WO2011139011A1

WO2011139011A1 - Defrosting device for the natural-convection evaporator of a low-temperature store

Info

Publication number: WO2011139011A1
Application number: PCT/KR2010/008426
Authority: WO
Inventors: 박광균
Original assignee: 주식회사 제일화인테크
Priority date: 2010-05-04
Filing date: 2010-11-26
Publication date: 2011-11-10
Also published as: KR100973070B1

Abstract

The present invention relates to a defrosting device for the natural-convection evaporator of a low-temperature store. To this end, the natural-convection evaporator of a low-temperature store consists of an evaporator which has a cooling pipe for receiving a supply of coolant from external equipment and has a supporting frame for supporting the cooling pipe and which provides cooling air to a low-temperature store by throttling the coolant supplied to the cooling pipe, and consists of a water collecting tank which is coupled to the evaporator and collects condensed water, a heat-emitting pipe which is installed in the evaporator and ensures a high temperature while emitting heat, and a power source unit which supplies the heat-emitting pipe with a power source, and this natural-convection evaporator comprises: an electrode sensor in which a first electrode plate and a second electrode plate are disposed in a short-circuited state with a spacing interval in between so as to be able to detect frost building up on the cooling pipe of the evaporator; a photosensor which detects whether there is any frost by means of changes in the amount of light received when light emitted from a light-emitting unit is reflected on the surface of the cooling pipe provided in the evaporator and falls incident on a light-receiving unit; and a control unit which removes the frost that has built up on the cooling pipe by judging whether to apply a current to the heat-emitting pipe upon detecting both a current in the electrode sensor and a change in the amount of light received in the photosensor.

Description

Defrosting device of natural convection evaporator for low temperature warehouse

The present invention is to remove the freezing of the natural convection evaporator for cold storage configured to increase the cooling efficiency in the warehouse by preventing the over-cooling of the evaporator which is exposed to the interior of the warehouse to supply cold air in natural convection in real time The apparatus relates to a device, and more particularly, when frost is accumulated on the surface of the cooling pipe coupled to the evaporator, the received light amount is changed by the energization signal of the electrode sensor energized by the accumulated frost and frost accumulated on the surface of the cooling pipe. By determining whether the heating pipe that heats the cooling pipe is operated together with the detection signal of the photosensor to sense, it is possible to minimize the power consumption due to the prevention of the malfunction of the heating pipe and to superheat the evaporator in real time. The present invention relates to an ice freezing device for a natural convection evaporator for a low temperature warehouse.

In general, the applicant of the present invention is a natural convection cooling device for low temperature warehouse supplying cold air in a natural convection type (utility model registration application: 2004-25038, dual patent application: 2005-32448, patent Application No. 2005-74783) has been filed and registered.

Attached Figure 1 is a block diagram of a conventional cold storage natural convection type cooling apparatus, Figure 2 is a view showing an evaporator extracted from FIG.

As shown in FIG. 1 and FIG. 2, the air conditioner 200 according to the related art includes an outdoor unit 200a installed outside the warehouse, a cooling pipe 210 supplied with a refrigerant from the outdoor unit 200a, and It has a support frame 220 for supporting the cooling pipe 210, the evaporator 200b for condensing the refrigerant supplied to the cooling pipe 210 to provide cold air to the warehouse, and the condensate generated from the evaporator (200b) It consists of a water collecting tank (250) for collecting water.

At this time, the evaporator 200b is a heating pipe 230 for providing a high heat to prevent over-cooling of the cooling pipe 210 and a power supply 240 for supplying power to the heating pipe 230. It includes more.

The air conditioner 200 exposes the evaporator 200b to the inside of the warehouse, and circulates in a natural convection type by the temperature difference in the warehouse, thereby cooling the warehouse.

Here, the evaporator 200b is defrosted (defrosted) by the heating pipe 230 which generates heat intermittently for a time set by the power supply unit 240.

In another example, only the operating time of the evaporator 200b is counted for the time set by the power supply 240 intermittently during the time that the evaporator 200b is operated, that is, the idle time when the evaporator 200b is not operated. The frost may be defrosted by the heating pipe 230 that generates heat.

For example, when the heating pipe 230 is set to be operated for 5 minutes every 4 hours, the evaporator 200b is not operated at all times because the evaporator 200b is operated according to the set temperature inside the warehouse. Therefore, the heating pipe 230 is operated for 5 minutes to perform the defrosting operation when the set time is counted and accumulated only the operating time excluding the rest time by the internal temperature of the warehouse.

However, since the above configurations perform defrosting according to the set time irrespective of the supercooling (freezing) state of the evaporator 200b, even if frost is excessively dropped on the cooling pipe 210, it cannot be defrosted in time, and power consumption is also reduced. There are also a lot of problems.

If the frost is not defrosted in time, the heating pipe operating for a certain time cannot remove all of the frost excessively accumulated in the cooling pipe.

Therefore, a large amount of frost is left in the evaporator as it is, the problem of lowering the cooling efficiency of the air conditioner.

The present invention has been made in view of the above problems, and the first object of the present invention is to cool the frost on the surface of the cooling pipe of the evaporator so that the cooling efficiency due to overcooling can be prevented from being lowered. The present invention provides a defrosting device for a natural convection evaporator for a low temperature warehouse that can detect and remove frost accumulated on the surface of a pipe in real time.

It is a second object of the present invention to provide a defrosting apparatus for a natural convection evaporator for a low temperature warehouse, which can control whether or not defrosting is performed according to the amount of frost accumulated on the surface of the cooling pipe.

The third object of the present invention, when frost is accumulated on the surface of the cooling pipe coupled to the evaporator, detects the amount of light received by the energization signal of the electrode sensor that is energized by the accumulated frost and frost accumulated on the surface of the cooling pipe. By determining whether the heating pipe is operated together with the detection signal of the photosensor, the frost accumulated on the surface of the refrigerant pipe can be completely removed, and the power consumption due to the malfunction of the heating pipe can be minimized. An object of the present invention is to provide a defrosting device for a natural convection evaporator for a low temperature warehouse that can prevent overcooling in real time.

According to a feature of the present invention for achieving the above object, the first invention relates to a device for removing ice from a natural convection evaporator for a low temperature warehouse, and supports a cooling pipe and a cooling pipe supplied with a refrigerant from an outdoor unit. An evaporator for condensing the refrigerant supplied to the cooling pipe to provide cold air to a low temperature warehouse, a sump tank coupled to the evaporator to collect condensed water, and an exothermic pipe installed in the evaporator to provide high heat while generating heat. In the low temperature warehouse natural convection type air conditioner comprising a power supply unit for supplying power to the heating pipe, the first electrode plate and the second electrode plate spaced apart from each other to detect frost accumulated on the cooling pipe of the evaporator An electrode sensor disposed in a short-circuit state with a gap between the cooling pipes and the light emitted from the light emitting unit; A photo sensor which detects the presence or absence of frost by a change in the amount of received light when the surface is reflected and incident to the light receiving portion; And a controller configured to remove frost accumulated on the cooling pipe by determining whether the current for the heating pipe is applied when the energization of the electrode sensor and the change in the amount of received light of the photosensor are sensed together.

The second invention, in the first invention, the electrode sensor is characterized in that it further comprises a gap adjusting means to control whether or not the electricity supply according to the amount of frost.

According to a third aspect of the present invention, in the second invention, the gap adjusting means includes a linear motor including a linear guide and a slider which is moved along the linear guide, and the slider of the linear motor is coupled to the second electrode plate. The second electrode plate is configured to be elevated relative to the first electrode plate.

The fourth invention, in the second invention, the gap adjusting means is composed of a servo motor and a ball screw coupled to the servo motor, the ball screw is screw-coupled with the second electrode plate to the second electrode plate It is characterized in that the electrode plate is configured to be elevated.

According to the freezing removal device of the natural convection evaporator for low temperature warehouse according to the present invention, it is possible to adjust the defrosting according to the thickness of the frost accumulated on the cooling pipe has the effect of more efficient defrosting work.

In addition, even if foreign matter is inserted into the electrode sensor and is energized, by determining whether the heating pipe is operated together with the detection signal of the photosensor, the frost accumulated on the surface of the refrigerant pipe is completely removed, and the heating pipe is prevented from malfunctioning. In addition to minimizing the power consumption, there is a feature that can prevent the overcooling of the evaporator in real time.

On the contrary, even if frost is detected on the surface of the cooling pipe through the photosensor, if the electrode sensor is not energized, it is determined that the amount of frost is less than the reference value, so that the heating pipe is not operated, thereby minimizing power consumption.

1 is a configuration diagram of a conventional low-temperature warehouse natural convection type air conditioner,

2 is a block diagram showing an evaporator extracted from FIG.

Figure 3 is a block diagram of a device for removing ice in a natural convection evaporator for a cold store according to the present invention,

4 is a configuration diagram showing the installation state of the electrode sensor and the photosensor of the present invention in the evaporator,

5 is a conceptual diagram of installation of an electrode sensor according to another embodiment of the present invention;

6 is a conceptual diagram showing an operating state of the photosensor of the present invention,

Figure 7 is a flow chart of the ice removal device of the natural convection evaporator for cold storage according to the present invention.

Prior to explaining the present invention, as shown in Figures 1 and 2, the conventional natural convection cooling device 200 to expose the evaporator 200b to the interior of the warehouse to supply cold air in a natural convection type To this end, the outdoor unit (200a) for condensing and compressing the refrigerant installed in the outside of the warehouse for supplying, the cooling pipe 210 receives the refrigerant from the outdoor unit (200a) and the support frame for supporting the cooling pipe 210 An evaporator 200b having a 220 and condensing the refrigerant supplied to the cooling pipe 210 to provide cold air to the low temperature warehouse, and an exothermic pipe 230 installed in the evaporator 200b to provide high heat while generating heat. And a power supply unit 240 for supplying power to the heating pipe 230.

Here, the divergence of the cold air of the evaporator 200b emits cold air through the refrigerant pipe 210 and the cooling fins 211 attached to the refrigerant pipe.

The natural convection cooling device 200 is a device for supplying cold air to the interior of the warehouse by the natural convection method by the temperature difference by exposing the evaporator (200b) to the interior of the warehouse.

Hereinafter, with reference to the accompanying drawings with respect to the ice removal device of the natural convection evaporator for low temperature warehouse according to the present invention will be described in detail.

Figure 3 is a block diagram of the ice removal device of the natural convection evaporator for low temperature warehouse according to the present invention, Figure 4 is a block diagram showing the installation state of the electrode sensor and the photo sensor of the present invention in the evaporator, Figure 5 6 is a conceptual diagram illustrating an installation of an electrode sensor according to another exemplary embodiment of the present invention, and FIG. 6 is a conceptual diagram illustrating an operating state of a photosensor of the present invention.

As shown in FIGS. 3 to 6, the present invention has accumulated frost on the surface of the cooling pipe 210 of the evaporator 200b so that the cooling efficiency can be prevented from being lowered due to overcooling. The present invention relates to a defrosting device 100 for a natural convection evaporator for a low temperature warehouse configured to detect frost and remove frost through a heating pipe.

The freezing device 100 of the natural convection evaporator for the cold store is largely composed of three parts, which includes an electrode sensor 110, a photo sensor 130, and a controller 140.

Here, the electrode sensor 110 is short-circuited with the first electrode plate 111 and the second electrode plate 112 spaced apart from each other to detect frost accumulated on the surface of the cooling pipe 210 by energization. Are placed in a state.

In the electrode sensor 110 having the above-described structure, frost is filled in the space between the first electrode plate 111 and the second electrode plate 112 to form the first electrode plate 111 and the second electrode plate 112. When electricity is supplied through, it will be configured to detect the super-cooled cooling pipe (210).

In this case, the first electrode plate 111 may be configured to be grounded to the cooling pipe 210, and the second electrode plate 112 may be configured to be connected to a separate power source or a power source 240 to supply power. can do.

In addition, the electrode sensor 110 may further include a gap adjusting means 120 to control whether or not the current is supplied in accordance with the amount of frost accumulated on the surface of the cooling pipe (210).

Here, the interval adjusting means 120 is for arbitrarily adjusting the amount of frost accumulated on the surface of the cooling pipe 210 according to the size of the scale of the evaporator (200b). This is because the diameter of the cooling pipe 210 also varies according to the size of the evaporator (200b), to arbitrarily adjust the operation of the heating pipe 210 according to the appropriate amount to increase the power efficiency.

To this end, the gap adjusting means 120 may be formed of a linear motor including a linear guide 121a and a slider 121b that is transported along the linear guide 121a to enable precise control.

In this case, the linear motor combines the slider 121b transferred along the linear guide 121a with the second electrode plate 112 so that the second electrode plate 112 can be lifted with respect to the first electrode plate 111. One configuration. In the above, the linear guide 121a may be fixed to the cooling fin 211 by attaching to the cooling fin 211 in one embodiment, and fixed to the bottom of the sump tank 250 in another embodiment.

In this configuration, the distance from the first electrode plate 111 can be adjusted through the second electrode plate 112 that moves up and down the separation space. As a result, the heating pipe is operated according to the amount of frost filled in the separation space. It can be adjusted arbitrarily.

On the other hand, as shown in Figure 5 (A), the electrode sensor 110 may be composed of a single first electrode plate 111 is disposed in a short circuit with the surface of the cooling pipe 210. In this case, the first electrode plate 111 may be coupled to the slider 121b of the linear motor to be elevated on the surface of the cooling pipe 210.

In addition, the interval adjusting means 120 may be composed of a servo motor 122, a ball screw 122a coupled to the servo motor 122, as shown in FIG. At this time, the ball screw 122a is configured to be screw-coupled with the second electrode plate 112 so that the second electrode plate 112 can be elevated along the ball screw 122a with respect to the first electrode plate 111. The servo motor 122 may be fixed to the bracket 123 coupled to the cooling fin 211. The above structure is configured to precisely control the rotation RPM along with the forward / reverse rotation of the servomotor 122, and as a result, can automatically adjust the amount of frost.

On the other hand, as shown in Figure 5 (C), the electrode sensor 110 may be composed of a single first electrode plate 111 is disposed in a short circuit with the surface of the cooling pipe 210. In this case, the first electrode plate 111 may be screw-coupled to the ball screw 122a coupled to the servomotor 122 so that the first electrode plate 111 may be elevated on the surface of the cooling pipe 210.

In addition, as shown in Figure 5 (D), the gap adjusting means 120 may be composed of only the ball screw (122a) is coupled to the bearing 124a to the support rod 124 fixed to the cooling fins. The above structure rotates the ball screw 122a with a tool such as a screwdriver so that the second electrode plate 112 screwed to the ball screw 122a is lifted, resulting in the first electrode plate 111 and the second electrode. The spacing of the separation spaces formed between the plates 112 can be adjusted to manually adjust the amount of frost.

In addition, as shown in (E) of FIG. 5, when the electrode sensor 110 is composed of a single first electrode plate 111 disposed in a short circuit with the surface of the cooling pipe 210, the first electrode plate 111 may be configured to be screwed to the ball screw 122a to be elevated on the surface of the cooling pipe 210.

On the other hand, the photosensor 130 may be fixed by inserting in the space between the cooling fin 211 and the cooling fin 211, the first electrode plate 111 and the second electrode plate 112 of the electrode sensor 110 When the foreign matter is inserted into the separation space is energized, to prevent the misjudgment of the control unit 140, as shown in Figure 6, the light emitted from the light emitting unit 131 is provided with a cooling pipe (evaporator 200b) When reflecting the surface of the 210 is incident to the light receiving unit 130, it detects the presence of frost by the change in the amount of light received. The photosensor 130 may be configured to be electrically connected to the power supply 240 or a separate power or electrode sensor 110.

The controller 140 determines whether the current is applied to the heating pipe 230 when the energization of the electrode sensor 110 and the amount of change in the amount of received light of the photosensor 130 are sensed together, and is then stored in the cooling pipe 210. Functions to remove frost.

Hereinafter, the operation of the deicing device of the natural convection evaporator for low temperature warehouse according to the present invention will be briefly described with reference to the accompanying drawings.

As shown in FIG. 7, when frost is accumulated on the surface of the cooling pipe, the photosensor first detects the presence of frost accumulated on the surface of the cooling pipe.

Thereafter, when the frost is filled and energized in the space between the first electrode plate and the second electrode plate of the electrode sensor, the energization signal is output to the controller.

At this time, the control unit receives an energization signal according to the energization of the electrode sensor, and if the change detection signal of the photo sensor is not input, it is determined that the electrode sensor is energized by the foreign matter to determine whether the current to the heating pipe. It will not generate an acceptable output signal.

On the contrary, when the sensing signal of the photosensor is input to the controller and the energization signal of the electrode sensor is not input, the output signal for approving the application of the current to the heating pipe is determined by determining that the accumulated amount of frost accumulated in the cooling pipe is lower than the reference value. It does not occur.

That is, when the control signal is input together with the energization signal according to the energization of the electrode sensor and the detection signal according to the change in the amount of light received by the photosensor, the frost is accumulated on the surface of the cooling pipe above the reference value, that is, overcooled. It is determined that the state is to provide an output signal for approving the application of the heating pipe current.

After that, the heating pipe is operated to remove frost accumulated on the cooling pipe. (S300)

When the frost is removed as the heating pipe is operated, the electrode sensor is not energized.

However, in the photosensor, since the change in the amount of received light continues to be input as a detection signal due to the frost remaining on the surface of the heating pipe, the controller determines that the frost is not completely removed and continues the output signal for approving the application of current to the heating pipe. To provide.

After that, if the detection signal according to the change in the amount of light received by the photosensor is not input, the controller determines that the frost is completely removed from the surface of the cooling pipe and does not generate an output signal for approving the application of the current to the heating pipe. (S500)

Then the operation of the heating pipe is stopped (S600) and ends.

On the other hand, when the frost accumulated on the cooling pipe is removed by the operation of the heating pipe, the control unit may stop the operation of the heating pipe only by the energization of the electrode sensor, which is preferable because the remaining frost, that is, the frost is not completely removed. Not.

As a result, the present invention compares the light receiving amount changed by the frost accumulated on the surface of the cooling pipe, as well as whether the electrode sensor is energized by the frost accumulated on the surface of the cooling pipe, and thereby generates heat generated by heating the cooling pipe. By determining whether the pipe is operating, power consumption due to malfunction of the heating pipe can be minimized, and supercooling can be prevented in real time.

As described above, the ice removing device 100 of the natural convection evaporator for a low temperature warehouse according to the present invention may be installed in the water collecting tank 250 to prevent freezing of the water collecting tank 250.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

Claims

It has a cooling pipe 210 to receive the refrigerant from the outdoor unit (200a) and a support frame 220 for supporting the cooling pipe 210, by condensing the refrigerant supplied to the cooling pipe 210 to provide cold air to the cold store An evaporator (200b), a water collecting tank (250) coupled to the evaporator (200b) to collect condensed water, and a heating pipe (230) installed in the evaporator (200b) to provide high heat while generating heat, and the heating pipe (230). In the low temperature warehouse natural convection type evaporator consisting of a power supply 240 for supplying power,

An electrode sensor in which the first electrode plate 111 and the second electrode plate 112 are short-circuited to be spaced apart from each other so as to sense frost accumulated on the cooling pipe 210 of the evaporator 200b. 110;

When the light emitted from the light emitting unit 131 is incident on the light receiving unit 132 by reflecting the surface of the cooling pipe 210 provided in the evaporator (200b), the photosensor for detecting the presence of frost by the change in the amount of received light ( 130); And

Control unit for removing the frost accumulated on the cooling pipe 210 by determining whether the current to the heating pipe 230 is applied when the energization of the electrode sensor 110 and the change in the amount of received light of the photosensor 130 is sensed together. Ice removal device of the natural convection evaporator for low-temperature warehouse, comprising: (140).
The method of claim 1,

The electrode sensor 110, the freezing device of the natural convection evaporator for cold storage, characterized in that it further comprises a gap adjusting means 120 to control whether or not energization according to the appropriate amount of frost.
The method of claim 2,

The gap adjusting means 120 is composed of a linear motor consisting of a linear guide 121a and a slider 121b conveyed along the linear guide 121a,

The slider 121b of the linear motor is coupled to the second electrode plate 112 so that the second electrode plate 112 can be lifted with respect to the first electrode plate 111. Freezing device for natural convection evaporator.
The method of claim 2,

The gap adjusting means 120 is composed of a servo motor 122, a ball screw 122a coupled to the servo motor 122,

The ball screw 122a is screw-coupled with the second electrode plate 112 so that the second electrode plate 112 can be raised and lowered relative to the first electrode plate 111. Defrosting device of the type evaporator.