JP3213237U - Vacuum drying equipment - Google Patents

Abstract

Disclosed is a vacuum drying apparatus which can prevent electric leakage and can improve drying efficiency. A vacuum drying apparatus 100 is connected to a gas supply apparatus 1, a dry pump 2 connected to the gas supply apparatus 1 through a first pipeline 10, and a dry pump 2 through a second pipeline 20. And the vacuum drying chamber 4 connected to the temperature control device 3 through the third pipeline 30. The parts to be dried are dried in the vacuum drying chamber 4 by a helium gas of 40 ° C. or higher which is circulated by opening and closing valves provided in each pipeline. [Selection] Figure 1

Description

  The present invention relates to a technical field of a drying apparatus for drying a product, and specifically relates to a technical field of a vacuum drying apparatus.

  As the configuration of many conventional vacuum drying apparatuses, the following are known. Patent Document 1 discloses a vacuum drying apparatus in which a resistance heater is provided in a vacuum drying chamber, and the components are heated and dried in the vacuum drying chamber by heat generated by energizing the resistance heater.

  Patent Document 2 discloses a vacuum drying apparatus that irradiates a component with infrared rays using an infrared heater in order to increase the temperature in the vacuum drying chamber.

Japanese Patent Application Laid-Open No. 2006-144841 JP-A-8-94246

  In the vacuum drying apparatus described in Patent Document 1, it is necessary to lower the voltage applied to the resistance heater, and a large current is required to obtain predetermined power. In the process of drying the component, the moisture on the surface of the component evaporates in the vacuum drying chamber as the heating time elapses. When the water vapor comes into contact with the resistance heater, electric leakage is likely to occur and there is a risk.

  In the vacuum drying apparatus described in Patent Document 2, the temperature of the portion where the infrared ray hits efficiently increases, but the temperature of the portion where the infrared ray hardly hits does not increase efficiently. Therefore, there is unevenness in the drying efficiency of each part of the part, and the drying efficiency of the whole part is poor. Even if the heater is attached to the outer wall of the vacuum drying chamber and heated by the radiant heat of the wall surface, the material of the vacuum drying chamber is usually made of ordinary steel or stainless steel. The internal temperature rise efficiency is poor, and the drying efficiency of the parts is poor.

  In view of the above circumstances, an object of the present invention is to provide a vacuum drying apparatus that can prevent electric leakage and can improve drying efficiency.

In order to achieve the above object, the vacuum drying apparatus of the present invention is:
A gas supply device;
A dry pump connected to the gas supply device via a first pipeline;
A first valve, provided in the first pipeline, and arranged sequentially in a direction from the gas supply device to the dry pump, a vacuum gauge and a flow rate adjustment valve;
A temperature control device connected to the dry pump via a second pipeline;
A second valve provided in the second pipeline;
A vacuum drying chamber connected to the temperature control device via a third pipeline;
A third valve provided in the third pipeline;
A fourth pipeline having one end connected between the first valve of the first pipeline and the vacuum gauge, and the other end connected to the vacuum drying chamber;
A fourth valve provided in the fourth pipeline;
A fifth pipeline having one end connected in front of the fourth valve of the fourth pipeline and the other end connected between the third valve of the third pipeline and the temperature control device. When,
A fifth valve provided in the fifth pipeline;
With
The vacuum drying chamber has a drying box in the chamber, an exhaust hole in the wall of the drying box,
The vacuum drying chamber is provided with a vacuum release valve,
The fourth pipeline communicates with the drying box inside the vacuum drying chamber;
An intermediate layer is provided on the outer wall of the vacuum drying chamber,
The dry pump is connected to the intermediate layer via a sixth pipeline;
A sixth valve is provided in the sixth pipeline;
It is characterized by that.

  The gas supplied into the gas supply device may be a helium gas at 40 ° C. or higher.

  A circulating water pipe and a thermometer may be provided inside the temperature control device.

  The vacuum drying chamber may be formed of an aluminum alloy material.

  An infrared heater may be provided inside the vacuum drying chamber.

  According to the present invention, electric leakage can be made difficult to occur, and drying efficiency can be improved.

1 is a schematic structural diagram of a vacuum drying apparatus according to an embodiment of the present invention.

  In order to clarify the technical problems, technical solutions and advantages of the present invention, the following detailed description will be given with reference to the drawings and specific examples.

  As shown in FIG. 1, a vacuum drying apparatus 100 according to an embodiment of the present invention includes a gas supply device 1, a dry pump 2, a temperature control device 3, a vacuum drying chamber 4, and a first pipeline 10. , Second pipeline 20, third pipeline 30, fourth pipeline 40, fifth pipeline 50, and sixth pipeline 70.

  The gas supply device 1 is a device that is supplied with helium gas and supplies the helium gas to the vacuum drying chamber 4. Helium gas is used because a gas with high thermal conductivity is desirable.

  The dry pump 2 is connected to the gas supply device 1 via the first pipeline 10.

  The temperature control device 3 is connected to the dry pump 2 via the second pipeline 20. A circulating water pipe 33 and a thermometer 34 are provided in the temperature control device 3.

  The vacuum drying chamber 4 is connected to the temperature control device 3 through the third pipeline 30. A vacuum release valve 42 is connected to the vacuum drying chamber 4. The vacuum drying chamber 4 is made of an aluminum alloy material.

  An infrared heater 8 is provided in the vacuum drying chamber 4. A drying box 7 is provided in the vacuum drying chamber 4. A plurality of holes 701 are provided in the wall of the drying box 7. By providing the plurality of holes 701, high temperature gas is uniformly sprayed on the part to be dried. An intermediate layer 9 is provided on the outer wall of the vacuum drying chamber 4.

  In the first pipeline 10, a first valve 11, a vacuum gauge 13, and a flow rate adjustment valve 12 are arranged in order in the direction from the gas supply device 1 to the dry pump 2.

  The second pipeline 20 is provided with a second valve 21.

  A third valve 31 is provided in the third pipeline 30.

  One end of the fourth pipeline 40 is connected between the first valve 11 and the vacuum gauge 13 in the first pipeline 10. The other end of the fourth pipeline 40 is connected to and communicates with the drying box 7 inside the vacuum drying chamber 4. A fourth valve 41 is provided in the fourth pipeline 40.

  One end of the fifth pipeline 50 is connected to the front of the fourth valve 41 in the fourth pipeline 40. The other end of the fifth pipeline 50 is connected between the third valve 31 and the temperature control device 3 in the third pipeline 30. The fifth pipeline 50 is provided with a fifth valve 51.

  A sixth valve 71 is provided in the sixth pipeline 70.

  The dry pump 2 is connected to the intermediate layer 9 via the sixth pipeline 70.

  The operation process of the vacuum drying apparatus 100 will be described below.

  (1-1) The first valve 11, the second valve 21, the third valve 31, and the fourth valve 41 are closed, and the sixth valve 71 and the fifth valve 51 are opened. In this state, the dry pump 2 is started and each pipeline is evacuated. This vacuum state when evacuated is a state of a space filled with a pressure lower than the normal atmospheric pressure.

  (1-2) After the vacuum gauge 13 reaches the ultimate pressure, that is, after evacuation is completed, the sixth valve 71 is closed and the second valve 21 is opened. As a result, the second pipeline 20, the third pipeline 30, the fifth pipeline 50, the fourth pipeline 40, and the first pipeline 10 form a first circulation line.

  Then, helium gas in the gas supply device 1 is sucked into the dry pump 2 in the first circulation line. While the pressure is measured by the vacuum gauge 13, the helium gas is simultaneously raised to a predetermined pressure P1 by the pressure in the first circulation line.

  Subsequently, the first valve 11 is closed, and the circulating water pipe 33 in the temperature control device 3 operates. At the same time, the flow rate adjusting valve 12 is adjusted, the temperature of the helium gas in the first circulation line is adjusted, and the thermometer 34 observes the result in real time.

  (2-1) After the temperature of the helium gas in the first circulation line is adjusted to a predetermined temperature, the product to be dried is put into the vacuum drying chamber 4. Thereafter, the vacuum release valve 42 is closed, the sixth valve 71 and the fourth valve 41 are opened, the second valve 21 and the fifth valve 51 are closed, and the vacuum drying chamber 4 is evacuated.

  (2-2) After the vacuum gauge 43 reaches a predetermined pressure, the second valve 21 and the third valve 31 are opened, the sixth valve 71 is closed, the second pipeline 20, the third pipeline 30, A second circulation line is formed by the vacuum drying chamber 4, the fourth pipeline 40, and the first pipeline 10.

  The vacuum drying chamber 4 is filled with helium gas, and the gas is compressed and heated by the dry pump 2 and circulated. The helium gas is set to a high temperature of 40 ° C. or higher. Then, helium gas enters the vacuum drying chamber 4 through the third valve 31 on the third pipeline 30, and then gradually fills the entire drying box 7 through the plurality of holes 701. Furthermore, it is discharged from the fourth pipeline 40 communicating with the drying box 7 and circulated in a specific direction to improve the drying efficiency, and the helium gas prevents the turbulent flow from occurring in the vacuum drying chamber 4. By providing the infrared heater 8, the accuracy of the gas temperature in the vacuum drying chamber 4 can be ensured, and the drying efficiency is improved.

  (2-3) After the vacuum gauge 13 has risen to the predetermined pressure P2, the sixth valve 71 is opened and the second valve 21 is closed to lower the pressure to the predetermined pressure P1. After the drying program is finished, the second valve 21 and the third valve 31 are closed, the sixth valve 71 is opened, and the gas in the vacuum drying chamber 4 is passed by the dry pump 2 through the sixth pipeline 70 to the intermediate layer 9. The vacuum drying chamber 4 is kept warm and heated by the residual temperature of the gas, and the exhaust gas is fully utilized, resulting in energy saving and environmentally friendly effects.

  (3) After the parts have been dried for a predetermined time, the sixth valve 71 and the fourth valve 41 are closed, the fifth valve 51 is opened, the vacuum release valve 42 is opened, and the vacuum drying chamber 4 is at atmospheric pressure. A state is reached and the part is removed.

  (4) The gas is circulated through the path from the second pipeline 20, the third pipeline 30, and the fifth pipeline 50 back to the first pipeline 10, thereby maintaining the gas temperature and performing the next drying. .

  According to the configuration of the present embodiment, the components are dried in the vacuum drying chamber 4 by helium gas having a high temperature and high thermal conductivity. Since a resistance heater is not used, a leakage phenomenon caused by water vapor generated during vacuum drying is suppressed, and safety is improved. Since helium gas is a gas, the parts are uniformly wrapped at a constant pressure, and drying unevenness hardly occurs in each part of the parts, thereby improving the drying efficiency.

  Further, the high-temperature gas heated by the compression heat of the gas in the exhaust process of the dry pump 2 is circulated under reduced pressure using the dry pump 2 to keep the vacuum drying chamber 4 warm. Therefore, the heat use efficiency is improved, and a gas heating mechanism is not required. As a result, the vacuum drying apparatus 100 of the present embodiment has high safety (does not adversely affect the environment), high reliability, and energy saving.

  Furthermore, since a plurality of holes 701 are provided in the drying box 7 inside the vacuum drying chamber 4, the high-temperature gas is uniformly blown onto the parts, so that the drying efficiency is improved and energy is saved.

(Modification)
In this embodiment, helium gas is used, but the present invention is not limited to this gas. Any gas having higher thermal conductivity than air may be used in the vacuum drying apparatus 100 of the present embodiment.

  The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention. Should also be regarded as the scope of protection of the present invention.

DESCRIPTION OF SYMBOLS 1 Gas supply apparatus 2 Dry pump 3 Temperature control apparatus 4 Vacuum drying chamber 7 Drying box 10 1st pipeline 11 1st valve 12 Flow control valve 13 Vacuum gauge 20 2nd pipeline 21 2nd valve 30 3rd pipeline 31 1st Three valves 33 Circulating water pipe 34 Thermometer 40 Fourth pipeline 41 Fourth valve 42 Vacuum release valve 43 Vacuum gauge 50 Fifth pipeline 51 Fifth valve 70 Sixth pipeline 71 Sixth valve 100 Vacuum dryer 701 Hole 8 Infrared Heater 9 Middle layer P1 Pressure P2 Pressure

Claims (5)

A gas supply device;
A dry pump connected to the gas supply device via a first pipeline;
A first valve, provided in the first pipeline, and arranged sequentially in a direction from the gas supply device to the dry pump, a vacuum gauge and a flow rate adjustment valve;
A temperature control device connected to the dry pump via a second pipeline;
A second valve provided in the second pipeline;
A vacuum drying chamber connected to the temperature control device via a third pipeline;
A third valve provided in the third pipeline;
A fourth pipeline having one end connected between the first valve of the first pipeline and the vacuum gauge, and the other end connected to the vacuum drying chamber;
A fourth valve provided in the fourth pipeline;
A fifth pipeline having one end connected in front of the fourth valve of the fourth pipeline and the other end connected between the third valve of the third pipeline and the temperature control device. When,
A fifth valve provided in the fifth pipeline;
With
The vacuum drying chamber has a drying box in the chamber, an exhaust hole in the wall of the drying box,
The vacuum drying chamber is provided with a vacuum release valve,
The fourth pipeline communicates with the drying box inside the vacuum drying chamber;
An intermediate layer is provided on the outer wall of the vacuum drying chamber,
The dry pump is connected to the intermediate layer via a sixth pipeline;
A sixth valve is provided in the sixth pipeline;
A vacuum drying apparatus characterized by that. The gas supplied into the gas supply device is helium gas of 40 ° C. or higher.
The vacuum drying apparatus according to claim 1. A circulating water pipe and a thermometer are provided inside the temperature control device,
The vacuum drying apparatus according to claim 1 or 2. The vacuum drying chamber is formed of an aluminum alloy material;
The vacuum drying apparatus according to any one of claims 1 to 3. An infrared heater was provided inside the vacuum drying chamber,
The vacuum drying apparatus according to claim 1, wherein the apparatus is a vacuum drying apparatus.

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