JP2531876B2 - 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 heating device, and more particularly to a heating device for heating a refrigerant by an external heat source and transporting heat by the refrigerant to perform heating.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a refrigerant circuit of a conventional heating device (hereinafter referred to as a device), FIG. 7 is a diagram showing a relationship between a heating amount and room temperature, and FIG. Figure 7
(B) shows the amount of heating. In FIG. 6, 1 is a compressor, 2 is a radiator provided on the discharge side of the compressor 1, 3 is a heater provided on the suction side of the compressor 1, and the radiator 2 and the heater 3 are The refrigerant circuit 4 is connected by the refrigerant pipe 4 not through the expansion mechanism to form the refrigerant circuit A ₁ . Also,
5 is an accumulator, 6 is a combustor, 7 is a room temperature detector, 8
Is a heating controller.

Next, the operation will be described. In FIG. 6, the refrigerant discharged from the compressor 1 is guided to the radiator 2, and the radiator 2 radiates heat into the air-conditioned room to perform a heating operation, and the refrigerant itself is condensed to become a liquid refrigerant. The liquid refrigerant is guided to the heater 3 without being decompressed, heated by an external heat source such as combustion heat of the combustor 6 and evaporated, and the evaporated refrigerant returns to the compressor 1 through the accumulator 5, and the above cycle The heating performance is maintained repeatedly.

[0004]

Since the conventional heating device is constructed as described above, the heating by the heater is turned on.
By turning off, the heating amount was controlled as shown in FIG. 7 (b), so that the room temperature was largely hunted with respect to the set temperature Ts as shown in FIG. 7 (a), and the user was uncomfortable. Further, there is a problem that the loss due to ON-OFF of heating in the above heater is large.

The present invention has been made in order to solve the above problems and provides a heating device which has less room temperature hunting, does not cause user discomfort, and has a small loss due to ON-OFF of the heater. The purpose is to get.

[0006]

A heating device according to the present invention has an expansion mechanism that includes a radiator that radiates the condensation heat of the refrigerant to the discharge side of the compressor and a heater that heats and evaporates the refrigerant to the suction side. It has a refrigerant circuit that is connected by refrigerant pipes without going through,
Circulate high pressure refrigerant in this refrigerant circuit without depressurizing,
High-temperature high-pressure gas refrigerant vaporized in the heater is sent to the radiator by the compressor, in a heating device for heating by heat dissipation in the radiator, pipe pressure detection means for detecting the outlet pipe pressure of the radiator, Room temperature detecting means for detecting room temperature, room temperature setting means for setting room temperature, and target pipe pressure for setting the target pressure of the outlet piping force from the difference between the room temperature detected by the room temperature detecting means and the room temperature set by the room temperature setting means. Setting means is provided, and heating control means for controlling the heating amount of the heater so as to converge the outlet pipe pressure to the target pipe pressure is provided.

[0007]

In the heating apparatus according to the present invention, the pipe pressure detecting means detects the outlet pipe pressure of the radiator, the room temperature detecting means detects the room temperature, the room temperature setting means sets the room temperature, and the target pipe pressure setting means sets the above-mentioned temperature. The target pressure of the outlet pipe pressure is set according to the difference between the detected room temperature and the set room temperature, and the heating control means controls the heating amount of the heater so that the outlet pipe pressure converges to the target pipe temperature.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram showing the configuration of a heating device according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram showing the heating amount control device of FIG. 1, and FIG. 3 is a flow chart for controlling the operation of this embodiment. FIG. 4 is a graph showing the relationship between the difference between the set temperature and the room temperature and the target pipe pressure, FIG. 5 is a graph showing the relationship between the heating amount and the room temperature in this embodiment, and FIG. (B) shows a heating amount. In the figure, the same or corresponding components as those of the conventional example are designated by the same reference numerals, and the duplicate description will be omitted. In FIG. 1, A ₁ is a refrigerant circuit that includes a radiator 2 that discharges the condensation heat of the refrigerant to the discharge side of the compressor 1 and a heater 3 that heats and evaporates the refrigerant to the suction side without an expansion mechanism. It is configured by connecting with a refrigerant pipe 4, and this refrigerant circuit A ₁
The high-pressure refrigerant is circulated through the heater without depressurizing the heater 3
The high-temperature and high-pressure gas refrigerant vaporized in (1) is sent to the radiator 2 by the compressor 1, and the radiator 2 radiates heat to perform heating. Reference numeral 9 is a room temperature detector including a room temperature detector 9a such as a thermistor for detecting room temperature, 10 is room temperature setting means including a room temperature setting device 10a such as a slide volume, and 11 is a target pipe pressure setting means for detecting room temperature. Based on the difference between the room temperature detected by the means 9 and the room temperature set by the room temperature setting means 10, the target pressure of the outlet pipe pressure is set to the input circuit 12 and the CPU 1.
3. A microcomputer (hereinafter referred to as a microcomputer) 16 including a memory 14, a memory 14, and an output circuit 15 is used for setting. Reference numeral 17 is a pipe pressure detector 17a such as a thermistor, which is a pipe pressure detecting means for detecting the outlet pipe pressure of the radiator 2.
A heating amount control means 8 controls the heating amount of the heater 3 so that the outlet pipe pressure converges to the target pipe pressure, and these room temperature detecting means 9, room temperature setting means 10, and target pipe pressure setting means 1 are provided.
1. Heating amount control device 19 by means of pipe pressure detection means 17 and the like
Is composed. Reference numeral 20 is a circuit including a buffer 20a for executing the heating amount control means 18.

Next, the operation of the embodiment will be described. In FIG. 1, the refrigerant discharged from the compressor 1 is guided to the radiator 2, and the radiator 2 radiates heat into the air-conditioned room to perform a heating operation, and the refrigerant itself is condensed to become a liquid refrigerant. The liquid refrigerant is guided to the heater 3 without being decompressed, is heated by an external heat source such as combustion heat of the combustor 6, and is evaporated,
The evaporated refrigerant returns to the compressor 1 through the accumulator 5. The heating performance is maintained by repeating the above cycle.

Next, the control of the heating amount by the heating amount control means will be described with reference to the flowchart of the figure. The flow starts, the room temperature is set and the room temperature is detected in steps 50 and 51, the difference A between the set temperature and the room temperature is determined in step 52, and the target piping temperature is determined by the difference A according to the relationship shown in the figure. 53, step 58, and step 63, and each step proceeds to step 54, step 59, and step 64, and the target pipe pressure is set to Hkg / cm ² , Mkg / cm ² , Lkg /.
cm ² , step 55, step 60, step 6
Go to each of 5.

Step 55, step 60, step 6
5 detects the pipe pressure, compares the target pipe pressure with the detected pipe pressure in step 56, step 61, and step 67, respectively, and if both pressures are not equal, steps 57, 62, and 67 Step 55, Step 60, Step 6
Returning to step 5, step 56, step 61, step 66, and step 57, step 62, step 67, this cycle is repeated. When the target pipe pressure becomes equal to the detected pipe pressure, the process returns to step 51 and the target pipe pressure is set again, and step 68, that is, the heating amount is controlled until the set temperature and the room temperature become equal (A = 0).

As described above, in this embodiment, when the difference between the room temperature and the set temperature is large, the target pipe pressure is set high, and the heating amount is controlled so that the heating capacity becomes high. As the capacity decreases, the target pipe pressure can be set low and the heating amount can be controlled so as to be reduced. As shown in FIG. 5 (a), there is no room temperature hunting, and as shown in FIG. 5 (b). In addition, since there is no ON-OFF for the heating amount of the heater, ON-OFF loss is reduced.

[0013]

As described above, according to the present invention, the radiator that radiates the heat of condensation of the refrigerant to the discharge side of the compressor and the heater that heats and evaporates the refrigerant to the suction side do not use the expansion mechanism. Has a refrigerant circuit connected by a refrigerant pipe, circulates without depressurizing the high-pressure refrigerant in this refrigerant circuit, sends the high-temperature high-pressure gas refrigerant vaporized in the heater to the radiator by the compressor, In a heating device for heating by heat dissipation from a radiator, a pipe pressure detecting means for detecting the outlet pipe pressure of the radiator, a room temperature detecting means for detecting room temperature, a room temperature setting means for setting room temperature, and the room temperature detecting device. From the difference between the room temperature detected by the means and the room temperature set by the room temperature setting means,
Since the target pipe pressure setting means for setting the target pressure of the outlet pipe pressure is provided, and the heating control means for controlling the heating amount of the heater so as to converge the outlet pipe pressure to the target pipe pressure is provided. , Less hunting at room temperature,
This has the effects of not causing discomfort to the user and of reducing loss due to ON-OFF.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a heating device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing the heating amount control device of FIG.

FIG. 3 is an operation flowchart of the embodiment of the present invention.

FIG. 4 is a graph showing the relationship between the difference between the set temperature and the room temperature and the target pipe pressure according to the present invention.

FIG. 5 is a graph showing the relationship between the heating amount and room temperature in the example of the present invention.

FIG. 6 is an overall configuration diagram showing a conventional heating device.

FIG. 7 is a graph showing a relationship between a conventional heating amount and room temperature.

[Explanation of symbols]

 2 Radiator 3 Heater 9 Room Temperature Detection Means 10 Room Temperature Setting Means 11 Target Pipe Pressure Setting Means 17 Pipe Pressure Detection Means 18 Heating Amount Control Means 19 Heating Amount Control Devices

Claims (1)

(57) [Claims] 1. A refrigerant circuit in which a radiator for radiating the heat of condensation of the refrigerant to the discharge side of the compressor and a heater for heating and evaporating the refrigerant to the suction side are connected by a refrigerant pipe without an expansion mechanism. A heating device that has a high-pressure refrigerant circulated in this refrigerant circuit without depressurizing it, sends the high-temperature high-pressure gas refrigerant vaporized in the heater to the radiator by the compressor, and heats it by radiating heat in the radiator. In, the pipe pressure detecting means for detecting the outlet pipe pressure of the radiator, the room temperature detecting means for detecting the room temperature, the room temperature setting means for setting the room temperature, the room temperature detected by the room temperature detecting means and the setting by the room temperature setting means A target pipe pressure setting means for setting a target pressure of the outlet pipe force from the difference in room temperature is provided, and a heating control means for controlling the heating amount of the heater so that the outlet pipe pressure converges to the target pipe pressure. A heating device characterized by being provided.