Bearing seat for guide bearing installation and guide bearing elastic supporting structure for high-temperature pump

Abstract

The bearing seat comprises a bearing seat body, a guide bearing mounting hole is formed in the bearing seat body in a penetrating mode, and a plurality of variable-rigidity elastic units are evenly formed on the inner wall of the guide bearing mounting hole in a protruding mode at intervals in the direction of the center line of the guide bearing mounting hole. The side, facing the center of the guide bearing mounting hole, of the variable-stiffness elastic unit is provided with a matching face capable of being matched with the peripheral face of the guide bearing, and all the matching faces are located on the circumferential face with the same center line as the guide bearing mounting hole. The invention further discloses a guide bearing elastic supporting structure for the high-temperature pump, the guide bearing elastic supporting structure comprises the bearing seat body and a pump shaft, a guide bearing is arranged in a guide bearing mounting hole in the same center line mode, and the peripheral face of the guide bearing is in interference fit with the matching faces of the variable-rigidity elastic units. Positioning rings are fixed to the positions, corresponding to the two ends of the guide bearing, of the bearing seat body respectively, the pump shaft penetrates through the guide bearing in the center line direction of the guide bearing, and the position, corresponding to the guide bearing, of a shaft body of the pump shaft is sleeved with a shaft sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature pumps, and in particular to a bearing seat for installing a guide bearing and an elastic support structure of a guide bearing for a high-temperature pump. Background Art

[0002] A high temperature pump is a pump specially designed for conveying high temperature liquids above 200°C. The guide bearing material in the pump is cemented carbide, and the thermal expansion coefficient is about 6×10 -6 mm / ℃, while the bearing seat material is austenitic stainless steel, with a thermal expansion coefficient of approximately 17×10 -6 mm / ℃, the clearance value is zero at room temperature. When high-temperature liquid is present, the different materials of the guide bearing and the bearing seat cause them to expand to different sizes, which will cause a gap between the guide bearing and the bearing seat. If the gap value is too large, the bearing seat will not be able to position and support the guide bearing, causing the guide bearing to be unable to position and become non-concentric with the rotor, which will not only affect the normal operation of the mechanical equipment, but also shorten the service life of the equipment. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a bearing seat for guide bearing installation that can stably position and support the guide bearing at room temperature and high temperature.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A bearing seat for installing a guide bearing comprises a bearing seat body, a guide bearing installation hole is formed on the bearing seat body, a plurality of variable stiffness elastic units are formed on the inner wall of the guide bearing installation hole at uniform intervals around the center line direction of the guide bearing installation hole, the variable stiffness elastic unit has a mating surface that can cooperate with the outer circumferential surface of the guide bearing on the side facing the direction of the center of the guide bearing installation hole, and all the mating surfaces are located on the circumferential surface that is coaxial with the guide bearing installation hole.

[0006] In the present invention, the guide bearing is interference mounted in the guide bearing mounting hole at room temperature, and the variable stiffness elastic unit formed by the protrusion in the guide bearing mounting hole can not only effectively position and support the guide bearing at room temperature, but also absorb the expansion difference between the guide bearing and the bearing seat in a high temperature environment, ensuring that there is a certain amount of interference between the guide bearing and the bearing seat when the high-temperature pump is running in a high temperature environment, preventing the outer circle of the guide bearing and the inner hole of the bearing seat from having a gap, thereby improving the stability of the equipment operation.

[0007] As an optimization, the variable stiffness elastic unit is a cantilever elastic piece tilted in a clockwise or counterclockwise direction toward the guide bearing mounting hole, and all cantilever elastic pieces are tilted in the same direction. At room temperature, due to the large expansion difference between the outer circle of the guide bearing and the inner hole of the bearing seat, in order to prevent the cantilever elastic piece from plastic deformation, the structural parameters of the cantilever elastic piece, such as the cantilever length and the number of cantilever elastic pieces, must be continuously adjusted during the design process.

[0008] As an optimization, the cantilever elastic sheet is flush with the two side openings of the guide bearing mounting hole along the center line direction of the guide bearing mounting hole, and the mating surface is extended parallel to the center line of the guide bearing mounting hole, and its two ends are flush with the two side openings of the guide bearing mounting hole.

[0009] As an optimization, the root thickness of the cantilever elastic sheet is greater than the end thickness of the cantilever elastic sheet, which can also prevent the cantilever elastic sheet from plastic deformation.

[0010] The present invention also discloses an elastic support structure of a guide bearing for a high-temperature pump, comprising a bearing seat and a pump shaft. The bearing seat is the bearing seat for installing the guide bearing as described above. A guide bearing is arranged coaxially in the guide bearing installation hole. The outer peripheral surface of the guide bearing is interference fit with the mating surface of each variable stiffness elastic unit. Positions on the bearing seat body corresponding to the two ends of the guide bearing are respectively fixedly connected with positioning rings for limiting the movement of the guide bearing along the center line of the guide bearing. The pump shaft passes through the guide bearing in the direction of the center line of the guide bearing. A sleeve coaxially with the pump shaft is mounted on the shaft body of the pump shaft at a position corresponding to the guide bearing, and a gap is provided between the sleeve and the guide bearing.

[0011] As an optimization, the two ends of the guide bearing along the center line direction thereof are respectively protruded outward to form positioning steps arranged on the same center line as the guide bearing, the material of the positioning ring is consistent with the material of the bearing seat body, the outer ring of the positioning ring is positioned with the bearing seat body through a stop, the inner ring of the positioning ring is protruded to form a ring edge that can extend into the inner side of the positioning step on its side and is arranged on the same center line as the guide bearing mounting hole, and there is a gap between the ring edge and the inner side surface of the positioning step on its side, and the size of the gap is:

[0012] l 间隙 =(λ 定位环 -λ 导轴承 )×D×(T-20)

[0013] Where: 轴承座 is the thermal expansion coefficient of the bearing seat body material, λ 导轴承is the thermal expansion coefficient of the guide bearing material, D is the nominal size of the positioning ring and the guide bearing, and T is the temperature of the high-temperature medium. At high temperatures, since the positioning ring material is consistent with the bearing seat material, the center of the bearing seat can be transferred to the positioning ring through the positioning stop; the ring edge expansion is greater than the expansion of the inner hole of the guide bearing, which just offsets the reserved gap to form a fit, and the guide bearing is positioned through the positioning rings at both ends, that is, the center of the bearing seat is transferred to the guide bearing through the positioning ring. The positioning ring and the cantilever elastic sheet are designed to be complementary to ensure the bearing seat's support stiffness for the guide bearing at high temperatures.

[0014] As an optimization, an expansion sleeve is provided between the pump shaft and the sleeve, which is sleeved on the pump shaft and coaxial with the pump shaft. The material of the expansion sleeve is consistent with that of the pump shaft. Strip holes are evenly spaced on the sleeve body around the center line of the expansion sleeve. The strip holes are extended in a direction parallel to the center line of the expansion sleeve. A support strip is formed between two adjacent strip holes. The outer side surface of the support strip and the middle position of its length direction are convexly formed with a boss for abutting against the inner wall of the sleeve. The inner side surface of the support strip is a concave arc surface. The sleeve material for grinding against the guide bearing is cemented carbide or ceramic, which is installed on the pump shaft. Due to the inconsistent thermal expansion coefficients of the materials, a large interference occurs between the inner hole of the sleeve and the outer circle of the pump shaft at high temperature. The larger the temperature or the size of the sleeve, the larger the interference, which may cause the sleeve to be cracked. The support strip formed on the expansion sleeve also adopts a variable stiffness elastic support scheme to absorb the expansion difference between the pump shaft and the sleeve. By adjusting the structural parameters of the support strips, such as the bow height, bow length, bow root and top thickness, width and number of strip holes, etc., different operating conditions can be met.

[0015] Compared with the prior art, the present invention can effectively absorb the thermal expansion difference of different materials within the elastic range and form effective support for the guide bearing and the sleeve; it enables the high-temperature pump to have a wider operating temperature range and good adaptability to a large-span operating temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A top view of a bearing seat for mounting a guide bearing in the present invention;

[0017] Figure 2 A three-dimensional structural diagram of a bearing seat for installing a guide bearing in the present invention;

[0018] Figure 3 It is a cross-sectional view of the bearing seat and the pump shaft in the present invention;

[0019] Figure 4 is a cross-sectional view of the expansion sleeve of the present invention;

[0020] Figure 5 It is a three-dimensional structural diagram of the expansion sleeve in the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0022] It should be noted that similar numbers and letters represent similar items in the following drawings, so 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 invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figure 1 and Figure 2As shown, the bearing seat for installing the guide bearing in this specific embodiment includes a bearing seat body 1, a guide bearing mounting hole is pierced through the bearing seat body 1, and a plurality of variable stiffness elastic units are formed on the inner wall of the guide bearing mounting hole by protrusions evenly spaced around the center line direction of the guide bearing mounting hole. The variable stiffness elastic unit has a mating surface that can cooperate with the outer circumferential surface of the guide bearing on the side facing the direction of the center of the guide bearing mounting hole, and all the mating surfaces are located on the circumferential surface that is coaxial with the guide bearing mounting hole.

[0024] In this specific implementation, the variable stiffness elastic unit is a cantilever elastic piece 2 that is tilted in a clockwise or counterclockwise direction toward the guide bearing mounting hole, and all the cantilever elastic pieces 2 are tilted in the same direction.

[0025] In this specific embodiment, the cantilever elastic sheet 2 is flush with the two side openings of the guide bearing mounting hole along the center line direction of the guide bearing mounting hole, and the mating surface is extended parallel to the center line of the guide bearing mounting hole, and its two ends are flush with the two side openings of the guide bearing mounting hole.

[0026] In this specific implementation, the thickness of the root of the cantilever elastic piece 2 is greater than the thickness of the end of the cantilever elastic piece 2 .

[0027] like Figures 3 to 5 As shown, a guide bearing elastic support structure for a high-temperature pump includes a bearing seat and a pump shaft 3. The bearing seat is the bearing seat for installing the guide bearing as described above. A guide bearing 4 is arranged coaxially in the guide bearing installation hole. The outer peripheral surface of the guide bearing 4 is interference fit with the mating surface of each variable stiffness elastic unit. Positions on the bearing seat body 1 corresponding to the two ends of the guide bearing 4 are respectively fixedly connected with positioning rings 5 ​​for limiting the movement of the guide bearing 4 along the center line of the guide bearing 4. The pump shaft 3 passes through the guide bearing 4 along the center line direction of the guide bearing 4. A sleeve 6 coaxial with the pump shaft 3 is mounted on the shaft body of the pump shaft 3 at a position corresponding to the guide bearing 4, and a gap is provided between the sleeve 6 and the guide bearing 4.

[0028] In this specific embodiment, the two ends of the guide bearing 4 along the center line direction thereof are respectively protruded outward to form positioning steps arranged on the same center line as the guide bearing 4, the material of the positioning ring 5 is consistent with the material of the bearing seat body 1, the outer ring of the positioning ring 5 is positioned with the bearing seat body 1 by a stopper, and the inner ring of the positioning ring 5 is protruded to form a ring edge which can extend into the inner side of the positioning step on its side and is arranged on the same center line as the guide bearing mounting hole, and there is a gap between the ring edge and the inner side surface of the positioning step on its side, and the size of the gap is:

[0029] l 间隙 =(λ 定位环 -λ 导轴承 )×D×(T-20)

[0030] Where: 轴承座 is the thermal expansion coefficient of the bearing seat body 1 material, λ 导轴承 is the thermal expansion coefficient of the guide bearing 4 material, D is the nominal size of the positioning ring 5 and the guide bearing 4, and T is the temperature of the high-temperature medium.

[0031] In this specific embodiment, an expansion sleeve 7 is provided between the pump shaft 3 and the sleeve 6, which is sleeved on the pump shaft 3 and coaxial with the pump shaft 3. The material of the expansion sleeve 7 is consistent with that of the pump shaft 3. The sleeve body of the expansion sleeve 7 is provided with strip holes evenly spaced around the center line direction of the expansion sleeve 7. The strip holes extend in a direction parallel to the center line direction of the expansion sleeve 7. A support bar is formed between two adjacent strip holes. The outer side surface of the support bar and the middle position in its length direction are convexly formed with a boss 8 for abutting against the inner wall of the sleeve 6, and the inner side surface of the support bar is a concave arched surface.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described with reference to the preferred embodiments of the present invention, it should be understood by those skilled in the art that various changes may be made in form and details without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A bearing seat for installing a guide bearing, comprising a bearing seat body, the bearing seat body is provided with a guide bearing installation hole, and is characterized in that: The inner wall of the guide bearing mounting hole is provided with a plurality of variable stiffness elastic units which are evenly spaced and raised around the center line of the guide bearing mounting hole. The variable stiffness elastic unit has a mating surface on the side facing the center of the guide bearing mounting hole that can cooperate with the outer circumferential surface of the guide bearing. All the mating surfaces are located on the circumferential surface which is coaxial with the guide bearing mounting hole.

2. The guide bearing mounting bearing seat according to claim 1, characterized in that: The variable stiffness elastic unit is a cantilever elastic piece tilted in a clockwise or counterclockwise direction toward the guide bearing mounting hole, and all the cantilever elastic pieces are tilted in the same direction.

3. The guide bearing mounting bearing seat according to claim 2, characterized in that: The two sides of the cantilever elastic sheet along the center line direction of the guide bearing mounting hole are respectively flush with the two side openings of the guide bearing mounting hole, the matching surface is extended parallel to the center line of the guide bearing mounting hole, and its two ends are respectively flush with the two side openings of the guide bearing mounting hole.

4. The guide bearing mounting bearing seat according to claim 2, characterized in that: The thickness of the root of the cantilever elastic piece is greater than the thickness of the end of the cantilever elastic piece.

5. A guide bearing elastic support structure for a high-temperature pump, comprising a bearing seat and a pump shaft, characterized in that: The bearing seat is a bearing seat for installing a guide bearing as described in any one of claims 1 to 4, a guide bearing is arranged concentrically in the guide bearing installation hole, the outer peripheral surface of the guide bearing is interference fit with the mating surface of each variable stiffness elastic unit, and positioning rings for limiting the movement of the guide bearing along the center line of the guide bearing are fixedly connected on the bearing seat body and at positions corresponding to the two ends of the guide bearing, the pump shaft passes through the guide bearing along the center line direction of the guide bearing, and a sleeve concentric with the pump shaft is mounted on the shaft body of the pump shaft at a position corresponding to the guide bearing, and there is a gap between the sleeve and the guide bearing.

6. The guide bearing elastic support structure for a high temperature pump according to claim 5, characterized in that: The two ends of the guide bearing along the center line direction thereof are respectively protruded outward to form positioning steps arranged on the same center line as the guide bearing, the material of the positioning ring is consistent with the material of the bearing seat body, the outer ring of the positioning ring is positioned with the bearing seat body through a stop, the inner ring of the positioning ring is protruded to form a ring edge which can extend into the inner side of the positioning step on the side thereof and is arranged on the same center line as the guide bearing mounting hole, and there is a gap between the ring edge and the inner side surface of the positioning step on the side thereof, and the size of the gap is: l 间隙 =(λ 定位环 -l 导轴承 )×D×(T-20) Where: 轴承座 is the thermal expansion coefficient of the bearing seat body material, λ 导轴承 is the thermal expansion coefficient of the guide bearing material, D is the nominal size of the locating ring and the guide bearing, and T is the temperature of the high-temperature medium.

7. The elastic support structure of the guide bearing for a high temperature pump according to claim 5, characterized in that: An expansion sleeve is arranged between the pump shaft and the sleeve, which is sleeved on the pump shaft and coaxial with the pump shaft. The material of the expansion sleeve is consistent with that of the pump shaft. Strip holes are evenly spaced on the sleeve body around the center line of the expansion sleeve. The strip holes extend in a direction parallel to the center line of the expansion sleeve. A support bar is formed between two adjacent strip holes. A boss for abutting against the inner wall of the sleeve is formed on the outer side surface of the support bar and located in the middle position of its length direction. The inner side surface of the support bar is a concave arcuate surface.

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