CN214837399U

CN214837399U - Damping device of vertical centrifugal pump for natural gas production

Info

Publication number: CN214837399U
Application number: CN202023188222.0U
Authority: CN
Inventors: 孙忠洋; 欧昌隆; 吕大垚; 王腾
Original assignee: China Natural Gas Guangyuan Co ltd
Current assignee: China Natural Gas Guangyuan Co ltd
Priority date: 2020-12-26
Filing date: 2020-12-26
Publication date: 2021-11-23
Anticipated expiration: 2030-12-26

Abstract

The utility model provides a damping device of a vertical centrifugal pump for natural gas production, which comprises a motor, a pump body, a pump shaft and an outer cylinder, wherein the output shaft of the motor is connected with the pump shaft through a coupling, and the pump shaft is hermetically connected with the upper part of the pump body; the pump body, the pump shaft and the coupling are arranged in the outer cylinder; the lower part of the outer cylinder is arranged under the ground, and the upper part of the outer cylinder is connected with the base; a first hoop supporting seat is arranged outside the connecting part of the outer barrel and the base, and a first wear-resistant rubber pad is arranged between the first hoop supporting seat and the connecting part; the periphery of the upper part of the motor is provided with a second hoop supporting seat, and a second wear-resistant rubber pad is arranged between the second hoop supporting seat and the motor; the first hoop supporting seat and the second hoop supporting seat are connected with the pre-buried damping base plate through the connecting screw, the connecting screw is sleeved with the damping spring, and two ends of the damping spring are abutted to the damping base plate and the first hoop supporting seat/the second hoop supporting seat. The device plays fixed, the cushioning effect, can effectively slow down, eliminate the vibrations that produce among the operation process, reduces mechanical seal's among the vertical centrifugal pump wearing and tearing, noise reduction, increase of service life.

Description

Damping device of vertical centrifugal pump for natural gas production

Technical Field

The utility model relates to a natural gas production processing equipment technical field, concretely relates to damping device of vertical centrifugal pump for natural gas production.

Background

In the process of producing Liquefied Natural Gas (LNG), the process of compressing natural gas, cooling the natural gas to a temperature below the boiling point of the natural gas (161.5 ℃) so as to convert gasified natural gas into liquefied natural gas is involved. In the liquefaction operation system, the system also relates to a refrigerant circulating system, wherein the refrigerant circulating system refers to that gas-phase mixed refrigerant flowing out of the cold box enters an interstage cooler for cooling after being subjected to one-stage compression and pressurization by a refrigerant compressor, and then enters an interstage separation tank for gas-liquid separation. The separated gas-phase mixed refrigerant enters a secondary inlet of the compressor to be compressed and pressurized in a secondary mode, the separated liquid-phase mixed refrigerant is conveyed to a secondary outlet of the refrigerant compressor through the interstage refrigerant pump, and is mixed with the gas-phase mixed refrigerant at the secondary outlet of the refrigerant compressor and then enters an outlet cooler of the refrigerant compressor to be cooled. And after cooling, the mixed refrigerant enters a refrigerant compressor outlet separation tank for gas-liquid separation, and the separated liquid-phase mixed refrigerant is conveyed to a cold box refrigerant flow passage through a refrigerant pump.

In the current LNG production plant, the inter-stage refrigerant pump and the refrigerant pump in the refrigerant circulation system are both vertical multistage centrifugal pumps, the motor pump length can reach 6 meters, the pump shaft diameter is small, and the pump impeller is placed in a pump pool about 4 meters deep below the ground. Because the centrifugal pump has a long structure, poor rigidity and large pressure ratio and flow rate of the pump, large vibration is usually generated in the generation process, so that the abrasion of a mechanical seal is accelerated. When the mechanical seal is seriously worn after long-term operation, the refrigerant is easy to leak, and the risk of fire and explosion exists. And the mechanical seal quality requirement of the pump is high, and once the pump is damaged, the replacement and maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

To the technical problem, the utility model aims at providing a damping device of vertical centrifugal pump for natural gas production, the device sets up matched with staple bolt supporting seat and wear-resisting rubber pad at motor and urceolus connecting portion to at the pre-buried shock attenuation base plate in ground, connect shock attenuation base plate and staple bolt supporting seat through connecting screw, play fixed and absorbing effect, can effectively alleviate and eliminate the vibrations that produce in the operation process, mechanical seal's wearing and tearing in the reduction vertical centrifugal pump, the noise reduction, increase of service life.

In order to achieve the above object, the utility model adopts the following technical scheme:

the damping device of the vertical centrifugal pump for natural gas production comprises a motor, a pump body, a pump shaft and an outer cylinder, wherein an output shaft of the motor is downwards connected with the pump shaft through a coupling, and the pump shaft is hermetically connected with the upper part of the pump body; the pump body, the pump shaft and the coupling are arranged in the outer cylinder; the lower part of the outer cylinder is fixedly arranged below the ground, and the upper part of the outer cylinder is connected with a base of the motor; a first hoop supporting seat matched with the outer cylinder is arranged on the periphery of the connecting part of the outer cylinder and the base, and a first wear-resistant rubber pad is arranged between the first hoop supporting seat and the periphery of the connecting part; a second hoop supporting seat matched with the motor is arranged on the periphery of the upper part of the motor, and a second wear-resistant rubber pad is arranged between the second hoop supporting seat and the motor; the ground is pre-buried with the shock attenuation base plate, first staple bolt supporting seat and second staple bolt supporting seat all through connecting screw with the shock attenuation base plate is connected, the last cover of connecting screw is equipped with damping spring, damping spring both ends and shock attenuation base plate and first staple bolt supporting seat, shock attenuation base plate and second staple bolt supporting seat butt.

Optionally, an end cap is arranged at the lower end of the connecting screw rod, the upper end of the connecting screw rod is connected with a nut, and first damping rubber gaskets are arranged between the end cap and the damping substrate and between the nut and the first hoop supporting seat or the second hoop supporting seat.

Optionally, a strip-shaped mounting hole is formed in the damping substrate, one end of the strip-shaped mounting hole is large in size and is matched with the end cap, and the other end of the strip-shaped mounting hole is small in size and is matched with the rod part of the connecting screw rod; the end cap of the connecting screw penetrates from one end of the strip-shaped mounting hole and is limited in the other end.

Optionally, the periphery of the shock absorption substrate extends downwards to form an embedded part, and the embedded part is bent outwards; the inside bar mounting hole that corresponds of shock-absorbing substrate's downside is equipped with a mounting groove, the mounting groove supplies connecting screw's end cap to penetrate the installation.

Optionally, the damping spring is a compression spring, and second damping rubber gaskets are arranged between the damping spring and the damping substrate, the first hoop supporting seat and the second hoop supporting seat.

Optionally, the first hoop support seat comprises two first semicircular hoop members, and the two first semicircular hoop members are connected through a bolt; a first groove is formed in the inner side of the first semicircular hoop part along the circumferential direction, the first wear-resistant rubber gasket is arranged in the first groove, and the thickness of the first wear-resistant rubber gasket is smaller than the depth of the first groove; the upper surface and the lower surface of the first groove are respectively matched with the base and the outer barrel.

Optionally, the second hoop support seat comprises two second semicircular hoop members, and the two second semicircular hoop members are connected through bolts; the inner side of the second semicircular hoop part is provided with a second groove along the circumferential direction, the second wear-resistant rubber pad is arranged in the second groove, and the thickness of the second wear-resistant rubber pad is larger than the depth of the second groove.

Compared with the prior art, the beneficial effects of the utility model are that:

the damping device of the utility model is provided with a first hoop supporting seat, a second hoop supporting seat, a wear-resistant rubber pad, a damping base plate, a connecting screw rod and a damping spring; wherein, first staple bolt supporting seat cooperatees with the connection site of urceolus and base, and second staple bolt supporting seat is connected with motor upper portion, is connected with damping substrate through connecting screw and damping spring again, plays the effect of stabilizing motor and urceolus, reduces vibrations and the noise that the operation in-process produced, and the effort that simultaneously can effective absorption, eliminate vibrations and produce slows down the wearing and tearing at mechanical seal position in the vertical centrifugal pump, prolongs its life, reduction in production cost.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of a portion a in fig. 1.

Fig. 3 is a schematic top view of the shock-absorbing base plate of the present invention.

Fig. 4 is a schematic bottom view of the shock-absorbing base plate of the present invention.

Fig. 5 is a schematic view of the overlooking structure of the first hoop supporting seat of the present invention.

Fig. 6 is a schematic sectional view in the direction B-B in fig. 5.

Fig. 7 is a schematic view of the overlooking structure of the second hoop supporting seat of the present invention.

Fig. 8 is a schematic sectional view in the direction of C-C in fig. 7.

Reference numerals:

1: a motor; 11: a base; 2: an outer cylinder; 21: a pump body; 22: a pump shaft; 3: a first hoop supporting seat; 31: a first wear-resistant rubber pad; 32: a first semi-circular hoop; 321: a first groove; 4: a second hoop supporting seat; 41: a second wear-resistant rubber pad; 42: a second semi-circular hoop; 421: a second groove; 5: a shock-absorbing base plate; 51. a strip-shaped mounting hole; 52. an embedding part; 53. mounting grooves; 6. connecting a screw rod; 61. an end cap; 62. a nut; 63. a first cushion rubber washer; 7. a damping spring; 71. a second cushion rubber gasket; 8. a bottom surface.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings, or are orientations and positional relationships conventionally understood by those skilled in the art, which are merely for convenience of description and simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the embodiment of the utility model provides a damping device of vertical centrifugal pump for natural gas production, including motor 1, the pump body 21, pump shaft 22, urceolus 2, first staple bolt supporting seat 3, second staple bolt supporting seat 4, shock attenuation base plate 5, connecting screw 6 and damping spring 7 etc..

Wherein, the motor 1 is positioned at the uppermost part, and the output shaft thereof is downwards connected with the pump shaft 22 through a coupling; the pump shaft 22 is provided with an impeller and extends into the pump body 21, and the pump shaft 22 is in mechanical seal connection with the upper part of the pump body 21. The pump body 21, pump shaft 22, impeller and coupling are all located within the outer barrel 2. The lower part of the outer cylinder 2 is fixedly arranged below the ground 8, and the upper part of the outer cylinder 2 is connected with a base 11 of the motor 1.

The connection position periphery of urceolus 2 and motor 1 base 11 is provided with the first staple bolt supporting seat 3 of matched with, and first wear-resisting rubber pad 31 is installed to the inboard of first staple bolt supporting seat 3, and first wear-resisting rubber pad 31 is located between first staple bolt supporting seat 3 and the connection position promptly, plays the effect of buffering and abrasionproof damage. The upper portion periphery of motor 1 is provided with matched with second staple bolt supporting seat 4, and the second wear-resisting rubber 41 of looks adaptation is installed to 4 inboard sides of second staple bolt supporting seat, and second wear-resisting rubber pad 41 is located between 1 shells of second staple bolt supporting seat 4 and motor promptly, plays the effect of buffering and abrasionproof damage.

The ground 8 is pre-buried through concrete placement has damping substrate 5, and first staple bolt supporting seat 3 and second staple bolt supporting seat 4 are all connected with damping substrate 5 through connecting screw 6, and the cover is equipped with damping spring 7 on the connecting screw 6. Wherein, damping spring 7's both ends and damping substrate 5 and the 3 butts of first staple bolt supporting seat, perhaps with damping substrate 5 and the 4 butts of second staple bolt supporting seat, play and stabilize first staple bolt supporting seat 3, the effect of second staple bolt supporting seat 4 and vertical centrifugal pump.

As shown in fig. 1 and 2, the lower end of the connecting screw rod 6 is provided with an end cap 61, and the upper end is provided with a thread part to be connected with a nut 62; the end cap 61 is positioned at the lower side of the damping substrate 5, and a first damping rubber gasket 63 is arranged between the end cap 61 and the damping substrate 5; the nut 62 is located on the upper side of the first hoop support seat 3 or the second hoop support seat 4, and a first damping rubber gasket 63 is also arranged between the nut 62 and the first hoop support seat 3 or the second hoop support seat 4. The upper and lower connecting parts are all provided with a first damping rubber gasket 3 for damping and preventing abrasion.

In one embodiment, as shown in fig. 3, a strip-shaped mounting hole 51 is formed in the damper base plate 5, one end of the strip-shaped mounting hole 51 is larger in size to fit with an end cap 61, and the end cap 61 can penetrate through the damper base plate 5 from the larger-sized end of the strip-shaped mounting hole 51; the other end of the strip-shaped mounting hole 51 is smaller in size and is adapted to the rod part of the connecting screw 6. When the connecting screw rod 6 is installed, the end cap 61 of the connecting screw rod 6 penetrates through one large-size end of the strip-shaped mounting hole 51 and is limited in the other end. The damping base plate 5 is provided with the strip-shaped mounting hole 51, so that the connecting screw rod 6 can be conveniently mounted, dismounted, maintained and replaced.

As shown in fig. 2 to 4, the periphery of the damper base plate 5 is provided with an embedded portion 52 extending downward, and the embedded portion 52 is bent outward, so that when the damper base plate 5 is embedded and installed, the embedded portion 52 is located in the concrete floor 8, thereby increasing the embedding stability of the damper base plate 5. The inside bar mounting hole 51 that corresponds of the downside of vibration damping substrate 5 is equipped with mounting groove 53, and this mounting groove 53 only is in bar mounting hole 51 department opening, and the lower part is sealed, can not get into the concrete in the mounting groove 53 when pre-buried. The mounting groove 53 is used for the end cap 61 of the connecting screw 6 to penetrate and mount, and is a space for accommodating the end cap 61 and a running space of the end cap 61 when the connecting screw 6 is mounted; after the damping base plate 5 is embedded, the connecting screw 6 can be smoothly installed and detached.

As shown in fig. 1 and 2, the damping spring 7 is a compression spring, sleeved on the connecting screw rod 6, and located between the damping substrate 5 and the first hoop support seat 3 or the second hoop support seat 4. A second damping rubber gasket 71 is arranged between the lower end of the damping spring 7 and the damping base plate 5, and a second damping rubber gasket 71 is also arranged between the upper end of the damping spring 7 and the first hoop support seat 3 or the second hoop support seat 4. The damping spring 7 and the second damping rubber washer 71 are arranged to play a role in damping and absorbing vibration, so that noise and abrasion generated in the operation process can be effectively reduced.

As shown in fig. 5 and 6, the first hoop support base 3 includes two first semicircular hoop members 32 correspondingly engaged with each other, and the two first semicircular hoop members 32 are fastened and connected by bolts and sleeved outside the connection portion between the outer cylinder 2 and the base 11 of the motor 1. The first semi-circular hoop member 32 is provided with a first groove 321 along the circumferential direction, the first groove 321 is matched with the first abrasion-resistant rubber pad 31, and the first abrasion-resistant rubber pad 31 is installed and limited in the first groove 321. The thickness of the first hard-wearing rubber pad 31 is smaller than the depth of the first groove 321. When assembled, the first abrasion-resistant rubber pad 31 is completely accommodated in the first groove 321; the upper and lower surfaces of the first groove 321 are respectively matched with the edges of the base 11 of the motor 1 and the outer cylinder 2, that is, the outer edge of the connecting part of the outer cylinder 2 and the base 11 of the motor 1 extends into the first groove 321 to contact with the upper and lower surfaces of the first abrasion-resistant rubber pad 31 and the first groove 321. The first groove 321 plays a role in limiting and fixing the first wear-resistant rubber pad 41 and the connecting part of the limiting base 11 and the outer cylinder 2.

As shown in fig. 7 and 8, the second hoop support seat 4 includes two second semicircular hoop members 42 correspondingly engaged with each other, and the two second semicircular hoop members 42 are fastened and connected by bolts and sleeved on the outer periphery of the upper portion of the motor 1. The inner side of the second semicircular hoop member 42 is provided with a second groove 421 along the circumferential direction, the second groove 421 is matched with the second abrasion-resistant rubber pad 41, and the thickness of the second abrasion-resistant rubber pad 41 is greater than the depth of the second groove 421, that is, when the second abrasion-resistant rubber pad 41 is installed in the second groove 421, a part of the second abrasion-resistant rubber pad protrudes out of the second groove 421 and contacts with the periphery of the motor. The second groove 421 has the function of limiting and fixing the second abrasion-resistant rubber pad 421, so as to prevent the second abrasion-resistant rubber pad 41 from slipping off.

The connecting screw rods 6 are uniformly distributed along the circumference and connected with the first hoop supporting seat 3 or the second hoop supporting seat 4. Preferably, the connecting screw rods 6 connected with the first hoop supporting seat 3 or the second hoop supporting seat 4 comprise at least 3 connecting screw rods, so that the first hoop supporting seat 3 and the second hoop supporting seat 4 are stressed stably, and vibration or shock absorption is stable.

To sum up, the damping device of the utility model is provided with a first hoop supporting seat 3, a second hoop supporting seat 4, a first wear-resistant rubber pad 31, a second wear-resistant rubber pad 41, a damping base plate 5, a connecting screw rod 6 and a damping spring 7; wherein, first staple bolt supporting seat 3 cooperates with the connecting portion phase of urceolus 2 and base 11, and second staple bolt supporting seat 4 is connected with 1 upper portion of motor, is connected with damping substrate 5 through connecting screw 6 and damping spring 7 again, plays the effect of stabilizing motor 1 and urceolus 2, reduces vibrations and the noise that the operation in-process produced, but the effort that vibrations produced simultaneously effective absorption, elimination vibrations produced slows down the wearing and tearing at mechanical seal position in the vertical centrifugal pump, prolongs its life, reduction in production cost.

Claims

1. The damping device of the vertical centrifugal pump for natural gas production comprises a motor (1), a pump body (21), a pump shaft (22) and an outer cylinder (2), and is characterized in that an output shaft of the motor (1) is downwards connected with the pump shaft (22) through a coupling, and the pump shaft (22) is hermetically connected with the upper part of the pump body (21); the pump body (21), the pump shaft (22) and the coupling are arranged in the outer cylinder (2); the lower part of the outer cylinder (2) is fixedly arranged below the ground (8), and the upper part of the outer cylinder (2) is connected with a base (11) of the motor (1); a first hoop supporting seat (3) matched with the outer barrel (2) is arranged on the periphery of the connecting part of the outer barrel and the base (11), and a first wear-resistant rubber pad (31) is arranged between the first hoop supporting seat (3) and the periphery of the connecting part; a second hoop supporting seat (4) matched with the motor (1) is arranged on the periphery of the upper part of the motor (1), and a second wear-resistant rubber pad (41) is arranged between the second hoop supporting seat (4) and the motor (1); the damping base plate (5) is pre-buried on the ground (8), the first hoop supporting seat (3) and the second hoop supporting seat (4) are connected with the damping base plate (5) through the connecting screw (6), the damping spring (7) is sleeved on the connecting screw (6), and two ends of the damping spring (7) are abutted to the damping base plate (5) and the first hoop supporting seat (3), the damping base plate (5) and the second hoop supporting seat (4).

2. The damping device of the vertical centrifugal pump for natural gas production according to claim 1, wherein the connecting screw rod (6) is provided with an end cap (61) at the lower end and a nut (62) at the upper end, and first damping rubber gaskets (63) are arranged between the end cap (61) and the damping base plate (5) and between the nut (62) and the first hoop support base (3) or the second hoop support base (4).

3. The damping device of the vertical centrifugal pump for natural gas production as claimed in claim 2, wherein the damping base plate (5) is provided with a strip-shaped mounting hole (51), one end of the strip-shaped mounting hole (51) is large in size and is adapted to the end cap (61), and the other end of the strip-shaped mounting hole is small in size and is adapted to the rod part of the connecting screw rod (6); an end cap (61) of the connecting screw rod (6) penetrates from one end of the strip-shaped mounting hole (51) and is limited in the other end.

4. The natural gas production vertical centrifugal pump damping device according to claim 3, wherein an embedded portion (52) extends downward from the periphery of the damping base plate (5), and the embedded portion (52) is bent outward; the inside bar mounting hole (51) that corresponds of downside of vibration damping substrate (5) is equipped with a mounting groove (53), mounting groove (53) supply end cap (61) of connecting screw (6) to penetrate the installation.

5. The damping device of the vertical centrifugal pump for natural gas production according to claim 1, wherein the damping spring (7) is a compression spring, and a second damping rubber gasket (71) is arranged between the damping base plate (5) and the first hoop support base (3) and between the damping spring and the second hoop support base (4).

6. The damping device of a vertical centrifugal pump for natural gas production according to any one of claims 1 to 5, characterized in that the first hoop support base (3) comprises two first semicircular hoop members (32), and the two first semicircular hoop members (32) are connected by bolts; a first groove (321) is formed in the inner side of the first semicircular hoop part (32) along the circumferential direction, the first wear-resistant rubber pad (31) is installed in the first groove (321), and the thickness of the first wear-resistant rubber pad (31) is smaller than the depth of the first groove (321); the upper surface and the lower surface of the first groove (321) are respectively matched with the base (11) and the outer cylinder (2).

7. The damping device of the vertical centrifugal pump for natural gas production according to claim 6, wherein the second hoop support base (4) comprises two second semicircular hoop members (42), and the two second semicircular hoop members (42) are connected through bolts; the inner side of the second semicircular hoop member (42) is provided with a second groove (421) along the circumferential direction, the second wear-resistant rubber pad (41) is arranged in the second groove (421), and the thickness of the second wear-resistant rubber pad (41) is larger than the depth of the second groove (421).