JPS62155485A - Deicing operation controller for ice machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an ice maker, and more particularly to a dehydration operation control device for an inverted cell type ice maker that performs dehydration operation using hot gas.

(b) Conventional technology Conventionally, the dehydration operation of this type of ice maker was carried out, for example, in
As described in Publication No. 15089, when the water tray starts tilting upon completion of ice making, hot gas is circulated through the evaporation pipe to heat the cooler and dehydrate the ice formed in the ice making compartment, for example. As described in Japanese Utility Model Publication No. 58-13249, hot gas is circulated to the evaporator at the same time as the tilting of the water tray ends to remove ice formed in the ice-making chamber.

(c) Problems to be Solved by the Invention In the former dehydration operation, hot gas circulation starts at the same time as the water tray starts tilting, so when the ambient temperature is high,
The condensation temperature becomes high and the temperature of the hot gas also becomes high.
The part of the ice cube that is in contact with the cooler will melt in a short time, but
The part of the ice cube that is in contact with the water tray does not melt easily, and as a result, when the water tray is tilted, the water tray should first move away from the ice cube and then cool, leaving the ice cube in the cooler. In contrast to the normal operation in which ice cubes are removed from the container, the water tray tilts with the ice cubes still attached to the water tray, leading to a problem in which the ice cubes attached to the water tray do not come off from the water tray in the worst case scenario. was.

On the other hand, in the latter dehydration operation, hot gas circulation starts at the same time as the water tray ends, so the drawbacks of the former are avoided, but on the other hand, the dehydration time becomes longer, resulting in a decrease in ice making capacity, and the water tray tilting The cooling operation until the end of the process sometimes resulted in overcooling, causing cracks in the ice cubes and causing problems such as deterioration in quality.

(d) Means for Solving the Problems In order to solve the problems of the above-mentioned prior art, the present invention cools the cooler with a low-temperature refrigerant that is circulated in the evaporator vibrator, and cools the water tank with a circulation pump. This is an ice maker that performs ice making operation by spouting water into the ice maker from a fountain hole formed on the surface of the water tray, and performs dehydration operation by heating the cooler with real gas circulated through the evaporator vibrator. A water tray switch is provided to detect the closed state of the water tray which closes the ice making compartment and the open state of the water tray which starts tilting based on the completion of the ice making operation, and the hot water to the evaporator vibrator is installed based on the detection of the open state of the switch. This is a dehydration operation control device for an ice maker that starts gas circulation.

(E) Effect According to the above-described dehydration operation control device of the present invention, the hot gas circulation to the evaporating vibrator is controlled by the water tray starting tilting based on the completion of the ice making operation, and the water tray switch detecting the open state of the water tray. Start when. As a result, since the cooler is heated with the water tray open, ice cubes are prevented from sticking to the water tray and tilting.

(f) Embodiment FIG. 1 shows a partially cutaway side view of the ice maker of the present invention, which has a large number of ice maker compartments (1A) that open downward.
The cooler (1) with a refrigeration system evaporation vibrator (2) installed on the outer surface of the earthen wall and each ice making room (IA) are closed from below with sufficient margin, and the surface is equipped with a wall corresponding to each ice making room (IA). A water pan (5) having a fountain hole (3) and a return hole (4), and a water tank () fixed to the water pan (5) and communicating with the return hole (4).
6), a circulation pump (9) that circulates the water in the water tank (6) from the water fountain (3) to each ice making compartment (IA) via the water pipe (7) and the distribution pipe 8); A drive device (11) including a speed reduction motor (10) capable of forward and reverse rotation for tilting and reciprocating the dish (5), and a water sprinkler that sprinkles water on the surface of the water dish (5) when the water supply valve (12) is opened. (13) and the water level switch (14C) by the flow 1-(14B> in the float tank (14A>) that communicates with the bottom of the water tank (6).
A so-called inverted cell ice maker is comprised of a water level detection device (14) that operates the water tank (6) and detects a predetermined water level of the water tank (6). Therefore, it was fixed to the support beam (15), and the mounting was done to the plate (1
A drive cam (17) having first and second arms (17A) and (17B) extending in opposite directions is connected to the output shaft of the deceleration motor (10) supported by the cam. The other end of the coil spring (18) attached to the end of the first arm (17A) of (17) is connected to the side of the water tray (5), and the rear part of the water tray (5) is attached to the rotation shaft ( 19〉.

(20) is the second arm (1) of the drive cam (17) that rotates counterclockwise due to the forward rotation of the deceleration motor (10).
7B), the deceleration motor (1o) is de-energized and the water tray (5) is stopped at a predetermined inclined open position, and the drive cam (17) rotates clockwise due to the reverse rotation of the deceleration motor (10). This is a control switch for a seesaw set that is switched by the first arm <17A> and cuts off the power to the deceleration motor (10) to stop the water tray (5) at a predetermined horizontal closed room position. (29) is a water tray switch that detects the open/closed state of the water tray (5), and the contacts of the switch (29) are opened and closed by an operation plate (32) fixed to the side of the water tray (5).

Next, the electric circuit of the present invention will be explained based on FIG. (
21) is an electric compressor for the refrigeration system, and (22) is a timer for controlling the end of the ice-making operation, which has a timer contact (22A) that closes the contact when a predetermined time has elapsed. (23)
is a dehydration detection thermostat that detects the removal of ice by manually raising the temperature of the cooler (1), and when the temperature of the cooler (1) falls to a predetermined temperature, it switches to the L contact (23A) and the temperature rises to the predetermined temperature. (24) is the first relay connected in series with the water storage switch (25) which closes the contact when a predetermined water storage amount is detected.
Relay contact (24A>) and normally open first relay contact (24B)
). (26) is a second relay, which has normally closed second relay contacts (26A), (26B> and (26C>) and normally open second relay contacts <26D) and (26E).
27) is the third relay, the normally open third relay contact <27A
) and (27B>. (28) is the fourth relay,
It has a normally open fourth relay contact (28A) connected in series with the hot gas valve (31). (29) is the water tray switch, and the water tray (5) closes the ice making compartment (IA). It has a closed contact (29A) that is located when the water tray (5) opens the ice making compartment (IA) (when the water tray is separated from the bottom surface of the ice) and an open contact (29B) that is located when the water tray (5) opens the ice making compartment (IA). (12
) is the water supply valve connected in series with the water level switch (14C), (20A1) and (20A2) are the tilting contacts of the control switch (20), (20B1) and (20B)
2) is a double-acting contact of the control switch (20). (
10) is the deceleration motor that rotates forward or reverse depending on the switching of the control switch (20), (9) is the circulation pump, and (30) is the condenser air cooling fan. Note that the water level detection device (14) is mechanically provided with a differential to prevent water from being supplied during ice-making operation.

Next, the present invention will be explained in detail. The water tray (5) is in a horizontal state with the ice making compartment (IA) closed, as shown by the solid line in Figure 1, and when the power is turned on, the normally closed first relay contact (24A)
In addition, the water supply valve (12), which is energized via the water level switch (14C), opens, and water is sprinkled from the sprinkler (13) onto the surface of the water tray (5), and mainly passes through the return hole (4) to the water tank ( 6) Start water supply. In addition, the electric compressor (21) operates to cool the cooler (1), and the normally closed first relay contact (24A), the tilting contact (20A1), and the normally closed second relay contact (25A). The circulation pump (9) and the condenser air-cooling fan (30) operate through the ice-making operation to start ice-making operation.
After that, when the water level in the water tank (6) reaches a predetermined water level, the contact of the water level switch (14C) is opened by the float (14B), and the water supply valve (12) is cut off to stop watering. ) ends the water supply operation.

Therefore, the water in the water tank (6) passes through the water pipe (7) and the distribution pipe (8), flows from each water fountain hole (3) to each ice making compartment (IA), and then enters the ice making compartment (IA). Excess water that does not freeze is returned through the return hole (
After the start of ice making, the water circulation operation from 4) to the water tank (6) is repeated, and when the temperature of the cooler (1) drops to a predetermined temperature, the dehydration detection thermostat (23) switches between the H contact (23B) and the mustard contact. (23A) to start the timer <22), and when the predetermined time indicated by the timer mark 22) has elapsed, the timer contact (22A) is closed, the second relay (26) is energized, and the normally closed The two relay contacts (26A>, (26B>, and (26C)) open, and the normally open second relay contacts (26D) and (26E) close.This causes the circulation pump (9) and fan (28) to Stop and end the ice making operation.The third relay (27) that is energized at this time is the water storage switch (25).
This is to prevent mid-operation stoppage due to closed circuit.

When the ice making operation is completed, the dehydration operation is started. That is, the deceleration motor (1o) is energized through the timer contact (22A) and the tilting contact (20A2) and rotates forward, and the drive cam (17>) rotates counterclockwise. 5) peels off from the bottom surface of the ice cubes frozen in the ice making compartment (IA) and starts tilting.When the water tray <5) slightly opens the ice making compartment (IA), the water tray switch (29) moves from the operation plate ( 32)
is released, and the switch (29) switches from the closed contact (29A> to the open contact (29B). As a result, the fourth relay (29B)
8) is energized, the normally open fourth relay contact (28A) is closed, the hot gas valve (31) is energized, and the valve (31) is energized.
1) opens and starts hot gas circulation to the evaporation pipe (2), heating the cooler (1) and dehydrating the ice cubes frozen in the ice making compartment (IA). Also, when some of the ice-making water left in the water tank (6) is drained while the water tray (5) is tilting, the water level switch (14c) closes, the water supply valve (12) is energized, and the water sprinkler ( 13), water spraying for cleaning is started on the surface of the water tray (5). Therefore, the drive cams (17) (7
) 2nd (7) 7-me (17B) is the control switch '/+(20
) is switched from the tilting contacts (20A1) and (20A2) to the double-acting contacts (20B1 and <2082), the power to the deceleration motor (1o) is cut off, and the water tray (5) moves to the two points shown in Figure 1. The tilting operation ends at the tilted position where the ice making compartment (IA) is opened as shown by the chain line. In this state, water is left in the water tank (6) at a level as shown by the dotted line (X) in Figure 1, preventing dry operation when starting the circulation pump (9) in the next cycle. .

Therefore, each ice making compartment (
The ice detaches from the dehydration detection thermostat) - (2
3) senses a predetermined temperature rise of the cooler (1) and switches from the L contact (23A) to the H contact (23B), the power to the timer (22) is cut off and the timer contact (22A) switches from the L contact (23A) to the H contact (23B).
) returns to normal. Also at this time, the second relay (26
) is de-energized and the second relay contact (26A) is normally closed.
, (26B) and <26C> are closed to normal, and the normally open second relay contacts (26D) and (26E) are opened to normal, so the double acting contact (20) of the control switch (20)
B1), the deceleration motor (10) is energized via the normally closed second relay contact (26B>), and this time it rotates in the opposite direction, causing the drive cam (
17) rotates clockwise and the water tray (5) starts to move backward.

The first arm (17A) of the drive cam (17) then controls the control switch (20) with the double-acting contacts (20B1) and (20B1).
0B2) to the tilting contacts (20A1> and (20A2), the deceleration motor (10) is de-energized and the water tray 5) is switched back to each ice making compartment (I) as shown by the solid line in Figure 1.
The double movement is completed and stopped at the horizontal position where A) is closed, and at this time, the water tray switch 29) is switched from the open contact (29B) to the closed contact (29A) by the operation plate (32),
Furthermore, the power supply to the hot gas valve (31) is cut off and the dehydration operation is ended, and at the same time cooling of the cooler (1) is started, the circulation pump (9) and fan (30) are also operated, and the next cycle of ice making operation is started. do. After that, when the water level of the water tank (6) reaches a predetermined level, the float (14B) is activated as described above.
As a result, the contact of the water level switch (14C) is opened, and the power supply to the water supply valve (12) is cut off, thereby ending the water supply operation.

(g) Effects of the Invention As described above, the present invention provides a water tray switch that detects the state in which the ice making chamber is opened by the water tray that tilts based on the completion of the ice making operation, and the switch detects the open state of the water tray. By starting hot gas circulation to the evaporation vibrator and delaying the hot gas circulation from when the water tray starts to tilt, the water tray will not tilt with the bottom surface of the ice stuck to the water tray. The ice can be removed from the ice-making compartment after the water tray is tilted, which has the advantage of eliminating troubles in dewatering operation.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of an ice maker equipped with the apparatus of the present invention, and FIG. 2 is an electric circuit diagram of the present invention. (1)...Cooler, (IA)...Ice making room, ri2
〉...Evaporation pipe, (5)...Water dish, (average)
...Water dish switch, (29A)...Closing contact, (2
9B)...Open contact, (32)...Operation board.

Claims (1)

[Claims] 1. A cooler equipped with a refrigeration system evaporation pipe and partitioned into many ice-making compartments that open downward, a tiltable water tray that closes each ice-making compartment, and a water tank fixed to the water tray. , a fountain hole comprising a drive device for tilting and moving a water tray, and a circulation pump, the cooler being cooled by a low-temperature refrigerant circulated through the evaporation pipe, and water in the water tank formed on the surface of the water tray by the circulation pump; In an ice-making machine that performs ice-making operation by spraying water into the ice-making compartment and performs ice-making operation by heating a cooler with hot gas circulated through an evaporation pipe, the water tray closes the ice-making compartment. A water tray switch device is provided for detecting a closed state and an open state of the water tray that starts tilting based on the end of the ice making operation, and hot gas circulation to the evaporation pipe is provided based on the detection of the open state of the switch device. A dehydration operation control device for an ice maker, characterized in that the dehydration operation control device starts the dehydration operation of an ice maker.