CN211579581U - Power-off protection system for motor of compressor of refrigerating unit - Google Patents
Power-off protection system for motor of compressor of refrigerating unit Download PDFInfo
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- CN211579581U CN211579581U CN202020296930.7U CN202020296930U CN211579581U CN 211579581 U CN211579581 U CN 211579581U CN 202020296930 U CN202020296930 U CN 202020296930U CN 211579581 U CN211579581 U CN 211579581U
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Abstract
The utility model relates to a power-off protection system for a compressor motor of a refrigerating unit, belonging to the technical field of compressor motor protection and comprising a compressor motor, a motor protector and a fuse protector; the compressor motor is connected with a three-phase alternating current power live wire through a normally open contact of a first three-phase contactor, a first three-phase current transformer and a first three-phase circuit breaker in sequence, and is also connected with the first three-phase circuit breaker through a normally open contact of a second three-phase contactor and a second three-phase current transformer in sequence; a shunt release is arranged in the first three-phase circuit breaker; one end of a coil of the motor protector is connected with one end of a normally open contact of the motor protector, and the other end of the coil of the motor protector is connected with a zero line; the other end of the normally open contact of the motor protector is connected with the shunt release; fuse one end loops through first three phase contactor normally open contact, first three phase current transformer, first three phase circuit breaker and connects the third live wire, and motor protector coil one end is connected to the other end. The utility model discloses can carry out power-off protection to the compressor motor.
Description
Technical Field
The utility model belongs to the technical field of the compressor motor protection technique and specifically relates to a compressor motor power-off protection system of refrigeration unit is related to.
Background
The refrigeration unit compressor is the core of the refrigeration system and is commonly referred to as the main machine in the refrigeration unit. Fig. 1 is an electrical schematic diagram of a main power supply part of a motor of an existing refrigeration compressor, as shown in fig. 1, a motor M1 of the refrigeration compressor is started by a split winding, two contactors, namely a first three-phase contactor KM1 and a second three-phase contactor KM2, are required, a first three-phase breaker QF1 is connected to three live wires of a three-phase alternating current power supply, and a first three-phase thermal relay FR1 and an ammeter a in the diagram jointly form a thermal protection part of the motor. If any one of the first three-phase contactor KM1 and the second three-phase contactor KM2 generates adhesion fault (such as poor contact of contacts, arc welding, too high operation frequency) or overload of the motor, the motor of the compressor is burnt out, and loss is caused.
However, there is no motor protection scheme that can solve the above problems, and therefore, a system that can timely detect overload of a compressor motor or adhesion failure of a contactor and protect the motor is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compressor motor power-off protection system of refrigerating unit can in time discover compressor motor overload or contactor adhesion trouble and protect the motor to the not enough of prior art existence.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a power-off protection system for compressor motors of a refrigerating unit comprises a compressor motor M1, a motor protector F, a fuse FU, a first three-phase contactor KM1, a second three-phase contactor KM2 and a first three-phase circuit breaker QF 1; the motor protector F comprises a first three-phase current transformer TA1 and a second three-phase current transformer TA 2; the compressor motor M1 is connected with a first live wire L1, a second live wire L2 and a third live wire L3 of a three-phase alternating-current power supply sequentially through a normally open contact of a main loop of the first three-phase contactor KM1, the first three-phase current transformer TA1 and the first three-phase breaker QF 1; the compressor motor M1 is further connected with a first live wire L1, a second live wire L2 and a third live wire L3 of the three-phase alternating-current power supply sequentially through a normally open contact of a main loop of the second three-phase contactor KM2, the second three-phase current transformer TA2 and the first three-phase breaker QF 1; a shunt release MX is arranged in the first three-phase circuit breaker QF1 and is connected with a zero line N; one end of the F coil of the motor protector is connected with one end of a normally open contact of the motor protector F, the other end of the F coil of the motor protector is connected with the zero line N, and the other end of the normally open contact of the motor protector F is connected with a tripping signal input end of the shunt release MX; one end of the fuse FU sequentially passes through a normally open contact of a main loop of the first three-phase contactor KM1, the first three-phase current transformer TA1 and the first three-phase breaker QF1 to be connected with the third live wire L3, and the other end of the fuse FU is connected with one end of a F coil of the motor protector.
By adopting the technical scheme, the shunt release MX is installed in the first three-phase circuit breaker QF1 of the main power supply of the compressor, the two current transformers of the motor protector F are respectively installed on the main power supply sides of the first three-phase contactor KM1 and the second three-phase contactor KM2 of the main power supply of the compressor, if the motor of the compressor is overloaded and exceeds a setting current value or any one contactor generates an adhesion fault, the normally open contact of the built-in relay of the motor protector is closed, the shunt release MX in the first three-phase circuit breaker QF1 acts to disconnect the main power supply, the compressor is powered off, the motor of the compressor is prevented from being burnt out, the overload or adhesion fault of the contactor of the motor of the compressor.
The present invention may be further configured in a preferred embodiment as: the device also comprises an alarm BZ, an intermediate relay KA, a single-phase breaker QF2 and a button switch normally closed contact SB; one end of the alarm BZ is connected with one end of the normally open contact of the intermediate relay KA, and the other end of the alarm BZ is connected with the zero line N; one end of the normally open contact of the intermediate relay KA is connected with one end of the coil of the intermediate relay KA, and the other end of the normally open contact of the intermediate relay KA is connected with the third live wire L3 through the normally closed contact SB of the button switch and the single-phase circuit breaker QF2 in sequence; one end of the intermediate relay KA coil is connected with the other end of the normally open contact of the motor protector F, and the other end of the intermediate relay KA coil is connected with the zero line N.
By adopting the technical scheme, when the compressor is powered off, the intermediate relay KA acts to enable the alarm BZ to send out an alarm signal, so that an operator on duty can check and remove faults on site in time; after the fault is removed, the intermediate relay KA is reset, the alarm BZ stops giving an alarm, the first three-phase circuit breaker QF1 is closed, the compressor is restarted, and the refrigerating unit operates normally.
The present invention may be further configured in a preferred embodiment as: the system also comprises an alarm BZ, an intermediate relay KA, a button switch normally closed contact SB and an evaporative cold water pump main power supply circuit; the main power circuit of the evaporative cold water pump comprises a second three-phase circuit breaker QF3 and an evaporative cold water pump motor M2, and the evaporative cold water pump motor M2 is connected with a first live wire L1, a second live wire L2 and a third live wire L3 of the three-phase alternating-current power supply through the second three-phase circuit breaker QF 3; one end of the alarm BZ is connected with one end of the normally open contact of the intermediate relay KA, and the other end of the alarm BZ is connected with the zero line N; one end of the normally open contact of the intermediate relay KA is connected with one end of the coil of the intermediate relay KA, and the other end of the normally open contact of the intermediate relay KA is connected with the third live wire L3 through the normally closed contact SB of the button switch and the second three-phase circuit breaker QF3 in sequence; one end of the intermediate relay KA coil is connected with the other end of the normally open contact of the motor protector F, and the other end of the intermediate relay KA coil is connected with the zero line N.
By adopting the technical scheme, the original main power supply of the evaporation cold water pump in the refrigerating unit is used for providing power for the alarm BZ, and the intermediate relay KA acts to enable the alarm BZ to send out an alarm signal when the compressor is powered off, so that an operator on duty can check and remove faults on site in time; after the fault is removed, the intermediate relay KA is reset, the alarm BZ stops giving an alarm, the first three-phase circuit breaker QF1 is closed, the compressor is restarted, and the refrigerating unit operates normally.
The present invention may be further configured in a preferred embodiment as: the alarm BZ is any one or more of a buzzer alarm, a vibration alarm or a light alarm.
By adopting the technical scheme, the motor overload or contactor adhesion fault can be alarmed through buzzing, vibrating, lighting and other modes, so that an attendant can be reminded to find abnormality as soon as possible.
The present invention may be further configured in a preferred embodiment as: the type of the buzzer alarm is APTAD16-22 SM.
The present invention may be further configured in a preferred embodiment as: the model of the intermediate relay KA is Jiale RMIA45220 VAC.
The present invention may be further configured in a preferred embodiment as: the motor protector F is an SM501-2AM intelligent digital display motor protector.
The present invention may be further configured in a preferred embodiment as: the compressor motor M1 is a semi-closed screw compressor motor.
The present invention may be further configured in a preferred embodiment as: the model of the first three-phase breaker QF1 is LS ABS203b 1175A.
To sum up, the utility model discloses a following at least one useful technological effect:
1. the shunt release MX is installed in a first three-phase breaker QF1 of a main power supply of the compressor, two current transformers of a motor protector F are respectively installed on the main power supply sides of a first three-phase contactor KM1 and a second three-phase contactor KM2 of the main power supply of the compressor, if the overload of a motor of the compressor exceeds a setting current value or any one of the contactors generates an adhesion fault, a relay action normally-open contact in the motor protector is closed, the shunt release MX in the first three-phase breaker QF1 acts to disconnect the main power supply, the compressor is powered off, the motor of the compressor is prevented from being burnt out, the overload of the motor of the compressor or the adhesion fault of the contactors can be timely;
2. when the compressor is powered off, the intermediate relay KA acts to enable the alarm BZ to send out an alarm signal, so that an operator on duty can check and remove faults on site in time; after the fault is removed, the intermediate relay KA is reset, the alarm BZ stops giving an alarm, the first three-phase circuit breaker QF1 is closed, the compressor is restarted, and the refrigerating unit operates normally.
Drawings
Figure 1 is an electrical schematic of the main power supply portion of a compressor motor of a prior art refrigeration unit.
Fig. 2 is an electrical schematic diagram of a system according to an embodiment of the present invention.
Fig. 3 is an electrical schematic diagram of a system according to a second embodiment of the present invention.
Fig. 4 is an electrical schematic diagram of a system according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 2, the power-off protection system for the compressor motor of the refrigeration unit provided by the embodiment includes a compressor motor M1, a motor protector F, a fuse FU, a first three-phase contactor KM1, a second three-phase contactor KM2, and a first three-phase circuit breaker QF 1; the motor protector F includes a first three-phase current transformer TA1 and a second three-phase current transformer TA 2.
The compressor motor M1 is connected with a first live wire L1, a second live wire L2 and a third live wire L3 of a three-phase alternating-current power supply sequentially through a first three-phase contactor KM1 main circuit normally-open contact, a first three-phase current transformer TA1 and a first three-phase breaker QF 1; the compressor motor M1 is further connected with a first live wire L1, a second live wire L2 and a third live wire L3 of the three-phase alternating-current power supply sequentially through a second three-phase contactor KM2 main circuit normally open contact, a second three-phase current transformer TA2 and a first three-phase breaker QF 1.
A shunt release MX is arranged in the first three-phase circuit breaker QF1 and is connected with a zero line N; one end of a coil F of the motor protector is connected with one end of a normally open contact of the motor protector F, the other end of the coil F of the motor protector is connected with a zero line N, and the other end of the normally open contact of the motor protector F is connected with a tripping signal input end of a shunt release MX; one end of the fuse FU is connected with a third live wire L3 through a first three-phase contactor KM1 main circuit normally open contact, a first three-phase current transformer TA1 and a first three-phase breaker QF1 in sequence, and the other end of the fuse FU is connected with one end of a motor protector F coil.
Optionally, the motor protector F is an SM501-2AM intelligent digital display motor protector; the compressor motor M1 is a semi-closed screw compressor motor; the model number of the first three-phase breaker QF1 is LS ABS203b 1175A; the shunt release MX is in the model of LS power generation ST200CH200 and is provided with a group of mechanical normally closed contacts, and after the shunt release MX acts, a power supply for supplying power to the shunt release MX can be automatically cut off, so that a coil of the shunt release MX is prevented from being burnt; fuse FU selects 1A's fast acting fuse, plays the effect of breaking apart and protection motor protector F.
The working principle of the embodiment is as follows: closing the first three-phase breaker QF1, starting a compressor motor M1, attracting the first three-phase contactor KM1 and the second three-phase contactor KM2, and electrifying a motor protector F; when a coil of the motor protector F detects that the current induced by any one of the first three-phase current transformer TA1 and the second three-phase current transformer TA2 is in a phase failure state or is larger than a set value, it is indicated that the first three-phase contactor KM1 and the second three-phase contactor KM2 are likely to have an adhesion fault or motor overload, a relay arranged in the motor protector F acts, a normally open contact of the motor protector F is closed, the shunt release tripper MX acts, the first three-phase breaker QF1 is tripped to separate a brake, a main power supply of the compressor motor M1 is disconnected, the compressor motor M1 is de-energized, the compressor motor M1 is prevented from being burnt due to the adhesion fault of the contactors or the overload, and the compressor motor M1 is.
Example two:
referring to fig. 3, the power-off protection system for the compressor motor of the refrigeration unit provided in this embodiment is additionally provided with an alarm BZ, an intermediate relay KA, a single-phase circuit breaker QF2, and a normally closed contact SB of a push switch on the basis of the first embodiment; one end of the alarm BZ is connected with one end of a normally open contact of the intermediate relay KA, and the other end of the alarm BZ is connected with the zero line N; one end of a normally open contact of the intermediate relay KA is connected with one end of a coil of the intermediate relay KA, and the other end of the normally open contact of the intermediate relay KA is connected with a third live wire L3 through a normally closed contact SB of a button switch and a single-phase breaker QF2 in sequence; one end of the intermediate relay KA coil is also connected with the other end of the normally open contact of the motor protector F, and the other end of the intermediate relay KA coil is connected with the zero line N.
Optionally, the single-phase circuit breaker QF2 is BKN1PD 10A; the intermediate relay KA is Jiale RMIA45220 VAC.
The working principle of the embodiment is as follows: the first three-phase circuit breaker QF1 and the single-phase circuit breaker QF2 are closed, the compressor motor M1 is started, the first three-phase contactor KM1 and the second three-phase contactor KM2 are attracted, and the motor protector F is electrified; when a coil of the motor protector F detects that the current induced by any one of the first three-phase current transformer TA1 and the second three-phase current transformer TA2 is in a phase failure state or is larger than a set value, it is indicated that the first three-phase contactor KM1 and the second three-phase contactor KM2 are likely to have an adhesion fault or motor overload, a relay arranged in the motor protector F acts, a normally open contact of the motor protector F is closed, the shunt release tripper MX acts, the first three-phase breaker QF1 is tripped to separate a brake, a main power supply of the compressor motor M1 is disconnected, the compressor motor M1 is de-energized, the compressor motor M1 is prevented from being burnt due to the adhesion fault of the contactors or the overload, and the compressor motor M1 is.
After a normally open contact of a motor protector F is closed, a shunt release MX is electrified, an intermediate relay KA is electrified to act, the normally open contact of the intermediate relay KA is closed, the intermediate relay KA is self-locked, an alarm BZ is electrified to work, and an alarm signal is sent; after finding the alarm, the person on duty checks the fault on site, presses the normally closed contact SB of the button switch after the fault is eliminated, the relay KA loses power and resets, and the alarm BZ stops alarming; the first three-phase breaker QF1 is closed and the compressor motor M1 is restarted.
Example three:
referring to fig. 4, the refrigeration unit compressor motor power-off protection system provided in this embodiment is different from the second embodiment only in that: the main power supply of the original evaporative cold water pump in the refrigerating unit is used for providing power supply for the alarm BZ.
Specifically, the system also comprises an alarm BZ, an intermediate relay KA, a button switch normally closed contact SB and an evaporation cold water pump main power supply circuit; the main power circuit of the evaporative cold water pump comprises a second three-phase circuit breaker QF3 and an evaporative cold water pump motor M2, wherein the evaporative cold water pump motor M2 is connected with a first live wire L1, a second live wire L2 and a third live wire L3 of a three-phase alternating current power supply through the second three-phase circuit breaker QF 3; one end of the alarm BZ is connected with one end of a normally open contact of the intermediate relay KA, and the other end of the alarm BZ is connected with the zero line N; one end of a normally open contact of the intermediate relay KA is connected with one end of a coil of the intermediate relay KA, and the other end of the normally open contact of the intermediate relay KA is connected with a third live wire L3 through a normally closed contact SB of the button switch and a second three-phase circuit breaker QF3 in sequence; one end of the intermediate relay KA coil is also connected with the other end of the normally open contact of the motor protector F, and the other end of the intermediate relay KA coil is connected with the zero line N.
Optionally, the second three-phase breaker QF3 is model LS ABS203b 1175A; the intermediate relay KA is Jiale RMIA45220 VAC.
The working principle of the embodiment is as follows: closing the first three-phase circuit breaker QF3, and starting the evaporative cold water pump motor M2; closing the first three-phase breaker QF1, starting a compressor motor M1, attracting the first three-phase contactor KM1 and the second three-phase contactor KM2, and electrifying a motor protector F; when a coil of the motor protector F detects that the current induced by any one of the first three-phase current transformer TA1 and the second three-phase current transformer TA2 is in a phase failure state or is larger than a set value, it is indicated that the first three-phase contactor KM1 and the second three-phase contactor KM2 are likely to have an adhesion fault or motor overload, a relay arranged in the motor protector F acts, a normally open contact of the motor protector F is closed, the shunt release tripper MX acts, the first three-phase breaker QF1 is tripped to separate a brake, a main power supply of the compressor motor M1 is disconnected, the compressor motor M1 is de-energized, the compressor motor M1 is prevented from being burnt due to the adhesion fault of the contactors or the overload, and the compressor motor M1 is.
After a normally open contact of a motor protector F is closed, a shunt release MX is electrified, an intermediate relay KA is electrified to act, the normally open contact of the intermediate relay KA is closed, the intermediate relay KA is self-locked, an alarm BZ is electrified to work, and an alarm signal is sent; after finding the alarm, the person on duty checks the fault on site, presses the normally closed contact SB of the button switch after the fault is eliminated, the relay KA loses power and resets, and the alarm BZ stops alarming; the first three-phase breaker QF1 is closed and the compressor motor M1 is restarted.
In the second and third embodiments, the alarm BZ may be any one or more of a buzzer alarm, a vibrating alarm or a light alarm. Wherein the type of the buzzer alarm can be APT AD16-22 SM; the vibration alarm is a touch alarm capable of generating vibration and can give an alarm by generating vibration; the light alarm can be set as an LED lamp, and light alarm is sent out through continuous flashing or long-time lighting of the LED lamp. In the concrete implementation, when reporting to the police, can adopt one or more among the above-mentioned alarm to report to the police, the utility model discloses do not do specific restriction to this.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (9)
1. The power-off protection system for the compressor motor of the refrigerating unit is characterized by comprising a compressor motor M1, a motor protector F, a fuse FU, a first three-phase contactor KM1, a second three-phase contactor KM2 and a first three-phase breaker QF 1; the motor protector F comprises a first three-phase current transformer TA1 and a second three-phase current transformer TA 2;
the compressor motor M1 is connected with a first live wire L1, a second live wire L2 and a third live wire L3 of a three-phase alternating-current power supply sequentially through a normally open contact of a main loop of the first three-phase contactor KM1, the first three-phase current transformer TA1 and the first three-phase breaker QF 1;
the compressor motor M1 is further connected with a first live wire L1, a second live wire L2 and a third live wire L3 of the three-phase alternating-current power supply sequentially through a normally open contact of a main loop of the second three-phase contactor KM2, the second three-phase current transformer TA2 and the first three-phase breaker QF 1;
a shunt release MX is arranged in the first three-phase circuit breaker QF1 and is connected with a zero line N;
one end of the F coil of the motor protector is connected with one end of a normally open contact of the motor protector F, the other end of the F coil of the motor protector is connected with the zero line N, and the other end of the normally open contact of the motor protector F is connected with a tripping signal input end of the shunt release MX;
one end of the fuse FU sequentially passes through a normally open contact of a main loop of the first three-phase contactor KM1, the first three-phase current transformer TA1 and the first three-phase breaker QF1 to be connected with the third live wire L3, and the other end of the fuse FU is connected with one end of a F coil of the motor protector.
2. The refrigeration unit compressor motor power-off protection system as set forth in claim 1 further including an alarm BZ, an intermediate relay KA, a single-phase circuit breaker QF2 and a push-button switch normally closed contact SB;
one end of the alarm BZ is connected with one end of the normally open contact of the intermediate relay KA, and the other end of the alarm BZ is connected with the zero line N;
one end of the normally open contact of the intermediate relay KA is connected with one end of the coil of the intermediate relay KA, and the other end of the normally open contact of the intermediate relay KA is connected with the third live wire L3 through the normally closed contact SB of the button switch and the single-phase circuit breaker QF2 in sequence;
one end of the intermediate relay KA coil is connected with the other end of the normally open contact of the motor protector F, and the other end of the intermediate relay KA coil is connected with the zero line N.
3. The refrigeration unit compressor motor power-off protection system according to claim 1, further comprising an alarm BZ, an intermediate relay KA, a push-button switch normally closed contact SB and an evaporative cold water pump main power circuit;
the main power circuit of the evaporative cold water pump comprises a second three-phase circuit breaker QF3 and an evaporative cold water pump motor M2, and the evaporative cold water pump motor M2 is connected with a first live wire L1, a second live wire L2 and a third live wire L3 of the three-phase alternating-current power supply through the second three-phase circuit breaker QF 3;
one end of the alarm BZ is connected with one end of the normally open contact of the intermediate relay KA, and the other end of the alarm BZ is connected with the zero line N;
one end of the normally open contact of the intermediate relay KA is connected with one end of the coil of the intermediate relay KA, and the other end of the normally open contact of the intermediate relay KA is connected with the third live wire L3 through the normally closed contact SB of the button switch and the second three-phase circuit breaker QF3 in sequence;
one end of the intermediate relay KA coil is connected with the other end of the normally open contact of the motor protector F, and the other end of the intermediate relay KA coil is connected with the zero line N.
4. A power-off protection system for a compressor motor of a refrigerating unit as claimed in claim 2 or 3, wherein the alarm BZ is any one or more of a buzzer alarm, a vibration alarm or a light alarm.
5. The power-off protection system for the motor of the compressor of the refrigerating unit as set forth in claim 4, wherein the type of the buzzer alarm is APT AD16-22 SM.
6. The refrigeration unit compressor motor power-off protection system as claimed in claim 2 or 3 wherein the intermediate relay KA is of the type well RMIA45220 VAC.
7. The power-off protection system for the motor of the compressor of the refrigerating unit as claimed in any one of claims 1 to 3 and 5, wherein the motor protector F is an SM501-2AM smart digital display motor protector.
8. The power-off protection system for compressor motors of refrigeration unit set forth in any one of claims 1 to 3 and 5 wherein said compressor motor M1 is a semi-hermetic screw compressor motor.
9. The refrigeration unit compressor motor power-off protection system as claimed in any one of claims 1 to 3 and 5 wherein the first three-phase circuit breaker QF1 is model LS ABS203b 1175A.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020296930.7U CN211579581U (en) | 2020-03-11 | 2020-03-11 | Power-off protection system for motor of compressor of refrigerating unit |
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| CN202020296930.7U CN211579581U (en) | 2020-03-11 | 2020-03-11 | Power-off protection system for motor of compressor of refrigerating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924860A (en) * | 2021-01-27 | 2021-06-08 | 上汽通用五菱汽车股份有限公司 | High-voltage relay adhesion detection circuit and equipment |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924860A (en) * | 2021-01-27 | 2021-06-08 | 上汽通用五菱汽车股份有限公司 | High-voltage relay adhesion detection circuit and equipment |
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