JPH0225029Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure of an expansion valve in which support for a spring supporting a valve body is simplified.

A conventional expansion valve is as shown in FIG. communicated through.

The opening degree of this orifice 4 is controlled by a valve body 7 fixed to a valve holder 5 via a spring pin 6.

An operating section 8 is provided in the upper part of the valve body 1, and a chamber C defined by a diaphragm 9 is filled with a refrigerant. The upper surface of a stopper 10 is in contact with the lower surface of the diaphragm, and an operating rod 11 is inserted between the lower surface of the stopper 10 and the valve holder 5. Valve holder 5
A spring receiver 12 is provided in the passage 3 opposite to the passage 3, and is fixed in the passage by caulking the passage from the outside. An adjustment spring 13 is provided between this spring receiver 12 and the valve holder 5.

Therefore, if the temperature of the evaporator now falls below a predetermined value, the temperature or pressure of the refrigerant in the chamber C of the operating section 8 will also drop, and the elasticity of the spring 13 will cause the valve body 7 to reduce the opening degree of the orifice 4 and release a small amount. refrigerant from passage 2 to orifice 4.
The evaporator is adiabatically expanded through the passageway 3 and guided to the evaporator to control the evaporator to a predetermined temperature.

Conversely, when the temperature of the evaporator exceeds a predetermined value, the temperature or pressure of the refrigerant in the chamber C also rises, and the valve body 7 moves down via the actuating rod 11 against the elasticity of the spring 13, causing the orifice 4 to move downward. A large amount of refrigerant is adiabatically expanded from the passage 2 through the orifice 4 and guided to the evaporator from the passage 3, thereby controlling the evaporator to a predetermined temperature.

As is clear from the above, the spring 13 plays an important role in the expansion valve, but supporting and fixing the spring via the spring receiver 12 as in the conventional method requires one extra spring receiver. This required a large number of parts for the spring receiving length, which was expensive and required extra labor during assembly.

The present invention was devised in view of the above points, and according to the present invention, a spring receiver is not required, and the spring itself has an end turn portion, and this end turn portion is caulked and fixed within the passage. It is possible to provide an expansion valve in which a spring support can be omitted and the spring itself has an excellent fixing force.

An embodiment of the present invention will be described below with reference to FIG.
The same parts as in Figure 1 are indicated by the same symbols. That is, the valve body 1, passages 2, 3, orifice 4, valve holder 5,
The spring pin 6, valve body 7, actuating portion 8, diaphragm 9, stopper 10, and actuating rod 11 are completely the same as those shown in FIG. 1, so a description thereof will be omitted.

However, according to the present invention, an end turn portion 15 is provided on the side of the spring 14 facing the valve holder 5, and the outer diameter of this end turn portion is made equal to the inner diameter of the passage 3, so that the end turn portion 15 is tightly attached to the inner periphery of the passage 3. Then, the portion corresponding to the end turn portion 15 on the outer periphery of the passage 3 is caulked and fixed.

Since the present invention is constructed in this way, the spring receiver 12 is not required as in the conventional case, and the number of parts is small, so the number of assembly steps is reduced, the spring can be firmly fixed, and the delicate flow rate of the refrigerant can be controlled. It has the advantage of being able to be accurately adjusted in a stable state and being manufactured at low cost. Furthermore, since the operation of the present invention is exactly the same as the conventional one, the explanation thereof is omitted.

[Brief explanation of drawings]

Figure 1 is a schematic vertical cross-sectional view of a conventional expansion valve;
The figure is a similar vertical cross-sectional view of the expansion valve of the present invention, and FIG. 3 is a vertical cross-sectional view of only the spring. 1... Valve body, 2... First passage, 3... Third
passage, 4... orifice, 7... valve body, 8...
Actuating part, 14... spring.

Claims (1)

[Scope of utility model registration request] an actuating part that is actuated by a temperature change in the evaporator; a first passage connected to the actuating part and connected to the compressor; and a first passage connected to the passage through an orifice, and opening and closing the orifice by the actuation of the actuating part. A valve body having a second passage connected to an evaporator having a valve body, wherein an end turn is formed at an end of a spring that deflects the valve body in the direction of the orifice, and the second passage An expansion valve that is fixed together with the end turn by caulking the inner wall of the valve.