JPH039085A - Swash plate type compressor - Google Patents

Abstract

PURPOSE:To maintain proper oil temperature at all times and obtain good lubrication performance by liquefying a part of refrigerant gas in a delivery chamber, then introducing the liquefied gas to a swash plate chamber or an oil chamber in air liquid mixture state, and finally gasifying the liquid refrigerant therein for a cooling purpose. CONSTITUTION:When a pump 15 is operated with the turn of a drive shaft 9, oil sucked from an oil chamber 16 to a pump chamber 10 is fed to a thrust bearing 11 via an oil feed passage 20, and then splashed into a swash plate chamber 7. On the other hand, refrigerant gas is fed from a suction chamber 21 to a compression chamber 22 on the operation of a piston 13, and then flows from a delivery chamber 23 to a cooling chamber 24 via a passage via an inlet 25. Thereafter, the gas is cooled and liquefied. Furthermore, the liquid refrigerant is partly gasified and cooled at a throttle part 26a at the outlet 26 of the cooling chamber 24, and then flows into the swash plate chamber 7 via a communication passage 27. As a result, the swash plate chamber 7 is cooled with the liquefied refrigerant and further cooled as the refrigerant is gasified.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application 1. The present invention provides a cylinder block with pistons which are housed in a plurality of cylinder bores formed in cylinder tabs 1:'7 with 11 reciprocating sliding openings, so as to be freely rotatable in a cylinder block. The swash plate chamber, which accommodates the swash plate, is provided independently of the circuit for the refrigerant sludge introduced into the suction chamber. At the same time, lubrication of the thrust I~bear link etc. housed in the swash plate chamber is installed below the swash plate chamber G-J.
The present invention relates to a swash plate type pressure fI machine which is operated by the oil in the oil storage chamber.

[Prior art-1] This persimmon swash plate compressor has pulp plates 3.2 at both ends of mutually connected cylinder cylinders 1.2, as shown in FIG. -1 and 7) are closed by the zinc 5 and the rear housing 6. Yes. Sirinta Pro Nku 12
A swash plate chamber 7 is formed at the joint portion of the swash plate chamber 7, and the swash plate chamber 7 has a shaft hole 1a installed at the center of both cylinder tabs 1 and 2.
A swash plate 10 is housed in a state in which it is fitted into a drive shaft 71 rotatably supported by a radial hair link 8 at 2a. A thrust bearing 11 is interposed between both end surfaces of the boss portion 1021 of the ♀l plate 10 and the cylinder knob 17 and the ring 12, and the thrust bearing 11 is interposed between the end surfaces of the boss portion 1021 of the above-mentioned ♀l plate 10 and the cylinder bore 17 and the ring 12. As the plate 10 rotates, it is reciprocated and compressed. In order to lubricate the thrust bearing 11 and the shoes 14, an oil pump 15 that is operated by the rotation of the drive shaft 9 is installed in the rear housing 6.
6 to the pump chamber 19 via the oil supply pipe 17 and the suction passage 18.
A forced lubrication system is often adopted in which oil is pumped up inside the drive shirt 1-9 and supplied to the thrust bearing 11 from an oil supply passage 20 formed in the drive shirt 1-9.
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In a swash plate type compressor, it is preferable that the pressure inside the swash plate chamber 7 is equal to the pressure on the suction side.
The pressure inside increases. The swash plate chamber 7 and the suction chamber 21 are in communication via the gap between the radial bearings 8, but this alone is insufficient to make the differential pressure between them O, so generally the swash plate chamber 7 and the suction side of the refrigerant circuit are connected to each other. That is, a balance hole (not shown) communicating with the suction chamber 21 or the suction passage is formed.

[Invention or Problem to be Solved] However, in the forced refueling method, the swash plate chamber 7 is independent from the refrigerant circuit and does not serve as a passage for low-temperature suction refrigerant gas. 11 The temperature inside the swash plate chamber 7 and the oil storage chamber 16 increases due to the effect of heat contraction. When the temperature inside the swash plate chamber 7 and the oil retention chamber 16 becomes high, the viscosity of the oil decreases by 1.'' and the lubricating properties deteriorate, but a film forms on the sliding surfaces of the cylinder bore 12 and the piston 13. As a result, the ability to maintain the sweat contraction chamber 22 in a sealed state also decreases.

Then, the oil in the swash plate chamber 7 easily enters the sweat compression chamber 22, and the oil that entered the compression chamber 22 is transferred from the storage chamber 23 together with the refrigerant gas to the cooling circuit, which is installed in the cooling circuit. There was a problem that it adhered to the evaporator etc. and had an adverse effect. In addition, when the refrigerant scum leaked into the swash plate chamber 7 at L■ and IL'g is sucked, it is transferred from the swash plate chamber 7 to the constriction chamber 22.
There is also the problem that the amount of refrigerant sludge sucked decreases and the compression efficiency decreases.

The present invention has been made in view of the above problems, and includes:
The purpose of this is to prevent high temperatures in the swash plate chamber and oil storage chamber, to maintain the lubricating properties of the lubricating oil at all times, and to lubricate each part well.
An object of the present invention is to provide a swash plate compressor that can prevent refrigerant gas from leaking from a swash plate chamber 7 into a compression chamber 22 during suction.

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the present invention, a piston is housed in a plurality of cylinder bores formed in a cylinder block so as to be slidable back and forth, and the piston is rotatably housed in the cylinder block. The swash plate is reciprocally driven via a swash plate mounted on a supported drive shaft, and a swash plate chamber housing the swash plate is provided independently of a refrigerant gas circuit introduced into the suction chamber. In a swash plate compressor in which thrust bearings, etc., are lubricated by oil in an oil storage chamber provided in the swash plate chamber, a passage connecting the outlet chamber and at least one of the swash plate chamber or the oil retention chamber. was arranged along the outer wall of the housing, and a throttle portion was provided in the swash plate chamber or oil storage pen of the passage.

[Function] In the swash plate compressor of the present invention, a part of the refrigerant gas discharged into the discharge chamber passes through the passage connecting the discharge chamber and at least one of the swash plate chamber and the oil storage chamber and enters the swash plate chamber or the oil storage chamber. be guided. Since the passages are arranged along the outer wall of the housing, the refrigerant gas is cooled and liquefied while passing through the passages. When the liquefied refrigerant passes through the throttle part, the - part is vaporized, and the heat of vaporization is taken away, resulting in a low temperature of the refrigerant. blown into the room. The refrigerant blown into the swash plate chamber or the oil storage chamber is vaporized within the swash plate chamber or the oil storage chamber, and at this time, the swash plate chamber or the oil storage chamber is cooled to remove heat of vaporization from the surroundings.

[Embodiment 11-6 Hereinafter, a first embodiment embodying the present invention will be described with reference to FIGS. 1-2. Note that the same parts as those of the conventional device are given the same reference numerals, and the description thereof will be omitted.

In the rear housing 6, between the suction chamber 21 and the outer wall of the housing, a cooling chamber 24 is formed along the outer wall, and constitutes a passage connecting the field chamber 23 and the swash plate chamber 7. The cooling chamber 24 is formed into a substantially circular shape corresponding to the end surface of the suction chamber 21, and has an inlet 25 communicating with the discharge chamber 23 at its top end, and an outlet 26 at its lower end. There is a constriction part 2 at the end of the 126
6a is formed. Cylinder block 2 on side A
And the valve plate 4 has a communication R2 that corresponds to the constriction part 26a of the above-mentioned 26 at one end and opens into the swash plate chamber 7 at the other end.
7 is formed. The cooling chamber 2 of the rear housing 6
The outer wall corresponding to /] is formed separately from a material with good thermal conductivity, and a large number of fins 28 are formed on its surface. In addition, the front housing 5 has a swash plate chamber 7 and freon 1 to
A balance hole 29 is formed which communicates with the side suction chamber 21, and an oil separation chamber 30 is formed in the middle of the two balance holes.

Next, the operation of the swash plate compressor constructed as described above will be explained. By rotating the drive shaft (foot 9), the oil pump 1 is
5 is activated, the oil pumped from the oil lri' storage chamber 1 () to the pump chamber 19 is supplied to the thrust bearing 11 through the oil supply passage 20, and is also supplied to the swash plate chamber 7 through the thrust bearing 11. The thrust bearing 11 and the shoe 14 are lubricated by the lubrication of the thrust bearing 11 and shoe 14.

After being sucked from the suction chamber 21 into the 1'' line 22 by the reciprocating movement of the piston 13 and subjected to sweat shrinkage c-t,
A part of the refrigerant scum discharged into the discharge chamber 23 enters the cooling chamber 24 through the inlet 125. Since the cooling chamber 24 is formed along the outer wall, heat is easily radiated to the outside, and since it is close to the suction chamber 21 into which low-temperature refrigerant gas is introduced, the refrigerant gas that enters the cooling chamber 24 is cooled. The refrigerant cools down and liquefies, and the liquid refrigerant accumulates in the lower part of the cooling chamber 24. Part 1. te, out,
-, 126 and the communication passage 27 into the swash plate chamber 7. When the liquid refrigerant passes through the constricted portion 268, a portion of the liquid refrigerant vaporizes, and at this time, the heat of vaporization is renewed, and the temperature becomes lower than that of the refrigerant, and enters the swash plate chamber 7 in this state. The swash plate chamber 7 is cooled by introducing low-temperature cold water into the swash plate chamber 7. Further, the liquid refrigerant that has entered the swash plate chamber 7 is vaporized within the swash plate chamber 7, and at this time, it is cooled from the swash plate chamber 7 in order to remove the heat within the swash plate chamber 7. By cooling the swash plate chamber 7, the lubricating oil in the swash plate chamber 7 is not heated to a temperature at which its lubrication properties become poor, and the oil lubricates each part favorably. The refrigerant scum introduced into the swash plate chamber 7 is sent to the suction chamber 21 on the front side through the oil separation chamber 30 and the balance hole 29. The mist-like oil that moves together with the refrigerant scum is reliably separated from the refrigerant scum when it passes through the oil separation chamber 30, and the mist-like oil does not enter the suction chamber 21.

[Embodiment 2I Next, the second embodiment will be explained according to 3rd, 4th and 1-) In this embodiment, the cooling chamber 24 is not formed in a simple circular shape, but a large number of holes are formed in the cooling chamber 24. The fins 2451 are provided protrudingly. In this embodiment, the refrigerant scum introduced into the cooling chamber 2.1 from the inlet 125 is discharged from the outlet [112].
6 becomes longer, the contact area with the refrigerant scum in the cooling chamber 24 becomes larger, and the cooling effect becomes higher.

Note that the present invention is not limited to the two embodiments described above, and for example, the end of the communication passage 27 may be configured to open to the oil storage chamber 16 instead of opening to the swash plate chamber 7, or the end of the communication passage 27 may be opened to the oil storage chamber 16. The oil pump 15ζ
Instead of pumping up the oil and supplying it to the thrust 1 to bearing 11, the swash plate 10 directly stirs the oil and supplies it to the swash plate chamber 7.
Even if it is applied to a forced lubrication system configured to lubricate the thrust bear link 11 and the like by scattering oil inside the bearing, it is still too long.

[Effects of the Invention] As described in detail below, according to the present invention, after a part of the refrigerant gas discharged into the discharge chamber is cooled and liquefied, the refrigerant gas is discharged into the swash plate chamber or the oil "in a gas-liquid mixed state." The liquefied refrigerant is guided into the reservoir chamber 0 and vaporized in the swash plate chamber or oil storage chamber. At this time, the swash plate chamber or oil storage chamber is cooled to remove the heat of vaporization from the surroundings, and the lubricating oil The lubricating properties of the lubricating oil are maintained well at all times, ensuring good lubrication of all parts, and the leakage of refrigerant gas from the swash plate chamber into the compression chamber during suction. Is it possible to prevent this?

[Brief explanation of the drawing]

1 and 2 show an example embodying the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. FIG. 4 is a partial cross-sectional view of two actual repair examples, FIG. 4 is a cross-sectional view taken along the line B--B in FIG. 3, and FIG. 5 is a cross-sectional view of a conventional apparatus. Cylinder blocks 1, 2, rear housing 6, swash plate chamber 7
, drive shaft 9, swash plate 10, thrust bearing 11
, cylinder bore 12, screw l~n 13, oil pump 1
5. Oil storage chamber 16, suction chamber 21, discharge chamber 23, cooling chamber 24 forming a passage. Communication path 27, outlet 26, throttle part 26a, fin 28, balance hole 29, oil M chamber 3o.

Claims (1)

[Claims] 1. Pistons housed in a plurality of cylinder bores formed in the cylinder block so as to be able to reciprocate and slide are reciprocally driven via a swash plate installed on a drive shaft rotatably supported by the cylinder block, and the swash plate A swash plate chamber housing the swash plate chamber is provided independently from the refrigerant gas circuit introduced into the suction chamber, and the thrust bearings etc. housed in the swash plate chamber are lubricated by oil in an oil storage chamber provided below the swash plate chamber. A swash plate type compressor in which a passage connecting the discharge chamber and at least one of the swash plate chamber or the oil storage chamber is arranged along the outer wall of the housing, and a throttle part is provided in the passage near the swash plate chamber or the oil storage chamber. compressor.