A clamshell dry vacuum pump housing seal assembly
By introducing a combination of transverse seals, annular seals, and transition seals into the shell structure of the clamshell vacuum pump, the sealing problem at the shell joints is solved, achieving higher sealing performance and vacuum level, and improving the reliability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI GUANGDE XINGRUI TECHNOLOGY CO LTD
- Filing Date
- 2025-09-19
- Publication Date
- 2026-07-24
AI Technical Summary
The shell structure of clamshell vacuum pumps presents sealing challenges at the joints, especially the T-shaped gaps formed at the junctions of the shell joints and the joints between the bearing plates at both ends and the shell, which lead to seal failure and affect the working performance of the vacuum pump.
The design employs a combination of transverse seals, annular seals, and transition seals. The transverse seals and annular seals are connected by contact and compression, while the transition seals fill the assembly gap between their ends, forming a continuous and uninterrupted sealing loop. This solves the leakage problem at multi-plane and multi-angle joints.
It significantly improves the overall sealing performance and vacuum level of the vacuum pump, enhances sealing reliability, and eliminates leakage problems in the sealing components.
Smart Images
Figure CN224550345U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of vacuum pump sealing technology, and specifically relates to a sealing component for a clamshell-type dry vacuum pump housing. Background Technology
[0002] In many fields of modern industrial production, such as semiconductor manufacturing, chemical processes, pharmaceutical processes, and scientific research experiments, the demand for vacuum environments is becoming increasingly stringent. Dry vacuum pumps have emerged and are widely used in response to this need. Due to their ability to operate without lubricating oil, dry vacuum pumps effectively avoid a series of problems caused by oil contamination in traditional oil-sealed mechanical pumps. They can operate stably over a wider pressure range, providing clean and efficient vacuum solutions for various industries.
[0003] Compared to single-stage vacuum pumps, multi-stage vacuum pumps exhibit significant advantages in several key performance indicators. Regarding vacuum level, single-stage vacuum pumps, limited by their structure, can typically only achieve a certain vacuum level, making it difficult to meet the stringent high-vacuum requirements of fields such as semiconductor manufacturing and vacuum coating. Multi-stage vacuum pumps, on the other hand, utilize multiple pumping units connected in series to achieve progressively lower gas pressure, thus obtaining a higher ultimate vacuum level than single-stage pumps. This provides a more ideal vacuum environment for precision machining and scientific experiments.
[0004] In multistage vacuum pumps, one-piece rotors offer significant advantages over traditional rotors. The one-piece rotor utilizes a monolithic molding process, greatly simplifying the rotor structure, reducing the number of parts and assembly steps, and eliminating potential leakage points caused by the connection of multistage stator components, thus improving the compactness and reliability of the rotor structure.
[0005] The clamshell-style housing also exhibits unique advantages and potential problems in multistage vacuum pump applications. The clamshell-style housing employs a symmetrical opening and closing design, similar to a seashell, allowing for easy opening and closing. This structural design makes the installation and maintenance of the integrated rotor and other internal components much more convenient and faster. During equipment maintenance, the housing can be directly opened for inspection, repair, and replacement of internal components without complicated disassembly steps, significantly shortening maintenance time and improving equipment maintainability.
[0006] However, sealing the clamshell-type shell also presents significant challenges. Due to its unique opening and closing structure, the seams of the shell become critical weak points in the seal, especially the T-shaped gaps formed at the junction of the shell seams and the seams between the bearing plates at both ends and the shell, which are high-risk areas for seal failure.
[0007] Patent application CN112654767A discloses a sealing assembly for a rotating machine, comprising: at least one annular seal (specifically two, located on opposite sides of a chamber); and at least one longitudinal seal (specifically two, located at opposite ends of the chamber). The annular seal defines an orifice for receiving the longitudinal seal therein, and the annular seal is configured to reduce the size of the orifice when compressed. However, this requires the longitudinal sealing groove receiving the longitudinal seal and the annular sealing groove receiving the annular seal to be perfectly aligned at the T-joint. This requirement places certain demands on the structural design of the vacuum pump. Furthermore, the significant difference in cross-sectional dimensions between the longitudinal and annular seals makes it difficult for the longitudinal seal to be properly fitted during assembly due to the influence of the annular seal. Additionally, the deformation during pump operation with temperature increases also differs considerably.
[0008] Patent application CN110199088A discloses a vacuum pump with an offset stator seal and a method for manufacturing it. The seal includes two longitudinal seals (arranged on both sides of the chamber); and O-ring seals (specifically standard O-rings) at both ends of the housing. The O-rings and longitudinal seals are aligned and contacted at the T-joint for sealing. However, this requires that the ends of the longitudinal seals be completely aligned with the O-rings, and the structure of the ends of the longitudinal seals is specifically designed to ensure that their ends are completely aligned with the O-rings.
[0009] The patent application with publication number CN104797823A discloses a sealing gasket between the two half-shell stators of a multi-stage vacuum pump. The sealing components include: two gaskets (arranged on both sides of the chamber); and O-ring seals (specifically standard O-rings) at both ends of the housing. The O-rings and the longitudinal recesses of the gaskets are aligned and contacted at the T-shaped joint to seal the gaskets. Moreover, during assembly, tooling is needed to fix the recesses at the ends of the gaskets to ensure alignment.
[0010] Patent application CN103443400B discloses a vacuum pump with longitudinal and annular seals, the seals comprising: a longitudinal seal for sealing two half-shell stator components; and an annular seal for sealing the two half-shell stator components and the end stator component, wherein the ends of the longitudinal seal are enlarged and the center is aligned with the annular seal.
[0011] In summary, in multistage vacuum pumps, the integrated multistage rotor, combined with the clamshell-type stator and end stator components, greatly simplifies the rotor structure, reduces the number of parts and assembly steps, and improves the compactness and reliability of the rotor structure. However, while this structure brings technological innovation, it also creates a unique sealing challenge: a T-shaped gap is formed at the junction of the end stator component and the two half-shell stator components. This structural feature leads to sealing problems in the clamshell-type casing seal structure, adversely affecting the operation of the vacuum pump. Utility Model Content
[0012] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a sealing component for a clamshell-type dry vacuum pump housing.
[0013] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a sealing assembly for a clamshell-type dry vacuum pump housing, including a housing stator component and an end stator component. The housing stator component includes a lower housing and an upper housing. A transverse sealing groove is provided at the connection surface between the lower housing and the upper housing, and transition sealing grooves are provided at both ends of the transverse sealing groove. The end stator component is installed at both ends of the housing stator component, and an annular sealing groove is provided at the connection between the end stator component and the housing stator component. A transverse seal is installed in the transverse sealing groove, a transition seal is installed in the transition sealing groove, and an annular seal is installed in the annular sealing groove. The two ends of the transition seal are respectively connected to the end of the transverse seal and the annular seal.
[0014] The lower housing includes several axially distributed lower rotor blade chambers. The two ends of the lower rotor blade chambers are a lower low-pressure end auxiliary chamber and a lower high-pressure end auxiliary chamber, respectively. The lower rotor blade chambers are separated by a lower partition wall. A lower rotor shaft hole is opened at the top of the lower partition wall. Transverse sealing grooves are provided on both sides of the top of the lower housing. Transverse sealing grooves are provided at both ends of the transverse sealing grooves.
[0015] The upper and lower housings are arranged symmetrically. The upper housing includes an upper rotor blade chamber and an upper partition wall. The two ends of the upper rotor blade chamber are an upper low-pressure end auxiliary chamber and an upper high-pressure end auxiliary chamber, respectively. An upper rotor shaft hole is opened at the bottom of the upper partition wall. The two ends of the bottom of the upper housing are provided with upper housing transition sealing grooves, and the positions of the upper housing transition sealing grooves correspond to the positions of the lower housing transition sealing grooves.
[0016] After the upper and lower housings are assembled, the upper rotor blade chamber and the lower rotor blade chamber form the rotor blade chamber. The lower low-pressure end auxiliary chamber and the upper low-pressure end auxiliary chamber together form the low-pressure end auxiliary chamber. The lower high-pressure end auxiliary chamber and the upper high-pressure end auxiliary chamber together form the shell end high-pressure end auxiliary chamber. The lower housing transition sealing groove and the upper housing transition sealing groove together form the transition sealing groove.
[0017] The end stator component includes a low-pressure end stator component and a high-pressure end stator component; the low-pressure end stator component includes a first auxiliary chamber, a low-pressure end shaft hole is opened in the middle of the first auxiliary chamber, a low-pressure end annular sealing groove is arranged around the first auxiliary chamber, a low-pressure end lateral extension is symmetrically arranged on the low-pressure end annular sealing groove, the position of the low-pressure end lateral extension corresponds to the position of the lateral sealing groove, and a low-pressure end receiving hole is provided on the low-pressure end lateral extension; the structure of the high-pressure end stator component is the same as that of the low-pressure end stator component.
[0018] The low-pressure end shaft hole is aligned with the shaft hole of the housing stator component.
[0019] The transition seal is an integrally molded structure, comprising a first part, a second part, and a third part. The first part is an annular shape with a receiving hole in the center; the second part is a horizontal strip shape; and the third part is a vertical rectangle. The first part and the third part are connected through the second part.
[0020] The diameter of the receiving hole is slightly smaller than the diameter of the transverse seal, and the width of the third part is 2 to 2.5 times that of the annular sealing groove.
[0021] The transition seal and the transverse seal are connected in the following manner: the end of the transverse seal passes through and extends out of the receiving hole of the transition seal, and the protruding part of the transverse seal is fixed in the low-pressure end receiving hole.
[0022] The connection between the transverse seal and the annular seal is achieved by contact and compression after assembly to form a sealed connection.
[0023] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a sealing assembly for a clamshell-type dry vacuum pump housing. Through a combination of a transverse seal, an annular seal, and a transition seal, a complete sealing assembly is formed. This assembly effectively seals two vertical sealing interfaces simultaneously: the transverse connection surface between the upper and lower housings of the housing and stator components, and the annular connection surface between the housing and stator components and the end stator components. This solves the leakage problem at multi-plane, multi-angle joints, significantly improving the overall sealing performance and vacuum level of the vacuum pump.
[0024] Furthermore, the transition seal is used to connect the transverse seal and the annular seal, filling the assembly gap between their ends caused by the lack of direct contact, forming a continuous and uninterrupted sealing loop, fundamentally eliminating sealing problems of the sealing assembly and improving sealing reliability. Attached Figure Description
[0025] Figure 1 A pump assembly for a clamshell vacuum pump is shown; Figure 2A schematic diagram of the sealing assembly of Embodiment 1 is shown; Figure 3 It shows Figure 2 Enlarged view of point A; Figure 4 The outline shape of the transition seal in Embodiment 1 is shown; Figure 5 An isometric view of a pump assembly with a seal according to Embodiment 1 is shown; Figure 6 It shows Figure 5 Enlarged view of point B; Figure 7 A cross-sectional view of the mating surface between the upper and lower shells of Embodiment 1 is shown; Figure 8 It shows Figure 7 Enlarged view at point C; Figure 9 The end stator component of Embodiment 1 is shown; Figure 10 A schematic diagram of the sealing groove of the housing stator component in Embodiment 1 is shown; Figure 11 It shows Figure 9 Enlarged view at point D; Figure 12 An isometric view of a pump assembly with a novel seal, according to Embodiment 2, is shown. Figure 13 A schematic diagram of the new sealing assembly in Embodiment 2 is shown; Figure 14 A cross-sectional view of the mating surface between the upper and lower shells is shown in Embodiment 2. Figure 15 It shows Figure 14 Enlarged view at point E in the image; Explanation of reference numerals in the figures: 1. Stator housing; 101. Rotor blade chamber; 102. Partition wall; 103. Shaft hole; 104. Low-pressure end auxiliary chamber; 105. High-pressure end auxiliary chamber; 107. Transition sealing groove; 1071. First groove; 1072. Second groove; 1073. Third groove; 11. Lower housing; 111. Lower rotor blade chamber; 112. Lower partition wall; 113. Lower rotor shaft hole; 114. Lower low-pressure auxiliary chamber; 115. Lower high-pressure auxiliary chamber; 116. Transverse sealing groove; 117. Lower housing transition sealing groove; 1171. Lower first groove; 1172. Lower second groove; 1173. Lower third groove; 12. Upper housing; 123. Upper rotor shaft hole; 124. Upper low-pressure auxiliary chamber; 125. Upper high-pressure auxiliary chamber; 127. Upper housing transition sealing groove; 1271. Upper third groove; 1. Groove 1272. Upper second groove 1273. Upper third groove 2. End stator component 2. Low-pressure end stator component 2.1. First auxiliary chamber 2.2. Low-pressure end shaft hole 2.1. Low-pressure end annular sealing groove 2.1. Low-pressure end lateral extension 2.1. Low-pressure end receiving hole 2.2. High-pressure end stator component 2.2. Second auxiliary chamber 2.2. High-pressure end shaft hole 2.2. High-pressure end annular sealing groove 2.2. High-pressure end lateral extension 2.2. High-pressure end receiving hole 3. Sealing assembly 3.1. Lateral seal 3.2. Transition seal 3.2. First part 3.2.1. Receiving hole 3.2. Second part 3.2. Third part 3.3. Annular seal 3.4. Housing seal 3.4. First bend 3.4. Second bend 3.4. End straight section 3.4. End head. Detailed Implementation
[0026] To further understand the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of the invention.
[0027] A sealing assembly for a clamshell-type dry vacuum pump housing has the following structural components: Example 1 A sealing assembly for a clamshell-type dry vacuum pump housing includes a housing stator component 1 and an end stator component 2. The housing stator component 1 includes a lower housing 11 and an upper housing 12. A transverse sealing groove 116 is provided at the connection surface between the lower housing 11 and the upper housing 12, and transition sealing grooves 107 are provided at both ends of the transverse sealing groove 116. The end stator component 2 is installed at both ends of the housing stator component 1, and an annular sealing groove is provided at the connection between the end stator component 2 and the housing stator component 1. A transverse seal 31 is installed in the transverse sealing groove 116, a transition seal 32 is installed in the transition sealing groove 107, and an annular seal 33 is installed in the annular sealing groove. The two ends of the transition seal 32 are respectively connected to the end of the transverse seal 31 and the annular seal 33.
[0028] like Figure 1 As shown, the stator component 1 includes a lower housing 11 and an upper housing 12. The lower housing 11 includes several axially distributed lower rotor blade chambers 111 for accommodating rotor blades, with the volume of each rotor blade chamber gradually decreasing from low pressure to high pressure. A lower low-pressure end auxiliary chamber 114 and a lower high-pressure end auxiliary chamber 115 are located at both ends of the lower rotor blade chamber 111, respectively. The lower rotor blade chambers 111 are separated by a lower partition wall 112. A lower rotor shaft hole 113 is opened at the top of the lower partition wall 112, and two sets of lower rotor shaft holes 113 are opened in parallel at the top of the lower partition wall 112 for accommodating rotor shafts. Lower housing transverse sealing grooves 116 are opened in parallel on the top of both sides of the lower housing 11, and lower housing transition sealing grooves 117 are opened at both ends of the lower housing transverse sealing grooves 116. The upper housing 12 and the lower housing 11 are arranged symmetrically. The upper housing 12 includes: several axially distributed upper rotor blade chambers for accommodating rotor blades, with the volume of each rotor blade chamber gradually decreasing from low pressure to high pressure; an upper low-pressure end auxiliary chamber 124 and an upper high-pressure end auxiliary chamber 125 located at both ends of the upper rotor blade chambers; the upper rotor blade chambers are separated by an upper partition wall; two sets of parallel upper rotor shaft holes 123 are opened at the bottom of the upper partition wall for accommodating rotor shafts; and upper housing transition sealing grooves 127 are opened at both ends of the bottom of the upper housing 12, with a total of four grooves, the positions of which correspond to the lower housing transition sealing grooves 117.
[0029] When the lower housing 11 and the upper housing 12 are assembled together to form the housing stator component 1, their common structure forms the combined structure of the housing stator component 1, including: the lower rotor blade chamber 111 and the upper rotor blade chamber are of the same type and together form the rotor blade chamber 101, which is used to accommodate the integral rotor and form a working volume with it; the lower partition wall 112 and the upper partition wall are of the same type and together form the partition wall 102, which is used to divide the chambers of different pressure levels; the lower rotor shaft hole 113 and the upper rotor shaft hole 123 together form the shaft hole 103; the lower low-pressure end auxiliary chamber 114 and the upper low-pressure end auxiliary chamber 124 together form the shell end low-pressure end auxiliary chamber 104; the lower high-pressure end auxiliary chamber 115 and the upper high-pressure end auxiliary chamber 125 together form the shell end high-pressure end auxiliary chamber 105; the lower housing transition sealing groove 117 and the upper housing transition sealing groove 127 together form the transition sealing groove 107.
[0030] Furthermore, such as Figure 1 As shown, the end stator component 2 includes a low-pressure end stator component 21 and a high-pressure end stator component 22. The low-pressure end stator component 21 is aligned with the low-pressure end auxiliary chamber 104 of the housing stator component 1 during assembly. The low-pressure end stator component 21 includes: a first auxiliary chamber 211, which is assembled with the low-pressure end auxiliary chamber 104 and contains low-pressure gas; two low-pressure end shaft holes 212 are provided in the first auxiliary chamber 211, located in the middle and aligned with the shaft holes 103 of the housing stator component 1, for accommodating the rotor shaft; a low-pressure end annular sealing groove 213 is formed around the first auxiliary chamber 211 to accommodate an annular seal 33 to seal the low-pressure end stator component 21 after assembly with the housing stator component 1. The gap; two symmetrical low-pressure end lateral extensions 214 are provided on the low-pressure end annular sealing groove 213. They are extensions towards the center of the assembly mating surface between the low-pressure end stator component 21 and the housing stator component 1. The position of the low-pressure end lateral extension 214 corresponds to the position of the transverse sealing groove 116. A low-pressure end receiving hole 215 with a depth of about 9mm is provided on the low-pressure end lateral extension 214. After assembly, its central axis is aligned with the central axis of the transverse sealing groove 116 to accommodate the excess part of the end of the transverse sealing component 31. When assembling, the high-voltage end stator component 22 on the high-voltage side is aligned with the high-voltage end of the housing stator component 1. Its structural composition is the same as that of the low-voltage end stator component 21, including a second auxiliary chamber 221. The second auxiliary chamber 221 is provided with a high-voltage end shaft hole 222. A high-voltage end annular sealing groove 223 is opened around the second auxiliary chamber 221. A high-voltage end lateral extension 224 is symmetrically arranged on the high-voltage end annular sealing groove 223. A high-voltage end receiving hole 225 is provided on the high-voltage end lateral extension 224.
[0031] like Figures 2-3 As shown, the housing stator component 1 and the end stator component 2 are arranged as follows: Figure 1After the arrows are aligned and assembled, the annular seal 33 in the low-pressure end annular sealing groove 213 does not directly contact the transverse seal 31, causing a gap between them to form a leak. Therefore, a transition seal 32 is provided between them to connect this gap and form a seal. The two ends of the transition seal 32 are connected to the end of the transverse seal 31 and the annular seal 33, respectively. The connection with the transverse seal 31 is such that the end of the transverse seal 31 passes through and extends out of the transition seal 32. The connection with the annular seal 33 is achieved by contact and compression after assembly to form a sealing connection.
[0032] Preferably, there are two transverse seals 31, which are rubber strips with a circular cross-section; two annular seals 33, which are rubber rings with a circular cross-section; and four transition seals 32, which are irregularly shaped rubber sheets with a constant thickness.
[0033] Preferably, such as Figures 4-6 As shown, the transition seal 32 is a one-piece molded structure, comprising, from left to right, a first part 321, a second part 322, and a third part 323. Specifically: The first part 321 is an annular ring with an outer diameter of D2, and a receiving hole 3211 with a diameter of D1 is provided in the center for receiving and fixing the transverse seal 31 that passes through the hole.
[0034] The third part 323 is a rectangle with a width of B2 and a length of L2, with the length direction being vertical. The horizontal distance between its center and the center of the first part is L1. It is used to contact the annular seal 33 during assembly to achieve a seal.
[0035] The second part 322 is a horizontal strip with a width of B1, which completely covers the remaining gap between the upper and lower housing mating surfaces at the end of the housing stator component 1.
[0036] Wherein: The second part 322 is symmetrical about the mating surface of the upper and lower shells in the width direction, so the center line of symmetry of the second part is the position of the mating surface of the shells. D1 is slightly smaller than the diameter of the transverse seal 31. D2 is larger than the width of the transverse sealing groove 116, specifically 2 to 3 times the width of the transverse sealing groove 116. The common center of D1 and D2 is located on the lower side of the mating surface and is a distance e away. Because the center coincides with the axis of the compressed transverse seal 31, and the transverse seal 31 is squeezed by both the upper and lower surfaces during assembly, the deformation on both sides is uniform, so e is equal to 1 / 2 of the depth of the transverse sealing groove 116. The width B1 of the second part 322 should not be too large, as an excessively large width will cause uneven deformation of the first part 321. It is generally equal to the annular width of the first part 321, i.e., B1 = (D2 - D1) / 2. The width B2 of the third part 323 must ensure that, after assembly, the entire third part 323 completely covers the low-pressure end annular sealing groove 213 (or / and the high-pressure end annular sealing groove 223) of the end stator component 2 in width. Generally, it is taken as 2 to 2.5 times the width of the annular sealing groove. The length L2 of the third part 323 is approximately equal to the length of the contact area between the transition seal 32 and the annular seal 33. The longer the length, the better the sealing performance. However, based on considerations of economy and assembly, it is generally 2 to 3 times the width of the third part.
[0037] Furthermore, each of the three types of seals in sealing assembly 3 has its own corresponding sealing groove for accommodating constraints, including: like Figures 7-8 As shown, the transverse sealing groove 116 is located on the assembly mating surface of the lower housing 11 and the upper housing 12. It is arranged parallel to both sides of the lower rotor blade chamber 111 of the lower housing 11 and parallel to the axis of the rotating shaft. Specifically, it is a straight groove with a square cross-section that transversely penetrates the entire mating surface of the lower housing 11.
[0038] like Figure 9 As shown, there are two annular sealing grooves, namely the low-pressure end annular sealing groove 213 and the high-pressure end annular sealing groove 223, which are arranged on the assembly mating surfaces of their respective end stator components 2 and housing stator components 1.
[0039] like Figures 10-11 As shown, there are four transition sealing grooves 107. They are divided into three parts: a first groove 1071, a second groove 1072, and a third groove 1073. Each of the three grooves is composed of the transition sealing grooves located between the upper housing 12 and the lower housing 11. Specifically: The first groove 1071 is a circle formed by the lower first groove 1171 and the upper first groove 1271, with its center coinciding with the center of the cross-section of the transverse sealing groove 116; the second groove 1072 is an elongated strip formed by the lower second groove 1172 and the upper second groove 1272, with its width direction symmetrically distributed along the mating surface of the upper and lower shells; the third groove 1073 is a rectangle formed by the lower third groove 1173 and the upper third groove 1273, with the two parts symmetrical about the mating surface of the upper and lower shells.
[0040] Furthermore, the installation arrangement of the sealing assembly 3 is as follows; The low-pressure end stator component 21 and the high-pressure end stator component 22 are aligned and assembled on the lower housing 11. A transverse seal 31 is placed in the transverse sealing groove 116 of the lower housing 11 to seal the gap between the mating surfaces of the lower housing 11 and the upper housing 12 of the housing stator component 1 after assembly. An annular seal 33 is placed in the low-pressure end annular sealing groove 213 (or / and the high-pressure end annular sealing groove 223) of the low-pressure end stator component 21 (or / and the high-pressure end stator component 22) to seal the gap between the mating surfaces of the low-pressure end stator component 21 and the high-pressure end stator component 22 and the housing stator component 1 after assembly. A transition seal 32 is placed in the transition sealing groove 107 of the housing stator component 1 (including the lower housing 11 and the upper housing 12).
[0041] After the components are assembled, the transverse seal 31, placed in the transverse sealing groove 116, passes through the transition seal 32 and extends out, with the extended portion being accommodated in the high-pressure end receiving hole 225. The annular seal 33, placed in the high-pressure end annular sealing groove 223, comes into contact with the transition seal 32 through assembly compression.
[0042] Example 2 like Figures 12-15 As shown, another sealing assembly scheme is proposed, which includes a housing seal 34 and an annular seal 33. Wherein: The housing seal 34 integrates the aforementioned transverse seal 31 and transition seal 32 into one unit, thereby lengthening the transverse seal 31. By modifying the transition sealing groove 107 and transverse sealing groove 116 of Embodiment 1 to form a new housing sealing groove, the shape of the housing seal 34 in this design is constrained during assembly, resulting in multiple bends and straight sections to achieve different functions.
[0043] The end of the housing seal 34 includes a first bend 341, a second bend 342, a straight end section 343, and an end head 344. The first bend 341, the second bend 342, and the end head 344 constitute the curved structure at both ends of the housing. At the first bend 341, the seal is tightly attached to the side wall of the housing sealing groove, sealing the space of the housing sealing groove and blocking the leakage channels of the high-pressure auxiliary chamber 105 and the low-pressure auxiliary chamber 104 to a certain extent, thus preventing internal leakage of the pump. The second bend 342 and the end head 344, when fitted together, fix the straight end section 343 in a fixed position during the assembly process to prevent movement. The sealing groove at the straight end section 343 is open, with only one side being the housing and the other side being open, with a width equal to the depth. When the end stator components are assembled, the housing seal 34 at the opening is pressed against the side wall of the sealing groove on the other side to form an effective seal.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.
Claims
1. A sealing assembly for a clamshell-type dry vacuum pump housing, characterized in that, The device includes a housing stator component (1) and an end stator component (2). The housing stator component (1) includes a lower housing (11) and an upper housing (12). A transverse sealing groove (116) is provided at the connection surface between the lower housing (11) and the upper housing (12). Transition sealing grooves (107) are provided at both ends of the transverse sealing groove (116). The end stator component (2) is installed at both ends of the housing stator component (1). An annular sealing groove is provided at the connection between the end stator component (2) and the housing stator component (1). A transverse seal (31) is installed in the transverse sealing groove (116). A transition seal (32) is installed in the transition sealing groove (107). An annular seal (33) is installed in the annular sealing groove. The two ends of the transition seal (32) are respectively connected to the end of the transverse seal (31) and the annular seal (33).
2. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 1, characterized in that, The lower housing (11) includes several axially distributed lower rotor blade chambers (111). The two ends of the lower rotor blade chambers (111) are the lower low-pressure end auxiliary chamber (114) and the lower high-pressure end auxiliary chamber (115), respectively. The lower rotor blade chambers (111) are separated by a lower partition wall (112). The lower partition wall (112) has a lower rotor shaft hole (113) at the top. The lower housing (11) has transverse sealing grooves (116) on both sides of the top of the lower housing (11). The lower housing transition sealing grooves (117) are provided at both ends of the transverse sealing grooves (116).
3. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 2, characterized in that, The upper housing (12) and the lower housing (11) are arranged symmetrically. The upper housing (12) includes an upper rotor blade chamber and an upper partition wall. The two ends of the upper rotor blade chamber are an upper low-pressure end auxiliary chamber (124) and an upper high-pressure end auxiliary chamber (125), respectively. An upper rotor shaft hole (123) is opened at the bottom of the upper partition wall. The upper housing transition sealing groove (127) is provided at both ends of the bottom of the upper housing (12). The position of the upper housing transition sealing groove (127) corresponds to the position of the lower housing transition sealing groove (117).
4. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 3, characterized in that, After the upper shell (12) and the lower shell (11) are assembled, the upper rotor blade chamber and the lower rotor blade chamber (111) form the rotor blade chamber (101), the lower low-pressure end auxiliary chamber (114) and the upper low-pressure end auxiliary chamber (124) together form the low-pressure end auxiliary chamber (104), the lower high-pressure end auxiliary chamber (115) and the upper high-pressure end auxiliary chamber (125) together form the shell end high-pressure end auxiliary chamber (105); the lower shell transition sealing groove (117) and the upper shell transition sealing groove (127) together form the transition sealing groove (107).
5. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 4, characterized in that, The end stator component (2) includes a low-pressure end stator component (21) and a high-pressure end stator component (22); the low-pressure end stator component (21) includes a first auxiliary chamber (211), a low-pressure end shaft hole (212) is opened in the middle of the first auxiliary chamber (211), a low-pressure end annular sealing groove (213) is arranged around the first auxiliary chamber (211), a low-pressure end lateral extension (214) is symmetrically arranged on the low-pressure end annular sealing groove (213), the position of the low-pressure end lateral extension (214) corresponds to the position of the transverse sealing groove (116), and a low-pressure end receiving hole (215) is provided on the low-pressure end lateral extension (214); the structure of the high-pressure end stator component (22) is the same as that of the low-pressure end stator component (21).
6. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 5, characterized in that, The low-pressure end shaft hole (212) is aligned with the shaft hole (103) of the housing stator component (1).
7. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 1, characterized in that, The transition seal (32) is an integrally formed structure, including a first part (321), a second part (322) and a third part (323). The first part (321) is annular with a receiving hole (3211) in the center; the second part (322) is a horizontal strip and the third part (323) is a vertical rectangle. The first part (321) and the third part (323) are connected through the second part (322).
8. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 7, characterized in that, The diameter of the receiving hole (3211) is slightly smaller than the diameter of the transverse seal (31), and the width of the third part (323) is 2 to 2.5 times that of the annular sealing groove.
9. A sealing assembly for a clamshell-type dry vacuum pump housing according to claim 5 or 7, characterized in that, The connection between the transition seal (32) and the transverse seal (31) is as follows: the end of the transverse seal (31) passes through and extends out of the receiving hole (3211) of the transition seal (32), and the protruding part of the transverse seal (31) is fixed in the low-pressure end receiving hole (215).
10. The sealing assembly for a clamshell-type dry vacuum pump housing according to claim 7, characterized in that, The transverse seal (31) and the annular seal (33) are connected by contact and compression after assembly to achieve a sealing connection.