JP4576306B2 - Scroll compressor and air conditioner - Google Patents

Description

  The present invention relates to a scroll compressor and an air conditioner.

In general, piston-type, rotary-type and scroll-type compressors are known as compressors used in refrigeration cycles such as refrigeration / air-conditioning apparatuses.
As a technique for improving the capacity of the refrigeration cycle using these rotary compressors and scroll compressors, two decompressors are provided between the radiator and the heat absorber, and the refrigerant is expanded in two stages using these decompressors. Gas injection (economizer cycle) is known in which a refrigerant having an intermediate pressure after passing through one decompressor is supplied to a compression stroke of a compressor.

In the scroll compressor described above, if the amount of refrigerant supplied to the pair of compression chambers becomes non-uniform, the pressure in these compression chambers becomes non-uniform, and the balance of the forces acting on the scroll compressor in the compression process is lost. As described above, when the balance of the forces acting on the scroll compressor is lost, there is a problem that vibration of the scroll compressor increases.
For this reason, various techniques for uniformly supplying a refrigerant to a pair of compression chambers of a scroll compressor have been proposed (see, for example, Patent Document 1).
JP-A-7-103152 (page 3-4, FIG. 3 etc.)

In the above-mentioned patent document 1, the structure of the scroll compressor used for a gas injection cycle is shown. Specifically, the end plate of the scroll compressor is formed with a communication path communicating with the pair of compression chambers, and the refrigerant supplied from the outside is supplied to the pair of compression chambers through the communication path. Is disclosed.
According to this structure, the number of the injection flow paths which supply a refrigerant | coolant from the outside can be made into one. Therefore, compared with the case where a plurality of injection flow paths are used, the number of seals at the contact portion between the injection flow path and the scroll compressor housing can be reduced.

  However, in the above-described configuration, it is necessary to form a communication path for distributing the refrigerant to the pair of compression chambers and to form two ports for supplying the refrigerant to the compression chambers. As a result, the configuration of the scroll compressor is complicated, leading to an increase in manufacturing cost.

  The present invention has been made to solve the above-described problems, and provides a scroll compressor and an air conditioner that can improve the capacity by a gas injection cycle and prevent an increase in manufacturing cost. Objective.

In order to achieve the above object, the present invention provides the following means.
The scroll compressor according to the present invention is a scroll compressor that forms a plurality of compression chambers in which a fixed scroll and an orbiting scroll each having a spiral wall body standing on one side face of each end plate are engaged with each other to compress refrigerant. The height of the one side surface of at least one of the fixed scroll and the orbiting scroll is higher at the center side along the vortex of the wall body and lower at the outer end side. A step portion is provided, and an upper edge of one of the fixed scroll and the orbiting scroll is divided into a plurality of portions corresponding to the step portion of the end plate, and the height of the portion is swirled. A stepped portion that is low on the center side and high on the outer end side is provided, and a supply portion that supplies a refrigerant supplied from the outside is provided in the plurality of compression chambers that are compressing the refrigerant. of During the step portion which condensation chamber is separated and including the stepped portion, characterized in that the refrigerant is supplied from the supply unit.

According to the present invention, in order to supply the refrigerant from the supply unit to the plurality of compression chambers while the plurality of compression chambers include the stepped portions and the stepped portions separated from each other, A refrigerant can be supplied to the compression chamber. Therefore, it is not necessary to provide a supply part in several places, and an increase in manufacturing cost can be prevented.
The plurality of compression chambers in contact with the stepped portion and the stepped portion communicate with each other through a gap in which the stepped portion and the stepped portion are separated from each other. Therefore, even if a supply part is provided in one place, a refrigerant | coolant can be supplied to a some compression chamber through the said clearance gap.

  In order to supply the refrigerant to the plurality of compression chambers from the outside while at least the plurality of compression chambers communicate with each other through the gap, the refrigerant is supplied only while the plurality of compression chambers are independent from each other. In comparison, since the refrigerant can be supplied to the compression chamber having a larger volume, the amount of refrigerant to be supplied can be increased. Therefore, the amount of refrigerant per unit time discharged by the scroll compressor can be increased, and for example, the refrigerating capacity of an air conditioner using the scroll compressor of the present invention can be improved.

  In the above invention, the supply part is a through hole provided in at least one end plate of the fixed scroll and the orbiting scroll, and the through hole is at least the step part in which the plurality of compression chambers are separated from each other. And it is desirable to be provided in the position which communicates with these compression chambers while including the stepped part.

  According to the present invention, the supply portion is a through hole provided in the end plate, and the supply portion is provided at a position communicating with the plurality of compression chambers while the plurality of compression chambers include the stepped portion and the stepped portion separated from each other. Therefore, the refrigerant can be supplied to the plurality of compression chambers through the through hole provided at one place.

  In the said invention, it is desirable that the said supply part is provided in the contact part with the said stepped part in the said level | step difference part.

According to the present invention, since the supply unit is provided at the contact portion of the stepped portion with the stepped portion, the period during which the refrigerant can be supplied compared to the case where the supply unit is provided on one side surface of the end plate. Can be lengthened.
Since the contact between the stepped portion and the stepped portion in the contact portion is a line contact, and the contact between the end plate and the wall body on one side surface is a surface contact, the wall body is provided by providing the supply portion in the contact portion. This is because the period during which the refrigerant supply is hindered is shortened.

  In the above invention, a seal member that contacts the end plate is located in the upper edge of the wall body on the center side of the vortex from the stepped portion and on the outer end side of the stepped portion. It is desirable that the supply portion is provided in a region where the seal member in the end plate is not slid.

  According to the present invention, since the supply unit is provided in a region where the seal member does not slide, it is possible to prevent the seal member from being damaged by the supply unit. By preventing the seal member from being damaged, it is possible to prevent refrigerant leakage between adjacent compression chambers with different pressures across the wall, and to prevent a decrease in the capacity of the scroll compressor.

  In the above-mentioned invention, it has a control part which controls supply of the refrigerant from the supply part to the plurality of compression chambers, and the control part is while the step part and the stepped part are separated. It is desirable to control the refrigerant to be supplied from the supply unit.

  According to the present invention, since the control unit controls the refrigerant to be supplied from the supply unit while the stepped portion and the stepped portion are separated from each other, the plurality of compression chambers are independent. The refrigerant is not supplied to only one compression chamber. Therefore, the pressure of each of the plurality of compression chambers is kept uniform, and the increase in vibration of the scroll compressor can be prevented.

  The air conditioner of the present invention radiates the heat of the scroll compressor of the present invention, an oil separator that separates lubricating oil from the refrigerant compressed by the scroll compressor, and the refrigerant compressed by the scroll compressor. And a high pressure side decompression unit that depressurizes the pressure of the radiated refrigerant, a low pressure side decompression unit that further decompresses the decompressed refrigerant, and an endotherm that absorbs heat in the refrigerant decompressed by the low pressure side decompression unit And the supply of the scroll compressor is supplied with the refrigerant decompressed by the high pressure side decompression unit and the lubricating oil separated by the oil separator. To do.

  According to the present invention, the lubricating oil separated by the oil separator can be returned to the compression chamber of the scroll compressor via the supply unit. By returning the lubricating oil to the compression chamber, refrigerant leakage from the compression chamber can be prevented, and the capability of the scroll compressor and the capability of the air conditioner can be improved.

  According to the scroll compressor and the air conditioner of the present invention, the refrigerant is supplied from the supply unit to the plurality of compression chambers while the plurality of compression chambers include the stepped portions and the stepped portions separated from each other. The supplied supply unit can supply the refrigerant to the plurality of compression chambers. Therefore, there is no need to provide a plurality of supply sections, and the effect of preventing an increase in manufacturing cost can be achieved.

  In order to supply the refrigerant to the plurality of compression chambers from the outside while at least the plurality of compression chambers communicate with each other through the gap, the refrigerant is supplied only while the plurality of compression chambers are independent from each other. In comparison, since the refrigerant can be supplied to the compression chamber having a larger volume, the amount of refrigerant to be supplied can be increased. Therefore, the amount of refrigerant per unit time discharged by the scroll compressor can be increased, and for example, the effect of improving the refrigeration capacity of the air conditioner using the scroll compressor of the present invention can be achieved.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram illustrating an air conditioner according to the present embodiment.
As shown in FIG. 1, the air conditioner 1 includes a scroll compressor 3 that compresses a refrigerant, a capacitor (heat radiator) 5 that radiates heat of the compressed refrigerant, and a first pressure that reduces the pressure of the radiated refrigerant. 1 expansion valve (high pressure side decompression unit) 7, receiver 9 for gas-liquid separation of the decompressed refrigerant, second expansion valve (low pressure side decompression unit) 11 for further decompressing the liquid refrigerant, and decompressed liquid refrigerant An evaporator (heat absorber) 13 that absorbs heat is schematically configured.
Between the receiver 9 and the scroll compressor 3, an injection flow channel (supply unit) 17 that supplies the gas refrigerant separated in the receiver 9 to the scroll compressor 3 is disposed.

FIG. 2 is a cross-sectional view illustrating the configuration of the scroll compressor of FIG.
As shown in FIG. 2, the scroll compressor 3 is roughly composed of a housing 21 that is a sealed container, a fixed scroll 23 that compresses a refrigerant and a orbiting scroll 25, and a motor 27 that rotationally drives the orbiting scroll 25. Yes.
The housing 21 includes a discharge cover 29 that separates the inside of the housing 21 into a high pressure chamber HR and a low pressure chamber LR, a suction pipe 31 that guides the refrigerant from the evaporator 13 to the low pressure chamber LR, and a refrigerant that leads from the high pressure chamber HR to the condenser 5. A discharge pipe 33 and a frame 35 that supports the fixed scroll 23 and the orbiting scroll 25 are provided.

Between the orbiting scroll 25 and the motor 27, a rotating shaft 37 that transmits the rotational force of the motor 27 to the orbiting scroll is provided.
An Oldham ring 39 that prevents the orbiting scroll 25 from rotating is provided between the frame 35 and the orbiting scroll 25.

FIG. 3 is a perspective view illustrating the configuration of the fixed scroll and the orbiting scroll of FIG.
As shown in FIG. 3A, the fixed scroll 23 has a configuration in which a spiral wall body 23b is erected on one side surface of the end plate 23a. As shown in FIG. 3B, the orbiting scroll 25 has a configuration in which a spiral wall body 25b is erected on one side surface of the end plate 25a, like the fixed scroll 23. The wall body 23b on the fixed scroll 23 side has substantially the same shape. The orbiting scroll 25 is assembled with the wall bodies 23b and 25b meshed with each other in a state where they are eccentric with respect to the fixed scroll 23 by the revolving orbiting radius and shifted in phase by 180 degrees.

In this case, as shown in FIG. 2, the orbiting scroll 25 is provided with respect to the fixed scroll 23 by the action of the eccentric pin 37 a and the Oldham ring 39 provided at the upper end of the rotating shaft 37 driven by the motor 27. It is designed to perform a revolving motion.
On the other hand, the fixed scroll 23 is fixed to the housing 21, and a compressed fluid discharge port 32 is provided at the center of the back surface of the end plate 23a.

  The end plate 23a of the fixed scroll 23 has a stepped portion 42 formed on one side where the wall body 23b is erected so as to be higher on the center side along the vortex direction of the wall body 23b and lower on the outer end side. I have. Similarly to the end plate 23a of the fixed scroll 23, the end plate 25a on the side of the orbiting scroll 25 has a side surface on which the wall body 25b is erected and is higher at the center side along the vortex direction of the wall body 25b. The step part 43 formed so that it may become low is provided.

The bottom surface of the end plate 23a is divided into two parts, a shallow bottom surface 23f provided on the center side and a deep bottom surface 23g provided on the outer end side by forming the step portion 42. It has been. Between adjacent bottom surfaces 23f and 23g, a stepped portion 42 is formed, and there is a connecting wall surface 23h that connects the bottom surfaces 23f and 23g and stands vertically.
Similarly to the end plate 23a described above, the bottom surface of the end plate 25a is formed with the stepped portion 43, so that the bottom bottom surface 25f provided on the center side and the bottom bottom surface provided on the outer end side are deep. It is divided into two parts of 25g. Between adjacent bottom surfaces 25f and 25g, a stepped portion 43 is formed, and there is a connecting wall surface 25h that connects the bottom surfaces 25f and 25g and stands vertically.

  The wall 23b on the fixed scroll 23 side corresponds to the stepped portion 43 of the orbiting scroll 25, the upper edge of the spiral is divided into two parts, and is lower on the vortex center side and on the outer end side. The stepped portion 44 is high. Similarly to the wall body 23b, the wall body 25b on the side of the orbiting scroll 25 corresponds to the stepped portion 42 of the fixed scroll 23, the upper edge of the spiral is divided into two parts, and the outer side of the center part of the vortex is lowered lower. A high stepped portion 45 is formed on the end side.

  Specifically, the upper edge of the wall body 23b is divided into two parts, a lower upper edge 23c provided closer to the center and a higher upper edge 23d provided closer to the outer end. A connecting edge 23e perpendicular to the swiveling surface is formed between the edges 23c and 23d. Similarly to the wall body 23b described above, the upper edge of the wall body 25b is also divided into two parts: a lower upper edge 25c provided near the center and a higher upper edge 25d provided near the outer end. Between the adjacent upper edges 25c and 25d, a connecting edge 25e perpendicular to the swivel surface is formed by connecting the two.

When the wall 23b is viewed from the direction of the orbiting scroll 25, the connecting edge 23e has a semicircular shape that is smoothly continuous with both inner and outer side surfaces of the wall 23b and has a diameter equal to the wall thickness of the wall 23b. Similarly to the connecting edge 23e, the connecting edge 25e has a semicircular shape that smoothly continues to both the inner and outer side surfaces of the wall body 25b and has a diameter equal to the wall thickness of the wall body 25b.
Further, the connecting wall surface 23h has an arc that matches the envelope drawn by the connecting edge 25e with the turning of the orbiting scroll when the end plate 23a is viewed from the turning axis direction. Similarly to the connection wall surface 23h, the connection wall surface 25h has an arc that matches the envelope drawn by the connection edge 23e.

  The wall body 23b of the fixed scroll 23 is provided with chip seals 24a and 24b divided into two near the connection edge 23e on the upper edges 23c and 23d. Similarly, the wall body 25b of the orbiting scroll 25 is provided with tip seals 26a and 26b divided into two near the connecting edge 25e on the upper edges 25c and 25d. These tip seals leak gas fluid compressed by sealing the tip seal gap formed between the upper edge (tooth tip) and the bottom surface (tooth bottom) between the orbiting scroll 25 and the fixed scroll 23. Is to minimize.

That is, when the orbiting scroll 25 is assembled to the fixed scroll 23, the tip seal 26b provided at the lower upper edge 25c contacts the shallow bottom surface 23f, and the tip seal 26a provided at the upper upper edge 25d is the bottom bottom. Contact 23g. At the same time, the tip seal 24a provided on the lower upper edge 23c contacts the shallow bottom surface 25f, and the tip seal 24b provided on the upper upper edge 23d contacts the deep bottom surface 25g.
As a result, a plurality of compression chambers C defined by end plates 23a and 25a and wall bodies 23b and 25b facing each other are formed between the scrolls 23 and 25.
In FIG. 3, the fixed scroll 23 is shown upside down in order to show the stepped shape of the fixed scroll 23.

  Further, as shown in FIG. 3A, an injection port (supply part, through hole) 17 p connected to the injection flow path 17 is formed on the bottom surface of the end plate 23 a of the fixed scroll 23. The injection port 17p is a deep bottom surface 23g of the bottom surface, and is formed in a region near the connection wall surface 23h of the step portion 42.

Next, the effect | action of the air conditioner 1 mentioned above is demonstrated.
The refrigerant compressed to a high pressure by the scroll compressor 3 is discharged toward the condenser 5 as shown in FIG. The refrigerant that has flowed into the condenser 5 releases its heat to the outside, condenses, and flows out toward the first expansion valve 7. The refrigerant is depressurized by the first expansion valve 7, becomes an intermediate pressure refrigerant, and flows into the receiver 9. The refrigerant is separated into liquid refrigerant and gas refrigerant in the receiver 9, and the liquid refrigerant flows out toward the second expansion valve 11. The liquid refrigerant is decompressed by the second expansion valve 11 to become a low-pressure refrigerant, and flows into the evaporator 13. The low-pressure refrigerant takes heat from the outside air in the evaporator 13, evaporates to become a gas refrigerant, flows into the scroll compressor 3, and is compressed again.

On the other hand, the gas refrigerant separated in the receiver 9 flows into the scroll compressor 3 through the injection flow path 17. The refrigerant flowing into the scroll compressor 3 is compressed again.
The refrigerant compressed by the scroll compressor 3 again is discharged to the condenser 5 and repeats the above cycle.

Next, the operation of the scroll compressor 3 will be described.
FIG. 4A to FIG. 11O are diagrams for explaining the movement of the fixed scroll and the orbiting scroll of FIG. 2 and the change of the compression chamber. FIG. 4A to FIG. 11O are perspective views of the fixed scroll and the orbiting scroll viewed from the fixed scroll side. FIG. 12 is a graph showing a change in the volume of the compression chamber to which the refrigerant is supplied from the injection ports from FIG. 4 (a) to FIG. 11 (o).

FIG. 4A shows the relative positions of the fixed scroll 23 and the turning scroll 25 at a certain turning angle. The compression chamber C is located in the vicinity of the outer ends of the fixed scroll 23 and the orbiting scroll 25 and has not yet been closed with respect to the low pressure chamber LR (see FIG. 2).
Further, the step portion 42 of the fixed scroll 23 and the stepped portion 45 of the orbiting scroll 25 are separated from each other, and the step portion 43 of the orbiting scroll 25 and the stepped portion 44 of the fixed scroll 23 are separated from each other.

Thereafter, when the turning angle advances, as shown in FIGS. 4 (b) and 5 (c), the compression chamber C is located on the center side along the vortex direction of the wall bodies 23 b and 25 b in the scrolls 23 and 25. Move to.
5C, the stepped portion 42 and the stepped portion 45, and the stepped portion 43 and the stepped portion 44 are in contact with each other.

When the turning angle further advances, as shown in FIGS. 5 (d) and 6 (e), the compression chamber C is located on the center side along the vortex direction of the wall bodies 23b and 25b in the scrolls 23 and 25, respectively. Move to.
When the scroll outermost peripheral wall surface comes into contact with the mating scroll wall surface, the compression chamber C is closed with respect to the low pressure chamber LR, and becomes a pair of independent spaces C1 and C2. The volume of the compression chamber C1 at this time is D in FIG. Thereafter, as the turning angle advances, the volume of the compression chamber C (C1, C2) decreases as shown in FIG. 12, and the refrigerant in the compression chamber is compressed.
Immediately after this, the central side end of one compression chamber C1 communicates with the injection port 17p, and the intermediate-pressure refrigerant decompressed by the first expansion valve 7 passes through the injection flow path 17 to the compression chamber C1. (E point in FIG. 12).

When the compression further proceeds, as shown in FIGS. 6 (f), 7 (g), and (h), the compression chambers C1 and C2 follow the vortex directions of the wall bodies 23b and 25b in the scrolls 23 and 25, respectively. Move to the center.
During this time, since the stepped portion 42 and the stepped portion 45 and the stepped portion 43 and the stepped portion 44 are kept in contact with each other, the compression chambers C1 and C2 are isolated as independent spaces. Further, the intermediate pressure refrigerant is continuously supplied to the compression port C1 to the injection port 17p.

When the compression is performed up to the position of FIG. 8I, the contact between the stepped portion 42 and the stepped portion 45 and the stepped portion 43 and the stepped portion 44 is finished.
Thereafter, the stepped portion 42 and the stepped portion 45, and the stepped portion 43 and the stepped portion 44 are separated from each other. Then, the compression chambers C1 and C2 that are adjacent to each other with the wall body 23b of the fixed scroll 23 and the wall body 25b of the orbiting scroll 25 interposed therebetween are the stepped portion 42 and the stepped portion 45, and the stepped portion 43 and the stepped portion 44. Are communicated via the separated portion (point I in FIG. 12).

When the compression further proceeds, as shown in FIGS. 8 (j), 9 (k), (l), 10 (m), and (n), the compression chambers C1 and C2 communicated with each other have scrolls 23 and 25, respectively. It moves to the center side along the vortex direction of the wall bodies 23b and 25b.
During this time, the intermediate-pressure refrigerant supplied from the injection port 17p to the compression chamber C1 passes through the stepped portion 42 and the stepped portion 45, and the separation portion between the stepped portion 43 and the stepped portion 44, thereby compressing the chambers C1 and C2. Circulate freely inside. Therefore, the pressure in the compression chambers C1 and C2 is kept uniform.

When compressed to the position of FIG. 11 (o), the stepped portion 42 and the stepped portion 45, and the stepped portion 43 and the stepped portion 44 come into contact again, and the compression chambers C1 and C2 again become independent spaces (FIG. 11). 12 O points).
Further, immediately before this, the wall body 25b of the orbiting scroll 25 moves on the injection port 17p. Therefore, the communication with the compression chamber C1 is closed, and the compression chamber C1 further moves toward the center in the vortex direction, so that the supply of the intermediate pressure refrigerant to the compression chamber C1 is completed (point M in FIG. 12).
Thereafter, as the swirl angle advances, the compression chambers C1, C2 move toward the center in the vortex direction, and finally communicate with the discharge port 32 to discharge the compressed refrigerant toward the high-pressure chamber HR (see FIG. 2). .

According to the above-described configuration, the compression chambers C1 and C2 are spaced apart from each other through the gap between the stepped portion 42 and the stepped portion 45 and the stepped portion 43 and the stepped portion 44. The intermediate pressure refrigerant decompressed by the first expansion valve 7 can be supplied from the injection port 17p provided to the compression chamber C1. That is, since the intermediate pressure refrigerant supplied from the injection port 17p is also supplied to the compression chamber C2 through the compression chamber C1 and the gap, the pressure balance between the compression chambers C1 and C2 can be achieved.
As a result, an increase in vibration due to the collapse of the pressure balance between the compression chambers C1 and C2 in the scroll compressor 3 can be prevented.

Even while the compression parts C1 and C2 communicate with each other through the gap, the refrigerant is supplied only while the compression parts C1 and C2 are independent from each other in order to supply the intermediate pressure refrigerant from the injection port 17p. Compared to the case, since the refrigerant can be supplied to the compression units C1 and C2 having larger volumes, the amount of refrigerant to be supplied can be increased.
Therefore, the amount of refrigerant per unit time discharged by the scroll compressor 3 can be increased, and the refrigeration capacity of the air conditioner 1 can be improved.

FIG. 13 is a partially enlarged view for explaining another formation position of the injection port of FIG. 3.
In addition, the injection port 17p may be formed in the area | region of the connection wall surface 23h of the level | step-difference part 42 in the bottom face 23g of the fixed scroll 23, as shown to Fig.3 (a), as shown in FIG. The bottom surface 23f of the fixed scroll 23 may be formed in a region near the connection wall surface 23h.
Furthermore, the injection port 17p may be formed in a region away from the connection wall surface 23h on the bottom surface 23f. However, it is necessary to form the injection port 17p at a position where the injection port 17p and the compression chamber C1 communicate with each other at least while the compression chambers C1 and C2 communicate with each other.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the air conditioner of the present embodiment is the same as that of the first embodiment, but the peripheral configuration of the injection port of the scroll compressor is different from that of the first embodiment. Therefore, in the present embodiment, only the peripheral configuration of the injection port will be described with reference to FIGS. 14 and 15, and description of other components and the like will be omitted.
FIG. 14 is a partially enlarged view illustrating the configuration of the scroll compressor of the air conditioner according to the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 14, the scroll compressor 103 in the air conditioner 101 includes a housing 21 that is a sealed container, a fixed scroll 23 that compresses a refrigerant, a turning scroll 125, and a frame that supports the fixed scroll 23 and the turning scroll 125. 135.

The scroll compressor 103 is connected to an injection flow channel 117 that supplies the intermediate pressure refrigerant separated from the gas and liquid in the receiver 9 (see FIG. 1) to the scroll compressor 103. The injection flow path 117 is configured to supply intermediate pressure refrigerant from the orbiting scroll 125 to the compression chamber C via the housing 21 and the frame 135.
The injection flow path 117 is provided with a valve structure (control unit) 119 for controlling the flow of the intermediate pressure refrigerant between the frame 135 and the orbiting scroll 125.

The valve structure 119 includes a groove portion 120 formed in the frame 135 and an injection port (feeding portion, through hole) 121 that is a through hole formed in the orbiting scroll 125. The groove 120 is formed in a shape that communicates with the injection port 121 only when the fixed scroll 23 and the orbiting scroll 125 are in a predetermined positional relationship.
Specifically, the compression chamber C1 communicating with the injection port 121 communicates with the other compression chamber C2 via the gap between the stepped portion 42 and the stepped portion 45, and the stepped portion 43 and the stepped portion 44. The shape of the groove part 120 is determined so that the groove part 120 and the injection port 121 communicate with each other only between them.

Next, the effect | action of the air conditioner 101 mentioned above and the effect | action of the scroll compressor 103 are demonstrated.
Since the operation of the air conditioner 101 is the same as that of the first embodiment, the description thereof is omitted.

  Since the movements of the fixed scroll 23 and the orbiting scroll 125 and the volume changes of the compression chambers C1, C2 in the scroll compressor 103 are the same as those in the first embodiment, the description thereof is omitted.

Here, the volume change of the compression chambers C <b> 1 and C <b> 2 and the supply timing of the intermediate pressure refrigerant from the injection port 121 in the scroll compressor 103 will be described.
FIG. 15 is a graph showing a change in volume of the compression chamber to which the refrigerant is supplied from the through hole of FIG.
From the time when the compression chamber C1 is closed (point D in FIG. 15) until the compression chamber C1 and the injection port 121 communicate with each other (point E in FIG. 15), as in the first embodiment, the injection port 121 The intermediate pressure refrigerant is not supplied to the compression chamber C1.

After the compression chamber C1 and the injection port 121 communicate with each other, the stepped portion 42 and the stepped portion 45, and the stepped portion 43 and the stepped portion 44 are separated from each other, and the compression chamber C1 is connected to another compression chamber through the gap. The groove 120 of the valve structure 119 and the injection port 121 are not in communication until communicating with C2 (point I in FIG. 15) (see FIG. 14). Therefore, the intermediate pressure refrigerant is not supplied from the injection port 121 to the compression chamber C1 from the point E to the point I in FIG.
After the compression chamber C1 and the compression chamber C2 communicate with each other, the groove 120 and the injection port 121 communicate with each other (see FIG. 14), and intermediate pressure refrigerant is supplied from the injection port 121 to the compression chamber C1 and the compression chamber C2. .

Thereafter, when the stepped portion 42 and the stepped portion 45, and the stepped portion 43 and the stepped portion 44 come into contact again, and the compression chambers C 1 and C 2 become independent spaces again (point O in FIG. 15), the valve structure 119. The communication between the groove 120 and the injection port 121 is interrupted (see FIG. 14).
Thereafter, as the turning angle advances, the compression chambers C1 and C2 move toward the center in the vortex direction, and finally communicate with the discharge port 32 to discharge the compressed refrigerant toward the high-pressure chamber HR (see FIG. 2). .

  According to the above configuration, the valve structure 119 controls the intermediate pressure refrigerant to be supplied from the injection port 121 only while the compression chambers C1 and C2 are in communication. Therefore, while the compression chambers C1 and C2 are independent, the intermediate pressure refrigerant is not supplied, the pressure in the compression chambers C1 and C2 can be kept uniform, and the vibration of the scroll compressor 103 is increased. Can be prevented.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the air conditioner of this embodiment is the same as that of the first embodiment, but the injection port configuration of the scroll compressor is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the injection port will be described using FIG. 16, and description of other components and the like will be omitted.
FIG. 16 is a partially enlarged view illustrating the configuration of the scroll compressor of the air conditioner according to the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 16, the scroll compressor 303 in the air conditioner 301 includes a fixed scroll 323 and a turning scroll 25 that compress the refrigerant.
The connection wall surface (contact part) 323h of the fixed scroll 323 has an injection port (supply part, through hole) that is a through hole for supplying the intermediate pressure refrigerant supplied from the injection flow path 17 (see FIG. 1) to the compression chamber C. ) 317p is formed.
The injection port 317p is formed substantially parallel to the wall body 23b and the bottom surfaces 23f and 23g, and is formed at a position close to the wall body 23b side.

Next, the effect | action of the air conditioner 301 mentioned above and the effect | action of the scroll compressor 303 are demonstrated.
Since the operation of the air conditioner 301 is the same as that of the first embodiment, the description thereof is omitted.

  The movement of the fixed scroll 323 and the orbiting scroll 25 in the scroll compressor 303, the volume change of the compression chambers C1 and C2, and the supply timing of the intermediate-pressure refrigerant from the injection port 317p are also the same as those in the first embodiment. Since it is the same, the description is abbreviate | omitted.

Here, opening and closing of the injection port 317p by the wall body 25b, which is a characteristic part of the present embodiment, will be described.
As shown in FIG. 16, the injection port 317 p is formed on the connection wall surface 323 h and is opened and closed by a connection edge 25 e (see FIG. 3B) of the wall body 25 b in the orbiting scroll 25.

According to said structure, since the injection port 317p is provided in the connection wall surface 323h, compared with the case where the injection port 317p is provided in the bottom face (for example, bottom face 23f and bottom face 23g) of the end plate 23a, The period during which the refrigerant can be supplied can be lengthened.
Since the contact with the connection edge 25e on the connection wall surface 323h is a line contact and the contact with the wall body 25b on the bottom surface of the end plate 23a is a surface contact, the wall body can be obtained by providing the injection port 317p on the connection wall surface 323h. This is because the period during which the refrigerant supply is hindered by 25b is shortened.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the air conditioner of this embodiment is the same as that of the first embodiment, but the injection port configuration of the scroll compressor is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the injection port will be described with reference to FIG.
FIG. 17 is a partially enlarged view illustrating the configuration of the scroll compressor of the air conditioner according to the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 17, the scroll compressor 403 in the air conditioner 401 includes a fixed scroll 423 and a turning scroll 25 that compress the refrigerant.
The bottom surface 23f of the fixed scroll 423 is formed with an injection port (supply portion, through hole) 417p which is a through hole for supplying the intermediate pressure refrigerant supplied from the injection flow path 17 (see FIG. 1) to the compression chamber C. ing.
Specifically, the injection port 417p is formed in a region L in the vicinity of the step portion 42 of the bottom surface 23f and in a range L in which the tip seal 26b (see FIG. 3B) of the orbiting scroll 25 does not slide. .

Next, the effect | action of the air conditioner 401 mentioned above and the effect | action of the scroll compressor 403 are demonstrated.
Since the operation of the air conditioner 401 is the same as that of the first embodiment, the description thereof is omitted.

  The movement of the fixed scroll 423 and the orbiting scroll 25 in the scroll compressor 403, the volume change of the compression chambers C1 and C2, and the supply timing of the intermediate pressure refrigerant from the injection port 417p are also the same as in the first embodiment. Since it is the same, the description is abbreviate | omitted.

  According to the above configuration, since the injection port 417p is provided in a region where the tip seal 26b does not slide, the tip seal 26b can be prevented from being damaged due to contact with the injection port 417p. By preventing breakage of the tip seal 26b, it is possible to prevent refrigerant leakage between the compression chambers C1 and C2 having different pressures adjacent to each other with the wall body 25b interposed therebetween, and to prevent a decrease in the capacity of the scroll compressor 403.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the air conditioner of the present embodiment is the same as that of the first embodiment, but is different from the first embodiment in the configuration of the injection flow path for supplying intermediate pressure refrigerant to the scroll compressor. . Therefore, in the present embodiment, only the periphery of the injection flow path will be described using FIG. 18, and description of other components and the like will be omitted.
FIG. 18 is a schematic diagram illustrating an air conditioner according to the present embodiment.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 18, the air conditioner 501 includes a scroll compressor 3 that compresses a refrigerant, an oil separator (oil separator) 503 that separates lubricating oil from the compressed refrigerant, and a refrigerant from which the lubricating oil is separated. A capacitor 5 that radiates the heat of the heat, a first expansion valve 7 that depressurizes the pressure of the radiated refrigerant, a receiver 9 that gas-liquid separates the depressurized refrigerant, and a second expansion valve 11 that further depressurizes the liquid refrigerant. , And an evaporator 13 that absorbs heat by the decompressed liquid refrigerant.

Between the receiver 9 and the scroll compressor 3, an injection flow channel (supply unit) 517 that supplies the gas refrigerant separated in the receiver 9 to the scroll compressor 3 is disposed.
Between the oil separator 503 and the injection flow channel 517, an oil flow channel 519 for supplying the lubricating oil separated by the oil separator 503 to the injection flow channel 517 is disposed. A restriction 521 is provided in the oil flow path 519, and the pressure difference between the oil separator 503 and the injection flow path 517 is adjusted by the restriction 521.

Next, the operation of the air conditioner 501 described above will be described.
The refrigerant compressed to high pressure by the scroll compressor 3 is discharged toward the oil separator 503 as shown in FIG. The refrigerant flowing into the oil separator 503 is separated into the lubricating oil and refrigerant of the scroll compressor 3, and the separated refrigerant is discharged toward the capacitor 5.

  The refrigerant that has flowed into the condenser 5 releases its heat to the outside, condenses, and flows out toward the first expansion valve 7. The refrigerant is depressurized by the first expansion valve 7, becomes an intermediate pressure refrigerant, and flows into the receiver 9. The refrigerant is separated into liquid refrigerant and gas refrigerant in the receiver 9, and the liquid refrigerant flows out toward the second expansion valve 11. The liquid refrigerant is decompressed by the second expansion valve 11 to become a low-pressure refrigerant, and flows into the evaporator 13. The low-pressure refrigerant takes heat from the outside air in the evaporator 13, evaporates to become a gas refrigerant, flows into the scroll compressor 3, and is compressed again.

On the other hand, the gas refrigerant separated in the receiver 9 flows into the scroll compressor 3 via the injection flow path 517. The refrigerant flowing into the scroll compressor 3 is compressed again.
The lubricating oil separated in the oil separator 503 is supplied to the injection flow channel 517 through the oil flow channel 519. The lubricating oil supplied to the injection flow path 517 flows into the scroll compressor 3 together with the refrigerant.
The refrigerant compressed by the scroll compressor 3 again is discharged to the condenser 5 and repeats the above cycle.

  According to the above configuration, the lubricating oil separated by the oil separator 503 can be returned to the compression chambers C1 and C2 of the scroll compressor 3 via the injection port 17p. By returning the lubricating oil to the compression chambers C1 and C2, the sealing performance can be improved, the refrigerant leakage from the compression chambers C1 and C2 can be prevented, the capacity of the scroll compressor 3 can be improved, and the capacity of the air conditioner 501 can be improved. Can be planned.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
In the above embodiment, the present invention has been described as an air conditioner. Specifically, the present invention can be applied to devices to which various other air conditioners such as a refrigerator and an air conditioner are applied.

It is the schematic explaining the air conditioner which concerns on the 1st Embodiment of this invention. It is sectional drawing explaining the structure of the scroll compressor of FIG. It is a perspective view explaining the structure of the fixed scroll and turning scroll of FIG. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a figure explaining the motion of the fixed scroll of FIG. 2, and a turning scroll, and the change of a compression chamber. It is a graph which shows the volume change of the compression chamber to which a refrigerant | coolant is supplied from the injection port of FIGS. It is the elements on larger scale explaining the other formation position of the injection port of FIG. It is the elements on larger scale explaining the structure of the scroll compressor of the air conditioner in the 2nd Embodiment of this invention. It is a graph which shows the volume change of the compression chamber to which a refrigerant | coolant is supplied from the through-hole of FIG. It is the elements on larger scale explaining the structure of the scroll compressor of the air conditioner in the 3rd Embodiment of this invention. It is the elements on larger scale explaining the structure of the scroll compressor of the air conditioner in the 4th Embodiment of this invention. It is the schematic explaining the air conditioner in the 5th Embodiment of this invention.

Explanation of symbols

1, 101, 301, 401, 501 Air conditioner 3, 103, 303, 403 Scroll compressor 5 Capacitor (heatsink)
7 First expansion valve (high pressure side pressure reducing part)
11 Second expansion valve (low pressure side pressure reducing part)
13 Evaporator (heat absorber)
17,517 Injection channel (supply section)
17p, 121, 317p, 417p Injection port (supply part, through hole)
23,323,423 Fixed scroll 23a, 25a End plate 23b, 25b Wall body 25,125 Orbiting scroll 42,43 Stepped portion 44,45 Stepped portion 119 Valve structure (control unit)
323h Connecting wall surface (contact part)
503 Oil separator (oil separator)
C, C1, C2 compression chamber

Claims (6)

The fixed scroll and the orbiting scroll in which a spiral wall body is erected on one side surface of each end plate are scroll compressors that form a plurality of compression chambers that compress refrigerant by meshing with each other,
The one side surface of at least one of the fixed scroll and the orbiting scroll is provided with a step portion whose height is higher at the center side along the vortex of the wall body and lower at the outer end side. With
The upper edge of the other scroll body of the fixed scroll and the orbiting scroll is divided into a plurality of parts corresponding to the stepped part of the end plate, and the height of the part is low on the center side of the vortex. A stepped portion that is higher on the end side is provided,
A supply unit for supplying a refrigerant supplied from the outside is provided in the plurality of compression chambers that compress the refrigerant,
A scroll compressor, wherein the refrigerant is supplied from at least the step portion and the stepped portion in which the plurality of compression chambers are separated from each other. The supply part is a through-hole provided in an end plate of at least one of the fixed scroll and the orbiting scroll;
2. The through hole is provided at a position communicating with the plurality of compression chambers while including at least the stepped portion and the stepped portion separated from each other by the plurality of compression chambers. Scroll compressor.   The scroll compressor according to claim 1, wherein the supply unit is provided in a contact portion of the stepped portion with the stepped portion. In the upper edge of the wall body, a region on the central portion side of the vortex from the stepped portion, and a region on the outer end side from the stepped portion are provided with a seal member that contacts the end plate,
The scroll compressor according to claim 1, wherein the supply unit is provided in a region of the end plate where the seal member does not slide. A control unit that controls supply of the refrigerant from the supply unit to the plurality of compression chambers;
5. The control unit according to claim 1, wherein the control unit controls the refrigerant to be supplied from the supply unit while the stepped unit and the stepped unit are separated from each other. Scroll compressor. A scroll compressor according to any one of claims 1 to 5,
An oil separator for separating the lubricating oil from the refrigerant compressed by the scroll compressor;
A radiator that dissipates heat of the refrigerant compressed by the scroll compressor;
A high-pressure side decompression section that decompresses the pressure of the radiated refrigerant;
A low-pressure side decompression section for further decompressing the decompressed refrigerant;
A heat absorber that absorbs heat in the refrigerant decompressed by the low pressure side decompression unit,
The air conditioner characterized in that the supply unit of the scroll compressor is supplied with the refrigerant decompressed by the high-pressure side decompression unit and the lubricating oil separated by the oil separator.

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