阅读说明：本技术 一种罗茨鼓风机转子端面环形密封结构 (Roots blower rotor end face annular sealing structure ) 是由 孙帅辉 武鹏波 郭鹏程 郑小波 于 2019-11-19 设计创作，主要内容包括：本发明公开的一种罗茨鼓风机转子端面环形密封结构,包括分别开设在罗茨鼓风机转子两个端面上的密封槽,密封槽内配合有向外滑出并抵至罗茨鼓风机壳体内壁的密封条。本发明一种罗茨鼓风机转子端面环形密封结构,罗茨鼓风机转子高速转动时,通过向外滑出的密封条,使得罗茨鼓风机的端面间隙自动达到最小值,能够将转子高速旋转产生的离心力和热膨胀综合应用,有效减少转子端面与壳体端面之间的气体泄漏；同时具备易加工和更换的特点,提高罗茨鼓风机的可靠性和风机效率。(The invention discloses an annular sealing structure of a rotor end face of a Roots blower, which comprises sealing grooves respectively arranged on two end faces of the Roots blower rotor, wherein sealing strips which outwards slide out and are propped against the inner wall of a shell of the Roots blower are matched in the sealing grooves.)

The annular sealing structure for the rotor end faces of the Roots blower is characterized by comprising sealing grooves (2) which are respectively arranged on two end faces of a Roots blower rotor (1), wherein sealing strips (3) which slide outwards and abut against the inner wall of a shell (6) of the Roots blower are matched in the sealing grooves (2).

2. The Roots blower rotor face ring seal arrangement as set forth in claim 1, wherein the seal groove (2) is ring-shaped and is located adjacent to the rim of the Roots blower rotor (1) face.

3. The Roots blower rotor end face annular seal structure as set forth in claim 2, wherein the outer vertical face of the seal groove (2) is an inclined face inclined to the outside.

4. The Roots blower rotor end face annular sealing structure as set forth in claim 3, wherein the sealing strip (3) is located in the sealing groove (2) and has a portion corresponding to the sealing groove, and the portion of the sealing strip (3) extending out of the sealing groove (2) is inclined inward to form an acute angle with the inner wall of the Roots blower casing (6) close to the outer side.

5. The Roots blower rotor end face annular sealing structure as set forth in claim 3, wherein the angle of inclination of the outer vertical face of the sealing groove (2) with respect to the inner vertical face is 2-35 °.

6. The Roots blower rotor end face annular sealing structure as set forth in claim 3, wherein the section of the sealing groove (2) perpendicular to the end face of the Roots blower rotor (1) is in the shape of a right trapezoid with an open lower bottom.

7. The Roots blower rotor end face annular sealing structure as set forth in claim 2, wherein the sealing groove (2) is provided with slot holes (4) along the outer sides of the major and minor diameters of the Roots blower rotor (1) end face.

8. The Roots blower rotor end face annular sealing structure as set forth in claim 7, wherein the sealing strips (3) are connected with the lugs (5) which are matched with the sealing strips at the positions close to the slotted holes (4).

9. The Roots blower rotor end face annular seal structure as set forth in claim 1, wherein the seal strip (3) is of self-lubricating material.

Technical Field

The invention belongs to the technical field of blower sealing devices, and particularly relates to an annular sealing structure for the end face of Roots blower rotors.

Background

The Roots blower is a volumetric rotary blower, is a typical gas pressurization and delivery machine of , and has the greatest characteristic that the air discharge amount is almost unchanged within the range of the use pressure, and has the characteristics of simple structure, convenient maintenance, long service life, flexible and variable installation mode, high volumetric efficiency, and no oil and oil contained in the delivery medium, so is widely applied to various industries of economic construction, because of the relative movement between the Roots blower rotor and the housing end surface, a gap, called axial gap, exists between the end surface of the rotor and the housing end surface in order to avoid interference or friction, if the axial gap is too small, the housing end surface and the Roots end surface are abraded, and simultaneously friction generates heat, the temperature of the bearing is increased through heat conduction, so that the bearing is damaged, the normal operation of the blower is influenced, if the axial gap is too large, the phenomenon that compressed gas returns through the gap portion occurs, so that the blower efficiency is reduced and the output is insufficient, in the prior art, the gap between the rotor end surface and the housing end surface is designed to be large, the inner leakage is large, the fan efficiency is low, the rotor end surface sealing structure is developed around , such as a sealing structure for realizing the high-pressure sealing structure, and a sealing structure for realizing the sealing structure for a high-pressure-sealing structure for a high-pressure rotary-sealing rotor-sealing structure () is used for a high-sealing structure for a high-pressure rotary-type rotary blower-type rotary-.

Disclosure of Invention

The invention aims to provide annular sealing structures on the end faces of rotors of a Roots blower, which can effectively reduce the leakage amount of end face gaps and improve the efficiency of the Roots blower.

The technical scheme includes that the Roots blower rotor end face annular sealing structures comprise sealing grooves which are respectively formed in two end faces of a Roots blower rotor, and sealing strips which slide outwards and are abutted to the inner wall of a Roots blower shell are matched in the sealing grooves.

The present invention is also characterized in that,

the sealing groove is annular and is close to the edge of the rotor end surface of the Roots blower.

The outer vertical surface of the seal groove is an inclined surface inclined to the outside.

The part of the sealing strip in the sealing groove is matched with the sealing strip in size, and the part of the sealing strip extending out of the sealing groove is inwards inclined to form an acute angle with the inner wall of the Roots blower shell close to the outer side.

The inclination angle of the outer vertical surface of the sealing groove relative to the inner vertical surface is 2-35 degrees.

The section of the sealing groove, which is vertical to the rotor end face of the Roots blower, is in a right trapezoid shape, and the lower bottom of the sealing groove is provided with an opening.

Slotted holes are formed in the sealing groove along the outer sides of the long diameter and the short diameter of the rotor end face of the Roots blower.

The positions of the sealing strips close to the slotted holes are connected with lugs matched with the slotted holes.

The sealing strip is made of self-lubricating materials.

The Roots blower rotor end face annular sealing structure has the advantages that when the Roots blower rotor rotates at a high speed, the end face clearance of the Roots blower automatically reaches the minimum value through the sealing strips sliding outwards, the centrifugal force and the thermal expansion generated by the high-speed rotation of the rotor can be comprehensively applied, the gas leakage between the end face of the rotor and the end face of the shell is effectively reduced, the characteristics of easiness in processing and replacement are realized, and the reliability of the Roots blower and the fan efficiency are improved.

Drawings

FIG. 1 is a schematic structural diagram of an annular sealing structure of an end face of a rotor of Roots blower;

FIG. 2 is a schematic structural diagram of a sealing strip in an annular sealing structure of the end face of the rotor of the Roots blower;

FIG. 3 is a cross-sectional view of the Roots blower rotor face annular seal arrangement of the present invention taken perpendicular to the Roots blower rotor face;

FIG. 4 is a force pattern of the sealing strips in the annular sealing structure of the end face of the rotor of the Roots blower of types according to the invention when the rotor of the Roots blower rotates;

FIG. 5 is a state view of the Roots blower rotor at 0;

fig. 6 is a state diagram of the roots blower at 30 ° of rotor.

In the figure, 1, Roots blower rotor, 2, sealing groove, 3, sealing strip, 4, slotted hole, 5, lug and 6, Roots blower shell.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The invention provides an annular sealing structure of rotor end faces of a Roots blower, as shown in figures 1 and 2, the annular sealing structure comprises sealing grooves 2 which are respectively arranged on two end faces of a Roots blower rotor 1, each sealing groove 2 is annular and is close to the edge of the end face of the Roots blower rotor 1, the outer vertical face of each sealing groove 2 is an inclined face which is inclined outwards, the inclined angle of each inclined face relative to the inner vertical face is 2-35 degrees, different angles are selected according to different rotor rotating speeds, the inclined angle of a high-rotating-speed rotor is correspondingly reduced, a self-lubricating material sealing strip 3 which slides outwards and is propped against the inner wall of a Roots blower shell 6 is matched in each sealing groove 2, the part of each sealing strip 3, which is positioned in each sealing groove 2, is matched with the size of the sealing strip 3, the part.

The slot holes 4 are formed in the sealing groove 2 along the outer sides of the long diameter and the short diameter of the end face of the Roots blower rotor 1, the positions, close to the slot holes 4, of the sealing strips 3 are connected with the lugs 5 matched with the sealing strips for fixing the relative positions of the sealing strips 3, deformation of the sealing strips 3 caused by centrifugal force and thermal expansion is uniformly distributed around the end face of the Roots blower rotor 1, local abrasion is weakened, and the leakage degree of the local abrasion is reduced.

As shown in fig. 3, the seal groove 2 has a right-angled trapezoidal cross section perpendicular to the end face of the roots blower rotor 1 and has an open lower bottom.

When the Roots blower rotor 1 works, when the Roots blower rotor 1 rotates at a high speed, as shown in figure 4, the annular sealing strip 3 is acted by a centrifugal force F, a component F1 of the F is perpendicular to the inclined surface of the sealing groove 2, a component F2 of the F is outwards thrown along the inclined surface of the sealing groove 2 to press the sealing strip 3 to the inner side of the Roots blower, the sealing effect is further enhanced by , when the sealing strip 3 is partially worn, the gas leakage amount is increased, the gas leakage amount is reduced due to the component F2 of the sealing strip 3, when the high-speed rotor operates for a long time, the sealing strip 3 expands outwards to improve the sealing effect, as shown in figure 3, the included angle between the side, which extends out of the sealing strip 3 of the sealing groove 2, of the Roots blower rotor 1 and the inner wall of the Roots blower housing 6 is an acute angle, namely, the included angle part of the sealing strip 3 is an obtuse angle, so that the sealing strip 3 is contacted with the inner surface of the Roots blower housing 6 when the Roots blower rotor 1 rotates (for example, the Roots blower housing 6 rotates from 0 degree to 30 degree.

According to the type Roots blower rotor end face annular sealing structure, when the Roots blower rotor 1 rotates at a high speed, the end face clearance of the Roots blower is automatically minimized through the sealing strips 3 sliding outwards, the end face leakage of the Roots blower rotor 1 is reduced to the greatest extent, the clearance volume is reduced by steps, the outer vertical faces of the sealing grooves 2 are inclined faces inclined outwards, component force of centrifugal force generated by rotation of the high-speed rotor is outwards along the inclined faces, the sealing strips 3 are outwards thrown, and therefore the sealing effect is enhanced.