METHOD AND DEVICE FOR RAPIDLY DRYING WARE SHELL AND WARE SHELL

• US 20120171462A1
• Filed: 10/30/2009
• Published: 07/05/2012
• Est. Priority Date: 09/15/2009
• Status: Abandoned Application

• Current Assignee: Yuchi Tsai
• Original Assignee: Yuchi Tsai
• Inventors: Tsai, Yuchi
• Application Number:
  US13/395,319
• Publication Number:
  US 20120171462A1
• Time in Patent Office: Days
• US Class Current: 428/304.4
• CPC Class Codes: B22C 9/12 Treating moulds or cores, e.g. drying, hardening
• CPC Class Codes: C04B 2235/606 Drying
• CPC Class Codes: C04B 33/30 Drying methods
• CPC Class Codes: F26B 2210/02 Ceramic articles or ceramic semi-finished articles
• CPC Class Codes: F26B 5/04 by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum F26B11/049 and F26B17/128 take precedence
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]

Abstract

A method and a device for rapidly drying ware shell, and a ware shell, are provided, in the field of precision casting technology. Conventionally, the ware shell drying process fails to ensure high quality of a ware shell and rapid drying simultaneously when the ware shell has a complex structure. The method includes the following steps: a. putting a ware shell to be dried in a sealed chamber; b. vacuuming the sealed chamber under the premise condition of controlling the ware shell in a constant temperature state, and cooling the gas in the sealed chamber in a predetermined time period to condense the moisture in the sealed chamber; c. vacuum injecting gas to the sealed vacuum chamber to make the chamber return to normal atmosphere pressure; d. determining whether the ware shell is dry. If result is YES, then end, otherwise back to step b.

Claims

1. A rapid drying method for ware shell is comprising the following steps:

a. putting a ware shell to be dried in a sealed chamber;

b. vacuuming the sealed chamber under the premise condition of controlling the ware shell in a constant temperature state, and cooling the gas in the sealed chamber in a predetermined time period to condense the moisture in the sealed chamber;

c. vacuum injecting gas to the sealed vacuum chamber to make the chamber return to normal atmosphere pressure;

d. determining whether the ware shell is dry; and

If the result is YES, then end, otherwise return to step b.

2. The method as described in claim 1, wherein when the surface layer of the ware shell is dried, the vacuum degree of the sealed chamber in step b is 650˜

550 mmHg.

3. The method as described in claim 1, wherein when the transition layer of the ware shell is dried, the vacuum degree of the sealed chamber in step b is 530˜

430 mmHg.

4. The method as described in claim 1, wherein when the supporting layer of the ware shell is dried, the vacuum degree of the sealed chamber in step b is 430˜

330 mmHg.

5. The method as described in claim 1, wherein when the sealing layer of the ware shell is dried, the vacuum degree of the sealed chamber in step b is 430˜

330 mmHg.

19. A ware shell prepared in accordance with the method described in claim 4, wherein the supporting layer of the ware shell is of loose spongy structure.

6. A rapidly drying device for a ware shell, comprising:

a sealed chamber, which is used for holding the ware shell to be dried, and comprises a chamber body equipped with a sealing door and an air inlet;

a heating device, which is used for controlling the ware shell under constant temperature;

a vacuum device, which is connected with the sealed chamber for vacuuming the sealed chamber; and

a cooling and condensing device, which is for cooling part of gas in the sealed chamber to condense the moisture in the sealed chamber.

7. The device as described in claim 6, wherein the cooling and condensing device comprises a compressor, a condenser, an evaporator, a low-pressure regulating valve and an expansion valve, wherein the compressor, the condenser, the low-pressure regulating valve and the expansion valve are all arranged outside the sealed chamber, while the evaporator is located inside, and wherein, the outlet of the compressor is connected with the inlet of the condenser;

the outlet of the condenser is connected with the inlet of the evaporator via the expansion valve; and

the outlet of the evaporator is connected with the inlet of the compressor via the low-pressure regulating valve.

8. The device as described in claim 7, wherein a gas-liquid separator is arranged between the compressor and the low-pressure regulating valve.

9. The device as described in claim 8, wherein an oil separator is arranged between the compressor and the condenser, and wherein, an oil outlet of the oil separator is connected to the compressor.

10. The device as described in claim 9, wherein a drying filter is arranged between the condenser and the expansion valve.

11. The device as described in claim 10, wherein a water cooler is arranged between the condenser and the drying filter.

12. The device as described in claim 10, wherein a high-pressure heat recovery tube of the compressor is also arranged inside the sealed chamber, and wherein, the outlet of the drying filter is also connected with one end of the high-pressure heat recovery tube of compressor;

and the other end of the high-pressure heat recovery tube of compressor is connected with the inlet of the expansion valve.

13. The device as described in claim 6, wherein the heating device comprises an electric heating tube, and is arranged in the sealed chamber.

14. The device as described in claim 7, wherein the sealed chamber is also arranged with a vertical spacer plate and a fan to form an air circulation loop in the sealed chamber, and wherein, one side of the vertical spacer plate is used for accommodating the ware shell, and the fan is arranged above the side of the vertical spacer;

and the other side of the vertical spacer plate is for accommodating the evaporator.

15. The device as described in claim 6, wherein a vacuum water tank is arranged on the bottom of the chamber body, and drain outlets are arranged on the bottom of the vacuum water tank.

16. The device as described in claim 6, wherein a sealing ring groove is arranged around the sealing door and an inflatable sealing ring is arranged in the sealing ring groove.

17. The device as described in claim 6, wherein a first filter screen and a second filter screen are arranged in proper order between the vacuum device and the chamber body.

18. The device as described in claim 6, wherein the air inlet of the chamber body is arranged with an external pressure equalizing solenoid valve and/or an external pressure equalizing manual ball valve.