CN112082281A - Variable-frequency condensing unit controlled by temperature controller in communication mode and control method thereof - Google Patents

Abstract

The invention discloses a variable-frequency condensing unit controlled by a temperature controller in a communication manner and a control method thereof, and relates to the technical field of refrigeration equipment. The control method comprises parameter setting, real-time data acquisition, real-time data summarization, data comparison and judgment and instruction control. The frequency conversion condensing unit is controlled to work through the communication of the temperature controller, the frequent action of the frequency conversion controller is avoided, the maintenance frequency is avoided, and the refrigerating system under different working conditions can be adapted.

Description

Variable-frequency condensing unit controlled by temperature controller in communication mode and control method thereof

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to a variable-frequency condensing unit controlled by a temperature controller in a communication mode and a control method thereof.

Background

The refrigeration principle of the refrigerator is that a compressor compresses steam with lower pressure into steam with higher pressure, so that the volume of the steam is reduced, and the pressure is increased. The condensing unit is a device consisting of one or more electric motor-driven positive displacement refrigeration compressors for refrigeration, a condenser and necessary auxiliary equipment (without an evaporator and a throttling mechanism).

At present, the working principle of most variable frequency condensing units in the market is as follows: the frequency conversion condensing unit is judged after comparing a temperature value detected by the frequency conversion controller through the exhaust temperature sensor, the condensing temperature sensor and the environment temperature sensor with a program set temperature parameter value of a control panel on the frequency conversion controller, so as to control the actuation or the disconnection of a relay on the frequency conversion controller, thereby realizing the frequency conversion function of the condensing unit. But the variable frequency controller is factory-set parameter values by a manufacturer, and the values cannot be adjusted after being set; in addition, for the use conditions of different clients, the fixed parameter value enables the frequency conversion controller to act on the client frequently, and the after-sales service is frequent.

Disclosure of Invention

1. Technical problem to be solved by the invention

Aiming at the problem that fault maintenance is troublesome due to long-term work of a variable frequency controller, the invention provides a variable frequency condensing unit controlled by a temperature controller in a communication manner and a control method thereof.

2. Technical scheme

Therefore, the technical scheme adopted by the invention is as follows:

the utility model provides a frequency conversion condensation unit by temperature controller communication control, includes compressor, condenser, condensation fan, liquid storage pot, still includes frequency conversion controller, temperature sensor group and temperature controller, compressor, condenser, condensation fan, liquid storage pot connect gradually and constitute the pipeline system, the high pressure export of compressor with the condenser is connected, the low pressure export of compressor and the exit linkage of evaporimeter, frequency conversion controller one end with temperature controller one end is connected with the communication line, the frequency conversion controller other end passes through the pipe connection temperature sensor group, be provided with parameter control panel on the temperature controller. The temperature sensor group collects real-time temperature information, the real-time temperature information is sent and input into the variable frequency controller, the real-time information collected by the temperature sensor group is transmitted to the temperature controller through the communication line, real-time data are collected in the temperature controller, and the temperature controller can be operated to check each real-time temperature data. Through the control panel setting parameter on the temperature controller, carry out contrastive analysis with the real-time temperature data that comes through communication line signal transmission, the temperature controller makes the judgement to give the send instruction to frequency conversion controller through the communication line, control whether actuation of relay on the frequency conversion controller, and then realize the control to start and stop of condensation fan, the start and stop of compressor, the lift of compressor etc. realize condensing unit frequency conversion function.

Optionally, the temperature sensor group includes exhaust temperature sensor, ambient temperature sensor, condensation temperature sensor, exhaust temperature sensor, ambient temperature sensor, condensation temperature sensor one end respectively with frequency conversion controller one end is connected, the exhaust temperature sensor other end with the high pressure exit linkage of compressor, the ambient temperature sensor other end with the access connection of condenser, the exit linkage of condensation temperature sensor other end and condenser. The temperature of the outlet end of an exhaust port in the variable-frequency condensing unit is monitored and collected in real time through an exhaust temperature sensor, the temperature of the inlet end of a condenser is monitored and collected in real time through an environment temperature sensor, and the temperature of the outlet end of the condenser is monitored and collected in real time through a condensing temperature sensor.

Optionally, the outlet of the liquid storage tank is sequentially connected with a filter and a capillary tube for liquid injection, and the outlet of the capillary tube for liquid injection is connected with the low-pressure inlet of the compressor. The filtered fluid may be delivered to the low pressure inlet of the compressor by a liquid injection capillary tube.

Optionally, a flow valve is arranged on an outlet of the liquid storage tank and an inlet pipeline of the filter. The flow rate of the fluid in the reservoir tank into the filter is controlled by a flow valve.

Optionally, the outlet of the liquid storage tank is further connected with a high-low pressure controller, a high-pressure port of the high-low pressure controller is connected with the outlet of the liquid storage tank, a low-pressure port of the high-low pressure controller is connected with a liquid storage bottle, and the outlet of the liquid storage bottle is connected with a low-pressure inlet of the compressor.

Optionally, a check valve is arranged on the outlet of the liquid storage bottle and a low-pressure inlet pipeline of the compressor.

Optionally, an alarm device is arranged in the thermostat. The ambient temperature is automatically sampled and monitored in real time through the temperature sensor group, and when the ambient temperature is higher than a control set value, the control circuit is started, so that a control return difference can be set. When the temperature rises to a set overrun alarm temperature point, an alarm device in the temperature controller starts an overrun alarm function, and then sends an instruction to the variable frequency controller through the communication line to control the actuation of a relay on the variable frequency controller.

Alternatively, the liquid injection capillary is provided in a spiral thread shape. The capillary tube for liquid injection adopts a spiral thread shape, so that the space can be saved, and the pressure of high-pressure fluid flowing into a low-pressure inlet of the compressor can be relieved to a certain extent.

A method for controlling a temperature controller-controlled variable frequency condensing unit, the variable frequency condensing unit controlled by the temperature controller according to any one of the above items, comprising:

setting parameters: setting temperature parameters including an overrun alarm temperature point in a control panel on the temperature controller in advance;

acquiring real-time data: real-time temperature information is collected through the temperature sensor group and is sent and input into the variable frequency controller;

and (3) summarizing real-time data: the temperature sensor group collects real-time temperature data, transmits the real-time temperature data to the variable frequency controller, transmits the real-time temperature data to the temperature controller through a communication line, and collects the real-time data in the temperature controller, wherein the real-time data comprises temperature, running current and compressor frequency data;

and (3) data comparison and judgment: the temperature controller judges according to a comparison value by comparing preset temperature parameters in a control panel on the temperature controller with the real-time data gathered in the temperature controller, when the ambient temperature is higher than the set temperature parameter value, a control circuit is started, a control return difference is set, and when the temperature rises to a set over-limit alarm temperature point, an alarm device in the temperature controller starts an over-limit alarm function;

and (3) command control: and after the temperature controller judges according to the comparison value, the judgment result is output in a signal form, and a sending instruction is sent to the variable frequency controller through the communication line to control the actuation or disconnection of a relay on the variable frequency controller, so that the control on the start and stop of the condensing fan, the start and stop of the compressor and the frequency increase and decrease of the compressor is realized.

Optionally, the real-time temperature information collected by the temperature sensor group includes a compressor exhaust outlet end temperature, a condenser inlet end temperature, and a condenser outlet end temperature.

By applying the technical scheme of the invention, before the condensing unit works, the parameter setting is carried out through the control panel on the temperature controller, the overrun alarm temperature point is preset, the temperature of the outlet end of the exhaust port of the compressor in the variable-frequency condensing unit is monitored and collected in real time through the exhaust temperature sensor, the temperature of the inlet end of the condenser is monitored and collected in real time through the ambient temperature sensor, the temperature of the outlet end of the condenser is monitored and collected in real time through the condensing temperature sensor, the real-time temperature information collected by the temperature sensor group is sent and input into the variable-frequency controller and is transmitted to the temperature controller through the communication line, the real-time data including the temperature, the running current, the compressor frequency and the like are collected in the temperature controller, and the. The parameter is preset through the control panel on the temperature controller, carry out contrastive analysis with the real-time temperature data that comes through communication line signal transmission, the temperature controller monitors and can make the judgement, control circuit starts when ambient temperature is higher than the temperature parameter value that control was set for, can set up the control return difference, when the temperature rose to the transfinite alarm temperature point of settlement, alarm device in the temperature controller starts transfinite alarming function, will judge the result and export with the signal form, and assign the send instruction to frequency conversion controller through the communication line, the last relay actuation or the disconnection of control frequency conversion controller, and then realize the start-stop to the condensation fan, the start-stop of compressor, the control of the rising and falling frequency etc. of compressor, realize condensing unit frequency conversion function. Different parameters are set on the temperature controller control panel, so that the variable-frequency condensing unit is suitable for the refrigerating systems under different working conditions. In this embodiment, the communication line is a communication line commonly used in the prior art. The alarm device is the alarm device in the prior art.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) according to the embodiment of the invention, the temperature controller with a communication control function is adopted to control the frequency conversion condensing unit to work, so that frequent actions of the frequency conversion controller and frequent after-sale service are avoided;

(2) in the embodiment of the invention, real-time operation data including the air suction and exhaust temperature of the condensing unit, the operation current, the compressor frequency and the like can be checked through the temperature controller;

(3) in the embodiment of the invention, the action values of the relays with the protection functions can be set through the temperature controller, so that the method is simple, quick and convenient;

(4) the temperature controller parameter values can be set according to different use requirements of customers so as to adapt to the refrigeration systems under different working conditions.

Drawings

Fig. 1 is a schematic structural diagram of a variable frequency condensing unit controlled by a temperature controller in communication according to an embodiment of the present invention;

fig. 2 is a schematic view of a connection structure between a temperature controller and a variable-frequency condensing unit according to an embodiment of the present invention.

The symbols in the drawings illustrate that:

1. a compressor; 2. a condenser; 3. a condensing fan; 4. a liquid storage tank; 5. a variable frequency controller; 6. a group of temperature sensors; 61. an exhaust gas temperature sensor; 62. an ambient temperature sensor; 63. a condensation temperature sensor; 7. a communication line; 8. a temperature controller; 9. a liquid storage bottle; 10. a one-way valve; 11. a filter; 12. a high and low pressure controller; 13. a capillary for liquid injection; 14. a flow valve; 15. and an alarm device.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

Example 1

Combine fig. 1, fig. 2 to show, this embodiment provides a frequency conversion condensation unit by temperature controller communication control, including compressor 1, condenser 2, condensation fan 3 and liquid storage pot 4, still include frequency conversion controller 5, temperature sensor group 6 and temperature controller 8, compressor 1, condenser 2, condensation fan 3, liquid storage pot 4 connect gradually and constitute the pipeline system, the high pressure export of compressor 1 with condenser 2 is connected, the low pressure export of compressor 1 and the exit linkage of evaporimeter 5, frequency conversion controller 5 one end with 8 one end of temperature controller is connected with communication line 7, 5 other ends of frequency conversion controller pass through pipeline connection temperature sensor group 6, be provided with parameter control panel on the temperature controller 8.

The temperature sensor group 6 collects real-time temperature information, sends and inputs the real-time temperature information into the variable frequency controller 5, transmits the real-time temperature information collected by the temperature sensor group 6 to the temperature controller 8 through the communication line 7, collects real-time data including temperature, running current, compressor frequency and the like in the temperature controller 8, and can operate the temperature controller 8 to check the data of each real-time temperature, running current, compressor frequency and the like. Through the control panel setting parameter on the temperature controller 8, carry out contrastive analysis with the real-time temperature data that comes through communication line 7 signal transmission, temperature controller 8 makes the judgement, export the judged result with the signal form, and assign the send instruction to inverter controller 5 through communication line 7, control inverter controller 5 is gone up the relay and is whether the actuation, and then realize the start-stop to condensation fan 3, start-stop of compressor 1, the control of compressor 1's rising and falling frequency etc, realize condensing unit frequency conversion function. In this embodiment, the communication line 7 is a communication line commonly used in the prior art.

Example 2

Example 2 is further optimized based on example 1, and the specific implementation scheme is as follows:

as shown in fig. 1 and 2, this embodiment provides a frequency conversion condensation unit by temperature controller communication control, including compressor 1, condenser 2, condensation fan 3 and liquid storage pot 4, still include frequency conversion controller 5, temperature sensor group 6 and temperature controller 8, compressor 1, condenser 2, condensation fan 3, liquid storage pot 4 connect gradually and constitute the pipeline system, the high pressure export of compressor 1 with condenser 2 is connected, the low pressure export of compressor 1 and the exit linkage of evaporimeter 5, frequency conversion controller 5 one end with 8 one end of temperature controller is connected with communication line 7, the 5 other end of frequency conversion controller passes through pipe connection temperature sensor group 6, be provided with parameter control panel on the temperature controller 8. Temperature sensor group 6 includes exhaust temperature sensor 61, ambient temperature sensor 62, condensation temperature sensor 63, exhaust temperature sensor 61, ambient temperature sensor 62, condensation temperature sensor 63 one end respectively with inverter controller 5 one end is connected, the exhaust temperature sensor 61 other end with the high pressure exit linkage of compressor 1, the ambient temperature sensor 62 other end with the access connection of condenser 2, the exit linkage of the condensation temperature sensor 63 other end and condenser 2. And an alarm device 15 is arranged in the temperature controller 8.

Before the work, carry out parameter setting through the control panel on the temperature controller 8, preset transfinites alarm temperature point, gather 1 gas vent outlet end temperature of compressor in the frequency conversion condensing unit through exhaust temperature sensor 61 real-time supervision, gather 2 entrance point temperatures of condenser through ambient temperature sensor 62 real-time supervision, gather 2 exit end temperatures of condenser through condensation temperature sensor 63 real-time supervision, the real-time temperature information that temperature sensor group 6 gathered sends in the lump and inputs frequency conversion controller 5, and transmit for temperature controller 8 through communication line 7, and assemble real-time data in temperature controller 8, including the temperature, the operating current, data such as compressor frequency, each real-time temperature data is looked over to workable temperature controller. Through the control panel on the temperature controller 8 presets the parameter, carry out contrastive analysis with the real-time temperature data that comes through communication line 7 signal transmission, temperature controller 8 monitors and can make the judgement, control circuit starts when ambient temperature is higher than the temperature parameter value that control set for, can set up the control return difference, when the temperature rises to the transfinite alarm temperature point of settlement, alarm device 15 in the temperature controller 8 starts transfinite alarming function, will judge the result and export with the signal form, and assign the send instruction to inverter controller 5 through communication line 7, control inverter controller 5 and go up the relay actuation or disconnection, and then realize the start-stop to condensing fan 3, start-stop of compressor 1, the control of the rising and falling frequency etc. of compressor 1, realize condensing unit frequency conversion function. Different parameters are set on a control panel through a temperature controller 8, so that the variable-frequency condensing unit is suitable for refrigerating systems under different working conditions.

Example 3

Example 3 is further optimized based on example 2, and the specific implementation scheme is as follows:

as shown in fig. 1, this embodiment provides a frequency conversion condensation unit by temperature controller communication control, including compressor 1, condenser 2, condensation fan 3 and liquid storage pot 4, still include frequency conversion controller 5, temperature sensor group 6 and temperature controller 8, compressor 1, condenser 2, condensation fan 3, liquid storage pot 4 connect gradually and constitute the pipeline system, the high pressure outlet of compressor 1 with condenser 2 is connected, the low pressure export of compressor 1 and the exit linkage of evaporimeter 5, frequency conversion controller 5 one end with 8 one end of temperature controller is connected with communication line 7, the 5 other end of frequency conversion controller passes through pipeline connection temperature sensor group 6, be provided with parameter control panel on the temperature controller 8. Temperature sensor group 6 includes exhaust temperature sensor 61, ambient temperature sensor 62, condensation temperature sensor 63, exhaust temperature sensor 61, ambient temperature sensor 62, condensation temperature sensor 63 one end respectively with inverter controller 5 one end is connected, the exhaust temperature sensor 61 other end with the high pressure exit linkage of compressor 1, the ambient temperature sensor 62 other end with the access connection of condenser 2, the exit linkage of the condensation temperature sensor 63 other end and condenser 2. The outlet of the liquid storage tank 4 is sequentially connected with a filter 11 and a capillary tube 13 for liquid injection, and the outlet of the capillary tube 13 for liquid injection is connected with the inlet of the compressor 1. A flow valve 14 is arranged on the inlet pipeline between the outlet of the liquid storage tank 4 and the filter 11. The liquid injection capillary 13 is provided in a spiral thread shape. And an alarm device 15 is arranged in the temperature controller 8.

Can filter the impurity in the high-pressure liquid after condenser 2 condensation through filter 11, the interior fluid of liquid storage pot 4 is through filter 11's filtration back, flows into liquid and pours into and use capillary 13, and liquid pours into and uses capillary 13 and adopt spiral screw thread form can save space, can alleviate high-pressure fluid to a certain extent and flow into the intraoral pressure of compressor 1 low pressure, further carry the low pressure import of compressor 1 with liquid, realize refrigeration cycle. The flow of fluid from the reservoir 4 to the filter 11 is controlled by a flow valve 14.

Example 4

Example 4 is further optimized based on example 3, and the specific implementation scheme is as follows:

as shown in fig. 1, this embodiment provides a frequency conversion condensation unit by temperature controller communication control, including compressor 1, condenser 2, condensation fan 3 and liquid storage pot 4, still include frequency conversion controller 5, temperature sensor group 6 and temperature controller 8, compressor 1, condenser 2, condensation fan 3, liquid storage pot 4 connect gradually and constitute the pipeline system, the high pressure outlet of compressor 1 with condenser 2 is connected, the low pressure export of compressor 1 and the exit linkage of evaporimeter 5, frequency conversion controller 5 one end with 8 one end of temperature controller is connected with communication line 7, the 5 other end of frequency conversion controller passes through pipeline connection temperature sensor group 6, be provided with parameter control panel on the temperature controller 8. Temperature sensor group 6 includes exhaust temperature sensor 61, ambient temperature sensor 62, condensation temperature sensor 63, exhaust temperature sensor 61, ambient temperature sensor 62, condensation temperature sensor 63 one end respectively with inverter controller 5 one end is connected, the exhaust temperature sensor 61 other end with the high pressure exit linkage of compressor 1, the ambient temperature sensor 62 other end with the access connection of condenser 2, the exit linkage of the condensation temperature sensor 63 other end and condenser 2. The outlet of the liquid storage tank 4 is sequentially connected with a filter 11 and a capillary tube 13 for liquid injection, and the outlet of the capillary tube 13 for liquid injection is connected with the low-pressure inlet of the compressor 1. A flow valve 14 is arranged on the inlet pipeline between the outlet of the liquid storage tank 4 and the filter 11. The outlet of the liquid storage tank 4 is also connected with a high-low pressure controller 12, the high pressure port of the high-low pressure controller 12 is connected with the outlet of the liquid storage tank 4, the low pressure port of the high-low pressure controller 12 is connected with a liquid storage bottle 9, and the outlet of the liquid storage bottle 9 is connected with the low-pressure inlet of the compressor 1. And a low-pressure one-way valve 10 is arranged on an outlet of the liquid storage bottle 9 and a low-pressure inlet pipeline of the compressor 1. And an alarm device 15 is arranged in the temperature controller 8. The liquid injection capillary 13 is provided in a spiral thread shape.

The compressor 1 compresses the lower steam of pressure into higher steam, make the steam volume reduce, pressure rising, high-pressure gas turns into liquid after entering the condenser 2, liquid flows into the liquid storage pot 4, because the liquid pressure that enters into the liquid storage pot 4 is higher, need reduce pressure through high-low pressure controller 12, liquid becomes gaseous, low-pressure gas gets into from compressor 1 low pressure import, compress into high-pressure gas through compressor 1 again, realize the circulation of above-mentioned process, realize the safe operation of the whole device of condensing unit from this, and then improve compression efficiency and refrigeration performance. The low pressure check valve 10 can prevent the refrigerant heat of the compressor 1 from flowing into the condenser 2 when the machine is stopped.

Example 5

As shown in fig. 1 and fig. 2, this embodiment provides a method for controlling a variable frequency condensing unit by a temperature controller, where the variable frequency condensing unit controlled by the temperature controller in communication according to any one of technical solutions of embodiments 1 to 4 includes:

setting parameters: presetting temperature parameters including an overrun alarm temperature point in a control panel on the temperature controller 8; different parameters are set on a control panel through a temperature controller 8, so that the variable-frequency condensing unit can adapt to refrigeration systems under different working conditions;

acquiring real-time data: real-time temperature information is collected through the temperature sensor group 6 and is sent and input into the variable frequency controller 5;

and (3) summarizing real-time data: the temperature sensor group 6 collects real-time temperature data, transmits the real-time temperature data to the variable frequency controller 5, transmits the real-time temperature data to the temperature controller 8 through the communication line 7, and collects the real-time data in the temperature controller 8, wherein the real-time data comprises temperature, running current and frequency data of the compressor 1;

and (3) data comparison and judgment: the preset temperature parameter in the control panel on the temperature controller 8 is compared with the real-time data gathered in the temperature controller 8, the temperature controller 8 judges according to the comparison value, when the environmental temperature is higher than the control set temperature parameter value, the control circuit is started, the control return difference is set, and when the temperature rises to the set over-limit alarm temperature point, the alarm device 15 in the temperature controller 8 starts the over-limit alarm function;

and (3) command control: and after the temperature controller 8 judges according to the comparison value, the judgment result is output in a signal form, a sending instruction is sent to the variable frequency controller 5 through the communication line 7, and the actuation or disconnection of a relay on the variable frequency controller 5 is controlled, so that the control on the start and stop of the condensing fan 3, the start and stop of the compressor 1 and the frequency increase and decrease of the compressor 1 is realized. The frequency conversion function of the condensing unit is realized. The real-time temperature information collected by the temperature sensor group 6 comprises the outlet end temperature of the air outlet of the compressor 1, the inlet end temperature of the condenser 2 and the outlet end temperature of the condenser 2.

The working principle is as follows: before condensing unit work, carry out parameter setting through the control panel on the temperature controller 8, preset transfinites warning temperature point, gather 1 gas vent outlet end temperature of compressor in the frequency conversion condensing unit through exhaust temperature sensor 61 real-time supervision, gather 2 entrance point temperatures of condenser through ambient temperature sensor 62 real-time supervision, gather 2 exit end temperatures of condenser through condensation temperature sensor 63 real-time supervision, the real-time temperature information that temperature sensor group 6 gathered sends in the lump and inputs frequency conversion controller 5, and transmit for temperature controller 8 through communication line 7, and converge real-time data in temperature controller 8, including the temperature, the operating current, data such as compressor frequency, each real-time temperature data is looked over to the operatable temperature controller. Parameters are preset through a control panel on the temperature controller 8, the parameters are contrastively analyzed with real-time temperature data transmitted through a communication line 7, the temperature controller 8 monitors and judges according to contrast values, when the ambient temperature is higher than a temperature parameter value set by control, a control circuit is started, a control return difference can be set, when the temperature rises to a set over-limit alarm temperature point, an alarm device 15 in the temperature controller 8 starts an over-limit alarm function, a judgment result is output in a signal form, a sending instruction is issued to the variable frequency controller 5 through the communication line 7, the actuation or disconnection of a relay on the variable frequency controller 5 is controlled, the starting and stopping of the condensing fan 3 are realized, the starting and stopping of the compressor 1 are realized, the frequency increasing and decreasing of the compressor 1 are controlled, and the frequency conversion function of the condensing unit is realized. Different parameters are set on a control panel through a temperature controller 8, so that the variable-frequency condensing unit is suitable for refrigerating systems under different working conditions.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (10)

1. The utility model provides a frequency conversion condensation unit by temperature controller communication control, includes compressor, condenser, condensation fan, liquid storage pot, its characterized in that still includes frequency conversion controller, temperature sensor group and temperature controller, compressor, condenser, condensation fan, liquid storage pot connect gradually and constitute the pipeline system, the high pressure export of compressor with the condenser is connected, the low pressure export of compressor and the exit linkage of evaporimeter, frequency conversion controller one end with temperature controller one end is connected with the communication line, the frequency conversion controller other end passes through the pipe connection temperature sensor group, be provided with parameter control panel on the temperature controller.

2. The variable-frequency condensing unit controlled by the temperature controller in a communication manner according to claim 1, wherein the temperature sensor set comprises an exhaust temperature sensor, an ambient temperature sensor and a condensing temperature sensor, one end of the exhaust temperature sensor, one end of the ambient temperature sensor and one end of the condensing temperature sensor are respectively connected with one end of the variable-frequency controller, the other end of the exhaust temperature sensor is connected with a high-pressure outlet of the compressor, the other end of the ambient temperature sensor is connected with an inlet of the condenser, and the other end of the condensing temperature sensor is connected with an outlet of the condenser.

3. The variable-frequency condensing unit controlled by the communication of the temperature controller as claimed in claim 1, wherein the outlet of the liquid storage tank is connected with a filter and a capillary tube for liquid injection in sequence, and the outlet of the capillary tube for liquid injection is connected with the low-pressure inlet of the compressor.

4. The variable-frequency condensing unit controlled by the communication of the temperature controller as claimed in claim 3, wherein the outlet of the liquid storage tank and the inlet pipeline of the filter are provided with flow valves.

5. The frequency conversion condensing unit controlled by the communication of the temperature controller according to claim 1, wherein the outlet of the liquid storage tank is further connected with a high-low pressure controller, the high pressure port of the high-low pressure controller is connected with the outlet of the liquid storage tank, the low pressure port of the high-low pressure controller is connected with a liquid storage bottle, and the outlet of the liquid storage bottle is connected with the low pressure inlet of the compressor.

6. The variable-frequency condensing unit controlled by the communication of the temperature controller as claimed in claim 5, wherein the outlet of the liquid storage bottle and the low-pressure inlet pipeline of the compressor are provided with low-pressure check valves.

7. The variable-frequency condensing unit controlled by the communication of the temperature controller according to claim 1, wherein an alarm device is provided in the temperature controller.

8. The variable-frequency condensing unit controlled by the temperature controller in communication according to claim 3, wherein the capillary tube for liquid injection is arranged in a spiral thread shape.

9. A method for controlling a temperature controller to control a variable frequency condensing unit in communication, wherein the variable frequency condensing unit in communication with the temperature controller according to any one of claims 1 to 8 comprises:

setting parameters: setting temperature parameters including an overrun alarm temperature point in a control panel on the temperature controller in advance;

acquiring real-time data: real-time temperature information is collected through the temperature sensor group and is sent and input into the variable frequency controller;

and (3) summarizing real-time data: the temperature sensor group collects real-time temperature data, transmits the real-time temperature data to the variable frequency controller, transmits the real-time temperature data to the temperature controller through a communication line, and collects the real-time data in the temperature controller, wherein the real-time data comprises temperature, running current and compressor frequency data;

and (3) data comparison and judgment: the temperature controller judges according to a comparison value by comparing preset temperature parameters in a control panel on the temperature controller with the real-time data gathered in the temperature controller, when the ambient temperature is higher than the set temperature parameter value, a control circuit is started, a control return difference is set, and when the temperature rises to a set over-limit alarm temperature point, an alarm device in the temperature controller starts an over-limit alarm function;

and (3) command control: and after the temperature controller judges according to the comparison value, the judgment result is output in a signal form, and a sending instruction is sent to the variable frequency controller through the communication line to control the actuation or disconnection of a relay on the variable frequency controller, so that the control on the start and stop of the condensing fan, the start and stop of the compressor and the frequency increase and decrease of the compressor is realized.

10. The method as claimed in claim 9, wherein the real-time temperature information collected by the temperature sensor group includes a compressor discharge outlet temperature, a condenser inlet temperature, and a condenser outlet temperature.

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