KR101405775B1 - a method for shaping of vane pump housing - Google Patents

Abstract

The present invention relates to a housing shape of a vane pump. More specifically, the present invention relates to a method for shaping the interior of a housing to match the inner contour of the housing with the trajectory drawn by both ends of a vane with a predetermined length while the vane which is slidably-coupled to contact the inner surface of the housing and rotate in a rotor which eccentrically rotates from the center of the housing by a predetermined distance.

Description

[0001] The present invention relates to a method for determining a housing shape of a vane pump,

[0001] The present invention relates to a housing shape of a vane pump, and more particularly, to a housing shape of a vane pump, in which a vane slidably engaged in a rotor rotating in a constant eccentricity with the center of the housing rotates in contact with the inner surface of the housing, And the shape of the housing is determined such that the locus drawn by both ends of the vane coincides with the inner contour of the housing.

1, a conventional vane pump includes a suction port 110 for sucking fluid from the outside, a housing 100 having a discharge port 120 and a volume chamber 130 for discharging the pumped fluid, A rotor (200) eccentrically disposed in the volume chamber and rotating; A vane 300 pinched in the vane groove 210 formed along the radial direction of the rotor and supported by the elastic member; And an elastic member (310) elastically supporting the end of the vane such that the end of the vane is in close contact with the inner surface of the volume chamber, characterized in that when the end of the vane supported by the elastic member is in sliding contact with the inner surface of the volume chamber So that the fluid is sucked or discharged.

The vane 300 of the conventional vane pump has two vanes 300 A and 300 B at both ends thereof coupled to the vane groove 210 and connected to the elastic member 310 at an intermediate portion thereof. The entire length of the vane is increased or decreased so that the vane is rotated closely in contact with the inner surface of the housing. The reason why the vane structure in this conventional pump divides the vane into two and connects the middle with the elastic member will be described below.

 FIG. 2 is a view showing a circumferential circle 400 of a rotor and a housing inner surface contour line 500 of a vane pump of the present invention. The O marked in red indicates the center of rotation of the rotor, which is eccentrically offset from the virtual center of the housing and several straight lines passing through the center O indicate vanes at any position.

If the vane is in the form of a rigid body such as the vane 300 shown in FIG. 3 but not in the middle connected to the elastic member as shown in FIG. 1, the length of all straight lines passing through the center O in FIG. If the length of the vane is L, the length of the straight line should be constant as L if the vane is vertically positioned, horizontally positioned, or tilted at any position.

However, since the center of the rotor is eccentric with the center of the housing (the volume of the volume chamber is changed by the eccentricity, the compression action is performed). The locus of the ends of the vane at both ends of the rotor is not rounded. However, in actual processing, the inner contour 500 of the housing is processed in a circle in FIG. 2 because the circular shape is the simplest to process and easy to assemble. When the inner contour of the housing becomes a circular circle, the radius of the circle is shorter than the vane at some position and longer than the vane at some position.

Conventional vane pumps with a circular inner shape of the housing are one solution to this problem. In order to make the length of the vane variable, it is necessary to separate the vane into two pieces and insert the elastic member in the middle, To fit the outline of the inner surface of the housing.

However, if the vane body is divided into two and the elastic member is inserted in the middle to form the vane, the working fluid will be impregnated in the middle of the pumping process, and in the case of the fluid having high viscosity such as sludge, This causes the vane to fail to function properly, causing serious problems that prevent the vane pump from operating. Further, due to the elastic force of the elastic member, the vane continues to push on the inner surface of the housing, and the abrasion phenomenon caused by the vane continues to occur, thereby causing a serious problem in the durability of the pump. If the vane is integrally formed to solve such a problem, there arises a problem that the inner surface shape of the housing does not coincide with the trajectory of the vane moving as described above.

One of the conventional pumps proposed to solve the above problems among the pumps having one vane as a rigid body attempts to solve the problem by manufacturing the inner contour of the housing as an ellipse instead of a circle, but as a form called an ellipse, , The two ends of the vane still do not coincide with the exact shape to be drawn so that there is a gap between the vane and the housing at some position while the vane is rotating and the length of the vane at any position is longer than the diameter of the housing, And the phenomenon of pinching the housing occurs.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for determining the outline of the inner surface of the housing which exactly matches the rotational locus of the vane at all positions when the rotor rotates.

The present invention provides the following method for solving the above problems. Determining a radius (R) of the rotor according to the capacity of the pump; Determining a length (L) of the vane according to the compression performance of the pump; When the vane is rotated in the clockwise direction, when the angle (?) Between the vertical axis and the vane changes from 0 to 180 degrees, the tip of the vane starts to move from the point ① to the point ⑤, (1) to return to the point).

In the present invention, the rotor is eccentrically formed with the inner surface of the housing, and the vane is rotated so that the trajectory drawn by the vane in the vane pump using the integral vane exactly matches the contour of the inner surface of the housing, The length of the diagonal line of the housing centered on the center O of the rotor is equal to the length of the vane at that point so that no friction occurs between the vane end and the inner surface of the housing, The accurate airtightness of the volumetric chamber can be ensured and reliable pumping function can be performed, and wear is not caused, so that the durability of the pump is remarkably improved.

1 is a view of a conventional vane pump in which the center of the vane is connected to an elastic member.
FIG. 2 is a view showing the outer circumference circle of the rotor and the inner contour of the housing. FIG.
3 is a view showing a vane pump made of one rigid body of a vane.

Specific details for carrying out the present invention are as follows. First, determine the capacity of the pump according to the purpose and application of the pump and determine the size (radius R) of the rotor accordingly. Once the size of the rotor is determined, the compression performance must be determined, which is determined by the total length (L) of the vane. As d becomes larger, the volume space 130, i.e., the compression space becomes larger and the compression performance becomes larger. Once the radius R of the rotor and the length L of the vane are determined, the outline of the inner surface of the housing is determined as follows (see Figure 4)

here,

R : Radius of the rotor

L : Length of the vane

2d : The difference between the total length of the vane and the rotor diameter. Or the difference between the vertical width of the inner surface of the housing and the rotor diameter (2d = L -2R) when the vane is in the vertical position (in line with the y-axis)

θ : The angle between the positive y-axis and the vane when the vane rotates clockwise

 0 DEG ≤

r : Distance between the point where the vane end is located (point P in FIG. 4) and the center of the rotor when the vane is rotated by?

When

r should be r = R when θ is 0 and r = R + 2d when θ is 180.

Since r increases linearly from the initial value R to the final value R + 2d from 0 to 180,

The formula of r = R + (d / 90) * θ (1) is made at θ . (See Fig. 5)

If the coordinate values of x and y in the x-y coordinate system of the point P based on the r obtained in the above expression (1)

      x coordinate = r * sin? = {R + (d / 90) *?} sin?

y coordinate = r * cos? = {R + (d / 90) *?)} cos?

Thus, when θ increases by 1 degree from 0 ° to 180 °, you can obtain the x and y coordinates of each point and connect them to obtain the outline that exactly matches the trajectory drawn by moving the end of the vane. Also, the shape corresponding to the other half from 180 to 360 degrees can be obtained by symmetrically processing the contour line from 0 to 180 about the y-axis. In actual machining, considering the machining tolerance of the tool, there is no point in dividing 1 degree, and when the θ is increased by 2 degrees, the x and y coordinates are obtained and the inner contour can be obtained even if the inner surface of the housing is processed with the coordinates.

When θ is 90, that is, when P comes to ⑤ in Fig. 2, θ = 90 is substituted for x = R + d and y = 0 and the opposite Q is at ⑦ The length of the two points is 2R + 2d, which corresponds to the total length of the vane.

R = (d / 90) * 30 = R + d / 3 when the angle θ is 30 degrees, that is, when the ends of the vanes are located at A and B in FIG. Length is symmetrical to OC

OC = R + (d / 90) * 150 = R + 5d / 3,

Therefore, AB = OA + OB = OA + OC = R + d / 3 + R + 5d / 3 = 2R + 2d.

100: housing 110: inlet
120: discharge port 130: volumetric chamber
200: rotor 210: groove for vane coupling
300: Vane 300A: One piece of detachable vane
300B: Another piece of detachable vane 310: Elastic member
400: outer circle of the rotor 500: locus of the inner surface of the housing

Claims (2)

Determining a radius (R) of the rotor according to the capacity of the pump;
Determining the length L of the vane 300 according to the compressive performance of the pump;
When the vane 300 rotates in the clockwise direction, when the angle? Formed by the vertical axis (positive y axis) and the vane 300 changes from 0 degrees to 180 degrees, a trajectory in which the tip of the vane is drawn Steps to Obtain:
Symmetrically moving the drawn locus of the vane with the locus and the locus about the y-axis, and determining a shape represented by a line connecting the locus and the locus as the inner shape of the pump housing; Wherein the vane pump has an integral vane.
2. The method according to claim 1, wherein the x and y coordinates of the locus in the step of obtaining the trajectory of drawing the leading end of the vane are expressed by the following equations, respectively.
x = {R + (d / 90) *?} sin?
y = {R + (d / 90) *?} * cos?

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