JPH0318688A - Westco type pump mechanism - Google Patents

Abstract

PURPOSE:To improve the efficiency of pumping and lower a pump noise and increase the quantity of flow, by making a constitution so that the directions of an inlet hole and an outlet hole may become acute-angled against the flow directions of fluid at respective opposing flow passages. CONSTITUTION:At a pump portion 10, the directions of an inlet hole 25, a connection hole and an outlet hole 30 are formed so as to make the angle of an acute angle against opposing 1st and 2nd flow passages 15, 16. Fluid flows into the 1st flow passage 15 and the 2nd flow passage 16 in an acute angle shape, and also, flows out in an acute angle shape, so the degree of the conversion of flowing at the inlet hole 25, the connection hole and the outlet hole 30 becomes small. Thus, the occurrence of an eddy at the conversion portion of flowing is restrained, so the improvement of a pump efficiency, the lowering of a pump noise and the increase of a flow quantity can be attained.

Description

[Detailed description of the invention] (Industrial application field) This invention is unique to the Wesco type bomb mechanism! I'm sorry.

(Prior Art) Generally, a Wesco type pump mechanism is rotatably driven and includes at least one impeller having a plurality of blade grooves on the outer periphery;
a pump casing that surrounds each of the impellers around the blade grooves and forms a circumferential flow path between the impeller and the blade grooves; It has an inlet hole and an outlet hole arranged at appropriate intervals in the circumferential direction,
For example, in a multi-stage type with multiple impellers, the fluid that flows in from the inlet hole of the first stage passes through the circumferential flow path of the corresponding impeller and is pressurized, and then the fluid enters the outlet hole of the first stage, that is, the inlet of the second stage. Through the holes, the fluid passes through the circumferential flow path of the impellers facing each other in the same way. The liquids are pressurized one after another and are discharged from the exit hole of the final stage.

In this type of Wesco-type bomb mechanism (conventionally, the inlet hole and outlet hole are formed perpendicularly to the surface of the impeller, so the fluid flows at a right angle at each entrance and exit part of the U flow path). Ta.

(Problem to be Solved by the Invention) In the conventional Wesco type pump mechanism, as mentioned above, the fluid flows westward at right angles at each inlet and outlet of the flow path.
As shown in the figure, a vortex E-E is generated at the flow conversion part, which deteriorates the bomb efficiency and furthermore causes the problem of noise. In addition, P in Fig. 12 is the flow path in the previous stage, and Q
indicates the flow path of the next stage, and R indicates the outlet hole of the flow path P of the previous stage and the inlet hole of the flow path Q of the next stage.

(Means for Solving the Problems) In order to solve the problems of the prior art described above, the Wesco-type bomb mechanism of the present invention is rotatably driven, and includes at least one impeller having a plurality of blade grooves on the outer periphery, and each of the impellers. a pump casing that surrounds the entire circumference of the blade to form a circumferential passage between the blade groove and the blade groove; A Wesco-type bomb mechanism having an inlet hole and an outlet hole arranged at appropriate intervals in the circumferential direction, the direction of fluid flow in the flow path in which the directions of the inlet hole and the outlet hole respectively correspond to each other. It is constructed so that it forms an acute angle.

(Function) In the Wesco type bomb mechanism of the present invention, the fluid flows into each channel at an acute angle from the inlet hole and flows out from the outlet hole at an acute angle, so the degree of flow conversion at the inlet hole and the outlet hole is small. This suppresses the generation of vortices in the flow converter.

(Joan Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an electric fuel bomb using a Wesco type bomb, which is used to supply fuel to a vehicle engine.

In the figure, a motor section 2, only a portion of which is shown, is provided inside a cylindrical casing 1. In the illustrated embodiment, the motor section 2 has a rotor 3 equipped with a magnet on its outer circumference.
and a stator 4 attached to the inner peripheral surface of the casing 1. The L coater 3 is rotated coaxially with the casing 1 by energizing the coil 6 of the C stator 4 through terminals 5, 5 provided on a cover (not shown) attached to the upper end of the casing 1. are related. It should be noted that the configuration of such a motor section 2 is well known, and detailed explanation will be omitted. Further, motor parts 2 and C of other types than those shown in the drawings can also be used. [Rotor 3 of rotor section 2
The lower part of the shaft 7 is attached to a bong cover 8 (pump casing 14 described later) which is caulked to the lower end of the casing 1.
The shaft 7 extends further downward through the bearing 9 through the shell.

Next, to explain the configuration of the bomb section 10 driven by the motor section 2, the pump section 10 is of a Wesco type.
A disk-shaped first impeller 11 and a second impeller 12 are attached to the lower end of the shaft 7 at right angles to the shaft 7. 1st impeller 11
The second impeller 12 has the same structure and is provided with a plurality of blade grooves 13 on the outer periphery of the upper and lower surfaces. Here, the lower end of the shaft 7 has a D-shaped cross section to the right, and the first impeller 11
The second impeller 12 has a corresponding D-shaped hole in the center and is loosely fitted into the shaft 7 a3, and the first impeller 11
The second impeller 12 can follow the rotation of the shaft 7 and can move in the axial direction.

14 is a first flow passage 15 in the circumferential direction surrounding the first impeller 11 and the second impeller 12 and around these blade grooves 13.
The pump body 17 and the first spacer 18 are connected to each other from the bottom in the figure.
, center plate 19. It consists of a second spacer 20 and the above-described pump force bar 8, which are superimposed on each other by a plurality of screws 21 (only one tree is shown in the figure) screwed into the pump force bar 8. is fixed.

Here, as shown in FIGS. 2 and 3, the pump body 17 and the center plate 19 are provided with a flow path 23 which forms a wall crest in the vertical direction of the first flow path 15, respectively, as shown in FIGS. 2 and 3.
．． 24, and the first spacer 18 is connected to the first flow path 15.
It forms the radial wall surface of. Also bomb body 1
7 has an inlet hole 25 to the first flow path 15 as shown in FIGS. 1 and 4, and the center plate 19 has an outlet hole 25 from the first flow path 15 as shown in FIG. Communication holes 26 that also serve as inlet holes to the two flow paths 16 are provided respectively, and as shown in FIGS. A partition wall 27 is formed between the hole 26 and the partition wall 27 . As shown in FIGS. 2 and 3, the communication hole 26 is provided at a position radially outward from the outer circumferential edge of the first impeller 11, and the first flow path 15 is provided approximately tangentially on the downstream side. Extend and communicate hole 2
It is connected to 6. Therefore, the fluid such as fuel pumped up through the inlet hole 25 gradually leaves the blade groove 13 on the downstream side and collides with the partition wall 27 while the spiral vortex generated by the blade groove 13 is relaxed. The noise generated when the pump collides with the pump is reduced, and pump efficiency is improved.

Further, the center plate 19 and the pump force bar 8 are provided with the second flow path 1 on opposite sides as shown in FIGS. 6 and 7.
Channel grooves 28.2 forming vertical wall surfaces of 6, respectively.
9, and the second spacer 20 forms a wall surface of the second flow path 16 in the radial direction. In addition, the bomb cover 8 has an outlet hole 3 for the second flow path 16 as shown in FIGS. 1 and 8.
0, and as shown in FIGS. 6 and 7, a partition wall 31 is formed in the second spacer 20 to partition the second flow path 16 between the communication hole 26 and the outlet hole 30. . Further, similarly to the above, the outlet hole 30 is provided at a position radially outward from the outer peripheral edge of the second impeller 12, and the second flow path 16 extends substantially tangentially on the F flow side.
connected to. Therefore, the fluid such as fuel pumped up from the through hole 26 gradually separates from the blade groove 13 on the downstream side of the second flow path 16, resulting in similar noise suppression and pump efficiency improvement effects.

Note that, after the fuel coming out of the outlet hole 30 enters the casing 1, it is discharged from the discharge port 32 provided in the cover at the upper end.

Next, returning to FIG. 4, FIG. 5, and FIG. 8, as shown in the same figure, the inlet hole 25 has an acute angle θ in the vertical direction with respect to the flow direction of the first flow path 1-5 shown by arrow A. Similarly, the communication hole 26 is vertically arranged at an angle θ with respect to the flow direction A of the first flow path 15 and the flow h direction of the second flow path 16 indicated by the arrow B.
The outlet hole 30 is also formed at an angle θ in the vertical direction with respect to the flow direction B of the second flow path 16.

Further, in this embodiment, the first impeller 11 and the second younger impeller 12 are parallel, and therefore the flow direction A of the first flow path 15 and the flow direction B of the second flow path 16 are also parallel. .

The inlet hole 25, the communication hole 26, and the outlet hole 30 extend substantially tangentially to the corresponding first flow path 15 and second flow path 16 in plan view. Since the four sides of the inlet hole 25, communication hole 26, and outlet hole 30 are formed at an acute angle θ with respect to the corresponding first flow path 15 and second flow path 16, the fluid flows through the first flow path 15 and the second flow path 16. Since the two flow paths 16 enter at an acute angle and exit at an acute angle, the degree of flow conversion at the inlet hole 25, communication hole 26, and outlet hole 30 is reduced, and the generation of vortices at the flow conversion portion is suppressed. be done.

Therefore, as described above, the first flow path 15 and the second flow path 1
In addition to the noise reduction effect by letting the downstream side of the impeller 6 escape radially outward from the corresponding first impeller 11 and second impeller 12, the inlet hole 25, the communication hole 26, and the outlet hole 30
Since the flow resistance due to the vortices generated in the cylinder is reduced, the flow collapse is increased and the bomb efficiency is improved, and the reduction in the vortices has the effect of reducing noise.

Such effects will be explained below with reference to FIGS. 9, 10, and 11.

Figure 9 shows the angle θ, noise (dB), and bomb efficiency (%).
This is a characteristic diagram showing the relationship between the angle θ and
By setting the angle at an acute angle, the bomb noise is definitely reduced and the bomb efficiency is definitely increased. The range in which the effect is noticeable is 10°≦θ≦60°, and the maximum bomb noise reduction and bomb efficiency improvement are obtained near θ=30°, so it is ultimately set at θ-30±10'. is optimal.

Note that the bomb efficiency is calculated as follows: bomb efficiency = discharge pressure x flow rate/input power.

Figure 10 shows the impeller rotation speed (r
om) - Bump efficiency (%) Characteristic diagram, conventional θ = 90
The broken line shows the characteristics when the angle is 350 Orpm, and as shown in the figure, higher efficiency than the conventional one can be obtained at 350 Orpm or more.

Similarly, Fig. 11 is a characteristic diagram of inhaler rotation speed (rpm)-5m1M (j/h) when θ-30'' is set, and the characteristic when the conventional θ-90' is set is shown by a broken line. As shown in the figure, at 300 rpm or more, proportionally greater flow speed can be obtained than in the conventional case.

Note that in the above embodiments, the directions of the inlet hole 25, the communication hole 26, and the outlet hole 30 were formed at the same acute angle θ with respect to the corresponding first flow path 15 and second flow path 16. If the angle is an acute angle, it is also possible to set different values for the entrance hole 25, the communication hole 26, and the exit hole 30, respectively.

(Effects) In the Wesco-type pump mechanism of the present invention, the degree of flow conversion at the inlet hole and the outlet hole is reduced, and the generation of vortices at the flow conversion portion is suppressed, thereby improving bomb efficiency, reducing pump noise, and reducing pump noise. It has the advantage of increasing the amount of

[Brief explanation of the drawing]

Figures 1 to 11 show an embodiment of the present invention.
! Figure 1 is a Wesco-shaped bong! FIG. 2 is a sectional view taken along the line M-m in FIG.
Figure 3 is a sectional view taken along line m--■ in Figure 1, and Figure 4 is a cross-sectional view along line r in Figure 2.
FIG. 5 is a cross-sectional view taken along the V-IV line of the bomb body only, FIG. 5 is a cross-sectional view taken along the V-V line of FIG. , Figure 7 is a cross-sectional view taken along ■-■ [j of Figure 1, and Figure 8 is a
A diagram showing the cross section of the figure along the ■-■ line with respect to only the pump power bar,
Figure 9 shows the angle θ of the inlet hole, communication hole, and outlet hole of the pump shown in Figure 1 with respect to the corresponding flow path, and
B) and the characteristic diagram showing the relationship between pump efficiency (%), Figure 10 shows the impeller rotation speed (rp
m) Bomb efficiency (%) characteristic diagram, Figure 11 shows θ
= 30゛, the impeller rotational speed (ROM) first flow metallurgy (j!/i) characteristic diagram, Figure 12 is an iJ explanatory diagram showing the state of flow at the inlet and outlet of fluid in a conventional Wesco type bomb. . Fig. 8 10... Bomb part 14... Pump casing 11... First impeller 12... Second impeller 13... Vane groove 15... First flow path 16... Second flow Route 25...Artificial hole 26...Communication hole 30...Exit hole E

Claims (1)

[Claims] At least one impeller that is rotationally driven and has a plurality of blade grooves on its outer periphery, and a pump casing that surrounds each of the impellers around the blade grooves to form a circumferential flow path between the impeller and the blade grooves. and a Wesco-type pump mechanism having an inlet hole and an outlet hole provided above and below the pump casing in correspondence with each of the flow paths, and arranged at appropriate intervals in the circumferential direction from each other, A Wesco type pump mechanism, characterized in that the directions of the inlet hole and the outlet hole are configured to form an acute angle with respect to the fluid flow direction in the corresponding channel.