JPH06147509A - Hot water heating system - Google Patents

Abstract

PURPOSE:To effectively detect incomplete filling of water by heating a heat exchanger while circulating hot water in a tank and a circulation passage, and obtaining a temperature difference between a detected value of a return temperature sensor after a predetermined time is elapsed and a detected value of a bypass temperature sensor to judge complete filling of water. CONSTITUTION:A hot water heating apparatus 1 has a heat exchanger 6 to be heated by a burner 13, supplies hot water obtained from the exchanger 6 to a heat radiator 18 via a circulation passage 2 to heat, and then circulates it to the exchanger 6 through a water tank 4. In this case, in the case of an initial use, a heating medium supply valve 19 and a feed water valve 11 are opened to supply hot water to the tank 4. Then, a pump 5 is energized to circulate the hot water, and the burner 13 is operated to be burned. When a predetermined time is elapsed, a temperature difference between detected temperatures of a bypass temperature sensor 17 and a return temperature sensor 17 is calculated, incomplete filling of water is decided if the difference is a predetermined temperature or lower, the operations of the pump 5 and the burner 13 are stopped, and the valve 11 is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an object to provide a hot water heating system for reliably determining whether or not the initial injection of hot water is completed.

[0002]

2. Description of the Related Art Conventionally, as a method for completing the initial water injection of a hot water heating system, there is an example of Japanese Patent Laid-Open No. 3-177716. In this example, the hot water supply interval is measured to measure the hot water supply interval. It was judged that the initial water injection was completed when the time exceeded a certain time.

As another example, there is an example of Japanese Patent Laid-Open No. 3-177717, in which the initial water injection is judged to be completed when the initial water injection time exceeds a certain value.

[0004]

However, in the above-mentioned conventional example, when the open / close type heat medium supply valve is provided in the hot water circulation passage constituting the hot water heating system (here, the heat medium supply valve is opened and the pump is opened). The residual water in the hot water circulation path is eliminated by operating the hot water circulation circuit), and it is determined that the initial water injection is completed after a certain period of time even if the heat medium supply valve failed and did not open. As a result, accumulated air remains in the hot water circulation path, and when heating operation is performed, air is mixed into the pump, which causes a failure of the hot water heating system.

Therefore, in the present invention, the above problems are solved,
It is an object of the present invention to provide a hot water heating system having a configuration that has not existed in the past, which can reliably determine whether or not the initial injection of hot water has been completed.

[0006]

In order to solve the above problems, the present invention provides a circulation path for circulating hot water, a heat exchanger for heating the hot water in the circulation path, and a pump for feeding the hot water. A heating load, a tank for replenishing circulating hot water, and a return temperature sensor for detecting the temperature of the hot water after being heated by a heat exchanger and being radiated by the heating load, the circulation path is provided with a heat A bypass temperature sensor that branches the start end of the bypass passage downstream of the exchanger, the end of the bypass passage is connected to the upstream side of the return temperature sensor in the circulation passage, and detects the temperature of hot water flowing in the bypass passage. A hot water heating device comprising: a heating temperature of a bypass temperature sensor detection value and a return temperature sensor detection value after a lapse of a certain time by heating a heat exchanger while pouring water into a tank and turning on a pump. And in that a determining means for determining whether water injection into the hot-water heating device is completed by the first feature by.

Further, a circulation path for circulating hot water, a heat exchanger for heating the hot water in the circulation path, a pump for feeding the hot water, a heating load, and a tank for supplying the circulating hot water, A return temperature sensor for detecting the temperature of hot water after being heated by a heat exchanger and being radiated by the load for heating, the circulation path branches the start end of the bypass path downstream from the heat exchanger, and the bypass A hot water heating device having a bypass temperature sensor connected to an upstream side of a return temperature sensor in the circulation path and having a bypass temperature sensor for detecting a temperature of hot water flowing in the bypass path in the bypass path. The initial temperature difference between the detected value of the bypass temperature sensor and the detected value of the return temperature sensor after a lapse of a certain time without turning on the heat exchanger while turning on the pump is stored, and after the initial temperature difference is stored, water is poured into the tank. While the pump is turned on, the heat exchanger is heated for a certain period of time, and the heating temperature difference between the detected value of the bypass temperature sensor and the detected value of the return temperature sensor after heating the heat exchanger for a certain period of time is obtained, and the initial temperature difference and the heating are obtained. A second feature is that a determining unit is provided to determine whether or not the water injection into the hot water heating device is completed based on the temperature difference.

Furthermore, a first circulation path for circulating hot water, a tank for supplying hot water to the first circulation path, a pump for feeding hot water, a heat exchanger for heating the hot water, and a high temperature water A required first load is provided, and a start end of a bypass passage that short-circuits the first circulation passage is branched from the first circulation passage on the downstream side of the heat exchanger, and an end of the bypass passage is connected to a tank of the first circulation passage. A bypass temperature sensor connected to the upstream side and provided in the bypass passage for measuring the temperature of hot water flowing through the bypass passage, and a return temperature sensor for detecting the return hot water temperature between the end of the bypass passage and the tank in the first circulation passage. A start end of the second circulation passage is branched from between the pump and the heat exchanger in the first circulation passage, and an end of the second circulation passage is connected to an upstream side of a bypass passage end in the first circulation passage; 2 Circulation requires low temperature water A hot water heating device including a load, which heats a heat exchanger while pouring water into a tank and turning on a pump to heat a detection value of a bypass temperature sensor and a detection value of a return temperature sensor after a lapse of a certain time. Due to the temperature difference,
A third feature is that a determination means for determining whether or not water injection is completed is provided in the hot water heater.

Further, a first circulation path for circulating hot water, a tank for supplying hot water to the first circulation path, a pump for feeding hot water, a heat exchanger for heating the hot water, and a high temperature water A required first load is provided, and a start end of a bypass passage that short-circuits the first circulation passage is branched from the first circulation passage on the downstream side of the heat exchanger, and an end of the bypass passage is connected to a tank of the first circulation passage. A bypass temperature sensor connected to the upstream side and provided in the bypass passage for measuring the temperature of hot water flowing through the bypass passage, and a return temperature sensor for detecting the return hot water temperature between the end of the bypass passage and the tank in the first circulation passage. A start end of the second circulation passage is branched from between the pump and the heat exchanger in the first circulation passage, and an end of the second circulation passage is connected to an upstream side of a bypass passage end in the first circulation passage; 2nd circuit requires low temperature water A hot water heating device comprising: an initial temperature difference between a detected value of the return temperature sensor and a detected value of the bypass temperature sensor after a lapse of a certain time from turning on the pump while pouring water into the tank. After storing the temperature difference, water is poured into the tank to heat the heat exchanger while turning on the pump, and the heating temperature difference between the return temperature sensor detection value and the bypass temperature sensor detection value after a certain period of time has elapsed The fourth feature is that a determining means is provided for determining whether or not the water injection into the hot water heating device is completed based on the difference between the initial temperature and the heating temperature.

[0010]

In the present invention, the water is circulated in the tank and the circulation path while the hot water is circulated by the pump to heat the heat exchanger for a certain period of time to heat the detection value of the return temperature sensor and the detection value of the bypass temperature sensor. Since the temperature difference is obtained, it is possible to reliably determine whether or not the water injection operation in the hot water heater is completed based on the heating temperature difference.

Further, the hot water circulation by the pump is performed for a certain time while the tank and the circulation path are filled with water without heating the heat exchanger, and the initial temperature difference between the detection value of the return temperature sensor and the detection value of the bypass temperature sensor is increased. After the initial temperature difference is stored, the heat exchanger is heated for a certain period of time to obtain the heating temperature difference between the return temperature sensor detection value and the bypass temperature sensor detection value, and the heating temperature difference is corrected with the above initial temperature difference. Therefore, it is possible to more reliably determine whether or not the water injection operation in the hot water heating device is completed based on the corrected calculated value.

[0012]

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 18 described later. A return temperature sensor 3 for detecting the return hot water temperature and a tank 4 for storing the circulating hot water are provided in the circulation path 2 from the upstream side.
A pump 5 for feeding hot water, a heat exchanger 6 for heating the hot water, and a high temperature sensor 7 for detecting the temperature of the hot water heated by the heat exchanger 6 are sequentially arranged.

The tank 4 is an ON-OFF type low water level sensor 8 which is turned on when a predetermined low water level or higher in the tank is detected, and is turned ON when a predetermined medium water level or higher higher than the low water level is detected. The ON-OFF type middle water level sensor 9 and the ON-OFF type high water level sensor 10 which is turned ON when a predetermined high water level higher than the middle water level is detected are arranged, and the water supply valve 11 is opened. By doing so, hot water can be injected into the tank 4. An overflow port 12 is provided in the tank 4.

The heat exchanger 6 is heated by the burner 13, the on-off valve 14 is opened, and the opening degree of the proportional valve 15 is varied to obtain the required gas amount.

Reference numeral 16 is a high temperature sensor 7 in the circulation path 2.
It is a bypass path that branches the start end at a point E on the further downstream side and is connected to the end at a point F on the upstream side of the return temperature sensor 3 in the circulation path 2. The hot water temperature flowing in the bypass path 16 is the bypass temperature sensor 17 Has been detected by.

Reference numeral 18 denotes a heating radiator such as a panel heater. The heating radiator 18 can circulate the heating hot water heated by opening the heat medium supply valve 19.

Reference numeral 20 is a controller for controlling the controlled devices such as the proportional valve and the pump described above. In the controller 20, a timer 21 having a time counting function, an arithmetic unit 22 for performing arithmetic processing, an arithmetic value, etc. Storage unit 23 for storing
And a determination means 24 for determining whether or not the water injection into the heating device is completed.

Reference numeral 25 is a remote controller connected to the controller 20, reference numeral 26 is a test operation switch for performing a water injection operation in the heating apparatus 1, and reference numeral 27 is a display portion for displaying the operation status of the appliance, the location of the appliance failure, and the like. is there.

FIG. 2 is a sequence diagram showing the contents of control of the present invention. Turn on the trial run switch 26 (S
1), the heat medium supply valve 19 is opened (S2), and the water supply valve 11
Open to supply hot water into the tank 4 and turn on the pump 5.
As a result, the hot water in the circulation path 2 is circulated, and the heat exchanger 6 is heated by the burner 13 (S3).

In step 4, it is judged whether or not the time after heating the heat exchanger 6 has passed a fixed time t0, and the fixed time t0 is reached.
When the temperature exceeds, the detected value Th1 of the bypass temperature sensor 17
And the heating temperature difference ΔT between the detected value Th2 of the return temperature sensor and
A (ΔTA = Th1−Th2) is calculated (S5), and it is determined whether the heating temperature difference ΔTA is equal to or higher than a constant temperature Y ° C. (S5).
6) If the temperature is equal to or higher than the constant temperature Y ° C., it is considered that the tank 4 and the pipe in the hot water heater 1 are reliably filled with water,
The water supply valve 11 is closed to end the water filling (S7). Here, the fixed time t0 is the time required for the heated hot water to reach the circulation path 2 and the bypass path 16, and may be determined in advance by the heating system designer through experiments or the like. After step 7, if the heating operation command is issued, the heating operation may be performed.

In step 6, if the heating temperature difference ΔTA is not equal to or higher than the constant temperature Y ° C., the hot water circulation failure due to the failure of the pump 5 or the heating medium supply valve 19 fails so that the heating radiator 18 cannot be opened. When it is determined that the hot water is not circulating, the pump 5 is turned off, the combustion by the burner 13 is stopped, the water supply valve 11 is closed, and the safety operation for displaying the failure point on the display unit 27 is performed (S8).

FIG. 3 is a sequence diagram showing the contents of control of the present invention. The test operation switch 26 for injecting water into the tank 4 and the pipe is turned on (S11), the heat medium supply valve 22 is opened (S12), and the water supply valve 11 is opened to inject water into the tank 4 to pump the pump 5. Drive (S1
3), it is determined whether 5 minutes have elapsed since the start of step 13 (S14). Although the determination elapsed time after the start of step 13 is 5 minutes here, it is not necessarily limited to 5 minutes and may be longer or shorter than 5 minutes.

In step 15, an initial temperature difference ΔT (ΔT = Th1−Th2) between the return warm water temperature Th2 detected by the return temperature sensor 3 and the bypass warm water temperature Th1 detected by the bypass temperature sensor 17 is calculated.

In step 16, it is judged whether or not the absolute value of the above-mentioned initial temperature difference ΔT is smaller than a constant value X ° C. in consideration of detection error and the like. The difference ΔT is stored in the storage unit 29 (S17). The initial temperature difference ΔT is theoretically 0 ° C. if no detection error or pipe clogging occurs (because heating by the heat exchanger is not performed).

In step 16, the initial temperature difference Δ
If the absolute value of T is not less than X ° C, the pump operation is continued while supplying water into the tank until the absolute value of the initial temperature difference ΔT becomes less than X ° C without proceeding to step 7 and thereafter.

At step 18, the on-off valve 14 is opened,
The opening degree of the proportional valve 15 is varied to burn the burner 13 to obtain the required heating hot water temperature, and it is determined whether or not the time after the heating operation in step 18 has passed a certain time t1 ( S19).

Here, the fixed time t1 is a sufficient time required for the heating circulating water heated in each of the circulation path 2 and the bypass path 16 to spread, and is determined in advance by the heating system setter by an experiment or the like. It is good to do it.

When the constant time t1 has elapsed in step 19, the detected value T of the return temperature sensor 3 when the constant time t1 has elapsed
h2 and the bypass temperature sensor 17 when a certain time t1 has elapsed
Of the detected temperature Th1 and the initial temperature difference ΔT stored in the storage unit 29 to calculate the heating temperature difference ΔTA (S2
0). Here, the heating temperature difference ΔTA is ΔTA = Th1−T
It is calculated by the calculation unit 22 according to an expression represented by h2 + ΔT.

In step 21, it is judged whether or not the heating temperature difference ΔTA is equal to or higher than a constant temperature Y ° C. Close and end water filling (S2
2). After step 22, if the heating operation command is issued, the heating operation may be performed.

If the heating temperature difference ΔTA is not equal to or more than the constant temperature Y ° C. in step 21, the hot water circulation failure due to the pump 5 failure or the heat medium supply valve 19 does not open due to the failure, so that the hot water inside the heating radiator 18 is not opened. Is determined not to circulate, the pump 5 is turned off, the combustion by the burner 13 is stopped, the water supply valve 11 is closed, and a safe operation is performed to display the failure point on the display unit 27 (S23).

In short, according to the present invention, the high temperature water heated by the heat exchanger 6 flowing through the bypass 16 and the hot water having a heat radiating action by the heating radiator 18 having a temperature lower than the high temperature water are mixed. The hot water temperature detected by the return temperature sensor 3 becomes lower than the hot water temperature detected by the bypass temperature sensor 17 when the heating hot water circulation is normally performed, so that the water filling control is performed. When the heat medium supply valve 19 does not open or when hot water does not circulate normally due to a pump failure or the like, the heating temperature difference between the detected value of the bypass temperature sensor 17 and the detected value of the return temperature sensor 3 becomes small, It is a hot water heating system that takes advantage of not exceeding a certain value.

FIG. 4 is a diagram showing the configuration of another embodiment of the hot water heating system of the present invention. Reference numeral 31 is a hot water heater, and hot water is circulated through the first circulation path 32. In the first circulation path 32, a return temperature sensor 33 that detects the return hot water temperature, a tank 34 that stores the circulating hot water, and a tank 3
4, a low temperature sensor 35 for detecting the temperature of the hot water passing through 4,
A pump 36 for circulating hot water, a heat exchanger 37 for heating the circulating hot water, and a high temperature sensor 38 for detecting the temperature of the hot water heated by the heat exchanger 37 are arranged in this order.

In the tank 34, a low water level electrode 39 for detecting a predetermined low water level or higher, a medium water level electrode 40 for detecting a predetermined medium water level or higher higher than the low water level, and a high water level higher than the medium water level. High water level electrode 4 for detecting above a predetermined high water level
1 and the water supply valve 42 is opened to open the tank 3
4 and water can be discharged to the outside of the tank 34 by the overflow port 43.

Reference numeral 44 is a burner for heating the above-mentioned heat exchanger 37. The combustion gas amount to the burner 44 is obtained by opening the on-off valve 45 and varying the opening of the proportional valve 46 to obtain the required gas amount. There is.

Reference numeral 47 denotes a second circulation path downstream of the pump 36 and upstream of the heat exchanger 37 and branched from the first end A of the first circulation path 32. The second circulation load 48 requires low-temperature water 48 for heating. Is connected to the first circuit 32 at the terminal B.

Reference numeral 49 denotes a bypass passage which bypasses the starting end C on the downstream side of the high temperature sensor 38 in the first circulation passage 32 and which has a bypass temperature sensor 50 for detecting the temperature of hot water flowing through the bypass passage 49. The terminal D of the bypass passage 49 is connected to the upstream side of the return temperature sensor 33 in the first circulation passage 32.

Reference numeral 51 is a first load for heating which is provided in the first circulation path 32 and requires high temperature water.

Reference numeral 52 denotes a heat medium supply valve that allows hot water to circulate in the first load 51 and the second load 48 by opening the pump 36 while the pump 36 is operating.
It is provided between points B and D described above. still,
Although the heat medium supply valve 52 is provided on the outlet side of the first load 51 and the second load 48 in the circulation path in FIG. 1, it is provided on the inlet side of the first load 51 and the second load 48 in the circulation path. May be.

Reference numeral 53 is a controller for controlling the controlled device such as the proportional valve, which is connected to the remote controller 54. Reference numeral 55 denotes a test operation switch arranged on the remote controller 54 for supplying heating circulating hot water into the tank and the pipe. Reference numeral 56 is a display unit that displays the operating state of the hot water heating device 31, a failure location, and the like.

In the controller 53, a timer 57 having a time counting function and an arithmetic unit 58 for performing arithmetic processing.
The storage unit 59 stores the calculated value and the like, and the determination unit 60 that determines whether or not the water injection into the heating device is completed. In addition, the control of the hot water heating device 31 is performed by the above-described FIG.
3 and the sequence shown in FIG.

[0041]

According to the present invention, the heat exchanger is heated for a certain period of time while circulating hot water in the tank and the circulation path, and the detected value of the return temperature sensor and the detected value of the bypass temperature sensor after a certain period of heating has elapsed. The heating temperature difference due to the fact that hot water does not circulate normally due to a failure of the pump or the heat medium supply valve, because the difference in heating temperature between It is possible to reliably detect incomplete filling of water inside.

Further, in the present invention, as the first step, the initial temperature difference between the detection value of the return temperature sensor and the detection value of the bypass temperature sensor is stored while circulating hot water in the tank and the circulation path. Considering the variations in the sensor detection values, the second step is to heat the heat exchanger for a certain period of time, and obtain the heating temperature difference between the return temperature sensor and the bypass temperature sensor after a certain period of heating. , The heating temperature difference is corrected by the initial temperature difference, and the corrected calculated value is used to determine whether or not the water filling in the tank and the circulation path is completed.Therefore, the hot water normally circulates due to the failure of the pump or the heat medium supply valve. It is possible to detect the incomplete water filling in the heating device due to the failure to do so more reliably.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a hot water heating apparatus of the present invention.

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

FIG. 3 is a sequence diagram showing the content of control of the present invention.

FIG. 4 is a configuration diagram of a hot water heating apparatus of the present invention.

[Explanation of symbols]

 1 Hot Water Heating Device 2 Circulation Path 3 Return Temperature Sensor 4 Tank 5 Pump 6 Heat Exchanger 16 Bypass Path 17 Bypass Temperature Sensor 18 Radiator (Load) 24 Judgment Device 31 Hot Water Heating Device 32 First Circulation Path 33 Return Temperature Sensor 34 Tank 36 Pump 37 Heat Exchanger 47 Second Circulation Path 48 Second Load 49 Bypass Path 50 Bypass Temperature Sensor 51 First Load 60 Judgment Means

Claims (4)

[Claims] 1. A circulation path for circulating hot water, a heat exchanger for heating the hot water in the circulation path, a pump for feeding the hot water, a heating load, and a tank for supplying the circulating hot water. A return temperature sensor for detecting the temperature of hot water after being heated by a heat exchanger and being radiated by the load for heating, the circulation path branches the start end of the bypass path downstream from the heat exchanger, and the bypass A hot water heating device having a bypass temperature sensor connected to an upstream side of a return temperature sensor in the circulation path and having a bypass temperature sensor for detecting a temperature of hot water flowing in the bypass path in the bypass path. While the pump is turned on, the heat exchanger is heated to determine whether the pouring of water into the hot water heating device is completed based on the heating temperature difference between the detection value of the bypass temperature sensor and the detection value of the return temperature sensor after a certain period of time. Size A hot water heating system characterized in that a determining means for determining the temperature is provided. 2. A circulation path for circulating hot water, a heat exchanger for heating the hot water in the circulation path, a pump for feeding the hot water, a heating load, and a tank for supplying the circulating hot water. A return temperature sensor for detecting the temperature of hot water after being heated by a heat exchanger and being radiated by the load for heating, the circulation path branches the start end of the bypass path downstream from the heat exchanger, and the bypass A hot water heating device having a bypass temperature sensor connected to an upstream side of a return temperature sensor in the circulation path and having a bypass temperature sensor for detecting a temperature of hot water flowing in the bypass path in the bypass path. The initial temperature difference between the detected value of the bypass temperature sensor and the detected value of the return temperature sensor after a lapse of a certain time without turning on the heat exchanger while turning on the pump is stored, and after the initial temperature difference is stored, water is poured into the tank. Shipo The heat exchanger is heated for a certain time while the pump is turned on, and the heating temperature difference between the detection value of the bypass temperature sensor and the detection value of the return temperature sensor after heating the heat exchanger for a certain time is calculated, and the initial temperature difference and the heating are obtained. A hot water heating system comprising: a determination unit that determines whether or not water injection into the hot water heating device is completed based on a temperature difference. 3. A first circulation path for circulating hot water,
The first circulation path includes a tank for supplying hot water, a pump for feeding hot water, a heat exchanger for heating the hot water, and a first load that requires high-temperature water, and is provided on the downstream side of the heat exchanger. From the first circulation path, the start end of the bypass path that short-circuits the first circulation path is branched, the end of the bypass path is connected to the tank upstream side of the first circulation path, and the hot water temperature flowing in the bypass path is measured. And a return temperature sensor that detects a return hot water temperature between the end of the bypass passage and the tank in the first circulation passage, and a return temperature sensor between the pump and the heat exchanger in the first circulation passage. The start end of the two circulation paths is branched, the end of the second circulation path is connected to the upstream side of the end of the bypass passage in the first circulation path, and the second circulation path is provided with a second load that requires low-temperature water. It is a hot water heating system, in which water is poured into the tank While the heat is being turned on, the heat exchanger is heated to determine whether the pouring of water into the hot water heating device is completed or not depending on the heating temperature difference between the detection value of the bypass temperature sensor and the detection value of the return temperature sensor after a lapse of a certain time. A hot water heating system characterized by comprising a judging means for judging. 4. A first circuit for circulating hot water,
The first circulation path includes a tank for supplying hot water, a pump for feeding hot water, a heat exchanger for heating the hot water, and a first load that requires high-temperature water, and is provided on the downstream side of the heat exchanger. From the first circulation path, the start end of the bypass path that short-circuits the first circulation path is branched, the end of the bypass path is connected to the tank upstream side of the first circulation path, and the hot water temperature flowing in the bypass path is measured. And a return temperature sensor that detects a return hot water temperature between the end of the bypass passage and the tank in the first circulation passage, and a return temperature sensor between the pump and the heat exchanger in the first circulation passage. The start end of the two circulation paths is branched, the end of the second circulation path is connected to the upstream side of the end of the bypass passage in the first circulation path, and the second circulation path is provided with a second load that requires low-temperature water. It is a hot water heating system, Memorizes the initial temperature difference between the detected value of the return temperature sensor and the detected value of the bypass temperature sensor after a certain time has passed since the pump was turned on. After storing the initial temperature difference, water is poured into the tank and heat is exchanged while the pump is turned on. The heating temperature of the heat exchanger is heated, and the heating temperature difference between the detection value of the return temperature sensor and the detection value of the bypass temperature sensor after a certain time elapses from the heat exchanger heating is obtained. The hot water heating system is provided with a determining means for determining whether or not the water injection has been completed.