JPH0816574B2 - 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 disposed 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 in from an external faucet through an external piping system as needed, and is used for the above-mentioned various treatments.

(Problems to be Solved by the Invention) However, in the above-described conventional device, the water in the water tank is directly cooled by the evaporator, so the water temperature in the water tank may be too low. Also, since the water tank is directly supplied with water from an external water source, if a large amount of water in the water tank is used and water is supplied from the external water source, the temperature of the cold water in the water tank will rapidly increase. It goes up. As a result, according to the above-mentioned conventional apparatus, there are cases where the cold water is too cold for an operator to work with the cold water, or cold water at a stable temperature cannot be constantly supplied to the external piping system. There's a problem.

The present invention has been made to address the above problems,
An object of the invention is to provide an ice storage type cold water supply device capable of stably supplying cold water at a temperature at which an operator can work.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a structural feature of the present invention is that a water tank (20) is formed of two tanks (20a, 20b) inside and outside, and both tanks communicate with each other at the top. , A refrigeration cycle (Un) having an evaporator (40) housed in one of the two tanks inside and outside and cooling water in the same tank by the same evaporator,
Water supply means (31, W _V ) for supplying water to the one tank from the outside
If, the other external faucet means selectively which water flows out in the middle same refluxed with recirculating water in the tank outlet to the other tank to the outside of said inner and outer tank (F _C) An ice storage type cold water supply device provided with an external reflux system (P ₇ , Po, P ₈ ) having, a temperature detecting means (Th) for detecting the temperature of water in the other tank, and optionally When activated, pump means (Pia, Pia, for supplying the water in the other tank to the one tank at the same time)
P ₃ , P ₄ ) and control means (110) for operating the pump means when the detected temperature is higher than a predetermined temperature.

(Effects of the Invention) In the present invention configured as described above, the water tank is composed of two tanks, the inner tank and the outer tank, which communicate with each other at the upper part, and the water in one tank is cooled by the evaporator and the same tank is externally supplied. The water in the other tank is directly cooled by the evaporator because the water in the other tank is guided to the external recirculation system and is discharged from the external faucet. There is no such thing, and it is indirectly cooled by being mixed with cold water in one tank, and the worker performs cold water treatment such as cold salt water treatment and fish dressing treatment using cold water having a higher temperature than the above conventional equipment. It is possible to do the same work easily. Further, the temperature of the cold water in the other tank, that is, the temperature of the cold water supplied to the external reflux system is also stabilized. Further, when the temperature of the water in the other tank rises and the temperature detected by the temperature detecting means becomes higher than a predetermined temperature, the control means operates the pump means to remove the water in the other tank from the one of the one. Supply to the tank. Therefore, the water supplied to the one tank from the other tank mixes with the cold water in the same tank, and the water level of the cold water in the same tank rises. The temperature of the cold water flowing into the other tank gradually decreases. As a result, the temperature of the cold water supplied to the external return system does not change rapidly and becomes stable.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings, and FIGS. 1 and 2 show the entire ice storage type cold water supply device according to the present invention. The main body of the device is a box-shaped base 10,
It is equipped with a water tank 20 vertically fixed on this base 10.
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 such a case, the peripheral wall and the bottom wall of the outer tub 20a are heat-insulating layer 2
On the other hand, the peripheral wall 22 of the inner tank 20b is covered with 1, and is made of a heat insulating material having a good heat insulating property. The outer tank 20
The height of the upper end opening of a is higher than that of the upper end opening of the inner tank 20b (see FIG. 1).

Along the entire circumference of the peripheral wall 22 of the inner tank 20b, a pair of upper and lower communicating holes 22a, 22b are formed near the upper end opening of the inner tank 20b as shown in FIG. Communication hole 22
The a and 22b connect the inside of the inner tank 20b to the inside of the outer tank 20a.
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 automatic water supply device 30 has a water supply source 32 (about 20 (At a temperature of ℃) is supplied into the outer tub 20a through the water supply pipe 31 under the selective opening of the water supply valve Wv interposed in the water supply pipe 31.

Inside the outer tank 20a, the hollow columnar evaporator 40 is
Is arranged so as to concentrically surround from the outside, and the evaporator 40 is constituted by three layers of cooling pipes 41, 42 and 43 which are spirally and concentrically arranged. The outflow upper ends of the respective cooling pipes 41, 42 and 43 of the evaporator 40 pass through the respective pipes 41a, 42a, 43a, the connector 44 and the pipe P ₁ which respectively extend upward from the respective outflow upper ends via the lid 20c, Base 1
Compressor 50 built in the refrigeration cycle unit Un in 0
It is connected to the.

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 high-temperature and high-pressure compressed refrigerant. This capacitor is a fan motor FM
The compressed refrigerant from the compressor 50 is condensed under the air-cooling action (see FIG. 3) and applied to the expansion valve 60 through the receiver (not shown) and the pipe P ₂ . The expansion valve 60 expands the inflowing refrigerant and causes the expansion refrigerant to flow into the cooling pipes 41, 42, 43 of the evaporator 40 from the inflow end portions thereof through the pipes 61, 62, 63. This means that the evaporator 40 cools the water in the outer tub 20a according to the inflowing refrigerant and freezes 41b, 42b, 43b on the outer circumference of each cooling pipe 41, 42, 43. The pipes 61, 62, 63 extend 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 is driven by the built-in motor M _ia (see FIG. 3) of the cold water in the inner tank 20b. Inner tank 2
Piping P ₃ extending from the bottom wall of 0b into the base 10 through its top wall
Pumping and pumping into the pipe P ₄ through. In such cases, piping
P ₄ extends upward along the outer periphery of the outer tank 20a through the upper wall of the base 10, and the tip of this pipe P ₄ is the outer tank 20a.
It extends in a U shape through a lid 20c and is connected to the upper end of the injection pipe 70. The injection pipe 70 is erected in the outer tank 20a between its inner peripheral surface and the outer peripheral surface of the evaporator 40. The peripheral wall of the injection pipe 70 has a plurality of injection holes along its vertical direction. 71, ..., 71 are provided at intervals. In this case, each injection hole 71, ..., 71 is an evaporator.
It faces the outer peripheral surface of 40 at an acute angle (refers to the angle formed by 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,
This internal circulation pump Pib has a built-in motor Mib (3rd
(See the figure), the cold water in the outer tank 20a
Pumping pipe P ₆ through a pipe P ₅ extending from the bottom wall of 0a (corresponding to the outside of the bottom wall of the inner tank 20b) into the base 10 through the top wall thereof.
Pump it in. In such a case, the pipe P ₆ extends upward along the outer periphery of the outer tub 20a via the upper wall of the base 10.
The tip of this pipe P ₆ is covered with a lid 2 directly above the upper end opening of the inner tank 20b.
The internal circulation pump P extends in the shape of U through 0c into the inner tank 20b.
Allow cold water from ib to flow down.

The external circulation pump Po is arranged in the base 10, and the external circulation pump Po is driven by the motor Mo (see FIG. 3) built therein to cool the cold water in the inner tank 20b. Tank 20b
Is pumped into the pumping pipe P ₈ through a pipe P ₇ extending from the bottom wall of the base into the base 10 via the upper wall thereof. In such a case, pipe P ₈
Is disposed at an appropriate position (for example, a back yard of a supermarket) extending outward through the side wall of the base 10, and the tip of this pipe P ₈ is placed in the inner tank 20b via the lid 20c. The external circulation pump Po
The cold water from the above is refluxed into the inner tank 20b. Also, pipe P ₈
A plurality of external faucet Fc in the middle portion of, ..., and Fc are connected, each of these external faucet Fc, ..., Fc is cold water in the pipe P ₈ is selectively opened operations Drain. The total length of the pipe P 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 commercial power source of three-phase 200V, 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 excited by receiving a transformation voltage from both common conductors Ta and Tb only when the normally closed type ice detection switch S is closed. This relay coil Ru constitutes a relay together with the normally open type relay switch U, and the relay coil Ru closes the relay switch U by its selective excitation. The gas valve GV is installed in the outlet side pipe of the compressor 50. The gas valve GV is opened only when the relay switch U is closed and receives the transformation voltage from both common conductors Ta and Tb to open the compressor 50. To allow the refrigerant to be supplied to the condenser. The freezing detection switch S detects and opens the freezing of the evaporator 40 when the freezing is completed. The symbol L indicates a pilot lamp.

The relay coil Rv constitutes a relay together with the normally closed relay switches Va, Vc and the normally open relay switches Vb, Vd.The relay coil Rv selectively closes the normally open reed switch 80a of the water level sensor 80. Both common conductors Ta, Tb
It is excited by receiving the transformation voltage from. The relay switch Va is closed under the demagnetization of the relay coil Rv, and both common conductors Ta, Tb
The transformer voltage from is applied to the water supply valve Wv to open it. Further, the relay switch Va is opened by exciting the relay coil Rv to close the water supply valve Wv. Relay switch
Vb is closed by the excitation of the relay coil Rv, and under the closing of the relay switch Wa, the transformed voltage from both common conductors Ta and Tb is applied to the relay coil Rv and self-maintained. Relay switch
Vc 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 an outer tank as shown in FIG. 2 and FIG.
It is arranged in a cylindrical auxiliary tank 20d attached to the upper end of the outer peripheral wall of 20a. The auxiliary tank 20d is vertically supported by fitting the peripheral wall bottom portion thereof to the outer end portion of the connection support pipe 23 extending outward from the outer peripheral wall upper end portion of the outer tank 20a. Cold water in the outer tank 20a flows into the inside through a connecting pipe 23. The water level sensor 80 includes a rod 82 vertically supported on the inner peripheral surface of the auxiliary tank 20d through upper and lower stays 81a and 81b.
(See FIG. 4 and FIG. 5)
Includes a pair of upper and lower annular stopper pieces 82a, 82b and 82c, 82d.
Are coaxially fitted.

A reed switch 80a is built in the portion of the rod 82 corresponding to the hollow portion of the stopper piece 82a, while the rod 8
A normally closed reed switch 80b (see FIG. 3) is built in a portion of the second stopper piece 82c corresponding to the hollow portion. Further, an annular float 83 is loosely fitted in the portion of the rod 82 between the stopper pieces 82a, 82b so as to be movable up and down according to the surface level of the cold water in the auxiliary tank 20d. It has a built-in magnet. Then float 83
However, as shown in FIGS. 4 and 5, the reed switch 80a maintains the open state when locked on the stopper piece 82b. In addition, the float 83 moves upwards and the stopper piece
When locked to 82a, the reed switch 80a is closed by the permanent magnet in the float 83.

On the other hand, in the part between the stoppers 82c and 82d of the rod 82,
An annular float 84 is loosely fitted 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 84. Float 84
As shown in FIGS. 4 and 5, the reed switch 80b maintains the closed state when it is locked on the stopper piece 82d. When the float 84 moves upward, the float 84 is locked to the stopper piece 82c, and the reed switch 80b is opened. However, when 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 coincides with the chain double-dashed line La as shown in FIGS. 4 and 5, the float 83 is placed on the stopper 82b. It is designed to be locked. The surface level of the cold water in the auxiliary tank 20d is, as shown in FIGS. 4 and 5, the peripheral wall 2 of the inner tank 20b.
The float 84 is adapted to be locked on the stopper 82d when it coincides with the position between the two communication holes 22a and 22b (shown by the chain double-dashed line Lb). The reference numeral 24 in FIG. 4 indicates a heat insulating layer.

The relay coil Rw is a normally closed relay switch Wa, Wc, Wd.
And a normally open type relay switch Wb, which constitutes a relay, and this relay coil Rw is excited by receiving a transformation voltage from between both common conductors Ta and Tb only when the relay switch 80b is closed. The relay switch Wa opens only when the relay coil Rw is excited. Relay switch Wb is a relay coil
It is closed only when Rw is excited, and when the relay switch Vc is closed, the transformation voltage from both common conductors Ta and Tb is applied to the relay coil R.
Give it to w and let it 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. This relay coil Rx is a water level sensor.
Only when the normally open type reed switch 90a of 90 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 20b, and the water level sensor 90 has the same structure as the water level sensor 80. In such a case, each stay 91a, 91b, rod 92, each stopper piece 92a, 92b, 92c, 92d of the water level sensor 90, each float 93, 94 is each stay 81a, 81b, rod 82, each stopper piece 82a of the water level sensor 80. , 8
2b, 82c, 82d, and floats 83, 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 is locked on the stopper 92b, and the surface level is the double-dashed chain line Ld.
The float 94 is adapted to lock on the stopper 92d when it coincides with. 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 type 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 outputs a transformation voltage from between both common conductors Ta and Tb when the relay switch Vd is closed. Received and excited. Relay switch Za is a relay coil
It is closed by exciting Rz, and under the closing of the relay switch X, the transformer coil Rz is applied with a transforming voltage from between the common conductors Ta and Tb and held by itself. The relay switch Zb is opened by exciting the relay coil Rz.

The normally closed type thermoswitch Th is attached to the pipe P ₇ (see Fig. 1), and the temperature of the cold water in the pipe P ₇ is lower than the preset temperature (for example, 10 (° C)). It will be opened. However, the thermoswitch Th is connected to the relay switch Zb. The electromagnetic contactor 100 has a coil 100a.
And a normally open magnet switch 100b to 100b, and the coil 100a is excited by receiving a transformation voltage between both common conductors Ta and Tb only when the normally closed pressure switch PS is closed. . 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 P
S 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, and the coil 110a has both common conductors Ta, when both relay switches Y, Zb and the thermoswitch Th are closed. It is excited by receiving the transformer voltage between Tb. Each of the magnet switches 110b to 110b is closed only when the coil 110a is excited, and the three-phase commercial voltage from the commercial power source is supplied to the motor Mi.
It is applied to b to drive it, and the same three-phase commercial voltage is applied to the motor Mib while both relay switches Wc and Wd are closed to drive it.

The electromagnetic contactor 120 has a coil 120a and normally open magnet switches 120b to 120b. 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 magnet switch 120b ~
The coil 120a is closed only when the coil 120a is excited, and a three-phase commercial voltage from a commercial power source is applied to the motor Mo to drive it.

In the present embodiment configured as described above, a 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
Lights up, 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 is closed by the pressure switch PS and each magnet is closed. The switches 100b to 100b are closed, and the three-phase commercial voltage from the commercial power source is applied to both motors CM and FM to drive them, and the water supply valve Wv 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 and the relay switch Wb
And close each relay switch Wa, Wc, Wd. 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 demagnetized when the relay switch 90a is opened, and the relay coil Ry is excited when the relay switch 90b is closed to open the relay switch Y and open the coil 120a of the electromagnetic contactor 120. In the demagnetized state, the relay coil Rz is in the demagnetized state when the relay switches Vd, Za, X are opened. Both water level sensors 80 and 90 are in the state shown in FIG. 7 (A).

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

In such a state, when the surface level of the cold water in the outer tank 20a rises with the supply of water into the outer tank 20a and reaches the height of each communication hole 22b of the inner tank 20b, the cold water in the outer tank 20a becomes Communication hole 22
It begins to flow into the inner tank 20b through b. After that, when the surface level of the cold water in the outer tank 20a further rises and reaches the height of each communication hole 22a of the inner tank 20b beyond the position of the alternate long and two short dashes line Lb, the float 84 of the water level sensor 80 moves to the seventh position. As shown in FIG. 8B, the reed switch 80b is opened by contacting the stopper 82c and moving upward. At this time, the relay coil Rw remains in the self-holding state under the closing of the relay switch Wb.

Then, the surface level of the cold water in the inner tank 20b rises with the inflow of cold water from the outer tank 20a into the inner tank 20b through the communication holes 22a, 22b, and the chain double-dashed line Ld (see FIG. 1). The float 94 of the water level sensor 90 becomes higher than the position of FIG. 7 (A) (B).
When the reed switch 90b is opened by contacting the stopper 92c as shown in FIG. Then
The relay coil Ry is demagnetized by opening the reed switch 90b to close the relay switch Y, and the electromagnetic contactor 110 is excited by the coil 110a accompanying the closing of the relay switch Y when the relay switch Zb is closed.
Close 0b to drive the motor Mib. Therefore, the internal circulation pump Pib is driven to draw the cold water in the outer tub 20a through the pipe P _{5 and} into the inner tub 20b through the pipe P ₆ through the upper end opening thereof. At this time, both relay switches wc and Wd remain open. In addition, the thermoswitch Th is assumed to be in the open state.

The surface level of the cold water in the inner tank 20b rises further and the two-dot chain line L
When it goes above the position of c, the float 93 of the water level sensor 90
Moves up and contacts the stopper 92a as shown in FIG. 7D, the reed switch 90a is closed, and the reed coil Rx is excited to close the reed switch X. Then, the inner tank 20b
After the surface level of the cold water inside 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 is the position of the chain double-dashed line La (see FIG. 4). When it becomes higher than this, the float 83 of the water level sensor 80 rises and abuts 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, and both relay switches Va,
Open Vc and close both relay switches Vb and Vd.

Then, the water supply valve Wv closes in response to the opening of the relay switch Va, shuts off the water supply from the water supply source 32 through the pipe 31 into the outer tub 20a, and the relay coil Rw is released from the self-holding by opening the relay switch Vc. Then, the relay switch Wb is opened and the relay switches Wa, Wc, Wd are closed, and the relay coil Rz is excited by the closing of the relay switch Vd to close the relay switch Za and open the relay switch Zb. In such a case, the relay coil Rv is
When a and Wb are closed, it becomes a self-holding state, and the relay coil Rz becomes a self-holding state when both relay switches X and Za are closed. Even if both relay switches Wc and Wd are closed when the thermo switch Th is open, the relay switch Zb opens, so that the magnetic contactor 110 is connected to each magnet switch 110b.
The start of the motor Mia prohibits the start of the motor Mia,
ib, that is, the internal circulation pump Pib is stopped. This allows
Water supply to the outer tank 20a and the inner tank 20b is completed. In this case, the cold water in the outer tub 20a and the inner tub 20b is maintained at a low temperature (corresponding to the open state of the thermoswitch Th) by the cooling action of the evaporator 40 and the cooling action of the frost on the cooling pipes 41 to 43. Since the electromagnetic contactor 120 closes each magnet switch 120b by exciting the coil 120a accompanying the closing of the relay switch Y as described above, the external circulation pump Po is
Driven by the motor Mo, the cold water in the inner tank 20b is pumped out through the pipe P ₇ and is returned to the inner tank 20b through the pipe P ₈ . When the icing 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 the compressor.
Opened when the internal pressure of the 50 discharge side pipe increases.

In such a state, when the external faucet Fc is opened together in various treatments such as cold salt water treatment of fresh food and dressing treatment of fish, the external circulation pump Po can be used to connect the pipe P ₇ from the inner tank 20b.
Each external faucet cold water pumped in the upstream portion of the pipe p ₈ through
It flows out from Fc. In such a case, the cold water flowing out from each external faucet Fc is maintained at a temperature near 10 (° C) as described above, so 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. Moreover, the temperature of the cold water flowing out from the external faucet Fc is automatically adjusted as described above.
Since the temperature is adjusted to around 10 (℃), each external faucet
No need for troublesome work such as adding a mixing faucet to Fc and manually adjusting the mixing amount of tap water, and also eliminating the need for the mixing faucet and its piping system to reduce the cost of this type of cold water supply device. It is valid.

When the surface level of the cold water in the water tank 20 decreases to the chain double-dashed line La with the outflow of cold water from each of the external faucets Fc as described above, the float 83 of the water level sensor 80 descends, and FIG. 7 (D).
As shown in (F), the reed switch 80a is opened by contacting the stopper 82b. At this time, the relay coil Rv remains in the self-holding state with both relay switches Wa and Vb closed. When the surface level of the cold water in the water tank 20 drops to the upper end opening of the inner tank 20b and then the surface level of the cold water in the inner tank 20b drops to the alternate long and two short dashes line Lb, the float 84 of the water level sensor 80 drops and the temperature of the float 84 is lowered. As shown in (F), the reed switch 80b is closed by making contact with the stopper 82d. Note that, when the surface of the cold water in the inner tank 20b is lower than that in each communication hole 22a, the cold water in the outer tank 20a starts flowing into each inner hole 20b through each communication hole 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 each relay switch 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, open both relay switches Vb and Vd, and relay coil Rw.
Is in a self-holding state by closing both relay switches Wb, Vc, and the motor Mia is in an operation prohibited state by opening both relay switches Wc, Wd. Further, the water supply valve Wv is opened by closing the relay switch Va, and the water supply source 32
To start supplying water into the outer tub 20a. The relay coil Rz is in a 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 _0.
When the amount of cold water sucked from the inner tank 20b into the pipe P ₇ is larger than the above, the surface level of the cold water in the inner tank 20b starts to rise without much lowering, and the state of the water level sensor 80 becomes the seventh level. The state of FIG. (F) changes to the state of FIG. 7 (E) through the state of FIG. 7 (D) in the same manner as described above, and the replenishment of water supply into the outer tub 20a is the same as that described above. finish. In such a case, even if water is supplied to the outer tank 20a as described above,
Since the amount of this supplementary water is not so large,
The existing cold water in a mixes with the cold water with almost no increase in temperature and flows into the outer tank 20b through the communication holes 22a and 22b. Therefore, each external faucet Fc can be automatically secured while always ensuring the amount of cold water in the inner tank 20b at a temperature near 10 ° C.
Since the cold water flowing out from the can be used, the amount of cold water required for the work of the worker can be constantly secured at an appropriate temperature.

In addition, when water supply is started as described above,
Water flowing into the inner tank 20a by the feed water, if less than the amount of cold water is sucked from the inner tank 20b into the pipe P ₇ by an external circulation pump P ₀ is the cold water of the surface of the inner tank 20b The level decreases according to the amount of cold water flowing out from each external faucet Fc. Then, when the surface level of the cold water in the inner tank 20b reaches the position of the alternate long and two short dashes line Lc, the float 93 of the water level sensor 90 descends and abuts on the stopper 92b as shown in FIG. Open 90a. Then, the lead 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.

Next, when the relay coil Rz is demagnetized by releasing 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 under the closing of the relay switch Y to cause each magnet. The switch 110b is closed to drive the motor Mib. At this time, the motor Mia maintains the stopped state with both relay switches Wc and Wd open. Then, as mentioned above, the motor Mib
When the internal circulation pump Pib is driven, the cold water on the bottom side in the outer tank 20a is sucked through the pipe P ₅ and the inner tank 20b is discharged from the pipe P _6.
By making it flow down inside and mixing it with the cold water in the same tank, the temperature rise is suppressed as much as possible and rapid replenishment is performed.

After that, the surface level of the cold water in the inner tank 20b is Lc
When the water level sensor 90 rises, the float 93 of the water level sensor 90 rises to come into contact with the stopper 92a to close the reed switch 90a, and in response thereto, the relay coil Rx is excited to close the relay switch X. In such a state, the surface level of the cold water in the outer tub 20a rises and the reed switch 80b of the water level sensor 80
When the reed switch 80a is closed after opening in the same manner as described above, the relay coil Rv is demagnetized and both relay switches Va and Vc are opened and 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 connected to the relay switch Vc.
The relay switch Wb is released from the self-holding
Is opened and each relay switch Wa, Wc, Wd is closed, and the relay coil Rz closes the relay switch Za while the relay switch X is closed by closing the relay switch Vd and opens the relay switch Zb.

At this stage, if the thermoswitch Th is already 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 prohibit the start of the motor Mia. On the other hand, if the thermoswitch Th is closed when the relay switch Zb is opened as described above, the motor Mia is
Under the operation of the motor Mib, the relay switches Wc, Wd start in response to the above-mentioned closing, and the internal circulation pump Pia
2 sucks the bottom side cold water in the inner tank 20b through the pipe P ₃ and pumps it into the jet pipe 70 through the pipe P ₄ , and the jet pipe 70 sends the same cold water through the jet holes 71 to 71 as shown in FIG. It ejects in the direction of arrow A in the figure.

Then, the cold water jetted from the respective jet holes 71 to 71 of the jet pipe 70 causes the cold water existing between the inner peripheral wall of the outer tub 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 ice supply 43b adhering to the cold water pipe 43 of the evaporator 40 is melted according to the counterclockwise flow of the cold water as described above to become cold water, which is smoothly mixed with the flowing cold water, and the evaporator is cooled.
Combined with the cooling action of only 40, the cold water in the outer tank 20a is cooled more quickly, so that the inner circulation pump Pia
The cold water supplied from 0a through both pipes P ₅ and P ₆ into the inner tank 20b is rapidly cooled and mixed into the cold water in the inner tank 20b. Therefore, the temperature of the cold water in the inner tank 20b rapidly decreases to a value around 10 ° C even if the amount of cold water flowing out from each external faucet Fc is large, so that various treatments can always be performed with cold water of appropriate temperature. Can work.

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. Chain line Lc
When it drops to the position of, the cold water in the inner bottom of the outer tank 20a
Inner tank 20b through both pipes P ₅ and P ₆ by internal circulation pump Pib
Water is made to flow into the inner tank 20b through the communication holes 22a and 22b while being effectively cooled, and is automatically replenished. 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 set to the internal circulation pump Pia.
By driving the cold water in the inner tub 20b into the outer tub 20a from the injection pipe 70, the cold water in the outer tub 20a is caused to flow in the same direction to form ice on the outer peripheral side of the evaporator 40. Is dissolved into low-temperature cold water, and this low-temperature cold water is smoothly mixed with the flowing cold water, and in combination with the cooling action of the evaporator 40, the temperature of the cold water in the outer tank 20a is rapidly lowered while the outer tank 20a is being cooled. The cold water therein is automatically replenished into 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.

In addition, when automatically adjusting the temperature of cold water as described above,
Since the peripheral wall of the inner tank 20b is made of a heat insulating material, the inner tank 2
It is possible to more appropriately prevent the temperature of the cold water in 0b from decreasing.
In addition, in achieving the above-mentioned effects, the outer tank 20a
Since the evaporator 40 is arranged in the outer tank 20a so as to surround the outer circumference of the inner tank 20b provided therein, the water tank of this type of cold water supply device can be made compact.

Further, as described above, after the surface level of the cold water in the inner tank 20b is lowered to the chain double-dashed line Lc, the level is further changed to the chain double-dashed line.
When the water level sensor 90 is lowered to Ld, the float 94 of the water level sensor 90 is lowered to come into contact with the stopper 92d to close the reed switch 90b, and the relay coil Ry is excited by the relay switch Y.
The electromagnetic contactor 110 stops the motors Mia, Mib, Mo by opening the magnet switches 110b. 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
The operating temperature of 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. Also, the thermo switch Th
Instead of this, various temperature sensors may be adopted.

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

Further, in carrying out the present invention, the pipe P _{3 is connected} to the inner tank 20
Instead of the bottom wall of b, it may extend from the bottom wall of the outer tub 20a. In such a case, if both pumps Pia and Pib are driven together,
The capacity of the pump Pia can be considerably reduced.

Further, in carrying out the present invention, among the pair of upper and lower communication holes 22a, 22b of the inner tank 20b, the diameter of each lower communication hole 22b is increased so that each upper communication hole 22a is omitted. Good.

[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 symbols 20 …… water tank, 20a …… outer tank, 20b …… inner tank, 32 …… water supply source, 40 …… evaporator, 50 …… compressor, 80 ……
Water level sensor, Fc ...... outside faucet, Mib, Mo ...... motor, P ₀ ...
… External circulation pump, Pia …… Internal circulation pump, P ₃ , P ₄ , P ₇ ,
P ₈ …… Piping, Rv, Rw, Rx, Ry, Rz …… Relay coil, Th ……
Thermo switch, Va to Vd, Wa, Wb, X, Y, Za, Zb …… Relay switch, Wv …… Water supply valve.

Claims (1)

[Claims] 1. A water tank (20) consisting of two tanks (20a, 20b) inside and outside and having both tanks communicating at the top, and an evaporator (40) housed in one of the two tanks inside and outside. A refrigeration cycle (Un) for cooling water in the same tank by the same evaporator, and a water supply means (31, W _V ) for supplying water to the one tank from the outside
If, the other external faucet means selectively which water flows out in the middle same refluxed with recirculating water in the tank outlet to the other tank to the outside of said inner and outer tank (F _C) And an external reflux system (P ₇ , Po, P ₈ ) having an ice storage type cold water supply device for detecting the temperature of water in the other tank.
and h), and selectively actuated by the pump means to supply water in the other tank to the tank of the one during the operation _{(Pia, P 3, P 4} ), the detected temperature is higher than a predetermined temperature And a control means (110) for operating the pump means when the temperature is high.