Mold design for a split⁃type air conditioner indoor unit base

doi:10.19491/j.issn.1001-9278.2025.11.020

Abstract

Abstract:

This paper reports the structural analysis and injection mold design for a split⁃type air conditioner indoor unit base. A novel mold with ejector mechanisms integrated into both the stationary and moving halves was developed. To facilitate the release of long， high bars and counteract vacuum formation during mold opening， an ejector mechanism was specifically designed for the stationary mold. Various complex features on the part necessitated multiple specialized mechanisms： a slant⁃pin⁃driven slider was designed for the external rib and bottom wall features； a double⁃bevel⁃wedge⁃driven slider was implemented for the undercut on the bottom wall； and additional sliders were employed to demold the V⁃shaped groove above the vent and the three undercuts below it. For the small cylindrical hole in the upper right corner and the outlet pipes on both sides， which have high draft angles， differently structured angle⁃pin mechanisms were designed. An angled⁃lifter mechanism was utilized for the ribs within the vent. To ensure high⁃quality molding， a hot runner system with a cylindrical gate was adopted. Furthermore， a conformal cooling channel layout was designed to maintain uniform mold temperature.

Key words: split type air conditioner indoor unit base, plastic mold, hot runner, fixed mould push rod, release mechanism

CLC Number:

TQ320.66⁺2

LI Linghua. Mold design for a split⁃type air conditioner indoor unit base[J]. China Plastics, 2025, 39(11): 131-136.

Figures/Tables 12

Fig.1. Product diagram

Fig.2. Dynamic and fixed mold insert design

Fig.3. Mold release mechanism for the upper and lower holes of the vent

Fig.4. Bottom wall and external reinforcement position release mechanism

Fig.5. Bottom wall buckle release mechanism

Fig.6. The mold ejection structure and the slider mechanism at both ends of the product

Fig.7. Cylindrical hole release mechanism

Fig.8. Outlet pipe demolding mechanism

Fig.9. Inclined top release mechanism

Fig.10. Gating system design

Fig.11. Cooling system design

Fig.12. Sectional view of the mold

References 16

[1]	詹建新.分体空调器底盘注射模设计［J］.模具制造，2009，9（8）：11⁃15.
	ZHAN J X. Injection mold design for split air conditioner chassis［J］. Mold Manufacturing， 2009，9（8）：11⁃15.
[2]	孙令真，叶烁.分体空调底盘注塑模具设计［J］.中国塑料，2021，35（12）：129⁃136.
	SUN L Z， YE Y.Split air conditioner chassis injection molding mold design［J］.China Plastics， 2021，35（12）：129⁃136.
[3]	夏雨，高云霄.汽车空调管接头复杂塑件注塑模设计［J］.工程塑料应用，2024，52（10）：100⁃108.
	XIA Y， GAO Y X. Design of injection molding mold for complex plastic automotive air conditioning pipe fittings［J］. Engineering Plastics Applications，2024，52（10）：100⁃108.
[4]	王新蒙.空调器下壳体大角度斜抽芯注塑模具设计［J］.塑料，2021，50（4）：108⁃111，117.
	WANG X M.Design of Injection Mold with Large⁃Angle Slant Core for Lower Housing of Air Conditioner［J］.Plastics， 2021，50（4）：108⁃111，117.
[5]	蔡凯武，李秋奋，王春鹏.汽车保险杠装饰条塑料精密模具设计［J］.塑料，2022，51（1）：89⁃93，144.
	CAI K W， LI Q F， WANG C P. Automobile bumper trim plastic precision mold design［J］.Plastics， 2022，51（1）：89⁃93，144.
[6]	褚建忠.基于内分型结构的汽车保险杠注塑模具设计［J］.工程塑料应用，2021，49（4）：55⁃59.
	CHU J Z. Design of automotive bumper injection molding die based on internal segmentation structure［J］. Engineering Plastics Applications， 2021，49（4）：55⁃59.
[7]	简忠武，苏曦，王品，等.给排水管三通接头旋转抽芯机构注塑模具设计［J］.工程塑料应用，2020，48（9）：88⁃91，102.
	JIAN Z W， SU X， WANG P， et al. Design of injection molding mold for rotating core mechanism of water supply and drainage pipe tee joint［J］. Engineering Plastics Applications， 2020，48（9）：88⁃91，102.
[8]	洪维，傅莹龙.汽车仪表板下本体的大型注塑模具设计［J］.工程塑料应用，2022，50（5）：107⁃112.
	HONG W， FU Y L. Design of large injection molds for the main body under the car dashboard［J］. Engineering Plastics Applications， 2022，50（5）：107⁃112.
[9]	刘庆东.热流道复杂抽芯斜顶出双色注塑模具设计［J］.中国塑料.2018，32（10）：138⁃142.
	LIU Q D. Design of hot runner complex core pulling and slant eject dual⁃color injection molding mold［J］. China Plastics， 2018，32（10）：138⁃142.
[10]	张维合，冯婧，闫丽静，等.汽车高位制动灯盖板大型注塑模具设计［J］.中国塑料，2021，35（1）：98⁃102.
	ZHANG W H， FENG J， YAN L J， et al. Design of large injection molding mold for high⁃mounted brake light cover of automobiles［J］. China Plastics， 2021，35（1）：98⁃102.
[11]	赵利平，张艳华，于维斌，等.扫地机器人尘盒盖注塑模具设计［J］.中国塑料，2022，36（11）：133⁃139.
	ZHAO L P， ZHANG Y H， YU W B， et al. Design of injection mold for dustbin cover of robot vacuum cleaner［J］. China Plastics， 2022，36（11）：133⁃139.
[12]	骆仕斌，李爱娜.大型液晶电视外壳双层结构注塑模具设计［J］.塑料，2018，47（4）：94⁃98.
	LUO S B， LI A N. Design of double⁃layer injection mold for large LCD TV casing［J］. Plastics， 2018，47（4）：94⁃98.
[13]	王建玲，张丹，王永瑛.显微镜镜筒注射模具设计［J］.塑料，2020，49（5）：143⁃146.
	WANG J L， ZHANG D， WANG Y Y. Microscope barrel injection mold design［J］. Plastics， 2020，49（5）：143⁃146.
[14]	许傲，黄力.医用接插头前模四面抽芯脱模注塑模具设计［J］.塑料，2017，46（2）：110⁃113.
	WANG J L， ZHANG D， WANG Y Y. Microscope barrel injection mold design［J］. Plastics， 2020，49（5）：143⁃146.
[15]	熊毅，陈建学，李帅杰.狭窄空间侧孔的斜顶抽芯机构设计［J］.制造技术与机床，2022，72（4）：94⁃97.
	XIONG Y， CHEN J X， LI S J. Design of the slanted top core pulling mechanism for side holes in narrow spaces［J］. Manufacturing Technology and Machine Tools， 2022，72（4）：94⁃97.
[16]	荣星，胡志超，翁建春，等.阀芯塑件顺序抽芯注塑模具设计［J］.工程塑料应用，2022，50（11）：90⁃96.
	RONG X， HU Z C， WENG J C， et al. Sequential core pull injection molding design for valve core plastic parts［J］. Engineering Plastics Applications， 2022，50（11）：90⁃96.