JPH04233609A - Hot and cold mixer - Google Patents

Abstract

PURPOSE:To obtain a satisfactory hot water supplying characteristic by preventing a hot water supplying device connected to the hot water supply side of the hot and cold water mixer from coming down to less than minimum operating flow or to the minimum scale. CONSTITUTION:According to a set temperature Ts, inside water temperature Tc and inside hot water temperature Th, a set flow calculation part 18 converts bottom operating flow MOQ of a hot water supplying device 2 to set flow QS1 according to the set flow QS1=MOQ(Th-Tc)/(Ts-Tc). At a set flow calculation part 19, a minimum size Wmin of the hot water supplying device 2 is converted to set flow QS2 according to the set flow QS=25XWmin/(Ts-Tc). A flow control part 20 controls the quantity of hot water to be poured by considering the maximum flow, among the converted set flow QS1 and QS2 and flow QS3 set by a setter 21, max(QS1, QS2 and QS3) as the objective set flow.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water mixing device used, for example, as an electronic cooker.

0002

[Prior Art] In a water heater, the passing flow rate is monitored, and when this flow rate falls below a certain value (minimum operating flow rate MOQ), the combustion of the gas burner in the water heater is forcibly stopped, resulting in unstable combustion. Preventing the condition.

[0003] For this reason, when the hot water supply side of a hot water mixing device such as an electronic cooker is connected to a water heater, if the set flow rate of the hot water mixing device is low, the flow rate passing through the water heater may exceed or fall below the minimum operating flow rate. This caused the water heater (gas burner) to repeatedly ignite and extinguish the fire. Also,
Even if the set flow rate of the hot water mixing device is high, if the set temperature is low and the heating capacity of the water heater is less than the minimum number, the flow rate on the hot water side will be throttled by the mixing valve, etc., and the flow rate passing through the water heater will decrease. However, when the flow rate decreased to around the minimum operating flow rate, the water heater would repeatedly ignite and extinguish. As a result, there was a problem in that the hot water output characteristics of the hot water mixing device deteriorated.

[0004] Furthermore, in the hot water mixing device disclosed in JP-A-1-208625, the minimum flow rate (different from the minimum operating flow rate MOQ) is determined according to the type of water heater and the set temperature, and compared with the set flow rate. The amount of hot water is controlled using the larger flow rate.

[0005] However, even in such a hot water mixing device, an appropriate minimum flow rate is determined based only on the set temperature, so if the inlet water temperature is high, the water heater will fall below the minimum number, There was a problem that the hot water temperature fluctuated due to the water heater igniting and extinguishing the fire.

[0006]

[Problems to be Solved by the Invention] The present invention has been made in view of the drawbacks of the conventional examples described above, and its purpose is to prevent the water heater from falling below the minimum operating flow rate or minimum number of water heaters. An object of the present invention is to provide a hot water mixing device that can control the temperature and flow rate of hot water.

[0007]

[Means for Solving the Problems] The hot water mixing device of the present invention includes a hot water supply section that supplies hot water heated by a water heater, and a hot water supply section that supplies hot water and water supplied from the water supply section. A hot water mixing section for mixing, means for setting the flow rate of hot water dispensed from the hot water mixing section, a hot water temperature setting device for inputting a set temperature of hot water dispensed from the hot water mixing section, and water entering from the water supply section. An incoming water temperature detector detects the temperature, an incoming water temperature detector detects the incoming water temperature from the hot water supply section, and a set flow rate is converted from the minimum operating flow rate of the water heater based on the incoming water temperature, incoming water temperature, and set temperature. a set flow rate calculation means, a set flow rate calculation means for converting a set flow rate from the minimum number of water heaters based on the water input temperature and the set temperature, a set flow rate converted from the minimum operating flow rate of the water heater, and a set flow rate calculated from the minimum operating flow rate of the water heater; The present invention is characterized by comprising means for controlling the amount of hot water output from the hot water mixing section by using the largest flow rate among the set flow rate converted from the minimum number and the flow rate set by the flow rate setting means as the set flow rate for control.

[0008]

[Operation] In the present invention, the highest flow rate among the set flow rate converted from the minimum operating flow rate of the water heater, the set flow rate converted from the minimum size number of the water heater, and the set flow rate by the flow rate setting means. Since the amount of hot water coming out of the hot water mixing section is controlled using the set flow rate for control, the flow rate on the hot water side is kept above the minimum operating flow rate of the water heater, and the hot water temperature and combustion capacity of the water heater are kept above the minimum number. It is maintained. Therefore, if the water heater that supplies hot water to the hot water supply section drops below the minimum operating flow rate or below the minimum number, the water heater will repeatedly ignite and extinguish the fire, causing the hot water temperature to fluctuate unstablely. This can be prevented and the hot water discharge characteristics of the hot water mixing device can be improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of the present invention. Reference numeral 1 indicates an electronic cooker, and 2 indicates a water heater. The electronic cooker 1 has a hot water supply side connected to the water heater 2, and a water supply side connected to city water or the like. In the electronic cooker 1, a water supply path 3 and a hot water supply path 4 are connected to a mixing valve 5, and the mixed hot water mixed in the mixing valve 5 is discharged from a hot water mixing path 6. The water supply path 3 includes an inlet water temperature detector 7 such as a thermistor for detecting the inlet water temperature Tc.
A hot water supply path 4 is provided with a hot water temperature detector 8 for detecting the hot water temperature Th. The hot water mixing path 6 has a temperature Tm of hot water discharged from the mixing valve 5.
A hot water outlet temperature detector 9 and a flow rate detector 10 for detecting the flow rate Q are disposed, and a flow rate adjustment water stop valve 11 for adjusting the flow rate Q of the hot water mixing path 6 is provided.

FIG. 2 shows a sectional view of a specific structure of the electronic callan 1. As shown in FIG. A water supply passage 3 and a hot water supply passage 4 are provided in the upper part of the casing 12.
A balancer 13 is provided at the center of the tank to reduce changes in hot water inflow ratio due to fluctuations in hot water pressure or water pressure. Further, after passing through the balancer 13, the hot water supply path 4 and the water supply path 3 are provided with a hot water temperature detector (hot water thermistor) 8 and a hot water temperature detector (water inlet temperature detector) for detecting the hot water temperature Th and the hot water temperature Tc, respectively. A thermistor 7 is provided. The hot water supply path 4 and the water supply path 3 join together in the hot water mixing chamber 14, and hot water and water are mixed in the hot water mixing chamber 14. This hot water mixing chamber 1
A mixing valve 5 is housed in the water heater 4, and by driving the mixing valve 5 with a stepping motor 15, the mixing ratio of hot water and water can be adjusted and the mixed water temperature Tm can be adjusted. Furthermore, a hot water mixing path 6 is formed after passing through the hot water mixing chamber 14, and the hot water mixing path 6 is equipped with a hot water temperature detector (a hot water tap thermistor) 9 for detecting the mixed hot water temperature Tm, and a hot water tap flow rate Q. A flow rate detector (flow rate sensor) 10 is provided to detect the flow rate. Further, the hot water mixing path 6 is provided with a flow rate adjustment water stop valve 11 for adjusting the amount of hot water dispensed.

The temperature Tm of hot water discharged from the hot water mixing path 6 is shown in FIG.
As shown in FIG. 2, it is controlled by a hot water temperature control section 16, and the hot water temperature control section 16 includes a hot water temperature setting device 17 for inputting a set value Ts of the outlet temperature Tm. Further, the hot water temperature control section 16 receives a detection signal indicating the hot water temperature Th from the hot water temperature detector 8 , and outputs a control signal from the hot water temperature control section 16 to the mixing valve 5 . Therefore, when the set temperature Ts is input from the hot water temperature setting device 17, the hot water temperature control section 1
6 drives the mixing valve 5, and the mixing ratio of hot water and water is adjusted by the mixing valve 5 so that hot water having a tapping temperature Tm equal to the set temperature Ts is dispensed. Furthermore, the hot water temperature control unit 16 monitors the hot water temperature Th using the hot water temperature detector 8 and performs feedback control on the mixing valve 5 so that hot water at a set temperature Ts is dispensed.

As shown in FIG. 1, the flow rate of hot water discharged from the hot water mixing path 6 is controlled by two set flow rate calculation sections 18, 19 and a flow rate control section 20, and the flow rate control section 20 controls the setting of the hot water flow rate Q. Flow rate setting device 2 for inputting value QS3
1. The set flow rate calculation unit 18 functions to convert the minimum operating flow rate MOQ of the water heater 2 into the set flow rate of the electronic calunter 1, and receives input from the hot water temperature setting device 17, the inlet water temperature detector 7, and the inlet water temperature detector 8. The minimum operating flow rate MOQ of the water heater 2, which has been input and set in advance, is determined from the set temperature Ts, incoming water temperature Tc, and incoming water temperature Th.
) is converted to the set flow rate QS1. This converted set flow rate QS1 is such that when the set temperature, hot water input temperature, and input water temperature are Ts, Th, and Tc, respectively, the flow rate Q is the converted set flow rate QS1.
The following values are boundary values where the water heater 2 becomes less than or equal to the minimum operating flow rate MOQ.

Further, the set flow rate calculation section 19 functions to convert the minimum number Wmin of the water heater 2 into the set flow rate of the electronic cooker 1, and calculates the setting input from the hot water temperature setting device 17 and the incoming water temperature detector 7. Based on the temperature Ts and the inlet water temperature Tc, the minimum number Wmin of the water heater 2, which is input and set in advance, is converted into a set flow rate QS2 according to the set flow rate QS2 = 25 x Wmin/(Ts - Tc). This converted set flow rate QS2 is a boundary value that becomes below the minimum number Wmin in the water heater 2 when the flow rate Q becomes a value below the converted set flow rate QS2 when the set temperature and inlet water temperature are Ts and Tc. Note that the number is a unit representing the capacity of the water heater 2, and the number 1 refers to the ability to raise the temperature of 1 liter of water by 25° C. in 1 minute. Converted set flow rate QS1 from set flow rate calculation units 18 and 19,
The set flow rate QS3 from QS2 and the flow rate setter 21 is input to the flow rate control unit 20, and the flow rate control unit 20 selects the maximum set flow rate max among the three set flow rates QS1, QS2, and QS3.
(QS1, QS2, QS3) is regarded as the target set flow rate and the amount of hot water is controlled. That is, while monitoring the hot water flow rate Q with the flow rate detector 10, the hot water flow rate Q is max(Q
S1, QS2, QS3) Flow rate adjustment water stop valve 11
It outputs a control signal to adjust the amount of hot water Q.

When the set flow rate QS3 is larger than the converted set flow rates QS1 and QS2, the hot water output amount Q is controlled to be equal to the set flow rate QS3, and the flow rate setter 2
1 allows the hot water output amount Q to be controlled. On the other hand, if the set flow rate QS3 is either the converted set temperature QS1,
When it becomes smaller than QS2, the hot water output amount Q is controlled by both converted set flow rates QS1 and QS2, and the water heater 2 is prevented from becoming less than the minimum operating flow rate MOQ or less than the minimum number Wmin. , stable hot water supply is provided.

[0015] In the above embodiment, the values of the minimum operating flow rate and the minimum number of water heaters are fixed values, but these values may be set at the time of installing the hot water mixing device.
Alternatively, the settings may be automatically set through communication with the water heater when connecting to the water heater.

[0016]

[Effects of the Invention] According to the present invention, the flow rate passing through the water heater can be maintained at the minimum operating flow rate or higher, and the number of operating numbers of the water heater can also be maintained at the minimum number or higher, and the water heater can be repeatedly ignited and extinguished. This prevents the hot water temperature from fluctuating unstablely.
The hot water discharge characteristics of the hot water mixing device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of the present invention.

FIG. 2 is a detailed sectional view of the electronic callan same as above.

[Explanation of symbols]

2　Water heater 3 Water supply channel 4 Hot water supply path 5 Mixing valve 6　Hot water mixing path 7 Inlet water temperature detector 8　Bath water temperature detector 11 Flow rate adjustment water stop valve 17 Water temperature setting device 18, 19 Set flow rate calculation section 20 Flow rate control section 21 Flow rate setting device

Claims (1)

[Claims] Claim 1: A hot water supply section that supplies hot water heated by a water heater, a hot water mixing section that mixes hot water supplied from the hot water supply section and water supplied from the water supply section, and a hot water outlet from the hot water mixing section. a hot water temperature setting device for inputting the set temperature of the hot water dispensed from the hot water mixing section; an incoming water temperature detector for detecting the temperature of the incoming water from the water supply section; a hot water temperature detector that detects the hot water temperature from the water heater, a set flow rate calculation means that converts the minimum operating flow rate of the water heater to a set flow rate based on the water heater temperature, the hot water temperature, and the set temperature; a set flow rate calculation means for converting the minimum number of water heaters into a set flow rate based on temperature; a set flow rate converted from the minimum operating flow rate of the water heater; a set flow rate converted from the minimum number of water heaters; A hot water mixing device comprising means for controlling the amount of hot water output from a hot water mixing section by using the largest flow rate among the flow rates set by the flow rate setting means as a set flow rate for control.