Adjustable inlet guide vane device

Abstract

The invention belongs to the technical field of power machinery, and relates to an adjustable inlet guide vane device which comprises guide vanes and an eccentric adjusting sleeve. The adjustable inlet guide vanes are a group of vanes mounted in front of an inlet of the impeller and can rotate around rotating shafts of the adjustable inlet guide vanes, a guide vane mounting angle is formed when the adjustable inlet guide vanes rotate by one angle, and air flow at the inlet of the impeller behind the adjustable inlet guide vanes is pre-swirled by changing the inlet guide vane mounting angle in front of the compressor wheel. And along with opening and closing of the inlet guide vane, the flow is changed by changing the through-flow sectional area, so that the working condition is adjusted. According to the device, the purpose of adjusting the angle of the inlet guide vane can be achieved only by replacing eccentric adjusting sleeves of different specifications, compared with a traditional guide vane adjusting driving mode, the problems that a mechanical device is large in occupied space, weak in active disturbance rejection capacity, complex in structure and the like are solved, and therefore the angle of the inlet guide vane can be adjusted more easily, conveniently and accurately.

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 an important part of the steam turbine. The turbine compressor is essentially an energy conversion machine. It is driven by the prime mover to make the impeller blades and the gas interact, thereby increasing the pressure and kinetic energy of the gas. Then, the flow element behind the impeller is used to reduce the speed of the gas and increase the pressure, so that the kinetic energy of the gas can be fully utilized to meet the demand for compressed gas in industry. At present, with the development of heavy industry, centrifugal compressors have become the key to compressing and transporting high-pressure gas. However, in the actual operation of centrifugal compressors, it is often necessary to control the gas flow entering the compressor due to climatic conditions and user needs. At present, the commonly used methods for regulating flow in centrifugal compressors are: inlet throttling, outlet throttling, variable speed regulation, and adjustable inlet guide vane regulation. Among them, the adjustable inlet guide vane regulation is also called intake pre-swirl regulation. The inlet guide vanes are installed in front of the compressor first stage. They can rotate around their own rotation axis. Each rotation angle is a guide vane installation angle, which changes the speed direction of the airflow before entering the impeller. With the opening and closing of the adjustable inlet guide vanes, the flow rate changes by changing the flow cross-sectional area, thereby realizing the adjustment of the working conditions. Therefore, conducting research on adjustable inlet guide vanes is of great significance to the energy saving of compressor operation.

[0003] However, the common traditional guide vane adjustment drive method currently usually adopts a hydraulic push rod and a linkage ring. It has obvious disadvantages, such as the mechanical device occupies a large space, has a complex structure, and has a weak self-interference resistance ability, which in turn affects the realization of the function of the guide vane adjustment device. Summary of the invention

[0004] In order to solve the above problems and make the guide vane adjustment device simpler, the present invention proposes an adjustable inlet guide vane device. The adjustable inlet guide vane of the present invention is a group of blades installed in front of the impeller inlet, which can rotate around their own rotation axis. Each rotation angle 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-swirled. With the opening and closing of the inlet guide vane, the flow rate changes by changing the flow cross-sectional area, thereby realizing the adjustment of the working condition.

[0005] The technical solution of the present invention is as follows:

[0006] An adjustable inlet guide vane device comprises a guide vane 2 and an eccentric adjustment sleeve 7; the guide vane 2 has four blind holes, the upper end has three blind holes, 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 the lower end has a blind hole, namely a first blind hole 21; an 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; an 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, its The upper end 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 with a pin a4, 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 with a pin b8; 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 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 guide vane 2 is positioned at the rotation angle by relying on the eccentric adjustment sleeve 7.

[0007] 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 a4 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 eccentric adjustment sleeves 7 of different specifications are set according to the eccentric distance. According to the actual requirements, the eccentric adjustment sleeves 7 of different specifications are replaced.

[0008] The eccentric adjustment sleeve 7 is fixed in the mounting hole of the outer casing 1 by means of jacking screws 11 passing 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 a 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 between the locking nut b10 and the inner hub 3.

[0012] The method for adjusting the guide vane angle by 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 common guide vane adjustment drive mode, 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 set any number of adjustable guide vanes according to actual use conditions, and increase or decrease according to actual needs. In addition, 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 according to needs.

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

[0017] Figure 1 It is a schematic diagram of the structural cross section 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 gasket, 7 eccentric adjustment sleeve, 8 pin b, 9 arc gasket, 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 . The device of the present invention is located between the outer casing 1 and the inner hub 3. The detailed installation method is as follows: 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 it is ensured 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. Further, the pin b8 connects the guide vane 2 to the inner hub 3 through the first blind hole 21, and an arc gasket 9 is installed to ensure good air tightness, and finally reinforced with a locking nut b10. Further, 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 a thick compression gasket 6 is installed 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 centers of the holes 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, and the eccentric distance of the eccentric adjustment sleeve is calculated according to the angle of deflection required by the guide vane, based on the different specifications of the eccentric adjustment sleeve 7, so as to assemble the eccentric adjustment sleeve of the corresponding specification. 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 screws 11 through the through holes on both sides; further, the angle of the guide vane can be 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 in total, 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); 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) has a plurality of blind holes at its upper end, each of which is provided with a plurality of blind holes. The pin a (4) passes through the third blind hole (23) and the corresponding mounting hole on the outer casing (1) and is fixed to the outer casing (1). 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 on the outer casing (1) corresponding to the second blind hole (22) and the third blind hole (23), and the pin a (4) passes 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, and 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 eccentric adjustment sleeves (7) of different specifications are set according to the eccentric distance, and the eccentric adjustment sleeves (7) of different specifications are replaced according to actual requirements.

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 means of a jacking screw 11 passing 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 a line connecting the centers of the two holes is a 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 between the locking nut a (5) and the outer casing (1).

5. An 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 between 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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