Roots vacuum pump coupling

Abstract

A coupling ring for a Roots vacuum pump, relating to the field of Roots vacuum pump technology, is installed at at least one end of a Roots vacuum pump housing; the coupling ring is used to expand the effective volume space of the housing; the coupling ring includes: a frame, the frame being a hollow annular structure whose shape is adapted to the shape of the end of the housing; a front flange formed at the front end of the frame; a rear flange formed at the rear end of the frame; a plurality of reinforcing ribs formed on the outer edge of the frame, the plurality of reinforcing ribs being located between the two end faces of the front flange and the rear flange; a plurality of grooves formed between the reinforcing ribs. A cooling water chamber is also included at the bottom of the frame. This invention expands the volume of the Roots vacuum pump, and different combinations of the Roots vacuum pump and the coupling ring can be implemented on the same platform.

Description

Technical Field

[0001] This invention relates to Roots vacuum pumps, and more particularly to a coupling ring for a Roots vacuum pump. Background Technology

[0002] Roots vacuum pumps are rotary displacement vacuum pumps without internal compression. They utilize a pair of rotors rotating synchronously and in opposite directions within the pump chamber to move gas and achieve vacuum. Seals between the rotors and between the rotors and the pump casing are achieved through gaps, eliminating the need for oil seals or lubrication. Roots vacuum pumps are characterized by high pumping speed, high volumetric efficiency, high vacuum level, low energy consumption, compact structure, and stable and reliable operation. They are widely used in industries such as power generation, semiconductors, photovoltaics, petrochemicals, food processing, and metallurgy.

[0003] Because customers have different needs for Roots vacuum pumps, such as pumping capacity, ultimate vacuum, and installation methods, most Roots vacuum pumps are designed and manufactured as non-standard custom products. While non-standard customization can better meet customer needs, it requires more manpower and resources for Roots vacuum pump designers and manufacturers.

[0004] The pump body is the fundamental component of a Roots vacuum pump. The pump body is a single-piece casting; the larger the pump body, the more difficult the casting and machining process. Considering performance, manufacturing, and cost, a large pump body does not offer the best cost-performance ratio. When meeting the same functional and quality requirements, cost is the core factor for designers and manufacturers to win in the market.

[0005] The need for non-standard customization to better meet customer demands and the desire for designers and manufacturers to provide high-quality, inexpensive products are often contradictory. Integrated and modular production can effectively resolve this contradiction. For designers and manufacturers, integrated and modular production increases production flexibility and convenience, while also shortening product development time, improving production efficiency, and reducing production costs.

[0006] In production, we need to explore more integrated and modular production methods to meet customer needs with low cost and high performance. Summary of the Invention

[0007] The purpose of this invention is to solve the problems of the prior art by proposing a connector for a Roots vacuum pump. This design transforms the original long pump body into a short pump body with a connector, shortening the pump body length and making casting and machining easier. The combination of the pump body and connector represents an integrated, modular production method. The connector design avoids a series of problems caused by an excessively large pump body. Furthermore, the flexible combination of the connector and pump body allows designers and manufacturers to quickly, efficiently, and cost-effectively meet more user needs within existing production capabilities. Therefore, this invention aims to provide a novel connector for a Roots vacuum pump to overcome the shortcomings of the prior art.

[0008] To achieve the above objectives, the present invention provides a connecting ring for a Roots vacuum pump, wherein the connecting ring is installed at at least one end of the housing of a Roots vacuum pump; the connecting ring is used to expand the effective volume space of the housing; the connecting ring includes: a frame, the frame being a hollow annular structure whose shape is adapted to the shape of the end of the housing; a front flange is formed at the front end of the frame; a rear flange is formed at the rear end of the frame; a plurality of reinforcing ribs are formed on the outer edge of the frame, the plurality of reinforcing ribs being located between the two end faces of the front flange and the rear flange; a plurality of grooves are formed between the reinforcing ribs.

[0009] Furthermore, multiple bolt holes are formed on the end face of the front flange for engaging the front flange with the housing of the Roots vacuum pump, and multiple bolt holes are formed on the end face of the rear flange.

[0010] Furthermore, a first O-ring groove is formed on the same end face as the bolt holes of the rear flange, and a first O-ring is installed inside the first O-ring groove. One end with the O-ring groove is joined with an end cap to form a sealing structure.

[0011] Furthermore, it also includes a cooling water chamber located at the bottom of the frame; wherein, after the bottom of the cooling water chamber is covered with a sealing plate, the whole structure forms a sealed cooling water chamber. The front end face and the rear end face of the cooling water chamber are flush with the two end faces of the front flange and the rear flange; the left and right end faces of the cooling water chamber span between the front end face and the rear end face of the cooling water chamber.

[0012] Furthermore, a second O-ring groove is formed on the bottom surface of the cooling water chamber, and a second O-ring is installed in the second O-ring groove; wherein a cooling water outlet and a cooling water inlet are respectively formed on the front end face and the rear end face of the cooling water chamber.

[0013] Furthermore, the inner wall surface of the frame is formed with a top sloping guide surface and a bottom sloping guide surface.

[0014] Furthermore, the inclination angle of the top and bottom slope guide surfaces relative to the inner wall surface is 17.3°.

[0015] Furthermore, during assembly, the rear flange flange is engaged with the end cover; multiple bolts are sequentially passed through the bolt holes on the end cover, the rear flange flange of the connecting ring, and the front flange flange of the connecting ring, and connected to multiple threaded holes on the housing of the Roots vacuum pump, thus connecting the end cover, the connecting ring, and the pump body of the Roots vacuum pump into a single unit.

[0016] Furthermore, at least one lifting threaded hole is formed on the top of the frame, which is used to lift the connecting ring.

[0017] Furthermore, at least one pump foot is installed at the bottom of the frame, and the frame is connected to the pump foot by screws.

[0018] The beneficial effects of this invention are that the coupling ring expands the volume of the Roots vacuum pump, and different combinations of the Roots vacuum pump and the coupling ring can generate products with different pumping capacities and vacuum levels on the same platform to meet the market demand for products of different specifications, thus realizing integrated and modular production of products. This integrated and modular production enables enterprises to achieve lean production and improve product quality more efficiently in many aspects such as component procurement, manufacturing and installation, quality control, and cost reduction.

[0019] The features and advantages of the invention will be further understood from the following description, and please refer to the accompanying drawings while reading. Attached Figure Description

[0020] Figure 1 Showing a front view of the connector of the present invention; Figure 2 Showing a rear view of the connector of the present invention; Figure 3 This diagram shows the connection between the coupling ring of the present invention and the Roots vacuum pump; Figure 4 This diagram shows the connection between the connecting ring of the present invention and the first O-ring seal. Figure 5 This diagram shows the connection between the connector ring and the end cap of the present invention. Figure 6 This invention illustrates embodiments of the invention.

[0021] Explanation of reference numerals in the attached figures 100. Connecting ring; 101. Frame; 102. Pump foot; 103. Inner wall surface; 11. Lifting threaded hole; 1. Roots vacuum pump; 2. Housing; 21. End cover; 3. Front flange; 4. Rear flange; 5. First O-ring groove; 51. First O-ring; 200. End cover; 6. Cooling water chamber; 61. Front face; 62. Rear face; 7. Second O-ring groove; 71. Second O-ring groove; 81. Cooling water outlet; 82. Cooling water outlet; 9. Sloping guide surface; 10. Bottom sloping guide surface. Detailed Implementation

[0022] The following is a detailed description of a preferred embodiment of the present invention, in conjunction with the accompanying drawings, regarding its structural composition, effects, and advantages.

[0023] Please refer to Figures 1 to 6As shown, the coupling of the Roots vacuum pump of the present invention is illustrated, such as... Figure 6 As shown, during assembly, the coupling ring 100 is installed at at least one end of the housing 2 of a Roots vacuum pump 1. The coupling ring 100 is used to expand the effective volume space of the housing 2. The coupling ring 100 can be connected to one end of the housing 2, or one coupling ring 100 can be connected to each end of the housing 2. The length of the coupling ring 100 is made into a series of product lengths; preferably, the length of the coupling ring 100 is 140 mm.

[0024] like Figure 1 As shown, the connecting ring 100 includes: A frame 101, which is a hollow ring structure, is adapted to the shape of the end of the shell 2.

[0025] The front end of the frame 101 forms a front flange 3; multiple bolt holes 31 are formed on the end face of the front flange 3, and the front flange 3 is engaged with the housing 2 of the Roots vacuum pump 1 as follows: Figure 3 The inner diameter of the frame 101 is equal to the inner diameter of the shell 2, and preferably the inner diameter R of the frame 101 is 220mm.

[0026] The rear end of the frame 101 forms a rear flange 4; multiple bolt holes 41 are formed on the end face of the rear flange 4. For example... Figure 4 As shown, a first O-ring groove 5 is formed on the same end face as the bolt hole 41 of the rear flange 4, which is used to install a first O-ring 51. Figure 5 and Figure 6 As shown, one end of the O-ring groove 5 is joined to an end cap 200 to form a sealing structure.

[0027] The outer edge of the frame 101 forms a plurality of reinforcing ribs 21, which are located between the two end faces of the front flange 3 and the rear flange 4. Each reinforcing rib 21 is parallel to the axis of the frame 101. Preferably, the width of the reinforcing rib 21 is 30 mm. A plurality of grooves 2 are formed between the front flange 3, the rear flange 4, and each reinforcing rib 21. Preferably, the depth of the grooves 2 is 48 mm.

[0028] The groove 2 is used to reduce the weight of the connector 100, the reinforcing rib 21 is used to strengthen the connector 100, and the natural radiation heat dissipation area or convective cooling capacity of the connector 100 are increased.

[0029] A cooling water chamber 6 is located at the bottom of the frame 101. A front end face 61 and a rear end face 62 of the cooling water chamber 6 are flush with the two end faces of the front flange 3 and the rear flange 4. The left and right end faces of the cooling water chamber 6 span between the front end face 61 and the rear end face 62 of the cooling water chamber 6.

[0030] The bottom surface of the cooling water chamber 6 forms a second O-ring groove 7 for mounting a 71. A cooling water outlet 82 and a cooling water inlet 81 are respectively formed on the front end face 61 and the rear end face 62 of the cooling water chamber 6. In use, circulating cooling water is introduced into the cooling water chamber 6 through the cooling water inlet 81, which can force cooling of the connector 100, helping to reduce the temperature of the Roots vacuum pump 1. After the bottom of the cooling water chamber 6 is covered with a sealing plate 64, a sealed cooling water chamber is formed.

[0031] A top sloping flow guide surface 9 and a bottom sloping flow guide surface 10 are formed on the inner wall surface 103 of the frame 101. Preferably, the inclination angle of the top sloping flow guide surface 9 and the bottom sloping flow guide surface 10 relative to the inner wall surface 103 is 17.3°.

[0032] The Roots vacuum pump 1 has two corresponding pump body ramp guide surfaces (not shown) on both sides of its inlet and outlet along the impeller axis. These two ramp guide surfaces are integrated with the corresponding top ramp guide surface 9 and bottom ramp guide surface 10. The top ramp guide surface 9 guides the gas from the inlet of the Roots vacuum pump 1 to both ends of the impeller along the impeller axis. The bottom ramp guide surface 10 guides the gas inside the Roots vacuum pump 1 to the outlet along the impeller axis. Furthermore, condensate formed during production flows out of the outlet along the bottom ramp guide surface 10, preventing residue accumulation inside the Roots vacuum pump 1.

[0033] During assembly, the rear flange 4 engages with the end cap 200. For example... Figure 5 As shown, multiple M16 long bolts (not shown) are sequentially passed through the ø18 bolt holes on the end cap 200, the rear flange 4 of the connecting ring, and the front flange 3 of the connecting ring, and connected to multiple M16 threaded holes on the housing 2 of the Roots vacuum pump 1, thus connecting the end cap 200, the connecting ring 100, and the pump body of the Roots vacuum pump 1 into a single unit. When the connecting ring 100 is not used, the end cap 200 is directly connected to the housing 2 of the Roots vacuum pump 1 via multiple M16 bolts.

[0034] The connecting ring 100 is positioned between itself and the housing 2, and between itself and the end cap 200, by two ø16 cylindrical pins. When the connecting ring 100 is not in use, the housing 2 and the end cap 200 are positioned by the two ø16 cylindrical pins. The ø16 cylindrical pins and ø16 pin holes are used for sliding fit positioning between the housing 2 and the connecting ring 100, between the connecting ring 100 and the end cap 200, and between the Roots vacuum pump 1 and the end cap 200, effectively ensuring the coaxiality and orientation accuracy of the connection.

[0035] The top of the frame 101 has at least one lifting threaded hole 11, which is used to lift the coupling ring 100 to facilitate the assembly and disassembly of the coupling ring 100. Preferably, the lifting threaded hole 11 is an M20 threaded hole, which can be used to install the corresponding M20 eye bolt (not shown).

[0036] During assembly, a pair of fan rotors are installed inside the Roots vacuum pump 1 or the assembly of the Roots vacuum pump 1 and the connecting ring 100, and the cavity formed by the end caps 200 at both ends, to jointly complete the vacuuming operation. The fan rotor support bearing is installed inside the end cap 200.

[0037] At least one pump foot 102 can be installed at the bottom of the frame 101, that is, at least one M16 threaded hole is formed at the bottom of the frame 101, and the frame 101 is connected to the pump foot 102 by an M16 screw. Installing the pump foot 102 at the bottom of the frame 101 expands the installation options of the Roots vacuum pump 1, meets the needs of more different installation positions, improves the flexibility and convenience of installation, and makes the product compact and aesthetically pleasing.

[0038] An O-ring seal is used between the end face of the housing 2 of the Roots vacuum pump 1 and the connecting ring 100. An O-ring groove is formed on the end face of the Roots vacuum pump 1 (not shown in the figure). When the connecting ring 100 is not used, i.e., the end cover 200 is directly connected to the Roots vacuum pump 1, the O-ring seal is used to seal between the Roots vacuum pump 1 and the end cover 200. The O-ring seal provides good sealing performance and facilitates easy assembly and disassembly.

[0039] The advantage of this invention is that the coupling ring expands the volume of the Roots vacuum pump. Different combinations of the Roots vacuum pump and the coupling ring can generate products with different pumping capacities and vacuum levels on the same platform, adapting to market demands for different specifications and achieving integrated and modular production. This integrated and modular production enables companies to achieve lean production and improve product quality more efficiently in areas such as component procurement, manufacturing and installation, quality control, and cost reduction.

[0040] In summary, the human-centered and considerate design of this invention is highly suitable for practical needs. Its specific improvements over existing technologies represent a significant breakthrough, offering substantial enhancements that are not easily achieved. Furthermore, this invention has not been disclosed in domestic or international literature or markets, thus complying with patent law.

[0041] The foregoing detailed description pertains to a feasible embodiment of the present invention. However, this embodiment is not intended to limit the scope of the patent of the present invention. All equivalent implementations or modifications that do not depart from the spirit of the present invention should be included within the scope of the patent of the present invention.

Claims

1. A coupling ring for a Roots vacuum pump, characterized in that, The coupling ring (100) is installed at at least one end of the housing (2) of a Roots vacuum pump (1) to expand the effective volume space of the housing (2); the coupling ring (100) includes: A frame (101) is a hollow annular structure whose shape is adapted to the shape of the end of the shell (2); a front flange (3) is formed at the front end of the frame (101); a rear flange (4) is formed at the rear end of the frame (101). The outer frame edge of the frame (101) forms a plurality of reinforcing ribs (21), which are located between the two end faces of the front flange (3) and the rear flange (4); a plurality of grooves (2) are formed between the front flange (3), the rear flange (4) and each reinforcing rib (21).

2. The coupling ring of the Roots vacuum pump as described in claim 1, characterized in that, Multiple bolt holes (31) are formed on the end face of the front flange (3) for engaging the front flange (3) with the housing (2) of the Roots vacuum pump (1), and multiple bolt holes (41) are formed on the end face of the rear flange (4).

3. The coupling ring of the Roots vacuum pump as described in claim 2, characterized in that, A first O-ring groove (5) is formed on the same end face as the bolt hole (41) of the rear flange (4). A first O-ring (51) is installed inside the first O-ring groove (5). One end of the O-ring groove (5) is joined with an end cap (200) to form a sealing structure.

4. The coupling ring of the Roots vacuum pump as described in claim 1, characterized in that, It also includes a cooling water chamber (6) located at the bottom of the frame (101); wherein after the bottom of the cooling water chamber (6) is covered with a sealing plate (64), the whole forms a sealed cooling water chamber; The front end face (61) and the rear end face (62) of the cooling water cavity (6) are flush with the two end faces of the front flange (3) and the rear flange (4); the left and right end faces of the cooling water cavity (6) span between the front end face (61) and the rear end face (62) of the cooling water cavity (6).

5. The coupling ring of the Roots vacuum pump as described in claim 4, characterized in that, The bottom surface of the cooling water chamber (6) forms a second O-ring groove (7), and a second O-ring (71) is installed in the second O-ring groove (7); wherein a cooling water outlet (82) and a cooling water inlet (81) are respectively formed on the front end face (61) and the rear end face (62) of the cooling water chamber (6).

6. The coupling ring of the Roots vacuum pump as described in claim 1, characterized in that, The inner wall surface (103) of the frame (101) forms a top sloping guide surface (9) and a bottom sloping guide surface (10).

7. The coupling ring of the Roots vacuum pump as described in claim 6, characterized in that, The inclination angle of the top slope guide surface (9) and the bottom slope guide surface (10) relative to the inner wall surface (103) is 17.3°.

8. The coupling ring of the Roots vacuum pump as described in claim 3, characterized in that, During assembly, the rear flange (4) is joined to the end cover (200); multiple bolts are sequentially passed through the bolt holes on the end cover (200), the rear flange (4) of the connecting ring, and the front flange (3) of the connecting ring, and connected to multiple threaded holes on the housing (2) of the Roots vacuum pump (1), thereby connecting the end cover (200), the connecting ring (100) and the pump body of the Roots vacuum pump (1) into a whole.

9. The coupling ring of the Roots vacuum pump as described in claim 1, characterized in that, The top of the frame (101) has at least one lifting threaded hole (11) for lifting the connecting ring (100).

10. The coupling ring of the Roots vacuum pump as described in claim 1, characterized in that, At least one pump foot (102) is installed at the bottom of the frame (101), and the frame (101) is connected to the pump foot (102) by screws.

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