JP2001272159A - Cooling unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a maintenance-free cooling unit in which both promotion of evaporation of drain water and an efficient cooling of a compressor can be realized. SOLUTION: A first blower 33a is cooperatively operated with ON-OFF control of a compressor 31, a second blower 33b is operated continuously, the compressor 31 being operated is cooled by the first blower 33a is cooled and evaporation of drain water on an evaporation pan 34 is promoted by the second blower 33b. In addition, the first, second and third wire condensers 32a, 32b and 32c are applied to cause the dusts to pass without being adhered to these condensers, resulting in that a filter for use in preventing adhesion of dusts can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling unit mainly used for a showcase.

[0002]

2. Description of the Related Art A refrigerated / frozen showcase has a machine room at a lower portion of a case body in which products are displayed, and a cooling unit having a compressor, a condenser, a blower and the like is housed in the machine room. I have. On the other hand, an evaporator connected to the compressor and the condenser of the cooling unit via a refrigerant pipe is provided on the case body side, and the inside of the case body is cooled by the evaporator. The cooling unit also has an evaporating dish, in which defrost water, dew water, and the like (drain water) generated and adhered to the evaporator and falling are collected via a drain pipe. Further, the blower sucks the outside air into the machine room, blows the outside air to the condenser to exchange heat, and also promotes the evaporation of the drain water of the evaporating dish by this air flow, and cools the compressor. .

[0003] As a method of operating the blower, there are a) a method linked to ON / OFF control of the compressor, and a method b) a continuous operation. Also, a large-sized showcase is known in which a cooling unit is provided with a plurality of blowers. Further, a fin condenser is generally employed as a condenser.

[0004]

However, in a cooling unit having a plurality of blowers, conventionally, each blower has been uniformly controlled by one of the operation methods (1) and (2). Therefore, in the case of employing the operation method a), since air is not blown to the evaporating dish when the compressor is stopped, the evaporation amount of the drain water is reduced, and a situation in which the drain water overflows from the evaporating dish may occur. occured. On the other hand, when the operation method of the above item b) is employed, although the evaporation of the drain water is promoted, there is a problem that the blowing to the stopped compressor is wasted and the running cost such as power consumption increases. .

Further, when a fin capacitor is used, dust easily enters the gaps between the fins and adheres to the fins. Therefore, not only a filter for preventing the dust but also maintenance such as replacement of the filter is required. They monitored the temperature of the refrigerant inside the tank and issued a time to replace the filter.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a maintenance-free cooling unit which can realize both promotion of drain water evaporation and efficient cooling of a compressor.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a compressor, a condenser,
In a cooling unit provided with a blowing means for exchanging air with a condenser and an evaporating dish for receiving and evaporating drain water, the blowing means operates the compressor in conjunction with ON / OFF control of the compressor. It is characterized by having a first blower for cooling and a second blower for continuously operating to evaporate the drain water in the evaporating dish. According to the cooling unit of the present invention, the first blower is turned ON / OFF of the compressor.
In conjunction with the control, the first and second blowers are independently controlled such that the second blower is continuously operated, and the former cools the compressor and the latter promotes the evaporation of the drain water in the evaporating dish. Can be made.

According to a second aspect of the present invention, in the first aspect of the present invention, the condenser is a wire condenser. According to the cooling unit of the present invention, since the dust passes without adhering to the condenser by using the wire condenser as the condenser, the filter for preventing the adhesion of the dust and the replacement thereof are not required.

[0009]

1 to 4 show a showcase provided with a cooling unit according to the present invention. FIG. 1 is a front view of the showcase, FIG. 2 is an explanatory side sectional view of the showcase, and FIG. FIG. 4 is a perspective view showing an embodiment of the cooling unit, and FIG. 4 is an explanatory plan view of the arrangement of the cooling unit.

The showcase 1 is relatively large and has a case body 10 having a plurality of shelves 11 on which products are displayed.
And a machine room 20 provided at a lower portion of the case main body 10. The machine room 20 includes a cooling unit 30 described later.
Is stored. The case body 10 is basically composed of a box body 10a made of a heat insulating material, and a door body 10b made of a transparent glass plate that opens and closes an open front part of the box body 10a in a sliding door manner. I have.

As shown in FIG. 2, an evaporator 12 for cooling the inside of the case main body 10 and a cool air generated by the evaporator 12 are provided at an upper rear portion in the case main body 10.
An in-compartment blower 13 for convection inside and a drain plate 14 for receiving drain water such as defrost water and dew water generated and adhered to and dropped on the surface of the evaporator 12 are provided. The upper end of a drain tube 15 is connected to the drain plate 14, and the drain tube 15 extends downward through the back of the case body 10, enters the machine room 20, and terminates above an evaporating plate 34 described later. I have.

The cooling unit 30 in the machine room 20 includes a compressor 31, a first wire condenser (hereinafter referred to as "first condenser") 32a as three condensers, and a second wire condenser (hereinafter referred to as "second condenser"). ) 32b, a third wire condenser (hereinafter, “third condenser”) 32c, and a first blower 33a and a second blower 33b as blowers.
, An evaporating dish 34, and an expansion valve (not shown). The compressor 31, the first, second and third condensers 3
The expansion valves 2a, 32b, 32c, and the expansion valve, and the evaporator 12 on the case body 10 side are connected by a refrigerant pipe (not shown) to form a refrigeration circuit. Further, the first and second blowers 33a and 33b include a motor and a fan as is well known. Further, drain water is collected on the evaporating dish 34 via the drain pipe 15.

Next, the arrangement of each component of the cooling unit 30 will be described with reference to FIG. 4, but the directions are based on FIGS. That is, the front and rear in FIG. 4 correspond to the front and rear in FIG.
4 correspond to the right and left in FIGS. 1 and 2, respectively. In the cooling unit 30, the compressor 31 is at the left rear, the first condenser 32a is at the right rear, the second condenser 32b and the evaporating dish 34 are at the right front, and the third condenser 32c is at the left front. It is arranged. Furthermore, the first blower 33a is disposed between the compressor 31 and the third condenser 32c so as to direct the compressor 31, and the second blower 33b directs the second condenser 32b and the evaporating dish 34 forward in the center in the left and right direction. It is arranged to be.

The front and rear wall plates 20a, 20b, 20c and 20d constituting the machine room 20 are provided.
The first and second blowers 33a, 3b are provided on the rear wall plate 20b.
A large number of slits 21 for taking in air from the outside to the inside and exhausting from the inside to the outside in the machine room 20 accompanying the operation of 3b
The left and right wall plates 20c and 20d are not provided with such openings as slits.

When the fan is rotated by the motor, the first blower 33a takes in air from the outside of the machine room 20 and blows the outside air to the compressor 31. Here, the air sucked from the outside into the first blower 33a exchanges heat with the third condenser when passing through the third condenser 32c. Further, the air blown to the compressor 31 cools the compressor 31, and this air is thereafter discharged outside the rear of the machine room 20. The above first blower 3
3a is ON / OFF controlled so as to interlock with the ON / OFF control of the compressor 31, whereby the stopped compressor 31
There is no needless power consumption to blow air to the air.

On the other hand, the second blower 33a takes in outside air from the front in the left and right center of the machine room 20 by rotation of the motor, and blows the outside air rightward. This outside air passes between the second condensers 32b and passes through the second condensers 32b.
b), and promotes the evaporation of the drain water on the evaporating dish 34. The blown air is divided into front and rear parts and discharged to the outside of the machine room 20 because there is no opening in the right side wall plate 20c of the machine room 20, and the rearward air therein exchanges heat with the first condenser 32a. And then exhausted. The above-described second blower 33a is operated continuously, whereby air is constantly blown to the evaporating dish 34, and the evaporating action does not stop.

The first, second and third capacitors 32
Since a, 32b, and 32c are all wire capacitors, dust passes without adhering, and a filter for preventing adhering of dust is not required, and maintenance is free.

[0018]

As described in detail above, according to the first aspect of the present invention, the first blower is linked to the ON / OFF control of the compressor, and the second blower is continuously operated. Independently controlling the first and second blowers,
The former can cool the compressor, and the latter can promote the evaporation of the drain water in the evaporating dish. Thus, waste of power consumption such as blowing air to the stopped compressor can be reduced, running costs can be suppressed, and overflow of drain water from the evaporating dish can be reliably prevented.

According to the second aspect of the present invention, since a wire condenser is used as a condenser to pass dust without adhering to the condenser, a filter for preventing adhesion of dust required in the case of a fin condenser. In addition, it is not necessary to perform maintenance such as filter replacement and the like, and temperature management for determining a filter replacement time.

[Brief description of the drawings]

FIG. 1 is a front view of a showcase.

FIG. 2 is an explanatory side sectional view of a showcase.

FIG. 3 is a perspective view of a cooling unit.

FIG. 4 is an explanatory plan view of an arrangement configuration of a cooling unit.

[Explanation of symbols]

1 ... showcase, 10 ... case body, 12 ... evaporator,
14: drain pipe, 20: machine room, 30: cooling unit,
31 ... Compressor, 32a ... First wire condenser, 32b
... 2nd wire condenser, 32c ... 3rd wire condenser, 33a ... first blower, 33b ... second blower, 34 ...
Evaporating dish

Claims (2)

[Claims] 1. A cooling unit comprising: a compressor, a condenser, a blower for exchanging heat between air and a condenser, and an evaporating dish for receiving and evaporating drain water, wherein the blower includes a compressor. A cooling unit comprising: a first blower that cools a compressor in conjunction with ON / OFF control of the machine; and a second blower that continuously operates to promote evaporation of drain water in the evaporating dish. . 2. The cooling unit according to claim 1, wherein the condenser is a wire condenser.