Hard metal guide bearing positioning structure for high temperature pumps

Abstract

The application discloses a hard alloy guide bearing positioning structure for a high-temperature pump, which comprises a bearing seat and a shaft, a bearing hole is arranged through the bearing seat, a guide bearing is mounted in the bearing hole in a concentric line, the shaft passes through the inner hole of the guide bearing in the direction of the guide bearing center line, inner rebates in the same center line with the bearing hole are arranged at the positions of the bearing seat at both ends of the bearing hole, positioning rings are respectively arranged on the shaft at the positions of the bearing hole at both ends, the positioning rings are arranged in the same center line with the bearing hole, the positioning rings are in clearance fit with the shaft, the positioning ring comprises an outer ring embedded in the inner rebate at the side of the positioning ring, a convex ring in the same center line is formed on the side surface of the side of the outer ring facing the bearing hole, the convex ring extends into the stepped inner hole of the guide bearing at the side of the convex ring and abuts on the hole bottom of the stepped inner hole of the guide bearing, a clearance is arranged between the convex ring and the hole wall of the stepped inner hole of the guide bearing, and the material thermal expansion coefficient of the positioning ring is greater than the material thermal expansion coefficient of the guide bearing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature pumps, in particular to a hard alloy guide bearing positioning structure for high-temperature pumps. BACKGROUND

[0002] High-temperature pumps are driven by motors or pneumatic motors, can transport high-temperature medium, especially high-temperature metal liquid medium, and are widely used in the fields of petroleum, chemical industry, metallurgy and electroplating. When a hard alloy guide bearing lubricated by high-temperature medium is arranged in the pump, because the thermal expansion coefficients of the materials are inconsistent, the material of the guide bearing is hard alloy, and the thermal expansion coefficient thereof is small, while the material of the bearing seat is austenitic, martensitic, duplex steel or the like, and the thermal expansion coefficient thereof is large. Because the assembly of the guide bearing is carried out at normal temperature, the size of the bearing seat subjected to thermal expansion is larger than that of the guide bearing subjected to thermal expansion at a high-temperature working state, so that a large gap is caused between the outer circle of the guide bearing and the inner hole of the bearing seat, and the larger the temperature or the bearing size, the larger the gap value, thereby making the guide bearing unable to be positioned and different from the rotor, and seriously affecting the service life of the guide bearing. SUMMARY

[0003] In view of the above problems of the prior art, the technical problem to be solved by the present application is to provide a hard alloy guide bearing positioning structure for high-temperature pumps, which can position the guide bearing at a high-temperature state.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] The hard alloy guide bearing positioning structure for high-temperature pumps comprises a bearing seat and a shaft, a bearing hole is arranged through the bearing seat, a guide bearing is mounted in the bearing hole along the center line, the shaft passes through the inner hole of the guide bearing along the center line direction of the guide bearing, inner rebate holes which are coaxial with the bearing hole are arranged at the positions of the bearing seat at both ends of the bearing hole, positioning rings are respectively arranged on the shaft at the positions of the bearing hole at both ends, the positioning rings are arranged coaxially with the bearing hole, the positioning rings are gap-fitted with the shaft, the positioning ring comprises an outer ring which is embedded in the inner rebate hole at the side thereof, a convex ring which is coaxial with the center line is formed on the side surface of the outer ring facing the bearing hole, the convex ring extends into the stepped inner hole of the guide bearing at the side thereof and abuts on the bottom of the stepped inner hole of the guide bearing, a gap is arranged between the convex ring and the hole wall of the stepped inner hole of the guide bearing, and the material thermal expansion coefficient of the positioning ring is greater than the material thermal expansion coefficient of the guide bearing.

[0006] In the application, the outer circular ring is embedded in the inner rebate, the outer circular ring is positioned with the bearing seat through the inner rebate, in normal temperature state, the convex ring does not contact with the guide bearing, and the guide bearing is still positioned by the bearing seat. In high temperature state, the bearing seat, the positioning ring and the guide bearing all expand, but the expansion amount of the bearing seat and the positioning ring is greater than that of the guide bearing, a gap is generated between the bearing seat and the guide bearing, so that the bearing seat can no longer position the guide bearing, and at this time, after the positioning ring expands, the convex ring can abut against the stepped inner hole wall of the guide bearing, the guide bearing can be positioned by the positioning ring at both ends, that is, the center of the bearing seat is transmitted to the guide bearing through the positioning ring.

[0007] As an optimization, the material thermal expansion coefficients of the bearing seat and the positioning ring are consistent. The expansion amount can be better controlled.

[0008] As an optimization, the gap value between the convex ring and the stepped inner hole wall of the guide bearing is calculated by the following formula: l 间隙 =(λ 定位环 -λ 导轴承 )×D×(T-20)

[0009] Wherein λ 轴承座 is the material thermal expansion coefficient of the bearing seat, λ 导轴承 is the material thermal expansion coefficient of the guide bearing, D is the nominal size of the convex ring matched with the guide bearing, and T is the medium temperature. The gap value between the convex ring and the stepped inner hole wall of the guide bearing is calculated, so that the deformation control is more accurate at high temperature, and the positioning precision of the guide bearing is higher.

[0010] Compared with the prior art, the application has the advantages of simple structure, can position the guide bearing in normal temperature and high temperature state, makes the guide bearing always keep concentric with the rotor, and improves the service life. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is the sectional view of the application in normal temperature state;

[0012] Figure 2 is the sectional view of the application in high temperature state. DETAILED DESCRIPTION

[0013] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0014] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present application, it should also be explained that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0015] As Figure 1 and Figure 2As shown, the hard alloy guide bearing positioning structure for high temperature pump in the embodiment comprises a bearing seat 1 and a shaft 2, the bearing seat 1 is provided with a bearing hole, a guide bearing 3 is concentrically arranged in the bearing hole, the shaft 2 passes through the inner hole of the guide bearing 3 along the center line direction of the guide bearing 3, the bearing seat 1 is provided with an inner rebate at the position of both ends of the bearing hole, the shaft 2 is provided with a positioning ring 4 at the position of both ends of the bearing hole, the positioning ring 4 is arranged concentrically with the bearing hole, the positioning ring 4 is in clearance fit with the shaft 2, the positioning ring 4 comprises an outer ring embedded in the inner rebate at the side of the positioning ring 4, a convex ring is formed on the side surface of the outer ring facing the bearing hole, the convex ring extends into the stepped inner hole of the guide bearing 3 at the side of the convex ring and abuts on the bottom of the stepped inner hole of the guide bearing 3, a gap is arranged between the convex ring and the hole wall of the stepped inner hole of the guide bearing 3, the thermal expansion coefficient of the material of the positioning ring 4 is greater than the thermal expansion coefficient of the material of the guide bearing 3.

[0016] In the embodiment, the thermal expansion coefficients of the materials of the bearing seat 1 and the positioning ring 4 are consistent.

[0017] In the embodiment, the gap value between the convex ring and the hole wall of the stepped inner hole of the guide bearing 3 is calculated by the following formula:

[0018] l 间隙 =(λ 定位环 -λ 导轴承 )×D×(T-20)

[0019] Wherein λ 轴承座 is the thermal expansion coefficient of the material of the bearing seat 1, λ 导轴承 is the thermal expansion coefficient of the material of the guide bearing 3, D is the nominal size of the convex ring and the guide bearing 3, and T is the medium temperature.

[0020] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described by referring to the preferred embodiments of the present application, those skilled in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the present application defined in the appended claims.

Claims

1. A positioning structure for a hard alloy guide bearing for a high-temperature pump, comprising a bearing housing and a shaft, wherein a bearing hole is provided on the bearing housing, a guide bearing is installed concentrically within the bearing hole, and the shaft passes through the inner hole of the guide bearing along the centerline of the guide bearing, characterized in that: The bearing seat is provided with an inner rebate coaxial with the bearing hole at positions on both ends of the bearing hole, and a positioning ring is sleeved on the shaft at positions on both ends of the bearing hole, the positioning ring is coaxial with the bearing hole, the positioning ring is in clearance fit with the shaft, the positioning ring comprises an outer ring embedded in the inner rebate on the side thereof, a convex ring coaxial with the center line is formed on the side surface of the outer ring facing the bearing hole, the convex ring extends into the stepped inner hole of the guide bearing on the side thereof and abuts on the bottom of the stepped inner hole of the guide bearing, a clearance is provided between the convex ring and the wall of the stepped inner hole of the guide bearing, and the thermal expansion coefficient of the material of the positioning ring is greater than the thermal expansion coefficient of the material of the guide bearing.

2. A hard metal guide bearing positioning structure for a high temperature pump according to claim 1, characterized in that: The thermal expansion coefficients of the materials of the bearing seat and the positioning ring are consistent.

3. A hard metal guide bearing positioning structure for a high temperature pump according to claim 1, characterized in that: The clearance value between the convex ring and the wall of the stepped inner hole of the guide bearing is calculated by the following formula: l 间隙 = (λ 定位环 - λ 导轴承 ) x D x (T - 20) where λ 轴承座 is the thermal expansion coefficient of the material of the bearing seat, λ 导轴承 is the thermal expansion coefficient of the material of the guide bearing, D is the nominal size of the fitting of the convex ring with the guide bearing, and T is the temperature of the medium.

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