JPH0531508Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a refrigeration device installed in a freezer or the like, and particularly relates to a refrigeration device equipped with a damper that can be opened and closed at a cold air outlet.

(b) Conventional technology For example, Japanese Utility Model Application Publication No. 57-6982 discloses a damper made of a plate with good thermal conductivity that can be opened and closed near the air outlet side of a cooler, and an electric heater that is energized during defrosting. A shaft is installed internally to rotatably support the damper, and when defrosting, the damper is closed and the electric heater is energized to dissolve frost or ice pieces that have adhered to the air outlet side of the cooler, the damper, and the shaft. A refrigeration device is disclosed.

(c) Problems to be solved by the invention In the above-mentioned conventional technology, dew is generated on the inner surface of the damper during defrosting operation, and the dew is transmitted downward and drips, but after the heating of the cooler is finished, When only the cooler is operated and the blower starts operating later than the cooler, the dew formed on the inner surface of the damper in the closed state is transmitted downward, and the dew that reaches the lower end of the damper is cooled. Freezing occurs at the lower end due to a decrease in the internal temperature of the refrigeration equipment due to operation of the refrigerator or due to cold air inside the refrigerator, and this freezing gradually grows downward and becomes icicle-shaped. Then, before the blower starts operating, the ice reaches the upper part of the lower damper, and both the upper and lower dampers are connected by the ice, and the blower starts operating and the wind pressure is applied to the damper. Even if the cold air is frozen, the damper cannot be rotated upward and the cold air outlet cannot be opened. The present invention aims to solve the above problems.

(d) Means for solving the problems In order to solve the above problems, the present invention provides a cooler that is cooled during cooling operation and draining operation and heated by a defrosting device during defrosting operation. A blower is provided for circulating cold air, and a cold air outlet is provided so as to be freely openable and closable in the longitudinal direction. A refrigeration system comprising at least two upper and lower dampers that open the outlet and rotate downward due to their own weight to close the cold air outlet during defrosting operation and draining operation when the blower is stopped, The cooler is provided in the longitudinal direction directly under the upper and lower dampers, the inner edge thereof is close to the air outlet surface of the cooler, and the outer edge is located outward from the lower end of the damper in the closed state. first and second dew receiving plates that are sloped so that inner edges adjacent to the dew receiving plates are lower; and a heat generating device provided on the lower surface of each dew receiving plate to heat each dew receiving plate at least when the blower is stopped. The refrigeration apparatus is provided with a body, and has an overlap portion overlapping an upper part of the lower damper formed on an outer edge of the first dew receiving plate located above the lower damper.

(E) Function At least during defrosting operation and when the blower is stopped during draining operation after defrosting operation, the dew receiving plate acts as a directing plate that directs the dew dripping from the damper toward the cooler, while the dew receiving plate generates heat. Because the dew is heated by the body, even if the dew that reaches the lower end of the damper freezes and gradually grows to become an icicle, the high temperature of the dew receiving plate melts the lower end of the icicle and causes the icicle to form. It acts to prevent the connection between the dew receiving plate and the damper.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

1 shown in Figures 1 and 2 is a refrigeration device such as a cooling coil that is suspended from the ceiling wall of a prefabricated freezer, etc. It has a rectangular cold air outlet 2 on the front and a cold air intake 3 on the back. A duct-shaped metal case 4 with an open bottom, a plurality of beams 5 supporting the case and fixed to the top wall of the freezer, and a bottom of the case 4 that can be opened and closed so as to cover the bottom opening. The case 4 is equipped with a dew pan 6 and defrosting heaters 7a and 7b, which are defrosting devices, on the air inlet surface and bottom surface, and with the air outlet surface facing the cold air outlet 2.
It is composed of a plate fin type cooler 8 disposed inside and an axial flow type blower 9 disposed adjacent to the cold air suction port 3. Then, as shown by the arrow in FIG. 1, the cold air inside the refrigerator is passed through the case 4 by the blower 9, and at this time, it is exchanged with the cooler 8 and cooled down to a predetermined temperature.

Reference numeral 10 denotes a metal blow-off duct which is detachably fixed to the case 4 so as to be located in front of the cold-air blow-off port 2; Two dampers, upper and lower, are provided, and these dampers 11a and 11b are formed by slightly bending a metal plate with good heat conduction, such as aluminum, and are rotatably supported by a shaft 11A. During the cooling operation, each damper 11a, 11b is opened by the wind pressure from the blower 9, and cold air is discharged into the warehouse.

Also, the lower end of the damper 11a and the lower damper 11
A gap D is formed between the upper end of b, and a first dew receiving plate 12 is provided in the longitudinal direction directly below the upper damper 11a in this gap D to partition the cold air outlet 2 into upper and lower areas 2a and 2b. It is being Here, the first dew receiving plate 12 is inclined downward toward the air outlet surface of the cooler 8 as shown in FIG. It consists of an overlap part 12B that extends downward from the front end and whose lower end overlaps the upper front surface of the lower damper 11b, and is made of a metal plate with good thermal conductivity such as aluminum. Further, an electric heater _H1 is attached to the lower surface of the inclined surface 12A as a heating element that generates heat when energized during defrosting operation. Further, a second dew receiving plate 14 is attached in the longitudinal direction directly below the lower damper 11b. The second dew receiving plate 14, like the first dew receiving plate 12, is inclined downward toward the air outlet surface of the cooler 8, and has an inner edge close to the cold air outlet surface, and extends downward from the front end thereof. The flange 14B is bent and attached to the lower part of the blow-off duct 10. Also, the inclined surface 14A
An electric heater H ₂ is attached to the lower surface of the plate as a heating element, similar to the first dew receiving plate 12 . Furthermore, the second
The exposure plate 14 may also be used as the lower surface 10a of the blow-off duct 10.

Further, FIG. 4 shows a schematic operating circuit diagram of the refrigeration system, in which 20 is a three-phase AC power source, and 21, 22, 23 are a compressor, a blower motor, an electric heater 7a, and 7b is a defrosting heater. Further, 24 is a defrosting timer device;
M is a defrosting timer motor, and 24S ₁ and 24S ₂ are first and second defrost switches that are normally closed or normally open, respectively.
Here, 25 and 26 are the first defrost switch 2, respectively.
_4S1 is a relay for the compressor and a solenoid valve for controlling refrigerant, 27S is a protection thermostat, 27 is an overload relay for the compressor, 28 is a high/low pressure switch,
S is a thermostat for controlling the temperature inside the refrigerator which controls the supply of electricity to the solenoid valve 26. Further, 28H and 28L are a high pressure side switch and a low pressure side switch, respectively, of the high and low pressure switch. Furthermore, T is a delay timer, 30 is a relay for the blower motor, 31 is an overload relay for the blower, TS is a normally open delay timer switch, and 32 is a defrost end sensing thermostat. It is composed of a first contact 32a on the timer T and blower motor relay 30 side, a second contact 32b on the defrost recovery solenoid coil 33 side, and a switching contact piece 32c. Further, 34 is a defrosting heater relay, 35 is a thermostat for preventing abnormal overheating, and BH and DH are a box heater and a dew pan heater, respectively, which are always energized. Furthermore, 30S ₁ is a normally closed first relay of the blower motor relay 30, to which electric heaters H ₁ and H ₂ are connected.

Note that a relay switch 25S of the compressor relay 25 is connected between the three-phase AC power supply 20 and the compressor 21,
A compressor overload relay 27 is provided, and a second relay switch 30S 2 of the blower motor relay 30 is provided between the three-phase AC power supply 20 and the blower motor _22.
and a blower overload relay 31 are provided.
A relay switch 34S of a defrosting heater relay 34 is provided between the phase AC power supply 30 and the defrosting heater 23.

Hereinafter, the operation of the above-mentioned refrigeration system will be explained.
The defrosting timer motor 24M is continuously energized from the time the power is turned on to the refrigeration equipment, and the first defrosting switch _24S1 is on and the second defrosting switch is on until the preset defrosting time is reached. _24S2 is turned off, the compressor relay 25 is energized via the compressor overload relay 27 and the high/low pressure switch 28, the relay switch 25S is turned on, and the compressor 21 is operated.
Also, at this time, the refrigerant control solenoid valve (hereinafter referred to as solenoid valve) 26 is energized and controlled by turning on and off a thermostat (hereinafter referred to as thermostat) S for controlling the temperature inside the refrigerator. For example, when the temperature inside the refrigerator decreases due to cooling operation and reaches the lower limit temperature, the thermostat S is turned off and the solenoid valve 26 is de-energized and closed. When the refrigerant pressure decreases, the low pressure side switch 28L of the high/low pressure switch 28 is turned off, and the compressor relay 25
is de-energized, the relay switch 25S is turned off, and the compressor 21 stops operating. Then, when the temperature inside the refrigerator gradually rises and reaches the upper limit temperature, the thermostat S is turned on, and the solenoid valve 26 is energized and opens.
The liquid refrigerant flows and the low pressure side switch 28L is turned on.
The compressor relay 25 is energized, and the compressor 21 starts operating. Thereafter, the operation of the compressor 21 is similarly controlled by turning the thermostat S on and off, and the temperature inside the refrigerator is kept substantially constant.

In addition, the defrost end sensing thermostat (hereinafter referred to as a defrosting thermostat) 32 is set to the first position during normal cooling operation.
Since the contact 32a is closed, the delay timer T is continuously energized, and the delay timer switch TS is on, the blower motor relay 30 is energized. Then, the second relay switch _30S2 is turned on to energize the blower motor 22, and the blower 9 is operated to supply cold air from the refrigeration system 1 into the refrigerator.
Further, the first relay switch 30S ₁ is off, and no electricity is applied to the electric heaters H ₁ and H ₂ .

Furthermore, since the second defrost switch _24S2 is off, the defrost return solenoid coil 33 and the defrost heater relay 34 are de-energized, and the relay switch 34S is off, so the defrost heater 23 is not energized. No power is supplied.

When time elapses with the cooling operation and the time preset in the defrosting timer 24 has elapsed, the defrosting timer motor 24M operates, the first defrosting switch _24S1 is turned off, and the second defrosting switch is turned off. 24S ₂ is turned on. When the first defrosting switch _24S1 is turned off, the compressor relay 25 is de-energized and the compressor 21 is stopped regardless of whether the thermostat S is turned on or off. Further, the blower motor relay 30 is also de-energized, and the blower 9 stops operating. and,
When the wind pressure from the blower 9 disappears, the upper damper 11a and the lower damper 11b of the refrigeration device 1 rotate downward due to their own weight, and the cold air outlet 2 is closed.
Further, the first relay switch 30S ₁ of the blower motor relay 30 is turned on, and the electric heaters H ₁ and H ₂ are both energized and generate heat, thereby heating the first and second dew receiving plates 12 and 14.

Further, when the _second defrosting switch 24S2 is turned on, the defrosting heater relay 34 is energized, the relay switch 34S is turned on, and the defrosting heater 23 is energized. The cooler 8 is heated by heat conduction and radiant heat from the defrosting heater 23. Due to the heating of the cooler 8, the ice and frost formed on the cooler 8 during the cooling operation gradually melts, and the defrosting heater 23 and the cooler 8
The dampers 11a and 11b on both the upper and lower sides are warmed from the inside by radiant heat and warm air. Therefore, although steam from the cooler 8 and the like condenses on the inner surfaces of the dampers 11a and 11b to generate dew, this dew is transmitted downward along the inner surfaces without freezing. The dew dripping from the lower ends of the dampers 11a and 11b falls onto the first and second dew receiving plates 12 and 14, which are heated by the electric heaters _H1 and _H2 , and is transferred to the inclined surfaces 12A and 14A without freezing. The water is transmitted inward and falls from the inner edge to the dew pan 6 where it is drained. Note that since the dew generated on the inner surface of the upper damper 11a falls onto the first dew receiving plate 12, the lower damper 11b
It cannot be transmitted to the outside surface of the body.

As the defrosting operation of the cooler 8 progresses, the temperature of the cooler 8 gradually rises, and when the defrosting thermometer 32 detects that the defrosting return temperature has reached, for example, 10°C, the defrosting thermometer 32 is switched. The contact piece 32c is the second contact point 32
Solenoid coil 3 for defrosting return switches to b.
3 is energized. By energizing this coil 33, the defrosting timer 24 operates, and the defrosting timer motor 24M starts counting anew, and the first
The defrost switch _24S1 is turned on and the second defrost switch _24S2 is turned off.

When the first defrosting switch 24S ₁ is turned on, the compressor relay 25 is energized, the compressor 21 starts operating, and the refrigerant flows to the cooler 8. In addition, since the switching contact 32c of the defrosting thermostat 32 is closed to the second contact 32b, the blower motor relay 30 is de-energized and the blower 9 remains stopped, and water draining operation starts after the defrosting operation is completed. be done. Further, the delay timer T also does not start operating. Further, the defrosting heater relay 34 is de-energized, the relay switch 34S is turned off, the defrosting heater 23 is de-energized, heat generation is stopped, and the cooler 8 is no longer heated.

By circulating the refrigerant to the cooler 8 by operating the compressor 21, the temperature of the cooler 8 and the refrigeration system 1 are increased.
When the internal temperature drops to a predetermined temperature, for example -8°C, the switching contact piece 32c of the defrosting thermostat 32 switches to the second
The contact 32b is switched to the first contact 32a, and the delay timer T is energized. At this time, since the delay timer switch TS of the delay timer T is off, the blower motor relay 30 is de-energized and the blower 9 is not operated. Then, the first relay switch 30S ₁ continues to be turned on, the electric heaters H ₁ and H ₂ are energized, and the first and second dew receiving plates 12 and 14 are heated to 0°C.
The dew that drips onto the dew receiving plates 12 and 14 flows onto the sloped surfaces 12A and 14A without freezing.
and drips into the dew pan 6. In addition, both the upper and lower dampers 11 due to the temperature drop in the refrigeration device 1 and the temperature inside the refrigerator.
The dew that reaches the lower ends of a and 11b freezes and gradually becomes icicle-shaped, but the lower ends of the dew reach the first and second dew receiving plates 1.
It is warmed up by 2.13 and never freezes.

When a predetermined period of time, for example two minutes, has elapsed since the start of power supply to the delay timer T, the delay timer T counts up and the delay timer switch TS is turned on.
When the delay timer switch TS is turned on, the draining operation ends, the blower motor relay 30 is energized, the blower 9 starts operating, and the wind pressure from the blower 9 causes both the upper and lower dampers 11a and 11b to move upward. As it rotates, the cold air outlet 2 is opened, and the cold air that has undergone heat exchange in the cooler 8 is blown out into the refrigerator. Further, the first relay switch 30S ₁ is turned off, the electric heaters H ₁ and H ₂ are de-energized, and the heat generation stops.

Thereafter, the temperature inside the refrigerator is kept approximately constant by controlling the operation of the compressor 21 by turning on and off the thermostat S, and when a predetermined period of time has elapsed since the defrost timer 24 started counting, the cooler 8 is defrosted again. Driving begins.

Therefore, the first and second dew receiving plates 1 are provided directly below the upper damper 11a and directly below the lower damper 11b, respectively.
2, 14 are arranged, the inner edges of these dew receiving plates 12, 14 are close to the air outlet surface of the cooler 8, and the outer edges thereof are close to the air outlet surface of the cooler 8, and the outer edges thereof are close to each damper 11 when each damper 11a, 11b is closed.
Since it is located outward from the lower ends of a and 11b,
Heating of the cooler 8 is started and defrosting operation begins.
The warm air flowing out of the cooler 8 is retained in the lower area below the first dew receiving plate 12, which acts as a baffle plate, and convects in the vertical direction.
The amount of warm air that comes into contact with the inner surface of the lower damper 11b increases, the temperature of the lower damper 11b increases faster, and if ice and frost is formed on the lower damper 11b, the ice and frost can be quickly melted. Also, during defrosting operation, dew generated on the inner surfaces of both the upper and lower dampers 11a, 11b is transmitted downward, drips onto the first and second dew receiving plates 12, 14, is guided to the dew receiving plate 6, and is removed from the lower damper 11b. Dew from the upper damper 11a does not drip onto the outer surface. In addition, the first and second dew receiving plates 1
2 and 14 are electric heaters after defrosting operation starts.
Since the dew is heated by H ₁ and H ₂ , even if the internal temperature is below 0°C, the dew that has dripped onto each of the dew catch plates 12 and 14 can flow along the slopes of the dew catch plates 12 and 14 and drip onto the dew catch plate 6. .

Also, the period from when the heating of the cooler 8 is stopped and the defrosting operation is finished and the operation of the compressor 21 is started until the delay timer T is activated and a predetermined period of time has elapsed and the blower 9 starts operation. Draining operation time, electric heater
Since H ₁ and H ₂ are continuously energized and the first and second dew receiving plates 12 and 14 are warmed, even if the temperature of both the upper and lower sections 2a and 2b of the refrigeration equipment 1 decreases, both the upper and lower sections are heated. The dew dripping from the dampers 11a, 11b onto the first and second dew receiving plates 12, 14 flows along the slopes 12A, 14A without freezing and is guided to the dew receiving plate 6, while the dampers 11a on both the upper and lower parts , the lower end of the icicle that gradually grows from the lower end of 11b is an electric heater.
First and second dew receiving plates 1 heated by H ₁ and H ₂
The dampers 11a and 11b are melted by heat transfer from the dampers 2 and 14, and both dampers 11a and 11b are maintained in an openable state, and when the blower 9 starts operating, each damper 11
a, 11b can be smoothly rotated upward without resistance to open the cold air outlet 2.

In the above embodiment, the dampers 1 in two stages, upper and lower,
1a and 11b has been described, however, even in a refrigeration system having more than two stages of dampers, for example, three or four stages, a dew receiving plate equipped with a heating element such as an electric heater directly under each damper may be used. By providing this, it is possible to obtain the same effects as in the above embodiment. Further, even if the electric heaters H ₁ and H ₂ are constantly energized, the same effects as in the above embodiment can be obtained.

Furthermore, FIG. 5 shows an operation transition diagram of the refrigeration system, and energization of the damper electric heater continues from the start of defrosting operation until the start of operation of the blower. Furthermore, Fig. 6 shows an operation transition diagram when the first and second refrigeration units are operated in parallel, and even if the defrosting operation of either refrigeration unit ends earlier, the blower operation will start at the same time. At that point, the electricity supply to the damper electric heater is stopped, and the same effect as described above can be obtained.

(g) Effects of the invention Since the invention is a refrigeration system configured as described above, during defrosting operation, warm air warmed by radiant heat from the lower part of the cooler is absorbed by the action of the first dew receiving plate forming an overlap part. This prevents leakage into the warehouse and accumulates in the area below the dew receiving plate.
The temperature of the damper below the dew catch plate can be raised quickly, and as a result, it is possible to prevent the dew generated on the inner surface of the damper from freezing. Because the dew is heated by the dew receiving plate, the dew that drips onto the dew receiving plate flows without freezing, and the dew can be disposed of smoothly.
In addition, the dew receiving plate is intermittently warmed by the heating element even during the draining operation until the blower starts operating after the defrosting operation, so even if the temperature inside the refrigeration equipment gradually decreases, the dew receiving plate remains warm. The dropped dew flows without freezing, and the lower end of the icicle that grows on the lower end of the damper melts as it approaches the upper surface of the dew receiving plate, so that the lower end of the damper and the dew receiving plate are bonded with ice. the damper is maintained in an openable state;
When the blower starts operating, the damper can be smoothly rotated upward by the wind pressure to open the cold air outlet.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Figure 1 is a vertical sectional view taken along the line C-C in Figure 2, Figure 2 is a schematic perspective view of the refrigeration system, Figure 3 is an enlarged view of the main parts of Figure 2, and Figure 4 is a schematic operating circuit of the refrigeration system. FIG. 5 is an operation transition diagram of the refrigeration system, and FIG. 6 is an operation transition diagram when the first and second refrigeration systems are operated in parallel. 1... Refrigeration device, 2... Cold air outlet, 7a, 7
b...Defrosting heater, 8...Cooler, 9...Blower, 11a...Upper damper, 11b...Lower damper, 12...First dew receiving plate, 14...Second dew receiving plate,
H ₁ , H ₂ ... electric heater.

Claims (1)

[Scope of utility model registration request] A cooler that is cooled during cooling operation and draining operation and heated by a defrosting device during defrosting operation, a blower installed for cold air circulation, and a cold air outlet that opens and closes in the longitudinal direction. It is freely provided, and during cooling operation, it rotates upward due to the wind pressure as the blower operates to open the cold air outlet, and when the blower is stopped and is in defrosting operation or draining operation, it is rotated upward by its own weight. In a refrigeration system comprising at least two stages of dampers that rotate downward to close the cold air outlet, the dampers are provided in the longitudinal direction directly below the upper and lower dampers, and the inner edge thereof is connected to the air outlet of the cooler. located close to the surface and whose outer edge is located outward from the lower end of the damper in the closed state,
first and second dew receiving plates that are sloped so that inner edges near the cooler are lower; and a first and second dew receiving plate provided on the lower surface of each dew receiving plate to prevent each dew receiving plate from at least when the blower is stopped. What is claimed is: 1. A refrigeration system comprising: a heating element for heating; and an overlapping portion overlapping an upper part of the lower damper is formed at an outer edge of the first dew receiving plate located above the lower damper.