Vacuum pump

Abstract

The utility model relates to a vacuum pump which comprises a shell, a first rotor and a second rotor. The shell comprises a first shell and a second shell; a rotor cavity is formed between the first shell and the second shell, and an opening is formed in the first shell; the second shell covers the opening; the first rotor and the second rotor are at least partially mounted in the first shell; the first rotor is parallel to the central axis of the second rotor and is spaced from the first rotor; the opening faces the gap between the second rotor and the first rotor to measure the gap between the second rotor and the first rotor through the opening. According to the vacuum pump, the opening is formed in the first shell body of the outer shell, the second shell body covers the opening, the opening faces the gap between the first rotor and the second rotor, then the gap between the rotors and / or the gap between the rotors and the shell bodies can be adjusted through the opening, and therefore the gap error is reduced.

Description

Technical Field

[0001] The utility model relates to the field of power equipment, in particular to a vacuum pump. Background Art

[0002] In vacuum pumps, the gap between adjacent rotor supports and the gap between the rotor and housing require precise control during design, processing, and installation. Excessive gaps can cause compressed gas in the vacuum pump to flow back from the high-pressure area to the low-pressure area, degrading pump performance. Excessive gaps can cause friction or even jamming if the thermal deformation of the rotor and housing exceeds the required clearance. Currently, effectively controlling the gap size and accuracy during assembly remains a major challenge.

[0003] During the installation process of existing vacuum pumps, the gap between the two rotors is usually adjusted on a workbench before the two rotors are installed into the rotor cavity of the housing. This solution is not only complex, requiring the two rotors to be moved to the workbench for gap adjustment before installation, but also requires further movement and installation after the gap adjustment, which can cause the gap between the rotors to deviate. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an improved vacuum pump.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing a vacuum pump, including a housing, a first rotor and a second rotor;

[0006] The housing includes a first shell and a second shell; a rotor cavity is formed between the first shell and the second shell, the first shell is provided with an opening; the second shell covers the opening;

[0007] The first rotor and the second rotor are at least partially mounted in the first housing; the first rotor is parallel to the central axis of the second rotor and is spaced apart from the first rotor;

[0008] The opening faces the gap between the second rotor and the first rotor, so that the gap between the second rotor and the first rotor is measured through the opening.

[0009] In some embodiments, the first housing includes a first side wall and a second side wall; the second side wall is parallel to and opposite to the first side wall; the rotor cavity is formed between the first side wall and the second side wall;

[0010] The opening is opened on the first side wall.

[0011] In some embodiments, the second shell includes an embedding portion embedded in the opening and a limiting portion, and the limiting portion is provided at one end of the embedding portion to fit in the plane where the opening is located.

[0012] In some embodiments, a connection positioning structure is provided on the limiting portion and the first shell;

[0013] The connection positioning structure includes a first positioning hole, a second positioning hole and a positioning pin; the first positioning hole is arranged on the first shell; the second positioning hole is arranged on the limiting part and is arranged one-to-one with the first positioning hole. When the second shell is assembled with the first shell, the positioning pin passes through the first positioning hole into the second positioning hole.

[0014] In some embodiments, the embedded portion is provided with a first limiting structure that cooperates with the first rotor to limit position;

[0015] And / or, the embedded portion is provided with a second limiting structure that cooperates with the second rotor to limit the position.

[0016] In some embodiments, a sealing structure is provided between the first shell and the second shell, and when the second shell covers the opening, the sealing structure is in close contact with the first shell and the second shell.

[0017] In some embodiments, a sealing groove is provided on the first shell, and the sealing groove is provided on the outer ring of the opening for installation of the sealing structure.

[0018] In some embodiments, the vacuum pump further includes a fastening structure, wherein the fastening structure is provided on the first shell and the second shell for fastening the first shell and the second shell;

[0019] And / or, an air intake structure is provided on the second shell.

[0020] In some embodiments, the first shell is a through-end structure;

[0021] The vacuum pump further includes a first end cover and a second end cover; the first end cover is detachably disposed at one end of the first shell; the second end cover is detachably disposed at the other end of the first shell.

[0022] In some embodiments, the first end cover is provided with a first mounting hole for mounting the first rotor and a second mounting hole for mounting the second rotor;

[0023] And / or, the second end cover is provided with a third mounting hole for mounting the first rotor and a fourth mounting hole for mounting the second rotor.

[0024] The implementation of the vacuum pump of the utility model has the following beneficial effects: the vacuum pump is provided with an opening on the first shell of the outer shell, and the second shell is covered with the opening, and the opening is provided toward the gap between the first rotor and the second rotor, and then the gap between the rotors and / or the gap between the rotor and the shell can be adjusted through the opening, thereby reducing the gap error, and eliminating the step of pre-adjusting the gap before assembling the rotor and the outer shell, thereby ensuring the installation accuracy while reducing the assembly workload, improving the installation efficiency and accuracy, and making the subsequent maintenance work more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0026] Figure 1 It is a schematic structural diagram of a vacuum pump in some embodiments of the present invention;

[0027] Figure 2 yes Figure 1 A cross-sectional view of the vacuum pump shown;

[0028] Figure 3 yes Figure 1 Another cross-sectional view of the vacuum pump shown;

[0029] Figure 4 yes Figure 1 A schematic diagram of the partial structure of the vacuum pump shown;

[0030] Figure 5 yes Figure 4 The enlarged schematic diagram of the structure of the vacuum pump at point A is shown;

[0031] Figure 6 yes Figure 4 A top view of the vacuum pump shown;

[0032] Figure 7 yes Figure 4 A top view of the first housing of the vacuum pump;

[0033] Figure 8 yes Figure 1 A schematic structural diagram of a second housing of the vacuum pump shown;

[0034] Figure 9 yes Figure 8 Another perspective structural diagram of the second housing is shown;

[0035] Figure 10 yes Figure 8 A cross-sectional view of the second housing is shown. DETAILED DESCRIPTION

[0036] In order to provide a clearer understanding of the technical features, objectives, and effects of the present invention, a specific embodiment of the present invention is now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "upper," "inner," "outer," etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. These directions are merely for the purpose of facilitating the description of the present invention and do not require that the devices or components referred to have specific directions. Therefore, they should not be construed as limitations on the present invention.

[0037] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0038] Figure 1 Some preferred embodiments of the vacuum pump of the utility model are shown. The vacuum pump has the advantages of simple structure, easy assembly, high precision and easy maintenance.

[0039] like Figures 1 to 3 As shown, in some embodiments, a vacuum pump may include a housing 10, a first rotor 20, and a second rotor 30. The housing 10 may be configured to accommodate the first rotor 20 and the second rotor 30. The first rotor 20 and the second rotor 30 are at least partially disposed within the housing 10. The first rotor 20 may be a driving rotor and may be connected to a drive device. The second rotor 30 may be a driven rotor that drives the driven rotor to rotate. In other embodiments, the first rotor 20 may be a driven rotor and the second rotor 30 may be a driving rotor. In some embodiments, the first rotor 20 and the second rotor 30 may be screws.

[0040] In some embodiments, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are separate structures, and the first housing 11 and the second housing 12 are detachably connected. The use of a separate housing 10 can reduce the workload of secondary processing of the housing 10 and reduce the risk of the housing 10 being unusable due to secondary errors.

[0041] like Figures 4 to 7 As shown, in some embodiments, the inner side of the first shell 11 is hollow, forming a rotor cavity 110. The first shell 11 is a through-structure at both ends, that is, the rotor cavity 110 is a rotor cavity 110 with two through-structures. In some embodiments, the first shell 11 may include a first sidewall 111, a second sidewall 112, a third sidewall 113, and a fourth sidewall 114. The first sidewall 111 and the second sidewall 112 are arranged opposite and parallel to each other. The third sidewall 113 and the fourth sidewall 114 are arranged on opposite sides of the first sidewall 111 and are both connected to the first sidewall 111 and the second sidewall 112. The rotor cavity 110 can be defined by the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 114.

[0042] In some embodiments, the first shell 11 is provided with an opening 1111. Specifically, the opening 1111 is opened on the first side wall 111 and is arranged parallel to the second side wall 112. In some embodiments, the opening 1111 may be roughly rectangular. Of course, it can be understood that in some other embodiments, the opening 1111 may not be limited to a rectangular shape. In some embodiments, the first shell 11 is provided with a sealing groove 1112. The sealing groove 1112 is located on the outer circle of the opening 1111, is arranged on the first side wall 111, and can be arranged along the circumference of the opening 1111. In some embodiments, a first positioning hole 1113 may be provided on the first side wall 111. The first positioning hole 1113 may be one or more. In some embodiments, there are two first positioning holes 1113, and the two first positioning holes 1113 may be arranged corresponding to the two diagonally opposite corners of the opening 1111. In some embodiments, a first connecting through hole 1114 may be provided on the first sidewall 111 . There may be a plurality of first connecting through holes 1114 , and the plurality of first connecting through holes 1114 may be spaced apart along the circumference of the opening 1111 .

[0043] In some embodiments, a first receiving groove 1121 and a second receiving groove 1122 are provided on the inner side of the second sidewall 112. The first receiving groove 1121 and the second receiving groove 1122 may extend along a first direction of the first housing 11. The first receiving groove 1121 and the second receiving groove 1122 may be arranged side by side along a second direction of the first housing 11. In some embodiments, an exhaust port 1123 is provided on the second sidewall 112. The exhaust port 1123 may be located between the first receiving groove 1121 and the second receiving groove 1122 and disposed near one end of the first housing 11.

[0044] In some embodiments, the first rotor 20 is at least partially mounted in the first housing 11 and can extend along a first direction of the first housing 11, that is, along the length of the first sidewall 111. The second rotor 30 is at least partially mounted in the second housing 12 and can extend along the first direction of the second housing 12, that is, along the length of the first sidewall 111. The central axes of the first rotor 20 and the second rotor 30 are arranged parallel to each other. The first rotor 20 and the second rotor 30 can be spaced apart along the second direction of the first housing 11, that is, they can be spaced apart along the width of the first sidewall 111. An opening 1111 is provided toward the gap between the first rotor 20 and the second rotor 30 to facilitate adjustment of the gap therebetween.

[0045] like Figure 2 、 Figure 3 、 Figures 8 to 10 As shown, in some embodiments, the second housing 12 is provided with a removable cover opening 1111, thereby sealing the opening 1111. By providing the opening 1111 and then providing the second housing 12 to removably cover the opening 1111, after the first rotor 20 and the second rotor 30 are installed in the rotor cavity 110, the gap between the rotors and / or the gap between the rotor and the housing can be adjusted through the opening 1111, thereby reducing the gap error. After the gap adjustment is completed, the second housing 12 can be closed. In some embodiments, the step of pre-adjusting the gap before assembling the rotor and the housing can be eliminated, ensuring installation accuracy while reducing assembly workload and improving installation efficiency and accuracy. Furthermore, the opening 1111 also facilitates subsequent maintenance. In some embodiments, the total volume of the second housing 12 is smaller than that of the first housing 11, thereby ensuring the overall rigidity of the first housing 11 after connection with the first end cap 70 and the second end cap 80, and improving assembly accuracy during the assembly process.

[0046] In some embodiments, the second shell 12 may include an embedding portion 121 and a limiting portion 122. The embedding portion 121 may be embedded from the opening 1111, and its cross-sectional shape and size may be adapted to the cross-sectional shape and size of the opening 1111, thereby preventing leakage and turbulence of the compressed gas in the rotor chamber 110 when the rotor is working. In some embodiments, the cross-section of the embedding portion 121 may be roughly rectangular. The limiting portion 122 is provided at one end of the embedding portion 121, and the cross-sectional shape of the limiting portion 122 may be adapted to the cross-sectional shape of the opening 1111. In some embodiments, the limiting portion 122 may be rectangular, which may block the opening 1111 and fit in with the plane where the opening 1111 is located. Specifically, it may fit in with the first side wall 111, thereby limiting the embedding portion 121.

[0047] In some embodiments, the embedded portion 121 is provided with a first limiting structure 1211. This first limiting structure 1211 may be provided on the end surface of the embedded portion 121 facing the first rotor 20. The first limiting structure 1211 may be a limiting groove. The first limiting structure 1211 can cooperate with the first rotor 20 to limit the position. The first limiting structure 1211 may extend along the length of the embedded portion 121. In other embodiments, the first limiting structure 1211 may be omitted.

[0048] In some embodiments, the embedded portion 121 is provided with a second limiting structure 1212. This second limiting structure 1212 may be provided on the end surface of the embedded portion 121 facing the second rotor 30. In some embodiments, the second limiting structure 1212 may be a limiting groove. The second limiting structure 1212 cooperates with the second rotor 30 to limit the position. The second limiting structure 1212 may be arranged side by side with the first limiting structure 1211 in the width direction of the embedded portion 121. In other embodiments, the second limiting structure 1212 may be omitted.

[0049] In some embodiments, the limiting portion 122 may be provided with a second positioning hole 1221, which may correspond one-to-one with the first positioning hole 1113. In some embodiments, there may be two second positioning holes 1221, which may be provided at two diagonally opposite corners of the limiting portion 122.

[0050] In some embodiments, a second connecting through hole 1222 may be provided on the limiting portion 122 . There may be multiple second connecting through holes 1222 . The multiple second connecting through holes 1222 may be arranged at circumferential intervals along the limiting portion 122 and correspond one-to-one to the first connecting through holes 1114 .

[0051] In some embodiments, an air intake structure 123 is provided on the second shell 12. The air intake structure 123 can be provided on the limiting portion 122 and extend to the embedded portion 121. The air intake structure 123 can be an air intake hole, which is provided on one side close to the limiting portion 122 and penetrates the embedded portion 121 along the thickness direction of the limiting portion 122. The air intake structure 123 can be provided between the first limiting structure 1211 and the second limiting structure 1212. When the second shell 12 is covered with the opening 1111, external air can enter the rotor cavity 110 from the air intake structure 123 and then be discharged from the exhaust port 1123. The air intake structure 123 is directly provided on the second shell 12, which can reduce the secondary processing requirements of the outer shell 10 and reduce the impact of processing errors on overall performance.

[0052] In some embodiments, a sealing structure 40 is provided between the first shell 11 and the second shell 12. The first shell 11 and the second shell 12 can be sealedly connected by the sealing structure 40. When the second shell 12 covers the opening 1111, the sealing structure can be in close contact with the first shell 11 and the second shell 12, thereby achieving sealing. In some embodiments, the sealing structure 40 can be embedded and installed in the sealing groove 1112 of the first shell 11, thereby reducing the difficulty of installation. When the first shell 11 and the second shell 12 are covered, the sealing structure 40 is provided on the outer periphery of the embedded portion 121 and is in close contact with the limiting portion 122. In some embodiments, the sealing structure 40 can be a sealing ring.

[0053] In some embodiments, a connection and positioning structure 50 is provided on the stopper 122 and the first housing 11. The connection and positioning structure 50 may include a first positioning hole 1113, a second positioning hole 1221, and a positioning pin. When the second housing 12 is assembled with the first housing 11, the positioning pin can pass through the first positioning hole 1113 and into the second positioning hole 1221 to position the second housing 12 with the first housing 11, thereby maintaining the same assembly position and reducing errors.

[0054] In some embodiments, the vacuum pump further includes a fastening structure 60 disposed on the first housing 11 and the second housing 12 for fastening the first housing 11 and the second housing 12. In some embodiments, when the second housing 12 covers the opening 1111, the fastening structure 60 can be passed through the second connecting through-hole 1222 and into the first connecting through-hole 1114 to be connected and fixed thereto. In some embodiments, the fastening structure 60 can be a screw.

[0055] In some embodiments, when assembling the second housing 12 and the first housing 11, they can first be positioned using the connection and positioning structure 50, then connected to the first housing 11 using the fastening structure 60. Finally, the rotor chamber 110 and the intake and exhaust ports can be fabricated using an integrated manufacturing process. This ensures the sealing and integrity of the rotor chamber 110, improving the operating efficiency and stability of the device. In some embodiments, the connection between the first and second housings 11, 12 can also be reinforced using high-strength bolts or welding to ensure the stability of the overall structure.

[0056] In some embodiments, the vacuum pump further includes a first end cap 70 and a second end cap 80. The first end cap 70 is detachably mounted on one end of the first housing 11. The second end cap 80 is detachably mounted on the other end of the second housing 12. The first end cap 70 and the first housing 11 can be connected and fixed by a first screw assembly. The second end cap 80 and the first housing 11 can be connected and fixed by a second screw assembly.

[0057] In some embodiments, the first end cap 70 may be provided with a first mounting hole 71 and a second mounting hole 72. The first mounting hole 71 and the second mounting hole 72 may be spaced apart along the second direction of the first housing 11. The second end cap 80 may be provided with a third mounting hole 81 and a fourth mounting hole 82. The third mounting hole 81 and the fourth mounting hole 82 may be spaced apart along the second direction of the first housing 11. The third mounting hole 81 is provided to correspond to the first mounting hole 71 and is used for mounting the first rotor 20. The fourth mounting hole 82 is provided to correspond to the second mounting hole 72 and is used for mounting the second rotor 30.

[0058] During the installation of the first rotor 20 and the second rotor 30, the step of pre-adjusting the gap between the rotors can be omitted. The gap adjustment can be performed before the second housing 12 is closed with the opening 1111. The gap between the first rotor 20 and the second rotor 30 can be directly adjusted in the rotor cavity 110 through the opening 1111. The first rotor 20 and the second rotor 30 can be debugged. After the debugging is completed, the second housing 12 and the first housing 11 can be positioned, assembled, and fastened. This can reduce the possibility of errors, improve installation efficiency and accuracy, and make subsequent maintenance work more convenient.

[0059] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A vacuum pump, characterized in that: It comprises a housing (10), a first rotor (20), and a second rotor (30); The housing (10) comprises a first shell (11) and a second shell (12); a rotor cavity (110) is formed between the first shell (11) and the second shell (12); an opening (1111) is provided on the first shell (11); and the second shell (12) covers the opening (1111); The first rotor (20) and the second rotor (30) are at least partially installed in the first housing (11); the central axes of the first rotor (20) and the second rotor (30) are parallel and spaced apart from the first rotor (20); The opening (1111) faces the gap between the second rotor (30) and the first rotor (20), so that the gap between the second rotor (30) and the first rotor (20) can be measured through the opening (1111).

2. The vacuum pump according to claim 1, characterized in that The first housing (11) comprises a first side wall (111) and a second side wall (112); the second side wall (112) is arranged opposite to the first side wall (111); the rotor cavity (110) is formed between the first side wall (111) and the second side wall (112); The opening (1111) is opened on the first side wall (111).

3. The vacuum pump according to claim 2, characterized in that The second shell (12) comprises an embedding portion (121) embedded in the opening (1111) and a limiting portion (122), wherein the limiting portion (122) is arranged at one end of the embedding portion (121) to fit the plane where the opening (1111) is located.

4. The vacuum pump according to claim 3, characterized in that A connection positioning structure is provided on the limiting portion (122) and the first shell (11); The connection positioning structure comprises a first positioning hole (1113), a second positioning hole (1221) and a positioning pin; the first positioning hole (1113) is provided on the first shell (11); the second positioning hole (1221) is provided on the limiting portion (122) and is provided in a one-to-one correspondence with the first positioning hole (1113); when the second shell (12) and the first shell (11) are assembled, the positioning pin passes through the first positioning hole (1113) and into the second positioning hole (1221).

5. The vacuum pump according to claim 3, characterized in that The embedded portion (121) is provided with a first limiting structure (1211) that cooperates with the first rotor (20) to limit the position; And / or, the embedded portion (121) is provided with a second limiting structure (1212) that cooperates with the second rotor (30) to limit the position.

6. The vacuum pump according to claim 1, wherein A sealing structure (40) is provided between the first shell (11) and the second shell (12); when the second shell (12) covers the opening (1111), the sealing structure (40) is in close contact with the first shell (11) and the second shell (12).

7. The vacuum pump according to claim 6, characterized in that A sealing groove (1112) is provided on the first shell (11), and the sealing groove (1112) is provided on the outer ring of the opening (1111) and is used for installing the sealing structure (40).

8. The vacuum pump according to claim 1, wherein The vacuum pump further comprises a fastening structure (60), wherein the fastening structure (60) is arranged on the first shell (11) and the second shell (12) and is used for fastening the first shell (11) and the second shell (12); And / or, an air intake structure (123) is provided on the second shell (12).

9. The vacuum pump according to claim 1, wherein The first shell (11) is a through-structure at both ends; The vacuum pump further comprises a first end cover (70) and a second end cover (80); the first end cover (70) is detachably arranged at one end of the first shell (11); and the second end cover (80) is detachably arranged at the other end of the first shell (11).

10. The vacuum pump according to claim 9, characterized in that The first end cover (70) is provided with a first mounting hole (71) for mounting the first rotor (20) and a second mounting hole (72) for mounting the second rotor (30); And / or, the second end cover (80) is provided with a third mounting hole (81) for mounting the first rotor (20) and a fourth mounting hole (82) for mounting the second rotor (30).

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