Plunger pump cylinder body

Abstract

The utility model relates to a plunger pump cylinder body which comprises a metal outer cylinder body and a plastic inner cylinder body. The plastic inner cylinder body is arranged in the metal outer cylinder body, one end part of the plastic inner cylinder body is provided with an inner groove, the other end part of the plastic inner cylinder body is provided with an outer flange, and a Haff fixing ring is arranged in the inner groove; the two ends of the metal outer cylinder body are located between the outer turnup and the Haff fixing ring, the outer turnup and the Haff fixing ring form a limiting combination, and the metal outer cylinder body and the plastic inner cylinder body are fixedly connected through the limiting combination. The plunger pump cylinder body has the advantages that the Haff fixing ring can increase the fixed connection strength between the plastic inner cylinder body and the metal outer cylinder body, so that the plastic layer cannot deform, fall off and crack, and the defects that in the prior art, a lining plastic layer of the plunger pump cylinder body can be sucked to be shrunken and deformed by high negative pressure of a plunger pump, and a lining is torn, deformed and fall off are overcome. And the quality of the plunger pump is improved, so that the plunger pump cylinder body has good negative pressure resistance, positive pressure resistance, cracking resistance and deformation resistance.

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] Plunger-type positive displacement slurry pumps are widely used in industries such as mineral processing, coal, and hydrometallurgy. During operation, the pump cylinder and the plastic lining are easily deformed under the high pressure of the fluid and the high negative pressure of the plunger pump, causing the plastic lining to be stretched, deformed, or even cracked and detached. When the temperature of the slurry being pumped is higher than 60°C, the deformation of the plastic lining can be so severe that it affects the normal operation of the pump.

[0003] Therefore, it is particularly important to design a high-strength plunger pump cylinder body with a plastic lining that is firm, not easily deformed or detached, wear-resistant, corrosion-resistant, and impact-resistant. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a plunger pump cylinder body.

[0005] A plunger pump cylinder body includes: a metal outer cylinder body and a plastic inner cylinder body; the plastic inner cylinder body is disposed inside the metal outer cylinder body, one end of the plastic inner cylinder body has an inner groove, the other end of the plastic inner cylinder body has an outer flange, and a half retaining ring is disposed in the inner groove; the two ends of the metal outer cylinder body are located between the outer flange and the half retaining ring, the outer flange and the half retaining ring form a limiting assembly, and the metal outer cylinder body and the plastic inner cylinder body are fixedly connected by the limiting assembly.

[0006] As a preferred option, the half retaining ring is made of metal.

[0007] As a preferred option, the wall thickness of the plastic inner cylinder can be determined based on the inner diameter of the plunger pump cylinder body: if the inner diameter of the plunger pump cylinder body is less than 200mm, then the wall thickness of the plastic inner cylinder body is 20-25mm; if the inner diameter of the plunger pump cylinder body is 500-600mm, then the wall thickness of the plastic inner cylinder body is 50-80mm. This can prevent the high negative pressure generated by the plunger pump working under mechanical seal suction from causing suction on the plastic inner cylinder body.

[0008] Preferred materials for the inner cylinder include polyetheretherketone (PEEK), fluoroplastics, or polyethylene with a molecular weight of 3 million to 7 million, as these plastics have high temperature resistance and corrosion resistance.

[0009] As a preferred option, the inner plastic cylinder is made of epoxy resin filled with silicon carbide and / or quartz sand, which has high temperature resistance and good wear resistance.

[0010] As a preferred option, the outer cylinder block is made of carbon steel.

[0011] The beneficial effects of this utility model are:

[0012] The design of this utility model with a half retaining ring increases the bonding strength between the plastic inner cylinder and the metal outer cylinder, preventing the plastic layer from deforming, falling off, or cracking. This overcomes the shortcomings of existing technologies where the plastic lining of the plunger pump cylinder is sucked down and deformed by the high negative pressure of the plunger pump, and the inner lining is torn and detached. This improves the quality of the plunger pump and gives the plunger pump cylinder excellent resistance to negative pressure, positive pressure, cracking, and deformation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the plastic inner cylinder;

[0014] Figure 2 This is a schematic diagram of the structure of the Huff retaining ring.

[0015] Explanation of reference numerals in the attached drawings: 1. Metal outer cylinder body; 5. Plastic inner cylinder body; 7. Inner groove; 8. Outer flange; 9. Half retaining ring. Detailed Implementation

[0016] 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.

[0017] Example 1

[0018] like Figure 1 and Figure 2 As shown, a plunger pump cylinder body includes: a metal outer cylinder body 1 and a plastic inner cylinder body 5; the plastic inner cylinder body 5 is disposed inside the metal outer cylinder body 1, one end of the plastic inner cylinder body 5 is provided with an inner groove 7, the other end of the plastic inner cylinder body 5 is provided with an outer flange 8, and a metal half-fixing ring 9 is provided in the inner groove 7; the two ends of the metal outer cylinder body 1 are located between the outer flange 8 and the half-fixing ring 9, the outer flange 8 and the half-fixing ring 9 form a limiting combination, and the metal outer cylinder body 1 and the plastic inner cylinder body 5 are fixedly connected by the limiting combination.

[0019] The inner diameter of the plunger pump cylinder is 150mm, and the wall thickness of the plastic inner cylinder 5 is 20mm; the plastic inner cylinder 5 is made of polyetheretherketone (PEEK); the metal outer cylinder 1 is made of carbon steel.

[0020] Example 2

[0021] Based on Example 1, a plunger pump cylinder body is provided, with an inner cavity diameter of 550 mm and a wall thickness of 70 mm for the plastic inner cylinder body 5. The plastic inner cylinder body 5 is made of polyethylene with a molecular weight of 5 million, and the metal outer cylinder body 1 is made of carbon steel. The rest is the same as in Example 1.

[0022] Example 3

[0023] Based on Example 1, a plunger pump cylinder body is provided, with an inner cavity diameter of 150 mm and a wall thickness of 25 mm for the plastic inner cylinder body 5. The plastic inner cylinder body 5 is made of epoxy resin filled with silicon carbide and / or quartz sand, which has high temperature resistance and good wear resistance. The metal outer cylinder body 1 is made of carbon steel. The rest is the same as in Example 1.

Claims

1. A plunger pump cylinder body, characterized in that, include: Metal outer cylinder and plastic inner cylinder; The plastic inner cylinder is disposed inside the metal outer cylinder. One end of the plastic inner cylinder has an inner groove, and the other end of the plastic inner cylinder has an outer flange. A half-fixing ring is provided in the inner groove. The two ends of the metal outer cylinder are located between the outer flange and the half-fixing ring. The outer flange and the half-fixing ring form a limiting combination. The metal outer cylinder and the plastic inner cylinder are fixedly connected by the limiting combination.

2. The plunger pump cylinder body according to claim 1, characterized in that: The half-fixing ring is made of metal.

3. The plunger pump cylinder body according to claim 1, characterized in that: If the inner diameter of the plunger pump cylinder is less than 200 mm, the wall thickness of the plastic inner cylinder is 20-25 mm; if the inner diameter of the plunger pump cylinder is 500-600 mm, the wall thickness of the plastic inner cylinder is 50-80 mm.

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

5. The plunger pump cylinder body according to claim 1, characterized in that: The plastic inner cylinder is made of epoxy resin filled with silicon carbide and / or quartz sand.

6. The plunger pump cylinder body according to claim 1, characterized in that: The outer metal cylinder body is made of carbon steel.

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