Rice milling device and household rice milling machine

Abstract

The invention relates to a rice milling device and a household rice milling machine, and the rice milling device comprises a conveying unit, a rice milling unit and a control unit, the spraying unit is used for spraying water vapor to the conveying channel, and the temperature of the water vapor is higher than the surface temperature of the rice entering the conveying channel; the rice milling unit is provided with a rice milling channel used for milling the unhulled rice, and the rice milling channel communicates with the conveying channel; and the cooling unit is used for cooling the rice located in the rice milling channel. According to the rice milling device, the spraying unit can spray water vapor with higher temperature to rice, so that the surfaces of rice grains quickly absorb moisture, the volume of the rice grains is expanded by 3%-5%, and in the rice milling process, the cooling unit continuously takes away heat of the rice grains and rice hulls, so that the rice grains and the rice hulls which are originally expanded due to heating of hot fog are quickly cooled, and the rice milling efficiency is improved. The binding force between the rice grains and the rice hulls is softened through the heat effect, the structural difference between the rice grains and the rice hulls is strengthened through the cold effect, the shelling process is smoother and more controllable, and the better shelling effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rice mills, in particular to a rice milling device and a household rice mill. BACKGROUND

[0002] With the pursuit of health, people are increasingly fond of ecological and original lifestyle, and rice, as one of the main food in people's daily life, a household rice mill can easily process rice into rice in the home, meeting people's demand for fresh and healthy rice.

[0003] Among them, water immersion particles refer to 100 rice grains soaked in 20°C test water for 20 minutes, and then the rice grains with cracks are detected. Due to the size limitation of the household rice mill, the household rice mill cannot adopt the step-by-step layering method to achieve complete hulling like large-scale grain mills, but only through increasing the grinding pressure or prolonging the grinding time to achieve complete hulling, but this method will increase the water immersion particle rate of the household rice mill, and then more broken rice grains will appear. Broken rice grains will cause nutrient loss and cannot meet people's demand for fresh and healthy rice. SUMMARY

[0004] Therefore, it is necessary to provide a rice milling device and a household rice mill to solve the problem that complete hulling increases the water immersion particle rate of the household rice mill.

[0005] A rice milling device comprises:

[0006] A conveying unit having a conveying channel for conveying rice;

[0007] A spraying unit for spraying water vapor into the conveying channel, the temperature of the water vapor being greater than the surface temperature of the rice entering the conveying channel;

[0008] A rice milling unit having a rice milling channel for milling the rice, the rice milling channel being in communication with the conveying channel;

[0009] A cooling unit for cooling the rice in the rice milling channel.

[0010] In one embodiment, the rice milling unit comprises a rice milling bin and a rice milling roller, the rice milling bin forms the rice milling channel, and the rice milling roller is rotatably arranged in the rice milling channel about its own axis, and the cooling unit is configured to exchange heat with the rice milling roller to reduce the surface temperature of the rice milling roller.

[0011] In one of the embodiments, the cooling unit is configured to exchange heat with both the rice milling roller and the spraying unit, the cooling unit is used to output cold energy to the rice milling roller, and the cooling unit is used to output heat to the spraying unit.

[0012] In one of the embodiments, the cooling unit comprises a compressor, a condenser, a throttling device and an evaporator, the compressor, the condenser, the throttling device and the evaporator are connected by pipes and form a refrigeration circuit, a refrigerant circulates in the refrigeration circuit, the condenser is configured to exchange heat with the spraying unit, and the evaporator is configured to exchange heat with the rice milling roller.

[0013] In one of the embodiments, the evaporator is an evaporating pipe arranged inside the rice milling roller.

[0014] In one of the embodiments, the evaporating pipe extends in the rice milling roller in a zigzag manner.

[0015] In one of the embodiments, the spraying unit is provided with atomized water and an atomizing piece, the atomizing piece is used to atomize the atomized water into water vapor, and the spraying unit receives heat from the cooling unit to heat the atomized water.

[0016] In one of the embodiments, the conveying unit further comprises a conveying inlet, the conveying inlet is connected with the conveying channel, and the conveying inlet is controllably opened or closed.

[0017] In one of the embodiments, the conveying unit further comprises a humidity sensor, the humidity sensor is arranged in the conveying channel.

[0018] In one of the embodiments, the conveying unit comprises a conveying shell and a heat preservation member, the conveying channel is formed in the conveying shell, and the heat preservation member covers the conveying shell.

[0019] A household rice mill comprises the rice milling device according to any one of the above.

[0020] The rice milling device is used for spraying water vapor with a higher temperature onto the pre-processed rice grains in the rice milling channel, so that the rice grains complete a mild and controllable heat and humidity treatment before entering the rice milling chamber. The humidity of the water vapor is accurately controlled at about 50%, which is enough to make the surface of the rice grains quickly absorb moisture and expand by 3%-5%, significantly enhancing the elasticity and toughness of the rice grains, and avoiding the subsequent risks caused by excessive humidity. At the same time, since the thermal conductivity of the rice hull is much lower than that of the rice grains, the heating speed of the rice hull lags behind, and the water absorption capacity of the rice hull is also weaker, so the volume change of the rice hull is much smaller than that of the rice grains under the action of the hot mist, forming a state of the rice grains expanding more than the rice hull, thereby naturally generating a small gap and stress area between the rice grains and the rice hull.

[0021] After the rice, pretreated with steam, enters the milling channel, the cooling unit continuously removes heat from the rice grains and husks during the milling process, rapidly cooling the grains and husks that had expanded due to the hot steam. Because rice grains have higher heat capacity and thermal conductivity after absorbing water and expanding, their cooling and shrinkage rate is much faster than that of the husks. This results in a greater shrinkage of the rice grains compared to the smaller shrinkage of the husks, and the resulting difference in thermal expansion and contraction further widens the existing gaps. This dynamically changing gap makes the husks more prone to localized breakage and peeling under the milling force, while the rice grains themselves, due to their increased elasticity and uniform internal stress distribution, are less prone to cracking.

[0022] This "synergistic effect of thermal expansion and contraction" mechanism uses the thermal effect to soften the bonding force between the rice grain and the rice husk, and the cooling effect to strengthen the structural difference between the two, making the dehulling process smoother and more controllable, achieving a better dehulling effect. At the same time, while ensuring milling efficiency, it maximizes the protection of the integrity of the rice grain and reduces the water-soaked grain rate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the rice milling device in some embodiments of this application.

[0024] Figure 2 for Figure 1 The working principle diagram of the cooling unit in the embodiment.

[0025] Figure 3 This is a schematic diagram of the structure of rice entering the conveying channel in some embodiments of this application.

[0026] Figure 4 for Figure 3 A schematic diagram of the structure of medium-grain rice after it has been heated by a spray unit.

[0027] Figure 5 for Figure 3 A schematic diagram of the cooling unit for medium-grain rice.

[0028] Explanation of reference numerals in the attached figures:

[0029] Conveying unit 10; Conveying channel 11;

[0030] Spray unit 20; Humidity sensor 21;

[0031] Rice milling unit 30; rice milling channel 31; rice milling bin 32; rice milling roller 33;

[0032] Cooling unit 40; condenser 41; evaporator 42; evaporator tube 43;

[0033] Rice grains 50; rice husks 51; rice husks 52. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] See Figure 1 , Figure 1 A schematic diagram of the structure of a rice milling device according to an embodiment of this application is shown. The rice milling device provided in an embodiment of this application includes a conveying unit 10, a spraying unit 20, a rice milling unit 30, and a cooling unit 40. The conveying unit 10 has a conveying channel 11 inside, and the conveying unit 10 also includes a conveying inlet and a conveying outlet connected to the conveying unit 10. The conveying inlet and the conveying outlet are located at both ends of the conveying channel 11 in its longitudinal direction. The user can put rice 50 into the conveying channel 11 through the conveying inlet so that the rice 50 can be conveyed to the conveying outlet through the conveying channel 11.

[0041] Furthermore, the rice milling unit 30 has a rice milling channel 31 for milling paddy rice 50, and one end of the rice milling channel 31 is connected to the conveying outlet. After the paddy rice 50 in the conveying channel 11 is discharged from the conveying outlet, it enters the rice milling channel 31 and is repeatedly milled in the rice milling channel 31, so that the paddy rice 50 can be dehulled to form rice grains 51. Finally, the rice grains 51 are discharged through the outlet of the rice milling channel 31 for user use. A screen is provided at the outlet of the rice milling channel 31. After the rice grains 51 have been dehulled, they are separated by the screen and discharged through the outlet of the rice milling channel 31, while the paddy husks 52 are collected in the waste bin of the household rice milling machine.

[0042] During the milling process, rice grains 51 are prone to cracking due to concentrated mechanical stress, leading to a significant decrease in the water-soaked grain rate and resulting in a large number of broken rice grains 51. Therefore, the rice milling device also includes a spray unit 20 and a cooling unit 40. The spray unit 20 sprays water vapor into the conveying channel 11. The temperature of the water vapor is higher than the surface temperature of the paddy rice 50 entering the conveying channel 11, so that after the paddy rice 50 comes into contact with the water vapor, the rice grains 51 inside the paddy rice 50 can be heated and absorb the water vapor to expand. Figure 3 and Figure 4 As shown. The cooling unit 40 is used to cool the paddy rice 50 located in the rice milling channel 31 so that the rice grains 51 in the paddy rice 50 can shrink.

[0043] In practical use, the thermal conductivity of rice husk 52 is mostly between 0.06 W / (m·K) and 0.12 W / (m·K), while the thermal conductivity of the dry rice grains 51 inside the rice husk 52 is between 0.15 W / (m·K) and 0.25 W / (m·K). Therefore, when the rice grains 50 come into contact with water vapor, the rice grains 51, which have better thermal conductivity, will expand first, while the rice husk 52, which has poor thermal conductivity, will expand slowly. After absorbing water and expanding, the volume of the rice grains 51 will increase by about 3%–5%, thus causing the rice grains 51 to open up some gaps in the rice husk 52.

[0044] Based on this, the heated and expanded paddy rice 50 enters the rice milling channel 31, where the cooling unit 40 can cool the heated and expanded paddy rice 50. Also, because the thermal conductivity of the rice grain 51 is better than that of the rice husk 52, the rice grain 51 can cool down more quickly, allowing its volume to shrink, such as... Figure 5 As shown, after thermal expansion and contraction, the gap between the rice grains 51 and the rice husks 52 can become larger. At this time, during the milling process of the rice 50 in the rice milling channel 31, the rice husks 52 can be more easily squeezed to remove the husks, reducing the stress on the rice grains 51. This achieves thorough dehulling while effectively reducing the water-soaked grain rate of the rice 50, reducing the number of broken rice grains 51, reducing the loss of nutrients from the rice grains 51, and improving the user experience.

[0045] In the aforementioned rice milling device, after the pre-treated paddy rice 50 enters the milling channel 31, the spray unit 20 sprays higher-temperature water vapor onto the paddy rice 50, allowing the rice grains 51 to undergo a gentle and controllable heat and moisture treatment before entering the milling chamber. The humidity of this water vapor is precisely controlled at around 50%, which is sufficient for the surface of the rice grains 51 to quickly absorb moisture and expand in volume by 3%-5%, significantly enhancing their elasticity and toughness, while avoiding the subsequent risks caused by excessive humidity. At the same time, since the thermal conductivity of the rice husk 52 is much lower than that of the rice grains 51, its heating rate is slower and its water absorption capacity is also weaker. Therefore, under the action of hot mist, the volume change of the rice husk 52 is much smaller than that of the rice grains 51, resulting in a state where the rice grains 51 expand faster than the rice husk 52, thus naturally creating tiny gaps and stress zones between the rice grains 51 and the rice husk 52.

[0046] After the paddy rice 50, pretreated with steam, enters the milling channel 31, the cooling unit 40 continuously removes heat from the rice grains 51 and husks 52 during the milling process, rapidly cooling the rice grains 51 and husks 52 that had expanded due to the hot steam. Because the rice grains 51 have higher heat capacity and thermal conductivity after absorbing water and expanding, their cooling and shrinkage rate is much faster than that of the husks 52, resulting in a greater volume shrinkage of the rice grains 51 and a smaller shrinkage of the husks 52. This "thermal expansion and contraction difference" further widens the existing gaps. This dynamically changing gap makes the husks 52 more prone to localized breakage and peeling under the milling force, while the rice grains 51, due to their enhanced elasticity and uniform internal stress distribution, are less prone to cracking.

[0047] This "synergistic effect of thermal expansion and contraction" mechanism uses the thermal effect to soften the bonding force between rice grain 51 and rice husk 52, and strengthens the structural difference between the two through the cooling effect, making the dehulling process smoother and more controllable, achieving a better dehulling effect. At the same time, while ensuring grinding efficiency, it maximizes the protection of the integrity of rice grain 51 and reduces the water immersion rate of rice grain 51.

[0048] In some embodiments of this application, the rice milling unit 30 includes a rice milling chamber 32 and a rice milling roller 33. The rice milling chamber 32 forms a rice milling channel 31. The rice milling roller 33 is rotatably disposed within the rice milling channel 31 about its own axis. The paddy rice 50 entering the rice milling channel 31 is located between the surface of the rice milling roller 33 and the inner wall of the rice milling channel 31. At this time, during the rotation of the rice milling roller 33, it continuously grinds the paddy rice 50 and pushes the paddy rice 50 forward along the rice milling channel 31, so that the hulled paddy rice 50 can be discharged from the outlet of the rice milling channel 31.

[0049] Furthermore, the cooling unit 40 is configured to exchange heat with the rice milling roller 33 to reduce the surface temperature of the rice milling roller 33. Thus, by cooling the rice milling roller 33 through the cooling unit 40, the surface temperature of the rice milling roller 33 is kept at a lower temperature. This allows the paddy rice 50, heated by steam, to exchange heat with the rice milling roller 33 within the rice milling channel 31. The rice milling roller 33 continuously removes heat from the rice grains 51 and rice husks 52, rapidly cooling the rice grains 51 and rice husks 52 that were originally expanded due to the hot steam. This increases the gap between the paddy rice 50 and the rice grains 51, making it easier for the rice husks 52 to partially break and peel off under the grinding force of the rice milling roller 33, thereby improving the dehulling effect.

[0050] The cooling unit 40 can cool the rice milling roller 33 by means of air cooling, water cooling, etc. In actual use, while the cooling unit 40 outputs cold energy to reduce the surface temperature of the rice milling roller 33, the cooling unit 40 will also generate a certain amount of heat. Although the heat can be directly discharged, it will cause energy loss.

[0051] Therefore, in some embodiments of this application, the cooling unit 40 is configured to exchange heat with both the rice milling roller 33 and the spray unit 20. The cooling unit 40 outputs cooling energy to the rice milling roller 33 and outputs heat to the spray unit 20. Thus, the heat generated by the cooling unit 40 when cooling the rice milling roller 33 can be transferred to the spray unit 20. After receiving the heat, the spray unit 20 can use it to increase the temperature of the water vapor, enabling it to output water vapor at a temperature higher than that of the rice grains 50. By complementing the cooling and hot mist components, the energy consumption of the entire rice milling device is reduced.

[0052] Specifically, the spray unit 20 contains atomized water and an atomizing plate. The atomizing plate atomizes the water into water vapor. The spray unit 20 receives heat from the cooling unit 40 to heat the atomized water. The atomizing plate can be a piezoelectric ceramic. Through the high-frequency resonance of the piezoelectric ceramic, the liquid water molecules are broken up to produce a naturally drifting water mist. The heat transferred through the cooling unit 40 can raise the temperature of the atomized water, so that the atomized water vapor can meet the requirements for heating the rice 50.

[0053] In some other embodiments, the heat transferred from the cooling unit 40 to the spray unit 20 can be used directly to heat water vapor. In other embodiments, the spray unit 20 can also generate water vapor by heating water to boiling.

[0054] Specifically, in some embodiments, see [link to relevant documentation]. Figure 2The cooling unit 40 includes a compressor, a condenser 41, a throttle valve, and an evaporator 42. The compressor is connected to the condenser 41 by pipes, the condenser 41 is connected to the throttle valve by pipes, the throttle valve is connected to the evaporator 42 by pipes, and the evaporator 42 is connected to the compression molding machine by pipes. Thus, a refrigeration circuit is formed by the pipe connections between the compressor, the condenser 41, the throttle valve, and the evaporator 42. Refrigerant circulates in the refrigeration circuit. The condenser 41 is configured to exchange heat with the spray unit 20, and the evaporator 42 is configured to exchange heat with the rice milling roller 33.

[0055] In actual use, the compressor drives the refrigerant to circulate in the pipeline. The compressor compresses the low-temperature, low-pressure refrigerant gas from the evaporator 42 into a high-temperature, high-pressure gas. After entering the condenser 41, the high-temperature, high-pressure refrigerant gas releases heat into the spray unit 20 to heat the atomized water within the spray unit 20. Then, the high-temperature, high-pressure refrigerant gas is cooled and liquefied into a high-pressure liquid by the condenser 41. The high-pressure liquid passes through a throttling device, which causes a rapid drop in pressure and temperature, transforming it into a low-temperature, low-pressure liquid. As the low-temperature, low-pressure liquid refrigerant flows into the evaporator 42, it absorbs heat from the surface of the evaporator 42 and the rice milling roller 33, thus evaporating into gas and lowering the surrounding air temperature, thereby cooling the rice milling roller 33. Finally, the refrigerant returns to the compressor, completing the refrigerant cycle.

[0056] The evaporator 42 is an evaporation tube 43 located inside the rice milling roller 33. When the low-temperature and low-pressure liquid flows inside the evaporation tube 43, it can absorb the heat of the rice milling roller 33. Furthermore, by placing the evaporator 42 inside the rice milling roller 33, it does not occupy the volume of the surface of the rice milling roller 33, which is beneficial to the overall volume of the rice milling device.

[0057] Furthermore, the evaporator tube 43 extends in a tortuous manner within the rice milling roller 33 to increase the contact area between the evaporator tube 43 and the rice milling roller 33, thereby making it easier for cold energy to be transferred to the rice milling roller 33 and ensuring the cooling effect of the rice milling roller 33. It is understood that in some other embodiments, the evaporator 42 can also cool the rice milling roller 33 through direct contact.

[0058] In other embodiments, the cooling unit 40 may also be an existing structure capable of generating both heat and cold, such as a semiconductor cooling chip, and is not limited here.

[0059] In some embodiments of this application, the conveying unit 10 further includes a conveying inlet connected to the conveying channel 11. The conveying inlet can be opened or closed in a controlled manner. When the conveying inlet is open, the user can add rice 50 into the conveying channel 11 through the conveying inlet. After the user has added the rice 50, the conveying inlet can be closed so that the high-temperature water vapor sprayed by the spraying unit 20 can remain in the conveying channel 11, thereby increasing the overall humidity in the conveying channel 11. This increases the humidity of the air in the conveying channel 11, making the rice grains 51 easier to moisten, increasing the elasticity of the rice grains 51, and making the rice grains 51 less prone to breakage during the rice milling process.

[0060] Furthermore, the unit also includes a humidity sensor 21, which is located within the channel and can monitor the humidity within the conveying channel 11. In actual use, the humidity sensor 21 controls the air humidity within the conveying channel 11 to be maintained at around 50%, so that water vapor can both moisten the rice grains 51 and prevent the rice grains 51 from becoming too damp, which could lead to mold and bacteria growth if not cooked or dried immediately.

[0061] Furthermore, the unit includes a shell and an insulation component. A channel is formed inside the shell, and the insulation component covers the shell to maintain the temperature of the air inside the conveying channel 11, thereby maintaining the temperature of the rice 50 during the conveying process, so that the rice 50 can enter the rice milling channel 31 at a higher temperature.

[0062] The following combination Figure 1 The working process of the rice milling device in some embodiments of this application is described below:

[0063] Water vapor is sprayed into the conveying channel 11 through the spray unit 20. The temperature of the water vapor is controlled at 50-60℃, and the processing time is controlled at 3-5 seconds. This allows the surface of the rice 50 to absorb an appropriate amount of moisture, resulting in initial separation between the rice husk 52 and the rice grain 51. The humidity sensor 21 maintains the air humidity in the conveying channel 11 at around 50%. This humidity level moistens the rice grain 51, increasing its elasticity and making it less prone to breakage during milling. Simultaneously, the water vapor heats and expands the rice grain 51 and the rice husk, increasing their volume. Water has better thermal conductivity than rice grain 51 and rice husk 52. The rice grain 51 expands by about 3%-5% due to water absorption, while the rice husk 52 expands less due to slower heat conduction. Therefore, the expanded rice grain 51 expands the rice husk 52, creating gaps and achieving initial separation between the rice grain 51 and the rice husk 52.

[0064] Then, the rice grains 51 enter the rice milling channel 31 and are driven forward by the milling rollers. The low-boiling-point liquid in the evaporator 42 circulates in the milling rollers, carrying the heat from the milling rollers 33 to cool the rice grains 51 and the rice husks 52. After thermal expansion and contraction, the gap between the rice grains 51 and the rice husks 52 becomes larger, and they are squeezed and dehulled under the conveying action, thus preventing damage to the rice grains 51. This dynamically changing gap makes it easier for the rice husks 52 to undergo localized fracture and peeling under the action of milling force, while the rice grains 51 themselves are less prone to cracking due to increased elasticity and uniform internal stress distribution.

[0065] Some embodiments of this application also provide a rice milling machine, which includes the rice milling device as described above. Since the rice milling machine includes all the technical features of the rice milling device described above, it possesses all the technical effects of the rice milling device described above, and will not be repeated here.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A rice milling device, characterized in that, The rice milling device includes: The conveying unit (10) has a conveying channel (11) for transporting rice (50); A spray unit (20) is used to spray water vapor into the conveying channel (11), the temperature of which is greater than the surface temperature of the rice (50) entering the conveying channel (11); The rice milling unit (30) has a rice milling channel (31) for milling the paddy rice (50), and the rice milling channel (31) is connected to the conveying channel (11); Cooling unit (40) is used to cool the rice (50) located in the rice milling channel (31).

2. The rice milling device according to claim 1, characterized in that, The rice milling unit (30) includes a rice milling chamber (32) and a rice milling roller (33). The rice milling chamber (32) forms the rice milling channel (31). The rice milling roller (33) is rotatably disposed in the rice milling channel (31) about its own axis. The cooling unit (40) is configured to exchange heat with the rice milling roller (33) to reduce the surface temperature of the rice milling roller (33).

3. The rice milling device according to claim 2, characterized in that, The cooling unit (40) is configured to exchange heat with both the rice milling roller (33) and the spray unit (20). The cooling unit (40) is used to output cold energy to the rice milling roller (33) and to output heat energy to the spray unit (20).

4. The rice milling device according to claim 3, characterized in that, The cooling unit (40) includes a compressor, a condenser (41), a throttle valve, and an evaporator (42). The compressor, the condenser (41), the throttle valve, and the evaporator (42) are connected by pipes to form a refrigeration circuit. Refrigerant circulates in the refrigeration circuit. The condenser (41) is configured to exchange heat with the spray unit (20), and the evaporator (42) is configured to exchange heat with the rice milling roller (33).

5. The rice milling device according to claim 4, characterized in that, The evaporator (42) is an evaporation tube (43) located inside the rice milling roller (33).

6. The rice milling apparatus according to claim 5, characterized in that, The evaporation tube (43) extends in a zigzag pattern within the rice milling roller (33).

7. The rice milling apparatus according to claim 3, characterized in that, The spray unit (20) is provided with atomized water and atomizing plate. The atomizing plate is used to atomize the atomized water into water vapor. The spray unit (20) receives heat from the cooling unit (40) to heat the atomized water.

8. The rice milling apparatus according to claim 1, characterized in that, The conveying unit (10) further includes a conveying inlet, which is connected to the conveying channel (11) and can be opened or closed in a controlled manner.

9. The rice milling apparatus according to claim 1, characterized in that, The conveying unit (10) also includes a humidity sensor (21), which is located in the conveying channel (11).

10. The rice milling apparatus according to claim 1, characterized in that, The conveying unit (10) includes a conveying shell and an insulation component. The conveying channel (11) is formed inside the conveying shell, and the insulation component covers the conveying shell.

11. A household rice milling machine, characterized in that, Includes the rice milling apparatus as described in any one of claims 1-10.

Images