Positioning system for rolling bearing of rotary pressure valve

Abstract

The invention discloses a positioning system for a rolling bearing of a rotary pressure valve, which is provided with a first positioning shaft sleeve and a second positioning shaft sleeve, the first positioning shaft sleeve is directly contacted and fixed with an inner ring of the bearing, and the second positioning shaft sleeve indirectly fixes the inner ring of the bearing through a chain wheel and the first positioning shaft sleeve. And inner ring displacement caused by bearing thermal expansion difference interference failure when the rotary pressure valve works is effectively avoided. And by setting the range of interference connection between the rotor shaft and the bearing inner ring, the first positioning shaft sleeve and the chain wheel, the stability of connection between all the parts is guaranteed. The rotary pressure valve effectively solves the technical problem that in the prior art, an inner ring of a rolling bearing of the rotary pressure valve moves in the axial direction, and is suitable for severe industrial scenes such as PTA and petrifaction.

Description

Technical Field

[0001] The invention relates to the field of rotary pressure valves, and in particular to a positioning system for a rolling bearing of a rotary pressure valve. Background Art

[0002] In the purified terephthalic acid (PTA) production unit, the pressure rotary valve is the core equipment for material transportation and pressure regulation. Its operation stability is directly related to the continuity and energy efficiency level of the whole process unit. In the prior art, the free end of the pressure rotary valve generally adopts a roller bearing as the radial support structure of the rotor shaft. The inner ring of the bearing and the rotor shaft adopt a shrink-fit interference fit, and the outer ring is fixed to the valve body side plate through a gland.

[0003] However, in the PTA production process, since the reaction temperature is maintained at a high temperature environment of 280-320°C for a long time, and there is a significant difference in thermal expansion between the rotor shaft and the inner ring of the bearing, the interference fit amount in actual operation changes dynamically with temperature fluctuations. When the temperature rise exceeds 150°C, the theoretical interference fit amount may decay to below 0.01mm, thereby causing axial displacement of the inner ring of the bearing.

[0004] Therefore, it is urgent for those skilled in the art to provide a positioning device for a rotary pressure valve rolling bearing to avoid axial displacement of the inner ring of the bearing. Summary of the invention

[0005] The invention provides a positioning system for a rolling bearing of a rotary pressure valve, which is used to solve the technical problem of axial displacement of the inner ring of the rolling bearing of the rotary pressure valve in the prior art.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is: a positioning system for a rolling bearing of a rotary pressure valve, which is applied to a rolling bearing fixedly arranged in a cavity of a rotary pressure valve, wherein the rolling bearing comprises a bearing inner ring and a bearing outer ring, and comprises:

[0007] The rotor shaft is sleeved inside the inner ring of the bearing and is interference-connected with the inner ring of the bearing;

[0008] The first positioning sleeve is sleeved on the rotor shaft, is interference-connected with the inner ring of the shaft, and contacts the outer end surface of the inner ring of the bearing;

[0009] A sealing ring is sleeved on the end of the bearing outer ring and is in axial contact with the bearing outer ring;

[0010] Double lip seal, assembled inside the sealing ring, is used to prevent the lubricating grease in the rolling bearing from leaking and to block external contaminants from invading the rolling bearing;

[0011] A positioning clamping ring, one end of which contacts the sealing ring, and the other end away from the sealing ring is clamped with the side cover of the rotary valve;

[0012] A sprocket, sleeved on the rotor shaft and in contact with the outer end surface of the first positioning sleeve, is interference-connected with the rotor shaft, and is used to connect with an external power mechanism and drive the rotor shaft;

[0013] The second positioning sleeve is concavely sleeved on one end of the rotor shaft, the outer end of the second positioning sleeve contacts the outer end surface of the sprocket, the inner end of the second positioning sleeve contacts the outer end surface of the rotor shaft and is fixed to the positioning screw hole on the side of the rotor shaft through a positioning nut.

[0014] Preferably, the interference fit between the inner ring of the bearing and the rotor shaft is in the range of 0.05-0.08 mm.

[0015] Preferably, the interference fit between the first positioning sleeve and the rotor shaft is in the range of 0.02-0.08 mm.

[0016] Preferably, the interference fit between the sprocket and the rotor shaft is in the range of 0.01-0.03 mm.

[0017] Preferably, the first positioning sleeve is made of 2205 duplex stainless steel with a surface hardness ≥ HV800.

[0018] Preferably, the sealing ring is made of 304 stainless steel, and the double-lip sealing material is made of FKM rubber material.

[0019] Preferably, the positioning nut comprises a nut body and an elastic washer, and the elastic washer is used to prevent the nut from loosening.

[0020] The present invention has the following beneficial effects:

[0021] 1. A positioning system for a rolling bearing of a rotary pressure valve of the present invention is provided with a first positioning sleeve and a second positioning sleeve. The first positioning sleeve is directly contacted and fixed to the inner ring of the bearing, and the second positioning sleeve is indirectly fixed to the inner ring of the bearing through a sprocket and the first positioning sleeve, thereby effectively avoiding the displacement of the inner ring caused by interference failure due to thermal expansion difference of the bearing when the rotary pressure valve is working.

[0022] 2. The present invention ensures the stability of the connection between the various components by setting the range of interference connection between the rotor shaft and the inner ring of the bearing, the first positioning sleeve and the sprocket respectively.

[0023] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 It is a structural schematic diagram of a positioning system of a rotary pressure valve rolling bearing of the present invention;

[0026] The numbers represent:

[0027] 1. Rolling bearing; 2. Bearing outer ring; 3. Bearing inner ring; 4. Rotor shaft; 5. First positioning sleeve; 6. Sealing ring; 7. Positioning retaining ring; 8. Sprocket; 9. Second positioning sleeve; 10. Positioning nut. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0029] See also Figure 1 A positioning system for a rotary pressure valve rolling bearing is used to fix a rolling bearing 1 in a rotary pressure valve cavity, wherein the rolling bearing 1 includes a bearing inner ring 3 and a bearing outer ring 2, and includes:

[0030] The rotor shaft 4 is sleeved inside the bearing inner ring 3 and is interference-connected with the bearing inner ring 3;

[0031] The first positioning sleeve 5 is sleeved on the rotor shaft 4, is interference-connected with the shaft inner ring, and contacts the outer end surface of the bearing inner ring 3;

[0032] The sealing ring 6 is sleeved on the end of the bearing outer ring 2 and is in axial contact with the bearing outer ring 2;

[0033] A double lip seal, assembled inside the sealing ring 6, is used to prevent the lubricating grease in the rolling bearing 1 from leaking and to block external contaminants from invading the rolling bearing 1;

[0034] A positioning clamping spring 7, one end of which contacts the sealing ring 6, and the other end away from the sealing ring 6 is clamped with the side cover of the rotary valve;

[0035] The sprocket 8 is sleeved on the rotor shaft 4 and contacts the outer end surface of the first positioning sleeve 5, and is interference-connected with the rotor shaft 4, and is used to connect with an external power mechanism and drive the rotor shaft 4;

[0036] The second positioning sleeve 9 is concavely sleeved on one end of the rotor shaft 4, and the outer end of the second positioning sleeve 9 contacts the outer end surface of the sprocket 8, and the inner end of the second positioning sleeve 9 contacts the outer end surface of the rotor shaft 4 and is fixed to the positioning screw hole on the side of the rotor shaft 4 through the positioning nut 10.

[0037] In another embodiment, a Φ5 mm anti-rotation pin hole is provided on the outer side of the first positioning sleeve 5, and a cylindrical pin is installed therein, with H7 / g6 matching to limit circumferential displacement.

[0038] Optionally, the interference fit between the bearing inner ring 3 and the rotor shaft 4 is in the range of 0.05-0.08 mm. Suitable for high temperature, heavy load, and creep resistance environments.

[0039] Optionally, the interference fit between the first positioning sleeve 5 and the rotor shaft 4 is in the range of 0.02-0.08 mm. High temperature, heavy load, creep resistance

[0040] Optionally, the interference fit between the sprocket 8 and the rotor shaft 4 is in the range of 0.01-0.03 mm. Medium transmission load ensures the detachability of the sprocket 8

[0041] Optionally, the first positioning sleeve 5 is made of 2205 duplex stainless steel with a surface hardness ≥ HV800 and is solution treated to improve wear resistance and creep resistance.

[0042] In another embodiment, a vibration sensor may be fixedly installed on the first positioning sleeve 5, and an early warning is triggered when an axial displacement threshold value > 0.1 mm is set.

[0043] Optionally, the sealing ring 6 is made of 304 stainless steel, and the double-lip sealing material is made of FKM rubber material, which is a synthetic polymer elastomer containing fluorine atoms. The introduction of fluorine atoms gives this material excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance, so as to ensure better sealing during normal operation.

[0044] Optionally, the positioning nut 10 includes a nut body and an elastic washer, and the elastic washer is used to prevent the nut from loosening.

[0045] It has been verified that the positioning system of the rotary pressure valve rolling bearing of the present invention can ensure that the rolling bearing 1 is continuously loaded with the rated load for 500 hours at a constant temperature of 300°C, with an axial displacement of ≤0.05mm; random vibration of Grms=8.5 is applied according to the ISO 10816-3 standard, and there is no loosening failure for a total of 200 hours; and grease leakage is <0.1g / h after running for 1000 hours under a pressure difference of 0.4MPa.

[0046] In summary, the positioning system of the rolling bearing of a rotary pressure valve of the present invention is provided with a first positioning sleeve 5 and a second positioning sleeve 9, wherein the first positioning sleeve 5 is directly contacted and fixed with the inner ring 3 of the bearing, and the second positioning sleeve 9 is indirectly fixed to the inner ring 3 of the bearing through the sprocket 8 and the first positioning sleeve 5, which effectively avoids the displacement of the inner ring caused by interference failure due to the difference in thermal expansion of the bearing when the rotary pressure valve is working. And by setting the range of interference connection of the rotor shaft 4 with the inner ring 3 of the bearing, the first positioning sleeve 5 and the sprocket 8 respectively, the stability of the connection between the various components is guaranteed. The present invention effectively solves the technical problem of axial displacement of the inner ring of the rolling bearing of the rotary pressure valve in the prior art and is suitable for harsh industrial scenarios such as PTA and petrochemicals.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positioning system for a rolling bearing of a rotary pressure valve, used for fixing a rolling bearing in a cavity of a rotary pressure valve, wherein the rolling bearing comprises an inner ring and an outer ring of the bearing, and is characterized in that: include: The rotor shaft is sleeved inside the inner ring of the bearing and is interference-connected with the inner ring of the bearing; A first positioning sleeve, sleeved on the rotor shaft, is interference-connected with the shaft inner ring, and contacts the outer end surface of the bearing inner ring; A sealing ring, sleeved on the end of the bearing outer ring and in axial contact with the bearing outer ring; A double-lip seal, assembled in the sealing ring, is used to prevent the lubricating grease in the rolling bearing from leaking and to block external contaminants from invading the rolling bearing; A positioning clamping spring, one end of which contacts the sealing ring and the other end away from the sealing ring is clamped with the side cover of the rotary valve; a sprocket, sleeved on the rotor shaft and in contact with the outer end surface of the first positioning sleeve, and having an interference connection with the rotor shaft, and used for connecting with an external power mechanism and transmitting the rotor shaft; The second positioning sleeve is concavely sleeved on one end of the rotor shaft, the outer end of the second positioning sleeve contacts the outer end surface of the sprocket, the inner end of the second positioning sleeve contacts the outer end surface of the rotor shaft and is fixed to the positioning screw hole on the side of the rotor shaft through a positioning nut.

2. According to the positioning system of the rotary pressure valve rolling bearing of claim 1, the interference connection range between the inner ring of the bearing and the rotor shaft is 0.05-0.08 mm. 3 . According to the positioning system of the rolling bearing of the rotary pressure valve according to claim 1 , the interference connection range between the first positioning sleeve and the rotor shaft is 0.02-0.08 mm.

4. According to the positioning system of the rolling bearing of the rotary pressure valve as claimed in claim 1, the interference connection range between the sprocket and the rotor shaft is 0.01-0.03 mm.

5. The positioning system for the rolling bearing of a rotary pressure valve according to claim 1, characterized in that: The first positioning sleeve is made of 2205 duplex stainless steel, and the surface hardness is ≥ HV800.

6. The positioning system for the rolling bearing of a rotary pressure valve according to claim 1, characterized in that: The sealing ring is made of 304 stainless steel, and the double-lip sealing material is made of FKM rubber material.

7. The positioning system for the rolling bearing of a rotary pressure valve according to claim 1, characterized in that: The positioning nut comprises a nut body and an elastic washer, and the elastic washer is used to prevent the nut from loosening.

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