Lead spring structure low-distortion geophone

Abstract

The utility model relates to the technical field of geophysical exploration, and provides a low-distortion geophone with a lead spring structure, which comprises an insulator, a top cover, a coil holder, a clamp spring, an enameled wire, a shell, a sealing ring, a bottom cover, a lower magnetic boot and an upper magnetic boot, and is characterized by further comprising two lead springs, and two ends of each lead spring are respectively arranged on the top cover and the enameled wire; the upper spring piece and the lower spring piece are arranged in the shell, and a plurality of gaps with non-uniform shapes are formed in the upper spring piece and the lower spring piece. By means of the technical scheme, the problems that in the prior art, an elastic contact type low-frequency high-sensitivity geophone is not environmentally friendly in the machining process, low in reliability, large in distortion degree, high in production cost and the like are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of geophysical exploration, and in particular to a low-distortion seismic geophone with a lead spring structure. Background Art

[0002] To meet the development needs of high-precision, high-density, broadband, and low-cost seismic exploration technology, a large number of single-point, low-frequency, high-sensitivity geophones have been introduced in recent years. While these current single-point, low-frequency, high-sensitivity geophones offer significant advantages for meeting the requirements of broadband, high-efficiency, and environmentally friendly oil and gas exploration, they still face significant challenges in meeting the demands of high-precision, high-density, and low-cost seismic exploration, particularly in effectively acquiring high-fidelity, high-resolution, and high-dynamic seismic data. For example, traditional low-frequency, high-sensitivity geophones mostly utilize an elastic contact method to output seismic waves. This leads to high manufacturing costs, environmentally unfriendly processes, weak fidelity, and poor reliability, resulting in suboptimal practical applications and making them particularly difficult to meet the demands of high-precision, low-cost seismic exploration.

[0003] Therefore, if a low-distortion, high-sensitivity seismic detector with a new structure and process technology can be invented based on the traditional elastic contact low-frequency, high-sensitivity seismic detector, the inherent problems of the existing elastic contact low-frequency, high-sensitivity seismic detector can be fundamentally solved, and more advanced economic and technical indicators can be achieved, then a new option will be provided for high-precision, low-cost oil and gas seismic data acquisition.

[0004] The technical approach of this utility model is based on existing elastic contact low-frequency, high-sensitivity geophones, aiming to achieve low cost, high precision, high reliability, and environmentally friendly processes. Through improvements to the lead spring structure, magnetic circuit, spring plate, and processing technology, a geophone with low natural frequency, high sensitivity, low distortion, excellent reliability, and economical applicability has been developed. This utility model not only solves the inherent problems of existing elastic contact low-frequency, high-sensitivity geophones, but also provides a critical foundation for high-precision, broadband, and low-cost oil and gas seismic exploration. Utility Model Content

[0005] The utility model provides a low-distortion seismic geophone with a lead spring structure, which solves the problems of environmental pollution in the processing of elastic contact low-frequency high-sensitivity seismic geophones in related technologies, low reliability, high distortion and high production cost.

[0006] The technical solution of the utility model is as follows:

[0007] A low-distortion seismic geophone with a lead spring structure includes: an insulator, a top cover, a wire rack, a retaining spring, an enameled wire, a housing, a sealing ring, a bottom cover, a lower magnetic shoe, an upper magnetic shoe, and further includes:

[0008] There are two lead springs, with two ends respectively provided on the top cover and the enameled wire;

[0009] The upper spring piece and the lower spring piece are arranged in the shell, and the upper spring piece and the lower spring piece are provided with a plurality of gaps of uneven shapes.

[0010] As a further technical solution, the lead spring is made of multiple strands of fine metal wires that are soft and conductive, and have appropriate length and pitch.

[0011] As a further technical solution, it also includes:

[0012] A magnetic steel is disposed in the housing, and the magnetic steel is located between the upper magnetic shoe and the lower magnetic shoe;

[0013] The magnetic ring is sleeved on the magnetic steel, and the magnetic steel, the magnetic ring, the upper magnetic shoe and the lower magnetic shoe jointly generate a magnetic circuit.

[0014] As a further technical solution, the magnetic steel is made based on the strong magnetic material of neodymium iron boron.

[0015] As a further technical solution, the upper magnetic shoe and the lower magnetic shoe are asymmetrically designed.

[0016] As a further technical solution, the height of the magnetic steel is modified from the original 20.5 mm to 9-10 mm.

[0017] As a further technical solution, the width of the wire groove for winding the enameled wire is modified from 9.5 mm to 6.0-6.2 mm.

[0018] The beneficial effects of the utility model are:

[0019] This utility model replaces the traditional elastic contact output with a lead spring structure output, simplifying the signal output path, stabilizing the connection relationship, and eliminating the gold plating process, thereby improving the reliability of the seismic detector while reducing processing and manufacturing costs. By selecting extremely magnetic neodymium iron boron materials, asymmetrically designing the upper and lower magnetic shoes, and improving the manufacturing process, a linear magnetic field with a more even distribution of magnetic lines of force is constructed, expanding the linear motion range of the inertial body. By separately designing the upper and lower spring leaves, and using an irregularly shaped rib and uneven gap manufacturing process, a spring body with a stable elastic coefficient, highly consistent performance, and strong impact resistance is produced, ensuring a good linear relationship between the force applied to the inertial body and the relative displacement.

[0020] Previous low-frequency, high-sensitivity geophones typically used spring contacts to output coil-induced signals, requiring a gold-plating process. This not only increased production costs and environmental pollution, but also could lead to momentary contact failure due to external forces. The geophone provided by the present utility model is the first low-frequency geophone to use a spring-loaded output structure instead of a spring-loaded one. This not only eliminates the gold-plating process and reduces environmental pollution, but more importantly, ensures contact-free operation under all conditions, guaranteeing the continuity of seismic signal output. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0022] Figure 1 This is a schematic diagram of the core structure of the seismic geophone proposed in the present utility model;

[0023] Figure 2 This is a schematic diagram of the lead spring structure of the seismic geophone proposed in the present utility model;

[0024] Figure 3 This is a schematic diagram of the upper spring plate structure of the seismic geophone proposed in the present utility model;

[0025] Figure 4 This is a schematic diagram of the lower spring piece structure of the seismic geophone proposed in the present utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the magnetic circuit of the existing seismic geophone of the present invention;

[0027] Figure 6 This is a structural diagram of the improved magnetic circuit of the seismic geophone of the present utility model.

[0028] In the figure: 1. Insulator, 2. Top cover, 3. Wire rack, 4. Retaining spring, 5. Enameled wire, 6. Housing, 7. Lower spring sheet, 8. Sealing ring, 9. Bottom cover, 10. Lower magnetic shoe, 11. Magnet, 12. Magnetic ring, 13. Upper magnetic shoe, 14. Upper spring sheet, 15. Lead spring. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, they can also be understood as further technical solutions without paying creative work. In some figures, components with the same structure or function are schematically illustrated, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0030] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] Reference Figures 1 to 6 , which is the first embodiment of the utility model, proposes a low-distortion seismic detector with a lead spring 15 structure, including: an insulator 1, a top cover 2, a wire rack 3, a retaining spring 4, an enameled wire 5, a shell 6, a sealing ring 8, a bottom cover 9, a lower magnetic shoe 10, and an upper magnetic shoe 13. It is characterized in that it also includes: two lead springs 15, with their ends respectively arranged on the top cover 2 and the enameled wire 5; an upper spring leaf 14 and a lower spring leaf 7, which are arranged in the shell 6, and have a plurality of unevenly shaped gaps on the upper spring leaf 14 and the lower spring leaf 7.

[0033] In this embodiment, a low-distortion seismic geophone with a lead spring 15 structure is described. It comprises an insulating terminal for outputting seismic signals, a top cover 2 that constrains and protects the core, a coil bobbin for winding the coil and positioning the output pole, a retaining spring 4 that secures an upper spring leaf 14, a coil wound with conductive enameled wire 5 as the inertial body, a metal housing 6 that constrains and protects the core structure, a lower spring leaf 7 that supports the coil and enables relative motion, a seal that isolates it from the external environment, a bottom cover 9 that supports and protects the core, a lower magnetic shoe 10 that guides magnetic flux, a magnet 11 that generates a magnetic field, a magnetic ring 12 that compensates for the temperature characteristics of the magnetic field, an upper magnetic shoe 13 that guides magnetic flux, an upper spring leaf 14 that constrains the coil and enables relative motion, and a lead spring 15 that bridges the coil's inductive output to the insulating terminal. The coil bobbin and coil are the fundamental components of the inertial body. When seismic waves reach the coil, the upper and lower spring leaves 7 cause relative motion with the magnetic circuit, thereby cutting the magnetic flux and inducing an electromotive force. The key characteristics of the coil bobbin are excellent magnetic permeability, lightweight and durable material, and consistent dimensions, maintaining a constant weight and stroke. The coil's base is pure, uniformly thick copper enameled wire 5, resulting in a consistent number of turns and total area. This ensures a consistent magnetic flux through the coil, thereby maintaining relatively constant internal resistance, sensitivity, and damping. Previous low-frequency, high-sensitivity geophones, due to limitations such as elastic contact structures, could generally withstand only 4,000 drops. Above 4,000, technical parameters became unstable (failing to meet factory-specified tolerances, etc.). The present invention features a lead-spring output structure, combined with improved reliability of other components and links. This ensures that technical parameters remain stable (meeting factory-specified tolerances, etc.) even after 5,000 drops, significantly improving product reliability and stability. Previous low-frequency, high-sensitivity geophones, due to limitations such as elastic contact structures, had little room for cost reduction in processing and manufacturing. This utility model features a wire-spring output structure, which reduces the gold plating process and material consumption, significantly lowering manufacturing costs and saving over 10%. This reduces resource consumption while improving product competitiveness. Actual testing and application results of the first batch of 40,000 geophones produced using this solution have proven that compared to previous low-frequency, high-sensitivity geophones, this solution offers a longer life expectancy, better seismic signal reception, lower failure rate, and lower distortion, making it particularly suitable for high-precision, low-cost, and high-efficiency oil and gas seismic data acquisition.

[0034] Among them, the lead spring 15 is made of silver-clad copper wire with good conductivity, flexibility and elasticity as the basic material, and is placed between the upper magnetic shoe 13 and the lower magnetic shoe 10 as a further technical solution; the magnetic ring 12 is mounted on the magnetic steel 11, and the magnetic steel 11, the magnetic ring 12, the upper magnetic shoe 13 and the lower magnetic shoe 10 jointly generate a magnetic circuit.

[0035] In this embodiment, the magnetic circuit system is the basic condition for converting mechanical energy into electrical energy. The lower magnetic shoe 10, the magnetic steel 11, the magnetic ring 12, and the upper magnetic shoe 13 constitute the core magnetic circuit. The key characteristics of the magnetic circuit are high magnetic line density, good uniformity, good linearity, and good stability. It is based on the strong magnetic rare earth material neodymium iron boron, which makes the seismic detector more sensitive to tiny seismic signals, improves the precision and accuracy of detection, and effectively reduces distortion. The optimized magnetic circuit design can make the magnetic field distribution more uniform, ensuring that the winding coil can obtain stable magnetic field induction at all positions, thereby outputting a more reliable signal. The distortion of previous low-frequency, high-sensitivity seismic detectors is usually difficult for the manufacturer's internal control index to be less than 0.05%, and the guaranteed instantaneous dynamic range of the seismic signal is only 60dB. This utility model has for the first time made an innovative design of the spring sheet and magnetic circuit, effectively improving the linearity of the spring sheet and the magnetic circuit, thereby significantly reducing the distortion of the seismic detector. The test internal control index is generally less than 0.03%, which is equivalent to expanding the instantaneous dynamic range by nearly 100%, which is more conducive to high-precision oil and gas seismic exploration.

[0036] As a further technical solution, the magnet 11 is made based on the strong magnetic material of neodymium iron boron.

[0037] In this embodiment, the magnet 11 is made of strong magnetic material NdFeB, which can provide a strong and stable magnetic field and enhance the inductive sensitivity of the seismic detector. This allows the detector to capture tiny seismic signals more accurately, reduce signal distortion, and improve detection accuracy. The strong magnetic field helps to increase the intensity of the induced current in the coil, thereby making the signal output by the detector clearer and more reliable, providing a better data basis for subsequent seismic data analysis. NdFeB material has good magnetic stability and is not easily affected by external environmental factors. This ensures that the magnet 11 can maintain a stable magnetic field strength under different temperature, humidity and other conditions, ensuring that the performance of the seismic detector is stable and reliable. NdFeB material has high hardness and strength and can withstand a certain degree of mechanical shock and wear. This makes the magnet 11 not easily damaged during long-term use, extending the service life of the seismic detector.

[0038] As a further technical solution, the upper magnetic shoe 13 and the lower magnetic shoe 10 are asymmetrically designed.

[0039] In this embodiment, the magnetic circuit system consists of a magnet 11, a magnetic ring 12, and two magnetic shoes. The asymmetric design of the magnetic shoes optimizes the magnetic circuit system, creating a more uniform magnetic field, thereby reducing nonlinear distortion in the geophone. The addition of magnet 11, positioned between the upper magnetic shoe 13 and the lower magnetic shoe 10, works in conjunction with the magnetic ring 12 to create a magnetic circuit, significantly enhancing the strength and stability of the magnetic field.

[0040] As a further technical solution, the height of the magnetic steel is changed from the original 20.5mm to 9~10mm; the width of the wire groove for winding the enameled wire is changed from 9.5mm to 6.0~6.2mm.

[0041] In this embodiment, by adjusting the size of the magnetic circuit components, continuously improving the design and optimizing the process, the processed magnetic circuit components can fully meet the technical design requirements, especially the reliability, comprehensive cost, distortion, etc. to achieve the design goals.

[0042] A low-distortion seismic geophone with a lead spring 15 structure and a corresponding design and manufacturing process include the following main implementation steps:

[0043] Step 1: Based on the existing 5Hz natural frequency high-sensitivity seismic detector, with the quantitative goals of reducing distortion, improving reliability and reducing cost, by changing the elastic contact output to the lead spring 15 output, designing the upper and lower spring leaves 7 separately, making the spring ribs irregular in shape, the gaps uneven, and the upper and lower magnetic shoes 10 asymmetrical, and other technical innovations, formulate an overall technical plan for the design, material selection, processing, assembly, testing, and optimization of the lead spring 15 structure low-distortion high-sensitivity seismic detector.

[0044] Step 2: According to the overall design plan, select high-quality, high-performance basic materials that can fully meet the technical requirements from around the world.

[0045] Step 3: According to the overall design plan, the spring sheet assembly, magnetic circuit assembly, and lead spring 15 are processed and manufactured respectively. During the processing and manufacturing process, the design is continuously improved and the process is optimized so that the processed spring sheet assembly, lead spring 15, magnetic circuit assembly, etc. fully meet the technical design requirements, especially the reliability, comprehensive cost, distortion, etc. to achieve the design goals.

[0046] Step 4: According to the overall design plan, process and manufacture the coil assembly, sealing assembly, insulating terminal, retaining spring 4, top cover 2, bottom cover 9, shell and other accessories, and through continuous improvement of design, processing methods and manufacturing technology, make the processed and manufactured accessories fully meet the technical design requirements.

[0047] Step 5: According to the overall design plan, test and match the components that make up the core, select the best matching relationship, and then assemble the core.

[0048] Step 6: According to the overall design plan, conduct a comprehensive technical performance test on the assembled core, assemble a lead spring structure low-distortion seismic detector string with a total of no less than 500 pieces, connect the seismic instrument to conduct seismic data acquisition tests in the field, analyze the quality of the test data and statistically analyze the actual application effect, thereby proving that the comprehensive technical performance of the utility model meets the design goals, especially that it can fully meet the needs of high-precision, high-density, high-efficiency, and low-cost oil and gas seismic exploration.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A low-distortion seismic geophone with a lead spring structure, comprising: An insulator (1), a top cover (2), a wire rack (3), a retaining spring (4), an enameled wire (5), a housing (6), a sealing ring (8), a bottom cover (9), a lower magnetic shoe (10), and an upper magnetic shoe (13), characterized in that it further comprises: There are two lead springs (15), with both ends respectively arranged on the top cover (2) and the enameled wire (5); An upper spring sheet (14) and a lower spring sheet (7) are arranged in the housing (6), and a plurality of unevenly shaped gaps are provided on the upper spring sheet (14) and the lower spring sheet (7).

2. The low-distortion seismic geophone with a lead spring structure according to claim 1, characterized in that: The lead spring (15) is made of multiple strands of fine metal wires that are soft and conductive, and have appropriate length and pitch.

3. The low-distortion seismic geophone with a lead spring structure according to claim 1, characterized in that: Also includes: A magnetic steel (11) is arranged in the housing (6), and the magnetic steel (11) is located between the upper magnetic shoe (13) and the lower magnetic shoe (10); The magnetic ring (12) is sleeved on the magnetic steel (11), and the magnetic steel (11), the magnetic ring (12), the upper magnetic shoe (13) and the lower magnetic shoe (10) jointly generate a magnetic circuit.

4. The low-distortion seismic geophone with a lead spring structure according to claim 3, characterized in that: The magnetic steel (11) is made based on the strong magnetic material of neodymium iron boron.

5. The low-distortion seismic geophone with a lead spring structure according to claim 1, characterized in that: The upper magnetic shoe (13) and the lower magnetic shoe (10) are of asymmetrical design.

6. The low-distortion seismic geophone with a lead spring structure according to claim 3, characterized in that: The height of the magnetic steel (11) is modified from the original 20.5 mm to 9-10 mm.

7. The low-distortion seismic geophone with a lead spring structure according to claim 1, characterized in that: The width of the wire groove in which the enameled wire (5) is wound is changed from 9.5 mm to 6.0-6.2 mm.

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