Temperature measuring structure of a roaster

Abstract

The utility model provides a kind of temperature measuring structure of baking machine, for measuring the real-time temperature of the bean storehouse inside of baking machine to be heated, including temperature measuring component, the temperature measuring component includes temperature sensor and sensor support, the temperature sensor is installed on the sensor support, the temperature measuring end of the temperature sensor is inserted into the bean storehouse inside, the temperature measuring end is contacted with the bean storehouse bottom to be heated.The utility model completely overcomes the defects that prior art can only indirectly measure bean temperature, so that temperature measuring end directly contacts to be heated, so as to accurately measure bean temperature;The temperature measuring structure of the utility model is suitable for traditional baking machine with stirring device, also suitable for new baking machine without stirring device, can realize the effect of accurately measuring bean temperature.

Description

Technical Field

[0001] This utility model relates to a temperature measuring structure for a roasting machine, and more particularly to a temperature measuring structure that can more accurately measure the temperature of beans. Background Technology

[0002] When roasting coffee beans, it is usually necessary to constantly monitor and control the heating temperature to prevent overheating or undercooking. The accuracy of bean temperature measurement determines the quality of the roast. In existing technologies, the installation location of the temperature sensor is a decisive factor in the accuracy of bean temperature measurement.

[0003] Chinese utility model patent CN220088515U discloses a roasting mechanism for a coffee bean roaster, including a fan module, a heating module located above the fan module, a container located above the heating module with its opening facing upwards and communicating with the roasting space, a temperature sensor exposed in the container, a stirring module installed in the container, and a controller exposed on the outer periphery of the base. The temperature sensor senses the temperature inside the container and generates a corresponding sensing signal. When the controller is activated to start roasting, it controls the stirring module to stir the coffee beans inside the container, controls the fan module to start generating airflow towards the heating module, and controls the heating temperature of the heating module based on a set roasting temperature and the sensing signal from the temperature sensor to generate the required roasting airflow. However, the stirring module is located at the center of the container and rotates around its central axis to stir the coffee beans. The temperature sensor is located at the edge outside the center of the container and is also located along the path of the roasting airflow. This causes the temperature sensor to measure the temperature of the roasting airflow, not the actual bean temperature, leading to inaccurate temperature measurement.

[0004] Chinese utility model patent CN216493371U discloses a detachable coffee bean roaster. The metal roasting cylinder has ventilation holes at the bottom, below which are a guide plate, a protective cover, and a heating element. The protective cover contains a temperature sensor. Since the temperature of the metal roasting cylinder is transferred to the protective cover through thermal radiation, the temperature inside the metal roasting cylinder is estimated by measuring the temperature of the protective cover. However, this method still does not directly measure the bean temperature, and because it relies on the temperatures of the metal roasting cylinder and the protective cover for measurement, the result deviates significantly from the actual bean temperature. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a temperature measuring structure for a roasting machine that directly measures the temperature of beans, so as to overcome the above-mentioned defects in the prior art.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a temperature measuring structure for a roasting machine, used to measure the real-time temperature of the material to be heated inside the bean hopper of the roasting machine, including a temperature measuring component, the temperature measuring component including a temperature sensor and a sensor bracket, the temperature sensor being installed on the sensor bracket, the temperature measuring end of the temperature sensor extending into the bean hopper, and the temperature measuring end contacting the material to be heated at the bottom of the bean hopper.

[0007] Furthermore, the sensor bracket has an upper ventilation hole that runs vertically through the sensor, and the upper ventilation hole guides a portion of the ambient temperature airflow to form an ambient temperature air curtain around the temperature measuring end.

[0008] Furthermore, a heating component is provided below the bean hopper, and a temperature measuring component is located between the bottom of the bean hopper and the heating component. The heating component includes a heating space and a non-heating space, and a portion of the ambient temperature airflow enters the upper ventilation hole through the non-heating space.

[0009] Furthermore, the non-heated space is located inside the heating component, and the heated space is located outside the non-heated space.

[0010] Furthermore, a second connector is provided between the heating component and the fan component, the second connector having a through-hole at the bottom, and the through-hole, the non-heated space and the upper vent are connected in sequence.

[0011] Furthermore, the second connector has an outer peripheral surface that guides another portion of the ambient temperature airflow into the heating space.

[0012] Furthermore, a stirring device is installed inside the bean hopper, and the stirring device avoids the temperature measuring end.

[0013] Furthermore, the temperature measuring end is located at the non-geometric center of the sensor bracket, and the rotation axis of the stirring device passes through the geometric center of the sensor bracket.

[0014] Furthermore, the soybean bin has an inclined air duct that guides the ambient temperature airflow into the interior of the soybean bin and causes it to spiral upwards.

[0015] Furthermore, the inclined air duct is located on the side wall or bottom of the bean hopper.

[0016] Compared with the prior art, the advantage of this utility model is that it completely overcomes the defect of the prior art that can only indirectly measure the temperature of beans, so that the temperature measuring end can directly contact the object to be heated, thereby accurately measuring the temperature of beans; the temperature measuring structure of this utility model is applicable to traditional roasting machines with stirring devices, as well as new roasting machines without stirring devices, and can achieve the effect of accurately measuring the temperature of beans. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the temperature measuring structure of the baking machine of this utility model; Figure 2 This is a schematic diagram of the temperature measuring component of the baking machine according to this utility model; Figure 3 This is a schematic diagram of the structure of the baking temperature measuring component and the heating component of this utility model; Figure 4 This is a schematic diagram of the end cap of the temperature measuring structure of the baking machine according to this utility model.

[0018] Explanation of reference numerals in the attached figures: 100-Outer shell, 111-Inner bottom surface, 130-Top cover, 131-Top surface, 132-Elongated through hole, 133-Center hole of top cover, 140-Sealing ring, 150-First connector, 151-Inner circumferential surface, 152-First upper edge, 153-Second upper edge; 200 - Heating component, 201 - Fin, 210 - Inner ring support, 220 - Outer ring support; 400-Temperature measuring component, 410-Sensor bracket, 411-Upper ventilation hole, 420-Temperature sensor, 421-Temperature measuring end, 422-Fixing part; 500 - Second connector, 501 - Outer peripheral surface, 510 - Extension channel, 520 - Lower ventilation hole; 600-Motor, 610-Fan, 620-Circuit board, 630-Motor bracket, 640-Motor protective cover; 800-Bean bin, 810-End cap, bottom surface-811, 812-Air inlet, 813-Center hole of end cap, 815-Ventilation hole of end cap. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] Reference Figure 1-4 The baking machine of this utility model includes a hot air mechanism located at the bottom of the baking machine and a bean hopper 800 located above the hot air mechanism. The bean hopper 800 is used to load beans or nuts that need to be baked (hereinafter referred to as "the material to be heated"). The bean hopper 800 is connected to the hot air mechanism, and the hot air generated by the hot air mechanism can directly enter the interior of the bean hopper 800 through the opening at the bottom of the bean hopper 800.

[0021] The hot air mechanism includes a housing 100, with a heating element 200 mounted on the upper part of the housing 100 and a fan assembly mounted on the lower part. The upward airflow at room temperature generated by the fan assembly is heated by the heating element 200 and then continues upward into the bean hopper 800. The fan assembly includes a motor 600 and a fan 610 located at the bottom of the motor 600. The top of the motor 600 is a circuit board 620, and the motor 600 has a motor bracket 630 on its exterior. In one embodiment, the effective diameter of the fan 610 is smaller than the inner diameter of the motor bracket 630, allowing the airflow generated by the fan 610 to pass through the annular gap between the motor 600 and the motor bracket 630. Figure 2 As shown; in one embodiment, the annular gap is divided into several air intake channels by evenly distributed partitions 631. The motor bracket 630 has a motor protective sleeve 640 on its exterior, which is used to fix the motor 600 to the lower part of the housing 100.

[0022] In one embodiment, the roaster does not have a stirring mechanism. To achieve dynamic suspension of the material to be heated for uniform heating, the motor 600, in addition to driving the fan 610 to introduce room temperature air, also drives the fan 610 to continue blowing the heated air upwards into the bean hopper 800 to keep the material dynamically suspended. Therefore, the power of the motor 600 must meet certain requirements. In one embodiment, the motor 600 is a brushless motor with a power range of 20W-120W. In the roaster of this invention, utilizing the air duct structure, tests have shown that the relationship between the power of the brushless motor and the weight of the coffee beans in the bean hopper 800 is approximately as follows: the minimum power required to suspend 50g of coffee beans in the bean hopper 800 is 20W; the power required to suspend 100g of coffee beans in the bean hopper 800 is approximately 30W; the power required to suspend 300g of coffee beans in the bean hopper 800 is approximately 75W; and the power required to suspend 500g of coffee beans in the bean hopper 800 is approximately 120W. In other embodiments, the motor 600 can have a higher power output, as long as it enables the material to be heated to dynamically suspend within the bean hopper 800. The term "dynamic suspension" in this invention refers to the following: firstly, under the influence of hot air from below the material, the material undergoes irregular three-dimensional motion within the bean hopper 800. Subsequently, the material collides with itself and with the inner wall of the bean hopper 800. From the user's perspective, the material appears to tumble and jump within the bean hopper 800, without remaining stationary in any particular position for an extended period, until roasting is complete, the hot air stops blowing upwards, and the material descends and accumulates at the bottom of the bean hopper 800.

[0023] In one embodiment, to better secure the heating assembly 200, the heating assembly 200 is connected to the housing 100 via a first connector 150. The first upper edge 152 of the first connector 150 is fixedly connected to the upper part of the housing 100, and the second upper edge 153 of the first connector 150 is sealed to the top of the heating assembly 200 by a sealing ring 140 to prevent improper leakage of heated air.

[0024] like Figure 1 As shown, in one embodiment, the heating assembly 200 includes an inner ring support 210, with an electric heating wire (not shown) disposed on the outside of the inner ring support 210, and the interior of the inner ring support 210 is hollow. In one embodiment, fins 201 are evenly distributed circumferentially on the inner ring support 210, extending radially outward from the outer wall of the inner ring support 210, and an electric heating wire is disposed between every two adjacent fins 201, which heats the air around them when energized. In one embodiment, the heating assembly 200 also includes an outer ring support 220, forming an annular heating space between the outer ring support 220 and the inner ring support 210, and is vertically continuous. The outer ring support 220 serves as the endpoint of the outward extension of the fins 201, and the outer ring support 220, fins 201, and inner ring support 210 together divide the space into multiple small heating units, each containing an electric heating wire. In one embodiment, each heating unit corresponds to an air intake channel.

[0025] The top of the housing 100 has a top cover 130, which has annularly distributed elongated through holes 132. In one embodiment, such as... Figure 1 , Figure 3 As shown, when the heated air passes through the elongated through-hole 132 and exits at a certain angle, when the wind speed reaches a certain level, the airflow passing through the elongated through-hole 132 will gradually form a spiral upward airflow, rather than a direct upward airflow, which is conducive to better blowing the object to be heated in the bean hopper 800 until the object to be heated is dynamically suspended in the bean hopper 800. This state can ensure more uniform heating.

[0026] In one embodiment, such as Figure 1 and Figure 4 As shown, the bottom surface 811 of the end cap 810 is partially or completely fitted with the top surface 131 of the top cap 130, which can minimize the loss of hot air. In another embodiment, the top cap 130 and the end cap 810 are integrally formed, so the elongated through hole 132 and the air inlet 812 form an integral inclined air duct. The annular heating space corresponds to the above-mentioned annularly distributed elongated through holes 132 or inclined air ducts. In one embodiment, the upper opening of the heating space of the heating component 200 corresponds to one or more elongated through holes 132 or inclined air ducts. In other embodiments, the inclined air duct is set on the side wall of the bean hopper 800, but the blowing effect may not be as good as the inclined air duct located at the bottom of the bean hopper 800.

[0027] like Figure 1 As shown, the ambient temperature airflow generated by the fan 610 moves upward from the annular gap between the motor 600 and the motor bracket 630 until it reaches the annular heating space of the heating component 200. After being heated by the electric heating wire, the ambient temperature airflow continues to move upward through the inclined air duct and is guided as spiraling hot air. In one embodiment, the heating component 200 is directly connected to the fan component, and the ambient temperature airflow enters the heating space directly through the fan component; in another embodiment, the heating component 200 and the fan component are connected by a second connector 500, the upper part of the second connector 500 is connected to the lower part of the inner ring bracket 210 of the heating component 200, and the lower part of the second connector 500 is connected to the upper part of the fan component. The outer peripheral surface 501 of the second connector 500 can block the ambient temperature airflow from entering the interior of the second connector 500 and guide the ambient temperature airflow to move towards the heating component 200 along the outer peripheral surface 501; in one embodiment, as Figure 1 As shown, the bottom of the first connector 150 has a downward and inwardly tapering inner circumferential surface 151. The inner circumferential surface 151, together with the outer circumferential surface 501 of the second connector 500 and the inner bottom surface 111 of the upper part of the outer shell 100, guides the ambient temperature airflow into the heating space.

[0028] In one embodiment, the second connector 500 includes an extension channel 510 for arranging electrical wiring for the various components of the baking machine.

[0029] In some embodiments, the positional relationship between the heating component 200 and the fan component does not necessarily have to be the same as described above. The heating component 200 is positioned above the fan component to quickly blow the heated air into the bean hopper 800 and minimize heat loss. However, it is possible that in some designs, the fan component may be placed above the heating component 200 or in other locations, which may result in poorer performance, but roasting can still be completed as long as the working time is long enough. In other embodiments, the structure of the heating component 200 does not necessarily have to be the same as described above. The airflow heated by the heating component 200 does not necessarily have to be a spiral upward airflow. As long as the upward thrust generated by the heated airflow is sufficient to dynamically suspend the object to be heated within the bean hopper 800, it is acceptable. Therefore, the heating component 200 does not necessarily have to be hollow or have an annular heating space, and the heating space does not necessarily have to be uniformly or unevenly spaced. As long as the heating component 200 can heat the air around it, it is acceptable. Those skilled in the art can understand and implement this, and it will not be described in detail here. Similarly, the top cover 130 and the end cover 810 only need to allow the heated airflow to pass through and enter the bean hopper 800, blowing the object to be heated to make it suspend. The corresponding elongated through hole 132 and the air inlet 812 tilt angle (i.e. tilted air duct) are also not necessary. Even if the rising hot air does not rise in a spiral (e.g., rises directly), as long as the upward thrust generated by the heated airflow is sufficient to make the object to be heated dynamically suspend in the bean hopper 800.

[0030] like Figure 1 , Figure 2 As shown, the temperature measuring component 400 is located between the top cover 130 and the heating component 200. The temperature measuring component 400 includes a sensor bracket 410 and a temperature sensor 420. The temperature measuring end 421 of the temperature sensor 420 extends from the geometric center of the sensor bracket 410. The fixing part 422 of the temperature sensor 420 is fixedly connected to the sensor bracket 410. The temperature measuring end 421 extends into the bottom of the bean hopper 800 and is in direct contact with the material to be heated piled at the bottom of the bean hopper 800, or is in intermittent direct contact with the material to be heated that is dynamically suspended at the bottom of the bean hopper 800. In one embodiment, as... Figure 3 and Figure 4 As shown, the temperature measuring end 421 extends into the bottom of the bean hopper 800 through the center holes (center hole 133 of the top cover and center hole 813 of the end cover) of the top cover 130 and the end cover 810 respectively.

[0031] In one embodiment, such as Figure 1 , Figure 3 As shown, the sensor bracket 410 has vertically penetrating upper ventilation holes 411. Two or more upper ventilation holes 411 are distributed around the temperature measuring end 421. When room temperature air from below the sensor bracket 410 passes upward through the upper ventilation holes 411, the continuously rising room temperature airflow forms a room temperature air curtain around the temperature measuring end 421. This way, even if hot air enters the bean hopper 800, it will be isolated by the room temperature air curtain, ensuring that the temperature measuring end 421 measures the temperature of the object to be heated, rather than the temperature of the hot air, or at least minimizes the interference of hot air on the accuracy of temperature measurement, thereby further improving the accuracy of temperature measurement. In one embodiment, as... Figure 4 As shown, the end cap 810 has an end cap ventilation hole 815 corresponding to the upper ventilation hole 411; the top cap 130 also has a top cap ventilation hole corresponding to the upper ventilation hole 411, which is not shown in the figure. Those skilled in the art will understand this and will not elaborate further.

[0032] In one embodiment, such as Figure 1 , Figure 3As shown, the second connector 500 has a vertically penetrating lower ventilation hole 520. Most of the ambient air from below the second connector 500 is guided by the outer peripheral surface 501 into the heating space outside the inner ring support 210. A small amount of ambient air enters the non-heated space inside the inner ring support 210 through the lower ventilation hole 520 and continues to rise through the upper ventilation hole 411, forming an ambient air curtain around the temperature measuring end 421. In one embodiment, the lower ventilation hole 520 is the vertical projection of the upper ventilation hole 411 onto the second connector 500. In this case, ambient air can rise into the bean hopper 800 with minimal resistance, thus forming a high-speed ambient air curtain. In other embodiments, the lower ventilation holes 520 can be distributed in other ways, as long as they can guide ambient air into the non-heated space inside the inner ring support 210. The number of ventilation holes should not be excessive; the formed ambient air curtain only needs to effectively insulate against hot air. Too many holes will affect the roasting efficiency.

[0033] In one embodiment, the top cover 130 and the end cover 810 are hollow in the parts corresponding to the sensor bracket 410, and the sensor bracket 410 fills the hollow parts. The top cover 130 and the end cover 810 are connected to the edge of the sensor bracket 410, or the sensor bracket 410, the top cover 130 and the end cover 810 can be set as an integral structure. The temperature measuring end 421 protrudes from the center of the sensor bracket 410 and extends directly into the bean hopper 800.

[0034] In one embodiment, the temperature measuring ends 421 are located on a non-geometric center of the sensor bracket 410, and the number can be greater than or equal to two. The temperature measuring ends 421 are centrally or axially symmetrically distributed with respect to the geometric center of the sensor bracket 410. In this case, the geometric center or central axis of the sensor bracket 410 can be used to install a stirring device, that is, the rotation axis of the stirring device passes through the geometric center of the sensor bracket 410, so as to be suitable for conventional roasting machines with stirring devices. However, the temperature measuring ends 421 are always located inside the aforementioned ambient temperature air curtain and extend into the bean hopper 800. When the stirring device stirs the material to be heated in the bean hopper 800, there is always a gap between it and the temperature measuring ends 421, and it will not directly contact the temperature measuring ends 421. That is, the stirring device itself avoids the temperature measuring ends 421, but it will move the material to be heated and bring the material to be heated into contact with the temperature measuring ends 421.

Claims

1. A temperature measuring structure for a roasting machine, used to measure the real-time temperature of the material to be heated inside the bean hopper of the roasting machine, characterized in that: The device includes a temperature measuring component, which includes a temperature sensor and a sensor bracket. The temperature sensor is mounted on the sensor bracket, and the measuring end of the temperature sensor extends into the bean hopper, where it contacts the object to be heated at the bottom of the bean hopper.

2. The temperature measuring structure of the baking machine according to claim 1, characterized in that: The sensor bracket has a through-hole at the top and bottom, which guides a portion of the ambient temperature airflow to form an ambient temperature air curtain around the temperature measuring end.

3. The temperature measuring structure of the baking machine according to claim 2, characterized in that: A heating component is installed below the soybean hopper, and a temperature measuring component is located between the bottom of the soybean hopper and the heating component. The heating component includes a heating space and a non-heating space, and a portion of the ambient temperature airflow enters the upper ventilation hole through the non-heating space.

4. The temperature measuring structure of the baking machine according to claim 3, characterized in that: The non-heated space is located inside the heating component, and the heated space is located outside the non-heated space.

5. The temperature measuring structure of the baking machine according to claim 4, characterized in that: The heating component and the fan component are connected by a second connector, which has a through-hole at the bottom. The through-hole at the bottom, the non-heated space and the through-hole at the top are connected in sequence.

6. The temperature measuring structure of the baking machine according to claim 5, characterized in that: The second connector has an outer peripheral surface that guides another portion of the ambient temperature airflow into the heating space.

7. The temperature measuring structure of the baking machine according to claim 2, characterized in that: The bean hopper is equipped with a stirring device that avoids the temperature measuring end.

8. The temperature measuring structure of the baking machine according to claim 7, characterized in that: The temperature measuring end is located at the non-geometric center of the sensor bracket, and the rotation axis of the stirring device passes through the geometric center of the sensor bracket.

9. The temperature measuring structure of the baking machine according to any one of claims 2-6, characterized in that: The soybean bin has an inclined air duct that guides the ambient temperature airflow into the interior of the soybean bin and causes it to spiral upwards.

10. The temperature measuring structure of the baking machine according to claim 9, characterized in that: The inclined air duct is located on the side wall or bottom of the bean silo.

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