Primary rotor of two-stage rotary vane pump

Abstract

The utility model provides a first-stage rotor of a two-stage rotary vane pump, the first-stage rotor comprises a rotor main body and a motor side projecting shaft, a first-stage rotary vane groove is formed in the rotor main body, a first-stage rotary vane is correspondingly inserted into each of the two ends of the first-stage rotary vane groove, a shaft shoulder is processed at one end of the motor side projecting shaft, an oil hole is formed in the shaft shoulder, and a first-stage rotary vane is inserted into the first-stage rotary vane groove. The oil hole is communicated with the first-stage rotary vane groove; the rotor body comprises a motor side end face, and lubricating oil in the oil holes is thrown out of the oil holes under the action of centrifugal force so as to lubricate the motor side end face. The problem that the motor side end face is not lubricated due to uneven pump oil distribution possibly caused by the fact that the rotor body is long is avoided, and meanwhile the phenomenon that the motor side end face and a bearing are not lubricated in time at the moment that the pump is started is avoided, and abrasion and car holding are caused.

Description

Technical Field

[0001] The present application belongs to the technical field of vacuum pumps, and specifically relates to a first-stage rotor of a two-stage rotary vane pump. Background Art

[0002] A rotary vane oil-sealed mechanical pump, also known as a rotary vane pump, is a variable-displacement gas transmission vacuum pump and one of the most fundamental vacuum-generating devices in vacuum technology. A rotary vane pump primarily consists of a pump body, rotor, vanes, and end caps. The rotor is eccentrically mounted within the pump body, its outer diameter tangent to the inner surface. The rotor is slotted, housing the vanes. As the rotor rotates, centrifugal force forces the vanes into constant contact with the pump body, allowing them to slide along the inner wall. A two-stage rotary vane pump typically has two vanes per stage, dividing the crescent space into three sections. As the rotor rotates, gas is drawn in through the inlet and discharged through the exhaust.

[0003] The rotor body of a two-stage rotary vane pump is generally a split structure, that is, the entire rotor consists of rotor shafts at both ends and a rotor part in the middle, which are connected by screws and pins, and has high requirements for manufacturing and assembly.

[0004] The rotor body of the relevant two-stage rotary vane pump generally has simple vane grooves. After the pump oil enters the first cylinder from the second cylinder, it passes through the crescent space and the gap between the two vanes and enters the motor side from the second cylinder side. If the rotor is long, it may cause uneven distribution of pump oil, resulting in insufficient lubrication of the rotor end face on the motor side. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present application is to provide a first-stage rotor of a two-stage rotary vane pump to solve at least one of the above-mentioned problems existing in the prior art.

[0006] In order to solve the above problems, the present application provides a first-stage rotor of a two-stage rotary vane pump, wherein the first-stage rotor includes a rotor body and a motor-side extending shaft, the rotor body is provided with a first-stage rotary vane groove, and a first-stage rotary vane is inserted into each end of the first-stage rotary vane groove, and one end of the motor-side extending shaft is processed with a shaft shoulder, and the shaft shoulder is provided with an oil hole, and the oil hole is connected to the first-stage rotary vane groove;

[0007] The rotor body includes a motor side end surface, and the lubricating oil in the oil hole is thrown out from the oil hole under the action of centrifugal force to lubricate the motor side end surface.

[0008] Optionally, the oil hole is an obliquely arranged hole.

[0009] Optionally, the oil hole includes a first end and a second end, and the shoulder of the motor-side extending shaft includes a first end face and a second end face, the first end is an end close to the axis center of the motor-side extending shaft, and is located on the first end face of the shoulder of the motor-side extending shaft, and the second end is an end away from the axis center of the motor-side extending shaft, and is located on the second end face of the shoulder of the motor-side extending shaft.

[0010] Optionally, a process hole is machined on the second end surface of the shaft shoulder of the motor-side extending shaft, the process hole extends toward the first end of the shaft shoulder, and the oil hole is connected to the process hole.

[0011] Optionally, the first-stage rotor also includes a shaft extending from the second-stage cylinder side, and the rotor body also includes an end face on the second-stage cylinder side. The end face on the second-stage cylinder side of the rotor body is provided with the shaft extending from the second-stage cylinder side, and the end face on the motor side of the rotor body is provided with the shaft extending from the motor side. The shaft extending from the second-stage cylinder side, the rotor body and the shaft extending from the motor side are an integrally formed structure.

[0012] Optionally, an oil groove is provided on the groove wall of the first-stage vane groove, and lubricating oil is provided in the oil groove;

[0013] The lubricating oil in the oil groove flows radially under the action of centrifugal force to lubricate the surface of the first-stage rotor blade to which the oil groove is attached and the edge of the first-stage rotor blade.

[0014] Optionally, the oil groove extends along the axial direction of the rotor body and is equal in length to the first-stage vane groove.

[0015] Optionally, the surface where the oil groove is located is arranged to fit the surface where the radial oil groove on the first-stage rotating vane is located.

[0016] Optionally, there are two oil grooves, one oil groove is correspondingly opened on each groove wall of the first-stage vane groove, and the two oil grooves are centrally symmetrically arranged with the axis of the rotor body as the center.

[0017] Optionally, the outer peripheral surface of the shaft extending from the secondary cylinder side includes an oil pump surface and an oil seal contact surface, the oil seal contact surface is made by surface high-frequency quenching treatment, and the diameter of the oil seal contact surface is larger than the diameter of the oil pump surface.

[0018] Beneficial effects

[0019] The first-stage rotor of the two-stage rotary vane pump provided in the embodiment of the present invention is provided with an oil hole on the motor-side extending shaft of the first-stage rotor, the oil hole being connected to the first-stage rotary vane groove of the rotor body, the lubricating oil in the first-stage rotary vane groove flows from the second-stage cylinder-side end face to the motor-side end face, and part of the lubricating oil flows into the oil hole. Driven by the centrifugal force generated by the rotation of the rotor body, the lubricating oil is thrown out from the oil hole to lubricate the motor-side end face, thereby avoiding uneven distribution of pump oil due to the long rotor body, resulting in insufficient lubrication of the motor-side end face, and also avoiding untimely lubrication of the motor-side end face and bearings at the moment of pump startup, resulting in wear and car-binding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of the first-stage rotor of a two-stage rotary vane pump according to an embodiment of the present application;

[0021] Figure 2 A side view of a first-stage rotor of a two-stage rotary vane pump according to an embodiment of the present application;

[0022] Figure 3 This is a cross-sectional view of the first-stage rotor of a two-stage rotary vane pump according to an embodiment of the present application.

[0023] The reference numerals indicate:

[0024] 1. Oil pump vane groove; 2. Oil pump surface; 3. Oil seal contact surface; 4. First-stage vane groove; 5. Oil groove; 6. Second-stage cylinder side end face; 7. First-stage vane; 8. Vane gap; 9. Motor side end face; 10. Process hole; 11. Oil hole. DETAILED DESCRIPTION

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0027] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0029] See also Figures 1 to 3 As shown, according to an embodiment of the present application, a first-stage rotor of a two-stage rotary vane pump is provided. The first-stage rotor includes a rotor body and a motor-side extending shaft. The rotor body is provided with a first-stage rotary vane slot 4, with a first-stage rotary vane 7 inserted into each end of the first-stage rotary vane slot 4. One end of the motor-side extending shaft is machined with a shaft shoulder, which is provided with an oil hole 11, which is connected to the first-stage rotary vane slot 4.

[0030] The rotor body includes a motor-side end surface 9 . Lubricating oil in the oil hole 11 is thrown out from the oil hole 11 under the action of centrifugal force to lubricate the motor-side end surface 9 .

[0031] An oil hole 11 is provided on the shoulder of the shaft extending from the motor side of the first-stage rotor. The oil hole 11 is connected to the first-stage vane groove 4 of the rotor body. The lubricating oil in the first-stage vane groove 4 flows from the second-stage cylinder side end face 6 to the motor side end face 9. Part of the lubricating oil flows into the oil hole 11. Driven by the centrifugal force generated by the rotation of the rotor body, the lubricating oil is thrown out from the oil hole 11 to lubricate the motor side end face 9. This avoids the uneven distribution of pump oil caused by the long rotor body, resulting in insufficient lubrication of the motor side end face 9. At the same time, it also avoids the untimely lubrication of the motor side end face 9 and the bearing at the moment of pump startup, which causes wear and car sticking.

[0032] Among them, the first-stage vane slot 4 is a through slot opened along the diameter direction of the rotor body, and its length is the same as that of the rotor body; a first-stage vane 7 is inserted into each end of the first-stage vane slot 4, and a spacing distance is set between the two first-stage vanes 7. The spacing distance forms a vane gap 8. The vane gap 8 is the main oil pump passage. The vane gap 8 is connected to the oil hole 11 to allow the lubricating oil in the vane gap 8 to be passed into the oil hole 11.

[0033] The oil hole 11 is an inclined hole so as to adapt to the centrifugal force generated by the rotation of the rotor body, and smoothly throw out the lubricating oil in the oil hole 11 to lubricate the motor side end face 9.

[0034] The oil hole 11 includes a first end and a second end, and the shoulder of the motor-side extending shaft includes a first end face and a second end face. The first end is an end close to the axis of the motor-side extending shaft and is located on the first end face of the shoulder of the motor-side extending shaft. The second end is an end away from the axis of the motor-side extending shaft and is located on the second end face of the shoulder of the motor-side extending shaft.

[0035] Among them, the first end face and the second end face of the shoulder of the motor-side protruding shaft are two end faces arranged opposite to each other. Here, the oil hole 11 is arranged on the shoulder, the first end is close to the axis of the motor-side protruding shaft, and is located on the first end face of the shoulder of the motor-side protruding shaft, and the second end is away from the axis of the motor-side protruding shaft, and is located on the second end face of the shoulder of the motor-side protruding shaft. That is to say, in fact, the length of the oil hole 11 is greater than the width of the shoulder, and extends from the side close to the axis of the motor-side protruding shaft to the outer peripheral surface of the shoulder of the motor-side protruding shaft, so as to facilitate the lubricating oil in the rotor gap 8 to be drawn out from the second end located on the second end face to lubricate the motor-side end face 9 of the rotor body.

[0036] A process hole 10 is machined on the second end face of the shaft shoulder extending from the motor side. The process hole 10 extends toward the first end of the shaft shoulder. The oil hole 11 is connected to the process hole 10. The opening of the process hole 10 facilitates the machining of the oil hole 11.

[0037] There are two process holes 10 , which are symmetrically arranged with the axis of the shaft extending from the motor side as the symmetry center. The process holes 10 are symmetrically arranged to ensure that the dynamic balance performance of the first-stage rotor is not affected.

[0038] Specifically, after the lubricating oil in the oil hole 11 is thrown out from the process hole 10, it flows along the shoulder end face and the outer peripheral surface of the shaft extending from the motor side to the motor side end face 9 of the rotor body to lubricate it.

[0039] The first-stage rotor also includes a shaft extending from the second-stage cylinder side, and the rotor body also includes a second-stage cylinder side end face 6. The second-stage cylinder side end face 6 of the rotor body is provided with a shaft extending from the second-stage cylinder side, and the motor side end face 9 of the rotor body is provided with a shaft extending from the motor side. The shaft extending from the second-stage cylinder side, the rotor body and the motor side shaft are an integrated structure.

[0040] Among them, the protruding shaft on the secondary cylinder side, the rotor body and the protruding shaft on the motor side are an integrated molded structure. That is to say, the first-stage rotor is made of a whole piece of ductile iron and does not require assembly. It has high dimensional accuracy, improves assembly efficiency, and has the advantages of reducing costs and increasing efficiency.

[0041] An oil groove 5 is provided on the groove wall of the first-stage vane groove 4, and lubricating oil is provided in the oil groove 5; the lubricating oil in the oil groove 5 flows radially under the action of centrifugal force to lubricate the surface of the first-stage vane 7 in contact with the oil groove 5 and the edge of the first-stage vane 7.

[0042] The oil groove 5 increases the oil passage, increases lubrication between the surface of the first-stage vane 7 and the contact surface of the rotor body, and plays a certain anti-seizing role when dust and particles are mixed in the pump oil.

[0043] Specifically, in this embodiment, the oil groove 5 is a groove with a rectangular cross section, and the opening of the oil groove 5 is arranged toward one side of the primary rotor 7. In other embodiments, the oil groove 5 may also be of other shapes.

[0044] The oil groove 5 extends along the axial direction of the rotor body and has the same length as the first-stage vane groove 4 .

[0045] The oil groove 5 extends along the axial direction of the rotor body and is the same length as the first-stage vane groove 4. That is, the oil groove 5 is provided throughout the entire length of the first-stage vane 7, so that the lubricating oil in the oil groove 5 can lubricate the entire upper surface and edge of the first-stage vane 7, further improving the uniform lubrication effect.

[0046] The surface where the oil groove 5 is located is arranged to fit the surface where the radial oil groove on the first-stage rotor 7 is located.

[0047] The surface of the oil groove 5 is fitted with the surface of the radial oil groove on the first-stage rotor 7 , that is, the radial oil groove of the first-stage rotor 7 is connected to the oil groove 5 , so that the lubricating oil in the arc-shaped oil groove flows into the oil groove 5 .

[0048] There are two oil grooves 5 , one oil groove 5 is correspondingly opened on each groove wall of the first-stage vane groove 4 , and the two oil grooves 5 are centrally symmetrically arranged with the axis of the rotor body as the center.

[0049] Among them, the two oil grooves 5 are centrally symmetrically arranged with the axis of the rotor body as the center, ensuring that the dynamic balance of the first-stage rotor is not affected.

[0050] The specific implementation process is as follows: the rotation of the first-stage rotor generates centrifugal force, and the lubricating oil in the radial oil groove of the first-stage rotor 7 enters the oil groove 5 under the action of centrifugal force. Then, the lubricating oil in the oil groove 5 also flows toward the edge side of the first-stage rotor 7 under the action of centrifugal force, so as to lubricate the entire upper surface and the edge of the first-stage rotor 7 along the entire length.

[0051] The outer peripheral surface of the shaft extending from the secondary cylinder side includes an oil pump surface 2 and an oil seal contact surface 3. The oil seal contact surface 3 is made by surface high-frequency quenching treatment, and the diameter of the oil seal contact surface 3 is larger than the diameter of the oil pump surface.

[0052] The oil seal contact surface 3 is made by high-frequency quenching treatment, which can not only ensure the hardness requirement of the oil seal on the contact surface, but also save the trouble of installing the shaft sleeve.

[0053] Among them, the diameter of the oil seal contact surface 3 is slightly larger than the diameter of the oil pump surface 2. That is to say, the diameter of the oil seal contact surface 3 is designed with a tolerance, so the diameter of the oil seal contact surface 3 is slightly larger than the diameter of the oil pump surface 2, which reduces the overall size and makes the structure more compact.

[0054] Among them, a through oil pump vane groove 1 is processed on the surface 2 of the oil pump along the diameter direction, and the oil pump vane is installed in the oil pump vane groove 1.

[0055] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0056] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A first-stage rotor of a two-stage rotary vane pump, the first-stage rotor comprising a rotor body and a motor-side extending shaft, the rotor body being provided with a first-stage rotary vane slot (4), with a first-stage rotary vane (7) inserted into each of the two ends of the first-stage rotary vane slot (4), characterized in that: One end of the motor-side extended shaft is processed with a shaft shoulder, and an oil hole (11) is opened on the shaft shoulder, and the oil hole (11) is connected to the first-level rotary vane groove (4); The rotor body includes a motor side end surface (9), and the lubricating oil in the oil hole (11) is thrown out from the oil hole (11) under the action of centrifugal force to lubricate the motor side end surface (9).

2. The first-stage rotor of a two-stage rotary vane pump according to claim 1, characterized in that: The oil hole (11) is a hole arranged obliquely.

3. The first-stage rotor of a two-stage rotary vane pump according to claim 2, characterized in that: The oil hole (11) includes a first end and a second end, and the shoulder of the motor-side extending shaft includes a first end surface and a second end surface, the first end is an end close to the axis of the motor-side extending shaft and is located on the first end surface of the shoulder of the motor-side extending shaft, and the second end is an end away from the axis of the motor-side extending shaft and is located on the second end surface of the shoulder of the motor-side extending shaft.

4. The first-stage rotor of a two-stage rotary vane pump according to claim 3, characterized in that: A process hole (10) is machined on the second end surface of the shaft shoulder of the motor-side extending shaft. The process hole (10) extends toward the first end of the shaft shoulder, and the oil hole (11) is connected to the process hole (10).

5. The first-stage rotor of a two-stage rotary vane pump according to claim 1, characterized in that: The first-stage rotor further includes a second-stage cylinder side extending shaft, and the rotor body further includes a second-stage cylinder side end face (6). The second-stage cylinder side end face (6) of the rotor body is provided with the second-stage cylinder side extending shaft, and the motor side end face (9) of the rotor body is provided with the motor side extending shaft. The second-stage cylinder side extending shaft, the rotor body, and the motor side extending shaft are an integrally formed structure.

6. The first-stage rotor of a two-stage rotary vane pump according to claim 1, characterized in that: An oil groove (5) is provided on the groove wall of the first-stage rotary vane groove (4), and lubricating oil is provided in the oil groove (5); the lubricating oil in the oil groove (5) flows radially under the action of centrifugal force to lubricate the surface of the first-stage rotary vane (7) in contact with the oil groove (5) and the edge of the first-stage rotary vane (7).

7. A first-stage rotor of a two-stage rotary vane pump according to claim 6, characterized in that: The oil groove (5) extends along the axial direction of the rotor body and has the same length as the first-stage vane groove (4).

8. The first-stage rotor of a two-stage rotary vane pump according to claim 7, characterized in that: The surface where the oil groove (5) is located is arranged to fit the surface where the radial oil groove on the first-stage rotary vane (7) is located.

9. The first-stage rotor of a two-stage rotary vane pump according to claim 6, characterized in that: There are two oil grooves (5), one of which is correspondingly provided on each groove wall of the first-stage vane groove (4), and the two oil grooves (5) are centrally symmetrically arranged with the axis of the rotor body as the center.

10. The first-stage rotor of a two-stage rotary vane pump according to claim 5, characterized in that: The outer peripheral surface of the shaft extending from the secondary cylinder side includes an oil pump surface (2) and an oil seal contact surface (3); the oil seal contact surface (3) is manufactured by surface high-frequency quenching treatment, and the diameter of the oil seal contact surface (3) is larger than the diameter of the oil pump surface (2).

Images