Vane pump and delivery system

Abstract

The invention relates to the field of fluid conveying or supercharging equipment, and discloses a vane pump and a conveying system.The vane pump comprises a pump shell (1) and an impeller (2) rotatably installed in an inner cavity of the pump shell (1), and a liquid drainage channel (3) for communicating the inner cavity to the external space is formed in the bottom of the pump shell (1); the plunger valve (4) penetrates through the whole liquid discharging channel (3) and extends. According to the vane type pump, a dead zone where a conveying medium accumulates in the pump body can be eliminated, so that solid particles, slurry or reaction products contained in the conveying medium are effectively prevented from blocking the liquid discharging channel, when the plunger valve (4) is detached from the bottom of the pump shell, it is guaranteed that the liquid discharging channel (3) is unobstructed, the remaining conveying medium in the pump body is smoothly discharged, and the service life of the pump body is prolonged. Therefore, the maintenance efficiency is improved, the labor intensity is reduced, and the operation safety of maintenance personnel can be ensured even under the working condition that harmful substances such as hydrocarbons and the like are contained in a conveying medium, a solidification product or a reaction product.

Description

Technical Field

[0001] The present invention relates to fluid conveying or pressurizing equipment, and particularly to a vane pump. On this basis, the present invention also relates to a conveying system including the vane pump. Background Art

[0002] A pump is a machine that conveys fluid or pressurizes fluid, which transmits the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid. It is mainly used to convey liquids such as water, oil, acid-base solution, emulsion, suspension, and liquid metal, and can also convey gas-liquid mixtures and liquids containing suspended solids, or pressurize these liquids. According to the working principle, pumps are divided into positive displacement pumps, vane pumps, jet pumps, etc.

[0003] Among them, according to the characteristics of its impeller and flow channel structure, vane pumps can be further divided into centrifugal pumps, axial flow pumps, mixed flow pumps, vortex pumps, etc., which rely on the impeller to drive the liquid to rotate at high speed and transfer mechanical energy to the conveyed liquid. In working conditions for conveying fluid media or easily condensable media with a high solid content or slurry concentration, such as Figure 1 shown, solid particles and slurry contained in the residual conveying medium in the pump body are likely to accumulate and agglomerate in the drain pipe 1', or the components in the conveying medium solidify or react to produce solid products in the drain pipe 1'. When the plug is removed from the drain pipe 1' to discharge the residual conveying medium, the drain pipe is blocked by solid particles, slurry, or reaction products, resulting in unsmooth material discharge and cumbersome cleaning and maintenance processes. When the conveying medium, solidified or reaction products contain harmful substances such as hydrocarbons, it is also easy for maintenance personnel to inhale them due to the volatilization of these residual substances during other operations or cause explosion accidents, increasing safety risks.

[0004] In view of this, it is necessary to provide a vane pump that can effectively prevent the drain pipe from being blocked by solid particles, slurry, or reaction products contained in the conveying medium, resulting in cumbersome cleaning and maintenance processes or safety risks. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems existing in the prior art that the drain pipe is blocked by solid particles, slurry, or reaction products contained in the conveying medium, resulting in unsmooth material discharge, and further causing cumbersome cleaning and maintenance processes or safety risks of the vane pump. A vane pump is provided, which can effectively prevent the drain passage from being blocked by solid particles, slurry, or reaction products contained in the conveying medium, so as to smoothly discharge the residual conveying medium in the pump body, improve the maintenance efficiency, and reduce the labor intensity and safety risks.

[0006] To achieve the above object, on the one hand, the present invention provides a vane pump, which includes a pump housing and an impeller rotatably installed in the inner cavity of the pump housing. A liquid discharge channel communicating the inner cavity to the external space is provided at the bottom of the pump housing, and a plunger valve extending through the entire liquid discharge channel is detachably connected thereto.

[0007] Preferably, a convex column extending away from the inner cavity is provided on the outer wall surface of the pump housing, and the liquid discharge channel extends through the convex column and communicates with the external space.

[0008] Preferably, the plunger valve includes a flange and a valve stem extending from the flange. The flange is detachably connected to the outer end surface of the convex column by bolts, and the valve stem extends through the entire liquid discharge channel.

[0009] Preferably, a pull buckle is provided on the end surface of the flange facing away from the inner cavity.

[0010] Preferably, one end of the valve stem facing the inner cavity is flush with the wall surface of the inner cavity and has a smooth transition.

[0011] Preferably, the outer diameter of the valve stem is equal to the inner diameter of the liquid discharge channel.

[0012] Preferably, the extending direction of the liquid discharge channel is inclined relative to the vertical direction, so that the outer end surface of the convex column faces obliquely downward.

[0013] Preferably, the convex column is integrally cast with the pump housing.

[0014] Preferably, the vane pump is a centrifugal pump, and / or the pump housing has a horizontally opened inlet and a vertically upwardly opened outlet.

[0015] On the second aspect, the present invention provides a conveying system, which includes the above-mentioned vane pump.

[0016] Through the above technical solutions, the vane pump of the present invention detachably connects a plunger valve extending through the entire liquid discharge channel at the bottom of the pump housing, which can eliminate the dead zone where the conveying medium accumulates in the pump body (liquid discharge channel), thereby effectively preventing the solid particles, slurry or reaction products contained in the conveying medium from blocking the liquid discharge channel. When the plunger valve is removed from the bottom of the pump housing, the liquid discharge channel is ensured to be unobstructed, and the residual conveying medium in the pump body is smoothly discharged, thereby improving the maintenance efficiency and reducing the labor intensity. Even under the working conditions where the conveying medium, solidification or reaction products contain harmful substances such as hydrocarbons, the operation safety of maintenance personnel can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a partial structural cross-sectional view of a vane pump with a liquid discharge pipe in the prior art;

[0018] Figure 2 is a cross-sectional view of a vane pump according to a preferred embodiment of the present invention;

[0019] Figure 3 is Figure 2 a partially enlarged view of the vane pump in , where the plunger valve is removed from the pump housing.

[0020] Description of reference numerals

[0021] 1 - pump housing; 11 - inlet; 12 - outlet; 2 - impeller; 3 - liquid discharge channel; 4 - plunger valve; 41 - flange; 42 - valve stem; 43 - buckle; 5 - stud; 6 - bolt; 1' - liquid discharge pipe. Detailed implementation manners

[0022] The following describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the present invention, and are not used to limit the present invention.

[0023] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, left, and right" generally refer to the upper, lower, left, and right shown in the reference drawings; "inner and outer" refer to the inner and outer relative to the contour of each component itself.

[0024] Referring to Figure 2 and Figure 3 as shown, the present invention provides a vane pump. Typically, the vane pump can be, for example, a centrifugal pump, and includes a pump housing 1 and an impeller 2 rotatably installed in the inner cavity of the pump housing 1. The impeller 2 can be driven by a prime mover such as an electric motor to rotate in the inner cavity of the pump housing 1, so as to drive the liquid to rotate at a high speed in the inner cavity, thereby transporting the liquid or increasing the pressure of the liquid. The pump housing 1 may be provided with an inlet 11 and an outlet 12. During the rotation of the impeller 2, the liquid to be transported or pressurized is sucked into the inner cavity of the pump housing 1 through the inlet 11, and then output through the outlet 12. In the illustrated preferred embodiment, the inlet 11 is horizontally opened on the pump housing 1 and is arranged coaxially and oppositely to the rotating shaft for driving the impeller 2 to rotate; the outlet 12 is vertically upwardly opened on the pump housing 1 and is generally directly opposite to the radial direction of the impeller 2. The liquid to be transported or pressurized may be, for example, a liquid medium containing slurry or other easily condensable media. After being used for a period of time or under appropriate circumstances, it is necessary to discharge the residual transport medium in the inner cavity of the pump housing 1 for cleaning, maintenance, or other operations.

[0025] To this end, the vane pump of the present invention is provided at the bottom of the pump housing 1 with a liquid discharge passage 3 that communicates the inner cavity of the pump housing 1 to the external space, and a plunger valve 4 that extends through the entire liquid discharge passage 3 is detachably connected thereto. Thus, when operations such as cleaning or maintenance are required, it is only necessary to remove the plunger valve 4 from the bottom of the pump housing 1, and the remaining conveying medium can be discharged from the inner cavity of the pump housing 1 under the action of gravity. In the present invention, the plunger valve 4 refers to a plugging structure that plugs the liquid discharge passage 3 in a plunger manner, that is, it extends through the liquid discharge passage 3. Since the plunger valve 4 is arranged to extend through the entire liquid discharge passage 3, dead zones where the conveying medium accumulates in the pump body (specifically, the liquid discharge passage 3) can be eliminated, thereby effectively preventing the solid particles, slurry or reaction products contained in the conveying medium from clogging the liquid discharge passage 3. When the plunger valve 4 is removed from the bottom of the pump housing 1, the liquid discharge passage 3 can be ensured to be unobstructed, so as to smoothly discharge the remaining conveying medium in the pump body, thereby improving the maintenance efficiency and reducing the labor intensity. Even in working conditions where the conveying medium, solidified or reaction products contain harmful substances such as hydrocarbons, the operation safety of maintenance personnel can be ensured.

[0026] The vane pump of the present invention can be arranged to have a liquid discharge passage 3 and a plunger valve 4 in an appropriate form. For example, the liquid discharge passage 3 can be directly formed by punching holes in the pump housing 1, or formed to have a straight or curved extension path. In order to minimize the risk of blockage as much as possible and facilitate the setting of the plunger valve 4, the liquid discharge passage 3 preferably extends along a straight path. In the illustrated preferred embodiment, a convex post 5 extending in a direction away from the inner cavity of the pump housing 1 is provided on the outer wall surface of the pump housing 1, and the liquid discharge passage 3 passes through the convex post 5 and communicates with the external space. Thus, the plunger valve 4 can be detachably connected to the bottom of the pump housing 1 through a fastener connected to the convex post 5, and reliable connection is not difficult to achieve due to the small wall thickness of the pump housing 1. Generally, the pump housing 1 is a casting. In order to ensure the connection sealing performance, the convex post 5 can be integrally cast with the pump housing 1 and machined to form relevant structures (such as its outer end face, screw holes, etc.) for detachably connecting the plunger valve 4.

[0027] According to the above, the present invention avoids the entry of the conveying medium and the like into the liquid discharge passage 3 by making the plunger valve 4 occupy the entire space in the liquid discharge passage 3 during the operation of the vane pump, so that the liquid discharge passage 3 can be ensured to be unobstructed when the plunger valve 4 is removed, and the remaining conveying medium in the pump body can be smoothly discharged. To this end, the plunger valve 4 can be arranged to occupy the entire space in the liquid discharge passage 3 in an appropriate manner. For example, the liquid discharge passage 3 can be arranged as a screw hole, and the plunger valve 4 can have an external thread screwed into the screw hole, so that it can be directly screwed into the liquid discharge passage 3. However, after being used for a period of time, some residual substances will inevitably accumulate in the thread of the liquid discharge passage 3, resulting in difficulty in screwing the plunger valve 4 in or out.

[0028] In the illustrated preferred embodiment, the plunger valve 4 is provided to include a flange 41 and a valve stem 42 extending from the flange 41. Among them, the flange 41 is detachably connected to the outer end surface of the stud 5 by bolts 6, and the valve stem 42 extends through the entire drain passage 3. Thus, the stud 5 can be integrally cast with the pump housing 1, and then its outer end surface is machined into a plane that can fit well with the flange 41 of the plunger valve 4, and screw holes for connecting the bolts 6 are machined on the outer end surface. The plunger valve 4 is disassembled and assembled by screwing the bolts 6 passing through the flange 41 to the outer end surface of the stud 5 or removing them from the outer end surface. At the same time, the valve stem 42 can be a smooth shaft that fits with the drain passage 3. Through this setting, the connection part of the plunger valve 4 fastened to the stud 5 and the part occupying the space in the drain passage 3 are separately arranged, which can effectively avoid the influence of possible residual substances in the drain passage 3 on the connection reliability and convenience. And, in each connection, the valve stem 42 can basically push all the residual substances in the drain passage 3 back into the inner cavity of the pump housing 1 to avoid the accumulation of these residual substances in the drain passage 3. For this reason, the outer diameter of the valve stem 42 can be set to be equal to the inner diameter of the drain passage 3, that is, there is only a fit tolerance.

[0029] Although it is necessary to occupy the entire extension space of the drain passage 3, the length of the valve stem 42 should not extend into the inner cavity of the pump housing 1 so as not to affect the energy conversion efficiency of the impeller to the conveyed medium. In a preferred embodiment, one end of the valve stem 42 facing the inner cavity is flush with the wall surface of the inner cavity and has a smooth transition. That is to say, due to the complementation of the end surface of the valve stem 42, the inner cavity wall surface of the pump housing 1 has the same surface structure in the part where the drain passage 3 is provided as in other wall surface parts, so that the inner cavity of the pump housing 1 forms a rotary contour. For this reason, for example, when the inner cavity wall surface of the pump housing 1 in the part where the drain passage 3 is provided should be an arc surface, one end of the valve stem 42 facing the inner cavity is formed into a corresponding arc surface.

[0030] The drain passage 3 should be provided at the bottom of the pump housing 1 so that the liquid in the inner cavity of the pump housing 1 can be discharged under the action of gravity. In order to take into account the disassembly and assembly convenience of the plunger valve 4, the drain passage 3 can be set to be inclined relative to the vertical direction in its extending direction. For example, as shown in the figure, the stud 5 is provided on the side part of the bottom wall of the pump housing 1, and its outer end surface faces obliquely downward so that the operator can conveniently remove the plunger valve 4 from the pump housing 1.

[0031] In addition, in the case where the plunger valve 4 is provided to include a flange 41 and a valve stem 42, a pull buckle 43 can be provided on the end surface of the flange 41 facing away from the inner cavity of the pump housing 1, so as to facilitate pulling the plunger valve 4 through a maintenance tool passing through the pull buckle 43 and pulling out the valve stem 42 from the drain passage 3.

[0032] For better understanding of the present invention, the operation mode of the vane pump in the preferred embodiment of the present invention will be described below in conjunction with the accompanying drawings:

[0033] As shown in Figure 2 and Figure 3 When the vane pump is in operation or standby, the plunger valve 4 is connected to the pump housing 1 (stud 5) through its flange 41. At this time, the valve stem 42 of the plunger valve 4 penetrates the entire drainage channel 3, and there is almost no gap or a very small gap between them, and only a very small amount of material may enter the drainage channel 3. When the impeller pump needs to be overhauled, the bolts screwed to the stud 5 are removed, and then the valve stem 42 is pulled outwards through the pull buckle 43 on the flange 41 by using a maintenance tool until the valve stem 42 is completely pulled out of the drainage channel 3. After being pulled out, there is almost no material residue in the drainage channel 3. After the inspection and maintenance are completed, the plunger valve 4 is inserted into the drainage channel 3 again, and then the bolt 6 is tightened.

[0034] The vane pump of the present invention can be various types of pumps such as centrifugal pumps, axial flow pumps, mixed flow pumps, and vortex pumps that rely on the impeller to drive the liquid to rotate at high speed and transfer mechanical energy to the conveyed liquid, and it can be used in a conveying system or a pressurization system. Therefore, the present invention also provides a conveying system including the above-mentioned vane pump, and the conveying system has good usability and high safety.

[0035] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, including the combination of each specific technical feature in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and all fall within the protection scope of the present invention.

Claims

1. A vane pump, comprising a pump housing (1) and an impeller (2) rotatably mounted in the inner cavity of the pump housing (1), characterized in that, The bottom of the pump housing (1) is provided with a liquid discharge channel (3) that communicates the inner cavity to the external space, and a plunger valve (4) that extends through the entire liquid discharge channel (3) is detachably connected thereto.

2. The vane pump according to claim 1, characterized in that, The outer wall surface of the pump housing (1) is provided with a convex post (5) that extends away from the inner cavity, and the liquid discharge channel (3) extends through the convex post (5) and communicates to the external space.

3. The vane pump according to claim 2, characterized in that, The plunger valve (4) includes a flange (41) and a valve stem (42) that extends from the flange (41). The flange (41) is detachably connected to the outer end surface of the convex post (5) by bolts (6), and the valve stem (42) extends through the entire liquid discharge channel (3).

4. The vane pump according to claim 3, characterized in that, A pull tab (43) is provided on the end surface of the flange (41) facing away from the inner cavity.

5. The vane pump according to claim 3, characterized in that, One end of the valve stem (42) facing the inner cavity is flush with the wall surface of the inner cavity and has a smooth transition.

6. The vane pump according to claim 3, characterized in that, The outer diameter of the valve stem (42) is equal to the inner diameter of the liquid discharge channel (3).

7. The vane pump according to claim 3, characterized in that, The extending direction of the liquid discharge channel (3) is inclined relative to the vertical direction, so that the outer end surface of the convex post (5) faces obliquely downward.

8. The vane pump according to claim 1, characterized in that, This vane pump is a centrifugal pump, and / or the pump housing (1) has a horizontally opened feed port (11) and a vertically upward opened discharge port (12).

9. A conveying system, characterized in that, This conveying system includes the vane pump according to any one of claims 1 to 8.

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