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Volume expander and fluid machine

A volumetric, expander technology, applied in mechanical equipment, machines/engines, rotary piston machines, etc., to achieve a simple structure, improve power recovery efficiency, and prevent the action from becoming unstable.

Inactive Publication Date: 2007-11-14
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Under such conditions, power is consumed internally in the expander to discharge the refrigerant

Method used

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  • Volume expander and fluid machine
  • Volume expander and fluid machine
  • Volume expander and fluid machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0062] Embodiments of the present invention will be described in detail below with reference to the drawings. In Embodiment 1, an air conditioner 10 is configured using the fluid machine of the present invention.

[0063] (The overall structure of the air conditioner)

[0064] As shown in FIG. 1 , the air conditioner 10 described above is a so-called separate type air conditioner and includes an outdoor unit 11 and an indoor unit 13 . The outdoor unit 11 accommodates 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 . An indoor fan 14 and an indoor heat exchanger 24 are housed in the indoor unit 13 . Furthermore, 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 communication pipes 15 and 16 . Note that the details of the compression / expansio...

Embodiment approach 2

[0122] Embodiment 2 of the present invention, as shown in FIG. 15 , is an example in which a solenoid valve 77 is provided instead of a check valve 73 in the communication pipe 72 of the expansion part 60 in the fluid machine of the first embodiment. In Embodiment 2, one end of the communication pipe 72 is connected to the outflow port 37 side, and the other end is directly connected to the cylinder 61 to communicate with the expansion chamber 62 .

[0123] The solenoid valve 77 is configured to open when the expansion chamber 62 is over-expanded, similarly to the check valve 73 in the first embodiment. Therefore, in the air conditioner 10 according to Embodiment 2, in addition to the high-pressure pressure sensor 78a generally provided on the refrigerant circuit 20, an over-expansion pressure sensor 78b for detecting the pressure of the expansion chamber is provided. And, when the control unit 79 of the air conditioner 10 determines that over-expansion has occurred based on t...

Embodiment approach 3

[0127] Embodiment 3 of the present invention is an example in which the structure of the communication passage in the middle of the expansion process communicating the outflow port 37 and the expansion chamber 62 is changed compared with the first and second embodiments.

[0128] In Embodiments 1 and 2, an example in which a communication pipe 72 is provided as a communication passage has been described, but in Embodiment 3, as shown in FIGS. 16(a) and 16(b), a communication passage 80 is formed in Inside the cylinder 61 which is a component of the expansion mechanism unit 60 . As the communication channel 80 , a first recessed portion 81 is formed on the surface of the cylinder 61 on the side of the occipital head 64 , and a second recessed portion 82 is formed on the surface of the cylinder 61 on the side of the front head 63 . In addition, the cylinder 61 is formed with: a communicating hole 83 communicating with the first recessed portion 81 and the second recessed portion...

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Abstract

A volume expander is provided with a penetration passage (72) penetrating in an expansion chamber (62) between an intermediate position and outflow position of an expansion process. This makes it possible that a fluid on the outflow side is returned to the expansion chamber (62). As a result, the pressure in the expansion chamber (62) is prevented from excessively decreasing in a predetermined operating condition, and the lowering in power recovery efficiency is suppressed.

Description

technical field [0001] The present invention relates to a volumetric expander having an expansion mechanism that generates power by expanding a high-pressure fluid, and a fluid machine including the expander. Background technique [0002] Conventionally, volumetric expanders such as rotary expanders have been known as expanders that generate power by expansion of high-pressure fluid (for example, refer to JP-A-8-338356). The expander can be used, for example, to carry out the expansion step of a vapor-compression refrigeration cycle. [0003] The expander includes 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. And, with the revolving action of the piston, the expansion chamber is sequentially switched as follows: the part that was once the suction / expansion side is switched to the discharge side, the part t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01C20/16F01C1/32F01C11/00F01C20/00F01C1/356F01C1/44F01C13/04F01C21/18F04C18/02F04C18/32F04C23/02F04C29/12F25B11/02
CPCF01C20/16F01C11/008F01C1/322
Inventor 鉾谷克己森胁道雄冈本昌和熊仓英二冈本哲也
Owner DAIKIN IND LTD
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