Low flow resistance valve plate

Abstract

The present invention belongs to the technical field of plunger pumps, and in particular, relates to a low-resistance distribution plate. In view of the problem that the flow resistance of the hydraulic medium caused by the reinforcing ribs in the prior art is relatively large, the present invention provides a low-resistance distribution plate, including a distribution plate body, the distribution plate body is provided with a hydraulic medium suction hole and a hydraulic medium discharge hole that penetrate the distribution plate body, the hydraulic medium located on the outside of the distribution plate body flows to the inside of the distribution plate body through the hydraulic medium suction hole, and the hydraulic medium located on the inside of the distribution plate body flows to the outside of the distribution plate body through the hydraulic medium discharge hole, and the hydraulic medium discharge hole is also provided with a reinforcing rib fixedly connected to the distribution plate body, and the cross-sectional area of ​​the reinforcing rib near one end of the inner side of the distribution plate body is smaller than the cross-sectional area of ​​the reinforcing rib at the maximum cross-sectional area. The present invention reduces the cross-sectional area of ​​the reinforcing rib near one end of the inner side of the distribution plate body, thereby ensuring the strength of the distribution plate body and reducing the flow resistance of the hydraulic medium caused by the reinforcing rib.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to a low flow resistance distribution plate. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to absorb and discharge the hydraulic medium. There is a waist-shaped hole on one side of the distribution plate for sucking in the hydraulic medium, and a waist-shaped hole on the other side for discharging the hydraulic medium. In the use environment where the hydraulic medium pressure is high, in order to prevent the waist-shaped hole on the high-pressure side from deforming and destroying the sealing performance of the spherical sealing belt, reinforcing ribs are usually provided on the high-pressure side to enhance the strength.

[0003] However, after the reinforcement ribs are set, the reinforcement ribs will hinder the flow of hydraulic medium. Take the 200cc-40cc displacement self-priming axial inclined plate piston pump as an example. Its speed range is 1800rpm-3000rpm, and the cylinder body rotates 30-50 times per second. On the distribution plate with two reinforcement ribs, 9 plungers will meet 2 reinforcement ribs 18 times per rotation. The flow of hydraulic medium will be hindered 540-900 times per second. The flow resistance caused by such a high-frequency phenomenon cannot be ignored.

[0004] For example, a Chinese utility model patent discloses an anti-cavitation distribution plate [application number: 201220016858.3]. The utility model patent includes a distribution plate body, on which a low-pressure oil suction area and a high-pressure oil discharge area are provided. The low-pressure oil suction area and the high-pressure oil discharge area are isolated from each other and symmetrical with respect to the horizontal axis of the distribution plate body; the characteristic is that a first hole and a second hole are provided between the high-pressure oil discharge area and the low-pressure oil suction area, and the first hole and the second hole are respectively connected to the shell cavity of the plunger pump. The first hole is located on the side close to the low-pressure oil suction area, and the second hole is located on the side close to the high-pressure oil discharge area, and the aperture of the first hole is larger than the aperture of the second hole. The low-pressure oil suction area is an arc-shaped groove, and the high-pressure oil discharge area is composed of multiple waist-shaped grooves.

[0005] The utility model has the advantage of preventing cavitation from occurring in low-pressure areas, but it still has the above-mentioned problems. Summary of the invention

[0006] The object of the present invention is to provide a low flow resistance valve plate which can reduce the flow resistance of hydraulic medium in view of the above problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A low flow resistance distribution plate comprises a distribution plate body, on which a hydraulic medium suction hole and a hydraulic medium discharge hole which penetrate the distribution plate body are provided, and the reinforcing rib can be divided into an inlet part facing the hydraulic medium discharge flow direction and an outlet part for hydraulic medium discharge, and the cross-sectional area of ​​the inlet part is smaller than the cross-sectional area of ​​the outlet part.

[0009] In the above-mentioned low flow resistance distribution plate, the reinforcing rib includes a reinforcing portion and a drag reducing portion, the drag reducing portion is located near the inlet facing the hydraulic medium discharge flow direction, and the cross-sectional area of ​​the drag reducing portion gradually decreases from the inlet portion to the outlet portion.

[0010] In the above-mentioned low flow resistance distribution plate, the surface of the drag reduction portion is a curved surface or the surface of the drag reduction portion is composed of a plurality of planes or curved surfaces connected in sequence.

[0011] In the above-mentioned low flow resistance distribution plate, the portion of the cross section of the reinforcing rib facing the direction of the hydraulic medium discharge flow includes a first combined edge and a second combined edge that are connected to each other. If the plane parallel to the hydraulic medium inflow direction is defined as a diversion plane, the first combined edge is on one side of the plane, and the second combined edge is on the other side. The reference line passes through the connection point of the first combined edge and the second combined edge, and the first rectangular orientation boundary box of the first combined edge and the second rectangular orientation boundary box of the second combined edge are respectively located on both sides of the diversion plane. (Orientation Bounding Box is the smallest boundary box that contains a certain geometric shape)

[0012] In the above-mentioned low flow resistance distribution plate, the angle θ between the length of the boundary box in the first direction and the flow dividing surface is 5-85 degrees. The smaller the angle θ is, the smaller the resistance of the reinforcing rib to the flow is. However, as the angle θ decreases, the cross-sectional area of ​​the reinforcing rib also decreases, and the reinforcing effect of the reinforcing rib is weakened. When implementing the present invention, it is necessary to determine the angle θ on the basis of weighing the strength of the reinforcing rib and the flow resistance reduction effect.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. The present invention reduces the cross-sectional area of ​​the reinforcing rib facing the discharge flow direction of the hydraulic medium, thereby reducing the obstruction of the reinforcing rib to the hydraulic medium while ensuring the strength of the distribution plate body.

[0015] 2. The present invention has obtained the most suitable shape structure of the reinforcing rib through long-term experiments. Under this shape structure, while ensuring the reinforcement strength, the obstruction of the reinforcing rib to the flow of hydraulic medium is reduced to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 is the cross-sectional view of the reinforcement;

[0018] Figure 3 It is a simulation calculation diagram of flow resistance at the reinforcement rib of the prior art;

[0019] Figure 4 yes Figure 3 Enlarged view of the middle reinforcement rib;

[0020] Figure 5 It is a simulation calculation diagram of flow resistance at the reinforcing rib of the present invention;

[0021] Figure 6 yes Figure 5 Enlarged view of the middle reinforcement rib;

[0022] Figure 7 It is a simulation calculation diagram of pressure change at the reinforcement rib of the prior art;

[0023] Figure 8 It is a simulation calculation diagram of pressure change at the reinforcing rib of the present invention;

[0024] Fig. 9 It is a simulation calculation diagram of turbulent viscosity at the reinforcement rib of the prior art;

[0025] Fig.10 This is a simulation calculation diagram of turbulent viscosity at the reinforcing rib of the present invention;

[0026] In the figure: a distribution plate body 1, a hydraulic medium suction hole 2, a hydraulic medium discharge hole 3, a reinforcing rib 4, a first combined edge 5, a second combined edge 6, a reference line 7, a first rectangular boundary frame 8, a second rectangular boundary frame 9, a reinforcing portion 41, and a drag reduction portion 42. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] This embodiment provides a low flow resistance distribution plate, such as Figure 1 As shown, it includes a distribution plate body 1, and the distribution plate body 1 is provided with a hydraulic medium suction hole 2 and a hydraulic medium discharge hole 3 which penetrate the distribution plate body 1. When in use, the hydraulic medium flows in through the suction hole 2 of the distribution plate body 1, and the sucked hydraulic medium rotates to the discharge position with the cylinder hole, and the hydraulic medium is discharged through the discharge hole 3. The hydraulic medium discharge hole 3 is also provided with a reinforcing rib 4, and the cross-sectional area of ​​the reinforcing rib 4 facing the hydraulic medium discharge flow direction is smaller than the cross-sectional area of ​​the reinforcing rib 4 at the hydraulic medium flow outlet.

[0030] Most of the reinforcing ribs used in the prior art are uniformly shaped with equal widths at the top and bottom. Therefore, simply reducing the width of the reinforcing ribs to reduce the flow resistance cannot ensure that the reinforcing ribs provide a certain reinforcing strength to the distribution plate body 1. The present invention reduces the cross-sectional area of ​​the reinforcing ribs 4 facing the discharge flow direction of the hydraulic medium, thereby ensuring that the reinforcing ribs 4 provide a certain reinforcing strength to the distribution plate body 1 while reducing the obstruction of the reinforcing ribs 4 to the hydraulic medium.

[0031] Combination Figure 1 and Figure 2 As shown, the reinforcing rib 4 includes a reinforcing portion 41 and a drag reducing portion 42, wherein the drag reducing portion 42 faces the hydraulic medium discharge flow direction, the reinforcing portion 41 is located at the hydraulic medium outflow, and the cross-sectional area of ​​the drag reducing portion 42 gradually decreases toward the reinforcing portion 41. The drag reducing portion 42, i.e., the portion of the reinforcing rib 4 facing the hydraulic medium discharge flow direction, adopts a structure with a gradually decreasing width, which can further reduce the flow resistance of the hydraulic medium at this location.

[0032] Preferably, the surface of the drag reduction portion 42 is a cambered surface or the surface of the drag reduction portion 42 is composed of a plurality of planes or curved surfaces connected in sequence. The surface of the drag reduction portion 42 is preferably a cambered surface. Experiments have shown that when the surface of the drag reduction portion 42 is a cambered surface, that is, when the reinforcing rib 4 is chamfered in an arc shape, the flow resistance reduction effect of the hydraulic medium is most obvious. However, as an alternative, a plurality of planes or curved surfaces connected in sequence can be used to replace the entire arc surface, which can also achieve a similar effect.

[0033] Through long-term experiments, the present invention has obtained the most suitable shape structure of the reinforcing rib. Under this shape structure, while ensuring the strength of the reinforcing rib, the reinforcing rib has the least obstruction to the flow of hydraulic medium. The specific structure is shown in the cross-sectional shape of the reinforcing rib 4, combined with Figure 1 and Figure 2 As shown, the edge of the cross section of the reinforcing rib 4 close to the inner side of the distribution plate body 1 includes a first combined edge 5 and a second combined edge 6 connected to each other, and also includes a diverter surface 7 parallel to the outflow direction of the hydraulic medium, the diverter surface 7 passes through the connection point of the first combined edge 5 and the second combined edge 6, and the first rectangular boundary frame 8 of the first combined edge 5 and the second rectangular boundary frame 9 of the second combined edge 6 are respectively located on both sides of the reference line 7. Preferably, the angle θ between the major axis of the first rectangular boundary frame 8 and the reference line 7 is 5-85 degrees. Under preferred conditions, the reinforcing rib 4 can further reduce the flow resistance to the hydraulic medium.

[0034] The first rectangular bounding box 8 is a cross section of a directional bounding box (Orientation Bounding Box, which is a minimum bounding box containing a certain geometric shape) on one side of the reinforcing rib 4. The calculation method of the directional bounding box can refer to relevant geometry books.

[0035] Step 1: A certain geometric shape can be discretized into a point group (a plane or a curved surface can generate a certain number of point groups)

[0036] Step 2: The principal axis X of the distribution of these point groups can be calculated using the least squares method (X is not necessarily parallel to the coordinate axis of the global coordinate system)

[0037] Step 3: Find a box in the local coordinate system of the point group distribution axis, which contains the entire point group.

[0038] Step 4: Calculate the Y axis in the local coordinate system.

[0039] That is, according to the discrete point group, the least squares method is used to first calculate the vector of the X-axis, convert it to a unit vector, and then find a vector perpendicular to the X-axis, which is the direction of the Y-axis, and convert it into a unit vector.

[0040] The second rectangular boundary box 9 is a cross section of the boundary box in the surface direction of the other side of the reinforcing rib 4. The dividing line between the two sides displayed on the cross section is the reference line 7.

[0041] Application Example 1

[0042] Take the low flow resistance distribution plate provided in Example 1, and then take a distribution plate with the same bottom shape and width of the reinforcement rib as the low flow resistance distribution plate, but the reinforcement rib itself is set with the same width. Computer simulation calculations are performed with the shapes of the low flow resistance distribution plate box and the distribution plate, and the results are as follows: Figure 3-10 shown.

[0043] contrast Figure 3-4 and Figure 5-6 , Figure 7 and Figure 8 , Fig. 9 and Fig.10 It can be seen that when the hydraulic medium flows to the reinforcement ribs of the distribution plate, there are violent vortices on the reinforcement ribs, the pressure loss is large, the flow resistance is large, and the turbulent viscosity is large. When the hydraulic medium flows to the reinforcement ribs of the low-resistance distribution plate, there are no vortices on the reinforcement ribs, the pressure loss is small, the flow resistance is very small, and the turbulent viscosity is small. Therefore, the low-resistance distribution plate provided by the present invention greatly reduces the flow resistance of the reinforcement ribs to the hydraulic medium compared to the distribution plate in the prior art, so the intended purpose of the present invention is achieved.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0045] Although the terms such as valve plate body 1, hydraulic medium suction hole 2, hydraulic medium discharge hole 3, reinforcing rib 4, first combined edge 5, second combined edge 6, reference line 7, first rectangular boundary frame 8, second rectangular boundary frame 9, reinforcing portion 41, drag reduction portion 42 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A low flow resistance valve plate, comprising a valve plate body (1), the valve plate body (1) being provided with a hydraulic medium suction hole (2) and a hydraulic medium discharge hole (3) penetrating the valve plate body (1), the hydraulic medium discharge hole (3) being further provided with a reinforcing rib (4) fixedly connected to the valve plate body (1), characterized in that: The cross-sectional area of ​​the portion of the reinforcing rib (4) facing the outflow direction of the hydraulic medium is smaller than the cross-sectional area of ​​the reinforcing rib (4) at the outflow position of the hydraulic medium; The reinforcing rib (4) comprises a reinforcing portion (41) and a drag reducing portion (42) which are fixedly connected, the drag reducing portion (42) being closer to the inner side of the distributor plate body (1) than the reinforcing portion (41), and the cross-sectional area of ​​the drag reducing portion (42) gradually decreases from one end close to the reinforcing portion (41) to the other end; The surface of the drag reduction portion (42) is a curved surface, or the surface of the drag reduction portion (42) is composed of a plurality of planes or curved surfaces connected in sequence; The position of the reinforcing rib (4) facing the outflow direction of the hydraulic medium includes a first combined edge (5) and a second combined edge (6) connected to each other, and also includes a reference line (7) parallel to the outflow direction of the hydraulic medium, the reference line (7) passes through the connection point of the first combined edge (5) and the second combined edge (6), and the first rectangular boundary box (8) of the first combined edge (5) and the second rectangular boundary box (9) of the second combined edge (6) are respectively located on both sides of the reference line (7); The angle θ between the major axis of the directional bounding box of the first rectangular bounding box (8) and the reference line (7) is 5-85 degrees.

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