Integrated two-stage high-pressure roots blower

Abstract

The application relates to a fan technical field, in particular to a two-stage high-pressure Roots blower, which comprises a pump body and two transmission shafts rotatingly connected to the inside of the pump body, further comprises a first-stage pump cavity which is arranged in the inside of the pump body and is internally provided with a first-stage impeller for once pressurizing gas, the inside of the pump body is provided with a second-stage pump cavity, and the second-stage pump cavity is internally provided with a second-stage impeller for twice pressurizing gas, the first-stage pump cavity is internally provided with a gas connection channel which is connected to the second-stage pump cavity and is used for conveying once-pressurized gas, and the first-stage impeller and the second-stage impeller are both connected to the outer surfaces of the two transmission shafts; an isolation plate is connected to the two sides of the pump body through bolts, and the inside of the isolation plate is provided with a gas passage for nitrogen gas, the inside of the isolation plate is provided with a sealing assembly for isolating the pump body, and the nitrogen gas in the gas passage can cool the sealing assembly and cool the flowing gas in the pump body at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan, in particular to an integrated two-stage high-pressure Roots blower. BACKGROUND

[0002] As a kind of positive displacement blower, Roots blower has many advantages, such as stable air volume, wide applicable pressure range, simple structure, convenient maintenance and strong working condition adaptability, and is widely used in industrial fields such as sewage treatment, pneumatic conveying and vacuum packaging. It is also widely used in power, chemical industry, steel smelting and other industries. However, due to the limitation of its structure and principle, the normal exhaust pressure of single-stage Roots blower is about 50KPa. If the exhaust pressure exceeds this value, two or more single-stage Roots blowers need to be connected in series to meet the demand. But this method has the disadvantages of high power consumption, low efficiency, high failure rate and large floor area.

[0003] As prior art patent document No. CN207673539U, the patent document discloses a two-stage series Roots blower with automatic tensioning, comprising a base, the top of the base is fixedly connected with a shared base, the top of the shared base is fixedly connected with a first Roots blower, the shaft head of the first Roots blower is fixedly connected with a first coupling, and the side of the first coupling is fixedly connected with a bearing seat, the end of the bearing seat away from the first coupling is fixedly connected with a second coupling, which relates to the technical field of two-stage series Roots blower. The two-stage series Roots blower with automatic tensioning improves the generated pressure under the condition of certain flow, increases the pressure difference, improves the use effect of the device, improves the gas conveying efficiency, is conducive to improving the production efficiency, can conveniently adjust the position of the motor, makes the motor drive the first Roots blower and the second Roots blower to work at the same time, reduces the later operation and investment cost, has fewer wearing parts, and is convenient to install, operate and maintain.

[0004] In existing technical solutions, to achieve high production efficiency, a design approach of connecting two Roots blowers in series to increase system pressure is adopted. However, a deeper analysis from the perspective of actual operational effectiveness and cost-effectiveness reveals significant drawbacks to this approach. Specifically, in a series structure, each Roots blower requires a complete and independent casing and a series of complex connecting components. This design results in a large number of components being used redundantly. Even under normal series operation, many components do not fully utilize their functions, yet still bear the same mechanical load and operating losses as a single blower, undoubtedly leading to excessive consumption and waste of component resources. Moreover, this overuse of components directly impacts subsequent maintenance. The increased number of components also significantly increases potential failure points, leading to a marked increase in the probability of equipment failure. Once a part fails, maintenance personnel not only need to repair or replace the faulty component but may also need to inspect and adjust surrounding components due to the interconnectivity of the components, greatly increasing the complexity and workload of maintenance work. Simultaneously, more components mean higher spare parts requirements, further driving up maintenance costs. Therefore, this application proposes an integrated two-stage high-pressure Roots blower. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated two-stage high-pressure Roots blower to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated two-stage high-pressure Roots blower, comprising a pump body and two drive shafts rotatably connected therein, and further comprising:

[0007] A primary pump chamber is located inside the pump body, and a primary impeller is installed inside the primary pump chamber for pressurizing the gas once. A secondary pump chamber is located inside the pump body, and a secondary impeller is installed inside the secondary pump chamber for pressurizing the gas a second time. A gas passage is provided inside the primary pump chamber to connect to the secondary pump chamber. This gas passage is used to transport the gas after pressurization once. Both the primary impeller and the secondary impeller are connected to the outer surfaces of two drive shafts.

[0008] An isolation plate is bolted to both sides of the pump body and has a venting chamber for nitrogen to enter. The isolation plate has a sealing component inside for isolation of the pump body, and the nitrogen passing through the venting chamber can cool the sealing component and cool the gas flowing in the pump body at the same time.

[0009] Preferably, the sealing assembly comprises a sealing plate fixedly connected to the inside of the isolation plate, and the bottom of the sealing plate is fixedly connected with a lip seal ring for sealing the pump body, the bottom of the isolation plate is fixedly connected with a ventilation sleeve ring sleeved with the outer surface of the transmission shaft, and the inside of the ventilation sleeve ring is provided with a gas hole for the nitrogen to pass into the pump body, and the lip seal ring and the ventilation sleeve ring form a closed space for the nitrogen flowing through the ventilation cavity.

[0010] Preferably, the two sides of the isolation plate are both connected with an oil tank through bolts, the two transmission shafts are both extended into the inside of the oil tank and fixedly connected with meshing gears meshing with each other, the outer surface of the transmission shaft is rotatably connected with the oil tank through a ball bearing, the outer surface of the transmission shaft and located at one side of the ball bearing is provided with a positioning ring, and one side of the oil tank is fixedly connected with a pressing plate for fixing the positioning ring and the ball bearing.

[0011] Preferably, the top of the pump body is provided with a pump body air inlet communicated with the primary pump cavity, and the top of the pump body air inlet is connected with a front silencer for the gas to enter the inside of the pump body, the air inlet of the front silencer is connected with a front filter, and the top of the primary pump cavity is provided with a primary pump cavity air inlet for the gas to enter.

[0012] Preferably, the inside of the secondary pump cavity is provided with a secondary pump cavity air inlet for the gas to enter, one side of the secondary pump cavity is provided with a pump body air outlet for the gas to exhaust, and the pump body air outlet is bolted with an exhaust silencer for silencing the gas.

[0013] Preferably, it further comprises an inter-stage condenser, the bottom of the secondary pump cavity is provided with a gas return channel for communicating with the inter-stage condenser, one side of the secondary pump cavity is provided with a cooling gas return port, and one end of the cooling gas return port is fixedly connected with a gas return pipe communicated with the inter-stage condenser, and the gas return channel is used for conveying normal temperature gas into the inter-stage condenser to exchange heat and return to the secondary pump cavity through the gas return pipe.

[0014] Preferably, the inside of the inter-stage condenser is provided with a pipeline for storing nitrogen, and the nitrogen pipeline is threadedly connected with the ventilation cavity for conveying nitrogen.

[0015] Preferably, the inside of the oil tank is provided with an oil cavity for the lubricant to flow, the two sides of the oil tank are both provided with an oil conveying pipe communicated with the oil cavity, and the two oil conveying pipes are communicated through a communication pipe.

[0016] Preferably, the two ends of the inter-stage condenser are provided with an oil storage cavity for storing lubricant, the oil storage cavity is communicated with an oil inlet pipe communicated with the oil conveying pipe, and the other oil conveying pipe is communicated with an oil return pipe for returning the lubricant to the oil storage cavity.

[0017] Preferably, it further comprises a motor, and the output end of the motor is connected with a single transmission shaft through a shaft coupling.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. The first-stage pump cavity and the second-stage pump cavity inside the pump body realize two-stage pressurization of the gas, improve the output pressure of the fan, the first-stage pump cavity provides space for the initial pressurization of the gas, the first-stage impeller rotates in the first-stage pump cavity to initially pressurize the gas and provide a basis for subsequent second-stage pressurization, the second-stage pump cavity provides space for the secondary pressurization of the gas, the second-stage impeller rotates in the second-stage pump cavity to secondarily pressurize the gas that has been subjected to first-stage pressurization, thereby improving the output pressure of the fan, the series gas passage realizes the communication of the gas between the first-stage pump cavity and the second-stage pump cavity, the gas that has been subjected to first-stage pressurization enters the second-stage pump cavity through the series gas passage, thereby realizing the series processing of the gas and improving the pressurization efficiency of the fan, and the inter-stage condenser cools part of the gas and returns the cooled gas to the second-stage pump cavity through the return gas pipe, so that the cooled gas is mixed with the original gas, thereby realizing the uniform cooling of the gas, reducing the temperature of the gas in the second-stage pump cavity, and improving the operation stability and efficiency of the fan. This cooperation mode is particularly suitable for high-temperature or high-pressure application scenarios and can effectively prevent the fan from being damaged due to overheating.

[0020] 2. The isolation plate is connected to the two sides of the pump body by bolts and internally provided with a sealing assembly, effectively isolating the pump body from the oil tank to prevent the oil tank from leaking oil to contaminate the conveying medium in the pump body and the medium leakage of the pump body from causing the emulsification of the lubricating oil in the oil tank. The isolation plate effectively isolates the pump body from the oil tank, so that the fan can operate under more complex environmental conditions. The air cavity formed in the isolation plate is used for the entry of nitrogen gas, which enters the sealing assembly area through the air cavity, not only playing a cooling role but also forming a gas barrier seal. Nitrogen gas is chemically stable and can effectively isolate oxygen to reduce the oxidation reaction on the surface of high-temperature components. At the lip seal ring, nitrogen gas flows rapidly to carry away the heat generated by friction at the sealing position, thereby reducing the working temperature of the sealing ring and improving its wear resistance and service life. Moreover, after cooling the sealing assembly, the nitrogen gas enters the interior of the pump body and is mixed 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 first-stage pump cavity and the second-stage pump cavity, in combination 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 inter-stage condenser, enables the fan to output higher pressure and flow at lower energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0022] Figure 2 is a schematic diagram of the structure of the present application with part of the rack removed;

[0023] Figure 3 is a schematic diagram of the local structure of the present application;

[0024] Figure 4 It is the explosion structure schematic view of pump body, isolation plate and oil tank in the application;

[0025] Figure 5 It is the section structure schematic view of pump body in the application;

[0026] Figure 6 It is the structure schematic view of primary impeller in the application;

[0027] Figure 7 It is the structure schematic view of secondary impeller in the application;

[0028] Figure 8 It is the section structure schematic view of pump body, isolation plate and oil tank in the application;

[0029] Figure 9 It is the structure schematic view of pump body in the application; Figure 8 It is the structure schematic view of pump body in the application;

[0030] Figure 10 It is the structure schematic view of inter-stage condenser in the application.

[0031] In the figure: 100, pump body; 101, motor; 102, transmission shaft; 103, meshing gear; 200, primary pump cavity; 201, primary pump cavity air inlet; 202, air channel; 203, pump body air outlet; 204, pump body air inlet; 205, secondary pump cavity; 206, secondary pump cavity air inlet; 207, cooling gas return port; 208, gas return channel; 209, primary impeller; 210, secondary impeller; 211, front muffler; 212, exhaust muffler; 213, gas return pipe; 214, inter-stage condenser; 215, front filter; 300, isolation plate; 301, air cavity; 302, pressing plate; 303, ball bearing; 304, positioning ring; 305, sealing plate; 306, lip seal ring; 307, air sleeve ring; 308, nitrogen gas delivery pipe; 400, oil tank; 401, oil delivery pipe; 402, oil cavity; 403, communication pipe; 404, oil inlet pipe; 405, oil return pipe. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0033] Embodiment one: please refer to Figure 3 , Figure 6 and Figure 7The application provides a technical scheme: an integrated two-stage high-pressure Roots blower, which comprises a pump body 100 and two transmission shafts 102 rotatably connected to the inside of the pump body 100, further comprises a motor 101, the output end of the motor 101 is connected with the single transmission shaft 102 through a shaft coupling, further comprises a primary pump cavity 200 which is arranged in the inside of the pump body 100 and is provided with a primary impeller 209 for primary pressurization of gas, the inside of the pump body 100 is provided with a secondary pump cavity 205 which is provided with a secondary impeller 210 for secondary pressurization of gas, the primary pump cavity 200 is provided with a gas connecting channel 202 which is connected to the inside of the secondary pump cavity 205 and is used for conveying the primary pressurized gas, and the primary impeller 209 and the secondary impeller 210 are both connected to the outer surfaces of the two transmission shafts 102. The primary pump cavity 200 is arranged to provide the gas with primary pressurization treatment, the primary impeller 209 is arranged in the primary pump cavity 200 to drive the gas to pass through the primary impeller 209 from top to bottom, then the gas pressurized by the primary impeller 209 flows into the secondary pump cavity 205 through the gas connecting channel 202, and then is secondary pressurized by the secondary impeller 210. The primary pump cavity 200 and the secondary pump cavity 205 are integrated in the pump body 100, so that the floor area is reduced, the synchronous rotation of the two transmission shafts 102 ensures the synchronous work of the primary impeller 209 and the secondary impeller 210, and the operation efficiency of the blower is improved.

[0034] Further, please refer to Figure 2 、 Figure 5 and Figure 10The top of the pump body 100 is provided with a pump body air inlet 204 communicated with the first-stage pump cavity 200, and the top of the pump body air inlet 204 is connected with a front-mounted muffler 211 for the gas to enter the inside of the pump body 100, and the air inlet of the front-mounted muffler 211 is connected with a front-mounted filter 215, the top of the first-stage pump cavity 200 is provided with a first-stage pump cavity air inlet 201 for the gas to enter, the inside of the second-stage pump cavity 205 is provided with a second-stage pump cavity air inlet 206 for the gas to enter, one side of the second-stage pump cavity 205 is provided with a pump body air outlet 203 for the gas to exhaust, and the pump body air outlet 203 is bolted with an exhaust muffler 212 for the gas to be de-noised, the cooperation of the pump body air inlet 204 and the front-mounted muffler 211 can de-noise the air inlet, and the front-mounted filter 215 can filter the gas, the first-stage pump cavity air inlet 201 and the second-stage pump cavity air inlet 206 are both air inlets, which will form the series processing of the gas under the action of the series air channel 202, the front-mounted muffler 211 de-noises the air inlet, reduces the noise level of the fan, the front-mounted filter 215 filters the gas, removes the impurities and particulate matters in the gas, protects the internal components of the fan from being abraded, and the cooperation of the two reduces the noise and protects the internal components of the fan, improves the service life and operation stability of the fan.

[0035] Further, the inter-stage condenser 214 is further included, the bottom of the second-stage pump cavity 205 is provided with a return air channel 208 for being communicated with the inter-stage condenser 214, one side of the second-stage pump cavity 205 is provided with a cooling gas return port 207, and one end of the cooling gas return port 207 is fixedly connected with a return air pipe 213 communicated with the inter-stage condenser 214, the return air channel 208 is used for conveying the normal-temperature gas into the inter-stage condenser 214 to exchange heat and return to the second-stage pump cavity 205 through the return air pipe 213, the inter-stage condenser 214 can cool the gas in the pump body 100, the return air channel 208 is used for the gas to enter the inter-stage condenser 214, part of the gas will enter the inter-stage condenser 214 through the return air channel 208 under the action of the second-stage impeller 210, the gas entering the inter-stage condenser 214 will return to the second-stage pump cavity 205 through the cooling gas return port 207 after being cooled, pass through the second-stage impeller 210 and mix with the original gas to realize the uniform cooling of the gas.

[0036] Specifically, by starting the motor 101, the single transmission shaft 102 can be driven to rotate, and the two transmission shafts 102 are synchronized to rotate through the meshing gears 103, and then the first-stage impeller 209 and the second-stage impeller 210 are rotated to realize the delivery of the gas. When the first-stage impeller 209 rotates in the first-stage pump cavity 200, the gas enters through the pump body air inlet 204. Before entering the pump body air inlet 204, the gas will be first filtered by the pre-filter 215 and then be silenced by the pre-silencer 211. After the gas passes through the first-stage pump cavity air inlet 201, it enters the inside of the second-stage pump cavity 205 through the series gas passage 202, and then is extruded by the second-stage impeller 210 through the second-stage pump cavity air inlet 206 to be delivered. Part of the gas will be discharged to the inside of the inter-stage condenser 214 through the return gas passage 208, thereby being cooled and then flowing back to the cooling gas return port 207 through the return gas pipe 213, and finally returning to the second-stage pump cavity 205 to be mixed with other gas to realize cooling. The gas in the second-stage pump cavity 205 will be discharged through the pump body air outlet 203 and then be silenced by the exhaust silencer 212 to be discharged.

[0037] In summary, the first-stage pump cavity 200 and the second-stage pump cavity 205 inside the pump body 100 realize two-stage pressurization of the gas, thereby improving the output pressure of the fan. The first-stage pump cavity 200 provides a space for the initial pressurization of the gas. The first-stage impeller 209 rotates in the first-stage pump cavity 200 to initially pressurize the gas, thereby providing a basis for the subsequent second-stage pressurization. The second-stage pump cavity 205 provides a space for the second-stage pressurization of the gas. The second-stage impeller 210 rotates in the second-stage pump cavity 205 to secondarily pressurize the gas that has been initially pressurized, thereby improving the output pressure of the fan. The series gas passage 202 realizes the communication of the gas between the first-stage pump cavity 200 and the second-stage pump cavity 205. The gas that has been initially pressurized enters the second-stage pump cavity 205 through the series gas passage 202, thereby realizing the series processing of the gas and improving the pressurization efficiency of the fan. The inter-stage condenser 214 cools part of the gas and then flows back to the second-stage pump cavity 205 through the return gas pipe 213. The cooled gas is mixed with the original gas, thereby realizing the uniform cooling of the gas, reducing the temperature of the gas in the second-stage pump cavity 205, and improving the operation stability and efficiency of the fan. This cooperation mode is particularly suitable for high-temperature or high-pressure application scenarios, and can effectively prevent the fan from being damaged due to overheating.

[0038] Embodiment two: please refer to Figure 4 、 Figure 8 and Figure 9The application 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 connected to both sides of the pump body 100 by bolts, and an air cavity 301 for nitrogen entering is formed in the inside of the isolation plate 300, a sealing assembly is arranged in the inside of the isolation plate 300 for isolating the pump body 100, and the nitrogen passing through the air cavity 301 can cool the sealing assembly and cool the flowing gas in the pump body 100 at the same time, the pump body 100 can be sealed by arranging the isolation plate 300, and the sealing assembly ensures that the conveying medium does not leak, and the lip seal ring 306 can always be tightly attached to the surface of the shaft during high-speed rotation of the transmission shaft 102 by using the special lip-shaped structure, and effectively prevents the medium from leaking along the shaft.

[0039] Further comprising an oil tank 400 connected to both sides of the isolation plate 300 by bolts, both transmission shafts 102 extend into the inside of the oil tank 400 and are fixedly connected with meshing gears 103 meshing with each other, the outer surface of the transmission shaft 102 is rotatably connected with the oil tank 400 through a ball bearing 303, a positioning ring 304 is arranged on one side of the outer surface of the transmission shaft 102 and located at one side of the ball bearing 303, a pressing plate 302 is fixedly connected to one side of the oil tank 400 for fixing the positioning ring 304 and the ball bearing 303, the pump body 100 can be reinforced by arranging the oil tank 400, and the meshing gears 103 are provided with lubricant, and the ball bearing 303 is also provided with lubricant supplement, and the lubricating system in the oil tank 400 forms an efficient circulation path through an oil delivery pipe 401, a communication pipe 403 and an oil return pipe 405. The lubricating oil is stored in an oil cavity 402 and accurately delivered to the meshing gears 103 and the ball bearing 303 and other parts needing lubrication through the oil delivery pipe 401.

[0040] Wherein, the isolation plate 300 is arranged between the pump body 100 and the oil tank 400, which has an isolation effect, and the isolation between the two cavities is realized by the sealing assembly, which solves the problem of oil leakage of the oil tank 400 polluting the conveying medium in the pump body 100, and the problem of emulsification of the lubricating oil in the oil tank 400 caused by medium leakage of the pump body 100, and the sealing assembly arranged can well separate the two, but in actual operation, the sealing assembly is worn out due to the influence of high temperature generated by long-term operation, and the nitrogen entering the air cavity 301 can well cool the sealing assembly to keep it in a high-efficiency state.

[0041] The sealing assembly includes a sealing plate 305 fixedly connected to the inside of the isolation plate 300, and the bottom of the sealing plate 305 is fixedly connected with a lip seal ring 306 for sealing the pump body 100. The bottom of the isolation plate 300 is fixedly connected with a ventilation sleeve ring 307 sleeved on the outer surface of the transmission shaft 102, and the inside of the ventilation sleeve ring 307 is provided with a gas hole for the nitrogen to pass into the pump body 100. The lip seal ring 306 and the ventilation sleeve ring 307 form a closed space for the nitrogen flowing through the ventilation cavity 301. By arranging the lip seal ring 306, the contact area between the high sealing performance and the nitrogen can be increased, so that the nitrogen can be quickly contacted to realize the cooling. After the nitrogen passes through the ventilation cavity 301, it is quickly contacted with the lip seal ring 306 to carry the heat and enter the pump body 100 through the gas hole of the ventilation sleeve ring 307 to form flowing gas, thereby improving the heat dissipation efficiency. At the same time, the nitrogen is used twice and mixed with the gas in the pump body 100 to further cool the gas transported in the pump body 100. The ventilation sleeve ring 307 is designed with the gas hole in the inside, and the lip seal ring 306 forms a dynamic sealing space to further enhance the sealing effect, so that the nitrogen forms a gas barrier to achieve the sealing effect.

[0042] Further, the inside of the oil tank 400 is provided with an oil cavity 402 for the lubricant to flow, and the two sides of the oil tank 400 are provided with oil conveying pipes 401 in communication with the oil cavity 402, and the two oil conveying pipes 401 are communicated through a communication pipe 403. The two ends of the inter-stage condenser 214 are provided with oil storage cavities for storing lubricant, and the oil storage cavities are communicated with oil inlet pipes 404 communicated with the oil conveying pipes 401, and the other oil conveying pipe 401 is communicated with an oil return pipe 405 for returning the lubricant to the oil storage cavity. The lubricating system in the oil tank 400 forms a high-efficiency circulation path through the oil conveying pipes 401, the communication pipe 403 and the oil return pipe 405. The lubricating oil is stored in the oil cavity 402 and accurately conveyed to the meshing gear 103 and the ball bearing 303 and other parts needing lubrication through the oil conveying pipe 401. The design of the communication pipe 403 enables the lubricating oil to be uniformly distributed in different areas of the oil tank 400, ensuring the uniformity of oil supply at each lubricating point.

[0043] Further, please refer to Figure 1 、 Figure 3 and Figure 10 , the inside of the inter-stage condenser 214 is provided with a pipeline for storing nitrogen, and the nitrogen conveying pipe 308 is screwed with the ventilation cavity 301 for conveying nitrogen. After the nitrogen seal is increased at the lip seal ring 306, an air barrier can be formed to achieve the sealing effect, and oxygen can be effectively isolated to reduce the oxidation of the surface of the high-temperature part.

[0044] Specifically, the nitrogen stored in the inter-stage condenser 214 will be delivered to the inside of the vent cavity 301 through the nitrogen delivery pipe 308, and the nitrogen will be blown on the lip seal ring 306 to cool it, thereby reducing the temperature generated by the sealing friction, and the blown nitrogen will enter the inside of the pump body 100 through the venting collar 307 to mix with the gas and further achieve cooling. The nitrogen stored in the inter-stage condenser 214 will exchange heat with the gas entering its inside through the return gas channel 208 to achieve cooling. The inter-stage condenser 214 is provided with oil storage cavities at both ends which are in communication with each other, lubricating oil will be delivered to the oil delivery pipe 401 through the oil inlet pipe 404 to enter the inside of the oil cavity 402, thereby achieving lubrication of the gear set and bearings in the oil tank 400, and the lubricating oil will return to the oil storage cavities in the inter-stage condenser 214 under the cooperation of the communication pipe 403 and the oil return pipe 405.

[0045] In summary, the isolation plate 300 is connected to the two sides of the pump body 100 by bolts, and is internally provided with a sealing assembly, effectively isolating the pump body 100 from the oil tank 400, preventing the oil tank 400 from leaking and contaminating the delivery medium in the pump body 100, and preventing the lubricating oil in the oil tank 400 from being emulsified due to medium leakage from the pump body 100. The isolation plate 300 effectively isolates the pump body 100 from the oil tank 400, allowing the fan to operate in more complex environmental conditions. The vent cavity 301 is opened in the inside of the isolation plate 300 for nitrogen to enter, and the nitrogen enters the sealing assembly area through the vent cavity 301, not only playing a cooling role, but also forming an air barrier seal. Nitrogen is chemically stable and can effectively isolate oxygen, reducing oxidation reactions on the surface of high-temperature components. At the lip seal ring 306, the nitrogen flows quickly, taking away the heat generated by the friction at the sealing position, reducing the working temperature of the sealing ring, thereby improving its wear resistance and service life. Moreover, after cooling the sealing assembly, the nitrogen enters the inside of 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 cavity 200 and the secondary pump cavity 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 inter-stage condenser 214, allows the fan to output higher pressure and flow at lower energy consumption.

[0046] Working principle: in use, by opening the motor 101 can drive a single transmission shaft 102 rotation through the meshing gear 103 to make two transmission shaft 102 synchronous rotation, and then make the first impeller 209 and the second impeller 210 rotation to realize the delivery of gas, the first impeller 209 in the first pump cavity 200 rotation will make the gas through the pump inlet 204 into, the gas will be filtered by the pre filter 215 and through the pre silencer 211 before entering the pump inlet 204, the gas through the first pump cavity inlet 201 after passing through the gas channel 202 into the inside of the second pump cavity 205, then through the second pump cavity inlet 206 and be extruded by the second impeller 210 to be delivered, part of the gas will be discharged to the inside of the inter stage condenser 214 through the return gas channel 208, so as to be cooled and then backflow to the cooling gas return port 207 through the return gas pipe 213, finally back to the second pump cavity 205 and mix with other gas to realize cooling, the gas in the second pump cavity 205 will be discharged through the pump exhaust port 203 and be silenced by the exhaust silencer 212 to be discharged;

[0047] At the same time, the nitrogen stored in the inter stage condenser 214 will be delivered to the inside of the air cavity 301 through the nitrogen delivery pipe 308, the nitrogen will be swept on the lip seal ring 306 to cool it, so as to reduce the temperature generated by the sealing friction, and the nitrogen after being swept will enter the inside of the pump 100 through the air sleeve 307 and mix with the gas to further realize cooling. The nitrogen stored in the inter stage condenser 214 will exchange heat with the gas entering its inside through the return gas channel 208 to realize cooling;

[0048] And the inter stage condenser 214 is provided with oil storage cavities at both ends which are communicated with each other, the lubricating oil will be delivered to the oil delivery pipe 401 through the oil inlet pipe 404 to enter the inside of the oil cavity 402, to realize lubrication of the gear set and bearing in the oil tank 400, under the cooperation of the communication pipe 403 and the oil return pipe 405, the lubricating oil returns to the oil storage cavity in the inter stage condenser 214.

[0049] It should be noted that in this text, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes the elements inherent to such process, method, article or equipment.

[0050] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the 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 inside the pump body, characterized in that, Also include: The first pump cavity (200) is opened in the inside of the pump body (100), and the inside of the first pump cavity (200) is provided with a first impeller (209) for primary pressurization of gas, the inside of the pump body (100) is provided with a second pump cavity (205), and the inside of the second pump cavity (205) is provided with a second impeller (210) for secondary pressurization of gas, the inside of the first pump cavity (200) is provided with a gas communication channel (202) connected to the inside of the second pump cavity (205), which is used for conveying the primary pressurized gas, and the first impeller (209) and the second impeller (210) are connected to the outer surface of the two transmission shafts (102); The isolation plate (300) is connected to the two sides of the pump body (100) by bolts, and the inside of the isolation plate (300) is provided with a gas cavity (301) for nitrogen to enter, the inside of the isolation plate (300) is provided with a sealing assembly for the pump body (100) to be isolated, and the nitrogen passing through the gas cavity (301) can cool the sealing assembly and cool the flowing gas in the pump body (100); The sealing assembly includes a sealing plate (305) fixedly connected to the inside of the isolation plate (300), and the bottom of the sealing plate (305) is fixedly connected with a lip seal ring (306) for sealing the pump body (100), the bottom of the isolation plate (300) is fixedly connected with a gas sleeve ring (307) sleeved with the outer surface of the transmission shaft (102), and the inside of the gas sleeve ring (307) is provided with a gas hole for nitrogen to pass into the pump body (100), the lip seal ring (306) and the gas sleeve ring (307) form a closed space for nitrogen flowing through the gas cavity (301).

2. The integrated two-stage high pressure Roots blower of claim 1, wherein: The two sides of the isolation plate (300) are connected with the oil tank (400) by bolts, the two transmission shafts (102) extend into the inside of the oil tank (400) and are fixedly connected with meshing gears (103) meshing with each other, the outer surface of the transmission shaft (102) is rotatably connected with the oil tank (400) through a ball bearing (303), and the outer surface of the transmission shaft (102) and located on one side of the ball bearing (303) is provided with a positioning ring (304), one side of the oil tank (400) is fixedly connected with a pressing plate (302) for fixing the positioning ring (304) and the ball bearing (303).

3. The integrated two-stage high pressure Roots blower of claim 1, wherein: The top of the pump body (100) is provided with a pump body air inlet (204) communicated with the first pump cavity (200), and the top of the pump body air inlet (204) is connected with a front silencer (211) for gas entering the inside of the pump body (100), the air inlet of the front silencer (211) is connected with a front filter (215), and the top of the first pump cavity (200) is provided with a first pump cavity air inlet (201) for gas to enter.

4. The integrated two-stage high pressure Roots blower of claim 1, wherein: The inside of the secondary pump cavity (205) is provided with a secondary pump cavity air inlet (206) for gas entering, one side of the secondary pump cavity (205) is provided with a pump body air outlet (203) for gas discharging, and the pump body air outlet (203) is bolted with an exhaust muffler (212) for silencing the gas.

5. The integrated two-stage high pressure Roots blower of claim 2, wherein: It also includes an inter-stage condenser (214), the bottom of the secondary pump cavity (205) is provided with a gas return channel (208) for communicating with the inter-stage condenser (214), one side of the secondary pump cavity (205) is provided with a cooling gas return port (207), and one end of the cooling gas return port (207) is fixedly connected with a gas return pipe (213) in communication with the inter-stage condenser (214), the gas return channel (208) is used to transport normal temperature gas into the inter-stage condenser (214) for heat exchange and backflow to the secondary pump cavity (205) through the gas return pipe (213).

6. An integrated two-stage high pressure Roots blower as claimed in claim 5, characterized in that: The inside of the inter-stage condenser (214) is provided with a pipeline for storing nitrogen, and the nitrogen delivery pipe (308) is threadedly connected with the air cavity (301) for delivering nitrogen.

7. The integrated two-stage high pressure Roots blower of claim 5, wherein: The inside of the oil tank (400) is provided with an oil cavity (402) for lubricant flow, both sides of the oil tank (400) are provided with an oil delivery pipe (401) in communication with the oil cavity (402), and the two oil delivery pipes (401) are communicated through a communication pipe (403).

8. An integrated two-stage high pressure Roots blower as claimed in claim 7, wherein: Both ends of the inter-stage condenser (214) are provided with an oil storage cavity for storing lubricant, and the oil storage cavity is communicated with an oil inlet pipe (404) in communication with the oil delivery pipe (401), and the other oil delivery pipe (401) is communicated with an oil return pipe (405) for returning lubricant to the oil storage cavity.

9. The integrated two-stage high pressure Roots blower of claim 1, wherein: It also includes a motor (101), and the output end of the motor (101) is connected with a single transmission shaft (102) through a shaft coupling.

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