阅读说明：本技术 一种用于珠宝首饰的真空烘干装置及方法 (Vacuum drying device and method for jewelry ) 是由 赵锐 于 2020-07-17 设计创作，主要内容包括：本发明公开一种用于珠宝首饰的真空烘干装置及方法,真空烘干装置包括箱体,箱体的内部设置有容纳部,容纳部的一侧转动连接有门结构,容纳部的内部设置有用于放置珠宝首饰的内胆和用于烘干珠宝首饰内水分的加热部,内胆通过第一管体连接真空泵,加热部和真空泵分别连接电控装置。真空烘干方法包括选择真空烘干装置；根据内胆内待烘干的珠宝首饰的含水量,确定电控装置设定真空烘干装置的烘干时长；开启真空泵将内胆内的空气抽出,使得内胆处于负压状态后真空泵停止工作,而后内胆的内部进行泄压,烘干时长内间隔循环执行多次抽真空步骤；利用加热部烘干内胆内待烘干的珠宝首饰的水分。本发明能够提高干燥效率,降低能耗,且自动化程度高。(The invention discloses a vacuum drying device and a method for jewelry, wherein the vacuum drying device comprises a box body, a containing part is arranged in the box body, one side of the containing part is rotatably connected with a door structure, an inner container for placing the jewelry and a heating part for drying moisture in the jewelry are arranged in the containing part, the inner container is connected with a vacuum pump through a first pipe body, and the heating part and the vacuum pump are respectively connected with an electric control device. The vacuum drying method comprises selecting a vacuum drying device; determining the drying time of the vacuum drying device set by the electric control device according to the water content of the jewelry to be dried in the inner container; starting a vacuum pump to pump out air in the inner container, stopping the vacuum pump after the inner container is in a negative pressure state, relieving pressure in the inner container, and circularly performing multiple vacuumizing steps at intervals during drying; and drying the moisture of the jewelry to be dried in the inner container by using the heating part. The invention can improve the drying efficiency, reduce the energy consumption and has high automation degree.)

1. The utility model provides a vacuum drying device for jewelry, a serial communication port, includes box (1), the inside of box (1) is provided with accommodating part (2), one side of accommodating part (2) is rotated and is connected with door structure (3), the inside of accommodating part (2) is provided with inner bag (4) that are used for placing jewelry and is used for drying heating portion (5) of moisture in the jewelry, inner bag (4) are through first body (6) connection vacuum pump (7), heating portion (5) with electric control unit (8) are connected respectively in vacuum pump (7).

2. Vacuum drying device for jewellery items according to claim 1, characterized in that the number of said housings (2) is one or more.

3. Vacuum drying device for jewellery items according to claim 2, characterised in that when the number of said housings (2) is multiple, said vacuum pump (7) is connected to said plurality of internal containers (4) through a second tube (9).

4. Vacuum drying device for jewellery items according to claim 3, characterized in that the junction of the second tube (9) with the first tube (6) is provided with a control valve (10).

5. Vacuum drying device for jewellery items according to claim 1, characterized in that said housing (2) is arranged at the upper part of said box (1) and said vacuum pump (7) is arranged at the lower part of said box (1).

6. Vacuum drying device for jewellery items according to claim 1, characterised in that the number of vacuum pumps (7) is one or more.

7. The vacuum drying device for jewelry items according to claim 1, wherein said heating part (5) is provided on at least one side outer wall of said inner container (4).

8. Vacuum drying device for jewelry items according to claim 1, characterized in that the heating part (5) is provided as an electrical heating plate.

9. The vacuum drying device for jewelry and other items of claim 8, wherein the electric heating plate is provided with a temperature control probe for detecting the heating temperature, and both the electric heating plate and the temperature control probe are connected to a temperature controller (11).

10. The vacuum drying device for jewelry and other items according to claim 1, wherein the outer wall of the inner container (4) is connected with the truss of the accommodating part (2) through a connecting part, so that the inner container (4) is arranged in the accommodating part (2) in a suspended manner.

11. The vacuum drying device for jewelry items according to claim 1, wherein a partition (12) is provided inside the inner container (4), the partition (12) dividing the inside of the inner container (4) into a plurality of regions, each region for holding jewelry items.

12. Vacuum drying device for jewellery items according to claim 1, characterized in that a dwell seal (13) is provided at a position between the opening (42) of the inner container (4) and the inside of the door structure (3).

13. The vacuum drying device for jewelry and other items of claim 12, wherein said pressure maintaining sealing member (13) is configured as a shaped silica gel sealing ring, said shaped silica gel sealing ring is sleeved on and covers the edge position of said opening portion (42).

14. Vacuum drying device for jewellery items according to claim 1, characterized in that the door structure (3) is connected to the receptacle (2) by means of a hinge (14).

15. Vacuum drying device for jewellery items according to claim 1, characterized in that the electric control device (8) is provided as a programmable logic controller.

16. Vacuum drying device for jewellery items according to claim 4, characterized in that said first tubular body (6) is provided with an air intake valve (61).

17. Vacuum drying apparatus for jewellery items according to claim 16, characterized in that a pressure sensor (62) is provided on the first tube (6) in a position between the control valve (10) and the admission valve (61) for detecting the pressure value inside the internal bladder (4).

18. A vacuum drying method for jewelry, which is characterized by comprising the following steps:

a vacuum drying device determining step: selecting a vacuum drying apparatus according to any one of claims 1 to 17;

vacuum drying parameter setting step: determining the drying time of the vacuum drying device set by the electric control device (8) according to the water content of the jewelry to be dried in the inner container (4);

Intermittent vacuum pumping: starting the vacuum pump (7) to pump out air in the inner container (4), stopping the vacuum pump (7) after the inner container (4) is in a negative pressure state, then decompressing the inner container (4), and circularly executing the vacuumizing step for multiple times at intervals during the drying time;

vacuum heating and drying: and drying the moisture of the jewelry to be dried in the inner container (4) by using the heating part (5).

19. The vacuum drying method for jewelry items according to claim 18, wherein the moisture content of the jewelry items to be dried in the inner container (4) is determined according to the style and/or the amount of the jewelry items to be dried in the inner container (4).

20. The vacuum drying method for jewelry items according to claim 19, wherein when the number of said internal containers (4) is plural, the drying time period of each of said internal containers (4) in said vacuum drying device is determined according to the water content of said jewelry item to be dried in each of said internal containers (4).

21. The vacuum drying method for jewelry items according to claim 18, wherein said evacuating step is performed when the pressure inside said inner container (4) is equal to or higher than said negative pressure maximum value during said drying period.

22. The vacuum drying method for jewelry items according to claim 21, wherein when said pressure sensor (62) detects that the pressure inside said inner container (4) is greater than or equal to said maximum negative pressure value, said control valve (10) is opened to perform said evacuating step; and when the pressure sensor (62) detects that the pressure in the inner container (4) is in the negative pressure state, closing the control valve (10).

23. The vacuum drying method for jewelry and other items according to claim 21, wherein the negative pressure value is set by the electric control device (8), and the negative pressure value is 3-60 kpa.

24. The vacuum drying method for jewelry items according to claim 18, wherein the drying rate of the jewelry items to be dried is adjusted according to the time length of the on time and the off time of the vacuum pump (7) when the evacuation step is performed cyclically at intervals within the drying time period.

25. The vacuum drying method for jewelry items according to claim 24, wherein the on-time and off-time of said vacuum pump (7) when said evacuation step interval is cyclically performed within said drying period is set by said electric control means (8).

26. The vacuum drying method for jewelry items of claim 24, wherein the rate of drying of the jewelry items to be dried is adjusted according to the number of times the vacuuming step is performed at intervals cyclically within the drying time period.

27. The vacuum drying method for jewelry items according to claim 26, wherein the number of times of intermittent cycles of said vacuuming step in said drying time period is set by said electric control means (8).

28. The vacuum drying method for jewelry and other items according to claim 18, wherein the temperature inside the inner container (4) is determined according to the heating temperature of the heating part (5), and the temperature inside the inner container (4) is 25-85 ℃.

29. The vacuum drying method for jewelry items according to claim 28, wherein a heating temperature of said heating part (5) is set by said electric control means (8).

30. The vacuum drying method for jewelry and other items according to claim 18, wherein after the jewelry and other items to be dried are dried, the air inlet valve (61) is opened to allow air to enter, so that the air pressure inside the inner container (4) is restored to a normal value, and then the door structure (3) is opened to take out the dried jewelry and other items.

31. The vacuum drying method for jewelry items according to claim 18, wherein the jewelry items to be dried comprise hollow and/or non-hollow items.

32. The vacuum drying method for jewelry items according to claim 31, wherein the moisture of the jewelry item to be dried comprises moisture located inside the hollow item; or the moisture of the jewelry to be dried comprises moisture inside and outside the hollow jewelry; and/or the external moisture of the non-hollow jewelry.

Technical Field

The invention relates to a vacuum drying device and method for jewelry, belonging to the technical field of jewelry processing.

Background

In the jewelry processing industry, continuous vacuum pumping technology is generally adopted for vacuum drying. The process comprises the following steps: and after the temperature in the vacuum drying equipment reaches a set value, putting the jewelry to be dried into the vacuum drying equipment, and closing the door of the vacuum drying equipment. And then, starting the vacuum pump, and closing the vacuum pump when the pumping time reaches the process required value. Then, the air inlet valve is manually opened, air is introduced into the vacuum drying equipment, the door is opened, and the dried jewelry is taken out. However, after the continuous vacuum-pumping process is continuously operated for a long time, the oil temperature of the vacuum pump is increased, so that the pumping rate of the vacuum pump is reduced, and the drying time is prolonged. In addition, the current vacuum drying equipment for jewelry has low automation degree, and cannot adjust the drying parameters (such as heating temperature) and/or drying time in real time according to the styles and the quantity of the jewelry.

Disclosure of Invention

In view of the above problems, the present invention provides a vacuum drying device for jewelry, which can improve the drying efficiency, reduce the energy consumption and has high automation degree.

In order to achieve the purpose, the invention provides a vacuum drying device for jewelry, which comprises a box body, wherein a containing part is arranged in the box body, one side of the containing part is rotatably connected with a door structure, an inner container for placing the jewelry and a heating part for drying moisture in the jewelry are arranged in the containing part, the inner container is connected with a vacuum pump through a first pipe body, and the heating part and the vacuum pump are respectively connected with an electric control device.

In a specific embodiment, the number of the receiving portions is one or more.

In one embodiment, when the number of the accommodating parts is multiple, the vacuum pump is connected with the inner containers through the second pipe body.

In one embodiment, a control valve is arranged at the joint of the second pipe body and the first pipe body.

In a specific embodiment, the receiving portion is disposed at an upper portion of the case, and the vacuum pump is disposed at a lower portion of the case.

In a specific embodiment, the number of the vacuum pumps is one or more.

In a specific embodiment, the heating part is arranged on at least one side of the outer wall of the inner container.

In a specific embodiment, the heating part is provided as an electric heating plate.

In a specific embodiment, a temperature control probe for detecting the heating temperature is arranged on the electric heating plate, and the electric heating plate and the temperature control probe are both connected with a temperature controller.

In a specific embodiment, the outer wall of the inner container is connected with the truss of the accommodating part through a connecting part, so that the inner container is arranged in the accommodating part in a suspended manner.

In a specific embodiment, a partition board is arranged inside the inner container, and divides the inner container into a plurality of areas, and each area is used for placing jewelry.

In one embodiment, a pressure maintaining seal is provided between the opening portion of the inner container and the inner side of the door structure.

In one embodiment, the pressure maintaining sealing element is a special-shaped silica gel sealing ring which is sleeved on and covers the edge position of the opening part.

In a particular embodiment, the door structure is connected to the receptacle by a hinge.

In a particular embodiment, the electrical control device is configured as a programmable logic controller.

In one embodiment, an air inlet valve is disposed on the first tube.

In a specific embodiment, a pressure sensor for detecting the pressure value in the inner container is arranged on the first pipe body at a position between the control valve and the air inlet valve.

The invention also provides a vacuum drying method for the jewelry, which comprises the following steps: a vacuum drying device determining step: selecting the vacuum drying device; vacuum drying parameter setting step: determining the drying time of the vacuum drying device set by the electric control device according to the water content of the jewelry to be dried in the inner container; intermittent vacuum pumping: starting the vacuum pump to pump out air in the inner container, stopping the vacuum pump after the inner container is in a negative pressure state, then decompressing the inner container, and circularly executing the vacuumizing step for multiple times at intervals during the drying time; vacuum heating and drying: and drying the moisture of the jewelry to be dried in the inner container by utilizing the heating part.

In a specific embodiment, the water content of the jewelry items to be dried in the liner is determined according to the style and/or the quantity of the jewelry items to be dried in the liner.

In a specific embodiment, when the number of the inner containers is multiple, the drying time of each inner container in the vacuum drying device is determined according to the water content of the jewelry to be dried in each inner container.

In a specific embodiment, the step of vacuumizing is performed when the pressure inside the inner container is greater than or equal to the maximum negative pressure value within the drying time period.

In a specific embodiment, when the pressure sensor detects that the pressure inside the liner is greater than or equal to the maximum negative pressure value, the control valve is opened to perform the vacuumizing step; and when the pressure sensor detects that the pressure in the inner container is in the negative pressure state, closing the control valve.

In a specific embodiment, the negative pressure value is set by means of the electronic control device.

In one embodiment, the negative pressure value is 3 to 60 kPa.

In a specific embodiment, the drying rate of the jewelry to be dried is adjusted according to the time length of the starting time and the stopping time of the vacuum pump when the vacuumizing step is executed at intervals in a circulating manner in the drying time period.

In a specific embodiment, the electronic control device is used for setting the starting time and the stopping time of the vacuum pump when the vacuumizing step is executed at intervals in a circulating manner in the drying time period.

In a specific embodiment, the drying rate of the jewelry to be dried is adjusted according to the number of times of interval and cyclic execution of the vacuumizing step in the drying time length.

In one embodiment, the number of times of the intermittent cyclic execution of the vacuum-pumping step in the drying time period is set by the electronic control device.

In a specific embodiment, the temperature in the inner container is determined according to the heating temperature of the heating part.

In a specific embodiment, the temperature in the inner container is 25-85 ℃.

In a specific embodiment, the heating temperature of the heating portion is set by the electric control device.

In a specific embodiment, after the jewelry to be dried is dried, the air inlet valve is opened to allow air to enter, so that the air pressure in the inner container is recovered to a normal air pressure value, then the door structure is opened, and the dried jewelry is taken out.

In a particular embodiment, the jewelry items to be dried comprise hollow jewelry items and/or non-hollow jewelry items.

In a particular embodiment, the moisture of the jewelry item to be dried comprises moisture located inside the hollow jewelry item; or the moisture of the jewelry to be dried comprises moisture inside and outside the hollow jewelry; and/or the external moisture of the non-hollow jewelry.

Due to the adoption of the technical scheme, the invention has the following advantages:

1. the vacuum drying device is provided with the liner, the heating part and the vacuum pump, and the heating part and the vacuum pump are respectively connected with the electric control device, so that the jewelry can be dried in vacuum, the drying efficiency is high, the energy consumption is low, and the automation degree is high.

2. The vacuum drying device is provided with the plurality of accommodating parts, so that the drying requirements of the jewelry in different time periods, batches, styles and quantities can be met.

3. The vacuum pump of the vacuum drying device is connected with the plurality of inner containers, so that a single vacuum pump can control the plurality of drying stations to work, different drying tasks can be processed conveniently, and the vacuum drying device is simple in structure, convenient to use and good in economical efficiency.

4. The control valve is arranged at the joint of the second tube body and the first tube body of the vacuum drying device, so that the vacuum pumping process of the inner containers can be flexibly controlled, and the vacuum pumping effect is good.

5. The heating part of the vacuum drying device is arranged into the electric heating plate, so that the temperature of the inner container can be accurately controlled within 85 ℃, meanwhile, the heating contact area between the electric heating plate and the inner container is large, the heating speed can be improved, and the energy consumption is low.

6. The electric heating plate of the vacuum drying device is provided with the temperature control probe, and the electric heating plate and the temperature control probe are both connected with the temperature controller, so that the heating state of the electric heating plate can be controlled simply, conveniently and efficiently, the flexibility is good, and the accuracy is high.

7. The inner container of the vacuum drying device is arranged in the accommodating part in a suspending way through the connecting part, so that the inner container can be heated uniformly, and the heat preservation performance is good.

8. The pressure maintaining sealing piece is arranged between the opening part of the inner container of the vacuum drying device and the inner side of the door structure, so that the sealing effect of the vacuum drying device can be improved, and the pressure maintaining failure time is long.

9. The door structure of the vacuum drying device is connected with the accommodating part through the hinge, can be adaptive and tightly attached according to the assembly deviation and the processing deviation of the liner, simultaneously, the heat of the liner cannot be transferred to the door structure, and the door structure is in contact with the vacuum cavity in the liner, is in a heat insulation state in a vacuum environment, and has a good heat insulation effect.

10. The electric control device of the vacuum drying device is set as a programmable logic controller, can simply, conveniently and efficiently realize the time sequence control and the vacuum pressure control of the drying process, and has the advantages of high automation degree, simple structure, convenient use and good economical efficiency.

11. The vacuum drying device is provided with the pressure sensor, can quickly and accurately detect the pressure value in the inner container, and is high in automation degree, simple in structure and convenient to use.

12. The vacuum drying method can circularly execute a plurality of intermittent vacuum pumping steps within the drying time, thereby improving the drying efficiency, reducing the energy consumption and having high automation degree.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the following briefly introduces the drawings required in the description of the embodiments:

FIG. 1 is a schematic perspective view of one embodiment of a vacuum drying apparatus for jewelry items according to the present invention;

FIG. 2 is a schematic perspective view of another embodiment of a vacuum drying apparatus for jewelry items according to the present invention;

FIG. 3 is a schematic perspective view of another embodiment of a vacuum drying apparatus for jewelry items according to the present invention;

FIG. 4 is a schematic structural view of one embodiment of the liner of the vacuum drying apparatus for jewelry items of the present invention;

FIG. 5 is a schematic structural view of one embodiment of a heating portion of the vacuum drying apparatus for jewelry of the present invention;

fig. 6 is a schematic structural view of one embodiment of the packing seal of the vacuum drying apparatus for jewelry.

Wherein, 1-a box body; 2-a housing; 3-door structure; 31-a handle; 4-inner container; 41-reinforcing ribs; 42-an opening; 5-heating part; 6-a first tube; 61-an air inlet valve; 62-a pressure sensor; 7-a vacuum pump; 8-an electric control device; 9-a second tube; 10-a control valve; 11-temperature controller; 12-a separator; 13-pressure maintaining sealing element; 14-a hinge; 15-roller.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.

As shown in figures 1-3, the vacuum drying device for jewelry comprises a box body 1, wherein a containing part 2 is arranged in the box body 1. One side of the accommodating part 2 is rotatably connected with a door structure 3, and the door structure 3 can be opened and closed at any time. The inner container 4 (shown in fig. 4) for holding the jewelry and the heating part 5 (shown in fig. 5) for drying the moisture in the jewelry are arranged in the accommodating part 2. The inner container 4 is connected to a vacuum pump 7 through a first pipe 6 (as shown in fig. 4), and is evacuated by the vacuum pump 7, so that the inside of the inner container 4 is in a low-pressure environment (negative pressure state), and evaporated water can be pumped away by the vacuum pump 7. The heating part 5 and the vacuum pump 7 are respectively connected with an electric control device 8, and the electric control device 8 can automatically set the drying time of the vacuum drying device. The vacuum drying device can be used for quickly drying non-hollow jewelry and/or hollow jewelry with small convection holes (the aperture is within 1 millimeter). During the use, this vacuum drying device can change the inside moisture of hollow jewelry into outside evaporation by inside evaporation to utilize the boiling point of water and ambient pressure positive correlation's principle (in low pressure environment, the boiling point of water reduces), can realize the inside moisture of hollow jewelry (or inside and outside) and/or the outside moisture rapid evaporation of non-hollow jewelry, thereby can improve drying efficiency, reduce the energy consumption, and degree of automation is high.

In a specific embodiment, the number of the receiving portions 2 is one or more. When the number of the accommodating parts 2 is multiple (as shown in fig. 1-3, namely, a plurality of drying stations are arranged in the box body 1), the drying requirements of the jewelry under the conditions of different time periods, multiple batches, different styles and different quantities can be met.

In a specific embodiment, as shown in fig. 3, when the number of the accommodating portions 2 is multiple, the vacuum pump 7 is connected to the plurality of inner containers 4 through the second pipe 9, so that the single vacuum pump 7 can control the plurality of drying stations to work, thereby facilitating handling of different drying tasks. Specifically, the second tube 9 is connected to the plurality of first tubes 6 of the plurality of inner containers 4.

In a specific embodiment, as shown in fig. 3, a control valve 10 is arranged at the joint of the second pipe 9 and the first pipe 6, and the control valve 10 is arranged in the box 1. The control valve 10 can flexibly control the vacuumizing process of the inner containers 4, and the vacuumizing effect is good.

In a preferred embodiment, the control valve 10 is a vacuum-operated ball valve, which allows to flexibly and accurately switch on or off the medium flow in the first tube 6 and the second tube 9. The control valve 10 is a rotary electric and electronic adjusting type valve driving device, and can realize the control of opening, closing or middle position of the valve by switching of an external power supply (controlled by a manual transposition switch or a computer) or external input signals.

In one embodiment, as shown in FIGS. 1 to 3, the receiving portion 2 is provided at an upper portion of the case 1. The vacuum pump 7 is arranged at the lower part of the box body 1, so that the layout is more reasonable and the use is convenient.

In a specific embodiment, as shown in fig. 2 and 3, the number of the vacuum pumps 7 is one or more. Specifically, in the stoving in-process, same vacuum pump 7 can carry out many times intermittent type work, and until the stoving end, can prevent to appear saturated steam pressure in the inner bag 4 (when the internal pressure value and the temperature value of inner bag 4 reached the setting value respectively, the moisture of jewelry can evaporate rapidly, supposes that vacuum pump 7 closes this moment, and the evaporation lasts until the saturation, leads to evaporation rate to reduce suddenly) to can improve drying efficiency. The duty ratio adjusting range of the vacuum pump 7 is large, and the drying speed can be adjusted by the starting and stopping time of the vacuum pump 7.

In a specific embodiment, as shown in fig. 5, the heating part 5 is provided on at least one side of the outer wall of the inner container 4.

In a specific embodiment, the heating part 5 is provided as an electric heating plate, which enables the temperature of the inner container 4 to be accurately controlled within 85 ℃. Meanwhile, the heating contact area of the electric heating plate and the inner container 4 is large, the heating speed can be improved, and the energy consumption is low.

In a specific embodiment, a temperature control probe for detecting the heating temperature is arranged on the electric heating plate, so that the temperature of the outer wall of the inner container 4 can be detected in real time. The electric heating plate and the temperature control probe are both connected with a temperature controller 11 (as shown in figure 3), and the temperature controller 11 is arranged inside the box body 1. The temperature controller 11 measures the temperature of the outer wall of the inner container 4 in real time through the temperature control probe, controls the electric heating plate to heat when the temperature value is smaller than a set value, and controls the electric heating plate to stop heating when the temperature value is larger than the set value.

In a preferred embodiment, the temperature setting of the thermostat 11 is 85 degrees celsius, which enables the internal temperature of the inner container 4 to be kept within 85 degrees celsius.

In a specific embodiment, the outer wall of the inner container 4 is connected with the truss of the accommodating part 2 through the connecting part, so that the inner container 4 is suspended in the accommodating part 2, the inner container 4 can be heated uniformly, and the heat preservation performance is good.

In a preferred embodiment, the outer wall of the inner container 4 is connected to the truss of the receptacle 2 by a bracket, so that the inner container 4 is suspended inside the receptacle 2. Wherein, the first end of support and the outer wall connection of inner bag 4, the second end and the truss connection of holding portion 2 of support.

In a specific embodiment, as shown in fig. 1 and 5, a partition plate 12 is arranged inside the inner container 4, and the inner container 4 is divided into a plurality of areas by the partition plate 12, and each area is used for placing jewelry. Specifically, the jewelry to be dried is placed on a metal tray with low friction coefficient and good heat conductivity, and then the tray is placed on the partition plate 12 and/or the bottom wall of the inner container 4.

In a specific embodiment, as shown in fig. 4, the outer wall of the inner container 4 is provided with a reinforcing rib 41, which can improve the strength and rigidity of the inner container 4 without increasing the wall thickness of the inner container 4.

In a specific embodiment, the pressure maintaining sealing member 13 (shown in fig. 1, 4 and 5) is disposed between the opening 42 (shown in fig. 4 and 5) of the inner container 4 and the inner side of the door structure 3, so as to improve the sealing effect of the vacuum drying apparatus.

In a specific embodiment, as shown in fig. 6, the packing 13 is provided as a profiled silica gel seal. The special-shaped silica gel sealing ring is sleeved on and covers the edge position of the opening part 42 (shown in figures 4 and 5), the sealing effect is good, and the pressure maintaining failure time is long. The pressure maintaining failure time of the special-shaped silica gel sealing ring is as long as 70 minutes.

In a specific embodiment, as shown in fig. 1, the door structure 3 is connected to the receiving portion 2 by a hinge 14, and can be adaptively and closely attached to the inner container 4 in response to assembling deviation and processing deviation. Meanwhile, the door structure 3 is connected with the accommodating part 2 through the hinge 14 (namely, the door structure 3 is not connected with the liner 4), so that the heat of the liner 4 can not be transferred to the door structure 3, and the door structure 3 is in a heat insulation state in a vacuum environment in contact with a vacuum cavity in the liner 4, and therefore, the heat insulation effect is good.

In a preferred embodiment, the door structure 3 is made of glass.

In a preferred embodiment, the door structure 3 is provided with a handle 31 on the outside to facilitate opening and/or closing of the door structure 3.

In a specific embodiment, the electric control device 8 is configured as a programmable logic controller, which can simply and efficiently realize the time sequence control and the vacuum pressure control of the drying process, and has high automation degree.

In a specific embodiment, as shown in fig. 1, the programmable logic controller is disposed on an outer wall of the case 1.

In a preferred embodiment, an alarm is arranged on the outer wall of the box body 1 and is connected with the programmable logic controller. When the drying time reaches a preset value, the programmable logic controller can trigger the alarm to send out an alarm prompt, and the safety is good.

In a specific embodiment, as shown in fig. 1 to 3, rollers 15 are respectively disposed at four corners of the bottom of the box 1, so as to facilitate moving the box 1.

In a particular embodiment, the first tubular body 6 is provided with an air inlet valve 61. When the drying time reaches a predetermined value, the intake valve 61 can be opened to perform the intake.

In a specific embodiment, a pressure sensor for detecting the pressure value in the inner container 4 is arranged at a position between the control valve 10 and the air inlet valve 61 on the first pipe body 6, so that the pressure value in the inner container can be detected quickly and accurately, the automation degree is high, the structure is simple, and the use is convenient.

The invention discloses a vacuum drying method for jewelry, which comprises the following steps:

(1) a vacuum drying device determining step: selecting a vacuum drying device for jewelry;

(2) vacuum drying parameter setting step: determining the drying time of the vacuum drying device set by the electric control device 8 according to the water content of the jewelry to be dried in the inner container 4;

(3) intermittent vacuum pumping: starting a vacuum pump 7 to pump out air in the liner 4, stopping the vacuum pump 7 after the liner 4 is in a negative pressure state, and then relieving pressure in the liner 4 (because the steam pressure in the closed vacuum environment is in a rapid rising stage at the beginning of drying, the evaporation rate can also reach a peak value in a short time, but the steam pressure can also rapidly tend to be saturated due to the limitation of the pressure and the temperature in the vacuum environment, and the steam pressure can also rapidly tend to be saturated, and the sudden drop of the evaporation rate follows, so that relatively high pressure can appear in the liner 4), and circularly executing multiple vacuumizing steps at intervals in the drying time of the vacuum drying device;

(4) Vacuum heating and drying: and drying the moisture of the jewelry to be dried in the inner container 4 by using the heating part 5.

In a specific embodiment, the water content of the jewelry to be dried in the liner 4 is determined according to the style and/or the quantity of the jewelry to be dried in the liner 4, so that the water content of the jewelry to be dried can be accurately determined, and further, the proper drying time can be matched according to the difference of the actual conditions of the style and/or the quantity of the jewelry to be dried.

In a specific embodiment, when the number of the inner containers 4 is multiple (multi-station vacuum drying device), the drying time of each inner container 4 in the vacuum drying device is determined according to the water content of the jewelry to be dried in each inner container 4, the automation degree is high, and the reliability is good.

In a specific embodiment, during the drying time, when the pressure inside the inner container 4 is greater than or equal to the maximum value of the negative pressure value, the vacuumizing step is performed.

In a specific embodiment, when the pressure sensor 62 detects that the pressure inside the inner container 4 is greater than or equal to the maximum negative pressure value, the control valve 10 is opened to perform the vacuum pumping step; when the pressure sensor detects that the pressure in the inner container 4 is in a negative pressure state, the control valve 10 is closed, the intermittent vacuumizing process can be controlled simply, rapidly and efficiently, and the accuracy and the reliability are high.

In a specific embodiment, the electric control device 8 is used for setting the negative pressure value of the inner container 4, so that the automation degree is high, and the reliability is good.

In a specific embodiment, the negative pressure value in the inner container 4 is 3-60 kpa (absolute vacuum pressure), which can effectively realize the accelerated flow of water molecules, and further can improve the drying efficiency. And, the lower the negative pressure value, the faster the evaporation rate.

In a specific embodiment, the drying rate of the jewelry to be dried is adjusted according to the starting time and the stopping time of the vacuum pump 7 when the vacuumizing step is executed at intervals within the drying time length, so that the drying rate reaches a target value. Specifically, in a vacuum drying environment, the evaporation of water may cause a saturated vapor pressure in the inner container 4, thereby causing a serious influence on the drying rate. According to the time length of the starting time and the stopping time of the vacuum pump 7 when the vacuumizing step is executed at intervals in the drying time, the saturated steam pressure in the inner container 4 can be prevented, the drying rate of the jewelry to be dried can be further improved, the drying efficiency is high, and the drying effect is good.

In a specific embodiment, the electric control device 8 is used for setting the starting time and the stopping time of the vacuum pump 7 when the vacuumizing step is executed at intervals in the drying time period, so that the automation degree is high, and the reliability is good.

In a specific embodiment, the drying rate of the jewelry to be dried is adjusted according to the number of times of the interval cycle execution of the vacuumizing step in the drying time length, so that the drying rate reaches a target value. And according to the times of the interval cycle execution of the vacuumizing step within the drying time, the saturated steam pressure in the inner container 4 can be further prevented, and further, the drying rate of the jewelry to be dried can be further improved.

In a specific embodiment, the electronic control device 8 is used for setting the times of the intermittent and cyclic execution of the vacuumizing step in the drying time, so that the automation degree is high, and the reliability is good.

In a specific embodiment, the temperature inside the inner container 4 is determined according to the heating temperature of the heating part 5, so that the temperature inside the inner container 4 can be maintained at a suitable drying temperature.

In a specific embodiment, the temperature in the inner container 4 is 25-85 ℃.

In a specific embodiment, the electric control device 8 is used for setting the heating temperature of the heating part 5, so that the heating effect is good, the automation degree is high, and the reliability is good.

In a specific embodiment, after the jewelry to be dried is dried, the air inlet valve 61 is opened to supply air, and then the door structure 3 is opened to take out the dried jewelry.

In a particular embodiment, the jewelry items to be dried include hollow items and/or non-hollow items.

In a specific embodiment, the moisture of the jewelry to be dried comprises moisture in the hollow jewelry, and the moisture in the hollow jewelry can be converted from internal evaporation to external evaporation, so that the drying efficiency can be improved, and the drying time can be shortened.

In a specific embodiment, the moisture of the jewelry to be dried comprises moisture in the inner part and the outer part of the hollow jewelry, so that the drying efficiency can be improved, and the drying time can be shortened.

In a particular embodiment, the moisture of the jewelry item to be dried comprises external moisture of non-hollow jewelry.

In a specific embodiment, the electric control device 8 is configured as a programmable logic controller, which can simply and efficiently realize the time sequence control and the vacuum pressure control of the drying process, and has high automation degree. Specifically, the programmable logic controller is used for presetting the drying time of the jewelry to be dried, the negative pressure value in the inner container 4, the vacuumizing time (starting time and stopping time) of the vacuum pump 7 and the heating temperature of the heating part 5; next, the control valve 10 is opened (as shown in fig. 2 and 3), vacuum pumping is started, and when the negative pressure value inside the inner container 4 reaches a preset value, the control valve 10 is closed. Then, the saturated steam pressure in the inner container 4 will slowly decrease, so that the internal pressure value of the inner container 4 gradually recovers, even exceeds the upper limit of the negative pressure value, and therefore continuous vacuum pumping (gap vacuum pumping) is required to improve the drying rate, and further, the moisture of the jewelry to be dried is efficiently and completely evaporated. Finally, when the drying time reaches a preset value, the air inlet valve 61 is opened to exhaust air, and the dried jewelry can be taken out after the door structure 3 is opened.

In a preferred embodiment, an alarm is arranged on the outer wall of the box body 1 and is connected with the programmable logic controller. When the drying time reaches a preset value, the programmable logic controller can trigger an alarm, so that an alarm prompt is sent out.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.