KR100706179B1 - Drain vessel heater of natural convention type cooling device for low temperature storehouse - Google Patents

Abstract

The present invention is installed inside the low temperature warehouse, the above-mentioned natural convection cooling device for cold storage for supplying the cold air of the evaporator 130 directly connected to the bottom of the water collecting tank 150 for collecting condensate in a low temperature warehouse in a natural convection type The present invention relates to a collection tank heater of a cold storage natural convection type cooling device for heating the collection tank 150 to prevent the condensate collected in the collection tank 150 from freezing. The present invention, the heating pipe 150 is integrally wired to the temperature of the water collecting tank 150 is transferred, the heating pipe (212) for generating heat by the built-in heating wire (212a); A power supply unit 214 for applying power of a rated voltage to the heating line 212a of the heating pipe 212; Power of the power supply unit 214 applied to the heating line 212a according to the temperature of the heating pipe 212 having a temperature substantially the same as the temperature of the collecting tank 150 as the temperature of the collecting tank 150 is transferred. It includes; power control means for controlling the. The present invention, since the power control means is configured in a state integrated with the heating pipe 212 to sense the temperature of the heating pipe 212, it is possible to simplify the work process can improve the manufacturing efficiency of the cooling device. .

Warehouse, nature, convection, catchment, sensor

Description

DRAIN VESSEL HEATER OF NATURAL CONVENTION TYPE COOLING DEVICE FOR LOW TEMPERATURE STOREHOUSE}

1 is a conceptual diagram schematically showing the configuration of a natural convection cooling device for a low temperature warehouse according to the prior art,

Figure 2 is a perspective view of the sump heater of the cooling device shown in Figure 1,

3 is a side cross-sectional view of the sump heater shown in FIG.

4 is a block diagram showing the configuration of the sump heater shown in FIG.

5 is a perspective view showing a sump heater of a natural convection cooling device for a low temperature warehouse according to a first embodiment of the present invention;

6 is a block diagram showing a second embodiment of the sump heater shown in FIG.

7 is a side cross-sectional view showing the configuration of the sump heater shown in FIG.

FIG. 8 is a block diagram showing a third embodiment of the sump heater shown in FIG.

<Explanation of symbols for the main parts of the drawings>

130: evaporator 150: water tank

212: heating pipe 212a: heating wire

214: power supply unit 216: temperature sensor

218a: comparison unit 218b: switching unit

BM: Bimetallic H: Housing

The present invention is installed in a low temperature warehouse for storing crops, livestock products, fish and shellfish or food, and the natural low temperature warehouse for supplying the cold air of the evaporator connected directly to the low temperature warehouse to the low temperature warehouse by natural convection The present invention relates to a collecting tank heater of a natural convection cooling device for a low temperature warehouse which supplies high heat to a collecting tank of a convection cooling device and prevents condensate collected in the collecting tank from freezing.

In general, a cold storage device for a cold warehouse is a blower fan is installed inside the cold warehouse with an evaporator, the blower fan circulates the cold air of the evaporator. Therefore, the stored goods stored in the cold store lose freshness while drying in a short time. That is, a general low temperature warehouse cooling apparatus has a problem of shortening the freshness of the storage.

In order to solve this problem, the applicant of the present invention developed three types of natural convection cooling apparatus for cold storage by circulating the cold air in a natural convection type with the cooling fan is omitted, one patent to the Republic of Korea Patent Office And two utility model registration applications. In addition, patents were registered through examination, and in the case of an application for utility model registration, registration was determined and maintained through technical evaluation application. (Patents: Registration No. 502970, Utility Application: Registration No. 351711 and No. 351712)

The natural convection cooling system for cold storage registered in this way circulates cold air into natural convection, which has an effect of extending the storage period of the stored products stored in the cold storage by about three times.

However, such a registered air conditioner is heated to a temperature of approximately 21 ° C by an electric sump heater that generates intermittently high temperature heat according to a set time in which the sump collecting the condensate of the evaporator is heated, and thus, the sump due to the internal temperature difference of the low temperature warehouse. Condensation occurred on the surface of the.

In addition, since the sump heater generates heat at a temperature of about 21 ° C. in order to heat the sump, power for heating the sump heater is excessively consumed.

In addition, to prevent overheating of the sump heater, an overheat temperature controller (OHTC) that cuts off the power of the sump heater when the sump heater is overheated to a temperature of about 21 ° C. or higher is separate from the heating device of the sump heater. Had to be installed.

In addition, since the sump heater generates heat according to a set time regardless of the temperature of the sump, the sump can not be defrosted in time. In this way, if the defrost is not timely performed, even if the condensate is thickly frozen in the sump tank, the sump heater does not operate unless it reaches the set operating time. Operation stops before thawing all of the frozen condensate, so that the remaining frozen condensate continues to accumulate in the sump. In the end, the condensate dripping from the evaporator overflows the sump by the condensate frozen in a stacked state.

Accordingly, the applicant of the present invention filed a patent application to the Korean Intellectual Property Office on August 16, 2005 to improve the above-described registered air conditioner. Technology "

This prior art can prevent condensation and condensate freezing by operating the sump heater according to the temperature of the sump. Referring to the accompanying drawings, a cooling device according to the prior art will be described in more detail.

As shown in FIG. 1, the natural convection type cooling device according to the related art compresses and condenses a refrigerant by the compressor 110 and the condenser 120, the expansion valve 130a throttles the refrigerant, and the evaporator 130 includes Cool air from the refrigerant is discharged to the low temperature warehouse by natural convection.

At this time, condensate is generated by the temperature difference in the evaporator 130, and the condensate is collected in the sump tank 150 integrally installed at the bottom of the evaporator 130 as shown in FIG.

The sump tank 150 is provided with a sump heater for preventing freezing of the collected condensate. 2, 3, the sump heater 150 as the heating pipe 174 wired to the sump 150 is operated by the temperature sensor 172 for sensing the temperature of the sump 150. To prevent freezing.

As shown in FIG. 4, the heating pipe 174 is operated by the heating control means operating according to the sensed temperature of the temperature sensor 172. The heating control means applies power to the heating pipe 174 according to the freezing temperature (0 ° C) of the water collecting tank 150 sensed by the temperature sensor 172 to heat the heating pipe 174, and the temperature sensor ( 172 cuts off the power applied to the heating pipe 174 according to the thawing temperature (image 1 ° C to 5 ° C) of the collection tank 150 to stop the heating of the heating pipe 174. Thus, the sump 150 always maintains the temperature of the image 1 ° C to 5 ° C.

In this conventional technology, since the water collecting tank 150 maintains a constant temperature of 1 ° C to 5 ° C of the image by the heating pipe 174 operating according to the temperature of the temperature sensor 172, the condensation water is continuously frozen. There is an advantage that can be prevented.

In addition, as the sump tank 150 is heated to a temperature of 1 ° C to 5 ° C image temperature difference of the sump tank 150 and the low-temperature warehouse can be minimized, to prevent the condensation occurs in the sump tank 150 There are also benefits.

In addition, when the sump tank 150 is heated to a temperature of 1 ° C to 5 ° C image, the sump heater stops operation, when the sump tank 150 is cooled to 0 ° C, the sump heater is operated, the operating power of the sump heater It also has the advantage of saving power.

In addition, since the sump heater operates when the temperature of the sump tank 150 is cooled to 0 ° C., the sump tank 150 can be defrosted on time to prevent the condensate from freezing in the sump tank 150 as well as to be frozen while the condensed water is laminated. There is also an advantage that can be prevented. That is, since the sump heater defrosts when the condensate starts to freeze, condensate can be prevented from being stacked. Of course, since condensate is prevented from being frozen in a stacked state, it is also possible to prevent the condensate from overflowing the sump 150.

In addition, when the sump heater heats the sump tank 150 to a set temperature, the comparator 176a automatically cuts off the power of the sump heater, so that the overheat protector as described above is separately installed to prevent overheating of the sump heater. There is also the advantage of not needing.

In addition, the above-described overheat protector stopped the operation of the sump heater only when overheated. However, in the related art, the heating control means stops the operation of the sump heater by stopping the operation of the sump heater according to the thawing temperature detected by the temperature sensor 172. In addition to preventing, when the freezing temperature is sensed by the temperature sensor 172, the sump heater may be restarted. That is, the overheat protector operates only when overheated, but the heating control means operates not only during overheating but also when the sump tank 150 is cooled to the freezing temperature, so that there is a merit of gain.

However, such a prior art has to install the temperature sensor 172 to avoid the portion of the heating pipe 174 is wired so that the temperature sensor 172 is directly connected to the collection tank 150, it is not convenient to install the temperature sensor 172. In addition, since the manufacturing process of the collection tank heater and the temperature sensor 172 installation process are respectively performed during the manufacture of the cooling device, there is a disadvantage in that the manufacturing time of the cooling device is increased.

In the drawings, reference numeral 132 denotes a refrigerant pipe, 134 a support frame, 139 an end plate, 142 a heating pipe for defrosting the evaporator 130, 144 a power supply for supplying power to the heating pipe 142, 152 Is a heat insulating material, 154 is a drain pipe, 162 is a connecting member 162 to allow the passage of the bolt B fastened to the nut N, and 164 is a through hole through which the connecting member 162 is fixed.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, the temperature sensor and the heating pipe is integrated into a natural convection cooling device for cold storage operating in accordance with the temperature signal of the heating pipe detected by the temperature sensor The purpose is to provide a sump heater.

The collection tank heater of the low temperature warehouse natural convection type air conditioner according to the present invention is installed in the inside of the low temperature warehouse, and supplies the cold air of the evaporator directly connected to the low temperature warehouse to collect the condensate water to the low temperature warehouse in a natural convection type. A collection tank heater of a low temperature warehouse natural convection type cooling device for heating the sump of the low temperature warehouse natural convection type cooling device to prevent freezing of the condensed water collected in the collection tank, wherein the collection tank heater is integrally wired to the collection tank. A heat generating pipe in which the temperature of the water collecting tank is transferred and which generates heat by the built-in heating wire; A power supply unit for applying power of a rated voltage to a heating line of the heating pipe; And a power control means for controlling the power of the power supply unit applied to the heating line in accordance with the temperature of the heating pipe having a temperature substantially the same as the temperature of the collection tank as the temperature of the collection tank is transferred.

In the present invention, since the power control means is configured in an integrated state with the heating pipe in order to sense the temperature of the heating pipe, the work process can be simplified, thereby improving the manufacturing efficiency of the cooling device.

Hereinafter, with reference to the accompanying drawings illustrating a cold storage natural convection cooling device of the present invention as follows, Figure 5 is attached to the collection tank of the cold storage natural convection cooling apparatus according to a first embodiment of the present invention A perspective view of a heater. Here, the illustrated evaporator 130 emits cold air while circulating the refrigerant throttled by the outdoor unit and the expansion valve (not shown) through the refrigerant pipe 132. At this time, the evaporator 130 circulates the cold air in a natural convection type because a cold air circulation fan for forced circulation of the refrigerant is not provided as shown.

As shown in the drawing tank heater of the natural convection cooling device for a cold storage according to the first embodiment of the present invention, the lower portion of the evaporator 130 by the connecting member 162 surrounding the bolt (B) and the nut (N) It is installed in the sump 150 mounted on. The collection tank heater generates heat by the power supply unit 214 to which the heating pipe 212, which is wired in a jig, to the collection tank 150, applies a rated voltage. At this time, the power supply unit 214 is operated by a power control means to be described later, and converts the power supplied from the outside to the rated voltage of the heating pipe 212 to apply.

The power supply unit 214 supplies power to the heating wire 212a embedded in the heating pipe 212 through the lead wire 214a as shown in an enlarged manner. The lead wire 214a and the heating wire 212a are connected to each other as shown so as to enable energization. The heating wire 212a is embedded in the heating pipe 212 in a state of being wrapped in the insulating material 212b as shown.

The heating pipe 212 is closely and integrally wired to the lower surface of the sump 150 as shown by the clamp not shown. Thus, the heating pipe 212 has a temperature substantially the same as the temperature of the collection tank 150 as the temperature of the collection tank 150 is transitioned.

The above-described power supply control means controls the power of the power supply unit 214 applied to the heating line 212a according to the temperature of the heating pipe 212 having the same temperature as the collection tank 150.

The power control means includes, for example, a straight bimetal BM interposed between the lead wire 214a of the power supply unit 214 and the heating wire 212a of the heating pipe 212, as shown in an enlarged view; It can be configured to include; a housing (H) to operatively protect the bimetal (BM). At this time, the illustrated housing (H) is shown in a half section.

As shown, the bimetal BM is fixed to the terminal of the lead wire 214a of the power supply 214 by a pin. The other end is connected to the terminal of the heating line 212a of the heating pipe 212 in a free end state. At this time, the other end portion of the bimetal BM does not bend the heating wire 212a by its rigidity and thus maintains a tangential state. Therefore, the power of the power supply unit 214 is applied to the heating line 212a through the bimetal BM. Of course, the heating line 212a generates heat by the power applied through the bimetal BM. In this way, heat of the heating wire 212a that is generated is transmitted to the bimetal BM. That is, the bimetal BM is heated by the heat of the heating line 212a.

The bimetal BM is designed to be deflected at a temperature of, for example, images 1 ° C to 5 ° C. Therefore, when the bimetal BM is heated to the image 1 ° C to 5 ° C by the heating line 212a, the bimetal BM is refracted as shown by the broken line in the enlarged view, thereby releasing the connection state with the heating line 212a. That is, the lead wire 214a and the heating wire 212a which are continuous through the bimetal BM are disconnected as the bimetal BM is refracted. As the lead wire 214a and the heating wire 212a are disconnected as described above, power supply is cut off to the heating wire 212a.

The heating line 212a is cooled while the heat generation is stopped as the power supply is cut off. Therefore, the bimetal BM is gradually restored to the circular shape by the material property while being cooled together with the heating wire 212a. The circular restored bimetal BM reconnects the lead wire 214a and the heating wire 212a to apply the power of the power source 214 to the heating wire 212a. That is, the bimetal BM serves as a switch for controlling the power of the power supply unit 214 according to the temperature of the heating line 212a.

The housing H is formed in a box shape as shown in the figure, and the upper and lower portions are detachably configured, and both ends thereof are fixed to the ends of the lead wire 214a and the heating wire 212a by pins or screws. This housing H protects the bimetal BM while providing a space outside the bimetal BM as shown. Accordingly, the bimetal BM performs a switching operation to variably interrupt the energized state of the lead wire 214a and the heating wire 212a while refracting or circularly restoring the inside of the housing H.

On the other hand, the reason why the deflection deformation temperature of the bimetal BM is set to an image of 1 ° C to 5 ° C, the heating line 212a must be heated to a temperature of the image 1 ° C to 5 ° C, the heating pipe 212 This is because the sump 150 may be heated to about 1 ° C to 5 ° C image. Thus, the sump 150 may maintain an image to prevent the collected condensate from freezing.

The deformation temperature of the bimetal BM is alternatively designed among the images 1 ° C to 5 ° C so that the sump tank 150 maintains the image. For example, when the sump tank 150 is set to maintain an image of about 1 ° C, the deformation temperature of the bimetal BM is designed to 1 ° C. On the contrary, when the sump tank 150 is set to maintain an image of about 3 ° C, the deformation temperature of the bimetal BM is designed as an image of 3 ° C. Thus, the water collecting tank 1250 maintains a constant temperature of about 1 ° C or 3 ° C due to the heating pipe 212 in which the heating temperature is controlled by the bimetal BM.

Since the deformation temperature of such a bimetal (BM) can be modified in some cases, it is not limited to 1 ° C to 5 ° C as described above. That is, the deformation temperature of the bimetal BM may be designed at 1 ° C to 99 ° C. However, the deformation temperature of the bimetal (BM) is preferably designed to be 1 ° C to 65 ° C, more preferably it is designed to 1 ° C to 5 ° C as described above. Because, when the deformation temperature of the bimetal (BM) is designed to 1 ° C to 5 ° C, not only can the temperature deviation of the high temperature of the sump 150 and the low temperature warehouse be minimized, but also the heating pipe 212 most efficiently. Because it can operate. Of course, the water collecting tank 150 is maintained at a constant temperature of about 1 ° C to 5 ° C image by the heating pipe 212, the condensation does not occur as the internal temperature and the temperature deviation of the cold store is reduced as much as possible.

The operation of the sump heater according to the first embodiment of the present invention configured as described above will be described below with reference to FIG. 5. In the description, the deformation temperature of the bimetal BM is about 1 ° C in the sump tank 150. As an example, an image designed to be heated to 1 ° C is described.

In order to operate the sump heater, the power switch (not shown) of the power supply unit 214 is turned on. Accordingly, the power of the power supply unit 214 is applied to the heating line 212a of the heating pipe 212 via the bimetal BM through the lead wire 214a. Therefore, the heating line 212a heats the sump 150 cooled by the evaporator 130 through the heating pipe 212 while generating heat at an image of 1 ° C.

At this time, the heating pipe 212 may not maintain the temperature of the image 1 ° C completely by the cold air of the cooled sump (150). That is, the heating pipe 212 maintains a temperature of less than 1 ° C image by the cold air of the sump tank 150. Of course, the heating line (212a) by the heating pipe 212 also maintains a temperature of less than 1 ° C image.

However, when the water collecting tank 150 is gradually heated to change to an image of 1 ° C, the heating pipe 212 and the heating line 212a are changed to an image of 1 ° C. Accordingly, the bimetal BM cuts power applied to the heating line 212a while refracting deformation to stop the heating of the heating pipe 212.

As the exothermic pipe 212 stops the heat generation, the water collecting tank 150 is gradually cooled together with the exothermic pipe 212 by the cold air of the evaporator 130 and the internal cold air of the low temperature warehouse. At this time, the bimetal (BM) is also gradually restored to circular recovery. Therefore, the lead wire 214a of the power supply unit 214 and the heating wire 212a of the heating pipe 212 are connected and energized again by a bimetal BM that is circularly restored.

Here, the sump 150 is cooled to about 0 ° C when the bimetal (BM) is completely circular restored. That is, bimetal BM is circularly restored at the same time as the sump 150 is cooled to about 0 ° C. Therefore, the water collecting tank 150 is heated in the image again at 0 ° C because the bimetal (BM) is connected to the lead wire 214a and the heating line 212a while the circular restoration. Of course, if the bimetal (BM) is to be circularly restored while the sump 150 is cooled from about 1 ° C to 0 ° C image, it is obvious that the material of the bimetal (BM) should be designed accordingly.

On the other hand, the heating line (212a) generates heat again so that the sump 150 is heated to about 1 ° C as the power is supplied through the circular restored bimetal (BM). As such, since the heating wire 212a is intermittently operated (heated) by the bimetal BM, the water collecting tank 150 maintains a constant temperature of about 1 ° C of the image.

On the other hand, Figure 6 is a block diagram showing a second embodiment of the sump heater shown in Figure 5, Figure 7 is a side cross-sectional view showing the configuration of the sump heater shown in FIG.

Referring to FIG. 6, the sump heater of the natural convection cooling device for a low temperature warehouse according to the second embodiment includes: a heating pipe 212 filled with an insulating material and having a heating line 212a built therein; A power supply unit 214 for applying a rated power to the heating pipe 212; A temperature sensor 216 for sensing a temperature of the heating pipe 212; It includes; the switching unit 218b for controlling the operation of the power supply unit 214 described above.

Referring to FIG. 7, the temperature sensor 216 is integrally mounted to the heating line 212a of the heating pipe 212 to detect the temperature of the heating line 212a as enlarged. That is, the temperature sensor 216 senses the temperature of the heating pipe 212 by the heating wire 212a. At this time, the temperature sensor 216 is preferably composed of, for example, a thermoelectric element that reacts to heat. The temperature sensor 216 is preferably composed of a thermistor (Thermistor) excellent in response characteristics compared to the low price. The temperature sensor 216 is connected to the above-described switching unit 218b by a sensor line 216a as shown.

The switching unit 218b is preferably provided inside the power supply unit 214, that is, inside the case of the power supply unit 214. The switching unit 218b controls the operation of the power supply unit 214 by turning on / off the power supply unit 214 according to the temperature reduction signal applied from the sensor line 216a of the temperature sensor 216.

For example, the switching unit 218b turns on the power supply unit 214 when a temperature reduction signal between 1 ° C and 5 ° C of the heating pipe 212 is applied from the temperature sensor 216, for example. When the temperature reduction signal of less than 1 ° C. of the image is applied, the power supply unit 214 may be configured to be turned off.

The operation of the sump heater according to the second embodiment of the present invention configured as described above will be described below with reference to FIGS. 6 and 7. In the description, the switching unit 218b includes the sump tank 150 having an image of 1 °. For example, the on / off switching operation at the temperature of the image 0 ° C and 1 ° C, respectively, to maintain the temperature of C degree.

6 and 7, the power supply unit 214 is turned on by a power switch not shown. The power supply unit 214 converts an external power source into a rated power supply of the heating pipe 212 and applies it to the heating line 212a of the heating pipe 212. Therefore, the heating line 212a heats the heating pipe 212 while generating heat. The heating pipe 212 heats the water collecting tank 150 by the heating wire 212a.

As the exothermic pipe 212 is heated, the sump 150 cooled by the cold air of the evaporator 130 is gradually heated. At this time, the heating pipe 212 is not immediately changed to the temperature of the image 1 ° C by the cold air of the water collecting tank 150 is gradually raised to the temperature of the image 1 ° C. Of course, the heating line 212a is gradually heated to a temperature of 1 ° C by the heating pipe 212 having a temperature substantially the same as the sump tank 150.

The temperature sensor 216 applies a resistance signal corresponding to the temperature of the heating line 212a to the switching unit 218b through the sensor line 216a. Therefore, the switching unit 218b turns off the power supply unit 214 when the resistance signal applied from the temperature sensor 216 corresponds to a temperature of 1 ° C of the image. Of course, the above-described resistance signal is a temperature-sensitive signal measured the temperature of the heating line (212a).

As the power supply unit 214 is turned off, the heating pipe 212 no longer heats the sump 150. At this time, the temperature of the sump tank 150 is heated to about 1 ° C by the heating line 212a. Thus, the sump 150 prevents freezing of the collected condensate.

The heating line 212a is cooled together with the sump 150 by the evaporator 1302 and the cold air in the low temperature warehouse as the power supply unit 214 is turned off. At this time, the temperature sensor 216 is cooled together with the heating wire 212a. When the heating line 212a becomes the image 1 ° C, the temperature sensor 216 applies a temperature reduction signal corresponding to 1 ° C to the switching unit 218b. Accordingly, the switching unit 218b turns the power supply unit 214 back on to reactivate the heating pipe 212. Therefore, the heating line 212a generates heat again so that the sump tank 150 is heated to about 1 ° C of the image.

Thus, since the heating line 212a is intermittently operated by the switching unit 218b, the sump tank 150 maintains a constant temperature of about 1 ° C of the image.

On the other hand, the sump heater according to the second embodiment can be configured by integrally mounting the above-described temperature sensor 216 to the outer peripheral surface of the heating pipe 212, as shown by the broken line in FIG. When the temperature sensor 216 is mounted on the heating pipe 212, the temperature sensor 216 senses the temperature of the heating pipe 212 instead of the heating wire 212a to reduce the temperature of the switching unit 218b. Apply a signal. Therefore, the switching unit 218b operates according to the temperature of the heating pipe 212. That is, the temperature sensor 216 may be embedded in the heating pipe 212 as shown by the solid line in FIG. 7, and may be mounted on the surface of the heating pipe 212 as shown by the broken line.

On the other hand, Figure 8 is a block diagram showing a third embodiment of the sump heater shown in Fig. 5, the sump heater according to the third embodiment is a comparison unit 218a in the configuration of the above-described second embodiment as shown ) Is different from the second embodiment.

In the sump heater according to the third embodiment, the comparison unit 218a compares the temperature reduction signal applied by the temperature sensor 216 integrally mounted on the outer circumferential surface of the heating pipe 212 or the heating line 212a. The difference is that you have configured 218b) to work.

At this time, the comparison unit 218a applies an ON signal to the switching unit 218b when a temperature reduction signal of 0 ° C is applied, for example, from the temperature sensor 216, and a temperature reduction of images 1 ° C to 5 ° C. When a signal is applied, the switching unit 218b may be configured to apply an OFF signal.

Referring to the operation of the sump heater according to the third embodiment configured as described above, the comparison unit 218a is 0 from the temperature sensor 216 so that the sump tank 150 maintains the image 1 ° C As an example, it is configured to operate when a temperature-sensitive signal of ° C and image 1 ° C is applied.

In order to operate the sump heater according to the third embodiment, the power switch 214 is turned on by operating a power switch not shown. Accordingly, the power supply unit 214 applies external power to the heating pipe 212. Therefore, the heating pipe 212 heats the water collecting tank 150 while being heated.

The temperature sensor 216 measures the temperature of the heating pipe 212 and applies the measured temperature signal to the comparator 218a. The comparison unit 218a stops the operation of the power supply unit 214 when a temperature reduction signal of image 1 ° C is applied from the temperature sensor 216. Therefore, the heating pipe 212 is stopped heat generation. At this time, the sump 150 is heated to a temperature of about 1 ° C image.

The comparison unit 218a operates the power supply unit 214 again when the heating pipe 212 is cooled together with the water collecting tank 150 so that a 0 ° C. temperature reduction signal is transmitted from the temperature sensor 216. Therefore, the heating pipe 212 generates heat again so that the sump tank 150 is heated to about 1 ° C. Thus, since the heating pipe 212 is intermittently operated by the switching unit 218b operated by the comparator 218a, the water collecting tank 150 maintains a constant temperature of about 1 ° C image.

On the other hand, the temperature sensor 216 disclosed in the above-described second and third embodiments can be applied to other components that exhibit a function similar to that of the thermoelectric element other than the aforementioned thermoelectric element. That is, the above-described temperature sensor 216 is not limited to a thermoelectric element. In addition, the temperature reduction signal of the temperature sensor 216 is not limited to the above-described 0 ° C and 1 ° C to 5 ° C. That is, the temperature reduction signal of the temperature sensor 216 may apply various temperatures as necessary.

In the drawings, reference numeral 132 denotes a refrigerant pipe, 134 a support frame, 139 an end plate, 142 an exothermic pipe for defrosting the evaporator 130, 144 a power supply unit for supplying power to the exothermic pipe 142, 152 is a heat insulating material, 154 is a drain pipe, 162 is a connecting member 162 to allow the passage of the bolt B fastened to the nut N, and 164 is a through hole through which the connecting member 162 is fixed.

The above embodiment is merely a description of the preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed as appropriate within the scope of the same idea. Therefore, the shape and structure of each component shown in the embodiment of the present invention can be carried out by modifying, it is natural that the modification of the shape and structure belong to the appended claims of the present invention.

The collection tank heater of the natural convection cooling device for low temperature warehouse according to the present invention as described above, since the temperature sensor is installed in the heating pipe having a temperature substantially the same as the collection tank, the convenience of installation convenience improvement does not have to consider the wiring of the heating pipe. In addition, since the temperature sensor is integrally mounted to the sump heater without being separate from the sump heater, the work process can be simplified, thereby improving the manufacturing efficiency of the cooling apparatus.

In addition, since the power supply control means stops or restarts the operation of the sump heater while controlling the power according to the temperature of the sump heater, there is an effect that it is not necessary to install an overheat protector to prevent overheating of the sump heater.

In addition, when the power supply control means is composed of a bimetal and a housing, since the bimetal switches, there is an effect of not having to separately provide a switch for controlling the operation of the sump heater.

Claims (8)

delete The collection tank 150 of the low temperature warehouse natural convection cooling device installed inside the low temperature warehouse, supplying the cold air of the evaporator 130 directly connected to the lower portion of the collection tank 150 for collecting condensate water in a low temperature warehouse. In the collection tank heater of the cold storage natural convection cooling device for preventing the condensate collected in the collection tank 150 to freeze, A heat generating pipe 212 integrally wired to the water collecting tank 150 so that the temperature of the water collecting tank 150 is transferred, and generates heat by the built-in heating wire 212a; A power supply unit 214 for applying power of a rated voltage to the heating line 212a of the heating pipe 212; And Power of the power supply unit 214 applied to the heating line 212a according to the temperature of the heating pipe 212 having a temperature substantially the same as the temperature of the collecting tank 150 as the temperature of the collecting tank 150 is transferred. It includes; power control means for controlling the; The power control means, Interposed integrally between the power supply unit 214 and the heating line 212a of the heating pipe 212, the energization state of the power supply unit 214 and the heating line 212a is variable according to the temperature of the heating pipe 212. Bimetal (BM) for switching operation while intermittently controlled; And The housing (H) for protecting the bimetal (BM) to enable the operation of the bimetal (BM); the sump heater of the cold storage natural convection type cooling apparatus comprising a. The method of claim 2, wherein the bimetal (BM), Cold convection for cold storage, characterized in that the heating line 212a of the heating pipe 212 is configured to disconnect the power supply unit 214 and the heating line 212a while refracting deformation when heated to the image 1 ° C to 5 ° C Cistern heater of type air conditioner. The collection tank 150 of the low temperature warehouse natural convection cooling device installed inside the low temperature warehouse, supplying the cold air of the evaporator 130 directly connected to the lower portion of the collection tank 150 for collecting condensate water in a low temperature warehouse. In the collection tank heater of the cold storage natural convection cooling device for preventing the condensate collected in the collection tank 150 to freeze, A heat generating pipe 212 integrally wired to the water collecting tank 150 so that the temperature of the water collecting tank 150 is transferred, and generates heat by the built-in heating wire 212a; A power supply unit 214 for applying power of a rated voltage to the heating line 212a of the heating pipe 212; And Power of the power supply unit 214 applied to the heating line 212a according to the temperature of the heating pipe 212 having a temperature substantially the same as the temperature of the collecting tank 150 as the temperature of the collecting tank 150 is transferred. It includes; power control means for controlling the; The power control means, A temperature sensor 216 integrally installed in the heating pipe 212 for sensing a temperature of the heating pipe 212; And The switching unit 218b for turning on / off the power supply unit 214 according to the temperature reduction signal applied from the temperature sensor 216, the natural convection cooling device for cold storage, comprising a Sump heater. The method of claim 4, wherein the switching unit 218b, When the temperature sensor corresponding to 0 ° C. is applied from the temperature sensor 216, the power supply unit 214 is turned on. When the temperature signal of images 1 ° C. to 5 ° C. is applied, the power supply unit 214 is turned on. A water tank heater of a natural convection cooling device for a low temperature warehouse, characterized in that it is turned off. The collection tank 150 of the low temperature warehouse natural convection cooling device installed inside the low temperature warehouse, supplying the cold air of the evaporator 130 directly connected to the lower portion of the collection tank 150 for collecting condensate water in a low temperature warehouse. In the collection tank heater of the cold storage natural convection cooling device for preventing the condensate collected in the collection tank 150 to freeze, A heat generating pipe 212 integrally wired to the water collecting tank 150 so that the temperature of the water collecting tank 150 is transferred, and generates heat by the built-in heating wire 212a; A power supply unit 214 for applying power of a rated voltage to the heating line 212a of the heating pipe 212; And Power of the power supply unit 214 applied to the heating line 212a according to the temperature of the heating pipe 212 having a temperature substantially the same as the temperature of the collecting tank 150 as the temperature of the collecting tank 150 is transferred. It includes; power control means for controlling the; The power control means, A temperature sensor 216 integrally installed in the heating pipe 212 for sensing a temperature of the heating pipe 212; A comparison unit 218a for comparing the temperature reduction signal applied from the temperature sensor 216 with a set temperature; And And a switching unit 218b for turning on / off the power supply unit 214 according to the signal applied from the comparison unit 218a. heater. The method of claim 6, wherein the comparison unit 218b, When a temperature reduction signal of 0 ° C is applied from the temperature sensor 216, an ON signal is applied to the switching unit 218b, and when a temperature reduction signal of images 1 ° C to 5 ° C is applied, the switching unit ( A collection basin heater of a natural convection cooling device for a low temperature warehouse, characterized by applying an OFF signal to 218b). The method of claim 4 or 6, wherein the temperature sensor 216, Collecting heater of the cold storage natural convection-type cooling device for a low-temperature warehouse, characterized in that;

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