Plunger pump cylinder body

Abstract

The utility model relates to a plunger pump cylinder body which comprises a metal outer cylinder body, a plastic inner cylinder body and a solid material layer. The plastic inner cylinder body is arranged in the metal outer cylinder body and is fixedly connected with the solid material layer. The plunger pump has the advantages that the solid material layer enables the plastic inner cylinder body to be firmly fixed in the inner cavity of the metal outer cylinder body in the radial direction and the axial direction, the metal outer cylinder body and the plastic inner cylinder body can be prevented from moving in the circumferential direction, and the plunger pump can run stably and reliably; the strength of the solid material layer after curing can be improved by the solid material layer, so that the lined plastic inner cylinder body can be more firmly fixed on the metal outer cylinder body; the strength of the plunger can be enhanced by the metal framework, and the connecting strength of the plunger and the plunger pushing rod is enhanced; holes are formed in the metal framework, so that plastic is anchored when the annular cylindrical metal framework is fixedly connected with the plastic layer, and the fixed connection strength is enhanced. The plastic inner cylinder body is high in strength and good in self-lubricating performance.

Description

Technical Field

[0001] This utility model belongs to the technical field of plunger volumetric slurry pumps, and particularly relates to a plunger pump cylinder. Background Technology

[0002] In existing technologies, the piston pump cylinder body in piston pumps has low strength, high brittleness, and is prone to cracking and damage, resulting in poor installation performance. During operation, the pump cylinder body and the plastic lining are easily deformed under the high pressure of the fluid and the high negative pressure of the piston pump, leading to tearing and deformation of the inner lining, stretching and deformation of the plastic lining, and even cracking and falling off. When the temperature of the conveyed slurry is higher than 60°C, the deformation of the plastic lining can be so severe that it affects the normal operation of the pump. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a plunger pump cylinder body.

[0004] A plunger pump cylinder body includes: a metal outer cylinder body, a plastic inner cylinder body, and a solid material layer; the plastic inner cylinder body is disposed within the metal outer cylinder body, the plastic inner cylinder body is fixedly connected to the solid material layer, and the solid material layer is fixedly connected to the metal outer cylinder body; the solid material layer is used to fix and restrict the axial position of the plastic inner cylinder body, so that the plastic inner cylinder body is fixed in the inner cavity of the metal outer cylinder body both radially and axially.

[0005] Preferably, the outer side of the plastic inner cylinder is provided with an annular groove, and the inner wall of the metal outer cylinder is provided with an annular protrusion. The solid material layer is located in the gap between the annular groove and the annular protrusion. After the solid material is cured in the gap between the annular groove and the annular protrusion to form a solid material layer, the plastic inner cylinder is firmly fixed in the inner cavity of the metal outer cylinder in both the radial and axial directions. This prevents the metal outer cylinder and the plastic inner cylinder from moving in the circumferential direction, so that the plunger pump can operate stably and reliably.

[0006] As a preferred option, a metal frame is embedded in the plastic inner cylinder.

[0007] As a preferred embodiment, the metal skeleton is in the shape of a ring cylinder, and several holes are evenly provided along the side wall of the ring cylinder metal skeleton. The holes are used to anchor the plastic layer and strengthen the bonding strength when the ring cylinder metal skeleton is fixed to the plastic layer.

[0008] As a preferred option, the metal frame is completely encased in the plastic inner cylinder.

[0009] As a preferred option, the inner cylinder is made of polyethylene (PE), polypropylene (PP), polyetheretherketone (PEEK), polytetrafluoroethylene, or polyethylene with a molecular weight of 3 million to 7 million, which have anti-corrosion and wear-resistant properties. These plastics have high strength and good self-lubricating properties, and can be flexibly selected according to the corrosiveness of the medium in use.

[0010] As a preferred option, the thickness of the solid material layer is set to 2–20 mm, depending on the fluidity of the cast solid material.

[0011] Preferably, the solid material layer is an epoxy resin material or cement material filled with silicon carbide and / or quartz sand. The purpose of filling the epoxy resin or cement with mineral particles such as silicon carbide and / or quartz sand is to increase the strength of the solid material layer after curing, so as to more firmly fix the inner plastic cylinder to the outer metal cylinder.

[0012] Preferably, the silicon carbide and / or quartz sand filling the epoxy resin or cement material accounts for 50% of the total volume of the solid material layer.

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

[0014] A solid material layer is fixed between the metal outer cylinder and the plastic inner cylinder, which firmly fixes the plastic inner cylinder in the inner cavity of the metal outer cylinder in both the radial and axial directions. This prevents the metal outer cylinder and the plastic inner cylinder from moving in the circumferential direction, ensuring stable and reliable operation of the plunger pump. The solid material layer also increases the strength of the solid material layer after curing, so as to more firmly fix the inner plastic cylinder to the metal outer cylinder.

[0015] A metal skeleton is embedded within the plastic inner cylinder, which increases the strength of the plunger and enhances the connection between the plunger and the plunger push rod. Several holes are also made in the metal skeleton to anchor the plastic layer and strengthen the connection when the annular metal skeleton is fixed to it. The plastic inner cylinder has high strength and good self-lubricating properties.

[0016] The plunger pump cylinder body designed in this utility model can be used to transport highly corrosive liquids or slurries. Attached Figure Description

[0017] Figure 1 A schematic diagram showing a solid material layer fixed between a metal outer cylinder and a plastic inner cylinder;

[0018] Figure 2 A schematic diagram showing a solid material layer fixed between a metal outer cylinder and a plastic inner cylinder, with a metal skeleton embedded in the plastic inner cylinder.

[0019] Figure 3 A schematic diagram showing a ring-shaped metal frame with holes.

[0020] Figure 4 A schematic diagram showing a metal skeleton completely encased in a plastic layer;

[0021] Figure 5 This is a schematic diagram of a plastic inner cylinder made by heating a plastic sheet and rolling it into a sleeve shape.

[0022] Explanation of reference numerals in the attached drawings: 1. Metal outer cylinder body; 3. Metal frame; 4. Hole; 5. Plastic inner cylinder body; 6. Solid material layer; 7. Plastic sheet; 8. Weld joint. Detailed Implementation

[0023] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that, for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0024] Example 1

[0025] like Figure 1 As shown, a plunger pump cylinder body includes: a metal outer cylinder body 1, a plastic inner cylinder body 5, and a solid material layer 6; the plastic inner cylinder body 5 is disposed inside the metal outer cylinder body 1, and the solid material layer 6 is fixedly connected to the plastic inner cylinder body 5, and the solid material layer 6 is fixedly connected to the metal outer cylinder body 1; the solid material layer 6 is used to fix and restrict the axial position of the plastic inner cylinder body 5, so that the plastic inner cylinder body 5 is fixed in the inner cavity of the metal outer cylinder body 1 both radially and axially; the plastic inner cylinder body 5 is obtained by molding plastic raw material.

[0026] The outer side of the plastic inner cylinder 5 is provided with an annular groove, and the inner wall of the metal outer cylinder 1 is provided with an annular protrusion. The solid material layer 6 is located in the gap between the annular groove and the annular protrusion. After the solid material is cured in the gap between the annular groove and the annular protrusion to form a solid material layer, the plastic inner cylinder is firmly fixed in the inner cavity of the metal outer cylinder in both the radial and axial directions. This prevents the metal outer cylinder and the plastic inner cylinder from moving in the circumferential direction, so that the plunger pump can operate stably and reliably.

[0027] The inner plastic cylinder 5 is made of 5 million molecular weight polyethylene with anti-corrosion and wear-resistant properties. The thickness of the solid material layer is set to 10 mm according to the fluidity of the cast solid material. The solid material layer 6 is made of epoxy resin filled with silicon carbide. The purpose is to increase the strength of the solid material layer after curing so as to fix the inner plastic cylinder to the outer metal cylinder more firmly. The silicon carbide filled in the epoxy resin accounts for 50% of the total volume of the solid material layer 6.

[0028] Example 2

[0029] like Figure 1As shown, a plunger pump cylinder body includes: a metal outer cylinder body 1, a plastic inner cylinder body 5, and a solid material layer 6; the plastic inner cylinder body 5 is disposed inside the metal outer cylinder body 1, and the solid material layer 6 is fixedly connected to the plastic inner cylinder body 5, and the solid material layer 6 is fixedly connected to the metal outer cylinder body 1; the solid material layer 6 is used to fix and restrict the axial position of the plastic inner cylinder body 5, so that the plastic inner cylinder body 5 is fixed in the inner cavity of the metal outer cylinder body 1 both radially and axially; the plastic inner cylinder body 5 is obtained by compression molding.

[0030] like Figure 2 As shown, a metal frame 3 is embedded inside the plastic inner cylinder 5; as Figure 3 As shown, the metal skeleton 3 is in the shape of an annular cylinder. Several holes 4 are evenly opened along the annular sidewall of the annular metal skeleton 3. The holes are used to anchor the plastic and strengthen the bonding strength when the plastic layer is fixed to the annular metal skeleton.

[0031] like Figure 4 As shown, the metal frame 3 is completely encased in the plastic inner cylinder 5;

[0032] The inner plastic cylinder 5 is made of polyetheretherketone (PEEK) material, which has anti-corrosion and wear-resistant properties. The thickness of the solid material layer is set to 15mm according to the fluidity of the cast solid material. The solid material layer 6 is cement material filled with quartz sand. The purpose is to increase the strength of the solid material layer after curing so as to fix the inner plastic cylinder to the metal outer cylinder more firmly. The quartz sand filled in the cement material accounts for 50% of the total volume of the solid material layer 6.

[0033] Example 3

[0034] A plunger pump cylinder body includes a metal outer cylinder body, a plastic inner cylinder body, and a solid material layer;

[0035] The inner plastic cylinder is a tubular plastic sleeve; a metal skeleton is embedded in the inner plastic cylinder; the metal skeleton is annular, and several holes are evenly opened along the annular sidewall of the annular metal skeleton. The inner plastic cylinder and the metal skeleton are welded and fixed together. The welding and fixing together means that plastic welding rods are used to weld on the holes. After the plastic welding rods melt, the inner plastic cylinder and the metal skeleton are fixed together. At the same time, the inner plastic cylinder is anchored and fixed to the holes of the metal skeleton (that is, the metal skeleton is partially embedded in the inner plastic cylinder).

[0036] The plastic inner cylinder is fixed to the solid material layer, and the solid material layer is fixed to the metal outer cylinder. The solid material layer is used to fix and restrict the axial position of the plastic inner cylinder, so that the plastic inner cylinder is fixed to the inner cavity of the metal outer cylinder both radially and axially. The solid material layer is an epoxy resin material filled with silicon carbide, the purpose of which is to increase the strength of the solid material layer after curing, so as to more firmly fix the inner plastic cylinder to the metal outer cylinder. The silicon carbide filled in the epoxy resin material accounts for 50% of the total volume of the solid material layer.

[0037] The aperture of the hole is 10mm; the material of the plastic inner cylinder is modified polypropylene with a molecular weight of 3 million.

[0038] Example 4

[0039] A plunger pump cylinder body includes: a metal outer cylinder body, a plastic inner cylinder body, and a solid material layer;

[0040] The plastic inner cylinder is made from commercially available plastic pipes; a metal frame is embedded in the plastic inner cylinder; the metal frame is in the shape of a ring cylinder, and several holes are evenly opened along the side wall of the ring cylinder metal frame; the plastic inner cylinder is fixed to the metal frame by self-tapping screws passing through the holes on the metal frame.

[0041] The plastic inner cylinder is fixed to the solid material layer, and the solid material layer is fixed to the metal outer cylinder. The solid material layer is used to fix and restrict the axial position of the plastic inner cylinder, so that the plastic inner cylinder is fixed to the inner cavity of the metal outer cylinder both radially and axially. The solid material layer is an epoxy resin material filled with silicon carbide, the purpose of which is to increase the strength of the solid material layer after curing, so as to more firmly fix the inner plastic cylinder to the metal outer cylinder. The silicon carbide filled in the epoxy resin material accounts for 50% of the total volume of the solid material layer.

[0042] The aperture of the pores is 30mm; the plastic layer is polyvinylidene fluoride with a molecular weight of 7 million.

[0043] Example 5

[0044] A plunger pump cylinder body includes: a metal outer cylinder body, a plastic inner cylinder body, and a solid material layer;

[0045] The plastic inner cylinder is formed by heating and welding plastic sheet 7 and then rolling it into a sleeve (it can be formed by rolling a single plastic sheet 7 into a cylindrical shape and welding it at the welding point 8, or by welding multiple plastic sheets 7 in pairs); a metal skeleton is embedded in the plastic inner cylinder; the metal skeleton is in the shape of an annular cylinder, and several holes are evenly opened along the side wall of the annular cylinder. The plastic inner cylinder 5 is fixed to the inside of the annular cylinder by resin casting; the outer periphery of the plastic inner cylinder is first processed to form a concave part, and holes or grooves are processed on the annular cylinder. Then, a casting mold is set up, and resin is poured into the outer periphery of the plastic inner cylinder and the grooves and through holes of the annular cylinder. After the resin cures, the plastic inner cylinder can be fixed to the annular cylinder.

[0046] The plastic inner cylinder is fixed to the solid material layer, and the solid material layer is fixed to the metal outer cylinder. The solid material layer is used to fix and restrict the axial position of the plastic inner cylinder, so that the plastic inner cylinder is fixed to the inner cavity of the metal outer cylinder both radially and axially. A plastic-lined plunger pump cylinder with a ring-shaped metal skeleton can be obtained by machining. The solid material layer is an epoxy resin material filled with silicon carbide, the purpose of which is to increase the strength of the solid material layer after curing, so as to more firmly fix the inner plastic cylinder to the metal outer cylinder. The silicon carbide filled in the epoxy resin material accounts for 50% of the total volume of the solid material layer.

[0047] The aperture of hole 4 is 20mm; the inner plastic cylinder is made of polyethylene with a molecular weight of 5 million.

Claims

1. A plunger pump cylinder body, characterized in that, include: Metal outer cylinder, plastic inner cylinder, and solid material layer; The plastic inner cylinder is disposed within the metal outer cylinder, the plastic inner cylinder is fixedly connected to the solid material layer, and the solid material layer is fixedly connected to the metal outer cylinder; the solid material layer is used to fix and restrict the axial position of the plastic inner cylinder, so that the plastic inner cylinder is fixed in the inner cavity of the metal outer cylinder both radially and axially.

2. The plunger pump cylinder body according to claim 1, characterized in that: The outer side of the plastic inner cylinder is provided with an annular groove, and the inner wall of the metal outer cylinder is provided with an annular protrusion. The solid material layer is located in the gap between the annular groove and the annular protrusion.

3. The plunger pump cylinder body according to claim 1, characterized in that: The metal frame is embedded in the plastic inner cylinder.

4. The plunger pump cylinder body according to claim 3, characterized in that: The metal skeleton is in the shape of a ring cylinder, and several holes are evenly opened along the side wall of the ring cylinder metal skeleton.

5. The plunger pump cylinder body according to claim 4, characterized in that: The metal frame is completely enclosed within the plastic inner cylinder.

6. The plunger pump cylinder body according to claim 1, characterized in that: The plastic inner cylinder is made of polyethylene, polypropylene, polyetheretherketone, polytetrafluoroethylene, or polyethylene with a molecular weight of 3 million to 7 million.

7. The plunger pump cylinder body according to claim 1, characterized in that: The thickness of the solid material layer is set to 2–20 mm.

8. The plunger pump cylinder body according to claim 1, characterized in that: The solid material layer is an epoxy resin material or cement material filled with silicon carbide and / or quartz sand.

9. The plunger pump cylinder body according to claim 8, characterized in that: The silicon carbide and / or quartz sand filling the epoxy resin or cement material accounts for 50% of the total volume of the solid material layer.

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