Integrated two-stage high-pressure Roots blower

Abstract

The invention relates to the technical field of fans, in particular to an integrated two-stage high-pressure Roots blower which comprises a pump body and two transmission shafts rotationally connected to the interior of the pump body, and further comprises a first-stage pump cavity formed in the pump body, a first-stage impeller used for conducting primary pressurization on gas is arranged in the first-stage pump cavity, and a second-stage impeller used for conducting secondary pressurization on gas is arranged in the second-stage pump cavity. A secondary pump cavity is formed in the pump body, a secondary impeller used for conducting secondary pressurization on gas is arranged in the secondary pump cavity, a blow-by channel communicated with the interior of the secondary pump cavity is formed in the primary pump cavity, and the blow-by channel is used for conveying the gas subjected to primary pressurization. The first-stage impeller and the second-stage impeller are connected to the outer surfaces of the two transmission shafts; and the isolation plates are connected to the two sides of the pump body through bolts, ventilation cavities allowing nitrogen to enter are formed in the isolation plates, sealing assemblies are arranged in the isolation plates and used for isolating the pump body, and flowing gas in the pump body can be cooled while the sealing assemblies are cooled through the nitrogen in the ventilation cavities.

Description

Technical Field

[0001] The present invention relates to the technical field of blowers, and in particular to an integrated two-stage high-pressure Roots blower. Background Art

[0002] Roots blowers, as positive displacement blowers, offer numerous advantages, including stable air volume, a wide applicable pressure range, simple structure, easy maintenance, and strong adaptability to operating conditions. They are widely used in industrial fields such as sewage treatment, pneumatic conveying, and vacuum packaging. They are also widely used in industries such as power generation, chemical engineering, and steelmaking. However, due to limitations in their structural principles, the normal exhaust pressure of a single-stage Roots blower is approximately 50 kPa. If the exhaust pressure exceeds this value, two or more single-stage Roots blowers must be connected in series to meet the demand. However, the disadvantages of this method are high power consumption, low efficiency, a high failure rate, and a large footprint.

[0003] For example, the patent document with prior art publication number CN207673539U discloses a two-stage tandem Roots blower with automatic tensioning, comprising a base, a common base fixedly connected to the top of the base, a first Roots blower fixedly connected to the top of the common base, a first coupling fixedly connected to the shaft head of the first Roots blower, a bearing seat fixedly connected to one side of the first coupling, and a second coupling fixedly connected to the end of the bearing seat away from the first coupling. This patent document relates to the technical field of two-stage tandem Roots blowers. Under a constant flow rate, this two-stage tandem Roots blower with automatic tensioning increases the generated pressure, increases the pressure difference, improves the performance of the device, improves gas delivery efficiency, and contributes to improving production efficiency. The position of the motor can be easily adjusted so that the motor drives the first and second Roots blowers to operate simultaneously, reducing later operating and investment costs, having fewer wearing parts, and being easy to install, operate, and maintain.

[0004] To achieve high production efficiency, existing solutions employ a design that connects two Roots blowers in series to increase system pressure. However, a thorough analysis of actual operational performance and cost-effectiveness reveals significant drawbacks to this approach. Specifically, in a series configuration, each Roots blower requires a complete, independent housing and a complex series of connecting components. This design results in a significant number of components being redundant. Even under normal series operation, many components are not fully and effectively utilized, yet are still subject to the same mechanical loads and operational losses as a complete blower. This leads to excessive consumption and waste of component resources. Furthermore, this overuse of components is directly reflected in subsequent maintenance. The increased number of components significantly increases the potential for failure, significantly increasing the probability of equipment failure. Once a component fails, maintenance personnel not only need to inspect or replace the faulty component, but also, due to the interconnected nature of the components, may need to inspect and debug surrounding components. This significantly increases the complexity and workload of the maintenance work. Furthermore, a larger number of components requires a higher spare parts inventory, further driving up maintenance costs. To this end, the present application proposes an integrated two-stage high-pressure Roots blower. Summary of the Invention

[0005] The object of the present invention is to provide an integrated two-stage high-pressure Roots blower to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an integrated two-stage high-pressure Roots blower, comprising a pump body and two transmission shafts rotatably connected thereto, and further comprising: A primary pump chamber is provided inside the pump body, and a primary impeller for primary pressurizing the gas is provided inside the primary pump chamber. A secondary pump chamber is provided inside the pump body, and a secondary impeller for secondary pressurizing the gas is provided inside the secondary pump chamber. An air flow channel connected to the secondary pump chamber is provided inside the primary pump chamber, and the air flow channel is used to transport the gas after the primary pressurization. The primary impeller and the secondary impeller are both connected to the outer surfaces of the two transmission shafts. The isolation plate is connected to both sides of the pump body by bolts, and a ventilation cavity is opened inside the isolation plate for nitrogen to enter. A sealing component is provided inside the isolation plate for isolating the pump body, and the nitrogen passing through the ventilation cavity can cool the sealing component while cooling the flowing gas in the pump body.

[0007] Preferably, the sealing assembly includes a sealing plate fixedly connected to the inside of the isolation plate, and a lip seal ring for sealing the pump body is fixedly connected to the bottom of the sealing plate, and a ventilation collar sleeved on the outer surface of the transmission shaft is fixedly connected to the bottom of the isolation plate, and an air hole for nitrogen to pass into the pump body is opened inside the ventilation collar, and the lip seal ring and the ventilation collar form a closed space for nitrogen to flow through the ventilation cavity.

[0008] Preferably, both sides of the isolation plate are connected to the oil tank by bolts, and the two transmission shafts extend into the interior of the oil tank and are fixedly connected with meshing gears that mesh with each other. The outer surface of the transmission shaft is rotatably connected to the oil tank through a ball bearing, and a positioning ring is provided on the outer surface of the transmission shaft and on one side of the ball bearing. A pressure plate is fixedly connected to one side of the oil tank for fixing the positioning ring and the ball bearing.

[0009] Preferably, a pump body air inlet connected to the first-level pump chamber is opened on the top of the pump body, and a pre-muffler is connected to the top of the pump body air inlet for gas to enter the pump body, and a pre-filter is connected to the air inlet of the pre-muffler, and a first-level pump chamber air inlet is opened on the top of the first-level pump chamber for gas to enter.

[0010] Preferably, a secondary pump chamber air inlet is provided inside the secondary pump chamber for gas to enter, a pump body exhaust port is provided on one side of the secondary pump chamber for gas to be discharged, and the pump body exhaust port is bolted to an exhaust muffler for silencing the gas.

[0011] Preferably, an interstage condenser is also included, and a return air channel is provided at the bottom of the secondary pump chamber for communicating with the interstage condenser. A cooling air return port is provided on one side of the secondary pump chamber, and one end of the cooling air return port is fixedly connected to a return air pipe communicating with the interstage condenser. The return air channel is used to transport normal temperature gas into the interstage condenser for heat exchange and return to the secondary pump chamber through the return air pipe.

[0012] Preferably, a pipeline for storing nitrogen is provided inside the interstage condenser, and the nitrogen pipeline is threadedly connected to the ventilation cavity for conveying nitrogen.

[0013] Preferably, an oil cavity for lubricant to flow is provided inside the oil tank, and oil pipes communicating with the oil cavity are provided on both sides of the oil tank, and the two oil pipes are connected via a connecting pipe.

[0014] Preferably, oil storage chambers for storing lubricant are provided at both ends of the interstage condenser, and the oil storage chamber is connected to an oil inlet pipe connected to an oil pipeline, and another oil pipeline is connected to an oil return pipe for the lubricant to flow back into the oil storage chamber.

[0015] Preferably, it further comprises a motor, wherein the output end of the motor is connected to a single transmission shaft via a coupling.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The primary pump chamber and secondary pump chamber opened inside the pump body realize two-stage pressurization of the gas, which increases the output pressure of the fan. The primary pump chamber provides space for the initial pressurization of the gas. The primary impeller rotates in the primary pump chamber to perform initial pressurization on the gas, providing a basis for subsequent secondary pressurization. The secondary pump chamber provides space for the gas to be pressurized twice. The secondary impeller rotates in the secondary pump chamber to perform secondary pressurization on the gas pressurized by the primary pump, which increases the output pressure of the fan. The gas flow channel realizes the gas communication between the primary pump chamber and the secondary pump chamber. The gas pressurized by the primary pump enters the secondary pump chamber through the gas flow channel, realizing the series processing of the gas and improving the pressurization efficiency of the fan. The interstage condenser cools part of the gas and returns it to the secondary pump chamber through the return gas pipe. The cooled gas mixes with the original gas, realizing uniform cooling of the gas, reducing the gas temperature in the secondary pump chamber, and improving the operating stability and efficiency of the fan. This combination is particularly suitable for high temperature or high pressure application scenarios and can effectively prevent the fan from being damaged by overheating.

[0017] 2. The isolation plate is bolted to both sides of the pump body and contains a sealing assembly, effectively isolating the pump body from the oil tank. This prevents oil leakage from the oil tank from contaminating the pump body's conveying medium, and prevents pump body medium leakage from emulsifying the oil in the oil tank. The isolation plate effectively isolates the pump body from the oil tank, allowing the blower to operate under more complex environmental conditions. A vent cavity within the isolation plate allows nitrogen to enter, which enters the sealing assembly area through the vent cavity, providing not only cooling but also forming an air barrier seal. Nitrogen's chemical properties are stable, effectively isolating oxygen and reducing oxidation reactions on high-temperature component surfaces. Nitrogen flows rapidly at the lip seal, removing heat generated by friction from the seal area, reducing the operating temperature of the seal ring and thereby improving its wear resistance and service life. Moreover, after cooling the sealing components, nitrogen enters the pump body and mixes with the gas in the pump, further reducing the temperature of the gas in the pump and improving the working environment inside the pump. The two-stage pressurization design of the primary pump chamber and the secondary pump chamber, combined with the sealing and cooling of the isolation plate, the lubrication and support of the oil tank, and the cooling and lubricant storage of the interstage condenser, enables the fan to output higher pressure and flow with lower energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention with some frames removed; Figure 3 It is a schematic diagram of the local structure of the present invention; Figure 4Schematic diagram of the explosion structure of the pump body, isolation plate and oil tank in the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the pump body of the present invention; Figure 6 Schematic diagram of the structure of the first-stage impeller in the present invention; Figure 7 Schematic diagram of the structure of the secondary impeller in the present invention; Figure 8 Schematic diagram of the cross-sectional structure of the pump body, isolation plate and oil tank in the present invention; Figure 9 For the present invention Figure 8 A schematic diagram of the structure at center A; Figure 10 Schematic diagram of the structure inside the interstage condenser of the present invention.

[0019] In the figure: 100, pump body; 101, motor; 102, transmission shaft; 103, meshing gear; 200, primary pump chamber; 201, primary pump chamber air inlet; 202, cross-flow channel; 203, pump body air outlet; 204, pump body air inlet; 205, secondary pump chamber; 206, secondary pump chamber air inlet; 207, cooling air return port; 208, return air channel; 209, primary impeller; 210, secondary impeller; 211, pre-muffler; 212 , exhaust muffler; 213, return air pipe; 214, interstage condenser; 215, pre-filter; 300, isolation plate; 301, ventilation chamber; 302, pressure plate; 303, ball bearing; 304, positioning ring; 305, sealing plate; 306, lip seal ring; 307, ventilation collar; 308, nitrogen pipeline; 400, oil tank; 401, oil pipeline; 402, oil chamber; 403, connecting pipe; 404, oil inlet pipe; 405, oil return pipe. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 3 、 Figure 6 as well as Figure 7The present invention provides a technical solution: an integrated two-stage high-pressure Roots blower, comprising a pump body 100 and two transmission shafts 102 rotatably connected thereto, a motor 101, the output end of the motor 101 being connected to the single transmission shaft 102 via a coupling, a primary pump chamber 200, which is opened inside the pump body 100, and a primary impeller 209 for primary pressurization of the gas is provided inside the primary pump chamber 200, a secondary pump chamber 205 is opened inside the pump body 100, and a secondary impeller 210 for secondary pressurization of the gas is provided inside the secondary pump chamber 205, an air flow channel 202 is opened inside the primary pump chamber 200 to communicate with the secondary pump chamber 205, and the air flow channel 202 is used to transport the gas for primary pressurization. The compressed gas, and the first-stage impeller 209 and the second-stage impeller 210 are both connected to the outer surfaces of the two transmission shafts 102. The gas can be initially pressurized by setting a first-stage pump chamber 200, wherein the first-stage impeller 209 is placed in the first-stage pump chamber 200 for transmission and the gas passes through the first-stage impeller 209 from top to bottom, and then the setting of the air-flow channel 202 allows the gas pressurized by the first-stage impeller 209 to flow into the second-stage pump chamber 205, and then undergoes secondary pressurization through the second-stage impeller 210. Integrating the first-stage pump chamber 200 and the second-stage pump chamber 205 into the pump body 100 can reduce the floor space, and the synchronous rotation of the two transmission shafts 102 ensures the synchronous operation of the first-stage impeller 209 and the second-stage impeller 210, thereby improving the operating efficiency of the fan.

[0022] For further information, see Figure 2 、 Figure 5 as well as Figure 10The top of the pump body 100 is provided with a pump body air inlet 204 connected to the primary pump chamber 200, and the top of the pump body air inlet 204 is connected with a pre-muffler 211 for gas to enter the pump body 100, and the air inlet of the pre-muffler 211 is connected with a pre-filter 215. The top of the primary pump chamber 200 is provided with a primary pump chamber air inlet 201 for gas to enter, and the interior of the secondary pump chamber 205 is provided with a secondary pump chamber air inlet 206 for gas to enter, and one side of the secondary pump chamber 205 is provided with a pump body exhaust port 203 for gas to be discharged, and the pump body exhaust port 203 is bolted with an exhaust muffler 212 for silencing the gas, through The combination of the pump body air inlet 204 and the pre-silencer 211 can silence the incoming air, and the pre-filter 215 can filter the gas. The first-level pump chamber air inlet 201 and the second-level pump chamber air inlet 206 are both air inlets, which will form a series treatment of the gas under the action of the air flow channel 202. The pre-silencer 211 silences the incoming air, reducing the noise level of the fan. The pre-filter 215 filters the gas, removes impurities and particulate matter in the gas, and protects the internal components of the fan from wear. The two are used in combination to reduce noise and protect the internal components of the fan, thereby improving the service life and operational stability of the fan.

[0023] Furthermore, it also includes an interstage condenser 214, and a return air channel 208 is provided at the bottom of the secondary pump chamber 205 for communicating with the interstage condenser 214. A cooling air return port 207 is provided on one side of the secondary pump chamber 205, and one end of the cooling air return port 207 is fixedly connected to a return air pipe 213 communicating with the interstage condenser 214. The return air channel 208 is used to transport room temperature gas into the interstage condenser 214 for heat exchange and return to the secondary pump chamber 205 through the return air pipe 213. By setting the interstage condenser 214, the gas in the pump body 100 can be cooled, wherein the return air channel 208 supplies gas to enter the interstage condenser 214. Under the action of the secondary impeller 210, part of the gas will pass through the return air channel 208, and the gas entering the interstage condenser 214 will be cooled and then flow back to the secondary pump chamber 205 through the cooling air return port 207, pass through the secondary impeller 210, and mix with the original gas to achieve uniform cooling of the gas.

[0024] Specifically, by turning on the motor 101, a single transmission shaft 102 can be driven to rotate, and the meshing gear 103 can be used to make the two transmission shafts 102 rotate synchronously, thereby making the first-stage impeller 209 and the second-stage impeller 210 rotate to realize the gas delivery. When the first-stage impeller 209 rotates in the first-stage pump chamber 200, the gas will enter through the pump body air inlet 204. Before entering the pump body air inlet 204, the gas will first be filtered by the pre-filter 215 and silenced by the pre-muffler 211. The gas passes through the first-stage pump chamber air inlet 20 1 and then pass through the air flow channel 202 and enter the interior of the secondary pump chamber 205, and then be squeezed and transported by the secondary impeller 210 through the secondary pump chamber air inlet 206. Part of the gas will be discharged to the interior of the interstage condenser 214 through the return air channel 208 to be cooled, and then return to the cooling gas return port 207 through the return air pipe 213, and finally return to the secondary pump chamber 205 to mix with other gases to achieve cooling. The gas in the secondary pump chamber 205 will be discharged through the pump body exhaust port 203 and discharged through the exhaust muffler 212 for silencing.

[0025] In summary, the first-stage pump chamber 200 and the second-stage pump chamber 205 opened in the pump body 100 realize two-stage pressurization of the gas, thereby improving the output pressure of the blower. The first-stage pump chamber 200 provides a space for the gas to be initially pressurized. The first-stage impeller 209 rotates in the first-stage pump chamber 200 to perform initial pressurization on the gas, thereby providing a basis for subsequent secondary pressurization. The second-stage pump chamber 205 provides a space for the gas to be pressurized twice. The second-stage impeller 210 rotates in the second-stage pump chamber 205 to perform secondary pressurization on the gas that has undergone primary pressurization, thereby improving the output pressure of the blower. The gas string channel 202 realizes the first-stage pump chamber 200 and The gas between the secondary pump chambers 205 is connected, and the gas pressurized by the first stage enters the secondary pump chamber 205 through the gas string channel 202, realizing the series processing of the gas and improving the pressurization efficiency of the fan. The interstage condenser 214 cools part of the gas and returns it to the secondary pump chamber 205 through the return gas pipe 213. The cooled gas is mixed with the original gas to achieve uniform cooling of the gas, reduce the gas temperature in the secondary pump chamber 205, and improve the operating stability and efficiency of the fan. This combination method is particularly suitable for high-temperature or high-pressure application scenarios, and can effectively prevent the fan from being damaged by overheating.

[0026] Example 2: Please refer to Figure 4 、 Figure 8 as well as Figure 9The present invention also provides a technical solution, which is different from the technical solution of the first embodiment: an integrated two-stage high-pressure Roots blower, further comprising an isolation plate 300, which is connected to both sides of the pump body 100 by bolts, and a ventilation cavity 301 for nitrogen to enter is opened inside the isolation plate 300, and a sealing component is provided inside the isolation plate 300 for isolating the pump body 100, and the nitrogen passing through the ventilation cavity 301 can cool the sealing component while cooling the flowing gas in the pump body 100. By providing the isolation plate 300, the pump body 100 can be sealed, and the sealing component ensures that the conveying medium leaks out. The lip seal ring 306 utilizes its special lip-shaped structure to always maintain close contact with the shaft surface when the drive shaft 102 rotates at high speed, effectively preventing the medium from leaking along the axial direction.

[0027] The pump body 100 also includes an oil tank 400, bolted to both sides of the isolation plate 300. Two drive shafts 102 extend into the interior of the oil tank 400 and are fixedly connected to meshing gears 103. The outer surfaces of the drive shafts 102 are rotatably connected to the oil tank 400 via ball bearings 303. A retaining ring 304 is provided on the outer surface of the drive shaft 102, located on one side of the ball bearing 303. A pressure plate 302 is fixedly connected to one side of the oil tank 400 to secure the retaining ring 304 and the ball bearing 303. The provision of the oil tank 400 reinforces the pump body 100 while providing lubricant to the meshing gears 103 and replenishing lubricant to the ball bearings 303. The lubrication system within the oil tank 400 forms an efficient circulation path through an oil delivery pipe 401, a connecting pipe 403, and an oil return pipe 405. Lubricating oil is stored in the oil chamber 402 and precisely delivered to the meshing gears 103, ball bearings 303, and other areas requiring lubrication via the oil delivery pipe 401.

[0028] It is worth mentioning that the isolation plate 300 is arranged between the pump body 100 and the oil tank 400, which plays an isolation effect. The isolation between the two cavities is achieved through the sealing component, which solves the problem of oil leakage from the oil tank 400 contaminating the conveying medium in the pump body 100, and the problem of medium leakage from the pump body 100 causing emulsification of the lubricating oil in the oil tank 400. The set sealing component can well separate the two, but in actual operation, the high temperature generated by long-term operation causes the sealing component to wear and fail. The ventilation cavity 301 is set to allow nitrogen to enter, which can well provide cooling for the sealing component to keep it in a high-efficiency state.

[0029] The sealing assembly includes a sealing plate 305 fixedly connected to the interior of the isolation plate 300, and a lip seal ring 306 for sealing the pump body 100 is fixedly connected to the bottom of the sealing plate 305. A vent ring 307 is fixedly connected to the bottom of the isolation plate 300 and is sleeved on the outer surface of the drive shaft 102. The vent ring 307 has an air hole inside for nitrogen to pass into the pump body 100. The lip seal ring 306 and the vent ring 307 form a closed space for nitrogen to flow through the ventilation cavity 301. By providing the lip seal ring 306, high sealing performance can be achieved while increasing contact with nitrogen. The area can be quickly contacted with nitrogen to achieve cooling. After passing through the ventilation cavity 301, the nitrogen quickly contacts the lip seal ring 306 and carries heat through the air holes of the ventilation collar 307 into the pump body 100, thereby forming flowing gas, improving the heat dissipation efficiency. At the same time, the nitrogen is reused and mixed with the gas in the pump body 100 to further cool the gas transported in the pump body 100. The ventilation collar 307, through the air hole design inside it, forms a dynamic sealing space together with the lip seal ring 306, further enhancing the sealing effect, and providing nitrogen with an air barrier to achieve a sealing effect.

[0030] Furthermore, the oil tank 400 has an oil chamber 402 for lubricant flow. Oil pipes 401 are provided on both sides of the oil tank 400, each connected to the oil chamber 402. The two oil pipes 401 are connected via a connecting pipe 403. Both ends of the interstage condenser 214 have oil storage chambers for lubricant storage. Each oil storage chamber is connected to an oil inlet pipe 404 connected to the oil pipe 401. Another oil pipe 401 is connected to an oil return pipe 405 for lubricant to flow back into the oil storage chamber. The lubrication system within the oil tank 400 forms an efficient circulation path through the oil pipes 401, connecting pipes 403, and return pipes 405. Lubricant is stored in the oil chamber 402 and precisely delivered to the meshing gears 103 and ball bearings 303, among other areas requiring lubrication, via the oil pipes 401. The design of the connecting pipes 403 ensures that the lubricant is evenly distributed across different areas within the oil tank 400, ensuring consistent oil supply to each lubrication point.

[0031] For further information, see Figure 1 、 Figure 3 as well as Figure 10 A pipeline for storing nitrogen is provided inside the interstage condenser 214, and the nitrogen delivery pipe 308 is threadedly connected to the ventilation cavity 301 for delivering nitrogen. After adding a nitrogen seal at the lip seal ring 306, it can form an air barrier to achieve a sealing effect and can also effectively isolate oxygen to reduce oxidation on the surface of high-temperature parts.

[0032] Specifically, nitrogen stored in the interstage condenser 214 is delivered to the vent cavity 301 via nitrogen delivery pipe 308. The nitrogen purges the lip seal 306, cooling it and reducing the temperature generated by seal friction. The purged nitrogen then enters the pump body 100 through the vent collar 307, mixing with the gas inside and further cooling it. The nitrogen stored in the interstage condenser 214 exchanges heat with the gas entering through the return gas channel 208, achieving cooling. Interconnected oil reservoirs are provided at both ends of the interstage condenser 214. Lubricating oil is delivered to the oil delivery pipe 401 via the oil inlet pipe 404 and then enters the oil cavity 402, lubricating the gear train and bearings within the oil tank 400. The lubricating oil is then returned to the oil reservoir of the interstage condenser 214 through the cooperation of the connecting pipe 403 and the oil return pipe 405.

[0033] In summary, the isolation plate 300 is bolted to both sides of the pump body 100 and contains a sealing assembly. This effectively isolates the pump body 100 from the oil tank 400, preventing oil leakage from the oil tank 400 from contaminating the pumping medium within the pump body 100, and preventing leakage of the pump body 100 medium from causing emulsification of the lubricating oil in the oil tank 400. The isolation plate 300 effectively isolates the pump body 100 from the oil tank 400, enabling the blower to operate under more complex environmental conditions. A vent cavity 301 within the isolation plate 300 allows nitrogen to enter. Nitrogen enters the sealing assembly area through the vent cavity 301, providing cooling and forming an air barrier seal. Nitrogen has stable chemical properties and can effectively isolate oxygen, reducing oxidation reactions on the surfaces of high-temperature components. At the lip seal ring 306, nitrogen flows rapidly, removing heat generated by friction in the sealing area, reducing the operating temperature of the sealing ring, and thereby improving its wear resistance and service life. Moreover, after cooling the sealing assembly, nitrogen enters the pump body 100 and mixes with the gas in the pump, further reducing the temperature of the gas in the pump and improving the working environment in the pump. The two-stage pressurization design of the primary pump chamber 200 and the secondary pump chamber 205, combined with the sealing and cooling of the isolation plate 300, the lubrication and support of the oil tank 400, and the cooling and lubricant storage of the interstage condenser 214, enables the fan to output higher pressure and flow at lower energy consumption.

[0034] Working principle: When in use, the motor 101 is turned on to drive the single transmission shaft 102 to rotate, and the meshing gear 103 is used to make the two transmission shafts 102 rotate synchronously, thereby making the first-stage impeller 209 and the second-stage impeller 210 rotate to realize the gas delivery. When the first-stage impeller 209 rotates in the first-stage pump chamber 200, the gas will enter through the pump body air inlet 204. Before entering the pump body air inlet 204, the gas will first be filtered by the pre-filter 215 and silenced by the pre-muffler 211. The gas passes through the first-stage pump chamber air inlet After passing through the air flow channel 202, the gas enters the secondary pump chamber 205 and is then squeezed and transported by the secondary impeller 210 through the secondary pump chamber air inlet 206. Part of the gas is discharged to the interior of the interstage condenser 214 through the return air channel 208 for cooling. The gas then flows back to the cooling gas return port 207 through the return air pipe 213 and finally returns to the secondary pump chamber 205 to mix with other gases for cooling. The gas in the secondary pump chamber 205 is discharged through the pump body exhaust port 203 and is then discharged through the exhaust muffler 212 for silencing. At the same time, the nitrogen stored in the interstage condenser 214 is transported to the interior of the vent cavity 301 via the nitrogen delivery pipe 308. The nitrogen will purge the lip seal ring 306, cooling it and reducing the temperature generated by seal friction. The purged nitrogen will then enter the interior of the pump body 100 through the vent collar 307 and mix with the gas to further reduce the temperature. The nitrogen stored in the interstage condenser 214 will exchange heat with the gas entering through the return gas channel 208, achieving cooling. Interconnected oil storage chambers are provided at both ends of the interstage condenser 214. The lubricating oil will be transported to the oil delivery pipe 401 through the oil inlet pipe 404 and enter the oil chamber 402 to lubricate the gear set and bearings in the oil tank 400. With the cooperation of the connecting pipe 403 and the return oil pipe 405, the lubricating oil is returned to the oil storage chamber of the interstage condenser 214.

[0035] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An integrated two-stage high-pressure Roots blower, comprising a pump body (100) and two transmission shafts (102) rotatably connected thereto, characterized in that: Also includes: A primary pump chamber (200) is provided inside the pump body (100), and a primary impeller (209) for performing a primary pressurization on the gas is provided inside the primary pump chamber (200), a secondary pump chamber (205) is provided inside the pump body (100), and a secondary impeller (210) for performing a secondary pressurization on the gas is provided inside the secondary pump chamber (205), an air flow channel (202) connected to the secondary pump chamber (205) is provided inside the primary pump chamber (200), and the air flow channel (202) is used to transport the gas after the primary pressurization, and the primary impeller (209) and the secondary impeller (210) are both connected to the outer surfaces of the two transmission shafts (102); An isolation plate (300) is connected to both sides of the pump body (100) by bolts, and a ventilation cavity (301) is provided inside the isolation plate (300) for nitrogen to enter. A sealing component is provided inside the isolation plate (300) for isolating the pump body (100), and the nitrogen passing through the ventilation cavity (301) can cool the sealing component while cooling the flowing gas in the pump body (100).

2. The integrated two-stage high-pressure Roots blower according to claim 1, characterized in that: The sealing assembly comprises a sealing plate (305) fixedly connected to the interior of the isolation plate (300), and a lip seal ring (306) for sealing the pump body (100) is fixedly connected to the bottom of the sealing plate (305), a vent ring (307) sleeved on the outer surface of the transmission shaft (102) is fixedly connected to the bottom of the isolation plate (300), and an air hole is provided inside the vent ring (307) for nitrogen to pass into the pump body (100), and the lip seal ring (306) and the vent ring (307) form a closed space for nitrogen to flow through the vent cavity (301).

3. The integrated two-stage high-pressure Roots blower according to claim 1, characterized in that: Both sides of the isolation plate (300) are connected to the oil tank (400) via bolts, the two transmission shafts (102) extend into the interior of the oil tank (400) and are fixedly connected to mutually meshing gears (103), the outer surface of the transmission shaft (102) is rotatably connected to the oil tank (400) via a ball bearing (303), a positioning ring (304) is provided on the outer surface of the transmission shaft (102) and on one side of the ball bearing (303), and a pressure plate (302) is fixedly connected to one side of the oil tank (400) for fixing the positioning ring (304) and the ball bearing (303).

4. The integrated two-stage high-pressure Roots blower according to claim 1, characterized in that: The pump body (100) is provided with a pump body air inlet (204) on the top thereof, which is in communication with the primary pump chamber (200), and the top of the pump body air inlet (204) is connected to a pre-muffler (211) for allowing gas to enter the pump body (100), and the air inlet of the pre-muffler (211) is connected to a pre-filter (215), and the top of the primary pump chamber (200) is provided with a primary pump chamber air inlet (201) for allowing gas to enter.

5. The integrated two-stage high-pressure Roots blower according to claim 1, characterized in that: A secondary pump chamber air inlet (206) for gas to enter is provided inside the secondary pump chamber (205), a pump body air outlet (203) for gas to be discharged is provided on one side of the secondary pump chamber (205), and an exhaust muffler (212) for muffler gas is bolted to the pump body air outlet (203).

6. The integrated two-stage high-pressure Roots blower according to claim 3, characterized in that: The invention also includes an interstage condenser (214), a return air channel (208) is provided at the bottom of the secondary pump chamber (205) for communicating with the interstage condenser (214), a cooling air return port (207) is provided on one side of the secondary pump chamber (205), and one end of the cooling air return port (207) is fixedly connected to a return air pipe (213) communicating with the interstage condenser (214), and the return air channel (208) is used to transport normal temperature gas into the interstage condenser (214) for heat exchange and return to the secondary pump chamber (205) through the return air pipe (213).

7. The integrated two-stage high-pressure Roots blower according to claim 6, characterized in that: A pipeline for storing nitrogen is provided inside the interstage condenser (214), and the nitrogen delivery pipe (308) is threadedly connected to the ventilation cavity (301) for delivering nitrogen.

8. The integrated two-stage high-pressure Roots blower according to claim 6, characterized in that: An oil cavity (402) for lubricant flow is provided inside the oil tank (400), and oil delivery pipes (401) communicating with the oil cavity (402) are provided on both sides of the oil tank (400), and the two oil delivery pipes (401) are communicated with each other via a connecting pipe (403).

9. The integrated two-stage high-pressure Roots blower according to claim 8, characterized in that: Oil storage chambers for storing lubricant are provided at both ends of the interstage condenser (214), and the oil storage chamber is connected to an oil inlet pipe (404) connected to an oil delivery pipe (401), and another oil delivery pipe (401) is connected to an oil return pipe (405) for returning the lubricant to the oil storage chamber.

10. The integrated two-stage high-pressure Roots blower according to claim 1, characterized in that: It also includes a motor (101), wherein the output end of the motor (101) is connected to a single transmission shaft (102) via a coupling.

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