KR20230098437A - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor, comprising: a motor generating power; a rotation shaft rotated by the motor; an orbiting scroll that is pivotally moved by the rotation shaft; and a fixed scroll meshed with the orbiting scroll to form a compression chamber, wherein the fixed scroll is in contact with and spaced apart from an outlet for discharging the refrigerant in the compression chamber, a valve seat surrounding the outlet, and the valve seat. A discharge valve that opens and closes a discharge port and a groove formed to be intaglio from the valve seat and at least partially overlapping the discharge valve in an axial direction, wherein the groove area, which is the area of the base surface of the groove, is the area of the front end surface of the valve seat. As it is formed larger than the in-valve seat area, noise, wear and damage caused by the discharge valve can be reduced.

Description

Scroll Compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more particularly, to a scroll compressor capable of reducing noise and improving durability.

In general, an air conditioning unit (A/C) for cooling and heating the interior of a vehicle is installed. As a component of a cooling system, such an air conditioner includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant introduced from an evaporator into a high-temperature, high-pressure gaseous refrigerant and sends it to a condenser.

Compressors include a reciprocating type that compresses refrigerant according to the reciprocating motion of a piston and a rotary type that compresses refrigerant while rotating. In the reciprocating type, there is a crank type that uses a crank to transmit to a plurality of pistons according to the transmission method of the drive source, a swash plate type that transmits to a rotating shaft with a swash plate installed, and the like. There are scrolling types that use orbiting scrolls and fixed scrolls.

Scroll compressors are widely used for refrigerant compression in air conditioners, etc., because of the advantages of obtaining a relatively high compression ratio compared to other types of compressors and obtaining stable torque by smooth refrigerant suction, compression, and discharge strokes.

The scroll compressor includes a housing, a motor provided inside the housing, a rotation shaft rotated by the motor, an orbiting scroll rotated by the rotation shaft, and a stationary fixed to the housing and engaged with the orbiting scroll to form a compression chamber. Include scrolling.

Here, the fixed scroll, as shown in FIGS. 1 to 3, a discharge port 54 for discharging the refrigerant in the compression chamber, a valve seat 55 surrounding the discharge port 54, and the valve seat 55 ) and a discharge valve 57 that is in contact with and spaced apart from and opens and closes the discharge port 54.

The discharge valve 57 includes a cantilever-shaped discharge lead 572 and a valve retainer 574 limiting the amount of opening of the discharge lead 572 .

The fixed scroll further includes an annular groove 562 formed to be more concave than the valve seat 55 and at least partially overlapping the discharge lead 572 in the axial direction.

In the conventional scroll scroll compressor according to this configuration, when power is applied to the motor, the rotational shaft is rotated by the motor, the orbiting scroll receives rotational force from the rotational shaft and rotates, and the compression chamber moves toward the center. As it moves continuously, its volume decreases. Then, the refrigerant flows into the compression chamber and is compressed while moving toward the center along the movement path of the compression chamber and discharged through the discharge port 54 . And, the refrigerant discharged from the outlet 54 is discharged to the outside of the housing.

In this process, the annular groove 562 reduces the contact area between the discharge lead 572 and the valve seat 55 to reduce impact noise caused by the discharge lead 572, and the annular groove 562 The oil stored in buffers the shock caused by the discharge lead 572 to reduce impact noise and suppress wear and damage of the valve seat 55 and the discharge lead 572 .

However, in such a conventional scroll scroll compressor, noise, wear and damage caused by the discharge valve 57 are not sufficiently reduced despite the oil groove 562 being provided.

Japanese Unexamined Patent Publication No. 2018-053827

Accordingly, an object of the present invention is to provide a scroll compressor capable of reducing noise, wear and damage caused by the discharge valve.

The present invention, to achieve the object as described above, a motor for generating power; a rotation shaft rotated by the motor; an orbiting scroll that is pivotally moved by the rotation shaft; and a fixed scroll meshed with the orbiting scroll to form a compression chamber, wherein the fixed scroll is in contact with and spaced apart from an outlet for discharging the refrigerant in the compression chamber, a valve seat surrounding the outlet, and the valve seat. A discharge valve that opens and closes a discharge port and a groove formed to be intaglio from the valve seat and at least partially overlapping the discharge valve in an axial direction, wherein the groove area, which is the area of the base surface of the groove, is the area of the front end surface of the valve seat. A scroll compressor formed larger than the in-valve seat area is provided.

The groove area may be 1.9 times the valve seat area.

The groove area may be 0.4 times the area of the discharge port, and the valve seat area may be 0.2 times the area of the discharge port.

The valve seat is formed in an annular shape with an inner diameter equal to the diameter of the outlet, the groove is formed in an annular shape with an inner diameter equal to the outer diameter of the valve seat, and the outer diameter of the valve seat and the inner diameter of the groove are equal to the diameter of the outlet. It can be formed by 1.1 times.

The outer diameter of the groove may be 1.27 to 1.28 times the diameter of the outlet.

At least a portion of the groove may include a concave-convex surface having a predetermined roughness.

The uneven surface may be formed by shot blasting.

The groove may include an annular groove extending along a circumferential direction of the valve seat at an opposite side of the discharge hole based on the valve seat.

The groove may further include a straight groove that crosses the valve seat in a radial direction from the annular groove to the discharge port.

The straight grooves may be formed in plurality, and the plurality of straight grooves may be arranged in a circumferential direction of the valve seat.

A scroll compressor according to the present invention includes a motor generating power; a rotation shaft rotated by the motor; an orbiting scroll that is pivotally moved by the rotation shaft; and a fixed scroll meshed with the orbiting scroll to form a compression chamber, wherein the fixed scroll is in contact with and spaced apart from an outlet for discharging the refrigerant in the compression chamber, a valve seat surrounding the outlet, and the valve seat. A discharge valve that opens and closes a discharge port and a groove formed to be intaglio from the valve seat and at least partially overlapping the discharge valve in an axial direction, wherein the groove area, which is the area of the base surface of the groove, is the area of the front end surface of the valve seat. As it is formed larger than the in-valve seat area, noise, wear and damage caused by the discharge valve can be reduced.

1 is a perspective view showing a fixed scroll and a discharge valve partially cut away in a conventional scroll compressor;
2 is a plan view showing a discharge port, a valve seat and a groove in the fixed scroll of FIG. 1;
3 is a cross-sectional view along line Ⅰ-Ⅰ of FIG. 2;
4 is a plan view showing a discharge port, a valve seat, and a groove of a fixed scroll in a scroll compressor according to an embodiment of the present invention;
5 is a cross-sectional view along line II-II of FIG. 4;
6 is a cross-sectional view showing a discharge port, a valve seat, and a groove of a fixed scroll in a scroll compressor according to another embodiment of the present invention;
7 is a perspective view showing a discharge port, a valve seat, and a groove of a fixed scroll in a scroll compressor according to another embodiment of the present invention;
Figure 8 is a plan view of Figure 7;
9 is a cross-sectional view along line III-III of FIG. 8 .

Hereinafter, a scroll compressor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a plan view illustrating a discharge port, a valve seat, and a groove of a fixed scroll in a scroll compressor according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line II-II of FIG. 4 .

A scroll compressor according to an embodiment of the present invention includes a housing, a motor generating power inside the housing, a rotation shaft rotated by the motor, an orbiting scroll rotated by the rotation shaft, and compression geared to the orbiting scroll. It may include a fixed scroll 5 forming a yarn.

The housing includes a center housing, a front housing fastened to one side of the center housing and forming a motor accommodating space in which the motor is accommodated, and a scroll fastened to the other side of the center housing and accommodates the orbiting scroll and the fixed scroll 5 A rear housing defining an accommodation space and a discharge space accommodating the refrigerant discharged from the compression chamber may be included.

The center housing includes a main frame that divides the motor accommodating space and the scroll accommodating space and supports the orbiting scroll, and a center housing side plate protruding from an outer circumference of the main frame toward the rear housing and supporting the fixed scroll 5 can include

The main frame may be formed in a substantially disk shape, and a shaft hole through which one end of the rotating shaft passes and a back pressure chamber for pressing the orbiting scroll toward the fixed scroll 5 may be formed at a center of the main frame. Here, an eccentric bush converting a rotational motion of the rotational shaft into a rotational motion of the orbiting scroll is formed at one end of the rotation shaft, and the back pressure chamber may provide a space in which the eccentric bush can rotate.

The front housing includes a front housing head plate facing the main frame and supporting the other end of the rotation shaft, and a front housing side plate protruding from an outer circumferential portion of the front housing head plate, fastened to the outer circumference portion of the main frame, and supporting the motor. can do.

The rear housing may include a rear housing head plate facing the main frame and a rear housing side plate protruding from an outer circumference of the rear housing head plate and fastened to the center housing side plate.

The motor may include a stator fixed to the side plate of the front housing and a rotor rotated inside the stator by interaction with the stator.

The rotation shaft may be coupled to the rotor, and one end of the rotation shaft may pass through a shaft hole of the main frame and the other end of the rotation shaft may be supported by the front housing head plate.

The orbiting scroll is interposed between the main frame and the fixed scroll 5, and includes a disc-shaped orbiting scroll head plate, an orbiting scroll wrap protruding from the center of the orbiting scroll head toward the fixed scroll 5, and the orbiting scroll head plate. It protrudes from the center of the orbiting scroll to the opposite side of the wrap and may include an orbiting scroll boss engaged with the eccentric bush.

The fixed scroll 5 includes a disc-shaped fixed scroll head plate 52, a fixed scroll wrap protruding from the center of the fixed scroll head plate 52 and meshing with the orbiting scroll wrap, and refrigerant in the compression chamber to the discharge space. It may include a discharge port 54 for discharging and a discharge valve 57 for opening and closing the discharge port 54 .

Here, the discharge port 54 extends from the first surface (compression chamber side) of the fixed scroll head plate 52 at the center of the fixed scroll head plate 52 to the second surface 52b ( A cylindrical hole penetrating the fixed scroll head plate 52 to the surface side of the discharge space) may be formed, and an exit portion (a boundary portion with the second surface 52b) may be chambered as shown in FIG. 5 .

And, referring to FIG. 1, the discharge valve 57 includes a cantilever-shaped discharge lead 572 and a valve retainer 574 limiting the opening amount of the discharge lead 572, and the discharge lead ( 572 may include a disk-shaped head portion 572a that opens and closes the outlet 54 .

Meanwhile, as shown in FIGS. 4 and 5 , the fixed scroll 5 includes a valve seat 55 surrounding the discharge port 54 to reduce noise and damage when the discharge lead 572 is hit. An annular groove 562 formed to be more concave than the valve seat 55 and at least partially overlapping the discharge lead 572 in the axial direction may be included.

Here, the annular groove 562 is engraved on the second surface 52b of the fixed scroll head plate 52 at a position spaced apart from the discharge port 54 and is formed to extend along the circumferential direction of the discharge port 54, Accordingly, a valve seat 55 extending in a circumferential direction of the discharge hole 54 may be formed between the discharge hole 54 and the annular groove 562 .

At this time, the inner diameter (ID55) of the valve seat 55 is the same as the diameter (D54) of the outlet 54, and the outer diameter (OD55) of the valve seat 55 is the inner diameter (ID562) of the annular groove 562. , and the outer diameter of the head portion 572a of the discharge lead 572 is larger than the outer diameter OD55 of the valve seat 55 and the inner diameter ID562 of the annular groove 562. It may be formed smaller than the outer diameter (OD562).

Hereinafter, operational effects of the scroll compressor according to the present embodiment will be described.

That is, when power is applied to the motor, the rotating shaft may rotate together with the rotor. In addition, the orbiting scroll may be rotated by receiving rotational force from the rotational shaft through the eccentric bush. Accordingly, the volume of the compression chamber may be reduced while continuously moving toward the center side. And, the refrigerant introduced into the housing from the outside of the housing may flow into the compression chamber. In addition, the refrigerant sucked into the compression chamber may be compressed while moving toward the center along the moving path of the compression chamber and discharged into the discharge space through the discharge port 54 . And, the refrigerant in the discharge space may be guided to the outside of the housing through the discharge port.

In this process, the discharge lead 572 of the discharge valve 57 repeats deformation and restoration according to the pressure in the compression chamber and is spaced apart from and in contact with the valve seat 55 to open and close the discharge port 54. there is.

At this time, the valve seat 55 and the annular groove 562 are formed, and the outer diameter of the head portion 572a of the discharge lead 572 is the outer diameter OD55 of the valve seat 55 and the annular groove ( 562) and smaller than the outer diameter OD562 of the annular groove 562, the contact area between the discharge lead 572 and the valve seat 55 is reduced, and the discharge lead ( 572) can reduce noise.

In addition, oil is stored in the annular groove 562, and the oil in the annular groove 562 absorbs the shock caused by the blow of the discharge lead 572, so that noise is further reduced and the discharge lead 572 ) and the wear and tear of the valve seat 55 can be suppressed.

In addition, as the foreign matter contained in the refrigerant discharged from the discharge port 54 is collected in the annular groove 562 and then discharged to the discharge space, there is a gap between the discharge lead 572 and the valve seat 55. Foreign matter can be prevented from being caught. Accordingly, leakage of the refrigerant in the compression chamber due to foreign matter being stuck and wear and damage of the discharge lead 572 and the valve seat 55 can be prevented.

Here, in the scroll compressor according to the present embodiment, the outer diameter (OD55) of the valve seat 55 and the inner diameter (ID562) of the annular groove 562 are reduced compared to the prior art, so that the base surface of the annular groove 562 ( 5622) (the area of the annular groove 562 shown in FIG. 4), the area of the front end surface 552 of the valve seat 55 (the area of the valve seat 55 shown in FIG. 4) It may be formed larger than the valve seat area. As a result, a contact area between the discharge lead 572 and the valve seat 55 is further reduced, so that noise caused by hitting the discharge lead 572 can be further reduced. In addition, a large amount of oil is stored in the annular groove 562, and the buffer effect of the oil in the annular groove 562 is further increased, so that not only noise is further reduced, but also the discharge lead 572 and the valve Wear and damage of the seat 55 can be further suppressed.

For reference, there may be several ways to form the area of the annular groove larger than the area of the valve seat.

For example, the diameter D54 of the outlet 54, the inner diameter ID55 of the valve seat 55, the outer diameter OD55 of the valve seat 55, and the inner diameter ID562 of the annular groove 562 are There may be a method of increasing the outer diameter OD562 of the annular groove 562 in the conventionally formed state. However, in this case, although the annular groove area is increased and a large amount of oil is stored in the annular groove 562, the amount of oil in contact with the discharge lead 572 is not increased compared to the prior art, so that the annular groove ( 562) does not increase the buffering effect by the oil. In addition, the contact area between the discharge lead 572 and the valve seat 55 is not reduced compared to the prior art, so noise caused by hitting the discharge lead 572 is not reduced.

As another example, the inner diameter (ID55) of the valve seat 55, the outer diameter (OD55) of the valve seat 55, the inner diameter (ID562) of the annular groove 562 and the outer diameter (OD562) of the annular groove 562 are conventionally There may be a way to increase the diameter D54 of the discharge port 54 in the state formed as described above. However, in this case, although the contact area between the discharge reed 572 and the valve seat 55 is reduced because the valve seat area is reduced, the dead volume by the discharge port 54 is increased. In addition, since the amount of oil in the annular groove 562 is not increased compared to the prior art, the buffering effect of the oil in the annular groove 562 is not increased.

Therefore, considering these problems, as in the present embodiment, the diameter D54 of the discharge port 54, the inner diameter ID55 of the valve seat 55, and the outer diameter OD562 of the annular groove 562 are the conventional The outer diameter (OD55) of the valve seat 55 and the inner diameter (ID562) of the annular groove 562 are reduced compared to the prior art in the state in which the annular groove area is formed larger than the valve seat area. may be desirable.

Here, the outer diameter (OD55) of the valve seat 55 and the inner diameter (ID562) of the annular groove 562 are formed to be 1.1 times the diameter (D54) of the discharge hole 54, and the outer diameter of the annular groove 562 (OD562) is formed to be 1.27 to 1.28 times the diameter (D54) of the discharge port 54, the valve seat area is formed to be 0.2 times the area of the discharge port 54, and the annular groove area is formed to be 0.2 times the area of the discharge port 54. ), so that the annular groove area is 1.9 times the valve seat area.

Meanwhile, in the present embodiment, the base surface 5622 of the annular groove 562 is formed as a flat surface, but may be formed as a concave-convex surface R having a predetermined roughness as shown in FIG. 6 . In this case, the contact area between the oil and the annular groove 562 is increased, so that the oil is easily adsorbed on the concave-convex surface R, and the oil is more easily stored in the annular groove 562. A buffering effect can be easily ensured.

Here, the uneven surface R may be formed by, for example, shot blasting. In addition, the uneven surface R may be formed on the entire base surface 5622 of the annular groove 562, or may be formed on a part of the base surface 5622 of the annular groove 562, and the annular groove ( 562) may be formed on at least a part of the inner circumferential surface and the outer circumferential surface.

Meanwhile, in the present embodiment, only the annular groove 562 is included, but other grooves may also be formed as shown in FIGS. 7 to 9 .

Specifically, referring to FIGS. 7 to 9, the fixed scroll 5 includes a groove 56 formed to be more concave than the valve seat 55 and at least partially overlapping the discharge valve 57 in the axial direction, The groove 56 is an annular groove 562 extending along the circumferential direction of the valve seat 55 on the opposite side of the discharge port 54 based on the valve seat 55 and the discharge port from the annular groove 562. It may include a straight groove 564 that radially crosses the valve seat 55 up to (54).

The annular groove 562 may be formed similarly to the above-described embodiment. That is, the valve seat 55 in a state in which the diameter D54 of the discharge port 54, the inner diameter ID55 of the valve seat 55, and the outer diameter OD562 of the annular groove 562 are formed as in the prior art. The outer diameter OD55 and the inner diameter ID562 of the annular groove 562 are reduced compared to the prior art, so that the annular groove area may be larger than the valve seat area.

On the other hand, since the straight grooves 564 are formed in plural, and the plurality of straight grooves 564 are arranged along the circumferential direction of the valve seat 55, the valve seat 55 is similar to the above-described embodiment. It may be formed somewhat differently.

In this case, compared to the above-described embodiment, the area of the valve seat 55 is reduced and the area of the groove is increased, so that the noise caused by hitting the discharge lead 572 is further reduced, and the buffering effect by oil is improved. can be further increased.

Here, even if the linear groove 564 is formed, refrigerant leakage may be prevented by oil filled in the linear groove 564 .

In addition, the concave-convex surface R of the above-described embodiment may be formed not only in the annular groove 562 but also in the linear groove 564 .

5: fixed scroll
54: discharge port
55: valve seat
56: groove
57: discharge valve
552: end surface
562: annular groove
564: straight groove
5622: basal plane
D54: Diameter of outlet
ID55: inner diameter of valve seat
ID562: inner diameter of annular groove
OD55: outer diameter of valve seat
OD562: outer diameter of annular groove
R: uneven surface

Claims (10)

a motor that generates power;
a rotation shaft rotated by the motor;
an orbiting scroll that is pivotally moved by the rotation shaft; and
Including; a fixed scroll meshed with the orbiting scroll to form a compression chamber;
The fixed scroll has a discharge port for discharging the refrigerant in the compression chamber, a valve seat surrounding the discharge port, a discharge valve contacting and spaced apart from the valve seat and opening and closing the discharge port, and formed to be concave from the valve seat, and at least a part thereof Includes a groove overlapping the discharge valve in the axial direction;
A scroll compressor wherein a groove area, which is an area of a base surface of the groove, is larger than a valve seat area, which is an area of a front end surface of the valve seat. According to claim 1,
Wherein the groove area is 1.9 times the valve seat area. According to claim 2,
The groove area is formed to be 0.4 times the area of the discharge port,
The valve seat area is 0.2 times the area of the discharge port scroll compressor. According to claim 1,
The valve seat is formed in an annular shape with an inner diameter equal to the diameter of the discharge port,
The groove is formed in an annular shape with an inner diameter equal to the outer diameter of the valve seat,
The outer diameter of the valve seat and the inner diameter of the groove are formed to be 1.1 times the diameter of the discharge port. According to claim 4,
The outer diameter of the groove is formed to be 1.27 to 1.28 times the diameter of the discharge port. According to claim 1,
At least a portion of the groove includes a concave-convex surface having a predetermined roughness. According to claim 6,
The concave-convex surface is a scroll compressor formed by shot blasting. According to claim 1,
The groove is a scroll compressor comprising an annular groove extending along a circumferential direction of the valve seat at an opposite side of the discharge port relative to the valve seat. According to claim 8,
The groove further comprises a straight groove crossing the valve seat in a radial direction from the annular groove to the discharge port. According to claim 9,
The linear grooves are formed in plurality, and the plurality of linear grooves are arranged in a circumferential direction of the valve seat scroll compressor.

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