JP2018105591A - Water supply server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply server capable of setting an appropriate pause time for cooling, increasing the supply capacity of chilled water, and realizing a chilled water display that does not give a sense of discomfort to the supplied chilled water. A water supply server (water server 2) that provides cold water, a cold water tank (4) that generates cold water (LW) from the water supply (W) and supplies the cold water, and a cooling device that cools the water supply of the cold water tank (water server 2). 6), a temperature sensor (8) that detects the chilled water temperature of the chilled water tank, a first reference temperature and a second reference temperature higher than the first reference temperature are set in the temperature range of the chilled water, and the chilled water temperature is set. When a predetermined time has elapsed from the time when the temperature drops to the first reference temperature, the operation of the cooling device is stopped, the chilled water temperature rises to the second reference temperature, and the predetermined time elapses from the stop of the operation of the cooling device. It is provided with a control unit (10) for operating the cooling device. [Selection diagram] Fig. 1

Description

The present invention relates to a temperature control technique for cold water of a water supply server such as a water server, and a display thereof.

A water server that generates hot water and cold water from the water supply and supplies it to the cold water tank, and supplies cold water by heat exchange with the refrigerant circulating in the evaporator wrapped around the cold water tank. Is generated. This cold water temperature control realizes a desired cold water temperature by controlling the cooling device based on the temperature detected by a temperature sensor installed in the cold water tank.
With regard to this water supply cooling, it is known to cool a beverage without excess or deficiency by controlling the cooling device by using a relatively small capacity cooling device (Patent Document 1).

JP-A-8-285429

  By the way, the specification which controls the cold water temperature of a water server to the temperature range of 6 [degreeC]-12 [degreeC], for example is common. When the chilled water in the chilled water tank is consumed, water is supplied to the chilled water tank at room temperature by the amount of chilled water consumed, and the chilled water temperature of the chilled water tank rises due to this water supply. If the cold water consumption is frequent, the temperature rise of the cold water becomes remarkable. In order to control the chilled water temperature within the range of 6 [deg.] C. to 12 [deg.] C., the operation of the cooling device and its stop are repeated. If the tank capacity of the chilled water tank is small relative to the amount of chilled water consumed, The repetition becomes more prominent.

  It is essential for the protection of the cooling circuit and the compressor that both the operation time and the pause time of the cooling device continue for 5 minutes or more. If the pause time is short and the operation and the stop are repeated frequently, the cooling device There is a problem that the life of the cooling device is shortened due to wear and failure of the cooling circuit. In the cold water tank, the water in the vicinity of the evaporator is easily frozen, and the freezing becomes more remarkable in the still water state. Therefore, the operation of the cooling device must be suppressed to a temperature range in which the inside of the cold water tank does not freeze. Since the density of water is highest in the vicinity of 4 [° C.], there is a problem that it becomes difficult to control the temperature in the vicinity of 6 [° C.], which is the lower limit temperature of the cold water temperature. In the water supply server installed in the home, there is a problem that noise occurs when the operation of the cooling device and the stop thereof are repeated frequently.

  In this water supply server, there is a problem that cold water having different temperatures is supplied even with the same cold water display. For example, in the cold water supply at 7 [° C.], when the usage amount increases, the cold water temperature of the cold water tank rises due to the water supply. When the chilled water temperature exceeds, for example, 12 [° C.], the display switches to a chilled water display indicating the temperature rise and notifies the user of the temperature rise. When the temperature exceeds 12 [° C.], the cooling device starts to operate, and the cold water temperature falls to a temperature lower than 12 [° C.]. At this time, even if the display is switched to the cold water display, although the cold water is lower than 12 [° C.], warm cold water is supplied as compared with the cold water supply of 7 [° C.]. That is, there is a problem that the cold water display is uncomfortable with the same display as 7 [° C.] with respect to the warm cold water. However, there is a problem that providing a plurality of cold water displays according to temperature changes is not convenient.

Accordingly, in view of the above-described problems, an object of the present invention is to set an appropriate downtime for cooling and to increase the supply capacity of cold water.
Another object of the present invention is to realize a cold water display that does not give a sense of incongruity to the supplied cold water.

  In order to achieve the above object, according to one aspect of the water supply server of the present invention, there is provided a water supply server for providing cold water controlled to a predetermined temperature, a cold water tank that generates cold water from the water supply and supplies the cold water; A cooling device that cools water supplied to the cold water tank, a temperature sensor that detects a cold water temperature of the cold water tank, a first reference temperature in a temperature region of the cold water, and a second higher than the first reference temperature. When a predetermined time elapses from the time when the reference temperature is determined and the cold water temperature is lowered to the first reference temperature, the operation of the cooling device is stopped, the cold water temperature rises to the second reference temperature, and the cooling A control unit is provided for operating the cooling device when a predetermined time has elapsed since the operation of the device was stopped.

  The water supply server further includes display means for changing a display form to a first display or a second display according to the cold water temperature, and the control unit is higher in temperature range of the cold water than the second reference temperature. When the third reference temperature is determined and the chilled water temperature rises above the third reference temperature, the first display is changed to the second display, and the chilled water temperature that rises above the third reference temperature is When the temperature falls to the second reference temperature, the second display is continued in the temperature transition section from the temperature lower than the third reference temperature to the second reference temperature, and when the temperature falls below the second reference temperature, the The second display is changed to the first display.

In the water supply server, the temperature sensor may be installed at a predetermined interval from an installation position of the cooling device installed in the cold water tank.
In the water supply server, the cold water may include a temperature range of at least 6 [° C.] to 12 [° C.].

According to the water supply server of the present invention, one of the following effects can be obtained.
(1) According to the invention described in claim 1, since the start of the operation of the cooling device is performed only after the predetermined time has elapsed from the stop of the operation without depending only on the rise in the temperature of the chilled water, the cooling device and the cooling circuit Therefore, it is possible to protect the cooling device and the cooling circuit, and to protect the cooling device and the cooling circuit from wear and failure, thereby extending their life.
(2) When the operation of the cooling device is started, the operation is extended from the time when the chilled water temperature drops to a predetermined temperature until the lapse of a predetermined time, so that the chilled water temperature in the chilled water tank is cooled to a predetermined temperature or less and supercooled. Therefore, the supply capacity of cold water can be increased. That is, it is possible to make up for frequent provision of cold water by compensating for a decrease in the generation of cold water due to the downtime of the cooling device.

(3) By ensuring the downtime of the cooling device and extending the operating time of the cooling device, it is possible to suppress frequent operations and stoppages that follow changes in the chilled water temperature, and to suppress noise due to repeated operation and stoppages.
(4) According to the invention described in claim 2, when the chilled water temperature rises due to excessive chilled water supply, the chilled water temperature can be displayed by switching the chilled water display from the first display to the second display.
(5) Even if the temperature of the chilled water decreases due to the operation of the cooling device, when the display is shifted from the first display to the second display, the second temperature with the reference temperature lower than the reference temperature used for switching from the first display to the second display is displayed. Since the display is switched to the first display, it is possible to avoid the inconvenience of the first display due to the supply of lukewarm cold water, and to eliminate the uncomfortable feeling that occurs between the temperature of the provided cold water and the cold water display.

It is a figure which shows the water server which concerns on 1st Embodiment. It is a flowchart which shows the process sequence of cold water control. A is a figure which shows the water server which concerns on 2nd Embodiment, B is a flowchart which shows the process sequence of cold water display control. 1 is a diagram illustrating a water server according to a first embodiment. A is a figure which shows a cold water tank, B is sectional drawing which shows a cold water tank. It is a figure which shows an operation panel part. It is a figure which shows the hardware of a control part. It is a flowchart which shows the process sequence of cold water control. It is a figure which shows a basic operation timing. It is a figure which shows the operation | movement timing in case cold water temperature does not rise more than reference temperature within the stop time of a cooling device. It is a figure which shows the operation | movement timing when the chilled water temperature rises more than reference temperature within the stop time of a cooling device. It is a figure which shows the operation | movement timing when excessive chilled water consumption arises in the operation | movement time of a cooling device. It is a figure which shows the operation | movement timing containing a display operation in case a cold water display is switched from a 2nd display to a 1st display. It is a figure which shows the result of the supercooling control after the high temperature circulation which concerns on Example 2. FIG.

[First Embodiment]
FIG. 1 shows a water server according to the first embodiment. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.
The water server 2 is an example of a water supply server that supplies hot water or cold water, and is hereinafter referred to as “server 2”. The server 2 includes at least a cold water tank 4, a cooling device 6, a temperature sensor 8, and a control unit 10.
The cold water tank 4 is supplied with water supply W from the water supply mechanism 12 and stores cold water LW cooled by the cooling device 6. The water supply mechanism 12 may use a water supply in addition to a drinking water supply pack. The cooling device 6 is installed in the cold water tank 4 and circulates the refrigerant, for example, includes an evaporator or a compressor, and the cooling device 6 may be driven or stopped by driving or stopping the compressor.
The cold water LW in the cold water tank 4 is supplied from the cold water supply mechanism 14 and consumed. At this time, the cold water tank 4 is supplemented with the water supply W for the consumption of the cold water LW through the water supply mechanism 12. The water supply W is normally at normal temperature, and the cold water temperature Ts in the cold water tank 4 varies depending on the consumption of the cold water LW. The cold water temperature Ts is detected by the temperature sensor 8, and the detected temperature is provided to the control unit 10 and used for controlling the cooling device 6.

The control unit 10 is at least a control unit of the cooling device 6 and is configured by a computer, for example. The control unit 10 takes in time information from the timer 16 and the cold water temperature Ts detected by the temperature sensor 8 as control information, and controls the operation time and the stop time of the cooling device 6. Setting information and control of the control unit 10 are as follows.
a. A first reference temperature Tr1 and a second reference temperature Tr2 higher than the first reference temperature Tr1 are determined in the temperature region of the cold water LW.
b. As time information representing a predetermined time measured by the timer 16, a first time ta and a second time tb are determined. The time ta is a fixed time measured from the time when the chilled water temperature Ts drops to the reference temperature Tr1 during the operation of the cooling device 6, and the time tb is a fixed time measured from the stop time of the cooling device 6. . The lengths of the times ta and tb may be ta ≧ tb, for example.
c. When the time ta elapses from the time when the cold water temperature Ts drops to the reference temperature Tr1, the cooling device 6 is stopped.
d. When the chilled water temperature Ts rises above the reference temperature Tr2 and the time tb has elapsed since the cooling device 6 was stopped, the cooling device 6 is operated.

<Cooling water temperature control>
FIG. 2 shows a processing procedure for temperature control of the cold water. In this processing procedure, reference temperatures Tr1 and Tr2 (> Tr1) are set in the temperature region of the cold water LW in the initial setting. With the start of this processing procedure, the cold water temperature Ts is taken in by detecting the temperature of the temperature sensor 8 (S101). It is determined whether or not Ts ≧ Tr2 for this cold water temperature Ts (S102). If Ts ≧ Tr2 is not satisfied (NO in S102), the process returns. If Ts ≧ Tr2 is satisfied (YES in S102), it is determined whether time tb has elapsed since the operation of the cooling device 6 was stopped (S103).
Even if Ts ≧ Tr2, if the time tb has not elapsed since the operation of the cooling device 6 was stopped (NO in S103), the process returns. If Ts ≧ Tr2 and the time tb has elapsed from the stop of the operation of the cooling device 6 (YES in S103), the cooling device 6 is activated (S104).

  At this time, the cold water temperature Ts is taken in (S105), and it is determined whether Ts ≦ Tr1 (S106). If Ts ≦ Tr1 is not satisfied (NO in S106), the operation of the cooling device 6 is continued (S107). Return to S105. If Ts ≦ Tr1 (YES in S106), it is determined whether the time ta has elapsed since the time when Ts decreased to the reference temperature Tr1 (S108). If the time ta has not elapsed since the time when Ts = Tr1 was lowered (NO in S108), the operation of the cooling device 6 is continued, and if the time ta has elapsed since the time when Ts = Tr1 was lowered (S108). (YES), operation | movement of the cooling device 6 is stopped (S109), and it returns.

<Effect of the first embodiment>
According to this server 2, the following effects can be obtained.
(1) Since the cooling device 6 starts to operate after a lapse of time tb from the stoppage of operation, a downtime necessary for protecting the cooling device 6 and the refrigerant circuit is secured, and the cooling device 6 and the refrigerant circuit are worn or broken. And the life of the cooling device 6 and the refrigerant circuit can be extended.
(2) When the operation starts, the cooling device 6 stops the operation after the time ta has elapsed from the time when the chilled water temperature Ts drops below the reference temperature Tr1. As a result, the operation time of the cooling device 6 is extended by the time ta, so that the cold water LW is supercooled. Thereby, it can prepare for provision of frequent cold water LW, and even if the cold water tank 4 is a small capacity | capacitance, the supply capability of the cold water LW can be improved and the capacity | capacitance reduction of the cold water tank 4 can be achieved.

(3) Even if the generation function of the cold water LW decreases during the downtime of the cooling device 6, the cold water LW generation function is supplemented by the overcooling of the cold water LW by extending the operation of the cooling device 6 at the time ta, and the frequent cold water LW It is possible to sufficiently cope with the supply.
(4) If the time ta, tb is set to ta ≧ tb, the cooling time of the cold water LW becomes longer than the pause time of the cooling device 6, and the supercooling of the cold water LW proceeds, so the supply capacity of the cold water LW is increased. be able to.

[Second Embodiment]
FIG. 3A shows the server 2 according to the second embodiment. In FIG. 3A, the same parts as those in FIG.
The server 2 includes at least a cold water tank 4, a cooling device 6, a temperature sensor 8, a control unit 10, and a cold water display unit 18. Since the cold water control is the same as that of the first embodiment for the cold water tank 4, the cooling device 6, the temperature sensor 8, and the control unit 10, the description thereof is omitted.

  The control unit 10 is a control means for at least the control of the cooling device 6 and the display control of the chilled water display unit 18, and uses the time information of the timer 16 and the detected temperature of the temperature sensor 8 as control information to control the chiller 6 and chilled water. Execute display control. The cold water display unit 18 controlled by the control unit 10 includes a cold water display lamp 18-1 for displaying the first display x and a cold water display lamp 18-2 for displaying the second display y. For example, a green light emitting diode (LED) may be used as the cold water display lamp 18-1, and an orange light emitting LED may be used as the cold water display lamp 18-2.

The setting information and control of the control unit 10 are as follows.
e. A third reference temperature Tr3 higher than the second reference temperature Tr2 is determined.
f. When the cold water temperature Ts rises above the reference temperature Tr3, the first display x is changed to the second display y.
g. When the chilled water temperature Ts that has risen above the reference temperature Tr3 falls to the second reference temperature Tr2, the second display y is maintained in the temperature transition section from below the reference temperature Tr3 to the reference temperature Tr2, and falls below the reference temperature Tr2. Then, the second display y is changed to the first display x.

<Cold water display control>
FIG. 3B shows a processing procedure for cold water display control. In this processing procedure, reference temperatures Tr1, Tr2 (> Tr1), Tr3 (> Tr2) are set in the temperature control region of the cold water LW in the initial setting. By starting this processing procedure, the cold water temperature Ts is taken in by detecting the temperature of the temperature sensor 8 (S201). It is determined whether or not Ts ≧ Tr3 for this cold water temperature Ts (S202).

  If Ts ≧ Tr3 is not satisfied (NO in S202), the first display x is performed (S203), and the process returns. If Ts ≧ Tr3 (YES in S202), the first display x is changed to the second display y (S204). The cold water temperature Ts is taken in (S205), and it is determined whether the cold water temperature Ts has decreased from Ts ≧ Tr3 to Ts ≦ Tr2 (S206). If Ts ≦ Tr2 (YES in S206), the process proceeds to S203, and the display is switched from the second display y to the first display x (S203). If Ts ≦ Tr2 is not satisfied (NO in S206), the second display y is maintained (S207), and the process returns to S205.

<Effects of Second Embodiment>
According to this server 2, the following effects can be obtained.
(1) When the cold water temperature Ts rises above the reference temperature Tr3 due to frequent provision of the cold water LW, the cold water display is changed from the first display x to the second display y. Is notified from the second display y that the chilled water LW is frequently supplied in excess of expectations and the chilled water temperature Ts in the chilled water tank 4 has increased.

(2) As described in the first embodiment, the cooling device 6 enters the operation state when the time tb elapses from the stop of the operation, so that the cold water temperature Ts falls below the reference temperature Tr3. However, even if the chilled water temperature Ts falls below the reference temperature Tr3, if the reference temperature Tr2 is exceeded, the second display y is continuously displayed and is not changed to the first display x. That is, even if the chilled water temperature Ts is equal to or lower than the reference temperature Tr3, if the reference temperature Tr2 is exceeded, the cold chilled water LW is provided. At this time, when the display is changed to the first display x, the display and the chilled water temperature are changed. A sense of incongruity is caused in the relationship with Ts, and even if the cold water LW is normally consumed, a sense of incongruity is caused when the temperature exceeds the reference temperature Tr3. Therefore, once the chilled water temperature Ts exceeds the reference temperature Tr3, the second display y is maintained until it falls below the reference temperature Tr2, and when the chilled water temperature Ts falls below the reference temperature Tr2, the first display is displayed from the second display y. Since it switches to x, the discomfort between a cold water display and the provided cold water temperature Ts can be eliminated. That is, the uncomfortable feeling of the cold water temperature Ts expected for the cold water display can be eliminated, and the display reliability can be improved.

FIG. 4 illustrates the server 2 according to the first embodiment. 4, the same parts as those in FIG. 1 or 3 are denoted by the same reference numerals.
A water supply mechanism 12 is provided on the upper portion of the housing 20 of the server 2. The water supply W from the water supply pack 22 installed in the water supply mechanism 12 is guided to the cold water tank 4 from the water supply port 24. The water supply valve 26 installed in the water supply port 24 is provided with an opening / closing mechanism 30 that opens and closes by raising and lowering the float unit 28 due to the water level of the cold water tank 4. When the water level of the cold water tank 4 reaches the upper limit water level, the water supply valve 26 is closed, and when the water level drops due to the supply of the cold water LW, the water supply valve 26 is opened by the lowering of the float 28 and the water supply W is consumed by the cold water LW. It is supplied to the cold water tank 4 by the amount. Thereby, the water level of the cold water tank 4 is maintained at a constant water level (upper limit water level) by closing the water supply valve 26. An evaporator 34 of the cooling device 6 is installed in the cold water tank 4, and a refrigerant pumped by a compressor 36 circulates in the evaporator 34 during cooling. The water supply W is cooled by heat exchange with the refrigerant, and cold water LW is generated. The cold water temperature Ts is detected by the temperature sensor 8. The cold water temperature Ts is taken into the control unit 10 from the temperature sensor 8.

The cold water LW of the cold water tank 4 is provided by the cold water supply mechanism 14. In this example, the cold water electromagnetic valve 40 is provided in the cold water supply path 38 connected to the bottom of the cold water tank 4, and the cold water LW is provided from the cold water inlet 42 by operating the cold water electromagnetic valve 40 by the control unit 10.
Below the cold water tank 4 is provided a hot water tank 44 that heats the feed water W and provides the hot water HW. The hot water tank 44 is provided with a water supply pipe 48 from the center of the separation plate 46 arranged in the cold water tank 4, and the water supply W guided to the cold water tank 4 is supplied to the hot water tank 44 through the water supply pipe 48.
The hot water tank 44 and the cold water tank 4 are provided with a bypass pipe 50 as a conduit for guiding the hot water HW from the cold water tank 4 to the cold water tank 4 during high temperature sterilization. The bypass pipe 50 is provided with a bypass valve 52 that is controlled to be opened by the control unit 10 during high-temperature water circulation.

<Cold water tank 4>
As shown in FIG. 5A, an evaporator 34 is wound around the cold water tank 4. A refrigerant circulates in the evaporator 34 from the refrigerant circuit 54 of the cooling circuit, the feed water W is cooled in the cold water tank 4, and cold water LW is generated in the cold water tank 4.
As shown in FIG. 5B, the temperature sensor 8 is installed in the cold water tank 4 while avoiding the evaporator 34 by providing a distance d between the temperature sensor 8 and the installation position of the evaporator 34 in the cold water tank 4. If the temperature sensor 8 is installed in this way, there is no direct influence of the cooling function of the evaporator 34, the freezing of the temperature sensor 8 is avoided, and a decrease in the detection accuracy of the cold water temperature Ts can be prevented.

<Operation panel unit 56>
FIG. 6 shows the operation panel unit 56 of the server 2. The operation panel unit 56 is provided with a lock release switch 58 at the center, and a cold water switch 60 and a hot water switch 62 are provided with the lock release switch 58 interposed therebetween. The cold water supply mode is executed when the cold water switch 60 is pressed, and the hot water supply mode is executed when the hot water switch 62 is pressed.
On the upper side of the cold water switch 60, a cold water display unit 18 and a light cold display unit 66 are provided. The cold water display unit 18 includes a cold water display lamp 18-1 used for the first display x and a cold water display lamp 18-2 used for the second display y. The light cold display unit 66 includes a light cold display lamp 67, and lights up when light cold.

<Control unit 10>
As shown in FIG. 7, a computer is used as the control unit 10 and includes a processor 68, a memory unit 70, a multi-timer 72 as a timer, and an input / output unit (I / O) 74. The processor 68 executes an OS (Operating System) and water cooling control programs stored in the memory unit 70. The memory unit 70 is a storage unit that stores a program for performing an OS, water cooling control, and the like, and stores a ROM (Read-Only Memory), a RAM (Random-Access Memory), an EEPROM (Electrically Erasable Programmable Read-Only Memory), and the like. It is composed of elements.

The multi-timer 72 provides a plurality of timing information. Based on the control of the control unit 10, the timing information includes time information for a predetermined time from the stop of the cooling device 6 and from the time when the chilled water temperature Ts decreases to the reference temperature Tr1. Time information representing the predetermined time is provided to the control unit 10.
Based on the control of the control unit 10, the I / O 74 takes in detection information of the temperature sensor 8 and the like, operation information of the chilled water switch 60, and the control information and driving information of the control unit 10 as chilled water display lamps 18-1 and 18 2 and the functional means such as the compressor 36.

<Cooling water control and display control procedures>
FIG. 8 shows a processing procedure in the cold water mode. This cold water mode includes cold water display lamp control and compressor control based on the cold water temperature Ts. The cold water temperature Ts is taken from the temperature sensor 8 (S301), and display control of the cold water display lamps 18-1 and 18-2 is performed. First, it is determined whether the cold water display lamp 18-1 is lit (green) (S302). If the green light is being lit (YES in S302), it is determined whether the cold water temperature Ts exceeds the reference temperature Tr3 (= 12 [° C.]) (S303). If Ts> 12 [° C.] (YES in S303), the cold water display lamp 18-1 is turned off, the cold water display lamp 18-2 is switched on (orange) (S304), and the process proceeds to S305. Unless Ts> 12 [° C.] (NO in S303), the cold water display lamp 18-1 is kept on (green), and the process proceeds to S305.

If it is determined in S302 that the light is not green (NO in S302), that is, if the cold water display lamp 18-2 is lighted in orange, is the cold water temperature Ts less than the reference temperature Tr2 (= 7 [° C.])? Is determined (S306). If Ts <7 [° C.] (YES in S305), the cold water display lamp 18-2 is turned off, and the cold water display lamp 18-1 is switched on (green) (S307), and the process proceeds to S305. If Ts <7 [° C.] is not satisfied (NO in S306), the cold water display lamp 18-2 is kept lit in orange, and the process proceeds to S305.
In S305, in order to ensure safety, it is determined whether the cold water temperature Ts exceeds a reference temperature Tr4 (= 83 [° C.]) necessary for ensuring safety. If Ts> 83 [° C.] (YES in S305), all processes are terminated and returned to ensure safety.

If Ts> 83 [° C.] is not satisfied (NO in S305), that is, if Ts ≦ 83 [° C.], safety is ensured, and the control shifts to control of the cooling device 6, that is, compressor control. In the compressor control, first, it is determined whether the compressor 36 is stopped (S308). If the compressor 36 is stopped (YES in S308), it is determined whether time tb (= 5 [minutes]) or more has elapsed since the compressor 36 was stopped (S309). If 5 minutes or more have not elapsed since the compressor 36 was stopped (NO in S309), the process returns.
If 5 minutes or more have elapsed from the stop of the compressor 36 (YES in S309), it is determined whether Ts> Tr2 (= 7 ° C.) (S310). If Ts> 7 [° C.], the process returns. If Ts> 7 [° C.] (YES in S310), the compressor 36 is started (S311), and the compressor operation flag indicating the operation state is set to 1 (S312). To return.

  If the compressor 36 is not stopped in S308 (NO in S308), it is determined whether the compressor operation flag = 1 (S313). If the compressor operation flag = 1 (YES in S313), it is determined whether the chilled water temperature Ts is lower than the reference temperature Tr1 (= 6.5 [° C.]) (S314). If Ts <6.5 [° C.] (YES in S314), the compressor operation flag is set to 2 (S315), the time measurement of the multi-timer 72 is reset and time measurement is started (S316), and the compressor operation is continued. Return processing procedure.

  If the compressor operation flag is not 1 (if = 2) as a result of the determination in S313 (NO in S313), the time ta (= 7 [min]) is detected after detecting the cold water temperature Ts = 6.5 [° C]. It is determined whether the above has elapsed (S317). If 7 minutes or more have not elapsed since the detection time of Ts = 6.5 [° C.] (NO in S317), the processing procedure is returned in a state where the compressor operation is continued. If 7 minutes or more have elapsed since the detection time of Ts = 6.5 [° C.] (YES in S317), the operation of the compressor 36 is stopped (S318), the time measurement of the multi-timer 72 is reset, and the time measurement is performed. (S319) and return.

<Cold water control and display control>
(1) Basic operation (Fig. 9)
9A shows the transition of the cold water temperature Ts, FIG. 9B shows the operation and stop of the cooling device 6, and FIG. 9C shows the operation of the cold water display lamp 18-1. When the cooling device 6 shifts from the stopped state to the operating state at time t1, the chilled water temperature Ts is lowered. The operation of the cooling device 6 is continued until the time ta from the time t2 when the chilled water temperature Ts passes the reference temperature Tr1 (= 6.5 [° C.]) to the time t3 has elapsed. By continuing this operation, the cold water LW becomes supercooled (below 6.5 ° C.).

The cooling device 6 stops at time t3 when the time ta elapses, and the chilled water temperature Ts starts to increase at the time t3. The stop time of the cooling device 6 is a time tb from the time point t3 to the time point t4.
The chilled water temperature Ts exceeds the reference temperature Tr2 before the transition to the time point t4, but since the time tb has not elapsed since the time point t3, the cooling device 6 starts operating at the time point t4, whereby the chilled water temperature Ts is lowered. Become.
During a period in which the time point t4 passes from before the time point t1, the cold water display lamp 18-1 representing the first display x is lit in green.

(2) When the chilled water temperature Ts does not rise above the reference temperature Tr2 within the cooling device 6 stop time (FIG. 10).
In FIG. 10, the same parts as those in FIG. 9 are denoted by the same reference numerals, and the description thereof is omitted. When the chilled water temperature Ts is lower than the reference temperature Tr2 from the time t3 when the cooling device 6 stops operating to the time tb, the time when the chilled water temperature Ts reaches the reference temperature Tr2 after the time tb has elapsed. The operation of the cooling device 6 is delayed until t5. That is, if the chilled water temperature Ts is lower than the reference temperature Tr2, it is not necessary to cool, and the operation of the cooling device 6 is continuously stopped, and an energy saving effect can be expected.
During the period from time t1 through time t5, the cold water display lamp 18-1 representing the first display x is lit in green.

(3) When the chilled water temperature Ts rises above the reference temperature Tr2 within the downtime of the cooling device 6 (FIG. 11)
This is a case where chilled water consumption occurs at times t4 to t5 within the downtime of the cooling device 6 and the cold water temperature Ts rises to the reference temperature Tr2 or higher during the downtime of the cooling device 6. Even if the chilled water temperature Ts rises to the reference temperature Tr2 or higher at the time point t5 within the quiescent time of the cooling device 6 as described above, the cooling device 6 maintains the stopped state and operates from the operation stop time point to the time point t6 when the time tb elapses. The stop is maintained and the cooling device 6 is operated at time t6.
During the period from time t1 to time t6, the cold water display lamp 18-1 representing the first display x is lit in green.

(4) When excessive chilled water consumption occurs during the operation time of the cooling device 6 (FIG. 12)
When excessive chilled water consumption occurs between time t5 and time t6 during operation of the cooling device 6 and the chilled water temperature Ts exceeds the reference temperature Tr3, the chilled water display lamp 18-1 of the first display x is lit in green at time t6. The cold water display lamp 18-2 for the second display y is switched to orange lighting. Thereby, since the cold water temperature Ts in the cold water tank 4 rose and exceeded the reference temperature Tr3, it can be notified that the cold cold water LW is provided.

(5) When the cold water display is switched from the second display y to the first display x (FIG. 13)
As shown in FIG. 13, as a result of excessive chilled water consumption occurring from time t5 to time t6, the chilled water temperature Ts exceeding the reference temperature Tr3 at time t6 due to the water supply W is the operation of the cooling device 6 if there is no chilled water consumption. It will be in a descending state. The operation of the cooling device 6 continues until the time ta from time t8 when the chilled water temperature Ts passes the reference temperature Tr1 to time t9. As described above, by continuing this operation, the cold water LW is supercooled and the cold water temperature Ts decreases.

Even if the chilled water temperature Ts rises above the reference temperature Tr3 and then starts to fall, during the cooling period from the time point t6 to t7, when the first display x temporarily shifts to the second display y, the second display y is displayed. The cold water display lamp 18-2 continues to light orange. Accordingly, the cold water display in the section in which the cold cold water LW is supplied even in the cold water mode is the second display y, that is, the cold water display lamp 18-2 is lit in orange.
When the chilled water temperature Ts continues to drop and falls below the reference temperature Tr2, the chilled water display lamp 18-1 that is the first display x is switched from green to green at the time t7.

<Effect of Example 1>
According to the first embodiment, the following effects can be obtained.
(1) The same effects as those of the first and second embodiments can be obtained.
(2) Even if the chilled water temperature Ts falls below the reference temperature Tr1 during the operation of the cooling device 6, the operation is continued for a predetermined time from that point, so that the chilled water LW is supercooled and the supply capacity of the chilled water LW is enhanced.
(3) Even if the chilled water temperature Ts becomes equal to or higher than the reference temperature Tr2 while the cooling device 6 is stopped, the operation of the cooling device 6 is stopped until a predetermined time elapses from the stop of the operation, and sufficient cooling time is given to the cooling device 6. The cooling device 6 and the refrigerant circuit 54 can be protected, and the lifetime can be extended.

  FIG. 14 is a diagram illustrating a result of supercooling control after high-temperature circulation according to the second embodiment. In Example 2, using the cold water tank 4 according to Example 1, supercooling control was performed after high-temperature water circulation during high-temperature sterilization, that is, the supercooling state by extending the operating time of the cooling device 6 at time ta was confirmed. According to this result, in FIG. 14, A is a change in the chilled water temperature Ts at a height of 70 mm from the bottom of the chilled water tank 4, and B is a height of 40 mm from the bottom of the chilled water tank 4. A change C in the cold water temperature Ts indicates a change in the cold water temperature Ts at a height of 10 mm from the bottom of the cold water tank 4. As is apparent from this result, it was confirmed that the cold water temperature Ts decreased to a range of 5 [° C.] to 12 [° C.] and changed within this range.

[Other Embodiments]
In the above-described embodiments and examples, a water supply server that provides hot water and cold water has been exemplified, but the present invention may be a water server that provides only cold water, or a refrigerator that has a cold water supply function. The present invention is not limited to the embodiments and examples.
As described above, the most preferable embodiment of the water supply server has been described. The present invention is not limited to the above description. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. It is included in the scope of the present invention.

According to the water supply server of the present invention, a sufficient pause time of the cooling device and the refrigerant circuit is ensured, and the chilled water is supercooled by extending the operation time without depending on the rise of the chilled water temperature. Since the supply capacity is increased, it is possible to perform highly convenient water supply control, which is beneficial.

DESCRIPTION OF SYMBOLS 2 Water server 4 Cold water tank 6 Cooling device 8 Temperature sensor 10 Control part 12 Water supply mechanism 14 Cold water supply mechanism 16 Timer 18 Cold water display part 18-1 Cold water display lamp 18-2 Cold water display lamp 20 Case 22 Water supply pack 24 Water supply port 26 Water supply valve 28 Float part 30 Opening / closing mechanism 34 Evaporator 36 Compressor 38 Chilled water supply path 40 Chilled water electromagnetic valve 42 Chilled water port 44 Hot water tank 46 Separating plate 48 Water supply pipe 50 Bypass pipe 52 Bypass valve 54 Refrigerant circuit 56 Operation panel part 58 Lock release switch 60 Cold water switch 62 Hot water switch 66 Light cold display 67 Light cold display lamp 68 Processor 70 Memory 72 Multi-timer 74 Input / output (I / O)

Claims (4)

A water supply server that provides cold water controlled to a predetermined temperature,
A cold water tank for generating cold water from the water supply and supplying the cold water;
A cooling device for cooling the water supply of the cold water tank;
A temperature sensor for detecting a cold water temperature of the cold water tank;
When a first reference temperature and a second reference temperature higher than the first reference temperature are determined in the temperature range of the cold water, and a predetermined time has elapsed since the cold water temperature has dropped to the first reference temperature. A controller that stops the operation of the cooling device, causes the cold water temperature to rise to the second reference temperature, and operates the cooling device when a predetermined time elapses after the operation stop of the cooling device;
A water supply server characterized by comprising: Furthermore, it comprises display means for changing the display form to the first display or the second display according to the cold water temperature,
When the third reference temperature higher than the second reference temperature is set in the cold water temperature region and the cold water temperature rises above the third reference temperature, the control unit starts from the first display to the second reference temperature. When the chilled water temperature that has risen above the third reference temperature falls to the second reference temperature, the display changes, and the temperature transition section extends from less than the third reference temperature to the second reference temperature. 2. The water supply server according to claim 1, wherein the second display is continued and the second display is changed to the first display when the temperature drops below the second reference temperature.   The water supply server according to claim 1 or 2, wherein the temperature sensor is installed at a predetermined interval from an installation position of the cooling device installed in the cold water tank. The water supply server according to any one of claims 1 to 3, wherein the cold water includes a temperature range of at least 6 [° C] to 12 [° C].

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