JP2017148750A - Rice washing device and rice cooking system having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice washing device and a rice cooking system having the same, being simple in a shape of an agitator, excellent in durability and capable of uniformly washing rice.SOLUTION: The problem is solved by providing a rice washing device 1 and a rice cooking system having the rice washing device having a rice washing tank 2 having an inverse circular truncated cone-shaped rice washing space α, a rotary shaft 3 and a plurality of stages of agitator groups installed on the rotary shaft, in which respective agitator groups of the respective stages are constituted of one or a plurality of agitators 7, and among the plurality of stages of agitator groups, at least two stages or more of agitator groups are positioned in the rice washing space α, and when compared between the mutual agitator groups adjacent in the vertical direction positioned in the inverse circular truncated cone-shaped rice washing space α, the number HαNof the agitators for constituting the agitator group positioned above and the number HαNof agitators for constituting the agitator group positioned below, exist in the relationship of HαN>HαN.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rice washing apparatus and a rice cooking system including the same.

  In rice cookers and rice cooking systems, rice-washing devices that receive rice and water that have been weighed to wash rice are used. Such a rice washing apparatus includes a rice washing tank and a stirring means disposed therein, and the rice washing tank discharges the rice after the completion of the rice washing from the lower rice outlet after the completion of the rice washing. In addition, it usually has an inverted frustoconical rice washing space in which the truncated cone is inverted. However, it has been generally difficult to uniformly agitate and wash the rice contained in the inverted frustoconical rice washing space as a whole rice washing tank.

  In order to eliminate such difficulties, for example, in Patent Document 1, the tip portions of a plurality of stirring bodies attached to a rotating shaft disposed in the rice washing tank are arranged along the inner wall of the rice washing tank in plan view. In addition, a rice washing apparatus is proposed in which the stirring effect of rice grains and water is enhanced by disposing the tip of each stirring body at a distance from the rotation shaft in a spiral manner with respect to the rotation shaft. ing. Further, in Patent Documents 2 and 3, the shape of the stirring body is set along the horizontal portion extending in the radial direction of rotation from the rotation shaft and the vertical or the inner wall of the rice washing tank bent downward from the outer end of the horizontal portion. There has been proposed a rice washing apparatus that improves the uniformity of stirring in the rice washing tank by adopting the shape.

  However, in these conventional rice washing apparatuses, the shape of the stirring body is complicated, and the distance from the root portion fixed to the rotating shaft to the tip portion is long, and there is a bent portion in the middle. When rotating at the time of washing the rice, there is a drawback that the stirrer tends to bend due to the resistance of rice and water, which may cause a problem in terms of durability. Moreover, the rice washing apparatus proposed until now was not enough also in the point of implement | achieving uniform rice washing as the whole rice washing tank.

JP-A-11-169288 JP 2002-273241 A JP 2011-11188 A

  The present invention was made in order to eliminate the disadvantages of the conventional rice washing apparatus described above. The rice washing apparatus has a simple stirrer shape, excellent durability, and enables uniform rice washing, and rice cooker equipped with the rice washing apparatus. It is an object to provide a system.

  As a result of intensive efforts to solve the above-mentioned problems, the present inventor made the stirring body rotating together with the rotating shaft into a stirring body having a simple shape that only projects radially from the rotating shaft, and 1 or A plurality of stirrer groups composed of a plurality of stirrers are arranged at different positions along the longitudinal direction of the rotating shaft, and the number of stirrers in each stage of the stirrer group is below the inverted frustoconical rice washing tank. By using less stirrer as it goes, it is found that the rice contained in the rice washing tank having the inverted frustoconical rice washing space can be washed more uniformly while using a simple stirring body, and the present invention is completed. did.

That is, the present invention includes a rice washing tank provided with an inverted frustoconical rice washing space α, a rotation axis that passes through the center of the horizontal circular section of the rice washing space α and is perpendicular to the horizontal circular section, and a longitudinal direction of the rotation axis. And a plurality of stirrer groups mounted at different positions, each of the stirrer groups at each stage is composed of one or a plurality of stirrers that protrude radially from the rotation shaft. The rotating shaft is at least partially located in the rice washing space α, and among the plurality of stirrer groups, at least two or more stirrer groups are located in the rice washing space α, and are inverted cones. When compared with the vertically adjacent stirring body groups located in the trapezoidal rice washing space α, the number of stirring bodies constituting the stirring body group located above HαN _U and the stirring body located below the number of the stirring body constituting the group HarufaN _D DOO is rice washing device in relation HαN _U> HαN _D, and by providing a cooking system including the same, is to solve the above problems.

  As described above, in the rice washing device of the present invention, the number of stirring bodies constituting the stirring body group existing in at least two or more stages in the inverted frustoconical rice washing space α is below the inverted frustoconical rice washing space α. One major feature is that it decreases as it goes, and by providing such a feature, it is possible to achieve more uniform rice washing. It is a surprising result that the rice washing apparatus having the above characteristics can achieve uniform rice washing as a whole inverted frustoconical rice washing space while using a simple stirring body that protrudes in the radial direction. It is. This is because the inverted frustoconical rice-washing space has a horizontal circular cross-sectional radius that decreases toward the bottom, but the rotational speed of the rotary shaft does not change above and below the rice-washing space, so that stirring with the rotary shaft is performed. If the number of bodies is reduced, the number of times that the stored rice is stirred in direct or indirect contact with the stirring body per rotation of the rotating shaft is reduced. Therefore, if the number of stirrers is reduced, the frequency of contact between the rice and the stirrer will decrease, and it is generally considered that sufficient rice washing will not be performed.

  However, according to what the present inventors have confirmed, it is quite surprising that by reducing the number of stirring bodies constituting the stirring body group toward the lower side of the rice washing space α having the inverted truncated cone shape, More uniform rice washing is realized in the frustoconical rice washing space α. The reason is not clear, but because the rice-washing space has an inverted frustoconical shape, the rice located below the rice-washing space having an inverted frustoconical shape is perpendicular to the rice and the water located immediately above it. In addition to the pressure in the direction, the pressure of rice and water going inward along the slope of the inverted frustoconical slope is applied, and when the stirring body is rotated in that state, the rice and the stirring body Is brought into contact with a larger pressure, so it is presumed that a larger rice washing effect can be obtained as compared with rice located above the rice washing space. Conversely, if the number of stirrers constituting a plurality of stirrer groups located in the inverted frustoconical rice-washing space α is the same regardless of the position of the stirrer group, it is appropriate above the rice wash space α. When the rice is washed, the rice is excessively washed at the bottom, and the rice grains are cracked or chipped.

Incidentally, in the two stirrer group adjacent vertically located bran rice space α of inverted truncated cone shape, the number HarufaN _U and stirrer unit located below the agitator which constitute the agitator unit located above the number HarufaN _D of the stirring body constituting may if the relationship HαN _U> HαN _D, the difference between the HarufaN _U and HarufaN _D may be number as long as it is 1 or more, but the uniformity of the bran rice to increase, the difference between 1, i.e., preferably a HαN _U -HαN _D = 1.

In a preferred embodiment of the rice washing apparatus of the present invention, the rice washing tank has a cylindrical rice washing space β continuous with the rice washing space α above the rice washing space α having an inverted truncated cone shape, At least a part of the rotating shaft is located in the rice washing space β, and among the plurality of stirrer groups, at least one stirrer group is located in the rice washing space β, and the rice washing space β The number HβN _{B of the} stirring bodies constituting the stirring body group located at the lowest position in the inside and the number HαN _{T of the} stirring bodies constituting the stirring body group located at the uppermost position in the rice washing space α are represented by HβN a relationship of _{B> HαN T.}

Thus, in the rice washing apparatus of the present invention, the rice washing tank may have a cylindrical rice washing space β continuously above the inverted frustoconical rice washing space α. The number HβN _{B of the} stirring bodies constituting the stirring body group located at the lowest position in β and the number HαN _{T of the} stirring bodies constituting the stirring body group located at the uppermost position in the washed rice space α are expressed as HβN _B > HαN _{By using} the relationship of _T , uniform rice washing can be realized as a whole rice washing tank including both the cylindrical rice washing space β and the inverted frustoconical rice washing space α. Also in this case, the difference between the HbetaN _B and HarufaN _T may be number as long as it is 1 or more, but difference between them in order to enhance the uniformity of the washed rice 1, i.e., HβN _B -HαN _It is preferred that _T = 1.

  In the rice washing apparatus of the present invention, the stirrer constituting each stirrer group may basically be a stirrer protruding radially from the rotation axis in the radial direction, and a plurality of stirrers exist in one stirrer group. In that case, from the viewpoint of realizing more uniform rice washing, in any one or two or more stirring body groups, a plurality of stirring bodies protrude radially from the rotation axis at equal angular intervals in the radial direction. More preferably, in all of the stirrer groups composed of a plurality of stirrers, it is more preferable that the plurality of stirrers protrude radially from the rotation axis at equal angular intervals in the radial direction.

  In a preferred embodiment of the rice washing apparatus according to the present invention, the one or more stirring bodies constituting the stirring body group are arranged on the front side in the rotation direction of the rotation shaft at the time of rice washing, and the upper end portion is in the rotation direction rather than the lower end portion. It has a planar surface that is recessed backwards. When the stirrer constituting the stirrer group has the above planar surface, the rice grains that are in direct or indirect contact with the stirrer are rotated once by the rotation of the stirrer together with the rotating shaft. After being lifted upward along the surface of the shape, it is dropped downward after passing through the stirring body, so that more effective rice grain stirring effect can be obtained, and washing rice can be finished in a shorter time. can get. The planar surface described above may have any one or two or more stirring bodies constituting the stirring body group, but the entire stirring body constituting the entire stirring body group may have the planar surface described above. It is more preferable to have it.

  The rice washing apparatus of the present invention may be used alone as a rice washing apparatus, but may be used in combination with a rice cooker equipped with a heating means, and more preferably, a plurality of the rice washing apparatus conveyed along a conveyance line. It is good to use as a rice-washing apparatus in the rice-cooking system which cooks rice separately for every rice-cooker using an individual rice-cooker. In addition, although the rice washing apparatus of this invention is an apparatus mainly used for washing | cleaning of the rice before rice cooking, of course, not only rice but it may be used for washing | cleaning grains other than rice. It is.

  According to the rice washing apparatus of the present invention, the rice washing apparatus provided with a rice washing tank having an inverted frustoconical rice washing space that is convenient for discharging rice can provide an advantage that more uniform rice washing can be realized. Moreover, since the stirring body used for the rice washing apparatus of this invention is a stirring body of the simple shape only protruded in the radial direction from the rotating shaft, there exists a possibility of being damaged by the contact with the rice grain at the time of rice washing, or water There are few advantages, and the advantage that it is excellent in durability is acquired. Furthermore, according to the rice cooking system of this invention provided with the rice washing apparatus of this invention, since the rice washed more uniformly can be supplied to a rice cooker and can be cooked, there is no unevenness and rice with good quality is cooked. The advantage of being able to do is obtained.

It is a front fragmentary sectional view which shows an example of the rice washing apparatus of this invention. It is a front fragmentary sectional view which takes out and shows only the part of the rice washing tank in the rice washing apparatus of FIG. FIG. 3 is a horizontal sectional view taken along line A-A ′ in FIG. 2. FIG. 3 is a horizontal sectional view taken along line B-B ′ in FIG. 2. FIG. 3 is a horizontal sectional view taken along line C-C ′ in FIG. 2. FIG. 3 is a horizontal sectional view taken along line D-D ′ in FIG. 2. FIG. 3 is a horizontal sectional view taken along line E-E ′ in FIG. 2. It is a front view which shows another example of a stirring body. It is a side view which shows another example of a stirring body. It is a top view which shows another example of a stirring body. It is a figure which shows typically a motion of rice and water when rotating the stirring body of the shape shown in FIGS. It is a side view which shows another example of a stirring body.

  Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the illustrated one.

  FIG. 1 is a front partial sectional view showing an example of a rice washing apparatus according to the present invention. In FIG. 1, 1 is a rice washing apparatus, 2 is a rice washing tank constituting the rice washing apparatus 1, and the rice washing tank 2 has an inverted frustoconical rice washing space α at the lower part with a horizontal plane indicated by a broken line a as a boundary. In the upper part of the rice washing space α, a cylindrical rice washing space β is provided continuously with the rice washing space α. Reference numeral 3 denotes a rotation shaft, and the rotation shaft 3 passes through the center of the horizontal circular section of the rice washing tank 2 and is perpendicular to the horizontal circular section so that at least a part thereof is located in the rice washing space α and the rice washing space β. Is arranged. Reference numeral 4 denotes a bearing for rotatably supporting the rotary shaft 3, 5 denotes a gear box, and 6 denotes an electric motor. The upper end of the rotating shaft 3 is connected to the gear box 5 via the bearing 4. When the electric motor 6 is driven, the rotation of the rotor is transmitted to the rotating shaft 3 via the gear box 5. Rotate around a vertical axis.

  7 is an agitator attached to the rotary shaft 3, 8 is a rice outlet, 9 is an opening / closing valve for opening / closing the rice outlet 8, 10 is a water outlet, 11 is an opening / closing valve for opening / closing the water outlet 10, 12 A filter 13 provided at the boundary between the rice washing tank 2 and the water discharge port 10 is an overflow drain port. 14 is a rice supply port, 15 is a rice storage tank, 16 is a water supply port, and 17 is a water storage tank. In this example, the stirrer 7 is a cylindrical bar-shaped stirrer that is uniform in the length direction. However, as described later, the shape of the stirrer 7 is not limited to the cylindrical bar-shaped.

  FIG. 2 is a front partial cross-sectional view showing only the portion of the rice washing tank 2 in the rice washing apparatus 1. As shown in the figure, the stirring body 7 is attached to different positions P1, P2, P3, P4, P5 along the longitudinal direction of the rotating shaft 3, and one or more stirring bodies 7 attached to the same position. Thus, each group constitutes a group of stirring bodies. For example, a plurality of stirring bodies 7 are attached to the position P1, but the stirring body group H1 is configured by the plurality of stirring bodies 7 attached to these positions P1. Similarly, the stirring body groups H2, H3, and H4 are configured by the plurality of stirring bodies 7 that are respectively attached to the positions P2, P3, and P4. In the case of this example, since only one stirring body 7 is attached to the position P5, the stirring body group H5 is composed of one stirring body 7 attached to the position P5.

The vertical intervals h _{1 to} h ₄ between the positions P 1, P 2, P 3, P 4, and P 5 may be different from each other, but the positions P 2, P 3, and P 4 in the inverted frustoconical rice washing space α are different. , vertical spacing _h 2 to h between P5 ₄ is the same, _{respectively,} h _{2 =} is preferably from _{h 3 = h 4, h 1} ~h 4 is all the _{same, h 1 = h 2 = h} 3 It is more preferable that = ₄ . In particular, with respect to the distance h ₁ between positions P1 and P2, the horizontal plane a is the boundary between the rice washing space α and cylindrical bran rice space β of inverted truncated cone shape, the distance h ₁ is equal to the vertical In other words, the vertical distance from the horizontal plane a at the position P1 is preferably set equal to the vertical distance from the horizontal plane a at the position P2.

  As described above, the rotating shaft 3 is provided with the stirrer groups H1 to H5 each composed of one or a plurality of stirrers 7 at different positions P1, P2, P3, P4, and P5 along the longitudinal direction. Among them, the stirring body group H1 is located in the rice washing space β, and the remaining stirring body groups H2 to H5 are located in the rice washing space α. In the illustrated example, the four-stage stirrer groups H2 to H5 are located in the inverted frustoconical rice washing space α, but the number of stirrer groups located in the rice washing space α is four stages. It is not limited, and it is sufficient that at least two or more stirrer groups are located in the rice washing space α. From the viewpoint of realizing more uniform rice washing, the three or more stirrer groups are composed of the rice washing space α. It is preferably located within.

  In the illustrated example, the stirring body group located in the rice washing space β is only one stage of the stirring body group H1, but the stirring body group located in the rice washing space β may be two or more stages. . Furthermore, in the illustrated example, the rice washing tank 2 has the rice washing space β above the rice washing space α, but the rice washing tank 2 only needs to have an inverted frustoconical rice washing space α as the rice washing space. The cylindrical rice washing space β may not exist. Incidentally, when the rice-washing space β does not exist, as a matter of course, the number of stages of the stirrer group existing in the rice-washing space β is zero.

3 to 7 are horizontal sectional views taken along lines AA ′, BB ′, CC ′, DD ′, and EE ′ in FIG. 2, respectively. As shown in FIG. 3, the stirrer group H1 composed of a plurality of stirrers 7 attached to the position P1 is composed of five stirrers 7 projecting radially from the rotary shaft 3 in the radial direction, The circumferential angular intervals θ _{1 to} θ ₅ between the stirring bodies 7 are all equal to 72 degrees.

Similarly, as shown in FIG. 4, the stirrer group H2 composed of a plurality of stirrers 7 attached to the position P2 is composed of four stirrers 7 projecting radially from the rotary shaft 3 in the radial direction. The angular intervals θ _{1 to} θ _{4 in} the circumferential direction between the stirring bodies 7 are all equal and 90 degrees. Further, as shown in FIG. 5, the stirrer group H3 including the plurality of stirrers 7 attached to the position P3 includes three stirrers 7 projecting radially from the rotary shaft 3 in the radial direction. The angular intervals θ _{1 to} θ _{3 in} the circumferential direction between the stirring bodies 7 are all equal and 120 degrees. Furthermore, as shown in FIG. 6, the stirrer group H4 composed of a plurality of stirrers 7 attached to the position P4 is composed of two stirrers 7 projecting radially from the rotary shaft 3 in the radial direction. In addition, the circumferential angular intervals θ ₁ and θ ₂ between the stirring bodies 7 are equal and both are 180 degrees. On the other hand, as shown in FIG. 7, the stirrer group H5 including the stirrer 7 attached to the position P5 includes a single stirrer 7 that protrudes in the radial direction from the rotating shaft 3.

As described above, the stirrer groups H1, H2, H3, H4, and H5 are each composed of five, four, three, two, and one stirrer 7, and each stirrer group. When the stirrer groups H2 to H5 located in the inverted frustoconical rice washing space α are compared with the stirrer groups adjacent in the vertical direction, the number HarufaN _U of the stirring member 7 constituting the body group, the number HarufaN _D of the stirring member 7 constituting the agitator unit located downward, have a relationship of HαN _U> HαN _D, furthermore, HαN _U - HαN _D = 1.

Specifically, for example, in the stirring body groups H2 and H3 adjacent in the vertical direction, the number of stirring bodies 7 constituting the stirring body group H2 located above is HαN _U = 4, and the stirring bodies located below since the number of the stirring member 7 constituting the group H3 is HαN _D = 3, it is in the relationship of HαN _U> HαN _D, furthermore, a relationship of _{HαN U -HαN D = 4-3 = 1} .

Similarly, in the stirring body groups H3 and H4 adjacent in the vertical direction, the number of stirring bodies 7 constituting the stirring body group H3 positioned above is HαN _U = 3, and the stirring body group H4 positioned below is configured. since the number of the stirring member 7 that is HαN _D = 2, is in the relationship of HαN _U> HαN _D, furthermore, a relationship of _{HαN U -HαN D = 3-2 = 1} . Further, in the stirring body groups H4 and H5 adjacent in the vertical direction, the number of stirring bodies 7 constituting the stirring body group H4 located above is HαN _U = 2 and constitutes the stirring body group H5 located below. since the number of the stirring member 7 is HαN _D = 1, it is in the relationship of HαN _U> HαN _D, furthermore, a relationship of _{HαN U -HαN D = 2-1 = 1} .

Thus, in the rice washing apparatus 1 of the present invention, among the plurality of stirring body groups located in the inverted frustoconical rice washing space α, the stirring body groups adjacent in the vertical direction are compared to each other. the number HarufaN _D of the stirring member 7 constituting the agitator unit located several HarufaN _U and the lower stirring member 7 constituting the agitator set to have a relationship of HαN _U> HαN _D. In the present embodiment, the HarufaN _U and HarufaN _D, together with the relation of HαN _U> HαN _D, there is a relationship of HαN _U -HαN _D = 1, the difference between HarufaN _U and HarufaN _D always 1 It is not necessarily limited to 2 or 3 or more. Also, if the stirrer group adjacent vertically located bran rice space α is present a plurality of sets, the difference between HarufaN _U and HarufaN _D is not necessarily the same in all the sets, be different good. However, more in view of realizing a uniform rice washing is preferably the difference between HarufaN _U and HarufaN _D 1, stirrer group adjacent vertically located bran rice space α is present a plurality of sets in this case, the entire set, the difference between HarufaN _U and HarufaN _D is preferably 1.

Also, if even there are agitator groups cylindrical rice washing space beta is a number HbetaN _B of the stirring member 7 constituting the agitator unit located lowermost in the rice washing space beta, inverted truncated cone shape the number HarufaN _T of stirrer 7 constituting the agitator group positioned uppermost in rice washing space α is preferably in the relationship of HβN _B> HαN _T. In this example, since the stirring body group located in the rice washing space β is only the stirring body group H1, the stirring body group H1 is the stirring body group located at the lowest position in the rice washing space β. Since the number of the stirring bodies 7 constituting the group H1 is five, HβN _B = 5. On the other hand, there are four stirring body groups H2 to H5 in the rice washing space α, and the number of stirring bodies 7 constituting the stirring body group H2 located at the uppermost position among them is 4, so that HαN _T = 4, HβN _B > HαN _T , and the difference between HβN _B and HαN _T is 1.

Incidentally, the difference between HbetaN _B and HarufaN _T is not necessarily limited to one, but may be two or more, but more from the viewpoint of realizing uniform bran rice, difference HbetaN _B and HarufaN _T Is preferably 1. Also, when the rice washing tank 2 has no cylindrical bran rice space β is the first place, since the agitator unit located lowermost in the rice washing space β absent, not present HβN _B.

  Hereinafter, an example of operation | movement of the rice washing apparatus 1 of this invention is demonstrated using FIG. First, with the on-off valve 9 for opening and closing the rice discharge port 8 closed and the on-off valve 11 for opening and closing the water discharge port 10 open, a predetermined amount of rice measured from the rice storage tank 15 passes through the rice supply port 14. In addition to being supplied into the rice washing tank 2, water for washing the rice is supplied from the water storage tank 17 through the water supply port 16 into the rice washing tank 2. Then, the electric motor 6 is driven, the rotating shaft 3 rotates with the stirring body 7 attached to each position P1-P5, and preliminary washing is performed. Since the on-off valve 11 is open during the preliminary washing, the preliminary washing is performed while discharging the washing water from the water discharge port 10. However, since the filter 12 is provided at the boundary between the rice washing tank 2 and the water discharge port 10, the rice is not discharged from the water discharge port 10 to the outside.

  When the predetermined pre-washing is completed, all of the washing water is once discharged from the water discharge port 10, the on-off valve 11 is closed, and fresh rice washing water is supplied into the rice washing tank 2 from the water supply port 16. The supply of the rice washing water is stopped when drainage starts from the overflow drain port 13. In this state, the rotating shaft 3 is rotated together with the stirring member 7 to perform rice washing. If necessary, the rotator 3 is temporarily stopped, the on-off valve 11 is opened, all the washing water is discharged to the outside from the water discharge port 10, the on-off valve 11 is closed again, and a new water supply port 16 is opened. The operation of supplying clean rice washing water into the rice washing tank 2 is repeated once or a plurality of times. In addition, at the time of preliminary washing and subsequent rice washing, the rotary shaft 3 may continue to rotate in the same direction, but the rotation direction may be reversed every predetermined rotation angle.

  When the washing is completed by performing such an operation, once the water used for washing the rice has been completely discharged from the water discharge port 10, a predetermined amount of water is newly supplied from the water supply port 16 into the rice washing tank 2. A rice cooker or a soaking container (not shown) located below the rice outlet 8 together with a predetermined amount of water newly supplied with the rice that has been washed in the rice washing tank 2 with the opening / closing valve 9 of the rice outlet 8 opened. Drain into a container. The rice discharged in a rice cooker or a container such as a dipping container is immersed in water for a predetermined time in a rice cooker or a dipping container, and then an appropriate seasoning liquid or ingredients are added as necessary. Will proceed to.

  As described above, 7 kg of rice was washed using the rice washing apparatus 1 shown in FIG. 1, and after the rice was discharged from the rice discharge port 8 into the rice cooker, the rice washes were visually confirmed. There was no shell cracking and no unwashed residue was observed, and the washed rice state was extremely uniform. The reason why such uniform rice washing was realized using the rice washing apparatus 1 shown in FIG. 1 is not certain, but in the inverted frustoconical rice washing space α, the weight of rice and water present immediately above it is increased. In addition, rice and water pressure is applied to the center side of the rotary shaft 3 along the slope of the inverted frustoconical slope, and below the inverted frustoconical rice washing space α. As the contact pressure between the rice and the stirring body 7 increases, the number of the stirring bodies 7 decreases toward the lower side of the inverted truncated cone shape to reduce the contact frequency between the rice and the stirring body 7, thereby reducing the inverted cone. It is presumed that uniform and clean rice was achieved in a well-balanced manner above and below the trapezoidal rice wash space α.

  8 to 10 are a front view, a side view, and a plan view showing another example of the stirring member 7, respectively. As shown in FIGS. 8 to 10, the stirrer 7 of this example is a uniform plate-shaped stirrer whose vertical cross section has a parallelogram shape, and is attached to be inclined with respect to the rotating shaft 3. As a result, the stirrer 7 has a planar surface S whose upper end portion 7t is retracted further backward in the rotational direction than the lower end portion 7b, in the rotational direction of the rotary shaft 3 at the time of rice washing indicated by the arrow R in the figure. have.

  FIG. 11 is a diagram schematically showing the movement of rice and water when the stirring body 7 having the shape shown in FIGS. 8 to 10 is rotated in the rice washing tank 2. As shown in FIG. 11, the stirring body 7 of the present example has a planar shape in which the upper end portion 7t is moved backward in the rotation direction R from the lower end portion 7b in front of the rotation axis R of the rotating shaft 3 at the time of washing the rice. Since it has the surface S, if this is rotated in the rice washing tank 2, the rice and water that are in direct or indirect contact with the stirring body 7 are the surface of the stirring body 7 as shown by the arrow v in the figure. After being lifted upward along S, when the upper end portion 7t of the stirrer 7 is exceeded, it falls again downward, so that the contact frequency between the rice grains and water or the rice grains increases, and higher rice washing efficiency is achieved. Can be realized.

  In addition, the cross-sectional shape of the stirring body 7 is not limited to a parallelogram, and may be a quadrangle as shown in FIG. 12, for example. In addition, the inclination angle ω formed by the stirrer 7 and the horizontal plane is basically not limited. However, when the inclination angle ω exceeds 45 degrees, the resistance received from the rice and water during rotation in the rice washing tank 2 increases. On the contrary, if it is less than 30 degrees, sufficient stirring effect may not be obtained, so 30 degrees or more and 45 degrees or less are preferable.

  As described above, according to the rice washing apparatus of the present invention, uniform rice washing can be realized while providing an inverted frustoconical rice washing space. The rice washing apparatus of the present invention is not only useful as a rice washing apparatus in an individual rice cooking apparatus, but also useful as a rice washing apparatus in a rice cooking system having a large number of rice cooking pots. The industrial applicability of this rice cooking system is enormous.

DESCRIPTION OF SYMBOLS 1 Rice-washing apparatus 2 Rice-washing tank 3 Rotating shaft 4 Bearing 5 Gear box 6 Electric motor 7 Stirrer 8 Rice discharge port 9, 11 On-off valve 10 Water discharge port 12 Filter 13 Overflow drain port 14 Rice supply port 15 Rice storage tank 16 Water supply Mouth 17 Water storage tank α Reverse-conical rice-washing space β Cylindrical rice-washing space a Boundary surface between rice-washing space α and rice-washing space β H1 to H5 Stirring body group

Claims (5)

A rice-washing tank having an inverted frustoconical rice-washing space α, a rotation axis passing through the center of the horizontal circular section of the rice-washing space α and perpendicular to the horizontal circular section, and attached to different positions along the longitudinal direction of the rotation axis A plurality of stirrer groups, and each of the stirrer groups in each stage is composed of one or a plurality of stirrers radially projecting radially from the rotating shaft, and the rotating shaft is at least A part of the rice washing space α is located in the rice washing space α, and at least two or more stages of the stirring body group are located in the rice washing space α. When compared between the stirring body groups adjacent in the vertical direction located in α, the number of stirring bodies constituting the stirring body group located above HαN _U and the stirring body constituting the stirring body group located below the number HαN _D of, HαN _U> Hα Rice washing device in a relationship of N _D. The rice-washing tank has a cylindrical rice-washing space β continuous with the rice-washing space α above the rice-washing space α having an inverted frustoconical shape, and at least a part of the rotation shaft is located in the rice-washing space β. In addition, among the plurality of stirrer groups, at least one stirrer group is located in the rice wash space β, and the stirrer constituting the stirrer group located at the lowest position in the rice wash space β the number HbetaN _B of the body, the rice washing the number HarufaN _T stirring member constituting the agitator group positioned uppermost in the space α is, HβN _B> the relation of HarufaN _T claims 1 bran rice apparatus according .   The rice washing apparatus according to claim 1 or 2, wherein, in any one or two or more of the stirring body groups, the plurality of stirring bodies protrude radially from the rotation shaft at equal angular intervals in the radial direction.   In any one or two or more of the agitator groups, the one or more agitators constituting the agitator group are arranged on the front side in the rotational direction of the rotating shaft at the time of washing the rice, and the upper end portion is more than the lower end portion. The rice-washing apparatus in any one of Claims 1-3 which has the planar surface set back in the rotation direction.   It is a rice cooking system which cooks rice individually for every rice cooking pot using a plurality of rice cooking pots conveyed along a conveyance line, and is a rice washing device which washes the rice supplied to the rice cooking pot. A rice cooking system comprising the rice washing apparatus according to any one of 4.

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