Double Isolation Slurry Pump

Abstract

The present invention belongs to a reciprocating positive displacement slurry pump, and relates to the technical field of diaphragm slurry pumps for conveying abrasive or corrosive media. It includes at least one set of oil cylinders containing pistons or plungers, a vertically installed diaphragm chamber containing a diaphragm with a guide rod in the middle position, an isolation pipe or tank, and an elbow. A three-way connection elbow, a slurry discharge check valve inlet, and a slurry inlet check valve outlet. The diaphragm cavity inlet and outlet are both located at the bottom of a hole that connects the slurry inlet and discharge check valves. The present invention adopts a double isolation diaphragm cavity and an isolation pipe. The diaphragm can separate the conveying and driving media to avoid damage to the power part. The slurry suction volume V can be completely loaded into the isolation tube's internal volume V 2 The diaphragm pushes muddy or clear water instead of large particles, hard or thorny media, which avoids scratching or puncturing the diaphragm and prolongs the life of the diaphragm. The guide rod follows the position of the diaphragm to ensure accurate oil replenishment and discharge. The slurry discharge check valve is located at the bottom of the diaphragm cavity for easy maintenance.

Description

Technical Field

[0001] The invention belongs to a reciprocating positive displacement slurry pump, and relates to the technical field of a diaphragm slurry pump for conveying abrasive or corrosive media. Background Art

[0002] For the structure and working principle of diaphragm slurry pump, please refer to [ Figure 3 Diaphragm slurry pump-round diaphragm], Figure 4

Diaphragm slurry pump - pipe diaphragm

[0003] For problems with diaphragm slurry pumps, see [ Figure 3 Diaphragm slurry pump-round diaphragm], Figure 4 [Diaphragm slurry pump - tube diaphragm]. The technology of diaphragm pump is to use diaphragm to separate driving medium from conveying medium. The technical solution is that slurry enters the diaphragm cavity from the lower diaphragm cavity inlet through the slurry inlet check valve, and then is discharged from the upper outlet of the diaphragm cavity through the slurry discharge check valve. This requires that all conveying media must pass through the diaphragm cavity from bottom to top. Large particles, hard or thorny media are squeezed by the diaphragm, which can easily scratch or puncture the diaphragm, shortening the life of the diaphragm. Using a guide rod to follow the diaphragm position, detection is inaccurate, and oil replenishment and discharge are not accurate. The outlet check valve is located high, which is inconvenient for maintenance. Patent see ZL 03816270.9 Diaphragm Pump Summary of the invention

[0004] In view of the deficiencies of the above-mentioned prior art, the present invention provides a double-isolation slurry pump, which can solve all the above-mentioned problems. Large particles, hard or thorny media will not enter the diaphragm cavity, thus avoiding scratches and punctures of the diaphragm; absolute separation of the driving medium and the conveying medium is achieved; the diaphragm position is followed by a guide rod, and detection and oil replenishment and discharge are accurate.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a double-isolation slurry pump, which adopts a double-isolation-diaphragm cavity and an isolation pipe. A system includes an oil cylinder containing a piston or a plunger, and a vertically mounted diaphragm cavity is connected to one side of the oil cylinder. A diaphragm is installed inside the cavity, and a guide rod is connected in the middle of the diaphragm. The right side of the diaphragm is loaded with a driving medium, called oil, and the left side is loaded with a conveying medium, called liquid. The lower part of the diaphragm cavity is connected to the upper part of the vertically mounted isolation pipe, the lower part of the isolation pipe is connected to the elbow, and the elbow is connected to the tee. The side branch of the tee is connected to the lower inlet end of the slurry discharge check valve, and the upper side opening of the slurry discharge check valve is connected to the slurry discharge pipeline. The tee port is also connected to the upper side opening of the slurry inlet check valve, and the lower inlet end of the slurry inlet check valve is connected to the slurry inlet pipe. The above connection means connection by flange, clamp, insertion, welding and other methods. A double-isolation slurry pump can be composed of multiple systems, with small flow and pressure fluctuations and large flow.

[0006] The diaphragm separates the conveying medium from the driving medium in the diaphragm cavity to prevent the two from mixing. There are two types of diaphragm shapes, one is round, similar to an umbrella; the other is tubular, with two open ends, and both have flanges on the outer edges as sealing rings to prevent the two conveying media from mixing. The diaphragm cavity is a hole at the bottom for both inlet and outlet. The guide rod can be used to indicate the position of the diaphragm.

[0007] The internal volume V2 of the vertically installed isolation tube and elbow shall not be less than the volume V sucked in by the piston or plunger when it moves forward or backward, and the internal diameter of the isolation tube is d1.

[0008] Under the action of external force F, the piston or plunger reciprocates in the oil cylinder, pushing the driving medium. The diaphragm and guide rod also reciprocate with the driving medium. The conveying medium inside passes through the lower hole, sucking in or discharging the conveying medium of volume V; the guide rod moves with the diaphragm to indicate the position of the diaphragm. If the guide rod is too far away from the inclined diaphragm cavity, it means that there is less oil and oil needs to be replenished; if it is too close to the inclined diaphragm cavity, it means that there is more oil and oil needs to be discharged. Because V2 is not less than V, when sucking, the conveying medium of volume V is sucked at one time and is all loaded into the vertical isolation pipe and elbow. Within the total internal volume V2, the newly entered slurry cannot rise into the diaphragm cavity and is located at the bottom of the isolation pipe and elbow; at the same time, the conveying medium of the original volume V in the upper part of the isolation pipe and elbow enters the diaphragm cavity. The newly sucked conveying medium is different from the conveying medium entering the diaphragm cavity. During discharge, the diaphragm cavity pushes out the conveying medium of volume V, which enters the isolation pipe and the upper part of the elbow. At the same time, the newly entered slurry in the lower part of the elbow and the isolation pipe is discharged first, with a volume of V, including large particles, hard or thorny media. Because the newly entered conveying medium V cannot reach the diaphragm cavity, the conveying medium in the diaphragm cavity does not contact the newly entered conveying medium, so the conveying medium in the diaphragm cavity becomes muddy water after natural sedimentation. As the volume V2 increases, the new and old conveying media are not exchanged and contacted, and become clear water. The inner diameter d1 of the isolation pipe is controlled to be not less than the critical flow velocity pipe diameter d0 of a certain particle. The actual flow velocity U of the particle is less than the critical flow velocity U0. After entering the isolation pipe, it cannot continue to rise, piled up in the lower part of the isolation pipe, and cannot rise to the diaphragm cavity. When the piston retreats and inhales, under the action of the external discharge pipeline pressure and negative pressure, the slurry discharge check valve is closed, and the conveying medium flows into the slurry inlet pipe under the action of the feeding pressure and negative pressure, and the slurry inlet check valve is opened, and enters the elbow and isolation pipe through the three-way pipe. When the piston moves forward to discharge, under the action of the internal pressure of the pump, the slurry inlet check valve is closed, the slurry discharge check valve is opened, and the conveying medium flows out from the isolation pipe, elbow, tee, and slurry discharge check valve and is discharged through the slurry discharge pipe.

[0009] Beneficial Effects: Through the double isolation of the diaphragm cavity and the isolation tube, the conveying medium enters and exits from a hole at the bottom of the diaphragm cavity. The diaphragm cavity can separate the conveying and driving media to avoid damage to the power part, and also prevent the conveying medium from passing from the lower end of the diaphragm cavity to the upper end. The lower part of the diaphragm cavity is connected to the isolation tube, and the newly sucked conveying medium remains in the isolation tube and the elbow without entering the diaphragm cavity. The diaphragm cavity sucks in and discharges the conveying medium without contacting the newly sucked conveying medium. The diaphragm pushes muddy or clear water instead of large particles, hard or thorny media, avoiding scratches and punctures of the diaphragm, and the diaphragm has a longer service life. The guide rod follows the diaphragm position, and the oil replenishment and discharge are executed accurately. The slurry discharge check valve is at the bottom of the diaphragm cavity, which is easy to install and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Double isolation slurry pump - round diaphragm, is the embodiment of the present invention, the diaphragm is a round diaphragm

[0011] Figure 2Double isolation slurry pump - tube diaphragm, is the second embodiment of the present invention, the diaphragm uses a tube diaphragm

[0012] Figure 3 Diaphragm slurry pump - round diaphragm, there is already a use of Example 1, the diaphragm is a round diaphragm

[0013] Figure 4 Diaphragm slurry pump - tube diaphragm, existing use embodiment 1, diaphragm tube diaphragm

[0014] The accompanying drawings are marked as follows: 1, slurry inlet pipe; 2, slurry inlet check valve; 3, tee pipe; 4, slurry discharge check valve; 5, elbow; 6, isolation pipe or tank; 7, slurry discharge pipe; 8, diaphragm cavity inlet hole; 8' diaphragm cavity outlet hole; 9, diaphragm; 10, diaphragm cavity; 11, conveying medium; 12, driving medium; 13, guide rod; 14, oil cylinder; 15, piston or plunger DETAILED DESCRIPTION

[0015] Figure 1 The double isolation slurry pump-circular diaphragm is the first embodiment of the present invention, and the diaphragm uses a circular diaphragm. Figure 2 The double isolation slurry pump-tube diaphragm is the second embodiment of the present invention, and the diaphragm is a tube diaphragm. Figure 1 , Figure 2 , the present invention is described in detail.

[0016] A cylinder (14) containing a piston or plunger (15) is connected to a diaphragm cavity (10) vertically through a pipeline. A diaphragm (9) is installed inside the diaphragm cavity (10), and a guide rod (13) is connected in the middle of the diaphragm (9). There are two types of diaphragm (9) shapes, one is round, similar to an umbrella; the other is a rubber hose with two open ends. Both outer edges have convex sealing rings for sealing. The diaphragm (9) divides the diaphragm cavity (10) into two parts, and the two do not mix. The right side is filled with oil, which is called oil, and the left side is filled with slurry or muddy water, which is called liquid. The diaphragm cavity has a hole at the bottom end on the liquid side, which is used as a liquid inlet hole (8) and outlet hole (8'). The diaphragm cavity inlet hole (8) is connected to the upper part of the isolation tube (6), the lower part of the isolation tube (6) is connected to the elbow (5), and the elbow (5) is connected to the three-way pipe (3). The side branch of the tee (3) is connected to the lower inlet end of the slurry discharge check valve (4), and the upper side opening of the slurry discharge check valve (4) is connected to the slurry discharge pipe (7). The port of the tee (3) is also connected to the upper side opening of the slurry inlet check valve (2). The lower inlet end of the slurry inlet check valve (2) is connected to the slurry inlet pipe (1). The above connection means connection by flange, clamp, insertion, welding and other methods. The present invention adopts a double isolation-diaphragm cavity (10) and an isolation pipe (6), and the diaphragm cavity inlet (8) and outlet (8') are one, which are at the lower part of the diaphragm cavity (10). The isolation pipe (6) is at the lower part of the diaphragm cavity (10), and the slurry inlet and discharge check valve (4) is at the lower part of the diaphragm cavity (10) and the isolation pipe (6). The above connection means connection by flange, clamp, insertion, welding and other methods.

[0017] The internal volume V2 of the isolation tube (6) and the elbow (5) is not less than the displacement volume V of the piston or plunger.

[0018] Working Principle When slurry is sucked, the piston or plunger (15) moves rightward, and under the action of pressure difference, the discharge check valve (4) is closed, and the inlet check valve (2) is opened. The slurry (11) containing large particles, hard or thorny media, etc., passes through the inlet check valve (2), the three-way pipe (3), the vertical elbow (5) and the isolation pipe (6). The original volume V of the slurry in the isolation pipe (6) enters the diaphragm cavity (10). The oil (12) on the other side of the diaphragm (9) is sucked into the oil cylinder (14) by the piston or plunger (15). When discharging slurry, the piston or plunger (15) in the oil cylinder (14) moves to the left, pushing the oil (12) into the diaphragm cavity, squeezing the diaphragm (9) to move to the other side of the liquid cavity, pushing the slurry (11) in the diaphragm cavity from the outlet (8') to the isolation pipe (6), the vertical elbow (5), and the tee (3), closing the slurry inlet check valve (2), and opening the slurry discharge check valve (4) to be discharged through the slurry discharge pipe (7).

[0019] The piston or plunger (15) drives the oil volume V, and at the same time, the slurry volume V enters from the slurry inlet check valve (2) or is discharged from the slurry discharge check valve (4), all through the elbow (5), the isolation pipe (6) and the diaphragm chamber (10) liquid cavity. Because the isolation pipe volume V2 is not less than V, when the slurry is introduced, the slurry V is sucked at one time and all loaded into the vertical isolation pipe volume V2, which is called the newly introduced slurry. Because the newly introduced slurry cannot reach the diaphragm chamber (10), the slurry inside it does not contact the newly introduced slurry, so the conveying medium in the diaphragm chamber becomes muddy water after natural sedimentation. As the volume V2 increases, the new and old conveying media are not exchanged and contacted, and the muddy water in the diaphragm chamber (10) even becomes clear water.

[0020] The inner diameter d1 of the isolation tube (6) is controlled to be not less than the critical flow velocity tube diameter d0 of a certain particle. When the actual flow velocity U of the particle is less than the critical flow velocity U0, the particle cannot continue to rise after entering the isolation tube (6) and is squeezed at the lower part of the isolation tube (6) and cannot rise to the diaphragm cavity (10).

[0021] The guide rod (13) moves with the diaphragm (9) to indicate the position of the diaphragm (9). If the guide rod (13) is too far away from the diaphragm cavity (10), it means that the oil is insufficient and oil needs to be replenished; if the guide rod (13) is too close to the diaphragm cavity (10), it means that the oil is excessive and oil needs to be drained.

[0022] The diaphragm cavity (10) and the isolation tube (6) are double isolated. The liquid (11) enters and exits from a hole (8, 8') at the bottom of the diaphragm cavity. The diaphragm cavity (10) can separate the liquid (11) from the oil (12) to avoid damage to the power part, and can also prevent the slurry from passing from the lower end of the diaphragm cavity (10) to the upper end. The lower part of the diaphragm cavity (10) is connected to the isolation tube (6). The newly sucked slurry (11) remains in the isolation tube (6) and does not enter the diaphragm cavity (10). The diaphragm cavity (10) sucks and discharges liquid without contacting the newly sucked slurry. The diaphragm (9) pushes muddy water or clear water instead of large particles, hard or thorny slurry, avoiding scratches and punctures of the diaphragm (9), and its service life is longer. The guide rod (13) follows the position of the diaphragm (9) to ensure accurate oil replenishment and discharge. The slurry discharge check valve (4) is located at the lower part of the diaphragm cavity, which is easy to install and repair.

Claims

1. A double-isolated slurry pump, comprising an oil cylinder (14) with at least one piston or plunger (15), wherein the piston or plunger (15) reciprocates under the action of an external force F, wherein one side of the oil cylinder (14) is connected to a vertical diaphragm cavity (10), wherein a diaphragm (9) is installed in the cavity, wherein a guide rod (13) is connected in the middle of the diaphragm (9), wherein the lower end of the diaphragm cavity (10) is connected to the upper end of a vertically mounted isolation pipe (6), wherein the lower end of the isolation pipe (6) is connected to an elbow (5), wherein the elbow (5) is connected to a tee pipe (3), wherein the tee pipe (3) is connected to the lower inlet end of a slurry discharge check valve (4), wherein an upper side opening of the slurry discharge check valve (4) is connected to the slurry discharge pipe (7 ), the three-way pipe (3) is also connected to the upper side opening of the slurry inlet check valve (2), and the lower inlet end of the slurry inlet check valve (2) is connected to the slurry inlet pipe (1). All the above connections are connected by flanges, clamps, insertion or welding. The diaphragm (9) has two shapes, one is round, similar to an umbrella, and the other is tubular, with two ends open. The outer edge of the diaphragm (9) in both types has a flange as a sealing ring. The diaphragm (9) can separate the conveying medium (11) and the driving medium (12) in the diaphragm cavity (10), and the two are not mixed. The guide rod (13) moves with the diaphragm (9) and is used to detect the position of the diaphragm (9). It is characterized by: The diaphragm cavity inlet hole (8) and the diaphragm cavity outlet hole (8') at the lower end of the diaphragm cavity (10) share a hole, which is connected to the slurry discharge check valve (4), the slurry inlet check valve (2), and the isolation pipe (6); the oil is replenished and discharged according to the position of the diaphragm (9) indicated by the guide rod (13); The upper end of the isolation tube (6) is connected to the diaphragm cavity inlet hole (8) at the lower end of the diaphragm cavity (10). The internal volume V2 of the isolation tube (6) and the elbow (5) is not less than the volume V sucked by the piston or plunger (15) when it retreats. The slurry containing large particles, hard or thorny media can be completely loaded into the vertical isolation tube (6) and the elbow (5) without entering the diaphragm cavity (10). The inner diameter d1 of the isolation tube (6) is controlled to be not less than the critical flow velocity diameter d0 of the particles. When the slurry is introduced, the actual flow velocity U of the particles is less than their critical flow velocity U0. After entering the isolation tube (6), they cannot continue to rise and are squeezed at the lower part of the isolation tube (6) to avoid entering the diaphragm cavity (10). When discharging the slurry, the conveying medium at the lower part of the isolation tube (6) is discharged first, and the discharge volume is V.

2. A double-isolation slurry pump according to claim 1, characterized in that: The slurry discharge check valve (4) is located below the diaphragm chamber (10) and has a low height, which is convenient for installation and maintenance.

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