Grounding carbon brush device of wind driven generator and installation method of grounding carbon brush device

Abstract

The invention discloses a grounding carbon brush device of a wind driven generator and an installation method thereof.The grounding carbon brush device comprises a power generation box, a placement box is arranged on one side of the power generation box, a rotating shaft is arranged in the power generation box in a penetrating mode, a motor shell is arranged at the bottom of the placement box, and a heat dissipation piece is arranged in the motor shell; a mounting ring is arranged in the placement box, a connecting column is arranged on one side of the mounting ring, the other side of the connecting column is fixedly connected to the power generation box, the mounting ring is connected with a supporting block, and a mounting groove is formed in the supporting block in a penetrating mode. A good working environment can be provided for the supporting block and the carbon brush, extrusion force can be continuously generated on the carbon brush through parts such as a limiting column, a limiting plate, an extrusion plate, a spring, a connecting block and a first rack, and even if the carbon brush is abraded, tight attachment of the carbon brush and the rotating shaft can be kept.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection devices, in particular to a grounding carbon brush device of a wind generator and an installation method thereof. Background Art

[0002] As a system that converts wind kinetic energy into electrical energy, wind turbines have a higher hub height and blade diameter as their capacity increases. In this case, the possibility of wind turbines being struck by lightning also increases significantly.

[0003] In the lightning protection system, carbon brushes are used to introduce the static charge on the shaft into the ground to achieve the purpose of lightning protection. However, in actual application, carbon brushes often need to be replaced, and the replacement of grounding carbon brushes is particularly prominent. This is because the design of the fixing device of the grounding carbon brush is not reasonable, which makes the operation extremely inconvenient and inefficient during replacement. Moreover, the grounding carbon brush is on one side of the equipment, and the space at this location is relatively narrow. When manually replacing the grounding carbon brush, the tools used by the operator are very likely to fall into the equipment. Once the tool falls, it will not only bring additional trouble and obstacles to the replacement work, but also greatly affect the lightning protection effect of the equipment, bringing potential risks to the safe operation of the wind turbine.

[0004] Secondly, during the operation of the wind turbine, a lot of carbon powder will gradually accumulate on the shaft. The presence of this carbon powder will lead to poor contact between the shaft and the grounding carbon brush, which may cause overheating due to the friction between the two, and even sparks. At the same time, the accumulation of carbon powder on the shaft will also cause serious wear of the grounding carbon brush, resulting in the loss of its drainage effect, and it is impossible to effectively introduce the static charge on the shaft into the ground. In addition, the excessive wear of the grounding carbon brush caused by the accumulation of carbon powder will greatly reduce the service life of the grounding carbon brush, increase the maintenance cost and operation risk of the equipment, and affect the overall reliability and stability of the wind turbine. Summary of the invention

[0005] The purpose of the present invention is to provide a grounding carbon brush device for a wind turbine and an installation method thereof, which has the advantages of convenient removal of the carbon brush and stable operation, and solves the problem that the carbon brush moves due to the rotation of the shaft and the joint is prone to poor contact.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a grounding carbon brush device for a wind turbine, comprising a generator box, a placement box is provided on one side of the generator box, a rotating shaft is provided inside the generator box, a motor housing is provided at the bottom of the placement box, a heat sink is provided inside the motor housing, a mounting ring is provided inside the placement box, a connecting column is provided on one side of the mounting ring, the other side of the connecting column is fixedly connected to the generator box, the mounting ring is connected to a support block, and a mounting groove is provided inside the support block.

[0007] As a preferred grounding carbon brush device of a wind turbine of the present invention, a limiting member is arranged on one side of the mounting groove, the limiting member includes a shell, a limiting column is arranged inside the shell, the limiting column is slidably connected with a limiting plate and an extrusion plate, the limiting plate and the extrusion plate are fixedly connected by a fixing rod, and a spring is fixedly arranged between the limiting plate and the shell.

[0008] As a preferred embodiment of the grounding carbon brush device of a wind turbine of the present invention, a connecting block is provided on one side of the housing, and the connecting block is fixedly connected to the first rack.

[0009] As a preferred grounding carbon brush device of a wind turbine of the present invention, a sealing shell is provided at the bottom of the outer shell, and the sealing shell is respectively arranged at the bottom of both sides of the sealing shell along the axial direction of the rotating shaft, and the sealing shell is in contact with the rotating shaft, and a collecting groove is provided at the bottom of the sealing shell, and the collecting groove is along the radial direction of the rotating shaft.

[0010] As a preferred grounding carbon brush device of a wind turbine of the present invention, the first rack is meshedly connected with a driving gear, the driving gear is connected with a transmission belt, and the other end of the transmission belt is provided with a second gear.

[0011] As a preferred grounding carbon brush device of a wind turbine of the present invention, the second gear is meshingly connected with a second rack, one end of the second rack is provided with a connecting plate, and one end of the connecting plate is provided with a bonding plate.

[0012] As a preferred embodiment of a grounding carbon brush device for a wind turbine of the present invention, a sealing rubber member is provided inside the installation groove, the sealing rubber member is tightly fitted to the carbon brush, and a joint is provided at one end of the carbon brush.

[0013] As a preferred grounding carbon brush device of a wind turbine of the present invention, a collecting box is arranged inside the outer shell, an arc plate is arranged inside the collecting box, an air suction pump is arranged on one side of the collecting box, the air suction pump is connected to an air suction pipe, and one end of the air suction pipe is arranged inside the transfer box.

[0014] As a preferred grounding carbon brush device of a wind turbine of the present invention, a protrusion is provided on one side of the joint, the protrusion is provided inside the fixing block, and a clamping plate, a telescopic rod and a cylinder are provided on the top of the protrusion.

[0015] A method for installing a grounding carbon brush of a wind turbine comprises the following steps:

[0016] S1. Preparation before work: Lock the impeller lock and remove the coupling between the motor and the gearbox.

[0017] Power off to test the stator and rotor three-phase DC resistance, insulation to ground and turn-to-turn short circuit test;

[0018] S2. Install the grounding ring: Install the grounding ring at the generator drive end;

[0019] S3. Install the brush holder: Install the grounding carbon brush and connector. After the grounding wire is installed, it must not come into contact with the rotating shaft, and the grounding device must not interfere with the coupling shield.

[0020] S4. Install the grounding carbon brush feedback signal line. After putting the carbon brush micro switch signal feedback line on the hose, tie the hose and the drive end bearing PT100 line hose together with a cable tie, then use scissors to cut a small hole in the hose at the bottom of the stator junction box, pass the micro switch signal line through the hole, and connect it to the rotor junction box. Wrap and seal the cut small hole with electrical tape, connect the signal line in series with the signal line in the generator collector ring room, and then connect it to the circuit.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention can provide good stability through the installation ring, which can provide a good working environment for the support block and the carbon brush. The limit column, limit plate, extrusion plate, spring, connecting block, first rack and other parts can continuously generate extrusion force on the carbon brush, and even if the carbon brush is worn, the carbon brush and the rotating shaft can be kept in close fit.

[0023] 2. The present invention can fit both sides of the carbon brush while completing the extrusion of the carbon brush through the cooperation of the first rack, the driving gear and the transmission belt, thereby effectively preventing the carbon brush from being affected by the rotating shaft and being ineffective.

[0024] 3. The present invention can absorb the carbon residue generated by the friction of the carbon brush in time through the collection box, arc plate, suction pump, suction pipe, transfer box and other devices, so as to prevent poor contact between the rotating shaft and the grounding carbon brush, which may cause overheating due to the friction between the two, and even cause sparks. At the same time, the accumulation of carbon powder on the rotating shaft will also cause serious wear of the grounding carbon brush, resulting in the loss of its drainage effect, and the inability to effectively introduce the static charge on the rotating shaft into the earth. In addition, the excessive wear of the grounding carbon brush caused by the accumulation of carbon powder will also greatly reduce the service life of the grounding carbon brush, increase the maintenance cost and operation risk of the equipment, and affect the overall reliability and stability of the wind turbine generator set, so the absorption of carbon powder is of great significance.

[0025] 4. The present invention can effectively make the joint contact with the protrusion by setting the protrusion, the clamping plate, the telescopic rod, the cylinder, etc., so as to prevent poor contact, prevent the electric charge on the shaft from being unable to be conducted to the earth, prevent the equipment from being struck by lightning in thunderstorm weather, and avoid damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An overall schematic diagram of the device provided by the present invention;

[0027] Figure 2 A partial enlarged view provided by the present invention;

[0028] Figure 3 An internal cross-sectional view of a support block provided by the present invention;

[0029] Figure 4 The present invention provides Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 A cross-sectional view of a fixing block provided by the present invention;

[0031] In the figure: 1. power generation box; 101. placement box; 2. rotating shaft; 3. heat sink; 4. mounting ring; 401. connecting column; 5. supporting block; 501. mounting groove; 502. limiting member; 5021. housing; 5022. limiting column; 2023. limiting plate; 5024. extrusion plate; 5025. spring; 5026. connecting block; 5027. first rack; 5028. sealing shell; 5029. collecting tank; 6. driving gear; 601. transmission belt; 602. second gear; 7. second rack; 701. connecting plate; 702. bonding plate; 8. sealing rubber ring; 9. carbon brush; 901. joint; 10. collecting box; 1001. arc plate; 1002. suction pump; 1003. suction pipe; 1004. transfer box; 13. fixing block. DETAILED DESCRIPTION

[0032] Example 1

[0033] See also Figure 1-Figure 5 A device for installing a carbon brush comprises a power generation box 1, a placement box 101 is arranged on one side of the power generation box 1, a rotating shaft 2 is arranged inside the power generation box 1, a motor housing is arranged at the bottom of the placement box 101, a heat sink 3 is arranged inside the motor housing, a mounting ring 4 is arranged inside the placement box 101, a connecting column 401 is arranged on one side of the mounting ring 4, the other side of the connecting column 401 is fixedly connected to the power generation box 1, the mounting ring 4 is connected to a support block 5, a mounting groove 501 is opened inside the support block 5, a limiting member 502 is arranged on one side of the mounting groove 501, the limiting member 502 comprises a shell 5021, a limiting column 5022 is arranged inside the shell 5021, the limiting column 5022 is slidably connected to a limiting plate 5023 and an extrusion plate 5024, the limiting plate 5023 and the extrusion plate 5024 are fixedly connected by a fixing rod, and the limiting plate 502 A spring 5025 is fixedly arranged between the housing 5021 and the housing 5021, a connecting block 5026 is arranged on one side of the housing 5021, and the connecting block 5026 is fixedly connected to the first rack 5027, a sealing shell 5028 is arranged at the bottom of the housing 5021, and the sealing shells 5028 are respectively arranged at the bottoms of both sides of the sealing shell 5028 along the axial direction of the rotating shaft 2, and the sealing shell 5028 is fitted with the rotating shaft 2, a collecting groove 5029 is arranged at the bottom of the sealing shell 5028, and the collecting groove 5029 is along the radial direction of the rotating shaft 2, the first rack 5027 is meshedly connected with the driving gear 6, the driving gear 6 is connected with the transmission belt 601, the other end of the transmission belt 601 is arranged with the second gear 602, the second gear 602 is meshedly connected with the second rack 7, one end of the second rack 7 is arranged with a connecting plate 701, and one end of the connecting plate 701 is arranged with a fitting plate 702. A sealing rubber member 8 is disposed inside the mounting groove 501 . The sealing rubber member 8 is tightly fitted to the carbon brush 9 . A joint 901 is disposed at one end of the carbon brush 9 .

[0034] Specifically, the present invention can provide good stability through the installation ring 4, and can provide a good working environment for the support block 5 and the carbon brush 9. The limit column 5022, the limit plate 5023, the extrusion plate 5024, the spring 5025, the connection block 5026, the first rack 2027 and other parts can continuously generate an extrusion force on the carbon brush 9, and even if the carbon brush 9 is worn, the carbon brush 9 and the shaft 2 can be kept in close contact. The present invention can complete the extrusion of the carbon brush 9 and fit the two sides of the carbon brush 9 through the cooperation of the first rack 5027, the driving gear 6 and the transmission belt 601, so as to effectively prevent the carbon brush 9 from being affected by the shaft 2 and being cheap and ineffective.

[0035] Furthermore, the carbon brush 9 is first inserted into the installation groove 501. When the carbon brush 9 starts to pass through the sealing rubber ring 8, since the sealing rubber ring 8 is tightly fitted with the surface of the carbon brush 9, it is in a sealed state at this time, so the air will be squeezed by the carbon brush 9. Due to the setting of the sealing shell 5028, the carbon powder can only flow out through the collecting groove 5029, thereby effectively preventing the poor contact between the rotating shaft and the grounding carbon brush, which may cause overheating due to the friction between the two, and even cause sparks. At the same time, the accumulation of carbon powder on the rotating shaft will also cause serious wear of the grounding carbon brush, resulting in the loss of its drainage effect, and the inability to effectively introduce the static charge on the rotating shaft into the earth. In addition, the excessive wear of the grounding carbon brush caused by the accumulation of carbon powder will greatly reduce the service life of the grounding carbon brush, increase the maintenance cost and operation risk of the equipment, and affect the overall reliability and stability of the wind turbine generator set. When the carbon brush 9 is in contact with the rotating shaft 2, the operation of the drive gear 6 is driven by the motor, thereby driving the gear 6 to drive The first rack 5027 moves, so that the connecting block 5026 and the housing 5021 move synchronously. Since the extrusion plate 5024 loses its limit, the spring 5025 begins to release its elastic force, thereby driving the limit plate 2023 and the extrusion plate 5024 to move along the limit column 5022, so that the extrusion plate 5024 fits the top of the carbon brush 9. When the carbon brush 9 is worn, it can continue to be pressed down, so that the extrusion plate 5024 always fits the top of the carbon brush 9, and the bottom of the carbon brush 9 always fits the surface of the shaft 2, and the second gear 602 rotates synchronously under the action of the transmission belt 601, thereby driving the movement of the second rack 7, the connecting plate 701 and the fitting plate 702, so that the fitting plate 702 always fits the two ends of the carbon brush 9, preventing the grounding carbon brush 9 from tilting to the right when the shaft 2 rotates, resulting in a reduction in the contact area between the bottom of the grounding carbon brush 9 and the surface of the shaft 2, avoiding affecting the conductive effect between the shaft 2 and the grounding carbon brush 9, and preventing the lightning protection effect of the equipment from being reduced.

[0036] Example 2

[0037] See also Figure 1-Figure 5 A joint fixing device, a collecting box 10 is arranged inside the outer shell 5021, an arc plate 1001 is arranged inside the collecting box 10, an air suction pump 1002 is arranged on one side of the collecting box 10, the air suction pump 1002 is connected to the air suction pipe 1003, one end of the air suction pipe 1003 is arranged inside the transfer box (1004), a protrusion 11 is arranged on one side of the joint 901, the protrusion 11 is arranged inside the fixing block 13, and a pressing plate 12, a telescopic rod 121 and a cylinder 122 are arranged on the top of the protrusion 11.

[0038] Furthermore, when the carbon powder enters the collecting tank 5029, the suction pump 1002 is started to suck the carbon powder into the collecting box 10 through the suction pipe 1003, and the arc plate 1001 is set to prevent the carbon powder from flowing back, and the excess air can be discharged through the outlet.

[0039] The present invention can absorb the carbon residue generated by the friction of the carbon brush 9 in time by means of the collecting box 10, the arc plate 1001, the suction pump 1002, the suction pipe 1003, the transfer box 1004 and other devices, so as to prevent poor contact between the rotating shaft 2 and the grounding carbon brush 9, which may cause overheating due to the friction between the two, and even cause sparks. At the same time, the accumulation of carbon powder on the rotating shaft 2 will also cause serious wear of the grounding carbon brush 9, resulting in the loss of its drainage effect, and the inability to effectively introduce the static charge on the rotating shaft 2 into the earth. In addition, the excessive wear of the grounding carbon brush 9 caused by the accumulation of carbon powder will also greatly reduce the service life of the grounding carbon brush 9, increase the maintenance cost and operation risk of the equipment, and affect the overall reliability and stability of the wind turbine generator set.

[0040] The present invention can effectively make the joint 901 contact with the protrusion 11 through the arrangement of the protrusion 11, the clamping plate 12, the telescopic rod 121, the cylinder 122, etc., thereby preventing poor contact, preventing the electric charge on the rotating shaft 2 from being unable to be conducted to the ground, preventing the equipment from being struck by lightning in thunderstorm weather, and avoiding damage to the equipment.

[0041] Example 3

[0042] As a third embodiment of the present invention, this embodiment provides a method for installing a grounding carbon brush of a wind turbine, comprising the following steps:

[0043] S1. Preparation before work: lock the impeller lock, remove the coupling between the motor and the gearbox, power off to test the three-phase direct resistance of the stator and rotor, test the insulation to ground and the inter-turn short circuit test; first insert the carbon brush 9 into the installation groove 501. When the carbon brush 9 starts to pass through the sealing rubber ring 8, since the sealing rubber ring 8 and the surface of the carbon brush 9 are tightly fitted, it is in a sealed state at this time, so the air will be squeezed by the carbon brush 9. Due to the setting of the sealing shell 5028, the carbon powder can only flow out through the collection groove 5029, thereby effectively preventing the poor contact between the shaft and the grounding carbon brush, which may cause overheating due to the friction between the two, and even sparks. At the same time, the accumulation of carbon powder on the shaft will also cause the grounding carbon brush to wear seriously, resulting in the loss of its drainage effect, and it is impossible to effectively introduce the static charge on the shaft into the ground. In addition, the excessive wear of the grounding carbon brush caused by the accumulation of carbon powder will greatly reduce the service life of the grounding carbon brush, increase the maintenance cost and operation risk of the equipment, and affect the overall reliability and stability of the wind turbine generator set.

[0044] S2. Install the grounding ring: Install the grounding ring at the driving end of the generator, and connect the mounting ring 4 and the connecting column 401 to one side of the generator box 1.

[0045] S3. Install the brush holder: install the grounding carbon brush and the connector. After the grounding wire is installed, it must not contact the rotating shaft, and the grounding device must not interfere with the coupling shield. When the carbon brush 9 is in contact with the rotating shaft 2, the motor drives the driving gear 6 to operate, so that the driving gear 6 drives the first rack 5027 to move, so that the connecting block 5026 and the housing 5021 move synchronously. Since the extrusion plate 5024 loses its limit, the spring 5025 begins to release its elastic force, thereby driving the limit plate 2023 and the extrusion plate 5024 to move along the limit column 5022, so that the extrusion plate 5024 is in contact with the top of the carbon brush 9. When the carbon brush 9 is worn, it can continue to be pressed down so that the extrusion plate 5024 is always in contact with the top of the carbon brush 9, and the bottom of the carbon brush 9 is always in contact with the surface of the shaft 2, and the second gear 602 rotates synchronously under the action of the transmission belt 601, thereby driving the movement of the second rack 7, the connecting plate 701 and the bonding plate 702, so that the bonding plate 702 is always in contact with the two ends of the carbon brush 9, preventing the grounding carbon brush 9 from tilting to the right when the shaft 2 rotates, resulting in a reduction in the contact area between the bottom of the grounding carbon brush 9 and the surface of the shaft 2, avoiding affecting the conductive effect between the shaft 2 and the grounding carbon brush 9, and preventing the lightning protection effect of the equipment from being reduced.

[0046] When the carbon powder enters the collecting tank 5029, the suction pump 1002 is started to suck the carbon powder into the collecting box 10 through the suction pipe 1003. The arc plate 1001 is set to prevent the carbon powder from flowing back, and the excess air can be discharged through the outlet.

[0047] S4. Install the grounding carbon brush feedback signal line. After putting the carbon brush micro switch signal feedback line on the hose, tie the hose and the drive end bearing PT100 line hose together with a cable tie, then use scissors to cut a small hole in the hose at the bottom of the stator junction box, pass the micro switch signal line through the hole, and connect it to the rotor junction box. Wrap and seal the cut small hole with electrical tape, connect the signal line in series with the signal line in the generator collector ring room, and then connect it to the circuit.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A grounding carbon brush device for a wind turbine generator, comprising a generator box (1), characterized in that: A placement box (101) is provided on one side of the power generation box (1), a rotating shaft (2) is provided through the inside of the power generation box (1), a motor housing is provided at the bottom of the placement box (101), a heat sink (3) is provided inside the motor housing, a mounting ring (4) is provided inside the placement box (101), a connecting column (401) is provided on one side of the mounting ring (4), the other side of the connecting column (401) is fixedly connected to the power generation box (1), the mounting ring (4) is connected to a support block (5), and a mounting groove (501) is provided through the inside of the support block (5).

2. A grounding carbon brush device for a wind turbine according to claim 1, characterized in that: A limiting member (502) is arranged on one side of the installation groove (501), and the limiting member (502) comprises a shell (5021), and a limiting column (5022) is arranged inside the shell (5021), and the limiting column (5022) is slidably connected to a limiting plate (5023) and an extrusion plate (5024), and the limiting plate (5023) and the extrusion plate (5024) are fixedly connected via a fixing rod, and a spring (5025) is fixedly arranged between the limiting plate (5023) and the shell (5021).

3. A grounding carbon brush device for a wind turbine according to claim 2, characterized in that: A connecting block (5026) is provided on one side of the housing (5021), and the connecting block (5026) is fixedly connected to a first rack (5027).

4. A grounding carbon brush device for a wind turbine according to claim 3, characterized in that: A sealing shell (5028) is provided at the bottom of the outer shell (5021); the sealing shell (5028) is respectively provided at the bottom of both sides of the sealing shell (5028) along the axial direction of the rotating shaft (2); the sealing shell (5028) is in close contact with the rotating shaft (2); a collecting groove (5029) is provided at the bottom of the sealing shell (5028); the collecting groove (5029) is along the radial direction of the rotating shaft (2).

5. A grounding carbon brush device for a wind turbine according to claim 4, characterized in that: The first rack (5027) is meshedly connected with a driving gear (6), the driving gear (6) is connected with a transmission belt (601), and the other end of the transmission belt (601) is provided with a second gear (602).

6. A grounding carbon brush device for a wind turbine according to claim 5, characterized in that: The second gear (602) is meshedly connected with a second rack (7), one end of the second rack (7) is provided with a connecting plate (701), and one end of the connecting plate (701) is provided with a fitting plate (702).

7. A grounding carbon brush device for a wind turbine according to claim 6, characterized in that: A sealing rubber part (8) is arranged inside the installation groove (501), and the sealing rubber part (8) is tightly fitted to the carbon brush (9), and a joint (901) is arranged at one end of the carbon brush (9).

8. A grounding carbon brush device for a wind turbine according to claim 7, characterized in that: A collection box (10) is arranged inside the outer shell (5021), an arc-shaped plate (1001) is arranged inside the collection box (10), an air suction pump (1002) is arranged on one side of the collection box (10), the air suction pump (1002) is connected to an air suction pipe (1003), and one end of the air suction pipe (1003) is arranged inside the transfer box (1004).

9. A grounding carbon brush device for a wind turbine according to claim 8, characterized in that: A protruding piece (11) is provided on one side of the joint (901), and the protruding piece (11) is arranged inside the fixing block (13). A pressing plate (12), a telescopic rod (121) and a cylinder (122) are provided on the top of the protruding piece (11).

10. A method for installing a grounding carbon brush of a wind turbine, applicable to the grounding carbon brush device of a wind turbine as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Preparation before work: Lock the impeller lock and remove the coupling between the motor and the gearbox. Power off to test the stator and rotor three-phase DC resistance, insulation to ground and turn-to-turn short circuit test; S2. Install the grounding ring: Install the grounding ring at the generator drive end; S3. Install the brush holder: Install the grounding carbon brush and connector. After the grounding wire is installed, it must not come into contact with the rotating shaft, and the grounding device must not interfere with the coupling shield. S4. Install the grounding carbon brush feedback signal line. After putting the carbon brush micro switch signal feedback line on the hose, tie the hose and the drive end bearing PT100 line hose together with a cable tie, then use scissors to cut a small hole in the hose at the bottom of the stator junction box, pass the micro switch signal line through the hole, and connect it to the rotor junction box. Wrap and seal the cut small hole with electrical tape, connect the signal line in series with the signal line in the generator collector ring room, and then connect it to the circuit.

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