Double-pump vacuum precooler

Abstract

The utility model relates to a double-pump vacuum precooler, which is characterized in that a temperature sensor attached to a precooled object is arranged in a vacuum box body, a pick-and-place door is arranged on the vacuum box body, the upper end of the vacuum box body is connected with a main pipeline, a main pipeline electromagnetic valve is arranged on the main pipeline, and the main pipeline is divided into three paths, the second path is connected with the water ring vacuum pump through a first branch electromagnetic valve, the third path is connected with the oil seal vacuum pump through a second branch electromagnetic valve, a water catching surface air cooler is arranged in the vacuum box body, a compressor is arranged outside the vacuum box body, and the compressor is connected with the water catching surface air cooler through a condenser and an expansion valve and is connected back to the compressor. And the main path electromagnetic valve, the first branch electromagnetic valve, the second branch electromagnetic valve, the bypass electromagnetic valve and the temperature sensor are connected with a control box. The structure is simple, the precooling effect can be effectively considered, meanwhile, stable and controllable trapping of water vapor is ensured, and the use safety and stability of the whole machine are improved.

Description

Technical Field

[0001] This utility model relates to a precooling machine, specifically a dual-pump vacuum precooling machine. Background Technology

[0002] In the existing pre-cooling operations of flowers and food products, most vacuum pre-cooling machines use oil-sealed pumps with very low minimum vacuum levels. This results in a huge waste of power. At the same time, the minimum vacuum level causes a large amount of moisture to evaporate from the product. The large amount of water vapor discharged can easily exceed the adsorption capacity of the built-in surface cooler and water trap surface cooler and enter the oil-sealed pump, affecting the performance, safety and service life of the oil-sealed pump. Summary of the Invention

[0003] This invention provides a dual-pump vacuum precooler with a simple structure that effectively balances precooling effect with stable and controllable water vapor capture, thereby improving the safety and stability of the entire machine.

[0004] The technical solution adopted by this utility model is as follows: a dual-pump vacuum precooling machine, including a vacuum chamber, a temperature sensor that fits the precooled object inside the vacuum chamber, a loading and unloading door on the vacuum chamber, and a water ring vacuum pump connected to the upper end of the vacuum chamber. The key feature is that a main pipeline is connected to the upper end of the vacuum chamber, a main solenoid valve is installed on the main pipeline, and the main pipeline is divided into three paths: the first path connects to the outside via a bypass solenoid valve, the second path connects to the water ring vacuum pump via a first branch solenoid valve, and the third path connects to an oil-sealed vacuum pump via a second branch solenoid valve. A water-catching surface cooler is installed inside the vacuum chamber, and a compressor is installed outside the vacuum chamber. The compressor connects to the water-catching surface cooler via a condenser and an expansion valve, and then back to the compressor. The main solenoid valve, the first and second branch solenoid valves, the bypass solenoid valve, and the temperature sensor are connected to a control box.

[0005] The water-catching surface cooler is equipped with a water-receiving plate.

[0006] The vacuum chamber is provided with an upper partition in the middle, which separates the upper parts of both sides of the vacuum chamber. The two sides of the vacuum chamber below the upper partition are connected. The pre-cooled material is placed on one side of the vacuum chamber, and the water-catching surface cooler is placed on the other side of the vacuum chamber.

[0007] The water-catching surface cooler has a tube-fin structure.

[0008] Both sides of the vacuum chamber are equipped with loading and unloading doors.

[0009] A dryer is installed on the third line after the solenoid valve of the second branch line.

[0010] This invention combines a water ring vacuum pump and an oil-sealed vacuum pump. During precooling, at the normal precooling temperature, the main solenoid valve and the first branch solenoid valve are opened, allowing the water ring vacuum pump to reduce pressure and the water-capturing surface cooler to cool the material inside the vacuum chamber. At this time, water vapor evaporates under the low pressure of the normal precooling temperature and is discharged by the water ring vacuum pump, without affecting the water ring vacuum pump. When a lower precooling temperature is required, it can be done in stages. First, the water ring vacuum pump of the first branch lowers the temperature to the normal precooling temperature. Then, one branch of the water ring vacuum pump is closed, and the second branch solenoid valve is opened, allowing the oil-sealed vacuum pump to further reduce the pressure inside the vacuum chamber. At this time, some water vapor is initially discharged by the water ring vacuum pump, and the amount of water vapor between the normal precooling temperature and the set lower precooling temperature is relatively reduced, which is beneficial for the condensation and capture of the water-capturing surface cooler. On the basis of ensuring the precooling effect, a dryer is used to further prevent water vapor or excessive water vapor from entering the oil-sealed vacuum pump, which would affect the safety, performance and lifespan of use. The upper partition separates the pre-cooled material and the water-catching surface cooler inside the vacuum chamber, which can effectively improve the water-catching effect of the water-catching surface cooler when water vapor is extracted. After the pre-cooled material is pre-cooled, the bypass solenoid valve is turned on to restore the air pressure inside the vacuum chamber, and the pre-cooled material can be taken out by opening the access door. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the diagram: 1. Vacuum chamber; 2. Upper partition; 3. Pre-cooled material; 4. Temperature sensor; 5. Water trap surface cooler; 6. Compressor; 7. Condenser; 8. Expansion valve; 9. Control box; 10. Main pipeline; 11. Main pipeline solenoid valve; 12. Bypass solenoid valve; 13. First branch solenoid valve; 14. Water ring vacuum pump; 15. Second branch solenoid valve; 16. Dryer; 17. Oil-sealed vacuum pump. Detailed Implementation

[0013] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0014] Figure 1 As shown: A dual-pump vacuum precooler includes a vacuum chamber 1, an upper partition 2, a temperature sensor 4, a water-collecting surface cooler 5, a compressor 6, a condenser 7, an expansion valve 8, a control box 9, a main pipeline 10, a main pipeline solenoid valve 11, a bypass solenoid valve 12, a first branch solenoid valve 13, a water ring vacuum pump 14, a second branch solenoid valve 15, a dryer 16, and an oil-sealed vacuum pump 17.

[0015] An upper partition 2 is installed in the middle of the vacuum chamber 1, which separates the upper parts of both sides of the vacuum chamber 1. The lower part of the upper partition 2 connects the two sides of the vacuum chamber 1. The pre-cooled material 3 is placed on one side of the vacuum chamber 1, and the water-catching surface cooler 5 is placed on the other side of the vacuum chamber 1. A compressor 6 is installed outside the vacuum chamber 1. The compressor 6 is connected to the water-catching surface cooler 5 and back to the compressor 6 via a condenser 7 and an expansion valve 8. A main pipeline 10 is connected to the upper end of the vacuum chamber 1. A main pipeline solenoid valve 11 is installed on the main pipeline 10. The main pipeline 10 is divided into three branches. The first branch is connected to the outside via a bypass solenoid valve 12. The second branch is connected to the water ring vacuum pump 14 via a first branch solenoid valve 13. The third branch is connected to the oil-sealed vacuum pump 17 via a second branch solenoid valve 15 and a dryer 16. The main pipeline solenoid valve, the first and second branch solenoid valves, the bypass solenoid valve, and the temperature sensor are connected to the control box 9.

[0016] In this embodiment, a water collection tray is provided under the water-catching surface cooler to collect the captured water and condensate.

[0017] In this embodiment, the water-catching surface cooler has a tube-fin structure.

[0018] In this embodiment, both sides of the vacuum chamber are provided with loading and unloading doors.

Claims

1. A dual-pump vacuum precooling machine, comprising a vacuum chamber, a temperature sensor fitted to the precooled object being disposed inside the vacuum chamber, a loading / unloading door on the vacuum chamber, and a water ring vacuum pump connected to the upper end of the vacuum chamber, characterized in that: The upper end of the vacuum chamber is connected to a main pipeline, which is equipped with a main solenoid valve. The main pipeline is divided into three branches: the first branch is connected to the outside via a bypass solenoid valve, the second branch is connected to a water ring vacuum pump via a first branch solenoid valve, and the third branch is connected to an oil seal vacuum pump via a second branch solenoid valve. The vacuum chamber is equipped with a water trap surface cooler, and the vacuum chamber is equipped with a compressor. The compressor is connected to the water trap surface cooler via a condenser and an expansion valve, and then back to the compressor. The main solenoid valve, the first and second branch solenoid valves, the bypass solenoid valve, and the temperature sensor are connected to the control box.

2. The dual-pump vacuum precooler according to claim 1, characterized in that: The water-catching surface cooler is equipped with a water-receiving plate.

3. The dual-pump vacuum precooler according to claim 1, characterized in that: The vacuum chamber is provided with an upper partition in the middle, which separates the upper parts of both sides of the vacuum chamber. The two sides of the vacuum chamber below the upper partition are connected. The pre-cooled material is placed on one side of the vacuum chamber, and the water-catching surface cooler is placed on the other side of the vacuum chamber.

4. A dual-pump vacuum precooler according to claim 1, 2, or 3, characterized in that: The water-catching surface cooler has a tube-fin structure.

5. A dual-pump vacuum precooler according to claim 3, characterized in that: Both sides of the vacuum chamber are equipped with loading and unloading doors.

6. A dual-pump vacuum precooler according to claim 1, characterized in that: A dryer is installed on the third line after the solenoid valve of the second branch line.

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