A high-pressure oil-top structure for preventing backflow of sliding bearings for large motors

Abstract

The utility model discloses a high-pressure oil-top structure for preventing backflow of sliding bearings for large motors, comprising a bearing seat and a bearing shell installed in the bearing seat, an oil inlet connector is fixed on the side plate of the bearing seat, the inner end of the oil inlet connector extends into the bearing seat, one end of an insulating hose is fixed to the inner end of the oil inlet connector through a first hollow bolt, the other end of the insulating hose is fixed to the bearing shell through a second hollow bolt, one end of the insulating hose is communicated with the oil inlet connector, and the other end is communicated with an upwardly extending vertical oil inlet hole formed at the bottom end of the bearing shell, the inner end of the vertical oil inlet hole extends out of the inner side wall of the bearing shell; a check valve is installed at the inner end of the vertical oil inlet hole, and the oil inlet of the check valve is communicated with the vertical oil inlet hole. It is easy to install, the added check valve can prevent oil from flowing back, and the internal structure of the check valve is simple and firm, and it is easy to manufacture.

Description

Technical field:

[0001] The utility model relates to the technical field of bearing bush equipment, and more specifically to a high-pressure oil-top structure for preventing backflow of sliding bearings used in large motors. Background technology:

[0002] Sliding bearings for large synchronous motors are mainly used in conditions of frequent forward and reverse rotation or high load. At present, high-pressure oil lifting devices are generally used. The use of high-pressure oil lifting devices effectively alleviates the problem of excessive friction coefficient when the oil film is not formed at the start of the motor, and also provides a guarantee for sufficient lubricating oil when the motor fails and stops, ensuring the safety of bearings and motors.

[0003] However, the conventional high-pressure oil jacking device also has some problems, for example, a general high-pressure jacking device is not equipped with a one-way valve structure, which is prone to backflow problems. Utility model content:

[0004] The utility model aims to overcome the deficiencies of the prior art and to provide a high-pressure oil-top structure for preventing backflow of sliding bearings for large motors. The utility model is simple to install, and the added one-way valve can prevent oil backflow. The internal structure of the one-way valve is simple and firm, and the manufacturing is convenient.

[0005] The solution of the utility model to solve the technical problem is:

[0006] A high-pressure oil-top structure for sliding bearings for large motors to prevent backflow, comprising a bearing seat and a bearing bushing installed in the bearing seat, an oil inlet connector fixed to a side plate of the bearing seat, the inner end of the oil inlet connector extending into the bearing seat, one end of an insulating hose fixed to the inner end of the oil inlet connector via a first hollow bolt, the other end of the insulating hose fixed to the bearing bushing via a second hollow bolt, one end of the insulating hose communicating with the oil inlet connector, the other end communicating with an upwardly extending vertical oil inlet hole formed at the bottom end of the bearing bushing, the inner end of the vertical oil inlet hole extending out of the inner side wall of the bearing bushing;

[0007] A one-way valve is installed at the inner end of the vertical oil inlet hole, and the oil inlet of the one-way valve is communicated with the vertical oil inlet hole. The one-way valve can realize oil reflux and has good use effect.

[0008] A fixing plate is fixedly connected to the outer wall of the side plate of the bearing seat by bolts, and a through hole is formed in the middle of the fixing plate, which is communicated with and corresponds to the first screw-connected through hole on the side plate of the bearing seat, and an oil inlet connector is inserted into the corresponding through hole and screwed in the first screw-connected through hole, and the inner end face of the rotating part of the outer end of the oil inlet connector is pressed against the outer wall surface of the fixing plate, and the inner end face of the fixing plate is pressed against the outer wall of the side plate of the bearing seat, and the inner end of the oil inlet connector extends out of the inner side wall of the side plate of the bearing seat, and an axially extending oil inlet through hole is formed in the middle of the oil inlet connector, and internal threads are formed at both ends of the oil inlet through hole.

[0009] Both ends of the insulating hose are formed with an annular portion, an annular groove is formed on the inner side of the annular portion, the annular groove is communicated with the annular cavity inside the annular portion, the two annular cavities are communicated with the middle through hole of the insulating hose, the screw portion of the first hollow bolt is screwed on the internal thread of the inner end of the oil inlet connector, the central through hole of the screw portion of the first hollow bolt is communicated with the oil inlet through hole of the oil inlet connector, the outer side wall of one end of the screw portion of the first hollow bolt close to the rotating portion is a cylindrical wall surface, which is a cylindrical portion, and a radial through hole is formed on it, and the radial through hole is communicated with the central through hole of the screw portion of the first hollow bolt;

[0010] A mounting groove is formed on one side of the bottom end of the bearing shell, and the top surface of the mounting groove is a horizontal surface. A vertical oil inlet hole extending inward and protruding out of the inner wall of the bearing shell is formed on the top surface of the mounting groove. The vertical oil inlet hole is a stepped through hole, which includes a large-diameter threaded hole section at the outer end, a transition hole section in the middle, and a small-diameter hole section at the inner end. One end of the transition hole section is connected with the large-diameter threaded hole section, and the other end is connected with the small-diameter hole section. The inner end of the small-diameter hole section protrudes out of the inner wall of the bearing shell, and the outer end of the large-diameter threaded hole section protrudes out of the top surface of the mounting groove. The screw portion of the second hollow bolt is screwed in the large-diameter threaded hole section. The outer side wall of one end of the screw portion of the second hollow bolt close to the rotating portion is a cylindrical wall surface, which is a cylindrical portion, and a radial through hole is formed on it, and the radial through hole is connected with the central through hole of the screw portion of the second hollow bolt.

[0011] The cylindrical part of the first hollow bolt and the cylindrical part of the second hollow bolt are clamped on the inner side wall of the corresponding annular part, and the radial through hole is connected to the annular groove of the annular part. The first hollow bolt and the second hollow bolt are both conventional structures.

[0012] Two washers are inserted on the cylindrical parts of the first hollow bolt and the second hollow bolt, and the annular part is clamped between the corresponding two washers. The outer end face of one washer presses against the end face of the rotating part of the first hollow bolt or the second hollow bolt, one end face of the other washer at the first hollow bolt presses against the inner end face of the oil inlet connector, and one end face of the other washer at the second hollow bolt presses against the top face of the mounting groove.

[0013] The one-way valve is a threaded one-way valve.

[0014] The outstanding effects of the utility model are:

[0015] Compared with the prior art, the invention is easy to install, the added one-way valve can prevent oil from flowing back, and the internal structure of the one-way valve is simple and firm, and the manufacturing is convenient. Description of the drawings:

[0016] Figure 1 It is a partial structural schematic diagram of the utility model;

[0017] Figure 2 yes Figure 1 A partial enlarged view of . Specific implementation method:

[0018] For example, see Figure 1 to Figure 2 As shown, a backflow prevention and high-pressure oil-top structure for sliding bearings for large motors comprises a bearing seat 10 and a bearing shell 20 installed in the bearing seat 10, wherein a fixing plate 11 is fixedly connected to the outer wall of the side plate of the bearing seat 10 by bolts, and a through hole is formed in the middle of the fixing plate 11, which is communicated with and corresponds to the first screw-connected through hole 13 on the side plate of the bearing seat 10, and an oil inlet connector 30 is inserted into the corresponding through hole and screwed in the first screw-connected through hole 13, and the inner end face of the rotating part of the outer end of the oil inlet connector 30 is pressed against the outer wall face of the fixing plate 11, and the inner end face of the fixing plate 11 is pressed against the outer wall of the side plate of the bearing seat 10, and the inner end of the oil inlet connector 30 extends out of the inner wall of the side plate of the bearing seat 10, and an axially extending oil inlet through hole is formed in the middle of the oil inlet connector 30, and both ends of the oil inlet through hole are formed with internal threads.

[0019] Furthermore, one end of the insulating hose 50 is fixed to the inner end of the oil inlet connector 30 through the first hollow bolt 40, and the other end of the insulating hose 50 is fixed to the bearing bush 20 through the second hollow bolt 60. One end of the insulating hose 50 is communicated with the oil inlet connector 30, and the other end is communicated with the upwardly extending vertical oil inlet hole 21 formed at the bottom end of the bearing bush 20, and the inner end of the vertical oil inlet hole 21 extends out of the inner side wall of the bearing bush 20.

[0020] A one-way valve 70 is installed at the inner end of the vertical oil inlet hole 21 , and an oil inlet of the one-way valve 70 is communicated with the vertical oil inlet hole 21 .

[0021] Furthermore, an annular portion 51 is formed at both ends of the insulating hose 50, an annular groove is formed on the inner side of the annular portion 51, the annular groove is communicated with the annular cavity inside the annular portion 51, the two annular cavities are communicated with the through hole in the middle of the insulating hose 50, the screw portion of the first hollow bolt 40 is screwed on the internal thread of the inner end of the oil inlet connector 30, the central through hole of the screw portion of the first hollow bolt 40 is communicated with the oil inlet through hole of the oil inlet connector 30, the outer side wall of one end of the screw portion of the first hollow bolt 40 close to the rotating portion is a cylindrical wall surface, which is a cylindrical portion, and a radial through hole is formed on it, and the radial through hole is communicated with the central through hole of the screw portion of the first hollow bolt 40;

[0022] A mounting groove is formed on one side of the bottom end of the bearing shell 20, and the top surface of the mounting groove is a horizontal surface. A vertical oil inlet hole 21 extending inward and protruding out of the inner wall of the bearing shell 20 is formed on the top surface of the mounting groove. The vertical oil inlet hole 21 is a stepped through hole, which includes a large-diameter threaded hole section at the outer end, a transition hole section in the middle, and a small-diameter hole section at the inner end. One end of the transition hole section is connected to the large-diameter threaded hole section, and the other end is connected to the small-diameter hole section. The inner end of the small-diameter hole section protrudes out of the inner wall of the bearing shell 20, and the outer end of the large-diameter threaded hole section protrudes out of the top surface of the mounting groove. The screw portion of the second hollow bolt 60 is screwed in the large-diameter threaded hole section. The outer side wall of one end of the screw portion of the second hollow bolt 60 close to the rotating portion is a cylindrical wall surface, which is a cylindrical portion, and a radial through hole is formed thereon, and the radial through hole is connected to the central through hole of the screw portion of the second hollow bolt 60.

[0023] The cylindrical portions of the first hollow bolt 40 and the second hollow bolt 60 are clamped on the inner sidewalls of the corresponding annular portions 51 , and the radial through holes are communicated with the annular grooves of the corresponding annular portions 51 .

[0024] Two washers are inserted on the cylindrical parts of the first hollow bolt 40 and the second hollow bolt 60, and the annular part 51 is clamped between the two corresponding washers. The outer end face of one washer presses against the end face of the rotating part of the first hollow bolt 40 or the second hollow bolt 60, and one end face of the other washer at the first hollow bolt 40 presses against the inner end face of the oil inlet connector 30, and one end face of the other washer at the second hollow bolt 60 presses against the top face of the mounting groove.

[0025] The one-way valve 70 includes a valve body 71 with an external thread, which is threaded in the large-diameter threaded hole section of the oil inlet vertical hole 21. A downwardly extending sleeve extension portion 72 is formed in the middle of the bottom end surface of the valve body 71, which is inserted into the central through hole of the screw portion of the second hollow bolt 60. A first sealing ring 1 is clamped between the top end surface of the screw portion of the second hollow bolt 60 and the bottom end surface of the valve body 71, and the first sealing ring 1 is inserted into the sleeve extension portion 72.

[0026] The top of the valve body 71 is inserted into the transition hole section of the vertical oil inlet hole 21, and an intermediate sealing ring is sandwiched between the top outer wall of the valve body 71 and the inner wall of the transition hole section of the vertical oil inlet hole 21;

[0027] A central stepped through hole is formed in the middle of the valve body 71, the upper part of the central stepped through hole is a small diameter hole section, and the lower part is a large diameter hole section. An inner annular mounting groove is formed on the inner side wall of the bottom end of the large diameter hole section, and the edge of the bottom annular blocking ring body 73 is in the inner annular mounting groove and fixed on the top surface of the inner annular groove. A first sealing ring is sandwiched between the top surface of the edge of the bottom annular blocking ring body 73 and the top surface of the inner annular mounting groove. The edge of the top surface of the large diameter hole section is formed with an upper mounting annular groove extending upward. The valve core plate 74 is inserted into the large diameter hole section, and the bottom edge of the valve core plate 74 is pressed against the top surface of the bottom annular blocking ring body 73 and covers the middle through hole of the bottom annular blocking ring body 73. A second sealing ring is nested in the annular groove on the top surface of the bottom annular blocking ring body 73, and the bottom edge of the valve core plate 74 is pressed against the top surface of the second sealing ring. There is a flow gap between the side wall of the valve core plate 74 and the inner side wall of the large diameter hole section.

[0028] A limiting sleeve 741 extending upward is formed in the middle of the top surface of the valve core plate 74, and the limiting sleeve 741 is inserted in the lower part of the small diameter hole section. The outer wall of the limiting sleeve 741 is close to the lower inner wall of the small diameter hole section, and a return spring 75 is inserted in the upper mounting annular groove. The top end of the return spring 75 forces on the top surface of the upper mounting annular groove, and the bottom end of the return spring 75 forces on the top surface of the edge of the valve core plate 74. A plurality of side flow through holes 76 are formed on the lower inner wall of the small diameter hole section, and the side flow through holes 76 are communicated with the upper mounting annular groove.

[0029] When this embodiment is in use, the outer end of the oil inlet connector 30 is connected to the oil inlet pipe, and the external oil can enter the first hollow bolt 40 from the oil inlet connector 30, and then enter the insulating hose 50 through the corresponding annular portion 51, and then enter the second hollow bolt 40 from the other annular portion 51, and then enter through the middle through hole of the bottom annular blocking ring body 73 to push the valve core plate 74 upward, and the reset spring 75 is tightened, so that the oil can enter from the gap between the bottom annular blocking ring body 73 and the valve core plate 74, and then flow upward from the flow gap between the side wall of the valve core plate 74 and the inner wall of the large diameter hole section, and enter from the side flow through hole 76 into the small diameter hole section of the central stepped through hole of the valve body 71, and then, spray from the inner end of the oil inlet vertical hole 21 onto the inner wall of the bearing shell 20 to achieve lubrication.

[0030] When the oil is not flushed, the reset spring 75 is elastically reset. At the same time, when the oil flows back along the vertical oil inlet hole 21, the valve core plate 74 is pressed down, so that the edge of its bottom surface is pressed against the top surface of the bottom annular blocking ring body 73 and covers the middle through hole of the bottom annular blocking ring body 73. The edge of the bottom surface of the valve core plate 74 is pressed against the top surface of the second sealing ring to achieve sealing. At this time, the oil cannot flow back, and the anti-backflow effect is good.

Claims

1. A high-pressure oil-top structure for preventing backflow of sliding bearings for large motors, comprising a bearing seat (10) and a bearing bush (20) installed in the bearing seat (10), characterized in that: An oil inlet connector (30) is fixed on the side plate of the bearing seat (10), the inner end of the oil inlet connector (30) extends into the bearing seat (10), one end of an insulating hose (50) is fixed to the inner end of the oil inlet connector (30) via a first hollow bolt (40), the other end of the insulating hose (50) is fixed to the bearing shell (20) via a second hollow bolt (60), one end of the insulating hose (50) is connected to the oil inlet connector (30), and the other end is connected to an upwardly extending vertical oil inlet hole (21) formed at the bottom end of the bearing shell (20), and the inner end of the vertical oil inlet hole (21) extends out of the inner side wall of the bearing shell (20); A one-way valve (70) is installed at the inner end of the vertical oil inlet hole (21), and the oil inlet port of the one-way valve (70) is in communication with the vertical oil inlet hole (21).

2. According to claim 1, a high-pressure oil-top structure for preventing backflow of sliding bearings for large motors is characterized by: A fixing plate (11) is fixedly connected to the outer wall of the side plate of the bearing seat (10) by bolts, and a through hole is formed in the middle of the fixing plate (11), which is communicated with and corresponds to a first screw-connected through hole (13) on the side plate of the bearing seat (10). The oil inlet connector (30) is inserted into the corresponding through hole and screwed into the first screw-connected through hole (13). The inner end surface of the rotating part of the outer end of the oil inlet connector (30) is pressed against the outer wall surface of the fixing plate (11), and the inner end surface of the fixing plate (11) is pressed against the outer wall of the side plate of the bearing seat (10). The inner end of the oil inlet connector (30) extends out of the inner wall of the side plate of the bearing seat (10). An axially extending oil inlet through hole is formed in the middle of the oil inlet connector (30), and both ends of the oil inlet through hole are formed with internal threads.

3. The anti-backflow high-pressure oil-top structure for sliding bearings for large motors according to claim 2, characterized in that: Both ends of the insulating hose (50) are formed with an annular portion (51), and an annular groove is formed on the inner side of the annular portion (51), the annular groove is communicated with the annular cavity inside the annular portion (51), and the two annular cavities are communicated with the through hole in the middle of the insulating hose (50), the screw portion of the first hollow bolt (40) is screwed on the internal thread of the inner end of the oil inlet connector (30), the central through hole of the screw portion of the first hollow bolt (40) is communicated with the oil inlet through hole of the oil inlet connector (30), and the outer wall of one end of the screw portion of the first hollow bolt (40) close to the rotating portion is a cylindrical wall surface, which is a cylindrical portion, and a radial through hole is formed on it, and the radial through hole is communicated with the central through hole of the screw portion of the first hollow bolt (40); A mounting groove is formed on one side of the bottom end of the bearing shell (20), the top surface of the mounting groove is a horizontal surface, and a vertical oil inlet hole (21) is formed on the top surface of the mounting groove, which extends inward and protrudes from the inner wall of the bearing shell (20). The vertical oil inlet hole (21) is a stepped through hole, which includes a large-diameter threaded hole section at the outer end, a transition hole section in the middle, and a small-diameter hole section at the inner end. One end of the transition hole section is connected to the large-diameter threaded hole section, and the other end is connected to the small-diameter hole section. The inner end of the small-diameter hole section protrudes from the inner wall of the bearing shell (20), and the outer end of the large-diameter threaded hole section protrudes from the top surface of the mounting groove. The screw portion of the second hollow bolt (60) is screwed into the large-diameter threaded hole section. The outer side wall of the end of the screw portion of the second hollow bolt (60) close to the rotating portion is a cylindrical wall surface, which is a cylindrical portion, and a radial through hole is formed on it, and the radial through hole is connected to the central through hole of the screw portion of the second hollow bolt (60); The cylindrical portion of the first hollow bolt (40) and the cylindrical portion of the second hollow bolt (60) are clamped on the inner side wall of the corresponding annular portion (51), and the radial through hole is communicated with the annular groove of the annular portion (51).

4. The anti-backflow high-pressure oil-top structure for sliding bearings for large motors according to claim 3, characterized in that: Two washers are inserted into the cylindrical parts of the first hollow bolt (40) and the second hollow bolt (60), and the annular part (51) is clamped between the two corresponding washers. The outer end face of one washer is pressed against the end face of the rotating part of the first hollow bolt (40) or the second hollow bolt (60), one end face of the other washer at the first hollow bolt (40) is pressed against the inner end face of the oil inlet connector (30), and one end face of the other washer at the second hollow bolt (60) is pressed against the top face of the mounting groove.

5. The anti-backflow high-pressure oil-top structure for sliding bearings for large motors according to claim 1, characterized in that: The one-way valve (70) comprises a valve body (71) with an external thread. The valve body (71) is threaded in the large-diameter threaded hole section of the oil inlet vertical hole (21). A sleeve extension portion (72) extending downward is formed in the middle of the bottom end surface of the valve body (71) and is inserted into the central through hole of the screw portion of the second hollow bolt (60). A first sealing ring (1) is clamped between the top end surface of the screw portion of the second hollow bolt (60) and the bottom end surface of the valve body (71). The first sealing ring (1) is inserted into the sleeve extension portion (72).

6. The anti-backflow high-pressure oil-top structure for sliding bearings for large motors according to claim 5, characterized in that: The top of the valve body (71) is inserted into the transition hole section of the oil inlet vertical hole (21), and a central stepped through hole is formed in the middle of the valve body (71). The upper part of the central stepped through hole is a small diameter hole section, and the lower part is a large diameter hole section. An inner annular mounting groove is formed on the inner side wall of the bottom end of the large diameter hole section. The edge of the bottom annular blocking ring body (73) is located in the inner annular mounting groove and fixed on the top surface of the inner annular groove. A first sealing ring is sandwiched between the top surface of the edge of the bottom annular blocking ring body (73) and the top surface of the inner annular mounting groove. The edge of the top surface of the hole section is formed with an upper mounting annular groove extending upward, the valve core plate (74) is inserted into the large diameter hole section, the bottom edge of the valve core plate (74) is pressed against the top surface of the bottom annular blocking ring body (73) and covers the middle through hole of the bottom annular blocking ring body (73), a second sealing ring is nested in the annular groove on the top surface of the bottom annular blocking ring body (73), the bottom edge of the valve core plate (74) is pressed against the top surface of the second sealing ring, and a flow gap is provided between the side wall of the valve core plate (74) and the inner side wall of the large diameter hole section; A limit sleeve (741) extending upward is formed in the middle of the top surface of the valve core plate (74), and the limit sleeve (741) is inserted into the lower part of the small diameter hole section, and the outer wall of the limit sleeve (741) is tightly attached to the lower inner wall of the small diameter hole section. A return spring (75) is inserted into the upper mounting annular groove, and the top end of the return spring (75) is applied to the top surface of the upper mounting annular groove, and the bottom end of the return spring (75) is applied to the top surface of the edge of the valve core plate (74). A plurality of side flow through holes (76) are formed on the lower inner wall of the small diameter hole section, and the side flow through holes (76) are communicated with the upper mounting annular groove.

Images