CN216449094U

CN216449094U - Ray transmitting and receiving device

Info

Publication number: CN216449094U
Application number: CN202123362280.5U
Authority: CN
Inventors: 陈小平; 马晓伟; 文鹏荣; 王镇岗
Original assignee: Heimer Xinchen Underwater Technology Shanghai Co ltd
Current assignee: Heimer Xinchen Underwater Technology Shanghai Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-06
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a ray transmitting and receiving device, which comprises a ray transmitting unit and a ray receiving unit, wherein the ray transmitting unit comprises a source installation shell with an opening, an active installation flange is arranged on the opening of the source installation shell, the central hole of the source installation flange is sealed by a ray transmitting window, a radiation source assembly coated by a source isolation kit is arranged in the source installation shell, a collimation hole is arranged on the source isolation kit and is opposite to the central hole of the source installation flange, and the collimation hole and the central hole share a hole center line and are communicated; the line receiving unit comprises a receiving unit shell, a receiving hole and a crystal placing hole are formed in the receiving unit shell, the receiving hole is sealed by a ray window of the receiving unit, a receiving unit flange cover covers the crystal placing hole, and a crystal is arranged in the crystal placing hole; and the ray window of the receiving unit is over against the ray transmitting window in a working state. The utility model has the beneficial effects that: the ray transmitting unit and the ray receiving unit are simple and compact in structure, and can be used in an underwater pressure environment.

Description

Ray transmitting and receiving device

Technical Field

The utility model belongs to the technical field of offshore platform jacket detection equipment, and particularly relates to a ray transmitting and receiving device for a water leakage detector of a guide pipe.

Background

The offshore platform is a basic facility for offshore oil and gas resource production, the safety of the offshore platform is very important, and the jacket is a key point for ensuring the safety of the offshore platform as a supporting structure for bearing the whole platform. Except for the process water filling pipe, the jacket balances the weight of a part of the platform by virtue of buoyancy provided by a closed structure of the jacket, and provides powerful guarantee for stably positioning the ocean platform on the sea surface. However, the pipe is in a severe environment (especially in a splash zone), the operation condition is complex, the pipe bears a non-single load, and the pipe is required to bear the weight of the whole platform and also bear the influences of wind wave load, seismic wave and the like, so that various damages such as fatigue cracks, corrosion and the like inevitably occur in the service process of the pipe frame, seawater permeates into the pipe and even fills the inner cavity of the pipe, the pipe loses the function of providing buoyancy, and meanwhile, the invaded seawater can accelerate the corrosion of the pipe, and the structural safety of the pipe is seriously influenced. In addition, most of the platforms are in service for a long time, and some platforms are in service for a long time or even for an extended period, so that the offshore platform support conduit is subjected to regular water leakage detection, problems are found in time, and the offshore platform support conduit has important significance for guaranteeing continuous and safe production of the platforms.

The fmd (flowed member detection) device is the most effective and critical device for detecting water leakage from underwater conduits. Early devices for jacket water penetration testing were generally based on ultrasonic testing methods. It is reported (wushiwei et al, research and application of ocean platform deep water jacket structure rod piece detection method [ J ]. ocean engineering, 2009,21 (6)), that the ray water penetration rod piece detection method has the advantages of high detection efficiency and low cost compared with the ultrasonic water penetration rod piece detection method. However, although the principle of the water permeation detection method based on the ray detection rod has been formed, a mature and easy-to-use FMD device based on the ray detection method is still lacking in the market.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a radiation transmitting and receiving apparatus as a part of solving the structural design problem of the FMD device.

The technical scheme is as follows:

a ray transmitting and receiving device comprises a ray transmitting unit and a ray receiving unit, and is characterized in that the ray transmitting unit comprises a source mounting shell with an opening, an active mounting flange is arranged on the opening of the source mounting shell, and a ray transmitting window is arranged on the source mounting flange and seals a central hole of the source mounting flange, so that the source mounting shell, the source mounting flange and the ray transmitting window form a sealing system;

a radiation source assembly is arranged in the source installation shell, a source isolation suite made of a ray absorption material is coated outside the radiation source assembly, a collimation hole is formed in the source isolation suite and is opposite to a central hole of the source installation flange, and the collimation hole and the central hole share a hole center line and are communicated;

the ray receiving unit comprises a receiving unit shell, a receiving hole and a crystal placing hole are formed in the receiving unit shell, the receiving hole is sealed by a ray window of the receiving unit, a receiving unit flange cover covers the crystal placing hole, so that a closed cavity is formed in the receiving unit shell, and a crystal is arranged in the closed cavity;

and under the working state, the ray window of the receiving unit is over against the ray emission window.

Compared with the prior art, the utility model has the beneficial effects that: the ray transmitting unit and the ray receiving unit are simple and compact in structure and good in sealing performance, and can be used in an underwater pressure environment.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a radiation emitting unit;

FIG. 3 is a schematic diagram of the internal structure of the radiation emitting unit;

FIG. 4 is a schematic diagram of a ray receiving unit;

FIG. 5 is a schematic diagram of the internal structure of the ray receiving unit;

FIG. 6 is a schematic view of a detector detecting a catheter.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

As shown in fig. 1, a radiation transmitting and receiving apparatus includes a radiation transmitting unit 200 and a radiation receiving unit 300, which are disposed opposite to each other in an operating state, and the radiation receiving unit 300 is configured to receive a radiation signal transmitted by the radiation transmitting unit 200.

As shown in fig. 2 and 3, the radiation emitting unit 200 comprises a source mounting housing 210 having an opening, a source mounting flange 220 is arranged on the opening of the source mounting housing 210, a radiation emitting window 250 for gamma rays to pass through is arranged on the source mounting flange 220, and the radiation emitting window 250 closes the central hole of the source mounting flange 220, so that the source mounting housing 210, the source mounting flange 220 and the radiation emitting window 250 form a sealed system.

Within the source mounting housing 210 is a radiation source assembly that is externally coated with a source isolation kit of radiation absorbing material that positions the radiation source assembly within the source mounting housing 210. A collimation hole 241 is formed in the source isolation kit, and the collimation hole 241 is opposite to the central hole of the source mounting flange 220, and is communicated with the central hole in a hole-sharing manner. The source isolation kit may be made of lead.

In order to facilitate the storage and transportation of the radiation emitting unit 200, a protecting cover 290 made of a radiation absorbing material is detachably fastened to the source mounting flange 220, and the protecting cover 290 shields the source mounting flange 220 and the radiation emitting window 250. The shield cover 290 covers the source mounting flange 220 and covers the interface of the source mounting flange 220 and the source mounting enclosure 210.

The protecting cover 290 is thickened at the center to form a protecting truncated cone 291, and the diameter of the protecting truncated cone 291 is not smaller than the aperture of the collimating hole 241, and is preferably equal to or larger than the diameter of the radiation emitting window 250. The thickness of the protection round platform 291 is larger, so that the absorption of gamma rays at the ray emission window 250 can be enhanced, and the safety is improved. The shield cover 290 may also be made of lead.

The installation structure of the radiation emission window 250 is: the middle part of the outer side face of the source mounting flange 220 is provided with a ray window hole, the ray window hole is communicated with the central hole of the source mounting flange 220, a circular ray emission window 250 and a ray window pressing ring 221 are arranged in the ray window hole, the ray emission window 250 and the ray window pressing ring 221 are arranged on the same central line, the inner edge of the ray window pressing ring 221 presses the edge of the ray emission window 250, the inner side face of the ray window pressing ring 221 abuts against the hole bottom of the ray window hole and is connected through a bolt, so that the ray emission window 250 is pressed on the hole bottom of the ray window hole, and the central hole of the source mounting flange 220 is shielded in a sealing mode. The outer side face of the ray emission window 250 and the outer side face of the ray window compression ring 221 are both level with the outer side face of the source mounting flange 220.

In order to further enhance the sealing performance, the edge of the outer surface of the ray emission window 250 is matched with the inner edge of the inner surface of the ray window pressing ring 221 in a step mode. The middle of the bottom of the ray window hole protrudes outwards to form a sealing convex ring 222 surrounding the central hole of the source mounting flange 220, the middle of the inner surface of the ray emission window 250 is thinned corresponding to the sealing convex ring 222 to form a counter bore, the bottom of the counter bore abuts against the sealing convex ring 222, and the wall of the counter bore abuts against the annular outer wall of the sealing convex ring 222.

In this embodiment, the source mounting housing 210 is a hollow cylinder with an opening at one end, the source mounting flange 220 is disposed on the opening of the source mounting housing 210, a portion of the source mounting flange 220 facing the inner cavity of the source mounting housing 210 protrudes inward to form a boss 223, and an annular sidewall of the boss 223 abuts against an inner side surface of the opening of the source mounting housing 210. The source mounting flange 220 is bolted to the source mounting housing 210 with the boss 223 abutting the source isolation kit.

The source isolation kit comprises a hollow cylindrical source isolation sleeve 230, an inner cavity of the source isolation sleeve 230 is opened on one end face, an annular source isolation pad 240 is covered on the end face in a buckling mode, the outer diameter of the source isolation pad 240 is equal to that of the source isolation sleeve 230, and the outer cylindrical surfaces of the source isolation pad 240 and the source isolation sleeve 230 are attached to the inner wall cylindrical surface of the source installation shell 210. The source spacer 230 has a shape fitting the source assembly disposed in the inner cavity thereof, and the inner diameter of the source spacer 240 is smaller than the inner diameter of the source spacer 230, so as to confine the source assembly in the source spacer 230.

The inner bore of the source spacer 230 forms the collimating bore 241.

The radioactive source assembly comprises a source installation cabin 260, the outer wall of the source installation cabin 260 is matched with the shape of the inner cavity of the source isolation sleeve 230, a gamma ray radioactive source 280 is arranged in the source installation cabin 260, a ray outlet 261 axially communicated with the collimation hole 241 is formed in the bulkhead of the source installation cabin 260 corresponding to the collimation hole 241, an arrangement hole for the radioactive source 280 to enter the source installation cabin 260 is formed in the bulkhead of the source installation cabin 260, a source set screw 270 is arranged in the arrangement hole, the source set screw 270 is in threaded fit with the arrangement hole, and a source pad 271 is arranged between the stud end of the source set screw 270 and the radioactive source 280.

As shown in fig. 4 and 5, the radiation receiving unit 300 includes a receiving unit housing 310, and the receiving unit housing 310 is opened with a receiving hole 311 and a crystal placing hole. The receiving aperture 311 is sealed by a receiving unit radiation window 330 and the crystal access aperture is covered with a receiving unit flange cover 320, thereby forming a closed cavity within the receiving unit housing 310. A crystal 360 and a crystal positioning component for detecting gamma rays are arranged in the closed cavity, the crystal positioning component positions the crystal 360 in the receiving unit shell 310, and the crystal 360 is opposite to the receiving unit ray window 330.

In this embodiment, the receiving unit housing 310 is cylindrical, an inner wall of one end of the receiving unit housing 310 is radially contracted to form a limiting ring 312, an inner hole of the limiting ring 312 forms the receiving hole 311, and an opening of the other end of the receiving unit housing 310 forms the crystal insertion hole. Receiving unit ray window 330, clamping ring 340 and crystal 360 are arranged in the receiving unit shell 310 in sequence from the receiving hole 311 to the direction of the crystal placing hole, and crystal 360 is also provided with a crystal positioning component to position the crystal 360.

The receiving unit flange cover 320 is connected to the receiving unit housing 310 by bolts, and the inner side surface of the receiving unit flange cover 320 presses the crystal 360, so that the pressing ring 340 presses the edge of the receiving unit ray window 330 against the limiting ring 312.

The outer diameter of the receiving unit ray window 330 is the same as the inner diameter of the receiving unit housing 310, and the outer side surface of the receiving unit ray window 330 is in stepped fit with the limiting ring 312 to improve the assembly sealing performance. The inside surface edge of receiving element ray window 330 forms has annular step, this annular step with clamping ring 340 looks adaptation, clamping ring 340 with be provided with between receiving element flange cover 320 the crystal locating component with crystal 360.

The crystal 360 is cylindrical, with one end facing the receiving unit radiation window 330 and the other end abutting against the inner side of the receiving unit flange cover 320. The crystal positioning assembly includes a resilient crystal holding sleeve 350 and an end positioning ring 321. The crystal fixing sleeve 350 is sleeved on the end of the receiving unit ray window 330 facing the crystal 360, the crystal fixing sleeve 350 is clamped between the inner wall of the receiving unit casing 310 and the circumferential surface of the outer wall of the crystal 360, the crystal fixing sleeve 350 faces one end of the pressing ring 340, an elastic ring pad 351 is integrally formed, and the elastic ring pad 351 is clamped between the pressing ring 340 and the end face of the receiving unit ray window 330 facing the crystal 360. The crystal 360 is protected by the elasticity of the crystal fixing sleeve 350 and the elastic ring pad 351.

The end positioning ring 321 is sleeved on the end of the crystal 360 close to the receiving unit flange cover 320, and the outer wall of the end positioning ring 321 is attached to the inner wall of the receiving unit housing 310.

The end positioning ring 321 and the crystal holding sleeve 350 fix their radial positions from both ends of the crystal 360, respectively.

The end positioning ring 321 is integrally formed on the inner side surface of the receiving unit flange cover 320, a ring groove is formed in the circumferential surface of the outer wall of the end positioning ring 321, a sealing ring 322 is arranged in the ring groove, and the end positioning ring 321 and the contact surface between the receiving unit shells 310 are sealed by the sealing ring 322.

The ray transmitting unit 200 and the ray receiving unit 300 are compact in structure, good in sealing performance and convenient to use underwater.

The above-mentioned radiation emitting unit 200 and radiation receiving unit 300 can be used for a water leakage detector for a jacket of an offshore platform, which comprises an adjusting frame, the radiation emitting unit 200 as described above, and the radiation receiving unit 300. The adjusting frame is an open frame with an opening, as shown in fig. 6, the adjusting frame includes a main body support 110 and two support arms 120, the two support arms 120 are arranged in parallel and opposite to each other, the same end of the two support arms 120 is connected with the main body support 110, and the other ends of the two support arms 120 extend out to the same side of the main body support 110, so as to form the adjusting frame with an opening on one side with the main body support 110. One of the support arms 120 is provided with a ray emitting unit 200, the other support arm 120 is provided with a ray receiving unit 300, and a ray emitting window 250 of the ray emitting unit 200 is opposite to a ray window 330 of the ray receiving unit 300.

During detection, the protective cover 290 is removed, the ROV robot or diver pushes the opening of the adjusting frame of the detector to face the conduit to be detected, and the ray transmitting unit 200 and the ray receiving unit 300 are respectively positioned at two sides of the central line of the conduit, and then detection is performed, as shown in fig. 6. The radiation emitting unit 200 and the radiation receiving unit 300 are adjusted to appropriate positions as necessary. After passing through the measured catheter, the gamma ray beam emitted by the ray emitting unit 200 is received by the ray receiving unit 300. The detector is adopted to test under the experimental condition of simulating the underwater environment of the guide pipe in advance, the relation between the intensity of the received ray bundle and the intensity of the emitted ray bundle is obtained, and the internal parameter standard is formed. During underwater detection, whether water enters the conduit or not is inferred according to the attenuation of the received ray beam intensity relative to the emitted ray beam intensity, compared with an internal parameter standard, and combined with known substance-related characteristic parameters between the ray emitting unit 200 and the ray receiving unit 300.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims

1. A radiation transmitting and receiving apparatus comprising a radiation transmitting unit (200) and a radiation receiving unit (300), characterized in that: the radiation emission unit (200) comprises a source mounting shell (210) with an opening, wherein an active mounting flange (220) is arranged on the opening of the source mounting shell (210), a radiation emission window (250) is arranged on the source mounting flange (220), and the radiation emission window (250) seals a central hole of the source mounting flange (220), so that the source mounting shell (210), the source mounting flange (220) and the radiation emission window (250) form a sealing system;

a radioactive source assembly is arranged in the source installation shell (210), a source isolation suite made of ray absorption materials is coated outside the radioactive source assembly, a collimation hole (241) is formed in the source isolation suite, the center hole of the source isolation suite is opposite to the source installation flange (220), and the collimation hole (241) is communicated with the center hole in a hole-sharing mode;

the ray receiving unit (300) comprises a receiving unit shell (310), wherein a receiving hole (311) and a crystal placing hole are formed in the receiving unit shell (310), the receiving hole (311) is sealed by a receiving unit ray window (330), a receiving unit flange cover (320) covers the crystal placing hole, and therefore a closed cavity is formed in the receiving unit shell (310), and a crystal (360) is arranged in the closed cavity;

in the working state, the ray window (330) of the receiving unit is opposite to the ray transmitting window (250).

2. The radiation transmitting and receiving device of claim 1, wherein: the receiving unit shell (310) is cylindrical, the inner wall of one end of the receiving unit shell (310) is radially contracted to form a limiting ring (312), the inner hole of the limiting ring (312) forms the receiving hole (311), and the other end of the receiving unit shell (310) is opened to form the crystal placing hole;

a receiving unit ray window (330), a pressing ring (340) and a crystal (360) are sequentially arranged in the receiving unit shell (310) from the receiving hole (311) to the direction of the crystal placing hole, a crystal positioning component is arranged outside the crystal (360), and the crystal positioning component positions the crystal (360) to enable the crystal to be opposite to the receiving unit ray window (330);

the receiving unit flange cover (320) is connected with the receiving unit shell (310) through bolts, and the inner side face of the receiving unit flange cover (320) presses the crystal (360) so that the pressing ring (340) can press the edge of the receiving unit ray window (330) on the limiting ring (312).

3. A radiation transmitting and receiving device according to claim 1 or 2, wherein: the source mounting flange (220) is detachably buckled with a protective cover (290) made of a ray absorption material, and the protective cover (290) shields the source mounting flange (220) and the ray emission window (250).

4. The radiation transmitting and receiving device of claim 3, wherein: the protective cover (290) covers the source mounting flange (220) and covers the butt joint face of the source mounting flange (220) and the source mounting shell (210).

5. The radiation transmitting and receiving device of claim 4, wherein: the center of the protecting cover (290) is thickened to form a protecting circular truncated cone (291), the protecting circular truncated cone (291) is located on the outer side face of the protecting cover (290), and the diameter of the protecting circular truncated cone (291) is not smaller than the aperture of the collimation hole (241).

6. The radiation transmitting and receiving device of claim 5, wherein: a ray aperture hole is formed in the middle of the outer side face of the source mounting flange (220), the ray aperture hole is communicated with the central hole of the source mounting flange (220), a circular ray emission window (250) and a ray window pressing ring (221) are arranged in the ray aperture hole, the ray emission window (250) and the ray window pressing ring (221) are arranged on the same central line, the inner edge of the ray window pressing ring (221) presses the edge of the ray emission window (250), and the inner side face of the ray window pressing ring (221) abuts against the hole bottom of the ray aperture hole and is connected through a bolt so that the ray emission window (250) is pressed on the hole bottom of the ray aperture hole, and the central hole of the source mounting flange (220) is sealed and shielded;

the outer side face of the ray emission window (250) and the outer side face of the ray window pressure ring (221) are both level with the outer side face of the source mounting flange (220).

7. The radiation transmitting and receiving device of claim 6, wherein: the edge of the outer surface of the ray emission window (250) is matched with the inner edge of the inner surface of the ray window compression ring (221) in a step manner;

the middle part of the bottom of the ray window hole protrudes outwards to form a sealing convex ring (222) surrounding the central hole of the source mounting flange (220), the middle part of the inner surface of the ray transmitting window (250) is thinned corresponding to the sealing convex ring (222) to form a counter bore, the bottom of the counter bore abuts against the sealing convex ring (222), and the wall of the counter bore abuts against the annular outer wall of the sealing convex ring (222).

8. The radiation transmitting and receiving device of claim 7, wherein: the source installation shell (210) is in a hollow cylinder shape with an opening at one end, the source installation flange (220) is arranged on the opening of the source installation shell (210), the part, facing the inner cavity of the source installation shell (210), of the source installation flange (220) protrudes inwards to form a boss (223), and the annular side wall of the boss (223) abuts against the inner side surface of the opening of the source installation shell (210);

the source mounting flange (220) is bolted to the source mounting housing (210) with the boss (223) abutting the source isolation kit.

9. The radiation transmitting and receiving device of claim 8, wherein: the source isolation kit comprises a hollow cylindrical source isolation sleeve (230), an inner cavity of the source isolation sleeve (230) is opened on one end face, an annular source isolation pad (240) is covered on the end face in a buckling mode, the outer diameter of the source isolation pad (240) is equal to that of the source isolation sleeve (230), and the outer cylindrical surfaces of the source isolation pad (240) and the source isolation sleeve (230) are attached to the cylindrical surface of the inner wall of the source installation shell (210);

the inner cavity of the source isolation sleeve (230) is internally provided with the radiation source assembly matched with the shape of the source isolation sleeve, and the inner diameter of the source isolation pad (240) is smaller than that of the source isolation sleeve (230) so as to limit the radiation source assembly in the source isolation sleeve (230);

the inner bore of the source spacer (230) forms the collimating bore (241).

10. The radiation transmitting and receiving device of claim 9, wherein: the radioactive source assembly comprises a source installation cabin (260), the outer wall of the source installation cabin (260) is matched with the shape of an inner cavity of the source isolation sleeve (230), a radioactive source (280) is arranged in the source installation cabin (260), a bulkhead of the source installation cabin (260) corresponding to the alignment hole (241) is provided with a ray outlet hole (261) axially communicated with the alignment hole (241), a bulkhead of the source installation cabin (260) opposite to the alignment hole (241) is provided with an arrangement hole for the radioactive source (280) to enter the source installation cabin (260), a source set screw (270) is arranged in the arrangement hole, the source set screw (270) is in threaded fit with the arrangement hole, and a source pad (271) is arranged between the screw column end of the source set screw (270) and the radioactive source (280).