Welding pump body device of stainless steel roots vacuum pump

Abstract

The utility model relates to a welded pump body device of a stainless steel roots vacuum pump, which comprises a front end face cover plate, a rear end face cover plate, a left semicircular pump shell and a right semicircular pump shell, the left semicircular pump shell and the right semicircular pump shell are both semicircular annular shells, the front end face cover plate is arranged at the front end of the left semicircular pump shell and the front end of the right semicircular pump shell, and the rear end face cover plate is arranged at the rear end of the left semicircular pump shell. A front end face cover plate is arranged at the front end of the left semicircular pump shell, a rear end face cover plate is arranged at the rear end of the right semicircular pump shell, the front end face cover plate and the rear end face cover plate are round end face cover plates with 8-shaped inner holes, and the front end and the rear end of the left semicircular pump shell and the front end and the rear end of the right semicircular pump shell are attached to the hole walls of the 8-shaped inner holes of the front end face cover plate and the rear end face cover plate respectively. And the welded pump body of the roots vacuum pump is formed. According to the utility model, the welded pump body is divided into various part units, so that the pump body has the advantages of high yield, attractive appearance, light weight, good heat dissipation, high strength, no internal stress, high overall precision, good part stability, difficulty in deformation and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of Roots vacuum pumps, in particular to a welded pump body device for a stainless steel Roots vacuum pump. Background Art

[0002] Roots vacuum pumps are increasingly widely used. Especially when Roots vacuum pumps are applied in the chemical industry, corrosion-resistant stainless steel materials need to be used to meet the anti-corrosion requirements of chemical processes. Due to the particularity of stainless steel materials, the pump body of a Roots vacuum pump is a relatively complex stainless steel component, and there are many difficulties in casting, heat treatment, finish machining, etc. Therefore, there are almost no stainless steel Roots vacuum pumps available in the domestic and foreign markets. The main materials of existing Roots vacuum pumps are realized by casting ordinary cast iron and then performing machining. However, ordinary cast iron is not resistant to chemical corrosion. To meet the corrosion resistance requirements of the chemical industry, the traditional method is to apply an anti-corrosion coating on the inner surface of the cast iron parts in contact with chemical gases in the Roots vacuum pump to meet the requirements of chemical corrosion processes. Due to technical limitations, the surface coating can generally only reach about 0.03 mm. Since the coating is relatively thin, the anti-corrosion coating of the Roots vacuum pump is prone to short-term failure phenomena such as coating disappearance, peeling, and corrosion when used in strongly corrosive working conditions, which affects the air extraction performance of the Roots vacuum pump. Moreover, uneven coating thickness will also affect the normal use of the Roots vacuum pump.

[0003] In order to completely solve the corrosion resistance problem of Roots vacuum pumps in chemical processes, using stainless steel to make Roots vacuum pumps instead of traditional products can achieve corrosion resistance. However, the difficulty of a stainless steel Roots vacuum pump lies in the manufacture of the pump body. The pump body is the most complex and the key part with the highest precision requirements on a Roots vacuum pump. Therefore, a welded pump body device for a Roots vacuum pump suitable for stainless steel materials is needed. Summary of the Invention

[0004] The purpose of the utility model is to overcome the above deficiencies and provide a welded pump body device for a stainless steel Roots vacuum pump to solve the corrosion resistance problem of Roots vacuum pumps in chemical processes.

[0005] The purpose of the utility model is achieved as follows:

[0006] A welded pump body device for a stainless steel Roots vacuum pump, which includes a front-end face cover plate, a rear-end face cover plate, a left semi-circular pump housing and a right semi-circular pump housing. The left semi-circular pump housing and the right semi-circular pump housing are both semi-circular ring-shaped housings. A front-end face cover plate is provided at the front ends of the left semi-circular pump housing and the right semi-circular pump housing. A rear-end face cover plate is provided at the rear ends of the left semi-circular pump housing and the right semi-circular pump housing. The front-end face cover plate and the rear-end face cover plate are both circular end face cover plates with an 8-shaped inner hole. The left semi-circular pump housing and the right semi-circular pump housing are arranged symmetrically left and right and their shapes match the 8-shaped inner hole of the end face cover plate. The front and rear ends of the left semi-circular pump housing and the right semi-circular pump housing are respectively attached to the inner hole walls of the 8-shaped inner holes of the front-end face cover plate and the rear-end face cover plate to form the welded pump body of the Roots vacuum pump;

[0007] A transverse reinforcing rib plate is provided on the outer wall axis of the left semi-circular pump housing. Similarly, a transverse reinforcing rib plate is provided on the outer wall axis of the right semi-circular pump housing. The two ends of the transverse reinforcing rib plate are respectively connected to the front-end face cover plate and the rear-end face cover plate to weld the left semi-circular pump housing, the right semi-circular pump housing and the front and rear two end face cover plates together;

[0008] A horizontally arranged air inlet chamber housing is provided above the left semi-circular pump housing and the right semi-circular pump housing. The bottom surface of the air inlet chamber housing is communicated with the left semi-circular pump housing and the right semi-circular pump housing. A circular air inlet is provided on the top surface of the air inlet chamber housing, and a trachea is vertically connected to this air inlet. An air inlet flange is provided on the top surface of the trachea. Thus, the trachea communicates with the air inlet chamber housing and the interiors of the left semi-circular pump housing and the right semi-circular pump housing to form an upper air suction cavity;

[0009] A horizontally arranged exhaust chamber housing is provided below the left semi-circular pump housing and the right semi-circular pump housing. The structure of the exhaust chamber housing is the same as that of the air inlet chamber housing and they are arranged symmetrically up and down. A circular exhaust port is provided on the bottom surface of the exhaust chamber housing, and a exhaust pipe is vertically connected to this air inlet. An exhaust flange is provided on the bottom surface of the exhaust pipe. Thus, the exhaust pipe communicates with the exhaust chamber housing and the interiors of the left semi-circular pump housing and the right semi-circular pump housing to form a lower exhaust cavity;

[0010] A plurality of parallel and evenly distributed arc-shaped reinforcing rib plates are provided on the outer walls of the left semi-circular pump housing and the right semi-circular pump housing. Front and rear two legs are respectively provided at the lower ends of the left semi-circular pump housing and the right semi-circular pump housing. The legs are distributed at the four corners of the bottom of the welded pump body for supporting the weight of the vacuum pump.

[0011] Furthermore, the air inlet chamber housing is of a U-shaped groove structure. The U-shaped groove opening of the air inlet chamber housing faces the left semi-circular pump housing and the right semi-circular pump housing. One side of its U-shaped groove opening is welded to the top surface of the left semi-circular pump housing, and the other side is welded to the top surface of the right semi-circular pump housing.

[0012] Further, the U-shaped notch of the exhaust cavity housing faces the left semi-circular pump housing and the right semi-circular pump housing, and one side of its U-shaped notch is welded to the bottom surface of the left semi-circular pump housing, and the other side is welded to the bottom surface of the right semi-circular pump housing.

[0013] Further, the arc-shaped reinforcing rib plate is a 1 / 4 circular stainless steel sheet.

[0014] Further, the inner arc of the arc-shaped reinforcing rib plate is closely welded to the outer wall of the pump housing, and the end face cover plate, the semi-circular pump housing, the intake and exhaust cavity housing and the transverse reinforcing rib are welded together respectively.

[0015] Further, the leg includes leg side plates, a leg rear cover plate and a leg bottom plate. A leg rear cover plate is vertically connected between two parallel leg side plates, and a leg bottom plate is arranged at the bottom of the leg side plates.

[0016] Further, the inner walls of the intake cavity housing and the exhaust cavity housing are provided with a plurality of parallel and evenly distributed inner cavity reinforcing ribs.

[0017] Further, an intake and exhaust reinforcing rib is connected between the intake pipe and the front and rear end face cover plates, and an intake and exhaust reinforcing rib is connected between the exhaust pipe and the front and rear end face cover plates.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] The present utility model provides a welded pump body device for a stainless steel Roots vacuum pump. The pump body as a whole is decomposed into 13 groups of part units. Each part is opened with a welding groove according to requirements and then welded and assembled. Compared with a cast pump body, the welded pump body of the present utility model has the advantages of high finished product rate, beautiful appearance, light weight, good heat dissipation, high strength, no internal stress, high overall precision, good part stability and not easy to deform. The external of the welded pump body of the present utility model is provided with transverse reinforcing ribs and arc-shaped reinforcing rib plates arranged alternately, and the internal is provided with inner cavity reinforcing ribs and intake and exhaust reinforcing ribs, which not only play a connecting role, but also can increase the compressive strength of the pump body. Due to the large pressure difference between the inner and outer cavities of the vacuum pump, the reinforcing ribs can increase the impact resistance of the pump body, and can also reduce the wall thickness of the pump shell and the weight of the pump body. In addition, the heat dissipation area of the pump body can be increased, and a certain temperature reduction effect on the pump body can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is one of the structural schematic diagrams of the present utility model.

[0021] Figure 2 is the second structural schematic diagram of the present utility model.

[0022] Figure 3 is the transverse sectional schematic diagram of the present utility model.

[0023] Figure 4 This is a schematic radial cross-sectional view of the present utility model.

[0024] Figure 5 This is the front view of the present utility model.

[0025] Among them:

[0026] Front-end face cover plate 1, rear-end face cover plate 2, left semi-circular pump housing 3, right semi-circular pump housing 4, intake pipe 5, intake flange 51, exhaust pipe 6, exhaust flange 61, intake cavity housing 7, exhaust cavity housing 8, support leg 9, support leg side plate 91, support leg rear cover plate 92, support leg bottom plate 93, arc-shaped reinforcing rib plate 10, transverse reinforcing rib plate 11, inner cavity reinforcing rib 12, intake and exhaust reinforcing rib 13. Specific implementation mode

[0027] To better understand the technical solution of the present utility model, the following will be described in detail with reference to relevant drawings. It should be understood that the following specific embodiments are not intended to limit the specific implementation modes of the technical solution of the present utility model, and they are only the implementation modes that the technical solution of the present utility model can adopt. It should be noted first that the expressions regarding the positional relationships of the components herein, such as component A is located above component B, are based on the relative positions of the components shown in the drawings and are not intended to limit the actual positional relationships of the components. Embodiment 1

[0028] See Figures 1 - 5 , Figure 1 A structural schematic diagram of the present utility model is drawn. As shown in the figure, a welded pump body device of a stainless steel Roots vacuum pump involved in the present utility model includes a front-end face cover plate 1, a rear-end face cover plate 2, a left semi-circular pump housing 3 and a right semi-circular pump housing 4. The left semi-circular pump housing 3 and the right semi-circular pump housing 4 are both semi-circular ring-shaped housings. A front-end face cover plate 1 is provided at the front ends of the left semi-circular pump housing 3 and the right semi-circular pump housing 4, and a rear-end face cover plate 2 is provided at the rear ends of the left semi-circular pump housing 3 and the right semi-circular pump housing 4. The front-end face cover plate 1 and the rear-end face cover plate 2 are both circular end face cover plates with an 8-shaped inner hole. The left semi-circular pump housing 3 and the right semi-circular pump housing 4 are arranged symmetrically left and right and their shapes match the 8-shaped inner hole of the end face cover plate. The front and rear ends of the left semi-circular pump housing 3 and the right semi-circular pump housing 4 are respectively attached to the hole walls of the 8-shaped inner hole of the front-end face cover plate 1 and the rear-end face cover plate 2 to form the welded pump body of the Roots vacuum pump.

[0029] A transverse reinforcing rib plate 11 is provided on the outer wall central axis of the left semi-circular pump housing 3, and a transverse reinforcing rib plate 11 is also provided on the outer wall central axis of the right semi-circular pump housing 4. The two ends of the transverse reinforcing rib plate 11 are respectively connected to the front-end face cover plate 1 and the rear-end face cover plate 2, welding the left semi-circular pump housing 3, the right semi-circular pump housing 4 and the front and rear end face cover plates together.

[0030] Above the left semi-circular pump housing 3 and the right semi-circular pump housing 4, there is a horizontally arranged air inlet chamber housing 7. The air inlet chamber housing 7 is of a U-shaped groove structure and is cold-pressed and formed from a stainless steel plate by an arc bending machine or a forming press. The U-shaped groove opening of the air inlet chamber housing 7 faces the left semi-circular pump housing 3 and the right semi-circular pump housing 4. One side of its U-shaped groove opening is welded to the top surface of the left semi-circular pump housing 3, and the other side is welded to the top surface of the right semi-circular pump housing 4. A circular air inlet is provided on the top surface of the air inlet chamber housing 7, and a vertical air inlet pipe 5 is connected to this air inlet. An air inlet flange 51 is provided on the top surface of the air inlet pipe 5 for air intake. Thus, the air inlet pipe 5 communicates with the air inlet chamber housing 7 and the interiors of the left semi-circular pump housing 3 and the right semi-circular pump housing 4 to form an upper air suction cavity.

[0031] Below the left semi-circular pump housing 3 and the right semi-circular pump housing 4, there is a horizontally arranged exhaust chamber housing 8. The structure of the exhaust chamber housing 8 is the same as that of the air inlet chamber housing 7 and is arranged symmetrically above and below with respect to the air inlet chamber housing 7. That is, the U-shaped groove opening of the exhaust chamber housing 8 faces the left semi-circular pump housing 3 and the right semi-circular pump housing 4. One side of its U-shaped groove opening is welded to the bottom surface of the left semi-circular pump housing 3, and the other side is welded to the bottom surface of the right semi-circular pump housing 4. A circular exhaust port is provided on the bottom surface of the exhaust chamber housing 8, and a vertical exhaust pipe 6 is connected to this exhaust port. An exhaust flange 61 is provided on the bottom surface of the exhaust pipe 6 for exhaust. Thus, the exhaust pipe 6 communicates with the exhaust chamber housing 8 and the interiors of the left semi-circular pump housing 3 and the right semi-circular pump housing 4 to form a lower exhaust cavity.

[0032] On the outer walls of the left semi-circular pump housing 3 and the right semi-circular pump housing 4, there are a plurality of parallel and evenly distributed arc-shaped reinforcing rib plates 10. The arc-shaped reinforcing rib plates 10 are 1 / 4 circular ring-shaped stainless steel plates. The inner arc of the arc-shaped reinforcing rib plates 10 is closely welded to the outer wall of the pump housing. Four groups of five columns of the above-mentioned arc-shaped reinforcing rib plates 10 are respectively arranged in the upper and lower parts of the transverse reinforcing rib 11, and the end face cover plate, the semi-circular pump housing, the air inlet and exhaust chamber housing, and the transverse reinforcing rib are welded together respectively.

[0033] At the lower ends of the left semi-circular pump housing 3 and the right semi-circular pump housing 4, there are respectively two front and rear legs 9. The legs 9 are distributed at the four corners of the bottom of the welded pump body and are used to support the weight of the vacuum pump. The leg 9 includes a leg side plate 91, a leg rear cover plate 92, and a leg bottom plate 93. A leg rear cover plate 92 is vertically connected between two parallel leg side plates 91, and a leg bottom plate 93 is provided at the bottom of the leg side plate 91.

[0034] On the inner walls of the air inlet chamber housing 7 and the exhaust chamber housing 8, there are a plurality of parallel and evenly distributed inner cavity reinforcing ribs 12.

[0035] Between the air inlet pipe 5 and the front and rear end face cover plates, there is an air inlet and exhaust reinforcing rib 13 for connection. Between the exhaust pipe 6 and the front and rear end face cover plates, there is also an air inlet and exhaust reinforcing rib 13 for connection.

[0036] The front-end face cover plate 1, the rear-end face cover plate 2, the left semi-circular pump housing 3, the right semi-circular pump housing 4, the intake pipe 5, the intake flange 51, the exhaust pipe 6, the exhaust flange 61, the intake cavity housing 7, the exhaust cavity housing 8, the legs 9, the leg side plates 91, the leg rear cover plates 92, the leg bottom plates 93, the arc-shaped reinforcing rib plates 10, the transverse reinforcing rib plates 11, the inner cavity reinforcing ribs 12, and the intake and exhaust reinforcing ribs 13 are all made of stainless steel and are all processed by a water jet cutting device, and are connected to each other by welding.

[0037] A welded pump body device of a stainless steel Roots vacuum pump involved in the present utility model, the welding method thereof includes the following contents:

[0038] Select appropriate welding materials: According to the use environment and performance requirements, select appropriate welding wire materials and ensure the matching of the welding materials with the base material. For example, 304 stainless steel is suitable for general environments, while 316 stainless steel has better corrosion resistance and is suitable for strongly corrosive chemical environments.

[0039] In order to ensure product quality, the surface of the stainless steel workpiece must be thoroughly cleaned before welding. The stainless steel surface is easily contaminated by grease, oxides, and other impurities, and these contaminants will cause weld defects during the welding process.

[0040] Preheating and temperature control: Although most stainless steels can be welded at room temperature, some thick plates or stainless steels with high carbon content need to be preheated during welding. Preheating can reduce welding stress and prevent crack formation. However, too high preheating temperature may cause intergranular corrosion and the formation of precipitates.

[0041] Welding process and parameter setting: Selecting appropriate welding processes and parameters is crucial for stainless steel welding. According to the structure of the Roots vacuum pump body, a gas shielded welding method of secondary welding is required, that is, first perform overall backing welding and then perform overall surfacing welding. Gas shielded welding has the advantages of fast welding speed, stable quality, and low cost, and is suitable for welding parts with a relatively high density distribution.

[0042] Shielding gas: For the welding area that needs to be protected, shielding gases such as argon and nitrogen should be used to prevent oxidation and nitridation. The purity and flow rate of the shielding gas should be adjusted according to the welding current and welding position.

[0043] Check the weld quality: After welding, the welds need to be inspected visually and by non-destructive testing to ensure the welding quality and safety. For welds with unqualified appearance, repair or rework is required.

[0044] Working principle:

[0045] Due to the large volume, numerous rib plates, and relatively complex shape and structure of the Roots vacuum pump body, when using stainless steel material, the qualified rate of the castings of the stainless steel Roots vacuum pump body is very low, which is not suitable for mass production. The fundamental reason is that during casting, due to the poor fluidity of the stainless steel molten metal, the stainless steel castings are prone to casting defects such as shrinkage cavities, missing corners, rough surfaces, internal air holes, and a large number of cracks. The qualified rate of the castings cannot be controlled, which affects the normal production of the product and greatly increases the manufacturing cost of the product. Therefore, the present utility model proposes a welded pump body device for a stainless steel Roots vacuum pump. By decomposing the welded pump body of the Roots vacuum pump into multiple part units, using the water jet cutting method to cut and process each unit according to the technical requirements of the drawing, and then obtaining a qualified corrosion-resistant stainless steel Roots vacuum pump body through the welding method. The strength of the stainless steel plate is higher than that of the stainless steel casting with the same thickness. Moreover, a number of reinforcing ribs are arranged vertically and horizontally on the outer surface of the pump body shell, and an air suction cavity is arranged inside the reinforcing ribs. The reinforcing ribs can ensure the strength of the stainless steel cavity, so that the wall thickness of all part units constituting the pump body can be appropriately thinned, thereby reducing the weight of the pump body and saving the material cost of the pump body. In addition to reducing the weight of the pump body, the reinforcing ribs can also dissipate the heat inside the pump cavity to the atmosphere through the heat exchange between the pump shell and the reinforcing ribs when the vacuum pump is working, thereby improving the heat dissipation performance of the pump body and solving the high-temperature phenomenon of the traditional Roots vacuum pump when working under high pressure difference.

[0046] Use the water jet cutting equipment to cut 13 groups of part units to the corresponding dimensions and shapes according to the design drawing, and then use the corresponding cutting and processing equipment to prepare the welding grooves according to the design drawing. To ensure the welding quality of the stainless steel pump body, it is recommended to adopt the gas shielded welding method, that is, use pure argon gas as the shielding gas. This method is suitable for the welding of various stainless steel materials, especially for the welding of parts with higher requirements for the weld quality.

[0047] The parts of the stainless steel gas shielded welding have the advantages of good stability, small thermal deformation, no internal stress, relatively good machinability of the parts, and small tool wear.

[0048] The specific welding procedure is to place one of the end covers on the welding platform and fasten it to the welding platform with 4 pressing plates. Then place the two pump shell rings on the end cover, measure the center distance between the two pump shell rings and their perpendicularity to the end cover with measuring tools. After meeting the technical requirements, clamp and fix the two pump shell rings with the tooling, and then use the gas shielded welding machine to spot weld the two half rings and the end cover at several points for a little fixation; then place the other end cover on the two pump shell rings, align and measure the horizontal left and right position dimensions, and then clamp it with the clamp. Then use the spot welding method to fix several points of the end cover and the two pump shell rings 2 by spot welding to complete the preliminary assembly of the pump shell.

[0049] Place the intake and exhaust flange on the welding platform and fix it with a pressing plate. Then place the intake and exhaust pipes into the flange positioning grooves. After measuring and ensuring that the perpendicularity between the pipe wall and the flange plane is qualified, fix it with spot welding. Then fix it with the intake and exhaust cavity shell according to the drawing with spot welding to complete the preliminary assembly of the intake and exhaust cavity.

[0050] Place the leg bottom plate on the welding platform and fix it appropriately. Then, respectively, spot weld the leg side plates, the leg side plates and the leg rear cover plates together to complete the preliminary assembly of the 4 legs.

[0051] After all the above steps are completed, enter the overall welding and assembly stage of the pump body. Use tooling fixtures to assemble the intake and exhaust cavity components, leg components, transverse reinforcing ribs, shell reinforcing ribs, inner cavity reinforcing ribs, etc. onto the pump body respectively.

[0052] Considering the accuracy requirements that need to be achieved after the pump body is welded, appropriate welding tooling must be matched and corresponding welding processes must be formulated. In order to reduce the overall weight of the pump body and reduce the machining allowance of parts, the wall thickness of the machined surface of the parts should be appropriately controlled. This places special requirements on the welding of parts. Traditional welding methods will cause deformation and dimensional errors of parts, and ultimately result in unnecessary part scrapping due to the lack of machining allowance in some local areas of the pump body.

[0053] The criss-cross arrangement of the reinforcing ribs on the pump body of the present utility model can, on the one hand, increase the compressive strength of the pump body. Since the pressure difference between the inner and outer cavities of the vacuum pump is large, the reinforcing ribs can increase the impact resistance of the pump body, and can also reduce the wall thickness of the pump shell and the weight of the pump body. In addition, it can increase the heat dissipation area of the pump body and play a certain role in cooling the pump body.

[0054] The above is only a specific application example of the present utility model and does not constitute any limitation to the protection scope of the present utility model. Any technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of the rights protection of the present utility model.

Claims

1. A welded pump body device for a stainless steel Roots vacuum pump, characterized in that: It includes a front end face cover plate (1), a rear end face cover plate (2), a left semi-circular pump housing (3) and a right semi-circular pump housing (4). The left semi-circular pump housing (3) and the right semi-circular pump housing (4) are both semi-circular ring-shaped housings. A front end face cover plate (1) is provided at the front ends of the left semi-circular pump housing (3) and the right semi-circular pump housing (4), and a rear end face cover plate (2) is provided at the rear ends of the left semi-circular pump housing (3) and the right semi-circular pump housing (4). The front end face cover plate (1) and the rear end face cover plate (2) are both circular end face cover plates with an 8-shaped inner hole. The left semi-circular pump housing (3) and the right semi-circular pump housing (4) are arranged symmetrically left and right and their shapes match the 8-shaped inner hole of the end face cover plate. The front and rear ends of the left semi-circular pump housing (3) and the right semi-circular pump housing (4) are respectively attached to the hole walls of the 8-shaped inner hole of the front end face cover plate (1) and the rear end face cover plate (2) to form a welded pump body of a Roots vacuum pump; A transverse reinforcing rib plate (11) is provided on the outer wall central axis of the left semi-circular pump housing (3), and a transverse reinforcing rib plate (11) is also provided on the outer wall central axis of the right semi-circular pump housing (4). The two ends of the transverse reinforcing rib plate (11) are respectively connected to the front end face cover plate (1) and the rear end face cover plate (2) to weld the left semi-circular pump housing (3), the right semi-circular pump housing (4) and the front and rear two end face cover plates together; An air inlet cavity housing (7) is provided above the left semi-circular pump housing (3) and the right semi-circular pump housing (4) and is arranged horizontally. The bottom surface of the air inlet cavity housing (7) is communicated with the left semi-circular pump housing (3) and the right semi-circular pump housing (4); a circular air inlet is provided on the top surface of the air inlet cavity housing (7), and a suction pipe (5) is vertically connected to this air inlet. An air inlet flange (51) is provided on the top surface of the suction pipe (5), and thus the suction pipe (5) communicates with the air inlet cavity housing (7) and the interiors of the left semi-circular pump housing (3) and the right semi-circular pump housing (4) to form an upper suction cavity; An exhaust cavity housing (8) is provided below the left semi-circular pump housing (3) and the right semi-circular pump housing (4) and is arranged horizontally. The structure of the exhaust cavity housing (8) is the same as that of the air inlet cavity housing (7) and is arranged symmetrically up and down with the air inlet cavity housing (7). A circular exhaust port is provided on the bottom surface of the exhaust cavity housing (8), and an exhaust pipe (6) is vertically connected to this air inlet. An exhaust flange (61) is provided on the bottom surface of the exhaust pipe (6), and thus the exhaust pipe (6) communicates with the exhaust cavity housing (8) and the interiors of the left semi-circular pump housing (3) and the right semi-circular pump housing (4) to form a lower exhaust cavity; A plurality of parallel and evenly distributed arc-shaped reinforcing rib plates (10) are provided on the outer walls of the left semi-circular pump housing (3) and the right semi-circular pump housing (4); front and rear two legs (9) are respectively provided at the lower ends of the left semi-circular pump housing (3) and the right semi-circular pump housing (4), and the legs (9) are distributed at the four corners of the bottom of the welded pump body to support the weight of the vacuum pump.

2. The welded pump body device of a stainless steel Roots vacuum pump according to claim 1, characterized in that: The intake cavity housing (7) is of a U-groove structure. The U-groove opening of the intake cavity housing (7) faces the left semi-circular pump housing (3) and the right semi-circular pump housing (4). One side of its U-groove opening is welded to the top surface of the left semi-circular pump housing (3), and the other side is welded to the top surface of the right semi-circular pump housing (4).

3. A welding pump body device of a stainless steel Roots vacuum pump according to claim 1, characterized in that: The U-groove opening of the exhaust cavity housing (8) faces the left semi-circular pump housing (3) and the right semi-circular pump housing (4). One side of its U-groove opening is welded to the bottom surface of the left semi-circular pump housing (3), and the other side is welded to the bottom surface of the right semi-circular pump housing (4).

4. A welding pump body device of a stainless steel Roots vacuum pump according to claim 1, characterized in that: The arc-shaped reinforcing rib plate (10) is a 1 / 4 circular stainless steel plate piece.

5. The welded pump body device of a stainless steel Roots vacuum pump according to claim 1, characterized in that: The inner arc of the arc-shaped reinforcing rib plate (10) is tightly welded to the outer wall of the pump housing, and the end face cover plate, the semi-circular pump housing, the intake and exhaust cavity housings and the transverse reinforcing ribs are welded together respectively.

6. The welded pump body device of a stainless steel Roots vacuum pump according to claim 1, characterized in that: The leg (9) includes leg side plates (91), a leg rear cover plate (92) and a leg bottom plate (93). The leg rear cover plate (92) is vertically connected between two parallel leg side plates (91), and the leg bottom plate (93) is arranged at the bottom of the leg side plates (91).

7. A welded pump body device of a stainless steel Roots vacuum pump according to claim 1, characterized in that: A plurality of parallel and evenly distributed inner cavity reinforcing ribs (12) are provided on the inner walls of the intake cavity housing (7) and the exhaust cavity housing (8).

8. A welded pump body device of a stainless steel Roots vacuum pump according to claim 1, characterized in that: An intake and exhaust reinforcing rib (13) is provided for connection between the intake pipe (5) and the front and rear end face cover plates, and an intake and exhaust reinforcing rib (13) is provided for connection between the exhaust pipe (6) and the front and rear end face cover plates.

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