JPH01136357U

JPH01136357U -

Info

Publication number: JPH01136357U
Application number: JP2386888U
Authority: JP
Priority date: 1988-02-26
Filing date: 1988-02-26
Publication date: 1989-09-19

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例に係る膨張弁を表
す一部断面及び回路を含んだ説明図、第２図ａは
クールダウン時におけるオリフイス開度を示すグ
ラフ、第２図ｂはクールダウン時における冷媒過
熱度を示すグラフ、第３図ａは渋滞走行時におけ
るエンジン回転数を示すグラフ、第３図ｂは渋滞
走行時におけるオリフイス開度を示すグラフ、第
３図ｃは渋滞走行時における冷媒過熱度を示すグ
ラフ、第４図はこの考案の他の実施例を示す第１
図相当の説明図、第５図はこの考案の従来例を示
す第１図相当の説明図、第６図ａは従来例に係る
第２図ａ相当のグラフ、第６図ｂは従来例に係る
第２図ｂ相当のグラフ、第７図ａは従来例に係る
第３図ａ相当のグラフ、第７図ｂは従来例に係る
第３図ｂ相当のグラフ、そして第７図ｃは従来例
に係る第３図ｃ相当のグラフ、５，１７，２９……膨張弁、２……エバポレー
タ、３……一次側通路、４……圧力室、５，２１
，２９……膨張室、７……二次側通路、１１……
接続連通部、１２……オリフイス、１５……スプ
リング、２０，３０……作動体、２８……制御部
、Ｒ……冷媒、Ｌ……低速走行時。 Fig. 1 is an explanatory diagram including a partial cross section and circuit showing an expansion valve according to an embodiment of this invention, Fig. 2 a is a graph showing the orifice opening degree during cool down, and Fig. 2 b is a graph showing the opening degree of the orifice during cool down. Figure 3a is a graph showing the engine speed when driving in traffic jams, Figure 3b is a graph showing the orifice opening degree when driving in traffic jams, and Figure 3c is a graph showing the degree of orifice opening when driving in traffic jams. A graph showing the degree of superheating of the refrigerant, FIG. 4 is a graph showing another embodiment of this invention.
Fig. 5 is an explanatory drawing equivalent to Fig. 1 showing a conventional example of this invention, Fig. 6 a is a graph corresponding to Fig. 2 a related to the conventional example, Fig. 6 b is a graph corresponding to the conventional example. 7a is a graph corresponding to FIG. 3a according to the conventional example, FIG. 7b is a graph corresponding to FIG. 3b according to the conventional example, and FIG. 7c is a graph corresponding to the conventional example. Graph corresponding to FIG. 3 c according to the example, 5, 17, 29... Expansion valve, 2... Evaporator, 3... Primary side passage, 4... Pressure chamber, 5, 21
, 29... expansion chamber, 7... secondary side passage, 11...
Connection communication section, 12... Orifice, 15... Spring, 20, 30... Operating body, 28... Control section, R... Refrigerant, L... When running at low speed.

Claims

[Scope of Claim for Utility Model Registration] A pressure chamber in which the pressure changes due to a change in the degree of superheating of the refrigerant in the secondary passage of the evaporator, an expansion chamber in which an orifice is formed in the connection to the primary passage of the evaporator, and the expansion chamber. and a valve body that is always biased by a spring in the direction of closing the orifice, and the valve body resists the biasing force of the spring by an amount corresponding to the degree of pressure change in the pressure chamber and closes the orifice. An expansion valve that is moved in the opening direction, characterized in that the spring is provided with an actuating body for adjusting its biasing force, and a control unit for detecting the degree of superheat of the refrigerant is connected to the actuating body.