Water spraying two-stage single-screw compressor

Abstract

The utility model discloses a water spraying two-stage single-screw compressor which comprises a motor, a first-stage main machine, a second-stage main machine, a water-gas separator and a cooler, the motor is connected with the first-stage main machine, the first-stage main machine is connected with the second-stage main machine, a cooling liquid outlet of the water-gas separator is connected with the cooler, and a cooling liquid outlet of the water-gas separator is connected with the second-stage main machine. A cold liquid outlet of the cooler is connected with a liquid spraying pipeline, a water filter is arranged on the liquid spraying pipeline, the tail end of the liquid spraying pipeline is divided into two paths, one path is a first-stage water pipe, the other path is a second-stage water pipe, the first-stage water pipe is connected with a water inlet of the first-stage main machine, a first-stage control valve is arranged on the first-stage water pipe, and a second-stage control valve is arranged on the second-stage water pipe. The second-stage water pipe is connected with a water inlet of the second-stage main machine, and a second-stage control valve is arranged on the second-stage water pipe. The utility model has the advantages of simple structure, high reliability and reduced cost, ensures that the primary host cannot be damaged quickly, and avoids vibration and abnormal sound caused by instantaneous increase of internal and external pressure of the host.

Description

Technical Field

[0001] The utility model relates to the technical field of water jet compressors, in particular to a water jet two-stage single screw compressor. Background Art

[0002] Existing products often adopt double motors, double main engines, and double water-gas separators, with each water-gas bucket supplying water to the corresponding main engine, resulting in a complex structure. Additionally, for existing single-machine products, after a total solenoid valve, water is supplied to the first-stage main engine and the second-stage main engine through two branches. There are problems such as a relatively large selection of the total solenoid valve, and the two branches are prone to causing the secondary gas to flow back into the first-stage water spray pipe from the water path, resulting in high exhaust temperature of the first-stage heavy-pressure gas or high exhaust temperature due to water shortage in the second stage; when a single total solenoid valve is damaged, both the first-stage main engine and the second-stage main engine lack water simultaneously, posing a risk of damage to both compressors. Moreover, existing products often use a natural pressure air supply channel when unloading, that is, when the intake valve is closed. In this case, the air supply channel needs to be too large or the air supply is insufficient. In a short period of unloading, the vacuum degree inside the main engine is high, and at this time, the pressure inside the water-gas separator is relatively high, which leads to a large instantaneous increase in the internal and external pressure ratio of the main engine, thereby generating vibration and abnormal noise. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, and provide a water jet two-stage single screw compressor with a simple structure, which can ensure that the first-stage main engine will not be damaged rapidly, avoid the instantaneous increase in the internal and external pressure of the main engine to generate vibration and abnormal noise, can reduce costs, and has high reliability.

[0004] The utility model is realized through the following technical solutions: A water jet two-stage single screw compressor includes a motor, a first-stage main engine, a second-stage main engine, a water-gas separator, and a cooler. The motor is connected to the first-stage main engine, the first-stage main engine is connected to the second-stage main engine, the coolant outlet of the water-gas separator is connected to the cooler, a liquid spray pipe is connected to the cold liquid outlet of the cooler, a water filter is arranged on the liquid spray pipe, the end of the liquid spray pipe is divided into two paths, one path is a first-stage water pipe, and the other path is a second-stage water pipe. The first-stage water pipe is connected to the water inlet of the first-stage main engine, and a first-stage control valve is arranged on the first-stage water pipe. The second-stage water pipe is connected to the water inlet of the second-stage main engine, and a second-stage control valve is arranged on the second-stage water pipe.

[0005] Furthermore: A small water pipe is connected between the first-stage water pipe and the second-stage water pipe, and both ends of the small water pipe are located behind the first-stage control valve and behind the second-stage control valve.

[0006] Further: The air outlet of the water-air separator is connected to a guide pipe through an unloading shutdown venting channel. The guide pipe is respectively connected to an air filter and an unloading valve. The unloading valve is connected to the air inlet end of the first-stage main machine. An unloading venting solenoid valve and an unloading pressure-maintaining adjustment hole are provided on the unloading shutdown venting channel. A main machine unloading air supplement channel is connected between the unloading shutdown venting channel and the air inlet end of the first-stage main machine, and the end of the main machine unloading air supplement channel connected to the unloading shutdown venting channel is located between the rear end of the unloading venting solenoid valve and the front end of the unloading pressure-maintaining adjustment hole.

[0007] Further: The first-stage control valve and the second-stage control valve are respectively solenoid valves.

[0008] Further: A natural pressure air supplement pipeline is connected between the guide pipe and the air inlet end of the first-stage main machine, and an intake throttle hole is provided on the natural pressure air supplement pipeline.

[0009] Further: The cooler is an air-cooled cooler or a water-cooled cooler.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] In the utility model, the first-stage water pipe is connected to the water inlet of the first-stage main machine, and a first-stage control valve is provided on the first-stage water pipe. The second-stage water pipe is connected to the water inlet of the second-stage main machine, and a second-stage control valve is provided on the second-stage water pipe. Both the first-stage control valve and the second-stage control valve are located at the rear end of the water filter. Thus, independent water supply control valves and independent water supply pipelines are adopted for each main machine, effectively improving the reliability of the control valves, avoiding the possibility that the high-pressure gas of the second-stage main machine flows back from the water circuit to the first-stage main machine, resulting in the inability to supply water to the second-stage main machine. Moreover, the first-stage control valve and the second-stage control valve share the same water filter, which can reduce costs. A small water pipe is led out at the rear end of the second-stage control valve to connect with the rear end of the first-stage control valve. If the first-stage control valve is damaged, a small amount of water can be supplemented through the small water pipe to ensure that the first-stage main machine will not be damaged rapidly. On the unloading shutdown venting channel, a main machine unloading air supplement channel is provided between the rear end of the unloading venting solenoid valve and the front end of the unloading pressure-maintaining adjustment hole. During unloading, compressed gas on the venting return path is introduced into the main machine to supplement the main machine, so as to prevent the vacuum degree in the main machine from being too high during unloading, resulting in a high pressure ratio at this time, causing abnormal noise and vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural schematic diagram of the utility model.

[0013] Description of reference numerals: 1 - motor, 2 - primary main unit, 3 - secondary main unit, 4 - water-air separator, 5 - cooler, 6 - liquid injection pipeline, 7 - water filter, 8 - primary water pipe, 9 - secondary water pipe, 10 - primary control valve, 11 - secondary control valve, 12 - small water pipe, 13 - unloading shutdown venting channel, 14 - air duct, 15 - air filter, 16 - unloading valve, 17 - unloading venting solenoid valve, 18 - unloading pressure maintaining adjustment hole, 19 - main unit unloading air supplementing channel, 20 - natural pressure air supplementing pipeline, 21 - intake throttle hole. Detailed implementation manners

[0014] Figure 1 The following is a schematic structural diagram of an embodiment of a water-injected two-stage single-screw compressor provided by the present utility model, which includes a motor 1, a primary main unit 2, a secondary main unit 3, a water-air separator 4, and a cooler 5. The motor 1 is connected to the primary main unit 2, the primary main unit 2 is connected to the secondary main unit 3, the coolant outlet of the water-air separator 4 is connected to the cooler 5, a liquid injection pipeline 6 is connected to the cold liquid outlet of the cooler 5, a water filter 7 is arranged on the liquid injection pipeline 6, the end of the liquid injection pipeline 6 is divided into two paths, one path is a primary water pipe 8, and the other path is a secondary water pipe 9. The primary water pipe 8 is connected to the water inlet of the primary main unit 2, and a primary control valve 10 is arranged on the primary water pipe 8. The secondary water pipe 9 is connected to the water inlet of the secondary main unit 3, and a secondary control valve 11 is arranged on the secondary water pipe 9.

[0015] The primary control valve 10 and the secondary control valve 11 are respectively solenoid valves.

[0016] The cooler 5 is an air-cooled cooler or a water-cooled cooler.

[0017] By dividing the end of the liquid injection pipeline 6 into two water supply paths, namely the primary water pipe 8 and the secondary water pipe 9, the primary water pipe 8 controls water supply or water cut-off through the primary control valve 10, and the secondary water pipe 9 controls water supply or water cut-off through the secondary control valve 11, so that the primary main unit 2 and the secondary main unit 3 respectively adopt independent control valves, instead of the existing structure of using a common main solenoid valve and then dividing into two water supply paths to the primary main unit 2 and the secondary main unit 3. The present utility model adopts double control valves, which can effectively improve the reliability of the control valves, prevent problems with the main solenoid valve, causing both main units to be simultaneously overheated or burned out, and at the same time avoid the possibility that the high-pressure gas of the secondary main unit 3 flows back from the water path to the primary main unit 2, resulting in the inability to supply water to the secondary main unit 3. The primary control valve 10 and the secondary control valve 11 are installed at the rear end of the water filter 7, so that the primary control valve 10 and the secondary control valve 11 share the same filter, and two small control valves can be used to replace one large main solenoid valve, reducing costs and having high reliability.

[0018] A small water pipe 12 is connected between the primary water pipe 8 and the secondary water pipe 9, and both ends of the small water pipe 12 are located at the rear end of the primary control valve 10 and the rear end of the secondary control valve 11.

[0019] A small water pipe 12 is led from the rear end of the secondary control valve 11 to connect with the rear end of the primary control valve 10, preventing the primary host 2 from suffering from an emergency water shortage after the primary control valve 10 is damaged. On the premise that the small water pipe 12 can prevent the reverse flow of gas, it can also ensure that after the primary control valve 10 is damaged, a small amount of water can be provided to the primary host 2 so that the primary host 2 will not rapidly heat up, avoiding the possibility of the primary host 2 being damaged all at once, leaving time for the temperature sensor to detect high temperature and keep the intake shut down. If the secondary control valve 11 is damaged and the primary control valve 10 is normal, the exhaust gas of the primary host 2 contains water, and the water-gas mixture enters the secondary host 3, which can ensure that the secondary host 3 has water lubrication and will not cause rapid damage to the secondary host 3.

[0020] The air outlet of the water-gas separator 4 is connected to the air guide pipe 14 through the unloading shutdown venting channel 13. The air guide pipe 14 is respectively connected to the air filter 15 and the unloading valve 16. The unloading valve 16 is connected to the intake end of the primary host 2. An unloading venting solenoid valve 17 and an unloading pressure maintaining adjustment hole 18 are arranged on the unloading shutdown venting channel 13. A main engine unloading air supplement channel 19 is connected between the unloading shutdown venting channel 13 and the intake end of the primary host 2, and the end of the main engine unloading air supplement channel 19 connected to the unloading shutdown venting channel 13 is located between the rear end of the unloading venting solenoid valve 17 and the front end of the unloading pressure maintaining adjustment hole 18.

[0021] A natural pressure air supplement pipeline 20 is connected between the air guide pipe 14 and the intake end of the primary host 2, and an intake throttle hole 21 is arranged on the natural pressure air supplement pipeline 20.

[0022] The main engine unloading air supplement channel 19 is arranged in the unloading shutdown venting channel 13 and is located between the rear end of the unloading venting solenoid valve 17 and the front end of the unloading pressure maintaining adjustment hole 18. A path of compressed gas is led back to the main engine through the main engine unloading air supplement channel 19. During unloading, the circuit of the unloading venting solenoid valve 17 is open, and the compressed gas in the water-gas separator 4 is vented through the unloading shutdown venting channel 13 to the air guide pipe 14, and passes through the unloading pressure maintaining adjustment hole 18. The unloading pressure maintaining adjustment hole 18 adjusts and controls the lowest pressure of the water-gas separator 4 to ensure the pressure required for the water in the water-gas separator 4 to circulate in the system. At this time, the compressed gas enters the main engine from the main engine unloading air supplement channel 19, preventing the vacuum degree in the main engine from being too high when the unloading valve 16 is closed, which may cause abnormal noise in the main engine during unloading. When the compressor is in the loading state, that is, the unloading venting solenoid valve 17 is closed and there is no compressed gas in the unloading shutdown venting channel 13, and the unloading valve 16 is opened. At this time, the main engine unloading air supplement channel 19 does not work. Setting the main engine unloading air supplement channel 19 at this position can share existing parts without adding extra parts. In addition, the pressure in the main engine after shutdown can be released back to the front of the valve through this path, ensuring that the pressure in the main engine can be completely released during shutdown and the compressor can be started lightly the next time it restarts.

[0023] The above detailed description is a specific description of the feasible embodiments of the present utility model. These embodiments are not intended to limit the patent scope of the present utility model. Any equivalent implementation or modification made without departing from the present utility model shall be included in the patent scope of this case.

Claims

1. A water spray two-stage single screw compressor, comprising a motor, a first-stage main unit, a second-stage main unit, a water-gas separator, and a cooler. The motor is connected to the first-stage main unit, the first-stage main unit is connected to the second-stage main unit, the coolant outlet of the water-gas separator is connected to the cooler, and a liquid spraying pipeline is connected to the cold liquid outlet of the cooler. It is characterized in that: A water filter is provided on the liquid spraying pipeline. The end of the liquid spraying pipeline is divided into two paths. One path is a primary water pipe, and the other path is a secondary water pipe. The primary water pipe is connected to the water inlet of the primary main machine, and a primary control valve is provided on the primary water pipe. The secondary water pipe is connected to the water inlet of the secondary main machine, and a secondary control valve is provided on the secondary water pipe.

2. The water spray two-stage single screw compressor according to claim 1, characterized in that: A small water pipe is connected between the primary water pipe and the secondary water pipe. The two ends of the small water pipe are located at the rear ends of the primary control valve and the secondary control valve.

3. The water injection two-stage single screw compressor according to claim 2, wherein: The air outlet of the air-water separator is connected to a gas guide pipe through an unloading and shutdown venting channel. The gas guide pipe is respectively connected to an air filter and a relief valve. The relief valve is connected to the air inlet end of the primary main machine. An unloading venting solenoid valve and an unloading pressure maintaining adjustment hole are provided on the unloading and shutdown venting channel. A main machine unloading air supplementing channel is connected between the unloading and shutdown venting channel and the air inlet end of the primary main machine. And the end of the main machine unloading air supplementing channel connected to the unloading and shutdown venting channel is located between the rear end of the unloading venting solenoid valve and the front end of the unloading pressure maintaining adjustment hole.

4. The water injection two-stage single screw compressor according to claim 2, wherein: The primary control valve and the secondary control valve are respectively solenoid valves.

5. The water injection two-stage single screw compressor according to claim 3, wherein: A natural pressure air supplementing pipeline is connected between the gas guide pipe and the air inlet end of the primary main machine. An air inlet throttle hole is provided on the natural pressure air supplementing pipeline.

6. The water injection two-stage single screw compressor according to claim 3, wherein: The cooler is an air-cooled cooler or a water-cooled cooler.

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