Heating device control method and heating device

Abstract

A method for controlling a heating device and a heating device capable of effectively heating a workpiece are provided. [Solution] A control method for a heating device which supplies steam to heat a workpiece 2, the control method for a heating device comprises a steam converter 3 which converts steam from a boiler into steam of a lower pressure than the original steam, a first passage 4 which guides the steam from the steam converter 3 to the workpiece 2, a first proportional control valve 5 provided in the middle of the first passage 4, and a first control unit 7 which controls the aperture of the first proportional control valve 5 in an open direction when the temperature in a heating chamber 6 which heats the workpiece 2 is below a predetermined temperature, the steam converter 3 stores water in a container 30, and the tip of a second passage 8 is positioned in the stored water, and the second passage 8 guides steam from the boiler to the steam converter 3, and when the temperature in the heating chamber 6 is below a predetermined temperature, the first control unit 7 controls the aperture of the first proportional valve 5 in an open direction.

Description

[Technical field]

[0001] The present invention relates to a heating device control method and a heating device, and more particularly to a heating device and a heating device control method capable of effectively heating a workpiece. [Background technology]

[0002] Conventionally, for example, there is a food manufacturing method that uses superheated steam (see FIG. 1 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-83547 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while the above-mentioned food production method using superheated steam is suitable for grilling meat, when steaming and heating food paste products such as kamaboko and ham, if the superheated steam is brought into contact with the object to be heated at atmospheric pressure, the superheated steam cannot immediately change into water when it comes into contact with the object to be heated, making it difficult to create a condensation heat transfer effect, and making it difficult to effectively heat the object to be processed.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a heating device control method and a heating device, which have been made in consideration of the above problems. [Means for solving the problem]

[0006] The method for controlling a heating device according to claim 1 comprises: Bo A steam converter that converts the steam from the heater into steam at a lower pressure than the steam from the heater, and the steam from the steam converter sufferedThe steam converter is provided with a first passage leading to a workpiece, a first proportional control valve provided in the middle of the first passage, and a first control unit for controlling the aperture of the first proportional control valve in an opening direction when the temperature in a heating chamber for heating the workpiece is equal to or lower than a predetermined temperature. The steam converter stores water in a container, and a tip of a second passage is located in the stored water. The second passage is connected to the steam from the boiler. The above The steam is introduced into the steam converter, and when the temperature inside the heating chamber is equal to or lower than a predetermined temperature, the first control unit controls the first proportional control It controls the valve opening in the opening direction.

[0007] A method of controlling a heating device according to claim 2 includes a steam converter that converts steam from a boiler into steam having a lower pressure than the steam from the boiler, a first passage that introduces the steam from the steam converter to a workpiece, a first proportional control valve provided in the first passage, a first control unit that controls an aperture of the first proportional control valve in an open direction when a temperature in a heating chamber that heats the workpiece is equal to or lower than a predetermined temperature, a second passage that introduces the steam from the boiler to the steam converter, a second proportional control valve provided in the second passage, and a second control unit that controls an aperture of the second proportional control valve in an open direction when a pressure in the steam converter is equal to or lower than a predetermined pressure, the steam converter stores water in a container, an end of a second passage is located in the stored water, and the second passage guides the steam from the boiler to the steam converter; When the temperature inside the heating chamber is below a predetermined temperature, the first control unit controls the aperture of the first proportional control valve in the open direction, and when the pressure inside the steam converter is below a predetermined pressure, the second control unit controls the aperture of the second proportional control valve in the open direction.

[0008] In addition, the control method for a heating device recited in claim 3 is the control method for a heating device recited in claim 2, in which, when the heating device starts up, the second proportional control valve is fully opened and steam from the boiler is guided into the water stored in the steam converter via a second passage.

[0009] A method of controlling a heating device according to claim 4 includes a steam converter that converts steam from a boiler into steam having a lower pressure than the steam from the boiler, a first passage that introduces the steam from the steam converter to a workpiece, a first proportional control valve provided in the first passage, a first control unit that controls an aperture of the first proportional control valve in an open direction when a temperature in a heating chamber that heats the workpiece is equal to or lower than a predetermined temperature, a second passage that introduces the steam from the boiler to the steam converter, a second proportional control valve provided in the second passage, and a second control unit that controls an aperture of the second proportional control valve in an open direction when a pressure in the steam converter is equal to or lower than a predetermined pressure, the steam converter stores water in a container, an end of a second passage is located in the stored water, and the second passage guides the steam from the boiler to the steam converter; When the temperature inside the heating chamber is below a predetermined temperature, the first control unit controls the aperture of the first proportional control valve in the open direction, and when the pressure inside the steam converter is below a predetermined pressure, the second control unit controls the aperture of the second proportional control valve in the open direction.When operation of the heating chamber is stopped, the second proportional control valve is given priority over the first proportional control valve, and the second proportional control valve is fully closed, and thereafter the first proportional control valve is fully closed.

[0010] A method for controlling a heating device according to claim 5 is the method for controlling a heating device according to any one of claims 1 to 4, No exhaust valve is provided in the first passage on the steam converter side of the first proportional control valve. It is something.

[0011] A heating device according to claim 6 includes a steam converter that converts steam from a boiler into steam having a lower pressure than the steam from the boiler, a first passage that introduces the steam from the steam converter to a workpiece, a first proportional control valve provided in the first passage, a first control unit that controls an aperture of the first proportional control valve in an open direction when a temperature in a heating chamber that heats the workpiece is equal to or lower than a predetermined temperature, a second passage that introduces the steam from the boiler to the steam converter, a second proportional control valve provided in the second passage, and a second control unit that controls an aperture of the second proportional control valve in an open direction when a pressure in the steam converter is equal to or lower than a predetermined pressure, The steam converter stores water in a container, and an end of a second passage is located in the stored water, and the second passage guides the steam from the boiler to the steam converter. .

[0012] The heating device according to claim 7 is the heating device according to claim 6, No exhaust valve is provided in the first passage on the steam converter side of the first proportional control valve. It is something. Effect of the Invention

[0013] According to the control method for a heating device described in claim 1, when the temperature inside the heating chamber in which the workpiece is heated is below a predetermined temperature, the first control unit controls the aperture of the first proportional control valve in the opening direction to increase the temperature inside the heating chamber, and at the same time, steam converted by the steam converter to steam with a pressure lower than the steam pressure from the boiler (steam with a high dryness that is not superheated steam) is supplied to the workpiece, thereby effectively heating the workpiece (condensation heat transfer effect).

[0014] Furthermore, according to the control method for a heating device set forth in claim 2, in addition to the effects of the invention set forth in claim 1 described above, when the pressure in the steam converter is equal to or lower than a predetermined pressure, the second control unit controls the aperture of the second proportional control valve in the opening direction, thereby preventing a decrease in the amount of steam from the steam converter and preventing deterioration of the heating state of the workpiece.

[0015] Furthermore, according to the control method for a heating device described in claim 3, in addition to the effects of the invention described in claim 2 described above, when the heating device starts up, the second proportional control valve is fully opened and steam from the boiler is guided through the second passage into the water stored in the steam converter, thereby promoting steam generation in the steam converter.

[0016] Furthermore, according to the control method for a heating device set forth in claim 4, when the operation of the heating device is stopped, the second proportional control valve is given priority over the first proportional control valve and the second proportional control valve is fully closed, so that steam from the boiler is not wasted and damage to the steam converter due to an increase in pressure in the steam converter can be prevented. Furthermore, after the second proportional control valve is fully closed, the first proportional control valve is fully closed, so that it is possible to prevent the intrusion of foreign objects such as insects through the first passage into the steam converter in which water has accumulated.

[0017] In addition, according to the heating device described in claim 6, when the temperature inside the heating chamber in which the workpiece is heated is below a predetermined temperature, the first control unit controls the aperture of the first proportional control valve in the opening direction to increase the temperature inside the heating chamber, and at the same time, steam converted by the steam converter to steam with a pressure lower than the steam pressure from the boiler (steam with a high dryness that is not superheated steam) is supplied to the workpiece, thereby effectively heating the workpiece (condensation heat transfer effect).

[0018] Also, claims 6 According to the method for controlling the heating device described , steamed When the pressure inside the steam converter is below a predetermined pressure, the second control unit controls the aperture of the second proportional control valve in the opening direction to prevent a decrease in the amount of steam from the steam converter and to prevent deterioration of the heating condition of the workpiece. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram of a heating device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A heating device and a method for controlling a heating device according to an embodiment of the present invention will be described with reference to FIG.

[0021] V shown in Fig. 1 is a heating device (e.g., a steamer) that supplies steam to heat the workpiece 2 on the conveyor 1. The workpiece is, for example, food ingredients (food), more specifically, fish paste products such as kamaboko and ham, Chinese foods such as shumai and gyoza, processed seafood products such as crab and shellfish, and processed meat products such as pork, chicken, and beef.

[0022] Reference numeral 3 denotes a steam converter which converts steam (e.g., 0.7 MPa, 170°C) from a boiler (not shown) into steam of a lower pressure [e.g., saturated steam (104°C) at 0.02 MPa]]. Steam converter 3 is specifically a steam changer (SC-500, SC-200, SC-200D) manufactured by Marutaka Kogyo Co., Ltd., and more specifically a steam quality converter as shown in FIG. 1 and disclosed in Japanese Utility Model Application Publication No. 8-553. The reason why the steam converter 3 is used in the present invention is that the steam reduced in pressure by the pressure reducing valve can become superheated steam (high-temperature steam produced by further heating the saturated steam generated by boiling water), and that superheated steam is not suitable for heating the product to its core temperature. 31 is the water surface, 32 is an air-water separator, 34 is a water surface control device, 35 is a breakwater, 36 is a liquid surface relay device, 37 is an overflow pipe, 38 is an electromagnetic valve, 39 is a connecting passage, and Z is steam. In addition, in the steam converter 3, steam from a boiler (not shown) is used as a heat source to boil water in the steam converter 3 and convert the steam from the boiler (not shown, for example, 0.7 MPa, 170°C) into steam of a lower pressure [for example, saturated steam at a temperature higher than 100°C, more specifically, saturated steam at 0.02 MPa (104°C)] (saturated steam generated by boiling water).

[0023] Reference numeral 4 denotes a first passage that guides steam from the steam converter 3 to the workpiece 2, and reference numeral 5 denotes a first proportional control valve (a proportional control valve is an electromagnetic valve whose opening can be adjusted steplessly in proportion to the voltage or current applied to the electromagnetic valve) provided midway through the first passage 4. The steam converter 3 stores water in a container 30, and the tip of a second passage 8 is positioned within the stored water.

[0024] Further, 7 is a first control unit that controls the aperture of the first proportional control valve 5 in the opening direction when the temperature inside the heating chamber 6 that heats the workpiece 2 is below a predetermined temperature (e.g., 95°C), and controls the aperture of the first proportional control valve 5 in the closing direction when the temperature inside the heating chamber 6 exceeds the predetermined temperature (e.g., 97°C). That is, when the temperature inside the heating chamber 6 is equal to or lower than a predetermined temperature (for example, 95° C.), the first control unit 7 When the temperature inside the heating chamber 6 exceeds a predetermined temperature (for example, 97° C.), the opening of the first proportional control valve 5 is controlled in the closing direction. In addition, 60 is a nozzle that blows steam into the heating chamber 6.

[0025] Therefore, according to the above-mentioned heating device (control method for the heating device) V, when the temperature inside the heating chamber 6 in which the workpiece 2 is heated is below a predetermined temperature, the first control unit 7 controls the aperture of the first proportional control valve 5 in the opening direction to increase the temperature inside the heating chamber 6, and at the same time, steam (not superheated steam but having a high dryness) converted by the steam converter 3 to a pressure lower than the steam pressure from a boiler (not shown) is supplied to the workpiece 2, thereby effectively heating the workpiece 2 (condensation heat transfer effect).

[0026] Also, 8 is a second passage for guiding steam from a boiler (not shown) to the steam converter 3, Reference numeral 9 denotes a second proportional control valve (a proportional control valve is a solenoid valve whose opening can be adjusted steplessly in proportion to the voltage or current applied to the solenoid valve) provided in the middle of the second passage 7, and reference numeral 10 denotes a second control unit which controls the opening of the second proportional control valve 9 in the open direction when the pressure inside the steam converter 3 is equal to or lower than a predetermined pressure (e.g., 0.02 MPa), and controls the opening of the second proportional control valve 9 in the closed direction when the pressure exceeds the predetermined pressure (e.g., 0.05 MPa). In other words, when the pressure inside the steam converter 3 is below a predetermined pressure (e.g., 0.02 MPa), the second control unit 10 controls the aperture of the second proportional control valve 9 in the opening direction to prevent a decrease in the amount of steam from the steam converter 3 and to prevent the heating condition of the workpiece 2 from deteriorating; and when the pressure inside the steam converter 3 exceeds a predetermined pressure (e.g., 0.05 MPa), the second control unit 10 controls the aperture of the second proportional control valve 9 in the closing direction to prevent a rise in the temperature of the steam from the steam converter 3 and to prevent the heating condition of the workpiece 2 from deteriorating.

[0027] Furthermore, the second control unit 10 can fully open the second proportional control valve 9 when the heating device V starts up, and introduce steam from a boiler (not shown) into the water stored in the steam converter 3 via the second passage 8, thereby promoting steam generation in the steam converter 3. It is to be noted that, preferably, the first proportional control valve 5 is also fully opened when the heating device V starts up.

[0028] In addition, when the operation of the heating device V is stopped, the control unit 100 gives priority to the second proportional control valve 9 over the first proportional control valve 5, fully closes the second proportional control valve 9, and then fully closes the first proportional control valve 5. As a result, steam from the boiler (not shown) is not wasted, and damage to the steam converter 3 due to an increase in pressure within the steam converter 3 can be prevented. Furthermore, since the first proportional control valve 5 is fully closed after the second proportional control valve 9 is fully closed, it is also possible to prevent foreign objects such as insects from entering the steam converter 3 containing stored water through the first passage 4. [Explanation of symbols]

[0029] V heating device 1 Conveyor 2 Workpiece 3 Steam converter 4. First Passage 5. First proportional control valve 6 Heating chamber 7 First control section 8. Second Passage 9 Second proportional control valve 10 Second control section 30 containers

Claims

1. a steam converter for converting steam from a boiler to steam at a lower pressure than the steam from the boiler; a first passageway for directing steam from the steam converter to a workpiece; a first proportional control valve provided in the middle of the first passage; a first control unit that controls an aperture of the first proportional control valve in an opening direction when a temperature in a heating chamber for heating the workpiece is equal to or lower than a predetermined temperature, The steam converter stores water in a container, and an end of the second passage is located in the stored water, the second passage directs the steam from the boiler to the steam converter; When the temperature in the heating chamber is equal to or lower than a predetermined temperature, the first control unit controls the opening of the first proportional control valve in an opening direction. A method for controlling a heating device comprising:

2. a steam converter for converting steam from a boiler to steam at a lower pressure than the steam from the boiler; a first passageway for directing steam from the steam converter to a workpiece; a first proportional control valve provided in the middle of the first passage; a first control unit that controls an aperture of the first proportional control valve in an opening direction when a temperature in a heating chamber for heating the workpiece is equal to or lower than a predetermined temperature; a second passageway directing the steam from the boiler to the steam converter; a second proportional control valve provided in the middle of the second passage; a second control unit that controls an opening degree of the second proportional control valve in an opening direction when the pressure in the steam converter is equal to or lower than a predetermined pressure, The steam converter stores water in a container, and an end of the second passage is located in the stored water, the second passage directs the steam from the boiler to the steam converter; When the temperature in the heating chamber is equal to or lower than a predetermined temperature, the first control unit controls the opening of the first proportional control valve in an opening direction; When the pressure in the steam converter is equal to or lower than a predetermined pressure, the second control unit controls the opening of the second proportional control valve in an opening direction. A method for controlling a heating device comprising:

3. During start-up, the second proportional control valve is fully opened to guide steam from the boiler through the second passage into the water stored in the steam converter.

3. The method for controlling a heating device according to claim 2.

4. a steam converter for converting steam from a boiler to steam at a lower pressure than the steam from the boiler; a first passageway for directing steam from the steam converter to a workpiece; a first proportional control valve provided in the middle of the first passage; a first control unit that controls an aperture of the first proportional control valve in an opening direction when a temperature in a heating chamber for heating the workpiece is equal to or lower than a predetermined temperature; a second passageway directing the steam from the boiler to the steam converter; a second proportional control valve provided in the middle of the second passage; a second control unit that controls an opening degree of the second proportional control valve in an opening direction when the pressure in the steam converter is equal to or lower than a predetermined pressure, The steam converter stores water in a container, and an end of the second passage is located in the stored water, the second passage directs the steam from the boiler to the steam converter; When the temperature in the heating chamber is equal to or lower than a predetermined temperature, the first control unit controls the opening of the first proportional control valve in an opening direction; When the pressure in the steam converter is equal to or lower than a predetermined pressure, the second control unit controls the aperture of the second proportional control valve in an opening direction; When the operation of the heating chamber is stopped, the second proportional control valve is given priority over the first proportional control valve, and the second proportional control valve is fully closed, and thereafter, the first proportional control valve is fully closed. A method for controlling a heating device comprising:

5. No exhaust valve is provided in the first passage on the steam converter side of the first proportional control valve.

5. A method for controlling a heating device according to claim 1.

6. a steam converter for converting steam from a boiler to steam at a lower pressure than the steam from the boiler; a first passageway for directing the steam from the steam converter to a workpiece; a first proportional control valve provided in the middle of the first passage; a first control unit that controls an aperture of the first proportional control valve in an opening direction when a temperature in a heating chamber for heating the workpiece is equal to or lower than a predetermined temperature; a second passageway directing the steam from the boiler to the steam converter; a second proportional control valve provided in the middle of the second passage; a second control unit that controls an opening degree of the second proportional control valve in an opening direction when the pressure in the steam converter is equal to or lower than a predetermined pressure, The steam converter stores water in a container, and an end of the second passage is located in the stored water, The second passageway directs the steam from the boiler to the steam converter. A heating device characterized by:

7. No exhaust valve is provided in the first passage on the steam converter side of the first proportional control valve.

7. The heating device according to claim 6.

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