CN221647161U - Four-leaf Roots vacuum pump - Google Patents

Abstract

The utility model relates to a four-lobe Roots vacuum pump in the field of vacuum pumps, which comprises a pump body and a pump cover, wherein an accommodating cavity is arranged in the pump body, two horizontal rotating shafts are connected in the accommodating cavity, a rotor is connected to the rotating shafts, four raised impeller parts are arranged on the outer surface of the rotor in a surrounding manner, a concave arc-shaped part is arranged between the two impeller parts, a first oil seal and a second oil seal are connected on the rotating shafts in a coaxial manner, and are respectively arranged at two ends of the rotor.

Description

Four-leaf Roots vacuum pump

Technical Field

The utility model relates to the field of vacuum pumps, in particular to a four-leaf Roots vacuum pump.

Background Art

The four-leaf Roots vacuum pump is a mechanical vacuum pump that gradually reduces the volume of the pump chamber during the rotation of a pair of rotors, thereby sucking gas from the air inlet and then exhausting it from the exhaust port. This pump has a high pumping rate and can achieve a high vacuum degree.

Four-leaf Roots vacuum pumps can be used in a variety of industries and fields, such as chemical, pharmaceutical, food, etc. Roots vacuum pumps can provide a stable vacuum environment to ensure the control and efficiency of the reaction. They have a high pumping rate and can quickly pump out the gas, reducing energy consumption. They have a simple structure, stable operation, and low maintenance costs. Therefore, they have high reliability. Four-leaf Roots vacuum pumps are mainly composed of a pump body, a pump cover, a shaft, blades, a rotor, etc. Among them, the pump body and the pump cover are the most important components of the pump, which constitute the working chamber of the pump. The rotor is mounted on the shaft through a bearing, and the blades are fixed to the rotor.

In the existing four-leaf Roots vacuum pump, since the rotor moves at high speed driven by the rotating shaft, the rotor is prone to deviation and deviation, which leads to deviation in the matching of the two rotors, which can easily cause negative pressure leakage in the vacuum pump. Therefore, the rotor shaft seal of the vacuum pump is very important, but the existing seal is only a simple sealing gasket contact fixation, which leads to poor shaft sealing and affects the stability of the rotor, which is not conducive to the stable use of the rotor. In addition, the rotor of the existing Roots vacuum pump is generally designed with a double-impeller or three-impeller structure. During the medium transmission process, its negative pressure stability is relatively poor, which affects the generation of negative pressure gas and affects work efficiency.

Utility Model Content

The purpose of the utility model is to solve the above defects and provide a four-leaf Roots vacuum pump to solve the technical problem that the shaft sealing of the rotor in the Roots vacuum pump in the above background technology is poor, which affects the stable use of the rotor and the negative pressure working efficiency of the rotor.

The purpose of the utility model is achieved by the following methods:

A four-leaf Roots vacuum pump comprises a pump body and a pump cover. A accommodating chamber is provided inside the pump body. Two horizontal rotating shafts are connected in the accommodating chamber. A rotor is coaxially connected to the rotating shaft. Four raised impeller parts are arranged around the outer surface of the rotor. A concave arc part is arranged between the two impeller parts. The arc part is used to cooperate with the impeller part. A first oil seal and a second oil seal are coaxially connected to the rotating shaft. The first oil seal and the second oil seal are respectively arranged at two ends of the rotor and abut against the end face of the rotor. A sealing chamber is provided on the surfaces of the first oil seal and the second oil seal that contact the end face of the rotor. The rotor is coaxially installed in the middle part of the rotating shaft. A sealing protrusion that is closely fitted with the sealing chamber is provided on the rotating shaft. The two ends of the rotating shaft are connected to the inner wall of the accommodating chamber through a rotating member. The inner wall of the accommodating chamber is provided with a mounting groove for fitting and installing the rotating member. One end of the rotating shaft extends to the outside of the pump body through the mounting groove.

Further in the above description, when the two rotors are rotationally matched, the impeller portion rotates along the inner wall of the accommodating chamber under the drive of the rotating shaft, and the impeller portion and the arc portion are rotationally contacted and matched.

Further in the above description, a mounting hole for matching the rotating shaft is provided on the side of the pump body, and the mounting hole is connected with the mounting slot, and a positioning pin groove is provided on the inner wall of the mounting hole, and the positioning pin groove can enhance the stability of the connection with the rotating shaft.

Further in the above description, the rotating member is composed of two rolling bearings, the two rolling bearings are coaxially connected to the rotating shaft, and the two rolling bearings are connected to both ends of the rotating shaft, so that the rotating shaft can be driven to drive the rotor to rotate.

Further in the above description, the pump body is symmetrically provided with an inlet end and an outlet end on the left and right sides, and the adjacent ends of the inlet end and the outlet end are connected with the accommodating cavity in the pump body, and the two rotors rotate relative to each other. The gap between the rotors and between the pump body accommodating cavity and the rotor is only 5 to 10 threads. The rotation speed of the rotor driven by the shaft is very high, so the rotor forms an intake cavity and an exhaust cavity, and is quickly separated, so that the volume of the intake cavity gradually increases, the pressure decreases to form a vacuum, and the volume of the exhaust cavity gradually decreases, the pressure increases to discharge the gas.

Further in the above description, a mounting bracket is provided at the bottom of the pump body, and two mounting brackets are provided and symmetrically arranged. The upper surface of the mounting bracket is provided with a fixing hole for installation, and the two mounting brackets are symmetrical in "L" shape, which is convenient for supporting connection.

Further in the above description, the pump cover is installed on one side of the pump body close to the mounting hole, and the pump cover is connected to the pump body by bolts, a cooling oil pipe is connected to the side of the pump cover, an inner cavity is formed on one side of the pump cover, and the end of the cooling oil pipe is conductively connected to the inner cavity of the pump cover.

The beneficial effects of the utility model are as follows: the four-leaf Roots vacuum pump increases the volume change in the accommodating chamber during rotation through the cooperation of the four raised impeller parts and the concave arc-shaped part, and is conducive to improving the exhaust efficiency under the drive of the rotating shaft, thereby obtaining a higher negative pressure vacuum and improving the working efficiency of the vacuum pump. The first oil seal and the second oil seal are respectively arranged at the two ends of the rotor to enhance the stability of the rotor connection, reduce the ground deviation during rotation, effectively block the gas leakage in the pump chamber, and improve the shaft sealing performance of the rotor and the rotating shaft. The two ends of the rotating shaft are connected to the inner wall of the accommodating chamber through a rotating member, so that the rotating shaft drives the rotor to be more stable during operation, which is conducive to extending the service life of the vacuum pump. The four-leaf Roots vacuum pump of the utility model has a simple structure, stable connection, and is easy to manufacture and maintain.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of a four-leaf Roots vacuum pump according to the present invention from a front perspective;

FIG2 is a perspective view of the utility model four-leaf Roots vacuum pump from a rear view angle;

FIG3 is a right side view of the four-leaf Roots vacuum pump of the utility model;

Fig. 4 is a cross-sectional view along line A-A in Fig. 3;

Fig. 5 is a cross-sectional view along line B-B in Fig. 3;

FIG6 is an exploded view of a four-leaf Roots vacuum pump of the present invention;

The reference numerals in the figure are: 1-pump body, 2-pump cover, 3-accommodating chamber, 4-rotating shaft, 5-rotor, 6-impeller part, 7-arc-shaped part, 8-first oil seal, 9-second oil seal, 10-sealing chamber, 11-sealing protrusion, 12-installing notch, 13-installing hole, 14-locating pin groove, 15-rolling bearing, 16-inlet end, 17-outlet end, 18-installing bracket, 19-cooling oil pipe.

DETAILED DESCRIPTION

The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

In this embodiment, referring to Fig. 1 to Fig. 6, a four-blade Roots vacuum pump is specifically implemented, comprising a pump body 1 and a pump cover 2. An accommodating chamber 3 is provided inside the pump body 1. Two horizontal rotating shafts 4 are connected to the accommodating chamber 3. A rotor 5 is coaxially connected to the rotating shaft 4. Four raised impeller parts 6 are arranged around the outer surface of the rotor 5. A concave arc part 7 is arranged between the two impeller parts 6. The arc part 7 is used to cooperate with the impeller part 6. A first oil seal 8 and a second oil seal 9 are coaxially connected to the rotating shaft 4. The first oil seal 8 and the second oil seal 9 are respectively arranged at both ends of the rotor 5 and are in contact with the end surface of the rotor 5. Abutment, the surfaces where the first oil seal 8 and the second oil seal 9 contact the end faces of the rotor 5 are provided with a sealing cavity 10, the rotor 5 is coaxially installed in the middle of the rotating shaft 4, the rotating shaft 4 is provided with a sealing protrusion 11 which is closely fitted with the sealing cavity 10, the two ends of the rotating shaft 4 are connected to the inner wall of the accommodating cavity 3 through a rotating member, the inner wall of the accommodating cavity 3 is provided with a mounting groove 12 for fitting the rotating member, the rotating member is composed of two rolling bearings 15, the two rolling bearings 15 are coaxially connected to the rotating shaft 4, and the two ends of the rotating shaft 4 are connected with two rolling bearings 15, so that the rotating shaft 4 can be driven to drive the rotor 5 to rotate.

One end of the rotating shaft 4 extends to the outside of the pump body 1 through the mounting notch 12. When the two rotors 5 rotate and match, the impeller part 6 rotates along the inner wall of the accommodating chamber 3 under the drive of the rotating shaft 4, and the impeller part 6 and the arc-shaped part 7 rotate and contact to match. The side of the pump body 1 is provided with a mounting hole 13 for matching the rotating shaft 4, and the mounting hole 13 is connected with the mounting notch 12, and the inner wall of the mounting hole 13 is provided with a positioning pin groove 14, and the positioning pin groove 14 can enhance the stability of the connection with the rotating shaft 4.

The pump body 1 is symmetrically provided with an inlet end 16 and an outlet end 17 on the left and right sides. The adjacent ends of the inlet end 16 and the outlet end 17 are connected to the accommodating chamber 3 in the pump body 1. The two rotors 5 rotate with each other. The gap between the rotors 5 and between the accommodating chamber 3 of the pump body 1 and the rotors 5 is only 5 to 10 threads. The rotating shaft 4 drives the rotor 5 at a very high speed, so the rotor 5 forms an air intake chamber and an air exhaust chamber, which are quickly separated, so that the volume of the air intake chamber gradually increases, the pressure decreases to form a vacuum, and the volume of the air exhaust chamber gradually decreases, the pressure increases to discharge the gas.

The bottom of the pump body 1 is provided with a mounting bracket 18, and two mounting brackets 18 are provided and symmetrically arranged. The upper surface of the mounting bracket 18 is provided with a fixing hole for installation. The two mounting brackets 18 are in a bilaterally symmetrical "L" shape, which is convenient for supporting and connecting. The pump cover 2 is installed on the side of the pump body 1 close to the mounting hole 13, and the pump cover 2 is connected to the pump body 1 by bolts. The side of the pump cover 2 is connected to a cooling oil pipe 19. The side where the pump cover 2 is connected to the pump body forms an inner cavity. The end of the cooling oil pipe 19 is connected to the inner cavity of the pump cover 2, so as to facilitate cooling and heat dissipation of the rotating shaft 4.

In this embodiment, by opening one side of the pump body 1, the rotor 5 is coaxially mounted on the rotating shaft 4, and the first oil seal 8 and the second oil seal 9 are respectively connected on both sides, so that the rotor 5 is embedded and installed with the sealing protrusion 11 on the rotating shaft 4 through the sealing cavity 10, and abuts against the end surface of the rotor 5, thereby completing the sealing installation of the rotor 5, which can effectively block the gas leakage in the pump cavity and improve the shaft sealing performance of the rotor 5 and the rotating shaft 4. The rolling bearing 15 is installed on the rotating shaft 4 and is embedded with the installation notch 12 in the accommodating cavity 3, so that the rotating shaft 4 can drive the rotor 5 to rotate The action makes the rotating shaft 4 drive the rotor 5 more stably during operation, which is beneficial to prolonging the service life of the vacuum pump. One end of the rotating shaft 4 extends to the mounting hole 13 through the mounting slot 12 and is connected to the external connecting piece, so as to drive the rotor 5 to rotate by driving the rotating shaft 4. As the rotor 5 rotates, the volume of the suction chamber in the accommodating chamber 3 is gradually increased to form a vacuum state, so that the gas can be sucked into the pump body 1 from the inlet end 16. At the same time, the gas in the exhaust chamber is compressed and discharged from the outlet end 17 to form a negative pressure vacuum, completing the process of suction-compression-exhaust.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims (7)

1. A four-leaf Roots vacuum pump, comprising a pump body and a pump cover, a housing chamber is provided inside the pump body, two horizontal rotating shafts are connected in the housing chamber, a rotor is coaxially connected to the rotating shaft, and the characteristic is that four raised impeller parts are arranged around the outer surface of the rotor, a concave arc part is arranged between the two impeller parts, the arc part is used to match the impeller part, a first oil seal and a second oil seal are coaxially connected to the rotating shaft, the first oil seal and the second oil seal are respectively arranged at two ends of the rotor and abut against the end face of the rotor, a sealing chamber is provided on the surfaces of the first oil seal and the second oil seal that contact the end face of the rotor, the rotor is coaxially installed in the middle part of the rotating shaft, a sealing protrusion that is closely fitted with the sealing chamber is provided on the rotating shaft, two ends of the rotating shaft are connected to the inner wall of the housing chamber through a rotating member, the inner wall of the housing chamber is provided with a mounting notch for fitting and mounting the rotating member, and one end of the rotating shaft extends to the outside of the pump body through the mounting notch. 2. The four-blade Roots vacuum pump according to claim 1 is characterized in that when the two rotors rotate in coordination, the impeller portion rotates along the inner wall of the accommodating chamber under the drive of the rotating shaft, and the impeller portion and the arc portion rotate in contact and mate. 3. The four-leaf Roots vacuum pump according to claim 1 is characterized in that: a mounting hole for matching the rotating shaft is provided on the side of the pump body, and the mounting hole is connected with the mounting notch, and a positioning pin groove is provided on the inner wall of the mounting hole. 4. The four-leaf Roots vacuum pump according to any one of claims 1 to 3, characterized in that the rotating member is composed of two rolling bearings, and the two rolling bearings are coaxially connected to the rotating shaft. 5. The four-leaf Roots vacuum pump according to any one of claims 1 to 3, characterized in that an inlet end and an outlet end are symmetrically arranged on the left and right sides of the pump body, and the adjacent ends of the inlet end and the outlet end are both connected to the accommodating cavity in the pump body. 6. The four-leaf Roots vacuum pump according to any one of claims 1 to 3, characterized in that a mounting bracket is provided at the bottom of the pump body, two mounting brackets are provided and are symmetrically arranged, and a fixing hole for installation is provided on the upper surface of the mounting bracket. 7. The four-leaf Roots vacuum pump according to any one of claims 1 to 3, characterized in that the pump cover is installed on a side of the pump body close to the mounting hole, and the pump cover is connected to the pump body by bolts, and a cooling oil pipe is connected to the side of the pump cover.