Title:
METHOD FOR FORMING AIR RETURN PIPE, FORMING DIE AND AIR RETURN PIPE
Document Type and Number:
WIPO Patent Application WO/2023/202300
Kind Code:
A1
Abstract:
A method for forming an air return pipe, comprising: controlling a blank (26) to enter a forming cavity, controlling a die core (23) to press the blank (26) such that the blank (26) passes through a first die body (21), and obtaining a first length value of a first formed pipe section formed by the first die body (21); determining that the first length value reaches a first set parameter value, controlling a second die body (22) to press part of the first formed pipe section such that the part of the first formed pipe section is formed into a second formed pipe section, and obtaining a second length value of the second formed pipe section; determining that the second length value reaches a second set parameter value, and controlling the second die body (22) to stop pressing; and controlling a third formed pipe section formed by the first die body (21) to reach a third set parameter value. A forming die (20), comprising the die core (23), the first die body (21) and the second die body (22), wherein the forming cavity is formed between the die core (23) and the first die body (21), the second die body (22) is arranged on one side of a discharge end of the first die body (21) and is provided with a protrusion (223) facing a center of the second die body (22). An air return pipe (10), comprising a first pipe section (11), a second pipe section (12) and a third pipe section (14) which are formed by pressing, wherein the second pipe section (12) is located between the first pipe section (11) and the third pipe section (14), the second pipe section (12) is provided with an accommodation portion, and the accommodation portion is recessed towards a center of the second pipe section (12) and extends in an axial direction of the second pipe section (12). The plurality of pipe sections having different cross-sectional shapes are continuously pressed, so that the plurality of pipe sections are integrally formed, thereby eliminating welding spots between every two adjacent pipe sections, and reducing the leakage risk of the air return pipe.
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Inventors:
LIU XIAOJUN (CN)
CHEN XIAOHUA (CN)
ZHANG RUCUN (CN)
JIA LI (CN)
CHEN XIAOHUA (CN)
ZHANG RUCUN (CN)
JIA LI (CN)
Application Number:
PCT/CN2023/082535
Publication Date:
October 26, 2023
Filing Date:
March 20, 2023
Export Citation:
Assignee:
HEFEI MIDEA REFRIGERATOR CO (CN)
HEFEI HUALING CO LTD (CN)
MIDEA GROUP CO LTD (CN)
HEFEI HUALING CO LTD (CN)
MIDEA GROUP CO LTD (CN)
International Classes:
B21C37/06; B21C23/08; B21C25/08; B21C37/15
Foreign References:
| CN217979970U | 2022-12-06 | |||
| CN103736768A | 2014-04-23 | |||
| CN210463680U | 2020-05-05 | |||
| KR20100038548A | 2010-04-15 | |||
| CN102072598A | 2011-05-25 | |||
| US20210039149A1 | 2021-02-11 |
Attorney, Agent or Firm:
CN-KNOWHOW INTELLECTUAL PROPERTY AGENT LIMITED (CN)
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