A control system for a -25℃ ultra-low temperature and noise-reducing screw air source heat pump unit

Abstract

The present application discloses a control system for a 25°C ultra-low temperature and noise-reducing screw air source heat pump unit, comprising a fan control module, a PLC module, a communication module and an electronic expansion valve module, wherein the PLC module comprises a CPU unit, an analog quantity unit and an expansion module unit, and the communication module and the electronic expansion valve module are connected to the PLC module. The control system has the following advantages: the problem of excessive noise generated by the air source heat pump unit is solved, and the low noise effect of the air source heat pump unit during heating is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control system of a -25°C ultra-low temperature and noise-reducing screw air source heat pump unit. Background Art

[0002] The ambient temperature in the north is low, so low-temperature heating equipment is needed. In order to protect the environment, save energy and save space, people use air source heat pump units for centralized heating. The use of clean energy can prevent secondary pollution to the environment. However, when the screw compressor is running, the fan and compressor noise are louder than the scroll module unit, which puts forward higher requirements for places with higher noise requirements such as residential areas and office buildings. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a control system for a -25°C ultra-low temperature noise-reducing screw air source heat pump unit, which solves the problem of excessive noise generated by the air source heat pump unit and achieves a low-noise effect when the air source heat pump unit is heating.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A control system for a -25°C ultra-low temperature and noise-reducing screw air source heat pump unit comprises a fan control module, a PLC module, a communication module and an electronic expansion valve module. The PLC module comprises a CPU unit, an analog quantity unit and an expansion module unit. The communication module and the electronic expansion valve module are connected to the PLC module.

[0006] Furthermore, the fan control module includes a phase-loss phase sequence protector XJ3-D, which is connected to the U line, V line and W line of the three-phase power line, and the U line, V line and W line of the three-phase power line are connected to one end of the circuit breaker QF1, and the other end of the circuit breaker QF1 is connected to one end of the circuit breaker QF2, one end of the circuit breaker QF3, one end of the circuit breaker QF4, one end of the contactor KM1 switch and one end of the contactor KM3 switch, and the other end of the contactor KM1 switch is connected to one end of the thermal relay FR1, and the other end of the thermal relay FR1 is connected to one end of the compressor M1, and the other end of the compressor M1 is connected to the other end of the contactor KM3 switch and the contactor KM2 switch.

[0007] Further, the other end of the circuit breaker QF2 is connected to the R pin, S pin and T pin of the frequency converter G1, the Dl1 pin of the frequency converter G1 is connected to the switch of the relay KA4, the Dl4 pin of the frequency converter G1 is connected to the switch of the relay KA6, the U pin, V pin and W pin of the frequency converter G1 are connected to one end of the thermal relay FR2, one end of the thermal relay FR3, one end of the thermal relay FR4 and one end of the thermal relay FR5, the other end of the thermal relay FR2 is connected to the 1# fan M2, the other end of the thermal relay FR3 is connected to the 2# fan M3, the other end of the thermal relay FR4 is connected to the 3# fan M4, and the other end of the thermal relay FR5 is connected to the 4# fan M5;

[0008] The other end of the circuit breaker QF3 is connected to the R pin, S pin and T pin of the frequency converter G2, the Dl1 pin of the frequency converter G2 is connected to the switch of the relay KA4, the Dl4 pin of the frequency converter G1 is connected to the switch of the relay KA6, the U pin, V pin and W pin of the frequency converter G2 are connected to one end of the thermal relay FR6, one end of the thermal relay FR7, one end of the thermal relay FR8 and one end of the thermal relay FR9, the other end of the thermal relay FR6 is connected to the 5# fan M6, the other end of the thermal relay FR7 is connected to the 6# fan M7, the other end of the thermal relay FR8 is connected to the 7# fan M8, and the other end of the thermal relay FR9 is connected to the 8# fan M9;

[0009] The other end of the circuit breaker QF4 is connected to one end of the contactor KM4, the other end of the contactor KM4 is connected to one end of the water tray heating resistor R1, one end of the water tray heating resistor R2 and one end of the water tray heating resistor R3, and the other ends of the water tray heating resistor R1, the other ends of the water tray heating resistor R2 and the other ends of the water tray heating resistor R3 are connected to the N line of the three-phase power line.

[0010] Further, the CPU unit includes a chip U1, the model of the chip U1 is SR60, the 1M pin of the Dla area of ​​the chip U1 is connected to the DC end of the power supply, the 4 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S1, and the other end of the switch S1 is connected to 24V, and this part is used for low-voltage control of the compressor; the 5 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S2, and the other end of the switch S2 is connected to 24V, and this part is used for high-voltage control of the compressor; the 5 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S2, and the other end of the switch S2 is connected to 24V, and this part is used for high-voltage control of the compressor; the 6 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S3, and the other end of the switch S3 is connected to 24V, and this part is used for overload control of the compressor; the 7 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S4, and the other end of the switch S4 is connected to 24V, and this part is used for oil level switch control;

[0011] Pin 0 of the Dlb area of ​​the chip U1 is connected to one end of the switch S5, and the other end of the switch S5 is connected to 24V, and this part is used for the oil pressure difference switch; Pin 1 of the Dlb area of ​​the chip U1 is connected to one end of the switch S6, and the other end of the switch S6 is connected to 24V, and this part is used for the PTC protection in the machine; Pin 4 of the Dlb area of ​​the chip U1 is connected to 24V, and this part is used for the system phase sequence protection; Pin 5 of the Dlb area of ​​the chip U1 is connected to one end of the switch S7, and the other end of the switch S7 is connected to 24V, and this part is used for the water flow switch; Pin 6 of the Dlb area of ​​the chip U1 is connected to one end of the switch S8, and the other end of the switch S8 is connected to 24V, and this part is used for the overload of the circulating pump; Pin 7 of the Dlb area of ​​the chip U1 is connected to one end of the switch S9, and the other end of the switch S9 is connected to 24V, and this part is used for the remote switch;

[0012] Pin 0 of the Dlc area of ​​the chip U1 is connected to one end of the switch S10, and the other end of the switch S10 is connected to 24V, and this part is used for external alarm; pin 4 of the Dlc area of ​​the chip U1 is connected to 24V; pin 5 of the Dlc area of ​​the chip U1 is connected to one end of the switch S11, and the other end of the switch S11 is connected to 24V, and this part is used for condensing fan overload; pin 7 of the Dlc area of ​​the chip U1 is connected to one end of the switch S12, and the other end of the switch S12 is connected to 24V, and this part is used for phase sequence protection; pin L1 of the Die area of ​​the chip U1 is connected to the positive pole of the power supply, and pin N of the Die area of ​​the chip U1 is grounded.

[0013] Furthermore, the 1L pin, 2L pin and 3L pin of the DQa area of ​​the chip U1 are connected to the positive pole of the power supply, the 1 pin of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM4, and the other end of the coil of the contactor KM4 is grounded, and this part is a 25% solenoid valve; the 2 pin of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM5, and the other end of the coil of the contactor KM5 is grounded, and this part is a 50% solenoid valve; the 3 pin of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM6, and the other end of the coil of the contactor KM6 is connected Ground, this part is the 75% solenoid valve; pin 5 of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM7, and the other end of the coil of the contactor KM7 is grounded. This part is the intermediate relay KA9; pin 6 of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM8, and the other end of the coil of the contactor KM8 is grounded. This part is the intermediate relay KA10; pin 7 of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM9, and the other end of the coil of the contactor KM9 is grounded. This part is the intermediate relay KA11.

[0014] Further, the 0th pin of the DQb area of ​​the chip U1 is connected to one end of the coil of the contactor KM10, and the other end of the coil of the contactor KM10 is grounded, and this part is the liquid injection solenoid valve; the 1st pin of the DQb area of ​​the chip U1 is connected to one end of the coil of the contactor KM11, and the other end of the coil of the contactor KM11 is grounded, and this part is the economizer valve; the 3rd pin of the DQb area of ​​the chip U1 is connected to one end of the coil of the contactor KM12, and the other end of the coil of the contactor KM12 is grounded, and this part is the intermediate relay KA12 and the first speed of the condensing fan; the 4th pin of the DQb area of ​​the chip U1 is connected to one end of the bulb HL2, and the other end of the bulb HL2 is grounded, and this part is a fault indication; the 5th pin of the DQb area of ​​the chip U1 is connected to one end of the coil of the contactor KM13, and the other end of the coil of the contactor KM13 is grounded, and this part is a fault indication; the 4L pin of the DQb area of ​​the chip U1 is connected to the positive pole of the power supply;

[0015] The 5L pin and the 6L pin of the DQc area of ​​the chip U1 are connected to the positive pole of the power supply; the 1 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM14 and one end of the bulb HL3, and the other end of the coil of the contactor KM14 and the other end of the bulb HL3 are grounded, and this part is the intermediate relay KA13 and the circulation pump operation indication; the 2 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM15, and the other end of the coil of the contactor KM15 is grounded, and this part is used for water tray heating; the 3 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM16, and the other end of the coil of the contactor KM16 is grounded, and this part is used for the liquid circuit solenoid valve; the 6 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM17, and the other end of the coil of the contactor KM17 is grounded, and this part is used for the intermediate relay and the second speed of the condensing fan; the L+ pin of the chip U1 is connected to 24V, and the M pin of the chip U1 is grounded.

[0016] Further, the CPU unit also includes an internal protection PTC, the L1 pin of the internal protection PTC is connected to the U line of the three-phase line, the L2 pin of the internal protection PTC is connected to the V line of the three-phase line, the L3 pin of the internal protection PTC is connected to the W line of the three-phase line, the L pin of the internal protection PTC is connected to the L pin of the 220V power supply, the N pin of the internal protection PTC is connected to the N pin of the 220V power supply, the 1 pin of the internal protection PTC is connected to one end of the resistor A, and the other end of the resistor A is connected to the 2 pin of the internal protection PTC;

[0017] The CPU unit also includes a liquid spray electromechanical module, the L pin of the liquid spray electromechanical module is connected to the L pin of the 220V power supply, and the N pin of the liquid spray electromechanical module is connected to the N pin of the 220V power supply;

[0018] The CPU unit further comprises an electronic oil level switch, wherein the L pin of the electronic oil level switch is connected to the L pin of the 220V power supply, and the N pin of the electronic oil level switch is connected to the N pin of the 220V power supply.

[0019] Further, the analog quantity unit includes an SCM-16 analog quantity module, and the 11th pin of the SCM-16 analog quantity module is connected to one end of the pressure gauge P1, and the other end of the pressure gauge P1 is connected to 24V, and this part is used to detect the suction pressure; the 12th pin of the SCM-16 analog quantity module is connected to one end of the pressure gauge P2, and the other end of the pressure gauge P2 is connected to 24V, and this part is used for the exhaust pressure; the 13th pin of the SCM-16 analog quantity module is connected to one end of the pressure gauge P3, and the other end of the pressure gauge P3 is connected to 24V, and this part is used for the medium pressure; the 14th pin of the SCM-16 analog quantity module is connected to one end of the pressure gauge P4, and the other end of the pressure gauge P4 is connected to 24V, and this part is used for the oil pressure; the 15th pin of the SCM-16 analog quantity module is connected to one end of the pressure gauge P5, and the other end of the pressure gauge P5 is connected to 24V, and this part is used for the dew point sensor;

[0020] The X0 pin of the SCM-16 analog module is connected to the 0 pin of the DIa area of ​​the chip U1, the X1 pin of the SCM-16 analog module is connected to the 1 pin of the DIa area of ​​the chip U1, the T1 pin of the SCM-16 analog module is connected to one end of the temperature sensor R11, and the other end of the temperature sensor R11 is connected to the COM pin, which is used for the outlet water temperature; the T2 pin of the SCM-16 analog module is connected to one end of the temperature sensor R12, and the other end of the temperature sensor R12 is connected to the COM pin, which is used for the return water temperature; the T3 pin of the SCM-16 analog module is connected to the temperature sensor R1 3, the other end of temperature sensor R13 is connected to COM pin, this part is used for exhaust temperature; T4 pin of SCM-16 analog module is connected to one end of temperature sensor R14, the other end of temperature sensor R14 is connected to COM pin, this part is used for fin temperature; T5 pin of SCM-16 analog module is connected to one end of temperature sensor R15, the other end of temperature sensor R15 is connected to COM pin, this part is used for press liquid spray temperature; T8 pin of SCM-16 analog module is connected to one end of temperature sensor R16, the other end of temperature sensor R16 is connected to COM pin, this part is used for ambient temperature.

[0021] Furthermore, the communication module includes a GRM202 communication terminal, the GRM202 communication terminal is connected to the expansion module unit, the 24VDC GND pin of the GRM202 communication terminal is connected to the V- pin of the switch electric eye, and the 24VDC VCC pin of the GRM202 communication terminal is connected to the V+ pin of the switch electric eye.

[0022] Furthermore, the model of the electronic expansion valve module is EKE1B, the COM1 pin of the electronic expansion valve module is connected to the 2 pin of the intake pressure sensor AKS32R, the +5V pin of the electronic expansion valve module is connected to the 1 pin of the intake pressure sensor AKS32R, the 3 pin of the intake pressure sensor AKS32R is connected to the AI3 pin of the electronic expansion valve module, the DI1 pin of the electronic expansion valve module is connected to one end of the switch KM1, and the other end of the switch KM1 is connected to the COM2 end of the electronic expansion valve module, the AI2 pin of the electronic expansion valve module is connected to one end of the intake temperature sensor EKS221, and the other end of the intake temperature sensor EKS221 is connected to the COM3 pin of the electronic expansion valve module, the A1 pin of the electronic expansion valve module, the A2 pin of the electronic expansion valve module, the B1 pin of the electronic expansion valve module and the B2 pin of the electronic expansion valve module are connected to the main electronic expansion valve, and the D- pin and D+ pin of the electronic expansion valve module are connected to the expansion unit.

[0023] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0024] The present invention has made improvements in three aspects. First, the control system of the unit has been greatly upgraded. Second, a small fan is used without changing the air volume, the number of fans is increased, and variable frequency operation is adopted. Third, the bottom box and the compressor are all sealed and silenced, and the distance between the box and the heat exchange fins is raised to facilitate air intake. After the above measures, the noise of the unit is reduced from 83 decibels to 60 decibels, meeting the user's requirements for noise, solving the problem of excessive noise generated by the air source heat pump unit, and achieving the low noise effect of the air source heat pump unit during heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present specific implementation or prior art, the following briefly introduces the drawings required for the specific implementation or prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0026] Figure 1 It is a schematic diagram of the system structure of the unit of the present invention;

[0027] Figure 2 This is a schematic diagram of a fan control module of the unit of the present invention;

[0028] Figure 3 The CPU unit schematic diagram of the PLC module of the unit of the present invention;

[0029] Figure 4 The schematic diagram of the SCM-16 analog module of the PLC module of the unit of the present invention;

[0030] Figure 5 The expansion module schematic diagram of the PLC module of the unit of the present invention;

[0031] Figure 6 The GRM202 module schematic diagram of the PLC module of the unit of the present invention;

[0032] Figure 7 This is a schematic diagram of the electronic expansion valve module of the PLC thermal control system of the unit of the present invention;

[0033] In the figure: 1-outdoor fan, 2-fin heat exchanger, 3-liquid storage tank, 4-compressor, 5-oil separator, 6-electronic expansion valve, 7-falling film heat exchanger, 8-air conditioning terminal. DETAILED DESCRIPTION

[0034] Examples, such as Figure 1 As shown, a -25°C ultra-low temperature noise-reducing screw air source heat pump unit includes a fin heat exchanger 2 and a falling film heat exchanger 7. An outdoor fan 1 is installed on one side of the fin heat exchanger 2, and the other side of the fin heat exchanger 2 is an air inlet. The fin heat exchanger 2 is connected to one end of an electronic expansion valve 6 and one end of a liquid reservoir 3. The other end of the liquid reservoir 3 is connected to one end of a compressor 4. The other end of the compressor 4 is connected to an oil separator 5. The other end of the electronic expansion valve 6 and the other end of the oil separator 5 are connected to a falling film heat exchanger 7. The other end of the falling film heat exchanger 7 is connected to an air conditioning terminal 8.

[0035] like Figure 2 As shown, a control system of a -25°C ultra-low temperature noise-reducing screw air source heat pump unit includes a fan control module, and the fan control module includes a phase-break phase sequence protector XJ3-D. The phase-break phase sequence protector XJ3-D is connected to the U line, V line and W line of the three-phase power line, and the U line, V line and W line of the three-phase power line are connected to one end of the circuit breaker QF1, and the other end of the circuit breaker QF1 is connected to one end of the circuit breaker QF2, one end of the circuit breaker QF3, one end of the circuit breaker QF4, one end of the contactor KM1 switch and one end of the contactor KM3 switch. The other end of the contactor KM1 switch is connected to one end of the thermal relay FR1, and the other end of the thermal relay FR1 is connected to one end of the compressor M1, and the other end of the compressor M1 is connected to the other end of the contactor KM3 switch and the contactor KM2 switch.

[0036] The other end of the circuit breaker QF2 is connected to the R, S and T pins of the frequency converter G1, the Dl1 pin of the frequency converter G1 is connected to the switch of the relay KA4, the Dl4 pin of the frequency converter G1 is connected to the switch of the relay KA6, the U, V and W pins of the frequency converter G1 are connected to one end of the thermal relay FR2, one end of the thermal relay FR3, one end of the thermal relay FR4 and one end of the thermal relay FR5, the other end of the thermal relay FR2 is connected to the 1# fan M2, the other end of the thermal relay FR3 is connected to the 2# fan M3, the other end of the thermal relay FR4 is connected to the 3# fan M4, and the other end of the thermal relay FR5 is connected to the 4# fan M5.

[0037] The other end of the circuit breaker QF3 is connected to the R, S and T pins of the inverter G2, the Dl1 pin of the inverter G2 is connected to the switch of the relay KA4, the Dl4 pin of the inverter G1 is connected to the switch of the relay KA6, the U, V and W pins of the inverter G2 are connected to one end of the thermal relay FR6, one end of the thermal relay FR7, one end of the thermal relay FR8 and one end of the thermal relay FR9, the other end of the thermal relay FR6 is connected to the 5# fan M6, the other end of the thermal relay FR7 is connected to the 6# fan M7, the other end of the thermal relay FR8 is connected to the 7# fan M8, and the other end of the thermal relay FR9 is connected to the 8# fan M9.

[0038] The other end of the circuit breaker QF4 is connected to one end of the contactor KM4, the other end of the contactor KM4 is connected to one end of the water tray heating resistor R1, one end of the water tray heating resistor R2 and one end of the water tray heating resistor R3, and the other ends of the water tray heating resistor R1, the other ends of the water tray heating resistor R2 and the other ends of the water tray heating resistor R3 are connected to the N line of the three-phase power line.

[0039] like Figure 3 As shown, the control system also includes a PLC module, the PLC module includes a CPU unit, the CPU unit includes a chip U1, the model of the chip U1 is SR60, the 1M pin of the Dla area of ​​the chip U1 is connected to the DC end of the power supply, the 4 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S1, and the other end of the switch S1 is connected to 24V, this part is used for low-voltage control of the compressor; the 5 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S2, and the other end of the switch S2 is connected to 24V, this part is used for high-voltage control of the compressor; the 5 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S2, and the other end of the switch S2 is connected to 24V, this part is used for high-voltage control of the compressor; the 6 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S3, and the other end of the switch S3 is connected to 24V, this part is used for overload control of the compressor; the 7 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S4, and the other end of the switch S4 is connected to 24V, this part is used for oil level switch control.

[0040] Pin 0 of the Dlb area of ​​the chip U1 is connected to one end of switch S5, and the other end of switch S5 is connected to 24V, and this part is used for oil pressure difference switch; pin 1 of the Dlb area of ​​the chip U1 is connected to one end of switch S6, and the other end of switch S6 is connected to 24V, and this part is used for PTC protection inside the machine; pin 4 of the Dlb area of ​​the chip U1 is connected to 24V, and this part is used for system phase sequence protection; pin 5 of the Dlb area of ​​the chip U1 is connected to one end of switch S7, and the other end of switch S7 is connected to 24V, and this part is used for water flow switch; pin 6 of the Dlb area of ​​the chip U1 is connected to one end of switch S8, and the other end of switch S8 is connected to 24V, and this part is used for circulating pump overload; pin 7 of the Dlb area of ​​the chip U1 is connected to one end of switch S9, and the other end of switch S9 is connected to 24V, and this part is used for remote switch.

[0041] Pin 0 of the Dlc area of ​​the chip U1 is connected to one end of the switch S10, and the other end of the switch S10 is connected to 24V, and this part is used for external alarm; pin 4 of the Dlc area of ​​the chip U1 is connected to 24V; pin 5 of the Dlc area of ​​the chip U1 is connected to one end of the switch S11, and the other end of the switch S11 is connected to 24V, and this part is used for condensing fan overload; pin 7 of the Dlc area of ​​the chip U1 is connected to one end of the switch S12, and the other end of the switch S12 is connected to 24V, and this part is used for phase sequence protection; pin L1 of the Die area of ​​the chip U1 is connected to the positive pole of the power supply, and pin N of the Die area of ​​the chip U1 is grounded.

[0042] The 1L pin, 2L pin and 3L pin of the DQa area of ​​the chip U1 are connected to the positive pole of the power supply, the 1 pin of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM4, and the other end of the coil of the contactor KM4 is grounded, and this part is a 25% solenoid valve; the 2 pin of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM5, and the other end of the coil of the contactor KM5 is grounded, and this part is a 50% solenoid valve; the 3 pin of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM6, and the other end of the coil of the contactor KM6 is grounded, This part is a 75% solenoid valve; pin 5 of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM7, and the other end of the coil of the contactor KM7 is grounded. This part is the intermediate relay KA9; pin 6 of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM8, and the other end of the coil of the contactor KM8 is grounded. This part is the intermediate relay KA10; pin 7 of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM9, and the other end of the coil of the contactor KM9 is grounded. This part is the intermediate relay KA11.

[0043] Pin 0 of the DQb area of ​​the chip U1 is connected to one end of the coil of contactor KM10, and the other end of the coil of contactor KM10 is grounded, and this part is the liquid injection solenoid valve; Pin 1 of the DQb area of ​​the chip U1 is connected to one end of the coil of contactor KM11, and the other end of the coil of contactor KM11 is grounded, and this part is the economizer valve; Pin 3 of the DQb area of ​​the chip U1 is connected to one end of the coil of contactor KM12, and the other end of the coil of contactor KM12 is grounded, and this part is the intermediate relay KA12 and the first speed of the condensing fan; Pin 4 of the DQb area of ​​the chip U1 is connected to one end of the bulb HL2, and the other end of the bulb HL2 is grounded, and this part is a fault indication; Pin 5 of the DQb area of ​​the chip U1 is connected to one end of the coil of contactor KM13, and the other end of the coil of contactor KM13 is grounded, and this part is a fault indication; Pin 4L of the DQb area of ​​the chip U1 is connected to the positive pole of the power supply.

[0044] The 5L pin and the 6L pin of the DQc area of ​​the chip U1 are connected to the positive pole of the power supply; the 1 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM14 and one end of the bulb HL3, and the other end of the coil of the contactor KM14 and the other end of the bulb HL3 are grounded, and this part is the intermediate relay KA13 and the circulation pump operation indication; the 2 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM15, and the other end of the coil of the contactor KM15 is grounded, and this part is used for water tray heating; the 3 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM16, and the other end of the coil of the contactor KM16 is grounded, and this part is used for the liquid circuit solenoid valve; the 6 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM17, and the other end of the coil of the contactor KM17 is grounded, and this part is used for the intermediate relay and the second speed of the condensing fan; the L+ pin of the chip U1 is connected to 24V, and the M pin of the chip U1 is grounded.

[0045] The CPU unit also includes an internal protection PTC, wherein the L1 pin of the internal protection PTC is connected to the U line of the three-phase line, the L2 pin of the internal protection PTC is connected to the V line of the three-phase line, the L3 pin of the internal protection PTC is connected to the W line of the three-phase line, the L pin of the internal protection PTC is connected to the L pin of the 220V power supply, the N pin of the internal protection PTC is connected to the N pin of the 220V power supply, the 1 pin of the internal protection PTC is connected to one end of resistor A, and the other end of resistor A is connected to the 2 pin of the internal protection PTC.

[0046] The CPU unit also includes a liquid-jet electromechanical module, an L pin of the liquid-jet electromechanical module is connected to an L pin of a 220V power supply, and an N pin of the liquid-jet electromechanical module is connected to an N pin of the 220V power supply.

[0047] The CPU unit further comprises an electronic oil level switch, wherein the L pin of the electronic oil level switch is connected to the L pin of the 220V power supply, and the N pin of the electronic oil level switch is connected to the N pin of the 220V power supply.

[0048] like Figure 4 As shown, the PLC module also includes an analog unit, which includes an SCM-16 analog module. Pin 11 of the SCM-16 analog module is connected to one end of a pressure gauge P1, and the other end of the pressure gauge P1 is connected to 24V, and this part is used to detect the suction pressure; pin 12 of the SCM-16 analog module is connected to one end of a pressure gauge P2, and the other end of the pressure gauge P2 is connected to 24V, and this part is used for the exhaust pressure; pin 13 of the SCM-16 analog module is connected to one end of a pressure gauge P3, and the other end of the pressure gauge P3 is connected to 24V, and this part is used for the medium pressure; pin 14 of the SCM-16 analog module is connected to one end of a pressure gauge P4, and the other end of the pressure gauge P4 is connected to 24V, and this part is used for the oil pressure; pin 15 of the SCM-16 analog module is connected to one end of a pressure gauge P5, and the other end of the pressure gauge P5 is connected to 24V, and this part is used for the dew point sensor.

[0049] The X0 pin of the SCM-16 analog module is connected to the 0 pin of the DIa area of ​​the chip U1, the X1 pin of the SCM-16 analog module is connected to the 1 pin of the DIa area of ​​the chip U1, the T1 pin of the SCM-16 analog module is connected to one end of the temperature sensor R11, and the other end of the temperature sensor R11 is connected to the COM pin, which is used for the outlet water temperature; the T2 pin of the SCM-16 analog module is connected to one end of the temperature sensor R12, and the other end of the temperature sensor R12 is connected to the COM pin, which is used for the return water temperature; the T3 pin of the SCM-16 analog module is connected to the temperature sensor R1 3, the other end of temperature sensor R13 is connected to COM pin, this part is used for exhaust temperature; T4 pin of SCM-16 analog module is connected to one end of temperature sensor R14, the other end of temperature sensor R14 is connected to COM pin, this part is used for fin temperature; T5 pin of SCM-16 analog module is connected to one end of temperature sensor R15, the other end of temperature sensor R15 is connected to COM pin, this part is used for press liquid spray temperature; T8 pin of SCM-16 analog module is connected to one end of temperature sensor R16, the other end of temperature sensor R16 is connected to COM pin, this part is used for ambient temperature.

[0050] like Figure 5 As shown, the PLC module also includes an expansion module unit, and the expansion module unit includes a 24VDC 1-pin of the expansion module DM200A connected to the V-pin of the switch electric eye, and a 24VDC 2-pin of the expansion module connected to the V+ pin of the switch electric eye.

[0051] like Figure 6As shown, the control system also includes a communication module, which includes a GRM202 communication terminal, the GRM202 communication terminal is connected to the expansion module unit, the 24VDC GND pin of the GRM202 communication terminal is connected to the V- pin of the switch electric eye, and the 24VDC VCC pin of the GRM202 communication terminal is connected to the V+ pin of the switch electric eye.

[0052] like Figure 7 As shown, the control system also includes an electronic expansion valve module, the model of the electronic expansion valve module is EKE1B, the COM1 pin of the electronic expansion valve module is connected to the 2 pin of the suction pressure sensor AKS32R, the +5V pin of the electronic expansion valve module is connected to the 1 pin of the suction pressure sensor AKS32R, the 3 pin of the suction pressure sensor AKS32R is connected to the AI3 pin of the electronic expansion valve module, the DI1 pin of the electronic expansion valve module is connected to one end of the switch KM1, the other end of the switch KM1 is connected to the COM2 end of the electronic expansion valve module, the AI2 pin of the electronic expansion valve module is connected to one end of the suction temperature sensor EKS221, the other end of the suction temperature sensor EKS221 is connected to the COM3 pin of the electronic expansion valve module, the A1 pin of the electronic expansion valve module, the A2 pin of the electronic expansion valve module, the B1 pin of the electronic expansion valve module and the B2 pin of the electronic expansion valve module are connected to the main electronic expansion valve, and the D- pin and D+ pin of the electronic expansion valve module are connected to the expansion unit.

[0053] The present invention adopts two improvements to achieve the effect of noise reduction:

[0054] 1. The fan adopts a small fan without changing the air volume, increases the number of fans, and adopts variable frequency operation;

[0055] 2. The bottom box and the compressor are all sealed and silenced, and the distance between the box and the heat exchange fins is raised to facilitate air intake.

[0056] like Figure 2 As shown, the fans are changed to small and multiple, and the inverter is used to control the start and stop and two-speed control. The high speed is used during the day and the low speed is used at night.

[0057] like Figure 4 As shown, a dew point sensor is added on the basis of the original control. During defrosting, the dew point temperature is limited. If it is higher than the ambient dew point temperature, defrosting will not be performed. In this way, defrosting is divided into sections according to time periods and fin temperatures to reduce the number of defrosting times, prevent ice accumulation at the bottom of the fins, and save energy. The fan is controlled by frequency conversion at two-stage speed. The fan is controlled by ambient temperature and time. The air volume of a single fan decreases and the motor power decreases. The number of fans is increased. When the air volume remains unchanged, frequency conversion is used to start and stop, which reduces noise. The fan speed is reduced when the ambient temperature is relatively high. At night, the fan compressor reduces its speed according to the required load, and the noise is lower.

[0058] The description of the present invention is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for particular uses.

Claims

1. A control system for a -25°C ultra-low temperature and noise-reducing screw air source heat pump unit, characterized in that: It includes a fan control module, a PLC module, a communication module and an electronic expansion valve module. The PLC module includes a CPU unit, an analog unit and an expansion module unit. The communication module and the electronic expansion valve module are connected to the PLC module. The fan control module includes a phase-loss phase sequence protector XJ3-D, which is connected to the U line, V line and W line of the three power lines, and the U line, V line and W line of the three power lines are connected to one end of the circuit breaker QF1, and the other end of the circuit breaker QF1 is connected to one end of the circuit breaker QF2, one end of the circuit breaker QF3, one end of the circuit breaker QF4, one end of the contactor KM1 switch and one end of the contactor KM3 switch, and the other end of the contactor KM1 switch is connected to one end of the thermal relay FR1, and the other end of the thermal relay FR1 is connected to one end of the compressor M1, and the other end of the compressor M1 is connected to the other end of the contactor KM3 switch and the contactor KM2 switch; The other end of the circuit breaker QF2 is connected to the R pin, S pin and T pin of the frequency converter G1, the Dl1 pin of the frequency converter G1 is connected to the switch of the relay KA4, the Dl4 pin of the frequency converter G1 is connected to the switch of the relay KA6, the U pin, V pin and W pin of the frequency converter G1 are connected to one end of the thermal relay FR2, one end of the thermal relay FR3, one end of the thermal relay FR4 and one end of the thermal relay FR5, the other end of the thermal relay FR2 is connected to the 1# fan M2, the other end of the thermal relay FR3 is connected to the 2# fan M3, the other end of the thermal relay FR4 is connected to the 3# fan M4, and the other end of the thermal relay FR5 is connected to the 4# fan M5; The other end of the circuit breaker QF3 is connected to the R pin, S pin and T pin of the frequency converter G2, the Dl1 pin of the frequency converter G2 is connected to the switch of the relay KA4, the Dl4 pin of the frequency converter G1 is connected to the switch of the relay KA6, the U pin, V pin and W pin of the frequency converter G2 are connected to one end of the thermal relay FR6, one end of the thermal relay FR7, one end of the thermal relay FR8 and one end of the thermal relay FR9, the other end of the thermal relay FR6 is connected to the 5# fan M6, the other end of the thermal relay FR7 is connected to the 6# fan M7, the other end of the thermal relay FR8 is connected to the 7# fan M8, and the other end of the thermal relay FR9 is connected to the 8# fan M9; The other end of the circuit breaker QF4 is connected to one end of the contactor KM4, the other end of the contactor KM4 is connected to one end of the water tray heating resistor R1, one end of the water tray heating resistor R2 and one end of the water tray heating resistor R3, the other end of the water tray heating resistor R1, the other end of the water tray heating resistor R2 and the other end of the water tray heating resistor R3 are connected to the N line of the three power lines; The analog quantity unit includes an SCM-16 analog quantity module, wherein the 11th pin of the SCM-16 analog quantity module is connected to one end of a pressure gauge P1, and the other end of the pressure gauge P1 is connected to 24V, and this part is used to detect the suction pressure; the 12th pin of the SCM-16 analog quantity module is connected to one end of a pressure gauge P2, and the other end of the pressure gauge P2 is connected to 24V, and this part is used for the exhaust pressure; the 13th pin of the SCM-16 analog quantity module is connected to one end of a pressure gauge P3, and the other end of the pressure gauge P3 is connected to 24V, and this part is used for the medium pressure; the 14th pin of the SCM-16 analog quantity module is connected to one end of a pressure gauge P4, and the other end of the pressure gauge P4 is connected to 24V, and this part is used for the oil pressure; the 15th pin of the SCM-16 analog quantity module is connected to one end of a pressure gauge P5, and the other end of the pressure gauge P5 is connected to 24V, and this part is used for the dew point sensor; The X0 pin of the SCM-16 analog module is connected to the 0 pin of the DIa area of ​​the chip U1, the X1 pin of the SCM-16 analog module is connected to the 1 pin of the DIa area of ​​the chip U1, the T1 pin of the SCM-16 analog module is connected to one end of the temperature sensor R11, and the other end of the temperature sensor R11 is connected to the COM pin, which is used for the outlet water temperature; the T2 pin of the SCM-16 analog module is connected to one end of the temperature sensor R12, and the other end of the temperature sensor R12 is connected to the COM pin, which is used for the return water temperature; the T3 pin of the SCM-16 analog module is connected to the temperature sensor R1 3, the other end of temperature sensor R13 is connected to COM pin, this part is used for exhaust temperature; T4 pin of SCM-16 analog module is connected to one end of temperature sensor R14, the other end of temperature sensor R14 is connected to COM pin, this part is used for fin temperature; T5 pin of SCM-16 analog module is connected to one end of temperature sensor R15, the other end of temperature sensor R15 is connected to COM pin, this part is used for press liquid spray temperature; T8 pin of SCM-16 analog module is connected to one end of temperature sensor R16, the other end of temperature sensor R16 is connected to COM pin, this part is used for ambient temperature; The CPU unit includes a chip U1, the model of the chip U1 is SR60, the 1M pin of the Dla area of ​​the chip U1 is connected to the DC end of the power supply, the 4 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S1, and the other end of the switch S1 is connected to 24V, and this part is used for low-voltage control of the compressor; the 5 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S2, and the other end of the switch S2 is connected to 24V, and this part is used for high-voltage control of the compressor; the 5 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S2, and the other end of the switch S2 is connected to 24V, and this part is used for high-voltage control of the compressor; the 6 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S3, and the other end of the switch S3 is connected to 24V, and this part is used for overload control of the compressor; the 7 pin of the Dla area of ​​the chip U1 is connected to one end of the switch S4, and the other end of the switch S4 is connected to 24V, and this part is used for oil level switch control; Pin 0 of the Dlb area of ​​the chip U1 is connected to one end of the switch S5, and the other end of the switch S5 is connected to 24V, and this part is used for the oil pressure difference switch; Pin 1 of the Dlb area of ​​the chip U1 is connected to one end of the switch S6, and the other end of the switch S6 is connected to 24V, and this part is used for the PTC protection in the machine; Pin 4 of the Dlb area of ​​the chip U1 is connected to 24V, and this part is used for the system phase sequence protection; Pin 5 of the Dlb area of ​​the chip U1 is connected to one end of the switch S7, and the other end of the switch S7 is connected to 24V, and this part is used for the water flow switch; Pin 6 of the Dlb area of ​​the chip U1 is connected to one end of the switch S8, and the other end of the switch S8 is connected to 24V, and this part is used for the overload of the circulating pump; Pin 7 of the Dlb area of ​​the chip U1 is connected to one end of the switch S9, and the other end of the switch S9 is connected to 24V, and this part is used for the remote switch; Pin 0 of the Dlc area of ​​the chip U1 is connected to one end of the switch S10, and the other end of the switch S10 is connected to 24V, which is used for external alarm; Pin 4 of the Dlc area of ​​the chip U1 is connected to 24V; Pin 5 of the Dlc area of ​​the chip U1 is connected to one end of the switch S11, and the other end of the switch S11 is connected to 24V, which is used for condensing fan overload; Pin 7 of the Dlc area of ​​the chip U1 is connected to one end of the switch S12, and the other end of the switch S12 is connected to 24V, which is used for phase sequence protection; Pin L1 of the Die area of ​​the chip U1 is connected to the positive pole of the power supply, and Pin N of the Die area of ​​the chip U1 is grounded; The 1L pin, 2L pin and 3L pin of the DQa area of ​​the chip U1 are connected to the positive pole of the power supply, the 1 pin of the DQa area of ​​the chip U1 is connected to one end of the coil of the contactor KM4, and the other end of the coil of the contactor KM4 is grounded. This part is a 25% solenoid valve; Pin 2 of the DQa area of ​​chip U1 is connected to one end of the coil of contactor KM5, and the other end of the coil of contactor KM5 is grounded. This part is a 50% solenoid valve; Pin 3 of the DQa area of ​​chip U1 is connected to one end of the coil of contactor KM6, and the other end of the coil of contactor KM6 is grounded. This part is a 75% solenoid valve; Pin 5 of the DQa area of ​​chip U1 is connected to one end of the coil of contactor KM7, and the other end of the coil of contactor KM7 is grounded. This part is the intermediate relay KA9; Pin 6 of the DQa area of ​​chip U1 is connected to one end of the coil of contactor KM8, and the other end of the coil of contactor KM8 is grounded. This part is the intermediate relay KA10; Pin 7 of the DQa area of ​​chip U1 is connected to one end of the coil of contactor KM9, and the other end of the coil of contactor KM9 is grounded. This part is the intermediate relay KA11; Pin 0 of the DQb region of the chip U1 is connected to one end of the coil of the contactor KM10, and the other end of the coil of the contactor KM10 is grounded. This part is a liquid spraying solenoid valve; Pin 1 of the DQb area of ​​chip U1 is connected to one end of the coil of contactor KM11, and the other end of the coil of contactor KM11 is grounded. This part is the economizer valve; Pin 3 of the DQb area of ​​chip U1 is connected to one end of the coil of contactor KM12, and the other end of the coil of contactor KM12 is grounded. This part is the intermediate relay KA12 and the first speed of the condensing fan; Pin 4 of the DQb area of ​​chip U1 is connected to one end of the bulb HL2, and the other end of the bulb HL2 is grounded. This part is a fault indication; Pin 5 of the DQb area of ​​chip U1 is connected to one end of the coil of contactor KM13, and the other end of the coil of contactor KM13 is grounded. This part is a fault indication; Pin 4L of the DQb area of ​​chip U1 is connected to the positive pole of the power supply; The 5L pin and the 6L pin of the DQc area of ​​the chip U1 are connected to the positive pole of the power supply; the 1 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM14 and one end of the bulb HL3, and the other end of the coil of the contactor KM14 and the other end of the bulb HL3 are grounded, and this part is the operation indication of the intermediate relay KA13 and the circulating pump; the 2 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM15, and the other end of the coil of the contactor KM15 is grounded, and this part is used for water pan heating; the 3 pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM16, and the other end of the coil of the contactor KM16 is grounded, and this part is used for the liquid circuit solenoid valve; The 6th pin of the DQc area of ​​the chip U1 is connected to one end of the coil of the contactor KM17, and the other end of the coil of the contactor KM17 is grounded. This part is used for the intermediate relay and the second speed of the condensing fan; the L+ pin of the chip U1 is connected to 24V, and the M pin of the chip U1 is grounded; The communication module includes a GRM202 communication terminal, the GRM202 communication terminal is connected to the expansion module unit, the 24VDC GND pin of the GRM202 communication terminal is connected to the V-pin of the switch electric eye, and the 24VDC VCC pin of the GRM202 communication terminal is connected to the V+ pin of the switch electric eye; The model of the electronic expansion valve module is EKE1B, the COM1 pin of the electronic expansion valve module is connected to the 2 pin of the suction pressure sensor AKS32R, the +5V pin of the electronic expansion valve module is connected to the 1 pin of the suction pressure sensor AKS32R, the 3 pin of the suction pressure sensor AKS32R is connected to the AI3 pin of the electronic expansion valve module, the DI1 pin of the electronic expansion valve module is connected to one end of the switch KM1, the other end of the switch KM1 is connected to the COM2 end of the electronic expansion valve module, the AI2 pin of the electronic expansion valve module is connected to one end of the suction temperature sensor EKS221, the other end of the suction temperature sensor EKS221 is connected to the COM3 pin of the electronic expansion valve module, the A1 pin of the electronic expansion valve module, the A2 pin of the electronic expansion valve module, the B1 pin of the electronic expansion valve module and the B2 pin of the electronic expansion valve module are connected to the main electronic expansion valve, and the D- pin and D+ pin of the electronic expansion valve module are connected to the expansion unit.

2. The control system of a -25°C ultra-low temperature and noise-reducing screw air source heat pump unit as claimed in claim 1, characterized in that: The CPU unit also includes an internal protection PTC, wherein the L1 pin of the internal protection PTC is connected to the U line of the three-phase line, the L2 pin of the internal protection PTC is connected to the V line of the three-phase line, the L3 pin of the internal protection PTC is connected to the W line of the three-phase line, the L pin of the internal protection PTC is connected to the L pin of the 220V power supply, the N pin of the internal protection PTC is connected to the N pin of the 220V power supply, the 1 pin of the internal protection PTC is connected to one end of a resistor A, and the other end of the resistor A is connected to the 2 pin of the internal protection PTC; The CPU unit also includes a liquid spray electromechanical module, the L pin of the liquid spray electromechanical module is connected to the L pin of the 220V power supply, and the N pin of the liquid spray electromechanical module is connected to the N pin of the 220V power supply; The CPU unit further comprises an electronic oil level switch, wherein the L pin of the electronic oil level switch is connected to the L pin of the 220V power supply, and the N pin of the electronic oil level switch is connected to the N pin of the 220V power supply.

Images