JPH0586546B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an ice bank type cold water supply machine that forms an ice layer around a cooling coil.

(b) Prior art The water-cooled thermal storage beverage supply device disclosed in Japanese Patent Publication No. 62-11275 (F25D 11/00) has a cooling coil for a refrigeration device disposed within a water storage tank, and a predetermined thickness is provided around the coil. An ice layer, that is, an ice bank, is constantly formed and the latent heat of this ice layer is used to enhance the cooling effect of the cold water, and an agitator placed in the water storage tank circulates and sends the cold water, thereby controlling the upper and lower temperatures of the cold water. On the other hand, a configuration is adopted in which an agitator is placed inside a spirally wound cooling coil, and a spirally wound cold water outlet pipe is placed outside.

(c) Problems to be Solved by the Invention According to the above-mentioned conventional technology, since the ice layer formed on the cooling coil indirectly cools the water in the cold water outlet pipe, the cold water in the water storage tank The amount should not be large, but since the water storage tank houses the agitator and cold water outlet pipe in addition to the cooling coil, the storage tank itself becomes large, and a refrigerator with a large refrigerating capacity is required. In addition to the problem of high equipment and operating costs, if the ice layer grows beyond the specified thickness due to failure of the ice thickness detection device, the agitator may hit the ice layer and cause damage. The problem arises that, furthermore,
When taking out cold water from the cold water intake pipe, the temperature of the uncooled part of the cold water intake pipe that is exposed above the water surface and the water in this uncooled part is high, so immediately after opening the water intake valve, it is initially uncooled. water is taken out, and cold water at a predetermined temperature is taken out after a while, resulting in a problem that the quick response of cold water removal is poor.

In view of the above problems, it is an object of the present invention to arrange means for circulating cold water outside the water storage tank and to improve the quick response of taking out cold water.

(d) Means for Solving the Problems In order to achieve the above object, the cold water supply machine of the present invention includes a water storage tank, a water supply pipe whose one end faces the water storage tank, and a predetermined amount of water in the water storage tank. A water level control device that supplies water from a water supply pipe and determines the water level, a cooling coil that cools the water and forms a part of this water as an ice layer, and a circulation pump and water intake valve that are constantly operated. a cold water take-out pipe having an inlet facing into the water storage tank, an inlet connected between a circulation pump and a water intake valve of the cold water take-out pipe, and an outlet located above the lower end of the cooling water coil in the water storage tank; a cold water return pipe that is located and faces upward, and at least one portion of which is narrower than the inner diameter of the cold water outlet pipe;
A cold water circulation path was constructed with a water storage tank, cold water take-out pipe, circulation pump, and cold water return pipe.

(E) Effect According to the above configuration, since the circulation pump serving as the cold water circulation means is arranged in the cold water outlet pipe outside the water storage tank, compared to a structure in which the cold water circulation means is arranged inside the water storage tank, The volume can be reduced, and the cooling effect of the cold water by the ice layer is improved.

In addition, since a circulation pump is used to form a cold water circulation path from the water tank to the cold water take-out pipe to the cold water return pipe to the water tank, the temperature difference between the top and bottom of the cold water in the water tank is eliminated, and furthermore, the lower end of the cooling coil The cold water that flows out from the outlet of the cold water return pipe located above and facing upward flows almost uniformly between the cooling coils, and is sucked in from the inlet of the cold water take-out pipe, making the temperature of the cold water around the cooling coil almost uniform. Therefore, the growth of the ice layer H adhering to the cooling coil and the melting of the ice layer after the ice making is completed can be made almost uniform. Since the water is cooled, cold water can be taken out immediately when the water intake valve is opened.

Furthermore, by making a portion of the cold water return pipe constituting the cold water circulation path narrower than the inner diameter of the cold water take-out pipe, the speed of cold water flowing back into the water tank from the cold water return pipe can be slowed down, and the water intake valve 16 can be A predetermined water pressure can be applied to the cold water taken out when the door is opened.

(f) Examples Examples of the present invention will be described below based on the drawings.

1 shown in Figures 1 and 2 is a cold water supply machine used in fresh fish sections of stores and kitchens of restaurants, etc.
The purpose of using this cold water supply machine is to use a large amount of cold water to wash away blood and residue from the fresh fish when cooking and processing fresh fish that has been kept in a cool state. The purpose is to prevent the temperature from rising.

The cold water supply device 1 consists of an inner box 3 defining a water storage tank 2, an outer box 4 housing the inner box, and a foam insulation material 5 filled between the inner and outer boxes 3 and 4, and a heat insulating lid on the top surface. 6 and a machine room 8 formed below the heat insulating box.

The cold water supply device 1 includes a cooling coil 9 curved in a meandering shape and arranged in the water storage tank 2, and a pair of upper and lower plates that support the cooling coil and are formed with a large number of through holes 9A and 10A, respectively. shaped supports 10, 11
The upper end inlet 15B is slightly above the water level L determined by the water supply valve 14 with a float 13 that supplies a predetermined amount of tap water from the water supply pipe 12 to the water storage tank 2, and the float 13 that is movable in the vertical direction. The overflow pipe 15 is located, the upper end inlet 20A faces the lower part of the water storage tank 2, and the water intake valve 16 is located at the lower end outlet.
and two circulation pumps 1 between the inlet and outlet.
7, 18 and a flow switch 19, and an upper end outlet 22A are located above the inlet of the cold water outlet pipe 20 and the lower end of the cooling coil 9 in the water storage tank 2 and face upward, In addition, the lower end inlet 22B is connected between the circulation pump 18 and the flow switch 19 of the cold water outlet pipe 20, and a flow rate control valve 21 consisting of an orifice or a globe valve.
A communication pipe 24 is provided, which has one end connected to the overflow pipe 15, the other end connected to the cold water take-out pipe 20, and has a drain valve 23 in the middle.

The machine room 8 also includes a refrigerant compressor 25 and a condenser 2, which together with the cooling coil 9 constitute a refrigeration system.
6. In addition to the liquid receiver 27 and the gas-liquid separator 28, a drain port 29 which is the outlet of the pumps 17 and 18 and the overflow pipe 15, and a cold water port 30 which is the outlet of the cold water take-out pipe 20 are provided. The drain port 29 and the cold water port 30 are connected to the pump 1 when draining water from the water tank 2.
It is provided at the base 31 of the machine room 8 at a lower position than both pumps so that water from pumps 7 and 18 can also drain out. Incidentally, a drain pipe 15A, which is a part of the overflow pipe 15, is connected to the drain port 29, and
A hose 20A including the water intake valve 16, which is a part of the cold water outlet pipe 20, is connected to the cold water port 30.

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. The cooling coil 9 is configured as a closed circuit by connecting the coils in a ring, and compresses, condenses, liquefies, depressurizes, and evaporates the refrigerant that is circulated during the cooling operation, thereby turning the water into cold water.
An ice layer H of a predetermined thickness is formed around the . This ice layer H
With the formation of , the water level L rises by the volumetric expansion. 37 is a heat exchange section formed by one part of the high pressure liquid pipe 34 and one part of the low pressure gas pipe 36, which mutually exchanges heat between the high pressure liquid refrigerant having a high temperature and the low pressure gas-liquid mixed refrigerant having a low temperature. By doing so, the liquid refrigerant is made into a supercooled liquid, while the gas-liquid mixed refrigerant is made into a gas refrigerant. Reference numeral 38 indicates two sensors 39, each provided at a position slightly apart from the surface of the cooling coil 9.
40, wherein both the sensors 3
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 electrical conductivity between the high pressure liquid pipe 34. That is, when both sensors 39 and 40 are covered with ice, the electrical conductivity between them drops below the set value, so the solenoid valve 41 closes, and both sensors 39 and 40 are exposed to water. sometimes,
Control is performed such that the electrical conductivity between the two increases above the set value and the solenoid valve 41 is opened. Said solenoid valve 4
1 is for pump down (refrigerant recovery), and when this solenoid 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 of the refrigeration system drops below the set value of the low pressure switch 42 provided in the low pressure gas pipe 36. Conversely, in the cooling operation, cold water is taken out from the take-out pipe 20 and tap water is supplied into the water storage tank 2 from the water supply pipe 12 to raise the water temperature, causing the sensors 39, 40
The electromagnetic valve 41 is opened when the surface is exposed to cold water, and restarted when the low pressure exceeds the set value of the low pressure switch 42. Note that this low pressure switch 42 starts and stops the compressor 25. The expansion valve 32 is of an external temperature type, and a temperature sensing section 43 connected to a capillary reach tube 44 is provided in a low pressure gas pipe 36 between the heat exchange section 37 and the gas-liquid separator 28. , the temperature of the low pressure gas refrigerant heated in the heat exchanger 37 is detected.

Pump 17 of both circulation pumps 17 and 18
is operated at all times, and the pump 18 is operated by a flow switch 19 which detects the flow of cold water when the water intake valve 16 is opened. The circulation of cold water by the pump 17 is always carried out from the water tank 2 to the cold water outlet pipe 20 to the cold water return pipe 22 to the water tank 2 as shown by the solid line arrow in FIG. Because it is constricted and smaller than the diameter of the pipe, the water pressure at the outlet 22A of the cold water return pipe 22 is low, and the water circulation is carried out slowly at a speed of, for example, 0.2 m/sec or less, as shown by the chain line in Figure 1. This continues even when cold water is taken out from the cold water take-out pipe 20 as shown by the arrow. Since the cold water outlet pipe 20 and the cold water return pipe 22 constitute a cold water circulation path, the flow switch 1 is connected to the flow switch 1 from the inlet 20A by the circulating cold water and the heat conduction of this cold water.
The temperature is maintained at a low temperature until 9.

FIG. 3 shows another embodiment of the present invention, in which a circulation pump 17 controlled by an inverter 45 is installed in the cold water circulation path.
When the intake valve 16 is closed, that is, when the flow switch 19 does not detect the flow of cold water, the inverter 45 controls the output of the circulation pump 17 to, for example, 50% to reduce the water pressure. When the intake valve 16 is opened, that is, when the flow switch 19 detects the flow of cold water, the output of the circulation pump 17 is reduced by the inverter 45.
It is configured to maintain high water pressure by controlling it to 100%. The water pressure in the cold water circulation path is controlled by controlling the number of two circulation pumps 17 and 18 in Fig. 1, and by controlling the capacity of one circulation pump 17 in Fig. 3. May be used.

According to such a configuration, the circulation pumps 17 and 18 serving as cold water circulation means are connected to the cold water outlet pipe 20 outside the water storage tank 2.
Because of the arrangement, the volume of the water storage tank 2 can be reduced compared to a configuration in which the cold water circulation means is arranged inside the water storage tank 2, and the cooling effect of the cold water by the ice layer H is improved.

Also, the water storage tank 2 is pumped using the circulation pumps 17 and 18.
In order to form a cold water circulation path between - cold water outlet pipe 20 - cold water return pipe 22 - water storage tank 2, the temperature difference between the upper and lower sides of the cold water in the water tank 2 is eliminated, and the cold water flowing out from the outlet 22A of the cold water return pipe is cooled. It flows almost uniformly between the coils 9 and is sucked in from the inlet 20A of the cold water take-out pipe 20, and the temperature of the cold water around the cooling coil 9 is kept almost uniform, which prevents the growth of the ice layer H that adheres to the cooling coil 9. It is also possible to make the melting of the ice layer H substantially uniform after the completion of ice making, and it is possible to avoid the occurrence of localized ice blocks in the water storage tank 2 and the unnecessary suspension of operation of the refrigeration equipment to remove these ice blocks. On the other hand, since the cold water that is circulated through the cold water outlet pipe 20 is cooled directly and indirectly, the cold water can be taken out directly when the water intake valve 16 is opened.

Furthermore, by making a portion of the cold water return pipe 22 constituting the cold water circulation path narrower than the inner diameter of the cold water outlet pipe 20, the speed of the cold water flowing back into the water storage tank 2 from the cold water return pipe 22 is slowed down. While avoiding turbulence due to excessive circulation of water, a predetermined water pressure can be applied to the cold water taken out when the water intake valve 16 is opened.

(g) Effects of the invention According to the present invention described above, the following effects occur.

Since the circulation pump that serves as the cold water circulation means is placed in the cold water outlet pipe outside the water storage tank, compared to a configuration in which the cold water circulation means is placed inside the water storage tank, the volume of the water storage tank can be made smaller and equipment and operating costs can be reduced. It can be done inexpensively and the cooling effect of cold water due to the latent heat of the ice layer is improved.

Water storage tank - cold water extraction pipe - using a circulation pump
Chilled water return pipe - The cold water that flows out from the outlet of the cold water return pipe, which forms the cold water circulation path of the water storage tank and is located above the lower end of the cooling coil and faces upward, flows almost uniformly between the cooling coils, and the cold water is taken out. Since the cold water is sucked in from the inlet of the pipe, the temperature difference between the top and bottom of the water storage tank is eliminated, and the temperature of the cold water around the cooling coil is maintained almost uniformly, allowing the growth of the ice layer adhering to the cooling coil and the completion of ice making. The subsequent melting of the ice layer can also be made almost uniform, and the ice thickness can always be kept almost uniform.In addition, since the cold water that is circulated through the cold water outlet pipe is cooled directly and indirectly, it becomes colder. Chilled water can be taken out immediately when the water intake valve is opened, improving responsiveness when taking out cold water.

By making one part of the cold water return pipe that makes up the cold water circulation path narrower than the inner diameter of the cold water outlet pipe, the speed of cold water flowing back into the water tank from the cold water return pipe is slowed down, thereby preventing excessive circulation of cold water. While avoiding turbulence, a predetermined water pressure can be applied to the cold water taken out when the water intake valve is opened.

[Brief explanation of the drawing]

The drawings all show an embodiment of the cold water supply device of the present invention, and FIG. 1 is an overall configuration diagram including both refrigerant and chilled water circuits, FIG. FIG. 1 is an overall configuration diagram showing an example. 2...Water tank, 9...Cooling coil, 12...Water supply pipe, 16...Water intake valve, 17, 18...Circulation pump, 20...Cold water take-off pipe, 22...Cold water return pipe,
H...Ice layer, S...Water level control device.

Claims (1)

[Claims] 1. A water tank, a water supply pipe with one end facing the water tank, a water level control device that supplies a predetermined amount of water into the water tank from the water supply pipe and determines the water level, and a water level control device that cools the water and controls the water level. a cooling coil that deposits a portion of the water as an ice layer; a cold water take-out pipe that includes a circulation pump and a water intake valve that are operated at all times, and whose inlet faces into the water storage tank; and a circulation pump whose inlet is the cold water take-out pipe. and a water intake valve, the outlet of which is located above the lower end of the cooling water coil in the water storage tank and faces upward, and at least one portion of which is narrower than the inner diameter of the cold water outlet pipe; Equipped with a cold water supply machine.