Vibration reduction mounting structure of crystal and photomultiplier

Abstract

The utility model relates to a vibration reduction mounting structure of a crystal and a photomultiplier. The vibration reduction mounting structure comprises a tube shell, an inner tube, the photomultiplier, the crystal, an upper joint and a sealing seat, the tube shell is provided with a cavity with an opening at one end, the inner tube is arranged in the cavity of the tube shell, the inner tube is provided with a cavity with openings at two ends, the photomultiplier and the crystal are adjacently arranged in the cavity of the inner tube, and a first anti-vibration pad is arranged between the photomultiplier and the crystal; the upper connector is arranged at the open end of the tube shell and stretches into the tube shell, the inner tube is movably connected with the upper connector through an elastic piece, and the moving direction of the inner tube is parallel to the body length direction of the tube shell. The sealing seat and the elastic piece are respectively positioned at two opposite ends of the inner pipe; more than two second anti-vibration pads are arranged between the tube shell and the inner tube; and more than two third anti-vibration pads are arranged between the inner tube and the photomultiplier as well as between the inner tube and the crystal. According to the invention, vibration reduction processing is carried out in multiple directions of the photomultiplier and the crystal, so that a better buffer protection effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of well logging technology, and in particular to a vibration reduction mounting structure for a crystal and a photomultiplier tube. Background Art

[0002] Sodium iodide crystals and photomultiplier tubes, as key components inside gamma logging instruments, play an important role in logging. However, the photomultiplier tubes and sodium iodide crystals in the gamma detector are fragile items. When the instrument is involved in drilling operations, the photomultiplier tubes or crystals often break due to large vibrations. In particular, the vibration of the horizontal well probe is more serious, which in turn affects the accuracy of gamma logging. In severe cases, logging cannot be carried out. How to effectively reduce the vibration of the sodium iodide crystals and photomultiplier tubes inside the gamma logging instrument during logging has become an urgent problem that needs to be solved. Summary of the Invention

[0003] In view of this, the present application proposes a vibration reduction mounting structure for a crystal and a photomultiplier tube.

[0004] According to one aspect of the present application, a vibration reduction mounting structure for a crystal and a photomultiplier tube is provided, characterized in that it comprises: a tube shell, an inner tube, a photomultiplier tube, a crystal, an upper joint and a sealing seat;

[0005] The tube shell is provided with a cavity with one end open, and the inner tube is arranged inside the cavity of the tube shell.

[0006] The inner tube is provided with a cavity with two ends opened, the photomultiplier tube and the crystal are adjacently arranged inside the cavity of the inner tube, and a first vibration damping pad is provided between the photomultiplier tube and the crystal;

[0007] The upper joint is arranged at one end of the opening of the tube shell and extends into the tube shell. The inner tube is movably connected to the upper joint through an elastic member, and the movable direction of the inner tube is parallel to the length direction of the tube shell.

[0008] The sealing seat and the elastic member are respectively located at two opposite ends of the inner tube;

[0009] More than two second vibration damping pads are arranged between the tube shell and the inner tube; more than two third vibration damping pads are arranged between the inner tube and the photomultiplier tube and the crystal.

[0010] In a possible implementation, it further includes: a multiplier tube base; the multiplier tube base is arranged inside the cavity of the inner tube, and one end of the photomultiplier tube away from the crystal is connected to the multiplier tube base.

[0011] In a possible implementation, it further includes: a support base; the support base is fixedly disposed inside the cavity of the inner tube, and the support base and the photomultiplier tube are respectively located on opposite sides of the multiplier tube base.

[0012] In a possible implementation, the elastic member is a spring; one end of the spring is connected to the upper joint, and the other end of the spring is connected to the support seat.

[0013] In a possible implementation, a limiting member is provided at one end of the upper joint that extends into the inner tube, and an elongated limiting hole is opened on the side wall of the inner tube, and the limiting member extends into the limiting hole.

[0014] In a possible implementation, it further includes: an isolation vibration damping seat; the isolation vibration damping seat is arranged inside the cavity of the inner tube and is located between the crystal and the sealing seat.

[0015] In a possible implementation, two or more first sealing rings are provided between the upper connector and the tube shell.

[0016] In a possible implementation, a second sealing ring is provided between the sealing seat and the tube shell.

[0017] In a possible implementation, three second vibration-damping pads are provided.

[0018] In a possible implementation, three third vibration-damping pads are provided.

[0019] Beneficial effect: When a strong collision occurs as a whole, the elastic part can provide sufficient buffer space for the inner tube, reduce the acceleration and impact force generated during the collision, and effectively protect the photomultiplier tube and crystal in the inner tube from vibration. A certain preset distance is set between the tube shell and the inner tube, and a second vibration-damping pad is set between the tube shell and the inner tube, which can effectively prevent the transmission of vibration from the tube shell to the inner tube. A certain preset distance is set between the inner tube and the photomultiplier tube and the crystal and two or more third vibration-damping pads are set, which can effectively prevent the transmission of vibration from the inner tube to the photomultiplier tube and the crystal; the overall structure of the present application is compact, and vibration reduction treatment is carried out in multiple directions of the photomultiplier tube and the crystal, thereby playing a better buffering and protective role, and effectively improving the service life of the natural gamma ray logging instrument.

[0020] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0022] Figure 1 A cross-sectional view showing a vibration reduction mounting structure of a crystal and a photomultiplier tube according to an embodiment of the present application;

[0023] Figure 2 Show Figure 1 A partial enlarged view of

[0024] Figure 3 Show Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0025] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0026] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0028] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0029] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0030] Figure 1 A cross-sectional view showing a vibration reduction mounting structure of a crystal and a photomultiplier tube according to an embodiment of the present application; Figure 2 Show Figure 1 A partial enlarged view of Figure 3 Show Figure 1 A partial enlarged view of the Figure 1As shown, the vibration-damping mounting structure of the crystal and the photomultiplier tube comprises: a tube shell 100, an inner tube 200, a photomultiplier tube 500, a crystal 600, an upper joint 300 and a sealing seat; the tube shell 100 is provided with a cavity with two ends open, the inner tube 200 is arranged inside the cavity of the tube shell 100, the inner tube 200 is provided with a cavity with two ends open, the photomultiplier tube 500 and the crystal 600 are adjacently arranged inside the cavity of the inner tube 200, and a first vibration-damping pad 510 is provided between the photomultiplier tube 500 and the crystal 600; the upper joint The head 300 is disposed at one open end of the tube shell 100 and extends into the tube shell 100. The inner tube 200 is movably connected to the upper head 300 via an elastic member 900, and the movable direction of the inner tube 200 is parallel to the length direction of the tube shell 100. The sealing seat and the elastic member 900 are respectively located at opposite ends of the inner tube 200. Two or more second vibration-damping pads 220 are provided between the tube shell 100 and the inner tube 200. Two or more third vibration-damping pads 210 are provided between the inner tube 200 and the photomultiplier tube 500 and the crystal 600.

[0031] Here, it should be noted that the tube shell 100 is suitable for providing installation space for the internal equipment and isolating and protecting the internal equipment, and the inner tube 200 is suitable for further isolating and protecting the internal photomultiplier tube 500 and crystal 600. The double-wall protection setting makes the vibration reduction and temperature insulation performance of the overall equipment more superior; the first vibration damping pad 510 between the photomultiplier tube 500 and the crystal 600 is suitable for effectively isolating the photomultiplier tube 500 and the crystal 600 to avoid direct contact between the two and causing bumps and wear; the inner tube 200 is movably connected to the upper joint 300 through an elastic member 900. When the whole is strongly impacted, the elastic member 900 can provide sufficient buffer space for the inner tube 200, reduce the acceleration and impact force generated during the collision, thereby effectively reducing the photomultiplier tube 500 and crystal 600 in the inner tube 200 Vibration protection, the sealing seat is suitable for sealing the inner tube 200, limiting the position of the photomultiplier tube 500 and the crystal 600, and preventing the equipment in the inner tube 200 from moving; a certain preset distance is provided between the tube shell 100 and the inner tube 200, and a second vibration damping pad 220 is provided between the tube shell 100 and the inner tube 200, which can effectively prevent the transmission of vibration from the tube shell 100 to the inner tube 200, and a certain preset distance is provided between the inner tube 200 and the photomultiplier tube 500 and the crystal 600 and two or more third vibration damping pads 210, which can effectively prevent the transmission of vibration from the inner tube 200 to the photomultiplier tube 500 and the crystal 600; the overall structure of the present application is compact, and vibration damping treatment is carried out in multiple directions of the photomultiplier tube 500 and the crystal 600, thereby playing a better buffering protection role and effectively improving the service life of the natural gamma ray logging instrument.

[0032] In one possible implementation, the main body of the housing 100 is a circular tubular structure, and the main body of the inner tube 200 is a circular tubular structure with openings at both ends. The housing 100 is sleeved outside the inner tube 200, with the length of the housing 100 parallel to the length of the inner tube 200. Furthermore, the photomultiplier tube 500 is positioned near the upper connector 300, and the crystal 600 is positioned near the sealing seat.

[0033] Furthermore, the outer tube 100 is made of TC4, has an inner diameter of 42 mm, an outer diameter of 50 mm, and a length of 480 mm. The inner tube 200 is made of 2A12, natural oxidation treated, has an inner diameter of 32 mm, an outer diameter of 38 mm, and a length of 360 mm.

[0034] In one possible implementation, the apparatus further includes a multiplier tube base 700 disposed within the cavity of the inner tube 200, and connected to the multiplier tube base 700 at one end of the photomultiplier tube 500 away from the crystal 600. The multiplier tube base 700 has a protruding outer surface provided with an abutment portion adapted to connect to the support base 800.

[0035] In a possible implementation, it further includes: a support seat 800; the support seat 800 is fixedly arranged inside the cavity of the inner tube 200, and the support seat 800 and the photomultiplier tube 500 are respectively located on opposite sides of the multiplier tube base 700. Here, it should be noted that the main body of the support seat 800 is a tubular structure, and one end of the multiplier tube base 700 is embedded in the inner side of the support seat 800, so that the abutment portion and the support seat 800 are in contact with each other. The support seat 800 and the multiplier tube base 700 are fixedly connected by screws, such as Figure 2 As shown, a screw hole 830 is opened on the side wall of the support base 800, and a screw hole 710 is opened on the side wall of the multiplier tube base 700. When the two screw holes are opposite to each other, screws are screwed in to achieve a fixed connection between the support base 800 and the multiplier tube base 700.

[0036] In a possible implementation, the inner tube 200 and the support base 800 are fixedly connected by screws 810, such as Figure 1 As shown, the support base 800 is provided with a screw hole, and the side wall of the inner tube 200 is also provided with a screw hole. When the two screw holes are aligned, screws 810 are screwed in to securely connect the inner tube 200 to the support base 800. Under the clamping and limiting action of the support base 800 and the sealing base, the photomultiplier tube 500 and crystal 600 in the inner tube 200 can be fixed in position to prevent collisions between the two due to unstable fixation.

[0037] In one possible implementation, the elastic member 900 is a spring; one end of the spring is connected to the upper joint 300, and the other end of the spring is connected to the support seat 800. It should be noted that a spring slot is provided at one end of the upper joint 300 that penetrates the inner tube 200, and the spring is embedded in the spring slot and connected to the upper joint 300. The provision of the spring slot can improve the installation stability of the spring. The other end of the spring is connected to the side wall of the support seat 800. When the inner tube 200 drives the internal photomultiplier tube 500 and crystal 600 toward the side of the upper joint 300, the spring undergoes compression deformation, thereby achieving buffering and vibration reduction of the inner tube 200.

[0038] Preferably, the material of the spring is: 65Mn; wire diameter d=2mm; median diameter D=20mm; pitch P=8mm; stiffness K=6.54; and free height is 31mm.

[0039] In one possible implementation, a stopper 231 is provided at one end of the upper connector 300 that extends into the inner tube 200. An elongated stopper hole 230 is provided on the sidewall of the inner tube 200, and the stopper 231 extends into the stopper hole 230. It should be noted that to prevent the photomultiplier tube 500 and crystal 600 from striking the upper cover at one end of the tube housing 100 due to excessive spring return, the stopper hole 230 is provided in the inner tube 200, and the stopper 231 is provided on the upper connector 300. This allows the stopper 231 to move relative to the inner tube 200 only within the range of the stopper hole 230, thereby limiting the spring deformation (vibration damping stroke) and preventing excessive spring compression and return.

[0040] Preferably, the limiting member 231 can be a screw, which penetrates the side wall of the upper joint 300 and protrudes relative to the side wall of the upper joint 340. The moving distance of the limiting member 231 in the limiting hole 230 is 10 mm.

[0041] In a possible implementation, it further includes: an isolation and vibration damping seat 430; the isolation and vibration damping seat 430 is arranged inside the cavity of the inner tube 200 and is located between the crystal 600 and the sealing seat. Here, it should be noted that the isolation and vibration damping seat 430 serves as a connecting bridge between the sealing seat and the crystal 600, plays the role of isolation and vibration reduction, and avoids impact wear caused by direct contact between the crystal 600 and the sealing seat. Figure 1 As shown, the main body of the isolation and vibration damping seat 430 is a columnar structure, with one side connected to the crystal 600 and the other side connected to the sealing seat. The outer diameter of the isolation and vibration damping seat 430 matches the inner diameter of the inner tube 200, and the outer wall of the isolation and vibration damping seat 430 is in direct contact with the inner tube 200.

[0042] Preferably, the material of the isolation and vibration damping seat 430 is silicone; the Shore hardness range is 35±5°; the thickness is 15 mm; and the inner diameter is 10 mm.

[0043] In a possible implementation, the sealing seat includes: a locking nut 410 and a threaded sleeve 400, such as Figure 1 As shown, one end of the sleeve 400 is embedded in the inner tube 200, the outer side wall of the sleeve 400 is provided with a screw hole, and the inner tube 200 is provided with a screw hole. The screw 440 is screwed into the two screw holes to achieve a fixed connection between the sleeve 400 and the inner tube 200, the inner side wall of the sleeve 400 is provided with a threaded structure, and the outer side wall of the locking nut 410 is provided with a matching threaded structure, the locking nut 410 is screwed into the inner side of the sleeve 400 and is threadedly connected to the sleeve 400, and one end of the locking nut 410 is in contact with the isolation and vibration damping seat 430, thereby achieving locking and fixation of the isolation and vibration damping seat 430.

[0044] In a possible implementation, a second sealing ring 420 is provided between the sealing seat and the tube shell 100. Figure 3 As shown, a sealing ring placement groove is provided on the outer wall of the screw sleeve 400 of the sealing seat, and the second sealing ring 420 is embedded in the sealing ring placement groove. The inner and outer sides of the second sealing ring 420 are tightly fitted with the screw sleeve 400 and the tube shell 100 respectively, thereby achieving the sealing effect of the second sealing ring 420.

[0045] In a possible implementation, two or more first sealing rings 310 are provided between the upper connector 300 and the tube shell 100. Figure 2 As shown, a sealing ring placement groove is defined on the outer wall of the upper joint 300. The sealing ring placement groove matches the first sealing ring 310. The first sealing ring 310 is sleeved on the outer side of the upper joint 300 and embedded in the sealing ring placement groove. The sealing effect of the first sealing ring 310 improves the sealing performance of the connection between the upper joint 300 and the tube shell 100, preventing impurities from falling into the tube shell 100 through the upper joint 300. Preferably, two first sealing rings 310 are provided between the upper joint 300 and the tube shell 100.

[0046] In a possible implementation, there are three second vibration damping pads 220. The three second vibration damping pads 220 are arranged in sequence along the length direction of the inner tube 200, as shown in FIG. Figure 1 As shown, the main body of the second vibration damping pad 220 is annular in structure. Three vibration damping pad placement grooves are defined on the outer wall of the inner tube 200. The inner sides of the second vibration damping pads 220 are embedded in the grooves, and the outer sides of the second vibration damping pads 220 contact the inner sidewall of the tube housing 100. The provision of the vibration damping pad placement grooves ensures that the positions of the three second vibration damping pads 220 remain unchanged, preventing them from shifting during movement of the inner tube 200.

[0047] Preferably, the second vibration damping pad 220 is made of silicone; has a Shore hardness of 35±5°; has a thickness of 2.5 mm; an inner diameter of 35 mm; and an outer diameter of 40 mm.

[0048] In one possible implementation, three third vibration damping pads 210 are provided. The three third vibration damping pads 210 are arranged in sequence along the length of the inner tube 200. The main bodies of the three third vibration damping pads 210 are all annular in structure, with one being mounted on the outside of the photomultiplier tube 500, one being mounted at the connection between the photomultiplier tube 500 and the crystal 600, and the other being mounted on the outside of the crystal 600.

[0049] Preferably, the third vibration damping pad 210 is made of silicone; has a Shore hardness of 35±5°; has a thickness of 2 mm; an inner diameter of 26 mm; and an outer diameter of 30 mm.

[0050] Preferably, the first vibration damping pad 510 is an optical silicone pad with a Shore hardness range of 35±5° and a thickness of 2 mm.

[0051] In one possible implementation, the housing 100 is provided with an upper cover 110; the upper cover 110 and the upper connector 300 are located at either end of the housing 100. The upper cover 110 is embedded in the open end of the housing 100 and is suitable for sealing the other end opening of the housing 100. The upper cover and the housing 100 can be further reinforced by screws.

[0052] It should be noted that the upper connector 300 is provided with a central hole 320, and the support base 800 is provided with a central hole 820. Both central holes are located on the same axis, so that the wires of the photomultiplier tube 500 can be electrically connected to external devices through the two central holes in sequence. The working principle of the photomultiplier tube 500 and crystal 600 of this application is explained here: Rocks generally contain varying amounts of radioactive elements and continuously emit radiation. For example, in igneous rocks, the more acidic the rock, the greater the radioactivity; in sedimentary rocks, the more muddy the rock, the stronger the radioactivity. When the crystal 600 is exposed to radiation (such as gamma rays or neutrons), it absorbs the radiation energy and subsequently releases photons. These photons are reflected multiple times in the crystal 600 and converted into electrical signals by the photomultiplier tube 500. By measuring the intensity of the electrical signal, the intensity and type of radiation can be determined, facilitating the demarcation of the geological profile of the borehole, determining the sandstone mud content in the sandstone mudstone profile, and qualitatively determining the permeability of the rock formation.

[0053] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A vibration reduction mounting structure for a crystal and a photomultiplier tube, characterized in that: include: Tube shell, inner tube, photomultiplier tube, crystal, upper connector and sealing seat; The tube shell is provided with a cavity with two ends open, and the inner tube is arranged inside the cavity of the tube shell; The inner tube is provided with a cavity with two ends open, the photomultiplier tube and the crystal are arranged adjacent to each other inside the cavity of the inner tube, and a first vibration damping pad is provided between the photomultiplier tube and the crystal; The upper joint is arranged at one end of the opening of the tube shell and extends into the tube shell. The inner tube is movably connected to the upper joint via an elastic member, and the movable direction of the inner tube is parallel to the length direction of the tube shell. The sealing seat and the upper joint are respectively located at opposite ends of the inner tube; More than two second vibration damping pads are provided between the tube shell and the inner tube; more than two third vibration damping pads are provided between the inner tube and the photomultiplier tube and the crystal.

2. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 1, characterized in that: Also includes: Multiplier tube base; The multiplier tube base is arranged inside the cavity of the inner tube, and one end of the photomultiplier tube away from the crystal is connected to the multiplier tube base.

3. The vibration reduction mounting structure for the crystal and photomultiplier tube according to claim 2, characterized in that: Also includes: Support seat; the support seat is fixedly arranged inside the cavity of the inner tube, and the support seat and the photomultiplier tube are respectively located on opposite sides of the multiplier tube base.

4. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 3, characterized in that: The elastic member is a spring; one end of the spring is connected to the upper joint, and the other end of the spring is connected to the support seat.

5. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 4, characterized in that: A limiting piece is provided at one end of the upper joint that protrudes into the inner tube, and a long limiting hole is opened on the side wall of the inner tube, and the limiting piece protrudes into the limiting hole.

6. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 1, characterized in that: Also includes: Isolation and vibration damping seat; the isolation and vibration damping seat is arranged inside the cavity of the inner tube and is located between the crystal and the sealing seat.

7. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 1, characterized in that: More than two first sealing rings are provided between the upper joint and the tube shell.

8. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 7, characterized in that: A second sealing ring is provided between the sealing seat and the tube shell.

9. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 1, characterized in that: There are three second vibration-damping pads.

10. The vibration reduction mounting structure for a crystal and a photomultiplier tube according to claim 1, wherein: There are three third vibration-damping pads.

Images