KR20020030240A - Sensing Method For Freezing Limit Of Ice Storage Tank - Google Patents

Abstract

PURPOSE: A method for detecting signal for limiting ice making of ice storage tank is provided to stop operation of a freezer by detecting signal when thickness of ice, formed on a surface of a heat transfer tube constructed in an ice-on-coil type ice storage tank, reaches a certain value. CONSTITUTION: A temperature detecting element is installed on an ice making limiting line to contact with ice when ice is formed on a surface of a heat transfer tube(1) in an ice storage tank to detect temperature of ice. An insulating member covers the temperature detecting element but the surface contacting with ice. Binding members(8) are bound to two neighboring heat transfer tubes. The temperature detecting element is fixed on a middle of a coupler(9) connecting the biding members.

Description

Signal detection method for limiting ice deicing in ice tanks {Sensing Method For Freezing Limit Of Ice Storage Tank}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor for deicing limitation, which is provided for the purpose of determining the completion of deicing in an ice storage tank used in an ice storage cooling system and stopping the operation of the refrigerator. It is about how to detect directly.

Looking at the conventional technology in this field, most of the conventional techniques are using a level sensor that detects the water level by paying attention to the increase in the volume of water as ice forms. For example, Korean Patent Publication No. 95-0009056 'Active late night using the level sensor. Electric ice storage control method and device 'and Korean Patent Publication No. 92-6075' Method and device for measuring ice making amount of ice storage heat storage system 'and the level switch with electrode, or permanent magnet in the rich and reed switch operation This can be seen in commercial products made up of the derived level switches.

The method of determining the deicing limit using the level sensor is to be aware of the remaining amount of water and the level of water before the start of deicing.In general, it is ignored and only recognizes the water level rising to the set point according to the volume change. If the starting water level is higher than the reference level, the amount of deicing is insufficient. If the starting water level is lower than the reference level, there is an over-de-icing that causes the ice and ice to stick together.

And even if it is controlled in consideration of the starting level, if there is residual ice that does not know how much remains, it is not a measure.

As water has a volume increase of about 9% during the phase change into ice, the increase in water level varies depending on the volume of water in the ice tank, the bottom area, the length of the heat pipe, and the thickness of the ice. The increase in the water level due to the increase in the ice thickness of 1 mm is extremely small, and the error of the water level mm causes the error of the water thickness mm of the ice, which is the result of the excessive ice making or the lack of ice making. The error is a few millimeters of water level to provide the cause.

If you want to determine the limit of deicing by using the level sensor, it is possible to detect the deicing limit only when the water of the same temperature must be maintained at the same level every time ice is started and when there is no residual ice in the water. If there is any remaining ice that does not thaw at the beginning of ice making, or if the water temperature is not constant or the water level is not constant due to evaporation, the above-mentioned closure occurs, and thus the starting point level is removed to remove this closure. It is not easy to measure and calculate the temperature and the amount of residual ice.

The technical object of the present invention is to provide a method of selecting a sensor and an apparatus method for stopping the operation of the refrigerator by extracting a signal when the thickness of the ice formed on the surface of the heat-transfer tube formed in the outer icing ice tank reaches a certain level. Although the thermosensitive element used in the present invention is a means for measuring the temperature of a material, the temperature of the water reaches 0 ° C. even if ice is formed, which is not used until this time, and does not bring a change in temperature any more. The present invention is characterized in that it can be used as a sensor for detecting ice-making limit.

Figure 1a is a cross-sectional view of the detection state of the bidirectional detection sensor of the present invention.

1A 'is a sectional view of a detection state of the one-way detection sensor of the present invention.

Figure 2a is a cross-sectional view of the bidirectional detection sensor of the present invention.

FIG. 2B is a side cross-sectional view of FIG. 2A;

Figure 2a 'is a cross-sectional view of one direction detection sensor of the present invention.

Figure 3a is a perspective view of an embodiment in which the detection sensor of the present invention is fixed to the outer frame.

Figure 3b is a perspective view of an embodiment in which the detection sensor of the present invention is fixed to a heat pipe.

Figure 4 is a longitudinal cross-sectional view of the outer tube ice type ice tank applying the detection sensor of the present invention.

5 is a characteristic graph to which the detection sensor of the present invention is applied.

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

1: heat pipe 2: ice

3: detection sensor 4: temperature sensing element

5: insulation member 6: pipe

7: wire 8: binding member

9: connecting member 10: horizontal frame

11: outer vertical frame 19: protrusion fixing

20: protrusion fixing 50: ice storage

Hereinafter, the technical configuration of the present invention in detail.

The term 'detection sensor' referred to in the present invention refers to the components of the present invention, and the term 'thermal element' refers to a device itself whose resistance value changes according to temperature changes such as a thermistor and a thermocouple constituting the detection sensor. .

Fig. 1A shows a detection sensor (3) [(4) (5) (6) (shown in the center of the tube between the heat pipe 1 and the heat pipe in which ice 2 is formed in an outer tube ice cube tank using a bare tube). 7)] is a cross-sectional view showing the state of contact with

FIG. 1A 'shows that even in the same ice storage tank, the ice 2 is formed in a state where the detection sensor 3 ((4) (5) (6) (7)) is installed at an arbitrary distance from the heat transfer pipe (1). It is sectional drawing which shows the state which contacted the detection sensor.

2A and 2B are cross-sectional views of the detection sensor 3 ((4) (5) (6) (7)) of the present invention. The back side is the side where the ice touches. An electric wire 7 is connected to the upper side of the thermosensitive element 4, and a wire connected to the thermosensitive element passes through the hollow portion of the pipe 6, which can firmly fix the position of the thermosensitive element. ) Surrounds all except the sides of the thermosensitive element and wraps up to the bottom of the pipe (6). The pipe and the thermosensitive element are insulated by an insulating member.

Figure 2a 'is also a cross-sectional view of the detection sensor constituting the present invention is similar to Figure 2a, but the heat insulating member (5) is wrapped around all except one side of the temperature sensing element (4).

Thermostats can be processed in many different forms, typically used in liquids, built into metal pipes and configured to sense the temperature of heat conducted through the metal pipes. In the case of using a thermosensitive element composed of such a metal pipe as a detection sensor, although not shown in the figure, it should be wrapped with a heat insulating member except for a portion where the ice is expected to contact the ice.

3A is a perspective view showing a state in which a detection sensor is mounted on a frame for fixing an inner heat pipe of an ice storage tank, and the temperature sensing element 4 of the detection sensor 3 has a two-stranded heat transfer tube 1 and a heat transfer tube having the closest distance (FIG. 1 ') is fixed to the protruding fixing portion 19 of the heat transfer tube upper horizontal frame 10 so as to be located at the center of the center,

Figure 3b is configured to be connected to each other by the clip-shaped binding member (8) which is bound as if wrapping each heat pipe in the two heat pipe (1) (1 ') having the closest distance inside the ice tank, and the center of the connection member (9) The fixing device of the protruding fixing part 20 which can fix the detection sensor 3 is provided in the thermosensitive element is configured to be located at the center of the straight distance between the heat pipe and the heat pipe.

The horizontal frame 10 is preferably configured so as not to be immersed in water, and the binding member 8 and the connection member 9 is made of a material that is inferior in heat transfer, but if unavoidable in the middle protruding fixing part 20 of the connection member Should be configured so as not to be submerged in water.

4 is a cross-sectional view showing the shape of the detection sensor 3 installed in the external ice cube tank 50. The frame fixing the heat transfer tube in the ice tank 50 includes an outer frame 10 and an inner frame 13; The outer frame is divided into a vertical frame 11 and a horizontal frame 10, and the horizontal frame is divided into an upper frame and a lower frame. Note that the inner frame is composed of only the vertical frame 11, but some parts of the drawings are omitted, and in detail, the heat pipes of the first row fixed to the first vertical frame have the same distance and are parallel to each other. The two rows of heat pipes are arranged in the top and bottom zigzag to be fixed to the second vertical frame to maintain the distance forming a right triangle with the heat pipes of the first row. As it is fixed, all heat pipes have a distance that constitutes an equilateral triangle with the adjacent heat pipes.

The triangle in the center of the figure represents the arrangement of the equilateral triangle and does not have a shape.

Although not shown, when the current flows through the detection sensor 3, the voltage changes depending on the temperature. The voltage is compared with the set voltage and the signal is applied to the NPN transistor base according to the result. A configuration for drawing out a contact signal capable of stopping the operation is prepared.

Configure as above and look at the effect.

if. In the configuration as shown in FIG. 4, assuming that the diameter of the heat transfer tube 1 is 10 mm, the distance between the heat transfer tube and the adjacent heat transfer tube is 70 mm, and the thickness of the temperature sensing element 4 is 6 mm, the distance between the surface of the heat transfer tube and the temperature sensing element surface is When the ice (2) is formed as it becomes 27 mm and the surface of the thermosensitive element is frozen, the thickness of the ice becomes 27 mm and the distance between the ice and the ice becomes 6 mm, which maintains a very suitable distance for thawing as the water flows. By this, the present inventors configured and tested similarly to the above in order to prove the present invention, and obtained a change characteristic of temperature with respect to time as shown in FIG.

The line 'A' in FIG. 5 shows the characteristic of the detection sensor 3 which does not surround the heat insulating member 5 on the surface of the thermosensitive element 4, and the line 'B' shows a heat insulating member ( 5) shows the characteristic of the detection sensor (3) wrapped.

As can be seen from this figure, when ice (2) forms on the surface of the heat transfer pipe (1) by the operation of a freezer outside the display, the temperature of the surrounding water first decreases and reaches a temperature near 0 ° C. After continuing the ice in the thermosensitive element (4) and the contact with the ice (2) it can be seen that the temperature drops rapidly, the downward characteristic of the thermal element wrapped around the insulating member (5) is sharp while The downward characteristic of the unwrapped thermostat was found to be gentle.

If the thermosensitive element was placed in the place where ice could not be contacted in the above experiment, the detection temperature was close to 0 ℃ but it could not detect below zero temperature and the thermosensitive element is located closer to the heat pipe (1) than the experimental position. If so, the thermostat would have detected sub-zero signals and showed more rapid downward temperature changes before the required amount of ice had formed.

This is due to the fact that the temperature of the ice surface is near 0 ° C like water, but the temperature of the refrigerant flowing in the heat pipe 1 is much lower than this, and the temperature is proportional to the distance from the heat pipe surface to the ice surface. In other words, when the thermosensitive element is buried in the ice, the lower temperature is sensed by the direction of the refrigerant temperature.

Although it is not necessary to wrap the thermal element with a heat insulating material, except for the part where the ice is expected to come into contact with the heat insulating material, the reason for the heat insulating material is to reduce the influence of the water temperature as the area of water is larger than the area when the ice is in contact. Means were added to easily detect the temperature.

According to the results of the experiment for the proof of the present invention as described above, it is confirmed that there is no problem in utilizing as a sensor for limiting the deicing of the external ice-cold ice tank when the device is placed in contact with the optimal ice using the thermo sensor. .

Since the method of placing the thermosensitive element outside the ice making limit line where ice can form is not a solution, it is assumed that the thermosensitive element has not been used as a sensor to determine the completion of ice making until now.

As shown in FIG. 4, the arrangement in which each heat pipe has a distance forming a right triangle is a method of filling the most calorie of ice without affecting securing a flow path of water in a limited ice storage volume. 4 and the moon is arranged in a zigzag left and right.

In the zigzag arrangement, the pipe 6 of the detection sensor 3 is angled at an angle of 45 °, not vertical, in order to fix the thermosensitive element at the center between the heat transfer tube 1 and the heat transfer unit 1 '. It must be maintained.

The fastening structure of FIG. 3B corresponds very well even when the oblique 45 ° is to be maintained, and a method of fixing the detection sensor 3 to the outer horizontal frame 10 according to FIG. 3A and fixing to the inner wall of an ice tank not shown. How to do this, etc. should be followed in order to maintain 45 °.

To freeze thicker ice than this in the same configuration as the above example, the distance between the heat pipe and the heat pipe should be designed farther. Because ice tanks are also important to freeze ice, smooth sea ice is also important. If you overlook this and freeze it a lot, the ice tank will be filled with ice and the ice and ice will stick together. In this case, since the flow of water becomes difficult and the thawing is not smooth, effective indoor cooling cannot be performed.

The distance between the ice and the ice is determined according to the thickness of the thermo sensor. If the distance of ice to be obtained is 5 mm and the thickness of the thermo sensor 4 is 5 mm or more, the set point of warming is determined by one experiment. The point can be set, and the ice gap to be obtained is 5mm and the temperature of the thermosensitive element 4 is less than 5mm or in the case of ice tanks where no gap is caused between the ice and the ice, as shown in FIG. If you set the temperature sensing element wrapped only one side of the insulation member in the position will also find the set point in a single experiment.

Although there may be some differences depending on the structure and volume of the ice storage tank, the length of the heat pipe, the thickness of the ice, the performance of the freezer and the evaporation temperature of the refrigerant, the set point in the above configuration is generally around -1 ° C, and satisfactory results are obtained. If you want to get a bit thicker, you can set -2 ℃ ~ -3 ℃, but it is better to find the set point where ice and ice do not stick together.

As described above, in the present invention, when ice having an arbitrary thickness is obtained as ice forms on the surface of a heat pipe in an ice storage tank, an ice-making limit line has a distance that determines an arbitrary thickness of ice to stop ice making. It is characterized in that the device is set so that the thermosensitive element is located there, and the thermosensitive element is characterized in that it is wrapped with a heat insulating member in the area where the contact of the ice is not expected.

It is well known that the external icing ice tanks have excellent performance when they are easily thawed while freezing a lot of ice within a predetermined volume, and the present invention is inexpensive to control ice making operation of such excellent external icing ice tanks. There are advantages to doing this, but more important than that, it is very suitable.

Claims (3)

In the signal detection method for limiting the deicing of an external ice-cold ice tank, if the ice is formed from the surface of the heat pipe in the ice tank, the temperature sensing element is installed at an arbitrary ice-limiting line position that can contact the ice. A signal detection method for limiting ice making of ice storage tanks. The method of claim 1, Signal detection method for the ice making limit of the ice storage tank characterized in that it is wrapped with a heat insulating member in the portion except the surface in contact with the ice on the surface of the thermosensitive element. The method of claim 1, A signal detection method for limiting the ice making of ice storage tank, characterized in that the thermosensitive element is fixed at the center of the connection member connecting each member to a predetermined heat transfer tube and a heat transfer tube next to each other by a binding member.