JP2651299B2 - Insertion type sensor attachment / detachment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insertion / detachment device for an insertion type sensor, and more particularly, to a structure of an insertion / detachment type attachment / detachment device which can be operated at a low position without removing a sensor for detecting a physical quantity of a fluid to be measured from a flow tube. About.

[0002]

2. Description of the Related Art In order to easily measure a physical quantity such as a density, a viscosity, or a flow rate of a fluid to be measured, a sensor is inserted into a flow tube, and an insertion type sensor that measures the physical quantity based on an output of the sensor is known. Have been. These insertion type sensors are mounted with a specification structure according to the conditions of the temperature or pressure of the fluid, but it is necessary to remove the inserted sensors from the flow tube in repair inspection of these sensors and the like. When the sensor is removed from the flow tube, a valve device such as a ball valve is interposed between the flow path and the sensor drive device so that the fluid to be measured does not flow out of the flow tube, and the flow is measured through the valve device. It is common to do this after blocking the road. In particular, when the temperature or pressure of the fluid is high, or when the flow path cannot be closed for a long period of time, the means for removing via the valve device is an indispensable mechanism.

FIGS. 2A and 2B are views for explaining the structure of a conventional insertion-type sensor attaching / detaching device. FIG. 2A is a side sectional view, and FIG. FIG. 3 is a front view of the apparatus, in which 30 is a flow tube, 31 is a ball valve, 32 is a mounting cylinder, 33
Is a support plate, 34 is a seal material, 35 is a seal cap, 3
6 is a support, 37 is a fixing plate, 38 is a nut, 39 is a handle, 40 is a sensor, 41 is a support cylinder, 42 is a converter, 43
Is a guide plate, and 44 is a screw rod.

[0004] In the drawing, an outlet pipe 3 provided with an axis in a direction perpendicular to the axis of the flow pipe 30 and opened is provided on the flow pipe 30.
0a flange 30b and ball valve 31 flange 31
and a mounting cylinder 32 is connected in series to another flange 31b of the ball valve 31 by a flange 32a. A support plate 33 is fixed to the other end surface of the mounting cylinder 32, and the inside of the mounting cylinder 33 forms a hollow passage 32 b communicating with the flow pipe 30 by opening the ball valve 31. One end of a plurality of columns 36 is fixed to the vicinity of the outer periphery of the support plate 33 by welding or the like, and a fixing plate 37 to which a handle 39 is rotatably fixed is fixed to the other end of the column 36 by a nut 38 or the like. I have.

At the center of the plurality of columns 36, a handle 3 is provided.
A screw rod 44 screwed with the screw 9 is provided. The screw rod 44 has a guide plate 43 for guiding the column 36 so as to be able to move vertically using the support column 36 as a guide rod, and a converter 42 is fixed to the lower surface of the guide plate 43. A support tube 41 is provided, and a sensor 40 is attached to an end of the support tube 41. The guide plate 43, the converter 42, the support tube 41, and the sensor 40 are integrally formed. A lead wire (not shown) of the sensor 40 is inserted through the inside of the support cylinder 41 and connected to the converter 42. The support cylinder 41 is coaxially connected to the screw rod 44, and is liquid-sealed with the support plate 33 by a sealant 34 and sealed by a seal cap 35.

In the state shown in FIG. 2A, the sensor 40 is connected to the flow tube 3.
FIG. 3 is a view showing that the ball valve 31 is being inserted and is being measured, and the ball valve 31 is opened, and the sensor 40 fixed to the end of the support cylinder 41 is shown inserted through a through hole of a valve body (not shown). It is located at the position. The liquid to be measured is sealed by the sealing material 34,
It will not be leaked outside. At this time, the converter 4
2 is at the solid line position.

When removing the sensor 40, first, the handle 39 is driven to rotate and the screw rod 44 is moved upward.
By this movement, the sensor 40 moves up to the position indicated by the dotted line of the mounting cylinder 32. At this time, the converter 42 also moves to the dotted line position. Next, the ball valve 31 is closed and the fluid to be measured and the sensor 4 are closed.
Then, the flow path to the zero is shut off, the flange 32a is unjoined, and the upper part is removed. In the above operation, the sensor 40
Is a long stroke from the solid line position to the dotted line position. Accordingly, the column 36 is also long, and the position of the handle 39 provided on the upper portion thereof is further increased, and the operation of the handle becomes a high place operation, which is inconvenient and dangerous.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an insertion-type sensor attaching / detaching device capable of easily and safely operating a handle at a low position.

[0009]

To achieve the above object, the present invention provides (1)
A flow pipe through which the fluid to be measured flows, a flow path opened crossing the flow pipe axis, and valve means disposed outside the flow pipe; and a valve means moving on the flow path axis of the valve means. A sensor for detecting a physical quantity of the fluid that can be attached and detached by opening and closing the valve; and a driving means disposed on a flow path axis of the valve means for moving the sensor on the flow path axis. The means is an internal gear that is driven to rotate about the flow path axis, a planet gear that meshes with the internal gear and rotates about a fixed position axis, and is fixed to the planet gear shaft extending on the axis of the planet gear. A driving screw and a lifting table which is screwed to the driving screw, moves coaxially, and fixes the sensor and a support cylinder and a converter of the sensor.
(2) In the above (1), a support means for pressing a sensor or a support cylinder for fixing the sensor is interposed between a flange connecting the flow tube and the valve means, and the support means is provided at the center. It is characterized in that a through hole is provided, and a plate-shaped body having a cross section around the opening formed by a tapered surface, and a tapered surface that is in surface contact with the tapered surface formed in the plate-shaped body around the sensor or the support cylinder. It is assumed that.

FIGS. 1A and 1B are views for explaining an embodiment of an insertion type sensor attaching / detaching apparatus according to the present invention.
FIG. 1A is a side sectional view, and FIG.
FIG. 2 is a sectional view taken along line A, in which 1 is a flow tube, 2 is an insertion tube, 2a
Is a mounting flange, 3 is a ball valve, 4 is a sensor holding part, 5 is a mounting cylinder, 6 is a sensor, 7 is a supporting cylinder, 8 is a base,
9 is an internal gear, 9a is a handle, 11 is a holding cover, 12 is a spacer, 13 is a support, 14 is a driving screw, 15 is a lifting platform, 16 is a guide cylinder, 17 is a support plate, 18 is a converter, 19
Denotes a connector, 20 denotes a sealing material, and 21 denotes a case.

In the drawing, an insertion tube 2 having an axis substantially perpendicular to the axis of the flow tube 1 is opened in the flow tube 1, and a sensor 6 is provided. At the top of the insertion tube 2 is a mounting flange 2
The ball valve 3, the mounting cylinder 5, and the drive device 22 are connected and fixed in series via the flanges 3a, 3b, 5a and the like in this order. As a result, a hollow path is formed between the mounting cylinder 5 and the flow tube 1 and is filled with the liquid to be measured, and the sensor 6 can move up and down in the hollow path. Sensor 6 during measurement
Is a state in which the ball valve 3 is opened, partially inserted into the flow tube 1 and is in the fluid to be measured and is being measured, and is integrally fixed to the support cylinder 7 and the converter 18.

The drive unit 22 is provided on the base 8 fixed to the mounting cylinder 5. The base 8 has a through hole in the center of which a sealing material 20 for penetrating the support cylinder 7 in a liquid-tight manner is provided. The sealing material 20 is pressed by a guide cylinder 16, and the guide cylinder 16 is The support cylinder 7 is fixed on the base 8 by
To guide the up and down movement. An internal gear 9 having an outer diameter substantially coincident with the outer peripheral portion is provided on the base 8, and a minute gap is provided by a holding lid 11 provided at an interval determined by a spacer 12. It is rotatable. Handle 9a
Is for rotating the internal gear 9.

Two planetary gears 10, 10 arranged on the diameter mesh with the internal gear 9, and the planetary gears 10, 10 are engaged with each other.
A drive screw 14 is fixed through the shaft 10 in parallel, and both ends of the drive screw 14 are rotatably mounted on bearings 14a, 14a.
14b. The bearing 14 a is fixed on a support plate 17 fixed to the upper surface of the base 8 by a plurality of columns 13, and the bearing 14 b is embedded in the base 8. On the other hand, an elevating table 15 is screwed with the driving screws 14 and 14 and moves up and down by rotation of the driving screws 14. The elevating table 15 is provided with a mounting table 15a for fixing the converter 18 so as to cover the guide cylinder 16, and is fixed to the support cylinder 7 by fixing screws 15b. The converter 18 is fixed to the mounting base 15a via a converter base 18a. A lead wire 19 a between the converter 18 and the sensor 6 is detachably connected by a connector 19 and inserted into the support cylinder 7.

Next, the operation of the insertion type sensor attaching / detaching device of the present invention having the above-described structure will be described. Sensor 6 in the state shown
When removing the case, first remove the case 21 and handle 9
By rotating “a” and transmitting the rotation to the planetary gears 10, 10, the sensor 6 moves together with the elevator 15 to reach the position indicated by the dotted line. At the same time, the elevator 15 also moves to the dotted line position, and the converter 18
The converter 18 can be removed by passing through the through hole 17 provided in the support plate 17 and removing the connector 19 at a position protruding outside. Further, the ball valve 3 is set at a position where the handle 9a is turned and the lift 15 is raised.
Is closed, the mounting cylinder 5 is removed, and the sensor 6 can be easily inspected. Although the on-off valve has been described as the ball valve 3, it need not be a ball valve.

When the sensor 6 is inserted, the ball valve 3 is opened by the reverse operation described above, and can be returned to the position indicated by the solid line in the figure by turning the handle 9a. A sensor holding member 4 is interposed between the sensor holding members 4. The sensor holding member 4 is for holding the sensor 6 in a double-supporting manner. The sensor 6 can be stably held by making surface contact with the tapered surface 4a and the holding ring 6a provided on the sensor 6. Further, since the sensor holding member 4 is made of a flexible material, the sensor 6 is not damaged even if there is a slight displacement.

[0016]

As apparent from the above description, the present invention has the following effects. (1) Effect corresponding to the first aspect: By rotating the internal gear by the handle, the sensor is moved up and down via the planetary gear which is engaged with and rotated by the internal gear.
The handle position can be lowered, and the operation is easy and safe. Also, repair and inspection of sensors, converters, and the like are facilitated. Further, since the converter is arranged in the driving device during the measurement, the converter is always housed in the case, so that the converter is hardly affected by the external environment and the reliability is increased. (2) Effect corresponding to claim 2: Since the sensor is supported by the sensor holding member having the tapered surface and the guide tube, vibration due to the flow of fluid can be eliminated during measurement. In addition, since the sensor holding member is made of a flexible material such as a resin material such as Teflon, the sensor can be prevented from being damaged, and the amount of movement can be increased.

[Brief description of the drawings]

FIG. 1 is a view for explaining one embodiment of an insertion type sensor attaching / detaching device of the present invention.

FIG. 2 is a view for explaining the structure of a conventional insertion-type sensor attaching / detaching device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flow pipe, 2 ... Insertion pipe, 2a ... Mounting flange, 3 ... Ball valve, 4 ... Sensor holding member, 5 ... Mounting cylinder, 6 ... Sensor, 7 ... Support cylinder, 8 ... Base, 9 ... Internal gear , 9a: handle, 11: lid, 12: spacer, 13: support, 1
4 ... Drive screw, 15 ... Elevating table, 16 ... Guide cylinder, 17 ... Support plate, 18 ... Converter, 19 ... Connector, 20 ... Seal material, 21 ... Case.

Claims (2)

(57) [Claims] 1. A flow pipe through which a fluid to be measured flows, a flow path opened intersecting with the flow pipe axis, and valve means disposed outside the flow pipe; A sensor that detects the physical quantity of the fluid that can be removed by opening and closing the valve means, and a driving means that is disposed on the flow path axis of the valve means and moves the sensor onto the flow path axis. An internal gear that is driven to rotate about the flow path axis, a planetary gear that meshes with the internal gear and rotates about a fixed position axis, and a planetary gear that extends on the axis of the planetary gear. A drive screw fixed to the gear shaft, and an elevating table screwed to the drive screw and moved coaxially to fix the sensor, a support cylinder of the sensor and a converter. Shape sensor attachment / detachment device. 2. A support means for pressing a sensor or a support cylinder for fixing the sensor between flanges connecting the flow pipe and the valve means, the support means having a through hole in the center, and an opening 2. A plate-like body having a peripheral cross section formed by a tapered surface, and a tapered surface that is in surface contact with a tapered surface formed on the plate-shaped body around the sensor or the support cylinder. Insertion type sensor attachment / detachment device.