A high temperature radiation resistant ultrasonic sensor

Abstract

The present invention discloses a high-temperature radiation-resistant ultrasonic sensor, wherein the lead of a conductive sheet is led out through a first high-temperature piezoelectric ceramic ring, a conductive ring, a second high-temperature piezoelectric ceramic ring, a mass block, and an intermediate ring of a ceramic insulating ring; the lead of the conductive ring is led out through the second high-temperature piezoelectric ceramic ring, the mass block, and the intermediate ring of the ceramic insulating ring, and the lead of the mass block is short-circuited with the lead of the conductive sheet; the conductive ring is one pole of the sensor, and the short-circuit of the conductive sheet and the mass block is the other pole of the sensor; the present invention adopts a high-temperature piezoelectric ceramic stacking installation method to improve the sensitivity of ultrasonic reception and transmission; a combination method of an inner sleeve and an outer sleeve is designed to realize the installation of the sensor in a blind deep pipe installation environment in an ultrasonic flowmeter; the full set of sensors is connected by metal hard pressing without adhesive bonding, so it can be used in a high-temperature environment.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic sensors, and in particular relates to a high-temperature radiation-resistant ultrasonic sensor. Background Art

[0002] An ultrasonic sensor is a test device that uses ultrasound to measure the flow rate in a pipeline. The device requires a generator that converts electrical signals into ultrasonic signals and a receiver that converts ultrasonic signals into electrical signals.

[0003] Problems with ultrasonic sensors in the prior art:

[0004] The operating temperature of most existing ultrasonic sensors is below 150°C. When the operating temperature is too high, the internal bonding structure will fail, causing the device to stop working.

[0005] The sensitivity coefficient of piezoelectric ceramics used for high temperatures is low, and the ultrasonic sensor structure at room temperature cannot achieve effective transmission of ultrasound. Especially under pipe installation conditions, it is even more difficult for traditional ultrasonic sensors to ensure their sensitivity.

[0006] Therefore, there is an urgent need to develop a high-temperature radiation-resistant ultrasonic sensor to solve the above problems. Summary of the invention

[0007] In order to solve the problems raised in the above background technology, the present invention provides a high-temperature radiation-resistant ultrasonic sensor.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A high temperature radiation resistant ultrasonic sensor, comprising:

[0010] The outer sleeve comprises an outer sleeve bottom, an outer sleeve tube, and an outer sleeve locking ring; the outer sleeve bottom is sealed and connected to the first end of the outer sleeve tube, and the outer sleeve locking ring is fixedly installed in the outer sleeve tube; the outer wall of the outer sleeve tube is welded to the wall of the flow meter;

[0011] Inner sleeve; the inner sleeve comprises an inner sleeve shell, two high-temperature piezoelectric ceramic rings, a conductive ring, a conductive sheet, a mass block, a ceramic insulating ring, and an inner sleeve locking ring; the inner sleeve shell is fixedly installed in the outer sleeve tube, the first end of the inner sleeve shell is connected to the bottom of the outer sleeve, the second end of the inner sleeve shell is connected to the outer sleeve locking ring, and the conductive sheet, the first high-temperature piezoelectric ceramic ring, the conductive ring, the second high-temperature piezoelectric ceramic ring, the mass block, the ceramic insulating ring, and the inner sleeve locking ring are sequentially installed from the first end to the second end of the inner sleeve shell; the conductive sheet lead is led out through the first high-temperature piezoelectric ceramic ring, the conductive ring, the second high-temperature piezoelectric ceramic ring, the mass block, and the middle ring of the ceramic insulating ring, the conductive ring lead is led out through the second high-temperature piezoelectric ceramic ring, the mass block, and the middle ring of the ceramic insulating ring, and the lead of the mass block is short-circuited with the lead of the conductive sheet, the conductive ring is one pole of the sensor, and the conductive sheet and the mass block are short-circuited as the other pole of the sensor.

[0012] Specifically, the outer sleeve bottom is formed into a barrel-shaped structure, the outer sleeve tube is formed into a circular tube-shaped structure, the inner wall of the outer sleeve bottom is provided with an internal thread, the outer wall of the first end of the outer sleeve tube is provided with an external thread, the outer sleeve bottom is threadedly connected to the first end of the outer sleeve tube and sealed and welded.

[0013] Specifically, the outer sleeve locking ring becomes a stepped circular ring structure, and an external thread is arranged on the outer wall of the large diameter end of the outer sleeve locking ring. Correspondingly, an internal thread is arranged on the inner wall of the outer sleeve tube. The outer wall of the large diameter end of the outer sleeve locking ring is threadedly connected with the inner wall of the outer sleeve tube.

[0014] Specifically, an internal thread is provided on the inner wall of the second end of the inner sleeve shell, and an external thread is provided on the outer wall of the inner sleeve locking ring. The inner wall of the second end of the inner sleeve shell is threadedly connected with the outer wall of the inner sleeve locking ring. The inner sleeve locking ring is sleeved on the outer wall of the small diameter end of the outer sleeve locking ring. The length of the small diameter end of the outer sleeve locking ring is longer than the length of the inner sleeve locking ring. During installation, the small diameter end of the outer sleeve locking ring is pressed against the ceramic insulating ring.

[0015] Specifically, an observation window is provided on the inner sleeve shell for observing and adjusting whether the positions of the conductive sheet, the conductive ring, the high-temperature piezoelectric ceramics and the mass block are aligned during the process of being installed into the inner sleeve shell.

[0016] Specifically, an anti-rotation groove is provided on the inner wall of the inner sleeve shell, an anti-rotation notch is provided on the high-temperature piezoelectric ceramic ring, and the high-temperature piezoelectric ceramic ring is tightly fitted with the inner sleeve shell to prevent the high-temperature piezoelectric ceramic ring from circumferential rotation.

[0017] Specifically, a positioning annular groove is provided at the bottom of the outer sleeve bottom, and the first end portion of the inner sleeve housing is installed in the positioning annular groove.

[0018] Specifically, the bottom of the inner sleeve shell is made of ceramic, and the tube wall of the inner sleeve shell is made of metal.

[0019] Specifically, the high-temperature radiation-resistant ultrasonic sensor further comprises a thermal insulation sealing cover; one end of the thermal insulation sealing cover is installed inside the second end of the outer sleeve tube.

[0020] Compared with the prior art, the invention has the following beneficial effects: the high-temperature piezoelectric ceramic stacking method is used to improve the sensitivity of ultrasonic reception and transmission; the combination method of the inner sleeve and the outer sleeve is designed to realize the installation of the sensor in the blind deep pipe installation environment of the ultrasonic flowmeter. The whole set of sensors adopts metal hard pressing connection without glue bonding, so it can be used in high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the main view of this application;

[0022] Figure 2 This is a schematic diagram of the installation structure of the thermal insulation sealing cover in this application;

[0023] Figure 3 This is a schematic diagram of the installation position of the observation window in this application;

[0024] Figure 4 It is a left side view of the inner sleeve housing in this application;

[0025] Figure 5 It is a left view of the high temperature piezoelectric ceramic ring in this application;

[0026] The markings in the figure are:

[0027] 1-outer sleeve tube; 2-outer sleeve locking ring; 3-inner sleeve locking ring; 4-ceramic insulating ring; 5-inner sleeve shell; 51-observation window; 52-anti-rotation groove; 6-mass block; 7-high-temperature piezoelectric ceramic ring; 71-anti-rotation notch; 8-conductive ring; 9-conductive sheet; 10-outer sleeve bottom; 11-thermal insulation sealing cover; 12-positioning annular groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The present invention provides the following technical solutions:

[0030] like Figure 1-2 As shown, a high temperature radiation resistant ultrasonic sensor comprises:

[0031] The outer sleeve comprises an outer sleeve bottom 10, an outer sleeve tube 1, and an outer sleeve locking ring 2; the outer sleeve bottom 10 is sealed and connected to the first end of the outer sleeve tube 1, and the outer sleeve locking ring 2 is fixedly installed in the outer sleeve tube 1; the outer wall of the outer sleeve tube 1 is welded to the wall of the flow meter;

[0032] Inner sleeve; the inner sleeve comprises an inner sleeve shell 5, two high temperature piezoelectric ceramic rings 7, a conductive ring 8, a conductive sheet 9, a mass block 6, a ceramic insulating ring 4, and an inner sleeve locking ring 3; the inner sleeve shell 5 is fixedly installed in the outer sleeve tube 1, the first end of the inner sleeve shell 5 is connected to the bottom of the outer sleeve bottom 10, the second end of the inner sleeve shell 5 is connected to the outer sleeve locking ring 2, and the conductive sheet 9, the first high temperature piezoelectric ceramic ring 7, the conductive ring 8, the second high temperature piezoelectric ceramic ring 7, the conductive ring 8, the second high temperature piezoelectric ceramic ring 9, the conductive sheet 9, the first ... Piezoelectric ceramic ring 7, mass block 6, ceramic insulating ring 4, inner sleeve locking ring 3; the lead of the conductive sheet 9 is led out through the first high-temperature piezoelectric ceramic ring 7, the conductive ring 8, the second high-temperature piezoelectric ceramic ring 7, the mass block 6, and the middle ring of the ceramic insulating ring 4, the lead of the conductive ring 8 is led out from the second high-temperature piezoelectric ceramic ring 7, the mass block 6, and the middle ring of the ceramic insulating ring 4, and the lead of the mass block 6 is short-circuited with the lead of the conductive sheet 9, the conductive ring 8 is one pole of the sensor, and the conductive sheet 9 and the mass block 6 are short-circuited as the other pole of the sensor.

[0033] like Figure 1-2 As shown, the outer sleeve bottom 10 is formed into a barrel-shaped structure, the outer sleeve tube 1 is formed into a circular tubular structure, the inner wall of the outer sleeve bottom 10 is provided with an internal thread, the outer wall of the first end of the outer sleeve tube 1 is provided with an external thread, the outer sleeve bottom 10 is threadedly connected to the first end of the outer sleeve tube 1 and sealed and welded.

[0034] like Figure 1-2 As shown, the outer sleeve locking ring 2 is formed as a stepped circular ring structure, and an external thread is arranged on the outer wall of the large diameter end of the outer sleeve locking ring 2. Correspondingly, an internal thread is arranged on the inner wall of the outer sleeve tube 1. The outer wall of the large diameter end of the outer sleeve locking ring 2 is threadedly connected to the inner wall of the outer sleeve tube 1.

[0035] like Figure 1-2 As shown, an internal thread is provided on the inner wall of the second end of the inner sleeve housing 5, and an external thread is provided on the outer wall of the inner sleeve locking ring 3. The inner wall of the second end of the inner sleeve housing 5 is threadedly connected with the outer wall of the inner sleeve locking ring 3. The inner sleeve locking ring 3 is sleeved on the outer wall of the small diameter end of the outer sleeve locking ring 2. The length of the small diameter end of the outer sleeve locking ring 2 is longer than the length of the inner sleeve locking ring 3. When installed, the small diameter end of the outer sleeve locking ring 2 is pressed against the ceramic insulating ring 4.

[0036] like Figure 3As shown, an observation window 51 is provided on the inner sleeve housing 5, through which the positions of the conductive sheet 9, the conductive ring 8, the high temperature piezoelectric ceramics and the mass block 6 during the process of being installed into the inner sleeve housing 5 can be adjusted, and whether the installation is aligned can be observed.

[0037] like Figure 4-5 As shown, an anti-rotation groove 52 is provided on the inner wall of the inner sleeve housing 5, and an anti-rotation notch 71 is provided on the high-temperature piezoelectric ceramic ring 7. The high-temperature piezoelectric ceramic ring 7 is tightly fitted with the inner sleeve housing 5 to prevent the high-temperature piezoelectric ceramic ring 7 from circumferential rotation.

[0038] like Figure 1-2 As shown, a positioning annular groove 12 is provided at the bottom of the outer sleeve bottom 1, and the first end of the inner sleeve housing 5 is installed in the positioning annular groove. When installing, the inner sleeve can be accurately installed on the center point of the outer sleeve bottom 10. When installing the inner sleeve, the bottom cannot be observed, and the bottom of the inner sleeve and the outer sleeve need to be aligned to ensure that there is no gap between the inner sleeve and the outer sleeve. The propagation condition of ultrasonic vibration is a solid contact without gap.

[0039] In some embodiments, the bottom of the inner sleeve shell 5 is made of ceramic, and the tube wall of the inner sleeve shell 5 is made of metal.

[0040] like Figure 2 As shown, the high temperature radiation resistant ultrasonic sensor also includes a thermal insulation sealing cover 11; one end of the thermal insulation sealing cover 11 is installed inside the second end of the outer sleeve tube 1. The function of the thermal insulation sealing cover 11 is to install the thermal insulation sealing cover 11 after the inner sleeve is installed. Since the thermal insulation sealing cover 11 is made of metal, it can effectively play the role of electromagnetic sealing and protect the tiny signal in the sensor from electromagnetic interference. The thermal insulation sealing cover 11 is relatively long, and the temperature of the inner sleeve and the outer sleeve in contact with the wall of the high temperature flow meter is relatively high. The temperature is reduced by the longer thermal insulation sealing cover 11, which plays the role of thermal insulation. This makes it easy to install some high temperature-resistant connecting cables at its rear end.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature radiation resistant ultrasonic sensor, characterized in that: include: The outer sleeve comprises an outer sleeve bottom, an outer sleeve tube, and an outer sleeve locking ring; the outer sleeve bottom is sealed and connected to the first end of the outer sleeve tube, and the outer sleeve locking ring is fixedly installed in the outer sleeve tube; the outer wall of the outer sleeve tube is welded to the wall of the flow meter; Inner sleeve; the inner sleeve comprises an inner sleeve shell, two high-temperature piezoelectric ceramic rings, a conductive ring, a conductive sheet, a mass block, a ceramic insulating ring, and an inner sleeve locking ring; the inner sleeve shell is fixedly installed in the outer sleeve tube, the first end of the inner sleeve shell is connected to the bottom of the outer sleeve, the second end of the inner sleeve shell is connected to the outer sleeve locking ring, and the conductive sheet, the first high-temperature piezoelectric ceramic ring, the conductive ring, the second high-temperature piezoelectric ceramic ring, the mass block, the ceramic insulating ring, and the inner sleeve locking ring are sequentially installed from the first end to the second end of the inner sleeve shell; the conductive sheet lead is led out through the first high-temperature piezoelectric ceramic ring, the conductive ring, the second high-temperature piezoelectric ceramic ring, the mass block, and the middle ring of the ceramic insulating ring, the conductive ring lead is led out through the second high-temperature piezoelectric ceramic ring, the mass block, and the middle ring of the ceramic insulating ring, and the lead of the mass block is short-circuited with the lead of the conductive sheet, the conductive ring is one pole of the sensor, and the conductive sheet and the mass block are short-circuited as the other pole of the sensor; The outer sleeve locking ring is a stepped ring structure, and an outer thread is provided on the outer wall of the large diameter end of the outer sleeve locking ring. Correspondingly, an inner thread is provided on the inner wall of the outer sleeve tube. The outer wall of the large diameter end of the outer sleeve locking ring is threadedly connected with the inner wall of the outer sleeve tube. An internal thread is arranged on the inner wall of the second end of the inner sleeve shell, and an external thread is arranged on the outer wall of the inner sleeve locking ring. The inner wall of the second end of the inner sleeve shell is threadedly connected with the outer wall of the inner sleeve locking ring. The inner sleeve locking ring is sleeved on the outer wall of the small diameter end of the outer sleeve locking ring. The length of the small diameter end of the outer sleeve locking ring is longer than the length of the inner sleeve locking ring. When installing, the small diameter end of the outer sleeve locking ring is pressed against the ceramic insulating ring.

2. The high temperature radiation resistant ultrasonic sensor according to claim 1, characterized in that: The outer sleeve bottom is formed into a barrel-shaped structure, the outer sleeve tube is formed into a circular tube-shaped structure, the inner wall of the outer sleeve bottom is provided with an internal thread, the outer wall of the first end of the outer sleeve tube is provided with an external thread, the outer sleeve bottom is threadedly connected to the first end of the outer sleeve tube and sealed and welded.

3. The high temperature radiation resistant ultrasonic sensor according to claim 1, characterized in that: The inner sleeve shell is provided with an observation window for observing and adjusting whether the positions of the conductive sheet, the conductive ring, the high-temperature piezoelectric ceramics and the mass block are aligned during the process of being installed into the inner sleeve shell.

4. The high temperature radiation resistant ultrasonic sensor according to claim 1, characterized in that: An anti-rotation groove is arranged on the inner wall of the inner sleeve shell, an anti-rotation notch is arranged on the high-temperature piezoelectric ceramic ring, and the high-temperature piezoelectric ceramic ring is tightly matched with the inner sleeve shell to prevent the high-temperature piezoelectric ceramic ring from circumferentially rotating.

5. The high temperature radiation resistant ultrasonic sensor according to claim 1, characterized in that: A positioning annular groove is arranged at the bottom of the outer sleeve bottom, and the first end portion of the inner sleeve housing is installed in the positioning annular groove.

6. The high temperature radiation resistant ultrasonic sensor according to claim 1, characterized in that: The bottom of the inner sleeve shell is made of ceramic, and the tube wall of the inner sleeve shell is made of metal.

7. The high temperature radiation resistant ultrasonic sensor according to claim 1, characterized in that: The high-temperature radiation-resistant ultrasonic sensor also includes a thermal insulation sealing cover; one end of the thermal insulation sealing cover is installed inside the second end of the outer sleeve tube.

Images