JP2000081274A - Evaporating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporating device which can improve maintenance workability even if a plurality of evaporating dishes are arranged at upper and lower locations to increase evaporative power. SOLUTION: A plurality of evaporating dishes 17 to 20 are arranged at upper and lower locations, and drainage received by the evaporating dish 17 at the upper location is allowed to sequentially overflow into the evaporating dishes 18 to 20 or a drainage layer at the lower locations through detachable overflow pipes 21A to 24B, whereby the drainage is evaporated at multiple stages. Further, a pipe stopper 33 for securing each of the detachable overflow pipes 21A to 23B is arranged on an internal surface of each of the overflow pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporator for receiving and draining drain water from a low-temperature showcase or a refrigerator.

[0002]

2. Description of the Related Art Conventionally, a low-temperature showcase or a refrigerator of this type receives defrost water (drain water) of a cooler in a machine room as disclosed in Japanese Patent Publication No. 5222711 (F25D21 / 14). The evaporating dish is configured to evaporate defrost water by being heated by an electric heater or a pipe through which a high-temperature refrigerant (hereinafter, referred to as a hot gas) discharged from a compressor flows. I was

[0003]

However, when the amount of defrost water increases in summer or the like (about 27 liters of defrost water is generated daily in a normal low-temperature showcase),
There is a problem in that the evaporating ability cannot keep up and water overflows from the evaporating dish. Therefore, if a plurality of evaporating dishes are set up and down, and the defrosting water is received and evaporated in each evaporating dish, the evaporating capacity of the defrosting water increases, but various foreign substances are mixed in the defrosting water. Since the foreign matter causes dirt or clogging of each evaporating dish, maintenance such as cleaning becomes extremely complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and it is desirable to install a plurality of evaporating dishes up and down to increase the evaporating capacity and improve maintenance workability. It is an object of the present invention to provide an evaporating device which can be used.

[0005]

According to a first aspect of the present invention, there is provided an evaporating dish having a drain hole on a bottom surface for allowing received drain water to overflow downward, and a detachable overflow pipe passing through the drain hole. A detachable pipe stopper having an upper end part which presses the overflow pipe in the direction of the opening edge of the drain hole to hold the overflow pipe in the evaporating dish and which is bent outward so as to be in contact with the upper end of the overflow pipe; The present invention provides an evaporator characterized by having the following. According to the evaporating apparatus of the first aspect of the present invention, the detachable overflow pipe is pressed by the pipe stopper in the direction of the opening edge of the drain hole of the evaporating dish, and the evaporating dish and the overflow pipe are fixed in close contact with each other. In addition to being able to prevent drainage along the outer surface to the lower evaporating dish, the upper end of the pipe stopper is bent outward while contacting the upper end of the overflow pipe, so the surface acting on the surface of the overflow pipe The tension can be cut or reduced.

Further, since the overflow pipe and the pipe stopper are detachable, maintenance of the evaporating dish and the like can be easily performed. The invention according to claim 2 is characterized in that an evaporating dish having a drainage hole on the bottom surface for allowing the received drain water to overflow downward, a detachable overflow pipe passing through the drainage hole, and the overflow pipe being connected to the drainage hole. A mounting portion that extends outwardly from the lower end of the overflow pipe to hold the overflow pipe on the evaporating dish by pressing in the direction of the opening edge and to support the lower end of the overflow pipe; and extends above the mounting portion. Further, the present invention provides an evaporator characterized in that a detachable pipe stopper having an abutting portion that abuts on the back surface of the evaporating dish is provided.

According to the second aspect of the present invention, the contact portion of the pipe stopper is brought into contact with the back surface of the evaporating dish while the overflow pipe is placed on the placement portion of the pipe stopper. The height of the overflow pipe relative to the depth of the evaporating dish can always be determined to be the same height.

[0008]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a low-temperature showcase 1 as an embodiment to which the present invention is applied, FIG. 2 is a plan view of a machine room 2 of the low-temperature showcase 1, FIG.
4 is a sectional view taken along line AA of the evaporator 3, FIG. 5 is a plan view of the lowermost evaporating dish 20 of the evaporator 3, FIG. 6 is a vertical sectional front view of a main part of the evaporator 3, and FIG. Each figure is shown. In the low-temperature showcase 1 of the embodiment, side plates 7, 7 are attached to both sides of a heat-insulating wall 6 having a substantially U-shaped cross section, and a storage room 8 having an opening at the front is formed. Are provided on a plurality of shelves 9.

A machine room 2 is formed on a base 11 below the bottom wall 6A of the heat insulating wall 6. In the machine room 2, a condenser 12 of a cooling device, which is located on one side and on the front side, is provided.
1, and a condensing fan 13 as a blower is mounted on the rear side. The evaporator 3 of the present invention is installed on the base 11 behind the condensing fan 13, and a compressor 14 of a cooling device is installed on the base on the other side in the machine room 2.

[0010] The evaporating device 3 includes a column 1 standing at four corners.
, And four evaporating dishes 17, 1 held at predetermined intervals above and below inside the columns 16 ...
8, 19, and 20. Each evaporating dish 1
7, 18, 19, and 20 each have a predetermined depth and have a rectangular shape, and the side surfaces thereof are inclined such that the lower portion is on the inside. In each of the evaporating dishes 17, 18, and 19, a drain hole is provided near both corners on one diagonal line, and in each of the evaporating dishes, near a corner where the drain hole of the immediately above evaporating dish is not provided. At the same time, detachable overflow pipes 21A, 21B, 22A, through which drain holes are inserted,
22B, 23A, and 23B are provided respectively, and overflow pipes 21A, 21B, 22A, 22B,
The overflow pipes 21A, 21B, 22A, 22B, 2 are pressed against the opening edges of the drain holes 23A, 23B.
An elastic and detachable pipe stopper 33 for holding the 3A, 23B on the evaporating dishes 17, 18, 19 is provided via a packing 34, and the lowermost evaporating dish 20 is provided.
Overflow pipes 24A and 24B extend below the machine room 2 through the base 11. A drain tank (not shown) is arranged below the overflow pipes 24A and 24B.

Here, each evaporating dish 17, 18, 19, 20
However, even if the evaporator 3 itself is inclined in the front-rear direction or the left-right direction due to installation conditions or an incorrect installation method, etc., overflow pipes are provided near each corner on one diagonal line in each stage. Therefore, the drain water on each evaporating dish is supplied to either overflow pipe 21A,
21B, 22A, 22B, 23A, 23B, 24A, 2
4B, the water can be drained to a lower evaporating dish or a drainage tank.
7, 18, 19, and 20 can prevent the drainage from overflowing to the outside.

Also, the overflow pipes 21A, 21B, 2
An upper end portion 33A that bends outward while being in contact with the upper ends of 2A, 22B, 23A, and 23B;
A side portion 33B which comes into contact with the inner walls of A, 21B, 22A, 22B, 23A, 23B via packing 34, and overflow pipes 21A, 21B, 22A, 22B, 2
A mounting portion 33C on which the lower ends of the 3A and 23B are mounted, and an overflow pipe 21A extending upward from the mounting portion 33C.
An upright portion 33D located outside of the upright portions 21B, 22A, 22B, 23A, and 23B, and a contact portion 33 bent outward from the upright portion 33D and in contact with the back surfaces of the evaporating dishes 17, 18, and 19.
E is provided.

With the above configuration, the side pipe 33B of the pipe stopper 33 is detachably attached to the overflow pipe 21.
Since the inner walls of A, 21B, 22A, 22B, 23A, and 23B are provided with elasticity toward the opening edge direction of the drain hole, each of the evaporating dishes 17, 18, 19 and the overflow pipes 21A, 21B, 22A, 22B, 23A, 23
B and the overflow pipe 21
A, 21B, 22A, 22B, 23A, 23B can be prevented from being drained to the lower evaporating dishes 18, 19, 20 along the outer surfaces thereof. In addition, the upper end 33A of the pipe stopper 33 is attached to the overflow pipes 21A, 21B. , 2
2A, 22B, 23A, and 23B are bent outward while being in contact with the upper ends of the overflow pipes 21A, 2B.
1B, 22A, 22B, 23A, and 23B serve to cut the surface tension acting on the surface. Temporarily pipe stopper 3
The upper end 33A of each of the 3 is an overflow pipe 21A, 21
B, 22A, 22B, 23A, 23B, even if provided over the entire circumference, the overflow pipe 21A,
21B, 22A, 22B, 23A, and 23B, since the upper surface area is the same as that of the overflow pipes 21A, 21B, 22A, 22B, 23A, and 23.
The surface tension acting on B can be reduced. Also, by removing the pipe stopper 33, the overflow pipes 21A, 21B, 22A, 22B, 23A,
23B can be removed and each evaporating dish 17, 18, 1
Maintenance such as drainage of the drain water remaining in 9 can be easily performed. Further, the mounting portion 33C is provided with the overflow pipes 21A, 21B, 22A, 22B, 2
The lower ends of 3A and 23B are placed, and the contact portion 33E contacts the back surfaces of the evaporating dishes 17, 18, and 19,
The positions of the overflow pipes 21A, 21B, 22A, 22B, 23A, 23B with respect to the evaporating dishes 17, 18, 19 can always be determined at the same height.

A cooler (not shown) of the cooling device is provided inside the heat insulating wall 6, and a bottom wall 6A of the heat insulating wall 6 is provided.
A drain receiving portion 26 for collecting drain water from the cooler is formed on the upper surface, and a bottom wall 6 is formed from the drain receiving portion 26.
A drain pipe 27 penetrates A and faces the inside of the machine room 2. The evaporating dish 17 at the uppermost stage of the evaporating device 3 is detachably held by the columns 16..., Is located below the drain pipe 27, and has overflow pipes 21 A, 2.
1B is a position that does not overlap with the drain pipe 27 in the vertical direction.

The second and third evaporating dishes 18 and 1 from the top
Evaporating pipes 28 and 29 as heating means for flowing the hot gas discharged from the compressor 14 are inserted into the pipe 9, and the overflow pipes 22 A and 22
B, 23A, and 23B are disposed at positions lower than the upper ends. In this case, the evaporation pipe 28 is located upstream of the evaporation pipe 29 on the refrigerant circuit.

On the back surface of the lowermost evaporating dish 20, a heater heater 38 composed of an electric heater is provided by a heater pressing plate 37.
Are heat-exchangeably mounted, and a heat insulating material 39 is interposed between the back surface of the heater pressing plate 37 and the base 11. Also,
A capacitance type water level detector 43 as a water level sensor is attached to the support 16 by an insulating plate 42, and its electrode plate 44 is provided.
Is inserted from above into the lowermost evaporating dish 20. The lower end (tip) of the electrode plate 44 is located at a predetermined height from the bottom surface of the evaporating dish 20.

Next, FIG. 8 shows a low-temperature showcase 1 (ie,
The block diagram of the control device 46 of the evaporator 3) is shown. The control device 46 is constituted by a general-purpose microcomputer 47. The input of the microcomputer 47 is connected to the output of the temperature sensor 51 for detecting the temperature of the storage room 8 or the temperature of the cool air discharged into the storage room 8. The output of the water level detector 43 is also connected. The output of the microcomputer 47 is the motor 14M of the compressor 14 and the condensing fan 13
Motor 13M and the heater 38 are connected.

The operation of the low-temperature showcase 1 with the above configuration will be described with reference to the timing chart of FIG. The microcomputer 47 normally executes a thermo operation. In this thermo-operation, the microcomputer 47 determines the motor 14M of the compressor 14 when the temperature of the storage room 8 reaches a predetermined upper limit temperature based on the output of the temperature sensor 51.
Then, the motor 13M of the condensing fan 13 is started. When the cooler exerts a cooling action by the operation of the compressor 14, the cool air is discharged and circulated into the storage room 8 by a fan (not shown) and the temperature of the storage room 8 reaches a predetermined lower limit temperature.
4 and the motor 13M of the condensing fan 13 are stopped.

Further, the microcomputer 47 forcibly stops the motor 14M of the compressor 14 and the motor 13M of the condensing fan 13 every two hours, for example, and executes defrosting (OFF cycle defrosting) of the cooler. Drain water generated by this defrosting is collected in a drain receiver 26 of the heat insulating wall 6, flows down from a drain pipe 27, and is received by the uppermost evaporating dish 17 of the evaporator 3.

Various foreign matters (dust) are contained in the drain water flowing into the evaporating dish 17, and the ones heavier than water settle on the bottom of the evaporating dish 17. At this time, since the evaporating dish 17 is not provided with a hot pipe or a heater, the evaporating dish 17 can be removed from the columns 16 to clean the precipitate. Then, the level of the drain water in the evaporating dish 17 rises and the overflow pipes 21A, 21B
When the water reaches the upper end of the pipe, the refuse and the wastewater (the supernatant precipitated as described above) float on the overflow pipes 21A and 21A.
It flows in from the upper end of 1B and flows down to the second-stage evaporating dish 18 located below (spillover). Further, when the water level rises to the upper ends of the overflow pipes 22A and 22B of the evaporating dish 18 due to the flow of the drain water, the overflow pipe 22
Drain water flows in from the upper ends of A and 22B and sequentially flows down to the third-stage evaporating dish 19 located below.

The drain water flowing into the evaporating tray 18 and the evaporating tray 19 is sequentially heated and evaporated by the evaporating pipes 28 and 29, so that the amount of evaporation greatly increases. Also in this case, since the hot gas flows into the evaporating pipe 28 of the upper evaporating dish 18 first, the upper evaporating dish 18 is heated by the hotter evaporating pipe 28, and the drain water is evaporated as much as possible there. And the amount of waste water flowing down to the lower evaporating dish 19 can be reduced.

Here, the amount of drainage increases in summer and the like, and
The heating of the evaporating pipes 28 and 29 becomes insufficient and the evaporating dish 1
The level of the drain water in 9 is overflow pipe 23A,
When the drain water rises to the upper end of 23B, the drain water finally flows down to the lowermost evaporating dish 20 therethrough. Then, when the amount of water in the lowermost evaporating dish 20 increases and the water level rises and rises to a predetermined water level and the tip of the electrode plate 44 of the water level detector 43 is immersed in the drain water, the electrode plate 44 and the evaporating dish 20 Since the capacitance between the air level changes from the case of air, the water level detector 43
Produces output.

When the water level detector 43 detects the predetermined water level of the lowermost evaporating dish 20 in this manner, the microcomputer 47 starts energizing the heating heater 38 based on the output of the water level detector 43, and starts condensing. The motor 13M of the fan 13 is forcibly and continuously operated. The drain water in the evaporating dish 20 is heated by the heater 38 and is forcibly evaporated. However, the heat generation of the heater 38 is started when the drain water in the evaporating dish 20 reaches a predetermined water level. This makes it possible to avoid the generation of evaporation noise and steam which may be a problem when the evaporating dish 20 is heated in a small amount.

When the condensing fan 13 is operated, outside air is sucked into the machine room 2 as shown by arrows in FIGS. Then, the sucked outside air reaches the evaporator 3 via the condensing fan 13. The outside air reaching the evaporator 3 is supplied to each evaporating dish 17-1.
9 is directed obliquely downward by the inclination of the side surface, and is sprayed on the drainage surfaces of the evaporation trays 18 to 20 located on the lower side, so that the evaporation of the wastewater in each of the evaporation trays 17 to 20 is further smoothed. The evaporator 3 has four evaporating dishes 17 to 2.
Since 0 is provided, a part of the wind blown to the defroster 3 rebounds and is directed toward the compressor 14 as indicated by an arrow in FIG. 2, so that the air cooling of the compressor 14 is also performed without any trouble. At this stage, the microcomputer 47 ends the defrosting, and the compressor 14 has returned to the normal thermo-operation.

When the drain water in the lowermost evaporating dish 20 evaporates due to the heating of the heater 38, the water level of the evaporating dish 20 drops and falls below a predetermined water level, and when the electrode 44 comes out of the water surface,
The capacitance changes and the output of the water level detector 43 returns to the initial state. However, the microcomputer 47 energizes the motor 13M of the condensing fan 13 and the heater 38 by fixing (forcibly) it for a predetermined period of time, for example, 45 minutes after the output of the water level detector 43 changes, for 45 minutes. , The power supply to the condensing fan 13 and the heater 38 (forced power supply) is terminated.

Here, even if the electrode 44 comes out of the water surface, the drain water remains in the evaporating dish 20 at a lower water level than the electrode 44. However, the microcomputer 47 does not
Since the power supply to the condensing fan 13 and the heater 38 is stopped after a certain period of time after the water 4 comes out of the water surface, the drain water remaining in the evaporating dish 20 can be completely evaporated.

In the embodiment, the upper and lower four-stage evaporating dishes 17 to 2 are used.
Although the evaporator 3 is constituted by 0, the evaporating dish into which the evaporating pipe is inserted may be one stage and a total of three stages may be used.
Further, it may be constituted by a multi-stage evaporating dish. Furthermore,
In the embodiment, the water level sensor is constituted by a capacitance type water level detector, but is not limited thereto, and a water level sensor of a float type or the like may be used. Furthermore, in the embodiment, the present invention is applied to a low-temperature showcase, but the present invention is also effective for a refrigerator or an air conditioner for home use or business use.

[0028]

As described above in detail, according to the first aspect of the present invention, the detachable overflow pipe is pressed by the pipe stopper in the direction of the opening edge of the drain hole of the evaporating dish, and the evaporating dish and the overflow pipe come into close contact with each other. In addition to being able to prevent being drained to the evaporating dish below along the outer surface of the overflow pipe, the upper end of the pipe stopper is bent outward while contacting the upper end of the overflow pipe. The surface tension acting on the surface of the overflow pipe can be cut or reduced. Further, since the overflow pipe and the pipe stopper are detachable, maintenance of the evaporating dish and the like can be easily performed.

According to the evaporating apparatus of the second aspect of the present invention, the abutting portion of the pipe stopper abuts on the back surface of the evaporating dish while the overflow pipe is mounted on the mounting portion of the pipe stopper. The height of the overflow pipe relative to the depth of the evaporating dish can always be determined to be the same height.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a machine room of the low-temperature showcase of FIG. 1;

FIG. 3 is a vertical sectional side view of the machine room in FIG. 2;

FIG. 4 is a sectional view taken along line AA of the drainage device.

FIG. 5 is a plan view of a lowermost evaporating dish of the drainage device.

FIG. 6 is a vertical sectional front view of a main part of the drainage device.

FIG. 7 is a perspective view of a pipe stopper.

FIG. 8 is a block diagram of a control device for a low-temperature showcase.

FIG. 9 is a timing chart showing operations of a compressor, a condensing fan, a heater, and the like.

[Explanation of symbols]

 3 evaporator 17-20 evaporating dish 21A-24B overflow pipe 33 pipe stopper

Claims (2)

[Claims] An evaporating dish having a drain hole at a bottom surface for draining the received drain water downward, a detachable overflow pipe inserted through the drain hole, and an opening edge of the drain hole. A removable pipe stopper having an upper end portion which presses in the direction to hold the overflow pipe in the evaporating dish and which is bent outward to be in contact with the upper end of the overflow pipe. . 2. An evaporating dish having a drain hole on the bottom surface for allowing the received drain water to overflow downward, a detachable overflow pipe passing through the drain hole, and an opening edge of the drain hole. A holding portion extending outwardly from a lower end of the overflow pipe to hold the overflow pipe on the evaporating dish by pressing in a direction and supporting a lower end of the overflow pipe; and An evaporator, comprising: a detachable pipe stopper having an abutting portion that abuts on the back surface of the evaporating dish.