CN219344973U - Intelligent energy-saving control system of compressor - Google Patents

Abstract

The utility model discloses an intelligent energy-saving control system of a compressor, which belongs to the technical field of compressor manufacturing and solves the technical problems that in the prior art, the oil injection quantity of the compressor is solidified, so that the oil injection quantity is insufficient under a high-temperature working condition, the exhaust temperature of a host is too high, the service life of lubricating oil is shortened, the oil injection quantity is too large under a low-temperature working condition, the power consumption of the compressor is increased, and the service performance of the compressor is influenced; the first temperature sensor monitors the exhaust temperature of the host and feeds back the exhaust temperature to the controller, compares the exhaust temperature of the host with the target temperature, outputs a control signal to the electric regulating valve, and adjusts the opening angle of the electric regulating valve so as to adjust the oil return quantity conveyed back to the host by the oil return pipeline, so that the oil injection quantity is at the optimal point of the current working condition, and the exhaust temperature of the host always surrounds the target temperature.

Description

Intelligent energy-saving control system of compressor

Technical Field

The utility model belongs to the technical field of compressor manufacturing, and particularly relates to an intelligent energy-saving control system of a compressor.

Background

Compressors are well known for use primarily in the aerodynamic field for driving various pneumatic tools. Lubricating oil is arranged in the oil injection screw compressor, and the lubricating oil mainly has four functions of cooling, sealing, lubricating and noise reduction. In the process of compressing air, lubricating oil is continuously sprayed into a main machine, the main machine is cooled to take away compression heat, bearings in the main machine are lubricated, gaps in the main machine are sealed, compression efficiency is improved, and unit operation noise is reduced.

However, the current oil-injected screw compressors still have the following problems: 1. the conventional compressor is solidified in oil injection quantity, only can adapt to a certain specific working condition after being determined during factory debugging, cannot timely adjust the oil injection quantity according to actual use working conditions, particularly when the compressor is operated in a low-temperature environment, the compressor is extra large in power consumption, energy is wasted, the environment is not protected, complex and changeable environment working conditions cannot be considered, and the universality and the flexibility are poor;

2. the conventional oil injection screw compressor has the defects that the oil injection quantity is fixed, the exhaust temperature is sometimes too high, the exhaust temperature is sometimes too low, and the high-temperature and low-temperature use working conditions cannot be well considered. When the ambient temperature is high, the exhaust temperature of the host machine is correspondingly increased, for example, when the intake temperature is too high in summer, the exhaust temperature alarm or the shutdown is possibly influenced, the normal operation of the compressor is influenced, and when the exhaust temperature is too high, the serious problems of easy carbon deposition, coking and the like of the lubricating oil are also accelerated, the service life of the lubricating oil is shortened; when the ambient temperature is low, the exhaust temperature is correspondingly reduced, for example, when the air inlet temperature is too low in winter, the exhaust low temperature can not be adjusted due to solidification of the fuel injection quantity, and in the extreme case, when the exhaust temperature is lower than the pressure dew point, water can be separated out, so that the lubricating oil is emulsified, the quality of the lubricating oil is deteriorated,

can not realize the functions of lubrication and cooling. Meanwhile, the oil injection quantity is too large, so that the compression work of the compressor on oil and the oil stirring power consumption are increased, energy is wasted, and the energy conservation and the environmental protection are not realized.

Therefore, the oil injection quantity of the compressor has a direct influence on the power consumption of the compressor, and particularly when the pipeline pressure loss, the system pressure loss, the part pressure loss and the like of the compressor are limited in a smaller pressure loss range, if the oil injection quantity of the compressor can be accurately controlled, the oil injection quantity of the compressor plays a critical role in improving the energy efficiency.

In view of this, the present utility model has been made.

Disclosure of Invention

The utility model aims to provide an intelligent energy-saving control system of a compressor, which aims to solve the technical problems that in the prior art, the oil injection quantity of the compressor is solidified, so that the compressor has larger power consumption in running in a low-temperature environment, energy is wasted, the exhaust temperature in a high-temperature environment is too high, lubricating oil is easy to coke and carbon deposit, the service life of the lubricating oil is shortened, and the service performance of the compressor is influenced; the preferred technical solutions of the technical solutions provided by the present utility model can produce a plurality of technical effects described below.

In order to achieve the above purpose, the intelligent energy-saving control system of the compressor provided by the utility model comprises an air inlet unit, a motor, a host, an oil cylinder, a heat exchange unit, a parameter acquisition unit, a pipeline unit, an oil return amount control unit and a controller; the air inlet unit and the motor are respectively connected with the host; the parameter acquisition unit comprises a first temperature sensor which is arranged on the oil-gas mixing pipeline and is used for monitoring the exhaust temperature of the host; the parameter acquisition unit and the oil return amount control unit are respectively and electrically connected with the controller; the pipeline unit comprises an oil circuit pipeline, the oil circuit pipeline comprises an oil-gas mixture pipeline and an oil return pipeline, the host is connected with the oil return pipeline sequentially through the oil-gas mixture pipeline, the oil-gas cylinder and the oil return pipeline, and the oil return pipeline is connected with the host to form a closed-loop oil circuit; the oil return quantity control unit comprises an electric regulating valve arranged on an oil return pipeline; the heat exchange unit comprises an oil heat exchanger for cooling the oil return temperature of the oil return pipeline; the controller determines the current exhaust compressed air dew point temperature of the host through the parameter acquisition unit, the controller presets the target temperature of the host, the target temperature is higher than the compressed air dew point temperature, the first temperature sensor monitors the real-time exhaust temperature of the host and feeds back to the controller, the controller compares the target temperature with the real-time exhaust temperature, the controller outputs a control signal to the electric regulating valve, and the oil injection quantity is reduced or increased by regulating the opening angle of the electric regulating valve so as to regulate the oil return quantity conveyed back to the host by the oil return pipeline.

Preferably, a target temperature of the host is preset in the controller, the target temperature is higher than the dew point temperature of the compressed air and lower than 105 ℃, the first temperature sensor monitors the real-time exhaust temperature of the host and feeds back to the controller, and the controller outputs a 4-20 mA control signal to the electric regulating valve so as to regulate the opening angle of the electric regulating valve and regulate the oil return quantity fed back to the host by the oil return pipeline; when the first temperature sensor monitors that the exhaust temperature of the host is higher than the target temperature, the controller controls to increase the opening angle of the electric regulating valve and increase the return oil quantity conveyed by the return oil pipeline back to the host; when the exhaust temperature of the host is lower than or equal to the target temperature, the controller controls to reduce the opening angle of the electric regulating valve and reduce the return oil quantity conveyed by the return oil pipeline back to the host;

preferably, the electric regulating valve adopts an electric intelligent regulating ball valve, and the model is a Q911F-16-DN25 normally open valve;

preferably, the parameter acquisition unit further comprises a second temperature sensor for monitoring the air inlet temperature of the host, a pressure sensor for monitoring the exhaust pressure of the host and a humidity sensor for monitoring the ambient humidity of the host, wherein the second temperature sensor is arranged on the air inlet unit, the pressure sensor is arranged on the oil return pipeline, the humidity sensor is arranged at the air inlet end of the host, and the second temperature sensor, the pressure sensor and the humidity sensor are all electrically connected with the controller; the controller monitors the air inlet temperature, the air outlet pressure and the ambient humidity of the current host computer through a second temperature sensor, a pressure sensor and a humidity sensor to determine the dew point temperature of the compressed air under the current working condition of the host computer;

preferably, the oil return pipeline further comprises a temperature control valve and an oil filter, wherein the temperature control valve is provided with a first outlet and a second outlet, and the first outlet of the temperature control valve is connected with the host through the oil filter and the electric regulating valve in sequence; the second outlet of the temperature control valve is connected with the host through an oil heat exchanger, an oil filter and an electric regulating valve in sequence; when the oil temperature at the oil inlet of the temperature control valve is higher than the preset temperature of the temperature control valve, the temperature control valve opens a second outlet;

preferably, the pipeline unit further comprises an air source air path, the air source air path comprises a first air source air path, a second air source air path and a third air source air path, the oil-gas cylinder is connected with the host through the first air source air path, and the first air source air path is provided with a check valve for supplementing air; the oil-gas cylinder is connected with the host through a second air source air path, and an air release valve for releasing the internal pressure is arranged on the second air source air path; the air inlet unit is connected with the host through a third air source air path, and a differential pressure transmitter and an air inlet valve are sequentially arranged on the third air source air path from the air inlet direction to the air outlet direction; the check valve, the blow-off valve, the differential pressure signal generator and the air inlet valve are all electrically connected with the controller;

preferably, the device further comprises a fourth air source air path for controlling the opening angle of the air inlet valve, wherein the fourth air source air path is sequentially provided with an air-liquid separator, an electromagnetic valve and a capacity regulating valve from the air inlet direction to the air outlet direction; the air source exhausted by the exhaust pipe of the oil-gas cylinder is connected with the air inlet of the air inlet valve through the air-liquid separator, the electromagnetic valve and the capacity regulating valve in sequence; the electromagnetic valve and the capacity regulating valve are electrically connected with the controller;

preferably, the upper part of the oil-gas cylinder is provided with an oil-gas separator core for separating oil mist, and lubricating oil deposited at the bottom of the oil-gas separator core is connected with a host machine through an oil pumping pipeline;

preferably, the heat exchange unit further comprises a gas heat exchanger for cooling an exhaust temperature of the gas passing through the oil cylinder, the gas heat exchanger being connected to the oil heat exchanger through a cooling water pipe.

The intelligent energy-saving control system of the compressor provided by the utility model has the following beneficial effects:

the utility model effectively solves the problems of insufficient oil injection quantity and overhigh exhaust temperature of a main engine in the high-temperature working condition caused by solidification of the oil injection quantity of the compressor in the prior art, shortens the service life of lubricating oil, and increases the power consumption of the compressor due to overhigh oil injection quantity in the low-temperature working condition. And the service performance of the compressor is affected. The utility model sequentially communicates with a host machine, an oil-gas mixture pipeline, an oil cylinder, an oil return pipeline and the host machine to form a closed loop, wherein the oil return pipeline is provided with an electric regulating valve electrically connected with a controller, the exhaust temperature of the host machine is monitored in real time through a first temperature sensor arranged on the oil-gas mixture pipeline and fed back to the controller, the controller compares the real-time monitored exhaust temperature of the host machine with a target temperature and outputs a control signal to the electric regulating valve so as to adjust the opening angle of the electric regulating valve, for example, when the first temperature sensor monitors that the exhaust temperature of the host machine is higher than the target temperature, the controller controls to increase the opening angle of the electric regulating valve, increase the oil injection quantity so as to reduce the exhaust temperature of the host machine and avoid high-temperature alarm or shutdown of the host machine; when the first temperature sensor monitors that the exhaust temperature of the host is lower than the target temperature, the controller controls to reduce the opening angle of the electric regulating valve, reduce the oil injection quantity, improve the exhaust temperature of the host, effectively avoid condensate water to be separated out to emulsify lubricating oil, deteriorate the quality of the lubricating oil, and can not play a role in lubrication and cooling, so that the oil injection quantity is at the optimal point of the current working condition, the exhaust temperature of the host is actively controlled by accurately controlling the oil injection quantity, the power consumption is optimized, the compressor is ensured to continuously and stably run, the efficiency and the energy conservation are maintained, and various variable use working conditions of the compressor are met.

Drawings

Fig. 1 is an intelligent energy-saving control system of a compressor provided by the utility model.

Fig. 2 is a schematic diagram of another intelligent energy-saving control system for a compressor according to the present utility model.

In the figure:

1. the pressure difference sensor comprises an air inlet unit 2, a differential pressure transmitter 3, an air inlet valve 4, a motor 5, a host 51, a first blow-down valve 71, a first temperature sensor 72, a second temperature sensor 8, a pressure sensor 9, an oil filter 10, an oil heat exchanger 101, a fourth blow-down valve 11, a temperature control valve 111, a first outlet 112, a second outlet 12, an oil cylinder 121, a second blow-down valve 122, an exhaust pipe 13, a safety valve 14, an air heat exchanger 141, a third blow-down valve 15, a minimum pressure valve 16, an air-liquid separator 17, an electromagnetic valve 18, a check valve 19, an air discharge valve 20, a capacity adjustment valve 21, an air-oil separator core 22, an electric adjustment valve 23, a first air source air path 24, a second air path 25, a third air source air path 26, a fourth air source air path 27, an oil return pipe 28, a cooling water pipe 29, an oil pumping pipe 30, a humidity sensor 31, an air-gas mixture pipe 32 and a controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.

Example 1:

as shown in fig. 1, the intelligent energy-saving control system of the compressor provided by the utility model comprises an air inlet unit 1, a motor 4, a host machine 5, an oil cylinder 12, a heat exchange unit, a parameter acquisition unit, a pipeline unit, an oil return amount control unit and a controller 32. The air inlet unit 1 and the motor 4 are respectively connected with a host machine 5. The parameter acquisition unit and the oil return amount control unit are electrically connected with the controller 32, respectively. The parameter acquisition unit comprises a first temperature sensor 71 arranged on the gas-oil mixture line 31 for monitoring the exhaust temperature of the main unit 5. The pipeline unit comprises an oil circuit pipeline, the oil circuit pipeline comprises an oil-gas mixture pipeline 31 and an oil return pipeline 27, the host machine 5 is connected with the oil return pipeline 27 through the oil-gas mixture pipeline 31, the oil-gas cylinder 12 and the oil return pipeline 27 in sequence, and the oil return pipeline 27 is connected with the host machine 5 to form a closed-loop oil circuit. The heat exchange unit comprises an oil heat exchanger 10 for cooling the return oil temperature of the return oil line 27. The return oil amount control unit includes an electric control valve 22 provided on a return oil line 27. Preferably, the electrically operated regulator valve 22 is an electrically operated intelligent ball valve, model Q911F-16-DN25 normally open valve.

The controller 32 determines the current compressed air dew point temperature of the exhaust gas of the main machine 5 through the parameter acquisition unit. Preferably, the controller 32 employs a PLC controller 32. The parameter acquisition unit comprises a first temperature sensor 71 for monitoring the exhaust temperature of the main unit 5, a second temperature sensor 72 for monitoring the intake temperature of the main unit 5, a pressure sensor 8 for monitoring the exhaust pressure of the main unit 5 and a humidity sensor 30 for monitoring the ambient humidity of the main unit 5, the first temperature sensor 71 being arranged on the air-fuel mixture line 31, the second temperature sensor 72 being arranged on the air intake unit 1, the pressure sensor 8 being arranged on the return line 27, the humidity sensor 30 being arranged on the intake end of the main unit 5, preferably the humidity sensor 30 being arranged on the intake end of the air intake unit 1. The first temperature sensor 71, the second temperature sensor 72, the pressure sensor 8, and the humidity sensor 30 are all electrically connected to the controller 32. The controller 32 monitors the current intake air temperature, exhaust gas pressure and ambient humidity of the main unit 5 through the second temperature sensor 72, the pressure sensor 8 and the humidity sensor 30 to determine the compressed air dew point temperature of the current working condition of the main unit 5. The process of determining the dew point temperature of the compressed air by the controller 32 through the related parameters of the intake air temperature, the exhaust air pressure and the ambient humidity is related to the prior art, and will not be described herein.

According to the current compressed air dew point temperature of the exhaust gas of the main engine 5 determined by the controller 32, a target temperature of the main engine 5 is preset at the controller 32, and the target temperature is higher than the compressed air dew point temperature. Preferably, the target temperature is above the compressed air dew point temperature and below 105 ℃. Preferably, the target temperature is 85 ℃, and the temperature is higher than the pressure dew point, so that the lubricating oil is not easy to coke and accumulate carbon, the service life is shortened, and the lubricating oil is a temperature point which saves work and ensures stable operation. The first temperature sensor 71 monitors the exhaust temperature of the host 5 in real time and feeds back the exhaust temperature to the controller 32, the controller 32 compares the host exhaust temperature with the target exhaust temperature, and performs a series of logic operations, and outputs a 4-20 mA signal to the electric control valve according to the operation result, so as to control the opening angle of the electric control valve 22. The oil return quantity conveyed by the oil return pipeline 27 back to the host machine 5 is adjusted, so that the oil injection quantity is at the optimal point of the current working condition, the continuous and stable operation of the compressor is ensured, the efficiency and the energy conservation are maintained, and various variable use working conditions of the compressor are met. For example, when the first temperature sensor 71 monitors that the exhaust temperature of the host machine 5 is higher than the target temperature, preferably, when the first temperature sensor 71 monitors that the exhaust temperature of the host machine 5 is higher than 85 ℃, the controller 32 controls to increase the opening angle of the electric regulating valve 22, increase the oil return amount conveyed by the oil return pipeline 27 back to the host machine 5, reduce the exhaust temperature of the host machine 5, avoid the high temperature alarm or shutdown of the host machine 5, ensure that the exhaust temperature of the host machine always surrounds the target temperature and operates at an optimal exhaust temperature point; when the first temperature sensor 71 monitors that the exhaust temperature of the host 5 is lower than the target temperature, preferably, when the first temperature sensor 71 monitors that the exhaust temperature of the host 5 is lower than 85 ℃, the controller 32 controls to reduce the opening angle of the electric regulating valve 22, reduce the oil return amount conveyed back to the host 5 by the oil return pipeline 27, improve the exhaust temperature of the host 5, enable the exhaust temperature of the host 5 to always surround the target temperature, and realize high efficiency and energy saving through accurate control of the oil quantity. The oil injection quantity is controlled to be an optimal value, the exhaust temperature of the main engine is actively controlled by accurately controlling the oil return quantity, the power consumption is optimized, the running cost of the compressor is always kept to be the lowest in the whole life cycle and facing various complicated use conditions, and the benefit maximization is realized.

The process of driving the electric control valve 22 to change the opening angle by the controller 32 belongs to the prior art, for example, a 4-20 mA control signal is transmitted to the electric control valve 22 by the controller 32, and the valve of the electric control valve 22 is driven to change the cross-sectional area between the valve core and the valve seat to control the oil return amount in the oil return pipeline 27, so as to realize an automatic adjustment function.

As an alternative embodiment, the device further comprises a temperature control valve 11 and an oil filter 9 which are arranged on the oil return pipeline 27, wherein the temperature control valve 11 is provided with a first outlet 111 and a second outlet 112, and the first outlet 111 of the temperature control valve 11 is connected with the host machine 5 through the oil filter 9 and the electric regulating valve 22 in sequence; the second outlet 112 of the temperature control valve 11 is connected with the main machine 5 through the oil heat exchanger 10, the oil filter 9 and the electric regulating valve 22 in sequence; when the oil temperature at the oil inlet of the thermo valve 11 is higher than the preset temperature of the thermo valve 11, the thermo valve 11 opens the second outlet 112; when the oil temperature at the oil inlet of the thermo valve 11 is lower than or equal to the preset temperature of the thermo valve 11, the thermo valve 11 opens the first outlet 111.

The host 5 conveys the oil-gas mixture to the oil-gas cylinder 12 through the oil-gas mixture pipeline 31, the oil-gas mixture is subjected to rotational inertia collision separation in the oil-gas cylinder 12, most of large oil drops are gathered to the bottom of the oil-gas cylinder 12 under the action of gravity, lubricating oil gathered to the bottom of the oil-gas cylinder 12 flows back to the host 5 through the oil return pipeline 27, the lubricating oil firstly flows through the temperature control valve 11, when the oil temperature at the oil inlet of the temperature control valve 11 is higher than the preset temperature of the temperature control valve 11, the temperature control valve 11 opens the second outlet 112, and the lubricating oil flows back to the oil return pipeline 27 after entering the heat exchanger for cooling down and then flows back to the host 5 through the oil filter 9 and the electric regulating valve 22 in sequence; when the oil temperature at the oil inlet of the thermo valve 11 is lower than or equal to the preset temperature of the thermo valve 11, the thermo valve 11 opens the first outlet 111, and the lubricating oil flows out from the first outlet 111 and then flows back to the host 5 through the oil filter 9 and the electric control valve 22 in sequence. The temperature control valve 11 automatically switches the flow paths of the lubricating oil according to different oil temperatures in the oil return pipeline 27, so that the oil temperature of the lubricating oil flowing back to the host 5 is kept in a proper temperature range, the host 5 can work and operate normally, energy conservation and emission reduction are ensured, and meanwhile, the energy efficiency is improved. Meanwhile, the oil filter 9 is arranged between the temperature control valve 11 and the electric regulating valve 22 and is used for intercepting solid impurities such as doped dust and dust in lubricating oil in the oil return pipeline 27, so that the host machine 5 can work and operate normally, and the service life of equipment is prolonged.

Example 2:

as shown in fig. 2, the pipeline unit in the embodiment of the present utility model further includes an air source air path, where the air source air path includes a first air source air path 23, a second air source air path 24 and a third air source air path 25. The oil cylinder 12 is connected with the host 5 through a first air source air path 23, and the first air source air path 23 is provided with a check valve 18 for supplementing air, so that the compressor is used for unloading and supplementing air, and excessive vacuumizing is avoided. The oil gas cylinder 12 is connected with the host 5 through a second gas source gas path 24, a blow-down valve 19 for discharging internal pressure is arranged on the second gas source gas path 24, when the compressor is in a stopping moment, the controller 32 controls the blow-down valve 19 to blow down and discharge the exhaust pipe 122 of the oil gas cylinder 12, so that the safety is improved. The air inlet unit 1 is connected with the host 5 through a third air source air path 25, and a differential pressure transmitter 2 and an air inlet valve 3 are sequentially arranged on the third air source air path 25 from the air inlet direction to the air outlet direction. The air intake unit 1 includes an air intake filter, and the humidity sensor 30 is disposed on an air intake end of the air intake filter, and after dust is removed from the air intake filter, air enters the main engine 5 via the air intake valve 3 to be compressed and mixed with lubricating oil, so as to form an air-fuel mixture. As the intake filter is used for a long time, the filter element of the intake filter intercepts a plurality of solid impurities to cause blockage, a pressure difference is formed at the inlet and outlet positions, and once the pressure difference exceeds a preset signaling value of the differential signaling device 2, the differential signaling device 2 sends a blocking signal to the controller 32 to clean or replace the filter element of the intake filter in time.

As an alternative embodiment, the pipeline unit further comprises a fourth air source air path 26, and the fourth air source air path 26 is led out from the exhaust pipe 122 of the oil-gas cylinder 12 and used for controlling the capacity adjustment function of the air inlet valve 3. The fourth air source air path 26 is sequentially provided with the air-liquid separator 16 for removing water, the electromagnetic valve 17 for controlling the on-off of the fourth air source air path 26 and the capacity regulating valve 20 from the air inlet direction to the air outlet direction. The air source discharged by the exhaust pipe 122 of the oil cylinder 12 is connected with the air inlet of the air inlet valve 3 through the air-liquid separator 16, the electromagnetic valve 17 and the capacity regulating valve 20 in sequence, and the opening angle of the air inlet valve 3 is controlled to realize the regulation of the air inflow of the host 5.

As an alternative embodiment, the upper part of the oil cylinder 12 is provided with an oil-gas separator 21 for separating oil mist, the oil-gas separator 21 is connected with the main unit 5 through an oil pumping pipe 29 extending to the bottom thereof, and the top of the oil cylinder 12 is provided with an exhaust pipe 122. After the oil-gas mixture discharged by the host machine 5 enters the oil-gas cylinder 12 through the oil-gas mixture pipeline 31, the oil-gas mixture is separated through the rotation inertia collision in the oil-gas cylinder 12, but partial oil mist is discharged along with the gas due to the limitation of separation precision, so that the oil-gas separator core 21 is arranged at the upper part of the oil-gas cylinder 12, the oil mist is secondarily separated through the oil-gas separator core 21, the secondarily separated oil drops are gathered to the bottom of the oil-gas separator core 21 under the action of gravity, one end of the oil pumping pipeline 29 extends to the bottom of the oil-gas separator core 21, and the other end of the oil pumping pipeline is connected with the host machine 5, so that the secondarily separated lubricating oil finally flows back to the host machine 5, the loss of the lubricating oil is reduced, and the cost is saved.

As an alternative embodiment, the oil gas cylinder 12 is also provided with a safety valve 13 for ensuring the safety of the use of the oil gas cylinder 12.

As an alternative embodiment, the heat exchange unit further comprises a gas heat exchanger for cooling the exhaust gas temperature of the oil cylinder 12, said gas heat exchanger 14 being connected to the oil heat exchanger 10 by means of a cooling water line 28.

As an alternative embodiment, the bottoms of the main unit 5, the oil-gas cylinder 12, the gas heat exchanger 14 and the oil heat exchanger 10 are respectively provided with a first blow-down valve 51, a second blow-down valve 121, a third blow-down valve 141 and a fourth blow-down valve 101, so as to conveniently clean the impurity sediment inside the main unit 5, the oil-gas cylinder 12, the gas heat exchanger 14 and the oil heat exchanger 10 and to conveniently carry out blow-down.

For alternative embodiments, the discharge pipe 122 of the oil cylinder 12 is provided with a minimum pressure valve 15, and the minimum pressure valve 15 functions to establish the system internal pressure and prevent the reverse flow of air when the compressor is unloaded.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (9)

1. The intelligent energy-saving control system of the compressor is characterized by comprising an air inlet unit, a motor, a host, an oil cylinder, a heat exchange unit, a parameter acquisition unit, a pipeline unit, an oil return amount control unit and a controller; the air inlet unit and the motor are respectively connected with the host; the parameter acquisition unit comprises a first temperature sensor which is arranged on the oil-gas mixing pipeline and is used for monitoring the exhaust temperature of the host; the parameter acquisition unit and the oil return amount control unit are respectively and electrically connected with the controller; the pipeline unit comprises an oil circuit pipeline, the oil circuit pipeline comprises an oil-gas mixture pipeline and an oil return pipeline, the host is connected with the oil return pipeline sequentially through the oil-gas mixture pipeline, the oil-gas cylinder and the oil return pipeline, and the oil return pipeline is connected with the host to form a closed-loop oil circuit; the oil return quantity control unit comprises an electric regulating valve arranged on an oil return pipeline; the heat exchange unit comprises an oil heat exchanger for cooling the oil return temperature of the oil return pipeline; the controller determines the current exhaust compressed air dew point temperature of the host through the parameter acquisition unit, the controller presets the target temperature of the host, the target temperature is higher than the compressed air dew point temperature, the first temperature sensor monitors the real-time exhaust temperature of the host and feeds back to the controller, the controller compares the target temperature with the real-time exhaust temperature, the controller outputs a control signal to the electric regulating valve, and the oil injection quantity is reduced or increased by regulating the opening angle of the electric regulating valve so as to regulate the oil return quantity conveyed back to the host by the oil return pipeline.

2. The intelligent energy-saving control system of a compressor according to claim 1, wherein a target temperature of a host is preset in the controller, the target temperature is higher than a dew point temperature of compressed air and lower than 105 ℃, the first temperature sensor monitors a real-time exhaust temperature of the host and feeds back the real-time exhaust temperature to the controller, and the controller outputs a 4-20 mA control signal to the electric regulating valve so as to regulate an opening angle of the electric regulating valve and regulate an oil return quantity fed back to the host by the oil return pipeline; when the first temperature sensor monitors that the exhaust temperature of the host is higher than the target temperature, the controller controls to increase the opening angle of the electric regulating valve and increase the return oil quantity conveyed by the return oil pipeline back to the host; when the exhaust temperature of the host is lower than or equal to the target temperature, the controller controls the opening angle of the electric regulating valve to be reduced, and the oil return quantity conveyed by the oil return pipeline to the host is reduced.

3. The intelligent energy-saving control system of a compressor according to claim 2, wherein the electric regulating valve is an electric intelligent regulating ball valve, and the model is a Q911F-16-DN25 normally open valve.

4. The intelligent energy-saving control system of a compressor according to claim 1, wherein the parameter acquisition unit further comprises a second temperature sensor for monitoring an intake air temperature of the main engine, a pressure sensor for monitoring an exhaust pressure of the main engine, and a humidity sensor for monitoring an ambient humidity of the main engine; the second temperature sensor is arranged on the air inlet unit, the pressure sensor is arranged on the oil return pipeline, the humidity sensor is arranged at the air inlet end of the host, and the second temperature sensor, the pressure sensor and the humidity sensor are all electrically connected with the controller; the controller monitors the air inlet temperature, the air outlet pressure and the ambient humidity of the current host computer through a second temperature sensor, a pressure sensor and a humidity sensor to determine the dew point temperature of the compressed air under the current working condition of the host computer.

5. The intelligent energy-saving control system of a compressor according to claim 1, further comprising a temperature control valve and an oil filter arranged on the oil return pipeline, wherein the temperature control valve is provided with a first outlet and a second outlet, and the first outlet of the temperature control valve is connected with a host through the oil filter and an electric regulating valve in sequence; the second outlet of the temperature control valve is connected with the host through an oil heat exchanger, an oil filter and an electric regulating valve in sequence; when the oil temperature at the oil inlet of the temperature control valve is higher than the preset temperature of the temperature control valve, the temperature control valve opens the second outlet.

6. The intelligent energy-saving control system of a compressor of claim 1, wherein the piping unit further comprises an air supply air circuit, the air supply air circuit comprising a first air supply air circuit, a second air supply air circuit, and a third air supply air circuit; the oil-gas cylinder is connected with the host through a first gas source gas path, and a check valve for supplementing gas is arranged on the first gas source gas path; the oil-gas cylinder is connected with the host through a second air source air path, and an air release valve for releasing the internal pressure is arranged on the second air source air path; the air inlet unit is connected with the host through a third air source air path, and a differential pressure transmitter and an air inlet valve are sequentially arranged on the third air source air path from the air inlet direction to the air outlet direction; the check valve, the blow-off valve, the differential pressure transmitter and the air inlet valve are all electrically connected with the controller.

7. The intelligent energy-saving control system of a compressor according to claim 6, wherein the air supply air circuit further comprises a fourth air supply air circuit for controlling the opening angle of the air inlet valve, and the fourth air supply air circuit is provided with an air-liquid separator, an electromagnetic valve and a capacity regulating valve; the air source discharged by the exhaust pipe of the oil-gas cylinder is connected with the air inlet of the air inlet valve sequentially from the air inlet direction to the air outlet direction through the air-liquid separator, the electromagnetic valve and the capacity regulating valve; the electromagnetic valve and the capacity regulating valve are electrically connected with the controller.

8. The intelligent energy-saving control system of a compressor according to claim 1, wherein an oil-gas separator core for separating oil mist is arranged at the upper part of the oil cylinder, and lubricating oil deposited at the bottom of the oil-gas separator core is connected with a host through an oil pumping pipeline.

9. The intelligent energy saving control system of a compressor according to claim 1, wherein the heat exchanging unit further comprises a gas heat exchanger for cooling an exhaust temperature of the gas passing through the oil cylinder, the gas heat exchanger being connected to the oil heat exchanger through a cooling water pipe.

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