Rotary type expansion machine

An expander and rotary technology, applied in the field of expanders, can solve problems such as power consumption, and achieve the effects of reliable power recovery, smooth flow rate changes, and improved power recovery efficiency

Active Publication Date: 2009-12-30
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Under such conditions, power is consumed to discharge the refrigerant from the expander

Method used

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  • Rotary type expansion machine
  • Rotary type expansion machine
  • Rotary type expansion machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0062] Embodiment 1 of the present invention will be described. The air conditioner 10 of the present embodiment includes the rotary expander according to the present invention.

[0063]

[0064] like figure 1 As shown, the above-mentioned air conditioner 10 is a so-called separate type, and has 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 . An indoor fan 14 and an indoor heat exchanger 24 are housed in the indoor unit 13 . The 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 . Note that details of the compression / expansion unit 30 will be described later.

[0065] A refrigerant circuit 20 is provided in the air conditioner 10 d...

Embodiment approach 2

[0132] Embodiment 2 of the present invention will be described. Here, in this embodiment, differences from the first embodiment described above will be described.

[0133] like Figure 11 As shown, in the injection passage 37 of the expansion mechanism unit 60 of the present embodiment, a solenoid valve 91 is provided instead of the electric valve 90 of the first embodiment described above. That is, in the present embodiment, the solenoid valve 91 constitutes the flow control means. When the solenoid valve 91 is opened and closed, the high-pressure refrigerant in the injection passage 37 is intermittently circulated. Furthermore, the controller 100 of the present embodiment has a structure in which the electromagnetic valve 91 is opened and closed based on detection values ​​of the high pressure sensor 101 , the low pressure sensor 102 , and the over-expansion pressure sensor 103 .

[0134] In the present embodiment, the solenoid valve 91 is closed under the operating condi...

Embodiment approach 3

[0136] Embodiment 3 of the present invention will be described. Here, regarding this embodiment, differences from the first embodiment described above will be described.

[0137] like Figure 12 As shown, in the injection passage 37 of the expansion mechanism unit 60 of the present embodiment, a differential pressure valve 92 is provided instead of the electric valve 90 of the first embodiment described above. That is, in the present embodiment, the differential pressure valve 92 constitutes the flow control means. The opening degree of the differential pressure valve 92 changes according to the pressure difference between the refrigerant in the expansion chamber 66 and the refrigerant sent from the second rotating mechanism portion 80 to the outflow port 35 .

[0138] like Figure 13 As shown, the above-mentioned differential pressure valve 92 is composed of the following parts: a valve housing 93, which is connected to the injection passage 37; a valve core 95, which is m...

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PUM

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Abstract

Two rotary mechanism parts (70, 80) are provided in a rotary expander (60). The first rotary mechanism part (70) is smaller in displacement volume than the second rotary mechanism part (80). A first low-pressure chamber (74) of the first rotary mechanism part (70) and a second high-pressure chamber (83) of the second rotary mechanism part (80) are fluidly connected together by a communicating passageway (64), thereby forming a single expansion chamber (66). High-pressure refrigerant introduced into the first rotary mechanism part (70) expands in the expansion chamber (66). An injection passageway (37) is fluidly connected to the communicating passageway (64). When an motor-operated valve (90) is placed in the open state, high-pressure refrigerant is introduced into the expansion chamber (66) also from the injection passageway (37). This makes it possible to inhibit the drop in power recovery efficiency, even in the condition that causes the actual expansion ratio to fall below the design expansion ratio.

Description

technical field [0001] This invention relates to expanders that generate power by the expansion of high pressure fluid. Background technique [0002] Conventionally, volumetric expanders such as rotary expanders are known as expanders that generate power by expanding high-pressure fluid (for example, refer to Patent Document 1). This expander can be applied to an expansion step of a vapor compression refrigeration cycle (for example, refer to Patent Document 2). [0003] The expander has a cylinder and a piston revolving along the inner peripheral surface of the cylinder, and an expansion chamber formed between the cylinder and the piston is divided into a suction / expansion side and a discharge side. Furthermore, with the revolution of the piston, the expansion chamber is switched sequentially as follows: the part that was once the suction / expansion side is switched to the discharge side, the part that was once the discharge side is switched to the suction / expansion side, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01C1/356F01C11/00F01C13/04F01C21/00F25B11/02F01C20/00F01C20/02F01C21/18F04C23/00F25B1/04F25B9/00F25B9/06F25B13/00
CPCF01C1/356F01C1/32F25B9/008F25B2309/061F01C20/26F04C23/003F01C20/02F25B9/06F25B2313/02742F25B13/00F25B1/04F04C23/008F01C13/04F01C21/00F01C11/00
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
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