阅读说明：本技术 一种新型膜式燃气表机芯结构 (Novel core structure of diaphragm type gas meter ) 是由 曾志鸿 刘显峰 刘晓阳 张军 陈绩 于 2020-11-20 设计创作，主要内容包括：本发明涉及计量仪表领域,具体公开了一种新型膜式燃气表机芯结构,包括机芯体、计量壳以及用于支撑机芯体的支撑结构,所述支撑结构包括分别可拆卸设置在机芯体两个短边的两个支架,支架上于机芯体两个长边均设置有支撑位,且支架上于机芯体两个短边设有用于限制机芯体沿其长边移位的支撑筋位。本发明采用四角上的四点支撑,机芯支撑更可靠,可以防止机芯各个方向上的歪斜,侧面的支撑筋位消除了原本机芯体左右两侧的空隙,防止机芯体受冲击时的左右晃动。(The invention relates to the field of metering instruments, and particularly discloses a novel core structure of a membrane type gas meter, which comprises a core body, a metering shell and a supporting structure for supporting the core body, wherein the supporting structure comprises two supports which are respectively detachably arranged on two short sides of the core body, supporting positions are respectively arranged on the two long sides of the core body on the supports, and supporting rib positions for limiting the core body to move along the long sides of the core body are arranged on the two short sides of the core body on the supports. The four-point support on the four corners is adopted, the movement support is more reliable, the movement can be prevented from being inclined in all directions, gaps on the left side and the right side of the original movement body are eliminated by the support rib positions on the side faces, and the movement body is prevented from shaking left and right when being impacted.)

1. The utility model provides a novel diaphragm type gas table core structure, includes the core body, measures the shell and is used for supporting the bearing structure of core body, a serial communication port, bearing structure is including dismantling two supports that set up two minor faces at the core body respectively, all is provided with the support position in two long limits of core body on the support, and is equipped with the support muscle position that is used for restricting core body along its long limit aversion in two minor faces of core body on the support.

2. The novel core structure of a diaphragm gas meter as claimed in claim 2, wherein the metering shells are provided with flanging holes protruding from the surface of the metering shell, the supports are provided with support grooves into which the flanging holes are clamped, and the flanging holes are clamped into the support grooves to realize the connection and fixation between the core body and the supports.

3. A novel diaphragm gas meter movement structure as claimed in claim 3, wherein the supports are provided with limit grooves matched with the edges of the metering shell, and the edges of the metering shell are clamped in the limit grooves of the supports.

4. The novel diaphragm gas meter movement structure as claimed in claim 3, wherein the supports are made of PP (polypropylene) materials, the movement body is made of modified PBT (polybutylene terephthalate) materials, and the proportion of glass fibers in the modified PBT materials is 15% -35%.

5. The novel diaphragm gas meter movement structure according to any one of claims 1 to 4, wherein the movement structure further comprises a center shaft and a center shaft support pillar sleeved outside the center shaft, the bottom of the center shaft support pillar is located above the gas outlet flow passage, and the bottom of the center shaft is located above the bottom of the center shaft support pillar.

6. The novel diaphragm gas meter movement structure as claimed in any one of claims 5, wherein the movement body is provided with a reinforcing rib on the periphery of the center shaft supporting column.

7. A novel diaphragm gas meter movement structure according to any one of claims 1 to 4, characterized in that the movement structure further comprises an output structure, the output structure comprises a support group and a plurality of bearing seats for supporting the support group, the support group comprises an output wheel and a bearing assembly of the output wheel, and the output wheel is connected with an anti-reverse device for preventing the output wheel from reversing.

8. The novel diaphragm gas meter movement structure according to claim 7, wherein the anti-reverse device comprises an anti-reverse block, one end of the anti-reverse block is movably connected to the bearing assembly, a reverse buckle is arranged at the bottom of the anti-reverse block, an anti-reverse through hole is formed in the top of the bearing assembly, the reverse buckle of the anti-reverse block passes through the anti-reverse through hole and abuts against the outer surface of the output wheel, and an anti-reverse clamping position capable of being clamped with the reverse buckle of the anti-reverse block in a single direction is further arranged on the outer surface of the output wheel.

9. A novel diaphragm gas meter movement structure as claimed in claim 8, wherein the bearing assembly is provided with an upper semicircular bearing surface, the bearing seat is arranged on the valve gate, the bearing seat is provided with a lower semicircular bearing surface, the upper semicircular bearing surface and the lower semicircular bearing surface are involuted to form a complete bearing surface, and the bearing surface is sleeved on the shaft of the output wheel.

10. The novel diaphragm gas meter movement structure as claimed in claim 9, wherein the bearing assembly is provided with a connecting portion, the connecting portion is provided with an installation buckle inwards, the connection and fixation between the bearing assembly and the bearing seat are realized through the buckling between the installation buckle and the bottom of the bearing seat, a protruding portion is arranged on the side surface of the bearing seat, an anti-falling protrusion is arranged on the side surface of the connecting portion of the bearing assembly, and the anti-falling protrusion abuts against the side surface of the protruding portion of the bearing seat.

Technical Field

The invention belongs to the technical field of metering instruments, and particularly relates to a novel core structure of a diaphragm type gas meter.

Background

Along with the increasing demand of the modern society on the consumption of gas, the gas trading volume increases, and the demand of gas table also increases more and more. The diaphragm gas meter is a volumetric flowmeter with large usage amount and wide application range, has the history of nearly 200 years, is improved and enhanced by the inheritance of several generations of people, and is widely used up to now. The diaphragm type gas meter plays an important role in gas metering and settlement, and the metering precision and the metering stability of the diaphragm type gas meter directly influence the fairness of trade settlement.

The movement of the diaphragm gas meter is a core part for metering and mainly comprises the following three parts: (1) a metering system: the two metering chambers are basically the same and are composed of a metering shell, a diaphragm, parallel plates, a folded plate sleeve and a folded plate shaft, and the function of the two metering chambers is to ensure that the diaphragm swings in a circle in a reciprocating manner and has a constant volume of gas output. (2) Gas circuit and gas circuit distribution system: the gas metering valve consists of parts such as a gas outlet flow channel, a valve gate, a valve cover and the like, and is mainly used for allowing gas to be metered to flow through channels in a certain sequence. (3) A motion transmission system: the device is composed of a middle shaft support group, a vertical shaft, a large pull rod and a small pull rod, and has two functions, namely, energy transmission, the action of gas pressure on a diaphragm to form power for the diaphragm to swing, a transmission system transmits the power to a valve cover to perform linear sliding (or rotation, fan-shaped swing and the like), and simultaneously, the transmission system also transmits the power to a cumulative number display system to enable gears (or character wheels) of a counter to rotate so as to achieve the purpose of metering display, and the motion form is changed, wherein the motion form of a movable piece in the counter comprises rotation, linear sliding, fan-shaped swing and the like, and the motion forms are achieved by connecting rod hinges in the transmission system.

The attached figure 1 shows a machine core structure of an existing gas meter, in a drop-resistant specification of a standard GB/T6968 membrane gas meter, the gas meter is definitely required to be kept at an upright position (in a horizontal plane) under the condition of no package, the gas meter vertically drops onto a flat and hard horizontal surface from a static state with the height of 0.5 meter, and the metering error, the pressure loss and the sealing performance of the gas meter after a drop test meet the requirements. The gas meter may also be subjected to strong impact during actual transportation and handling.

The fixation and the positioning of the movement group in the watch are completely dependent on the clips on the movement body, and the clips of the movement body bear the gravity and the impact force of the whole movement group and the valve in the use process. However, the existing core body clip structure cannot completely limit the displacement of the core group in all directions, so that the core group is skewed when the core group is impacted.

In addition, for the mechanical temperature compensation diaphragm gas meter, the inventor finds that the key size of the machine core group part is influenced by temperature to change in the production test process, and influences the metering accuracy of the mechanical temperature compensation base meter in the high and low temperature environment to a certain extent.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a novel core structure of a diaphragm gas meter so as to solve the problem that the core group is easy to be inclined when being impacted due to insufficient support capacity of a core body clamp at present.

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

the utility model provides a novel diaphragm type gas table core structure, includes core, measurement shell and is used for supporting the bearing structure of core, bearing structure is including dismantling two supports that set up two minor faces at the core respectively, all is provided with the support position in two long limits of core on the support, and is equipped with the support rib position that is used for restricting core along its long limit aversion in two minor faces of core on the support.

Furthermore, all be equipped with the turn-ups hole of protrusion in measurement shell surface on the measurement shell, all be equipped with the support groove that supplies turn-ups hole card to go into on the support, go into the support inslot through the turn-ups hole card and realize being connected fixedly between refill body and the support.

Furthermore, the support all is equipped with the spacing groove with the edge complex of measurement shell, and the edge card of measurement shell is in the spacing groove of support.

Furthermore, the supports are all made of PP materials, the core body is made of modified PBT materials, and the proportion of glass fibers in the modified PBT materials is 15% -35%.

Furthermore, the movement structure also comprises a middle shaft and a middle shaft supporting column sleeved outside the middle shaft, the bottom of the middle shaft supporting column is positioned above the air outlet flow passage, and the bottom of the middle shaft is positioned above the bottom of the middle shaft supporting column.

Furthermore, the core body is provided with reinforcing ribs on the periphery of the center shaft supporting column.

Further, the core structure still includes output structure, output structure includes the bearing frame that support group and a plurality of are used for supporting the support group, support group is including the bearing assembly of output wheel and output wheel, the output wheel even has the anti-reversing device who is used for preventing its reversal.

Furthermore, prevent reversing device including preventing contrary piece, prevent against contrary piece one end swing joint on the bearing assembly, prevent against contrary piece bottom and be equipped with the turn-buckle, open at the bearing assembly top has prevents against contrary through-hole, prevents against the turn-buckle of piece and passes behind preventing against contrary through-hole butt at the surface of output wheel, and the surface of output wheel still is equipped with can with prevent the anti-reverse screens of the one-way block of turn-buckle of contrary piece.

Further, an upper semicircular bearing surface is arranged on the bearing assembly, the bearing seat is arranged on the valve gate, a lower semicircular bearing surface is arranged on the bearing seat, the upper semicircular bearing surface and the lower semicircular bearing surface are combined to form a complete bearing surface, and the bearing surface is sleeved on the shaft of the output wheel.

Further, the bearing assembly is provided with a connecting portion, the connecting portion is internally provided with an installation buckle, the connection between the bearing assembly and the bearing seat is realized and fixed through the buckling between the installation buckle and the bottom of the bearing seat, the side face of the bearing seat is provided with a convex portion, the side face of the connecting portion of the bearing assembly is provided with an anti-falling bulge, and the anti-falling bulge is tightly abutted to the side face of the convex portion of the bearing seat.

The invention has the beneficial effects that:

1. improve the material and the structure of movement body bearing structure, strengthen the supporting effect of movement body:

(1) the original machine core body and the supporting structure are integrally formed and improved to be arranged in a mode that the machine core body and the supporting structure are separated, so that the machine core body and the supporting structure can be made of different materials, and the purpose of enhancing the thermal stability of the machine core structure and enhancing the shock resistance of the machine core body is finally achieved.

(2) The four-point support on the four corners replaces the original left and right two-point support, the movement support is more reliable, the deflection of the movement in all directions can be prevented, the gaps on the left and right sides of the original movement body are eliminated by the support rib positions on the side faces, and the movement body is prevented from shaking left and right when being impacted.

(3) The support is connected the support that realizes the locomotive body with the measurement shell, and the measurement shell is metal material, is connected original checkpost and plastic materials's locomotive body and improves to be connected with the measurement shell of metal, and joint strength is higher, and consequently the bearing structure after optimizing is stronger than original to the support effect of locomotive body.

(4) The thickness of the sealed face of the movement body of checkpost on the original movement body and movement body junction is thicker than the sealed face thickness of the movement body of other positions departments, can lead to there being certain shrink circumstances behind the sealed face shaping of the movement body here, the sealed face of the movement body that has avoided original checkpost to arouse from the technology also to the structure of the checkpost on the original movement body of core after the optimization has avoided shrinking on the sealed face of the movement body, the manufacturability of part manufacturing is better, the risk of movement group gas leakage has also been avoided simultaneously.

2. Improve axis and well bearing structure, reduce the pressure loss of the runner of giving vent to anger:

the middle shaft mounting position is raised, the part of a middle shaft support in the original flow channel is cancelled, the air outlet flow channel position of the machine core is vacated, no flow-blocking barrier exists in the air outlet flow channel of the machine core, and the air pressure loss can be reduced.

3. Improve the structure of support group, make support group structure obtain simplifying to simplify production technology, and the setting of anti-reversion device has the effect of preventing the reverse rotation of output wheel:

(1) the integral bearing assembly structure in the original bearing group is improved into a split bearing assembly structure, a bearing for supporting the output wheel is composed of a bearing assembly and two bearing surfaces of a bearing seat, the output wheel is improved into the integral structure from the original split structure,

(2) when the output wheel rotates forwards, the anti-reverse block depends on the self gravity, the left-hand thread at the front end of the anti-reverse block is always attached to the shaft of the output wheel, and the output wheel can rotate smoothly; when the output wheel rotates reversely, the anti-reverse blocking position on the output wheel is meshed with the reverse buckle on the anti-reverse block, and the two parts are buckled more and more tightly due to the self-locking inclined plane formed between the two parts, so that the anti-reverse function is achieved.

Drawings

Fig. 1 is a structure diagram of a conventional gas meter movement.

Fig. 2 is a structural view of the core body of fig. 1.

Figure 3 is a top view of figure 2 with the bottom bracket and bottom bracket support post added.

Fig. 4 is a sectional view taken along line B-B in fig. 3.

Fig. 5 is a sectional view taken along line a-a in fig. 3.

Fig. 6 is a structure view of the movement of the present invention.

Fig. 7 is a top view of fig. 6.

Fig. 8 is a structural view of the core body of fig. 6.

Fig. 9 is a view of fig. 6 with two brackets removed.

Fig. 10 is an enlarged view of the burring hole of fig. 9.

Fig. 11 is a structural view of the stent of fig. 6.

Fig. 12 is a view showing the reverse side of fig. 11.

Fig. 13 is a top view of fig. 8.

Fig. 14 is a cross-sectional view C-C of fig. 13.

Fig. 15 is a cross-sectional view taken along line D-D of fig. 13.

Fig. 16 is a schematic view of an installation structure of a conventional stand group.

FIG. 17 is an enlarged view of the valve gate and seat set of FIG. 16.

Fig. 18 is a structural view of the valve gate of fig. 17.

Fig. 19 is a structural view of the stand group in fig. 2.

Fig. 20 is a block diagram of the bearing assembly of fig. 4.

Fig. 21 is a structural view of the output wheel of fig. 4.

Fig. 22 is an axial cross-sectional view of fig. 6.

Fig. 23 is a schematic view of an installation structure of the stand set of the present invention.

FIG. 24 is an enlarged view of the valve gate and seat set of FIG. 8.

Fig. 25 is a structural view of the valve gate of fig. 9.

Fig. 26 is a block diagram of the stand set of fig. 9.

Fig. 27 is a structural view of the bearing assembly of fig. 11.

Fig. 28 is a structural view of the output wheel of fig. 11.

Fig. 29 is a structural view of the check block of fig. 11.

Fig. 30 is a front view of fig. 12.

Fig. 31 is a cross-sectional view of fig. 11.

Fig. 32 is an axial cross-sectional view of fig. 13.

Wherein the reference numerals include:

the core body comprises a core body 1, a core body sealing surface 100, a metering shell 2, a flanging hole 200, a clip 3, a clip elongated body 30, a center shaft 4, a center shaft supporting column 40, a reinforcing rib 400, an air outlet flow channel 5, a support 6, a supporting position 600, a supporting rib position 61, a supporting groove 62, a limiting groove 63, a valve gate 7, a bearing seat 8, a lower semicircular bearing surface 80, a protruding part 81, a support group 9, a bearing assembly 91, a supporting block 911, a door-shaped frame 912, an anti-reverse block mounting position 9121, a mounting buckle 913, a connecting part 914, an anti-release protrusion 915, an anti-reverse through hole 916, a limiting baffle 917, an output wheel 92, a first component 921, a second component 922, an anti-reverse clamping 923, an anti-reverse block 93, a counterweight end 931, a mounting end 932, a mounting groove 9321 and.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Compared with the original movement structure, the invention mainly has three improvements, in order to better understand the innovation point of the invention, the embodiment only introduces the improvements, the rest of the movement structure is the same as the original structure, and is not repeated here, and each improvement is introduced one by one:

the improvement point is as follows: improvement of support structure for supporting machine core body 1

(1) Improvement in structure

Fig. 1-2 show an original movement structure, and it can be seen that the original movement structure includes a movement body 1, two measuring cases 2 and a supporting structure for supporting the movement body 1, the supporting structure includes clips 3 respectively located on two short edges of the movement body 1, the clips 3 are integrally injection-molded with the movement body 1 (the clip extension body 30 in fig. 1 is used for extending the length of the clips 3 to meet the requirement of supporting the movement body 1 in different gas meters).

Fig. 6 to 12 show an improved movement structure, and it can be seen that the improved movement structure includes a movement body 1, two metering shells 2 and a supporting structure for supporting the movement body 1, the supporting structure includes two supports 6 detachably disposed on two short sides of the movement body 1, and the structures of the left and right supports 6 are the same. All be provided with support position 600 on two long limits of the core body 1 on the support 6, and be equipped with the support rib position 61 that is used for restricting core body 1 along its long limit (along the X direction) aversion in two minor faces of core body 1 on the support 6, during the installation, support rib position 61 offsets with the shell inside wall of gas table to restriction core body 1 is at the ascending aversion of X direction. The detachable connection mode between the machine core body 1 and the bracket 6 is as follows: as shown in fig. 9 and 10, the metering shell 2 is integrally formed with a flanged hole 200 protruding from the surface of the metering shell 2, as shown in fig. 11 and 12, the brackets 6 are respectively provided with a U-shaped supporting groove 62 for the flanged hole 200 to be inserted, and the flanged hole 200 is inserted into the supporting groove 62 to fix the core body 1 and the bracket 6. In order to enable the support 6 to better wrap the edges of the machine core body 1 and the metering shell body 2, the support 6 is provided with limit grooves 63 matched with the edges of the metering shell body 2 and the machine core body 1, the edges of the metering shell body 2 and the machine core body 1 are clamped in the limit grooves 63 of the support 6, the limit grooves 63 are fixed on the inner side of the supporting groove 62, the edges of the metering shell body 2 and the machine core body 1 are wrapped in the four limit grooves 63 of the two support 6, and the metering shell body 2 and the machine core body 1 are better protected.

Because former core checkpost 3 is installed in the recess on the gas meter case, checkpost 3 is less with groove area of contact, and core group still has a less displacement in the X direction, can not restrict the ascending displacement of core group in the X direction completely, can restrict the ascending displacement of core group in the X direction completely through support rib position 61 in the bearing structure after optimizing to can restrict the ascending displacement of core group in the Y direction through four support positions 600.

It can be seen that the original movement catch structure restricts movement of the movement set in the X and Z directions within the housing (displacement in the X direction is not completely restricted), but the optimized movement set structure can completely restrict displacement of the movement set X, Y, Z in all three directions. Even if the movement set is impacted by strong magnetism or in a single direction, the movement set is not inclined, the matching and transmission of the output crank and the magnetic transmission are more reliable, and the situation that the original magnetic transmission can not sample can not occur any more.

(2) Improvements in materials

1) Core material selection

The machine core body 1 is used as the most important base part of the machine core group, and a plurality of assembly positioning benchmarks are distributed on the machine core body, so that the accuracy of the transmission and the air distribution mechanism of the machine core group is directly influenced. Under the influence of temperature, the reference sizes are changed, so that a transmission size chain of a transmission mechanism of the machine core group is changed, and the metering transmission is not accurate any more. The original machine core body 1 is formed by injection molding of POM material, and the POM has hardness, strength and rigidity similar to those of metals but has low heat resistance. In order to improve the thermal stability of the machine core body 1 and improve the product quality, the invention selects a modified PBT material (PBT for short) with similar price and mechanical property and better thermal stability to replace the machine core body 1 material, and the modified PBT material adopts reinforcement modification, namely glass fiber is added into the PBT material, wherein the proportion of the glass fiber is 15-35%. The physical properties of the two materials are shown in table 1:

TABLE 1 physical Properties of the materials

From the material property table, it can be known that the PBT material has lower water absorption, higher tensile modulus and bending stress and better thermal stability compared with the POM, so that the part made of the PBT material under the same use condition has better dimensional stability and the part dimension is less influenced by temperature. But the tensile strain of PBT material is much lower than POM, which makes the material more brittle and more prone to fracture upon impact.

After the POM is changed into the PBT, through high-temperature and low-temperature aging experiments, the change rate of the center distance of the rocker arm is reduced by 31.7%, the change rate of the center distance of the control rod is reduced by 35.4%, the change rate of the long side of the diaphragm hanging point is reduced by 90.5%, and the change rate of the short side of the diaphragm hanging point is reduced by 91.2%. After the experiment contrast test shows that the material of the machine core body 1 is changed into PBT, the change rate of the key size before and after the high and low temperature aging experiment is greatly improved, so that the thermal stability of the machine core structure is greatly improved.

2) Selecting the material of the bracket 6:

the clip 3 before modification is integrally formed with the core body 1, that is, the material of the clip 3 before modification is also POM.

The improved support 6 is made of a PP material, the PP material has strong toughness, and the gas meter can provide enough buffering when being impacted to relieve the instantaneous impact force.

(3) Impact resistance analysis

When the gas meter is impacted, impact force is respectively distributed to the supporting structures of the machine core body 1, the front two optimized clamps 3 respectively bear the impact force of 1/2, the machine core group is supported by four supporting positions 600 after the structure optimization, and each supporting position 600 bears 1/4 of the impact force. The stress of the clip structure of the original core is concentrated at the position of the clip 3, the risk of breaking the clip 3 is high when the impact is received, the stress distribution of 600 of each supporting position of the optimized independent clip 3 is uniform, and the stress concentration is not obvious. Since the bracket 6 is made of a more ductile PP material with less impact force per support site 600, the bracket 6 has little risk of breaking when subjected to impact.

Support structure after the improvement for support structure before improving, its advantage lies in: 1. improve original movement 1 and bearing structure integrated into one piece for movement 1 and bearing structure components of a whole that can function independently setting, consequently movement 1 and bearing structure can adopt different kinds of materials, strengthen the purpose of movement 1 shock resistance when finally reaching reinforcing movement structure thermal stability. 2. The four-point support on the four corners replaces the original left and right two-point support, the movement support is more reliable, the deviation of the movement in all directions can be prevented, the support rib positions 61 on the side surfaces eliminate the gaps on the left and right sides of the original movement body 1, and the movement body 1 is prevented from shaking left and right when being impacted. 3. Be connected the support that realizes core 1 through support 6 and measurement shell 2, core 1 is metal material, is connected original checkpost 3 and core 1 of plastics material and is improved to be connected with the measurement shell 2 of metal material, and joint strength is higher, and consequently the bearing structure after optimizing is stronger than original to core 1's support effect. 4. The thickness of the sealed face 100 of the movement body of checkpost 3 on original movement body 1 and the sealed face 100 of the movement body junction of movement body 1 is thicker than the sealed face 100 thickness of the movement body of other positions department, there is certain shrink circumstances after the sealed face 100 shaping of the movement body that can lead to here, the sealed face 100 of the movement body of the machine body that 1 checkpost after the optimization cancels the checkpost structure on the original movement body 1 and also has avoided shrinking on the sealed face 100 of the movement body that original checkpost 3 arouses from the technology, the manufacturability of part manufacturing is better, the risk of movement group gas leakage has also been avoided simultaneously.

The improvement point two: improvements in bottom bracket 4 and bottom bracket support post 40

Fig. 3-5 show the structure of the original center shaft 4 and the center shaft support pillar 40, the center shaft support pillar 40 is integrally formed with the movement body 1, the center shaft support pillar 40 is sleeved outside the center shaft 4, and it can be seen that, before the improvement, the bottom of the center shaft support pillar 40 extends into the air outlet flow passage 5.

Fig. 13-15 show the modified rear center shaft 4 and the center shaft support pillar 40, and it can be seen that, after modification, the bottom of the center shaft support pillar 40 is located above the air outlet flow passage 5, and the bottom of the center shaft 4 is located above the bottom of the center shaft support pillar 40.

The installation position of the middle shaft 4 on the machine core is raised, the part of the middle shaft support column 40 in the original flow channel is eliminated, the position of the air outlet flow channel 5 of the machine core is vacated, no flow-blocking barrier exists in the air outlet flow channel 5 of the machine core, and the air pressure loss can be reduced. Because the original part of the middle shaft 4 in the air outlet flow passage 5 is cancelled, the length of the middle shaft 4 is correspondingly shortened relative to the length of the original middle shaft 4, the deformation bending moment of the middle shaft 4 is reduced under the condition that the stress of the middle shaft 4 is unchanged in the transmission process, the deformation of the middle shaft 4 is reduced, and the transmission stability and reliability are improved.

In addition, the reinforcing rib 400 is additionally arranged on the periphery of the center shaft supporting column 40, and the deformation of the center shaft supporting column 40 can be reduced by reinforcing the center shaft supporting column 40, so that the deformation of the center shaft 4 installed in the center shaft supporting column 40 can be further reduced.

The improvement point is three: improvement of support group 9

Fig. 16-22 show the structure of the improved front support group 9, the support group 9 comprises an output wheel 92 and a bearing assembly 91, the bearing assembly 91 is a monolithic cylindrical structure, the inner wall of the bearing assembly 91 forms a complete bearing surface and is sleeved on the shaft of the output wheel 92, so that the shaft of the output wheel 92 can rotate in the bearing surface, the output wheel 92 is a split structure formed by combining two parts, as shown in fig. 21 and 22, the output wheel 92 comprises a first split part 921 and a second split part 922, so that the output wheel 92 can be installed in the cylindrical bearing assembly 91. The mounting of the seat group 9 on the valve gate 7 is as follows: be equipped with two bearing frame 8 on the valve bars 7, bearing assembly 91 bottom is provided with supporting shoe 911, and supporting shoe 911 top is equipped with an arcwall face in order to support bearing assembly 91, during the installation, installs two parts of output wheel 92 to the bearing assembly 91 earlier in, and the supporting shoe 911 of rethread bearing assembly 91 bottom is installed on the bearing frame 8 on the valve bars 7 to the realization is organized the support and is installed to the valve bars 7.

Fig. 23-32 show the structure of the improved support set 9, the support set 9 includes an output wheel 92 and a bearing assembly 91, two bearing seats 8 for supporting the output wheel 92 are integrally injection-molded on the valve gate 7, and the two bearing seats 8 are symmetrically arranged about the central axis 4, the support set 9 is arranged on one of the bearing seats 8, the structure of the support set 9 is different from that of the original support set 9: the output wheel 92 is of a one-piece construction and the bearing assembly 91 is semi-cylindrical. The inner wall of the bearing assembly 91 forms an upper semicircular bearing surface, the bearing seat 8 is provided with a lower semicircular bearing surface 80, and the upper semicircular bearing surface and the lower semicircular bearing surface 80 form a complete bearing surface which is sleeved on the shaft of the output wheel 92. The detachable connection between the bearing assembly 91 and the bearing housing 8 is as follows: the bearing assembly 91 is provided with a connecting part 914, the connecting part 914 is internally provided with a mounting buckle 913, and the bearing assembly 91 is fixedly connected with the bearing seat 8 through the buckling between the mounting buckle 913 and the bottom of the bearing seat 8. The side of bearing frame 8 is equipped with bulge 81, and the connecting portion 914 side of bearing assembly 91 is equipped with the anticreep protrudingly 915, and the protruding side of the protruding portion of 915 and bearing frame 8 of anticreep supports tightly, the protruding effect of 915 of anticreep: play the effect of horizontal location on the one hand for thereby go up semi-circular bearing surface and semi-circular bearing surface 80 can aim at down and constitute a complete bearing surface, on the other hand also can strengthen the connection fixed action to bearing assembly 91, prevents that output wheel 92 from droing in the transportation.

Still the cooperation is provided with between bearing assembly 91 and the output wheel 92 and is used for preventing the anti-reversion device that output wheel 92 reverses, the anti-reversion device is including preventing contrary piece 93, prevent contrary piece 93 one end swing joint on bearing assembly 91, prevent against contrary piece 93 bottom and be equipped with left-hand thread 933, open at bearing assembly 91 top has prevents contrary through-hole 916, the left-hand thread 933 of preventing contrary piece 93 passes behind the left-hand thread through-hole 916 butt in the surface of output wheel 92, and the surface of output wheel 92 still be equipped with can with prevent the anti-reversion screens 923 of the one-way block of left-hand thread 933 of contrary piece 93. Two limiting baffles 917 for enabling the anti-reverse block 93 to move only along a plane perpendicular to the axial direction of the output wheel 92 are arranged on the top of the bearing assembly 91 outside the anti-reverse through hole 916, and the two limiting baffles 917 are respectively located on two sides of the anti-reverse block 93.

The movable connection between the check block 93 and the bearing assembly 91 is as follows: prevent contrary 93 one end and be counter weight end 931, the other end is installation end 932, be equipped with door type frame 912 in the bearing outside on bearing assembly 91, door type frame 912 top is equipped with prevents contrary piece installation position 9121, prevent offering on contrary 93's the installation end 932 and supply to prevent contrary piece installation position 9121 male mounting groove 9321, and prevent contrary piece installation position 9121 top and be equipped with and be used for preventing the anticreep end that prevents contrary piece installation position 9121 from deviating from in mounting groove 9321, prevent having the upset clearance between contrary piece installation position 9121's outer wall and mounting groove 9321's the inner wall, because the mounting groove 9321 of preventing contrary piece 93 is slightly wider in the installation position on preventing contrary piece 93, prevent contrary piece 93 and can do the upset of certain angle on bearing assembly 91.

In order to enhance the anti-reverse effect between the anti-reverse block 93 and the anti-reverse blocking portion 923, a self-locking inclined surface is cooperatively arranged between the reverse buckle 933 of the anti-reverse block 93 and the anti-reverse blocking portion 923 of the output wheel 92.

When the output wheel 92 rotates in the forward direction (clockwise rotation in fig. 31), the anti-reverse block 93 depends on the self gravity, the reverse buckle 933 at the front end of the anti-reverse block is always attached to the shaft of the output wheel 92, and the output wheel 92 can rotate smoothly; when the output wheel 92 rotates reversely (rotates counterclockwise in fig. 32), the anti-reverse position-locking portion 923 on the output wheel 92 is engaged with the reverse button 933 on the anti-reverse block 93, and the two parts are fastened more and more tightly due to the self-locking inclined plane formed between the two parts, so that the anti-reverse function is achieved.

The invention improves the integral support structure in the original support group 9 into a split support structure, a bearing for supporting the output wheel 92 consists of a bearing assembly 91 and two bearing surfaces of a bearing seat 8, the output wheel 92 is improved into the integral structure from the original split structure, and the invention has the advantages that: 1. the bearing seat 8 on the original valve gate 7 is improved to be a part of the structure of the bearing, the supporting block 911 for supporting the bearing is omitted, the whole bearing assembly 91 is simpler in structure, and the material cost is reduced. 2. Because the bearing is improved to be a split structure, the output wheel 92 can be arranged to be an integral structure, compared with the original split structure, the structure is simpler, and the production and assembly processes are simplified.

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