JPS59137733A - Space heater utilizing heated medium - Google Patents

Abstract

PURPOSE:To surely prevent heat medium and lubricating oil from deteriorating by detecting the temperature of the medium correctly, by controlling a burning state of a burner based on the temperature of medium detected by a temperature detector touching only to the wall of the pipe of a medium duct in the inside of a housing part of a heat radiating plate. CONSTITUTION:A temperature detector 21 is arranged within an insertion hole 9 of a heat radiating plate 4 of a heat exchanger 3 heated by a medium, and is mounted in the state touching only to the wall of the pipe of a medium duct 5 equipped within the housing part 8 of the radiating plate 4. In addition to the above, the temperature detector 21 is formed of a copper pipe 22, a detecting element 23 provided within the copper pipe 22 and a spring 24, and the detecting element 23 is held in a state pressed against the wall side of the pipe of the medium duct 5 by the spring. The temperature detector 21 is connected with a control part 25. The control part 25 is a part controlling the burning state of a burner 10 by making opening and closing control of a control valve 14 based on a medium temperature detected by the temperature detector 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a refrigerant heating and heating apparatus equipped with a refrigerant heating heat exchanger that is heated by a burner during heating operation.

[Technical background of the invention]

FIG. 1 shows a schematic configuration of the entire refrigerant heating and heating system, where 1 is a compressor and 2 is an indoor heat exchanger.

3 is a refrigerant heating heat exchanger. These compressor 1, indoor heat exchanger 2, and refrigerant heating heat exchanger 3 are sequentially connected via piping for refrigerant distribution, and the indoor heat exchanger 2 is connected to the condenser and the refrigerant heating heat exchanger 3 A heating circuit is formed, each of which functions as an evaporator. As shown in FIG. 2, the refrigerant heating heat exchanger 3 has a main body 6 formed of a heat sink 4 and a refrigerant flow pipe 5. This heat dissipation plate 4 has a large number of fins 7 protruding from it, and is also provided with an accommodating portion 8 for accommodating the refrigerant flow pipe 5, and is integrally formed by extrusion molding. This accommodating portion 8 is approximately annular, and an insertion hole 9 consisting of a notch is provided on its outer periphery. When assembling the main body 6, the refrigerant flow pipe 5 is inserted through the insertion hole 9 of the heat sink 4, and the housing part 8
It is designed to be installed inside. Further, a burner 10 is disposed below the fins 7 of the refrigerant heating heat exchanger 3, and the refrigerant heating heat exchanger 3 is heated by the burner 10 during heating operation.

By the way, in this type of refrigerant heating and heating apparatus, a temperature detector 1 for detecting the refrigerant temperature is conventionally provided in the piping on the refrigerant outlet side of the refrigerant heating heat exchanger 3, and the output from the temperature detector 11 is A control section 12 is provided that controls the combustion state of the burner 10 based on the signal. As shown in FIG. 3, this control unit 12 has a lower limit temperature Tl
The fuel supply pipe 13 is connected to the burner 10 based on the refrigerant temperature detected by the temperature detector 11 during heating operation.
The on-off valve 14 is controlled to open and close, and the refrigerant temperature reaches the upper limit temperature T2.
The burner 10 is kept in the on state or the combustion state is kept in the strong state until the refrigerant temperature reaches the upper limit temperature T2, and the burner 10 is turned off or the combustion state is switched to the weak state until the refrigerant temperature reaches the lower limit temperature. When T1 is reached, control is performed to turn on the burner 10 again and switch the combustion state to a strong state.

[Problems with background technology]

The refrigerant temperature detected by the temperature detector 11 during heating operation (indicated by the dotted line A in FIG. 3) and the pipe wall temperature of the refrigerant flow pipe 5 of the refrigerant heating heat exchanger 3 (indicated by the solid line B in FIG. 3) ), there is a temperature difference between υ and
After the heating operation is started, the refrigerant temperature A detected by the temperature detector 11 reaches the upper limit temperature Tg, and at the time when the combustion state of the burner 10 is switched, the pipe wall temperature B of the refrigerant flow pipe 5 is reached.
There was a problem that the refrigerant reached a temperature T3 higher than the upper limit temperature T2.

Therefore, even if the temperature detector 11 detects that the refrigerant temperature A at the refrigerant outlet has reached the upper limit temperature T2 and the combustion state of the burner 10 is switched, the refrigerant is is heated, and the maximum value T, / of the refrigerant temperature A at the refrigerant outlet becomes higher than the upper limit temperature T3 by ΔTA, so the temperature of the refrigerant in the refrigerant flow pipe 5 cannot be suppressed to within the upper limit temperature 12, There is a problem in that the refrigerant flowing in the refrigerant flow pipe 5 and the lubricating oil circulating together with the refrigerant deteriorate, resulting in poor durability. Also,
If refrigerant leaks from the refrigerant flow pipe 5 of the refrigerant heating heat exchanger 3, the main body 6 will be overheated by the heat of the burner 10, and even if the temperature of the refrigerant in the refrigerant flow pipe 5 rises, the refrigerant at the refrigerant outlet will not flow. Since the temperature A does not rise easily, there is a problem in that the temperature detector 11 at the refrigerant outlet cannot detect overheating of the main body 6. Therefore, as shown in FIG.
A temperature detector 15 for overheating prevention is provided separately from the temperature detector 11 at the refrigerant outlet, and as shown by the solid line in FIG. Since the burner 1θ was turned off and the operation of the compressor 1 was stopped at the time when the temperature was detected by the temperature detector 15, there was a problem of high costs.

[Purpose of the invention]

This invention can accurately detect the temperature of the refrigerant flowing in the refrigerant flow pipe of a refrigerant heating heat exchanger, reliably prevent deterioration of the refrigerant and lubricating oil, improve durability, and reduce costs. It is an object of the present invention to provide a refrigerant heating and heating device that can reduce the amount of water used.

[Summary of the invention]

A temperature sensor is provided that contacts only the pipe wall of the refrigerant flow pipe in the housing part of the heat sink through the insertion hole of the heat sink of the refrigerant heating heat exchanger, and based on the refrigerant temperature detected by this temperature sensor, A control means for controlling the combustion state of the burner is provided.

[Embodiment of the Invention] Figures 5 to 7 show an embodiment of the invention. Note that the same parts in FIGS. 5 and 6 as in FIGS. 1 and 2 are given the same reference numerals, and the explanation thereof will be omitted. In FIGS. 5 and 6, 21 is a temperature detector. This temperature sensor 21 is arranged in the insertion hole 9 of the heat sink 4 of the refrigerant heating heat exchanger 3, and is in contact only with the pipe wall of the refrigerant flow pipe 5 installed in the housing part 8 of the heat sink 4. It is installed in Furthermore, this temperature sensor 21 is formed from a detection element 23 and a spring 24 arranged in a copper pipe f22 with a copper mother wire °22. It is held pressed against the pipe wall side. Further, this temperature detector 21 is connected to a control section (control means) 25. The control section 25 controls the opening and closing of the on-off valve 14 based on the refrigerant temperature detected by the temperature detector 21 to control the combustion state of the burner 1o. That is, this control unit 25 has a lower limit temperature T1 and an upper limit temperature (first set temperature) Tg of the refrigerant temperature in the refrigerant flow pipe 5 during normal heating operation, as well as an overheating prevention temperature higher than this upper limit temperature T2. (Second set temperature) Ta is set, and during normal heating operation, the refrigerant temperature in the refrigerant flow pipe 5 is detected by the temperature detector 21 after the start of operation, as shown by the solid line in FIG. The burner 10 is kept on or in a strong combustion state until M reaches the upper limit temperature T2, and when the refrigerant temperature M reaches the upper limit temperature T2, the burner 10 is turned off or the combustion state is switched to a weak state. Further, when the refrigerant temperature M reaches the lower limit temperature, the burner 10 is turned on again or the combustion state is switched to the strong state, and control is performed to maintain the refrigerant temperature M within the range between the upper limit temperature T2 and the lower limit temperature Tl. It looks like this. In addition, in the event of an abnormality such as when refrigerant leaks from the refrigerant flow pipe 5 of the refrigerant heating heat exchanger 3, the refrigerant temperature N detected by the temperature detector 21 reaches the upper limit temperature T2 as shown by the dotted line in FIG. When the burner 10 reaches the OFF state or the weak combustion state, and if the refrigerant temperature N further rises due to heat conduction from the heat sink 4 and the refrigerant flow pipe 5, the refrigerant temperature N has reached the superheat prevention temperature T3. At this point (if the burner 10 is in a weak combustion state), control is performed to turn off the burner 10 and stop the operation of the compressor 1.

Therefore, in the above configuration, the temperature detector 21 is installed in a state in which it is in contact with only the refrigerant flow pipe 5, so there is no risk that the heat of the heat sink 4 will be directly transmitted to the temperature sensor 21, and the refrigerant flow The temperature of the refrigerant in the tube 5 can be accurately detected by the temperature detector 21. Therefore, when the temperature detector 21 detects that the refrigerant temperature has reached the upper limit temperature T2 and the combustion state of the burner 10 is switched, the temperature difference between the upper limit temperature T2 and the maximum value T2' of the refrigerant temperature is The maximum value of refrigerant temperature T
2/ is the maximum allowable temperature of the pipe wall of the refrigerant flow pipe 5 (approximately 120°C
) by setting the upper limit temperature T2 so as not to exceed 9
- It is possible to reliably suppress the pipe wall temperature of the refrigerant flow pipe 5 within the maximum allowable temperature. Therefore, deterioration of the refrigerant and lubricating oil flowing within the refrigerant flow pipe 5 can be prevented, and durability can be improved. In addition, in the event of an abnormality such as a refrigerant leak, the heat dissipation plate 4
Since the heat from the side is quickly transferred to the temperature detector 21 via the refrigerant flow pipe 5, overheating of the main body 6 of the refrigerant heating heat exchanger 3 can be reliably detected by the temperature detector 21. Therefore, there is no need to specifically provide a temperature detector for overheating prevention as in the past, and costs can be reduced compared to the past.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

According to the present invention, a temperature sensor is provided that contacts only the refrigerant flow pipe in the housing portion of the heat sink through the insertion hole of the heat sink of the refrigerant heating heat exchanger, and the temperature sensor detects Since the control means is provided to control the combustion state of the burner based on the refrigerant temperature, the temperature of the refrigerant flowing in the refrigerant flow pipe of the refrigerant heating heat exchanger can be accurately detected, and the refrigerant and lubricating oil temperature can be accurately detected. deterioration can be reliably prevented, durability can be improved, and costs can be reduced.

[Brief explanation of drawings]

Figures 1 to 4 show a conventional example, where Figure 1 is a schematic diagram of the overall configuration, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view taken along the line
The figure is a characteristic diagram showing the refrigerant temperature at the refrigerant outlet and the temperature change of the pipe wall of the refrigerant flow pipe. 5
Figures 7 to 7 show one embodiment of the present invention.
6 is a sectional view taken along the line ■--■ in FIG. 5, and FIG. 7 is a characteristic diagram showing changes in refrigerant temperature within the refrigerant flow pipe during normal and abnormal times. 3... Refrigerant heating heat exchanger, 4... Heat sink, 5...
Refrigerant flow pipe, 6... Main body, 8... Accommodation part, 9...
Insertion hole, 10...Burner, 21...Temperature detector, 2
5...Control unit (control means). Applicant's representative Patent attorney Suzue Takehikoga 4L paharu Sabaga 5zu Yu C) 〒ku;fu,,■21 3 ■1; 1 1 gu=;
♀）≦L2 1 1 1 11 Fang 6 figure Fang 7 figure 1 1 1 convex 11j dark
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Claims (2)

[Claims] (1) The main body of the refrigerant heating heat converter is formed by a heat dissipation plate in which a housing section is formed that communicates with the insertion hole, and a refrigerant flow pipe inserted through the insertion hole of the heat dissipation plate and installed in the housing section. In a refrigerant heating and heating device in which the main body is heated by a burner during operation, a temperature sensor is provided that contacts only the pipe wall of the refrigerant flow pipe through an insertion hole of the heat sink, and the temperature sensor is detected by the temperature sensor. A refrigerant heating and heating apparatus characterized in that a control means is provided for controlling a combustion state of the burner based on a refrigerant temperature in the refrigerant flow pipe. (2) A patent claim characterized in that the control means has a function of stopping the heating operation when the temperature of the refrigerant in the refrigerant flow pipe as detected by the temperature detector reaches a set temperature for overheating prevention. A refrigerant heating and heating device according to item (1).