An abrasion-resistant coal slurry feed diaphragm pump

Abstract

The utility model discloses an abrasion -resistant coal water slurry feed diaphragm pump relates to coal water slurry conveying technical field, including fixed base, four pump body housings are fixedly connected through the fixed stand on the fixed base, both ends of each pump body housing are fixedly connected with fixed end cover in thread, and both sides fixed end cover correspond fixedly connected with inner hose diaphragm and outer hose diaphragm between pump body housing inner chamber, the inner hose diaphragm is inserted to the center of outer hose diaphragm, and one side fixed end cover is buried with pressure sensor between annular gap end position between inner hose diaphragm and outer hose diaphragm, and the structure of double hose diaphragm makes the coal water slurry that is transported only with inner hose diaphragm inside and modular one -way valve contact, and is completely isolated with the pump cavity of pump body housing. Effectively avoid the corrosion and abrasion of the pump cavity of pump body housing to coal water slurry. The deformation of inner hose diaphragm and outer hose diaphragm is closer to the expansion and shrinkage of radial, avoids stress concentration, and makes fatigue life greatly improve.

Description

Technical Field

[0001] This utility model relates to the field of coal slurry conveying technology, specifically to a wear-resistant coal slurry feeding diaphragm pump. Background Technology

[0002] As a core conveying equipment in coal chemical and coal gasification processes, the performance of coal slurry diaphragm pumps directly affects the continuity and stability of the entire production system. Currently, the diaphragm pumps commonly used in the industry mainly include two types: double-cylinder double-acting and triple-cylinder single-acting. Driven by an electric motor and a crankshaft connecting rod mechanism, the diaphragm reciprocates within the pump body, creating negative and positive pressures to complete the intake and discharge of coal slurry. The basic principle of these pumps is to use a diaphragm to isolate the conveyed medium from the pump's moving parts, theoretically reducing direct wear of abrasive media on internal components. However, in practical industrial applications, especially when dealing with complex media such as coal-water slurry that are highly abrasive, highly viscous, and contain solid particles, traditional diaphragm pumps exhibit numerous limitations. Existing diaphragm pumps typically employ a flat-plate diaphragm design at the hydraulic end. This results in complex flow directions of the medium within the diaphragm cavity, creating dead zones that easily lead to the sedimentation and accumulation of solid particles in the coal slurry, exacerbating diaphragm wear. Furthermore, there is a lack of monitoring methods for diaphragm wear and leakage, often resulting in problems only being discovered when serious leaks disrupt production. At this point, not only are repair costs high, but production interruptions also occur, causing significant economic losses to the enterprise. Therefore, we propose a wear-resistant and corrosion-resistant coal slurry feed diaphragm pump. Utility Model Content

[0003] The purpose of this invention is to address the problems of existing diaphragm pumps, which typically use a flat diaphragm design at the hydraulic end. This design results in complex flow directions of the medium within the diaphragm cavity, creating dead zones that easily lead to the sedimentation and accumulation of solid particles in the coal slurry, exacerbating diaphragm wear. Furthermore, the lack of monitoring methods for diaphragm wear and leakage means that leaks are often only discovered when serious leaks affect production. This not only leads to high maintenance costs but also production interruptions and significant economic losses for enterprises. This invention provides a wear-resistant coal slurry feed diaphragm pump.

[0004] To achieve the above objectives, this utility model specifically adopts the following technical solution: A wear-resistant coal slurry feeding diaphragm pump includes a fixed base. Four pump body shells are fixedly connected to the fixed base via a fixed bracket. Each pump body shell has a fixed end cap threaded to both ends. An inner hose diaphragm and an outer hose diaphragm are fixedly connected between the two fixed end caps and the inner cavity of the pump body shell. The inner hose diaphragm is inserted into the center of the outer hose diaphragm. A pressure sensor is embedded at the end of the annular gap between the inner and outer hose diaphragms on one side of the fixed end cap. An end connector is provided at the center of the outer side of each fixed end cap. A modular one-way valve is threaded to the center of the inner cavity of the end connector. A hydraulic drive end is provided at the center of the outer side of multiple pump body shells. A four-crankshaft power end is provided on the fixed base corresponding to the hydraulic drive end.

[0005] Furthermore, the hydraulic drive end includes a hydraulic cylinder liner, which is connected to the inner cavity of the pump body housing, and a hydraulic piston rod is movably inserted into the hydraulic cylinder liner. The gap between the outer side of the outer hose diaphragm and the inner side of the hydraulic piston rod in the inner cavity of the pump body housing is filled with hydraulic oil.

[0006] Furthermore, the power end of the four-crankshaft includes multiple four-crankshafts rotatably mounted on a fixed stand. Each four-crankshaft has a drive crank corresponding to a multiple hydraulic cylinder liner position, and a transmission connecting rod is rotatably sleeved on the outer end of the drive crank. The end of the transmission connecting rod away from the drive crank is hinged to the outer end of the hydraulic piston rod at the corresponding position.

[0007] Furthermore, the power end of the four-crankshaft also includes a drive geared motor, which is fixedly installed on the upper side of the fixed base, and the output shaft of the drive geared motor and the end of the four-crankshaft are connected and transmitted through a transmission gear.

[0008] Furthermore, the outer end of the end connector is provided with a flange connection plate, and the adjacent pump body shells are connected by the flange connection plate of the outer end connector, and the pump body shells at both ends are connected to the conveying pipeline by the flange connection plate of the outer end connector.

[0009] Furthermore, the inner and outer flexible diaphragms are made of ultra-high molecular weight polyethylene and lined with reinforcing elastic fibers.

[0010] The beneficial effects of this utility model are as follows: 1. The double-hose diaphragm structure of this utility model ensures that the coal slurry being transported only comes into contact with the inner side of the inner hose diaphragm and the modular one-way valve, completely isolating it from the pump chamber of the pump body shell. This effectively avoids corrosion and wear of the pump chamber by the coal slurry.

[0011] 2. The movement of the inner flexible hose diaphragm in this invention is more in line with the principles of fluid dynamics. Pressure is transmitted through hydraulic oil, causing periodic deformation of both the inner and outer flexible hose diaphragms. Unlike the large-scale tensile deformation of traditional flat diaphragms, the deformation of the inner and outer flexible hose diaphragms is closer to radial expansion and contraction, avoiding stress concentration and significantly improving fatigue life.

[0012] 3. In this invention, the gap between the inner and outer flexible diaphragms is maintained in a vacuum state, ensuring a tight fit between the two diaphragms. If the inner flexible diaphragm ruptures, coal slurry will enter the annular gap, triggering a pressure sensor alarm; the outer flexible diaphragm will still maintain normal operation, the system will not fail immediately, and the pump can continue to operate as a traditional diaphragm pump, providing a time window for planned maintenance and greatly improving system reliability. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention; Figure 2 This is a front sectional view of the present invention; Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle; Figure 4 This is a side sectional view of the present invention.

[0014] In the attached diagram: 1. Fixed base; 2. Fixed support frame; 3. Pump body shell; 4. Fixed end cover; 5. Inner hose diaphragm; 6. Outer hose diaphragm; 7. End connector; 8. Modular check valve; 9. Four-crankshaft; 10. Hydraulic cylinder liner; 11. Hydraulic piston rod; 12. Transmission connecting rod; 13. Drive crank; 14. Transmission gear; 15. Drive geared motor. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0016] Please see Figure 1 - Figure 4This utility model provides a wear-resistant coal slurry feeding diaphragm pump, including a fixed base 1. Four pump body shells 3 are fixedly connected to the fixed base 1 via a fixed bracket 2. Each pump body shell 3 has a fixed end cap 4 threaded to both ends. An inner flexible diaphragm 5 and an outer flexible diaphragm 6 are fixedly connected between the two fixed end caps 4 and the inner cavity of the pump body shell 3. The inner flexible diaphragm 5 is inserted into the center of the outer flexible diaphragm 6. A pressure sensor is embedded at the end of the annular gap between the inner flexible diaphragm 5 and the outer flexible diaphragm 6 on one side of the fixed end cap 4. An end connecting seat 7 is provided at the center of the outer side of each fixed end cap 4. A modular one-way valve 8 is threaded to the center of the inner cavity of the end connecting seat 7. A hydraulic drive end is provided at the center of the outer side of multiple pump body shells 3. A four-crankshaft power end is provided on the fixed base 1 corresponding to the hydraulic drive end.

[0017] Employing a four-cylinder single-acting design, the traditional flat diaphragm chamber is replaced with a straight-through double-hose diaphragm structure consisting of an inner hose diaphragm 5 and an outer hose diaphragm 6 nested together. This allows the coal slurry to flow in a straight line within the pump, minimizing flow resistance and the possibility of particle settling. A four-crankshaft power end drives the hydraulic drive end in reciprocating motion, causing the double-hose diaphragm structure to contract and expand via hydraulic oil. This allows for the unidirectional intake and discharge of coal slurry through modular check valves 8 at both ends, ensuring continuous slurry delivery. The discharge phase difference between the four pump housings 3 is 90 degrees, resulting in a more uniform and stable flow rate and reduced pulse amplitude. Compared to traditional diaphragm pumps, the double-hose diaphragm structure ensures that the transported coal slurry only contacts the inner side of the inner hose diaphragm 5 and the modular check valve 8, completely isolating it from the pump chamber of the pump housing 3. This effectively prevents corrosion and wear of the pump chamber by the coal slurry. Furthermore, the movement of the inner hose diaphragm 5 conforms to fluid dynamics principles, transmitting pressure through hydraulic oil to cause periodic deformation of both the inner and outer hose diaphragms 6. Unlike traditional flat diaphragm pumps that undergo significant tensile deformation, the deformation of the inner flexible hose diaphragm 5 and the outer flexible hose diaphragm 6 is closer to radial expansion and contraction, avoiding stress concentration and significantly improving fatigue life. The gap between the inner and outer flexible hose diaphragms maintains a vacuum state, ensuring a tight fit between the two layers. If the inner flexible hose diaphragm ruptures, coal slurry will enter the annular gap, triggering a pressure sensor alarm; the outer flexible hose diaphragm will still maintain normal operation, preventing immediate system failure. The pump can continue to operate as a traditional diaphragm pump, providing a window for planned maintenance and greatly improving system reliability.

[0018] In this embodiment, preferably, the hydraulic drive end includes a hydraulic cylinder liner 10, which communicates with the inner cavity of the pump body housing 3. A hydraulic piston rod 11 is movably inserted into the hydraulic cylinder liner 10. The gap between the outer side of the outer hose diaphragm 6 and the inner side of the hydraulic piston rod 11 in the inner cavity of the pump body housing 3 is filled with hydraulic oil. Through the cooperation of the hydraulic cylinder liner 10 and the hydraulic piston rod 11, and the filling of hydraulic oil, a complete hydraulic drive system is formed. Driven by the four-crankshaft power end, the hydraulic piston rod 11 reciprocates, thereby transmitting power to the inner hose diaphragm 5 and the outer hose diaphragm 6 through the hydraulic oil, causing them to undergo periodic deformation, thus realizing the intake and discharge of coal slurry. This design not only improves the pump's wear resistance but also makes the pump operation more stable and reliable. At the same time, the filling of hydraulic oil also plays a role in lubrication and cooling, further extending the service life of the pump.

[0019] In this embodiment, preferably, the four-crankshaft power end includes a four-crankshaft 9 rotatably mounted on multiple fixed supports 2. Drive cranks 13 are provided on the four-crankshaft 9 corresponding to multiple hydraulic cylinder liners 10, and a transmission connecting rod 12 is rotatably sleeved on the outer end of the drive crank 13. The end of the transmission connecting rod 12 away from the drive crank 13 is hinged to the outer end of the hydraulic piston rod 11 at the corresponding position. Through this structural design, during the rotation of the four-crankshaft 9, the drive cranks 13 drive the transmission connecting rod 12 to reciprocate, thereby pushing or pulling the hydraulic piston rod 11 to perform linear reciprocating motion within the hydraulic cylinder liners 10. This transmission method is not only compact and efficient, but also ensures smooth and shock-free movement of the hydraulic piston rod 11, effectively reducing wear and malfunctions caused by mechanical vibration. Simultaneously, the multiple fixed supports 2 enhance the structural strength and stability of the entire power end, enabling the pump to maintain high reliability and durability during long-term operation.

[0020] In this embodiment, preferably, the power end of the four-crankshaft also includes a drive geared motor 15. The drive geared motor 15 is fixedly installed on the upper side of the fixed base 1, and the output shaft of the drive geared motor 15 and the end of the four-crankshaft 9 are connected and transmitted through a transmission gear 14. As the source of the entire power system, the drive geared motor 15 provides a stable and adjustable power input to the four-crankshaft 9. Through the connection of the transmission gear 14, the drive geared motor 15 can accurately and efficiently transmit its rotational motion to the four-crankshaft 9, ensuring that the four-crankshaft 9 rotates at a predetermined speed and direction. This design not only makes the power source of the pump more reliable, but also allows for convenient control of the pump's flow rate and pressure by adjusting the speed of the drive geared motor 15, thereby meeting the usage requirements under different working conditions. At the same time, the fixed installation method of the drive geared motor 15 also ensures its stability and safety during operation, effectively avoiding malfunctions and accidents caused by motor vibration.

[0021] In this embodiment, preferably, a flange connection plate is provided at the outer end of the end connecting seat 7, and adjacent pump body shells 3 are connected by the flange connection plate on the outer side of the end connecting seat 7. The pump body shells 3 at both ends are connected to the conveying pipeline through the flange connection plate on the outer side of the end connecting seat 7. By providing a flange connection plate at the outer end of the end connecting seat 7, a reliable connection between adjacent pump body shells 3 and convenient docking with the conveying pipeline are achieved. This flange connection method has the advantages of high connection strength and good sealing performance, which can effectively prevent leakage of coal slurry during transportation. At the same time, the flange connection design also facilitates the installation, disassembly and maintenance of the pump body. When it is necessary to repair or replace a pump body shell 3, it is only necessary to loosen the corresponding flange bolts, which greatly improves work efficiency and maintainability. Moreover, this connection method can also adapt to conveying pipelines of different diameters and materials, enhancing the versatility and flexibility of the pump, enabling it to better meet the needs of various actual working conditions.

[0022] In this embodiment, preferably, the inner hose diaphragm 5 and the outer hose diaphragm 6 are made of ultra-high molecular weight polyethylene (UHMWPE) material, lined with reinforcing elastic fibers. UHMWPE material possesses excellent wear resistance, impact resistance, and corrosion resistance, enabling the inner hose diaphragm 5 and the outer hose diaphragm 6 to exhibit excellent durability and stability when facing highly abrasive, high-viscosity coal-water slurry containing solid particles. The reinforcing elastic fibers in the lining further enhance the diaphragm's elasticity and fatigue resistance, allowing it to maintain good deformation recovery and structural integrity even under long-term hydraulic oil pressure and coal slurry impact. This material combination not only effectively extends the diaphragm's service life and reduces the frequency of maintenance and replacement due to diaphragm wear, but also lowers the risk of production interruption caused by diaphragm rupture.

[0023] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wear-resistant coal slurry feed diaphragm pump, characterized in that: The system includes a fixed base (1), on which four pump housings (3) are fixedly connected by a fixed bracket (2). Each pump housing (3) has a fixed end cap (4) threaded to both ends. The two fixed end caps (4) are fixedly connected to the inner cavity of the pump housing (3) with an inner hose diaphragm (5) and an outer hose diaphragm (6). The inner hose diaphragm (5) is inserted into the center of the outer hose diaphragm (6). A pressure sensor is embedded at the end of the annular gap between the inner hose diaphragm (5) and the outer hose diaphragm (6) on one side of the fixed end cap (4). An end connector (7) is provided at the center of the outer side of each fixed end cap (4). A modular one-way valve (8) is threaded to the center of the inner cavity of the end connector (7). A hydraulic drive end is provided at the center of the outer side of multiple pump housings (3). A four-crankshaft power end is provided on the fixed base (1) corresponding to the hydraulic drive end.

2. The wear-resistant coal slurry feed diaphragm pump according to claim 1, characterized in that: The hydraulic drive end includes a hydraulic cylinder liner (10), which is connected to the inner cavity of the pump body housing (3), and a hydraulic piston rod (11) is movably inserted into the hydraulic cylinder liner (10). The gap between the outer side of the outer hose diaphragm (6) and the inner side of the hydraulic piston rod (11) in the inner cavity of the pump body housing (3) is filled with hydraulic oil.

3. The wear-resistant coal slurry feed diaphragm pump according to claim 2, characterized in that: The power end of the four-crankshaft includes a four-crankshaft (9) rotatably mounted on a plurality of fixed supports (2). A drive crank (13) is provided on the four-crankshaft (9) corresponding to the positions of a plurality of hydraulic cylinder liners (10). A transmission connecting rod (12) is sleeved and rotated on the outer end of the drive crank (13). The end of the transmission connecting rod (12) away from the drive crank (13) is hinged to the outer end of the hydraulic piston rod (11) at the corresponding position.

4. The wear-resistant coal slurry feed diaphragm pump according to claim 3, characterized in that: The power end of the four-crankshaft also includes a drive reduction motor (15), which is fixedly installed on the upper side of the fixed base (1), and the output shaft of the drive reduction motor (15) and the end of the four-crankshaft (9) are connected and transmitted through a transmission gear (14).

5. The wear-resistant coal slurry feed diaphragm pump according to claim 1, characterized in that: The outer end of the end connecting seat (7) is provided with a flange connecting plate, and the adjacent pump body shell (3) is connected by the flange connecting plate of the outer side of the end connecting seat (7). The pump body shell (3) at both ends is connected to the conveying pipeline by the flange connecting plate of the outer side of the end connecting seat (7).

6. The wear-resistant coal slurry feed diaphragm pump according to claim 1, characterized in that: The inner hose diaphragm (5) and the outer hose diaphragm (6) are made of ultra-high molecular weight polyethylene material and lined with reinforcing elastic fibers.

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