JP6905613B1 - Reciprocating compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an oil level of a lubricating oil from dropping from a fuel filler port due to low frequency vibration caused by an earthquake or the like. SOLUTION: The reciprocating motion has a cylinder and a piston in the upper part, a lubricating oil storage unit 10 for storing lubricating oil by opening the oil level in the lower part, and a suction port 11 for taking in lubricating oil Oi in the oil storage unit 10. The compressor includes a vertical first partition member 21 that divides the oil storage unit 10 in the horizontal direction, and a horizontal second partition member 22 that divides the oil storage unit 10 in the height direction above the oil storage unit 10. .. [Selection diagram] Fig. 2

Description

The present invention relates to a reciprocating compressor, and more particularly to a reciprocating compressor capable of suppressing fluctuations in the oil level.

The basic structure of a reciprocating compressor used in a refrigerator or the like has a crankshaft as a center, a cylinder and a piston at the upper part, and a lubricating oil tank (oil storage part) at the lower part.
In the type in which the lubricating oil is forcibly supplied by the lubricating oil pump, a suction port for taking in the lubricating oil is arranged below the lubricating oil tank.

One of the prior arts is the following prior art.

However, in a reciprocating compressor, when it receives vibrations (especially low frequency vibrations) due to an earthquake or the like, the oil level of the lubricating oil fluctuates, and the open oil level drops below the suction port, resulting in the lubricating oil. It was assumed that the intake could not be performed, the suction function was hindered, and the reciprocating compressor could not be operated.

Republished WO2014 / 054992

Therefore, a main object of the present invention is to provide a reciprocating compressor capable of preventing the oil level of the lubricating oil from dropping from the fuel filler port due to vibration caused by an earthquake or the like.

The present invention for solving this problem is in a reciprocating compressor having a cylinder and a piston at the upper part, a lubricating oil storage part at the lower part, and a suction port for taking in the lubricating oil in the oil storage part. It is characterized in that it is provided with a vertically oriented first partition member that divides the portion in the horizontal direction.

By providing the first partition member, the fluctuation of the oil level of the lubricating oil due to vibration is suppressed, so that the oil level drops below the suction port, and as a result, the lubricating oil cannot be taken in. It can be avoided.

In this case, the one provided with both a vertically oriented first partition member for horizontally dividing the oil storage portion and a horizontally oriented second partition member for dividing the oil storage portion in the height direction is more suitable. Suitable.

When the oil level is strongly subjected to vertical vibration due to an earthquake, the violent bubbling of the oil level can be suppressed by the second partition member, and the oil level drops below the suction port, resulting in the uptake of lubricating oil. You can avoid situations that cannot be done.

According to the present invention, it is possible to prevent the oil level of the lubricating oil from dropping below the fuel filler port due to vibration caused by an earthquake or the like.

It is a partially broken front view of a reciprocating compressor. It is a partially broken front view of the reciprocating compressor which concerns on this invention. It is a perspective view of the example of a swing suppressing material. It is a top view of the 2nd partition member example. It is an arrow view of the first partition member example. It is an arrow view of the first partition member example. It is a top view of another example of the 2nd partition member. It is a top view of the example which fixed the rocking inhibitor in the oil storage part of the reciprocating compressor. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment. It is a photograph which shows the oil level fluctuation in a vibration experiment.

Hereinafter, embodiments of the present invention will be described.

As shown in FIG. 1, the basic structure of a reciprocating compressor has a cylinder and a piston in the upper part of the housing 1, and a lubricating oil storage unit 10 in the lower part for storing lubricating oil by opening the oil level.
A cylinder 4 (only a portion is shown) is driven by a cylinder and a piston, and a medium, for example, a refrigerant is sucked from a suction unit 2, compressed, and then discharged from a discharge unit 3.

The oil storage unit 10 has a suction port 11 having a lubricating oil strainer on the outer surface, and the lubricating oil is sucked by the oil pump 12 through the flow path formed in the housing 1 and formed in the structure of the crankshaft. Oil is supplied to the connecting rod rotating part through the flow path.
Further, the lubricating oil that has been lubricated and is supplied to the piston pin and the piston sliding portion through the flow path is released into the housing 1 through the gaps between the respective portions and flows down into the oil storage portion 10 by gravity.

However, when the oil level falls below the suction port 11 due to vibration such as an earthquake, the above-mentioned flow of the lubricating oil is obstructed, so that the reciprocating compressor cannot be operated.

Therefore, according to the present invention, for example, the swing suppressing means 20 in the form shown in FIG. 2 is provided.
The rocking suppressing means 20 is divided into a vertical first partition member 21 that horizontally divides the oil storage portion 10 and a height direction above the oil storage portion 10 as shown in FIGS. 3 to 6. It can be composed of a horizontal second partition member 22 to be formed.

The first partition member 21 of the illustrated example is arranged in a grid pattern in a plan view. For example, the open groove 21b formed in the built-in plate 21B can be inserted into the upper open groove 21a formed in the receiving plate 21A and assembled in a grid pattern.

A transmission hole 21c through which the lubricating oil Oi permeates can be formed in the first partition member 21. The through hole 21c is such that the lubricating oil Oi moves to the suction port 11 so that the lubricating oil Oi can be smoothly sucked from the suction port 11.

The second partition member 22 arranged horizontally is provided above the suction port 11 and below the oil level of the lubricating oil Oi.

Further, the second partition member 22 can also be formed with a transmission hole 22c through which the lubricating oil Oi permeates. The through hole 22c is such that the lubricating oil Oi moves to the suction port 11 so that the lubricating oil Oi can be smoothly sucked from the suction port 11.

The swing suppressing means 20 in which the first partition member 21 and the second partition member 22 are connected and fixed is installed in the lubricating oil Oi oil storage unit 10. In this case, since it is not preferable to move the lubricating oil Oi by swinging the oil level, it is desirable to directly or indirectly fix the lubricating oil Oi to the housing 1 by an appropriate means for restricting the movement.

As an example of this fixing, the lengths of the receiving plate 21A and the built-in plate 21B of the first partition member 21 are made to substantially match the inner dimensions between the facing wall surfaces of the oil storage unit 10, and the length of the second partition member 22 is set. And the width can be fixed by making them substantially match the inner dimensions between the facing wall surfaces of the oil storage unit 10.
Further, it is more desirable that the recess 22d formed in the peripheral portion of the second partition member 22 is formed so as to substantially match the bulging portion 1d into the oil storage portion 10 in the housing 1.

The rocking suppressing means is not limited to the above-mentioned example. For example, as shown in FIG. 7, the number of the first partition member 21 and the number of the second partition member 22 can be changed, and the assembling form thereof is not limited (for example, welding or connection by a connecting material). Such).

Further, the shape of the transmission hole 21c and the transmission hole 22c can be selected from an appropriate shape such as an ellipse and a slit 22c1 shown in FIG. 7, in addition to a circular shape. The number of through holes 21c and through holes 22c and the area ratio occupied by them (for example, in the range of 5 to 60%) can be appropriately selected.

On the other hand, if necessary, a passage hole 21e can be formed at the bottom of the first partition member 21.

Further, if necessary, a plurality of second partition members 22 may be arranged at intervals in the height direction.

Next, a test example will be shown to clarify the effect of the present invention.
A test container in which lubricating oil was stored in a transparent acrylic container that imitated the oil storage part of a reciprocating compressor for a refrigerator was used.
On the shaking table of the vibration tester, the test container and the video camera were installed at positions separated by a predetermined distance.
In this state, the shaking table of the vibration tester was vibrated in the horizontal direction and the vertical direction. At that time, the behavior of the lubricating oil level was imaged by a video camera while changing the excitation frequency and the excitation acceleration.

Representative results are shown in FIGS. 9 to 20. In FIGS. 9 to 20, the dotted line indicates the position of the upper surface of the suction port 11. The solid line is a rough trace of the lubricating oil level.

Table 1 shows the results of evaluating the relationship between the lubricating oil level and the position of the upper surface of the suction port 11.

Looking closely at FIGS. 9 to 20 and Table 1, the following can be seen.
(1) When the partition member is not used, as shown in FIG. 9, when a low frequency horizontal vibration is received, the lubricating oil level becomes lower than the suction port 11 and there is a great possibility that a problem may occur. Further, even when a strong vertical acceleration is received at a high frequency, as shown in FIG. 18, there is a great possibility that the lubricating oil level becomes lower than the suction port 11 and a problem occurs.
(2) On the other hand, if the first partition member 21 is provided, the lubricating oil level does not fall below the suction port 11 even if it receives horizontal vibrations of low frequency and high frequency.
(3) When only the first partition member 21 is provided and the second partition member 22 is not provided, as shown in FIG. 18, when a strong vertical acceleration is received at a high frequency, the lubricating oil level becomes a suction port. There is a great possibility that it will be lower than 11 and cause problems.
(4) When the first partition member 21 and the second partition member 22 are provided, there is no possibility that the lubricating oil level becomes lower than the suction port 11 under all conditions.

From the above consideration, the installation of the first partition member is particularly effective when it receives horizontal vibration.
When both the first partition member and the second partition member are provided, there is no possibility that the lubricating oil level will be lower than the suction port under all conditions.
Therefore, the installation of the first partition member is effective, and it is more desirable to install the second partition member in consideration of the condition of receiving a severe vertical acceleration at a high frequency.

The present invention can be applied not only to a refrigerator using a refrigerant, but also to a reciprocating compressor that is connected to a motor to compress various media.

Claims (3)

In a reciprocating compressor having a cylinder and a piston in the upper part, a lubricating oil storage part in the lower part for storing lubricating oil by opening the oil level, and a suction port for taking in the lubricating oil in the oil storage part.
A vertical first partition member that horizontally divides the oil storage unit, and
Above the oil storage section, a second horizontal partition member that divides in the height direction and
Equipped with a,
The length of the first partition member is substantially the same as the inner dimension between the facing wall surfaces of the oil storage portion.
A through hole through which lubricating oil permeates is formed in the first partition member.
A through hole through which lubricating oil permeates is formed in the second partition member.
The length and width of the second partition member with respect to the entire oil storage portion in a plan view are substantially matched with the inner dimensions between the facing wall surfaces of the oil storage portion.
A reciprocating compressor characterized in that the second partition member is provided above the suction port and in the oil storage unit. The reciprocating compressor according to claim 1, wherein the first partition member is arranged in a grid pattern in a plan view. The reciprocating compressor according to claim 1, wherein the first partition member and the second partition member are connected and fixed, and are fixed to a housing constituting the lubricating oil storage unit.

Images