Commercial pressure rice cooker

Abstract

To provide a pressure rice cooker for business use that can adjust a discharge rate of steam from a rice cooking pot.SOLUTION: A pressure rice cooker for business use comprises: a rice cooking pot 3; a lid 4 covering an opening part of the rice cooking pot 3, and provided with a steam release hole 21 for discharging steam in the rice cooking pot 3; and a pressure adjustment mechanism 50 to be press-fitted around the steam release hole 21, and capable of adjusting pressure in the rice cooking pot 3. The pressure adjustment mechanism 50 comprises an exhaust hood 28 to be press-fitted around the steam release hole 21, and an exhaust adjustment member 52 capable of adjusting a discharge rate of steam in the exhaust hood 28.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a commercial pressure rice cooker that is mainly used for commercial purposes. [Background technology]

[0002] A conventional commercial pressure rice cooker (Patent Document 1) discloses a commercial pressure rice cooker that can exhaust steam from the rice cooker pot to a predetermined location such as outdoors without providing a suction device, etc. In this commercial pressure rice cooker, the amount of steam exhausted is regulated to a constant amount by an exhaust passage that is always open, and there is no problem as long as the rice cooker pot is used to cook the designed amount of rice. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-010914 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the rice cooking plan for that day requires only about half a pot of rice, the conventional commercial pressure rice cooker described in Patent Document 1 cooks one pot of rice and the remaining half of the rice that is not needed has to be disposed of. In other words, there is loss due to disposal, loss of rice polishing, and loss of more gas and electricity than necessary, and these potential losses have become a major long-term issue for rice cooking factories.

[0005] Furthermore, although it is not impossible to cook about half a pot of rice using a conventional commercial pressure rice cooker, because the amount of rice being cooked is small, it is difficult to increase the pressure, resulting in differences from normal cooking.

[0006] Furthermore, conventional commercial pressure rice cookers do not allow you to adjust the pressure inside the rice cooker, such as choosing whether or not to pressurize the rice depending on the purpose of the rice (i.e. whether or not to make the rice sticky).

[0007] In view of the above problems, the present invention aims to provide a commercial pressure rice cooker that is capable of adjusting the amount of steam discharged from the rice cooker. [Means for solving the problem]

[0008] The invention pertaining to (1) is a commercial pressure rice cooker comprising at least a rice cooker, a lid that covers the opening of the rice cooker and has a steam vent hole for discharging steam from inside the rice cooker, and a pressure adjustment mechanism that can be pressed around the steam vent hole to adjust the pressure inside the rice cooker, wherein the pressure adjustment mechanism comprises an exhaust hood that is pressed around the steam vent hole and an exhaust adjustment member that can adjust the amount of steam discharged inside the exhaust hood.

[0009] The invention related to (2) is the commercial pressure cooker described in (1) above, in which the exhaust hood comprises a preliminary pressurized chamber capable of retaining steam discharged from the steam vent, an exhaust passage that is connected to the preliminary pressurized chamber and is capable of discharging steam from the preliminary pressurized chamber to the outside of the machine, and an exhaust adjustment cylinder that is capable of adjusting the position of the exhaust adjustment member relative to the exhaust passage, and the exhaust adjustment member is capable of arbitrarily adjusting the amount of steam discharged through the exhaust passage.

[0010] The invention related to (3) is a commercial pressure rice cooker described in (2) above, in which the exhaust adjustment member comprises an extendable rod that moves back and forth by the exhaust adjustment cylinder, and a rod tip portion at the end of the extendable rod, and the rod tip portion has a diameter larger than the diameter of the exhaust passage.

[0011] The invention related to (4) is the commercial pressure rice cooker described in (2) above, in which the exhaust adjustment member comprises an extendable rod that moves back and forth by the exhaust adjustment cylinder, and a rod tip portion at the end of the extendable rod, and the rod tip portion has a shape that tapers more than the diameter of the exhaust passage.

[0012] The invention related to (5) is the commercial pressure rice cooker described in (1) above, in which the exhaust hood comprises a preliminary pressurizing chamber capable of retaining steam discharged from the steam vent hole, an exhaust passage that is connected to the preliminary pressurizing chamber and is capable of discharging steam from the preliminary pressurizing chamber to the outside of the machine, and an exhaust adjustment cylinder that is capable of adjusting the pressing force of the exhaust adjustment member against the exhaust passage, and the exhaust adjustment member comprises a force adjustment member that is moved forward and backward by the exhaust adjustment cylinder, a spring that abuts the force adjustment member, an extendable rod that is inserted into the spring, and a rod tip portion at the tip of the extendable rod, the rod tip portion having a diameter larger than the diameters of the exhaust passage and the spring, and the exhaust adjustment member is capable of freely adjusting the amount of steam discharged through the exhaust passage.

[0013] The invention related to (6) is a commercial pressure rice cooker described in any of (1) to (5) above, which has a control unit capable of controlling the pressure adjustment mechanism, and the control unit controls the exhaust adjustment member according to the amount of rice cooked, thereby adjusting the amount of steam exhausted. [Effects of the Invention]

[0014] According to the present invention, the pressure adjustment mechanism, which is capable of adjusting the pressure inside the rice cooker by being pressed around the steam vent hole, is equipped with an exhaust adjustment member that is capable of adjusting the amount of steam exhausted inside the exhaust hood that is pressed around the steam vent hole, making it possible to improve rice cooking quality and production efficiency regardless of the amount of rice cooked, and to significantly reduce various losses related to rice cooking compared to conventional methods. [Brief explanation of the drawings]

[0015] [Figure 1]1 is a perspective view of a commercial pressure rice cooker according to a first embodiment of the present invention. FIG. [Figure 2] 1 is a top view of a commercial pressure rice cooker according to a first embodiment of the present invention. FIG. [Figure 3] 1A and 1B are a perspective view and a side view, respectively, of a rice cooker pot and a lid used in a commercial pressure rice cooker. [Figure 4] 1A and 1B are a perspective view and a side view of a sealing device according to a first embodiment of the present invention. [Figure 5] 4A and 4B are diagrams illustrating the pressure adjustment mechanism according to the first embodiment of the present invention, and are a cross-sectional view (a) of the exhaust hood before it is pressed against the lid, and a cross-sectional view (b) of the exhaust hood after it is pressed against the lid. [Figure 6] FIG. 2 is a cross-sectional view illustrating a pressure adjustment mechanism according to the first embodiment of the present invention. [Figure 7] 5A and 5B are cross-sectional views illustrating a pressure adjustment mechanism according to another embodiment of the present invention, in which (a) is a cross-sectional view of a second embodiment and (b) is a cross-sectional view of a third embodiment. [Figure 8] 1A is a top view for explaining a rotating means in the first embodiment of the present invention, and FIG. 1B is a rear view of the rotating means. [Figure 9] 4 is a graph comparing the pressure inside the pot in the first embodiment of the present invention with the pressure inside the pot in a conventional rice cooker. DETAILED DESCRIPTION OF THE INVENTION

[0016] A first embodiment of the commercial pressure rice cooker of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a perspective view of the commercial pressure rice cooker 1, and Fig. 2 is a top view of the commercial pressure rice cooker 1. Fig. 3(a) and Fig. 3(b) are views showing a rice cooker 3 used in the commercial pressure rice cooker 1 and a lid 4 for covering the opening of the rice cooker 3.

[0017] Commercial pressure rice cooker 1 is composed of a main body 2 having a heating means for heating rice cooker 3 and a storage compartment for storing rice cooker 3. Various heating means can be used, but the present invention uses induction heating, and inside main body 2 are provided a heating coil, an inverter that passes a high-frequency current through the heating coil to cause rice cooker 3 to generate heat through electromagnetic induction, and a control unit for controlling the inverter. Figures 1 and 2 show rice cooker 3 with its opening covered by lid 4 stored in the storage compartment of main body 2.

[0018] The main body 2 is provided with a plurality of sealing devices 5 for tightly sealing the rice cooker pot 3 and the lid 4 during rice cooking. It also has a pressure adjustment mechanism 50 that presses the lid 4 around the steam release hole 21 and is capable of adjusting the pressure inside the rice cooker 3. As shown in Figures 5 and 6, the pressure adjustment mechanism 50 is provided with at least an exhaust hood 28 equipped with a preliminary pressurizing chamber 6 that can retain steam exhausted from the steam release hole 21 in the lid 4, a pressing cylinder 51 for raising and lowering the exhaust hood 28 and moving it horizontally, and a rotating arm 8 for rotating the exhaust hood 28 horizontally.

[0019] Figure 4(a) shows a perspective view of the sealing device 5. The sealing device 5 is provided to seal the opening of the rice cooker 3 with the lid 4 during rice cooking, and a cylinder mounting base 9 is fixed to the main body 2 with screws or the like. An air cylinder 11 is attached to the side wall 10 of the cylinder mounting base 9, and a U-shaped block main body 22 is attached to a support base 14 of the air cylinder 11 with a spacer 15 in between. The cylinder mounting base 9 is provided with a rotatable positioning roller 23 that serves as a positioning means when storing the rice cooker 3 in the storage compartment of the main body 2. The air cylinder 11 has a speed controller 47 connected to an air compressor (not shown) via a solenoid valve.

[0020] Upper and lower clamp arms 12 and 13 are provided on the upper and lower front surfaces of block body 22 to clamp flange 25 of rice cooker 3 and flange 24 of lid 4. Rotatable rollers 16 and 17 are attached horizontally and parallel to the tips of upper and lower clamp arms 12 and 13. Block body 22 is configured to be able to move back and forth freely by means of telescopic rod 18 of air cylinder 11, and is further provided with anti-rotation pestle 19 to prevent rotation of block body 22 when it is moved back and forth.

[0021] In the present invention, four sealing devices 5 are disposed at equal intervals around the circumference of the rice cooker 3 as shown in Figures 1 and 2, but the number is not necessarily limited to four, and the number of sealing devices 5 can be increased or decreased depending on the pressure conditions during rice cooking. For example, if high pressure is required inside the rice cooker 3, the number of sealing devices 5 can be increased, and if the pressure inside the rice cooker 3 does not need to be increased as much, the number of sealing devices 5 can be decreased.

[0022] The rice cooker 3 is a round kettle, and the rice cooker 3 and lid 4 have the same diameter. The pressing surface 20 provided in the center of the lid 4 forms a flat surface (plane), and an O-ring 32 provided on the exhaust hood 28 is pressed against it from above at the position indicated by the dotted line (symbol E) in Fig. 3, as shown in Fig. 6 and other figures. In addition, one or more through steam escape holes 21 are provided inside the dotted line indicated by symbol E. It is preferable that the material of the pressing surface 20 be magnetic, so that the lid 4 can be opened and closed by magnetic force.

[0023] 4(b) shows a partial cross-sectional view of the commercial pressure rice cooker 1 during pressure cooking and a side view of the sealing device 5. As shown in the figure, the flange 25 of the rice cooker 3 and the flange 24 of the lid 4 are clamped and sealed by the upper clamp arm 12 and the lower clamp arm 13 of the sealing device 5.

[0024] When clamping flanges 24 and 25, air cylinder 11 advances block body 22 forward, and rolling rollers 16, 17 of upper clamp arm 12 and lower clamp arm 13 press against flanges 24 and 25, respectively, to sandwich them. This pressing brings upper end 27 of rice cooker 3 into pressure contact with packing 26 attached in a ring shape to a position inside flange 24 of lid 4, sealing the rice cooker. Therefore, flanges 24 and 25 do not come into contact.

[0025] As shown in FIG. 6, the exhaust hood 28 includes at least a preliminary pressurizing chamber 6 capable of retaining steam discharged from the steam vent hole 21, an exhaust passage 33 that communicates with the preliminary pressurizing chamber 6 and is capable of discharging steam outside the apparatus, an exhaust adjustment member 52 that is capable of adjusting the amount of steam discharged within the exhaust hood 28, and an exhaust adjustment cylinder 7 that is capable of adjusting the position and pressing force of the exhaust adjustment member 52 relative to the exhaust passage 33.

[0026] That is, the preliminary pressurizing chamber 6 is capable of temporarily retaining the steam emitted from the rice cooker 3, and is formed inside the cylindrical exhaust hood 28. As shown in Figures 5(a) and 5(b), the exhaust hood 28 is raised and lowered and moved horizontally by a pressure cylinder 51. Also, as shown in Figure 6, the exhaust adjustment cylinder 7 has a speed controller 48 connected to an air compressor (not shown) via a solenoid valve, and is attached to the extendable rod 29 of the exhaust adjustment member 52.

[0027] During rice cooking, as shown in the diagrams of each stage in FIGS. 5(a) and 5(b), the exhaust hood 28 is moved horizontally by the pressure cylinder 51 to a position directly above the steam vent hole 21 provided in the center of the lid 4 and pressed against the pressing surface 20 of the lid 4. At this time, the annular O-ring 32 attached to the bottom surface of the exhaust hood 28 is pressed against the flat pressing surface 20. Also, FIG. 6 shows a cross-sectional view of the first embodiment. As shown in the figure, the exhaust adjustment member 52 has a rod tip 54 at the tip of the telescopic rod 29. The exhaust adjustment cylinder 7 moves back and forth to block the outlet of the exhaust passage 33 with a desired pressing force. In the first embodiment, as shown in the figure, the rod tip 54 has a diameter larger than the diameter of the exhaust passage 33.

[0028] During rice cooking, steam flows into pre-pressurization chamber 6 through steam vent hole 21, and the steam can be discharged to the outside of the device through exhaust passage 33 located above pre-pressurization chamber 6. During the boiling maintenance step during rice cooking, the increase in pressure of the steam that has flowed into pre-pressurization chamber 6 pushes up exhaust adjustment member 52, and some of the steam is discharged to the outside of the device via steam exhaust pipe 34, exhaust valve 35, and exhaust pipe 49. Steam that is not discharged is compressed and remains inside pre-pressurization chamber 6. With this configuration, the pressure inside pre-pressurization chamber 6 gradually increases, and accordingly, the pressure inside rice cooker 3 also increases, and is then maintained at a constant pressure by the action of exhaust adjustment member 52. In other words, the pressure inside the cooker is also maintained at a constant pressure.

[0029] As described above, the steam exhaust pipe 34, which communicates with the exhaust passage 33, is connected to the exhaust pipe 49 via the exhaust valve 35, making it possible to exhaust steam to a predetermined location outside the machine, and the diameter of the steam exhaust pipe 34 is larger than that of the exhaust passage 33 in order to smoothly exhaust steam. Also, in case the pressure in the preliminary pressurization chamber 6 becomes abnormally high, a safety valve 36 is provided as shown in FIG. 1.

[0030] The diameter of the exhaust passage 33 can be designed as desired, and the preliminary pressurizing chamber 6 in this embodiment is formed in a conical shape as shown in the drawing. The shape of the preliminary pressurizing chamber 6 is not necessarily limited to a conical shape, and may be a polygonal pillar, a polygonal pyramid, a cylinder, or the like. Furthermore, the diameter of the steam escape hole 21 in this embodiment is about 5 mm, but the diameter of the preliminary pressurizing chamber 6 needs to be large enough to cover all of the multiple steam escape holes 21 provided.

[0031] The rotating arm 8 to which the exhaust hood 28 is attached is configured to be able to rotate horizontally by a rotating means 37 described later, and when cooking rice, the exhaust hood 28 rotates to a position directly above the steam vent hole 21 provided in the center of the lid 4, and when the rice cooker 3 is being inserted or removed, it rotates to a retracted position as shown in Figure 8(a). Also, when cooking rice, the exhaust hood 28 may be moved by the pressure cylinder 51 to a position directly above the steam vent hole 21 provided in the center of the lid 4. In Figure 8(a), the telescopic rod 18 of the air cylinder 11 is in the returned state, and the rolling roller 16 is not in contact with the flange 24 of the lid 4.

[0032] As shown in Figures 8(a), (b), etc., the rotation means 37 is composed of a shaft cover 38 that is in contact with the upper surface 40 of the main body 2, a shaft 39 that is rotatably arranged within the shaft cover 38 via a bearing, and an air cylinder 41 that is connected to the lower end of the shaft 39 inside the main body 2.

[0033] FIG. 8(b) is a diagram illustrating the rotating means 37, showing the rotating means 37 from below the commercial pressure rice cooker 1. The shaft cover 38 and shaft 39 extend into the main body 2, and the shaft cover 38 is fixed to a fixed plate 42 provided inside the main body 2. One end of the air cylinder 41 is rotatably attached to a fixed shaft 43, and the tip of the other end, a rod 44, is connected to a bending arm 46 via a pin 45. The other end of the bending arm 46 is fixed to the lower end of the shaft 39. Because the rotating means 37 is configured in this manner, when the rod 44 of the air cylinder 41 is advanced or retreated, the pin 45 serves as a fulcrum axis, causing the shaft 39 to rotate, and the rotating arm 8 to rotate horizontally. Note that a rotating means such as a motor may be used for the rotating means 37.

[0034] Next, the operation of the commercial pressure rice cooker 1 having the above configuration will be described.

[0035] An appropriate amount of rice and cooking water are placed into the rice cooker 3, and the opening of the rice cooker 3 is covered with the lid 4 to perform the soaking process. After the soaking process, the rice cooker 3 is transported to the storage section of the commercial pressure rice cooker 1. The soaking process can be performed while the rice cooker 3 is stored in the storage section of the commercial pressure rice cooker 1, or an empty rice cooker 3 can be transported to the commercial pressure rice cooker 1 and the rice and cooking water can be placed into the rice cooker 3 after transport. It is also desirable to provide a stirring step for stirring the rice inside the rice cooker 3 after soaking, and seasonings and ingredients may also be added depending on the type of rice being cooked.

[0036] When the rice cooker 3 is transported to the commercial pressure rice cooker 1, multiple sealing devices 5 are activated and the rice cooker 3 is sealed with the lid 4 by the rolling rollers 16 and 17. The rice cooker 3 is sealed by a signal from a control unit (not shown), which causes the telescopic rod 18 of the air cylinder 11 to extend, and the rolling rollers 16 and 17 attached to the tip of the telescopic rod 18 clamp the flange 25 of the rice cooker 3 and the flange 24 of the lid 4 placed on top of the flange 25.

[0037] Next, the rotating arm 8, which is in the retracted position as shown in Figure 8(a), is rotated horizontally by the rotating means 37, and the exhaust hood 28 attached to the tip of the rotating arm 8 moves to directly above the pressing surface 20 of the lid 4 as shown in Figure 5(a). Alternatively, the pressure cylinder 51 moves the exhaust hood 28 to a position directly above the steam vent hole 21 provided in the center of the lid 4. After the movement, the pressure cylinder 51 contracts as shown in Figure 5(b), thereby lowering the rotating arm 8 and pressing the bottom surface of the exhaust hood 28 against the pressing surface 20.

[0038] Then, with the exhaust hood 28 still pressed against the pressing surface 20, heating of the rice cooker 3 begins using a heating means (not shown). The rice cooker 3 is heated according to a preset rice cooking pattern. Figure 9 shows the pressure inside the pot of a conventional rice cooker (shown by the dashed line) and the pressure inside the pot of the commercial pressure rice cooker 1 of this embodiment. As shown in the figure, with the commercial pressure rice cooker 1 of this embodiment, after cooking begins, the first four minutes are the cooking process, from four to nine minutes is the boiling maintenance process, and from nine minutes onwards is the cooking process. Compared to conventional rice cookers, it is more difficult for steam inside the pot to escape, so the pressure inside the pot rises more quickly and the drop in pressure inside the pot is slower.

[0039] That is, in the commercial pressurized rice cooker 1 of this embodiment, the exhaust adjustment cylinder 7 causes the exhaust adjustment member 52 to block the exhaust passage 33 with a desired pressing force, making it possible to discharge steam appropriately according to the pressure inside the cooker, and making it possible to maintain a constant pressure inside the cooker without being affected by the amount of cooked rice, the amount of cooking water, or the heat. Also, the air compressor and solenoid valve (not shown) connected to the exhaust adjustment cylinder 7 of this embodiment are controlled by a control unit (not shown), which controls the pressing force of the exhaust adjustment member 52. In addition, the control unit can also be used to control the exhaust adjustment member 52 so that it does not block the exhaust passage 33.

[0040] The above-mentioned configuration improves rice cooking quality and production efficiency regardless of the amount of rice cooked, making it possible to control the quality according to the intended use of the rice. In addition, it is possible to significantly reduce potential cost losses, such as waste disposal, rice milling waste, and unnecessary gas and electricity losses, which have been problems in the past.

[0041] (Another embodiment) The commercial pressure rice cooker of the present invention has been described above, particularly the first embodiment equipped with an exhaust adjustment member 52 as shown in Figure 6. However, the present invention is not necessarily limited to the above-described embodiment, and the following modifications are possible.

[0042] For example, FIG. 7(a) shows the pressure adjustment mechanism 50 in the second embodiment, and FIG. 7(b) shows the pressure adjustment mechanism 50 in the third embodiment.

[0043] 7(a), the exhaust adjustment member 52 includes a biasing force adjustment member 56 that is advanced and retreated by the exhaust adjustment cylinder 7, a spring 55 that contacts the biasing force adjustment member 56, an extendable rod 29 that is inserted through the spring 55, and a rod tip portion 54 at the tip of the extendable rod 29. With this configuration, the biasing force of the spring 55 can be adjusted by expanding and contracting the biasing force adjustment member 56, and the pressing force of the rod tip portion 54 on the exhaust passage 33 can be adjusted. This makes it possible to use the exhaust adjustment member 52 to arbitrarily adjust the amount of steam exhausted through the exhaust passage 33. Note that the rod tip portion 54 in the second embodiment has a diameter larger than the diameters of the exhaust passage 33 and the spring 55.

[0044] 7(b), an exhaust adjustment member 52 includes an extendable rod 29 that is moved back and forth by an exhaust adjustment cylinder 7, and a rod tip 54 at the tip of the extendable rod 29, with the rod tip 54 having a shape that tapers down to a diameter smaller than the diameter of the exhaust passage 33. That is, the diameter of the extendable rod 29 of the exhaust adjustment member 52 is formed slightly larger than the diameter of the exhaust passage 33, and the tip of the extendable rod 29 is formed with a tapered conical rod tip 54. Therefore, as the pressure inside the pot increases, the exhaust adjustment member 52 is gradually pushed up, and the amount of steam discharged from the exhaust passage 33 increases or decreases depending on the magnitude of the pressure.

[0045] In the second and third embodiments described above, the same functions and effects as in the first embodiment can be obtained.

[0046] In the first embodiment described above, air cylinders using compressed air are used for the exhaust adjustment cylinder 7, the air cylinders 11 and 41, and the pressure-bonding cylinder 51. However, this is not necessarily limited to these, and known electric cylinders can also be used. However, it is preferable to use an air cylinder, which is structurally less complicated. In addition, since the pressure in the air cylinder can be adjusted by a control unit (not shown), this is suitable for arbitrarily adjusting the amount of steam exhausted through the exhaust passage 33.

[0047] Although the present invention has been described above with reference to an embodiment and other embodiments, these descriptions are provided to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from its spirit, and the present invention includes equivalents thereof. Furthermore, the components described in the claims and specification may be combined or omitted to the extent that at least some of the above-mentioned problems can be solved or at least some of the effects can be achieved. [Explanation of symbols]

[0048] 1. Commercial pressure rice cooker 2 Main unit 3. Rice cooker 4 Lid 5 Sealing device 6. Reserve pressure chamber 7 Exhaust adjustment cylinder 8 Rotating Arms 9 Cylinder mounting base 10 side wall 11 Air cylinder 12 Upper clamp arm 13 Lower clamp arm 14 Support stand 15 spacer 16 Rolling roller 17 Roller 18 Telescopic Rod 19 Anti-rotation punch 20 Pressing surface 21 Steam Vent 22 Block body 23 Positioning roller 24 flange 25 flange 26 Gasket 27 Upper end 28 Exhaust hood 29 Telescopic Rod 32 O-ring 33 Exhaust passage 34 Steam exhaust pipe 35 Discharge valve 36 Safety valve 37 Rotating means 38 Shaft cover 39 Shaft 41 Air cylinder 42 Fixing plate 43 Fixed axis 44 Rod 45-pin 46 Bending Arm 47 Speed ​​Controller 48 Speed ​​Controller 49 Discharge pipe 50 Pressure adjustment mechanism 51 Crimping cylinder 52 Exhaust adjustment member 53 Rod O-ring 54 Rod tip 55 Spring 56 biasing force adjusting member

Claims

1. The rice cooker has at least a rice cooker, a lid that covers the opening of the rice cooker and has a steam vent hole that discharges steam from the rice cooker, and a pressure adjustment mechanism that can be pressed around the steam vent hole to adjust the pressure inside the rice cooker, The pressure adjustment mechanism includes: an exhaust hood that is press-fitted around the steam escape hole; and an exhaust adjustment member that is capable of adjusting the amount of steam exhausted above the exhaust passage in the exhaust hood, The exhaust hood is a preliminary pressurizing chamber formed between the exhaust passage and the steam escape hole, having a volume larger than that of the exhaust passage, and capable of retaining steam exhausted from the steam escape hole; This commercial pressure rice cooker is characterized by the following.

2. The exhaust hood is an exhaust adjustment cylinder capable of adjusting the position of the exhaust adjustment member relative to the exhaust passage; The exhaust adjustment member is capable of arbitrarily adjusting the amount of steam exhausted through the exhaust passage. The commercial pressure rice cooker according to claim 1.

3. The exhaust adjustment member includes an extendable rod that is moved forward and backward by the exhaust adjustment cylinder, and a rod tip portion at the tip of the extendable rod, The rod tip has a diameter larger than the diameter of the exhaust passage. The commercial pressure rice cooker according to claim 2.

4. The exhaust adjustment member includes an extendable rod that is moved forward and backward by the exhaust adjustment cylinder, and a rod tip portion at the tip of the extendable rod, The rod tip has a shape that tapers down to a diameter smaller than the diameter of the exhaust passage. The commercial pressure rice cooker according to claim 2.

5. The exhaust hood is an exhaust adjustment cylinder capable of adjusting the pressing force of the exhaust adjustment member against the exhaust passage; the exhaust adjustment member includes a biasing force adjustment member that is moved forward and backward by the exhaust adjustment cylinder, a spring that contacts the biasing force adjustment member, an extendable rod that is inserted into the spring, and a rod tip portion at a tip of the extendable rod, the rod tip portion has a diameter larger than the diameters of the exhaust passage and the spring, The exhaust adjustment member is capable of arbitrarily adjusting the amount of steam exhausted through the exhaust passage. The commercial pressure rice cooker according to claim 1.

6. a control unit capable of controlling the pressure adjustment mechanism, The control unit controls the exhaust adjustment member in accordance with the amount of cooked rice, and is capable of adjusting the amount of steam exhausted. The commercial pressure rice cooker according to any one of claims 1 to 5.

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