CN215234281U - External pressure-bearing type high-low temperature damp-heat low-pressure test box capable of preventing damp air from entering heat insulation layer - Google Patents

Abstract

The utility model discloses an avoid humid air to get into outer pressure-bearing formula high low temperature damp heat low pressure test box of heat preservation, evacuation solenoid valve's inlet end links to each other with communicating pipe subassembly, communicating pipe subassembly includes vertical pipe, inner bag communicating pipe and heat preservation communicating pipe, vertical pipe, inner bag communicating pipe and heat preservation communicating pipe connect into F shape, the water-collecting box is connected to the lower extreme of vertical pipe, the lower extreme of water-collecting box is provided with the outlet, be provided with the valve that drains in this outlet, evacuation solenoid valve's inlet end and vertical union coupling, and evacuation solenoid valve's inlet end and vertical union coupling's interface are located between inner bag communicating pipe and the heat preservation communicating pipe. The utility model discloses an avoid humid air to get into outer pressure-bearing formula high low temperature damp heat low pressure test box reasonable in design of heat preservation, use a period after, the heat preservation need not dry the heat preservation repeatedly, energy saving and time. The water discharging valve is opened periodically to discharge water, the operation is simple and convenient, and the pressure balance effect is not influenced.

Description

External pressure-bearing type high-low temperature damp-heat low-pressure test box capable of preventing damp air from entering heat insulation layer

Technical Field

The utility model relates to a proof box technical field, concretely relates to avoid humid air to get into outer pressure-bearing formula high low temperature damp and hot low pressure test box of heat preservation.

Background

The high-low temperature damp-heat low-pressure test chamber applied to the environmental test equipment generally has two structural forms: one is in an internal pressure bearing structure form, and the other is in an external pressure bearing structure form. The inner pressure bearing structure is characterized in that the inner container bears pressure, the plate used by the inner container is thicker, the material is a stainless steel plate, the price is higher, the inner material is thick, the load is higher in the processes of refrigeration and heating, the refrigeration compressor is larger in selection, the heating power is also larger, the total cost is higher than the outer pressure bearing, the energy consumption is larger, the structure is simple and compact, the occupied space is smaller, and the manufacturing difficulty is smaller. The outer pressure-bearing structural style is that the shell bears pressure, and the used panel of shell is than thicker, and the material can for the two-sided anti-rust treatment of steel sheet, and the price is cheaper, and outer material is thick, and interior material is just thinner, and the load is just little in refrigeration and heating process, just is littleer selecting for use refrigeration compressor, and heating power is also less, so total cost is cheaper than interior pressure-bearing, and the use energy consumption is also less, but the structure is more complicated, and occupation of land space is relatively great, and the manufacturing degree of difficulty is some great relatively.

A working chamber of the high-low temperature damp-heat low-pressure test chamber is used for exhausting air from the interior of a box body by a vacuum pump under the environment condition of low temperature or high temperature so as to enable the interior of the box body to reach a low-pressure value, such as 500 Pa. The high-low temperature damp-heat low-pressure test box with the external pressure-bearing structure not only needs to pump out the air of the working chamber during air pumping, but also needs to pump out the air in the heat-insulating layer between the inner container and the shell. Air in the liner and the heat-insulating layer needs to be synchronously pumped out, otherwise, pressure difference is formed between the liner and the heat-insulating layer, and the liner is thin and cannot bear pressure, so that the liner is subjected to plastic deformation and cannot be restored to the original state, and the liner is damaged. The pressure balancing device between the inner container and the heat insulation layer of the outer pressure-bearing temperature and humidity low-pressure test box is a communicating device between the inner container and the heat insulation layer, so that the inner container and the heat insulation layer are synchronously pumped to achieve pressure balance.

The existing pressure balancing device is shown in figure 1 and comprises an inner container, an outer container and a heat insulation layer arranged between the inner container and the outer container, wherein a vacuum pump is arranged outside the outer container, an air inlet pipe of the vacuum pump is connected with an air outlet of a drying device, an air inlet of the drying device is connected with an air exhaust end of a vacuumizing electromagnetic valve through a pipeline, the air exhaust end of the electromagnetic valve is connected with an inner container communicating pipe, and a communicating hole communicated with the heat insulation layer is formed in a part of the inner container communicating pipe penetrating through the heat insulation layer. The inner container and the heat-insulating layer are pumped by a vacuum pump, so that the pressure balance effect can be realized, the structure is simpler, but the test box with low temperature and temperature damp and hot is not enough to communicate the air pressure balance. When a high-temperature high-humidity test is carried out (the air humidity is high), the air extraction valve is turned off, the air humidity of the working chamber of the box body is high, wet air can enter the heat-insulating layer through the communicating hole, the temperature of the heat-insulating layer is lower than that of the working chamber, condensed water is generated, the heat-insulating material is wetted (the water content of the heat-insulating material is increased), the heat-insulating effect of the heat-insulating material is reduced, and the energy consumption is increased. If the heat preservation effect obviously worsens, need open test box empty box heating operation, dry the intraformational moisture of heat preservation, consume energy like this and take time. And after the heat preservation layer is used for a long time, the drying effect of the heat preservation layer is poorer and poorer, so that the heat preservation effect is poorer and poorer, and the heating or refrigerating energy consumption is higher.

SUMMERY OF THE UTILITY MODEL

To exist not enough among the prior art, the utility model aims to provide an avoid humid air to get into the outer pressure-bearing formula high low temperature damp and hot low pressure test box of heat preservation.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an outer pressure-bearing type high-low temperature damp-heat low-pressure test box for preventing damp air from entering a heat insulation layer comprises an inner container, an outer container and the heat insulation layer arranged between the inner container and the outer container, wherein a vacuum pump is arranged outside the outer container, an air inlet pipe of the vacuum pump is connected with an air outlet of a drying device, an air inlet of the drying device is connected with an air outlet end of a vacuumizing electromagnetic valve through a pipeline, an air inlet end of the vacuumizing electromagnetic valve is connected with a communicating pipe assembly, the communicating pipe assembly comprises a vertical pipe, an inner container communicating pipe and a heat insulation layer communicating pipe, the vertical pipe, the inner container communicating pipe and the heat insulation layer communicating pipe are connected into an F shape, the vertical pipe is positioned outside the outer container, the inner container communicating pipe is communicated with the inner container and positioned above the heat insulation layer communicating pipe, the end part of the heat insulation layer communicating pipe is sealed and stretched into the heat insulation layer, and a communicating hole is arranged on the part of the heat insulation layer communicating pipe positioned in the heat insulation layer, the lower end of the vertical pipe is connected with the water collecting box, a water outlet is formed in the lower end of the water collecting box, a water drain valve is arranged on the water outlet, the air inlet end of the vacuumizing electromagnetic valve is connected with the vertical pipe, and the interface of the air inlet end of the vacuumizing electromagnetic valve and the connection of the vertical pipe is located between the liner communicating pipe and the heat-insulating layer communicating pipe.

In the air exhaust process, the inner container communicating pipe and the heat-insulating layer communicating pipe are simultaneously exhausted by using a vacuum pump, so that the pressure difference between the inner container and the heat-insulating layer can not be generated, the purpose of pressure balance is achieved, and the inner container can not be deformed due to pressure imbalance. When the vacuumizing electromagnetic valve is turned off, the air humidity in the inner container is high when a high-temperature and high-humidity test is carried out, the air water content is high, the inner container communicating pipe and the heat preservation communicating pipe are separated, and the inner container communicating pipe and the heat preservation communicating pipe are connected through the vertical pipe outside the outer container. The intercommunicating pore is on heat preservation communicating pipe, humid air in the box will be through longer vertical pipeline and heat preservation communicating pipe, just can reach the connecting hole department on the heat preservation communicating pipe, because external environment temperature is lower than the box inside temperature (if the temperature difference is not too much, absolute humidity in the box can not be too big yet, itself just has no influence to the heat preservation air), humid air is at the in-process through the pipeline, most moisture in the air has condensed the water droplet and has dripped on the inner tube wall, just drip in the water-collecting box after reaching certain big water droplet, humid air after the condensation has become drier, basically with the intraformational air humidity difference of heat preservation not much, so can not influence the heat preservation effect of heat preservation. Thereby not only balancing the pressure, but also not influencing the air humidity in the heat preservation layer. The water in the water collecting box is discharged by opening the valve at regular intervals.

In the scheme, the method comprises the following steps: the outer wall of the outer container is provided with a humidifier, and a water vapor exhaust pipe of the humidifier is communicated with the inner container.

In the scheme, the method comprises the following steps: the insulating layer communicating pipe extends to the middle of the insulating layer.

Has the advantages that: the utility model discloses an avoid humid air to get into outer pressure-bearing formula high low temperature damp heat low pressure test box reasonable in design of heat preservation, use a period after, the heat preservation need not dry the heat preservation repeatedly, energy saving and time. The water discharging valve is opened periodically to discharge water, the operation is simple and convenient, and the pressure balance effect is not influenced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention before improvement.

Fig. 2 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments:

as shown in fig. 2, the external pressure-bearing high-low temperature damp-heat low-pressure test box for preventing damp air from entering the heat insulation layer is composed of an inner container 1, an outer container 2, a heat insulation layer 3, a vacuum pump 4, a humidifier 5, an evaporator 6, a heater 7, a drying device 8, a vacuumizing electromagnetic valve 9, a vertical pipe 10, an inner container communicating pipe 11, a heat insulation layer communicating pipe 12, a communicating hole 13, a water collecting box 14 and a water drain valve 15.

The outer wall of the outer liner 1 is provided with a humidifier 5, and a water vapor exhaust pipe of the humidifier 5 is communicated with the inner liner 1. The inner container 1 is also provided with a heater 7 and an evaporator 6, which are prior art. The heat preservation layer 3 between the inner container 1 and the outer container 2, the vacuum pump 4 is arranged outside the outer container 1, an air inlet pipe of the vacuum pump 4 is connected with an air outlet of the drying device 8, an air inlet of the drying device 8 is connected with an air outlet end of the vacuumizing electromagnetic valve 9 through a pipeline, an air inlet end of the vacuumizing electromagnetic valve 9 is connected with the communicating pipe assembly, the communicating pipe assembly comprises a vertical pipe 10, an inner container communicating pipe 11 and a heat preservation layer communicating pipe 12, the vertical pipe 10, the inner container communicating pipe 11 and the heat preservation layer communicating pipe 12 are connected into an F shape, wherein the vertical pipe 10 is positioned outside the outer liner 2, the liner communicating pipe 11 is communicated with the liner 1 (working chamber) and positioned above the heat-insulating layer communicating pipe 12, the end part of the heat-insulating layer communicating pipe 12 extends into the heat-insulating layer 3, and the end part is sealed, and a communication hole 13 is provided in a portion of the insulating layer communication tube 12 located inside the insulating layer, and preferably the insulating layer communication tube 12 extends to the middle of the insulating layer 3. The lower end of the vertical pipe 10 is connected with a water collecting box 14, the lower end of the water collecting box 14 is provided with a water outlet, a water drain valve 15 is arranged on the water outlet, the air inlet end of the vacuumizing electromagnetic valve 9 is connected with the vertical pipe 10, and the interface of the air inlet end of the vacuumizing electromagnetic valve 9 connected with the vertical pipe 10 is positioned between the liner communicating pipe 11 and the heat-insulating layer communicating pipe 12.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (3)

1. The utility model provides an avoid humid air to get into outer pressure-bearing formula high low temperature damp and hot low pressure test box of heat preservation, includes inner bag, outer courage and sets up the heat preservation between inner bag and outer courage, outer courage is provided with the vacuum pump outward, the intake pipe of vacuum pump links to each other with drying device's gas vent, drying device's air inlet passes through the pipeline and links to each other its characterized in that with the exhaust end of evacuation solenoid valve: the air inlet end of the vacuumizing electromagnetic valve is connected with the communicating pipe assembly, the communicating pipe assembly comprises a vertical pipe, an inner container communicating pipe and a heat preservation communicating pipe, the vertical pipe, the inner container communicating pipe and the heat preservation communicating pipe are connected into an F shape, the vertical pipe is located outside the outer container, the inner container communicating pipe is communicated with the inner container and located above the heat preservation communicating pipe, the end portion of the heat preservation communicating pipe is sealed and extends into the heat preservation layer, a communicating hole is formed in the portion, located in the heat preservation layer, of the heat preservation communicating pipe, the lower end of the vertical pipe is connected with a water collecting box, a water outlet is formed in the lower end of the water collecting box, a water drain valve is arranged on the water outlet, the air inlet end of the vacuumizing electromagnetic valve is connected with the vertical pipe, and an interface, connected with the vertical pipe, of the air inlet end of the vacuumizing electromagnetic valve is located between the inner container communicating pipe and the heat preservation communicating pipe.

2. The external pressure-bearing type high-low temperature damp-heat low-air-pressure test box for preventing damp air from entering the insulating layer according to claim 1, is characterized in that: the outer wall of the outer container is provided with a humidifier, and a water vapor exhaust pipe of the humidifier is communicated with the inner container.

3. The external pressure-bearing type high-low temperature damp-heat low-air-pressure test box for preventing damp air from entering the insulating layer according to claim 2, is characterized in that: the insulating layer communicating pipe extends to the middle of the insulating layer.

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