CN203274455U - Microwave drying device - Google Patents

Abstract

The utility model relates to a microwave drying device. The microwave drying device comprises a heating cavity, a microwave source working area and a fan. The heating cavity is used to place materials to be dried, and the microwave source working area is provided with a heating microwave source, the fan introduces cold air into the working area of the microwave source to cool down the microwave source, and discharges the generated hot air. The hot air; the hot air recycling device is connected with the hot air pipeline and sends the hot air into the heating chamber. According to the technical solution of the utility model, since the hot air exhausted from the microwave source working area is recovered and sent back to the heating chamber, the auxiliary hot air effect is performed on the materials being microwave-dried in the heating chamber, thereby effectively accelerating the drying process. The emission of water vapor on the surface of the material has a significant role in accelerating the drying process and improving the drying quality.

Description

Microwave drying device

technical field

The utility model relates to the field of microwave drying, in particular to a microwave drying device. the

Background technique

At present, in the process of drying materials (such as cheese) with microwave drying equipment, the microwave source generates microwaves for drying. Since the microwave source will generate high heat during work, the working area where the microwave source is located With a high temperature, if the microwave source is in a high temperature working state for a long time, it will affect the service life of the microwave source, so it is necessary to cool the microwave source and its working area. the

In the prior art, a fan is generally used to introduce cold air into the working area of the microwave source, and the cold air is discharged as hot air after contacting the microwave source, thereby cooling the microwave source and its working area. This cooling method discharges the generated hot air into the atmosphere, causing energy loss, which is not conducive to energy saving and emission reduction. Therefore, it is necessary to improve the above-mentioned defects existing in the prior art. the

Utility model content

The main purpose of the utility model is to provide a microwave drying device, which saves energy by recycling hot air. the

In order to achieve the above object, according to the utility model, a microwave drying device is provided, including a heating cavity, a microwave source working area and a fan, the heating cavity is used to place materials to be dried, and the microwave source working area is set There is a microwave source for heating, and the fan introduces cold air into the working area of the microwave source to cool down the microwave source and discharge the generated hot air. The microwave drying device also includes:

The hot air pipeline collects the hot air discharged from the fan;

The hot air recycling device is connected with the hot air pipeline and sends the hot air into the heating chamber. the

Further, the heating chamber is located below the working area of the microwave source, and the hot air recycling device is located below the heating chamber. the

Further, the hot air recycling device has a bottom surface that gradually slopes upward from upstream to downstream along the hot air conveying direction. the

Further, the microwave drying device also includes:

A temperature sensor is arranged in the working area of the microwave source and detects the temperature in the working area of the microwave source;

A temperature control unit is electrically connected with the temperature sensor and used to turn on and off the fan according to a set program. the

Further, the microwave drying device also includes:

A fan is used to introduce cool air into the working area of the microwave source. the

According to the technical solution of the utility model, since the hot air exhausted from the microwave source working area is recovered and sent back to the heating chamber, the auxiliary hot air effect is performed on the materials being microwave-dried in the heating chamber, thereby effectively accelerating the drying process. The emission of water vapor on the surface of the material has a significant role in accelerating the drying process and improving the drying quality. the

In addition, by setting the temperature sensor and the temperature control unit, the start/stop of the fan can be controlled in real time according to the actual temperature in the working area of the microwave source, which saves energy and reduces the loss of the fan. In addition, the first preset value, the second preset value and the predetermined time period are pre-calculated according to the specific conditions of the microwave source and the microwave source working area, and can be adjusted in time according to the actual temperature in the microwave source working area. The amount of cold air, so as to protect the microwave source more effectively and in time, avoid its long-term work at too high temperature, and improve the service life of the microwave source. the

Description of drawings

The accompanying drawings of the description are used to provide a further understanding of the utility model and constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is a schematic structural view of the microwave drying device of the present invention. the

Detailed ways

It should be noted that the features in the various embodiments of the present invention can be combined with each other in the absence of specific limitations or conflicts. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. the

Fig. 1 is a schematic structural view of the microwave drying device of the present invention. As shown in FIG. 1 , the microwave drying device includes a heating cavity 10 and a microwave source working area 20 . The material 11 to be dried is placed in the heating chamber 10, such as cheese and the like. These materials 11 can be spaced from each other and evenly placed in the heating chamber 10 as required, so as to ensure the uniformity of drying of the materials. the

The microwave source working area 20 is located above the heating chamber 10, in which one or more microwave sources 30 for generating microwaves are arranged. When there are multiple microwave sources 30 , these microwave sources 30 may be evenly distributed in the microwave source working area 10 as required. The microwave source 30 sends the generated microwaves into the heating cavity 10 through channels not shown in FIG. 1 , and heats the materials 11 to be dried in the heating cavity 10 . the

The microwave source 30 generates heat during the working process, so that the temperature in the microwave source working area 20 gradually rises. If the microwave source 30 works at a high temperature for a long time, the working life of the microwave source 30 may be shortened. In order to reduce the temperature in the microwave source working area 20 , a fan 40 is installed outside one side of the microwave source working area 20 . the

Referring to Fig. 1, since the microwave source working area 20 is located above the heating chamber 10, the microwave source working area 20 is at a higher position in the whole microwave drying device, therefore, the blower 40 can be set by a support structure (such as a support rod) At a suitable height, it is located outside the working area 20 of the microwave source. Thereby, it is convenient to lay pipes etc. connected with the blower 40, and it is also convenient to maintain or replace the blower 40 and its components. the

An exhaust passage (not shown in Fig. 1 ) for air discharge is provided between the microwave source work area 20 and the blower fan 40. Similarly, on other walls (such as front and rear sides or top surfaces of the microwave source work area 20, preferably There is also a channel for air circulation on the other side opposite to the position where the blower is set. the

When the fan 40 starts to work, due to its pumping action, the cold air outside the microwave source working area 20 is introduced into the microwave source working area 20 (as shown by arrow A), after contacting the microwave source 30 therein It becomes hot air, and then it is discharged out of the microwave source working area 20 through the exhaust channel between the fan 40 and the microwave source working area 20 (as shown by arrow B), and is collected by the fan 40 . the

The microwave drying device of the present utility model is also provided with a hot air pipeline 50 and a hot air recycling device 60 . The hot air pipeline 50 is connected with the fan 40, and sends the hot air collected by the fan 40 to the hot air recycling device 60 (as shown by arrow C). The hot air recycling device 60 is a cavity and is located below the heating cavity 10 . the

Referring to Fig. 1, the hot blast recycling device 60 has an inlet communicating with the hot blast pipeline 50, and also has a plurality of outlets communicating with the bottom surface of the heating chamber 10, except the inlet and the outlet, the hot blast recycling device 60 The rest are closed, forming a substantially closed cavity. the

Since the outlet of the hot air recycling device 60 is arranged on the bottom surface of the heating chamber 10, it is beneficial for the hot air to flow from bottom to top (as shown by arrow D), and it is possible to carry out microwave drying on the materials 11 in the heating chamber 10. The auxiliary hot air effectively accelerates the emission of water vapor on the surface of the material 11, which has a significant role in accelerating the drying process and improving the drying quality. the

In addition, as shown in Figure 1, the hot air recycling device 60 has a bottom surface that is gradually inclined from upstream to downstream along the hot air conveying direction, which can ensure that the hot air maintains a relatively uniform wind speed at the hot air outlet, thereby facilitating the hot air to pass through multiple The outlets are evenly sent to the heating chamber 10, which improves the uniformity of the auxiliary hot air effect and makes the material 11 in the heating chamber 10 heated more evenly. Of course, the inclination angle of the bottom surface can be specifically set according to actual conditions such as the size of the heating chamber, the hot air recycling device, and the amount of hot air. the

In the microwave drying device shown in FIG. 1 , if the blower 40 works continuously all the time, the energy consumption of the blower 40 may increase, which is also detrimental to the service life of the blower 40 . Therefore, a temperature sensor 80 may also be provided in the working area 20 of the microwave source. The temperature sensor 80 measures the temperature in the working area 20 of the microwave source, and sends the measured value to the temperature control unit not shown in FIG. 1 . The temperature control unit may compare the measured value with a preset first set value. The first set value is the pre-determined safe temperature in the working area of the microwave source. When the microwave source 30 works in an environment with a temperature below the first set value, its service life will not be affected basically. On the contrary, if If the microwave source 30 works in an environment with a temperature above the first set value for a long time, its working life will be affected. the

Therefore, if the measured value is higher than the first set value, the temperature control unit can send a signal to the fan 40 to start the fan 40 to cool down the microwave source working area 20; if the measured value is lower than the first set value, the temperature The control unit can send a signal to the fan 40 to not start or stop the fan 40 that has been started. the

In this way, when the temperature in the working area 20 of the microwave source does not damage the service life of the microwave source 30 , the fan 40 that has been started may not be started or stopped, thereby saving energy and avoiding unnecessary loss of the fan 40 . the

In addition, as shown in FIG. 1 , the microwave drying device may further include an axial flow fan 70 disposed on the top of the working area 20 of the microwave source. When the temperature measured by the temperature sensor 80 is higher than the second set value, in order to avoid relying on the fan 40 alone to quickly reduce the temperature of the microwave source 30, thereby affecting the service life of the microwave source 30, the temperature control unit can turn on the axial flow fan 70. Increase the amount of cold air entering into the microwave source working area 20. When the temperature measured by the temperature sensor 80 is lower than the second set value, the temperature control unit turns off the axial flow fan 70 to avoid unnecessary energy consumption. Alternatively, the temperature control unit may not turn off the axial flow fan 70 until the measured temperature is lower than the first set value, so that the working area of the microwave source and the microwave source can be cooled more rapidly. the

The second set value can be pre-determined and set according to the specific conditions of the microwave source and the microwave source work area, and its value is higher than the aforementioned first set value. If the temperature in the microwave source work area is higher than the second set value, indicating that the microwave source 30 is already in a dangerous state, and the temperature in the working area of the microwave source needs to be lowered as soon as possible. the

In addition, besides the second set value, the start condition of the axial flow fan 70 may also be a period of time when the temperature in the working area of the microwave source 20 is above the first set value. If the temperature in the microwave source working area 20 does not exceed the second set value, but has exceeded the first set value, and has gone through a time exceeding a predetermined period of time, it indicates that the microwave source 30 has not been cooled in time, which may also affect its service life. The predetermined time period can be determined and set in advance according to the specific conditions of the microwave source and the working area of the microwave source, so as to ensure that the microwave source will not work in an environment exceeding the first set value for a long time. the

In this way, it can be ensured that the temperature in the working area 20 of the microwave source does not exceed the second set value as much as possible, or does not stay in a state of exceeding the first set value for a long time, thereby further protecting the microwave source 30 . the

The microwave drying device of the present invention has been described above according to the embodiments, but the device is not limited to the components and/or connections described in the embodiments, for example, the heating chamber, the microwave source work area, the fan and the hot air return Devices and the like are not limited to the positional relationship in this embodiment, as long as the hot air discharged from the working area of the microwave source can be sent back to the heating chamber, the purpose of the utility model can be realized; Others have fans that move the air. the

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model. the

Claims (5)

1. drying device by microwaves, comprise heating chamber, microwave source workspace and blower fan, described heating chamber is used for placing material to be dried, described microwave source workspace is provided with the microwave source of heating use, described blower fan is that described microwave source workspace introducing cold air is that the hot-air that produces is lowered the temperature, also discharged to described microwave source, it is characterized in that, described drying device by microwaves also comprises:

Hot-blast pipe line is collected the hot-air that described blower fan is discharged;

Hot blast recycling device is connected with described hot-blast pipe line and described hot-air is sent in described heating chamber.

2. drying device by microwaves according to claim 1, is characterized in that, described heating chamber is positioned at the below of described microwave source workspace, and described hot blast recycling device is positioned at the below of described heating chamber.

3. drying device by microwaves according to claim 2, is characterized in that, described hot blast recycling device has along the hot blast throughput direction and is from upstream to acclivitous bottom surface gradually, downstream.

4. the described drying device by microwaves of any one according to claim 1 to 3, is characterized in that, described drying device by microwaves also comprises:

Temperature sensor is arranged in described microwave source workspace and detects temperature in described microwave source workspace;

Temperature control unit is electrically connected to described temperature sensor and is used for opening and closing by setup program described blower fan.

5. drying device by microwaves according to claim 4, is characterized in that, described drying device by microwaves also comprises:

Fan is used to described microwave source workspace introducing cold air.

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