CN112362124B

CN112362124B - Mechanical transmission group of diaphragm gas meter

Info

Publication number: CN112362124B
Application number: CN202011333795.XA
Authority: CN
Inventors: 刘显峰; 张陆军; 张勇; 周纪明
Original assignee: Qianwei Meters Chongqing Co Ltd
Current assignee: Qianwei Meters Chongqing Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2024-07-26
Anticipated expiration: 2040-11-24
Also published as: CN112362124A

Abstract

The invention discloses a mechanical transmission group of a diaphragm gas meter, which comprises a shaft sleeve, a connecting shaft, a transmission shaft, a shifting block, an end cover and a leather cup, wherein the shaft sleeve is connected with the connecting shaft; the outer surface of the shaft sleeve is provided with a shaft sleeve assembling and fixing structure for fixing and mounting on the upper shell of the diaphragm gas meter; the transmission shaft is rotatably inserted in the shaft sleeve; the leather cup is sleeved on the transmission shaft; the two axial ends of the transmission shaft are respectively provided with a connecting section with knurling on the outer side, one of the two connecting sections is a transmission input section, and the other section is a transmission output section; the transmission input section is fixedly provided with a shifting block; the transmission output section is coaxially and fixedly provided with a connecting shaft, and the connecting shaft is used for sleeving a driving gear of the driving counter; the method is characterized in that: annular grooves are formed in each connecting section of the transmission shaft; the inner side surfaces of the shifting block and the connecting shaft are respectively provided with an annular bulge which is clamped into the annular groove. The mechanical transmission group of the diaphragm gas meter has the advantages of better anti-falling function and higher reliability.

Description

Mechanical transmission group of diaphragm gas meter

Technical Field

The invention belongs to the field of membrane gas meters, and particularly relates to a mechanical transmission group of a membrane gas meter.

Background

A diaphragm gas meter is a common gas meter. The working principle of the diaphragm gas meter is as follows:

When flowing gas passes through the gas meter, the flowing gas is blocked by pipeline friction and a mechanism, pressure difference is generated at two ends of an inlet and an outlet of the gas meter by the gas in the gas meter, the diaphragm of the diaphragm type gas meter is pushed to move in the metering chamber by the pressure difference, and the valve mechanism is driven to coordinate and distribute gas, so that the movement of the diaphragm can be continuously and reciprocally carried out. The film type gas meter converts linear reciprocating motion into circular motion through an internal mechanical structure, and then drives the mechanical roller counter to rotate through the circular motion; and when the diaphragm reciprocates once, a certain amount of gas is discharged, and finally the roller rotates through a counting unit, so that the roller rotation metering display effect is realized.

The mechanical transmission group is used for transmitting the movement of the inner core of the membrane type gas meter shell to the outside of the shell, and is linked with a gear train outside the shell and a character wheel assembly of the counter, so that the sealing reliability is ensured while the transmission movement is achieved.

However, in the existing mechanical transmission set, the connecting shaft and the shifting block are directly connected with the transmission shaft in an interference fit manner, and because the connecting shaft or the shifting block is stressed for a long time, after the mechanical transmission set is used for a long time, connection looseness between the connecting shaft or the shifting block and the transmission shaft is easy to occur, and finally, the situation that the connecting shaft or the shifting block falls off from the transmission shaft is caused, so that the reliability of the diaphragm gas meter in durable use is affected.

Based on the above, the applicant considers to design a mechanical transmission group of a membrane type gas meter with better anti-falling function and higher reliability.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to solve the technical problems that: how to provide a mechanical transmission group of a diaphragm gas meter with better anti-drop function and higher reliability.

In order to solve the technical problems, the invention adopts the following technical scheme:

the mechanical transmission group of the diaphragm gas meter comprises a shaft sleeve, a connecting shaft, a transmission shaft, a shifting block, an end cover and a leather cup;

the outer surface of the shaft sleeve is provided with a shaft sleeve assembling and fixing structure for fixing and mounting on the upper shell of the diaphragm gas meter; the transmission shaft is rotatably inserted in the shaft sleeve; the leather cup is sleeved on the transmission shaft and is positioned in the assembly cavity in the shaft sleeve and close to the transmission input end of the transmission shaft;

The two axial ends of the transmission shaft are respectively provided with a connecting section with knurling on the outer side, one of the two connecting sections is a transmission input section, and the other section is a transmission output section; the transmission input section is fixedly provided with the shifting block; the transmission output section is coaxially and fixedly provided with the connecting shaft, and the connecting shaft is used for sleeving a driving gear of the driving counter; the method is characterized in that:

annular grooves are formed in each connecting section of the transmission shaft; the inner side surfaces of the shifting block and the connecting shaft are respectively provided with an annular bulge which is clamped into the annular groove.

The mechanical transmission group has the advantages that:

Knurling interference riveting is adopted among the connecting shaft, the transmission shaft and the shifting block; meanwhile, after the annular protrusions clamped in the annular grooves are arranged on the inner side walls of the assembly holes of the connecting shaft and the shifting block, the anti-falling function can be remarkably enhanced; the structural strength of the connecting shaft and the shifting block (which are usually made of plastic materials) can be enhanced through the annular bulge, so that the reliability of the whole structure is better ensured.

Drawings

The prior art comprises the following steps:

fig. 1 is a schematic view of a conventional membrane gas meter (forward direction).

Fig. 2 is a schematic diagram of a conventional membrane gas meter (forward direction) after the counter cover is detached.

Fig. 3 is a schematic diagram of the structure of a conventional membrane gas meter after the counter is detached (forward direction).

Fig. 4 is a top view of the contents shown in fig. 3.

Fig. 5 is a schematic diagram of the structure of a conventional membrane gas meter after (reverse) detaching a counter.

Fig. 6 is a schematic structural view of a base plate in a conventional industrial diaphragm gas meter.

The technical scheme is as follows:

fig. 7 is a schematic structural diagram of a membrane gas meter (forward direction) according to the present embodiment.

Fig. 8 is a schematic structural view of the membrane gas meter according to the present embodiment after the counter cover is detached (forward direction).

Fig. 9 is a schematic diagram of the counter shown in fig. 8 after being detached.

Fig. 10 is a schematic view (rear view) of a counter frame in a membrane gas meter according to the present embodiment.

Fig. 11 is a schematic structural view (rear view direction) of the counter cover and the base plate in the membrane gas meter according to the present embodiment.

Fig. 12 is a schematic view (rear view) of the counter cover in fig. 11.

Fig. 13 is a schematic structural view (rear view direction, another view angle) of the counter cover in fig. 11.

Fig. 14 is an enlarged view of fig. 13 at I.

Fig. 15 is a schematic view (rear view) of the chassis of fig. 11.

Fig. 16 is a schematic structural view (front view) of the base plate according to the present embodiment.

Fig. 17 is a schematic structural view of an upper cover and a bottom plate in the membrane gas meter (forward direction) according to the present embodiment.

Fig. 18 is a schematic structural view of an upper cover and a bottom plate in the membrane gas meter (reverse direction) according to the present embodiment.

Fig. 19 is a schematic view (bottom view) of the upper cover of the membrane gas meter according to the present embodiment.

Fig. 20 is a schematic structural view of a mechanical transmission set (screw assembly) according to the present embodiment.

Fig. 21 is an exploded view of the mechanical transmission group according to the present embodiment.

Fig. 22 is a schematic structural diagram of a mechanical transmission set according to the present disclosure.

Fig. 23 is a cross-sectional view A-A of fig. 22.

Fig. 24 is a schematic structural view of a mechanical transmission set (rivet assembly) according to the present invention.

Marked in the figure as:

A counter:

110 counter rack: 1101 insert, 1102 insert post, 1103 connecting hole;

A 120-type wheel assembly;

130 a counter support;

140 counter cover: 1401 shows a window, 1402 a cylinder (14021 pressing surface), 1403 a snap-in rib, 1404 a clip, 1405 a pressing surface;

150, preventing cap disassembly;

200 bottom plate: 2001 inserting notch, 2002 threaded hole, 2003 main body part, 2004 welding hole, 2005 mechanical transmission perforation, 2006 assembling bulge, 2007 riveted fixed counter threaded column, 2008 square hole, 2009 round hole;

Upper cover of 300 diaphragm gas meter's casing: 3001 grooves for fitting, 3002 grooves for welding, 3003 kidney-shaped projections;

Mechanical transmission group of 400 diaphragm type gas table: 4001 shaft sleeve (cavity for 40011 assembly), 4002 connecting shaft, 4003 transmission shaft (40031 annular groove), 4004 shifting block, 4005 end cap (40051 outer ring, 40052 convex column, 40053 inner ring, 40054 annular groove), 4006 leather cup.

Detailed Description

The technical scheme is further described in detail below with reference to the accompanying drawings.

In the specific embodiment, the azimuth words "left" and "right" are that the human body faces to the left of the counter on the diaphragm gas meter and the left of the counter is "left" and the right of the counter is "right"; the azimuth words "upper" and "lower" are that the human body faces the upper part of the counter on the diaphragm gas meter and the lower part is "upper"; the front and the back are the counter on the diaphragm gas meter with the human body facing the diaphragm gas meter, the counter is the front on the side close to the human body, and the counter is the back on the side far away from the human body.

The diaphragm gas meter comprises a diaphragm gas meter counter structure, a diaphragm gas meter multipurpose bottom plate structure and a mechanical transmission group of the diaphragm gas meter.

As shown in fig. 7 to 16:

The counter structure of the diaphragm gas meter comprises a counter frame, and a character wheel assembly and a gear assembly which are rotatably arranged on the counter frame;

The left side edge of the counter frame is provided with a left side plug-in structure, and the right side edge of the counter frame is provided with a right side plug-in structure; the left side is used the cartridge structure and the right side is used the cartridge structure and is all used for realizing quick assembly with the jack cooperation that corresponds on the bottom plate.

Compared with the prior art, the membrane gas meter counter structure in the technical scheme has the advantages that:

1. After the counter bracket is integrated on the counter bracket, the counter bracket and the counter bracket are conveniently and rapidly manufactured by an injection molding process, so that the process that the counter bracket is independently manufactured and then is required to be arranged on a bottom plate is omitted;

meanwhile, the bottom plate has a simple structure, few processing steps and can be formed by stamping with a simple die; the bottom plate structure is simplified, the bottom plate machining and manufacturing procedures are reduced, the production efficiency is improved, and meanwhile, the cost is reduced.

2. The counter frame is integrally assembled with the bottom plate quickly through the plug-in mounting structures on the left side and the right side of the counter frame, so that the assembly efficiency and the assembly accuracy can be greatly improved, the alignment and the assembly difficulty between the counter frame and the bottom plate are simplified, and the automatic assembly line is easy to design to complete accurate, reliable and efficient automatic assembly.

3. After the counter support is integrally formed on the counter frame, the structure protruding out of the position of the base meter sealing ring is avoided, so that the situation that the appearance is damaged by scratching in the batch transportation process of the gas meter is avoided, and a better protection effect is achieved.

The left side plug-in structure comprises a plug-in block, and the plug-in block is bent outwards after being formed in a downward protruding mode on the left side square edge of the counter frame.

The insert block is of a bending structure, so that the insert block has higher structural strength.

Meanwhile, after the everting part of the inserting block is inserted into the corresponding jack on the bottom plate, the technical effects of easy insertion and buckling limiting (effectively avoiding falling out in the direction far away from the bottom plate) can be realized, and better orderly movement and positioning can be realized.

Wherein two inserts are arranged at intervals along the left side edge of the counter frame.

Two insert blocks are arranged, and buckling points are added, so that reliable connection and stable effect can be better ensured.

The right side plug-in mounting structure comprises a plug-in column, and the plug-in column is arranged on the right side edge of the counter frame and is in a downward convex shape.

The structure of the inserted column is easy to insert and tightly connect and position accurately, and the assembly precision of the counter frame is effectively ensured.

Wherein two of the posts are arranged at intervals along the right side edge of the counter frame.

Likewise, the strength and reliability of the counter rack right-side plug connection can be further improved by adopting the arrangement of two plug posts.

In practice, it is preferred that the individual posts and the individual blocks correspond in the same height direction of the counter rack.

Thus, the counter frame can be quickly turned down after the left side plug-in structure (plug-in block) is quickly and firstly inserted during assembly, and the right side plug-in structure (plug-in post) is quickly aligned and inserted.

The counter structure of the diaphragm gas meter further comprises a counter cover, the counter cover is integrally used for covering the counter frame, the left side of the counter cover can be connected with the left side edge of the bottom plate through a clamping structure in a clamping mode, and the right side of the counter cover is fixedly connected with the bottom plate through a screw.

Different from the structure that all need use the screw to realize the assembly fixed all around current counter cover, in this technical scheme, the counter cover left side is fixed through the joint, and only right side limit passes through the screw locking, can improve the assembly efficiency of counter cover like this.

The clamping structure comprises a notch for insertion, a convex strip for clamping and a clamping block;

The left side flanging edge of the bottom plate is provided with the notch for grafting;

The convex strip for clamping is arranged at the position below the left inner side surface of the counter cover and corresponding to the notch for plugging; the length direction of the clamping convex strip is consistent with the thickness direction of the counter cover, a pair of clamping blocks are fixedly arranged on the left inner side surface of the counter cover in an inward protruding mode along the position of the clamping convex strip, and the protruding direction of the pair of clamping blocks is parallel to the left side flanging of the bottom plate; the distance between the pair of clamping blocks is matched with the thickness of the left flanging of the bottom plate, and the clamping blocks are used for clamping and fixing the left flanging edge of the bottom plate after clamping.

The adoption of the buckle structure has the advantages that:

1. The protruding clamping convex strips and clamping blocks are arranged on the left inner side surface of the counter cover in a protruding mode, the reinforcing ribs function, and the structural strength of the left side surface of the counter cover is greatly improved.

2. After the clamping convex strip on the left inner side surface of the counter cover is inserted into the plugging notch on the bottom plate, the counter cover is locked in the up-down direction and the right direction; meanwhile, after a pair of clamping blocks are inserted into the left side edges of the bottom plate, the locking in the front-rear direction is realized.

Therefore, the buckle structure can enable the counter cover to be assembled with the bottom plate at the left side simply and conveniently.

In practice, it is preferable that two of the above-described snap structures are provided at a distance in the width direction between the left flange of the bottom plate and the left inner surface of the counter cover.

Therefore, the firmness of the assembly connection between the bottom plate and the left side of the counter cover can be improved, and the structural strength of the left side surface of the counter cover is further improved.

When the counter cover is implemented, the inner upper surface and the inner lower surface of the counter cover are respectively internally and convexly provided with a reinforcing rib structure, and the rear end surfaces of the reinforcing rib structures are flush and jointly form an abutting surface for being in fit connection with the upper flanging and the lower flanging of the bottom plate.

After adopting above-mentioned structure, not only can promote the holistic structural strength of counter cover, can also ensure the firm degree and the compactness of being connected between bottom plate and the counter cover.

Wherein the notch for insertion is a trapezoid notch with wide outer side and narrow inner side.

Above-mentioned trapezoidal breach can be directed the card and go into with the inserting of sand grip, helps its more quick insert and location, more easily realizes quick accurate assembly.

Wherein (see fig. 7, 8 and 11), a counter hole extending in the thickness direction is formed at the middle position of the right side of the counter cover in the height direction;

A connecting hole opposite to the counter hole is formed in the right side of the counter frame;

a threaded hole opposite to the connecting hole is formed in the right side edge of the bottom plate;

The threaded rod of the screw penetrates through the counter hole and the connecting hole and is connected in the threaded hole through threads, and the screw head of the screw abuts against the step surface of the counter hole to realize locking and fixing of the counter cover and the counter;

the counter cover is internally provided with a pressing surface for pressing the front end surface of the counter installation round hole, and the rear end surface of the counter installation round hole presses the right flanging of the bottom plate.

After adopting above-mentioned structure, can realize when the assembly:

The left side of the counter cover can be quickly clamped on the bottom plate to realize fastening; the right side of the counter cover can be quickly fixed by only using one screw, and the shell of the counter is fixed at the same time (after the screw is locked, an anti-disassembly cap is finally assembled in the counter hole).

Therefore, the counter cover and the counter frame are locked and fixed only by one screw, so that the assembly is more convenient and efficient, and the locking and fixing efficiency of the counter frame and the counter cover is obviously improved.

Wherein, a cylinder is formed on the right side of the counter cover, and the counter hole is arranged in the cylinder; the cylinder is provided with an inner end surface positioned inside the counter cover, and the inner end surface forms the pressing surface.

After the cylinder is designed, the cylinder has the advantages that:

1. The cylinder can play a role of reinforcing ribs, and the structural strength of the whole right side of the counter cover is improved;

2. The right flanging of the bottom plate can be abutted against the abutting surface of the cylinder, so that the counter cover can obtain better stabilizing and locking effects;

3. The counter bore and the pressing surface on the cylinder are designed to avoid the situation that the excessive screwing of the bolt head presses the step surface of the counter bore, so that a better protection effect is achieved.

When in implementation, the right side of the counter frame is provided with a hollowed-out structure for giving way to the cylindrical structure.

Therefore, the assembly and connection reliability is ensured, the use of materials can be reduced, the weight is reduced, and the comprehensive benefit is improved.

As shown in fig. 8, 9, 11, 15 and 16:

The multipurpose bottom plate structure of the diaphragm gas meter comprises a bottom plate, wherein the bottom plate comprises a main body part, the peripheral edge of the main body part is outwards turned to form a reinforcing flanging, and the main body part is provided with a plurality of welding holes and a through hole for mechanical transmission (or magnetic transmission) for penetrating through a connecting shaft of a mechanical transmission group (or a magnetic transmission group); the reinforcing turnup is provided with a threaded hole for fixedly connecting the counter cover; the method is characterized in that:

The bottom plate is a single galvanized steel sheet stamping part, and insertion holes for the counter frame to be inserted are respectively formed in the left side edge and the right side edge of the reinforcing flanging in a penetrating mode.

Compared with the prior art, the membrane type gas meter multipurpose bottom plate structure in the technical scheme has the advantages that:

The bottom plate structure is simpler, processing steps are fewer, and the bottom plate is formed by stamping with a simple die. The manufacturing cost is reduced while the production efficiency is remarkably improved.

Wherein, the jack on the left side of the reinforcing flanging is a square hole.

In practice, the square holes are preferably two spaced apart in the longitudinal direction of the left side of the reinforcing flange.

Wherein, the jack on the right side of the reinforcing flanging is a round hole.

In practice, it is preferable that the number of the round holes is two which are arranged at intervals in the length direction of the left side of the reinforcing flange.

The jack on the left side of the reinforcing flanging is a square hole, and the jack on the right side is a round hole, so that the false assembly can be avoided, and the assembly accuracy is effectively ensured.

Meanwhile, the square hole can be used for inserting the inserting block which is turned outwards after the left side square edge of the counter frame is formed in a downward protruding mode, the counter frame can still rotate, and the inserting column which is formed in the downward protruding mode on the left side square edge of the counter frame can be aligned conveniently and inserted into the round hole to finish assembly.

In implementation, the square holes and the round holes are preferably opposite to each other in the same height direction of the bottom plate.

Therefore, the bearing force of the counter frame assembled on the bottom plate is distributed more uniformly, and the bearing stabilizing effect is more reliable.

Wherein the mechanical drive through hole is an elongated kidney-shaped hole extending transversely along the main body portion of the base plate.

At present, the output position of the forward and reverse movement of the (household) diaphragm gas meter is not centered, the forward direction is deviated to the right (see fig. 3), the reverse direction is deviated to the left (see fig. 5), and the installation position of the bottom plate on the upper cover of the shell of the gas meter is also inconsistent, so that the forward and reverse movement of the base of the intelligent product control box cannot be shared at all, and the assembly automation is difficult to realize due to inconsistent positions.

After the waist-shaped hole is adopted, the weight of the bottom plate can be reduced, the waist-shaped hole can be used for allowing mechanical transmission groups on membrane gas meters of various types to pass out, the problem of eccentricity of output positions of the movement of the forward and reverse meters is solved, the installation positions of the bottom plate on the upper covers of the gas meter shells of different types are consistent, the universality of the control box base used by intelligent products in the later stage is ensured, and the membrane gas meters of different types (on the same automatic assembly line) are more convenient to realize automatic assembly.

That is, after adopting this technical scheme, through the structural design of a bottom plate, can compatible domestic diaphragm type gas table and industry diaphragm type gas table and the gas table of multiple different specification models, have the cost lower, the commonality is better, can reduce the design degree of difficulty and the advantage of implementation cost of automatic assembly line, and the comprehensive benefits is showing.

The main body part of the bottom plate is provided with an assembly protrusion at the right outer side of the kidney-shaped hole, the assembly protrusion is integrally in a strip shape, and the strip shape is bent downwards to the position adjacent to the lower side edge of the kidney-shaped hole after transversely extending from the position higher than the upper side edge of the kidney-shaped hole;

the highest surface of the assembling protrusion in the height direction of the protrusion is a plane parallel to the main body part of the bottom plate, and a positioning jack is arranged on the assembling protrusion at a position close to the lower end.

The assembling bulge is not only bent, but also has stronger structural strength; the reinforcing rib can also be used for improving the structural strength of the main body part of the bottom plate;

in addition, the blocking surface can be formed by the outer surface of the protruding transverse section for assembly, and the backward travel of one end, far away from the counter frame, of the speed regulating gear on the counter is blocked, so that the reliability of assembly and lasting use of the speed regulating gear is ensured.

The positioning jack on the assembly protrusion is used for being inserted into one end, far away from the counter frame, of the worm shaft in the gear assembly for driving the character wheel assembly to rotate, so that the position of the shaft is better ensured, the gear sleeved on the shaft is meshed with other gear trains, and the reliable motion transmission is ensured.

The threaded hole for fixedly connecting the counter cover on the reinforcing flanging is a single threaded hole arranged in the middle of the length direction of the right side edge of the reinforcing flanging.

After the membrane gas meter counter structure and the membrane gas meter multipurpose bottom plate structure are adopted, the left side support of the counter is arranged in the corresponding hole of the bottom plate, the hole is arranged on the plane of the bottom plate and has a slightly larger size than the counter support, the counter is convenient to be arranged, the counter is turned down properly, the right side counter cylinder is aligned with the round hole of the bottom plate, and the counter cover is assembled and then fixed by a screw (such as M3).

The manufacturing of the counter rack and the base plate, respectively, is simplified and the assembly of the two becomes more efficient.

Wherein, four angles of the reinforcing flanging are respectively provided with a threaded bottom hole.

4 Screw thread bottom holes are reserved in 4 angles, and the outlet wire mounting position of the intelligent meter valve is reserved, so that the mounting and fixing of the base of the intelligent product control box in the later stage are facilitated.

As shown in fig. 19, the outer side surface of the upper cover of the housing of the diaphragm gas meter is provided with an assembly groove which is concave and into which the main body part of the bottom plate falls, and the groove body of the assembly groove is provided with a welding groove corresponding to each welding hole on the bottom plate.

After the upper cover structure is adopted, the overall strength of the upper cover structure is higher;

And moreover, more welding flux can be contained between the welding flux and the bottom plate, so that the welding connection strength and reliability of the welding spot position are improved, and the bottom plate has more durable, stable and reliable assembly quality.

When the method is implemented, the bottom plate is connected with the upper cover, the upper cover is adopted to correspond to the welding column with the hollow welding in the groove, the bottom plate is sleeved on the welding column and then riveted, 4 points are arranged at the positions of 4 angles, the same positions can be used for riveting in the later period, and the spot welding column and the riveting procedure are canceled.

As shown in fig. 18 and 19, a waist-shaped protrusion is arranged at the bottom of the assembly groove, the waist-shaped protrusion is opposite to a waist-shaped hole formed on the bottom plate and used for the mechanical transmission group to penetrate out, and the outer protrusion can be integrally inserted into the waist-shaped hole.

The waist-shaped bulges can also improve the structural strength of the waist-shaped bulges; the waist-shaped bulge also forms an installation position of the mechanical transmission group, and the occupation space required by arranging the mechanical transmission group in the gas meter shell can be reduced by utilizing the outer bulge of the waist-shaped bulge, thereby helping to optimize the space layout and space utilization of various parts in the gas meter shell.

As shown in fig. 20 to 24:

The two axial ends of the transmission shaft are respectively provided with a connecting section with knurling on the outer side, one of the two connecting sections is a transmission input section, and the other section is a transmission output section; the transmission input section is fixedly provided with the shifting block; the transmission output section is coaxially and fixedly provided with the connecting shaft, and the connecting shaft is used for sleeving a driving gear of the driving counter;

The mechanical transmission group has the advantages that:

When implementing, axle sleeve assembly fixed knot constructs: the sleeve is fixed on the gas meter shell in a riveting (shown in fig. 23) or threaded connection (shown in fig. 19-22) mode, the sleeve and the shell are sealed in a sealing gasket or O-shaped sealing ring mode, the end face of a circle of annular boss on the outer side of the sleeve is a plane sealing surface, and grooves are not needed to be arranged. The O-shaped sealing ring is adopted for sealing, a groove is arranged on the end face of a circle of annular boss on the outer side of the shaft sleeve, and the O-shaped sealing ring is arranged in the groove, so that the sealing reliability is effectively ensured.

The shaft sleeve can be made of copper alloy, aluminum alloy, surface anodic oxidation, plastics and other materials.

Wherein the transmission shaft is in mirror symmetry about a center position perpendicular to the axial length direction.

Therefore, the transmission shaft is symmetrically designed, so that false assembly is effectively avoided, and correct assembly is ensured.

In practice, the connecting shaft can be made of stainless steel materials.

When the connecting shaft is in implementation, the connecting shaft is in interference fit connection with the connecting shaft. It is also possible to use:

the connecting shaft is made of plastic materials, and the transmission shaft is embedded into a forming die of the connecting shaft to form assembly connection during injection molding of the connecting shaft.

Therefore, the transmission output section of the transmission shaft is more tightly connected with the connecting shaft, the firmness and the lasting reliability of the connection between the connecting shaft and the transmission shaft are further improved, and the reliability is optimal. The knurling interference riveting (better knurling riveting manufacturability and low cost) is preferably used, the injection molding embedding is another usable form, and the anti-falling blocking can be added to the grooves on the transmission shaft and the bosses on the connecting shaft and the deflector rod.

The poking block is any one of a double poking plate or a four poking plate with a single poking plate and uniformly arranged at intervals in the circumferential direction. This embodiment shows a dial having four dials.

The shifting block is usually made of plastic materials, is riveted at one end of a transmission shaft and is in transmission connection with an output crank in the movement. The plectrum at the plectrum tail end can be single plectrum, two plectrums and four plectrums, and the crank radius of plectrum can be big or small and the plectrum height can be high or low, can be better suitable for the gas phenotype of different space sizes.

Wherein, the whole cylindrical structure of said end cover, the inside runs through and is provided with the through hole that the drive shaft runs through;

The outer side of one axial end of the end cover is outwards protruded to form a circle of outer ring for lap joint limiting;

The circumferential outer side surface of the end cover is provided with convex columns extending along the axial direction, and a plurality of convex columns are arranged at intervals in the circumferential direction of the end cover.

By adopting the arrangement of the end cover, the cup for sealing can be effectively and reliably prevented from falling off;

Meanwhile, the convex columns on the outer side surface of the end cover can play a role in reinforcing the structural strength of the end cover by the reinforcing ribs; and through this projection coming the surplus assembly on the axle sleeve, can make the end cover obtain more firm reliable assembly effect.

In practice, the end caps may be made of plastic.

The inner side surface of the end cover is internally and convexly provided with a circle of inner circular ring, and the inner side surface of the inner circular ring is connected with the surface of the transmission shaft in a sliding fit manner.

After adopting above-mentioned structure, the end cover can form bearing cooperation through interior ring and transmission shaft, better keep transmission shaft and axle sleeve hole concentric, lasting effective assurance transmission shaft's operation steady.

The middle part of the end face of the end cover where the outer ring is located is concavely formed with a circular groove which surrounds the through hole and can enable a part of the deflector rod to fall into.

Therefore, the extension length of the deflector rod in the shell can be shortened, the occupied space is reduced, and the compactness of the mechanical transmission set is improved; and after the transmission shaft is assembled, a proper movable gap is formed in the axial direction, so that the rotation flexibility is ensured more permanently and reliably.

When the end cover is implemented, the end face, far away from the outer ring, of the end cover is an inserting end with a guide angle at the outer side edge.

Therefore, the plug-in end of the end cover can be inserted into the shaft sleeve more easily to complete assembly.

Wherein the leather cup is made of rubber materials; the whole leather cup is of a circular ring structure, and the section of the leather cup in the annular direction perpendicular to the circular ring is of a V-shaped structure; the pressure of the rubber cup V-shaped structure in the diaphragm gas meter is larger than the external pressure, and the pressure acts on the rubber cup, so that the sealing is facilitated, and the sealing reliability is ensured;

The radial inner side surface of the circular ring-shaped structure of the leather cup is integrally a cone-shaped surface, the small-caliber end of the cone-shaped surface can be abutted against the surface of the transmission shaft, and the large-caliber end of the cone-shaped surface is abutted against the end surface of the assembly cavity of the shaft sleeve.

The section of the leather cup is of a V-shaped structure, so that the air pressure can fully act on each inner side surface of the V-shaped structure, and further, each outer side surface of the V-shaped structure can form more full tight pressing contact with an adjacent contact surface, the sealing reliability when bearing the air pressure is ensured, and meanwhile, the flexible rotation of the transmission shaft is ensured.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements made by those skilled in the art without departing from the present technical solution shall be considered as falling within the scope of the claims.

Claims

1. The mechanical transmission group of the diaphragm gas meter comprises a shaft sleeve, a connecting shaft, a transmission shaft, a shifting block, an end cover and a leather cup;

annular grooves are formed in each connecting section of the transmission shaft; the inner side surfaces of the shifting block and the connecting shaft are respectively provided with an annular bulge which is clamped into the annular groove;

The end cover is of an integral cylindrical structure, and a through hole for the transmission shaft to penetrate is formed in the end cover in a penetrating manner;

The circumferential outer side surface of the end cover is provided with convex columns extending along the axial direction, and a plurality of convex columns are arranged at intervals in the circumferential direction of the end cover;

the inner side surface of the end cover is internally convex to form a circle of inner circular ring, and the inner side surface of the inner circular ring is connected with the surface of the transmission shaft in a sliding fit manner;

the middle part of the end face of the end cover where the outer ring is positioned is concavely formed with a circular groove which surrounds the through hole and can be used for the part of the deflector rod to fall into;

The leather cup is made of rubber materials; the whole leather cup is of a circular ring structure, and the section of the leather cup in the annular direction perpendicular to the circular ring is of a V-shaped structure; the pressure of the rubber cup V-shaped structure in the diaphragm gas meter is larger than the external pressure, and the pressure acts on the rubber cup, so that the sealing is facilitated, and the sealing reliability is ensured;

2. The mechanical transmission set of a diaphragm gas meter of claim 1, wherein: the transmission shaft is in mirror symmetry about a center position perpendicular to the axial length direction.

3. The mechanical transmission set of a diaphragm gas meter of claim 1, wherein: the connecting shaft is in interference riveting with the transmission shaft.

4. The mechanical transmission set of a diaphragm gas meter of claim 1, wherein: the connecting shaft is made of plastic materials, and the transmission shaft is embedded into a forming die of the connecting shaft to form assembly connection during injection molding of the connecting shaft.

5. The mechanical transmission set of a diaphragm gas meter of claim 1, wherein: the poking block is any one of a double poking plate or a four poking plate with a single poking plate and uniformly arranged at intervals in the circumferential direction.

6. Diaphragm type gas table, its characterized in that: a mechanical drive train comprising a diaphragm gas meter according to any one of claims 1 to 5.