Drying box

Abstract

The invention provides a drying box. The drying box comprises a box body, a heating device, a partition plate in the box, a circulating fan and a drainage groove. The box body is provided with a box door and a drainage groove; the box door is hinged to the box body; the in-box partition plate is arranged in the box body and divides the inner space of the box body into a material evaporation area and a water vapor extraction area; the material evaporation area is used for placing and drying materials; the water vapor extraction area is used for extracting and discharging water vapor; at least one pair of exhaust channels are symmetrically arranged on the partition plate in the box and are used for circular circulation of gas between the material evaporation area and the water vapor extraction area; the heating device is arranged in the material evaporation area; the circulating fan is arranged in the material evaporation area and / or the water vapor extraction area; and the drainage tank is arranged at the bottom of the box body in the water vapor extraction area. The technical problems that based on a conventional electric heating mode at present, the electric energy conversion efficiency and the drying efficiency are not high, and the device cannot be suitable for other specific environments and needs to be improved are solved.

Description

Technical Field

[0001] The present invention application relates to the technical field of material drying, and particularly relates to a drying box. Background Art

[0002] A drying box is a device specifically used for drying materials and fabrics. In the prior art, drying boxes or other types of drying and baking equipment generally use conventional electric heating for drying. To accelerate the evaporation rate of wet materials, it is necessary to increase the temperature of the wet materials and at the same time use a fan to blow away the wet air around the wet materials. The conventional electric heating drying equipment adopts a "hair dryer" scheme similar to drying hair.

[0003] In the conventional electric heating method, the highest conversion rate of electric energy into heat energy is only 100%, that is: using 10 kW of electric energy can at most obtain 10 kW of heat energy. However, in the actual use process, the energy conversion will cause energy loss, and it is often impossible to reach 100% conversion rate.

[0004] At the same time, in the prior art, in the conventional scheme of using a fan to blow away the wet air around the wet materials, the inhaled is ambient air, and the relative humidity of the ambient air may be very high. In case of cold and damp weather, the inhaled must be wet and cold air, which will easily lead to low drying efficiency, and this technical scheme cannot be applied to other complex specific environments. Summary of the Invention

[0005] The embodiments of the present invention application provide a drying box to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention application provides the following technical solution: A drying box, comprising a box body, a heating device, an internal box partition, a circulation fan, and a drainage trough; the box body is provided with a box door and a drainage trough; the box door is hinged to the box body; the internal box partition is arranged inside the box body, and the internal box partition divides the internal space of the box body into a material evaporation area and a water vapor extraction area; the material evaporation area is used for placing and drying materials; the water vapor extraction area is used for extracting and discharging water vapor, and at least a pair of exhaust channels are symmetrically arranged on the internal box partition for the circular flow of gas between the material evaporation area and the water vapor extraction area; the heating device is arranged in the material evaporation area; the circulation fan is arranged in the material evaporation area and / or the water vapor extraction area; the drainage trough is arranged at the bottom of the box body in the water vapor extraction area.

[0007] Preferably, the internal box partition can be horizontally or vertically arranged inside the box body.

[0008] Preferably, the internal box partition is detachably fixed to the inner wall of the box body.

[0009] In a further preferred embodiment, the inner partition of the box can adjust the ratio of the space of the material evaporation area to the space of the water vapor extraction area by adjusting the installation position of the inner partition on the inner wall of the box according to the size of the material.

[0010] Preferably, the heating device is a condenser.

[0011] In a further preferred embodiment, the drying box further includes a compressor, an expansion valve, and an evaporator; the compressor is connected in series with the condenser, the expansion valve, and the evaporator through pipelines to form a closed loop; the compressor and the expansion valve are arranged outside the box body, and the evaporator is arranged in the water vapor extraction area. The condenser is in a sheet structure.

[0012] Preferably, the sheet structure is arranged as one or more sheets.

[0013] In a further preferred embodiment, the exhaust passage and the drain trough are also provided with one-way valves to prevent the backflow of gas or liquid.

[0014] In some specific embodiments, by setting the inner partition of the box, the inside of the drying box is divided into two parts, namely the material evaporation area and the water vapor extraction area. At the same time, there are gaps between both sides of the inner partition and the box wall to form a channel for air circulation inside the box body for the circulation of gas.

[0015] The ratio of the space size between the material evaporation area and the water vapor extraction area can be adjusted manually. The size of the material evaporation area mainly depends on the amount of material placed; the minimum setting of the space of the water vapor extraction area depends on the size of the evaporator.

[0016] The position of the circulation fan can be set on one side of the inner partition or on both sides. When set in the material evaporation area, during operation, the circulation fan inhales relatively dry air from the water vapor extraction area, drives the air to pass through the condenser and be heated first, and then blows over the (wet) material to accelerate the evaporation of the wet material. The air carrying more water vapor enters the water vapor extraction area through the exhaust passage.

[0017] In the embodiment of the present application, the drying box can be used for drying materials, fabrics, etc., such as a large number of bed sheets washed in a laundry.

[0018] It is especially suitable for weather with high air humidity, such as the plum rain season, the period of humid weather, etc., especially at night, when the relative air humidity can reach 100%RH. At this time, it is not easy to dry clothes by the convective heat transfer method.

[0019] Evaporation: is a process in which liquid water becomes gaseous water that can occur at any temperature. The three elements to accelerate the evaporation rate (kg / s): the increase in the temperature of the material, the decrease in the humidity around the material, and the large evaporation area.

[0020] In the embodiment of the present application, the condenser is responsible for raising the temperature of the material, and the evaporator is responsible for reducing the humidity around the material.

[0021] Using the heat dissipation of the condenser in the refrigeration system as a heat source to increase the temperature of the material. The typical condensation temperature is +50 °C, which not only speeds up the evaporation rate but also does not damage the material, and the working temperature can be controlled.

[0022] And using the evaporator in the refrigeration system for refrigeration, acting as a trapping pump to condense water vapor and reduce the amount of water vapor in the air inside the box. The typical evaporation temperature is +5 °C, that is, water vapor will condense on the surface of the evaporator and flow out of the box through the drain trough, but water vapor will not freeze on the surface of the evaporator, and the working temperature can be constant.

[0023] According to the first law of thermodynamics:

[0024] The heat dissipation Q of the condenser k = the refrigeration capacity Q of the evaporator o + the input power Q of the compressor AL

[0025] It is known that: the energy efficiency ratio = the refrigeration capacity Q of the evaporator o / the input power Q of the compressor AL

[0026] At present, the technology for controlling the pressure of the evaporator and condenser in the refrigeration system is very mature. By controlling the pressure of the evaporator and condenser, the temperature of the evaporator and condenser can be controlled (the principle is that under the saturated state, the saturated temperature and saturated pressure have a monotonically increasing relationship), that is, through the mature pressure control technology, we can obtain the ideal water vapor condensation temperature and material drying temperature.

[0027] In the embodiment of the present application:

[0028] 1. Using the condenser for high-efficiency heating

[0029] For a set of refrigeration system, it is normal for the energy efficiency ratio to reach 3 or above under the equipment working conditions. That is: when using a refrigeration system with an energy efficiency ratio of 3, when the input power Q of the compressor AL is 10 kW, the refrigeration capacity Q of the evaporator o is 30 kW, and at the same time the heat dissipation Q of the condenser k is 10 + 30 = 40 kW. That is: about 40 kW of heat energy can be obtained by using 10 kW of electric energy (at the condenser end).

[0030] 2. Using the evaporator as a trapping pump

[0031] Definition of the trapping pump: The trapping pump is a vacuum pump that uses a refrigeration system to cool and condense a gas or vapor into a liquid, thereby trapping it from the gas stream to reduce the amount of the gas or vapor.

[0032] In the embodiments of the present application, the evaporator in the refrigeration system is used as a cold source to condense water vapor, which is equivalent to using a vacuum pump to extract water vapor.

[0033] 3. Design calculation

[0034] A. Calculate Q o :

[0035] In the embodiments of the present application, when the input power Q of the compressor AL is 10 kW, the refrigerating capacity Q of the evaporator o is calculated as 30 kW.

[0036] B. Calculate the load of the evaporator - fan part:

[0037] A drying oven equipped with a 40 kW electric heater usually has a circulating fan with a power of 3 - 5 kW. In the embodiments of the present application, the heat dissipation of the condenser is about 40 kW. Therefore, the motor of the circulating fan is also calculated as a maximum of 5 kW.

[0038] C. Calculate the load of the evaporator - moisture content of the material:

[0039] In the embodiments of the present application, it is assumed that the material is a bedsheet, each bedsheet weighs 1 kg, and the weight of the wet bedsheet after washing and spin - drying is 1.2 kg. That is, the moisture content of the bedsheet to be dried is 0.2 kg / 1 kg of dry bedsheet.

[0040] D. Latent heat of vaporization of water: Calculated as 2500 kJ / kg.

[0041] E. Calculate the load of the evaporator - sensible heat of water vapor:

[0042] The sensible heat of 1 kg of water vapor from about +45 °C (5 °C lower than the condensation temperature) cooling down to +5 °C is approximately 1.85 kJ / kg°C * 1 kg * (45 - 5) °C = 74 kJ (physical common sense: compared with the latent heat of 2500 kJ, the numerical value of the sensible heat of 74 kJ is very small)

[0043] In the embodiments of the present application, for a drying oven with a compressor input power of 10 kW + a fan power of 5 kW, by calculating the condensation rate of water vapor, the number of bedsheets that can be dried per hour is calculated as:

[0044] (Refrigerating capacity 30 kW - mechanical work of the fan 5 kW) / (2500 + 74) kJ / kg / 0.2 kg / 1 kg of dry bedsheet = 0.0485 kg of dry bedsheet / s

[0045] It can be obtained from the above that about 175 bedsheets can be dried per hour.

[0046] That is, a drying oven with an electric power consumption of about 15 kW, where 10 kW is for the input power of the compressor and 5 kW is for the circulating fan drive motor, can replace an electric heating drying oven with an electric power of about 45 kW and can dry about 175 dry bed sheets per hour (calculated at 1 kg per dry bed sheet and 1.2 kg after washing and spin-drying).

[0047] The technical solution of this application can also be used in other application scenarios for moisture removal, especially in an environment above normal temperature where heating is required and there is a need to be isolated from the environment. For example:

[0048] 1. There is a need for explosion protection of the material. By adopting the technical solution of this application, since the condenser and the evaporator are only heat exchangers and do not require additional explosion protection treatment, while the electric heaters of the existing technology need to be specially explosion-proof treated.

[0049] 2. Other special and complex environments. Such as by the sea, where the ambient air has a high moisture content and contains salt. By adopting the technical solution of this application, it is energy-saving and avoids the contact between the material and the ambient air.

[0050] It can be seen from the above technical solutions that the embodiments of this invention application have the following advantages:

[0051] 1. In the drying oven, by closing the oven door, a relatively airtight environment is formed to isolate the external wet air, so that it is not affected by the humidity and cleanliness of the surrounding ambient air during operation;

[0052] 2. By using the drying oven of this application, the effect of a 40 kW heater can be obtained with 10 kW of electric energy. At the same time, the 30 kW of refrigerating capacity generated by the evaporator is used as a trapping pump to trap water vapor, so that relatively dry air is used to blow over the wet material instead of the humid ambient air, realizing high efficiency and energy saving, and having higher energy efficiency than electric heating;

[0053] 3. Using the evaporator of the refrigeration system as a trapping pump to extract water vapor, reducing the moisture content in the air around the material, which is conducive to the evaporation of moisture in the material and achieving the purpose of drying the material.

[0054] 4. By setting a one-way valve on the drain pipe of the drain tank, it is only used to drain the condensed water and prevent external air from entering the drying oven.

[0055] It solves the technical problems to be improved that in the current conventional electric heating method, there are energy losses and low conversion rates during the electric energy conversion process, and the conventional scheme sucks in ambient air, resulting in low drying efficiency and inability to be applied to other specific environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic structural diagram of this invention application;

[0057] Figure 2Schematic diagram of the embodiment of the present invention application.

[0058] Reference numerals:

[0059] Cabinet 1; Heating device 2; Inner cabinet partition 3; Circulation fan 4; Drainage trough 5; Cabinet door 6; Exhaust passage 7; Material 8; Condenser 9; Compressor 10; Expansion valve 11; Evaporator 12. Detailed implementation manners

[0060] The embodiment of the present invention application provides a drying oven, which solves the technical problems to be improved that in the current conventional electric heating method, there are energy losses and low conversion rates during the conversion of electric energy, and the drying efficiency is not high due to the inhalation of ambient air in the conventional solution, and it cannot be applied to other specific environments.

[0061] In order to make the invention purpose, features and advantages of the embodiment of the present invention application more obvious and understandable, the technical solutions in the embodiment of the present invention application will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention application. Obviously, the embodiments described below are only part of the embodiments of the present invention application, rather than all the embodiments. Based on the embodiments in the embodiment of the present invention application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the embodiment of the present invention application.

[0062] Please refer to Figure 1 - Figure 2 , A drying oven, comprising a cabinet 1, a heating device 2, an inner cabinet partition 3, a circulation fan 4, and a drainage trough 5; the cabinet 1 is provided with a cabinet door 6 and a drainage trough 5; the cabinet door 6 is hinged to the cabinet 1; the inner cabinet partition 3 is arranged inside the cabinet 1, and the inner cabinet partition 3 divides the internal space of the cabinet 1 into a material evaporation area and a water vapor extraction area; the material evaporation area is used for the placement and drying of the material 8; the water vapor extraction area is used for the extraction and discharge of water vapor, and at least a pair of exhaust passages 7 are symmetrically arranged on the inner cabinet partition 3 for the circulating flow of gas between the material evaporation area and the water vapor extraction area; the heating device 2 is arranged in the material evaporation area; the circulation fan 4 is arranged in the material evaporation area and / or the water vapor extraction area; the drainage trough 5 is arranged at the bottom of the cabinet 1 in the water vapor extraction area.

[0063] Preferably, the inner cabinet partition 3 can be horizontally or vertically arranged inside the cabinet 1.

[0064] Preferably, the inner cabinet partition 3 is detachably fixed to the inner wall of the cabinet 1.

[0065] In a further preferred embodiment, the inner partition 3 can be adjusted according to the size of the material 8 by adjusting the installation position of the inner partition 3 on the inner wall of the box body 1 to adjust the size ratio of the material evaporation zone space to the water vapor extraction zone space.

[0066] Preferably, the heating device 2 is a condenser 9 .

[0067] In a further preferred embodiment, the drying box further comprises a compressor 10, an expansion valve 11, and an evaporator 12; the compressor 10 is connected in series with the condenser 9, the expansion valve 11, and the evaporator 12 through a pipeline to form a closed loop; the compressor 10 and the expansion valve 11 are arranged outside the box 1, and the evaporator 12 is arranged in the water vapor extraction area. The condenser 9 is a sheet structure.

[0068] Preferably, the sheet-like structure is provided as one or more sheets.

[0069] In some specific embodiments, the condenser 9 can be made into a shape similar to a "radiator", and the wet material can be directly placed on the condenser 9 for heating and drying.

[0070] The heat exchange between the material and the condenser 9 achieves the effect of heat release by the refrigerant and heat absorption by the material. In this way, the material can be quickly dried in an environment where the inside is heated by the condenser 9 and the outside is blown.

[0071] The condenser 9 can be provided with multiple sheet structures as needed to increase the evaporation area.

[0072] In a further preferred embodiment, the exhaust channel 7 and the drainage groove 5 are also provided with a one-way valve for preventing the backflow of gas or liquid.

[0073] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention application, rather than to limit the same. Although the present invention application has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention application.

Claims

1. A drying oven, characterized in that: It includes a box body, a heating device, an internal partition of the box, a circulation fan, and a drainage trough; The box body is provided with a box door and a drainage trough; the box door is hinged to the box body; The internal partition of the box is arranged inside the box body, and the internal partition of the box divides the internal space of the box body into a material evaporation area and a water vapor extraction area; the material evaporation area is used for the placement and drying of materials; the water vapor extraction area is used for the extraction and discharge of water vapor; At least a pair of exhaust channels are symmetrically arranged on the internal partition of the box for the circular flow of gas between the material evaporation area and the water vapor extraction area; The heating device is arranged in the material evaporation area; The circulation fan is arranged in the material evaporation area and / or the water vapor extraction area; The drainage trough is arranged at the bottom of the box body in the water vapor extraction area.

2. The drying oven according to claim 1, wherein: The internal partition of the box can be horizontally or vertically arranged inside the box body.

3. The drying oven according to claim 2, wherein: The end of the internal partition of the box is detachably fixed to the inner wall of the box body.

4. The drying oven according to claim 3, characterized in that: The internal partition of the box can adjust the ratio of the space of the material evaporation area to the space of the water vapor extraction area by adjusting the installation position of the internal partition of the box on the inner wall of the box according to the size of the material.

5. The drying oven according to claim 1, characterized in that: The heating device is a condenser.

6. The drying oven according to claim 5, characterized in that: It further includes a compressor, an expansion valve, and an evaporator; the compressor is connected in series with the condenser, the expansion valve, and the evaporator through pipelines to form a closed loop; the compressor and the expansion valve are arranged outside the box body, and the evaporator is arranged in the water vapor extraction area.

7. The drying oven according to claim 6, characterized in that: The condenser is in a sheet structure.

8. The drying oven according to claim 7, characterized in that: The sheet structure is set to be one or more sheets.

9. The drying oven according to claims 1-8, characterized in that: The exhaust channel and the drainage trough are also provided with one-way valves to prevent the backflow of gas or liquid.

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