CN108757440B

CN108757440B - Fixed bearing assembly for gear pump

Info

Publication number: CN108757440B
Application number: CN201810516855.8A
Authority: CN
Inventors: 何渊博; 何国强; 秦飞; 魏祥庚; 刘洋; 陈剑
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2018-05-25
Filing date: 2018-05-25
Publication date: 2020-06-30
Anticipated expiration: 2038-05-25
Also published as: CN108757440A

Abstract

The invention discloses a fixed bearing assembly for a gear pump, which comprises a body, wherein the body comprises two bearing rings, the side walls of the two bearing rings are jointed and assembled together, and the jointed side surfaces of the two bearing rings are planar; on the upper surface of the body, a groove is formed around the edge of the bearing ring, a sealing ring is placed in the groove, and the shape and the size of the sealing ring are consistent with those of the groove. The fixed bearing assembly for the gear pump has good sealing performance and is not easy to leak.

Description

Fixed bearing assembly for gear pump

Technical Field

The invention belongs to the technical field of fluid machinery manufacturing, and particularly relates to a fixed bearing assembly for a gear pump.

Background

The gear shaft is assembled in an inner hole of the fixed bearing, a small gap exists between the fixed bearing and the outer circle of the fixed bearing, the outer circle of the fixed bearing is arranged in the shell, and a small gap exists between the outer circle of the fixed bearing and the shell, the gap is communicated with a high-pressure cavity in the pump, meanwhile, for convenience of processing, the fixed bearing assembly is usually formed by combining two bearings which are not in a full circle shape, the structure causes that the sealing design is difficult to be carried out between a high-pressure area outside the fixed bearing and a low-pressure area inside the fixed bearing, internal leakage is easy to cause, and the efficiency of the gear pump under high pressure is influenced.

Disclosure of Invention

The present invention is directed to a fixed bearing assembly for a gear pump, which has a good sealing performance and is not easy to leak.

In order to solve the technical problem, the invention adopts the technical scheme that the fixed bearing assembly for the gear pump comprises a body, wherein the body comprises two bearing rings, the side walls of the two bearing rings are jointed and assembled together, and the jointed side surfaces of the two bearing rings are planar; on the upper surface of the body, a groove is formed around the edge of the bearing ring, a sealing ring is placed in the groove, and the shape and the size of the sealing ring are consistent with those of the groove.

Further, the shape of the longitudinal section of the sealing ring is as follows: the bottom is rectangular and a semicircular bulge is positioned above the rectangle.

Further, the protrusion is located at a middle position above the rectangle.

Furthermore, in the groove, a semicircular hole is formed at the joint of the two bearing rings, and when the two bearing rings are attached together, the corresponding semicircular hole forms a circular fixing hole; and the positions of the sealing rings corresponding to the fixing holes are provided with cylindrical lugs used for being clamped in the fixing holes.

Further, the two bearing rings are detachably connected through a connecting device and can move relatively in the axial direction; the connecting device comprises an annular connecting hole formed in the plane of each bearing ring and a positioning pin, and the two ends of the positioning pin are clamped in the corresponding connecting holes; the positioning pin is fixed in the radial direction and can move in the axial direction in a displacement mode so as to drive the corresponding bearing rings to move relatively in the axial direction and adjust that two surfaces of the two bearing rings on the same side are completely located on the same plane.

Furthermore, the upper end and the lower end of the ring shape of the connecting hole are semicircles with the same diameter.

Further, the positioning pin is cylindrical, and the diameter of the cylinder is consistent with the width of the rectangular part of the connecting hole. So that it is fixed in the radial direction.

The invention also discloses the sealing ring, which is formed by two large semicircles with the end parts correspondingly connected, wherein the joint of the two large semicircles is provided with a cylindrical lug which is used for being clamped in the fixing hole; the longitudinal section of the utility model is rectangular at the bottom and semicircular at the top.

The fixed bearing assembly for the gear pump has the following advantages that: 1. the lug is inserted into the fixing hole, so that the cover plate can not extrude and displace the sealing ring when the gear pump is installed, and the sealing ring can be prevented from being damaged by the extrusion of the fixed bearing and the edge of the cover plate. 2, the installation position of the sealing ring is kept, and the displacement of the sealing ring caused by the vibration of the bearing ring during working under the non-uniform stress state is prevented. 3. The rectangular structure at the bottom of the sealing ring is beneficial to installation and positioning of the sealing ring in an irregular shape, and the semicircular structure at the upper part is used for preventing the resilience force generated by deformation of the sealing ring from being too large under the condition of realizing sealing, so that the fitting of the fixed bearing assembly and the cover plate is influenced. 4. After the assembly, the influence of position error in the process of processing two connecting holes is eliminated. 5. During the assembly, the position of the bearing ring can be axially adjusted, so that two surfaces of the same end of the two bearing rings are completely positioned on the same plane.

Drawings

FIG. 1 is a schematic structural view of a fixed bearing assembly for a gear pump in accordance with the present invention;

FIG. 2 is a schematic view of the structure of the two bearing rings of the present invention;

FIG. 3 is a longitudinal sectional view of the seal ring of the present invention;

figure 4 is a schematic view of a planar portion of a bearing ring according to the present invention.

Wherein: 1. a bearing ring; 2. a groove; 3. a semicircular hole; 4. a fixing hole; 5. a seal ring; 5-1, rectangle; 5-2, semicircular bulges; 6. a lug; 7. connecting holes; 8. and a positioning pin.

Detailed Description

The invention relates to a fixed bearing assembly for a gear pump, which comprises a body, a bearing ring and a bearing ring, wherein the body comprises two bearing rings 1, the side walls of the two bearing rings 1 are jointed and assembled together, and the jointed side surfaces of the two bearing rings 1 are planar; on the upper surface of body, open flutedly 2 around the border of bearing circle 1, place sealing washer 5 in the recess 2, the shape and the size of sealing washer 5 are unanimous with flutedly 2. The shape is as follows: is formed by a large semicircle with two ends correspondingly connected. The material can be selected from various materials such as fluororubber, fluorosilicone rubber, nitrile rubber and the like according to the medium characteristics and the temperature characteristics.

As shown in fig. 2, 3 and 4, the seal ring 5 has a longitudinal section in the shape of: the bottom is a rectangle 5-1 and a semicircular bulge 5-2 positioned above the rectangle 5-1. The projection 5-2 is located at a middle position above the rectangle 5-1.

In order to realize the assembly of the bearing rings 1 and the groove 2, in the groove 2, a semicircular hole 3 is respectively formed at the joint of the two bearing rings 1, and when the two bearing rings 1 are attached together, the corresponding semicircular hole 3 forms a circular fixing hole 4; the sealing ring 5 is provided with a cylindrical lug 6 which is used for being clamped in the fixing hole 4 at a position corresponding to the fixing hole 4. When the product is assembled, the sealing ring 5 is placed in the groove 2, and the two lugs 6 are inserted into the corresponding fixing holes 4. It is also necessary to use a cover plate to press from above, compressing the entire gasket 5.

The two bearing rings 1 are detachably connected through a connecting device and can move relatively in the axial direction; the connecting device comprises an annular connecting hole 7 formed in the plane of each bearing ring 1 and a positioning pin 8, and two ends of the positioning pin 8 are clamped in the corresponding connecting holes 7; the positioning pin 8 is fixed in the radial direction and can move in the axial direction in a displacement manner so as to drive the corresponding bearing rings 1 to move relatively in the axial direction, so that two surfaces of the two bearing rings 1 on the same side are adjusted to be completely located on the same plane. The positioning pin 8 is cylindrical, and the diameter of the cylinder is consistent with the width of the rectangular part of the connecting hole 7. So that it is fixed in the radial direction. The upper end and the lower end of the connecting hole 7 are semicircles with the same diameter. According to the gear pump working principle, two symmetrical fixed bearings constituting a fixed bearing assembly are required to be completely symmetrical in the radial direction, but have an up-and-down adjustable function in the axial direction. Two bearing rings 1 are detachably connected through a connecting device and can move relatively in the axial direction; the inner wall of the cover plate is attached to the surface of the body, the inner wall surface has high precision requirement, and the flatness error is not more than five thousandths. During installation, the two bearing rings 1 can move in the axial direction through the positioning pin 8, so that two surfaces at the same end of the two bearing rings 1 are tightly attached to the inner wall surface of the cover plate. The lug 6 is inserted into the fixing hole 4, so that the cover plate can not extrude and displace the sealing ring 5 when the gear pump is installed, and the fixed bearing and the edge of the cover plate are prevented from extruding to damage the rubber ring. And the installation position of the sealing ring 5 is also kept, so that the displacement of the fixed bearing caused by vibration during working under the non-uniform stress state is prevented.

For example, the diameter of the connecting hole 7 is 2mm, the center distance is 0.5mm, and when the device is installed, the connecting hole 7 is connected and attached by a cylindrical positioning pin 8 with the diameter of 2 mm. Because the structure of the connecting hole 7 is the same as the diameter of the positioning pin 8 in the width direction and is 2mm, the assembled fixed bearing assembly is fixed by the positioning pin 8 in the radial direction, and the width of the connecting hole 7 of the fixed bearing in the axial direction is larger than the diameter of the positioning pin 8, so that the two fixed bearing rings 1 can be displaced relatively and have an axial adjusting function. In order to realize accurate assembly, the center distance of the two semicircles is larger than the processing error of the positions of the two connecting holes 7.

The invention also discloses the sealing ring, which is formed by two large semicircles with the end parts correspondingly connected, wherein the joint of the two large semicircles is provided with a cylindrical lug 6 which is used for being clamped in the fixed hole 4; the longitudinal section of the utility model is in the shape of a rectangle 5-1 at the bottom, and a semicircular bulge 5-2 at the upper part of the rectangle 5-1. The bottom is rectangular 5-1 to facilitate the installation and positioning of the seal ring 5 in irregular shapes. The semicircular bulge 5-2 is arranged above the sealing ring, so that the resilience force of the deformation of the sealing ring 5 is not too large under the condition of realizing sealing, and the joint of the fixed bearing assembly and the cover plate is not influenced.

Claims

1. A fixed bearing assembly for a gear pump is characterized by comprising a body, wherein the body comprises two bearing rings (1) with side walls fitted together, and the fitted side surfaces of the two bearing rings (1) are planar; a groove (2) is formed in the upper surface of the body and surrounds the edge of the bearing ring (1), a sealing ring (5) is placed in the groove (2), and the shape and size of the sealing ring (5) are consistent with those of the groove (2);

the shape of the longitudinal section of the sealing ring (5) is as follows: the bottom is a rectangle (5-1) and a semicircular bulge (5-2) positioned above the rectangle (5-1);

the bulge (5-2) is positioned in the middle position above the rectangle (5-1);

in the groove (2), a semicircular hole (3) is formed in the joint of the two bearing rings (1), and when the two bearing rings (1) are attached together, a circular fixing hole (4) is formed in the corresponding semicircular hole (3); and the positions, corresponding to the fixing holes (4), on the sealing rings (5) are provided with cylindrical lugs (6) which are used for being clamped in the fixing holes (4).

2. A stationary bearing assembly for a gear pump according to claim 1, characterized in that the two bearing rings (1) are detachably connected by connecting means and are relatively movable in axial direction; the connecting device comprises an annular connecting hole (7) formed in the plane of each bearing ring (1) and a positioning pin (8), and the two ends of the positioning pin (8) are clamped in the corresponding connecting holes (7); the positioning pin (8) is fixed in the radial direction and can move in the axial direction in a displacement mode so as to drive the corresponding bearing rings (1) to move relatively in the axial direction and adjust that two surfaces of the two bearing rings (1) on the same side are completely located on the same plane.

3. A stationary bearing assembly for a gear pump according to claim 1, characterized in that the upper and lower ends of the connection hole (7) are semi-circles of the same diameter.

4. A stationary bearing assembly for a gear pump according to claim 2, characterized in that the positioning pin (8) is cylindrical with a diameter corresponding to the width of the rectangular portion of the coupling hole (7) so that it is fixed in the radial direction.

5. A sealing ring is characterized by being formed by two large semicircles with the end parts correspondingly connected, and a cylindrical lug (6) used for being clamped in a fixing hole (4) is arranged at the joint of the two large semicircles; the longitudinal section of the utility model is in the shape of a rectangle (5-1) at the bottom, and a semicircular bulge (5-2) is arranged above the rectangle (5-1).