CN114922818A - Working condition control system applied to double-screw compressor - Google Patents

Abstract

The invention discloses a working condition control system applied to a double-screw compressor, which comprises a gas circuit module, an oil circuit module and a water replenishing module. The gas circuit module comprises a flash tank, a compressor and a gas storage tank, the flash tank, the compressor and the gas storage tank are sequentially communicated to form a passage, and the compressor is provided with a gas inlet and a gas outlet. The oil circuit module comprises an oil pump, and the oil pump is communicated with an oil inlet of the compressor to form a passage. The water replenishing module comprises a water replenishing pump and a water replenishing electromagnetic valve, and the water replenishing pump, the water replenishing electromagnetic valve and the air inlet of the compressor are communicated to form an access. The working condition control system applied to the double-screw compressor is particularly suitable for media with large adiabatic indexes, such as water vapor working media, process gases and the like. The working condition control system can actively control the working condition of the double-screw compressor by arranging the oil way module and the water supplementing module which can be actively controlled. Thereby ensuring the safety and stability of the working condition of the double-screw compressor. The working condition control system also has the advantages of simple structure, safety, reliability, wide application range and the like.

Description

Working condition control system applied to double-screw compressor

Technical Field

The invention relates to the technical field of gas compression, in particular to a working condition control system applied to a double-screw compressor.

Background

At present, the steam compressor is generally a twin-screw compressor, and the twin-screw compressor is mainly divided into an oil injection compressor and an oil-free compressor.

The oil injection type compressor generally injects lubricating oil in the compression process, and the lubricating oil plays roles of lubricating, cooling, sealing and noise reduction in the compression process. Therefore, in order to ensure the quality of the exhaust gas of the water vapor compressor, an oil-gas separation device is added in the exhaust system of the compressor to separate the injected lubricating oil, so that the compressed gas with extremely low oil content is discharged by the water vapor compressor. Such oil injected compressors typically do not have control over the amount of oil injected.

And the oil-free compressor does not spray lubricating oil in the compression process. Therefore, there is a need for additional lubrication, cooling, sealing and noise reduction systems in oil-less compressors. For example, in order to control the temperature of the compressor, a water jacket is usually formed on the outer shell of the rotor cavity of the compressor, and cooling water or cooling liquid is introduced from the outside to exchange heat with the rotor cavity at intervals to take away heat. Such oil-free compressors are generally complex in structure and large in volume. In addition, some oil-free compressors control the temperature of the compressor by reducing the volume ratio, and generally speaking, the volume ratio of the single-stage oil-free air compressor is only 1/3-1/2 of a single-stage oil-injection air compressor.

Therefore, a new technology is urgently needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a working condition control system applied to a double-screw compressor. The working condition control system applied to the double-screw compressor is particularly suitable for media with large adiabatic indexes, such as water vapor working media, process gas and the like. The working condition control system applied to the double-screw compressor can actively control the working condition of the double-screw compressor by arranging the oil way module and the water supplementing module which can be actively controlled. Thereby ensuring the safety and stability of the working condition of the double-screw compressor. In addition, the working condition control system applied to the double-screw compressor also has the advantages of simple and compact structure, good lubricating effect, wide application range and the like.

The invention provides the following technical scheme: a working condition control system applied to a double-screw compressor.

The working condition control system comprises a gas circuit module, an oil circuit module and a water supplementing module. The gas circuit module comprises a flash tank, a compressor and a gas storage tank, the flash tank, the compressor and the gas storage tank are sequentially communicated to form a passage, and the compressor is provided with a gas inlet and a gas inlet. The oil circuit module comprises an oil pump, and the oil pump is communicated with an oil inlet of the compressor to form a passage. The water replenishing module comprises a water replenishing pump and a water replenishing electromagnetic valve, and the water replenishing pump, the water replenishing electromagnetic valve and the air inlet of the compressor are communicated to form an access.

Preferably, the gas circuit module further comprises an intake air filter, the intake air filter is arranged between the flash tank and the compressor, and the flash tank, the intake air filter and the compressor are communicated in sequence.

Preferably, the gas circuit module further comprises a silencer, the silencer is arranged between the compressor and the gas storage tank, and the compressor, the silencer and the gas storage tank are sequentially communicated.

Preferably, the gas circuit module further comprises an exhaust one-way valve, the exhaust one-way valve is arranged between the compressor and the gas storage tank, and the compressor, the exhaust one-way valve and the gas storage tank are sequentially communicated.

Preferably, the oil circuit module further comprises a cooler, the cooler is arranged between the oil pump and the oil inlet of the compressor, and the oil pump, the cooler and the oil inlet of the compressor are sequentially communicated.

Preferably, the oil circuit module further includes a fan for cooling the cooler, the fan being disposed near the cooler.

Preferably, the oil circuit module further includes an oil filter, the oil filter is disposed between the oil pump and the oil inlet of the compressor, and the oil pump, the oil filter and the oil inlet of the compressor are sequentially communicated.

Preferably, the water replenishing module comprises an exhaust temperature detector for detecting the exhaust temperature of the compressor, and the exhaust temperature detector is arranged between the compressor and the steam storage tank and close to the compressor.

Preferably, the compressor is provided with an isolating gas inlet, a sealing element is arranged in the compressor, the sealing element comprises an isolating gas containing cavity, and the isolating gas containing cavity is communicated with the isolating gas inlet.

Preferably, a balance gas inlet is formed in the compressor, a sealing piece is arranged in the compressor and comprises a balance gas containing cavity, the balance gas containing cavity is communicated with the balance gas inlet, an exhaust port is formed in the compressor, and the balance gas inlet is communicated with the exhaust port.

The working condition control system applied to the double-screw compressor actively controls the working condition of the double-screw compressor by arranging the oil way module and the water replenishing module which can be actively controlled, and can lubricate by using lubricating oil, so that the lubricating effect is more stable and reliable, and the safety and the stability of the working condition of the double-screw compressor are ensured. Meanwhile, the working condition control system applied to the double-screw compressor does not need to be additionally provided with a large number of working condition auxiliary systems, and the structure of the whole system is more compact.

Drawings

FIG. 1 is a schematic structural diagram of an operating condition control system applied to a twin-screw compressor according to an embodiment of the present invention; and

fig. 2 is a schematic sectional view of the compressor in the embodiment shown in fig. 1.

The reference numerals and names in the figures are as follows:

100. a flash tank; 102. a compressor; 104. a steam storage tank; 106. an oil inlet; 108. an air inlet; 109. an exhaust port; 110. an intake air filter; 112. a muffler; 114. an exhaust check valve; 116. a flow meter; 118. a safety valve; 120. a bleed-off solenoid valve; 122: a motor; 123. a seal member; 124. an insulating gas receiving chamber; 125. an insulating gas inlet; 126. a balance gas accommodating chamber; 127. a balance gas inlet; 128. a rotor cavity; 130. an oil pump; 132. a cooler; 134. a fan; 136. an oil filter; 138. an oil tank; 150. a water replenishing pump; 152. a water replenishing electromagnetic valve; 154. a water replenishing regulating valve; 160. an isolated gas pipeline; 162. a balance gas pipeline; 164. a water discharge electromagnetic valve.

Detailed Description

Unless otherwise defined, technical or scientific terms used herein in the specification and claims should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

The embodiment of the application relates to a working condition control system applied to a double-screw compressor as shown in figures 1 and 2.

The working condition control system comprises a gas circuit module, an oil circuit module and a water supplementing module. The gas path module comprises a flash tank 100, a compressor 102 and a gas storage tank 104, the flash tank 100, the compressor 102 and the gas storage tank 104 are sequentially communicated to form a passage, and the compressor 102 is provided with an oil inlet 106 and an air inlet 108. The oil circuit module comprises an oil pump 130, and the oil pump 130 is communicated with the oil inlet 106 of the compressor 102 to form a passage. The water replenishing module comprises a water replenishing pump 150 and a water replenishing electromagnetic valve 152, and the water replenishing pump 150, the water replenishing electromagnetic valve 152 and the air inlet 108 of the compressor 102 are communicated to form a passage.

In some embodiments, the air path module further includes an intake air filter 110, the intake air filter 110 is disposed between the flash tank 100 and the compressor 102, and the flash tank 100, the intake air filter 110, and the compressor 102 are in communication in sequence.

In some embodiments, the gas circuit module further includes a silencer 112, the silencer 112 is disposed between the compressor 102 and the vapor storage tank 104, and the compressor 102, the silencer 112, and the vapor storage tank 104 are in serial communication.

In some embodiments, the air circuit module further includes a discharge check valve 114, the discharge check valve 114 is disposed between the compressor 102 and the steam storage tank 104, and the compressor 102, the discharge check valve 114 and the steam storage tank 104 are in serial communication.

In some embodiments, the gas circuit module further comprises a flow meter 116, the flow meter 116 is disposed between the exhaust check valve 114 and the steam storage tank 104, and the exhaust check valve 114, the flow meter 116 and the steam storage tank 104 are in communication in sequence.

In some embodiments, the air path module further includes a safety valve 118, the compressor 102 is provided with an air inlet 108 and an air outlet 109, an inlet of the safety valve 118 is communicated with the air outlet 109 of the compressor 102, and an outlet of the safety valve 118 is communicated with the air inlet 108 of the compressor 102.

In some embodiments, the air circuit module further includes a bleed solenoid valve 120, the compressor 102 is provided with an air inlet 108 and an air outlet 109, an inlet of the bleed solenoid valve 120 is connected to the air outlet 109 of the compressor 102, and an outlet of the bleed solenoid valve 120 is connected to the air inlet 108 of the compressor 102.

In the embodiment shown in fig. 1 and 2, the gas circuit module comprises a flash tank 100, an intake filter 110, a compressor 102, a silencer 112, a discharge check valve 114 and a gas storage tank 104 which are communicated in sequence. When the compressor 102 is driven by the motor 122 and started, the evaporated water vapor is sucked out of the flash tank 100, and then flows into the compressor 102 after being purified by the intake filter 110 to be compressed, thereby forming water vapor with high temperature and high pressure. The high-temperature and high-pressure water vapor flows out of the compressor 102 and enters the muffler 112. When the pressure of the high-temperature and high-pressure water vapor is higher than the pressure in the vapor storage tank 104, the exhaust check valve 114 opens, and the high-temperature and high-pressure water vapor flows into the vapor storage tank 104.

In some embodiments, the oil circuit module further includes a cooler 132, the cooler 132 is disposed between the oil pump 130 and the oil inlet 106 of the compressor 102, and the oil pump 130, the cooler 132 and the oil inlet 106 of the compressor 102 are sequentially communicated.

In some embodiments, the oil circuit module further includes a fan 134 for cooling the cooler 132, the fan 134 being disposed adjacent to the cooler 132.

In some embodiments, the oil circuit module further includes an oil filter 136, the oil filter 136 is disposed between the oil pump 130 and the oil inlet 106 of the compressor 102, and the oil pump 130, the oil filter 136 and the oil inlet 106 of the compressor 102 are sequentially communicated.

In the embodiment shown in fig. 1 and 2, the oil circuit module includes an oil pump 130, a cooler 132, and an oil filter 136, which are sequentially communicated, and a fan 134 disposed near the cooler 132. The oil pump 130 draws oil from an oil reservoir 138, which is cooled by passing through the cooler 132, filtered by passing through an oil filter 136, and flows into the compressor 102 through the oil inlet 106 of the compressor 102. The lubricating oil can be used to lubricate and cool bearings and gears in the compressor 102. If further cooling of the oil is desired, fan 134 may be turned on to provide air to cooler 132 to further cool the oil.

In some embodiments, the water replenishment module includes an exhaust temperature detector for detecting the temperature of the exhaust gas from the compressor 102, the exhaust temperature detector being disposed between the compressor 102 and the vapor storage tank 104 proximate to the compressor 102.

In some embodiments, the water replenishing module further includes a water replenishing regulating valve 154, the water replenishing regulating valve 154 is disposed between the water replenishing solenoid valve 152 and the air inlet 108 of the compressor 102, and the water replenishing pump 150, the water replenishing solenoid valve 152, the water replenishing regulating valve 154 and the air inlet 108 of the compressor 102 are communicated to form a passage.

In the embodiment shown in fig. 1 and 2, the water replenishing module includes a water replenishing pump 150, a water replenishing solenoid valve 152, and an exhaust temperature detector. When the compressor 102 is running, the make-up water pump 150 is turned on. The discharge temperature detector detects the discharge temperature of the compressor 102. When the discharge temperature is higher than or equal to the set value, the water replenishment solenoid valve 152 is opened and liquid water is introduced to cool the compressor 102. When the exhaust temperature is lower than the set value, the water replenishment solenoid valve 152 is closed.

In some embodiments, a shielding gas inlet 125 is disposed on the compressor 102, a sealing member 123 is disposed in the compressor 102, and the sealing member 123 includes a shielding gas accommodating cavity 124, and the shielding gas accommodating cavity 124 is communicated with the shielding gas inlet 125. The barrier gas inlet 125 may be connected to a barrier gas pipe 160 to introduce external barrier gas. The barrier gas inlet 125 can be used to introduce barrier gas into the barrier gas receiving chamber 124 of the sealing element 123, in order to improve the sealing effect of the sealing element 123 of the compressor 102. The barrier gas may be dry air.

In some embodiments, a balance gas inlet 127 is disposed on the compressor 102, a sealing member 123 is disposed in the compressor 102, the sealing member 123 includes a balance gas receiving cavity 126, the balance gas receiving cavity 126 is in communication with the balance gas inlet 127, a discharge outlet 109 is disposed on the compressor 102, and the balance gas inlet 127 is in communication with the discharge outlet 109. The balance gas receiving chamber 126 may be disposed at a location where the seal 123 is adjacent to the rotor chamber 128. The balance gas inlet 127 and the exhaust 109 may be connected by a balance gas conduit 162. When the suction side or discharge side pressure of the compressor 102 is below atmospheric pressure, atmospheric air may leak into the rotor cavity 128 of the compressor 102. In the embodiment shown in fig. 1 and 2, to avoid atmospheric leakage, the seal 123 may be filled with a balance gas at a location adjacent to the rotor cavity 128. The balance gas is a high-temperature and high-pressure vapor generated by the compressor 102, and therefore, the pressure of the balance gas is higher than the atmospheric pressure, which can effectively prevent the atmospheric air from leaking into the rotor cavity 128.

In some embodiments, the condition control system includes a bleed solenoid valve 164, and the exhaust port 109 of the compressor 102 is in communication with the bleed solenoid valve 164. Drain valve 164 may be used to vent air from the climate control system, particularly during initial start-up periods of operation of compressor 102.

An embodiment of the application of the working condition control system applied to the double-screw compressor in water vapor compression is given. The same parts in this embodiment as in the above-described embodiment shown in fig. 1 and 2 will not be described again.

In this embodiment, the operating condition control system includes an air path module, an oil path module, and a water replenishment module. The gas circuit module comprises a flash tank, an air inlet filter, a compressor, a silencer, an exhaust one-way valve and a gas storage tank which are sequentially communicated. When the compressor is driven by the motor and started, the evaporated water vapor is sucked out from the flash tank. The water temperature in the flash tank may be 85 c, the temperature of the evaporated water vapour flashed off may be 80 c, and the corresponding saturated vapour pressure may be 0.047mpa (a). The evaporated water vapor is then purified by the inlet filter and flows into the compressor, at which point the entire pipeline is at a negative pressure. The compressor compresses the evaporated water vapor and forms high-temperature and high-pressure water vapor. The pressure value of the high-temperature and high-pressure water vapor can be 0.198MPa (A), and the temperature can be 120 ℃. The high-temperature and high-pressure water vapor flows out of the compressor and then enters the silencer. When the pressure of the high-temperature high-pressure water vapor is higher than the pressure in the vapor storage tank, the exhaust check valve is opened, and the high-temperature high-pressure water vapor flows into the vapor storage tank. The system pipeline can be sealed by adopting a mode that a flange is matched with a gasket for use.

The compressor may include a compression chamber in the middle and a bearing chamber at both ends, and the compressor may further include a seal between the compression chamber and the bearing chamber, respectively. The seal may be a dynamic seal assembly. The sealing element can be provided with a balance gas containing cavity close to the compression cavity and an isolation gas containing cavity close to the bearing cavity.

The isolation gas containing cavity can be filled with dry air as isolation gas, and the amount of the dry air is generally not more than 10Nm ³ The pressure of the drying air is slightly higher than the discharge pressure of the compressor and may be 0.22MPa (A). The chamber is held through setting up the isolation gas, can completely cut off the compression chamber and the bearing chamber of compressor.

The balance gas containing cavity can be filled with balance gas for preventing the air in the isolating gas containing cavity from leaking to the compression cavity of the compressor. The balance gas can be high-temperature high-pressure steam produced by a compressor, and the pressure value can be 0.198MPa (A). The balance gas can be used for isolating the compression cavity of the compressor from the dry air, and ensuring the purity of the steam.

Here, an example of the application of the working condition control system applied to the double-screw compressor in coal bed gas compression is given again. The same parts in this embodiment as in the above embodiment will not be described again.

The main component of the coal bed gas is CH ₄ . The general inlet air temperature of the compressor is normal temperature-10 ℃ to 45 ℃, and the inlet air pressure is micro positive pressure 0.12MPa (A). The typical discharge pressure of the compressor is 0.9MPa (A) and the discharge temperature is 80 ℃. The compressor may include a compression chamber in the middle and bearing chambers at both ends, and the compressor may further include a compression chamber and a bearing chamber at the compression chamber and the bearing chambers, respectivelyA seal therebetween. The seal may be a dynamic seal assembly. The seal may be provided with only a separate gas receiving chamber located adjacent the bearing chamber. The isolation gas containing cavity can be filled with dry air as isolation gas, and the amount of the dry air is generally not more than 15Nm ³ The pressure of the drying air is higher than the discharge pressure of the compressor and may be 1MPa (A). The cavity is accommodated by the isolating gas, so that the compression cavity and the bearing cavity of the compressor can be isolated.

In addition, in the embodiment, a certain amount of water needs to be sprayed into the compressor through the water replenishing module in the compression process, and the amount of the water can be about 1-1.5% of the displacement of the compressor. The water cools the compression process and also eliminates sparks that may occur from dry friction encountered by rotating components of the compressor.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. A working condition control system applied to a double-screw compressor comprises a gas circuit module, an oil circuit module and a water replenishing module; the gas circuit module comprises a flash tank, a compressor and a gas storage tank, wherein the flash tank, the compressor and the gas storage tank are sequentially communicated to form a passage, and the compressor is provided with an oil inlet and an air inlet; the oil circuit module comprises an oil pump, and the oil pump is communicated with an oil inlet of the compressor to form a passage; the water replenishing module comprises a water replenishing pump and a water replenishing electromagnetic valve, and the water replenishing pump, the water replenishing electromagnetic valve and the air inlet of the compressor are communicated to form a passage.

2. The operating condition control system applied to the double-screw compressor as claimed in claim 1, wherein the gas circuit module further comprises a gas inlet filter, the gas inlet filter is arranged between the flash tank and the compressor, and the flash tank, the gas inlet filter and the compressor are communicated in sequence.

3. The operating condition control system applied to the double-screw compressor as claimed in claim 1, wherein the gas circuit module further comprises a silencer, the silencer is arranged between the compressor and the gas storage tank, and the compressor, the silencer and the gas storage tank are sequentially communicated.

4. The operating condition control system applied to the double-screw compressor as claimed in claim 1, wherein the gas circuit module further comprises a gas discharge one-way valve, the gas discharge one-way valve is arranged between the compressor and the gas storage tank, and the compressor, the gas discharge one-way valve and the gas storage tank are sequentially communicated.

5. The operating condition control system applied to the double-screw compressor as claimed in claim 1, wherein the oil circuit module further comprises a cooler, the cooler is arranged between the oil pump and an oil inlet of the compressor, and the oil pump, the cooler and the oil inlet of the compressor are sequentially communicated.

6. The duty control system applied to the twin-screw compressor according to claim 5, wherein said oil circuit module further comprises a fan for cooling said cooler, said fan being disposed near said cooler.

7. The operating condition control system applied to the double-screw compressor as claimed in claim 1, wherein the oil circuit module further comprises an oil filter, the oil filter is arranged between the oil pump and an oil inlet of the compressor, and the oil pump, the oil filter and the oil inlet of the compressor are sequentially communicated.

8. The operating condition control system applied to the double-screw compressor as claimed in claim 1, wherein the water supplementing module comprises a discharge temperature detector for detecting the discharge temperature of the compressor, and the discharge temperature detector is arranged between the compressor and the steam storage tank and close to the compressor.

9. The operating condition control system applied to the double-screw compressor as claimed in claim 1, wherein an isolating gas inlet is arranged on the compressor, a sealing element is arranged in the compressor, the sealing element comprises an isolating gas accommodating cavity, and the isolating gas accommodating cavity is communicated with the isolating gas inlet.

10. The operating condition control system applied to the double-screw compressor, as recited in claim 1, wherein a balance gas inlet is provided on said compressor, a sealing member is provided in said compressor, said sealing member includes a balance gas receiving chamber, said balance gas receiving chamber is in communication with said balance gas inlet, said compressor is provided with a gas discharge port, and said balance gas inlet is in communication with said gas discharge port.

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