Three-stage series control Roots blower unit

Abstract

The utility model provides a three-stage series control Roots blower set which is provided with a first blower, a second blower and a third blower, and the first blower, the second blower and the third blower are respectively provided with a first driving motor, a second driving motor and a third driving motor. The Roots blower solves the problems that an existing Roots blower adopting a single-stage or double-stage series structure is difficult to be suitable for large-pressure transmission places due to limited transmission pressure, and the Roots blower adopting the single-stage or double-stage series structure is not provided with a no-load start-stop structure, so that the Roots blower is not suitable for large-pressure transmission places when the Roots blower is started and shut down. And large load pressure needs to be borne. The Roots blower can be widely applied to Roots blowers.

Description

Technical Field

[0001] The utility model relates to a Roots blower, in particular to a three-stage series-controlled Roots blower unit. Background Art

[0002] Currently, most Roots blowers adopt a single-stage or double-stage series structure. However, due to the limited transmission pressure, the single-stage or double-stage series structure is difficult to apply to high-pressure transmission places. In addition, since the single-stage or double-stage series structure Roots blower does not have a no-load start-stop structure, the Roots blower needs to withstand a large load pressure when turning the blower on and off, which leads to a significant increase in the failure rate of the blower and a significant reduction in the service life of the blower. Utility Model Content

[0003] In view of the above technical problems, the utility model provides a three-stage series-controlled Roots blower unit. The three-stage series-controlled Roots blower unit adopts three groups of Roots blowers to operate in series, so the transmission pressure is significantly improved, and can be easily applied to high-pressure transmission places. The transmission pressure can reach 200-300kPa. In addition, by adopting a no-load start-stop structure design, the Roots blower does not need to bear a large load pressure when the Roots blower is turned on and off, so the failure rate of the blower is significantly reduced and the service life is significantly increased.

[0004] To this end, the technical solution of the utility model is a three-stage series-controlled Roots blower unit, which is provided with a first blower, a second blower and a third blower, and the first blower, the second blower and the third blower are respectively provided with a first drive motor, a second drive motor and a third drive motor;

[0005] The air inlet of the first blower is connected to a four-way joint, and the four-way joint is provided with a first interface, a second interface, a third interface and a fourth interface, the air inlet of the first blower is in communication with the first interface, the second interface is connected to a first valve, the third interface is connected to a second valve, the other end of the second valve is connected to a three-way joint, and the three-way joint is provided with a fifth interface, a sixth interface and a seventh interface, the second valve is in communication with the fifth interface, the sixth interface is in communication with the air outlet of the first blower, the fourth interface is connected to the three-way joint, and is in communication with the sixth interface on the three-way joint, the fifth interface on the three-way joint is connected to a first check valve, and is in communication with the air inlet of the first check valve, the air outlet of the first check valve is connected to a three-way joint, and is in communication with the sixth interface on the three-way joint, and the fifth interface on the three-way joint is in communication with the seventh interface on the three-way joint on one side of the second valve;

[0006] The seventh interface on the three-way joint on the air inlet side of the first check valve is connected to the fourth valve, the other end of the fourth valve is connected to the three-way joint, the fourth valve is connected to the fifth interface on the three-way joint, the sixth interface on the three-way joint is connected to the sixth check valve, the sixth interface on the three-way joint is connected to the air inlet of the sixth check valve, and the air outlet of the sixth check valve is connected to the fifth valve;

[0007] The seventh interface on the three-way joint on the air outlet side of the first check valve is connected to the second check valve, and is communicated with the air inlet of the second check valve. The air outlet of the second check valve is connected to a four-way joint, and is communicated with the second interface on the four-way joint. The first interface on the four-way joint is connected to the second blower, and is communicated with the air inlet of the second blower. The fourth interface on the four-way joint is connected to the third check valve, and is communicated with the air outlet of the third check valve. The air inlet of the third check valve is connected to the third valve. The third interface on the four-way joint is connected to the fourth check valve, and is communicated with the air inlet of the fourth check valve. The air outlet of the valve is connected to a three-way joint, which is connected to the sixth interface on the three-way joint, the fifth interface on the three-way joint is connected to the air outlet of the second blower, the seventh interface on the three-way joint is connected to the third blower and the fifth check valve respectively, and is connected to the air inlet of the third blower and the air inlet of the fifth check valve respectively, the air outlet of the fifth check valve is connected to a three-way joint, which is connected to the fifth interface on the three-way joint, the seventh interface on the three-way joint is connected to the air outlet of the third blower, and the sixth interface on the three-way joint is connected to the seventh interface on the three-way joint on the air inlet side of the sixth check valve.

[0008] Preferably, a first temperature transmitter and a first pressure transmitter are connected in sequence between the air inlet of the first blower and the first valve;

[0009] A second temperature transmitter is connected between the seventh interface on the three-way joint on the gas outlet side of the first check valve and the second check valve;

[0010] A second pressure transmitter is connected between a first interface on a four-way joint on one side of an air outlet of the third check valve and an air inlet of the second blower;

[0011] A third temperature transmitter and a third pressure transmitter are connected in sequence between a fifth interface on the three-way joint on the air inlet side of the fifth check valve and an air inlet of the third blower;

[0012] A fourth temperature transmitter and a fourth pressure transmitter are connected in sequence between a sixth interface on the three-way connector on the air outlet side of the fifth check valve and a seventh interface on the three-way connector on the air inlet side of the sixth check valve.

[0013] Preferably, a first cooler is connected between the air outlet of the first blower and the sixth interface on the three-way connector on one side of the second valve;

[0014] A second cooler is connected between the air outlet of the second blower and the fifth interface on the three-way joint on one side of the fourth check valve;

[0015] A third cooler is connected between the air outlet of the third blower and the seventh interface on the three-way joint on one side of the air outlet of the fifth check valve.

[0016] Preferably, a three-way joint is connected between the fourth temperature transmitter and the fourth pressure transmitter, the fourth temperature transmitter and the fourth pressure transmitter are respectively connected to the sixth interface and the seventh interface on the three-way joint, the fifth interface on the three-way joint is connected to a pressure relief valve, and the other end of the pressure relief valve is connected to the seventh interface on the three-way joint on the air inlet side of the first check valve.

[0017] The beneficial effects of the utility model are:

[0018] 1. The three-stage series-controlled Roots blower unit uses three groups of Roots blowers running in series, and the transmission pressure is significantly improved. It can be easily applied to places with high pressure transmission. The transmission pressure can reach 200-300kPa. In addition, by installing multiple valves at designated positions in the pipeline, the blower can be turned on and off without load, ensuring that the blower does not need to bear a large load pressure when it is turned on and off. The failure rate of the blower is significantly reduced and the service life is significantly increased.

[0019] 2. By installing coolers at the air outlets of the first blower, the second blower and the third blower respectively, the gas at the air outlet of the blower can be cooled down immediately to avoid excessively high temperature of the transmitted gas, which affects the normal operation of the load equipment. At the same time, it can avoid the problem of accelerated aging of the connecting pipelines due to excessively high temperature of the transmitted gas, thereby further ensuring the overall service life of the gas transmission equipment.

[0020] 3. By installing temperature transmitters and pressure transmitters in the connecting pipelines, the temperature of the transmitted gas and the gas pressure in the pipeline can be monitored in real time. When the temperature or pressure is too high, it can be discovered and repaired in the first time to avoid related safety hazards.

[0021] 4. Install a pressure relief valve in the connecting pipeline. When the pressure in the pipeline is too high and not discovered in time, the pressure relief valve can release the pressure immediately to avoid safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the operation logic flow chart of the utility model;

[0023] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This utility model Figure 1 Enlarged view of point B in the middle;

[0025] Figure 4 This utility model Figure 1 Enlarged view of center C.

[0026] Explanation of symbols in the figure:

[0027] 1. First drive motor; 2. Second drive motor; 3. Third drive motor; 4. First blower; 5. Second blower; 6. Third blower; 7. First cooler; 8. Second cooler; 9. Third cooler; 10. First valve; 11. Second valve; 12. Third valve; 13. Fourth valve; 14. Fifth valve; 15. First check valve; 16. Second check valve; 17. Third check valve; 18. Fourth check valve; 19. Fifth check valve; 20. Sixth check valve; 21. First temperature 1. first pressure transmitter; 22. first pressure transmitter; 23. second temperature transmitter; 24. second pressure transmitter; 25. third temperature transmitter; 26. third pressure transmitter; 27. pressure relief valve; 28. fourth temperature transmitter; 29. ​​fourth pressure transmitter; 31. four-way connector; 3101. first interface; 3102. second interface; 3103. third interface; 3104. fourth interface; 32. three-way connector; 3201. fifth interface; 3202. sixth interface; 3203. seventh interface. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with embodiments.

[0029] pass Figure 1-Figure 4 It can be seen that the three-stage series-controlled Roots blower unit is provided with a first blower 4, a second blower 5 and a third blower 6, and the first blower 4, the second blower 5 and the third blower 6 are respectively provided with a first drive motor 1, a second drive motor 2 and a third drive motor 3.

[0030] The air inlet of the first blower 4 is connected to a four-way joint 31, on which a first interface 3101, a second interface 3102, a third interface 3103 and a fourth interface 3104 are provided. The air inlet of the first blower 4 is in communication with the first interface 3101, the second interface 3102 is connected to a first valve 10, the third interface 3103 is connected to a second valve 11, the other end of the second valve 11 is connected to a three-way joint 32, on which a fifth interface 3201, a sixth interface 3202 and a seventh interface 3203 are provided, and the second valve 11 and the fifth interface 320 1, the sixth interface 3202 is connected to the air outlet of the first blower 4, the fourth interface 3104 is connected to the three-way joint 32, and is connected to the sixth interface 3202 on the three-way joint 32, the fifth interface 3201 on the three-way joint 32 is connected to the first check valve 15, and is connected to the air inlet of the first check valve 15, the air outlet of the first check valve 15 is connected to the three-way joint 32, and is connected to the sixth interface 3202 on the three-way joint 32, and the fifth interface 3201 on the three-way joint 32 is connected to the seventh interface 3203 on the three-way joint 32 on one side of the second valve 11.

[0031] The seventh interface 3203 on the three-way joint 32 on the air inlet side of the first check valve 15 is connected to the fourth valve 13, the other end of the fourth valve 13 is connected to the three-way joint 32, the fourth valve 13 is connected to the fifth interface 3201 on the three-way joint 32, the sixth interface 3202 on the three-way joint 32 is connected to the sixth check valve 20, the sixth interface 3202 on the three-way joint 32 is connected to the air inlet of the sixth check valve 20, and the fifth valve 14 is connected to the air outlet of the sixth check valve 20.

[0032] The seventh interface 3203 on the three-way joint 32 on the air outlet side of the first check valve 15 is connected to the second check valve 16, and is communicated with the air inlet of the second check valve 16. The air outlet of the second check valve 16 is connected to the four-way joint 31, and is communicated with the second interface 3102 on the four-way joint 31. The first interface 3101 on the four-way joint 31 is connected to the second blower 5, and is communicated with the air inlet of the second blower 5. The fourth interface 3104 on the four-way joint 31 is connected to the third check valve 17, and is communicated with the air outlet of the third check valve 17. The air inlet of the third check valve 17 is connected to the third valve 12. The third interface 3103 on the four-way joint 31 is connected to the fourth check valve 18, and is communicated with the air inlet of the fourth check valve 18. The air outlet is connected to the three-way joint 32, which is connected to the sixth interface 3202 on the three-way joint 32, the fifth interface 3201 on the three-way joint 32 is connected to the air outlet of the second blower 5, the seventh interface 3203 on the three-way joint 32 is connected to the third blower 6 and the fifth check valve 19 respectively, and is connected to the air inlet of the third blower 6 and the air inlet of the fifth check valve 19 respectively, the air outlet of the fifth check valve 19 is connected to the three-way joint 32, and is connected to the fifth interface 3201 on the three-way joint 32, the seventh interface 3203 on the three-way joint 32 is connected to the air outlet of the third blower 6, the sixth interface 3202 on the three-way joint 32 is connected to the seventh interface 3203 on the three-way joint 32 on the air inlet side of the sixth check valve 20.

[0033] A first temperature transmitter 21 and a first pressure transmitter 22 are connected in sequence between the air inlet of the first blower 4 and the first valve 10, a second temperature transmitter 23 is connected between the seventh interface 3203 on the three-way joint 32 on the air outlet side of the first check valve 15 and the second check valve 16, a second pressure transmitter 24 is connected between the first interface 3101 on the four-way joint 31 on the air outlet side of the third check valve 17 and the air inlet of the second blower 5, a third temperature transmitter 25 and a third pressure transmitter 26 are connected in sequence between the fifth interface 3201 on the three-way joint 32 on the air inlet side of the fifth check valve 19 and the air inlet of the third blower 6, and a fourth temperature transmitter 28 and a fourth pressure transmitter 29 are connected in sequence between the sixth interface 3202 on the three-way joint 32 on the air outlet side of the fifth check valve 19 and the seventh interface 3203 on the three-way joint 32 on the air inlet side of the sixth check valve 20.

[0034] Temperature transmitters and pressure transmitters can monitor the temperature of the transmitted gas and the gas pressure in the pipeline in real time. When the temperature or pressure is too high, it can be discovered and repaired in the first time to avoid related safety hazards.

[0035] A first cooler 7 is connected between the air outlet of the first blower 4 and the sixth interface 3202 on the three-way connector 32 on one side of the second valve 11, and a second cooler 8 is connected between the air outlet of the second blower 5 and the fifth interface 3201 on the three-way connector 32 on one side of the fourth check valve 18;

[0036] The third cooler 9 is connected between the air outlet of the third blower 6 and the seventh interface 3203 on the three-way joint 32 on one side of the air outlet of the fifth check valve 19 .

[0037] The cooler can cool down the gas at the blower outlet in the first time to prevent the transmission gas temperature from being too high and affecting the normal operation of the load equipment. At the same time, it can avoid the problem of accelerated aging of the connecting pipelines due to the high transmission gas temperature, further ensuring the overall service life of the gas transmission equipment.

[0038] A three-way joint 32 is connected between the fourth temperature transmitter 28 and the fourth pressure transmitter 29. The fourth temperature transmitter 28 and the fourth pressure transmitter 29 are respectively connected to the sixth interface 3202 and the seventh interface 3203 on the three-way joint 32. The fifth interface 3201 on the three-way joint 32 is connected to the pressure relief valve 27. The other end of the pressure relief valve 27 is connected to the seventh interface 3203 on the three-way joint 32 on the air inlet side of the first check valve 15.

[0039] When the pressure in the pipeline is too high and is not discovered in time, the pressure relief valve can release the pressure immediately to avoid safety accidents.

[0040] The three-stage series control Roots blower unit has the following steps for no-load switching:

[0041] No-load startup steps:

[0042] 1. Connect gas A, open the first valve 10 and the fourth valve 13, close the third valve 12 and the fifth valve 14, start the first blower 4, and the gas discharged from the air outlet of the first blower 4 flows back to the air inlet of the first blower 4 through the second check valve 16, the fourth check valve 18, the fifth check valve 19, and the fourth valve 13 in sequence, thereby realizing the no-load start of the first blower 4.

[0043] 2. After the first blower 4 runs stably, start the second blower 5. A portion of the gas exhausted from the air outlet of the first blower 4 flows back to the air inlet of the first blower 4 through the second blower 5, the fifth check valve 19, and the fourth valve 13 in sequence, thereby realizing the no-load start-up of the second blower 5.

[0044] 3. After the second blower 5 runs stably, start the third blower 6. A portion of the gas exhausted from the air outlets of the first blower 4 and the second blower 5 flows back to the air inlet of the first blower 4 through the third blower 6 and the fourth valve 13 in sequence, thereby realizing the no-load start-up of the third blower 6.

[0045] 4. After the third blower 6 runs stably, slowly close the fourth valve 13. When the outlet pressure of the third blower 6 is close to the gas outlet pressure, open the fifth valve 14. The gas passes through the sixth check valve 20 and the fifth valve 14 in sequence and enters the user load and starts to work normally.

[0046] 5. If another gas (gas B) needs to be mixed, after the user load runs stably, slowly open the third valve 12, and at the same time, increase the rotation speed of the second blower 5 and the third blower 6. At this time, gas B enters, and the pressure of gas B is equal to the exhaust pressure of the first blower 4. Gas B passes through the third valve 12 and the third check valve 17 in turn and enters the second blower 5, and mixes with gas A in the second blower 5. The mixed gas passes through the third blower 6 and enters the user load.

[0047] No-load shutdown steps:

[0048] 1. Open the second valve 11, and the airflow flows back to the air inlet of the first blower 4 through the second valve 11, so that the first blower 4 is shut down without load.

[0049] 2. While the second valve 11 is opened, reduce the rotation speed of the second blower 5 and the third blower 6. After the air inlet pressure of the second blower 5 and the third blower 6 is stabilized, close the first valve 10. At this time, the second check valve 16 is in a closed state due to the pressure difference between the front and rear.

[0050] 3. Open the fourth valve 13 and close the fifth valve 14 at the same time. The gas passing through the third blower 6 flows back to the air inlet of the second blower 5 through the fourth valve 13, the first check valve 15 and the second check valve 16 in sequence. After the pressure of the second blower 5 and the third blower 6 is stabilized, the second blower 5 and the third blower 6 are turned off to achieve no-load shutdown of the second blower 5 and the third blower 6.

[0051] The check valve can prevent the load gas from flowing back and causing damage to the blower and related facilities.

[0052] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A three-stage series controlled Roots blower unit, characterized by: A first blower, a second blower and a third blower are provided, wherein the first blower, the second blower and the third blower are respectively provided with a first drive motor, a second drive motor and a third drive motor; The air inlet of the first blower is connected to a four-way joint, and the four-way joint is provided with a first interface, a second interface, a third interface and a fourth interface, the air inlet of the first blower is in communication with the first interface, the second interface is connected to a first valve, the third interface is connected to a second valve, the other end of the second valve is connected to a three-way joint, and the three-way joint is provided with a fifth interface, a sixth interface and a seventh interface, the second valve is in communication with the fifth interface, the sixth interface is in communication with the air outlet of the first blower, the fourth interface is connected to a three-way joint, and is in communication with the sixth interface on the three-way joint, the fifth interface on the three-way joint is connected to a first check valve, and is in communication with the air inlet of the first check valve, the air outlet of the first check valve is connected to a three-way joint, and is in communication with the sixth interface on the three-way joint, and the fifth interface on the three-way joint is in communication with the seventh interface on the three-way joint on one side of the second valve; The seventh interface on the three-way joint at one side of the air inlet of the first check valve is connected to the fourth valve, the other end of the fourth valve is connected to the three-way joint, the fourth valve is connected to the fifth interface on the three-way joint, the sixth interface on the three-way joint is connected to the sixth check valve, the sixth interface on the three-way joint is connected to the air inlet of the sixth check valve, and the air outlet of the sixth check valve is connected to the fifth valve; The seventh interface on the three-way joint on the air outlet side of the first check valve is connected to the second check valve, which is communicated with the air inlet of the second check valve. The air outlet of the second check valve is connected to a four-way joint, which is communicated with the second interface on the four-way joint. The first interface on the four-way joint is connected to a second blower, which is communicated with the air inlet of the second blower. The fourth interface on the four-way joint is connected to a third check valve, which is communicated with the air outlet of the third check valve. The air inlet of the third check valve is connected to a third valve. The third interface on the four-way joint is connected to a fourth check valve, which is communicated with the air inlet of the fourth check valve. The air outlet of the fourth check valve is connected to a three-way joint, which is communicated with the sixth interface on the three-way joint, the fifth interface on the three-way joint is communicated with the air outlet of the second blower, the seventh interface on the three-way joint is respectively connected to the third blower and the fifth check valve, and is respectively communicated with the air inlet of the third blower and the air inlet of the fifth check valve, the air outlet of the fifth check valve is connected to a three-way joint, which is communicated with the fifth interface on the three-way joint, the seventh interface on the three-way joint is communicated with the air outlet of the third blower, and the sixth interface on the three-way joint is communicated with the seventh interface on the three-way joint on the air inlet side of the sixth check valve.

2. The three-stage cascade controlled Roots blower unit according to claim 1, characterized in that: A first temperature transmitter and a first pressure transmitter are connected in sequence between the air inlet of the first blower and the first valve; A second temperature transmitter is connected between the seventh interface on the three-way joint on the gas outlet side of the first check valve and the second check valve; A second pressure transmitter is connected between the first interface on the four-way joint on one side of the air outlet of the third check valve and the air inlet of the second blower; A third temperature transmitter and a third pressure transmitter are connected in sequence between a fifth interface on the three-way joint on the air inlet side of the fifth check valve and the air inlet of the third blower; A fourth temperature transmitter and a fourth pressure transmitter are connected in sequence between the sixth interface on the three-way joint on the air outlet side of the fifth check valve and the seventh interface on the three-way joint on the air inlet side of the sixth check valve.

3. The three-stage cascade controlled Roots blower unit according to claim 2 is characterized in that: A first cooler is connected between the air outlet of the first blower and the sixth interface on the three-way connector on one side of the second valve; A second cooler is connected between the air outlet of the second blower and the fifth interface on the three-way connector on one side of the fourth check valve; A third cooler is connected between the air outlet of the third blower and the seventh interface on the three-way joint on one side of the air outlet of the fifth check valve.

4. The three-stage cascade controlled Roots blower unit according to claim 3 is characterized in that: A three-way joint is connected between the fourth temperature transmitter and the fourth pressure transmitter. The fourth temperature transmitter and the fourth pressure transmitter are respectively connected to the sixth interface and the seventh interface on the three-way joint. The fifth interface on the three-way joint is connected to a pressure relief valve. The other end of the pressure relief valve is connected to the seventh interface on the three-way joint on the air inlet side of the first check valve.

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