Energy-saving circuit of air compressor

Abstract

The present invention provides an energy-saving circuit for an air compressor, which can not only avoid damage to the compressor caused by emergency stop, but also effectively save energy; the circuit comprises a three-phase power supply, a compressor M1, contactors KM1-KM4, a time delay relay KT, a time-space switch power supply SK, a controller U, a transformer T1, a fan motor M2, fuses FU1-FU5, switching switches SV1, SV2, an emergency stop switch SB1, an emergency switch SB2, and a start switch SB3.

Description

Technical Field

[0001] The invention relates to the technical field of air compressor equipment, in particular to an energy-saving circuit of an air compressor. Background Art

[0002] Due to the different working schedules of each workshop, the start and stop of the existing air compressors are difficult to control. If staff are arranged to shut down the air compressors after get off work, they often forget to do so. The existing air compressors have a power of 75 kilowatts and are high-power electrical equipment. If they are turned on when not in use, it will cause a huge waste of energy. When the air compressors are operating normally, forced power outages or emergency shutdowns will cause certain harm to the air compressors. Summary of the invention

[0003] In view of the above problems, the present invention provides an energy-saving circuit for an air compressor, which can not only avoid damage to the compressor caused by emergency stop, but also effectively save energy.

[0004] The technical scheme is as follows: it includes a three-phase power supply, a compressor M1, and is characterized in that: it also includes contactors KM1-KM4, a time delay relay KT, a time-space switch power supply SK, a controller U, a transformer T1, a fan motor M2, fuses FU1-FU5, a switching switch SV1, SV2, an emergency stop switch SB1, an emergency switch SB2, and a start switch SB3, wherein the controller U is a PLC controller, and the main contacts KM1-1, KM3-1, and KM3-2 of the contactors KM1, KM3, and KM4 are One end of the main contact KM4-1 is respectively connected to the L1, L2, and L3 terminals of the three-phase power supply, the other end of the main contact KM4-1 is connected to the fan motor M2, the three terminals at the other end of the main contact KM1-1 are respectively connected to the U1, V1, and W1 terminals of the compressor M1, the three terminals at one end of the main contact KM2-1 of the contactor KM2 are connected, and the three terminals at the other ends of the main contacts KM2-1 and KM3-1 are respectively connected to the U2, V3, and W2 terminals of the compressor M1;

[0005] Pin 80 of the controller U is connected to one end of the emergency switch SB2 via the normally closed contact KT-1 of the delay relay KT, pin 82 of the controller U is connected to one end of the start switch SB3, pin 83 of the controller U is connected to one end of the normally open contact KM4-2 of the contactor KM4, and the other ends of the emergency switch SB2, the start switch SB3, and the normally open contact KM4-2 are all connected to pin 81 of the controller U;

[0006] One end of the space-time switch power supply SK and its normally open contact SK-1 are connected to the 32nd foot of the controller U, and the other end of the normally open contact SK-1 is connected to the 33rd foot of the controller U through the normally closed contact KM1-3 of the contactor KM1 and the time delay relay KT;

[0007] One end of the fuses FU1 and FU2 is connected to the L1 and L3 ends of the three-phase power supply respectively, one end of the fuses FU4 and FU5 is connected to the 32nd and 33rd pins of the controller U respectively, one end of the fuse FU3 is connected to the 34th pin of the controller U via the emergency stop switch SB1, one end of the contactor KM4 is connected to the 34th pin of the controller U via the normally open contact KM1-2 of the contactor KM1, the other ends of the fuses FU1~FU5 and the contactor KM4 are connected to the transformer T1, the One end of the switching switches SV1 and SV2 are respectively connected to pins 43 and 44 of the controller U, one end of the contactor KM3 is connected to pin 42 of the controller U via the normally closed contact KM2-2 of the contactor KM2, one end of the contactor KM2 is connected to pin 41 of the controller U via the normally closed contact KM3-2 of the contactor KM3, one end of the contactor KM1 is connected to pin 40 of the controller U, and the other ends of the contactors KM1~KM3 and the switching switches SV1 and SV2 are connected to the transformer T1.

[0008] It is further characterized by:

[0009] The space-time switch power supply SK adopts AC220V; the delay time of the delay relay K is 3min.

[0010] The beneficial effect of the present invention is that it can delay the compressor in standby mode and shut it down in time periods, thereby effectively saving energy and avoiding damage to the compressor caused by emergency stop. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the electrical schematic diagram of the present invention. DETAILED DESCRIPTION

[0012] like Figure 1As shown, the energy-saving circuit of the air compressor of the present invention includes a three-phase power supply, a compressor M1, contactors KM1-KM4, a time delay relay KT, a time-space switch power supply SK, a controller U, a transformer T1, a fan motor M2, fuses FU1-FU5, switching switches SV1, SV2, an emergency stop switch SB1, an emergency switch SB2, and a start switch SB3. The controller U is a PLC controller. One end of the main contacts KM1-1, KM3-1, and KM4-1 of the contactors KM1, KM3, and KM4 are respectively connected to the L1, L2, and L3 ends of the three-phase power supply, and the other end of the main contact KM4-1 is connected to the fan motor M2. The other end of the main contact KM1-1 The three terminals of the controller U are connected to the U1, V1, and W1 terminals of the compressor M1 respectively, and the three terminals of one end of the main contact KM2-1 of the contactor KM2 are connected, and the three terminals of the other end of the main contacts KM2-1 and KM3-1 are connected to the U2, V3, and W2 terminals of the compressor M1 respectively; the 80th foot of the controller U is connected to one end of the emergency switch SB2 through the normally closed contact KT-1 of the delay relay KT, the 82nd foot of the controller U is connected to one end of the starting switch SB3, and the 83rd foot of the controller U is connected to one end of the normally open contact KM4-2 of the contactor KM4, and the other ends of the emergency switch SB2, the starting switch SB3, and the normally open contact KM4-2 are connected to the controller U. 81 feet are connected; one end of the space-time switch power supply SK and its normally open contact SK-1 are connected to the 32nd foot of the controller U, and the other end of the normally open contact SK-1 is connected to the 33rd foot of the controller U through the normally closed contact KM1-3 of the contactor KM1 and the time delay relay KT; one end of the fuse FU1 and FU2 are respectively connected to the L1 and L3 ends of the three-phase power supply, one end of the fuse FU4 and FU5 are respectively connected to the 32nd and 33rd feet of the controller U, one end of the fuse FU3 is connected to the 34th foot of the controller U through the emergency stop switch SB1, one end of the contactor KM4 is connected to the 34th foot of the controller U through the normally open contact KM1-2 of the contactor KM1, and the fuse FU 1~FU5 and the other end of contactor KM4 are connected to transformer T1, one end of switching switches SV1 and SV2 are connected to pins 43 and 44 of controller U respectively, one end of contactor KM3 is connected to pin 42 of controller U via normally closed contact KM2-2 of contactor KM2, one end of contactor KM2 is connected to pin 41 of controller U via normally closed contact KM3-2 of contactor KM3, one end of contactor KM1 is connected to pin 40 of controller U, the other ends of contactors KM1~KM3 and switching switches SV1 and SV2 are connected to transformer T1; the time-space switch power supply SK adopts AC220V; the delay time of delay relay K is 3min.

[0013] In the present invention, a 3-minute delay is achieved in the idle standby state of the compressor, and shutdown is given in different time periods; when the workshop needs compressed air, it can be manually started; during the night rest time, it can be detected that the workshop does not need compressed air, and the shutdown will be automatically delayed, thereby not only effectively saving energy, but also avoiding damage to the compressor due to emergency stop; specifically, the emergency switch SB2 between the 80th and 81st feet of the controller U is connected in series with a normally closed contact KT-1 of a time delay relay KT with a delayed disconnection. Once the normally closed contact KT-1 is disconnected, the entire compressor will also be shut down, and it must be started manually if it is to be started again; the first time period of the normally open contact SK-1 of the time-space switch power supply SK is set to 17:35-17: 50. During this time period, the normally open contact SK-1 will be connected; and through the normally closed contact KM1-3, the entire compressor M1 can be shut down only when the fan motor M2 is in the shutdown state; the delay relay KT is set to 3 minutes. When the fan motor M2 is detected to be shut down, some time can be left for the compressor M1 to allow other equipment to stop working; the second time period of the normally open contact SK-1 of the time-space switch power supply SK is set to 20:00-20:15 from Monday to Friday. If someone uses gas in the first time period and the compressor M1 fails to shut down, the compressor M1 will be shut down in the second time period, thereby realizing the shutdown in time periods, effectively saving energy, and avoiding damage to the compressor due to emergency stop.

Claims

1. The energy-saving circuit of the air compressor includes a three-phase power supply, a compressor M1, Features: It also includes contactors KM1~KM4, a time delay relay KT, a time-space switch power supply SK, a controller U, a transformer T1, a fan motor M2, fuses FU1~FU5, switches SV1, SV2, an emergency stop switch SB1, an emergency switch SB2, and a start switch SB3. The controller U is a PLC controller. The main contacts KM1-1, KM3-1, and KM4-1 of the contactors KM1, KM3, and KM4 are respectively connected to the three The L1, L2, and L3 terminals of the phase power supply, the other end of the main contact KM4-1 is connected to the fan motor M2, the three terminals at the other end of the main contact KM1-1 are respectively connected to the U1, V1, and W1 terminals of the compressor M1, the three terminals at one end of the main contact KM2-1 of the contactor KM2 are connected, and the three terminals at the other ends of the main contacts KM2-1 and KM3-1 are respectively connected to the U2, V3, and W2 terminals of the compressor M1; Pin 80 of the controller U is connected to one end of the emergency switch SB2 via the normally closed contact KT-1 of the delay relay KT, pin 82 of the controller U is connected to one end of the start switch SB3, pin 83 of the controller U is connected to one end of the normally open contact KM4-2 of the contactor KM4, and the other ends of the emergency switch SB2, the start switch SB3, and the normally open contact KM4-2 are all connected to pin 81 of the controller U; One end of the space-time switch power supply SK and its normally open contact SK-1 are connected to the 32nd foot of the controller U, and the other end of the normally open contact SK-1 is connected to the 33rd foot of the controller U through the normally closed contact KM1-3 of the contactor KM1 and the time delay relay KT; One end of the fuses FU1 and FU2 are respectively connected to the L1 and L3 ends of the three-phase power supply, one end of the fuses FU4 and FU5 are respectively connected to the 32nd and 33rd pins of the controller U, one end of the fuse FU3 is connected to the 34th pin of the controller U via the emergency stop switch SB1, one end of the contactor KM4 is connected to the 34th pin of the controller U via the normally open contact KM1-2 of the contactor KM1, and the other ends of the fuses FU1~FU5 and the contactor KM4 are all connected to the transformer T1. One end of the switching switches SV1 and SV2 are respectively connected to pins 43 and 44 of the controller U, one end of the contactor KM3 is connected to pin 42 of the controller U via the normally closed contact KM2-2 of the contactor KM2, one end of the contactor KM2 is connected to pin 41 of the controller U via the normally closed contact KM3-2 of the contactor KM3, one end of the contactor KM1 is connected to pin 40 of the controller U, and the other ends of the contactors KM1~KM3 and the switching switches SV1 and SV2 are connected to the transformer T1.

2. The energy-saving circuit of the air compressor according to claim 1, Features: The space-time switch power supply SK adopts AC220V; the delay time of the delay relay KT is 3min.

Images