CN218915501U - Vacuum precooler - Google Patents
Vacuum precooler Download PDFInfo
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- CN218915501U CN218915501U CN202223246020.6U CN202223246020U CN218915501U CN 218915501 U CN218915501 U CN 218915501U CN 202223246020 U CN202223246020 U CN 202223246020U CN 218915501 U CN218915501 U CN 218915501U
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Abstract
The utility model relates to a vacuum precooler, which comprises a vacuum box body, a vacuum pipeline and a cooling pipeline, wherein precooled materials are stacked on one side of the vacuum box body, the top of the other side of the vacuum box body is connected with the vacuum pipeline, a demister, a main power-on valve, a cut-off control valve and a vacuum pump are sequentially arranged on the vacuum pipeline, a disc through pipeline with a bypass electromagnetic valve is connected between the main power-on valve and the cut-off control valve, the cooling pipeline is sequentially connected with a condenser, an expansion valve and a water catcher by a compressor and is formed by connecting a low-pressure sensor back to compression, the water catcher is arranged in the vacuum box body, a water collecting disc is arranged below the water catcher, and the low-pressure sensor, the main power-on electromagnetic valve, the cut-off control valve and the bypass electromagnetic valve are connected with a control box. The precooling machine can stabilize precooling operation at a constant speed, has high efficiency and is beneficial to safe operation of precooling equipment.
Description
Technical Field
The utility model relates to a refrigeration technology, in particular to a vacuum precooler.
Background
The traditional vacuum precooler has lower requirement on vacuumizing, only needs to obtain the vacuum value of the liquid water of the cooled object for evaporation, and omits the control of the liquid water of the cooled object in the total evaporation process; particularly, the cooled object is in the vacuum continuous descending process in the vacuum box, and the contained liquid water can be evaporated in a burst mode under a vacuum value of a certain value, which can be called as a burst stage; in general, the refrigeration system is designed and operated for constant cooling capacity, that is, the capacity of an evaporator or a water catcher of the refrigeration system is unchanged; if the designed cooling capacity is an average required value, the water capturing capacity is insufficient in the stage of water vapor explosion type generation, and part of water vapor enters a vacuum pump, so that the vacuum pump oil is quickly emulsified, and finally the lubrication of the vacuum pump is abnormal; if the designed cold quantity meets the explosion stage, the cold quantity is far greater than the required cold quantity under most conditions, the compressor is stopped at low pressure, the refrigerating low pressure value is restarted after rising, at least three minutes are required in the process of frequent starting of the compressor, the system can lose the water capturing capacity in the process of stopping the compressor, and the water vapor can still be continuously evaporated, so that most of the water vapor directly enters the vacuum pump, thereby causing rapid emulsification of the vacuum pump oil and finally causing abnormal lubrication of the vacuum pump.
Disclosure of Invention
The utility model provides the vacuum precooler which can stabilize precooling operation at a constant speed, has high efficiency and is beneficial to safe operation of precooling equipment.
The technical scheme adopted by the utility model is as follows: the utility model provides a vacuum precooling machine, includes vacuum box, vacuum pipeline and supplies cold pipeline, its characterized in that: precooling objects are stacked on one side of the vacuum box body, a vacuum pipeline is connected to the top of the other side of the vacuum box body, a demister, a main power-on solenoid valve, a cut-off control valve and a vacuum pump are sequentially arranged on the vacuum pipeline, a disc through pipeline with a bypass solenoid valve is connected between the main power-on solenoid valve and the cut-off control valve, a condenser, an expansion valve and a water catcher are sequentially connected to the cold pipeline through a compressor, the water catcher is formed by connecting a low-pressure sensor back to the vacuum box body, a water collecting disc is arranged below the water catcher, and the low-pressure sensor, the main power-on solenoid valve, the cut-off control valve and the bypass solenoid valve are connected to a control box which is connected to the vacuum pump and the compressor.
The water catcher is positioned in the vacuum box below the vacuum pipeline.
The water catcher is of a fin or tube type evaporator structure.
The outside of the water collecting disc is connected with a vacuum box body through a pipeline.
The bypass solenoid valve is a proportional solenoid valve.
The vacuum pipeline is arranged below the position of the communicating pipe orifice on the vacuum box body and is higher than the water baffle of the water catcher and is positioned above the water collecting disc.
And the water baffle is provided with a local through hole.
The precooling material is piled up in the vacuum box, the compressor is opened, the enthalpy value of the vapor in the vacuum box is absorbed by the water catcher through the condenser and the expansion valve, the vacuum pump is started, the main electromagnetic valve and the cut-off control valve are opened, the bypass electromagnetic valve is closed, the vacuum pump continuously pumps gas in the vacuum box, so that the air pressure in the box is reduced, the boiling point of liquid water contained in the cooled material is converted into the vapor along with the reduction of the air pressure and the phase change, and a large amount of enthalpy value of the cooled material is taken away by the vapor, the vapor is absorbed by the low-temperature surface of the cooled material when passing through the water catcher and converted into liquid water and collected by the water collecting disc, meanwhile, the vapor is intercepted by the demister at the inlet of the vacuum pipeline and falls into the vacuum box to the water collecting disc through the water retaining disc to collect, and meanwhile, the water retaining disc can play a role of blocking and condensing part of water carried out in the vacuumized gas, and the vapor is prevented from entering the vacuum pump; when the cooling temperature of the cooled object is reduced to the set temperature, the control box controls the vacuum pump to stop, the refrigerating system stops, the bypass electromagnetic valve is opened, external air enters the vacuum box body, the door of the vacuum box body is opened, the cooled object is taken out, and meanwhile, the water collecting disc discharges liquid water in the vacuum box body, and one cooling period is completed.
In a cooling period, when the liquid water in the object to be cooled is most intense in phase change, namely in an explosion stage, a large amount of heat is discharged, the load of the compressor is increased, the low-pressure side pressure is increased, the control box receives a signal value of a low-pressure sensor, the bypass electromagnetic valve is controlled to be opened in proportion to a certain opening degree, and the opening degree value is automatically adjusted according to the value of the low-pressure sensor; the ability of the vacuum pump to pump the gas inside the vacuum box is reduced, the pressure inside the vacuum box is reduced, the evaporation speed of liquid water in the cooled object is reduced, the heat load of a refrigerating pipeline is reduced, the situation that all water vapor cannot be captured by the water catcher in the explosion stage, and the water vapor enters the vacuum pump is avoided, the emulsification of vacuum pump oil is avoided, the running reliability of a machine set is improved, and the pre-cooling speed and pre-cooling quality are improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure: the vacuum box 1, the low pressure sensor 2, the main power-on valve 3, the bypass electromagnetic valve 4, the cut-off electromagnetic valve 5, the water catcher 6, the control box 7, the vacuum pump 8, the compressor 9, the condenser 10, the expansion valve 11, the water baffle 12, the demister 13 and the water collecting tray 14.
Detailed Description
Further description is provided below with reference to the accompanying drawings.
Fig. 1 shows: a vacuum precooler stacks precooled materials on one side of a vacuum box body 1, a vacuum pipeline is connected to the top of the other side, a demister 13, a main power-on valve 3, a cut-off control valve 5 and a vacuum pump 8 are sequentially arranged on a vacuum pipeline, a disc communication pipeline with a bypass electromagnetic valve 4 is connected between the main power-on electromagnetic valve and the cut-off control valve, and the bypass electromagnetic valve is a proportional electromagnetic valve. The water baffle 12 is arranged below the pipe orifice of the vacuum box body 1, the water catcher 6 is arranged below the water catcher 12, the water collecting disc 14 capable of collecting water discharged from the vacuum box body 1 is arranged below the water catcher 6, the air outlet of the water catcher 6 is connected with the low-pressure sensor 2 outside the vacuum box body 1 and then is connected with the compressor 9, the air outlet of the compressor 9 is connected with the condenser 10, the expansion valve 11 is connected with the water catcher 6, and the low-pressure sensor, the main electromagnetic valve, the cut-off control valve and the bypass electromagnetic valve are connected with the control box 7, and the control box is connected with the vacuum pump and the compressor.
In this embodiment, the water trap is a fin or tube evaporator structure.
Claims (7)
1. The utility model provides a vacuum precooling machine, includes vacuum box, vacuum pipeline and supplies cold pipeline, its characterized in that: precooling objects are stacked on one side of the vacuum box body, a vacuum pipeline is connected to the top of the other side of the vacuum box body, a demister, a main power-on solenoid valve, a cut-off control valve and a vacuum pump are sequentially arranged on the vacuum pipeline, a disc through pipeline with a bypass solenoid valve is connected between the main power-on solenoid valve and the cut-off control valve, a condenser, an expansion valve and a water catcher are sequentially connected to the cold pipeline through a compressor, the water catcher is formed by connecting a low-pressure sensor back to the vacuum box body, a water collecting disc is arranged below the water catcher, and the low-pressure sensor, the main power-on solenoid valve, the cut-off control valve and the bypass solenoid valve are connected to a control box which is connected to the vacuum pump and the compressor.
2. The vacuum pre-cooler of claim 1, wherein: the water catcher is positioned in the vacuum box below the vacuum pipeline.
3. A vacuum pre-cooler according to claim 1 or 2, characterized in that: the water catcher is of a fin or tube type evaporator structure.
4. The vacuum pre-cooler of claim 1, wherein: the outside of the water collecting disc is connected with a vacuum box body through a pipeline.
5. The vacuum pre-cooler of claim 1, wherein: the bypass solenoid valve is a proportional solenoid valve.
6. The vacuum pre-cooler of claim 1, wherein: the vacuum pipeline is arranged below the position of the communicating pipe orifice on the vacuum box body and is higher than the water baffle of the water catcher and is positioned above the water collecting disc.
7. The vacuum pre-cooler of claim 6, wherein: and the water baffle is provided with a local through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223246020.6U CN218915501U (en) | 2022-12-05 | 2022-12-05 | Vacuum precooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223246020.6U CN218915501U (en) | 2022-12-05 | 2022-12-05 | Vacuum precooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218915501U true CN218915501U (en) | 2023-04-25 |
Family
ID=86043774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223246020.6U Active CN218915501U (en) | 2022-12-05 | 2022-12-05 | Vacuum precooler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218915501U (en) |
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2022
- 2022-12-05 CN CN202223246020.6U patent/CN218915501U/en active Active
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