Fluid handling – With means for separating solid material from the fluid – Hollow strainer – fluid inlet and outlet perpendicular to...
Reexamination Certificate
1999-11-08
2002-01-01
Rivell, John (Department: 3753)
Fluid handling
With means for separating solid material from the fluid
Hollow strainer, fluid inlet and outlet perpendicular to...
C251S129150
Reexamination Certificate
active
06334461
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a solenoid operated valve, and particularly, to a solenoid operated valve preferably used in a variable capacity compressor.
DESCRIPTION OF THE RELATED ART
One example of a priorly known solenoid operated valve being used in a variable capacity compressor is disclosed in Japanese Laid-Open Patent Publication No. S63-147978, and
FIG. 13
is a cross-sectional view showing the structural outline of the prior art valve mounted to a compressor.
As shown in
FIG. 13
, a solenoid operated valve
10
is sandwiched between side plates
15
and
16
of the compressor, and a body
17
of the valve
10
is mounted through o-rings
13
and
14
to a plate
15
of the compressor. A pressure induction hole
18
and a pressure discharge hole
19
are formed in the body
17
. A valve member
26
for opening and closing the pressure induction hole
18
and the pressure discharge hole
19
are provided in the valve
10
, and the valve member
26
is crimped onto the end of a plunger
20
. The plunger
20
is slidably inserted into a plunger pipe
23
formed in the interior of an electromagnetic coil
21
. A suction element
24
is positioned so as to oppose the plunger
20
. The suction element
24
is also stored in the interior of the electromagnetic coil
21
, and fit to the plunger pipe
23
.
A spring
25
is mounted between the suction element
24
and the plunger
20
. The spring
25
biases the plunger
20
away from the suction element
24
. In other words, the force of the spring
25
pushes the valve member
26
in the direction to close the pressure discharge hole
19
. A steel housing
27
is mounted to. the exterior of the electromagnetic coil
21
. A steel cap
28
is crimped onto the upper end of the housing
27
, and the cap
28
is fit into and fixed to the side plate
16
.
One end of a lead wire of the electromagnetic coil
21
is electrically connected to a connector
29
. The other end of the connector is not shown.
FIG. 13
shows the state where the power is not supplied to the electromagnetic coil
21
, and the valve is closed.
SUMMARY OF THE INVENTION
According to the solenoid operated valve of prior art, the body and the plunger pipe are formed as separate units. Therefore, it was difficult to obtain coaxiality between the body and the plunger, which leads to problems such as valve leakage or operation failure due to deflection of the valve member.
Further, since the body and the plunger pipe of the conventional solenoid operated valve are separate, the manufacturing cost of the valve is relatively expensive.
Moreover, since the body and the plunger pipe are formed separately and there is a need to assemble the separate members, dispersion is likely to occur between the lift of the plunger and the lift of the valve member. This leads to unstabilized suction power and unstabilized open valve flow, which results in the lack of capability of the variable capacity compressor.
The present invention aims at solving the above problems. The object of the present invention is to utilize a pipe sleeve with a bottom formed by deep drawing, which constitutes the body and the plunger pipe integrally. Thereby, a solenoid operated valve having improved reliability and performance, and with no valve leakage or motion troubles may be provided.
Another object of the present invention is to provide a solenoid operated valve having accurate suction force and flow rate of the plunger, which leads to stabilized variability of the variable capacity compressor.
Yet another object of the present invention is to provide a valve with improved magnetic properties and a reduced number of members to be assembled.
In order to achieve the above objects, the present invention provides a solenoid operated valve in which a suction element is attracted by an electromagnetic coil, comprising a body and a plunger pipe being integrally formed as a pipe sleeve to which said suction element is inserted and fixed, and a plunger slidably mounted within said pipe sleeve and including a valve member, wherein said pipe sleeve is formed by deep drawing to include a bottom portion, and a valve opening is equipped to said bottom portion.
Further, the embodiment of the present solenoid operated valve includes forming a step portion to the pipe sleeve, and to press-fit a filter to the pipe sleeve which stops at the step portion, thereby being fixed to the pipe sleeve.
Moreover, according to another embodiment of the present solenoid operated valve, a filter is mounted to the flow-in opening of the pipe sleeve.
According to the valve of the present invention, the plunger pipe and the body are formed integrally as a deep-drawn pipe sleeve with a bottom, which is different from the prior art valve in which the plunger pipe and the body are formed as separate members. According to the structure of the present invention, the coaxiality of the valve will be improved, and deflection of the valve member equipped in the plunger may be prevented, thereby improving the performances and reliability of the valve.
Even further, since the plunger pipe and the body are integrally formed as one unit, the number of members to be assembled is reduced, and the dispersion of the lift of the valve member and the plunger during assembly may be reduced, which leads to obtaining an accurate flow rate of the valve.
Moreover, since the pipe sleeve is formed as a deep-drawn integrated pipe with a bottom, the filter may be accurately mounted to the pipe sleeve.
REFERENCES:
patent: 3326511 (1967-06-01), Hallgreen
patent: 5752689 (1998-05-01), Barkhimer et al.
patent: 5865213 (1999-02-01), Scheffel et al.
patent: 6003838 (1999-12-01), Beck
patent: 0 511 760 (1992-11-01), None
patent: 09229227 (1997-05-01), None
patent: 97/06040 (1997-02-01), None
Imai Masayuki
Kibune Hitoshi
Armstrong Westerman Hattori McLeland & Naughton LLP
Fujikoki Corp.
Rivell John
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