JP5292522B1 - Ultrasonic flow measuring device - Google Patents

Abstract

An ultrasonic flow rate measuring device is easily attached to and detached from a tube through which a fluid to be measured flows, and the flow rate of the fluid is measured.
A holding body 2 is provided with a groove portion 1, and a pair of ultrasonic transmitters and receivers 5a and 5b are embedded in opposing inner wall surfaces of the groove portion 1. When the tubular body P is pushed into the groove portion 1 and tightened so that the groove portion 1 is narrowed by the latching arm, a part of the tubular body P is substantially in close contact with the inner wall surface of the groove portion 1 and the width of the groove portion 1 becomes a predetermined interval. When the ultrasonic beam B is transmitted into the fluid in the pipe P from one of the ultrasonic transmitters / receivers 5a and 5b when measuring the flow rate, the ultrasonic beam B that has passed through the fluid in the pipe P is transmitted from the transmitter / receiver 5a and 5b. Received on the other. The flow velocity is obtained by obtaining the propagation time difference between the forward time from the upstream side to the downstream side of the ultrasonic beam B and the backward time from the downstream side to the upstream side.
[Selection] Figure 4

Description

  The present invention relates to a clamp-on type ultrasonic flow measurement device that is attached to a tube body from the outside and propagates an ultrasonic beam to the fluid in the tube body to measure the flow rate of the fluid.

  As this type of apparatus, Patent Documents 1 and 2 filed by the present applicant are known.

Japanese Patent No. 4878653 Japanese Patent No. 4940384

  In the clamp-on-type ultrasonic flow measuring devices of Patent Documents 1 and 2, a tube mechanism made of lever is used to press a synthetic resin tube body from four directions by using a lever principle and a predetermined shape having a substantially square shape. Tightened to. Further, it is desirable to use at least a metal material for the main part, and it can be suitably used for a relatively large-diameter tube, but there is a problem that adaptation is difficult for a small-diameter tube. Furthermore, when attaching and detaching the ultrasonic flow measuring device to and from the tube, a large work space is required around the tube.

  An object of the present invention is to provide an ultrasonic flow measuring device that solves the above-described problems and can be attached to and detached from a tubular body with a simple structure and can reduce the work space. .

  In order to achieve the above object, an ultrasonic flow measuring device according to the present invention is an ultrasonic that allows a fluid to be measured to flow and a holding body to be detachably attached to a tube made of a flexible material. In the flow rate measuring apparatus, the holding body has a groove portion having inner wall surfaces on both sides and sandwiching the tube body, and is tightened so that the groove portion is narrowed by spanning the groove portion above the groove portion. A hook arm that makes the width of the groove portion a predetermined size by hooking, and attaching a pair of ultrasonic transmitters and receivers to the inner wall surface of the groove portion on the upstream side and the downstream side along the tubular body, An ultrasonic beam from the one ultrasonic transceiver is transmitted into the fluid of the tubular body, and an ultrasonic beam that has passed through the tubular body is received by the other ultrasonic transceiver. To do.

  According to the ultrasonic flow rate measuring apparatus according to the present invention, the configuration is simple and the tube body can be easily attached and detached.

It is a perspective view before use of the ultrasonic flow measuring device of Example 1. FIG. It is a top view in the state where an ultrasonic transceiver was embedded in a holding body. It is a perspective view in the state where a tubular body was installed. It is a principle explanatory view of an ultrasonic type flow measuring device. It is a perspective view of the ultrasonic type flow measuring device of Example 2. It is a perspective view of the state which locked the latching arm with the locking arm.

  The present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 is a perspective view of an ultrasonic flow measuring device according to a first embodiment before use, which is detachably attached to the outside of a tube body.

  It has a groove portion 1 having a U-shaped cross-section with the upper part opened, and is mainly made of a holding body 2 made of a synthetic resin material, and is made of a synthetic resin to be hooked on the opposite side across the groove portion 1 on both sides of the upper portion of the groove portion 1 The two latching arms 3a and 3b are provided.

  As shown in FIG. 2, a pair of ultrasonic transmitters / receivers 5 a and 5 b are respectively embedded in different positions along the longitudinal direction of the groove portion 1 on the inner wall surfaces 4 a and 4 b facing each other on both sides of the groove portion 1. The ultrasonic transmitters / receivers 5a and 5b are provided flush with the inner wall surfaces 4a and 4b of the groove portion 1 through a beam transmission body 6 made of synthetic resin. These ultrasonic transmitters / receivers 5a and 5b are connected to a circuit section to be described later via lead wires 7. The holding body 2 is composed of several parts, and the ultrasonic transceivers 5a and 5b are embedded by assembling these parts.

  The latch arms 3a and 3b are attached to the upper flat surfaces 8a and 8b of the upper portions of the inner wall surfaces 4a and 4b on both sides of the groove portion 1 respectively so as to be rotatable in the horizontal direction via the shaft portion 9. The latching claws 10 are provided at the tips of the latching arms 3a and 3b, respectively, and these latching claws 10 are provided on the opposite side surfaces of the opposing inner wall surfaces 4a and 4b on the opposite side surfaces thereof. Is provided so that the latching claw 10 is latched.

  That is, the latch arm 3a is fixed to the upper plane 8a on the inner wall surface 4a by the shaft portion 9, and the latch arm 3b is fixed to the upper plane 8b on the inner wall surface 4b by the shaft portion 9, and the latch arms 3a and 3b. Are spanned to the opposite inner wall surfaces 4b and 4a.

  The latch receiving portion 11 is formed in a slightly oblique direction with respect to the rotational directions of the latch arms 3a and 3b. By strongly pushing the latching claws 10 of the latching arms 3a and 3b into the latching receiving part 11, the groove part 1 in a state in which the tubular body is sandwiched between the latching arms 3a and 3b is tightened, and the inner wall surfaces 4a and 4b of the groove part 1 are tightened. The width between them is kept at a predetermined interval.

  FIG. 3 is a perspective view of a state in which the tubular body P is mounted when using the ultrasonic flow measuring device of the present embodiment. A tubular body P made of a synthetic material such as Teflon (registered trademark) for flowing fluid is pushed in along the longitudinal direction in the groove 1 of the holding body 2.

  In this case, the width of the groove portion 1 is often made smaller than the outer diameter of the tube body P, and the tube body P is deformed by the pushing of the tube body P, and the width of the groove portion 1 is often expanded. Subsequently, the latching arms 3a and 3b are looped around the groove portion 1 by pivoting about the shaft portion 9, and the latching claw 10 is latched on the latch receiving portion 11 and further pivoted. As a result, the inner wall surfaces 4a and 4b of the groove portion 1 are attracted to each other, the width of the expanded groove portion 1 is narrowed, and the tubular body P is pressed by the inner wall surfaces 4a and 4b of the groove portion 1, Closely contacts the inner wall surfaces 4a and 4b.

  The reason why a part of the tubular body P having a circular cross section is brought into close contact with the inner wall surfaces 4a and 4b and deformed into a plane is to bring the tubular body P into contact with the ultrasonic transceivers 5a and 5b, respectively. If the tubular body P remains circular, the ultrasonic transmitters / receivers 5a and 5b do not necessarily contact the outer surface of the circular tubular body P accurately. In addition, although both surfaces of the tubular body P in contact with the inner wall surfaces 4 a and 4 b of the groove portion 1 are flat, the tubular body P has an arc shape at the corner of the groove portion 1.

  If there is a large difference between the width of the groove 1 and the outer diameter of the tube P, when the tube P is sandwiched, the tube P is wrinkled or there is a gap between the inner wall surfaces 4a and 4b. Will occur. Therefore, it is necessary to select the size of the groove 1 based on the size of the pipe P to be used.

  FIG. 4 is an explanatory diagram at the time of flow rate measurement. The ultrasonic transceivers 5 a and 5 b are connected to the calculation control means 21, and the output of the calculation control means 21 is connected to the display means 22. In measuring the flow rate, the fluid F to be measured is caused to flow through the tube P, and from the ultrasonic transmitter / receiver 5a, 5b to the fluid F in the tube P via the beam transmission body 6 according to a signal from the calculation control means 21. An ultrasonic beam B is transmitted. This ultrasonic beam B passes through the fluid of the tube P, is received by the other of the ultrasonic transmitters / receivers 5a and 5b on the opposite side of the tube P, and is transmitted to the arithmetic control means 21.

  In this manner, transmission and reception of the ultrasonic beam B are alternately repeated by the ultrasonic transceivers 5a and 5b. In this case, the incident / exit of the ultrasonic beam B with respect to the tube P is performed on a flat surface of the tube P, and an ultrasonic beam B having a higher incident / exit efficiency than a circular tube is obtained.

  The arithmetic control means 21 averages the propagation time difference between the forward time when the ultrasonic beam B reaches the downstream side from the upstream side of the fluid F and the backward time when the ultrasonic beam B reaches the upstream side from the downstream side. Based on this propagation time difference, the calculation control means 21 calculates the flow velocity of the fluid F by a known method.

  The arithmetic control means 21 calculates the flow rate of the fluid F, and multiplies this flow rate by the internal cross-sectional area of the tube P to calculate the flow rate value. However, since the tube body P is deformed from a circular shape to a flat surface by the holding body 2, the cross-sectional area is often unknown. In this state, a predetermined flow rate is passed through the tube body P in advance for calibration. It is preferable to keep The obtained flow rate value is displayed on the display means 22.

  Actually, when the pipe body P starts to flow the fluid F, the pressure of the fluid F causes the pipe body P to further deform so as to contact the inner wall surfaces 4a and 4b of the groove portion 1, and the cross-sectional area of the pipe body P tends to increase. Therefore, an accurate flow rate is obtained after some time has passed since the fluid F started to flow.

  When the measurement is finished and the ultrasonic flow rate measuring device is detached from the tube P, the retaining arms 3a and 3b are removed and returned to the original state, and the tube P is taken out from the groove portion 1. Although two hook arms 3a and 3b are provided, this may be one.

  FIG. 5 is a perspective view of the ultrasonic flow measuring device according to the second embodiment. The second embodiment is further provided with synthetic resin locking arms 12a and 12b for preventing the latch arms 3a and 3b from being accidentally detached from the configuration of the first embodiment.

  That is, the shaft portion 9 is shared on the latch arms 3a and 3b, and the lock arms 12a and 12b made of synthetic resin are rotatably attached independently of the latch arms 3a and 3b. Yes. An L-shaped locking claw 13 that is bent downward is formed at the tip of each of the locking arms 12a and 12b.

  FIG. 6 is a perspective view of the locked state. After the pipe body P is attached to the groove 1 of the holding body 2 and the locking arms 3a and 3b are locked as in the first embodiment, the locking arms 12a and 12b are locked. And the side portions of the latching arms 3a and 3b in the latched state are locked by the locking claws 13. That is, the latch arm 3b is locked by the lock arm 12a, and the latch arm 3a is locked by the lock arm 12b. Thereby, the latching arms 3a and 3b are prevented from rotating in the non-latching direction, and will not be unintentionally detached unless the locking arms 12a and 12b are removed.

  In the first and second embodiments, the ultrasonic transceivers 5a and 5b are arranged on the inner wall surfaces 4a and 4b on both sides of the groove portion 1, respectively. However, when there is a margin in structure, a pair of ultrasonic transmitters / receivers 5a, 5b are arranged on the inner wall surface 4a or 4b on one side of the groove 1 and the ultrasonic beam B is reciprocated in the tube P. The ultrasonic beam B reflected in the tubular body P may be detected.

  In the first and second embodiments, the groove portion 1 with respect to the pipe body P has a U-shaped cross section. However, since the pipe body P only needs to be in close contact with the inner wall surfaces 4a and 4b, the shape of the groove portion 1 is U-shaped. It can also be a mold or the like.

  Moreover, although the holding body 2, the latching arms 3a and 3b, and the locking arms 12a and 12b are made of a synthetic resin material in the embodiment, all or a part of them can be made of metal.

DESCRIPTION OF SYMBOLS 1 Groove part 2 Holding body 3a, 3b Latching arm 4a, 4b Inner wall surface 5a, 5b Ultrasonic transmitter / receiver 6 Beam transmission body 7 Lead wire 9 Shaft part 10 Latching claw 11 Latching receiving part 12a, 12b Locking arm 13 Locking Claw 21 Arithmetic control means 22 Display means F Fluid P Tube

Claims (8)

  In an ultrasonic flow measuring device in which a holding body is detachably attached to a tubular body made of a flexible material through which a fluid to be measured flows, the holding body has inner wall surfaces on both sides, and A latching arm having a groove for sandwiching a tubular body, spanning the groove above the groove and tightening and tightening the groove so that the width of the groove is narrowed. A pair of ultrasonic transmitters / receivers are attached to the inner wall surface of the groove on the upstream side and the downstream side along the tube, and the ultrasonic beam from the one ultrasonic transmitter / receiver in the fluid of the tube And an ultrasonic beam passing through the tubular body is received by the other ultrasonic transmitter / receiver.   2. The ultrasonic flow rate measuring device according to claim 1, wherein a hooking claw is provided at a tip of the hooking arm, and the hook is received by a hooking receiving portion provided in a part of the holding body.   The ultrasonic flow rate measuring apparatus according to claim 1, wherein a width of the groove is smaller than an outer diameter of the tubular body.   The ultrasonic flow rate measuring apparatus according to claim 1, wherein the groove has a U-shaped cross section.   The ultrasonic flow rate measuring device according to any one of claims 1 to 4, wherein the pair of ultrasonic transceivers are arranged on the inner wall surface on one side of the groove.   The ultrasonic flow rate measuring apparatus according to any one of claims 1 to 4, wherein the pair of ultrasonic transmitters / receivers are respectively disposed on the inner wall surfaces on both sides of the groove portion.   The latching arms are two first and second latching arms, spanning the first latching arm from the first inner wall surface side of the groove to the second inner wall surface side, The ultrasonic flow rate measuring apparatus according to any one of claims 1 to 6, wherein the second hooking arm is hung from the second inner wall surface side of the groove portion to the first inner wall surface side.   First and second locking arms that share a shaft portion on the first and second locking arms and rotate independently of each of the locking arms to form locking claws at the tips are provided. The side of the second latching arm in the latched state is locked by the rotation of the first locking arm, and the first in the latched state by the rotation of the second latching arm. The ultrasonic flow rate measuring device according to claim 7, wherein a side portion of the latch arm is locked.

Images