Horizontal single-stage centrifugal pump for high-temperature and high-pressure process conditions

Abstract

The present application relates to the technical field of centrifugal pump, particularly relates to a single-stage centrifugal pump for horizontal high-temperature and high-pressure process condition, comprising a pump shell, a pump shaft and a sealing assembly, a pump cavity is arranged in the pump shell, the pump shaft is rotatably arranged in the pump cavity, and the pump shaft can rotate around its axis, the sealing assembly comprises a fixed part, a sliding part and a sealing part, and the fixed part is arranged in the pump cavity, the fixed part, the sliding part and the sealing part are arranged, at least one sealing part is rotatably arranged on the fixed part or the sliding part, so when the sliding part is deflected, the two sealing parts are synchronously deflected with the sliding part or the sliding part is deflected relative to the two sealing parts, at this time, the two sealing parts can still keep coaxial, that is, the sealing surfaces of the two sealing parts face each other and still adhere to each other, so the two sealing parts are still uniformly stressed in the radial direction, so that the two sealing parts are not easy to form instantaneous eccentric wear, thereby reducing the wear and improving the service life of the sealing part.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and in particular to a horizontal single-stage centrifugal pump for high-temperature and high-pressure process conditions. Background Technology

[0002] A centrifugal pump is a fluid machinery device that uses the centrifugal force generated by the high-speed rotation of an impeller to transport liquids. It achieves the continuous transfer of liquids from low-pressure areas to high-pressure areas by converting mechanical energy into liquid kinetic energy and pressure energy.

[0003] The core structure of a centrifugal pump includes an impeller, pump casing, pump shaft, and sealing components. The impeller, the core component, is mounted on the pump shaft and transfers energy to the liquid. The pump casing supports the pump shaft, and the sealing components ensure a tight seal between the pump shaft and the pump casing during operation. In industries such as petrochemicals and metallurgy, centrifugal pumps often operate under high temperature and high pressure conditions. Under these conditions, turbulence and cavitation within the pump chamber are more likely to occur, leading to severe vibrations of the pump body and shaft. This causes radial runout of the pump shaft during rotation, and the originally safe clearance of the sealing components may disappear instantaneously at the peak of vibration, resulting in momentary uneven wear. Over time, this wear accumulates significantly, reducing the service life of the sealing components. Summary of the Invention

[0004] Therefore, it is necessary to provide a horizontal single-stage centrifugal pump for high-temperature and high-pressure processes to address the problems existing in current centrifugal pumps, in order to solve the problem that the sealing components of existing centrifugal pumps are prone to uneven wear under high-temperature and high-pressure conditions.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A horizontal single-stage centrifugal pump for high-temperature and high-pressure processes includes:

[0007] Pump casing, with a pump chamber inside;

[0008] The pump shaft is rotatably mounted inside the pump chamber and can rotate around its axis;

[0009] The sealing assembly includes a fixed part, a sliding part, and a sealing part. The fixed part is disposed inside the pump chamber, and the sliding part is coaxially and elastically disposed on the pump shaft. There are two sealing parts, which are respectively disposed on the fixed part and the sliding part, and at least one sealing part is rotatably disposed on the fixed part or the sliding part. The sealing surfaces of the two sealing parts face each other and can always fit together.

[0010] Preferably, the sealing assembly further includes an elastic element for resetting after driving the sealing part to rotate.

[0011] Preferably, of the two sealing parts, one sealing part is rotatably disposed on the fixed part, and the other sealing part is fixedly disposed on the sliding part.

[0012] Preferably, of the two sealing parts, one sealing part is rotatably disposed on the sliding part, and the other sealing part is fixedly disposed on the fixed part.

[0013] Preferably, of the two sealing parts, one sealing part is rotatably disposed on the fixed part, and the other sealing part is rotatably disposed on the sliding part.

[0014] Preferably, the sealing part includes a spherical ring, a rigid support ring, and a rubber sealing ring. The spherical ring has a spherical surface and an annular surface. The spherical surface of the spherical ring is rotatably mounted on the fixed part or the sliding part. There are multiple rigid support rings, which are nested sequentially from the inside to the outside along the radial direction of the spherical ring and are mounted on the annular surface of the spherical ring. There are multiple rubber sealing rings, which correspond one-to-one with the multiple rigid support rings and are mounted on the side of the rigid support ring away from the spherical ring. The multiple rubber sealing rings are arranged in a stepped pattern in the radial direction of the spherical ring.

[0015] Preferably, the rigid support ring is slidably disposed on the spherical ring, and an oil cavity is formed between the rigid support ring and the spherical ring, and two adjacent oil cavities in the radial direction of the spherical ring are interconnected.

[0016] Preferably, a horizontal single-stage centrifugal pump for high-temperature and high-pressure processes further includes a rotor and a bearing. The rotor is coaxially and fixedly connected to the pump shaft, and the outer side of the bearing is disposed on the pump casing, while the inner side is fixedly connected to the rotor.

[0017] Preferably, the bearing includes an outer ring, an inner ring, rolling elements, a cage, and guide plates. The outer ring and inner ring are coaxially rotatable, the cage is coaxially disposed between the outer ring and the inner ring, there are multiple rolling elements, which are spaced apart and rolled on the cage, and there are multiple guide plates, which are circumferentially equally spaced on the inner and outer sides of the cage, and the extension direction of the guide plates is inclined to the axis of the cage.

[0018] Preferably, the guide plates located on the inner and outer sides of the retainer are inclined in opposite directions.

[0019] The beneficial effects of this invention are:

[0020] The present invention comprises a fixed part, a sliding part, and a sealing part. Since at least one sealing part is rotatably mounted on the fixed part or the sliding part, when the sliding part is deflected, the two sealing parts will deflect synchronously with the sliding part or the sliding part will deflect relative to the two sealing parts simultaneously. At this time, the two sealing parts can still remain coaxial, that is, the sealing surfaces of the two sealing parts face each other and are still in contact with each other. Therefore, the two sealing parts are still subjected to uniform force in their radial direction, which makes it difficult for the two sealing parts to form instantaneous uneven wear. Therefore, it is beneficial to reduce the amount of wear and improve the service life of the sealing parts. Attached Figure Description

[0021] Figure 1 This is a quarter-sectional view of a horizontal single-stage centrifugal pump for high-temperature and high-pressure process conditions according to the present invention.

[0022] Figure 2 This is a half-sectional axial side view of the sealing assembly in a horizontal single-stage centrifugal pump operating under high temperature and high pressure conditions according to the present invention.

[0023] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point B in the middle;

[0024] Figure 4 This is a cross-sectional view of the sealing assembly in a horizontal single-stage centrifugal pump operating under high temperature and high pressure conditions according to the present invention.

[0025] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point A in the middle;

[0026] Figure 6 This is a half-section axial side view of the bearing in a horizontal single-stage centrifugal pump operating under high temperature and high pressure conditions according to the present invention.

[0027] Figure 7 This is an exploded view of the bearing in a horizontal single-stage centrifugal pump operating under high temperature and high pressure conditions according to the present invention.

[0028] in:

[0029] 100. Pump casing; 110. Pump chamber; 120. Fixture;

[0030] 200, Pump shaft; 210, First shaft sleeve; 220, Second shaft sleeve;

[0031] 310. Fixing part; 320. Sliding part; 330. Sealing part; 340. Compression spring;

[0032] 331. Elastic element; 332. Spherical ring; 333. Rigid support ring; 334. Rubber sealing ring; 335. Oil cavity; 336. Guide rod;

[0033] 400, Rotor;

[0034] 500, Bearing; 510, Outer ring; 520, Inner ring; 530, Rolling element; 540, Cage; 550, Deflector; 560, Side connecting ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] like Figures 1 to 7 As shown, a horizontal single-stage centrifugal pump for high-temperature and high-pressure processes includes a pump casing 100, a pump shaft 200, and a sealing assembly. The pump casing 100 has a pump chamber 110, and the pump shaft 200 is rotatably disposed in the pump chamber 110 and can rotate around its axis. The sealing assembly includes a fixed part 310, a sliding part 320, and a sealing part 330. The fixed part 310 is disposed in the pump chamber 110, and the sliding part 320 is coaxially and elastically disposed on the pump shaft 200. The sealing part 330 is annular, and there are two sealing parts 330. The two sealing parts 330 are respectively disposed on the fixed part 310 and the sliding part 320, and at least one sealing part 330 is rotatably disposed on the fixed part 310 or the sliding part 320. The sealing surfaces of the two sealing parts 330 face each other and can always be in contact with each other.

[0039] In the prior art, both sealing parts 330 are fixedly mounted on the fixed part 310 and the sliding part 320. During normal rotation of the pump shaft 200, the two sealing parts 330 are coaxial and fit together to achieve a seal. When turbulence or cavitation occurs inside the pump chamber 110, the pump shaft 200 is subjected to force and vibrates violently. At this time, the pump shaft 200 generates radial runout during rotation, that is, the axis of the pump shaft 200 is slightly deviated from the axis of rotation of the pump chamber 110. Since the sliding part 320 is coaxially and elastically mounted on the pump shaft 200, the sliding part 320 deviates slightly synchronously with the pump shaft 200. Because the sealing part 330 is fixedly mounted on the sliding part... On 320, the sliding part 320 drives the sealing part 330 fixedly connected to it to tilt synchronously. Since the other sealing part 330 is fixedly set on the fixed part 310, and the fixed part 310 is fixedly set in the pump cavity 110, the two sealing parts 330 are no longer coaxial. The axes of the two sealing parts 330 are at an angle, and the sealing surfaces of the two sealing parts 330 no longer fit together. Therefore, the two sealing parts 330 are no longer subjected to uneven forces in their radial direction, that is, the two sealing parts 330 form instantaneous uneven wear. After long-term accumulation, the wear of the two sealing parts 330 will increase significantly, resulting in a reduction in the service life of the two sealing parts 330.

[0040] In this invention, when turbulence or cavitation occurs in the pump chamber 110, the pump shaft 200 is subjected to force and vibrates violently. At this time, the pump shaft 200 generates radial runout during rotation, that is, the axis of the pump shaft 200 is deviated from the rotation axis of the pump chamber 110. Since the sliding part 320 is elastically disposed on the pump shaft 200, the pump shaft 200 drives the sliding part 320 to deviate synchronously. Since at least one sealing part 330 is rotatably disposed on the fixed part 310 or the sliding part 320, when the sliding part 320 deviates, the two sealing parts 330 will deviate synchronously with the sliding part 320 or the sliding part 320 will deviate relative to the two sealing parts 330 at the same time. At this time, the two sealing parts 330 can still remain coaxial, that is, the sealing surfaces of the two sealing parts 330 face each other and are still in contact with each other. Therefore, the two sealing parts 330 are still subjected to uniform force in their radial direction, which makes it difficult for the two sealing parts 330 to form instantaneous uneven wear, thus helping to reduce the amount of wear and improve the service life of the sealing parts 330.

[0041] It should be added that, as Figures 1-5As shown, to install the fixing part 310 inside the pump chamber 110, specifically, a fixing member 120 is provided on the cavity wall of the pump chamber 110. The fixing member 120 is frustoconical, and the axis of the fixing member 120 coincides with the axis of the pump chamber 110. The fixing part 310 is fixedly disposed inside the fixing member 120. To elastically dispose of the sliding part 320 on the pump shaft 200, specifically, a first bushing 210 and a second bushing 220 are sequentially sealed on the pump shaft 200 from left to right. The sliding part 320 is coaxially elastically disposed outside the first bushing 210 through a compression spring 340.

[0042] In a further embodiment, the sealing assembly further includes an elastic element 331, which is used to drive the sealing part 330 to rotate and then reset. Specifically, the elastic element 331 is an irregularly shaped elastic metal ring, which includes a spherical elastic metal ring and two U-shaped elastic metal rings. The spherical elastic metal ring is disposed on the end face of the two sealing parts 330 facing away from each other. The two U-shaped elastic metal rings are respectively disposed at both ends of the spherical elastic metal ring. The end of the outer elastic metal ring away from the spherical elastic metal ring is disposed on the end face of the sliding part 320 or the fixed part 310, and the end of the inner elastic metal ring away from the spherical elastic metal ring is disposed on the inner peripheral wall of the sliding part 320 or the fixed part 310. Taking the sealing part 330 rotatably disposed on the sliding part 320 as an example, when the sealing part 330 rotates relative to the sliding part 320, the two U-shaped cross-section elastic metal rings are deformed by force. When the turbulence or cavitation phenomenon in the pump chamber 110 disappears, the two U-shaped cross-section elastic metal rings push the sealing part 330 to rotate in the opposite direction relative to the sliding part 320 under their own elastic force, so that the sealing part 330 is reset to the initial state.

[0043] Furthermore, in order to provide rotational support for the sealing part 330, an arc-shaped rib can be provided on the elastic member 331, and an arc-shaped guide groove can be provided on the corresponding fixed part 310 or sliding part 320, so that the arc-shaped rib can be slidably disposed in the arc-shaped guide groove.

[0044] In a further embodiment, of the two sealing portions 330, one sealing portion 330 is rotatably disposed on the fixed portion 310, and the other sealing portion 330 is fixedly disposed on the sliding portion 320. It should be added that, in this embodiment, there is only one elastic element 331, which is connected between the fixed portion 310 and the corresponding sealing portion 330, and is used to reset the sealing portion 330 after it rotates relative to the fixed portion 310.

[0045] When the sliding part 320 is tilted, since the sealing part 330 on it is fixedly installed, the sliding part 320 drives the sealing part 330 to tilt synchronously. Since the sealing surfaces of the two sealing parts 330 are in contact with each other, and the other sealing part 330 is rotatably installed on the fixed part 310, when the sealing part 330 fixedly installed on the sliding part 320 tilts synchronously with the sliding part 320, the sealing part 330 drives the other sealing part 330 to tilt synchronously through its sealing surface. At this time, the other sealing part 330 rotates relative to the fixed part 310. At this time, the elastic element 331 gradually receives force and produces elastic deformation. Since the sealing surfaces of the two sealing parts 330 still remain in contact with each other during this process, the two sealing parts 330 are still subjected to uniform force in their radial direction. That is, the two sealing parts 330 are not prone to instantaneous uneven wear, which helps to reduce wear and improve the service life of the sealing part 330.

[0046] When the turbulence or cavitation phenomenon in the pump chamber 110 disappears, the elastic element 331 pushes the sealing part 330 to rotate in the opposite direction relative to the fixed part 310 under its own elastic force, so that the sealing part 330 is reset to the initial state.

[0047] In another embodiment, of the two sealing portions 330, one sealing portion 330 is rotatably disposed on the sliding portion 320, and the other sealing portion 330 is fixedly disposed on the fixing portion 310. It should be added that in this embodiment, there is only one elastic member 331, which is connected between the sliding portion 320 and the sealing portion 330, and is used to reset the sealing portion 330 after it rotates relative to the sliding portion 320.

[0048] When the sliding part 320 is tilted, since the sealing part 330 on it is rotatably mounted, while the other sealing part 330 that is in contact with the sealing part 330 is fixedly mounted on the fixed part 310, when the sliding part 320 is tilted, the rotatably mounted sealing part 330 will not tilt synchronously with the sliding part 320. Therefore, the sealing surfaces of the two sealing parts 330 remain in contact with each other, so that the two sealing parts 330 are still subjected to uniform force in their radial direction. That is, the two sealing parts 330 will not form instantaneous uneven wear, which helps to reduce the amount of wear and improve the service life of the sealing part 330.

[0049] In another embodiment, of the two sealing portions 330, one sealing portion 330 is rotatably disposed on the fixed portion 310, and the other sealing portion 330 is rotatably disposed on the sliding portion 320. It should be added that, in this embodiment, there are two elastic members 331, one elastic member 331 is connected between the fixed portion 310 and the corresponding sealing portion 330, and the other elastic member 331 is connected between the sliding portion 320 and the corresponding sealing portion 330.

[0050] When the sliding part 320 is tilted, since the sealing part 330 on it is rotatably configured, and the sealing part 330 on the fixed part 310 is also rotatably configured, the sliding part 320 rotates relative to the rotatably configured sealing part 330, and the fixed part 310 rotates relative to the rotatably configured sealing part 330. During this process, since the sealing surfaces of the two sealing parts 330 still remain in contact with each other, the two sealing parts 330 are still subjected to uniform force in their radial direction. That is, the two sealing parts 330 will not form instantaneous uneven wear, which is beneficial to reduce the amount of wear and improve the service life of the sealing part 330.

[0051] It is understandable that, compared to the sealing part 330 being rotatably mounted on the sliding part 320 or the fixed part 310, so that the two sealing parts 330 are rotatably mounted on the fixed part 310 and the sliding part 320 respectively, the angle of rotation of the sealing part 330 relative to the fixed part 310 and the sliding part 320 can be increased, thus adapting to working conditions with more severe vibration intensity.

[0052] It is understandable that when the pump shaft 200 moves radially, the sealing surfaces of the two sealing parts 330 in the prior art will misalign with each other. At this time, a local linear velocity difference is generated between the two sealing parts 330, that is, the two sealing parts 330 rotate relative to each other locally, which will cause local uneven wear of the two sealing parts 330. To solve this problem, in a further embodiment, such as Figures 1-5 As shown, the sealing part 330 includes a spherical ring 332, a rigid support ring 333, and a rubber sealing ring 334. The spherical ring 332 has a spherical surface and an annular surface. The spherical surface of the spherical ring 332 is rotatably mounted on the fixed part 310 or the sliding part 320. There are multiple rigid support rings 333, which are nested sequentially from the inside to the outside along the radial direction of the spherical ring 332 and are disposed on the annular surface of the spherical ring 332. There are multiple rubber sealing rings 334. Each of the multiple rigid support rings 333 corresponds to one of the multiple rigid support rings 333 and is located on the side of the rigid support ring 333 away from the spherical ring 332. The multiple rubber sealing rings 334 are arranged in a stepped manner in the radial direction of the spherical ring 332. The stepped arrangement of the multiple rubber sealing rings 334 corresponding to the fixed part 310 and the multiple rubber sealing rings 334 corresponding to the sliding part 320 is opposite in direction. This makes two rubber sealing rings 334 at the same position in the radial direction of the spherical ring 332 fit together.

[0053] When the pump shaft 200 is subjected to radial force, the multiple rubber sealing rings 334 are arranged in a stepped manner on the radial side of the spherical ring 332. Therefore, the rubber sealing rings 334 corresponding to the two sealing parts 330 cooperate and restrict each other, so that the rubber sealing rings 334 cannot slide relative to each other on the radial side of the spherical ring 332. In this way, the linear velocity of the two rubber sealing rings 334 that are in contact with each other can always be kept consistent, thereby avoiding the difference in linear velocity caused by the two rubber sealing rings 334 that are in contact with each other due to local misalignment, that is, avoiding the problem of local uneven wear of the two rubber sealing rings 334 that are in contact with each other.

[0054] It is understandable that when the pump shaft 200 is misaligned, although the multiple rubber sealing rings 334 still remain in contact with each other, the normal pressure between the two outermost rubber sealing rings 334 in the radial direction of the spherical ring 332 is greater, while the normal pressure between the two innermost rubber sealing rings 334 in the radial direction of the spherical ring 332 is greater. Therefore, the wear of the two outermost rubber sealing rings 334 will still be greater than that of the two innermost rubber sealing rings 334. To solve this problem, in a further embodiment, such as... Figures 1-5 As shown, the rigid support ring 333 is slidably disposed on the spherical ring 332, and an oil cavity 335 is formed between the rigid support ring 333 and the spherical ring 332, and two adjacent oil cavities 335 in the radial direction of the spherical ring 332 are interconnected.

[0055] Since the two adjacent oil chambers 335 in the radial direction of the spherical ring 332 are interconnected, when the positive pressure between the two outermost rubber sealing rings 334 is large, the rigid support rings 333 corresponding to the two outermost rubber sealing rings 334 will slide to one side along the cavity wall of the oil chamber 335. At this time, the hydraulic oil will flow between the two adjacent oil chambers 335 in the radial direction of the spherical ring 332 until the pushing force between the two rubber sealing rings 334 arranged radially along the spherical ring 332 and abutting each other is the same. This can prevent uneven wear and improve the service life of the sealing part 330.

[0056] Furthermore, in order to guide the movement of the rigid support ring 333, a guide hole is provided on the annular end face of the spherical ring 332, and a guide rod 336 is provided at the end of the rigid support ring 333 away from the rubber sealing ring 334. The guide rod 336 is slidably connected in the guide hole.

[0057] In a further embodiment, such as Figures 6-7 As shown, the horizontal high temperature and high pressure process single-stage centrifugal pump also includes a rotor 400 and a bearing 500. The rotor 400 is coaxially and fixedly connected to the pump shaft 200. The outer side of the bearing 500 is set on the pump casing 100, and the inner side is fixedly connected to the rotor 400.

[0058] After the single-stage centrifugal pump is started, the rotor 400 drives the pump shaft 200 to rotate, and the bearing 500 is set to support the rotation of the rotor 400.

[0059] In a further embodiment, such as Figures 6-7 As shown, the bearing 500 includes an outer ring 510, an inner ring 520, rolling elements 530, a cage 540, and guide plates 550. The outer ring 510 and the inner ring 520 are coaxially rotatably configured. The outer ring 510 is also provided with side connecting rings 560 at both ends, which are used to form an annular oil cavity that can accommodate lubricating oil through the outer ring 510, the inner ring 520, and the two side connecting rings 560. The cage 540 is coaxially disposed between the outer ring 510 and the inner ring 520. Specifically, the cage 540 is coaxially placed in the annular oil cavity and is rotatably connected to both the outer ring 510 and the inner ring 520. There are multiple rolling elements 530, which are spaced apart and rotatably disposed on the cage 540. There are multiple guide plates 550, which are circumferentially and equally spaced on the inner and outer sides of the cage 540, and the extension direction of the guide plates 550 is inclined to the axis of the cage 540.

[0060] Since the extension direction of the guide plate 550 is inclined to the axis of the cage 540, the lubricating oil can flow along the axis of the cage 540 under the guiding action of the guide plate 550, so as to increase the uniformity of the distribution of the lubricating oil in the axial direction of the cage 540, so that a stable and uniform oil film is formed in the annular oil cavity, thereby increasing the time that the oil film stays on the surface of the rolling element 530 and reducing the wear of the rolling element 530, the outer ring 510 and the inner ring 520.

[0061] In a further embodiment, the guide plates 550 located on the inner and outer sides of the retainer 540 are tilted in opposite directions.

[0062] By making the inclination directions of the guide plates 550 on the inner and outer sides of the retainer 540 opposite, it is beneficial to promote the circulation of lubricating oil on the inner and outer sides of the annular oil chamber, making the distribution of lubricating oil more uniform and effectively reducing the damage caused by the axial and radial runout of the pump shaft 200.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A single stage centrifugal pump for horizontal high temperature and high pressure process services, characterized in that, The utility model relates to a pump, comprising: a pump shell having a pump cavity; a pump shaft rotatably arranged in the pump cavity and capable of rotating about its axis; a sealing assembly comprising a fixed part, a sliding part and two sealing parts, the fixed part being arranged in the pump cavity, the sliding part being coaxially and elastically arranged on the pump shaft, the two sealing parts being arranged on the fixed part and the sliding part respectively, at least one of the two sealing parts being rotatably arranged on the fixed part or the sliding part, the sealing surfaces of the two sealing parts facing each other and capable of always abutting each other; the sealing part comprises a spherical ring, a plurality of rigid support rings and a plurality of rubber sealing rings, the spherical ring having a spherical surface and a circular surface, the spherical surface of the spherical ring being rotatably arranged on the fixed part or the sliding part, the plurality of rigid support rings being nested in the radial direction of the spherical ring from inside to outside in sequence and arranged on the circular surface of the spherical ring, the plurality of rubber sealing rings corresponding to the plurality of rigid support rings one by one and arranged on the side of the rigid support rings away from the spherical ring, and the plurality of rubber sealing rings being arranged in a stepped shape in the radial direction of the spherical ring; the rigid support rings are slidably arranged on the spherical ring, and an oil cavity is formed between the rigid support rings and the spherical ring, and the two adjacent oil cavities in the radial direction of the spherical ring are in communication with each other; a guide hole is formed on the annular end surface of the spherical ring, and a guide rod is arranged on the end of the rigid support ring away from the rubber sealing ring, the guide rod being slidably connected in the guide hole; the sealing assembly further comprises an elastic member for driving the sealing part to return after rotation.

2. A single stage centrifugal pump for horizontal high temperature and high pressure process services as claimed in claim 1, wherein In the two sealing parts, one of the sealing parts is rotatably arranged on the sliding part, and the other sealing part is fixedly arranged on the fixed part.

3. A single stage centrifugal pump for horizontal high temperature and high pressure process services as claimed in claim 1, wherein The utility model further comprises a rotor and a bearing, the rotor being coaxially and fixedly connected with the pump shaft, the outer side of the bearing being arranged on the pump shell, and the inner side of the bearing being fixedly connected with the rotor.

4. A single stage centrifugal pump for high temperature and high pressure process conditions, of horizontal type according to claim 3, characterized in that, The bearing comprises an outer ring, an inner ring, a plurality of rolling bodies, a retainer and a plurality of guide plates, the outer ring and the inner ring being coaxially and rotatably arranged, the retainer being coaxially arranged between the outer ring and the inner ring, the plurality of rolling bodies being spaced and rotatably arranged on the retainer, the plurality of guide plates being circumferentially and equidistantly arranged on the inner side and the outer side of the retainer, and the extension direction of the guide plates being inclined to the axis of the retainer.

5. A single stage centrifugal pump for horizontal high temperature and high pressure process services as claimed in claim 4 wherein, The inclined directions of the guide plates arranged on the inner side and the outer side of the retainer are opposite.

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