JP4301832B2 - Vacuum microwave thawing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum microwave thawing machine for thawing food or the like based on irradiation of microwaves in a decompression state in a thawing chamber.
[0002]
[Problems to be solved by the invention]
In the vacuum microwave thawing machine, as shown in FIG. 11, the rubber packing 101 is fixed to the door 100, and the rubber packing 101 is pressed against the flange 103 of the thawing chamber 102 when the door 100 is closed. There is a configuration in which the thawing chamber 102 is sealed in an airtight state. In the case of this configuration, the metal wire tube 104 is fixed to the door 100, and the metal wire tube 104 is pressed against the flange 103 of the thawing chamber 102 in the closed state of the door 100, and electromagnetic sealing is performed based on elastic deformation. It was. For this reason, when closing the door 100, since the big operation force which elastically deforms the metal wire tube 104 is required, it is difficult to perform the closing operation of the door 100.
This invention is made | formed in view of the said situation, The objective is to provide the vacuum microwave defroster which can improve the obstruction | occlusion operativity of a door, without impairing the electromagnetic sealing property of a microwave.
[0003]
[Means for Solving the Problems]
<About the Invention of Claim 1>
  The invention according to claim 1A thawing chamber for storing a thawing product, the thawing chamber having a front opening on the user side, and a front door for opening and closing the front surface of the thawing chamber. A door having a plate and a door front plate facing the door plate from the front, a microwave generator for irradiating microwaves into the thawing chamber, and electromagnetically sealing microwaves in the closed state of the door 1) an attachment portion provided on the door plate of the door; and 2) after the attachment portion so as to be inserted into the thawing chamber from the front in the closed state of the door. 3) A frame-shaped first portion that circulates toward the door plate, and 3) faces the first portion from the outer peripheral side through a gap, and faces the door plate of the door from behind. The doors are opposed to each other, and the door is closed. 4) The outer plate portion inserted from the front into the thawing chamber and 4) the first portion and the outer plate portion are connected to each other, and are inserted from the front into the thawing chamber with the door closed. And 2) the first part, 3) the outer plate part, 4) a choke member in which a choke groove is formed between the second parts, and the choke member provided on the door, It seals the gap between the outer plate part and the door plate of the door, and the outer peripheral surface faces the inner peripheral surface of the thawing chamber by being inserted into the thawing chamber from the front with the door closed. A frame-shaped first seal member; a decompressor that depressurizes the thawing chamber based on driving in the closed state of the door; and a second seal member that seals the thawing chamber in the closed state of the door. The outer peripheral surface of the first seal member is a closed shape of the door In characterized in that it forms a slope shape inclined toward the inner peripheral side toward the front-to-back.
  According to the first aspect of the present invention, since microwave leakage is prevented by the choke member, a metal wire tube for electromagnetic sealing becomes unnecessary. For this reason, since it is not necessary to elastically deform the metal wire tube when closing the door, the door closing operation is facilitated. In addition, since the opening of the choke member is closed by the seal member, moisture does not enter the choke groove. For this reason, since it is not necessary to discharge | emit the water | moisture content vaporized based on the pressure_reduction | reduced_pressure of a thawing chamber, a decompression | restoration chamber is pressure-reduced rapidly.
  For example, when the thawing chamber is opened and closed based on the turning operation of the door, the outer peripheral surface of the first seal member does not interfere with the inner surface of the thawing chamber. And since the door side edge part of a 1st seal member is thickened, the rigidity in the case of fixing a 1st seal member to the door side improves, for example.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 2, the cabinet 1 has a vertical box shape, and a base of a plurality of casters 2 is fixed to the lower plate of the cabinet 1. A space-like storage part 3 for storing mechanical parts and electrical parts is formed below the cabinet 1, and a door 4 is attached to the front end part of the cabinet 1. The door 4 is attached to the cabinet 1 via a hinge (not shown) and is rotatable about a vertical axis on the right side.
[0009]
As shown in FIG. 1, the door 4 is composed of a vertical door plate 5 and a container-like door front plate 6 having an opening on the rear surface. A plurality of screws 7 are fastened to the door front plate 6 through the plate 5. As shown in FIG. 2, a handle 8 is mounted on the front surface of the door 4 at the left end, and the handle 8 is rotatable about a shaft 8a extending in the front-rear direction. A plurality of operation switches 9 are fixed to the upper end portion of the door 4.
[0010]
A lock mechanism (not shown) is mechanically connected to the handle 8, and when the handle 8 is rotated with the door 4 closed, the lock plate of the lock mechanism is engaged in the lock hole of the cabinet 1. Then, the door 4 is locked in a non-rotatable state by the engagement force between the lock plate and the lock hole, and is closed. The hinge of the door 4 is movable in the front-rear direction, and the door 4 moves rearward by the engagement force between the lock plate and the lock hole based on the closed state.
[0011]
As shown in FIG. 3, a chamber 10 constituting a thawing chamber is fixed above the cabinet 1. The chamber 10 is made of a metal pressure-resistant container having an opening 11 on the front surface, and the opening 11 is opened and closed based on manual operation of the door 4 by a handle 8. A flange-like chamber front plate 12 that circulates around the chamber 10 is bent at the front end of the chamber 10.
[0012]
A table drive motor 13 with a speed reducer is fixed to the storage unit 3. A support shaft 14 is connected to the output shaft of the table drive motor 13, and the upper end portion of the support shaft 14 penetrates the lower plate (bottom plate) of the chamber 10 and projects into the chamber 10. A circular dish-shaped turntable 15 is detachably mounted on the upper end of the support shaft 14 at the bottom of the chamber 10, and the turntable 15 is rotationally driven by a table drive motor 13. Reference numeral 16 denotes a bearing that rotatably supports the support shaft 14.
[0013]
A magnetron 17 corresponding to a microwave generator, a vacuum pump 18 corresponding to a decompressor, and a discharge detection sensor 19 are mechanically connected to the rear plate of the chamber 10. In addition, an atmosphere release valve 20, a pressure regulating valve 21, and a vacuum pressure sensor 22 are mechanically connected to the upper plate of the chamber 10.
[0014]
The magnetron 17 is fixed to the rear plate of the chamber 10 through the waveguide 23, and irradiates microwaves into the chamber 10 through the waveguide 23. The vacuum pump 18 uses a pump drive motor 24 as a drive source, and depressurizes the inside of the chamber 10 based on discharging the air in the chamber 10 from a hole formed in the rear plate of the chamber 10. The discharge detection sensor 19 detects the presence or absence of discharge in the chamber 10, and is mainly composed of an optical sensor that detects the presence or absence of discharge light.
[0015]
The air release valve 20 is composed of a solenoid valve that switches between a valve open state and a valve closed state. The inside of the chamber 10 communicates with the outside based on switching from the valve closed state to the valve open state, and the pressure is reduced. The inside of a certain chamber 10 is returned to atmospheric pressure. The pressure regulating valve 21 incorporates an opening degree adjusting mechanism using a motor as a drive source, and the opening degree adjusting mechanism adjusts the degree of opening of the pressure regulating valve 21 according to the rotation amount of the motor. The vacuum pressure sensor 22 detects the internal pressure of the chamber 10 and outputs an electric signal at a level corresponding to the detected pressure.
[0016]
As shown in FIG. 1, a choke member 25 made of a ferromagnetic material is fixed to the rear surface of the door plate 5. The choke member 25 electromagnetically seals the microwave when the door 4 is closed, and prevents the microwave from leaking from the joint between the chamber front plate 12 and the door plate 5.
[0017]
The choke member 25 has a frame shape that circulates around the outer peripheral portion of the door plate 5. The choke member 25 is inserted into the front end portion of the chamber 10 when the door 4 is closed, and faces the inner peripheral surface of the chamber 10 via a gap. . The choke member 25 has a mounting portion 26 welded to the rear surface of the door plate 5 and a main body portion 27 having a substantially rectangular frame shape and a rectangular frame shape as a whole. A groove 28 is formed. The main body 27 is formed with a plurality of spatial notches 29 at an equal pitch. These cutout portions 29 are formed in the outer plate portion 30 constituting a part of the main body portion 27. The outer plate portion 30 is opposed to the inner peripheral surface of the chamber 10 and is formed in a comb shape due to the presence of the plurality of notches 29.
[0018]
The door plate 5 is formed with a concave inner circumferential groove 31 (hereinafter referred to as a choke groove 31). The choke groove 31 has a frame shape that goes around the door plate 5, and a front end portion of the choke packing 32 is fitted in the choke groove 31. The choke packing 32 corresponds to a first seal member.
[0019]
A first protrusion 33 is integrally formed on the inner peripheral surface of the choke packing 32, and the first protrusion 33 is fitted into the first opening 34 of the choke member 25 (see FIG. 1). ing. The first opening 34 refers to a space formed between the front end surface of the outer plate 30 and the door plate 5. The first protrusion 33 exhibits an elastic restoring force based on being fitted and compressed between the front end surface of the outer plate portion 30 and the inner surface of the choke groove 31, and the outer plate is caused by this elastic restoring force. The first opening 34 is sealed in an airtight state in close contact with the front end surface of the portion 30 and the inner surface of the choke groove 31.
[0020]
As shown in FIG. 4B, a plurality of second protrusions 35 are integrally formed at an equal pitch on the inner peripheral surface of the choke packing 32, and each second protrusion 35 is shown in FIG. In this manner, the choke member 25 is fitted into the second opening 36. Each of these second openings 36 refers to the internal space of the notch 29, and the second protrusion 35 is elastic on the basis of being fitted and compressed on the inner peripheral surface of the second opening 36. A restoring force is exerted, and the second opening 36 is sealed in an airtight state by being in close contact with each other by the elastic restoring force. That is, the choke packing 32 has both the fitting force between the first projecting portion 33 and the first opening portion 34 and the fitting force between the second projecting portion 35 and the second opening portion 36, and the choke member 25. It is held in.
[0021]
A face seal portion 37 is formed on the chalk packing 32. The surface seal portion 37 refers to a portion that contacts the outer peripheral surface of the outer plate portion 30 of the choke packing 32, and the surface seal portion 37 is formed by the holding force of the choke packing 32 against the choke member 25 of the outer plate portion 30. It is in close contact with the outer peripheral surface in an airtight state. That is, the choke packing 32 seals all the openings 34 and 36 of the choke member 25 in an airtight state that exceeds the watertight state.
[0022]
As shown in FIG. 4A, the chalk packing 32 is formed with an inclined surface 38. The inclined surface 38 is opposed to the inner peripheral surface of the chamber 10 and is inclined toward the choke member 25 side from the front to the rear. That is, the thickness of the choke packing 32 decreases from the front end portion toward the rear end portion, and the door plate 5 is based on fitting the thickest portion 39 of the front end portion into the choke groove 31. It is fixed to. The thickness of the thickest portion 39 is constant.
[0023]
As shown in FIG. 1, the door plate 5 is formed with a concave outer peripheral groove portion 40 (hereinafter referred to as a chamber groove 40) located on the outer periphery of the choke groove 31. The chamber groove 40 has a frame shape that goes around the door plate 5, and the front end portion of the chamber packing 41 is fitted into the chamber groove 40. The chamber packing 41 corresponds to a second seal member.
[0024]
A frame-like seal portion 56 is integrally formed on the rear surface of the chamber packing 41. The seal portion 56 has a convex cross section and is compressed between the inner surface of the chamber groove 40 and the chamber front plate 12 based on the closing of the door 4. The chamber 10 is sealed in an airtight state based on tight contact with the inner surface of the chamber groove 40 and the chamber front plate 12 by an elastic restoring force. When the inside of the chamber 10 is depressurized in this state, the door 4 moves rearward due to the pressure difference between the inside and outside, so that the degree of adhesion of the seal portion 42 to the chamber front plate 12 is further increased, and the air density inside the chamber 10 is improved.
[0025]
The choke packing 32 and the chamber packing 41 are formed by using silicon 42 as a material. As shown in FIG. 5A, in the forming die 45 including the upper die 43 and the lower die 44, the lower die 44 is formed. It is formed by so-called rubber molding in which the silicon 42 is placed on top and the silicon 42 is crushed between the upper mold 43 and the lower mold 44 as shown in FIG. When the upper die 43 and the lower die 44 are clamped, a cavity 32 a for the choke packing 32 and a cavity 41 a for the chamber packing 41 are formed between the upper die 43 and the lower die 44. Since the cavities 32a and 41a are communicated by the runner 46, the silicon 42 flows between the cavities 32a and 41a.
[0026]
In the cabinet 1, as shown in FIG. 6, a control device 60 composed mainly of a microcomputer is disposed. The control device 60 has a CPU, ROM, RAM, and I / O, and a signal output circuit 61 is electrically connected to an input terminal of the control device 60. The signal output circuit 61 is electrically connected to a plurality of operation switches 9, a discharge detection sensor 19, and a vacuum pressure sensor 22, and output signals from these are given to the operation signal of the control device 60 through the signal output circuit 61. .
[0027]
The control device 60 is electrically connected to the table drive motor 13, the magnetron 17, the atmosphere release valve 20, the pressure regulating valve 21, and the pump drive motor 24 via a drive control circuit 62. The control device 60 includes a plurality of operation switches. 9. The table drive motor 13 to the pump drive motor 24 are driven and controlled based on the output signals from the discharge detection sensor 19 and the vacuum pressure sensor 22 to control the vacuum thawing operation of the food. This vacuum thawing operation is performed by the control device based on an operation control program recorded in advance in the ROM, and details of the vacuum thawing operation will be described below with reference to FIG.
[0028]
When the control device 60 detects that the operation switch 9 is started in the closed state of the door 4, the control device 60 drives the vacuum pump 18 with the atmospheric release valve 20 and the pressure regulating valve 21 closed and completely closed. Then, the vacuum pump 18 sucks the air in the chamber 10 and evacuates it based on reducing the pressure in the chamber 10. The chamber 10 is depressurized from an atmospheric pressure of approximately 101 [kPa] (reference value: 760 [Torr]), and the control device 60 continues the vacuum pump 18 until the internal pressure of the chamber 10 reaches the decompression equilibrium region F. The depressurization process is performed based on the specific driving, and the thawing product is pre-thawed based on the depressurization process. The decompression equilibrium region F is a region where the decompression amount ΔP per unit time becomes “0”, and the equilibrium pressure in the decompression equilibrium region F increases and decreases depending on the saturated vapor pressure in the chamber 10.
[0029]
The control device 60 detects the pressure signal from the vacuum pressure sensor 22 in the driving state of the vacuum pump 18, and calculates the pressure reduction amount ΔP based on the detection result of the pressure signal. Then, it is determined whether or not the inside of the chamber 10 has reached the decompression equilibrium region F based on comparing the decompression amount calculation result ΔP with the reference value. Here, when it is determined that the internal pressure of the chamber 10 reaches the decompression equilibrium region F, the driving of the vacuum pump 18 is stopped, and the chamber 10 is opened based on opening the pressure regulating valve 21 to the set opening degree while the driving of the vacuum pump 18 is stopped. Is increased from the decompression equilibrium region F.
[0030]
The control device 60 detects the internal pressure of the chamber 10 with the pressure regulating valve 21 open, and compares the detection result of the internal pressure with a lower limit value P1 (for example, about 1.3 [kPa] (reference value: 10 [Torr]). The lower limit value P1 corresponds to a limit value that does not cause vacuum discharge even when the chamber 10 is irradiated with microwaves, and the control device 60 has reached point C where the detection result of the internal pressure exceeds the lower limit value P1. Is detected, the chamber 10 is irradiated with microwaves based on the start of driving of the magnetron 17.
[0031]
The control device 60 detects the internal pressure of the chamber 10 while the magnetron 17 is driven, and compares the internal pressure detection result with a return pressure upper limit value P2 {eg, about 6.7 [kPa] (reference value: 50 [Torr])}. . Here, when it is detected that the detection result of the internal pressure has reached the return pressure upper limit value P2, the pressure regulating valve 21 is completely closed, and the decompression process in the chamber 10 is performed based on the reactivation of the vacuum pump 18 in this fully closed state. Run again.
[0032]
The control device 60 detects the internal pressure of the chamber 10 while the vacuum pump 18 is re-driven, and compares the detection result of the internal pressure with the lower limit value P1. Here, when it is detected that the detection result of the internal pressure has reached the lower limit value P <b> 1, the microwave irradiation is finished based on stopping the driving of the magnetron 17. When it is detected that the internal pressure of the chamber 10 has reached the decompression equilibrium region F, the vacuum pump 18 is stopped and the above series of operations are repeated. Then, since the saturated vapor pressure in the chamber 10 increases based on the temperature rise of the thawed product, the pressure reduction value ΔP becomes “0” at a high internal pressure. The control device 60 compares the internal pressure when the pressure reduction value ΔP becomes “0” with the thawing end value, and when detecting that the internal pressure has increased to the thawing end value, opens the air release valve 20 and finishes the thawing operation. .
[0033]
According to the first embodiment, since the microwave leakage is prevented by the choke member 25, the metal wire tube 104 for electromagnetic sealing becomes unnecessary. For this reason, when the door 4 is operated with the handle 8 and the chamber 10 is closed, it is not necessary to elastically deform the metal wire tube 104, so that the door 4 can be easily closed. In addition, since the openings 34 and 36 of the choke member 25 are closed by the choke packing 32, moisture does not enter the choke groove 28. For this reason, since it is not necessary to discharge | emit the water | moisture content vaporized based on the pressure_reduction | reduced_pressure of the chamber 10, the inside of a thawing chamber is pressure-reduced rapidly.
[0034]
The choke packing 32 and the chamber packing 41 are made of the same silicon 42. For this reason, the choke packing 32 and the chamber packing 41 can be simultaneously molded using the common mold 45, so that productivity is improved.
[0035]
Further, the choke packing 32 is fitted into the choke groove 31 of the door plate 5, the first opening 34 of the choke member, and the second opening 36 of the choke member 25. 4, and the positional relationship with respect to the choke member 25 is stabilized. Moreover, in the reduced pressure state of the chamber 10, a pulling-out force in the diameter increasing direction acts on the choke packing 32 due to the difference between the internal pressure of the choke groove 28 and the internal pressure of the chamber 10, but the choke packing 32 is the choke of the door plate 5. Since it is fitted in the groove 31 for use, it is prevented from coming off from the choke member 25.
[0036]
Further, an inclined surface 38 is provided on the outer peripheral surface of the choke packing 32. For this reason, when the chamber 10 is opened and closed based on the turning operation of the door 4, the outer peripheral surface 38 of the choke packing 32 does not interfere with the inner peripheral surface of the chamber 10. In addition, since the front end portion of the choke packing 32 is thickened, the rigidity of the front end portion is improved. For this reason, the choke packing 32 is not easily deformed from the root portion in the pulling direction due to the pulling-out force in the expanding direction that is received by the pressure difference between the inside and the outside, so that the choke packing 32 may fall off the choke member 25 in a reduced pressure state. It is surely prevented.
[0037]
Next, a second embodiment of the present invention will be described with reference to FIG.
A face seal portion 56 is formed integrally with the chamber packing 41. The face seal portion 56 has a conical cylindrical shape that expands toward the rear, and is elastically deformed into an expanded state based on being pressed against the chamber front plate 12 when the door 4 is closed, The chamber 10 is hermetically sealed by surface contact with the plate 12 by elastic restoring force. In the case of this configuration, there is an advantage that the chamber packing 41 completely contacts the chamber front plate 12 to increase the sealing area.
[0038]
In the first and second embodiments, the choke packing 32 and the chamber packing 41 are fixed to the door 4 side. However, the present invention is not limited to this. For example, the choke packing 32 and the chamber packing 41 may be fixed to the chamber 10 side. Also good.
In the first to second embodiments, the choke packing 32 and the chamber packing 41 are made of the same material. However, the present invention is not limited to this, and may be made of different materials, for example. .
[0039]
Next, a third embodiment of the present invention will be described with reference to FIG.
A concave groove 80 is formed in the door plate 5. The groove portion 80 has a frame shape that circulates around the door plate 5, and a front end portion of a silicon rubber packing 81 having a frame shape is fitted into the groove portion 80. The packing 81 is obtained by integrating the first protrusion 82, the plurality of second protrusions 83, and the protrusion 84, that is, the chalk packing 32 and the chamber packing 41 are integrated. The protrusion 82 and the second protrusion 83 are fitted into the first opening 34 and the second opening 36 of the choke member 25, respectively. The second opening 36 is sealed in an airtight state, and the protrusion 84 seals the chamber 10 in an airtight state based on being compressed when the door 4 is closed.
[0040]
That is, the packing 81 integrates the choke packing 32 that seals the first opening 34 and the second opening 36 of the choke member 25 in an airtight state, and the chamber packing 41 that seals the chamber 10 in an airtight state. Is.
[0041]
According to the third embodiment, the chalk packing 32 and the chamber packing 41 are integrated. For this reason, there is no need to individually grip the chalk packing 32 and the chamber packing 41 and assemble them into the choke member 25 and the door plate 5. Since it can be attached, assembly workability is improved.
[0042]
A fourth embodiment of the present invention will be described with reference to FIG.
A front end portion of a silicone rubber packing 90 is fitted in the groove portion 80. The packing 90 is an integral part of the choke packing 32 and the chamber packing 41, and has a first protrusion 33, a plurality of second protrusions 35, an inclined surface 38, and a seal part 42. is doing. An inclined surface 91 is formed on the inner peripheral surface of the groove 80. The inclined surface 91 is reduced in diameter toward the front, and the packing 90 is formed with an inclined portion 93 that is in surface contact with the inclined surface 91.
[0043]
According to the fourth embodiment, the inclined portion 93 and the inclined surface 91 are formed in the packing 90 and the groove portion 80. For this reason, since the inclined portion 93 is locked to the inclined surface 91 when a pulling force is applied to the packing 90 in a reduced pressure state of the chamber 10, the packing 90 is reliably prevented from being removed from the groove portion 80.
[0044]
In the third to fourth embodiments, the choke packing 32 and the chamber packing 41 are integrated based on the integral molding. However, the present invention is not limited to this. Then, they may be integrated based on welding, adhesion, engagement, or the like.
In the first to fourth embodiments, the choke packing 32, the chamber packing 41, and the packings 81 and 90 are made of silicon rubber. However, the present invention is not limited to this. For example, fluorine rubber, and You may comprise from another rubbers, such as natural rubber, and may comprise from the elastomer which is a composite material of a plastic and rubber | gum.
[0045]
In the first to fourth embodiments, the first opening 34 and the second opening 36 of the choke member 25 are sealed in an airtight state by the choke packing 32 and the packings 81 and 90. However, the present invention is not limited to this, and for example, it may be sealed in a watertight state that prevents moisture from entering.
In the first to fourth embodiments, a comb-like member having a plurality of notches 29 is used as the choke member 25. However, the present invention is not limited to this. For example, the notch 29 exists. A non-comb-like one may be used.
[0046]
Moreover, in the said 1st-4th Example, although the choke member 25 was made to protrude with respect to the rear surface of the door plate 5, it is not limited to this, For example, it is non-restricted with respect to the rear surface of the door plate 5. You may provide in a protruding state. In this case, the choke member 25 may be disposed in front of the chamber front plate 12.
Moreover, in the said 1st-4th Example, although the choke member 25 was fixed to the door plate 5, it is not limited to this, For example, you may fix to the chamber 10. FIG.
[0047]
Moreover, in the said 1st-4th Example, although the lock mechanism which locks the door 4 in the closed state was used, it is not limited to this, For example, a lock mechanism is abolished and the door 4 is made inside and outside. You may lock in the closed state based on moving backward by the differential pressure of.
In the first to fourth embodiments, the choke packing 32 and the packings 81 and 90 are fitted into the first opening 34 and the second opening 36 of the choke member 25 so that the airtight state is achieved. However, the present invention is not limited to this, and may be sealed in a watertight state based on, for example, bonding to the surface of the choke member 25 or fixing with a tape or the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention (cross-sectional view taken along the X-ray in FIG. 2).
FIG. 2 is a front view showing the overall configuration.
FIG. 3 is a diagram showing the internal configuration of the outer box
4A and 4B show choke packings, where FIG. 4A is a cross-sectional view, and FIG. 4B is a perspective view.
FIG. 5 is a view showing a molding die for choke packing and chamber packing.
FIG. 6 is a block diagram showing an electrical configuration.
FIG. 7 is a diagram showing the operation contents of thawing cooking
FIG. 8 is a sectional view of a chamber packing according to a second embodiment of the present invention.
FIG. 9 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.
FIG. 10 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention.
11 is a view corresponding to FIG. 1 showing a conventional example.
[Explanation of symbols]
4 is a door, 10 is a chamber (thawing chamber), 17 is a magnetron (microwave generator), 18 is a vacuum pump (decompressor), 25 is a choke member, 31 is a choke groove (groove), and 32 is a choke packing. (First seal member) 34 is a first opening (opening), 36 is a second opening (opening), and 41 is a chamber packing (second sealing member).

Claims (1)

A thawing chamber in which a thawing product is stored and a front side which is a user side is opened ,
Opening and closing the front surface of the thawing chamber, a door having a door plate that closes the front surface of the thawing chamber from the front in a closed state and a door front plate facing the door plate from the front ,
A microwave generator for irradiating microwaves into the thawing chamber;
It is provided on the door and electromagnetically seals microwaves when the door is closed, and has the following 1) mounting portion, 2) first portion, 3) outer plate portion, and 4) second portion. And 2) a first portion, 3) an outer plate portion, and 4) a choke member in which a choke groove is formed between the second portions ,
1) Mounting portion provided on the door plate of the door
2) A frame-shaped first that is provided in the attachment portion and extends rearward from the attachment portion so as to be inserted into the thawing chamber from the front in the closed state of the door, and circulates the door plate. portion
3) Forming a frame shape that opposes the first portion from the outer peripheral side through a gap and opposes the door plate of the door from behind through a gap, and the thawing chamber is closed when the door is closed. The outer plate part inserted from the front
4) A second part that connects the first part and the outer plate part and is inserted from the front into the thawing chamber in a closed state of the door.
It is provided in the door and seals the gap between the outer plate portion of the choke member and the door plate of the door, and the outer peripheral surface is inserted from the front into the thawing chamber in the closed state of the door. A frame-shaped first seal member facing the inner peripheral surface of the thawing chamber ;
A decompressor for decompressing the thawing chamber based on driving in the closed state of the door;
A second sealing member for sealing the thawing chamber in a closed state of the door ,
The vacuum microwave defroster , wherein an outer peripheral surface of the first seal member is inclined to an inner peripheral side from the front to the rear in the closed state of the door .

Images