Vacuum microwave thawing machine

Abstract

In a vacuum microwave thawing machine, ensure that the vacuum level sensor is not calibrated unnecessarily. [Solution] When a first startup operation is performed on the operation unit 70, which is an operation to start the vacuum microwave thawing machine 10, the normal mode startup unit 122 starts the machine in a first mode (normal mode) for controlling the thawing of the object to be thawed. When a second startup operation, which is an operation different from the first startup operation, is performed on the operation unit 70, the factory setting mode startup unit 124 starts the machine in a second mode (factory setting mode) that allows calibration of the vacuum level sensor 66.

Description

Technical Field

[0001] The present invention relates to a vacuum microwave thawing machine.

Background Art

[0002] Conventionally, a vacuum microwave thawing machine that irradiates a thawing object with microwaves in a reduced pressure state (or vacuum state) lower than atmospheric pressure to thaw the thawing object is known, and an example thereof is described in Patent Document 1 below. The vacuum microwave thawing machine can thaw while suppressing temperature unevenness between the surface and the core and without destroying the cells of the food material by repeatedly performing heating by microwaves and sublimation cooling by the reduced pressure state. The vacuum microwave thawing machine described in Patent Document 1 below detects the vacuum pressure (degree of vacuum) that is the pressure inside the chamber (thawing chamber), and determines that thawing has ended when the degree of vacuum in the case of reaching an equilibrium state in the decompression process reaches the target value.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The degree-of-vacuum sensor deviates due to various factors such as the attachment of other parts to the chamber, the capacity of the vacuum pump, and the ambient temperature. Therefore, the vacuum microwave thawing machine is configured to check the operation of the degree-of-vacuum sensor and calibrate it after the assembly of all parts is completed. In addition, it is also necessary to perform regular maintenance to calibrate the degree-of-vacuum sensor. However, if the calibration of this degree-of-vacuum sensor is performed unintentionally by the user, it may lead to deterioration of the thawing quality and malfunction of the machine.

[0005] This invention has been made in view of such circumstances, and aims to prevent the calibration of the vacuum level sensor in a vacuum microwave thawing machine from being performed unintentionally. [Means for solving the problem]

[0006] To solve the above problems, the vacuum microwave thawing machine disclosed in this application has the following structure. (1) A vacuum microwave thawing machine, The vacuum microwave thawing machine comprises a thawing chamber for containing the object to be thawed, a vacuum pump for reducing the pressure inside the thawing chamber, a microwave generator for generating microwaves to irradiate the thawing chamber, a vacuum sensor for detecting the vacuum level inside the thawing chamber, an operating unit for operating the vacuum microwave thawing machine, and a control unit for controlling the vacuum microwave thawing machine. The control device is A vacuum microwave thawing machine characterized in that, when a first start operation is performed on the control unit, which is an operation to start the vacuum microwave thawing machine, it is started in a first mode for controlling the thawing of the object to be thawed, and when a second start operation, which is an operation different from the first start operation, is performed on the control unit, it is started in a second mode capable of calibrating the vacuum level sensor.

[0007] The vacuum microwave thawing machine disclosed in this application does not allow calibration of the vacuum level sensor in the first mode activated by the user, and calibration of the vacuum level sensor is only possible when activated in the second mode. Therefore, the vacuum microwave thawing machine disclosed in this application makes it possible to avoid situations in which the vacuum level sensor is calibrated unintentionally. The first and second activation operations are not particularly limited, but it is desirable that the second activation operation be more complex than the first activation operation, for example, by pressing the activation switch while pressing the activation switch, compared to the first activation operation which is simply a matter of pressing the activation switch. Furthermore, it is desirable that the second activation operation be one that is not accidentally performed under normal operating conditions.

[0008] Furthermore, the vacuum microwave thawing machine with the above configuration can be configured in various ways as shown below.

[0009] (2) The operation unit has a display device that displays screens corresponding to the first mode and the second mode, The vacuum microwave thawing machine according to item (1), wherein the vacuum sensor calibration screen, which is a screen for calibrating the vacuum sensor in the second mode, is provided with a calibration value input unit for inputting the calibration value of the vacuum sensor, an on / off valve operation unit for operating an on / off valve that switches between a connected state and a blocked state between the thawing chamber and the outside, and a vacuum pump operation unit for operating and stopping the vacuum pump.

[0010] (3) The operating unit has a start switch for starting the vacuum microwave defroster, The first startup operation is the operation in which the startup switch is pressed when the vacuum microwave thawing machine is energized. The vacuum microwave thawing machine according to item (1) or (2), wherein the second startup operation is an operation in which the vacuum microwave thawing machine is energized while the startup switch is pressed. [Effects of the Invention]

[0011] According to the present invention, in a vacuum microwave thawing machine, it is possible to prevent the calibration of the vacuum level sensor from being performed unintentionally. [Brief explanation of the drawing]

[0012] [Figure 1] Perspective view of the vacuum microwave thawing machine according to the embodiment. [Figure 2] Side cross-sectional view of a vacuum microwave thawing machine [Figure 3] Planar cross-sectional view of a vacuum microwave thawing machine [Figure 4] Front cross-sectional view of a vacuum microwave thawing machine [Figure 5] Block diagram showing the functional configuration of the control unit. [Figure 6]Standby screen in normal mode [Figure 7] Menu screen in factory settings mode [Figure 8] Vacuum degree sensor calibration screen in non-input state [Figure 9] Vacuum degree sensor calibration screen in input-enabled state [Figure 10] Current sensor calibration screen

Mode for Carrying Out the Invention

[0013] <Configuration of Vacuum Microwave Thawing Machine> The configuration of the vacuum microwave thawing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. The vacuum microwave thawing machine 10 of the present embodiment performs heating by microwaves at time intervals in a state where the inside of the thawing chamber R1 is decompressed, so that the heating by microwaves and the sublimation cooling due to the decompressed state are repeated, suppressing the temperature unevenness between the surface and the core part, and thawing without destroying the cells of the food material. In a part of the drawings, the directions are indicated by the symbols F, B, L, R, U, D, which respectively represent the front side (front side), the back side (rear side), the left side, the right side, the upper side, and the lower side when the vacuum microwave thawing machine 10 is viewed from the front.

[0014] The vacuum microwave thawing machine 10 of the present embodiment has a horizontally long rectangular parallelepiped-shaped thawing machine main body 11 that opens forward, a door 12 that opens and closes the thawing chamber R1 arranged on the right side of the thawing machine main body, a front panel 13 that covers the front of the machine chamber R2 arranged on the left side of the thawing machine main body 11, and four casters 14 provided at the four corners on the lower surface of the thawing machine main body. The vacuum microwave thawing machine 10 of the present embodiment has a top plate 15 arranged on the upper surface of the thawing machine main body 11 and is of a table type that can be moved by the four casters 14.

[0015] The thawing machine body 11 has a chamber 20 on its right side. The chamber 20 is a box-shaped body made of metal such as stainless steel and has a substantially rectangular parallelepiped shape with a front opening 21. The door 12 closes the front opening 21 of the chamber 20, and a thawing chamber R1 is formed inside by the chamber 20 and the door 12. The door 12 is rotatable by a hinge 22 provided at the right end on the front side of the thawing machine body and can be opened to the right. By opening the door 12, the object to be thawed can be stored in or taken out of the chamber 20, and by means of a lever 12A provided on the door 12, it can be closed in a state of firmly contacting the chamber 20, and the thawing chamber R1 can be made into a sealed space.

[0016] The chamber 20 is provided with shelf supports 25 for accommodating trays 24 on which the objects to be thawed are placed. The shelf supports 25 are paired left and right and are provided on the side wall surfaces on both sides of the chamber 20. A plurality (four sets in this embodiment) of shelf supports 25 are provided at intervals in the vertical direction. Thereby, a plurality of (four) trays 24 can be accommodated in the chamber 20 along the vertical direction.

[0017] As shown in FIGS. 3 and 4, the vacuum microwave thawing machine 10 of this embodiment includes a vacuum pump (pressure reducer) 30 for decompressing the inside of the chamber 20 (thawing chamber R1), a first regulating valve 32 and a second regulating valve 33 for boosting the pressure in the chamber 20, a microwave generator 34 for generating microwaves, and a control box 36 for accommodating a control board and the like. The microwave generator 34 includes a magnetron 34A for generating microwaves and an inverter 34B for controlling the output of the magnetron 34A. These vacuum pump 30, first regulating valve 32, second regulating valve 33, magnetron 34A, inverter 34B, and control box 36 are arranged in the machine room R2.

[0018] As shown in Figure 4, the vacuum pump 30 is connected to the ceiling of the chamber 20 by piping 37, and sucks air from inside the chamber 20 through piping 37 to reduce the pressure in the thawing chamber R1. On the other hand, the first control valve 32 and the second control valve 33 increase the pressure in the thawing chamber R1 by allowing outside air to flow into the chamber 20. As shown in Figures 3 and 4, the first control valve 32 and the second control valve 33 are connected to piping 38 that extends from the left wall of the chamber 20. Piping 38 is branched, and the first control valve 32 and the second control valve 33 are connected to the ends of each branch. Both the first control valve 32 and the second control valve 33 are solenoid valves, but the first control valve 32 can adjust the flow rate, while the second control valve 33 switches between open and closed. The first control valve 32 is a pressure regulating valve used to restore the pressure in the thawing chamber R1 to a predetermined level during thawing, and the second control valve 33 is an atmospheric release valve used to rapidly introduce outside air into the thawing chamber R1 after thawing is complete, thereby returning the pressure in the thawing chamber R1 to atmospheric pressure. Hereinafter, the first control valve 32 will be referred to as the pressure regulating valve 32, and the second control valve 33 will be referred to as the atmospheric release valve 33.

[0019] The magnetron 34A is located at the rear left of the chamber 20. The magnetron 34A emits microwaves into a metal waveguide 40. The waveguide 40 extends horizontally at the rear of the chamber 20, and its tip is connected to the rear wall of the chamber 20. An irradiation port 42 is formed approximately in the center of the rear wall of the chamber 20, and microwaves propagating through the waveguide 40 are emitted into the chamber 20 from the irradiation port 42. The irradiation port 42 is covered by a lid 44 made of a material that transmits microwaves but blocks the passage of gas, such as glass. This lid 44 allows microwaves to be emitted from the irradiation port 42 into the thawing chamber R1 while the thawing chamber R1 is kept under vacuum.

[0020] The vacuum microwave thawing machine 10 of this embodiment is equipped with three stirrers 50, 52, and 54 for diffusing the microwaves emitted into the thawing chamber R1. The first stirrer 50 and the second stirrer 52 are positioned on the rear wall of the chamber 20, facing each other with the irradiation port 42 in between. The third stirrer 54 is provided on the ceiling wall.

[0021] The control box 36 houses a control device 60 (see Figure 5), which controls the vacuum microwave thawing machine 10 configured as described above. The control device 60 is primarily a computer with a CPU, ROM, and RAM, and is connected to the vacuum pump 30, pressure regulating valve 32, atmospheric release valve 33, microwave generator 34 (more specifically, inverter 34B), three stirrers 50, 52, and 54, etc. By executing various programs stored in the ROM, the connected equipment is controlled.

[0022] Furthermore, a vacuum sensor 66 for detecting the vacuum level, which is the internal pressure of the thawing chamber R1, is provided on the side wall of the chamber 20, as shown in Figure 3, and this vacuum sensor 66 is also connected to the control device 60. In addition, an operation unit 70 is provided on the front panel 13, and this operation unit 70 is also connected to the control device 60. The operation unit 70 mainly consists of an operation board provided on the rear side of the front panel 13, and includes a touch panel type display device 72 and a start switch 74 connected to the operation board.

[0023] Next, the thawing control performed by the control device 60 will be briefly explained. The thawing control first closes the pressure regulating valve 32 and the atmospheric release valve 33, and operates the vacuum pump 30 to reduce the pressure inside the thawing chamber R1. Once the pressure inside the thawing chamber R1 has been reduced to an equilibrium state where the vacuum has converged, the thawing cycle is repeatedly executed. The thawing cycle consists of a microwave heating step in which the pressure regulating valve 32 is opened to a predetermined opening while the internal pressure of the thawing chamber R1 is restored, and microwaves are irradiated into the thawing chamber R1 by the magnetron 34A to heat the object to be thawed, and a sublimation cooling step in which the pressure regulating valve 32 is closed, the pressure inside the thawing chamber R1 is reduced, and the object to be thawed is sublimated and cooled. The sublimation cooling step is performed until the vacuum reaches an equilibrium state. The equilibrium state of the vacuum in the thawing cycle is confirmed based on the detection result of the vacuum sensor 66. Based on the vacuum at this equilibrium state, the remaining thawing time is estimated, and a decision is made on the completion of thawing.

[0024] As the thawing cycle described above is performed, the accuracy of the vacuum sensor 66 that detects the vacuum level is important, and any error in the detection value of this vacuum sensor 66 may lead to a decrease in thawing quality. Therefore, it is desirable that the vacuum sensor 66 be calibrated during periodic maintenance. In addition, the vacuum sensor 66 may be affected by various factors such as the installation of other parts in the chamber 20, the capacity of the vacuum pump 30, and the ambient temperature. For this reason, in general, in the manufacturing process of a vacuum microwave thawing machine, the operation of the vacuum sensor is checked and calibrated after all parts have been assembled.

[0025] In light of the above, the vacuum microwave thawing machine 10 of this embodiment allows the vacuum level sensor 66 to be calibrated from the operation unit 70. However, if the calibration of the vacuum level sensor 66 is unintentionally changed by the user, it may lead to deterioration of thawing quality or malfunction of the machine. Therefore, the vacuum microwave thawing machine 10 of this embodiment is configured to prevent accidental calibration of the vacuum level sensor 66.

[0026] Furthermore, the vacuum microwave thawing machine 10 of this embodiment allows adjustment of the irradiation power of the microwaves generated by the microwave generator 34. Specifically, in the vacuum microwave thawing machine 10 of this embodiment, the display device 72 normally displays the standby screen 80 shown in Figure 6, and the weight of the object to be thawed can be entered into the weight input unit 81. The irradiation power is set to increase in stages as the entered weight increases. The standby screen 80 also includes a thawing level change unit 82 that changes the thawing level when thawing is complete, and the irradiation power is set to increase in stages as the thawing level increases.

[0027] The microwave irradiation power by the microwave generator 34 described above is adjusted by the inverter 34B, which controls the output current to adjust the output of microwaves emitted by the magnetron 34A. The inverter 34B has a current sensor 84 (see Figure 5) and, while detecting the output current, performs feedback control to stabilize the output current and stabilize the output of the magnetron 34A, thereby stabilizing the defrosting quality.

[0028] Generally, current sensors exhibit variations from one unit to another. Therefore, it is necessary to match the detected value of the current sensor 84 with the output of the magnetron 34A. In this embodiment, the vacuum microwave thawing machine 10 allows the current sensor 84 to be calibrated from the operation unit 70. However, if the calibration of the current sensor 84 is unintentionally changed by the user, it may lead to a deterioration in thawing quality or machine malfunction. Therefore, the vacuum microwave thawing machine 10 in this embodiment is configured to prevent accidental calibration of the current sensor 84.

[0029] <Startup Mode> The vacuum microwave thawing machine 10 of this embodiment is normally powered on when used by a user, and is started when the start switch 74 is pressed. Pressing the start switch 74 while the machine is powered on is the first start operation, and when this first start operation is performed, the machine starts in normal mode (first start mode). When starting in normal mode, the control device 60 displays the standby screen 80 shown in Figure 6 on the display device 72 in order to perform thawing control. This standby screen 80 is provided with an equipment setting button 86 for transitioning to a screen for configuring equipment settings related to the vacuum microwave thawing machine 10. However, even if you transition from this function setting button 86, it is not possible to perform the calibration of the vacuum level sensor 66 and the current sensor 84 as described above.

[0030] In the vacuum microwave thawing machine 10 of this embodiment, the vacuum level sensor 66 and the current sensor 84 can be calibrated when the machine is started in a factory setting mode (second startup mode) which is different from the normal mode. The factory setting mode is activated by turning on the circuit breaker or plugging in the power cord while the start switch 74 is pressed, thereby powering on the vacuum microwave thawing machine 10 (control device 60). In other words, the operation of powering on the machine while the start switch 74 is pressed corresponds to the second startup operation. When started in this factory setting mode, the control device 60 displays the factory setting mode menu screen 90 shown in Figure 7 on the display device 72. This menu screen 90 is provided with a vacuum level sensor calibration start button 91 for starting the calibration of the vacuum level sensor 66 and a current sensor calibration start button 92 for starting the calibration of the current sensor 84, allowing the user to calibrate the vacuum level sensor 66 or the current sensor 84. Since the second startup operation described above is not an operation that a user would normally perform, the vacuum microwave defroster 10 of this embodiment can avoid situations in which the vacuum sensor 66 and the current sensor 84 are unintentionally calibrated by the user.

[0031] <Calibration of vacuum sensor> When the vacuum sensor calibration start button 91 is pressed, the vacuum sensor calibration screen 94 shown in Figure 8 is displayed. The vacuum sensor 66 is calibrated by connecting a reference meter to the thawing chamber R1, comparing the value indicated by the reference meter with the value detected by the vacuum sensor 66, and correcting the internal value stored in the control device 60. The vacuum sensor calibration screen 94 has a detection value display unit 95 at the top that displays the value detected by the vacuum sensor 66 (internal value and [hPa] converted value), and a calibration value display unit 96 at the bottom that displays the calibration value of the vacuum sensor 66. The calibration value display unit 96 displays the calibration value 96a when the thawing chamber R1 is at atmospheric pressure and the calibration value 96b when the thawing chamber R1 is in a vacuum state by the vacuum pump 30. These calibration values ​​96a and 96b can be converted to [hPa] units and entered into the calibration value input units 96a1 and 96b1. The entered values ​​are then converted to internal values ​​and displayed as stored values ​​96a2 and 96b2.

[0032] However, immediately after switching to the vacuum sensor calibration screen 94, the calibration value input units 96a1 and 96b1 are in an input-disabled state. Then, when the vacuum level in the thawing chamber R1 reaches an approximate value (for example, ±5 hPa) and this state persists for a set time (for example, 2 minutes), the calibration value input units 96a1 and 96b1 become input-enabled, as shown in Figure 9. This makes it possible to input stable calibration values ​​regardless of the operator, thereby stabilizing the thawing quality of the vacuum microwave thawing machine 10 of this embodiment.

[0033] Furthermore, the vacuum sensor calibration screen 94 is equipped with a vacuum pump operation unit 97 for switching the vacuum pump 30 ON and OFF, and a valve operation unit (on / off valve operation unit) 98 for switching the atmospheric release valve 33, which acts as an on / off valve, open and close. This allows the operator to manually create a vacuum in the thawing chamber R1 from the vacuum sensor calibration screen 94. Therefore, the vacuum microwave thawing machine 10 of this embodiment allows for calibration of the vacuum sensor 66 without transitioning from the vacuum sensor calibration screen 94 to other screens, enabling efficient calibration work.

[0034] <Calibration of current sensor> When the current sensor calibration start button 92 is pressed, the current sensor calibration screen 100 shown in Figure 10 is displayed on the display device 72. The calibration of the current sensor 84 is to match the current value detected by the current sensor 84 with the output of the magnetron 34A. Specifically, when the inverter 34B is operated and a specific magnitude of output is produced from the magnetron 34A, the value detected by the current sensor 84 at that time is taken as the calibration value of the current sensor 84.

[0035] The current sensor calibration screen 100 is equipped with an inverter operation unit 101 for operating the inverter 34B. More specifically, the inverter operation unit 101 consists of a drive operation unit 102 for switching the inverter 34B ON and OFF, and an output instruction unit 103 for switching the output of the inverter 34B between high output and low output. The current sensor calibration screen 100 is also equipped with a detection value display unit 104 at the top that displays the value detected by the current sensor 84 (internal value and [A] converted value), and a calibration value display unit 105 at the bottom that displays the calibration value of the current sensor 84. The calibration value display unit 105 displays a calibration value 105a corresponding to high output and a calibration value 105b corresponding to low output. These calibration values ​​105a and 105b can be converted to [A] units and entered into the calibration value input units 105a1 and 105b1. The entered values ​​are then converted to internal values ​​and displayed as stored values ​​105a2 and 105b2.

[0036] For example, let's consider the case where a calibration value input unit 105a1 corresponding to high output is input, as shown in Figure 10. In this case, the drive operation unit 102 is turned ON, and the output instruction unit 103 is also turned ON to operate the inverter 34B at high output. The detected value of the current sensor 84 is then displayed on the detected value display unit 104. This detected value is then input to the calibration value input unit 105a1 corresponding to high output. Similarly, the calibration value for the low output side is input, and the calibration of the current sensor 84 is completed. The detected value display unit 104 is configured to display the average value within a set time (for example, 3.0 sec). This reduces the variation in the displayed current value, suppresses the variation in the input calibration value, and stabilizes the output of the microwave generator 34.

[0037] Furthermore, in this embodiment, the vacuum microwave thawing machine 10 allows the operator to manually operate the microwave generator 34 from the current sensor calibration screen 100. Therefore, in this embodiment, the vacuum microwave thawing machine 10 makes it possible to calibrate the current sensor 84 without switching from the current sensor calibration screen 100 to other screens, enabling efficient calibration work.

[0038] <Functional Configuration of Control Device> The control device 60 that performs the above-mentioned control has a functional configuration as shown in the block diagram in Figure 5 and has various functional parts. More specifically, it includes a defrosting control execution unit 120 that performs the above-mentioned defrosting control, a normal mode startup unit 122 that starts the device in normal mode (first mode) when a first startup operation is performed, and a factory setting mode startup unit 124 that starts the device in factory setting mode (second mode) when a second startup operation is performed. The factory setting mode startup unit 124 is composed of a vacuum sensor calibration unit 126 that calibrates the vacuum sensor 66 and a current sensor calibration unit 128 that calibrates the current sensor 84.

[0039] <Other Embodiments> The present invention is not limited to the embodiments described above, and can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art. For example, the following embodiments are also included within the technical scope of the present invention.

[0040] In the above embodiment, the second starting operation was defined as pressing the starting switch 74 in the normal power state, but it is not limited to this. For example, a separate switch from the starting switch 74 can be provided, and the operation can be defined as pressing the starting switch 74 while the separate switch is pressed. However, it is desirable that the second starting operation be more complex than the first starting operation so that it is not accidentally operated in the normal operating state.

[0041] In the above embodiment, the vacuum sensor calibration screen 94 was configured to be accessed from the menu screen 90 of the factory setting mode. However, the vacuum sensor calibration screen 94 may be directly displayed on the display device 72 by a second startup operation. [Explanation of Symbols]

[0042] 10... Vacuum microwave thawing machine, 30... Vacuum pump [pressure reducer], 33... Second control valve (atmospheric release valve) [on / off valve], 60... Control device, 66... ​​Vacuum level sensor, 70... Operation unit, 72... Display device, 74... Start switch, 94... Vacuum level sensor calibration screen, 96a1, 96b1... Calibration value input unit, 97... Vacuum pump operation unit, 98... Valve operation unit [on / off valve operation unit]

Claims

1. A vacuum microwave thawing machine, The vacuum microwave thawing machine comprises a thawing chamber for containing the object to be thawed, a vacuum pump for reducing the pressure inside the thawing chamber, a microwave generator for generating microwaves to irradiate the thawing chamber, a vacuum sensor for detecting the vacuum level inside the thawing chamber, an operating unit for operating the vacuum microwave thawing machine, and a control unit for controlling the vacuum microwave thawing machine. The control device is A vacuum microwave thawing machine characterized in that, when a first start operation is performed on the control unit, which is an operation to start the vacuum microwave thawing machine, it is started in a first mode for controlling the thawing of the object to be thawed, and when a second start operation, which is an operation different from the first start operation, is performed on the control unit, it is started in a second mode capable of calibrating the vacuum level sensor.

2. The operation unit has a display device that displays screens corresponding to the first mode and the second mode, The vacuum microwave thawing machine according to claim 1, wherein the vacuum sensor calibration screen, which is a screen for calibrating the vacuum sensor in the second mode, is provided with a calibration value input unit for inputting the calibration value of the vacuum sensor, an on / off valve operation unit for operating an on / off valve that switches between a communication state and a blocked state between the thawing chamber and the outside, and a vacuum pump operation unit for operating and stopping the vacuum pump.

3. The operating unit has a start switch for starting the vacuum microwave thawing machine. The first startup operation is the operation in which the startup switch is pressed when the vacuum microwave thawing machine is energized. The vacuum microwave thawing machine according to claim 1 or claim 2, wherein the second startup operation is an operation in which the vacuum microwave thawing machine is energized while the startup switch is pressed.

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