JPH07280421A - Warning device for cooling system - Google Patents

Abstract

PURPOSE:To inform various abnormalities generated in a cooling system or power supplies. CONSTITUTION:A warning device for a cooling system comprises a motor power supply AC1, to which a motor 111M for a compressor is connected, a plurality of lamps 123, 127, 133 connected to the motor power supply AC1, a plurality of abnotmality detecting means for detecting abnormalities generated on the cooling system to light the lamps 123, 127, 133, respectively, an alarm buzzer connected to an other buzzer power supply than the motor power supply AC1, and means for ringing the alarm buzzer when either of the abnormality detecting means detects abnormality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for notifying an abnormality occurring in a cooling device such as a low temperature showcase or a refrigerator.

[0002]

2. Description of the Related Art Conventionally, in this type of cooling device, for example, Japanese Patent Publication No. 4-32311 (F25D13 / 0).
As shown in 0), the temperature inside the refrigerator such as a prefabricated refrigerator is detected and an alarm device such as a buzzer is driven at an abnormally high temperature or an abnormally low temperature.

In particular, in a cooling device such as a low temperature showcase for controlling the temperature inside the refrigerator in a freezing area, if an abnormality occurs in the equipment and the temperature inside the chamber rises abnormally, the stored ice cream or other product melts. The alarm device is extremely important because it causes a great deal of damage, and it has been desired by the user to install the alarm device.

[0004]

However, in this type of cooling device, various abnormalities such as abnormalities in the temperature inside the refrigerator, high-pressure abnormalities in the refrigeration cycle, clogging of the condenser, and the like occur. Conventionally, an alarm device for notifying each of these plurality of abnormalities by a lamp or the like is not incorporated in the operation circuit of the cooling device, and normally an alarm device (sold separately) is provided afterwards. Therefore, it is necessary to secure a space for mounting the alarm device, which causes a restriction in mounting and also causes a cost increase.

Further, conventionally, the alarm device such as a lamp or a buzzer is also connected to the power source for driving the compressor, so that the alarm is stopped when the power source for the power is cut off. Further, there is also a problem that it is not possible to notify that the power source for power supply is cut off.

The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to provide an alarm device which can notify various abnormalities occurring in a cooling device or a power supply. To aim.

[0007]

SUMMARY OF THE INVENTION An alarm device of the present invention includes a power source for a power source to which a motor of a compressor of a cooling device is connected, a plurality of alarm indicators connected to the power source for the power source, and a cooling device. A plurality of abnormality detection means that detect a plurality of abnormalities that occur and turn on the alarm display respectively, an alarm buzzer connected to a power source for a buzzer different from the power source for power, and one of the abnormality detection means detects an abnormality And a means for sounding the alarm buzzer in the case of doing so.

The alarm device for the cooling device according to the invention of claim 2 is
In addition to the above, power supply abnormality detecting means for detecting abnormality of the power supply for power supply is provided, and means for sounding an alarm buzzer when the power supply abnormality detecting means detects abnormality is provided.

The alarm device for a cooling device according to a third aspect of the present invention is, in addition to the first aspect, provided with a switch for the power source for the buzzer, and stops the alarm buzzer from ringing based on the operation of the switch, and also causes an abnormality. It is characterized in that a means for returning to the initial state based on the elimination of the above is provided.

[0010]

According to the alarm device of the cooling device of the present invention, a plurality of abnormality detecting means for detecting a plurality of abnormalities occurring in the cooling device are provided, and when the abnormality is detected, the alarm indicators are respectively turned on, and Since the alarm buzzer sounds, it is possible to notify the user of various abnormalities that have occurred in the cooling device. Further, since the alarm indicator is incorporated in the operation circuit of the cooling device, there is no restriction on installation.

In particular, the alarm indicator is connected to the power source for power,
Since only the alarm buzzer is connected to another power source for the buzzer, the number of relays can be reduced compared to connecting all the alarm indicators to a power source different from the power source for the power, and the alarm buzzer is also a separate power source. Therefore, by providing the power supply abnormality detecting means for detecting the abnormality of the power supply for power supply as in the second aspect of the present invention, it becomes possible to give an alarm about the power supply abnormality such as when the power supply for power supply is cut off.

A switch is provided in the power source for the buzzer as in the third aspect of the invention, means for stopping the ringing of the alarm buzzer based on the operation of the switch, and returning to the initial state upon elimination of the abnormality. If provided, the alarm indicator lights up due to an abnormality of the cooling device, and after the alarm buzzer sounds and the user confirms the abnormality, only the alarm buzzer will stop ringing with the switch, You will be able to deal with it. Since the alarm buzzer stops ringing when the abnormality is resolved, the usability is significantly improved.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a low temperature showcase 1 as an embodiment of a cooling device to which the present invention is applied, FIG. 2 is a vertical side view of the low temperature showcase 1, and FIGS. 3 and 4 are electrical circuit diagrams of the low temperature showcase 1. Shown respectively.

In each figure, a low temperature showcase 1 is used for displaying and storing ice cream and the like in a convenience store or the like, and is composed of a heat insulating box 2 having a horizontally long rectangular shape opened upward. . This heat-insulating box body 2 includes a metal outer box 3, a metal inner box 6 installed in the outer box 3 with a space, and both boxes 3, 6
It is composed of a heat insulating material 7 such as polyurethane foam which is filled by an in-situ foaming method.

Duct plates 8 and 9 are attached inside the front and rear surfaces of the inner box 6 with a space therebetween.
A bottom plate 11 is detachably installed between the lower ends of the inner box 6 and a series of ducts 12 standing up and down from the bottom surface inside the inner box 6.
A storage chamber 22 is defined inside the base plate 9 and the bottom plate 11. on the other hand,
The bottom wall 13 of the heat insulating box 2 has a stepped shape having a lower portion 13A in the front part and a higher portion 13B in the rear part, and the bottom plate 11 is located above the higher part 13B.

A drain pan 14 is provided on the upper surface of the lower portion 13A, and a drain hole 16 communicating with the outside of the heat insulating box 2 is formed at the lowest position of the drain pan 14. The duct 12 is provided on the drain pan 14.
A horizontally long plate fin type cooler 17 included in the refrigerant circuit of the refrigeration cycle is disposed inside the cooler 1.
In the fan case 18 provided on the front side of the fan 7, a blower 19 composed of a suction type propeller fan is attached.

Higher portion 13B on the rear side of the cooler 17
The stepped portion of the lower portion 13A is formed as an inclined surface 13C so that the upper portion thereof is separated from the cooler 17. The upper end of the duct plate 9 is a discharge port 9A, the upper end of the duct plate 8 is a suction port 8A, and inwardly curved wind direction plates 21, 21 are attached to the discharge port 9A at predetermined intervals.

On the other hand, side plates 41, 41 made of a thick plate of transparent acrylic resin are erected on both sides of the opening of the heat insulating box 2. The side plates 41, 41 have a substantially mountain shape in which the front and rear sides 41A, 41B are inclined so that the upper portions thereof are close to each other, and a stainless top plate 42 is provided between the upper ends of the side plates 41, 41B. It is screwed from the side via 43.

The top plate 42 has a mountain-shaped cross section along the shape of the side plates 41, 41, and the lower surface of the top plate 42 is provided with front and rear stainless steel upper support plates 44, 44, which are also made of stainless steel. A plate 46 is attached. The upper support plates 44, 44 are spaced apart from the lower surface of the top plate 42 by a predetermined distance, and the tips of the upper support plates 44, 44 are inclined downwards substantially along the inclination of the front and rear sides 41A, 41B of the side plate 41. A horizontally long fluorescent lamp 51 is housed and arranged on the lower surface of the reflector plate 46, and a ballast 52 for lighting the fluorescent lamp 51 is arranged on the upper surface.

On the other hand, rails 63, 63 are attached to the left and right sides of the front and rear opening edges of the heat insulating box 2, and the storage chamber 22 of the low temperature showcase 1 is provided between the rails 63, 63 and the top plate 42. Open in the front-back direction (openings 64, 6
4) Do. With such a configuration, the front and rear openings 64, 64 of the storage chamber 22 of the low temperature showcase 1 are located inwardly of the lower edge and open obliquely upward, and the rails 63, 63 are below the openings 64, 64. The front and rear side surfaces of the upper support plates 44, 44 and the reflection plate 46 located at the edges are provided with openings 64, 64.
It will be located at the upper edge of.

On the rail 63, a plurality of sliding door doors 73, ... Made of, for example, a transparent acrylic resin plate or transparent glass are slidably mounted and supported. In this case, in the embodiment, there are 8 doors 7 inside and 2 outside.
3, the upper portion of the door 73 supported inside is supported by the front and rear side surfaces of the reflection plate 46, and the upper portion of the door 73 supported outside is supported by the upper support plate 44.

Kick plates 26 and 26 having a large number of through holes 24 are attached to the front and rear of the lower end of the heat insulating box 2, and the heat insulating box 2 is located between the kick plates 26 and 26. A machine room 27 is formed below. Then, in the machine room 27 located below the high-order portion 13B, the compressor 111, the condenser and the blower for the condenser (both not shown), which constitute the refrigerant circuit of the refrigeration cycle together with the cooler 17, and the electrical equipment box. With 30 etc. installed,
The rear surface of the machine chamber 27 is openably and closably closed by a plurality of panels 36 to 38, and the compressor 111, the condenser and the like are located on the rear side of the panels 38 and 37. In addition, the panel 3
A plurality of slits 39 ... Are formed in 7, 38, and the electrical equipment box 30 is located on the rear side of the leftmost panel 36.

A gas-filled type thermostat 91 is attached to the electrical equipment box 30. The thermostat 91 has a contact 91A described later inside, and a tubular temperature-sensing portion 94 connected via a capillary tube 93. Refrigerant such as CFC is enclosed in the temperature sensing portion 94 and the capillary tube 93, and the contacts in the thermostat 91 are opened and closed based on the temperature sensed by the temperature sensing portion 94.

The capillary tube 93 of the thermostat 91 extends forward from the electrical equipment box 30 as shown in FIG. 2, penetrates through the bottom wall 13 of the heat insulating box body 2 and is drawn into the duct 12 below the bottom plate 11 for cooling. The temperature-sensing portion 94 at the tip of the inner box 6 passing through the side of the container 17 is arranged near the blower 19 so as to sense the temperature of the circulating cold air sucked into the blower 19. The thermostat 91 detects the temperature of the cold air sucked into the blower 19 by the temperature sensing unit 94, and for example, −
The temperature is raised to 20 ° C. to close the contact 91A, and the temperature is lowered to −22 ° C. to open the contact 91A.

Next, referring to FIG. 3, the motor (CM) 111M for driving the compressor 111 is connected to the contact point 112S of the magnet switch (CMG) 112 for the compressor, and
It is connected to the power supply AC1 of phase 200V. Further, overload relays (OLRs) 113 and 114 are provided on the U-phase and the W-phase of the motor 111M and the power supply AC1. And these overload relays 11
High-voltage switch 11 as an abnormality detecting means between 3 and 114
6 and the auxiliary relay (1X) 117 are connected in series. The high pressure switch 116 detects the discharge pressure of the compressor 111, opens the contact when the pressure rises to a predetermined abnormal high pressure, and returns (closes) to a normal value.

A defrost timer (DT) 118 is connected between the W phase and the U phase of the power supply AC1. The drain contact timer (T) is provided on the switching contact 118A of the defrost timer 118.
119, a normally open contact 117A of the auxiliary relay 117, a contact (TH) 91A of the thermostat 91, a delay timer (D) 121, and a series circuit of the magnet switch 112 for the compressor are connected, and the switching contact 118B is not connected. A magnet switch (DMG) 122 for frost is connected.

A series circuit of a normally closed contact 117B of the auxiliary relay 117 and a high pressure alarm lamp (CL) 123 as an alarm indicator is connected between the W phase and the U phase of the power source AC1, and the W phase and the U phase are connected. Transformer (TR) of high temperature inside alarm board (PCB) 124 as an abnormality detecting means between phases
126 is connected. Further, a series circuit of an internal high temperature alarm board 124 and an internal high temperature alarm lamp (RL) 127 as an alarm indicator is connected between the W phase and the U phase. The temperature inside the storage chamber 22 of the high temperature alarm board 124 is, for example, -5.
The contact is closed after a certain period of time due to abnormally high temperature such as ℃.

Further, the normally open contact of the switching contact 117C of the auxiliary relay 117 is connected between the inside high temperature alarm board 124 and the inside high temperature alarm lamp 127. Switching contact 1
The 17C normally closed contact is connected to the U phase, and the common contact is connected to the W phase via the auxiliary relay (2X) 131.
Further, a series circuit of the filter sensor (PTH) 132 of the condenser and a filter sine lamp 133 as an alarm display is connected between the W phase and the U phase of the power source AC1.
The normally closed contact of the switching contact 131A of the auxiliary relay (2X) 131 is connected between the filter sensor (PTH) 132 and the filter sine lamp 133.

The filter sensor 132 closes the contacts when the condenser filter is clogged with dust and the condenser temperature rises. The switching contact 131A
The normally open contact is connected to the U phase, and the common contact is connected to the W phase via the auxiliary relay (4X) 134. Also,
An auxiliary relay (5X) 136 as a power supply abnormality detection means is connected between the W phase and the U phase of the power supply AC1.

Next, referring to FIG.
One of the normally-open contacts 13A and 134B of the series of normally-open contacts 13A
4A and instant return type buzzer stop switch (SW1) 1
A series circuit of 37 and the auxiliary relay (3X) 138 is connected to the buzzer power supply AC2 of single-phase AC 100V. The buzzer stop switch 137 is connected in parallel with the normally open contact 138A of the auxiliary relay 138.
7 and the auxiliary relay 138 are connected in parallel to a series circuit of a normally closed contact 138B of the auxiliary relay 138 and an alarm buzzer 139.

Further, the auxiliary relay 1 is connected to the normally open contact 134A.
One of the 36 normally closed contacts 136A and 136B is connected in parallel. The normally open contact 1
34B is connected to an external abnormality alarm output circuit, and the normally closed contact 136B is connected to an external power failure alarm output circuit.

Next, the operation of the low temperature showcase 1 having the above configuration will be described. The high-voltage switch 116 is now closed, so the normally open contact 117A is closed and the defrost timer 118 is also closed to the contact 118A. Further, the inside high temperature alarm board 124 is also assumed to have the contacts opened. The power supply AC1 is applied, and the contact 91 of the thermostat 91
When A is closed, the magnet switch 112 is energized,
The contact 112S is closed and the motor 111M is energized.

As a result, when the compressor 111 is operated, the blower 19 is constantly operated by a circuit (not shown), so that the cool air cooled by the cooler 17 is inclined.
The inside of the duct 12 is blown up from C and the duct plate 9
It is discharged toward the upper part of the storage chamber 22 from the discharge port 9A at the upper end. The cool air that has circulated in the storage chamber 22 is sucked into the duct 12 from the suction port 8A at the upper end of the duct plate 8, and the blower 1
The circulation (represented by the broken line arrow in FIG. 2) returning to 9 is performed.

When the temperature of the sucked cold air detected by the thermostat 91 drops to -22 ° C due to such cooling, the contact 91A is opened and the contact 112S is opened, so that the motor 111M.
Will stop. Then, when the suction cold air temperature rises to −20 ° C., the contact 91A is closed again and the motor 111M is activated. As a result, the inside of the storage chamber 22 is cooled to the set temperature.

Here, when the discharge high pressure of the compressor 111 rises abnormally and the high pressure switch 116 opens, or when the overload current flows to the motor 111M and the overload relays 113 and 114 open, an auxiliary relay. 117 is not energized. Therefore, since the normally open contact 117A is opened, the operation of the motor 111M is prohibited, and the normally closed contact 117B is closed, so that the high pressure alarm lamp 123 is turned on.

Further, since the switching contact 117C closes to the normally closed contact, the auxiliary relay 131 is energized to switch the switching contact 131.
Since A closes to the normally open contact, the auxiliary relay 134 is energized. As a result, the normally open contact 134A of FIG. 4 is closed, so that the alarm buzzer 139 is energized and the alarm buzzer 139 is activated.
Is sounded. The high pressure alarm lamp 123 lights up and the alarm buzzer 139 rings, so that the user can see the compressor 111
Is informed that a high voltage abnormality has occurred. Further, since the normally open contact 134B is also closed, an alarm output is also provided to the external abnormality alarm output circuit. Therefore, it becomes possible to monitor the abnormality of the low temperature showcase 1 externally.

Next, when a failure occurs in the thermostat 91 or the like and the temperature in the storage chamber 22 becomes an abnormally high temperature of -5 ° C. and a certain period of time elapses, the internal high temperature alarm board 12
4 closes contacts. As a result, the internal high temperature alarm lamp 127 is turned on and the switching contact 117C is closed to the normally open contact, so that the auxiliary relay 131 is also energized.
After that, the alarm buzzer 139 is sounded similarly to the above.

Next, when the filter of the condenser is clogged, the filter sensor 132 is closed. As a result, the filter sine lamp 133 lights up and the switching contact 131A is closed to the normally closed contact.
The auxiliary relay 134 is also energized. After that, the alarm buzzer 139 is sounded similarly to the above.

Next, when the power source AC1 is disconnected due to the outlet of the low temperature showcase 1 being unplugged, power failure, or the like, the auxiliary relay 136 is de-energized. This closes the normally open contact 136A in FIG.
Since the circuit of FIG. 4 is connected to the power supply AC2 for buzzer different from the power supply AC1 for power, the alarm buzzer 139
Is energized, and an alarm buzzer 139 is sounded. The alarm buzzer 139 sounds to inform the user that the power supply AC1 has been disconnected. Further, since the normally open contact 136B is also closed, an alarm output is also output to the external abnormality alarm output circuit. Therefore, it becomes possible to monitor the power supply abnormality of the low temperature showcase 1 externally.

Even if a plurality of the above abnormalities occur at the same time, the respective lamps light up and the alarm buzzer 139 sounds. Here, when the user confirms the above alarm and pushes (closes) the buzzer stop switch 137, the auxiliary relay 1
38 is energized, the normally open contact 138A is closed, whereby the auxiliary relay 138 self-holds and the normally closed contact 138B is opened, so that the alarm buzzer 139 stops ringing. The lamps in FIG. 3 continue to light.

Then, the abnormality is eliminated and the auxiliary relay 13
4 or 136 is de-energized and normally open contacts 134A, 1
When 34B or 136A, 136B is opened, the auxiliary relay 138 is de-energized, and the circuit of FIG. 4 returns to the initial state.

Although the present invention is applied to the low temperature showcase in the embodiments, the present invention is not limited to this, and the present invention is effective for various cooling devices such as refrigerators and air conditioners.

[0043]

As described in detail above, according to the present invention, a plurality of abnormality detecting means for detecting a plurality of abnormalities occurring in the cooling device are provided, and when the abnormality is detected, the alarm indicators are respectively turned on, and Since the alarm buzzer sounds, various abnormalities occurring in the cooling device can be notified to the user. Further, since the alarm indicator is incorporated in the operation circuit of the cooling device, there is no restriction on installation as in the conventional case.

In particular, the alarm indicator is connected to the power source for power,
Since only the alarm buzzer is connected to another power source for the buzzer, the number of relays can be reduced compared to connecting all the alarm indicators to a power source different from the power source for the power, and the alarm buzzer is also a separate power source. Therefore, by providing the power supply abnormality detecting means for detecting the abnormality of the power supply for power supply as in the second aspect of the present invention, it becomes possible to give an alarm about the power supply abnormality such as when the power supply for power supply is disconnected.

A switch is provided in the power source for the buzzer as in the third aspect of the invention, means for stopping the alarm buzzer sounding based on the operation of the switch, and returning to the initial state upon elimination of the abnormality. If provided, the alarm indicator lights up due to an abnormality of the cooling device, and after the alarm buzzer sounds and the user confirms the abnormality, only the alarm buzzer will stop ringing with the switch, You will be able to deal with it. Since the alarm buzzer stops ringing automatically when the abnormality is resolved, usability is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a low temperature showcase to which the present invention is applied.

FIG. 2 is a vertical sectional side view of a low temperature showcase to which the present invention is applied.

FIG. 3 is an electric circuit diagram of a low temperature showcase to which the present invention is applied.

FIG. 4 is an electric circuit diagram of a low temperature showcase to which the present invention is also applied.

[Explanation of symbols]

 1 Low Temperature Showcase 91 Thermostat 91A Contact 111M Motor 116 High Voltage Switch 124 High Temperature Inside Alarm Board 132 Filter Sensor 136 Auxiliary Relay 137 Alarm Stop Switch 138 Auxiliary Relay 139 Alarm Buzzer AC1 Power Supply AC2 Buzzer Power Supply

Claims (3)

[Claims] 1. A power source for power to which a motor of a compressor of a cooling device is connected, a plurality of alarm indicators connected to the power source for power, and a plurality of abnormalities occurring in the cooling device are detected to detect the abnormality. A plurality of abnormality detecting means for respectively lighting the alarm indicators, an alarm buzzer connected to a power source for a buzzer different from the power source for power, and the alarm buzzer when any of the abnormality detecting means detects an abnormality. An alarm device for a cooling device, comprising: 2. A power supply abnormality detecting means for detecting an abnormality of a power supply for power supply, and a means for ringing an alarm buzzer when the power supply abnormality detecting means detects an abnormality. Alarm device for cooling system. 3. A power supply for a buzzer is provided with a switch, and means for stopping the ringing of the alarm buzzer based on the operation of the switch and returning to the initial state based on the elimination of the abnormality is provided. The alarm device for the cooling device according to claim 1.