Air conditioner

• US 10,215,452 B2
• Filed: 06/09/2015
• Issued: 02/26/2019
• Est. Priority Date: 07/18/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Ogawa, Mizuki, Takamatsu, Ryohei, Saito, Koji, Imaizumi, Masaru, Motomura, Yuji
• Primary Examiner(s): Norman, Marc E
• Application Number:
  US15/314,022
• Publication Number:
  US 20170191706A1
• Time in Patent Office: 1,358 Days
• CPC Class Codes: F16K 11/076 with sealing faces shaped as surfaces of solids of revolution
• CPC Class Codes: F24F 5/00 Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00 , e.g. using solar heat or combined with household units such as an oven or water heater
• CPC Class Codes: F25B 1/00 Compression machines, plants or systems with non-reversible cycle F25B3/00, F25B5/00, F25B6/00, F25B7/00, F25B9/00 take precedence
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2313/003 Indoor unit with water as a heat sink or heat source
• CPC Class Codes: F25B 2313/006 two pipes connecting the outdoor side to the indoor side with multiple indoor units
• CPC Class Codes: F25B 2313/0231 with simultaneous cooling and heating
• CPC Class Codes: F25B 2313/0233 in parallel arrangements
• CPC Class Codes: F25B 2313/0272 using bridge circuits of one-way valves
• CPC Class Codes: F25B 2313/02743 using three four-way valves
• CPC Class Codes: F25B 2313/0314 Temperature sensors near the indoor heat exchanger
• CPC Class Codes: F25B 29/00 Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
• CPC Class Codes: F25B 29/003 of the compression type system
• CPC Class Codes: F25B 41/20 Disposition of valves, e.g. of on-off valves or flow control valves expansion valves F25B41/31
• CPC Class Codes: F25B 47/003 for preventing corrosion
• CPC Class Codes: F25B 49/02 for compression type machines, plants or systems

Abstract

A heat-medium flow-path switching device and a heat-medium flow-rate adjusting device are integrated into an integrated heat-medium flow-rate adjusting device. The integrated heat-medium flow-rate adjusting device is configured to perform the heat-medium flow-path switching function and the meat-medium flow-rate adjusting function by driving and controlling a single drive unit. Moreover, the integrated heat-medium flow-path switching device is configured to perform a function of closing flow paths from/to a use-side heat exchanger added to the heat-medium flow-rate adjusting function.

Claims

1. An air conditioning system comprising:

a refrigerant circulating path network connecting, with refrigerant lines, a compressor;

a heat-source side heat exchanger for evaporating and gasifying or condensing and liquefying a heat-source side refrigerant;

expansion valves for controlling a flow rate of the refrigerant;

refrigerant pipes in intermediate heat exchangers for exchanging heat between the heat-source side refrigerant and a use-side heat medium; and

a four-way valve, a plurality of two-way valves or a plurality of three-way valves for switching a circulation path of the refrigerant, for circulating the heat-source side refrigerant; and

a heat medium circulating path network connecting, with heat-medium lines, pumps for pressurizing and sending the heat medium;

use-side heat exchangers for exchanging heat between the heat medium with air in interior spaces to be air conditioned; and

heat-medium pipes in the intermediate heat exchangers, for circulating the heat medium,

wherein

temperatures in the interior spaces to be air conditioned are controlled by exchanging heat, through the use-side heat exchangers, between the air in the interior spaces to be air-conditioned and the heat medium heated or cooled by the heat-source side refrigerant in the intermediate heat exchangers,

the air conditioning system further comprising;

integrated heat-medium flow-path switching devices connectedly interposed between the intermediate heat exchangers and the use-side heat exchangers, each integrated heat-medium flow-path switching device including thereinside;

a heat-medium flow-path switching valve having holes formed in its sidewall and having a longitudinal inner partition, a first end and a second end opposite the first end, the longitudinal inner partition extending from the first end to the second end,

wherein the heat-medium flow-path switching valve is revolved to select either of the heated heat medium or the cooled heat medium for it to flow between the intermediate heat exchangers and the use-side heat exchangers, whereby air conditioning is performed.

2. The air conditioning system of claim 1, wherein in a case of providing the plurality of use-side heat exchangers, the same or less number of integrated heat-medium flow-path switching devices as or than the number of use-side heat exchangers are provided to perform a heating only operation mode in which all intermediate heat exchangers act as condensers, a cooling only operation mode in which all intermediate heat exchangers act as evaporators, and a cooling and heating mixed operation mode in which part of the intermediate heat exchangers act as a condenser and the other part of the intermediate heat exchangers act as an evaporator.

3. The air conditioning system of claim 2, wherein flow rates of the heat medium flowing between the intermediate heat exchangers and the use-side heat exchangers are controlled during each operation mode.

4. The air conditioning system of claim 3, wherein switching between the heated heat medium and cooled the heat medium as well as adjusting the flow rates of the heat medium are performed by single drive units provided in the integrated heat-medium flow-path switching devices so as to keep at target values the differences between temperatures measured with temperature sensors provided to the intermediate heat exchangers and temperatures of the heat medium at the use-side heat exchangers.

5. The air conditioning system of claim 3, wherein in each operation mode, heat-medium flow paths between the intermediate heat exchangers and the use-side heat exchangers are closed by controlling part of or all of the drive units in the plurality of integrated heat-medium flow-path switching devices to close the flow paths.

6. The air conditioning system of claim 1, wherein the refrigerant with which the refrigerant circulating path network is charged is a single refrigerant, a near-azeotropic refrigerant mixture, a non-azeotropic refrigerant mixture, or a natural refrigerant that is changeable to a two-phase state or a supercritical state.

7. The air conditioning system of claim 1, wherein the heat medium with which the heat-medium circulating path network is filled is an antifreeze liquid or a mixture of water and an additive having a high anti-corrosion effect.

8. The air conditioning system of claim 1, wherein the flow paths of the heat medium are formed by configuring integrated heat-medium flow-path switching devices such that part of flow paths of at least one of the heated heat medium and the cooled heat medium are connectedly formed in the integrated heat-medium flow-path switching devices.

9. The air conditioning system of claim 1, wherein the flow paths of the heat medium are formed by joining pipes that are connected to the integrated heat-medium flow-path switching device(s) and through which at least one of the heated heat medium and the cooled heat medium is passed, to allow the number of integrated heat-medium flow-path switching devices to be changeable.