A hydraulic end for a double cylinder double acting diaphragm pump

Abstract

The utility model discloses a kind of for double-cylinder double-acting diaphragm pump's fluid end, to provide a kind of more reasonable, efficient, enhance the installation structure of the service life of double-cylinder double-acting diaphragm pump left, right fluid end, its technical scheme main point is including pump body pedestal, left fluid end and right fluid end are symmetrically equipped in the mounting area on the pump body pedestal, left fluid end and right fluid end are equipped with with cylinder body, hose diaphragm assembly, membrane cavity and import and export valve group, left fluid end and right fluid end are equipped with double exhaust device, double exhaust device includes the gas safety valve of being installed on the upside of cylinder body and the auxiliary exhaust valve of being arranged on the upside of membrane cavity, for discharging gas generated when fluid end operates. The utility model is applicable to fluid end technical field.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic end technology, and more specifically, it relates to a hydraulic end for a double-cylinder double-acting diaphragm pump. Background Technology

[0002] Double-cylinder, double-acting diaphragm pumps are widely used in industrial fluid transportation, capable of conveying media such as high-viscosity, corrosive, and slurries containing solid particles. However, existing pumps have many shortcomings in their left and right hydraulic end mounting structures and related designs.

[0003] Traditional plunger structures result in inconsistent volume changes between the left and right chambers, causing significant flow pulsations and affecting delivery stability and the lifespan of downstream equipment. Poorly designed hydraulic chamber venting devices can lead to diaphragm rupture due to inadequate venting; and the lack of precise control in the oil replenishment system can cause excessive or insufficient oil replenishment, impacting pump performance.

[0004] When conveying slurry, the pump head diaphragm cavity is prone to sedimentation and blockage, increasing operating resistance and clearance volume. In addition, expensive materials are required to adapt to corrosive media. The buffer is prone to blockage when handling media with high solid content, and the dynamic seal structure increases the risk of leakage. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a more reasonable, efficient and service-enhancing installation structure for the left and right hydraulic ends of a double-cylinder double-acting diaphragm pump.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic end for a double-cylinder double-acting diaphragm pump, comprising a pump body base, wherein a left hydraulic end and a right hydraulic end are symmetrically arranged in the mounting area on the pump body base, and each of the left and right hydraulic ends is provided with a cylinder, a hose diaphragm assembly, a membrane cavity, and an inlet and outlet valve group, and each of the left and right hydraulic ends is provided with a dual exhaust device, wherein the dual exhaust device includes a venting safety valve installed on the upper side of the cylinder and an auxiliary exhaust valve installed on the upper side of the membrane cavity, for discharging the gas generated during the operation of the hydraulic end.

[0007] The present invention is further configured such that: the inlet and outlet valve group includes an inlet and an outlet disposed at both ends of the membrane cavity, and a one-way valve disposed within the outlet and the inlet.

[0008] The present invention is further configured such that the upper surface of the valve seat of the one-way valve adopts a slope anti-settling structure to prevent slurry from settling and accumulating on the upper surface of the valve seat.

[0009] The present invention is further configured such that: the cylinder body is provided with two parallel chambers, a plunger penetrating the two chambers, and a plunger sleeve adapted to the plunger at one end; the plunger adopts a structure with rods at both ends to ensure that the volume change of the left and right chambers is consistent, so as to reduce the flow pulsation rate.

[0010] The present invention is further configured such that: a lower adjustable limit oil replenishing device is provided at the lower end of the cylinder body, and the opening pressure of the oil replenishing valve is adjusted according to the inlet working conditions to prevent excessive oil replenishment; the oil replenishing valve of the oil replenishing device is installed at the lowest end of the cylinder body so that the oil replenishing channel is always below the liquid surface to prevent air from being sucked in.

[0011] The present invention is further configured such that the inner wall of the membrane cavity is polished to reduce the friction between the hose diaphragm and the inner wall of the cylinder.

[0012] The present invention is further configured such that: the hydraulic end is also provided with a transmission connection assembly, the transmission connection assembly including a motor that provides power, a worm gear, a double eccentric wheel shaft, a crank, a connecting rod, and a crosshead connected to the plunger. The motor reduces speed through the worm gear, drives the double eccentric wheel shaft to rotate, and then converts the rotation into the reciprocating motion of the crosshead through the crank and connecting rod.

[0013] The beneficial effects of this utility model are:

[0014] 1. The left and right hydraulic ends are symmetrically arranged within the pump base mounting area, ensuring uniform force distribution during pump operation. This significantly reduces vibration and swaying, lowers the risk of wear and failure caused by unbalanced forces, effectively extends the pump's service life, and substantially saves on maintenance and replacement costs for the company. The cylinders, hose-diaphragm assemblies, diaphragm chambers, and inlet / outlet valve assemblies on the left and right hydraulic ends work together to form a highly efficient operating system. The cylinders provide a stable working space, forming a solid foundation for pump operation; the hose-diaphragm assemblies precisely control liquid flow, ensuring delivery efficiency and accuracy; the diaphragm chambers create a suitable environment for liquid flow; and the inlet / outlet valve assemblies precisely regulate liquid inflow and outflow, ensuring a smooth and efficient pump operation. The venting safety valve is installed on the upper side of the cylinder body, and the auxiliary venting valve is located on the upper side of the diaphragm chamber. If the gas generated during hydraulic operation is not discharged in time, it will accumulate and cause abnormal pressure, which may lead to serious consequences such as rupture of the hose diaphragm. The venting safety valve automatically opens when the gas pressure in the cylinder body is too high to discharge excess gas and ensure stable cylinder pressure. The auxiliary venting valve further discharges gas from the diaphragm chamber, effectively preventing rupture of the hose diaphragm and improving the reliability and safety of the pump.

[0015] 2. The inlet and outlet valve assembly consists of inlet and outlet ports at both ends of the diaphragm chamber, as well as check valves within the inlet and outlet ports, ensuring the orderly flow of liquid within the pump. The check valve restricts liquid flow to one direction only, preventing backflow and effectively improving the pump's delivery efficiency and operational stability. Furthermore, the sloping anti-settling structure on the upper surface of the check valve seat prevents impurities and particles in the slurry from accumulating and settling when conveying liquids such as slurries. If the upper surface of the valve seat were a flat surface, slurry accumulation would severely affect the seal between the valve ball and the valve seat, leading to liquid leakage, reduced pump efficiency, and even preventing the pump from operating normally.

[0016] 3. The cylinder body features two parallel chambers and a rod-type plunger penetrating both chambers, enhancing the stability and efficiency of cylinder operation. The rod-type plunger ensures consistent volume changes in both chambers, resulting in more stable flow output during operation. Reduced flow pulsation means less pressure fluctuation in the hydraulic system, minimizing impact and damage to other components. A bottom-mounted adjustable limit oil replenishment device at the lower end of the cylinder body adjusts the opening pressure of the replenishment valve according to inlet conditions, offering strong adaptability and flexibility. As inlet conditions change, adjusting the replenishment valve opening pressure allows for precise control of the replenishment amount, preventing over-replenishment. The replenishment valve is located at the very bottom of the cylinder body, ensuring the replenishment channel is always below the liquid level, effectively preventing air from being drawn into the system. Air in a hydraulic system causes cavitation, reducing system efficiency, damaging hydraulic components, and even leading to system failure.

[0017] 4. Polishing the inner wall of the diaphragm cavity significantly reduces friction between the hose diaphragm and the inner wall of the cylinder. On one hand, reduced friction decreases diaphragm wear, extends its service life, and reduces replacement frequency, thereby lowering equipment maintenance costs and downtime. On the other hand, lower friction also helps improve equipment operating efficiency and reduce energy loss. The hydraulic transmission connection assembly consists of a motor, worm gear, double eccentric shaft, crank, connecting rod, and crosshead. The motor serves as the power source, and the worm gear reduces speed. Worm gear transmission features a large transmission ratio and self-locking properties, converting the high-speed rotation of the motor into a suitable low-speed output, providing stable and appropriate power for subsequent motion conversion. The double eccentric shaft rotates under the drive of the worm gear, and its eccentric structure converts circular motion into complex and orderly oscillation. Then, the crank and connecting rod further convert this oscillation into the reciprocating motion of the crosshead. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a partial sectional view of the present invention;

[0020] Figure 3 This is a cross-sectional view of the hydraulic end;

[0021] Figure 1-3Reference numerals in the attached diagram: 1. Pump body base; 2. Left hydraulic end; 3. Right hydraulic end; 4. Cylinder; 5. Diaphragm chamber; 6. Vent safety valve; 7. Auxiliary vent valve; 8. Inlet; 9. Outlet; 10. Check valve; 11. Chamber; 12. Plunger; 13. Plunger sleeve; 14. Oil replenishment device; 15. Motor; 16. Double eccentric wheel shaft; 17. Crosshead; 18. Worm gear. Detailed Implementation

[0022] Reference Figures 1 to 3 The embodiments of this utility model will be further described below.

[0023] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0025] Figures 1 to 3The hydraulic end of a double-cylinder, double-acting diaphragm pump, shown, includes a pump body base 1. A left hydraulic end 2 and a right hydraulic end 3 are symmetrically arranged within the mounting area of ​​the pump body base 1, ensuring uniform force distribution during pump operation. This significantly reduces vibration and swaying, lowers the risk of wear and failure caused by unbalanced forces on components, effectively extends the pump's service life, and substantially saves on maintenance and replacement costs for enterprises. Both the left hydraulic end 2 and the right hydraulic end 3 are equipped with a cylinder body 4, a hose-and-diaphragm assembly, a diaphragm chamber 5, and inlet / outlet valve assemblies, forming a highly efficient working system. The cylinder body 4 provides a stable working space, serving as a solid foundation for pump operation; the hose-and-diaphragm assembly precisely controls liquid flow, ensuring delivery efficiency and accuracy; the diaphragm chamber 5 creates a suitable environment for liquid flow; and the inlet / outlet valve assemblies precisely regulate liquid inflow and outflow, ensuring a smooth and efficient pump operation. Both the left hydraulic end 2 and the right hydraulic end 3 are equipped with dual exhaust devices. The dual exhaust devices include a venting safety valve 6 installed on the upper side of the cylinder 4 and an auxiliary exhaust valve 7 installed on the upper side of the diaphragm chamber 5. If the gas generated during the operation of the hydraulic end is not discharged in time, it will accumulate and cause abnormal pressure, which may lead to serious consequences such as rupture of the hose diaphragm. The venting safety valve 6 automatically opens when the gas pressure in the cylinder 4 is too high to discharge excess gas and ensure that the pressure in the cylinder 4 is stable. The auxiliary exhaust valve 7 further discharges the gas in the diaphragm chamber 5, effectively preventing the hose diaphragm from rupturing and improving the reliability and safety of the pump.

[0026] The inlet and outlet valve assembly includes an inlet 8 and an outlet 9 located at both ends of the diaphragm chamber 5, and a one-way valve 10 located within the outlet 9 and the inlet 8, ensuring the orderly flow of liquid within the pump. The one-way valve 10 restricts the liquid to flow in only one direction, preventing backflow and effectively improving the pump's delivery efficiency and operational stability.

[0027] The upper surface of the valve seat of the one-way valve 10 adopts a sloping anti-settling structure, which can prevent impurities and particles in the slurry from settling and accumulating when conveying liquids such as slurries. If the upper surface of the valve seat is a normal flat surface, slurry accumulation will seriously affect the sealing performance between the valve ball and the valve seat, leading to liquid leakage, reducing the working efficiency of the pump, or even causing the pump to fail to operate normally.

[0028] The cylinder body 4 has two parallel chambers 11, a plunger 12 passing through the two chambers 11, and a plunger 12 sleeve at one end that is adapted to the plunger 12. The plunger 12 adopts a rod structure at both ends to ensure that the volume change of the left and right chambers is consistent. In actual operation, the consistency of volume change makes the output flow of the cylinder body 4 more stable. The reduction of flow pulsation rate means that the pressure fluctuation of the hydraulic system is reduced, thereby reducing the impact and damage to other components in the system.

[0029] The lower end of the cylinder body 4 is equipped with a bottom-mounted adjustable limit oil replenishment device 14, which can adjust the opening pressure of the oil replenishment valve according to the inlet working conditions. It has strong adaptability and flexibility. Under different working conditions, the inlet working conditions will change. By adjusting the opening pressure of the oil replenishment valve, the oil replenishment amount can be precisely controlled to prevent excessive oil replenishment. The oil replenishment valve of the oil replenishment device 14 is installed at the lowest end of the cylinder body 4, so that the oil replenishment channel is always below the liquid surface, effectively preventing air from being drawn into the system. In the hydraulic system, the presence of air will cause cavitation, reduce the system's working efficiency, damage hydraulic components, and even lead to system failure.

[0030] The inner walls of the membrane cavity 5 are all polished to reduce friction between the hose diaphragm and the inner wall of the cylinder 4. On the one hand, reducing friction can reduce wear on the hose diaphragm, extend its service life, and reduce the frequency of replacement, thereby reducing equipment maintenance costs and downtime. On the other hand, smaller friction also helps to improve the operating efficiency of the equipment and reduce energy loss.

[0031] The hydraulic end is also equipped with a transmission connection assembly, which includes a motor 15 providing power, a worm gear 18, a double eccentric shaft 16, a crank, a connecting rod, and a crosshead 17 connected to the plunger 12. The motor 15 serves as the power source, and the worm gear 18 reduces speed. The worm gear 18 transmission has the characteristics of a large transmission ratio and self-locking, which can convert the high-speed rotation of the motor 15 into a suitable low-speed output, providing stable and appropriate power for subsequent motion conversion. The double eccentric shaft 16 rotates under the drive of the worm gear 18, and its eccentric structure can convert circular motion into complex and orderly oscillation. Then, the crank and connecting rod further convert this oscillation into the reciprocating motion of the crosshead 17. The crosshead 17 is connected to the plunger 12, and its reciprocating motion can precisely drive the plunger 12 to make linear motion within the cylinder 4, realizing the functions of oil suction and oil discharge of the equipment.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic end for a double-cylinder, double-acting diaphragm pump, comprising a pump body base (1), characterized in that, The pump body base (1) is symmetrically provided with a left hydraulic end (2) and a right hydraulic end (3) in the installation area. The left hydraulic end (2) and the right hydraulic end (3) are provided with a cylinder (4), a hose diaphragm assembly, a membrane chamber (5) and an inlet and outlet valve group. The left hydraulic end (2) and the right hydraulic end (3) are provided with a dual exhaust device. The dual exhaust device includes a venting safety valve (6) installed on the upper side of the cylinder (4) and an auxiliary exhaust valve (7) installed on the upper side of the membrane chamber (5) for discharging the gas generated when the hydraulic end is running.

2. The hydraulic end of a double-cylinder double-acting diaphragm pump according to claim 1, characterized in that, The inlet and outlet valve assembly includes an inlet (8) and an outlet (9) located at both ends of the membrane cavity (5), and a one-way valve (10) located in the outlet (9) and the inlet (8).

3. The hydraulic end of a double-cylinder double-acting diaphragm pump according to claim 2, characterized in that, The upper surface of the valve seat of the one-way valve (10) adopts a slope anti-settling structure to prevent slurry from settling and accumulating on the upper surface of the valve seat.

4. The hydraulic end of a double-cylinder double-acting diaphragm pump according to claim 1, characterized in that, The cylinder (4) is provided with two parallel chambers (11), a plunger (12) passing through the two chambers (11), and a plunger (12) sleeve that is adapted to the plunger (12) at one end. The plunger (12) adopts a rod structure at both ends to ensure that the volume change of the left and right chambers is consistent.

5. The hydraulic end of a double-cylinder double-acting diaphragm pump according to claim 1, characterized in that, The lower end of the cylinder (4) is provided with a lower adjustable limit oil replenishing device (14), and the opening pressure of the oil replenishing valve is adjusted according to the inlet working conditions to prevent excessive oil replenishment. The oil replenishing valve of the oil replenishing device (14) is installed at the lowest end of the cylinder (4) so ​​that the oil replenishing channel is always below the liquid surface to prevent air from being sucked in.

6. The hydraulic end of a double-cylinder double-acting diaphragm pump according to claim 1, characterized in that, The inner walls of the membrane cavity (5) are all polished to reduce friction between the hose diaphragm and the inner wall of the cylinder (4).

7. The hydraulic end of a double-cylinder double-acting diaphragm pump according to claim 4, characterized in that, The hydraulic end is also provided with a transmission connection assembly, which includes a motor (15) that provides power, a worm gear (18), a double eccentric wheel shaft (16), a crank, a connecting rod, and a crosshead (17) connected to the plunger (12). The motor (15) reduces speed through the worm gear (18), drives the double eccentric wheel shaft (16) to rotate, and then converts the rotation into the reciprocating motion of the crosshead (17) through the crank and connecting rod.

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