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Rotary type expansion machine

A rotary and expander technology, which is applied in the direction of rotary piston machinery, rotary piston engine, rotary piston pump, etc., can solve the problems of insufficient lubricating oil and leakage of lubricating oil, and achieve the effect of suppressing leakage

Inactive Publication Date: 2008-11-19
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned conventional rotary expander, when the lubricating oil is excessively supplied to the expansion mechanism part, there is a problem that the lubricating oil is excessively supplied from between the end surface of the piston and the front cylinder head or the rear cylinder head. leakage into the expansion chamber inside the cylinder
Therefore, the lubricating oil flows out from the expander together with the refrigerant, so-called oil blow-by occurs, and there is a problem of insufficient lubricating oil.

Method used

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  • Rotary type expansion machine
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  • Rotary type expansion machine

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] Embodiment 1 of the present invention will be described. As shown in FIG. 1, the air conditioner 10 of this embodiment has the rotary expander of this invention.

[0047]

[0048] As shown in FIG. 1 , the air conditioner 10 described above is a so-called separate type and includes an outdoor unit 11 and an indoor unit 13 . An outdoor fan 12 , an outdoor heat exchanger 23 , a first four-way switching valve 21 , a second four-way switching valve 22 , and a compression expansion unit 30 are accommodated in the outdoor unit 11 . On the other hand, an indoor fan 14 and an indoor heat exchanger 24 are housed in the indoor unit 13 . The above-mentioned outdoor unit 11 is installed outdoors, and the indoor unit 13 is installed indoors. In addition, the outdoor unit 11 and the indoor unit 13 are connected by a pair of connecting pipes 15 and 16 . In addition, details of the above-mentioned compression expansion unit 30 will be described later.

[0049] A refrigerant circui...

Embodiment approach 2

[0105] Next, Embodiment 2 of the present invention will be described with reference to the drawings.

[0106] This embodiment 2 is as Figure 6 and Figure 7 As shown, a tip seal is used instead of the lip seal used in the first embodiment described above as the sealing member 92 . That is, in the present embodiment, the sealing mechanism 90 is composed of: a sealing groove 91 formed on the upper and lower end surfaces 67b, 67c of the rotary piston 67; The member 92 is embedded in the sealing groove 91.

[0107] Specifically, the above-mentioned tip seal 92 is a mechanical seal formed of metal materials such as copper. The tip seal 92 has a rectangular cross section and is formed in a discontinuous ring shape in plan view. That is, one part of the entire circumference of the above-mentioned tip seal 92 is cut off in the radial direction (refer to Figure 6 Part D). This cutting is performed for the purpose of installing the tip seal 92 in the seal groove 91 in a state wh...

Embodiment approach 3

[0111] Next, Embodiment 3 of the present invention will be described with reference to the drawings.

[0112] Embodiment 3 such as Figure 8 As shown, the shapes of the seal groove 91 and the tip seal 92 in the second embodiment described above are changed. That is, the seal groove 91 of the present embodiment is formed in a C-shape in which part of the annular seal groove 91 in the second embodiment described above is omitted. The above-mentioned tip seal 92 is similarly formed in a C-shape matching the seal groove 91 in plan view. Furthermore, the seal groove 91 is formed such that a portion C corresponding to the C-shaped opening faces the high-pressure chamber 66 a side of the fluid chamber 65 .

[0113] In the above case, the portion C corresponding to the C-shaped opening between the end faces 67b, 67c of the rotary piston 67 and the front cylinder head 61 and rear cylinder head 62 is not sealed, but due to the high-pressure chamber 66a and the vane tip The inner side...

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Abstract

The upper and lower end surfaces (67b, 67c) of a rotary piston (67) are formed with annular seal grooves (91) extending along the annular end surfaces (67b, 67c), and an annular lip seal (92) is fitted in each of the seal grooves (91). Thereby, the lubricating oil fed from oil feed grooves (49) in the shaft (40) rarely flows from between the upper and lower end surfaces (67b, 67c) of the rotary piston (67) and front and rear heads (61, 62) and into the fluid chamber (65) of a cylinder (63), so that shortage of lubricating oil is eliminated.

Description

technical field [0001] The present invention relates to a rotary expander, and in particular, to a rotary expander provided with countermeasures against oil blow-by. Background technique [0002] Conventionally, as an expander that generates power by expanding high-pressure fluid, for example, Japanese Patent Application Laid-Open No. 2003-172244 discloses a volumetric expander such as a rotary expander. [0003] This rotary expander has an expansion mechanism section having: a cylinder whose both ends are closed by a front cylinder head and a rear cylinder head; and a piston accommodated in the cylinder. A shaft having an eccentric portion penetrates the expansion mechanism portion, and the shaft is rotatably fitted to the piston. Furthermore, in the above-mentioned rotary expander, the lubricating oil pumped up by the oil pump provided on the shaft is supplied to the expansion mechanism section to lubricate the expansion mechanism section. [0004] However, in the above-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01C1/356F01C11/00F01C13/04F01C19/08F01C21/04F04C18/356F04C27/00F16J15/18F16J15/447F04C18/32F04C23/00
CPCF16J15/324F04C27/005F04C18/3564F04C23/001F01C1/3564F01C19/08F01C1/356F01C11/00F04C18/356F16J15/18
Inventor 冈本昌和森胁道雄熊仓英二冈本哲也鉾谷克己
Owner DAIKIN IND LTD