Oil injection system, control method and related device for compressor

Abstract

The disclosed embodiment provides an oil injection system, a control method and related devices for a compressor, wherein the oil injection system includes a compressor head and an oil-gas separator connected to each other, wherein the oil-gas separator includes at least a first inlet for receiving an oil-gas mixture and a second outlet for discharging oil, wherein the second outlet is connected to a first oil inlet of the compressor head through a first pipeline, wherein the first oil inlet is at least provided at the air inlet of the compressor head, and an electric control valve is provided on the first pipeline, wherein the electric control valve is used to control the amount of oil injected through the first oil inlet. The disclosed embodiment has a simple and practical structure, avoids the problem of shutdown caused by lack of oil in the head during unloading operation, improves the stability of the whole machine operation, can effectively reduce unloading power consumption, reduce the unloading compression ratio, improve the stability of the head, and enhance the energy-saving effect of, for example, a screw compressor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressors, and in particular to an oil injection system, a control method, a control device, a storage medium and an electronic device for a compressor. Background Art

[0002] Due to its own characteristics and the characteristics of customer gas usage, fixed-frequency screw compressors usually need to operate under unloading conditions for 10%-40% of the time. Since unloading conditions do not generate any economic benefits, the unloading power consumption here is generally as low as possible.

[0003] In the prior art, the adjustment of the unloading state in the screw compressor is achieved by reducing the oil sprayed into the head, which is conducive to reducing power consumption. However, due to the long-term use of the screw compressor, if the oil sprayed into the head is reduced, it will often lead to problems such as high temperature of the compressor head, thereby causing abnormal shutdown of the compressor. Therefore, it is very important to find a method with low power consumption and stable operation in the unloading state of the compressor. Summary of the invention

[0004] The purpose of the embodiments of the present disclosure is to provide an oil injection system, a control method and related devices for a compressor to solve the problems existing in the prior art. In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions:

[0005] An embodiment of the present disclosure provides an oil injection system for a compressor, which includes a compressor head and an oil-gas separator connected to each other, the oil-gas separator includes at least a first inlet for receiving an oil-gas mixture and a second outlet for discharging oil, the second outlet is connected to a first oil inlet of the compressor head through a first pipeline, the first oil inlet is at least arranged at the air inlet of the compressor head, and an electric control valve is provided on the first pipeline, and the electric control valve is used to control the amount of oil injected through the first oil inlet.

[0006] In some embodiments, at least an oil cooler and a filter device are provided on the first pipeline.

[0007] In some embodiments, the first oil inlet is disposed on a side of the compressor head.

[0008] In some embodiments, the first pipeline is connected to the second oil inlet of the compressor head by setting an oil inlet branch.

[0009] In some embodiments, the second oil inlet is disposed at a low-pressure end of the compressor head.

[0010] In some embodiments, an auxiliary oil pump is provided on the first pipeline.

[0011] In some embodiments, the oil-gas separator further includes a first outlet for discharging clean air, and the exhaust end of the compressor head is connected to the first inlet of the oil-gas separator through a second pipeline.

[0012] In some embodiments, an oil return pipeline for secondary oil separation is also provided between the compressor head and the oil-gas separator.

[0013] Another aspect of the embodiment of the present disclosure provides a control method for an injection system, wherein the injection system adopts any of the injection systems described above, and the control method includes:

[0014] In response to an unloading control signal of the compressor, controlling the electric control valve to open;

[0015] In response to the loading control signal of the compressor, when the pressure in the oil-gas separator is greater than a safety pressure value, the electric valve is controlled to close.

[0016] In some embodiments, it also includes:

[0017] The auxiliary oil pump is controlled to be turned on a predetermined time before receiving the unloading control signal.

[0018] Another aspect of the embodiment of the present disclosure provides a control device for an injection system, wherein the injection system adopts any of the above-mentioned injection systems, including:

[0019] A first opening control module, used for controlling the electric control valve to open in response to an unloading control signal of the compressor;

[0020] The closing control module is used to control the electric valve to close in response to the loading control signal of the compressor when the pressure in the oil-gas separator is greater than the safety pressure value.

[0021] In some embodiments, it also includes:

[0022] The auxiliary oil pump control module is used to control the auxiliary oil pump to be turned on at a predetermined time before receiving the unloading control signal.

[0023] Another aspect of an embodiment of the present disclosure provides a storage medium, wherein the computer-readable medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0024] Another aspect of an embodiment of the present disclosure provides an electronic device, which includes at least a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned method when executing the computer program on the memory.

[0025] The disclosed embodiment has a simple and practical structure, avoids the problem of shutdown caused by lack of oil in the head during unloading conditions, improves the stability of the whole machine operation, can effectively reduce unloading power consumption, reduce unloading compression ratio, improve the stability of the head, and enhance the energy saving effect of, for example, a screw compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a structural schematic diagram of the fuel injection system of an embodiment of the present disclosure;

[0028] Figure 2 Schematic diagram of the steps of the control method of the fuel injection system according to the embodiment of the present disclosure.

[0029] Reference numerals:

[0030] 1- compressor head; 2- electric control valve; 3- filtering device; 4- oil cooler; 5- oil-gas separator; 6- oil return pipeline; 7- air inlet; 8- first pipeline; 9- second pipeline; 10- oil inlet branch; 51- first outlet; 52- second outlet; 53- first inlet. DETAILED DESCRIPTION

[0031] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0032] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0033] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0034] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0035] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0036] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0037] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0038] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0039] The first embodiment of the present disclosure provides an oil injection system for a compressor, wherein the compressor may be a screw compressor, or any other compressor that uses a single-stage, double-stage, or even multi-stage compression method. The type of compressor is not limited here. Figure 1 As shown, the oil injection system includes a compressor head 1 and an oil-gas separator 5, the compressor head 1 is connected to the oil-gas separator 5 through a pipeline, the oil-gas separator 5 here can be in the form of an oil-gas separation barrel, the high-pressure airflow discharged from the exhaust end of the compressor head 1 enters the oil-gas separator 5 and performs oil-gas separation in the oil-gas separator 5, the oil-gas separation here can be, for example, a cyclone oil-gas separation method. The clean air separated by the oil-gas separator 5 is discharged, and the oil droplets separated by the oil-gas separator 5 are returned to the compressor head 1, so that the compressor head 1 can be supplemented with additional oil.

[0040] Specifically, the oil-gas separator includes a first outlet 51, a second outlet 52 and a first inlet 53, wherein the separated clean air is discharged from the first outlet 51 of the oil-gas separator 5, wherein the first outlet 51 here can be located at the top of the oil-gas separator 5 to facilitate the discharge of gas, and the separated oil droplets fall to the bottom of the oil-gas separator 5 and are discharged through the second outlet 52, wherein the second outlet 52 here is generally located at the bottom of the oil-gas separator 5 and the side wall near the bottom to facilitate the discharge of oil. The oil discharged from the oil-gas separator 5 here can be transmitted back to the compressor head 1 to achieve the reduction of power consumption in the unloaded state and / or lubricate the components in the compressor head 1.

[0041] The second outlet 52 of the oil-gas separator 5 is connected to the first oil inlet of the compressor head 1 through the first pipeline 8, so that the oil separated by the oil-gas separator 5 can be transmitted back to the compressor head 1 through the first pipeline 8, so as to achieve the above-mentioned reduction in unloading power consumption and / or lubricate the components in the compressor head 1.

[0042] The exhaust end of the compressor head 1 is connected to the first inlet 53 of the oil-gas separator 5 through the second pipeline 9, so as to deliver a high-pressure oil-gas mixed flow to the oil-gas separator 5. The first inlet 53 here is generally located at the upper part of the oil-gas separator 5.

[0043] Furthermore, in order to ensure that the oil transmitted back to the compressor head 1 has a lower temperature and fewer impurities, an oil cooler 4 and a filtering device 3 are arranged on the first pipeline 8. The oil cooler 4 is used to reduce the temperature of the oil, which can be achieved by any cooling method, and the filtering device 3 is used to filter impurities in the oil, which can be achieved by any filtering method.

[0044] Furthermore, in order to achieve multiple functions such as reducing unloading power consumption and / or lubricating components in the compressor head 1 by transmitting the oil back to the compressor head 1, the second outlet 52 of the oil-gas separator 5 is connected to at least one oil inlet on the compressor head 1 through the first pipeline 8; wherein, in order to reduce the unloading power consumption of the compressor under unloading conditions, the second outlet 52 is connected to the first oil inlet on the compressor head 1 through the first pipeline 8.

[0045] Specifically, the first oil inlet here can be at least set at the air inlet 7 of the compressor head 1. For example, an oil inlet can be added near the air inlet 7. As a preference, the air inlet 7 can also be set as the first oil inlet to achieve oil intake while intake. This is mainly because the pressure at the air inlet 7 is relatively low, so the difficulty of oil injection can be reduced and the pressure in the oil-gas separator 5 does not need to be maintained at a very high level. In this way, the electric control valve 2 can be controlled to inject oil into the compressor head 1 when the compressor is in an unloading condition. Not only can oil injection be achieved when the oil-gas separator 5 is at a low pressure, thereby reducing the unloading pressure of the oil-gas separator 5, so as to reduce the power consumption during unloading, but also the problem of shutdown caused by lack of oil in the head during unloading condition can be avoided, thereby improving the stability of the whole machine operation.

[0046] Of course, the oil inlet may also be located on the side of the compressor head 1, so as to spray oil into the compressor head 1 to lubricate the internal components. Figure 1In the structure shown in, when there are multiple oil inlets, the second outlet 52 of the oil-gas separator 5 is connected to the first oil inlet through the first pipeline 8, that is, connected to the oil inlet located at the air inlet 7. In addition, the first pipeline 8 is also connected to the second oil inlet located on the side of the compressor head by setting an oil inlet branch 10, so that the second outlet 52 is connected to the oil inlet on the side of the compressor head 1 to spray oil for lubrication. The position of the second oil inlet can be located at the low-pressure end of the compressor head. Of course, in order to improve the lubrication effect on the compressor head, multiple second oil inlets can be set on the side of the compressor head 1, so that the number of the oil inlet branches 10 is also increased accordingly.

[0047] In addition, for some forms of the oil-gas separator 5, for example, when an oil separator core is set in the oil-gas separator 5, an oil return pipeline 6 is also set between the compressor head 1 and the oil-gas separator 5, and the oil return pipeline 6 is used for secondary oil separation return. The high-pressure oil-gas mixed air flow passes through the oil-gas separator 5 to realize a cyclonic oil-gas separation method to realize the first oil-gas separation. The separated oil-gas mixture enters the oil separator core for secondary separation. The oil filtered by the oil separator core enters the oil return pipeline 6 through the pressure valve, and then is sucked into the compressor head 1 to realize secondary oil return.

[0048] Specifically, in order to control the degree of reduction in power consumption of the compressor under unloading conditions, an electric control valve 2 is provided on the first pipeline 8. The electric control valve 2 may be, for example, a solenoid valve. The electric control valve 2 here is used to control the flow rate entering the first oil inlet through the first pipeline 8. In this way, the unloading power consumption of the compressor under unloading conditions can be effectively reduced by injecting oil into the interior of the compressor head 1 through the first oil inlet, for example, at the air inlet 7. Here, the oil injection operation control at the first oil inlet, for example, is implemented by the electric control valve 2. For example, when the compressor enters the unloading condition, the electric control valve 2 is opened and maintained in the open state, so that oil injection into the interior of the compressor head 1 begins through the first oil inlet. Of course, in a preferred embodiment, the opening of the electric control valve 2 can also be adjusted to adjust the amount of oil injected into the interior of the compressor head 1.

[0049] In addition, when the compressor is in an unloading condition, the pressure at the first oil inlet is the lowest because the system does not need to be exhausted. In this way, there is no problem of volumetric efficiency during unloading. Therefore, oil injection at the first oil inlet will never lead to a problem of reducing the efficiency of the entire machine due to heating of the intake gas. In fact, the oil injection here will also reduce the temperature of the hot air delivered from the oil-gas separator 5.

[0050] When the compressor enters the loading condition, the pressure inside the oil-gas separator 5 will increase. When the pressure inside the oil-gas separator 5 is greater than the safety pressure value, where the safety pressure is, for example, 2 bar, the electric control valve 2 is closed to stop supplying oil to the air inlet 7 of the compressor head 1, thereby ensuring that the pressure inside the oil-gas separator 5 remains within a normal range, ensuring the safety of the fuel injection system.

[0051] When the pressure drop in the oil injection system is too large or there are other special requirements, an additional auxiliary oil injection pump can also be added to the oil system. Specifically, for example, an auxiliary oil pump can also be set in the first pipeline 8 to drive the oil in the oil-gas separator 5 to be transmitted back to the compressor head 1 to achieve efficient and safe oil injection. The power consumption of the auxiliary oil pump here is much less than the unloading power consumption, which can greatly reduce the unloading power consumption.

[0052] The disclosed embodiment can further reduce the unloading pressure of the oil-gas separator by introducing additional oil injection at, for example, the air inlet to meet the oil injection amount required when the compressor is in an unloading condition, thereby reducing the unloading power consumption. While reducing the unloading power consumption, it can also improve the energy-saving effect of the compressor and increase the stability of the compressor head during unloading.

[0053] The second embodiment of the present disclosure provides a control method for an oil injection system, which can be applied to a single-stage compression mode, a two-stage compression mode, or a multi-stage compression mode. In particular, the oil injection system in the first embodiment is used to reduce the unloading power consumption of the compressor in an unloading condition, such as Figure 2 As shown, it includes the following steps:

[0054] S101, in response to an unloading control signal of the compressor, controlling an electric control valve to open.

[0055] In this step, in response to the unloading control signal of the compressor, the electric control valve is controlled to open. Here, when the unloading control signal of the compressor is received, that is, when the compressor enters the unloading condition, the required electric control valve 2 is controlled to open, and the electric control valve 2 is adjusted to spray oil into the interior of the compressor head 1 through the first oil inlet of the compressor head 1. Here, the electric control valve 2 can, for example, adjust the amount of oil injection by proportional regulation. In this way, oil injection can be achieved when, for example, the oil-gas separator 5 is under different pressure conditions, especially under low pressure conditions, thereby reducing the unloading pressure of the oil-gas separator 5, so as to reduce the power consumption during unloading.

[0056] In addition, the auxiliary oil pump can be controlled to be turned on at a predetermined time before receiving the unloading control signal. Specifically, the auxiliary oil pump on the first pipeline 8 is turned on at a predetermined time before the compressor enters the unloading condition to ensure that the subsequent oil supply of the injection system is normal. The predetermined time here can be set to 10s, for example. The predetermined time can be determined according to the characteristics of the auxiliary oil pump and the characteristics of the injection system. By turning on the auxiliary oil pump in advance, the injection after the start of unloading can be smoother, and the response time of the injection action is reduced.

[0057] S102, in response to the loading control signal of the compressor, when the pressure in the oil-gas separator is greater than the safety pressure value, controlling the electronically controlled valve to close.

[0058] After the electronically controlled valve is controlled to open in response to the unloading control signal of the compressor in step S101, in this step, in response to the loading control signal of the compressor, when the pressure in the oil-gas separator is greater than the safety pressure value, the electronically controlled valve is controlled to close, thereby stopping the oil supply. That is, when leaving the unloading condition and receiving the loading control signal of the compressor, the compressor enters the loading condition based on the loading control signal, and the pressure inside the oil-gas separator 5 increases. When the pressure inside the oil-gas separator 5 is greater than the safety pressure value, the safety pressure here is, for example, 2 bar, in order to ensure the pressure balance inside the oil-gas separator 5, the electronically controlled valve 2 is controlled to close to stop the oil supply to the air inlet 7 of the compressor head 1.

[0059] The embodiment of the present disclosure can further reduce the unloading pressure of the oil-gas separator by introducing additional oil injection at, for example, the air inlet 7 to meet the oil injection amount required when the compressor is in an unloading condition, thereby reducing the unloading power consumption and improving the energy saving effect of the compressor while reducing the unloading power consumption.

[0060] The disclosed embodiment has a simple and practical structure, avoids the problem of shutdown caused by lack of oil in the head during unloading conditions, improves the stability of the whole machine operation, can effectively reduce unloading power consumption, reduce the unloading compression ratio, improve the stability of the head, and enhance the energy saving effect of, for example, a screw compressor.

[0061] Based on the same technical concept as the above second embodiment, the third embodiment of the present disclosure provides a control device for an injection system, which includes a first opening control module and a closing control module, wherein:

[0062] The first opening control module is used to control the electric control valve to open in response to the unloading control signal of the compressor;

[0063] The closing control module is used to control the electric valve to close in response to the loading control signal of the compressor when the pressure in the oil-gas separator is greater than the safety pressure value.

[0064] Furthermore, the control device further comprises a second start control module, which is used to control the start of the auxiliary oil pump at a predetermined time before receiving the unloading control signal.

[0065] The disclosed embodiment has a simple and practical structure, avoids the problem of shutdown caused by lack of oil in the head during unloading conditions, improves the stability of the whole machine operation, can effectively reduce unloading power consumption, reduce the unloading compression ratio, improve the stability of the head, and enhance the energy saving effect of, for example, a screw compressor.

[0066] A fourth embodiment of the present disclosure provides a storage medium, which is a computer-readable medium and stores a computer program. When the computer program is executed by a processor, the method provided by the second embodiment of the present disclosure is implemented, including the following steps S11 to S12:

[0067] S11, in response to an unloading control signal of the compressor, controlling the electronically controlled valve to open;

[0068] S12, in response to the loading control signal of the compressor, when the pressure in the oil-gas separator is greater than the safety pressure value, controlling the electric valve to close.

[0069] Furthermore, when the computer program is executed by a processor, other methods provided in the second embodiment of the present disclosure are implemented.

[0070] The disclosed embodiment has a simple and practical structure, avoids the problem of shutdown caused by lack of oil in the head during unloading conditions, improves the stability of the whole machine operation, can effectively reduce unloading power consumption, reduce the unloading compression ratio, improve the stability of the head, and enhance the energy saving effect of, for example, a screw compressor.

[0071] The fifth embodiment of the present disclosure provides an electronic device, the electronic device at least comprising a memory and a processor, the memory storing a computer program, the processor implementing the method provided by any embodiment of the present disclosure when executing the computer program on the memory. Exemplarily, the steps of the electronic device computer program are as follows S21 to S22:

[0072] S21, in response to an unloading control signal of the compressor, controlling the electronically controlled valve to open;

[0073] S22, in response to the loading control signal of the compressor, when the pressure in the oil-gas separator is greater than the safety pressure value, controlling the electric valve to close.

[0074] Furthermore, the processor also executes the computer program in the fourth embodiment

[0075] The disclosed embodiment has a simple and practical structure, avoids the problem of shutdown caused by lack of oil in the head during unloading conditions, improves the stability of the whole machine operation, can effectively reduce unloading power consumption, reduce the unloading compression ratio, improve the stability of the head, and enhance the energy saving effect of, for example, a screw compressor.

[0076] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0079] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0080] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0081] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0082] If the integrated module is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned motor torque control method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0083] In addition, the features of the embodiments shown in the drawings of the present application or the various embodiments mentioned in this specification are not necessarily understood as independent embodiments. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0084] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

[0085] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0086] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0087] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0088] Multiple embodiments of the present disclosure are described in detail above, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection required by the present disclosure.

Claims

1. An oil injection system for a compressor, comprising a compressor head and an oil-gas separator connected to each other, wherein the oil-gas separator comprises at least a first inlet for receiving an oil-gas mixture and a second outlet for discharging oil, characterized in that: The second outlet is connected to the first oil inlet of the compressor head through a first pipeline, the first pipeline is connected to the second oil inlet of the compressor head by setting an oil inlet branch, the first oil inlet is at least arranged at the air inlet of the compressor head to reduce the unloading power consumption of the compressor under unloading conditions, an electric control valve is provided on the first pipeline, the electric control valve is used to control the amount of oil injection through the first oil inlet, and the electric control valve is arranged on the pipeline between the connection point of the first pipeline and the oil inlet branch and the first oil inlet.

2. The fuel injection system according to claim 1, characterized in that: At least an oil cooler and a filter device are arranged on the first pipeline.

3. The fuel injection system according to claim 1, characterized in that: The first oil inlet is arranged on the side of the compressor head.

4. The fuel injection system according to claim 1, characterized in that: The second oil inlet is arranged at the low-pressure end of the compressor head.

5. The fuel injection system according to claim 1, characterized in that: An auxiliary oil pump is arranged on the first pipeline.

6. The fuel injection system according to claim 1, characterized in that: The oil-gas separator also includes a first outlet for discharging clean air, and the exhaust end of the compressor head is connected to the first inlet of the oil-gas separator through a second pipeline.

7. The fuel injection system according to claim 1, characterized in that: An oil return pipeline for secondary oil separation is also arranged between the compressor head and the oil-gas separator.

8. A method for controlling a fuel injection system, wherein the fuel injection system adopts the fuel injection system according to any one of claims 1 to 7, characterized in that: include: In response to an unloading control signal of the compressor, controlling the electric control valve to open; In response to the loading control signal of the compressor, when the pressure in the oil-gas separator is greater than the safety pressure value, the electric control valve is controlled to close.

9. The control method according to claim 8, characterized in that: Also includes: The auxiliary oil pump is controlled to be turned on a predetermined time before receiving the unloading control signal.

10. A control device for a fuel injection system, wherein the fuel injection system adopts the fuel injection system according to any one of claims 1 to 7, characterized in that: include: A first opening control module, used for controlling the electric control valve to open in response to an unloading control signal of the compressor; The closing control module is used to control the electric control valve to close in response to the loading control signal of the compressor when the pressure in the oil-gas separator is greater than the safety pressure value.

11. The control device according to claim 10, characterized in that: include: The auxiliary oil pump control module is used to control the auxiliary oil pump to be turned on at a predetermined time before receiving the unloading control signal.

12. A storage medium, characterized in that: The medium stores a computer program, and when the computer program is executed by a processor, the steps of the method according to claim 8 or 9 are implemented.

13. An electronic device, characterized in that: The method comprises at least a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method according to claim 8 or 9 when executing the computer program on the memory.

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