Refrigeration apparatus

a technology of refrigerating apparatus and refrigeration machine, which is applied in the direction of refrigeration machine, corrosion prevention, gas cycle refrigeration machine, etc., can solve the problems of inability to improve the defrosting capacity and the temperature drop on the indoor sid

Inactive Publication Date: 2011-02-10
DAIKIN IND LTD
View PDF2 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]A refrigeration apparatus according to a first aspect of the present invention comprises a compression mechanism, a heat source-side heat exchanger which functions as a radiator or evaporator of refrigerant, a usage-side heat exchanger which functions as an evaporator or radiator of refrigerant, a switching mechanism, and a second-stage injection tube. The compression mechanism has a plurality of compression elements and is configured so that the refrigerant discharged from the first-stage compression element, which is one of a plurality of compression elements, is sequentially compressed by the second-stage compression element. As used herein, the term “compression mechanism” refers to a compressor in which a plurality of compression elements are integrally incorporated, or a configuration that includes a compression mechanism in which a single compression element is incorporated and/or a plurality of compression mechanisms in which a plurality of compression elements have been incorporated are connected together. The phrase “the refrigerant discharged from a first-stage compression element, which is one of the plurality of compression elements, is sequentially compressed by a second-stage compression element” does not mean merely that two compression elements connected in series are included, namely, the “first-stage compression element” and the “second-stage compression el

Problems solved by technology

In cases in which a reverse cycle defrosting operation is used as the defrosting operation, wherein the outdoor heat exchanger is made to function as a radiator of refrigerant by switching the switching mechanism from an air-warming operation state to an air-cooling operation state, the indoor heat exchanger is made to function as an evaporator of refrigerant regardless of the intention being to cause the indoor heat exchanger to function as a radiator of refrigerant, and a problem is encountered in that the temperature decreases on the indoor side.
However, when the second-stage injection tu

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Refrigeration apparatus
  • Refrigeration apparatus
  • Refrigeration apparatus

Examples

Experimental program
Comparison scheme
Effect test

modification 1

(3) Modification 1

[0094]In the embodiment described above, in the air-conditioning apparatus 1 configured to be capable of switching between the air-cooling operation and the air-warming operation via the switching mechanism 3, the first second-stage injection tube 18c is provided for performing intermediate pressure injection through the receiver 18 as a gas-liquid separator, and intermediate pressure injection is performed by the receiver 18 as a gas-liquid separator, but instead of intermediate pressure injection by the receiver 18, another possible option is to provide a second second-stage injection tube 19 and an economizer heat exchanger 20 and to perform intermediate pressure injection through the economizer heat exchanger 20.

[0095]For example, as shown in FIG. 10, a refrigerant circuit 110 can be used which is provided with a second second-stage injection tube 19 and an economizer heat exchanger 20 instead of the first second-stage injection tube 18c in the embodiment descr...

modification 2

(4) Modification 2

[0118]In the refrigerant circuits 10 and 110 (FIGS. 1 and 10) in the embodiment and Modification 1 described above, intermediate pressure injection by the receiver 18 as a gas-liquid separator or intermediate pressure injection by the economizer heat exchanger 20 is performed, whereby the temperature of the refrigerant discharged from the second-stage compression element 2d is reduced, the power consumption of the compression mechanism 2 is reduced, and operating efficiency is improved, but in addition to this configuration, the intermediate refrigerant tube 8 for drawing the refrigerant discharged from the first-stage compression element 2c into the second-stage compression element 2d may also be provided with an intermediate heat exchanger 7 that functions as a cooler of refrigerant discharged from the first-stage compression element 2c and drawn into the second-stage compression element 2d.

[0119]For example, the refrigerant circuit 110 of Modification 1 describ...

modification 3

(5) Modification 3

[0144]In the refrigerant circuits 110 and 210 (see FIGS. 10 and 18) in Modifications 1 and 2 described above, in both the air-cooling operation in which the switching mechanism 3 is brought to the cooling operation state and the air-warming operation in which the switching mechanism 3 is brought to the heating operation state, the temperature of the refrigerant discharged from the second-stage compression element 2d is reduced, the power consumption of the compression mechanism 2 is reduced, and operating efficiency can be improved by performing intermediate pressure injection by the economizer heat exchanger 20 as described above. The intermediate pressure injection by the economizer heat exchanger 20 is believed to be beneficial in a refrigerant circuit configuration having a single usage-side heat exchanger 6, wherein the pressure difference from the high pressure in the refrigeration cycle to the nearly intermediate pressure of the refrigeration cycle can be us...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A refrigeration apparatus uses supercritical range refrigerant, and includes a multi-stage compression mechanism, a heat source-side heat exchanger, a usage-side heat exchanger, a switching mechanism switchable between cooling and heating operation states, and a second-stage injection tube. The second-stage injection tube branches off refrigerant, which has radiated heat in the heat source-side heat exchanger or the usage-side heat exchanger, and returns the refrigerant to the second-stage compression element. Refrigerant is prevented from returning to the second-stage compression element through the second-stage injection tube at least during a beginning of a reverse cycle defrosting operation, which is performed to defrost the heat source-side heat exchanger by switching the switching mechanism to the cooling operation state.

Description

TECHNICAL FIELD[0001]The present invention relates to a refrigeration apparatus, and particularly relates to a refrigeration apparatus which has a refrigerant circuit configured to be capable of switching between a cooling operation and a heating operation and which performs a multistage compression refrigeration cycle by using a refrigerant that operates in a supercritical range.BACKGROUND ART[0002]As one conventional example of a refrigeration apparatus which has a refrigerant circuit configured to be capable of switching between a cooling operation and a heating operation and which performs a multistage compression refrigeration cycle by using a refrigerant that operates in a supercritical range, Patent Document 1 discloses an air-conditioning apparatus which has a refrigerant circuit configured to be capable of switching between an air-cooling operation and an air-warming operation and which performs a two-stage compression refrigeration cycle by using carbon dioxide as a refrig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F25B13/00
CPCF25B1/10F25B9/008F25B13/00F25B47/025F25B2400/23F25B2313/0272F25B2313/02741F25B2400/13F25B2309/061
Inventor YOSHIMI, ATSUSHIFUJIMOTO, SHUJI
Owner DAIKIN IND LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap