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Copper-plastic compound pressure reduction-type backflow preventer and manufacturing method thereof

A backflow preventer, copper-plastic composite technology, applied in the direction of control valves, functional valve types, valve details, etc., can solve the problems of insufficient mechanical performance and structure of core load-bearing parts, heavy weight, difficult transportation, poor bonding force, etc.

Inactive Publication Date: 2017-09-19
NINGBO HUACHENG VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the backflow preventers in the prior art basically do not use copper-plastic composite materials, which are costly and heavy and difficult to transport. A small number of copper-plastic composite backflow preventers also have poor functionality due to poor bonding between plastics and copper. At the same time, the current The existing technology is also limited due to the insufficient optimization of the mechanical properties of the core load-bearing parts and the essential structure of the material, especially in large-scale water control equipment.

Method used

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  • Copper-plastic compound pressure reduction-type backflow preventer and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A copper-plastic composite decompression type backflow preventer, which is provided with a main body for the first check valve 1 and a second check valve, which are obtained through square-turn-circle hot extrusion and swaging to obtain a conical forging streamline that is concentrated toward the inner hole. 4, the forging of the supporting column, the working part 3 which is arranged between the first check valve 1 and the second check valve 4 and inserted into the working chamber 6, and the first liquid passage connecting the working part 3 and the first check valve 1 2 and the second liquid channel 5 connecting the working part 3 and the second check valve 4; the bottom of the working part 3 is also connected with a pressure stabilizing device 7; the shell of the backflow preventer is a composite structure with polyamide outside and tin bronze inside.

[0030] The method for manufacturing above-mentioned forged parts, comprises the following steps:

[0031] 1) Pre-pr...

Embodiment 2

[0050] The whole is consistent with Example 1, the difference is:

[0051] The method for manufacturing above-mentioned forged parts, comprises the following steps:

[0052] 2) forging

[0053] ①Heat the tin bronze billet through a vacuum resistance furnace to a temperature 30°C higher than its theoretical solid solution temperature, keep it warm for 1.5min / mm based on the diameter of the copper billet, and then take it out of the furnace, and fix the bottom of the copper billet on the rotary push device ;

[0054] ②The forging hammer head linked with the rotary push device is pushed by the hydraulic generating device, and the copper billet is extruded into a forging billet with a nearly square cross-section at a feed rate of about 5% for each deformation and a final deformation ratio of 45% to deform the copper billet. The length of one forging deformation of the blank is one forging cycle. After the last forging in one cycle is completed, the forging hammer head is fixed o...

Embodiment 3

[0062] The whole is consistent with Example 1, the difference is:

[0063] The method for manufacturing above-mentioned forged parts, comprises the following steps:

[0064] 2) forging

[0065] ① Heat the tin bronze billet through a vacuum resistance furnace to a temperature 50°C higher than its theoretical solid solution temperature, keep it warm for 1.8min / mm based on the diameter of the copper billet, and then take it out of the furnace, and fix the bottom of the copper billet on the rotary push device ;

[0066] ②The forging hammer head linked with the rotary push device is pushed by the hydraulic generating device, and the copper billet is extruded into a forging billet with a nearly square cross-section at a feed rate of about 5% for each deformation and a final deformation ratio of 55% to deform the copper billet. The length of one forging deformation of the blank is one forging cycle. After the last forging in one cycle is completed, the forging hammer head is fixed ...

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Abstract

The invention relates to a copper-plastic composite decompression type backflow preventer and its manufacturing method. The main body of the return valve and the forging of the supporting column of the second check valve, the working part arranged in the middle of the first check valve and the second check valve and inserted into the working chamber, the connecting working part and the second check valve of the first check valve The first liquid passage communicates with the working parts and the second liquid passage of the second check valve; the bottom of the working parts is also connected with a pressure stabilizing device; the shell of the backflow preventer is a composite structure with polyamide outside and tin bronze inside. The copper-plastic composite decompression type backflow preventer of the present invention is made of copper-plastic composite material, has low cost, is easy to transport, and enhances the bonding force between plastic and copper through a specific process. It is made of tin bronze forgings obtained through square-to-circle hot extrusion and rotary forging, which is inclined to the inner hole and has a conical forging streamline. It has high strength and fatigue resistance.

Description

technical field [0001] The invention relates to the field of water control equipment, in particular to a copper-plastic composite decompression type backflow preventer and a manufacturing method thereof. Background technique [0002] The backflow preventer door is mainly an unloading valve, which is an important accessory for industrial and construction pipeline control. The valve is a control component in the fluid delivery system, which has functions such as cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves are also divided into cast iron valves, cast steel valves, stainless steel valves, chrome molybdenum steel valves, chrome molybdenum vanadium steel valves, duplex steel valves, plastic valves, non-standard custom valves and other valve materials according to the material. [0003] However, the backflow preventers in the prior art basically do not use copper-plastic composite material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K15/02F16K11/10F16K27/02B23P15/00
CPCF16K15/025B23P15/001F16K11/10F16K27/0209F16K27/0263
Inventor 王朝阳连超燕梅静容杨建标葛鹏军戴春光
Owner NINGBO HUACHENG VALVE
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