A wide temperature range air source heat pump compressor fault diagnosis device

Abstract

The utility model discloses a wide temperature range air source heat pump compressor fault diagnosis device, the fault diagnosis device comprises a gas engine and a compressor, the gas engine is connected to the compressor, a high-pressure pressure sensor is connected to the pipeline at the compressor output end, a low-pressure pressure sensor is connected to the pipeline at the compressor input end, an electromagnetic clutch is arranged in the compressor, a first voltage measuring device is connected to both ends of the electromagnetic clutch, an intermediate relay or a contactor is connected to the negative / positive channel of the electromagnetic clutch, a switch contact of the intermediate relay or the contactor is connected to the negative / positive pole of a direct current power supply, the positive / negative pole of the direct current power supply is connected to the positive / negative pole of the electromagnetic clutch, the positive / negative pole of the direct current power supply is connected to one end of a coil of the intermediate relay or the contactor through a control switch, the other end of the coil of the intermediate relay or the contactor is connected to the negative / positive pole of the direct current power supply, and a second voltage measuring device is connected between both ends of the coil of the intermediate relay or the contactor.

Description

Technical Field

[0001] The utility model discloses a wide temperature range air source heat pump, in particular to a wide temperature range air source heat pump compressor fault diagnosis device, belonging to the technical field of wide temperature range air source heat pumps. Background Art

[0002] The wide temperature range air source heat pump system is an air conditioning system that uses gas (including natural gas, liquefied petroleum gas, biogas, etc.) as a high-grade driving energy source, directly drives the open compressor through the work of the gas engine, and then completes the steam compression refrigeration cycle to achieve the purpose of cooling or heating. Compared with the electric heat pump (EHP) that uses electricity as a high-grade driving energy source, the gas heat pump is no different in heat pump theory. It uses a high-efficiency gas engine to replace the electric motor of the electric heat pump. Due to the change in the driving source, there will be a large amount of engine cylinder liner heat and exhaust waste heat that can be recycled to build a distributed energy system for cascade utilization of energy, thereby significantly improving the utilization rate of primary energy.

[0003] The compressor of the wide temperature range air source heat pump is a mechanical transmission compressor, not a motor drive. The start of the compressor is controlled by the clutch. When the clutch is powered, the compressor starts running; when the clutch is powered off, the compressor stops running. The clutch is usually powered by direct current, and the clutch is controlled on and off through an intermediate relay or a direct contactor. Due to the existence of too many intermediate control links, and only control output without status feedback, remote monitoring or cloud functions can only diagnose that the compressor is not working based on the operating parameter data, but cannot determine whether the clutch is faulty, the intermediate control link is faulty, or the compressor itself is faulty. If the specific fault point can be located, it will bring great convenience to operation and maintenance after-sales, and the problem can be solved on site in a targeted manner. Summary of the invention

[0004] In view of the above-mentioned shortcoming that the wide temperature range air source heat pump system in the prior art cannot determine the specific fault point, the utility model provides a new wide temperature range air source heat pump compressor fault diagnosis device, which can accurately determine the fault point and analyze which control environment is abnormal through comprehensive detection of voltage, current and pressure.

[0005] The utility model adopts the following technical solution to solve its technical problems: a wide temperature range air source heat pump compressor fault diagnosis device, the fault diagnosis device comprises a gas engine and a compressor, the gas engine is connected to the compressor, a high-pressure pressure sensor is connected to the pipeline at the compressor output end, a low-pressure pressure sensor is connected to the pipeline at the compressor input end, an electromagnetic clutch is arranged in the compressor, a first voltage measuring device is connected to both ends of the electromagnetic clutch, an intermediate relay or contactor is connected to the negative / positive channel of the electromagnetic clutch, a switch contact of the intermediate relay or contactor is connected to the negative / positive pole of a DC power supply, the positive / negative pole of the DC power supply is connected to the positive / negative pole of the electromagnetic clutch, the positive / negative pole of the DC power supply is connected to one end of the coil of the intermediate relay or contactor through a control switch, the other end of the coil of the intermediate relay or contactor is connected to the negative / positive pole of the DC power supply, and a second voltage measuring device is connected between both ends of the coil of the intermediate relay or contactor.

[0006] The technical solution adopted by the utility model to solve its technical problems further includes:

[0007] The compressor is provided with a belt pulley, the gas engine is connected to the compressor via a belt, and the electromagnetic clutch is arranged inside the belt pulley.

[0008] The negative / positive electrode channel of the electromagnetic clutch is connected with a current measuring device.

[0009] The fault diagnosis device also includes an oil separator, which is connected to the output end of the compressor.

[0010] The fault diagnosis device also includes a four-way valve, which is connected to the output end of the oil separator.

[0011] The fault diagnosis device also includes an indoor heat exchanger and an outdoor heat exchanger, and the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the four-way valve.

[0012] The fault diagnosis device also includes an electronic expansion valve, which is connected between the indoor heat exchanger and the outdoor heat exchanger.

[0013] The fault diagnosis device also includes a gas-liquid separator, and the output of the gas-liquid separator is connected to the compressor.

[0014] There are two compressors, which are connected to the gas engine via belts.

[0015] The beneficial effect of the utility model is that in the actual operation of the wide temperature range air source heat pump air conditioning system, the utility model cannot remotely and accurately lock the fault point after the core component compressor fails (the manifestation is that the air conditioner cannot cool or heat normally), and it takes a lot of manpower and material resources to diagnose the problem at the project site and then repair the fault point. Through the utility model, when the air conditioner has a compressor-related fault, the fault point can be accurately determined and which control environment has an abnormality. The operation and maintenance personnel can directly go to the project site to solve specific problems in a targeted manner, greatly improving the operation and maintenance efficiency.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the connection mode between the engine and the compressor in the utility model.

[0018] Figure 2 It is a schematic diagram of the structure of the medium-wide temperature range air source heat pump system of the utility model.

[0019] Figure 3 It is a schematic diagram of the fault diagnosis device for air source heat pump compressor in a medium to wide temperature range of the utility model.

[0020] Figure 4 This is a flow chart of the compressor fault diagnosis method in the utility model. DETAILED DESCRIPTION

[0021] This embodiment is a preferred implementation mode of the utility model. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the utility model.

[0022] Please see attached Figure 1 In the utility model, the air source heat pump used in the wide temperature range is an open compressor, in which the gas engine drives the flywheel of the compressor to rotate through a belt or other transmission device, and drives the compressor to work or stop under the control of the electromagnetic clutch. In this embodiment, a belt connection method is adopted, and one gas engine drives two compressors to work at the same time, namely the first compressor 1 and the second compressor 2.

[0023] Please refer to the attached Figure 2The wide temperature range air source heat pump system in this embodiment includes a gas engine, a compressor, an oil separator, a four-way valve ST, an indoor unit heat exchanger, an outdoor unit heat exchanger, an electronic expansion valve EXV1 and a gas-liquid separator. The gas engine is connected to the compressor, and the compressor is driven to work by the gas engine. The output end of the compressor is connected to the oil separator, and the lubricating oil part is separated and input back to the compressor. The output of the oil separator is connected to the indoor unit heat exchanger through the four-way valve ST, and the indoor unit heat exchanger is connected to the outdoor unit heat exchanger. An electronic expansion valve EXV1 is connected between the indoor unit heat exchanger and the outdoor unit heat exchanger. The output of the outdoor unit heat exchanger is connected to the gas-liquid separator through the four-way valve ST, and the output of the gas-liquid separator is connected to the compressor. A high-pressure pressure sensor HP is connected to the pipeline at the output end of the compressor, and a low-pressure pressure sensor LP is connected to the pipeline at the input end of the compressor.

[0024] When working, the gas (including natural gas, liquefied petroleum gas, coal gas or biogas, etc.) is sent to the gas engine (internal combustion engine) for combustion, and part of the released heat energy is converted into mechanical energy to drive the compressor of the heat pump system. The entire wide temperature range air source heat pump system is generally divided into three parts: the power part, the controller part and the heat pump system part. Among them, the power part is the gas engine that provides the power source; the controller part is composed of various sensors and the controller body; the heat pump system part is composed of the compressor, condenser, evaporator and throttling device.

[0025] During operation, the low-temperature and low-pressure gaseous refrigerant in the system is compressed by the compressor to form a high-temperature and high-pressure gaseous refrigerant that flows through the condenser for condensation. The condensed high-pressure liquid refrigerant flows through the throttling device for throttling and pressure reduction. After throttling, the low-temperature and low-pressure gas-liquid two-phase refrigerant evaporates into a low-temperature and low-pressure gaseous refrigerant through the evaporator. Then, the low-temperature and low-pressure gaseous refrigerant returns to the compressor and continues to be compressed into a high-temperature and high-pressure gaseous refrigerant and discharged to the condenser, thus forming a complete heat pump system cycle. The high-pressure pressure sensor HP and the low-pressure pressure sensor LP can detect the pressure at this point. When the compressor is operating normally, there is a pressure difference P1 between the high-pressure pressure sensor HP and the low-pressure pressure sensor LP.

[0026] Please refer to the attached Figure 3 , attached Figure 3In the figure, a pulley 32 is connected to a compressor body 31, and an electromagnetic clutch is included inside the pulley 32. A first voltage measuring device 35 is connected to both ends of the electromagnetic clutch. An intermediate relay or contactor 36 is connected to the negative electrode channel of the electromagnetic clutch. The intermediate relay or contactor 36 is connected to the negative electrode of a DC power supply 44 through a switch contact 37 of the intermediate relay or contactor 36. The positive electrode of the DC power supply 44 is connected to the positive electrode of the electromagnetic clutch. The positive electrode of the DC power supply 44 is connected to one end of a coil 38 of the intermediate relay or contactor 36 through a control switch 43. The other end of the coil 38 of the intermediate relay or contactor 36 is connected to the negative electrode of the DC power supply 44. A second voltage measuring device 42 is connected between both ends of the coil 38 of the intermediate relay or contactor 36.

[0027] In this embodiment, the switch contact 37 of the intermediate relay or contactor 36 is connected to the negative electrode of the DC power source 44 , and in specific implementation, it can also be connected to the positive electrode of the DC power source 44 .

[0028] In this embodiment, the control switch 43 is connected to the positive electrode of the DC power supply 44 . In a specific implementation, the control switch 43 may also be connected to the negative electrode of the DC power supply 44 .

[0029] When the electromagnetic clutch is powered on, the working principle of the electromagnetic clutch is based on electromagnetic induction. When the excitation coil in the electromagnetic clutch is powered on, a magnetic field is generated, which magnetizes the iron core on the rotor. At the same time, there is a certain friction between the friction plate and the rotor, so that the rotor and the friction plate establish a mechanical connection. When the excitation coil of the electromagnetic clutch is powered on, the magnetic field magnetizes the iron core on the rotor, and the friction between the rotor and the friction plate increases. In this case, the input shaft is rotated, that is, the rotation of the rotor will be transmitted to the output shaft; when the excitation coil is powered off, the magnetic field disappears, the magnetization of the iron core also disappears, and the friction force is reduced. At this time, the friction between the rotor and the friction plate is not enough to transmit power, and the output shaft stops rotating. That is, by controlling the excitation coil of the electromagnetic clutch, the clutch works when powered on, and stops working when powered off.

[0030] During operation, the pulley part 32 drives the compressor body 31 to work, the switch contact 37 in the intermediate relay or contactor 36 is energized, and the clutch is energized. The control switch 43 is closed, the coil 38 of the intermediate relay or contactor 36 is energized to work, and the DC power supply 44 provides an energy source for the intermediate relay or contactor 36. The first voltage measuring device 35 measures the voltage difference Vab=|Va-Vb| between point a and point b, and the second voltage measuring device 42 measures the voltage difference between point d and point e, Vde=|Vd-Ve|. When the control system controls the control switch 43 to be energized, at this time the Vde voltage exceeds the calibrated voltage V0, the coil 38 of the intermediate relay or contactor 36 is energized to generate magnetic force, and the switch contact 37 in the intermediate relay or contactor 36 is energized. At this time, Vab has voltage and point c has current passing through, indicating that the clutch is energized. If the engine is in operation at this time, the compressor runs to compress the refrigerant, Figure 2 The pressure difference P1 between the high-pressure pressure sensor HP and the low-pressure pressure sensor LP is not zero.

[0031] If the control switch 43 is closed after the compressor is controlled to engage, and if there is voltage on Vde, then the intermediate relay or contactor 36 is operating normally, and there is voltage between Vab. If the voltage value of Vab is less than the calibration value V1, it can be determined that the intermediate relay 36 is faulty. If the voltage value of Vab is greater than or equal to the calibration value V1, but the current Ic at point c is less than the calibration value I1, and the pressure difference P1 between the high-pressure pressure sensor HP and the low-pressure pressure sensor LP does not exceed the limit value P0, it can be determined that the clutch is faulty.

[0032] Please refer to the attached Figure 4 The fault judgment method of the utility model, that is, the compressor fault diagnosis method, comprises the following steps:

[0033] Step S1, the controller issues a compressor engagement instruction;

[0034] Step S2 determines whether P1 is greater than the calibration value P0, if so, execute step S3, otherwise execute step S4;

[0035] Step S3, conclude that the compressor is normal;

[0036] Step S4, compare the pressure difference between Vd and Ve, if the absolute value of the pressure difference does not exceed the calibration value V0, execute step S6, otherwise execute step S7;

[0037] Step S6, it is concluded that the control system fails and the control switch 43 is abnormal;

[0038] Step S7, measuring current Ic;

[0039] Step S8, determine whether Ic exceeds the calibration value I0, if so, execute S9, otherwise execute step S10;

[0040] Step S9, determining whether the compressor body has a fault;

[0041] Step S10, comparing the values ​​of Va and Vb;

[0042] Step S11, determine whether the absolute value of the pressure difference between Va and Vb exceeds the calibration value V1, if not, execute step S12, otherwise execute step S13;

[0043] Step S12, conclude that relay 36 is faulty;

[0044] Step S13: conclude that the clutch of the compressor fails.

[0045] Through the above steps, you can quickly determine remotely which link has failed, solve the problem in a targeted manner, and improve operation and maintenance efficiency.

[0046] This utility model is aimed at the wide temperature range air source heat pump air conditioning system. In the actual operation process, when the core component compressor fails (the air conditioner cannot cool or heat normally), it is impossible to remotely and accurately lock the fault point, and it takes a lot of manpower and material resources to diagnose the problem at the project site and then perform repairs on the fault point. Through this utility model, when the air conditioner has a compressor-related failure, the fault point can be accurately determined, and which control environment has an abnormality can be analyzed. The operation and maintenance personnel can directly go to the project site to solve specific problems in a targeted manner, greatly improving the operation and maintenance efficiency.

Claims

1. A wide temperature range air source heat pump compressor fault diagnosis device, characterized by: The fault diagnosis device includes a gas engine and a compressor. The gas engine is connected to the compressor. A high-pressure pressure sensor is connected to the pipeline at the output end of the compressor. A low-pressure pressure sensor is connected to the pipeline at the input end of the compressor. An electromagnetic clutch is arranged in the compressor. A first voltage measuring device is connected to both ends of the electromagnetic clutch. An intermediate relay or contactor is connected to the negative / positive channel of the electromagnetic clutch. The switch contacts of the intermediate relay or contactor are connected to the negative / positive pole of a DC power supply. The positive / negative pole of the DC power supply is connected to the positive / negative pole of the electromagnetic clutch. The positive / negative pole of the DC power supply is connected to one end of the coil of the intermediate relay or contactor through a control switch. The other end of the coil of the intermediate relay or contactor is connected to the negative / positive pole of the DC power supply. A second voltage measuring device is connected between the two ends of the coil of the intermediate relay or contactor.

2. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 1 is characterized in that: The compressor is provided with a belt pulley, the gas engine is connected to the compressor via a belt, and the electromagnetic clutch is arranged inside the belt pulley.

3. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 1 is characterized in that: The negative / positive electrode channel of the electromagnetic clutch is connected with a current measuring device.

4. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 1 is characterized in that: The fault diagnosis device also includes an oil separator, which is connected to the output end of the compressor.

5. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 4 is characterized in that: The fault diagnosis device also includes a four-way valve, which is connected to the output end of the oil separator.

6. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 5 is characterized in that: The fault diagnosis device also includes an indoor heat exchanger and an outdoor heat exchanger, and the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the four-way valve.

7. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 6 is characterized in that: The fault diagnosis device also includes an electronic expansion valve, which is connected between the indoor heat exchanger and the outdoor heat exchanger.

8. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 1, characterized in that: The fault diagnosis device also includes a gas-liquid separator, and the output of the gas-liquid separator is connected to the compressor.

9. The wide temperature range air source heat pump compressor fault diagnosis device according to claim 1, characterized in that: There are two compressors, which are connected to the gas engine via belts.

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