A multi-stage roots high-pressure air pump

Abstract

The utility model discloses a multistage roots high pressure gas pump belongs to the technical field of gas pump, including pump body assembly, the pump body assembly includes the upper casing and lower casing through the fixed bolt, the pump body assembly is divided with first stage booster chamber, second stage booster chamber and third stage booster chamber in the part, is provided with two mutually coordinated rotors of rotation in each booster chamber, and the pump body assembly is equipped with the rotation rod who is used for driving the rotation of rotor and is penetrated through rotor, the pump body assembly is equipped with the conveying channel of intercommunication adjacent booster chamber, the conveying channel includes the first conveying channel of intercommunication first stage booster chamber bottom and second stage booster chamber top, and the second conveying channel of intercommunication second stage booster chamber bottom and third stage booster chamber top, the pump body assembly is equipped with the cooling channel for cooling the gas in conveying channel. The utility model provides a kind of highly integrated and can effectively control the gas pump of gas temperature.

Description

Technical Field

[0001] This utility model relates to the field of air pump technology, and in particular to a multi-stage Roots high-pressure air pump. Background Technology

[0002] Roots pumps, as a common oil-free gas booster device, are widely used in gas transportation and boosting in industries such as chemical, pharmaceutical, food, and electronics due to their simple structure, reliable operation, and convenient maintenance.

[0003] Single-stage Roots pumps typically only achieve pressurization in the low to medium pressure range, making it difficult to meet the needs of high-pressure operations. Furthermore, the gas temperature rises significantly during single-stage compression. Without effective cooling measures, this can easily lead to excessive expansion or even damage to critical components such as rotors and bearings, affecting the equipment's service life and operational stability. Additionally, the high-temperature gas from single-stage compression directly entering subsequent equipment or processes increases the cooling burden on downstream processes and raises the overall power consumption of the machine. Utility Model Content

[0004] The purpose of this invention is to provide a highly integrated air pump that can effectively control gas temperature.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a multi-stage Roots high-pressure air pump, comprising a pump body assembly, wherein the pump body assembly comprises an upper housing and a lower housing fixed by fixing bolts, and the pump body assembly is internally divided into a first-stage pressurization chamber, a second-stage pressurization chamber and a third-stage pressurization chamber;

[0006] Each pressurization chamber is equipped with two rotors that rotate in coordination with each other, and the pump assembly is provided with a rotating rod that passes through the rotors and is used to drive the rotors to rotate;

[0007] The pump assembly is provided with a conveying channel connecting adjacent boosting chambers. The conveying channel includes a first conveying channel connecting the bottom of the first-stage boosting chamber and the top of the second-stage boosting chamber, and a second conveying channel connecting the bottom of the second-stage boosting chamber and the top of the third-stage boosting chamber.

[0008] The pump assembly is provided with a cooling channel for cooling the gas in the delivery channel, and the pump assembly is provided with a main cooler that communicates with the cooling channel.

[0009] As a further description of the above technical solution: the top of the upper housing is provided with a gas input pipe communicating with the first-stage pressurization chamber, and the bottom of the lower housing is provided with a gas output pipe communicating with the third-stage pressurization chamber.

[0010] As a further description of the above technical solution: the cooling channels are respectively arranged on both sides of the first conveying channel and the second conveying channel.

[0011] As a further description of the above technical solution: the main cooler is integrated into the top wall of the upper shell, and the cooling channel and the main cooler constitute a closed-loop cooling system.

[0012] As a further description of the above technical solution: it also includes a synchronizing gear disposed at the end of the rotating rod, and the synchronizing gears on the two rotating rods mesh with each other.

[0013] As a further description of the above technical solution: several limiting grooves are evenly distributed circumferentially on the inner wall of the rotor center hole, and a limiting block that cooperates with the limiting groove is fixed on the outer ring of the rotating rod located in the center hole.

[0014] As a further description of the above technical solution: the rotor blade shape is two-bladed, three-bladed or four-bladed.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. By integrating the three-stage pressurization chamber and cooling channel into the same pair of upper and lower housings, the equipment size and floor space are greatly reduced compared to the traditional method of using three independent pumps and two external coolers in series, and the complexity of pipeline connections and potential leakage points are also reduced.

[0017] 2. By using a three-stage series booster, the output pressure can be much higher than that of a single-stage Roots pump. At the same time, it reduces the suction temperature of subsequent cascades, reduces compression power consumption, and improves the overall thermodynamic efficiency of the pump.

[0018] 3. Effective temperature control avoids the risk of overheating, excessive expansion, performance degradation, or damage to key components such as rotors and bearings, ensuring long-term stable operation of the air pump under high-pressure conditions. Attached Figure Description

[0019] Figure 1 A perspective view of the present invention is shown;

[0020] Figure 2 A front view of the present invention is shown;

[0021] Figure 3 A side view of the present invention is shown;

[0022] Figure 4 A perspective view of the lower housing of this utility model is shown;

[0023] Figure 5 A perspective view of the rotor and rotating rod of this utility model is shown.

[0024] Legend:

[0025] 10. Upper housing; 101. Input pipe; 11. Lower housing; 111. Output pipe; 12. Fixing bolt; 13. Rotor; 131. Restriction groove; 14. Rotating rod; 141. Restriction block; 15. Synchronous gear; 16. First conveying channel; 17. Second conveying channel; 18. Cooling channel; 19. Main cooler. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-5 This utility model provides a technical solution: a multi-stage Roots high-pressure air pump, including an upper housing 10 and a lower housing 11. The upper housing 10 and the lower housing 11 are fixedly connected by a number of high-strength fixing bolts 12, forming a sealed, high-pressure resistant pump assembly. The pump assembly is internally divided into three independent chambers connected in series along the gas flow direction through casting and machining. These are the first-stage pressurization chamber, the second-stage pressurization chamber, and the third-stage pressurization chamber.

[0028] An integrally formed gas input pipe 101 is provided at the top of the upper housing 10, that is, at the beginning of the first-stage pressurization chamber, and an integrally formed gas output pipe 111 is provided at the bottom of the lower housing 11, that is, at the end of the third-stage pressurization chamber.

[0029] Each independent chamber is equipped with two rotors 13 that rotate in coordination. Depending on the different flow and pressure requirements, the blade shape of the rotor 13 can be designed as two-bladed, three-bladed, or four-bladed. The three-bladed rotor is preferred in this embodiment because of its smooth operation and small airflow pulsation. The rotor 13 is made of high-strength, heat-resistant, and deformation-resistant alloy materials, such as ductile iron or special aluminum alloy, to withstand the high temperature and high pressure brought by multi-stage pressurization.

[0030] Each rotor 13 has a circular hole running through its central axis. Several limiting grooves 131 are evenly distributed circumferentially on the inner wall of the circular hole. Correspondingly, at least two parallel rotating rods 14 pass through the upper housing 10 and the lower housing 11 and pass through all rotors 13.

[0031] The rotating rod 14 is supported by a bearing (not shown in the figure) set on the housing to ensure its smooth rotation and coaxiality. In the part of the rotating rod 14 located in the center hole of the rotor 13, a limiting block 141 that cooperates with the limiting groove 131 is fixedly welded to its outer ring. When the rotating rod 14 rotates, the torque is transmitted to the rotor 13 through the meshing of the limiting block 141 and the limiting groove 131, driving it to rotate synchronously.

[0032] In order to enable the two rotors 13 in each chamber to rotate synchronously in opposite directions and to keep a small gap between the blades without contacting each other, in an independent gearbox (not shown) at one end of the pump body, the outer rings of the two rotating rods 14 are respectively fixedly fitted with intermeshing synchronous gears 15.

[0033] The teeth of the synchronizing gear 15 are ground with high precision to ensure that there is no backlash in the transmission, which is the key to realizing the oil-free and contactless operation of the Roots pump.

[0034] Inside the upper housing 10 and the lower housing 11, there is an integrally cast conveying channel for connecting two adjacent chambers. Specifically, the bottom of the first-stage pressurization chamber is connected to the top of the second-stage pressurization chamber through the first conveying channel 16; the bottom of the second-stage pressurization chamber is connected to the top of the third-stage pressurization chamber through the second conveying channel 17.

[0035] During operation, external air enters the top of the first-stage pressurization chamber through the input pipe 101. The two rotors 13 in the chamber rotate in opposite directions at high speed, continuously transporting gas from the top to the bottom of the chamber. At the bottom outlet, due to the pressure difference with the subsequent channel, the gas is initially compressed, the pressure increases, and the temperature also increases significantly due to the heat of compression.

[0036] High-temperature and high-pressure gas enters the first conveying channel 16 from the bottom of the first-stage chamber. The gas then enters the top of the second-stage pressurization chamber from the first conveying channel 16. The rotor 13 of the second stage pressurizes the gas a second time in the same manner, further increasing its pressure and temperature. The high-temperature and high-pressure gas that has completed the second pressurization enters the second conveying channel 17 from the bottom of the second-stage chamber. The gas then enters the top of the third-stage pressurization chamber for a third pressurization. Finally, the high-pressure gas that has reached the target pressure is discharged from the bottom of the third-stage chamber through the output pipe 111.

[0037] Cooling channels 18 are provided in the upper housing 10 and the lower housing 11 on both sides of the first conveying channel 16 and the second conveying channel 17. When high-temperature gas flows through the conveying channel, its heat is conducted through the channel wall to the cooling channels 18 on both sides and carried away by the internal flowing coolant, such as cooling water or cooling oil. The cooling channels 18 ensure that the gas is effectively cooled before being conveyed to the next stage.

[0038] To achieve efficient cooling, a main cooler 19, such as a finned air-cooled radiator or a water-cooled heat exchanger, is integrated on the top wall of the upper shell 10. All cooling channels 18 inside the shell are connected to the main cooler 19 through pipes to form a complete closed-loop cooling system.

[0039] The coolant is driven by a circulating pump and flows out of the main cooler 19 into the cooling channel 18 inside the housing to absorb heat. The heated coolant then returns to the main cooler 19 to dissipate heat and cool down. This cycle repeats continuously. Several cooling channels 18 on both sides of the delivery channel form two independent channels to ensure that the coolant can flow through every heat exchange area.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-stage Roots high-pressure air pump, characterized in that: The pump assembly includes an upper housing (10) and a lower housing (11) fixed by fixing bolts (12), and the pump assembly is internally divided into a first-stage pressurization chamber, a second-stage pressurization chamber and a third-stage pressurization chamber; Each pressurization chamber is provided with two rotors (13) that rotate in coordination with each other. The pump assembly is provided with a rotating rod (14) that passes through the rotor (13) and is used to drive the rotor (13) to rotate. The pump assembly is provided with a conveying channel connecting adjacent boosting chambers. The conveying channel includes a first conveying channel (16) connecting the bottom of the first-stage boosting chamber and the top of the second-stage boosting chamber, and a second conveying channel (17) connecting the bottom of the second-stage boosting chamber and the top of the third-stage boosting chamber. The pump assembly is provided with a cooling channel (18) for cooling the gas in the delivery channel, and the pump assembly is provided with a main cooler (19) connected to the cooling channel (18).

2. The multi-stage Roots high-pressure air pump according to claim 1, characterized in that: The upper housing (10) is provided with a gas input pipe (101) at the top, which is connected to the first-stage pressurization chamber, and the lower housing (11) is provided with a gas output pipe (111) at the bottom, which is connected to the third-stage pressurization chamber.

3. A multi-stage Roots high-pressure air pump according to claim 1, characterized in that: The cooling channels (18) are respectively located on both sides of the first conveying channel (16) and the second conveying channel (17).

4. A multi-stage Roots high-pressure air pump according to claim 1, characterized in that: The main cooler (19) is integrated into the top wall of the upper shell (10), and the cooling channel (18) and the main cooler (19) constitute a closed-loop cooling system.

5. A multi-stage Roots high-pressure air pump according to claim 1, characterized in that: It also includes a synchronizing gear (15) located at the end of the rotating rod (14), and the synchronizing gears (15) on the two rotating rods (14) mesh with each other.

6. A multi-stage Roots high-pressure air pump according to claim 1, characterized in that: The inner wall of the central hole of the rotor (13) is evenly distributed with several limiting grooves (131) along the circumference, and the outer ring of the rotating rod (14) located in the central hole is fixed with a limiting block (141) that cooperates with the limiting grooves (131).

7. A multi-stage Roots high-pressure air pump according to claim 1, characterized in that: The rotor (13) has a two-lobe, three-lobe, or four-lobe blade.

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