JP2008163874A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary compressor having a structure of not reducing performance of the rotary compressor, while avoiding the occurrence of strain of a cylinder of an area for constituting a suction conduit, even when fastening force of a through-bolt used for fastening a front head and a rear head is applied. <P>SOLUTION: In this cylinder 12A, a stepped area 120c recessed outside in the radial direction over the whole periphery, is arranged on an inner peripheral surface on the suction pipe connecting port 120b side of the suction conduit 120. A suction pipe 5 is inserted into and connected to a suction pipe connecting port 120b so that a step height is not generated in a butting part of an inner surface of the suction conduit 120 and an inner surface of the suction pipe 5 (an area surrounded by A in Fig. 3). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary compressor, and more particularly to an improvement in the structure of a rotary compressor.

<Overall configuration of rotary compressor>
With reference to FIG. 5 and FIG. 6, the whole structure of a rotary compressor is demonstrated. 5 is a longitudinal sectional view showing the entire configuration of the rotary compressor, and FIG. 6 is a sectional view taken along line VI-VI in FIG. The rotary compressor has a casing 1, and the casing 1 is sealed by the upper end opening of the cylindrical intermediate cylinder 2 being closed by the upper lid 3 and the lower end opening being closed by the lower lid 4. It is configured in a sealed structure. A suction pipe 5 for introducing a gas as a refrigerant into the casing 1 is connected to the lower end side of the intermediate cylinder 2, and a discharge pipe 6 for discharging the high-pressure compressed gas compressed in the casing 1 to the outside is connected to the upper lid 3. Is connected.

  A compression element 7 for sucking and compressing gas is disposed on the lower end side of the casing 1 in correspondence with the suction pipe 5, and a drive element 8 for operating the compression element 7 is disposed almost above the entire interior space. It is arranged to occupy. In the internal space defined by the lower lid 4 at the lower end portion of the casing 1, an oil reservoir 9 for storing the lubricating oil O is formed, and in other spaces, a storage space 10 for storing the compressed gas is formed. .

<Compression element 7>
The compression element 7 has a cylinder 12 having a cylinder chamber 11 having a circular cross-sectional shape, and a front head 13 having a boss-like bearing portion 13a at the center on both the upper and lower surfaces of the cylinder 12 and a boss at the center. The cylinder head 11 is hermetically sealed by fastening a plurality of through bolts 15 to the rear head 14 having a bearing portion 14a.

  The peripheral edge of the cylinder 12 is fixed to the inner wall surface of the intermediate cylinder 2 of the casing 1 and is supported in the casing 1 in a horizontal state. The muffler member 16 is fixed to the front head 13 so as to provide an annular gap around the bearing portion 13 a of the front head 13 with the muffler member 16.

  The cylinder 12 is provided with a suction pipe 120. The suction pipe 120 has an inlet 120a that opens toward the cylinder chamber 11 at one end, and an inlet pipe connecting port 120b into which the inlet pipe 5 is inserted at the other end. have. By inserting the suction pipe 5 into the suction pipe 120, the suction pipe 5 and the cylinder chamber 11 are communicated with each other. A discharge port 12b is formed on the side of the suction port 120a of the cylinder 12, and the discharge port 12b communicates with a recess 12c formed on the back side thereof. The recess 12c is a through-hole formed in the front head 13 ( (Not shown) communicates with the storage space 10. As a result, the cylinder chamber 11 communicates with the storage space 10.

  A leaf spring-like discharge valve 17 is disposed in the recess 12c so as to be supported by a pin 18 so that the discharge port 12b can be opened and closed, and prevents the compressed gas discharged into the storage space 10 from flowing back into the cylinder chamber 11.

  A piston 19 is disposed in the cylinder chamber 11 of the cylinder 12. The piston 19 includes an annular roller 20 having a circular insertion hole 20a, and a rectangular plate-like blade 21 integrally projecting radially outward on the side wall of the roller 20. The roller 20 is eccentrically arranged in the cylinder chamber 11 by a crankshaft 26 described later.

  A blade sliding groove 12d extending outward in the cylinder radial direction is provided between the suction port 120a and the discharge port 12b of the cylinder 12, and an overall portion of the blade sliding groove 12d has a cylindrical shape (that The planar shape is a shape in which the upper and lower end portions of a substantially perfect circle shape are cut off), and a bush hole 12e that bulges outward from both sides of the blade sliding groove 12d is formed. In this bush hole 12e, two substantially semi-cylindrical block-shaped blade bushes 22 that constitute a rotation clamping body are arranged so as to be rotatable around a rotation center Q. The blade 21 of the piston 19 is sandwiched so as to be slidable in the radial direction of the cylinder from both sides by the blade bushing 22 while being inserted into the blade sliding groove 12d. It swings around.

<Drive element 8>
The drive element 8 includes an electric motor including a stator 24 and a rotor 25, and the stator 24 is fixedly supported on the inner wall surface of the intermediate cylinder 2 of the casing 1. The rotor 25 is arranged concentrically inside the stator 24 with a predetermined gap in the circumferential direction. The upper half portion of the crankshaft 26 is rotatably integrated around the shaft center P inside the rotor 25, and the lower half portion of the crankshaft 26 is rotatable to both bearing portions 13a and 14a of the front head 13 and the rear head 14. It is inserted and supported.

  An oil passage 26 a extending in the axial direction is formed in the crankshaft 26, and a centrifugal oil pump 27 is attached to the lower end of the crankshaft 26. The oil pump 27 is constantly immersed in the lubricating oil O of the oil reservoir 9, sucks the lubricating oil O into the oil passage 26 a according to the rotation of the crankshaft 26, and supplies it to the sliding portions of the compression element 7 and the driving element 8. It is like that.

  An eccentric shaft portion 26 b is provided near the lower end of the crankshaft 26. The eccentric shaft portion 26 b is located in the cylinder chamber 11 and is rotatably inserted into the insertion hole 20 a of the roller 20 of the piston 19. Accordingly, the roller 20 rotates eccentrically in the cylinder chamber 11 by the rotation of the crankshaft 26 around the axis P. The cylinder chamber 11 is divided into a suction chamber 11a and a compression chamber 11b by a blade 21.

  The volumes of the suction chamber 11a and the compression chamber 11b gradually change due to the eccentric rotational movement of the roller 20, and when the roller 20 is at the top dead center position that simultaneously closes the suction port 120a and the discharge port 12b, When the entire cylinder chamber 11 becomes the suction chamber 11a and the roller 20 is at the position of the bottom dead center 180 ° opposite to the cylinder chamber 11, the volume of the suction chamber 11a and the compression chamber 11b is equalized with the blade 21 as a boundary. It has become.

  The thus configured rotary compressor is used, for example, to compress refrigerant gas in a refrigerant circuit of an air conditioner. In this case, the refrigerant gas is sucked into the suction chamber 11a of the cylinder chamber 11 through the suction pipe 5 from the evaporator. The sucked refrigerant gas is compressed in the compression chamber 11b as the roller 20 rotates eccentrically. The refrigerant gas in a high pressure state is discharged from the discharge port 12b to the storage space 10 through a gap between the bearing portion 13a of the front head 13 and the muffler member 16, and further discharged to the condenser through the discharge pipe 6. The During this time, in the compression chamber 11b, the refrigerant gas is compressed in a mixed gas state in which the lubricating oil O is mixed. Therefore, the lubricating oil O is scattered in the mist state in the storage space 10, and the lubricating oil O in the mist state is It is separated from the refrigerant gas and collected in the oil sump 9. As a rotary compressor which consists of such a structure, what is published by the following patent document 1 is mentioned.

<Communication structure between suction pipe 5 and cylinder chamber 11>
Here, the communication structure between the suction pipe 5 and the cylinder chamber 11 will be described in detail with reference to FIG. 7 is a partial cross-sectional view taken along line VII in FIG. As described above, the suction pipe 120 is provided in the cylinder 12, and the suction pipe 5 is connected to the suction pipe connection port 120 b side of the suction pipe 120. As the inner diameter of the suction pipe 120, a dimension corresponding to the outer diameter of the suction pipe 5 is usually selected, and the suction pipe 5 is press-fitted into the suction port 120a. Therefore, the thickness of the cylinder 12 in the region constituting the suction conduit 120 is t2 in the vertical direction along the suction conduit 120. Further, the entire thickness h of the cylinder 12 is in the direction of decreasing the thickness from the viewpoint of miniaturization of the rotary compressor. As a result, the thickness t2 of the cylinder 12 in the region constituting the suction conduit 120 is also reduced.

  On the other hand, the cylinder 12 is fastened from above and below by the front head 13 and the rear head 14 using a through bolt 15 in order to keep the cylinder chamber 11 in a sealed state. In order to prevent the roller 20 and the cylinder chamber 11 from being caught, it is necessary to set a clearance in consideration of the distortion of the cylinder 12. However, since the clearance between the roller 20 and the cylinder chamber 11 affects the performance of the rotary compressor, it is necessary to set it as small as possible.

  Further, as described above, since the thickness t2 of the cylinder 12 in the region constituting the suction conduit 120 tends to be thin, the rigidity of the cylinder 12 in the region constituting the suction conduit 120 is lowered. As a result, it is conceivable that the cylinder 12 in the region constituting the suction pipe 120 is distorted by the fastening force F by the through bolt 15, and the height H of the cylinder chamber 11 is lowered in the vicinity of this region. Accordingly, it is necessary to increase the clearance between the roller 20 and the cylinder 12, and there is a concern that the performance of the rotary compressor may be deteriorated by setting the clearance large.

Here, as shown in FIG. 8, in order to maintain the rigidity of the cylinder 12, in the cylinder 12 in the region constituting the suction conduit 120, the thickness t <b> 3 of the cylinder 12 is increased only in the region 12 a near the suction port 120 a. It is possible to do. However, simply increasing the thickness t3 of the neighboring region 12a causes a large step in the suction pipe 120. This level difference greatly impedes the flow of the gas C <b> 2 discharged from the suction pipe 5, causing pressure loss and also causing a vortex 120 x in the suction pipe 120. As a result, even if the thickness t3 of the neighborhood region 12a is simply increased, the performance of the rotary compressor may be degraded.
Japanese Patent Laid-Open No. 10-169580

  The problem to be solved by the present invention is that the cylinder in the region constituting the suction pipe is distorted by the fastening force F of the through bolt used to fasten the front head and the rear head, so that the roller and cylinder The clearance must be set large, and there is a concern about the deterioration of the performance of the rotary compressor. Therefore, the present invention has been made to solve the above-described problems, and even when a fastening force of a through bolt used for fastening a front head and a rear head is applied, a region constituting the suction pipe It is an object of the present invention to provide a rotary compressor having a structure that avoids the occurrence of distortion of the cylinder and does not cause a decrease in performance of the rotary compressor.

  In the rotary compressor according to the present invention, the rotary piston that is inserted into the eccentric shaft portion of the crankshaft and disposed in the cylinder chamber and revolves in the cylinder chamber, and the cylinder chamber is divided into a suction chamber and a compression chamber. The rotary compressor includes a blade that compresses the gas sucked from the suction port and discharges the gas to the discharge port.

The cylinder defining the cylinder chamber is provided with a suction pipe having the suction port defined at one end and the suction pipe connection port defined at the other end. The peripheral surface is provided with a stepped region that is recessed radially outward over the entire circumference, and the suction pipe is inserted and disposed in the stepped region in a state where the suction pipe is inserted and connected to the suction pipe connection port. Thus, a configuration is adopted in which no step is generated at the abutting portion between the suction pipe inner surface and the suction pipe inner surface.

  According to the rotary compressor based on this invention, the inner peripheral surface on the suction pipe connection port side of the suction pipe is provided with the stepped region recessed outward in the radial direction over the entire circumference, so that the fastening force by the through bolt is provided. The thickness of the area near the suction port where the pressure is applied becomes thicker than the suction pipe connection port side, preventing the cylinder's rigidity from decreasing, and even if the tightening force by the through bolt is applied, It is possible to avoid the occurrence.

  Furthermore, a configuration is adopted in which no step is generated at the abutting portion between the inner surface of the suction pipe and the inner surface of the suction pipe when the suction pipe is inserted and connected to the suction pipe connection port. Thereby, the surfaces of the suction pipe inner surface and the suction pipe inner surface at the abutting portion between the suction pipe inner surface and the suction pipe inner surface are flush with each other. As a result, gas can flow smoothly in the suction pipe, and pressure loss and vortex flow can be avoided.

  As described above, even when the fastening force of the through bolt used to fasten the front head and the rear head is applied, the performance of the rotary compressor is reduced while avoiding the occurrence of distortion of the cylinder in the area constituting the suction pipe. Thus, it is possible to provide a rotary compressor having a structure that does not cause the problem.

  Hereinafter, embodiments of a rotary compressor based on the present invention will be described with reference to the drawings. The basic configuration of the rotary compressor in the present embodiment is the same as the structure of the rotary compressor described with reference to FIGS. 5 and 6, and the rotation inserted into the eccentric shaft portion 26 b of the crankshaft 26. The piston 20 is disposed in a cylinder chamber 11 provided in the cylinder 12, and a blade 21 extending in the radial direction provided in the rotary piston 20 is inserted into a blade sliding groove 12 d formed in the cylinder 12, and the blade slides. The blade 21 is slidably and slidably held by a blade bush 22 disposed in a bush hole 12e provided in the cylinder 12 so as to constitute a part of the groove 12d, and the crankshaft 26 is rotated about the axis P. Thus, the rotating piston 20 is eccentrically rotated in the cylinder chamber 11 and the blade 21 is swung while being slid. By 1 blade 21 is divided into a suction chamber 11a and the compression chamber 11b, while the suction in the suction chamber 11a of the gas, a rotary compressor for compressing in the compression chamber 11b.

  Accordingly, in the following description, the same or corresponding parts are denoted by the same reference numerals, and repeated description will not be repeated, and only characteristic components of the present invention will be described in detail below.

  First, with reference to FIG. 1 and FIG. 2, the characteristic part of the rotary compressor in this Embodiment is demonstrated. FIG. 1 is a partially enlarged sectional view of a cylinder employed in the rotary compressor in the present embodiment, and FIG. 2 is a partially enlarged sectional view in a state in which the cylinder is incorporated. 1 and 2 corresponds to the cross section taken along line VII in FIG.

As shown in the cross-sectional view of FIG. 1, the cylinder 12A that defines the cylinder chamber 11 in the present embodiment has a suction pipe 120 having a suction port 120a defined at one end and a suction pipe connection port 120b defined at the other end. Is provided. Further, a stepped region 120c that is recessed outward in the radial direction is provided on the inner peripheral surface of the suction pipe 120 on the suction pipe connection port 120b side.

  FIG. 2 shows a state in which the cylinder 12 </ b> A having the above configuration is fastened by the front head 13 and the rear head 14 from above and below using the through bolt 15 in order to make the cylinder chamber 11 sealed. Further, the suction pipe 5 is inserted and arranged in the stepped region 120c.

  In the present embodiment, the inner diameter (H1) of the suction port 120a, where the stepped region 120c of the suction pipe 120 is not provided, and the inner diameter (H2) of the suction pipe 5 are the same. In addition, the amount of depression (d1) in the radially outward direction of the stepped region 120c is set. As an example, in the present embodiment, in the cylinder 12A, the difference between the upper and lower wall thickness (t1) of the region 120d and the upper and lower wall thickness (t2) of the stepped region 120c (the amount of depression (d1)) is It becomes the thickness (t3) of the suction pipe 5. Further, as shown in FIG. 2, the depth (d2) of the stepped region 120c toward the cylinder chamber 11 is provided to be the same as the amount into which the suction pipe 5 is to be inserted.

  As described above, by providing the stepped region 120c that is recessed radially outward over the entire circumference on the inner peripheral surface of the suction pipe 120 on the suction pipe connection port 120b side, the suction port 120a to which the fastening force by the through bolt 15 is applied. When the wall thickness (t1) in the vicinity region becomes thicker than the wall thickness (t2) on the suction pipe connection port 120b side to prevent the rigidity of the cylinder 12A from being lowered and the fastening force by the through bolt 15 is applied. Even so, it is possible to avoid the occurrence of distortion in the cylinder 12A.

  Further, in a state where the suction pipe 5 is inserted and connected to the suction pipe connection port 120b, as shown in a partially enlarged view of FIG. 3, a butt portion between the inner surface of the suction pipe 120 and the inner surface of the suction pipe 5 (FIG. 3). No step is produced in the area surrounded by A in the figure. Thus, the surfaces of the inner surface of the suction pipe 120 and the inner surface of the suction pipe 5 are flush with each other at the abutting portion between the inner surface of the suction pipe 120 and the inner surface of the suction pipe 5. As a result, the gas C1 can flow smoothly in the suction pipe line 120 without causing pressure loss, and the generation of vortex flow can be avoided.

  As described above, even when the fastening force of the through bolt 15 used for fastening the front head 13 and the rear head 14 is applied to the cylinder 12A, the front head 13 and the rear head 14, the cylinder in the region constituting the suction pipe 120 Generation of 12A distortion can be avoided. As a result, since the height (H) of the cylinder chamber 12 becomes constant, the performance of the rotary compressor due to the change in the capacity of the compression chamber is not reduced.

  Further, also in the step of inserting the suction pipe 5 into the suction pipe 120, the distal end portion of the suction pipe 5 is brought into contact with the end face T (see FIG. 3) formed at the boundary between the region 120d and the stepped region 120c. By doing so, the positioning of the suction pipe 5 to the suction pipe 120 can be reliably performed, and the workability of insertion of the suction pipe 5 into the suction pipe 120 is improved and the reliability is improved. It is also possible.

  In addition, by adopting the shape of the cylinder 12A in the present embodiment, it is possible to suppress an increase in the height (h) of the cylinder 12A. As a result, as shown in FIG. 4, in the rotary compressor including the first cylinder 110 </ b> A and the second cylinder 110 </ b> B adopting the suction pipe 120 having the same shape as the cylinder 12 </ b> A along the axial direction of the crankshaft 26. Further, it is possible to suppress a decrease in the performance of the rotary compressor due to gas leakage from the compression chamber rollers and the cylinder gap while suppressing an increase in the height of the rotary compressor.

In the above embodiment, as an example, in the cylinder 12A, the region 120 is
When the difference between the upper and lower wall thicknesses (t1) of d and the upper and lower wall thicknesses (t2) of the stepped region 120c (the amount of depression (d)) is the wall thickness (t3) of the suction pipe 5. It explains about.

  However, in the present invention, in a state where the suction pipe 5 is inserted and connected to the suction pipe connection port 120b, the butted portion (the region surrounded by A in FIG. 3) between the inner surface of the suction pipe 120 and the inner surface of the suction pipe 5 It is important that no difference in level occurs. Therefore, if the inner diameter (H1) of the region 120d at the abutting portion between the inner surface of the suction pipe 120 and the inner surface of the suction pipe 5 is the same as the inner diameter (H2) of the suction pipe 5, the upper and lower portions of the stepped region 120c The difference from the thickness (t2) (the amount of depression (d1)) may be larger than the thickness (t3) of the suction pipe 5.

  Further, in the above embodiment, the case where the inner diameter (H1) of the suction pipe 120 is uniform is illustrated, but the suction pipe whose inner diameter changes toward the suction port 120a is employed. Even in such a case, it is only necessary that the inner diameter (H1) of the region 120d and the inner diameter (H2) of the suction pipe 5 at the abutting portion between the inner surface of the suction pipe 120 and the inner surface of the suction pipe 5 are the same.

  Therefore, the above-described embodiment disclosed herein is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a partial expanded sectional view of the cylinder employ | adopted as the rotary compressor in embodiment based on this invention. It is a partial expanded sectional view in the state where a cylinder was built in a rotary compressor in an embodiment based on this invention. It is the elements on larger scale of the butting | matching part of the inner surface of a suction pipe line and the inner surface of a suction pipe in the rotary compressor in embodiment based on this invention. It is a fragmentary sectional view of the compression element part of the rotary compressor in other embodiment based on this invention. It is a longitudinal section showing the whole rotary compressor composition shown in background art. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. FIG. 7 is a partial cross-sectional view taken along line VII in FIG. 6. It is a typical fragmentary sectional view which shows generation | occurrence | production of the eddy current corresponding to the VII line arrow in FIG.

Explanation of symbols

1 casing, 2 intermediate cylinder, 3 upper lid, 4 lower lid, 5 suction pipe, 7 compression element, 8
Drive element, 9 Oil reservoir, 10 Storage space, 11 Cylinder chamber, 11a Suction chamber, 11b Compression chamber, 12, 12A Cylinder, 12b Discharge port, 12c Recess, 12d Blade sliding groove, 12e Bush hole, 13 Front head, 13a bearing part, 14 rear head, 14a bearing part, 15 through bolt, 16 muffler member, 17 discharge valve, 18
Pin, 19 Piston, 20 Roller, 20a Insertion hole, 21 Blade, 22 Blade bush, 24 Stator, 25 Rotor, 26 Crankshaft, 26a Oil passage, 26b Eccentric shaft part, 27 Oil pump, 110A 1st cylinder, 110B 1st 2 cylinders, 120 suction line, 120a suction port, 120b suction pipe connection port, 120c stepped region, 120d region.

Claims (3)

The rotating piston (20) and the cylinder chamber (11) that are inserted into the eccentric shaft portion (26b) of the crankshaft (26) and disposed in the cylinder chamber (11) and revolve in the cylinder chamber (11) A rotary compressor that includes a blade (21) partitioned into a suction chamber (11a) and a compression chamber (11b), compresses the gas sucked from the suction port (120a), and discharges the gas to the discharge port (12b). ,
The cylinder (12) that defines the cylinder chamber (11) is provided with a suction pipe (120) in which the suction port (120a) is defined at one end and a suction pipe connection port (120b) is defined at the other end. And
On the inner peripheral surface of the suction pipe (120) on the suction pipe connection port (120b) side, a stepped region (120c) that is recessed radially outward is provided over the entire circumference,
In the state where the suction pipe (5) is inserted and connected to the suction pipe connection port (120b), the suction pipe (5) is inserted and arranged in the stepped region (120c), so that the suction pipe (120 ) A rotary compressor in which no step is generated at the abutting portion between the inner surface and the suction pipe (5).   The inner diameter (H1) of the area where the stepped area (120c) of the suction pipe (120) is not provided is the same as the inner diameter (H2) of the suction pipe (5). Rotary compressor. The rotary compressor includes a first cylinder chamber (11A) and a second cylinder chamber (11B) along the axial direction of the crankshaft (26),
The rotary compressor according to claim 1 or 2, wherein a suction pipe (120) having the stepped region (120c) is provided in each cylinder chamber (110A, 110B).

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