JPH0711376B2 - Ice bank type water cooler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an ice bank type cold water device in which a part or most of the cold water in a water tank is an ice layer by a cooling coil.

(B) Conventional technology It is known that an ice layer having a predetermined thickness is adhered and formed on a cooling coil arranged in a water tank, and the cooling capacity of the cold water is enhanced by the latent heat of the ice, which is called an ice bank. .

The water level in the water storage tank is higher when a part of the cold water in the water storage tank is an ice layer than when the water in the water storage tank is only cold water. This is a phenomenon that occurs because the volume of cold water containing ice increases, and such a phenomenon is disclosed in Japanese Utility Model Publication No. 61-29009 (F25
D 11/00). In the beverage cooling pouring machine of Japanese Utility Model Publication No. 61-29009, a configuration is adopted in which a liquid level change of a cold water tank is detected by a cylindrical body whose upper part is open to the atmosphere.
The evaporator of the refrigerator unit and the cooling pipe of the beverage are arranged in the cold water tank.

(C) Problem to be Solved by the Invention In the above-described conventional technique, the upper portion of the tubular body is open to the atmosphere, and therefore the ice-making detector that detects the thickness of ice fails and the When the ice layer formed by the adhesion gradually grows, there is a problem that water overflows from the upper part of the cylindrical body and leaks from the beverage cooling pouring machine, and the whole area is polluted.

One of the objects of the present invention is to solve the above problems, and when the water level control device and / or the ice thickness detection device fails, the water in the water storage tank is discharged to the outside from the overflow channel. Is to prevent the overflow of cold water even when a certain amount of ice layer is formed and the water level in the water tank rises.

(D) Means for Solving the Problem In order to achieve the above object, in the chilled water device of the present invention, a predetermined amount of ice is stored in the water tank by the first water surface whose inlet is determined by the water level control device and the cooling coil. An overflow channel that is higher than the second water level when formed inside is provided, and when the water level control device and the ice thickness detection device operate normally, that is, the water level is the second level.
It is a structure that avoids the overflow of cold water even when the water surface is.

(E) Action According to the above configuration, since the inlet of the overflow pipe, which is the overflow channel, is located higher than the first water surface and the second water surface, the cold water cooled by the cooling pipe is cooled and iced. There will be no overflow in and there will be no waste of cold water.

When the water level control device and / or the ice thickness detection device has an abnormality, that is, a malfunction, and water continues to be supplied, or when the ice layer is formed to have a predetermined thickness or more, drainage from the overflow pipe to the outside through the drain pipe. it can.

(F) Embodiments Embodiments of the present invention will be described below with reference to the drawings.

(1) shown in Fig. 1 and Fig. 2 is a chilled water supply device which is one kind of ice bank type chilled water device used in kitchens such as fresh fish counters in restaurants and restaurants. The purpose of using this chilled water supply device is When cooking and processing fresh fish that has been stored in a cold state, it is necessary to wash away the blood and residue of the fresh fish with cold water so that the quality of the fresh fish does not change due to washing, that is, the temperature of the fresh fish does not rise.

The cold water supply device (1) is filled between an inner box (3) defining the water tank (2), an outer box (4) accommodating the inner box, and both the inner and outer boxes (3) and (4). It is composed of a foam insulation material (5), an insulation box (7) having an upper insulation lid (6), and a machine room (8) formed below the insulation box.

The cold water supplier (1) includes a cooling coil (9) bent in a meandering shape and arranged in a water tank (2), and a pair of upper and lower plate-shaped support members (10) (10) for supporting the cooling coil. 11) and
A water level control device (S) including a water supply valve (14) with a float (13) for supplying a predetermined amount of, for example, 200 l of tap water from a water supply pipe (12) to the water storage tank (2), and the float movable vertically. An overflow channel or overflow pipe (15) whose upper end inlet (15B) is located slightly above, for example, 3.5 cm above the first water surface (L) determined by (13), and the water tank (2).
The upper end entrance faces the lower part of the base and the lower end outlet is equipped with a calan (16), and two circulation pumps (17) (18) are provided between the inlet and the outlet.
And a flow switch (1 that drives this pump (18)
9), a cold water extraction pipe (20) and an upper end outlet thereof are located above the inlet of the cold water extraction pipe (20) in the water storage tank (2), and a lower end inlet thereof is the cold water extraction pipe (20). ), A cold water return pipe (22) equipped with a flow rate control valve (21) consisting of an orifice or an elliptic valve, connected between the circulation pump (18) and the flow switch (19), and an overflow pipe (22) at one end. 15), the other end is connected to the cold water extraction pipe (20), and a communication pipe (24) provided with a drain valve (23) is provided midway.

Further, in the machine room (8), a refrigerant compressor (25) and a condenser (2) which constitute a refrigeration system together with the cooling coil (9).
6), liquid receiver (27), gas-liquid separator (28), drainage port (29) which is the outlet of both pumps (17) (18) and overflow pipe (15), and cold water extraction pipe (20) ) Is provided with a cold water port (30). The drain port (29) and the cold water port (30) are used for pumping (17) (1) when draining water from the water tank (2).
It is installed in the base (31) of the machine room (8) lower than both pumps so that the water in 8) will also drain. The drain port (29) is connected to a drain pipe (15A) which is a part of the overflow pipe (15), and the cold water port (30) is a part of the cold water take-out pipe (20). A hose (20A) equipped with a callan (16) is connected.

The refrigeration system includes a compressor (25), a condenser (26), a liquid receiver (27), an expansion valve (32), a cooling coil (9), a gas-liquid separator (28), a high pressure gas pipe (33), A high-pressure liquid pipe (34), a low-pressure liquid pipe (35), and a low-pressure gas pipe (36) are annularly connected to form a closed circuit, which compresses, liquefies, and decompresses the refrigerant circulated during the cooling operation. The water is made into cold water by evaporating and vaporizing, and an ice layer (H) having a predetermined thickness is formed around the cooling coil (9). With the formation of this ice layer (H), the water level rises to the second water surface (M) shown by the dashed line in FIG.
Becomes Reference numeral (37) is a heat exchange portion formed by a part of the high pressure liquid pipe (34) and a part of the low pressure gas pipe (36), and is a high temperature high pressure liquid refrigerant and a low temperature low pressure gas-liquid mixed refrigerant. By mutually exchanging heat with each other, the liquid refrigerant becomes a supercooled liquid while the gas-liquid mixed refrigerant becomes a gas refrigerant. (38) is an ice thickness detecting device having two sensors (39) (40) provided at positions slightly apart from the surface of the cooling coil (9),
The electromagnetic valve (41) provided in the middle of the high pressure liquid pipe (34) is opened and closed by detecting the presence or absence of electric conductivity between the both sensors (39, 40). That is, when both the sensors (39) (40) are covered with ice, the electric conductivity between the both falls below the set value, the solenoid valve (41) is closed, and the both sensors (39) (40) are closed. When both are exposed to water, the electric conductivity between the two is increased above the set value and the solenoid valve (41) is opened. The electromagnetic valve (41) is for pump down (refrigerant recovery), and when the electromagnetic valve (41) is closed, the refrigeration system switches from cooling operation to pump down operation. This pump-down operation is stopped when the low-pressure force of the refrigerating apparatus falls below the set value of the low-pressure switch (42) provided in the low-pressure gas pipe (36). or,
On the contrary, in the cooling operation, cold water is supplied to the outside through the extraction pipe (20), and tap water is supplied from the water supply pipe (12) into the water storage tank (2) to raise the water temperature, and the sensor (39) (40). ) When the surface is exposed to cold water, the solenoid valve (41) is opened, and the low-pressure force becomes equal to or higher than the set value of the low-pressure switch (42). The low pressure switch (42) starts and stops the compressor (25). The expansion valve (32) is of the external uniform temperature type,
The temperature sensing part (43) is provided in the low-pressure gas pipe (36) between the heat exchange part (37) and the gas-liquid separator (28), and the low-pressure gas heated in the heat exchange part (37). The temperature of the refrigerant is detected.

The cooling coil (9) is composed of a plurality of copper pipe groups (9A) (9B) bent in a meandering shape as shown in FIGS. 3 and 4.
It is constructed by welding (9C) one after another. Each of the pipe groups (9A), (9B), and (9C) is formed by cutting a pipe wound on a roll into a predetermined length and bending it with an NC bender. Each pipe group is formed in a U shape. The upper and lower curved portions (44), the straight line portions (45) formed between the respective curved portions, and the upper end connecting portion (46) of the straight line portions is the longest extending above the curved portion. Straight portions (45A) are formed respectively. (47) is each pipe group (9A)
(9B) A welded portion formed by continuously connecting the connection portion (46) of (9C) with a brazing material such as silver braze or copper braze.
When the cooling coil (9) is arranged in the water storage tank (2) as shown in FIG. 4 and FIG. 4, the welded portion (47) has the first water level (L) determined by the water level control device (S). , Ice layer (H)
Second water surface (M) and overflow pipe (15) during formation
It is located above the entrance (15B).

Here, the horizontal dimension of the opening of the water tank (2) is 60 cm, and the vertical dimension is
The water level rise in the case of 50 cm, 200 liters of water and cooling, and 100 kg to 115 kg of ice layer (H) attached to the cooling coil (9) is calculated as follows. In the formula below, 0.
917 has an ice density of kg / l.

(1) When 100 kg of ice layer (H) is adhered and formed, it becomes 100 kg / 0.917 = 109.05 l, and 100 l of water is solidified into 109.05 l of ice.

109.05l-100l = 9.05l, which means that the ice layer (H) increased the volume by 9.05l.

Dividing this volume increase by the opening area gives 9050 ÷ (60 × 50) ＝ 3.05cm, and the 3.05cm water level rises.

(2) When 115 kg of ice layer (H) is adhered and formed, 115 kg / 0.917 = 125.40l 125.40l−115l = 10.40l 10400 / (60 × 50) = 3.40 cm, and the water level rises by 3.40 cm.

Therefore, the height of the inlet (15B) of the overflow pipe (15) is determined by the water level control device (S) when the first water surface (L) and the ice layer (H) having a predetermined thickness are formed. Due to the fact that it is higher than the second water surface (M), cold water does not overflow even during or after the completion of ice making. The height of the inlet (15B) of the overflow pipe (15) may be set appropriately according to the amount of ice making.

According to such a configuration, the inlet (15B) of the overflow pipe (15) is located higher than the first water surface (L) and the second water surface (M), and therefore is cooled by the cooling coil (9). The cold water thus produced does not overflow during the cooling and ice making process, the waste of cold water is eliminated, and the refrigeration system saves electricity.

Further, when the water level control device (S) and / or the ice thickness detection device (38) has an abnormality, that is, a malfunction, and water supply is continued, or when the ice layer (H) is formed to have a predetermined thickness or more, Water can be discharged from the overflow pipe (15) through the drain pipe (15A) to the outside, and water treatment that corresponds to the failure of each attached device can be performed.

(G) Effect of the Invention According to the present invention described above, the following effects occur.

Since the inlet of the overflow channel is located at a position higher than the first water surface and the second water surface, the cold water cooled by the cooling coil does not overflow in the cooling and ice making process,
The waste of cold water is eliminated and the refrigeration system saves electricity.

When the water level control device and / or the ice thickness detection device has an abnormality, that is, a malfunction, and water supply is continued, or when the ice layer is formed to have a predetermined thickness or more, it can be drained to the outside from the overflow channel through the drain pipe, Water treatment that corresponds to the failure of each attached device can be performed.

[Brief description of drawings]

Each of the drawings shows an embodiment of the chilled water device of the present invention, FIG. 1 is an overall longitudinal sectional view, FIG. 2 is a schematic sectional view with chilled water and a refrigerant circuit attached, FIG. 3 is a side view of a cooling pipe, and FIG. The figure is a plan view of the cooling coil. (2) …… Water tank, (9) …… Cooling coil, (15) ……
Overflow pipe (overflow channel), (15B) …… Inlet,
(L) ... first water surface, (M) ... second water surface, (H)
...... Ice layer, (S) ...... Water level control device.

Claims (1)

[Claims] 1. A water supply pipe, a water level control device for supplying a predetermined amount of water from the water supply pipe into a water storage tank and determining the water level in the water storage tank, and cooling the water, and at least this water. A cooling coil having a part of ice and a second inlet when the inlet is higher than the first water surface determined by the water level control device and a predetermined amount of ice is formed in the water tank by the cooling coil. An ice bank type cold water device comprising an overflow channel arranged at a position higher than the water surface and a water pipe connected to the overflow channel and discharging water from the overflow channel to the outside.