KR100620024B1 - Cabinet heating apparatus in refrigerator cabinet forming system and a heating method thereby - Google Patents

Abstract

The present invention relates to a cabinet heating apparatus and a heating method of a foam molding system of a refrigerator cabinet, including a heating element formed by a hot wire on a contact surface of a refrigerator cabinet installed to form a heat insulation in the foam molding system of a refrigerator cabinet, By heating the refrigerator cabinet by conducting heat transfer that directly transfers heat to the refrigerator cabinet, it is possible to minimize the heat loss generated in the heating process, and to install a temperature sensor to detect the temperature of the refrigerator cabinet, By feedback control. Provided is a cabinet heating apparatus and heating method for a foam molding system of a refrigerator cabinet capable of precise temperature control within a set temperature range suitable for foaming.

Refrigerator cabinet, foam, heating wire, temperature sensor, conduction heat transfer

Description

Cabinet heating device and heating method of foam molding system of refrigerator cabinet {CABINET HEATING APPARATUS IN REFRIGERATOR CABINET FORMING SYSTEM AND A HEATING METHOD THEREBY}

1 is a perspective view showing the configuration of a foam molding system of a refrigerator cabinet

Figure 2 is a process flow diagram of the foam molding system of the refrigerator cabinet of Figure 1

3 is a schematic view showing a heating state of a foam molding system of a conventional refrigerator cabinet;

4 to 7 relates to a heating apparatus of a foam molding system of a refrigerator cabinet according to an embodiment of the present invention,

4 is a perspective view showing the configuration of a foam molding system of a refrigerator cabinet;

FIG. 5 is a perspective view of the core of FIG. 4; FIG.

6 is a schematic view showing a heated state of the foam molding system of FIG.

7 is a control flowchart of the feedback control of FIG.

** Description of symbols for the main parts of the drawing **

1: foam molding system of the refrigerator cabinet 10: base plate

20: support 21: front support plate

22: rear support plate 23: right support plate

24: seat support plate 25: top support plate

26: bottom support plate 30: core part

31: freezer compartment core 32: refrigerator compartment core

40: blower 110: power supply line

120: support portion heating wire 130: core portion heating wire

200: Temperature sensor To: set upper limit temperature

To ': Set lower limit temperature T1: Detected temperature

The present invention relates to a cabinet heating apparatus and a heating method of a foam molding system of a refrigerator cabinet, and more particularly, to minimize heat loss generated in a heating process to form a heat insulating part of a refrigerator cabinet, and to precise temperature control within a set temperature range. The present invention relates to a cabinet heating apparatus and a heating method of a foam molding system of a refrigerator cabinet.

The refrigerator is for storing food at low temperature, and includes a cabinet for forming a storage space such as a refrigerator compartment or a freezer compartment for storing food, a door for opening and closing the refrigerator compartment and the freezer compartment, and a machine for keeping the stored food at a low temperature state. It consists of wealth.

Here, the cabinet is filled with a heat insulating material between the outer surface forming the outer shape and the inner surface forming the storage space to increase the cold effect. In recent years, light and excellent insulation polyurethane is used as a material of the heat insulating material, the polyurethane foam liquid is injected between the inner surface and the outer surface of the cabinet in the assembled state by heating and foaming to fill the insulation inside the cabinet.

Figure 1 is a perspective view showing the configuration of the foam molding system of the refrigerator cabinet, Figure 2 is a process flow chart of the foam molding system of the refrigerator cabinet of Figure 1, Figure 3 is a schematic diagram showing a heating state of the foam molding system of a conventional refrigerator cabinet. to be.

As shown in the drawings, the conventional foam molding system 1 of the refrigerator cabinet, the base plate 10 for supporting the entire load, and the top, bottom, left, right, front, Cooling to prevent the core portion 30 and the core portion 30 formed of ABS resin in the shape of the inner surface of the cabinet and the core portion 30 formed to seal the back and withstand a predetermined pressure. It is configured to include a blower 40 for blowing air.

The base plate 10 has a reinforcement 13 formed between the upper plate 11 and the lower plate 12 and the upper plate 11 and the lower plate 12 so as to support most supports of the foam molding system 1 of the refrigerator cabinet. ) And the fork insertion hole 14 between the reinforcing material 13 into which the fork of the forklift truck is inserted so as to easily transport the foam molding system 1 of the refrigerator cabinet to the forklift, and the support portion 20 to the hinge mechanism 15a. It is provided with a plurality of hinges 15 formed on the top plate 11 to rotate and open and close.

The support part 20 is formed to seal the refrigerator cabinet so as to withstand the pressure that the foaming liquid is foamed in a state in which the refrigerator cabinet is wrapped around the core part 30 and is formed to have sufficient rigidity before, after, left and right support plates 21. 22, 23, 24, the rear support plate 22 and the hinge mechanism 27 is rotatably connected to the upper support plate 25 for opening and closing the upper surface of the cabinet, and formed integrally with the core portion 30 and the bottom It is comprised including the bottom support plate 26 which forms a surface.

Here, the front, rear, left and right support plates (21, 22, 23, 24) is operated to open and fold so that the cabinet can be inserted, out by the hinge portion (15).

The core part 30 has a refrigerator compartment core 31 formed of an aluminum material having excellent thermal conductivity as the inner surface shape of the refrigerating compartment of the cabinet so as to seat the cabinet in the foam molding system 1 of the refrigerator cabinet, and the inner surface shape of the freezer compartment of the cabinet. As provided with a freezer compartment core 32 formed of aluminum, it serves to maintain the shape of the inner surface of the refrigerator cabinet from the foaming pressure generated when the foaming liquid of polyurethane is foamed.

The blower 40 is an external blower duct 41 to prevent the core portion 30 from overheating when the blower 40 is heated by a high temperature blower in the heating oven 50 to foam the foam liquid injected into the cabinet. By blowing cold air through the blower duct 42 from the inside is formed to forcibly radiate the core portion (30).

The foaming process using the foam molding system 1 of the refrigerator cabinet configured as described above is a process in which the foam molding system 1 of the refrigerator cabinet rides the conveyor belt 51 in the direction of the arrow as shown in FIG. The refrigerator cabinet is foamed while passing through the heating zone. In more detail, in the step indicated by the reference numeral P1, the upper support plate 25 is rotated and opened by the hinge portion 27 with respect to the rear support plate 22, and again before, after, left and right support plates 21, 22, 23, 24 are rotated to the hinge portion 15 relative to the base plate 10 to open. Then, the refrigerator cabinet in which the foaming is completed in the refrigerator cabinet by one rotation in the direction of the arrow in FIG. 3 is separated at step P2, and the core part 30 having the foamed cabinet not foamed at step P3 in the shape of its inner surface 30 is formed. ), And close each of the supporting plates (21, 22, 23, 24, 25) again to seal the refrigerator cabinet.

Then, after the foaming liquid is injected through the foaming liquid inlet 25a of the foaming molding system 1 of the refrigerator cabinet, the foaming molding system 1 of the refrigerator cabinet is heated ovens of hatched B and C which are heating regions ( 50) You go inside. As shown in FIG. 3, the refrigerator cabinet 90 in the heating oven 50 is convection by a heater that blows high temperature air of about 95 ° C. ± 15 ° C. at a wind speed of 8 ± 3 m / s. It is heated by the action and at the same time cooled by blowing a cold wind by the blowing fan 40 below the core portion 30, while maintaining the temperature around the refrigerator cabinet 90 to 45 ℃ ± 5 ℃ to maintain the polyurethane foam liquid Foamed foam.

However, in the process of heating the refrigerator cabinet 90 to a predetermined temperature range, since the heating and cooling is performed simultaneously in the heating oven 50, there is a problem that the energy efficiency is lowered, the heating method is due to the convection heat transfer It also had a problem of heat loss.

 The present invention has been made to solve the problems of the prior art as described above, to minimize the heat loss generated in the process of heating to form a foam, which is a thermal insulation of the refrigerator cabinet and put the foam liquid in the refrigerator cabinet, within a set temperature range It is an object of the present invention to provide a cabinet heating apparatus and a heating method of a foam molding system of a refrigerator cabinet capable of precise temperature control.

The present invention provides a foam molding system for a refrigerator cabinet having a support for supporting an outer surface of a cabinet and a core for supporting an inner surface of the cabinet, in order to achieve the object as described above, the cabinet provided in the foam molding system. It provides a cabinet heating apparatus of the foam molding system of the refrigerator, characterized in that comprising a heating element formed on the contact surface of the refrigerator.

This is to minimize the heat loss that is not transmitted to the refrigerator cabinet by directly heating by conduction heat transfer in forming the foam by heating the foam liquid injected into the refrigerator cabinet to a predetermined temperature range.

Here, it is preferable that the contact surface includes both the contact surface with the support portion and the contact surface with the core portion because it can quickly heat the refrigerator cabinet.

In addition, the heating element is formed of a heating paint or planar heating element is effective for convenience of manufacturing.

In addition, preferably configured to further include a temperature sensor for detecting the temperature of the cabinet. This is to implement the feedback control so that the temperature sensed by the temperature sensor does not exceed a certain temperature.

At this time, the temperature sensor is effectively formed in both the core portion and the support portion in terms of sophisticated temperature control.

On the other hand, according to another field of the invention, the present invention, a method for heating a cabinet installed to be molded in a foam molding system of a refrigerator cabinet, comprising the steps of: forming a heating element on the contact surface that the cabinet contacts; Heating the cabinet by heat conduction from the heating element; It provides a cabinet heating method of the foam molding system of the refrigerator cabinet comprising a.

Detecting the temperature of the cabinet; A feedback control step of adjusting an amount of heat of the heating element to feedback control based on the detected temperature; Further inclusion is desirable because it enables sophisticated temperature control.

The feedback control step may be configured to stop heating the refrigerator cabinet when the detected temperature is higher than the set temperature and to heat the refrigerator cabinet when the detected temperature is lower than the set temperature.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, a detailed description of known functions or configurations will be omitted to clarify the gist of the present invention.

4 to 7 are related to the heating apparatus of the foam molding system of the refrigerator cabinet according to an embodiment of the present invention, Figure 4 is a perspective view showing the configuration of the foam molding system of the refrigerator cabinet, Figure 5 is a core of Figure 4 6 is a schematic diagram showing a heating state of the foam molding system of FIG. 4, and FIG. 7 is a control flowchart by feedback control of FIG.

As shown in the figure, the foam molding system 100 of the refrigerator cabinet provided with a heating apparatus according to an embodiment of the present invention, the base plate 10 for supporting the entire load and the refrigerator cabinet is inserted A support part 20 formed to seal up, down, left, right, front and back and withstand a predetermined pressure, the core part 30 formed of ABS resin in the shape of the inner surface of the cabinet, and the core part 30 is configured to include a blower 40 for injecting an external cold wind to prevent overheating.

The support 20 is composed of a plurality of support plates 21, 22, 23, 24, 25, 26 to surround the refrigerator cabinet 90 is inserted. In addition, a heating wire 120 is formed on a contact surface of the support plates 21, 22, 23, 24, 25, and 26 in contact with the refrigerator cabinet 90 to heat the refrigerator cabinet 90 by heat transfer by conduction. do. Meanwhile, in order to maximize heat transfer, the heating wire 120 may be formed on the outer surface of the support as necessary.

The core part 30 includes a refrigerator compartment core 31 and a freezer compartment core 32, and heats the refrigerator cabinet 90 by conduction heat transfer to the contact surfaces of the core parts 31 and 32 in contact with the refrigerator cabinet 90. The heating wire 130 is formed to be.

Here, the heating wires 120 and 130 may be formed of a heating paint or a planar heating element to generate heat when power is supplied.

In addition, the support unit 20 and the core unit 30 are equipped with a temperature sensor 200 formed of a plurality of thermocouples to detect the temperature of the refrigerator cabinet 90. Here, it is preferable that the temperature sensor 200 directly measures the temperature of the refrigerator cabinet 90, but the temperature sensor 200 is installed in the refrigerator cabinet in which the process of being installed and separated in the foaming system 100 is repeated. Since it is very difficult, the support plates 21, 22, 23, 24, 25, 26 and the core plates 31, 32 on which the heating wires 120, 130 are formed are separated from the surface of the support plates 21, 22, 23, 24, 25, 26 and the cores 31, 32, and according to the thermal conductivity coefficients of the support plates 21, 22, 23, 24, 25, 26 and the core portions 31, 32 and the thermal conductivity coefficients of the refrigerator cabinet. Proper compensation inference can be used to determine the temperature in the refrigerator cabinet. This compensation process may be analyzed analytically by comparing the difference in the coefficient of thermal conductivity, and in order to more accurately grasp the correlation between the temperature of the support 20 and the core 20 in and around the refrigerator cabinet 90 It can also be determined by experimental verification.

In addition, since the fridge core 31 and the freezer compartment core 32 are adjacent to each other, and the heat wire 130 is relatively hard to dissipate, the heat wire 130 may have a lower density to prevent local heat concentration. Do.

Hereinafter, the operating principle of one embodiment of the present invention will be described in detail.

The foaming process using the foam molding system 100 of the refrigerator cabinet configured as described above, the foaming process may be made while rotating the conveyor belt 51 as in the prior art, but does not require a heating oven 50 The foaming process may be performed in place without movement of the foam molding system 100 of the refrigerator cabinet.

In the foaming process of the foam molding system 100 of the refrigerator cabinet according to the embodiment of the present invention, as shown in FIG. 7, when the foam molding system 100 reaches a heating step, the support part 20 and the core part ( Heat is generated through the power supply lines 110 and 121 in the heating wires 120 and 130 formed at 20 to start heating so that the heat generated in the heating wires 120 and 130 is transferred to the refrigerator cabinet 90 by conduction.

Here, the temperature sensor 200 attached to the support part 20 and the core part 30 detects the temperature of the refrigerator cabinet 90 (S1), and the detected refrigerator cabinet 90 temperature T1 is polyurethane foamed. The hot wires 120 and 130 are feedback-controlled to be in the range of 45 ° C. ± 5 ° C., which is the foaming temperature of the liquid (S2). That is, when the detection temperature T1 is lower than the predetermined set upper limit temperature To, power is continuously supplied to heat the refrigerator cabinet 90 by the heating wires 120 and 130 of the support unit 20 and the core unit 30. If the detected temperature T1 is higher than the predetermined set upper limit temperature To, the power supply is cut off to stop the heating (S3). At this time, it is preferable that set upper limit temperature To is 50 degreeC which is an upper limit of foaming temperature.

In addition, the blower 40 may be operated to blow cold air while the heating is stopped, and the blower 40 may be operated only when the overshoot occurs at a predetermined value higher than the set upper limit temperature To. It may also be activated (S4). At this time, it is effective that set lower limit temperature To 'is 40 degreeC which is a lower limit of foaming temperature.

Then, when the detection temperature T1 is lower than the set lower limit temperature To ', heating is started again to maintain the temperature of the refrigerator cabinet 90 within the foaming temperature range (S1).

Here, the temperature sensor 200 is mounted on the support 20 and the core 30 to detect the temperature of the refrigerator cabinet 90, by averaging each of the detected temperature to the feedback control as described above Maintain the foaming temperature. In addition, only the average value of the detected temperature T1 detected by the temperature sensor 200 mounted on the support 20 controls the heating wire 120 of the support 20, and the temperature sensor mounted on the core 30 ( The heating wire 130 of the core part 30 may be separately controlled only as an average of the detection temperature T1 detected by the 200.

Therefore, since the heating apparatus of the foam molding system of the refrigerator cabinet according to the present invention heats the refrigerator cabinet 90 by conduction, unlike the related art, heat loss can be minimized, and the support unit 20 and the core unit 30 are provided. By feedback control to the detected temperature by the mounted temperature sensor 200, it is possible to precisely control the temperature of the refrigerator cabinet 90 within the foaming temperature range.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

As described above, according to the present invention, a heating element formed by a hot wire on the contact surface of the refrigerator cabinet installed to form a heat insulating part in the foam molding system of the refrigerator cabinet, and conducts heat transfer to directly transfer the heat generated from the hot wire to the refrigerator cabinet By heating the refrigerator cabinet by it, it is possible to minimize the heat loss generated in the heating process, by mounting a temperature sensor to detect the temperature of the refrigerator cabinet by the feedback control using the detected temperature. Provided is a cabinet heating apparatus and heating method for a foam molding system of a refrigerator cabinet capable of precise temperature control within a set temperature range suitable for foaming.

In addition, according to the present invention, since the refrigerator cabinet is heated to a temperature range suitable for foaming by a heating device in the foam molding system of the refrigerator cabinet, a separate heating oven is not required, and the heating oven is input for a predetermined time for heating. Since there is no need for a rotary foaming process line consisting of a conveyor belt, the cost of equipment investment for foaming the refrigerator cabinet can be greatly reduced.

Claims (12)

In the foam molding system of the refrigerator cabinet having a support portion for supporting the outer surface of the cabinet, and a core portion for supporting the inner surface of the cabinet, A heating element formed on a contact surface of the cabinet installed in the foam molding system; A temperature sensor for detecting a temperature of the cabinet; Cabinet heating apparatus of the foam molding system of the refrigerator comprising a. The method of claim 1, And the contact surface includes both a contact surface with the support portion and a contact surface with the core portion. The method of claim 1, The heating element is a cabinet heating apparatus of the foam molding system of the refrigerator, characterized in that formed of a heating paint. The method of claim 1, The heating element is a cabinet heating apparatus of the foam molding system of the refrigerator, characterized in that formed of a planar heating element. delete The method of claim 1, The temperature sensor is a cabinet heating apparatus of the refrigerator foam molding system, characterized in that formed in both the core portion and the support portion. The method of claim 1, And a heating value of the heating element by feedback control based on the temperature detected from the temperature sensor. delete A method of heating a cabinet installed to be molded in a foam molding system of a refrigerator cabinet, Forming a heating element on a contact surface in which the cabinet contacts; A heating step of heating the cabinet by heat conduction from the heating element; Wherein the heating step comprises: Detecting a temperature of the cabinet; A feedback control step of adjusting the calorific value of the heating element based on the detected temperature of the cabinet; The cabinet heating method of the foam molding system of the refrigerator cabinet comprising a. The method of claim 9, The feedback control step is configured to stop heating the cabinet when the detected detection temperature is higher than the set upper limit temperature, and to heat the cabinet when the detected temperature is lower than the set upper limit temperature. Cabinet heating method of foam molding system. The method of claim 10, The set temperature is the upper limit of the foaming temperature range of the foam liquid injected into the cabinet, cabinet heating method of the foam molding system of the refrigerator cabinet. The method of claim 10, And a cooling step of blowing cold air when the detected temperature is higher than the set temperature.

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