A piezoelectric detector resistant to high hydrostatic pressure

Abstract

The present invention provides a high hydrostatic pressure resistant piezoelectric detector, comprising an end cap, a piezoelectric ceramic tube, a rubber coating, a decoupling ring and a lower decoupling ring, the inner ring surface of the piezoelectric ceramic tube is plated with a silver layer to form a positive electrode, and the outer ring surface of the piezoelectric ceramic tube is plated with a silver layer to form a negative electrode; one end of the decoupling ring is connected to the end face of the decoupling ring, and the outer surfaces of the decoupling ring, the lower decoupling ring, the piezoelectric ceramic tube and the end cap are provided with a rubber coating; the notch is connected to the center hole A of the decoupling ring, and the center hole A is connected to the center hole B of the end cap; the wire A is connected to the positive electrode and is led out through the notch, the center hole A and the center hole B, and the wire B is connected to the negative electrode and is led out through the through hole and the center hole B. The beneficial effects of the present invention are: 1. Simple structure and low cost; 2. High hydrostatic pressure resistance and wide application range; 3. Small size, simple process and high production efficiency; 4. Small coupling vibration and stable performance.

Description

Technical Field

[0001] The invention relates to the field of piezoelectric geophones, and mainly relates to a piezoelectric geophone that can withstand high hydrostatic pressure. Background Art

[0002] Piezoelectric geophones are core components of marine seismic exploration, oil exploration, engineering surveying and other equipment. They are used to receive exploration or measurement signals and require not only high acoustic sensitivity but also good mechanical strength and long-term reliability. In recent years, with the improvement of marine and oil exploration technologies, piezoelectric geophones need to be deployed in deeper seawater, which places higher requirements on the seawater pressure resistance of piezoelectric geophones. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the present invention provides a piezoelectric geophone capable of withstanding high hydrostatic pressure, which is mainly used for geological exploration and engineering measurement.

[0004] The purpose of the present invention is achieved through the following technical solutions. A high hydrostatic pressure resistant piezoelectric detector mainly comprises an end cap, a piezoelectric ceramic tube, a rubber coating layer, a decoupling ring and a lower decoupling ring, wherein the inner ring surface of the piezoelectric ceramic tube is plated with a silver layer to form a positive electrode, and the outer ring surface of the piezoelectric ceramic tube is plated with a silver layer to form a negative electrode; one end of the decoupling ring is connected to the end face of the decoupling ring, and a piezoelectric ceramic tube is sleeved on the outer circles of the decoupling ring and the lower decoupling ring, the other end of the decoupling ring is connected to the end cap, and the outer surfaces of the decoupling ring, the lower decoupling ring, the piezoelectric ceramic tube and the end cap are provided with a rubber coating layer; a fan-shaped notch is provided on the end face where the decoupling ring and the lower decoupling ring are connected, the notch is connected to the center hole A of the decoupling ring, the center hole A is connected to the center hole B of the end cap, and the end cap is provided with a through hole connected to the center hole B at a position close to the decoupling ring, and the through hole is arranged obliquely; a wire A is connected to the positive electrode and is led out through the notch, the center hole A and the center hole B, and a wire B is connected to the negative electrode and is led out through the through hole and the center hole B.

[0005] The end cover comprises a connecting section, a middle section and a tail section. The connecting section is provided with a sealing groove C fixedly connected to the rubber coating layer, the middle section is provided with a sealing groove B, and the tail section is provided with a sealing groove A.

[0006] The decoupling ring comprises a shaft A, a flange and a shaft B. The shaft A is inserted into the end cover, a fan-shaped notch is arranged on the shaft B, and the flange is a truncated cone structure with an inclined outer edge.

[0007] The decoupling ring is a stepped shaft structure, wherein the small diameter end has the same diameter as the shaft B and is connected at the end face, a piezoelectric ceramic tube is arranged in the groove formed by the end face of the large diameter end, the flange end face, the small diameter end and the outer circle of the shaft B, and the small diameter end, the shaft B and the inner wall of the piezoelectric ceramic tube are tightly matched.

[0008] The decoupling ring and the lower decoupling ring are made of high-density composite foam material.

[0009] The rubber coating layer is formed by injecting polyurethane rubber into a casting mold through a hot casting molding process.

[0010] The wire A and the wire B are standard wires with PVC sheaths.

[0011] The beneficial effects of the present invention are:

[0012] 1. Simple structure and low cost;

[0013] 2. Resistant to high hydrostatic pressure and has a wide range of uses;

[0014] 3. Small size, simple process and high production efficiency;

[0015] 4. The coupling vibration is small and the performance is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 This is the isometric view of the decoupling ring.

[0018] Explanation of the accompanying drawings: end cover 1, sealing groove B1-1, sealing groove A1-2, sealing groove C1-3, piezoelectric ceramic tube 2, rubber coating 3, decoupling ring 4, shaft A4-1, flange 4-2, flange end face 4-3, shaft B4-4, decoupling ring 5, wire A6, wire B7, center hole B8, through hole 9, notch 10, center hole A11. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and embodiments:

[0020] like Figure 1As shown, a piezoelectric detector resistant to high hydrostatic pressure is characterized in that it mainly includes an end cover 1, a piezoelectric ceramic tube 2, a rubber coating layer 3, a decoupling ring 4 and a decoupling ring 5. The piezoelectric ceramic tube 2 is made of lead zirconate titanate material, the inner ring surface of the piezoelectric ceramic tube 2 is plated with a silver layer to form a positive electrode, and the outer ring surface of the piezoelectric ceramic tube 2 is plated with a silver layer to form a negative electrode. One end of the upper decoupling ring 4 is connected to the end face of the decoupling ring 5, and a piezoelectric ceramic tube 2 is sleeved on the outer circle of the upper decoupling ring 4 and the decoupling ring 5, and the other end of the decoupling ring 4 is connected to the end cover 1, and a rubber coating layer 3 is arranged on the outside of the upper decoupling ring 4, the decoupling ring 5, the piezoelectric ceramic tube 2 and the end cover 1; a fan-shaped notch 10 is arranged on the end face where the decoupling ring 4 and the decoupling ring 5 are connected, the notch 10 is connected to the center hole A11 of the decoupling ring 4, the center hole A11 is connected to the center hole B8 of the end cover 1, and the end cover 1 is provided with a through hole 9 connected to the center hole B8 at a position close to the decoupling ring 4, and the through hole 9 is arranged obliquely; the wire A6 is connected to the positive electrode and is led out through the notch 10, the center hole A11 and the center hole B8, and the wire B7 is connected to the negative electrode and is led out through the through hole 9 and the center hole B8.

[0021] The end cap 1 is made of engineering plastics with high strength, easy processing and good adhesion to polyurethane rubber, and includes a connecting section, a middle section and a tail section. The connecting section is provided with a sealing groove C1-3 and fixedly connected to the rubber coating layer 3, the middle section is provided with a sealing groove B1-1, and the tail section is provided with a sealing groove A1-2. When the high hydrostatic pressure resistant piezoelectric detector is installed and matched with structures such as an electronic tube, it can play a sealing role.

[0022] The decoupling ring 4 includes a shaft A4-1, a flange 4-2 and a shaft B4-4. The shaft A4-1 is inserted into the end cover 1. The shaft B4-4 is provided with a fan-shaped notch 10. The flange 4-2 is a truncated cone structure with an inclined outer edge to increase the connection strength. The notch 10 is used to avoid the welding point formed by the positive electrode wire A6 being welded to the inner wall positive electrode of the piezoelectric ceramic tube 2.

[0023] The decoupling ring 5 is a stepped shaft structure, in which the small diameter end has the same diameter as the shaft B4-4 and is connected end-face to end, and a piezoelectric ceramic tube 2 is arranged in the groove formed by the end face of the large diameter end, the flange end face 4-3, the small diameter end and the outer circle of the shaft B4-4, and the small diameter end, the shaft B4-4 and the inner wall of the piezoelectric ceramic tube 2 are tightly matched.

[0024] The decoupling ring 4 and the lower decoupling ring 5 are made of high-density composite foam material, and the two are closely matched with the inner wall of the piezoelectric ceramic tube, which is conducive to the high hydrostatic pressure resistant piezoelectric detector to withstand external pressure.

[0025] The rubber coating layer 3 is formed by injecting polyurethane rubber into a casting mold through a hot casting process.

[0026] The wire A6 and the wire B7 are standard wires with PVC sheaths.

[0027] Installation process:

[0028] First, two PVC-sheathed wires A6 and B7 are welded to the inner and outer walls of the piezoelectric ceramic tube 2, respectively serving as the positive and negative electrodes of the detector. The positive wire welding point is located in the middle of the inner wall of the piezoelectric ceramic tube 2, and the negative wire welding point is located at the upper part of the outer wall of the piezoelectric ceramic tube 2, to facilitate the lead-out of wire B7.

[0029] Then, the decoupling ring 4 is inserted into the piezoelectric ceramic tube 2 , the notch of the decoupling ring 4 is aligned with the positive electrode welding point on the inner wall of the piezoelectric ceramic tube 2 , and the positive electrode wire A6 passes through the center hole A11 of the decoupling ring 4 .

[0030] Next, the decoupling ring 5 is inserted into the piezoelectric ceramic tube 2, the end cover 1 is matched with the decoupling ring 4, and the positive and negative electrodes of the wire are passed through the center hole B8 of the end cover 1 respectively.

[0031] The above components are loaded into a cylindrical casting mold together, and the center line of the piezoelectric ceramic tube 2 is adjusted to coincide with the center line of the casting mold. Then the prepared polyurethane liquid rubber is slowly injected into the casting mold, and then the whole is put into an oven for heating and curing, and finally the casting mold is removed.

[0032] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and inventive concept of the present invention should fall within the protection scope of the claims attached to the present invention.

Claims

1. A piezoelectric detector capable of withstanding high hydrostatic pressure, characterized in that: The invention comprises an end cover (1), a piezoelectric ceramic tube (2), a rubber coating layer (3), a decoupling ring (4) and a lower decoupling ring (5); the inner ring surface of the piezoelectric ceramic tube (2) is plated with a silver layer to form a positive electrode, and the outer ring surface of the piezoelectric ceramic tube (2) is plated with a silver layer to form a negative electrode; one end of the upper decoupling ring (4) is connected to the end face of the lower decoupling ring (5), and the piezoelectric ceramic tube (2) is sleeved on the outer rings of the upper decoupling ring (4) and the lower decoupling ring (5); the other end of the upper decoupling ring (4) is connected to the end cover (1), and the outer surfaces of the decoupling ring (4), the decoupling ring (5), the piezoelectric ceramic tube (2) and the end cover (1) are provided with a rubber coating layer. (3); a fan-shaped notch (10) is provided on the end surface where the decoupling ring (4) is connected to the decoupling ring (5); the notch (10) is connected to the center hole A (11) of the decoupling ring (4); the center hole A (11) is connected to the center hole B (8) of the end cover (1); the end cover (1) is provided with a through hole (9) connected to the center hole B (8) at a position close to the decoupling ring (4); the through hole (9) is arranged obliquely; the wire A (6) is connected to the positive electrode and is led out through the notch (10), the center hole A (11) and the center hole B (8); the wire B (7) is connected to the negative electrode and is led out through the through hole (9) and the center hole B (8); The end cover (1) comprises a connecting section, a middle section and a tail section, the connecting section is provided with a sealing groove C (1-3) fixedly connected to the rubber coating layer (3), the middle section is provided with a sealing groove B (1-1), and the tail section is provided with a sealing groove A (1-2); The upper decoupling ring (4) comprises a shaft A (4-1), a flange (4-2) and a shaft B (4-4); the shaft A (4-1) is inserted into the end cover (1); a fan-shaped notch (10) is provided on the shaft B (4-4); and the flange (4-2) is a truncated cone structure with an inclined outer edge.

2. The high hydrostatic pressure resistant piezoelectric detector according to claim 1, characterized in that: The decoupling ring (5) is a stepped shaft structure, wherein the small diameter end has the same diameter as the shaft B (4-4) and is connected at the end face, a piezoelectric ceramic round tube (2) is arranged in a groove formed by the end face of the large diameter end, the flange end face (4-3), the small diameter end and the outer circle of the shaft B (4-4), and the small diameter end, the shaft B (4-4) and the inner wall of the piezoelectric ceramic round tube (2) are tightly matched.

3. The high hydrostatic pressure resistant piezoelectric detector according to claim 1, characterized in that: The decoupling ring (4) and the lower decoupling ring (5) are made of high-density composite foam material.

4. The high hydrostatic pressure resistant piezoelectric detector according to claim 1, characterized in that: The rubber coating layer (3) is formed by injecting polyurethane rubber into a casting mold through a hot casting molding process.

5. The high hydrostatic pressure resistant piezoelectric detector according to claim 1, characterized in that: The wire A (6) and the wire B (7) are standard wires with PVC sheaths.

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