JP2016089650A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor easy in processing a suction pipe and reducing a thickness of a separator, so that generation of vibration and noise of the compressor can be suppressed.SOLUTION: A rotary compressor includes a housing 11, upper and lower two cylinders 20A, 20B disposed in the housing 11, and a suction pipe 40 connected to the housing 11 and supplying a refrigerant into the cylinders 20A, 20B. The upper cylinder 20A of the cylinders 20A, 20B has a first cutout portion 2A at one face side, and the lower cylinder 20B has a second cutout portion 2B at the other face side, so that the cross-sectional shape of the suction pipe 40 is configured in joining the first cutout portion 2A and the second cutout portion 2B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary compressor used in a refrigeration apparatus or the like.

  2. Description of the Related Art Conventionally, as a rotary compressor used in an air conditioner, a refrigerator, or the like, a cylinder and a piston rotor provided in the cylinder and provided with eccentric rotation by an eccentric amount of an eccentric shaft portion are provided. The structure of partitioning by is known. In such a rotary compressor, a suction pipe is connected to each of the upper and lower cylinders, and the upper and lower suction pipes are fixed to the housing of the rotary compressor by welding.

In addition, as a rotary compressor, for example, a configuration in which a single suction pipe is connected to a separator as shown in Patent Document 1, and the upper and lower cylinders can be made thin so that optimum suction can be obtained. There is.
FIG. 10 shows the configuration of the rotary compressor 100 of Patent Document 1. In the rotary compressor 100 shown in FIG. 10, a separator 105 is provided with a suction pipe 104 that communicates with the suction ports 103 of upper and lower cylinders 101, 102, and the branch pipe 106 branches the suction pipe 104 within the separator 105. The refrigerant is supplied into the cylinders 101 and 102.

JP-A-9-250477

However, the conventional rotary compressor has the following problems.
That is, as one means for improving the efficiency by reducing the vibration and noise of the rotary compressor described above, it is considered to reduce the moment in the shaft axis direction by reducing the thickness of the separator. And when the above-mentioned two suction pipes are connected to the upper and lower cylinders, there is a problem of workability that it is difficult to weld a portion between the upper suction pipe and the lower suction pipe to the housing. As an interval between the two suction pipes, a vertical distance necessary for welding a portion between the two suction pipes is necessary. For this reason, the separators separating the upper and lower cylinders must have a certain thickness, and there has been a restriction on thinning the separator.

  Further, the rotary compressor 100 shown in FIG. 10 has one suction pipe 104, and there is no difficulty in welding when welding the two suction pipes to the housing as described above. Since the branch part 106 which branches inside is provided, the separator 105 becomes thick and it is difficult to reduce the thickness, and there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and facilitates the processing of the suction pipe and makes it possible to reduce the thickness of the separator, thereby suppressing the occurrence of vibration and noise of the compressor. It is an object of the present invention to provide a rotary compressor that can be used.

  To achieve the above object, in a rotary compressor according to the present invention, a housing, a plurality of cylinders provided in the housing, a suction pipe connected to the housing and supplying a refrigerant into the plurality of cylinders, The first cutout portion is provided on one surface side of one cylinder of the plurality of cylinders, and the second cutout portion is provided on the other surface side of the other cylinders of the plurality of cylinders. Provided, and when the first cutout portion and the second cutout portion are joined, the suction pipe has a cross-sectional shape.

In the present invention, at least two cylinders of a plurality of cylinders can be combined, and a single suction pipe can be directly connected to the notches provided on the upper and lower surfaces of the cylinders. That is, a single suction pipe is connected to each cylinder without passing through the separator, and there is no need to interpose a branch portion of the suction pipe in the separator, thus ensuring a wide suction area in the cylinder part, The thickness dimension of the separator can be reduced.
Thus, by reducing the thickness of the separator and unifying the suction pipe, the entire rotary compressor can be reduced in weight, and the interval between the two cylinders sandwiching the separator can be reduced. The moment in the vertical direction) can be reduced. As a result, it is possible to reduce vibration and noise generated in the rotary compressor.

Further, since the cross-section of the two cylinders with the cut-out portions becomes the cross-sectional shape of the suction pipe, the cut-out portions of each cylinder are smaller than the cross-sectional shape of the suction pipe. Therefore, the thickness of the cylinder can be reduced as compared with the configuration in which one suction pipe is connected to each cylinder.
Furthermore, in the rotary compressor of the present invention, the material cost can be reduced with the thinning of the separator and the cylinder. Moreover, since the processing by the sheet metal punching method is possible, the efficiency of the processing work can be improved.

  Further, in the rotary compressor according to the present invention, since only one suction pipe is fixed to the housing by welding, a portion that is difficult to weld compared to the case where two suction pipes are welded to the housing. There is also an advantage that processing becomes easy.

  Moreover, in the rotary compressor which concerns on this invention, it is preferable that each opening area differs between the said 1st notch part and the said 2nd notch part.

  In the present invention, by providing a difference in notch shape between the one surface side and the other surface side of the cylinder, the suction area in each cylinder can be easily adjusted, and the pressure loss can be made uniform.

  Further, in the rotary compressor according to the present invention, the first notch portion of the cylinder located on the upper side among the plurality of cylinders arranged in the vertical direction is more than the second notch portion of the cylinder located on the lower side. It is preferable that the opening area is large.

  In the present invention, the suction pipe is arranged by shifting the central axis to the cylinder located on the upper side, and accordingly, the opening area of the notch portion of the upper cylinder is made larger than the opening area of the notch portion of the lower cylinder. can do. Therefore, when the refrigerant tends to flow into the lower cylinder due to the bending centrifugal force of the suction pipe before the suction, the refrigerant is evenly distributed to the upper and lower cylinders by increasing the suction sectional area of the upper cylinder. can do.

  In the rotary compressor according to the present invention, a cross-section of the flow path region is provided in the flow path region where the refrigerant is supplied to the cylinder located on the lower side among the plurality of cylinders arranged in the vertical direction. It is preferable that a convex portion to be reduced is provided.

  In this case, it is possible to cause pressure loss by providing a convex portion in the flow path region that flows to the lower cylinder side, and to equalize the flow rate of the refrigerant supplied to the upper and lower cylinders. Become.

  Also, in the rotary compressor according to the present invention, the suction pipe includes a part of a separator that partitions the plurality of cylinders, and the convex portion projects from the separator located in the flow path region. It is preferable that a portion is provided.

  In this case, a protrusion corresponding to the notch portion of the cylinder in the separator and having a pressure loss at the inlet portion of the cylinder is provided, so that processing is easy and effective for the upper and lower cylinders. The flow rate of the supplied refrigerant can be equalized.

  In the rotary compressor according to the present invention, the suction pipe includes a part of a separator that partitions the plurality of cylinders, and a portion of the separator located inside the suction pipe is bent downward. It is preferable that

  In this case, the position of the separator corresponding to the notch of the cylinder is bent downward so that the inlet of the lower cylinder causes pressure loss, so that no special member is used. Thus, it is possible to easily equalize the flow rate of the refrigerant supplied to the upper and lower cylinders.

  In the rotary compressor according to the present invention, the suction pipe is preferably provided with a rectifying plate.

  In this case, by providing a rectifying plate on the cylinder side with respect to the curved portion of the suction pipe, it is possible to suppress the bias of the refrigerant due to the centrifugal force of the curved portion, and to equalize the flow rate of the refrigerant supplied to the cylinder. be able to.

  According to the rotary compressor of the present invention, the suction pipe can be easily processed, and the thickness of the separator can be reduced, thereby suppressing the occurrence of vibration and noise of the compressor.

It is the longitudinal cross-sectional view which showed the structure of the rotary compressor by the 1st Embodiment of this invention. It is a principal part enlarged view of the rotary compressor shown in FIG. It is sectional drawing of the notch part in an upper and lower cylinder. It is a figure which shows the structure by which the suction pipe was connected to the upper cylinder, Comprising: It is sectional drawing in the surface orthogonal to the axis line of a compressor. It is a longitudinal cross-sectional view which shows the structure of the rotary compressor by a 1st modification, Comprising: It is a figure corresponding to FIG. It is a longitudinal cross-sectional view which shows the structure of the rotary compressor by a 2nd modification, Comprising: It is a figure corresponding to FIG. It is the sectional view on the AA line shown in FIG. 6, Comprising: It is the figure which simplified the structure of the separator. It is a longitudinal cross-sectional view which shows the structure of the rotary compressor by a 3rd modification, Comprising: It is a figure corresponding to FIG. It is a longitudinal cross-sectional view which shows the structure of the rotary compressor by 2nd Embodiment, Comprising: It is a figure corresponding to FIG. It is the longitudinal cross-sectional view which showed the principal part of the conventional rotary compressor.

  Hereinafter, a rotary compressor according to an embodiment of the present invention will be described with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention.

(First embodiment)
As shown in FIG. 1, a rotary compressor (hereinafter simply referred to as a compressor 1) of the present embodiment includes a disk-shaped cylinder 20A in a cylindrical sealed housing 11 having a central axis in the vertical direction. , 20B is a so-called two-cylinder type provided in two upper and lower stages. A cylindrical cylinder inner wall surface 20S having an axis in the vertical direction is formed at the center of the pair of cylinders 20A and 20B.

As shown in FIGS. 1 and 2, cylindrical piston rotors 21A and 21B having an outer diameter smaller than the inner diameter of the cylinder inner wall surface 20S are arranged inside the cylinders 20A and 20B. The piston rotors 21 </ b> A and 21 </ b> B are inserted and fixed to the eccentric shaft portions 23 </ b> A and 23 </ b> B of the shaft 22 along the center axis of the housing 11. Thus, spaces R each having a crescent-shaped cross section are formed between the cylinder inner wall surfaces 20S of the cylinders 20A and 20B and the outer peripheral surfaces of the piston rotors 21A and 21B.
Here, the upper-stage piston rotor 21 </ b> A and the lower-stage piston rotor 21 </ b> B are provided so that their phases are different from each other.
A disc-shaped separator 24 (see FIG. 3) is provided between the upper and lower cylinders 20A and 20B. The separator 24 partitions the space R in the upper cylinder 20A and the space R in the lower cylinder 20B into the compression chamber R1 and the compression chamber R2 without communicating with each other.

  As shown in FIG. 4, the upper and lower cylinders 20A and 20B are provided with blades 25 that divide the compression chambers R1 and R2 into two, respectively. In each of the cylinders 20A and 20B, the blade 25 is held in an insertion groove 20a formed extending in the radial direction of the cylinders 20A and 20B so as to be able to advance and retract in a direction approaching and separating from the piston rotors 21A and 21B Has been. The rear end portion of the blade 25 is pressed by a coil spring 25a, and the front end portion is always pressed against the piston rotors 21A and 21B.

As shown in FIG. 1, the shaft 22 is supported by upper and lower bearings 26A and 26B fixed to upper and lower cylinders 20A and 20B by bolts so as to be rotatable around its axis.
The shaft 22 is formed with eccentric shaft portions 23A and 23B that are offset in a direction orthogonal to the central axis of the shaft 22 inside the piston rotors 21A and 21B. The eccentric shaft portions 23A and 23B have outer diameters slightly smaller than the inner diameters of the piston rotors 21A and 21B. Thus, when the shaft 22 rotates, the eccentric shaft portions 23A and 23B rotate around the central axis of the shaft 22, and the upper and lower piston rotors 21A and 21B roll eccentrically in the cylinders 20A and 20B. At this time, since the blade 25 is pressed by the coil spring 25a, the tip part advances and retreats following the movement of the piston rotors 21A and 21B, and is always pressed against the piston rotors 21A and 21B.

  The shaft 22 protrudes upward from the upper bearing 26 </ b> A, and a rotor 32 of a motor 31 for rotating the shaft 22 is provided at the protruding portion. A stator 33 is fixed to the inner peripheral surface of the housing 11 so as to face the outer peripheral portion of the rotor 32.

  An opening 12 is formed on the side of the housing 11 at a position facing the outer peripheral surfaces of the cylinders 20A and 20B. In the cylinders 20A and 20B, a suction port 30 is formed at a position facing the opening 12 to communicate with a predetermined position on the cylinder inner wall surface 20S.

An accumulator 4 for gas-liquid separation of the refrigerant prior to supply to the compressor 1 is fixed to the housing 11 by a fixing means such as welding or a bolt via a plate-like bracket 41 outside the housing 11.
The accumulator 4 is provided with a suction pipe 40 for allowing the compressor 1 to suck the refrigerant in the accumulator 4. The tip 40 a of the suction pipe 40 is connected to the suction port 30 through the opening 12.

As shown in FIG. 2, the compressor 1 is provided with a first cutout portion 2A having a semicircular cross section on the lower surface of the upper cylinder 20A of the pair of upper and lower cylinders 20A, 20B. 20B is provided with a second cutout portion 2B having a semicircular cross section on the upper surface side, and when the first cutout portion 2A and the second cutout portion 2B are joined, as shown in FIG. It has a circular cross-sectional shape. The central axis of the suction pipe 40 is provided at a position that coincides with the center of the separator 24 in the thickness direction, and the first cutout portion 2A and the second cutout portion 2B have the same cross-sectional area.
In addition, the shape of the notches 2A and 2B is not limited to a circular cross-sectional shape in the state of being vertically aligned as described above, but may be a cross-sectional shape such as a rectangle or an ellipse.

  In such a compressor 1, as shown in FIG. 1, the refrigerant is taken into the accumulator 4 from the suction port 4 a of the accumulator 4, the refrigerant is gas-liquid separated in the accumulator 4, and the gas phase is sucked into the suction pipe 40. Is supplied to the compression chambers R1 and R2 which are the internal spaces of the cylinders 20A and 20B through the suction ports 30 of the cylinders 20A and 20B.

  Then, due to the eccentric rolling of the piston rotors 21A and 21B, the volumes of the compression chambers R1 and R2 are gradually reduced and the refrigerant is compressed. Discharge holes (not shown) for discharging refrigerant are formed at predetermined positions of the cylinders 20A and 20B, and reed valves (not shown) are provided in the discharge holes. Thereby, when the pressure of the compressed refrigerant increases, the reed valve is pushed open, and the refrigerant is discharged to the outside of the cylinders 20A and 20B. The discharged refrigerant is discharged from a discharge pipe 27 provided at the top of the housing 11 to an external pipe (not shown).

Next, the operation of the compressor 1 configured as described above will be specifically described with reference to the drawings.
As shown in FIG. 2, in this embodiment, two upper and lower cylinders 20A and 20B are combined, and a single suction pipe 40 is provided to the notches 2A and 2B provided on the upper and lower surfaces of the cylinders 20A and 20B. It can be configured to connect directly. That is, a single suction pipe 40 is connected to each cylinder 20A, 20B without passing through the separator 24, and there is no need to interpose a branch portion of the suction pipe 40 in the separator 24. The thickness dimension of the separator 24 can be reduced while ensuring a large area. For example, the separator 24 having a thickness of about 1 cm can be reduced to a thickness of about 3 mm in the present embodiment.
The separator 24 only needs to have a thickness that does not bend due to compression in the cylinders 20A and 20B, and is preferably as thin as possible.

  Thus, by reducing the thickness of the separator 24 and unifying the suction pipe 40, the overall compressor 1 can be reduced in weight, and the distance between the two cylinders 20A and 20B sandwiching the separator 24 can be reduced. The moment in the shaft axis direction (vertical direction) can be reduced. Thereby, reduction of the vibration and noise which arise in the compressor 1 can be aimed at.

  Further, as shown in FIG. 3, since the cross section of the notches 2A and 2B of the two cylinders 20A and 20B is the cross-sectional shape of the suction pipe 40, the notches 2A and 2B of the cylinders 20A and 20B are the suction pipes. It becomes smaller than the cross-sectional shape of 40. Therefore, the thickness of the cylinders 20A and 20B can be reduced as compared with the configuration in which one suction pipe is connected to each cylinder 20A and 20B.

Furthermore, in this Embodiment, material cost can be reduced with the thinning of the separator 24 and cylinder 20A, 20B.
Moreover, since the processing by the sheet metal punching method is possible, the efficiency of the processing work can be improved.

  Further, in the compressor 1 according to the present embodiment, since only one suction pipe 40 is fixed to the housing 11 by welding, welding is performed compared to the case where two suction pipes are welded to the housing. There is an advantage that processing is easy without any difficult parts.

  In the compressor 1 according to the present embodiment, the suction pipe 40 can be arranged so that the opening areas of the first notch 2A and the second notch 2B are different. For example, by shifting the center point of the suction pipe 40 to the upper side, the opening area ratio between the first notch 2A and the second notch 2B is changed, and the first notch 2A of the cylinder 20A located on the upper side is lowered. The opening area can also be increased by the second notch 2B of the cylinder 20B located at the position.

Thus, by providing a difference in the notch shape between the one surface side and the other surface side of the cylinders 20A, 20B, the suction area in each cylinder 20A, 20B can be easily adjusted, and the pressure loss is made uniform. It becomes possible.
Therefore, in the case where the refrigerant easily flows into the lower cylinder 20B due to the bending centrifugal force of the suction pipe 40 before the suction, the upper and lower cylinders 20A, 20B are increased by increasing the suction sectional area of the upper cylinder 20A. The refrigerant can be distributed evenly.

  In the rotary compressor according to the present embodiment described above, the processing of the suction pipe 40 is facilitated, and the thickness of the separator 24 can be reduced, thereby suppressing the vibration and noise of the compressor 1. Can do.

  Next, a modified example of the first embodiment by the rotary compressor of the present invention and other embodiments will be described based on the accompanying drawings, but the same as or similar to the above-described first embodiment. The members and portions are denoted by the same reference numerals, and the description thereof is omitted, and a configuration different from that of the first embodiment will be described.

(First modification)
As shown in FIG. 5, the compressor 1 (rotary compressor) according to the first modified example has a cross-section of the flow path region 40A in a flow path region 40A where the refrigerant is supplied to the cylinder 20B located on the lower side. The convex portions 5A and 5B to be reduced are provided. 5A is provided on the lower peripheral edge 24a of the separator 24 included in the flow path region 40A.
In the first modified example, by providing the convex portions 5A and 5B in the flow path region 40A of the cutout portion 2B flowing to the lower cylinder 20B side, pressure loss can be caused and supplied to the upper and lower cylinders 20A and 20B. It is possible to equalize the flow rate of the refrigerant.

In this modification, the two convex portions 5A and 5B are described, but the number, position, shape, and the like of the convex portions can be set as appropriate. The material of the convex portions 5A and 5B may be the same as or different from the material of the cylinders 20A and 20B and the separator 24. Furthermore, the convex portions 5A and 5B may be provided integrally with the cylinders 20A and 20B and the separator 24, or may be separate.
Furthermore, in this modification, the notch 2B of the cylinder 20B is provided with the convex portion 5B, but it may be within the flow path region 40A, and is provided on the inner surface of the suction port 30 or the suction pipe 40. It doesn't matter.

(Second modification)
Next, as shown in FIGS. 6 and 7, in the compressor 1 (rotary compressor) according to the second modification, a portion (bent portion 24c) of the separator 24 located inside the suction pipe 40 is directed downward. And bent.
In this case, since the bent portion 24c of the separator 24 is bent downward so that the inlet portion of the lower cylinder 20B causes pressure loss, the upper and lower cylinders 20A can be easily formed without using a special member. , 20B can equalize the flow rate of the refrigerant supplied.
In this modification, the bent portion 24c of the separator 24 is bent downward, but it may be bent upward.

(Third Modification)
Next, as shown in FIG. 8, the compressor 1 (rotary compressor) according to the third modification has a configuration in which the rectifying plate 6 is provided in the cylinders 20 </ b> A and 20 </ b> B from the curved portion 40 c inside the suction pipe 40. It has become.
In this case, since the rectifying plate 6 is provided on the downstream side of the curved portion 40c of the suction pipe 40, the refrigerant bias due to the curved portion centrifugal force in the curved portion 40c of the suction pipe 40 can be suppressed, and the cylinder 20A. , 20B can equalize the flow rate of the refrigerant supplied.

(Second Embodiment)
As shown in FIG. 9, the compressor 1A (rotary compressor) according to the second embodiment is connected to a branch pipe 7 provided in front of the upper and lower cylinders 20A and 20B by a single suction pipe 40. It is the composition to do. The branch pipe 7 branches up and down in the housing 11, and the branched ends are connected to the inflow portions of the cylinders 20A and 20B.
In the second embodiment, the pressure loss can be changed by the branch pipe 7, and the flow rate of the refrigerant supplied to the cylinders 20A and 20B can be equalized.

  As mentioned above, although embodiment of the rotary compressor by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.

  For example, in the present embodiment, a twin rotary compressor having two cylinders 20A and 20B is applied, but the present invention is not limited to this, and a triple rotary compressor having three cylinders, etc. The present invention can be applied to a compressor having two or more cylinders.

  Moreover, although various flow equalization means were shown in embodiment and the modification which were mentioned above, it is not limited to this. For example, as another flow equalization means, a method of setting a longer distance from the curved portion 40c of the suction pipe 40 to the cylinders 20A, 20B, a method of reducing the curvature of the curved portion 40c, or the diameter of the suction pipe 40 It is possible to adopt a method of increasing the size.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described embodiments may be appropriately combined.

1 Compressor (Rotary compressor)
2A 1st notch part 2B 2nd notch part 4 Accumulator 5A, 5B Convex part 6 Current plate 7 Branch pipe 11 Housing 12 Opening part 20A, 20B Cylinder 21A, 21B Piston rotor 22 Shaft 23A, 23B Eccentric shaft part 24 Separator 25 Blade 40 Suction pipe 40c

Claims (7)

A housing;
A plurality of cylinders provided in the housing;
A suction pipe connected to the housing and supplying refrigerant into the plurality of cylinders;
With
One cylinder of the plurality of cylinders is provided with a first notch on one side,
The other cylinder of the plurality of cylinders is provided with a second notch on the other surface side,
The rotary compressor according to claim 1, wherein the suction pipe has a cross-sectional shape when the first notch and the second notch are joined.   2. The rotary compressor according to claim 1, wherein the first cutout portion and the second cutout portion have different opening areas.   The first cutout portion of an upper cylinder among the plurality of cylinders arranged in the vertical direction has a larger opening area than the second cutout portion of a cylinder located on the lower side. The rotary compressor according to 2.   Among the plurality of cylinders arranged in the vertical direction, a flow path region in which the refrigerant is supplied to the cylinder located on the lower side is provided with a convex portion that reduces the cross section of the flow path region. The rotary compressor according to any one of claims 1 to 3, wherein the rotary compressor is provided. The suction pipe includes a part of a separator that partitions between the plurality of cylinders,
The rotary compressor according to claim 4, wherein the convex portion is provided in the separator in a portion located inside the flow path region. The suction pipe includes a part of a separator that partitions the plurality of cylinders;
6. The rotary compressor according to claim 1, wherein a portion of the separator located inside the suction pipe is bent downward.   The rotary compressor according to any one of claims 1 to 6, wherein a rectifying plate is provided in the suction pipe.

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