JP4454329B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve equipped in a compressor or the like.

For example, a compressor used in a refrigeration cycle is a vane type compressor, has a refrigerant suction port and a discharge port provided in a housing, compresses the refrigerant sent from the evaporator side, and discharges from the discharge port. It has a function to feed to the expansion valve side.
The suction port of the compressor is equipped with a suction valve whose flow path opening area changes according to the flow rate of the refrigerant.
A vane type compressor provided with this type of valve is disclosed in the following patent document.
JP-A-5-288186

  The objective of this invention is providing the check valve of the refrigerant | coolant with which the compressor arrange | positioned at a refrigerating cycle is equipped.

In order to achieve the above object, a check valve of the present invention is a check valve for a refrigerant that is attached to an opening of a housing of a compressor of a refrigeration cycle, and has a bottomed cylinder part and a bottom part of the cylinder part. A valve body having a refrigerant inlet provided in the cylinder, a stopper member attached to the opening end of the cylindrical portion, and slidably accommodated in the axial direction in the cylindrical portion, and the refrigerant between the stopper member a valve body for changing the opening area of the refrigerant flow out path according to the lift amount from the inlet to form a refrigerant flow out path for flowing out the spring for urging the valve body in the inlet And is a premise of the invention.

Then, the stopper member, the cylindrical portion of the valve body is constituted by an annular plate-shaped ring member having a circular opening that is inserted slidably in the axial direction, the side surface of said valve body, An isosceles triangular recess that is opened with respect to the annular clearance on the inner cylindrical surface side of the cylinder portion that communicates with the inlet when the valve body is lifted is provided , and the lift amount of the valve body from the inlet The first feature of the present invention is that the refrigerant outflow passage cross-sectional area between the valve body and the stopper member increases as the pressure increases . Further, the valve body is formed of a metal material, and the stopper member is attached to the tube portion by bending the opening end of the tube portion inward, which is a second feature of the invention.

The check valve of the present invention has a simple structure in which an isosceles triangular recess is provided on the side surface of the valve body, but the refrigerant gas outflow passage to the downstream side of the valve body when the valve body is lifted is cut off. There is no sudden change in the area, and therefore a sudden change in the differential pressure can be prevented. In addition, the dimensions and the like can be easily changed in accordance with the structure of the attachment counterpart device.

FIG. 1 is an explanatory view showing the check valve mounting structure of the present invention.
The compressor housing 1 has a refrigerant discharge port 2, and a check valve 10 is provided between the discharge port 2 and the compression chamber 3.
The check valve 10 of the present invention includes a valve body 100, a valve body 200, a spring 300, and a stopper 400.

  FIG. 2 shows the shapes of the valve main body 100, the valve body 200, the spring 300, and the stopper member 400 constituting the check valve.

FIG. 3 is an explanatory view showing details of the valve body 100.
The valve body 100 is made of a metal material, has an outer cylinder part 110 and an inner cylinder part 120, and is provided with a refrigerant inlet 130 at the bottom.

FIG. 4 is an explanatory view showing details of the valve body 200.
The valve body 200 is made of, for example, resin. The valve body 200 includes a base portion 210 having a substantially square planar shape and a cylindrical portion 220.
An arcuate stopper contact portion 222 is provided between the cylindrical portion 220 and the base portion 210. The side surface of the valve body 200 in the cylindrical portion 220 and the stopper abutting portion 222 is open to the annular gap 200a on the inner cylindrical surface side of the cylindrical portion 120 that communicates with the inlet 130 that is opened when the valve body 200 is lifted. lower half portion is the upper half portion isosceles triangle such be concave (hereinafter, simply referred to as "isosceles triangle recess") in a square and 230 are provided, a pair of tapered surfaces on the top of the isosceles triangle recess 230 230a is formed. When the cylindrical portion 220 is lifted from the upper surface of the stopper member 400, the refrigerant outflow path by the opening 230b formed between the pair of tapered surfaces 230a of the isosceles triangular recess 230 and the upper surface of the stopper member 400 according to the lift amount. The cross-sectional area will gradually increase. That is, there is no sudden change in the cross-sectional area of the refrigerant gas outflow channel to the downstream side of the valve body 200 when the valve body 200 is lifted with a simple structure in which the isosceles triangular recess 230 is provided on the side surface of the valve body 200. A sudden change in the differential pressure can be prevented.
The base 210 has four protrusions 212, and these protrusions 212 form a guide in the inner cylinder 120 of the valve body 100 of the valve body 200.

FIG. 5 is an explanatory view showing details of the stopper member 400.
The stopper member 400 is configured by an annular plate-shaped ring member 410 having a circular opening 420 through which the cylindrical portion 220 of the valve body 200 is inserted, and the lift amount of the valve body 200 inserted through the ring member 410. Accordingly , an opening 230b is formed between the upper surface of the circular opening 420 and the isosceles triangular recess 230 of the valve body 200 so as to gradually increase the refrigerant outflow passage cross-sectional area .

FIG. 6 shows the assembled state of the check valve 10 of the present invention.
The valve body 200 is inserted into the inner cylindrical portion 120 of the valve body 100, and the stopper member 400 is placed with the coil spring 300 interposed therebetween.

The upper end portion of the inner cylinder portion 120 is bent inward to form a bent portion 122, and the stopper member 400 is fixed. In response to the spring force of the coil spring 300, the valve body 200 is constantly urged in a direction to close the refrigerant inlet 130 of the valve body 100.
The assembled check valve 10 is press-fitted into the opening 2 of the compressor 1 using the stepped portion 112 of the outer cylinder portion 110. Since the valve body 100 is made of a metal material, the check valve can be fixed to the compressor housing by press-fitting. The stopper member 400 may be fixed with a general retaining ring or the like.

Next, the operation of the check valve of the present invention will be described.
FIG. 6 shows a case where the discharge pressure of the compressor is absent or small, and the valve body 200 pushed by the coil spring 300 closes the refrigerant inlet 130 of the valve body 100.

FIG. 7 shows a state in which the refrigerant given pressure from the inlet 130 flows.
The valve body 200 that has received the pressure of the refrigerant lifts against the spring force of the coil spring 300. The cylindrical portion 220 of the valve body 200 rises along the opening 420 of the stopper member 400. Two isosceles triangular recesses 230 are provided at the center of the cylindrical portion 220, and an opening formed between the tapered surface 230 a formed by the isosceles triangular recess 230 and the opening 420 of the stopper member 400. through 230b, the refrigerant as indicated by the arrow _{F 1} flows out.

FIG. 8 shows a state where the valve body 200 is lifted to the maximum.
The valve body 200 stops the lift when the arc-shaped stopper contact portion 222 contacts the stopper member 400. In this state, the opening area of the opening 230b formed between the tapered surface 230a formed by the isosceles triangular recess 230 of the valve body 200 and the opening 420 of the stopper member 400 is maximized.
When the discharge pressure of the refrigerant decreases, the state returns to the state of FIG. 6 and the reverse flow of the refrigerant is prevented.

FIG. 9 shows another embodiment of another check valve of the present invention.
The check valve 10a includes a valve main body 100a, a valve body 200, a spring 300, and a stopper 400.
The valve body 100a is made of a metal material and has a cylindrical portion 110a that houses the valve body 200.
The check valve 10a is mounted by press-fitting the cylinder portion 110a into the opening of the housing 1 of the compressor.
The configuration of the valve body 200, the spring 300, and the stopper 400 is the same as that of the above-described embodiment, and the description thereof is omitted.

  As described above, the check valve of the present invention can complete an assembly with a simple structure, and the specification can be easily changed according to the structure of the mounting portion on the compressor side.

Explanatory drawing which shows the attachment structure of the non-return valve of this invention. The component diagram which comprises the non-return valve of this invention. Explanatory drawing which shows the detail of a valve main body. Explanatory drawing which shows the detail of a valve body. Explanatory drawing which shows the detail of a stopper member. Explanatory drawing which shows the assembly state of a non-return valve. Explanatory drawing which shows the effect | action of a non-return valve. Explanatory drawing which shows the effect | action of a non-return valve. Explanatory drawing which shows the other Example of the non-return valve of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Check valve 100 Valve main body 110 Outer cylinder part 120 Inner cylinder part 122 Caulking part 130 Refrigerant inflow port 200 Valve body 300 Coil spring 400 Stopper member

Claims (2)

A check valve for a refrigerant mounted in an opening of a housing of a compressor of a refrigeration cycle, the valve main body having a bottomed cylinder part and a refrigerant inlet provided at the bottom of the cylinder part, and the cylinder A stopper member attached to the opening end of the part and a slidably accommodated axially in the cylindrical part, and a refrigerant outflow passage for allowing the refrigerant to flow out is formed between the stopper member and the lift from the inlet In a check valve comprising: a valve body that changes an opening area of the refrigerant outflow passage according to an amount; and a spring that biases the valve body toward the inlet.
The stopper member, the cylindrical portion of the valve body is constituted by an annular plate-shaped ring member having a circular opening that is inserted slidably in the axial direction, the side surface of said valve body, said valve An isosceles triangular recess opened to the annular gap on the inner cylindrical surface side of the cylindrical portion that communicates with the inflow port when the body is lifted, and the lift amount of the valve body from the inflow port is increased. Accordingly , the check valve is configured so that a refrigerant cross-sectional area between the valve body and the stopper member increases .   The check valve according to claim 1, wherein the valve body is formed of a metal material, and the stopper member is attached to the cylinder portion by bending an opening end of the cylinder portion inward.

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