CN112665222A - Refrigeration system and oil supply control method, device and controller thereof - Google Patents
Refrigeration system and oil supply control method, device and controller thereof Download PDFInfo
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- CN112665222A CN112665222A CN202011492926.9A CN202011492926A CN112665222A CN 112665222 A CN112665222 A CN 112665222A CN 202011492926 A CN202011492926 A CN 202011492926A CN 112665222 A CN112665222 A CN 112665222A
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- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000005057 refrigeration Methods 0.000 title claims abstract description 65
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 20
- 230000001276 controlling effect Effects 0.000 claims description 60
- 230000001105 regulatory effect Effects 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 23
- 239000003507 refrigerant Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 448
- 238000010586 diagram Methods 0.000 description 8
- 239000010726 refrigerant oil Substances 0.000 description 7
- 230000000875 corresponding effect Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The application relates to a refrigeration system, an oil supply control method and device thereof, and a controller. Wherein, on the basis of including the oil supply pipeline of fuel feeding solenoid valve among original refrigerating system, through setting up the oil pump parallelly connected with fuel feeding solenoid valve and the entry of oil pump with the oil feeding pipeline of the outlet side of oil separator is connected to and set up the electrical control valve of establishing ties between the fuel feeding mouth of fuel feeding solenoid valve and compressor to can improve initial fuel feeding temperature and increase the pressure of supplying oil based on the oil pump operation, and can control the oil flow of fuel feeding pipeline based on electrical control valve. That is to say, with such an arrangement, when oil is supplied to the oil injection screw compressor, the requirement for the pressure difference of suction and exhaust of the compressor can be reduced, that is, the operation range of the compressor under the low pressure difference of suction and exhaust is widened, and the actual oil injection amount can be controlled.
Description
Technical Field
The application relates to the technical field of refrigeration systems, in particular to a refrigeration system and an oil supply control method, device and controller thereof.
Background
For a refrigerating system comprising an oil injection screw compressor, oil injection (oil supply) needs to be carried out on air suction, air exhaust, a machine body spray hole, an loading and unloading oil way and the like of the compressor in the using process so as to meet the requirements of lubricating a balance piston and a bearing, lubricating, noise reduction and cooling in a rotor cavity and pushing an loading and unloading slide valve.
In the prior art, oil injection can be realized only when the pressure difference between the air suction and the air exhaust of the compressor meets the condition. In addition, the oil injection amount (oil supply amount) of exhaust cooling is only required to be met, the oil injection amount is comprehensively considered with the basic oil injection amounts of the air suction, the engine body and the exhaust, the oil injection orifice is designed to be unadjustable or limitedly adjusted, differential pressure oil injection is carried out through the air suction and exhaust pressure difference randomly established in the operation, and the actual oil injection amount cannot be controlled.
That is, in the related art, when oil is supplied to the oil injection screw compressor, there is a certain requirement for the pressure difference between the suction and exhaust of the compressor, and the actual amount of injected oil cannot be controlled.
Disclosure of Invention
The application provides a refrigeration system, an oil supply control method and device thereof, and a controller, which are used for solving the problems that in the related art, when oil is supplied to an oil injection screw compressor, certain requirements are required on the pressure difference of suction and exhaust of the compressor, and the actual oil injection quantity cannot be controlled.
The above object of the present application is achieved by the following technical solutions:
in a first aspect, an embodiment of the present application provides a refrigeration system, which includes: a compressor and an oil separator for storing oil; wherein the compressor is an oil injection screw compressor;
the outlet of the oil separator is connected with the oil supply port of the compressor through an oil supply pipeline, and an oil supply electromagnetic valve is arranged on the oil supply pipeline;
the oil supply pipeline is also provided with: the oil pump is connected with the oil supply electromagnetic valve in parallel, and the electric regulating valve is connected between the oil supply electromagnetic valve and an oil supply port of the compressor in series; the inlet of the oil pump is connected with an oil supply pipeline on the outlet side of the oil separator;
the oil pump is used for increasing the initial oil supply temperature and increasing the oil supply pressure; and the electric regulating valve is used for controlling the oil flow of the oil supply pipeline.
Optionally, the system further includes an oil supply temperature sensor disposed on an oil supply line between the electric control valve and the oil supply solenoid valve;
the oil supply temperature sensor is used for detecting the oil supply temperature in the oil supply pipeline;
before the compressor starts, when the fuel feeding temperature is less than preset fuel feeding temperature, the electric regulating valve is closed, the oil pump with the fuel feeding solenoid valve is opened, and the fuel feeding temperature is improved through the operation of the oil pump.
Optionally, the system further includes an oil supply pressure sensor disposed on an oil supply line between the electric control valve and an oil supply port of the compressor, and a suction pressure sensor disposed on a suction side of the compressor;
the oil supply pressure sensor is used for detecting the oil supply pressure in the oil supply pipeline; the suction pressure sensor is used for detecting the suction pressure of the compressor;
before the compressor starts, when the pressure difference between the oil supply pressure and the suction pressure is smaller than a first preset pressure difference, the oil supply electromagnetic valve is closed, the oil pump and the electric regulating valve are opened, and the oil supply pressure is increased through the operation of the oil pump.
In a second aspect, an embodiment of the present application further provides an oil supply control method for a refrigeration system, which is applied to the refrigeration system according to the last item of the first aspect, and the method includes:
before the compressor is started, acquiring the oil supply temperature, and judging whether a preset oil supply temperature condition is met; the preset oil supply temperature condition comprises that the oil supply temperature is greater than or equal to the preset oil supply temperature;
when the preset oil supply temperature condition is not met, controlling the electric regulating valve to be closed, and controlling the oil pump and the oil supply electromagnetic valve to be opened so as to improve the oil supply temperature through the operation of the oil pump;
when the preset oil supply temperature condition is met, acquiring the pressure difference between the oil supply pressure and the suction pressure, and judging whether the pressure difference is greater than or equal to a first preset pressure difference;
when the pressure difference is smaller than the first preset pressure difference, controlling the oil supply electromagnetic valve to be closed, and controlling the oil pump and the electric regulating valve to be opened so as to increase the oil supply pressure through the operation of the oil pump;
and when the pressure difference is greater than or equal to the first preset pressure difference, controlling the compressor to start.
Optionally, the preset oil supply temperature condition further includes: the time for which the oil pump continuously operates to increase the oil supply temperature reaches a preset time;
accordingly, when the oil supply temperature is greater than or equal to the preset oil supply temperature, or when the time during which the oil pump continues to operate to increase the oil supply temperature reaches a preset time, it is determined that the preset oil supply temperature condition is satisfied.
Optionally, the controlling the compressor to start further includes:
when the compressor is loaded to a preset lowest load, the oil supply electromagnetic valve is controlled to be opened, and the oil pump is controlled to be closed;
and in the running process of the compressor, the opening of the electric regulating valve is regulated according to the oil supply quantity required by the compressor.
Optionally, the adjusting the opening of the electric control valve according to the oil supply amount required by the compressor includes:
acquiring the operation parameters of the refrigeration system in the operation process of the compressor;
and determining the oil supply quantity required by the compressor according to the operation parameters of the refrigeration system.
Optionally, the operation parameters of the refrigeration system include a suction pressure, a discharge pressure, a suction temperature, a discharge temperature, and an operation current of the compressor, and an oil supply temperature and an oil supply pressure of the oil supply line.
Optionally, the determining an oil supply amount required by the compressor according to the operation parameter of the refrigeration system includes:
determining the high-low pressure difference of the current working condition according to the suction pressure and the discharge pressure, determining the physical state of suction and discharge according to the suction temperature and the discharge temperature, determining the load of the compressor according to the operating current, and determining the physical state of oil supply according to the oil supply temperature and the oil supply pressure;
and determining the oil supply quantity required by the compressor according to the high-low pressure difference of the current working condition, the physical state of the air suction and exhaust, the load of the compressor and the physical state of the oil supply.
Optionally, the method further includes:
judging whether the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to a second preset pressure difference or not in real time in the running process of the compressor;
when the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to the second preset pressure difference, controlling the oil pump to be in an open state, and controlling the oil supply electromagnetic valve to be in a closed state; and when the pressure difference between the oil supply pressure and the suction pressure is greater than the second preset pressure difference, controlling the oil pump to be in a closed state, and controlling the oil supply electromagnetic valve to be in an open state.
In a third aspect, an embodiment of the present application further provides an oil supply control device for a refrigeration system, which is applied to the refrigeration system according to the third aspect of the first aspect, where the device includes:
the first judgment module is used for acquiring the oil supply temperature before the compressor is started and judging whether a preset oil supply temperature condition is met or not; the preset oil supply temperature condition comprises that the oil supply temperature is greater than or equal to the preset oil supply temperature;
the first control module is used for controlling the electric regulating valve to be closed and controlling the oil pump and the oil supply electromagnetic valve to be opened when the preset oil supply temperature condition is not met so as to improve the oil supply temperature through the operation of the oil pump;
the second judgment module is used for acquiring the pressure difference between the oil supply pressure and the suction pressure when the preset oil supply temperature condition is met, and judging whether the pressure difference is greater than or equal to the first preset pressure difference;
the second control module is used for controlling the oil supply electromagnetic valve to be closed and controlling the oil pump and the electric regulating valve to be opened when the pressure difference is smaller than the first preset pressure difference so as to increase the oil supply pressure through the operation of the oil pump;
and the third control module is used for controlling the compressor to start when the pressure difference is greater than or equal to the first preset pressure difference.
Optionally, the preset oil supply temperature condition further includes: the time for which the oil pump continuously operates to increase the oil supply temperature reaches a preset time;
accordingly, when the oil supply temperature is greater than or equal to the preset oil supply temperature, or when the time during which the oil pump continues to operate to increase the oil supply temperature reaches a preset time, it is determined that the preset oil supply temperature condition is satisfied.
Optionally, the apparatus further comprises:
the fourth control module is used for controlling the oil supply electromagnetic valve to be opened and controlling the oil pump to be closed when the compressor is loaded to a preset lowest load;
and the adjusting module is used for correspondingly adjusting the opening of the electric adjusting valve according to the oil supply quantity required by the compressor.
Optionally, the apparatus further comprises:
the acquisition module is used for acquiring the operation parameters of the refrigeration system in the operation process of the compressor;
and the determining module is used for determining the oil supply quantity required by the compressor according to the operation parameters of the refrigerating system.
Optionally, the operation parameters of the refrigeration system include a suction pressure, a discharge pressure, a suction temperature, a discharge temperature, and an operation current of the compressor, and an oil supply temperature and an oil supply pressure of the oil supply line.
Optionally, the determining module is specifically configured to:
determining the high-low pressure difference of the current working condition according to the suction pressure and the discharge pressure, determining the physical state of suction and discharge according to the suction temperature and the discharge temperature, determining the load of the compressor according to the operating current, and determining the physical state of oil supply according to the oil supply temperature and the oil supply pressure;
and determining the oil supply quantity required by the compressor according to the high-low pressure difference of the current working condition, the physical state of the air suction and exhaust, the load of the compressor and the physical state of the oil supply.
Optionally, the apparatus further comprises:
the third judgment module is used for judging whether the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to a second preset pressure difference in real time in the running process of the compressor;
the fifth control module is used for controlling the oil pump to be in an open state and the oil supply electromagnetic valve to be in a closed state when the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to the second preset pressure difference; and when the pressure difference between the oil supply pressure and the suction pressure is greater than the second preset pressure difference, controlling the oil pump to be in a closed state, and controlling the oil supply electromagnetic valve to be in an open state.
In a fourth aspect, an embodiment of the present application further provides an oil supply controller of a refrigeration system, including:
a memory and a processor coupled to the memory;
the memory for storing a program for implementing at least the oil supply control method of the refrigeration system according to any one of the second aspect;
the processor is used for calling and executing the program stored in the memory.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the technical scheme that the embodiment of this application provided, on the basis of the oil supply pipeline including the oil supply solenoid valve among original refrigerating system, through setting up the oil pump parallelly connected with the oil supply solenoid valve and the entry of oil pump with the oil supply pipeline of the outlet side of oil separator is connected to and set up the electrical control valve of establishing ties between the fuel feeding mouth of oil supply solenoid valve and compressor, thereby can improve initial fuel feeding temperature and increase the oil supply pressure based on the oil pump operation, and can control the oil flow of oil supply pipeline based on electrical control valve. That is to say, the arrangement can reduce the requirement on the suction and exhaust pressure difference of the compressor when the oil is supplied to the oil injection screw compressor, and can control the actual oil injection quantity.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a prior art refrigeration system;
fig. 2 is a schematic structural diagram of a refrigeration system according to an embodiment of the present application;
fig. 3 is a flowchart illustrating an oil supply control method of a refrigeration system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an oil supply control device of a refrigeration system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an oil supply controller of a refrigeration system according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
In order to make the technical solution of the present application easier to understand, an existing refrigeration system and an oil supply process thereof will be briefly described.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a conventional refrigeration system. The system mainly comprises a compressor 1, an oil separator 2, a condenser 3, an evaporator 4 and corresponding pipelines, wherein an oil supply electromagnetic valve 5 and other auxiliary valves, filters, a liquid sight glass and other components are arranged on an oil supply pipeline between an outlet (oil outlet) of the oil separator and an oil supply port of the compressor.
On the basis, in the starting and running processes of the compressor, the suction side (the left side of the compressor in fig. 1 is the suction side) and the exhaust side (the right side of the compressor in fig. 1 is the exhaust side) have suction and exhaust pressure difference, when the suction and exhaust pressure difference is larger, larger pressure is generated inside the oil separator, the oil supply pressure in the oil supply pipeline meets the oil supply requirement, the compressor can be normally supplied with oil, and the larger the suction and exhaust pressure difference is, the larger the oil supply amount is, the smaller the suction and exhaust pressure difference is, and the smaller the oil supply amount is; when the pressure difference between the air suction and the air exhaust is small, the oil supply pressure in the oil supply pipeline does not meet the oil supply requirement, and the oil cannot be normally supplied to the compressor at the moment. Also, this process cannot control the amount of oil supply.
That is to say, under the condition that the pressure difference between the suction and the exhaust of the compressor is small or the pressure difference between the suction and the exhaust is slow, the oil injection quantity is insufficient, so that the bearing lubrication is poor, the exhaust temperature is high, the loading and unloading oil way cannot be adjusted, the rotor lubrication sealing is insufficient, and the like, and the compressor cannot normally operate under the working condition. Under the working condition of large pressure difference of air suction and exhaust, the oil injection amount is overlarge at the moment, so that the problems of low exhaust temperature cooling, excessive oil injection amount, performance loss caused by disturbance, overlarge exhaust oil amount, influence on the energy efficiency of the heat exchanger and the like are caused.
In order to solve the above problems, the present application improves the above refrigeration system, and the following description is made by way of example.
Examples
Referring to fig. 2, fig. 2 is a schematic structural diagram of a refrigeration system according to an embodiment of the present application. As shown in fig. 2, in the refrigeration system, in addition to the system shown in fig. 1, the oil supply line is further provided with: an oil pump 6 connected in parallel with the oil supply solenoid valve 5, and an electric control valve 7 connected in series between the oil supply solenoid valve 5 and an oil supply port of the compressor 1; the inlet of the oil pump 6 is connected with an oil supply pipeline on the outlet side of the oil separator 2; the oil pump 6 is used for increasing the initial oil supply temperature and increasing the oil supply pressure; the electric control valve 7 is used for controlling the oil flow of the oil supply pipeline.
The oil supply temperature refers to the temperature of the refrigerant oil in the oil supply line before entering the oil supply port of the compressor 1, and the initial oil supply temperature refers to the oil supply temperature before the compressor is started. The oil supply pressure is the pressure of the refrigerant oil in the oil supply line before entering the oil supply port of the compressor 1, and is positively correlated with the suction/discharge differential pressure of the compressor. In order to stably operate the system, when the fuel supply temperature is too low, the fuel supply is not suitable, and when the fuel supply pressure is too low, the fuel supply cannot be performed. Therefore, in the present embodiment, by providing the oil pump 6 and using the operation effect thereof to raise the initial oil supply temperature and increase the oil supply pressure, the oil can be supplied to the compressor when the system does not satisfy the oil supply requirement or is not suitable for the oil supply. The oil supply amount to the compressor 1 is adjusted by adjusting the opening of the electric control valve 7 to adjust the oil flow rate in the oil supply line.
Specifically, in some embodiments, the method for increasing the initial oil supply temperature by the oil pump 6 may be:
as shown in fig. 2, the refrigeration system further includes an oil supply temperature sensor 8 provided on the oil supply line between the electrical regulator valve 7 and the oil supply solenoid valve 5; the oil supply temperature sensor 8 is used for detecting the oil supply temperature in the oil supply pipeline; before the compressor is started, when the oil supply temperature is lower than the preset oil supply temperature (when the oil supply is not suitable), the electric regulating valve 7 is closed, the oil pump 6 and the oil supply electromagnetic valve 5 are opened, and the oil supply temperature is increased through the operation of the oil pump 6. That is, when the electric control valve 7 is closed and the oil pump 6 and the oil supply solenoid valve 5 are opened, the refrigerant oil flowing out from the oil separator outlet first enters the oil pump 6, and then after the refrigerant oil is discharged from the oil pump 6, the refrigerant oil will return to the suction port of the oil pump 6 again from the oil supply solenoid valve 5 because the electric control valve 7 is closed, and at this time, the refrigerant oil will circulate inside separately before and after the oil pump 6, and the refrigerant oil is heated because the pump body is heated while the oil pump 6 is running.
Further, in some embodiments, the method of increasing the oil supply pressure by the oil pump 6 may be:
as shown in fig. 2, the refrigeration system further includes an oil supply pressure sensor 9 provided on an oil supply line between the electric regulator valve and an oil supply port of the compressor, and a suction pressure sensor provided on a suction side of the compressor; the oil supply pressure sensor 9 is used for detecting the oil supply pressure in the oil supply pipeline; the suction pressure sensor is used for detecting the suction pressure of the compressor; before the compressor is started, when the pressure difference between the oil supply pressure and the suction pressure is smaller than a first preset pressure difference, the oil supply electromagnetic valve is closed, the oil pump and the electric regulating valve are opened, and the oil supply pressure is increased through the operation of the oil pump. That is, the oil supply solenoid valve is closed, and when the oil pump and the electric control valve are opened, the oil supply pressure can be increased through the operation of the oil pump.
Based on this, in the above technical scheme, on the basis of the oil supply pipeline including the oil supply solenoid valve in the original refrigeration system, by providing the oil pump connected in parallel with the oil supply solenoid valve and connecting the inlet of the oil pump with the oil supply pipeline on the outlet side of the oil separator, and providing the electric control valve connected in series between the oil supply solenoid valve and the oil supply port of the compressor, the initial oil supply temperature and the oil supply pressure can be increased based on the operation of the oil pump, and the oil flow rate of the oil supply pipeline can be controlled based on the electric control valve. That is to say, with such an arrangement, when oil is supplied to the oil injection screw compressor, the requirement for the pressure difference of suction and exhaust of the compressor can be reduced, that is, the operation range of the compressor under the low pressure difference of suction and exhaust is widened, and the actual oil injection amount can be controlled.
In addition, on the basis of the refrigeration system provided by the embodiment, the application also provides an oil supply control method of the refrigeration system.
Referring to fig. 3, fig. 3 is a flowchart illustrating an oil supply control method of a refrigeration system according to an embodiment of the present disclosure.
As shown in fig. 3, the method comprises at least the following steps:
s301: before the compressor is started, acquiring the oil supply temperature, and judging whether a preset oil supply temperature condition is met; the preset oil supply temperature condition comprises that the oil supply temperature is greater than or equal to the preset oil supply temperature;
that is, before the compressor is started, the current oil supply temperature is collected by the set oil supply temperature sensor, and whether the current oil supply temperature meets the preset oil supply condition or not is judged, including whether the current oil supply temperature is greater than or equal to the preset oil supply temperature or not is judged.
S302: when the preset oil supply temperature condition is not met, controlling the electric regulating valve to be closed, and controlling the oil pump and the oil supply electromagnetic valve to be opened so as to improve the oil supply temperature through the operation of the oil pump;
that is, when the preset oil supply temperature condition is not satisfied, the oil supply temperature is increased by controlling the operation of the oil pump according to the method described in the foregoing embodiment.
In addition, considering that the oil supply is not impossible but is not suitable when the oil supply temperature is lower than the preset oil supply temperature, in order to avoid the heating of the refrigeration oil for a long time (corresponding to the long waiting time of the compressor for the oil supply), the preset oil supply temperature condition may further include: the time that the oil pump continuously operates for improving the oil supply temperature reaches the preset time; accordingly, when the oil supply temperature is greater than or equal to the preset oil supply temperature, or when the time during which the oil pump continues to operate to increase the oil supply temperature reaches the preset time, it is determined that the preset oil supply temperature condition is satisfied. That is, as long as any sub-condition of the preset oil supply temperature condition is satisfied, it can be determined that the preset oil supply temperature condition is satisfied, and the subsequent steps can be continued.
S303: when the preset oil supply temperature condition is met, acquiring the pressure difference between the oil supply pressure and the suction pressure, and judging whether the pressure difference is greater than or equal to a first preset pressure difference;
that is, when the preset oil supply temperature condition is satisfied, whether the current oil supply pressure satisfies the oil supply condition is determined by determining whether a pressure difference between the current oil supply pressure and the current suction pressure of the compressor is greater than or equal to a first preset pressure difference.
It should be noted that the step S303 of "meeting the preset oil supply temperature condition" includes directly determining that the preset oil supply temperature condition is met in the determination of the step S301, and also includes determining that the preset oil supply temperature condition is met after the oil pump is heated in the step S302.
S304: when the pressure difference is smaller than the first preset pressure difference, controlling the oil supply electromagnetic valve to be closed, and controlling the oil pump and the electric regulating valve to be opened so as to increase the oil supply pressure through the operation of the oil pump;
that is, when the pressure difference is smaller than the first preset pressure difference, which indicates that the oil supply cannot be performed normally, the method according to the foregoing embodiment increases the oil supply pressure by controlling the operation of the oil pump, thereby increasing the pressure difference.
S305: and when the pressure difference is greater than or equal to the first preset pressure difference, controlling the compressor to start.
That is, when the pressure difference is greater than or equal to the first preset pressure difference, it indicates that oil supply is possible normally, and thus, the compressor may be started, thereby causing the refrigeration system to enter a normal refrigeration cycle.
On the basis, the compressor is gradually loaded after being started, and when the compressor is loaded to the preset lowest load, the oil supply electromagnetic valve is controlled to be opened, and the oil pump is controlled to be closed; and in the running process of the compressor, the opening of the electric regulating valve is regulated according to the oil supply quantity required by the compressor.
The compressor normally operates with a minimum load requirement, and if the load is smaller than the minimum load, the motor may generate heat excessively and the oil return pressure difference may be insufficient, so the preset minimum load is usually set. The time node when the compressor is loaded to the preset lowest load can be regarded as the time node when the compressor is started, and normal oil supply can be carried out.
In addition, in some embodiments, before the opening of the electric control valve is adjusted according to the oil supply amount required by the compressor during the operation of the compressor, the method further includes: acquiring the operation parameters of a refrigeration system in the operation process of a compressor; and determining the oil supply quantity required by the compressor according to the operation parameters of the refrigeration system.
That is, the oil supply amount required by the compressor may be determined by the operation parameters of the refrigeration system in the present embodiment, for example, in some embodiments, the operation parameters of the refrigeration system for determining the oil supply amount required by the compressor include a suction pressure, a discharge pressure, a suction temperature, a discharge temperature, and an operation current of the compressor, and an oil supply temperature and an oil supply pressure in the oil supply line. As shown in fig. 2, the suction pressure and the suction temperature of the compressor may be respectively acquired by a pressure sensor and a temperature sensor disposed at the suction side, and the discharge pressure and the discharge temperature may be respectively acquired by a pressure sensor and a temperature sensor disposed at the discharge side.
On the basis, the embodiment provides a method for determining the oil supply amount required by the compressor, which comprises the following steps:
determining the high-low pressure difference of the current working condition according to the suction pressure and the discharge pressure, determining the physical state of suction and discharge according to the suction temperature and the discharge temperature, determining the load of the compressor according to the operating current, and determining the physical state of oil supply according to the oil supply temperature and the oil supply pressure; and determining the oil supply quantity required by the compressor according to the high-low pressure difference of the current working condition, the physical state of the air suction and exhaust, the load of the compressor and the physical state of the oil supply.
The physical state is parameters such as density and viscosity.
More specifically, the calculation of the actual oil supply amount required by the compressor is considered on the basis of the following.
The oil supply of a general oil injection screw compressor is divided into 4 parts: air suction, body, air exhaust, loading and unloading. For different designs of screw compressors, different calculation formulas are designed, and a principle formula is given below (formula adjustment can be further performed according to different designs of compressors in practical application):
1. air suction
The oil supply amount q can be calculated with reference to the following formula:
wherein, Delta P, hcpAnd ε and L are data on the influence of the mechanical structure of the compressor, and μ is the dynamic viscosity coefficient (physical state) of the oil supply.
2. Machine body
The oil supply amount q can be calculated with reference to the following formula:
note that C, A and Δ P are compressor mechanical structure influence data, and ρ is the density (physical state) of the oil supply.
3. Exhaust of gases
Similarly to the above, the oil supply is mainly inversely proportional to ρ (density of oil supply) and μ (kinetic viscosity coefficient of oil supply), in addition to the mechanical design parameters of the compressor itself.
4. Loading and unloading
The oil supply quantity under the condition of ensuring the loading and unloading speed, namely the pushing speed of the slide valve, is mainly related to the current air suction and exhaust pressure difference and is inversely proportional to a dynamic viscosity system of the oil supply.
Based on this, the actual oil supply amount is the sum of the above oil supply amounts, and in practical application, if other factors are considered, other coefficients need to be added. In addition, the dynamic viscosity and density of the oil supply are diluted by the refrigerant, and therefore, are related to the current temperature and pressure of the suction/discharge refrigerant (suction/discharge gas). Furthermore, a higher compressor current indicates a higher present load, and a higher oil supply is generally required.
When the oil supply amount actually required by the compressor is determined, the calculated target opening e1 to the electric control valve is corresponded, and the actual opening of the electric control valve is adjusted to be equal to the target opening e 1.
In addition, on the basis of the scheme, the method further comprises the following steps:
judging whether the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to a second preset pressure difference or not in real time in the running process of the compressor; when the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to the second preset pressure difference, controlling the oil pump to be in an open state, and controlling the oil supply electromagnetic valve to be in a closed state; and when the pressure difference between the oil supply pressure and the suction pressure is greater than the second preset pressure difference, controlling the oil pump to be in a closed state, and controlling the oil supply electromagnetic valve to be in an open state.
That is, in addition to increasing the oil supply pressure by the oil pump before the compressor is started, the oil supply pressure may be detected in real time during the operation of the compressor, and when the oil supply pressure is insufficient (less than or equal to a second preset pressure difference set for the operation), the oil supply pressure may also be increased by opening the oil pump and closing the oil supply solenoid valve, and when the compressor continues to operate, if the oil supply pressure is detected in real time to be sufficient, the oil pump is closed and the oil supply solenoid valve is opened to return to the normal oil supply state.
Through the oil supply control method in each embodiment, the oil injection quantity of the compressor can be accurately controlled by using the adjusting equipment such as the oil pump and the electric regulating valve according to parameters such as pressure, temperature and energy level under different working conditions, so that the operation range of the compressor under low suction-exhaust pressure difference can be further widened, and the energy efficiency reduction caused by too large or too small oil injection quantity is reduced.
In addition, corresponding to the oil supply control method of the refrigeration system provided by the embodiment, the embodiment of the application also provides an oil supply control device of the refrigeration system.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an oil supply control device of a refrigeration system according to an embodiment of the present application. As shown in fig. 4, the apparatus includes:
the first judging module 41 is configured to obtain the oil supply temperature before the compressor is started, and judge whether a preset oil supply temperature condition is met; the preset oil supply temperature condition comprises that the oil supply temperature is greater than or equal to the preset oil supply temperature;
the first control module 42 is configured to control the electric regulating valve to be closed and control the oil pump and the oil supply electromagnetic valve to be opened when the preset oil supply temperature condition is not met, so that the oil supply temperature is increased by operation of the oil pump;
the second judging module 43 is configured to, when the preset oil supply temperature condition is met, obtain a pressure difference between the oil supply pressure and the suction pressure, and judge whether the pressure difference is greater than or equal to the first preset pressure difference;
a second control module 44, configured to control the oil supply solenoid valve to close and control the oil pump and the electric regulating valve to open when the pressure difference is smaller than the first preset pressure difference, so as to increase the oil supply pressure through operation of the oil pump;
a third control module 45 for controlling the compressor to start when the pressure difference is greater than or equal to the first preset pressure difference.
Optionally, the preset oil supply temperature condition further includes: the time for which the oil pump continuously operates to increase the oil supply temperature reaches a preset time;
accordingly, when the oil supply temperature is greater than or equal to the preset oil supply temperature, or when the time during which the oil pump continues to operate to increase the oil supply temperature reaches a preset time, it is determined that the preset oil supply temperature condition is satisfied.
Optionally, the apparatus further comprises:
the fourth control module is used for controlling the oil supply electromagnetic valve to be opened and controlling the oil pump to be closed when the compressor is loaded to a preset lowest load;
and the adjusting module is used for correspondingly adjusting the opening of the electric adjusting valve according to the oil supply quantity required by the compressor.
Optionally, the apparatus further comprises:
the acquisition module is used for acquiring the operation parameters of the refrigeration system in the operation process of the compressor;
and the determining module is used for determining the oil supply quantity required by the compressor according to the operation parameters of the refrigerating system.
Optionally, the operation parameters of the refrigeration system include a suction pressure, a discharge pressure, a suction temperature, a discharge temperature, and an operation current of the compressor, and an oil supply temperature and an oil supply pressure of the oil supply line.
Optionally, the determining module is specifically configured to:
determining the high-low pressure difference of the current working condition according to the suction pressure and the discharge pressure, determining the physical state of suction and discharge according to the suction temperature and the discharge temperature, determining the load of the compressor according to the operating current, and determining the physical state of oil supply according to the oil supply temperature and the oil supply pressure;
and determining the oil supply quantity required by the compressor according to the high-low pressure difference of the current working condition, the physical state of the air suction and exhaust, the load of the compressor and the physical state of the oil supply.
Optionally, the apparatus further comprises:
the third judgment module is used for judging whether the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to a second preset pressure difference in real time in the running process of the compressor;
the fifth control module is used for controlling the oil pump to be in an open state and the oil supply electromagnetic valve to be in a closed state when the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to the second preset pressure difference; and when the pressure difference between the oil supply pressure and the suction pressure is greater than the second preset pressure difference, controlling the oil pump to be in a closed state, and controlling the oil supply electromagnetic valve to be in an open state.
The specific implementation method of the steps implemented by the functional modules may refer to corresponding contents in the foregoing method embodiments, and details are not described here.
In addition, corresponding to the oil supply control method of the refrigeration system provided by the embodiment, the embodiment of the application also provides an oil supply controller of the refrigeration system.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an oil supply controller of a refrigeration system according to an embodiment of the present disclosure. As shown in fig. 5, the controller includes:
a memory 51 and a processor 52 connected to the memory 51;
the memory 51 is used for storing a program for implementing at least the oil supply control method of the refrigeration system described in the above method embodiment;
the processor 52 is used to call and execute the program stored in the memory 51.
After the controller is applied to the refrigeration system shown in fig. 2, the control of the refrigeration process of the refrigerator can be realized according to the oil supply control method, and the specific implementation process of the method implemented by the program in the controller can refer to the corresponding content in the foregoing method embodiment, and is not described in detail here.
Through the scheme of each embodiment, the oil injection quantity of the compressor can be accurately controlled by using adjusting equipment such as an oil pump and an electric regulating valve according to parameters such as pressure, temperature and energy level under different working conditions, so that the operation range of the compressor under low suction-exhaust pressure difference can be further widened, and the reduction of energy efficiency caused by too large or too small oil injection quantity is reduced.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (18)
1. A refrigeration system, comprising: a compressor and an oil separator for storing oil; wherein the compressor is an oil injection screw compressor;
the outlet of the oil separator is connected with the oil supply port of the compressor through an oil supply pipeline, and an oil supply electromagnetic valve is arranged on the oil supply pipeline;
the oil supply pipeline is also provided with: the oil pump is connected with the oil supply electromagnetic valve in parallel, and the electric regulating valve is connected between the oil supply electromagnetic valve and an oil supply port of the compressor in series; the inlet of the oil pump is connected with an oil supply pipeline on the outlet side of the oil separator;
the oil pump is used for increasing the initial oil supply temperature and increasing the oil supply pressure; and the electric regulating valve is used for controlling the oil flow of the oil supply pipeline.
2. The system of claim 1, further comprising an oil supply temperature sensor disposed on an oil supply line between the electrical regulator valve and the oil supply solenoid valve;
the oil supply temperature sensor is used for detecting the oil supply temperature in the oil supply pipeline;
before the compressor starts, when the fuel feeding temperature is less than preset fuel feeding temperature, the electric regulating valve is closed, the oil pump with the fuel feeding solenoid valve is opened, and the fuel feeding temperature is improved through the operation of the oil pump.
3. The system of claim 2, further comprising a supply pressure sensor disposed on a supply line between the electrical regulator valve and a supply port of the compressor, and a suction pressure sensor disposed on a suction side of the compressor;
the oil supply pressure sensor is used for detecting the oil supply pressure in the oil supply pipeline; the suction pressure sensor is used for detecting the suction pressure of the compressor;
before the compressor starts, when the pressure difference between the oil supply pressure and the suction pressure is smaller than a first preset pressure difference, the oil supply electromagnetic valve is closed, the oil pump and the electric regulating valve are opened, and the oil supply pressure is increased through the operation of the oil pump.
4. An oil supply control method of a refrigeration system, which is applied to the refrigeration system according to claim 3, the method comprising:
before the compressor is started, acquiring the oil supply temperature, and judging whether a preset oil supply temperature condition is met; the preset oil supply temperature condition comprises that the oil supply temperature is greater than or equal to the preset oil supply temperature;
when the preset oil supply temperature condition is not met, controlling the electric regulating valve to be closed, and controlling the oil pump and the oil supply electromagnetic valve to be opened so as to improve the oil supply temperature through the operation of the oil pump;
when the preset oil supply temperature condition is met, acquiring the pressure difference between the oil supply pressure and the suction pressure, and judging whether the pressure difference is greater than or equal to a first preset pressure difference;
when the pressure difference is smaller than the first preset pressure difference, controlling the oil supply electromagnetic valve to be closed, and controlling the oil pump and the electric regulating valve to be opened so as to increase the oil supply pressure through the operation of the oil pump;
and when the pressure difference is greater than or equal to the first preset pressure difference, controlling the compressor to start.
5. The method of claim 4, wherein the preset oil supply temperature condition further comprises: the time for which the oil pump continuously operates to increase the oil supply temperature reaches a preset time;
accordingly, when the oil supply temperature is greater than or equal to the preset oil supply temperature, or when the time during which the oil pump continues to operate to increase the oil supply temperature reaches a preset time, it is determined that the preset oil supply temperature condition is satisfied.
6. The method of claim 4 or 5, wherein said controlling said compressor to start further comprises thereafter:
when the compressor is loaded to a preset lowest load, the oil supply electromagnetic valve is controlled to be opened, and the oil pump is controlled to be closed;
and in the running process of the compressor, the opening of the electric regulating valve is regulated according to the oil supply quantity required by the compressor.
7. The method of claim 6, wherein said adjusting the opening of said electrically variable valve in accordance with the amount of oil supply required by said compressor, previously comprises:
acquiring the operation parameters of the refrigeration system in the operation process of the compressor;
and determining the oil supply quantity required by the compressor according to the operation parameters of the refrigeration system.
8. The method of claim 7, wherein the operating parameters of the refrigeration system include a suction pressure, a discharge pressure, a suction temperature, a discharge temperature, and an operating current of the compressor, and a supply temperature and a supply pressure of the oil supply line.
9. The method of claim 8, wherein said determining an amount of oil supply required by said compressor based on an operating parameter of said refrigerant system comprises:
determining the high-low pressure difference of the current working condition according to the suction pressure and the discharge pressure, determining the physical state of suction and discharge according to the suction temperature and the discharge temperature, determining the load of the compressor according to the operating current, and determining the physical state of oil supply according to the oil supply temperature and the oil supply pressure;
and determining the oil supply quantity required by the compressor according to the high-low pressure difference of the current working condition, the physical state of the air suction and exhaust, the load of the compressor and the physical state of the oil supply.
10. The method according to any one of claims 6-9, further comprising:
judging whether the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to a second preset pressure difference or not in real time in the running process of the compressor;
when the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to the second preset pressure difference, controlling the oil pump to be in an open state, and controlling the oil supply electromagnetic valve to be in a closed state; and when the pressure difference between the oil supply pressure and the suction pressure is greater than the second preset pressure difference, controlling the oil pump to be in a closed state, and controlling the oil supply electromagnetic valve to be in an open state.
11. An oil supply control apparatus of a refrigeration system, which is applied to the refrigeration system according to claim 3, the apparatus comprising:
the first judgment module is used for acquiring the oil supply temperature before the compressor is started and judging whether a preset oil supply temperature condition is met or not; the preset oil supply temperature condition comprises that the oil supply temperature is greater than or equal to the preset oil supply temperature;
the first control module is used for controlling the electric regulating valve to be closed and controlling the oil pump and the oil supply electromagnetic valve to be opened when the preset oil supply temperature condition is not met so as to improve the oil supply temperature through the operation of the oil pump;
the second judgment module is used for acquiring the pressure difference between the oil supply pressure and the suction pressure when the preset oil supply temperature condition is met, and judging whether the pressure difference is greater than or equal to the first preset pressure difference;
the second control module is used for controlling the oil supply electromagnetic valve to be closed and controlling the oil pump and the electric regulating valve to be opened when the pressure difference is smaller than the first preset pressure difference so as to increase the oil supply pressure through the operation of the oil pump;
and the third control module is used for controlling the compressor to start when the pressure difference is greater than or equal to the first preset pressure difference.
12. The apparatus of claim 11, wherein the preset oil supply temperature condition further comprises: the time for which the oil pump continuously operates to increase the oil supply temperature reaches a preset time;
accordingly, when the oil supply temperature is greater than or equal to the preset oil supply temperature, or when the time during which the oil pump continues to operate to increase the oil supply temperature reaches a preset time, it is determined that the preset oil supply temperature condition is satisfied.
13. The apparatus of claim 11 or 12, further comprising:
the fourth control module is used for controlling the oil supply electromagnetic valve to be opened and controlling the oil pump to be closed when the compressor is loaded to a preset lowest load;
and the adjusting module is used for correspondingly adjusting the opening of the electric adjusting valve according to the oil supply quantity required by the compressor.
14. The apparatus of claim 13, further comprising:
the acquisition module is used for acquiring the operation parameters of the refrigeration system in the operation process of the compressor;
and the determining module is used for determining the oil supply quantity required by the compressor according to the operation parameters of the refrigerating system.
15. The apparatus of claim 14, wherein the operating parameters of the refrigeration system include a suction pressure, a discharge pressure, a suction temperature, a discharge temperature, and an operating current of the compressor, and a supply temperature and a supply pressure of the oil supply line.
16. The apparatus of claim 15, wherein the determining module is specifically configured to:
determining the high-low pressure difference of the current working condition according to the suction pressure and the discharge pressure, determining the physical state of suction and discharge according to the suction temperature and the discharge temperature, determining the load of the compressor according to the operating current, and determining the physical state of oil supply according to the oil supply temperature and the oil supply pressure;
and determining the oil supply quantity required by the compressor according to the high-low pressure difference of the current working condition, the physical state of the air suction and exhaust, the load of the compressor and the physical state of the oil supply.
17. The apparatus according to any one of claims 13 to 16,
the third judgment module is used for judging whether the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to a second preset pressure difference in real time in the running process of the compressor;
the fifth control module is used for controlling the oil pump to be in an open state and the oil supply electromagnetic valve to be in a closed state when the pressure difference between the oil supply pressure and the suction pressure is smaller than or equal to the second preset pressure difference; and when the pressure difference between the oil supply pressure and the suction pressure is greater than the second preset pressure difference, controlling the oil pump to be in a closed state, and controlling the oil supply electromagnetic valve to be in an open state.
18. An oil supply controller of a refrigeration system, comprising:
a memory and a processor coupled to the memory;
the memory for storing a program for implementing at least the oil supply control method of the refrigeration system according to any one of claims 4 to 10;
the processor is used for calling and executing the program stored in the memory.
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