阅读说明：本技术 船用容积式排污泵 (Volumetric sewage pump for ship ) 是由 姜大连 申小强 吕金喜 袁霄 凌素琴 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种船用容积式排污泵,它包括泵盖、诱导轮、泵体、斜盘轮、轴封、泵盖、轴承座和泵轴。所述泵体为三通薄壁圆筒,朝上径向伸出的出口位于平置圆筒中段,位于泵体圆筒内的一段泵轴套装斜盘轮。所述泵盖端面中部预留的圆形通孔构成泵体的进口,该进口与泵轴配置的诱导轮配合,直接构成位于泵进口处的前置增压结构。本发明泵体内腔结构简洁、无外凸或曲面构件,运行时及使工作介质中含有纤维状污物,也不会发生运动件被缠的问题。由于本发明从结构上克服了易堵塞问题,显著地提高设备无故障运行时间,减少泵拆卸频率,可实现减少用户维护成本的目的。(The invention discloses a marine positive displacement sewage pump which comprises a pump cover, an inducer, a pump body, a swash plate wheel, a shaft seal, a pump cover, a bearing seat and a pump shaft. The pump body is a three-way thin-wall cylinder, an outlet extending upwards in the radial direction is positioned in the middle section of the horizontally-arranged cylinder, and a section of pump shaft positioned in the cylinder of the pump body is sleeved with a swash plate wheel. The circular through hole reserved in the middle of the end face of the pump cover forms an inlet of the pump body, and the inlet is matched with an inducer arranged on the pump shaft to directly form a front pressurizing structure located at the inlet of the pump. The pump body has a simple inner cavity structure and no convex or curved surface component, and when the pump body runs, the working medium contains fibrous dirt, and the problem that a moving part is wound can be avoided. The invention structurally overcomes the problem of easy blockage, obviously improves the fault-free running time of the equipment, reduces the pump disassembly frequency and can realize the purpose of reducing the maintenance cost of a user.)

1. A marine positive displacement dredge pump comprises a pump cover (1), an inducer (2), a pump body (3), a swash plate wheel (4), a shaft seal (5), a gland (6), a bearing seat (7) and a pump shaft (8); the large end face of the bearing seat (7) is coaxially and hermetically connected with the end face of the inner side of the pump body (3), and the pump shaft (8) axially penetrates through a gland (6), a shaft seal (5) and a bearing which are arranged in the bearing seat (7) to form a fixed shaft rotating structure relative to the bearing seat (7); the method is characterized in that: the pump body (3) is a prone three-way thin-wall cylinder, an outlet extending upwards in the radial direction is positioned at the middle section of the horizontally arranged cylinder, and a section of pump shaft (8) positioned in the axial cylinder of the pump body (3) is sleeved with a swash plate wheel (4); the pump cover (1) is connected with the end face of the outer side of the pump body (3) in a sealing mode, an axial circular through hole reserved in the middle of the end face of the pump cover (1) forms an inlet penetrating through the pump body (3), the inlet is matched with an inducer (2) arranged on the pump shaft (8), and a front pressurizing structure located at the inlet of the pump is directly formed.

2. The marine positive displacement dredge pump of claim 1, wherein: the prone cylinder of the pump body (3) is vertical to the axis of the outlet extending out in the radial direction.

3. The marine positive displacement dredge pump of claim 1, wherein: the diameter of an axial through hole reserved in the pump cover (1) is equal to the diameter of a radial outlet of the pump body (3), and the two positions are 90 degrees different.

4. The marine positive displacement dredge pump of claim 1, wherein: the normal section of the swash plate wheel (4) is oval, and the periphery of the swash plate wheel (4) is matched with the inner wall of the axial cylinder of the pump body (3).

Technical Field

The invention belongs to a technical improvement scheme in the technical field of fluid machinery, and particularly relates to a pump, in particular to a sewage pump for a ship.

Background

According to the international maritime organization, large and medium-sized ships in use need to be provided with production sewage treatment devices, otherwise, the navigation is limited due to the sewage discharge not reaching the standard. The domestic sewage treatment device for the ship is usually arranged at the bottom of a cabin, and the domestic sewage treatment device arranged at a low position is convenient for efficiently collecting and precipitating sewage. However, another practical problem with this construction is the increased difficulty of decontamination. The sewage disposal device equipped in the commercial marine domestic sewage treatment device is a centrifugal sewage pump. The centrifugal sewage pump belongs to a general product, has simple structure and easy matching, and can achieve the aim of effectively discharging sewage. Because the blades of the built-in impeller of the centrifugal sewage pump are of a spiral type, fibrous sewage is easy to wind in the blades of the curved surface no matter in the open impeller or the closed impeller, and once the inlet end of the impeller is wound too much, the inlet end of the impeller is blocked, so that the conveying efficiency of the sewage pump is directly reduced, and even the sewage pump fails. Once the inlet end of the impeller is wound by the fibrous dirt, although the blades cannot be damaged, the centrifugal sewage pump is inconvenient to disassemble at the bottom of the cabin, and a user has an improved design requirement for the operation, so that the maintenance cost is reduced, and the operation efficiency of the domestic sewage treatment device is improved.

Disclosure of Invention

The invention mainly aims at the problem that an impeller inlet of a commercial centrifugal sewage pump is easy to be wound by fibrous sewage, and provides a marine positive displacement sewage pump without winding conditions in the structure.

The invention achieves the technical aim through the following technical scheme.

A marine positive displacement dredge pump comprises a pump cover, an inducer, a pump body, a swash plate wheel, a shaft seal, a gland, a bearing seat and a pump shaft. The large end face of the bearing seat is coaxially and hermetically connected with the end face of the inner side of the pump body, and the pump shaft axially penetrates through a gland, a shaft seal and a bearing which are arranged in the bearing seat, so that a fixed shaft rotating structure relative to the bearing seat is formed. The improvement is that: the pump body is a prone three-way thin-wall cylinder, an outlet extending upwards in the radial direction is located in the middle section of the horizontally arranged cylinder, and a section of pump shaft located in the axial cylinder of the pump body is sleeved with a swash plate wheel. The pump cover is connected with the end face of the outer side of the pump body in a sealing mode, an axial circular through hole reserved in the middle of the end face of the pump cover forms an inlet penetrating through the pump body, and the inlet is matched with an inducer arranged on the pump shaft to directly form a front pressurizing structure located at the inlet of the pump.

As a further improvement, the pump body prone position cylinder is perpendicular to the outlet axis extending out in the radial direction.

As a further improvement scheme, the diameter of an axial through hole reserved in the pump cover is equal to the diameter of a radial outlet of the pump body, and the difference between the two positions is 90 degrees.

As a further improvement scheme, the normal section of the swash plate wheel is oval, and the periphery of the swash plate wheel is matched with the inner wall of the axial cylinder of the pump body.

Compared with the prior art, the invention has the following positive effects:

1. the inducer and the swash plate wheel are coaxially arranged, and the series linkage structure is simple, compact and reasonable and meets the marine matching conditions;

2. a preposed pressurizing structure is additionally arranged at the inlet of the pump, and the pressurizing input directly improves the suction condition of the pump and improves the sewage discharge capacity of the pump;

3. the plate-shaped swash plate wheel is matched with the inner wall of the pump body to form a pump structure for alternately changing the volume of the inner cavity of the pump body, and the problem that a moving part is wound can be avoided because the inner cavity of the pump does not have an outward convex part and the conveyed medium contains fibrous dirt, so that the fault-free running time of equipment can be obviously improved, and the maintenance cost of a user is greatly reduced.

Drawings

FIG. 1 is a schematic sectional view of the structure of the present invention.

Detailed Description

The invention is further explained below with reference to the figures and with reference to the examples.

The embodiment of the marine positive displacement sewage pump shown in figure 1 is used for matching with a 20T/h domestic sewage treatment device. The marine positive displacement dredge pump is a pump product formed by connecting two groups of rotating bodies with different structural forms in series, and comprises a pump cover 1, an inducer 2, a pump body 3, a swash plate wheel 4, a shaft seal 5, a gland 6, a bearing seat 7 and a pump shaft 8. The bearing seat 7 is a supporting component of the pump shaft 8, and the large end surface of the bearing seat is coaxially and hermetically connected with the end surface of the inner side of the pump body 3. The pump shaft 8 is a cylindrical shaft, the pump shaft 8 axially penetrates through a gland 6, a shaft seal 5 and a matched bearing which are arranged in a bearing seat 7, and the matching forms a fixed shaft rotating structure relative to the bearing seat 7. The pump body 3 is a main body component, the pump body 3 in the embodiment is a prone three-way thin-walled cylinder, an outlet extending upwards in the radial direction is located in the middle section of the horizontally arranged cylinder, and the cylinder of the pump body 3 is required to be perpendicular to the axis of the outlet extending in the radial direction. A section of pump shaft 8 positioned in the cylinder of the pump body 3 is sleeved with a swash plate wheel 4, and the swash plate wheel 4 rotates along with the pump shaft 8. The plate surface of the swash plate wheel 4 is inclined relative to the axis of the pump shaft 8, and divides the inner cavity of the pump body 3 into two independent and alternatively-changed cavities, one is a suction cavity communicated with the inlet, and the other is a discharge cavity communicated with the outlet. The swash plate wheel 4 rotating with the pump shaft 8 is matched with the inner wall of the cylinder in the axial direction of the pump body 3 through the periphery, and the normal section of the swash plate wheel 4 configured in the structure is elliptic. The pump cover 1 is similar to a flange, an axial circular through hole is reserved in the middle of the end face, the diameter of the axial circular through hole is equal to the diameter of a radial outlet of the pump body 3, the position difference between the axial circular through hole and the radial outlet is 90 degrees, and after the pump cover 1 is hermetically connected with the end face of the outer side of the pump body 3, the axial circular through hole reserved in the middle of the end face of the pump cover 1 forms an inlet of the pump body. The inducer 2 is arranged at the cantilever end of the pump shaft 8 and is matched with a circular through hole reserved in the middle of the end face of the pump cover 1 to directly form a front pressurizing structure at the pump inlet.

In the structure, the pump shaft 8 drives the inducer 2 and the swash plate wheel 4 which are coaxially connected in series to rotate together, and under the action of the inducer 2, the inlet end of the pump locally forms negative pressure, so that the working condition is favorable for adsorbing precipitated dirt. On the other hand, the swash plate wheel 4 in the pump body 3 rotates synchronously, so that the volumes of the swash plate wheel 4 on the two sides of the inner cavity of the pump body 3 are changed in an equivalent and alternate mode. When the volume on the inlet side is gradually increased from small to large, the formed medium is sucked into the working condition, and when the volume on the outlet side is gradually decreased from large to small, the formed medium is pressed out of the working condition. As long as the pump shaft 8 continuously rotates, the working conditions are continuously and equivalently alternated, so that the expectation of barrier-free pollution discharge is achieved.

The marine positive displacement dredge pump has a simple inner cavity structure and no convex or curved surface component, and the workpiece medium contains fibrous dirt during operation, so that the problem that a moving part is wound can be avoided. The invention structurally overcomes the problem of easy blockage, obviously improves the fault-free running time of the equipment, reduces the pump disassembly frequency and easily realizes the purpose of reducing the maintenance cost of a user.