High-chromium cast iron centrifugal pump

Abstract

The utility model relates to the field of centrifugal pumps, in particular to a high-chromium cast iron centrifugal pump. The pump comprises a base, a pump shell, a pumping piece and a pressure reduction assembly. The pump shell is arranged on the base; a liquid inlet pipe is arranged at one end of the pump shell, and a liquid outlet pipe is arranged at the other end. The pumping piece is arranged in the pump shell and pumps liquid into the liquid outlet pipe from the liquid inlet pipe. The pressure reduction assembly is arranged on the liquid inlet pipe and stretches into the liquid inlet pipe from the communicating pipe through the multiple plugging blocks, so that liquid enters the pump shell from the communicating pipe, and the hydraulic pressure is reduced. The second driving mechanism is started to drive the multiple gears, the first bevel gear, the corresponding second bevel gear and the corresponding threaded rod to rotate, the multiple plugging blocks stretch into the liquid inlet pipe, the liquid inlet ends of the communicating pipes are opened, and therefore liquid enters the pump shell through the multiple communicating pipes and is dispersed. Therefore, the pressure load of the centrifugal pump is effectively reduced, and the risk that the centrifugal pump is broken and damaged due to high-pressure impact is reduced.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal pumps, in particular to a high-chromium cast iron centrifugal pump. Background Art

[0002] High chromium cast iron centrifugal pump is a centrifugal pump made of high chromium cast iron material, with excellent wear resistance and corrosion resistance, widely used in many fields. It can be used for mining, dredging, transportation of tailings sand, concentrate sand, ash, coal slime, iron powder and other highly abrasive and high-concentration slurries.

[0003] A Chinese patent document with authorization announcement number CN219345086U proposes a horizontal double-suction centrifugal pump, including a pump body that can be used for conveying fertilizer raw materials, a mounting assembly, which is arranged on the pump body, a limit assembly, which is arranged in the mounting assembly and abuts against the pump body, and a reinforcement assembly, which is arranged between the mounting assembly and the pump body and is used to assist in limiting the limit assembly.

[0004] In the above application, although the pump body itself is made more stable by setting the limit assembly at the pump body connection and then fixing the pump body connection with the reinforcement assembly, only reinforcing the pump body cannot effectively reduce the liquid impact when the hydraulic pressure is too large. In addition, the high-chromium cast iron centrifugal pump has a high chromium content, which reduces the toughness and may also increase the brittleness of the material. This may affect the impact resistance of the pump and increase the risk of the pump body breaking when it is impacted. Utility Model Content

[0005] In view of the problems existing in the background technology, a high chromium cast iron centrifugal pump is proposed.

[0006] The utility model proposes a high-chromium cast iron centrifugal pump, comprising a base, a pump casing, a pumping member and a pressure reducing assembly. The pump casing is arranged on the base; a liquid inlet pipe is arranged at one end of the pump casing, and a liquid outlet pipe is arranged at the other end. The pumping member is arranged in the pump casing, and pumps the liquid from the liquid inlet pipe to the liquid outlet pipe. The pressure reducing assembly is arranged on the liquid inlet pipe, and a plurality of blocking blocks extend from the connecting pipe into the liquid inlet pipe, so that the liquid enters the pump casing from the connecting pipe to reduce the hydraulic pressure. The pressure reducing assembly comprises a driving member; and a pressure reducing member that is driven by the driving member to open / close the liquid inlet end of the connecting pipe by the blocking block.

[0007] Preferably, the pumping member includes a driving mechanism 1 arranged on the pump housing; the driving end of the driving mechanism 1 is connected to an impeller; and the impeller is rotatably arranged in the pump housing.

[0008] Preferably, a plurality of pressure reducing members are provided in an annular array around the liquid inlet pipe.

[0009] Preferably, the pressure reducing member includes a communicating pipe with both ends communicating with the liquid inlet pipe. The end far from the pump housing is the liquid inlet end, and the end close to the pump housing is the liquid outlet end. A threaded rod is rotatably connected to the communicating pipe. The threaded rod is arranged at the liquid inlet end, and a plugging block is threadedly connected thereto. A sliding plate is provided on the plugging block. The sliding plate is slidably connected to a chute opened on the inner wall of the communicating pipe.

[0010] Preferably, the driving member includes a slide rail arranged on the base. A toothed ring is slidably connected in the slide rail. A plurality of gears, which are in one-to-one correspondence with multiple pressure reducing members, are meshed and connected inside the toothed ring. A first bevel gear is coaxially connected to each of the plurality of gears. Both the gear and the first bevel gear are rotatably connected to a fixing plate arranged on the corresponding communicating pipe. One of the gears is also connected to the driving end of a driving mechanism two arranged on the fixing plate. A second bevel gear is meshed and connected to one side of each of the plurality of first bevel gears. Each of the plurality of second bevel gears is coaxially connected to the corresponding threaded rod.

[0011] Preferably, the plugging block is spherical.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] For this high-chromium cast iron centrifugal pump, by starting the driving mechanism two to drive a plurality of gears, first bevel gears, corresponding second bevel gears and threaded rods to rotate, a plurality of plugging blocks extend into the liquid inlet pipe, opening the liquid inlet end of the communicating pipe, so that the liquid enters the pump housing through a plurality of communicating pipes, and the liquid is dispersed. Through the pressure reducing component, the high-pressure liquid originally concentrated in the liquid inlet pipe can be dispersed into a plurality of communicating pipes, thereby effectively reducing the pressure load of this centrifugal pump and reducing the risk of rupture and damage of this centrifugal pump due to high-pressure impact. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 is a sectional view of the overall structure of the utility model;

[0016] Figure 3 is a schematic diagram of the structure of the pressure reducing component of the utility model;

[0017] Figure 4 is a schematic diagram of the structure of the sliding plate and the chute of the utility model.

[0018] Reference numerals: 1, base; 2, pump housing; 201, liquid inlet pipe; 202, liquid outlet pipe; 3, pumping member; 31, drive mechanism I; 32, impeller; 4, pressure reducing assembly; 41, pressure reducing member; 411, connecting pipe; 412, threaded rod; 413, plugging block; 414, sliding plate; 415, chute; 42, driving member; 421, slide rail; 422, gear ring; 423, gear; 424, bevel gear I; 425, fixing plate; 426, drive mechanism II; 427, bevel gear II. Detailed implementation mode

[0019] As Figures 1-4 As shown, a high-chromium cast iron centrifugal pump proposed by the present utility model includes a base 1, a pump housing 2, a pumping member 3 and a pressure reducing assembly 4. The pump housing 2 is arranged on the base 1; one end of the pump housing 2 is provided with a liquid inlet pipe 201, and the other end is provided with a liquid outlet pipe 202. The pumping member 3 is arranged in the pump housing 2 and pumps the liquid from the liquid inlet pipe 201 to the liquid outlet pipe 202. The pressure reducing assembly 4 is arranged on the liquid inlet pipe 201, and a plurality of plugging blocks 413 extend into the liquid inlet pipe 201 from the connecting pipe 411, so that the liquid enters the pump housing 2 from the connecting pipe 411 to reduce the hydraulic pressure. The pressure reducing assembly 4 includes a driving member 42; and a pressure reducing member 41 that drives the plugging block 413 to open / close the liquid inlet end of the connecting pipe 411 through the driving member 42.

[0020] Further explanation, the pumping member 3 includes a drive mechanism I 31 arranged on the pump housing 2; the drive mechanism I 31 is a motor; the drive end of the drive mechanism I 31 is connected with an impeller 32; the impeller 32 is rotatably arranged in the pump housing 2. The liquid can be pumped.

[0021] Further explanation, multiple groups of the pressure reducing members 41 are arranged in a circular array with respect to the liquid inlet pipe 201. The pressure reducing member 41 includes a connecting pipe 411 that is communicated with the liquid inlet pipe 201 at both ends, wherein the end far from the pump housing 2 is the liquid inlet end, and the end close to the pump housing 2 is the liquid outlet end; a threaded rod 412 is rotatably connected to the connecting pipe 411; the threaded rod 412 is arranged at the liquid inlet end, and a plugging block 413 is threadedly connected thereto; a sliding plate 414 is arranged on the plugging block 413; the sliding plate 414 is slidably connected to a chute 415 opened on the inner wall of the connecting pipe 411. When the hydraulic pressure is too high, by rotating the threaded rod 412, the plugging block 413 can enter and exit the liquid inlet end of the connecting pipe 411, so as to open / close the liquid inlet end of the connecting pipe 411, and at the same time, most of the pipe orifices of the liquid inlet pipe 201 can be blocked, so that the liquid enters the pump housing 2 from a plurality of connecting pipes 411 and the liquid is dispersed. Through the pressure reducing member 41, the high-pressure liquid originally concentrated in the liquid inlet pipe 201 can be dispersed into a plurality of connecting pipes 411, thereby effectively reducing the pressure load of the centrifugal pump and reducing the risk of the centrifugal pump being damaged by high-pressure impact and cracking.

[0022] Further explanation, the driving member 42 includes a slide rail 421 provided on the base 1; a gear ring 422 is slidably connected in the slide rail 421; a plurality of gears 423 are meshed and connected inside the gear ring 422, which are respectively opposite to the multiple voltage reducing members 41 one by one; a first bevel gear 424 is coaxially connected to each of the plurality of gears 423; both the gear 423 and the first bevel gear 424 are rotatably connected to a fixing plate 425 provided on the corresponding communicating pipe 411; one of the gears 423 is also connected to the driving end of a second driving mechanism 426 provided on the fixing plate 425; the second driving mechanism 426 is a motor; a second bevel gear 427 is meshed and connected to one side of each of the plurality of first bevel gears 424; a plurality of second bevel gears 427 are coaxially connected to the corresponding threaded rods 412. It can drive a plurality of threaded rods 412 to rotate simultaneously, so as to control the closing / opening of the liquid inlet ends of the corresponding communicating pipes 411 by a plurality of blocking blocks 413 simultaneously.

[0023] Further explanation, the blocking block 413 is spherical. It can reduce fluid resistance. And when a plurality of blocking blocks 413 extend into the liquid inlet pipe 201, there are gaps between them, so as to prevent the plurality of blocking blocks 413 from completely closing the liquid inlet pipe 201 and generating a large impact force when the liquid flows through.

[0024] The working principle of the present utility model is as follows: During operation, first start the first driving mechanism 31 to drive the impeller 32 to rotate, and pump the liquid from the liquid inlet pipe 201 to the liquid outlet pipe 202. When the hydraulic pressure is too high, start the second driving mechanism 426 to drive the connected gear 423 and the first bevel gear 424 to rotate, thereby driving the gear ring 422 to rotate, and further driving a plurality of gears 423, first bevel gears 424 and the corresponding second bevel gears 427 and threaded rods 412 to rotate, so that a plurality of blocking blocks 413 extend into the liquid inlet pipe 201, and open the liquid inlet ends of the communicating pipes 411, so that the liquid enters the pump housing 2 through a plurality of communicating pipes 411, and the liquid is dispersed to reduce the hydraulic pressure.

[0025] The embodiments of the present utility model have been described in detail above in conjunction with the drawings, but the present utility model is not limited thereto. Within the knowledge scope of those skilled in the art to which it belongs, various changes can be made without departing from the purpose of the present utility model.

Claims

1. A high chromium cast iron centrifugal pump, characterized in that: include Base (1); A pump housing (2) is arranged on a base (1); a liquid inlet pipe (201) is arranged at one end of the pump housing (2), and a liquid outlet pipe (202) is arranged at the other end; A pumping member (3) disposed in the pump housing (2) and pumping liquid from the liquid inlet pipe (201) to the liquid outlet pipe (202); and a pressure reducing component (4) disposed on the liquid inlet pipe (201) and extending from the connecting pipe (411) into the liquid inlet pipe (201) through a plurality of blocking blocks (413) so that liquid enters the pump housing (2) from the connecting pipe (411) to reduce the hydraulic pressure; The pressure reducing assembly (4) includes a driving member (42); And a pressure reducing member (41) which is driven by a driving member (42) to cause a blocking block (413) to open / close the liquid inlet end of the connecting pipe (411).

2. A high chromium cast iron centrifugal pump according to claim 1, characterized in that: The pumping member (3) comprises a driving mechanism (31) arranged on the pump casing (2); the driving end of the driving mechanism (31) is connected to an impeller (32); and the impeller (32) is rotatably arranged in the pump casing (2).

3. A high chromium cast iron centrifugal pump according to claim 1, characterized in that: A plurality of pressure reducing members (41) are provided in a circular array about the liquid inlet pipe (201).

4. A high chromium cast iron centrifugal pump according to claim 3, characterized in that: The pressure reducing member (41) comprises a connecting pipe (411) whose two ends are connected to the liquid inlet pipe (201), wherein the end away from the pump housing (2) is the liquid inlet end, and the end close to the pump housing (2) is the liquid outlet end; a threaded rod (412) is rotatably connected to the connecting pipe (411); the threaded rod (412) is arranged at the liquid inlet end, and a blocking block (413) is threadedly connected thereto; a sliding plate (414) is provided on the blocking block (413); the sliding plate (414) is slidably connected to a sliding groove (415) provided on the inner wall of the connecting pipe (411).

5. A high chromium cast iron centrifugal pump according to claim 4, characterized in that: The driving member (42) comprises a slide rail (421) arranged on the base (1); a gear ring (422) is slidably connected inside the slide rail (421); a plurality of gears (423) are meshedly connected inside the gear ring (422) and are opposite to the plurality of groups of pressure reducing members (41) one by one; a bevel gear one (424) is coaxially connected to the plurality of gears (423); the gears (423) and the bevel gear one (424) are rotatably connected to a fixing plate (425) arranged on the corresponding connecting pipe (411); one of the gears (423) is also connected to a driving end of a driving mechanism two (426) arranged on the fixing plate (425); one side of the plurality of bevel gears one (424) is meshedly connected to a bevel gear two (427); and the plurality of bevel gears two (427) are coaxially connected to the corresponding threaded rod (412).

6. A high chromium cast iron centrifugal pump according to claim 4, characterized in that: The blocking block (413) is spherical.

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