Anti-instability cylinder device and instability adjusting method of turbomachinery

Abstract

The application discloses a kind of anti-instability cylinder device and instability adjusting method of turbomachinery, belong to turbomachinery technical field, device includes cylinder body, one end of the cylinder body is installed for air current to enter the adjustable air inlet of the cylinder body, the bottom of the cylinder body two sides are respectively installed first pressure sensor and second pressure sensor, for respectively detecting the side pressure of the cylinder body, the adjustable air inlet includes outer baffle cover and inner baffle cover, between by several circumferential distribution stationary vanes be connected, the stationary vane is controlled inclination angle by drive motor to adjust the rotational moment that the adjustable air inlet is received, the drive motor is provided with control signal by control unit, the control unit receives the signal input of the first pressure sensor and the second pressure sensor.The application controls the inclination angle of the stationary vane of adjustable air inlet when cylinder body is subjected to rotational moment, reduces tangential force, to improve the stability of cylinder body.

Description

Technical Field

[0001] This invention relates to the field of turbine machinery technology, and in particular to an anti-instability cylinder device and instability adjustment method for turbine machinery. Background Technology

[0002] Turbines are bladed, dynamic fluid machines. A common characteristic of turbines is the high-speed rotation of a bladed rotor. As fluid (gas or liquid) flows through the channels between the blades, forces interact between the blades and the fluid, thereby converting energy. Steam turbines, air expanders, and other turbine devices are widely used in industrial production. To improve the work capacity of turbines, modern turbines mostly employ axial flow designs. The basic work unit of an axial flow turbine is called a stage, and each stage consists of a set of moving blades and stationary blades. To ensure efficient operation of the moving blades, the gap between the moving blades and the cylinder is generally very small. The airflow expands and accelerates in the stationary blades, generating tangential forces on the moving blades, which in turn cause them to rotate and perform work. In reality, the airflow also generates tangential forces as it passes through the stationary blades. However, because the stationary blades are fixed to the cylinder, they cannot rotate, but the tangential forces are transmitted to the cylinder, forming a rotational torque, which becomes one of the main factors contributing to cylinder instability.

[0003] Therefore, the cylinders used in traditional turbine machinery are not stable enough and cannot meet the actual needs of use. Summary of the Invention

[0004] The present invention aims to solve the problem of cylinder instability caused by rotational torque, and provides an anti-instability cylinder device and instability adjustment method for turbine machinery, which has the advantages of good stability, simple structure and low cost of use.

[0005] Firstly, to achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An anti-instability cylinder device for turbine machinery includes a cylinder body with a fixed claw mounted on the bottom of the cylinder body. A through hole is formed at one end of the cylinder body, and an adjustable air inlet for airflow into the cylinder body is installed within the through hole. A first pressure sensor and a second pressure sensor are respectively installed on both sides of the bottom of the fixed claw to detect the side pressure of the cylinder body. The adjustable air inlet includes an outer partition sleeve and an inner partition sleeve, both also having an annular structure. The outer and inner partition sleeves are connected by a plurality of circumferentially distributed stationary blades. The stationary blades are tilted at an angle controlled by a drive motor to adjust the rotational torque on the adjustable air inlet. The drive motor is controlled by a control unit, which receives signal inputs from the first and second pressure sensors.

[0007] Preferably, the cylinder body includes an outer cylinder and an inner cylinder, which are spaced apart and connected by reinforcing ribs, and the drive motor is installed in the gap between the outer cylinder and the inner cylinder.

[0008] Preferably, the two ends of the stationary blade are hinged to the outer partition sleeve and the inner partition sleeve respectively, wherein the inner partition sleeve is fixedly installed and the outer partition sleeve is movably installed, and the tilt angle of the stationary blade is adjusted by driving the outer partition sleeve to move through the drive motor.

[0009] Preferably, the outer partition sleeve is installed at the end of the inner cylinder by a return spring, and a sliding sleeve is fitted on the outer wall of the inner cylinder. One end of the sliding sleeve is in contact with the outer partition sleeve, and the other end is connected to the drive motor. The outer partition sleeve is moved by driving the sliding sleeve through the drive motor.

[0010] Preferably, the outer wall of the sliding sleeve is provided with helical grooves, and the output shaft of the drive motor is connected to a gear disk, which meshes with the helical grooves.

[0011] Preferably, the outer partition sleeve is connected to the end of the outer cylinder by a sealing ring.

[0012] Preferably, a rubber pad is provided at the bottom of the fixed cat paw, and an installation groove is formed in the rubber pad, in which the first pressure sensor and the second pressure sensor are both fixed.

[0013] Preferably, there are two of each of the first and second pressure sensors.

[0014] Secondly, to achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0015] A method for regulating the instability of a turbine machine, using the anti-instability cylinder device as described in any one of claims, the method comprising the following steps:

[0016] Step 1: Acquire the pressure values ​​of the first sensor and the second sensor in real time, and record them as the first pressure value R1 and the second pressure value R2, respectively.

[0017] Step 2: Initiate adjustment detection and calculate whether the pressure difference Δ=|R1-R2| on both sides exceeds % of the cylinder block's own weight. If it does not exceed, the process ends; if it does, a control signal is sent to the control unit.

[0018] Step 3: The control unit activates the drive motor to tilt the stationary blades by 1°, and then executes Step 2 again.

[0019] Step four: Check if the turbine is in the off state. If it is off, the drive motor will rotate in the opposite direction and the stationary blades will reset. Otherwise, repeat steps two through four.

[0020] Preferably, the method further includes at least two sensors, a first sensor and a second sensor, wherein the calculated first pressure value R and the second pressure value R are both average pressure values.

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

[0022] 1. This invention sets the air inlet of the cylinder block as an adjustable air inlet, and the stationary blades of the adjustable air inlet can be tilted by a drive motor. When the airflow applies a tangential force to the adjustable air inlet, the drive motor controls the stationary blades to adjust the tilt angle to reduce the tangential force, thereby reducing the rotational torque on the cylinder block, thus improving the stability of the cylinder block and reducing the occurrence of instability.

[0023] 2. This invention collects the pressure values ​​of the fixed cat claws on both sides of the cylinder block and uses the pressure difference to determine whether the stationary blades need to be adjusted, thus achieving the effect of detecting stability. This detection is more intuitive and has a simple structure, making it economical and practical. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the cylinder device of the present invention.

[0025] Figure 2 This is a schematic diagram of the internal structure of the cylinder block of the present invention.

[0026] Figure 3 This is a schematic diagram of the adjustable air inlet installation structure of the present invention.

[0027] Figure 4 This is a schematic diagram of the stationary blade mounting structure of the present invention.

[0028] Figure 5 This is a flowchart of the instability adjustment method of the present invention.

[0029] In the diagram: 1. Cylinder block, 2. Adjustable air inlet, 3. Fixed cat claw, 4. First pressure sensor, 5. Second pressure sensor, 6. Outer cylinder, 7. Inner cylinder, 8. Reinforcing rib, 9. Drive motor, 10. Sliding sleeve, 11. Outer partition sleeve, 12. Stationary blade, 13. Inner partition sleeve, 14. Return spring, 15. Rubber pad, 16. Helical tooth groove, 17. Gear disk, 18. Sealing ring, 19. Hinge. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Example 1

[0032] like Figure 1As shown, an anti-instability cylinder device for turbine machinery includes a cylinder body 1. A fixing claw 3 is installed at the bottom of the cylinder body 1 to fix the cylinder body 1 to a stable platform. A through hole is opened at one end of the cylinder body 1, and an adjustable air inlet 2 for airflow into the cylinder body 1 is installed in the through hole. A first pressure sensor 4 and a second pressure sensor 5 are respectively installed on both sides of the bottom of the fixing claw 3 to measure the pressure exerted by the left and right sides of the cylinder body 1 on the fixing claw 3, and to detect the side pressure of the cylinder body 1. The first pressure sensor 4 and the second pressure sensor 5 are positioned on both sides of the centerline of the cylinder body 1. Figure 4 The diagram shows the detailed structure of the adjustable air inlet 2, which includes an outer partition sleeve 11 and an inner partition sleeve 13, both of which are annular structures. The outer partition sleeve 11 and the inner partition sleeve 13 are connected by a plurality of circumferentially distributed stationary blades 12. The stationary blades 12 are tilted at an angle controlled by a drive motor 9 to adjust the rotational torque on the adjustable air inlet 2. The drive motor 9 is provided with a control signal by a control unit, which receives signal inputs from the first pressure sensor 4 and the second pressure sensor 5.

[0033] The control unit is used to send and receive signals and process them. After receiving signal inputs from the first pressure sensor 4 and the second pressure sensor 5, it can calculate whether the stationary vane 12 needs to be adjusted. If adjustment is needed, a control signal will be output to the drive motor 9. At this time, the drive motor 9 will control the stationary vane 12 to tilt. The control unit determines whether the stationary vane 12 needs to be adjusted based on the fact that, under normal conditions, the cylinder block 1 is in a stable state and the pressure values ​​of the first pressure sensor 4 and the second pressure sensor 5 are basically the same. However, when there is a tangential force on the adjustable air inlet 2, the cylinder block 1 will be subjected to a rotational torque, which will cause the balance on both sides to be broken. This will result in the pressure value of the first pressure sensor 4 or the second pressure sensor 5 being too high. After the stationary vane 12 is tilted, the tangential force will decrease, and the rotational torque on the cylinder block 1 will also decrease, thereby maintaining the stability of the cylinder block 1.

[0034] like Figure 2 As shown, the cylinder body 1 includes an outer cylinder 6 and an inner cylinder 7, which are spaced apart and connected by reinforcing ribs 8. The drive motor 9 is installed in the gap between the outer cylinder 6 and the inner cylinder 7. The cylinder body 1 adopts a two-layer structure, which allows for easy adjustment of the mechanism for the stationary vane 12, which is installed in the gap between the outer cylinder 6 and the inner cylinder 7, reducing the volume of the cylinder body 1. Furthermore, the outer cylinder 6 effectively protects the inner cylinder 7, preventing accidents caused by the moving vane colliding with the inner cylinder 7. The reinforcing ribs 8 enhance the connection stability between the two cylinders. Figure 4As shown, the two ends of the stationary blade 12 are hinged to the outer partition sleeve 11 and the inner partition sleeve 13 respectively via hinges 19. The inner partition sleeve 13 is fixedly installed, while the outer partition sleeve 11 is movably installed. The outer partition sleeve 11 is moved by the drive motor 9 to adjust the tilt angle of the stationary blade 12. The tilt angle of the stationary blade 12 can be adjusted by the outer partition sleeve 11 being movable and the inner partition sleeve 13 being fixed. Since the inner partition sleeve 13 is fixed, when the outer partition sleeve 11 moves, it will pull one end of the stationary blade 12 to move, while the other end of the stationary blade 12 is fixed, thus changing the tilt angle of the stationary blade 12. The movement of the outer partition sleeve 11 is controlled by the drive motor 9, which can precisely control the distance of each movement and provide more precise control.

[0035] like Figure 2 As shown, the outer partition sleeve 11 is installed at the end of the inner cylinder 7 via a return spring 14. A sliding sleeve 10 is fitted on the outer wall of the inner cylinder 7. One end of the sliding sleeve 10 contacts the outer partition sleeve 11, and the other end is connected to the drive motor 9. The drive motor 9 drives the sliding sleeve 10 to slide and control the movement of the outer partition sleeve 11. Since the outer partition sleeve 11 needs to be displaced, and since the two ends of the stationary blade 12 are respectively hinged to the outer partition sleeve 11 and the inner partition sleeve 13 via hinges 19, when the stationary blade 12 tilts, the inner partition sleeve... Since 13 is fixed, in order to ensure that the stationary blade 12 can tilt smoothly, the size of the outer partition sleeve 11 will shrink to a certain extent. Therefore, the outer partition sleeve 11 cannot be rigidly connected to the sliding sleeve 10 and the inner cylinder 7. It is elastically connected to the inner cylinder 7 through the return spring 14, which allows the outer partition sleeve 11 to shrink to a certain extent. The sliding sleeve 10 is in contact with the outer partition sleeve 11, which does not affect the outer partition sleeve 11. After the outer partition sleeve 11 moves, the force applied by the sliding sleeve 10 disappears and the outer partition sleeve 11 can return to its original position. As mentioned above, the sliding sleeve 10 is driven by the drive motor 9. The outer wall of the sliding sleeve 10 is provided with helical grooves 16. The output shaft of the drive motor 9 is connected to a gear disk 17, which meshes with the helical grooves 16. Through threaded engagement, when the drive motor 9 drives the gear disk 17 to rotate, the sliding sleeve 10 extends or retracts. Of course, there are many ways to drive the sliding sleeve 10, such as electric push rods or cylinders. The threaded engagement method is chosen here to change the transmission direction because the tilt angle adjustment of the stationary blade 12 is very small, and threaded engagement transmission allows for more precise control. The outer partition sleeve 11 is connected to the end of the outer cylinder 6 via a sealing rubber ring 18. Since the size of the outer partition sleeve 11 may vary, the sealing rubber ring 18 can seal the gap between the outer partition sleeve 11 and the inner cylinder 7, preventing air leakage and affecting the normal operation of the turbine.

[0036] like Figure 1 and Figure 2As shown, a rubber pad 15 is provided at the bottom of the fixed cat claw 3. An installation groove is opened in the rubber pad 15. The first pressure sensor 4 and the second pressure sensor 5 are both fixed in the installation groove. The sensors are installed on the rubber pad 15, which can better measure the pressure value and facilitate the replacement and maintenance of the sensors. There are two of the first pressure sensor 4 and the second pressure sensor 5. The first pressure sensor 4 and the second pressure sensor 5 are used to measure the pressure of the left and right sides of the cylinder block 1 on the fixed cat claw 3, respectively. If the cylinder block 1 is long and only one sensor is set on each side, the measured pressure value is easily inaccurate. Therefore, at least two sensors are used on each side, and the pressure value is more accurate by calculating the average value of the sensors.

[0037] Example 2

[0038] like Figure 5 The diagram shows a flowchart of the adjustment method. This flowchart will now be described in steps. A method for adjusting the instability of a turbine machine, using an anti-instability cylinder device as described in Example 1, includes the following steps:

[0039] Step 1: Real-time acquisition of the pressure values ​​of the first sensor 4 and the second sensor 5, which are recorded as the first pressure value R1 and the second pressure value R2 respectively. The first pressure value R1 and the second pressure value R2 are the pressure values ​​of the left and right sides of the cylinder block 1 on the fixed cat claw 3.

[0040] Step 2: Initiate adjustment detection and calculate whether the pressure difference Δ = |R1-R2| on both sides exceeds 20% of the weight of cylinder block 1. If it does not exceed 20%, the process ends. If it does exceed 20%, a control signal is sent to the control unit. When the pressure difference Δ exceeds 20% of the weight of cylinder block 1, it indicates that the rotational torque currently experienced by cylinder block 1 is large. The weight of cylinder block 1 can be obtained by summing the first pressure value R1 and the second pressure value R2 when the turbine is not working.

[0041] Step 3: The control unit turns on the drive motor 9 to drive the stationary vane 12 to tilt by 1°. Step 2 is executed again. After the stationary vane 12 tilts by 1°, the pressure difference Δ is calculated again to see if it exceeds 20% of the weight of the cylinder block 1. If it still exceeds 20%, the stationary vane 12 is driven to tilt by 1°. In this way, the tilt angle of the stationary vane 12 can be precisely controlled by adjusting the tilt angle by 1° each time, so that neither over-adjustment nor under-adjustment will occur.

[0042] Step four: Check if the turbine is closed. If closed, drive motor 9 rotates in the opposite direction and stationary vane 12 resets. Otherwise, repeat steps two to four. Since the rotational torque on cylinder 1 is different each time the turbine is used, the rotational torque on cylinder 1 may be larger in the previous use and smaller in the next use. Therefore, resetting stationary vane 12 when the turbine is closed facilitates the next use and does not affect the normal operation of the turbine.

[0043] The method also includes setting at least two first sensors 4 and second sensors 5, and calculating the first pressure value R1 and the second pressure value R2 as average pressure values. If at least two first sensors 4 and second sensors 5 are set, the first pressure value R1 and the second pressure value R2 calculated in step one are the average values ​​of the sensors.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stall-prevention cylinder device of a turbomachinery, comprising a cylinder body (1), a cat paw (3) is fixedly installed at the bottom of the cylinder body (1), characterized in that, One end of the cylinder block (1) has a through hole, and an adjustable air inlet (2) for airflow to enter the cylinder block (1) is installed in the through hole. A first pressure sensor (4) and a second pressure sensor (5) are respectively installed on the bottom sides of the fixed cat claw (3) to detect the side pressure of the cylinder block (1). The adjustable air inlet (2) includes an outer partition sleeve (11) and an inner partition sleeve (13), which are also annular structures. The outer partition sleeve (11) and the inner partition sleeve (13) are connected by a number of circumferentially distributed stationary blades (12). The stationary blades (12) are tilted by a drive motor (9) to adjust the rotational torque on the adjustable air inlet (2). The drive motor (9) is provided with a control signal by a control unit. The control unit receives the signal input from the first pressure sensor (4) and the second pressure sensor (5). The cylinder block (1) It includes an outer cylinder (6) and an inner cylinder (7), which are spaced apart and connected by reinforcing ribs (8). A drive motor (9) is installed in the gap between the outer cylinder (6) and the inner cylinder (7). The two ends of the stationary blade (12) are respectively hinged to the outer partition sleeve (11) and the inner partition sleeve (13) by hinges (19). The inner partition sleeve (13) is fixedly installed, and the outer partition sleeve (11) is movably installed. The outer partition sleeve (11) is moved by the drive motor (9) to adjust the tilt angle of the stationary blade (12). The outer partition... The sleeve (11) is installed at the end of the inner cylinder (7) by a return spring (14). The outer wall of the inner cylinder (7) is fitted with a sliding sleeve (10). One end of the sliding sleeve (10) is in contact with the outer partition sleeve (11), and the other end is connected to the drive motor (9). The outer partition sleeve (11) is moved by the sliding sleeve (10) driven by the drive motor (9). The outer wall of the sliding sleeve (10) is provided with a helical tooth groove (16). The output shaft of the drive motor (9) is connected to a gear disk (17), and the gear disk (17) meshes with the helical tooth groove (16).

2. A stall-preventing cylinder device for turbomachinery according to claim 1, characterized in that The outer partition sleeve (11) is connected to the end of the outer cylinder (6) by a sealing ring (18).

3. A stall-preventing cylinder device for turbomachinery according to claim 1, characterized in that, A rubber pad (15) is provided at the bottom of the fixed cat paw (3), and an installation groove is opened in the rubber pad (15). The first pressure sensor (4) and the second pressure sensor (5) are both fixed in the installation groove.

4. The anti-instability cylinder device for turbine machinery according to claim 1, characterized in that, Two pressure sensors are provided for both the first pressure sensor (4) and the second pressure sensor (5).

5. A method for adjusting the instability of a turbine machine, using the anti-instability cylinder device according to any one of claims 1-4, characterized in that, The method includes the following steps: Step 1: Real-time acquisition of the pressure values ​​of the first sensor (4) and the second sensor (5), which are recorded as the first pressure value R1 and the second pressure value R2, respectively; Step 2: Start the adjustment detection and calculate whether the pressure difference Δ=|R1-R2| on both sides exceeds 20% of the weight of the cylinder block (1). If it does not exceed, then end; if it does, send a control signal to the control unit. Step 3: The control unit turns on the drive motor (9) to drive the stationary blade (12) to tilt by 1°, and then executes step 2 again; Step 4: Check if the turbine is closed. If closed, drive motor (9) rotates in the opposite direction and stationary blade (12) resets. Otherwise, repeat steps 2 to 4.

6. The method for adjusting the instability of a turbine machine according to claim 5, characterized in that, The method also includes setting at least two first sensors (4) and second sensors (5), and the calculated first pressure value R1 and second pressure value R2 are both average pressure values.

Images