Vacuum operation hypobaric chamber simulation chamber drainage device and automatic drainage method

Abstract

The invention relates to the technical field of low-pressure environment simulation, in particular to a vacuum operation hypobaric chamber simulation chamber drainage device and an automatic drainage method. The device comprises a hypobaric chamber, a simulation chamber, a drainage storage tank, a water ring vacuum pump, a drainage tank and a connecting pipeline. The simulation chamber is embedded in the low-pressure chamber, two ends of the chamber-penetrating drainage pipe are communicated with the simulation chamber drainage groove and an inlet of the drainage storage tank respectively, an outlet of the drainage storage tank is communicated with the water ring vacuum pump, the top of the drainage storage tank is communicated with the low-pressure chamber, and the water ring vacuum pump is communicated with the drainage tank. During vacuum operation of the hypobaric chamber, condensed water, sewage and the like generated in the simulation chamber are collected into accumulated water, and the accumulated water flows into the drainage storage tank from the drainage tank under the action of gravity. When the liquid level of the drainage storage tank rises to a set high liquid level, the high liquid level switch triggers the water ring vacuum pump to start automatically, and water in the drainage storage tank is pumped into the drainage tank and flows into a drainage system of the test bed through an overflow port of the drainage tank; and when the liquid level of the drainage storage tank is reduced to the set low liquid level, the low liquid level switch triggers the water ring vacuum pump to automatically stop. According to the invention, accumulated water in the hypobaric chamber simulation chamber can be efficiently and conveniently discharged, and the safety and accuracy of environment simulation under long-time vacuum operation are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-pressure environment simulation, and particularly relates to a low-pressure cabin simulation chamber drainage device and an automatic drainage method. BACKGROUND

[0002] In the prior art, some working condition tests need to simulate highland or high-altitude environments and need to be carried out under different air pressure, temperature and humidity conditions. In order to realize a low air pressure environment, a low-pressure cabin is usually designed as a sealed pressure-bearing structure. However, in the working condition test under low air pressure and high humidity, a large amount of condensate water is generated in the simulation chamber. Since the cabin is in a low-pressure state, when the drainage port is full, a pressure condition of 'high outside and low inside' is formed at the drainage port, so that the full drainage port forms a hole plug, which causes the accumulated water to be unable to be drained by relying on the natural pressure. If the accumulated water is too much, not only the safety of electrical equipment in the simulation chamber is threatened, but also the accuracy of temperature and humidity control during environment simulation is affected. At present, there is a lack of a general automatic drainage device in the prior art, and it is difficult to more economically and efficiently meet the automatic drainage requirements of the low-pressure environment simulation test device. SUMMARY

[0003] In order to avoid and overcome the technical problems existing in the prior art, the present application provides a low-pressure cabin simulation chamber drainage device and an automatic drainage method. The present application can effectively drain the accumulated water in the simulation chamber and improve the electrical safety.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A low-pressure cabin simulation chamber drainage device in a vacuum operation mode comprises a low-pressure cabin, a simulation chamber installed in the low-pressure cabin, a through-cabin drainage pipe communicated and installed at a drainage port at the bottom of the simulation chamber, the through-cabin drainage pipe penetrating out of the low-pressure cabin and communicated with a drainage storage tank, the top of the drainage storage tank communicated with the low-pressure cabin through a pressure balance pipe, and the simulation chamber, the through-cabin drainage pipe, the drainage storage tank and the low-pressure cabin in sequence communicated to form a vacuum cavity isolated from the atmospheric environment.

[0006] As a further scheme of the present application, an outlet at the bottom of the drainage storage tank is communicated and installed with a water ring vacuum pump for pumping out the accumulated water stored in the inside of the drainage storage tank, and a one-way valve is further installed between the water ring vacuum pump and the drainage storage tank to prevent the accumulated water from flowing back.

[0007] As a further scheme of the present application, the inside of the drainage storage tank is sequentially arranged from top to bottom with a high liquid level switch and a low liquid level switch, and the high liquid level switch and the low liquid level switch are located between the inlet and the outlet of the drainage storage tank, so as to start the water ring vacuum pump to pump water when the liquid level in the drainage storage tank rises to the high liquid level switch, and to stop the water ring vacuum pump to pump water when the liquid level in the drainage storage tank falls to the low liquid level switch.

[0008] As a further solution of the present invention, a sight glass for observing the liquid level inside the drainage tank is installed on the outside of the drainage tank.

[0009] As a further solution of the present invention: a drainage groove connected to the drainage outlet is opened at the bottom of the simulation chamber, and the drainage groove is arranged inclined toward the drainage outlet.

[0010] As a further solution of the present invention, a filter screen is arranged at the inlet of the through-cabin drainage pipe.

[0011] As a further solution of the present invention, a drainage box is installed at the outlet of the water ring vacuum pump.

[0012] As a further solution of the present invention, the tops of the drainage storage tank and the drainage box are both connected and installed with openable and closable tap water pipes.

[0013] As a further solution of the present invention, the bottoms of the drainage storage tank and the drainage box are both connected and installed with openable and closable sewage pipes.

[0014] An automatic drainage method, which uses the above-mentioned vacuum-operated low-pressure cabin simulation chamber drainage device, includes the following steps:

[0015] S1. Close all valves in the device and evacuate the low-pressure chamber to a vacuum state;

[0016] S2: Condensation water begins to form in the simulation chamber and gathers in the drainage trough;

[0017] S3. The accumulated water in the drainage trough flows through the filter screen and flows into the drainage storage tank through the through-tank drainage pipe;

[0018] S4, the liquid level in the drainage tank gradually increases and reaches the high liquid level switch; the high liquid level switch detects the accumulated water, at this time, the high liquid level switch and the low liquid level switch simultaneously send a high liquid level alarm to the water ring vacuum pump, and the water ring vacuum pump starts to pump water;

[0019] S5. The liquid level in the drainage tank gradually decreases and reaches the low liquid level switch. At this time, the low liquid level switch and the high liquid level switch simultaneously send a low liquid level alarm to the water ring vacuum pump, and the water ring vacuum pump stops pumping water;

[0020] S6. Execute steps S2-S5 in a loop until the liquid level is between the high liquid level switch and the low liquid level switch.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The device of the present application realizes automatic drainage of condensate water in a low-pressure environment by using the principle of communicating vessels through the construction of a vacuum drainage system, avoiding the problem of the limitation of traditional natural drainage by air pressure difference; the vacuum cavity is completely isolated from the atmospheric environment, ensuring the stability of the air pressure in the low-pressure cabin, eliminating the safety hazards of accumulated water to electrical equipment, avoiding the interference of water evaporation with the control accuracy of temperature and humidity, and providing a reliable drainage solution for highland / high-altitude environment simulation test.

[0023] 2. A water ring vacuum pump and a one-way valve are added at the bottom of the drainage tank to break through the bottleneck of automatic drainage efficiency through active water pumping mechanism, which can quickly drain a large amount of accumulated water under high humidity conditions; the one-way valve prevents external gas backflow or water flow reversal during water pumping, maintains the stability of the air pressure in the vacuum cavity, and is especially suitable for long-time test scenarios that continuously produce condensate water, ensuring the reliability and sustainability of the drainage system.

[0024] 3. High and low liquid level switches are used to control the start and stop of the water ring vacuum pump, realizing the automation of accumulated water treatment: when the liquid level reaches the high liquid level switch, the water pumping is automatically started to avoid the risk of lagging accumulated water caused by manual intervention; when the liquid level drops to the low liquid level switch, the water ring vacuum pump is accurately stopped to prevent equipment life loss caused by idling. This mechanism, combined with real-time liquid level monitoring, optimizes energy consumption while ensuring drainage effect, and improves the intelligence level of the system.

[0025] 4. The sight glass provides a visual monitoring window for the internal liquid level of the drainage tank, which is convenient for the operator to intuitively judge the liquid level state and the working efficiency of the water ring vacuum pump; the transparent material design (such as glass or acrylic) has both sealing and observation convenience, which can assist in verifying the accuracy of the liquid level switch control logic, especially providing key reference basis for system debugging or troubleshooting, enhancing the human-machine interaction experience.

[0026] 5. The inclined drainage groove design at the bottom of the simulation chamber guides the condensate water to quickly converge to the drainage port through physical slope, reducing the accumulated water retention area and time in the simulation chamber; the structured flow guide avoids random diffusion of water flow, improves drainage efficiency, and reduces the risk of water immersion to electrical equipment, especially suitable for precise environmental simulation scenarios with high ground flatness requirements.

[0027] 6. The filter screen at the inlet of the cabin drainage pipe can intercept solid impurities (such as dust and equipment debris) in the condensate water, preventing pipe blockage or water ring vacuum pump impeller wear.

[0028] 7. The water ring vacuum pump outlet is connected to a special drainage tank, which provides a centralized collection and processing space for the discharged accumulated water, avoiding pollution or resource waste caused by direct discharge to the external environment; the drainage tank can be matched with water quality monitoring or recycling devices to meet environmental protection requirements or recycling needs, enhancing the adaptability and compliance of the system in different test scenarios.

[0029] 8. The openable tap on the top of the drainage tank and the drainage tank, which supports manual or automatic water injection function: on the one hand, it can be used for pipeline flushing or liquid level calibration during system debugging, and on the other hand, it can supplement clean water source to the vacuum cavity when needed (such as humidity simulation), thereby expanding the multifunctionality of the device; the openable design takes into account the sealing property and the operation convenience, thereby avoiding the influence of external gas on the low-pressure environment simulation.

[0030] 9. The openable drain pipe at the bottom provides a convenient channel for removing impurities, so as to facilitate the periodic discharge of sediment, oil stains and other pollutants deposited in the drainage tank and the drainage tank, prevent long-term accumulation from affecting the performance of the equipment or generating odor; the drain operation can be quickly completed during the non-test period without disassembling the main components, thereby reducing the maintenance complexity and ensuring the long-term stable operation of the system.

[0031] 10. The automatic drainage process realizes the whole-process non-human intervention of the drainage process under the low-pressure environment through the standardized steps of "vacuum pressure building-condensed water gathering-liquid level triggering-water pumping cycle"; the closed-loop control logic ensures that each water pumping is based on the actual liquid level demand, thereby avoiding the resource waste of traditional time-based drainage or the safety hazard of time-based drainage, especially suitable for long-time unattended test scenarios, thereby improving the overall test efficiency and safety. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the device principle diagram of the present application.

[0033] Figure 2 is the structure diagram of the connection between the simulation chamber and the drainage tank in the device of the present application.

[0034] Figure 3 is the main equipment plane layout diagram of the device of the present application.

[0035] Figure 4 is the automatic drainage method flow chart of the present application.

[0036] In the figure: 1, low-pressure cabin; 2, simulation chamber; 3, cabin drainage pipe; 4, filter; 5, drainage tank; 6, high liquid level switch; 7, low liquid level switch; 8, one-way valve; 9, water ring vacuum pump; 10, drainage tank; 11, drainage tank overflow; 12, drainage tank inlet; 13, drainage tank outlet; 14, drainage tank tap; 15, drainage tank drain; 16, drainage tank tap; 17, drainage tank drain; 18, water ring communication pipe; 19, pressure balance pipe; 20, sight glass; 21, drainage tank; 22, filter screen; 23, external ground. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] As shown in the drawings, Figure 1 A low-pressure cabin simulation room drainage device operating in vacuum includes a low-pressure cabin 1, a simulation room 2, a drainage storage tank 5, a water ring vacuum pump 9, a drainage tank 10, and a communication pipeline, etc. The simulation room 2 is embedded in the inside of the low-pressure cabin 1, both ends of the cabin-penetrating drainage pipe 3 are connected with the simulation room drainage groove 21 and the drainage storage tank inlet 12 respectively, the drainage storage tank outlet 13 is connected with the water ring vacuum pump 9 and its top is connected with the low-pressure cabin 1. The water ring vacuum pump 9 is connected with the drainage tank 10, and the drainage tank overflow port 11 is connected with the external drainage pipeline. When the low-pressure cabin 1 operates in vacuum, the accumulated water in the simulation room 2 flows into the drainage storage tank 5, the water ring vacuum pump 9 and the drainage tank 10 in turn through the cabin-penetrating drainage pipe 3, and finally is discharged through the drainage tank overflow port 11 of the drainage tank 10.

[0039] When operating in vacuum, the air pressure in the low-pressure cabin 1, the cabin-penetrating drainage pipe 3 and the drainage storage tank 5 is consistent. In order to be able to withstand the difference between the internal and external atmospheric pressure, the low-pressure cabin 1 and the drainage storage tank 5 are designed as pressure-bearing equipment made of stainless steel, which has certain anti-deformation ability and rust prevention ability. The top of the drainage storage tank 5 is connected with the low-pressure cabin 1 through the pressure balance pipe 19, the pressure balance pipe 19 is made of stainless steel capillary tube, which can connect the low-pressure cabin 1 and the drainage storage tank 5 and ensure that the internal air pressure of the two is consistent in real time, avoiding the difference in air pressure between the low-pressure cabin 1 and the drainage storage tank 5 caused by the rapid change of cabin air pressure or the change of drainage flow, affecting the drainage efficiency and working stability of the drainage device when operating in vacuum.

[0040] As shown in the drawings, Figure 2 , Figure 3 The wallboard and floor of the simulation room 2 are made of double-faced color steel or stainless steel polyurethane library board, the floor surface is embedded with the drainage groove 21, the drainage groove 21 is connected with the cabin-penetrating drainage pipe 3 through the hole at the end, the drainage outlet position is installed with the filter screen 22, which preliminarily filters to avoid the blockage of the drainage pipeline by sundries. The drainage groove 21 is made of stainless steel and has a depth of 30-50 mm, and the bottom forms a certain slope along the drainage outlet direction, which is convenient for the accumulated water to flow out to the cabin-penetrating drainage pipe 3 under the action of gravity. In addition, the present drainage device is arranged near the position of the cabin-penetrating drainage pipe 3, the overall layout is compact and occupies small space, which can improve the space utilization rate.

[0041] A filter 4 is installed between the low-pressure cabin 1 and the drain storage tank 5, i.e. the extracapsular part of the drain pipe 3, to achieve secondary filtration and prevent sundries from entering the drain storage tank 5 and subsequent pipelines. A Y-shaped filter is used to facilitate the disassembly, cleaning and installation of the filter element.

[0042] A one-way valve 8 is installed between the drain storage tank 5 and the water ring vacuum pump 9 to prevent the water in the drain tank 10 from flowing back to the drain storage tank 5 and the simulation chamber 2 when the low-pressure cabin is in vacuum operation.

[0043] The pump cavity of the water ring vacuum pump 9 is connected to the drain tank 10 through a water ring communication pipe 18, and the water ring communication pipe 18 sucks an appropriate amount of water from the drain tank 10 as the working fluid of the water ring vacuum pump 9. The maximum suction of the water ring vacuum pump 9 should meet the maximum vacuum degree of the low-pressure cabin 1.

[0044] The drain storage tank 5 is provided with a float ball liquid level switch, including a high liquid level switch 6 and a low liquid level switch 7, and both of them are made of stainless steel. An acrylic sight glass 20 is installed on the side of the drain storage tank 5, and the height range of the sight glass 20 should cover the drain storage tank inlet 12 and the drain storage tank outlet 13 to facilitate observation of the liquid level in the tank when necessary.

[0045] The extracapsular drain pipe 3 should be higher than the ground 23 by a certain distance, so that all the accumulated water flows into the drain storage tank 5 under the action of gravity, ensuring that the height and drainage capacity of the storage tank are within the control range. The high liquid level switch 6 of the drain storage tank 5 should be lower than the drain storage tank inlet 12, and the low liquid level switch 7 should be higher than the drain storage tank outlet 13, while maintaining a certain height difference between the high liquid level switch 6 and the low liquid level switch 7. The top of the drain storage tank 5 is provided with a drain storage tank tap water interface 14 for internal flushing and liquid level adjustment; and the bottom is provided with a drain storage tank sewage outlet 15 for discharging solid impurities deposited in the tank body, and both of them use ball valves to realize on-off.

[0046] The installation height of each interface on the drain storage tank 5 is as follows: drain storage tank tap water interface 14 > inlet 12 > high liquid level switch 6 > low liquid level switch 7 > outlet 13 > sewage outlet 15.

[0047] The drain tank 10 is provided with a drain tank tap water interface 16 at the top, and a drain tank sewage outlet 17 at the bottom, and both of them use ball valves to realize on-off. A float ball valve is arranged on the inner side of the water tank at the drain tank tap water interface 16 to realize automatic water replenishment, ensuring that the liquid level of the drain tank 10 is higher than the interface height of the water ring communication pipe 18 of the water ring vacuum pump 9, so as to continuously and stably provide working fluid for the water ring vacuum pump 9. The overflow port 11 of the drain tank should be higher than the drain tank tap water interface 16 and maintain a certain distance from the top of the drain tank 10, ensuring that the periodic drainage capacity of the water ring vacuum pump 9 during each start is not more than the remaining volume of the drain tank 10. The drainage capacity of each drainage cycle is the volume between the high liquid level switch 6 and the low liquid level switch 7 in the drain storage tank 9.

[0048] The installation height of each interface on the drain tank 10 is as follows: drain tank inlet > drain tank overflow port 11 > drain tank tap water interface 16 > water ring connecting pipe 18 interface > drain tank drain port 17.

[0049] The valve switch is as follows: before the start of the vacuum test, the ball valves at the drain tank tap water interface 14, the drain tank outlet 15 and the drain tank drain port 17 are closed; the ball valve at the drain tank tap water interface 16 is opened, and the ball valve is closed after the automatic water replenishment to the height of the drain tank tap water interface 16; during the test, each ball valve is kept closed; when the drain device is overhauled, drained or cleaned, the corresponding ball valve can be opened.

[0050] An automatic drainage method for a low-pressure cabin simulation chamber in vacuum operation, which automatically controls the water ring vacuum pump 9 according to the feedback signals of the high liquid level switch 6 and the low liquid level switch 7 of the drain tank. As shown in FIG. 1, the method comprises the following steps: Figure 4

[0051] S1: When the liquid level in the drain tank 5 rises to the high liquid level, the high liquid level switch 6 and the low liquid level switch 7 both output signals to trigger the high liquid level alarm, and the water ring vacuum pump 9 is automatically started, and the water in the drain tank 5 is pumped into the drain tank 10 through the connecting pipeline.

[0052] S2: When the liquid level in the drain tank 5 drops below the low liquid level, the high liquid level switch 6 and the low liquid level switch 7 both stop signal output, triggering the low liquid level alarm, and the water ring vacuum pump 9 is automatically stopped to avoid idling; as the accumulated water gradually flows into the drain tank 5, the liquid level rises again, and then the process of S1-S2 is repeated to realize automatic drainage.

[0053] S3: When the liquid level in the drain tank 5 is between the high and low liquid levels, the high liquid level switch 6 and the low liquid level switch 7 both have no signal output, and the water ring vacuum pump 9 does not need to be started.

[0054] Meanwhile, the automatic drainage and manual drainage can be switched in the PLC program, and the water ring vacuum pump 9 can be manually controlled to start and stop when the drain device needs to be overhauled, drained or cleaned.

[0055] In the normal pressure and low pressure environment, the drain device can realize the automatic drainage of the simulation chamber in the continuous working condition without any manual operation, and the drainage efficiency and stability are not affected by the change of the cabin air pressure, and has the advantages of simple operation and easy maintenance.

[0056] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, and any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.​

Claims

1. A vacuum-operated low-pressure cabin simulation chamber drainage device, characterized in that: The invention comprises a low-pressure cabin (1), a simulation chamber (2) is installed in the low-pressure cabin (1), a through-cabin drainage pipe (3) is installed at the drainage port at the bottom of the simulation chamber (2), the through-cabin drainage pipe (3) passes through the low-pressure cabin (1) and is connected to a drainage storage tank (5), and the top of the drainage storage tank (5) is connected to the low-pressure cabin (1) through a pressure balance pipe (19); the simulation chamber (2), the through-cabin drainage pipe (3), the drainage storage tank (5) and the low-pressure cabin (1) are connected in sequence to form a vacuum chamber isolated from the atmospheric environment.

2. The drainage device for a low-pressure cabin simulation chamber in vacuum operation according to claim 1, characterized in that: The outlet at the bottom of the drainage storage tank (5) is connected to a water ring vacuum pump (9) for extracting the accumulated water stored therein, and a one-way valve (8) is also installed between the water ring vacuum pump (9) and the drainage storage tank (5) to prevent the accumulated water from flowing back.

3. The drainage device for a low-pressure cabin simulation chamber in vacuum operation according to claim 2, characterized in that: A high liquid level switch (6) and a low liquid level switch (7) are arranged in sequence from top to bottom inside the drainage storage tank (5), and the high liquid level switch (6) and the low liquid level switch (7) are located between the inlet and the outlet of the drainage storage tank (5), so that when the liquid level in the drainage storage tank (5) rises to the high liquid level switch (6), the water ring vacuum pump (9) is started to pump water, and when the liquid level in the drainage storage tank (5) falls back to the low liquid level switch (7), the water ring vacuum pump (9) is stopped to pump water.

4. A drainage device for a low-pressure cabin simulation chamber in vacuum operation according to claim 3, characterized in that: The outer side of the drainage storage tank (5) is connected to and provided with a sight glass tube (20) for observing the liquid level inside the drainage storage tank (5).

5. A vacuum-operated low-pressure cabin simulation chamber drainage device according to any one of claims 1 to 4, characterized in that: A drainage groove (21) communicating with the drainage outlet is provided at the bottom of the simulation chamber (2), and the drainage groove (21) is arranged inclined toward the drainage outlet.

6. The drainage device for a vacuum-operated low-pressure cabin simulation chamber according to claim 5, characterized in that: A filter screen (22) is arranged at the inlet of the through-drain pipe (3).

7. The drainage device for a low-pressure cabin simulation chamber in vacuum operation according to claim 6, characterized in that: The outlet of the water ring vacuum pump (9) is connected to a drainage box (10).

8. The drainage device for a vacuum-operated low-pressure cabin simulation chamber according to claim 7, characterized in that: The tops of the drainage storage tank (5) and the drainage box (10) are both connected and installed with openable and closable tap water pipes.

9. The drainage device for a vacuum-operated low-pressure cabin simulation chamber according to claim 8, characterized in that: The bottoms of the drainage storage tank (5) and the drainage box (10) are both connected and equipped with an openable and closable sewage pipe.

10. An automatic drainage method, which uses the vacuum-operated low-pressure cabin simulation chamber drainage device according to claim 9, characterized in that: The following steps are involved: S1. Close all valves in the device and evacuate the low-pressure chamber (1) to a vacuum state; S2, condensed water begins to be generated in the simulation chamber (2) and gathers in the drainage trough (21); S3, the accumulated water in the drainage trough (21) flows through the filter screen (22) and flows into the drainage storage tank (5) through the through-drain pipe (3); S4, the liquid level in the drainage storage tank (5) gradually increases and reaches the high liquid level switch (6); the high liquid level switch (6) detects the accumulation of water, at which point the high liquid level switch (6) and the low liquid level switch (7) simultaneously send a high liquid level alarm to the water ring vacuum pump (9), and the water ring vacuum pump (9) starts pumping water; S5, the liquid level in the drainage tank (5) gradually decreases and reaches the low liquid level switch (7), at which time the low liquid level switch (7) and the high liquid level switch (6) simultaneously send a low liquid level alarm to the water ring vacuum pump (9), and the water ring vacuum pump (9) stops pumping water; S6. Circulate steps S2-S5 until the liquid level is between the high liquid level switch (6) and the low liquid level switch (7).

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