Air conditioning unit detection system with interlocking function

Abstract

The utility model relates to the technical field of air conditioning units, in particular to an air conditioning unit detection system with an interlocking function, which comprises a main body, an opening and closing door is slidably connected in the main body, a fixed shell is additionally arranged on one side of the main body, and a synchronous plate is fixed on one side of the opening and closing door and corresponds to the fixed shell. A travel switch is installed at the end, close to the synchronous plate, of the fixing shell, and a positioning mechanism used for fixing the travel switch and a limiting mechanism used for positioning the synchronous plate are installed on the fixing shell. According to the air conditioning unit detection system with the interlocking function, through cooperation of the synchronous plate, the fixing shell, the travel switch, the positioning mechanism and the limiting mechanism, when the air conditioning unit detection system with the interlocking function is used, the travel switch is extruded by the opening and closing door through opening of the opening and closing door; the switch door is always in an open state by positioning the synchronous plate through the limiting mechanism, and at the moment, other operators are informed that the fan chamber is shut down for maintenance through a signal transmitted by the limiting mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioner units, in particular to an air conditioner unit detection system with an interlock function. Background Technique

[0002] An air conditioner unit is an air handling device assembled by various air handling functional sections. The air handling functional sections of the unit include air mixing, filtering, cooling, primary and secondary heating, dehumidifying, humidifying, supply fan, return fan, water pump and other unit bodies.

[0003] It is found that the following technical problems exist in the prior art: when the on-site fan is shut down for maintenance and repair indoors, the outdoor operator may directly start the fan without knowing it, which is likely to cause safety problems. Therefore, an air conditioner unit detection system with an interlock function is designed to provide another technical solution to the above technical problems. Content of the Utility Model

[0004] Based on this, the utility model provides an air conditioner unit detection system with an interlock function, which is used to solve the technical problem that when the on-site fan is shut down for maintenance and repair indoors, the outdoor operator directly starts the fan without knowing it, thus posing a safety hazard.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An air conditioner unit detection system with an interlock function includes a main body. A switch door is slidably connected inside the main body. A fixed shell is additionally installed on one side of the main body. A synchronous plate is fixed at a position corresponding to the fixed shell on one side of the switch door. A travel switch is installed at one end of the fixed shell close to the synchronous plate. A positioning mechanism for fixing the travel switch and a limiting mechanism for positioning the synchronous plate are installed on the fixed shell. After the switch door is opened, the synchronous plate presses the travel switch, so as to notify external personnel that maintenance is in progress through the operation of the travel switch.

[0007] Preferably, the positioning mechanism includes an assembly frame, a pressing plate, a lifting plate, a height adjustment driving motor and an adjustment gear. An assembly frame is fixed outside the bottom end of the travel switch at one end of the fixed shell close to the synchronous plate. The travel switch is slidably connected with the assembly frame. A pressing plate is slidably connected above the travel switch inside the fixed shell. A lifting plate is fixed at the bottom of the pressing plate. A height adjustment driving motor is fixed inside the fixed shell. The output end of the height adjustment driving motor is connected with an adjustment gear, and the adjustment gear is meshed with the lifting plate. The height adjustment driving motor drives the pressing plate to lift, so as to fix the travel switch located inside the assembly frame by pressing through the downward movement of the pressing plate.

[0008] Preferably, anti-slip pads are fixed on the inner side of the assembly frame and the bottom of the pressing plate.

[0009] Preferably, the model of the travel switch is YBLXW-5-11D1.

[0010] Preferably, the limit mechanism includes a positioning plate, a rotating sleeve, a compression spring, a lifting drive rotary motor, and a lifting threaded rod. A positioning plate is connected inside the fixed shell. An extrusion inclined surface is provided at one end of the positioning plate close to the synchronizing plate. A rotating sleeve is slidably connected inside the other end of the positioning plate away from the synchronizing plate. A compression spring is sleeved outside the rotating sleeve and at the bottom of the positioning plate. The top of the compression spring is fixed to the positioning plate, and the top of the positioning plate is fixed to the rotating sleeve. A lifting drive rotary motor is fixed inside the bottom end of the fixed shell. The output end of the lifting drive rotary motor is connected with a lifting threaded rod, and the outside of the lifting threaded rod is threadedly connected with the rotating sleeve.

[0011] Preferably, the air conditioner unit detection system further includes a control cabinet. A display screen is fixed on one side of the control cabinet, and the display screen is used to display whether there is someone or no one in the maintenance room.

[0012] Preferably, a controller is further arranged inside the control cabinet. The controller is electrically connected to the travel switch and the display screen through wires respectively. When the travel switch is squeezed, the travel switch gives a signal to the controller, and the controller controls the display screen to display whether there is someone or no one.

[0013] Preferably, the model of the controller is SC200.

[0014] Preferably, a control circuit for receiving the signal of the travel switch is installed inside the control cabinet. The control circuit includes an inverter. One end of the top of the inverter is connected to the travel switch SQ through a wire, and the travel switch SQ is a normally closed contact. Two sides of the bottom end of the inverter are respectively connected with a first wire and a second wire. One end of the first wire is connected to a fuse FU through a wire. One end of the fuse FU is connected in parallel with a stop button SB1 through a wire. The bottom of the stop button SB1 is connected in series with a start button SB2. The stop button SB1 is a normally closed contact, and the start button SB2 is a normally open contact. One end of the start button SB2 is connected in parallel with an inverter start relay KA1 through a wire. The bottom of the start button SB2 is connected in series with a maintenance lighting start relay KA2. The bottom of the maintenance lighting start relay KA2 is connected to the second wire. The top of one end of the second wire is connected in parallel with a maintenance lighting lamp EL.

[0015] Preferably, a stop lamp HR is connected in parallel between the first wire and the second wire and at one end of the stop button SB1, an operating lamp HG is connected in parallel between the first wire and the second wire and at one end of the stop lamp HR, a fault lamp PF is connected in parallel between the first wire and the second wire and at one end of the operating lamp HG, a normally open point of the frequency converter alarm is connected in series at the top of the fault lamp PF, a power supply lamp PW is connected in parallel between the first wire and the second wire and at one end of the fault lamp PF, and a maintenance lighting start button SB3 is connected in parallel between the first wire and the second wire and at one end of the power supply lamp PW.

[0016] Through the above technical solutions, the present utility model has at least the following beneficial effects:

[0017] A detection system for an air-conditioning unit with an interlocking function provided by the present utility model, through the cooperation of a synchronization board, a fixed shell, a travel switch, a positioning mechanism and a limiting mechanism, can, when in use, with the opening of the switch door, while the switch door squeezes the travel switch, through the positioning of the synchronization board by the limiting mechanism, keep the switch door in an open state all the time. At this time, the signal transmitted by the limiting mechanism notifies other operators that the fan room is under shutdown maintenance and inspection;

[0018] Through the cooperation of an assembly frame, a pressing plate and a lifting plate, the travel switch can be placed inside the assembly frame, and the travel switch inside the assembly frame can be fixed by the lowering of the lifting plate driving the lowering of the pressing plate;

[0019] Through the cooperation of a positioning plate, a rotating sleeve, a compression spring and a lifting threaded rod, the movement of the synchronization board squeezes the positioning plate through the inclined plane, enabling the positioning plate to descend and rebound by resetting through the compression of the compression spring. Furthermore, the synchronization board can be fixed by the positioning plate to prevent the switch door from rebounding inside the main body and causing signal errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments of the present utility model are as follows

[0021] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0022] Figure 2 is a rear view of the present utility model;

[0023] Figure 3 is a schematic diagram of the structure of the control cabinet of the present utility model;

[0024] Figure 4 is a schematic diagram of the internal structure of the fixed shell of the present utility model;

[0025] Figure 5 is a schematic diagram of the structure of the positioning mechanism of the present utility model;

[0026] Figure 6 This is a schematic structural diagram of the limiting mechanism of the present utility model;

[0027] Figure 7 This is the circuit diagram of the present utility model;

[0028] Figure 8 This is the motor control circuit diagram of the present utility model;

[0029] Figure 9 This is the start control circuit diagram of the present utility model.

[0030] In the figure: 1, main body; 2, switch door; 3, synchronization plate; 4, fixed shell; 5, travel switch; 6, control cabinet; 7, display screen; 8, assembly rack; 9, pressing plate; 10, lifting plate; 11, height adjustment driving motor; 12, adjusting gear; 13, positioning plate; 14, extrusion inclined plane; 15, rotating sleeve; 16, compression spring; 17, lifting driving rotating motor; 18, lifting threaded rod. Specific embodiments

[0031] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following combines the accompanying drawings and embodiments to clearly and completely describe the technical solutions in the embodiments of the present utility model.

[0032] Note: Similar reference numerals and letters represent similar items in the following drawings. Therefore, if it is defined in one drawing, it does not need to be re-defined and explained in subsequent drawings.

[0033] Embodiment 1

[0034] Refer to Figures 1 - 2 , an air conditioner unit detection system with an interlock function, including a main body 1, a switch door 2 is slidably connected inside the main body 1, a fixed shell 4 is fixed on one side of the main body 1, and a synchronization plate 3 is fixed at a position corresponding to the fixed shell 4 on one side of the switch door 2, so that when the switch door 2 is opened inside the main body 1, the synchronization plate 3 moves in the direction close to the fixed shell 4. A travel switch 5 is installed at one end of the fixed shell 4 close to the synchronization plate 3. The model of the travel switch 5 is YBLXW-5-11D1, so that after the switch door 2 is opened, the travel switch 5 receives a signal through the extrusion of the synchronization plate 3.

[0035] Refer to Figure 4, a positioning mechanism for fixing the travel switch 5 is installed on the fixed housing 4. The positioning mechanism includes an assembly frame 8, a pressure plate 9, a lifting plate 10, a height adjustment drive motor 11, and an adjustment gear 12. An assembly frame 8 is fixed at one end of the fixed housing 4 close to the synchronizing plate 3 and outside the bottom end of the travel switch 5. The travel switch 5 is slidably connected to the assembly frame 8. Inside the fixed housing 4, a pressure plate 9 is connected above the travel switch 5. Thus, the travel switch 5 located inside the assembly frame 8 is fixed by extrusion through the downward movement of the pressure plate 9. Anti-slip pads are fixed on both the inner side of the assembly frame 8 and the bottom of the pressure plate 9, so that the travel switch 5 can be fixed more firmly inside the assembly frame 8;

[0036] Refer to Figure 5 , a lifting plate 10 is fixed inside the fixed housing 4 and at the bottom of the pressure plate 9, so that the lifting of the lifting plate 10 drives the lifting of the pressure plate 9. A height adjustment drive motor 11 is fixed inside the fixed housing 4. The output end of the height adjustment drive motor 11 is connected with an adjustment gear 12, and the adjustment gear 12 is meshed with the lifting plate 10. Thus, the rotation of the adjustment gear 12 drives the lifting plate 10 to lift and lower.

[0037] Refer to Figure 4 and Figure 6 , a limiting mechanism for positioning the synchronizing plate 3 is installed on the fixed housing 4. The limiting mechanism includes a positioning plate 13, a rotating sleeve 15, a compression spring 16, a lifting drive rotary motor 17, and a lifting threaded rod 18. A positioning plate 13 is slidably connected inside the fixed housing 4. An extrusion inclined surface 14 is provided at one end of the positioning plate 13 close to the synchronizing plate 3. When the synchronizing plate 3 approaches the travel switch 5, the positioning plate 13 is driven to descend by the extrusion of the extrusion inclined surface 14. At the same time, the position of the synchronizing plate 3 is fixed by the rebound of the extrusion inclined surface 14. A rotating sleeve 15 is slidably connected inside the end of the positioning plate 13 far from the synchronizing plate 3, so that the rotating sleeve 15 can only lift and lower inside the positioning plate 13 and cannot rotate. Specifically, the rotation of the rotating sleeve 15 is restricted by a key connection with the positioning plate 13. At the same time, when the rotating sleeve 15 descends, it can drive the positioning plate 13 located at the top of the rotating sleeve 15 to descend simultaneously;

[0038] A compression spring 16 is sleeved outside the rotating sleeve 15 and at the bottom of the positioning plate 13. The top of the compression spring 16 is fixed to the positioning plate 13, and the top of the positioning plate 13 is fixed to the rotating sleeve 15. When the positioning plate 13 slides downward outside the rotating sleeve 15, the compression spring 16 is compressed. A lifting drive rotary motor 17 is fixed inside the bottom end of the fixed housing 4. The output end of the lifting drive rotary motor 17 is connected with a lifting threaded rod 18. The outside of the lifting threaded rod 18 is threadedly connected with the rotating sleeve 15, so that the rotation of the lifting threaded rod 18 drives the rotation of the threadedly connected rotating sleeve 15 to drive the positioning plate 13 to disengage from the synchronizing plate 3.

[0039] Refer to Figure 3, the air conditioner unit detection system further includes a control cabinet 6. One side of the control cabinet 6 is fixed with a display screen 7. Thus, when the door 2 on the main body 1 is opened, the travel switch 5 is squeezed to work through the display of the display screen 7, and the display screen 7 shows that there is someone; when the door 2 on the main body 1 is closed, the travel switch resets, and the display screen 7 shows that there is no one, so that other staff members can know more clearly.

[0040] In other embodiments, a controller is also provided. The model of the controller is SC200, and both between the controller and the travel switch 5 and between the controller and the display screen 7 are electrically connected through wires. Thus, when the travel switch 5 is squeezed, the travel switch 5 gives a signal to the controller, and the controller controls the display screen 7 to show that there is someone or no one.

[0041] The usage process of an air conditioner unit detection system with an interlock function provided by the present utility model is as follows: When the interior of the main body 1 is under maintenance, by opening the door 2, the movement of the door 2 drives the synchronous plate 3 to move, and the movement of the synchronous plate 3 brings it closer to the travel switch 5 and squeezes the travel switch 5, so as to notify external personnel that maintenance is in progress through the work of the travel switch 5;

[0042] When the travel switch 5 needs to be replaced, the height adjustment drive motor 11 is powered on to drive the adjustment gear 12 to rotate. The rotation of the adjustment gear 12 drives the engaged lifting plate 10 to rise, and the rise of the lifting plate 10 drives the pressing plate 9 to rise, so that the pressing plate 9 is disengaged from the extrusion of the travel switch 5 inside the assembly frame 8, and then the travel switch 5 is taken out and replaced with a different model;

[0043] At the same time, when the synchronous plate 3 squeezes the travel switch 5, the synchronous plate 3 simultaneously squeezes the extrusion inclined surface 14 to make the positioning plate 13 descend inside the fixed housing 4. At the same time, the descent of the positioning plate 13 descends outside the rotating sleeve 15, and the descent of the positioning plate 13 squeezes the compression spring 16 outside the rotating sleeve 15. When the synchronous plate 3 approaches the travel switch 5 and squeezes the travel switch 5, the positioning plate 13 has no external force extrusion. Through the rebound reset after the compression of the compression spring 16, the position of the synchronous plate 3 is limited. When the synchronous plate 3 needs to be disengaged, the lifting drive rotating motor 17 is powered on to drive the lifting threaded rod 18 to rotate. The rotation of the lifting threaded rod 18 drives the rotation sleeve 15 connected by threads to descend, so that the descent of the rotation sleeve 15 drives the positioning plate 13 to descend, and the synchronous plate 3 is disengaged from the limit of the positioning plate 13.

[0044] Embodiment 2

[0045] Refer to Figures 7 - 9 , an air conditioner unit detection system with an interlock function, a control circuit diagram for receiving signals from the travel switch 5 is installed inside the control cabinet 6;

[0046] The control circuit diagram includes an inverter. One end at the top of the inverter is connected to a travel switch SQ through a wire, and the travel switch SQ is a normally closed contact. On both sides of one end at the bottom of the inverter, a first wire and a second wire are respectively connected. One end of the first wire is connected to a fuse FU through a wire. One end of the fuse FU is connected in parallel with a stop button SB1 through a wire. A start button SB2 is connected in series at the bottom of the stop button SB1. The stop button SB1 is a normally closed contact, and the start button SB2 is a normally open contact. One end of the start button SB2 is connected in parallel with an inverter start relay KA1 through a wire. A maintenance lighting start relay KA2 is connected in series at the bottom of the start button SB2. The bottom of the maintenance lighting start relay KA2 is connected to the second wire. A maintenance lighting lamp EL is connected in parallel at the top of one end of the second wire.

[0047] A stop lamp HR is connected in parallel between the first wire and the second wire and at one end of the stop button SB1. A running lamp HG is connected in parallel between the first wire and the second wire and at one end of the stop lamp HR. A fault lamp PF is connected in parallel between the first wire and the second wire and at one end of the running lamp HG. A normally open point of the inverter alarm is connected in series at the top of the fault lamp PF. The normally open point of the inverter alarm consists of TA and TC. A power supply lamp PW is connected in parallel between the first wire and the second wire and at one end of the fault lamp PF. A maintenance lighting start button SB3 is connected in parallel between the first wire and the second wire and at one end of the power supply lamp PW.

[0048] The usage process of an air conditioner unit detection system with an interlock function provided by the present utility model is as follows: When it is necessary to repair the indoor fan due to an abnormality, press the stop button SB1. The coil of KA1 loses power, the inverter stops working, and the fan stops running. The maintenance personnel open the door of the fan maintenance room. The door touches the travel switch detection device, and the normally closed contact SQ of the travel switch changes from a normally closed point to a normally open point. In the figure, the inverter start signal circuit KA1 and the normally closed contact SQ of the travel switch form a chain. The normally closed contact SQ of the travel switch changes from normally closed to normally open, and the fan inverter cannot be started. This can effectively prevent outdoor personnel from accidentally starting the fan equipment through the control cabinet start button SB2 during the maintenance process, constituting the first fan start interlock protection circuit.

[0049] The maintenance personnel enter the maintenance room and press the SB3 button. At this time, the coil of KA2 is energized, the normally open contact of KA2 becomes normally closed, and the maintenance lighting lamp EL in the maintenance room lights up. At the same time, the normally closed contact of KA2 becomes a normally open contact, and the normally closed contact of KA2 and the start-stop control circuit of the inverter form an interlock. At this time, because the normally closed point of KA2 becomes a normally open point, the inverter start circuit is disconnected. When the maintenance lighting is turned on, it can effectively prevent outdoor personnel from accidentally starting the fan equipment through the control cabinet start button SB2 during the maintenance process, constituting the second fan start interlock protection circuit.

[0050] This first and second fan start interlock protection circuit, through double interlocks, can effectively prevent outdoor personnel from causing personal injuries due to accidentally starting the fan equipment during the maintenance process, ensuring maintenance safety.

[0051] When the fan maintenance operation is completed, press the SB3 maintenance lamp button. The SB3 contact restores to the open state, the KA2 coil loses power, and the normally open contact of KA2 restores to its original normally open state, and the maintenance lamp EL is turned off. At the same time, the normally closed contact of KA2 restores to its original normally closed state, and the normally closed point of KA2 and the KA1 coil are connected in series to form a start preparation circuit. When the maintenance room door is closed, the travel switch SQ contact restores to its original normally closed state, and KA1 and the travel switch SQ are connected in series to form a frequency converter start signal circuit, and the frequency converter waits to start. When the maintenance lighting EL is turned off and the maintenance room door is closed, at this time, press the SB2 start button, the frequency converter works and the fan starts normally. When the fan frequency converter detects an abnormal state during operation and triggers an alarm signal, TA and TC are closed, and the fault lamp PF lights up to ensure the normal operation of the fan equipment.

[0052] The above-disclosed preferred embodiments of the present invention are only used to help illustrate the present invention. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention.

Claims

1. An air conditioner unit detection system with an interlocking function, characterized in that: It includes a main body, a switch door is slidably connected inside the main body, a fixed shell is additionally installed on one side of the main body, a synchronous plate is fixed at a position corresponding to the fixed shell on one side of the switch door, a travel switch is installed at one end of the fixed shell close to the synchronous plate, and a positioning mechanism for fixing the travel switch and a limiting mechanism for positioning the synchronous plate are installed on the fixed shell. When the switch door is opened, the synchronous plate presses the travel switch, so as to notify external personnel that maintenance is in progress through the operation of the travel switch.

2. The air conditioner unit detection system with an interlocking function according to claim 1, characterized in that: The positioning mechanism includes an assembly frame, a pressure plate, a lifting plate, a height adjustment drive motor and an adjustment gear. An assembly frame is fixed outside the bottom end of the travel switch at one end of the fixed shell close to the synchronous plate. The travel switch is slidably connected with the assembly frame. A pressure plate is slidably connected above the travel switch inside the fixed shell. A lifting plate is fixed at the bottom of the pressure plate. A height adjustment drive motor is fixed inside the fixed shell. The output end of the height adjustment drive motor is connected with an adjustment gear, and the adjustment gear is meshed with the lifting plate. The pressure plate is driven to lift by the height adjustment drive motor, so as to fix the travel switch located inside the assembly frame by extrusion through the downward movement of the pressure plate.

3. The air conditioner unit detection system with an interlocking function according to claim 2, characterized in that: Anti-slip pads are fixed on the inner side of the assembly frame and the bottom of the pressure plate.

4. The air conditioner unit detection system with an interlocking function according to claim 1, characterized in that: The model of the travel switch is YBLXW-5-11D1.

5. The air conditioner unit detection system with an interlocking function according to claim 1, characterized in that: The limiting mechanism includes a positioning plate, a rotating sleeve, a compression spring lifting drive rotary motor and a lifting threaded rod. A positioning plate is connected inside the fixed shell. An extrusion inclined surface is provided at one end of the positioning plate close to the synchronous plate. A rotating sleeve is slidably connected inside the positioning plate at the end far from the synchronous plate. A compression spring is sleeved outside the rotating sleeve and at the bottom of the positioning plate. The top of the compression spring is fixed to the positioning plate, and the top of the positioning plate is fixed to the rotating sleeve. A lifting drive rotary motor is fixed inside the bottom end of the fixed shell. The output end of the lifting drive rotary motor is connected with a lifting threaded rod, and the outer side of the lifting threaded rod is threadedly connected with the rotating sleeve.

6. A detection system for an air conditioner unit with an interlocking function according to any one of claims 1 to 5, characterized in that: The air conditioner unit detection system further includes a control cabinet, and a display screen is fixed on one side of the control cabinet. The display screen is used to display whether there is someone or no one in the maintenance room.

7. The air conditioner unit detection system with an interlocking function according to claim 6, characterized in that: A controller is further arranged inside the control cabinet. The controller is electrically connected to the travel switch and the display screen through wires respectively. When the travel switch is pressed, the travel switch gives a signal to the controller, and the controller controls the display screen to display whether there is someone or no one.

8. The air conditioner unit detection system with an interlocking function according to claim 7, wherein: The model of the controller is SC200.

9. The air conditioner unit detection system with an interlocking function according to claim 6, characterized in that: A control circuit for receiving the signal of the travel switch is installed inside the control cabinet; the control circuit includes a frequency converter. One end of the top of the frequency converter is connected to a travel switch SQ through a wire, and the travel switch SQ is a normally closed contact. Both sides of one end of the bottom of the frequency converter are respectively connected to a first wire and a second wire. One end of the first wire is connected to a fuse FU through a wire. One end of the fuse FU is connected in parallel with a stop button SB1 through a wire. The bottom of the stop button SB1 is connected in series with a start button SB2. The stop button SB1 is a normally closed contact, and the start button SB2 is a normally open contact. One end of the start button SB2 is connected in parallel with a frequency converter start relay KA1 through a wire. The bottom of the start button SB2 is connected in series with a maintenance lighting start relay KA2. The bottom of the maintenance lighting start relay KA2 is connected to the second wire. The top of one end of the second wire is connected in parallel with a maintenance lighting lamp EL.

10. The air conditioner unit detection system with an interlocking function according to claim 9, characterized in that: A stop lamp HR is connected in parallel between the first wire and the second wire and at one end of the stop button SB1. A running lamp HG is connected in parallel between the first wire and the second wire and at one end of the stop lamp HR. A fault lamp PF is connected in parallel between the first wire and the second wire and at one end of the running lamp HG. The top of the fault lamp PF is connected in series with a normally open point of the frequency converter alarm. A power supply lamp PW is connected in parallel between the first wire and the second wire and at one end of the fault lamp PF. A maintenance lighting start button SB3 is connected in parallel between the first wire and the second wire and at one end of the power supply lamp PW.

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