KR100557057B1 - Scroll compressor with volume regulating capability - Google Patents

Abstract

The capacity adjustable scroll compressor according to the present invention includes a bypass port formed by opening a wall of the scroll member compression space of the scroll compressor; A bypass conduit having one end connected to the bypass port and the other end connected to a suction chamber in which a fluid in a low pressure state before being compressed in the scroll compressor is stored; A blocking valve for manipulating the connection state of the bypass port and the bypass conduit to an open / closed state; In order to adjust the position of the blocking valve to an open or closed position, a low pressure fluid pressure of the scroll compressor inlet and a high pressure fluid pressure of the scroll compressor discharge port may be selectively applied to the blocking valve through a predetermined conduit. An adjustment valve is included.

The capacity-controlled scroll compressor according to the present invention has the effect of varying the compression capacity by using the bypass function of the fluid even in a simple configuration in the same rotation speed of the compression motor.

In addition, the present invention has the effect of reducing the manufacturing cost of the scroll compressor by driving the valve by using the fluid pressure before and after being compressed by the scroll compressor, without additional configuration.

Capacity adjustable, scroll compressor

Description

Scroll compressor with volume regulating capability}

1 is a view for explaining the configuration of a scroll compressor according to the spirit of the present invention.

2 is a bottom view of the non-orbiting scroll member according to the present invention.

3 and 5 are enlarged views of part “A” in FIG. 1.

4 and 6 conceptually illustrate the state of the scroll member according to the open / closed state of the bypass port.

7 illustrates another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

11 sealant outer shell 12 sealed plate 13 suction chamber

14 discharge chamber 15 non-orbiting scroll member

16: pivoting scroll member 17: non-orbiting spiral wrap

18: turning spiral wrap 19: drive shaft

21: bearing 22: suction port 23: discharge port

24 bypass port 25 blocking valve 26 center discharge line

31: bypass pipeline

The present invention relates to a scroll compressor, and more particularly, to a capacity-controlled scroll compressor that can conveniently adjust the discharge capacity of the scroll compressor.

A refrigeration system is a system applied to an air conditioner or a refrigerator and is used as an apparatus for cooling a temperature of a specific portion by absorption and release of heat by a refrigerant circulating in a refrigeration cycle. In detail, the refrigeration system is a system for cooling the inside of the system by repeatedly performing an operation of absorbing heat inside the boundary and dissipating heat absorbed to the outside of the system.

Such a refrigeration system is composed of a series of processes leading to compression, condensation, expansion, and evaporation, and in such a series of processes, a scroll compressor performs a function of compressing a refrigerant.

On the other hand, the scroll compressor is already known by a number of documents such as the applicant of the present invention, Korean Patent Application No. "10-1999-0000607", the name of the invention, "scroll compressor", etc. In general, description of the configuration and operation will be omitted.

The present invention relates to a volume-controlled scroll compressor that can vary the compression capacity of the fluid being compressed by the operation of the scroll compressor. Hereinafter, the reason why the compression capacity of the compressor is required in the operation of the scroll compressor will be described.

In selecting a scroll compressor for a particular application, it is anticipated that it will be used in the most adverse operating conditions, for example, where the highest compression capacity is required (eg heating operation of an air conditioner with a heat pump) and small compression capacity. It is common to select a scroll compressor in anticipation of the necessary conditions (e.g., cooling operation of the air conditioner). However, it is common that such adverse conditions hardly occur in actual operation. Therefore, if one chooses a compressor with a large capacity in anticipation of the worst condition in selecting the compressor, the compressor operates under low load conditions for a high ratio of operating time. This operation, in turn, lowers the overall operating efficiency of the system.

Therefore, there is a need for a compressor capable of adjusting the compression capacity so as to improve the overall operating efficiency under normal operating conditions, while allowing the compressor to accept operating conditions even under the most adverse conditions.

As such, the method applied to vary the compression capacity of the scroll compressor includes an electric method of controlling the rotation speed of the scroll compressor and a method of using leakage.

However, the method of varying the compression capacity of the conventional scroll compressor has the following problems.

First, the method of controlling the rotational speed is excellent in performance, but additional components such as an inverter for controlling the motor at the correct rotational speed are required, and it is difficult to secure reliability of the friction part at high speed. In addition, a method of using leakage includes Korean Patent Application No. 10-2001-0062567 (US Patent Application No. 09 / 686,561) and the like, and since such a method also applies a large number of complicated parts, manufacturing cost increases. there is a problem.

SUMMARY OF THE INVENTION The present invention has been proposed to solve this problem, and an object of the present invention is to propose a capacity-controlled scroll compressor that can vary the compression capacity by using a bypass function while the rotation speed of the compression motor is the same. do.

In addition, the present invention proposes a capacity-controlled scroll compressor that can vary the compression capacity by driving a predetermined valve by using the fluid pressure before and after being compressed by the scroll compressor, without additional configuration. It aims to do it.

According to another aspect of the present invention, a scroll compressor includes a bypass port formed by opening a wall of a scroll member compression space of a scroll compressor; A bypass conduit having one end connected to the bypass port and the other end connected to a suction chamber in which a fluid in a low pressure state before being compressed in the scroll compressor is stored; A blocking valve for manipulating the connection state of the bypass port and the bypass conduit to an open / closed state; In order to adjust the position of the blocking valve to an open or closed position, a low pressure fluid pressure of the scroll compressor inlet and a high pressure fluid pressure of the scroll compressor discharge port may be selectively applied to the blocking valve through a predetermined conduit. An adjustment valve is included.

According to another aspect of the present invention, a scroll compressor includes a bypass port formed in a compression path of a scroll member; A blocking valve for manipulating the open state or closed state of the bypass port; A bypass adjustment structure for adjusting the open state or closed state of the blocking valve to the pressure at the suction port side of the scroll compressor and / or the pressure at the discharge port side of the scroll compressor is included.

By the capacity-controlled scroll compressor as shown, it is possible to operate by varying the compression capacity of the scroll compressor without additional configuration.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention are easily facilitated by adding, changing, or deleting other elements. Can suggest.

1 is a view for explaining the configuration of a scroll compressor according to the spirit of the present invention.

Referring to FIG. 1, the capacity adjustable scroll compressor according to the present invention includes a general structure of a scroll compressor, a bypass structure for adjusting the compression capacity, and a bypass adjustment structure for adjusting the bypass structure.

First, a general scroll compressor includes a hermetic outer shell 11 which seals the inside of the system and separates it from the outer world, and is formed in the hermetic outer shell 11 to draw the inside of the compressor into a low pressure suction chamber 13 and a high pressure. The sealing plate 12 separating the discharge chamber 14 of the discharge chamber, the suction port 22 through which the fluid compressed in connection with the suction chamber 13 is sucked, and the fluid compressed in connection with the discharge chamber 14 A discharge port 23 to be discharged, a non-orbiting scroll member 15 fixed to the hermetic outer shell 11, a drive shaft 19 extending from a motor (not shown) and having an upper end eccentrically formed, and the drive shaft 19 Is intermittently interviewed with the non-orbiting helical wrap 17 and the non-orbiting helical wrap 17 as a compression path of air formed in the non-orbiting scroll member 15 and the orbiting scroll member 16 associated with Pivoting spiral wraps 18 forming a compressed path of air and In addition, a bearing 21 for safely supporting the drive shaft 19 and a central discharge pipe 26 for discharging the compressed fluid through the central portion of the non-orbiting scroll member 15 to the discharge chamber 14 are provided. Included.

In addition, the bypass structure includes a bypass port 24 formed by opening a predetermined portion other than the center of the non-orbiting scroll member 15 and a rear portion of the bypass port 24 so as to provide a fluid path. A bypass valve 31, which is a pipe line for guiding the blocking valve 25 and a fluid branched from the blocking valve 25 to allow the fluid discharged through the bypass port 24 to flow out into the suction chamber 13. Included.

In addition, the bypass adjustment structure includes an adjustment pipe line 30 connected to the blocking valve 25 to provide a pressure for adjusting the blocking valve 25, and a pressure applied to the control pipe 30 is a low pressure pipe line. A control valve 29 is included for selectively switching from the 27 or the high pressure line 28 to be supplied.

In particular, the low pressure line 27 is connected to the control valve 29 and the other end is connected to the suction port 22, the pressure of the suction port 22 is applied to the low pressure pipe 27. In addition, one end of the high pressure line 28 is connected to the control valve 29 and the other end thereof is connected to the outlet 23 so that the pressure of the outlet 23 is applied to the high pressure line 28.

In detail, the blocking valve 25 is a float valve is applied, by the object to move freely inside the predetermined housing, to freely move in the direction of the pressure to change the connection state of the pipeline.

For example, a structure in which the cylindrical member as shown in the figure moves inside the circular housing can be freely moved in a direction in which low pressure is applied from both sides. As another example, a circular bead may be formed on the inner circumference of the housing to freely move the inside of the housing, and may be used as a constant valve for opening and closing a vent through which a fluid flows.

In addition, the regulating valve 29 may be a solenoid valve which is moved by a predetermined controller.

The operation of the pressure-controlled scroll compressor as described above will be briefly described. First, in the general scroll compressor, when the driving shaft 19 connected to the motor (not shown) is rotated, the turning scroll member 16 in contact with the driving shaft 19 is pivoted. At this time, the non-orbiting scroll member 15 is in a stationary state.

When the swinging scroll member 16 is rotated, it is formed between the swinging spiral wrap 18 formed on the swinging scroll member 16 and the non-turning spiral wrap 17 formed on the non-turning scroll member 15. The low pressure compressed fluid inside the suction chamber 13 flows into the space to be compressed.

The compressed fluid is discharged to the discharge chamber 14 through a central discharge pipe 26 formed at the center of the non-orbiting scroll member 15, and the high pressure fluid of the discharge chamber 14 is discharge port 23. Is discharged through.

On the other hand, as the bypass structure of the fluid under compression, the blocking valve 25 is formed, and when the blocking valve 25 is closed, the fluid cannot be discharged through the bypass port 24. However, when the blocking valve 25 is open, the fluid via the bypass port 24 is discharged to the inside of the suction chamber 13 through the bypass conduit 31 and is bypassed. Therefore, when the blocking valve 25 is open, the compression capacity is lowered.

On the other hand, as the bypass adjustment structure for adjusting the bypass structure, in order to adjust the operation of the blocking valve 25, one end is connected to the blocking valve 25 to apply a constant adjustment pressure (30) ) Is included. An adjustment valve 29 is formed at the other end of the adjustment conduit 30, and the pressure supplied from the low pressure conduit 27 and the high pressure conduit 28 is selectively provided by the adjustment valve 29 to the adjustment conduit ( 30).

In particular, the low pressure pipe 27 and the high pressure pipe 28 are connected to the suction port 22 and the discharge port 23, and the other ends thereof are connected to each other so that the low pressure fluid pressure after the compression or the high pressure after the compression is achieved. The fluid pressure is applied to the low pressure line 27 and the high pressure line 28.

In detail, when the adjusting valve 29 is moved upward based on FIG. 1 and the high pressure pipe 28 and the adjusting pipe 30 are connected, high pressure is applied to the adjusting pipe 30. The blocking valve 25 is moved downward based on the drawing. When the blocking valve 25 is moved downward and closed, the fluid that is being compressed by the bypass port 24 is not bypassed. Therefore, many fluids can be compressed without loss of compression capacity.

However, when the adjustment valve 29 is moved downward based on FIG. 1 and the low pressure pipeline 27 and the adjustment pipeline 30 are connected, since the low pressure is applied to the adjustment pipeline 30, the blocking is prevented. The valve 25 is moved upward to open based on FIG. 1. Because the fluid under pressure is at least higher than the pressure in the suction port 22 due to the mutual movement of the scroll members 15 and 16, the blocking valve 25, which is a floating valve, is opened.

In addition, since the bypass port 24 is open when the blocking valve 25 is moved upward and opened, the fluid in the middle of being compressed is passed through the bypass conduit 31 through the suction chamber 13. ) Is bypassed into the inside and discharged. Therefore, the compression capacity is reduced, in which case the compression capacity is reduced by the amount by which the fluid is bypassed.

2 is a bottom view of the non-orbiting scroll member according to the present invention.

Referring to FIG. 2, the non-orbiting scroll member 15 according to the spirit of the present invention includes a non-orbiting helical wrap 17 which is twisted in a spiral form, and a compressed fluid formed at the center of the non-orbiting helical wrap 17. A bypass port 24 is formed to bypass the fluid being in the middle of being compressed as a predetermined hole formed in a space between the center discharge pipe 26 to be discharged and the non-orbiting spiral wrap 17 spaced apart. .

Hereinafter, the operation of the pressure-controlled scroll member according to the present invention will be described in detail.

3 and 5 are enlarged views of part “A” in FIG. 1, and FIGS. 4 and 6 are views for conceptually explaining the state of the scroll member according to the open / closed state of the bypass port. 3 and 4 show a state in which the bypass port is blocked, and FIGS. 5 and 6 show a state in which the bypass port is open.

Referring to FIG. 3, the bypass port 24 is closed. Specifically, a bypass port 24 is formed between the spaced apart spaces of the non-orbiting helical wraps 17 which are opposed, and the bypass port 24 is blocked by a blocking valve 25. At this time, since the high pressure is applied to the control pipe 30, the blocking valve 25 may be strongly blocking the bypass port 24.

Referring to FIG. 4, when the bypass port 24 is blocked, the first suction volume 41, which is a space formed between the non-orbiting spiral wrap 17 and the orbiting spiral wrap 18, is non-orbiting. It can be formed from the first position where the helical wrap 17 and the turning helical wrap 18 meet.

In detail, the formation of the suction volume may include two suction volumes formed by contacting the non-orbiting spiral wrap 17 and the orbiting spiral wrap 18.

One is a first suction space formed by the inner circumferential surface of the non-orbiting helical wrap 17 and the outer circumferential surface of the orbiting helical wrap 18, which can be described as a first suction volume 41 as shown in FIG. .

The other is a second suction space formed by the outer circumferential surface of the non-orbiting helical wrap 17 and the inner circumferential surface of the turning helical wrap 18, which is not shown in the figure, but which the turning helical wrap 18 is pivoted. The inhalation volume produced by P can be considered sufficiently.

The first starting point of the suction space is a point indicated by CS1 (Compress Start 1), and the first starting point of the second suction space is a point indicated by CS2 (Compress Start 2). On the other hand, since the starting points of the first and second suction spaces are not symmetrical, this operating state may be referred to as 'asymmetrical driving'. That is, when the starting points of the first and second suction spaces are formed on one side with respect to the center, it may be referred to as 'asymmetric driving'.

Referring to FIG. 5, the bypass port 24 is open. Specifically, a bypass port 24 is formed between the spaced apart spaces of the non-orbiting helical wraps 17 facing each other, and the bypass port 24 is opened because the blocking valve 25 is moved upward. It is. At this time, since the low pressure is applied to the control conduit 30 as described above, the blocking valve 25 is opened to bypass the compressed fluid to bypass the bypass port 24 and the bypass conduit 31. It is bypassed and discharged into the suction chamber 13 through.

Referring to FIG. 6, in the state where the bypass port 24 is open, the second suction volume 42, which is a space formed between the non-orbiting spiral wrap 17 and the orbiting spiral wrap 18, It is not formed from the first position where the non-orbiting spiral wrap 17 and the orbiting spiral wrap 18 meet. Instead, it can be seen that the second suction volume 42 starts to form from a point past the position where the bypass port 24 is formed.

Referring to the formation of the suction volume in detail, there may be two suction spaces formed by contacting the non-orbiting spiral wrap 17 and the orbiting spiral wrap 18 as described above.

That is, one is a first suction space formed by the inner circumferential surface of the non-orbiting helical wrap 17 and the outer circumferential surface of the orbiting helical wrap 18, which will be described as the first suction volume 41 as shown in FIG. Can be.

The other is a second suction space formed by the outer circumferential surface of the non-orbiting helical wrap 17 and the inner circumferential surface of the orbiting helical wrap 18, which is not shown in the drawing, but which is adapted to the motion of the orbiting helical wrap 18 being turned. It is possible to think sufficiently about the suction space created by

In addition, since the bypass port 24 is formed close to the inner circumferential surface of the non-orbiting spiral wrap 17, the formation of the second suction space is not disturbed. That is, when the second suction space is formed, the bypass port 24 is blocked by the turning spiral wrap 18, so the second suction space is not affected by the presence or absence of the bypass port 24. .

The first starting point of the first suction space at the beginning of compression is the point indicated by CS1, and the first starting point of the second suction space at the beginning of compression is the point indicated by CS2. That is, since CS1 and CS2, which are starting points of the first and second suction spaces, are symmetrical with respect to the center of the scroll members 15 and 16, this operation state may be referred to as 'symmetrical driving'.

On the other hand, in order to complete the 'symmetrical operation' as described above, the formation position of the bypass port 24 is formed at the start of the non-orbiting spiral wrap 17 starting from the center of the non-orbiting scroll member 15. It can be formed on the opposite side.

On the other hand, when the first suction volume 41 shown in FIG. 4 and the second suction volume 42 shown in FIG. 6 are compared, it can be seen that there is a difference in the suction volume.

In detail, the first suction volume 41 is larger than the second suction volume 42, which means that in the asymmetrical driving state, more fluid is compressed. However, the second suction space may be the same between both.

As such, the space between the first suction volume 41 and the second suction volume 42 differs depending on the volume of the suction space generated by the difference between the two depending on the open state or the closed state of the bypass port 24. As a result, the compression capacity may be different.

According to the experiment, when the bypass port 24 is closed and the compression is performed at the total capacity (full load) that can be compressed, the bypass port 24 is opened so that only a part of capacity (part load) is compressed. Compared with the compression, there is an increase in compression capacity of about 18%.

As a result, according to the change of the open / closed state of the bypass port 24, the open / closed state of the blocking valve 25, and the adjustment state of the regulating valve 29, the scroll compressor is in asymmetrical / symmetrical operation. Is switched. In addition, the switching of the driving state may lead to the increase and decrease of the suction volume, resulting in a change in compression capacity.

For example, when the adjustment state of the adjustment valve 29 is moved to the side connecting the high pressure line 28 and the adjustment line 30, the blocking valve 25 is moved downward based on the drawing, and the bypass Port 24 is closed. Then, the scroll compressor is in an asymmetrical operating state because the starting points of the first and second suction spaces are asymmetric. Further, in this case, the compression capacity is increased, so that it may be suitable for, for example, a heating operation state of an air conditioner where a large compression capacity is required.

In the opposite case, when the adjustment state of the adjustment valve 29 is moved to the side connecting the low pressure line 27 and the adjustment line 30, the blocking valve 25 moves upward based on the drawings. Bypass port 24 is opened. In addition, the scroll compressor is in a symmetrical operation state because the starting points of the first and second suction spaces are symmetrical. In addition, in this case, since the compression capacity is reduced, it may be suitable for the cooling operation state of the air conditioner where a small compression capacity is required.

However, the operation state of the air conditioner cooling / heating is only an exemplary description, and may be applied to any use where a difference in compression capacity is required.

7 is a view for explaining another embodiment of the present invention.

Referring to Fig. 7, another embodiment of the present invention is the same as the original embodiment, which has been described in many respects, except that only the connection state starting from the control valve is changed.

In detail, it is the same as that of the original embodiment in which the adjusting conduit 52, the adjusting valve 53, and the high pressure conduit 51 are formed. However, the present embodiment is characterized in that a low-pressure pipeline (see 27 in FIG. 1), which is another connecting pipeline of the regulating valve 53, is not formed.

When the low pressure line 27 is not formed as in the other embodiment of the present invention described above, the control valve 53 is moved downward based on FIG. 7 so that the high pressure is not applied to the control line 52.

In this case, since the internal pressure of the adjusting conduit 52 is the pressure at the point where the bypass port 24 is formed, it is smaller than the intermediate pressure of the fluid under compression of the scroll compressor, so that the blocking valve 25 can be opened. Can be.

To this end, the blocking valve 25 may be a floating valve that can be freely moved inside the predetermined housing.

The present invention as described has the effect that it is possible to bypass the fluid under compression simply by adjusting the adjustment state of the adjustment valve. In particular, the driving force for operating the bypass port is that the low pressure precompression pressure, which is the pressure before being sucked into the scroll compressor, and the high pressure postcompression pressure, which is the pressure after being compressed and discharged by the scroll compressor, are used. There is a characteristic.

Therefore, the structure of the scroll compressor can be further simplified, and the manufacturing cost can be reduced.

 The capacity-controlled scroll compressor according to the present invention has the effect of varying the compression capacity by using the bypass function of the fluid even in a simple configuration in the same rotation speed of the compression motor.

In addition, the present invention has the effect of reducing the manufacturing cost of the scroll compressor by driving the valve by using the fluid pressure before and after being compressed by the scroll compressor, without additional configuration.

Claims (5)

Hermetic shell; A scroll member formed inside the sealable outer shell; A high pressure discharge chamber provided on the discharge side of the scroll member; A discharge port through which the high pressure fluid inside the discharge chamber is discharged; A low pressure suction chamber provided on the suction side of the scroll member; A suction port through which a low pressure fluid flows into the suction chamber; A sealing plate partitioning the discharge chamber and the suction chamber; A bypass port formed through the wall of the compression space inside the scroll member; A bypass conduit having one end connected to the bypass port and the other end connected to the suction chamber; A blocking valve for freely moving up and down inside the bypass port to manipulate the connection state of the bypass pipe in an open / closed state; And In order to adjust the position of the blocking valve to the open or closed position, an adjustment valve for allowing the low pressure fluid pressure of the inlet and the high pressure fluid pressure of the discharge port to be selectively applied to the blocking valve through a predetermined conduit. Included, And said blocking valve is a float valve. delete Hermetic shell; A scroll member formed inside the sealable outer shell; A high pressure discharge chamber provided on the discharge side of the scroll member; A discharge port through which the high pressure fluid inside the discharge chamber is discharged; A low pressure suction chamber provided on the suction side of the scroll member; A suction port through which a low pressure fluid flows into the suction chamber; A sealing plate partitioning the discharge chamber and the suction chamber; A bypass port formed in the compression path of the scroll member; A blocking valve for manipulating the open or closed state of the bypass port; And A bypass adjustment structure for adjusting the open state or closed state of the blocking valve to the pressure of the inlet port and / or the pressure of the outlet port side, And said blocking valve is a float valve. delete The method of claim 3, wherein The bypass adjusting structure includes a control valve for selectively communicating the pressure of the discharge port; And And an adjusting conduit connected at both ends of the regulating valve and the blocking valve so that the fluid pressure selected by the regulating valve is applied to the blocking valve.

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