JPH01210728A - Hot water heater - Google Patents

Abstract

PURPOSE:To control an interior part so as to get a comfortable condition by a method wherein an indoor machine is kept at a rated capability with rated values of a pressure and a flow rate within a heat exchanger irrespective of an installing condition. CONSTITUTION:A pressure sensing means 3b is arranged at a hot water inlet port of an indoor machine 3 and a hot water flow rate controlling valve 3a is arranged at one end of a heat exchanger 3a of the indoor machine 3. A pressure value sensed by the pressure sensing means 3b is inputted to a valve driving and controlling means 3e. The opening or closing of the valve 3a is controlled under a predetermined state in response to the sensed pressure. As a result, even in a case in which lengths of pipings 2 and 4 for circulating from an outdoor machine 1 to the indoor machine 3 are different to each other, it is possible to make rated values of a pressure and a flow rate of hot water within the heat exchanger 3a without being affected by the pipings 2 and 4 and further to keep and indoor temperature at a predetermined value.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot water heater consisting of an indoor unit and an outdoor unit, and more specifically relates to a method for controlling the pressure and flow rate of hot water circulated to the heat exchanger of the indoor unit. This invention relates to a hot water heater that is controlled to maintain the rated capacity of an indoor unit.

[Conventional Example] Conventionally, this type of hot water heater has a configuration shown in FIG. 5, for example.

In the figure, hot water obtained from the boiler 1a of the outdoor unit 1 is sent to the indoor unit 3 side via the piping 2 by the pump 1b.
It is circulated to the heat exchanger 3a of the indoor unit 3. The hot water that has circulated through the heat exchanger 3a warms the room in which the indoor unit 3 is installed, and its temperature is lowered. This reduced hot water is circulated again to the outdoor unit 1 side via piping 4,
For example, it is heated in the boiler section 1a. In this way, hot water is circulated from the outdoor unit 1 side to the indoor unit 3 side, and the indoor unit 3
The room where it is installed is maintained at a predetermined temperature to maintain a comfortable environment.

[Problems to be Solved by the Invention] Incidentally, in the above hot water heater, the outdoor unit 1 and the indoor unit 3 are separated from each other due to problems such as noise, and are connected by pipes 2 and 4. Therefore, depending on where the hot water heater is installed, the pipes 2 and 4 connecting the outdoor unit 1 and the indoor unit 3 may become too short. In that case, the water flow resistance of the pipes 2 and 4 will be small, so
The output of the pump 1b follows the pressure/flow rate characteristic curve T (shown in FIG. 4) as the flow rate of hot water increases and its pressure decreases. That is, the hot water flow rate in the heat exchanger 3a of the indoor unit 3 becomes larger than the rated value Q0, and the pressure thereof becomes the rated value P.
If it becomes smaller than 0 (in the case according to the broken line curve in the figure), the rated capacity (P,,Ql,) of the heat exchanger 3a cannot be maintained, and there is a problem that the indoor temperature cannot be comfortably controlled. Ta.

In other words, since the rated capacity of the outdoor unit's pump 1b depends on the length of its piping and operates according to the pressure/flow characteristic curve T, the hot water flow rate and pressure in the indoor unit's heat exchanger 3a will differ, making handling difficult. This invention was made in view of the above problems, and its purpose is to improve the pressure and flow rate inside the heat exchanger regardless of the installation conditions. To provide a hot water heater capable of maintaining an indoor unit at its rated capacity with the rated value and controlling the indoor temperature to a comfortable temperature.

[Means for Solving the Problem] In order to achieve the above object, the hot water heater of the present invention has the following features:
A hot water heater consisting of an outdoor unit and an indoor unit, comprising a pressure detection means provided at a hot water input port of a heat exchanger of the indoor unit to detect the pressure of hot water circulated from the outdoor unit, and the heat exchanger. comprising a valve provided at one end and controlling the flow rate of the circulated hot water; and a valve drive control means controlling opening and closing of the valve according to the pressure detected by the pressure detection means,
The pressure and flow rate of hot water circulated through the heat exchanger are controlled to a rated value.

[Function] In the above configuration, the pressure detection means detects the pressure of hot water sent to the indoor unit, and when this detection becomes less than the reference pressure (rated value), the valve drive control means closes the valve. When the detected pressure reaches the reference pressure, the valve is stopped. That is, when the connecting piping between the outdoor unit and the indoor unit is short, for example, the piping resistance becomes small, the flow rate of hot water sent out from the pump of the outdoor unit increases, and the pressure thereof becomes small. In this case, closing the valve produces the same effect as when piping resistance is large. As a result, the flow rate of hot water sent out from the pump decreases, its pressure increases, and the inside of the heat exchanger of the indoor unit is maintained at the rated value (flow rate, pressure).

[Example] Hereinafter, an example of the present invention will be described based on the drawings. Note that the same parts as in FIGS. 1 and 5 are given the same reference numerals, and redundant explanation will be omitted.

In the figure, pressure detection means 3 is installed at the hot water input port of the indoor unit 3.
b is disposed, and a valve 3C is disposed at one end of the heat exchanger 3a of the indoor unit 3. The pressure detection means 3b is disposed on the side surface of the pipe 3d, for example, as shown in FIG. 2, and is a pressure sensor of a diffusion type semiconductor element that utilizes a piezoresistance effect. The pressure value detected by the pressure detection means 3b is input to the valve drive control means 3e. This valve drive control means 3e
As shown in Fig. 3, the pressure inside the heat exchanger 3a is
A reference pressure setting device 3e1 in which a reference value (rated value P0: see FIG. 4) is set; a comparison circuit 3e2 that compares this reference value with the pressure value detected by the pressure detection means; and a comparison result. A drive unit 3e, a motor 3e4 (drive device), etc. are provided to control the opening and closing of the valve in a predetermined manner according to the conditions. When the comparator circuit 3e is a non-inverting amplifier circuit, the drive unit 3e is turned on by the H level output of the inverter circuit 3e, 1 which inverts the signal from the comparator circuit 3e2. Transistor 3
e, 2, consisting of a relay circuit 3833, etc., which is driven when the transistors 3e, 2 are turned on, and this relay circuit 3e
The internal switch is turned on by the operation of 33, and the motor 3e
, the voltage of the power source 3e is applied.

Next, the operation of the hot water heater having the above configuration will be explained based on the pressure/flow characteristic diagram shown in FIG. 4.

First, depending on the settings of the hot water heater, pump 1 of outdoor unit 1
b is operated at the rated capacity, and hot water obtained in the boiler section 1a is circulated from the outdoor unit 1 side to the indoor unit 3 side. At this time, in order to maintain the indoor temperature at a temperature according to the setting, the hot water flow rate and pressure in the heat exchanger 3a of the indoor unit 3 are Qo (Q/m1n), P, (kg/rf) (rated value). Suppose there is. In other words, the outdoor unit 1 and indoor unit 3
The resistance characteristics within the pipes 2 and 4 connecting these are shown by the dashed-dotted curve in FIG. In this way, when the outdoor unit 1 and the indoor unit 3 are arranged within the rating of the hot water heater, and the piping 2 and 4 are of regular length, the rated capacity of the pump 1b is determined by the pressure/flow characteristic curve T. Therefore, hot water is circulated through the heat exchanger 3a at a substantially rated flow rate Q and pressure P0.

By the way, if the pipes 2 and 4 are arranged shorter than in the normal case, the resistance of the pipes becomes smaller (the fourth
(see the broken line curve in the figure), the hot water from the pump 1b has a large flow rate and its pressure decreases according to the above pressure/flow characteristic curve T, and the hot water in the heat exchanger 3a has a large flow rate Q, and its pressure It becomes small as P-engine.

Then, the pressure P□ is detected by the pressure detecting means 3b, and the pressure P is compared with a reference value P0 preset by the reference pressure setting device 3e□ in the comparison circuit 3e2. As a result of this comparison, an L level signal is output from the comparison circuit 3e, so that the transistor 3e32 is turned on and the switch of the relay circuit 3e33 is turned on. As a result, the motor 3e4 is driven, and the rotation of the motor 3e4 gradually closes the valve 3C. As a result, the hot water sent from the outdoor unit 1 is subjected to resistance, so the output of the pump 1b follows the pressure/flow characteristic curve T, where the hot water flow rate is small, the pressure increases, and the hot water in the heat exchanger 3a gradually increases. As the flow rate decreases, its pressure increases.

Subsequently, when the pressure detected by the pressure detection means 3b reaches the reference value P0, the output of the comparison circuit 3e is set to H level, so the transistors 3e, □ are turned off, and the relay circuits 3e1. switch is turned off. Then, the driving of the motor 3e4 is stopped, and the valve 3c is stopped at that position. At this time, the flow rate and pressure of hot water in the heat exchanger 3a are approximately rated flow rate Q0 and rated pressure p.
o (within the shaded area in Figure 4).

In this way, regardless of the arrangement relationship between the outdoor unit 1 and the indoor unit 3, hot water at the rated pressure P0 and flow rate Q0 is circulated in the heat exchanger 3a, and the rated capacity of the heat exchanger 3a is maintained.
The room can be used as the setting value for the hot water heater.

In the above embodiment, the case where the pipes 2 and 4 are shortened is explained, but the same applies even when the pipes are longer than the rated use. Assuming such a case, a state in which the valve 3c is opened exactly halfway (a half-open state) may be used as a reference.

[Effects of the Invention] As explained above, according to the present invention, in a hot water heater consisting of an outdoor unit and an indoor unit, the hot water heater is provided at the hot water input port of the heat exchanger of the indoor unit, and the hot water is circulated from the outdoor unit. a pressure detection means for detecting the pressure of the hot water being circulated; a valve provided at one end of the heat exchanger for controlling the flow rate of the hot water to be circulated; Since a valve drive control means for controlling the opening and closing of the valve is provided, even if the length of the piping for circulating from the outdoor unit to the indoor unit is different, the heat exchanger can be operated without being affected by the piping. The pressure and flow rate of hot water inside the room can be set to the rated value, the temperature inside the room can be maintained at the set value, and the quality of the product can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a hot water heater showing an embodiment of the present invention, FIG. 2 is a partial sectional view of the hot water heater,
Figure 3 is a partial circuit diagram of the hot water heater, Figure 4 is a characteristic diagram showing the relationship between pressure and flow rate in the heat exchanger of the hot water heater, and Figure 5 is a schematic block diagram of the conventional hot water heater. It is a diagram. In the figure, 1 is an outdoor unit, 1a is a boiler section, 1b is a pump, 2
, 4 is piping, 3 is outdoor unit, 3a is heat exchanger, 3b is pressure detection means (pressure sensor), 3c is valve, 3d is pipe, 3
e is a valve drive control means, 3e is a reference pressure setting device, 3e2
3e3 is a comparison circuit, 3e3 is a drive unit, 3e31 is an inverter circuit, 3e3□ is a transistor, 3e1. is a relay circuit,
3e4 is a motor, and 3e is a power supply. Patent Applicant: Fujitsu General Co., Ltd. Representative, Patent Attorney Takuya Ohara Figure 1 Figure 2 - Figure 3 Figure 4 Figure 5

Claims (4)

[Claims] (1) A hot water heater consisting of an outdoor unit and an indoor unit, a pressure detection means provided at a hot water input port of a heat exchanger of the indoor unit to detect the pressure of hot water circulated from the outdoor unit; A valve provided at one end of the heat exchanger to control the flow rate of the circulated hot water, and a valve drive control means to control opening and closing of the valve according to the pressure detected by the pressure detection means. A hot water heater characterized in that the pressure and flow rate of hot water circulated through the heat exchanger are controlled to a rated value. (2) Claim (1) wherein the pressure detection means is a pressure sensor.
) hot water heater. (3) The valve drive control means includes a reference pressure setting device for setting a pressure reference value in the heat exchanger in advance, and a reference value set by the reference pressure setting circuit and detected by the pressure detection means. 2. The hot water heater according to claim 1, further comprising: a comparison circuit that compares the calculated pressure value with the pressure value obtained by the comparison circuit; and a drive device that opens and closes the valve in accordance with the comparison result of the comparison circuit. (4) The hot water heater according to claim 2, wherein the pressure sensor is a diffusion type semiconductor element that utilizes a piezoresistance effect.