Inlet rotatable guide vane mechanism of expansion machine

Abstract

An inlet rotatable guide vane mechanism of an expansion machine aims at solving the problems that a traditional inlet rotatable guide vane mechanism is complex in structure, high in failure rate, tedious in control and complex in disassembly and assembly operation and comprises a swing driving assembly, a flow guide cover, a rotating ring, an expansion machine volute, a pressing plate, a plurality of rollers and a plurality of guide vanes. One end of the expansion machine volute is installed on the flow guide cover, the expansion machine volute is arranged in the rotating ring in a rolling mode through the rollers, the pressing plate is opposite to the flow guide cover and the rotating ring, the guide vanes are evenly distributed between the pressing plate and the flow guide cover and between the pressing plate and the rotating ring in the radial direction, and the swing driving assembly is installed on the outer circle face of the rotating ring. The swing driving assembly drives the guide vane to swing among the pressing plate, the flow guide cover and the rotating ring. The inlet rotating guide vane is applied to the field of inlet rotating guide vanes of small and medium-sized turbo expanders.

Description

Technical Field

[0001] The invention relates to an expander inlet rotatable guide vane mechanism, in particular to an expander inlet rotatable guide vane mechanism. The invention is applied to the field of inlet rotatable guide vanes of small and medium-sized turbine expanders. Background Art

[0002] The turbine expander uses compressed gas under high pressure to enter the expander, driving the impeller to rotate and output expansion work. High-pressure gas enters the expander volute from the air inlet, enters the working impeller through the inlet guide vane channel and performs mechanical work, and then the gas is discharged through the expansion chamber and the air outlet. Expander flow regulation is one of the most critical technologies of the expander. The regulation of the expander inlet flow rate relies on an actuator to drive the nozzle blades to rotate and change the channel cross-sectional area to achieve operation in a wide load range; it plays a role in preventing surge during low-speed processes such as starting and stopping the unit; in the event of an accident in the unit, this mechanism can also be controlled to close the air inlet in an emergency.

[0003] US Patent No. 4850795 adopts double-row blades, with low consistency in the inlet area and high consistency in the outlet area. This structure limits the working area and is not conducive to the requirements of variable working conditions.

[0004] US Patent No. 3756739 adopts a method of designing a small blade at the end of a long blade to control the working condition adjustment, the adjustment range is relatively narrow, and the control mechanism is relatively complex;

[0005] Chinese patent 00204860.4 proposes a diffuser with inner and outer rings rotating. This structure divides the diffuser blades into two. The structure is simple, but since the blades on the rotating ring are staggered, the flow structure will be changed, resulting in a large flow loss, and the flow cannot be actively adjusted.

[0006] The traditional imported rotatable guide vane mechanism has a complex structure, high failure rate, cumbersome control, and complex disassembly and assembly operations. Therefore, we propose a simple imported rotatable guide vane mechanism to solve the above technical problems. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of complex structure, high failure rate, cumbersome control and complicated disassembly and assembly of the traditional inlet guide vane mechanism, and further provide an expander inlet guide vane mechanism.

[0008] The technical solution adopted by the present invention to solve the above problems is:

[0009] An expander inlet rotatable guide vane mechanism comprises a swing drive assembly, a guide cover, a swivel, an expander volute, a pressure plate, a plurality of rollers and a plurality of guide vanes;

[0010] One end of the expander volute is installed on the guide cover, and the expander volute is rollingly arranged in the swivel through multiple rollers. The pressure plate is arranged opposite to the guide cover and the swivel, and multiple guide vanes are evenly distributed radially between the pressure plate, the guide cover and the swivel. The swing drive assembly is installed on the outer cylindrical surface of the swivel, and the swing drive assembly drives the guide vane to swing between the pressure plate, the guide cover and the swivel.

[0011] Further, the swing drive assembly includes a connecting rod and a pull rod;

[0012] One end of the connecting rod is fixedly connected to the outer side wall of the rotating ring, one end of the pulling rod is rotatably connected to the other end of the connecting rod, and the other end of the pulling rod is connected to the external driving end.

[0013] Further, it also includes a pin shaft and a split pin;

[0014] One end of the pull rod is processed with a notch, the other end of the connecting rod is installed in the notch of the pull rod, and the pin shaft is inserted on the side walls of the notches on the connecting rod and the pull rod, and the cotter pin is installed on the pin shaft, and the pin shaft is locked on the pull rod through the cotter pin.

[0015] Further, it includes a plurality of pins,

[0016] The guide vane is arranged between the pressure plate, the guide cover and the swivel through two pins. A circular hole is processed near the middle of the guide vane, and a strip hole is processed at one end of the guide vane close to the back of the blade. A pin is arranged in the circular hole, and the two ends of the pin are respectively arranged on the guide cover and the pressure plate. The guide vane rotates around the pin. A pin is arranged in the strip hole, and the two ends of the pin are respectively arranged on the swivel and the pressure plate, and the pin slides in the strip hole.

[0017] Further, it includes a plurality of bolts;

[0018] One end of the expander volute is fixedly connected to the guide cover through a plurality of bolts.

[0019] Furthermore, the inner circular surface of the air guide cover is connected to the end surface of the air guide cover through an arc transition, and the arc surface of the air guide cover is matched with the profile of the impeller end surface.

[0020] Furthermore, the contact end surface between the guide vane and the pressure plate is a stepped structure.

[0021] Beneficial effects of the present invention:

[0022] 1. The structure of the present invention is a part of a turbo expander and provides a new method for the development of a turbo expander.

[0023] 2. The present invention has a simple structure, reduces the failure rate, is convenient to operate, and is easy to disassemble and repair, which greatly reduces the time and material cost of processing and manufacturing.

[0024] 3. The structure of the present invention has reliable transmission, light structure and rapid execution response.

[0025] 4. The structure of the invention can adjust the intake flow rate over a wide range, expand the working range of the expander, and improve the utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of this application.

[0027] Figure 2 This is a schematic diagram of the overall structure of this application before installation.

[0028] Figure 3 Side view of the overall structure of this application, the arrow direction is the air intake direction.

[0029] Figure 4 for Figure 2 Center AA view.

[0030] Figure 5 This is a schematic diagram showing that the guide vane 1 is arranged between the pressure plate 11, the guide cover 6 and the swivel ring 9.

[0031] Figure 6 Schematic diagram of connecting connecting rod 2 and pulling rod 3 by pin shaft 7 and cotter pin 8.

[0032] Figure 7 Schematic diagram of the swing of guide vane 1.

[0033] Figure 8 Schematic diagram of the expander inlet variable guide vane mechanism.

[0034] Fig. 9 Schematic diagram of the actuator displacement of the expander inlet guide vane mechanism corresponding to the nozzle throat width. DETAILED DESCRIPTION

[0035] Specific implementation method 1: Combination Figure 1-Figure 8 The present embodiment is described. The present embodiment describes an expander inlet rotatable guide vane mechanism, which comprises a swing drive assembly, a guide cover 6, a swivel 9, an expander volute 10, a pressure plate 11, a plurality of rollers 4 and a plurality of guide vanes 1;

[0036] One end of the expander volute 10 is installed on the guide cover 6, and the expander volute 10 is rollingly set in the swivel 9 through multiple rollers 4. The pressure plate 11 is arranged opposite to the guide cover 6 and the swivel 9. Multiple guide vanes 1 are evenly distributed radially between the pressure plate 11, the guide cover 6 and the swivel 9. The swing drive assembly is installed on the outer cylindrical surface of the swivel 9, and the swing drive assembly drives the guide vane 1 to swing between the pressure plate 11, the guide cover 6 and the swivel 9.

[0037] Specific implementation method 2: Combination Figure 1-Figure 4This embodiment is described. In this embodiment, an expander inlet rotatable guide vane mechanism, a swing drive assembly includes a connecting rod 2 and a pull rod 3;

[0038] One end of the connecting rod 2 is fixedly connected to the outer side wall of the rotating ring 9, one end of the pull rod 3 is rotatably connected to the other end of the connecting rod 2, and the other end of the pull rod 3 is connected to the external driving end. Other methods are the same as the first embodiment.

[0039] Specific implementation method three: Combination Figure 3 and Figure 6 The present embodiment is described as follows. The expander inlet rotatable guide vane mechanism described in the present embodiment further comprises a pin shaft 7 and a cotter pin 8;

[0040] One end of the pull rod 3 is processed with a notch, the other end of the connecting rod 2 is installed in the notch of the pull rod 3, and the pin 7 is inserted on the side walls of the notches on the connecting rod 2 and the pull rod 3, and the split pin 8 is installed on the pin 7, and the pin 7 is locked on the pull rod 3 by the split pin 8. Other methods are the same as the second specific implementation method.

[0041] Specific implementation method four: Combination Figure 1-Figure 5 The present embodiment is described as follows. The expander inlet rotatable guide vane mechanism described in the present embodiment further comprises a plurality of pins 5.

[0042] The guide vane 1 is arranged between the pressure plate 11 and the guide cover 6 and the swivel 9 through two pins 5. A circular hole is processed near the middle of the guide vane 1, and a strip hole is processed at one end of the guide vane 1 near the back of the blade. A pin 5 is arranged in the circular hole, and the two ends of the pin 5 are respectively arranged on the guide cover 6 and the pressure plate 11. The guide vane 1 rotates around the pin 5. A pin 5 is arranged in the strip hole, and the two ends of the pin 5 are respectively arranged on the swivel 9 and the pressure plate 11, and the pin 5 slides in the strip hole. The external drive end controls the pull rod 3. When the swivel 9 rotates, the guide vane 1 can be swung, thereby controlling the cross-sectional area of ​​the gas channel. The guide vane opening is controlled so that the expander can meet the variable working conditions of pressure and flow rate self-matching. Other methods are the same as the specific implementation method one.

[0043] Specific implementation method five: Combination Figure 1-Figure 4 To explain this embodiment, the expander inlet rotatable guide vane mechanism described in this embodiment further includes a plurality of bolts 12;

[0044] One end of the expander volute 10 is fixedly connected to the air guide cover 6 by a plurality of bolts 12. Other methods are the same as those in the first embodiment.

[0045] Specific implementation method six: Combination Figure 1-Figure 5This embodiment is described. In this embodiment, a rotatable guide vane mechanism for an expander inlet is provided. The inner wall of the swivel 9 is provided with a plurality of arc-shaped grooves. A roller 4 is provided in each arc-shaped groove. The inner wall of the swivel 9 and the outer wall of the expander volute 10 are slidably arranged through the roller 4. The swivel 9 is freely rotated relative to the expander volute 10. Other methods are the same as those in the first embodiment.

[0046] Specific implementation method seven: Combination Figure 1-Figure 5 The present embodiment is described as an expander inlet rotatable guide vane mechanism, wherein the inner circular surface of the guide hood 6 is connected to the end surface of the guide hood 6 by an arc transition, and the arc surface of the guide hood 6 is matched with the profile of the impeller end surface.

[0047] The gap between the arc surface of the air guide cover 6 and the end surface of the impeller is set to L to ensure the expansion efficiency. Other methods are the same as those in the sixth embodiment.

[0048] Specific implementation method eight: Combination Figure 1-Figure 7 The present embodiment is described as follows. In the present embodiment, a rotatable guide vane mechanism at the inlet of an expander is described, and the contact end surface of the guide vane 1 and the pressure plate 11 is a stepped structure.

[0049] A gap is provided between the swinging part of the guide vane 1 and the end surface of the pressure plate 11 to reduce the contact area of ​​the guide vane 1, thereby reducing the friction resistance of the guide vane 1. Other methods are the same as those in the first embodiment.

[0050] like Figure 8 The power source pushes and pulls the slider, and the existence of the frame causes the slider A to slide along a fixed angle, and the slider drives the connecting rod 3 to swing, causing the connecting rod 2 to rotate around the connection point, thereby achieving the purpose of swinging the guide vane 1.

[0051] like Figure 7 When the guide vane 1 is in the fully closed contact state, the tip of the guide vane 1 contacts the back of an adjacent guide vane 1, and the actuator rod is in the initial 0 position.

[0052] When the pull rod 3 moves upward along the expander volute 10, the tip of the guide vane 1 will swing away from the back of the previous guide vane 1, so that the throat width of the guide vane 1 nozzle increases, thereby increasing the cross-sectional area of ​​the gas channel and increasing the air intake at the expander inlet; when the pull rod 3 moves downward along the expander volute 10, the tip of the guide vane 1 will swing toward the back of the previous guide vane 1, and the throat width of the guide vane nozzle decreases until the air intake channel is completely closed, the unit loses its source power, and shuts down.

[0053] The relationship between the moving distance of the pull rod 3 and the throat width of the guide vane 1 nozzle is shown in Table 1 below.

[0054] Table 1

[0055]

[0056] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. An expander inlet rotatable guide vane mechanism, characterized in that: It comprises a swing drive assembly, a guide cover (6), a swivel (9), an expander volute (10), a pressure plate (11), a plurality of rollers (4) and a plurality of guide vanes (1); One end of the expander volute (10) is mounted on a guide cover (6), the expander volute (10) is rollingly arranged in a swivel (9) via a plurality of rollers (4), a pressure plate (11) is arranged opposite to the guide cover (6) and the swivel (9), a plurality of guide vanes (1) are evenly distributed radially between the pressure plate (11), the guide cover (6) and the swivel (9), a swing drive assembly is mounted on an outer circumferential surface of the swivel (9), and the swing drive assembly drives the guide vanes (1) to swing between the pressure plate (11), the guide cover (6) and the swivel (9).

2. The expander inlet rotatable guide vane mechanism according to claim 1, characterized in that: The swing drive assembly comprises a connecting rod (2) and a pull rod (3); One end of the connecting rod (2) is fixedly connected to the outer side wall of the rotating ring (9), one end of the pulling rod (3) is rotatably connected to the other end of the connecting rod (2), and the other end of the pulling rod (3) is connected to the external driving end.

3. The expander inlet rotatable guide vane mechanism according to claim 2, characterized in that: It also includes a pin shaft (7) and a split pin (8); One end of the pull rod (3) is processed with a notch, the other end of the connecting rod (2) is differentially installed in the notch of the pull rod (3), and the pin shaft (7) is inserted into the side walls of the notches on the connecting rod (2) and the pull rod (3), and the split pin (8) is installed on the pin shaft (7), and the pin shaft (7) is locked on the pull rod (3) through the split pin (8).

4. The expander inlet rotatable guide vane mechanism according to claim 1, characterized in that: It also includes a plurality of pins (5), The guide vane (1) is arranged between the pressure plate (11), the guide cover (6) and the rotating ring (9) through two pins (5); a circular hole is processed near the middle of the guide vane (1); a strip hole is processed at one end of the guide vane (1) near the back of the vane; a pin (5) is arranged in the circular hole, and the two ends of the pin (5) are respectively arranged on the guide cover (6) and the pressure plate (11); the guide vane (1) rotates around the pin (5); a pin (5) is arranged in the strip hole, and the two ends of the pin (5) are respectively arranged on the rotating ring (9) and the pressure plate (11); the pin (5) slides in the strip hole.

5. The expander inlet rotatable guide vane mechanism according to claim 1, characterized in that: It also includes a plurality of bolts (12); One end of the expander volute (10) is fixedly connected to the air guide cover (6) via a plurality of bolts (12).

6. The expander inlet rotatable guide vane mechanism according to claim 1, characterized in that: The inner wall of the rotating ring (9) is provided with a plurality of arc-shaped grooves, each of which is provided with a roller (4), and the inner wall of the rotating ring (9) and the outer wall of the expander volute (10) are slidably arranged via the roller (4).

7. The expander inlet rotatable guide vane mechanism according to claim 1, characterized in that: The inner circular surface of the guide cover (6) is connected to the end surface of the guide cover (6) through an arc transition, and the arc surface of the guide cover (6) is matched with the profile line of the impeller end surface.

8. The expander inlet rotatable guide vane mechanism according to claim 1, characterized in that: The contact end surfaces of the guide vane (1) and the pressure plate (11) are of a stepped structure.

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