Power cable trench for apartment building equipped with intake and exhaust fans

CN123018693APending Publication Date: 2026-10-30YIXIN ELECTRICAL SUPERVISION CO LTD
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Patent Information

Application Number
CN202510654016.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-04-28
Filing Date
2025-05-21
Publication Date
2026-10-30

AI Technical Summary

Benefits of technology

根据本发明的实施例涉及配备有进排气扇的公寓大楼用电源电缆沟,其能够从根本上防止水进入沟槽主体内,即使水进入沟槽主体内,也会与安装在左右电缆盘上下部的电源电缆分开排水,存在水浸、触电、漏电的隐患,并且排气扇操作架和进气扇操作架的升降口由于沟槽主体内进水而自动上升,通过排气扇操作架的排气电机的排气扇自动将充满水的内部空气排出到外部,同时通过进气扇操作架的进气电机的进气扇吸入外部干燥的空气,使沟槽主体内的水通过顺畅的通风自然蒸发,从而无需大功率来运行电热丝等加热装置,提前预防由此引起的触电、漏电等安全事故,并且能够在不消耗过多电力的情况下将沟槽内的水蒸发而消失。

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Abstract

The present invention relates to a power cable trench for an apartment building equipped with an intake and exhaust fan, and the exhaust fan operating frame and the intake fan operating frame are automatically raised due to water entering the trench body, the water-filled internal air is automatically exhausted to the outside through the exhaust fan of the exhaust fan operating frame of the exhaust fan motor, while the dry air outside is sucked in through the intake fan of the intake fan operating frame of the intake fan motor, the water in the trench body is naturally evaporated through smooth ventilation, so that the high-power heating device such as electric heating wire is not needed to operate, the safety accidents such as electric shock and leakage caused by this are prevented in advance, and the water in the trench can be evaporated and disappeared without consuming too much power.
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Description

Technical Field

[0001] This invention relates to a power cable trench for apartment buildings equipped with exhaust fans, and more specifically, to a power cable trench for apartment buildings equipped with exhaust fans that can fundamentally prevent water from entering the trench body. Even if water does enter the trench body, it will drain separately from the power cables installed on the upper and lower parts of the left and right cable reels. Therefore, there is no risk of water immersion, electric shock, or leakage. Furthermore, the lifting ports of the exhaust fan control frame and the intake fan control frame automatically rise due to water entering the trench body. The exhaust fan of the exhaust motor of the exhaust fan control frame automatically discharges the water-filled internal air to the outside, while the intake fan of the intake motor of the intake fan control frame draws in dry external air. This allows the water in the trench body to evaporate naturally through smooth ventilation, thus eliminating the need to operate heating devices such as heating wires at high power. This prevents safety accidents such as electric shock and leakage caused by this, and the water in the trench can be evaporated and eliminated without consuming excessive electricity. Background Technology

[0002] Typically, power cable trenches are installed on the floor of the apartment building's electrical distribution room to serve as a cable laying facility.

[0003] If water enters the electrical distribution room, there is a high possibility of electrical leakage. Even if the door to the electrical distribution room is well sealed and water cannot flow in, water can still potentially get in.

[0004] Cable trenches are formed on the bottom surface of such distribution rooms for laying wires. The materials used for the cable trenches must be rust-free or rust-proof, and their size, strength, and material must be suitable for the intended use.

[0005] Such trench covers should be painted the same color as the building's finish, and any irregularities should be avoided during installation.

[0006] The trench cover must be equipped with a handling handle, and its construction should ensure that it does not protrude when not in use.

[0007] Cable trenches need to be installed in the electrical distribution room of apartment buildings to prevent water from flowing into the trenches where the wires are laid. Even if water does enter the trench, the cable trench and the location of the wires need to be drained separately. Summary of the Invention

[0008] This invention addresses the aforementioned problems by providing a power cable trench for apartment buildings equipped with an intake and exhaust fan. The trench comprises: a trench body having a horizontal bottom surface, a main body bottom surface, left and right drainage slopes, left and right side surfaces, and left and right inclined support plates at the lower end; left and right cable reels having left and right vertical support plates, left and right lower horizontal plates, left and right lower end perforated plates, left and right lower part perforated plates, left and right middle part perforated plates, and left and right upper part perforated plates; a trench cover having left and right slots on the bottom surface, a fan support circular plate, a fan through hole, a magnetic sensor, an exhaust fan hole, and an intake fan hole; an exhaust fan operating frame having a lifting port, a lifting rod, an upper magnet, a lower magnet, an exhaust motor, an exhaust fan, an exhaust hole, and an exhaust fan frame; and an intake fan operating frame having a lifting port, a lifting rod, an upper magnet, a lower magnet, and an intake motor. The system includes an intake fan and air intake vents, which fundamentally prevent water from entering the trench body. Even if water does enter the trench body, it will drain separately from the power cables installed on the upper and lower parts of the left and right cable reels. Therefore, there is no risk of water immersion, electric shock, or leakage. Furthermore, the lifting ports of the exhaust fan control frame and the intake fan control frame automatically rise due to water entering the trench body. The exhaust fan motor of the exhaust fan control frame automatically discharges the water-filled internal air to the outside, while the intake fan motor of the intake fan control frame draws in dry external air. This allows the water in the trench body to evaporate naturally through smooth ventilation, eliminating the need for high-power operation of heating devices such as heating wires. This proactively prevents safety accidents such as electric shock and leakage caused by water immersion, and the water in the trench can be evaporated and eliminated without consuming excessive electricity.

[0009] Invention Effects According to embodiments of the present invention, a power cable trench for apartment buildings equipped with intake and exhaust fans is provided. This trench can fundamentally prevent water from entering the trench body. Even if water does enter the trench body, it will drain separately from the power cables installed on the upper and lower parts of the left and right cable reels, thus preventing water immersion, electric shock, and leakage hazards. Furthermore, the lifting ports of the exhaust fan control frame and the intake fan control frame automatically rise due to water entering the trench body. The exhaust fan of the exhaust motor of the exhaust fan control frame automatically discharges the water-filled internal air to the outside, while the intake fan of the intake motor of the intake fan control frame draws in dry external air. This allows the water in the trench body to evaporate naturally through smooth ventilation, thus eliminating the need to operate heating devices such as heating wires at high power. This prevents electric shock, leakage, and other safety accidents caused by this, and the water in the trench can be evaporated and eliminated without consuming excessive electricity. Attached Figure Description

[0010] Figure 1 This is an exploded perspective view showing the secure state of a power cable trench for an apartment building equipped with an intake and exhaust fan, according to an embodiment of the present invention.

[0011] Figure 2This is a perspective view showing the connection status of a power cable trench for an apartment building equipped with an intake and exhaust fan, according to an embodiment of the present invention.

[0012] Figure 3 This is a plan view showing the construction status of a power cable trench for an apartment building equipped with an intake and exhaust fan, according to an embodiment of the present invention.

[0013] Figure 4 This is an enlarged cross-sectional view of the main parts of the exhaust fan control frame and intake fan control frame of an apartment building power cable trench equipped with exhaust fans, according to an embodiment of the present invention.

[0014] Figure 5 This is a front cross-sectional view showing the operating state of the exhaust control frame when water flows into the power cable trench of an apartment building equipped with an exhaust fan, according to an embodiment of the present invention.

[0015] Figure 6 This is a front cross-sectional view of the exhaust control frame in its maximum operating state when water flows into the power cable trench of an apartment building equipped with an exhaust fan, according to an embodiment of the present invention.

[0016] Figure 7 This is a front cross-sectional view of the operating state of the air intake control frame in an apartment building equipped with an air intake and exhaust fan when water flows into the power cable trench.

[0017] Figure 8 This is a front cross-sectional view of the air intake operating frame in its maximum operating state when water flows into the power cable trench of an apartment building equipped with an air intake and exhaust fan, according to an embodiment of the present invention.

[0018] Figure 9 This is a front cross-sectional view of the maximum operating state of the exhaust control frame and the air intake control frame when water flows into the power cable trench of an apartment building equipped with an exhaust fan, according to an embodiment of the present invention.

[0019] In the picture: 10: Main body of the trench; 11: Bottom surface of the main body; 11a: Horizontal bottom surface; 11b, 11c: Left and right drainage slopes; 12, 13: Left and right sides; 12a, 13a: Outer horizontal plates; 12b, 13b: Outer vertical protrusions; 12c, 13c: Left and right gaskets; 20, 30: Left and right cable reels; 21, 31: Vertical support plates; 22, 32: Lower left and right horizontal plates; 23, 33: Lower left and right perforated plates; 23a, 33a: Through holes; 24, 34: Lower left and right perforated plates; 40: Trench cover; 41, 41a: Left and right bottom insertion slots; 42: In the exhaust fan hole; 42a: Sealing ring groove; 42b: Sealing ring; 42c: Fan support round plate; 42d: Fan through hole; 42e: Support rod. 42f: Lower extension protrusion, 43: Air intake fan hole, 43a: Sealing ring groove, 43b: Sealing ring, 43c: Fan support circular plate, 43d: Fan through hole, 43e: Support rod, 50: Exhaust fan operating bracket, 60: Bottom surface. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known function or structure would obscure the essence of the invention, such detailed description will be omitted. The present invention relates to a power cable trench for an apartment building equipped with an intake and exhaust fan, comprising: a trench body 10, embedded in a bottom surface 60; left and right cable reels 20 and 30, installed on the left and right sides inside the trench body 10, for fixing and supporting power cables 27 and 37 respectively; a trench cover 40 for sealing the top of the trench body 10; an exhaust fan operating frame 50, installed on the trench cover 40, and raised by a lifting member 51 when water enters the interior to exhaust humid internal air to the outside; and an intake fan operating frame 50a, installed on the trench cover 40, and raised by a lifting member 51 when water enters the interior to introduce dry external air into the interior.

[0021] This invention can fundamentally prevent water from flowing into the interior of the trench body 10. Even if water does flow into the interior of the trench body 10, it will be discharged through the cables 27 and 37 installed on the upper and lower parts of the left and right cable reels 20 and 30 respectively. Therefore, there are no problems such as water immersion, electric shock, or leakage. In addition, as water flows into the trench body 10, the lifting components 51 of the exhaust fan operating frame 50 and the intake fan operating frame 50a automatically rise. The exhaust fan 53b of the exhaust motor 51a of the exhaust fan operating frame 50 automatically discharges the water-filled interior air to the outside. At the same time, the intake fan 54b of the intake motor 54a of the intake fan operating frame 50a draws dry outside air into the trench body 10. Through smooth ventilation, the water in the trench body 10 evaporates naturally. This not only eliminates the need for high power to drive heating devices such as heating wires, but also prevents safety accidents such as electric shock and leakage in advance. Furthermore, it can make the water inside the trench evaporate and disappear without consuming too much electricity.

[0022] The trench body 10 is rectangular when viewed from the front and extends a predetermined length longitudinally. It has a bottom surface 11 with an opening 11d at the top, fixedly embedded in a bottom surface 60. Left and right side surfaces 12 and 13 are formed, vertically extending upwards from the left and right ends of the bottom surface 11. A horizontal bottom surface 11a is formed at the center of the bottom surface 11. Left and right drainage slopes 11b and 11c are formed at the left and right ends of the horizontal bottom surface 11a, extending obliquely towards the left and right side surfaces 12 and 13. Multiple lower left and right inclined support plates 15 and 16 are formed at equal intervals along the length direction, symmetrically arranged relative to the horizontal bottom surface 11a, each having a vertical support plate on the left and right drainage slopes 11b and 11c. Directly above 1c, it is a right-angled triangle when viewed from the front, with a predetermined thickness. The upper surface is a horizontal upper surface 15a and 16a, and the inner surface is a vertical inner surface 15b and 16b. It has upper outer horizontal plates 12a and 13a that bend outward from the upper ends of the left and right sides 12 and 13 of the main body and extend horizontally for a predetermined length. It has inner vertical protrusions 12aa and 13aa that protrude vertically upward from the inner end for a predetermined length. It has outer vertical protrusions 12b and 13b that extend vertically upward from the outer ends of the upper outer horizontal plates 12a and 13a for a predetermined length, with their upper surfaces and bottom surfaces 60 on the same straight line. It has left and right gaskets 12C and 13C installed on the upper outer horizontal plates 12a and 13a.

[0023] The left and right cable reels 20 and 30 are vertically erected plates, each having left and right vertical support plates 21 and 31 that are tightly attached to the left and right sides 12 and 13 of the main body of the trench body 10; each having left and right lower horizontal plates 22 and 32 that are vertically bent at the lower ends of the left and right vertical support plates 21 and 31 and are installed on the upper horizontal surfaces 15a and 16a of the lower left and right inclined support plates 15 and 16; each having multiple through holes 23a and 33a that extend horizontally inward from the inner side of the lower end of the left and right vertical support plates 21 and 31, and having perforated plates 23 and 33 at the lower end of the plates for installing power cables 27 and 37; and each having perforated plates 23 and 33 at the lower inner side of the left and right vertical support plates 21 and 31 and at the lower end of the plates. 33 extends horizontally inward at a predetermined interval, and has multiple through holes 24a and 34a, respectively, for mounting power cables 27 and 37 on the lower left and right perforated plates; 33 has multiple through holes 25a and 35a, respectively, extending horizontally inward at a predetermined interval from the lower left and right perforated plates 24 and 34, for mounting power cables 27 and 37 on the middle inner side of the left and right vertical support plates 21 and 31, respectively, for mounting power cables 27 and 37 on the middle left and right perforated plates 25 and 35; 33 has multiple through holes 26a and 36a, respectively, extending horizontally inward at a predetermined interval from the upper inner side of the left and right vertical support plates 21 and 31, respectively, for mounting power cables 27 and 37 on the upper left and right upper perforated plates 26 and 36 on the middle left and right perforated plates 27 and 37, respectively.

[0024] The trench cover plate 40 is a horizontal plate of predetermined thickness, installed on the inner side of the outer vertical protrusions 12b and 13b on the left and right sides 12 and 13 of the trench body 10. Its upper surface is horizontal with the upper surface of the outer vertical protrusions 12b and 13b, and it closes the opening 11d. The bottom surface has left and right bottom insertion slots 41 and 41a on the left and right sides for the inner vertical protrusions 12aa and 13aa to be inserted. The center has a plurality of exhaust fan holes 42 with a diameter greater than the left and right width at predetermined intervals. The upper inner side of the exhaust fan hole 42 has an outwardly recessed sealing ring groove 42a for installing the sealing ring 42b. The lower center of the exhaust fan hole 42 has a fan support circular plate 4 with a fan through hole 42d. 2c is fixedly supported by multiple support rods 42e, forming a magnetic sensor 42f fixedly installed on the bottom surface of the fan support circular plate 42c. A downwardly extending protrusion 42g is formed at the bottom of the exhaust fan hole 42, protruding directly downward by a predetermined length. An intake fan hole 43 is formed through the exhaust fan hole 42 and another adjacent exhaust fan hole 42, but has the same structure as the exhaust fan hole 42. However, it is the same as the sealing ring groove 42a, sealing ring 42b, fan support circular plate 42c, fan through hole 42d, support rod 42e and downward extending protrusion 42f, respectively forming a sealing ring groove 43a, sealing ring 43b, fan support circular plate 43c, fan through hole 43d, support rod 43e and downward extending protrusion 43f.

[0025] The exhaust fan operating frame 50 has a horizontal bottom surface 11a that is installed directly below the exhaust fan hole 42 of the groove body 10, and has the same height as the upper horizontal surface 15a, 16a of the lower left and right inclined support plates 15, 16, and is a square plate. A lifting body 51 is formed on the inner side of the center of the lifting body 51a located directly below the fan through holes 42d, 43d of the fan support circular plates 42c, 43c, and is integrally connected with the anchor nut 51b. It has a lower threaded part 52c, which serves as a vertical rod and is inserted directly below the fan through hole 42d of the groove support circular plate 42c. The lower threaded part is screwed into the anchor nut 51b. The upper magnet 52a and the lower magnet 52b located below the magnetic sensor 42f are arranged at a certain interval. A lifting rod 52 is formed, which is raised and lowered by the lifting member 51. The lifting rod 52 is installed in the exhaust fan hole 42. When water flows into the interior of the trench body 10, the upper end of the lifting rod 52, which is a cylindrical body extending upward from the exhaust fan hole 42 through the lifting member 51 and the lifting rod 52, is fixedly connected to the center of the bottom surface. Multiple exhaust holes 53c are opened at predetermined intervals on the outer circumference. The upper end protrudes outward and is installed in the sealing ring groove 42a. An exhaust motor 53a is formed inside, which is connected to the external power supply 53d and the magnetic sensor 42f. When the upper magnet 52a is detected, the exhaust fan 53b rotates at a predetermined speed, thereby expelling the air inside the trench body 10 through the exhaust holes 53c to the outside. An exhaust fan frame 53 is also formed, which further increases the rotation speed of the exhaust fan 53b when the lower magnet 52b is detected by the magnetic sensor 42f.

[0026] The intake fan operating frame 50a is an air intake device installed in the intake fan hole 43 of the trench body 10. It is formed in the same way as the lifting member 51 and lifting rod 52 of the exhaust fan operating frame 50. It is installed in the intake fan hole 43. When water flows into the trench body 10, the cylinder protruding upward from the intake fan hole 43 through the lifting member 51 and lifting rod 52 is fixedly connected to the upper end of the lifting rod 52 at the center of the bottom surface. Multiple air intake holes 54c are formed on its outer periphery at predetermined intervals. The upper end protrudes outward and is installed in the sealing ring groove 42a. It is formed inside and connected to the external power supply 54d and magnetic sensor 42f, so that when the upper magnet 52a is detected, the intake fan 54b is rotated at a constant speed. The intake motor 54a draws external air into the trench body 10 through the multiple air intake holes 54c. An intake fan frame 54 is formed to further accelerate the speed of the intake fan 54b when the lower magnet 52b is detected by the magnetic sensor 42f.

Claims

1. A power cable trench for apartment buildings equipped with intake and exhaust fans, characterized in that, include: The main body of the trench (10) is rectangular when viewed from the front and extends a predetermined length longitudinally. It has a bottom surface (11) with an opening (11d) at the top and fixedly embedded in the bottom surface (60). It has left and right side surfaces (12, 13) that are vertically erected from the left and right ends of the bottom surface (11). It has a horizontal bottom surface (11a) that is horizontal in the center of the bottom surface (11). It has left and right drainage slopes (11b, 11c) that are inclined at the left and right ends of the horizontal bottom surface (11a) and extend obliquely toward the left and right side surfaces (12, 13). It has multiple lower left and right inclined support plates (15, 16) that are symmetrically formed at equal intervals along the length direction with respect to the horizontal bottom surface (11a). Each of these plates has a vertical support plate that is erected on the left and right drainage slopes (11b, 11c). 11c) Directly above, it is a right triangle when viewed from the front, with a predetermined thickness, the upper surface is a horizontal upper surface (15a, 16a), the inner surface is a vertical inner surface (15b, 16b), and an upper outer horizontal plate (12a, 13a) is formed, which bends outward from the upper end of the left and right sides of the main body (12, 13) and extends horizontally for a predetermined length. An inner vertical protrusion (12aa, 13aa) is formed, which protrudes vertically upward from the inner end for a predetermined length. An outer vertical protrusion (12b, 13b) is formed, which extends vertically upward from the outer end of the upper outer horizontal plate (12a, 13a) for a predetermined length, and its upper surface and bottom surface (60) are on the same straight line. Left and right gaskets (12C, 13C) are formed on the upper surface of the upper outer horizontal plate (12a, 13a). The left and right cable reels (20, 30) are vertically erected plates, each having a left and right vertical support plate (21, 31) that is tightly attached to the left and right sides (12, 13) of the main body of the groove body (10); each having a left and right lower horizontal plate (22, 32) that is vertically bent at the lower end of the left and right vertical support plates (21, 31) and horizontally installed on the upper horizontal surface (15a, 16a) of the lower left and right inclined support plates (15, 16); each having a perforated plate (23, 33) at the lower end of the plate, extending horizontally inward from the inner side of the lower end of the left and right vertical support plates (21, 31) and having multiple through holes (23a, 33a), for installing power cables (27, 37); each having a perforated plate (23, 33) at the lower end of the plate, extending horizontally inward from the inner side of the lower end of the left and right vertical support plates (21, 31) and the perforated plate (23, 33a) at ... 3) Extending horizontally inward at predetermined intervals, each plate has multiple through holes (24a, 34a) and is equipped with power cable (27, 37) plates on the lower left and right sides respectively. On the inner side of the middle portion of the left and right vertical support plates (21, 31), extending horizontally inward at predetermined intervals with the lower left and right perforated plates (24, 34), each plate has multiple through holes (25a, 35a) and is equipped with power cable (27, 37) plates on the middle left and right sides respectively. On the inner side of the upper portion of the left and right vertical support plates (21, 31), extending horizontally inward at predetermined intervals with the middle left and right perforated plates (25, 35), each plate has multiple through holes (26a, 36a) and is equipped with power cable (27, 37) plates on the upper left and right sides respectively. The trench cover plate (40) is a horizontal plate of predetermined thickness. It is installed on the inner side of the outer vertical protrusions (12b, 13b) on the left and right sides (12, 13) of the trench body (10). Its upper surface is horizontal with the upper surface of the outer vertical protrusions (12b, 13b) and closes the opening (11d). The bottom surface has left and right bottom insertion grooves (41, 41a) on the left and right sides for the inner vertical protrusions (12aa, 13aa) to be inserted. The center has multiple exhaust fan holes (42) with a diameter greater than the left and right width at predetermined intervals. The upper inner side of the exhaust fan hole (42) has a sealing ring groove (42a) that is recessed outward to install the sealing ring (42b). The lower center of the exhaust fan hole (42) has a fan support circular plate (42c) with a fan through hole (42d) supported by multiple fans. A rod (42e) is fixedly supported, and a magnetic sensor (42f) is fixedly installed on the bottom surface of the fan support circular plate (42c). A downwardly extending protrusion (42g) with a predetermined length is formed at the bottom of the exhaust fan hole (42). An intake fan hole (43) is formed through the exhaust fan hole (42) and another adjacent exhaust fan hole (42), but has the same structure as the exhaust fan hole (42). However, it is the same as the sealing ring groove (42a), sealing ring (42b), fan support circular plate (42c), fan through hole (42d), support rod (42e) and downward extending protrusion (42f), and respectively forms a sealing ring groove (43a), sealing ring (43b), fan support circular plate (43c), fan through hole (43d), support rod (43e) and downward extending protrusion (43f). The exhaust fan operating frame (50) has a horizontal bottom surface (11a) that is installed directly below the exhaust fan hole (42) of the groove body (10), and has the same height as the upper horizontal surface (15a, 16a) of the lower left and right inclined support plates (15, 16), and has a square plate lifting body (51a). The lifting body (51a) is located directly below the fan through hole (42d, 43d) of the fan support circular plate (42c, 43c). A lifting member 51 is formed on the inner side of the center of 1a), and is integrally connected with the anchor nut (51b). It has a lower threaded part (52c). The lower threaded part serves as a vertical rod and is inserted directly below through the fan through hole (42d) of the grooved support plate (42c). The lower threaded part is screwed into the anchor nut (51b). The upper magnet (52a) and the lower magnet (52b) located below the magnetic sensor (42f) are arranged at a certain interval and respectively form a lifting member 52c. The lifting rod (52) is raised and lowered by the lifting member (51). The lifting rod (52) is installed in the exhaust fan hole (42). When water flows into the trench body (10), the upper end of the lifting rod (52), which is a cylindrical body extending upward from the exhaust fan hole (42) by the lifting member (51) and the lifting rod (52), is fixedly connected to the center of the bottom surface. Multiple exhaust holes (53c) are opened at predetermined intervals on the outer circumference. The upper end protrudes outward and is installed in the sealing ring groove (42a). An exhaust motor (53a) is formed inside, which is connected to an external power supply (53d) and a magnetic sensor (42f). When the upper magnet (52a) is detected, the exhaust fan (53b) rotates at a predetermined speed, thereby expelling the air inside the trench body (10) through the exhaust holes (53c) to the outside. An exhaust fan frame (53) is formed, which further increases the rotation speed of the exhaust fan (53b) when the lower magnet (52b) is detected by the magnetic sensor (42f). An intake fan operating frame (50a) is an intake device installed in the intake fan hole (43) of the trench body (10). It is formed in the same way as the lifting member (51) and lifting rod (52) of the exhaust fan operating frame (50). It is installed in the intake fan hole (43). When water flows into the trench body (10), the cylinder protruding upward from the intake fan hole (43) through the lifting member (51) and lifting rod (52) is fixedly connected to the upper end of the lifting rod (52) at the center of the bottom surface. Multiple intakes are formed at predetermined intervals on its outer periphery. The hole (54c) extends outward from the upper end and is installed in the sealing ring groove (42a). Inside, there is an intake motor (54a) that is connected to an external power supply (54d) and a magnetic sensor (42f). When the upper magnet (52a) is detected, the intake fan (54b) is rotated at a constant speed, and external air is drawn into the groove body (10) through multiple intake holes (54c). An intake fan frame (54) is formed that further accelerates the rotation speed of the intake fan (54b) when the lower magnet (52b) is detected by the magnetic sensor (42f).