JP4335705B2 - 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.
Japanese Patent Laid-Open No. 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, the check valve of the present invention comprises:
A valve body having a bottomed cylindrical portion and a refrigerant inlet provided at the bottom of the cylindrical portion ;
A stopper member attached to the open end of the cylindrical portion;
A refrigerant flow path that is slidably accommodated in the axial direction in the cylindrical portion and that allows a refrigerant to flow out between the stopper member and an opening area of the refrigerant flow path according to a lift amount from the inflow port is formed. A variable valve body,
A spring that biases the valve body toward the inflow port;
With
The stopper member is formed into a bottomed cylindrical shape and is inserted and fixed to the cylindrical portion so that the bottom portion is on the opening end side of the cylindrical portion, and the inside of the stopper member communicates with the opening end side of the cylindrical portion. A slit to be formed is formed on the peripheral wall of the stopper member, and a protrusion is provided on the inner surface of the peripheral wall on the opening end side,
The valve body is inserted into the stopper member, and a cutout portion is provided on the outer peripheral portion to engage with the protruding portion, and the cutout portion is formed to expand toward the bottom side of the tube portion. The refrigerant flow path is formed between the protrusion and the protrusion.

And the said valve main body is formed with the metal material, The said stopper member was attached to the said cylinder part by bending the opening end of the said cylinder part inside.

  The check valve of the present invention has a simple structure as described above, and the dimensions and the like can be easily changed in accordance with the structure of the mounting 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 four notches 214 and a cylindrical portion 220.
A circular arc part 212 is provided between the cylindrical part 220 and the notch part 214 of the base part 210. A boss 222 serving as a receiving portion is provided at the center of the bottom of the cylindrical portion 220. An opening 212b serving as a refrigerant flow path is formed between the notch 214 having the arc surface 212a and the stopper member 400.

FIG. 5 is an explanatory view showing details of the stopper member 400.
The stopper member 400 includes a cylindrical member 410 and includes four slit-shaped openings 420 that open to the refrigerant outflow side and four protrusions 430 on the refrigerant inflow side.

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 a coil spring 300 (not shown) 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.
The base 210 is provided with a circular arc portion 212, through an opening 212b formed between the protrusion 430 provided on the arcuate surface 212a and the stopper member 400, the refrigerant as indicated by the arrow _{F 1} outflow To do.

FIG. 8 shows a state where the valve body 200 is lifted to the maximum.
In the valve body 200, the upper part of the base 210 abuts against the stopper member 400, and the lift stops. In this state, the opening area of the opening 212b formed between the arc surface 212a formed by the arc portion 212 of the valve body 200 and the protruding portion 430 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 refrigerant check valve attached to the opening of the compressor housing of the refrigeration cycle,
A valve body having a bottomed cylindrical portion and a refrigerant inlet provided at the bottom of the cylindrical portion ;
A stopper member attached to the open end of the cylindrical portion;
A refrigerant flow path that is slidably accommodated in the axial direction in the cylindrical portion and that allows a refrigerant to flow out between the stopper member and an opening area of the refrigerant flow path according to a lift amount from the inflow port is formed. A variable valve body,
A spring that biases the valve body toward the inflow port;
With
The stopper member is formed into a bottomed cylindrical shape and is inserted and fixed to the cylindrical portion so that the bottom portion is on the opening end side of the cylindrical portion, and the inside of the stopper member communicates with the opening end side of the cylindrical portion. A slit to be formed is formed on the peripheral wall of the stopper member, and a protrusion is provided on the inner surface of the peripheral wall on the opening end side,
The valve body is inserted into the stopper member, and a cutout portion is provided on the outer peripheral portion to engage with the protruding portion, and the cutout portion is formed to expand toward the bottom side of the tube portion. And the refrigerant flow path is formed between the protruding portion and the check valve. 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 the opening end of the cylinder portion inward.

Images