JP2006030056A - Circulation characteristic evaluating facility of gas circulation equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To evaluate gas circulation equipment at a high pressure or high flow rate without separately preparing a power source. <P>SOLUTION: A gas supply pipeline 1 having a high pressure pipeline 11 and a low pressure pipeline 13 connected to the high pressure pipeline 11 via a through a governor 120 is used, a connection pipe 20 to which gas flowing due to pressure difference between the high pressure pipeline 11 and low pressure pipeline 11 is supplied is disposed, and a reference flowmeter 22 and gas flowmeter 21 to be evaluated are inserted into the connection pipe 20 in series. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flow characteristic evaluation facility for performing flow characteristic evaluation on a gas flow rate device such as a gas flow meter.

  In general, in various devices related to gas distribution (gas flowmeters, valves, governor devices, etc., hereinafter referred to as gas distribution devices), it is evaluated whether the distribution characteristics or airtight characteristics are appropriate after the manufacture of the apparatus. An evaluation test is performed, and only those whose results are appropriate are used for actual gas distribution, thereby ensuring the security of gas distribution.

  2. Description of the Related Art Conventionally, as an apparatus for evaluating a gas distribution device, an apparatus that performs evaluation by supplying pressurized air to the gas distribution device and comparing the distribution characteristics at that time with reference characteristics has been adopted. .

  Patent Document 1 listed below describes a gas meter calibration device that performs a flow rate test and a leak test on a gas meter as one of such conventional techniques. According to this gas meter calibration apparatus, for a flow rate test, a plurality of gas meters to be tested are arranged, and a sonic nozzle capable of selecting a reference flow rate is interposed in a gas meter line connecting these gas meters in series, and downstream of the gas meter line. A predetermined reference air flow rate is caused to flow through each gas meter by suction of a connected vacuum pump, and the gas meter is evaluated by comparing the flow rate display of each gas meter with a reference value.

Japanese Patent Laid-Open No. 7-243898

  According to such a conventional technique, since a pressurized air source such as a vacuum pump or a compressor is used to flow a reference flow rate to a device to be evaluated such as a gas meter, a power source is required for the evaluation test, If an evaluation is performed under a large flow rate condition, a large amount of power is required according to the evaluation, and thus there is an inconvenience that a large cost is required for evaluating the gas distribution device. In addition, there is a problem that the degree of pressurization is limited in a power source such as a pump, and it is not possible to perform an evaluation test under a sufficiently high pressure or large flow rate condition on a gas distribution device laid in a high pressure conduit. is there.

  In addition, since air is used as the test fluid, there is a problem that an error is likely to occur due to a specific gravity difference between the air and the gas used in the gas distribution device, and accurate evaluation cannot be performed.

  The present invention has been proposed to deal with such problems, and in part, it is possible to evaluate a gas distribution device at a high pressure or a large flow rate without separately preparing a power source. It is also an object of the present invention that, for example, a highly accurate evaluation is possible by an evaluation using a gas used in a gas distribution device.

  The features of the present invention for achieving such an object are as follows.

  One is a distribution characteristic evaluation facility for evaluating distribution characteristics of a gas distribution device, and includes a high-pressure pipeline and a low-pressure pipeline connected to the high-pressure pipeline via a governor. A connecting pipe to which a gas flow flowing due to a pressure difference between the high-pressure pipeline and the low-pressure pipeline is provided, and a reference flow meter and a gas flow meter to be evaluated are inserted in series in the connecting pipe It is characterized by.

  Further, one is a distribution characteristic evaluation facility for a gas distribution device having the above-described characteristics, wherein the connection pipe forms a bypass line that branches and merges with a gas supply pipeline upstream or downstream of the governor. It is characterized by doing.

  One is a distribution characteristic evaluation facility for a gas distribution device having the above-described characteristics, in which two governors are arranged in series, and the connection pipe is connected to a gas supply pipeline between the two governors. A bypass line that branches and merges is formed.

  Further, one is a flow characteristic evaluation facility for a gas flow device having the above-described characteristics, wherein the reference flow meter is connected in parallel so that a plurality of flow meters can be selected.

  One is a distribution characteristic evaluation facility for a gas distribution device having the above-described characteristics, which is supplied to the connection pipe on the upstream side of the low-pressure pipeline and to the gas supply pipeline on the downstream side of the connection pipe. A gas holder for temporarily storing the gas flow is provided.

  In another aspect, the flow characteristic evaluation facility for a gas flow device having the above-described characteristics is characterized in that the governor has a pressure adjustment function capable of changing a gas flow supply pressure to the connection pipe. .

  Another one is a flow characteristic evaluation facility for a gas flow device having the above-described characteristics, characterized in that the connection pipe can be inserted with another type of gas flow device instead of the gas flow meter. To do.

  In another aspect, the flow characteristic evaluation facility for a gas flow device having the above-described features is characterized in that the gas supply pipeline includes a heater for setting the temperature of the gas flow supplied to the connection pipe. And

  In another aspect, the flow characteristic evaluation facility for a gas flow device having the above-described characteristics is characterized in that the gas supply pipeline includes a measurement device capable of measuring the pressure and temperature of the connection pipe.

  According to the distribution characteristic evaluation facility of the gas distribution equipment having such characteristics, the gas flow without using a power source is required by using the gas flow flowing from the high pressure gas supply source to the low pressure pipeline through the high pressure pipeline and the governor. It is possible to perform a total evaluation test. In particular, since a relatively large pressure difference can be formed through the governor, an evaluation test can be performed under high pressure or a large flow rate.

  In the present invention, a gas flow that flows due to a pressure difference between the high-pressure pipeline and the low-pressure pipeline is supplied to a connecting pipe provided in the gas supply pipeline. Since the same flow rate of gas flows through the reference flowmeter inserted in series in this connection pipe and the gas flowmeter to be evaluated, the difference between the measured values of the reference flowmeter and the gas flowmeter to be evaluated is detected. Thus, it is possible to evaluate whether or not the gas flow meter to be evaluated matches the reference.

  In addition, by matching the gas in the gas supply pipeline with the gas flowing through the equipment where the gas flow meter is used, it becomes possible to evaluate the gas flow meter using the actual gas used, such as the difference in specific gravity, etc. Highly accurate evaluation can be performed without errors.

  Then, by connecting a pipe into which the reference flow meter and the gas flow meter to be evaluated are inserted, a bypass line that branches and merges with the gas supply pipeline upstream or downstream of the governor is formed, so that the normal gas supply pipe It is possible to perform an evaluation test of the gas flow meter without stopping the gas supply by the line.

  In addition, by arranging two governors in series in the gas supply pipeline and forming a connection pipe that branches and merges with respect to the gas supply pipeline between the two governors, the pressure of the connection pipe is increased on the high-pressure pipeline side. The pressure can be set to an intermediate pressure between the pressure and the pressure on the low pressure pipeline side, and the pressure in the gas flow meter evaluation test can be set regardless of the demand pressure of the low pressure pipeline. Thereby, the freedom degree of an evaluation test can be raised.

  Furthermore, by configuring the reference flow meter inserted into the connecting pipe so that a plurality of flow meters can be selected in parallel, different types of gas distribution devices can be provided according to each selected reference. It becomes possible to evaluate.

  Further, the gas flow supplied to the connection pipe is temporarily stored in the gas supply pipeline on the downstream side of the connection pipe in which the reference flow meter and the gas flow meter to be evaluated are inserted on the upstream side of the low-pressure pipeline. By providing the gas holder, regardless of the demand flow rate of the low-pressure pipeline, it is possible to swallow the gas flow at a constant flow rate that has flowed through the connecting pipe into the gas holder for a long time. As a result, the gas flow meter can be evaluated at a desired flow rate regardless of the demand on the low-pressure pipeline side. Furthermore, since the pressure fluctuation of the governor necessary for the evaluation test can be absorbed by this gas holder, it is possible to form an evaluation facility that does not affect the gas supply on the low-pressure pipeline side.

  Furthermore, by providing the governor of the gas supply pipeline with a pressure adjusting function, the gas flow supply pressure to the connection pipe in which the reference flow meter and the gas flow meter to be evaluated are inserted can be made variable. As a result, evaluation tests at various flow rates are possible, and the degree of freedom of the evaluation test can be increased.

  In addition, by enabling the insertion of other types of gas distribution devices such as governors and valves in place of the gas flowmeters inserted into the connection pipe, various gas distribution devices can be inserted, and the gas distribution devices can be An airtight test or a flow test can be performed.

  In addition, since the gas supply pipeline has a heater that sets the temperature of the gas flow supplied to the connecting pipe, the temperature of the gas flow that is lowered by the pressure reduction of the governor is adjusted, and the evaluation test is performed in an appropriate state. It can be carried out. Furthermore, by providing a measuring device capable of measuring the pressure and temperature of the connecting pipe in the gas supply pipeline, an appropriate evaluation test can be performed while keeping the gas flow flowing through the connecting pipe in a standard state.

  By providing such a feature, the present invention makes it possible to evaluate a gas distribution device at a high pressure or a large flow rate without separately preparing a power source. By matching the gas used in the gas distribution device, it becomes possible to perform a more accurate evaluation using the actual gas used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram for explaining a flow characteristic evaluation facility for a gas flow device according to an embodiment of the present invention. This distribution characteristic evaluation facility uses a supply gas flow of the gas supply pipeline 1 to flow a gas flow of a predetermined flow rate to a gas distribution device such as a gas flow meter, and performs an evaluation test of the distribution characteristic or the airtight characteristic. is there.

  The gas supply pipeline 1 used here is connected to the high-pressure pipeline 11 through which a high-pressure gas derived directly from a gas supply source or through some pressure regulating equipment is circulated, and is connected to the high-pressure pipeline 11 to obtain a high pressure. A governor facility 12 that regulates the high-pressure gas flow from the pipeline 11, and a low-pressure pipeline 13 that is connected to the downstream side of the governor facility 12 and circulates the low-pressure gas flow decompressed by the governor facility 12 are provided.

  As the governor facility 12, for example, control valves 121 and 122 are provided on both the upstream and downstream sides of the governor 120, a bypass path branching and joining from the main gas flow path 10 is provided, and a valve 123 is provided there. Can be adopted. Here, the governor 120 preferably has a pressure adjusting function, and thereby, the gas supply pressure on the downstream side can be variably adjusted. Further, if necessary, a heater 14 is provided on the upstream side of the governor facility 12, and the temperature of the gas flow that is lowered by passing through the governor 120 is adjusted to the set temperature.

  An important configuration of the gas supply pipeline 1 used here is to form a pressure difference between the high-pressure pipeline 11 and the low-pressure pipeline 13 by the governor 120, and the gas flow flowing by this pressure difference is evaluated. It will be supplied to the target gas distribution equipment.

  In this embodiment, a gas flow meter is targeted as a gas distribution device to be evaluated. The gas flow meter 21 is inserted into the connection pipe 20 together with the reference flow meter 22, and the reference flow meter 22 and the gas flow meter 21 to be evaluated are inserted in series in the connection pipe 20.

  The connection pipe 20 is connected to the main gas flow path 10 of the gas supply pipeline 1 so that a gas flow that flows due to a pressure difference between the high-pressure pipeline 11 and the low-pressure pipeline 13 is supplied. In the illustrated example, the connection pipe 20 forms a bypass line that branches and merges with the gas supply pipeline 1 (the gas flow path 10) on the downstream side of the governor 120. Alternatively, a bypass line may be formed that branches and merges with the gas supply pipeline 1 (gas flow path 10) on the upstream side.

The connecting pipe 20 forms a straight runs by sufficient linear pipe provided in parallel in the gas flow passage 10 ₁ which is secured, thereby, the gas stream flowing through the connecting tube 20 Rectification is ensured. Further, the connecting tube 20 and the gas distribution channels 10 _1, optionally valve b1~b6 for path-blocking is deployed. Furthermore, you may provide the diffusion end 30 which diffuses the gas flow supplied to the connection pipe 20 in the downstream of the connection pipe 20 as needed.

Further, although not shown, provided with a measuring device capable of measuring the pressure and temperature in the connecting tube 20 or gas distribution channel 10 _1, by adjusting the heat exchange capacity of the heater 14 by the output of the measuring device, the connecting tube 20 You may enable it to maintain the state of the flowing gas flow in a standard state.

According to the distribution characteristic evaluation facility of the gas distribution device according to such an embodiment, the gas flow flowing from the gas supply source is supplied to the governor facility 12 via the high-pressure pipeline 11. At that time, heating by the heater 14 is performed as necessary. Gas flow passing through the governor facility 12 is depressurized by receiving a integer pressure effect of the governor 120, flows into the low pressure pipeline 13 downstream through the gas distribution channels 10 ₁ and the connection pipe 20.

  Here, in the embodiment of the present invention, a gas flow that flows due to a pressure difference between the high-pressure pipeline 11 and the low-pressure pipeline 13 is supplied to the connection pipe 20. That is, the gas flow flowing through the connecting pipe 20 can be adjusted by appropriately setting this pressure difference. When the governor 120 has a pressure adjusting function, the flow rate of the gas flow flowing through the connecting pipe 20 can be variably set by the pressure adjusting function.

  Since the reference flow meter 22 and the gas flow meter 21 to be evaluated are inserted in series in the connection pipe 20, measurement of the gas flow meter 21 is performed using a single gas flow rate flowing through the connection pipe 20. The gas flow meter 21 is corrected by comparing the value with the reference measurement value of the reference flow meter 22. At this time, if the flow rate of the gas flow flowing through the connecting pipe 20 is variably adjusted as described above, an evaluation test of the gas flow meter 21 based on various flow rates can be performed.

  According to this, since the gas flow flowing through the connection pipe 20 is partially branched from the gas flow flowing through the gas supply pipeline 1, power equipment such as a pump and a compressor and a power source that generate the gas flow are used. It becomes unnecessary, and the evaluation test of the gas flow meter 21 can be performed with energy saving and low cost. Further, since a relatively large pressure difference can be formed through the governor 120, an evaluation test under a high pressure or a large flow rate situation is possible.

Then, the connecting tube 20 and features a gas distribution channel 10 ₁ of the gas supply pipe line 1, so to form a bypass line branching-confluence for this gas flow passage 10 _1, the evaluation of the gas flow meter 21 the gas flow through the gas flow path 10 ₁ and the connection tube 20 also while tested can always be supplied to the downstream of the low-pressure pipeline 13. As a result, the gas flow meter 21 can be evaluated without stopping the gas supply.

  At this time, by securing a sufficient straight path for the connecting pipe 20, the gas flow flowing through the connecting pipe 20 can be rectified, and an evaluation test based on stable and highly accurate measurement values can be performed. In addition, the temperature or pressure of the gas flow supplied to the connecting pipe 20 can be set to a standard state by variably adjusting the heat exchange capacity of the heater 14 in accordance with the pressure adjustment of the governor 120. A highly accurate evaluation test can be performed. In that case, the state of the gas flow is set to a standard state based on a measurement value by a pressure gauge or a thermometer (not shown) provided in the connection pipe 20 or the like.

  Further, since the radiating end 30 is provided on the downstream side of the connecting pipe 20, when the demand in the downstream low pressure pipeline 13 does not correspond to the set pressure of the governor 120, the valve b6 is opened and radiated. It is also possible to adjust the flow rate of the gas flow that flows through the connecting pipe 20 by dissipating excess gas from the end 30.

  FIG. 2 is an explanatory view showing another embodiment of the present invention. Portions common to the above-described embodiment are denoted by the same reference numerals, and a part of overlapping description is omitted.

In this embodiment, two governor facilities 12 (12A, 12B) are provided in series in the gas supply pipeline 1, and the connection pipe 20 is connected to the gas supply pipeline 1 (between these two governor facilities 12A, 12B ( The gas flow path 10 ₁ ) is connected so as to form a bypass line that branches and merges.

Further, the reference flow meter group 220 is arranged to form a reference flow meter group 220 including a plurality of flow meters in which the reference flow meters into which the connecting pipe 20 is inserted. The reference flow meter group 220 includes a plurality of reference flow meters 22. ₁ , 22 ₂ ,... 22 _n are inserted into a plurality of paths 20 a connected in parallel to the connecting pipe 20. It is further each reference meter ₂₂ 1, ₂₂ 2, ... 22 valve _b2 1 on the upstream side and downstream side of the _{n, b3 1 (b2 2,} b3 2, ... b2 n, b3 n) is deployed.

Further, a plurality of parallel paths 20b are formed in the connection pipe 20, and a test section 210 in which a gas flow device such as a gas flow meter can be inserted into the connection pipe 20 and the parallel path 20b is formed. Valves b4 ₁ , b5 ₁ (b4 ₂ , b5 ₂ ,... B4 _n , b5 _n ) are arranged upstream and downstream of the test section 210 in each parallel path 20b.

  In addition, a gas holder 15 for temporarily storing the gas flow supplied to the connection pipe 20 is provided in the gas supply pipeline 1 upstream of the low-pressure pipeline 13 and downstream of the connection pipe 20.

According to such an embodiment, the following operation is obtained in addition to the operation in the above-described embodiment. That is, by deploying two of the governor 120 in series with the gas supply pipe line 1, reference meter _{22 1,} 22 2, ..., the evaluation target 22 _n by the connection tube 20 and the gas circulation device is inserted, the two By forming a bypass line that branches and merges with the gas supply pipeline (gas flow path 10 ₁ ) between the governors 120, the pressure of the connection pipe 20 is changed to the pressure on the high-pressure pipeline 11 side and the low-pressure pipeline 13. The pressure in the gas flow meter evaluation test can be set regardless of the demand pressure of the low-pressure pipeline 13. Thereby, the freedom degree of an evaluation test can be raised.

Furthermore, the reference flowmeters 22 ₁ , 22 ₂ ,..., 22 _n inserted into the connection pipe 20 are connected in parallel in a state where a plurality of flowmeters can be selected, and thus differ according to each selected reference. It is possible to evaluate different types of gas distribution equipment. In the test section 210, various gas distribution devices such as a governor and a valve can be inserted in place of the gas flow meter. Valve _{b2 1, b3 1, b2 2} , b3 2, ... b2 n, b3 n, or valve _{b4 1, b5 1, b4 2} , b5 2, ... b4 n, b5 n desired path by selective opening closure of the Various gas flows inserted into the test section 210 by opening 20a, 20b and connecting in series the reference flow meter selected from the reference flow meter group 220 and the gas flow device inserted into the test section 210. The instrument can be evaluated and tested with a suitable reference flow meter.

  When various gas flow devices are inserted into the test section 210, measurement devices necessary for the evaluation test of the gas flow device, such as a pressure gauge and a thermometer (thing that detects a standard state), or a vibration meter , Deploy a sound level meter or the like in the test section 210 As a result, various tests necessary for the gas distribution device to be inserted can be performed simultaneously.

  When the gas distribution device to be evaluated is a governor, the standard governor characteristics are maintained even when the flow rate changes, the governor adjustment function functions normally, or noise generated upstream or downstream of the governor Since whether or not the relationship between the flow rate and the flow rate is within an allowable range is an object of the evaluation test, various measuring devices are provided in the test section 210 so that a measurement result that can be evaluated is obtained.

  Further, by providing the gas holder 15 in the gas supply pipeline 1 upstream of the low-pressure pipeline 13 and downstream of the connection pipe 20, a constant flow rate flowing through the connection pipe 20 regardless of the demand flow rate of the low-pressure pipeline 13. The gas flow can be swallowed into the gas holder 15 for a long time. As a result, the gas flow meter can be evaluated at a desired flow rate regardless of the demand on the low-pressure pipeline 13 side. Furthermore, since the gas holder 15 can absorb the pressure fluctuation of the governor necessary for the evaluation test, an evaluation test that does not affect the gas supply on the low pressure pipeline 13 side can be performed.

  In each of the above-described embodiments, a highly accurate evaluation test is performed by matching the gas flowing in the gas supply pipeline 1 with the gas used in the gas distribution device such as a gas flow meter to be evaluated. It becomes possible.

It is explanatory drawing which shows the distribution characteristic evaluation installation of the gas distribution apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the distribution characteristic evaluation installation of the gas distribution apparatus which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas supply pipeline 10,10 ₁ Gas distribution path 11 High pressure pipeline 12,12A, 12B Governor facilities 120 Governor 121,122 Control valve 13 Low pressure pipeline 14 Heater 15 Gas holder 20 Connection pipe 21 Gas flow meter 210 Test section 22, 22 ₁ , 22 ₂ ,..., 22 _n Reference flow meter 220 Reference flow meter group 30 Dispersion end

Claims (9)

A distribution characteristic evaluation facility for evaluating distribution characteristics of gas distribution equipment,
Using a gas supply pipeline comprising a high-pressure pipeline and a low-pressure pipeline connected to the high-pressure pipeline via a governor,
A connection pipe to which a gas flow flowing due to a pressure difference between the high-pressure pipeline and the low-pressure pipeline is provided, and a reference flow meter and a gas flow meter to be evaluated are inserted in series into the connection pipe. Equipment for evaluating distribution characteristics of gas distribution equipment.   The distribution characteristic evaluation facility for a gas distribution device according to claim 1, wherein the connection pipe forms a bypass line that branches and merges with a gas supply pipeline upstream or downstream of the governor. Two governors are deployed in series;
The distribution characteristic evaluation facility for a gas distribution device according to claim 1, wherein the connection pipe forms a bypass line that branches and merges with respect to a gas supply pipeline between the two governors.   The said reference | standard flow meter is connected in parallel in the state which can select several flow meters, The distribution | circulation characteristic evaluation facility of the gas distribution | circulation apparatus described in any one of Claims 1-3 characterized by the above-mentioned.   The gas holder for temporarily storing the gas flow supplied to the connection pipe is provided in a gas supply pipeline upstream of the low-pressure pipeline and downstream of the connection pipe. Equipment for evaluating distribution characteristics of gas distribution equipment described in any one of the above.   The said governor has the pressure adjustment function which can vary the gas flow supply pressure to the said connection pipe, The distribution characteristic evaluation facility of the gas distribution apparatus described in any one of Claims 1-5 characterized by the above-mentioned.   The said connection pipe can replace with the said gas flowmeter, and can insert another kind of gas distribution apparatus, The distribution characteristic evaluation installation of the gas distribution apparatus in any one of Claims 1-6 characterized by the above-mentioned.   The said gas supply pipeline is provided with the heater which sets the temperature of the gas flow supplied to the said connection pipe, The distribution characteristic evaluation facility of the gas distribution apparatus described in any one of Claims 1-7 characterized by the above-mentioned.   The said gas supply pipeline is provided with the measurement apparatus which can measure the pressure and temperature of the said connection pipe, The distribution characteristic evaluation facility of the gas distribution apparatus described in any one of Claims 1-8 characterized by the above-mentioned.

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