A power system for a wind tunnel using a counter-rotating fan and requiring negative pressure sealing

Abstract

The present invention provides a power system for a wind tunnel using counter-rotating fans and requiring negative pressure sealing, belonging to the field of wind tunnels. The system comprises a left / right power section cylinder, two sets of counter-rotating fans, a front / rear cover, two variable frequency motors, and two sets of front / rear baffles. The two sets of counter-rotating fans are respectively positioned in the gap between the head cover and the tail cover. The front cover and the tail cover each have a variable frequency motor installed inside. The output shaft of the variable frequency motor passes through the center hole of the front baffle and is connected to the counter-rotating fan on that side. The front end face boss of the outer shell of each variable frequency motor is sealed and fixedly connected to the front baffle. The side wall of the front baffle is sealed and fixedly connected to the side wall of the rear baffle. The outer edge of the rear baffle is sealed and fixedly connected to the inner wall of the cover on its corresponding side, thereby forming a static seal between the variable frequency motor and the counter-rotating fans. The present invention improves the stability of wind tunnel operation, greatly improves the sealing performance of the counter-rotating fans, reduces project costs, reduces the space required for motor installation, and facilitates installation and maintenance.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind tunnels, and in particular relates to a power system of a wind tunnel using a counter-rotating fan and having negative pressure sealing requirements. Background Art

[0002] At present, the power system of domestic wind tunnels generally adopts single-stage axial flow fans, which often means a longer power system and a larger floor space. In order to realize the disassembly and assembly of single-stage axial flow fans, the upper and lower splitting forms of the upper cover are usually used at the cave body and the fairing, that is, the motor cover is split out, and the motor cover is partially half-cut on the cylindrical cave body. The connection between the motor cover and the cylindrical body is two opposite semicircular sections, and the middle is a rectangular section. The connection between the semicircular section and the rectangular section is a right angle, which makes it difficult for the sealing strip at this position to fully fit with the sealing groove, reducing the sealing effect. Furthermore, dynamic seals are usually used for sealing between the motor and the fairing, which not only increases the cost, but also the dynamic seal will leak in a high negative pressure environment, which is not conducive to wind tunnels with high negative pressure requirements. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide a power system for a wind tunnel using a counter-rotating fan and having negative pressure sealing requirements, which is applicable to the power system of a wind tunnel having negative pressure sealing requirements.

[0004] The technical solution adopted for the purpose of the present invention is as follows: A power system for a wind tunnel using a counter-rotating fan and having a negative pressure sealing requirement, comprising a left power section cylinder, a right power section cylinder, two sets of counter-rotating fans, a front cover, a tail cover, two variable frequency motors, two sets of front baffles and two sets of rear baffles, the left power section cylinder and the right power section cylinder are fixedly connected by two sets of circular flanges to form a straight cylindrical power section cylinder, the front cover is located inside the left power section cylinder and is fixedly connected to its inner wall by multiple sets of support plates, the tail cover is located inside the right power section cylinder and is fixedly connected to its inner wall by multiple sets of support plates The front and rear baffles are fixedly connected to each other, and the two sets of counter-rotating fans are respectively placed opposite to each other in the gap between the front cover and the rear cover. Variable frequency motors are respectively installed inside the front and rear cover. The output shafts of the variable frequency motors pass through the center hole of the front baffle and are connected to the counter-rotating fans on that side. The front end boss of the outer shell of each variable frequency motor is tightly and fixedly connected to the front baffle. The side wall of the front baffle is tightly and fixedly connected to the side wall of the rear baffle. The outer edge of the rear baffle is tightly and fixedly connected to the inner wall of the cover on its corresponding side, thereby forming a static seal between the variable frequency motor and the counter-rotating fans.

[0005] Furthermore, an O-ring is sandwiched between the front end boss of the outer shell of the variable frequency motor and the front baffle, an O-ring is sandwiched between the front baffle and the rear baffle, and an O-ring is installed between the two groups of circular flanges.

[0006] Furthermore, the front cover, the tail cover, the left power section cylinder and the right power section cylinder have the same central axis.

[0007] Compared with the prior art, the beneficial effects of the present invention are: the present invention improves the stability of wind tunnel operation, divides the power section into two left and right sections, reduces the requirements for the installation space of the power section, and facilitates the future installation and maintenance of the power section; greatly improves the sealing performance of the cyclone fan, prevents leakage caused by the use of dynamic seals, reduces project costs, reduces the requirements for motor installation space, and facilitates the installation and maintenance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a cross-sectional view of the power system structure;

[0009] Figure 2 This is a cross-sectional view of the right power section structure;

[0010] Figure 3 This is a partial enlarged view of the sealing interface of the right power section;

[0011] Figure 4 This is an enlarged view of the connection between the left and right power section cylinders;

[0012] Figure 5 This is the positive isometric map of the power system.

[0013] Numbers in the figure: 1, left power section cylinder; 2, counter-rotating fan; 3, front cover; 4, tail cover; 5, variable frequency motor; 6, support plate; 7, front baffle; 8, O-ring; 9, rear baffle; 10, round flange; 11, front end boss; 12, right power section cylinder. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0015] Example 1

[0016] like Figure 1 As shown, a power system of a wind tunnel using a counter-rotating fan and requiring negative pressure sealing includes a left power section cylinder 1, a right power section cylinder 12, two sets of counter-rotating fans 2, a front cover 3, a rear cover 4, two variable frequency motors 5, two sets of front baffles 7 and two sets of rear baffles 9. Figure 4-5As shown, the left power section cylinder 1 and the right power section cylinder 12 are fixedly connected by two sets of circular flanges 10 to form a straight cylindrical power section cylinder. After being divided into the left power section cylinder and the right power section cylinder, the power section installation space requirement is greatly reduced, which is convenient for future installation and maintenance of the power section; an O-ring 8 is installed between the two sets of circular flanges 10, and the front cover 3 is located inside the left power section cylinder 1 and is fixedly connected to its inner wall by multiple sets of support plates 6, as shown in FIG. Figure 2 As shown, the tail cover body 4 is located inside the right power section cylinder 12 and is fixedly connected to its inner wall through multiple groups of support plates 6. The two sets of counter-rotating fans 2 are respectively placed in the gap between the front cover body 3 and the tail cover body 4. The front cover body 3 and the tail cover body 4 are respectively installed with a variable frequency motor 5. The output shaft of the variable frequency motor 5 passes through the center hole of the front baffle 7 and is connected to the counter-rotating fan 2 on this side. Figure 3 As shown, the front end face boss of the outer shell of each variable frequency motor 5 is tightly and fixedly connected to the front baffle 7, the side wall of the front baffle 7 is tightly and fixedly connected to the side wall of the rear baffle 9, and the outer edge of the rear baffle 9 is tightly and fixedly connected to the inner wall of the cover on its corresponding side, thereby forming a static seal between the variable frequency motor 5 and the counter-cyclone blower 2. An O-ring 8 is sandwiched between the front end face boss of the outer shell of the variable frequency motor 5 and the front baffle, and an O-ring 8 is sandwiched between the front baffle 7 and the rear baffle 9. The front cover body 3, the tail cover body 4, the left power section cylinder 1 and the right power section cylinder 12 are on the same central axis. This embodiment uses a static seal between the front baffle and the rear baffle and the front end face boss of the outer shell of the variable frequency motor instead of a dynamic seal, thereby preventing leakage caused by the use of a dynamic seal, greatly improving the sealing performance of the counter-cyclone blower, reducing the project cost, reducing the motor installation space requirement, and facilitating the installation and maintenance of the motor. This embodiment applies a counter-rotating fan to a wind tunnel power system in a subsonic negative pressure environment, which reduces the axial length compared to a traditional single-stage axial flow fan, thereby reducing losses and improving the stability of wind tunnel operation.

Claims

1. A power system for a wind tunnel using counter-rotating fans and requiring negative pressure sealing, comprising a left power section cylinder, a right power section cylinder, two sets of counter-rotating fans, a front cover, a rear cover, two variable frequency motors, two sets of front baffles, and two sets of rear baffles. The left power section cylinder and the right power section cylinder are fixedly connected by two sets of circular flanges to form a straight cylindrical power section cylinder. The system is characterized by: The front cover body is located inside the left power section cylinder and is fixedly connected to its inner wall through multiple groups of support plates. The tail cover body is located inside the right power section cylinder and is fixedly connected to its inner wall through multiple groups of support plates. The two sets of counter-rotating fans are respectively placed opposite to each other in the gap between the front cover body and the tail cover body. Variable frequency motors are respectively installed inside the front cover body and the tail cover body. The output shaft of the variable frequency motor passes through the center hole of the front baffle and is connected to the counter-rotating fan on this side. The front end face boss of the outer shell of each variable frequency motor is sealed and fixedly connected to the front baffle. The side wall of the front baffle is sealed and fixedly connected to the side wall of the rear baffle. The outer edge of the rear baffle is sealed and fixedly connected to the inner wall of the cover body on its corresponding side, thereby forming a static seal between the variable frequency motor and the counter-rotating fan.

2. The power system of a wind tunnel using a counter-rotating fan and requiring negative pressure sealing according to claim 1, characterized in that: An O-type sealing ring is sandwiched between the front end boss of the outer shell of the variable frequency motor and the front baffle, an O-type sealing ring is sandwiched between the front baffle and the rear baffle, and an O-type sealing ring is installed between the two groups of circular flanges.

3. A power system for a wind tunnel using a counter-rotating fan and requiring negative pressure sealing according to claim 1 or 2, characterized in that: The front cover, the tail cover, the left power section cylinder and the right power section cylinder share the same central axis.

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