JP3144150B2 - Hot water heating system - Google Patents

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 Heretofore, as a method of filling a tank and a circulation path of a hot water heating apparatus with water, the present applicant has previously filed Japanese Patent Application No. 4-316506. In this application, the tank was filled with water by a water supply means without heating the heat exchanger, and the heat medium supply valve after the heat exchanger was stopped was closed by the detection value of the temperature sensor provided in the circulation path. Estimate the temperature decrease rate detected by the temperature sensor at the time, and after estimating the temperature decrease rate, heat the heat exchanger, stop the heating of the heat exchanger, and then open the heat medium supply valve and then detect the temperature sensor detection value Based on the above and the temperature decrease rate, it was determined whether or not the filling of the tank and the circulation path of the hot water heating device was completed.

[0003]

However, in the above conventional example, it is determined whether or not the water filling in the hot water heating apparatus has been completed based on the detected value of the temperature sensor and the estimated temperature decrease rate. When the water level in the tank is detected and the water supply means is opened, the temperature of the circulating hot water falls below the rate estimated by the tap water injected into the tank, and the water in the hot water heating system is filled. Was incorrectly determined to have ended despite having not ended.

Therefore, in the present invention, as an application example of the above-mentioned conventional example, even when tap water is supplied by the water supply means during the determination as to whether or not the water filling in the hot water heating apparatus has been completed, the hot water heating apparatus may be used. It is an object of the present invention to provide a hot water heating system capable of accurately determining whether or not water filling in a device has been completed.

[0005]

According to the present invention, in order to solve the above problems, a circulation path for circulating hot water for heating, a heat exchanger for heating hot water for heating in the circulation path, Temperature detection means for detecting the temperature of hot water heated by the exchanger, a pump for circulating hot water, a tank with water supply means, a heating load, and hot water supply to the heating load by opening A heating medium supply valve, and a hot water heating apparatus provided with a bypass that bypasses the circulation path, and turns on the pump while filling the tank with the water supply means to fill the hot water heating apparatus with water, Estimate the temperature decrease rate detected by the temperature detection means when the heat medium supply valve is closed after the heat exchanger stops heating based on the detection value of the temperature detection means, and heat the heat exchanger after estimating the temperature decrease rate. , Heat exchanger It is determined whether or not the water filling in the hot water heating apparatus has been completed based on the detection value of the temperature detecting means after opening the heat medium supply valve after the heat stop, the temperature decrease rate, and the open / close state of the water supply means. It is characterized in that judgment means is provided.

[0006]

According to the present invention, the temperature reduction rate estimated above, the value detected by the temperature detecting means after the heating 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 in the hot water heating apparatus has been completed based on the state, it is possible to more accurately determine whether or not the water filling in the hot water heating apparatus has been completed as compared with the conventional example.

[0007]

FIG. 1 is a configuration diagram showing the configuration of a hot water heating apparatus according to the present invention. Reference numeral 1 denotes a hot water heating device, in which a circulation path 2 is arranged, and connected to a heating radiator 16 described later. A tank 3 for storing circulating hot water, a pump 4 for supplying hot water, a heat exchanger 5 for heating hot water, and a temperature of the hot water heated by the heat exchanger 5 are detected from the upstream side in the circulation path 2. The high temperature sensors 6 are sequentially arranged.

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

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

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

Reference numeral 16 denotes a heating radiator such as a panel heater. The heating medium supply valve 17 is opened so that heated heating water can be circulated in the heating radiator 5.

Reference numeral 18 denotes a controller for controlling the above-described controlled devices such as the proportional valve and the pump. The controller 18 includes a timer 19 having a timekeeping function, an arithmetic unit 20 for performing arithmetic processing, and sensor detection. The storage unit 21 includes a storage unit 21 for storing values, calculated values, and the like, and a determination unit 22 that determines whether or not water injection into the hot water heating apparatus has been completed.

Reference numeral 23 denotes a remote controller connected to the controller 18, reference numeral 24 denotes a test operation switch for performing a water injection operation in the hot water heating apparatus 1, and reference numeral 25 denotes an operation switch which is turned on to enable heating operation. Yes, 26
Is a display unit for displaying an appliance operation state, an appliance failure location, and the like.

FIG. 2 is a sequence diagram showing the contents of the control of the present invention. When the test run switch 24 is turned ON (S
1) The operation of injecting water into the hot water heating apparatus 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 or not the high water level sensor 9 in the tank 3 is 0N. If the high water level sensor 9 is ON, the water supply means 10 is closed (S4).

Here, the relationship between the water level in the tank and the open / close state of the water supply means will be described with reference to FIG. l is a predetermined low water level in the tank 3, m is a predetermined middle 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 starts to rise,
When the water level in the tank 3 becomes equal to or higher than a predetermined high water level h, the water supply means is closed. After detecting the predetermined high water level h or more, the water level in the tank is continuously detected by the three types of water level sensors provided in the tank, and when the water level falls below the predetermined middle water level m, the water supply means 10 is opened and water is injected into the tank 3. I do.

In step 5, the detected value T0 of the high temperature sensor 6 is stored. In step 6, the burner 12 is burned. In step 7, it is determined whether or not the time t from the start of the burner 12 combustion has exceeded 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 predetermined time t01
If a does not occur, 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 to stop the burner combustion, and the display unit 26 displays the abnormality of the combustion system, and ends ( S29).

When 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 t.
Is determined to be equal to or longer than a predetermined time t02,
The detection value Tb of the high temperature sensor 6 after the lapse of the predetermined time t02 is stored (S11). That is, when the burner combustion is stopped, the temperature in the piping of the circulation path is not uniform, so that the detection value of the high temperature sensor after a predetermined time has elapsed 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 the lapse of a fixed time t02 after the burner 12 stops burning in step 9. In other words, if the burner 12 combustion is stopped in step 9 and the operation of the pump is continued and the heat medium supply valve 17 is closed, the forced circulation of the heating circulating hot water is performed at the portion indicated 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 represented as a straight line X or a straight line Y in FIG. In short, if the ambient temperature in the hot water heating apparatus 1 is high, the temperature decrease rate is small and is represented by a straight line X. However, if the ambient temperature is low, the temperature decrease rate is large and is represented by a straight line Y. The applicant has already confirmed by experiments, and the above-mentioned temperature decrease rate can be estimated from the ambient temperature.
Note that the ambient temperature in the hot water heating apparatus 1 can be estimated from the detection value T0 of the high temperature sensor 6 before the burner 12 burns.

FIG. 4 shows the detected value TH of the high temperature sensor 6 and
FIG. 7 is a diagram showing a relationship with a time t after a lapse of a fixed time t02 after the burner 12 stops burning. In step 5, the detection value of the high temperature sensor 6 when the burner 12 is not burning is stored in the storage unit 21. Based on the stored detection value, after the burner 12 stops burning, the dotted arrow in FIG. The temperature decrease rate when the heating circulating hot water is circulated through the path indicated by the symbol is calculated by the calculation unit 20, and the result is shown on a graph as a straight line Z. That is, on the straight line Z, the detection value of the high temperature sensor 6 when the burner 12 has stopped burning and the fixed time t02 has elapsed is Tb, and the detection 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-T2).
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 represents 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 operated after a lapse of a predetermined time t02 after the burner 12 stops burning. The rate of temperature decrease is larger than 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 high-temperature circulating water passing through the bypass passage 15 at a point B at the end of the bypass passage 15. FIG.
FIG. 4 is a sequence diagram after step 12 that utilizes these points.

In step 12, the heat medium supply valve 17
Is opened, and it is determined whether or not the time t from when the heat medium supply valve 17 is opened is within a predetermined time t1 (S13), and whether or not the detection value TH of the high temperature sensor 6 is lower than the temperature (Tb-T1). Is determined (S14), and the temperature (Tb-T
If it is less than 1), it is determined in step 15 whether water is being refilled in the tank 3. Here, whether or not water is being refilled in the tank 3 is determined based on whether or not the water supply means 10 is open.

Within a predetermined time t1, the detection value TH of the high temperature sensor 6 becomes lower than the temperature (Tb-T1) and the tank 3
If the water is not refilled within the timer, a timer 19
To start measurement (S16). Note that the timer 19 has a plurality of timing functions. In step 17, it is determined whether or not the state in which water is not being refilled in the tank 3 has continued for a predetermined time. It is assumed that water filling has been performed, and the pump 4 is turned off and the process ends (S18). Step 13 to Step 1
If it is not determined that the water filling is completed in the sequence leading to 7,
The determination is performed according to the sequence from step 19 on.

In step 19, the heat medium supply valve 17
It is determined whether or not the time t from when the switch is opened is within a predetermined time t2, and the detection value TH of the high temperature sensor 6 is set to the temperature (Tb-T
2) It is determined whether the temperature is lower than (T20). If the temperature becomes lower than the temperature (Tb-T2) within a predetermined time t2, it is determined in step 21 whether water is being refilled in the tank 3 or not. Here, whether or not water is being refilled in the tank 3 is determined based on whether or not the water supply means 10 is open.

Within a predetermined time t2, the detection value TH of the high temperature sensor 6 becomes lower than the temperature (Tb-T2) and the tank 3
If the water is not refilled within the timer, a timer 19 is used to measure the elapsed time after the determination that the water is not refilled in step 21.
To start measurement (S22). In step 23, it is determined whether or not the state in which water is not being refilled in the tank 3 has continued for a predetermined time. It is assumed that water filling has been performed, and the pump 4 is turned off and the process ends (S18). Step 19 to Step 2
If it is not determined that the filling is completed in the sequence up to 3,
The determination is performed according to the sequence from step 24.

In step 24, the heat medium supply valve 17
It is determined whether or not the time t from when the switch is opened is within a predetermined time t3, and the detection value TH of the high temperature sensor 6 is set to the temperature (Tb-T
3) It is determined whether or not the temperature is lower than (Tb-T3) within a predetermined time t3. Here, whether or not water is being refilled in the tank 3 is determined based on whether or not the water supply means 10 is open.

Within a predetermined time t3, the detection value TH of the high temperature sensor 6 becomes lower than the temperature (Tb-T3) and the tank 3
If the water is not refilled within the timer, the timer 19 is used to measure the elapsed time after the determination that the water is not refilled in step 26.
To start measurement (S27). In step 28, it is determined whether or not the state in which water is not being refilled in the tank 3 has continued for a predetermined time. It is assumed that water filling has been performed, and the pump 4 is turned off and the process ends (S18). Step 24 to Step 2
If it is not determined 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 is terminated (S30).

FIG. 6 is a sequence diagram showing another embodiment of the present invention. Note that the same step numbers in FIG. 6 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 in step 14 that the detected value of the high temperature sensor 6 has become lower than the temperature (Tb-T1).
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 being refilled. Then, when the water refilling in the tank 3 is completed, the pump 4 is turned off and the processing ends (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 lower than the temperature (Tb-T2).
In step 35, it is determined whether or not a predetermined time has elapsed since the timer 19 was started in step 34. If the predetermined time has elapsed, it is determined in step 33 whether or not the tank 3 is being refilled. Then, when the water refilling in the tank 3 is completed, the pump 4 is turned off and the processing 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 lower 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. If the predetermined time has elapsed, it is determined in step 33 whether or not the tank 3 is being refilled. Then, when the water refilling in the tank 3 is completed, the pump 4 is turned off and the processing ends (S1).
8).

In the embodiment shown in FIGS. 2 and 6, it is determined in step 14 whether the temperature is lower than the temperature (Tb-T1). Tb− (T1 + α)｝ may be used to determine whether the temperature is less than Tb− (T1 + α)｝.
{Tb- (T2 + β)} taking into account the heat radiation effect of
May be determined based on whether the value is less than
5 may also be determined based on whether or not the temperature is lower than {Tb− (T3 + γ)} in consideration of the heat radiation action of the heating radiator 16.

[0032]

According to the present invention, it is determined whether or not the filling of the tank and the pipe of the hot water heating apparatus has been completed based on the estimated temperature decrease rate, the actual temperature decrease rate, and the open / close state of the water supply means provided in the tank. Can be determined more reliably than in the conventional example.

[Brief description of the 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 according to 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 detection value of a high temperature sensor and time.

FIG. 5 is a diagram showing a relationship between a water level in a tank and an open / close state of a water supply unit.

FIG. 6 is a sequence diagram showing the contents of control according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water heating apparatus 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

Continuation of the front page (56) References JP-A-3-233231 (JP, A) JP-A-3-244926 (JP, A) JP-A-62-155448 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) F24D 3/10 F24D 3/00

Claims (1)

(57) [Claims] 1. A circulation path for circulating hot water for heating, a heat exchanger for heating hot water for heating in the circulation path, and a temperature detecting means for detecting a temperature of the hot water heated by the heat exchanger; A bypass that includes a pump for circulating hot water, a tank with a water supply means, a heating load, and a heating medium supply valve that can be opened to supply hot water to the heating load and bypass the circulation path A hot water heating apparatus provided with a channel, wherein the pump is turned on while filling the tank with water supply means, water is filled in the hot water heating apparatus, and the heat medium after heating of the heat exchanger is stopped based on a value detected by the temperature detection means. Estimate the temperature decrease rate detected by the temperature detecting 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. Value detected by the subsequent temperature detection means And a judging means for judging whether or not water filling in the hot water heating apparatus has been completed based on the temperature decrease rate and the open / close state of the water supply means.