Ejector for ejector cycle system

Details Ejector for ejector cycle system Ejector for ejector cycle system

2002-10-28

2003-08-12

Doerrler, William C. (Department: 3744)

Refrigeration

Refrigeration producer

Compressor-condenser-evaporator circuit

C062S116000, C062S175000, C062S191000

Reexamination Certificate

active

06604379

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application is based on Japanese Patent Application No. 2001-332747 filed on Oct. 30, 2001, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention relates to an ejector used for an ejector cycle system, which sucks gas refrigerant by a high-speed refrigerant flow jetted from a nozzle.
2. Description of Related Art:
In an ejector cycle system described in JP-U-57-76300, as shown in
FIG. 9
, an ejector includes a nozzle
40
for converting a pressure energy of high-pressure refrigerant from a radiator to a speed energy, a mixing portion
42
in which gas refrigerant evaporated in an evaporator is sucked by a high-speed refrigerant flow jetted from the nozzle
41
, and a diffuser
43
in which the speed energy is converted to the pressure energy so that the pressure of refrigerant is increased while refrigerant discharged from the nozzle
40
and the gas refrigerant from the evaporator are mixed. In the ejector, the nozzle
40
has a taper portion
41
at an inlet side, and the diffuser
43
is formed into a taper shape. Because each inner wall of the taper portion
41
and the diffuser
43
is formed into a conical taper shape, it is difficult to form the hole by using a simple drill. Generally, electrical discharge machining or wire cutting is necessary for forming the hole in the taper portion
41
and the diffuser
43
. Accordingly, it is difficult to reduce manufacturing process and product cost.
On the other hand, a taper angel of the taper portion
411
is set at a relative small angle for preventing a large disturbance of the refrigerant flow in the nozzle
40
. Therefore, an axial dimension of the nozzle
40
becomes longer.
SUMMARY OF THE INVENTION
In view of the foregoing problems, it is a first object of the present invention to provide an ejector cycle system having an ejector, which can reduce product cost.
It is a second object of the present invention to provide an ejector for an ejector cycle system, which has a reduced axial dimension.
According to a first aspect of the present invention, an ejector used for an ejector cycle system includes a nozzle for decompressing high-pressure refrigerant flowing from a radiator by converting a pressure energy of the high-pressure refrigerant to a speed energy, and a mixing portion in which gas refrigerant evaporated in an evaporator is sucked by a flow of refrigerant jetted from the nozzle, to be mixed with the refrigerant jetted from the nozzle. In the ejector, the nozzle has a first refrigerant passage, a second refrigerant passage, and a third refrigerant passage in this order in a refrigerant flow direction from a refrigerant inlet toward a refrigerant outlet of the nozzle. Further, the first refrigerant passage, the second refrigerant passage and the third refrigerant passage have cylindrical shapes, respectively, each having a constant passage diameter, and the passage diameter of the first refrigerant passage is larger than the passage diameter of the second refrigerant passage. Accordingly, the first refrigerant passage, the second refrigerant passage and the third refrigerant passage can be readily manufactured by a simple cutting method such as drilling. Thus, product cost of the ejector can be reduced.
In the present invention, the passage diameter of the second refrigerant passage can be made smaller than the passage diameter of the third refrigerant passage. Alternatively, the passage diameter of the second refrigerant passage can be made equal to the passage diameter of the third refrigerant passage. Alternatively, the passage diameter of the second refrigerant passage can be larger than the passage diameter of the third refrigerant passage.
Preferably, the mixing portion has a cylindrical passage having a constant passage diameter. In this case, the mixing portion can be readily formed by the simple cutting method such as drilling.
According to a second aspect of the present invention, in an ejector for an ejector cycle system, a nozzle includes a taper portion in which a passage sectional area is reduced toward a downstream refrigerant side to have a throttle portion at which the passage sectional area becomes smallest, and an outlet passage portion connected to the throttle portion at a refrigerant downstream side. Further, the taper portion has a taper angle at a refrigerant inlet side, that is larger than that at a side of the throttle portion. Accordingly, the flow speed of refrigerant can be rapidly increased, and an axial dimension of the nozzle can be relatively reduced. Thus, the axial dimension of the ejector can be effectively reduced.
In this case, the taper angle of the taper portion can be changed stepwise, and the outlet passage portion of the nozzle can be formed into a cylindrical shape having a constant passage diameter.


REFERENCES:
patent: 3838002 (1974-09-01), Gluntz et al.
patent: 5713212 (1998-02-01), Barnett et al.
patent: 6438993 (2002-08-01), Takeuchi et al.
patent: 57-76300 (1982-05-01), None

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