Cable detection device

Abstract

The invention discloses a cable detection device, belongs to the technical field of cable production, and aims to solve the problems that the flexible skin of a cable is compressed due to continuous pressurization, conductive liquid is more difficult to enter a damaged gap of the cable, and the detection precision is influenced. According to the technical scheme, the device is characterized in that the device comprises a detection box and a pressurization cavity formed in the detection box, the detection box and the pressurization cavity are both fixedly connected with wire guide wheels, a cable transmission line is formed through the wire guide wheels, and the pressurization cavity is connected with a pressurization mechanism which comprises a pressurization container, a piston and a reciprocating pushing assembly; the reciprocating pushing assembly drives the piston to reciprocate. According to the invention, through the composite propulsion effect of pulse pressure waves and bidirectional flow, the liquid penetration depth is increased by 40%, the detection blind area of the traditional soaking method on the false closing defects such as oxide layer covering cracks and impurity blocking cracks is successfully broken through, and the detection blind area is reduced by 60%-70%.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable production, and more particularly, relates to a cable detection device. Background Art

[0002] Cables are wires made of conductive materials used to transmit power, communication signals, or data. To ensure proper operation and safe use, cables require various tests and inspections. To determine whether the cable's sheath is damaged and the insulation quality, the cable is typically immersed in a conductive liquid to energize the cable. The test then checks the water to determine if the liquid is charged.

[0003] The existing announcement number is CN116540042B, the announcement date is September 8, 2023, and the name is a Chinese patent for a cable detection device. In order to avoid the situation where water flow is difficult to enter due to minor cable damage, so that the leakage current can be detected normally during subsequent inspections, the test water is pressurized through the booster component so that the test water can quickly enter the defective position of the cable.

[0004] The above technical solution pressurizes the test water in the booster box so that the test water can quickly enter the defective position of the cable, ensuring the accuracy of the cable insulation test. At the same time, it can shorten the cable immersion time and improve the efficiency of the cable insulation test. However, continuous pressurization may cause the flexible skin of the cable to be compressed, thereby enhancing the sealing effect of the damaged position of the cable, and making it more difficult for the conductive liquid to enter the damaged gap of the cable. In this case, the accuracy of the final test result will be affected.

[0005] Therefore, new solutions need to be proposed to solve this problem. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a cable detection device in order to solve the above problems.

[0007] The present invention achieves the above-mentioned object through the following technical solution: a cable detection device, comprising a detection box and a pressurizing chamber provided inside the detection box, wherein the detection box and the pressurizing chamber are both fixedly connected to a wire pulley, through which a cable transmission route is formed, and the pressurizing chamber is connected to a pressurizing mechanism, which comprises: a pressurized container, communicating with the inner cavity of the pressurized chamber; A piston is slidably disposed inside the pressurized container and is used to change the capacity of the space connecting the pressurized container and the pressurized chamber; A reciprocating push assembly, used for changing the position of the piston inside the pressurized container, wherein the reciprocating push assembly is connected to the piston; The reciprocating pushing assembly drives the piston to move back and forth, so that the spatial capacity of the boosting container connecting the boosting chamber changes. When the spatial capacity of the boosting container is the largest, the boosting chamber is in a low-pressure state. When the spatial capacity of the boosting container is the smallest, the boosting chamber is in a high-pressure state.

[0008] The present invention is further configured as follows: the boosting chamber is connected to a low-pulsation circulation pump, and the inner cavity of the boosting chamber is configured as a tubular cavity structure, wherein the two ends of the boosting chamber connected to the low-pulsation circulation pump are respectively connected to the head and tail ends of the tubular cavity structure.

[0009] The present invention is further configured such that: the low-pulsation circulation pump is started when the boosting chamber is in a low-pressure state, so as to circulate the conductive liquid inside the boosting chamber.

[0010] The present invention is further configured such that the low-pulsation circulation pump forms a two-way flow diversion mode in the boosting chamber.

[0011] The present invention is further configured as follows: a pressure buffer is fixedly connected to the inside of the boost chamber for buffering the pressure impact of the conductive liquid flow in the low-pulsation circulation pump.

[0012] The present invention is further configured as follows: four cable deformation mechanisms are arranged in the boost chamber, the four cable deformation mechanisms are distributed around the outer circumference of the cable, and the cable deformation mechanisms are staggered, and the cable deformation mechanisms abut against the outer side wall of the cable to form a bent state of the cable.

[0013] The present invention is further configured as follows: the cable deformation mechanism includes: A base, fixedly connected to the inner wall of the boost chamber; The bending wheel is used for abutting against the outer side wall of the cable, and the bending wheel is rotatably arranged on the base.

[0014] The present invention is further configured as follows: the cable deformation mechanism further includes: A sliding seat is provided at the connection between the base and the bending wheel, and the sliding seat is slidably provided on the base; A propulsion rod is slidably disposed on the base, and the propulsion rod is fixedly connected to the sliding seat; An elastic member pushes the push rod to slide away from the sliding seat, and two ends of the elastic member are respectively in contact with the push rod and the base; The base is provided with a sealing channel connected to the boost chamber at the position corresponding to the elastic part. An opening is provided at the connection point of the sealing channel. One end of the push rod is slidably sealed at the opening. When the pressure of the conductive liquid inside the boost chamber increases, the push rod is pressurized and moves in the direction of the compressed elastic part.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, through the combined propulsion effect of pulsed pressure waves and bidirectional flow, the liquid penetration depth is increased by 40%, successfully breaking through the traditional immersion method's blind spot for detecting "falsely closed" defects such as oxide layer-covered cracks and impurity-blocked cracks, reducing the detection blind spot by 60%-70%. Secondly, the micro-bubble collapse effect induced by pressure waves (micro-jet velocity reaches 100m / s) is used to achieve nano-level cleaning of the crack surface, increasing the effective penetration area of micropores with an initial opening size of only 10μm by 30%-50% after testing. Third, the hydraulic feedback mechanism of the propulsion rod and elastic member reduces the axial deformation of the cable to ≤5%, achieving a breakthrough of "longitudinal extension to release stress and radial zero compression" during the 1.5MPa pressurization process, completely solving the problem of enhanced skin sealing caused by traditional pressurization. Fourth, in the low-pressure stage (pressure < 0.1 MPa), a 0.1 m / s laminar flow is initiated to form a "pulse propulsion" penetration mechanism. Compared with the continuous pressurization scheme, the liquid penetration rate is increased by 2 times, while avoiding high pressure interference with pressure wave propagation. Fifth, the bidirectional flow mode improves the uniformity of liquid ion distribution by 30%, and combined with the interference isolation of the pressure buffer, the stability of the conductivity detection signal is 2.5 times that of traditional methods; Sixth, the combined effect of phased flow and pressure waves reduces the cable inspection time per unit length from the industry average of 60 minutes to less than 30 minutes, reducing energy consumption by 50% (<0.2kWh / m); Seventh, the bending wheel's 10-15 times diameter bending radius design, combined with the four-quadrant staggered arrangement, activates the cracks while ensuring that the cable's internal structural stress is less than 30% of the material's yield strength, thus avoiding secondary damage to the insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 It is a schematic cross-sectional view of the present invention; Figure 4 It is a structural diagram of the pressurizing mechanism; Figure 5 Schematic diagram of the cable deformation mechanism.

[0017] Figure numerals: 1. Detection box; 2. Pressurization chamber; 3. Wire pulley; 4. Pressurization container; 5. Piston; 6. Low-pulsation circulation pump; 7. Pressure buffer; 8. Cable deformation mechanism; 9. Base; 10. Bending wheel; 11. Sliding seat; 12. Propelling rod; 13. Elastic part. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example

[0019] A cable detection device, such as Figure 1-Figure 5 As shown, it includes a test box 1 and a pressurized chamber 2 opened inside the test box 1. The test box 1 adopts a split structure (box + cover) to facilitate cable routing. The box and cable interface is equipped with a double fluororubber O-ring sealing structure, combined with the pressure balance hole design, to achieve a leakage rate of ≤1×10 -5 Pa·m³ / s (according to ISO 15848-1 standard), ensuring high pressure stability in boost chamber 2.

[0020] A wire pulley 3 is fixedly connected inside and outside the detection box 1, and a cable transmission route is formed by the wire pulley 3. A detection instrument for detecting whether the conductive liquid is charged is also fixedly connected in the boost chamber 2, so that it can be known whether the cable sheath is damaged through the detection instrument.

[0021] The boosting chamber 2 is connected to a pressurizing mechanism, which includes a boosting container 4, a piston 5 and a reciprocating push assembly, wherein the boosting container 4 is connected to the inner cavity of the boosting chamber 2, so that when the conductive liquid is injected into the boosting chamber 2, the conductive liquid will also flow into the boosting container 4, and the piston 5 is slidably arranged inside the boosting container 4 to change the space capacity of the boosting container 4 and the boosting chamber 2, and the reciprocating push assembly is connected to the piston 5 to change the position of the piston 5 inside the boosting container 4, thereby driving the piston 5 to move back and forth through the reciprocating push assembly to make the boosting container 4. The spatial capacity of the boosting chamber 2 changes. When the spatial capacity of the boosting container 4 is the largest, the conductive liquid in the boosting chamber 2 is in a low-pressure state. When the spatial capacity of the boosting container 4 is the smallest, the conductive liquid in the boosting chamber 2 is in a high-pressure state, thereby periodically applying pressure to the cable to form a pulse pressure. At the same time, the pulse pressure will cause the cable skin to vibrate, reducing the friction coefficient between the liquid and the crack surface by 30%-50%, improving the liquid fluidity, accelerating the diffusion of ions in the liquid, reducing concentration polarization, making the conductivity detection signal more uniform, and improving the detection accuracy.

[0022] The impact pressure generates a pressure wave. This pulsed pressure wave creates a transient negative pressure zone at the crack entrance. When the local pressure falls below the saturated vapor pressure of the liquid, dissolved gases or tiny cavitation nuclei rapidly expand to form microbubbles (cavitation effect). When these bubbles collapse, they release microjets that impact the crack surface. These bubbles quickly collapse in the high-pressure zone, generating microjets (at speeds up to 100 m / s) that directly impact the crack surface, removing impurities and widening the crack entrance. The pressure wave repeatedly reflects within the crack, creating an alternating pressure field. At peak pressure, the liquid is "pressed" into the crack; during low-pressure valleys, the liquid continues to move forward due to inertia, creating a "pulse propulsion" effect, further achieving inertial penetration. This effectively avoids the problem of conventional continuous pressurization, which can lead to enhanced sealing at the damaged cable site, making it more difficult for conductive liquids to enter the damaged cable, thereby improving detection accuracy.

[0023] At the same time, the vibration of the cable skin caused by the pulse pressure (frequency 10-100Hz) reduces the friction coefficient between the liquid and the crack surface by 30%-50%, improves the fluidity of the liquid, and the vibration accelerates the diffusion of ions in the liquid, reduces concentration polarization, makes the conductivity detection signal more uniform, and further improves the detection effect.

[0024] In addition, periodic pressure changes cause the cracks to open and close periodically (with an amplitude of up to micron level). At the peak pressure, the crack opening angle increases by 20%-40%, providing more entry channels for the liquid. The pulse pressure causes the liquid in the crack to shrink and expand periodically, forming a capillary drive effect similar to "pump suction", which promotes the liquid to penetrate into tiny pores and activate "pseudo-closed" cracks (cracks blocked by oxidation or impurities), reducing the detection blind area by 60%-70%.

[0025] The reciprocating driving component can be driven by a cylinder, and the design life of the cylinder drive mechanism is ≥10 6 The cylinder has the characteristics of quick action and quick response, which can better meet the needs of use.

[0026] The boost chamber 2 is connected to a low-pulsation circulation pump 6, which allows the conductive liquid in the boost chamber 2 to flow slowly (the flow rate can be controlled at 0.05-0.15m / s) to avoid bubbles or vibrations interfering with the detection. At the same time, the detection electrodes of the detection instrument are embedded in the wall of the detection box 1, isolated from the flowing liquid, and only contacting the liquid through small holes, which not only ensures conductivity detection but also avoids electrode polarization caused by flow, thereby improving detection accuracy.

[0027] In addition, the inner cavity of the boosting chamber 2 is set as a tubular cavity structure, wherein the two ends of the boosting chamber 2 are connected to the low-pulsation circulation pump 6 and are respectively connected to the head and tail ends of the tubular cavity structure, so that the flow direction of the conductive liquid is along the axial direction of the cable. The axial flow causes the liquid to move along the length direction of the cable, forming a "brush" effect, continuously sweeping the crack entrance, reducing the risk of impurity blockage, and when the pulse pressure wave propagates in the liquid, the axial flow can guide the pressure wave to penetrate deeper along the crack direction, forming a composite propulsion effect of "pressure wave + flow".

[0028] Moreover, axial flow makes the ion distribution in the liquid more uniform, reduces concentration polarization, and makes the conductivity detection signal more stable. Axial flow can reduce liquid turbulence, reduce the interference of flow noise on the detection signal, and further improve the detection accuracy.

[0029] At the same time, the low-pulsation circulation pump 6 is started when the boosting chamber 2 is in a low-pressure state, so that the conductive liquid inside the boosting chamber 2 circulates, thereby starting to flow when the pulse pressure is in a low-pressure valley (the pressure is close to the ambient pressure). The liquid continues to penetrate deep into the crack due to inertia, forming a "pulse propulsion" effect. In the high-pressure stage, the liquid has been pressed into the crack. If it flows at this time, it will interfere with the propagation of the pressure wave; while in the low-pressure stage, the flow can replenish the liquid and maintain the continuity of penetration, thereby improving the detection accuracy.

[0030] In addition, under a pulse pressure of 0.5MPa (50Hz, duty cycle 40%), 0.1m / s laminar flow was started in the low-pressure stage (pressure <0.1MPa). The parameter matching was verified through computational fluid dynamics simulation, which showed that the penetration depth increased by 40% and the signal-to-noise ratio increased by 2.5 times. At the same time, compared with continuous flow, starting the staged flow in the low-pressure stage can shorten the detection time by 30% and reduce energy consumption by 50%.

[0031] The low-pulsation circulating pump 6 creates a bidirectional flow pattern (e.g., a sinusoidal flow) within the booster chamber 2. Bidirectional flow enhances the liquid's flushing of the crack surface by periodically changing the flow direction (e.g., a sinusoidal flow pattern). This mechanism, similar to the "sweeping effect" in fluid mechanics, significantly reduces the friction coefficient between the liquid and the crack surface. This repeatedly flushes the open crack, removing impurities and allowing liquid to penetrate more easily. Furthermore, the pulse pressure method generates pressure waves, pushing the liquid into the crack. Bidirectional flow synergizes with the pressure wave to create a combined "pressure wave + flow" propulsion effect, further improving liquid penetration efficiency. Simultaneously, the flow rate is 0.05-0.15 m / s, effectively avoiding the generation of bubbles or vibrations that interfere with detection.

[0032] A pressure buffer 7 is fixedly connected to the inside of the boost chamber 2, and the pressure buffer 7 isolates the mutual interference between the flow and the pressure wave, thereby ensuring the penetration effect.

[0033] Four cable deformation mechanisms 8 are installed within the pressurization chamber 2. These mechanisms abut the outer wall of the cable, forcing the cable into a curved state. When the cable bends, tensile stress is applied to the outer side and compressive stress is applied to the inner side. If the damaged notch is located on the tensile side, the notch may open due to the stretching (increasing the opening size by 10%-50%), creating a larger liquid permeation channel. This increases the contact area between the liquid and the crack, improving the permeation rate. Furthermore, the opened crack reduces the tortuosity of the liquid flow path, lowering resistance and further improving permeation efficiency.

[0034] At the same time, four cable deformation mechanisms 8 are distributed in a ring array on the outer circumference of the cable, and adjacent mechanisms are arranged 90° apart along the axial direction to ensure that each quadrant of the cable surface forms a bending deformation.

[0035] Bending can activate "pseudo-closed" cracks (cracks blocked by oxidation or impurities), reducing detection blind areas by 60%-70%. The exposure of crack branches can avoid defects missed by traditional methods. In addition, the bent and opened cracks provide a larger action area for the pulse pressure wave, and the impact effect of the pressure wave is more significant. At the same time, the periodic changes in the crack opening (due to pulse pressure) are superimposed on the static opening caused by bending, forming a "dynamic-static" composite penetration effect.

[0036] The cable deforming mechanism 8 includes a base 9 fixedly connected to the inner wall of the boost chamber 2 and a bending wheel 10 for abutting the outer wall of the cable. The bending wheel 10 is rotatably set on the base 9 to ensure the normal transmission effect of the cable. At the same time, the bending wheel 10 makes the bending radius of the cable 10-15 times the cable diameter, thereby avoiding the problem that the bending radius is too small and may cause damage to the internal structure of the cable. At the same time, the four cable deforming mechanisms 8 are arranged at intervals, and there is a certain distance between each cable deforming mechanism 8. Each distance is greater than 2 times the cable diameter, avoiding local stress concentration, so that the detection limit can be pushed to 0.05mm micropores, while avoiding cable damage caused by excessive bending.

[0037] The cable deforming mechanism 8 also includes a sliding seat 11 arranged at the connection between the base 9 and the bending wheel 10, a push rod 12 slidably arranged on the base 9, and an elastic member 13 whose two ends are respectively abutted against the push rod 12 and the base 9. The base 9 is provided with a sealed channel connected to the boost chamber 2 at the position corresponding to the elastic member 13. An opening is opened at the connection point of the sealed channel. One end of the push rod 12 slides and seals at the opening. When the pressure of the conductive liquid inside the boost chamber 2 increases, the push rod 12 is pressurized and moves in the direction of the compressed elastic member 13, thereby driving the bending wheel 10 to move further in the direction of fitting the cable, thereby providing a deformation basis for the axial deformation of the cable, ensuring that the cable can produce an axial deformation of about 5% during the pressurization process, releasing the internal stress generated by the pressurization through longitudinal deformation, preventing radial compression, and effectively avoiding the problem of compression of the flexible skin of the cable.

[0038] Working principle: When the insulation of the cable needs to be tested, first open the boosting chamber 2, then wind the cable around the wire pulleys 3 and the bending wheel 10, then add conductive liquid into the boosting chamber 2 so that the conductive liquid submerges the cable, and then cover the boosting chamber 2, wherein the bending wheel 10 is used to make the cable form a bent state, and then input voltage to the cable.

[0039] Then the reciprocating pushing assembly is started, and the reciprocating pushing assembly pushes the piston 5 to slide and reduces the space capacity connecting the boosting container 4 and the boosting chamber 2, so that the boosting chamber 2 is in a transition to a high-pressure state, and in the process of transitioning to a high-pressure state, due to the increase in the hydraulic pressure of the conductive liquid, the propulsion rod 12 is pressurized and moves in the direction of the compression elastic member 13, thereby driving the sliding seat 11 to move toward the direction of the cable, so that the bending wheel 10 abuts the cable while increasing the degree of bending of the cable, and then the cable forms an axial deformation, allowing the cable to release pressure by becoming longer instead of being flattened, thereby effectively slowing down the compression of the flexible skin of the cable.

[0040] Then, after reaching the high-pressure state, the reciprocating pushing assembly drives the piston 5 to reset its position, so that when the boosting chamber 2 is in a transition to a low-pressure state, the liquid in the crack will produce periodic contraction and expansion, forming a capillary driving effect similar to "pump suction", which promotes the liquid to penetrate into the tiny pores. After reaching the low-pressure state, the low-pulsation circulation pump 6 is started to circulate the conductive liquid inside the boosting chamber 2 in a two-way flow mode, which can cooperate with the pressure wave to form a composite propulsion effect of "pressure wave + flow", further improving the penetration efficiency of the liquid. During this process, personnel can complete the cable detection work by using an external ammeter to detect whether the boosting chamber 2 is energized.

[0041] After this section of cable is inspected, the motor is started again to drive the wire pulley 3 at the starting position to be transported for the next stage of cable inspection.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0043] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A cable detection device, characterized in that: The invention comprises a detection box (1) and a pressurizing chamber (2) opened inside the detection box (1); the detection box (1) is fixedly connected to a wire pulley (3) inside and outside, and a cable transmission route is formed by the wire pulley (3); the pressurizing chamber (2) is connected to a pressurizing mechanism, and the pressurizing mechanism comprises: A pressurized container (4) is in communication with the inner cavity of the pressurized chamber (2); A piston (5) is slidably disposed inside the pressurized container (4) and is used to change the capacity of the space communicating between the pressurized container (4) and the pressurized chamber (2); A reciprocating push assembly, used for changing the position of the piston (5) inside the pressurized container (4), the reciprocating push assembly being connected to the piston (5); The piston (5) is driven to move back and forth by the reciprocating push assembly, so that the space capacity of the boosting container (4) connected to the boosting chamber (2) changes. When the space capacity of the boosting container (4) is maximum, the boosting chamber (2) is in a low-pressure state. When the space capacity of the boosting container (4) is minimum, the boosting chamber (2) is in a high-pressure state.

2. A cable detection device according to claim 1, characterized in that: The boosting chamber (2) is connected to a low-pulsation circulation pump (6), and the inner cavity of the boosting chamber (2) is configured as a tubular cavity structure, wherein the two ends of the boosting chamber (2) connected to the low-pulsation circulation pump (6) are respectively connected to the head and tail ends of the tubular cavity structure.

3. A cable detection device according to claim 2, characterized in that: The low-pulsation circulation pump (6) is started when the boosting chamber (2) is in a low-pressure state, so as to circulate the conductive liquid inside the boosting chamber (2).

4. A cable detection device according to claim 3, characterized in that: The low-pulsation circulation pump (6) forms a diversion mode of a bidirectional flow pattern in the boosting chamber (2).

5. A cable detection device according to claim 4, characterized in that: A pressure buffer (7) is fixedly connected to the interior of the boosting chamber (2) and is used to buffer the pressure impact of the conductive liquid flow of the low-pulsation circulation pump (6).

6. A cable detection device according to any one of claims 1 to 5, characterized in that: Four cable deformation mechanisms (8) are arranged in the boost chamber (2), and the four cable deformation mechanisms (8) are distributed around the outer circumference of the cable, and the cable deformation mechanisms (8) are staggered. The cable deformation mechanisms (8) abut against the outer wall of the cable to form a bent state of the cable.

7. A cable detection device according to claim 6, characterized in that: The cable deformation mechanism (8) comprises: A base (9) is fixedly connected to the inner wall of the boost chamber (2); The bending wheel (10) is used for abutting against the outer wall of the cable, and the bending wheel (10) is rotatably arranged on the base (9).

8. A cable detection device according to claim 7, characterized in that: The cable deformation mechanism (8) further comprises: A sliding seat (11) is arranged at a connection between the base (9) and the bending wheel (10), and the sliding seat (11) is slidably arranged on the base (9); A propulsion rod (12) is slidably disposed on the base (9), and the propulsion rod (12) is fixedly connected to the sliding seat (11); An elastic member (13), two ends of which respectively abut against the propulsion rod (12) and the base (9), and are used to push the propulsion rod (12) to move in a direction away from the sliding seat (11); The base (9) is provided with a sealing channel connected to the boost chamber (2) at a position corresponding to the elastic member (13), and an opening is provided at the connection point of the sealing channel. One end of the propulsion rod (12) is slidably sealed at the opening. When the pressure of the conductive liquid inside the boost chamber (2) increases, the propulsion rod (12) is pressurized and moves in the direction of compressing the elastic member (13).

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