Improved forced air drying cabinet

Abstract

The utility model discloses an improved blast drying oven belongs to valve sealing technical field. The improved blast drying oven includes heat preservation layer, inner box, oil chamber, liquid oil layer and heater, and the heat preservation layer inner wall is connected with the inner box outside for placing sample, and the oil chamber sets up at the heat preservation layer and inner box junction, and the oil cavity is provided with liquid oil layer, and the heater is installed in the oil chamber, and the heater is used for the heating of liquid oil layer in heater and the subsequent heating of inner box to constant temperature, and the inner box of blast drying oven and heat preservation layer increase a sealed oil chamber in the middle, and the oil chamber is filled with liquid oil layer, and the heater is used for the heating of liquid oil layer to heat the inner box to constant temperature, and the situation that the inner box can also be heated to constant temperature without air flow is solved, and the test condition of small particle or powder layer article is created, and the heating mode of liquid oil layer is adopted by the heater, and due to the change of heating mode, it is unnecessary to install motor, fan and other accessories, and the situation that the connecting hole leaks high-temperature gas is avoided.

Description

Technical Field

[0001] This utility model relates to the field of valve sealing technology, and in particular to an improved blower drying oven with windless oil bath constant temperature. Background Technology

[0002] Traditional blower drying ovens use a heater to heat the air, and then the heated air is circulated by a fan to achieve temperature rise and maintain a constant temperature.

[0003] Traditional forced-air drying ovens have some drawbacks. Due to the airflow inside, they cannot test small particles or powdery substances, and they can cause increased surface evaporation of liquid test samples. In addition, high-temperature gas can leak from the connection hole between the motor and the fan, and the fan operation generates continuous noise pollution. Utility Model Content

[0004] This application provides an improved forced-air drying oven suitable for testing fine particles, powdery substances, and liquid test samples. It solves the problems in the prior art where the forced-air drying oven cannot test fine particles and powdery substances due to airflow inside, and it leads to increased surface evaporation of liquid test samples. In addition, the connection hole between the motor and the fan in the forced-air drying oven will leak high-temperature gas, and the operation of the fan will generate continuous noise pollution.

[0005] This application provides an improved forced-air drying oven, including a heat insulation layer, the inner wall of which is connected to the outer side of an inner box for placing samples;

[0006] An oil chamber is located at the connection between the insulation layer and the inner box, and a liquid oil layer is provided inside the oil chamber;

[0007] A heater is installed in the oil chamber and is used to heat the liquid oil layer inside the heater and subsequently raise the temperature of the inner chamber to a constant temperature.

[0008] In some designs, the insulation layer and the front of the inner box are fitted with a door for sealing, and the door is equipped with air inlet and outlet louvers, and the door is sealed with high-temperature resistant silicone strips around its perimeter.

[0009] In some designs, the oil chamber is a fully sealed structure.

[0010] In some embodiments, the liquid oil layer is one of silicone heat transfer oil, mineral oil, or synthetic heat transfer oil.

[0011] In some designs, the heater has a U-shaped cross-section.

[0012] In some designs, the insulation layer is made of ceramic fiber.

[0013] In some embodiments, the heater is connected to an external temperature control device, which includes a temperature sensor for temperature detection and a controller for controlling the heater to operate at a constant temperature.

[0014] In some designs, the oil chamber has a U-shaped cross-section.

[0015] In some embodiments, the heaters are configured as a plurality of heaters, which are evenly distributed within the oil chamber.

[0016] In some designs, the connection between the oil chamber and the inner casing is achieved by laser welding to create a fully sealed connection.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0018] 1. A sealed oil chamber is added between the inner chamber and the insulation layer of the forced-air drying oven. The oil chamber is filled with a liquid oil layer. The liquid oil layer is heated by a heater to raise the temperature of the inner chamber to a constant temperature, thus solving the problem of raising the temperature to a constant temperature even when there is no air flow in the inner chamber.

[0019] 2. It created testing conditions for small particles or powdery materials, solving the problem of increased surface evaporation of liquid test samples;

[0020] 3. The method of heating the liquid oil layer with a heater eliminates the need for motors, fans, and other accessories due to the change in heating mode. This prevents the leakage of high-temperature gas from the connection holes and reduces the operating noise of motors and fans. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the improved blower drying oven in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of a publicly available blower drying oven. Detailed Implementation

[0023] This application provides an improved forced-air drying oven suitable for testing fine particles, powdery substances, and liquid test samples. It solves the problems in the prior art where the forced-air drying oven cannot test fine particles and powdery substances due to airflow inside, and it leads to increased surface evaporation of liquid test samples. In addition, the connection hole between the motor and the fan in the forced-air drying oven will leak high-temperature gas, and the operation of the fan will generate continuous noise pollution.

[0024] Specifically, such as Figure 1-2As shown, this application provides an improved forced-air drying oven, including an insulation layer 1, an inner chamber 5, an oil chamber 11, a liquid oil layer 2, and a heater 4. The inner wall of the insulation layer 1 is connected to the outer side of the inner chamber 5, which is used to place samples. The oil chamber 11 is located at the connection between the insulation layer 1 and the inner chamber 5, and a liquid oil layer 2 is disposed in the oil chamber. The heater 4 is installed in the oil chamber 11. The heater 4 is used to heat the liquid oil layer 2 in the heater 4 and subsequently raise the temperature of the inner chamber 5 to a constant temperature. A sealed oil chamber 11 is added between the inner chamber 5 and the insulation layer 1 of the forced-air drying oven. The oil chamber 11 is filled with a liquid oil layer 2. The liquid oil layer 2 is heated by the heater 4 to raise the temperature of the inner chamber 5 to a constant temperature. This solves the problem of raising the temperature to a constant temperature even when there is no air flow in the inner chamber 5, creating testing conditions for small particles or powdery items. It also solves the problem of increased surface evaporation of liquid test samples. The heating method of the liquid oil layer 2 by the heater 4 eliminates the need to install accessories such as motors and fans due to the change in heating mode, thus preventing the leakage of high-temperature gas from the connection holes and reducing the operating noise of motor and fan equipment.

[0025] In the process of filling the oil chamber 11, the chamber is first cleaned and dried before filling. Specifically, the inner wall of the oil bath chamber is cleaned with acetone or alcohol to remove residual metal shavings and oil stains. Then, it is purged with dry nitrogen (dew point ≤ -40℃) to ensure that there is no moisture residue. Then, the vacuum is evacuated to ≤10Pa (maintained for 30 minutes) and the vacuum degree is checked to see if it is stable. Then, laser welding is used to achieve a fully sealed connection between the oil chamber 11 and the inner box 5. Finally, the vacuum gradient filling method is used to fill the oil chamber 11.

[0026] Specifically, the vacuum gradient perfusion method includes the following steps:

[0027] (1) Pre-evacuate to 10Pa (maintain for 1 hour);

[0028] (2) Heat the silicone oil to 60°C (the viscosity drops to 25 cSt);

[0029] (3) Inject oil at a rate of 0.8 L / min through the bottom injection valve;

[0030] (4) The liquid level is controlled at 50mm from the top (leaving 5% expansion space).

[0031] Specifically, the insulation layer 1 and the front of the inner box 5 are equipped with a door 3 for sealing, and the door 3 is equipped with air inlet and outlet louvers. The door 3 is sealed with high-temperature resistant silicone strips.

[0032] In some embodiments, the oil chamber 11 is a fully sealed structure to prevent oil leakage.

[0033] In some embodiments, the liquid oil layer 2 is one of silicone heat transfer oil, mineral oil, or synthetic heat transfer oil.

[0034] Preferably, the heater 4 has a U-shaped cross-section and is adapted to the oil chamber 11 to ensure that the liquid oil layer 2 is evenly covered on the surface of the heater 4 and is fully heated by the heater 4.

[0035] In this embodiment, the insulation layer 1 is made of ceramic fiber.

[0036] Furthermore, the heater 4 is connected to an external temperature control device, which includes a temperature sensor for temperature detection and a controller for controlling the heater 4 to operate at a constant temperature.

[0037] In this embodiment, the oil chamber 11 has a U-shaped cross-section, which allows the oil chamber 11 to cover the three sides of the inner box 5 as much as possible, ensuring that the inner box 5 can be better heated to a constant temperature and is convenient to use.

[0038] Preferably, there are multiple heaters 4, which are evenly distributed within the oil chamber 11.

[0039] Specifically, the connection between the oil chamber 11 and the inner box 5 is achieved by laser welding to achieve a fully sealed connection.

[0040] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An improved forced-air drying oven, characterized in that, include: An insulation layer, the inner wall of which is connected to the outer side of an inner box for placing samples; An oil chamber is located at the connection between the insulation layer and the inner box, and a liquid oil layer is provided inside the oil chamber; A heater is installed in the oil chamber and is used to heat the liquid oil layer inside the heater and subsequently raise the temperature of the inner chamber to a constant temperature.

2. The improved forced-air drying oven according to claim 1, characterized in that, The insulation layer and the front of the inner box are equipped with a door for sealing, and the door is equipped with air inlet and outlet louvers. The door is sealed with high-temperature resistant silicone strips around its perimeter.

3. The improved forced-air drying oven according to claim 1, characterized in that, The oil chamber is a fully sealed structure.

4. The improved forced-air drying oven according to claim 1, characterized in that, The liquid oil layer is one of the following: organosilicon heat transfer oil, mineral oil, or synthetic heat transfer oil.

5. The improved forced-air drying oven according to claim 1, characterized in that, The heater has a U-shaped cross-section.

6. The improved forced-air drying oven according to claim 1, characterized in that, The insulation layer is made of ceramic fiber.

7. The improved forced-air drying oven according to claim 1, characterized in that, The heater is connected to an external temperature control device, which includes a temperature sensor for temperature detection and a controller for controlling the heater to operate at a constant temperature.

8. The improved forced-air drying oven according to claim 1, characterized in that, The cross-section of the oil chamber is U-shaped.

9. The improved forced-air drying oven according to claim 1, characterized in that, The heater is configured as a plurality of heaters, which are evenly distributed within the oil chamber.

10. The improved forced-air drying oven according to claim 1, characterized in that, The connection between the oil chamber and the inner box is achieved by laser welding to achieve a fully sealed connection.

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