KR20240105631A - Scroll compressor - Google Patents

Abstract

In the present invention, a scroll compressor is introduced in which back pressure control is performed and at the same time the sealing performance of the back pressure chamber is maintained, and the power to move the orbiting scroll in the axial direction is secured along with the sealing function, thereby stabilizing the structure and reducing vibration.

Description

Scroll compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more specifically, to a scroll compressor in which back pressure control is performed and at the same time the sealing performance of the back pressure chamber is maintained, and in addition to the sealing function, the force of the orbiting scroll to move in the axial direction is canceled out.

In general, a scroll compressor is a component of an air conditioning device for cooling and heating, and is one of the compressors that sucks low-temperature and low-pressure refrigerant from an evaporator, compresses it into high-temperature and high-pressure refrigerant, and discharges it to a condenser.

This scroll compressor includes a housing with an intake port, a rotating shaft connected to and rotating with a rotor formed inside a stator installed inside the housing, an orbiting scroll connected to the rotating shaft and rotating, and a pair of compression chambers engaged with the orbiting scroll. It consists of a fixed scroll forming a fixed scroll, a main frame that is coupled to the fixed scroll with an orbiting scroll in between and is seated in the housing, an anti-rotation mechanism that prevents the rotation of the orbiting scroll, and a top cap in which an oil separator and an outlet are formed. The operation of the scroll compressor is as follows.

The refrigerant gas sucked through the intake port is moved to a compression chamber formed by engaging the orbiting scroll and the fixed scroll and is compressed.

The compressed refrigerant gas is discharged from the central part of the fixed scroll, and the oil mixed with the refrigerant gas is separated through an oil separator and moves to the storage tank, and the refrigerant gas is discharged to the outside through the discharge port.

At this time, leakage occurs due to gas forces in the tangential, axial, and radial directions caused by the pressure of the compressed refrigerant gas. Among various structures to reduce leakage, one is used to reduce leakage due to axial gas force. There are fixed scroll back pressure method, orbiting scroll back pressure method, and top seal method.

In particular, in the case of the back pressure method, a back pressure hole communicating with the back pressure chamber is formed at a predetermined position of the fixed scroll, and the refrigerant gas of medium pressure enters the back pressure chamber through the back pressure hole, and the orbiting scroll is brought into close contact with the fixed scroll side by the pressure, thereby discharging the refrigerant. This prevents gas leakage.

However, as the conventional scroll compressor was introduced to prevent leakage of refrigerant gas by simply adding a sealing member, the sealing performance deteriorates and the orbiting scroll does not move stably in the axial direction, which results in unstable structure and increased vibration. There is.

The matters described as background technology above are only for the purpose of improving understanding of the background of the present invention, and should not be taken as recognition that they correspond to prior art already known to those skilled in the art.

KR 10-0564968 B1 (2006.03.21)

The present invention was proposed to solve this problem, and the sealing performance of the back pressure chamber is maintained while controlling the back pressure. In addition to the sealing function, the force of the orbiting scroll to move in the axial direction is offset to stabilize the structure and reduce vibration. The purpose is to provide a scroll compressor that reduces energy consumption.

A scroll compressor according to the present invention for achieving the above object includes a motor housing and a main frame mounted on the motor housing; A drive shaft connected to a motor provided inside the motor housing and rotated by receiving rotational force from the motor; A turning scroll is provided on the main frame, is connected to the drive shaft, rotates, and has a spiral-shaped turning wrap on one side and an insertion groove on the other side. a fixed scroll provided with a spiral-shaped fixed wrap that engages in response to the orbiting wrap of the orbiting scroll; A thrust plate disposed between the orbiting scroll and the main frame; and a sealing member inserted into the insertion groove of the orbiting scroll between the orbiting scroll and the thrust plate. A back pressure chamber is formed on the other side of the orbiting scroll inside the main frame, and when the pressure in the back pressure chamber flows into the insertion groove, the sealing member is inserted into the insertion groove of the orbiting scroll. The member is press-fitted into the insertion groove.

The insertion groove of the orbiting scroll is characterized in that its depth gradually decreases as it goes outward.

The insertion groove of the orbiting scroll is characterized by being composed of a first receiving portion in which a sealing member is provided, and a second receiving portion that extends outward from the first receiving portion and has an inclined surface as the depth gradually decreases toward the outside.

The sealing member is provided in the first accommodating part, and is press-fitted as it moves toward the second accommodating part when pressure inflows from the back pressure chamber and comes into close contact with the second accommodating part and the thrust plate.

A scroll compressor, characterized in that the sealing member is formed with a guide surface having an inclination to match the incline surface of the second receiving portion.

The scroll compressor with the above-described structure maintains the sealing performance of the back pressure chamber while controlling the back pressure, and along with the sealing function, the force of the orbiting scroll to move in the axial direction is offset to stabilize the structure and reduce vibration.

1 is a diagram showing a scroll compressor according to an embodiment of the present invention.
FIG. 2 is a view showing the orbiting scroll and thrust plate of the scroll compressor shown in FIG. 1.
FIG. 3 is a view for explaining a sealing member in the scroll compressor shown in FIG. 1.
FIG. 4 is a diagram for explaining the movement of a sealing member in the scroll compressor shown in FIG. 1.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted.

The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves.

In describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that it does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, a scroll compressor according to a preferred embodiment of the present invention will be described with reference to the attached drawings.

FIG. 1 is a view showing a scroll compressor according to an embodiment of the present invention, FIG. 2 is a view showing an orbiting scroll and a thrust plate of the scroll compressor shown in FIG. 1, and FIG. 3 is a view showing the scroll compressor shown in FIG. 1. This is a drawing for explaining the sealing member, and FIG. 4 is a drawing for explaining the movement of the sealing member in the scroll compressor shown in FIG. 1.

As shown in Figures 1 and 2, the scroll compressor according to the present invention includes a motor housing 10 and a main frame 20 mounted on the motor housing 10; A drive shaft (30) connected to the motor (M) provided inside the motor housing (10) and rotated by receiving rotational force from the motor (M); A turning scroll (40) is provided on the main frame (20), is connected to the drive shaft (30), rotates, and has a spiral-shaped turning wrap (41) on one side and an insertion groove (42) formed on the other side; a fixed scroll (50) provided with a spiral-shaped fixed wrap (51) that engages with the orbiting wrap (41) of the orbiting scroll (40); A thrust plate (60) disposed between the orbiting scroll (40) and the main frame (20); and a sealing member 70 inserted into the insertion groove 42 of the orbiting scroll 40 between the orbiting scroll 40 and the thrust plate 60.

The main frame 20 is coupled to the motor housing 10, and the orbiting scroll 40 is mounted inside the main frame 20 to achieve scroll compression. In addition, a motor (M) that receives power and generates rotational power is provided inside the motor housing (10), and the drive shaft (30) is connected to the motor (M) and rotated by the operation of the motor (M). This drive shaft 30 is connected to the orbiting scroll 40 and rotates together with the drive shaft 30, and the orbiting scroll 40 is provided with a spiral-shaped orbiting wrap 41.

Meanwhile, the fixed scroll 50 is positioned to correspond to the orbiting scroll 40 inside the main frame 20 and is provided to engage with the orbiting scroll 40. This fixed scroll 50 is provided with a spiral-shaped fixed wrap 51 arranged to engage between the orbiting wraps 41 of the orbiting scroll 40, so that a compression chamber is formed between the fixed wrap 51 and the orbiting wrap 41. As a result, when the orbiting scroll 40 rotates, fluid containing refrigerant and oil flows into the compression chamber, and as the orbital wrap 41 rotates, the space in the compression chamber decreases, and the fluid is compressed and discharged.

Meanwhile, a back pressure chamber 21 is formed between the main frame 20 and the orbiting scroll 40, and the back pressure chamber 21 is formed by the pressure within the back pressure chamber 21 on the other side of the orbiting scroll 40. ) is pushed toward the fixed scroll (50).

Meanwhile, the thrust plate 60 is disposed between the orbiting scroll 40 and the main frame 20 to support the force by which the orbiting scroll 40 moves in the axial direction by the pressure transmitted from the back pressure chamber 21. . Here, the pressure transmitted from the back pressure chamber 21 may be the refrigerant gas compressed during scroll compression.

In the present invention, a sealing member 70 is provided between the orbiting scroll 40 and the thrust plate 60, and the sealing member 70 is provided in the insertion groove 42 to prevent separation. As this sealing member 70 is inserted into the insertion groove 42 of the orbiting scroll 40 between the orbiting scroll 40 and the thrust plate 60, the back pressure acting on the orbiting scroll 400 is maintained constant and the back pressure is maintained. The seal 21 is sealed to prevent a decrease in compressor efficiency.

In particular, the sealing member 70 is provided in the insertion groove 42 formed in the orbiting scroll 40 and is press-fitted into the insertion groove 42 when the pressure in the back pressure chamber 21 flows into the insertion groove 42.

That is, in the orbiting scroll 40, the insertion groove 42 is located outside the back pressure chamber 21, so when the pressure of the back pressure chamber 21 is transmitted to the insertion groove 42, the insertion groove 42 is located outside the back pressure chamber 21. The provided sealing member 70 is pressed outward. As a result, the sealing member 70 is moved outward by the pressure of the back pressure chamber 21 flowing into the insertion groove 42, thereby pushing the orbiting scroll 40 in the axial direction, and the orbiting scroll 40 and the thrust plate (60) and sealing performance is improved.

For this purpose, the orbiting scroll 40 may be configured so that a fine gap is formed in the insertion groove 42 when in contact with the thrust plate 60, and the fluid pressure in the back pressure chamber 21 is transmitted through the insertion groove 42 through the fine gap. ), the sealing member 70 can be moved.

Describing the above-described present invention in detail, as shown in FIG. 3, the insertion groove 42 of the orbiting scroll 40 may be formed so that the depth gradually decreases as it goes outward.

In this way, the insertion groove 42 is formed so that the depth gradually decreases in the outward direction, so that when the sealing member 70 provided in the insertion groove 42 moves outward, it is sandwiched between the orbiting scroll 40 and the thrust plate 60. It forms a wedge shape depending on the load.

That is, when the pressure in the back pressure chamber 21 flows into the insertion groove 42 of the orbiting scroll 40, the sealing member 70 moves outward from the insertion groove 42. At this time, the sealing member 70 is provided in the insertion groove 42, and the depth of the insertion groove 42 gradually decreases toward the outside, so that it is sandwiched between the orbiting scroll 40 and the thrust plate 60. Due to this, the sealing member 70 generates a force that pushes the orbiting scroll 40 with respect to the thrust plate 60, so that sealing performance is secured due to the wedge effect even if the sealing member 70 is applied singly.

Accordingly, the insertion groove 42 of the orbiting scroll 40 extends outward from the first accommodating portion 42a and the first accommodating portion 42a in which the sealing member 70 is provided, and the depth gradually decreases as it goes outward. It may be composed of a second receiving portion 42b having an inclined surface S.

In this way, the insertion groove 42 is composed of a first accommodating part 42a and a second accommodating part 42b, and in the case of the first accommodating part 42a, the sealing member 70 is initially positioned, and the sealing member 70 ) may be formed to maintain the assembled state between the orbiting scroll 40 and the thrust plate 60. In the case of the second accommodating part 42b, it extends outward from the first accommodating part 42a, and as the depth gradually extends, it forms an inclined surface S having an angle from one side to the other side toward the outside. In this way, the second accommodating part 42b is formed to be smaller in size compared to the first accommodating part 42a, so that the sealing member 70 can be positioned in the first accommodating part 42a, and the back pressure chamber 21 is formed. When pressure flows into the insertion groove 42 through the sealing member 70, the sealing member 70 moves outward, and the movement of the sealing member 70 is guided along the inclined surface S of the second receiving portion 42b, thereby forming the second receiving portion 42b. It is inserted into (42b).

That is, as shown in FIGS. 3 and 4, the sealing member 70 is provided in the first accommodating part 42a, and is pressed in as it moves toward the second accommodating part 42b when pressure is introduced from the back pressure chamber 21. and comes into close contact with the second receiving portion 42b and the thrust plate 60.

In this way, the sealing member 70 is provided in the first receiving portion 42a to airtightly seal the space between the orbiting scroll 40 and the thrust plate 60, and the orbiting scroll 40 is rotated by driving the motor M to allow the refrigerant to flow. When the pressure flows into the back pressure chamber, the sealing member 70 moves outward as the corresponding pressure flows into the first receiving portion 42a.

At this time, the sealing member 70 is inserted into the second receiving portion 42b, which is formed to gradually decrease in depth as it moves outward, and is sandwiched between the orbiting scroll 40 and the thrust plate 60 to generate an axial support force. Due to this, when pressure is applied in the back pressure chamber 21, the sealing member 70 moves from the first accommodating part 42a to the second accommodating part 42b and forms a shape in which it is fitted, thereby forming the orbiting scroll 40. It is pushed away from the thrust plate 60, and the airtight performance between the orbiting scroll 40 and the thrust plate 60 is improved due to the wedge effect.

Meanwhile, a guide surface 71 having an inclination to match the inclined surface S of the second receiving portion 42b may be formed on the sealing member 70.

In this way, the guide surface 71 matching the inclined surface S of the second accommodating part 42b is formed in the sealing member 70, so that the sealing member 70 is moved from the first accommodating part 42a to the second accommodating part. It is easy to move to (42b) and insert it. That is, when the sealing member 70 moves due to the pressure flowing from the back pressure chamber 21, the sealing member 70 seals by moving the guide surface 71 along the inclined surface S of the second receiving portion 42b. The movement of the member 70 is guided, and the sealing member 70 can be strongly press-fitted between the orbiting scroll 40 and the thrust plate 60.

The scroll compressor with the structure described above maintains the sealing performance of the back pressure chamber 21 while controlling the back pressure, and the structure is stabilized by offsetting the force of the orbiting scroll 40 moving in the axial direction along with the sealing function. and vibration is reduced.

Although the present invention has been shown and described in relation to specific embodiments, it is known in the art that the present invention can be modified and changed in various ways without departing from the technical spirit of the invention as provided by the following claims. It will be self-evident to those with ordinary knowledge.

10:Motor housing
20:Main frame
21: Back pressure room
30: Drive shaft
40: Orbiting scroll
41: Swivel wrap
42: Insertion groove
42a: first receiving portion
42b: second receiving portion
50:Fixed scroll
51: Fixed wrap
60: Thrust plate
70: Sealing member
71: Guide surface
S: slope

Claims (5)

A motor housing and a main frame seated on the motor housing;
A drive shaft connected to a motor provided inside the motor housing and rotated by receiving rotational force from the motor;
A turning scroll is provided on the main frame, is connected to the drive shaft, rotates, and has a spiral-shaped turning wrap on one side and an insertion groove formed on the other side.
a fixed scroll provided with a spiral-shaped fixed wrap that engages in response to the orbiting wrap of the orbiting scroll;
A thrust plate disposed between the orbiting scroll and the main frame; and
It includes a sealing member inserted into the insertion groove of the orbiting scroll between the orbiting scroll and the thrust plate,
A scroll compressor wherein a back pressure chamber is formed on the other side of the orbiting scroll inside the main frame, and when the pressure in the back pressure chamber flows into the insert groove, the sealing member is press-fitted into the insert groove. In claim 1,
A scroll compressor characterized in that the insertion groove of the orbiting scroll is formed so that the depth gradually decreases as it goes outward. In claim 1,
The insertion groove of the orbiting scroll is composed of a first receiving portion in which a sealing member is provided, and a second receiving portion that extends outward from the first receiving portion and has an inclined surface as the depth gradually decreases toward the outside. A scroll compressor. In claim 3,
A scroll compressor, wherein the sealing member is provided in the first accommodating part and is press-fitted as it moves toward the second accommodating part when pressure flows in from the back pressure chamber and comes into close contact with the second accommodating part and the thrust plate. In claim 3,
A scroll compressor, characterized in that the sealing member is formed with a guide surface having an inclination to match the incline surface of the second receiving portion.

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