JPH06288560A - Hot water heating system - Google Patents

Abstract

PURPOSE:To surely judge the completion of water feeding in a hot water heater by a method wherein whether or not water feeding is completed is judged according to an estimated drop in temperature, the detected value of a temperature detector after heating of a heat exchanger is stopped and then a heating medium supply valve is shut, and the open/shut state of a water supply device. CONSTITUTION:A pump 4 is started and a water supply device 10 is opened to feed water into a tank 3, and a burner 12 starts combustion after the detected value of a high-temperature sensor 6 is stored. When the detected value of the high-temperature sensor 6 reaches the heating set point within a specified time period, the burner 12 stops burning and the detected value of the high- temperature sensor 6 after a specified time period has passed is stored. When the detected value of the high-temperature sensor 6 drops below the heating set point within a specified time period, and the tank 3 is not under water feeding, a timer 19 starts counting, and it is judged whether a state in which the tank 3 is not under water feeding lasts for a specified time period. When such state lasts for the specified time period, it is assumed that pipes and the tank 3 have been fed with water, and the pump 4 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heater.

[0002]

2. Description of the Related Art Conventionally, the applicant of the present application has previously filed Japanese Patent Application No. 4-316506 as a method of filling water in a tank and a circulation path of a hot water heater. In this application, the tank is filled with water without heating the heat exchanger, and the heat medium supply valve after heating of the heat exchanger is stopped by the detection value of the temperature sensor provided in the circulation path is closed. Estimate the rate of temperature decrease detected by the temperature sensor at the time, after the temperature decrease rate is estimated, heat the heat exchanger, detect the temperature sensor after heating the heat exchanger and opening the heat medium supply valve Based on the above-mentioned temperature decrease rate, it was determined whether or not the water filling to the tank and the circulation route of the hot water heating device was completed.

[0003]

However, in the above-mentioned conventional example, it is determined whether or not the water filling in the hot water heating apparatus is completed based on the detected value of the temperature sensor and the estimated temperature decrease rate. If the water level in the tank is detected and the water supply means is opened, the circulating hot water temperature drops more than the temperature drop rate estimated by the tap water injected into the tank, and the water filling inside the hot water heater It was erroneously judged that it was finished even though was not finished.

Therefore, in the present invention, as an application example of the above conventional example, hot water heating is performed even when tap water is replenished by the water supply means while determining whether or not the water filling in the hot water heating apparatus is completed. An object of the present invention is to provide a hot water heating system capable of accurately determining whether or not the water filling in the device has been completed.

[0005]

In order to solve the above problems, in the present invention, a circulation path for circulating hot water for heating, a heat exchanger for heating hot water for heating in the circulation path, and a heat exchanger Temperature detection means for detecting the temperature of hot water heated by the exchanger, pump for circulating hot water, tank equipped with water supply means, heating load, and heating water supply to the heating load by opening And a heat medium supply valve, and a hot water heating device provided with a bypass passage that bypasses the circulation path, wherein the water is filled in the tank by the water supply means and the pump is turned on to fill the inside of the hot water heating device. The temperature decrease rate detected by the temperature detection means when the heat medium supply valve is closed after the heat exchanger heating is stopped is estimated from the detection value of the temperature detection means, and the heat exchanger is heated after the temperature reduction rate is estimated. , Heat exchanger After the heat is stopped, it is determined whether the water filling into the hot water heating device is completed by the detection value of the temperature detecting means after opening the heat medium supply valve, the temperature decrease rate, and the open / closed state of the water supply means. It is characterized in that a judging means is provided.

[0006]

In the present invention, the estimated temperature decrease rate, the detected value of the temperature detecting means after the heat medium supply valve is opened after the heating of the heat exchanger is stopped, and the opening and closing of the water supply means for supplying water into the tank. Since it is determined whether or not the water filling inside the hot water heating apparatus is completed depending on the state, it is possible to determine whether or not the water filling inside the hot water heating apparatus is completed more accurately than in the conventional example.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a block diagram showing the structure of a hot water heating apparatus according to the present invention. Reference numeral 1 denotes a hot water heating device, which has a circulation path 2 arranged therein and is connected to a heating radiator 16 described later. From the upstream side in the circulation path 2, a tank 3 for storing circulating hot water, a pump 4 for feeding the hot water, a heat exchanger 5 for heating the hot water, and a temperature of the hot water heated by the heat exchanger 5 are detected. The high temperature sensor 6 is arranged in order.

The tank 3 has an ON-OFF type low water level sensor 7 which is turned on when a predetermined low water level or higher in the tank is detected, and a predetermined medium water level or higher which is higher than the low water level. An ON-OFF type medium water level sensor 8 that is turned on and an ON-OFF type high water level sensor 9 that is turned on when a predetermined high water level higher than the medium water level is detected are arranged, and the water supply means 10 is opened. By this, tap water can be poured into the tank 3. An overflow port 11 is provided in the tank 4.

The heat exchanger 5 is heated by the burner 12, opens the on-off valve 13, and changes the opening of the proportional valve 14 to obtain the required gas amount.

Reference numeral 15 is a high temperature sensor 6 in the circulation path 2.
It is a bypass path that branches off at the start point at point A on the further downstream side and is connected at the end at point B on the upstream side of tank 3 in circulation path 2.

Reference numeral 16 denotes a heating radiator such as a panel heater, which allows heating hot water heated by opening the heat medium supply valve 17 to circulate in the heating radiator 5.

Reference numeral 18 denotes a controller for controlling the controlled devices such as the proportional valve and the pump described above. Inside the controller 18, a timer 19 having a time counting function, an arithmetic unit 20 for performing arithmetic processing, and sensor detection. A storage unit 21 that stores values and calculated values, and a determination unit 22 that determines whether or not water injection into the hot water heating device is completed are provided.

Reference numeral 23 is a remote controller connected to the controller 18, 24 is a trial operation switch for performing a water injection operation in the hot water heating apparatus 1, and 25 is an operation switch that enables heating operation by being turned on. Yes, 26
Is a display unit that displays the operation status of the equipment, the location of equipment failure, and the like.

FIG. 2 is a sequence diagram showing the contents of control of the present invention. When the trial run switch 24 is turned on (S
1) The water injection operation into the hot water heater 1 is started, the pump 4 is turned on, and the water supply means 10 is opened (S2). In step 3, it is detected whether the high water level sensor 9 in the tank 3 is 0N, and if the high water level sensor 9 is ON, the water supply means 10 is closed (S4).

The relationship between the water level in the tank and the open / closed state of the water supply means will be described with reference to FIG. 1 is a predetermined low water level in the tank 3, m is a predetermined medium water level in the tank 3, and h is a predetermined high water level in the tank 3. By opening the water supply means 10, the water level in the tank begins to rise,
When the water level in the tank 3 reaches or exceeds the predetermined high water level h, the water supply means is closed. Even after detecting a predetermined high water level h or higher, the water level detection in the tank is continued by the three kinds of water level sensors provided in the tank, and when the water level becomes a predetermined medium water level m or lower, the water supply means 10 is opened and water is poured into the tank 3. To do.

In step 5, the detected value T0 of the high temperature sensor 6 is stored. In step 6, the burner 12 is burned, and in step 7, it is determined whether or not the time t from the start of burning the burner 12 has passed a predetermined time t01. In step 8, the high temperature sensor 6 It is determined whether the detected value TH is equal to or higher than the heating set temperature Ta. Heating set temperature T within a predetermined time t01
If it does not become a, it is considered that an abnormality of the combustion system has occurred, the pump 4 is turned off, the on-off valve 13 is closed, the combustion of the burner is stopped, and the abnormality of the combustion system is displayed on the display unit 26, and the process ends ( S29).

If the heating set temperature Ta is reached within the predetermined time t01, the combustion of the burner 12 is stopped (S9). In step 10, the time t after the combustion of the burner 12 is stopped
Is determined to be equal to or longer than the predetermined time t02,
The detection value Tb of the high temperature sensor 6 after the elapse of the predetermined time t02 is stored (S11). That is, since the temperature in the piping of the circulation path is not uniform when the burner combustion is stopped, the detected value of the high temperature sensor after a lapse of a predetermined time is stored.

FIG. 3 is a diagram showing the relationship between the detected value TH of the high temperature sensor 6 and the time t after a lapse of a certain time t02 after the combustion of the burner 12 is stopped in step 9. That is, in step 9, if the burner 12 combustion is stopped, the pump operation is continued, and the heat medium supply valve 17 is closed, the heating circulating hot water is forcedly circulated in the portion shown by the dotted arrow in FIG. The temperature decrease rate of the detected temperature detected by the high temperature sensor 6 is constant and can be expressed as a straight line X or a straight line Y in FIG. In short, if the atmosphere temperature in the hot water heating device 1 is high, the temperature decrease rate is small and is represented as a straight line X, but if the atmosphere temperature is low, the temperature decrease rate is large and is represented as a straight line Y. The applicant has confirmed through experiments, and the temperature decrease rate can be estimated by the ambient temperature.
The ambient temperature in the hot water heater 1 can be estimated by the detection value T0 of the high temperature sensor 6 before the burner 12 is burned.

FIG. 4 shows the detected value TH of the high temperature sensor 6,
It is the figure which showed the relationship with the time t after the fixed time t02 progress after combustion of the burner 12 stopped. In step 5, the detected value of the high temperature sensor 6 when the burner 12 is not combusted is stored in the storage unit 21. Based on the stored detected value, the dotted arrow in FIG. The straight line Z represents the temperature decrease rate when the heating circulating hot water is circulated in the route indicated by the above, and the calculation unit 20 estimates and calculates the temperature decrease rate. That is, in the straight line Z, the detected value of the high temperature sensor 6 after the burner 12 has stopped burning and a certain time t02 has elapsed is Tb, and the detected value of the high temperature sensor 6 after the time t1 has elapsed is (Tb-T1), The detection value of the high temperature sensor 6 after the lapse of time t2 is (Tb-T2), and the detection value of the high temperature sensor 6 after the lapse of time t3 is (Tb-T).
3). However, the magnitude relation of the above symbols is t1 <t
2 <t3 and T1 <T2 <T3.

The straight line W in FIG. 4 shows the relationship between the detected value of the high temperature sensor 6 and the time when the heat medium supply valve 17 is opened while the pump 4 is operating after a lapse of a certain time t02 after the combustion of the burner 12 is stopped. The temperature decrease rate becomes large as compared with the straight line Z when the heat medium supply valve 17 is closed. This is because the heating circulating hot water radiated by the heating radiator 16 is mixed with the hot circulating water passing through the bypass passage 15 at the end point B of the bypass passage 15. Figure 3
Also, the sequence diagram after step 12 utilizes these things described in FIG.

In step 12, the heat medium supply valve 17
Is opened, and it is determined whether or not the time t after the heat medium supply valve 17 is opened is within a fixed time t1 (S13), and whether the detected value TH of the high temperature sensor 6 is less than the temperature (Tb-T1). (S14), the temperature (Tb-T
If less than 1), it is determined in step 15 whether or not the tank 3 is filled with supplemental water. Whether or not the tank 3 is replenished with water is determined by whether or not the water supply means 10 is open.

Within a predetermined time t1, the detected value TH of the high temperature sensor 6 becomes less than the temperature (Tb-T1), and the tank 3
If it is not in the replenishing water, the timer 19 is used to measure the elapsed time after it is determined in step 15 that it is not the replenishing water.
To start measurement (S16). The timer 19 has a plurality of time counting functions. In step 17, it is determined whether or not the state of not being supplemented with water in the tank 3 has continued for a predetermined time. If the state of not being supplemented with water in the tank 3 continues for a prescribed time, the pipes of the hot water heater 1 and the tank are Assuming that water filling has been performed, the pump 4 is turned off and the process ends (S18). Step 13 to Step 1
If it is not judged that the water filling is completed in the sequence up to 7,
The determination is performed according to the sequence from step 19.

In step 19, the heat medium supply valve 17
It is determined whether or not the time t from when the valve is opened is within a certain time t2, and the detected value TH of the high temperature sensor 6 is the temperature (Tb-T
It is determined whether it is less than 2) (S20), and if it is less than the temperature (Tb-T2) within a certain time t2, it is determined in step 21 whether the tank 3 is in the supplemental water. Whether or not the tank 3 is replenished with water is determined by whether or not the water supply means 10 is open.

Within a predetermined time t2, the detected value TH of the high temperature sensor 6 becomes less than the temperature (Tb-T2), and the tank 3
If it is not in the replenishing water, the timer 19 is used to measure the elapsed time after it is determined in step 21 that it is not the replenishing water.
To start measurement (S22). In step 23, it is determined whether or not the non-replenishment water in the tank 3 has continued for a predetermined time. If the non-replenishment water state in the tank 3 continues for a predetermined time, the pipes of the hot water heater 1 and the tank are determined. Assuming that water filling has been performed, the pump 4 is turned off and the process ends (S18). Step 19 to Step 2
If it is not judged that the water filling is completed in the sequence up to 3,
The determination is made according to the sequence from step 24 onward.

In step 24, the heat medium supply valve 17
It is determined whether or not the time t from when the valve is opened is within a fixed time t3, and the detected value TH of the high temperature sensor 6 is the temperature (Tb-T
It is determined whether it is less than 3) (S25), and if it is less than the temperature (Tb-T3) within a fixed time t3, it is determined in step 26 whether the tank 3 is in the replenishing water. Whether or not the tank 3 is replenished with water is determined by whether or not the water supply means 10 is open.

Within a predetermined time t3, the detected value TH of the high temperature sensor 6 becomes less than the temperature (Tb-T3), and the tank 3
If it is not in the replenishing water, the timer 19 is used to measure the elapsed time after it is determined in step 26 that it is not the replenishing water.
To start measurement (S27). In step 28, it is determined whether or not the non-replenishment water state in the tank 3 has continued for a predetermined time. If the non-replenishment water state in the tank 3 continues for a predetermined time, the pipes and the tank of the hot water heating device 1 are determined. Assuming that water filling has been performed, the pump 4 is turned off and the process ends (S18). Step 24 to Step 2
If it is not judged that the water filling is completed in the sequence up to 8,
The pump 4 is turned off, the failure of water filling is displayed on the display unit 26, and the process ends (S30).

FIG. 6 is a sequence diagram showing another embodiment of the present invention. The step numbers in FIG. 6 that are the same as those in FIG. 2 have the same contents, and a description thereof will be omitted.

In step 31, the timer 19 is started after confirming that the detected value of the high temperature sensor 6 is less than the temperature (Tb-T1) in step 14.
In step 32, it is determined whether or not a predetermined time has elapsed since the timer 19 was started in step 31, and if the predetermined time has elapsed, it is determined in step 33 whether or not the tank 3 is filled with supplemental water. Then, when the water supply in the tank 3 is completed, the pump 4 is turned off and the operation is completed (S1).
8).

In step 34, the timer 19 is started after confirming in step 20 that the detected value of the high temperature sensor 6 has become less than the temperature (Tb-T2).
In step 35, it is determined whether or not the time after starting the timer 19 in step 34 has passed a predetermined time, and if the predetermined time has passed, it is determined in step 33 whether or not the tank 3 is filled with supplemental water. Then, when the water supply in the tank 3 is completed, the pump 4 is turned off and the operation is completed (S1).
8).

In step 36, the timer 19 is started after confirming in step 25 that the detected value of the high temperature sensor 6 has become less than the temperature (Tb-T3).
In step 37, it is determined whether or not a predetermined time has elapsed since the timer 19 was started in step 36, and if the predetermined time has elapsed, then in step 33 it is determined whether or not the tank 3 is being refilled with water. Then, when the water supply in the tank 3 is completed, the pump 4 is turned off and the operation is completed (S1).
8).

In the embodiment of FIGS. 2 and 6, it is determined in step 14 whether the temperature is lower than the temperature (Tb-T1). However, the temperature considering the heat radiating action of the heating radiator 16 is taken into consideration. Tb− (T1 + α)} or less, and also in step 20, the heating radiator 16
Taking into account the heat dissipation effect of {Tb- (T2 + β)}
It may be judged whether it is less than or equal to, and similarly, step 2
Also in 5, the determination may be made based on whether or not the temperature is below the temperature {Tb− (T3 + γ)} in consideration of the heat radiation effect of the heating radiator 16.

[0032]

According to the present invention, whether or not the water filling of the tank and the piping of the hot water heating device is completed depends on the estimated temperature decrease rate, the actual temperature decrease rate, and the open / closed state of the water supply means provided in the tank. It can be determined more surely than the conventional example.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a hot water heating device.

FIG. 2 is a sequence diagram showing the contents of control of the present invention.

FIG. 3 is a diagram showing a relationship between a detection value of a high temperature sensor and time.

FIG. 4 is a diagram showing a relationship between a detected value of a high temperature sensor and time.

FIG. 5 is a diagram showing the relationship between the water level in the tank and the open / closed state of the water supply means.

FIG. 6 is a sequence diagram showing the content of control of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water heating system 2 Circulation path 3 Tank 4 Pump 5 Heat exchanger 6 High temperature sensor 10 Water supply means 15 Bypass path 16 Heating radiator 17 Heat medium supply valve 22 Judgment means

Claims (1)

[Claims] 1. A circulation path for circulating hot water for heating, a heat exchanger for heating the hot water for heating in the circulation path, and a temperature detection means for detecting the temperature of the hot water heated by the heat exchanger, A bypass for bypassing the circulation path, which is provided with a pump for circulating hot water, a tank provided with a water supply means, a heating load, and a heat medium supply valve capable of supplying hot water to the heating load by opening. A hot water heating device having a passage, wherein the water is supplied to the inside of the tank while the pump is turned on to fill the inside of the hot water heating device, and the heat medium after heating of the heat exchanger is stopped according to the detection value of the temperature detection device. Estimate the temperature decrease rate detected by the temperature detection means when the supply valve is closed, heat the heat exchanger after estimating the temperature decrease rate, and open the heat medium supply valve after stopping the heat exchanger Detection value of temperature detection means after And a determination means for determining whether or not the water filling into the hot water heating apparatus is completed based on the temperature decrease rate and the open / closed state of the water supply means.