Roots vacuum pump joint ring

Abstract

To provide a joining ring for a Roots vacuum pump, which can meet market demands for different specifications, achieve highly efficient production, and improve product quality. [Solution] A joining ring (100) for a Roots vacuum pump is attached to at least one end of a housing (2) of a Roots vacuum pump (1) and is used to expand the effective volume space of the housing (2). The joining ring (100) has a hollow annular structure and includes a frame (101) that fits the shape of the end of the housing (2). A front end flange (3) is formed at the front end of the frame (101), and a rear end flange (4) is formed at the rear end of the frame (101). A plurality of reinforcing ribs (21) are formed on the outer edge of the frame (101), and the plurality of reinforcing ribs (21) are located between both end faces of the front end flange (3) and the rear end flange (4). A plurality of recesses (2') are formed between each of the reinforcing ribs (21). The frame (101) further includes a cooling water chamber (6) located at the bottom.

Description

[Technical Field]

[0001] The present invention relates to a Roots vacuum pump, and more particularly to a connecting ring for a Roots vacuum pump. [Background technology]

[0002] Roots vacuum pumps are rotary variable-displacement vacuum pumps with no internal compression. They achieve a vacuum by rotating a pair of rotors in a pump chamber in counterclockwise directions to move gas. Because the gaps between the rotors and between the rotor and the pump casing are sealed, no oil seals or lubrication is required. Roots vacuum pumps boast fast suction speeds, high volumetric efficiency, high vacuum levels, low energy consumption, compact structure, stable operation, and high reliability. They are widely used in industries such as power generation, semiconductors, solar power generation, petrochemicals, food processing, and smelting. Summary of the Invention [Problem to be solved by the invention]

[0003] Because customer requirements for Roots vacuum pumps vary, such as suction capacity, extremely high vacuum, and installation methods, many Roots vacuum pumps are custom designed and manufactured without following standards. Customizing without following standards can better meet customer needs, but it also requires more manpower and resources for Roots vacuum pump designers and manufacturers.

[0004] The pump body is the basic component of a Roots vacuum pump. Because the pump body is cast as a single piece, the larger the pump body, the more difficult the casting process becomes. When considering performance, manufacturing, and cost, the larger the pump body, the lower the cost performance. With the same functionality and quality, cost is the key factor for designers and manufacturers to win in the market.

[0005] It is a contradiction for designers and manufacturers to provide high-quality, low-cost products while better meeting customer demands through customization rather than conforming to standards, and integrated modular manufacturing has been an effective solution to this contradiction. Integrated modular manufacturing has improved manufacturing flexibility and convenience for designers and manufacturers, while also shortening product research and development time, improving manufacturing efficiency, and reducing manufacturing costs.

[0006] In order to meet customer demands for low cost and high performance, manufacturers need to explore more integrated and modular manufacturing methods. This led the inventor to devise the Roots vacuum pump joining ring. This design shortens the pump body from its original long body design to a short pump body with a joining ring added, making the pump body easier to cast. The combination of the pump body and joining ring is truly an integrated and modular manufacturing method. The joining ring design prevents a series of problems caused by the pump body being too large. The flexible combination of joining rings and pump bodies allows designers and manufacturers to build on their current manufacturing capabilities and achieve faster, more efficient, higher quality, and lower prices, thereby better satisfying customer demand.

[0007] Therefore, the present inventors believed that the above drawbacks could be improved, and after extensive research, they came up with the present invention, which effectively improves the above issues through rational design.

[0008] The present invention was developed in response to the above-mentioned problems and was the result of extensive research by the present inventors. Its purpose is to provide a connecting ring for a Roots vacuum pump. This connecting ring increases the volume of the Roots vacuum pump, and different combinations of the Roots vacuum pump and connecting ring allow the production of products with different intake volumes and vacuum levels on the same platform, thereby satisfying market demand for products with different specifications and achieving integrated modular manufacturing. Integrated modular manufacturing allows companies to eliminate the need to purchase components, achieving more efficient lean manufacturing in many aspects, such as manufacturing and assembly, quality control, and cost containment, and improving product quality. [Means for solving the problem]

[0009] To achieve the above object, one embodiment of the present invention provides a joining ring for a Roots vacuum pump. The joining ring (100) is attached to at least one end of a housing (2) of a Roots vacuum pump (1). The joining ring (100) is used to expand the effective volume of the housing (2). The joining ring (100) has a hollow annular structure and a frame (101) whose shape matches the shape of the end of the housing (2). The frame (101) has a front flange (3) formed at its front end and a rear flange (4) formed at its rear end. A plurality of reinforcing ribs (21) are formed on the outer edge of the frame (101), and the reinforcing ribs (21) are located between both end faces of the front flange (3) and the rear flange (4). A plurality of recesses (2') are formed between each of the reinforcing ribs (21).

[0010] The joining ring for a Roots vacuum pump according to the present invention further includes a cooling water chamber (6) located at the bottom of the frame (101). A second O-shaped seal ring groove (7) for mounting a second O-shaped seal ring (71) is formed in a radial end surface of the cooling water chamber (6). A cooling water outlet (82) and a cooling water inlet (81) are formed in the front end surface (61) and the rear end surface (62) of the cooling water chamber (6), respectively.

[0011] When assembling, the rear flange 4 is joined to the end cover 200. A plurality of bolts are passed through bolt holes in the end cover 200, the rear flange 4 of the joining ring, and the front flange 3 of the joining ring, in that order, and are connected to a plurality of screw holes in the housing 2 of the Roots vacuum pump 1, thereby connecting the end cover 200, the joining ring 100, and the Roots vacuum pump 1 together to form a single unit.

[0012] Other objects, configurations and effects of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view of a connecting ring of a Roots vacuum pump according to an embodiment of the present invention; [Figure 2] 1 is a rear view of a connecting ring of a Roots vacuum pump according to an embodiment of the present invention; [Figure 3] 1 is a connection diagram of a connecting ring and a Roots vacuum pump according to the present invention; [Figure 4] 1 is a schematic diagram showing the connection between the joining ring and the first O-type seal ring groove according to the present invention; [Figure 5] 1 is a schematic diagram showing the connection between the joining ring and the end cover according to the present invention; [Figure 6] 1 shows an embodiment of a joining ring for a Roots vacuum pump according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following describes in detail the preferred embodiments of the present invention, but the present invention is not limited to these, and various modifications are possible within the scope of the description. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0015] Next, an example of a specific embodiment of the joining ring for a Roots vacuum pump according to the present invention will be described with reference to FIGS.

[0016] As shown in Figure 6, when assembling the Roots vacuum pump joint ring of the present invention, the joint ring (100) is attached to at least one end of the housing (2) of the Roots vacuum pump (1). The joint ring (100) is used to expand the effective volume space of the housing (2). One end of the housing (2) may be connected to the joint ring (100), or both ends of the housing (2) may be connected to one joint ring (100). The length of the joint ring (100) is the length of a series of products, and preferably the length of the joint ring (100) is 140 mm.

[0017] As shown in FIG. 1, the joining ring (100) includes the following components.

[0018] <Frame (101)> The frame (101) is a hollow annular structure, the shape of which matches the shape of the end of the housing (2).

[0019] A front flange 3 is formed at the front end of the frame 101. A plurality of bolt holes 31 are formed in the end surface of the front flange 3, and the front flange 3 is joined to the housing 2 of the Roots vacuum pump 1 (see FIG. 3). The inner diameter of the frame 101 is equal to the inner diameter of the housing 2, and preferably, the inner diameter R of the frame 101 is 220 mm.

[0020] A rear end flange 4 is formed at the rear end of the frame 101. A plurality of bolt holes 41 are formed in the end surface of the rear end flange 4. As shown in FIG. 4, a first O-shaped seal ring groove 5 for attaching a first O-shaped seal ring 51 is formed in the same end surface of the rear end flange 4 as the bolt holes 41. As shown in FIGS. 5 and 6, one end having the O-shaped seal ring groove 5 is joined to an end cover 200 to form a sealed structure.

[0021] A plurality of reinforcing ribs (21) are formed on the outer edge of the frame (101), and the plurality of reinforcing ribs (21) are located between both end faces of the front end flange (3) and the rear end flange (4). Each of the reinforcing ribs (21) is parallel to the axis of the frame (101). Preferably, the width of each of the reinforcing ribs (21) is 30 mm. A plurality of recesses (2') are formed between the front end flange (3), the rear end flange (4), and each of the reinforcing ribs (21). Preferably, the depth of each of the recesses (2') is 48 mm.

[0022] The recess (2') is used to reduce the weight of the joining ring (100), and the reinforcing rib (21) is used to enhance the function of the joining ring (100), and to increase the heat dissipation area of ​​the joining ring (100) through natural radiation or to enhance the convection air cooling capacity.

[0023] The cooling water chamber 6 is located at the bottom of the frame 101, and the front end surface 61 and the rear end surface 62 of the cooling water chamber 6 are flush with both end surfaces of the front end flange 3 and the rear end flange 4. The left and right end surfaces of the cooling water chamber 6 straddle the front end surface 61 and the rear end surface 62 of the cooling water chamber 6.

[0024] The bottom surface of the cooling water chamber 6 is formed with a second O-shaped seal ring groove 7 for mounting a second O-shaped seal ring 71. The front end surface 61 and the rear end surface 62 of the cooling water chamber 6 are formed with a cooling water outlet 82 and a cooling water inlet 81, respectively. When in use, cooling water is injected through the cooling water inlet 81 and circulated to the cooling water chamber 6, forcibly cooling the joining ring 100 and helping to lower the temperature of the Roots vacuum pump 1. When the bottom of the cooling water chamber 6 is covered with a seal plate 64, a completely sealed cooling water chamber is formed.

[0025] An upper inclined guide surface 9 and a lower inclined guide surface 10 are formed on the inner wall 103 of the frame 101. Preferably, the inclination angle of the upper inclined guide surface 9 and the lower inclined guide surface 10 relative to the inner wall 103 is 17.3°.

[0026] Two pump body inclined guide surfaces (not shown) are installed on both sides of the inlet and outlet ports of the internal chamber of the Roots vacuum pump 1, respectively, along the axial direction of the fan blades. The two pump body inclined guide surfaces are integrally connected to the corresponding upper and lower inclined guide surfaces 9 and 10. The upper inclined guide surfaces 9 guide gas from the inlet port of the Roots vacuum pump 1 to both ends of the fan blades along the axial direction of the fan blades of the pump body. The lower inclined guide surfaces 10 guide gas from the chamber of the Roots vacuum pump 1 along the axial direction of the fan blades to the outlet port of the Roots vacuum pump 1. In addition, cooling condensate formed during manufacturing flows along the lower inclined guide surfaces 10 to the outer surface of the outlet port, preventing it from concentrating and remaining inside the Roots vacuum pump 1.

[0027] When assembling, the rear flange (4) is joined to the end cover (200). As shown in Figure 5, multiple M16 long bolts (not shown) are passed through Φ18 bolt holes in the end cover (200), the rear flange (4) of the joint ring, and the front flange (3) of the joint ring, in that order, and connected to multiple M16 threaded holes in the housing (2) of the Roots vacuum pump (1). This connects the end cover (200), the joint ring (100), and the Roots vacuum pump (1) together into a single unit. If the joint ring (100) is not used, the end cover (200) is directly connected to the housing (2) of the Roots vacuum pump (1) with multiple M16 bolts.

[0028] The joint ring (100) and the housing (2), and the joint ring (100) and the end cover (200) are both positioned by two Φ16 cylindrical pins. When the joint ring (100) is not used, the housing (2) and the end cover (200) are also positioned by two Φ16 cylindrical pins. The joint ring (100) and the housing (2), the joint ring (100) and the end cover (200), and the Roots vacuum pump (1) and the end cover (200) are positioned by sliding combinations of Φ16 cylindrical pins and Φ16 pin holes, effectively ensuring the coaxiality and azimuth accuracy between the two connecting members.

[0029] The upper part of the frame 101 is provided with at least one screw hole 11 for hanging the joining ring 100, which facilitates the installation and removal of the joining ring 100. Preferably, the screw hole 11 is an M20 threaded hole, which is used to install a corresponding M20 screw (not shown).

[0030] When assembled, a pair of fan blade rotors are installed in the Roots vacuum pump (1) or in a chamber body surrounded by the combination of the Roots vacuum pump (1), the joining ring (100), and the end covers (200) on both ends, and together they complete the vacuum intake operation. Fan blade support bearings are installed in the end covers (200).

[0031] At least one pump leg 102 may be attached to the bottom of the frame 101, and at least one M16 screw hole is formed in the bottom of the frame 101. The M16 screw connects the frame 101 and the pump leg 102. The pump leg 102 is attached to the bottom of the frame 101, which allows for a wider range of installation options for the Roots vacuum pump 1, further meeting the demand for different installation positions, increasing installation flexibility and convenience, making the product more compact, and improving its aesthetics.

[0032] An O-shaped seal ring seals the gap between the end face of the housing 2 of the Roots vacuum pump 1 and the connecting ring 100. An O-shaped seal ring groove is provided on the end face (not shown) of the Roots vacuum pump 1. When the connecting ring 100 is not used, the end cover 200 is directly connected to the Roots vacuum pump 1, and the O-shaped seal ring seals the gap between the Roots vacuum pump 1 and the end cover 200. The O-shaped seal ring seal improves sealing efficiency and makes installation and removal easier.

[0033] This invention has the following advantages: The joining ring of the present invention expands the volume of the Roots vacuum pump, and different combinations of the Roots vacuum pump and joining ring allow products with different suction volumes and vacuum levels to be manufactured on the same platform, meeting the market demand for products with different specifications and realizing integrated modular manufacturing, which allows companies to achieve more efficient lean manufacturing in many aspects, such as manufacturing and assembly, quality control, and cost containment, without purchasing components, and improve product quality.

[0034] The above description is for the purpose of explaining the present invention, and should not be construed as limiting or narrowing the scope of the invention described in the claims. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims. [Explanation of symbols]

[0035] 1 Roots Vacuum Pump 2. Housing 2' recess 3 Front flange 4 Rear flange 5 First O-type seal ring groove 6 Cooling water chamber 7 Second O-type seal ring groove 9 Upper inclined guide surface 10 Lower inclined guide surface 21 Reinforcing rib 31 bolt holes 41 bolt holes 51 First O-type seal ring 61 Front end surface 62 Rear end surface 64 Seal plate 71 Second O-type seal ring 81 Cooling water outlet 82 Cooling water inlet 100 Joint Ring 101 frames 103 Inner wall 102 Pump leg 200 End cover

Claims

1. A joining ring for a Roots vacuum pump, the joining ring (100) being attached to at least one end of a housing (2) of a Roots vacuum pump (1), the joining ring (100) being used to expand the effective volume space of the housing (2), the joining ring (100) being a hollow annular structure, the frame (101) having a shape that matches the shape of the end of the housing (2), the frame (101) having a front end flange (3) formed at its front end and a rear end flange (4) formed at its rear end, A joining ring for a Roots vacuum pump, characterized in that a plurality of reinforcing ribs (21) are formed on the outer frame edge of the frame (101), the plurality of reinforcing ribs (21) are located between both end faces of the front end flange (3) and the rear end flange (4), and a plurality of recesses (2') are formed between the front end flange (3), the rear end flange (4), and each of the reinforcing ribs (21).

2. 2. The joining ring for a Roots vacuum pump according to claim 1, wherein a plurality of bolt holes (31) are formed in an end surface of the front flange (3), the front flange (3) being joined to a housing (2) of the Roots vacuum pump (1), and a plurality of bolt holes (41) are formed in an end surface of the rear flange (4).

3. 3. The joining ring of a Roots vacuum pump according to claim 2, characterized in that a first O-shaped seal ring groove (5) for mounting a first O-shaped seal ring (51) is formed on the same end surface of the rear end flange (4) as the bolt hole (41), and when assembled, one end having the O-shaped seal ring groove (5) is joined to an end cover (200) to form a sealed structure.

4. The cooling water chamber (6) is located at the bottom of the frame (101), and when the bottom of the cooling water chamber (6) is covered with a seal plate (64), a sealed cooling water chamber is formed.

2. The joining ring of a Roots vacuum pump according to claim 1, wherein the front end surface (61) and the rear end surface (62) of the cooling water chamber (6) are aligned flat with both end surfaces of the front end flange (3) and the rear end flange (4), and the left and right end surfaces of the cooling water chamber (6) are straddled between the front end surface (61) and the rear end surface (62) of the cooling water chamber (6).

5. 5. The joining ring of a Roots vacuum pump according to claim 4, characterized in that a second O-shaped seal ring groove (7) for mounting a second O-shaped seal ring (71) is formed in the bottom surface of the cooling water chamber (6), and a cooling water outlet (82) and a cooling water inlet (81) are formed in the front end surface (61) and the rear end surface (62) of the cooling water chamber (6), respectively.

6. 2. The joining ring of claim 1, wherein the inner wall (103) of the frame (101) is formed with an upper inclined guide surface (9) and a lower inclined guide surface (10).

7. 7. The joining ring of claim 6, wherein the inclination angle of the upper inclined guide surface (9) and the lower inclined guide surface (10) relative to the inner wall (103) is 17.3 degrees.

8. 4. The joining ring of a Roots vacuum pump according to claim 3, wherein, when assembled, the rear end flange (4) is joined to the end cover (200), and a plurality of bolts are passed through bolt holes in the end cover (200), the rear end flange (4) of the joining ring, and the front end flange (3) of the joining ring in turn, and are connected to a plurality of screw holes in the housing (2) of the Roots vacuum pump (1), so that the end cover (200), the joining ring (100), and the Roots vacuum pump (1) are connected to form a single unit.

9. 2. The joining ring of a Roots vacuum pump according to claim 1, characterized in that at least one hanging screw hole (11) is formed in the upper part of the frame (101), and the hanging screw hole (11) is used to hang the joining ring (100) so as to make it convenient to attach and detach the joining ring (100).

10. 2. The joining ring of the Roots vacuum pump according to claim 1, wherein at least one pump leg (102) can be attached to the bottom of the frame (101), and the frame (101) and the pump leg (102) are connected by screws.

Images