CN112067087B - Gas flow standard device capable of adjusting centering of sonic nozzle - Google Patents
Gas flow standard device capable of adjusting centering of sonic nozzle Download PDFInfo
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- CN112067087B CN112067087B CN202010814680.6A CN202010814680A CN112067087B CN 112067087 B CN112067087 B CN 112067087B CN 202010814680 A CN202010814680 A CN 202010814680A CN 112067087 B CN112067087 B CN 112067087B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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Abstract
The invention discloses a gas flow standard device capable of adjusting the centering of a sonic nozzle, which comprises a gas unit, a gas unit and a gas outlet unit, wherein the gas unit comprises a standard container and a temperature constant guarantee assembly positioned on the periphery of the standard container; the calibration unit comprises a second switch valve connected between the air inlet unit and the air inlet, a temperature measuring part connected with the standard container and a pressure measuring part connected with the standard container, wherein the second switch valve is connected with a photoelectric signal converter, and the photoelectric signal converter is connected with a timer; the temperature measuring part, the pressure measuring part and the timer are all connected with the controller; the device has the advantages of simple, reasonable and effective mechanism, large detection range and high accuracy, and the sonic nozzle can be accurately positioned and fixed at the central position of the flange of the connecting pipeline through simple operation.
Description
Technical Field
The invention relates to a gas flow standard device, in particular to a gas flow standard device capable of adjusting the centering of a sonic nozzle.
Background
In order to effectively carry out the detection work of the gas energy instrument, the construction of the gas flow standard device in China enters a high-speed development period, but the quality of the standard device is uneven due to the difference of the technical levels of production enterprises, and meanwhile, the problem of inspection delivery of the standard device is increasingly prominent. The method combines the current situation of quantity value traceability of the gas flow instrument in China and can meet the situation that the traceability of a gas flow standard device is effectively and quickly carried out by a plurality of industries, the research flow range is wide, the accuracy is high, and the method has the advantages ofThe pVTt method gas flow standard device has the advantages that two detection working conditions of positive pressure and negative pressure are adopted, and the quantity transmission of the sonic nozzle and the high-grade standard meter is realized. At present, the unit of the multipurpose pVTt method gas flow standard device in China works under normal pressure and micro-positive pressure, and the maximum verification flow only reaches 1300m3And/h, the actual demand cannot be met. And a 0.2-level high-precision standard gas flowmeter is widely used in gas standard devices, but a scientific and legal standard device is not used for providing effective traceability, and the precision is not high and the efficiency is low. On the other hand, when the sonic nozzle is mounted, it is usually placed at the center of the flange only by the naked eye, and it is easily shifted, resulting in unnecessary error data.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.
Therefore, the technical problem to be solved by the invention is that the 0.2-level high-precision standard gas flowmeter is widely used in gas standards, but the standard device which is scientifically legal is not used for providing effective traceability, and the precision is not high and the efficiency is low. On the other hand, when the sonic nozzle is mounted, it is usually placed at the center of the flange only by the naked eye, and it is easily shifted, resulting in unnecessary error data.
In order to solve the technical problems, the invention provides the following technical scheme: a gas flow standard device capable of adjusting the centering of a sonic nozzle comprises a gas unit, a gas inlet unit, a gas outlet unit and a gas flow standard device, wherein the gas unit comprises a standard container and a temperature constant guarantee assembly positioned on the periphery of the standard container; the calibration unit comprises a second switch valve connected between the air inlet unit and the air inlet, a temperature measuring part connected with the standard container, and a pressure measuring part connected with the standard container, wherein the second switch valve is connected with a photoelectric signal converter, and the photoelectric signal converter is connected with a timer; the temperature measuring part, the pressure measuring part and the timer are all connected with the controller.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: the air inlet unit comprises a connecting assembly connected with an inlet of the second switch valve and a centering assembly; the connecting assembly comprises a first flange, a second flange and a connecting pipe, the first flange is connected with an inlet of the second switch valve, third flanges are arranged at two ends of the connecting pipe respectively, and the two third flanges are connected with the first flange and the second flange respectively; the centering assembly is positioned in the connecting pipe and comprises a centering disc connected with the first flange and a centering base connected with the centering disc; and a sonic nozzle mounted on the centering base.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: the centering plate with first flange bolted connection, the centering base evenly is provided with at least three adjustment tank along the circumference, be provided with the hinge hole in the adjustment tank, the hinge hole articulates there is the clamping piece, the clamping piece passes through the bolt and articulates with the hinge hole, clamping piece one end with the lateral contact of sonic nozzle.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: centering base inner wall is provided with places the boss, place boss centre of a circle department and form first through-hole, the sonic nozzle is installed place on the boss, centering assembly still includes the sealing member, the sealing member is the cavity pipeline, sealing member one end along radially outwards extending form sealed dish and with centering dish connects, the embedding of the sealing member other end is in the first through-hole, the inside second through-hole that forms of sealing member.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: the centering assembly further comprises a moving ring, the moving ring is located in a gap between the sealing piece and the centering base and between the placing boss and the sealing disc, and the moving ring is connected with the clamping piece.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: a notch is formed in the outer side surface of the moving ring along the circumference, the clamping piece is divided into a first end and a second end, the first end is located in the notch, and the second end is in contact with the side surface of the sonic nozzle; the cross section profile of first end is located the cross section profile of notch is interior, the notch is followed the carriage release ring axial extension divides into first spacing end and the spacing end of second, first end is in move about between first spacing end and the spacing end of second.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: the outer side surface of the moving ring is radially provided with a connecting hole, the connecting hole is connected with a fastening pin, one end of the fastening pin is inserted into the connecting hole, and the other end of the fastening pin penetrates through the adjusting groove and extends out of the centering base; the centering assembly further comprises a fastening ring, the fastening ring is provided with an internal thread, an external thread is arranged on the outer circumference of the centering base, the centering base is in threaded connection with the fastening ring, and one end, close to the centering disc, of the fastening ring is abutted to the fastening pin.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: the centering assembly further comprises an elastic piece, the elastic piece is located in a gap between the sealing piece and the centering base, one end of the elastic piece is connected with the sealing disc, and the other end of the elastic piece is connected with the moving ring.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: the centering assembly further comprises a pressing flange, the pressing flange is connected with the centering disc through a bolt, and one end face of the pressing flange is in contact with the sonic nozzle.
As a preferable aspect of the gas flow rate standard device in the adjustable sonic nozzle pair according to the present invention, wherein: the constant temperature guaranteeing assembly is a constant temperature water bath jacket, the temperature measuring piece is a temperature sensor, and the pressure measuring piece is a pressure sensor.
The invention has the beneficial effects that: the device has the advantages of simple, reasonable and effective mechanism, large detection range, high accuracy, maintenance of the measurement accuracy of the pVTt method device and great reduction of the verification time; through simple operation for the sound velocity nozzle can be accurate be in the central point of connecting tube flange and fix, has improved the experiment accuracy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic structural diagram of a gas flow calibration apparatus in an adjustable sonic nozzle pair according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an adjustable sonic nozzle centering air inlet unit according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a centering assembly of a gas flow calibration device in an adjustable sonic nozzle pair according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a centering process in a gas flow calibration apparatus of an adjustable sonic nozzle pair according to an embodiment of the present invention;
fig. 5 is an exploded view of an air inlet unit of a gas flow standard device in an adjustable sonic nozzle pair according to an embodiment of the present invention;
FIG. 6 is a partial enlarged view of a centering assembly of the gas flow calibration device of the adjustable sonic nozzle pair according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a centering assembly in a gas flow calibration device of an adjustable sonic nozzle pair according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1, the present embodiment provides a gas flow calibration apparatus for an adjustable sonic nozzle pair, including a gas unit 100 and a verification unit 200, where the gas unit 100 includes a standard container 101 and a temperature constant guarantee assembly 102 located at the periphery of the standard container 101, the standard container 101 includes a gas inlet 101a and a gas outlet 101b, the gas inlet 101a is connected to a gas inlet unit a, the gas outlet 101b is connected to a first switch valve 103, and the first switch valve 103 is connected to a vacuum pump 104; the standard container 101 adopts the existing integral skid-mounted structure, and the skid-mounted structure is an integration mode that functional components are integrated on an integral base and can be integrally installed and moved; the skid-mounting is conveniently carried out by moving equipment, positioning and using a skid bar, and comprises a verification bench correspondingly mounted with a standard container 101, wherein the standard container 101 is provided with a constant temperature guarantee assembly 102, the water jacket type constant temperature setting in the prior art is adopted in the embodiment and used for controlling the temperature around the standard container 101, an air inlet 101a is used for air inlet, an air outlet 101b is used for air exhaust, an air inlet unit A is provided with a sonic nozzle to be detected, and a vacuum pump 104 forms a negative pressure state by pumping air in the standard container 101 and then feeds air from the sonic nozzle.
Further, the verification unit 200 includes a second switch valve 201 connected between the air inlet unit a and the air inlet 101a, a temperature measuring member 202 connected to the standard container 101, and a pressure measuring member 203 connected to the standard container 101, the second switch valve 201 is connected to a photoelectric signal converter 206, the photoelectric signal converter 206 is connected to a timer 205, wherein the temperature measuring member 202 is a temperature sensor and is distributed inside the standard container 101, the pressure measuring member 203 is a pressure sensor, and the photoelectric signal converter 206 transmits data of the second switch valve 201 to the timer 205. The temperature measuring part 202, the pressure measuring part 205 and the timer 203 are all connected with the controller 204, the controller 204 is a computer for processing information, a prediction model of temperature difference, pressure and temperature is established by adopting big data processing on the temperature difference between the average temperature of gas in the tank body and the water bath temperature measured five minutes after air inlet and the pressure data in the tank body, and the detection mass flow of the device can be calculated by predicting the values of the pressure and the temperature in the tank body in a steady state and utilizing a relevant formula.
The implementation manner of the embodiment is as follows: before the calibration is started, the standard container 101 is selected according to the flow rate, the first on-off valve 103 is opened, the standard container 101 is evacuated by the vacuum pump 104, and the first on-off valve 103 is closed. According to the temperature and the pressure of the standard container 101 measured by the sensor in vacuum, the temperature constant guaranteeing assembly 102 adjusts the temperature in the standard container 101 to be stable, and measures the temperature and the pressure of the gas in the standard container 101 after the temperature of the gas in the standard container 101 is stable.
The second on-off valve 201 is opened and the timer 205 is started. The atmospheric air passes through the air intake unit a, the second on-off valve 201, and the air continues to flow into the standard container 101 at a constant flow rate. After the standard container 101 is full, the second on-off valve 201 is closed, and the timer 205 is stopped. And at the same time, the temperature in the standard container 100 is regulated and stabilized again by using the constant temperature guarantee assembly 102, and the temperature and the pressure of the gas in the standard container 101 are measured after the temperature of the gas in the standard container 100 is stabilized. The theoretical mass flow through the inlet unit a, i.e. the sonic nozzle, can be measured. Specifically, a model prediction is adopted to establish a prediction model of temperature difference, pressure and temperature for the temperature difference between the average temperature of the gas in the tank body and the water bath temperature and the pressure data in the tank body which are measured five minutes after air inlet, the verification medium adopted in the embodiment of the invention is nitrogen, and the rapid verification is specifically carried out by adopting the following method:
s1, obtaining the equilibrium state parameter before air inlet, the gas parameter in the tank five minutes after air inlet and the water bath temperature in the standard container 101;
s2, establishing a prediction model by big data processing according to the temperature difference (T-Tw) between the average temperature of the gas in the tank body and the temperature of the water bath:
in the formula (I), the compound is shown in the specification,
lambda is more than or equal to 0 and is a harmonic function;
and S3, adopting a prediction model to bring the experimental measurement values of the previous 5 minutes into and predict a final P, T value, and calculating the detection mass flow of the device by using the following formula:
in the formula: vNStandard volume of standard container, m3；
TN-standard state temperature, 293.15K;
ZNin the Standard State (T)N，ρN) Lower, compressibility of nitrogen, ZN＝0.99978；
alpha-coefficient of linear expansion of standard container material, 1.66 x 10-5(at 20 ℃);
t is the average temperature of the gas in the standard container during calibration, K;
ZE，ZF-the compressibility of the nitrogen in the standard vessel before and after filling with nitrogen;
Δ t — time system difference due to switching valve, s;
Δ m-additional mass, kg.
S4: finally, the relative error between the mass flow rate calculated by the method and the traditional test result is 0.0086%, and the calculation results of 10 groups of experimental data are recorded as shown in table 1:
TABLE 1
The average relative error can be calculated to be 0.0097%, so that the rapid verification method of the gas flow standard device provided by the invention can obtain an accurate verification result of the error within 1/12 time of the original verification time, and greatly improve the verification efficiency of the gas flow verification device of the pVTt method.
Example 2
Referring to fig. 1 to 3, a second embodiment of the present invention is based on the previous embodiment, and is different from the previous embodiment in that: the present embodiment performs centering operation for mounting the sonic nozzle 300, and the air inlet unit a includes a connection assembly 300 connected to an inlet of the second switching valve 201, and a centering assembly 400; specifically, the connecting assembly 300 includes a first flange 301, a second flange 302, and a connecting pipe 303, the first flange 301 is communicated with the standard container, the second flange 302 is connected with the air inlet end, in this embodiment, because the centering assembly 400 is added, the connecting pipe 303 is required to be connected and ventilated, the two ends of the connecting pipe 303 are respectively provided with a third flange 303a, and the two third flanges 303a are respectively connected with the first flange 301 and the second flange 302, so as to achieve a sealing effect; the centering assembly 400 is positioned in the connecting pipe 303 and comprises a centering disc 401 connected with the first flange 301 and a centering base 402 connected with the centering disc 401, the centering disc 401 is connected with the first flange 301 in a bolt connection mode, the centering disc 401 is also a disc-shaped flange, the centering base 402 is connected with the centering disc 401 in a welding mode, and the centering base 402 is a hollow cylinder; and, a sonic nozzle 500, the sonic nozzle 500 mounted on the centering base 402; the sonic nozzle 500 is a gradually reducing and gradually releasing channel, when the air flow passes through the gradually reducing section, the speed is increased, the pressure is reduced, the sonic speed formed at the minimum section reaches the critical air flow, and then the velocity kinetic energy is converted into the pressure energy through the gradually expanding section, so that the pressure is recovered.
Further, the centering plate 401 is bolted to the first flange 301 and is sealed, at least three adjusting grooves 402a are uniformly formed in the centering base 402 along the circumference, preferably 3 in this embodiment, since in centering, three points can determine a circle, a hinge hole 402b is formed in the adjusting groove 402a, the hinge hole 402b is hinged to a clamping member 403, the clamping member 403 is hinged to the hinge hole 402b through bolts, so that the clamping member 403 can rotate around the hinge hole 402b, when the three clamping members 403 rotate simultaneously, the size of the circle which can be determined at one end of each clamping member 403 changes accordingly, one end of each clamping member 403 contacts with the side surface of the sonic nozzle 500, and when the end of each clamping member contacting with the side surface of the sonic nozzle 500 is gradually contracted, the three clamping members 403 interact to center and center the sonic nozzle 403.
The centering process of this embodiment is: first, the first flange 301 and the second flange 302 are separated, the centering disc 401 is fixed on the first flange 301, then the sonic nozzle 500 to be centered is placed on the centering base 402, the rotation of the clamping pieces 403 is adjusted, one end of each clamping piece 403 is enabled to be abutted against the sonic nozzle 500, the position of the sonic nozzle 500 is fixed, centering is completed, and then the connecting pipe 303 and the second flange 302 are sequentially installed.
Example 3
Referring to fig. 1 to 7, a third embodiment of the present invention is based on the previous embodiment, and is different from the previous embodiment in that:
a placing boss 402c is arranged on the inner wall of the centering base 402, the inner diameter of the placing boss 402c is smaller than that of the placing boss 402c, and the sonic nozzle 500 is arranged on the placing boss 402c and plays a role in placing the sonic nozzle 500; a first through hole 402d is formed at the circle center of the placing boss 402c, and the first through hole 402d achieves the ventilation effect; the centering assembly 400 further comprises a sealing element 404, the sealing element 404 is a hollow pipeline, one end of the sealing element 404 extends outwards in the radial direction to form a sealing disc 404a and is connected with the centering disc 401, the connection mode is that fastening bolts are selected for connection and sealing processing is carried out, the other end of the sealing element 404 is embedded into the first through hole 402d and is sealed, the second through hole 404b formed inside the sealing element 404 is communicated with the first through hole 402d, and the effects of sealing and ventilating are achieved.
Further, the centering assembly 400 further comprises a moving ring 405, the moving ring 405 is annular, the moving ring 405 is located in a gap between the sealing member 404 and the centering base 402 and located between the placing boss 402c and the sealing disc 404a, namely, the moving ring is sleeved outside the sealing member 404 and can move along the axial direction, the moving ring 405 is connected with the clamping member 403 in a movable connection mode, when the moving ring 405 starts to move, one end of the clamping member 403 connected with the moving ring 405 moves along with the moving ring, and because the clamping member 403 is hinged on the centering base 402, one end of the clamping member in contact with the sonic nozzle 500 rotates, and therefore the effect of tightening or loosening is achieved.
Further, a notch 405a is circumferentially formed on the outer side surface of the moving ring 405, the clamping member 403 is divided into a first end 403a and a second end 403b, the first end 403a is located in the notch 405a, and the second end 403b is in contact with the side surface of the sonic nozzle 500; when the moving ring 405 moves in the axial direction, the first end 403a moves in the notch 405a, so that the clamp 403 can rotate around the hinge hole 402 b. The cross-sectional profile of the first end 403a is within the cross-sectional profile of the notch 405a, and the cross-section of the first end 403a is smaller than the cross-sectional profile of the notch 405a, i.e., the first end 403a is movable within the notch 405 a.
Specifically, the notch 405a is divided into a first limiting end 405a-1 and a second limiting end 405a-2 along the axial extension of the moving ring 405, the first end 403a moves between the first limiting end 405a-1 and the second limiting end 405a-2, when the moving ring 405 moves towards the direction of the sealing disc 404a, the first limiting end 405a-1 contacts with the first end 403a, and the first end 403a moves towards the direction of the sealing disc 404a, so that the second end 403b moves towards the center of the placing boss 402c in the rotating process of the clamping member 403, that is, the second ends 403b of the three clamping members 403 are in a tightened state, and the centering of the sonic nozzle 500 can be performed; and vice versa. When the moving ring 405 moves toward the original sealing disk 404a, the second stopper 405a-2 contacts the first end 403a, and the first end 403a moves away from the sealing disk 404a, and the second end 403b moves away from the center of the placing boss 402c, that is, the distance between circles defined by the second ends 403b of the three clamping members 403 becomes larger, and the sonic nozzle 500 can be taken down.
Furthermore, the outer side of the moving ring 405 is provided with a connecting hole 405b along the radial direction, the connecting hole 405b is connected with a fastening pin 406, one end of the fastening pin 406 is inserted into the connecting hole 405b, and the other end of the fastening pin 406 passes through the adjusting groove 402a and extends out of the centering base 402, so that the effect of adjusting the position of the moving ring 405 can be achieved according to the position of the fastening pin 406, and when the fastening pin 406 is pulled, the moving ring 405 can be adjusted, and then the state of the clamping member 403 can be adjusted.
Further, for the convenience of adjustment, the centering assembly 400 further includes a fastening ring 407, the fastening ring 407 is provided with an internal thread 407a, the outer circumference of the centering base 402 is provided with an external thread 402e, the fastening ring 407 is threadedly coupled with the centering base 402, and one end of the fastening ring 407 adjacent to the centering plate 401 abuts against the fastening pin 406, so that the state of the clamping member 403 can be adjusted when the positional relationship between the fastening ring 407 and the centering base 402 is adjusted.
Further, the centering assembly 400 further includes an elastic member 408, the elastic member 408 is a spring, the elastic member 408 is located in a gap between the sealing member 404 and the centering base 402, one end of the elastic member 408 is connected to the sealing disc 404a, and the other end is connected to the moving ring 405, the elastic force of the elastic member 408 enables the moving ring 405 to be located away from the sealing disc 404a, that is, the clamping member 403 is in an initial state of a released state, and the sonic nozzle 500 can be placed into the clamping member 403 for centering.
Preferably, the centering assembly 400 further includes a pressing flange 409, the pressing flange 409 is in bolted connection with the centering disk 401, and an end face of the pressing flange 409 contacts with the sonic nozzle 500, so as to achieve better positioning and fixing effects on the sonic nozzle 500.
The process of centering and positioning the sonic nozzle 500 in this embodiment is as follows: in the initial state, the sonic nozzle 500 is not yet installed, the elastic force of the elastic member 408 causes the moving ring 405 to be located away from the sealing disc 404a, at this time, the first end 403a of the clamping member 403 is located in the notch 405a and contacts with the second limit end 405a-2, i.e. the first end 403a is located close to the axial center of the placing boss 402c, the second end 403b is located away from the axial center of the placing boss 402c, the diameter of the inscribed circle formed by the second end 403b of the three uniformly distributed clamping members 403 is the largest, and the center of the inscribed circle is always fixed, at this time, the sonic nozzle 500 is placed on the placing boss 402c, the center of the placing position cannot be accurately determined, so that the fastening ring 407 is moved toward 404a by rotating the fastening ring 407, the fastening ring 407 pushes the fastening pin 406 to move toward the sealing disc 404a, and the fastening pin 406 carries the moving ring 405 to move toward the sealing disc 404a, the notch 405a moves toward the sealing disk 404a, the first end 403a is disengaged from the second stopper 405a-2 and then contacts the first stopper 405a-1, and the clamping member 403 is rotated about the hinge hole 402b by the pushing action of the first stopper 405a-1, so that the second end 403b of the clamping member 403 starts to move toward the axial center of the placement boss 402c, and the three second ends 403b contact and center the side of the sonic nozzle 500 until the three second ends 403b tightly abut against the sonic nozzle 500, and the rotation of the fastening ring 407 is stopped and fixed at this position, thereby completing the centering and centering operation of the sonic nozzle 500; when the sonic nozzle 500 is disassembled, contrary to the above operation, the fastening ring 407 is rotated in the opposite direction to move the moving ring 405 toward the placing boss 402c, the first end 403a is separated from the first limiting end 405a-1 and contacts with the second limiting end 405a-2, and is rotated by the pushing of the second limiting end 405a-2, so that the second end 403b moves away from the center of the placing boss 402c, and the clamping member 403 presses the sonic nozzle 500 to be reduced, so that the sonic nozzle 500 can be disassembled.
According to the invention, the centering assembly 400 is arranged between the two flanges, when the gas flow standard device is operated, the sonic nozzle 500 to be verified needs to be installed, but in the prior art, the operation is only manual, and the sonic nozzle 500 is placed at the central position by visual observation, so that the deviation is easily caused.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. The utility model provides a gas flow standard device in adjustable sound velocity nozzle centering which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the gas unit (100) comprises a standard container (101) and a constant temperature guarantee assembly (102) positioned on the periphery of the standard container (101), wherein the standard container (101) comprises a gas inlet (101a) and a gas outlet (101b), the gas inlet (101a) is connected with a gas inlet unit (A), the gas outlet (101b) is connected with a first switch valve (103), and the first switch valve (103) is connected with a vacuum pump (104);
the verification unit (200) comprises a second switch valve (201) connected between the air inlet unit (A) and the air inlet (101a), a temperature measuring piece (202) connected with the standard container (101), and a pressure measuring piece (203) connected with the standard container (101), wherein the second switch valve (201) is connected with a photoelectric signal converter (206), and the photoelectric signal converter (206) is connected with a timer (205);
the temperature measuring piece (202), the pressure measuring piece (205) and the timer (203) are all connected with the controller (204);
the air intake unit (A) comprises a connecting assembly (300) connected with the inlet of the second switch valve (201), and a centering assembly (400);
the connecting assembly (300) comprises a first flange (301), a second flange (302) and a connecting pipe (303), the first flange (301) is connected with an inlet of the second switch valve (201), third flanges (303a) are respectively arranged at two ends of the connecting pipe (303), and the two third flanges (303a) are respectively connected with the first flange (301) and the second flange (302);
a centering assembly (400), said centering assembly (400) being located within said connecting tube (303), comprising a centering disk (401) connected to said first flange (301), a centering base (402) connected to said centering disk (401); and the number of the first and second groups,
the centering assembly (400) further comprises a sonic nozzle (500), the sonic nozzle (500) being mounted on the centering base (402);
the centering plate (401) is connected with the first flange (301) through bolts, at least three adjusting grooves (402a) are uniformly formed in the centering base (402) along the circumference, hinge holes (402b) are formed in the adjusting grooves (402a), clamping pieces (403) are hinged to the hinge holes (402b), the clamping pieces (403) are hinged to the hinge holes (402b) through bolts, and one end of each clamping piece (403) is in contact with the side face of the sonic nozzle (500).
2. The gas flow calibration device in an adjustable sonic nozzle pair of claim 1, wherein: centering base (402) inner wall is provided with places boss (402c), it forms first through-hole (402d) to place boss (402c) centre of a circle department, sonic nozzle (500) are installed place on boss (402c), centering subassembly (400) still include sealing member (404), sealing member (404) are the cavity pipeline, and sealing member (404) one end radially outwards extends and forms sealed dish (404a) and with centering dish (401) are connected, sealing member (404) other end embedding is in first through-hole (402d), sealing member (404) inside second through-hole (404b) that forms.
3. The gas flow calibration device in an adjustable sonic nozzle pair of claim 2, wherein: the centering assembly (400) further comprises a shifting ring (405), the shifting ring (405) being located in the gap between the sealing member (404) and the centering base (402) and between the placing boss (402c) and the sealing disk (404a), the shifting ring (405) being connected with the clamping member (403).
4. The gas flow calibration device in an adjustable sonic nozzle pair of claim 3, wherein: a notch (405a) is formed in the outer side surface of the moving ring (405) along the circumference, the clamping piece (403) is divided into a first end (403a) and a second end (403b), the first end (403a) is located in the notch (405a), and the second end (403b) is in contact with the side surface of the sonic nozzle (500);
the cross-sectional profile of the first end (403a) is located in the cross-sectional profile of the notch (405a), the notch (405a) is divided into a first limiting end (405a-1) and a second limiting end (405a-2) along the axial extension of the moving ring (405), and the first end (403a) moves between the first limiting end (405a-1) and the second limiting end (405 a-2).
5. The gas flow calibration device in an adjustable sonic nozzle pair of claim 4, wherein: a connecting hole (405b) is formed in the outer side surface of the moving ring (405) along the radial direction, a fastening pin (406) is connected to the connecting hole (405b), one end of the fastening pin (406) is inserted into the connecting hole (405b), and the other end of the fastening pin (406) penetrates through an adjusting groove (402a) and extends out of the centering base (402);
the centering assembly (400) further comprises a fastening ring (407), wherein an internal thread (407a) is arranged on the fastening ring (407), an external thread (402e) is arranged on the outer circumference of the centering base (402), the centering base (402) is in threaded connection with the fastening ring (407), and one end, close to the centering disc (401), of the fastening ring (407) abuts against the fastening pin (406).
6. The gas flow calibration device in an adjustable sonic nozzle pair of claim 5, wherein: the centering assembly (400) further comprises an elastic piece (408), the elastic piece (408) is located in a gap between the sealing piece (404) and the centering base (402), one end of the elastic piece (408) is connected with the sealing disc (404a), and the other end of the elastic piece (408) is connected with the moving ring (405).
7. The gas flow calibration device in an adjustable sonic nozzle pair of claim 6, wherein: the centering assembly (400) further comprises a pressing flange (409), the pressing flange (409) is in bolt connection with the centering disc (401), and one end face of the pressing flange (409) is in contact with the sonic nozzle (500).
8. The gas flow calibration device of an adjustable sonic nozzle pair as claimed in any one of claims 1 to 7, wherein: the constant temperature guaranteeing assembly (102) is a constant temperature water bath jacket, the temperature measuring piece (202) is a temperature sensor, and the pressure measuring piece (203) is a pressure sensor.
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| CN202010814680.6A CN112067087B (en) | 2020-08-13 | 2020-08-13 | Gas flow standard device capable of adjusting centering of sonic nozzle |
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| CN202010814680.6A CN112067087B (en) | 2020-08-13 | 2020-08-13 | Gas flow standard device capable of adjusting centering of sonic nozzle |
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| CN112067087B true CN112067087B (en) | 2021-04-13 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4645174A (en) * | 1985-05-16 | 1987-02-24 | American Meter Company | Mounting arrangement for a critical flow device |
| CN103900665A (en) * | 2014-03-25 | 2014-07-02 | 重庆市计量质量检测研究院 | Container combination and reversing valve type pVTt-method gas flow device |
| CN105928592A (en) * | 2016-04-27 | 2016-09-07 | 中国计量大学 | Rapid detection pVTt methodgas flow standard device and detection method |
| CN109506744A (en) * | 2018-12-10 | 2019-03-22 | 中国航发四川燃气涡轮研究院 | A kind of aero-engine overall test Venturi nozzle air mass flow calibration method |
| CN209181843U (en) * | 2018-11-19 | 2019-07-30 | 天津江泰仪表有限公司 | A kind of Venturi nozzle experimental provision |
| CN210036908U (en) * | 2019-07-17 | 2020-02-07 | 中国石油化工股份有限公司天然气分公司计量研究中心 | High-pressure natural gas flow primary standard device with adjustable sonic nozzle |
| CN210774278U (en) * | 2019-12-05 | 2020-06-16 | 镇江市计量检定测试中心 | pVTt method gas flow standard device |
-
2020
- 2020-08-13 CN CN202010814680.6A patent/CN112067087B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4645174A (en) * | 1985-05-16 | 1987-02-24 | American Meter Company | Mounting arrangement for a critical flow device |
| CN103900665A (en) * | 2014-03-25 | 2014-07-02 | 重庆市计量质量检测研究院 | Container combination and reversing valve type pVTt-method gas flow device |
| CN105928592A (en) * | 2016-04-27 | 2016-09-07 | 中国计量大学 | Rapid detection pVTt methodgas flow standard device and detection method |
| CN209181843U (en) * | 2018-11-19 | 2019-07-30 | 天津江泰仪表有限公司 | A kind of Venturi nozzle experimental provision |
| CN109506744A (en) * | 2018-12-10 | 2019-03-22 | 中国航发四川燃气涡轮研究院 | A kind of aero-engine overall test Venturi nozzle air mass flow calibration method |
| CN210036908U (en) * | 2019-07-17 | 2020-02-07 | 中国石油化工股份有限公司天然气分公司计量研究中心 | High-pressure natural gas flow primary standard device with adjustable sonic nozzle |
| CN210774278U (en) * | 2019-12-05 | 2020-06-16 | 镇江市计量检定测试中心 | pVTt method gas flow standard device |
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| CN112067087A (en) | 2020-12-11 |
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