connected in series in plurality. 5. The cooling device for the box according to claim 1 or 2, characterized in that, The control unit maintains the heat-absorbing fan in a driven state within the normal operating temperature range. 6. The cooling device for the box according to claim 1 or 2, characterized in that, The control unit drives the heat exhaust fan when the normal operating temperature range rises to the first set temperature. 7. The cooling device for the box according to claim 1 or 2, characterized in that, The control unit maintains driving of the fan of the air heat exchanger, driving of the heat absorbing fan, driving of the heat exhausting fan, and cooling of the cooling element when the upper limit of the normal operating temperature range is exceeded. drive. 8. The cooling device for the box according to claim 1 or 2, characterized in that, The control unit stops the driving of the fan of the air heat exchanger, the driving of the heat absorbing fan, the driving of the heat exhausting fan, and the cooling element when the temperature is lower than the lower limit value of the normal operating temperature range. Heat driven.