Variable frequency control system for increasing and distributing power compressor of GHP heat pump unit

Abstract

The utility model discloses a frequency conversion control system of a GHP heat pump unit power increasing and distribution compressor, and belongs to the technical field of GHP gas heat pumps. According to the technical scheme, the system comprises a GHP gas heat pump, a data level converter, a main controller, a frequency converter and an electric compressor, the GHP gas heat pump is in circuit connection with the data level converter, the data level converter is in circuit connection with the main controller, the main controller is in circuit connection with the frequency converter, and the frequency converter is in circuit connection with the electric compressor. The frequency conversion control system has the beneficial effects that the operation frequency of the electric compressor can be intelligently adjusted according to different operation conditions of a GHP gas heat pump, the safe and stable operation of equipment is ensured, the energy efficiency of partial load is greatly improved, and the economical efficiency and the energy-saving property are remarkably improved; the device has wide application prospects and market potential, and provides powerful support for the development of the technical field of GHP gas heat pumps.

Description

Technical Field

[0001] The utility model relates to the technical field of GHP gas heat pumps, in particular to a frequency conversion control system for an additional electric compressor of a GHP heat pump unit. Background Art

[0002] As energy issues become increasingly prominent, energy conservation and consumption reduction have become the common pursuit of all industries. In the field of GHP gas heat pumps, the compressor is driven by a gas engine, but the product characteristics of GHP require a high investment. If GHP and electric compressors are used together, it can not only reduce the overall investment of the equipment, but also greatly improve the energy efficiency at partial load. Therefore, the development of a control system that can intelligently adjust the operating frequency of the electric compressor is of great significance to improving the operating efficiency of GHP and reducing energy consumption. Utility Model Content

[0003] In order to overcome the deficiencies in the above-mentioned prior art, the utility model provides a frequency conversion control system for an additional electric compressor of a GHP heat pump unit. The control system utilizes advanced electric compressor frequency conversion control technology and a programmable controller to achieve efficient, stable and energy-saving operation of the compressor, thereby improving the performance and efficiency of the GHP gas heat pump.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A frequency conversion control system for a GHP heat pump unit equipped with an electric compressor comprises: a GHP gas heat pump, a data level converter, a main controller, a frequency converter, and an electric compressor, wherein the GHP gas heat pump is connected to a data level converter circuit, the data level converter is connected to a main controller circuit, the main controller is connected to a frequency converter circuit, and the frequency converter is connected to an electric compressor circuit.

[0006] Further, the data level converter comprises:

[0007] A data parsing circuit for parsing the OPT data logic level into a TTL logic level, connected to a level conversion circuit for converting the parsed TTL logic level into a 3-wire RS-232 bus interface;

[0008] A power supply unit for supplying power to the data parsing circuit and the level conversion circuit, wherein the power supply unit is connected to the data parsing circuit and the level conversion circuit respectively;

[0009] The RS-232 level output module is connected to the level conversion circuit.

[0010] Furthermore, the GHP gas heat pump is provided with a GHP main control substrate, and the GHP main control substrate is provided with an OPT terminal.

[0011] Furthermore, the data analysis circuit includes an OPT terminal interface for connecting to an OPT terminal of the GHP main control substrate.

[0012] Furthermore, the data analysis circuit includes a TXD interface and a RXD interface for connecting to a controller.

[0013] Furthermore, the level conversion circuit adopts a MAX3232 chip.

[0014] Furthermore, the power supply unit adopts MC34063AD voltage conversion chip.

[0015] Furthermore, the main controller adopts a programmable controller PLC, and the main controller communicates data with the GHP through a data level converter to receive the electric compressor operating frequency control information transmitted by the GHP.

[0016] Furthermore, the programmable controller PLC includes an RS232 communication module, an RS485 communication module and a logic control unit, the RS232 communication module is connected to a data level converter, and the RS485 communication module and the logic control unit are respectively connected to the frequency converter.

[0017] Furthermore, the main controller controls the start and stop of the inverter according to the received electric compressor operating frequency control information, automatically calculates the appropriate output frequency, and transmits the output frequency signal to the inverter in the form of a communication signal to adjust the inverter output frequency.

[0018] Furthermore, the frequency converter is installed in the GHP gas heat pump, receives the frequency signal obtained by the main controller through logical calculation, and converts the signal into a signal for controlling the operation of the electric compressor.

[0019] Furthermore, the startup mode is executed: when the electric compressor operating frequency control information sent by the GHP gas heat pump is not 0, the main controller controls the inverter to start and sends the control frequency to the inverter. When the inverter output frequency slowly increases to the control frequency, the startup process ends.

[0020] Furthermore, the shutdown mode is executed: when the electric compressor operating frequency control information sent by the GHP gas heat pump is 0 or the inverter is abnormal, the main controller actively stops the inverter and the inverter output frequency is also 0.

[0021] Furthermore, the variable frequency control mode is executed: when the electric compressor operating frequency control information sent by the GHP gas heat pump is not 0 and the startup process has been completed, the variable frequency control mode is entered.

[0022] Beneficial effects of the utility model:

[0023] Compared with the prior art, the variable frequency control system for the GHP heat pump unit equipped with an electric compressor described in the utility model utilizes advanced electric compressor variable frequency control technology and a programmable controller to achieve efficient, stable, and energy-saving operation of the compressor, thereby improving the performance and efficiency of the GHP gas heat pump. The system can intelligently adjust the operating frequency of the electric compressor according to the different operating conditions of the GHP gas heat pump, realize the variable frequency control function of the compressor, and ensure the safe and stable operation of the GHP gas heat pump. Through the variable frequency control function of the system, the energy efficiency at partial load can be effectively improved, and the energy-saving effect is greatly improved, which meets the social needs of energy conservation and environmental protection.

[0024] The system can intelligently adjust the operating frequency of the electric compressor according to the different operating conditions of the GHP gas heat pump, ensure the safe and stable operation of the equipment, greatly improve the partial load energy efficiency, and significantly improve the economy and energy saving. The utility model has broad application prospects and market potential, and provides strong support for the development of the GHP gas heat pump technology field. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the implementation of the utility model, the utility model will be described in detail below in combination with the drawings and detailed implementation. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 It is a structural schematic diagram of the utility model;

[0027] Figure 2 This is the main controller intelligent frequency conversion control logic flow chart of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the data level converter of the utility model;

[0029] Figure 4 This is a logic flow chart of the GHP substrate of the data level converter of the utility model connecting to peripheral devices through the level converter. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Figure 1-4 The variable frequency control system of the additional electric compressor of the GHP heat pump unit is further explained.

[0031] Example 1

[0032] The variable frequency control system for the GHP heat pump unit with an additional electric compressor includes a GHP gas heat pump, a main controller, a data level converter, a frequency converter and an electric compressor. The GHP gas heat pump is connected to the data level converter circuit, the data level converter is connected to the main controller circuit, the main controller is connected to the frequency converter circuit, and the frequency converter is connected to the electric compressor circuit.

[0033] The GHP heat pump unit is equipped with an electric compressor variable frequency control system. The main controller adopts a programmable controller PLC, which communicates with the GHP through a data level converter. As a logic control unit of the variable frequency control system, it automatically calculates and controls the frequency and start and stop of the electric compressor.

[0034] The GHP heat pump unit is equipped with a variable frequency control system for an electric compressor, and the GHP is connected to the main controller in the form of an RS-232 bus through a data level converter.

[0035] The GHP heat pump unit is equipped with a variable frequency control system for the electric compressor. The GHP transmits the required electric compressor operating frequency control information to the main controller. The main controller automatically calculates the appropriate output frequency based on the received data and transmits the output frequency signal to the inverter.

[0036] The frequency conversion control system of the GHP heat pump unit with an additional electric compressor has a main controller connected to the inverter in the form of RS-485 bus, and directly obtains the internal data of the inverter, such as the current output frequency, output current, and operation status of the inverter.

[0037] The GHP heat pump unit is equipped with a variable frequency control system for an electric compressor. The frequency converter receives a control command signal and drives the electric compressor to operate, thereby realizing a variable frequency control function.

[0038] The variable frequency control system of the GHP heat pump unit equipped with an electric compressor can achieve efficient, stable and energy-saving operation of the GHP by intelligently adjusting the operating frequency of the electric compressor, thereby improving the overall performance and meeting the social needs of energy conservation and environmental protection.

[0039] Example 2

[0040] This embodiment is a new embodiment or a supplement to Embodiment 1.

[0041] like Figure 1As shown, the frequency conversion control system of the GHP heat pump unit with an additional electric compressor of the utility model includes a GHP, a data level converter, a main controller, a frequency converter and an electric compressor. The components are connected through circuits to form a complete control system. The main controller adopts a programmable controller PLC, and communicates data with the GHP through a data level converter. The GHP transmits the required electric compressor operation frequency control information to the main controller, and the main controller outputs a suitable frequency signal to the frequency converter after logical calculation. The frequency converter receives the signal and converts it, drives the electric compressor to operate, and realizes the optimized frequency conversion control function.

[0042] 1. In actual application, GHP transmits the required electric compressor operating frequency control information to the main controller through the data level converter according to its own operating conditions. The main controller uses a programmable controller PLC, which calculates the appropriate output frequency through the built-in logic algorithm based on the received data. The main controller transmits the calculated output frequency signal to the inverter. After receiving the frequency signal from the main controller, the inverter drives the operating frequency of the electric compressor to realize the frequency conversion control function.

[0043] 2. Figure 2 As shown, the main controller performs logical judgment on the electric compressor operating frequency control information sent by the GHP. According to different control information, the variable frequency control system of the electric compressor is divided into three modes: start mode, variable frequency control mode and stop mode.

[0044] 1) Stop mode: When the electric compressor operating frequency control information sent by GHP is 0 or the inverter is abnormal, the main controller actively stops the inverter and the inverter output frequency is also 0.

[0045] 2) Startup mode: When the electric compressor operating frequency control information sent by GHP is not 0, the main controller controls the inverter to start and sends the control frequency (15HZ) to the inverter. When the inverter output frequency slowly increases to the control frequency (15HZ), the startup process ends.

[0046] 3) Frequency conversion control mode: When the electric compressor operating frequency control information sent by GHP is not 0 and the startup process has been completed, the frequency conversion control mode is entered.

[0047] A.GHP varies the electric compressor operating frequency control information from GHP between 15HZ and 100HZ according to different operating conditions.

[0048] B. The main controller detects the inverter output current in real time, and automatically adjusts the inverter output frequency according to the electric compressor operating frequency control information sent by GHP, so that the inverter output current is within a safe range, ensuring the safe and stable operation of the electric compressor.

[0049] C. When the inverter output frequency needs to be increased, the main controller increases the inverter output frequency at a rate of 1HZ per second until the inverter output frequency is consistent with the electric compressor operating frequency control information sent by GHP, and the output frequency no longer increases.

[0050] D. When the inverter output frequency needs to be reduced, the main controller reduces the inverter output frequency at a rate of 2HZ per second until the inverter output frequency is consistent with the electric compressor operating frequency control information sent by GHP, and the output frequency no longer decreases.

[0051] E. When the system is in a special operating condition, the operating current of the electric compressor will increase. When the operating current of the electric compressor reaches the limit value, even if the electric compressor operating frequency control information sent by the GHP requires an increase in frequency, the main controller will control the output frequency of the inverter to stop increasing until the compressor operating current is less than the limit value, and then the inverter output frequency will be increased.

[0052] F. When the operating current of the electric compressor exceeds the limit value and reaches the safety value, the main controller actively controls the inverter to reduce the output frequency until the operating current of the electric compressor is less than the safety value, and the inverter output frequency is no longer reduced.

[0053] G. Under the variable frequency control mode, the operating current of the electric compressor is stabilized below the safe value under the control of the main controller.

[0054] Through the compressor frequency conversion control system of the utility model, the operating frequency of the electric compressor can be intelligently adjusted according to the different operating conditions of the GHP gas heat pump to ensure the safe and stable operation of the equipment. At the same time, since the operating frequency of the electric compressor can be accurately controlled, the operating energy consumption of the GHP can be effectively reduced.

[0055] In summary, the variable frequency control system of the GHP heat pump unit with an additional electric compressor of the utility model has the advantages of simple structure, easy implementation, high efficiency and energy saving, is suitable for the application scenarios of GHP gas heat pumps, and has broad market prospects and application value.

[0056] Example 3

[0057] This embodiment provides a data level converter required in Embodiment 1 and Embodiment 2, such as Figure 3 and Figure 4 As shown, it includes a power supply unit, a data analysis circuit, and a level conversion circuit. The data analysis circuit is connected to the level conversion circuit; the power supply unit is respectively connected to the data analysis circuit and the level conversion circuit; and the RS-232 level output module is connected to the level conversion circuit.

[0058] The data level converter of the GHP parses the OPT interface data in the GHP into TTL level, and then converts the TTL level into the RS-232 bus interface.

[0059] The GHP data level converter, the OPT interface in the GHP is a half-duplex communication with two signal lines, and data transmission can only be carried out alternately between two directions, that is, at the same time, data can only be transmitted in one direction. The data level is 0 to 13V, the level signal is special and requires the GHP main control substrate to cooperate with the control to distinguish between logic "1" and logic "0", and common devices are difficult to be compatible with this interface.

[0060] The data level converter of the GHP and the RS-232 bus interface can realize full-duplex communication. In general applications, a simple full-duplex communication process can be realized by using three signal lines (receiving line, transmitting line and signal line).

[0061] 1. The power supply unit is the power supply for the data analysis circuit and the level conversion circuit. The power input of the data level converter is 24V DC. Through the MC34063AD voltage conversion chip and peripheral circuits, the 24V DC is converted into 5V DC to drive the data analysis circuit and the level conversion circuit.

[0062] 2. The level conversion circuit converts the parsed TTL level into a 3-wire RS-232 bus interface through the MAX232 chip and peripheral circuits.

[0063] 1) In TTL level, the voltage of 2V to 5V is called high level, and 0V to 0.8V is called low level.

[0064] A high level is equivalent to a logic "1" and a low level is equivalent to a logic "0".

[0065] 2) The RS-232 bus interface high level voltage range is +3 to +15V, and the low level voltage range is -3 to -15V.

[0066] A high level is equivalent to a logic "1" and a low level is equivalent to a logic "0".

[0067] 3) After the RXD of the RS-232 bus interface receives the logic "1" or "0", it is converted into TTL level and sent to the data analysis circuit logic "1" or "0" through the TXD pin.

[0068] 4) After the data analysis circuit receives the logic "1" or "0", it performs level conversion through the level conversion circuit, and the TXD pin of the RS-23 bus sends the logic "1" or "0".

[0069] 3. The data analysis circuit converts the difficult-to-recognize OPT data logic level into the easier-to-recognize TTL logic level.

[0070] 1) The OPT port of the GHP control board sends data logic "1" or "0", and the analysis circuit interprets the received data as TTL level logic "1" or "0"

[0071] 2) When the OPT port of the GHP control board receives data, the analysis circuit converts the logic "1" or "0" into the logic "1" or "0" that the OPT port can recognize.

[0072] 3) The OPT port data analysis of the GHP control substrate requires the cooperation between the GHP substrate and the data level converter. The data level converter is a dedicated level analysis of the GHP.

[0073] 4) When the OPT port of the GHP control substrate sends data, the internal receiving data pin is forced to a high level. At this time, the OPT port and the data analysis circuit form a receiving and analyzing data loop. At this time, the data analysis loop only receives data.

[0074] 5) When the OPT port of the GHP control substrate receives data, the internal data transmission pin is forced to a high level. At this time, the OPT port and the data analysis circuit form a data transmission and analysis loop. At this time, the data analysis loop only sends data.

[0075] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and utility model concept of the utility model within the technical scope disclosed by the utility model. Without departing from the concept of the utility model, simple deductions and substitutions can also be made, which should be covered by the protection scope of the utility model.

Claims

1. A frequency conversion control system for a GHP heat pump unit with an additional electric compressor, characterized in that: include: A GHP gas heat pump, a data level converter, a main controller, a frequency converter, and an electric compressor. The GHP gas heat pump is connected to the data level converter circuit, the data level converter is connected to the main controller circuit, the main controller is connected to the frequency converter circuit, and the frequency converter is connected to the electric compressor circuit.

2. The variable frequency control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 1, characterized in that: The data level converter comprises: A data parsing circuit for parsing the OPT data logic level into a TTL logic level, connected to a level conversion circuit for converting the parsed TTL logic level into a 3-wire RS-232 bus interface; A power supply unit for supplying power to the data parsing circuit and the level conversion circuit, wherein the power supply unit is connected to the data parsing circuit and the level conversion circuit respectively; The RS-232 level output module is connected to the level conversion circuit.

3. The frequency conversion control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 2, characterized in that: The GHP gas heat pump is provided with a GHP main control substrate, and the GHP main control substrate is provided with an OPT terminal.

4. The frequency conversion control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 3, characterized in that: The data analysis circuit includes an OPT terminal interface for connecting to an OPT terminal of a GHP main control substrate.

5. The variable frequency control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 4, characterized in that: The data analysis circuit includes a TXD interface and a RXD interface for connecting to a controller.

6. The frequency conversion control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 4, characterized in that: The level conversion circuit adopts the MAX3232 chip.

7. The frequency conversion control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 4, characterized in that: The power supply unit adopts MC34063AD voltage conversion chip.

8. The variable frequency control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 1, characterized in that: The main controller adopts a programmable controller PLC.

9. The variable frequency control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 8, characterized in that: The programmable controller PLC comprises an RS232 communication module, an RS485 communication module and a logic control unit, the RS232 communication module is connected to a data level converter, and the RS485 communication module and the logic control unit are respectively connected to the frequency converter.

10. The variable frequency control system for the GHP heat pump unit with an additional electric compressor as claimed in claim 1, characterized in that: The frequency converter is installed in the GHP gas heat pump.

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