CN217898198U - Vane pump - Google Patents

Abstract

The utility model relates to a vane pump, be in including the shell and holding motor and impeller subassembly in the shell, the motor includes stator and rotor, wherein, the impeller subassembly includes the impeller and is used for bearing the impeller skeleton of impeller, the inside of impeller skeleton is hollow in order to form fluidic runner, the impeller is fixed on the inner peripheral surface of impeller skeleton, and the rotor of motor combines integratively on the outer peripheral face of impeller skeleton. The utility model discloses a combine electric motor rotor and impeller skeleton together, avoided using vibration, noise and energy loss scheduling problem that the pump shaft of overlength leads to.

Description

Vane pump

Technical Field

The utility model belongs to the technical field of pump unit, concretely relates to impeller pump.

Background

In a commonly used impeller pump, such as an axial flow pump, a motor and a water pump are usually coupled by a coupling, that is, a rotating shaft of the motor is connected to a pump shaft by the coupling, and an impeller is fixed on the pump shaft so as to be rotated by the rotating shaft of the motor. However, this arrangement causes a number of problems: for example, the cantilever beam structure of the pump shaft, which is too long, causes poor vibration resistance of the pump body; the friction between the impeller and the fixed impeller shell may cause accidents; the overlong pump shaft is easy to bend, so that the operation of the pump is easy to break down; and so on.

In addition, the known automotive electronic fluid pump only realizes the compression of fluid through a single impeller so as to pump a medium, but when the flow rate and the pressure difference demand are relatively large, the single-stage traditional pump class cannot meet the development demand. The common solution is to increase the volume of the impeller and the flow passage and increase the power of the driving motor, however, this results in larger pump size, increased weight and increased cost, and the increased power of the pump consumes more energy. Therefore, in the current situation, the problem that pumps with high flow and large pressure difference have large size needs to be solved urgently.

Therefore, there is a need for a new impeller pump having a more optimal design to overcome the above-mentioned drawbacks of the prior art.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a novel vane pump that can solve a series of problems caused by the use of an excessively long pump shaft.

Another object of the present invention is to provide a novel vane pump, which can solve the problem of large size of the high-flow large-pressure difference pumps.

To this end, the present invention relates to a vane pump, including the shell and accommodate motor and impeller subassembly in the shell, the motor includes stator and rotor, wherein, the impeller subassembly includes the impeller and is used for bearing the impeller skeleton of impeller, the inside of impeller skeleton is hollow in order to form fluidic runner, the impeller is fixed on the inner peripheral surface of impeller skeleton, and the rotor of motor combines integratively on the outer peripheral surface of impeller skeleton.

According to the utility model discloses a preferred embodiment, the rotor of motor is the form of cyclic annular magnet, the impeller skeleton is the form of hollow cylinder, and the rotor of motor is in on the outer peripheral face of impeller skeleton with the impeller skeleton is coaxial to be arranged.

According to a preferred embodiment of the present invention, the two ends of the impeller frame are provided with bearing assemblies for supporting the rotation of the impeller frame.

According to a preferred embodiment of the present invention, the housing comprises an inlet housing defining a fluid inlet, an outlet housing defining a fluid outlet, and a motor housing located between the inlet housing and the outlet housing, the fluid inlet and the fluid outlet being located in a straight line along a direction of fluid flow, and the impeller frame being axially centered and in fluid communication with both the fluid inlet and the fluid outlet.

According to the utility model discloses a preferred embodiment, the rotor of motor passes through the fixed combination of secondary injection moulding technology on the outer peripheral face of impeller skeleton.

According to a preferred embodiment of the present invention, the impeller is fixed to the inner peripheral surface of the impeller frame by screwing, welding, or bonding.

According to the utility model discloses a preferred embodiment, the root of every blade of impeller is equipped with the dovetail, be equipped with on the inner peripheral surface of impeller skeleton along circumference distribution and along the dovetail that the axial link up, the dovetail with the dovetail mutual joint is in the same place through the fix with screw.

According to a preferred embodiment of the present invention, the impeller assembly is a multistage supercharging impeller assembly including at least two stages of impellers distributed along the axial direction.

According to a preferred embodiment of the present invention, the first-stage impeller in the fluid flow direction includes at least three blades, and the number of blades included in the next-stage impeller is equal to or greater than the number of blades included in the previous-stage impeller.

According to a preferred embodiment of the present invention, the motor is a printed circuit board controlled brushless dc motor.

Since the technical scheme is used, the utility model discloses can produce at least one in following profitable technological effect:

1) According to the utility model discloses, the motor part and the pump body part (it is mainly the impeller subassembly part) of impeller pump are integrated as an organic whole, have left out very long power transmission axle between motor part and the impeller in traditional pump from this completely, have overcome a series of defects that this kind of major axis caused, include: the anti-vibration performance of the pump body is improved, the damage caused by the friction between the impeller and the fixed impeller shell is avoided, the operation failure caused by the bending of the long shaft is avoided, the inlet and outlet flow channel of the pump is prevented from being designed into a bent pipe, and meanwhile, the energy loss and noise in power transmission are reduced, so that the efficiency of the pump is obviously improved;

2) According to the utility model, the motor part and the pump body part of the impeller pump are integrated into a whole, so that the size of the impeller pump is reduced particularly in the axial direction, the space layout of the impeller pump is further optimized, the manufacture and the installation of the impeller pump are more convenient, and the production cost is further saved;

3) According to the utility model, the pump shaft positioned in the middle of the pump body part is omitted, so that the sectional area of the flow channel in the pump is obviously increased, and the pumping flow is improved;

4) According to the utility model, a multistage supercharging impeller component can be arranged in the pump body, so that the requirement of large flow and large pressure difference of the impeller pump can be met under the condition of not increasing the rotating speed of the motor;

5) According to the utility model, the size of the whole pump can be greatly reduced by the multi-stage supercharging impeller components which are axially distributed, the structure is simple and the assembly is convenient;

6) According to the utility model discloses, can adopt brushless DC motor as the control unit, further improve impeller pump's life from this.

Drawings

FIG. 1 is a schematic view of an axial flow pump according to the prior art;

fig. 2 is a side sectional view of one embodiment of a vane pump according to the present invention;

fig. 3 is a schematic view of the rotor of the motor in combination with the impeller frame in the above embodiment of the impeller pump according to the present invention;

fig. 4a is a schematic view of a connection structure of a vane of an impeller and an impeller frame in the above embodiment of the impeller pump according to the present invention;

FIG. 4b is an enlarged schematic view of the connection structure of FIG. 4 a; and

fig. 4c is a schematic view of the attachment part on the blade.

In the drawings, the same or similar parts or structures are denoted by the same reference numerals.

Detailed Description

The following describes the technical solution of the present invention in detail with reference to the accompanying drawings. This description is given by way of example only and not as a limitation on the invention.

Fig. 1 is a schematic view of an axial flow pump according to the prior art. As shown in the figure, the shaft of the motor 1 is connected to a pump shaft 10 by means of a coupling 9, the pump shaft 10 extends further down through the bearing body 3 and the sealing body 4 and is provided with an impeller 7 at the bottom, and blades 15 are mounted on said impeller 7, whereby the shaft of the motor 1 drives the pump shaft 10 and thereby the blades of the impeller to rotate.

As clearly shown in fig. 1, the long pump shaft 10 is provided between the shaft of the motor and the impeller, which may cause many problems: for example, the cantilever beam structure of the long shaft results in poor vibration resistance of the pump body; the impeller may rub against the stationary impeller housing causing damage; the long shaft is easy to bend so as to cause the operation failure of the pump; and the coupling and long shaft result in substantial energy loss for power transmission; and so on. Furthermore, as shown in fig. 1, in order to make room for the long shaft, the inlet and outlet flow passages of the pump are also designed in the form of bent pipes, which obviously increases the difficulty and cost of the manufacturing process.

These drawbacks of the prior art described above can be at least partially solved by the technical solution of the present invention. According to the utility model, a vane pump is provided, which comprises a motor and a vane wheel component, wherein the motor comprises a stator and a rotor, the vane wheel component comprises a vane wheel framework and a vane wheel fixed on the vane wheel framework; the rotor of the motor is combined with the impeller framework, so that the rotor of the motor directly drives the impeller framework and correspondingly drives the impeller to rotate. Therefore, the technical scheme of the utility model the use of shaft coupling and pump shaft has been left out completely, has avoided a series of technical defect of the aforesaid that leads to by the pump shaft of overlength.

In particular, fig. 2 shows a side cross-sectional view of an embodiment of a vane pump according to the present invention. The vane pump is generally indicated by reference numeral 100, wherein the direction of fluid flow is from right to left as indicated by the arrows in the figure. Along the flow direction of the fluid, the vane pump 100 comprises an inlet housing 1 defining a fluid inlet, and an outlet housing 2 defining a fluid outlet. The fluid inlet and the fluid outlet are aligned in the direction of fluid flow, and therefore need not be designed as an elbow as in the prior art shown in fig. 1. A motor housing 3 is disposed between the inlet housing 1 and the outlet housing 2, and the motor housing 3 is sealed with the inlet housing 1 and the outlet housing 2 by seals, respectively, to ensure the overall sealing performance of the pump. The inlet housing 1, the outlet housing 2 and the motor housing 3 together form a housing of the impeller pump 100 for accommodating the motor and impeller assembly of the pump.

Specifically, the inner wall of the motor housing 3 is provided with an annular recessed cavity for accommodating and fixing the motor stator 4. Between the inlet housing 1 and the outlet housing 2, a hollow impeller frame 5 is provided, axially aligned with and in fluid communication with the fluid inlet and the fluid outlet, the impeller frame 5 here being in the form of a hollow cylinder. Thus, the interior of the impeller frame 5 forms a flow passage for fluid to flow from the fluid inlet to the fluid outlet. Compare with the technical scheme that sets up the pump shaft in the centre of runner usually among the prior art, the utility model discloses in the runner that is formed by the inside cavity of impeller skeleton is showing and has been increased the runner sectional area, has improved the pump sending flow.

The impeller frame 5 is respectively mounted in bearing assemblies at both ends in the axial direction, that is, a right bearing assembly 6 located upstream and a left bearing assembly 7 located downstream in the fluid flow direction. These bearing assemblies may be fixed in cavities provided on the inner wall of the motor housing 3 for supporting the rotation of the impeller frame 5.

The axial position corresponding to the motor stator 4 on the peripheral wall of the impeller framework 5 is integrally combined with the motor rotor 8, so that when the motor rotor 8 rotates under the action of the magnetic field of the motor stator 4, the impeller framework 5 can be driven to rotate together. On the inner peripheral wall of the impeller frame 5 in the form of a hollow cylinder, at least one stage impeller, in this embodiment a four-stage impeller, i.e., a first-stage impeller 9, a second-stage impeller 10, a third-stage impeller 11, and a four-stage impeller 12 in this order in the fluid flow direction, is fixed. Since the impellers are fixed on the impeller frame 5, when the motor rotor 8 drives the impeller frame 5 to rotate, the impellers are also driven to rotate simultaneously.

According to the present invention, the motor of the vane pump can advantageously be a brushless dc motor controlled by a printed circuit board. The motor has long service life, high reliability and high efficiency. Thus, the service life of the pump can be further increased, reducing the need for maintenance and replacement thereof.

Fig. 3 shows a schematic view of the rotor 8 of the motor in combination with the impeller skeleton 5 in the above-described embodiment of the impeller pump according to the invention. As an example, the motor rotor may be a four-pole magnet, such as an injection-molded magnet obtained by mixing magnetic powder into plastic particles and heating to a molten state followed by an injection molding operation. The impeller frame can be made of an aluminum profile by an extrusion molding process (similar to the plastic steel molding process), for example. In actual practice, the motor rotor may be fixedly coupled to the outer circumferential surface of the impeller frame through a secondary injection molding process (also referred to as an "over-molding" process).

Specifically, firstly, an impeller framework manufactured by an extrusion molding process is placed in a mold, then a molten mixture of magnetic powder and plastic particles is injected into a position for forming the motor rotor in the mold, after the mixture of the magnetic powder and the plastic particles is solidified and cooled to form the motor rotor, the parts are taken out of the mold, and the integrated assembly with the motor rotor stably combined on the outer peripheral surface of the impeller framework is obtained. The secondary injection molding process ensures the stable connection between the motor rotor and the impeller framework so that the impeller framework is directly driven to rotate by the motor rotor, thereby avoiding any energy loss in power transmission.

It will be appreciated by those skilled in the art that the motor rotor and the impeller frame may be combined by other processes or means than the secondary injection molding process, as long as a stable connection between the two is ensured to achieve integral rotation. For example, the two may be joined by a mechanical connection structure, such as a spline structure, an adhesive structure, a welding structure, or a combination thereof.

Fig. 4a shows a schematic view of a connection structure of a vane of an impeller and an impeller skeleton in the above-described embodiment of the vane pump according to the present invention. Fig. 4b shows an enlarged schematic view of the connection structure in fig. 4a (portion of circle "a" in fig. 4 a). As is clearly shown in these figures and in fig. 2 and 3, the inner peripheral surface of the impeller skeleton 5 is provided with circumferentially distributed and axially through-going groove runners, which may take the form of dovetail grooves 13. Because the impeller framework is formed by extrusion of aluminum profiles, the groove slideways can be integrally formed in the forming process of the impeller framework.

The individual blades making up the impeller may be powder metallurgical components, such as copper-based components. Corresponding to the shape and profile of these dovetail slots 13, the connection members between the individual blades of the wheel and the wheel skeleton may take the form of dovetails 14, as shown in FIG. 4 c. The figure shows that three dovetails 14 are provided at the root of the blade and that a threaded hole may be provided in the middle one of the dovetails 14, in correspondence with which a through circular hole passing radially through the circumferential wall of the wheel frame 5 is provided at a corresponding position on the wheel frame 5.

When installing the blade, push away the root of blade to the degree of depth department of settlement along the recess slide of impeller skeleton, then make countersunk screw 15 pass corresponding through-hole round hole from the outside of impeller skeleton 5 to twist and revolve the screw hole of the middle dovetail 14 of this blade, thereby firmly lock this blade on the internal perisporium of impeller skeleton. This connection limits axial movement of the vanes and eliminates radial clearances, thus avoiding the adverse effects of vibration, noise, etc. associated with axial and radial displacement of the vanes. After all the vanes are mounted in place on the impeller skeleton in the manner described above, all the grooved runners can be closed inside the impeller skeleton with glue to further secure the vanes, while avoiding adverse effects of the grooved runners on fluid flow.

In addition to the above-described mounting of the impeller blades to the impeller skeleton, other attachment means can of course also be envisaged by the person skilled in the art. For example, the impeller blades and the impeller frame are fixed together by welding, bonding, or the like.

The embodiment shown in fig. 2 shows an example of the application of the present invention to a multistage supercharged axial flow pump. In this example, a four-stage supercharging impeller is adopted, that is, the fluid flows out after passing through four-stage supercharging of the first-stage impeller 9, the second-stage impeller 10, the third-stage impeller 11 and the four-stage impeller 12 in order in the axial direction. The first-stage impeller comprises at least three blades, the number of the blades of the second-stage impeller is larger than or equal to that of the blades of the first-stage impeller, and the number of the blades of other stages of impellers is equal to that of the blades of the first-stage impeller. In addition, the axial distance between the impellers of each stage can be 0.78-1.1 times the inner diameter of the flow channel of the impeller framework.

By using the multi-stage supercharging impeller assembly which is axially distributed, the requirement of large flow and large pressure difference of the impeller pump can be met under the condition of not increasing the rotating speed of the motor. Moreover, the multistage supercharging impeller assembly can greatly reduce the size of the whole pump, has a simple structure and is convenient to assemble, so that the problem that the size of pumps with high flow and large pressure difference in the prior art is larger is solved.

It should be noted that the number of stages of impellers included in the vane pump and the number of vanes included in each stage of impellers and the axial distance between each stage of impellers according to the present invention are not limited to the embodiment of fig. 2, but may be adjusted according to specific application scenarios and pumping requirements. The specific contour shape of the blade can be adjusted according to actual needs.

Furthermore, although the embodiment of fig. 2 shows the present invention applied to a multistage supercharged axial flow pump, the present invention is equally applicable to other pumps driven by a motor, such as a water pump, an air pump, a circulating pump, a booster pump, etc. for an automobile. In particular, the present invention is particularly suited for use in automotive electronic fluid pumps.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited thereto. Various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is to be determined by the appended claims.

Claims (10)

1. A vane pump comprising a housing, and a motor and an impeller assembly accommodated in the housing, the motor including a stator and a rotor, characterized in that the impeller assembly includes an impeller and an impeller frame for carrying the impeller, the impeller frame being hollow inside to form a flow passage for a fluid, the impeller being fixed on an inner peripheral surface of the impeller frame, and the rotor of the motor being integrally coupled on an outer peripheral surface of the impeller frame.

2. The impeller pump according to claim 1, characterized in that the rotor of the motor is in the form of a ring-shaped magnet, the impeller frame is in the form of a hollow cylinder, and the rotor of the motor is arranged coaxially with the impeller frame on the outer circumferential surface of the impeller frame.

3. Impeller pump according to claim 1 or 2, characterized in that the impeller frame is provided with bearing assemblies at both ends for supporting the rotation of the impeller frame.

4. A vane pump as set forth in claim 1 or 2 wherein said housing includes an inlet housing defining a fluid inlet, an outlet housing defining a fluid outlet, and a motor housing located between said inlet housing and said outlet housing, said fluid inlet and said fluid outlet being aligned in the direction of fluid flow, and said vane skeleton being axially centered and in fluid communication with both said fluid inlet and said fluid outlet.

5. The impeller pump according to claim 1 or 2, wherein the rotor of the motor is fixedly coupled to the outer circumferential surface of the impeller frame by a secondary injection molding process.

6. A vane pump according to claim 1 or 2, wherein the vane is fixed to the inner peripheral surface of the vane frame by screwing, welding or adhesion.

7. The impeller pump according to claim 1 or 2, wherein a dovetail is provided at a root of each blade of the impeller, dovetail grooves are provided on an inner peripheral surface of the impeller frame, the dovetail grooves are circumferentially distributed and axially penetrate, and the dovetail grooves are engaged with each other and fixed together by screws.

8. Impeller pump according to claim 1 or 2, characterized in that the impeller assembly is a multistage booster impeller assembly comprising at least two stages of impellers distributed in axial direction.

9. The impeller pump of claim 8, wherein the one-stage impeller in the direction of fluid flow comprises at least three blades, and wherein the subsequent-stage impeller comprises a number of blades equal to or greater than the number of blades of the previous-stage impeller.

10. Vane pump according to claim 1 or 2, characterized in that the motor is a printed circuit board controlled brushless dc motor.

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