Substation with anti-flooding function

Abstract

The application discloses a transformer substation with a waterlogging prevention function, and belongs to the technical field of transformer substation drainage. The transformer substation with the waterlogging prevention function comprises a transformer room, transformer equipment is arranged in the transformer room, a drainage groove is formed around the bottom surface of the transformer room, a grating plate is arranged at the upper end of the drainage groove, a cleaning assembly is arranged in the grating plate, the cleaning assembly comprises a driving mechanism, a connecting mechanism and a lifting mechanism, the driving mechanism is driven by water flow, the driving mechanism drives the lifting mechanism to move through the connecting mechanism, a drainage assembly is arranged at the corner of the drainage groove, the drainage assembly comprises a drainage mechanism, a blocking mechanism and a triggering mechanism, and the drainage mechanism drains water in the drainage groove. Through the arrangement of the drainage groove, the accumulated water can be collected in the first time, the arrangement of the cleaning assembly can effectively clean the grating plate, the grating plate is prevented from being blocked, and the arrangement of the drainage assembly can control drainage according to the water level.

Description

Technical Field

[0001] This invention belongs to the field of substation drainage technology, specifically relating to a substation with flood prevention function. Background Technology

[0002] A substation is a place in a power system that transforms voltage and current, receives electrical energy, and distributes electrical energy. Due to the early construction of some substations, their natural drainage capacity is limited. In recent years, the foundations of surrounding buildings and roads have been rising, and especially during the rainy season, water often enters the substation. When a large amount of water accumulates inside the substation, it can easily cause safety hazards. Therefore, it is necessary to drain the water inside the substation in a timely manner to ensure that the substation is dry and safe.

[0003] Substations typically have sewer grates installed above their drainage ditches. During heavy rains or floods, water carries leaves and debris from the road into the drainage ditches. However, leaves and debris tend to accumulate on the sewer grates, obstructing the flow of water into the ditches. When leaves accumulate excessively, they can even completely block the sewer grates. This is especially true during windy and rainy weather, when wind and rain can easily blow leaves off trees, making the situation even more likely. This significantly reduces the substation's drainage capacity.

[0004] During the drainage process, drainage ditches will drain accumulated water through drainage pipes. However, when there is no water accumulation and the weather is dry, drainage pipes can easily become entry and exit channels for small animals such as rats. Rats can easily gnaw on cables inside the substation, thus causing safety hazards.

[0005] Meanwhile, the natural drainage capacity of the drainage pipes is fixed and limited. When there is too much water, the drainage pipes are prone to not draining water in time, which can cause flooding inside the substation and lead to safety hazards. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a substation with flood prevention and blockage prevention functions.

[0007] The technical solution adopted to solve the above technical problems is: a substation with flood prevention function, including a substation room, in which power equipment is installed, and a drainage ditch is opened around the bottom of the substation room. A grating plate is installed at the upper end of the drainage ditch, and a cleaning component is installed inside the grating plate. The cleaning component includes a drive mechanism, a connecting mechanism and a lifting mechanism. The drive mechanism is driven by water flow, and the drive mechanism drives the lifting mechanism to move through the connecting mechanism.

[0008] A drainage assembly is provided at the corner inside the drainage trough. The drainage assembly includes a drainage mechanism, a blocking mechanism, and a triggering mechanism. The drainage mechanism drains water from the inside of the drainage trough, the blocking mechanism seals the drainage mechanism, and the triggering mechanism controls the operation of the drainage mechanism.

[0009] With the above technical solution, when water enters the substation, the water first flows through a drainage trough and is filtered by a grating plate installed inside the trough. The grating plate blocks leaves and debris carried by the water and keeps them on its outer surface. Then, the clean water flows into the drainage trough. Under the impact of the water flow, the drive mechanism drives the lifting mechanism to move up and down repeatedly through the connecting mechanism, thereby clearing the leaves and debris on the surface of the grating plate. This ensures the water intake efficiency of the grating plate and prevents water accumulation inside the substation due to blockage. At the same time, the drainage component can provide buoyancy according to the amount of water. When the water reaches a certain level and the float rises, the float drives the baffle to rise, thereby opening the drain pipe and allowing the water to flow out. When there is too much water, the rising float will trigger the trigger mechanism to start the water pump to assist in the drainage work, greatly improving the drainage efficiency.

[0010] Furthermore, the driving mechanism includes a rotating rod fixedly installed inside the drainage trough, with wheel blades evenly arranged around the outside of the rotating rod. The wheel blades withstand the impact of the water flow and drive the rotating rod to rotate. Cams are fixedly installed between the rotating rods.

[0011] Through the above technical solution, the flowing water impacts the impeller. Upon receiving the impact force of the water flow, the impeller rotates, causing the next impeller to also receive the impact force. This cycle repeats, causing the rotating rod to rotate, which in turn causes the cam to rotate as well.

[0012] Furthermore, each of the grid plates has slots inside, and the lifting mechanism includes a lifting plate located inside the slot. A top plate is uniformly provided on the outer upper surface of the lifting plate, and both the top plate and the lifting plate move up and down inside the slot.

[0013] With the above technical solution, a lifting plate and a top plate are placed inside the slots of the grating plate. This way, when the lifting plate and the top plate move up and down inside the slots, they will not easily detach from the slots. At the same time, the top plate is evenly distributed, so that during the lifting and lowering process, the top plate will push the leaves and debris accumulated on the surface of the grating plate to prevent them from blocking the slots of the grating plate.

[0014] Furthermore, the connecting mechanism includes a shaft fixedly installed inside the cam, a fixed shaft fixedly installed on the lower surface of the lifting plate, bushings installed on the outside of both the shaft and the fixed shaft, and a connecting rod fixedly connected between the bushings.

[0015] With the above technical solution, the cam and the lifting rod are connected by a connecting rod. In this way, when the cam rotates, it will drive the lifting plate to move. Because the lifting plate is set inside the slot and there is a fixed shaft on the outside of the lifting plate, it can be ensured that the lifting plate will remain vertical during the rising and falling process and will not get stuck inside the slot.

[0016] Furthermore, a pipe hole is provided at the lower end of the corner inside the substation. The drainage mechanism includes a drainage pipe installed inside the pipe hole. The drainage pipe runs through the inside and outside of the substation. A retaining ring is rotatably installed at one end of the drainage pipe inside the substation. The diameter of the retaining ring is larger than the diameter of the pipe hole. The diameter of the drainage pipe is equal to the diameter of the pipe hole. A water pump is fixedly connected to one end of the drainage pipe outside the substation.

[0017] With the above technical solution, the water accumulated inside the drainage trough will flow out of the substation through the drainage pipe inside the pipe hole. At the same time, the setting of the retaining ring can ensure that the drainage pipe will not be easily washed away from the inside of the pipe hole by the water flow. In addition, a water pump is installed outside the substation, so when the natural drainage speed of the drainage pipe is insufficient, the water pump can be started to assist in pumping water, thereby improving the drainage efficiency.

[0018] Furthermore, the blocking mechanism includes a fixed block fixedly installed inside the substation, a lifting rod installed inside the fixed block, a float fixedly connected to the lower end of the lifting rod, and a baffle fixedly connected to the surface of the float on the side near the drain pipe, the baffle being larger than the diameter of the drain pipe.

[0019] With the above technical solution, when there is water inside the drainage tank, the float is supported by buoyancy and will drive the lifting rod to rise, and at the same time the baffle will rise together, thus opening the drainage pipe to drain the water. When the water inside the drainage tank is drained, the float loses buoyancy and, under the action of gravity, the float drives the baffle to fall, thereby closing the drainage pipe.

[0020] Furthermore, the triggering mechanism includes a top block fixedly connected to the upper end of the lifting rod, a turntable is provided on the outside of the top block, and a trigger rod is fixedly provided on the surface of the turntable away from the top block, and the turntable drives the trigger rod to rotate.

[0021] With the above technical solution, when the float rises under the action of buoyancy, it will rise together with the top block and the turntable through the lifting rod. In this way, the trigger rod fixed on the outside of the turntable will also be driven to rise.

[0022] Furthermore, the triggering mechanism also includes a control switch fixedly installed inside the substation. The control switch controls the opening and closing of the water pump. The control switch has a button inside and limit rods fixedly installed on both sides of the upper part of the control switch.

[0023] With the above technical solution, when the trigger rod is lifted, it presses the button from bottom to top, which in turn activates the water pump to start pumping water. As the water inside the drainage trough is pumped out, the float moves the lifting rod back down due to decreased buoyancy and increased gravity. Simultaneously, the turntable falls, and the trigger rod fixed to the outside of the turntable is slightly blocked by the button. When the turntable is blocked by the trigger rod and buoyancy still exists, the turntable rotates under the influence of gravity, and the trigger rod is blocked by the limit rods on both sides until the trigger rod is rotated to the top, the buoyancy disappears completely, and the turntable continues to fall under the influence of gravity. At this point, the trigger rod presses the button from top to bottom, which shuts off the water pump.

[0024] Furthermore, when the lower end of the button is pressed, the water pump is turned off; when the upper end of the button is pressed, the water pump is turned on; and the trigger rod is located on the surface where the control switch is located.

[0025] Through the above technical solution, the trigger rod rises under the action of buoyancy to trigger the control switch, thereby activating the water pump for auxiliary pumping. When the buoyancy decreases and the gravity increases, the trigger rod is driven to slowly descend. Because buoyancy still exists, the turntable will be slightly obstructed and rotate during the descent of the lifting rod, top block, and turntable. As the turntable rotates, the trigger rod will be blocked by the limit rods on both sides, so the trigger rod will gradually be rotated to the top of the turntable. This effectively increases the descent stroke of the trigger rod, thereby increasing the working time of the water pump. When the lifting rod, top block, and turntable continue to descend, the trigger rod will also be driven to descend, thus shutting off the water pump unless the control switch is activated.

[0026] The beneficial effects of the present invention are as follows: (1) By setting drainage channels around the inside of the substation, the present invention ensures that water entering the substation will flow into the drainage channels, thereby ensuring the safety of the substation equipment. At the same time, the drainage channels are equipped with gratings to filter out debris such as leaves in the water, thus preventing the drainage channels from becoming clogged due to excessive debris. (2) The present invention also sets up a cleaning component inside the drainage channels. The drive mechanism inside the cleaning component uses the impact force of the water flow as power and drives the lifting mechanism to operate through the connecting mechanism. The lifting mechanism will then... The slots inside the grating plate move up and down continuously, which ensures the permeability of the slots inside the grating plate and prevents them from being blocked by debris such as leaves, thereby improving the flow of water; (3) At the same time, the present invention also provides a drainage component inside the drainage trough. The setting of the blocking mechanism can ensure that rats will not easily enter the substation during the dry season. The setting of the drainage mechanism can drain the water inside the drainage trough. The setting of the triggering mechanism can control the opening and closing of the water pump according to the water level, thereby assisting the drainage mechanism in drainage work and greatly improving drainage efficiency. Attached Figure Description

[0027] Figure 1 This is an external schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is an external rear view of the overall structure of the present invention;

[0029] Figure 3 This is a top view of the internal structure of the present invention;

[0030] Figure 4 This is a cross-sectional view of the internal structure of the present invention;

[0031] Figure 5 This is a first-angle schematic diagram of the structure of the grating plate, cleaning component and drainage component in this invention;

[0032] Figure 6 This is a second-angle schematic diagram of the structure of the grating plate, cleaning component and drainage component in this invention;

[0033] Figure 7 This is a first-angle exploded view of the drainage components and other structures in this invention;

[0034] Figure 8 This is a second-angle exploded view of the drainage components and other structures in this invention;

[0035] Figure 9 This is a first-angle schematic diagram of the cleaning components and other structures in this invention;

[0036] Figure 10 This is a second-angle schematic diagram of the cleaning components and other structures in this invention;

[0037] Figure 11 This is an exploded view of some of the cleaning components and other structures in this invention.

[0038] Reference numerals: 100, Substation; 101, Pipe hole; 102, Drainage trough; 200, Drainage pipe; 201, Retaining ring; 300, Water pump; 400, Grating plate; 500, Transformer equipment; 600, Lifting rod; 601, Float ball; 602, Top block; 603, Fixing block; 604, Turntable; 605, Limiting rod; 606, Control switch; 607, Button; 608, Baffle; 609, Trigger rod; 700, Rotating rod; 701, Wheel; 800, Top plate; 801, Fixed shaft; 802, Lifting plate; 900, Cam; 901, Connecting rod; 902, Bushing; 903, Shaft. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0040] like Figure 1 - Figure 11 As shown, this embodiment of a substation with flood prevention function includes a substation 100, inside which transformer equipment 500 is installed. Drainage channels 102 are formed around the bottom surface of the substation 100. When water enters the substation 100, it immediately enters the drainage channels 102 for collection, preventing damage to the transformer equipment 500. A grating plate 400 is installed at the upper end of the drainage channel 102. The grating plate 400 effectively blocks debris from the water. A cleaning component is installed inside the grating plate 400, which includes a drive mechanism, a connecting mechanism, and a lifting mechanism. The drive mechanism is driven by water flow, and the drive mechanism drives the lifting mechanism through the connecting mechanism. The lifting mechanism can push away debris on the upper surface of the grating plate 400, thus ensuring the water intake efficiency of the grating plate 400 and preventing water blockage due to debris accumulation.

[0041] A drainage assembly is installed at the corner inside the drainage trough 102. The drainage assembly includes a drainage mechanism, a blocking mechanism, and a triggering mechanism. The drainage mechanism drains water from the inside of the drainage trough 102. The blocking mechanism seals the drainage mechanism, thereby preventing rats from entering the substation 100 through the drainage pipe 200 during the dry season. The triggering mechanism controls the operation of the drainage mechanism and can control the opening and closing of the water pump 300, thereby ensuring drainage efficiency.

[0042] like Figure 9 - Figure 11 As shown, the driving mechanism includes a rotating rod 700 fixedly installed inside the drainage trough 102. Wheels 701 are evenly arranged around the outside of the rotating rod 700. The wheels 701 are arranged in a circle outside the rotating rod 700. The wheels 701 are subjected to the impact of water flow and drive the rotating rod 700 to rotate. Cams 900 are fixedly installed between the rotating rods 700.

[0043] The grating plate 400 has slots inside, so that water can enter the drainage trough 102 through the grating plate 400 more effectively. The lifting mechanism includes a lifting plate 802 located inside the slots. The upper surface of the lifting plate 802 is uniformly provided with a top plate 800. Both the top plate 800 and the lifting plate 802 move up and down inside the slots. Because the top plate 800 is uniformly provided outside the lifting plate 802, when the top plate 800 rises and falls inside the slots, it can better push up debris such as leaves, ensuring that large debris will not enter the drainage trough 102 due to excessive gaps.

[0044] The connecting mechanism includes a shaft 903 fixedly installed inside the cam 900, a fixed shaft 801 fixedly installed on the lower surface of the lifting plate 802, and bushings 902 installed on the outside of both the shaft 903 and the fixed shaft 801. A connecting rod 901 is fixedly connected between the bushings 902. The two ends of the connecting rod 901 can rotate around the fixed shaft 801 and the shaft 903 respectively, so as to ensure that the connecting rod 901 will not be disturbed when the cam 900 rotates.

[0045] like Figure 1 - Figure 8 As shown, a pipe hole 101 is provided at the lower end of the corner inside the substation 100. The drainage mechanism includes a drainage pipe 200 installed inside the pipe hole 101. The drainage pipe 200 runs through the inside and outside of the substation 100. A retaining ring 201 is rotatably installed at one end of the drainage pipe 200 inside the substation 100. The diameter of the retaining ring 201 is larger than the diameter of the pipe hole 101. Because of the presence of the retaining ring 201, the drainage pipe 200 is not easily washed away by the water flow. The diameter of the drainage pipe 200 is equal to that of the pipe hole 101. A water pump 300 is fixedly connected to one end of the drainage pipe 200 outside the substation 100. The water pump 300 can assist in pumping water from the drainage pipe 200, thereby improving the drainage efficiency.

[0046] like Figure 7 - Figure 8As shown, the blocking mechanism includes a fixed block 603 fixedly installed inside the substation 100. A lifting rod 600 is installed inside the fixed block 603, and the fixed block 603 guides the lifting rod 600. A float 601 is fixedly connected to the lower end of the lifting rod 600. The float 601 provides buoyancy for structures such as the baffle 608, the lifting rod 600, the top block 602, and the turntable 604. A baffle 608 is fixedly connected to the surface of the float 601 on the side near the drain pipe 200. The baffle 608 is larger than the diameter of the drain pipe 200 and seals the drain pipe 200.

[0047] The triggering mechanism includes a top block 602 fixedly connected to the upper part of the lifting rod 600. A turntable 604 is provided on the outside of the top block 602. A trigger rod 609 is fixedly provided on the surface of the turntable 604 on the side away from the top block 602. The turntable 604 drives the trigger rod 609 to rotate.

[0048] The triggering mechanism also includes a control switch 606 fixedly installed inside the substation 100. The control switch 606 is a push-button switch that controls the opening and closing of the water pump 300. A button 607 is installed inside the control switch 606. The button 607 is triangular in shape when viewed from the side. Limit rods 605 are fixedly installed on both sides of the upper part of the control switch 606. The limit rods 605 restrict the trigger rod 609.

[0049] like Figure 7 As shown, when the lower end of button 607 is pressed, it controls the water pump 300 to turn off; when the upper end of button 607 is pressed, it controls the water pump 300 to turn on. The trigger rod 609 is located on the surface where the control switch 606 is located.

[0050] The working principle of this embodiment is as follows: when water enters the substation 100, the water will first pass through the drainage trough 102 and be blocked by the grid plate 400. The leaves and other debris inside the water will be blocked by the grid plate 400, while the water without debris will flow into the drainage trough 102.

[0051] When water flows inside the drainage trough 102, the water flow impacts the wheel 701 fixedly installed on the outside of the rotating rod 700, causing the wheel 701 to drive the rotating rod 700 to rotate. When the rotating rod 700 rotates, it drives the cam 900 to rotate. One end of the connecting rod 901 set inside the cam 900 is also driven to rotate by the cam 900. The end of the connecting rod 901 away from the cam 900 will move up and down. The lifting plate 802 connected to the connecting rod 901 will also move up and down by the connecting rod 901. When the lifting plate 802 moves up and down in the slots opened inside the grid plate 400, it will also drive the top plate 800 to move up and down in the slots. During the lifting process, the top plate 800 will push up the leaves and other debris accumulated on the upper surface of the grid plate 400, so that the slots can smoothly pass through the water flow and will not accumulate water for a long time due to blockage of the slots.

[0052] After the water is filtered and flows into the drain trough 102, the water will accumulate and gradually increase because the drain pipe 200 is blocked by the baffle 608.

[0053] When the water inside the drainage trough 102 increases to the point that it can provide buoyancy for the float 601, the float 601 will float up due to buoyancy. When the float 601 floats in the water, it will drive the baffle 608 to float together. In this way, the baffle 608 will float up from the front end of the drain pipe 200 and leave. Under the action of gravity, the water will flow out of the substation 100 along the drain pipe 200.

[0054] When the water inside the drainage trough 102 continues to rise, the float ball 601 will continuously drive the baffle 608 to rise until the baffle 608 is completely away from the front end of the drainage pipe 200, at which point the natural drainage speed of the drainage pipe 200 reaches its maximum.

[0055] When the natural drainage speed of the drain pipe 200 reaches its maximum, and the water level inside the drain trough 102 continues to rise, the float 601 will continuously drive the lifting rod 600 and the top block 602 to rise. When the top block 602 rises, it will drive the trigger rod 609 to rise together through the turntable 604. During the rise, the trigger rod 609 will press the button 607, thereby pressing the button 607 from bottom to top, thereby starting the water pump 300 through the control switch 606. The water pump 300 will assist in pumping water inside the drain pipe 200, thereby improving the drainage efficiency of the drain pipe 200.

[0056] When the water inside the drainage trough 102 is drained and the water level drops, the float 601 will drive the top block 602 and the turntable 604 to descend via the lifting rod 600. At the same time, the trigger rod 609 will also be driven to descend. However, when the trigger rod 609 descends to the surface of the button 607, because the surface of the button 607 is inclined and the lower end is higher, the trigger rod 609 will be slightly obstructed. However, the turntable 604 continues to descend, so the turntable 604 will drive the trigger rod 609 to rotate. However, the trigger rod 609 will be blocked by the limit rods 605 on both sides. Therefore, the trigger rod 609 will remain between the limit rods 605, and the turntable 604 will continue to rotate until the trigger rod 609 is at the top of the turntable 604. At this time, the turntable 604 will continue to descend, which will drive the trigger rod 609 to descend and press the button 607 from top to bottom, thereby turning off the water pump 300.

[0057] Once the water inside the drainage trough 102 is drained, the float 601 and baffle 608 will descend continuously and seal the drainage pipe 200, thereby preventing rats from entering the substation 100 through the drainage pipe 200.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A substation with flood prevention function, comprising a substation (100), characterized in that: The substation (100) is equipped with power equipment (500). Drainage channels (102) are provided around the bottom of the substation (100). A grating plate (400) is provided at the upper end of the drainage channel (102). A cleaning component is provided inside the grating plate (400). The cleaning component includes a drive mechanism, a connecting mechanism and a lifting mechanism. The drive mechanism is driven by water flow. The drive mechanism drives the lifting mechanism to move through the connecting mechanism. A drainage assembly is provided at the corner inside the drainage trough (102). The drainage assembly includes a drainage mechanism, a blocking mechanism and a triggering mechanism. The drainage mechanism drains water from the inside of the drainage trough (102). The blocking mechanism seals the drainage mechanism. The triggering mechanism controls the operation of the drainage mechanism. The substation (100) has a pipe hole (101) at the lower end of the corner inside. The drainage mechanism includes a drainage pipe (200) installed inside the pipe hole (101). The drainage pipe (200) runs through the inside and outside of the substation (100). A retaining ring (201) is rotatably installed at one end of the drainage pipe (200) inside the substation (100). The diameter of the retaining ring (201) is larger than the diameter of the pipe hole (101). The diameter of the drainage pipe (200) is equal to the diameter of the pipe hole (101). A water pump (300) is fixedly connected to one end of the drainage pipe (200) outside the substation (100). The blocking mechanism includes a fixed block (603) fixedly installed inside the substation (100), a lifting rod (600) is installed inside the fixed block (603), a float (601) is fixedly connected to the lower end of the lifting rod (600), and a baffle (608) is fixedly connected to the surface of the float (601) on the side near the drain pipe (200). The baffle (608) is larger than the diameter of the drain pipe (200). The triggering mechanism includes a top block (602) fixedly connected to the upper part of the lifting rod (600), a turntable (604) is provided on the outside of the top block (602), and a trigger rod (609) is fixedly provided on the surface of the turntable (604) away from the top block (602). The turntable (604) drives the trigger rod (609) to rotate. The triggering mechanism also includes a control switch (606) fixedly installed inside the substation (100). The control switch (606) controls the opening and closing of the water pump (300). A button (607) is provided inside the control switch (606). Limit rods (605) are fixedly installed on both sides of the upper part of the control switch (606).

2. A substation with flood prevention function according to claim 1, characterized in that, The driving mechanism includes a rotating rod (700) fixedly installed inside the drainage trough (102). Wheels (701) are evenly arranged around the outside of the rotating rod (700). The wheels (701) withstand the impact of water flow and drive the rotating rod (700) to rotate. Cams (900) are fixedly arranged between the rotating rods (700).

3. A substation with flood prevention function according to claim 2, characterized in that, The grid plate (400) has slots inside. The lifting mechanism includes a lifting plate (802) located inside the slot. A top plate (800) is uniformly provided on the outer upper surface of the lifting plate (802). Both the top plate (800) and the lifting plate (802) move up and down inside the slot.

4. A substation with flood prevention function according to claim 3, characterized in that, The connecting mechanism includes a shaft (903) fixedly installed inside the cam (900), a fixed shaft (801) fixedly installed on the lower surface of the outer side of the lifting plate (802), and bushings (902) installed on the outer side of both the shaft (903) and the fixed shaft (801). A connecting rod (901) is fixedly connected between the bushings (902).

5. A substation with flood prevention function according to claim 1, characterized in that, When the lower end of the button (607) is pressed, the water pump (300) is turned off. When the upper end of the button (607) is pressed, the water pump (300) is turned on. The trigger rod (609) is located on the surface where the control switch (606) is located.

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