Exhaust system of oil injection screw compressor

Abstract

The utility model discloses an exhaust system of an oil injection screw compressor, which relates to the technical field of exhaust treatment of oil injection screw compressors, and comprises an oil injection screw compressor, a gas cooler, a gas-liquid separator and an exhaust port which are communicated in sequence, and further comprises a bypass pipeline, one end of the bypass pipeline is communicated between the oil injection screw compressor and the gas cooler, the other end of the bypass pipeline is communicated between the gas-liquid separator and the exhaust port and forms a mixed flow end, and the bypass pipeline is further provided with a control assembly used for controlling the opening degree of the bypass pipeline. The problem that condensate water is separated out due to the fact that high-pressure saturated gas formed by a rear-end system of the oil injection screw compressor is affected by temperature reduction of the conveying pipeline, and then the conveying pipeline is damaged by the condensate water is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil-injected screw compressor exhaust treatment, in particular to an oil-injected screw compressor exhaust system. BACKGROUND

[0002] The oil-injected screw compressor adopts screw movement and oil seal technology to compress gas from low pressure to high pressure. In the process of gas compression, water in the gas may be precipitated and cause lubricating oil to be emulsified. In order to prevent this, the prior art controls water vapor in the gas to be in the gas phase by increasing the exhaust temperature of the oil-injected screw compressor. At this time, the rear-end system components of the oil-injected screw compressor cannot withstand the exhaust temperature of the oil-injected screw compressor, so the exhaust of the oil-injected screw compressor needs to be cooled. However, if the cooling temperature is reduced too much, water in the gas will be precipitated, causing the rear-end system to condense liquid, and even causing damage. Therefore, the prior art cools the exhaust of the oil-injected screw compressor, and then discharges the high-pressure gas to a gas-liquid separator. At this time, the gas discharged from the gas-liquid separator is saturated gas.

[0003] In view of the prior art, the inventors believe that the following defects exist: During pipeline transportation, the temperature is reduced, which causes the high-pressure saturated gas formed by the rear-end system of the oil-injected screw compressor to precipitate condensate water, and the condensate water causes the rear-end transportation pipeline to be damaged. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problem that the high-pressure saturated gas formed by the rear-end system of the oil-injected screw compressor is affected by the temperature reduction of the transportation pipeline to precipitate condensate water, which in turn causes the condensate water to damage the transportation pipeline, the present application provides an oil-injected screw compressor exhaust system.

[0005] The oil-injected screw compressor exhaust system provided by the present application adopts the following technical scheme:

[0006] An oil-injected screw compressor exhaust system, comprising an oil-injected screw compressor, a gas cooler, a gas-liquid separator and an exhaust port which are sequentially and communicatively arranged, and further comprising a bypass pipeline, one end of the bypass pipeline being communicatively arranged between the oil-injected screw compressor and the gas cooler, the other end of the bypass pipeline being communicatively arranged between the gas-liquid separator and the exhaust port and being formed into a mixed flow end, and a control assembly for controlling the opening degree of the bypass pipeline being further arranged on the bypass pipeline.

[0007] By adopting the technical scheme, low-pressure gas enters the oil-injected screw compressor first to form high-temperature and high-pressure gas, part of the high-temperature and high-pressure gas enters the gas cooler to be cooled, the cooled gas is separated into condensed water and high-pressure gas by the gas-liquid separator, and the other part of the high-pressure gas enters the branch pipeline, the two parts of gas are mixed at the mixing end to form superheated gas, and the superheated gas is finally discharged to the exhaust port; the gas cooler is arranged to reduce the temperature of the high-pressure gas and protect the conveying pipeline from being damaged by the high-temperature gas, the gas-liquid separator is arranged to separate the condensed water, so that the condensed water does not damage the conveying pipeline, the branch pipeline is arranged to stabilize the properties of the discharged high-pressure gas, so that the condensed water is not separated out due to the reduction of the temperature, and the rear-end conveying pipeline is not damaged due to liquid condensation, so that the equipment can be protected.

[0008] Optionally, the control assembly comprises an adjusting valve arranged on the branch pipeline, a controller for controlling the opening degree of the adjusting valve, and a temperature transmitter arranged between the exhaust port and the mixing end and used for detecting the pressure dew point temperature of the mixed gas, the temperature transmitter is in signal connection with the controller, and the controller receives the signal of the temperature transmitter to control the opening degree of the valve disc of the adjusting valve.

[0009] By adopting the technical scheme, the temperature transmitter detects the pressure dew point temperature of the mixed gas and converts the temperature signal into an electric signal, the electric signal is transmitted to the controller, the controller determines the deviation between the preset value and the actual value, calculates the execution action according to the deviation, and the actuator of the adjusting valve receives the signal from the controller to automatically adjust the opening degree of the valve disc of the adjusting valve, so that the flow of the high-temperature and high-pressure gas flowing through the adjusting valve is controlled, the high-temperature and high-pressure gas flowing through the adjusting valve heats the cooled high-pressure gas, and the mixed gas discharged from the mixing end is superheated gas. The control assembly is arranged to control the opening degree of the branch pipeline, so as to control the flow of the high-temperature and high-pressure gas flowing through the adjusting valve.

[0010] Optionally, an oil-gas separator is arranged between the gas outlet of the oil-injected screw compressor and the gas inlet of the branch pipeline, and an oil return pipeline for recycling the lubricating oil is arranged between the oil-gas separator and the oil-injected screw compressor.

[0011] By adopting the technical scheme, the high-pressure gas discharged from the oil-injected screw compressor contains a small amount of lubricating oil, the oil-gas separator is arranged to effectively separate the lubricating oil and the high-pressure gas, improve the quality of the high-pressure gas, and the oil return pipeline is arranged to realize the recycling of the lubricating oil.

[0012] Optionally, the oil return pipeline is sequentially and in communication with an oil cooler for reducing the temperature of the lubricating oil and an oil filter for filtering impurities in the lubricating oil, and the oil inlet of the oil cooler is in communication with the oil outlet of the oil-gas separator.

[0013] By adopting the above technical scheme, the oil cooler can reduce the temperature of the lubricating oil, prevent the lubricating oil pipeline from being damaged due to the excessively high temperature of the lubricating oil, and the oil filter can filter impurities and small particles in the lubricating oil, prevent the impurities in the lubricating oil from causing wear of the screw rod of the oil-injected screw compressor, and thus prolong the service life of the oil-injected screw compressor.

[0014] Optionally, an oil return check valve is arranged between the oil filter and the oil return port of the oil-injected screw compressor, and the oil return check valve is arranged on the oil return pipeline and used for controlling the one-way flow of the lubricating oil.

[0015] By adopting the above technical scheme, the oil return check valve is arranged to make the lubricating oil flow from the oil outlet of the oil filter to the oil inlet of the oil-injected screw compressor through the oil return check valve, prevent the lubricating oil of the oil-injected screw compressor from flowing back to the oil filter in the reverse direction, ensure the one-way flow and effective circulation of the lubricating oil, and improve the working efficiency of the oil-injected screw compressor.

[0016] In summary, the present application has at least one of the following beneficial technical effects:

[0017] 1. The low-pressure gas first enters the oil-injected screw compressor to compress high-temperature and high-pressure gas, part of the high-temperature and high-pressure gas enters the gas cooler to cool, and the cooled gas passes through the gas-liquid separator to separate condensed water and high-pressure gas, and the other part of the high-pressure gas enters the branch pipeline, the two parts of gas are mixed at the mixing end to form superheated gas, and the superheated gas is finally discharged to the exhaust port; the gas cooler can reduce the temperature of the high-pressure gas, protect the conveying pipeline from being damaged by the high-temperature gas, the gas-liquid separator can separate the condensed water, so that the condensed water does not damage the conveying pipeline, the branch pipeline can make the discharged high-pressure gas stable in nature, and the condensed water is not separated out due to the reduction of the temperature, and the rear-end conveying pipeline is not damaged, so that the equipment can be protected;

[0018] 2. The temperature transmitter detects the pressure dew point temperature of the mixed flow gas and converts the temperature signal into an electric signal, which is transmitted to the controller. The controller determines the deviation between the preset value and the actual value, and calculates the execution action according to the deviation. The actuator of the regulating valve receives the signal from the controller and automatically adjusts the opening of the valve disc of the regulating valve according to the signal, so as to control the flow of the high-temperature and high-pressure gas flowing into the bypass pipeline, so that the high-temperature and high-pressure gas passing through the regulating valve heats the cooled high-pressure gas. At this time, the mixed gas discharged from the mixing end is superheated gas. The control assembly is arranged to control the opening of the bypass pipeline, thereby controlling the flow of the high-temperature and high-pressure gas passing through the regulating valve.

[0019] 3. The high-pressure gas discharged from the oil-injected screw compressor contains a small amount of lubricating oil. The oil-gas separator is arranged to effectively separate the lubricating oil and the high-pressure gas, thereby improving the quality of the high-pressure gas. The oil return pipeline is arranged to realize the recycling of the lubricating oil. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a schematic diagram of the exhaust system of the oil-injected screw compressor in embodiment 1 of the present application.

[0022] Figure 2 is a schematic diagram of the control assembly in embodiment 1 of the present application.

[0023] Figure 3 is a schematic diagram of the exhaust system of the oil-injected screw compressor in embodiment 2 of the present application.

[0024] Figures: 1, oil-injected screw compressor; 2, gas cooler; 3, gas-liquid separator; 4, exhaust port; 5, bypass pipeline; 6, mixing end; 7, control assembly; 8, regulating valve; 9, controller; 10, temperature transmitter; 11, oil-gas separator; 12, oil return pipeline; 13, oil cooler; 14, oil filter; 15, oil return check valve. DETAILED DESCRIPTION

[0025] The following will be described in combination with the drawings Figures 1-3 The present application will be further described in detail.

[0026] The present application discloses an exhaust system of an oil-injected screw compressor.

[0027] Embodiment 1

[0028] ReferenceFigure 1 The exhaust system of the oil-injected screw compressor comprises the oil-injected screw compressor 1, the gas cooler 2, the gas-liquid separator 3 and the exhaust port 4 which are sequentially communicated, and the different components are communicated through the gas conveying pipeline. The low-pressure gas first enters the oil-injected screw compressor 1. Since the oil-injected screw compressor 1 causes the water in the gas to be separated out during the compression process, the lubricating oil is emulsified, so the exhaust temperature is increased by 20℃ higher than the water dew point temperature, so that the water vapor in the gas is in the gas phase, at this time the high-temperature and high-pressure gas is discharged from the gas outlet of the oil-injected screw compressor 1.

[0029] With reference to Figure 1 The high-temperature and high-pressure gas is discharged into the conveying pipeline, but the conveying pipeline cannot withstand the stress under high temperature and thus causes the conveying pipeline to be broken, so the high-temperature and high-pressure gas needs to be cooled. The gas cooler 2 is arranged on the gas conveying pipeline, the gas cooler 2 is provided with a cooling water inlet and a cooling water outlet, the cooling water flows in the gas cooler 2 and exchanges heat with the high-temperature and high-pressure gas, so as to reduce the gas temperature. During the cooling process, too much temperature reduction will cause the high-pressure gas to form condensed water and separate out, and the separated condensed water will cause damage to the gas conveying pipeline, so the gas-liquid separator 3 is arranged. The condensed water separated out by the gas-liquid separator 3 will settle to the bottom of the gas-liquid separator 3 under the action of gravity and be discharged through the liquid discharge port of the gas-liquid separator 3, and the separated high-pressure saturated gas will rise to the top of the gas-liquid separator 3 and be discharged to the exhaust port 4 through the gas outlet of the gas-liquid separator 3.

[0030] With reference to Figure 1 The high-pressure saturated gas separated out by the gas-liquid separator 3 is unstable in nature, and under the condition of temperature reduction, the high-pressure saturated gas will separate out condensed water, and the condensed water will cause the gas conveying pipeline to be liquid, so the bypass pipeline 5 is arranged to solve the problem of separation of condensed water caused by temperature reduction. One end of the bypass pipeline 5 is communicated between the oil-injected screw compressor 1 and the gas cooler 2, the other end of the bypass pipeline 5 is communicated between the gas-liquid separator 3 and the exhaust port 4 and forms a mixing end 6, part of the high-temperature and high-pressure gas discharged from the oil-injected screw compressor 1 passes through the bypass pipeline 5, and the other part of the high-temperature and high-pressure gas is first cooled by the gas cooler 2 and then purified by the gas-liquid separator 3, and the two parts of high-pressure gas are mixed at the mixing end 6.

[0031] With reference to Figure 1 and Figure 2The control assembly 7 is arranged on the bypass pipeline 5, and is used for controlling the opening degree of the bypass pipeline 5. The control assembly 7 comprises an adjusting valve 8, a controller 9 and a temperature transmitter 10. The temperature transmitter 10 is arranged between the exhaust port 4 and the mixing end 6. The set temperature of the temperature transmitter 10 is 5-10 DEG C higher than the dew point of the gas pressure. The temperature transmitter 10 measures the actual temperature of the dew point of the gas pressure after mixing, converts the temperature signal into an electric signal, and sends the electric signal to the controller 9. The controller 9 is a programmable logic controller 9 of a PLC type, and can perform logic judgment, operation monitoring, data interaction and transmission. The controller 9 receives the signal from the temperature transmitter 10, compares and processes the actual temperature of the dew point of the gas pressure after mixing with the set temperature, determines the deviation between the set value and the actual value, calculates the control action to be performed according to the deviation, and connects the adjusting valve through the electric signal. The actuator of the adjusting valve 8 receives the signal from the controller 9, and automatically adjusts the opening degree of the valve disc of the adjusting valve 8 according to the signal, so as to control the flow of the high-temperature and high-pressure gas flowing to the bypass pipeline 5.

[0032] The implementation principle of the exhaust system of the oil-injected screw compressor in the embodiment of the application is as follows: low-pressure gas is compressed by the oil-injected screw compressor 1 to form high-temperature and high-pressure gas. A part of the high-temperature and high-pressure gas flows through the gas cooler 2 and the gas-liquid separator 3, and finally forms cooled high-pressure saturated gas. Another part of the high-temperature and high-pressure gas flows through the bypass pipeline 5. The actual temperature of the dew point of the gas pressure after mixing is measured by the temperature transmitter 10, the temperature signal is converted into an electric signal, and the electric signal is sent to the controller 9. After receiving the electric signal, the controller 9 controls the opening degree of the valve disc of the adjusting valve 8. The actuator of the adjusting valve 8 receives the signal from the controller 9 and automatically adjusts the opening degree of the valve disc according to the signal, so as to control the flow of the high-temperature and high-pressure gas flowing to the bypass pipeline 5. The two parts of gas are mixed at the mixing end 6. The high-temperature and high-pressure gas heats the cooled saturated gas, and forms high-pressure superheated gas. At this time, the gas is in a stable state and will not be affected by temperature reduction to separate condensed water.

[0033] Embodiment 2

[0034] Reference Figure 3The embodiment is different from the embodiment 1 in that a small amount of lubricating oil is contained in the high-pressure gas discharged from the oil-injected screw compressor 1, and therefore an oil-gas separator 11 is arranged between the gas outlet of the oil-injected screw compressor 1 and the gas inlet of the bypass pipeline 5 to effectively separate the high-pressure gas and the lubricating oil. The oil return pipeline 12 is arranged between the oil-gas separator 11 and the oil-injected screw compressor 1 to recycle the lubricating oil. The oil cooler 13 and the oil filter 14 are sequentially arranged in communication on the oil return pipeline 12, and the oil inlet of the oil cooler 13 is in communication with the oil outlet of the oil-gas separator 11. The lubricating oil separated from the oil-gas separator 11 flows to the oil return pipeline 12. Since the lubricating oil is too high in temperature to damage the oil return pipeline, the high-temperature and high-pressure gas is first discharged to the oil cooler 13 to reduce the temperature of the lubricating oil, and then the cooled lubricating oil flows to the oil filter 14. The oil filter 14 can filter the impurities and small particles in the lubricating oil to prevent the impurities in the lubricating oil from causing wear of the screw of the oil-injected screw compressor 1 during the operation of the oil-injected screw compressor 1. The oil return check valve 15 is further arranged on the oil return pipeline 12 and is arranged between the oil outlet of the oil filter 14 and the oil return port of the oil-injected screw compressor 1, so that the lubricating oil can only flow from the oil filter 14 to the oil inlet of the oil-injected screw compressor 1, preventing the lubricating oil of the oil-injected screw compressor 1 from flowing back to the oil filter 14 in the reverse direction, ensuring effective recycling and unidirectional flow of the lubricating oil, and improving the working efficiency of the oil-injected screw compressor 1.

[0035] The embodiment of the oil-injected screw compressor exhaust system provided in the application has the following implementation principle: The high-temperature and high-pressure gas discharged from the oil-injected screw compressor 1 is first discharged to the oil-gas separator 11 to separate the lubricating oil and the high-pressure gas, and then the separated lubricating oil flows to the oil return pipeline 12. On the oil return pipeline 12, the lubricating oil first flows to the oil cooler 13, then flows to the oil filter 14 after the temperature is reduced, and then flows out of the oil outlet of the oil filter 14 and passes through the oil return check valve 15 to finally flow into the oil return port of the oil-injected screw compressor 1, thereby realizing recycling of the lubricating oil.

[0036] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms "first", "second" or "third" and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. The terms "one", "another", "an" or "some" as well as similar referents in the context of describing the specification and claims are to be construed to be open-ended, i.e., to cover both singular and plural referents unless otherwise indicated. The terms "including", "containing" or "comprising" and the like are not intended to exclude other integers or steps, but to "include" or "comprise" other integers or steps unless otherwise indicated. The terms "connected", "coupled" or "pathway" and the like are not limited to direct connections, couplings or pathways, but can also include indirect connections, couplings or pathways unless otherwise indicated.

[0037] The above are only preferred embodiments of the present application, not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An oil-injected screw compressor exhaust system comprising, in sequence, an oil-injected screw compressor (1), a gas cooler (2), a gas-liquid separator (3), an exhaust port (4), characterised in that: The bypass pipeline (5) is connected at one end between the oil-injected screw compressor (1) and the gas cooler (2), and at the other end between the gas-liquid separator (3) and the exhaust port (4) and forms a mixed flow end (6), and the bypass pipeline (5) is further provided with a control assembly (7) for controlling the opening of the bypass pipeline (5).

2. An oil-injected screw compressor exhaust system according to claim 1, characterized in that: The control assembly (7) includes a regulating valve (8) arranged on the bypass pipeline (5), a controller (9) for controlling the opening of the regulating valve (8), and a temperature transmitter (10) arranged between the exhaust port (4) and the mixed flow end (6) for detecting the pressure dew point temperature of the mixed gas, the temperature transmitter (10) being signal connected with the controller (9), and the controller (9) receiving the signal of the temperature transmitter (10) to control the opening of the valve of the regulating valve (8).

3. An oil-injected screw compressor exhaust system according to claim 2, characterized in that: An oil-gas separator (11) is arranged between the gas outlet of the oil-injected screw compressor (1) and the gas inlet of the bypass pipeline (5), and an oil return pipeline (12) for recycling lubricating oil is arranged between the oil-gas separator (11) and the oil-injected screw compressor (1).

4. An oil-injected screw compressor exhaust system according to claim 3, characterized in that: The oil return pipeline (12) is sequentially provided with an oil cooler (13) for reducing the temperature of the lubricating oil, and an oil filter (14) for filtering impurities in the lubricating oil, and the oil inlet of the oil cooler (13) is communicated with the oil outlet of the oil-gas separator (11).

5. An oil-injected screw compressor exhaust system according to claim 4, characterised in that: An oil return check valve (15) is arranged between the oil filter (14) and the oil return port of the oil-injected screw compressor (1), and the oil return check valve (15) is arranged on the oil return pipeline (12) for controlling the one-way flow of the lubricating oil.

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