KR200218472Y1 - Sensing Method For Freezing Limit Of Ice Storage Tank - Google Patents

Abstract

The present invention relates to a selection of a sensor for detecting a signal and an apparatus method thereof for the purpose of stopping the operation of the refrigerator when the amount of ice formed on the surface of the heat pipe in the ice storage tank reaches a certain level. ,

Features and better effect of installing a thermo sensor at any ice limit line that is expected to stop ice making when ice reaches a certain thickness from the surface of heat pipe installed under the surface of ice tank. In order to obtain a surface of the thermosensitive element except for the region where the contact of the ice is expected to have a feature of wrapping with a heat insulating member.

Description

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

The present invention relates to a sensor for deicing restriction that is set up to determine the completion of deicing in an ice storage tank used in an ice storage cooling system and to stop 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. Power ice heat 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 is composed of electrodes, or permanent magnet is embedded in the rich and lead switch operation This can be seen on a commercial product configured with a level switch.

The method of determining the deicing limit using the level sensor is to be aware of the remaining ice level and the level of water at the time before the ice is started. Generally, it ignores this 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 thickness of the ice 1mm is extremely small, the error of the water level mm causes the error of the water thickness mm, which is the result of the excessive ice or lack of ice making. The error of the water level several millimeters is the cause.

If you want to determine the limit of deicing by using the level sensor, the deicing limit can be detected only when 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 the remaining ice has not been thawed at the beginning of the process, or if the temperature of the water is not constant or the water level is not constant due to evaporation, the above-mentioned closure occurs. It is not easy to measure, calculate, and control the measurement of 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 to stop 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. The present invention is supposed to be due to the feature is characterized in that it can be used as a sensor for detecting the deicing limit.

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

Figure 1a 'is a cross-sectional view of the 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 an embodiment perspective view of fixing the detection sensor of the present invention to the outer frame

Figure 3b is an embodiment perspective view of fixing the detection sensor of the present invention to the heat pipe

Figure 4 is a longitudinal cross-sectional view of the external ice cube 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.

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

Reference Signs List 1 heat transfer tube 2 ice 3 detection sensor 4 thermo sensor

5 Insulation member 6 Pipe 7 Wire 8 Bonding member

9 connection member 10 horizontal frame 11 outer vertical frame

19: protrusion fixing part 20: protrusion fixing part 50: ice storage

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

The term 'detection sensor' refers to the components of the present invention, and 'temperature element' refers to the device itself whose resistance value changes with temperature changes such as thermistors and thermocouples 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). This is a cross-sectional view showing a state where only the surface of the detection sensor is in contact.

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. The upper side of the thermosensitive element 4 is connected to the electric wire (7) for passing a current, and the 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. The heat insulating member 5 surrounds all but both sides of the thermosensitive element, and wraps up to the bottom of the pipe 6, wherein the pipe and the thermosensitive element are insulated by the heat 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.

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

Figure 3b is configured to be connected to each other by the clip-type binding member (8) which is bound as if each heat pipe is wrapped in two heat pipes (1) (1 ') having the closest distance inside the ice tank, and the center of the connection member (9) Protrusion fixing part (20) is provided to fix the detection sensor (3) to the temperature sensing 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 to stop the operation of the refrigerator by applying a signal. A configuration for drawing contact signals that can be made is prepared together.

Configure as above and look at the effect.

If the diameter of the heat transfer tube 1 is 10mm, the distance between the heat transfer tube and the adjacent heat transfer tube is 70mm, and the thickness of the heat sensing element 4 is 6mm in the configuration as shown in FIG. 4, the distance between the heat transfer tube surface and the temperature sensing element surface is 27mm. When the ice (2) is formed and frozen to the surface of the thermosensitive element, the thickness of the ice becomes 27 mm and the distance between the ice and the ice becomes 6 mm, so that the water maintains a very suitable distance for thawing. In order to prove the present invention, the present inventors constructed and tested similarly to the above, and obtained a change characteristic of temperature with respect to time as shown in FIG. 5.

In Fig. 5, the 'A' line shows the characteristic of the detection sensor 3 which does not surround the insulating member 5 on the surface of the thermosensitive element 4, and the 'B' line shows the insulating member 5 on the surface of the thermosensitive element 4; ) Shows the characteristics 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. While continuing to form the ice in the temperature sensing element (4) and the contact with the ice (2) it can be seen that the temperature drops sharply, while the downward characteristic of the thermal element wrapped around the heat insulating member (5) is sharp, The downward characteristic of the unwrapped thermostat was found to be gentle.

If the temperature sensing 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 temperature sensing element was located closer to the heat pipe (1) than the experiment 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 temperature is affected by the coolant temperature, thereby detecting a lower 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 that when the ice is in contact with the water, the area of water is larger than the area, so the influence of water temperature is reduced and Means were added to easily detect the temperature.

According to the results of the experiment for the proof of the present invention, it was confirmed that there is no problem in utilizing as a sensor for limiting the deicing of the external ice cube type ice tank if the device is placed in the place where the optimum ice is in contact with 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.

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

In the zigzag arrangement, the pipe 6 of the detection sensor 3 maintains an oblique angle of 45 °, not vertical, when it is intended to fix the thermosensitive element at the center between the heat pipe 1 and the heat pipe 1 '. You have to.

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.

And the distance between the ice and the ice is determined according to the thickness of the thermosensitive element. If the distance of ice to be obtained is 5mm and the thickness of the thermosensitive element 4 is 5mm or more, the set point of the temperature is 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. If you want to get a little thicker, you can set -2 ℃ ~ -3 ℃, but it is good to find the set point where ice and ice do not stick together.

As described above, the present invention has an ice making limit line at a place having a distance that determines an arbitrary ice thickness to stop ice making when ice having an arbitrary thickness is obtained as ice forms on the surface of a heat pipe in an ice storage tank. 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 out-of-sea ice skating tanks freeze many ice within a given volume and have excellent performance when they are easy to thaw, and the present invention is inexpensive to control the deicing operation of such out-of-sea ice skating 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 signal detection method for limiting ice making of an ice storage tank according to claim 1, wherein the surface of the thermosensitive element is covered with a heat insulating member at a portion other than the surface where the ice contacts the surface. The method of claim 1, wherein the thermosensitive element is fixed to an arbitrary heat transfer tube and a heat transfer tube adjacent to each heat transfer tube, and is fixed to the center of a connection member connecting the binding members to each other. Way.