A water reservoir for an inflatable dry-hole sonic testing probe

Abstract

The present application relates to the technical field of geophysical professional borehole acoustic testing equipment, and particularly relates to a water reservoir for an inflatable dry borehole acoustic testing probe. The water reservoir comprises a water reservoir shell, which is used for fixed installation at the rear end of the acoustic testing probe. An inflatable air bag is arranged in the water reservoir shell. The water reservoir shell and the inflatable air bag form a water storage space. The water reservoir shell is provided with an inflation port in sealed communication with the inflatable air bag, and a water passage port in sealed communication with the water storage space. The water passage port is used for sealed communication with a water storage bag of the acoustic testing probe. The water storage space of the water reservoir and the water storage bag are in communication with each other. Water stored in the water reservoir can be squeezed into the water storage bag by inflating the inflatable air bag, so as to realize coupling between a vibration pickup and a borehole wall. After testing, the air in the inflatable air bag is released, and the water flows back to the water storage space. The water reservoir can be suitable for drilling testing work in different directions and at different depths.

Description

Technical Field

[0001] This invention relates to the technical field of geophysical exploration borehole acoustic wave testing equipment, specifically to a water reservoir for an inflatable dry borehole acoustic wave testing probe. Background Technology

[0002] Currently, borehole exploration is frequently used in engineering geological surveys, resulting in a significant workload for in-hole acoustic testing. Acoustic testing presents several challenges: In boreholes, the vibrator is fully coupled with water to the borehole wall. However, in inclined or horizontal boreholes, water is difficult to retain. In some downward-inclined and vertical boreholes, the rock mass is fractured, and water is often absent, making it impossible to complete in-hole acoustic testing.

[0003] Currently available dry-hole acoustic wave test probes typically have three signal lines: one connecting to the ultrasonic transmitting probe, and the other two connecting to two ultrasonic receiving probes, all designed for "upward-sloping holes." The characteristics of this type of probe are: during testing, a capsule is installed below the probe, and air is pumped into the capsule to seal the area below the probe. Water is then pumped into the hole above the capsule through a water inlet pipe. Once the top probe is submerged, all three probes are fully coupled to the hole wall, allowing for testing. After testing, the air inside the capsule is released, the capsule detaches from the hole wall, and the water flows out naturally by gravity. The probe can then be moved to the next test point. Because frequent water injection and drainage are required inside the hole, workers below are often soaked, especially in winter. This testing method is also prone to problems: sometimes excessive water injection causes the air bladder to rupture, and sometimes insufficient water injection leads to poor coupling. The overall operation is cumbersome and complex, resulting in limited adoption.

[0004] In the prior art, for example, Chinese invention patent application CN114994747A discloses a "gravity-type dry-hole acoustic probe", which includes a pickup, a bag, an inlet and outlet pipe, a plug, a multi-hole connector, and a pickup signal line; the acoustic probe is provided with a first pickup, a second pickup, and a third pickup in sequence, the first pickup transmits a signal, and the other two receive the signal, and the pickups are connected by screws through the multi-hole connector; the free ends of the first pickup and the third pickup are respectively connected by screws to the first plug and the third plug. The two end caps, the vibratory pickup, the multi-hole connector, and the outer side of the end caps are fitted with a bag. The two ends of the bag are respectively sealed and connected to the outer peripheral walls of the two end caps. The inlet and outlet pipes and the signal line of the vibratory pickup pass through the first end cap and enter the inner cavity of the bag. Water is injected and drained into the bag through the inlet and outlet pipes. The water injection makes the bag contact the hole wall. The vibratory pickup realizes the upward-sloping dry hole acoustic wave test through water coupling. After the test, the water in the bag is discharged by gravity through the inlet and outlet pipes to avoid the test personnel getting wet. The contact between the bag and the hole wall can ensure the coupling effect and ensure the accuracy of the exploration.

[0005] However, the aforementioned gravity-type dry-hole acoustic probe is only suitable for upward-sloping holes. When using this type of probe to test downward-sloping or vertical holes, the water in its bladder is difficult to drain or extract, causing the acoustic probe to become immobile and difficult to pull out of the hole. Therefore, the aforementioned gravity-type dry-hole acoustic probe is not suitable for downward-sloping or vertical holes and has low practicality. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a water reservoir for an inflatable dry hole acoustic wave test probe. The water storage space and the water storage bag of the water reservoir are connected to each other. The water stored in the water reservoir can be squeezed into the water storage bag by inflating the air bag to achieve coupling between the vibration pickup and the hole wall. After the test, the air in the air bag is released and the water flows back to the water storage space. It can be applied to drilling test work of different depths in various directions.

[0007] To address the aforementioned technical problems, the present invention provides a water reservoir for an inflatable dry-hole acoustic wave test probe, comprising a water reservoir shell for fixed installation at the rear end of the acoustic wave test probe, an inflatable air bladder inside the water reservoir shell, forming a water storage space between the inflatable air bladder and the water reservoir shell, and an inflation port sealed and connected to the inflatable air bladder and a water inlet sealed and connected to the water storage space on the water reservoir shell, the water inlet being sealed and connected to the water storage bladder of the acoustic wave test probe.

[0008] Furthermore, a hollow shaft is provided inside the water reservoir shell for the signal line of the acoustic wave test probe to pass through. The two ends of the inflatable airbag are respectively sealed and fixed to the two ends of the water reservoir shell, and a sealed inflation space is formed between the inflatable airbag and the hollow shaft.

[0009] Furthermore, the water storage tank housing includes a cylindrical housing, with a first water storage plug and a second water storage plug respectively provided at the front and rear ends of the cylindrical housing. Both the first water storage plug and the second water storage plug have through holes at their centers. The hollow shaft passes through the two through holes from back to front and is sealed and fixed to the two through holes.

[0010] Furthermore, the opposite ends of the first plug and the second plug of the water reservoir are provided with inner extension rings concentric with the through hole, and the two ends of the inflatable airbag are respectively inserted and sealed on the corresponding inner extension rings.

[0011] Furthermore, the water inlet is located on the first plug of the water reservoir, the air inlet is located on the second plug of the water reservoir, and the air inlet is located on the portion of the second plug of the water reservoir located within its inner extension ring.

[0012] Furthermore, the second plug of the water storage device has an inlet corresponding to the position of the water storage space, and the inlet and the outlet are arranged concentrically and connected to the water storage space.

[0013] Furthermore, a connecting pipe is provided at the front end of the water storage tank shell, and a connector is provided at the front end of the connecting pipe. The connector has a connecting hole at the position corresponding to the water inlet, and the connecting hole is connected to the water inlet through an inlet / outlet pipe.

[0014] Furthermore, a guide is provided at the rear end of the water storage tank shell. The guide is a conical structure that is larger at the front and smaller at the back. The rear end of the guide is fixedly connected to a hollow shaft. A first guide opening is provided on the middle circumference of the guide corresponding to the air inlet. An air inlet and outlet pipe passes through the first guide opening. The front end of the air inlet and outlet pipe is connected to the air inlet.

[0015] Furthermore, the rear end of the hollow shaft extends out of the water reservoir housing and has a groove. A columnar nut is fixedly installed at the rear end of the hollow shaft, and a push rod is threaded onto the columnar nut.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] (1) A water reservoir is installed at the rear of the acoustic wave test probe to form an inflatable dry-hole acoustic wave test probe. A water storage space is formed between the inflatable bladder of the water reservoir and the outer shell of the water reservoir. In actual use, the water reservoir follows the acoustic wave test probe deep into the hole. When the acoustic wave test probe reaches the designated position, it is inflated through the inflation port. The inflatable bladder expands, squeezing the water in the water storage space and allowing it to enter the water storage bladder through the water inlet. This ensures that the water storage bladder makes full contact with the hole wall, enabling the vibration pickup to couple with the hole wall through water, thus allowing acoustic wave testing. After data acquisition is complete, the inflation port is deflated, the inflatable bladder retracts, causing the water in the water storage bladder to flow back into the water storage space. The water storage bladder then retracts and separates from the hole wall, allowing the acoustic wave probe to move to the next test point. This invention allows for acoustic wave testing at any drilling angle and does not require an additional water pump or water source; simply inflating and deflating the bladder is sufficient, making it convenient and quick.

[0018] The water reservoir with a rigid shell is located at the rear of the acoustic wave test probe, which can be easily inserted into the upper angled hole. The two can be detached for easy carrying and transportation.

[0019] (2) An inlet is provided on the second plug of the water storage device so that the water in the storage space can be released when not in use, making it convenient for transportation and carrying.

[0020] (3) The conical guide facilitates the removal of the water reservoir from the test borehole for use with the air-filled dry hole acoustic test probe. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure and appearance of the water storage device in Embodiment 1 of the present invention.

[0022] Figure 2 This is a cross-sectional view of the water storage device in Embodiment 1 of the present invention.

[0023] Figure 3 This is a first-direction axonometric view of the first plug of the water storage device in Embodiment 1 of the present invention.

[0024] Figure 4 This is a second-direction isometric view of the first plug of the water storage device in Embodiment 1 of the present invention.

[0025] Figure 5 This is an isometric view of the second plug of the water storage device in the first direction in Embodiment 1 of the present invention.

[0026] Figure 6 This is a second-direction isometric view of the second plug of the water storage device in Embodiment 1 of the present invention.

[0027] Figure 7 This is a schematic diagram of the structure and appearance of the guide in Embodiment 1 of the present invention.

[0028] Figure 8 This is a schematic diagram of the overall structure and appearance of the acoustic wave test probe in Embodiment 1 of the present invention.

[0029] Figure 9 This is a cross-sectional view of the acoustic wave testing probe in Embodiment 1 of the present invention.

[0030] Figure 10 This is a schematic diagram of the structure and appearance of the vibration pickup assembly and signal amplifier in Embodiment 1 of the present invention.

[0031] Figure 11 This is a schematic diagram of the structure and appearance of the signal amplifier in Embodiment 1 of the present invention.

[0032] Figure 12 This is a composition diagram of the amplifier components in Embodiment 1 of the present invention.

[0033] Figure 13 This is a composition diagram of the filter in Embodiment 1 of the present invention.

[0034] Figure 14 This is a cross-sectional view of the first plug in Embodiment 1 of the present invention.

[0035] Figure 15 This is a schematic diagram of the structure and appearance of the second plug in Embodiment 1 of the present invention.

[0036] Figure 16 This is a schematic diagram of the connector structure in Embodiment 1 of the present invention.

[0037] Figure 17This is a schematic diagram of the structure of the inflatable dry-hole acoustic wave test probe in Embodiment 1 of the present invention.

[0038] Figure 18 This is a cross-sectional view of the inflatable dry-hole acoustic wave test probe in Embodiment 1 of the present invention.

[0039] Figure 19 This is a schematic diagram of the structure and appearance of the first vibration pickup in Embodiment 1 of the present invention.

[0040] Figure 20 This is a schematic diagram of the structure and appearance of the second porous connector in Embodiment 1 of the present invention.

[0041] In the diagram: 1. Acoustic wave test probe; 11. Vibration pickup assembly; 111. First vibration pickup; 112. Second vibration pickup; 113. Third vibration pickup; 114. First porous connector; 115. Second porous connector; 116. High-strength fiber; 121. First plug; 1211. Vent hole; 122. Second plug; 123. Protective ring; 124. Eye bolt; 125. Explosion-proof capsule; 126. Water passage hole; 13. Water storage bag; 15. Signal line; 151. Vibration pickup signal line; 152. Amplifier signal line; 153. Extension section;

[0042] 2. Water reservoir; 21. Water reservoir outer shell; 211. Cylindrical outer shell; 212. First plug of water reservoir; 213. Second plug of water reservoir; 214. Through hole; 215. Inner ring; 22. Water inlet; 23. Air inlet; 24. Water inlet; 25. Hollow shaft; 251. Cable trough; 252. Air filling space; 26. First capillary tube; 27. Second capillary tube; 28. Third capillary tube; 29. ​​Inflatable airbag; 210. Water storage space;

[0043] 3. Connecting pipe; 4. Connector; 41. Connecting hole; 5. Inlet / outlet pipe; 6. Water inlet pipe; 7. Inlet / outlet pipe;

[0044] 8. Guide; 81. First guide hole; 82. Second guide hole; 9. Columnar nut; 10. Signal amplifier; 101. Amplifier housing; 1011. Mounting hole; 1012. Screw hole; 1013. Tapered tail;

[0045] 102. Amplifier components; 1021. Preamplifier; 1022. Filter; 1023. Differential amplifier; 1024. Matching circuit; 1025. High-pass filter; 1026. Band-pass filter; 1027. Low-pass filter. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings: Specific Implementation Example 1:

[0048] refer to Figures 1 to 20 The present invention provides a water reservoir for an inflatable dry-hole acoustic wave test probe (hereinafter referred to as the water reservoir), which is applied to applications such as... Figure 8 , 9 The acoustic wave test probe 1 shown is assembled as follows: Figure 17 , 18 The inflatable dry-hole acoustic wave test probe shown is shown.

[0049] Specifically, in this embodiment, such as Figure 8 , 9 As shown in Figure 10, the acoustic wave test probe 1 includes a pickup assembly 11, a first plug 121 and a second plug 122 respectively disposed at both ends of the pickup assembly 11, a high-strength fiber 116 connecting adjacent pickups, and a water storage bag 13 sleeved on the outside of the pickup assembly 11. The two ends of the water storage bag 13 are sealed and fixed to the first plug 121 and the second plug 122 respectively. Explosion-proof capsules 125 are fitted on the outer sides of both ends of the water storage bag 13. The first plug 121 has an air vent 1211 and a lifting eye screw 124. This creates a sealed space inside the water storage bag 13. In actual use, water is first filled into the water storage bag 13 to expel the internal air. After tightening the lifting eye screw 124, the test probe can be inserted into the test borehole. Continued water injection into the water storage bag causes it to expand and fully contact the borehole wall. The pickup assembly 11 couples with the borehole wall through the water, thus enabling acoustic wave testing at that point.

[0050] Furthermore, in this embodiment, the first plug 121, the second plug 122, the vibration pickup assembly 11, and the water storage bag 13 are arranged concentrically, which allows the vibration pickup assembly 11 to be located in the middle of the borehole during testing, thereby enhancing the initial arrival signal strength of the longitudinal wave and improving signal quality.

[0051] Specifically, in this embodiment, such as Figure 9 , 10 As shown, the vibration pickup assembly 11 includes three vibration pickups, namely a first vibration pickup 111, a second vibration pickup 112 and a third vibration pickup 113 arranged sequentially in the front-back direction. The third vibration pickup 113 is used to transmit signals, and the first vibration pickup 111 and the second vibration pickup 112 are used to receive signals.

[0052] Adjacent vibration pickups are connected by a porous connector, which includes a first porous connector 114 detachably connected between the first vibration pickup 111 and the second vibration pickup 112, and a second porous connector 115 connecting the second vibration pickup 112 and the third vibration pickup 113. Specifically, as shown... Figure 20 As shown, the first porous connector 114 is similar to the second porous connector 115, both being cylindrical thin-walled hollow tube structures with multiple gaps on their side walls. These gaps can prevent the second and third vibration pickups 112 and 113 from receiving interference signals that propagate directly along the porous connector, thereby improving the signal-to-noise ratio.

[0053] In this embodiment, as Figure 10 , 19 As shown, each end of the vibratory pickup has an extension section 153. The front and rear ends of the porous connector are respectively inserted into the extension section 153 of the corresponding vibratory pickup and fixedly connected by screws. In this embodiment, both the first porous connector 114 and the second porous connector 115 are nylon connecting parts. The wave velocity of nylon material is relatively low compared to rigid materials. To prevent the porous connector between adjacent vibratory pickups from breaking when the water storage bag 13 expands, high-strength fibers 116 are also connected between adjacent vibratory pickups. Specifically, three high-strength fibers 116 are arranged in a ring array along the axial direction between adjacent vibratory pickups to increase the overall service life of the acoustic probe. At the same time, when the water storage bag 13 is filled with water and expands, the nylon porous connector is easily stretched, which leads to a longer distance between adjacent vibratory pickups and a longer sound wave propagation time. Therefore, the use of high-strength fibers 116 can also prevent changes in the distance between adjacent vibratory pickups from causing inaccurate wave velocity calculations.

[0054] In this embodiment, as Figure 9 , 10 As shown in Figure 14, the rear of the first plug 121 is provided with a slot adapted to the extension 153 of the first vibration pickup 111. This slot is fitted onto the extension 153 at the front end of the first vibration pickup 111 and is fixedly connected by screws. A vent 1211 extending in the front-rear direction is provided in the middle of the first plug 121. The vent 1211 communicates with the water storage bag 13. A lifting eye screw 124 is threaded to the front end of the vent 1211, and the lifting eye screw 124 and the vent 1211 are sealed together by a sealing gasket. In actual use, the front end of the acoustic wave test probe 1 is first positioned upwards, the lifting eye screw 124 is unscrewed, and water is simultaneously injected into the water storage bag 13. When water overflows from the upper end of the first plug 121, it indicates that the air inside the water storage bag 13 has been emptied.

[0055] In this embodiment, as Figure 9 , 14As shown, the outer contour of the first plug 121 includes a large-diameter section, a medium-diameter section, and a small-diameter section from front to back. The front end of the water storage bag 13 is fitted onto the medium-diameter section and is fixedly sealed with an explosion-proof capsule 125 to prevent it from falling off. The explosion-proof capsule 125 can prevent the water storage bag 13 from suddenly expanding in a fixed position and bursting when it is filled with water. The outer diameter of the small-diameter section is flush with the outer diameter of the vibration pickup assembly 11. The extension section 153 of the front end of the first vibration pickup 111 is inserted into the inner ring of the small-diameter section and fixedly connected with screws.

[0056] By utilizing the diameter difference between the small-diameter and medium-diameter sections of the first plug 121, the water storage bag 13 and the vibration pickup assembly 11 can be arranged at intervals. This avoids direct contact between the screws used to fix the vibration pickups and the multi-hole connectors, and between the vibration pickup assembly and the first and second plugs, thus protecting the water storage bag 13. The outer periphery of the large-diameter section is flush with the outer periphery of the explosion-proof capsule 125, and a tapered structure is provided at the front of the large-diameter section to facilitate entry and exit of the test borehole.

[0057] In this embodiment, as Figure 1 , 2 As shown, the water reservoir 2 includes a water reservoir shell 21, which is used to be fixedly installed at the rear end of the acoustic wave test probe 1. An inflatable airbag 29 is provided inside the water reservoir shell 21, and a water storage space 210 is formed between the inflatable airbag 29 and the water reservoir shell 21. The water reservoir shell 21 is provided with an inflation port 23 that is sealed and connected to the inflatable airbag 29, and a water inlet 22 that is sealed and connected to the water storage space 210. The water inlet 22 is used to be sealed and connected to the water storage bag 13 of the acoustic wave test probe 1.

[0058] The rear of the acoustic wave test probe 1 is connected to the water reservoir 2. The inflatable bladder 29 of the water reservoir 2 and the outer shell 21 of the water reservoir form a water storage space 210. In actual use, the acoustic wave test probe 1 is inserted into the hole. When the acoustic wave test probe 1 reaches the designated position, it is inflated through the inflation port 23. The inflation bladder 29 expands, and the water in the water storage space 210 is squeezed and enters the water storage bag 13 through the water inlet 22, so that the water storage bag 13 is in full contact with the hole wall. This enables the vibration pickup to couple with the hole wall through water, and acoustic wave testing can be performed. After the data acquisition is completed, the inflation port 23 is deflated, the inflation bladder 29 retracts, and the water in the water storage bag 13 flows back to the water storage space 210. The water storage bag 13 retracts and separates from the hole wall, and the acoustic wave probe can be moved to the next test point. The acoustic test probe 1 can perform acoustic tests on boreholes at any angle without the need for an additional water pump or water source; it only requires inflation and deflation, making it convenient, quick, and easy to test, thus improving its practicality.

[0059] Meanwhile, in this embodiment, the water reservoir 2 with a rigid shell is located at the rear of the acoustic wave test probe 1, which makes it easy for the acoustic wave test probe 1 to be inserted into the upper oblique hole. The acoustic wave test probe 1 and the water reservoir 2 can be detachably connected, making it easy to carry and transport.

[0060] Preferably, in this embodiment, a hollow shaft is also provided inside the water reservoir shell. The hollow shaft is used for the signal line of the acoustic wave test probe to pass through. The two ends of the inflatable airbag are respectively sealed and fixed to the two ends of the water reservoir shell, and a sealed inflation space is formed between the inflatable airbag and the hollow shaft.

[0061] Specifically, in this embodiment, such as Figure 17 , 18 As shown, a signal amplifier 10 is provided between the acoustic wave test probe 1 and the water storage tank 2. The signal amplifier 10 includes a columnar amplifier housing 101 and an amplifier element 102 disposed inside the amplifier housing 101. The acoustic wave test probe 1 and the water storage tank 2 are respectively fixed at both ends of the amplifier housing 101. The signal amplifier 10 enables a detachable connection between the acoustic wave test probe 1 and the water storage tank 2.

[0062] In this embodiment, the signal line 15 of the acoustic wave test probe 1 includes a pickup signal line 151 and an amplifier signal line 152. The pickup signal line 151 connects the output end of the pickup assembly 11 and the input end of the amplifier element 102. The amplifier signal line 152 connects the output end of the amplifier element 102 and extends backward through the hollow shaft 25 to connect to an external receiving device.

[0063] Specifically, in this embodiment, such as Figure 11 As shown, the front end of the amplifier housing 101 is provided with a mounting hole 1011 that is adapted to the extension 153 of the third pickup 113. The outer diameter of the amplifier housing 101 is adapted to the outer diameter of the pickup assembly 11. The amplifier housing 101 has screw holes 1012 at the positions corresponding to the mounting hole 1011. The rear end of the third pickup 113 is inserted and fixedly connected to the front end of the amplifier housing 101 by screws screwed into the screw holes 1012. The pickup signal line 151 passes through the mounting hole 1011 into the amplifier housing 101 and is connected to the amplifier element 102 inside it. In this way, the pickup assembly 11 and the signal amplifier 10 are fixedly arranged sequentially in the front-to-back direction.

[0064] In this embodiment, as Figure 8 , 9As shown in Figure 11, the inner diameter of the second plug 122 is adapted to the outer diameter of the amplifier housing 101, and the outer diameter of the second plug 122 is adapted to the middle diameter section of the first plug 121. The circumference of the amplifier housing 101 is provided with screw holes 1012 corresponding to the position of the second plug 122. The second plug 122 is sleeved and detachably fixed to the front of the amplifier housing 101 by screws screwed into the corresponding screw holes 1012, and is sealed with the amplifier housing 101.

[0065] In this embodiment, a water passage hole 126 communicating with the water storage bag 13 is provided on the end face of the second plug 102 along its axial direction. Water is injected into the water storage bag 13 through the water passage hole 126 for coupling testing.

[0066] like Figure 8 , 15 As shown, in this embodiment, a protective ring 123 is fixedly provided on the rear outer periphery of the second plug 122. The outer diameter of the protective ring 123 is adapted to the large diameter section of the first plug 121, forming a variable diameter structure. A cylindrical connector 4 is fixedly provided on the rear of the amplifier housing 101. The inner diameter of the connector 4 is adapted to the outer diameter of the amplifier housing 101, and the outer diameter of the connector 4 is adapted to the outer diameter of the protective ring 123. A connecting hole 41 is provided at the position of the connector 4 corresponding to the water passage hole 126. The connecting hole 41 and the water passage hole 126 are arranged concentrically. An inlet and outlet pipe 5 is connected between the connecting hole 41 and the water passage hole 126. The rear end of the inlet and outlet pipe 5 is used to connect to the water inlet of the water storage device 2.

[0067] The protective ring 123 fitted behind the second plug 122 provides some protection for the signal amplifier 10, preventing damage to the signal amplifier 10 due to collision or friction during drilling operations. The water passage 126 and the connecting hole 41 connect to the inlet and outlet pipes 5, ensuring water circulation between the water storage bag 13 and the water reservoir 2, allowing for smooth water injection and drainage operations. This facilitates control of the water volume and pressure within the water storage bag 13, thereby achieving good coupling between the acoustic probe and the borehole wall, and improving the probe's operability and functionality.

[0068] In this embodiment, the rear end of the water storage bag 13 is fitted onto the second plug 122 and sealed and fixed by the explosion-proof capsule 125. At the same time, the outer periphery of the explosion-proof capsule 125 is aligned with the outer periphery of the protective ring 123 to ensure that the water storage bag 13 is a columnar structure with equal diameter.

[0069] In this embodiment, the inner surface of the water storage bag 13 is rough, which can increase the friction between the water storage bag 13 and the plug assembly, ensuring that the water storage bag 13 is not easy to fall off.

[0070] The smooth and flat outer surface of the water reservoir 13 facilitates coupling between the columnar water reservoir 13 and the borehole wall, improving signal quality. At the same time, it reduces the frictional resistance between the water reservoir 13 and the borehole wall when moving inside the borehole, making it easier to insert and remove the test probe and reducing the risk of the water reservoir 13 being scratched.

[0071] In this embodiment, as Figure 12 , 13 As shown, the amplifier element 102 includes a preamplifier 1021, a filter 1022, and a differential amplifier 1023 connected in series. The preamplifier 1021, filter 1022, and differential amplifier 1023 sequentially amplify, filter, and convert the signal from the pickup assembly 11 into a differential signal. This effectively enhances signal strength, removes noise, and converts the signal into a balanced differential signal with strong anti-interference capabilities. It improves the reliability and accuracy of the entire acoustic wave test probe in complex environments, ensures that the received signal is not distorted during long-distance transmission, and improves signal quality and recognizability. This allows for more accurate acquisition of acoustic wave information within the borehole, ensuring the accuracy and reliability of exploration data. It is beneficial for the precise analysis of geological structures and other information in engineering geological exploration work and is more suitable for large-scale field and deep well testing scenarios with high signal quality requirements.

[0072] Specifically, in this embodiment, the amplifier signal line 152 is a twisted-pair cable. Utilizing the characteristics of twisted-pair cables, common-mode noise can be effectively suppressed, reducing signal interference during transmission and further ensuring the stability and accuracy of signal transmission. This allows the amplified and processed signal to be transmitted more reliably to the receiving device. Even during long-distance transmission or in the presence of external electromagnetic interference, the risk of signal distortion can be reduced, enabling the transmission of weak received signals over longer distances and ensuring the quality of deep hole detection. This improves the reliability of the test results.

[0073] Preferably, in this embodiment, a matching circuit 1024 is further provided at the output terminal of the differential amplifier 1023. The matching circuit 1024 receives the balanced differential signal from the differential amplifier and adjusts the output impedance of the signal so that the output impedance matches the characteristic impedance of the twisted pair. This design can minimize signal reflection during transmission, avoid signal amplitude and phase changes caused by impedance mismatch, thereby ensuring that the signal is transmitted in the twisted pair with minimal loss and distortion, guaranteeing the quality of long-distance signal transmission, enabling the acoustic wave test probe to adapt to the testing requirements of deeper boreholes, and improving the applicability and versatility of the probe in different engineering environments.

[0074] Due to the anti-interference properties of differential signals and the good transmission conditions after matching, common-mode noise is suppressed and distortion is small when the signal is transmitted over twisted-pair cables. This allows for distortion-free transmission over long distances, ensuring that the signal can still be effectively received and processed after long-distance transmission.

[0075] In this embodiment, filter 1022 includes a high-pass filter 1025, a band-pass filter 1026, and a low-pass filter 1027. The high-pass filter 1025 filters out low-frequency interference, the band-pass filter 1026 accurately selects specific frequency bands related to the acoustic signal, and the low-pass filter 1027 removes high-frequency noise. This effectively purifies the signal acquired by the pickup assembly 11, improves the signal-to-noise ratio, and provides a higher-quality signal source for subsequent signal amplification and analysis. This helps to more accurately obtain acoustic information within the borehole and improves the accuracy of engineering geological exploration.

[0076] Specifically, in this embodiment, the input and output terminals of the high-pass filter 1025, band-pass filter 1026, and low-pass filter 1027 are connected in series. The input terminal of the high-pass filter 1025 is connected to the output terminal of the preamplifier 1021, and the output terminal of the low-pass filter 1027 is connected to the input terminal of the differential amplifier 1023. The amplified signal input from the preamplifier 1021 first enters the high-pass filter 1025 to filter out low-frequency interference, then passes through the band-pass filter 1026 to further filter out the target acoustic frequency band, and finally uses the low-pass filter 1027 to remove residual high-frequency noise, forming a complete and orderly signal filtering chain. This maximizes signal quality and achieves fine filtering processing, improving the performance and stability of the entire signal processing system. Of course, in other embodiments, depending on actual usage requirements, a filter 1022 can also be selected, consisting of the high-pass filter 1025, band-pass filter 1026, and low-pass filter 1027 connected in parallel.

[0077] In this embodiment, as Figure 9 As shown, the outer diameter of the large-diameter section of the first plug 121 is flush with the outer diameter of the explosion-proof capsule 125. A tapered front end is provided at the front of the large-diameter section, and a tapered tail 1013 is provided at the rear end of the amplifier housing 101 to facilitate entry and exit of the test borehole.

[0078] In this embodiment, as Figure 1 , 2 As shown, the water reservoir housing 21 includes a cylindrical housing 211. The front and rear ends of the cylindrical housing 211 are respectively provided with a first water reservoir plug 212 and a second water reservoir plug 213. The center of the first water reservoir plug 212 and the second water reservoir plug 213 are provided with through holes 214. The hollow shaft 25 passes through the two through holes 214 from back to front and is welded to the two through holes 214 to achieve fixation and sealing.

[0079] Preferably, in this embodiment, such as Figure 3 , 4As shown in Figures 5 and 6, an inner extension ring 215 concentric with the through hole 214 is provided at the opposite ends of the first plug 212 and the second plug 213 of the water reservoir. The two ends of the inflatable airbag 29 are respectively inserted through and sealed on the corresponding inner extension ring 215, thereby utilizing the wall thickness of the inner extension ring 215 to form an inflation space 252 between it and the hollow shaft 25. The water inlet 22 is provided on the end face of the first plug 212 of the water reservoir, and the water inlet 22 is connected to the water storage space 210 between the inflatable airbag 29 and the outer shell 21 of the water reservoir.

[0080] The inflation port 23 is located on the end face of the second plug 213 of the water reservoir. Specifically, the inflation port 23 is located on the portion of the second plug 213 located inside its inner extension ring 215, that is, the inflation port 23 is located between the through hole 214 of the second plug 213 and the inner circumference of its inner extension ring 215. This allows the inflation port 23 to connect to the inflation space 252, and the inflation port 23 to communicate with the interior of the inflation airbag 29.

[0081] In this embodiment, an inlet 24 is provided at the position of the second plug 213 of the water reservoir corresponding to the water storage space 210, and the inlet 24 is arranged concentrically with the outlet 22. In this way, water can be introduced into and out of the water storage bag 13 and the water storage space 210 through the inlet 24.

[0082] In this embodiment, as Figure 1 As shown, a connecting pipe 3 is provided at the front end of the water storage housing 21, and a connector 4 is provided at the front end of the connecting pipe 3. The connecting pipe 3 is fixedly installed on the amplifier housing 101 through the connector 4.

[0083] Specifically, the connecting pipe 3 is a steel pipe, which is welded and fixed to the front end of the first plug 212 of the water reservoir. The outer diameter of the connecting pipe 3 is adapted to the outer diameter of the outer shell 21 of the water reservoir. A first capillary steel pipe 26 is provided on the front side of the first plug 212 of the water reservoir at the position corresponding to the water inlet 22. The first capillary steel pipe 26 is located inside the connecting pipe 3.

[0084] The outer periphery of connector 4 has a stepped variable diameter structure with a larger front and a smaller rear. The inner diameter of connector 4 is adapted to the outer diameter of amplifier housing 101. Connector 4 is fitted onto the rear of amplifier housing 101. The smaller diameter section of connector 4 is inserted into the inner cavity of connecting tube 3. A fastening hole is provided at the overlapping position of connecting tube 3 and connector 4. Connecting tube 3 and connector 4 are fastened to screw hole 1012 at the rear of amplifier housing 101 by fixing screws passing through the fastening hole, thereby achieving fixation.

[0085] The rear end of the inlet / outlet pipe 5 is sealed and connected to the front end of the first capillary steel tube 26 of the water inlet 22. The front end of the inlet / outlet pipe 5 passes through the connecting hole 41 and is connected to the water inlet hole 126 of the second plug 122. Specifically, a rubber tube is provided at the front end of the first capillary steel tube 26, and the inlet / outlet pipe 5 is an inlet / outlet rubber tube. The rubber tubes are connected to each other through a quick connector. This allows the water inlet hole 126, the connecting hole 41, and the water inlet 22 to be connected through the inlet / outlet pipe 5, thus connecting the water storage space 210 with the water storage bag 13. At the same time, the protective ring 123 at the rear of the second plug 122 can protect the inlet / outlet pipe 5.

[0086] In this embodiment, as Figure 5 , 6 As shown, a second capillary tube 27 and a third capillary tube 28 are respectively installed at the rear end of the second plug 213 of the water reservoir, corresponding to the air inlet 23 and the water inlet 24. (Refer to...) Figure 12 The second capillary steel tube 27 is connected to an air inlet / outlet pipe 7, and the third capillary steel tube 28 is connected to a water inlet pipe 6. The rear end of the air inlet / outlet pipe 7 extends to connect to an external inflation device, and the water inlet pipe 6 is used to inject water into the water storage bag 13 and the water storage space 210 when no hole test is performed.

[0087] In this embodiment, the rear end of the hollow shaft 25 extends out of the water reservoir housing 21 and has a wire groove 251. The signal line 15 extends rearward through the wire groove 251. A columnar nut 9 is fixedly installed at the rear end of the hollow shaft 25, and a push rod is threaded onto the columnar nut 9. The push rod is used to drive the test probe to move within the hole.

[0088] Preferably, in this embodiment, such as Figure 1 , 7 As shown, a conical guide 8, which is larger at the front and smaller at the back, is fixedly installed at the rear end of the water reservoir 2. The guide 8 is entirely inserted through the hollow shaft 25, exposing the wire groove 251. The front end of the guide 8 is fixedly welded to the rear end of the second plug 213 of the water reservoir, and a second capillary steel tube 27 and a third capillary steel tube 28 are welded thereon. A first guide hole 81 and a second guide hole 82 are respectively opened on the middle circumference of the guide 8 at the positions corresponding to the air inlet 23 and the water inlet 24. The water inlet pipe 6 and the air inlet and outlet pipe 7 extend backward through the corresponding guide holes.

[0089] How to use this application:

[0090] Step 1: Connect signal cable 15 to the external instrument.

[0091] Step 2: Connect the hose connected to the first capillary steel tube 26 to the inlet and outlet hoses on the front side of the water reservoir 2 with a quick connector to achieve the connection between the water reservoir 2 and the water storage bag 13.

[0092] Step 3: Insert the rear end of connector 4 into the front end of connector tube 3 and tighten it with fixing screws to assemble the acoustic wave test probe 1 and water tank 2 into an inflatable dry hole acoustic wave test probe.

[0093] Step 4: Before placing the inflatable dry-hole acoustic wave test probe, ensure that the front end of the acoustic wave test probe 1 is higher than the water reservoir 2. Remove the lifting eye screw 124 and fill the water reservoir 2 with water through the water inlet pipe 6. When water flows out from the front end of the first plug 121, the inside of the water reservoir 2 and the water storage bag 13 will be filled with water, and the air between the vibration pickup assembly 11 and the water storage bag 13 will be completely expelled. At this point, stop filling the water, seal the water inlet 24, and tighten the lifting eye screw 124 to complete the seal, ensuring that the water inside the test probe does not leak out.

[0094] Step 5: Use a quick connector to connect the high-pressure air hose on the air pump to the air inlet and outlet pipe 7 on the right side of the water tank 2.

[0095] Step 6: Send the inflatable dry hole acoustic wave test probe to the test position.

[0096] Step 7: Use an air pump to pump air into the high-pressure air pipe. The water in the water reservoir 2 is squeezed into the water storage bag 13. The water storage bag 13 is in full contact with the hole wall. At this time, the test can be carried out.

[0097] Step 8: After the test is completed, the air is released and the water in the water storage bag 13 flows back to the water storage tank 2. The water storage bag 13 is separated from the hole wall, and the inflatable dry hole acoustic wave test probe can be moved to the next test point. Repeat steps 7 and 8 until the test is completed.

[0098] Step 9: After the test is completed, pull out the test probe, open the eyelet screw 124 and the water inlet 24 to allow all the water inside to flow out freely.

[0099] Step 10: Remove the screws connecting the water tank 2 and the acoustic wave test probe 1. Separate the water tank 2 and the acoustic wave test probe, and reel in the wires to finish the job.

[0100] In summary, by installing a water reservoir 2 at the rear end of the acoustic wave test probe 1, the overall air-filled dry hole acoustic wave test probe can be used for acoustic wave testing of boreholes in various directions without water. No water source is required on-site; only an air pump is needed, making it widely applicable. The water reservoir 2 and the acoustic wave test probe 1 are easily detachable and assembled, facilitating transportation and practicality. Using the signal amplifier 10 ensures that the weak signal from the vibration pickup assembly 11 is transmitted over greater distances without distortion, improving the accuracy and quality of deep hole testing.

[0101] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0102] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0103] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A water reservoir for an inflatable dry-hole acoustic wave test probe, characterized in that, The device includes a water reservoir housing, which is used to be fixedly installed at the rear end of the acoustic wave test probe. An inflatable air bladder is provided inside the water reservoir housing, and a water storage space is formed between the inflatable air bladder and the water reservoir housing. The water reservoir housing is provided with an inflation port that is sealed and connected to the inflatable air bladder, and a water inlet that is sealed and connected to the water storage space. The water inlet is used to be sealed and connected to the water reservoir bag of the acoustic wave test probe. A hollow shaft is installed inside the water reservoir shell, which is used for the signal line of the acoustic wave test probe to pass through. The two ends of the inflatable airbag are respectively sealed and fixed to the two ends of the water reservoir shell, and a sealed inflation space is formed between the inflatable airbag and the hollow shaft. It also includes a signal amplifier, which includes a cylindrical amplifier housing and amplifier elements disposed inside the amplifier housing; the acoustic wave test probe and the water storage tank are respectively fixed at both ends of the amplifier housing, and the acoustic wave test probe and the water storage tank are detachably connected through the signal amplifier.

2. The water reservoir for an inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The water storage tank housing includes a cylindrical housing, with a first water storage plug and a second water storage plug respectively provided at the front and rear ends of the cylindrical housing. Both the first water storage plug and the second water storage plug have through holes in their centers. The hollow shaft passes through the two through holes from back to front and is sealed and fixed to the two through holes.

3. The water reservoir for an inflatable dry-hole acoustic wave test probe according to claim 2, characterized in that, The first and second plugs of the water reservoir are provided with inner extension rings concentric with the through hole at their opposite ends, and the two ends of the inflatable airbag are respectively inserted and sealed on the corresponding inner extension rings.

4. The water reservoir for an inflatable dry-hole acoustic wave test probe according to claim 3, characterized in that, The water inlet is located on the first plug of the water reservoir, and the air inlet is located on the second plug of the water reservoir, specifically on the portion of the second plug located within its inner extension ring.

5. The water reservoir for an inflatable dry-hole acoustic wave test probe according to claim 4, characterized in that, The second plug of the water storage device has an inlet corresponding to the position of the water storage space. The inlet and the outlet are arranged concentrically and are connected to the water storage space.

6. The water reservoir for an inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The front end of the water storage tank shell is provided with a connecting pipe, and the front end of the connecting pipe is provided with a connector. The connector has a connecting hole at the position corresponding to the water inlet, and the connecting hole is connected to the water inlet through an inlet and outlet pipe.

7. The water reservoir for an inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The rear end of the water storage tank shell is provided with a guide. The guide is a conical structure that is larger at the front and smaller at the back. The rear end of the guide is fixedly connected to a hollow shaft. The middle circumference of the guide is provided with a first guide opening corresponding to the air inlet. An air inlet and outlet pipe passes through the first guide opening. The front end of the air inlet and outlet pipe is connected to the air inlet.

8. The water reservoir for an inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The rear end of the hollow shaft extends out of the water tank housing and has a groove. A columnar nut is fixedly installed at the rear end of the hollow shaft, and a push rod is threaded onto the columnar nut.

Images