CN111535920A

CN111535920A - Variable tumble control mechanism

Info

Publication number: CN111535920A
Application number: CN202010473235.8A
Authority: CN
Inventors: 琚雪明; 刘华龙
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-14

Abstract

The disclosure provides a variable tumble control mechanism, and belongs to the field of automobile engines. The variable tumble control mechanism comprises a shell, a flow blocking column, an end cover and a pointer; the shell comprises a first end plate, a second end plate and a plurality of side plates, wherein two opposite side plates in the plurality of side plates are provided with flow guide holes, and the first end plate is provided with an insertion hole; the end cover can be arranged in the jack in a rotating way, and is in movable sealing fit with the jack; the flow blocking column is positioned in the flow guide cavity, one end of the flow blocking column is vertically connected to the end cover, the flow blocking column is coaxial with the end cover, and the end face of the other end of the flow blocking column is in movable sealing fit with the second end plate; the pointer is connected to the end cover. The end covers are rotated to drive the flow blocking columns to rotate, the areas of the communication of the flow guiding holes in the two side plates are changed, so that the air passage tumble can be quickly adjusted, the positions of the flow blocking columns are visually reflected by the pointers, the areas of the communication of the flow guiding holes in the two side plates are conveniently known, and the purpose of quickly matching and optimizing the test scheme of the combustion system is achieved.

Description

Variable tumble control mechanism

Technical Field

The disclosure relates to the field of automobile engines, in particular to a variable tumble control mechanism.

Background

With the increasing environmental problems and the rapid increase of automobile keeping quantity, the relevant regulations for energy conservation and emission reduction of automobiles are more strict.

Compared with the traditional gas passage injection gasoline engine (PFI), the direct injection gasoline engine (GDI) can control the oil injection more accurately, and the compression ratio is higher. The engine speed reduction device is combined with a supercharging technology, and matched with a strategy of miniaturization (Down-Sizing) and engine speed reduction (Down-Sizing), so that the engine speed reduction device has the advantages of good dynamic property, economy and relatively low cost, and the current related technology is mature day by day and has mass production conditions, and becomes the main development direction of a gasoline engine.

The mainstream direct injection gasoline engine is all that the sprayer is put to the side, to this type of direct injection gasoline engine, the design of intake duct is especially important, needs the intake duct to provide stronger intake tumble and strengthens the guide to the spraying to prevent that the oil beam from hitting the wall, promote the oil-gas mixture, consequently need carry out meticulous optimization matching design to intake duct and combustion chamber, guarantee that the intake duct can both provide strong enough tumble under various operating modes, simultaneously not lose again and admit air.

In the related technology, different tumble ratio schemes need to be manufactured for thermodynamic development and verification, and then a proper tumble ratio air passage scheme can be determined, so that the development cost is increased, and the development period is prolonged.

Disclosure of Invention

The embodiment of the disclosure provides a variable tumble control mechanism, which can conveniently control the tumble ratio of an air inlet passage and is convenient for testing a single-cylinder testing machine. The technical scheme is as follows:

the embodiment of the disclosure provides a variable tumble control mechanism, which comprises a shell, a flow blocking column, an end cover and a pointer;

the shell comprises a first end plate, a second end plate and a plurality of side plates, wherein the first end plate, the second end plate and the side plates are opposite, the side plates are connected with the first end plate and the second end plate, the first end plate, the second end plate and the side plates enclose a flow guide cavity, two opposite side plates in the side plates are respectively provided with a flow guide hole communicated with the flow guide cavity, and the first end plate is provided with a jack communicated with the flow guide cavity;

the end cover is rotatably arranged in the jack and is in movable sealing fit with the jack;

the cross section of the flow blocking column is arc-shaped, the flow blocking column is positioned in the flow guide cavity, one end of the flow blocking column is vertically connected to the end cover, the flow blocking column is coaxial with the end cover, and the end surface of the other end of the flow blocking column is in movable sealing fit with the second end plate;

the pointer is located outside the shell, the pointer is connected to the end cover, and the pointer is arranged along the radial direction of the end cover.

Optionally, an inner flange is arranged on the inner wall of the insertion hole, the diameter of the end cover is larger than the inner diameter of the inner flange, and the end cover is located on one side, away from the diversion cavity, of the inner flange.

Optionally, a first cylindrical boss is arranged on the end cover, the first cylindrical boss is coaxially connected with the choke post, and the first cylindrical boss is in sealing fit with the inner flange.

Optionally, the other end of the current-blocking column is coaxially connected with a circular rotating plate, the circular rotating plate is coaxially connected with a positioning shaft, the current-blocking column and the positioning shaft are located on two sides of the circular rotating plate, a cylindrical positioning groove is formed in the second end plate, and the positioning shaft is coaxially located in the cylindrical positioning groove.

Optionally, the variable tumble control mechanism further comprises a cover plate, the cover plate is located outside the housing, the cover plate is connected to the first end plate, a through hole is formed in the cover plate, a pointer installation table is coaxially connected to the end cover and located in the through hole, the pointer is located on the pointer installation table, and the pointer and the end cover are located on two sides of the cover plate.

Optionally, the cover plate is provided with a locking through hole, the orthographic projection of the locking through hole on the plane where the end cover is located on the end cover, and a set screw is arranged in the locking through hole.

Optionally, the cover plate has a second cylindrical boss thereon, the second cylindrical boss is located in the insertion hole, and the second cylindrical boss is in sealing fit with the insertion hole.

Optionally, scales are distributed on one surface, far away from the end cover, of the cover plate.

Optionally, one end of the pointer has a mounting ring, and the mounting ring is sleeved on the pointer mounting table.

Optionally, the edges of the two side plates have flange plates.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

through setting up casing, flow blocking post, end cover and pointer, the casing includes relative first end plate, second end plate, connects a plurality of curb plates of first end plate and second end plate, can enclose into the water conservancy diversion chamber by first end plate, second end plate and a plurality of sides. The two opposite side plates are provided with flow guide holes, oil gas can enter the flow guide cavity from the flow guide hole of one side plate during testing, and the oil gas can be discharged from the flow guide cavity from the flow guide hole of the other side plate. The first end plate is provided with a jack, the end cover can be arranged in the jack in a rotating mode and is in movable sealing fit with the jack, and oil gas can be prevented from leaking from the jack. The flow blocking column is positioned in the flow guiding cavity, one end of the flow blocking column is vertically connected to the end cover, the flow blocking column is coaxial with the end cover, the flow blocking column can be driven to rotate by rotating the end cover, the cross section of the flow blocking column is arched, the areas of the flow guiding holes communicated on the two side plates can be changed in the rotating process, therefore, the air passage can be quickly adjusted to roll, the pointer is connected to the end cover, the position of the flow blocking column can be intuitively reflected by the pointer, the areas of the flow guiding holes communicated on the two side plates can be conveniently known, and the purpose of quickly matching and optimizing the test scheme of the combustion system is achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a variable tumble control mechanism according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of a variable tumble control mechanism provided by an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a housing provided in an embodiment of the present disclosure;

fig. 4 is a partial structural schematic diagram of a variable tumble control mechanism provided in an embodiment of the present disclosure;

FIG. 5 is a schematic view of a portion of a second end plate according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a pointer provided in an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a cover plate according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

Fig. 1 is a schematic structural diagram of a variable tumble control mechanism according to an embodiment of the present disclosure, and fig. 2 is an exploded schematic structural diagram of the variable tumble control mechanism according to the embodiment of the present disclosure. As shown in fig. 2, the variable tumble flow control mechanism includes a housing 10, a choke post 20, an end cap 30, and a pointer 40.

Fig. 3 is a schematic structural diagram of a housing according to an embodiment of the present disclosure. As shown in fig. 3, the housing 10 includes a first end plate 101, a second end plate 102, and a plurality of side plates 103 connecting the first end plate 101 and the second end plate 102.

As shown in fig. 3, the first end plate 101, the second end plate 102 and the plurality of side plates 103 enclose a diversion cavity a, two opposite side plates 103 of the plurality of side plates 103 each have a diversion hole 103a communicating with the diversion cavity a, and the first end plate 101 has an insertion hole 101a communicating with the diversion cavity a.

The end cap 30 is rotatably mounted in the insertion hole 101a of the housing 10, and the end cap 30 is in movable sealing engagement with the insertion hole 101 a.

Fig. 4 is a partial structural schematic diagram of a variable tumble control mechanism according to an embodiment of the present disclosure. Referring to fig. 2 and 4, the cross section of the flow blocking post 20 is arcuate, the flow blocking post 20 is located in the flow guide cavity a, one end of the flow blocking post 20 is vertically connected to the end cover 30, the flow blocking post 20 is coaxial with the end cover 30, and the end surface of the other end of the flow blocking post 20 is in movable sealing fit with the second end plate 102.

The pointer 40 is located outside the housing 10, the pointer 40 is connected to the end cap 30, and the pointer 40 is arranged in a radial direction of the end cap 30.

Alternatively, the central angle corresponding to the arc of the cross section of the flow blocking column 20 may be 120 ° to 180 °, and too small and too large central angles corresponding to the arc of the cross section of the flow blocking column 20 are not beneficial for the flow blocking column 20 to block the communication area between the two side plates 103, and for example, the central angle corresponding to the arc of the cross section of the flow blocking column 20 may be 150 °.

In the disclosed embodiment, the flow-blocking post 20 corresponds to a post obtained by dividing a cylinder by a plane parallel to the axis of the cylinder. The axis of the cylinder corresponds to the axis of the flow blocking column 20. When the choke cylinder 20 is manufactured, a cylinder having the same radius and length as the choke cylinder 20 may be manufactured, and then the cylinder may be cut along a plane parallel to the axis of the cylinder to obtain the choke cylinder 20.

Alternatively, the flow guide holes 103a of the two side plates 103 may have the same shape and area. In the present disclosure, the shape of the diversion hole 103a shown in fig. 3 is only an example, and in other possible implementations, the diversion hole 103a may also be another shape, for example, the diversion hole 103a may also be a circle, an ellipse, or the like.

As shown in fig. 3, a partition 1032 may be disposed in the guide hole 103a, and the partition 1032 may be coplanar with an axis of the flow blocking post 20. The guide hole 103a is divided into two parts by a partition 1032. The partition 1032 can stabilize the airflow so that the airflow can enter the diversion cavity a more smoothly.

As shown in fig. 3, the edges of the two side plates 103 provided with the diversion holes 103a each have a flange plate 1031. The flange plate 1031 is provided with a connecting hole 1031a, so that the shell 10 can be conveniently connected with a single-cylinder testing machine by using bolts, and testing is facilitated.

Illustratively, the flange plate 1031 may have a polygonal shape.

The shape of the flange plate 1031 and the number and distribution positions of the connection holes 1031a on the flange plate 1031 may be set according to specific requirements. For example, in other possible implementations, the flange plate 1031 may also be fan-shaped, arcuate, etc.

The flange plate 1031 and the side plate 103 may be an integral structure, that is, the flange plate 1031 and the side plate 103 may be an integral plate, the flange plate 1031 and the side plate 103 may also be a separate structure, the flange plate 1031 and the side plate 103 may be formed separately and then connected, for example, the separately formed flange plate 1031 may be welded to the side plate 103.

The first end plate 101, the second end plate 102 and some of the plurality of side plates 103 may be flat plates, for example, two side plates 103 provided with the flow guiding holes 103a may be flat plates to facilitate connection with the single cylinder testing machine, and the other side plates 103 may be flat plates or curved plates. The first end plate 101 and the second end plate 102 may be flat plates, and the first end plate 101 and the second end plate 102 may be flat plates to facilitate installation of the flow blocking post 20, the end cap 30, and the like.

The housing 10 may be a metal structural member so as to withstand high temperatures. For example, the housing 10 may be a steel structural member.

As shown in fig. 3, the inner wall of the insertion hole 101a may have an inner flange 104 thereon. The end cap 30 may have a diameter greater than the inner diameter of the inner flange 104, and the end cap 30 is located on the side of the inner flange 104 away from the baffle cavity a. By providing the inner flange 104, the end cap 30 can be limited, and it is also convenient to arrange a sealing ring in the insertion hole 101a for sealing.

Illustratively, a sealing ring may be interposed between the end cover 30 and the inner flange 104 to enhance the sealing performance between the end cover 30 and the inner flange 104 and prevent oil gas from leaking.

In addition, a sealing ring may be interposed between the end cap 30 and the inner wall of the insertion hole 101a to further improve the sealing property.

The sealing ring adopted in the embodiment of the disclosure can be a high-temperature-resistant sealing ring so as to avoid sealing failure caused by temperature influence in the test process.

As shown in fig. 4, the end cap 30 may be provided with a first cylindrical boss 301. The first cylindrical boss 301 is coaxially connected with the choke post 20, and the first cylindrical boss 301 is in sealing fit with the inner flange 104.

Because the cross section of the flow blocking column 20 is arched instead of circular, the flow blocking column 20 cannot form sealing fit with the inner flange 104, the first cylindrical boss 301 is arranged on the end cover 30, the flow blocking column 20 is coaxially connected with the first cylindrical boss 301, and during assembly, the first cylindrical boss 301 can be located on the inner flange 104 to form sealing fit with the inner flange 104, so that oil and gas leakage from the jack 101a is avoided. Here, the first cylindrical boss 301 is in movable sealing fit with the inner flange 104, that is, the first cylindrical boss 301 can rotate relative to the inner flange 104 with the rotation of the end cover 30, and can maintain the sealing.

Alternatively, the end caps 30 and the choked flow posts 20 may be both metallic structural members to withstand the high temperatures that may be generated during testing.

The end cap 30 and the flow blocking post 20 may be a unitary structure. For example, the end cap 30 and the flow blocking post 20 may be integrally forged. The end cover 30 and the flow blocking column 20 can also be of a split structure, and are connected in a welding mode after being processed respectively.

As shown in fig. 4, one end of the choke post 20 is connected to the end cover 30, and the other end of the choke post 20 is coaxially connected to the circular rotating plate 201. The circular rotating plate 201 is coaxially connected with a positioning shaft 202, and the choke post 20 and the positioning shaft 202 are located on two sides of the circular rotating plate 201.

Fig. 5 is a partial structural schematic view of a second end plate according to an embodiment of the present disclosure. As shown in fig. 5, the second end plate 102 has a cylindrical positioning recess 102a formed therein. The positioning shaft 202 may be coaxially located in the cylindrical positioning recess 102 a.

The depth of the cylindrical positioning groove 102a is smaller than the thickness of the second end plate 102, that is, the cylindrical positioning groove 102a does not penetrate the second end plate 102, so as to prevent oil gas from leaking from the cylindrical positioning groove 102 a.

The cylindrical positioning groove 102a may be provided with a bearing, and the positioning shaft 202 may be connected to the bearing, so that the rotation of the current blocking column 20 may be facilitated by the provision of the bearing.

Illustratively, the bearing may be a thrust bearing.

After the choke post 20 is mounted to the housing 10, one end of the choke post 20 is mounted on the first end plate 101 under the support of the end cover 30, and the other end of the choke post 20 is mounted on the second end plate 102 through the engagement of the positioning shaft 202 and the cylindrical positioning groove 102 a. The positioning shaft 202 is rotatably engaged with the cylindrical positioning groove 102a, and the positioning shaft 202 is rotatable in the cylindrical positioning groove 102a when the choke post 20 is rotated. The current blocking post 20 is supported by the cylindrical positioning groove 102a and the insertion hole 101 a.

The axial length of the positioning shaft 202 may be less than or equal to the depth of the cylindrical positioning groove 102a, so that when the choke cylinder 20 is installed, the positioning shaft 202 may be pushed in the axial direction, so that the circular rotating plate 201 can maintain contact with the inner wall of the second end plate 102.

The circular rotating plate 201 and the second end plate 102 can be in movable sealing fit, and a sealing ring can be clamped between the circular rotating plate 201 and the second end plate 102 to prevent oil gas from directly passing through a gap between the circular rotating plate 201 and the second end plate 102.

The circular rotating plate 201, the positioning shaft 202 and the flow blocking post 20 may be an integral structure. For example, the circular rotating plate 201, the positioning shaft 202 and the current blocking post 20 may be integrally forged. The circular rotating plate 201, the positioning shaft 202 and the flow resisting column 20 can also be in a split structure, and are connected in a welding mode after being processed respectively.

Referring to fig. 2, the variable tumble control mechanism may further include a cover plate 50. The cover plate 50 is located outside the housing 10, and the cover plate 50 is attached to the first end plate 101. The cover plate 50 is provided with a through hole 501a, the end cover 30 is coaxially connected with a pointer mounting table 302, the pointer mounting table 302 is positioned in the through hole 501a, the pointer 40 is positioned on the pointer mounting table 302, and the pointer 40 and the end cover 30 are positioned on two sides of the cover plate 50.

Due to the higher pressure in diversion chamber a, end cap 30 may be ejected from receptacle 101a under pressure. By providing the cover plate 50 and connecting the cover plate 50 to the first end plate 101, the cover plate 50 can be used to block the end cap 30 in the insertion hole 101a, and the end cap 30 is confined in the insertion hole 101a by the inner flange 104 and the cover plate 50, so as to prevent the end cap 30 from being removed from the insertion hole 101 a.

Through set up through-hole 501a on apron 50, pointer mount table 302 is located through-hole 501a, utilizes pointer mount table 302 to carry out the installation of pointer 40, can't directly rotate end cover 30 because the influence of apron 50, can drive current blocking post 20 through rotating pointer 40 or rotating pointer mount table 302 this moment and take place the rotation.

Alternatively, the cover plate 50 may have a rectangular shape, a circular shape, an oval shape, etc., and only the cover plate 50 having a rectangular shape is illustrated in fig. 2.

Alternatively, the cover plate 50 may be a metal structural member to withstand high temperatures that may be generated during testing. For example, stainless steel structural members.

Fig. 6 is a schematic structural diagram of a pointer provided in an embodiment of the present disclosure. As shown in fig. 6, one end of the pointer 40 may have a mounting ring 401. Mounting ring 401 may be sleeved over pointer mounting block 302. When the pointer 40 needs to be attached and detached, the mounting ring 401 can be directly detached from the pointer mounting base 302 or can be attached to the pointer mounting base 302.

Alternatively, the cross section of the pointer mounting base 302 may be non-circular, such as rectangular, oval, triangular, etc., and the relative rotation between the pointer 40 and the pointer mounting base 302 can be avoided by setting the cross section of the pointer mounting base 302 to be non-circular.

As shown in fig. 2, a limit bolt 402 may be further connected to an end surface of the pointer mounting base 302, and the limit bolt 402 is screwed into the end surface of the pointer mounting base 302, so that a bolt head of the limit bolt 402 blocks the mounting ring 401 of the pointer 40 to limit the pointer 40, thereby preventing the mounting ring 401 of the pointer 40 from falling off the pointer mounting base 302.

Optionally, the cover plate 50 and the first end plate 101 may be connected by a bolt 504, and the bolt 504 is used for connection, so that the variable tumble control mechanism is convenient to disassemble and assemble, and is beneficial to maintenance.

As shown in fig. 2, a scale 503 may be distributed on a surface of the cover plate 50 away from the end cap 30. The scale 503 can be used to facilitate the experimenter to determine the angle state of the flow blocking column 20 so as to know the communication condition of the two flow guiding holes 103 a.

The minimum communication area between the two diversion holes 103a may be 0, that is, the two diversion holes 103a may be completely blocked by rotating the flow blocking column 20, and the minimum communication area between the two diversion holes 103a may also be greater than 0, that is, the two diversion holes 103a always remain in communication no matter how the flow blocking column 20 is rotated. By changing the outer diameter of the baffle column 20, if the radius of the baffle column 20 is large enough, the minimum communication area between the two guide holes 103a can be set to 0. The scale 503 can be set according to different needs to facilitate the understanding of the experimenter. For example, the scale 503 pointed by the pointer 40 when the communication area between the two diversion holes 103a reaches the maximum may be set as the 0 scale.

Alternatively, the scale 503 may be formed by scribing the cover plate 50, and the scale 503 is formed on the surface of the cover plate 50 by scribing, so that compared with a common printing method, the situation that the scale 503 fades can be prevented from affecting the observation. Of course, the scale 503 can be formed on the cover plate 50 by printing, which is simpler and less expensive.

In addition, the scale 503 may be provided on the cover plate 50 by means of adhesion, for example, the scale 503 may be located on a plate body, and the plate body may be adhered to the cover plate 50. The plate body may be a metal sheet or a non-metal sheet.

The scales 503 are indirectly arranged on the cover plate 50 through the plate body, so that the scales 503 can be conveniently replaced, and the forms of the scales 503 can be conveniently changed.

Fig. 7 is a schematic structural diagram of a cover plate according to an embodiment of the present disclosure. As shown in fig. 7, the cover plate 50 may further have a second cylindrical boss 501 thereon. A second cylindrical boss 501 is located in the socket 101a, the second cylindrical boss 501 being in sealing engagement with the socket 101 a.

When the cover plate 50 is mounted on the first end plate 101, the second cylindrical boss 501 extends into the insertion hole 101a, so that the end cover 30 can be axially limited. The end cap 30 is prevented from coming out of the insertion hole 101 a. The second cylindrical boss 501 is in sealing fit with the insertion hole 101a, and can further improve the sealing performance of the variable tumble control mechanism at the insertion hole 101 a.

As shown in fig. 7, the cover plate 50 may further have a plurality of locking through holes 501b, an orthographic projection of the locking through holes 501b on the plane of the end cover 30 is located on the end cover 30, and the locking through holes 501b may be provided with set screws 502.

In the test process, after the flow blocking column 20 is rotated to a proper position, the set screw 502 can be screwed, and the end cover 30 is tightly pressed against the set screw 502, so that the flow blocking column 20 is kept at the current position, and the flow blocking column 20 is prevented from rotating in the test process.

Optionally, a plurality of locking through holes 501b may be provided on the cover plate 50, and the plurality of locking through holes 501b may be distributed at intervals along the circumferential direction of the through holes 501a to better press against the end cover 30.

Illustratively, the cover plate 50 may be provided with two locking through holes 501b, and the two locking through holes 501b are arranged in a central symmetry manner with respect to the through hole 501 a.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A variable tumble control mechanism characterized by comprising a housing (10), a choke post (20), an end cap (30), and a pointer (40);

the shell (10) comprises a first end plate (101), a second end plate (102) and a plurality of side plates (103) which are opposite to each other and are connected with the first end plate (101) and the second end plate (102), wherein the first end plate (101), the second end plate (102) and the side plates (103) enclose a flow guide cavity (A), two opposite side plates (103) in the side plates (103) are provided with flow guide holes (103a) which are communicated with the flow guide cavity (A), and the first end plate (101) is provided with a plug hole (101a) which is communicated with the flow guide cavity (A);

the end cover (30) is rotatably installed in the jack (101a), and the end cover (30) is in movable sealing fit with the jack (101 a);

the cross section of the flow blocking column (20) is arc-shaped, the flow blocking column (20) is located in the flow guide cavity (A), one end of the flow blocking column (20) is vertically connected to the end cover (30), the flow blocking column (20) is coaxial with the end cover (30), and the end face of the other end of the flow blocking column (20) is in movable sealing fit with the second end plate (102);

the pointer (40) is located outside the shell (10), the pointer (40) is connected to the end cover (30), and the pointer (40) is arranged along the radial direction of the end cover (30).

2. The variable tumble control mechanism according to claim 1, characterized in that said insertion hole (101a) has an inner flange (104) on its inner wall, said end cap (30) has a diameter larger than the inner diameter of said inner flange (104), and said end cap (30) is located on the side of said inner flange (104) away from said flow guide cavity (a).

3. The variable tumble control mechanism according to claim 2, characterized in that said end cap (30) is provided with a first cylindrical boss (301), said first cylindrical boss (301) is coaxially connected with said flow blocking column (20), said first cylindrical boss (301) is in sealing engagement with said inner flange (104).

4. The variable tumble control mechanism according to claim 1, characterized in that a circular rotating plate (201) is coaxially connected to the other end of said flow blocking column (20), a positioning shaft (202) is coaxially connected to said circular rotating plate (201), said flow blocking column (20) and said positioning shaft (202) are located on both sides of said circular rotating plate (201), said second end plate (102) has a cylindrical positioning groove (102a), and said positioning shaft (202) is coaxially located in said cylindrical positioning groove (102 a).

5. The variable tumble control mechanism according to claim 1, characterized in that said variable tumble control mechanism further comprises a cover plate (50), said cover plate (50) is located outside said housing (10), said cover plate (50) is connected to said first end plate (101), said cover plate (50) has a through hole (501a), said end cap (30) has a pointer mounting table (302) coaxially connected thereto, said pointer mounting table (302) is located in said through hole (501a), said pointer (40) is located on said pointer mounting table (302), said pointer (40) and said end cap (30) are located on both sides of said cover plate (50).

6. The variable tumble control mechanism according to claim 5, characterized in that said cover plate (50) has a locking through hole (501b), said locking through hole (501b) is located on said end cover (30) in an orthographic projection of a plane of said end cover (30), and a set screw (502) is disposed in said locking through hole (501 b).

7. The variable tumble control mechanism according to claim 5, characterized in that said cover plate (50) has a second cylindrical boss (501) thereon, said second cylindrical boss (501) being located in said receptacle (101a), said second cylindrical boss (501) being in sealing engagement with said receptacle (101 a).

8. The variable tumble control mechanism according to claim 5, characterized in that a scale (503) is distributed on a face of said cover plate (50) away from said end cap (30).

9. The variable tumble control mechanism according to claim 5, characterized in that one end of said pointer (40) has a mounting ring (401), said mounting ring (401) being sleeved on said pointer mounting table (302).

10. The variable tumble control mechanism according to any of claims 1 to 9, characterized in that the edges of said two side plates (103) have flange plates (1031).