Guide vane adjustment mechanism and expander

Abstract

The present invention provides a guide vane adjustment mechanism and an expander. The guide vane adjustment mechanism includes a power source, a first transmission member, a second transmission member, a third transmission member, a fourth transmission member, and a plurality of guide vanes, which are connected in sequence. The power source drives the first transmission member, which in turn brakes the guide vanes via the second, third, and fourth transmission members, thereby causing all the guide vanes to rotate and converge or spread. The expander includes the guide vane adjustment mechanism. The guide vane adjustment mechanism and expander provided by the present invention achieve precise and effective adjustment of the guide vanes.

Description

Technical Field

[0001] The present invention relates to the technical field of expanders, and in particular to a guide vane adjustment mechanism and an expander. Background Art

[0002] Currently, radial turbine expanders are designed with adjustable guide vane mechanisms to appropriately adjust the installation angle of the expander's inlet guide vanes under varying operating conditions, thereby improving the gas velocity triangle at the impeller inlet, thereby reducing gas flow losses within the flow channel and significantly improving the efficiency of the main engine under varying operating conditions. However, most existing adjustable guide vane mechanisms use pneumatic or electric actuators to drive the guide rod in linear reciprocating motion, and then convert the linear reciprocating motion into guide vane rotational motion through a series of transmission elements. Their main drawbacks are: 1. The driving force required for the guide rod movement is directly provided by the actuator, which requires a high driving force from the drive source; 2. Due to the limited space inside the expander casing, the guide rod's linear reciprocating motion stroke is relatively small, resulting in low inlet guide vane adjustment accuracy.

[0003] Therefore, how to solve the above-mentioned problems of low adjustment accuracy of the existing guide vane adjustment mechanism and high driving force requirements of the driving source needs to be studied urgently. Summary of the Invention

[0004] The object of the present invention is to provide a guide vane adjustment mechanism and an expander to achieve accurate and effective adjustment of the guide vanes.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A guide vane adjustment mechanism is provided in an expander, the guide vane adjustment mechanism comprising:

[0007] a power source, fixedly connected to the expander;

[0008] A first transmission member, connected to and driven by the power source to rotate;

[0009] a second transmission member, sleeved on and driven by the first transmission member, and moving along the axial direction of the first transmission member;

[0010] a third transmission member having a first end, a second end, and a third end connected to each other, the first end being hingedly connected to the second transmission member, and the second end being hingedly connected to the expander;

[0011] a fourth transmission member, comprising a branch portion and a main body connected to each other, the branch portion being hingedly connected to the third end, and a plurality of first limiting posts being distributed in an annular manner on one surface of the main body;

[0012] Multiple guide vanes have a first waist-shaped hole at one end and a second limiting column at the other end. One of the first limiting columns passes through the first waist-shaped hole of each guide vane. Each guide vane is hingedly connected to the expander via the second limiting column. Each guide vane rotates to gather or disperse.

[0013] In some embodiments of the present invention, the power source is a servo motor or a stepper motor;

[0014] A shaft of one of the servo motor or the stepper motor is coaxially connected to the first transmission member.

[0015] In some embodiments of the present invention, a first spiral groove is provided on the outer circumferential surface of the first transmission member, and the first spiral groove extends spirally with the axial direction of the first transmission member as the rotation axis;

[0016] The second transmission member is provided with a through hole, and the first transmission member passes through the second transmission member;

[0017] A second spiral groove is formed on the inner wall of the through hole. The first spiral groove and the second spiral groove have the same rotation direction and size and are matched with each other.

[0018] In some embodiments of the present invention, the first spiral groove and the second spiral groove both have a cross-section in the shape of a gear tooth profile;

[0019] The first spiral groove is spirally wound to form a first spiral rib, the second spiral groove is spirally wound to form a second spiral rib, the first spiral rib extends into the second spiral groove, and the second spiral rib extends into the first spiral groove.

[0020] In some embodiments of the present invention, the first spiral groove and the second spiral groove both have a semicircular cross-section and together enclose a spiral cavity, wherein the spiral cavity is in the shape of a spirally extending column;

[0021] A plurality of balls are arranged in the spiral cavity, and all the balls roll in the spiral cavity.

[0022] In some embodiments of the present invention, a third limiting column is protruding from the outer circumference of the second transmission member, and a first through hole is formed on the first end of the third transmission member;

[0023] The third limiting column passes through the first through hole.

[0024] In some embodiments of the present invention, a waist-shaped notch or a second waist-shaped hole is provided on the third end of the third transmission member, and a second through hole is provided on the branch portion of the fourth transmission member;

[0025] A pin is provided between one of the waist-shaped notch or the second waist-shaped hole and the second through hole.

[0026] In some embodiments of the present invention, the main body of the fourth transmission member is annular, and all of the first limiting columns are arranged around the central axis of the main body.

[0027] In some embodiments of the present invention, the orthographic projection shape of the guide vane is an aerodynamic shape and includes a head portion and a tail portion connected to each other;

[0028] The orthographic projection shape of the head is approximately circular, and the orthographic projection shape of the tail is approximately triangular;

[0029] The first waist-shaped hole is provided on the head portion, and the second limiting column is provided on the tail portion.

[0030] In some embodiments of the present invention, the guide vane adjustment mechanism further includes a bearing;

[0031] The bearing is fixedly connected to the expander and is rotatably connected to an end of the first transmission member that is away from the power source.

[0032] In order to achieve the above object, the present invention also provides the following technical solutions:

[0033] An expander comprises the guide vane adjustment mechanism described above.

[0034] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0035] 1. The guide vane adjustment mechanism and expander provided by the present invention realize driving and controlling each guide vane to rotate and translate to a certain extent, thereby bringing the guide vanes together or apart, by sequentially connecting a power source, a first transmission member, a second transmission member, a third transmission member, a fourth transmission member, and a plurality of guide vanes. Specifically, the power source drives the first transmission member to rotate, the first transmission member drives the second transmission member to perform linear reciprocating motion, the second transmission member drives the third transmission member to rotate, and the third transmission member then drives the fourth transmission member to rotate, ultimately driving the guide vanes to rotate in the same direction and translate to a certain extent, so that the guide vanes gather or disperse, thereby realizing precise and effective adjustment of the guide vanes.

[0036] 2. The guide vane adjustment mechanism and expander provided by the present invention adopt a servo motor or a stepper motor as a power source and provide a rotational torque output, thereby driving the first transmission member to rotate, and then driving the second transmission member to perform linear reciprocating motion along the axial direction of the first transmission member, so that the third transmission member rotates, and then the fourth transmission member rotates around the branch, so that each guide vane rotates and translates and then gathers or disperses, so as to achieve adjustment and control of the opening and closing state of the guide vane; and, compared with the solution in the prior art that uses a series of transmission members to convert linear reciprocating motion into rotational motion of the guide vane, the adjustment method adopted by the present invention has the advantages of high adjustment accuracy and smaller load requirements on the power source.

[0037] 3. In some embodiments of the present invention, the expander may be a radial turbine expander; specifically, the guide vane adjustment mechanism may be arranged at the inlet of the radial turbine expander to adjust the guide vane installation angle at the expander inlet under variable operating conditions, thereby improving the parameters of the gas velocity triangle at the impeller inlet, thereby reducing the loss of airflow energy in the flow channel, and significantly improving the operating efficiency of the expander under variable operating conditions.

[0038] 4. The guide vane adjustment mechanism and expander provided by the present invention adopt a first transmission member with spiral grooves and spiral ridges on the outer peripheral surface, and a second transmission member with corresponding spiral grooves and spiral ridges on the inner wall of the through hole. The two cooperate with each other to achieve the effect of "the first transmission member rotating around its own axis and driving the second transmission member sleeved on the outer periphery of the first transmission member to perform linear reciprocating motion along the axis of the first transmission member". This transmission method has the advantages of high efficiency and reliability, and improves the reliability of the entire guide vane adjustment mechanism.

[0039] 5. The guide vane adjustment mechanism and expander provided by the present invention achieve a labor-saving and reliable transmission effect from the first transmission member to the second transmission member through the cooperation of a first transmission member having a spiral groove with a semicircular cross-section on the outer peripheral surface, a second transmission member having a spiral groove with a semicircular cross-section on the inner wall surface of the through hole, and a plurality of balls arranged in the spiral cavity, further reducing the load requirements for the power source and also meeting the accuracy requirements for the guide vane adjustment.

[0040] 6. The guide vane adjustment mechanism and the first transmission member in the expander provided by the present invention are supported by a bearing at one end away from the power source, thereby improving the rigidity of the first transmission member, avoiding the safety hazards caused by large deflection deformation during operation, improving the accuracy of the transmission process of the entire adjustment mechanism, reducing the wear caused by motion deviation, thereby extending the service life of the entire workpiece, and also improving production efficiency due to the reduced maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A schematic structural diagram of a guide vane adjustment mechanism provided in one embodiment of the present invention at a first viewing angle;

[0043] Figure 2 for Figure 1 A schematic structural diagram of the guide vane adjustment mechanism in a second viewing angle;

[0044] Figure 3 for Figure 1 A schematic structural diagram of the guide vane adjustment mechanism in FIG. 1 from a third perspective;

[0045] Figure 4 for Figure 1 A schematic structural diagram of the second transmission member in FIG.

[0046] Figure 5 for Figure 1 A schematic structural diagram of the third transmission member in FIG.

[0047] Figure 6 for Figure 1 A schematic structural diagram of the fourth transmission member in FIG;

[0048] Figure 7 for Figure 1 Schematic diagram of the structure of the guide vane.

[0049] The main reference numerals in the drawings of the present specification are described as follows:

[0050] 1-Power source;

[0051] 2-first transmission member;

[0052] 3-second transmission member; 31-through hole; 311-second spiral groove; 32-limiting column;

[0053] 4-third transmission member; 41-first end; 411-first through hole; 42-second end; 43-third end; 431-waist-shaped notch;

[0054] 5-fourth transmission member; 51-branch; 511-second through hole; 52-main body; 521-first limiting column;

[0055] 6- guide vane; 61- first waist-shaped hole; 62- second limiting column; 63- head; 64- tail;

[0056] 7-Expander;

[0057] 8-Bearings. DETAILED DESCRIPTION

[0058] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0059] The technical solutions of the present invention provide a guide vane adjustment mechanism and an expander, each of which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of the present invention. Furthermore, the descriptions of each embodiment below have their own specific focus. For details not provided in one embodiment, please refer to the relevant descriptions of other embodiments.

[0060] Example 1

[0061] like Figure 1 and Figure 2As shown, in some embodiments of the present invention, a guide vane adjustment mechanism is provided in an expander 7, wherein the guide vane adjustment mechanism comprises: a power source 1 fixedly connected to the expander 7; a first transmission member 2 connected to and driven by the power source 1 to rotate; a second transmission member 3 sleeved on and driven by the first transmission member 2, and moving along the axial direction of the first transmission member 2; a third transmission member 4 having a first end 41, a second end 42 and a third end 43 connected to each other, the first end 41 being hingedly connected to the second transmission member 3, and the second end 42 being hingedly connected to the expander 7 Branch connection; the fourth transmission member 5 has a connected branch 51 and a main body 52, the branch 51 is hingedly connected to the third end 43 of the third transmission member 4, and a plurality of first limiting columns 521 are distributed in a ring shape on one surface of the main body 52; a plurality of guide vanes 6, one end of which is provided with a first waist-shaped hole 61, and the other end of which is provided with a second limiting column 62, and the first waist-shaped hole 61 of each guide vane 6 passes through one of the first limiting columns 521 respectively, and each guide vane 6 is hingedly connected to the expander 7 via the second limiting column 62, and each guide vane rotates to gather or disperse. Specifically, by sequentially connecting the power source 1, the first transmission member 2, the second transmission member 3, the third transmission member 4, the fourth transmission member 5 and the plurality of guide vanes 6, it is possible to drive and control the rotation of each guide vane 6, so that the guide vanes 6 gather together or disperse with each other; specifically, the power source 1 drives the first transmission member 2 to rotate, the first transmission member 2 drives the second transmission member 3 to perform linear reciprocating motion, the second transmission member 3 drives the third transmission member 4 to rotate, and the third transmission member 4 then drives the fourth transmission member 5 to rotate, and finally drives the guide vanes 6 to rotate in the same direction, so that the guide vanes 6 gather together or disperse with each other, thereby achieving precise and effective adjustment of the guide vanes 6.

[0062] It is worth noting that, in some embodiments of the present invention, the expander 7 may be a radial turbine expander; specifically, the guide vane adjustment mechanism may be arranged at the inlet position of the radial turbine expander to adjust the guide vane installation angle at the expander inlet under variable operating conditions, thereby improving the parameters of the gas velocity triangle at the impeller inlet, thereby reducing the loss of airflow energy in the flow channel, and greatly improving the operating efficiency of the expander under variable operating conditions.

[0063] In some embodiments of the present invention, the power source 1 is a servo motor or a stepper motor; the shaft (unnumbered) of one of the servo motor or stepper motor is coaxially connected to the first transmission member 2. Compared with the prior art solution of using a series of transmission members to convert linear reciprocating motion into the rotational motion of the guide vanes, the guide vane adjustment mechanism provided by the present invention uses a servo motor or a stepper motor as the power source 1 and provides a rotational torque output, thereby driving the first transmission member 2 to rotate, and then driving the second transmission member 3 to perform linear reciprocating motion along the axis of the first transmission member 2, so that the third transmission member 4 rotates, and then the fourth transmission member 5 rotates around the branch 51, thereby causing each guide vane 6 to rotate and gather or spread out, so as to achieve adjustment and control of the opening and closing state of the guide vanes 6.

[0064] like Figure 2 、 Figure 3 and Figure 4 As shown, in some embodiments of the present invention, a first spiral groove is provided on the outer peripheral surface of the first transmission member 2, and the first spiral groove extends spirally with the axial direction of the first transmission member 2 as the rotation axis; a through hole 31 is provided on the second transmission member 3, and the first transmission member 2 passes through the through hole 31; a second spiral groove 311 is provided on the inner wall of the through hole 31, and the first spiral groove and the second spiral groove 311 have the same rotation direction and size, and cooperate with each other to convert the rotational movement of the first transmission member 2 around its own axial direction into the linear reciprocating motion of the second transmission member 3.

[0065] In some embodiments of the present invention, both the first spiral groove and the second spiral groove 311 have a cross-section in the shape of a gear tooth profile, the first spiral groove is spirally wound to form a first spiral ridge, the second spiral groove 311 is spirally wound to form a second spiral ridge, the first spiral ridge extends into the second spiral groove 311, and the second spiral ridge extends into the first spiral groove. It can be understood that the above-mentioned transmission structure realizes the effect of "the first transmission member rotates around its own axis and drives the second transmission member sleeved on the outer periphery of the first transmission member to perform linear reciprocating motion along the axis of the first transmission member", and this transmission method has the advantages of high efficiency and reliability, thereby improving the reliability of the entire guide vane adjustment mechanism. Specifically, in some embodiments of the present invention, the first transmission member 2 can be a worm, and the model, specifications and parameters of the worm can be adjusted according to actual needs.

[0066] refer to Figure 4In some embodiments of the present invention, the first spiral groove and the second spiral groove 311 both have a semicircular cross-section, and together enclose a spiral cavity, and the spiral cavity is a spirally extended column; a plurality of balls (not shown) are provided in the spiral cavity, and all of the balls roll in the spiral cavity. In some embodiments of the present invention, the first transmission member 2 can be a ball screw, and the second transmission member 3 can be a ball seat. The specific specifications and models of the ball screw and ball seat can be selected and adjusted according to actual needs. Specifically, by the cooperation of the first transmission member 2 having a spiral groove with a semicircular cross-section on the outer circumference, the second transmission member 3 having a spiral groove with a semicircular cross-section on the inner wall of the through hole, and the plurality of balls provided in the spiral cavity, a labor-saving and reliable transmission effect from the first transmission member 2 to the second transmission member 3 is achieved, which further reduces the load requirements for the power source 1 and can also meet the accuracy requirements for the guide vane adjustment.

[0067] In some embodiments of the present invention, the expander 7 may be an expander; more specifically, a radial turbine expander. It is understood that the present invention incorporates the aforementioned ball screw structure into an expander with inlet guide vane adjustment, achieving micro-feeding of the ball seat through the rotation of the screw, thereby greatly improving the guide vane adjustment accuracy.

[0068] It is worth noting that in the prior art, related guide vane adjustment solutions all use a drive source that performs linear reciprocating motion. In order to provide sufficient driving force for the corresponding load, namely the guide vanes, the expander must meet high thrust and high precision requirements, resulting in higher technical requirements and high cost for the expander. The present invention, on the other hand, uses a power source 1 that performs rotary motion, combined with the aforementioned ball screw structure, to significantly reduce torque requirements. Conventional servo motors or stepper motors can also be used for drive, thereby significantly reducing the load requirements for the power source 1.

[0069] like Figure 4 As shown, in some embodiments of the present invention, a third limiting post 32 is protruding from the outer circumference of the second transmission member 3, and a first through-hole 411 is defined on the first end 41 of the third transmission member 4; the third limiting post 32 passes through the first through-hole 411. It is understood that this arrangement can make the coordination between the various components of the guide vane adjustment mechanism more efficient, compact, and reasonable, and the service performance of each component also has the advantages of high efficiency, reliability, and good stability.

[0070] like Figure 5As shown, in some embodiments of the present invention, a waist-shaped notch 431 is provided on the third end 43 of the third transmission member 4, and a second through hole 511 is provided on the branch 51 of the fourth transmission member 5; a pin (not numbered) is passed through the waist-shaped notch 431 and the second through hole 511. It is understood that the function of the above-mentioned pin is to convert the rotation of the third transmission member 4 into the rotation of the fourth transmission member 5; the function of the above-mentioned waist-shaped notch 431 is to allow the pin to undergo a certain degree of translation in the waist-shaped notch 431 to coordinate the rotational relationship between the third transmission member 4 and the fourth transmission member 5. In other embodiments of the present invention, a second waist-shaped hole (not shown) can be used to replace the above-mentioned waist-shaped notch 431 in an equivalent manner, which can also achieve the effect of equally coordinating the rotational relationship between the third transmission member 4 and the fourth transmission member 5. It is understood that the specific size parameters of the above-mentioned waist-shaped notch 431, the second waist-shaped hole and the pin can be selected and adjusted according to actual conditions.

[0071] like Figure 6 As shown, in some embodiments of the present invention, the main body 52 of the fourth transmission member 5 is annular, and all of the first limiting posts 521 are arranged around the central axis of the main body 52 to adapt to the expander 7 described above. The specific shape and size of the main body 52 can be adjusted and designed according to the type and size of the expander 7 actually used. In some embodiments of the present invention, the expander 7 is a radial turbine expander, and the guide vane adjustment mechanism is installed at the inlet of the turbine expander.

[0072] like Figure 7 As shown, in some embodiments of the present invention, the orthographic projection of the guide vane 6 is an aerodynamic shape and includes a head 63 and a tail 64 connected to each other; the orthographic projection of the head 63 is generally circular, and the orthographic projection of the tail 64 is generally triangular; the first waist-shaped hole 61 is provided on the head 63, and the second limiting post 62 is provided on the tail 64; the above design enables the guide vanes 6 to be gathered together and enclosed to form a large circle through the entire guide vane adjustment mechanism provided by the present invention, or to be adjusted so that each guide vane 6 rotates and disperses after adjustment, thereby adjusting the guide vanes 6. In some embodiments of the present invention, the expander 7 can be a radial turbine expander; specifically, the guide vane adjustment mechanism can be provided at the inlet of the radial turbine expander to adjust the guide vane installation angle at the expander inlet under variable operating conditions, thereby improving the parameters of the gas velocity triangle at the impeller inlet, thereby reducing the loss of airflow energy in the flow channel, and significantly improving the operating efficiency of the expander under variable operating conditions.

[0073] like Figure 7 As shown, in some embodiments of the present invention, the orthographic projection shape of the guide vane 6 is spoon-shaped or Sinan-shaped, and the shape of the guide vane 6 can also be adjusted and designed according to actual conditions.

[0074] like Figure 3 As shown, in some embodiments of the present invention, the guide vane adjustment mechanism further includes a bearing 8; the bearing 8 is fixedly connected to the expander 7 and rotatably connected to the end of the first transmission member 2 facing away from the power source 1. It will be appreciated that the cooperation between the bearing 8 and the first transmission member 2 improves the rigidity of the first transmission member 2, avoids the safety hazards caused by large deflection during operation, improves the accuracy of the transmission process of the entire adjustment mechanism, reduces wear caused by motion deviation, thereby extending the service life of the entire workpiece, and also improves production efficiency due to reduced maintenance frequency.

[0075] Example 2

[0076] An expander includes the guide vane adjustment mechanism described in Example 1; specifically, the expander may be a radial turbine expander. It is understood that the expander utilizes the guide vane adjustment mechanism, thereby achieving high-precision guide vane adjustment and labor-saving effects. Furthermore, the structural design of the guide vane adjustment mechanism is highly efficient, compact, and reliable, making the overall structural design of the expander even more efficient, compact, and reliable.

[0077] The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims. In addition, the principle and implementation of the present invention are explained in detail in the specification using specific examples. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. The content of this specification should not be understood as limiting the present invention.

Claims

1. A guide vane adjustment mechanism, for use in an expander, characterized in that: The guide vane adjustment mechanism comprises: a power source, fixedly connected to the expander; A first transmission member, connected to and driven by the power source to rotate; a second transmission member, sleeved on and driven by the first transmission member, and moving along the axial direction of the first transmission member; a third transmission member having a first end, a second end, and a third end connected to each other, the first end being hingedly connected to the second transmission member, and the second end being hingedly connected to the expander; a fourth transmission member, comprising a branch portion and a main body connected to each other, the branch portion being hingedly connected to the third end, and a plurality of first limiting posts being distributed in an annular manner on one surface of the main body; A plurality of guide vanes, each having a first waist-shaped hole at one end and a second limiting post at the other end, wherein one of the first limiting posts passes through the first waist-shaped hole of each guide vane, and each guide vane is hingedly connected to the expander via the second limiting post, so that each guide vane gathers or spreads when it rotates; A bearing is fixedly connected to the expander and is rotatably connected to an end of the first transmission member that is away from the power source.

2. The guide vane adjustment mechanism according to claim 1, characterized in that: The power source is a servo motor or a stepper motor; A shaft of one of the servo motor or the stepper motor is coaxially connected to the first transmission member.

3. The guide vane adjustment mechanism according to claim 1, characterized in that: A first spiral groove is provided on the outer circumference of the first transmission member, and the first spiral groove extends spirally with the axial direction of the first transmission member as the rotation axis; The second transmission member is provided with a through hole, and the first transmission member passes through the second transmission member; A second spiral groove is formed on the inner wall of the through hole. The first spiral groove and the second spiral groove have the same rotation direction and size and are matched with each other.

4. The guide vane adjustment mechanism according to claim 3, characterized in that: The first spiral groove and the second spiral groove both have a cross section in the shape of a gear tooth profile; The first spiral groove is spirally wound to form a first spiral rib, the second spiral groove is spirally wound to form a second spiral rib, the first spiral rib extends into the second spiral groove, and the second spiral rib extends into the first spiral groove.

5. The guide vane adjustment mechanism according to claim 3, characterized in that: The first spiral groove and the second spiral groove both have a semicircular cross-section and together enclose a spiral cavity, and the spiral cavity is a spirally extending column; A plurality of balls are arranged in the spiral cavity, and all the balls roll in the spiral cavity.

6. The guide vane adjustment mechanism according to claim 1, characterized in that: A third limiting column is protruding from the outer circumferential surface of the second transmission member, and a first through hole is formed on the first end of the third transmission member; The third limiting column passes through the first through hole.

7. The guide vane adjustment mechanism according to claim 1, characterized in that: A waist-shaped notch or a second waist-shaped hole is provided on the third end of the third transmission member, and a second through hole is provided on the branch portion of the fourth transmission member; A pin is provided between one of the waist-shaped notch or the second waist-shaped hole and the second through hole.

8. The guide vane adjustment mechanism according to claim 1, characterized in that: The main body of the fourth transmission member is annular, and all the first limiting columns are arranged around the central axis of the main body.

9. The guide vane adjustment mechanism according to claim 1, characterized in that: The guide vane has an orthographic projection shape that is an aerodynamic shape and includes a head portion and a tail portion that are connected; The orthographic projection shape of the head is approximately circular, and the orthographic projection shape of the tail is approximately triangular; The first waist-shaped hole is provided on the head portion, and the second limiting column is provided on the tail portion.

10. An expander, characterized in that: The expander includes the guide vane adjustment mechanism according to any one of claims 1 to 9.

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