Low-pressure corrosion-resistant diaphragm pump fluid end

Abstract

The invention belongs to the technical field of low-pressure corrosion-resistant diaphragm pumps, and particularly relates to a three-cylinder single-action low-pressure corrosion-resistant diaphragm pump fluid end. According to the low-pressure corrosion-resistant diaphragm pump fluid end, the structure is reasonable, the overall length of equipment is reduced, the structure of an overflowing part is optimized, and the manufacturing cost of the fluid end is reduced. The device comprises a diaphragm chamber, and is characterized in that an inlet and an outlet of the diaphragm chamber are respectively provided with a valve box; the valve box comprises a box body, the lower end of the box body is an inlet, and the upper end of the box body is an outlet; a discharging box cover is arranged at an outlet of the box body, a discharging through hole is formed in the discharging box cover, a one-way valve matched with an inlet of the box body is arranged in the box body, and the fixed end of the one-way valve is fixedly connected with the box cover; the outlet end of a valve box is connected with the inlet end of the diaphragm chamber to serve as a feeding valve box; and the inlet end of the other valve box is connected with the outlet end of the diaphragm chamber to serve as a discharging valve box.

Description

Technical Field

[0001] The invention belongs to the technical field of low-pressure corrosion-resistant diaphragm pumps, and in particular relates to a hydraulic end of a three-cylinder single-acting low-pressure corrosion-resistant diaphragm pump. Background Art

[0002] The hydraulic end is the flow-through part of the diaphragm pump for the medium to be transported, and is an important component of the three-cylinder single-acting low-pressure corrosion-resistant diaphragm pump. After the driving force of the power end is transmitted to the hydraulic end through the piston rod, the piston in the oil cylinder performs reciprocating linear motion, and the oil between the piston and the diaphragm drives the diaphragm to perform concave-convex reciprocating motion, thereby causing the feed valve and the discharge valve to open and close alternately to achieve the transportation of the slurry.

[0003] Low-pressure corrosion-resistant diaphragm pumps operate in an acidic environment. The structure of the hydraulic end and the processing method of the wetted parts are directly related to the service life of the wetted parts and the continuous operation rate of the user's equipment, which in turn affects the user's profit level.

[0004] At present, three-cylinder single-acting diaphragm pumps such as Figure 5-6 As shown, it generally includes a feed main pipe, a feed valve box, an elbow, a diaphragm chamber, a discharge valve box, a discharge main pipe and other flow parts and a cylinder. After the slurry flows into the feed main pipe, it flows upward into the feed valve box, flows into the elbow from the side of the feed valve box, flows into the diaphragm chamber from the top of the elbow, flows into the discharge valve box from the top of the diaphragm chamber, and flows into the discharge main pipe from the side of the discharge valve box, and is transported to the pipeline.

[0005] This structure has the following disadvantages: (1) The feed valve box is located outside the front of the diaphragm chamber, which makes the overall length of the hydraulic end larger, resulting in a large footprint for the entire machine, high construction costs, and inconvenient transportation. (2) When the slurry flows in from the bottom of the feed valve box and flows out from the side, when the slurry flows into the diaphragm cavity through the elbow, and when the slurry flows in from the bottom of the discharge valve box and flows out from the side to the discharge main pipe, the slurry flow channel is a 90° curve. The 90° change in the flow direction of the slurry in the flow parts is prone to generate eddy currents, increase the possibility of cavitation, and affect the service life of each flow part.

[0006] (3) The valve box body is a casting structure with large size, high weight, complex structure, and easy to produce casting defects. In addition, two sets of molds are required to manufacture the two valve boxes, which increases the manufacturing cost.

[0007] (4) The number of hydraulic end parts is large, the production cost is high, the possibility of failure is increased, the assembly time is long, and the tolerance is large.

[0008] (5) The diaphragm chamber and nitrogen bag are made of stainless steel integral castings, which has high production costs.

[0009] In order to reduce production costs, reduce failure risks and increase service life, it is urgent to develop a hydraulic end for a low-pressure corrosion-resistant diaphragm pump. Summary of the invention

[0010] The present invention aims at solving the above problems and provides a low-pressure corrosion-resistant diaphragm pump hydraulic end with a reasonable structure, reduced overall length of the equipment, optimized flow-through parts structure, and reduced manufacturing cost of the hydraulic end.

[0011] In order to achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical scheme, which includes a diaphragm chamber, characterized in that: a valve box is provided at the inlet and outlet of the diaphragm chamber; the valve box includes a box body, the lower end of the box body is the inlet, and the upper end of the box body is the outlet; a discharge box cover is provided at the outlet of the box body, a discharge box cover is provided with a discharge through hole, a one-way valve matching the inlet of the box body is provided in the box body, and the fixed end of the one-way valve is fixedly connected to the box cover; the outlet end of one valve box is connected to the inlet end of the diaphragm chamber, serving as a feed valve box; the inlet end of the other valve box is connected to the outlet end of the diaphragm chamber, serving as a discharge valve box.

[0012] As a preferred solution of the present invention, the one-way valve includes a valve seat cooperating with the box body outlet, and a guide sleeve connected to the discharge box cover, a valve stem is arranged in the guide sleeve, a valve core cooperating with the valve seat is arranged at the lower end of the valve stem, and a thrust spring is arranged between the discharge box cover and the valve core.

[0013] Furthermore, the discharge box cover includes a cover body connected to the box body, a boss is provided on one side of the cover body located inside the box body, an inner slope is formed between the boss and the inner surface of the cover body; a groove is provided on one side of the cover body located outside the box body, an outer slope is formed between the groove and the outer surface of the cover body, and the discharge through hole connects the inner slope and the outer slope.

[0014] Furthermore, the guide sleeve of the one-way valve is fixed on the boss.

[0015] As another preferred embodiment of the present invention, a support base is arranged on one side of the lower end of the diaphragm chamber, and the support base is connected to a hydraulic end support; the hydraulic end support includes a support body, and the support body is provided with a horizontal positioning platform fixed to the side surface of the support base, and a vertical support platform fixed to the lower surface of the support base.

[0016] As a third preferred solution of the present invention, the diaphragm chamber is connected to the power end, and a power end support is arranged below the cavity of the power end.

[0017] As a fourth preferred embodiment of the present invention, the inlet of the valve box for feeding is directly connected to a feeding main pipe through a connecting pipe; the outlet of the valve box for discharging is directly connected to a discharging main pipe through a connecting pipe.

[0018] Furthermore, a nitrogen bag is also provided on the discharge main pipe.

[0019] As a fifth preferred embodiment of the present invention, the nitrogen bag and the inner surface of the diaphragm chamber in contact with the slurry are both welded to a stainless steel layer.

[0020] The beneficial effects of the present invention are as follows: 1. The slurry flows from bottom to top, from the feed main pipe through the feed valve box, the diaphragm chamber, the discharge valve box to the discharge main pipe. The center lines of the flow parts coincide, and the flow direction of the medium at each location remains basically consistent. The flow performance is good, and the vortex generated by the 90° change in the medium flow direction in the traditional hydraulic end is avoided, the possibility of vortex and cavitation is reduced, and the service life of each flow part is effectively extended.

[0021] 2. The hydraulic end has a compact structure and small length, which reduces production costs, plant space, foundation construction costs and transportation costs.

[0022] 3. The structures of the inlet and outlet valve boxes are consistent. The valve box body can use pipe processing parts instead of traditional castings. Only one set of CNC programs can be used to complete the processing, which reduces the production cost while avoiding the formation of easily corrosive parts caused by casting defects, greatly improving the corrosion resistance of the valve box body and increasing the service life of the valve box body.

[0023] 4. The elbows and related bolts are eliminated, which reduces the number of parts and the weight of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 yes Figure 1 A partial enlarged view of .

[0026] Figure 3 yes Figure 1 Left view of .

[0027] Figure 4 It is a structural diagram of the valve box.

[0028] Figure 5 It is a structural schematic diagram of an existing three-cylinder single-acting diaphragm pump.

[0029] Figure 6 yes Figure 5 Left view of .

[0030] In the attached drawings, 1 is the feed main pipe, 2 is the valve box, 3 is the diaphragm chamber, 4 is the discharge main pipe, 5 is the nitrogen bag, 6 is the cavity, 7 is the power end, 8 is the hydraulic end support, 9 is the power end support, 10 is the support base, 11 is the horizontal positioning platform, 12 is the vertical support platform, 13 is the box body, 14 is the discharge through hole, 15 is the boss, 16 is the guide sleeve, 17 is the outer bevel, 18 is the inner bevel, 19 is the cover body, 20 is the thrust spring, 21 is the valve seat, and 22 is the valve core. DETAILED DESCRIPTION

[0031] The present invention includes a diaphragm chamber 3, which is characterized in that: a valve box 2 is provided at the inlet and outlet of the diaphragm chamber 3; the valve box 2 includes a box body 13, the lower end of the box body 13 is the inlet, and the upper end of the box body 13 is the outlet; a discharge box cover is provided at the outlet of the box body 13, and a discharge through hole 14 is provided on the discharge box cover, and a one-way valve matching the inlet of the box body 13 is provided in the box body 13, and the fixed end of the one-way valve is fixedly connected to the box cover; the outlet end of one valve box 2 is connected to the inlet end of the diaphragm chamber 3, serving as a feed valve box 2; the inlet end of the other valve box 2 is connected to the outlet end of the diaphragm chamber 3, serving as a discharge valve box 2.

[0032] By optimizing the structure of the hydraulic end of the diaphragm pump, the valve box 2 is designed to have an inlet and an outlet connected to the feed end and the discharge end of the diaphragm chamber 3 respectively, and the fluid flow path is arranged in a straight line from bottom to top, which effectively reduces the occurrence of eddy currents and cavitation in the traditional curved structure, and improves the flow performance and operation stability. At the same time, the universal design of the valve box 2 reduces the number of parts, reduces manufacturing and maintenance costs, and improves the overall corrosion resistance, extending the service life of the equipment.

[0033] As a preferred embodiment of the present invention, the one-way valve includes a valve seat 21 that cooperates with the outlet of the box body 13, and a guide sleeve 16 connected to the discharge box cover, a valve stem is arranged in the guide sleeve 16, a valve core 22 that cooperates with the valve seat 21 is arranged at the lower end of the valve stem, and a thrust spring 20 is arranged between the discharge box cover and the valve core 22.

[0034] The matching structure of the valve core 22 and the valve seat 21, in combination with the reset force provided by the thrust spring 20, ensures the unidirectional flow of the slurry and prevents backflow and blockage. The design of the guide sleeve 16 ensures the stability of the valve stem movement and prolongs the service life of the valve.

[0035] Furthermore, the discharge box cover includes a cover body 19 connected to the box body 13, a boss 15 is provided on one side of the cover body 19 located in the center of the box body 13, and an inner bevel 18 is formed between the boss 15 and the inner surface of the cover body 19; a groove is provided on the side of the cover body 19 located outside the box body 13, and an outer bevel 17 is formed between the groove and the outer surface of the cover body 19, and the discharge through hole 14 connects the inner bevel 18 and the outer bevel 17.

[0036] The inner and outer inclined surfaces 17 of the discharge through hole 14 can effectively guide the fluid to flow smoothly and reduce the impact and turbulence. At the same time, the combined structure of the inclined surface and the groove simplifies the processing technology and improves the structural strength.

[0037] Furthermore, the guide sleeve 16 of the one-way valve is fixed on the boss 15 .

[0038] The guide sleeve 16 is fixed on the boss 15 of the cover body 19. This fixing method facilitates the installation and positioning of the guide sleeve 16, reduces the difficulty of assembly, and improves the assembly and maintenance efficiency of the equipment.

[0039] As another preferred embodiment of the present invention, a support base 10 is provided on one side of the lower end of the diaphragm chamber 3, and the support base 10 is connected to a hydraulic end support 8; the hydraulic end support 8 includes a support body, and the support body is provided with a horizontal positioning platform 11 fixed to the side surface of the support base 10, and a vertical support platform 12 fixed to the lower surface of the support base 10.

[0040] A support base 10 is provided at the lower end of the diaphragm chamber 3 and connected to the hydraulic end support 8, thereby realizing a multi-point support structure for the hydraulic end as a whole, enhancing the stability of the diaphragm chamber 3 and the base, effectively avoiding failures caused by vibration during equipment operation, reducing noise generated during operation, and improving the long-term operating reliability and safety of the pump.

[0041] As a third preferred solution of the present invention, the diaphragm chamber 3 is connected to the power end 7 , and a power end support 9 is arranged below the cavity 6 of the power end 7 .

[0042] As a fourth preferred embodiment of the present invention, the inlet of the valve box 2 for feeding is directly connected to a feeding main pipe 1 through a connecting pipe; the outlet of the valve box 2 for discharging is directly connected to a discharging main pipe 4 through a connecting pipe.

[0043] The use of a pipe to directly connect the valve box 2 and the inlet and outlet main pipe 4 simplifies the pipeline connection structure, reduces the complexity of installation, and avoids leakage problems that may be caused by the traditional complex three-way structure, further improving the overall reliability and transportation efficiency of the equipment.

[0044] Furthermore, a nitrogen bag 5 is also provided on the discharge main pipe 4 .

[0045] As a fifth preferred embodiment of the present invention, the nitrogen bag 5 and the inner surface of the diaphragm chamber 3 in contact with the slurry are both welded to a stainless steel layer.

[0046] The stainless steel layer is welded on the inner surface of the nitrogen bag 5 and the diaphragm chamber 3, which significantly improves the corrosion resistance of key flow-through components, reduces the loss of equipment in acidic or corrosive slurry environments, extends the service life of components, and reduces maintenance and replacement costs.

[0047] After the slurry flows in from the feed main pipe 1, it flows upward into the feed valve box 2, flows into the diaphragm chamber 3 from above the feed valve box 2, flows into the discharge valve box 2 from above the diaphragm chamber 3, flows into the discharge main pipe 4 from above the discharge valve box 2, and is transported to the pipeline.

[0048] The feed main pipe 1, the feed valve box 2, the diaphragm chamber 3, the discharge valve box 2, and the discharge main pipe 4 are arranged vertically from bottom to top, and the vertical center lines coincide with each other.

[0049] The feed main pipe 1 and the diaphragm chamber 3 clamp and fix the feed valve box 2; the diaphragm chamber 3 and the discharge main pipe 4 clamp and fix the discharge valve box 2.

[0050] The feed main pipe 1 and the diaphragm chamber 3, and the diaphragm chamber 3 and the discharge main pipe 4 are connected through the boss 15 studs and hexagonal nuts, and the sealing member is an O-ring.

[0051] The discharge main pipe 4 and the nitrogen bag 5, the diaphragm chamber 3 and the cavity 6 are connected through the boss 15 studs and hexagonal nuts, and the sealing member is a spiral wound gasket.

[0052] The diaphragm chamber 3 and the hydraulic end support 8 are connected through bolts and spring washers.

[0053] The feed valve box 2 and the discharge valve box 2 are cylindrical and have exactly the same structure. The slurry flows from bottom to top in the valve box 2, wherein the box body 13 is a pipe processing part.

[0054] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A low-pressure corrosion-resistant diaphragm pump hydraulic end, comprising a diaphragm chamber (3), characterized in that: A valve box (2) is provided at the inlet and outlet of the diaphragm chamber (3); the valve box (2) comprises a box body (13), the lower end of the box body (13) being the inlet, and the upper end of the box body (13) being the outlet; a discharge box cover is provided at the outlet of the box body (13), a discharge box cover is provided with a discharge through hole (14), a one-way valve matching the inlet of the box body (13) is provided in the box body (13), and a fixed end of the one-way valve is fixedly connected to the box cover; the outlet end of one valve box (2) is connected to the inlet end of the diaphragm chamber (3), serving as a feed valve box (2); the inlet end of the other valve box (2) is connected to the outlet end of the diaphragm chamber (3), serving as a discharge valve box (2).

2. A low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 1, characterized in that: The one-way valve comprises a valve seat (21) matched with the outlet of the box body (13), and a guide sleeve (16) connected to the discharge box cover, a valve stem is arranged in the guide sleeve (16), a valve core (22) matched with the valve seat (21) is arranged at the lower end of the valve stem, and a thrust spring (20) is arranged between the discharge box cover and the valve core (22).

3. A low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 2, characterized in that: The discharge box cover comprises a cover body (19) connected to the box body (13); a boss (15) is provided on one side of the cover body (19) located in the box body (13); an inner bevel (18) is formed between the boss (15) and the inner surface of the cover body (19); a groove is provided on one side of the cover body (19) located outside the box body (13); an outer bevel (17) is formed between the groove and the outer surface of the cover body (19); and the discharge through hole (14) communicates with the inner bevel (18) and the outer bevel (17).

4. A low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 3, characterized in that: The guide sleeve (16) of the one-way valve is fixed on the boss (15).

5. The low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 1, characterized in that: A support base (10) is provided on one side of the lower end of the diaphragm chamber (3), and the support base (10) is connected to a hydraulic end support (8); the hydraulic end support (8) comprises a support body, on which a lateral positioning platform (11) fixed to the side surface of the support base (10) and a vertical support platform (12) fixed to the lower surface of the support base (10) are provided.

6. The low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 1, characterized in that: The diaphragm chamber (3) is connected to the power end (7), and a power end support (9) is provided below the cavity (6) of the power end (7).

7. The low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 1, characterized in that: The inlet of the valve box (2) for feeding is directly connected to a feeding main pipe (1) through a connecting pipe; the outlet of the valve box (2) for discharging is directly connected to a discharging main pipe (4) through a connecting pipe.

8. The low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 7, characterized in that: A nitrogen bag (5) is also provided on the discharge main pipe (4).

9. The low-pressure corrosion-resistant diaphragm pump hydraulic end according to claim 1, characterized in that: The inner surfaces of the nitrogen bag (5) and the diaphragm chamber (3) in contact with the slurry are both welded to a stainless steel layer.

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