JP5608064B2 - Ultrasonic transducer fitting and ultrasonic fluid measuring device - Google Patents

Description

  The present invention relates to an ultrasonic transducer fixture and an ultrasonic fluid measuring device. More specifically, the present invention relates to an apparatus for measuring a flow rate of a fluid using ultrasonic waves and an ultrasonic transducer mounting tool used therefor.

  Patent Document 1 discloses an ultrasonic flow rate measuring apparatus that measures the flow velocity of a gas or a liquid using ultrasonic waves. This device is capable of transmitting and receiving ultrasonic pulses with short reverberation and aims to reduce the propagation of vibrations to the pipe wall. This apparatus is provided with an ultrasonic transducer having a support portion provided outside the side wall portion and a piezoelectric body fixed to a wall surface without a ceiling portion. Moreover, the vibration transmission suppression body which has the damping part which reduces the vibration of a side wall part, and the clamping part which can hold | maintain a support part is provided.

JP 2001-159551 A

  An object of the present invention is to provide an ultrasonic transducer mounting tool and an ultrasonic fluid measuring device capable of simplifying the operation of mounting an ultrasonic transducer on a tube wall.

  In the ultrasonic fluid measuring apparatus, the present inventors have intensively studied in order to simplify the operation of attaching the ultrasonic transducer to the wall (tube wall) of the tube through which the fluid to be measured flows. Furthermore, in order to more effectively suppress the propagation of vibration from the ultrasonic transducer to the tube wall or from the tube wall to the ultrasonic transducer, intensive studies were conducted. As a result, the following knowledge was obtained.

  When the ultrasonic transducer is screwed to the tube wall using a screw or the like, the installation process is complicated and it takes time. In addition, when the ultrasonic transducer transmits or receives ultrasonic waves, vibration is transmitted from the ultrasonic transducer to the tube wall or from the tube wall to the ultrasonic transducer via the fixture. There may be a problem of noise when receiving an ultrasonic signal.

  On the other hand, in a fluid measuring device such as a flow meter using an ultrasonic transducer, a tube attached with the ultrasonic transducer is disposed as a whole (with the ultrasonic transducer) in a fluid-filled chamber. A configuration can also be adopted. In such a configuration, there is no need to strictly seal between the tube wall and the ultrasonic transducer. Therefore, it is not always necessary to attach the ultrasonic transducer to the tube wall using strong fastening means such as screwing.

  Also, attaching the ultrasonic transducer to the tube wall by a less powerful fixing means is effective in reducing the transmission rate of vibration between the ultrasonic transducer and the tube wall. Since a less powerful fixing means can be used, it is possible to employ a configuration in which, for example, an island-shaped protrusion is brought into contact with the tube wall or the ultrasonic transducer. In such a configuration, the contact area between the tube wall and the fixture, or the contact area between the fixture and the ultrasonic transducer can be reduced, and the transmission rate of vibration between the ultrasonic transducer and the tube wall can be reduced. Can be further reduced.

  Based on the above knowledge, the present inventors have attached the ultrasonic transducer attachment device with an elastic body such as rubber so as to sandwich the flange of the ultrasonic transducer and the edge of the hole provided in the tube wall. It was conceived that the construction work of the ultrasonic transducer on the tube wall can be simplified by configuring the above.

  Further, an island-shaped protrusion is provided on at least one of the sandwiching portions, and the protrusion is configured so that the attachment comes into contact with at least one of the flange and the tube wall, thereby providing a space between the ultrasonic transducer and the tube wall. The inventors have conceived that the transmission rate of vibration can be further reduced.

  That is, the ultrasonic transducer attachment of the present invention is an ultrasonic transducer attachment for attaching an ultrasonic transducer having a case with a flange to a hole provided in a tube wall of an ultrasonic fluid measuring device. A first sandwiching portion that is made of an elastic body and that clamps the flange to fix the ultrasonic transducer to the ultrasonic transducer fixture, and clamps the edge of the hole And a second clamping part for fixing the ultrasonic transducer mounting tool to the tube wall.

  With this configuration, it is possible to simplify the work of attaching the ultrasonic transducer to the tube wall.

  In the ultrasonic transducer attachment, at least one of the first clamping part and the second clamping part is provided with an island-shaped projection, and the projection allows the ultrasonic transducer fitting to be connected to the flange and the tube. You may contact | abut at least one of the walls.

  With such a configuration, it is possible to effectively suppress the propagation of vibration from the ultrasonic transducer to the tube wall or from the tube wall to the ultrasonic transducer.

  In the ultrasonic transducer mounting device, the first clamping part and the second clamping part are separated from each other in the thickness direction because they are not in the same plane in the thickness direction of the tube wall constituting the edge of the hole. It may be configured as follows.

  With such a configuration, it is possible to effectively suppress the propagation of vibration from the ultrasonic transducer to the tube wall or from the tube wall to the ultrasonic transducer.

  The ultrasonic transducer fixture may be constituted by a single member.

  With this configuration, it is possible to further simplify the work of attaching the ultrasonic transducer to the tube wall.

  The ultrasonic transducer fixture may include a contact portion that contacts a portion of the case other than the flange.

  In this configuration, the ultrasonic transducer is more stably held by the ultrasonic transducer fixture.

  Moreover, the ultrasonic fluid measuring device of the present invention includes the ultrasonic transducer attachment device, the ultrasonic transducer, and the tube wall.

  With such a configuration, the assembly work of the ultrasonic fluid measuring device can be simplified.

  The ultrasonic fluid measuring device includes a housing having a chamber, the ultrasonic transducer fixture, the ultrasonic transducer and the tube wall are provided inside the chamber, and the tube wall is A gas inflow port and a gas outflow port are formed in the housing so that the chamber communicates with the outside, and a flow path formed by the tube wall is the gas inflow port. And any one of the gas outlets.

  In such a configuration, the fluid can be accurately measured regardless of the sealing property of the ultrasonic transducer fixture.

  According to the ultrasonic transducer attachment and the ultrasonic fluid measuring device of the present invention, the operation of attaching the ultrasonic transducer to the tube wall can be simplified.

FIG. 1 is a diagram illustrating an example of a schematic configuration of an ultrasonic transducer mounting fixture according to an example of the first embodiment, and FIG. 1A illustrates an ultrasonic transmission / reception according to an example of the first embodiment. The top view which looked at the instrument fixture from the direction of the arrow a of FIG.1 (b), FIG.1 (b) shows the ultrasonic transducer attachment concerning the Example of 1st Embodiment in Fig.1 (a) and a figure. Sectional drawing seen from the direction of the arrow cut along AA ′ in FIG. 1 (c), FIG. 1 (c) shows the ultrasonic transducer mounting device according to the example of the first embodiment in FIG. 1 (b). It is the bottom view seen from the direction of arrow c. FIG. 2 is a cross-sectional view showing an example of a schematic configuration of an ultrasonic transducer having a case with a flange. FIG. 3 is an enlarged cross-sectional view showing a hole portion of a tube wall to which an ultrasonic transducer is attached using the ultrasonic transducer fixture according to the example of the first embodiment. FIG. 4 is a cross-sectional view of a tube to which an ultrasonic transducer is attached using the ultrasonic transducer fixture according to an example of the first embodiment. FIG. 5 is a cross-sectional view showing an example of a schematic configuration of the ultrasonic transducer fixture of the example of the first embodiment and a modification thereof, and FIG. 5A is the first embodiment. Sectional drawing which shows an example of schematic structure of the ultrasonic transducer attachment concerning the Example of this, FIG.5 (b) is an example of schematic structure of the ultrasonic transducer attachment of the 1st modification of 1st Embodiment. FIG.5 (c) is sectional drawing which shows an example of schematic structure of the ultrasonic transducer attachment tool of the 2nd modification of 1st Embodiment. FIG. 6 is a cross-sectional view illustrating an example of a schematic configuration of an ultrasonic fluid measurement device according to an example of the second embodiment.

(First embodiment)
FIG. 1 is a diagram illustrating an example of a schematic configuration of an ultrasonic transducer mounting fixture according to an example of the first embodiment, and FIG. 1A illustrates an ultrasonic transmission / reception according to an example of the first embodiment. The top view which looked at the instrument fixture from the direction of the arrow a of FIG.1 (b), FIG.1 (b) shows the ultrasonic transducer attachment concerning the Example of 1st Embodiment in Fig.1 (a) and a figure. Sectional drawing seen from the direction of the arrow cut along AA ′ in FIG. 1 (c), FIG. 1 (c) shows the ultrasonic transducer mounting device according to the example of the first embodiment in FIG. 1 (b). It is the bottom view seen from the direction of arrow c.

  FIG. 2 is a cross-sectional view showing an example of a schematic configuration of an ultrasonic transducer having a case with a flange.

  FIG. 3 is an enlarged cross-sectional view showing a hole portion of a tube wall to which an ultrasonic transducer is attached using the ultrasonic transducer fixture according to the example of the first embodiment.

  Hereinafter, the ultrasonic transducer fixture according to the first embodiment will be described with reference to FIGS. 1 to 3. In addition, the code | symbol was attached | subjected only in order to illustrate the correspondence of this embodiment and its Example to the last, and the structure of the fluid control valve of this embodiment is not limited to FIG. Hereinafter, the same applies to other embodiments.

  As illustrated in FIGS. 1 to 3, the ultrasonic transducer fitting according to the first embodiment includes an ultrasonic transducer 50 having a case 52 with a flange 70 as a tube wall of an ultrasonic fluid measuring device. An ultrasonic transducer mounting tool for mounting in a hole 82 provided in 80, which is made of an elastic body, and sandwiching the flange 70, the ultrasonic transducer 50 is attached to the ultrasonic transducer mounting tool. The first clamping unit 11 to be fixed and the second clamping unit 15 to fix the ultrasonic wave transmitter / receiver fixture to the tube wall 80 by clamping the edge of the hole 82 are provided. With such a configuration, it is possible to simplify the work of attaching the ultrasonic transducer 50 to the tube wall 80.

  As illustrated in FIG. 1, in the ultrasonic transducer attachment according to the first embodiment, the island-shaped protrusions 12 or the island-shaped protrusions 16 are provided on at least one of the first holding part 11 and the second holding part 15. The ultrasonic transducer mounting fixture may be in contact with at least one of the flange 70 and the tube wall 80 by the protrusion 12. In such a configuration, the contact area between the ultrasonic transducer fixture and the ultrasonic transducer 50 or the contact area between the ultrasonic transducer fixture and the tube wall 80 is reduced. Therefore, it is possible to more effectively suppress vibration from propagating from the ultrasonic transducer 50 to the tube wall 80 or from the tube wall 80 to the ultrasonic transducer 50.

  As illustrated in FIG. 1 and FIG. 3, the ultrasonic wave transmitter / receiver attachment according to the first embodiment includes a tube wall 80 in which the first holding part 11 and the second holding part 15 form the edge of the hole 82. In the thickness direction (the direction of the arrow in FIG. 3), they may not be in the same plane and may be separated from each other in the thickness direction. In such a configuration, since the ultrasonic transducer 50 and the tube wall 80 are separated in the thickness direction of the tube wall 80, the vibration is attenuated while the vibration is transmitted along the thickness direction. Therefore, it is possible to more effectively suppress vibration from propagating from the ultrasonic transducer 50 to the tube wall 80 or from the tube wall 80 to the ultrasonic transducer 50.

  As illustrated in FIG. 1, the ultrasonic transducer fixture of the first embodiment may be configured by a single member. With such a configuration, the work of attaching the ultrasonic transducer 50 to the tube wall 80 is further simplified, and the work efficiency is improved.

  As illustrated in FIG. 1, the ultrasonic transducer fixture according to the first embodiment has an ultrasonic transmitter / receiver by sandwiching a flange 70 inside the cylindrical body at one end of the cylindrical body. A first holding portion 11 for fixing the ultrasonic transducer 50 to the fixture attachment is provided, and the tube wall is formed by holding the edge of the hole 82 outside the cylindrical body at the other end of the cylindrical body. 80 may be provided with a second sandwiching portion 15 for fixing the ultrasonic transducer fixture. Here, the length of the cylindrical body in the main axis direction (vertical direction in FIG. 1B) is arbitrary, and a ring shape is also included in the cylindrical body.

  As illustrated in FIG. 1, the first clamping portion 11 protrudes toward the one end (upward direction in FIG. 1B) along the main axis of the cylindrical body, and is flanged from the other end side. May be provided with island-shaped protrusions 12 for abutting 70, or ring-shaped protrusions 14 for projecting from the inner wall of the cylindrical body toward the main shaft and abutting on the flange 70 from the one end side. You may have. The protrusion 12 is not limited to the island shape, and may be, for example, a continuous ring-shaped protrusion. The protrusion 14 is an island-shaped protrusion that protrudes toward the other end (downward in FIG. 1B) along the main axis of the cylindrical body and comes into contact with the flange 70 from the one end side. May be.

  As illustrated in FIG. 1, the second sandwiching portion 15 protrudes toward the other end (downward in FIG. 1B) along the main axis of the cylindrical body, and is flanged from the one end side. May be provided with an island-like protrusion 16 for abutting 70, or a ring shape for projecting from the outer wall of the cylindrical body in the opposite direction (outside) to the main shaft and abutting against the flange 70 from the other end side. The protrusion 18 may be provided. The protrusion 16 is not limited to an island shape, and may be, for example, a continuous ring-shaped protrusion. The protrusion 18 is an island-shaped protrusion that protrudes toward the one end (upward in FIG. 1B) along the main axis of the cylindrical body and comes into contact with the flange 70 from the other end. May be.

  Although the fluid in this embodiment contains gas, a liquid, etc., the ultrasonic transducer fixture of 1st Embodiment is applied suitably especially when a fluid is gas.

[Example]
With reference to FIG. 1, the ultrasonic transducer fixture 100 according to the example of the present embodiment will be described in more detail.

  The ultrasonic transducer attachment 100 is generally made of an elastic body having a ring shape with a circular hole formed in the center. The radius of the hole at one end (lower side in FIG. 1 (b)) along the axial direction of the ring is larger than the radius of the hole formed at the other end (upper side in FIG. 1 (b)). It is getting smaller. A step is formed on the inner wall of the hole from one side (lower side in FIG. 1B) to the other side (upper side in FIG. 1B). In the stepped portion, a plurality of island-shaped projections 12 (island-like projections) are formed at equal intervals (every 45 degrees) on the concentric surface forming a plane perpendicular to the axial direction. Has been. In the stepped portion, a ring-shaped protrusion 14 (annular protrusion) is formed on the cylindrical inner wall surface extending along the axial direction so as to protrude inward of the hole. The protrusion 12 and the protrusion 14 form the first clamping part 11.

  The radius of the outer wall at one end (lower side in FIG. 1 (b)) of the ring shape formed by the ultrasonic transducer fixture 100 is concentric at the other end (upper side in FIG. 1 (b)). It is smaller than the radius of the outer wall. A step is formed on the outer wall from one side to the other. In the stepped portion, a plurality of island-shaped projections 16 (island projections) are formed at equal intervals (every 45 degrees) on the concentric surface forming a plane perpendicular to the axial direction. Has been. In the stepped portion, a ring-shaped protrusion 18 (annular protrusion) is formed on the cylindrical outer wall surface extending along the axial direction so as to protrude in the outer direction of the cylinder. The protrusion 16 and the protrusion 18 form the second holding part 15.

  The elastic body is a material having elasticity to such an extent that it is easy to attach the ultrasonic transducer fitting 100 to the tube wall 80 or to attach the ultrasonic transducer 50 to the ultrasonic transducer fixture 100. . In many cases, the tube wall 80 or the ultrasonic transducer 50 has almost no elasticity. Therefore, the elasticity of the elastic body can be appropriately adjusted so that the assembly work can be easily performed in preparation for such a case. Specifically, rubber or plastic is suitably used as the elastic body.

  More specifically, NBR (nitrile butadiene rubber, nitrile rubber) or fluorosilicone rubber is preferably used as the elastic body. The lower limit of the hardness of the elastic body is preferably Shore A30 or more, and more preferably A40 degrees or more. The upper limit of the hardness of the elastic body is preferably 70 degrees or less Shore A, more preferably 60 degrees or less, and most preferably 50 degrees or less. The range of the hardness of the elastic body is preferably from 30 degrees A to 70 degrees A Shore, more preferably from 40 degrees A to 60 degrees A, and most preferably from 40 degrees A to 50 degrees A.

  With reference to FIG. 2, a configuration example of an ultrasonic transducer having a case with a flange will be described in more detail.

  The ultrasonic transducer 50 includes a cylindrical case 52 having a ridge that spreads outward over the entire circumference of the opening end. The other end of the case 52 is closed to form a bottom surface, and a matching layer 56 is bonded and fixed to the flat outer wall with an epoxy adhesive. The opening of the case 52 is sealed with a disk-shaped sealing body 58. The peripheral edge of the sealing body 58 and the flange of the case 52 are joined by welding or the like, and the flange 70 is formed. A piezoelectric body 54 is disposed inside the space formed by the case 52 and the sealing body 58. The piezoelectric body 54 is bonded and fixed to the bottom surface of the case 52 with an epoxy adhesive. A hole is formed in the center of the sealing body 58, and an insulator 64 is disposed so as to fill the hole. A first terminal 62 is disposed so as to penetrate the insulator 64. A conductive rubber 60 is disposed between the first terminal 62 and the piezoelectric body 54. A second terminal 66 is connected to the outer wall of the sealing body 58. The first terminal 62 and the second terminal 66 are insulated by the insulator 64. A groove 55 is provided in the piezoelectric body 54. An electrode (not shown) divided by the groove 55 is bonded and fixed between the piezoelectric body 54 and the bottom surface of the case 52 via a thin adhesive layer of 10 μm or less so as to ensure electrical conduction. Also good.

  The case 52 and the sealing body 58 are made of stainless steel having a thickness of 0.1 mm to 0.5 mm, for example. The matching layer 56 is made of, for example, a material made of a mixture of epoxy resin and hollow glass spheres.

  When the ultrasonic transducer 50 receives ultrasonic waves, the ultrasonic waves are input from the lower side of FIG. 2 to the matching layer 56, and the received ultrasonic pulses are converted into electric signals by the piezoelectric body 54. The electrical signal is taken out between the first terminal 62 and the second terminal 66.

  When the ultrasonic transducer 50 transmits ultrasonic waves, the piezoelectric body 54 uses the case 52 and the sealing body 58 that are electrically connected to the second terminal 66 as the ground, and the first terminal 62 and the second terminal 66 are interposed between them. It vibrates when a drive electric input is applied. The vibration is output as an ultrasonic pulse downward in FIG. 2 through the matching layer 56. At the same time, the case 52 also vibrates. The vibration is transmitted from the transmission-side ultrasonic transducer 50 to the reception-side ultrasonic transducer 50 through the tube wall to which the ultrasonic transducer 50 is attached. On the receiving side, the vibration and the received ultrasonic pulse are combined, and the amplitude and phase change, causing an error in measurement. In the present embodiment, the problem is reduced by the ultrasonic transducer fixture 100.

  The external shape of the ultrasonic transducer is not particularly limited. For example, the outer shape is not limited to a circular cross-sectional shape perpendicular to the main axis (vertical axis in FIG. 2), and the cross-sectional shape may be a square or a rectangle.

  The shape of the flange is not particularly limited. As long as the 1st clamping part of an ultrasonic transducer attachment tool can be clamped, a flange may be what kind of composition. For example, the flange need not be provided so as to protrude over the entire outer periphery of the case as described above, and the flange may be provided so as to protrude only at a part of the outer periphery of the case. The flange may protrude from the other part of the outer wall.

  With reference to FIG. 3, the aspect in which the ultrasonic transducer is held in the hole of the tube wall using the ultrasonic transducer fixture of the example of the present embodiment will be described in more detail.

  To describe the outline of the embodiment, the ultrasonic transducer 50 is held so as to be fitted inside the ring formed by the ultrasonic transducer fixture 100, and the ultrasonic transducer fixture 100 is ultrasonic transmission / reception. In a state where the container 50 is held, the container 50 is held so as to be fitted into the hole 82 formed in the tube wall 80. Thereby, the ultrasonic transducer 50 is held so as to maintain a predetermined positional relationship with the tube wall 80 via the ultrasonic transducer attachment 100.

  The peripheral part of the flange 70 is clamped by the protrusion 12 and the protrusion 14 that constitute the first clamping part 11. The ultrasonic transducer 50 is held so that the matching layer 56 protrudes from the opening opposite to the end where the first clamping portion 11 is formed through the hole of the ultrasonic transducer fixture 100. The The tube wall 80 constituting the edge of the hole 82 is pinched by the projection 16 and the projection 18 constituting the second clamping portion 15. The shape of the hole 82 viewed from the thickness direction of the tube wall 80 is a circular shape with a size that allows the ultrasonic transducer 50 to be accommodated with a margin. The edge of the hole 82 may be slightly thinner.

  With the above-described aspect, the ultrasonic transducer fixture 100 is configured to transmit and receive an ultrasonic wave so that the surface where the ultrasonic wave is output or input faces the fluid flow path in the hole 82 formed in the tube wall 80. The container 50 is held.

  FIG. 4 is a cross-sectional view of a tube to which an ultrasonic transducer is attached using the ultrasonic transducer fixture according to an example of the first embodiment.

  The tube wall 80 constitutes a flow path so as to allow fluid to flow from left to right along the arrow in FIG. Two attachment pipes 81 are formed so as to branch from the flow path so as to extend at a predetermined angle with the main axis of the flow path formed by the pipe wall 80. The angle formed by the flow direction of the fluid flowing in the flow path and one attachment pipe 81 is equal to the angle formed by the opposite direction of the flow direction and the other attachment pipe 81. In other words, one attachment tube 81 and the other attachment tube 81 are formed so as to be plane-symmetric with respect to a plane perpendicular to the fluid flow direction. The inside of the flow path and one end of the attachment pipe 81 are in communication with each other, and each of the holes 82 formed by the opening at the other end of the attachment pipe 81 is subjected to ultrasonic transmission / reception via the ultrasonic transducer fitting 100. A waver 50 is attached. Each of the ultrasonic transducers 50 is attached such that the ultrasonic transmission / reception surface (the surface on which the matching layer 56 is attached) faces the inside of the attachment tube 81. The ultrasonic wave transmitted from one ultrasonic transducer 50 propagates in the fluid flowing through the inside of the flow path formed by the tube wall 80, and the tube located between the two ultrasonic transducers 50. Of the inner wall of the wall 80, the light is reflected by the reflecting portion 84 provided on the inner wall opposite to the side where the attachment tube 81 is formed, and reaches the other ultrasonic transducer 50. The arrival time of the ultrasonic wave changes according to the flow rate of the fluid. Based on the change, the flow velocity or flow rate of the fluid is measured. As a specific method of measurement, a well-known method can be adopted, and detailed description thereof is omitted.

  The configuration shown in FIG. 4 is preferably arranged inside an airtight casing configured to be filled with a fluid to be measured in the ultrasonic fluid measuring device. That is, the ultrasonic transducer attachment device is configured by attaching an ultrasonic transducer having a case with a flange to a hole provided in a tube wall of the ultrasonic fluid measuring device, and housing the ultrasonic fluid measuring device. It is preferable that the ultrasonic wave transmitter / receiver mounting tool is disposed so that the tube wall, the ultrasonic wave transmitter / receiver, and the ultrasonic wave transmitter / receiver mounting tool are immersed in the fluid to be measured that fills the inside.

  In such a configuration, as will be described later in the second embodiment, even if the ultrasonic transducer fixture does not seal the ultrasonic transducer and the tube wall without gaps, the ultrasonic transducer and the tube wall The amount of fluid flowing between them can be made small enough to be ignored. By measuring the speed and amount of the fluid passing through the flow path inside the tube wall using the ultrasonic transducer, the flow rate of the fluid passing through the ultrasonic fluid measuring device can be accurately measured. Since the sealing property by the ultrasonic transducer attachment is not required, it becomes easy to provide island-like protrusions in the sandwiching portion. The island-shaped protrusion inevitably creates a gap between the ultrasonic transducer or the tube wall. It is difficult to adopt when strict sealing performance is required.

  The ultrasonic transmitter / receiver attachment 100 can attach the ultrasonic transmitter / receiver 50 to the tube wall 80 without using a fastening member such as a screw, by a sandwiching portion made of an elastic body. Therefore, it is possible to dramatically simplify the work of attaching the ultrasonic transducer to the tube wall.

  According to the ultrasonic transducer fixture 100, at least a part of the flange 70 and the ultrasonic transducer fixture 100 abuts on the island-shaped protrusion 12 formed on the ultrasonic transducer fixture 100. Therefore, it is possible to effectively suppress the propagation of vibration from the ultrasonic transducer 50 to the tube wall 80 or from the tube wall 80 to the ultrasonic transducer 50.

  The ultrasonic transducer fixture 100 abuts only one of the main surfaces of the flange facing the fluid flow path by the island-shaped protrusions 12. With such a configuration, it is possible to further effectively suppress the propagation of vibration from the ultrasonic transducer 50 to the tube wall 80 or from the tube wall 80 to the ultrasonic transducer 50.

  According to the ultrasonic transducer fixture 100, at least a part of the tube wall 80 and the ultrasonic transducer fixture 100 constituting the edge of the hole 82 is formed in the ultrasonic transducer fixture 100. Since the contact is made by the island-shaped protrusion 16, it is possible to effectively suppress the propagation of vibration from the ultrasonic transducer 50 to the tube wall 80 or from the tube wall 80 to the ultrasonic transducer 50.

  The ultrasonic transducer mounting fixture 100 abuts only the main surface of the tube wall 80 constituting the edge of the hole 82 on the opposite side of the main surface of the tube wall 80 by the island-shaped protrusion 12. With such a configuration, it is possible to further effectively suppress the propagation of vibration from the ultrasonic transducer 50 to the tube wall 80 or from the tube wall 80 to the ultrasonic transducer 50.

  According to the ultrasonic transducer attachment 100, the surface on the opposite side of the flow path among the main surfaces of the flange 70 is held by the ring-shaped protrusion 14. The ultrasonic transducer 50 is prevented from coming off from the ultrasonic transducer fixture 100 in the outward direction of the flow path. Therefore, the ultrasonic transducer 50 can be reliably held by the tube wall 80.

  According to the ultrasonic transducer attachment 100, the surface on the flow path side of the main surface of the tube wall 80 that forms the edge of the hole 82 is held by the ring-shaped protrusion 14. The ultrasonic transducer fitting 100 is prevented from coming off the hole 82 in the direction of the outside of the flow path. Therefore, the ultrasonic transducer 50 can be reliably held by the tube wall 80.

  In the ultrasonic transducer fixture 100, the first clamping part 11 and the second clamping part 15 are separated from each other in the thickness direction because they are not in the same plane in the thickness direction of the tube wall 80 (see FIG. 3). It is configured. Therefore, it is possible to more effectively suppress vibration from propagating from the ultrasonic transducer 50 to the tube wall 80 or from the tube wall 80 to the ultrasonic transducer 50.

  In addition, although the protrusion 14 and the protrusion 18 were formed as ring-shaped protrusions, one or both of them may be formed as island-shaped protrusions. Although the protrusion 12 and the protrusion 16 are formed as island-shaped protrusions, either one or both may be formed as ring-shaped protrusions.

  The ultrasonic transducer fixture 100 may be composed of a plurality of members. For example, it is the same shape as FIG. 1, Comprising: You may be divided | segmented into two in the center. In such a configuration, when manufacturing using a mold, it is easy to remove from the mold.

[Modification]
FIG. 5 is a cross-sectional view showing an example of a schematic configuration of the ultrasonic transducer fixture of the example of the first embodiment and a modification thereof, and FIG. 5A is the first embodiment. Sectional drawing which shows an example of schematic structure of the ultrasonic transducer attachment concerning the Example of this, FIG.5 (b) is a schematic structure of the ultrasonic transducer attachment concerning the 1st modification of 1st Embodiment. FIG. 5C is a cross-sectional view showing an example of a schematic configuration of an ultrasonic transducer mounting tool according to a second modification of the first embodiment.

  The ultrasonic transducer fitting of the modification includes a contact portion that contacts a portion of the case 52 other than the flange 70.

  As shown in FIG. 5A, in the ultrasonic transducer mounting tool 100 according to the example of the first embodiment, the first clamping unit 11 is in contact with only the flange 70 of the case 52. That is, the gap 17 exists between the ultrasonic transducer mounting fixture 100 and the side wall of the case 52, and the ultrasonic transducer mounting fixture 100 and the side wall are not in contact with each other. Such a configuration is effective in reducing the amount of vibration transmitted from the case 52 to the tube wall 80.

  The ultrasonic transducer attachment 100A according to the first modification of the first embodiment shown in FIG. 5B has protrusions 19 formed as contact portions on the inner wall facing the side wall of the case 52. As a result, the ultrasonic transducer mounting fixture 100 </ b> A comes into contact with the side wall of the case 52. According to such a configuration, the case 52 is more stably held by the ultrasonic transducer fixture 100A.

  5C, the ultrasonic transducer fixture 100B according to the second modification of the first embodiment has an inner wall facing the side wall of the case 52 as a contact portion as a whole. Abut. According to such a configuration, the case 52 is more stably held by the ultrasonic transducer fixture 100A.

  The shape of the abutting portion that abuts the portion other than the flange 70 in the case 52 is not limited to the above-described shape. The contact portion may have any shape as long as the case 52 is effective for more stably being held by the ultrasonic transducer fixture 100A.

(Second Embodiment)
The ultrasonic fluid measuring device of the second embodiment includes an ultrasonic transducer having a case with a flange, the ultrasonic transducer fixture of the first embodiment, and a tube wall provided with a hole. Have. According to this configuration, the assembly work of the ultrasonic fluid measuring device can be simplified. Also in the ultrasonic fluid measuring device of the second embodiment, the same modification as that shown in the first embodiment can be applied to the configuration of the ultrasonic transducer attachment.

  Examples of the ultrasonic fluid measurement device according to the second embodiment will be described below. In this embodiment, the case where the fluid is a gas will be described.

  FIG. 6 is a cross-sectional view illustrating an example of a schematic configuration of an ultrasonic fluid measurement device according to an example of the second embodiment.

  As shown in FIG. 6, the ultrasonic fluid measuring apparatus 200 according to the embodiment includes a casing 40 provided with a gas inlet 20 and a gas outlet 30 and hermetically sealed, and the example of the first embodiment. And a tube wall 80 to which the ultrasonic transducer 50 is attached via the ultrasonic transducer fitting 100.

  The tube wall 80 is disposed inside the chamber 42 formed inside the housing 40 together with the ultrasonic transducer 50 and the ultrasonic transducer attachment 100. One end of the tube wall 80 is open to the chamber 42, the other end is connected to the gas outlet 30, and the gas flow path formed by the tube wall 80 communicates with the gas outlet 30.

  Since the ultrasonic transducer fixture 100, the tube wall 80, and the ultrasonic transducer 50 can each have the same configuration as that described in the first embodiment, detailed description thereof will be omitted.

  The ultrasonic transducer fixture 100, the tube wall 80, and the ultrasonic transducer 50 are an airtight housing 40 configured to be filled with a fluid to be measured in the ultrasonic fluid measuring device 200. It is arrange | positioned inside. That is, the ultrasonic transducer fitting 100 attaches the ultrasonic transducer 50 having the case 52 with the flange 70 to the hole 82 provided in the tube wall 80 of the ultrasonic fluid measuring device 200, and ultrasonic waves The pipe wall 80, the ultrasonic transducer 50, and the ultrasonic transducer fixture 100 are disposed so as to be immersed in the measurement target fluid that fills the inside of the casing 40 of the fluid measuring device.

  In other words, the ultrasonic fluid measuring apparatus 200 includes a housing 40 having a chamber 42, and the ultrasonic transducer attachment 100, the ultrasonic transducer 50, and the tube wall 80 are provided inside the chamber 42. The tube wall 80 has an opening communicating with the chamber 42, and the housing 40 is formed with the gas inlet 20 and the gas outlet 30 so that the chamber 42 communicates with the outside. The channel formed is in communication with either the gas inlet 20 or the gas outlet 30.

  The gas flowing in from the gas inlet 20 fills the inside of the chamber 42, passes through the gas flow path formed by the tube wall 80, and then flows out of the housing 40 through the gas outlet 30. According to such a configuration, all of the gas flowing into the gas outlet 30 passes through the inside of the tube wall 80 and is discharged from the gas outlet 30. Therefore, the flow rate and flow velocity of the gas flowing through the ultrasonic fluid measuring device 200 can be accurately measured using the ultrasonic transducer 50. The same effect can be obtained when the tube wall 80 communicates with the gas inlet 20 and the gas flows from the gas inlet 20 through the tube wall 80 into the chamber 42.

  The gas is filled inside the chamber 42, and the gas pressure is almost equal between the inside and the outside of the tube wall 80. Therefore, even if the sealing by the ultrasonic transducer attachment 100 is insufficient, the gap between the ultrasonic transducer attachment 100 and the tube wall 80 or the ultrasonic transducer attachment 100 and the ultrasonic transmission / reception. The amount of gas flowing through the gap with the vessel 50 is so small that it can be ignored, and the influence on the measurement of flow velocity and flow rate can be ignored. That is, the fluid can be accurately measured regardless of the sealing property of the ultrasonic transducer fixture 100.

  In the ultrasonic fluid measuring apparatus 200, even if the ultrasonic transducer mounting fixture does not seal the ultrasonic transducer and the tube wall without gaps, the ultrasonic fluid measuring device 200 flows between the ultrasonic transducer and the tube wall. The amount of fluid can be made small enough to be ignored. By measuring the speed and amount of the fluid passing through the flow path inside the tube wall using the ultrasonic transducer, the flow rate of the fluid passing through the ultrasonic fluid measuring device can be accurately measured.

  Since the sealing property by the ultrasonic transducer attachment is not required, it becomes easy to provide island-like protrusions in the sandwiching portion. The island-shaped protrusions are likely to have a gap between the ultrasonic transducer or the tube wall. When strict sealing performance is required, it is relatively difficult to adopt. Since the sandwiching portion includes the island-shaped protrusions, it is possible to more effectively suppress vibration from propagating from the ultrasonic transducer to the tube wall or from the tube wall to the ultrasonic transducer.

  Also in the ultrasonic fluid measuring apparatus 200, the same modification as that shown in the first embodiment can be applied to the configuration of the ultrasonic transducer mounting fixture.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  The ultrasonic transducer fitting and the ultrasonic fluid measuring device of the present invention are an ultrasonic transducer fitting and an ultrasonic fluid measuring device capable of simplifying the mounting operation of the ultrasonic transducer on the tube wall. Useful.

DESCRIPTION OF SYMBOLS 11 1st clamping part 12 protrusion 14 protrusion 15 2nd clamping part 16 protrusion 17 gap | interval 18 protrusion 19 protrusion 20 gas inflow port 30 housing | casing 42 chamber 50 ultrasonic transducer 52 case 54 piezoelectric body 55 groove | channel 56 alignment Layer 58 Sealing body 60 Conductive rubber 62 First terminal 64 Insulator 66 Second terminal 70 Flange 80 Tube wall 81 Mounting tube 82 Hole 84 Reflector 100 Ultrasonic transducer mounting device 200 Ultrasonic fluid measuring device

Claims (6)

An ultrasonic transducer fitting for attaching an ultrasonic transducer having a case with a flange to a hole provided in a tube wall of an ultrasonic fluid measuring device,
Composed of elastic body,
A first clamping unit that fixes the ultrasonic transducer to the ultrasonic transducer fixture by clamping the flange;
A second clamping part for fixing the ultrasonic transducer fixture to the tube wall by clamping the edge of the hole ;
The first sandwiching portion and the second sandwiching portion are configured to be separated from each other in the thickness direction by not being in the same plane in the thickness direction of the tube wall constituting the edge of the hole.
Ultrasonic transducer fitting.   The island-shaped protrusion is provided on at least one of the first holding part and the second holding part, and the ultrasonic wave transmitter / receiver fitting comes into contact with at least one of the flange and the tube wall by the protrusion. The ultrasonic transducer fitting according to 1. It is constituted by a single member, the ultrasonic transducer fitting according to claim 1 or 2. The ultrasonic transducer mounting device according to any one of claims 1 to 3 , further comprising a contact portion that contacts a portion other than the flange of the case. The ultrasonic transducer fixture according to any one of claims 1 to 4 ,
The ultrasonic transducer; and
An ultrasonic fluid measuring device having the tube wall. A housing having a chamber;
The ultrasonic transducer fixture, the ultrasonic transducer and the tube wall are provided inside the chamber;
The tube wall has an opening communicating with the chamber;
The casing is formed with a gas inlet and a gas outlet so that the chamber communicates with the outside.
The ultrasonic fluid measurement device according to claim 5 , wherein a flow path formed by the tube wall communicates with one of the gas inlet and the gas outlet.

Images