JP6471010B2 - Nozzle and flow meter calibration device - Google Patents

Description

  The present invention relates to a nozzle provided in a flowmeter calibration device. The present invention also relates to a flowmeter calibration apparatus equipped with the nozzle.

  Patent Document 1 discloses this type of flowmeter calibration device. A diverter is provided in order to calibrate the flow meter for measuring the flow rate of the liquid flowing through the pipe line with high accuracy. The diverter is a device that switches the destination of the liquid flowing out from the nozzle that is the outlet of the pipe line between the weighing unit and the discharge unit. It is determined whether the weight of the liquid measured by the weighing unit corresponds to the flow rate of the liquid measured by the flow meter. Based on the determination result, the flow meter is calibrated as necessary.

  The flow rate of the liquid flowing through the pipe line is defined as the volume of the liquid flowing through the pipe line within a unit time. Therefore, the diverter directs the liquid flowing out of the nozzle for the unit time to the weighing unit. After the elapse of the unit time, the diverter directs the liquid flowing out from the nozzle toward the discharge portion.

JP 2002-048622 A

  The operation of the diverter that directs the liquid flowing out from the nozzle to the weighing unit for a unit time is based on the premise that the liquid flowing out from the nozzle is in a rectified state. In the present specification, the term “rectifying state” means a state in which the state of the flux is continuously maintained (the same state as the liquid passing through the flowmeter in the pipe). The term “flux” refers to the shape of the liquid flow exiting the nozzle.

  For example, when a relatively small amount of liquid is allowed to flow out from a nozzle having a relatively large diameter, air may enter the pipe and the rectification state may be broken. Specifically, the flux becomes discontinuous or the width of the flux changes. In this case, an appropriate amount of liquid cannot be directed to the weighing section within the unit time. As a result, an error occurs in the weighing result, and the calibration of the flow meter cannot be performed accurately.

  Therefore, an object of the present invention is to enable accurate calibration of a flow meter.

In order to achieve the above object, a first aspect that the present invention can take is a nozzle provided in a flowmeter calibration apparatus,
A first conduit capable of flowing a first flow rate of liquid;
A second conduit having an outlet disposed in the first conduit and capable of flowing a liquid having a second flow rate less than the first flow rate;
A first valve capable of opening and closing the first conduit;
A second valve capable of opening and closing the second pipe line;
It has.

  The breaking of the rectification state described above is caused by a mismatch between the flow rate of the liquid flowing out from the nozzle and the diameter of the nozzle. That is, even when the flow rate is small, if the nozzle diameter matches the width of the flux corresponding to the flow rate, breakage of the rectification state due to air intrusion or the like can be avoided. However, since the calibration of the flowmeter is performed based on a plurality of types of flow rates, the nozzle diameter is generally determined so as to cope with a larger flow rate. Therefore, the rectification state is likely to be broken during measurement at a smaller flow rate.

  On the other hand, it is conceivable to provide a plurality of nozzles having a diameter corresponding to a plurality of types of flow rates. However, a space for arranging a plurality of nozzles side by side and a space for arranging a plurality of diverters for receiving liquid flowing out from the plurality of nozzles one-on-one (or a space for arranging a large diverter that can be opposed to all the nozzles) are required. Therefore, an increase in the size of the flowmeter calibration device is inevitable.

  Therefore, the inventors can solve the above-mentioned problem by arranging the outlet of the pipeline that can flow a smaller flow rate of liquid in the pipeline that can flow a larger flow rate of liquid. I found out.

  According to said structure, the exit part of the 2nd pipe line which can flow the liquid of 2nd flow volume is in the 1st pipe line which can flow the liquid of 1st flow volume larger than 2nd flow volume. Has been placed. Opening and closing of the first pipeline and the second pipeline can be controlled by the first valve and the second valve, respectively.

  The flow rate of the liquid flowing out from the nozzle can be adjusted in three stages according to the opening and closing of the first valve and the second valve. Since the first and second pipes are configured to allow two types of flow (first flow and second flow) to flow in three ways, it flows out of each pipe. The rectifying state of the liquid to be maintained can be maintained. In any of the three possible flow rates, the liquid flux flowing out from the nozzle can be within the diameter of the first conduit. In other words, it is possible to cause a plurality of types of liquids with flow rates maintained in a rectified state to flow out of the nozzle while suppressing an increase in the size of the flowmeter calibration device. In addition, since it is possible to avoid an increase in the size of the diverter, it is possible to suppress a decrease in the operation accuracy of the diverter. Therefore, the accuracy of the liquid weight measurement in the weighing unit where the liquid flows in through the diverter is improved, and the calibration of the flow meter can be executed accurately.

The nozzle can be configured as follows.
A third flow path having an outlet portion disposed in the second pipe and capable of flowing a liquid having a third flow rate smaller than the second flow rate;
A third valve capable of opening and closing the third pipeline;
It has.

  According to such a configuration, seven kinds of liquid can be flowed out of the nozzle in accordance with opening and closing of the first valve, the second valve, and the third valve. The 1st pipe line, 2nd pipe line, and 3rd pipe line are the composition which can flow the liquid of three kinds of flow (1st flow, 2nd flow, and 3rd flow) which realizes 7 kinds of flow. Therefore, the rectification state of the liquid flowing out from each pipe line can be maintained. In any of the seven flow rates that can be realized, the liquid flux flowing out from the nozzle can be within the diameter of the first pipe line. In other words, it is possible to cause liquids with various flow rates to flow out of the nozzle while maintaining the rectified state while suppressing an increase in the size of the flowmeter calibration device 1. Therefore, the flow meter can be accurately calibrated while more various flow rates can be realized.

The nozzle can be configured as follows.
A rectifying structure is provided that is disposed between at least the outer peripheral surface of the second pipe and the inner peripheral surface of the first pipe and imparts flow path resistance.

  A rectifying effect can be enhanced by providing a rectifying structure capable of imparting an appropriate flow path resistance to a conduit through which a relatively large flow rate of liquid flows. Moreover, since the rigidity of the pipe line is increased by the rectifying structure, vibration due to the flow of the liquid is suppressed, and the rectifying effect can be further enhanced. Therefore, the calibration of the flow meter can be executed more accurately.

In this case, the nozzle can be configured as follows.
The rectifying structure includes a plurality of thin tubes.

  According to such a configuration, it is easy to adjust the flow path resistance provided by the rectifying structure according to the length of the thin tube. Therefore, the calibration of the flow meter can be executed more accurately.

In this case, the nozzle can be configured as follows.
Among the plurality of thin tubes, the thin tube disposed on the radially outer side of the first conduit is longer than the narrow tube disposed on the radially inner side of the first conduit.

  The inventors have increased the flow velocity radially inward from the radially outer side of the flux of liquid flowing out from the nozzle, whereby the liquid flowing radially outside is attracted to the liquid flowing radially inward, and the rectification state is I found it stable. According to said structure, the flow path resistance higher than the liquid which flows the radial inside of a 1st pipe line is provided to the liquid which flows radially outside. Thereby, even when a liquid flows out only from the 1st pipe line, a stable rectification state can be maintained. Therefore, the calibration of the flow meter can be executed more accurately.

The nozzle can be configured as follows.
The rectifying structure is
A plurality of first capillaries arranged in the first conduit;
A plurality of second capillaries arranged in the second conduit;
Contains
The plurality of first pipelines are longer than the second pipeline.

  According to the above configuration, higher flow resistance is given to the liquid flowing radially outside than the liquid flowing radially inside the nozzle. Thereby, even when the liquid flows out from both the first pipeline and the second pipeline, a stable rectification state can be maintained. Therefore, the calibration of the flow meter can be executed more accurately.

In this case, the nozzle can be configured as follows.
Among the plurality of second tubules, the second tubule disposed on the radially outer side of the second conduit is longer than the second tubule disposed on the radially inner side of the second conduit.

  According to said structure, the flow path resistance higher than the liquid which flows into the radial inside of a 2nd pipe line is provided to the liquid which flows radially outside. Thereby, a stable rectification state can be maintained even when the liquid flows out only from the second pipeline. Therefore, the calibration of the flow meter can be executed more accurately.

The nozzle can be configured as follows.
The first pipeline and the second pipeline are arranged concentrically.

  According to such a configuration, the flux distribution of the liquid flowing out from the nozzle through the first pipeline and the second pipeline is stabilized, and the rectification state can be easily maintained. Therefore, the calibration of the flow meter can be executed more accurately.

The nozzle can be configured as follows.
The third pipeline is disposed concentrically with at least one of the first pipeline and the second pipeline.

  According to such a configuration, the flux distribution of the liquid flowing out from the nozzle through the third conduit and at least one of the first conduit and the second conduit is stabilized, and the rectification state can be easily maintained. Therefore, the calibration of the flow meter can be executed more accurately.

The nozzle can be configured as follows.
A first exhaust valve provided in the first pipe and capable of discharging air in the first pipe, and a second exhaust provided in the second pipe and capable of discharging air in the second pipe At least one of a valve and a third exhaust valve provided in the third pipe and capable of discharging air in the third pipe is provided.

  Air causes liquid flow rate fluctuations due to its compressibility. The flow rate fluctuation causes an error in the amount of liquid obtained in the weighing unit via the diverter. This error can prevent accurate calibration of the flow meter. According to the configuration as described above, the air that causes the accurate calibration of the flowmeter can be discharged from the corresponding pipe line. Thereby, the flow volume fluctuation | variation of a liquid is suppressed and the maintenance of a rectification state becomes easy. Therefore, the calibration of the flow meter can be executed more accurately.

In order to achieve the above object, a second aspect of the present invention is an apparatus for calibrating a flow meter for measuring a flow rate of a liquid flowing through a pipe,
The nozzle forming the outlet of the conduit;
A weighing unit;
A discharge section;
A diverter that switches the destination of the liquid flowing out of the nozzle between the weighing section and the discharge section;
A calibration unit that calibrates the flow meter based on the weight of the liquid measured by the weighing unit and the flow rate measured by the flow meter;
It has.

It is a figure which shows typically the structure of the flowmeter calibration apparatus which concerns on one Embodiment. It is a figure which shows typically the structure of the rectification nozzle in the said flowmeter calibration apparatus. It is a figure which shows the structure in the exit of the said rectifying nozzle in detail.

  Exemplary embodiments will be described in detail below with reference to the accompanying drawings.

  FIG. 1 schematically shows a flowmeter calibration apparatus 1 according to an embodiment. The flow meter calibration device 1 is a device that calibrates the flow meter 11 that measures the flow rate of the liquid flowing through the conduit 10.

  The flowmeter calibration device 1 includes a rectifying nozzle 2. The rectifying nozzle 2 is attached to the pipe line 10 to form an outlet of the pipe line 10.

  The flow meter calibration device 1 includes a diverter 3, a weighing unit 4, and a discharge unit 5. The diverter 3 is configured to switch the destination of the liquid flowing out from the rectifying nozzle 2 between the weighing unit 4 and the discharge unit 5. The flow rate of the liquid flowing through the pipe line 10 is defined as the volume of the liquid flowing through the pipe line 10 within a unit time. Therefore, the diverter 3 directs the liquid flowing out from the rectifying nozzle 2 to the weighing unit 4 for the unit time. After the unit time has elapsed, the diverter 3 directs the liquid flowing out from the rectifying nozzle 2 toward the discharge unit 5.

  The diverter 3 may be of an appropriate type such as a unidirectional two-blade type or a rotating two-blade type.

  The flowmeter calibration apparatus 1 includes a calibration unit 6. The calibration unit 6 is configured to determine whether the weight of the liquid measured by the weighing unit 4 corresponds to the flow rate of the liquid measured by the flow meter 11. The calibration unit 6 calibrates the flow meter 11 as necessary based on the determination result. That is, the calibration unit 6 is configured to calibrate the flow meter 11 based on the weight of the liquid measured by the weighing unit 4 and the flow rate of the liquid measured by the flow meter 11.

  Next, a specific configuration of the rectifying nozzle 2 will be described with reference to FIGS. 2 and 3. The rectifying nozzle 2 is configured to be connectable to the pipe line 10.

  The rectifying nozzle 2 includes a first pipeline 21. The first pipeline 21 is configured to allow a first flow rate of liquid to flow. The first pipeline 21 communicates with the pipeline 10.

  The rectifying nozzle 2 includes a second pipeline 22. The second pipeline 22 has an outlet 22a. The outlet portion 22 a is disposed in the outlet portion 21 a of the first pipeline 21. The second pipeline 22 is configured to allow a liquid having a second flow rate smaller than the first flow rate to flow. The second pipeline 22 communicates with the pipeline 10.

  The rectifying nozzle 2 includes a third pipeline 23. The third pipeline 23 has an outlet 23a. The outlet part 23 a is disposed in the outlet part 22 a of the second pipeline 22. The third pipe line 23 is configured to allow a liquid having a third flow rate smaller than the second flow rate to flow. The third pipeline 23 communicates with the pipeline 10.

  The rectifying nozzle 2 includes a first valve 24. The first valve 24 is configured to be able to open and close the first pipeline 21. The opening and closing operation of the first pipeline 21 by the first valve 24 may be performed manually or electrically.

  The rectifying nozzle 2 includes a second valve 25. The second valve 25 is configured to be able to open and close the second pipeline 22. The opening / closing operation of the second pipe line 22 by the second valve 25 may be performed manually or electrically.

  The rectifying nozzle 2 includes a third valve 26. The third valve 26 is configured to be able to open and close the third pipeline 23. The opening / closing operation of the third pipeline 23 by the third valve 26 may be performed manually or electrically.

  According to such a configuration, by operating the first valve 24, the second valve 25, and the third valve 26, the flow rate of the liquid flowing out from the rectifying nozzle 2 can be adjusted in seven stages. Specifically, when the first flow rate is A, the second flow rate is B, and the third flow rate is C, the adjustment can be made as shown in Table 1.

  The breaking of the rectification state described above is caused by a mismatch between the flow rate of the liquid flowing out from the nozzle and the diameter of the nozzle. That is, even when the flow rate is small, if the nozzle diameter matches the width of the flux corresponding to the flow rate, breakage of the rectification state due to air intrusion or the like can be avoided. However, since the calibration of the flowmeter is performed based on a plurality of types of flow rates, the nozzle diameter is generally determined so as to cope with a larger flow rate. Therefore, the rectification state is likely to be broken during measurement at a smaller flow rate.

  On the other hand, it is conceivable to provide a plurality of nozzles having a diameter corresponding to a plurality of types of flow rates. However, a space for arranging a plurality of nozzles side by side and a space for arranging a plurality of diverters for receiving liquid flowing out from the plurality of nozzles one-on-one (or a space for arranging a large diverter that can be opposed to all the nozzles) are required. Therefore, an increase in the size of the flowmeter calibration device is inevitable.

  Therefore, the inventors can solve the above-mentioned problem by arranging the outlet of the pipeline that can flow a smaller flow rate of liquid in the pipeline that can flow a larger flow rate of liquid. I found out.

  Specifically, the outlet portion 22a of the second pipeline 22 through which a second flow rate of liquid can flow is inside the first pipeline 21 capable of flowing a first flow rate of liquid larger than the second flow rate. Is arranged. In addition, the outlet 23a of the third conduit 23 that can flow a liquid having a third flow rate smaller than the second flow rate is disposed in the second conduit 22 that can flow a liquid having the second flow rate. ing. Opening and closing of the first pipeline 21, the second pipeline 22, and the third pipeline 23 can be controlled by the first valve 24, the second valve 25, and the third valve 26, respectively.

  According to such a configuration, seven flow rates of liquid can be allowed to flow out of the rectifying nozzle 2 in accordance with the opening and closing of the first valve 24, the second valve 25, and the third valve 26. The first pipeline 21, the second pipeline 22, and the third pipeline 23 are capable of flowing liquids of three kinds of flow rates (first flow rate, second flow rate, and third flow rate) that realize seven flow rates. Since it is configured to be possible, the rectification state of the liquid flowing out from each pipe line can be maintained. In any case of the seven flow rates that can be realized, the flux of the liquid flowing out from the rectifying nozzle 2 can be within the diameter of the first conduit 21. In other words, it is possible to cause a plurality of types of liquids with flow rates maintained in a rectified state to flow out of the rectifying nozzle 2 while suppressing an increase in the size of the flowmeter calibration device 1. In addition, since the enlargement of the diverter 3 can be avoided, a decrease in the operation accuracy of the diverter 3 can also be suppressed. Therefore, the accuracy of the liquid weight measurement in the weighing unit 4 into which the liquid flows in through the diverter 3 is improved, and the calibration of the flow meter 11 can be executed accurately.

  In the present embodiment, the rectifying nozzle 2 includes three pipelines (a first pipeline 21, a second pipeline 22, and a third pipeline 23). However, the number of conduits provided in the rectifying nozzle 2 can be appropriately determined by two or more according to the specifications of the flowmeter calibration device 1.

  Even when the rectifying nozzle 2 is provided with only two pipe lines (the first pipe line 21 and the second pipe line 22), the rectifying nozzle 2 can be opened and closed according to the opening and closing of the first valve 24 and the second valve 25. The flow rate of the flowing liquid can be adjusted in three stages. The first pipe line 21 and the second pipe line 22 are configured to be able to flow liquid of two kinds of flow rates (first flow rate and second flow rate) that realize three flow rates. The rectification state of the liquid flowing out from the tank can be maintained. In any of the three possible flow rates, the liquid flux flowing out from the rectifying nozzle 2 can be contained within the diameter of the first pipe 21. In other words, it is possible to cause a plurality of types of liquids with flow rates maintained in a rectified state to flow out of the rectifying nozzle 2 while suppressing an increase in the size of the flowmeter calibration device 1. In addition, since the enlargement of the diverter 3 can be avoided, a decrease in the operation accuracy of the diverter 3 can also be suppressed. Therefore, the accuracy of the liquid weight measurement in the weighing unit 4 into which the liquid flows in through the diverter 3 is improved, and the calibration of the flow meter 11 can be executed accurately.

  3A shows the outlet 21a of the first pipe 21 in the rectifying nozzle 2, the outlet 22a of the second pipe 22, and the outlet 22a of the third pipe 23 by an arrow IIIA in FIG. The appearance seen from the direction shown is shown.

  In the present embodiment, the rectifying nozzle 2 includes a first rectifying structure 31. The first rectifying structure 31 is disposed between the outer peripheral surface of the second conduit 22 and the inner peripheral surface of the first conduit 21. The first rectifying structure 31 includes a plurality of first tubules 41. The plurality of first thin tubes 41 are sandwiched between the outer peripheral surface of the second conduit 22 and the inner peripheral surface of the first conduit 21 while being in contact with each other. The outer diameter of each first thin tube 41 is smaller than the inner diameter of the first conduit 21. The liquid flowing through the first conduit 21 passes through the gaps formed between the first thin tubes 41 and between the plurality of first thin tubes 41, and flows out from the outlet 21a. Accordingly, the first rectifying structure 31 imparts flow path resistance to the liquid flowing through the first pipe line 21.

  In the present embodiment, the rectifying nozzle 2 includes a second rectifying structure 32. The second rectifying structure 32 is disposed between the outer peripheral surface of the third conduit 23 and the inner peripheral surface of the second conduit 22. The second rectifying structure 32 includes a plurality of second capillaries 42. The plurality of second thin tubes 42 are sandwiched between the outer peripheral surface of the third conduit 23 and the inner peripheral surface of the second conduit 22 while being in contact with each other. The outer diameter of each second narrow tube 42 is smaller than the inner diameter of the second conduit 22. The liquid flowing through the second conduit 22 passes through the gaps formed between the respective second capillaries 42 and between the plurality of second capillaries 42 and flows out from the outlet portion 22a. Therefore, the second rectifying structure 32 provides flow path resistance to the liquid flowing through the second pipeline 22.

  The rectifying effect can be enhanced by providing a structure capable of imparting an appropriate flow path resistance to a conduit through which a relatively large flow rate of liquid flows. Moreover, since the rigidity of the pipe line is increased by the structure, vibration due to the flow of the liquid is suppressed, and the rectifying effect can be further enhanced. Therefore, calibration of the flow meter 11 can be executed more accurately.

  In the present embodiment, the first rectifying structure 31 and the second rectifying structure 32 include a plurality of first capillaries 41 and a plurality of second capillaries 42, respectively. However, the first rectifying structure 31 and the second rectifying structure 32 can take any appropriate form as long as an appropriate flow path resistance can be imparted in order to maintain a stable rectifying state. Examples of other embodiments include a net-like structure, and an annular structure formed by a bent plate-like member. When a plurality of thin tubes are used as the first rectifying structure 31 and the second rectifying structure 32, there is an advantage that the flow path resistance can be easily adjusted according to the length. Therefore, calibration of the flow meter 11 can be executed more accurately.

  In the present embodiment, a first rectification structure 31 is provided in the first pipeline 21, and a second rectification structure 32 is provided in the second pipeline 22. However, according to the specification of the flowmeter calibration apparatus 1, only the first rectifying structure 31 may be provided. Moreover, it is good also as a structure by which the same rectification | straightening structure is provided in the 3rd pipe line 23. FIG.

  In the embodiment in which the rectifying nozzle 2 includes only the first pipeline 21 and the second pipeline 22, a configuration in which the rectification structure is provided only in the first pipeline 21 is preferable.

  FIG. 3B shows a cross section viewed from the arrow direction along line IIIB-IIIB in FIG.

  In the present embodiment, among the plurality of first capillaries 41 arranged in the first duct 21, the first capillaries 41 arranged on the radially outer side of the first duct 21 are the first ducts 21. It is longer than the 1st thin tube 41 arrange | positioned at radial inside. In FIG. 3B, the plurality of first tubules 41 include first tubules 41a, 41b, and 41c. The first thin tube 41b is disposed on the radially outer side of the first conduit 21 with respect to the first thin tube 41a. The first capillary 41b is longer than the first capillary 41a. Therefore, the first capillary 41b can provide higher flow resistance than the first capillary 41a. The first thin tube 41c is disposed on the radially outer side of the first conduit 21 with respect to the first thin tube 41b. The first capillary 41c is longer than the first capillary 41b. Therefore, the first capillary 41c can provide higher flow resistance than the first capillary 41b.

  The inventors increase the flow velocity radially inward from the radially outer side of the flux of the liquid flowing out from the rectifying nozzle 2, so that the liquid flowing in the radially outer side is attracted to the liquid flowing in the radially inner side and rectified. We found that the condition is stable. According to the above configuration, higher flow resistance is imparted to the liquid flowing in the radially outer side than the liquid flowing in the radially inner side of the first pipe line 21. Thereby, even when a liquid flows out only from the 1st pipe line 21, a stable rectification state can be maintained. Therefore, calibration of the flow meter 11 can be executed more accurately.

  In the present embodiment, among the plurality of second narrow tubes 42 disposed in the second conduit 22, the second narrow tube 42 disposed on the radially outer side of the second conduit 22 is the second conduit 22. It is longer than the 2nd thin tube 42 arrange | positioned at radial inside. In FIG. 3B, the plurality of second tubules 42 include second tubules 42a and 42b. The 2nd thin tube 42b is arrange | positioned in the radial direction outer side of the 2nd pipe line 22 rather than the 2nd thin tube 42a. Therefore, the second capillary 42b can provide a higher flow resistance than the second capillary 42a.

  According to the above configuration, a higher flow path resistance is given to the liquid flowing in the radially outer side than the liquid flowing in the radially inner side of the second pipe line 22. Thereby, even when a liquid flows out only from the 2nd pipe line 22, a stable rectification state can be maintained. Therefore, calibration of the flow meter 11 can be executed more accurately.

  In the present embodiment, the plurality of first capillaries 41 disposed in the first conduit 21 are longer than the plurality of second capillaries 42 disposed in the second conduit 22.

  According to the above configuration, higher flow resistance is given to the liquid flowing radially outside than the liquid flowing radially inside the rectifying nozzle 2. Thereby, even when the liquid flows out from both the first pipeline 21 and the second pipeline 22, a stable rectification state can be maintained. Therefore, calibration of the flow meter 11 can be executed more accurately.

  In this case, all the first capillaries 41 can be configured to have the same length. Moreover, all the 2nd thin tubes 42 can be set as the structure which has the same length.

  In the present embodiment, as shown in FIG. 2, the first pipeline 21 and the second pipeline 22 are arranged concentrically with respect to the axis A.

  According to such a configuration, the flux distribution of the liquid flowing out from the rectifying nozzle 2 through the first pipe line 21 and the second pipe line 22 is stabilized, and the rectification state can be easily maintained. Therefore, calibration of the flow meter 11 can be executed more accurately.

  In the present embodiment, as shown in FIG. 2, the third pipeline 23 is disposed concentrically with the first pipeline 21 and the second pipeline 22 with respect to the axis A.

  According to such a configuration, the flow distribution of the liquid flowing out from the rectifying nozzle 2 through the third pipe 23 and at least one of the first pipe 21 and the second pipe 22 is stabilized, and the rectification state is maintained. It becomes easy. Therefore, calibration of the flow meter 11 can be executed more accurately.

  From this point of view, the third pipeline 23 may be arranged concentrically only with either the first pipeline 21 or the second pipeline 22.

  The rectifying nozzle 2 of the present embodiment includes a first exhaust valve 27, a second exhaust valve 28, and a third exhaust valve 29 as shown in FIG. The first exhaust valve 27 is provided in the first pipeline 21. The 1st exhaust valve 27 is comprised so that the air in the 1st pipe line 21 can be discharged | emitted. The second exhaust valve 28 is provided in the second pipeline 22. The second exhaust valve 28 is configured to be able to discharge air in the second pipeline 22. The third exhaust valve 29 is provided in the third pipeline 23. The 3rd exhaust valve 29 is comprised so that the air in the 3rd pipe line 23 can be discharged | emitted.

  Air causes liquid flow rate fluctuations due to its compressibility. The flow rate fluctuation causes an error in the amount of liquid obtained by the weighing unit 4 via the diverter 3. This error becomes a cause of hindering accurate calibration of the flow meter 11. According to the configuration as described above, the air that hinders accurate calibration of the flow meter 11 can be discharged from the corresponding pipe line. Thereby, the flow volume fluctuation | variation of a liquid is suppressed and the maintenance of a rectification state becomes easy. Therefore, calibration of the flow meter 11 can be executed more accurately.

  The above embodiment is merely an example for facilitating understanding of the present invention. The configuration according to the above embodiment can be changed or improved as appropriate without departing from the spirit of the present invention. In addition, it is obvious that equivalents are included in the technical scope of the present invention.

  For example, the layout of the first pipeline 21, the second pipeline 22, and the third pipeline 23 is not limited to the example shown in FIG. The first pipeline 21, the second pipeline 22, and the third pipeline 23 are each in communication with the pipeline 10, and the outlet 22 a of the second pipeline 22 is disposed in the first pipeline 21. If the three pipe lines 23 are arranged in the second pipe line 22, the layout of these pipe lines can be appropriately determined according to the specifications of the flowmeter calibration device 1.

  The arrangement of the first exhaust valve 27, the second exhaust valve 28, and the third exhaust valve 29 is not limited to the example shown in FIG. The first exhaust valve 27, the second exhaust valve 28, and the third exhaust valve 29 are located at positions where air can easily collect depending on the layout of the first conduit 21, the second conduit 22, and the third conduit 23. It can be arranged appropriately. Further, at least one of the first exhaust valve 27, the second exhaust valve 28, and the third exhaust valve 29 is omitted depending on the layout of the first conduit 21, the second conduit 22, and the third conduit 23. Can be done.

  In the above embodiment, each of the first valve 24, the second valve 25, and the third valve 26 is configured to take either a fully open state or a fully closed state of the corresponding pipe line. . The diameter of each of the first pipeline 21, the second pipeline 22, and the third pipeline 23 can realize a plurality of types of flow rates required from the calibrated flow meter 11, and each pipeline The velocity of the flowing liquid is determined to be within a certain range. However, if this condition can be satisfied, at least one of the first valve 24, the second valve 25, and the third valve 26 can be in an intermediate state between a fully opened state and a fully closed state. Can be configured. In this case, the degree of freedom in selecting the diameters of the first pipeline 21, the second pipeline 22, and the third pipeline 23 is increased.

  1: flow meter calibration device, 2: rectifying nozzle, 3: diverter, 4: weighing unit, 5: discharge unit, 6: calibration unit, 10: pipe, 11: flow meter, 21: first pipe, 21a: Outlet part, 22: second pipe line, 22a: outlet part, 23: third pipe line, 23a: outlet part, 24: first valve, 25: second valve, 26: third valve, 27: first exhaust Valve: 28: second exhaust valve, 29: third exhaust valve, 31: first rectifying structure, 32: second rectifying structure, 41: a plurality of first capillaries, 41a, 41b, 41c: first capillaries, 42: a plurality of second tubules, 42a, 42b, 42c: second tubules

Claims (12)

A nozzle equipped in a flowmeter calibration device,
A first conduit capable of flowing a first flow rate of liquid;
A second conduit having an outlet disposed in the first conduit and capable of flowing a liquid having a second flow rate less than the first flow rate;
A first valve capable of opening and closing the first conduit;
A second valve capable of opening and closing the second pipe line;
With
nozzle. An outlet section disposed in the second conduit, a third conduit capable of supplying a third flow of liquid less than the second flow rate,
A third valve capable of opening and closing the third pipeline;
With
The nozzle according to claim 1. It is disposed between at least the outer peripheral surface of the second pipeline and the inner peripheral surface of the first pipeline, and includes a rectifying structure that imparts flow resistance.
The nozzle according to claim 1 or 2. The rectifying structure includes a plurality of thin tubes,
The nozzle according to claim 3. Among the plurality of thin tubes, the thin tube disposed on the radially outer side of the first conduit is longer than the narrow tube disposed on the radially inner side of the first conduit,
The nozzle according to claim 4. The rectifying structure is
A plurality of first capillaries arranged in the first conduit;
A plurality of second capillaries arranged in the second conduit;
Contains
The plurality of first capillaries are longer than the plurality of second capillaries ,
The nozzle according to claim 3 or 4. Of the plurality of second capillaries, the second capillaries arranged on the radially outer side of the second conduit are longer than the second capillaries arranged on the radially inner side of the second conduit,
The nozzle according to claim 6 . The first pipeline and the second pipeline are arranged concentrically,
The nozzle according to any one of claims 1 to 6. The third pipeline is arranged concentrically with at least one of the first pipeline and the second pipeline,
The nozzle according to any one of claims 2 to 7. A first exhaust valve provided in the first pipe and capable of discharging air in the first pipe; and a second exhaust valve provided in the second pipe and capable of discharging air in the second pipe. Having at least one of the exhaust valves,
The nozzle according to claim 1. A first exhaust valve provided in the first pipe and capable of discharging air in the first pipe, and a second exhaust provided in the second pipe and capable of discharging air in the second pipe A valve, and at least one of a third exhaust valve provided in the third pipe and capable of discharging air in the third pipe;
The nozzle according to any one of claims 2 to 8. An apparatus for calibrating a flow meter for measuring a flow rate of a liquid flowing through a pipe,
The nozzle according to any one of claims 1 to 10, which forms an outlet of the pipeline,
A weighing unit;
A discharge section;
A diverter that switches the destination of the liquid flowing out of the nozzle between the weighing section and the discharge section;
A calibration unit that calibrates the flow meter based on the weight of the liquid measured by the weighing unit and the flow rate measured by the flow meter;
With
Flow meter calibration device.

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