CN210718240U - Heat pump set and control circuit thereof - Google Patents
Heat pump set and control circuit thereof Download PDFInfo
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- CN210718240U CN210718240U CN201921593417.8U CN201921593417U CN210718240U CN 210718240 U CN210718240 U CN 210718240U CN 201921593417 U CN201921593417 U CN 201921593417U CN 210718240 U CN210718240 U CN 210718240U
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Abstract
The utility model relates to a heat pump unit and a control circuit thereof, belonging to the technical field of heat pumps; the heat pump unit and the heat pump unit control circuit are high in reliability and good in economy; the technical scheme is as follows: the three-phase power supply system comprises a main loop, a delay startup circuit and a delay shutdown circuit, wherein in the main loop, a three-phase power supply sequentially passes through a first circuit breaker QS1 and a third circuit breaker QS3 and then is connected with a first winding of a compressor motor M through a main contact of a first contactor KM1, and the third circuit breaker QS3 is also connected with a second winding of the compressor motor M through a main contact of a second contactor KM 2; a second circuit breaker QS2 is disposed between the first circuit breaker QS1 and the third circuit breaker QS3, and the second circuit breaker QS2 is connected to the control transformer BK; the utility model discloses but wide application in cooling, heat supply field.
Description
Technical Field
The utility model relates to a heat pump set and control circuit thereof belongs to heat pump technical field.
Background
Heat pumps play an important role in saving energy. The heat pump functions to extract heat from the ambient environment and transfer it to the object being heated. The heat pump unit must be provided with a set of automatic protection device corresponding to the heat pump unit, so that the equipment works within a safe condition range, and the normal and reliable work of the whole system is ensured. The existing heat pump control system is usually realized by a control panel with a single chip microcomputer or a PLC (programmable logic controller), but the cost of the PLC is higher, while the control panel of the single chip microcomputer is low in cost, certain risks exist in the aspect of anti-electromagnetic interference, the control panel is easily interfered under extreme conditions, the operation program of the single chip microcomputer can make mistakes, and the normal operation of the heat pump control system is directly influenced.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a heat pump set and control circuit thereof has overcome the not enough of prior art existence, provides a heat pump set and control circuit that reliability is high, economic nature is good.
In order to solve the technical problem, the utility model discloses a technical scheme be: a heat pump unit control circuit comprises a main loop, a delay startup circuit and a delay shutdown circuit, wherein in the main loop, a three-phase power supply sequentially passes through a first circuit breaker QS1 and a third circuit breaker QS3 and then is connected with a first winding of a compressor motor M through a main contact of a first contactor KM1, and a third circuit breaker QS3 is also connected with a second winding of the compressor motor M through a main contact of a second contactor KM 2; a second circuit breaker QS2 is disposed between the first circuit breaker QS1 and the third circuit breaker QS3, and the second circuit breaker QS2 is connected to the control transformer BK;
the delayed starting circuit is used for starting the liquid supply electromagnetic valve in a delayed way after two windings of the compressor motor M are electrified; the time-delay shutdown circuit is used for closing the liquid supply electromagnetic valve in a time-delay way after the two windings of the compressor motor M are powered off.
Preferably, in the delayed starting circuit, a second normally open contact of the first time relay KT1 and a coil of the second time relay KT2 are connected in series at two ends of a power supply, and a coil of the first contactor KM1 is connected in parallel at two ends of a coil of the second time relay KT 2; the normally open contact of the first contactor KM1 and the coil of the fourth time relay KT4 are connected in series at two ends of a power supply; the normally open contact of a fourth time relay KT4 and the coil of the second contactor KM2 are connected in series at two ends of a power supply; the normally open contact of the second time relay KT2, the normally closed contact of the first relay KA1 and the coil J1 of the liquid supply electromagnetic valve are connected in series at two ends of a power supply;
in the time-delay shutdown circuit, a normally closed contact of a knob SF1 and a coil of a first relay KA1 are connected in series at two ends of a power supply, and a coil of a third time relay KT3 is connected in parallel with a coil of a first relay KA 1;
the normally open contact of knob SF1, the coil of first time relay KT1 and the normally closed contact of third time relay KT3 are connected in series at the both ends of power, and the first normally open contact of first time relay KT1 is parallelly connected at the both ends of the normally open contact of knob SF 1.
The normally open contact of the second contactor KM2 is connected in series with the first indicator light HG1 at both ends of the power supply, and the second indicator light HW1 is connected in series at both ends of the power supply.
Preferably, the motor protection circuit further comprises a motor protection circuit, wherein a main contact of a phase sequence protection relay XX is connected with a three-phase power supply, a main contact of a first thermal relay KH1 is arranged between a first winding of the compressor motor M and a main contact of the first contactor KM1, a main contact of a second thermal relay KH2 is arranged between a second winding of the compressor motor M and a main contact of the second contactor KM2, a normally open contact of the first thermal relay KH1, coils of a first button SB1 and a second relay KA2 are connected in series at two ends of the power supply, the normally open contact of the phase sequence protection relay XX, the normally open contact of the second relay KA2 and the normally open contact of the second thermal relay KH2 are connected in parallel at two ends of the normally open contact of the first thermal relay KH1, and the normally open contact of the second thermal relay KH2 and a third indicator HY1 are connected in series at two ends of the power supply;
the normally closed contact of the second relay KA2 and the normally closed contact of the phase sequence protection relay XX are connected in series between the normally open contact of the knob SF1 and the coil of the first time relay KT 1.
Preferably, the oil pressure protection circuit of the compressor is further included, in the oil pressure protection circuit of the compressor, a normally open contact of the electronic oil pressure difference switch SP1, coils of the second button SB2 and a fifth time relay KT5 are connected in series at two ends of a power supply, a normally open contact of the fifth time relay KT5 is connected in parallel at two ends of the normally open contact of the electronic oil pressure difference switch SP1, and a fourth indicator light HY2 and a normally open contact of the fifth time relay KT5 are connected in series at two ends of the power supply;
the normally closed contact of the fifth time relay KT5 is connected in series between the rotary knob SF1 and the coil of the first time relay KT 1.
Preferably, the refrigerant pressure protection circuit is further included, wherein coils of a high-pressure switch SP2, a third button SB3 and a third relay KA3 are connected in series at two ends of the power supply, a normally open contact of the third relay KA3 is connected in parallel at two ends of the high-pressure switch SP2, a normally open contact of a third relay KA3 and a fifth indicator light HY3 are connected in series at two ends of the power supply, coils of a low-pressure switch SP3, a fourth button SB4 and a sixth time relay KT6 are connected in series at two ends of the power supply, a normally open contact of a sixth time relay KT6 is connected in parallel at two ends of the low-pressure switch SP3, and a normally open contact of the sixth time relay KT6 and a sixth indicator light HY4 are connected in series at two ends of the power supply;
the normally closed contact of the third relay KA3 and the normally closed contact of the sixth time relay KT6 are connected in series between the rotary knob SF1 and the coil of the first time relay KT 1.
Preferably, the water outlet temperature protection circuit is further included, in the water outlet temperature protection circuit, a normally open contact of the high-temperature switch ST1, a coil of the fifth button SB5 and a coil of the fourth relay KA4 are connected in series at two ends of the power supply, a normally open contact of the low-temperature switch ST2 and a normally open contact of the fourth relay KA4 are connected in parallel at two ends of the high-temperature switch ST1, and a normally open contact of the fourth relay KA4 and the seventh indicator light HY5 are connected in series at two sides of the power supply;
the normally closed contact of the high temperature switch ST1 and the normally closed contact of the low temperature switch ST2 are connected in series between the normally open contact of the knob SF1 and the coil of the first time relay KT 1.
A heat pump unit comprises a compressor, a condenser, a liquid supply electromagnetic valve, an expansion valve and an evaporator which are sequentially connected by a working medium pipeline; still include heat pump set control circuit, heat pump set control circuit is foretell heat pump set control circuit.
A heat pump unit control method is completed based on the heat pump unit and comprises the following steps:
after the heat pump unit is electrified, waiting for at least 3 minutes for electrifying the first winding of the compressor motor M, and after 0.1-3 seconds, electrifying the second winding of the compressor motor M, and starting the compressor;
after the compressor is started, waiting for 2-5 seconds, and opening the liquid supply electromagnetic valve;
judging whether the current winding current of the compressor motor M is overloaded or not, if so, disconnecting the main contact of the thermal relay to stop the compressor, and closing the liquid supply electromagnetic valve;
judging whether the current three-phase power supply has phase loss and phase inversion, if so, actuating a phase sequence protection relay XX to stop the compressor and close the liquid supply electromagnetic valve;
judging whether the oil pressure difference of the current compressor is lower than a set rated value or not, if the oil pressure difference of the current compressor is lower than the set rated value and lasts for 1-3 seconds, closing an electronic oil pressure difference switch SP1 to stop the compressor, and closing a liquid supply electromagnetic valve;
judging whether the pressure of the exhaust pipe of the current compressor is higher than a set high-pressure value or not, if so, closing a high-pressure switch SP2 to stop the compressor and closing a liquid supply electromagnetic valve;
judging whether the pressure of the air suction pipe of the current compressor is lower than a set low pressure value or not, if the pressure of the air suction pipe of the current compressor is lower than the set low pressure value and lasts for 8-28 seconds, closing a low pressure switch SP3 to stop the compressor, and closing a liquid supply electromagnetic valve;
judging whether the temperature of the water outlet of the current condenser is higher than the set highest temperature or not, if so, closing a normally open contact of a high-temperature switch ST1 to stop the compressor and closing a liquid supply electromagnetic valve;
judging whether the temperature of the water outlet of the current evaporator is lower than the set lowest temperature or not, if so, closing a normally open contact of a low-temperature switch ST2 to stop the compressor and closing a liquid supply electromagnetic valve;
after the heat pump unit is powered off, the liquid supply electromagnetic valve is closed, and after 2-5 seconds, the compressor is stopped.
Compared with the prior art, the utility model following beneficial effect has.
The utility model discloses a low pressure control electrical apparatus and low pressure protection electrical apparatus realize the high low temperature protection of time delay start, time delay shutdown, overload protection, the phase failure reverse phase protection, compressor oil pressure differential protection, the high low pressure protection of refrigerant and delivery port to heat pump set, reliable and stable, long service life, it is energy-conserving effectual.
Drawings
Fig. 1 is a structural diagram of a heat pump unit provided by an embodiment of the present invention.
Fig. 2 is an electrical schematic diagram of a main circuit according to an embodiment of the present invention.
Fig. 3 is an electrical schematic diagram of a control circuit according to an embodiment of the present invention.
Fig. 4 is a schematic view of a control panel according to an embodiment of the present invention.
In the figure, 1-compressor, 2-condenser, 3-liquid supply electromagnetic valve, 4-expansion valve, 5-evaporator, 6-water source and 7-water pump.
Detailed Description
As shown in fig. 2 and fig. 3, the embodiment of the present invention provides a heat pump unit control circuit, including a main loop, a delay power-on circuit, a delay power-off circuit, a motor protection circuit, a compressor oil pressure protection circuit, a refrigerant pressure protection circuit and a water outlet temperature protection circuit, wherein in the main loop, a three-phase power supply is connected to a first winding of a compressor motor M through a main contact of a first contactor KM1 after sequentially passing through a first circuit breaker QS1 and a third circuit breaker QS3, and the third circuit breaker QS3 is also connected to a second winding of the compressor motor M through a main contact of a second contactor KM 2; a second circuit breaker QS2 is disposed between the first circuit breaker QS1 and the third circuit breaker QS3, and the second circuit breaker QS2 is connected to the control transformer BK;
the delayed starting circuit is used for starting the liquid supply electromagnetic valve in a delayed way after two windings of the compressor motor M are electrified; the time-delay shutdown circuit is used for closing the liquid supply electromagnetic valve in a time-delay way after the two windings of the compressor motor M are powered off.
In the delayed starting circuit, a second normally open contact of a first time relay KT1 and a coil of a second time relay KT2 are connected in series at two ends of a power supply, and a coil of a first contactor KM1 is connected in parallel at two ends of a coil of the second time relay KT 2; the normally open contact of the first contactor KM1 and the coil of the fourth time relay KT4 are connected in series at two ends of a power supply; the normally open contact of the fourth time relay KT4 and the coil of the second contactor KM2 are connected in series at two ends of a power supply; the normally open contact of the second time relay KT2, the normally closed contact of the first relay KA1 and the coil J1 of the liquid supply electromagnetic valve are connected in series at two ends of a power supply;
in the time-delay shutdown circuit, a normally closed contact of a knob SF1 and a coil of a first relay KA1 are connected in series at two ends of a power supply, and a coil of a third time relay KT3 is connected in parallel with a coil of a first relay KA 1;
the normally open contact of knob SF1, the coil of first time relay KT1 and the normally closed contact of third time relay KT3 are connected in series at the both ends of power, and the first normally open contact of first time relay KT1 is parallelly connected at the both ends of the normally open contact of knob SF 1.
The normally open contact of the second contactor KM2 is connected in series with the first indicator light HG1 across the power supply, and the second indicator light HW1 across the power supply.
In the motor protection circuit, a main contact of a phase sequence protection relay XX is connected with a three-phase power supply, a main contact of a first thermal relay KH1 is arranged between a first winding of a compressor motor M and a main contact of a first contactor KM1, a main contact of a second thermal relay KH2 is arranged between a second winding of the compressor motor M and a main contact of a second contactor KM2, normally open contacts of the first thermal relay KH1, coils of a first button SB1 and a second relay KA2 are connected in series at two ends of the power supply, normally open contacts of the phase sequence protection relay XX, a second relay KA2 and a second thermal relay KH2 are connected in parallel at two ends of the normally open contacts of the first thermal relay KH1, and the normally open contacts of the second thermal relay KH2 and a third indicator lamp 1 are connected in series at two ends of the power supply HY;
the normally closed contact of the second relay KA2 and the normally closed contact of the phase sequence protection relay XX are connected in series between the normally open contact of the knob SF1 and the coil of the first time relay KT 1.
In the oil pressure protection circuit of the compressor, a normally open contact of an electronic oil pressure difference switch SP1, a coil of a second button SB2 and a coil of a fifth time relay KT5 are connected in series at two ends of a power supply, a normally open contact of the fifth time relay KT5 is connected in parallel at two ends of a normally open contact of the electronic oil pressure difference switch SP1, and a fourth indicator light HY2 and the normally open contact of the fifth time relay KT5 are connected in series at two ends of the power supply;
the normally closed contact of the fifth time relay KT5 is connected in series between the rotary knob SF1 and the coil of the first time relay KT 1.
In the refrigerant pressure protection circuit, coils of a high-pressure switch SP2, a third button SB3 and a third relay KA3 are connected in series at two ends of a power supply, a normally open contact of the third relay KA3 is connected in parallel at two ends of the high-pressure switch SP2, a normally open contact of a third relay KA3 and a fifth indicator light HY3 are connected in series at two ends of the power supply, coils of a low-pressure switch SP3, a fourth button SB4 and a sixth time relay KT6 are connected in series at two ends of the power supply, a normally open contact of a sixth time relay KT6 is connected in parallel at two ends of a low-pressure switch SP3, and a normally open contact of the sixth time relay KT6 and a sixth indicator light HY4 are connected in series at two ends of the power supply;
the normally closed contact of the third relay KA3 and the normally closed contact of the sixth time relay KT6 are connected in series between the knob SF1 and the coil of the first time relay KT 1.
In the outlet water temperature protection circuit, a normally open contact of a high-temperature switch ST1, a coil of a fifth button SB5 and a coil of a fourth relay KA4 are connected in series at two ends of a power supply, a normally open contact of a low-temperature switch ST2 and a normally open contact of a fourth relay KA4 are connected in parallel at two ends of a high-temperature switch ST1, and a normally open contact of a fourth relay KA4 and a seventh indicator light HY5 are connected in series at two sides of the power supply;
the normally closed contact of the high temperature switch ST1 and the normally closed contact of the low temperature switch ST2 are connected in series between the normally open contact of the knob SF1 and the coil of the first time relay KT 1.
As shown in fig. 1, a heat pump unit comprises a compressor 1, a condenser 2, a liquid supply electromagnetic valve 3, an expansion valve 4 and an evaporator 5 which are sequentially connected by a working medium pipeline; still include heat pump set control circuit, heat pump set control circuit is foretell heat pump set control circuit.
A heat pump unit control method is completed based on the heat pump unit and comprises the following steps:
after the heat pump unit is electrified, waiting for at least 3 minutes for electrifying the first winding of the compressor motor M, and after 0.1-3 seconds, electrifying the second winding of the compressor motor M, and starting the compressor;
after the compressor is started, waiting for 2-5 seconds, and opening the liquid supply electromagnetic valve 3;
judging whether the current winding current of the compressor motor M is overloaded or not, if so, disconnecting the main contact of the thermal relay to stop the compressor 1, and closing the liquid supply electromagnetic valve 3;
judging whether the current three-phase power supply has phase loss and phase inversion, if the current three-phase power supply has phase loss and phase inversion, actuating a phase sequence protection relay XX to stop the compressor 1 and close the liquid supply electromagnetic valve 3;
judging whether the oil pressure difference of the current compressor 1 is lower than a set rated value or not, if the oil pressure difference of the current compressor 1 is lower than the set rated value and lasts for 1-3 seconds, closing an electronic oil pressure difference switch SP1 to stop the compressor 1 and closing a liquid supply electromagnetic valve 3;
judging whether the pressure of the exhaust pipe of the current compressor 1 is higher than a set high-pressure value or not, if so, closing a high-pressure switch SP2 to stop the compressor 1 and close the liquid supply electromagnetic valve 3;
judging whether the pressure of the air suction pipe of the compressor 1 is lower than a set low pressure value or not, if the pressure of the air suction pipe of the compressor 1 is lower than the set low pressure value and lasts for 8-28 seconds, closing a low pressure switch SP3 to stop the compressor 1 and closing a liquid supply electromagnetic valve 3;
judging whether the temperature of the water outlet of the current condenser 2 is higher than the set highest temperature or not, if so, closing a normally open contact of a high-temperature switch ST1 to stop the compressor 1 and close the liquid supply electromagnetic valve 3;
judging whether the temperature of the water outlet of the evaporator 5 is lower than the set lowest temperature or not, if the temperature of the water outlet of the evaporator 5 is lower than the set low temperature, closing a normally open contact of a low temperature switch ST2 to stop the compressor 1, and closing the liquid supply electromagnetic valve 3;
after the heat pump unit is powered off, the liquid supply electromagnetic valve 3 is closed, and after 2-5 seconds, the compressor 1 is stopped.
To the working process and principle of the utility model further explain:
in specific implementation, as shown in fig. 4, the second button SB2 and the fourth indicator light HY2, the third button SB3 and the fifth indicator light HY3, the first button SB1 and the third indicator light HY1, the fourth button SB4 and the sixth indicator light HY4, and the fifth button SB5 and the seventh indicator light HY5 are all self-resetting buttons with lights. The high pressure switch SP2 and the low pressure switch SP1 are integrated high and low pressure controllers. The time delay duration set by the first time relay KT1 is 3 minutes, the time delay duration set by the second time relay KT2 is 4 seconds, the time delay duration set by the third time relay KT3 is 2 seconds, the time delay duration set by the fourth time relay KT4 is 0.5 seconds, the time delay duration set by the fifth time relay KT4 is 2 seconds, and the time delay duration set by the sixth time relay KT6 is 10 seconds.
When the heat pump unit is started, a first circuit breaker QS1, a second circuit breaker QS2 and a third circuit breaker QS3 are closed, at the moment, a second indicator light HW1 is lightened, a knob SF1 rotates to an open position, a coil of a first time relay KT1 is electrified and self-locked, KT1 is delayed, a first contactor KM1 is attracted, a first winding is electrified and operated, a coil of a relay KT4 is electrified, KT4 is delayed, a second contactor KM2 is attracted, a second winding is electrified and operated, the compressor 1 is started completely, and a first indicator light HG1 is lightened; when the coil of the first contactor KM1 is electrified, the coil of the second time relay KT2 is electrified, KT2 delays, the actuator J1 of the liquid supply electromagnetic valve 3 is electrified, the liquid supply electromagnetic valve 3 is conducted, and the normal working state is achieved.
When the heat pump unit is shut down, the knob SF1 is rotated to the closed position, the normally closed contact of the first relay KA1 is disconnected, the actuator J1 of the liquid supply electromagnetic valve 3 is powered off, and the liquid supply electromagnetic valve 3 is closed. The coil of third time relay KT3 is electrified, KT3 time delay, and KT 3's normally closed contact disconnection, then time relay KT 1's coil falls the power failure, then first time relay KT 1's normally open contact disconnection, then disconnection contactor KM1 and KM2, the compressor is shut down.
Overload protection: when the abnormal condition or circuit abnormality of the heat pump unit causes the compressor motor M to be overloaded, the heat element of the first thermal relay KH1 or the second thermal relay KH2 is disconnected to stop the compressor motor M in the main loop, the normally open contact of the first thermal relay KH1 or the second thermal relay KH2 is closed in the control loop, and the third indicator light HY1 is lightened.
Phase loss and reverse phase protection: in order to avoid that the three-phase power supply of the motor has one phase less, a phase sequence protection relay XX is arranged on the main loop. When taking place open-phase or when the reverse phase, in control circuit, the normally closed contact disconnection of phase sequence protection relay XX, the coil of first time relay KT1 loses electricity, disconnection contactor KM1 and KM2 then, the compressor is shut down, and the normally open contact of phase sequence protection relay XX is closed, and second relay KA2 gets electricity, and the normally open contact of second relay KA2 is closed, and third pilot lamp HY1 lights.
When overload or phase loss and reverse phase occur, after the fault is eliminated, the first button SB1 is pressed, the coil of the second relay KA2 loses power, and the third indicator light HY1 is turned off.
Compressor oil pressure differential protection: when the oil pressure difference of the lubricating oil in the compressor is lower than the oil pressure difference of safe operation of the compressor, the electronic oil pressure difference switch SP1 is closed, the coil of the fifth time relay KT5 is powered on, KT5 starts timing, the oil pressure difference of the compressor does not recover to a normal state in preset time, then the normally open contact of the fifth time relay KT5 is closed, the fourth indicator light HY2 is turned on, the normally closed contact of the fifth time relay KT5 is disconnected, the coil of the first time relay KT1 is powered off, then the contactors KM1 and KM2 are disconnected, and the compressor is stopped. After the fault is cleared, the second button SB2 is pressed, the fifth time relay KT5 is powered off, and the fourth indicator light HY2 is turned off.
Refrigerant high-pressure protection: when the pressure of the refrigerant at the air outlet of the compressor is higher than a set high-pressure value, the high-pressure switch SP2 is closed, the coil of the third relay KA3 is electrified, the normally open contact of the third relay KA3 is closed, the fifth indicator lamp HY3 is lightened, the normally closed contact of the third relay KA3 is disconnected, the coil of the first time relay KT1 is powered off, then the contactors KM1 and KM2 are disconnected, and the compressor is stopped. After the refrigerant pressure returns to normal, the third button SB3 is pressed, the coil of the third relay KA3 is de-energized, and the fifth indicator light HY3 is turned off.
Refrigerant high-low protection: when the pressure of the refrigerant at the air outlet of the compressor is lower than a set low-pressure value, a low-pressure switch SP3 is closed, a coil of a sixth time relay KT6 is powered on, if the low pressure of the refrigerant is not recovered to be normal within the set time, a normally open contact of the sixth time relay KT6 is closed, a sixth indicator lamp HY4 is lightened, a normally closed contact of the sixth time relay KT6 is disconnected, a coil of a first time relay KT1 is powered off, then contactors KM1 and KM2 are disconnected, and the compressor is stopped. When the refrigerant pressure returns to normal, the fourth button SB4 is pressed, the coil of the sixth time relay KT6 is de-energized, and the sixth indicator light HY4 is turned off.
High-temperature protection of a water outlet: when the temperature of the water outlet of the condenser is higher than a high-temperature alarm value set by a high-temperature switch ST1, the coil of the fourth relay KA4 is powered on, the normally open contact of the fourth KA4 is closed, the seventh indicator lamp HY5 is lightened, the normally closed contact of the fourth relay KA4 is disconnected, the coil of the first time relay KT1 is powered off, then the contactors KM1 and KM2 are disconnected, and the compressor is stopped. When the temperature of the water outlet is lower than the set high-temperature alarm value, the fifth button SB5 is pressed, the coil of the fourth relay KA4 loses power, and the seventh indicator light HY5 is turned off.
Low-temperature protection of a water outlet: when the temperature of the water outlet of the condenser is lower than a low-temperature alarm value set by a low-temperature switch ST2, the coil of the fourth relay KA4 is powered on, the normally open contact of the fourth relay KA4 is closed, the seventh indicator lamp HY5 is lightened, the normally closed contact of the fourth time relay KA4 is disconnected, the coil of the first time relay KT1 is powered off, then the contactors KM1 and KM2 are disconnected, and the compressor is stopped. When the temperature of the water outlet is higher than the set low-temperature alarm value, the fifth button SB5 is pressed, the fourth relay KA4 loses power, and the seventh indicator light HY5 is turned off.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. A heat pump set control circuit, its characterized in that: the three-phase power supply system comprises a main loop, a delay startup circuit and a delay shutdown circuit, wherein in the main loop, a three-phase power supply sequentially passes through a first circuit breaker QS1 and a third circuit breaker QS3 and then is connected with a first winding of a compressor motor M through a main contact of a first contactor KM1, and the third circuit breaker QS3 is also connected with a second winding of the compressor motor M through a main contact of a second contactor KM 2; a second circuit breaker QS2 is disposed between the first circuit breaker QS1 and the third circuit breaker QS3, and the second circuit breaker QS2 is connected to the control transformer BK;
the delayed starting circuit is used for starting the liquid supply electromagnetic valve in a delayed way after two windings of the compressor motor M are electrified; the time-delay shutdown circuit is used for closing the liquid supply electromagnetic valve in a time-delay way after the two windings of the compressor motor M are powered off.
2. The heat pump unit control circuit of claim 1, wherein: in the time-delay starting circuit, a second normally-open contact of a first time relay KT1 and a coil of a second time relay KT2 are connected in series at two ends of a power supply, and a coil of a first contactor KM1 is connected in parallel at two ends of a coil of the second time relay KT 2; the normally open contact of the first contactor KM1 and the coil of the fourth time relay KT4 are connected in series at two ends of a power supply; the normally open contact of a fourth time relay KT4 and the coil of the second contactor KM2 are connected in series at two ends of a power supply; the normally open contact of the second time relay KT2, the normally closed contact of the first relay KA1 and the coil J1 of the liquid supply electromagnetic valve are connected in series at two ends of a power supply;
in the time-delay shutdown circuit, a normally closed contact of a knob SF1 and a coil of a first relay KA1 are connected in series at two ends of a power supply, and a coil of a third time relay KT3 is connected in parallel with a coil of a first relay KA 1;
a normally open contact of the knob SF1, a coil of the first time relay KT1 and a normally closed contact of the third time relay KT3 are connected in series at two ends of a power supply, and a first normally open contact of the first time relay KT1 is connected in parallel at two ends of the normally open contact of the knob SF 1;
the normally open contact of the second contactor KM2 is connected in series with the first indicator light HG1 at both ends of the power supply, and the second indicator light HW1 is connected in series at both ends of the power supply.
3. The heat pump unit control circuit of claim 2, wherein: the motor protection circuit is characterized by further comprising a motor protection circuit, wherein a main contact of a phase sequence protection relay XX is connected with a three-phase power supply, a main contact of a first thermal relay KH1 is arranged between a first winding of the compressor motor M and a main contact of a first contactor KM1, a main contact of a second thermal relay KH2 is arranged between a second winding of the compressor motor M and a main contact of a second contactor KM2, normally open contacts of the first thermal relay KH1, coils of a first button SB1 and a second relay KA2 are connected in series at two ends of the power supply, normally open contacts of a phase sequence protection relay XX, a second relay KA2 and a second thermal relay KH2 are connected in parallel at two ends of the normally open contacts of the first thermal relay KH1, and normally open contacts of the second thermal relay KH2 and a third indicator light HY1 are connected in series at two ends of the power supply;
the normally closed contact of the second relay KA2 and the normally closed contact of the phase sequence protection relay XX are connected in series between the normally open contact of the knob SF1 and the coil of the first time relay KT 1.
4. A heat pump unit control circuit according to claim 3, wherein: the oil pressure protection circuit of the compressor is characterized by further comprising a compressor oil pressure protection circuit, wherein a normally open contact of an electronic oil pressure difference switch SP1, coils of a second button SB2 and a fifth time relay KT5 are connected at two ends of a power supply in series, a normally open contact of the fifth time relay KT5 is connected at two ends of a normally open contact of an electronic oil pressure difference switch SP1 in parallel, and a fourth indicator light HY2 and a normally open contact of the fifth time relay KT5 are connected at two ends of the power supply in series;
the normally closed contact of the fifth time relay KT5 is connected in series between the rotary knob SF1 and the coil of the first time relay KT 1.
5. The heat pump unit control circuit of claim 4, wherein: the refrigerant pressure protection circuit is characterized by further comprising a refrigerant pressure protection circuit, wherein coils of a high-pressure switch SP2, a third button SB3 and a third relay KA3 are connected in series at two ends of a power supply, a normally open contact of the third relay KA3 is connected in parallel at two ends of the high-pressure switch SP2, a normally open contact of a third relay KA3 and a fifth indicator light HY3 are connected in series at two ends of the power supply, coils of a low-pressure switch SP3, a fourth button SB4 and a sixth time relay KT6 are connected in series at two ends of the power supply, a normally open contact of the sixth time relay KT6 is connected in parallel at two ends of the low-pressure switch SP3, and a normally open contact of the sixth time relay KT6 and a sixth indicator light HY4 are connected in series at two ends of;
the normally closed contact of the third relay KA3 and the normally closed contact of the sixth time relay KT6 are connected in series between the rotary knob SF1 and the coil of the first time relay KT 1.
6. The heat pump unit control circuit of claim 5, wherein: the water outlet temperature protection circuit is characterized by further comprising a water outlet temperature protection circuit, wherein a normally open contact of a high-temperature switch ST1, a coil of a fifth button SB5 and a coil of a fourth relay KA4 are connected in series at two ends of a power supply, a normally open contact of a low-temperature switch ST2 and a normally open contact of a fourth relay KA4 are connected in parallel at two ends of a high-temperature switch ST1, and a normally open contact of a fourth relay KA4 and a seventh indicator light HY5 are connected in series at two sides of the power supply;
the normally closed contact of the high temperature switch ST1 and the normally closed contact of the low temperature switch ST2 are connected in series between the normally open contact of the knob SF1 and the coil of the first time relay KT 1.
7. A heat pump unit, its characterized in that: comprises a compressor (1), a condenser (2), a liquid supply electromagnetic valve (3), an expansion valve (4) and an evaporator (5) which are sequentially connected by a working medium pipeline; the heat pump unit control circuit is the heat pump unit control circuit of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921593417.8U CN210718240U (en) | 2019-09-24 | 2019-09-24 | Heat pump set and control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921593417.8U CN210718240U (en) | 2019-09-24 | 2019-09-24 | Heat pump set and control circuit thereof |
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| Publication Number | Publication Date |
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| CN210718240U true CN210718240U (en) | 2020-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595125A (en) * | 2019-09-24 | 2019-12-20 | 深圳市辉宏技术有限公司 | Heat pump unit, heat pump unit control circuit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595125A (en) * | 2019-09-24 | 2019-12-20 | 深圳市辉宏技术有限公司 | Heat pump unit, heat pump unit control circuit and method |
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