JPH0421103B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot water supply control device, and provides a hot water/water mixing type hot water supply control that enables effective use of appliance heating capacity over the proportional control range and improves usability. Regarding equipment.

[Prior art]

In conventional hot water mixing type hot water supply control devices, a control method called high temperature fixed setting is adopted as a method of controlling the hot water outlet temperature on the hot water side before mixing hot water and cold water. (Refer to Japanese Utility Model Application Publication No. 58-120443) [Problems to be solved by the invention] However, with the above control method, it is not possible to sufficiently secure the heating capacity of the appliance.
When the user closes the stopcock, the water level drops below the specified minimum operating water level before the heating capacity of the appliance reaches its minimum.
It had the disadvantage that the entire heating capacity range could not be used.

That is, the heating capacity G, the hot water side outlet temperature T _H , the incoming water temperature T _C , the hot water side water volume Q _H , the mixed hot water outlet temperature T _M , and the hot water output amount
The relationship between Q _{and M} is as shown in equation (1) below.

G = (T _H − T _C )・Q _H = (T _M − T _C )・Q _M … (1) The above hot water output amount Q _M is equal to the sum of the hot water side water amount Q _H and the bypass water amount Q _C (Q _M = Q _H + Q _C ). When the amount of hot water Q _M is calculated from the above equation (1), it becomes Q _M = T _H - T _C /TM - TC·Q _H (2).

For example, in an appliance with a minimum heating capacity of size 3 or 0, the hot water outlet temperature T _H is set at 80°C, the set temperature T _S is 40°C, the water inlet temperature T _C is 15°C, and the hot water side water flow rate Q _H is operated by Pana. If the heating capacity is calculated from equation (1) with the minimum operating water flow rate of 2.0/min, it will be No. 5 or 2, and the minimum heating capacity cannot be used.

Also, the amount of hot water Q _M at this time is 5.2/ from equation (2).
min, but if the water volume is reduced to less than this, the water volume Q _H on the hot water side will fall below the minimum operating water volume, and combustion will stop.

The present invention has been made in consideration of the above-mentioned circumstances, and it is an object of the present invention to provide a hot water mixing control device for a water heater that is easy to use and can fully demonstrate hot water dispensing capacity regardless of the amount of hot water desired by the user. purpose.

[Means for solving problems]

A hot water supply control device according to the present invention includes a hot water supply circuit including a heating path passing through a heat exchanger and a bypass path parallel to the heat exchanger, a heating device that heats the heat exchanger, and a heating device that heats the heat exchanger. A capacity control device that controls the amount of heat generated, a temperature setting device, a hot water side temperature setting means, a control circuit unit that operates the capacity control device so that the temperature of hot water discharged from the heating path becomes the hot water side set temperature, and a hot water side water amount. Alternatively, a water amount detection means for detecting the amount of water entering is provided, and the hot water side temperature setting means sets the set hot water temperature.
It is characterized in that it is configured to increase or decrease based on the amount of water on the hot water side in response to an increase or decrease in the amount of water.

For example, the hot water side temperature setting of the hot water side temperature setting means is
For example, if the temperature is increased or decreased in direct proportion to the water flow on the hot water side, if the water flow decreases, the hot water outlet temperature on the hot water side will drop in proportion to it, and the minimum heating capacity for the minimum operating water flow will be lower than before. Can be made small,
The heating capacity range of the appliance can be effectively used over the proportional control range, making it easier to use.

Embodiment The drawing shows an embodiment of the present invention, in which reference numeral 1 denotes a hot water supply circuit comprising a heating path 3 passing through a heat exchanger 2 and a bypass path 4 parallel to the heat exchanger 2. 5 is a heating device such as a burner that heats the heat exchanger 2; 6 is a capacity control device such as a gas proportional valve that controls the amount of heat generated by the heating device 5; 7 is a water temperature detector provided on the water inlet side of the hot water supply circuit 1 to detect the temperature of the water supply;
is a hot water temperature detector installed on the hot water outlet side of the hot water supply circuit 1 to detect the mixed hot water temperature. A flow rate detector 9 detects the flow rate to the heat exchanger 2, and is arranged in the heating path 3. Reference numeral 10 denotes a water flow control valve that is provided in the bypass passage 4 and controls the flow of bypass water. 11 is a temperature setting device. 12 is a control circuit section, which includes a water temperature detector 7;
and a calorie control unit 13 that operates the capacity control device 6 based on the signals from the flow rate detector 9 and the hot water temperature setting device 15.
, a hot water side temperature setting means 15 that sets the hot water side set temperature as a function of the hot water side water amount, and a water flow control section 14 that operates the water flow control valve 10 based on signals from the temperature setting device 11 and the hot water temperature detector 8. Built-in.

The operation of the above configuration will be explained. The supplied water is divided into a heating path 3 and a bypass path 4. In the heating path 3, the water temperature detector 7 detects the incoming water temperature T _C and the flow rate detector 9 detects the flow rate Q _H , and sends a signal to the heat quantity control section 13. In the heat amount control section 13, the temperature setting device 11
The gas amount G to be combusted by the heating device 5 is calculated from these data along with the signal, and a signal is sent to the capacity control device 6 to cause the gas amount to flow. and heating path 3
The water flowing through is heated by heat exchanger 2, and the outlet temperature is set slightly higher than the set temperature T _S in anticipation of the cold water mixture.
T _H is made. After that, it is mixed with cold water, and the hot water temperature T _M after mixing is detected by the hot water temperature detector 8.
The water flow control unit 14 calculates the opening degree of the water flow control valve 10 so that T _M =T _S and operates the water flow control valve 10 .

The heat amount control unit 13 calculates the heating capacity G according to the above equation (1) and controls the gas proportional valve 6 to match the hot water outlet temperature T _H with the predetermined hot water side set temperature T _S ′. It works like this. The hot water side set temperature T _S ′ (=hot water outlet temperature T _H ) set by the hot water side temperature setting means 15 increases or decreases in direct proportion to the increase or decrease in the hot water side water amount Q _H , as shown in equation (3). be done.

T _S ′=K ₁ +K ₂・Q _H …(3) Here, K ₁ = 38, K ₂ = 7, the set water temperature is 40℃,
Assuming that the inlet water temperature is 15℃ and the minimum operating water flow is 2.0/min, finding Q _M (min) in equation (2) above is: Q _M (min) = (38 + 7 x 2.0) - 15 / 40 - 15 x 2.0 = 2.96/min, and the heating capacity is 3.0 from equation (1). In this way, the heating capacity of the appliance can be effectively used in the proportional control range of appliances having a hot water tap capacity range of 3.0 to 16.0, making it easier to use. Note that the functional relationship between the hot water side set temperature TS' set by the hot water side temperature setting means 15 and the hot water side water amount _GH is not limited to the above-mentioned direct proportional relationship, and can be changed in various ways.

〔Effect of the invention〕

As described above, according to the present invention, the hot water outlet temperature is increased or decreased in accordance with the predetermined functional relationship with the hot water amount, so that the user can mix the hot water with a tap to obtain the desired amount of hot water. Even if the amount of hot water is reduced, the heating capacity of the water heater can be used effectively over the entire proportional control range, and the range of hot water output can be expanded to the smaller flow rate side compared to conventional systems, making it easier to use.

[Brief explanation of drawings]

FIG. 1 is an overall circuit diagram of the present invention. FIG. 2 is a block circuit diagram of the control circuit section. 1...Hot water supply circuit, 2...Heat exchanger, 3...Heating path, 4...Bypass path, 5...Heating device, 6...
Capacity control device, 9...Flow rate detector, 10...Water flow control valve, 11...Temperature setting device, 12...Control circuit unit, 15...Hot water side temperature setting means.

Claims (1)

[Claims] 1. A hot water supply circuit configured with a heating path passing through a heat exchanger and a bypass path parallel to the heat exchanger, a heating device that heats the heat exchanger, and a capacity control device that controls the amount of heat generated by the heating device. , a flow rate detector that detects the amount of water in the heat exchanger, a temperature setting device, a control circuit unit that operates a capacity control device so that the temperature of the hot water discharged from the heating path becomes the set temperature on the hot water side, and A hot water supply control device characterized by comprising: hot water side temperature setting means that sets the temperature as a function of the amount of water in the heating path.