JPH01115075A - Fluid heater - Google Patents

Abstract

PURPOSE:To enable fluid to be heated uniformly and simplify the constitution in which failure, etc., are rare by providing a power supply means which supplies high frequency current, an inductive heating means which is to be connected with it, a temperature adjusting means which adjusts the temperature of fluid and a fluid introduction means which introduces the fluid within the range where eddy current is induced by the induction heating means. CONSTITUTION:When a high frequency power source 1 is switched on, voltage V generated in the high frequency power source 1 is applied to an induction heating coil 3, and coil current 1c flows in accordance with impedance Z including a water introduction tube 4. The water introduction tube 4 is exposed to magnetic field proportional to the product of the winding number N of a high frequency coil 3 and the coil current 1c, and eddy current flows in the water introduction tube 4 and jure loss by the resistance of the water introduction tube 4 itself is generated and heated for itself. For adjustment of water temperature, a temperature sensor 8 detects it and opens a power source opening/closing equipment 9 and automatically opens or closes the high frequency power source 1 in its turn. Hereby, a fluid heater which can heat the fluid uniformly and is simple in construction causing only few troubles, etc., can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to a fluid heating device which is an instantaneous water heater for tap water etc. for domestic use, and a fluid heating device for industrial use which is an instantaneous water heater for water such as industrial water and other various liquids and various gases (hereinafter referred to as , ``other various liquids and various gases'' are referred to as ``r liquids, etc.'').

[Prior Art] Fig. 4 is a vertical sectional view showing a conventional instantaneous water heater disclosed in, for example, Japanese Patent Publication No. 40-9673, and Fig. 5 is a longitudinal sectional view of a conventional instantaneous water heater disclosed in, for example, Japanese Patent Application Laid-open No. 61-122453. FIG.
10) is made of iron, (11) is a wood pipe, (12) is a gas burner, (13) is a tank, (14) is a heater, (15) is a water inlet pipe, and (16) is a hot water outlet pipe. be.

Conventional instantaneous water heaters are each configured as described above, and the former uses a gas burner (12) to directly heat the water pipe (11) to heat the water flowing through the water pipe (11) instantly. It's a water heater. The latter is an instantaneous water heater that uses a heater (14) to generate heat by passing an electric current through the heater (14), and heats water by bringing it into contact with the heater (14).

[Interstitial Points to be Solved by the Invention] In the conventional instantaneous water heaters as described above, the water pipes are corroded by the flame of the gas burner using city gas or propane gas, so it is necessary to make the water pipes thicker. In addition, there was a problem in that the water pipes were locally overheated because combustion products were generated and the flames directly hit the water pipes, and the water was not heated uniformly. Further, in the latter case, since the water comes into direct contact with the heater, failures such as disconnection of the heater are likely to occur, and furthermore, there are problems in that it is difficult to properly adjust the temperature of the water.

The present invention was made to solve these problems, and an object of the present invention is to provide a simple fluid heating device that can uniformly heat a fluid and is less likely to malfunction.

[Means for Solving the Problems] A fluid heating device according to the present invention includes a power supply means for supplying a high frequency current, an induction heating means connected to the power supply means, and a temperature adjustment means capable of adjusting the temperature of the fluid. and a fluid introducing means for guiding the fluid into a range where an eddy current is induced when the high frequency current flows through the induction heating means.

[Operation] In the present invention, the induction heating means inductively heats the fluid introduction means to heat the fluid introduced into the fluid introduction means.

[Embodiment FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.
In the figure, (1) and (2) are power supply means, and in this embodiment, (1) is a high-frequency power supply, (2) is a high-frequency capacitor connected in parallel to this high-frequency power supply (1), and (3) is a high-frequency power supply.
) is an induction heating means, which in this embodiment includes an induction heating coil (4) connected between both ends of a high frequency power source (1);
(5a), (5b), and (6) are fluid introduction means, and in this embodiment, (4) is a water introduction pipe made of a material that does not easily corrode.

In addition, an induction heating coil (
3) is wrapped around it. (5a) and (5b) are attached to both ends of the water introduction pipe (4), and are made of an insulator such as vinyl chloride; (6) is attached to the latter attachment (5b), and is grounded by a lead wire. Collection': 4 trees, (7) is the attachment (
5a) is a water faucet connected to the water inlet pipe (4), (7a) is the cock of this faucet (7), (8) and (
9) is a temperature control means, and in this embodiment, (8) is a temperature sensor attached to the upper outer periphery of the water introduction pipe (4), and (9) is a high frequency power source (1) and an induction heating coil (3).
This is the power switch connected between the In addition, the power switch (9) is connected to the signal line from the temperature sensor (8),
It is opened and closed by a temperature sensor (8).

In the fluid heating device configured as described above, when the switch (not shown) of the high frequency power source (<1) is turned on, a voltage is applied to both ends of the induction heating coil (3) via the high frequency capacitor (2). . The induction heating coil (3) is connected to the voltage V generated by the high frequency power supply (1) and the water introduction pipe (which becomes the load).
Impedance Z of induction heating coil (3) including 4)
Coil current Ic flows in accordance with. The water introduction pipe (4) is exposed to a magnetic field proportional to the product of the number of turns N of the high frequency coil (3) and the flow IC through the coil 1. For this purpose, the water inlet pipe (4)
An eddy current flows through the water inlet pipe (4), and Joule loss occurs due to the resistance of the water introduction pipe (4) itself, which generates heat by itself. In this way, by opening the cock (7a) of the water faucet (7), water flows through the water introduction pipe (4) and is continuously heated by being given heat from the water introduction pipe (4), which is generating heat. .

The water temperature can be adjusted using the temperature sensor (8) through the water inlet pipe (4).
Detects the temperature of the power supply switch (
9), and by automatically opening and closing the high frequency power supply (1).

A safety precaution against leakage of eddy currents is provided by attachments (5a) and (5b) fitted at both ends of the water inlet pipe (4). The attachment (5a) also has a vA function for connecting the water introduction pipe (4) to an existing water faucet (7). Furthermore, since there is a risk of leakage through water, a current collector (6) is attached to the attachment (5b) and grounded. The current collector (6) is made of a good conductor such as copper, and has countless small holes in the disk so that water can flow through it so that even a small amount of water can come into contact with the current collector (6).

Figure 2 is an electrical system diagram showing the high frequency generator (inverter) (la) that constitutes a part of the high frequency power supply (1) shown in Figure 1, together with the high frequency capacitor (2) and induction heating coil (3). be.

The high frequency generator (la) is composed of, for example, diodes, transistors, etc. as shown in the figure, and is a device that generates the optimum frequency to increase the induction heating effect, which depends on the shape, material, etc. of the water introduction pipe (4). It is. This high frequency device (1a) rectifies the voltage of an AC power supply (not shown) with a diode, and converts the voltage of 10KHz and 20KHz with a transistor.
Convert to power of frequency such as

The high frequency capacitor (2) is inserted to improve the power factor and is used to reduce the capacity of the high frequency coil W(la), but may be omitted if the power factor of the high frequency coil (3) is good. good.

FIG. 3 is a partial longitudinal cross-sectional view showing the induction heating coil (3) and water introduction pipe (4) shown in FIG. It is made up of tubes. Moreover, the plurality of subdivided tubes are arranged inside the induction heating coil (3) so that the tubes do not come into contact with each other.

This is because the induced eddy current bus increases by the number of subdivided tubes, improving electrical efficiency.

Further, by subdividing the water introduction pipe (4), the contact area between the water and the pipe is expanded, and heating is easy and uniform.

In this embodiment, as explained above, the water introduction pipe (4) composed of a plurality of subdivided pipes is connected to the induction heating coil (3).
), the water flowing through the water inlet pipe (4) is heated, and the temperature of the water is easily adjusted. Moreover, water can be heated uniformly. Furthermore, since the water introduction pipe is not directly exposed to combustion products or exposed to flame, corrosion is less likely to occur.

In addition, in the above embodiment, the current collector (6) is attached to the attachment (
5b), but the attachment (5J
1) and the water faucet (7), leakage of eddy currents can be further prevented.

In addition, in the above embodiment, the temperature of the water is controlled by a temperature sensor (8
) Based on the temperature detected by the temperature sensor (8), this was achieved by operating the power source rMm device (9), but based on the temperature detected by the temperature sensor (8), the cock (7a)
It goes without saying that the above objective can be achieved by adjusting the flow rate of water using a solenoid valve or the like which can close the valve WR by controlling an electric signal provided separately from 7a).

Furthermore, a non-contact sensor such as a phototube is installed near the fluid heating device, and when the non-contact sensor such as a phototube is blocked by a person's hand or something else, or while it is blocked, the above-mentioned function is automatically activated. The solenoid valve, etc. and the power switch (9) of the high frequency power source (1) are controlled ON-OFF. In this way, the necessary hot water will be automatically obtained from the casing, making it easier to use.

By the way, in the above explanation, we talked about the case where it is used to heat water, but it goes without saying that it can also be used to heat liquids. It is necessary to use materials that will not be damaged.

[Effects of the Invention] As described above, the present invention includes a power supply means for supplying a high frequency current, an induction heating means connected to the power supply means, a temperature adjustment means capable of adjusting the temperature of the driftwood, and the induction heating means. By means of the fluid introducing means for guiding the fluid into a range where eddy currents are induced when the high frequency current flows, it is possible to uniformly heat the fluid and obtain a simple fluid heating device with few failures. be.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is an electrical system diagram showing a part of the embodiment of the invention shown in FIG. 1, and FIG. 3 is a diagram showing the electrical system shown in FIG. FIG. 4 is a partial vertical sectional view showing a part of an embodiment of the present invention; FIG. 4 is a longitudinal sectional view showing a conventional instantaneous water heater; FIG. 5 is a partial vertical sectional view showing another conventional instantaneous water heater.
FIG. 1 is a sectional view. In the figure, (1) is a high-frequency power supply, (1a) is a high-frequency generator, (2) is a high-frequency capacitor, (3) is an induction heating coil, (4) is a water introduction pipe, and (5a) and (5b) are attachments. , (6) is the current collector, (7) is the water faucet, (
7a) is a cock, (8) is a temperature sensor, and (9) is a 1m power switch. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1 72 Figure 3111 Figure 4 n 1st Figure 5

Claims (6)

[Claims] (1) A fluid heating device having a flow rate adjustment means capable of adjusting the flow rate of the fluid and connected to a fluid supply means for supplying the fluid, a power supply means for supplying a high frequency current, and a fluid heating device connected to the power supply means. an induction heating means capable of adjusting the temperature of the fluid, a temperature adjustment means capable of adjusting the temperature of the fluid, and a fluid introducing means for guiding the fluid into a range where an eddy current is induced when the high frequency current flows through the induction heating means; A fluid heating device characterized in that the fluid that is continuously guided is heated while the temperature is controlled by induction heating of the introducing means. (2) The fluid introduction means comprises a water introduction pipe, attachments attached to both ends of the water introduction pipe, and a current collector attached to at least one of the attachments and grounded. The fluid heating device according to item 1. (3) The fluid introduction means is a plurality of subdivided tubes, and the induction heating means is coil-shaped, and the induction heating means is wound around the outer periphery of the fluid introduction means. The fluid heating device according to scope 1 or 2. (4) The temperature adjustment means comprises a temperature sensor attached to the fluid introduction means and a power switch connected between the power supply means and the induction heating means, and the power switch is operated based on the temperature detected by the temperature sensor. The fluid heating device according to any one of claims 1 to 3, characterized in that the temperature of the fluid is adjusted to be constant by controlling the temperature of the fluid. (5) The temperature adjustment means is a temperature sensor attached to the fluid introduction means, and the flow rate adjustment means is a cock or a solenoid valve, and the cock or solenoid valve is adjusted based on the temperature detected by the temperature sensor. The fluid heating device according to any one of claims 1 to 3, characterized in that the flow rate of the fluid is adjusted and the temperature of the fluid is adjusted to be constant. (6) The temperature adjustment means consists of a temperature sensor attached to the fluid introduction means and a power supply switch connected between the power supply means and the induction heating means, and the flow rate adjustment means is a solenoid valve and is provided externally. Claims 1 to 3 characterized in that a fluid at a constant temperature and a constant flow rate is automatically obtained by controlling the power supply switch and the solenoid valve based on a non-contact sensor. The fluid heating device according to any one of the above.