JP4265847B2 - High-temperature pressurized hot water generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-temperature pressurized hot water generator mainly used for cleaning, sterilization, cooking and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it is known to use pressurized high-temperature hot water that can supply a large amount of energy when heating at 100 ° C. or higher, for example, in a unit operation of processing cooking by heating food. Conventional pressurized hot water heaters are equipped with pressure sensors, flow rate sensors, humidity sensors, temperature sensors, and pressure regulators that are arranged in conjunction with each sensor, and flow rate adjustments. , A humidity regulator, and a temperature regulator, and pressurized hot water heated to a temperature higher than the food processing chamber temperature is supplied to the processing chamber (JP-A-11-89722).
[0003]
[Problems to be solved by the invention]
However, conventional pressurized high-temperature water heaters have rapid thermal efficiency that instantaneously recovers the pressure drop in the pipe due to the discharge of high-temperature water and the temperature drop due to the water supply to replenish it to the predetermined temperature. There was a problem that good heating was not possible.
[0004]
The present invention has been made in view of the above-mentioned problems, and the object thereof is to generate high-temperature pressurized hot water that can adjust the pressure of the heating part arbitrarily and is responsive and capable of heating with high thermal efficiency. Is to provide a device.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is provided in a tank for accumulating water, a water supply pump for supplying the water, and a downstream side of the water supply pump, and the water is supplied from the water supply pump to a predetermined pressure of 1 to 5 atm. A relief valve that maintains the value, an electromagnetic induction heating unit that is connected to the downstream side of the relief valve and heats the pressurized water, and is connected to a passage of the electromagnetic induction heating unit, and the passage is connected to the nozzle or the tank. A three-way valve, and the nozzle is configured to have a predetermined opening degree so as to store pressure in the passage, and between the three-way valve and the tank, the opening degree of the nozzle is approximately the same. A throttling valve that is throttled to an opening is provided. Thereby, the temperature of pressurized water can be arbitrarily adjusted in the range below the saturated liquid temperature according to a pressure. That is, since the required amount of high-temperature water whose temperature is accurately controlled can be stably supplied, high-temperature water can be supplied according to each operation such as cleaning, sterilization, and cooking, and according to the processing process of each operation. The temperature and amount can be adjusted as appropriate. Thus, by heating the pressurized water, there is immediate response and heating with good thermal efficiency can be achieved, so that the cooking time can be shortened, the sterilization efficiency can be improved, and the gelatinization degree can be improved.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a device configuration diagram of a high-temperature pressurized hot water generator 1. The high-temperature pressurized hot water generator 1 has a tank 2, a water supply pump 3, a relief valve 4, an electromagnetic induction heating device 5, a safety valve 13, and a three-way valve (switching means) 18. High-temperature pressurized hot water is generated.
[0007]
The tank 2 is connected to the passage of the electromagnetic induction heating device 5 through the water supply pump 3 and accumulates water as an object to be heated. The tank 2 is provided with a water level sensor 6 to detect the water level in the tank 2. A water supply source (not shown) is connected to the upstream side of the tank 2. The water supply source supplies water into the tank 2 when the valve 7 is opened based on the detection signal of the water level sensor 6.
[0008]
The water supply pump 3 is provided on the downstream side of the tank 2 via a valve 8, and 1.013 × between the nozzle 9 and the nozzle 9 squeezed to a predetermined opening degree by supplying water in the tank 2. A predetermined water pressure of 10 @ 5 to 5.065.times.10@5 Pa (1 to 5 atm) is applied. As a result, a predetermined amount of pressurized water is supplied to the passage 14 of the electromagnetic induction heating device 5. The tank 2, the valve 8, and the water supply pump 3 are connected in a loop through a relief valve 4, so that pressurized water discharged from the relief valve 4 returns to the tank 2.
[0009]
The relief valve 4 is connected to the downstream side of the water supply pump 3, and when the water supplied from the water supply pump 3 is pressurized to a predetermined pressure or higher, the pressurized water is released to the tank 2, and between the water supply pump 3 and the nozzle 9. The water is kept at a predetermined water pressure of 1.013 × 10 5 to 5.065 × 10 5 Pa (1 to 5 atm). A pressure detector 10 is connected to the downstream side of the relief valve 4 so as to detect the water pressure between the water supply pump 3 and the nozzle 9.
[0010]
The electromagnetic induction heating device 5 is connected to the downstream side of the feed water pump 3 via the check valve 11. The check valve 11 is provided on the downstream side of the feed water pump 3 and the relief valve 4 so that pressurized hot water heated by the electromagnetic induction heating device 5 does not flow into the tank 2 via the relief valve 4.
[0011]
A nozzle 9 is provided at the tip of the passage 14 of the electromagnetic induction heating device 5 via a three-way valve 18. In the nozzle 9, the water supplied by the water supply pump 3 is pressurized to a predetermined pressure of 1.013 × 10 5 to 5.065 × 10 5 Pa (1 to 5 atm) between the water supply pump 3 and the nozzle 9. As described above, the opening is reduced to a predetermined degree. A temperature sensor 12 is provided in the vicinity of the nozzle 9. The temperature sensor 12 is connected to a high-frequency power source 15 (see FIG. 2) of the electromagnetic induction heating device 5 and detects the temperature of the hot pressurized hot water.
[0012]
The safety valve 13 is a valve that allows water vapor to escape to the tank 2 when the downstream side of the passage 14 of the electromagnetic induction heating device 5 exceeds a predetermined pressure, and is connected between the electromagnetic induction heating device 5 and the three-way valve 18. . The safety valve 13 is connected to the tank 2, the valve 8, the feed water pump 3, the check valve 11, and the electromagnetic induction heating device 5 in a loop shape. The safety valve 13 is configured by connecting the safety valves 13a and 13b in parallel. However, the safety valve 13 is not limited to this and may be one.
[0013]
The three-way valve 18 is a valve that switches the course of the high-temperature pressurized hot water to the tank 2 side or the nozzle 9 side, and is connected to the downstream side of the connection portion 19 between the electromagnetic induction heating device 5 and the safety valve 13. The three-way valve 18 is connected to the tank 2, the valve 8, the feed water pump 3, the check valve 11, and the electromagnetic induction heating device 5 in a loop shape. When switched to the tank 2 side, the three-way valve 18 comes out of the electromagnetic induction heating device 5. When the hot pressurized hot water is returned to the tank 2 and switched to the nozzle 9 side, the hot pressurized hot water is supplied to the nozzle 9 at a desired timing. A throttle valve (not shown) is provided between the three-way valve and the tank 2. In this throttle valve, similarly to the nozzle 9, the water supplied by the feed water pump 3 is 1.013 × 10 5 to 5.065 × 10 5 Pa (1 to 5 atm) between the feed water pump 3 and the throttle valve. It is throttled to a predetermined opening so as to be pressurized to this pressure. Thus, even if the three-way valve 18 is switched to either the tank 2 side or the nozzle 9 side, the pressurized water is 1.013 × 10 5 to 5.065 × 10 5 Pa (1 to 5) on the downstream side of the feed water pump 3. Pressure).
[0014]
Next, the detail of the electromagnetic induction heating apparatus 5 of embodiment is demonstrated. As shown in FIG. 2, the electromagnetic induction heating device 5 includes a pressurized water passage member 14, a high-frequency power source 15, a heating element 16, a coil 17, and the like. The passage member 14 is a non-magnetic material and a ceramic pipe excellent in heat resistance, and its inner hole becomes a passage of pressurized water. The passage member 14 is made of, for example, silicon nitride. The coil 17 is wound around the outer periphery of the passage member 14.
[0015]
As shown in FIG. 3, the heating element 16 is formed, for example, by alternately laminating first metal plates 31 and flat metal plates 32 that are bent in a zigzag mountain shape to form a cylindrical laminate as a whole. As the material of the metal plates 31 and 32, martensitic stainless steel such as SUS447J1 is used.
[0016]
As shown in FIG. 4, the heating element 16 is disposed such that a crest (or valley) 33 of the first metal plate 31 is inclined by an angle α with respect to the central axis 34, and is adjacent to the second metal plate 32. The peaks (or valleys) 33 of the matching first metal plates 31 are arranged so as to intersect. And the 1st metal plate 31 and the 2nd metal plate 32 are welded by spot welding in the intersection of the peak (or trough) 33 in the adjacent 1st metal plate 31, and it joins so that electrical conduction | electrical_connection is possible.
[0017]
Thus, the first small flow path 35 inclined by the angle α is formed between the outermost first metal plate 31 and the second metal plate 32, and the next second metal plate 32 and first metal plate are formed. A second small flow path 36 that is inclined by an angle −α is formed between the first small flow path 35 and the first small flow path 36 and an angle 2 × α. The first metal plate 31 and the second metal plate 32 are formed with a hole 37 as a third small flow path for generating a turbulent flow of pressurized water. Furthermore, the surface of the 1st metal plate 31 or the 2nd metal plate 32 is not smooth, and the fine unevenness | corrugation 38 is given by the satin finish processing or the embossing. The unevenness 38 is small enough to be ignored as compared with the height of the mountain (or valley) 33 (see FIG. 4).
[0018]
When the heating element 16 is inserted into the passage member 14 and a high-frequency current is applied to the coil 17 to cause a high-frequency magnetic field to act on the heating element 16, the first metal plate 31 and the second metal plate 31 arranged obliquely so as to cross the lines of magnetic force. An eddy current is generated in the entire metal plate 32, and the heating element 16 generates heat. The temperature distribution at this time is an eyeball shape extending in the longitudinal direction of the first metal plate 31 and the second metal plate 32, and heat is generated in the central portion from the outer peripheral portion and heated in the central portion to flow through the central portion. It has become advantageous. Further, the heating element 16 can generate heat up to a temperature (about 600 ° C.) determined by the magnetic characteristics (Curie point) such as SUS447J1 forming the metal plates 31 and 32.
[0019]
Further, as shown in FIG. 4, the first small flow path 35 and the second small flow path 36 intersecting in the heating element 16 diffuse the fluid between the periphery and the central portion, and in addition, the third small flow path is formed. Due to the presence of the holes 37, diffusion in the thickness direction between the first small flow path 35 and the second small flow path 36 is also performed. Accordingly, macro diffusion, diffusion, and volatilization of the fluid over the entire heating element 16 are generated by the small flow paths 35, 36, and 37, and micro diffusion, diffusion, and volatilization are generated by the minute unevenness 38 on the surface. As a result, the pressurized water passing through the heating element 16 has a substantially uniform flow, and a uniform contact opportunity between the first metal plate 31 and the second metal plate 32 and the pressurized water is given, and uniform heating is ensured.
[0020]
The electromagnetic induction heating device is not limited to the one using a ceramic pipe formed of a non-magnetic material like the electromagnetic induction heating device 5, but is made of metal in which a flow path for passing pressurized water is formed. The heating element may be directly heated. In this case, the metal heating element includes a pipe-like one and a columnar one provided with a plurality of passages therethrough, and forms a passage of pressurized water so as to correspond to the passage member 14.
[0021]
Based on said structure, operation | movement of the high temperature pressurization hot water generator 1 which concerns on embodiment is demonstrated. When the high-temperature pressurized hot water generator 1 is in a standby state, the three-way valve 18 is switched to the tank 2 side as shown in FIG. Next, the valve 8 is opened and the water in the tank 2 is supplied to the passage 14 of the electromagnetic induction heating device 5 by the water supply pump 3. A throttle valve (not shown) provided between the three-way valve 18 and the tank 2 is throttled to a predetermined opening, so that the supplied water is 1.013 × 10 5 between the feed water pump 3 and the throttle valve. The pressure is increased to a desired pressure of ˜5.065 × 10 5 Pa (1 to 5 atm). When the water pressure between the water supply pump 3 and the throttle valve exceeds the desired pressure due to the water supply from the water supply pump 3, the relief valve 4 operates and excess pressurized water returns to the tank 2, so the water pressure between the water supply pump 3 and the throttle valve is The desired pressure is maintained. The pressurized water maintained at a desired pressure is heated to a desired temperature by the heating element 16 that has generated heat to a high temperature in the passage 14 of the electromagnetic induction heating device 5, and returns to the tank 2. Thus, in the standby state, the hot pressurized hot water circulates between the tank 2, the valve 8, the feed water pump 3, the check valve 11, the electromagnetic induction heating device 5, the three-way valve 18, and the tank 2.
[0022]
When the high-temperature pressurized hot water generator 1 is in a normal operation state, the three-way valve 18 is switched to the nozzle 9 side as shown in FIG. Next, the valve 8 is opened and the water in the tank 2 is supplied to the passage 14 of the electromagnetic induction heating device 5 by the water supply pump 3. Since the nozzle 9 is throttled to a predetermined opening, the supplied water is between 1.013 × 10 5 to 5.065 × 10 5 Pa (1 to 5 atm) between the feed water pump 3 and the nozzle 9. Pressurized to pressure. When the water pressure between the water supply pump 3 and the nozzle 9 exceeds the desired pressure due to the water supply from the water supply pump 3, the relief valve 4 operates and excess pressurized water returns to the tank 2, so the water pressure between the water supply pump 3 and the nozzle 9 is The desired pressure is maintained. The pressurized water maintained at a desired pressure is heated to a desired temperature by the heating element 16 that generates heat to a high temperature in the passage 14 of the electromagnetic induction heating device 5, and travels toward the nozzle 9.
[0023]
Thus, since pressurized water flows in the passage 14 of the electromagnetic induction heating device 5, the pressurized water does not become water vapor but is heated to a desired temperature of about 100 ° C. to 150 ° C. according to the pressure. Further, the high frequency power supply 15 takes in the temperature of the high-temperature pressurized hot water from the temperature sensor 12 provided in the nozzle 9 and controls the temperature of the heating element 16 so as to raise the pressurized water to a desired temperature. In addition, even when the temperature of the heating element 16 rises and the hot pressurized hot water becomes steam in the passage 14 of the electromagnetic induction heating device 5, the steam is released to the tank 2 by the safety valves 13a and 13b. The downstream side of the device 5 can be maintained at a predetermined pressure.
[0024]
When the water supply pump 3 sends the water in the tank 2 to the passage 14 of the electromagnetic induction heating device 5 and the water level in the tank 2 falls to a certain value, the valve 7 opens based on the water level information from the water level sensor 6 and is not shown. Water is supplied from a water supply source, and the inside of the tank 2 is kept at a constant water level.
[0025]
【The invention's effect】
According to the first aspect of the present invention, the temperature of the pressurized water can be arbitrarily adjusted within the range of the saturated liquid temperature or less according to the pressure. That is, since the required amount of high-temperature water whose temperature is accurately controlled can be stably supplied, high-temperature water can be supplied according to each operation such as cleaning, sterilization, and cooking, and according to the processing process of each operation. The temperature and amount can be adjusted as appropriate. Thus, by heating the pressurized water, there is an immediate response and heating with high thermal efficiency can be performed, so that the cooking time can be shortened, the sterilization efficiency can be improved, and the gelatinization degree can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a high-temperature pressurized hot water generator.
FIG. 2 is a diagram illustrating an electromagnetic induction heating device.
FIG. 3 is a diagram illustrating a heating element.
FIG. 4 is a diagram illustrating a heating element.
[Explanation of symbols]
1. High-temperature pressurized hot water generator 2, tank 3, water supply pump 4, relief valve 5, electromagnetic induction heater 6, water level sensor 13, safety valve 18, three-way valve (switching means)

Claims (1)

A tank that accumulates water,
A water supply pump for supplying the water;
A relief valve provided on the downstream side of the water supply pump and maintaining the water at a predetermined value of 1 to 5 atm by the water supply of the water supply pump;
An electromagnetic induction heating unit connected to the downstream side of the relief valve and heating the pressurized water;
Wherein a three-way valve to connect the electromagnetic induction Yes connected in the path of the pressurized hot portion the passage nozzle or the tank, the nozzle is narrowed to a predetermined opening degree so as to store the pressure in the passage forming And a high-temperature pressurized hot water generator, characterized in that a throttle valve is provided between the three-way valve and the tank, the throttle valve being throttled to the same degree as the nozzle.

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