An adjustable inlet guide vane device

Abstract

The present invention belongs to the field of power machinery technology, and relates to an adjustable inlet guide vane device, comprising: guide vanes and eccentric adjustment sleeves. The adjustable inlet guide vanes are a group of blades installed in front of the impeller inlet, which can rotate around their own rotation axis. Each angle of rotation is a guide vane installation angle. By changing the inlet guide vane installation angle in front of the compressor wheel, the impeller inlet airflow behind it is pre-rotated. As the inlet guide vanes open and close, the flow rate changes by changing the flow cross-sectional area, thereby achieving the adjustment of the working conditions. This device can achieve the purpose of adjusting the inlet guide vane angle by simply replacing eccentric adjustment sleeves of different specifications. Compared with the traditional guide vane adjustment drive method, it solves the problems of large space occupied by the mechanical device, weak self-anti-interference ability, and complex structure, thereby making the adjustment of the inlet guide vane angle simpler and more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of power machinery and relates to an adjustable inlet guide vane device. Background Art

[0002] The compressor is a crucial component of a steam turbine. Essentially, a turbine compressor is an energy conversion machine. Driven by a prime mover, the interaction between the impeller blades and the gas increases the gas's pressure and kinetic energy. Flow elements behind the impeller then reduce the gas's velocity and increase its pressure, fully utilizing the gas's kinetic energy to meet industrial demand for compressed gas. With the development of heavy industry, centrifugal compressors have become crucial for compressing and transporting high-pressure gas. However, in actual operation, centrifugal compressors often require control of the gas flow entering the compressor, depending on climatic conditions and user needs. Common flow control methods for centrifugal compressors include meter-in, meter-out, variable speed control, and adjustable inlet guide vane control. Adjustable inlet guide vane control, also known as inlet pre-swirl control, involves installing inlet guide vanes before the compressor's first stage. These vanes rotate about their axis, with each degree of rotation representing a guide vane installation angle, changing the direction of the airflow before entering the impeller. Opening and closing the adjustable inlet guide vanes alters the flow rate by changing the cross-sectional area, thereby adjusting operating conditions. Therefore, conducting research on adjustable inlet guide vanes is of great significance to the energy saving of compressor operation.

[0003] However, the current common traditional guide vane adjustment drive method usually uses a hydraulic push rod and a linkage ring. This has obvious disadvantages, such as the large mechanical device takes up a lot of space, has a complex structure, and has weak self-interference rejection capabilities, which in turn affects the function of the guide vane adjustment device. Summary of the Invention

[0004] To address the aforementioned issues and simplify guide vane adjustment, the present invention proposes an adjustable inlet guide vane device. The adjustable inlet guide vanes are a set of blades installed before the impeller inlet. They rotate about their own rotational axis, with each degree of rotation representing a guide vane installation angle. By changing the inlet guide vane installation angle before the compressor wheel, the airflow at the impeller inlet is pre-swirled. As the inlet guide vanes open and close, the flow rate changes by altering the flow cross-sectional area, thereby adjusting the operating conditions.

[0005] The technical solutions of the present invention are as follows:

[0006] An adjustable inlet guide vane device includes a guide vane 2 and an eccentric adjustment sleeve 7; the guide vane 2 has four blind holes, three blind holes at the upper end, namely a second blind hole 22, a third blind hole 23 and a fourth blind hole 24, the second blind hole 22 and the third blind hole 23 are located on both sides of the fourth blind hole 24, and there is a blind hole at the lower end, namely a first blind hole 21; the outer casing 1 of the guide vane ring is provided with mounting holes corresponding to the second blind hole 22, the third blind hole 23 and the fourth blind hole 24 respectively; the inner hub 3 of the guide vane ring is provided with a mounting hole corresponding to the first blind hole 21; the guide vane 2, which The upper end is fixed to the outer casing 1 by using a pin a4 to pass through the third blind hole 23 and the corresponding mounting hole on the outer casing 1, and the lower end is fixed to the inner hub 3 by using a pin b8 to pass through the first blind hole 21 and the corresponding mounting hole on the inner hub 3; the eccentric adjustment sleeve 7 is embedded in the mounting holes corresponding to the second blind holes 22 and the third blind holes 23 on the outer casing 1, and the pin a4 is passed through the second blind hole 22 and the fourth blind hole 24 on the guide vane 2 and the eccentric adjustment sleeve 7, so that the guide vane 2 is connected to the eccentric adjustment sleeve 7, and the eccentric adjustment sleeve 7 is used to complete the rotation angle positioning of the guide vane 2.

[0007] The eccentric adjustment sleeve 7 is cylindrical and made of stainless steel. It has three through-holes, the diameter of the central through-hole being larger than the diameters of the through-holes on either side. The central through-hole is the eccentric hole for the pin a4 to pass through. The distance between the center of the eccentric hole and the center of the outer circle is the eccentricity. The centers of the through-holes on either side are aligned with the center of the outer circle. The eccentricity is calculated based on the required deflection angle, and different sizes of eccentric adjustment sleeves 7 are provided based on the eccentricity. Different sizes of eccentric adjustment sleeves 7 can be replaced based on actual requirements.

[0008] The eccentric adjustment sleeve 7 is fixed in the mounting hole of the outer casing 1 by lifting screws 11 through the through holes on both sides.

[0009] The first blind hole 21 and the third blind hole 23 on the guide vane 2 are coaxial, and a line connecting the centers of the two holes is the rotation axis of the guide vane 2 .

[0010] The pin a4 is locked by a locking nut a5; a compression gasket 6 is provided between the contact surface of the locking nut a5 and the outer casing 1.

[0011] The pin b8 is locked by a locking nut b10; a curved gasket 9 is provided between the contact surface of the locking nut b10 and the inner hub 3.

[0012] The method for adjusting the guide vane angle of the device of the present invention is: first determine the angle at which the guide vane needs to be deflected under different operating conditions when the unit is running, thereby calculating the eccentricity of the eccentric adjustment sleeve 7, and further replace the eccentric adjustment sleeve of corresponding specifications to complete the rotation angle positioning of the guide vane.

[0013] Compared with the currently common guide vane adjustment drive method, the present invention has at least the following beneficial effects:

[0014] (1) The device has a simple structure and solves the problems of traditional hydraulic mechanical devices such as large space occupation and high weight, thus saving design costs to a great extent.

[0015] (2) The present invention can be configured with any number of adjustable guide vanes according to actual usage, and can be increased or decreased according to actual needs. Furthermore, the present invention does not require external mechanical drive to adjust the guide vane angle, so the guide vanes at any position on the guide vane ring can be adjusted as needed.

[0016] (3) The eccentric adjustment sleeves with different eccentricities can precisely control the guide vane deflection angle, making the present invention more precise and convenient in controlling the airflow direction. At the same time, it can avoid errors caused by fluctuations during the transition process when adjusting the guide vane angle using a mechanical drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural cross-sectional view of the adjustable inlet guide vane device of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the local section at point A in the middle.

[0019] Figure 3 It is a schematic top view of the adjustable inlet guide vane device of the present invention.

[0020] Figure 4 It is a partial top view cross-sectional schematic diagram of the adjustable inlet guide vane device of the present invention.

[0021] Figure 5 It is a structural schematic diagram of the eccentric adjustment sleeve of the present invention.

[0022] In the figure: 1 outer casing, 2 guide vane, 21 first blind hole, 22 second blind hole, 23 third blind hole, 24 fourth blind hole, 3 inner hub, 4 pin a, 5 locking nut a, 6 thick compression washer, 7 eccentric adjustment sleeve, 8 pin b, 9 arc washer, 10 locking nut b, 11 jacking screw. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0024] Figure 1 The schematic diagram of the overall structure of the present invention is shown in FIG. 1 , which shows the device of the present invention located between the outer casing 1 and the inner hub 3. Figure 2-Figure 4As shown, the adjustable inlet guide vane device of the present invention is composed of a guide vane 2, a pin a4, an eccentric adjustment sleeve 7, and a pin b8. The guide vane 2 is installed between the outer casing 1 and the inner hub 3, and ensures that the lower surface of the guide vane 2 is tangent to the surface of the inner hub 3, and the upper surface of the guide vane 2 is tangent to the surface of the outer casing 1, thereby ensuring that there is no gap between the guide vane 2 and the outer casing 1 and the inner hub 3. Furthermore, the pin b8 connects the guide vane 2 to the inner hub 3 through the first blind hole 21, and adds a camber gasket 9 to ensure good air tightness, and finally reinforced with a locking nut b10. Furthermore, the pin a4 connects the guide vane 2 to the outer casing 1 through the second blind hole 22, the third blind hole 23, and the fourth blind hole 24, and adds a thick compression gasket 6 to prevent air leakage, and finally reinforced with a locking nut b5. The eccentric adjustment sleeve 7 is embedded in the mounting hole of the outer casing 1, and the position is as shown. Figure 2 As shown, further, the pin a4 connects the eccentric adjustment sleeve 7 to the guide vane 2 through the second blind hole 22 and the fourth blind hole 24, so as to achieve the purpose of using the eccentric adjustment sleeve 7 to adjust the angle of the guide vane 2.

[0025] The first blind hole 21 and the third blind hole 23 of the guide vane 2 are coaxial, and the line connecting the hole centers is the rotation axis of the guide vane 2, so that the guide vane 2 can be rotated to adjust the angle. Figure 5 As shown, the eccentric adjustment sleeve 7 is the core of the present invention. The rotation angle direction of the guide vane 2 is positioned by the different specifications of the eccentric adjustment sleeve 7. The eccentricity of the eccentric adjustment sleeve is calculated according to the angle of deflection required by the guide vane, so that the eccentric adjustment sleeve of the corresponding specification can be assembled. The installation method of the eccentric adjustment sleeve 7 is as follows: Figure 4 As shown, the eccentric adjustment sleeve 7 is fixed in the mounting hole of the outer casing 1 by lifting the screws 11 through the through holes on both sides; further, the angle of the guide vane is adjusted on the outer casing 1 by replacing the eccentric adjustment sleeve 7 with different eccentric distances to meet the needs of different working conditions.

Claims

1. An adjustable inlet guide vane device, characterized in that: The adjustable inlet guide vane device comprises a guide vane (2) and an eccentric adjustment sleeve (7); the guide vane (2) has four blind holes, three blind holes at the upper end, namely the second blind hole (22), the third blind hole (23) and the fourth blind hole (24), the second blind hole (22) and the third blind hole (23) are located on both sides of the fourth blind hole (24), and there is a blind hole at the lower end, namely the first blind hole (21); the outer casing (1) of the guide vane ring is provided with mounting holes corresponding to the second blind hole (22), the third blind hole (23) and the fourth blind hole (24); the inner hub (3) of the guide vane ring is provided with a mounting hole corresponding to the first blind hole (21); the guide vane (2) is provided with a mounting hole corresponding to the first blind hole (21) at its upper end; The pin a (4) is fixed to the outer casing (1) by passing through the third blind hole (23) and the corresponding mounting hole on the outer casing (1), and the lower end is fixed to the inner hub (3) by passing through the first blind hole (21) and the corresponding mounting hole on the inner hub (3) using the pin b (8); the eccentric adjustment sleeve (7) is embedded in the mounting holes corresponding to the second blind hole (22) and the third blind hole (23) on the outer casing (1), and the pin a (4) is passed through the second blind hole (22) and the fourth blind hole (24) on the guide vane (2) and the eccentric adjustment sleeve (7), so that the guide vane (2) is connected to the eccentric adjustment sleeve (7), and the guide vane (2) is positioned at a rotation angle by relying on the eccentric adjustment sleeve (7); The eccentric adjustment sleeve (7) is a cylinder made of stainless steel. The eccentric adjustment sleeve (7) is provided with three through holes, the diameter of the middle through hole is larger than the diameter of the through holes on both sides. The middle through hole is an eccentric hole for the pin a (4) to pass through. The distance between the center of the eccentric hole and the center of the outer circle is the eccentric distance. The centers of the through holes on both sides and the center of the outer circle are located on the same straight line. According to the requirements of the deflection angle, the eccentric distance is calculated and obtained. Eccentric adjustment sleeves (7) of different specifications are set according to the eccentric distance. According to actual requirements, the eccentric adjustment sleeves (7) of different specifications are replaced.

2. The adjustable inlet guide vane device according to claim 1, characterized in that: The eccentric adjustment sleeve (7) is fixed in the mounting hole of the outer casing (1) by lifting screws 11 through the through holes on both sides.

3. An adjustable inlet guide vane device according to claim 1 or 2, characterized in that: The first blind hole (21) and the third blind hole (23) on the guide vane (2) are coaxial, and the center line connecting the two holes is the rotation axis of the guide vane (2).

4. An adjustable inlet guide vane device according to claim 1 or 2, characterized in that: The pin a (4) is locked by a locking nut a (5); a compression gasket (6) is provided between the contact surface of the locking nut a (5) and the outer casing (1).

5. The adjustable inlet guide vane device according to claim 1 or 2, characterized in that: The pin b (8) is locked by a locking nut b (10); a curved gasket (9) is provided between the contact surface of the locking nut b (10) and the inner hub (3).

6. An adjustable inlet guide vane device according to claim 1 or 2, characterized in that: The eccentric adjustment sleeve (7) is made of stainless steel.

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