A multi-stage gas booster pump

Abstract

The present invention provides a multi-stage gas booster pump, including a pump body, wherein two or more booster chambers are arranged in the pump body, each booster chamber is connected head to tail in sequence and the volume of each booster chamber gradually decreases from the head end to the tail end, and the pump body is provided with an air inlet connected to the booster chamber at the head end and an air outlet connected to the booster chamber at the tail end; each booster chamber is respectively provided with an impeller, and the pump body is provided with a driving device, and the driving device is used to drive each impeller to rotate so that the gas in each booster chamber flows from the head end to the tail end. The booster pump can boost the gas step by step, can effectively maintain the stability of the gas flow direction, reduce the gas backflow and the mutual interference of the gas flow, thereby effectively improving the boosting effect on the gas and can continuously and stably maintain the supply of high-pressure gas, without the need to add an additional gas storage device, can effectively simplify the equipment structure, reduce the equipment volume, and has a wider range of applications.

Description

Technical Field

[0001] The invention belongs to the field of gas boosting equipment, and more specifically, relates to a gas boosting pump. Background Art

[0002] In various places such as medical treatment, industry, and testing, it is often necessary to pressurize gas to meet usage requirements. For example, in the hydrogen circulation system of hydrogen fuel vehicles, hydrogen needs to be pressurized to a predetermined pressure for use. Existing gas superchargers usually achieve gas pressurization by mechanical compression in a sealable container. The gas pressurization effect is limited, and it is usually impossible to continuously pressurize the gas, and it is impossible to ensure the continuous supply of stable high-pressure gas. It is also often necessary to use it with a high-pressure gas storage container. The structure is complex and the volume is large, which makes it difficult to meet the application requirements of hydrogen fuel vehicles and other fields. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a multi-stage gas booster pump capable of improving the boosting effect and maintaining continuous supply of high-pressure gas.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A multi-stage gas booster pump is provided, comprising a pump body, wherein two or more booster chambers are arranged in the pump body, the booster chambers are connected in sequence from head to tail, and the volume of each booster chamber gradually decreases from the head end to the tail end, and the pump body is provided with an air inlet connected to the booster chamber at the head end and an air outlet connected to the booster chamber at the tail end;

[0006] An impeller is respectively arranged in each of the boosting chambers, and a driving device is arranged on the pump body. The driving device is used to drive each of the impellers to rotate so that the gas in each of the boosting chambers flows from the head end to the tail end.

[0007] Preferably, the impeller is a centrifugal closed impeller, comprising a front cover plate, a rear cover plate and blades arranged between the front cover plate and the rear cover plate, a first air inlet is arranged in the middle of the front cover plate, and a first air outlet is arranged at a side end of the impeller;

[0008] A first vent is provided in the middle of the head end wall of each of the boost chambers, and a second vent is provided on the tail end wall, and each of the two adjacent boost chambers is connected through the first vent of one boost chamber and the second vent of the other boost chamber; the air inlet is connected to the first vent of the boost chamber at the head end, and the air outlet is connected to the second vent of the boost chamber at the tail end;

[0009] The front cover plate of each impeller is close to the inner wall of the front end of the boost chamber where the impeller is located, and the first air inlet of each impeller is aligned with and communicated with the first vent of the boost chamber where the impeller is located.

[0010] Preferably, the front cover plate and the rear cover plate are both in the shape of circular plates, and the diameter of the front cover plate of each impeller is larger than the diameter of the rear cover plate; the boost chamber is a disc-shaped cavity, and the outer edge of the front cover plate is close to the inner wall of the boost chamber.

[0011] Preferably, the central axis of each of the boost chambers is collinear with a main axis and the boost chambers are distributed in sequence along the main axis, and the central axis of each of the impellers is collinear with the main axis.

[0012] Preferably, the driving device includes a driver and a driving shaft connected to the driver, the central axis of the driving shaft is colinear with the main axis, and each of the impellers is connected to the driving shaft and can rotate with the driving shaft.

[0013] Preferably, at least one of the boost chambers is provided with a boost component, which is located between the tail end of the impeller and the tail inner wall of the boost chamber, and the head end face of the boost component is close to the tail end face of the impeller, and the tail end face of the boost component is close to or close to the tail inner wall of the boost chamber; the side end of the boost component is provided with a second air inlet, and the tail end is provided with a second air outlet that is aligned with and connected to the second air outlet, and the boost component is provided with a boost channel that connects the second air inlet and the second air outlet; along the direction from the second air inlet to the second air outlet, the cross-sectional area of ​​the boost channel gradually decreases.

[0014] Preferably, the number of the boost chambers is four.

[0015] Preferably, an air inlet cavity is provided on the pump body, the air inlet is connected with the boosting cavity at the front end via the air inlet cavity, and a heating device for heating the gas in the air inlet cavity is provided on the pump body.

[0016] Preferably, it also includes a base, the pump body and the driving device are both arranged on the base, the base is provided with a receiving groove for accommodating electronic components and an openable bottom cover for closing the receiving groove, and a heat insulating member is arranged between the pump body and the base, and the heat insulating member separates the pump body and the base by a distance.

[0017] Preferably, the pump body is provided with a pressure detection device for directly or indirectly detecting the gas pressure in the air inlet; and also includes a control device, which can control the output power of the driving device according to the detection result of the pressure detection device.

[0018] The beneficial effects of the present invention are as follows: when the boost pump is in use, the driving device can drive the impellers to rotate, so that the gas entering from the air inlet passes through the boost chambers in sequence and is then transported out from the air outlet. Since the volume of each boost chamber decreases in sequence from the head end to the tail end, the gas can be pressurized step by step. Moreover, since the boost chambers are independent of each other, the stability of the airflow direction can be effectively maintained, and the backflow of the gas and the mutual interference of the airflow can be reduced. Therefore, the pressurization effect of the gas can be effectively improved and the supply of high-pressure gas can be continuously and stably maintained. There is no need to add an additional gas storage device, which can effectively simplify the equipment structure, reduce the equipment volume, and has a wider range of applications. It is particularly suitable for use in hydrogen circulation systems of hydrogen energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is an overall structural diagram of a preferred embodiment of the present invention after the bottom cover is opened;

[0021] Figure 2 It is a schematic cross-sectional view of a preferred embodiment of the present invention;

[0022] Figure 3 It is a decomposition structure diagram of a preferred embodiment of the present invention;

[0023] Figure 4 It is a structural diagram of an impeller in a preferred embodiment of the present invention;

[0024] Figure 5 It is a structural diagram of a pressurizing member in a preferred embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the structure of the air guide plate in the preferred embodiment of the present invention.

[0026] Among them, the reference numerals in the figure are:

[0027] Pump body 10; boost chamber 11; air inlet 12; air outlet 13; partition 14; ventilation hole 15; air inlet chamber 16; main body 171; cover 172; shell 173; guide bracket 174; bearing 175; sealing ring 176; air outlet chamber 18; impeller 20; front cover plate 21; rear cover plate 22; blades 23; first air inlet 24; first air outlet 25; drive device 30; driver 31; drive shaft 32; boost component 40; second air inlet 41; second air outlet 42; boost channel 43; substrate 44; guide plate 45; heating device 50; base 60; receiving groove 61; bottom cover 62; thermal insulation component 63; pressure detection device 70; air guide plate 80; bottom plate 81; air guide platform 82; air guide surface 83. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] Reference Figures 1 to 6 According to a preferred embodiment of the present invention, there is provided a multi-stage gas booster pump, including a pump body 10, wherein two or more booster chambers 11 are arranged in the pump body 10, wherein the booster chambers 11 are connected in sequence from the beginning to the end and the volume of each booster chamber 11 gradually decreases from the head end to the tail end, and the pump body 10 is provided with an air inlet 12 connected with the booster chamber 11 at the head end and an air outlet 13 connected with the booster chamber 11 at the tail end; an impeller 20 is arranged in each booster chamber 11, and a driving device 30 is arranged on the pump body 10, and the driving device 30 is used to drive each impeller 20 to rotate so that the gas in each booster chamber 11 flows from the head end to the tail end. When the boost pump is in use, the driving device 30 can drive the impellers 20 to rotate, so that the gas entering from the air inlet 12 passes through the boost chambers 11 in sequence and is then delivered from the air outlet 13. Since the volume of each boost chamber 11 decreases from the head end to the tail end, the gas can be pressurized step by step. Moreover, since the boost chambers 11 are independent of each other, the stability of the airflow direction can be effectively maintained, the backflow of the gas and the mutual interference of the airflow can be reduced, the boosting effect of the gas can be effectively improved, and the supply of high-pressure gas can be continuously and stably maintained without the need for additional gas storage devices. The equipment structure can be effectively simplified, the equipment volume can be reduced, and the scope of application is wider. It is particularly suitable for use in hydrogen circulation systems of hydrogen energy vehicles.

[0030] The "head end" and "tail end" in the present invention are set according to the preset direction of the airflow. The direction from the head end to the tail end corresponds to the overall forward direction of the airflow in the booster pump, and is not limited to a linear direction.

[0031] As a preferred embodiment of the present invention, it may also have the following additional technical features:

[0032] Reference Figure 4 In the present embodiment, the impeller 20 adopts a centrifugal closed impeller 20, including a front cover plate 21, a rear cover plate 22 and a blade 23 arranged between the front cover plate 21 and the rear cover plate 22, a first air inlet 24 is arranged in the middle of the front cover plate 21, and a first air outlet 25 is arranged at the side end of the impeller 20; a first vent is arranged in the middle of the head end wall of each boosting chamber 11, and a second vent is arranged on the tail end wall, and each two adjacent boosting chambers 11 are connected through the first vent of one boosting chamber 11 and the second vent of the other boosting chamber 11; the air inlet 12 is connected with the first vent of the boosting chamber 11 at the head end, and the air outlet 13 is connected with the second vent of the boosting chamber 11 at the tail end; the front cover plate 21 of each impeller 20 is close to the head end inner wall of the boosting chamber 11 where the impeller 20 is located, and the first air inlet 24 of each impeller 20 is aligned and connected with the first vent of the boosting chamber 11 where it is located. The centrifugal closed impeller 20 is widely used. It can inhale gas from the first air inlet 24, pressurize the gas by centrifugal force during rotation, and then discharge the pressurized gas through the first air outlet 25. The closed structure formed by the front cover plate 21 and the rear cover plate 22 can effectively prevent gas backflow and mutual interference of airflow. The front cover plate 21 is close to the inner wall of the head end of the boost chamber 11, which can also reduce the gap between the impeller 20 and the inner wall of the head end of the boost chamber 11, thereby further preventing gas backflow, thereby effectively improving the pressurization effect on the gas, and is also convenient for installation and use. In other embodiments, the impeller 20 can also adopt other suitable impeller 20 structures such as a semi-closed impeller 20 as needed, and the setting position of the impeller 20 is not limited to being close to the inner wall of the head end of the boost chamber 11. For example, the impeller 20 can be set at other positions such as the middle and tail of the boost chamber 11. Those skilled in the art can flexibly select and adjust according to needs, and are not limited to this.

[0033] In this embodiment, the front cover plate 21 and the rear cover plate 22 are both in the shape of a circular plate, and the diameter of the front cover plate 21 of each impeller 20 is greater than the diameter of the rear cover plate 22; the boost chamber 11 is a disc-shaped cavity, and the outer edge of the front cover plate 21 is close to the inner wall of the boost chamber 11. This structure can further prevent the gas discharged from the first air outlet 25 from the gap between the front cover plate 21 and the inner wall of the boost chamber 11 to flow back to the first air inlet 24 and then enter the previous boost chamber 11, which can further reduce the reflux and interference of the gas, improve the guiding effect of the airflow, thereby improving the boosting effect, and is also convenient for processing and manufacturing. In other embodiments, the shape of the impeller 20 and the boost chamber 11 can also be flexibly adjusted as needed, for example, the boost chamber 11 can also adopt other shapes such as conical, square, etc., but is not limited to this. In addition, in this embodiment, the inner wall surface of the boost chamber 11 aligned with the side end of the impeller 20 gradually shrinks from the head end to the tail end, thereby further improving the guiding effect of the airflow.

[0034] The central axis of each boost chamber 11 is collinear with a main axis and each boost chamber 11 is sequentially distributed along the main axis, and the central axis of each impeller 20 is collinear with the main axis, so that the airflow can maintain a stable flow in an "S" shape, and is not prone to backflow and mutual interference, which helps to further improve the boosting effect and facilitates the processing and assembly of the boost pump. In other embodiments, each boost chamber 11 and impeller 20 can also be staggered or tilted at an angle, for example, they can be distributed in an arc shape, staggered distribution, etc., and those skilled in the art can flexibly adjust according to needs, and are not limited to this.

[0035] In this embodiment, each of the two adjacent boost chambers 11 is separated by a partition 14, and a vent 15 is provided in the middle of the partition 14. The second vent of the boost chamber 11 in front of the partition 14 and the first vent of the boost chamber 11 behind the boost chamber 11 are the openings at both ends of the vent 15. This structure can reduce the distance that the gas flows from the previous boost chamber 11 to the next boost chamber 11, can reduce the turbulence and attenuation of the air flow, help to improve the boosting effect, and also help to simplify the structure of the boost pump and reduce the volume of the boost pump, so as to facilitate manufacturing and use. In other embodiments, each boost chamber 11 can also be surrounded by a separate shell, and the distance between two adjacent boost chambers 11 can also be flexibly adjusted as needed.

[0036] Reference Figure 2 and Figure 3In the present embodiment, the driving device 30 comprises a driver 31 and a driving shaft 32 connected to the driver 31, the central axis of the driving shaft 32 is colinear with the main axis, and each impeller 20 is connected to the driving shaft 32 and can rotate with the driving shaft 32, so that only one driver 31 is used to drive each impeller 20 to rotate at the same time, which helps to simplify the structure of the booster pump and reduce the cost of the booster pump. In the present embodiment, the driver 31 adopts a motor, the driving shaft 32 is directly connected to the output shaft of the motor, and each impeller 20 is also directly mounted on the driving shaft 32, the structure is simple and reliable, and it is easy to assemble and use. In other embodiments, the driving device 30 may also include a plurality of drivers 31 to drive each impeller 20 to rotate respectively, and the driver 31 may also be connected to and driven by each impeller 20 through a transmission structure such as a gear or a belt, and the driver 31 may also adopt other commonly used driving structures such as an air pump, but is not limited thereto.

[0037] In addition, in the present embodiment, the drive shaft 32 is arranged through the middle of each of the first vents and the second vents, thereby forming an effective annular passage in the first vents and the second vents, so that the airflows flowing in and out from all around the drive shaft 32 are less likely to interfere with each other, which helps to improve the boost effect.

[0038] Reference Figure 2 , Figure 3 and Figure 5In this embodiment, a boost component 40 is provided in the boost chamber 11, and the boost component 40 is located between the tail end of the impeller 20 and the inner wall of the tail end of the boost chamber 11, and the head end face of the boost component 40 is close to the tail end face of the impeller 20, and the tail end face of the boost component 40 is close to or close to the inner wall of the tail end of the boost chamber 11; a second air inlet 41 is provided at the side end of the boost component 40, and a second air outlet 42 aligned with and connected to the second air outlet is provided at the tail end, and a boost channel 43 connecting the second air inlet 41 and the second air outlet 42 is provided in the boost component 40; along the direction from the second air inlet 41 to the second air outlet 42, the cross-sectional area of ​​the boost channel 43 gradually decreases. On the one hand, the supercharger 40 can further guide the direction of the airflow, reduce the backflow and mutual interference of the airflow, so that the gas can flow from the first vent and the second vent to the next supercharged chamber 11 in a predetermined direction, and can reduce the backflow of the gas from the gap between the supercharger 40 and the inner wall of the supercharged chamber 11, and between the supercharger 40 and the impeller 20. On the other hand, its tapered supercharged channel 43 can also further supercharge the gas, thereby effectively improving the supercharged effect of the gas. In this embodiment, the supercharger 40 is also disc-shaped, and its diameter is slightly smaller than the diameter of the rear cover plate 22 of the corresponding impeller 20, which can prevent interference with the airflow discharged from the impeller 20. In addition, in this embodiment, the supercharger 40 is separately formed and then fixed on the inner wall of the tail end of the supercharged chamber 11, which is convenient for processing and assembly. In the gas embodiment, the booster 40 may also be in any other suitable shape such as square, hexagonal, etc. It may also be directly integrally formed on the inner wall of the rear end of the booster chamber 11 or fixed or positioned by a gas suitable structure, but is not limited thereto.

[0039] The supercharger 40 in this embodiment includes a base plate 44 and an arc-shaped guide plate 45 disposed on the base plate 44, and a supercharge channel 43 is formed between each two adjacent guide plates 45, and the structure is simple and convenient for processing and assembly. In other embodiments, the supercharger 40 may also adopt other suitable structures, such as a structure in which a supercharge channel 43 is provided on a solid block, or the base plate 44 is removed and each guide plate 45 is connected by a central ring, etc., but it is not limited thereto. In addition, in this embodiment, the superchargers 40 are all disposed in the first three supercharger chambers 11. In other embodiments, the superchargers 40 may be disposed only in some of the supercharger chambers 11, or the superchargers 40 may be disposed in all of the supercharger chambers 11.

[0040] Reference Figure 2 , Figure 3 and Figure 6In this embodiment, since the rear end wall of the most tail-end supercharging chamber 11 needs to be passed through by the drive shaft 32 and supported and sealed, the second vents of the most tail-end supercharging chamber 11 are multiple and surround the outside of the drive shaft 32, and a corresponding air guide plate 80 with a structure similar to that of the supercharging component 40 is used to guide the air. The air guide plate 80 includes a bottom plate 81 and a plurality of air guide platforms 82 arranged on the bottom plate 81. The air guide platforms 82 are exposed to the side of the bottom plate 81, and an arc-shaped air guide surface 83 is arranged on the air guide platform 82, so that the air flow can be guided to each second vent. The air guide plate 80 is similar to the supercharging component 40 in shape and function, but it is adjusted accordingly to adapt to the smaller space at the tail end and the position of the second vent. In some embodiments, for example, when the second vent at the most tail end is arranged in the middle of the tail end wall of the most tail-end supercharging chamber 11, the air guide plate 80 can also be directly replaced by the supercharging component 40.

[0041] In this embodiment, the number of the boost chambers 11 is four, which can take into account both the volume requirement and the boost effect, and is suitable for use on most of the current hydrogen fuel vehicles. In other embodiments, the number of the boost chambers 11 can also be two, three, five, etc., and technical personnel in this field can flexibly adjust and select them according to needs, and are not limited to this. Its application is not limited to the boosting of hydrogen and hydrogen fuel vehicles, and can also be used in other applications to boost other gases such as air and carbon dioxide.

[0042] Reference Figure 1 and Figure 2 The pump body 10 is provided with an air inlet cavity 16, and the air inlet 12 is connected to the boosting cavity 11 at the front end via the air inlet cavity 16. The pump body 10 is provided with a heating device 50 for heating the gas in the air inlet cavity 16. When the gas temperature is too low, it will affect the boosting effect. The heating device 50 in this embodiment can heat the gas, thereby further improving the boosting effect. In this embodiment, the heating device 50 adopts an electric heating plate, and it is arranged on the outer wall of the pump body 10. The pump body 10 is used to transfer heat to the air inlet cavity 16, which can prevent the heating device 50 from being corroded by the gas or igniting the gas, which is safer and more reliable, and is also convenient for maintenance. In other embodiments, the heating device 50 can also adopt other heating structures such as electric heating wires, electric heating rods, and heat exchangers, and its installation position can also be other suitable positions such as in the air inlet cavity 16. Those skilled in the art can flexibly adjust it according to needs.

[0043] Reference Figure 1, this embodiment also includes a base 60, the pump body 10 and the driving device 30 are both arranged on the base 60, the base 60 is provided with a receiving groove 61 for accommodating electronic components and an openable bottom cover 62 for closing the receiving groove 61, and a heat insulating member 63 is arranged between the pump body 10 and the base 60, and the heat insulating member 63 separates the pump body 10 from the base 60 by a distance. The receiving groove 61 can facilitate the installation of electronic components such as the corresponding control circuit board, and because the heat insulating member 63 separates the pump body 10 from the base 60, the heat generated by the pump body 10 when working is not easily transferred to the base 60, so it is not easy to cause the electronic components to overheat and malfunction or damage, and it is convenient to use. In this embodiment, the heat insulating member 63 is a gasket arranged between the pump body 10 and the base 60, and its material can be selected from common heat insulating materials such as rubber and asbestos, and the air in the gap formed between the pump body 10 and the base 60 is used for heat insulation. The structure is simple, the cost is low, and it is easy to manufacture and assemble. In other embodiments, the thermal insulation member 63 may also adopt other commonly used thermal insulation structures such as thermal insulation pads, but is not limited thereto.

[0044] Reference Figure 1 The pump body 10 is provided with a pressure detection device 70 for directly or indirectly detecting the gas pressure in the air inlet 12; it also includes a control device, which can control the output power of the driving device 30 according to the detection result of the pressure detection device 70, thereby automatically adjusting the rotation speed of each impeller 20 according to the air inlet pressure, so as to keep the pressure of the output gas stable and easy to use. The pressure detection device 70 is widely used in this field, and a common detection structure such as a pressure sensor can be selected. It can be installed in the air inlet 12 to directly detect the air pressure in the air inlet 12, or it can be installed in the air inlet cavity 16 directly connected to the air inlet 12 to indirectly detect the air pressure in the air inlet 12. Those skilled in the art can flexibly adjust and select according to needs.

[0045] Reference Figures 1 to 3 In this embodiment, the pump body 10 includes a main body 171, a cover 172 and an outer shell 173 installed together. The main body 171 and the cover 172 together form a main volume, and a plurality of flow guide brackets 174 are sequentially installed in the main volume to form each boost chamber 11 and the air inlet chamber 16. The driver 31 is installed at the rear end of the pump body 10. The head end and the tail end of the drive shaft 32 are respectively installed on the cover 172 and the main body 171 through bearings 175, and both places are equipped with sealing rings 176 to prevent the gas in the main volume from corroding the bearing 175 and leaking. The shell of the driver 31 and the main body 171 together form an outlet chamber 18, and the outlet port 13 is connected to the second vent of the most tail end boost chamber 11 through the outlet chamber 18. This structure facilitates the manufacturing and overall assembly of each component. In other embodiments, the pump body 10 can also adopt other suitable assembly structures, but is not limited to this.

[0046] Under the premise that no conflict occurs, those skilled in the art may freely combine and superimpose the above-mentioned additional technical features.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage gas booster pump, characterized in that: The pump body comprises a pump body, wherein two or more boosting chambers are arranged in the pump body, the boosting chambers are connected in sequence from head to tail, and the volume of each boosting chamber gradually decreases from the head end to the tail end, and the pump body is provided with an air inlet connected to the boosting chamber at the head end and an air outlet connected to the boosting chamber at the tail end; Each boosting chamber is provided with an impeller, and the pump body is provided with a driving device, which is used to drive each impeller to rotate so that the gas in each boosting chamber flows from the head end to the tail end; The impeller is a centrifugal closed impeller, comprising a front cover plate, a rear cover plate and blades arranged between the front cover plate and the rear cover plate, a first air inlet is arranged in the middle of the front cover plate, and a first air outlet is arranged at the side end of the impeller; A first vent is provided in the middle of the head end wall of each boost chamber, and a second vent is provided on the tail end wall. Each of the two adjacent boost chambers is connected through the first vent of one boost chamber and the second vent of the other boost chamber; the air inlet is connected to the first vent of the head end boost chamber, and the air outlet is connected to the second vent of the tail end boost chamber; The front cover plate of each impeller is close to the inner wall of the front end of the boost chamber where the impeller is located, and the first air inlet of each impeller is aligned with and connected to the first vent of the boost chamber where the impeller is located; The front cover plate and the rear cover plate are both in the shape of circular plates, and the diameter of the front cover plate of each impeller is larger than the diameter of the rear cover plate; the boosting chamber is a disc-shaped cavity, and the outer edge of the front cover plate is close to the inner wall of the boosting chamber; A supercharging component is provided in at least one supercharging chamber, and the supercharging component is located between the tail end of the impeller and the tail end inner wall of the supercharging chamber, and the head end face of the supercharging component is close to the tail end face of the impeller, and the tail end face of the supercharging component is close to or close to the tail end inner wall of the supercharging chamber; a second air inlet is provided at the side end of the supercharging component, and a second air outlet aligned with and connected to the second air outlet is provided at the tail end, and a supercharging channel connecting the second air inlet and the second air outlet is provided in the supercharging component.

2. A multi-stage gas booster pump according to claim 1, characterized in that: The central axis of each boosting chamber is collinear with a main axis and the boosting chambers are distributed in sequence along the main axis. The central axis of each impeller is collinear with the main axis.

3. A multi-stage gas booster pump according to claim 2, characterized in that: The driving device comprises a driver and a driving shaft connected with the driver. The central axis of the driving shaft is colinear with the main axis. Each impeller is connected with the driving shaft and can rotate with the driving shaft.

4. A multi-stage gas booster pump according to claim 1, characterized in that: Along the direction from the second air inlet to the second air outlet, the cross-sectional area of ​​the boost passage gradually decreases.

5. A multi-stage gas booster pump according to any one of claims 1 to 4, characterized in that: Pressurized chamber The number is four.

6. A multi-stage gas booster pump according to any one of claims 1 to 4, characterized in that: On the pump body An air inlet cavity is provided, and an air inlet port is connected with the boosting cavity at the front end via the air inlet cavity. A heating device for heating the gas in the air inlet cavity is provided on the pump body.

7. A multi-stage gas booster pump according to any one of claims 1 to 4, characterized in that: It also includes a base, on which the pump body and the driving device are arranged. The base is provided with a receiving groove for accommodating electronic components and an openable bottom cover for closing the receiving groove. A heat insulating member is arranged between the pump body and the base, and the heat insulating member separates the pump body and the base by a distance.

8. A multi-stage gas booster pump according to any one of claims 1 to 4, characterized in that: The pump body is provided with a pressure detection device for directly or indirectly detecting the gas pressure in the air inlet; it also includes a control device, which can control the output power of the driving device according to the detection result of the pressure detection device.

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