JP3900066B2 - Auxiliary heating device in heating system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an auxiliary heating device in a heating system that performs heating with a hydrothermal medium using hot water.
[0002]
[Prior art]
As a heating means for heating the water heating medium, there are an electric heater, an oil and gas burning type, and a heat collecting method using a heat pump cycle. Among them, in a heating system that is also called a heat pump chiller heating system that generates a water heat medium used for heating in a heat pump cycle and sends water to an indoor radiator to perform heating, the amount of heat that can be collected in the heat pump cycle is the outside air temperature. Therefore, when the outside air temperature is low, the heating capacity is lowered and it becomes difficult to obtain the required heating atmosphere. This shortage of heat sources can be solved by providing a PTC heater in the refrigerant passage of the indoor heat exchanger or the water pipe connected to the indoor heat exchanger, or providing an auxiliary heating device with a ceramic heater in the water flow path. (For example, see Patent Document 1 and Patent Document 2). As another means, an electric heater is built in the heat pump heat source machine, and auxiliary heating is performed when the capacity of the heat pump is insufficient.
[0003]
[Patent Document 1]
JP-A-61-250462 (pages 2 to 3, FIGS. 2 and 6)
[Patent Document 2]
Japanese Patent Laid-Open No. 11-170846
[Problems to be solved by the invention]
In the above-described conventional heat pump heater, since the PTC heater operates independently of the heat pump refrigerant cycle, the PTC heater operates at the start of heating even when there is sufficient capacity on the refrigerant cycle side. The running cost has soared. In addition, it is known that the efficiency of the heat pump is increased by lowering the temperature of the generated hot water. However, in the conventional technology, even when the heating load is small and sufficient heating can be performed with low-temperature water, the predetermined water temperature The water temperature must be increased by the PTC heater until the temperature reaches the value, and the efficiency is poor. In addition, when the heater is built in the heat pump heat source machine, the control of the heater is easy, but the structure of the heat pump heat source machine is complicated and the electric capacity is increased, so the workability and maintainability are poor and the cost is high. There is a problem.
[0005]
On the other hand, in a heating system with a heat source that burns fossil fuels such as electric heaters and oil / gas, the heat source does not cause a shortage of capacity due to a decrease in outside air temperature, etc. When the load increases due to expansion or renovation of a house and exceeds the capacity of the heat source machine, the shortage of capacity cannot be easily compensated, and it must be replaced with a heat source machine suitable for the capacity.
[0006]
The present invention has been made in order to solve the conventional problems, and an object of the present invention is to provide an auxiliary heating device in a heating system that can easily realize a shortage of capacity due to an increase in heating load. In addition to improving the workability and maintainability of the auxiliary heating device, it is intended to reduce the size and cost.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to an auxiliary heating device for assisting the heating capability of the main heat source unit in a heating system using hot water composed of a heat source unit and one or a plurality of radiators. An electric heating means connected to the outer periphery of a heat-conductive conduit having an inlet-side connection port and an outlet-side connection port that can be connected in the middle of a radiator pipe by a bonding material made of a good thermal conductor, and a U-shaped connection tube only more pieces set along the conduit using a plurality pieces of electrical heating means connected by a fixed part made of a good heat conductor, set the temperature fuse and the automatic return type automatic cutting as overtemperature suppression means to the fixed part Adopting means that uses the automatic return type automatic cut as a control means for controlling the water temperature of the auxiliary heating device .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment shown in FIG. 1 to FIG. 10 performs cooling and heating by a heat source side heat medium cycle constituted by a heat source unit 1 that generates and conveys a water heat medium such as an antifreeze liquid and the water heat medium supplied thereby. It is related with the heating system comprised by the utilization side cycle comprised with the indoor heat radiator to perform. As shown in FIG. 1, the heat source unit 1 includes a buffer tank 2 that stores a water heat medium, a circulation pump 3 that circulates the water heat medium in the buffer tank 2, and a heat exchanger 4 that converts the water heat medium into a heat exchanger 4. And a heat pump type refrigeration cycle that heats or cools through.
[0009]
The buffer tank 2 is provided with a forward connection port and a return connection port. The forward connection port is connected to the suction side of the circulation pump 3, and the return connection port is used for heat collection. The outlet side of the pipe connected in series to the secondary flow path of the exchanger 4 is connected. On the discharge side of the circulation pump 3, the outgoing side pipe of the usage side cycle is connected, and on the inlet side of the secondary flow path of the heat exchanger 4, the return side pipe of the usage side cycle is connected. The refrigeration cycle by the heat pump is a heat medium circulation closed circuit composed of one or a plurality of outdoor heat exchangers 5, a four-way switching valve, a compressor, a flow control valve, and a primary flow path of the heat exchanger 4. The refrigerant and the hydrothermal medium are independent of each other and do not mix with each other, but are thermally connected by the heat exchanger 4. The heat source unit 1 operates with its own power source 6, and at least the outdoor heat exchanger 5 is installed outdoors.
[0010]
The utilization side cycle is configured as a circulation system of a water heat medium by an indoor radiator connected to a main pipe 7 by a forward pipe and a return pipe by a branch pipe 8. As the indoor radiator, one or a plurality of fan coil units 9 for cooling and heating that perform cooling or heating while circulating indoor air to perform cooling or heating, or a heating dedicated floor that performs heating function by radiation or natural convection A heating panel 10 and a panel heater 11 are connected. Auxiliary heat source heating means 12 as a hot water generator is connected to the outward piping of the main piping 7 to which an indoor radiator dedicated for heating is connected. In the system in which the auxiliary heat source heating means 12 is operated by a power source 13 different from that of the heat source unit 1 and an indoor radiator that is also used for cooling and heating such as the fan coil unit 9 is installed, the auxiliary heat source heating means 12 is electromagnetically disposed downstream of the fan coil unit 9. One or a plurality of machines are arranged through the valve 14 or the thermal valve according to the capacity.
[0011]
As shown in FIG. 2, the heat source unit 1 is equipped with a control unit 15 including a microcomputer for controlling the circulation pump 3, the compressor, and the auxiliary heat source heating unit 12. The control unit 15 includes a cooling mode and a heating mode. A controller having a setting switch for setting the above, a display unit for displaying an operation state or the like by an LED, a liquid crystal, or the like, and the auxiliary heat source heating unit 12 are connected to each other through a signal line so as to be able to exchange signals. The control means 15 takes in the output of the heat medium temperature detecting means for detecting the temperature of the hydrothermal medium at the outlet of the buffer tank 2 and the output of the outside air temperature detecting means for detecting the outdoor temperature as control information.
[0012]
Also, the indoor radiator is equipped with a controller and a room temperature detecting means for detecting the room temperature. By operating the controller, the flow rate control valve provided in the hydrothermal medium is moved so that the room temperature becomes the set temperature. In addition to performing feedback control, the operation information, the set temperature, and the room temperature are transmitted as control information to the control means 15 of the heat source unit 1.
[0013]
When the heating mode is set by the controller of the heat source device 1, the control means 15 switches the refrigeration cycle of the heat pump to the heating cycle, and takes in the operation information from the controller of the indoor radiator. When an operation request signal is input from any of the indoor radiators, the heat source unit 1 is controlled so that the temperature of the hydrothermal medium sent to the use-side cycle becomes a temperature at which heating is possible. When the temperature of the water heating medium does not reach a temperature at which heating is possible, the control means 15 sends a control signal for closing the contact 16 shown in FIG. When this contact 16 is closed, the relay coil of the relay 18 connected to the electric heater 17 of the auxiliary heat source heating means 12 is excited, the normally open contact 19 becomes a closed contact, and the power source 13 and the electric heater 17 are connected, so that the auxiliary heat source is used. The heating means 12 operates to raise the temperature of the hydrothermal medium. In addition, when there is no operation request signal from the indoor radiator side, the circulation pump 3 is stopped.
[0014]
As shown in FIGS. 3 to 5, the auxiliary heat source heating means 12 includes an inlet side connection port 20 connected to the outgoing pipe of the main pipe 7 constituting the use side cycle, and an outlet side connection port 21 connected to the return pipe. The electric heater 17 is integrally coupled to the outer periphery of the heat-conducting conduit 22 provided by a bonding material 23 made of a good heat conductor such as aluminum, and the entire structure excluding the inlet side connection port 20 and the outlet side connection port 21 It is housed in a box-shaped outer shell 24. The inlet side connection port 20 and the outlet side connection port 21 are connected to the main body of the conduit 22 through a connection pipe 22a. The connecting pipe 22a is made of, for example, a rubber material that has heat shielding properties and flexibility. The conduit 22 may be one, but it may be a two-wire configuration in which two are connected by a U-shaped tube 25 as shown in FIG. 5 or a configuration of three or more configurations, which are connected in series according to the required capacity. The outer shell 24 is sandwiched in the outer shell 24 by a heat insulating material 26 provided on the back side, front side, and both side surfaces, without using any special fixing means, and is placed in a restrained state.
[0015]
The inlet-side connection port 20 and the outlet-side connection port 21 of the conduit 22 are drawn out from the outer shell 24 or a connection plate 27 that forms the lower surface of the outer shell 24. The drawing direction of the inlet side connection port 20 and the outlet side connection port 21 is connected to the outer shell 24 in a parallel direction (FIG. 7) from the connection plate 27 according to the drawing position of the external pipe by the flexible connecting pipe 22a. A direction perpendicular to the plate 27 (FIG. 8) and a straight line from the outer shell 24 (FIG. 9) can be freely selected. In addition, since the connection pipe 22a has a thermal barrier property, the temperature increase of the inlet side connection port 20 and the outlet side connection port 21 is suppressed, and heat loss due to heat radiation, the connection plate 27, and the like may be overheated. Is prevented.
[0016]
The electric heaters 17 of the two conduits 22 are arranged so as to be vertically symmetrical, and a heater mounting plate 28 having high heat conductivity is mounted on the front side so as to straddle the electric heater 17, and the temperature is centered on the heater mounting plate 28. A thermal fuse 29 as an excessive temperature rise suppression means and an automatic return type automatic cut 30 are attached. Three or more temperature overheating suppression means may be provided. The thermal fuse 29 and the auto-cut 30 sense the heat of the heater mounting plate 28 and cut off the energization to the electric heater 17 for excessive heat generation, and are arranged at the center of the heater mounting plate 28. It becomes possible to function regardless of the water flow direction, and there is no need to distinguish between the inlet side connection port 20 and the outlet side connection port 21. Further, the automatic return type automatic cut 30 may be a control means for controlling the water temperature of the auxiliary heat source heating means 12.
[0017]
A partition plate 31 is stacked on the heat insulating material 26 on the front side, and electrical components such as an earth leakage circuit breaker 32, a relay 18, and a display lamp 33 are attached to the partition plate 31. By partitioning the electrical components with the outer shell 24 having a hierarchical structure with the heat insulating material 26 and the partition plate 31, even when water leaks from the conduit 22 system and scatters, the electrical components do not leak due to a hydrothermal medium. In the unlikely event that a leakage occurs, the leakage breaker 32 cuts off the power supply to the electric heater 17.
[0018]
The front side of the partition plate 31 is covered with a detachable front plate 34 that is spaced from the partition plate 31. By removing the front plate 34, electrical wiring and internal components can be maintained. An attachment flange 36 is provided on the connection plate 27 and the upper surface plate 35 that constitute the upper and lower surfaces of the outer shell 24, and the attachment flange 36 is screwed to a wall surface or the like.
[0019]
In this auxiliary heat source heating means 12, since the water heating medium and the electric heater 17 are not in direct contact with each other, it is possible to avoid a decrease in heat generation efficiency due to corrosion of the electric heater 17 and adhesion of components contained in the water heating medium. Since the resistance is small, the flow rate drop of the heating system is extremely small.
[0020]
Further, by restraining and fixing the electric heater 17 and the conduit 22 with the heat insulating material 26, a special member necessary for fixing is not required, and the cost can be reduced. It is possible to improve the heat medium heating efficiency by suppressing the increase in the outer shell temperature and the heat dissipation loss due to the heat transfer. When a plurality of electric heaters 17 are provided, the electric heaters 17 are arranged vertically symmetrically and connected by a heater mounting plate 28 made of a good thermal conductor, and the heater mounting plate 28 is provided with an overheat suppression means comprising a thermal fuse 29 and an auto cut 30. By providing two or more, it is not necessary to provide an overheat suppression means for each of the electric heaters 17 and the cost can be reduced, and the reliability of overtemperature suppression against excessive heat generation is increased.
[0021]
The inlet side connection port 20 and the outlet side connection port 21 of the conduit 22 are not fixed, and either may be connected to the forward pipe or the return pipe, and the degree of freedom of piping when configuring the heating system is high. The front side of the partition plate 31 is covered with a detachable front plate 34 that is spaced from the partition plate 31, and by removing the front plate 34, maintenance of electrical wiring and internal components is possible. Good maintainability.
[0022]
Regarding installation, in addition to the method of screw-fixing to a wall surface or the like, as shown in FIG. In any case, the inlet side connection port 20 and the outlet side connection port 21 can be parallel to each other as shown in FIGS. The degree of freedom of construction is high.
[0023]
This auxiliary heat source heating means 12 is a heating system that uses a heat source that burns fossil fuel such as an electric heater or oil / gas, and the load increases due to the addition of a radiator or expansion / renovation of a house. Even if the capacity is exceeded, simply connecting the conduit 22 to the main pipe 7 can easily compensate for the lack of capacity, eliminating the inconvenience of having to replace the original heat source unit with one that matches the capacity. can do.
[0024]
Thus, in this heating system, not only the outside air temperature is extremely low and the heat collection by the heat pump is not effective, but also the compressor is damaged by the operation, the auxiliary heat source heating means 12 is effectively used for compression. Comfortable heating by the auxiliary heat source heating means 12 can be performed at a low running cost after avoiding damage to the machine. By adopting a configuration in which the auxiliary heat source heating means 12 is provided on the downstream (exit) side of the heat source unit 1, the heating capacity and the backup function can be improved without causing deterioration of the efficiency of the heat pump.
[0025]
By making the auxiliary heat source heating means 12 separate from the heat source unit 1 and also by making the power source 13 separate from the power source 6 of the heat source unit 1, the heat source unit 1 can be reduced in size and the capacity of each device can be reduced. Therefore, workability is also improved. By using the operation signal of the auxiliary heat source heating means 12 as a contact signal, the driving device of the auxiliary heat source heating means 12 can be simplified, and the cost of the apparatus can be reduced.
[0026]
【The invention's effect】
According to the present invention, it is possible to obtain an auxiliary heating device in a heating system that can easily and inexpensively complement the lack of capacity due to an increase in heating load.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram illustrating a heating system according to an embodiment.
FIG. 2 is a block configuration diagram of a control system in the heating system of the embodiment.
FIG. 3 is a perspective view showing heating means for an auxiliary heat source in the heating system according to the embodiment.
FIG. 4 is an exploded perspective view of heating means for an auxiliary heat source in the heating system according to the embodiment.
FIG. 5 is a perspective view of the main part of the heating means for the auxiliary heat source in the heating system of the embodiment.
FIG. 6 is a perspective view showing another installation mode of the heating means for the auxiliary heat source in the heating system of the embodiment.
FIG. 7 is a perspective view showing another installation mode of the heating means for the auxiliary heat source in the heating system of the embodiment.
FIG. 8 is a perspective view showing another installation mode of the heating means for the auxiliary heat source in the heating system of the embodiment.
FIG. 9 is a perspective view showing another installation mode of the heating means for the auxiliary heat source in the heating system of the embodiment.
FIG. 10 is a perspective view showing another installation mode of the heating means for the auxiliary heat source in the heating system of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat source machine, 4 Heat exchanger, 6 Power supply, 7 Main piping, 9 Fan coil unit, 11 Panel heater, 12 Heating means for auxiliary heat sources, 13 Power supply, 17 Electric heater, 18 Relay, 19 Normally open contact, 20 Inlet side Connection port, 21 outlet side connection port, 22 conduit, 22 23 binding material, 24a connection pipe, outer shell, 26 heat insulating material.

Claims (2)

An auxiliary heating device that assists the heating capability of the main heat source unit in a heating system using hot water composed of a heat source unit and one or more radiators, and can be connected in the middle of the piping of the heat source unit and the radiator Electric heating means joined by a bonding material made of a good thermal conductor to the outer periphery of a heat conductive conduit having an inlet side connection port and an outlet side connection port along the conduit using a U-shaped connection pipe only more pieces set, the plurality pieces of electrical heating means connected by a fixed part made of a good heat conductor, set only a thermal fuse and automatic return type automatic cutting as overtemperature suppression means to the fixed part, the automatic recovery An auxiliary heating device in a heating system using the automatic cut as a control means for controlling the water temperature of the auxiliary heating device. The auxiliary heating device for a heating system according to claim 1, wherein a plurality of electric heating means are arranged so as to be vertically symmetrical and connected by a fixed part, and an overheat suppression means is provided at the center of the fixed part. provided, the auxiliary heating device in the heating system to function regardless of the overtemperature suppressing means water passing direction to the conduit.

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