CN220625399U - Probe device of ultrasonic flowmeter - Google Patents

Abstract

The application discloses a probe device of an ultrasonic flowmeter, which comprises a probe rod, a connecting wire, an upper connecting seat, a ball valve and a lower connecting seat; the mounting hole at the head of the probe rod is a step hole provided with a flaring end communicated with the outside, and the axis of the mounting hole forms a set angle with the axis of the probe rod; the mounting seat of the ultrasonic transducer is embedded at the small opening end of the mounting hole, and a ring groove is formed between the side wall of the flaring end and the side wall of the acoustic wedge of the ultrasonic transducer and the plane of the circular ring surface of the mounting seat; an elastic compression sleeve is pressed in the ring groove and is used for limiting the installation position of the ultrasonic transducer; an internal thread is arranged at one end of the upper connecting seat, which is far away from the ball valve, and an inclined plane gradually closing up from the internal thread to the inner wall is also arranged in the upper connecting seat; the inclined plane of the upper connecting seat is embedded with a locking inclined ring, and the internal thread of the upper connecting seat is connected with a locking nut. The ultrasonic transducer can improve measurement accuracy, does not need special tools, is simple and convenient to assemble and disassemble, and is compact in structure and easy to maintain and overhaul.

Description

Probe device of ultrasonic flowmeter

Technical Field

The utility model relates to the technical field of ultrasonic flow meters, in particular to a probe device of an ultrasonic flowmeter.

Background

The ultrasonic flowmeter is used for measuring the pipeline flow data, has the advantages of convenience in measurement, sensitivity and accuracy, and has wide application in industrial production. The ultrasonic flowmeter works on the principle that the propagation time of ultrasonic beams in liquid is proportional to the flow velocity of the liquid, and the flow velocity and flow rate of the liquid are calculated by measuring the time difference between the transmission and the reception of ultrasonic signals.

The ultrasonic flowmeter mainly comprises a probe device and a host, wherein the probe device is provided with ultrasonic transducers, and the probe devices are arranged in pairs and are respectively arranged at the upstream and the downstream of a pipeline to be tested; a connecting wire is arranged between the probe device and the host. The ultrasonic transducers at the upstream and downstream are arranged oppositely, the ultrasonic transducer at the upstream converts the input electric signals into ultrasonic waves and then transmits the ultrasonic waves, the ultrasonic transducer at the downstream converts the received ultrasonic signals into electric signals and transmits the electric signals to the host computer through a connecting wire, and the host computer obtains the flow and the flow velocity through a series of calculation processes and displays the flow and the flow velocity on a display interface on the host computer.

In the related art, a probe device generally includes a probe rod, an ultrasonic transducer, a lower connection seat, a ball valve, an upper connection seat, a locking mechanism, a connection wire, and the like. One end of the lower connecting seat is welded with the outer wall of the pipeline, the other end of the lower connecting seat is connected with the upper connecting seat through a ball valve, and the upper connecting seat is provided with a locking mechanism. The end of the probe rod, which is provided with the ultrasonic transducer, is a head part, and the head part of the probe rod penetrates through the inner hole of the device to the inner wall of the detected pipeline. One end of the connecting wire stretches into the head of the probe rod and is connected with the ultrasonic transducer, and the other end of the connecting wire is connected to the host.

Wherein, ultrasonic transducer shell one end is the sound wedge, and the other end is the mount pad, and the outer terminal surface of sound wedge is the sound wedge face, and the outer terminal surface of mount pad is the wiring end, and the center department of wiring end is opened there is the through-hole. The transducer is internally provided with devices such as a piezoelectric chip, a signal wire and the like, and one end of the signal wire extends out of the through hole of the wiring terminal. The probe rod is internally provided with an inner hole and a mounting hole which are mutually communicated, the inner hole extends along the axial direction of the probe rod, the mounting hole is positioned at the head part, the axis of the mounting hole and the axis of the wire passing hole form a set angle, and the outer end face of the head part of the probe rod is perpendicular to the axial direction of the mounting hole. The mounting seat of the ultrasonic transducer is embedded in the mounting hole of the head inwards, and a gap is reserved between the periphery of the acoustic wedge and the mounting hole. The ultrasonic transducer is fixed in two modes, one is to process internal threads in a mounting hole at the head of a probe rod, screw a nut into a gap between an acoustic wedge and the mounting hole by using a special tool, and press and fix the ultrasonic transducer by the nut; the other is to solder-package the ultrasonic transducer by a gold sealing plate.

In the above technology, because the ultrasonic transducer is fragile, the end face of the nut is required to be flush with the end face of the mounting hole during assembly, the nut may crush the ultrasonic transducer, the nut assembly mode needs to use special tools and has complex operation, and the nut and the mounting hole are not easy to level due to the problem of manufacturing tolerance, so that the measurement precision is affected; jin Fengban the welding packaging process has high requirements, and the mounting position of the transducer is easy to deviate during actual welding, and the measurement accuracy is also affected.

Disclosure of Invention

In order to solve at least one problem mentioned in the background art, the embodiment of the application provides a probe device of an ultrasonic flowmeter, wherein a mounting hole at the head part of a probe rod is a step hole, the flaring end of the mounting hole is communicated with the outside, an ultrasonic transducer is directly embedded in the mounting hole, and is pressed and fixed through an elastic pressing sleeve, so that the acoustic wedge surface of the ultrasonic transducer is flush with the end surface of the head part of the probe rod, the measurement accuracy is improved, the assembly step is simplified, a special tool is not needed, and the ultrasonic transducer is prevented from being damaged due to improper operation; in addition, through the cooperation of last connecting seat and locking bevel ring and probe pole, can conveniently lock the adjustment operation to the probe pole, and whole device compact structure.

The embodiment of the application provides a probe device of an ultrasonic flowmeter, which comprises a probe rod, a connecting wire, an upper connecting seat, a ball valve and a lower connecting seat.

The head of probe pole is equipped with ultrasonic transducer, connecting wire one end stretches into the hole of probe pole and with ultrasonic transducer's signal line is connected, the other end of connecting wire is used for being connected to the host computer. The inner hole of the probe rod extends along the axial direction of the probe rod, the mounting hole at the head of the probe rod is a step hole provided with a flaring end communicated with the outside, and the axis of the mounting hole and the axis of the probe rod form a set angle. The mounting seat of the ultrasonic transducer is embedded at the small opening end of the mounting hole, the wiring end of the mounting seat of the ultrasonic transducer faces the inner hole, and a ring groove is formed between the side wall of the flaring end and the side wall of the acoustic wedge of the ultrasonic transducer and the plane where the circular ring surface of the mounting seat is located. An elastic compression sleeve is pressed in the annular groove and used for limiting the installation position of the ultrasonic transducer.

The ball valve is connected with the upper connecting seat and the lower connecting seat respectively, the probe rod penetrates through the inner holes of the lower connecting seat, the ball valve and the lower connecting seat, the head of the probe rod is positioned on one side, far away from the ball valve, of the lower connecting seat, and the probe rod is in sliding connection with the inner wall of the upper connecting seat. The one end that goes up the connecting seat and keep away from the ball valve is equipped with the internal thread, go up still including by the internal thread to the inclined plane of inner wall gradual binding off in the connecting seat. The inclined plane of the upper connecting seat is embedded with a locking inclined ring, the internal thread of the upper connecting seat is connected with a locking nut, the locking inclined ring and the locking nut are provided with through holes for the probe rod to pass through, the periphery of the locking inclined ring is tightly attached to the inclined plane of the upper connecting seat, the inner wall of the locking inclined ring is tightly attached to the probe rod, and the opposite surfaces of the locking inclined ring and the locking nut are mutually abutted.

In one possible embodiment, the elastic compression sleeve is made of polytetrafluoroethylene.

In one implementation, a sealant is encapsulated in an inner bore of the probe rod near one end of the ultrasonic transducer.

In an implementation manner, along the length direction of the probe rod, a plurality of clamping grooves are formed in the inner wall of the upper connecting seat, and the clamping grooves are annular grooves recessed inwards along the radial direction of the upper connecting seat.

An O-shaped sealing ring is embedded in each clamping groove, and the probe rod is arranged in each O-shaped sealing ring in a penetrating mode.

In one possible embodiment, the number of the clamping grooves is 2 to 3.

In one implementation, sealing gaskets are arranged between the ball valve and the upper connecting seat and between the ball valve and the lower connecting seat.

In one implementation mode, one end of the probe rod far away from the ultrasonic transducer is a tail part, an external thread is arranged at the tail part of the probe rod, a connecting wire lock nut is covered at the external thread, and a through hole is formed in the center of the connecting wire lock nut.

The tail of the probe rod is provided with a counter bore extending along the axial line of the probe rod, a sealing retainer ring, a connecting wire sealing ring and a pressing ring are sequentially arranged in the counter bore from inside to outside, the connecting wire sealing ring is used for being tightly attached to the connecting wire, the pressing ring extends outwards along the axial line of the probe rod and partially extends out of the probe rod, and the pressing ring extends out of the outer end face of the probe rod and is abutted to the inner end face of the connecting wire locking nut.

In one possible embodiment, the connecting wire lock nut is provided with a connecting wire protective sleeve which extends to a side remote from the probe rod and wraps the connecting wire by a set length.

In sum, the mounting hole of probe head department in the probe device of ultrasonic flowmeter of this application is for having the step hole with outside intercommunication, and ultrasonic transducer inlays in the tip of mounting hole, and ultrasonic transducer's sound wedge lateral wall forms the annular with the space between the mounting hole, through setting up the elasticity compression sleeve of crimping in the annular, utilizes the elasticity characteristic of elasticity compression sleeve, makes ultrasonic transducer's mount pad wiring end hug closely with the bottom of the tip of mounting hole to guarantee that sound wedge face flushes with probe pole head outer end face. In addition, one end of the upper connecting seat far away from the ball valve is provided with an internal thread and an inclined plane from outside to inside, and is provided with a locking nut matched with the internal thread and a locking inclined ring attached to the inclined plane, the locking nut is rotated to separate from the locking inclined ring, and after the probe rod is adjusted to a proper extending position along the axis direction of the probe rod, the locking nut is rotated to be in butt joint with the locking inclined ring, so that the locking fixation of the probe rod is realized. The ultrasonic flowmeter's of this application probe device can simplify ultrasonic transducer's dismouting operation, need not to use specialized tool, makes things convenient for daily maintenance to overhaul, avoids causing ultrasonic transducer to damage because of the operation is improper, utilizes elastic material to make ultrasonic transducer mounted position more accurate, improves measuring result's degree of accuracy, and the probe pole stretches into position adjustment, fixed easy and simple to handle, and the device wholly adopts lightweight design, compact structure.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a probe apparatus of an ultrasonic flow meter according to an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

FIG. 4 is an enlarged view of a portion of FIG. 1 at C;

FIG. 5 is a schematic view of the structure of the head of the probe rod according to the embodiment of the present application;

fig. 6 is a schematic diagram (V-shape method) of the installation of the probe device of the ultrasonic flowmeter and the pipe under test according to the embodiment of the present application.

Reference numerals illustrate:

100-probe rod; 110-an inner bore; 120-mounting holes; 121-a small mouth end; 122-flaring end; 130-an elastic compression sleeve; 140-ring grooves; 150-sealing glue; 160-counter bore;

200-an ultrasonic transducer; 210-a mounting base; 220-acoustic wedge; 230-signal line;

300-an upper connecting seat; 310-inclined plane; 320-clamping grooves;

401-locking an inclined ring; 402-locking nut; 403-O-ring seal;

501-ball valve; 502-a lower connecting seat; 503-sealing gasket

600-connecting wires; 601-connecting wire lock nuts; 602-sealing a retainer ring; 603-connecting wire sealing rings; 604-a press ring; 605-connection line protective sheath.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. It is noted that the embodiments depicted in the drawings are only some, but not all, embodiments of the present application. That is, the embodiments described by the drawings are exemplary, intended to be used for explaining the present application, and not to be construed as limiting the present application.

The probe apparatus of the ultrasonic flowmeter according to the embodiment of the present application will be described below with reference to fig. 1 to 6.

The embodiment of the application provides a probe device of an ultrasonic flowmeter, which comprises a probe rod 100, a connecting wire 600, an upper connecting seat 300, a ball valve 501 and a lower connecting seat 502 as shown in fig. 1-3 and 5-6.

The head of the probe rod 100 is equipped with an ultrasonic transducer 200, one end of a connection wire 600 is extended into the inner hole 110 of the probe rod 100 and connected with the signal line 230 of the ultrasonic transducer 200, and the other end of the connection wire 600 is used for being connected to a host. The inner bore 110 of the probe rod 100 extends in the axial direction of the probe rod 100, the mounting hole 120 at the head of the probe rod 100 is a stepped hole provided with a flared end 122 communicating with the outside, and the axis of the mounting hole 120 forms a set angle with the axis of the probe rod 100. The mounting seat 210 of the ultrasonic transducer 200 is embedded in the small opening end 121 of the mounting hole 120, the terminal end of the mounting seat 210 of the ultrasonic transducer 200 faces the inner hole 110, and the annular groove 140 is formed between the side wall of the flaring end 122 and the side wall of the acoustic wedge 220 of the ultrasonic transducer 200 and the plane of the circular ring surface of the mounting seat 210. An elastic compression sleeve 130 is crimped in the ring groove 140, and the elastic compression sleeve 130 is used for limiting the installation position of the ultrasonic transducer 200.

Ball valve 501 is connected with upper and lower connecting seat respectively, and probe pole 100 wears to locate the hole of upper connecting seat 300, ball valve 501 and lower connecting seat 502, and the head of probe pole 100 is located the one side that lower connecting seat 502 kept away from ball valve 501, and probe pole 100 and the inner wall sliding connection of upper connecting seat 300. The end of the upper connecting seat 300 far away from the ball valve 501 is provided with an internal thread, and the upper connecting seat 300 also comprises an inclined plane 310 gradually shrinking from the internal thread to the inner wall. The inclined plane 310 of the upper connecting seat 300 is embedded with a locking inclined ring 401, the internal thread of the upper connecting seat 300 is connected with a locking nut 402, through holes for the probe rod 100 to pass through are formed in the locking inclined ring 401 and the locking nut 402, the periphery of the locking inclined ring 401 is tightly attached to the inclined plane 310 of the upper connecting seat 300, the inner wall of the locking inclined ring 401 is tightly attached to the probe rod 100, and opposite surfaces of the locking inclined ring 401 and the locking nut 402 are mutually abutted.

Wherein, the end of the mounting base 210 of the ultrasonic transducer 200 connected with the side wall of the acoustic wedge 220 forms a circular ring surface.

The depth of the small opening end 121 of the mounting hole 120 at the head of the probe rod 100 is equal to the height of the mounting seat 210 of the ultrasonic transducer 200; the flared end 122 of the mounting hole 120 has a depth greater than or equal to the height of the wedge 220 of the ultrasonic transducer 200.

The outer wall of the elastic compression sleeve 130 is in interference fit with the flared end 122 of the mounting hole 120 of the head of the probe rod 100, and the inner wall of the elastic compression sleeve 130 can be in transition fit or interference fit with the outer wall of the acoustic wedge 220 of the ultrasonic transducer 200.

The ultrasonic transducer 200 is embedded in the small opening end 121 of the mounting hole 120, the elastic pressing sleeve 130 is pressed in the ring groove 140, the elastic pressing sleeve 130 is made of elastic materials, and extrusion deformation is carried out in the ring groove 140 to generate external acting force, so that the wiring end face of the mounting seat 210 of the ultrasonic transducer 200 is clung to the bottom face of the small opening end 121 of the mounting hole 120, namely, the ultrasonic transducer 200 can be accurately fixed at the mounting position, the sound wedge face can be flush with the outer end face of the head of the probe rod, and the assembly requirement is met.

The outer wall of the probe rod 100 can be in transition fit with the inner wall of the upper connecting seat 300 and the inner wall of the locking inclined ring 401, and when the locking nut 402 is rotated to enable the locking nut to be in a non-abutting state with the locking inclined ring 401, the probe rod 100 can smoothly slide on the inner wall of the locking inclined ring 401; the locking nut 402 is rotated to be abutted against the end face of the locking inclined ring 401, the locking inclined ring 401 and the inner wall of the upper connecting seat 300 are mutually extruded, and the locking inclined ring 401 tightly holds the probe rod 100 so as to prevent the probe rod from moving, namely, the probe rod is locked.

The probe device of the ultrasonic flowmeter of the embodiment of the application can select conventional installation modes such as a V-shaped method, a Z-shaped method and a W-shaped method, a V-shaped installation method (shown in fig. 6) is optimized in the application, a proper pipe section and an installation position are selected according to the actual condition of a pipeline, one end of a lower connecting seat 502 is welded on the pipeline, the other end of the lower connecting seat 502 is connected to a ball valve 501, a hole digger is connected with the ball valve 501 and used for perforating a measured liquid pipeline, and the hole digger is detached after the hole digger is perforated. The locking inclined ring 401 and the locking nut 402 are sequentially connected and matched with the upper connecting seat 300, and the tail part of the probe rod 100 passes through the upper connecting seat 300, the locking inclined ring 401 and the locking nut 402. The head of the probe rod 100 connects the upper connector 300 to the ball valve 501 towards the ball valve 501. The probe rod 100 is pushed to sequentially pass through the ball valve 501 and the lower connecting seat 502, the extending depth of the probe rod is determined according to the wall thickness of the measured liquid pipeline, and the locking nut 402 is screwed to be abutted with the locking inclined ring 401, so that the probe rod 100 is locked and fixed.

The probe device of the ultrasonic flowmeter can ensure that the sound wedge end face of the ultrasonic transducer is flush with the outer end face of the head of the probe rod, improves the accuracy of a measuring result, is accurate in assembly position, convenient to assemble and disassemble, convenient to maintain and overhaul in daily life, free of special tools and capable of avoiding damage to the ultrasonic transducer caused by improper operation; the probe rod stretching-in position is conveniently adjusted and locked, and the device is integrally light-weight and compact in structure.

In one possible embodiment, the elastic compression sleeve 130 is made of polytetrafluoroethylene.

Among them, polytetrafluoroethylene has excellent heat resistance, cold resistance, acid resistance, alkali resistance and various organic solvents, and has extremely low friction coefficient. The elastic compression sleeve is preferably made of polytetrafluoroethylene, so that the device has better durability and assembly stability.

In one possible embodiment, as shown in fig. 1-2, the inner bore of the probe rod 100 is potted with a sealant 150 near one end of the ultrasonic transducer 200.

After the ultrasonic transducer 200 is assembled into the mounting hole 120 of the head of the probe rod 100 and the ultrasonic transducer 200 is locked by using the elastic pressing sleeve 130, the inner hole 110 of the probe rod may be filled with the sealant 150, preferably the PU glue 708-5.

Thus, the sealant 150 is adhered to the terminal of the mounting seat 210, so that the ultrasonic transducer 200 can be further positioned and reinforced, and meanwhile, the signal wire 230 led out from the ultrasonic transducer 200 has the functions of fixing and protecting, so that liquid is prevented from penetrating into the probe rod 100, the circuit is prevented from breaking due to bending and winding, maintenance and overhaul are reduced, and the device is enabled to run stably.

In one possible embodiment, as shown in fig. 1 and 3, a plurality of clamping grooves 320 are formed on the inner wall of the upper connecting seat 300 along the length direction of the probe rod 100, and the clamping grooves 320 are annular grooves recessed along the radial direction of the upper connecting seat 300.

An O-ring 403 is embedded in each clamping groove 320, and the probe rod 100 is inserted into each O-ring 403.

Wherein, the end of the upper connecting seat 300 close to the ball valve 501 is provided with a buffer hole communicated with the inner wall, and a larger gap is arranged between the buffer hole and the periphery of the probe rod. Thus, when the head of the probe rod 100 is completely withdrawn into the upper connecting seat 300 from the ball valve 501, the O-shaped sealing ring 403 has a good sealing effect, and the buffer hole provides a certain space to bear a certain pressure, so that the device can be disassembled and assembled under the pressure state of the pipeline, water is not required to be stopped, and the device is safe and simple.

In one implementation, as shown in fig. 1 and 3, the number of the card slots 320 is 2 to 3.

Thus, the device has double/triple sealing effect, and the operation stability is further improved.

In one possible embodiment, as shown in fig. 1, a sealing gasket 503 is disposed between the ball valve 501 and each of the upper and lower connection seats 300 and 502.

Thus, the device is stable in integral connection and good in sealing.

In one implementation, as shown in fig. 1 and 4, one end of the probe rod 100 far away from the ultrasonic transducer 200 is a tail part, the tail part of the probe rod is provided with external threads, a connecting wire lock nut 601 is covered at the external threads, and a through hole is formed in the center of the connecting wire lock nut 601.

The tail of the probe rod 100 is provided with a counter bore 160 extending along the axis of the probe rod 100, a sealing check ring 602, a connecting wire sealing ring 603 and a pressing ring 604 are sequentially arranged in the counter bore 160 from inside to outside, the connecting wire sealing ring 603 is used for being tightly attached to the connecting wire 600, the pressing ring 604 extends outwards along the axis of the probe rod 100 and partially extends out of the probe rod 100, and the outer end surface of the pressing ring 604 extending out of the probe rod 100 is abutted with the inner end surface of the connecting wire locking nut 601.

The connecting wire sealing ring 603 is made of rubber or other elastic materials, the connecting wire locking nut 601 is screwed to be abutted against the pressing ring 604, and the connecting wire sealing ring 603 is extruded by the pressing ring 604 to deform, so that the connecting wire 600 is tightly pressed to be unable to move. This arrangement prevents liquid from penetrating into the bore 110 of the probe shaft 100 and also prevents the connection wire 600 from wearing out during movement within the probe shaft, reducing maintenance costs and extending service life.

In one possible embodiment, as shown in fig. 1 and 4, the outer sleeve of the connection wire lock nut 601 is provided with a connection wire protective sleeve 605, the connection wire protective sleeve 605 extending to a side remote from the probe rod 100 and wrapping the connection wire 600 of a set length.

The connection wire protective sleeve 605 may be made of rubber, preferably silicone rubber. This arrangement can alleviate the bending degree of the connecting wire 600 from the tail portion of the probe rod 100, reduce wear and aging, and further improve stability.

Claims (8)

1. The probe device of the ultrasonic flowmeter is characterized by comprising a probe rod, a connecting wire, an upper connecting seat, a ball valve and a lower connecting seat;

the head of the probe rod is provided with an ultrasonic transducer, one end of the connecting wire extends into the inner hole of the probe rod and is connected with a signal wire of the ultrasonic transducer, and the other end of the connecting wire is connected to a host; the inner hole of the probe rod extends along the axial direction of the probe rod, the mounting hole at the head of the probe rod is a step hole provided with a flaring end communicated with the outside, and the axis of the mounting hole forms a set angle with the axis of the probe rod; the mounting seat of the ultrasonic transducer is embedded at the small opening end of the mounting hole, the wiring end of the mounting seat of the ultrasonic transducer faces the inner hole, and a ring groove is formed between the side wall of the flaring end and the side wall of the acoustic wedge of the ultrasonic transducer and the plane of the circular ring surface of the mounting seat; an elastic compression sleeve is pressed in the annular groove and used for limiting the installation position of the ultrasonic transducer;

the ball valve is respectively connected with the upper connecting seat and the lower connecting seat, the probe rod penetrates through the inner holes of the lower connecting seat, the ball valve and the lower connecting seat, the head of the probe rod is positioned at one side of the lower connecting seat far away from the ball valve, and the probe rod is in sliding connection with the inner wall of the upper connecting seat; an internal thread is arranged at one end of the upper connecting seat far away from the ball valve, and an inclined plane gradually closing in from the internal thread to the inner wall is further arranged in the upper connecting seat; the inclined plane of the upper connecting seat is embedded with a locking inclined ring, the internal thread of the upper connecting seat is connected with a locking nut, the locking inclined ring and the locking nut are provided with through holes for the probe rod to pass through, the periphery of the locking inclined ring is tightly attached to the inclined plane of the upper connecting seat, the inner wall of the locking inclined ring is tightly attached to the probe rod, and the opposite surfaces of the locking inclined ring and the locking nut are mutually abutted.

2. The probe apparatus of an ultrasonic flow meter of claim 1, wherein the elastic compression sleeve is made of polytetrafluoroethylene.

3. The probe device of an ultrasonic flowmeter according to claim 1, wherein a sealant is filled in an end of the inner bore of the probe rod, which is close to the ultrasonic transducer.

4. The probe device of an ultrasonic flowmeter according to any one of claims 1 to 3, wherein a plurality of clamping grooves are formed in the inner wall of the upper connecting seat along the length direction of the probe rod, and the clamping grooves are annular grooves recessed along the radial direction of the upper connecting seat;

an O-shaped sealing ring is embedded in each clamping groove, and the probe rod is arranged in each O-shaped sealing ring in a penetrating mode.

5. The probe apparatus of an ultrasonic flowmeter according to claim 4, wherein the number of said clamping grooves is 2 to 3.

6. The probe apparatus of an ultrasonic flowmeter according to any one of claims 1 to 3, wherein sealing gaskets are provided between the ball valve and the upper and lower connection seats.

7. The probe device of an ultrasonic flowmeter according to any one of claims 1 to 3, wherein one end of the probe rod far away from the ultrasonic transducer is a tail part, the tail part of the probe rod is provided with an external thread, a connecting wire lock nut is covered at the external thread, and a through hole is formed in the center of the connecting wire lock nut;

the tail of the probe rod is provided with a counter bore extending along the axial line of the probe rod, a sealing retainer ring, a connecting wire sealing ring and a pressing ring are sequentially arranged in the counter bore from inside to outside, the connecting wire sealing ring is used for being tightly attached to the connecting wire, the pressing ring extends outwards along the axial line of the probe rod and partially extends out of the probe rod, and the pressing ring extends out of the outer end face of the probe rod and is abutted to the inner end face of the connecting wire locking nut.

8. The ultrasonic flow meter probe apparatus of claim 7, wherein the wire lock nut is externally sleeved with a wire protective sleeve extending to a side remote from the probe rod and wrapping a set length of the wire.