JPH08247646A - Direct cooling type refrigerating device - Google Patents

Abstract

PURPOSE: To make it possible to reduce the possibility of accident that the HC refrigerant catches fire by installing a sensor control box which measures changes in the resistance of a gas detection sensor to a machine chamber outside an insulated box body and air-tightening all connection areas of wiring inside and outside the insulation box which has a power source relay connected thereto to a satisfactory extent. CONSTITUTION: A box lamp 13 is installed inside an insulated box body 2. The box lamp 13 is turned on and off with a contact type door switch 14. A change in the resistance of a detection sensor 19, which serves as contact equipment, is measured with a sensor control box 20. A power source relay 1 is conected to the sensor control box 20. Furthermore, the connection areas of wiring inside and outside the insulated box body 2 is air-tightened to a satisfactory extent. This construction makes it possible to detect any leakage of HC refrigerants inside a refrigerator with the gas detection sensor 19, even if the leakage occurs, and operate the power source relay 21 by way of the sensor control box 20 and cut electricity from a socket 15 and thereby reduce the danger that the HC refrigerant catches fire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant, and more particularly to a direct cooling type refrigerating apparatus using a flammable refrigerant.

[0002]

2. Description of the Related Art In recent years, chlorofluorocarbons (hereinafter C
Environmental problems such as ozone depletion and global warming due to the influence of FC) have been attracting attention. From this point of view, the total abolition of CFC, which is a refrigerant, has become an extremely important theme.

At present, while CFCs are being converted into hydrochlorofluorocarbons (hereinafter referred to as HCFCs) and hydrofluorocarbons (hereinafter referred to as HFCs), they are flammable but have very little effect on global warming (hereinafter referred to as HC). (Also referred to as "refrigerant").

[0004] For example, P of the bibliography of commission B1 / 2 of IIR-IIF held in Belgium in February 1993
281-P291 indicate that propane (R290) and isobutane (R600a), which are HC refrigerants, can be applied to a household refrigerator.

Hereinafter, an HC refrigerator, which is one of the conventional direct-cooling type refrigerating apparatuses, will be described with reference to the drawings.

FIG. 9 is a sectional view of a conventional HC refrigerator. In FIG. 9, 1 is the body of the refrigerator, 2 is a heat-insulating box,
3 is an outer box made of steel plate, 4 is an inner box made of ABS or PS, and 5 is a heat insulating material made of urethane or the like. A door 6 is provided on the heat insulating box 2.

A machine room 7 is installed below the rear surface of the main body 1. An evaporator 8 is installed on the back side of the inner box 4. Further, a compressor 9 is installed in the machine room 7, and the condenser 1
0, the capillary tube 11, and the evaporator 8 are sequentially connected in an annular shape to form a refrigeration cycle.

In this refrigeration cycle, the HC refrigerant 12
Is enclosed and power is supplied from the power outlet 15. Inside the inner box 4, an inside lamp 13 and a contact type door switch 14 for blinking the inside lamp 13 are installed. Figure 10 shows a contact type door switch 1
4 shows a sectional view of FIG. A knob 16, a cam 17, and a contact 18 are incorporated inside.

The operation of the direct-cooling type refrigerating apparatus constructed as above will be described below.

First, when the compressor 9 is operated by supplying electricity from the power outlet 15, the high-temperature and high-pressure HC refrigerant 12 discharged from the compressor 9 is condensed in the condenser 10.
Capillary tube 1 that exchanges heat with the outside air to condense and liquefy
Flow into 1.

The HC refrigerant 12 is supplied to the capillary tube 11.
Is depressurized and evaporated in the evaporator 8 to exchange heat with the air inside the inner box 4, and at this time, the water in the refrigerator adheres to the surface of the inner box 4 as frost.

The contact-type door switch 14 is operated by opening and closing the door 6, and when the door 6 is opened, the cam 17 is operated in conjunction with the knob 16 and the contact 18 is energized, whereby the interior light 1
3 lights up.

[0013]

However, in the above-mentioned conventional structure, since the flammable HC refrigerant is used as the cooling refrigerant, the frost adhering to the surface of the inner box is removed by using an ice pick or the like. When the inner box is broken and the evaporator is damaged, flammable HC refrigerant may leak into the inner box of the refrigerator.

The inner box has contact devices such as an interior light and a door switch. When the door is opened while the inner box is filled with HC refrigerant, these contact devices serve as ignition sources and are flammable H
There is a problem that the C refrigerant is ignited and a serious accident such as an injury or a burn is caused by the door being blown off.

Further, by continuing the operation of the compressor with the evaporator damaged, the refrigerant in the condenser flows through the capillary tube into the refrigerator from the damaged portion of the evaporator, and the concentration of the HC refrigerant in the inner box increases. Then, there is a problem in that the risk of ignition of the HC refrigerant is further increased when the door is opened while being accompanied by an ignition source such as cigarette.

The present invention solves the problems of the prior art.
An object of the present invention is to provide a direct cooling type refrigerating apparatus which can reduce the risk of ignition of the C refrigerant.

[0017]

To achieve this object, a direct-cooling type refrigerating apparatus of the present invention comprises a compressor, a condenser, a capillary tube, and an evaporator, which are sequentially connected in an annular shape.
Inside the box having a refrigeration cycle filled with refrigerant, an internal light, a contact-type door switch that blinks the internal light, and a gas detection sensor in the lower interior of the internal compartment, in a machine room outside the box. In order to take out the contact device to the outside, is equipped with a gas detection sensor control box for measuring the resistance change of the gas detection sensor and a power supply relay connected to it.

Further, an internal light and an internal light are provided inside a box having a refrigeration cycle in which a compressor, a condenser, a capillary tube, and an evaporator are sequentially connected in an annular shape and a hydrocarbon refrigerant is enclosed. And a non-contact proximity sensor type door switch for blinking, and a proximity sensor control box for controlling the proximity sensor to bring the contact device to the outside in a machine room outside the box.

Further, a compressor, a condenser, a capillary tube, and an evaporator are sequentially connected in an annular shape to form a light-emitting diode type light-emitting device that is turned on by a transistor inside a box having a refrigeration cycle in which a hydrocarbon refrigerant is sealed. It is equipped with an internal light and a non-contact proximity sensor type door switch that blinks the internal light, and a proximity sensor control box for controlling the proximity sensor is installed in the machine room outside the box to output the contact device to the outside. I have it.

[0020]

The direct-cooling type refrigerating apparatus of the present invention has the above-mentioned structure, and when the frost adhering to the surface of the inner box is removed by using an ice pick or the like, it is flammable when the inner box is broken and the evaporator is damaged. Even if HC refrigerant leaks into the inner box of the refrigerator, when the gas detection sensor installed in the refrigerator detects the HC refrigerant in the refrigerator, the gas detection sensor control box measures the resistance change of the sensor and the power relay Is activated,
The power supply from the power outlet can be cut off, and the contact device inside the box can be disabled. Also, by turning off the power, the compressor operation can be stopped, and it is possible to prevent the HC refrigerant concentration inside the condenser from further increasing due to flowing into the inside of the refrigerator from the damaged portion of the evaporator through the capillary tube. It is possible to reduce the ignition of the HC refrigerant by the ignition source outside the refrigerator when the door is opened.

When the frost adhering to the surface of the inner box is removed by using an ice pick or the like, a combustible HC refrigerant fills the inner box of the refrigerator when the inner box is broken and the evaporator is damaged. Even if you open the door with, there is no contact discharge because it uses a contactless proximity sensor type door switch.
Ignition of the HC refrigerant can be reduced.

Also, when the frost adhering to the surface of the inner box is removed by using an ice pick or the like, flammable HC refrigerant fills the inner box of the refrigerator when the inner box is broken and the evaporator is damaged. Even if the door is opened with, the light emitting diode type interior lamp is used, so there is no discharge due to poor contact of the light bulb, and contact discharge is not possible because the contactless proximity sensor type door switch is used. Since it does not exist, it is possible to reduce ignition to the HC refrigerant.

[0023]

Embodiments of the direct cooling type refrigerating apparatus according to the present invention will be described below with reference to the drawings. The same configurations as the conventional ones are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a sectional view of a refrigerator according to the first embodiment of the present invention. In FIG. 1, 19 is a gas detection sensor. Reference numeral 20 is a gas detection sensor control box. Reference numeral 21 is a power relay. Gas detection sensor 19
Is installed in the lower part of the back surface inside the inner box 4 in order to effectively detect the hydrocarbon refrigerant having a higher specific gravity than air.

A gas detection sensor control box 20 and a power supply relay 2 are provided in the machine room 7 below the rear surface of the main body 1.
1 is installed, and the power outlet 15 and the compressor 9 are connected to the power relay 21.

A simple electrical connection diagram of the compressor 9, the gas detection sensor 19, the gas detection sensor control box 20, and the power supply relay 21 is shown in FIG.

FIG. 3 is a sectional view of the gas detection sensor 19 described above.
Shown in The gas detection sensor 19 is a hot-wire type semiconductor sensor including a metal oxide semiconductor 22 and a platinum wire coil 23. The platinum wire coil 23 detects changes in heat conduction and electric conductivity due to gas adsorption on the surface of the metal oxide semiconductor 22. It is measured as a change in resistance value seen from both ends of. Also H
The detectable concentration of the C refrigerant 12 is 10 ppm.

The operation of the direct-cooling type refrigerating apparatus configured as described above will be described with reference to FIGS.

When the compressor 9 is operated by supplying electricity from the power outlet 15, the high temperature and high pressure HC refrigerant 12 discharged from the compressor 9 is condensed and liquefied by exchanging heat with the outside air in the condenser 10. It flows into the capillary tube 11. The HC refrigerant 12 is decompressed by the capillary tube 11, evaporated by the evaporator 8, and exchanges heat with the air inside the inner box 4, and at that time, the water inside the inner box 4 adheres to the surface of the inner box 4 as frost.

Here, when the frost adhering to the surface of the inner box 4 is removed by using an ice pick or the like, when the inner box 4 is broken and the evaporator 8 is damaged, the flammable HC refrigerant 12 becomes the inner box of the refrigerator. 4 inside the inner box 4 when leaking to the inside of the HC refrigerant 1
2 When the concentration becomes 10 ppm or more, the gas detection sensor 19
Detects the HC refrigerant 12, and the gas detection sensor control box 20 measures the resistance change of the gas detection sensor, whereby the power supply relay 21 operates and the supply of electricity from the power outlet 15 is stopped.

Therefore, since the contact-type door switch 14 is not energized even when the door is opened, there is no danger of ignition due to contact discharge. Further, since the compressor 9 is also stopped at the same time, it is possible to minimize the outflow of the HC refrigerant 12 to the inside of the inner box 4.

Next, the second of the direct cooling type refrigerating apparatus according to the present invention.
Embodiments will be described with reference to the drawings. The same configurations as the conventional ones are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 4 is a sectional view of a refrigerator according to the second embodiment of the present invention. In FIG. 4, reference numeral 24 is a proximity sensor type door switch. A proximity sensor control box 26 is installed in the machine room 7 below the rear surface of the main body 1. A simple electrical connection diagram of the compressor 9, the interior light 13, the proximity sensor type door switch 24, and the proximity sensor control box 26 is shown in FIG.

A sectional view of the proximity sensor type door switch 24 is shown in FIG. 16 is a knob. Reference numeral 25 is a proximity sensor. 27 is a movable piece corresponding to the proximity sensor, which is made of metal such as iron or aluminum. The proximity sensor 25 is a high-frequency oscillation type sensor, and can perform detection by stopping oscillation due to impedance change of the high-frequency oscillation coil.

The operation of the direct-cooling type refrigerating apparatus constructed as above will be described with reference to FIGS.

When the compressor 9 is operated by supplying electricity from the power outlet 15, the high temperature and high pressure HC refrigerant 12 discharged from the compressor 9 is condensed and liquefied by exchanging heat with the outside air in the condenser 10. It flows into the capillary tube 11.

The HC refrigerant 12 is supplied to the capillary tube 11.
Is depressurized and evaporated in the evaporator 8 to exchange heat with the air inside the inner box 4, and the water inside the inner box 4 adheres to the surface of the inner box 4 as frost.

The proximity sensor type door switch 24 includes the door 6
When the door 16 is opened, the knob 16 protrudes when the door 6 is opened, and the movable piece 27 that slides in conjunction therewith reaches the ON position 28 of the proximity sensor 25.
The proximity sensor control box controls the impedance change of the high frequency oscillation coil of No. 5 to energize and turn on the interior lamp 13.

When the door 6 is closed, the knob 16 is pushed into the door 6 and the movable piece 27 that slides in conjunction with it is O.
When it comes to the FF position 29, the proximity sensor 25 does not detect the movable piece 27, so that the interior lamp 13 is turned off without energizing.

Here, when the frost adhering to the surface of the inner box 4 is removed by using an ice pick or the like, when the inner box 4 is broken and the evaporator 8 is damaged, the flammable HC refrigerant 12 becomes the inner box of the refrigerator. 4 leaks to the inside of the inner box 4, the HC refrigerant 1
Even if the door 6 is opened and the interior lamp 13 is turned on in the state where 2 is full, there is no contact in the door switch, so there is no danger of ignition of the HC refrigerant due to contact discharge. Further, since the shape of the door switch is compatible with the conventional one, the cost can be kept low, and the R134a and the HC refrigerator can be produced in parallel.

Next, a third embodiment of the direct cooling type refrigerating apparatus according to the present invention will be described with reference to the drawings. The same configurations as the conventional ones are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 7 is a sectional view of a refrigerator according to the third embodiment of the present invention. In FIG. 7, reference numeral 24 is a proximity sensor type door switch. A proximity sensor control box 26 is installed in the machine room 7 below the rear surface of the main body 1.

Reference numeral 30 is a light emitting diode type interior lamp. Three
Reference numeral 1 is a transistor for lighting the light emitting diode.

Compressor 9, proximity sensor type door switch 2
FIG. 8 shows a simple electrical connection diagram of the proximity sensor control box 26, the light-emitting diode type interior lamp 30, and the transistor 31.

A sectional view of the proximity sensor type door switch 24 is shown in FIG. 16 is a knob. Reference numeral 25 is a proximity sensor. 27 is a movable piece corresponding to the proximity sensor, which is made of metal such as iron or aluminum. The proximity sensor 25 is a high-frequency oscillation type sensor, and can perform detection by stopping oscillation due to impedance change of the high-frequency oscillation coil.

The operation of the direct-cooling type refrigerating apparatus configured as described above will be described with reference to FIGS. When the compressor 9 is operated by supplying electricity from the power outlet 15, the high-temperature and high-pressure HC refrigerant 1 discharged from the compressor 9
Reference numeral 2 denotes a condenser 10, which exchanges heat with the outside air to be condensed and liquefied, and flows into the capillary tube 11.

The HC refrigerant 12 is supplied to the capillary tube 11.
Is depressurized and evaporated in the evaporator 8 to exchange heat with the air inside the inner box 4, and at that time, the water in the refrigerator adheres to the surface of the inner box 4 as frost. The proximity sensor type door switch 24 is used for the door 6
When the door 16 is opened, the knob 16 protrudes when the door 6 is opened, and the movable piece 27 that slides in conjunction therewith reaches the ON position 28 of the proximity sensor 25.
The proximity sensor control box controls the impedance change of the high frequency oscillating coil of No. 5 to energize, and the light emitting diode type interior lamp 30 through the transistor 31.
Light up.

When the door 6 is closed, the knob 16 is pushed into the door 6, and the movable piece 27 that slides in conjunction with it is O.
At the FF position 29, the proximity sensor 25 does not detect the movable piece 27, so that the light-emitting diode type interior lamp 30 is turned off without being energized.

Here, when the frost adhering to the surface of the inner box 4 is removed using an ice pick or the like, when the inner box 4 is broken and the evaporator 8 is damaged, the flammable HC refrigerant 12 becomes the inner box of the refrigerator. 4 leaks to the inside of the inner box 4, the HC refrigerant 1
Even if the door 6 is opened in a state in which 2 is filled, there is no contact discharge because the contactless proximity sensor type door switch 24 is used and the light emitting diode type interior lamp 30 is used. Since there is no discharge due to poor contact with the HC refrigerant, there is no danger of ignition of the HC refrigerant.

Further, since the shape of the door switch is compatible with the conventional one, the cost can be kept low and the R
It is possible to produce 134a and an HC refrigerator in parallel. Also,
By using a light-emitting diode type interior lamp, the amount of heat generated inside the box is reduced and the input is saved.

[0051]

As described above, in the direct-cooling type refrigerating apparatus of the present invention, the compressor, the condenser, the capillary tube, the evaporator, and the suction pipe are sequentially connected in an annular shape to contain the HC refrigerant refrigerant. It has a refrigerating cycle, a compartment light inside the box, a contact type door switch that blinks the compartment light, and a gas detection sensor, and a gas detection sensor control box in the machine room at the lower back of the main body. By installing a power relay connected to it, when removing the frost adhering to the inner box using an ice pick, etc., when the inner box is crushed and the evaporator is damaged, the flammable HC refrigerant is stored in the refrigerator. Even if it leaks to the inside, the gas detection sensor installed in the storage detects the HC refrigerant concentration in the storage, the power relay operates through the gas detection sensor control box, and the electricity from the power outlet is detected. To cut the paper. Therefore, the contact device inside the box can be disabled. In addition, the contact devices such as the gas detection sensor control box and power relay are installed outside, so it is possible to prevent ignition of the HC refrigerant, and also to turn off the power to stop the operation of the compressor. It is possible to prevent a further increase in the concentration of HC refrigerant in the refrigerator due to the HC refrigerant flowing into the refrigerator from the damaged portion of the evaporator through the capillary tube, sparks due to metal contact when the door is opened, and HC refrigerant due to cigarettes. Ignition can be reduced.

Further, the compressor, the condenser, the capillary tube, the evaporator, and the suction pipe are sequentially connected in an annular shape to have a refrigeration cycle in which an HC refrigerant refrigerant is sealed,
The inside light of the box and the proximity sensor type door switch that blinks the inside light are installed in the box, and the proximity sensor control box is installed in the machine room at the lower back of the main body to prevent the frost adhering to the inside box. When removing it using an ice pick etc., it is flammable H when it breaks the inner box and breaks the evaporator.
Even if the door is opened in a state where the refrigerant C is filled in the inner box of the refrigerator, there is no contact discharge because the contactless proximity sensor type door switch is used, so ignition to the HC refrigerant can be reduced. it can. Further, since the shape of the door switch is compatible with the conventional one, the cost can be kept low, and the R134a and the HC refrigerator can be produced in parallel.

Further, the compressor, the condenser, the capillary tube, the evaporator, and the suction pipe are sequentially connected in an annular shape to have a refrigeration cycle in which an HC refrigerant refrigerant is sealed,
It has a light emitting diode type internal light in the box and a proximity sensor type door switch that blinks the internal light, and it is attached to the inner box by installing a proximity sensor control box in the machine room at the lower back of the main body When removing the frost with an ice pick etc., even if the door is opened with flammable HC refrigerant filling the inside box of the refrigerator when the inside box is broken and the evaporator is damaged, the contactless type Since it uses the proximity sensor type door switch, there is no contact discharge, and since the light emitting diode type interior lamp is used, there is no discharge due to poor contact of the light bulb, reducing ignition to HC refrigerant. can do. Also, since the shape of the door switch is compatible with the conventional one, the cost can be kept low,
R134a and HC refrigerator can be produced in parallel. Further, by using the light emitting diode type interior lamp, the amount of heat generated in the box body is reduced and the input is saved.

[Brief description of drawings]

FIG. 1 is a sectional view of a direct-cooling type refrigerating apparatus according to a first embodiment of the present invention.

FIG. 2 is a simple electrical connection diagram of the first embodiment of the present invention.

FIG. 3 is a sectional view of a gas detection sensor.

FIG. 4 is a sectional view of a direct cooling type refrigerating apparatus according to a second embodiment of the present invention.

FIG. 5 is a simple electrical connection diagram of the second embodiment of the present invention.

FIG. 6 is a sectional view of a proximity sensor type door switch.

FIG. 7 is a sectional view of a direct-cooling type refrigerating apparatus according to a third embodiment of the present invention.

FIG. 8 is a simple electrical connection diagram of the third embodiment of the present invention.

FIG. 9 is a sectional view of a conventional direct-cooling type refrigerating apparatus.

FIG. 10 is a sectional view of a contact type door switch.

[Explanation of symbols]

 2 Insulation box 7 Machine room 8 Evaporator 9 Compressor 10 Condenser 11 Capillary tube 12 Hydrocarbon refrigerant 13 Internal light 14 Contact type door switch 19 Gas detection sensor 21 Power relay 24 Proximity sensor type door switch 25 Proximity sensor 26 Proximity Sensor control box 30 Light-emitting diode type interior light 31 Transistor

Claims (3)

[Claims] 1. A room light inside a heat insulation box having a refrigeration cycle in which a compressor, a condenser, a capillary tube, and an evaporator are sequentially connected in an annular shape and a hydrocarbon refrigerant is enclosed, and a room interior. A contact type door switch that blinks the light,
It has a gas detection sensor at the bottom of the inside of the warehouse, and a machine room outside the heat insulation box has a sensor control box for measuring the resistance change of the gas detection sensor which is a contact device and a power supply relay connected to it. A direct-cooling type refrigerating apparatus, which has a heat-insulating box and completely seals a connecting portion of wiring inside and outside. 2. An internal light and an internal light inside a heat insulating box having a refrigeration cycle in which a compressor, a condenser, a capillary tube, and an evaporator are sequentially connected in an annular shape and a hydrocarbon refrigerant is enclosed. It has a non-contact proximity sensor type door switch that blinks the light, and a machine room outside the heat insulation box has a proximity sensor control box that controls the proximity sensor, which is a contact device, inside and outside the heat insulation box. A direct-cooling type refrigeration system characterized in that the connecting portion of the wiring is completely airtight. 3. A light-emitting diode type in which a compressor, a condenser, a capillary tube, and an evaporator are sequentially connected in an annular shape, and a heat insulation box having a refrigeration cycle in which a hydrocarbon refrigerant is sealed is lighted by a transistor inside. It has an internal light and a non-contact proximity sensor type door switch,
In the machine room outside the heat insulation box, there is a proximity sensor control box that controls the proximity sensor, which is a contact device, and the direct cooling is characterized by completely airtightly connecting the wiring inside and outside the heat insulation box. Type refrigerator.