JPH0219688A - Horizontal enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the size of an oil supply means by providing a means for supplying lubricant from a lower enclosed container to an oil supply path through utilization of static pressure drop in a crankshaft or a bearing due to high speed passage of refrigerant. CONSTITUTION:Gas delivered through driving of a compressor passes through a path 18 arranged in a compressor element 3 and delivered into an enclosed container 1, and since the cross-section of the path 18 is smaller than that of a delivery muffler 12 the flow speed of gas increases. At this time, dynamic pressure of delivery gas increases to lower the static pressure correspondingly, the static pressure in the container 1 drops below that in the path 18. When the path 18 is communicated with an oil supply path 13 and the space at the communicating section is separated from the enclosed container 1, the static pressure in the oil supply path 13 drops. Consequently, lubricant 17 is sucked from the bottom of the enclosed container 1 and supplied to an oil supply hole 4a in a crankshaft 4 thus lubricating bearing sections.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a horizontal hermetic rotary compressor for refrigeration and air conditioning. In particular, it relates to lubricating oil supply means.

[Conventional technology]

FIG. 9 is a vertical sectional view of a conventional hermetic rotary compressor shown in, for example, Japanese Utility Model Publication No. 57-26067, and FIG.
In the XX-X cross-sectional view of the figure, (1) in Figure 91 is a closed container.
Inside this airtight container (1), there is an electric element (2) and a compression element (3).
) are housed therein, and both are connected by a crankshaft (4). Then, the refrigerant gas is sucked into the cylindrical cylinder (5) through the suction hole (not shown) and flows into the piston (
6) After being compressed in a compression chamber consisting of a vane (7), a cylinder head (8) and a frame (9),
Discharge valve (through IG, discharge muffling chamber α2 inside discharge pillow α)
The compressed refrigerant gas in the silencing chamber aZ is intermittently discharged to the silencing chamber aZ and is configured to flow out through a discharge hole (not shown) to a gas cooler (not shown) or directly into the sealed container 111. .

In the hermetic rotary compressor configured in this way, a discharge pipe α3 is provided here. This discharge pipe α
3 is connected at one end to the discharge silencing chamber α2, and at the other end is connected to the crankshaft (4) self-lubricating hole. Compressed refrigerant gas is flowed in, and this compressed refrigerant gas is discharged into the crankshaft (4) through the discharge pipe αj. In addition, the middle part of the above-mentioned discharge pipe 3 is
It is arranged in an arc shape along the inner periphery of the lower part of the closed container (1), and a plurality of small holes (14+, α9, αG) are bored at predetermined intervals in this arc-shaped part.
Lubricating oil αη is stored in the lower part of the closed container (1).

In a hermetic rotary compressor equipped with the discharge pipe α3 as described above, if it is installed so that the small hole I is at the lowest position in the vertical direction (indicated by arrow a), as shown in FIG. The lubricating oil αη opens into the lubricating oil αη, and the lubricating oil αη flows into the discharge pipe 0 through this small hole α4, and the crankshaft (
4) It is supplied to the inside. That is, from the small hole side immersed in the lubricating oil (Iη), the lubricating oil σ flows into the discharge pipe aj,
This lubricating oil αη is supplied to the crankshaft (4) through the discharge pipe a3 during the discharge stroke due to the impulse overshoot pressure generated in the discharge muffling chamber 03 as compressed refrigerant gas discharge starts from the discharge valve α0. be done. On the other hand, Fig. 13 shows the case where the compressor is rotated and tilted at 90 degrees.
In this case, a small hole (le) is located at the lowest position in the vertical direction, and this small hole Oe opens into the lubricating oil (In). Therefore, in this case as well, the lubricating oil is 1
1? + is now supplied to the crankshaft (4).

In addition, Fig. 12 shows a case where the compressor is tilted to an intermediate position between the two, and in this case, the lubricating oil a
η is similarly supplied to the crankshaft (4).

[Problem to be solved by the invention]

Since the conventional lubrication mechanism is configured as described above, the amount of lubricating oil supplied varies greatly depending on the variation of the discharge gas flow cover. Therefore, the capacity is controlled by changing the rotation speed of the crankshaft (4). In such cases, the amount of lubricating oil η
There were problems such as a situation in which a sufficient amount of fuel was not supplied, and a problem that a large space had to be secured in the closed container because the refueling pipe was long.

This invention was made to solve the above-mentioned problems, and even when a horizontal hermetic compressor is driven in variable speed operation mode, it is possible to ensure a stable oil supply state, save space, and The purpose is to obtain an inexpensive oil supply mechanism.

[Means to solve the problem]

The horizontal hermetic rotary compressor according to the present invention includes a hermetic container, a compression element that is housed in the hermetic container and compresses a refrigerant, and a crankshaft or a bearing that has an oil supply path that supplies lubricating oil to each sliding part of the compression element. a discharge gas passage through which refrigerant gas compressed by the compression element passes at high speed; and a communication hole that communicates the discharge gas passage with an oil supply passage of the crankshaft or bearing.

The discharge gas passage takes advantage of the fact that the static pressure of the refrigerant that passes through it at high speed decreases, and the static pressure of the oil supply passage of the crankshaft or bearing that communicates with the discharge gas passage through the communication hole also decreases. The apparatus further includes an oil supply means for supplying the lubricating oil stored in the lower part of the closed container to the oil supply path of the crankshaft or bearing.

[Effect]

The horizontal hermetic rotary compressor in this invention is:

The lubricating oil stored in the closed container is supplied to the sliding part of the compression element by utilizing the decrease in static pressure in the discharge gas passage.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIG. In the figure, sections (1) to 1 are completely the same as the conventional one. In the prisoner, (4a) is the refueling hole, (
4b) is an oil supply hole and a communication hole, and (8a) is an oil groove.

(8b) is a communicating small hole, and aa is a discharge gas passage.

When the compressor is driven, the discharge valve (
The gas discharged through the IQ is sent to the cylinder head (8)
It is formed by a discharge muffler housing υ and expands into a discharge muffling chamber tta, reducing its flow velocity. Then the compressor element (3)
The discharge gas is discharged into the sealed container (1) through the discharge gas passage (I) provided in the chamber, but when passing through the discharge gas passage (S), At this time, the dynamic pressure of the discharge gas increases due to the increase in the flow velocity, and the static pressure decreases accordingly, so the static pressure in the discharge gas passage I is lower than the static pressure in the closed container (1). Therefore, if a structure is formed that communicates this discharge gas passage al with the oil supply pipe αj, and this communication partial volume is formed as a space separated from the inside of the closed container (1), the inside of the oil supply pipe 0 becomes lower. The static pressure of the lubricating oil (+
71 is sucked up and the crankshaft (41 oil supply hole (4a)
).

It functions to lubricate each bearing part through the oil supply hole (4b).

No. 2 (2) is a sectional view showing a second embodiment of the present invention. This is the mechanism adopted in
This Oriais (8C) has a structure that reduces the opening of the
) section increases the discharge gas flow velocity to obtain the static pressure necessary to suck up the lubricating oil αη inside the oil supply pipe (13).

FIG. 3 is a sectional view showing a third embodiment of the invention,
A discharge gas passage α ladder is constituted by a discharge muffler αυ attached to the frame (9) side and a boss portion (9a) of the frame (9). As shown in Fig. 4, the compressed refrigerant that has passed through the discharge valve a1 of the frame (9) is transferred to the frame boss portion (9a).
Because it flows at high speed when passing through the discharge gas passage α♂,
A pressure drop occurs at the hole (9b), which is a communication hole that communicates the oil groove (9) of the bearing with the discharge gas passage U, and the oil groove (4) provided on the outer periphery of the crankshaft (4) decreases. The lubricating oil accumulated in these oil grooves flows through the oil grooves (8a) machined into the bearing part (8d) of the cylinder head (8), and the pressure drop in these oil grooves is further reduced. The oil is attached to the cylinder head (8) by the action.The lubricating oil rises in the oil supply pipe 03 that connects the oil groove (8a) and the lubricating oil aη, which is a reservoir in the closed container (11). In Fig. 4, arrow A indicates the flow of compressed refrigerant, and arrow B indicates the flow of lubricating oil.

5 is a front view of the liquid discharge pillow shown in the embodiment of FIG. 3], and FIG. 6 is a sectional view taken along the line VI--■ in FIG. 5.

FIG. 7 is a sectional view showing a fourth embodiment of the present invention.
In this case, the oil supply pipe connecting the shaft oil groove (8a) and the lubricating oil αη in the closed container (1) is connected to the cylinder head (8).
This is constructed by driving a circular pipe into the boxwood s (8ri).This method not only provides the same effect as the embodiment shown in Fig. 3, but also allows the oil supply pipe αJ in Fig. Since no space is required behind the cylinder head (8), space can be saved.

FIG. 8 shows a fifth embodiment of the present invention, and the ceramic diagram shows:
The compressed refrigerant passes through the discharge valve cover provided in the cylinder head (8) and passes through the discharge muffler (
Flows out from lυ. In this example, the shaft support oil groove (8a)
(The oil supply pipe α3 connecting the oil tank η in the airtight container (11) is attached to both the frame (9) and the cylinder head (8), and is attached to both the frame (9) and the cylinder head (8). For example, even higher refueling capacity can be secured.

〔Effect of the invention〕

The horizontal hermetic compressor according to the present invention includes a hermetic container, a compression element that is housed in the hermetic container and compresses a refrigerant, a crankshaft or a bearing that has an oil supply passage that supplies lubricating oil to each sliding part of the compression element, A discharge gas passage through which the refrigerant gas compressed by the compression element passes at high speed; a communication hole through which the discharge gas passage communicates with the oil supply path of the crankshaft or bearing; and a communication hole through which the refrigerant passes at high speed through the discharge gas passage. The lubricating oil is stored in the lower part of the sealed container by taking advantage of the fact that the static pressure decreases and the static pressure of the oil supply path of the crankshaft or bearing that communicates with the discharge gas passage through the communication hole also decreases. Since the structure includes an oil supply means for supplying oil to the oil supply passage of the crankshaft or bearing, the oil supply means can be made smaller in size compared to conventional oil supply systems.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view showing a first embodiment of the invention;
FIG. 2 is a vertical cross-sectional view of main parts showing a second embodiment of the present invention;
FIG. 3 is a vertical sectional view showing a third embodiment of the present invention, and FIG.
The figure is an enlarged view of the main part of the third embodiment in figure E3, and figure 5 is M3.
FIG. 6 is a front view of the discharge muffler of the third embodiment of the invention, FIG. 6 is a side view of the same, FIG. 7 is a vertical sectional view of the fourth embodiment of the invention, and FIG. 9 is a partial vertical sectional view of a conventional hermetic compressor, FIG. 10 is a sectional view taken along the line X-X in FIG. 9, and FIGS. 11 to 13 are views showing the ninth factor. FIG. 2 is a diagram showing an installation example of a conventional hermetic compressor. In the figure, (1) is a closed container, (3) is a compression element, and (4
) is the crankshaft, (4a) is the oil supply hole, and (8) is the cylinder head. (8a) is an oil groove, (8t)) is a small communication hole, and an is a discharge 77. α2 is the discharge silencing chamber, (13 is the oil supply pipe, the penalty is the lubricating oil, a
♂ is a discharge gas passage. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) An airtight container, a compression element housed in the airtight container that compresses the refrigerant, a crankshaft or bearing having an oil supply passage that supplies lubricating oil to each sliding part of the compression element, and a refrigerant compressed by the compression element. A discharge gas passage through which the refrigerant gas passes at high speed, a communication hole that communicates this discharge gas passage with the oil supply passage of the crankshaft or bearing, and a communication hole through which the refrigerant passes at high speed, the static pressure decreases and this discharge occurs. The lubricating oil stored in the lower part of the sealed container is transferred to the crankshaft or bearing by taking advantage of the fact that the static pressure in the oil supply path of the crankshaft or bearing, which communicates with the gas passage through the communication hole, decreases. A horizontal hermetic compressor equipped with a means of supplying oil to the oil supply path. (2) The horizontal hermetic rotary compressor according to claim 1, wherein the discharge gas passage is provided between the discharge muffler and the outer periphery of the bearing.