Dual-purpose vacuum unit for arc tunnel

Abstract

The application provides a dual-purpose vacuum unit suitable for an arc wind tunnel, through integrated design of a main pump, a forepump set and matched pipelines and valves, cooperative control of each valve and pump body is realized by cooperating with a control unit, operation modes can be flexibly switched according to actual test requirements, independent pre-extraction combinations need not to be additionally configured, the dual core functions of main extraction of a vacuum container and pre-extraction of a test cabin can be considered, the problem of large occupied area and redundant equipment layout caused by separate setting of two independent pump sets in the prior art is completely solved, the overall construction occupied space of the vacuum unit is greatly reduced, the purchase and installation cost of a special pre-extraction unit is saved, the pre-construction cost of the vacuum unit and the whole-cycle operation and maintenance cost of daily operation, inspection and maintenance are effectively reduced, the dual-extraction function is realized through mode switching of a single unit, the overall structure and operation process of the vacuum system are simplified, and the equipment utilization and operation flexibility of the vacuum unit are improved.

Description

Technical Field

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[0001] The present invention relates to the technical field of arc wind tunnel vacuum preparation equipment, and particularly to a dual-purpose vacuum unit applicable to an arc wind tunnel. Background Art

[0002] The vacuum system is the core supporting device of the arc wind tunnel test system, playing a key role in establishing a preset vacuum environment for the vacuum container and the test chamber and ensuring the normal arc ignition and stable test operation of the arc wind tunnel. The vacuum unit is the core power equipment of the entire vacuum system. Currently, the vacuum units conventionally supporting arc wind tunnels in the industry generally adopt a structural design in which two independent pump sets operate separately. They are respectively the main pump combination for large pumping speed suction of the vacuum container and the pre-pumping combination for pre-pumping the test chamber. Among them, the volume pumping speed of the main pump combination can usually reach 10,000 L / s, adapting to the suction requirements of the large volume and high vacuum degree of the vacuum container. The volume pumping speed of the pre-pumping combination is mostly 1,200 L / s, meeting the basic working conditions for pre-pumping the test chamber. The two pump sets are each equipped with independent pipelines, valves and control circuits, jointly completing the vacuum guarantee work for the entire process of the arc wind tunnel.

[0003] The above-mentioned existing configuration method of two independent pump sets, although it can meet the basic vacuum suction function, has many technical defects that are difficult to avoid in actual engineering applications and long-term operation and maintenance processes. First, the equipment layout is redundant and occupies a large area. The two independent pump sets and the supporting pipelines and accessories need to be laid separately, and the overall occupied site area is large, greatly increasing the space planning cost and infrastructure investment of the wind tunnel test station. Second, the equipment configuration is repeated and the construction cost is high. Both pump sets need to be equipped with complete pump bodies, pipelines, valves and control components. The number of parts is large, and the procurement and installation costs remain high. Third, the operation and maintenance costs are relatively high. The two pump sets need to be inspected daily, vulnerable parts need to be replaced and performance needs to be maintained separately. The operation and maintenance workload is large, and the consumption of supplies and energy consumption expenditures are relatively large. Fourth, the function is single and the flexibility is poor. The main pump combination and the pre-pumping combination can only perform their respective duties and cannot achieve function switching and complementarity. It is difficult to temporarily replace the operation when a single pump set fails, affecting the test progress and equipment utilization rate. Fifth, the pre-pumping operation efficiency is low. The pumping speed of the independent pre-pumping combination is limited, and it takes a long time to pre-pump the test chamber to the target vacuum degree, lengthening the preparation period of a single test of the arc wind tunnel and reducing the overall test efficiency.

[0004] In summary, the existing arc wind tunnel vacuum unit adopts a structural form in which two independent pump sets are separately arranged, and it has been unable to adapt to the current requirements of arc wind tunnel tests for equipment intensification, low cost, high flexibility and efficient operation. There is an urgent need to develop an integrated vacuum unit that can switch operating modes and has both main suction and pre-pumping dual functions. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-purpose vacuum unit suitable for electric arc wind tunnels, which can switch operating modes according to actual needs, and take into account both the main pump combination and the pre-evacuation combination functions, so as to provide a vacuum environment for electric arc wind tunnels.

[0006] In accordance with the above objectives, the present invention provides a dual-purpose vacuum unit suitable for electric arc wind tunnels, comprising a main pump, a backing pump assembly, a test chamber, and a control unit. The main pump is connected upstream to a vacuum container via a first pipeline, and downstream to the backing pump assembly via a second pipeline. The backing pump assembly is connected downstream to an exhaust gas treatment system. A first valve is installed on the first pipeline, a second valve is installed on the second pipeline, a third pipeline connects the second valve and the backing pump assembly on the second pipeline, and a fourth pipeline connects the first valve and the main pump on the first pipeline. Both the third and fourth pipelines are connected to the outlet end of the test chamber. A third valve is installed on the third pipeline, and a fourth valve is installed on the fourth pipeline. The main pump, backing pump assembly, first valve, second valve, third valve, and fourth valve are all electrically connected to the control unit.

[0007] Furthermore, it includes a main pump assembly for evacuating the vacuum container and the test chamber, the main pump assembly comprising a first pipeline, a first valve, a main pump, a second pipeline, a second valve, a fore-pump assembly, a fifth pipeline, a fourth pipeline, and a fourth valve connected in sequence.

[0008] Furthermore, it includes a pre-evacuation assembly for evacuating the test chamber, the pre-evacuation assembly comprising a third pipeline, a third valve, a fore-pump assembly, and a fifth pipeline connected in sequence.

[0009] Furthermore, the pumping speed of the main pump is 2 to 4 times that of the pumping speed of the backing pump set.

[0010] Furthermore, the first pipeline, the first valve, the fourth pipeline, and the fourth valve have the same diameter.

[0011] Furthermore, pressure transmitters for measuring airflow pressure are installed at the inlet ends of both the main pump and the backing pump set, and the pressure transmitters are electrically connected to the control unit.

[0012] Furthermore, both the main pump and the forepump set have variable frequency operation function. When the measured airflow pressure is in the warning zone, both the main pump and the forepump set automatically switch to low frequency operation mode.

[0013] Furthermore, both the main pump and the forepump set have automatic start-stop functions. When the measured airflow pressure is in the danger zone, the vacuum unit automatically stops running, and when the measured airflow pressure is in the safe zone, the vacuum unit automatically resumes operation.

[0014] Furthermore, all connections between the first pipeline, the first valve, the main pump, the second pipeline, the second valve, the forepump set, the fifth pipeline, the third pipeline, the third valve, the fourth pipeline, and the fourth valve are sealed connections, and all parts in contact with the exhaust gas from the wind tunnel are treated with anti-corrosion measures.

[0015] Furthermore, the airflow pressure value measured by the pressure transmitter is displayed on the display screen of the control unit.

[0016] The technical solution of this invention integrates the main pump, the backing pump set, and the supporting pipelines and valves into a single integrated design. Combined with the control unit, it achieves coordinated control of each valve and pump body, enabling flexible switching of operating modes according to actual test requirements. It eliminates the need for an additional independent pre-evacuation unit, thus simultaneously fulfilling the dual core functions of main vacuum container evacuation and test chamber pre-evacuation. This completely solves the problems of large footprint and redundant equipment layout caused by the separate setup of two independent pump sets in existing technologies. It significantly reduces the overall infrastructure space occupied by the vacuum unit, while also eliminating the procurement and installation costs of a dedicated pre-evacuation unit. This effectively reduces the initial construction costs of the vacuum unit and the full-cycle operation and maintenance costs for daily operation and inspection. Furthermore, by switching modes of a single unit to achieve dual evacuation functions, it simplifies the overall structure and operation process of the vacuum system, improves the equipment utilization and operational flexibility of the vacuum unit, and can adapt to the vacuum evacuation needs under different working conditions in an arc wind tunnel. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the unit structure layout of the present invention.

[0019] Explanation of reference numerals in the attached diagram: 1-First pipeline, 2-First valve, 3-Main pump, 4-Second pipeline, 5-Second valve, 6-Foreboard pump set, 7-Fifth pipeline, 8-Third pipeline, 9-Third valve, 10-Fourth valve, 11-Fourth pipeline. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example 1 like Figure 1 As shown, this invention provides a dual-purpose vacuum unit suitable for electric arc wind tunnels, including a main pump 3, a pre-pump assembly 6, a test chamber, and a control unit. The upstream of the main pump 3 is connected to a vacuum container via a first pipeline 1, and the downstream of the main pump 3 is connected to the pre-pump assembly 6 via a second pipeline 4. The downstream of the pre-pump assembly 6 is connected to an exhaust gas treatment system. A first valve 2 is installed on the first pipeline 1, a second valve 5 is installed on the second pipeline 4, a third pipeline 8 is connected to the second pipeline 4 between the second valve 5 and the pre-pump assembly 6, and a fourth pipeline 11 is connected to the first pipeline 1 between the first valve 2 and the main pump. Both the third pipeline 8 and the fourth pipeline 11 are connected to the outlet end of the test chamber. A third valve 9 is installed on the third pipeline 8. All connections between the first pipeline 1, the first valve 2, the main pump 3, the second pipeline 4, the second valve 5, the pre-pump assembly 6, the fifth pipeline 7, the third pipeline 8, the third valve 9, the fourth pipeline 11, and the fourth valve 10 are sealed connections, and all parts in contact with the exhaust gas of the wind tunnel are treated with anti-corrosion measures.

[0024] The main pump 3, the fore-pump assembly 6, the first valve 2, the second valve 5, and the third valve 9 are all electrically connected to the control unit. By controlling the start and stop of the main pump 3 and the fore-pump assembly 6, and the opening and closing of the valves, the operating mode of the unit can be switched, thus broadening the application range of the unit.

[0025] The diameters of the first pipeline 1, the first valve 2, the second pipeline 4, the fourth valve 10, and the fourth pipeline 11 are all 1500 mm. The diameters of the third pipeline 8 and the third valve 9 are 200 mm. The diameters of the second valve 5 and the fifth pipeline 7 are both 500 mm.

[0026] The pumping speed of the main pump 3 is 4 times that of the pumping speed of the back pump set 6. In this embodiment, the maximum volume pumping speed of the main pump 3 is designed to be 10,000 L / s, and the maximum volume pumping speed of the back pump set 6 is 2,500 L / s.

[0027] In this technical solution, the unit can be divided into a main pump assembly for evacuating the vacuum container and test chamber, and a pre-evacuation assembly for pre-evacuating the test chamber. The main pump assembly 3 includes a first pipeline 1, a first valve 2, a main pump 3, a second pipeline 4, a second valve 5, a backing pump set 6, a fifth pipeline 7, a fourth pipeline 11, and a fourth valve 10.

[0028] The pre-extraction assembly includes the third pipeline 8, the third valve 9, the fore-pump unit 6, and the fifth pipeline 7, which are connected in sequence.

[0029] Both the main pump 3 and the backing pump set 6 are equipped with pressure transmitters at their inlet ends for measuring airflow pressure. These pressure transmitters are electrically connected to the control unit, and the measured airflow pressure values ​​are displayed on the control unit's screen. This airflow pressure is divided into three zones: a safe zone, a warning zone, and a danger zone. Specifically, the main pump 3 has a safe zone (<2500 Pa), a warning zone (2500~3500 Pa), and a danger zone (≥3500 Pa); the backing pump set 6 has a safe zone (<3500 Pa), a warning zone (3500~5000 Pa), and a danger zone (≥5000 Pa). Both the main pump 3 and the backing pump set 6 have variable frequency operation capabilities. When the measured airflow pressure is within the warning zone, both the main pump 3 and the backing pump set 6 automatically switch to low-frequency operation mode. Both the main pump 3 and the forepump 6 have automatic start-stop functions. When the measured airflow pressure is in the danger zone, the vacuum unit will automatically stop running, and when the measured airflow pressure is in the safe zone, the vacuum unit will automatically resume operation.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-purpose vacuum unit suitable for electric arc wind tunnels, characterized in that, The system includes a main pump (3), a backing pump assembly (6), a test chamber, and a control unit. The main pump (3) is connected upstream to a vacuum container via a first pipeline (1), and downstream to the backing pump assembly (6) via a second pipeline (4). The backing pump assembly (6) is connected downstream to an exhaust gas treatment system. A first valve (2) is installed on the first pipeline (1), and a second valve (5) is installed on the second pipeline (4). A connection is established between the second valve (5) and the backing pump assembly (6) on the second pipeline (4). The third pipeline (8) is connected to the first pipeline (1) between the first valve (2) and the main pump. The third pipeline (8) and the fourth pipeline (11) are both connected to the outlet end of the test chamber. The third pipeline (8) is equipped with a third valve (9), and the fourth pipeline (11) is equipped with a fourth valve (10). The main pump (3), the fore-pump group (6), the first valve (2), the second valve (5), the third valve (9) and the fourth valve (10) are all electrically connected to the control unit.

2. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, It includes a main pump assembly for evacuating the vacuum container and test chamber, the main pump assembly including a first pipeline (1), a first valve (2), a main pump (3), a second pipeline (4), a second valve (5), a fore-pump assembly (6), a fifth pipeline (7), a fourth pipeline (11), and a fourth valve (10).

3. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, It includes a pre-evacuation assembly for evacuating the test chamber, the pre-evacuation assembly comprising a third pipeline (8), a third valve (9), a fore-pump assembly (6), and a fifth pipeline (7) connected in sequence.

4. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, The pumping speed of the main pump (3) is 2 to 4 times that of the pumping speed of the back pump set (6).

5. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, The first pipeline (1), the first valve (2), the fourth pipeline (11), and the fourth valve (10) have the same diameter.

6. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, The main pump (3) and the inlet of the fore-stage pump are both equipped with pressure transmitters for measuring airflow pressure, and the pressure transmitters are electrically connected to the control unit.

7. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, Both the main pump (3) and the fore-pump set (6) have variable frequency operation function. When the measured airflow pressure is in the warning area, both the main pump (3) and the fore-pump set automatically switch to low frequency operation mode.

8. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, Both the main pump (3) and the fore-pump set (6) have automatic start-stop functions. When the measured airflow pressure is in the danger zone, the vacuum unit will automatically stop running. When the measured airflow pressure is in the safe zone, the vacuum unit will automatically resume operation.

9. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 1, characterized in that, The connections between the first pipeline (1), the first valve (2), the main pump (3), the second pipeline (4), the second valve (5), the pre-pump group (6), the fifth pipeline (7), the third pipeline (8), the third valve (9), the fourth pipeline (11), and the fourth valve (10) are all sealed connections, and the parts that come into contact with the exhaust gas of the wind tunnel are all treated with anti-corrosion measures.

10. The dual-purpose vacuum unit suitable for electric arc wind tunnels according to claim 6, characterized in that, The airflow pressure value measured by the pressure transmitter is displayed on the screen of the control unit.

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