WO2017197839A1 - 宽量程膜式燃气表 - Google Patents

宽量程膜式燃气表 Download PDF

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Publication number
WO2017197839A1
WO2017197839A1 PCT/CN2016/103552 CN2016103552W WO2017197839A1 WO 2017197839 A1 WO2017197839 A1 WO 2017197839A1 CN 2016103552 W CN2016103552 W CN 2016103552W WO 2017197839 A1 WO2017197839 A1 WO 2017197839A1
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WO
WIPO (PCT)
Prior art keywords
shaft
gas meter
rotating shaft
crank
wide
Prior art date
Application number
PCT/CN2016/103552
Other languages
English (en)
French (fr)
Inventor
邵泽华
Original Assignee
成都秦川科技发展有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 成都秦川科技发展有限公司 filed Critical 成都秦川科技发展有限公司
Priority to LTEP16902218.3T priority Critical patent/LT3460418T/lt
Priority to JP2018555103A priority patent/JP6652660B2/ja
Priority to EP16902218.3A priority patent/EP3460418B1/en
Priority to ES16902218T priority patent/ES2882036T3/es
Priority to US16/301,715 priority patent/US20190293463A1/en
Publication of WO2017197839A1 publication Critical patent/WO2017197839A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/20—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows
    • G01F3/22—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/38—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/08—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the diaphragm or bellows type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/20—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows
    • G01F3/22—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases
    • G01F3/221—Valves therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/20—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows
    • G01F3/22—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases
    • G01F3/222—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases characterised by drive mechanism for valves or membrane index mechanism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/20—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows
    • G01F3/22—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases
    • G01F3/227—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases characterised by the means for transfer of membrane movement information to indicating means
    • G01F3/228—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases characterised by the means for transfer of membrane movement information to indicating means using mechanical transmission means

Definitions

  • the invention relates to the technical field of gas meter devices, in particular to a wide-range membrane gas meter.
  • the existing membrane type gas meter has a flexible rubber member, and the transmission mechanism is composed of plastic parts. It is difficult to ensure the accuracy in the manufacturing process.
  • the tooth sleeve of the driving counter By changing the tooth sleeve of the driving counter, the number of teeth of the teeth is adjusted, and the gas meter standard inspection equipment is used. Check to meet the requirements. Due to the wide error distribution and limited number of gears, there is a certain range and gear position for adjusting the accuracy of the gas meter, so the accuracy is not enough.
  • the present invention is implemented as follows:
  • the present invention provides a wide-range membrane gas meter
  • a movement comprising a bellows, two membranes, two membrane covers, a valve seat, a valve cover, a fine adjustment device, and under the alternating movement of the two membranes, driving the valve cover relative to the Two sets of four-axis joint systems with one-way rotation of the valve seat, wherein:
  • the valve seat is coupled to the bellows
  • the valve cover is slidably coupled to the valve seat
  • the bellows includes two metering chambers, the two membranes being respectively located in the two metering chambers, each The film partitions the corresponding metering chamber into two metering chambers; each of the membranes is coupled to a corresponding four-axis joint system, each set of the four-axis joint system including a connecting rod, a rocker a lever, a vertical shaft, a center shaft, a crank, and a center crank wheel having a transmission tooth, wherein the vertical shaft is a first rotation shaft fixedly coupled to one end of the rocker, and the other end of the rocker is hinged to the connecting rod One end of the rocker, the rotating shaft connected to the connecting rod is a second rotating shaft, the other end of the connecting rod is hinged to the crank, and the central axis of the crank is a third rotating shaft, the central crank Wheel cover is provided in On the central axis, the central axis is
  • the deviation between the mounting limit position of the film and the optimal limit position is within -0.5 mm to +0.5 mm, the angular error of the rocker is within -0.8° to +0.8°, and the fine adjustment device is installed at the center a crank wheel for adjusting a position of the air inlet of the valve cover relative to the valve seat when the film is in an extreme position, and the film in the metering chamber is in a non-tensioned state, wherein the limit position is
  • the third rotating shaft is located in a plane formed by the fourth rotating shaft and the second rotating shaft.
  • the four-axis joint system further includes a front flag and a rear flag, one of the films is driven to be connected to one of the vertical shafts by the front flag, and the other film is driven to be connected to the other by the rear flag.
  • the vertical shaft, the reciprocating linear motion of the film rotates the corresponding vertical shaft.
  • the movement further comprises a membrane stent, the membrane being mounted on the capsule by the membrane stent.
  • the first rotating shaft, the second rotating shaft, the third rotating shaft and the fourth rotating shaft in the four-axis joint system are parallel to each other and perpendicular to a plane where the central crank wheel is located.
  • the fine adjustment device comprises a dial wheel and a pointer body
  • the center crank wheel is provided as a pointer plate
  • the dial wheel is mounted with a mounting shaft and a hollow cam shaft
  • the mounting shaft and the cam shaft are located at the The two sides of the plane on which the dial wheel is located, the transmission teeth are mounted on the cam shaft, and the cam shaft, the mounting shaft and the transmission wheel are coaxially disposed; the crank is mounted on the pointer plate
  • the dial plate is further provided with a center hole coaxial with the core hole, an eccentric hole and a continuous scale groove.
  • the mounting shaft is inserted into the center hole, and the upper and lower ends of the eccentric hole are respectively provided with Two grooves communicating with the eccentric hole, the groove at the lower end of the eccentric hole communicating with the center hole, and the two grooves are oppositely disposed and connected by the diameter of the eccentric hole, and are located at the lower end a groove bottom of the groove is located between the center hole and the eccentric hole;
  • a needle end of the pointer body is provided with a protrusion for clamping in the scale groove
  • a needle end of the pointer body is provided with a rotation shaft
  • an outer circumferential surface of the rotation shaft is provided with a snap portion.
  • the engaging portion protrudes outward in a radial direction of the rotating shaft
  • a circumferential surface of the mounting shaft is provided with a snap groove
  • the snap groove is recessed inward along a radial direction of the mounting shaft, the mounting
  • the shaft and the pointer disc are axially positioned and connected by the engaging portion and the snap groove; the lower end of the rotating shaft is provided with an eccentric pin;
  • a strip hole is disposed on the wheel surface of the dial, the length direction of the strip hole extends along a radial direction of the transmission wheel, and the eccentric pin is inserted into the strip hole.
  • each of the grooves is a semicircular groove, and a radius of the semicircular groove is larger than a radius of the eccentric hole, and correspondingly, the engaging portion is disposed in a semicircular shape.
  • a line connecting the rotating shaft and the center hole and a line connecting the crank and the center hole intersect at an acute angle, and a side of the pointer body adjacent to the center hole is set as an arc The face is recessed toward the other side.
  • each of the vertical shafts is made of a metal material.
  • the wide-range membrane gas meter further includes a counter, and an output end of the movement is connected to an input end of the counter.
  • the movement comprises a transition tooth, an axial tooth, a tooth sleeve and an adjusting tooth
  • the transition tooth is connected to the transmission wheel by a gear
  • an output end of the transition tooth is connected with an input end of the axial tooth Engaged
  • the output end of the axial tooth engages with the input end of the adjustment tooth
  • the output end of the adjustment tooth engages with the input end of the counter.
  • the present invention provides a wide-range membrane type gas meter, which is simple and reasonable in structure, convenient in processing and manufacturing, and low in manufacturing cost, and at the same time, the transmission structure of the wide-range membrane type gas meter Reasonable, the transmission parts run smoothly, the operation is safe and reliable; the gas meter has good measurement accuracy and high measurement precision, and expands the applicable range of the wide-range membrane type gas meter. details as follows:
  • the wide-range membrane type gas meter comprises a movement, the movement is used for the circulation of gas, that is, the gas is introduced into the measuring chamber with a constant volume, and is discharged after being filled.
  • the gas is inflated and exhausted through a reasonable transmission mechanism. The number of times is converted into a volume, and the transmission mechanism is connected to the counter, and the flow of the gas is reflected on the counter and displayed, thereby realizing the measurement of the gas.
  • Inflating, exhausting During the process, the flow of the gas drives the film to reciprocate in the metering chamber, and the reciprocating movement of the film is converted into the rotation of the valve cover, and the rotation of the valve cover is transmitted to the counter to measure the flow rate of the gas.
  • each four-bar subsystem passes through two extreme positions.
  • the membrane needs to change the direction of motion so that the four-bar subsystem crosses the extreme position.
  • the extreme position of the film is accurately positioned by the positioning device.
  • the deviation between the mounting limit position of the film and the optimal limit position is within -0.5 mm to +0.5 mm, and the angular error of the rocker In the range of -0.8° to +0.8°, adjust the fine adjustment device to adjust the position of the air inlet of the valve cover relative to the valve seat when the film is at the limit position, thereby adjusting the timing of the intake or exhaust of the metering chamber.
  • the flow direction is changed, the pressure on both sides of the film is equalized, and the film in the metering chamber is in a non-tensioned state, the gas flow state is stable, the gas pressure loss is small, and the gas does not consume excess energy in the film.
  • the gas does not work on the membrane, preventing the gas from performing work on the membrane and causing energy loss.
  • the volume of the gas flowing out in the metering chamber is more accurate, that is, the volume of the rotation is more accurate, and the accuracy of the measurement is improved.
  • FIG. 1 is a structural view of a wide-range membrane type gas meter provided by the present invention.
  • FIG. 2 is a plan view of a wide-range membrane gas meter provided by the present invention.
  • FIG. 3 is a top plan view of a fine adjustment device for a wide-range membrane gas meter according to the present invention.
  • FIG. 4 is a top plan view of a pointer disk of a wide-range membrane gas meter provided by the present invention.
  • Figure 5 is a cross-sectional view of a fine adjustment device for a wide-range membrane gas meter according to the present invention.
  • Card slot 201 eccentric hole 202, recess 203, pointer body 204, rotating shaft 205, dial 206, strip hole 207, eccentric pin 208, connecting plate 209, snap groove 210, snap portion 211, camshaft 212, mounting shaft 213, curved surface 214, graduation groove 215, center hole 216,
  • Transition tooth 301 Transition tooth 301, axial tooth 302, tooth sleeve 303, adjustment tooth 304, counter 305.
  • the existing membrane type gas meter has a flexible rubber member, and the transmission mechanism is composed of plastic parts. It is difficult to ensure the accuracy in the manufacturing process.
  • the tooth sleeve of the driving counter By changing the tooth sleeve of the driving counter, the number of teeth of the teeth is adjusted, and the gas meter standard inspection equipment is used. Check to meet the requirements. Due to the wide error distribution and limited number of gears, there is a certain range and gear position for adjusting the accuracy of the gas meter, so the accuracy is not enough.
  • the designer of the present invention designs a wide-range membrane type gas meter, which is simple and reasonable in structure, convenient in processing and manufacturing, and at the same time, the wide-range membrane type gas meter adjusts the position of the crank.
  • the change of the airflow direction during the movement of the movement precedes the inversion of the film, so that the pressure on both sides is balanced before the film reaches the limit position, so that the movement of the movement is more stable and the measurement accuracy is improved.
  • the terms “set”, “install”, “connected”, and “connected” are to be understood broadly, and may be fixed connections, for example, unless otherwise specifically defined and defined. It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be internal communication between the two elements.
  • the specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
  • a and D are respectively the swing end shaft of the corresponding rocker 103 and the swing end shaft of the connecting rod 102, that is, the second rotating shaft, and B is the rotating shaft of the center crank wheel 101. That is, the fourth rotating shaft, C is the rotating shaft of the crank 600, that is, the third rotating shaft, and a is the angle (limit angle) between the notched edge of the valve cover 400 and the boundary rib of the measuring chamber 500.
  • the embodiment provides a wide-range membrane gas meter, including a movement 100, which includes a capsule 200, two membranes 300, two membrane covers, a valve cover 400, a valve seat, a fine adjustment device, and Under the alternating movement of the two membranes 300, a four-axis linkage system that drives the bonnet 400 to rotate unidirectionally relative to the valve seat, wherein:
  • the valve seat is connected to the bellows 200, and the valve cover is slidably connected to the valve seat.
  • the capsule 200 includes two metering chambers, and the two membranes 300 are respectively located in the two metering chambers, and each of the membranes 300 will correspond to
  • the metering chamber is divided to form two metering chambers 500, that is, a two-membrane four-chamber structure; four metering chambers 500 are divided into two groups, two metering chambers 500 are a group, and two metering chambers of each group 500 alternating intake and exhaust, the valve cover 400 is provided with an air inlet and an air outlet, and when the valve cover 400 is rotated around the central shaft by the central crank wheel, the air inlet of the valve cover 400 and the corresponding metering chamber 500 is connected, the metering chamber 500 is in an intake state, the metering chamber 500 opposite to the metering chamber 500 is in an outflow state, and the two metering chambers 500 are in different states, thereby generating
  • the deviation between the installation limit position of the film and the optimal limit position is within -0.5mm to +0.5mm, that is, the installation error of the film is within -0.5mm to +0.5mm, and the angular error of the rocker is -0.8° to + Within 0.8°, the installation position of the film is more accurate, the position of the rocker is more accurate, and the gas meter has small error in operation and high precision.
  • the extreme position means that the third rotating shaft is located in a plane formed by the fourth rotating shaft and the second rotating shaft.
  • the four-axis linkage system includes a connecting rod 102, a rocker 103, a vertical shaft 106, a center shaft, a crank 600, and a center crank wheel 101 having a transmission tooth, and the center crank wheel is sleeved on the central shaft, a valve cover coaxially disposed with the central crank wheel, the central crank wheel rotating about the central shaft to rotate the valve cover synchronously about the central axis, and an output end of each of the coatings is connected to the corresponding vertical shaft
  • the vertical shaft is a first rotating shaft, one end of the rocking rod is sleeved on the vertical shaft, and rotates synchronously with the vertical shaft, and the other end of the rocking rod is hinged to one end of the connecting rod, the central crank A crank is disposed on the wheel, and the other end of the link is hinged to the crank.
  • the film 300 reciprocates under the force of the air pressure difference in the corresponding metering chamber and drives the rocker 103 to move.
  • the rocker 103 swings to drive the connecting rod 102 to rotate, and the connecting rod 102 and the center crank wheel 101 are connected by the crank 600.
  • the rotation of the rod 102 drives the central crank wheel 101 to rotate, thereby driving the valve cover 400 to rotate relative to the valve seat.
  • the air inlet and the air outlet of the valve cover 400 communicate with different metering chambers 500 to complete intake or exhaust. cycle.
  • the two membranes 300 each have two extreme positions, which means that the third shaft is in a plane formed by the fourth shaft and the second shaft, in order to overcome the limit. Position, the film 300 changes direction of movement by flipping.
  • the pressure difference between the two metering chambers 500 that are matched is zero to the center crank wheel 101, and the film 300 at the extreme position is completely moved by the other film 300.
  • the central crank wheel 101 is separately driven to rotate beyond the limit position, and the transmission mode of the film 300 is deteriorated in the extreme position, and the accuracy of the gas meter is lowered. Measurement accuracy is reduced.
  • the wide-range membrane gas meter provided by the embodiment includes a fine adjustment device for adjusting the position of the air inlet of the valve cover relative to the valve seat when the film is in the limit position, and the positioning device when installing the gas meter.
  • a fine adjustment device for adjusting the position of the air inlet of the valve cover relative to the valve seat when the film is in the limit position
  • the positioning device when installing the gas meter.
  • the pressure on both sides of the film is equalized, and the film in the metering chamber is in a non-tensioned state, the gas flow state is stable, the gas pressure loss is small, and the valve cover 400 is before the film reaches the limit position. Opening the inlet of the metering chamber 500 that has not been emptied, so that the change in the direction of the airflow precedes the steering of the membrane 300, so that when the membrane 300 reaches the extreme position, the two sides are turned The pressure has been equalized, the movement of the movement 100 is more stable, and the measurement accuracy is improved.
  • the film When the film is in the extreme position, the film can drive it over the limit position under the flow of the gas in its corresponding two metering chambers, not only relying on the movement of the other film to drive it over the limit position, but also reduce the driving film beyond the limit position.
  • the lost energy increases the accuracy of the measurement and also improves the measurement accuracy of the gas meter.
  • the film When the film is at the limit position, the film is in a non-tensioned state, that is, the gas does not work on the whole film during the movement, and the film does not consume excess energy, thereby improving the accuracy of the rotary volume and entering the metering chamber.
  • the volume difference between the gas volume and the metering is reduced, which further improves the accuracy of the gas meter and its measurement accuracy.
  • the four-axis joint system further includes a front flag 104 and a rear flag 105.
  • One of the films 300 is drivingly coupled to one of the vertical shafts 106 through the front flag 104.
  • the other film 300 is driven and connected to the other vertical shaft 106 through the rear flag 105.
  • the reciprocating linear motion of the film 300 causes the corresponding vertical shaft 106 to rotate, and the film 300 is connected through the front flag 104 or the rear flag 105.
  • the vertical shaft 106 is connected to the rocker 103 through the vertical shaft 106, and the film 300 is moved to drive the movement of the four-axis joint system, thereby finally realizing the rotation of the valve cover 400 relative to the valve seat.
  • the front flag 104, the rear flag 105, the rocker 103 and the connecting rod 102 are accurately positioned during installation, the cooperation relationship of each component is good, and the accuracy of the rotary volume is high, thereby improving the accuracy of the gas meter.
  • the movement 100 further includes a film holder 107, and the film 300 is mounted on the capsule 200 through the film holder 107.
  • the film 300 is conveniently installed, and after the film 300 is installed, The positional accuracy is high, thereby improving the installation accuracy of the entire mechanism, the movement 100 is more stable during operation, and the measurement accuracy of the wide-range membrane gas meter is high.
  • the first rotating shaft, the second rotating shaft, the third rotating shaft and the fourth rotating shaft in the four-axis joint rotation system are parallel to each other, and perpendicular to the plane where the center crank wheel is located, the gas meter operates smoothly, and the transmission More flexible.
  • the gas meter provided by the embodiment improves the position accuracy of the front flag 104, the rear flag 105, the rocker 103 and the connecting rod 102 when the gas meter is installed, thereby ensuring the accuracy of the limit position of the film 300 during the movement process.
  • the middle film is always in a non-tensioned state, which improves the accuracy of the rotary volume, thereby ensuring the measurement accuracy of the gas meter.
  • the gas meter provided by the embodiment has high accuracy, is adjusted in a small range by the fine adjustment device, and has high adjustment precision, and provides a gas meter with high accuracy and high precision.
  • the fine adjustment device includes a dial 206 and a pointer body 204.
  • the center crank wheel 101 is configured as a pointer disk, and the dial 206 is mounted with a mounting shaft 213.
  • a hollow camshaft 212, the mounting shaft 213 and the camshaft 212 are located on two sides of the dial 206, the transmission teeth 108 are mounted on the camshaft 212, and the camshaft 212, the The mounting shaft 213 and the transmission wheel are coaxially disposed; the crank 600 is mounted on the pointer plate, and the pointer plate is further provided with a center hole 216 coaxial with the core hole 216, and an eccentric hole 215
  • the mounting shaft 213 is inserted into the center hole 216, and the upper and lower ends of the eccentric hole 202 are respectively provided with two grooves communicating with the eccentric hole 202.
  • the groove 203 located at the lower end of the eccentric hole 202 communicates with the center hole 216, and the two grooves 203 are oppositely disposed and communicated with the diameter of the eccentric hole 202, and the concave portion at the lower end
  • the groove bottom of the groove 203 is located between the center hole 216 and the eccentric hole 202;
  • the needle end of the pointer body 204 is provided with a protrusion for clamping in the scale groove 215, and the needle end of the pointer body 204 is provided with a rotating shaft 205, and the outer peripheral surface of the rotating shaft 205 is provided with a card.
  • the engaging portion 211, the engaging portion 211 protrudes outward in the radial direction of the rotating shaft 205, the peripheral surface of the mounting shaft 213 is provided with a snap groove 201, and the engaging groove 201 is along the mounting shaft
  • the 213 is radially inwardly recessed, the mounting shaft 213 and the pointer plate are axially positioned and connected by the engaging portion 211 and the snap groove 201; the lower end of the rotating shaft 205 is provided with an eccentric pin 208;
  • a strip hole 207 is disposed on the wheel surface of the dial wheel 206.
  • the length direction of the strip hole 207 extends along a radial direction of the transmission wheel, and the eccentric pin 208 is inserted into the strip hole 207. Inside.
  • the pointer body 204 rotates relative to the pointer disk about the axis of the rotating shaft 205, and at the same time, the eccentric pin 208 of the lower end of the rotating shaft 205 moves, because the eccentric pin 208 is located in the strip hole 207 on the dial 206,
  • the dial 206 is inserted into the dial plate through the mounting shaft.
  • the cam shaft is provided with a connecting plate that is inserted and connected with the valve cover 400. The connecting plate is located below the driving wheel, and the eccentric pin 208 is subjected to the side wall of the strip hole 207 when rotated.
  • the dial 206 does not rotate synchronously with the eccentric pin 208, the urging force of the eccentric pin 208 is transmitted to the rotating shaft 205 by itself, and the outer peripheral surface of the rotating shaft 205 is fitted to the inner wall of the eccentric hole 202, and has mutual The function of squeezing realizes the action of the rotating shaft 205 to press the pointer disc, so that the eccentric pin 208 slides in the strip hole 207 to rotate the pointer coiling mounting shaft, and the crank 600 is fixedly connected with the pointer disc, thereby changing the crank 600.
  • the position which in turn changes the position of the valve cover 400, changes the limit angle a, so that the position of the air inlet of the valve cover 400 and the exhaust hole communicate with the metering chamber 500 is changed, thereby improving the gas meter. Measurement accuracy.
  • each of the grooves 203 is a semi-circular groove, and a radius of the semi-circular groove is larger than a radius of the eccentric hole 202.
  • the engaging portion 211 is configured to Semi-circular, when the pointer body rotates, the engaging portion 211 is rotated to the concave end of the lower end of the eccentric hole 202 After the slot 203 is inward, the pointer body 204 does not move along the axis direction of the eccentric hole 202, and the position of the pointer body 204 is not easily changed, which ensures that the accuracy of the gas meter does not change after adjustment, and the groove 203 is set as a semi-circular groove, and is engaged.
  • the portion 211 is provided as a semi-circular plate, which facilitates the rotation of the pointer body 204, and the fitting is more compact, and the adjustment precision is higher.
  • a line connecting the rotating shaft 205 and the center hole 216 and a line connecting the crank 600 and the center hole 216 intersect at an acute angle, and the pointer body 204 is close to One side of the center hole 216 is disposed as a curved surface 214, and the curved surface 214 is recessed toward the other side.
  • one side of the pointer body 204 is disposed as a curved surface 214, and the pointer body 204 faces the crank.
  • the wide-range membrane gas meter further includes a counter 305, an output end of the movement 100 is connected to an input end of the counter 305, and the movement 100 operates to inflate a gas.
  • the number of times of exhausting is converted into a volume by the transmission mechanism, and then reacted on the counter 305 to realize the measurement of the gas.
  • the movement 100 includes a transition tooth 301 , an axial tooth 302 , a tooth sleeve 303 , and an adjustment tooth 304 .
  • the transition tooth 301 connects the center crank wheel 101 through a gear.
  • the output end of the transition tooth 301 meshes with the input end of the axial tooth 302, the output end of the axial tooth 302 meshes with the input end of the adjusting tooth 304, and the output of the adjusting tooth 304
  • the end is engaged with the input of the counter 305.
  • the transmission mechanism is stable and reliable, the connection structure of the movement 100 and the counter 305 is simple, the error in the transmission process is small, and the reading on the counter 305 is more accurate.
  • the film 300 provided by the present embodiment is made of polyester gauze, and the valve cover 400 is injection molded by using a modified phenolic resin.
  • the film holder 107, the front flag 104, the rear flag 105, the rocker 103, the connecting rod 102, and the indicator plate are formed.
  • the pointer body, the center crank wheel 101, and the bellows 200 are all injection molded using POM plastic.
  • the vertical shaft 106 is preferably made of a metal material.

Abstract

一种宽量程膜式燃气表，包括机芯（100），机芯（100）包括膜盒（200）、两个皮膜（300）、两个膜盖、阀盖（400）和四轴联转系统，膜盒（200）包括阀座和两个计量室，两个皮膜（300）分别位于两个计量室内；每个所述皮膜（300）与相应的所述四轴联转系统相连接，立轴（106）与摇杆（103）的一端固定连接，摇杆（103）的另一端铰接于连杆（102）的一端，连杆（102）的另一端铰接于曲柄（600），曲柄（600）的中心轴（C）为第三转轴，中心曲柄轮（101）套设在中轴（B）上，阀盖（400）与中心曲柄轮（101）同轴设置，中心曲柄轮（101）绕中轴（B）转动令阀盖（400）绕中轴（B）同步转动，皮膜（300）的安装极限位置与最佳极限位置的偏差在-０．５ｍｍ至＋０．５ｍｍ内，摇杆（103）的角度误差在-０．８°至＋０．８°内，微调装置安装于中心曲柄轮（101）。燃气表的测量准确性好、测量精度高，扩大了膜式燃气表的适用范围。

Description

宽量程膜式燃气表 技术领域
本发明涉及燃气表设备技术领域，具体而言，涉及一种宽量程膜式燃气表。
背景技术
现有膜式燃气表由于皮膜是具有柔性的橡胶件，传动机构由塑料零件构成，在制造工程中精度难以保证，通过改变驱动计数器的齿套，调节齿的齿数并用燃气表标准校检设备校检来达到要求。由于误差分布宽，齿轮数量有限，调整燃气表精度有一定范围和档位，所以精度不够。
发明内容
本发明的目的在于提供一种宽量程膜式燃气表，以改善现有技术的膜式燃气表运行稳定性差导致燃气表的测量准确性差、精度低的问题。
本发明是这样实现的：
基于上述目的，本发明提供了一种宽量程膜式燃气表，
包括机芯，所述机芯包括膜盒、两个皮膜、两个膜盖、阀座、阀盖、微调装置以及在所述两个皮膜的交替运动下，驱动所述阀盖相对于所述阀座单向转动的两组四轴联转系统，其中：
所述阀座与所述膜盒相连接，所述阀盖与所述阀座滑动连接，所述膜盒包括两个计量室，所述两个皮膜分别位于所述两个计量室内，每个所述皮膜将对应的所述计量室分隔形成两个计量腔室；每个所述皮膜与相应的所述四轴联转系统相连接，每组所述四轴联转系统包括连杆、摇杆、立轴、中轴、曲柄以及具有传动齿的中心曲柄轮，其中，所述立轴为第一转轴，与所述摇杆的一端固定连接，所述摇杆的另一端铰接于所述连杆的一端，所述摇杆与所述连杆相连接的转动轴为第二转轴，所述连杆的另一端铰接于所述曲柄，所述曲柄的中心轴为第三转轴，所述中心曲柄轮套设在所述 中轴上，所述中轴为第四转轴，所述阀盖与所述中心曲柄轮同轴设置，所述中心曲柄轮绕所述中轴转动令所述阀盖绕所述中轴同步转动；
所述皮膜的安装极限位置与最佳极限位置的偏差在-0.5mm至+0.5mm内，所述摇杆的角度误差在-0.8°至+0.8°内，所述微调装置安装于所述中心曲柄轮，用于调整皮膜处于极限位置时所述阀盖的进气口相对于所述阀座的位置，且所述计量腔室内的皮膜处于非张紧状态，其中，所述极限位置是指所述第三转轴位于所述第四转轴和所述第二转轴所形成的平面内。
优选的，所述四轴联转系统还包括前旗以及后旗，一个所述皮膜通过所述前旗驱动连接于一个所述立轴，另一所述皮膜通过所述后旗驱动连接于另一所述立轴，所述皮膜往复直线运动令相应的所述立轴转动。
优选的，所述机芯还包括皮膜支架，所述皮膜通过所述皮膜支架安装于所述膜盒上。
优选的，所述四轴联转系统中的所述第一转轴、所述第二转轴、所述第三转轴以及所述第四转轴相互平行，且垂直于所述中心曲柄轮所在的平面。
优选的，所述微调装置包括拨轮以及指针本体，所述中心曲柄轮设置为指针盘，所述拨轮上安装有安装轴以及中空的凸轮轴，所述安装轴与所述凸轮轴位于所述拨轮所在平面的两侧，所述传动齿安装于所述凸轮轴上，且所述凸轮轴、所述安装轴以及所述传动轮同轴设置；所述曲柄安装于所述指针盘上，所述指针盘上还设置有与其同轴的圆心孔、偏心孔以及连续的刻度槽，所述安装轴插装于所述圆心孔内，所述偏心孔的上下两端分别设置有与所述偏心孔连通的两个凹槽，位于所述偏心孔下端的所述凹槽连通所述圆心孔，两个所述凹槽以所述偏心孔的直径为界相对设置且连通，位于下端的所述凹槽的槽底位于所述圆心孔与所述偏心孔之间；
所述指针本体的针头端设置有用于卡紧在所述刻度槽内的凸起，所述指针本体的针尾端设置有转动轴，所述转动轴的外周面设置有卡接部，所 述卡接部沿所述转动轴的径向向外凸出，所述安装轴的周面设置有卡接槽，所述卡接槽沿所述安装轴的径向向内凹陷，所述安装轴与所述指针盘通过所述卡接部和所述卡接槽轴向定位连接；所述转动轴的下端设置有偏心销；
所述拨轮的轮面上设置有条形孔，所述条形孔的长度方向沿所述传动轮的径向方向延伸，所述偏心销插装于所述条形孔内。
优选的，每个所述凹槽为半圆槽，且所述半圆槽的半径大于所述偏心孔的半径，相应的，所述卡接部设置为半圆形。
优选的，所述转动轴与所述圆心孔的连线和所述曲柄与所述圆心孔的连线相交且夹角为锐角，所述指针本体的靠近所述圆心孔的一侧面设置为弧面，所述弧面朝向另一侧面凹陷。
优选的，每个所述立轴采用金属材料制成。
优选的，所述宽量程膜式燃气表还包括计数器，所述机芯的输出端连接所述计数器的输入端。
优选的，所述机芯包括过渡齿、轴向齿、齿套以及调节齿，所述过渡齿通过齿轮连接所述传动轮，所述过渡齿的输出端与所述轴向齿的输入端相啮合，所述轴向齿的输出端与所述调节齿的输入端相啮合，所述调节齿的输出端与所述计数器的输入端相啮合。
本发明的有益效果是：
综上所述，本发明提供了一种宽量程膜式燃气表，该宽量程膜式燃气表的结构简单合理，加工制造方便，制造成本低，同时，该宽量程膜式燃气表的传动结构合理，传动件的运行平稳，运行安全可靠；燃气表的测量准确性好、测量精度高，扩大了宽量程膜式燃气表的适用范围。具体如下：
该宽量程膜式燃气表包括机芯，机芯用于燃气的流通，即气体通入体积恒定的计量室，充满后再排出，在此过程中，通过合理的传动机构，把充气、排气的次数转换为体积，传动机构在连接于计数器上，进而将气体的流通量反应在计数器上并显示出来，实现了气体的测量。在充气、排气 过程中，气体的流动带动皮膜在计量室内往复移动，皮膜的往复移动转化为阀盖的转动，阀盖转动传递给计数器，实现气体的流量的计量。在皮膜运动过程中，每个四杆子系统会经过两个极限位置，在极限位置时，皮膜需要改变运动方向使得四杆子系统越过极限位置。本实施例中，通过定位装置将皮膜的极限位置准确定位，安装后，所述皮膜的安装极限位置与最佳极限位置的偏差在-0.5mm至+0.5mm内，所述摇杆的角度误差在-0.8°至+0.8°内，再通过调整微调装置调节皮膜处于极限位置时阀盖的进气口相对于阀座的位置，从而调节计量腔室进气或者排气的时机，在皮膜达到极限位置前，完成气流方向的转换，使皮膜两侧的压力均衡，且计量腔室内的皮膜处于非张紧状态，气体流态稳定，气体压损波动小，气体不会耗费多余的能量在皮膜上，气体不会对皮膜做功，防止了气体对皮膜做功而导致能量损失的情况，气体在计量腔室内流出的体积更加准确，即回转体积更加准确，提高了计量的精度。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本发明的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本发明提供的宽量程膜式燃气表的结构图；
图2为本发明提供的宽量程膜式燃气表的俯视图；
图3为本发明提供的宽量程膜式燃气表的微调装置的俯视图；
图4为本发明提供的宽量程膜式燃气表的指针盘的俯视图；
图5为本发明提供的宽量程膜式燃气表的微调装置的截面图。
附图标记汇总：
机芯100，膜盒200，皮膜300，阀盖400，计量腔室500，曲柄600，
中心曲柄轮101，连杆102，摇杆103，前旗104，后旗105，立轴106，皮膜支架107，传动齿108，
卡接槽201，偏心孔202，凹槽203，指针本体204，转动轴205，拨轮206，条形孔207，偏心销208，连接板209，卡接槽210，卡接部211，凸轮轴212，安装轴213，弧面214，刻度槽215，圆心孔216，
过渡齿301，轴向齿302，齿套303，调节齿304，计数器305。
具体实施方式
现有膜式燃气表由于皮膜是具有柔性的橡胶件，传动机构由塑料零件构成，在制造工程中精度难以保证，通过改变驱动计数器的齿套，调节齿的齿数并用燃气表标准校检设备校检来达到要求。由于误差分布宽，齿轮数量有限，调整燃气表精度有一定范围和档位，所以精度不够
鉴于此，本发明的设计者设计了一种宽量程膜式燃气表，该宽量程膜式燃气表结构简单合理，加工制造方便，同时，该宽量程膜式燃气表通过调整曲柄的位置，使得机芯运行过程中气流方向的改变先于皮膜的翻转，从而当皮膜到达极限位置翻转前，两侧的压力已经均衡，使机芯的运动更加平稳，测量精度提高。
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本发明实施例的组件可以以各种不同的配置来布置和设计。因此，以下对在附图中提供的本发明的实施例的详细描述并非旨在限制要求保护的本发明的范围，而是仅仅表示本发明的选定实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本发明的描述中，还需要说明的是，除非另有明确的规定和限定，术语“设置”、“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
请参阅图1-5，图1中，A和D分别为对应的摇杆103的摆动端轴和连杆102的摆动端轴，即为第二转轴，B为中心曲柄轮101的转动轴，即为第四转轴，C为曲柄600的转动轴，即为第三转轴，a为阀盖400缺口边与计量腔室500的分界筋的夹角(极限角)。本实施例提供了一种宽量程膜式燃气表，包括机芯100，所述机芯100包括膜盒200、两个皮膜300、两个膜盖、阀盖400、阀座、微调装置以及在所述两个皮膜300的交替运动下，驱动所述阀盖400相对于所述阀座单向转动的四轴联转系统，其中：
阀座与膜盒200相连接，阀盖与阀座滑动连接，所述膜盒200包括两个计量室，所述两个皮膜300分别位于所述两个计量室内，每个皮膜300将对应的所述计量室分隔形成两个计量腔室500，即为两膜四腔结构；四个计量腔室500分为两组，两个计量腔室500为一组，每组的两个计量腔室500交替进气和排气，阀盖400上设置有进气口和出气口，当阀盖400在中心曲柄轮带动下绕中轴转动时，阀盖400的进气口与相应的计量腔室500连通，该计量腔室500处于进气状态，与该计量腔室500相对的计量腔室500为出气状态，两个计量腔室500处于不同的状态，进而产生了气压差，该气压差推动皮膜300在计量室内往复移动，皮膜300的移动通过传动组件输出给计数器305，在计数器305上反应处数值，进而得到了燃气的流量。 在一般情况下，两组计量腔室500中均有处于进气状态的进气腔和处于排气状态的排气腔，气体往复交替的进入四个计量腔室500。
皮膜的安装极限位置与最佳极限位置的偏差在-0.5mm至+0.5mm内，即皮膜的安装误差在-0.5mm至+0.5mm内，所述摇杆的角度误差在-0.8°至+0.8°内，皮膜的安装位置更加准确，摇杆的位置更加准确，燃气表运行时误差小，精度高。极限位置是指第三转轴位于第四转轴和第二转轴所形成的平面内。
所述四轴联转系统包括连杆102、摇杆103、立轴106、中轴、曲柄600以及具有传动齿的中心曲柄轮101，所述中心曲柄轮套设在所述中轴上，所述阀盖与所述中心曲柄轮同轴设置，所述中心曲柄轮绕所述中轴转动令所述阀盖绕所述中轴同步转动，每个所述皮膜的输出端连接相应的所述立轴，所述立轴为第一转轴，所述摇杆的一端套设于所述立轴，且与所述立轴同步转动，所述摇杆的另一端铰接于所述连杆的一端，所述中心曲柄轮上设置有曲柄，所述连杆的另一端铰接于所述曲柄。皮膜300在相应的计量腔室内在气压差的作用力下往复移动且带动摇杆103运动，摇杆103摆动带动连杆102转动，连杆102与中心曲柄轮101通过曲柄600连接，两个连杆102的转动带动中心曲柄轮101转动，进而带动了阀盖400相对于阀座转动，阀盖400的进气口和出气口与不同的计量腔室500连通，完成进气或者排气，如此循环。
在机芯100运行过程中，两个皮膜300均具有两个极限位置，该极限位置是指所述第三转轴在所述第四转轴和所述第二转轴所形成的平面内，为了越过极限位置，皮膜300通过翻转来改变运动方向。现有技术中，由于皮膜300运动至极限位置时，相配合的两个计量腔室500的气压差对中心曲柄轮101的力矩为零，处于极限位置的皮膜300完全由另一皮膜300的运动来单独带动中心曲柄轮101转动，使其越过极限位置，这样的传动方式使得皮膜300在极限位置的运动稳定性变差，燃气表的准确性降低， 测量精度降低。力矩为零，也即连杆102与曲柄600的转动点(图1中C点)位于摇杆103与连杆102的转动点(图1中A点或者D点)与中心曲柄轮101的转动点(图1中B点)的连线或者延长线上，连杆102的作用力沿其长度方向，不能够带动曲柄600相对于中轴转动，只能依靠另一皮膜的运动来带动其越过极限位置，增加了测量的误差，且误差最大。
因此，本实施例提供的宽量程膜式燃气表，包括微调装置，微调装置用于调整皮膜处于极限位置时阀盖的进气口相对于阀座的位置，安装模式燃气表时，通过定位装置将皮膜的极限位置准确定位，使得皮膜的安装极限位置与最佳极限位置的偏差在-0.5mm至+0.5mm内，摇杆的角度误差在-0.8°至+0.8°内，再通过调整微调装置调节皮膜处于极限位置时阀盖的进气口相对于阀座的位置，即通过微调装置能够改变极限角a的角度，从而调节计量腔室进气或者排气的时机，在皮膜达到极限位置前，完成气流方向的转换，使皮膜两侧的压力均衡，且计量腔室内的皮膜处于非张紧状态，气体流态稳定，气体压损波动小，阀盖400在皮膜未达到极限位置前就开启尚未排空的计量腔室500的进口，使得气流方向的改变先于皮膜300的转向，从而当皮膜300到达极限位置翻转前，两侧的压力已经均衡，机芯100的运动更加平稳，提高了测量精度。
位于极限位置时的皮膜在其对应的两个计量腔室内的气体的流动作用下能够带动其越过极限位置，不只是依靠另一皮膜的运动带动其越过极限位置，减少了带动皮膜越过极限位置时损失的能量，提高了测量的准确性，也提高了燃气表的测量精度。且皮膜处于极限位置时，皮膜处于非张紧状态，即整个皮膜在运动过程中，气体不会对其做功，皮膜不会消耗多余的能量，进而提高了回转体积的准确性，进入计量腔室的气体体积与计量的体积差减小，进一步提高了燃气表的准确性以及其测量精度。
该实施例的优选方案中，所述四轴联转系统还包括前旗104以及后旗105，一个所述皮膜300通过所述前旗104驱动连接于一个所述立轴106， 另一所述皮膜300通过所述后旗105驱动连接于另一所述立轴106，所述皮膜300往复直线运动令相应的所述立轴106转动，皮膜300通过前旗104或者后旗105连接相应的立轴106，再通过立轴106与摇杆103相连接，皮膜300运动，带动四轴联转系统运动，最终实现了阀盖400相对于阀座的转动。前旗104、后旗105、摇杆103以及连杆102安装时定位准确，各个部件的配合关系好，回转体积的准确性高，进而提高了燃气表的准确性。
该实施例的优选方案中，所述机芯100还包括皮膜支架107，所述皮膜300通过所述皮膜支架107安装于所述膜盒200上，皮膜300的安装方便，皮膜300安装后，其位置精度高，进而提高了整个机构的安装精度，机芯100运行时更加平稳，宽量程膜式燃气表的计量精度高。
该实施例的优选方案中，四轴联转系统中的第一转轴、第二转轴、第三转轴以及第四转轴相互平行，且垂直于中心曲柄轮所在的平面，燃气表的运行平稳，传动更加灵活。本实施例提供的燃气表，通过在安装时燃气表时提高前旗104、后旗105、摇杆103和连杆102的位置准确性，进而保证皮膜300的极限位置的准确性，在运动过程中皮膜始终处于非张紧状态，提高了回转体积的准确性，进而保证了燃气表的测量准确性。本实施例提供的燃气表的准确性高，通过微调装置在较小的范围内进行调整，调整的精度高，提供了一种准确性高、精度高的燃气表。
请参阅图3-5，该实施例的优选方案中，所述微调装置包括拨轮206以及指针本体204，所述中心曲柄轮101设置为指针盘，所述拨轮206上安装有安装轴213以及中空的凸轮轴212，所述安装轴213与所述凸轮轴212位于所述拨轮206的两侧，所述传动齿108安装于所述凸轮轴212上，且所述凸轮轴212、所述安装轴213以及所述传动轮同轴设置；所述曲柄600安装于所述指针盘上，所述指针盘上还设置有与其同轴的圆心孔216、偏心孔202以及连续的刻度槽215，所述安装轴213插装于所述圆心孔216内，所述偏心孔202的上下两端分别设置有与所述偏心孔202连通的两个凹槽 203，位于所述偏心孔202下端的所述凹槽203连通所述圆心孔216，两个所述凹槽203以所述偏心孔202的直径为界相对设置且连通，位于下端的所述凹槽203的槽底位于所述圆心孔216与所述偏心孔202之间；
所述指针本体204的针头端设置有用于卡紧在所述刻度槽215内的凸起，所述指针本体204的针尾端设置有转动轴205，所述转动轴205的外周面设置有卡接部211，所述卡接部211沿所述转动轴205的径向向外凸出，所述安装轴213的周面设置有卡接槽201，所述卡接槽201沿所述安装轴213的径向向内凹陷，所述安装轴213与所述指针盘通过所述卡接部211和所述卡接槽201轴向定位连接；所述转动轴205的下端设置有偏心销208；
所述拨轮206的轮面上设置有条形孔207，所述条形孔207的长度方向沿所述传动轮的径向方向延伸，所述偏心销208插装于所述条形孔207内。
转动指针本体204，指针本体204绕转动轴205的轴线相对于所述指针盘转动，同时，转动轴205下端的偏心销208运动，由于偏心销208位于拨轮206上的条形孔207内，拨轮206通过安装轴插装于指针盘上，凸轮轴上设置有与阀盖400插装连接的连接板，连接板位于传动轮的下方，偏心销208转动时受到条形孔207的侧壁的阻挡作用，由于拨轮206不会与偏心销208同步转动，因此偏心销208的作用力通过其自身传递给转动轴205，转动轴205的外周面与偏心孔202的内壁贴合，具有相互挤压的功能，实现了转动轴205挤压指针盘的作用，进而使得偏心销208在条形孔207内滑动带动了指针盘绕安装轴转动，曲柄600与指针盘固定连接，进而改变了曲柄600的位置，进而改变了阀盖400的位置，改变了极限角a，使得阀盖400的进气口与排气孔与计量腔室500相连通的位置改变，进而能够提高燃气表的计量精度。
请参阅图3，该实施例的优选方案中，每个所述凹槽203为半圆槽，且所述半圆槽的半径大于所述偏心孔202的半径，，相应的，卡接部211设置为半圆形，在指针本体转动时，卡接部211转动至偏心孔202下端的凹 槽203内后，指针本体204不会沿偏心孔202的轴线方向移动，指针本体204的位置不易变动，保证了燃气表的精度调整后不会改变，将凹槽203设置为半圆槽，卡接部211设置为半圆形的板，便于指针本体204的转动，配合更加紧密，调整的精度更高。
该实施例的优选方案中，所述转动轴205与所述圆心孔216的连线和所述曲柄600与所述圆心孔216的连线相交且夹角为锐角，所述指针本体204的靠近所述圆心孔216的一侧面设置为弧面214，所述弧面214朝向另一侧面凹陷，指针本体204在转动过程中，指针本体204的一侧面设置为弧面214，指针本体204朝向曲柄600转动时，曲柄600能够位于凹陷的弧面214内，指针本体204转动的范围大，能够调整的范围大，调整过程中能够得到精度更高的燃气表。
请参阅图1，该实施例的优选方案中，所述宽量程膜式燃气表还包括计数器305，所述机芯100的输出端连接所述计数器305的输入端，机芯100工作将气体充气、排气的次数通过传动机构转换为体积，进而反应在计数器305上，实现了气体的计量。
请参阅图1，该实施例的优选方案中，所述机芯100包括过渡齿301、轴向齿302、齿套303以及调节齿304，所述过渡齿301通过齿轮连接所述中心曲柄轮101，所述过渡齿301的输出端与所述轴向齿302的输入端相啮合，所述轴向齿302的输出端与所述调节齿304的输入端相啮合，所述调节齿304的输出端与所述计数器305的输入端相啮合。传动机构平稳可靠，机芯100与计数器305的连接结构简单，传动过程中误差小，计数器305上的读数更加准确。
本实施提供的皮膜300采用聚酯纱胶制成，所述阀盖400采用改性酚醛树脂注塑制成，皮膜支架107、前旗104、后旗105、摇杆103、连杆102、指示盘、指针本体、中心曲柄轮101、膜盒200均采用POM塑料注塑制成。为了提高安装精度，立轴106优选采用金属材料制成。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种宽量程膜式燃气表，其特征在于，包括机芯，所述机芯包括膜盒、两个皮膜、两个膜盖、阀座、阀盖、微调装置以及在所述两个皮膜的交替运动下，驱动所述阀盖相对于所述阀座单向转动的两组四轴联转系统，其中：
    所述阀座与所述膜盒相连接，所述阀盖与所述阀座滑动连接，所述膜盒包括两个计量室，所述两个皮膜分别位于所述两个计量室内，每个所述皮膜将对应的所述计量室分隔形成两个计量腔室；每个所述皮膜与相应的所述四轴联转系统相连接，每组所述四轴联转系统包括连杆、摇杆、立轴、中轴、曲柄以及具有传动齿的中心曲柄轮，其中，所述立轴为第一转轴，与所述摇杆的一端固定连接，所述摇杆的另一端铰接于所述连杆的一端，所述摇杆与所述连杆相连接的转动轴为第二转轴，所述连杆的另一端铰接于所述曲柄，所述曲柄的中心轴为第三转轴，所述中心曲柄轮套设在所述中轴上，所述中轴为第四转轴，所述阀盖与所述中心曲柄轮同轴设置，所述中心曲柄轮绕所述中轴转动令所述阀盖绕所述中轴同步转动；
    所述皮膜的安装极限位置与最佳极限位置的偏差在-0.5mm至+0.5mm内，所述摇杆的角度误差在-0.8°至+0.8°内，所述微调装置安装于所述中心曲柄轮，用于调整皮膜处于极限位置时所述阀盖的进气口相对于所述阀座的位置，令所述皮膜达到极限位置前完成气流方向的转换，使所述皮膜两侧的压力均衡，所述计量腔室内的皮膜处于非张紧状态，其中，所述极限位置是指所述第三转轴位于所述第四转轴和所述第二转轴所形成的平面内。
  2. 根据权利要求1所述的宽量程膜式燃气表，其特征在于，所述四轴联转系统还包括前旗以及后旗，一个所述皮膜通过所述前旗驱动连接于一个所述立轴，另一所述皮膜通过所述后旗驱动连接于另一所述立轴，所述皮膜往复直线运动令相应的所述立轴转动。
  3. 根据权利要求1所述的宽量程膜式燃气表，其特征在于，所述机芯还包括皮膜支架，所述皮膜通过所述皮膜支架安装于所述膜盒上。
  4. 根据权利要求1所述的宽量程膜式燃气表，其特征在于，所述四轴联转系统中的所述第一转轴、所述第二转轴、所述第三转轴以及所述第四转轴相互平行，且垂直于所述中心曲柄轮所在的平面。
  5. 根据权利要求4所述的宽量程膜式燃气表，其特征在于，所述微调装置包括拨轮以及指针本体，所述中心曲柄轮设置为指针盘，所述拨轮上安装有安装轴以及中空的凸轮轴，所述安装轴与所述凸轮轴位于所述拨轮所在平面的两侧，所述传动齿安装于所述凸轮轴上，且所述凸轮轴、所述安装轴以及所述传动轮同轴设置；所述曲柄安装于所述指针盘上，所述指针盘上还设置有与其同轴的圆心孔、偏心孔以及连续的刻度槽，所述安装轴插装于所述圆心孔内，所述偏心孔的上下两端分别设置有与所述偏心孔连通的两个凹槽，位于所述偏心孔下端的所述凹槽连通所述圆心孔，两个所述凹槽以所述偏心孔的直径为界相对设置且连通，位于下端的所述凹槽的槽底位于所述圆心孔与所述偏心孔之间；
    所述指针本体的针头端设置有用于卡紧在所述刻度槽内的凸起，所述指针本体的针尾端设置有转动轴，所述转动轴的外周面设置有卡接部，所述卡接部沿所述转动轴的径向向外凸出，所述安装轴的周面设置有卡接槽， 所述卡接槽沿所述安装轴的径向向内凹陷，所述安装轴与所述指针盘通过所述卡接部和所述卡接槽轴向定位连接；所述转动轴的下端设置有偏心销；
    所述拨轮的轮面上设置有条形孔，所述条形孔的长度方向沿所述传动轮的径向方向延伸，所述偏心销插装于所述条形孔内。
  6. 根据权利要求5所述的宽量程膜式燃气表，其特征在于，每个所述凹槽为半圆槽，且所述半圆槽的半径大于所述偏心孔的半径，相应的，所述卡接部设置为半圆形。
  7. 根据权利要求6所述的宽量程膜式燃气表，其特征在于，所述转动轴与所述圆心孔的连线和所述曲柄与所述圆心孔的连线相交且夹角为锐角，所述指针本体的靠近所述圆心孔的一侧面设置为弧面，所述弧面朝向另一侧面凹陷。
  8. 根据权利要求1所述的宽量程膜式燃气表，其特征在于，每个所述立轴采用金属材料制成。
  9. 根据权利要求1所述的宽量程膜式燃气表，其特征在于，所述宽量程膜式燃气表还包括计数器，所述机芯的输出端连接所述计数器的输入端。
  10. 根据权利要求9所述的宽量程膜式燃气表，其特征在于，所述机芯包括过渡齿、轴向齿、齿套以及调节齿，所述过渡齿通过齿轮连接所述传动轮，所述过渡齿的输出端与所述轴向齿的输入端相啮合，所述轴向齿的输出端与所述调节齿的输入端相啮合，所述调节齿的输出端与所述计数器的输入端相啮合。
PCT/CN2016/103552 2016-05-17 2016-10-27 宽量程膜式燃气表 WO2017197839A1 (zh)

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EP16902218.3A EP3460418B1 (en) 2016-05-17 2016-10-27 Wide-range diaphragm gas meter
ES16902218T ES2882036T3 (es) 2016-05-17 2016-10-27 Medidor de gas de diafragma de amplio intervalo
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CN106932042A (zh) * 2017-04-27 2017-07-07 德力西集团仪器仪表有限公司 一种燃气表机芯及具有该机芯的铝壳燃气表和铁壳燃气表
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