Lubricating system of dry screw air compressor and dry screw air compressor

Abstract

The utility model relates to a lubricating system of a dry screw air compressor and the dry screw air compressor, and the lubricating system comprises a main machine, a booster oil pump, a liquid cooling motor, a temperature control valve, an oil cooler, a base, an oil filter, an oil separator, a pressure gauge, an oil temperature sensor, an oil pressure sensor and a three-way piece, the host, the booster oil pump, the liquid cooling motor, the temperature control valve, the oil cooler, the oil filter and the oil separator are sequentially communicated to form oil path circulation, a high-temperature oil outlet of the temperature control valve is communicated with an oil inlet of the oil cooler, and the three-way piece is arranged among a low-temperature bypass port of the temperature control valve, a low-temperature oil outlet of the oil cooler and the oil filter. According to the utility model, the utilization rate of a lubricating system is improved, the frequency of the dry screw air compressor in operation can be lower, the frequency conversion range is wider, the transmission of noise is reduced, the overall dimension of the dry screw air compressor is reduced, the utilization rate of a client air compression station is improved, the material cost of the overall machine is reduced, and the product competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to a lubrication system of a dry screw air compressor and the dry screw air compressor. Background Art

[0002] As far as we know, the driving motor types of dry screw air compressors on the market are mainly split three-phase asynchronous motors and synchronous permanent magnet variable frequency motors. The cooling method of the above two motors is IC411, that is, relying on the coaxial fan or independent fan at the tail of the motor for cooling. Because it relies on the coaxial fan or independent fan at the tail for cooling, it has the following shortcomings:

[0003] 1. It is necessary to reserve a certain gap at the air inlet of the fan at the rear of the motor to ensure the heat dissipation and cooling of the motor, which will increase the length of the motor and the length of the dry screw air compressor, thereby increasing the material cost of the whole machine;

[0004] 2. The coaxial fan or independent fan at the tail of the motor is mostly a 2-stage or 4-stage fan. When it runs at a high speed, the fan blades will continuously beat the air, thus generating fan noise of different decibels, which will increase the noise of the whole machine to a certain extent;

[0005] 3. When the variable frequency motor runs at a low speed, the air volume brought by the coaxial fan at the rear cannot meet the motor's demand for heat dissipation. Therefore, the lower limit frequency of the motor cannot be lower than a certain specified frequency, which limits the variable frequency adjustment range of the dry screw air compressor. Utility Model Content

[0006] The utility model aims to provide a lubrication system for a dry screw air compressor and a dry screw air compressor in view of the defects of high material cost, high noise and small lower frequency range of the motor cooling of the dry screw air compressor in the prior art.

[0007] The utility model solves the above technical problems through the following technical solutions:

[0008] The utility model provides a lubrication system for a dry screw air compressor, which is characterized in that the lubrication system comprises a main engine, a boost oil pump, a liquid-cooled motor, a temperature control valve, an oil cooler, a base, an oil filter, an oil separator, a pressure gauge, an oil temperature sensor, an oil pressure sensor and a three-way piece, the main engine, the boost oil pump, the liquid-cooled motor, the temperature control valve, the oil cooler, the oil filter and the oil separator are connected in sequence to form an oil circuit circulation, the high-temperature oil outlet of the temperature control valve is connected to the oil inlet of the oil cooler, the three-way piece is arranged between the low-temperature bypass port of the temperature control valve, the low-temperature oil outlet of the oil cooler and the oil filter, the three The first port of the through piece is connected to the low-temperature oil outlet of the oil cooler, the second port of the three-way piece is connected to the low-temperature bypass port of the temperature control valve, the third port of the three-way piece is connected to the oil filter, the oil filter is arranged on the base, the oil filter is connected to the third port through the first oil inlet of the base, the oil filter is connected to the oil inlet of the oil separator through the first oil outlet of the base, the oil separator is respectively connected to the primary bearing oil inlet, the secondary bearing oil inlet, the casing oil inlet and the gear oil inlet of the main engine, and the pressure gauge, the oil temperature sensor and the oil pressure sensor are arranged on the oil separator at intervals.

[0009] Preferably, the lubrication system also includes a control device, which is electrically connected to the boost oil pump, the main engine and the oil pressure sensor. When the power button of the dry screw air compressor is turned on, the control device controls the boost oil pump to start. Within a predetermined time, when the lubricating oil pressure detected by the oil pressure sensor received by the control device is greater than or equal to a set value, the control device controls the main engine to start, otherwise the main engine does not start; when the power off button of the dry screw air compressor is pressed, the control device controls the main engine to stop running, and the control device controls the boost oil pump to stop running after delaying running for a set time period.

[0010] Preferably, the boost oil pump is arranged outside the main engine, and a pressure regulating screw is arranged on the pump body of the boost oil pump.

[0011] Preferably, the third oil inlet and the third oil outlet of the liquid-cooled motor are both arranged on the top of the housing of the liquid-cooled motor, and an oil storage chamber is arranged between the third oil inlet and the third oil outlet.

[0012] Preferably, the liquid-cooled motor is a split-type permanent magnet synchronous variable frequency motor.

[0013] Preferably, the oil filter is made of glass fiber, and the bypass opening pressure of the oil filter is a customized low pressure type.

[0014] Preferably, a mounting port is provided at the top of the base, the oil filter is connected to the top of the base through the mounting port, the first oil inlet and the first oil outlet are respectively provided at two ends of the base, and fixing holes and pressure difference transmitter interfaces are provided at intervals at the bottom of the base.

[0015] Preferably, an oil inlet interface is provided at one end of the oil separator, and a casing oil inlet interface is provided at the other end of the oil separator, a first-level bearing oil inlet interface, a second-level bearing oil inlet interface, a gear oil inlet interface and a first reserved interface are provided on the front side of the oil separator, a second reserved interface is provided at the bottom of the oil separator, and a pressure release reserved interface, a pressure gauge interface, an oil temperature sensor interface, an oil pressure sensor interface and a third reserved interface are provided at intervals on the top of the oil separator, and each interface is an internal threaded interface, and the first-level bearing oil inlet interface, the second-level bearing oil inlet interface, the casing oil inlet interface and the gear oil inlet interface are respectively connected to the first-level bearing oil inlet, the second-level bearing oil inlet, the casing oil inlet and the gear oil inlet of the main engine.

[0016] Preferably, the main engine, the boost oil pump, the liquid-cooled motor, the temperature control valve, the oil cooler, the oil filter, and the oil separator are connected in sequence through pipelines, and the three-way piece is connected to the temperature control valve, the oil cooler, and the oil filter through pipelines.

[0017] The utility model also provides a dry screw air compressor, which is characterized in that it comprises the lubrication system of the dry screw air compressor as described above.

[0018] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0019] The positive progressive effects of the utility model are as follows: in the lubrication system of the dry screw air compressor of the utility model, the driving motor uses the lubricating oil in the original oil circuit lubrication system of the dry screw compressor to cool the liquid-cooled motor, and there is no need to separately configure a cooling system and an oil circuit boosting system, thereby improving the utilization rate of the cooling system and the lubrication system of the original unit; since the liquid-cooled motor is cooled by lubricating oil, compared with the conventional IC411 air-cooled motor, there is no need to consider heat dissipation and cooling at lower speeds, so the operating frequency of the dry screw air compressor can be lower and the frequency conversion range is wider; in addition, there is no need to reserve a motor air inlet at the tail of the motor, reducing sheet metal openings, thereby reducing noise transmission; in addition, due to the unique small size advantage of the liquid-cooled motor, the overall size of the air compressor can be reduced, the utilization rate of the customer's air compression station can be improved, the material cost of the whole machine can be reduced, and the product competitiveness can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the lubrication system of the utility model.

[0021] Figure 2 It is a schematic diagram of the structure of the booster oil pump of the utility model.

[0022] Figure 3 It is a structural schematic diagram of the liquid-cooled motor of the utility model.

[0023] Figure 4 It is a structural schematic diagram of the base of the utility model.

[0024] Figure 5 This is a structural schematic diagram of the base of the utility model from another viewing angle.

[0025] Figure 6 It is a structural schematic diagram of the oil separator of the utility model.

[0026] Description of reference numerals:

[0027] Host 1

[0028] Booster oil pump 2

[0029] Second oil outlet 21

[0030] Pressure regulating device 22

[0031] Booster motor 23

[0032] Second oil inlet 24

[0033] Booster pump body 25

[0034] Liquid-cooled motor 3

[0035] The third oil inlet 31

[0036] The third oil outlet 32

[0037] Liquid cooling case 33

[0038] Foot 34

[0039] Motor shaft 35

[0040] Temperature control valve 4

[0041] Oil cooler 5

[0042] Base 6

[0043] First oil inlet 61

[0044] Mounting port 62

[0045] First oil outlet 63

[0046] Fixing hole 64

[0047] Differential pressure transmitter interface 65

[0048] Oil filter 7

[0049] Oil separator 8

[0050] Oil inlet port 801

[0051] First-stage bearing oil inlet port 802

[0052] Gear oil inlet port 803

[0053] Secondary bearing oil inlet port 804

[0054] The first reserved interface 805

[0055] The second reserved interface 806

[0056] Casing oil inlet port 807

[0057] Pressure gauge interface 808

[0058] Oil temperature sensor interface 809

[0059] Oil pressure sensor interface 810

[0060] The third reserved interface 811

[0061] Pressure relief reserved interface 812

[0062] Pressure gauge 9

[0063] Oil temperature sensor 10

[0064] Oil pressure sensor 11

[0065] Pipeline 12

[0066] Tee piece 13 DETAILED DESCRIPTION

[0067] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0068] The utility model discloses a lubrication system for a dry screw air compressor, such as Figure 1-6As shown, the lubrication system includes a main engine 1, a boost oil pump 2, a liquid-cooled motor 3, a temperature control valve 4, an oil cooler 5, a base 6, an oil filter 7, an oil separator 8, a pressure gauge 9, an oil temperature sensor 10, an oil pressure sensor 11 and a three-way piece 13. The main engine 1, the boost oil pump 2, the liquid-cooled motor 3, the temperature control valve 4, the oil cooler 5, the oil filter 7, and the oil separator 8 are connected in sequence to form an oil circuit circulation. The high-temperature oil outlet of the temperature control valve 4 is connected to the oil inlet of the oil cooler 5. The three-way piece 13 is arranged between the low-temperature bypass port of the temperature control valve 4, the low-temperature oil outlet of the oil cooler 5 and the oil filter 7. The first port of the three-way piece 13 The oil filter 7 is connected to the low-temperature oil outlet of the oil cooler 5, the second port of the three-way piece 13 is connected to the low-temperature bypass port of the temperature control valve 4, the third port of the three-way piece 13 is connected to the oil filter 7, the oil filter 7 is arranged on the base 6, the oil filter 7 is connected to the third port through the first oil inlet 61 of the base 6, the oil filter 7 is connected to the oil inlet of the oil separator 8 through the first oil outlet 63 of the base 6, the oil separator 8 is respectively connected to the primary bearing oil inlet, the secondary bearing oil inlet, the casing oil inlet and the gear oil inlet of the main engine 1, and the pressure gauge 9, the oil temperature sensor 10 and the oil pressure sensor 11 are arranged on the oil separator 8 at intervals.

[0069] Specifically, the low-pressure oil inlet of the boost oil pump 2, i.e., the second oil inlet 24, is connected to the oil tank outlet of the main engine 1 through the pipeline 12, the high-pressure oil outlet of the boost oil pump 2, i.e., the second oil outlet 21, is connected to the third oil inlet 31 of the liquid-cooled motor 3 through the pipeline 12, the third oil outlet 32 ​​of the liquid-cooled motor 3 is connected to the oil inlet of the temperature control valve 4 through the pipeline 12, the high-temperature oil outlet of the temperature control valve 4 is connected to the oil inlet of the oil cooler 5 through the pipeline 12, and the low-temperature oil outlet of the oil cooler 5 is collected through the pipeline 12, the tee piece 13 and the low-temperature bypass port of the temperature control valve 4. The oil filter 7 is installed on the top of the base 6 of the oil filter 7 through its own thread. The first oil inlet 61 of the base 6 of the oil filter 7 is connected to the third port of the tee 13 through the thread. The first oil outlet 63 of the base 6 of the oil filter 7 is connected to the oil inlet of the oil separator 8, i.e., the oil inlet interface 801, through the pipeline 12. The pressure gauge 9 is installed at the top of the oil separator 8. The oil temperature sensor 10 and the oil pressure sensor 11 are respectively installed on the side of the oil separator 8. The oil separator 8 is set behind the oil filter 7 and before each oil inlet of the main engine 1. The function of the oil separator 8 is to buffer, stabilize the pressure and branch the lubricating oil inside it to each oil inlet of the main engine 1. The temperature sensor is used to monitor whether the oil supply temperature is within the set range. When the lubricating oil temperature exceeds the specified temperature, an alarm signal is given to the control system. The oil pressure sensor 11 is used to monitor the oil supply pressure of the oil separator 8.

[0070] The working principle of the lubrication system is as follows: when the start button of the dry screw air compressor is pressed, the booster oil pump 2 starts immediately, and the lubricating oil in the oil tank of the main engine 1 is sucked into the pump body of the booster oil pump 2 by the booster oil pump 2, and enters the liquid-cooled motor 3 through the pipeline 12 after being compressed and pressurized. After the lubricating oil is fully cooled by the liquid-cooled motor 3, it enters the oil inlet of the temperature control valve 4 through the pipeline 12; when the lubricating oil temperature is lower than the valve core action temperature of the temperature control valve 4, the temperature control valve 4 is closed at this time, and the lubricating oil directly enters the base 6 of the oil filter 7 through the low-temperature bypass port of the temperature control valve 4; when the lubricating oil When the temperature is higher than the valve core action temperature of the temperature control valve 4, the temperature control valve 4 opens, and the lubricating oil enters the oil cooler 5 through the pipeline 12 for cooling. The cooled lubricating oil enters the base 6 of the oil filter 7 through the pipeline 12; after being filtered by the oil filter 7, the clean lubricating oil enters the oil separator 8, and then is divided into four paths and enters the primary bearing oil inlet, the secondary bearing oil inlet, the casing oil inlet and the gear oil inlet of the main engine 1 through the pipeline 12 respectively; after cooling and lubricating the bearings, gears and the casing of the main engine 1, the lubricating oil returns to the oil tank through the built-in or external oil channel of the body.

[0071] The oil cooler 5 is an aluminum plate-fin cooler, and a pipe section is provided at the upper center of the two side heads, which are the oil inlet and outlet of the oil cooler 5 respectively. A smaller pipe section is provided at the lower center of the right side head, which is the sewage outlet. The oil cooler 5 is an oil storage structure, that is, when the unit stops running, the oil cooler 5 always stores more than 2 / 3 of the volume capacity of lubricating oil, which can protect the oil cooler 5, reduce thermal stress deformation, delay the oxidation process, and quickly establish the required lubrication pressure when the unit starts.

[0072] In this embodiment, the lubrication system also includes a control device, which is electrically connected to the boost oil pump 2, the main engine 1 and the oil pressure sensor 11. When the power button of the dry screw air compressor is turned on, the control device controls the boost oil pump 2 to start. Within a predetermined time, when the control device receives that the lubricating oil pressure detected by the oil pressure sensor 11 is greater than or equal to a set value, the control device controls the main engine 1 to start, otherwise the main engine 1 does not start; when the power button of the dry screw air compressor is pressed, the control device controls the main engine 1 to stop running, and the control device controls the boost oil pump 2 to stop running after delaying the running for a set time period.

[0073] Specifically, its control logic is that after the dry screw air compressor is pressed, within a predetermined time, when the control device receives the oil supply pressure detected by the oil pressure sensor 11 greater than or equal to the set value a, the control device allows the main engine 1 to start, otherwise the control system reports a fault and does not allow the main engine 1 to start; when the dry screw air compressor is operating normally, when the oil pressure sensor monitors that the oil supply pressure is less than the set value b, the control system of the dry screw air compressor reports a fault and stops. The starting logic of the booster oil pump 2 and the main engine 1 is that after the dry screw air compressor start button is pressed, the booster oil pump 2 starts first to establish the required lubricating oil pressure to ensure that the bearings and gears of the main engine 1 are effectively lubricated before the main engine 1 is started; after the dry screw air compressor shutdown button is pressed, the booster oil pump 2 stops running after the main engine 1 stops running for a period of time, that is, after the set time period, so that the lubricating oil in the oil cooler 5, the liquid-cooled motor 3, and the pipeline 12 can continue to circulate, preventing the lubricating oil stored in the casing of the liquid-cooled motor 3 and the main engine 1 from coking and carbonizing due to local high temperature, thereby extending the service life of the lubricating oil.

[0074] In this embodiment, the boost oil pump 2 is arranged outside the main engine 1, and a pressure regulating screw is arranged on the pump body of the boost oil pump 2. Specifically, a boost oil pump 2 is arranged in the lubrication system, which is an independent external oil pump, not an integrated oil pump with the main engine 1. The boost oil pump 2 includes a second oil outlet 21, a pressure regulating device 22, a boost motor 23, a second oil inlet 24, a boost pump body 25 and other structures. The boost motor 23 and the boost pump body 25 of the boost oil pump 2 are an integrated coaxial oil pump, and a pressure regulating screw of lubricating oil, i.e., a pressure regulating device 22, is arranged at the front end of the boost pump body 25. It is a protruding screw structure, which can adjust the outlet pressure of the boost oil pump 2, and has strong flexibility and adaptability. The second oil inlet 24 and the second oil outlet 21 are respectively arranged on both sides of the pump body of the boost oil pump 2, both of which are internal thread structures. When connected to the pipeline 12, the outer periphery of the pipeline 12 is provided with an external thread to cooperate with it.

[0075] In this embodiment, the third oil inlet 31 and the third oil outlet 32 ​​of the liquid-cooled motor 3 are both arranged at the top of the casing of the liquid-cooled motor 3, that is, the top of the liquid-cooled casing 33, and an oil storage chamber is arranged between the third oil inlet 31 and the third oil outlet 32.

[0076] Specifically, the liquid-cooled motor 3 includes a third oil inlet 31, a third oil outlet 32, a liquid-cooled casing 33, a foot 34, a motor shaft 35, etc. The third oil inlet 31 and the third oil outlet 32 ​​of the liquid-cooled motor 3 are both arranged at the top of the liquid-cooled casing 33 of the liquid-cooled motor 3, and the oil storage chamber between the two is inside the liquid-cooled casing 33, which is an oil storage structure, that is, when the boost oil pump 2 stops running, the casing of the liquid-cooled motor 3 is always full of lubricating oil, which promptly takes away the internal heat of the liquid-cooled motor 3, and prevents the liquid-cooled motor 3 from being damaged due to the inability to dissipate heat in a part of the interior.

[0077] In this embodiment, the liquid-cooled motor 3 is a split-type permanent magnet synchronous variable frequency motor.

[0078] Specifically, the driving motor type of the dry screw air compressor is a liquid-cooled motor 3, and its cooling method is to cool the housing, rotor, winding and bearing of the liquid-cooled motor 3 by the lubricating oil in the crude oil system. Because the lubricating oil supply temperature of the dry screw air compressor is only about 50°C, the cooling effect brought by its low oil inlet temperature can fully meet the heat dissipation and cooling needs of the liquid-cooled motor 3; when the heat dissipation and cooling of the liquid-cooled motor 3 are guaranteed, there is no need to worry about the motor cooling problem when running at low speed like an air-cooled motor, so the lower limit of the variable frequency of the liquid-cooled motor 3 can be lower, so that the variable frequency adjustment range of the dry screw air compressor is wider and the ability to adapt to changes in client working conditions is stronger.

[0079] In this embodiment, the material of the oil filter 7 is glass fiber, and the bypass opening pressure of the oil filter 7 is a customized low pressure type.

[0080] In this embodiment, a mounting port 62 is provided at the top of the base 6, and the oil filter 7 is connected to the top of the base 6 through the mounting port 62. The first oil inlet 61 and the first oil outlet 63 are respectively provided at two ends of the base 6, and fixing holes 64 and a pressure difference transmitter interface 65 are provided at intervals at the bottom of the base 6.

[0081] Specifically, the base 6 of the oil filter 7 is an aluminum part, and the two sides thereof are respectively provided with mounting holes, namely, the first oil inlet 61 and the first oil outlet 63, which are respectively connected to the outlet of the front oil cooler 5 and the oil inlet interface 801 of the rear oil separator 8 for oil entry, and are internal thread structures. The bottom of the base 6 is provided with a cylindrical raised pipe section, which is an internal thread structure, and its thread specification is M18*1.5, which is the pressure difference transmitter interface 65 of the lubricating oil, and can be specifically designed according to actual needs; the top of the base 6 is respectively provided with a raised external thread structure, which is the mounting port 62 of the oil filter 7. The oil filter 7 is an internal thread mounting structure, and its bottom sealing method is a plane seal, and its filtering material is a glass fiber material with low pressure loss; it can effectively filter the particles and impurities existing in the liquid cooling housing 33 of the front liquid-cooled motor 3, the oil cooler 5 and the inner wall of the pipeline 12; in addition, the oil filter 7 is a customized low pressure loss and low bypass opening pressure type, which can effectively reduce the resistance of the oil system and the problem of high oil pressure when starting the machine in severe cold weather. The bottom of the oil filter 7 is provided with an internal thread which is installed and adapted with the top external thread of the base 6, with a simple structure and a stable connection. The inside of the oil filter 7 is connected with the first oil inlet 61 and the first oil outlet 63 of the base 6, and the lubricating oil can flow from the first oil inlet 61 to the inside of the oil filter 7 for filtration and flow out through the first oil outlet 63.

[0082] In this embodiment, an oil inlet interface 801 is provided at one end of the oil separator 8, and a casing oil inlet interface 807 is provided at the other end of the oil separator 8. A first-level bearing oil inlet interface 802, a second-level bearing oil inlet interface 804, a gear oil inlet interface 803 and a first reserved interface 805 are provided on the front side of the oil separator 8. A second reserved interface 806 is provided at the bottom of the oil separator 8. A pressure release reserved interface 812, a pressure gauge interface 808, an oil temperature sensor interface 809, an oil pressure sensor interface 810 and a third reserved interface 811 are provided at intervals on the top of the oil separator 8. Each interface is an internal thread interface. The first-level bearing oil inlet interface 802, the second-level bearing oil inlet interface 804, the casing oil inlet interface 807 and the gear oil inlet interface 803 are respectively connected to the first-level bearing oil inlet, the second-level bearing oil inlet, the casing oil inlet and the gear oil inlet of the main engine 1.

[0083] Specifically, the oil separator 8 is a circular tubular welded structure; there is a larger internal threaded mounting hole at the left sealing plate, which is the oil inlet interface 801; there is a smaller internal threaded mounting hole at the right sealing plate, which is the oil outlet, namely the casing oil inlet interface 807; there are 4 cylindrical protruding pipe sections on the top, all of which are internal threaded structures, the larger threaded hole is the pressure relief valve release hole, namely the pressure release reserved interface 812, and the remaining smaller threaded holes are respectively the pressure gauge interface 808, the oil temperature sensor interface 809, the oil pressure sensor interface 810 and the third reserved interface 811; there are 4 cylindrical protruding pipe sections on the front side, all of which are internal threaded structures, the larger threaded holes are respectively the main engine 1 oil inlet interface, namely the first-level bearing oil inlet interface 802, the second-level bearing oil inlet interface 804, and the first reserved interface 805, and the smaller threaded hole is the body center gear lubrication interface, namely the gear oil inlet interface 803, and the above-mentioned interfaces and joints of the oil separator 8 are all connected to the interior of the oil separator 8.

[0084] In this embodiment, the main engine 1, the boost oil pump 2, the liquid-cooled motor 3, the temperature control valve 4, the oil cooler 5, the oil filter 7, and the oil separator 8 are connected in sequence through the pipeline 12, and the three-way piece 13 is connected to the temperature control valve 4, the oil cooler 5 and the oil filter 7 through the pipeline 12. The connection method of each component is mostly threaded connection, and the sealing method is mostly based on the plane sealing of the O / ED ring, which has higher sealing reliability. The pipeline 12 is threadedly connected to each component, which has high reliability.

[0085] The utility model also discloses a dry screw air compressor, which comprises the lubrication system of the dry screw air compressor as above.

[0086] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A lubrication system for a dry screw air compressor, characterized in that: The lubrication system includes a main engine, a boost oil pump, a liquid-cooled motor, a temperature control valve, an oil cooler, a base, an oil filter, an oil separator, a pressure gauge, an oil temperature sensor, an oil pressure sensor and a tee. The main engine, the boost oil pump, the liquid-cooled motor, the temperature control valve, the oil cooler, the oil filter and the oil separator are connected in sequence to form an oil circuit circulation. The high-temperature oil outlet of the temperature control valve is connected to the oil inlet of the oil cooler. The tee is arranged between the low-temperature bypass port of the temperature control valve, the low-temperature oil outlet of the oil cooler and the oil filter. The first port of the tee is connected to the oil cooler. The low-temperature oil outlet of the temperature control valve, the second port of the three-way piece is connected to the low-temperature bypass port of the temperature control valve, the third port of the three-way piece is connected to the oil filter, the oil filter is arranged on the base, the oil filter is connected to the third port through the first oil inlet of the base, the oil filter is connected to the oil inlet of the oil separator through the first oil outlet of the base, the oil separator is respectively connected to the primary bearing oil inlet, the secondary bearing oil inlet, the casing oil inlet and the gear oil inlet of the main engine, and the pressure gauge, the oil temperature sensor and the oil pressure sensor are arranged on the oil separator at intervals.

2. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: The lubrication system also includes a control device, which is electrically connected to the boost oil pump, the main engine and the oil pressure sensor. When the power button of the dry screw air compressor is turned on, the control device controls the boost oil pump to start. Within a predetermined time, when the control device receives that the lubricating oil pressure detected by the oil pressure sensor is greater than or equal to a set value, the control device controls the main engine to start, otherwise the main engine does not start; when the power button of the dry screw air compressor is pressed, the control device controls the main engine to stop running, and the control device controls the boost oil pump to stop running after delaying running for a set time period.

3. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: The boost oil pump is arranged outside the main engine, and a pressure regulating screw rod is arranged on the pump body of the boost oil pump.

4. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: The third oil inlet and the third oil outlet of the liquid-cooled motor are both arranged on the top of the housing of the liquid-cooled motor, and an oil storage chamber is arranged between the third oil inlet and the third oil outlet.

5. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: The liquid-cooled motor is a split-type permanent magnet synchronous variable frequency motor.

6. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: The material of the oil filter is glass fiber, and the bypass opening pressure of the oil filter is a customized low pressure type.

7. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: A mounting port is arranged at the top of the base, and the oil filter is connected to the top of the base through the mounting port. The first oil inlet and the first oil outlet are arranged at two ends of the base respectively, and fixing holes and pressure difference transmitter interfaces are arranged at intervals at the bottom of the base.

8. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: An oil inlet interface is arranged at one end of the oil separator, and a casing oil inlet interface is arranged at the other end of the oil separator. A primary bearing oil inlet interface, a secondary bearing oil inlet interface, a gear oil inlet interface and a first reserved interface are arranged on the front side of the oil separator. A second reserved interface is arranged at the bottom of the oil separator, and a pressure release reserved interface, a pressure gauge interface, an oil temperature sensor interface, an oil pressure sensor interface and a third reserved interface are arranged at intervals on the top of the oil separator. Each interface is an internal thread interface, and the primary bearing oil inlet interface, the secondary bearing oil inlet interface, the casing oil inlet interface and the gear oil inlet interface are respectively connected with the primary bearing oil inlet, the secondary bearing oil inlet, the casing oil inlet and the gear oil inlet of the main engine.

9. The lubrication system for a dry screw air compressor according to claim 1, characterized in that: The main engine, the boost oil pump, the liquid-cooled motor, the temperature control valve, the oil cooler, the oil filter, and the oil separator are connected in sequence through pipelines, and the three-way piece is connected to the temperature control valve, the oil cooler, and the oil filter through pipelines.

10. A dry screw air compressor, characterized in that: It comprises the lubrication system of the dry screw air compressor according to any one of claims 1-9.

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