A diaphragm pump for conveying a solid-liquid two-phase flow

Abstract

The application relates to a diaphragm pump for conveying solid-liquid two-phase flow, which comprises a shell, a power chamber, a working chamber, a diaphragm and the like; the diaphragm is arranged between the power chamber and the working chamber; a valve seat is arranged on the shell; an inlet ball valve and an outlet ball valve are arranged on the valve seat; an inlet pipeline and an outlet pipeline are arranged on the working chamber; the power chamber is driven by a power machine; hydraulic oil is pushed to act on the diaphragm, so that the diaphragm continuously reciprocates. The diaphragm and the transmission part of the application effectively isolate the pump cavity and the driving part, so that the diaphragm pump can be dry operated, and the pump cannot be damaged due to particles in the medium. In the application, the inclined elbow pipe design can prevent particles from being deposited above the valve ball to block the ball valve, and can slow down the speed of the particles impacting the diaphragm; the fluid provided by the lower branch inlet pipe provides an upward disturbance to the particles, further slows down the impact on the diaphragm, and the filter screen can prevent the particles deposited in the pump cavity from flowing back to the pipeline.

Description

Technical Field

[0001] This invention relates to a diaphragm pump, specifically to a diaphragm pump for conveying solid-liquid two-phase flow, which is equipped with a diaphragm and whose arrangement of the inlet and outlet flow channels of the pump cavity reduces the impact on the diaphragm, extends the diaphragm life, and reduces the possibility of ball valve blockage. Background Technology

[0002] In recent years, a method of mineral lifting using a combination of shipborne high-pressure electric pumps and underwater diaphragm pump sets has been tried in deep-sea mining slurry transportation. This method can avoid underwater power supply. At the same time, hydraulic diaphragm reciprocating pumps have the characteristics of large flow rate, high working pressure, small flow pulsation, and flow rate that is basically unaffected by pressure. Therefore, they are suitable for underwater transportation of solid-liquid two-phase fluids over ultra-long distances.

[0003] However, the one-way valve of the diaphragm pump limits its ability to transport larger particles. When the ball valve is closed, particle settling can cause blockage of the ball valve. The diaphragm is impacted by particles and needs to be replaced, wasting manpower and time. The two-phase turbulence in the flow channel inside the pump chamber is complex. Summary of the Invention

[0004] To address the aforementioned problems, the main objective of this invention is to provide a diaphragm pump for conveying solid-liquid two-phase flow, which is equipped with a diaphragm sheet, and whose arrangement of the inlet and outlet flow channels of the pump cavity reduces the impact on the diaphragm sheet, extends the diaphragm life, and reduces the possibility of ball valve blockage.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution: a diaphragm pump for conveying solid-liquid two-phase flow, the diaphragm pump for conveying solid-liquid two-phase flow includes: a housing, a power chamber, a working chamber, a diaphragm, and a safety valve; the diaphragm is disposed between the power chamber and the working chamber, the safety valve is fixedly disposed on the housing, a valve seat is disposed on the housing, and an inlet ball valve and an outlet ball valve are disposed on the valve seat.

[0006] The working chamber is equipped with inlet pipes and outlet pipes. The inlet pipes include an upper inlet pipe and a lower inlet pipe; the outlet pipes include an upper outlet pipe and a lower outlet pipe.

[0007] The power chamber is a hydraulic chamber composed of a sleeve and a plunger; the power chamber is driven by a power machine, which pushes the hydraulic oil to act on the diaphragm, causing the diaphragm to reciprocate continuously.

[0008] In a specific embodiment of the present invention, the upper inlet pipe is an upper inlet pipe with an inclined angle, and the lower inlet pipe is a lower inlet pipe with an inclined angle.

[0009] In a specific embodiment of the present invention, both ends of the upper inlet pipe and the lower inlet pipe are equipped with filter screens to block the flow of particles.

[0010] In a specific embodiment of the present invention, when the diaphragm expands, the pressure in the working chamber drops sharply. The pressure difference causes the fluid carrying particles to flow through the inlet ball valve and into the working chamber from the upper and lower inlet pipes. Due to the presence of the filter screen, only fluid passes through the upper and lower inlet pipes. The two phases enter the pump chamber in an oblique jet. The fluid at the lower inlet jets upwards and merges with the two-phase fluid, mitigating its impact force. When the diaphragm compresses, the pressure in the working chamber increases significantly, creating a large pressure difference with both the area below the inlet ball valve and the area above the outlet ball valve. This forces the inlet ball valve to close and the outlet ball valve to open. The two-phase fluid mainly leaves the working chamber from the upper outlet. A circulating flow is formed at the lower double inlet. Due to the presence of the filter screen, only fluid passes through the lower inlet pipe. The area above the outlet ball valve is affected by the fluid flow, preventing particles from settling and clogging the ball valve.

[0011] In a specific embodiment of the present invention, both the inlet ball valve and the outlet ball valve are one-way valves composed of a weighted ball and a valve chamber.

[0012] In a specific embodiment of the present invention, the upper inlet pipe is arranged at a 45° angle to introduce the solid-liquid two-phase fluid.

[0013] In a specific embodiment of the present invention, the lower inlet pipe is arranged at a 30° angle to allow liquid to enter.

[0014] In a specific embodiment of the present invention, the safety valve is a spring-loaded safety valve.

[0015] In a specific embodiment of the present invention, the diaphragm is a flat diaphragm made of oil-resistant rubber and polytetrafluoroethylene bonded together.

[0016] The positive and progressive effects of the present invention are as follows: The diaphragm pump for conveying solid-liquid two-phase flow provided by the present invention has the following advantages:

[0017] (1) The diaphragm and transmission components of the diaphragm pump provided by the present invention effectively isolate the pump chamber and the drive part, so that the diaphragm pump can run dry and will not be damaged by particles in the medium.

[0018] (2) The flow rate of the diaphragm pump provided by the present invention is basically unaffected by pressure, and it is suitable for hydraulic transportation of minerals at depths of several thousand meters underwater, and the head issue is basically not required.

[0019] (3) The inclined bend design in this invention can prevent particles from settling above the valve ball and clogging the ball valve, and can also reduce the speed at which particles impact the diaphragm. The fluid in the lower branch inlet pipe provides an upward disturbance to the particles, further reducing the impact on the diaphragm. The filter screen can prevent settled particles in the pump chamber from flowing back into the pipeline. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] The following are the names corresponding to the reference numerals in this invention:

[0022] 1. Outlet valve ball; 2. Valve seat; 3. Upper outlet pipe; 4. Lower outlet pipe; 5. Diaphragm; 6. Upper inlet pipe; 7. Lower inlet pipe; 8. Filter screen; 9. Safety valve; 10. Piston; 11. Sleeve; 12. Hydraulic chamber; 13. Inlet ball valve. Detailed Implementation

[0023] The preferred embodiments of the present invention are given below with reference to the accompanying drawings to illustrate the technical solution of the present invention in detail.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention. As shown in the figure: The diaphragm pump for conveying solid-liquid two-phase flow provided by the present invention includes: a housing, a power chamber, a working chamber, a diaphragm 5, and a safety valve 9; the diaphragm 5 is disposed between the power chamber and the working chamber, the safety valve 9 is fixedly disposed on the housing, and a valve seat 2 is disposed on the housing, with an inlet ball valve 13 and an outlet ball valve 1 disposed on the valve seat 2.

[0025] The working chamber is equipped with an inlet pipe and an outlet pipe. The inlet pipe includes an upper inlet pipe 6 and a lower inlet pipe 7; the outlet pipe includes an upper outlet pipe 3 and a lower outlet pipe 4.

[0026] The power chamber is a hydraulic chamber 12 composed of a sleeve 11 and a plunger 10; the power chamber is driven by a power machine, which pushes the hydraulic oil to act on the diaphragm 5, so that the diaphragm 5 reciprocates continuously.

[0027] The upper inlet pipe 6 is an inclined upper inlet pipe 6, and the lower inlet pipe is a inclined lower inlet pipe 7.

[0028] Both ends of the upper inlet pipe 6 and the lower inlet pipe 7 are equipped with filter screens to block the flow of particles.

[0029] When the diaphragm 5 expands, the pressure in the working chamber drops sharply. The pressure difference causes the fluid carrying particles to flow through the inlet ball valve 13 and into the working chamber from the upper inlet pipe 6 and the lower inlet pipe 7. Due to the presence of the filter screen, only fluid passes through the upper inlet pipe 6 and the lower inlet pipe 7. The two phases enter the pump chamber in an oblique jet. The fluid at the lower inlet jets upward and merges with the two phases, mitigating their impact. When the diaphragm 5 compresses, the pressure in the working chamber increases significantly, creating a large pressure difference with both the area below the inlet ball valve and the area above the outlet ball valve. This forces the inlet ball valve to close and the outlet ball valve to open. The two phases mainly leave the working chamber from the upper outlet. A circulating flow is formed at the lower double inlet. Due to the presence of the filter screen, only fluid passes through the lower inlet pipe. The area above the outlet ball valve is affected by the fluid flow, preventing particles from settling and clogging the ball valve.

[0030] Both the inlet ball valve 13 and the outlet ball valve 1 are one-way valves consisting of a weighted ball and a valve chamber.

[0031] The upper inlet pipe 1 of the present invention is inclined at 45° (this angle is only for example and not a limitation) to introduce solid-liquid two-phase fluid, and the lower inlet pipe 2 is inclined at 30° (this angle is only for example and not a limitation) to introduce water.

[0032] In one alternative design, the safety valve of the present invention is a spring-loaded safety valve.

[0033] The diaphragm sheet of the present invention is a flat diaphragm sheet made of oil-resistant rubber and polytetrafluoroethylene bonded together. The oil-resistant rubber contacts the hydraulic oil, and the polytetrafluoroethylene contacts the corrosive medium, thereby improving the safety of transportation.

[0034] In an alternative design, the ball valve of the present invention is made of stainless steel and is obtained by turning, milling and grinding to obtain a solid self-weight valve ball.

[0035] In one alternative design, the lower inlet pipe of the working chamber is equipped with filter screens at both ends. This inlet pipe only allows clean water to pass through, disturbing the two-phase fluid flowing in from the upper inlet pipe and reducing the impact on the diaphragm. The lower inlet pipe is inclined and connected above the inlet ball valve. When the diaphragm is compressed, the dual inlet arrangement will cause fluid circulation. The lower inlet pipe can disturb the sedimented particles above the inlet ball valve and prevent blockage.

[0036] In an alternative design, the working chamber and dual outlet pipes of the present invention are both arranged with vertical diaphragm plates 5 to balance the rapidly changing flow field within the diaphragm pump.

[0037] The diaphragm and transmission components of this invention effectively isolate the pump chamber and the drive unit, allowing the diaphragm pump to operate dry without being damaged by particles in the medium.

[0038] The flow rate of this invention is basically unaffected by pressure, making it suitable for hydraulic transport of minerals at depths of several thousand meters underwater, with virtually no need to consider the head issue.

[0039] The inclined bend design in this invention prevents particles from settling above the valve ball and clogging the ball valve, and also reduces the speed at which particles impact the diaphragm. The fluid in the lower branch inlet pipe provides an upward disturbance to the particles, further reducing the impact on the diaphragm. The filter screen prevents settled particles in the pump chamber from flowing back into the pipeline.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as defined by the appended claims and their equivalents.

Claims

1. A diaphragm pump for conveying solid-liquid two-phase flow, characterized in that: The diaphragm pump for conveying solid-liquid two-phase flow includes: a housing, a power chamber, a working chamber, a diaphragm, and a safety valve; the diaphragm is disposed between the power chamber and the working chamber, the safety valve is fixedly disposed on the housing, the housing is provided with a valve seat, and the valve seat is provided with an inlet ball valve and an outlet ball valve; The working chamber is equipped with inlet pipes and outlet pipes. The inlet pipes include an upper inlet pipe and a lower inlet pipe; the outlet pipes include an upper outlet pipe and a lower outlet pipe. The power chamber is a hydraulic chamber composed of a sleeve and a plunger; the power chamber is driven by a power machine, which pushes the hydraulic oil to act on the diaphragm, causing the diaphragm to reciprocate continuously; The upper inlet pipe is an inclined upper inlet pipe, and the lower inlet pipe is an inclined lower inlet pipe; When the diaphragm is compressed, the two-phase fluid leaves the working chamber from the upper outlet, and a circulating flow is formed at the lower double inlet. The fluid flow above the inlet ball valve is disturbed to prevent particles from settling and clogging the ball valve.

2. The diaphragm pump for conveying solid-liquid two-phase flow according to claim 1, characterized in that: Both ends of the upper and lower inlet pipes are equipped with filter screens to block the flow of particles.

3. The diaphragm pump for conveying solid-liquid two-phase flow according to claim 2, characterized in that: When the diaphragm expands, the pressure in the working chamber drops sharply. The pressure difference drives the fluid carrying particles through the inlet ball valve and into the working chamber from the upper and lower inlet pipes. Due to the presence of the filter screen, only the fluid passes through the upper and lower inlet pipes. The two phases enter the pump chamber in an oblique jet. The fluid at the lower inlet jets upwards and merges with the two-phase fluid, mitigating the impact force. When the diaphragm compresses, the pressure in the working chamber increases significantly, creating a large pressure difference with both the area below the inlet ball valve and the area above the outlet ball valve. This forces the inlet ball valve to close and the outlet ball valve to open.

4. The diaphragm pump for conveying solid-liquid two-phase flow according to claim 1, characterized in that: Both the inlet and outlet ball valves are one-way valves consisting of a weighted ball and a valve chamber.

5. The diaphragm pump for conveying solid-liquid two-phase flow according to claim 1, characterized in that: The upper inlet pipe is arranged at a 45° angle to introduce the solid-liquid two-phase fluid.

6. The diaphragm pump for conveying solid-liquid two-phase flow according to claim 1, characterized in that: The inlet pipe is inclined at 30° to allow liquid to enter.

7. The diaphragm pump for conveying solid-liquid two-phase flow according to claim 1, characterized in that: The safety valve is a spring-loaded safety valve.

8. The diaphragm pump for conveying solid-liquid two-phase flow according to claim 1, characterized in that: The diaphragm is a flat diaphragm made of oil-resistant rubber and polytetrafluoroethylene bonded together.

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