KR102214840B1 - Compressor and scroll compressor - Google Patents

Abstract

The present specification relates to a scroll compressor.
A scroll compressor according to an aspect includes a casing provided with a rotating shaft; A discharge cover fixed inside the casing and partitioning the inside of the casing into a suction space and a discharge space; A first scroll performing a orbiting motion by rotation of the rotation shaft; A second scroll forming a plurality of compression chambers together with the first scroll and having a hole capable of communicating with at least one of the plurality of compression chambers; A valve fastened to the second scroll to open and close the hole; And a fastening member for fastening the valve to the second scroll, wherein the second scroll includes a fastening groove to which the fastening member can be fastened and has a screw thread or unevenness on an inner circumferential surface, and the fastening member is a rivet And, in a process in which the fastening member penetrates the valve and is fastened to the fastening groove, the fastening member engages with threads or irregularities formed on the inner circumferential surface of the fastening groove.

Description

Compressor and scroll compressor

The present specification relates to a compressor and a scroll compressor.

A scroll compressor is a compressor using a fixed scroll having a helical wrap and an orbiting scroll that orbits about the fixed scroll, and the volume of the compression chamber formed between the fixed scroll and the orbiting scroll rotates according to the orbiting motion of the orbiting scroll. It is a compressor of a type in which fluid is discharged from a discharge port formed in the center of the fixed scroll by increasing the pressure of the fluid accordingly.

In such a scroll compressor, suction, compression, and discharge are continuously performed while the orbiting scroll rotates, and thus, in principle, a discharge valve and a suction valve are not required. In addition, the scroll compressor has a simple structure due to a small number of parts, and has a feature that the orbiting scroll can rotate at high speed. In addition, the scroll compressor has the advantage of small fluctuations in torque required for compression, and low noise and vibration since suction and compression are continuously performed.

Korean Patent Publication No. 10-2006-0039828 (published on May 9, 2006) (hereinafter referred to as "priority literature") discloses a scroll compressor.

The scroll compressor includes a fixed scroll, a revolving scroll, and a check valve assembly provided above the fixed scroll and opening and closing a discharge port formed in the fixed scroll.

However, in the case of the scroll compressor of the prior literature, since the check valve assembly is coupled to the fixed scroll by a screw, a problem in which the screw is loosened due to vibration generated during operation of the scroll compressor may occur. If the length of the screw is increased in order to prevent the screw from being loosened, the depth of the groove in which the screw is fastened must be made deeper in the fixed scroll, thus increasing the height of the fixed scroll.

In addition, when the check valve assembly is fastened to the fixed scroll using a screw, the head of the screw is thick, so when an additional member is fastened to the upper side of the fixed scroll, an avoidance space for preventing interference with the head from the member is provided. There is a problem that must be largely formed.

In addition, in the case of the scroll compressor of the prior literature, the valve body itself is configured to open and close the discharge port by elastic deformation. In this case, when a high pressure is applied to the valve body and the valve body is excessively deformed, the valve body cannot return to its original shape, and thus the function of blocking the discharge port may be degraded.

It is an object of the present invention to provide a compressor and a scroll compressor in which a configuration for coupling a valve for opening and closing a hole through which a refrigerant flows is simplified and a coupling force is improved.

A scroll compressor according to an aspect includes a casing provided with a rotating shaft; A discharge cover fixed inside the casing and partitioning the inside of the casing into a suction space and a discharge space; A first scroll performing a orbiting motion by rotation of the rotation shaft; A second scroll forming a plurality of compression chambers together with the first scroll and having a hole capable of communicating with at least one of the plurality of compression chambers; A valve fastened to the second scroll to open and close the hole; And a fastening member for fastening the valve to the second scroll, wherein the second scroll includes a fastening groove to which the fastening member can be fastened and has a screw thread or unevenness on an inner circumferential surface thereof, and the fastening member includes the A fastening body which passes through a valve and is fastened to the fastening groove, the fastening member is a rivet, and the rivet is inserted into the fastening groove; A head formed on the upper side of the fastening body; And a separating part detachable from the fastening body, wherein the outer circumferential surface of the fastening body is deformed by a screw thread or unevenness formed on the inner circumferential surface of the fastening groove while the separating part is separated from the fastening body. All.

In addition, the valve further includes a stopper for limiting a moving distance of the valve when the hole is opened, and the fastening member fastens the stopper and the valve to the second scroll, the stopper and the valve Each includes a fastening hole.

In addition, the stopper includes a protrusion passing through the valve so that the stopper and the fastening hole of each of the valves are aligned, and the valve includes a protrusion through hole through which the protrusion passes, and the second scroll includes the And a protrusion receiving groove in which the protrusion passing through the protrusion through hole is accommodated.

In addition, a plurality of holes are provided in the second scroll, and the valve includes a valve support part fastened to the second scroll, a plurality of valve connection parts extending from the valve support part, and each of the plurality of connection parts. Including a plurality of valve bodies, the stopper includes a stopper support portion fastened to the second scroll, a plurality of stopper connection portions extending from the stopper support portion, and a plurality of stopper bodies formed on each of the plurality of stopper connection portions do.

In addition, the stopper includes a protrusion passing through the valve so that the stopper and the fastening hole of each of the valves are aligned, and the valve includes a protrusion through hole through which the protrusion passes, and the second scroll includes the And a protrusion receiving groove in which the protrusion passing through the protrusion through hole is accommodated.

In addition, the stopper includes a plurality of protrusions, the valve includes a plurality of protrusion through holes, the second scroll includes a plurality of protrusion receiving grooves, and the fastening hole of the stopper is between the plurality of protrusions. Is located in

In addition, the second scroll further includes a discharge port through which the compressed refrigerant is discharged.

Further, a back pressure plate formed in the second scroll and forming an intermediate pressure discharge port communicating with a compression chamber having an intermediate pressure among the plurality of compression chambers, and a back pressure chamber receiving the refrigerant discharged from the intermediate pressure discharge port; And a floating plate that is movably provided on one side of the back pressure plate and forms the back pressure chamber together with the back pressure plate.

Further, the back pressure plate covers the valve, stopper, and fastening member fastened to the second scroll, and a space for avoiding the valve, stopper, and fastening member is formed in the back pressure plate.

A scroll compressor according to another aspect includes a casing provided with a rotating shaft; A discharge cover fixed inside the casing and partitioning the inside of the casing into a suction space and a discharge space; A first scroll performing a orbiting motion by rotation of the rotation shaft; A second scroll forming a plurality of compression chambers together with the first scroll and having a bypass hole capable of communicating with at least one of the plurality of compression chambers, and a discharge port for discharging the compressed refrigerant; A valve fastened to the second scroll to open and close the bypass hole; A stopper for limiting a moving distance of the valve when the valve opens and closes the bypass hole; And a fastening member for fastening the valve and the stopper to the second scroll, wherein a fastening hole through which the fastening member passes is formed in each of the valve and the stopper, and the fastening member is provided in the second scroll. A fastening groove for fastening is formed, the fastening member penetrates the stopper and the valve and is coupled to the fastening groove of the second scroll, the fastening member is a rivet, and the rivet is a fastening inserted into the fastening groove. body; A head formed on the upper side of the fastening body; And a separation part detachable from the fastening body, wherein a thread or irregularities are formed on the inner circumferential surface of the fastening groove of the second scroll, and a thread formed on the inner circumferential surface of the fastening groove while the separation part is separated from the fastening body The outer circumferential surface of the fastening body is deformed by the unevenness and meshes with the thread or the unevenness.

A compressor according to another aspect includes: a first member having a hole through which a fluid flows; A valve fastened to the first member to open and close the hole; A rivet for fastening the valve to the first member; And a second member fastened to the first member and including a space for avoiding the rivet and the valve, wherein the first member includes a fastening groove having a thread or unevenness on an inner circumferential surface, and the rivet, A fastening body inserted into the fastening groove, a head formed on the top of the fastening body, and a separation part detachable from the fastening body, and formed on the inner circumferential surface of the fastening groove while the separation part is separated from the fastening body. The outer circumferential surface of the fastening body is deformed by a thread or irregularities that are formed, and in a state in which fastening of the rivet is completed, the modified fastening body engages with a thread or irregularities formed on the inner circumferential surface of the fastening groove.

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In addition, when the valve opens and closes the hole, it further includes a stopper for limiting a movement distance of the valve, and the rivet fastens the valve and the stopper to the first member.

According to the proposed embodiment, since the bypass valve and the stopper are fastened to the second scroll by the fastening member, there is an advantage of simplifying the assembly process.

In addition, since the fastening body constituting the fastening member is engaged with the threads or irregularities of the fastening groove of the second scroll by its own deformation, the fastening body is fastened to the fastening body even if vibration occurs during operation of the scroll compressor. There is an advantage that it is prevented from being separated from the groove.

In addition, since the fastening member is a rivet, the thickness of the head is small, so that the size of the space for avoiding the head of the fastening member formed on the back pressure plate disposed above the second scroll is reduced.

In addition, since one bypass valve can open and close a plurality of bypass holes, there is an advantage in that the number of parts is reduced and the assembly process is simplified.

1 is a cross-sectional view of a scroll compressor according to the present embodiment.
2 is an exploded cross-sectional view showing a partial configuration of a scroll compressor according to the present embodiment.
3 is a cross-sectional view showing a partial configuration of a scroll compressor according to the present embodiment.
4 is a view showing the bottom of the back pressure plate according to the present embodiment.
5 is a perspective view showing a fixed scroll according to the present embodiment.
6 is a view showing a state before the valve assembly is fixed to the fixed scroll according to the present embodiment.
7 is a view showing a state in which the valve assembly is fixed to the fixed scroll according to the present embodiment.
8 is a view showing a partial configuration of an orbiting scroll according to the present embodiment.
9 is a cross-sectional view showing a combination of a fixed scroll and an orbiting scroll according to the present embodiment.
10A to 10C are views showing the relative positions of the intermediate pressure discharge port of the fixed scroll and the discharge guide part of the orbiting scroll in the orbiting process of the orbiting scroll.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the constituent elements of the embodiment of the present invention, terms such as first, second, A, B, (a), (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but another component between each component It should be understood that may be “connected”, “coupled” or “connected”.

1 is a cross-sectional view of a scroll compressor according to the present embodiment, FIG. 2 is a cross-sectional view showing a partial configuration of the scroll compressor according to the present embodiment, and FIG. 3 is a cross-sectional view showing a partial configuration of the scroll compressor according to the present embodiment 4 is a view showing the bottom of the back pressure plate according to the present embodiment.

1 to 4, the scroll compressor 100 according to the present embodiment may include a casing 110 that forms a suction space S and a discharge space D.

In detail, a discharge cover 105 is provided on the inner upper part of the casing 110. The inner space of the casing 110 is divided into a suction space (S) and a discharge space (D) by the discharge cover (105). At this time, the upper space of the discharge cover 105 is the discharge space (D), and the lower space is the suction space (S). A discharge hole 105a through which the refrigerant compressed with high pressure is discharged is formed in an approximately central portion of the discharge cover 105.

The scroll compressor 100 may further include a suction port 101 communicating with the suction space S and a discharge port 103 communicating with the discharge space D. The suction port 101 and the discharge port 103 are each fixed to the casing 110 to suck the refrigerant into the casing 110 or discharge the refrigerant to the outside of the casing 110.

A motor may be disposed in the suction space S. The motor passes through the stator 112 coupled to the inner wall surface of the casing 110, the rotor 114 rotatably provided inside the stator 112, and the center of the rotor 114 It may include a drive shaft 116 arranged to be.

The lower side of the rotation shaft 116 is rotatably supported by an auxiliary bearing 117 installed under the casing 110. The auxiliary bearing 117 may be coupled to the lower frame 118 to stably support the rotation shaft 116.

The lower frame 118 may be fixed to the inner wall surface of the casing 110, and the upper space of the lower frame 118 is used as an oil storage space. The oil stored in the oil storage space is transferred upward by an oil supply passage 116a formed in the rotation shaft 116, so that the oil can be evenly supplied into the casing 110.

The oil supply passage (116a) is formed to be eccentric to one side of the rotation shaft (116), the oil flowing into the oil supply passage (116a) is raised by the centrifugal force generated by the rotation of the drive shaft (116) do.

The scroll compressor 100 may further include a main frame 120. The main frame 120 may be fixed to the inner wall surface of the casing 110 and may be located in the suction space S.

The upper portion of the rotation shaft 116 is rotatably supported by the main frame 120. A main bearing part 122 protruding downward is provided on the bottom of the main frame 120. The rotation shaft 116 is inserted into the main bearing part 122. The inner wall surface of the main bearing part 122 acts as a bearing surface and supports the rotation shaft 116 so that it can rotate smoothly.

The scroll compressor 100 may further include an orbiting scroll 130 and a fixed scroll 140. The orbiting scroll 130 may be mounted on the upper surface of the main frame 120.

The orbiting scroll 130 has a substantially circular plate shape and extends from the first hard plate part 133 and the first hard plate part 133 and is formed in a spiral shape. It may include. The first hard plate part 133 is a main body of the orbiting scroll 130 and forms a lower part of the orbiting scroll 130, and the orbiting wrap 134 extends upward from the first hard plate part 133 The upper portion of the orbiting scroll 130 is formed. In addition, the orbiting wrap 134 forms a compression chamber together with the fixed wrap 144 of the fixed scroll 140. The orbiting scroll 130 may be referred to as a “first scroll” and the fixed scroll 140 may be referred to as a “second scroll”.

The first hard plate part 133 of the orbiting scroll 130 is driven to orbit while being supported on the upper surface of the main frame 120, and between the first hard plate part 133 and the main frame 120, the An Oldham ring 136 for preventing rotation of the orbiting scroll 130 is provided. In addition, a boss portion into which the upper portion of the rotation shaft 116 is inserted so that the rotational force of the rotation shaft 116 is easily transmitted to the orbiting scroll 130 at the bottom of the first hard plate portion 133 of the orbiting scroll 130 ( 138) is provided.

The fixed scroll 140 engaged with the orbiting scroll 130 is disposed above the orbiting scroll 130.

The fixed scroll 140 may include a plurality of coupling guide portions 141 provided to protrude from the outer circumferential surface thereof and forming a guide hole 141a.

The scroll compressor 100 is inserted into the guide hole 141a to be inserted into the guide pin 142 and the guide pin 142 placed on the upper surface of the main frame 120 to insert the main frame 120 It may further include a fastening member (145a) fitted into the ball (125).

The fixed scroll 140 extends from the second hard plate part 143 and the second hard plate part 143 to the first hard plate part 133 formed in a substantially disk shape, so that the orbiting scroll 130 It may include a fixed wrap 144 engaged with the orbiting wrap 134.

The second hard plate part 143 is a main body of the fixed scroll 140 and forms an upper part of the fixed scroll 140, and the fixed wrap 144 extends downward from the second hard plate part 143 A lower portion of the fixed scroll 140 is formed. The orbiting wrap 134 may be referred to as a “first wrap”, and the fixed wrap 144 may be referred to as a “second wrap”.

An end of the fixing wrap 144 may be disposed to contact the first hard plate part 133, and an end of the orbiting wrap 134 may be disposed to contact the second hard plate part 143.

The fixed wrap 144 is arranged to form a spiral of a predetermined shape, and a discharge port 145 through which the compressed refrigerant is discharged is formed in an approximately central portion of the second hard plate part 143. In addition, a suction port 146 (refer to FIG. 8) through which the refrigerant existing in the suction space S is sucked is formed on the side of the fixed scroll 140. The refrigerant sucked through the suction port 146 is introduced into a compression chamber formed by the orbiting wrap 134 and the fixing wrap 144.

In detail, the fixed wrap 144 and the orbiting wrap 134 form a plurality of compression chambers, and the plurality of compression chambers are rotated toward the discharge port 145 and their volume is reduced to compress the refrigerant. Accordingly, among the plurality of compression chambers, the pressure of the compression chamber adjacent to the suction port 146 is minimized, and the pressure of the compression chamber communicating with the discharge port 145 becomes maximum, and the pressure of the compression chamber existing therebetween Has an intermediate pressure between the suction pressure of the suction port 146 and the discharge pressure of the discharge port 145. The intermediate pressure is applied to a back pressure chamber BP, which will be described later, and serves to press the fixed scroll 140 toward the orbiting scroll 130.

In the second end plate portion 143 of the fixed scroll 140, an intermediate pressure discharge port 147 for transferring the refrigerant from the compression chamber forming the intermediate pressure to the back pressure chamber BP is formed. In other words, the intermediate pressure discharge port 147, so that the pressure of the compression chamber communicating with the intermediate pressure discharge port 147 is greater than the pressure of the suction space (S) and less than the pressure of the discharge space (D), the fixed scroll ( 140) is formed at one position. The intermediate pressure discharge port 147 is formed to penetrate the second landscape part 143 from the upper surface to the lower surface of the second hard plate part 143.

The scroll compressor 100 may further include back pressure chamber assemblies 150 and 160 disposed above the fixed scroll 140 and forming the back pressure chamber. The back pressure chamber assemblies 150 and 160 may include a back pressure plate 150 and a floating plate 160 detachably coupled to the back pressure plate 150. The back pressure plate 150 is fixed on the second end plate portion 143 of the fixed scroll 140.

The back pressure plate 150 is formed in an approximately hollow annular shape, and includes a support portion 152 in contact with the second end plate portion 143 of the fixed scroll 140. An intermediate pressure suction port 153 communicating with the intermediate pressure discharge port 147 is formed in the support part 152. The intermediate pressure inlet 153 is formed to penetrate the support part 152 from the upper surface to the lower surface of the support part 152.

Further, a second fastening hole 154 communicating with a first fastening hole 148 formed in the second hard plate part 143 of the fixed scroll 140 is formed in the support part 152. The first fastening hole 148 and the second fastening hole 154 are coupled by a fastening member (not shown).

The back pressure plate 150 may include a plurality of walls 158 and 159 extending upward from the support part 152. The plurality of walls 158 and 159 include a first wall 158 extending upward from an inner peripheral surface of the support part 152 and a second wall 159 extending upward from an outer peripheral surface of the support part 152 Includes. The first wall 158 and the second wall 159 are formed in a substantially cylindrical shape.

The first wall 158 and the second wall 159 form a space part together with the support part 152, and a part of the space part becomes the back pressure chamber BP.

The first wall 158 includes an upper surface portion 158a forming an upper surface of the first wall 158. In addition, the first wall 158 communicates with the discharge port 145 of the second plate part 143 to discharge the refrigerant discharged from the discharge port 145 to the discharge cover 105 side. It includes a discharge port 158b. The intermediate discharge port 158b penetrates from the lower surface of the first wall 158 to the upper surface 158a.

The inner space of the cylindrical first wall 158 communicates with the discharge port 145 to form a part of a discharge passage for flowing the discharged refrigerant into the discharge space D.

Inside the first wall 158, a discharge valve device 108 having a substantially cylindrical shape is provided. The discharge valve device 108 is disposed above the discharge port 145 and has a size sufficient to completely cover the discharge port 145. For example, the outer diameter of the discharge valve device 108 may be larger than the diameter of the discharge port 145.

Accordingly, when the discharge valve device 108 contacts the second end plate portion 143 of the fixed scroll 140, the discharge valve device 108 may close the discharge port 145.

The discharge valve device 108 may move upward or downward according to a change in pressure acting on the discharge valve device 108. In addition, the inner circumferential surface of the first wall 158 forms a movement guide part 158c that guides the movement of the discharge valve device 108.

A discharge pressure applying hole 158d is formed in the upper surface 158 of the first wall 158. The discharge pressure applying hole 158d communicates with the discharge space D. The discharge pressure applying hole 158d may be formed at a substantially central portion of the upper surface portion 158, and a plurality of intermediate discharge ports 158b may be disposed to surround the discharge pressure applying hole 158d.

As an example, when the operation of the scroll compressor 100 is stopped and the refrigerant flows back from the discharge space D toward the discharge port 145, the pressure applied to the discharge pressure applying hole 158d is the discharge port. It becomes higher than the pressure on the (145) side. That is, a downward pressure acts on the upper surface of the discharge valve device 108, and accordingly, the discharge valve device 108 closes the discharge port 145 while moving downward.

On the other hand, when the scroll compressor 100 is operated to compress the refrigerant in the compression chamber, when the pressure at the discharge port 145 is higher than the pressure in the discharge space D, the lower surface of the discharge valve device 108 In this case, upward pressure acts, and accordingly, the discharge valve device 108 opens the discharge port 145 while moving upward.

When the discharge port 145 is opened, the refrigerant discharged from the discharge port 145 flows toward the discharge cover 105 through the intermediate discharge port 158b, and passes through the discharge hole 105a to the discharge port ( It is discharged to the outside of the compressor 100 through 103).

The back pressure plate 150 includes a stepped portion 158e provided inside a portion where the first wall 158 and the support portion 152 are connected. The refrigerant discharged from the discharge port 145 may flow to the intermediate discharge port 158b after reaching the space defined by the stepped portion 158e.

The second wall 159 is spaced apart from the first wall 158 by a predetermined distance and is disposed to surround the first wall 158.

In the back pressure plate 150, a space portion having a vertical cross section of an approximately'U' shape is formed by the first wall 158, the second wall 159, and the support part 152. In addition, the floating plate 160 is accommodated in the space part. Among the spaces, a space covered by the floating plate 160 becomes the back pressure chamber BP.

In other words, the first and second walls 158 and 159 of the back pressure plate 150 and the support part 152 and the floating plate 160 form the back pressure chamber BP.

The floating plate 160 includes an inner peripheral surface facing the outer peripheral surface of the first wall 158 and an outer peripheral surface facing the inner peripheral surface of the second wall 159. The inner circumferential surface of the floating plate 160 may contact the outer circumferential surface of the first wall 158 or the outer circumferential surface of the floating plate 160 may contact the inner circumferential surface of the second wall 159.

In this case, the inner diameter of the floating plate 160 may be equal to or greater than the outer diameter of the first wall 158 of the back pressure plate 150. The outer diameter of the floating plate 160 may be equal to or smaller than the inner diameter of the second wall 159 of the back pressure plate 150.

The floating plate 160 and at least one of the first and second walls 158 and 159 may be provided with a sealing member 159a for preventing leakage of the refrigerant in the back pressure chamber BP.

The sealing member 159a may prevent a refrigerant from leaking between the inner circumferential surface of the second wall 159 and the outer circumferential surface of the floating plate 160. In addition, a sealing member for preventing refrigerant leakage between the outer circumferential surface of the first wall 158 and the inner circumferential surface of the floating plate 160 may be provided on the first wall 158 or the inner circumferential surface of the floating plate 160. I can.

A rib 164 extending upward is provided on the upper surface of the floating plate 160. For example, the rib 164 extends upwardly around the inner peripheral surface of the floating plate 160.

When the floating plate 160 is raised, the ribs 164 may contact the lower surface of the discharge cover 105. When the ribs 164 contact the discharge cover 105, the suction space S and the discharge space D are partitioned. On the other hand, when the rib 164 is spaced apart from the lower surface of the discharge cover 105, that is, when moving in a direction away from the discharge cover 105, the suction space S and the discharge space D are Can be communicated.

In detail, while the scroll compressor 100 is operated, the floating plate 160 moves upward so that the ribs 164 contact the lower surface of the discharge cover 105. Accordingly, the refrigerant discharged from the discharge port 145 and passed through the intermediate discharge port 158b may be discharged to the discharge space D without leaking into the suction space S.

On the other hand, when the scroll compressor 100 is stopped, the floating plate 160 moves downward, and the rib 164 is spaced apart from the bottom surface of the discharge cover 105. Accordingly, the discharged refrigerant located on the discharge cover 105 side flows toward the suction space S through the spaced apart between the rib 164 and the discharge cover 105.

In addition, when the scroll compressor 100 is stopped, the floating plate 160 moves downward so that the rib 164 is separated from the lower surface of the discharge cover 105.

5 is a perspective view showing a fixed scroll according to the present embodiment, FIG. 6 is a view showing a state before the valve assembly is fixed to the fixed scroll according to the present embodiment, and FIG. 7 is a valve on the fixed scroll according to the present embodiment. This is a diagram showing the assembly in a fixed state.

Referring to FIGS. 2 and 5 to 7, the fixed scroll 140 includes one or more bypass holes 149 formed at one side of the discharge port 145. In FIG. 5, for example, two bypass holes 149 are formed in the fixed scroll 140, but it is noted that there is no limit to the number of bypass holes 149 in this embodiment. The bypass hole 149 is formed to pass through the second hard plate portion 143 and extends to a compression chamber formed by the fixing wrap 144 and the orbiting wrap 134.

Here, the position of the bypass hole 149 may be set differently depending on the operating conditions, but may be formed to communicate with a compression chamber having a pressure of 1.5 times the suction pressure, for example. Further, the pressure of the compression chamber communicating with the bypass hole 149 is greater than the pressure of the compression chamber communicating with the intermediate pressure discharge port 147.

The scroll compressor 100 includes a valve assembly 124, 220 for opening and closing the bypass hole 149, and a fastening member for fastening the valve assembly 124, 220 to the fixed scroll 140 ( 230) may be further included.

The valve assemblies 124 and 220 include a bypass valve 124 for opening and closing the bypass hole 149 and the bypass valve 124 when the bypass hole 149 is opened. It may include a stopper 220 to limit the movement distance of the valve 124.

In addition, the fastening member 230 may simultaneously fasten the bypass valve 124 and the stopper 220 to the fixed scroll 140.

Accordingly, according to the present embodiment, there is an advantage that the operation for fastening the bypass valve 124 and the stopper 220 to the fixed scroll 140 is simplified.

In detail, the bypass valve 124 includes a valve support part 124a fixed to the second end plate part 143 of the fixed scroll 140 by the fastening member 230.

The bypass valve 124 further includes a valve connection part 124b extending from the valve support part 124a and a valve body 124c provided at one side of the valve connection part 124b. The number of each of the valve connection portions 124b and the valve body 124c is the same as the number of the bypass holes 149. In FIG. 5, for example, it is shown that the bypass valve 124 includes two valve connection portions 124b and two valve bodies 124c.

The valve body 124c maintains a state in contact with the upper surface of the second end plate part 143 and has a size sufficient to cover all of the bypass holes 149.

At this time, the valve body 124c moves by the pressure of the refrigerant flowing along the bypass hole 149 to open the bypass hole 149. Accordingly, so that the valve body 124c moves smoothly, the width of the valve connection portion 124b may be formed to be smaller than the diameter of the valve body 124c.

When the bypass valve 124 opens the bypass hole 149, the refrigerant in the compression chamber communicating with the bypass hole 149 passes through the bypass hole 149 to the fixed scroll 140 and By flowing into the space between the back pressure plates 150, the discharge port 145 may be bypassed. Then, the bypassed refrigerant flows toward the discharge hole 105a of the discharge cover 105 through the intermediate discharge port 158b.

The stopper 220 is formed in a shape corresponding to the bypass valve 124 and is located above the bypass valve 124.

The bypass valve 124 may be elastically deformed by the refrigerant pressure, and the stopper 220 serves to limit the movement of the bypass valve 124, so the thickness of the stopper 220 is It is larger than the thickness of the valve 124.

The stopper 220 may include a stopper support portion 221 in contact with the valve support portion 124a. In addition, the stopper 220 may further include a stopper connecting portion 225 extending from the stopper supporting portion 221 and a stopper body 228 provided at one side of the stopper connecting portion 225.

The number of each of the stopper connection parts 225 and the stopper body 228 is the same as the number of each of the valve connection parts 124b and the valve body 124c.

The stopper connection part 225 may be inclined upward as it moves away from the stopper support part 221. Therefore, in a state in which the bypass valve 124 and the stopper 220 are fastened to the second end plate 143 by the fastening member 230, the valve body 124c may be formed of the second end plate part ( In contact with the upper surface of the 143, the stopper body 228 is spaced apart from the upper surface of the valve body (124c).

And, when the valve body 124c is lifted upward by the refrigerant flowing through the bypass hole 149, the upper surface of the valve body 124c comes into contact with the stopper body 228, so that the valve body (124c) stops.

Each of the stopper support part 221, the bypass valve 124, and the second end plate part 143 is provided with fastening holes 223 and 124d and fastening grooves 148a for fastening the fastening member 230. do.

In the stopper support part 221, the alignment of the fastening holes 223, 124d and the fastening grooves 148a before the fastening member 230 is fastened to the fastening holes 223 and 124d and the fastening grooves 148a One or more guide protrusions 222 for holding are provided. A protrusion through hole 124e through which the guide protrusion 222 passes is formed in the valve support part 221, and a protrusion accommodating groove for accommodating the guide protrusion 222 is formed in the second end plate part 143 ( 148b) is provided.

Therefore, when the guide protrusion 222 of the stopper 220 is accommodated in the protrusion receiving groove 148b while passing through the protrusion through hole 124e of the bypass valve 124, the stopper support part 221 , Fastening holes 223 and 124d and fastening grooves 148a of each of the bypass valve 124 and the second end plate 143 may be aligned.

The stopper 220 is arranged so that the fastening holes 223 and 124d and the fastening groove 148a of the stopper support 221, the bypass valve 124, and the second end plate 143 are more accurately aligned. Includes a plurality of guide protrusions 222, the bypass valve 124 includes a plurality of protrusion through holes 124e, and the fixed scroll 140 may include a plurality of protrusion receiving grooves 148b. have.

In this case, the fastening hole 223 may be positioned between the plurality of guide protrusions 222 in the stopper 220. In addition, a fastening hole 124d may be positioned between the plurality of protruding through holes 124e in the bypass valve 124, and the plurality of protrusion receiving grooves 148b in the second end plate portion 143 A fastening groove 148a may be positioned between.

Therefore, in a state in which the fastening member 230 fastens the bypass valve 124 and the stopper 150 to the fixed scroll 140, the fastening member 230 is disposed between the plurality of guide protrusions 222. Since it is located at, there is an advantage that the fastening force of the fastening member 230 can uniformly act on the plurality of valve bodies 124c of the bypass valve.

The fastening member 230 may be, for example, a blind rivet. The fastening member 230 is fastened to the fastening holes 223 and 124d and fastening grooves 148a of the stopper support part 221, the bypass valve 124, and the second end plate part 143, respectively. The body 231 and a head 232 formed on the upper side of the fastening body 231 and contacting the upper surface of the stopper support 221, and the fastening body 231 through the head 232 It is located inside and may include a separating portion 233 that can be separated from the fastening body 231.

Further, when the separating part 233 is pulled upward in FIG. 6, the separating part 223 is separated from the fastening body 231 as shown in FIG. 7 so that the fastening of the fastening member can be completed.

In this embodiment, in order to increase the fastening force between the fastening member 230 and the fixed scroll 140, the inner circumferential surface of the fastening groove 148a formed in the second end plate 143 has a thread 148c as shown in FIG. Alternatively, irregularities may be formed. And, when the separating part 233 is separated from the fastening body 231, the fastening body 231 is deformed in the process of separating the separating part 233 from the fastening body 231, and the fastening body ( The outer circumferential surface of 231 is engaged with the thread 148c or irregularities of the inner circumferential surface of the fastening groove 148a. Accordingly, the fastening body 231 may also have the same or similar threads or irregularities as the threads 148c or the irregularities of the fastening holes 148a, so that the fastening force of the fastening member 230 may be increased.

If a screw is used as the fastening member 230, the depth of the fastening groove 148a formed in the second end plate 143 should be increased, and the screw is fastened to the fastening groove 148a by rotating motion. Therefore, there may be a problem in that the screw is rotated in the fastening disengagement direction in the fastening groove due to vibration generated during operation of the scroll compressor in a state where the screw is fastened and the screw is separated from the fastening groove.

However, in the case of the present embodiment, the fastening body 231 is not fastened by a rotational motion to the threads 148b or irregularities of the fastening groove 148a, but the fastening body 231 by deformation of the fastening body 231 231) itself is meshed with the screw threads 148c or irregularities of the fastening hole 148a, so that the fastening body 231 is prevented from being separated from the fastening groove 148a even when vibration occurs during operation of the scroll compressor. There is an advantage.

In addition, in the present embodiment, the back pressure plate 150 covers the bypass valve 124, the stopper 220, and the fastening member 230 fastened to the fixed scroll 140. At this time, since the thickness of the head 232 of the fastening member 230 is smaller than the thickness of the head of the screw, the bypass valve 124 is attached to the back pressure plate 150 fastened to the upper side of the fixed scroll 140. , There is an advantage that the size of a space (for example, a stepped jaw) for avoiding the stopper 220 and the head 232 of the fastening member 230 is reduced.

In addition, since one bypass valve 124 can open and close a plurality of bypass holes 149, there is an advantage that the number of parts is reduced and the assembly process is simplified.

Meanwhile, the intermediate pressure discharge port 147 of the fixed scroll 140 and the intermediate pressure suction port 153 of the back pressure plate 150 are arranged to be aligned with each other. The refrigerant discharged from the intermediate pressure discharge port 147 may be introduced into the back pressure chamber BP through the intermediate pressure suction port 153. The intermediate pressure discharge port 147 and the intermediate pressure suction port 153 may be referred to as "bypass flow paths" in that they bypass the refrigerant in the back pressure chamber BP to the compression chamber.

8 is a view showing a partial configuration of an orbiting scroll according to the present embodiment, FIG. 9 is a cross-sectional view showing a combination of a fixed scroll and an orbiting scroll according to the present embodiment, and FIGS. 10A to 10C are orbiting the orbiting scroll In the process, it is a diagram showing the relative positions of the intermediate pressure discharge port of the fixed scroll and the discharge guide part of the orbiting scroll.

First, referring to FIGS. 8 and 9, the refrigerant flowing through the intermediate pressure discharge port 147 flows into a space (area) having a pressure lower than the pressure of the back pressure chamber BP. It may include a discharge guide part 139 to guide it to be.

In detail, when the operation of the scroll compressor 100 is stopped, the compression chamber formed by the orbiting wrap 134 and the fixed wrap 144 is extinguished, and the refrigerant is present between the orbiting wrap 134 and the fixed wrap 144 The space (area) flows. In this case, the space (area) has a pressure lower than that of the back pressure chamber BP. The space (area) is referred to as "lab space part".

The discharge guide part 139 is configured to be recessed in the end surface of the orbiting wrap 134 of the orbiting scroll 130. Therefore, the discharge guide part 139 may be referred to as a "depressed part". The "end surface" of the orbiting wrap 134 means a surface of the orbiting wrap 134 facing the second hard plate 143 of the fixed scroll 140 or in contact with the second hard plate 143 It can be understood as cotton.

The width of the end surface of the orbiting wrap 134, that is, the thickness of the orbiting wrap 134 is formed larger than the width of the intermediate pressure discharge port 147. In addition, the discharge guide part 139 may be configured to be recessed in a set width and depth from the end surface of the orbiting wrap 134.

During the orbiting movement of the orbiting scroll 130, the orbiting wrap 134 is positioned directly below the intermediate pressure discharge port 147, or the intermediate pressure discharge port so that the intermediate pressure discharge port 147 can be opened. It may be positioned to be spaced apart from the lower end of 147 in the horizontal direction.

If the discharge guide part 139 is not provided, when the orbiting wrap 134 is located directly below the intermediate pressure discharge port 147 (see FIG. 9), the orbiting wrap 134 is The pressure discharge port 147 is shielded. On the other hand, when the orbiting wrap 134 is moved by a predetermined distance in the horizontal direction, at least a portion of the intermediate pressure discharge port 147 may be opened. And, while the scroll compressor 100 is operated, when the intermediate pressure discharge port 147 is opened, the intermediate pressure refrigerant in the compression chamber can be introduced into the back pressure chamber BP through the intermediate pressure discharge port 147. have.

On the other hand, when the scroll compressor 100 is stopped, the revolving wrap 134 is located directly below the intermediate pressure discharge port 147 and the intermediate pressure discharge port 147 is blocked, the back pressure chamber BP Since the refrigerant cannot flow into the lab space through the intermediate pressure discharge port 147, the equilibrium pressure cannot be maintained and rapid restart of the compressor may be restricted.

Therefore, in the present embodiment, by forming the discharge guide part 139 on the orbiting wrap 134 so that the intermediate pressure discharge port 147 is not completely shielded or sealed, the orbiting wrap 134 is the intermediate pressure discharge port ( Even if it is located directly below the 147, the intermediate pressure discharge port 147 and the compression chamber (when the compressor is driven), or the intermediate pressure discharge port 147 and the lab space (when the compressor is stopped) can be communicated.

Referring to FIGS. 10A to 10C, a plurality of compression chambers are formed during the orbiting movement of the orbiting scroll 130, and the plurality of compression chambers move toward the discharge port 145 while their volume decreases.

In this process, the orbiting wrap 134 of the orbiting scroll 130 selectively opens the bypass hole 149. For example, when the orbiting wrap 134 opens the bypass hole 149, the refrigerant in the compression chamber communicating with the bypass hole 149 flows through the bypass hole 149, thereby causing the discharge port 145 ) Is bypassed. On the other hand, when the orbiting wrap 134 shields the bypass hole 149, the refrigerant in the compression chamber is restricted from flowing through the bypass hole 149.

Meanwhile, the back pressure chamber BP and the intermediate pressure discharge port 147 may always be in communication with the compression chamber by the discharge guide part 139. That is, the discharge guide part 139 is formed at the end of the orbiting wrap 134 at a position such that the back pressure chamber BP and the intermediate pressure discharge port 147 are always in communication with the compression chamber.

In summary, even when the orbiting wrap 134 is located directly below the intermediate pressure discharge port 147 in the process of being rotated, the intermediate pressure discharge port 147 due to the recessed configuration of the discharge guide part 139 The lower end of and the end surface of the orbiting wrap 134 may be spaced apart from each other. Accordingly, when the scroll compressor is driven, the refrigerant in the compression chamber may be introduced into the back pressure chamber BP through the intermediate pressure discharge port 147. When the scroll compressor is stopped, the refrigerant in the back pressure chamber BP may flow into the lab space through the intermediate pressure discharge port 147.

In detail, FIGS. 11A to 11C show that the orbiting wrap 134 is positioned directly under the intermediate pressure discharge port 147 during the orbiting movement, that is, if there is no discharge guide part 139, the orbiting wrap 134 It shows a state in which the end surface of is in a position to block the intermediate pressure discharge port 147.

In the above embodiment, the valve assembly and the fastening member that are fastened to the fixed scroll of the scroll compressor have been described as an example, but the same can be applied even when the valve assembly is fastened to a configuration other than the fixed scroll.

In addition, in the above embodiment, a scroll compressor has been described as the type of compressor. However, it should be noted that the valve assembly and a configuration for fastening the valve assembly can be applied equally to other types of compressors other than the scroll compressor.

In this case, a member that is fastened to the valve assembly and has a hole through which the fluid flows may be referred to as a first member, and a member that is fastened to the first member and forms an avoidance space of the valve assembly may be referred to as a second member.

100: scroll compressor 105: discharge cover
120: main frame 124: bypass valve
130: orbiting scroll 140: fixed scroll
149: bypass hole 150: back pressure plate
160: floating plate 220: stopper
230: fastening member

Claims (13)

A casing provided with a rotating shaft;
A discharge cover fixed inside the casing and partitioning the inside of the casing into a suction space and a discharge space;
A first scroll performing a orbiting motion by rotation of the rotation shaft;
A second scroll positioned above the first scroll to form a plurality of compression chambers together with the first scroll, and having a hole capable of communicating with at least one of the plurality of compression chambers;
An intermediate pressure discharge port formed in the second scroll and communicating with a compression chamber having an intermediate pressure among the plurality of compression chambers except for the one or more compression chambers;
A back pressure plate positioned above the second scroll and forming a back pressure chamber for receiving the refrigerant discharged from the intermediate pressure discharge port;
A valve fastened to the second scroll to open and close the hole; And
Including a fastening member for fastening the valve to the second scroll,
The back pressure plate covers the valve and the fastening member fastened to the second scroll,
In the back pressure plate, a space for avoiding the valve and the fastening member is formed,
In the second scroll, the fastening member may be fastened and a fastening groove having irregularities on an inner circumferential surface thereof is provided,
The fastening member penetrates the valve and is fastened to the fastening groove,
The fastening member is a rivet,
The rivet may include a fastening body inserted into the fastening groove;
A head formed on the upper side of the fastening body; And
Including a separable part detachable from the fastening body,
The fastening groove is formed by being recessed downward from the upper surface of the second scroll facing the back pressure plate to accommodate the fastening body,
A scroll compressor in which the outer circumferential surface of the fastening body is deformed by the irregularities formed on the inner circumferential surface of the fastening groove while the separating part is separated from the fastening body, thereby engaging the irregularities. The method of claim 1,
Further comprising a stopper for limiting the moving distance of the valve when the valve opens the hole,
In order for the fastening member to fasten the stopper and the valve to the second scroll, each of the stopper and the valve includes a fastening hole. The method of claim 2,
The stopper includes a protrusion passing through the valve so that the stopper and the fastening hole of each of the valves are aligned,
The valve includes a protrusion through hole through which the protrusion passes,
The second scroll scroll compressor comprising a protrusion receiving groove in which the protrusion passing through the protrusion through hole is accommodated. The method of claim 2,
The hole is provided with a plurality of the second scroll,
The valve, a valve support portion fastened to the second scroll,
A plurality of valve connection parts extending from the valve support part,
Including a plurality of valve bodies formed on each of the plurality of connection parts,
The stopper, a stopper support portion fastened to the second scroll,
A plurality of stopper connection portions extending from the stopper support portion,
A scroll compressor comprising a plurality of stopper bodies formed on each of the plurality of stopper connection parts. The method of claim 4,
The stopper includes a protrusion passing through the valve so that the stopper and the fastening hole of each of the valves are aligned,
The valve includes a protrusion through hole through which the protrusion passes,
The second scroll scroll compressor comprising a protrusion receiving groove in which the protrusion passing through the protrusion through hole is accommodated. The method of claim 5,
The stopper includes a plurality of projections,
The valve includes a plurality of protruding through holes,
The second scroll includes a plurality of protrusion receiving grooves,
The fastening hole of the stopper is a scroll compressor positioned between the plurality of protrusions. The method of claim 1,
The second scroll scroll compressor further comprises a discharge port through which the compressed refrigerant is discharged. The method of claim 1,
A scroll compressor further comprising a floating plate provided to be movable on one side of the back pressure plate and forming the back pressure chamber together with the back pressure plate. The method of claim 8,
The valve further comprises a stopper provided to limit the movement distance of the valve when opening the hole and fastened to the second scroll together with the valve by the fastening member,
The back pressure plate further covers the stopper,
A scroll compressor capable of avoiding the stopper by the space of the back pressure plate. A casing provided with a rotating shaft;
A discharge cover fixed inside the casing and partitioning the inside of the casing into a suction space and a discharge space;
A first scroll performing a orbiting motion by rotation of the rotation shaft;
A bypass hole disposed above the first scroll to form a plurality of compression chambers together with the first scroll, a bypass hole capable of communicating with at least one of the plurality of compression chambers, and a discharge port for discharging the compressed refrigerant; A second scroll having an intermediate pressure discharge port communicating with a compression chamber having an intermediate pressure among the plurality of compression chambers excluding one or more compression chambers;
A back pressure plate positioned above the second scroll and forming a back pressure chamber for receiving the refrigerant discharged from the intermediate pressure discharge port;
A valve fastened to the second scroll to open and close the bypass hole;
A stopper for limiting a moving distance of the valve when the valve opens and closes the bypass hole; And
Including a fastening member for fastening the valve and the stopper to the second scroll,
The back pressure plate covers the valve, the stopper, and the fastening member fastened to the second scroll,
In the back pressure plate, a space for avoiding the valve, the stopper, and the fastening member is formed,
Each of the valve and the stopper has a fastening hole through which the fastening member penetrates, and a fastening groove for fastening the fastening member is formed in the second scroll,
The fastening member is coupled to the fastening groove of the second scroll through the stopper and the valve,
The fastening member is a rivet,
The rivet may include a fastening body inserted into the fastening groove;
A head formed on the upper side of the fastening body; And
Including a separable part detachable from the fastening body,
The fastening groove is formed by being recessed downward from the upper surface of the second scroll facing the back pressure plate to accommodate the fastening body,
Unevenness is formed on the inner circumferential surface of the fastening groove of the second scroll,
A scroll compressor in which the outer circumferential surface of the fastening body is deformed by the irregularities formed on the inner circumferential surface of the fastening groove while the separating part is separated from the fastening body, thereby engaging the irregularities. delete delete delete

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