JPH0814380B2 - Hot water heater - 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 type heating device for performing indoor heating and floor heating with hot water.

[0002]

2. Description of the Related Art Conventionally, hot water heated by the heat of combustion of a burner is supplied to an indoor heat exchanger of an indoor heater or a floor heater so that hot air alone operates only for indoor heating or indoor heating and floor heating. There is known a hot water type heating device that is operated simultaneously with. In this hot water heating device, when the room temperature rises above a predetermined value, for example, a set temperature, intermittent operation in which the convection fan is turned on and off is repeated to maintain the room temperature at the set temperature.

[0003]

However, in the conventional hot water heater, the burner combustion is stopped at the same time as the convection fan is turned off or shortly before the convection fan is turned off when the hot air is independently operated. However, during simultaneous operation, hot water is supplied to the floor heating even if the convection fan is turned off.
Since the burner is burned and the hot water is supplied to the floor heater and the indoor heat exchanger, the indoor temperature easily rises above the set temperature due to the heat radiation of the floor heater or the indoor heat exchanger. For this reason, during simultaneous operation, if the convection fan is turned on and off at the same intervals as in warm air independent operation, the temperature of the indoor heat exchanger will rise further, and the temperature sensor installed near the indoor heat exchanger will However, there is a problem that the accurate room temperature cannot be detected. An object of the present invention is to provide a hot water heating device that prevents an excessive rise in temperature of the indoor heat exchanger when supplying hot water to both the indoor heat exchanger and the floor heater.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a blower casing for sending air into a room, a convection fan for generating an airflow toward the room in the blower casing, and a blower inside the blower casing with hot water. An indoor heat exchanger that heats the flowing air to heat the room, a floor heater that heats the floor with hot water, a heating means that heats the hot water, and the hot water heated by this heating means only for the indoor heat exchanger. And a switching means for switching between a first hot water supply passage for flowing into the room and a second hot water supply passage for supplying hot water heated by the heating means to both the indoor heat exchanger and the floor heater. ing. Further, the present invention has a detection means for detecting an indoor temperature near the indoor heat exchanger, and when the indoor temperature detected by the detection means rises above a predetermined temperature, the first hot water supply path is provided. When switched, the first operation is repeated in which the heating means and the convection fan are repeatedly turned on and off, and the second operation is performed.
When switched to the hot water supply passage, the heating means is operated in accordance with the operation of the floor heater, and the convection fan has a second ON time longer than the first ON time of the convection fan in the first operation. The second that turns on and off
A technical means including a control means for driving is adopted.

[0005]

According to the present invention, when the room temperature rises above a predetermined temperature, and when the switching means is switching to the first hot water supply passage, that is, the hot water heated by the heating means is used only in the indoor heat exchanger. While being supplied, the temperature of the indoor heat exchanger is maintained at a predetermined temperature by performing the first operation in which the heating means and the convection fan are repeatedly turned on and off. Further, when the indoor temperature rises above a predetermined temperature, and when the switching means is switching to the second hot water supply passage, that is, the hot water heated by the heating means is used for both the indoor heat exchanger and the floor heater. Is being supplied to the floor heater, the convection fan is turned on and off at a second on-time that is longer than the first on-time of the convection fan in the first operation. By performing the two operations, the temperature of the indoor heat exchanger is largely prevented from rising even if the heating means is turned on to supply hot water to the floor heater during the second operation. For this reason, the temperature around the room temperature detecting means arranged near the indoor heat exchanger is brought closer to the indoor temperature, and the reliability of the detected value of the indoor temperature is increased.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water type heating apparatus of the present invention will be described based on an embodiment shown in FIGS. FIG. 1 is a block diagram showing a control unit, and FIG. 2 is a diagram showing an overall structure of an air conditioner. The air conditioner 1 includes a blower casing 2, a convection fan 3, a cooling device 4, a hot water circuit 5, a gas burner 6, and a control circuit 7, and an indoor unit 8 in which these are arranged indoors.
And the outdoor unit 9 arranged outdoors.

The blower casing 2 is provided in the indoor unit 8 and has an inlet 21 for sucking indoor air into the inside at one end and an outlet 22 for blowing an air flow into the room at the other end.
A movable louver 23 driven by a stepping motor (not shown) is rotatably attached to the air outlet 22.

The convection fan 3 is provided in the blower casing 2 and, when turned on, generates an airflow toward the room in the blower casing 2. The amount of air blown by the convection fan 3 is automatically controlled by the control circuit 7 so that the amount of air blown by the control circuit 7 such as ultra-light wind [10th speed], light wind [9th speed], weak wind [8th speed], etc. The speed changes.

The cooling device 4 is well known, and is composed of a refrigerant compressor 41, a refrigerant condenser 42, a refrigerant evaporator 43, and a refrigerant pipe 44 connecting these in an annular shape.
The refrigerant compressor 41 is provided in the outdoor unit 9 and has a rotation speed that changes depending on the frequency. The refrigerant compressor 41 discharges the refrigerant sucked and compressed by the refrigerant evaporator 43 toward the refrigerant condenser 42.
The refrigerant condenser 42 is provided inside the outdoor unit 9, and heat-exchanges the refrigerant flowing into the inside with the outside air blown by the electric fan 45 to condense the refrigerant. The refrigerant evaporator 43 is provided in the blower casing 2 and heat-exchanges the refrigerant flowing into the inside with the room air sucked by the convection fan 3 to evaporate the refrigerant and perform indoor cooling.

The hot water circuit 5 is a well-known one, and includes an indoor heat exchanger 51, a floor heater 52, an outdoor heat exchanger 53, a circulation pump 54, a solenoid valve 55, and a hot water pipe 56 connecting these.
And so on. The indoor heat exchanger 51 is provided on the downstream side of the refrigerant evaporator 43 in the blower casing 2, and some fins are connected to the fins of the refrigerant evaporator 43. The indoor heat exchanger 51 exchanges heat between hot water and the indoor air sucked by the convection fan 3 to heat the indoor air to perform indoor heating. The indoor heat exchanger 51 constitutes a hot water type indoor heater together with the blower casing 2 and the convection fan 3. The floor heater 52 is provided in a bypass conduit 57 that branches from between the indoor heat exchanger 51 and the outdoor heat exchanger 53 and extends between the indoor heat exchanger 51 and the circulation pump 54. This floor heater 52 is a hot water mat drawn on the floor in the room or a hot water panel installed in the floor,
The floor is heated by heating the mat with warm water. The outdoor heat exchanger 53 is disposed in the outdoor unit 9 and heats the hot water by exchanging heat of combustion generated by the combustion of the gas burner 6 with the hot water flowing inside. The circulation pump 54 is arranged in the outdoor unit 9, generates a circulating flow of hot water in the hot water circuit 5, and supplies the hot water heated by the outdoor heat exchanger 53 to the indoor heat exchanger 51 and the floor heater 52. To do. The solenoid valve 55 is the switching means of the present invention, and is arranged in the outdoor unit 9, and when it is turned on, it opens the bypass line 57, and when it is turned off, the bypass line 57.
Close. When this electromagnetic valve 55 is turned off, a first hot water supply passage (solid line arrow in FIG. 2) that supplies hot water heated by the outdoor heat exchanger 53 only to the indoor heat exchanger 51 is formed. When the solenoid valve 55 is turned on, the hot water heated by the outdoor heat exchanger 53 is supplied to the indoor heat exchanger 51 and the floor heater 5.
A second hot water supply passage (broken line arrow in FIG. 2) that supplies both the water and the water is formed.

The gas burner 6 is the heating means of the present invention, and is provided inside the outdoor unit 9 and is a mixture of fuel gas supplied from the gas supply passage 61 and combustion air blown by the combustion fan 62. To burn. The gas burner 6 is operated with the combustion capacity of the rated capacity by changing the air flow rate of the combustion fan 62 and the opening degree of the proportional valve 64. Further, in the gas supply passage 61, a solenoid valve 63 that opens when turned on and closes when turned off, and the opening degree of the gas supply passage 61 is changed according to the amount of energization to change the fuel to the gas burner 6. A proportional valve 64 for adjusting the gas supply amount is provided. The amount of air blown by the combustion fan 62 is automatically controlled by the control circuit 7 to control the amount of electricity,
The air volume (fan speed) switches, such as weak wind, medium wind, and strong wind.

The control circuit 7 is the control means of the present invention, and convection is performed according to the outputs of the operation switch 71, the mode changeover switch 72, the floor heating switch 73, the room temperature sensor 74, the room temperature setting device 75 and the water temperature sensor 76. Fan 3, refrigerant compressor 41, electric fan 45, circulation pump 54, solenoid valve 55, combustion fan 62, solenoid valve 63 and proportional valve 64.
It controls the energization amount. The operation switch 71 is
When the start switch of the air conditioner 1 is turned on, a power source (not shown) is connected to each electric appliance of the air conditioner 1.
The mode changeover switch 72 is a switch for changing the air conditioning mode of the room, and when any one of the cooling operation 72a, the heating operation 72b and the dry operation 72c is selected, the operation in the air conditioning mode is instructed. Floor heating switch 7
3 turns off the solenoid valve 55 to switch to the first hot water supply passage when turned off, and turns on the solenoid valve 55 to turn on the second hot water supply passage.
Switch to the hot water supply channel. The room temperature sensor 74, which is the detection means of the present invention, is attached near the refrigerant evaporator 43, detects the temperature of the indoor air sucked into the blower casing 2, and converts the detected value into an electric signal. Control circuit 7
Send to The room temperature setting device 75 sets the temperature of the indoor air, converts the set value into an electric signal, and sends the electric signal to the control circuit 7. The water temperature sensor 76 detects the hot water temperature in the hot water circuit 5, converts the detected value into an electric signal, and sends the electric signal to the control circuit 7.

At the start of heating operation, the control circuit 7 determines the zone shown in FIG. 3, for example, by the temperature difference between the room temperature detected by the room temperature sensor 74 and the set temperature (Ts) set by the room temperature setting device 75. Set the initial operation code [see Table 1] based on the zone and start heating operation. Further, the control circuit 7 controls that the room temperature is in the zone k during the heating operation.
Alternatively, when the zone is in the zone j and the zone does not change for a predetermined time, the rank of the operation code is changed to set the operation code to 0. In this case, if the floor heating switch 73 is turned off, as shown in the time chart of FIG. 4, the convection fan 3 is driven at the 10th speed (ultra-fine wind) at the same time when the operation code becomes 0 (the combustion of the gas burner 6 is stopped). Run for 1 minute and then stop. And 3 after the operation code becomes 0
After the minute, the operation code is forcibly set to 1 (combustion start of the gas burner 6), and 40 seconds after that, the convection fan 3 is operated, and this state is continued for 2 minutes and 20 seconds. Then, after the end of the time chart of FIG. 4, the subsequent control is determined depending on which zone the room temperature is. Specifically, when the indoor temperature is a zone lower than the zone j, the normal operation is returned to, and when it is the zone j, the control shown in the time chart of FIG. 4 is repeated.

When the indoor temperature is in the zone k, as shown in the time chart of FIG. 5, the operation code is set to 0, the convection fan 3 is operated at 10th speed for 1 minute, and then stopped. Let And the operation code is 0
After 8 minutes, the operation code was forcibly set to 1, and 40 seconds later, the convection fan 3 was activated, and this state was changed to 2 minutes 2
Continue for 0 seconds. If the indoor temperature is still in the zone k even if the above operation is continued four times, the operation code is set to 0 until the zone j is entered, and the convection fan 3 is operated at the 10th speed for 1 minute, and then for 7 minutes 40 seconds. Repeat off and on for 3 minutes and 20 seconds.

Further, when the floor heating switch 73 is turned on when the operation code becomes 0 as described above during the heating operation, the control circuit 7 operates as shown in the time chart of FIG. At the same time that the operation code becomes 0 (the gas burner 6 operates according to the operating state of the floor heater 52), the convection fan 3 is operated at 9th speed (light wind) for 1 minute and then stopped. Then, for example, 4 minutes after the operation code becomes 0, the convection fan 3 is operated at 9th speed for 4 minutes. When the room temperature is within the zone j after the time chart of FIG. 6 is finished, the convection fan 3 is operated until the room temperature is outside the zone j as shown in the time chart of FIG.
Repeat 9 minutes for 4 minutes on and 4 minutes off. Furthermore, after the time chart of FIG.
If the temperature is within the range, as shown in the time chart of FIG.
Repeat 10 minutes off, 4 minutes on at high speed. Then, when the indoor temperature is in a zone lower than the zone j, the normal operation is resumed.

[0016]

[Table 1]

Further, the control circuit 7 lowers the operation code by one rank when the room temperature zone shifts to the upward direction, and raises the operation code by one rank when the room temperature zone shifts to the downward direction (proportional control). ). When the indoor temperature is within the timer time shown in Table 2 in the same zone, the operation code is changed as shown in Table 2 (integral control).
The timer time may be freely changed when the air conditioner 1 is installed.

[0018]

[Table 2]

FIG. 9 is a flow chart showing the control of the convection fan 3 when the heating operation is started by the control circuit 7. First, the heating operation 7 is first performed by the mode changeover switch 72.
It is determined whether or not 2b is turned on (step S
1). If the determination result in step S1 is No,
The control of step S1 is performed. If the determination result in step S1 is Yes, the indoor temperature (Ti) and the set temperature (Ts) are read (step S2), and the zone (see FIG. 3) is determined from the temperature difference between the indoor temperature and the set temperature. After determining (step S3), an initial operation code [see Table 1] based on the determined zone is set (step S4), and the convection fan 3 is set to a fan speed (1st to 8th speed) corresponding to the initial operation code.
It is turned on at high speed (step S5).

Then, it is judged whether or not a predetermined time has passed (step S6). If the determination result in step S6 is No, control in step S6 is performed. If the result of the determination in step S6 is Yes, the heating operation control is performed (step S7).

FIG. 10 is a flow chart showing the control of the convection fan 3 during the heating operation control by the control circuit 7.
First, it is first determined whether or not the heating operation 72b is turned off in the mode changeover switch 72 (step S).
11). If the determination result of step S11 is Yes, the control of step S1 is performed. Also, step S1
If the determination result of 1 is No, the indoor temperature (Ti) and the set temperature (Ts) are read (step S12), and a proportional control routine or an integral control routine is performed from the temperature difference between the indoor temperature and the set temperature ( In step S13), the operation code (see Tables 1 and 2) determined in the proportional control routine or the integral control routine is set (step S14).

Then, it is judged whether or not the operation code is set to 0 (step S15). If the determination result of step S15 is No, control of step S11 is performed. If the determination result in step S15 is Yes, it is determined whether the floor heating switch 73 is turned on (step S16). If the determination result in step S16 is No, the first operation control routine (see the time charts in FIGS. 4 and 5) at the time of warm air alone operation for only indoor heating is performed (step S17), and the control in step S11 is performed. I do. Moreover, the determination result of step S16 is Yes.
In the case of, the second operation control routine (see the time charts of FIGS. 6, 7, and 8) at the time of simultaneous operation of indoor heating and floor heating is performed (step S18), and the control of step S11 is performed.

The operation of the air conditioner 1 during the heating operation will be described with reference to FIGS. 1 to 10. When the heating operation 72b is turned on by the mode changeover switch 72, the circulation pump 54 is turned on to generate a circulating flow of hot water in the hot water circuit 5. Then, the combustion fan 62, the solenoid valve 63, and the proportional valve 64 are turned on. Then, the fuel gas is supplied to the gas burner 6 through the gas supply passage 61, and the combustion fan 62
The combustion air is also supplied to the gas burner 6 by the rotation of the.

At this time, when ignition is performed by an ignition device (not shown), combustion is started in the gas burner 6. Therefore, the hot water flowing in the outdoor heat exchanger 53 is heated by the combustion heat generated by the combustion of the gas burner 6. The heated hot water is supplied to the indoor heat exchanger 51 or the floor heater 52 by the pumping force of the circulation pump 54.

A) First operation When the floor heating switch 73 is turned off, the solenoid valve 55 is also turned off, so that the bypass line 57 is closed,
It is switched to the first hot water supply passage as shown by the solid line in FIG. Therefore, the hot water heated by the outdoor heat exchanger 53 is
It is supplied only to the indoor heat exchanger 51.

On the other hand, the convection fan 3 determines a zone (see FIG. 3) from the temperature difference between the room temperature detected by the room temperature sensor 74 and the set temperature set by the room temperature setting device 75, and the zone is determined. The fan is turned on at a fan speed (1st to 8th speed) according to the initial operation code [see Table 1] based on the control (control at the start of heating operation). Therefore, the indoor air blown by the convection fan 3 is heated by the indoor heat exchanger 51 and blown out from the blowout port 22, whereby only warm air heating is performed.

Here, when the indoor temperature has risen above the set temperature, that is, when the zone is within j, k and the timer time shown in Table 2 has elapsed, the operation code is proportional control and integral control. Is set to 0 by. At this time, the room temperature is higher than the set temperature, and the time chart of FIG. 4 is shown for the purpose of indicating that the detection value of the room temperature sensor 74 attached near the indoor heat exchanger 51 indicates a temperature close to room temperature. As described above, the fan speed (air volume) of the convection fan 3 is switched from, for example, 8th speed to 10th speed. Then, one minute after the operation code is set to 0, the convection fan 3 is turned off. Then, 3 minutes after the operation code is set to 0, the operation code is forcibly set to 1,
40 seconds after the operation code is set to 1, the fan speed of the convection fan 3 is turned on at, for example, 8th speed.

Then, three minutes after the operation code is set to 1, the zone (see FIG. 3) is determined from the temperature difference between the indoor temperature and the set temperature set by the room temperature setting device 75,
When the determined zone is equal to or less than j, the control at the start of heating operation is performed. When the determined zone is k, the indoor temperature is still much higher than the set temperature, so as shown in the time chart of FIG. 5, the operation code is forcibly set to 0 and the convection fan is set. The fan speed of No. 3 is switched from, for example, 8th speed to 10th speed, and one minute after the operation code is set to 0, the convection fan 3 is turned off. Then, 8 minutes after the operation code is set to 0, the operation code is forcibly set to 1, and 40 seconds after the operation code is set to 1, the fan speed of the convection fan 3 is turned on at, for example, 8th speed. . Therefore, by repeating the first operation until the zone enters j, it is possible to prevent the temperature of the indoor heat exchanger 51 from excessively rising during the heating operation.

B) Second operation On the contrary, when the floor heating switch 73 is turned on,
Since the solenoid valve 55 is also turned on, the bypass conduit 57 is opened and switched to the second hot water supply conduit shown by the broken line in FIG. Therefore, the hot water heated by the outdoor heat exchanger 53 is supplied to the indoor heat exchanger 51 and the floor heater 52.

Here, when the room temperature has risen above the set temperature, that is, when the zone is within j, k and the timer time shown in Table 2 has elapsed, the operation code is proportional control and integral control. Is set to 0 by. At this time, as shown in the time chart of FIG. 6, the fan speed (air volume) of the convection fan 3 is switched from, for example, 8th speed to 9th speed. Then, one minute after the operation code is set to 0, the convection fan 3 is turned off. And the operation code is 0
Four minutes after being set to, the fan speed of the convection fan 3 is turned on at, for example, 9th speed.

Then, eight minutes after the operation code is set to 0, the zone (see FIG. 3) is determined from the temperature difference between the indoor temperature and the set temperature set by the room temperature setting device 75,
When the determined zone is equal to or less than i, the control at the time of starting the heating operation is performed. Further, when the determined zone is j, the indoor temperature is still higher than the set temperature, so as shown in the time chart of FIG. 7, the convection fan 3 is turned off and the convection fan 3 is turned off after 4 minutes. Turn on the fan speed at 9th speed. Therefore, by repeating this operation until the zone deviates from j, the indoor heat exchanger 5 during the heating operation is
It is possible to prevent the temperature of 1 from excessively rising.

When the determined zone is k, the room temperature is still much higher than the set temperature. Therefore, as shown in the time chart of FIG. 8, the convection fan 3 is turned off and after 10 minutes. The convection fan 3 is turned on at a fan speed of 9th speed. Therefore, by repeating this operation until the zone deviates from j, it is possible to prevent the temperature of the indoor heat exchanger 51 from excessively rising during the heating operation.

As described above, in the air conditioner 1, the convection fan 3 when the floor heating switch 73 is turned on and when the floor heating switch 73 is turned off.
First on time (3 minutes 20 seconds on in this example)
Longer second on time (4 minutes on in this example)
By performing the second operation in which the convection fan 3 is repeatedly turned on and off, the temperature of the indoor heat exchanger 51 is increased even if the gas burner 6 is burning to supply hot water to the floor heater 52 during the second operation. Since it is possible to suppress the excessive rise of
The detection value of the room temperature sensor 74 can be accurately detected.

In the air conditioner 1, the fan speed of the convection fan 3 during the first operation (1 in this embodiment).
By increasing the fan speed (9th speed in this embodiment) of the convection fan 3 during the second operation from 0th speed), the indoor heat exchanger 51 is increased.
Since the temperature around the room temperature sensor 74 attached in the vicinity can be brought closer to the room temperature, the reliability of the detected value of the room temperature becomes high. Further, by increasing the second off time of the convection fan 3 in the second operation longer than the first off time of the convection fan 3 in the first operation, an increase in the room temperature is suppressed during the simultaneous operation of warm air heating and floor heating. You can also

(Modification) In the present embodiment, the hot water is heated by the heat of combustion of the gas burner 6. However, the hot water may be heated by the heat of combustion of the burner burning the liquid fuel or the heat of the electric heater. The hot water may be heated by the heat generated by the operation of the internal combustion engine using the cooling water.

[0036]

According to the present invention, by increasing the second on-time of the convection fan during the second operation from the first on-time of the convection fan during the first operation, the indoor heat exchanger and the floor heater can be connected. Even when the heating means is operated to supply the hot water to the floor heater when supplying the hot water to both, it is possible to prevent the temperature of the indoor heat exchanger from rising more than the indoor temperature. For this reason, the temperature around the room temperature detecting means can be brought closer to the room temperature, and the reliability of the detected value of the room temperature detecting means becomes higher.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control unit of an air conditioner.

FIG. 2 is a schematic diagram showing the overall structure of an air conditioner.

FIG. 3 is an explanatory diagram showing zones with respect to set temperatures.

FIG. 4 is a time chart showing control of a convection fan in a heating operation of a control circuit.

FIG. 5 is a time chart showing the first operation of the control circuit.

FIG. 6 is a time chart showing the control of the convection fan in the heating operation of the control circuit.

FIG. 7 is a time chart showing a second operation of the control circuit.

FIG. 8 is a time chart showing a second operation of the control circuit.

FIG. 9 is a flowchart showing control of a convection fan at the start of heating operation by a control circuit.

FIG. 10 is a flowchart showing control of a convection fan during heating operation control by a control circuit.

[Explanation of symbols]

 1 Air Conditioner (Hot Water Heating Device) 2 Blower Casing 3 Convection Fan 5 Hot Water Circuit 6 Gas Burner (Heating Means) 7 Control Circuit (Control Means) 51 Indoor Heat Exchanger 52 Floor Heater 74 Room Temperature Sensor (Detecting Means)

Claims (1)

[Claims] 1. A blower casing for sending air toward the room; (b) a convection fan for generating an airflow toward the room in the blower casing; and (c) inside the blower casing with hot water. An indoor heat exchanger that heats the air flowing through the room to heat the room, (d) a floor heater that heats the floor with hot water, (e) a heating means that heats the hot water, and (f) heats this heating means. Switching to switch between a first hot water supply path for flowing the heated hot water only to the indoor heat exchanger and a second hot water supply path for flowing the hot water heated by the heating means to both the indoor heat exchanger and the floor heater And (g) a detecting means for detecting an indoor temperature near the indoor heat exchanger, and when the indoor temperature detected by the detecting means is higher than a predetermined temperature, the first hot water supply path is provided. When being replaced, a first operation is performed in which the heating means and the convection fan are repeatedly turned on and off, and when being switched to the second hot water supply passage, the heating means is changed to the floor heater. Hot water having a second operation in which the convection fan is turned on and off for a second on-time that is longer than the first on-time of the convection fan in the first operation. Type heating system.