A gas pressurization system

Abstract

The utility model discloses a kind of gas pressurization systems, including gas pressurization equipment, the gas pressurization equipment has air inlet end and exhaust end, it is characterized by further including first switching valve, second switching valve, bypass valve, check valve, vent valve and backflow valve, the outlet end of first switching valve is connected with air inlet end, the inlet end of first switching valve is used to connect external gas source, the inlet end of backflow valve, the inlet end of check valve and the inlet end of vent valve are connected with exhaust end respectively, the outlet end of vent valve is connected with outside, the outlet end of backflow valve is connected with air inlet end, the outlet end of check valve is connected with the inlet end of second switching valve, the outlet end of second switching valve is used to connect with gas end, and the outlet end of second switching valve is connected with the inlet end of bypass valve, the outlet end of bypass valve is connected with the inlet end of first switching valve. Advantage is simple structure, can realize small amplitude pressurization to meet the pressurization scene use of variable working condition.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas pressurization technical field especially is related to a gas pressurization system. BACKGROUND

[0002] The gas pressurization equipment is a kind of device for improving gas pressure, it is generally used to pressurize low-pressure gas (such as nitrogen, air etc.) to higher pressure, to meet the needs of industry, laboratory or other applications.The working principle of gas pressurization equipment is generally based on the mechanical action of compressor or booster pump, generally is driven compressor using motor, gas is compressed and pressurized to the required pressure.So, the common gas pressurization equipment on the market is generally piston pressurizer, scroll pressurizer and screw pressurizer, the pressurization of above-mentioned pressurization equipment is larger, unit parameter is more fixed, in partial pressurization or pressurization ratio small occasion, it has certain use limitation. SUMMARY

[0003] The utility model provides a simple structure, can realize small amplitude pressurization to meet the pressurization scene of use of variable working condition's gas pressurization system.

[0004] The utility model discloses the technical scheme who adopts to solve above-mentioned technical problem: A kind of gas pressurization system, including gas pressurization equipment, the gas pressurization equipment has intake end and exhaust end, further including first switch valve, second switch valve, bypass valve, check valve, vent valve and backflow valve, the outlet end of first switch valve is connected with the intake end, the inlet end of first switch valve is used to connect external gas source, the inlet end of backflow valve, the inlet end of check valve and the inlet end of vent valve are connected with the exhaust end respectively, the outlet end of vent valve is communicated with external, the outlet end of backflow valve is connected with the intake end, the outlet end of check valve is connected with the inlet end of second switch valve, the outlet end of second switch valve is used to connect with gas end, and the outlet end of second switch valve is connected with the inlet end of bypass valve, the outlet end of bypass valve is connected with the inlet end of first switch valve.

[0005] Gas filtering device is arranged between the first switch valve and the intake end.

[0006] The gas pressurization equipment includes pressurization volute, the intake end of the pressurization volute is connected with a flow inducer, external air enters the pressurization volute from the flow inducer, the pressurization volute is rotatably provided with pressurization impeller, the pressurization impeller is driven to rotate by high-speed variable frequency permanent magnet motor, the pressurization volute is also provided with diffuser, the diffuser is arranged around the outer periphery of the pressurization impeller.

[0007] The high-speed variable frequency permanent magnet motor comprises a motor shell, a rotor rotatably arranged in the motor shell, and a first end and a second end respectively arranged at axially opposite ends of the rotor, wherein the first end and the second end are respectively supported and installed in the motor shell through air suspension bearings, an output shaft is coaxially arranged on the first end, the output shaft extends into the pressurizing volute from the rear end of the pressurizing volute and is fixedly connected with the pressurizing impeller in a coaxial manner.

[0008] A sealing member is arranged on a port of the pressurizing volute for preventing gas in the pressurizing volute from leaking out.

[0009] A sealing member positioning recess is recessed and arranged at a position where the sealing member is installed in the pressurizing volute, a positioning protrusion is protrusively arranged at the rear end of the pressurizing impeller towards the rotor, the positioning protrusion is coaxial with the output shaft, the sealing member has an installation hole penetrating in an axial direction, the sealing member is sleeved and installed on the positioning protrusion through the installation hole, the sealing member is arranged in the sealing member positioning recess, and an outer wall of the sealing member is tightly attached to an inner side wall of the sealing member positioning recess.

[0010] A plurality of first annular sealing ribs are protrusively arranged in the installation hole, the first annular sealing ribs are arranged at intervals, annular first sealing recesses are formed between the first annular sealing ribs adjacent in the axial direction, and top ends of the first annular sealing ribs are in contact with the positioning protrusion. A plurality of second annular sealing ribs are protrusively arranged on a front end surface of the sealing member towards a rear end surface direction of the pressurizing impeller, the second annular sealing ribs are arranged at intervals, annular second sealing recesses are formed between the second annular sealing ribs adjacent in the radial direction, and top ends of the second annular sealing ribs are in contact with the rear end surface of the pressurizing impeller.

[0011] The second end is coaxially fixedly connected with a cooling impeller.

[0012] A thrust bearing is arranged at the rear end of the cooling impeller Compared with the prior art, the utility model has the advantages of simple structure, integrated design of the multi-valve combination, significant improvement of the use flexibility and application range of the system while maintaining the basic function of the gas pressurizing equipment, and suitability for use in application scenarios with high requirements for pressure control accuracy and working condition adaptability, which is specifically shown in that: (1) By setting the first switching valve, the second switching valve and the bypass valve, the flexible switching and combination of the gas source path are realized, so that the system can adapt to different working condition requirements (such as local supercharging, small supercharging occasions), and the limitations of the fixed parameters of the traditional supercharging equipment and the limited application occasions are effectively overcome; (2) By setting the backflow valve, part of the high-pressure gas is allowed to flow back to the supercharging equipment, so as to form internal circulation, reduce the frequent start-stop of the equipment when the required pressure is low, realize the stable regulation of the pressure and the reduction of the energy consumption; (3) The check valve is used to prevent the reverse flow of high-pressure gas, so as to protect the equipment on the low-pressure side from being impacted; the vent valve is used to timely vent and release pressure when the system is overpressure or shutdown, so as to avoid the danger caused by high pressure and ensure the safety and reliability of the overall operation of the system; (4) Different working modes can be switched by valve switching, and the system can cope with diversified working conditions with simple operation control. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a system structure schematic view of the utility model; Figure 2 It is a partial structure schematic view of the gas supercharging equipment in the utility model; Figure 3 It is Figure 2 It is an enlarged structure schematic view of A in the utility model; Figure 4 It is Figure 3 It is an enlarged structure schematic view of B in the utility model. DETAILED DESCRIPTION

[0014] The utility model will be further described in detail in combination with the embodiments of the drawings.

[0015] As shown in the figure, a kind of gas supercharging system, including gas supercharging equipment, gas supercharging equipment has intake end 11 and exhaust end 12, also include first switching valve F1, second switching valve F2, bypass valve F3, check valve F4, vent valve F5 and backflow valve F6, the outlet end of first switching valve F1 is connected with intake end 11, the inlet end of first switching valve F1 is used to connect external gas source, the inlet end of backflow valve F6, the inlet end of check valve F4 and the inlet end of vent valve F5 are connected with exhaust end 12 respectively, the outlet end of vent valve F5 is communicated with external, the outlet end of backflow valve F6 is connected with intake end 11, the outlet end of check valve F4 is connected with the inlet end of second switching valve F2, the outlet end of second switching valve F2 is used to connect with gas end, and the outlet end of second switching valve F2 is connected with the inlet end of bypass valve F3, the outlet end of bypass valve F3 is connected with the inlet end of first switching valve F1.

[0016] In this specific embodiment, a gas filter device G1 is provided between the first switching valve F1 and the air inlet 11. By providing the gas filter device G1 after the first switching valve F1, a clean air source is provided for the gas booster equipment, effectively protecting it from contamination damage, improving system reliability, and reducing maintenance costs.

[0017] In this specific embodiment, the gas booster includes a booster housing 1, which has an inlet end 11 and an outlet end 12. A guide vane 2 is connected to the inlet end 11, and external air enters the booster housing 1 through the guide vane 2. A booster impeller 3 is rotatably arranged inside the booster housing 1, and the booster impeller 3 is driven to rotate by a high-speed variable frequency permanent magnet motor 4. A diffuser 9 is also arranged inside the booster housing 1, and the diffuser 9 is arranged around the outer periphery of the booster impeller 3. A high-speed variable frequency permanent magnet motor 4 directly drives the booster impeller 3. The permanent magnet motor itself is highly efficient, and combined with variable frequency technology, the motor speed can be steplessly adjusted according to actual needs, thereby precisely controlling the boost ratio and flow rate. The outlet pressure can be linearly and quickly adjusted by changing the motor speed, resulting in fast response and high control precision. This flexibility allows it to easily adapt to changing working requirements, achieving on-demand boosting and enhancing its applicability in special or fluctuating working conditions. The structure of the booster impeller 3 and booster volute 1 is simple and compact, making the equipment smaller and lighter, suitable for applications in localized boosting or space-constrained scenarios. Its boosting characteristics are particularly suitable for handling high flow rates and medium to low boost ratios. External compressed air passes through the guide vane 2, and under the high-speed rotation of the booster impeller 3, the gas pressure and flow rate increase. Then, under the action of the diffuser 9 and the booster volute 1, the pressure is further increased through deceleration and diffusion.

[0018] In this specific embodiment, the high-speed variable frequency permanent magnet motor 4 includes a motor housing 41, within which a rotor 42 is rotatably mounted. The rotor 42 has two axially opposite ends, a first end and a second end, respectively. The first and second ends are supported and mounted within the motor housing 41 by air suspension bearings 5. An output shaft 43 is coaxially mounted on the first end, extending from the rear end of the booster volute 1 into the booster volute 1 and fixedly connected coaxially to the booster impeller 3. The air suspension bearings 5 ​​have almost no mechanical contact and minimal frictional resistance, allowing the rotor 42 to reach extremely high speeds, thus meeting the linear velocity requirements of the booster impeller 3 for efficient boosting, while simultaneously reducing drive losses and improving overall machine efficiency. The use of air suspension bearings 5 ​​achieves "oil-free lubrication," ensuring the purity of the compressed gas and effectively avoiding the wear problems of traditional mechanical bearings, significantly reducing maintenance requirements and extending the equipment's service life.

[0019] In this specific embodiment, a seal 7 is provided on the port on the booster housing 1 where the output shaft 43 extends for installation, to prevent gas leakage from the booster housing 1. The seal 7 prevents leakage of compressed gas, thus saving energy and preventing potential safety hazards caused by gas leakage.

[0020] In this specific embodiment, a sealing element positioning cavity (not shown in the figure) is recessed within the booster housing 1 at the installation position corresponding to the sealing element 7. A positioning protrusion 31 is protruding from the rear end of the booster impeller 3 towards the rotor 42. The positioning protrusion 31 is coaxial with the output shaft 43. The sealing element 7 has an axially penetrating mounting hole (not shown in the figure). The sealing element 7 is fitted onto the positioning protrusion 31 through the mounting hole. The sealing element 7 is located within the sealing element positioning cavity, and its outer wall is tightly fitted against the inner wall of the sealing element positioning cavity. Through the cooperation of the positioning cavity and the positioning protrusion 31, the sealing element 7 is quickly and accurately aligned and fixed, ensuring that the sealing element 7 will not shift or loosen during operation, thus guaranteeing the reliability of the sealing effect. This positioning structure simplifies the assembly process and improves production efficiency and assembly quality.

[0021] In this specific embodiment, the mounting hole is provided with a plurality of first annular sealing ribs 71, which are spaced apart. Adjacent first annular sealing ribs 71 form an annular first sealing cavity 72. The top of each first annular sealing rib 71 contacts the positioning protrusion 31. This structure creates a labyrinthine sealing effect, greatly increasing the resistance to gas leakage along the surface of the positioning protrusion 31 of the booster impeller 3, effectively preventing radial leakage paths. Even with slight axial or radial movement, continuous sealing contact can be maintained through these multiple sealing ribs, exhibiting good adaptability and sealing reliability.

[0022] In this specific embodiment, a plurality of second annular sealing ribs 73 are protruding from the front end face of the seal 7 toward the rear end face of the booster impeller 3. These second annular sealing ribs 73 are spaced apart, and an annular second sealing cavity 74 is formed between radially adjacent second annular sealing ribs 73. The top end of each second annular sealing rib 73 contacts the rear end face of the booster impeller 3. This structure forms a multi-stage sealing barrier between the seal 7 and the end face of the booster impeller 3, effectively preventing gas leakage through the axial gap.

[0023] In this specific embodiment, the air suspension bearing 5 is a hydrodynamic air foil bearing.

[0024] In this specific embodiment, a cooling impeller 8 is coaxially fixedly connected to the second end. The rotation of the rotor 42 drives the cooling impeller 8, generating forced airflow to effectively cool the motor's interior (especially the permanent magnets and coils). This eliminates the need for an additional cooling fan or cooling system, resulting in a compact and efficient structure. Effective heat dissipation prevents magnet demagnetization or insulation aging due to excessive temperature rise, ensuring stable operation of the high-speed permanent magnet motor at high power density and extending its lifespan.

[0025] In this specific embodiment, a thrust bearing 6 is provided at the rear end of the cooling impeller 8. Working in conjunction with the thrust bearing 6 at the output end, they balance the bidirectional axial forces that may be generated by the rotor 42 during operation, making the axial positioning of the rotor 42 system more stable. The combined use of two thrust bearings 6 enhances the axial rigidity of the rotor 42 system, further suppressing vibrations under high-speed operation and improving the overall stability and reliability of the equipment.

[0026] The specific working principle is as follows: After passing through the first switching valve F1, the pressurized gas enters the gas filter device G1. After filtration, the gas is drawn into the booster housing 1. The intake system is completely sealed. Under the action of the high-speed booster impeller 3, the pressurized intake gas is boosted to a higher pressure. After boosting, the gas is then delivered to the gas consumption end through the exhaust end 12, check valve F4, and second switching valve F2.

[0027] The entire system is controlled by a corresponding controller to achieve adjustable boost flow and pressure. Specifically, when the controller sets the corresponding boost pressure, the control system adjusts the position of the corresponding switching valve. Based on the current intake pressure of the system, the speed of the high-speed variable frequency permanent magnet motor 4 is determined. The control system can adjust the speed and, in conjunction with the return valve F6, ensure constant pressure output of the booster equipment. When boosting stops, the system will automatically control the switching operation of the valve.

[0028] In the shutdown state, the first switching valve F1, the second switching valve F2, the return valve F6, and the bypass valve F3 are all open, and the vent valve F5 is closed, thus shutting down the gas booster equipment. In the normal operation state, the first switching valve F1 and the second switching valve F2 remain open, the vent valve F5 and the bypass valve F3 are both closed, and the return valve F6 is opened and closed according to the specific operating conditions, thus operating the gas booster equipment. In the over-pressure state, the gas booster equipment continues to operate, the first switching valve F1, the second switching valve F2, the return valve F6, and the vent valve F5 are all open, and the bypass valve F3 is closed. When operation ends, the gas booster equipment shuts down, the bypass valve F3 opens, and all other valves except the bypass valve F3 are closed.

[0029] Assuming the compressed air source pressure 0.5±0.01MPa, the present need 0.8MPa use pressure. In the process of setting the pressure 0.8MPa, the first switch valve F1 and the second switch valve F2 keep open state, the exhaust valve F5 and bypass valve F3 are in the closed state, the backflow valve F6 is opened and then slowly closed. After the backflow valve F6 is fully closed, the system detects the exhaust pressure, if the pressure is lower than 0.8MPa control system, then improve the running speed, if the pressure is higher than 0.8MPa control system, then reduce the running speed, until the exhaust pressure is stable at the set point.

Claims

1. A gas boosting system, comprising a gas boosting device, said gas boosting device having an inlet end and an exhaust end, characterized in that... It also includes a first switching valve, a second switching valve, a bypass valve, a check valve, a vent valve, and a return valve. The outlet end of the first switching valve is connected to the air inlet end, and the inlet end of the first switching valve is used to connect to an external air source. The inlet ends of the return valve, the check valve, and the vent valve are respectively connected to the exhaust end. The outlet end of the vent valve is connected to the outside. The outlet end of the return valve is connected to the air inlet end. The outlet end of the check valve is connected to the inlet end of the second switching valve. The outlet end of the second switching valve is used to connect to the air consumption end, and the outlet end of the second switching valve is connected to the inlet end of the bypass valve. The outlet end of the bypass valve is connected to the inlet end of the first switching valve.

2. The gas boosting system as described in claim 1, characterized in that... A gas filter is provided between the first switching valve and the air inlet.

3. The gas boosting system as described in claim 1, characterized in that... The gas booster device includes a booster casing with an inlet and an outlet. A guide vane is connected to the inlet, through which external air enters the booster casing. A booster impeller is rotatably mounted inside the booster casing and driven to rotate by a high-speed variable frequency permanent magnet motor. A diffuser is also mounted inside the booster casing and surrounds the outer periphery of the booster impeller.

4. A gas booster system as described in claim 3, characterized in that... The high-speed variable frequency permanent magnet motor includes a motor housing, in which a rotor is rotatably disposed. The rotor has two axially opposite ends, namely a first end and a second end. The first end and the second end are respectively supported and mounted in the motor housing by air suspension bearings. An output shaft is coaxially disposed on the first end. The output shaft extends from the rear end of the booster volute into the booster volute and is coaxially and fixedly connected to the booster impeller.

5. A gas booster system as described in claim 4, characterized in that... The port on the booster housing where the output shaft extends for installation is provided with a seal to prevent gas leakage from the booster housing.

6. A gas booster system as described in claim 5, characterized in that... The booster housing has a recessed positioning cavity for the seal at the installation position of the seal. The rear end of the booster impeller has a protruding positioning protrusion facing the rotor. The positioning protrusion is coaxial with the output shaft. The seal has an axially penetrating mounting hole. The seal is fitted onto the positioning protrusion through the mounting hole. The seal is located in the positioning cavity, and the outer wall of the seal is in close contact with the inner wall of the positioning cavity.

7. A gas booster system as described in claim 6, characterized in that... The mounting hole is provided with a plurality of first annular sealing ribs, which are spaced apart. An annular first sealing cavity is formed between adjacent first annular sealing ribs along the axial direction. The top of the first annular sealing rib is in contact with the positioning protrusion. The front end face of the seal is provided with a plurality of second annular sealing ribs protruding towards the rear end face of the booster impeller. The plurality of second annular sealing ribs are spaced apart, and an annular second sealing cavity is formed between radially adjacent second annular sealing ribs. The top end of the second annular sealing ribs is in contact with the rear end face of the booster impeller.

8. A gas booster system as described in claim 4, characterized in that... A cooling impeller is coaxially fixedly connected to the second end.

9. A gas booster system as described in claim 8, characterized in that... The rear end of the cooling impeller is provided with a thrust bearing.

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