A split suction pipe seat structure for a high-pressure slurry diaphragm pump

Abstract

This utility model relates to the field of high-pressure diaphragm pumps, specifically to a split suction pipe seat structure for a high-pressure slurry diaphragm pump. It includes a horizontal pipe for connecting to the feed valve box and a vertical pipe for connecting to the diaphragm chamber. The wall thickness of the vertical pipe is greater than that of the horizontal pipe. A side connecting cavity, communicating with the vertical pipe's cavity, is opened on the vertical pipe wall. Flanges are provided at both ends of the horizontal pipe, and the cavity of the horizontal pipe communicates with the side connecting cavity through the flanges. The diameter of the horizontal pipe cavity is the same as the diameter of the side connecting cavity. This split suction pipe seat structure for a high-pressure slurry diaphragm pump improves the overall material density and mechanical properties of the suction pipe seat, effectively disperses or avoids stress concentration, and possesses excellent high-pressure resistance and structural stability, meeting the requirements for long-term stable operation of high-pressure slurry diaphragm pumps.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure diaphragm pumps, specifically to a split suction pipe seat structure for a high-pressure slurry diaphragm pump. Background Technology

[0002] High-pressure slurry diaphragm pumps are special conveying equipment designed for high-concentration, high-pressure slurry media containing solid particles. They are widely used in mining, metallurgy, chemical and other fields. The core function is to stably convey slurry (such as flotation tailings, concentrate, roasted ore, etc.) under high-pressure conditions, avoid excessive wear on the pump body caused by solid particles, and meet the precise control requirements of conveying pressure and flow rate in the process. In high-pressure slurry diaphragm pumps, the suction pipe seat is a key component connecting the diaphragm chamber and the feed valve, playing the roles of fluid conveying, vibration stabilization and support.

[0003] In existing technologies, the straw seat, as a flow-through component, has very high requirements for high pressure resistance and quality stability. Typically, the straw seat is an elbow-type structure, using an integral casting construction. However, this design has significant technical drawbacks: Firstly, the casting process easily leads to structural defects such as porosity and air bubbles inside the straw seat, significantly reducing its mechanical properties (such as tensile strength and impact toughness), making it difficult to withstand continuous loads under high pressure conditions, and prone to cracking, leakage, and other failures. Secondly, stress concentration is highly likely to occur at the internal direction change points (i.e., corner positions) and thin-walled areas of the integral elbow structure. Under the impact and alternating loads of high-pressure slurry, fatigue damage will gradually form at these stress concentration points, further shortening the service life of the straw seat and even causing equipment shutdown, seriously affecting production efficiency.

[0004] Therefore, there is an urgent need for a suction pipe seat that can improve the overall material density and mechanical properties of the suction pipe seat, while effectively dispersing or avoiding stress concentration, and possessing excellent high pressure resistance and structural stability to meet the requirements of long-term stable operation of high pressure slurry diaphragm pumps. Utility Model Content

[0005] The present invention aims to provide a split suction pipe seat structure for a high-pressure slurry diaphragm pump, which can improve the overall material density and mechanical properties of the suction pipe seat, while effectively dispersing or avoiding stress concentration, and has excellent high pressure resistance and structural stability, thus meeting the requirements for long-term stable operation of the high-pressure slurry diaphragm pump.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a split suction pipe seat structure for a high-pressure slurry diaphragm pump, comprising a horizontal pipe for connecting to the feed valve box and a vertical pipe for connecting to the diaphragm chamber. The wall thickness of the vertical pipe is greater than that of the horizontal pipe. A side connecting cavity communicating with the cavity of the vertical pipe is opened on the wall of the vertical pipe. Flanges are provided at both ends of the horizontal pipe. The cavity of the horizontal pipe is connected to the side connecting cavity through the flanges. The diameter of the cavity of the horizontal pipe is the same as the diameter of the side connecting cavity.

[0007] Furthermore, the wall of the horizontal pipe protrudes radially outward in the middle to form an annular reinforcing rib, and the protrusion height of the annular reinforcing rib is lower than that of the flanges at both ends of the horizontal pipe.

[0008] Furthermore, the cross-section of the annular reinforcing rib along the axial direction of the horizontal tube is an isosceles trapezoid, with the short side of the isosceles trapezoid protruding outwards and the two base corners of the long side forming an arc transition connection with the tube wall of the horizontal tube.

[0009] Furthermore, the axis of the side connecting lumen is perpendicular to the axis of the riser lumen, and the side connecting lumen is connected to the riser lumen to form an L-shaped lumen.

[0010] Furthermore, the pipe wall of the riser protrudes outward radially to form a support frame connecting protrusion, which connects to the pipe cavity on the opposite side of the riser's radial direction.

[0011] Furthermore, the top of the riser is equipped with a flange for connecting the diaphragm chamber.

[0012] The beneficial effects of this solution are as follows: This utility model splits the traditional integral elbow structure into two parts, a horizontal pipe and a vertical pipe, avoiding the stress concentration problem at the corner of the integral elbow's inner cavity. Because the inner cavity of the integral suction pipe seat is a continuous elbow channel, when the medium flows under high pressure, fluid impact force is generated at the corner. Simultaneously, the abrupt change in the structure's geometry (the transition from horizontal to vertical) leads to stress concentration, meaning stress is concentrated in the local area at the corner, far exceeding the material's bearing capacity and easily causing fatigue cracks. After splitting, the original integral elbow's "corner" is transformed into a "planar connection surface" between the two components. The abrupt change in geometry disappears, and the fluid impact force and structural mechanical stress are no longer concentrated at the corner, but are dispersed to the bolted connection between the side connecting pipe cavity of the vertical pipe and the horizontal pipe (i.e., the bolts on the flange bear the stress), thus reducing and dispersing stress concentration structurally.

[0013] The support frame connecting protrusions of the riser and the annular reinforcing ribs of the horizontal pipe work together to further disperse stress in key parts of the pipe body, effectively reducing the risk of fatigue damage and extending the service life of the components. The annular reinforcing ribs in the middle of the horizontal pipe are connected by an arc-shaped transition, which enhances the structural strength while avoiding sudden changes in local stress. The riser adopts a thicker pipe wall design, combined with the material advantages of forging technology, which significantly improves the riser's high-pressure resistance and impact resistance, making it suitable for the harsh operating conditions of high-pressure slurry diaphragm pumps. Both the horizontal and riser pipes can be formed by forging. Compared with traditional casting technology, forging materials have a denser internal structure, free from defects such as porosity and air bubbles, and significantly improved mechanical properties such as tensile strength and impact toughness. This allows them to withstand the continuous load and impact of high-pressure slurry, reducing cracking, leakage and other failures, and lowering equipment maintenance costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention. Figure I ; Figure 2 This is a schematic diagram of the structure of the vertical tube in this utility model; Figure 3 This is a schematic diagram of the horizontal tube structure in this utility model; Figure 4 This is a schematic diagram of the structure of the present invention. Figure II .

[0015] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: horizontal pipe 1, vertical pipe 2, side connecting pipe cavity 3, annular reinforcing rib 4, and flange 5. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] The basic implementation examples are as follows: Figure 1-4 As shown in the attached document Figure 1The diagram illustrates a split suction pipe structure for a high-pressure slurry diaphragm pump, comprising a horizontal pipe for connecting to the feed valve box and a vertical pipe for connecting to the diaphragm chamber. The wall thickness of the vertical pipe is greater than that of the horizontal pipe. Because the vertical pipe must simultaneously withstand the impact of the high-pressure slurry from the diaphragm chamber, the gravity load of the horizontal pipe, and the weight of the slurry itself, as shown in the attached diagram... Figure 4 As shown, thickening the pipe wall enhances its resistance to deformation and impact, preventing localized dents or cracks in the riser under long-term high pressure, and reducing localized stress during slurry impact. This includes the horizontal pipe 1 connecting the feed valve box and the riser 2 connecting the diaphragm chamber. The wall thickness of riser 2 is greater than that of horizontal pipe 1. Since riser 2 must simultaneously withstand the high-pressure slurry impact from the diaphragm chamber, the gravity load of horizontal pipe 1, and the weight of the slurry itself, thickening the pipe wall enhances its resistance to deformation and impact, preventing localized dents or cracks in riser 2 under long-term high pressure, and reducing localized stress during slurry impact; as shown in the attached diagram. Figure 3 As shown, the riser 2 has a side connecting cavity 3 on its wall, which communicates with the cavity of the riser 2. Flanges 5 are installed at both ends of the horizontal pipe 1, and the cavity of the horizontal pipe 1 communicates with the side connecting cavity 3 through the flanges 5. The diameter of the cavity of the horizontal pipe 1 is the same as the diameter of the side connecting cavity 3. This matching diameter prevents sudden changes in slurry velocity at the junction of the horizontal pipe 1 and the riser 2 (e.g., a decrease in diameter leading to a sudden increase in velocity, exacerbating pipe wall erosion; or an increase in diameter leading to a sudden decrease in velocity, causing slurry particle accumulation), ensuring stable fluid flow. An existing sealing gasket (not shown in the figure) is installed between the connection surfaces of the horizontal pipe 1 and the riser 2 (i.e., between the cavity of the horizontal pipe 1 and the side connecting cavity 3) to ensure sealing performance under high pressure conditions and prevent slurry leakage.

[0019] As attached Figure 3 As shown, the wall of the horizontal pipe 1 protrudes radially outward in the middle to form an annular reinforcing rib 4. The protrusion height of the annular reinforcing rib 4 is lower than that of the flanges 5 at both ends of the horizontal pipe 1. The middle part of the horizontal pipe 1 is a weak area far from the support of the flanges 5. Pressure fluctuations generated during slurry flow can easily cause radial vibration or local deformation in this area. The annular reinforcing rib 4 can increase the moment of inertia of the cross section in the middle of the horizontal pipe 1, thereby improving the bending and vibration resistance and reducing stress concentration. The annular reinforcing rib 4 is continuously arranged along the circumference of the horizontal pipe 1, forming an "annular protrusion". As a preferred embodiment, the radial height of the protrusion is 8mm to 12mm, and the axial width (along the length of the horizontal pipe 1) is 40mm to 60mm. The radial protrusion height of the flanges 5 at both ends of the horizontal pipe 1 (from the outer surface of the pipe wall to the outer edge of the flange 5) is set to 25mm to 30mm. This design can avoid spatial interference between the annular reinforcing rib and other components of the diaphragm pump (such as the frame and pipeline supports), and at the same time, it does not affect the assembly operation of the horizontal pipe 1 (such as the installation and removal of the flange bolts).

[0020] The cross-section of the annular reinforcing rib 4 along the axial direction of the horizontal tube 1 is an isosceles trapezoid. The short side of the isosceles trapezoid protrudes outward, and the two base corners of the long side are connected to the tube wall of the horizontal tube 1 in an arc shape. The outer short side of the isosceles trapezoid cross-section can reduce the risk of interference with external components, while the inner long side can increase the contact area with the tube wall of the horizontal tube 1, thereby improving the connection strength between the reinforcing rib and the tube wall. At the same time, the gradual thickness of the trapezoidal structure can make the stress evenly transferred along the waist to the tube wall, avoiding sudden changes in local stress.

[0021] The two base corners of the long side of the isosceles trapezoid (where it connects with the wall of the horizontal tube 1) are curved. As a preferred embodiment, the curve is a circular arc with a radius of 6mm to 10mm. The curved transition can avoid the occurrence of stress sharp corners at the connection between the annular reinforcing rib 4 and the tube wall (if it is a right-angle connection, the stress will accumulate at the sharp corner, and cracks are likely to occur after long-term use).

[0022] The axis of the side connecting tube 3 is perpendicular to the axis of the riser tube 2, and the side connecting tube 3 and the riser tube 2 are connected to form an L-shaped tube; as shown in the attached figure. Figure 1 As shown, the axis of the riser 2 is vertical (perpendicular to the ground), and the axis of the side-connecting pipe 3 is horizontal (parallel to the ground). The intersection of their axes is located on the center line of the riser 2's cavity, and the angle error between the axes is ≤1° (accuracy is ensured by existing machining fixtures). This ensures that they are perpendicular and avoids oblique connections that could obstruct slurry flow. The diaphragm pump's feed valve box is usually horizontally arranged, and the diaphragm chamber is usually vertically arranged. The side-connecting pipe 3, being perpendicular to the axis of the riser 2, can directly adapt to this layout without the need for additional diversion joints (if the axis is not perpendicular, joints need to be added, which not only increases costs but also introduces new leakage points and stress concentration points). The L-shaped pipe cavity ensures smooth diversion of the slurry from the diaphragm chamber (vertically downward) to the feed valve box (horizontally conveyed), reducing energy loss.

[0023] The pipe wall of riser 2 protrudes outward radially to form a support frame connecting protrusion. The support frame connecting protrusion connects to the pipe cavity 3 on the opposite side of the riser 2 in the radial direction. The support frame connecting protrusion is located on the pipe wall of riser 2 and connects to the pipe cavity 3 on the opposite side of the riser 2 in the radial direction (i.e., the protrusion and the side connecting pipe cavity 3 are located on both sides of riser 2, and their axes are collinear). As a preferred embodiment, the protrusion is cuboid in shape, with a length (along the axial direction of riser 2) of 50mm to 70mm, a width (along the circumferential direction of riser 2) of 30mm to 40mm, and a height (along the radial direction of riser 2) of 20mm to 25mm. After the side connecting tube 3 is connected to the horizontal tube 1, the horizontal tube 1 will generate horizontal tension and bending moment on the riser 2 (especially when the slurry flows and impacts). This force will cause the riser 2 to tilt away from the horizontal tube 1. By placing the support frame connecting protrusion directly opposite the side connecting tube 3, the support frame can apply a reverse horizontal force to the protrusion, balancing the bending moment generated by the horizontal tube 1 and preventing the riser 2 from tilting or the stress at the side connection point from being too high. At the same time, the support frame connecting protrusion allows the bottom of the riser 2 to connect to the equipment base, forming a three-point support of "top connecting to the diaphragm chamber, bottom connecting to the base, and middle connecting to the frame", further dispersing the force on the riser 2 and preventing the riser 2 from tilting or deforming due to long-term stress.

[0024] As attached Figure 2 As shown, the top of the riser 2 is provided with a flange 5 for connecting the diaphragm chamber. In a preferred embodiment, the flange 5 at the top of the riser 2 is integrally forged with the pipe wall of the riser 2 (to avoid strength loss caused by welding). The flange 5 at the top of the riser 2 is a key part for connecting the diaphragm chamber and needs to withstand the high pressure transmitted by the diaphragm chamber (usually the highest working pressure of the pump). Integral forging can ensure the connection strength between the flange 5 and the pipe wall of the riser 2 (without welding defects) and prevent the flange 5 from warping due to high pressure, which would lead to sealing failure.

[0025] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A split-type suction pipe seat structure for a high-pressure slurry diaphragm pump, characterized in that: It includes a horizontal pipe for connecting the feed valve box and a vertical pipe for connecting the diaphragm chamber. The wall thickness of the vertical pipe is greater than that of the horizontal pipe. The vertical pipe has a side connecting cavity that communicates with the pipe cavity of the vertical pipe. Flanges are provided at both ends of the horizontal pipe. The pipe cavity of the horizontal pipe is connected to the side connecting cavity through the flanges. The pipe cavity diameter of the horizontal pipe is the same as that of the side connecting cavity.

2. The split suction pipe seat structure for a high-pressure slurry diaphragm pump according to claim 1, characterized in that: The wall of the horizontal pipe protrudes radially outward in the middle to form an annular reinforcing rib, and the protrusion height of the annular reinforcing rib is lower than that of the flanges at both ends of the horizontal pipe.

3. The split suction pipe seat structure for a high-pressure slurry diaphragm pump according to claim 2, characterized in that: The cross-section of the annular reinforcing rib along the axial direction of the horizontal tube is an isosceles trapezoid, with the short side of the isosceles trapezoid protruding outwards and the two base corners of the long side connecting to the tube wall in an arc shape.

4. The split suction pipe seat structure for a high-pressure slurry diaphragm pump according to claim 1, characterized in that: The axis of the side connecting tube is perpendicular to the axis of the riser tube, and the side connecting tube is connected to the riser tube to form an L-shaped tube.

5. The split suction pipe seat structure for a high-pressure slurry diaphragm pump according to claim 1, characterized in that: The pipe wall of the riser protrudes outward radially to form a support frame connecting protrusion, which connects to the pipe cavity on the opposite side of the riser's radial direction.

6. The split suction pipe seat structure for a high-pressure slurry diaphragm pump according to claim 1, characterized in that: The top of the riser is equipped with a flange for connecting the diaphragm chamber.

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