KR101154275B1 - Verification system for flowmeter and test system for pump using the same - Google Patents

Abstract

PURPOSE: A flow meter calibration system and a pump test system using the same are provided to improve the verification reliability of a flow meter by making a flow of calibration fluid circulating constant because a performance of a circulating pump is maintained to be constant by circulating the calibration fluid from a tank. CONSTITUTION: A flow meter calibration system comprises a buffer tank(110), a calibration tank(120), a circulating pump(130), a fluid supply tube(150), and a flow path transform unit(160). The calibration tank comprises a level measuring device measuring a water level of calibration fluid store inside the calibration tank. One end of the fluid supply tube is connected to a flow meter. The flow path transform unit connected to the other side of the fluid supply tube receives the calibration fluid passed through the flow meter and change a flow path of the calibration fluid towards the buffer tank side to the calibration tank side to calibrate the flow meter by comparing the flow rate of the calibration fluid measured by the flow meter and the water level of the calibration fluid inside the calibration tank measured by the water level measuring device.

Description

VERIFICATION SYSTEM FOR FLOWMETER AND TEST SYSTEM FOR PUMP USING THE SAME}

The present invention relates to a flow meter verification system and a pump test system using the same, and more particularly, to improve the verification reliability of the flow meter, and to test the pump performance by using a flow meter having reliability, and a pump using the same. It is about a test system.

As an alternative to the depletion of energy sources, interest in nuclear power is increasing day by day. The dual pressurized water reactor type nuclear power plant uses an average of 2 to 5% of low enriched uranium as the fuel, and the primary system, that is, the reactor coolant system, is a completely closed circuit and is forced by the reactor coolant pump (RCP). It is circulating.

The performance of such a reactor coolant pump is evaluated by measuring input pressure, discharge pressure, and flow rate. However, since the fluid in the reactor coolant pump flows at high temperature and high pressure, it is difficult to trust the result when measuring the flow rate of the fluid flowing through the reactor coolant pump using a general flow meter designed to operate at room temperature and atmospheric pressure. there is a problem.

In addition, in order to use the flow meter after the verification is completed for the purpose of testing the reactor coolant pump, it is necessary to design a separate system, so that the size of the facility increases, and thus there is a problem that the construction cost also increases.

Accordingly, an object of the present invention is to solve such a conventional problem, and to provide a flow meter verification system capable of verifying a flow meter with improved reliability.

In addition, by using the verified flow meter to test the reactor coolant pump using the same system, to provide a pump test system that can ensure the reliability of the performance evaluation while reducing the process cost.

The object is, according to the present invention, a system for calibrating a flow meter, the system for calibrating a flow meter, comprising: a buffer tank in which a calibration fluid is stored; A calibration tank having a level gauge to measure the level of the assay fluid contained therein; A circulation pump for transferring the assay fluid from the buffer tank to the flowmeter side; A fluid supply pipe having one end connected to the flow meter; The flow meter is connected to the other end of the fluid supply pipe and provided with the flow of the calibration fluid passed through the flow meter, and the flow rate of the flow of the calibration fluid measured by the flow meter is compared with the level of the calibration fluid in the calibration tank measured from the level gauge. And a flow path conversion unit for converting the flow path of the assay fluid directed toward the buffer tank side to the assay tank side for calibration, wherein the flow path conversion unit is installed to reciprocate between the assay tank and the buffer tank. A body part connected to an end of the supply pipe provided with an assay fluid, and having a discharge port divided into two flow path spaces formed on either side of the buffer tank or the assay tank; And a drive unit for reciprocating the body portion such that an end portion of the fluid supply pipe communicates with any one of the two flow path spaces partitioned in the body portion.
The apparatus may further include a level holding tank receiving the assay fluid from the buffer tank and maintaining a constant level of the assay fluid contained therein, wherein the circulation tank includes the assay fluid received at a constant level in the tank. It can be transferred to the flow meter side.

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In addition, the buffer tank is disposed adjacent to the water level maintenance tank around the partition wall, and may further include a water level maintenance pump for transferring the assay fluid in the buffer tank to the water level maintenance tank side.

In addition, the flow rate of the black fluid conveyed in the water level holding tank by the water level holding pump may be equal to or more than the flow rate of the black liquid conveyed from the water level holding tank to the flow meter by the circulation pump.

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The apparatus may further include a flow control valve mounted on the fluid supply pipe so that the flow rate of the assay fluid flowing in the fluid supply pipe is adjusted.

Accordingly, the above object, in accordance with the present invention, utilizes a flowmeter calibration system, comprising: a storage tank; A test pump connected to the storage tank; A first flow switching valve provided on the fluid supply pipe and configured to switch the flow path of the assay fluid to the storage tank; And a second flow switching valve provided on the flow path of the assay fluid between the water level holding tank and the circulation pump and switching the flow path so that the assay fluid discharged from the test pump flows to the circulation pump side. A pump test system is featured.

According to the present invention, there is provided a flow meter calibration system in which verification reliability can be improved.

In addition, since the circulation pump circulates the assay fluid from the tank in which the water level is maintained to maintain the performance of the circulation pump to make the flow rate of the circulating assay fluid constant, the verification reliability of the flow meter can be improved.

In addition, by using a flow path converting unit, the flow rate of the fluid flowing through the system can be easily measured by converting the position where the assay fluid is finally stored from the storage tank to the assay tank, and compared with the flow rate of the assay fluid measured by the flow meter.

In addition, a pump test system is provided in which the evaluation reliability of the flow meter can be improved by using the verified flow meter as it is for the pump test after completing the verification for the reliability of the flow meter in the same place in connection with the flow meter verification system.

1 schematically shows a flow meter calibration system according to a first embodiment of the invention,
FIG. 2 is a perspective view of a flow path converting part of the flow meter verification system of FIG. 1;
3 is an exploded perspective view of a flow path conversion unit of the flow meter calibration system of FIG. 2;
4 is an operating perspective view of the flow conversion column of the flow meter calibration system of FIG.
5 is a schematic illustration of the operation of the flow meter calibration system of FIG.
6 schematically shows a flow meter calibration system according to a second embodiment of the invention,
7 is a schematic illustration of a pump test system using the flow meter calibration system of the present invention.

Prior to the description, in the various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, different configurations from the first embodiment will be described. do.

Hereinafter, a flowmeter verification system 100 according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 schematically illustrates a flowmeter calibration system according to a first embodiment of the present invention.

Referring to FIG. 1, the flow meter verification system 100 according to the first embodiment of the present invention includes a buffer tank 110, a black tank 120, a circulation pump 130, a flow meter 140 and a fluid to be tested. It includes a supply pipe 150, the flow path conversion unit 160 and the flow control valve 170.

The buffer tank 110 is a place where the test fluid for temporarily testing the flow rate by flowing in the flow meter 140 of the test target. In the present embodiment, the buffer tank 110 is configured in a tank form that can be recessed to accommodate the assay fluid, but is not limited to such a form.

The assay tank 120 is disposed adjacent to the above-described buffer tank 110 around the partition W1, and is provided in the form of a water tank recessed therein, so that the level gauge of the received calibration fluid can be measured. 121 is mounted.

The circulation pump 130 is forced to circulate the black fluid stored in the buffer tank 110 by a predetermined power from the outside to the flow path conversion unit 160, so that the black fluid passes through the flow meter 140 to be described later It is a member for doing so.

The flow meter 140 is to be tested on the system according to the present embodiment, and measures the flow rate of the assay fluid forcedly circulated from the circulation pump 130.

In the present embodiment, the flow meter 160 to be tested includes a Venturi flow meter, a flow nozzle flow meter, an orifice flow meter, an electromagnetic flowmeter, and a Coriolis flowmeter. Any one may be used, but is not limited to any flow meter that can be subject to calibration to check the flow rate.

The fluid supply pipe 150 has one end connected to the flow meter 140 and the other end connected to the flow path conversion unit 160 described later, so that the black fluid passing through the flow meter 140 flows toward the flow path conversion unit 160. It is a member.

2 is a perspective view of the flow path conversion unit of the flow meter calibration system of FIG. 1, FIG. 3 is an exploded perspective view of the flow path conversion unit of the flow meter calibration system of FIG.

2 and 3, the flow path conversion unit 160 flows the flow path of the black fluid such that the black fluid passing through the flow meter 140 flows into any one selected from the buffer tank 110 or the black tank 120. As a member for converting, the body unit 161 and the driving unit 167 are included.

The body 161 is mounted below the fluid supply pipe 150 so as to be reciprocally moved forward and backward on the partition wall W1 separating the buffer tank 110 and the black tank 120. The member 163, the guide plate 164, the cover plate 165, and the backflow preventing member 166 are included.

The main body 162 is provided below the end of the fluid supply pipe 150 to receive the black fluid discharged from the fluid supply pipe 150, and is partitioned into a plurality of flow path spaces by mounting a partition member 163 therein. Each outlet of the space is configured to face the direction of any one of the buffer tank 110 and the black tank (120).

The guide plate 164 is a plate-shaped member attached to the upper side of the main body 162, the movement path is formed in the center to move in the state in which the end of the fluid supply pipe 150 is accommodated.

The cover plate 165 is interposed between the fluid supply pipe 150 and the guide plate 164 to prevent the black fluid supplied from the fluid supply pipe 150 to the flow path space to flow back out.

The backflow prevention member 166 is inclined downward from the inner wall surface of the main body 162, that is, the inner wall surface of each flow path space so that the black fluid introduced into the main body 162 is unintentionally released to the outside. It is a plate-shaped member which protrudes.

On the other hand, the inside of the main body is partitioned into a front flow path space (S1) and a rear flow path space (S2) by the partition member 163, the outlet of the front flow path space (S1) is connected to the black tank 120, The outlet of the rear passage space S2 is connected to the buffer tank 110.

That is, as shown in Figure 4, the body portion 161 is configured to be moved forward and backward by the drive unit 167 to be described later, the end of the fluid supply pipe 150 fixed by the forward and backward movement is the front flow path space In communication with either one of S1 or the rear flow path space S2, a black fluid is supplied to the inside. At this time, the black fluid accommodated in the rear flow path space (S2) inside the main body 162 is discharged to the buffer tank 110, the black fluid accommodated in the rear flow path space (S1) is discharged to the buffer tank 120 side. It is composed.

The driving unit 167 is a member for applying a transfer force to the body portion 161 so that the body portion 161 can move forward and backward along the partition wall (W1), the pneumatic cylinder is used as the driving unit 167 in this embodiment. However, it is not limited thereto.

That is, the drive unit 167 has a body portion 161 on the partition wall W1 such that the lower side of the fluid supply pipe 150 connected to the flow meter 140 is aligned with either the front flow path space S1 or the rear flow path space S2. ) Is a member for moving back and forth.

The flow rate control valve 170 is a member that is mounted to the fluid supply pipe 150 connecting the flow path conversion unit 160 and the flow meter 140, and controls the flow rate of the black fluid flowing through the inside.

The operation of the first embodiment of the above-described flowmeter calibration system will now be described.

FIG. 5 schematically illustrates the operation of the flow meter calibration system of FIG. 1.

Referring to FIG. 5 (a), first, an end portion of the fluid supply pipe 150 connected to the flowmeter 140 is disposed above the front flow path space of the flow path conversion unit 160, and power is applied to the circulation pump ( 130) is activated. The black fluid stored in the buffer tank by the circulation pump 130 starts flowing to the flowmeter 140, passes through the flow control valve 170, and then opens the rear flow path space S2 in the flow path conversion unit 160. Afterwards, the circulation flow of repeating the operation stored in the buffer tank 110 is started.

On the other hand, before performing the calibration of the flow meter 140, the first level of the assay fluid contained in the assay tank 120 is first measured using the water level gauge 121. After the initial water level measurement is completed, the drive unit 167 of the flow path conversion unit 160 is operated at the time when the flowmeter 140 is calibrated. The body 161 moves forward by the driving unit 167, and at the same time, the lower side of the fluid supply pipe 150 is disposed above the front flow path space S1. Therefore, the assay fluid supplied from the fluid supply pipe 150 flows into the shear flow path space S1.

As shown in Figure 5 (b), by the continuously operating circulation pump 130, the black fluid stored in the buffer tank 110 passes through the flow meter 140, flow control valve 170, While passing through the flow path conversion unit 160, the flow path flows into the black tank 120. Therefore, the circulating flow flowing from the buffer tank 110 back to the buffer tank 110 is stopped, and the conversion fluid flowing out of the buffer tank 110 and introduced into the black tank 120 starts.

At the same time, the change of the water level measured from the level gauge 121 due to the test fluid flowing into the test tank 120 is compared with the flow rate of the test fluid measured by the flow meter 140 to verify the measurement accuracy of the flow meter 140. It becomes possible.

On the other hand, by adjusting the opening degree of the flow control valve 170 to allow the flow rate of various conditions to pass through the flow control valve 170 to circulate the entire system, by measuring the performance of the flow meter 140 for each flow rate of the flow meter 140 The reliability of accuracy can be further improved.

Next, a flow meter verification system according to a second embodiment of the present invention will be described.

6 schematically illustrates a flowmeter calibration system according to a second embodiment of the present invention.

Referring to FIG. 6, the flow meter verification system 200 according to the second embodiment of the present invention includes a buffer tank 110, a black tank 120, a circulation pump 130, a flow meter 140, and a fluid to be tested. It includes a supply pipe 150, the flow path conversion unit 160, the flow control valve 170, the water level holding tank 280 and the water level holding pump 290. However, the buffer tank 110, the black tank 120, the circulation pump 130, the flow meter 140, the fluid supply pipe 150, the flow path conversion unit 160 and the flow control valve 170 of the present embodiment is the first Since the embodiment is the same as the above-described configuration, duplicate description is omitted.

The water level holding tank 280 is a space in the form of a tank disposed adjacent to the above-described buffer tank 110 centering on a predetermined partition wall W2. It is a member for maintaining the performance of the circulation pump 130 to circulate.

That is, when the circulating pump 130 directly transports the black fluid in the buffer tank 110, the performance of the circulating pump 130 transports the black fluid as the level of the black fluid in the buffer tank 110 changes. This changing problem occurs. Therefore, in order to solve this problem, in the present embodiment, the water level holding tank 280 is additionally configured as a space for keeping the water level constant, and the circulation pump 130 transports the assay fluid from the water level holding tank 280.

On the other hand, the partition wall (W2) of the water level holding tank 280 in contact with the buffer tank 110 of the four walls of the water level holding tank 280 is configured to be lower than the remaining wall surface, the water level holding tank 280 from the buffer tank 110 The excess fluid flowing into the) is not accommodated in the water level maintenance tank 280 and flows back to the buffer tank 110 through the partition wall W2. Therefore, the level of the black fluid in the water level holding tank 280 is maintained at the same height as the height of the boundary partition wall W2 with the buffer tank 110.

The water level maintenance pump 290 is for transporting the black fluid in the buffer tank 110 to the water level maintenance tank 280, it is configured to have a greater transport capacity than the transport force of the circulation pump 130. That is, when the transport capacity of the circulating pump 130 for transporting the black fluid in the level maintenance tank 280 is greater than the transport capacity of the level maintenance pump 290 for transporting the black fluid into the level maintenance tank 280, Since the water level in the maintenance pump 280 is lowered over time, in order to prevent this, the water level maintenance pump 290 is configured to transport more assay fluid than the circulation pump 130.

Therefore, according to the present embodiment, since the circulation pump 130 transports the black fluid in the water level holding tank 280 in which the water level is kept constant, the black fluid of the constant flow rate can be transported to the flow meter 140 side. According to this, the flow rate measurement accuracy through the flow meter 140 can be improved.

Next, a pump test system 300 to which the flowmeter verification system according to the present invention is applied will be described.

7 is a schematic illustration of a pump test system using the flow meter calibration system of the present invention.

Referring to FIG. 7, the pump test system 300 to which the flow meter verification system according to the present invention is applied includes a buffer tank 110, a black tank 120, a circulation pump 130, and a flow meter 140 to be tested. Fluid supply pipe 150, flow path conversion unit 160, flow control valve 170, water level holding tank 280, water level holding pump 290, test pump 310, storage tank 320 and the first flow The switch valve 330 and the second flow switching valve 340 is included.

However, the buffer tank 110, the black tank 120, the circulation pump 130, the flow meter 140, the fluid supply pipe 150, the flow path conversion unit 160, the flow control valve 170 and the water level maintenance of the present invention The tank 280 and the water level holding pump 290 are the same as those described above in the flowmeter verification system 100 and 200 according to the first or second embodiment of the present invention, and thus redundant description thereof will be omitted.

The test pump 310 is a pump to be tested, and in this operation description, the reactor coolant pump (RCP) is described as a test target pump 310, but is not limited thereto.

The storage tank 320 is a member for storing the assay fluid to be supplied to the test pump 310 in order to test the test pump 310 described above.

The first flow switching valve 330 is mounted on the fluid supply pipe 150 between the flow meter and the flow control valve, the flow path of the black fluid passing through the flow meter 140, the flow path conversion unit 160 or the storage tank ( 320 is a valve for converting the flow path to flow to any one of the selected side.

The second flow switching valve 340 is mounted between the circulation pump 130 and the water level maintenance pump 290, the transport force supplied from the stern ring pump 130, the water level maintenance tank 290 or the test pump 310 It is a member for converting the flow path to selectively supply to the assay fluid passed through any one of the) to be transferred to the flow meter 140 side.

Hereinafter, the pump test system 300 to which the flowmeter verification system according to the present invention is applied will be described.

As described in the flowmeter verification system of the first embodiment or the second embodiment, when the verification of the flowmeter 140 is completed, the first flow switching valve 330 is operated to convert the flow path of the assay fluid to change the flowmeter 140. The passing test fluid flows to the storage tank 320 side.

At the same time, the second fluid switching valve 340 is operated such that the black fluid passing through the test pump 310 instead of the water level holding tank 280 is transported to the flowmeter 140 through the circulation pump 130. To convert the flow path.

Therefore, according to the operation described above, the pump system 300 according to the present invention passes through the second flow switching valve 340 after the black fluid in the storage tank 320 passes the test pump 310, the circulation pump It is conveyed into the flow meter 140 by the 130. After the flow rate is measured by the flow meter 140, the assay fluid flows back into the storage tank 320 through the first flow switching valve 330, and the above procedure is repeated and the assay fluid is circulated.

Therefore, according to this invention, the performance of the test pump can be measured simultaneously, using the flowmeter with which the verification was completed and the reliability was ensured as it is.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention claimed in the claims, it is intended that any person skilled in the art to which the present invention pertains falls within the scope of the claims described in the present invention to various extents which can be modified.

100: flowmeter calibration system according to a first embodiment of the present invention
110: buffer tank 120: black tank
130: circulation pump 140: flow meter
150: fluid supply pipe 160: flow path conversion unit
170: flow control valve

Claims (7)

In a system for calibrating a flow meter,
A buffer tank in which the assay fluid is stored;
A calibration tank having a level gauge to measure the level of the assay fluid contained therein;
A circulation pump for transferring the assay fluid from the buffer tank to the flowmeter side;
A fluid supply pipe having one end connected to the flow meter;
The flow meter is connected to the other end of the fluid supply pipe and provided with the flow of the calibration fluid passed through the flow meter, and the flow rate of the flow of the calibration fluid measured by the flow meter is compared with the level of the calibration fluid in the calibration tank measured from the level gauge. And a flow path converting unit converting the flow path of the assay fluid toward the buffer tank side to the assay tank side for the test.
The flow path conversion unit,
It is installed so as to reciprocate between the assay tank and the buffer tank and is connected to an end provided with the assay fluid of the fluid supply pipe, and divided into two flow paths having a discharge port formed on either side of the buffer tank or the assay tank. Body part being; And a drive unit for reciprocating the body portion such that an end portion of the fluid supply pipe communicates with any one of the two flow path spaces partitioned in the body portion. The method of claim 1,
Receiving the supply of the assay fluid from the buffer tank, and further comprising a water level maintenance tank for maintaining a constant level of the assay fluid contained therein,
The circulation pump is a flow meter calibration system, characterized in that for conveying the assay fluid contained in the water level holding tank at a constant level to the flow meter side. The method of claim 2,
The buffer tank is disposed adjacent to the water level maintenance tank around the partition wall,
And a level maintenance pump for transferring the assay fluid in the buffer tank to the level maintenance tank. The method of claim 3,
And the flow rate of the assay fluid transferred into the level maintenance tank by the level maintenance pump is equal to or greater than the flow rate of the assay fluid transferred from the level maintenance tank to the flowmeter side by the circulation pump. The method of claim 4, wherein
And a flow control valve mounted on the fluid supply pipe so that the flow rate of the assay fluid flowing in the fluid supply pipe is controlled. Using the flow meter calibration system of any one of claims 2 to 5,
Storage tank;
A test pump connected to the storage tank;
A first flow switching valve provided on the fluid supply pipe and configured to switch the flow path of the assay fluid to the storage tank;
And a second flow switching valve provided on the flow path of the assay fluid between the water level holding tank and the circulation pump and switching the flow path so that the assay fluid discharged from the test pump flows to the circulation pump side. Featuring a pump test system. delete

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