JPH03286962A - Hot water supplying device - Google Patents

Abstract

PURPOSE:To enable a large amount of hot water of a predetermined temperature be instantly supplied by a method wherein a conduit is installed either at least by installing a cylindrical flowing element of a large diameter at its upper end or by setting a cylindrical flowing-out element of large diameter at its lower end. CONSTITUTION:A cold water conduit is comprised of a main body 1 of the conduit and a flowing-out element 2 disposed at a lower end of the conduit. The flowing-out element 2 is a cylindrical member having a larger diameter than that of the main body 1 of the conduit and is fixed at a lower end bent in a rightward direction of the main body 1 of the conduit while its axial direction is substantially coincided with its lower end. With such a mounting of the flowing-out element 2, a flowing-out speed of supplementary cold water into a thermal accumulation area 74 is decreased, and then an agitating action of the cold water and hot water in the thermal accumulation area 74 is restricted. As a result, a hot water reducing speed at the hot water area 73 is dampened and then a large amount of hot water of predetermined temperature can be supplied from the hot water area 73 instantly.

Description

[Detailed description of the invention] [Industrial application field]

The present invention particularly relates to a hot water supply device that is incorporated into a beverage vending machine and supplies hot water at a predetermined temperature to the outside based on a command.

[Conventional technology]

A hot water supply device used in a beverage vending machine is a device that supplies hot water at a predetermined temperature after being replenished with cold water so as to maintain a constant water level. This hot water supply device is required to obtain a large amount of hot water at a predetermined temperature in a short time. The conventional example will be explained with reference to FIG. 5, which is a sectional view thereof. In FIG. 5, the inside of the tank 71 is
A partition wall 72 separates an upper heated area 73 and a lower heat storage area 74.
It is divided into two parts. Note that a tank 71 is provided on the outer periphery of the partition wall 72.
There are communication portions 72a and 72b between the inner periphery of the hot water area 73 and the heat storage area 74, respectively. The warm water area 73 is connected to a replenishment cold water pipe 71a provided with a solenoid valve 71A above it, and a supply hot water pipe 71b provided with a t-magnetic valve 71B below, and also has a water level detector (level switch) 9. will be installed. A main heater 75 is provided in the hot water area 73, an auxiliary heater 77 is provided in the heat storage area 74, and a thermostat 76 is provided in the hot water area 73. In addition, the cold water conduit 78 is connected to the hot water area 73.
and a part of the heat storage area 74, and cold water from the cold water pipe 71a is introduced from the upper end and discharged from the lower end. The solenoid valve 71A is activated by a signal from the water level detector 9 to supply and stop cold water via the cold water pipe 71a.
The magnetic valve 71B is activated by the sales signal to connect the hot water pipe 7.
The main heater 7 supplies and stops hot water via 1b.
5 and the auxiliary heater 77 are turned on and off by a contact signal from the thermostat 76 to heat the warm water area 73 and the heat storage area 74, respectively, as will be described in detail later. Now, the main heater 75 is heated by being controlled on and off by the thermostat 76, with the predetermined temperature in the invention being set as the set temperature. Initially, the main heater 75 remains on, and is turned off when the temperature of the hot water area 73 reaches the set temperature. At the same time as the main heater 75 is turned off, the auxiliary heater 77 is turned on. By heating the auxiliary heater 77, each communication portion 72a provided on the outer periphery of the partition wall 72,
Through 72b, convection occurs across the warm area 73 and the heat storage area 74. As a result, when hot water is not supplied, the temperature of the hot water area 73 fluctuates in a zigzag pattern in a relatively narrow range between near the set temperature and slightly lower than the set temperature in the first stage.
Further, the temperature of the heat storage area 74 fluctuates in a zigzag manner in a temperature range slightly lower than the temperature range of the hot area 73 due to convection. The main heater 75 and the auxiliary heater 77 are configured so that the on state of the main heater 75 is given priority and they are not turned on at the same time. Main and auxiliary heaters 75.77
This is to limit power consumption since power consumption increases if both are turned on at the same time. When there is a command to supply hot water, the solenoid valve 71B opens and hot water is supplied to the outside from the hot water pipe 71b. At the same time, a drop in the water level due to this supply is detected by the water level detector 9, and based on this detection signal, the solenoid valve 71A is opened, and cold water is replenished from the cold water pipe 71a to maintain the water level constant. Now, since the replenishment cold water is supplied to the heat storage area 74 through the cold water conduit 78, the temperature of the heat storage area 74 first decreases, and then the hot water in the heat storage area 74 is pushed up to the hot water area 73, so that the temperature of the heat storage area 74 decreases. The temperature also decreases. Based on this temperature drop, heating by the main heater 75 and heating by the auxiliary heater 77 are performed alternately, giving priority to the former, through the same process as described above, so that the hot water area 73 and the heat storage area 75
The temperature becomes close to the predetermined temperature again. Although it is not shown in FIG. 5, a temperature sensor is installed in the hot water area 73, and when the temperature reaches a temperature suitable for hot water supply, a notification that the supply is possible is sent out, and when that temperature reaches a temperature suitable for hot water supply, a notification is sent out. If the temperature falls below the permissible limit, a warning will be issued to alert you. FIG. 6 is a sectional view of another conventional example. In the same figure, 3
1 is a tank, 32.32A are both partition walls, and the partition wall 32 on the - side divides the tank 31 into an upper hot area 33 and an immediately lower heat storage area 34B, and has one communication hole 3.
2a, and the other partition wall 32A has heat storage areas 34A, 3
4B, and has a gap 32Ao between it and the inner peripheral surface of the tank 31, in other words, a plurality of continuous communication holes. The hot area 33 includes a main heater 35 and a thermostat 36.
and a water level detector 9 are installed. In the heat storage area 34A,
An auxiliary heater 37 and a thermostat 38 are installed,
Nothing is installed in the heat storage area 34B. Note that the thermostat 38 can be installed in the heat storage area 34B, but because of convection, the average temperature of both will be higher if it is installed in the heat storage area 34A. A replenishing cold water pipe 31a provided with a solenoid valve 31A opens at the upper side of the tank 31 and connects to the upper opening of the cold water conduit 39, and the lower opening of the cold water conduit 39 is located at the bottom of the heat storage area 34A. Supply hot water piping 31 equipped with a solenoid valve 31B
b is installed so that hot water can be taken out from the lower side of the warm water area 33. The operation of this other conventional example is roughly as follows. Top heated area 33 and adjacent heat storage area 34
Since there is only one communication hole 32a in the partition wall 32 that separates the heat storage area 34B from the hot water area 33, no convection occurs between the hot water area 33 and the heat storage area 34B. Therefore, the temperature of each fence hardly influences each other due to convection. Each heat storage area 34A
, 34B has a gap 32A on its outer periphery.
o (corresponding to a plurality of communication holes), convection occurs between each heat storage area 34A, 34B, and the set temperature of the heat storage area 34A is higher than the set temperature of the hot water area 33, and furthermore, each heat storage area 34A, The temperature of the upper heat storage area 34B is slightly higher due to convection. Moreover, hot water is supplied first from the hot water area 33, then from each of the adjacent lower heat storage areas 34A,
34B, when cold water is supplied to the lowest heat storage area 34A in response to hot water supply, even if a large amount of hot water is supplied at - times, the rate of decrease in hot water temperature will be the same as in the conventional example. It can be suppressed more. Still another conventional example will be described with reference to FIG. 7, which is a sectional view thereof. In FIG. 7, another conventional example differs from the other conventional example described above in that three heat storage areas are arranged in a layered manner below the hot water area, and two partition walls are provided to separate each heat storage load. It is. That is, each heat storage area 3
4X, 34Y, 34Z are arranged adjacent to each other in order from the bottom,
Each load is divided by each partition wall 32X, 32Y. A gap is provided between the outer periphery of each of the partition walls 32X, 32Y and the inner surface of the tank 3I. Further, the auxiliary heater 37 and the thermostat 38 are installed in the lowest heat storage area 34X. In addition, the thermostat 38 has each heat storage area 34X, 3
It can be installed in either 4Y or 34Z, and the lower it is installed in the heat storage area, the higher the average temperature of the heat storage area will be due to convection. The set temperature of the heat storage area 34X is higher than the set temperature of the hot water area 33, and the temperature of each of the heat storage areas 34X, 34Y, and 34Z increases as it goes higher due to convection. Moreover, the supply of hot water is first started from the hot water area 33, and then supplied to the adjacent lower heat storage areas 34Z, 34Y, and 34χ in this order. Therefore, the temperature reduction rate of the hot water is lower than in the other conventional example, and the amount of hot water that can be supplied during the period of - is further increased.

[Question H that the invention attempts to solve]

In the conventional technology as explained above, when hot water is supplied, the temperature of the hot water area to which hot water is to be supplied decreases relatively quickly, although there are differences in degree, due to the accompanying replenishment of cold water. , that is, the temporal temperature decrease rate in warm areas is still large. This means, in other words, that sometimes a large amount of hot water cannot be supplied sufficiently. The object of this invention is to solve the problems of the conventional technology and suppress the rate of temperature drop in the upper water area due to cold water replenishment, without increasing the heater capacity or tank volume. An object of the present invention is to provide a hot water supply device that can supply hot water at a predetermined temperature.

[Means to solve the problem]

In order to solve this problem, the hot water supply device according to the present invention supplies hot water at a predetermined temperature in the tank to the outside based on a command, and also has an upper end part so that the water level in the tank is constant. In a device in which cold water is supplied from the upper end of a conduit, the conduit opens into a space in contact with the hot water in the tank and the lower end opens at the bottom of the hot water in the tank, the conduit has a large-diameter cylindrical shape at its upper end. Either an inflow device is provided, or a large diameter cylindrical outflow device is provided at the lower end thereof.

[Effect]

By installing the inflow device at the upper end of the conduit, air bubbles generated when cold water collides with the surface of hot water during cold water replenishment are less likely to enter the conduit, and the amount of air bubbles that enter the conduit is reduced. When these air bubbles flow out from the lower end of the conduit, they have a stirring effect on the cold water and hot water at that point, so reducing the air bubbles in the air leads to suppression of the stirring effect. Further, by installing the draining device at the lower end of the conduit, the flow rate of supplementary cold water to the tank bottom is reduced, and the stirring action of the cold water and hot water below the tank bottom is suppressed. As a result, by suppressing this stirring action,
The rate at which the temperature of the hot water to be supplied decreases due to the supplementary cold water is reduced.

【Example】

An embodiment of the hot water supply device according to the present invention will be described below with reference to a side view of a cold water conduit, which is a main component thereof. FIG. 1 is a side view of the first embodiment. The first embodiment differs from the conventional example in the structure of the cold water conduit. Note that the same applies to other conventional examples and still other conventional examples, so one conventional example will be described below as a representative example. The cold water conduit in the first embodiment consists of a conduit main body 1 and an outflow device 2 attached to its lower end. The outflow device 2 is a cylindrical member having a larger diameter than the conduit main body 1, and is fixed to the rightwardly bent lower end of the conduit main body 1 with its axial direction substantially aligned. Note that other members that are the same as those in the conventional example are designated by the same reference numerals, and explanations thereof will be omitted. By installing this outflow tool 2, the outflow speed of the supplementary cold water to the heat storage area 74 is reduced, and the stirring action of the cold water and hot water in the heat storage area 74 is suppressed. As a result, the rate of temperature decrease in the hot water area 73 is reduced, and a larger amount of hot water at a predetermined temperature can be supplied from the hot water area 73 at one time. FIG. 2 is a side view of a cold water conduit (hereinafter referred to as a second cold water conduit) in the second embodiment. In FIG. 2, the second cold water conduit has the same conduit body 1 as in the first embodiment,
It consists of a draining tool 3 attached to its lower end. This outflow tool 3 has outflow holes 4 in the side wall of the outflow tool 2 in the first embodiment.
There are multiple holes. The plurality of outflow holes 4 increase the substantial outflow cross-sectional area of the outflow tool 3. As a result, the outflow speed of the supplementary cold water to the heat storage area 74 (see FIG. 1) is further reduced, and the stirring action of the cold water and hot water in the heat storage area 74 is further suppressed. FIG. 3 is a side view of a cold water conduit (hereinafter referred to as a third cold water conduit) in the third embodiment. In FIG. 3, the third cold water conduit consists of a conduit main body 5 and an inlet fitting 6 attached to its upper end. Note that the only difference is that the conduit main body 5 is slightly shorter in length than the conduit main body 1. The inflow device 6 is a cylindrical member having a diameter larger than that of the conduit main body 5 and a predetermined depth, and is fixed in such a manner that its axial directions are substantially aligned. Due to the installation of the inflow device 6, air bubbles generated when the cold water collides with the free surface of the warm water area 73 (see Figure 1) when replenishing cold water are caused by the fact that there is a certain distance between the free surface and the upper end of the conduit main body 5. , the amount that gets mixed into the inside of the conduit main body 5 is reduced. When these air bubbles flow out from the lower end of the conduit main body 5, they have a stirring effect on the cold water and the hot water in the heat storage area 74, so a reduction in the air bubbles leads to suppression of the stirring effect. As a result, by suppressing the stirring action, the rate of temperature drop in the warm water area 73 due to the supplementary cold water is reduced, and as a result, a larger amount of hot water at a predetermined temperature can be supplied from the hot water area 75 at one time. FIG. 4 is a side view of the cold water conduit (hereinafter referred to as the fourth cold water conduit) in the fourth embodiment. In FIG. 4, the fourth cold water conduit consists of a conduit main body 5 and an inlet fitting 8 attached to its upper end. The inflow device 8 is a cylindrical member having a diameter larger than that of the conduit main body 5 and a predetermined depth, and is fixed in such a manner that its axes are offset from each other. Due to the installation of the inflow device 8, the air bubbles generated when the cold water collides with the free surface of the hot water area 73 during cold water replenishment are caused by the fact that the distance between the free surface and the upper end of the conduit main body 5 is the same as in the third embodiment. However, since the respective axial directions are shifted, the amount that gets mixed into the inside of the conduit main body 5 is further reduced. As a result, the effects of the fourth embodiment are even greater than those of the third embodiment. By the way, as a matter of course, the first embodiment or the second embodiment,
It is even more effective if the third embodiment or the fourth embodiment is combined.

【Effect of the invention】

In this invention, by installing an inflow device at the upper end of the conduit, air bubbles generated when cold water collides with the surface of hot water during cold water replenishment are difficult to enter the conduit, and by installing an outflow device at the lower end of the conduit. As a result, the speed at which make-up cold water flows to the bottom of the tank decreases, and in any case, the stirring action between cold water and hot water at the bottom of the tank is suppressed, and the rate at which the temperature of hot water to be supplied by make-up cold water decreases is reduced. eased. Therefore, without increasing the heater capacity or tank capacity, -
It has the excellent effect of being able to supply a large amount of hot water at a predetermined temperature to the outside.

[Brief Description of the Drawings] Fig. 1 is a side view of the first embodiment according to the present invention, Fig. 2 is a side view of the cold water pipe in the second embodiment, and Fig. 3 is a side view of the cold water pipe in the third embodiment. 4 is a side view of the cold water conduit in the fourth embodiment, FIG. 5 is a sectional view of one conventional example, FIG. 6 is a sectional view of another conventional example, and FIG. 7 is yet another conventional example. FIG. Symbol explanation 15: conduit main body, 2.3: outflow tool, 4: outflow hole, 6.8 2 inflow tool. The ice block number 1

Claims (1)

[Claims] 1) Hot water at a predetermined temperature in the tank is supplied to the outside based on a command, and the upper end opens into a space in contact with the hot water in the tank, and the lower end In a device in which cold water is supplied from the upper end of a conduit that opens to the bottom of the hot water in the tank, the conduit is provided with a large-diameter cylindrical inlet at its upper end, or a large-diameter cylindrical inlet at its lower end. 1. A hot water supply device comprising at least one of the following.