JPS641670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating compressor, and an object thereof is to prevent noise caused by suction pulsation.

In general, in a reciprocating type compressor, suction pulsations occur in the cylinder bore due to the intermittently repeated suction stroke through the reciprocating motion of the piston. For example, in the case of a swash plate type compressor, this suction pulsation goes against the suction path and is transmitted to the evaporator through the suction port, suction chamber, suction passage, swash plate chamber, and suction pipe, causing noise in the passenger compartment. This results in the problem of causing the problem.

As a solution to the above problems, a throttle hole is provided in the flow path of the refrigerant gas, and the pressure pulsation is damped by throttling and expanding the pressure pulsation through the throttle hole. In other words, side covers are provided at both ends of the cylinder block, the inside of the rear side cover is partitioned in the axial direction by a partition member, and a discharge chamber and a silencing chamber are separated by an annular partition wall protruding from the partition member. form a section,
A method has been proposed for attenuating pressure pulsations by communicating the muffling chamber and the discharge chamber through a small hole bored in a partition member (Japanese Patent Application Laid-open No. 69476/1983).

However, in the case of the above-mentioned silencing mechanism, the volume of the compressor itself is increased by providing a separate partition member and partitioning the discharge chamber and the silencing chamber by the partition member. However, this leads to problems such as increased manufacturing costs and reduced ease of installation, and by providing the partition member separately in this way, it is necessary to achieve sufficient mold accuracy for the side cover and the partition member. In addition, there is a problem in that the number of assembly steps increases.

The present invention attempts to improve the above-mentioned problems by dividing the inside of the suction chamber by a partition plate formed integrally with the gasket, and by opening a throttle hole in the partition plate. By doing so, it is possible to attenuate pressure pulsations on the suction side, and it is also possible to obtain a compressor that is compact and has excellent airtightness, workability, and ease of assembly.

That is, the present invention provides an arrangement in which the interior of the suction chamber, which can be freely retracted through the cylinder bore and the suction valve, is interposed between the cylinder block forming the cylinder bore and the housing forming the suction chamber, and integrated with the gasket. The formed partition plate divides the compressed fluid into small chambers arranged in series in the flow direction, and
The small chambers are interlocked with each other through throttle holes formed in the partition plate, and the inner wall surface of the housing is bulged so as to face the opening of the suction passage, and the opening area of the suction passage is increased by the bulge. The gist of this is to narrow it down to the following.

Specific embodiments of the present invention will be described below with reference to illustrative drawings.

1 to 4 are diagrams showing the state in which the present invention is implemented in a swash plate compressor, and in the figure, 1
indicates a cylinder block. The cylinder block 1 is composed of a front cylinder block 1F and a rear cylinder block 1R. A shaft hole 2' is provided through the center of the cylinder block 1, and a drive shaft 2 is rotatably supported in the coaxial hole 2'. Further, five bores 3 are provided on the outer periphery of the coaxial hole 2' so as to surround the coaxial hole 2'. Each bore 3 is divided into a front and rear pair with a swash plate chamber 4 in between, and a double-headed piston 5 is fitted into each of the front and rear pairs of bores 3. A swash plate 6 is provided in the swash plate chamber 4 so as to be swingable and rotatable via the drive shaft 2 . The oscillating rotation of the swash plate 6 is transmitted through the shoe 7 and the ball 8 to each piston 5...
is transmitted as a reciprocating motion. Further, the cylinder block 1 is provided with suction passages 9, 9 which also serve as through holes for tightening bolts 23, which will be described later. One end of the suction passages 9, 9 communicates with the swash plate chamber 4, and the other end communicates with a suction chamber 17, which will be described later.

10F is a front valve plate attached to the open end of front cylinder block 1F, 1
0R is a rear valve plate that is also attached to the open end of the rear cylinder block 1R,
Both valve plates 10F and 10R have each bore 3...
A suction port 11 and a discharge port 12 are provided corresponding to the open end of the pump. The suction port 11 is located near the outer periphery, and the discharge port 12 is located inside the suction port 11. 11' is a suction valve, and 12' is a discharge valve. Also, 13 is a valve plate 10F,
10R indicates an opening provided in the center corresponding to the drive shaft 3, and 14 indicates an opening provided in correspondence to the suction passage 9, respectively.

15F is a front housing that covers the end of the front cylinder block 1F with the front valve plate 10F and a gasket 16 (described later) in between, and 15R is a front housing that covers the end of the front cylinder block 1F with the front valve plate 10R and gasket 16 in between. The rear housings covering the ends are shown respectively. Both housings 15F, 15R
is provided with a suction chamber 17 corresponding to the suction port 11, and also corresponding to the discharge port 12,
A discharge chamber 18 is provided. The suction chamber 17 and the discharge chamber 18 are arranged concentrically with an annular partition wall 19 therebetween. Further, a sub-oil reservoir chamber 50 is formed in the center of both housings 15F, 15R with an annular partition wall 20 between the housings 15F and 15R. Both suction chambers 1
7, 17 are provided with bulging portions 21, 21 at positions corresponding to the suction passages 9, 9, and the bulging portions 21
A throttle portion 22 is formed between the opening end of the suction passage 9 and the opening end of the suction passage 9. Of both the bulging parts 21, 21, one bulging part 21 has a through hole 24 for a tightening bolt 23,
A recess 24' is formed into which the head of the bolt 23 fits. Further, the other bulging portion 21 is provided with a screw hole 25, and a tightening bolt 23 is inserted into the screw hole 25.
By screwing together, cylinder block 1
F, 1R, valve plates 10F, 10R, and housings 15F, 15R are integrated.

The gasket 16 described above is provided with three concentric seal portions 26, 27, 28 corresponding to the outer circumferential wall 15' of the housing 15 and the partition walls 19, 20. The space between them is connected by five ribs 29. Each rib 29...
are provided at positions corresponding to the discharge port 12, and each rib 29 is bent and deformed into a substantially V-shape toward the discharge chamber 18, thereby forming a stopper 30 of the discharge valve 12'.

A partition plate 31 that fits into the suction chamber 17 is integrally provided with the gasket 16. The partition plate 31 is provided between the seal portions 26 and 27 in correspondence with the suction port 11, and the partition plate 31 separates the suction chamber 17 in the flow direction of the compressed fluid into the respective cylinder bores 3. It is divided into small chambers in series. The partition plate 31 has a pair of left and right leg pieces 31', 31' that stand up at right angles to the surface of the gasket 16 at both ends along the circumferential direction, and a partition piece 31'' that connects both leg pieces 31', 31'. The partition piece 31'' has a gate-shaped cross section.The partition piece 31'' has the same arc as both the inner and outer walls of the suction chamber 17, and is formed into a fan shape.The partition piece 31'' is provided with a throttle hole 32, Hole 3
2 communicates the small chambers arranged in series with each other. 33 is both seal parts 26, 27
An opening provided in correspondence with the suction passage 9 and the suction hole 14 is shown in between.

Next, its operation will be explained. Reciprocating motion is applied to each piston 5 through the rocking rotation of the swash plate 6. In the forward stroke of each piston 5, the refrigerant gas passes through the evaporator, the suction pipe (none of which is shown), the swash plate chamber 4, the suction passage 9, the suction chamber 17, and the suction port 11, and then passes through the bore 3.
On the other hand, the refrigerant gas sucked into the bore 3 passes through the discharge port 12, the discharge chamber 18, and the discharge pipe (not shown) during the backward stroke of each piston 5, and then enters the condenser (not shown). sent towards.

Therefore, in the suction stroke, the suction pulsation that occurs is an expansion obtained in the process of passing through the throttle hole 32 opened in the partition plate 31, an expansion obtained in the process of passing through the throttle part 22 while being attenuated through the throttle action, It is further attenuated by the throttling action. Figures 5 and 6 are charts showing the results of experiments in which noise was measured near the evaporator (inside the vehicle interior).
In both the experiments using the characteristics (Figure 5) and the experiments using the A characteristics (Figure 6), the sound pressure level decreased overall, and especially in the low frequency range (300~
The peak value at 600Hz) was significantly reduced, and a better effect than the conventional product was obtained. In both figures, the experimental results of this example are shown by solid lines, and the experimental results of the conventional product are shown by dashed lines.

The present invention is constructed as described above, and includes:
As described above, a partition plate integrally formed with the gasket is provided inside one or both of the suction chamber and the discharge chamber, and the flow path of the refrigerant gas is narrowed through the throttle hole formed in the partition plate. This has made it possible to prevent noise caused by suction pulsation and suction pulsation due to the muffler effect of the throttle section. In particular, by forming the partition plate integrally with the gasket, it is not only easy to process and assemble the silencing mechanism, but also a compressor that is compact and has excellent airtightness. Ivy.

In addition, if the compressor is started and the refrigerant gas remains in a liquefied state in the suction path and the liquid is sent into the bore, the refrigerant gas will be compressed in a liquefied state, and the same will occur. This will generate abnormally high pressure in the bore, but in the present invention, the inner wall surface of the housing is bulged so as to face the suction passage or the discharge passage, and the bulged portion is used to prevent the suction passage or the discharge passage from flowing. By constricting the opening area of the passage, the refrigerant gas in the liquefied state can be atomized through the expansion and throttling action in the constricted portion.
This makes it possible to prevent liquid compression within the bore, that is, the generation of abnormally high pressure.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the swash plate compressor, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is a front view of the gasket, and Fig. 4 is a sectional view taken along line A-A in Fig. 3. . Further, FIGS. 5 and 6 show diagrams representing the experimental results. 1... Cylinder block, 2... Drive shaft,
2'...Shaft hole, 3...Bore, 4...Swash plate chamber, 5...
...Piston, 6...Swash plate, 7...Show, 8...
Ball, 9...Suction passage, 10...Valve plate, 11...Suction port, 11'...Suction valve, 12...
...discharge port, 12'...discharge valve, 13...opening,
14...opening, 15...housing, 16...
Gasket, 17...Suction chamber, 18...Discharge chamber,
19, 20... partition, 21... bulge, 22...
Restricted portion, 23...Tightening bolt, 24...Through hole, 24'...Recess, 25...Threaded hole, 26,2
7, 28... Seal part, 29... Rib, 30...
Stopper, 31... Partition plate, 31'... Leg piece,
31″...Partition piece, 32...Aperture hole, 33...
Opening, 50...auxiliary oil sump chamber.

Claims (1)

[Claims] 1. A partition integrally formed with a gasket, interposing the interior of the suction chamber which can be freely refilled via the cylinder bore and the suction valve, at the portion where the cylinder block forming the cylinder bore and the housing forming the suction chamber are in contact with each other. A plate divides the chamber into small chambers arranged in series in the flow direction of the fluid to be compressed, and a throttle hole drilled in the partition plate allows the small chambers to communicate with each other, while the inner wall surface of the housing is bulged to face the suction passage. A reciprocating compressor characterized by: