JPH0799150B2 - Fluid compressor - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to a horizontal type fluid compressor used in a refrigeration cycle such as an air conditioner.

(Prior Art) A horizontal scroll compressor used in a refrigeration cycle of an air conditioner or the like is shown in FIG. 3, for example. A motor drive mechanism section 2 and a scroll compression mechanism section 3 are incorporated inside a cylindrical closed container 1 whose both ends are closed. The motor drive mechanism section 2 comprises a stator 4 fixed to the inner wall surface side of the closed casing 1 and a rotor 5 rotatably supported inside the stator 4. The rotor 5 has a rotary shaft 6 attached thereto. It is connected through. One end of the rotary shaft 6 is rotatably supported by a fixed frame 7 that constitutes a part of the scroll compression mechanism section 3. The other end of the rotary shaft 6 projects from the rotor 5, and a positive displacement pump 8 is connected to the tip of the rotor 5. An oil introducing pipe 9 is connected to the end of the positive displacement pump 8. The end of the oil introduction pipe 9 on the suction side is extended downward so as to be submerged in the lubricating oil b contained in the closed container 1.

Further, an oil supply passage for supplying the lubricating oil b by the positive displacement pump 8 is axially formed in the rotary shaft 6 so as to be supplied to each sliding portion such as the fixed frame 7. .

Further, one end of the rotary shaft 6 supported so as to penetrate the fixed frame 7 is formed as a crank portion 10, and a movable scroll member 11 is connected to the crank portion 10. The movable scroll member 11 is formed in a disk shape, and a boss hole portion 12 to which the crank portion 10 is connected is formed in the center portion of one side surface. The other side surface of the movable scroll member 11 has a spiral first scroll blade.
13 are integrally formed.

The fixed frame 7 has a fixed scroll member 14
Are combined. A second scroll blade 15 is formed in the fixed scroll member 14 at a portion facing the movable scroll member 11, and a plurality of working chambers 16 are formed between the fixed scroll member 14 and the first scroll blade 13. The working chamber 16 sucks the refrigerant gas at the outer peripheral portion thereof, and gradually moves to the center to reduce the volume and compress the refrigerant gas.

A discharge port 17 is formed in the center of the fixed scroll member 14, and a silencer 18 is provided on the fixed scroll member 14 so as to surround the discharge port 17.

The scroll compressor configured as described above is capable of supplying lubricating oil in a horizontal state, but if the oil level changes due to tilting or vibration of the main body,
There is a risk that the tip of the oil introduction pipe 9 is exposed from the oil surface, resulting in insufficient oil supply.

(Problem to be Solved by the Invention) A horizontal type fluid compressor is provided with its rotating shaft oriented in the lateral direction, and is connected to a pump for oil supply provided at the end of this rotating shaft. The oil introduction pipe is bent downward, and the suction port is immersed in the lubricating oil contained in the closed container. However, in such a fluid compressor, when the main body is tilted or vibrated, the oil level fluctuates, and oil suction failure occurs from the oil introduction pipe, which may cause insufficient oil supply.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluid compressor that can maintain a stable oil supply by keeping the oil introducing pipe submerged in oil even when the oil surface greatly changes due to tilting or vibration of the main body. And

[Means for Solving the Problems] (Means for Solving the Problems) A motor drive mechanism unit having a rotation axis oriented in the lateral direction is provided inside the closed container, a compression mechanism unit is provided inside the closed container, and inside the closed container. The lubricating oil is stored to a predetermined level, a positive displacement pump is provided at the end of the rotary shaft, an oil introduction pipe is provided in the positive displacement pump, and the oil introduction pipe extends downward from a portion connected to the positive displacement pump. It is bent and extends along the inner wall surface of the lower side of the closed container, a suction port is provided at the end of the oil introduction pipe, and this suction port divides the entire length of the closed container in the lateral direction into about 3 equal parts. The fluid compressor located within the range of the central part when it did.

(Operation) Bend the suction port of the oil introduction pipe of the positive displacement pump downward and extend it along the inner wall surface of the lower side of the closed container so that the suction port is located at approximately the center of the entire length of the closed container. By locating it, the suction port can be provided at a position where the fluctuation of the oil level when the closed container is tilted or vibrates is the smallest, and a poor refueling can be prevented with a high probability.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The fluid compressor shown in the drawing is a scroll compressor 20, and includes a closed container 21 formed in a tubular shape with both ends closed. A motor drive mechanism section 22 and a scroll compression mechanism section 23 driven by the motor drive mechanism section 22 are housed in the closed container 21.

The motor drive mechanism unit 22 has a stator 24 fixed inside the hermetic container 21, and a rotor 25 located in the central portion of the stator 24, and the hermetic container 21 in the central portion of the rotor 25. A rotary shaft 26 directed in the axial direction of the is connected in a penetrating state, and one end side thereof is pierced through a central portion of a fixed frame 27 forming a part of the scroll compression mechanism portion 23 and rotatably supported. ing. Here, the fixed frame 27 is coupled and fixed to the inner wall surface of the closed container 21. The rotating shaft 26 is rotatably supported by a bearing portion 28 of the fixed frame 27 at a midway portion on one end side, and the rotor 25 has an inner wall surface of the hermetic container 21 via the rotating shaft 26 and the fixed frame 27. Supported by the side. In addition, a crank portion is provided at the end of the rotary shaft 26 that penetrates the fixed frame 27.
29 are formed. A balancer 30 is provided on the center side of the crank portion 29, and a movable scroll member 31 is connected to the crank portion 29. The movable scroll member 31 is provided with a boss portion connected to the crank portion 29 at the center of one side surface of a disk-shaped end plate, and a spiral scroll blade formed on the other side surface of the end plate. Also,
A fixed scroll member 32 is coupled to the fixed frame 27. The fixed scroll member 32 is formed with spiral scroll blades that are positioned in an alternating manner on the scroll blades of the movable scroll member 31 and form a plurality of working chambers 33.

A suction pipe (not shown) that penetrates the closed container 21 is connected to the side wall surface of the fixed scroll member 32. A discharge port 34 for discharging the compressed gas into the closed container 21 is formed in the central portion of the fixed scroll member 32, and a muffler 35 having a vessel shape is joined to the outside of the discharge port 34. ing.

Here, the closed container 21 has a predetermined level of lubricating oil b.
Are accommodated, and the lubricating oil b is supplied to each sliding portion by a pump structure described later.

On the other hand, a positive displacement pump 36 is connected to the other end of the rotary shaft 26 discharged from the rotor 25. The positive displacement pump 36 is, for example, a trochoid pump for pumping the lubricating oil b to an oil supply passage 37 formed in the axial direction of the rotary shaft 26. The oil supply passage 37 supplies the lubricating oil b to the rotary shaft 26. It is formed so as to supply each of the 26 sliding parts.

Further, an oil introduction pipe 38 as described below is connected to the tip of the volume pump 36. This oil introduction pipe 38
Has a first bent portion 39 bent downward near the portion connected to the positive displacement pump 36. This first bent part
Reference numeral 39 is bent while being inclined in a direction along the curvature of the end wall surface of the closed container 21. The lower side of the first bent portion 39 is linearly extended in an inclined state, and further, the second bent portion is bent toward the central portion of the closed container 21 in the vicinity of the bottom surface of the closed container 21. 40 is located. The oil introducing pipe 38 bent at the second bent portion 40 is extended so as to enter between the inner wall surface of the closed container 21 and the stator 24, and the suction port 41 is formed in the closed container 21.
Is located in the central dimension range a when the dimension in the longitudinal direction is divided into 1/3. Here, the suction port 41 includes an oil filter 41a.

The bent structure of the oil introduction pipe 38 is not limited to the above, and may be a structure curved along the curvature of the end surface of the closed container 21.

In the scroll compressor 20 configured as described above, the oil level may change due to inclination or vibration, and the oil level state in that case is shown in FIG. As shown in the figure, even if the oil level greatly changes, the suction port 41 of the oil introduction pipe 38 is at the position where the oil level in the center of the bottom of the closed container 21 does not fluctuate most, so that suction failure does not occur. A stable refueling can be realized. As shown in the figure, the suction port 41 is sufficiently submerged from the oil surface even when it is inclined ± 20 °.

As described above, the oil introduction pipe 38 is extended along the lower inner wall surface of the airtight container 21, and the suction port 41 is located at substantially the central portion of the airtight container 21, so that the oil supply is poor even if the oil level changes. The scroll compressor 20 that does not cause

The present invention is not limited to the above embodiment. For example, in the above embodiment, the fluid compressor was a scroll compressor, but the present invention is not limited to this, and any fluid compressor having a positive displacement pump 36 at the end of the rotary shaft may be used, such as a reciprocating type or a rotary type. The same effect can be obtained with a compressor.

[Advantages of the Invention] A positive displacement pump is provided at the end of a rotary shaft provided in the horizontal direction in a closed container of a horizontal fluid compressor, and an oil introduction pipe is connected to the positive displacement pump. The oil introducing pipe is bent downward along the inner wall surface of the closed container, and further bent laterally along the lower inner wall surface of the closed container, and is extended to the center side of the closed container to form a suction port. This suction port is located within the central range when the total length of the closed container in the lateral direction is divided into three equal parts. With such a configuration, even if the oil level changes when the fluid compressor is tilted or vibrated, the suction port can be kept submerged from the oil level to enable stable oil supply. Since it is provided in the vicinity of the inner wall on the lower side of the central side of the closed container, the suction pipe can be located at the position where the fluctuation of the oil level is the minimum, and the occurrence rate of poor lubrication compared to the conventional structure. Can be kept extremely low.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of a horizontal scroll compressor, and FIG. 2 is a horizontal scroll compressor showing a state in which the oil level fluctuates. FIG. 3 is a sectional view showing a conventional horizontal scroll scroll compressor. 20 …… Scroll compressor (fluid compressor), 21 ……
Airtight container, 22 …… Motor drive mechanism, 23 …… Scroll compression mechanism (compression mechanism), 36 …… Displacement type pump, 38…
… Oil inlet pipe, 41… Suction port, b… Lubricating oil.

Claims (1)

[Claims] 1. A hermetically sealed container, a motor drive mechanism portion provided inside the hermetically sealed container with a rotation axis oriented in a lateral direction, and provided inside the hermetically sealed container and driven by the motor drive mechanism portion. A compression mechanism part, a lubricating oil contained in the closed container up to a predetermined level, a positive displacement pump provided at the end of the rotary shaft, and an oil introduction pipe connected to the positive displacement pump. In the fluid compressor described above, the oil introducing pipe is bent downward from a portion connected to the positive displacement pump, and extends along the inner wall surface of the lower side of the closed container, and the end of the oil introducing pipe is A fluid compressor characterized in that the suction port formed in the section is located within the range of the central portion when the total length in the lateral direction of the closed container is divided into about three equal parts.