CN210716030U

CN210716030U - Centrifugal pump bottom valve

Info

Publication number: CN210716030U
Application number: CN201921197179.9U
Authority: CN
Inventors: 张津波; 贾盛伟; 陶世杰; 李健; 胡建平; 宫艳红; 冯雪浦; 黄兴鸿; 齐玉梅; 苏建斌; 白玉; 李雯雯
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-06-09
Anticipated expiration: 2029-07-26

Abstract

The utility model discloses a centrifugal pump bottom valve relates to engineering machine tool technical field, the embodiment of the utility model provides an in the valve body of centrifugal pump bottom valve interval arrangement have a plurality of spacer rings along the radial extension of valve body, the case include with the connecting rod of a plurality of valve clacks of spacer ring one-to-one and connection a plurality of valve clacks, the case can remove between primary importance and second place. When the pump is grouted to the centrifugal pump before starting the pump, the valve core is located the first position, and a plurality of valve clacks and a plurality of corresponding spacer rings are laminated to separate import and export, thereby can separate into a plurality of sealed reservoir beds with the valve body inside, carry out a lot of sealings. When the sealing of the spacer ring and the valve clack of the upper layer is insufficient, liquid flows into the reservoir layer below and is still sealed by the spacer ring and the valve clack below the liquid without leaking. Therefore, the sealing performance of the bottom valve can be ensured, the pump filling can be completed in a short time, and the sufficient liquid reserved in the centrifugal pump is ensured, so that the normal operation of the centrifugal pump is realized.

Description

Centrifugal pump bottom valve

Technical Field

The utility model relates to an engineering machine tool technical field, in particular to centrifugal pump bottom valve.

Background

In the current oil field development, a centrifugal pump is widely used as a main device for conveying crude oil and sewage.

In order to ensure the normal operation of the centrifugal pump, a bottom valve is usually installed at the front end of the inlet pipe of the centrifugal pump, which is immersed in liquid, and comprises a valve body and a valve core. Before starting the pump, the centrifugal pump needs to be pumped, namely liquid is injected into the centrifugal pump, and the valve core is closed under the action of gravity, so that the liquid is reserved in the centrifugal pump. As the liquid remaining in the centrifugal pump increases, the impeller of the centrifugal pump is immersed in the liquid. After the centrifugal pump is started, an impeller of the centrifugal pump rotates to provide power for liquid conveying and convey the liquid out. Meanwhile, as the liquid is output, negative pressure is generated inside the centrifugal pump, the valve core is lifted, the bottom valve is opened, and the liquid is sucked from the inlet of the centrifugal pump.

In realizing the utility model discloses an in-process, the designer discovers that prior art has following problem at least:

the existing bottom valve is sealed by matching the valve core and a sealing layer on the valve body in a single layer. When there is impurity on the sealing layer, can lead to sealed not tight, the in-process liquid of pump priming flows out from the gap of case with the sealing layer department easily, influences the pump priming, causes the suction volume of centrifugal pump not enough, probably damages the centrifugal pump.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a centrifugal pump bottom valve can guarantee to have good leakproofness between case and the valve body of bottom valve to improve the success rate of pump priming, reduce the emergence of the phenomenon of managing to find time of centrifugal pump. The technical scheme is as follows:

the embodiment of the utility model provides a centrifugal pump bottom valve, centrifugal pump bottom valve include valve body and case.

The valve body is tubular and is provided with an inlet and an outlet, and a plurality of spacer rings extending along the radial direction of the valve body are arranged in the valve body at intervals; the valve core comprises a plurality of valve clacks which correspond to the spacing rings one by one and a connecting rod which is connected with the valve clacks, the valve core can move between a first position and a second position, when the valve core is positioned at the first position, the valve clacks are attached to the corresponding spacing rings to separate the inlet from the outlet, when the valve core is positioned at the second position, the valve clacks are separated from the corresponding spacing rings, and the inlet is communicated with the outlet.

Optionally, the surface of the valve flap, which is used for being attached to the corresponding spacer ring, is a convex surface, and the surface of the spacer ring, which is used for being attached to the corresponding valve flap, is a concave surface.

Optionally, the convex surface is a circular arc convex surface.

Optionally, the valve body comprises an upper valve body and at least one connecting pipe which are detachably connected in sequence, and the upper valve body is tubular.

Optionally, the valve body still includes lower valve body, lower valve body with can dismantle the connection between the connecting pipe, the import is located on the valve body down.

Optionally, one of the spacer rings is clamped between the upper valve body and the adjacent connecting pipe, or

One spacer ring is clamped between two adjacent connecting pipes, or

The spacer ring is clamped between the lower valve body and the adjacent connecting pipe.

Optionally, the upper valve body, the connecting pipe and the lower valve body are connected through flanges.

Optionally, the valve core is an aluminum alloy piece.

Optionally, a guide ring is arranged in the valve body, the guide ring is connected with the inner wall of the valve body, and the connecting rod is movably inserted in the guide ring.

Optionally, a screen is fixed at the inlet.

The embodiment of the utility model provides a beneficial effect that technical scheme brought includes at least:

the embodiment of the utility model provides an in the valve body of centrifugal pump bottom valve interval arrangement have a plurality of spacer rings along the radial extension of valve body, the case include with the connecting rod of a plurality of valve clacks of spacer ring one-to-one and connection a plurality of valve clacks, the case can remove between primary importance and second place. When the pump is grouted to the centrifugal pump before starting the pump, the valve core is located the first position, and a plurality of valve clacks and a plurality of corresponding spacer rings are laminated to separate import and export, thereby can separate into a plurality of sealed reservoir beds with the valve body inside, carry out a lot of sealings. When the sealing of the spacer ring and the valve clack of the upper layer is insufficient, liquid flows into the reservoir layer below and is still sealed by the spacer ring and the valve clack below the liquid without leaking. Therefore, the sealing performance of the bottom valve can be ensured, the pump filling can be completed in a short time, and the sufficient liquid reserved in the centrifugal pump is ensured, so that the normal operation of the centrifugal pump is realized. After the pump is started, the valve core is sucked to the second position by negative pressure, the valve clack is separated from the corresponding spacer ring, the inlet is communicated with the outlet, the bottom valve is opened, and liquid is sucked from the inlet.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a centrifugal pump bottom valve provided by an embodiment of the present invention;

fig. 2 is a cross-sectional view of a centrifugal pump bottom valve provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a centrifugal pump bottom valve provided by an embodiment of the present invention;

fig. 4 is a cross-sectional view of a bottom valve of a centrifugal pump according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a bottom valve of a centrifugal pump provided in an embodiment of the present invention. As shown in fig. 1, the centrifugal pump bottom valve includes a valve body 100 and a valve cartridge 200.

The valve body 100 is tubular, the valve body 100 has an inlet 101 and an outlet 102, and a plurality of spacer rings 110 extending in a radial direction of the valve body 100 are spaced apart in the valve body 100.

The valve core 200 includes a plurality of valve flaps 210 corresponding to the spacer rings 110 one by one, and a connecting rod 220 connecting the plurality of valve flaps 210, and the valve core 200 is capable of moving between a first position (the position of the valve core 200 shown in fig. 1) and a second position, when the valve core 200 is located at the first position, the valve flaps 210 are attached to the corresponding spacer rings 110 to separate the inlet 101 and the outlet 102, and when the valve core 200 is located at the second position, the valve flaps 210 are separated from the corresponding spacer rings 110 to communicate the inlet 101 and the outlet 102.

The "plurality" referred to in the embodiment of the present invention includes two or more, for example, the plurality of spacers 110 extending in the radial direction of the valve body 100 includes a first spacer 111 and a second spacer 112.

The embodiment of the utility model provides an in valve body 100 of centrifugal pump bottom valve interval arrangement have a plurality of spacer rings 110 along the radial extension of valve body 100, case 200 includes a plurality of valve clacks 210 with spacer ring 110 one-to-one and the connecting rod 220 of connecting a plurality of valve clacks 210, case 200 can move between first position and second position. When the centrifugal pump is pumped before starting the pump, the valve core 200 is located at the first position, and the plurality of valve flaps 210 are attached to the corresponding plurality of spacer rings 110 to separate the inlet 101 from the outlet 102, so that the interior of the valve body 100 can be divided into a plurality of sealed reservoirs to perform multiple sealing. When the upper spacer ring 110 and the valve flap 210 are not sealed enough, the liquid flows into the reservoir below and is still sealed by the lower spacer ring 110 and the valve flap 210 without leaking out. Therefore, the sealing performance of the bottom valve can be ensured, the pump filling can be completed in a short time, and the sufficient liquid reserved in the centrifugal pump is ensured, so that the normal operation of the centrifugal pump is realized. After the pump is started, the valve core 200 is sucked to the second position by negative pressure, the valve clacks 210 are separated from the corresponding spacer rings 110, the inlet 101 is communicated with the outlet 102, the bottom valve is opened, and liquid is sucked from the inlet 101.

Optionally, the surface of the valve flap 210 for fitting with the corresponding ring spacer 110 is convex, and the surface of the ring spacer 110 for fitting with the corresponding valve flap 210 is concave, so that impurities can be prevented from accumulating on the ring spacer 110 and affecting the seal between the ring spacer 110 and the valve flap 210.

Fig. 2 is a cross-sectional view of a bottom valve of a centrifugal pump according to an embodiment of the present invention. As shown in fig. 2, the spacer ring 110 has a first surface 110a, the first surface 110a is a concave surface, the valve flap 210 has a second surface 211, the second surface 211 is a convex surface, and the first surface 110a can be attached to the second surface 211.

In some embodiments, the second surface 211 of the valve flap 210 is convex with a circular arc. Correspondingly, the first surface 110a of the spacer ring 110 is a circular arc concave surface. The arc may increase the contact area of the first surface 110a and the second surface 211, so that the sealing area is larger, thereby achieving more effective sealing.

The second surface 211 of the valve core 200 and the side surface of the first surface 110a are finished by a numerically controlled lathe, so that the accuracy requirement of the process design requirement can be met by the side surfaces of the second surface 211 and the first surface 110a, and the tight fit of the side surfaces of the second surface 211 and the first surface 110a is guaranteed. Through the side matching sealing of the second surface 211 and the first surface 110a, the problem that a sealing gasket of a common centrifugal pump is used in a high-temperature environment and needs to be frequently replaced due to accelerated aging can be avoided, the workload of workers is reduced, and the working efficiency is improved.

Optionally, the number of the spacer rings 110 and the valve flaps 210 is two, so that the processing can be simplified, and the cost can be reduced.

Optionally, the valve cartridge 200 is an aluminum alloy piece. The aluminum alloy piece has relatively small mass, so that the valve core 200 cannot be increased in weight due to the increase of the number of the valve clacks 210, and the difficulty in lifting the valve core 200 by negative pressure generated by the centrifugal pump is reduced.

The valve body 100 includes an upper valve body 120 and at least one connection pipe 130 detachably connected in sequence, and the upper valve body 120 has a tubular shape. Fig. 3 is a schematic structural diagram of a bottom valve of a centrifugal pump according to an embodiment of the present invention. As shown in fig. 3, the valve body 100 includes an upper valve body 120 and a connection pipe 130, which are detachably connected in sequence, to facilitate maintenance and replacement when the valve flap 210 is damaged.

The valve body 100 further includes a lower valve body 140, the lower valve body 140 is detachably connected to the connection pipe 130, and the inlet 101 is located on the lower valve body 140. A screen is fixed on the outlet 102 to prevent impurities from entering the bottom valve to cause blockage.

One spacer ring 110 is interposed between the upper valve body 120 and the adjacent connecting pipe 130, or one spacer ring 110 is interposed between the adjacent two connecting pipes 130, or one spacer ring 110 is interposed between the lower valve body 140 and the adjacent connecting pipe 130.

As shown in fig. 3, the spacer ring 110 includes a first spacer ring 111 and a second spacer ring 112, the first spacer ring 111 is interposed between the upper valve body 120 and the adjacent connection pipe 130, and the second spacer ring 112 is interposed between the lower valve body 140 and the adjacent connection pipe 130. When the first and

second spacers

111 and 112 need to be replaced, the corresponding upper valve body 120, connecting pipe 130, and lower valve body 140 can be disassembled, respectively, so that the replacement of the first and

second spacers

111 and 112 is easier,

the upper valve body 120, the connection pipe 130 and the lower valve body 140 are flange-connected to each other. As shown in fig. 3, the upper valve body 120 includes a first flange 121, the connection pipe 130 includes a second flange 131 and a third flange 132, the lower valve body 140 includes a fourth flange 141, the first flange 121 is detachably connected to the second flange 131, and the third flange 132 is detachably connected to the fourth flange 141. The first flange 121 and the second flange 131, the third flange 132 and the fourth flange 141 may be detachably connected by bolts 150.

Optionally, a first spacer ring 111 is sandwiched between the first flange 121 and the second flange 131, and a second spacer ring 112 is sandwiched between the third flange 132 and the fourth flange 141, so as to facilitate replacement of the first spacer ring 111 and the second spacer ring 112.

Alternatively, the first spacer 111 may be welded to a surface of the upper valve body 120 that mates with the connection pipe 130, and the second spacer 112 may be welded to a surface of the lower spacer that mates with the connection pipe 130. The first surface 110a of the first spacer ring 111 and the first surface 110a of the second spacer ring 112 are fixed by welding, so that concentricity can be better ensured, and sealing performance between the spacer rings and the valve core 200 can be further ensured.

Optionally, the upper valve body 120 further comprises a connecting flange 122, the connecting flange 122 being adapted to be connected to a pipe flange.

Optionally, the upper valve body 120, the lower valve body 140 and the connecting pipe 130 are cast to ensure the tightness of the valve body 100 itself.

Referring to fig. 2, the valve body 100 has a guide ring 123 therein, the guide ring 123 is connected to an inner wall of the valve body 100, and the connecting rod 220 is movably inserted into the guide ring 123. The valve flap 210 has a guide rod 230 thereon, and the guide rod 230 is slidably coupled to the guide hole 124 to guide during the lifting and lowering of the valve cartridge 200.

In practice, the middle of the guiding ring 123 is provided with a guiding hole 124, and the connecting rod 220 is movably inserted into the guiding hole 124.

Alternatively, as shown in fig. 2, the guide ring 123 is located in the upper valve body 120, the connecting rod 220 extends out of the guide rod 230 along the outlet direction, and the guide rod 230 is disposed at one side of the valve core 200, so as to facilitate the disassembly and replacement of the valve core 200.

Optionally, fig. 4 is a cross-sectional view of a bottom valve of a centrifugal pump according to an embodiment of the present invention, as shown in fig. 4, the guide ring 123 is located in the connecting pipe 130, so that the height of the upper valve body can be saved, thereby reducing the volume of the whole bottom valve.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A centrifugal pump bottom valve, comprising:

the valve body (100), the valve body (100) is tubular, the valve body (100) is provided with an inlet (101) and an outlet (102), and a plurality of spacer rings (110) extending along the radial direction of the valve body (100) are arranged at intervals in the valve body (100); and the number of the first and second groups,

the valve core (200) comprises a plurality of valve flaps (210) corresponding to the spacer rings (110) in a one-to-one mode and a connecting rod (220) connecting the valve flaps (210), the valve core (200) can move between a first position and a second position, when the valve core (200) is located at the first position, the valve flaps (210) are attached to the corresponding spacer rings (110) to separate the inlet (101) and the outlet (102), when the valve core (200) is located at the second position, the valve flaps (210) are separated from the corresponding spacer rings (110), and the inlet (101) is communicated with the outlet (102).

2. A centrifugal pump bottom valve according to claim 1, characterized in that the surface of the valve flap (210) for abutment with the respective spacer ring (110) is convex and the surface of the spacer ring (110) for abutment with the respective valve flap (210) is concave.

3. A centrifugal pump bottom valve according to claim 2, wherein said convex surface is a rounded convex surface.

4. A centrifugal pump bottom valve according to claim 1, characterized in that the valve body (100) comprises an upper valve body (120) and at least one connecting pipe (130) detachably connected in sequence, the upper valve body (120) being tubular.

5. The centrifugal pump foot valve according to claim 4, characterized in that the valve body (100) further comprises a lower valve body (140), the lower valve body (140) is detachably connected with the connecting pipe (130), and the inlet (101) is located on the lower valve body (140).

6. Bottom valve for centrifugal pumps according to claim 5, characterized in that one spacer ring (110) is interposed between the upper valve body (120) and the adjacent connecting pipe (130), or

One spacer ring (110) is clamped between two adjacent connecting pipes (130), or

The spacer ring (110) is clamped between the lower valve body (140) and the adjacent connecting pipe (130).

7. The centrifugal pump foot valve according to claim 5, characterized in that the upper valve body (120), the connecting pipe (130) and the lower valve body (140) are connected by flanges.

8. A centrifugal pump bottom valve according to any one of claims 1-7, characterized in that the valve core (200) is an aluminium alloy piece.

9. A centrifugal pump bottom valve according to any one of claims 1 to 7, characterized in that a guide ring (123) is provided in the valve body (100), the guide ring (123) is connected with the inner wall of the valve body (100), and the connecting rod (220) is movably inserted in the guide ring (123).

10. A centrifugal pump bottom valve according to any one of claims 1-7, characterized in that a screen is fixed at the inlet (101).