JPS5912565Y2 - turbine meter - Google Patents

Description

[Detailed description of the invention] The present invention relates to a turbine meter, and has a structure capable of supplying cleaning check fluid in addition to cleaning fluid to a cleaning device that cleans an impeller and the sliding contact portion of the impeller. It is an object of the present invention to provide a turbine meter configured to quantitatively grasp the cleaning effect by using the rotational speed of an impeller caused by a cleaning check fluid as a barometer.

Generally, an impeller is rotatably supported in the flow path of the fluid to be measured.
A turbine meter is known that measures the flow rate of a fluid to be measured from the rotational speed of the impeller.

When this type of turbine meter is used for a long time, viscous substances contained in the measured fluid gradually accumulate on the impeller surface, the inner wall of the outer shell of the meter, the impeller support, and other rotational sliding contact parts. This accumulated viscous substance comes into contact with the impeller, and in turn provides resistance to the rotation of the impeller.

As a result, the instrumental error characteristics deteriorate, and in extreme cases, the impeller may not be able to rotate.

For this reason, conventional turbine meters have been known to have a strainer, oil separator, etc. interposed in the upstream piping to remove viscous substances. When natural gas contains a large amount of dust, strainers etc. quickly become clogged, making it impossible to put them into practical use.

In addition, so-called insertion type turbine meters are known, in which a small turbine meter is inserted into the exhaust gas flue of a boiler to measure the flow rate of exhaust gas in the flue, but usually a strainer or oil separator is installed in the flue. Since this is not provided, viscous substances such as oil mist and tar contained in the exhaust gas are deposited on the meter outer shell, the impeller shaft bearing, etc., resulting in the same disadvantages as described above.

In order to address these drawbacks of conventional devices, the present applicant previously applied for a patent application in 1973.
No. 1-115673, a turbine meter equipped with a cleaning device has been proposed, which is equipped with a cleaning device that injects cleaning fluid to locations that impede the rotation of the impeller.

However, with this product, if it becomes necessary to check the cleaning effect of the cleaning fluid, it is necessary to remove the outer shell of the menu and visually check the state of dirt, which requires troublesome disassembly and assembly. There were problems such as the need to carry out work.

The present invention eliminates the above drawbacks and solves the problems, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the turbine meter according to the present invention applied to an insertion type turbine meter, and FIG. 2 is an enlarged view of the main parts thereof.

In FIG. 1, a turbine meter 1 is constructed by attaching a cylindrical meter outer shell 3 to the tip of an insertion tube 2. In this embodiment, for example, a large-diameter tube such as a flue for exhaust gas of a boiler is used. It is inserted in 4.

At the center of the meter shell 3 is a shaft support 5 as shown in FIG.
is supported by a support arm 6, and an impeller 8 is rotatably supported on a shaft 7 protruding from the shaft support portion 5.

The impeller 8 has a plurality of blades 9 made of a magnetic material attached to a body 10.
They are installed on the circumferential surface of each of the cylinders in a state of being twisted at a predetermined angle in the axial direction.

The impeller body 10 is fitted to the shaft 7 with a gap 11 of a predetermined size in the radial direction, and between the locking part 12 and the shaft support part 5 which face each other at the front and rear of the body 10. A gap 13, 14 of a predetermined size is formed in each case in the axial direction.

These radial gaps 11 and axial gaps 13, 14 are supplied with bearing fluid from the outside, forming a fluid radial bearing and a fluid thrust bearing, respectively.

For example, air is used as the bearing fluid, and a hole L15 is bored in the shaft 7 and the shaft support portion 5 to serve as a flow path for the bearing air.

Further, in this embodiment, the shaft 7 is provided with a plurality of communication holes 16 at two locations, and the radial gap 11 communicates with the hole 15 through the communication holes 16 .

Here, bearing air is supplied from an external air source 20 to a pipe 21 in the insertion tube 2 via a pipe 19 provided with a filter 17, a pressure reducing valve 18, etc., and is further supplied into {L15 by a pipe 22, The radial gap 11 and the axial gap 13.14 are supplied via the communication hole 16.

Therefore, the impeller 8 rotates in a non-contact state in the radial and axial directions, that is, in a floating state, so that its mechanical rotational reaction torque is small and it rotates smoothly even in a low flow rate range.

A part of the fluid to be measured flowing through the large-diameter pipe 4 flows inside the meter shell 3, causing the impeller 8 to rotate at a rotational speed corresponding to the flow velocity of the fluid to be measured.

The rotation of the impeller 8 is measured by a pickup coil 23 embedded in the meter outer shell 3, and each time the impeller 9 passes near the pickup coil 23, a pulse voltage induced by electromagnetic induction is generated inside the insertion tube 2. lead wire 24
The signal is transmitted to the preamplifier section 25 by.

In addition to the electromagnetic type described above, the pickup coil 23 uses a high-frequency oscillation coil, for example, which modulates a high-frequency signal according to the rotation of the impeller 8, and detects, amplifies, and shapes this modulated signal to adjust the rotation speed of the impeller 8. It can also be configured to detect.

The cleaning device 26 is constructed by holding a nozzle member 28 fixedly attached to the lower end of the supply pipe 27 on the downstream side of the shaft support 5 so as to face the shaft support 5 with a predetermined distance therebetween.

The nozzle member 28 has an annular nozzle nozzle 29 , which is connected to a cleaning fluid supply source 31 via a supply pipe 27 and a supply pipe 30 .

In the case of this embodiment, the supply tube 27 is inserted through the insertion tube 2, and is connected to the supply tube 30 at the end of the insertion tube 2.

The shape of the opening of the nozzle roller 29 is such that a part of the fluid injected from the nozzle roller 29 flows upstream along the surface of the shaft support part 5, and the other part flows to the tip of the blade 9 of the impeller 8. It has a shape that seems to flow towards it.

Here, the cleaning fluid is used depending on the type of sticky substance and the type of fluid to be measured. For example, if the sticky substance is tar, a solvent, hot water, soapy water, etc. If the fluid is natural gas, the same type of natural gas or steam may be used.

Reference numeral 32 denotes a switching valve that controls the main part of the present invention, and is provided in the cleaning fluid supply pipe 30. By switching the valve part, one of the two inlet ports 33 and 34 is connected to the outflow port. It can be connected to the side port 35.

Here, the port 33 is connected to the cleaning fluid supply source 31 via an on-off valve 36, and the port 34 is connected to the air pipe 19 via a pipe 37.

Therefore, by switching the switching valve 32, the cleaning device 2
6 can be supplied with air from an air source 20.

Here, after inserting and installing the turbine meter 1 into the large-diameter pipe 4, and before starting actual measurement, the switching valve 32 is operated to supply air at a constant pressure from the cleaning device 26 to the impeller 8. The number of rotations of the impeller 8 due to this air flow is measured in advance as a barometer of dirt during a cleaning check, which will be described later.

The operations for cleaning and confirmation of the cleaning effect, which are the main parts of the present invention, will be explained below.

As the usage time of the turbine meter 1 increases, sticky substances contained in the measured fluid adhere and accumulate on various parts of the meter outer shell 3, and if left as is, the sticky substance deposits will come into contact with the impeller 8 and cause damage to the impeller 8. There is a possibility that the wheel 8 will not be able to rotate normally.

In this case, first open the on-off valve 36, and then open the cleaning fluid supply source 3.
One cleaning fluid is supplied to the cleaning device 26 via the switching valve 32 and is injected from the nozzle hole 29 of the nozzle member 28.

As a result, a part of the cleaning fluid injected from the nozzle roller 29 flows along the surface of the shaft support part 5 and is deposited on the base of the blades 9 of the impeller 8 or the opening of the axial gap 13, 14, etc. Wash off dirt such as sticky substances.

In this case, since bearing air was constantly supplied into the axial gaps 13 and 14, there was relatively little dirt.

Further, a part of the cleaning fluid is sprayed into the gap between the tip of the blade 9 of the impeller 8 and the inner wall of the meter shell 3, and the sticky substance that adheres and accumulates on the inner wall and blocks the gap is removed. Wash off dirt such as.

After cleaning with the cleaning fluid for a certain period of time, the effectiveness of the cleaning is then checked.

First, the switching valve 32 is switched, the ports 34 and 35 are connected to each other, and the air source 2 is connected to the cleaning fluid supply pipe 30.
Supply air at a constant pressure from 0.

As a result, the air injected from the nozzle hole 29 of the nozzle member 28 collides with the impeller 8 from the downstream side, and the impeller 8
is rotated at an appropriate rotation speed.

The rotational speed of the impeller 8 at this time is a barometer of the dirt in the cleaned area, and if the rotational speed at this time is extremely small compared to the rotational speed measured before the dirt was attached, It can be seen that dirt still remains, and if there is almost no difference between the two rotational speeds, it can be seen that the dirt has been successfully washed off.

In this way, the turbine meter 1 can very easily determine the degree of dirt removed by cleaning from the rotational speed of the impeller 8, and if the impeller 8 is not rotating smoothly after cleaning, , switch the switching valve 32, and switch the cleaning device 2.
6 can be supplied with cleaning fluid again to repeat the cleaning.

Therefore, it is possible to continue cleaning until it is clear that the dirt has completely removed, and unlike conventional methods, measurements are taken even though the cleaning has no effect at all, making accurate measurements impossible. No inconvenience will occur.

In the above embodiment, the tube 21 for supplying bearing air is provided inside the insertion tube 2, but as in the turbine meter 41 shown in FIG. It may also be used as an air conduit.

In the case of this embodiment, the purge fluid supply pipe 27 is also provided outside the insertion tube 2, but the structure of the cleaning device 26, the switching valve 32, etc. is generally the same as in the previous embodiment.

In FIG. 3, the same structures or parts as in FIG. 1 are given the same reference numerals.

FIG. 4 shows a schematic vertical sectional view of an embodiment of the turbine meter according to the present invention applied to a full-bore turbine meter.

In the case of this embodiment, the meter outer shell 52 of the turbine meter 51
is directly connected to the piping 53 of the fluid to be measured, and all the fluid to be measured flowing through the piping 53 flows inside the meter outer shell 52.

The cleaning device 54 is constructed such that a nozzle member 55 having two nozzle holes faces the impeller 80 downstream of the blades 9 with a predetermined distance from the blades 9.

One nozzle rod 56 of the nozzle member 55 is directed toward the tip of the blade 9 and the inner wall of the meter shell 52 at the portion opposite thereto, and the other nozzle rod 57 is directed toward the base of the blade 9 of the impeller 8. It is directed towards.

In the case of this embodiment, as in each of the above embodiments, the cleaning fluid supply pipe 3
A switching valve 32 is provided in the 0.

In the above embodiments, a sliding bearing, a rolling bearing, or the like may be used instead of the hydrostatic fluid bearing.

For example, when a sliding bearing is used as in the turbine meter 71 shown in FIG. They are provided one by one.

In the case of this embodiment, the switching valve 32 is provided in the supply pipe 30 that supplies cleaning fluid to the cleaning device 54 on the downstream side, and air for cleaning check is injected from the cleaning device 54 on the downstream side. However, it is also possible to provide a configuration in which the switching valve 32 is provided in the other supply pipe 72 and air for cleaning check is injected from the cleaning device 54 on the upstream side.

In each of the embodiments described above, the cleaning with the cleaning fluid and the check of the cleaning effect may be repeated repeatedly until dirt no longer interferes with the rotation of the impeller 8.

Further, in each of the above embodiments, the cleaning check fluid is not limited to air, but may be other gases, or may be liquid instead of gas.

As mentioned above, the turbine meter according to the present invention has a structure in which the cleaning device that supplies cleaning fluid to the area to be cleaned inside the meter outer shell is connected to the cleaning check fluid source via the switching valve. After cleaning the meter outer shell or impeller, etc. with the cleaning fluid from the cleaning fluid supply source, the switching valve is switched to supply cleaning check fluid from the cleaning device into the meter outer shell. The degree of dirt or dirt removal can be quantitatively checked by using the rotation speed of the impeller based on the flow as a dirt barometer. By comparing the number of rotations with the number of rotations after cleaning, the degree of dirt can be determined very easily, and after confirming that the dirt has been thoroughly removed by washing, the actual measurement can be started. In addition, as the cleaning check fluid, for example, air for an air bearing for rotating the impeller in a floating manner can be used, and even if a separate cleaning check fluid source is provided, the cleaning check fluid piping can be connected to a switching valve. Since it is only necessary to connect to the cleaning fluid supply source through the .

[Brief Description of the Drawings] Fig. 1 is a schematic vertical cross-sectional view of one embodiment of the turbine meter according to the present invention applied to an insertion type turbine meter;
The figure is an enlarged view of the main part of Fig. 1, Fig. 3 is a schematic vertical cross-sectional view of a modification of the above turbine meter, and Fig. 4 is an example of the case where the turbine meter of the present invention is applied to a full-bore turbine meter. FIG. 5 is a schematic longitudinal sectional view of a modified example of the turbine meter. 1,41,51. 71... Turbine meter, 3, 52... Meter outer shell, 8... Impeller, 20... Air source, 26... Cleaning device, 27, 30... Supply pipe, 31...
- Cleaning fluid supply source, 32... switching valve.

Claims (1)

[Scope of utility model registration request] An impeller rotatably supported within the meter outer shell, a cleaning device that supplies cleaning fluid from an external cleaning fluid supply source to the impeller, and a switching valve connected to the cleaning fluid supply pipe. A cleaning check fluid source is connected to the cleaning check fluid source, and the switching valve is switched after cleaning is completed to supply the cleaning check fluid from the cleaning device to the impeller to rotate the impeller, and the rotation speed of the impeller is detected. A turbine meter consisting of a detector.