Compressor and additional oil injection system having the same

Abstract

The application discloses a compressor and an additional oil injection system with the same. The compressor has a compression cavity and an exhaust port, the compression cavity and the exhaust port are communicated, the compression cavity has a compression cavity oil inlet, and the exhaust port is provided with an exhaust port oil injection port. According to the compressor, a part of oil can be injected into the compression cavity through the compression cavity oil inlet to seal, lubricate and cool the compression cavity, and another part of oil can be injected into the exhaust port through the exhaust port oil injection port to cool the gas at the exhaust port.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a compressor and an additional oil injection system having the compressor. Background Technology

[0002] Oil-injected screw compressors are widely used in textiles, glass, cement, fermentation and other fields. However, oil-injected screw compressors on the market have high energy consumption and relatively low compression efficiency.

[0003] Existing solutions improve compressor performance by reducing the amount of oil injected into the oil-injected screw compressor, but this leads to problems such as higher compressor outlet temperature and a drastically shortened lubricant life. Simply increasing the amount of oil injected at the compressor head's oil inlet results in high energy consumption and low compression efficiency. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, the present invention proposes a compressor in which a portion of the oil can continue to provide cooling after compression is completed.

[0005] The present invention also proposes an additional oil injection system having the above-described compressor.

[0006] The compressor according to an embodiment of the present invention has a compression chamber and an exhaust port, the compression chamber and the exhaust port are connected, the compression chamber has an oil inlet, and the exhaust port is provided with an oil spray port.

[0007] According to an embodiment of the compressor, a portion of the oil can be sprayed into the compression chamber through the oil inlet of the compression chamber to seal, lubricate and cool the compression chamber; another portion of the oil can be sprayed into the exhaust port through the oil spray nozzle of the exhaust port to cool the gas at the exhaust port.

[0008] According to some embodiments of the present invention, the exhaust port oil injection port is configured as an oil injector, the oil injector is inserted into the exhaust port from one end of the compressor, and the oil injector is provided with a plurality of oil injection holes.

[0009] According to some embodiments of the present invention, the compressor includes: a compressor body and an exhaust end face disposed on the compressor body, the compression chamber is formed in the compressor body, the exhaust port is opened on the exhaust end face, and the exhaust port oil injection port is configured as a plurality of oil injection holes formed on the exhaust end face.

[0010] According to some embodiments of the present invention, the compressor is a single-stage oil-injected screw compressor.

[0011] According to some embodiments of the present invention, the compressor is a single-stage low-pressure oil-injected screw compressor or a single-stage high-pressure oil-injected screw compressor.

[0012] An additional fuel injection system according to another embodiment of the present invention includes: an oil reservoir, a main oil circuit, an oil pump, and the compressor described above. One end of the main oil circuit is connected to the oil reservoir, and the other end of the main oil circuit is connected to a first branch oil circuit and a second branch oil circuit. The first branch oil circuit is connected to the oil inlet of the compression chamber, and the second branch oil circuit is connected to the exhaust port injection port. The oil pump is at least used to provide power for the flow of oil from the oil reservoir to the second branch oil circuit.

[0013] According to some embodiments of the present invention, the oil pump is disposed in the second oil distribution line to drive the oil flow in the second oil distribution line.

[0014] According to some embodiments of the present invention, the oil pump is disposed on the main oil line to drive the oil flow in the first and second branch oil lines.

[0015] According to some embodiments of the present invention, the additional fuel injection system further includes: an overflow circuit, one end of which is connected to the main fuel line and the other end of which is connected to the fuel storage tank. An overflow valve is provided on the overflow circuit, and the overflow valve is configured such that: when the fuel pressure in the overflow circuit exceeds a preset pressure value, the overflow valve opens; and when the fuel pressure in the overflow circuit does not exceed the preset pressure value, the overflow valve closes.

[0016] Optionally, the oil pump is installed on the main oil line, and one end of the overflow circuit is connected to the oil outlet of the oil pump.

[0017] According to some embodiments of the present invention, a flow regulating valve is provided on the second oil distribution line, and the valve opening of the flow regulating valve is adjustable.

[0018] Furthermore, the additional fuel injection system also includes a temperature sensing element and a controller. The temperature sensing element is used to detect the temperature of the gas discharged from the exhaust port. The temperature sensing element and the flow regulating valve are both electrically connected to the controller. The controller is adapted to adjust the valve opening of the flow regulating valve according to the gas temperature information detected by the temperature sensing element.

[0019] According to some embodiments of the present invention, an oil cooler is also provided on the main oil line.

[0020] According to some embodiments of the present invention, the oil storage tank is an oil-gas separator, and the exhaust port is also connected to the oil storage tank through an exhaust pipe.

[0021] According to some embodiments of the present invention, the oil storage tank is an oil-gas separator, and the oil separator core of the oil-gas separator is also connected to the compression chamber through an oil return circuit.

[0022] According to some embodiments of the present invention, an oil filter is also provided on the main oil line.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a compressor according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of a compressor according to another embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of an additional fuel injection system according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of an additional fuel injection system according to another embodiment of the present invention.

[0028] Figure label:

[0029] Compressor 1, Compression chamber 11, Exhaust port 12, Exhaust port oil injection port 13, Compressor body 14, Exhaust end face 15, Oil injector 16, Compression chamber oil inlet 18, Flow regulating valve 2, Oil filter 3, Overflow valve 4, Oil pump 5, Oil cooler 6, Oil tank 7, Oil separator core 8, Main oil circuit 10, First oil distribution circuit 20, Second oil distribution circuit 30, Overflow circuit 40, Exhaust pipe 50, Pipeline 60, Circuit 70. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] The following is combined with Figures 1-4 The compressor 1 according to an embodiment of the present invention is described in detail.

[0034] Reference Figures 1-2 As shown, the compressor 1 according to an embodiment of the present invention has a compression chamber 11 and an exhaust port 12. The compression chamber 11 is provided with a compression component for compressing gas. The compression chamber 11 has a compression chamber oil inlet 18. When oil is injected into the compressor 1, a portion of the oil is sprayed into the compression chamber 11 through the compression chamber oil inlet 18 to lubricate and cool the compression component in the compression chamber 11, cool the gas in the compression chamber 11, and seal a portion of the structure in the compression chamber 11.

[0035] The compression chamber 11 is connected to the exhaust port 12. An exhaust port oil spray nozzle 13 is provided at the exhaust port 12. Another part of the oil is sprayed to the exhaust port 12 through the exhaust port oil spray nozzle 13 to cool the compressed gas at the exhaust port 12. In other words, this oil can continue to provide cooling for the compressed gas after the gas compression is completed.

[0036] According to an embodiment of the present invention, the compressor 1, by providing an oil inlet 18 for the compression chamber, allows a portion of the oil to be sprayed into the compression chamber 11 through the oil inlet 18 to seal, lubricate, and cool the compression chamber 11. By additionally providing an oil spray nozzle 13 at the exhaust port 12, a portion of the oil can be sprayed into the exhaust port 12 through the oil spray nozzle 13 to cool the compressed gas at the exhaust port 12, reducing the outlet temperature of the compressor 1, and consequently reducing the oil temperature. This allows the oil to operate at its optimal temperature, significantly extending its service life. Furthermore, this separate oil spraying fully utilizes the characteristics of compression and cooling, maximizing the cooling effect, reducing mechanical losses, and improving the operating efficiency of the compressor 1.

[0037] In some embodiments of the present invention, reference is made to... Figure 1As shown, the exhaust port oil nozzle 13 is constructed as an oil injector 16. The oil injector 16 extends from the end of the compressor 1 near the exhaust port 12 and is inserted into the exhaust port 12. The oil injector 16 has multiple injection holes. Oil can be sprayed to the exhaust port 12 through the multiple injection holes to cool the compressed gas at the exhaust port 12. In addition, the multiple injection hole structure also helps to reduce the diameter of the injection holes, thereby increasing the force of the oil spray, so as to form convection with the compressed gas at the exhaust port 12 and improve the cooling effect on the compressed gas.

[0038] Optionally, the fuel injector 16 can be constructed as a rod-shaped structure, a bent structure, or other shapes. The length extension direction of the fuel injector 16 is suitable to be perpendicular to or at a certain angle to the exhaust direction of the exhaust port 12. When the compressed gas at the exhaust port 12 is discharged from top to bottom, the oil sprayed from the injection hole on the fuel injector 16 can be in a bottom-up direction, thereby forming convection with the compressed gas to further improve the cooling effect on the compressed gas.

[0039] In some embodiments of the present invention, reference is made to... Figure 2 As shown, the compressor 1 may include: a compressor body 14 and an exhaust end face 15. The compression chamber 11 is formed in the compressor body 14. For example, in some embodiments, the exhaust end face 15 and the compressor body 14 are a single housing. In some embodiments, the exhaust end face 15 and the compressor body 14 can be fixedly connected by screws and are easy to disassemble, so as to facilitate maintenance and repair of the exhaust end face 15, the compressor body 14, and the compression components in the compression chamber 11.

[0040] The exhaust port 12 is located on the exhaust end face 15, and the exhaust port oil injection port 13 is constructed as multiple oil injection holes formed on the exhaust end face 15. Similarly, oil can be sprayed to the exhaust port 12 through the multiple oil injection holes to cool the compressed gas at the exhaust port 12. In addition, the multiple oil injection hole structure also helps to reduce the diameter of the oil injection holes, thereby increasing the force of the oil spray, so as to form convection with the compressed gas at the exhaust port 12 and improve the cooling effect on the compressed gas.

[0041] Optionally, the axis of the fuel injection hole can be perpendicular to the exhaust direction of the exhaust port 12. When the compressed gas at the exhaust port 12 is discharged from top to bottom, the oil sprayed from the fuel injection hole can be injected from the side against the compressed gas, thereby creating a counter-current.

[0042] In some optional embodiments of the present invention, compressor 1 is a single-stage oil-injected screw compressor.

[0043] For example, in some optional embodiments of the present invention, compressor 1 is a single-stage low-pressure oil-injected screw compressor. Even if the compressor performance is improved by reducing the amount of oil injected in the single-stage low-pressure oil-injected screw compressor, because an exhaust port oil injection port 13 is provided at the exhaust port 12, a portion of the oil is sprayed to the exhaust port 12 through the exhaust port oil injection port 13 to cool the compressed gas at the exhaust port 12, reduce the outlet temperature of the single-stage low-pressure oil-injected screw compressor, and thus reduce the temperature of the oil, so that the oil works at the optimal temperature condition, greatly extending the working life of the oil, and avoiding the problems of high energy consumption and low compression efficiency caused by simply increasing the amount of oil injected at the oil inlet 18 of the compressor head's compression chamber.

[0044] For example, in some alternative embodiments of the present invention, compressor 1 is a single-stage high-pressure oil-injected screw compressor. Even if the compressor performance is improved by reducing the amount of oil injected in the single-stage high-pressure oil-injected screw compressor, because an exhaust port oil injection port 13 is provided at the exhaust port 12, a portion of the oil is sprayed to the exhaust port 12 through the exhaust port oil injection port 13 to cool the compressed gas at the exhaust port 12, thereby reducing the outlet temperature of the single-stage high-pressure oil-injected screw compressor and thus reducing the temperature of the oil. This allows the oil to operate at the optimal temperature, greatly extending the service life of the oil. It also avoids the problems of high energy consumption and low compression efficiency caused by simply increasing the amount of oil injected at the oil inlet 18 of the compressor head's compression chamber.

[0045] Reference Figures 3-4 As shown, an additional fuel injection system according to another embodiment of the present invention may include: an oil reservoir 7, a main oil circuit 10, an oil pump 5, and a compressor 1 as described in the above embodiment.

[0046] One end of the main oil passage 10 is connected to the oil storage tank 7, and the other end of the main oil passage 10 is connected to the first branch oil passage 20 and the second branch oil passage 30. The first branch oil passage 20 is connected to the oil inlet 18 of the compression chamber, and the second branch oil passage 30 is connected to the oil spray nozzle 13 of the exhaust port. That is to say, the oil storage tank 7 can reach the main oil passage 10. Part of the oil in the main oil passage 10 reaches the oil inlet 18 of the compression chamber through the first branch oil passage 20, and then enters the compression chamber 11 to seal, lubricate and cool the compression chamber 11; the other part reaches the oil spray nozzle 13 of the exhaust port through the second branch oil passage 30, and is sprayed from the oil spray nozzle 13 to the exhaust port 12 to cool the compressed gas at the exhaust port 12.

[0047] The oil pump 5 is used at least to provide power for the flow of oil from the oil storage tank 7 to the second oil distribution line 30. In some optional embodiments of the invention, the oil pump 5 may be a stand-alone oil pump. In other optional embodiments of the invention, the oil pump 5 may be an oil pump integrated with the compressor head.

[0048] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In some embodiments of the present invention, reference is made to... Figure 3 As shown, oil pump 5 is installed on the second oil distribution line 30. When oil pump 5 is working, it can drive the flow of oil in the second oil distribution line 30. That is to say, oil pump 5 can provide the power to drive the oil from the oil storage tank 7 to the second oil distribution line 30. The function of oil pump 5 installed on the second oil distribution line 30 is only to provide sufficient pressure differential for oil injection at the exhaust port 12.

[0050] Compared to setting the oil pump 5 on the main oil circuit 10, setting the oil pump 5 on the second branch oil circuit 30 is beneficial to reducing the power consumption of the oil pump 5.

[0051] In some embodiments of the present invention, reference is made to... Figure 4 As shown, the oil pump 5 is installed on the main oil circuit 10. When the oil pump 5 is working, it can drive the flow of oil in the first branch oil circuit 20 and the second branch oil circuit 30. That is to say, the oil pump 5 can provide the power to drive the oil from the oil storage tank 7 to the first branch oil circuit 20 and the second branch oil circuit 30.

[0052] In some embodiments of the present invention, reference is made to... Figures 3-4 As shown, the additional fuel injection system may also include an overflow circuit 40, one end of which is connected to the main fuel line 10 and the other end of which is connected to the fuel storage tank 7 to recover excess fuel in the main fuel line 10. In other words, excess fuel in the main fuel line 10 can flow back to the fuel storage tank 7 through the overflow circuit 40.

[0053] Furthermore, an overflow valve 4 is installed on the overflow circuit 40. The overflow valve 4 is configured such that when the oil pressure in the overflow circuit 40 exceeds a preset pressure value, the overflow valve 4 opens, allowing the main oil line 10 and the oil storage tank 7 to be connected through the overflow circuit 40, and excess oil in the main oil line 10 can flow back to the oil storage tank 7 through the overflow circuit 40. When the oil pressure in the overflow circuit 40 does not exceed the preset pressure value, the overflow valve 4 closes, preventing excess oil in the main oil line 10 from flowing back to the oil storage tank 7 through the overflow circuit 40. The preset pressure value can be set according to the user's actual needs.

[0054] Optionally, oil pump 5 is installed on the main oil circuit 10, and one end of the overflow circuit 40 is connected to the oil outlet of oil pump 5. The oil pressure at the oil outlet of oil pump 5 is relatively high. When the oil pressure at the oil outlet of oil pump 5 exceeds the preset pressure value, the overflow valve 4 opens; when the oil pressure at the oil outlet of oil pump 5 does not exceed the preset pressure value, the overflow valve 4 closes. Due to the variation in the outlet pressure of compressor 1 under various operating conditions, in order to ensure the constant pressure of the additional fuel injection system and the safety of the additional fuel injection system, an overflow valve 4 needs to be added to the oil outlet of oil pump 5.

[0055] In some embodiments of the present invention, a flow regulating valve 2 is provided on the second oil distribution line 30, and the valve opening of the flow regulating valve 2 is adjustable. That is, by adjusting the valve opening of the flow regulating valve 2, the amount of oil reaching the exhaust port injection port 13 can be adjusted, thereby adjusting the amount of oil injected from the exhaust port injection port 13 to the exhaust port 12.

[0056] Furthermore, the additional fuel injection system may also include a temperature sensing element and a controller. The temperature sensing element is used to detect the temperature of the gas discharged from the exhaust port 12. Both the temperature sensing element and the flow regulating valve 2 are electrically connected to the controller, for example, through circuit 70. The controller is adapted to adjust the valve opening of the flow regulating valve 2 according to the gas temperature information detected by the temperature sensing element, so as to realize intelligent control of the additional fuel injection system. For example, when the gas temperature detected by the temperature sensing element exceeds a preset temperature value, the valve opening of the flow regulating valve 2 is increased to increase the amount of fuel reaching the exhaust port injection port 13, thereby increasing the amount of fuel injected from the exhaust port injection port 13 to the exhaust port 12. The preset temperature value can be set according to the user's actual needs, such as 30℃, 45℃, etc.

[0057] Alternatively, the temperature sensing element may be a temperature sensor.

[0058] In some embodiments of the present invention, an oil cooler 6 is also provided on the main oil circuit 10, which is used to cool the oil in the main oil circuit 10.

[0059] In some embodiments of the present invention, the oil storage tank 7 is an oil-gas separator, and the exhaust port 12 is also connected to the oil storage tank 7 through an exhaust pipe 50.

[0060] In some embodiments of the present invention, the oil storage tank 7 is an oil-gas separator, and the oil separator core of the oil-gas separator is also connected to the compression chamber 11 through the oil return circuit 60. Excess oil from the oil-gas separator can enter the compression chamber 11 through the oil return circuit 60.

[0061] In some embodiments of the present invention, an oil filter 3 is also provided on the main oil passage 10. Figure 4In the illustrated embodiment, the oil pump 5 is mounted on the second oil distribution line 30, and the oil filter 3 is located upstream of the oil pump 5. Figure 4 In the embodiment shown, the oil pump 5 is installed on the main oil circuit 10, and the oil filter 3 is installed at the oil outlet of the oil pump 5, that is, the oil filter 3 is located downstream of the oil pump 5. In this way, impurities from the oil pump 5 will not be carried to the compression chamber 11 and damage the meshing rotor, nor will they be carried to the exhaust port injection port 13 and block the exhaust port injection port 13.

[0062] Reference Figure 4 The additional fuel injection system shown includes an oil reservoir 7, a main oil line 10, an oil pump 5, and a compressor 1. One end of the main oil line 10 is connected to the oil reservoir 7, and the other end of the main oil line 10 is connected to the first branch oil line 20 and the second branch oil line 30. An oil cooler 6, an oil pump 5, and an oil filter 3 are sequentially installed on the main oil line 10.

[0063] The operation of the additional oil injection system can be as follows: the oil from the oil-gas separator 7 enters the main oil circuit 10, is first cooled by the oil cooler 6, then pressurized by the oil pump 5 and then passed through the oil filter 3, and finally sprayed into the compressor 1 in two paths: a small portion passes through the first oil distribution circuit 20 to the oil inlet 18 of the compression chamber, and then enters the compression chamber 11, the purpose of which is to lubricate, seal and partially cool the compression chamber 11; the remaining majority of the oil passes through the second oil distribution circuit 30 to the exhaust port spray nozzle 13, and is sprayed from the exhaust port spray nozzle 13 to the exhaust port 12, the main purpose of which is to cool the compressed air, and also to seal the head gap.

[0064] The amount of oil injected from the exhaust port 13 to the exhaust port 12 depends on the operating conditions of the compressor 1, mainly the compressor 1's speed, pressure ratio, intake air temperature, and oil injection temperature. Control is achieved by directly detecting the temperature of the gas discharged from the exhaust port 12, or by detecting the exhaust temperature of the oil reservoir 7. The injected oil ensures that the exhaust temperature is controlled within the optimal range (the specific range is determined by the operating conditions of the compressor 1 and user requirements). Additional oil injection can also be designed based on the maximum required injection volume.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0066] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An additional fuel injection system, characterized in that, include: The compressor (1) is a single-stage oil-injected screw compressor. The compressor (1) has a compression chamber (11) and an exhaust port (12). The compression chamber (11) and the exhaust port (12) are connected. The compression chamber (11) has a compression chamber oil inlet (18). An exhaust port oil injection port (13) is provided at the exhaust port (12). Oil storage tank (7); The main oil passage (10) is connected at one end to the oil storage tank (7), and at the other end of the main oil passage (10) are connected to the first branch oil passage (20) and the second branch oil passage (30). The first branch oil passage (20) is connected to the oil inlet (18) of the compression chamber, and the second branch oil passage (30) is connected to the oil spray port (13) of the exhaust port. An oil pump (5) is provided at least to provide power for the flow of oil from the oil storage tank (7) to the second oil distribution line (30); the oil pump (5) is only provided on the second oil distribution line (30) to drive the flow of oil in the second oil distribution line (30); It also includes: an oil overflow circuit (40), one end of which is connected to the main oil circuit (10), and the other end of which is connected to the oil storage tank (7). An overflow valve (4) is provided on the oil overflow circuit (40). The overflow valve (4) is configured such that: when the oil pressure in the oil overflow circuit (40) exceeds a preset pressure value, the overflow valve (4) opens; when the oil pressure in the oil overflow circuit (40) does not exceed the preset pressure value, the overflow valve (4) closes. The compressor (1) includes: a compressor body (14) and an exhaust end face (15) disposed on the compressor body (14), the compression chamber (11) is formed in the compressor body (14), the exhaust port (12) is opened on the exhaust end face (15), and the exhaust port oil injection port (13) is constructed as a plurality of oil injection holes formed on the exhaust end face (15).

2. The additional fuel injection system according to claim 1, characterized in that, The compressor (1) is a single-stage low-pressure oil-injected screw compressor or a single-stage high-pressure oil-injected screw compressor.

3. The additional fuel injection system according to claim 1, characterized in that, The second oil distribution circuit (30) is equipped with a flow regulating valve (2), and the valve opening of the flow regulating valve (2) is adjustable.

4. The additional fuel injection system according to claim 3, characterized in that, Also includes: A temperature sensing element and a controller are provided. The temperature sensing element is used to detect the temperature of the gas discharged from the exhaust port (12). The temperature sensing element and the flow regulating valve (2) are electrically connected to the controller. The controller is adapted to adjust the valve opening of the flow regulating valve (2) according to the gas temperature information detected by the temperature sensing element.

5. The additional fuel injection system according to claim 1, characterized in that, An oil cooler (6) is also installed on the main oil circuit (10).

6. The additional fuel injection system according to claim 1, characterized in that, The oil storage tank (7) is an oil-gas separator, and the exhaust port (12) is connected to the oil storage tank (7) through an exhaust pipe (50).

7. The additional fuel injection system according to claim 1, characterized in that, The oil storage tank (7) is an oil-gas separator, and the oil separator core of the oil-gas separator is also connected to the compression chamber (11) through the oil return circuit (60).

8. The additional fuel injection system according to claim 1, characterized in that, An oil filter (3) is also installed on the main oil circuit (10).

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