JPH0638016B2 - Ice storage type cold water supply device - Google Patents

Description

TECHNICAL FIELD The present invention relates to cold water for supplying cold water required for various treatments such as cold salt water treatment of fresh food and dressing treatment of fish in a backyard of a supermarket. The present invention relates to a supply device, and more particularly, to an ice storage type cold water supply device suitable for supplying cold water by utilizing heat storage of ice.

(Prior Art) Conventionally, in this type of ice storage type cold water supply device, an evaporator which is a cooling element of a refrigeration cycle is arranged in a water tank supplied from an external water supply source, and the water tank is surrounded by ice formed on the outer periphery of the evaporator. The water inside is cooled and stored as cold water in the same water tank, and this cold water is made to flow out from the external water faucet through an external piping system, if necessary, and used for the above-mentioned various treatments.

(Problems to be Solved by the Invention) By the way, in such a configuration, the temperature of the cold water flowing out from the external faucet is 0 (° C.). However, the lower the cold water temperature is, the better for various kinds of treatments as described above, but when the worker treats with cold water, it is 5 (° C).
Below, it was too cold to hurt my hands and I couldn't work.
(° C) to 12 (° C) is a temperature suitable for work. Also,
The temperature of cold water is 2 (℃) to 6 when processing vegetables and making bread.
(° C) is required. In such a case, when adjusting the temperature of the cold water flowing out from the external faucet to an appropriate temperature range, it is conceivable to use a mixed faucet instead of the external faucet and mix tap water with the cold water to obtain an appropriate temperature. However, the cost of arranging the cold water supply device increases due to the fact that the mixed faucet is expensive and the pipe for guiding the tap water to the mixed faucet is required. Such a thing becomes remarkable as the number of mixed faucets increases. In addition, the water temperature adjustment by the mixed tap is manual, so it is a complicated task.

Therefore, in order to deal with the above, the present invention attempts to appropriately and automatically control the temperature of the cold water to be used in the ice storage type cold water supply device without adopting an extra component member. It is a thing.

(Means for Solving the Problems) In order to solve the above problems, the configuration of the invention according to claim 1 has an outer tub (20a) erected on an installation surface and an erected inside the outer tub. A plurality of communication holes (22a, 22) that are made up of the inner tank (20b) and lead the water in the outer tank into the inner tank on the upper peripheral wall of the inner tank.
b) forming a water tank (20), and a water supply means (31, Wv) which is in an operating state and causes water from a water supply source (32) to flow into the outer tank, An external reflux system (P ₇ , P ₀ , M ₀ , P ₈ ) that draws the water in the inner tank outward from the bottom and recirculates the water into the inner tank, and surrounds the inner tank in the outer tank. A refrigeration cycle (40, Un) having an evaporator (40) fitted so as to cool the water in the outer tank by the evaporator, and water in the external reflux system interposed in the external reflux system. An external water faucet means (Fc) for causing the water to flow outward, and a replenishing means (P ₅ , Pib, Mib, P ₆ ) that is placed in an operating state to replenish the water in the outer tub to the inner tub, Water level detection means (80) for detecting whether the water level in the outer tank is higher or lower than the lower limit level and the upper limit level at least at a position higher than the communication hole, and A temperature detecting means (Th) for detecting the temperature of water in the inner tank, and the water supply means in an operating state when the water level detecting means detects that the water level in the outer tank is lower than the lower limit level. First control means (Va, Wa, Vb, Rv, for controlling to release the operating state of the water supply means when the same water level detection means detects that the water level in the outer tank is higher than the upper limit level Wb, Vc, Rw)
And a second control means (110) for controlling the replenishing means to be in an operating state when the temperature detected by the temperature detecting means is higher than a predetermined temperature range.

Further, the structural feature of the invention described in claim 2 is that the inner tank (20b) of the invention according to claim 1 is formed of a heat insulating material.

Further, the structural feature of the invention described in claim 3 is that, in the invention according to claim 1, the water level in the inner tank (20b) is detected to be lower than a predetermined low level. When the second water level detecting means (90a) and the second water level detecting means detect that the water level in the inner tank is lower than a predetermined low level, the replenishing means (P ₅ , Pi
The third control means (Rx, X, Rz, Zb, 80a, Rv, Vd, Za) is provided for keeping b, Mib, P ₆ ) in an operating state until the same water level reaches a predetermined level.

Further, the structural feature of the invention described in claim 4 is
In the invention according to claim 1, in the inner tank (20
Second water level detecting means (90b) for detecting that the water level in b) has become lower than a predetermined low level, and that the water level in the inner tank has become lower than a predetermined low level by the second water level detecting means. When the external reflux system (P ₇ , P ₀ ,
The prohibition means (Ry, Y) for prohibiting the operation of M ₀ , P ₈ ) is provided.

(Operation effect) In the invention according to claim 1 configured as described above,
Water is stored in the outer tank to a level between the lower limit level and the upper limit level, the water in the outer tank is cooled by the evaporator under the operation of the refrigeration cycle, and the cold water in the inner tank is within the predetermined temperature range. It is assumed that In this state,
If the cold water in the inner tank is allowed to flow out from the external faucet means under the operation of the external reflux system, the worker can perform various cold water treatment work with the outflowing cold water. In this case, if the predetermined temperature is set within a temperature range suitable for human manual work, various cold water treatment works will be facilitated.

Further, when the water level in the inner tank lowers due to the outflow of cold water from the external faucet means as described above, the water in the outer tank is replenished in the inner tank through the communication hole. As a result, when the water level in the outer tub becomes lower than the lower limit level, the water level detection means detects this and the first control means puts the water supply means into the operating state, so that water is replenished in the outer tub by the water supply means. . Then, when the water level in the outer tub becomes higher than the upper limit level, the water level detection means detects this and the first control means releases the operating state of the water supply means, so that the water supply means supplies water into the outer tub. Be stopped. As a result, the water in the outer tank is always kept between the lower limit level and the upper limit level, and an appropriate amount of water is also kept in the inner tank. In this way, when the water is supplied from the outside by the water supply means, the water supplied from the outside is not directly supplied to the inner tank but is once mixed with the water in the outer tank and then is supplied to the inner tank. As it is supplied, the temperature of the cold water in the inner tank is kept almost constant.

Further, when the temperature of the cold water in the inner tank becomes higher than the predetermined temperature range, the second control means puts the replenishment means into the operating state based on the temperature detected by the temperature detection means, so that the replenishment means is replenished. The cold water in the outer tank is mixed with the cold water in the inner tank, the temperature of the cold water in the inner tank is lowered, and the temperature of the cold water in the inner tank is automatically maintained at an appropriate temperature.

Further, in addition to the above-described effects, the evaporator is provided so as to surround the inner tank in the outer tank, so that the water tank of this type of cold water supply device can be made compact despite the existence of the evaporator. In addition, with the automatic temperature control of the cold water in the inner tank as described above, it is possible to always ensure the outflow of cold water at an appropriate temperature without attaching a mixed water system to the external faucet means. The device can be provided at low cost.

Further, in the invention according to claim 2 configured as described above, since the inner tank is formed of a heat insulating material, it is possible to more appropriately prevent the temperature of the cold water in the inner tank from decreasing.

Further, in the invention according to claim 3 configured as described above, the outflow of water in the inner tank through the outer faucet is controlled by the water supply means to the outer tank through the communication hole and the water supply rate from the outer tank to the outer tank. When the water level in the inner tank reaches a predetermined low level, which is faster than the water supply speed into the inner tank, the second water level detecting means detects this.
The third control means activates the replenishing means until the water level reaches a predetermined level. Therefore, even in this case,
The lack of cold water in the inner tank is replenished.

Further, in the invention according to claim 4 configured as described above, when the cold water level in the inner tank reaches a predetermined low level due to the outflow of water in the inner tank through the external faucet, the second water level is set. The detecting means detects this, and the prohibiting means prohibits the operation of the external return system. As a result, even if there is no cold water, the external recirculation system does not operate unnecessarily, and the system can be operated efficiently.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
Drawing and Drawing 2 show the whole device of the ice storage type cold water supply device concerning the present invention. This device body includes a box-shaped base 10,
It is equipped with a water tank 20 that is vertically fixed on this base 10.
The water tank 20 is composed of a cylindrical outer tank 20a and a cylindrical inner tank 20b standing upright in the center of the bottom wall of the outer tank 20a. In this case, the peripheral wall and the bottom wall of the outer tank 20a are covered with the heat insulating layer 21, while the peripheral wall 22 of the inner tank 20b is formed of a heat insulating material having a good heat insulating property. The height of the upper opening of the outer tank 20a is
It is higher than that at the upper end opening of the inner tank 20b (see FIG. 1).

A pair of upper and lower communicating holes 22a, 22b are formed in the peripheral wall 22 of the inner tank 20b along the entire circumference thereof in the vicinity of the upper end opening of the inner tank 20b as shown in FIG. The communication holes 22a and 22b of the outer tank 2 are located inside the inner tank 20b.
It communicates with the inside of 0a. In the upper opening of the outer tub 20a, an automatic water supply device 30 has its water supply pipe 31 extended in an L shape through a lid 20c.
The water from the water source 32 (at a temperature of about 20 ° C.)
The water is supplied through the water supply pipe 31 through the water supply pipe 31 through the water supply pipe 31 while selectively opening the water supply valve Wv interposed in the water supply pipe 31.

In the outer tank 20a, a hollow columnar evaporator 40 is arranged so as to concentrically surround the inner tank 20b from the outside, and the evaporator 40 is a three-layer cooling pipe concentrically arranged in a spiral shape. It is composed of tubes 41, 42 and 43. The outlet upper end portions of the cooling pipes 41, 42 and 43 of the evaporator 40 are provided with lids 20c upward from the respective outlet upper end portions.
Pipes 41a, 42a, 43 respectively extending through
It is connected to a compressor 50 built in the refrigeration cycle unit Un in the base 10 through a, the connector 44, and the pipe P ₁ .

The compressor 50 is driven by its built-in motor CM (see FIG. 3) to suck and compress the refrigerant in the pipe P ₁ and apply it to the condenser in the refrigeration cycle unit Un as a compressed refrigerant of high temperature and high pressure. This condenser operates under the air-cooling action of the fan motor FM (see FIG. 3) and the compressor 5
The compressed refrigerant from 0 is condensed and applied to the expansion valve 60 through a receiver (not shown) and the pipe P ₂ . The expansion valve 60 expands the inflowing refrigerant and supplies the same expansion refrigerant to the pipes 61,
Cooling pipes 41, 4 of the evaporator 40 through 62, 63
It is made to flow into 2, 43 from each inflow end. This means that the evaporator 40 depends on the inflowing refrigerant of the outer tank 20a.
This means that the water inside is cooled and the outer periphery of each cooling pipe 41, 42, 43 is frozen 41b, 42b, 43b. In addition,
Each of the pipes 61, 62, 63 extends through the lid 20c into the outer tank 20a.

The internal circulation pump P _ia is arranged on the base 10, and the internal circulation pump P _ia includes a motor M _ia (third part) incorporated therein.
Driven by FIG see), the cold water in the inner tank 20b, and pumped through a pipe P ₃ extending through the top wall into the base 10 from the bottom wall of the inner tank 20b is pumped into the pipe P ₄ . In such a case, the pipe P ₄ is connected to the outer tank 20 via the upper wall of the base 10.
The pipe P extends upward along the outer periphery of a.
The tip of the nozzle ₄ extends in a U shape into the outer tub 20a via the lid 20c and is connected to the upper end of the injection pipe 70. The injection pipe 70 has an inner peripheral surface and an evaporator 40 inside the outer tank 20a.
It is installed upright between the outer peripheral surface of the
The peripheral wall of 0 has a plurality of injection holes 71,
... 71 are provided at intervals. In this case, the injection holes 71, ...
2 is opposed to the outer peripheral surface at an acute angle (the angle between the arrow A shown in FIG. 2 and the outer peripheral surface of the evaporator 40). Then, the injection pipe 70 injects the pressure-fed cold water from the pipe P ₄ toward the outer peripheral surface of the evaporator 40 through each injection hole 71.

The internal circulation pump Pib is arranged in the base 10, and the internal circulation pump Pib has a motor M built therein.
Driven by ib (see FIG. 3), the cold water in the outer tub 20a spreads from the bottom wall of the outer tub 20a (corresponding to the outside of the bottom wall of the inner tub 20b) into the base 10 via the upper wall thereof. Outgoing pipe P
_{It is} pumped through ₅ into pumping pipe P ₆ . In such cases,
The pipe P ₆ extends upward along the outer periphery of the outer tank 20a via the upper wall of the base 10, and the tip of the pipe P ₆ has a lid 20c immediately above the upper end opening of the inner tank 20b. The cold water from the internal circulation pump Pib is flowed out into the inner tank 20b through the U-shape.

The external circulation pump Po is arranged in the base 10,
This external circulation pump Po is driven by its built-in motor Mo (see FIG. 3) to cool the cold water in the built-in 20b,
The water is pumped into the pumping pipe P ₈ through the pipe P ₇ extending from the bottom wall of the inner tank 20b into the base 10 via the upper wall thereof.
In such a case, the pipe P ₈ extends outward through the side wall of the base 10 and is disposed at an appropriate place (for example, a backyard of a supermarket), and the tip of the pipe P ₈ has a lid 20c. The cold water from the external circulation pump Po is circulated into the inner tank 20b through the upper end opening portion thereof in a U shape to flow back into the inner tank 20b. Further, a plurality of external faucets Fc, ..., Fc are connected to an intermediate portion of the pipe P ₈ , and each of these external faucets Fc ,. Chill out the cold water in P ₈ . Piping P
The total length of ₈ is, for example, about 50 (m).

Next, the electric circuit configuration of the cold water supply device will be described with reference to FIG. The autotransformer T receives a single-phase 200V from between two lines of a three-phase 200V commercial power source, generates a transformation voltage, and applies it to both common conductors Ta and Tb via a circuit breaker CB. In such a case, the circuit breaker CB also serves as a power switch. The relay coil Ru is connected to the common wire T only when the normally closed type ice detection switch S is closed.
It is excited by receiving a transformation voltage from a and Tb. The relay coil Ru constitutes a relay together with the normally open relay switch U, and the relay coil Ru closes the relay switch U by its selective excitation. The gas valve GV is provided in the outlet side pipe of the compressor 50.
This gas valve GV is opened by receiving the transforming voltage from both common conductors Ta and Tb only when the relay switch U is closed, and allows the refrigerant supply from the compressor 50 to the condenser. The freezing detection switch S is used for the evaporator 4
When freezing of 0 is completed, this is detected and opened. Also, the symbol L
Indicates a pilot lamp.

The relay coil Rv is a normally closed type relay switch Va, Vc.
And both normally open type relay switches Vb and Vd form a relay. This relay coil Rv is a water level sensor 8
Only when the normally open reed switch 80a of 0 is selectively closed, a transformer voltage is applied from both common conductors Ta and Tb to be excited. The relay switch Va is closed when the relay coil Rv is demagnetized, and the transformer voltage from both common conductors Ta and Tb is applied to the water supply valve Wv to open it. The relay switch Va is opened by exciting the relay coil Rv to close the water supply valve Wv. The relay switch Vb is closed by the excitation of the relay coil Rv, and while the relay switch Wa is closed, it applies the transformed voltage from the both common conductors Ta and Tb to the relay coil Rv and holds it by itself. Relay switch V
c is opened only under the selective excitation of the relay coil Rv, and the relay switch Vd is closed only under the selective excitation of the relay coil Rv.

The water level sensor 80 is arranged in a cylindrical auxiliary tank 20d attached to the upper end of the outer peripheral wall of the outer tank 20a as shown in FIGS. The auxiliary tank 20d has its peripheral wall bottom portion
The outer tub 20a is fitted to the outer end of the connection support pipe 23 extending outward from the upper end of the outer peripheral wall of the outer tub 20a and vertically supported. The auxiliary tub 20d contains the cold water in the outer tub 20a. It flows in through the connecting pipe 23. The water level sensor 80 is
The auxiliary tank 20d has a rod 82 (see FIGS. 4 and 5) vertically supported on the inner peripheral surface via upper and lower stays 81a and 81b. The rod 82 has a pair of upper and lower annular rings. The stopper pieces 82a, 82b and 82c, 82d are coaxially fitted.

A reed switch 80a is built in a portion of the rod 82 corresponding to the hollow portion of the stopper piece 82a, while a normally closed reed switch 80b (third portion) is provided in a portion of the rod 82 corresponding to the hollow portion of the stopper piece 82c. (See the figure) is built in. Further, both stopper pieces 82a, 8a of the rod 82 are
An annular float 83 is loosely fitted in the portion between 2b so as to be vertically movable according to the surface level of the cold water in the auxiliary tank 20d, and a permanent magnet is built in the float 83. Then, as shown in FIGS. 4 and 5, the reed switch 80a maintains the open state when the float 83 is locked on the stopper piece 82b. Further, when the float 83 moves upward and is locked to the stopper piece 82a, the reed switch 80a is closed by the permanent magnet in the float 83.

On the other hand, an annular float 84 is loosely fitted between the stoppers 82c and 82d of the rod 82 so as to be vertically movable according to the surface level of the cold water in the auxiliary tank 20d. Is built in. Thus, when the float 84 is locked on the stopper piece 82d as shown in FIGS. 4 and 5, the reed switch 80 is
b remains closed. When the float 84 moves upward and is locked to the stopper piece 82c, the reed switch 80b
Opens. However, the surface level of the cold water in the water tank 20, that is, the surface level of the cold water in the auxiliary tank 20d, and FIGS.
As shown in the figure, the float 83 is locked on the stopper 82b when it coincides with the two-dot chain line La. In addition, the surface level of the cold water in the auxiliary tank 20d is
As shown in FIGS. 5 and 5, the position between the communication holes 22a and 22b of the peripheral wall 22 of the inner tank 20b (indicated by a chain double-dashed line Lb).
The float 84 is adapted to be locked on the stopper 82d. In FIG. 4, reference numeral 2
Reference numeral 4 indicates a heat insulating layer.

The relay coil Rw is a normally closed type relay switch Wa, W.
c, Wd and the normally open relay switch Wb constitute a relay, and the relay coil Rw is excited by receiving a transformation voltage from between the common conductors Ta and Tb only when the relay switch 80b is closed. The relay switch Wa is opened only when the relay coil Rw is excited. The relay switch Wb applies a transformation voltage from between the common conductors Ta and Tb to the relay coil Rw while the relay coil Vc is closed, and causes the relay coil Rw to hold it. Both relay switches Wc, Wd
Opens only when the relay coil Rw is excited. The relay coil Rx constitutes a relay together with the normally open type relay switch X, and the relay coil Rx is a water level sensor 90.
Only when the normally open reed switch 90a is closed, the transformer is excited by receiving the transformer voltage from between the common conductors Ta and Tb. The relay switch X is closed by selectively exciting the relay coil Rx. As shown in FIG. 1, the water level sensor 90 is provided below the inner peripheral surface of the peripheral wall 22 of the inner tank 20 b, and this water level sensor 90 has the same configuration as the water level sensor 80. In such a case, each stay 9 of the water level sensor 90
1a, 91b, rod 92, stopper pieces 92a, 92
b, 92c, 92d, each float 93, 94 is each stay 81a, 81b of the water level sensor 80, rod 82, each stopper piece 82a, 82b, 82c, 82d, each float 8.
3 and 84 respectively. However, when the surface level of the cold water in the inner tank 20b coincides with the chain double-dashed line Lc as shown in FIG. 1 and FIG. 6, the float 93 locks on the stopper 92b, and the surface level is the double-dashed chain line Ld. The float 94 is adapted to be locked on the stopper 92d. A reed switch 90a is built in a portion of the rod 92 corresponding to the hollow portion of the stopper 92a.
Further, a normally closed reed switch 90b (see FIG. 3) is built in a portion of the rod 92 corresponding to the hollow portion of the stopper 92c.

The relay coil Ry constitutes a relay together with the normally-closed relay switch Y, and the relay coil Ry is excited by receiving a transformation voltage from between the common conductors Ta and Tb only when the reed switch 90b is closed. The relay switch Y is opened only when the relay coil Ry is excited. The relay coil Rz constitutes a relay together with the normally open type relay switch Za and the normally closed type relay switch Zb, and this relay coil Rz produces a transformation voltage from between the two common conductors Ta and Tb when the relay switch Vd is closed. Received and excited. The relay switch Za is closed by exciting the relay coil Rz, and when the relay switch X is closed, both common conductors Ta, T are closed.
A transformer voltage from between b is applied to the relay coil Rz, and the relay coil Rz is self-held. Relay switch Zb is relay coil R
Opened by exciting z.

The normally closed type thermoswitch Th is attached to the pipe P ₇ (see FIG. 1), and this thermoswitch Th is connected to the pipe P ₇
It opens when the temperature of the cold water therein becomes lower than a predetermined set temperature (for example, 10 (° C.)). However, the thermoswitch Th is connected to the relay switch Zb. Electromagnetic contactor 100
Is a coil 100a and a normally open magnet switch 10
0b to 100b, and the coil 100a has the common wire T only when the normally closed pressure switch PS is closed.
It is excited by receiving the transformer voltage between a and Tb. Each of the magnet switches 100b to 100b is closed by exciting the coil 100a and applies a three-phase commercial voltage of 200V from a commercial power source to both motors CM and FM to drive them. The pressure switch PS opens when the discharge pressure of the compressor 50 rises abnormally.

The electromagnetic contactor 110 has a coil 110a and normally-open type magnet switches 110b to 110b. The coil 110a is closed by both relay switches Y and Zb and the thermoswitch Th. It is excited by receiving the transformer voltage between Tb. Each magnet switch 110
b to 110b are closed only under the excitation of the coil 110a, apply a three-phase commercial voltage from a commercial power source to the motor Mib to drive the motor Mib, and apply the three-phase commercial voltage to both relay switches Wc and Wd. When the motor is closed, it is applied to the motor Mib to drive it.

The electromagnetic contactor 120 has a coil 120a and normally open type magnet switches 120b to 120b, and the coil 120a receives a transformation voltage between both common conductors Ta and Tb only when the relay switch Y is closed. Be excited. Each of the magnet switches 120b to 120b includes a coil 120a.
Is closed only under the excitation of, and the three-phase commercial voltage from the commercial power source is applied to the motor Mo to drive it.

In the present embodiment configured as described above, the transformer voltage is generated between the autotransformer T and both common conductors Ta and Tb and the circuit breaker CB is closed in a state where there is no water in the water tank 20. Then, the pilot lamp L is turned on, the gas valve GV is opened by closing the relay switch U by exciting the relay coil Ru while the freeze detection switch S is closed, and the electromagnetic contactor 100 closes the pressure switch PS. Under each magnet switch 100
b to 100b are closed, a three-phase commercial voltage from a commercial power source is applied to both motors CM and FM to drive them, and water supply valve W
v is opened when the relay switch Va is closed, and the relay coil Rw is excited when the reed switch 80b of the water level sensor 80 is closed to close the relay switch Wb and the relay switches Wa, Wc, Wd. open. At this time, the relay coil Rw exerts a self-holding action by closing the relay switch Wb, and the motor Mia is prohibited from starting by opening both relay switches Wc and Wd. Further, the relay coil Rx is in the demagnetized state when the relay switch 90a is opened, and the relay coil Ry is excited when the relay switch 90b is closed and the relay switch Y is turned on.
Open the coil 120a of the electromagnetic contactor 120 to the demagnetized state, and the relay coil Rz is set to the relay switch Vd,
It is in a demagnetized state under the opening of Za and X. Both water level sensors 80 and 90 are in the state shown in FIG. 7 (A).

As described above, when the gas valve GV is opened, both motors C
When M and FM are driven, the compressor 50 sucks the refrigerant from the evaporator 40 through the pipes 41a, 42a, 43a, the connector 44 and the pipe P ₁ and compresses the same, and the condenser blows the compressed refrigerant from the compressor 50 into a fan. It is condensed under the action of air cooling by the motor FM and is given to the expansion valve 60 as the condensed refrigerant through the receiver and the pipe P ₂ . Then, the expansion valve 60 causes the refrigerant from the pipe P ₂ to flow into the evaporator 40 as an expansion refrigerant through the pipes 61, 62, 63. On the other hand, when the water supply valve Wv is opened as described above, water is supplied from the water supply source 32 into the outer tub 20a through the pipe 31. Therefore, the water in the outer tub 20a is cooled by the evaporator 40 according to the inflowing refrigerant. as a result,
Cold water in the outer tub 20a is frozen 41b, 42b, 43b on the outer peripheral surface of each of the cooling pipes 41 to 43 of the evaporator 470 as shown by the two-dot chain line in FIGS.

In such a state, when the surface level of the cold water in the outer tub 20a rises as water is supplied to the outer tub 20a and reaches the height of each communication hole 22b of the inner tub 20b, the cold water in the outer tub 20a It begins to flow into the inner tank 20b through the communication hole 22b.
After that, the surface level of the cold water in the outer tank 20a further rises to exceed the position of the chain double-dashed line Lb, and each communication hole 22 of the inner tank 20b is passed.
When the height reaches a, the float 84 of the water level sensor 80 moves upward as shown in FIG. 7 (B) to contact the stopper 82c and open the REIT switch 80b. At this time, the relay coil Rw remains in the self-holding state when the relay switch Wb is closed.

After that, the surface level of the cold water in the inner tank 20b changes to the inner tank 20b.
It rises with the inflow of cold water from the outer tub 20a through the communication holes 22a and 22b into the inside, and the dash-dotted line Ld (see FIG. 1).
Of the float 94 of the water level sensor 90
Moves up from the position shown in FIGS. 7 (A) and (B), contacts the stopper 92c as shown in FIG. 7 (C), and opens the reed switch 90b. Then, the relay coil Ry is demagnetized by opening the reed switch 90b to close the relay switch Y, and the electromagnetic contactor 110 closes the relay switch Zb and the coil 11 accompanying the closing of the relay switch Y.
By exciting 0a, each magnet switch 110b is closed to drive the motor Mib. For this reason, the internal circulation pump Pib is driven to draw the cold water in the outer tub 20a through the pipe P ₅ into the inner tub 20b through the pipe P ₆ through its upper end opening. At this time, both relay switches wc, W
d remains open. Further, the thermoswitch Th is assumed to be in the open state.

When the surface level of the cold water in the inner tank 20b further rises and becomes higher than the position of the chain double-dashed line Lc, the float 93 of the water level sensor 90 moves upward and the stopper 9 as shown in FIG. 7 (D).
2a, the reed switch 90a is closed, the reed coil Rx is excited, and the reed switch X is closed. Then, after the surface level of the cold water in the inner tank 20b further rises and reaches the upper end opening of the inner tank 20b, the surface level of the cold water common to the outer tank 20a and the inner tank 20b becomes the double-dot chain line La (fourth (See the drawing), the float 83 of the water level sensor 80 rises and contacts the stopper 82a as shown in FIG. 7 (E) to close the reed switch 80a. Then, the relay coil Rv is excited in response to the closing of the reed switch 80a to open both relay switches Va and Vc and close both relay switches Vb and Vd.

Then, the water supply valve Wv is closed in response to the opening of the relay switch Va from the water supply source 32 via the pipe 31 to the outer tub 20a.
The water supply to the inside is cut off, the relay coil Rw is released from the self-holding by the opening of the relay switch Vc, the relay switch Wb is opened, and each relay switch Wa, W
c and Wd are closed, and the relay coil Rz is the relay switch V.
It is excited by the closing of d to close the relay switch Za and open the relay switch Zb. In this case, the relay coil Rv is in the self-holding state when the relay switches Wa and Wb are closed, and the relay coil Rz is in the self-holding state when the relay switches X and Za are closed. In addition, since the relay switch Zb is opened even when both the relay switches Wc and Wd are closed while the thermo switch Th is open, the electromagnetic contactor 110 causes the magnet switch 1 to move.
By opening 10b, the motor Mib, that is, the internal circulation pump Pib is stopped while prohibiting the start of the motor Mia. As a result, the water supply into the outer tub 20a and the inner tub 20b is completed. In such a case, the cold water in the outer tank 20a and the cold water in the inner tank 20b is cooled by the evaporator 40 and the cooling pipes 4 are cooled.
It is maintained at a low temperature (corresponding to the open state of the thermoswitch Th) by the cooling action of ice formation 1-43. The electromagnetic contactor 120 is excited by the coil 120a associated with the closing of the relay switch Y as described above.
Since closing the 20b, external circulation pump Po is, the cold water in the inner tank 20b is driven by pumping through a pipe P ₇ are refluxed in tank 20b through a pipe P ₈ by the motor Mo. When the freezing detection switch S is opened, the relay coil Ru opens the relay switch U due to its demagnetization, the gas valve GV is closed, and the pressure switch PS is opened by the increase in the internal pressure of the discharge side pipe of the compressor 50.

In this state, cold brining fresh food, when various processes such as fish dressing process, by opening both the respective external faucet Fc, of the pipe p ₈ through a pipe P ₇ from the inner tank 20b by an external circulation pump Po The cold water pumped into the upstream portion flows out from each external faucet Fc. In such a case, the cold water flowing out from each external faucet Fc is 10 (° C) as described above.
Since the temperature is maintained in the vicinity, the temperature of the cold water is a temperature suitable for the manual work of the worker. Therefore, the worker can easily perform the above-mentioned various treatments using the cold water. In addition, since the temperature of the cold water flowing out from the external faucet Fc is automatically adjusted to a temperature in the vicinity of 10 (° C.) as described above, it is necessary to add a mixing faucet to each external faucet Fc to add tap water. This eliminates the need for troublesome work such as manually adjusting the mixing amount, and also eliminates the need for the mixing faucet and its piping system, which is effective in reducing the cost of this type of cold water supply device.

When the surface level of the cold water in the water tank 20 decreases to the chain double-dashed line La as the cold water flows out from each of the external faucets Fc as described above, the float 83 of the water level sensor 80 descends, and FIG. As shown in F), the reed switch 80a is opened by contacting the stopper 82b. At this time, the relay coil R
v remains in the self-holding state when both relay switches Wa and Vb are closed. When the surface level of the cold water in the water tank 20 is lowered to the upper end opening of the inner tank 20b and then the surface level of the cold water in the inner tank 20b is lowered to the alternate long and two short dashes line Lb, the float 84 of the water level sensor 80 is lowered. As shown in (A) and (F), the reed switch 80 is brought into contact with the stopper 82d.
Close b. Note that, when the surface of the cold water in the inner tank 20b is lower than that in the communication holes 22a, the cold water in the outer tank 20a starts flowing into the inner tank 20b through the communication holes 22a.

When the reed switch 80b is closed as described above, the relay coil Rw is excited to close the relay switch Wb and open the relay switches Wa, Wc, Wd. Then, the relay coil Rv is released from the self-holding state by opening the relay switch Wa and demagnetized to close both relay switches Va and Vc, and at the same time to both relay switches Vb and V.
d is opened, and the relay coil Rw is relay switch Wb, V
When c is closed, the self-holding state is established, and when the motor Mia is opened, both relay switches Wc and Wd are placed in the operation prohibited state. Further, the water supply valve Wv is opened by closing the relay switch Va to start the water supply from the water supply source 32 through the pipe 31 into the outer tub 20a. The relay coil Rz is in the self-holding state before the relay switch Vd is opened.

When the water supply is started as described above, the amount of water flowing into the inner tank 20a due to the water supply is the external circulation pump P.
When the amount of cold water sucked from the inner tub 20b into the pipe P ₇ by ₀ is larger, the surface level of the chilled water in the inner tub 20b starts to rise without much lowering, and the state of the water level sensor 80 becomes the first level. The state of FIG. 7 (F) changes to the state of FIG. 7 (D) through the state of FIG. 7 (D) in the same manner as described above, and the replenishment of the water supply into the outer tub 20a is the same as the above. To end. In such a case, even if water is replenished in the outer tub 20a as described above, the amount of this replenished water is not so large, so the replenishment water should almost raise the temperature of this chilled water to the existing chilled water in the outer tub 20a. Instead, they mix and flow into the inner tank 20b through the communication holes 22a and 22b. Therefore, the cold water flowing out from each external faucet Fc can be used while always ensuring the amount of cold water in the inner tank 20b at a temperature in the vicinity of 10 ° C. automatically and automatically. The required amount of cold water can be constantly secured at an appropriate temperature.

Further, when the water supply as described above is started, the amount of water flowing into the inner tank 20a by the feed water, relative to the amount of cold water is sucked from the inner tank 20b into the pipe P ₇ by an external circulation pump P ₀ When the amount is low, the surface level of the cold water in the inner tank 20b decreases according to the outflow amount of the cold water from each external faucet Fc. After that, when the surface level of the cold water in the inner tank 20b reaches the position of the chain double-dashed line Lc, the water level sensor 90
Float 93 falls and contacts the stopper 92b to open the relay switch 90a as shown in FIG. 9 (G). Then, the relay coil Rx is demagnetized in response to the opening of the reed switch 90a, opens the relay switch X, and releases the self-holding state of the relay coil Rz.

Then, when the relay coil Rz is demagnetized by being released from the self-holding state to open the relay switch Za and close the relay switch Zb, the electromagnetic contactor 110 excites the coil 110a when the relay switch Y is closed, thereby magnetizing each magnet. The switch 110b is closed to drive the motor Mib. At this time, the motor Mia has both relay switches W
The stopped state is maintained under the opening of c and Wd. Then,
When the motor Mib is driven as described above, the internal circulation pump Pib is, piping cold water on the bottom side of the outer tub 20a P ₅
Rapidly replenished while minimizing the temperature rise by mixing with cold water of the inner tank the inner tank caused to flow down into the 20b from the suction piping P ₆ through.

Then, the surface level of the cold water in the inner tank 20b is changed to the two-dot chain line L.
When rising above c, the float 93 of the water level sensor 90
Of the reed switch 90
a is closed, and in response thereto, the relay coil Rx is excited to close the relay switch X. When the surface level of the cold water in the inner tank 20a rises in this state and the reed switch 80b of the water level sensor 80 is opened in the same manner as described above and then the reed switch 80a is closed, the relay coil Rv is demagnetized. Both relay switches Va and Vc are opened, both relay switches Vb and Vd are closed, the water supply valve Wv is closed by the opening of the relay switch Va to stop the above water supply action, and the relay coil Rw is self-held by the opening of the relay switch Vc. Is released from the relay switch Wb and the relay switches Wa, Wc and Wd are closed, and the relay coil Rz closes the relay switch Za while the relay switch Vd closes and closes the relay switch Za and the relay switch Zb. open.

At this stage, if the thermoswitch Th has already been opened, the electromagnetic contactor 110 opens each magnet 110b by opening the relay switch Zb to stop the motor Mib, that is, the internal circulation pump Mib, and the motor Mi.
Prohibit start of a. On the other hand, if the thermoswitch Th is closed when the relay switch Zb is opened as described above, the motor Mia responds to the above-mentioned closing of the relay switches Wc and Wd under the operation of the motor Mib. Then, the internal circulation pump Pia sucks the bottom side cold water in the inner tank 20b through the pipe P ₃ and pumps it into the injection pipe 70 through the pipe P ₄ , and the injection pipe 70 sends the same cold water to each injection hole. It ejects from 71 to 71 in the direction of the arrow A shown in FIG.

Then, the cold water jetted from each of the jet holes 71 to 71 of the jet pipe 70 causes the cold water existing between the inner peripheral wall of the outer tank 20a and the evaporator 40 to flow counterclockwise as shown in FIG. It collides with the outer circumference of 40. In such a case, the freezing ice 43 attached to the cold water pipe 43 of the evaporator 40
b melt | dissolves according to the counterclockwise flow of the cold water as mentioned above, becomes cold water, and is mixed with the said flowing cold water smoothly, and in cooperation with the cooling effect of the evaporator 40 only, the outer tank 2
Since the cold water in 0a is cooled more rapidly, the cold water supplied from the outer tank 20a to the inner tank 20b through the pipes P ₅ and P ₆ is rapidly cooled in the inner tank 20b by the internal circulation pump Pia. Mix in cold water. Therefore, the inner tank 20
Since the temperature of the cold water in b rapidly decreases to a value near 10 ° C. even if the amount of cold water flowing out from each external faucet Fc is large,
It is possible to carry out various treatment operations with cold water of appropriate temperature at all times.

As described above, when the amount of cold water flowing out from each external faucet Fc is larger than the amount of water supplied from the water supply source 32 into the inner tank 20b, the surface level of the cold water in the inner tank 20b is two points. When the water reaches the position of the chain line Lc, the cold water in the inner bottom portion of the outer tub 20a is circulated by the internal circulation pump Pib in both pipes P ₅ ,
The water flowing through the communication holes 22a, 22b into the inner tank 20b is automatically cooled and replenished automatically by flowing P ₆ through the upper opening of the inner tank 20b. When the temperature of the cold water in the inner tank 20b is high and the thermo switch Th is closed at the completion of this replenishment, the internal circulation pump Pib is driven under the operation of the internal circulation pump Pia to Cold water from the injection pipe 70 to the outer tank 2
0a to cause the same to flow in the same direction in the outer tub 20a to melt the freezing ice on the outer peripheral side of the evaporator 40 into low-temperature cold water, and the low-temperature cold water is smoothly mixed with the flowing cold water to form an evaporator. Combined with the cooling action of 40, the temperature of the cold water in the outer tank 20a is rapidly lowered and the cold water in the outer tank 20a is automatically supplied to the inner tank 20b.
Therefore, even if the temperature of the cold water in the inner tank 20b is temporarily increased, the temperature of the cold water is rapidly decreased, and the temperature of the cold water flowing out from each external faucet Fc is always maintained at an appropriate temperature. It does not hinder the cold water treatment.

Further, in the automatic adjustment of the temperature of the cold water as described above, since the peripheral wall of the inner tank 20b is formed of a heat insulating material, it is possible to more appropriately prevent the temperature of the cold water in the inner tank 20b from decreasing. Further, in achieving the above-described effects, the outer circumference of the inner tank 20b provided in the outer tank 20a is surrounded,
Since the evaporator 40 is arranged in the outer tank 20a, the water tank of this type of cold water supply device can be made compact.

In addition, as described above, when the surface level of the cold water in the inner tank 20b is lowered to the alternate long and two short dashes line Lc, and when the level is further reduced to the alternate long and two short dashes line Ld, the float 94 of the water level sensor 90 is lowered. The reed switch 90b is closed by abutting on the stopper 92d, the relay coil Ry is excited to open the relay switch Y, and the electromagnetic contactor 110 is opened by the magnet switch 110b to open the motors Mia, M.
Stop ib and Mo. Thereby, the operation of the device of the present invention can be prevented when the cold water in the inner tank 20b is insufficient.

In implementing the present invention, the thermoswitch Th
What is the operating temperature of? The temperature is not limited to 10 (° C.), and may be changed as needed. Further, the mounting position of the thermoswitch Th is not limited to the pipe P ₇ and may be any position that can detect the temperature of the cold water in the inner tank 20b. Further, various temperature sensors may be adopted instead of the thermoswitch Th.

In implementing the present invention, the external circulation pump Po is used.
Is not limited to the inside of the base 10, and may be arranged outside the base 10, for example, near each external faucet Fc.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a device body of a chilled water supply device according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an electric control circuit diagram for various electric elements of FIG. 1, and FIG. FIG. 5 is an enlarged view of the water level sensor attached to the auxiliary tank of the apparatus body, FIG. 5 is an enlarged view of the same water level sensor, FIG. 6 is an enlarged view of the water level sensor installed in the inner tank, and FIGS. ) Is an operation explanatory view of both water level sensors. Explanation of reference numerals 20 ... water tank, 20a ... outer tank, 20b ... inner tank, 32
…… Water supply source, 40 …… Evaporator, 50 …… Compressor, 80 …… Water level sensor, Fc …… External faucet, Mi
b, Mo ... Motor, P ₀ ... External circulation pump, Pib
...... internal circulation _{pump, P 5, P 6, P} 7, P 8 ...... pipe, Rv, Rw, Rx, Ry, Rz ...... relay coil,
Th ... Thermo switch, Va-Vd, Wa, Wb,
X, Y, Za, Zb ... Relay switch, Wv ... Water supply valve.

Claims (4)

[Claims] 1. An outer tank (20a) standing upright on an installation surface and an inner tank (20b) standing upright inside the outer tank, and the water in the outer tank is inside the upper peripheral wall of the inner tank. Multiple communication holes (22a,
22b) forming a water tank (20), and a water supply means (31, W _v ) for allowing water from a water supply source (32) to flow into the outer tank when the water tank is in an operating state. External water flow system (P ₇ , P ₀ ,
M ₀ , P ₈ ) and a refrigeration cycle (40, Un) having an evaporator (40) fitted in the outer tank so as to surround the inner tank and cooling water in the outer tank by the evaporator An external faucet means (F _c ) which is interposed in the external reflux system and causes the water in the external reflux system to flow out to the outside; Replenishing means (P ₅ , Pib, Mib, P ₆ ) for replenishing the inside and a water level for detecting whether the water level in the outer tank is higher or lower than the lower limit level and the upper limit level at a position higher than at least the communication hole, respectively. Detecting means (80) and temperature detecting means (Th) for detecting the temperature of the water in the inner tank
And when the water level detecting means detects that the water level in the outer tank is lower than the lower limit level, the water supply means is put into an operating state and the water level in the outer tank is higher than the upper limit level by the water level detecting means. When it is detected, the first control means (V
a, Wa, Vb, Rv, Wb, Vc, Rw), and second control means for controlling the replenishing means to be in an operating state when the temperature detected by the temperature detecting means is higher than a predetermined temperature range ( 110) and an ice storage type cold water supply device. 2. An ice storage type cold water supply device, wherein the inner tank (20b) according to claim 1 is formed of a heat insulating material. 3. The ice storage type cold water supply device according to claim 1, wherein the second water level detecting means (90a) detects that the water level in the inner tank (20b) is lower than a predetermined low level. And when the second water level detecting means detects that the water level in the inner tank is lower than a predetermined low level, the replenishing means (P ₅ , Pib, Mib, P ₆ ) is set to the predetermined water level. The third control means (Rx, X, Rz, Zb, 80a, Rv, V
d, Za) and ice storage type cold water supply device. 4. The ice storage type cold water supply device according to claim 1, wherein the second water level detecting means (90b) detects that the water level in the inner tank (20b) has become lower than a predetermined low level. And when the second water level detecting means detects that the water level in the inner tank is lower than a predetermined low level, the operation of the external reflux system (P ₇ , P ₀ , M ₀ , P ₈ ) is started. Prohibition means (R
y, Y) and the ice storage type cold water supply device.