Positioning device suitable for assembling roots pump rotor

Abstract

The utility model discloses a locating device suitable for assembling a rotor of a roots pump, which comprises a locating device used for locating the angle direction between a driving shaft and a driven shaft, the locating device comprises a locating shaft sleeve, a pressing rod detachably extending into or withdrawing from an inner cavity of a pump body, and a gap piece with a flexible characteristic, the positioning shaft sleeve is positioned on the driving shaft on the periphery of the pump body, and is provided with a positioning groove for aligning and clamping a positioning key preformed on the peripheral surface of the driving shaft in a rated angle direction; the clearance piece extends into an inner cavity of the pump body and is arranged between the driving rotor and the driven rotor, and the driven rotor is matched with the driving rotor which is fixed and limited due to the positioning shaft sleeve to clamp and press the clearance piece by screwing the driven shaft; the pressing rod extends into an inner cavity of the pump body to abut against and fix the driven rotor with the gap piece clamped and pressed. Wherein the thickness value of the gap sheet is the gap value between the driving rotor and the driven rotor; therefore, precise adjustment and positioning of the gap between the two rotors of the roots pump are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of Roots pump assembly, in particular to a positioning device suitable for assembling a Roots pump rotor. Background Art

[0002] Roots pump is a vacuum pump without internal compression. Two rotors in the shape of "8" and vertically mounted on a pair of parallel shafts are arranged in the inner cavity of the pump body. The two rotors are driven by a pair of gears with a transmission ratio of 1 to perform synchronous rotation in opposite directions. The gas is sucked from the air inlet into the space between the rotor and the pump housing of the Roots pump through the relative rotation of the two rotors, and then discharged through the exhaust port. Therefore, a certain gap must be maintained between the two rotors to ensure that the two rotors can rotate relative to each other normally without friction or collision. In addition, if the gap between the two rotors is too large, it will affect the pumping speed. If the gap is too small, the two rotors of the Roots pump will compress the gas and generate a large amount of compression heat when rotating relative to each other. The temperature in the inner cavity of the pump body is too high, which seriously affects the safety and reliability of the operation of the Roots pump. Therefore, it is very important to accurately adjust the gap between the two rotors of the Roots pump. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a positioning device suitable for assembling the rotor of a Roots pump. By setting the positioning device, the angular orientation between the driving shaft and the driven shaft is positioned, thereby achieving precise adjustment and positioning of the gap between the two rotors of the Roots pump, thereby improving the operating reliability and assembly efficiency of each rotor of the Roots pump.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a positioning device suitable for assembling a Roots pump rotor, the Roots pump comprises a pump body, a driving shaft and a driven shaft parallel and pivotally connected in the inner cavity of the pump body, and a driving rotor and a driven rotor respectively fixedly sleeved on the driving shaft and the driven shaft, wherein one end of the driving shaft and the driven shaft axially extends through the periphery of the pump body, and comprises a positioning device for positioning the angular orientation between the driving shaft and the driven shaft, the positioning device comprises a positioning sleeve, a pressure rod detachably extending into or withdrawing from the inner cavity of the pump body, and a gap sheet with flexible characteristics, wherein the positioning sleeve is located on the driving shaft outside the pump body, the positioning sleeve is provided with a positioning groove for aligning and clamping the positioning key preformed on the circumferential surface of the driving shaft at a rated angle; the gap sheet extends into the inner cavity of the pump body and is placed between the driving rotor and the driven rotor, and the driven shaft is screwed to make the driven rotor cooperate with the active rotor that is fixed and restricted by the positioning sleeve to clamp the gap sheet; the pressure rod extends into the inner cavity of the pump body to press and fix the driven rotor that has been clamped with the gap sheet.

[0005] Furthermore, the positioning sleeve is also configured with a first fixing plate that is locked and limited with the pump body, wherein the first fixing plate is formed with a first through hole for the positioning sleeve to be embedded and fixed, and the first fixing plate and the pump body are connected through at least one locking screw.

[0006] Furthermore, a first through hole for a locking screw to pass through is formed at both ends of the first fixing plate, and a first threaded hole matched with the locking screw is formed on the pump body at a position opposite to the first through hole.

[0007] Furthermore, the pressure rod is also configured with a second fixing plate that is locked and limited with the pump body, wherein a second threaded hole for the pressure rod to vertically pass through is formed on the second fixing plate, and the thread on the inner wall of the second threaded hole is adapted to the thread on the pressure rod body.

[0008] Furthermore, a second through hole for a locking screw to pass through is formed at both sides of the second fixing plate, and a third threaded hole matched with the locking screw is formed on the pump body at a position opposite to the second through hole.

[0009] Furthermore, it also includes at least two tensioning rings for respectively locking the fixed and restricted active rotor and the driven rotor.

[0010] The utility model adopts the above-mentioned scheme, and its beneficial effect lies in that the positioning of the active rotor is achieved by aligning and clamping the positioning key preformed on the circumferential surface of the active shaft and the positioning groove provided on the positioning sleeve at the rated angle; the precise adjustment of the gap between the two rotors of the Roots pump is achieved by arranging the gap sheet; wherein the thickness value of the gap sheet is the gap value between the active rotor and the driven rotor; the positioning of the driven rotor is achieved by extending the pressure rod into the inner cavity of the pump body to press the driven rotor; the reliability of the operation of each rotor of the Roots pump and the assembly efficiency are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of a Roots pump.

[0012] Figure 2 It is a schematic diagram of the structure before the positioning sleeve and the first fixing plate are assembled.

[0013] Figure 3 It is a schematic diagram of the structure after the positioning sleeve and the first fixing plate are assembled.

[0014] Figure 4 This is a schematic diagram of the structure before the gap piece is assembled.

[0015] Figure 5 This is a schematic diagram of the structure after the gap piece is assembled.

[0016] Figure 6 It is a schematic diagram of the structure before the pressure rod and the second fixed plate are assembled.

[0017] Figure 7 It is a schematic diagram of the structure after the pressure rod and the second fixed plate are assembled.

[0018] Figure 8 This is a schematic diagram of the longitudinal section of the Roots pump.

[0019] Fig. 9 It is a schematic longitudinal section diagram of the positioning sleeve and the first fixing plate after assembly.

[0020] Fig.10 This is a schematic diagram of the longitudinal section after the gap piece is assembled.

[0021] Fig.11 It is a schematic diagram of the longitudinal section after the gap piece, the pressure rod and the second fixing plate are assembled.

[0022] Among them, 1-pump body, 11-inner cavity of pump body, 12-driving shaft, 121-driving rotor, 122-positioning key, 13-driven shaft, 131-driven rotor, 14-first threaded hole, 15-third threaded hole, 2-positioning device, 21-positioning sleeve, 211-positioning groove, 22-pressure rod, 23-gap plate, 24-first fixing plate, 241-first through hole, 242-first through hole, 25-second fixing plate, 251-second threaded hole, 252-second through hole. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention is described more comprehensively with reference to the accompanying drawings. The accompanying drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood. It should be noted that the "first" and "second" described in the present invention do not represent specific quantities and orders, but are only used to distinguish the names.

[0024] This embodiment provides a positioning device suitable for assembling a Roots pump rotor, that is, the positioning device 2 in this embodiment is used to assist the Roots pump rotor in gap adjustment and assembly positioning. Figure 1 and 8 As shown, the Roots pump includes a pump body 1, a driving shaft 12 and a driven shaft 13 which are parallel and pivotally connected in an inner cavity 11 of the pump body, and a driving rotor 121 and a driven rotor 131 which are fixedly sleeved on the driving shaft 12 and the driven shaft 13, respectively, wherein one end of the driving shaft 12 and the driven shaft 13 axially extends through the periphery of the pump body 1, and the driving rotor 121 and the driven rotor 131 rotate synchronously with the driving shaft 12 and the driven shaft 13, respectively; since the structure of the Roots pump is common knowledge to those skilled in the art, it will not be elaborated here.

[0025] See attached Figure 2 , 3 As shown in Figures 9 and 10, in this embodiment, the positioning device 2 is used to position the angle between the driving shaft 12 and the driven shaft 13, and the positioning device 2 includes a positioning sleeve 21, a pressure rod 22 that can be detachably extended into or out of the inner cavity 11 of the pump body, and a gap sheet 23 with flexible characteristics; wherein, the positioning sleeve 21 is located on the driving shaft 12 outside the pump body 1, and the circumferential surface of the driving shaft 12 is preformed with a positioning key 122 corresponding to the impeller position of the driving rotor 121, and the positioning sleeve 21 is provided with a positioning groove 211 for the positioning key 122 to be aligned and engaged at a rated angle. It should be noted that, since different Roots pumps require different pump angles, the angle, specification and number of the positioning groove 211 should be set according to actual assembly requirements; and the positioning sleeve 21 in this embodiment has only one positioning groove 211, and when the positioning sleeve 21 is fixed to the pump body 1, the angle rating of its positioning groove 211 is unique, which is convenient for users to quickly locate and assemble, and is more suitable for mass assembly and production of Roots pumps. During assembly, the driving shaft 12 is screwed so that the positioning key 122 on the circumference of the driving shaft 12 is aligned with the notch of the positioning groove 211 and is snapped into the positioning groove 211. At this time, the driving shaft 12 is fixed by the positioning sleeve 21 and cannot rotate, and the angle of the driving shaft 12 (the angle of the driving rotor 121) is consistent with the angle of the positioning groove 211, thereby realizing the positioning of the driving shaft 12 and the driving rotor 121.

[0026] Specifically, the positioning sleeve 21 in this embodiment is provided with a first fixing plate 24 for fixing to the pump body 1; wherein, the positioning sleeve 21 is embedded and fixed to the first through hole 241 formed in the middle of the first fixing plate 24, and is coaxially sleeved on the driving shaft 12; the first fixing plate 24 moves axially along the driving shaft 12 until it is close to the surface of the pump body 1, and is locked and limited to the periphery of the pump body 1 by at least one locking screw, thereby achieving the fixing of the positioning sleeve 21 to the pump body 1. Furthermore, in order to obtain the best locking effect between the first fixing plate 24 and the pump body 1, a first through hole 242 for the locking screw to pass through and connect is formed at both ends of the first fixing plate 24, and the pump body 1 is formed with a first threaded hole 14 adapted to the locking screw at a position relative to the first through hole 242, and the locking screw cooperates with the first through hole 242 and the first threaded hole 14 to play a role of stable connection.

[0027] See attached Figure 4 , 5As shown in FIG. 10 , in this embodiment, the gap piece 23 is a feeler gauge made of a thin steel sheet and has a certain flexibility (ie, the gap piece 23 can be bent at a certain angle without breaking). The gap sheet 23 extends into the pump body cavity 11 from the upper end of the pump body cavity 11, and bends and extends to be pressed between the active rotor 121 and the driven rotor 131; at this time, the driven rotor 131 is driven to rotate synchronously by screwing the driven shaft 13, so that the driven rotor 131 is pressed against the gap sheet 23; since the active shaft 12 is fixed and limited by the positioning sleeve 21, the active rotor 121 cannot rotate, so that the driven rotor 131 and the active rotor 121 are matched and clamped on the positive and negative sides of the gap sheet 23; wherein, the thickness value of the gap sheet 23 is the gap value between the active rotor 121 and the driven rotor 131 (the thickness value of the gap sheet 23 should be set according to actual assembly requirements); by using gap sheets 23 of different thicknesses, the purpose of changing the gap size between the active rotor 121 and the driven rotor 131 is achieved, and the precise adjustment of the gap between the active rotor 121 and the driven rotor 131 is realized, which greatly improves the reliability of the operation of the Roots pump.

[0028] See attached Figure 6 , 7 As shown in FIG. 11 , in the present embodiment, the pressure rod 22 is a slender steel rod made of steel, which is extended into the pump body cavity 11 from the upper end of the pump body cavity 11 and is vertically pressed and fixed at the upper vertex of the driven rotor 131 which has clamped the gap sheet 23; the pressure rod 22 presses the driven rotor 131 under the action of gravity, thereby effectively limiting the position of the driven rotor 131 and the driven shaft 13, preventing the driven rotor 131 and the driven shaft 13 from rotating, and realizing the positioning of the driven rotor 131 and the driven shaft 13.

[0029] Specifically, the pressure rod 22 in the present embodiment is provided with a second fixing plate 25 for fixing to the pump body 1; wherein the second fixing plate 25 semi-covers and covers the upper port of the inner cavity 11 of the pump body, and is locked and limited with the pump body 1 by at least one locking screw; a second threaded hole 251 for the pressure rod 22 to vertically pass through is formed in the middle position of the second fixing plate 25, and the thread of the inner wall of the second threaded hole 251 is matched with the thread of the rod body of the pressure rod 22 to realize the threaded connection between the pressure rod 22 and the second fixing plate 25, so that the pressure rod 22 can be detachably extended into or withdrawn from the inner cavity 11 of the pump body. Furthermore, in order to obtain the best locking effect between the second fixing plate 25 and the pump body 1, a second through hole 252 for the locking screw to pass through is formed at both sides of the second fixing plate 25, and the pump body 1 is formed with a third threaded hole 15 matched with the locking screw at a position relative to the second through hole, and the locking screw cooperates with the second through hole 252 and the third threaded hole 15 to play a role of stable connection.

[0030] In this embodiment, at least two tensioning rings are also included, and the two tensioning rings are assembly fasteners pre-set at the active rotor 121 and the driven rotor 131 respectively; wherein, when the two rotors are assembled, the tensioning rings are in an unlocked state; after the positioning of the two rotors is completed, the tensioning rings can be locked to lock and fix the active rotor 121 and the driven rotor 131 that have been fixed and restricted; then, the positioning sleeve 21, the pressure rod 22, the first fixing plate 24 and the second fixing plate 25 are loosened and taken out to complete the assembly and positioning of the two rotors of the Roots pump.

[0031] The embodiments described above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any technician familiar with the field, without departing from the scope of the technical solution of the present invention, can make more possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or the modifications are equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the idea of ​​the present invention without departing from the content of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning device suitable for assembling a Roots pump rotor, the Roots pump comprising a pump body (1), a driving shaft (12) and a driven shaft (13) parallel and pivotally connected in an inner cavity (11) of the pump body, and a driving rotor (121) and a driven rotor (131) respectively fixedly sleeved on the driving shaft (12) and the driven shaft (13), wherein: One end of the driving shaft (12) and the driven shaft (13) axially extends through the periphery of the pump body (1), and is characterized in that it includes a positioning device (2) for positioning the angular orientation between the driving shaft (12) and the driven shaft (13), the positioning device (2) including a positioning sleeve (21), a pressure rod (22) that can be detachably extended into or out of the inner cavity (11) of the pump body, and a gap sheet (23) with flexible characteristics, wherein the positioning sleeve (21) is located on the driving shaft (12) outside the pump body (1), and the positioning sleeve (21) is at a rated angle. A positioning groove (211) is provided in the direction for the positioning key (122) preformed on the circumference of the driving shaft (12) to be aligned and engaged; the gap sheet (23) extends into the inner cavity (11) of the pump body and is placed between the driving rotor (121) and the driven rotor (131); the driven shaft (13) is screwed so that the driven rotor (131) cooperates with the driving rotor (121) that is fixed and restricted by the positioning sleeve (21) to clamp the gap sheet (23); the pressure rod (22) extends into the inner cavity (11) of the pump body to press and fix the driven rotor (131) that has been clamped with the gap sheet (23).

2. A positioning device suitable for assembling a Roots pump rotor according to claim 1, characterized in that: The positioning sleeve (21) is further provided with a first fixing plate (24) which is locked and limited with the pump body (1), wherein the first fixing plate (24) is formed with a first through hole (241) for the positioning sleeve (21) to be embedded and fixed, and the first fixing plate (24) and the pump body (1) are connected through at least one locking screw.

3. A positioning device suitable for assembling a Roots pump rotor according to claim 2, characterized in that: A first through hole (242) for a locking screw to pass through is formed at both ends of the first fixing plate (24), and a first threaded hole (14) adapted to the locking screw is formed on the pump body (1) at a position opposite to the first through hole (242).

4. A positioning device suitable for assembling a Roots pump rotor according to claim 1, characterized in that: The pressure rod (22) is further provided with a second fixing plate (25) which is locked and limited with the pump body (1), wherein a second threaded hole (251) is formed on the second fixing plate (25) for the pressure rod (22) to vertically penetrate, and the thread on the inner wall of the second threaded hole (251) is adapted to the thread on the shaft of the pressure rod (22).

5. A positioning device suitable for assembling a Roots pump rotor according to claim 4, characterized in that: A second through hole (252) for a locking screw to pass through is formed at two sides of the second fixing plate (25), and a third threaded hole (15) adapted to the locking screw is formed on the pump body (1) at a position opposite to the second through hole.

6. A positioning device suitable for assembling a Roots pump rotor according to claim 1, characterized in that: It also includes at least two tensioning rings for respectively locking the fixed and restricted active rotor (121) and the driven rotor (131).

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