Air-conditioning unit and air-conditioning unit for railway vehicle

An air-conditioning device and control device technology, applied in the heating/cooling of railway vehicles, railway car body parts, transportation and packaging, etc., can solve problems such as poor lubrication of compressors, and achieve the effect of inhibiting refrigerant stagnation

Active Publication Date: 2014-10-08
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this stagnant state, lubricating oil dissolves into the refrigerant, so there is a possibility of poor lubrication in the compressor

Method used

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  • Air-conditioning unit and air-conditioning unit for railway vehicle
  • Air-conditioning unit and air-conditioning unit for railway vehicle
  • Air-conditioning unit and air-conditioning unit for railway vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] figure 1 This is an example of the refrigerant circuit configuration of the air conditioner 200 according to the first embodiment.

[0038] The air conditioner 200 according to Embodiment 1 separates the refrigerant from the lubricating oil in the compressor.

[0039] [Structure of the air conditioner 200]

[0040] The air conditioner 200 includes an outdoor unit 100 installed outside, for example, and an indoor unit 101 connected to the outdoor unit 100 through a refrigerant pipe to supply air-conditioned air to a space to be air-conditioned (for example, a room, a warehouse, etc.).

[0041] The outdoor unit 100 has: a compressor 1 that compresses and discharges refrigerant; a check valve 2 that is provided on the discharge side of the compressor 1; a four-way valve 3 that switches the flow of refrigerant; an outdoor heat exchanger 4 that function as a condenser (radiator) during cooling operation, and function as an evaporator during heating operation; the blower 8...

Embodiment approach 2

[0127] In Embodiment 2, the same reference numerals are used for the same parts as in Embodiment 1, and the differences between Embodiments 1 and 2 will be mainly described. Figure 7 This is an example of the refrigerant circuit configuration of the air conditioner 200b according to the second embodiment.

[0128] In addition to the configuration of the air conditioner 200 according to Embodiment 1, the air conditioner 200b according to Embodiment 2 is provided with a low-pressure detection means 10 for detecting pressure on a compressor inlet pipe 25 connected to the suction side of the compressor 1 . The low pressure detection means 10 may be constituted by, for example, a pressure sensor or the like. Embodiment 2 is the same as Embodiment 1 about the structure other than this.

[0129] Figure 8 It is an explanatory diagram of the control flow of the air conditioner 200b according to the second embodiment. refer to Figure 8 The operation of the control device 9 will b...

Embodiment approach 3

[0137] In Embodiment 3, the same reference numerals are used for the same parts as Embodiments 1 and 2, and the differences from Embodiments 1 and 2 will be mainly described. Figure 9 It is an example of the refrigerant circuit structure of the air-conditioning apparatus 200c which concerns on Embodiment 3. In addition to the structure of the air conditioner 200b according to the second embodiment, the air conditioner 200c according to the third embodiment is provided with a refrigerant pipe 26 connecting the connection pipe 23B and the compressor 1, and the refrigerant flowing through the refrigerant pipe 26 The expansion member 11 depressurizes the refrigerant, the solenoid valve 12 switches conduction of the refrigerant flowing through the refrigerant pipe 26 , and the temperature detection member 10A detects the temperature of the refrigerant flowing through the compressor outflow side pipe 20 .

[0138] The refrigerant pipe 26 is a pipe that connects the connecting pipe ...

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PUM

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Abstract

The air-conditioning unit according to the present invention comprises a check valve (2) provided between a four-way valve (3) and the discharge side of a compressor (1); a first electromagnetic valve (6) which is provided between an expansion means (5) and a room-internal heat exchanger (7) and can be controlled to open and close; and a control unit (9) for switching the four-way valve (3) and switching opening and closing of the first electromagnetic valve (6). When stopping a heating operation, the control unit (9) switches the four-way valve (3) connection from heating operation to cooling operation, closes the first electromagnetic valve (6) and then stops the compressor (1).

Description

technical field [0001] The present invention relates to an air conditioner and an air conditioner for a railway vehicle, and in particular to suppression of refrigerant stagnation. Background technique [0002] When the compressor of the air conditioner is stopped, a so-called stagnation state may occur in which lubricating oil in the compressor dissolves into the refrigerant in the compressor. In this stagnation state, lubricating oil dissolves into the refrigerant, and thus there is a possibility of poor lubrication in the compressor. [0003] Therefore, as a method of suppressing refrigerant stagnation, an air conditioner has been proposed in which a solenoid valve is provided between a compressor and an outdoor heat exchanger, and an expansion valve capable of temperature control is provided (for example, refer to Patent Document 1). [0004] In addition, as a method of suppressing refrigerant stagnation, an operation control device for an air conditioner that stores re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B13/00F25B1/00
CPCF25B2700/1933F25B49/02F25B41/046F25B2313/02741F25B13/00F25B2313/0292F25B30/02F25B2600/2519F25B2500/27B61D27/0018F25B41/26
Inventor 沟畑隼平新宫和平矢野贤司长田淳
Owner MITSUBISHI ELECTRIC CORP
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