JP3336680B2 - 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 Conventionally, as a method of stopping a heating operation of a hot water heating apparatus, there is an example of Japanese Utility Model Laid-Open No. 1-78812. In this example, when the operation switch is turned off, the control valve is closed, and at the same time, the pump is turned off, thereby stopping the heating operation.

[0003] The control valve is provided in a pipe for circulating hot water, and is opened so that hot water heated by the heat source unit can be supplied to a radiator for heating.

[0004]

However, in the above conventional example, there has been a problem that air is accumulated in the piping due to the heated high-temperature circulating hot water. In other words, even when the hot water heating operation is performed after sufficient air release from the piping by an air release valve, bubbles are generated in the piping by circulating the hot water heated by the heat source unit with the pump, and the heating operation is stopped. sometimes there is a problem that bubbles generated stays in the pipe, especially when the radiator for heating constructed by capillary provided on the second floor or the like of the high position from the heat source machines, the majority of the generated bubbles radiator In the case of staying in the narrow tube of the vessel and performing the heating operation again, there is a disadvantage that the pump is liable to break down due to the retained air bubbles as compared with the case where the radiator is installed at the same height position as the heat source unit. Was.

[0005] Therefore, an object of the present invention is to provide a hot water heating apparatus capable of eliminating air such as air bubbles generated by a heating operation without using an air vent valve or the like.

[0006]

In order to solve the above-mentioned problems, the present invention provides a circulation path for circulating hot water, a tank for storing hot water in the circulation path, a pump for circulating hot water, and a burner. A heat exchanger to be heated, a heating terminal such as a radiator, a heating medium supply valve capable of supplying hot water to the heating terminal by opening, and detecting a temperature of the hot water heated by the heat exchanger. A high temperature sensor, a return temperature sensor that detects the temperature of hot water after the heat is radiated by the heating terminal, a start end branched downstream from the high temperature sensor, and a downstream of the heating terminal near an upstream near the return temperature sensor. A heating circuit provided with a bypass circuit having an end connected to a side thereof, wherein when the heating operation switch is turned off, burner combustion is stopped and a close signal is sent to the heat medium supply valve , and the heat medium supply valve
Is completely closed after a predetermined time has passed since the closing signal was sent.
Until the heat medium supply valve is closed.
Allowed to continue up operation, if the difference between the detected value of the detection value and the return temperature sensor with high temperature sensor becomes lower than the predetermined temperature, the heat medium subjected
Assuming that the supply valve is completely closed, set the pump operation to OF
F is characterized in that control means for ending the heating operation is provided.

[0007]

In the present invention, when the heating operation is stopped, the burner combustion is stopped and the heat medium supply valve is closed. However, the pump operation is continued until the heat medium supply valve is securely closed. Bubbles generated by the time the combustion operation is stopped are reliably eliminated, so that bubbles in the piping of the hot water heating apparatus can be eliminated without using an air release valve or the like.

[0008]

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 disposed, and is connected to a heating radiator 17 described later. A return temperature sensor 3 for detecting a return hot water temperature and a tank 4 for storing circulating hot water are provided in the circulation path 2 from the upstream side.
And a pump 5 for supplying 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.

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

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

Reference numeral 16 denotes a high temperature sensor 7 in the circulation path 2.
This is a bypass path that branches off at the start end at point A on the downstream side and connects at the end at point B near the return temperature sensor 3 in the circulation path 2.

Reference numeral 17 denotes a heating radiator such as a panel heater, which is opened when the heat medium supply valve 18 is turned on so that heated heating water can be circulated in the heating radiator 17.

Reference numeral 19 denotes a controller for controlling the above-mentioned controlled devices such as the proportional valve and the pump. The controller 19 includes a timer 20 having a timekeeping function, an arithmetic unit 21 for performing arithmetic processing, an arithmetic value or The storage unit 22 includes a storage unit 22 that stores a detected value and the like, and a determination unit 23 that determines an open / closed state of the heat medium supply valve 18 in the heating device.

Reference numeral 24 denotes a remote controller connected to the controller 20, reference numeral 25 denotes a test operation switch for performing a water injection operation into the heating device 1, reference numeral 26 denotes an operation switch of the heating device 1, and reference numeral 27 denotes an appliance operating state. And a display unit for displaying a failure location of the appliance.

FIG. 2 is a sequence diagram showing the contents of the control of the present invention. In step 1, it is determined whether or not the heating operation switch 26 is turned off. If the heating operation switch is turned off, the on-off valve 14 is closed to stop the combustion of the burner 13, and the heat medium A closing signal is sent to the supply valve 18 to close it (S2). After the combustion of the burner 13 is stopped, no new air bubbles are generated in the pipe due to the high-temperature water for heating. Here, unlike the solenoid valve, the heat medium supply valve 18 does not close instantaneously even when a close signal is sent from the controller 20, and after a predetermined time has passed since the close signal was sent (generally, from two minutes). (After about 5 minutes have passed).

In step 3, the temperature difference (Th1−Th2) between the detection value Th1 of the high temperature sensor 7 and the detection value Th2 of the return temperature sensor 3 becomes less than a predetermined temperature ΔT in consideration of a predetermined detection error or the like. Is determined.

In other words, when the heat medium supply valve 18 is completely closed after the combustion operation is stopped by the burner 13 and only the pump 5 is operated, hot water circulates along the route indicated by the dotted arrow in FIG. Is the above-mentioned temperature difference (Th1−Th2) ≒ 0, and Step 3 utilizes this fact.

In step 3, the temperature difference (Th1-Th)
If 2) is lower than the predetermined temperature ΔT, it is considered that the heat medium supply valve 18 is completely closed, and the pump 5 is turned off to end the heating operation (S4).

In short, according to the present invention, the air bubbles in the pipe generated until the burner combustion is stopped in the heating operation are removed.
The pump is operated until the heat medium supply valve is closed even after the burner combustion is stopped, so that the air bubbles are discharged into the space in the tank and eliminated. Therefore, in the above control example, it is not necessary to newly provide a means such as an air vent valve.

[0020]

According to the present invention, air bubbles generated during the heating operation can be completely eliminated without using an air vent valve or the like. Therefore, it is possible to completely prevent a pump failure caused by the air generated and retained in the pipe by the heating operation.

[Brief description of the drawings]

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

FIG. 2 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 Return temperature sensor 4 Tank 5 Pump 6 Heat exchanger 7 High temperature sensor 13 Burner 17 Heating radiator 18 Heat medium supply valve 19 Controller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24D 3/00 F24D 3/10

Claims (1)

(57) [Claims] 1. A circulation path for circulating hot water, a tank for storing hot water in the circulation path, a pump for circulating hot water, a heat exchanger heated by a burner, and a heating terminal such as a radiator. , A heating medium supply valve capable of supplying hot water to the heating terminal by opening, a high temperature sensor for detecting the temperature of hot water heated by the heat exchanger, and hot water radiated by the heating terminal A hot water heating system comprising: a return temperature sensor for detecting a temperature; and a bypass circuit having a starting end branched downstream from the high temperature sensor and an end connected downstream of the heating terminal on the upstream side near the return temperature sensor. When the heating operation switch is turned off, burner combustion is stopped and a close signal is sent to the heat medium supply valve , and the heat medium supply valve
Is completely closed after a predetermined time has passed since the closing signal was sent.
Until the heat medium supply valve is closed.
Allowed to continue up operation, if the difference between the detected value of the detection value and the return temperature sensor with high temperature sensor becomes lower than the predetermined temperature, the heat medium subjected
Assuming that the supply valve is completely closed, set the pump operation to OF
A hot-water heating device comprising a control means for terminating the heating operation as F.