JP7833564B2 - Scroll compressor - Google Patents

Description

This invention relates to a scroll compressor, and more specifically, to a scroll compressor capable of compressing a refrigerant using a fixed scroll and an orbiting scroll.

Generally, automobiles are equipped with an air conditioning system (A/C) for heating and cooling the interior. Such an air conditioning system is a cooling system that 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.
The compressors mentioned above include reciprocating types, which compress the refrigerant through the reciprocating motion of a piston, and rotary types, which compress the refrigerant while rotating. The reciprocating type includes crank types, which transmit power to multiple pistons using a crank, and swash plate types, which transmit power to a rotating shaft on which a swash plate is installed, depending on the power transmission method. The rotary type includes vane rotary types, which use a rotating rotary shaft and vanes, and scroll types, which use an orbiting scroll and a stationary scroll.
Scroll compressors are widely used for refrigerant compression in air conditioning systems and other applications because they offer advantages such as a relatively high compression ratio compared to other types of compressors, and a smooth connection between the refrigerant intake, compression, and discharge strokes, resulting in stable torque.

Figure 1 is a cross-sectional view showing a conventional scroll compressor, Figure 2 is a perspective view showing the rear housing, fixed scroll, discharge valve, and retainer of the scroll compressor in Figure 1, and Figure 3 is an enlarged cross-sectional view showing portion A of Figure 2.
As shown in the attached Figures 1 to 3, a conventional scroll compressor includes a housing 100, a motor 200 provided inside the housing 100, a rotating shaft 300 that rotates by the motor 200, an orbiting scroll 400 that orbits by the rotating shaft 300, and a fixed scroll 500 that is fixed to the housing 100 and meshes with the orbiting scroll 400 to form a compression chamber.
The housing 100 includes a center housing 110, a front housing 120 fastened to the center housing 110, and a rear housing 130 fastened to the center housing 110 on the opposite side of the front housing 120 with respect to the center housing 110.

The motor 200 is provided in the space formed by the front housing 120 and the center housing 110.
The rotating shaft 300 penetrates the center housing 110 and extends from the motor 200 towards the rear housing 130.
The fixed scroll 500 is provided in the space formed by the rear housing 130 and the center housing 110, and the orbiting scroll 400 is provided in the space formed by the fixed scroll 500 and the center housing 110.

Here, the fixed scroll 500 includes a discharge port 540 for discharging refrigerant from the compression chamber, the rear housing 130 includes a discharge chamber D for containing the refrigerant discharged from the discharge port 540, and a discharge valve 550 for opening and closing the discharge port 540 and a retainer 560 for limiting the opening degree of the discharge valve 550 are fixed to the fixed scroll 500 by fastening bolts.
In a conventional scroll compressor with this configuration, when power is applied to the motor 200, the rotating shaft 300 rotates due to the motor 200, and the orbiting scroll 400 receives rotational force from the rotating shaft 300 and performs an orbital motion, causing the compression chamber to continuously move toward the center and decrease in volume. The refrigerant flows into the compression chamber and is compressed as it moves toward the center along the movement path of the compression chamber. The compressed refrigerant is then discharged into the discharge chamber D through the discharge port 540, which is opened and closed by the discharge valve 550, and then flows out of the housing 100.
However, in such conventional scroll compressors, there was a problem in that noise and vibration were generated when the discharge valve 550 collided with the retainer 560 when opening the discharge port 540.

The present invention aims to provide a scroll compressor that can reduce noise and vibration caused by collisions between the discharge valve and the retainer.

To achieve the above-mentioned objectives, the present invention provides a scroll compressor comprising a housing, a motor provided inside the housing, a rotating shaft rotated by the motor, an orbiting scroll that orbits by the rotating shaft, a stationary scroll that forms a compression chamber together with the orbiting scroll, a discharge valve that opens and closes a discharge port formed in the stationary scroll to discharge the refrigerant from the compression chamber, a retainer that limits the opening degree of the discharge valve, and a post that contacts the retainer.

The housing includes a rear housing having a discharge chamber for containing the refrigerant discharged from the discharge port, and the rear housing may include the post.
The scroll compressor further includes an injection channel for guiding refrigerant at an intermediate pressure into the compression chamber, and an injection valve assembly for opening and closing the injection channel, the injection valve assembly may include the post.
The retainer may be deformed toward the discharge valve by the post.
The opening degree of the discharge valve when the retainer is in contact with the post may be smaller than the opening degree of the discharge valve when the retainer is not in contact with the post.
The discharge valve includes an opening/closing portion facing the discharge port, the retainer includes an opening/closing limiting portion facing the opening/closing portion, and the post may be in contact with the opening/closing limiting portion.
The post may be in contact with the central part of the opening/closing limiting section.

The housing includes a rear housing having a discharge chamber for containing the refrigerant discharged from the discharge port, and the post may extend in the direction of a virtual axis at a point where it intersects with a virtual axis that crosses the discharge port, the opening/closing section, and the opening/closing limiting section from the rear housing.
The rear housing includes an oil separation chamber for separating oil from the refrigerant, and the post may extend from the wall portion forming the oil separation chamber.
The housing includes an introduction chamber for containing refrigerant at an intermediate pressure, and comprises a valve plate that covers the introduction chamber and has an inlet communicating with the introduction chamber, an injection valve that opens and closes the inlet of the valve plate, and a cover plate that has an outlet that guides the refrigerant that has passed through the injection valve toward the compression chamber, and the post may protrude in the virtual axial direction from a portion of the cover plate that intersects with a virtual axis that crosses the discharge port, the opening/closing portion, and the opening/closing limiting portion.

The cover plate may further include ribs that protrude toward the fixed scroll and cross the cover plate, and the posts may protrude from the ribs toward the retainer.
The ribs may be formed in multiple locations, and the multiple ribs may be formed to intersect each other, and the post may protrude from the portion where the multiple ribs intersect each other.
The post may be formed to make line contact with the opening/closing limiting portion.
The line end face of the post may be formed perpendicular to a virtual axis that crosses the discharge port, the opening/closing section, and the opening/closing limiting section.

The discharge port includes a main discharge port formed on the central side of the fixed scroll and a sub-discharge port formed radially outward of the fixed scroll with respect to the main discharge port; the discharge valve includes a main opening/closing section for opening and closing the main discharge port and a sub-opening/closing section for opening and closing the sub-discharge port; the retainer includes a main opening/closing limiting section that limits the opening degree of the main opening/closing section and a sub-opening/closing limiting section that limits the opening degree of the sub-opening/closing section; and the post may be formed to contact the main opening/closing limiting section.

According to the present invention, by including a scroll compressor, a housing, a motor provided inside the housing, a rotating shaft rotated by the motor, an orbiting scroll that orbits by the rotating shaft, a stationary scroll that forms a compression chamber together with the orbiting scroll, a discharge valve that opens and closes a discharge port formed in the stationary scroll to discharge the refrigerant in the compression chamber, a retainer that limits the opening degree of the discharge valve, and a post that contacts the retainer, noise and vibration caused by collisions between the discharge valve and the retainer can be reduced.

This is a cross-sectional view showing a conventional scroll compressor. Figure 1 is a perspective view showing the rear housing, fixed scroll, discharge valve, and retainer of a scroll compressor. This is a cross-sectional view showing an enlarged view of portion A in Figure 2. This is a perspective view showing the rear housing, fixed scroll, discharge valve, and retainer in the scroll compressor of the present invention. This is an enlarged view of section B in Figure 4. This is a cross-sectional view of Figure 4. This is an enlarged view of section C in Figure 6. This is a perspective view showing the rear housing, fixed scroll, discharge valve, retainer, and injection valve assembly in a scroll compressor according to another embodiment of the present invention. Figure 8 is a perspective view showing the injection channel in a scroll compressor. Figure 8 is an exploded perspective view. Figure 8 is a perspective view of the rear housing and injection valve assembly from the fixed scroll, discharge valve, and retainer side. This is an enlarged view of section D in Figure 8. This is a cross-sectional view taken along the line E-E in Figure 12.

In the following, the scroll compressor according to the present invention will be described in detail with reference to the attached drawings.
Figure 4 is a perspective view showing the rear housing, fixed scroll, discharge valve, and retainer in the scroll compressor of the present invention; Figure 5 is an enlarged view of part B in Figure 4; Figure 6 is a cross-sectional view of Figure 4; and Figure 7 is an enlarged view of part C in Figure 6.
On the other hand, for the sake of explanation, please refer to Figure 1 for components that are not shown in Figures 4 to 7.
As shown in the attached Figures 4 to 7 and Figure 1, the scroll compressor of the present invention may include a housing 100, a motor 200 that generates power inside the housing 100, a rotating shaft 300 that rotates by the motor 200, an orbiting scroll 400 that orbits by the rotating shaft 300, and a fixed scroll 500 that is fixed to the housing 100 and meshes with the orbiting scroll 400 to form a compression chamber.

The housing 100 may include a center housing 110, a front housing 120 fastened to the center housing 110 and forming a motor housing space in which the motor 200 is housed, and a rear housing 130 fastened to the center housing 110 on the opposite side of the front housing 120 with respect to the center housing 110 and forming a scroll housing space in which the orbiting scroll 400 and the fixed scroll 500 are housed.
The center housing 110 may include a main frame 112 that separates the motor housing space from the scroll housing space and supports the orbiting scroll 400 and the fixed scroll 500, and a center housing side plate 114 that protrudes from the outer circumference of the main frame 112 toward the front housing 120.

The main frame 112 is formed in a substantially disc shape, and a bearing hole through which one end of the rotating shaft 300 passes and a back pressure chamber that pressurizes the orbiting scroll 400 toward the fixed scroll 500 may be formed in the center of the main frame 112. Here, an eccentric bush is formed at one end of the rotating shaft 300 to convert the rotational motion of the rotating shaft 300 into the orbital motion of the orbiting scroll 400, and the back pressure chamber can provide a space in which the eccentric bush can rotate.
The front housing 120 may include a front housing rigid plate 122 that faces the main frame 112 and supports the other end of the rotating shaft 300, and a front housing side plate 124 that protrudes from the outer circumference of the front housing rigid plate 122, is fastened to the center housing side plate 114, and supports the motor 200.

The rear housing 130 may include a rear housing rigid plate 132 facing the main frame 112, and a rear housing side plate 134 that protrudes from the outer periphery of the rear housing rigid plate 132 and is fastened to the outer periphery of the main frame 112.
Furthermore, the rear housing 130 may further include a discharge chamber D for containing the refrigerant discharged from the compression chamber, an oil separation chamber V for separating oil from the refrigerant, an oil separation chamber inlet connecting the discharge chamber D and the oil separation chamber V, an oil separation chamber oil outlet for guiding the oil separated from the refrigerant in the oil separation chamber V to an oil recovery passage, and an oil separation chamber refrigerant outlet for guiding the refrigerant separated from the oil in the oil separation chamber V to the outside.
Furthermore, the rear housing 130 may further include a post 136 that protrudes from the wall portion forming the oil separation chamber V and contacts the retainer 560 described later.

Here, the post 136 may extend from any position on the inner wall surface of the rear housing 130, but in order to minimize the extension length of the post 136, minimize obstruction of the refrigerant flow by the post 136, and improve the support force on the retainer 560 described later, it is preferable, as in this embodiment, to extend in the axial direction (vertical direction in Figures 4 and 6) from the wall portion that forms the oil separation chamber V facing the retainer 560 described later.
Furthermore, it is preferable that the post 136 extends in a virtual axial direction from a portion of the wall forming the oil separation chamber V that intersects with a virtual axis that crosses the main discharge port 542, the main opening/closing portion 552, and the main opening/closing portion 562, as described later, so as to contact the main opening/closing limiting portion 562 of the retainer 560, as described later.

Furthermore, it is preferable that the post 136 is formed to contact the central part of the main opening/closing limiting section 562, which will be described later.
Furthermore, it is preferable that the post 136 is formed such that its linear end face 136b is perpendicular to a virtual axis, and that the corner between the linear end face 136b and the outer circumferential surface 136a of the post 136 is formed to be in line contact with the retainer 560, which will be described later.
Furthermore, it is preferable that the post 136 not only simply contacts the retainer 560 described later, but is also formed to deform when the retainer 560 is pressurized towards the discharge valve 550 described later.
The motor 200 may include a stator 210 fixed to the front housing side plate 124 and a rotor 220 that rotates inside the stator 210 through interaction with the stator 210.

The rotating shaft 300 may be fastened to the rotor 220, pass through the center of the rotor 220, have one end passing through a bearing hole in the main frame 112, and have the other end supported by the front housing hard plate 122.
The orbital scroll 400 is interposed between the main frame 112 and the fixed scroll 500 and may include a disc-shaped orbital scroll rigid plate 410, an orbital scroll wrap 420 projecting from the center of the orbital scroll rigid plate 410 toward the fixed scroll 500, and an orbital scroll boss 430 projecting from the center of the orbital scroll rigid plate 410 toward the opposite side of the orbital scroll wrap 420 and fastened to an eccentric bush.

The fixed scroll 500 may include a disc-shaped fixed scroll rigid plate 510, a fixed scroll lap 520 that protrudes from the center of the fixed scroll rigid plate 510 and meshes with the orbiting scroll lap 420, and a fixed scroll side plate 530 that protrudes from the outer circumference of the fixed scroll rigid plate 510, is fastened to the main frame 112, and forms the orbiting space of the orbiting scroll 400.
Here, the fixed scroll rigid plate 510 includes a discharge port 540 for discharging the refrigerant from the compression chamber to the discharge chamber D, and a discharge valve 550 for opening and closing the discharge port 540 and a retainer 560 for limiting the opening degree of the discharge valve 550 can be fixed to the fixed scroll rigid plate 510 by fastening bolts.
Furthermore, the discharge port 540 may be formed in multiple locations to prevent the refrigerant from being excessively compressed, and the discharge valve 550 and retainer 560 may be formed to correspond to the multiple discharge ports 540.

Specifically, the compression chamber includes a first compression chamber located radially centrifugal to the scroll housing space where the refrigerant pressure is a first pressure, a second compression chamber located radially centrifugal to the scroll housing space further than the first compression chamber where the refrigerant pressure is a second pressure higher than the first pressure, and a third compression chamber located radially centrifugal to the scroll housing space further than the second compression chamber where the refrigerant pressure is a third pressure higher than the second pressure. The first, second, and third compression chambers may each be provided in pairs.
In other words, the first compression chamber may include a first outer compression chamber formed by the outer circumferential surface of the orbiting scroll wrap 420 and the inner circumferential surface of the fixed scroll wrap 520, and a first inner compression chamber formed by the inner circumferential surface of the orbiting scroll wrap 420 and the outer circumferential surface of the fixed scroll wrap 520.

Furthermore, the second compression chamber may include a second outer compression chamber formed by the outer circumferential surface of the orbiting scroll wrap 420 and the inner circumferential surface of the fixed scroll wrap 520, and a second inner compression chamber formed by the inner circumferential surface of the orbiting scroll wrap 420 and the outer circumferential surface of the fixed scroll wrap 520.
The third compression chamber may include a third outer compression chamber formed by the outer circumferential surface of the orbiting scroll wrap 420 and the inner circumferential surface of the fixed scroll wrap 520, and a third inner compression chamber formed by the inner circumferential surface of the orbiting scroll wrap 420 and the outer circumferential surface of the fixed scroll wrap 520.

In this case, the discharge port 540 may include a main discharge port 542 formed on the central side of the fixed scroll rigid plate 510 for discharging the refrigerant from the third outer compression chamber and the third inner compression chamber, a first sub-discharge port 542 formed radially outward of the fixed scroll rigid plate 510 relative to the main discharge port 542 for discharging the refrigerant from the second outer compression chamber, and a second sub-discharge port formed radially outward of the fixed scroll rigid plate 510 relative to the main discharge port 542 and opposite the first sub-discharge port relative to the main discharge port 542 for discharging the refrigerant from the second inner compression chamber.

Furthermore, the discharge valve 550 may include a fastening portion 551 fastened to the fixed scroll hard plate 510, a main opening/closing portion 552 for opening and closing the main discharge port 542, a first sub-opening/closing portion 554 for opening and closing the first sub-discharge port, a second sub-opening/closing portion 556 for opening and closing the second sub-discharge port, a main lead portion 553 extending from the fastening portion 551 to the main opening/closing portion 552, a first sub-lead portion 555 extending from the fastening portion 551 to the first sub-opening/closing portion 554, and a second sub-lead portion extending from the fastening portion 551 to the second sub-opening/closing portion 556.

The retainer 560 includes a fixing portion 561 that is fastened to the fixed scroll hard plate 510 together with the fastening portion 551 of the discharge valve 550, a main opening/closing limiting portion 562 that faces the main opening/closing portion 552 of the discharge valve 550 and limits the amount of opening and closing of the main opening/closing portion 552, a first sub opening/closing limiting portion 564 that faces the first sub opening/closing portion 554 of the discharge valve 550 and limits the opening degree of the first sub opening/closing portion 554, and a second sub opening/closing limiting portion that faces the second sub opening/closing portion 556 of the discharge valve 550. The device may include a second sub-opening/closing limiting section 566 that limits the opening degree of the closing section 556, a main lead limiting section 563 extending from the fixed section 561 to the main opening/closing limiting section 562 and facing the main lead section 553, a first sub-lead limiting section 565 extending from the fixed section 561 to the first sub-opening/closing limiting section 564 and facing the first sub-lead section 555, and a second sub-lead limiting section 567 extending from the fixed section 561 to the second sub-opening/closing limiting section 566 and facing the second sub-lead section.

The following describes the effects and benefits of the scroll compressor according to this embodiment.
In other words, when power is applied to the motor 200, the rotating shaft 300 can rotate together with the rotor 220. Also, the orbiting scroll 400 can orbit by receiving rotational force from the rotating shaft 300 through the eccentric bush. As a result, the compression chamber can continuously move toward the center while reducing its volume. Furthermore, the refrigerant flows into the compression chamber and is compressed as it moves toward the center along the movement path of the compression chamber. The refrigerant compressed in the compression chamber can then be discharged into the discharge chamber D through the discharge port 540, which is opened by the discharge valve 550.

Here, when the pressure in the third outer compression chamber and the third inner compression chamber reaches the discharge pressure level, the main opening/closing unit 552 opens the main discharge port 542. When the pressure in the second outer compression chamber exceeds the second pressure, the first sub-opening/closing unit 554 opens the first sub-discharge port to lower the pressure in the second outer compression chamber to the second pressure level. When the pressure in the second inner compression chamber exceeds the second pressure, the second sub-opening/closing unit 556 opens the second sub-discharge port to lower the pressure in the second inner compression chamber to the second pressure level. This prevents the pressure of the refrigerant discharged from the main discharge port 542 from becoming excessively high above the discharge pressure. In other words, over-compression can be prevented.

Alternatively, the refrigerant in discharge chamber D may move to oil separation chamber V through the inlet of oil separation chamber. The refrigerant flowing into oil separation chamber V will undergo cyclone motion, and the oil contained in the refrigerant will be adsorbed onto the inner wall surface of oil separation chamber V and separated from the refrigerant.
The oil separated from the refrigerant in the oil separation chamber V can move to the oil recovery channel through the oil outlet of the oil separation chamber.
Furthermore, the refrigerant separated from the oil in the oil separation chamber V can be discharged to the outside of the housing 100 through the refrigerant outlet of the oil separation chamber.

In this embodiment, the scroll compressor includes a post 136 in which the rear housing 130 contacts the retainer 560, thereby reducing noise and vibration caused by collisions between the discharge valve 550 and the retainer 560.
Specifically, the contact of the post 136 with the retainer 560 increases the mass and strength of the object that collides with the discharge valve 550, thereby reducing noise and vibration caused by the collision.

Furthermore, instead of simply having the post 136 contact the retainer 560, the opening degree of the discharge valve 550 can be reduced by pressurizing and deforming the retainer 560 towards the discharge valve 550. That is, the opening degree of the discharge valve 550 when the retainer 560 is pressurized and deformed by the post 136 may be smaller than the opening degree of the discharge valve 550 when the retainer 560 is not pressurized and undeformed by the post 136. This reduces the range of motion of the discharge valve 550, decreases the impact the discharge valve 550 exerts on the retainer 560, and as a result, further reduces noise and vibration caused by collisions between the discharge valve 550 and the retainer 560.

However, if the opening of the discharge valve 550 is excessively reduced, it may adversely affect the flow rate of the refrigerant discharged through the discharge port 540. Therefore, the amount of deformation of the retainer 560 due to the post 136 must be appropriately controlled. That is, the protruding length of the post 136 must be controlled to fall within a predetermined range. For this purpose, in this embodiment, the line end face of the rear housing side plate 134, whose tolerance is controlled for contact with the sealing member interposed between the rear housing 130 and the center housing 110, can be used as a reference plane. The axial distance (vertical direction in Figures 4 and 6) between the reference plane and the line end face 136b of the post 136 can be controlled to fall within a predetermined range.

On the other hand, unlike this embodiment, if the post 136 and the retainer 560 are formed to make surface contact with each other, the linear end face 136b of the post 136 must be formed to correspond to the curved shape of the retainer 560. This is extremely difficult and complex, and increases costs. However, as in this embodiment, if the post 136 is formed such that its linear end face 136b is perpendicular to the direction of extension of the post 136, and the post 136 makes line contact with the retainer 560, the cost of forming the linear end face 136b of the post 136 can be reduced.

While line contact between post 136 and retainer 560 may weaken the noise and vibration reduction effect caused by collision between the discharge valve 550 and retainer 560, as in this embodiment, contact between post 136 and the opening/closing limiting portion of the retainer 560, particularly the central part of the opening/closing limiting portion, allows for sufficient noise and vibration reduction even with a small contact area between post 136 and retainer 560. Specifically, the opening/closing portion of the discharge valve 550 has the largest range of motion, and consequently, the opening/closing limiting portion of the retainer 560 receives the greatest impact. By contacting this portion of the retainer 560, post 136 effectively reduces noise and vibration. Furthermore, contact between post 136 and the central part of the opening/closing limiting portion ensures even and stable support of the entire portion, resulting in greater noise and vibration reduction than when the outer periphery of the opening/closing limiting portion is supported by post 136.

On the other hand, as described above, since the retainer 560 includes a main opening/closing limiting section 562, a first sub-opening/closing limiting section 564, and a second sub-opening/closing limiting section 566, the post 136 may be formed to contact all of the main opening/closing limiting section 562, the first sub-opening/closing limiting section 564, and the second sub-opening/closing limiting section 566. However, in this case, the cost, weight, and resistance to the flow of refrigerant may increase. Taking this into consideration, in this embodiment, the post 136 is formed to support the main opening/closing limiting section 562, which receives the most impacts and a relatively large impact amount among the main opening/closing limiting section 562, the first sub-opening/closing limiting section 564, and the second sub-opening/closing limiting section 566. This suppresses the increase in cost, weight, and resistance to the flow of refrigerant, and effectively reduces noise and vibration.
On the other hand, in this embodiment, the post P is formed in the rear housing 130, but the invention is not limited to this.

Figure 8 is a perspective view showing the rear housing, fixed scroll, discharge valve, retainer, and injection valve assembly in a scroll compressor according to another embodiment of the present invention; Figure 9 is a perspective view showing the injection flow path in the scroll compressor of Figure 8; Figure 10 is an exploded perspective view of Figure 8; Figure 11 is a perspective view of the rear housing and injection valve assembly of Figure 8 as seen from the fixed scroll, discharge valve, and retainer side; Figure 12 is an enlarged view of portion D in Figure 8; and Figure 13 is a cross-sectional view taken along line E-E in Figure 12.

Referring to the attached Figures 1 and 8 to 13, another embodiment of the present invention may include a scroll compressor comprising a housing 100, a motor 200 that generates power inside the housing 100, a rotating shaft 300 that rotates by the motor 200, an orbiting scroll 400 that orbits by the rotating shaft 300, and a fixed scroll 500 that is fixed to the housing 100 and meshes with the orbiting scroll 400 to form a compression chamber.
Furthermore, the scroll compressor may further include, for example, an injection channel that guides refrigerant at an intermediate pressure from downstream of a condenser located outside the housing 100 into the compression chamber, and an injection valve assembly 800 that opens and closes the injection channel.

Here, the injection channel includes the introduction port 132b, introduction chamber Ci, inlet 812, chamber 832, outlet 834, and injection port 570, as described later, and extends from the rear housing 130 to the fixed scroll 500. The injection valve assembly 800 includes the inlet 812, chamber 832, and outlet 834, as described later, and may be interposed between the rear housing 130 and the fixed scroll 500. The housing 100 may include a center housing 110, a front housing 120 fastened to the center housing 110 and forming a motor housing space in which the motor 200 is housed, and a rear housing 130 fastened to the center housing 110 on the opposite side of the front housing 120 with respect to the center housing 110, and forming a scroll housing space in which the orbiting scroll 400 and the fixed scroll 500 are housed.

The center housing 110 may include a main frame 112 that separates the motor housing space from the scroll housing space and supports the orbiting scroll 400 and the fixed scroll 500, and a center housing side plate 114 that protrudes from the outer circumference of the main frame 112 toward the front housing 120.
The main frame 112 is formed in a substantially disc shape, and a bearing hole through which one end of the rotating shaft 300 passes, and a back pressure chamber that pressurizes the orbiting scroll 400 toward the fixed scroll 500 can be formed in the center of the main frame 112. Here, an eccentric bush is formed at one end of the rotating shaft 300 to convert the rotational motion of the rotating shaft 300 into the orbital motion of the orbiting scroll 400, and the back pressure chamber can provide a space in which the eccentric bush can rotate.
Furthermore, as will be described later, an intake passage may be formed on the outer periphery of the main frame 112 to guide the refrigerant flowing into the motor housing space into the scroll housing space.

The front housing 120 may include a front housing rigid plate 122 that faces the main frame 112 and supports the other end of the rotating shaft 300, and a front housing side plate 124 that protrudes from the outer circumference of the front housing rigid plate 122, is fastened to the center housing side plate 114, and supports the motor 200.
Furthermore, the front side plate 124 may have an intake port formed therein to guide the refrigerant under external suction pressure into the motor housing space.
The rear housing 130 may include a rear housing rigid plate 132 facing the main frame 112, and a rear housing side plate 134 that protrudes from the outer periphery of the rear housing rigid plate 132 and is fastened to the outer periphery of the main frame 112.

Furthermore, the rear housing 130 may further include a discharge chamber Cd for containing the refrigerant discharged from the compression chamber, a discharge port 132a for guiding the refrigerant from the discharge chamber Cd to the outside of the housing, an introduction port 132b for introducing refrigerant at an intermediate pressure from outside the housing 100, and an introduction chamber Ci for containing the refrigerant introduced through the introduction port 132b.
Here, the rear housing 130 may include a first annular wall 136 that protrudes from the rear housing rigid plate 132 and is located radially inward of the rear housing side plate 134, and a second annular wall 138 that protrudes from the rear housing rigid plate 132 and is located radially inward of the first annular wall 136.

The rear housing side plate 134 may be formed in an annular shape having a diameter approximately equal to the outer circumference of the main frame 112, and may be fastened to the outer circumference of the main frame 112 to form a scroll housing space.
The first annular wall 136 may be formed in an annular shape having a smaller diameter than the rear housing side plate 134, and may contact the outer circumference of the fixed scroll hard plate 510 (described later) to form a discharge chamber Cd.
The second annular wall (138) is formed in an annular shape having a smaller diameter than the first annular wall 136, is separated from the fixed scroll hard plate 510 described later, is covered by the valve plate 810 described later, and can form an introduction chamber Ci.

A discharge port 132a is formed in the rear housing hard plate 132, and the discharge port 132a extends radially from the center of the rear housing hard plate 132 to one side of the outer periphery of the rear housing hard plate 132, and can communicate with the discharge chamber Cd.
Furthermore, an introduction port 132b is also formed in the rear housing hard plate 132. The introduction port 132b extends radially from the outer periphery of the rear housing hard plate 132 to the center of the rear housing hard plate 132 and can communicate with the introduction chamber Ci.

The motor 200 may include a stator 210 fixed to the front housing side plate 124 and a rotor 220 that rotates inside the stator 210 through interaction with the stator 210.
The rotating shaft 300 may be fastened to the rotor 220, with one end of the rotating shaft 300 passing through the center of the rotor 220 and through a bearing hole in the main frame 112, and the other end of the rotating shaft 300 being supported by the front housing hard plate 122.
The orbital scroll 400 is interposed between the main frame 112 and the fixed scroll 500 and may include a disc-shaped orbital scroll rigid plate 410, an orbital scroll wrap 420 projecting from the center of the orbital scroll rigid plate 410 toward the fixed scroll 500, and an orbital scroll boss 430 projecting from the center of the orbital scroll rigid plate 410 toward the opposite side of the orbital scroll wrap 420 and fastened to an eccentric bush.

The fixed scroll 500 may include a disc-shaped fixed scroll rigid plate 510, a fixed scroll lap 520 that protrudes from the center of the fixed scroll rigid plate 510 and meshes with the orbiting scroll lap 420, and a fixed scroll side plate 530 that protrudes from the outer circumference of the fixed scroll rigid plate 510, is fastened to the main frame 112, and forms the orbiting space of the orbiting scroll 400.
Here, the fixed scroll rigid plate 510 includes a discharge port 540 for discharging the refrigerant from the compression chamber to the discharge chamber Cd, and a discharge valve 550 interposed between the fixed scroll rigid plate 510 and the injection valve assembly 800 for opening and closing the discharge port 540, and a retainer 560 for limiting the opening degree of the discharge valve 550 may be fixed to the fixed scroll rigid plate 510 by fastening bolts.

Furthermore, multiple discharge ports 540 may be formed to prevent the refrigerant from being excessively compressed, and the discharge valve 550 and retainer 560 may be formed to accommodate multiple discharge ports 540.
Specifically, the compression chamber includes a first compression chamber located radially centrifugal to the scroll housing space, where the refrigerant pressure is a first pressure; a second compression chamber located radially centrifugal to the scroll housing space from the first compression chamber, where the refrigerant pressure is a second pressure higher than the first pressure; and a third compression chamber located radially centrifugal to the scroll housing space from the second compression chamber, where the refrigerant pressure is a third pressure higher than the second pressure. The first, second, and third compression chambers may each be provided in pairs.
In other words, the first compression chamber may include a first outer compression chamber formed by the outer circumferential surface of the orbiting scroll wrap 420 and the inner circumferential surface of the fixed scroll wrap 520, and a first inner compression chamber formed by the inner circumferential surface of the orbiting scroll wrap 420 and the outer circumferential surface of the fixed scroll wrap 520.

Furthermore, the second compression chamber may include a second outer compression chamber formed by the outer circumferential surface of the orbiting scroll wrap 420 and the inner circumferential surface of the fixed scroll wrap 520, and a second inner compression chamber formed by the inner circumferential surface of the orbiting scroll wrap 420 and the outer circumferential surface of the fixed scroll wrap 520.
The third compression chamber may include a third outer compression chamber formed by the outer circumferential surface of the orbiting scroll wrap 420 and the inner circumferential surface of the fixed scroll wrap 520, and a third inner compression chamber formed by the inner circumferential surface of the orbiting scroll wrap 420 and the outer circumferential surface of the fixed scroll wrap 520.

In this case, the discharge port 540 may include a main discharge port 542 formed on the central side of the fixed scroll rigid plate 510 to discharge the refrigerant from the third outer compression chamber and the third inner compression chamber, a first sub-discharge port 542 formed radially outward of the fixed scroll rigid plate 510 relative to the main discharge port 542 to discharge the refrigerant from the second outer compression chamber, and a second sub-discharge port formed radially outward of the fixed scroll rigid plate 510 relative to the main discharge port 542, but on the opposite side of the first sub-discharge port relative to the main discharge port 542 to discharge the refrigerant from the second inner compression chamber.

Furthermore, the discharge valve 550 may include a fastening portion 551 fastened to the fixed scroll hard plate 510, a main opening/closing portion 552 for opening and closing the main discharge port 542, a first sub-opening/closing portion 554 for opening and closing the first sub-discharge port, a second sub-opening/closing portion 556 for opening and closing the second sub-discharge port, a main lead portion 553 extending from the fastening portion 551 to the main opening/closing portion 552, a first sub-lead portion extending from the fastening portion 551 to the first sub-opening/closing portion 554, and a second sub-lead portion extending from the fastening portion 551 to the second sub-opening/closing portion 556.

The retainer 560 includes a fixing portion 561 fastened to the fixed scroll hard plate 510 together with the fastening portion 551 of the discharge valve 550, a main opening/closing limiting portion 562 that faces the main opening/closing portion 552 of the discharge valve 550 and limits the opening degree of the main opening/closing portion 552, a first sub-opening/closing limiting portion 564 that faces the first sub-opening/closing portion 554 of the discharge valve 550 and limits the opening degree of the first sub-opening/closing portion 554, and a second sub-opening/closing limiting portion 564 that faces the second sub-opening/closing portion 556 of the discharge valve 550. The device may include a second sub-opening/closing limiting section 566 that limits the opening degree of the second sub-opening/closing section 556, a main lead limiting section 563 extending from the fixed section 561 to the main open/closing limiting section 562 and facing the main lead section 553, a first sub-lead limiting section extending from the fixed section 561 to the first sub-opening/closing limiting section 564 and facing the first sub-lead section, and a second sub-lead limiting section extending from the fixed section 561 to the second sub-opening/closing limiting section 566 and facing the second sub-lead section.

On the other hand, the fixed scroll rigid plate 510 further includes an inlet 570 for guiding the refrigerant discharged from the injection valve assembly 800 into the compression chamber, and the inlet 570 may be formed to supply the refrigerant discharged from the injection valve assembly 800 to both of the pair of first compression chambers. That is, the inlet 570 may include a first inlet that can communicate with the first outer compression chamber and a second inlet that can communicate with the first inner compression chamber.
The injection valve assembly 800 may include an inlet 812 communicating with the introduction chamber Ci, a valve plate 810 covering the introduction chamber Ci, an injection valve 820 opening and closing the inlet 812 of the valve plate 810, a chamber 832 for temporarily containing the refrigerant that has passed through the injection valve 820, and a cover plate 830 having an outlet 834 that guides the refrigerant to the inlet 570.

Here, the cover plate 830 may include a lower cover plate surface 836 facing the fixed scroll 500.
Furthermore, the lower surface 836 of the cover plate may be formed to be separated from the fixed scroll rigid plate 510 so that the discharge valve 550 and retainer 560 are interposed between the fixed scroll rigid plate 510 and the lower surface of the valve plate 810, and so that the refrigerant discharged from the discharge port 540 can flow into the discharge chamber Cd.
Furthermore, the cover plate 830 may further include ribs 838 that project from the lower surface 836 of the cover plate toward the fixed scroll 500 and traverse the cover plate 830 in the diametrical direction in order to reinforce the strength of the cover plate 830.

Furthermore, the cover plate 830 may further include a post P that contacts the retainer 560.
Here, in order to reduce the protruding length of post P, reduce obstruction of the refrigerant flow by post P, and improve the support force on retainer 560, it is preferable that post P protrudes from the cover plate 830 facing retainer 560 in the axial direction (up and down direction in Figure 8), as in this embodiment.
Furthermore, it is preferable that the post P protrudes in a virtual axial direction from a portion of the cover plate 830 that intersects with a virtual axis that crosses the main discharge port 542, the main opening/closing portion 552, and the main opening/closing limiting portion 562, so as to contact the main opening/closing limiting portion 562 of the retainer 560.

Furthermore, to further shorten the protruding length of post P and further improve the strength of cover plate 830, it is preferable that a portion of rib 838 is formed to intersect with a virtual axis, and that post P protrudes in the virtual axial direction from the portion of rib 838 that intersects with the virtual axis.
Furthermore, it is even more preferable, from the standpoint of improving strength, that multiple ribs 838 are formed, that the multiple ribs 838 intersect with each other, and that the post P protrudes from the portion where the multiple ribs 838 intersect with each other.
Furthermore, it is preferable that the post P is formed to contact the central part of the main opening/closing limiting section 562.
Furthermore, it is preferable that the post P is formed such that its linear end face P2 is perpendicular to a virtual axis, and that the corner between the linear end face P2 and the outer circumferential surface P1 of the post P is in line contact with the retainer 560.
Furthermore, it is preferable that post P not only contacts retainer 560, but is also formed to deform when pressurized toward discharge valve 550.

The following describes the effects and benefits of the scroll compressor according to this embodiment.
In other words, when power is applied to the motor 200, the rotating shaft 300 can rotate together with the rotor 220. Also, the orbiting scroll 400 can orbit as rotational force is transmitted from the rotating shaft 300 through the eccentric bush. As a result, the compression chamber can decrease in volume while continuously moving toward the center. The refrigerant at suction pressure flows into the compression chamber through the suction port, motor housing space, suction passage, and scroll housing space. The refrigerant drawn into the compression chamber is compressed as it moves toward the center along the movement path of the compression chamber. The refrigerant compressed in the compression chamber is then discharged into the discharge chamber Cd through the discharge port 540 opened by the discharge valve 550.

Here, as shown by the dotted arrow in Figure 9, by injecting refrigerant at an intermediate pressure into the compression chamber through the injection channel, it is possible to compress and discharge not only refrigerant at the suction pressure but also refrigerant at an intermediate pressure. As a result, the amount of refrigerant discharged increases compared to when only refrigerant at the suction pressure is drawn in, compressed, and discharged, thereby improving the performance and efficiency of the scroll compressor.
Furthermore, when the pressure in the third outer compression chamber and the third inner compression chamber reaches the discharge pressure level, the main opening/closing unit 552 opens the main discharge port 542. When the pressure in the second outer compression chamber exceeds the second pressure, the first sub opening/closing unit 554 opens the first sub discharge port to lower the pressure in the second outer compression chamber to the second pressure level. When the pressure in the second inner compression chamber exceeds the second pressure, the second sub opening/closing unit 556 opens the second sub discharge port to lower the pressure in the second inner compression chamber to the second pressure level. This prevents the pressure of the refrigerant discharged from the main discharge port 542 from becoming excessively high above the discharge pressure. In other words, overcompression can be prevented.

Alternatively, the refrigerant in the discharge chamber Cd may be discharged to the outside of the housing 100 through the discharge port 132a.
In this embodiment, the scroll compressor includes a post P in which the injection valve assembly 800 contacts the retainer 560, thereby reducing noise and vibration caused by collisions between the discharge valve 550 and the retainer 56. However, a detailed explanation of this is omitted as it would be redundant with the above-described embodiment.

100 Housing 110 Center housing 112 Main frame 114 Center housing side plate 120 Front housing 122 Front housing hard plate 124 Front housing side plate 130 Rear housing 132 Rear housing hard plate 132a Discharge port 132b Inlet port 134 Rear housing side plate 136 Post, first annular wall 136a Outer peripheral surface 136b Line end surface 138 Second annular wall 143 Rear housing side plate 200 Motor 210 Stator 220 Rotor 300 Rotating shaft 400 Orbital scroll 410 Orbital scroll hard plate 420 Orbital scroll wrap 430 Orbital scroll boss 500 Fixed scroll 510 Fixed scroll hard plate 520 Fixed scroll wrap 530 Fixed scroll side plate 540 Discharge port 542 Main discharge port, first sub discharge port 550 Discharge valve 551 Fastening part 552 Main opening/closing section 553 Main lead section 554 First sub opening/closing section 555 First sub lead section 556 Second sub opening/closing section 560 Retainer 561 Fixing section 562 Main opening/closing limiting section 563 Main lead limiting section 564 First sub opening/closing limiting section 565 First sub lead limiting section 566 Second sub opening/closing limiting section 567 Sub lead limiting section 570 Inlet 800 Open injection valve assembly 810 Valve plate 812 Inlet 820 Injection valve 830 Cover plate 832 Chamber 834 Outlet 836 Cover plate bottom surface 838 Rib Ci Inlet chamber Cd Discharge chamber D Discharge chamber P Post P1 Outer peripheral surface P2 Wire end surface V Oil separation chamber

Claims (13)

Housing and
A motor provided inside the housing,
A rotating shaft that is rotated by the aforementioned motor,
A revolving scroll that rotates on the aforementioned axis,
A fixed scroll that forms a compression chamber together with the orbiting scroll,
A discharge valve that opens and closes a discharge port formed in the fixed scroll in order to discharge the refrigerant from the compression chamber,
A retainer that limits the opening degree of the discharge valve,
Includes a post that contacts the aforementioned retainer,
The discharge port includes a main discharge port formed on the central side of the fixed scroll and a sub-discharge port formed radially outward of the fixed scroll with respect to the main discharge port.
The discharge valve includes a main opening/closing unit for opening and closing the main discharge port, and a sub-opening/closing unit for opening and closing the sub-discharge port.
The retainer includes a main opening/closing limiting section that limits the opening degree of the main opening/closing section, and a sub-opening/closing limiting section that limits the opening degree of the sub-opening/closing section.
A scroll compressor characterized in that the post is in contact with the central part of the main opening/closing limiting section and is formed to be separated from the part of the retainer other than the central part of the main opening/closing limiting section . The housing includes a rear housing having a discharge chamber for containing the refrigerant discharged from the discharge port,
The scroll compressor according to claim 1, characterized in that the rear housing includes the post. The invention further includes an injection channel for guiding refrigerant at an intermediate pressure into the compression chamber, and an injection valve assembly for opening and closing the injection channel.
The scroll compressor according to claim 1, characterized in that the injection valve assembly includes the post. The scroll compressor according to claim 1, characterized in that the retainer is deformed toward the discharge valve side by the post. The scroll compressor according to claim 4, characterized in that the opening degree of the discharge valve when the retainer is in contact with the post is smaller than the opening degree of the discharge valve when the retainer is not in contact with the post. The housing includes a rear housing having a discharge chamber for containing the refrigerant discharged from the main discharge port and the sub-discharge port .
The scroll compressor according to claim 1 , characterized in that the post extends in the direction of the virtual axis from a portion that intersects with a virtual axis that crosses the main discharge port, the main opening /closing section, and the main opening /closing limiting section in the rear housing. The rear housing includes an oil separation chamber for separating oil from the refrigerant.
The scroll compressor according to claim 6 , characterized in that the post extends from the wall portion forming the oil separation chamber. The housing includes an introduction chamber for containing a refrigerant at an intermediate pressure,
A valve plate is provided which has an inlet that communicates with the introduction chamber and covers the introduction chamber, an injection valve that opens and closes the inlet of the valve plate, and a cover plate which has an outlet that guides the refrigerant that has passed through the injection valve to the compression chamber side.
The scroll compressor according to claim 1 , characterized in that the post protrudes in the direction of the virtual axis from a portion of the cover plate that intersects with a virtual axis that crosses the main discharge port, the main opening /closing section, and the main opening/closing limiting section. The cover plate further includes ribs that protrude toward the fixed scroll and cross the cover plate,
The scroll compressor according to claim 8 , characterized in that the post protrudes from the rib toward the retainer. The scroll compressor according to claim 9 , characterized in that a plurality of ribs are formed, the plurality of ribs are formed to intersect each other, and the post protrudes from the portion where the plurality of ribs intersect each other. The scroll compressor according to claim 1 , characterized in that the post is formed to be in line contact with the main opening /closing limiting section. The scroll compressor according to claim 11, characterized in that the line end face of the post is formed to be perpendicular to a virtual axis that crosses the main discharge port, the main opening /closing section, and the main opening /closing limiting section. Housing and
A motor provided inside the housing,
A rotating shaft that is rotated by the aforementioned motor,
A revolving scroll that rotates on the aforementioned axis,
A fixed scroll that forms a compression chamber together with the orbiting scroll,
A discharge valve that opens and closes a discharge port formed in the fixed scroll in order to discharge the refrigerant from the compression chamber,
A retainer that limits the opening degree of the discharge valve,
A post that contacts the retainer,
An injection channel for guiding refrigerant at an intermediate pressure into the compression chamber,
Includes an injection valve assembly that opens and closes the injection channel,
The housing includes an introduction chamber for containing a refrigerant at an intermediate pressure,
The injection valve assembly includes a valve plate having an inlet that communicates with the introduction chamber and covering the introduction chamber, an injection valve that opens and closes the inlet of the valve plate, and a cover plate having an outlet that guides the refrigerant that has passed through the injection valve towards the compression chamber.
The cover plate further includes ribs that protrude toward the fixed scroll and cross the cover plate,
The scroll compressor is characterized in that the post protrudes from the rib toward the retainer.