CN109738037B - Method for solving temperature compensation of membrane type gas meter by using tensile stress - Google Patents
Method for solving temperature compensation of membrane type gas meter by using tensile stress Download PDFInfo
- Publication number
- CN109738037B CN109738037B CN201910142368.4A CN201910142368A CN109738037B CN 109738037 B CN109738037 B CN 109738037B CN 201910142368 A CN201910142368 A CN 201910142368A CN 109738037 B CN109738037 B CN 109738037B
- Authority
- CN
- China
- Prior art keywords
- temperature compensation
- amplitude
- limiting
- gas meter
- column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a method for solving temperature compensation of a membrane type gas meter by using tensile stress, which relates to the technical field of membrane type gas meters, in particular to a machine core, wherein rocker arms are arranged on the front side and the rear side of the machine core, membrane clamping plates, membranes, parallel plates and side covers are arranged on the outer sides of the rocker arms, membrane pressing strips are arranged around the membranes, vertical shafts are vertically arranged on the side walls of the machine core, the top ends of the vertical shafts are matched with toggle joints and connecting rods and are connected in a penetrating manner through deflection shafts, gear plates are arranged below the deflection shafts, track grooves are formed in arc-shaped penetrating manner on the lower positions of one sides of the surfaces of the gear plates, and the deflection shafts are matched in the track grooves. The method for solving the temperature compensation of the membrane type gas meter by using the tensile stress adopts a material (taking polytetrafluoroethylene as an example) with small heat capacity and quick response as a temperature compensation line, the response time of the material is more than 30 times shorter than that of a bimetallic strip, and in addition, the compensation error caused by free deformation of a membrane is fitted, so that the metering precision can be greatly improved.
Description
Technical Field
The invention relates to the technical field of membrane gas meters, in particular to a method for solving temperature compensation of a membrane gas meter by using tensile stress.
Background
The diaphragm gas meter is still the most widely applied gas metering device because of good stability and low price, however, the diaphragm gas meter has the defects that the diaphragm gas meter only meters volume and has no compensation function for temperature, and the diaphragm gas meter is known according to a gas equation, and when the ambient temperature is different by 3 ℃, the metering error is different by 1%, the variation in one day is often tens to twenty-several degrees, and the variation in different seasons is more than four fifty degrees; the volume is reduced by 13.6% to-20 degrees based on 20 degrees, so it can be said that no temperature compensation is a major cause of the gas supply and distribution balance.
At present, the temperature compensation scheme of the diaphragm gas meter is basically implemented by utilizing the temperature strain of the bimetallic strip to act on the transmission mechanism to change the valve stroke so as to realize temperature compensation.
The main problems of the compensation scheme are that the bimetallic strip has large mass, large heat capacity and poor responsiveness, for example, the heat capacity of 50 grams of bimetallic strip per degree is about 23 joules, the heat capacity of 1 degree of one liter of fuel gas under standard pressure is 1.57 joules, and the heat conductivity coefficient of the gas is small, the thermal inertia is large, the response time is overlong and the measurement error is overlarge; in addition, because the bimetal has large mass, long-term eccentric operation can be caused on the moving component, eccentric abrasion of the engine component is easily caused, the service life of the gas meter is shortened, in addition, when the swinging amplitude of the coating is reduced, the free part of the coating can form a circular arc-shaped bulge under the action of air pressure, the original mechanical temperature compensation mechanism does not consider compensation errors caused by deformation of the free part of the coating, and the error is also caused to be larger because of poor linearity of volume change.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for solving the temperature compensation of a membrane type gas meter by utilizing tensile stress, and solves the problems in the prior art.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the method for solving the temperature compensation of the membrane type gas meter by utilizing tensile stress comprises a machine core, rocker arms are arranged on the front side and the rear side of the machine core, membrane clamping plates are arranged on the outer sides of the rocker arms, membranes are arranged on the outer sides of the membrane clamping plates, membrane pressing strips are arranged on the periphery of the membranes, parallel plates are arranged on the other sides of the membranes, side covers are assembled on the outer sides of the parallel plates, vertical shafts are vertically arranged on the side walls of the machine core, toggle joints are assembled on the top ends of the vertical shafts, connecting ends of the toggle joints are cooperatively connected with connecting rods, the connecting rods are totally provided with two connecting rods and are connected with one another through a deflection shaft, a gear disc is arranged below the deflection shaft, a track groove is formed in an arc-shaped penetration manner on one side of the surface of the gear disc, the deflection shaft is assembled in the track groove, circle center columns, first winding columns and second winding columns are distributed on the other side of the surface of the gear disc in a triangular shape, a first spring is arranged between the circle center column and the deflection shaft, temperature compensation wires are arranged around the peripheries of the circle center column, the first winding column and the second winding column, a first positioning column is arranged in the middle of parallel lines between the vertical shafts, one end of the second spring is fixed at the end part of the first positioning column, the other end of the second spring is fixed on the connecting shaft, the temperature compensation wires are arranged around the outer side of the connecting shaft, the upper part of the toggle joint is provided with limiting sliding blocks, the upper parts of the limiting sliding blocks are provided with transmission rods, the transmission rods are provided with two transmission rods, the transmission rods are connected through the connecting shaft, the first limiting columns are arranged in the limiting sliding blocks and protrude from the toggle joint part, a second limiting column is arranged on the upper side of the vertical shaft, a third positioning column is arranged under the second limiting column, the parallel plate is symmetrically provided with a first limiting hole and a second limiting hole, one side of the side cover is symmetrically provided with a first threading hole and a second threading hole, a ring line is arranged at the center line position of the free end of the leather membrane, a traction fixed point is arranged at 1/4 position of the long side symmetry position of the ring line, a positioning hole is arranged at the position of the parallel plate corresponding to the traction fixed point, one side of the positioning hole is circumferentially provided with a fourth positioning column, and a cam is added at the far end of the temperature compensation line to realize compensation fitting.
Optionally, the rocker arm controls the film to reciprocate through the film clamping plate to form an air cavity, the rocker arm is connected to an external toggle joint through a vertical shaft on the side wall of the movement, the toggle joint is connected with the connecting rods, the connecting rods on two sides are fixed through a displacement shaft, and the lower end of the displacement shaft is inserted into a track groove on the gear plate and can slide in the track groove.
Optionally, in the case of the temperature compensation diaphragm gas meter, a first spring is disposed between the displacement shaft and the center post, so as to keep the maximum radius rotation during the operation of the mechanism when keeping the temperature constant, the temperature compensation wire passes through the first spring, one end of the temperature compensation wire is fixed on the displacement shaft, is pulled to the first winding post after passing through the center post, then is wound back to the center post after passing through the second winding post, one end of the temperature compensation wire is fixed according to specific length, the upper end of the displacement shaft is connected with the connecting rod, two ends of the connecting rod are respectively connected with a toggle joint, the other end of the toggle joint is connected with a vertical shaft, and the vertical shaft is matched with the rocker arm, so that the reciprocating motion of the diaphragm is realized.
Optionally, in the temperature compensation method, regarding the temperature compensation diaphragm gas meter, one way is to add a limiting device on the side wall of the gas chamber, a second positioning column is arranged in the middle of parallel lines of two side vertical shafts, one end of a second spring is fixed, the other end of the second spring is connected with a connecting shaft, the temperature compensation line bypasses the connecting shaft and then passes through the upper part and then is fixed around the bottom according to a specific length, the connecting shaft is connected with two side transmission rods, the lower part of the transmission rod is connected with a limiting sliding block, the limiting sliding block slides in a sliding block track, the limiting sliding block is a groove with a narrow upper part and a wide lower part, a first limiting column protruding from a toggle part is arranged in the limiting sliding block, and the first limiting column can finally limit the swing amplitude of a rocker arm through the movement in the limiting sliding block;
in the temperature compensation method, the other mode adopts a mode of double temperature compensation wires, namely a second amplitude limiting column is arranged on one side of a vertical shaft of the side wall of the air chamber, a third positioning column is arranged vertically below the second amplitude limiting column, and the temperature compensation wires are wound to the third positioning column after passing through the second amplitude limiting column and then are fixed at the bottom;
the two modes are symmetrical structures, the temperature compensation line stretches or grows along with the change of temperature, and the swing range of the toggle is limited, so that the swing amplitude of the rocker arm is enlarged or reduced, and the purpose of temperature compensation is achieved.
Optionally, in the temperature compensation method, for the temperature compensation diaphragm gas meter, one way is to symmetrically form a first threading hole and a second threading hole on one side of a side cover, symmetrically form a first limiting hole and a second limiting hole on a parallel plate, fix one end of one temperature compensation line on the first threading hole of the side cover, then pass through the first limiting hole and the second limiting hole on the upper and lower sides of the parallel plate, and finally pass through the second threading hole and then select a fixed point according to the length;
in the temperature compensation method, a ring line is arranged at the center line position of the free end of the leather film, the ring line is a metal thin line with larger elastic modulus and smaller temperature linear expansion coefficient, traction fixing points of the temperature compensation line are arranged at 1/4 positions of the long side symmetry positions, positioning holes are correspondingly formed in parallel plates, one temperature compensation line is wound on a fourth positioning column from the traction fixing points of the ring line through the positioning holes of the parallel plates, and the fixing points are selected according to specific lengths, so that the structures are symmetrically distributed.
Optionally, in the mechanical temperature compensation diaphragm gas meter, when the swing amplitude of the diaphragm is reduced, the free portion of the diaphragm is formed into a circular arc-shaped protrusion under the action of air pressure, and the free portion of the diaphragm can be divided into two sections, namely L1 and L2, wherein L2 is equal to the supporting surface of the side wall, L1 is a free expansion portion, and the arc length of the expansion portion is also equal to the arc length of the expansion portion; s1, compensating the reduction amplitude of the rocker arm, generating arc-shaped bulges as a whole, wherein the nonlinear volume change quantity is the area formed by an arc and a chord thereof;
according to the formula:
from this, the chord lower area is
Wherein the length of the free part is the arc length L in the moving process of the involucra, the chord length can be determined by the displacement and the fixed point, a is the arc central angle, and R is the radius;
the compensated deviation presents a nonlinear result;
when 20 degrees and-5 degrees are selected as the amplitude adjustment standard value (3 mm), the deviation of the amplitude adjustment value and the volume change after compensation is smaller than 1% within the range of-25 to 20, the amplitude adjustment value and the volume change are approximately considered to be in a linear relation, polytetrafluoroethylene (linear expansion coefficient is 1.1-2.56X10-4/DEGC) is taken as an example, the amplitude is reduced by 3mm, and the requirement can be met by 1.2 m of linear length.
Optionally, the response time of the temperature compensation line (taking polytetrafluoroethylene as an example) is shorter than that of the bimetallic strip by more than 30 times, so that the metering precision is greatly improved;
the range of swing is changed by utilizing the tensile stress generated by temperature change, so that the volume and heat capacity of a temperature stress body can be effectively reduced, the response time is greatly shortened, and the metering precision is improved;
when the amplitude of the rocker arm in the air cavity is linearly reduced or increased, the problem of non-linearity of volume reduction or increase can occur, and the non-linearity error is corrected by fitting in a way that the rotation radius of the deflection shaft on the gear disc is changed into a corresponding curve.
Optionally, when the amplitude of the rocker arm in the air cavity is linearly reduced or increased, the problem of non-linearity of volume reduction or increase may occur, and a manner of changing the inclined edge of the amplitude limiting sliding block into a corresponding curve is adopted, or the end part of the second amplitude limiting column is designed to be in a cam shape to be matched with a linear amplitude limiting wall, so that fitting is performed to correct the non-linearity error.
Optionally, the swing amplitude of the film-clamping plate and the expansion and contraction amount of the temperature compensation line are not in a linear relationship, but approximate to a linear relationship when the swing amplitude compensation amount is not too large.
Optionally, in the temperature compensation method, a cam can be added at the far end of the temperature compensation line and is fixed with the cam at a single point, and nonlinear conversion output of linear change of the compensation line is realized in the temperature compensation process, so that the problem that the swing amplitude of the (quasi-compensation) revolution volume temperature compensation swing arm is linear change and the volume change is nonlinear is solved.
The invention provides a method for solving temperature compensation of a membrane type gas meter by using tensile stress, which has the following beneficial effects: according to the method for solving the temperature compensation of the membrane type gas meter by using the tensile stress, a material (polytetrafluoroethylene is taken as an example) with small heat capacity and quick response is adopted as a temperature compensation line, the response time is shortened by more than 30 times compared with that of a bimetallic strip, and the metering precision is greatly improved; in addition, the compensation error and fitting calculation caused by deformation of the free part of the leather membrane are considered, so that the measurement precision can be more accurate; the concrete implementation mode has reasonable structural design, simple installation, convenient use, flexible structural movement and accurate positioning.
Drawings
FIG. 1 is a schematic diagram of a membrane gas meter according to the present invention;
FIG. 2 is a schematic diagram of temperature compensated nonlinear bias calculation according to the present invention;
FIG. 3 is a schematic diagram of a gear plate pull line compensation structure according to the present invention;
FIG. 4 is a schematic diagram of a portion of the present invention employing swing arm swing amplitude limiting compensation;
FIG. 5 is a schematic diagram of another part of the structure of the present invention employing swing arm swing amplitude limiting compensation;
FIG. 6 is a schematic diagram of a portion of the structure of the present invention employing involucra clipping compensation;
FIG. 7 is a schematic diagram of another part of the structure of the present invention employing involucra clipping compensation;
fig. 8 is a schematic view of the fitting achieved by mounting cams in accordance with the present invention.
In the figure: 1. a movement; 2. a rocker arm; 3. a film-clamping plate; 4. a coating film; 5. a diaphragm pressing strip; 6. a parallel plate; 7. a side cover; 8. a connecting rod; 9. toggle joint; 10. a vertical shaft; 11. a gear plate; 12. a displacement shaft; 13. a track groove; 14. a first spring; 15. a temperature compensation line; 16. a center column; 17. a first winding post; 18. a second winding post; 19. a first positioning column; 20. a second spring; 21. a slider rail; 22. a first clipping column; 23. a connecting shaft; 24. a clipping slider; 25. a transmission rod; 26. a second positioning column; 27. a second clipping column; 28. a third positioning column; 29. a first threading hole; 30. a first limiting hole; 31. a second limiting hole; 32. a second threading hole; 33. a loop line; 34. traction fixation point; 35. positioning holes; 36. a fourth positioning column; 37. a cam.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Example 1:
as shown in figure 1, a film type gas meter temperature compensation device mainly comprises a metering device, wherein the metering device comprises a machine core 1, a metering chamber and a transmission device at the upper part, the metering chamber comprises a rocker arm 2, a film clamping plate 3, a film 4, a film pressing strip 5, parallel plates 6 and a side cover 7, the rocker arm 2 controls the film 4 to reciprocate through the film clamping plate 3 to form an air cavity, the film type gas meter temperature compensation device is characterized in that the rocker arm 2 is connected to an external toggle 9 through a vertical shaft 10 on the side wall of an air chamber, the toggle 9 is connected with a connecting rod 8, the connecting rods 8 at two sides are fixed through a deflection shaft 12, and the lower end of the deflection shaft 12 is inserted into a track groove 13 on a gear disc 11 and can slide in the track groove 13. When gas is introduced, the rotation of the gear disc 11 drives the connecting rod 8 and the toggle 9 to move through the deflection shaft 12, and the rocker arm 2 connected with the vertical shaft 10 drives the leather film 4 to reciprocate to realize metering.
As shown in fig. 2, when the swing amplitude of the film 4 is reduced, the free portion of the film 4 will form a circular arc-shaped bulge under the action of air pressure, so that the free portion of the film 4 can be divided into 2 sections, namely L1 and L2, wherein L2 is equal to the side wall supporting surface, L1 is a free expansion portion, and the arc length of the expansion portion is also equal to the arc length of the expansion portion; s1 is the reduction amplitude of the rocker arm 2 after compensation, the whole generates arc-shaped bulges, and the nonlinear volume change quantity is the area formed by the arc and the chord thereof.
According to the formula:
from this, the chord lower area is
Wherein, the length of the free part in the moving process of the coating film 4 is the arc length L, the chord length can be determined by the displacement and the fixed point, a is the arc central angle, and R is the radius.
From the above formula, the compensation error caused by the deformation of the free expansion portion of the coating film 4 is calculated as follows:
| temperature (temperature) | Volume deviation 1 | Amplitude adjustment amount | Volume deviation 2 | Deviation after compensation |
| 20 | 0.00％ | 0 | 0.00％ | 0.00％ |
| 15 | -1.74％ | 0.6 | -1.17％ | -0.57％ |
| 10 | -3.53％ | 1.2 | -3.07％ | -0.46％ |
| 5 | -5.39％ | 1.8 | -5.09％ | -0.31％ |
| 0 | -7.32％ | 2.4 | -7.18％ | -0.15％ |
| -5 | -9.32％ | 3 | -9.32％ | 0.00％ |
| -10 | -11.40％ | 3.6 | -11.54％ | 0.14％ |
| -15 | -13.56％ | 4.2 | -13.84％ | 0.28％ |
| -20 | -15.80％ | 4.8 | -16.23％ | 0.43％ |
| -25 | -18.13％ | 5.4 | -18.71％ | 0.58％ |
The volume deviation 1 is a theoretical compensation value calculated according to the temperature change; the volume deviation 2 is an actual compensation value calculated according to the amplitude adjustment amount;
as can be seen from the above table, the compensated deviation presents a nonlinear result; when 20 degrees and-5 degrees are selected as the amplitude adjustment standard values (3 mm), the deviation of the amplitude adjustment values and the volume change after the compensation is smaller than 1% within the range of-25 to 20, and the amplitude adjustment values and the volume change are approximately considered to be in a linear relation. Taking polytetrafluoroethylene (linear expansion coefficient of 1.1-2.56X10-4/. Degree.C) as an example, the amplitude is reduced by 3mm, and the linear length of 0.5-1.2 m is needed to meet the requirement.
Polytetrafluoroethylene is used as a temperature compensation line 15, mainly according to the measurement of the linear expansion coefficient; taking a diaphragm gas meter with a revolution volume of 1.2 liters as an example, the stroke of a valve is reduced by 3mm, the volume adjustment can reach 18%, the compensation amount equivalent to 45-degree temperature difference is reduced by 3mm according to 40 degrees, and the length is 60-80 cm, so that the requirement can be met; taking polytetrafluoroethylene (specific heat capacity 1.05J/g) as an example, 1mm diameter, 1 meter less than 1 g, heat capacity less than 1J, heat capacity reduced by 23 times compared to a bimetallic strip, and response time reduced if the surface area is increased appropriately. Experiments show that the response time of the polytetrafluoroethylene belt is shortened by more than 30 times compared with that of the bimetallic strip, and the metering precision is greatly improved.
Example 2:
fig. 3 is a schematic diagram of a structure in which temperature compensation is achieved by pulling wires on the gear wheel 11. As shown in fig. 3, one of the structures is that the lower end of the shift shaft 12 is inserted into a track groove 13 on the gear disc 11 and can slide in the track groove 13, a first spring 14 is arranged between the shift shaft 12 and a center post 16 to keep the maximum radius rotation during the operation of the mechanism when keeping the constant temperature, a temperature compensation wire 15 passes through the first spring 14, one end of the temperature compensation wire is fixed on the shift shaft 12, is pulled to a first winding post 17 after passing through the center post 16, and is fixed according to the fixed length after being wound back to the center post 16 again after passing through a second winding post 18; the upper end of the deflection shaft 12 is connected with the connecting rod 8, two ends of the connecting rod 8 are respectively connected with a toggle 9, the other end of the toggle 9 is connected with a vertical shaft 10, and the vertical shaft 10 is matched with the rocker arm 2 to realize the reciprocating motion of the leather membrane 4.
When the gas meter is at low temperature, the temperature compensation line 15 can shrink and deform, the displacement shaft 12 is driven to move towards the direction of the center column 16 by tensile stress, and then the stroke is shortened by the geometric dimension constraint relation of the connecting rod 8, the toggle 9, the vertical shaft 10, the rocker arm 2 and the leather membrane 4, so that the purpose of temperature compensation is achieved. When the gas meter is at high temperature, the temperature compensation line 15 expands and deforms, and drives the deflection shaft 12 to be far away from the direction of the center column 16, and then the stroke of the rocker arm 2 is prolonged by the geometric dimension constraint relation of the connecting rod 8, the toggle 9, the vertical shaft 10, the rocker arm 2 and the leather membrane 4, so that the purpose of temperature compensation is achieved.
When the amplitude of the rocker arm 2 in the air cavity is linearly reduced or increased, the problem of non-linearity of volume reduction or increase may occur, and the non-linearity error is corrected by fitting in such a way that the rotation radius of the deflection shaft 11 on the gear disc 12 becomes a corresponding curve.
Example 3:
referring to fig. 4 and 5, in order to adopt the swing amplitude limiting compensation scheme of the rocker arm 2, as shown in fig. 4, one structure is that an amplitude limiting device is added on the side wall of the air chamber, a first positioning column 19 is arranged in the middle of parallel lines of two side vertical shafts 10, one end of a second spring 20 is fixed, the other end of the second spring 20 is connected with a connecting shaft 23, a temperature compensation wire 15 bypasses the connecting shaft 23 and then passes through a second positioning column 26 at the upper part to be wound to the bottom and fixed according to a specific length, the connecting shaft 23 is connected with two side transmission rods 25, an amplitude limiting sliding block 24 is connected at the lower part of the transmission rods 25, the amplitude limiting sliding block 24 is a groove with a narrow upper part and a wide lower part, a first amplitude limiting column 22 protruding from a part of a toggle 9 is arranged in the amplitude limiting sliding block 24, and the first amplitude limiting column 22 can finally limit the swing amplitude of the rocker arm 2 through the movement in the amplitude limiting sliding block 24.
When the temperature compensation line 15 is shortened due to the reduction of the temperature, the transmission rod 25 drives the amplitude limiting slide block 24 to move downwards on the slide block track 21, so that the left-right swing amplitude of the first amplitude limiting column 22 is reduced, the swing amplitude of the rocker arm 2 is also reduced, and the rotation volume is also reduced; conversely, when the temperature rises, the transmission rod 25 drives the amplitude limiting sliding block 24 to move upwards, the swing amplitude of the first amplitude limiting column 22 is increased, the swing amplitude of the rocker arm 2 is also increased, and the volume of the revolution is increased simultaneously; by adopting a symmetrical design, one temperature compensation line 15 can simultaneously play a limiting role on the rocker arms 2 at both sides.
According to previous analysis of the air cavity, when the amplitude of the rocker arm 2 in the air cavity is linearly reduced or increased, a problem of non-linearity may occur in that the volume is reduced or increased, and the non-linearity error is corrected by fitting the inclined side of the limiter slider 24 into a corresponding curve (or by designing the end of the limiter post to have a cam shape matching with a linear limiter wall).
As shown in fig. 5, another structure is that a double temperature compensation line mode is adopted, a second limiting column 27 is arranged on one side of the vertical shaft 10 of the side wall of the air chamber, a third positioning column 28 is arranged vertically below the second limiting column 27, and the temperature compensation line 15 passes through the second limiting column 27, is wound to the third positioning column 28, is wound to the bottom and is fixed according to a specific length. Both the two modes are symmetrical structures. The temperature compensation line 15 stretches or grows along with the change of temperature, and the swing amplitude of the rocker arm 2 is increased or decreased by limiting the swing range of the toggle 9, so that the purpose of temperature compensation is achieved. The temperature compensation line 15 stretches or grows along with the change of temperature, and the swing amplitude of the rocker arm 2 is increased or decreased by limiting the swing range of the toggle 9, so that the purpose of temperature compensation is achieved.
Example 4:
as shown in fig. 6 and 7, the temperature compensation method using the coating film 4 clipping scheme is adopted. As shown in fig. 6, one of them is to adopt the involucra 4 clipping method. One of the structures is that a first threading hole 29 and a second threading hole 32 are symmetrically formed on one side of the side wall of the air cavity, a first limiting hole 30 and a second limiting hole 31 are symmetrically formed on the parallel plate 6, one end of one temperature compensation wire 15 is fixed on the first threading hole 29 of the side wall of the air cavity, then the temperature compensation wire passes through the first limiting hole 30 and the second limiting hole 31 which are arranged on the upper side and the lower side of the parallel plate 6, and finally the temperature compensation wire passes through the second threading hole 32 and is fixed according to a specific length. As shown in fig. 7, another structure is that a ring line 33 is arranged at the center line position of the free end of the coating film 4, the ring line 33 needs to adopt a metal thin line with larger elastic modulus and smaller temperature linear expansion coefficient, and a traction fixed point 34 is arranged at the 1/4 position of the long side symmetry, and a positioning hole 35 is correspondingly arranged on the parallel plate 6, wherein one temperature compensation line 15 is wound on a fourth positioning column 36 from the traction fixed point 34 of the ring line 33 through the positioning hole 35 on the parallel plate 6, and the fixed points are selected according to specific lengths, and the above structures are symmetrically distributed.
When the temperature is reduced, after the temperature compensation line 15 is contracted, the swing amplitude of the film-clamping plate 3 is limited in two directions, so that the compensation purpose is achieved. It should be noted that the oscillation amplitude of the diaphragm plate 3 is not linearly related to the expansion and contraction amount of the temperature compensation line 15, but is approximately linearly related when the oscillation amplitude compensation amount is not too large.
Example 5:
fig. 8 is a schematic view of the fitting achieved by mounting cam 37. Taking the cam 37 mounted on the gear disc 11 as an example, the length change of the temperature compensation line 15 and the temperature are in linear relation, the swing amplitude of the diaphragm is also in linear relation with the expansion and contraction of the line length under the drive of the mechanism, but the rotation volume compensation change of the corresponding air cavity is not in linear relation with the swing amplitude of the diaphragm; the cam 37 is added at the far end of the temperature compensation line 15 and is fixed with the cam 37 at a single point, so that nonlinear conversion output of linear change of the compensation line can be realized in the temperature compensation process, and the problem that the swing amplitude of the (quasi-compensation) rotary volume temperature compensation rocker arm 2 is linearly changed and the volume change is nonlinear is solved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress comprises a movement (1), and is characterized in that: the utility model provides a winding device for a motor core, including core (1), rocker arm (2) are all installed to both sides around core (1), and the outside of rocker arm (2) all is provided with clamp lamina membranacea (3), involucra (4) are installed in the outside of clamp lamina membranacea (3), the outside of involucra (4) is provided with diaphragm layering (5), and parallel plate (6) are installed to the lateral surface card of diaphragm layering (5), side cap (7) are installed to the outside of parallel plate (6), gear disc (11) are settled to the top of core (1), and the both sides of gear disc (11) are all vertically provided with vertical scroll (10), toggle (9) are settled in the top cooperation of vertical scroll (10), and the link cooperation of toggle (9) is connected with connecting rod (8), connecting rod (8) are provided with two altogether, and link (8) pass through between through the connection of shifting axle (12), the surface one side of gear disc (11) is the decurrent position and is arcuately link up and has track groove (13), and shifting axle (12) cooperate in the inside of track groove (13), the surface of gear disc (11) is the surface of opposite side (16) is triangle-shaped, and first spool (16) and second spool (16), and second spool (16) are provided with between the first spool (16) and the spool (16), and the center of a circle (16) is provided with, and the center (16) The periphery of the first winding column (17) and the second winding column (18) is surrounded by a temperature compensation line (15), a first positioning column (19) is arranged at the middle position of parallel lines between the vertical shafts (10), one end of a second spring (20) is fixed at the end part of the first positioning column (19), the other end of the second spring (20) is connected with a connecting shaft (23), the temperature compensation line (15) is surrounded on the outer side of the connecting shaft (23), a limiting sliding block (24) is arranged at the upper part of the toggle (9), a transmission rod (25) is arranged at the upper part of the limiting sliding block (24), two transmission rods (25) are arranged in common, the transmission rods (25) are connected through the connecting shaft (23), a first limiting column (22) is arranged inside the limiting sliding block (24), the first limiting column (22) is partially protruded from the toggle (9), a second limiting column (27) is arranged at the upper side of the vertical shaft (10), a third positioning column (28) is arranged below the second limiting column (27), a parallel plate (6) is symmetrically provided with a center line hole (32), a limit hole (32) is formed at the upper side of the first limiting sliding block (24), a limit hole (32) is symmetrically arranged at the second limiting sliding block (30), and the ring line (33) is provided with a traction fixed point (34) at the 1/4 position of the long-side symmetry position, a positioning hole (35) is arranged at the position of the parallel plate (6) corresponding to the traction fixed point (34), a fourth positioning column (36) is circumferentially arranged at one side of the positioning hole (35), and a cam (37) is arranged on the gear disc (11).
2. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress according to claim 1, wherein the method comprises the following steps of: the rocker arm (2) controls the leather film (4) to reciprocate through the film clamping plate (3) to form an air cavity, the rocker arm (2) is connected to an external toggle joint (9) through a vertical shaft (10) on the side wall of the air chamber, the toggle joint (9) is connected with the connecting rods (8), the connecting rods (8) on two sides are fixed through a deflection shaft (12), and the lower end of the deflection shaft (12) is inserted into a track groove (13) on the gear disc (11) and slides in the track groove (13).
3. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress according to claim 1, wherein the method comprises the following steps of: for the temperature compensation diaphragm gas meter, a first spring (14) is arranged between a deflection shaft (12) and a circle center column (16) so as to keep the maximum radius rotation during the operation of a mechanism when the temperature is kept constant, a temperature compensation line (15) passes through the first spring (14), one end of the temperature compensation line is fixed on the deflection shaft (12), is pulled to a first winding column (17) after passing through the circle center column (16), is then wound to the circle center column (16) again after passing through a second winding column (18), one end is selected according to specific length, the upper end of the deflection shaft (12) is connected with a connecting rod (8), two ends of the connecting rod (8) are respectively connected with a toggle joint (9), the other end of the toggle joint (9) is connected with a vertical shaft (10), and the vertical shaft (10) is matched with a rocker arm (2) so as to realize the reciprocating motion of a diaphragm (4).
4. A method for addressing membrane gas meter temperature compensation using tensile stress as defined in claim 3 wherein: in the temperature compensation method, for the temperature compensation diaphragm type gas meter, a limiting device is added on the side wall of a gas chamber, a second positioning column (26) is arranged in the middle of parallel lines of vertical shafts (10) on two sides, one end of a second spring (20) is fixed, the other end of the second spring (20) is connected with a connecting shaft (23), after the temperature compensation line (15) bypasses the connecting shaft (23) and passes through the upper part (26), the connecting shaft (23) is fixed to the bottom according to a specific length, the connecting shaft (23) is connected with two side transmission rods (25), a limiting sliding block (24) is connected to the lower part of the transmission rod (25), the limiting sliding block (24) slides in a sliding block track (21), the limiting sliding block (24) is a groove with a narrow upper part and a wide lower part, a first limiting column (22) protruding from a part of a toggle joint (9) is arranged inside the limiting sliding block (24), and the first limiting column (22) can finally limit the swinging amplitude of a rocker arm (2) through the movement inside the limiting sliding block (24);
in the temperature compensation method, the other mode adopts a mode of double temperature compensation wires (15), namely a second limiting column (27) is arranged on one side of a vertical shaft (10) of the side wall of the air chamber, a third positioning column (28) is arranged vertically below the second limiting column (27), and the temperature compensation wires (15) are wound to the third positioning column (28) after passing through the second limiting column (27) and then are wound to the bottom for fixation;
the two modes are symmetrical structures, the temperature compensation line (15) stretches or grows along with the change of temperature, and the swing range of the toggle joint (9) is limited, so that the swing amplitude of the rocker arm (2) is increased or decreased, and the purpose of temperature compensation is achieved.
5. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress according to claim 4, wherein the method comprises the following steps of: in the temperature compensation method, for a temperature compensation film type gas meter, a first threading hole (29) and a second threading hole (32) are symmetrically formed on one side of a side cover (7), a first limiting hole (30) and a second limiting hole (31) are symmetrically formed on a parallel plate (6), one end of one temperature compensation line (15) is fixed on the first threading hole (29) of the side cover (7), then the temperature compensation line passes through the first limiting hole (30) and the second limiting hole (31) on the upper side and the lower side of the parallel plate (6), and finally a fixed point is selected according to the length after the temperature compensation line passes through the second threading hole (32);
in the temperature compensation method, a ring line (33) is arranged at the center line position of the free end of a coating film (4), the ring line (33) needs to adopt a metal thin line with larger elastic modulus and smaller temperature linear expansion coefficient, a traction fixed point (34) of a temperature compensation line (15) is arranged at a long-side symmetrical position 1/4, and a positioning hole (35) is correspondingly arranged on a parallel plate (6), wherein one temperature compensation line (15) is wound on a fourth positioning column (36) from the traction fixed point (34) of the ring line (33) through the positioning hole (35) on the parallel plate (6), and the fixed point is selected according to specific length, and the two modes are symmetrical structures.
6. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress according to claim 1, wherein the method comprises the following steps of: for the mechanical temperature compensation diaphragm gas meter, when the swing amplitude of the diaphragm (4) is reduced, the free part of the diaphragm (4) can form a circular arc-shaped bulge under the action of air pressure, and the free part of the diaphragm (4) can be divided into two sections, namely L1 and L2, wherein L2 is equal to the supporting surface of the side wall in length, L1 is a free expansion part and is the arc length of the expansion part; s1 is the reduction amplitude of the compensated rocker arm (2), arc-shaped bulges are integrally generated, and the nonlinear volume change quantity is the area formed by an arc and a chord thereof;
；
wherein the length of the free part is the arc length L in the moving process of the involucra, the chord length can be determined by the displacement and the fixed point, a is the arc central angle, and R is the radius;
the compensated deviation presents a nonlinear result;
when 20 degrees and-5 degrees are selected as the amplitude adjustment standard values, the deviation of the amplitude adjustment values and the volume change after compensation is smaller than 1% within the range of-25 to 20, the amplitude is approximately considered to be in a linear relation, the amplitude is reduced by 3mm, and the requirement can be met by 1.2 m of line length.
7. A method for addressing membrane gas meter temperature compensation using tensile stress as defined in claim 3 wherein: the response time of the temperature compensation line (15) is shorter than that of the bimetallic strip by more than 30 times, and the metering precision is greatly improved;
the range of swing is changed by utilizing the tensile stress generated by temperature change, so that the volume and heat capacity of a temperature stress body can be effectively reduced, the response time is greatly shortened, and the metering precision is improved;
when the amplitude of the rocker arm (2) in the air cavity is linearly reduced or increased, the problem of non-linearity of volume reduction or increase can occur, and the non-linearity error is corrected by fitting in a way that the rotation radius of the deflection shaft (12) on the gear disc (11) is changed into a corresponding curve.
8. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress according to claim 4, wherein the method comprises the following steps of: when the amplitude of the rocker arm (2) in the air cavity is linearly reduced or increased, the problem of non-linearity of the volume reduction or increase can occur, and the non-linearity error is corrected by adopting a mode that the inclined edge of the amplitude limiting sliding block (24) is changed into a corresponding curve, or designing the end part of the second amplitude limiting column (27) to be in a cam shape to be matched with a linear amplitude limiting wall, and fitting.
9. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress according to claim 5, wherein the method comprises the following steps of: the swing amplitude of the film-clamping plate (3) and the expansion and contraction amount of the temperature compensation line (15) are not in a linear relation, but approximate to a linear relation when the swing amplitude compensation amount is not too large.
10. The method for solving the temperature compensation of the membrane type gas meter by utilizing the tensile stress according to claim 5, wherein the method comprises the following steps of: according to the temperature compensation method, a cam (37) can be added at the far end of a temperature compensation line (15) and is fixed with the cam (37) in a single point, and nonlinear conversion output of linear change of the compensation line is realized in the temperature compensation process, so that the problem that the swing amplitude of a rotary volume temperature compensation rocker arm (2) is linearly changed and the volume change is nonlinear is solved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910142368.4A CN109738037B (en) | 2019-02-26 | 2019-02-26 | Method for solving temperature compensation of membrane type gas meter by using tensile stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910142368.4A CN109738037B (en) | 2019-02-26 | 2019-02-26 | Method for solving temperature compensation of membrane type gas meter by using tensile stress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109738037A CN109738037A (en) | 2019-05-10 |
| CN109738037B true CN109738037B (en) | 2024-01-26 |
Family
ID=66368465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910142368.4A Active CN109738037B (en) | 2019-02-26 | 2019-02-26 | Method for solving temperature compensation of membrane type gas meter by using tensile stress |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109738037B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174148B (en) * | 2019-06-18 | 2024-07-09 | 台州杜瑞仪表有限公司 | Gas meter with temperature compensation device |
| CN112525282B (en) * | 2020-11-24 | 2022-08-23 | 重庆市山城燃气设备有限公司 | Membrane module |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH335129A (en) * | 1955-03-30 | 1958-12-31 | Walter Hans Dipl-Ing Krefft | Plunger gas meter with a constant measuring volume, but adjustable length by means of a rocker arm actuated by a twist drive |
| GB1241796A (en) * | 1967-08-01 | 1971-08-04 | United Gas Industries Ltd | Improvements in dry gas meters |
| CN200941058Y (en) * | 2006-08-17 | 2007-08-29 | 宁波埃克美特燃气表有限公司 | Mechanical temp compensation gasmeter |
| CN201107069Y (en) * | 2007-11-19 | 2008-08-27 | 浙江三洲燃气表有限公司 | Membrane type gas meter with mechanical temperature inversion apparatus |
| EP1990613A1 (en) * | 2007-05-08 | 2008-11-12 | Carlos Roman Marron Legarreta | Mechanical temperature compensation gas meter |
| CN201765006U (en) * | 2009-09-15 | 2011-03-16 | 重庆市山城燃气设备有限公司 | Mechanical temperature converting membrane type gas meter |
| CN202329714U (en) * | 2011-12-02 | 2012-07-11 | 重庆精益仪表有限公司 | Temperature compensation membrane type gas meter |
| CN209296068U (en) * | 2019-02-26 | 2019-08-23 | 山东拙诚智能科技有限公司 | A kind of diaphragm gas meter solving temperature-compensating using tensile stress |
-
2019
- 2019-02-26 CN CN201910142368.4A patent/CN109738037B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH335129A (en) * | 1955-03-30 | 1958-12-31 | Walter Hans Dipl-Ing Krefft | Plunger gas meter with a constant measuring volume, but adjustable length by means of a rocker arm actuated by a twist drive |
| GB1241796A (en) * | 1967-08-01 | 1971-08-04 | United Gas Industries Ltd | Improvements in dry gas meters |
| CN200941058Y (en) * | 2006-08-17 | 2007-08-29 | 宁波埃克美特燃气表有限公司 | Mechanical temp compensation gasmeter |
| EP1990613A1 (en) * | 2007-05-08 | 2008-11-12 | Carlos Roman Marron Legarreta | Mechanical temperature compensation gas meter |
| CN201107069Y (en) * | 2007-11-19 | 2008-08-27 | 浙江三洲燃气表有限公司 | Membrane type gas meter with mechanical temperature inversion apparatus |
| CN201765006U (en) * | 2009-09-15 | 2011-03-16 | 重庆市山城燃气设备有限公司 | Mechanical temperature converting membrane type gas meter |
| CN202329714U (en) * | 2011-12-02 | 2012-07-11 | 重庆精益仪表有限公司 | Temperature compensation membrane type gas meter |
| CN209296068U (en) * | 2019-02-26 | 2019-08-23 | 山东拙诚智能科技有限公司 | A kind of diaphragm gas meter solving temperature-compensating using tensile stress |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109738037A (en) | 2019-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109738037B (en) | Method for solving temperature compensation of membrane type gas meter by using tensile stress | |
| CN201765006U (en) | Mechanical temperature converting membrane type gas meter | |
| US4055085A (en) | Motion amplifier for condition responsive gauge instrument | |
| CN101387498B (en) | Stay-supported optical fiber grating displacement sensor | |
| CN209296068U (en) | A kind of diaphragm gas meter solving temperature-compensating using tensile stress | |
| US4240298A (en) | Motion amplifier for condition responsive gauge instrument | |
| EP0134939A1 (en) | Temperature compensated gas meters | |
| CN210198464U (en) | Novel diaphragm type gas table cavity, lamella and compensator structure | |
| US4168631A (en) | Amplifier mounting construction for a pressure gauge | |
| CN102437777B (en) | External sensing device large displacement precision driving mechanism | |
| CN113153797A (en) | Hand regulating type mark swing angle regulator for electric fan | |
| US4015478A (en) | Direct-acting pressure sensor | |
| US3299705A (en) | Temperature compensator | |
| US3177714A (en) | Temperature compensated meter | |
| US2691305A (en) | Barometric altimeter | |
| CN201107069Y (en) | Membrane type gas meter with mechanical temperature inversion apparatus | |
| US2165744A (en) | Temperature compensating means for a measuring instrument | |
| US3986400A (en) | Pressure sensor with range adjustment | |
| US4361048A (en) | Pointer instrument movement | |
| US3253464A (en) | Automatic temperature compensation in gas meters | |
| CN201569459U (en) | Novel film-type gas meter | |
| CN113091841B (en) | Mechanical temperature compensation crank gear combination mechanism | |
| US4040296A (en) | Gas meter temperature compensating tangents | |
| EP0494760A2 (en) | Dry gas meter | |
| JPH025253B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |