JPH0540302Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to an internal temperature reduction structure for a swash plate type compressor in which a swash plate chamber that houses a swash plate that drives each piston housed in a plurality of cylinder bores also serves as a passage for suctioned refrigerant.

[Prior Art] Generally, as shown in FIG. 5, a swash plate compressor has a pair of left and right cylinder blocks 1 and 2, each having a plurality of cylinder bores 1a and 2a, facing each other to form a swash plate chamber 3. A front housing 4 and a rear housing 5 are connected to both ends of the blocks 1 and 2, and these are connected to the cylinder blocks 1 and 2.
Bolt insertion hole 1 that also serves as a suction passage near the outer periphery of
b, 2b are connected by a plurality of bolts 6 inserted through them. Both housings 4 and 5 have partition walls 4a and 5a.
Discharge chambers 7, 8 are formed on the inside, and suction chambers 9, 10 are formed on the outer circumferential side so as to surround the discharge chambers 7, 8. is communicated with. The swash plate chamber 3
A swash plate 12 fixed to a drive shaft 11 passing through the cylinder blocks 1 and 2 is accommodated therein, and a piston 1 accommodated in each of the cylinder bores 1a and 2a.
3 is reciprocated via the shoe 14 as the swash plate 12 rotates. Then, the refrigerant gas swash plate 3 is sucked in from the suction port 15 formed in the cylinder block 2 → the bolt insertion holes 1b, 2
b → Suction chambers 9, 10 → Cylinder bores 1a, 2a →
It flows through the discharge chambers 7 and 8 in this order, and is sent to the condenser of the cooling circuit via a discharge muffler (not shown).
The refrigerant gas flowing into the swash plate chamber 3 from the suction port 15 has the effect of cooling the piston 13. However, since there is only one suction port 15, the flow of refrigerant gas flowing into the swash plate chamber 3 is not uniform, resulting in uneven temperature distribution within the swash plate chamber. 2a
In this case, the temperature of the discharged gas becomes high.

In order to solve this problem, Japanese Patent Application Laid-Open No. 56-23583 discloses that, as shown in FIG. A continuous annular suction refrigerant passage 16 is provided in the swash plate chamber 3, and
It has been proposed that the bolt insertion holes 1b, 2b that communicate the swash plate chamber 3 and the suction chambers 9, 10 have a larger diameter as they are located farther from the suction port 15. Further, Japanese Utility Model Publication No. 52-58804 discloses a cylinder block 1, 2 in which two suction ports 15 are provided along the axial direction of the cylinder bore, as shown in FIG.

[Problem to be solved by the invention] However, in the case of the device shown in FIG. Although the temperature difference between the discharged gas and the discharged gas is made to flow relatively evenly in chambers 9 and 10,
Since the flow of refrigerant gas flowing into the swash plate chamber 3 from the suction port 15 is biased toward the suction port 15 side and is not uniform, the temperature inside the swash plate chamber at a position far from the suction port becomes high, and the temperature corresponds to the piston 13 at that position. The discharged gas discharged from the cylinder bores 1a and 2a becomes high in temperature. As a result, there is a problem that not only components in high-temperature portions undergo thermal deterioration quickly, but also the compression efficiency in the high-temperature cylinders becomes low and the compression efficiency in each cylinder becomes non-uniform. Furthermore, even when two suction ports 15 are provided, since the suction ports 15 are provided along the axial direction of the cylinder bores with respect to the cylinder blocks 1 and 2, the refrigerant gas flowing into the swash plate chamber from the suction ports 15 is After all, the flow remains biased, and there is almost no effect of uniformizing the temperature distribution within the swash plate chamber.

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to create a swash plate type that can equalize the gas temperature in the swash plate chamber, which affects the temperature of the refrigerant gas sucked into each cylinder bore. The object of the present invention is to provide a structure for reducing the internal temperature of a compressor.

[Means for solving the problem] In order to achieve the above-mentioned purpose, in the present invention,
In a swash plate compressor in which a swash plate chamber that accommodates swash plates that drive each piston housed in a plurality of cylinder bores also serves as a passage for suction refrigerant, the cylinder block has an opening that connects a refrigerant gas suction port to the swash plate chamber. They were provided at two locations located on both sides of a plane containing the axis of the drive shaft.

[Operation] In the present invention, the refrigerant gas introduced into the compressor flows into the swash plate from the openings of the suction ports provided on both sides of the plane containing the axis of the drive shaft. The refrigerant gas flows so that it hits the pistons housed in each cylinder bore under almost the same conditions, making the temperature in the swash plate chamber uniform, and each piston is evenly cooled by the refrigerant gas, making the refrigerant gas temperature in the cylinder bores uniform. be converted into

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS. 1 and 2. The device of this embodiment differs from the conventional device in the position of the suction port and the opening location, but the other structure is basically the same as the conventional device, and the same parts are given the same reference numerals and explanations will be omitted. . As shown in FIG. 1, the suction port 15 is provided in the front cylinder block 1, and the second
As shown in the figure, they are arranged on the same circumference along the outer peripheral surface of the swash plate chamber 3, and the openings 15a thereof are formed on both sides with one cylinder bore 1a in between. Further, a discharge port 18 is provided in the rear cylinder block 2.

Next, the operation of the apparatus configured as described above will be explained. The refrigerant gas sucked in from the suction port 15 flows into the swash plate chamber 3 while passing both sides of the piston 13 housed in the cylinder bore 1a, as shown by the arrow in FIG. move towards. Each cylinder bore 1a, 2a
Since the angles formed between the centers of adjacent ones and the axis of the drive shaft 11 are equal, the refrigerant gas flowing in from the two openings 15a flows so as to contact each piston 13 equally, and the refrigerant The cooling effect of the piston 13 by the gas is made uniform.
Therefore, thermal deterioration of components due to localized high temperatures is eliminated, heat resistance is improved, and reliability is improved. In addition, bolt insertion holes 1b and 2 are inserted from the swash plate chamber 3.
b, cylinder bores 1a, 2 via suction chambers 9, 10
The temperature of the refrigerant gas flowing into the cylinder a is also made uniform, and the temperature of the discharged gas from each cylinder (cylinder bore) becomes equal, improving the efficiency of the compressor. Furthermore, the resistance to the inflow of refrigerant gas into the swash plate chamber 3 is reduced, gas heating of the piping connecting the compressor and evaporator is reduced, and as a result, the temperature reduction effect within the swash plate chamber 3 is improved.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, as shown in FIG. 3, the suction ports 15 may be formed on both the left and right sides with the discharge passage 17 interposed therebetween. Even in this case, the refrigerant gas flowing in from the opening 15a of the suction port 15 still flows so as to uniformly cool each piston 13.
The temperature within the swash plate chamber 3 is made uniform. Furthermore, when the suction port 15 is formed across the discharge passage 17 in this way, the volume of the portion of the cylinder block 2 that bulges out to the outside to form the suction port 15 becomes smaller than in the case of the above embodiment. . Further, the suction port 15 does not need to have two inlets to which piping connected to the evaporator is connected, and may be configured to have one inlet and branch in the middle to have two openings 15a. Furthermore, instead of providing the suction ports 15 on the same circumference orthogonal to the drive shaft 11, they may be arranged one behind the other as shown in FIG.

[Effects of the invention] As detailed above, according to the invention, refrigerant gas flows into the swash plate chamber from the suction port through the two openings located on both sides of the plane containing the axis of the drive shaft. Because of this, the pistons in the swash plate chamber are cooled uniformly, the temperature in the swash plate chamber is made uniform, and there are no localized hot spots, which prevents deterioration of parts and improves reliability.
There is no variation in the temperature of the discharged gas from each cylinder, and the efficiency of the compressor is improved.

[Brief explanation of drawings]

Fig. 1 is an assembled perspective view of a cylinder block according to an embodiment of the present invention, Fig. 2 is a sectional view, and Fig. 3 is an assembled perspective view of a cylinder block according to an embodiment of the present invention.
The figure is a perspective view of the rear cylinder block of a modified example, Figure 4 is a plan view of another modified example, Figures 5 and 6 are sectional views of the conventional device, and Figure 7 is a plan view of another conventional device. be. Cylinder block...1, 2, cylinder bore...
...1a, 2a, swash plate chamber...3, drive shaft...11,
Swash plate...12, Piston...13, Suction port...
...15, opening...15a.

Claims (1)

[Scope of utility model registration request] In a swash plate compressor in which a swash plate chamber that accommodates swash plates that drive each piston housed in a plurality of cylinder bores also serves as a passage for suction refrigerant, the cylinder block has an opening that connects a refrigerant gas suction port to the swash plate chamber. The internal temperature reduction structure of a swash plate compressor is installed at two locations on both sides of a plane that includes the axis of the drive shaft.