Energy storage power station assembled cable trench flexible sealing connection structure

Abstract

The present application relates to the technical field of power facility construction, and especially relates to a flexible sealing connection structure of an assembled cable trench of an energy storage power station, which comprises at least two abutting trench bodies; a sealing body is arranged between the two trench bodies; wherein the sealing body comprises an intermediate sealing part and an outer sealing part, the intermediate sealing part is between the two trench bodies, and the outer sealing part covers at least a part of the inner wall of the two trench bodies; a fixing mechanism is further arranged in the trench body, in the present application, the intermediate sealing part is clamped between the end faces of the two trench bodies, so that the direct plugging of the joint gap is realized, and the first sealing barrier is formed; meanwhile, the outer sealing part is arranged on the inner wall of the two trench bodies, even if the end face sealing leaks slightly due to long-term use or extreme working conditions, the water seepage can be blocked outside the cable trench by the outer sealing part and cannot enter the trench interior. The two sealing parts work together, and the waterproof grade is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of power facility construction technology, and in particular to a flexible sealed connection structure for prefabricated cable trenches in energy storage power stations. Background Technology

[0002] Prefabricated cable trenches have been widely used in energy storage power stations and substation projects due to their advantages such as fast construction speed and controllable quality. Prefabricated cable trenches are typically assembled on-site from multiple prefabricated trench sections, and the joints between adjacent trench sections require waterproof sealing. If the seal is unreliable, surface water or groundwater can seep into the cable trench along the joints, leading to decreased cable insulation, corrosion of metal components, and in severe cases, potentially causing electrical safety accidents.

[0003] Currently, joint sealing in prefabricated cable trenches mainly employs two methods: rigid sealing by injecting cement mortar or sealant, and flexible sealing by laying ordinary rubber gaskets. However, rigid seals are ill-suited to structural deformation caused by foundation settlement and temperature changes, easily leading to cracking and failure. While ordinary rubber gaskets offer flexibility, they lack a reliable clamping mechanism during installation, and relying solely on end-face compression cannot guarantee a long-term stable sealing pressure. Furthermore, traditional sealing structures often only have one end-face seal; once the seal ages or is partially damaged, the seepage path becomes directly open. In addition, existing sealing structures have poor adaptability to trench manufacturing tolerances and installation errors, requiring high construction standards and presenting difficulties for subsequent maintenance.

[0004] Therefore, in order to solve the above problems, we propose a flexible sealed connection structure for prefabricated cable trenches in energy storage power stations. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as traditional sealing structures often only having one end face seal, which allows water to directly penetrate once the seal body ages or is partially damaged. Therefore, this invention proposes a flexible sealing connection structure for prefabricated cable trenches in energy storage power stations.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Design a flexible sealed connection structure for prefabricated cable trenches in an energy storage power station, comprising at least two opposing trench bodies; A sealing body is placed between the two groove bodies; The sealing body includes an intermediate sealing portion and an outer sealing portion, with the intermediate sealing portion between two groove bodies, and the outer sealing portion covering at least a portion of the inner wall of the two groove bodies; A fixing mechanism is also installed inside the groove body, and the two fixing mechanisms are used to fix the two sides of the outer sealing part respectively.

[0007] Furthermore, both the intermediate sealing portion and the outer sealing portion have a U-shaped structure, and the outer sealing portion extends along the inner side surface of the intermediate sealing portion toward the direction in which the two groove bodies are laid.

[0008] Furthermore, the fixing mechanism includes: The lower compression rod and two side compression rods; A U-shaped groove is formed on the inner side of the groove body. The lower pressure rod is placed on the bottom surface of the U-shaped groove, and the two side pressure rods are respectively placed on the two sides of the U-shaped groove. The lower pressure rod and the two side pressure rods respectively abut against the outer side of the outer sealing part.

[0009] Furthermore, inclined grooves are provided on both sides of the bottom of the lower pressure rod, and a guide post is provided at the bottom of the side pressure rod, with the guide post slidably connected in the inclined groove.

[0010] Furthermore, the guide post includes: The column and the locking protrusion formed on the end of the column; The end face of the latch is provided with a deformation groove that extends into the column, and the latch stops on the outside of the pressure rod.

[0011] Furthermore, a force-relief plate is formed at the bottom of the side pressure rod. The force-relief plate has a Z-shaped structure, and the guide post is fixed to the inner side of the force-relief plate.

[0012] Furthermore, several ribs are formed on both sides of the intermediate sealing part, and the cross-section of the ribs is an inverted triangular structure.

[0013] Furthermore, the interior of the intermediate sealing part and the outer sealing part are respectively provided with an air cavity and an expansion cavity, the air cavity and the expansion cavity are connected, and the lower pressure rod and the two side pressure rods all abut against the air cavity.

[0014] Furthermore, a mounting ear plate is also provided on the end face of the side pressure rod, and the mounting ear plate is fixedly connected to the groove body by fasteners.

[0015] Furthermore, one end of the groove body is provided with an adapter groove, and the other end is formed with a mating protrusion, the mating protrusion and the adapter groove being inserted and adapted.

[0016] The present invention proposes a flexible sealing connection structure for prefabricated cable trenches in energy storage power stations. The advantages are as follows: By setting an intermediate sealing part between the end faces of two trench bodies, the joint gap is directly sealed, forming the first sealing barrier. Simultaneously, an outer sealing part covers the inner walls of the two trench bodies. Even if minor leakage occurs due to long-term use or extreme operating conditions at the end faces, the seepage water will be blocked outside the cable trench by the outer sealing part, preventing it from entering the trench interior. The synergistic effect of these two seals significantly improves the waterproof rating. Secondly, the sealing body is made of flexible elastic material. The middle sealing part can be compressed and deformed, while the outer sealing part can tightly fit the inner wall of the trench. This flexible structure allows for a certain degree of axial or radial assembly deviation when the two trenches are joined. At the same time, when relative displacement occurs due to temperature changes or slight settlement of the foundation during the use of the cable trench, the sealing body can still maintain effective compression and fit, avoiding the tearing or leakage problems common to rigid seals. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the installation of the fixing mechanism of the present invention; Figure 3 This is a schematic diagram of the exploded structure of the present invention; Figure 4 This is a schematic diagram of the fixing mechanism structure of the present invention; Figure 5 This is a schematic diagram of the sealing body structure of the present invention; Figure 6 This is a schematic diagram of the breaking force relief plate structure of the present invention; Figure 7 This is a schematic diagram of the air cavity structure of the present invention.

[0018] In the diagram: 1. Groove body; 10. U-shaped groove; 11. Adaptor groove; 12. Butt joint protrusion; 2. Sealing body; 21. Middle sealing part; 22. Outer sealing part; 23. Rib; 24. Air cavity; 25. Expansion cavity; 3. Fixing mechanism; 31. Lower pressure rod; 32. Side pressure rod; 33. Inclined groove; 34. Guide post; 341. Column; 342. Locking protrusion; 343. Deformation groove; 35. Force relief plate; 36. Mounting ear plate. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-7As an embodiment of the present invention, a flexible sealing connection structure for prefabricated cable trenches in an energy storage power station is disclosed. The structure is characterized by comprising at least two opposing trench bodies 1, which are joined end to end along the cable laying direction and can be connected by fasteners such as tie rods, with a sealing gap between them; a sealing body 2 is placed between the two trench bodies 1. The sealing body 2 includes a middle sealing part 21 and an outer sealing part 22. The middle sealing part 21 is sandwiched between the end faces of the two trench bodies 1, so that the middle sealing part 21 is in an axially compressed state after installation. The outer sealing part 22 covers at least a portion of the inner wall of the two trench bodies 1. The outer sealing part 22 extends from the inner edge of the middle sealing part 21, i.e., towards the inside of the cable trench, and covers at least a portion of the inner wall of the two trench bodies 1. In this embodiment, the outer sealing part 22 is completely attached to the bottom and side surfaces of the inner wall of the trench body 1, forming a continuous waterproof layer. A fixing mechanism 3 is also installed inside the groove body 1. Two fixing mechanisms 3 are used to fix the two sides of the outer sealing part 22 respectively. One fixing mechanism 3 is provided in each groove body 1. The two fixing mechanisms 3 are used to press the two side edges of the outer sealing part 22 from the left and right sides respectively. The fixing mechanism 3 is detachably fixed to the inner wall of the groove body 1 by bolts or embedded parts.

[0021] In other words, this invention uses an intermediate sealing part 21 sandwiched between the end faces of the two trench bodies 1 to directly seal the joint gap, forming the first sealing barrier. Simultaneously, an outer sealing part 22 covers the inner walls of the two trench bodies 1. Even if minor leakage occurs due to long-term use or extreme operating conditions, the water will be blocked outside the cable trench by the outer sealing part 22 and cannot enter the trench. The two seals work together to significantly improve the waterproof rating. Secondly, the sealing body 2 is made of a flexible elastic material. The intermediate sealing part 21 can be compressed and deformed, and the outer sealing part 22 can tightly fit the inner wall of the trench body 1. This flexible structure allows for a certain degree of axial or radial assembly deviation when the two trench bodies 1 are joined. Furthermore, even when relative displacement occurs due to temperature changes or slight ground settlement during cable trench use, the sealing body 2 can still maintain effective compression and fit, avoiding the tearing or leakage problems common with rigid seals.

[0022] In some embodiments, the intermediate sealing portion 21 and the outer sealing portion 22 of the present invention are both U-shaped structures, and the outer sealing portion 22 extends along the inner side surface of the intermediate sealing portion 21 toward the direction in which the two groove bodies 1 are laid.

[0023] The outer sealing part 22 extends integrally from the inner side of the middle sealing part 21, that is, the side close to the inside of the cable trench, and extends horizontally to the left and right sides in the direction of laying the two trench bodies 1.

[0024] In this embodiment, the sealing body 2 is integrally molded using EPDM rubber or silicone rubber. EPDM rubber has excellent ozone resistance, heat aging resistance, and UV resistance, with a compression set of no more than 20%, making it suitable for long-term outdoor or semi-outdoor energy storage power station environments. Alternatively, neoprene rubber or thermoplastic elastomer (TPE) can be selected depending on the actual operating conditions.

[0025] During installation, the sealing body 2 is placed between the end faces of the two groove bodies 1, so that the U-shaped middle sealing part 21 completely covers the butt joint of the two end faces, while the outer sealing parts 22 on the left and right sides naturally fit against the bottom and side walls of the inner wall of the groove body 1. Since the middle sealing part 21 and the outer sealing parts 22 are both U-shaped and connected, a continuous arc transition is formed between them, with no stress concentration points. When the fixing mechanism 3 presses against the edge of the outer sealing part 22, the outer sealing part 22 undergoes elastic deformation, which in turn drives the middle sealing part 21 to press further against the butt joint, achieving bidirectional self-tightening in both the axial and radial directions.

[0026] In a preferred embodiment, the fixing mechanism 3 of the present invention includes: The lower pressure rod 31 and two side pressure rods 32 are both long strip rigid components, which can be made of stainless steel, galvanized steel or aluminum alloy. Their length direction is consistent with the width direction of the trench body 1. A U-shaped groove 10 is formed on the inner side of the trench body 1. The U-shaped groove 10 extends continuously along the bottom surface and two sides of the inner wall of the trench body 1, forming a groove with an opening facing the inside of the cable trench. Specifically, the bottom surface of the U-shaped groove 10 is located at the bottom of the inner wall of the trench body 1, and the two sides of the U-shaped groove 10 are located on both sides of the inner wall of the trench body 1. The lower pressure rod 31 is placed on the bottom surface of the U-shaped groove 10, and the two side pressure rods 32 are placed on the two sides of the U-shaped groove 10, wherein the lower pressure rod 31 and the two side pressure rods 32 respectively abut against the outer side of the outer sealing part 22.

[0027] During installation, first, the outer sealing part 22 of the sealing body 2 is attached to the inner wall of the groove body 1, covering the area of ​​the U-shaped groove 10. Then, the lower pressure rod 31 is placed on the bottom surface of the U-shaped groove 10 and pressed against the outside of the outer sealing part 22. Next, the two side pressure rods 32 are placed on the two sides of the U-shaped groove 10 and similarly pressed against the outside of the outer sealing part 22. At this time, the lower pressure rod 31 applies a downward pressing force to the bottom surface of the outer sealing part 22, and the two side pressure rods 32 apply a lateral pressing force towards the inner wall of the groove body 1 to the two sides of the outer sealing part 22.

[0028] The outer sealing part 22 is firmly fixed in the U-shaped groove 10 and tightly fitted to the inner wall of the groove body 1 by the pressure rod 31 and the two side pressure rods 32 respectively from the bottom and the two sides. This structure realizes multi-directional limiting of the outer sealing part 22 and prevents the sealing body 2 from shifting or warping due to vibration or temperature changes during use.

[0029] Based on the above embodiments, in this embodiment, the bottom of the pressure rod 31 is provided with inclined grooves 33 on both sides. The inclined grooves 33 extend along the length of the pressure rod 31, and their cross-section is rectangular or trapezoidal. The bottom surface of the inclined grooves 33 is inclined relative to the horizontal plane, and the inclination angle is preferably 30 degrees to 60 degrees. The two inclined grooves 33 are located at the bottom left and bottom right sides of the pressure rod 31, respectively, and are symmetrically distributed. The bottom of the side pressure rod 32 is provided with a guide post 34. The guide post 34 is slidably connected in the inclined groove 33. The outer contour size of the guide post 34 is adapted to the inner contour size of the inclined groove 33, so that the guide post 34 can be inserted into the inclined groove 33 and slide along the inclined bottom surface of the inclined groove 33.

[0030] During installation, first place the lower pressure rod 31 on the bottom surface of the U-shaped groove 10 and press it against the outer sealing part 22. Then, insert the side pressure rod 32 into the side of the U-shaped groove 10 and align the guide post 34 at the bottom of the side pressure rod 32 with the corresponding inclined groove 33 at the bottom of the lower pressure rod 31. When the side pressure rod 32 is pressed down or inward, the guide post 34 slides along the inclined bottom surface of the inclined groove 33. Due to the guiding effect of the inclined groove 33, the lower pressure rod 31 is driven to move downward, thereby generating a greater vertical pressing force on the outer sealing part 22.

[0031] This embodiment employs a sliding connection between the guide post 34 and the inclined groove 33, which has the following advantages: First, it converts the horizontal or lateral movement of the side pressure rod 32 into the vertical movement of the lower pressure rod 31, achieving a locking action that simultaneously presses the side and bottom surfaces of the outer sealing part 22, thus improving installation efficiency; Second, the inclination angle of the inclined groove 33 can be set with different locking ratios. For example, the smaller the inclination angle, the greater the downward pressure can be generated by the same lateral force, making it easier to adjust the clamping force according to the hardness of the sealing body 2; Third, the cooperation between the guide post 34 and the inclined groove 33 can also play a limiting role, preventing the lower pressure rod 31 from moving laterally during use.

[0032] Multiple guide posts 34 and inclined grooves 33 can be spaced apart along the length of the pressure rod 31 to ensure uniform force distribution along the entire length. The surface of the guide post 34 can be coated with a lubricating coating or fitted with ball bearings to reduce sliding friction and facilitate on-site installation.

[0033] Specifically, the guide post 34 in this embodiment includes: The column 341 and the latching protrusion 342 formed on the end of the column 341; The end face of the latch 342 is provided with a deformation groove 343 that extends into the column 341, and the latch 342 stops on the outside of the pressure rod 31.

[0034] The deformation groove 343 extends axially along the guide post 34, dividing the end of the latching protrusion 342 and the post 341 into at least two forked arms. The width of the deformation groove 343 is preferably 0.5 mm to 2 mm, and its depth extends at least to the middle of the post 341 to ensure that the latching protrusion 342 has a certain radial shrinkage capacity.

[0035] During installation, when the side pressure rod 32 drives the guide post 34 into the inclined groove 33 of the lower pressure rod 31, the locking protrusion 342 first contacts the entrance edge of the inclined groove 33. Due to the presence of the deformation groove 343, the two forked arms of the locking protrusion 342 can elastically contract inward, temporarily reducing the outer diameter of the locking protrusion 342 and allowing it to pass smoothly through the narrow part of the inclined groove 33. When the locking protrusion 342 has completely passed through the inclined groove 33 and reached the outside of the lower pressure rod 31 (i.e., the side facing away from the inclined groove 33), the locking protrusion 342 opens outward under its own elastic restoring force, returning to its original size. At this time, the locking protrusion 342 stops on the outside of the lower pressure rod 31, that is, the end face of the locking protrusion 342 forms an axial abutment with the outer surface of the lower pressure rod 31, preventing the guide post 34 from accidentally coming out of the inclined groove 33.

[0036] The above-mentioned structure of the locking protrusion 342 with the deformable groove 343 has the following advantages: First, it realizes the one-way self-locking between the guide post 34 and the inclined groove 33, that is, the guide post 34 can be smoothly inserted, but will not be dislodged by itself without external force, thus improving the installation reliability of the fixing mechanism 3; Second, after the locking protrusion 342 stops on the outside of the lower pressure rod 31, it also plays an axial limiting role on the lower pressure rod 31 and the side pressure rod 32, preventing relative displacement of the two due to vibration during use; Third, when disassembly and maintenance are required, a tool can be used to squeeze the locking protrusion 342 from the side to make it retract, thereby pulling the guide post 34 out of the inclined groove 33, thus realizing repeated disassembly and assembly.

[0037] The end face of the protrusion 342 can be configured as an arc surface or a conical surface to facilitate contraction during insertion. The deformation groove 343 can be configured as a central slit or a cross-shaped slit, depending on the number of branches required for the protrusion 342. In this embodiment, the deformation groove 343 is preferably a through straight groove that divides the protrusion 342 into two elastic arms, which is simple in structure and easy to manufacture.

[0038] Preferably, in this embodiment of the invention, the bottom of the side pressure rod 32 is formed with a force-relief piece 35. This force-relief piece 35 is integrally formed with the side pressure rod 32 body or fixed by welding, bolting, or other methods. It is made of an elastic metal material, such as spring steel or stainless steel sheet, with a preferred thickness of 1 mm to 3 mm. The force-relief piece 35 has a Z-shaped structure. A Z-shaped structure means that the force-relief piece 35, when viewed from the side, presents two parallel horizontal segments and an inclined or vertical segment connecting the two, with an overall shape resembling the letter "Z". Specifically, the force-relief piece 35 includes a first horizontal arm, a second horizontal arm, and a middle vertical arm connecting the two. The first horizontal arm is fixedly connected to the bottom of the side pressure rod 32, and the second horizontal arm extends towards the downward pressure rod 31, being parallel to the first horizontal arm but offset by a height difference. The guide post 34 is fixed to the inner surface of the force-relief piece 35.

[0039] The installation process and working principle are as follows: When the side pressure rod 32 is pressed into the side of the U-shaped groove 10, the guide post 34 first enters the inclined groove 33 at the bottom of the lower pressure rod 31 and drives the lower pressure rod 31 to move downward to press the outer sealing part 22. As the side pressure rod 32 continues to be pressed inward, the lower pressure rod 31 has moved to its maximum stroke, that is, the outer sealing part 22 is compressed to the design limit compression. At this time, if the pressure is further applied to the side pressure rod 32, the Z-shaped structure of the force-breaking relief piece 35 will undergo elastic bending deformation, that is, the second cross arm will produce a slight displacement relative to the first cross arm, so that the body of the side pressure rod 32 can continue to move inward a small distance relative to the guide post 34, usually 0.5 mm to 2 mm. This small distance is the core innovation of this invention.

[0040] This short-distance movement design has multiple technical benefits: First, it absorbs installation tolerances. Due to manufacturing errors in the prefabricated dimensions of the groove body 1, or fluctuations in the actual thickness of the sealing body 2, the force-breaking relief plate 35 can compensate for excess compression while ensuring that the sealing body 2 obtains sufficient initial compression, thus avoiding damage to the sealing body 2 due to excessive compression.

[0041] Second, it buffers temperature stress. During use, the cable trench of the energy storage power station will expand and contract due to changes in ambient temperature, and the width of the joint between the two trench bodies 1 will change slightly. The force-relieving plate 35 can absorb this change through its own elastic deformation, so that the sealing body 2 is always within a stable compression range and will not cause the seal to fail due to stress accumulation.

[0042] Third, it provides overload protection. When the locking force applied by the construction personnel is too large, the Z-shaped structure of the force relief plate 35 will deform first, consuming the excess energy and preventing the pressure rod 31 or the side pressure rod 32 from causing irreversible indentations or cracks on the inner wall of the trench body 1.

[0043] Furthermore, the Z-shaped structure of the pressure relief plate 35 can be configured to be replaceable. That is, depending on the hardness of different sealing bodies 2 or different working conditions, pressure relief plates 35 of different thicknesses or material elasticities can be selected to adjust the small-distance movement range. For example, for a harder sealing body 2, a Z-shaped plate with greater elasticity can be selected to allow for a larger relief distance; for a softer sealing body 2, a Z-shaped plate with less elasticity can be selected to ensure sufficient clamping force.

[0044] During actual assembly, once the side pressure rod 32 is pressed into place, the operator can feel a significant change in resistance, i.e., the instant the force-relieving piece 35 begins to deform. At this point, the application of force can be stopped, indicating that the optimal clamping state has been reached. This force feedback characteristic greatly reduces the reliance on precision tools such as torque wrenches during on-site construction, thus improving construction efficiency.

[0045] In some embodiments, the intermediate sealing part 21 of the present invention has a plurality of ribs 23 formed on both sides, and the cross-section of the ribs 23 is an inverted triangular structure.

[0046] The rib 23 can be integrally molded from the same elastic material as the sealing body 2, such as EPDM rubber or silicone rubber. Furthermore, the so-called inverted triangular structure refers to the fact that the cross-section of the rib 23 is triangular, with the apex of the triangle facing outwards from the central sealing part 21, i.e., towards the end faces of the two groove bodies 1. The base of the triangle is located on the body of the central sealing part 21, and the two sides of the triangle gradually taper outwards from the base, forming sharp edges.

[0047] During installation, the intermediate sealing part 21 is clamped between the end faces of the two groove bodies 1, and the inverted triangular rib 23 directly contacts the end face of the groove body 1. Under the clamping force of the fixing mechanism 3, the intermediate sealing part 21 is axially compressed, and the sharp edges of the rib 23 preferentially undergo large deformation, tightly embedding into the micro-pits or processing textures of the end face of the groove body 1.

[0048] The inverted triangular cross-section ribs 23 have the following technical advantages: First, they form a multi-layered labyrinth seal. Multiple ribs 23 are arranged along the height of the central sealing section 21, effectively creating multiple independent sealing lines at the joint. Each rib 23 can prevent moisture penetration, and even if one or two outer ribs 23 fail due to damage or foreign matter, the inner ribs 23 can still maintain a seal. Second, they increase the interface sealing pressure. The sharp edges of the inverted triangular structure have a very small contact area under pressure, resulting in extremely high local pressure. This effectively fills the minor unevenness of the groove body 1's end face, achieving a gapless fit. Third, they reduce the requirements for end face flatness. Because the ribs 23 can adaptively embed into the unevenness of the end face, a good seal can be obtained without costly precision machining of the prefabricated groove body 1's end face. Fourth, when the sealing body 2 is subjected to alternating stress during use, the elastic deformation of the inverted triangular ribs 23 can dynamically adjust with changes in the end face gap, maintaining continuous contact pressure.

[0049] In an optional embodiment, the interior of the intermediate sealing part 21 and the outer sealing part 22 of the present invention are respectively provided with an air chamber 24 and an expansion chamber 25. The air chamber 24 and the expansion chamber 25 are connected, that is, they are connected by one or more connecting air passages to form a sealed gas channel. The lower pressure rod 31 and the two side pressure rods 32 all abut against the air chamber 24.

[0050] When the fixing mechanism 3 is installed and tightened, the lower pressure rod 31 and the side pressure rod 32 simultaneously compress the outer wall of the air chamber 24, increasing the gas pressure inside the air chamber 24. Since the air chamber 24 is connected to the expansion chamber 25, high-pressure gas enters the expansion chamber 25 through the connecting air passage, causing the expansion chamber 25 to expand outward. The expanded expansion chamber 25 further presses the outer sealing part 22 against the inner wall of the trench body 1, enhancing the contact pressure between the outer sealing part 22 and the inner wall. When the trench body 1 experiences a slight relative displacement due to temperature changes or foundation settlement, the external pressure on the air chamber 24 fluctuates, and the gas redistributes between the air chamber 24 and the expansion chamber 25, automatically adjusting the expansion degree of the expansion chamber 25 to ensure that the outer sealing part 22 always maintains a tight fit with the inner wall of the trench body 1.

[0051] The linkage structure of the air chamber 24 and the expansion chamber 25 is used to achieve air pressure-assisted sealing. The mechanical clamping force of the fixing mechanism 3 is converted into gas pressure through the air chamber 24, which then drives the expansion chamber 25 to expand. This is equivalent to converting mechanical energy into gas static pressure, making the sealing pressure distribution more uniform and avoiding excessive or insufficient local pressure.

[0052] Secondly, it features adaptive compensation for dynamic displacement. Due to the excellent fluidity and compressibility of gas, when the groove body 1 undergoes slight relative movement, the gas between the gas chamber 24 and the expansion chamber 25 can migrate rapidly, achieving almost instantaneous pressure rebalancing and thus maintaining a constant sealing contact pressure. This adaptive capability is difficult to achieve with purely solid elastic seals.

[0053] Furthermore, the installation accuracy requirements for the fixing mechanism 3 are reduced. Even if there is a slight deviation in the clamping position of the lower pressure rod 31 or the side pressure rod 32, the gas pressure in the air chamber 24 can still be transmitted to all parts of the expansion chamber 25 through the connecting air passage, achieving uniform clamping. Fourth, the air chamber 24 itself can also play a role in buffering and absorbing shock. When the cable trench is subjected to external impact or vibration, the compressed gas in the air chamber 24 can absorb some of the energy, reducing the dynamic load transmitted to the sealing interface.

[0054] In this embodiment, the air chamber 24 and the expansion chamber 25 can be filled with dry air, nitrogen, or an inert gas. The volume ratio of the air chamber 24 to the expansion chamber 25 is preferably 1:1 to 1:3 to ensure sufficient expansion stroke. The outer wall thickness of the sealing body 2, i.e., the thickness of the rubber layer between the air chamber 24 and the expansion chamber 25 and the outside, should be controlled between 0.5 mm and 1.5 mm to ensure sufficient elastic deformation capacity while preventing cracking due to excessively thin walls.

[0055] It should be noted that the connecting air passage between the air chamber 24 and the expansion chamber 25 can be located at the internal corner of the sealing body 2 to avoid opening the air passage in the area of ​​stress concentration. The air chamber 24 can be configured as a long strip cavity that runs through the entire length of the intermediate sealing part 21, or it can be configured as multiple segmented independent chambers, each chamber communicating with a corresponding segment of the expansion chamber 25, to prevent the air pressure sealing function of the entire sealing body 2 from completely failing due to a single point of damage.

[0056] Of course, to facilitate the installation of the entire mechanism, a mounting ear plate 36 is also provided on the end face of the side pressure rod 32 in this embodiment. The mounting ear plate 36 and the side pressure rod 32 can be integrally formed, or they can be fixed by welding or bolts. The mounting ear plate 36 is usually a rectangular or L-shaped plate structure, with its plate surface perpendicular to the length direction of the side pressure rod 32 and extending towards the internal opening of the cable trench. The mounting ear plate 36 is fixedly connected to the trench body 1 by fasteners. The fasteners can be standard connecting parts such as self-tapping screws, expansion bolts, pre-embedded bolts with nuts, or plastic expansion bolts. Threaded holes, pre-embedded nuts, or reserved mounting holes are pre-drilled on the trench body 1 at the positions corresponding to the through holes of the mounting ear plate 36. During installation, after placing the side pressure rod 32 into the side of the U-shaped groove 10 and adjusting it to the designed position, the fasteners are screwed into the corresponding holes of the trench body 1 through the through holes of the mounting ear plate 36 and tightened to firmly fix the side pressure rod 32 to the trench body 1.

[0057] Specifically, in this embodiment, one end of the groove body 1 is provided with an adapter groove 11, and the other end is formed with a mating protrusion 12, wherein the mating protrusion 12 and the adapter groove 11 are inserted and adapted.

[0058] When two grooved bodies 1 need to be mated, the mating protrusion 12 at the end of one grooved body 1 is aligned with the fitting groove 11 at the end of the other grooved body 1, and pushed axially until the mating protrusion 12 is fully inserted into the fitting groove 11. At this time, the end faces of the two grooved bodies 1 are close to each other, and the middle sealing part 21 is clamped between the two end faces. The insertion and engagement of the mating protrusion 12 and the fitting groove 11 serves a dual function of guiding and limiting.

[0059] The insertion structure of the adapter groove 11 and the mating protrusion 12 enables rapid positioning. During on-site construction, workers only need to insert the mating protrusion 12 into the adapter groove 11 to complete the axial and radial alignment of the two groove bodies 1, without repeated adjustments, which greatly improves assembly efficiency.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flexible sealing connection structure for prefabricated cable trenches in energy storage power stations, characterized in that, Includes at least two opposing trench bodies (1); A sealing body (2) is placed between the two groove bodies (1); The sealing body (2) includes an intermediate sealing part (21) and an outer sealing part (22), with the intermediate sealing part (21) between two groove bodies (1), and the outer sealing part (22) covering at least a portion of the inner wall of the two groove bodies (1); A fixing mechanism (3) is also installed inside the groove body (1). The two fixing mechanisms (3) are used to fix the two sides of the outer sealing part (22).

2. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 1, characterized in that: Both the intermediate sealing part (21) and the outer sealing part (22) are U-shaped structures. The outer sealing part (22) extends along the inner side of the intermediate sealing part (21) toward the direction in which the two groove bodies (1) are laid.

3. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 1, characterized in that: The fixing mechanism (3) includes: Downward pressure bar (31) and two side pressure bars (32); A U-shaped groove (10) is provided on the inner side of the groove body (1). The lower pressure rod (31) is placed on the bottom surface of the U-shaped groove (10), and the two side pressure rods (32) are respectively placed on the two sides of the U-shaped groove (10). The lower pressure rod (31) and the two side pressure rods (32) respectively abut against the outer side of the outer sealing part (22).

4. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 3, characterized in that: The bottom of the lower pressure rod (31) is provided with inclined grooves (33) on both sides, and the bottom of the side pressure rod (32) is provided with a guide post (34), which is slidably connected in the inclined groove (33).

5. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 4, characterized in that: The guide post (34) includes: The column (341) and the latch (342) formed on the end of the column (341); The end face of the latch (342) is provided with a deformation groove (343) that extends into the column (341), and the latch (342) stops on the outside of the pressure rod (31).

6. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 4, characterized in that: The bottom of the side pressure rod (32) is formed with a breaking force relief piece (35), which has a Z-shaped structure, and the guide post (34) is fixed on the inner side of the breaking force relief piece (35).

7. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 1, characterized in that: The intermediate sealing part (21) has several ribs (23) formed on both sides, and the cross-section of the ribs (23) is an inverted triangle structure.

8. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 3, characterized in that: The interior of the intermediate sealing part (21) and the outer sealing part (22) are respectively provided with an air chamber (24) and an expansion chamber (25). The air chamber (24) and the expansion chamber (25) are connected. The lower pressure rod (31) and the two side pressure rods (32) all abut against the air chamber (24).

9. The flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to claim 3, characterized in that: The end face of the side pressure rod (32) is also provided with a mounting ear plate (36), which is fixedly connected to the groove body (1) by fasteners.

10. A flexible sealing connection structure for prefabricated cable trenches in an energy storage power station according to any one of claims 1-9, characterized in that: One end of the groove body (1) is provided with an adapter groove (11), and the other end is formed with a mating protrusion (12). The mating protrusion (12) and the adapter groove (11) are inserted and adapted to each other.

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