JP2005090350A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively reduce vibration and noise caused by pulsation of fluid without increasing size of a compressor and manufacturing cost. <P>SOLUTION: This compressor has a cylinder block in which bore forming a compression chamber for fluid is provided and a cylinder head provided to seal an end face of the cylinder block. The cylinder head has a central side space formed in its central part and an outer side space formed to surround the central side space, and the central side space and the outer side space are communicated with the compression chamber, respectively. This compressor is provided with a bulkhead partitioning the central side space into two chambers in the vertical direction for the direction of advance of fluid and a communicating hole provided in the bulkhead and communicating two chambers mutually. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor used in a vehicle air conditioner or the like.

As a conventional compressor, there is a cylinder head in which a resonance chamber composed of a space portion that is connected to a suction chamber or a discharge chamber and is applied with a damping action of a form hertz resonator is formed. It is said that the noise generated by the self-excited vibration of the suction valve or the discharge valve can be attenuated by appropriately setting (see Patent Documents 1 and 2).
JP 2000-179458 A JP 2000-161219 A

  However, the configurations disclosed in Patent Documents 1 and 2 are difficult to process the resonance chamber, and have problems in terms of manufacturing costs.

  Therefore, an object of the present invention is to effectively reduce vibration and noise due to fluid pulsation without increasing the size of the compressor and increasing the manufacturing cost.

  In order to solve the above problems, the present invention includes a cylinder block having a bore for defining a fluid compression chamber, and a cylinder head provided to seal an end surface of the cylinder block. The cylinder head has a central side space defined at a central portion thereof and an outer space defined so as to surround the central side space, and the central side space and the outer space are respectively provided in the compression chamber. In the compressor formed in communication with the compressor, a partition that divides the central space into two chambers in a direction perpendicular to the fluid traveling direction, and a communication hole that is formed in the partition and communicates with the two chambers. (Claim 1).

  The central space may be a discharge chamber that stores a compressed fluid, and the outer space may be a suction chamber that stores a fluid before compression (Claim 2). The side space may be a suction chamber in which the fluid before compression is accommodated, and the outer space may be a discharge chamber in which the fluid after compression is accommodated.

  The partition may have a bent shape (claim 4).

  According to the configuration of the first aspect, when a pulsating wave is generated in one of the two chambers defined in the central space by the partition wall, the other chamber functions as an inflatable muffler, and the pulsating wave is generated. Can be attenuated. Thereby, noise can be reduced without increasing the size of the compressor and increasing the manufacturing cost.

  According to the configuration of the second aspect, pulsation caused by the high pressure fluid sent from the compression chamber can be reduced, and according to the configuration of the third aspect, the pulsation caused by the low pressure fluid sent to the compression chamber. Can be reduced.

  According to the structure of the said Claim 4, it can avoid that the said partition interferes with a discharge hole or a suction hole, a predetermined fixing member, etc.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  A compressor 1 shown in FIG. 1 includes a cylinder block 2 and a rear cylinder head (hereinafter abbreviated as a rear head) 4 assembled to a rear side (right side in the figure) of the cylinder block 2 via a valve plate 3. And a front side cylinder head (hereinafter abbreviated as front head) 5 assembled so as to close the front side (left side in the drawing) of the cylinder block 2. The block 2, the valve plate 3, and the rear head 4 are fastened in the axial direction by bolts and constitute a housing of the compressor 1 as a whole.

  A drive shaft 11 and a swash plate mechanism 12 are accommodated in a crank chamber 10 defined by the front head 5 and the cylinder block 2. The cylinder block 2 is formed with a plurality of (six in this embodiment) bores 20 arranged at equal intervals on the circumference centered on the drive shaft 11. 21 is slidably inserted.

  A thrust flange 25 that rotates integrally with the drive shaft 11 is fixed to the drive shaft 11 in the crank chamber 10, and a swash plate 27 is connected to the thrust flange 25 via a link mechanism 26. The swash plate 27 is attached so as to be tiltable about a hinge ball 28 provided on the drive shaft 11, and rotates in synchronization with the thrust flange 25. The swash plate 27 is moored to the piston 21 through a pair of shoes 29 whose peripheral portions are provided at the front and rear. As a result, the swash plate 27 rotates with the rotation of the drive shaft 11, and the rotational motion of the swash plate 27 is converted into the reciprocating linear motion of the piston 21 via the shoe 29. The volume of the compression chamber defined between is changed.

  The valve plate 3 is formed with suction holes 30 and discharge holes 31 corresponding to the respective bores 20, and the rear head 4 accommodates the fluid flowing into the compression chamber as shown in FIGS. 1 and 2. A suction chamber 33 and a discharge chamber 34 for storing fluid discharged from the compression chamber are defined with a partition wall 35 therebetween. In the present embodiment, the discharge chamber 34 is formed on the center side of the rear head 4, communicates with the high-pressure line of the refrigeration cycle, and communicates with the compression chamber via the discharge hole 31 of the valve plate 3. The discharge hole 31 is opened and closed by a discharge valve 37 disposed on the rear side of the valve plate 3. The suction chamber 33 is formed around the discharge chamber 34, communicates with the low-pressure line of the refrigeration cycle, and communicates with the compression chamber via the suction hole 30 of the valve plate 3. The suction hole 30 is opened and closed by a suction valve 36 disposed on the front side of the valve plate 3.

  The discharge capacity of the compressor 1 is determined by the stroke of the piston 21, and this stroke is determined by the pressure applied to the front surface of the piston 21 (in the compression chamber) and the pressure applied to the back surface of the piston 21 (in the crank chamber 10). Determined by differential pressure. That is, if the pressure in the crank chamber 10 is increased, the differential pressure decreases, so that the hinge ball 28 slides toward the cylinder block 2, the inclination (swing) angle of the swash plate 27 decreases, and the stroke of the piston 21. Becomes smaller and the discharge capacity becomes smaller. On the contrary, if the pressure in the crank chamber 10 is lowered, the discharge capacity increases.

  In this embodiment, as shown in FIGS. 2 to 4, the discharge chamber 34 is placed in a direction perpendicular to the fluid traveling direction in the discharge chamber 34 that is a space on the center side of the rear head 4. In FIG. 2, a partition wall 40 is formed that is partitioned into two chambers in the vertical direction. As shown in FIG. 2, each of the chambers partitioned by the partition wall 40 includes three discharge holes 31 (in FIG. 4, the description of the discharge holes 31 is omitted). Further, the partition wall 40 is provided with a communication hole 41 for communicating the two chambers, and the communication hole 41 is formed in an arch shape at the center of the partition wall 40 as shown in FIG. .

  With the above configuration, as shown in FIG. 5, when a pulsation wave is generated from the discharge hole 31 in one chamber 45, the presence of the communication hole 41 causes the other chamber 46 to function as an expansion muffler to attenuate the pulsation wave. Can be made. Thereby, noise can be reduced without increasing the size of the compressor and increasing the manufacturing cost.

  Hereinafter, other embodiments of the present invention will be described with reference to the drawings. However, the same or similar portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  In the compressor according to the second embodiment, as shown in FIG. 6, a part of the partition wall 50 formed in the discharge chamber 34 that is a space on the center side of the rear head 4 is bent and provided. . By doing in this way, it has the same pulsation reduction effect as the said Example 1, and it can avoid that the partition 50 interferes with the discharge hole 31, a fixing member, etc. FIG.

  In the compressor according to the third embodiment, as shown in FIG. 7, the entire partition wall 60 formed in the discharge chamber 34 that is a space on the center side of the rear head 4 is bent and provided. Even with such a shape, the same effect as in the second embodiment can be obtained.

  In the first to third embodiments, the configuration in which the space on the center side of the rear head 4 is the discharge chamber has been described. However, the present invention is not limited to this and may be a suction chamber. Moreover, in the said Examples 1-3, although the compressor which has a swash plate mechanism was demonstrated, this invention is not limited to this.

  As described above, according to the present invention, it is possible to provide a compressor in which noise is reduced without causing an increase in size and an increase in manufacturing cost.

FIG. 1 is a cross-sectional view illustrating the structure of a compressor according to Embodiment 1 of the present invention. FIG. 2 is a diagram illustrating the structure of the rear cylinder head (rear head) according to the first embodiment. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a schematic diagram for explaining the structure of the rear head according to the first embodiment. FIG. 5 is a schematic diagram for explaining the operation of the partition walls and the communication holes according to the first embodiment. FIG. 6 is a schematic diagram for explaining the structure of the rear head according to the second embodiment. FIG. 7 is a schematic diagram for explaining the structure of the rear head according to the third embodiment.

Explanation of symbols

1 Compressor 2 Cylinder Head 3 Valve Plate 4 Rear Cylinder Head (Rear Head)
5 Front cylinder head (front head)
DESCRIPTION OF SYMBOLS 10 Crank chamber 11 Drive shaft 12 Swash plate mechanism 20 Bore 21 Piston 30 Suction hole 31 Discharge hole 33 Suction chamber (outer space)
34 Discharge chamber (center side space)
36 Suction valve 37 Discharge valve 40, 50, 60 Bulkhead 41 Communication hole

Claims (4)

A cylinder block provided with a bore defining a fluid compression chamber, and a cylinder head provided to seal an end surface of the cylinder block;
The cylinder head has a central side space defined at a central portion thereof and an outer space defined so as to surround the central side space, and the central side space and the outer space are respectively provided in the compression chamber. In a compressor that communicates with
A compressor comprising: a partition that divides the central space into two chambers in a direction perpendicular to a fluid traveling direction; and a communication hole that is formed in the partition and communicates with the two chambers.   2. The compressor according to claim 1, wherein the central space is a discharge chamber that stores a compressed fluid, and the outer space is a suction chamber that stores a fluid before compression.   2. The compressor according to claim 1, wherein the central space is a suction chamber in which fluid before compression is accommodated, and the outer space is a discharge chamber in which fluid after compression is accommodated.   The compressor according to any one of claims 1 to 3, wherein the partition wall has a bent shape.

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