JPH0894238A - Vaporization apparatus - Google Patents

Abstract

PURPOSE: To provide a vaporization apparatus capable of securing predetermined vaporization capability and contributing energy saving. CONSTITUTION: A plurality of evaporating dishes 17 to 20 are vertically disposed, and drain is vaporized in multiple stages by overflowing drain received on an upper side evaporating dish to a lower evaporating dish in succession. There are provided a heater 38 for heating a lowest stage evaporating dish 20, a water level detector 43 for detecting a water level in the lowest evaporating dish 20, and a controller for controlling power supply to the heater 38 based upon an output from the water level detector 43.

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 waste water from a low-temperature showcase, a refrigerator or the like and subjecting it to an evaporation treatment.

[0002]

2. Description of the Related Art Conventionally, in this type of low temperature showcase or refrigerator, as shown in, for example, Japanese Patent Publication No. 52-22711 (F25D21 / 14), defrosting water (drainage) for a cooler is received in a machine room. An evaporating dish is installed, and the evaporating dish is configured to evaporate the defrost water by heating it with a pipe through which a high-temperature refrigerant (hereinafter referred to as hot gas) discharged from an electric heater or a compressor flows. It was

[0003]

However, in the case of heating with hot gas, the operating rate of the compressor is lowered,
When the amount of defrost water increases in the summer, etc. (about 27 liters of defrost water is generated per day in a normal low temperature showcase)
Has a problem that the evaporation capacity cannot be met in time. Also,
In the case of an electric heater, although a required heating amount can be secured, there is a problem that power consumption increases and it goes against energy saving.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and an object thereof is to provide an evaporator capable of ensuring required evaporation ability and contributing to energy saving.

[0005]

According to a first aspect of the present invention, there is provided an evaporation apparatus, in which a plurality of evaporation trays are installed one above the other, and the drainage received by the upper evaporation tray is successively overflowed to the lower evaporation tray. Is an electric heater that heats the bottom evaporating dish, a water level sensor that detects the water level of this bottom evaporating dish, and the electric heater is energized based on the output of this water level sensor. And a control device for controlling.

According to the second aspect of the present invention, a plurality of evaporating dishes are installed vertically, and the drainage received by the upper evaporating dish is made to overflow to the lower evaporating dish one by one so that the drainage is carried out in multiple stages. An air blower that blows air to each evaporation tray, an electric heater that heats the bottom evaporation tray, a water level sensor that detects the water level of this bottom evaporation tray, and the output of this water level sensor. The blower and a control device for controlling the electric heater are provided, and this control device operates the blower and energizes the electric heater when the water level in the bottommost evaporating dish rises to a predetermined water level. .

Further, in the above-mentioned evaporator of the invention of claim 3, the controller stops the blower with a delay for a predetermined period after the water level of the bottommost evaporation tray is lower than the predetermined water level,
The power supply to the electric heater is stopped.

[0008]

According to the evaporator of the first aspect of the present invention, a plurality of evaporating dishes are installed vertically, and the drainage received by the upper evaporating dish is made to sequentially overflow into the lower evaporating dish to evaporate in multiple stages. At the same time, the bottom evaporating dish is heated by an electric heater, so that the drainage is sequentially received by a plurality of evaporating dishes and evaporated in each evaporating dish, and the amount of drainage increases and the bottom evaporating When it reaches the plate, it is possible to forcibly evaporate it by the electric heater, and it is possible to avoid a water leakage accident when a large amount of drainage occurs.

In particular, a water level sensor for detecting the water level of the bottommost evaporation tray is provided, and the controller controls the energization of the electric heater based on the output of this water level sensor. Only when the above condition is reached, it is possible to energize the electric heater, and it is possible to reduce power consumption and contribute to energy saving.

According to the evaporator of the second aspect of the present invention, in addition to this, when the water level of the bottommost evaporation dish rises to a predetermined water level, the blower that blows air to each evaporation dish is operated and the electric heater is energized. As a result, the electric capacity of the electric heater is increased by the air blown by the blower, and the electric heater heats up after the drainage is stored to some extent in the lowermost evaporation tray.
It is possible to avoid the generation of evaporation noise or steam, which is a problem when the evaporation dish is heated with a small amount of drainage.

Further, according to the evaporation apparatus of the third aspect of the invention, in addition to this, after the water level of the evaporating dish at the lowermost stage becomes lower than the predetermined water level, the blower is stopped for a predetermined period of time and the electric heater is turned off. Since the energization is stopped, the drainage of the bottommost evaporation tray can be completely evaporated.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. 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. 3 is a vertical side view of the machine room 2, and FIG. FIG. 5 shows a vertical front view of the drainage device 3 of the invention, and FIG. 5 shows a plan view of the bottommost evaporation tray 20 of the drainage device 3, respectively. In the low temperature showcase 1 of the embodiment, side plates 7 and 7 are attached to both sides of a heat insulating wall 6 having a substantially U-shaped cross section, and a storage chamber 8 having an opening on the front side is configured. A plurality of shelves 9 ... Is erected.

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

The evaporating device 3 is a column 1 that stands upright at the four corners.
6 and four evaporating dishes 17, 1 vertically held at predetermined intervals inside these columns 16 ...
8, 19, and 20 are provided. Each evaporation dish 1
7, 18, 19, and 20 have a predetermined depth and are in the shape of a rectangle, and the side surfaces thereof are inclined so that the lower portions are inside. Further, overflow pipes 21, 22, 23, 24 are attached to the respective evaporation trays 17, 18, 19, 20 at positions that do not overlap each other in the vertical direction, and the overflow pipes 24 of the evaporation tray 20 at the bottom stage are respectively attached. Extends through the base 11 and extends below the machine room 2.
A drain tank (not shown) is arranged below the overflow pipe 24.

Inside the heat insulating wall 6, a cooler (not shown) of the cooling device is provided, and the bottom wall 6A of the heat insulating wall 6 is provided.
A drain receiving portion 26 for collecting defrost water from the cooler is formed on the upper surface, and the drain receiving portion 26 provides a bottom wall 6A.
A drainage pipe 27 faces the inside of the machine room 2 through the.
The uppermost evaporation tray 17 of the drainage device 3 is detachably attached to the support column 16
, And is located below the drain pipe 27, and the overflow pipe 21 does not overlap the drain pipe 27 in the vertical direction.

Evaporation pipes 28 and 29, through which the hot gas discharged from the compressor 14 flows, are inserted into the evaporation trays 18 and 19 at the second and third stages from the top, respectively, and the overflow pipes 22 and 23 respectively. It is located lower than the top edge. In this case, the evaporation pipe 28 is located upstream of the evaporation pipe 29 on the refrigerant circuit. The evaporation pipes 28, 29 are held in the evaporation dishes 18, 19 by the pressing members 33, 34 with the rubbers 31, 32 interposed therebetween.

The pressing members 33 and 34 are respectively attached to the evaporation trays 18,
The evaporating dish 18, 1 has a height dimension from the upper edge of 19 to a position lower than the upper ends of the overflow pipes 22, 23.
9, the pressing member 33 is located between the overflow pipe 21 and the overflow pipe 22, and the pressing member 34 is the overflow pipe 2.
2 and the overflow pipe 23. As a result, the pressing member 33 partitions the upper part of the evaporation tray 18 into an area below the overflow pipe 21 and an area where the overflow pipe 22 exists, and the pressing member 34 separates the upper part of the evaporation tray 19 from the overflow pipe 2.
2 is divided into a region located below and a region where the overflow pipe 23 exists.

On the back surface of the bottommost evaporation tray 20, a heater holding plate 37 is provided with a heater 38 composed of an electric heater.
Are mounted so as to exchange heat with each other, and a heat insulating material 39 is interposed between the back surface of the heater pressing plate 37 and the base 11. Also,
An overheat protector 41 composed of a temperature fuse and a bimetal is attached to the lower surface of the evaporation tray 20. Furthermore,
An electrostatic capacity type water level detector 43 as a water level sensor is attached to the column 16 by an insulating plate 42, and its electrode plate 44
Is inserted from above into the evaporation tray 20 at the bottom. The lower end (tip) of the electrode plate 44 is arranged at a predetermined height above the bottom surface of the evaporation dish 20.

Next, FIG. 6 shows a low temperature showcase 1 (that is,
3 shows a block diagram of a controller 46 of the evaporator 3). The control device 46 is composed of a general-purpose microcomputer 47, and the input of this microcomputer 47 is connected to the output of a temperature sensor 51 that detects the temperature of the storage chamber 8 or the temperature of the cool air discharged into the storage chamber 8. Further, 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
The motor 13M and the heater 38 are connected.

The operation of the low temperature showcase 1 having the above configuration will be described with reference to the timing chart of FIG. The microcomputer 47 normally executes the thermo operation. In this thermo-operation, the microcomputer 47 is based on the output of the temperature sensor 51, and when the temperature of the storage chamber 8 reaches a predetermined upper limit temperature, the motor 14M of the compressor 14
Also, the motor 13M of the condensing fan 13 is started. When the cooler exerts a cooling action by the operation of the compressor 14 and cool air is discharged and circulated to the storage chamber 8 by a fan (not shown) and the temperature of the storage chamber 8 reaches a predetermined lower limit temperature, the microcomputer 47 causes the compressor 1 to operate.
The motor 14M of No. 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, to execute defrosting of the cooler (OFF cycle defrosting). The drainage (defrost water) generated by this defrosting is the heat insulation wall 6
Are collected in the drain receiver 26, flowed down from the drain pipe 27, and received in the uppermost evaporation tray 17 of the evaporator 3.

The drainage flowing into the evaporation tray 17 contains various foreign matters (dust), and of which, heavier than water, is deposited on the bottom of the evaporation tray 17. At this time, the evaporation dish 1
Since 7 is not provided with a hot pipe or heater, it can be removed from the columns 16 ...

When the water level of the waste water in the evaporating dish 17 rises to reach the upper end of the overflow pipe 21, the dust and the waste water floating there (supernatant sedimented as described above) flow in from the upper end of the overflow pipe 21. It flows down to the second-stage evaporation tray 18 located below (overflow). Furthermore, the overflow pipe 2 of the evaporation tray 18 is caused by the inflow of waste water.
When the water level rises to the upper end of 2, the drainage flows in from the upper end of the overflow pipe 22 and sequentially flows down to the third evaporation tray 19 located below.

The drainage flowing into the evaporation tray 18 and the evaporation tray 19 is sequentially heated by the evaporation pipes 28 and 29 to be evaporated. Also in this case, since the hot gas is introduced into the evaporation pipe 28 of the upper evaporation dish 18 first,
The hotter evaporation pipe 28 heats the upper evaporating dish 18 to evaporate the waste water as much as possible, thereby reducing the amount of waste water flowing down to the lower evaporating tray 19.

Here, the wastewater that has flowed into the evaporating dish 18 contains floating dust, and this dust floats on the drainage surface in the evaporating dish 18, but this floating dust is overflowed by the pressing member 33 into the overflow pipe 21. It is stopped by the side. Since the overflow pipe 22 is located on the opposite side of the overflow pipe 21 with the pressing member 33 interposed therebetween, it is difficult for the floating dust to flow into the overflow pipe 22.

Similarly, floating dust remaining in the drainage flowing into the evaporating dish 19 is also stopped by the pressing member 34 toward the overflow pipe 22, so that even when the drainage rises above the upper end of the overflow pipe 23,
The dust floating on the evaporation tray 19 is overflow pipe 23
It becomes difficult to flow into.

As described above, the evaporator 3 separates and removes the sediment in the waste water by the uppermost evaporation tray 17, and separates and removes the suspended dust by the second and third evaporation trays 18 and 19. Since the structure is adopted and the foreign matter is prevented from flowing down from the upper evaporation dish to the lower evaporation dish, diffusion of the foreign matter can be minimized. Further, since the uppermost evaporation tray 17 can be removed and cleaned, maintenance workability is significantly improved, and a sanitary drainage device can be provided. Further, since the floating dusts in the evaporation trays 18 and 19 are also divided by using the pressing members 33 and 34 of the evaporation pipes 28 and 29, no special partition is required, and the number of parts and the cost can be reduced. become able to.

Here, the amount of drainage increases in summer, etc.
Heating of the evaporation pipes 28, 29 becomes insufficient and the evaporation dish 1
When the water level of the wastewater in 9 rises to the upper end of the overflow pipe 23, the wastewater passes through it and finally flows down to the evaporation tray 20 in the lowermost stage. Then, when the amount of water in the bottommost 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 submerged in the drainage,
Since the capacitance between the electrode plate 44 and the evaporation dish 20 changes from the case of air, the water level detector 43 produces an output.

When the water level detector 43 detects the predetermined water level of the lowermost evaporation tray 20 in this way, the microcomputer 47 starts energizing the heater 38 based on the output of the water level detector 43, and the condensing The motor 13M of the fan 13 is forcibly operated continuously. The drainage in the evaporation tray 20 is heated by the heating heater 38 and forcedly evaporated, but the heat generation of the heating heater 38 is started when the drainage in the evaporation tray 20 reaches a predetermined water level, so that the drainage is small. It is possible to avoid the generation of evaporation noise and steam, which are problems when the evaporation dish 20 is heated.

When the condensing fan 13 is operated, outside air is sucked into the machine room 2 as indicated by arrows in FIGS. 2 and 3, and is ventilated by the condenser 12. Then, the sucked outside air reaches the drainage device 3 through the condensing fan 13. The outside air that reaches the drainage device 3 is used for each evaporation tray 17-1.
9 is directed obliquely downward due to the inclination of the side surface of 9 and is sprayed to the drainage surfaces of the evaporation trays 18 to 20 located on the lower side, so that the evaporation of the drainage water in each evaporation tray 17 to 20 becomes smoother. In addition, the drainage device 3 has four evaporating dishes 17-2.
Since 0 is provided, a part of the wind blown to the drainage device 3 bounces on it and is directed in the direction of the compressor 14 as shown by the arrow in FIG. 2, so that the air cooling of the compressor 14 can be performed without any trouble. At this stage, the microcomputer 47 has finished defrosting and the compressor 14 has returned to the normal thermo-operation.

By the heating of the heater 38, the drainage in the lowermost evaporating dish 20 evaporates, the water level lowers and falls below a predetermined water level, and when the electrode 44 appears above the water surface, the capacitance changes. The output of the water level detector 43 returns to the initial state. However, the microcomputer 47 operates the motor 13M of the condensing fan 13 for a predetermined period, for example 45 minutes, from the time when the output of the water level detector 43 changes.
Then, the heater 38 is fixed (forced) and energized, and after 45 minutes have passed, that is, after a delay of 45 minutes, the condensing fan 13 and the heater 38 are energized (forced energization).
To finish.

Here, even if the electrode 44 appears above the water surface, the drainage remains in the evaporation tray 20 at a lower water level than the electrode 44.
However, since the microcomputer 47 stops the energization of the condensing fan 13 and the heater 38 after a predetermined period of delay after the electrode 44 is exposed on the surface of the water, the waste water remaining in the evaporation tray 20 is completely evaporated. be able to.

In the embodiment, the upper and lower four evaporating dishes 17-2 are used.
Although the evaporation device 3 is composed of 0, the evaporation tray having the evaporation pipe inserted therein may be one and the total number of evaporation trays may be three.
Further, it may be composed of multiple evaporating dishes. Furthermore,
In the embodiment, the water level sensor is composed of the capacitance type water level detector, but the present invention is not limited to this, and a float type water level sensor or the like may be used. Furthermore, although the present invention is applied to the low temperature showcase in the embodiment, the present invention is also effective for a refrigerator for home or business use, an air conditioner and the like.

[0034]

As described in detail above, according to the invention of claim 1, a plurality of evaporating dishes are installed vertically, and the drainage received by the upper evaporating dish is successively overflowed to the lower evaporating dish. In addition to evaporating in multiple stages, the bottom evaporating dish was heated by an electric heater, so that the drainage was sequentially received by a plurality of evaporating dishes and was evaporated in each evaporating dish, and the amount of drainage increased. When the bottom evaporating dish is reached, it is possible to forcibly evaporate it by the electric heater, and it is possible to prevent a water leakage accident when a large amount of drainage occurs.

In particular, a water level sensor for detecting the water level of the bottommost evaporation tray is provided, and the controller controls the energization of the electric heater based on the output of this water level sensor. Only when the above condition is reached, it is possible to energize the electric heater, and it is possible to reduce power consumption and contribute to energy saving.

According to the second aspect of the invention, in addition to this, when the water level of the lowermost evaporation dish rises to a predetermined level, the blower for blowing air to each evaporation dish is operated to energize the electric heater. As a result, the electric heater heats up after the drainage is stored in the bottommost evaporation tray to some extent, as well as the evaporation capacity is further increased by the air blown by the blower, so there is a problem when the evaporation tray is heated with a small amount of drainage. It becomes possible to avoid the generation of vaporization noise and steam.

Further, according to the third aspect of the invention, in addition to this, after the water level of the bottommost evaporating dish becomes lower than the predetermined water level, the blower is stopped for a predetermined period of time, and the electric heater is stopped from being energized. By doing so, it becomes possible to completely evaporate the drainage water of the evaporating dish at the lowermost stage.

[Brief description of drawings]

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

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

3 is a vertical side view of the machine room of FIG.

FIG. 4 is a vertical sectional front view of the drainage device of the present invention.

FIG. 5 is a plan view of the bottommost evaporation dish of the drainage device of the present invention.

FIG. 6 is a block diagram of a control device for a low temperature showcase.

FIG. 7 is a timing chart showing operations of a compressor, a condensing fan, a heater, and the like.

[Explanation of symbols]

 3 Evaporating Device 13 Condensing Fan (Blower) 17-20 Evaporating Dish 38 Heating Heater (Electric Heater) 43 Water Level Detector (Water Level Sensor) 44 Electrode Plate 47 Microcomputer

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Harunobu Iguchi 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Toshiaki Kubota 2-chome, Keihanhondori, Moriguchi City, Osaka Prefecture 5-5 Sanyo Electric Co., Ltd. (72) Inventor Hiroshi Taniguchi 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. An evaporation apparatus in which a plurality of evaporation trays are installed vertically, and the wastewater received by the upper evaporation tray is sequentially overflowed to the lower evaporation tray to evaporate the wastewater in multiple stages. An electric heater that heats the plate, a water level sensor that detects the water level of the bottommost evaporation plate, and a control device that controls energization of the electric heater based on the output of the water level sensor are provided. Evaporator. 2. An evaporation apparatus in which a plurality of evaporation trays are installed one above the other, and the wastewater received by the upper evaporation tray is sequentially overflowed to the lower evaporation tray to evaporate the wastewater in multiple stages. A blower that blows air to the bottom, an electric heater that heats the bottom evaporation tray, a water level sensor that detects the water level of the bottom evaporation tray, and a control that controls the blower and the electric heater based on the output of this water level sensor And a controller for operating the blower and energizing the electric heater when the water level of the lowermost evaporation dish rises to a predetermined water level. 3. The controller controls the blower to be stopped for a predetermined period of time after the water level of the bottommost evaporating dish has dropped below a predetermined level, and the electric heater is stopped from being energized. Evaporator.