Crankshaft control method for heat pump compressor
By automatically controlling the compressor crankshaft heating with the auxiliary normally closed contacts of the AC contactor KM1 and the single-phase circuit breaker in a low-temperature environment, the problem of the inability to start the crankshaft preheating function of the low-temperature air source heat pump compressor is solved, and the safe and reliable operation of the compressor at low ring temperature is achieved.
Patent Information
- Application Number
- CN202411642835.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-02-28
AI Technical Summary
The crankshaft of the low-temperature air source heat pump compressor cannot immediately start the preheating function when it is standby or shut down in cold winter, resulting in oil shortage.
By setting the auxiliary normally closed contacts of the AC contactor KM1, it is ensured that the compressor crankshaft heating belt is in the open state under low temperature environment, and automatic control of crankshaft heating is achieved using 220V AC power supply and a single-phase circuit breaker.
It effectively solves the problem that the compressor crankshaft preheating function cannot be started under low temperature environments, ensures that the compressor operates safely and reliably at low ring temperatures, improves heating performance and saves energy.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of commercial heat pump air conditioners, and in particular to a heat pump compressor crankshaft control method. Background Art
[0002] The preheating control of the air conditioning heat pump compressor crankshaft of the existing commercial heat pump air conditioner is realized by a microcomputer controller. However, when the low-temperature air source heat pump unit is in standby or shut down due to a fault, the preheating of the low-temperature air source heat pump compressor crankshaft cannot work. This is because when the low-temperature air source heat pump unit is in standby or shut down due to a fault, the microcomputer controller corresponding to the low-temperature air source heat pump does not have a preheating start function. The microcomputer controller of the low-temperature air source heat pump only has the compressor crankshaft preheating function when the power is on or off. Therefore, in the cold winter, the low-temperature air source heat pump compressor crankshaft preheating function cannot be started immediately when the unit is in standby or shut down due to a fault, which will cause oil shortage. Therefore, it is urgent to develop a new control method for the heat pump compressor crankshaft. Summary of the invention
[0003] In response to the above problems, the present invention provides a heat pump compressor crankshaft control method, which solves the problem of oil shortage and shaft seizure in the operation of the low-temperature air source heat pump unit in winter, ensures the safe and reliable operation of the compressor of the low-temperature air source heat pump unit, and ensures the safe operation of the low-temperature air source heat pump unit.
[0004] A heat pump compressor crankshaft control method, whose technical solution is as follows, includes a compressor, an AC contactor KM1, and a heat pump compressor crankshaft. A 380V three-phase AC power supply leads out a power line that is electrically connected to the compressor through the main contacts of the AC contactor KM1. It is characterized in that: the heat pump compressor crankshaft is provided with a compressor crankshaft heating belt. Any phase and a neutral line of the three-phase AC power supply are led out to form the L line and N line of the 220V AC power supply. One path of the L line led out from the 220V AC power supply passes through the auxiliary normally closed contact of the AC contactor KM1 and is then connected to the compressor crankshaft heating belt. The other path of the L line led out from the 220V AC power supply passes through a single-phase circuit breaker and is connected to the AC contactor KM1 coil. When the AC contactor KM1 coil is energized in an inductive state, the auxiliary normally closed contact is disconnected.
[0005] It is further characterized by:
[0006] When the commercial heat pump air conditioner is powered on, the compressor is powered on, but it may not work. The auxiliary normally closed contact of the AC contactor KM1 is closed, and the compressor crankshaft heating belt starts working immediately.
[0007] The compressor crankshaft heating belt is provided with an L line contact and an N line contact. The N line of the 220V AC power supply and the N line contact of the compressor crankshaft heating belt are always in a connected state. The L line drawn from the 220V AC power supply passes through the auxiliary normally closed contact of the AC contactor KM1 and then is connected to the L line contact of the compressor crankshaft heating belt.
[0008] A temperature sensor is provided at the working environment of the compressor, and a temperature display device fed back by the temperature sensor is placed at a peripheral position of the single-phase circuit breaker, so that the operator who controls the one-way circuit breaker can intuitively obtain the working environment temperature of the compressor;
[0009] When powered on and the ambient temperature is below 0°C, the auxiliary normally closed contact of AC contactor KM1 is normally closed, ensuring that the compressor crankshaft heating belt is in the on state;
[0010] When the power is on and the ambient temperature is below 0°C, the single-phase circuit breaker shall not be turned on unless necessary, so as to ensure that the auxiliary normally closed contact of the AC contactor KM1 is normally closed, so that the compressor crankshaft heating belt is in the on state;
[0011] The one-way circuit breaker is a push button switch, which makes it easy for the operator to operate. When the working environment temperature of the compressor is greater than 0°C, the operator chooses to close or disconnect the single-phase circuit breaker according to the equipment operation conditions, so that the auxiliary normally closed contact of the AC contactor KM1 makes a corresponding open or closed state, so that the compressor crankshaft heating belt is reasonably operated.
[0012] After adopting the present invention, the problem of improper crankshaft preheating temperature setting parameters of the single-chip microcomputer control logic or the PLC control logic is solved; the start or stop of the compressor crankshaft heating belt is realized by the auxiliary normally closed contact of the AC contactor KM1, which solves the problem of shortened compressor life or compressor failure caused by improper setting of the single-chip microcomputer control logic or the PLC control logic parameters. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 A circuit arrangement diagram corresponding to the heat pump compressor crankshaft control method of the present invention;
[0014] The names corresponding to the serial numbers in the figure are as follows:
[0015] Compressor 1, compressor crankshaft heating belt 2, single-phase circuit breaker 3, AC contactor KM1 coil 4, main contact 5, auxiliary normally closed contact 6. DETAILED DESCRIPTION
[0016] A heat pump compressor crankshaft control method, see Figure 1It includes a compressor 1, an AC contactor KM1, and a heat pump compressor crankshaft. The power line of the 380V three-phase AC power supply is electrically connected to the compressor 1 through the main contact 5 of the AC contactor KM1. The heat pump compressor crankshaft is provided with a compressor crankshaft heating belt 2. Any phase and the neutral line of the three-phase AC power supply are led out to form the L line and N line of the 220V AC power supply. The L line led out of the 220V AC power supply passes through the auxiliary normally closed contact 6 of the AC contactor KM1 and is then connected to the compressor crankshaft heating belt 2. The other way of the L line led out of the 220V AC power supply passes through the single-phase circuit breaker 3 and is connected to the AC contactor KM1 coil 4. When the AC contactor KM1 coil 4 is energized in the induction state, the auxiliary normally closed contact 6 is disconnected.
[0017] When the commercial heat pump air conditioner is powered on, compressor 1 is powered on, but compressor 1 may not be working. The auxiliary normally closed contact 6 of AC contactor KM1 is closed, and the compressor crankshaft heating belt 2 starts working immediately.
[0018] In specific implementation, the compressor crankshaft heating belt 2 is provided with an L line contact and an N line contact. The N line of the 220V AC power supply and the N line contact of the compressor crankshaft heating belt 2 are always in a connected state. The L line drawn from the 220V AC power supply passes through the auxiliary normally closed contact of the AC contactor KM1 and then is connected to the L line contact of the compressor crankshaft heating belt 2.
[0019] A temperature sensor is provided at the working environment of the compressor 1, and a temperature display device fed back by the temperature sensor is placed at a peripheral position of the single-phase circuit breaker 3, which enables the operator who controls the one-way circuit breaker 3 to intuitively obtain the working environment temperature of the compressor;
[0020] When powered on and the ambient temperature is below 0°C, the auxiliary normally closed contact 6 of the AC contactor KM1 is normally closed, ensuring that the compressor crankshaft heating belt 2 is in the on state;
[0021] When powered on and when the ambient temperature is below 0°C, the single-phase circuit breaker 3 shall not be connected unless necessary, thereby ensuring that the auxiliary normally closed contact 6 of the AC contactor KM1 is normally closed, so that the compressor crankshaft heating belt 2 is in the on state, the heat pump compressor operates under low ambient temperature, and the bottom surface temperature of the compressor 1 is maintained above 0°C, which can effectively improve the heating performance of the compressor and has obvious energy-saving effects.
[0022] In specific implementation, the one-way circuit breaker 3 is a button switch, which makes the operator's operation simple. When the working environment temperature of the compressor 1 is greater than 0°C, the operator chooses to close or disconnect the single-phase circuit breaker 3 according to the equipment operation status, so that the auxiliary normally closed contact 6 of the AC contactor KM1 makes a corresponding open or closed state, so that the compressor crankshaft heating belt is reasonably operated.
[0023] It solves the problem of improper crankshaft preheating temperature setting parameters of the single-chip microcomputer control logic or the PLC control logic; it realizes the start or shut down of the compressor crankshaft heating belt through the auxiliary normally closed contact of the AC contactor KM1, and solves the problem of shortened compressor life or compressor failure caused by improper setting of the single-chip microcomputer control logic or the PLC control logic parameters; when the power is on, the one-way circuit breaker 3 is in the open state, the auxiliary normally closed contact 6 of the AC contactor KM1 is normally closed, and the compressor crankshaft heating belt 2 is in the open state; when the power is on, the working environment temperature of the compressor 1 is appropriate, the one-way circuit breaker 3 is in the closed state, the auxiliary normally closed contact 6 of the AC contactor KM1 is opened, and the compressor crankshaft heating belt 2 is in the closed state.
[0024] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0025] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A heat pump compressor crankshaft control method, comprising a compressor, an AC contactor KM1, and a heat pump compressor crankshaft, wherein a 380V three-phase AC power supply leads to a power line electrically connected to the compressor through the main contact of the AC contactor KM1, characterized in that: The heat pump compressor crankshaft is provided with a compressor crankshaft heating zone. Any phase and the neutral line of the three-phase AC power supply are led out to form the L line and N line of the 220V AC power supply. The L line led out of the 220V AC power supply passes through the auxiliary normally closed contact of the AC contactor KM1 and then connected to the compressor crankshaft heating zone. The other path of the L line led out of the 220V AC power supply passes through the single-phase circuit breaker and is connected to the AC contactor KM1 coil. When the AC contactor KM1 coil is energized in the induction state, the auxiliary normally closed contact is disconnected.
2. A heat pump compressor crankshaft control method according to claim 1, characterized in that: When the commercial heat pump air conditioner is powered on and started, the compressor is powered on, but the compressor may not be working. The auxiliary normally closed contact of the AC contactor KM1 is closed, and the compressor crankshaft heating belt starts working immediately.
3. A heat pump compressor crankshaft control method according to claim 2, characterized in that: The compressor crankshaft heating belt is provided with an L line contact and an N line contact. The N line of the 220V AC power supply and the N line contact of the compressor crankshaft heating belt are always in a connected state. The L line led out from the 220V AC power supply passes through the auxiliary normally closed contact of the AC contactor KM1 and then connected to the L line contact of the compressor crankshaft heating belt.
4. A heat pump compressor crankshaft control method according to claim 1, characterized in that: A temperature sensor is provided at the working environment of the compressor, and a temperature display device fed back by the temperature sensor is placed at a peripheral position of the single-phase circuit breaker, which enables an operator who controls the one-way circuit breaker to intuitively obtain the working environment temperature of the compressor.
5. A heat pump compressor crankshaft control method according to claim 4, characterized in that: When powered on and the ambient temperature is below 0°C, the auxiliary normally closed contact of AC contactor KM1 is normally closed, ensuring that the compressor crankshaft heating belt is in the on state.
6. A heat pump compressor crankshaft control method according to claim 5, characterized in that: When the power is on and the ambient temperature is below 0°C, the single-phase circuit breaker must not be connected unless necessary, so as to ensure that the auxiliary normally closed contact of the AC contactor KM1 is normally closed, so that the compressor crankshaft heating belt is in the on state.
7. A heat pump compressor crankshaft control method according to claim 6, characterized in that: The one-way circuit breaker is a push button switch, which makes it easy for the operator to operate. When the working environment temperature of the compressor is greater than 0°C, the operator chooses to close or disconnect the single-phase circuit breaker according to the equipment operation conditions, so that the auxiliary normally closed contact of the AC contactor KM1 makes a corresponding open or closed state, so that the compressor crankshaft heating belt is reasonably operated.