CN111817143B

CN111817143B - Low-noise prefabricated substation

Info

Publication number: CN111817143B
Application number: CN202010675518.0A
Authority: CN
Inventors: 孙建辉; 吴桂林; 熊海桥; 王革; 陈浪
Original assignee: Jiangxi Mingzheng Transformation Equipment Co ltd
Current assignee: Jiangxi Mingzheng Transformation Equipment Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2022-05-17
Anticipated expiration: 2040-07-14
Also published as: CN111817143A

Abstract

The invention belongs to the technical field of prefabricated substations and discloses a low-noise prefabricated substation which comprises a shell, wherein the bottom of the shell is fixedly connected with a mounting plate, four corners of the top of the mounting plate are respectively provided with a mounting hole, the left side and the right side of the shell are respectively embedded with a heat dissipation net, a machine body is arranged in the shell, and the bottom of the machine body is fixedly connected with a fixing block. This scheme is when the organism operation and produce the vibration, the direction of motion through guider fixed block and organism is located vertical direction up-and-down motion, and along with the up-and-down motion of organism and spacing and the direction through slider and horizontal groove, make two down tubes drive two connecting blocks and be close to each other and keep away from each other, thereby turn into the horizontal direction with the power of vertical side and fall the subassembly of making an uproar and fall mutually supporting of making an uproar through the one-level damping, offset the atress, reduce vibration, thereby reduce the rigid collision of organism and casing, the noise reduction.

Description

Low-noise prefabricated substation

Technical Field

The invention relates to the technical field of a prefabricated substation, in particular to a low-noise prefabricated substation.

Background

The prefabricated substation has small volume, small occupied area, light weight, low cost and reliability, and is called a box type transformer or a prefabricated substation.

The preassembled transformer substation generally comprises a shell and a machine body, wherein the machine body is located inside the shell and at the core of the whole transformer substation, the machine body can vibrate during operation and is in rigid collision with the shell 1, noise is generated, and the service life of the machine body is shortened.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide a low-noise preassembled transformer substation, which has the advantages of vibration reduction and noise reduction and solves the problems that the machine body generates vibration during operation and is in rigid collision with a shell 1, so that noise is generated and the service life of the machine body is shortened.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A low-noise preassembled transformer substation comprises a shell, wherein the bottom of the shell is fixedly connected with a mounting plate, four corners of the top of the mounting plate are respectively provided with a mounting hole, radiating nets are embedded on the left side and the right side of the shell, a machine body is arranged in the shell, the bottom of the machine body is fixedly connected with a fixed block, vibration and noise reduction devices are arranged at the bottom of the fixed block, at least two groups of vibration and noise reduction devices are arranged from front to back, vertically arranged guide devices are arranged on the left side and the right side of each vibration and noise reduction device, and the top of each guide device is fixedly connected with the bottom of the machine body;

the vibration and noise reduction device comprises two inclined rods, wherein the tops of the inclined rods are hinged to the bottoms of the fixed blocks respectively, the inclined rods are hinged to one ends, away from the machine body, of the inclined rods, connecting blocks are hinged to one ends, away from the machine body, of the inclined rods, sliding blocks are fixedly connected to the bottoms of the connecting blocks, horizontal grooves are formed in the inner bottom wall of the shell, the sliding blocks are connected with the horizontal grooves in a sliding mode respectively, two are fixedly connected to one-level vibration and noise reduction assemblies, away from one side of each connecting block, and guide devices are connected with the two one-level vibration and noise reduction assemblies respectively, two are arranged on the connecting blocks and are provided with two-level vibration and noise reduction assemblies respectively, and the two-level vibration and noise reduction assemblies are connected with the two connecting blocks.

Preferably, guider includes the direction shell, the bottom of direction shell and the interior diapire fixed connection of casing, the top of direction shell alternates and is provided with the guide bar, the top of guide bar and the bottom fixed connection of fixed block, the bottom fixedly connected with movable block of guide bar, the lateral surface of movable block and the smooth contact of inside wall of direction shell.

Preferably, two the subassembly of making an uproar falls in one-level damping all includes hollow base, two the bottom of hollow base respectively with the interior diapire fixed connection of casing, two one side that hollow base is relative all alternates and is provided with the horizon bar, two the one end that the horizon bar is relative deviates from one side fixed connection respectively with two connecting blocks mutually, two the one end that the horizon bar deviates from mutually just is located the equal fixedly connected with displacement piece in the hollow base, two the top of displacement piece all is provided with buffering subassembly, two the equal fixedly connected with one-level damping spring in one side that the displacement piece deviates from mutually, two the one end that displacement piece was kept away from to one-level damping spring respectively with the inner wall fixed connection of two hollow bases.

Preferably, the subassembly of making an uproar falls in second grade damping includes the second grade and falls a section of thick bamboo of making an uproar, the left side of the second grade fall a section of thick bamboo of making an uproar and the right side fixed connection of left connecting block, the second grade falls a section of thick bamboo left side inner wall fixedly connected with second grade damping spring, second grade damping spring's right-hand member fixedly connected with connecting rod, the right-hand member of connecting rod run through and extend to the right side of the second grade fall a section of thick bamboo of making an uproar and with the left side fixed connection of the connecting block on right side.

Preferably, the top and the bottom of connecting rod all fixed link have the stopper, the top and the bottom of a section of thick bamboo of making an uproar are fallen to the second grade all set up horizontal spacing mouth, two the stopper is located two horizontal spacing mouths respectively and rather than the adaptation.

Preferably, the buffering assembly comprises an inclined groove formed in the top of the displacement block, a trapezoidal block is arranged in the inclined groove, the bottom of the trapezoidal block is consistent with the inclined plane of the inclined groove, a groove is formed in the inner top wall of the hollow base, the top of the trapezoidal block extends to the inside of the groove and is fixedly connected with a buffering spring, and the top of the buffering spring is fixedly connected with the inner top wall of the groove.

Preferably, the equal fixedly connected with guide block in the left and right sides of trapezoidal piece, the guide way has all been seted up to the left and right sides of recess inner wall, two the guide block respectively with two guide way sliding connection.

Preferably, the displacement block is square and the lateral surface smoothly contacts with the inside wall of hollow base, the last cover of horizon bar is equipped with auxiliary spring.

3. Compared with the prior art, the invention has the advantages that:

(1) this scheme is when the organism operation and produce the vibration, the direction of motion through guider fixed block and organism is located vertical direction up-and-down motion, and along with the up-and-down motion of organism and spacing and the direction through slider and horizontal groove, make two down tubes drive two connecting blocks and be close to each other and keep away from each other, thereby turn into the horizontal direction with the power of vertical side and fall the subassembly of making an uproar and fall mutually supporting of making an uproar through the one-level damping, offset the atress, reduce vibration, thereby reduce the rigid collision of organism and casing, the noise reduction.

(2) Through the mutual cooperation of direction shell, guide bar and movable block for the fixed block moves about in vertical direction all the time when vibrating, reduces the rigid collision of organism and casing, noise reduction.

(3) When two connecting blocks move mutually in opposite directions, drive two horizon bars and move to the direction of hollow base to drive displacement piece extrusion one-level damping spring, one-level damping spring compression deformation and production counter-potential elasticity offset partial atress, and when two connecting block relative motion, the horizon bar produces pulling force to one-level damping spring, the tensile deformation of one-level damping spring offsets partial atress, and cooperate the supplementary of second grade damping noise reduction subassembly, reach the effect of making an uproar of splendid damping noise reduction.

(4) Can drive two second grade along with the motion of two connecting blocks and fall a section of thick bamboos and the connecting rod is close to each other or keep away from each other for second grade damping spring deformation, and then offset a part atress, and cooperate the assistance of the subassembly of making an uproar of falling of one-level, the damping noise reduction effect is splendid, can play spacing and guide effect to the connecting rod through stopper and the spacing mouthful mutually supporting of level, makes its movement track guarantee not change.

(5) In the process that the displacement block extrudes the primary damping spring, and through the design of the inclined groove, a part of stress is decomposed and is positioned in the vertical direction and extrudes the trapezoidal block, the trapezoidal block is driven to move towards the inner part of the groove, the buffer spring is driven to compress, and the part of stress is offset, so that the damping and noise reduction effects are further improved.

(6) Can play spacing and guide effect to trapezoidal piece through the design of guide block and guide way, the displacement piece is square piece and the smooth contact of lateral surface and hollow base's inside wall to prevent that displacement piece motion trajectory from changing, can further improve the effect of making an uproar through auxiliary spring.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the vibration and noise reduction apparatus of FIG. 1 in accordance with the present invention;

FIG. 3 is an enlarged view of the primary vibration and noise reduction assembly of FIG. 2 in accordance with the present invention;

FIG. 4 is a perspective view of the displacement block of FIG. 2 in accordance with the present invention;

FIG. 5 is an enlarged view of the secondary vibration and noise reduction assembly of FIG. 2 in accordance with the present invention.

The reference numbers in the figures illustrate:

1. a housing; 2. mounting a plate; 3. mounting holes; 4. a heat-dissipating web; 5. a body; 6. a fixed block; 7. a vibration and noise reduction device; 71. a diagonal rod; 72. connecting blocks; 73. a slider; 74. a horizontal groove; 75. a first-stage vibration and noise reduction assembly; 751. a hollow base; 752. a horizontal bar; 753. a displacement block; 754. a buffer assembly; 755. a primary damping spring; 76. a secondary vibration and noise reduction component; 761. a secondary noise reduction cylinder; 762. a secondary damping spring; 763. a connecting rod; 764. a limiting block; 765. a horizontal limiting port; 8. a guide device; 81. a guide housing; 82. a guide bar; 83. a movable block; 9. an inclined groove; 10. a trapezoidal block; 11. a groove; 12. a buffer spring; 13. a guide block; 14. a guide groove; 15. an auxiliary spring.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is to be understood that the embodiments described are merely exemplary embodiments, rather than exemplary embodiments, and that all other embodiments may be devised by those skilled in the art without departing from the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-5, a low-noise preassembled transformer substation comprises a housing 1, wherein a mounting plate 2 is fixedly connected to the bottom of the housing 1, mounting holes 3 are formed in four corners of the top of the mounting plate 2, heat dissipation nets 4 are embedded in the left side and the right side of the housing 1, a machine body 5 is arranged inside the housing 1, a fixed block 6 is fixedly connected to the bottom of the machine body 5, vibration and noise reduction devices 7 are arranged at the bottom of the fixed block 6, the vibration and noise reduction devices 7 are at least two groups and are arranged from front to back, vertically arranged guide devices 8 are arranged on the left side and the right side of each vibration and noise reduction device 7, and the top of each guide device 8 is fixedly connected with the bottom of the machine body 5;

the vibration and noise reduction device 7 comprises two inclined rods 71, the tops of the two inclined rods 71 are respectively hinged with the bottom of the fixed block 6, one ends of the two inclined rods 71, which are far away from the machine body 5, are respectively hinged with a connecting block 72, the bottoms of the two connecting blocks 72 are respectively fixedly connected with a slide block 73, the inner bottom wall of the shell 1 is provided with a horizontal groove 74, the two slide blocks 73 are respectively connected with the horizontal groove 74 in a sliding manner, one sides of the two connecting blocks 72, which are far away from each other, are respectively fixedly connected with a primary vibration and noise reduction assembly 75, the two guide devices 8 are respectively connected with the two primary vibration and noise reduction assemblies 75, the two connecting blocks 72 are provided with a secondary vibration and noise reduction assembly 76, the secondary vibration and noise reduction assembly 76 is respectively connected with the two connecting blocks 72, when the machine body 5 runs and generates vibration, the moving directions of the fixed block 6 and the machine body 5 are located in the vertical direction to move up and down through the slide blocks 73 and the horizontal groove 74 to limit and guide along with the up and down movement of the machine body 5, make two down tube 71 drive two connecting blocks 72 and be close to each other and keep away from each other to turn into the horizontal direction with the ascending power of vertical direction and through mutually supporting of one-level damping and noise reduction subassembly 75 and second grade damping and noise reduction subassembly 76, offset the atress, reduce vibration, thereby reduce the rigid collision of organism 5 and casing 1, noise reduction.

Further, guider 8 is including direction shell 81, the bottom of direction shell 81 and the interior diapire fixed connection of casing 1, the top of direction shell 81 alternates and is provided with guide bar 82, the top of guide bar 82 and the bottom fixed connection of fixed block 6, the bottom fixedly connected with movable block 83 of guide bar 82, the lateral surface of movable block 83 and the smooth contact of inside wall of direction shell 81, through direction shell 81, the mutually supporting of guide bar 82 and movable block 83, make fixed block 6 move about in vertical direction all the time when the vibration, reduce organism 5 and casing 1's rigid collision, the noise reduction.

Further, the two first-stage vibration and noise reduction assemblies 75 each comprise a hollow base 751, the bottoms of the two hollow bases 751 are fixedly connected with the inner bottom wall of the casing 1, horizontal rods 752 are inserted into the opposite sides of the two hollow bases 751, the opposite ends of the two horizontal rods 752 are fixedly connected with the opposite sides of the two connecting blocks 72, displacement blocks 753 are fixedly connected with the opposite ends of the two horizontal rods 752 and positioned in the hollow bases 751, buffer assemblies 754 are arranged on the tops of the two displacement blocks 753, first-stage vibration reduction springs 755 are fixedly connected with the opposite sides of the two displacement blocks 753, the ends of the two first-stage vibration reduction springs 755 far away from the displacement blocks 753 are fixedly connected with the inner walls of the two hollow bases 751, when the two connecting blocks 72 move oppositely, the two horizontal rods 752 are driven to move towards the hollow bases 751, and the displacement blocks 753 are driven to squeeze the first-stage vibration reduction springs 755, the first-stage damping spring 755 is compressed and deformed to generate counter-potential elastic force to offset partial stress, and when the two connecting blocks 72 move relatively, the horizontal rod 752 generates pulling force on the first-stage damping spring 755, the first-stage damping spring 755 is stretched and deformed to offset partial stress, and the secondary damping noise reduction assembly 76 is matched to achieve excellent damping noise reduction effect.

Further, a second grade damping noise reduction subassembly 76 includes a second grade noise reduction section of thick bamboo 761, the left side of a second grade noise reduction section of thick bamboo 761 and the right side fixed connection of left connecting block 72, a second grade noise reduction section of thick bamboo 761 left side inner wall fixedly connected with second grade damping spring 762, the right-hand member fixedly connected with connecting rod 763 of second grade damping spring 762, the right-hand member of connecting rod 763 runs through and extends to the right side of a second grade noise reduction section of thick bamboo 761 and with the left side fixed connection of the connecting block 72 on right side, can drive two second grade noise reduction section of thick bamboo 761 and connecting rod 763 and be close to each other or keep away from each other along with the motion of two connecting blocks 72, make second grade damping spring 762 deform, and then offset partly atress, and cooperate the assistance of one-level damping noise reduction subassembly 75, the damping noise reduction effect is splendid.

Further, the top and the bottom of connecting rod 763 all are fixed to be linked there is stopper 764, and the top and the bottom of a section of thick bamboo 761 of making an uproar are fallen to the second grade all are seted up and are had spacing mouthful 765 of level, and two stopper 764 are located two spacing mouths 765 of level respectively and rather than the adaptation, can play spacing and guide effect to connecting rod 763 through stopper 764 with mutually supporting with spacing mouthful 765 of level, make its motion trail keep unchangeable.

Further, buffer assembly 754 includes the inclined groove 9 of seting up at displacement piece 753 top, be provided with trapezoidal piece 10 in the inclined groove 9, the bottom of trapezoidal piece 10 is unanimous with the inclined plane of inclined groove 9, recess 11 is seted up to the interior roof of hollow base 751, the inside and fixedly connected with buffer spring 12 of recess 11 are extended to the top of trapezoidal piece 10, buffer spring 12's top and recess 11 interior roof fixed connection, extrude the in-process of one-level damping spring 755 at displacement piece 753, and through the design of inclined groove 9, make partly atress decompose and be located vertical direction and extrude trapezoidal piece 10, drive trapezoidal piece 10 to recess 11 internal motion, drive buffer spring 12 compression, thereby offset some atress, further improve the vibration/noise reduction effect.

Further, the equal fixedly connected with guide block 13 in the left and right sides of trapezoidal piece 10, guide way 14 has all been seted up to the left and right sides of recess 11 inner wall, two guide blocks 13 respectively with two guide way 14 sliding connection, can play spacing and guide effect to trapezoidal piece 10 through the design of guide block 13 and guide way 14.

Further, displacement piece 753 is square piece and lateral surface and the smooth contact of the inside wall of hollow base 751 to prevent that displacement piece 753 movement track from changing, the cover is equipped with auxiliary spring 15 on the horizon bar 752, can further improve the effect of making an uproar that subtracts vibration through auxiliary spring 15.

The working principle is as follows: when the machine body 5 runs and generates vibration, the motion directions of the fixed block 6 and the machine body 5 are located in the vertical direction to move up and down through the guide device 8, and along with the up-and-down motion of the machine body 5, the two inclined rods 71 drive the two connecting blocks 72 to approach to each other and move away from each other through the limiting and guiding of the sliding block 73 and the horizontal groove 74, so that the force in the vertical direction is converted into the horizontal direction;

when the two connecting blocks 72 move back to back, the two horizontal rods 752 are driven to move towards the hollow base 751, the displacement block 753 is driven to extrude the primary damping spring 755, the primary damping spring 755 is compressed and deformed to generate counter-potential elastic force to offset partial stress, in the process that the displacement block 753 extrudes the primary damping spring 755, through the design of the inclined groove 9, a part of stress is decomposed to be positioned in the vertical direction and extrude the trapezoidal block 10, the trapezoidal block 10 is driven to move towards the groove 11, the buffer spring 12 is driven to be compressed, partial stress is offset, meanwhile, the secondary noise reduction cylinder 761 and the connecting rod 763 of the secondary vibration reduction and noise reduction assembly 76 are far away from each other, the secondary damping spring 762 is stretched and deformed to generate counter-potential elastic force to offset partial stress, so that a good vibration reduction effect is achieved, rigid collision between the machine body 5 and the shell 1 is reduced, and noise is reduced;

when the two connecting blocks 72 move relatively, the second-level noise reduction cylinder 761 and the connecting rod 763 approach each other and drive the second-level damping spring 762 to compress, at this time, the horizontal rod 752 generates a pulling force on the first-level damping spring 755, the first-level damping spring 755 deforms in a stretching manner to offset part of the stress, and the above processes are repeated in a circulating manner to achieve a good damping effect, so that the rigid collision between the machine body 5 and the shell 1 is reduced, and the noise is reduced.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. A low-noise preassembled transformer substation comprises a shell (1), and is characterized in that: the bottom of the shell (1) is fixedly connected with a mounting plate (2), four corners of the top of the mounting plate (2) are provided with mounting holes (3), radiating nets (4) are embedded on the left side and the right side of the shell (1), a machine body (5) is arranged inside the shell (1), the bottom of the machine body (5) is fixedly connected with a fixed block (6), vibration and noise reduction devices (7) are arranged at the bottom of the fixed block (6), the vibration and noise reduction devices (7) are at least two groups and are arranged from front to back, the left side and the right side of each vibration and noise reduction device (7) are provided with vertically arranged guide devices (8), and the top of each guide device (8) is fixedly connected with the bottom of the machine body (5) respectively;

the vibration and noise reduction device (7) comprises two inclined rods (71), the tops of the two inclined rods (71) are respectively hinged with the bottom of the fixed block (6), one ends of the two inclined rods (71) far away from the machine body (5) are respectively hinged with a connecting block (72), the bottoms of the two connecting blocks (72) are respectively and fixedly connected with a sliding block (73), a horizontal groove (74) is formed in the inner bottom wall of the shell (1), the two sliding blocks (73) are respectively connected with the horizontal groove (74) in a sliding manner, one sides of the two connecting blocks (72) which are far away from each other are fixedly connected with a primary vibration and noise reduction assembly (75), the two guide devices (8) are respectively connected with the two primary vibration and noise reduction assemblies (75), the two connecting blocks (72) are provided with a secondary vibration and noise reduction assembly (76), the secondary vibration and noise reduction assembly (76) is respectively connected with the two connecting blocks (72);

the two first-stage vibration and noise reduction assemblies (75) respectively comprise hollow bases (751), the bottoms of the two hollow bases (751) are respectively fixedly connected with the inner bottom wall of the shell (1), horizontal rods (752) are respectively arranged on one opposite sides of the two hollow bases (751) in a penetrating manner, one opposite ends of the two horizontal rods (752) are respectively fixedly connected with one opposite sides of the two connecting blocks (72), displacement blocks (753) are respectively and fixedly connected with one opposite ends of the two horizontal rods (752) and positioned in the hollow bases (751), the tops of the two displacement blocks (753) are respectively provided with a buffer assembly (754), one opposite sides of the two displacement blocks (753) are respectively and fixedly connected with first-stage vibration and noise reduction springs (755), and one ends of the two first-stage vibration and noise reduction springs (755) far away from the displacement blocks (753) are respectively and fixedly connected with the inner walls of the two hollow bases (751);

the secondary vibration and noise reduction assembly (76) comprises a secondary noise reduction barrel (761), the left side of the secondary noise reduction barrel (761) is fixedly connected with the right side of the connecting block (72) on the left side, the inner wall of the left side of the secondary noise reduction barrel (761) is fixedly connected with a secondary vibration and noise reduction spring (762), the right end of the secondary vibration and noise reduction spring (762) is fixedly connected with a connecting rod (763), and the right end of the connecting rod (763) penetrates through and extends to the right side of the secondary noise reduction barrel (761) and is fixedly connected with the left side of the connecting block (72) on the right side;

the top and the bottom of the connecting rod (763) are fixedly connected with limiting blocks (764), the top and the bottom of the secondary noise reduction cylinder (761) are respectively provided with a horizontal limiting opening (765), and the two limiting blocks (764) are respectively positioned in the two horizontal limiting openings (765) and are matched with the two horizontal limiting openings;

the buffer assembly (754) comprises an inclined groove (9) formed in the top of a displacement block (753), a trapezoidal block (10) is arranged in the inclined groove (9), the bottom of the trapezoidal block (10) is consistent with the inclined plane of the inclined groove (9), a groove (11) is formed in the inner top wall of the hollow base (751), the top of the trapezoidal block (10) extends into the groove (11) and is fixedly connected with a buffer spring (12), and the top of the buffer spring (12) is fixedly connected with the inner top wall of the groove (11);

the left side and the right side of the trapezoidal block (10) are fixedly connected with guide blocks (13), the left side and the right side of the inner wall of the groove (11) are respectively provided with a guide groove (14), and the two guide blocks (13) are respectively in sliding connection with the two guide grooves (14);

displacement piece (753) is square piece and lateral surface and the smooth contact of inside wall of hollow base (751), the cover is equipped with auxiliary spring (15) on horizontal bar (752).

2. A low noise pre-installed substation according to claim 1, characterized in that: guider (8) are including direction shell (81), the bottom of direction shell (81) and the interior diapire fixed connection of casing (1), the top of direction shell (81) alternates and is provided with guide bar (82), the top of guide bar (82) and the bottom fixed connection of fixed block (6), the bottom fixedly connected with movable block (83) of guide bar (82), the lateral surface of movable block (83) and the inside wall smooth contact of direction shell (81).