CN105308400A

CN105308400A - Air conditioner

Info

Publication number: CN105308400A
Application number: CN201480033387.9A
Authority: CN
Inventors: 斋藤匡史
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2013-06-11
Filing date: 2014-06-02
Publication date: 2016-02-03
Anticipated expiration: 2034-06-02
Also published as: AU2014279254B9; EP3009773A1; EP3009773B1; AU2014279254B2; AU2014279254C1; EP3009773A4; WO2014199855A1; AU2014279254A1; ES2673875T3; JP2015017795A; CN105308400B; JP5862704B2

Abstract

Provided is an air conditioner having a refrigerant circuit configured by connecting a compressor, an outdoor heat exchanger, a first expansion valve (24), a receiver (25), a closable valve, and an indoor heat exchanger, wherein a fully closed-type first expansion valve (24) is provided in the refrigerant circuit in a first state of disposition in which refrigerant from a receiver (25) flows in from the needle advancement direction side of a valve seat (55). The first expansion valve (24) provided in the first state of disposition has a spring (62) that biases a needle (61) in the needle advancement direction.

Description

Aircondition

Technical field

The present invention relates to aircondition, particularly have by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, can switch valve, the indoor heat converter aircondition of refrigerant loop that connects and form.

Background technology

In the past, as shown in patent document 1 (Japanese Patent Laid-Open 10-132393 publication), there is the aircondition having and be provided with the refrigerant loop of expansion valve at the upstream side of liquid reservoir and downstream.Specifically, aircondition has the refrigerant loop that compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve (can switch valve), indoor heat converter are connected and formed.

Summary of the invention

Herein, using full cut-off type expansion valve as when being arranged at the expansion valve of the upstream side of liquid reservoir and downstream, if 2 expansion valves are all in full-shut position, then liquid reservoir likely can become fluid-tight state.Herein, " fluid-tight " refers to that the regulation space of refrigerant loop filled up by liquid refrigerant, and liquid refrigerant is in the state of enclosing in regulation space, likely can rise and cause the equipment forming this regulation space to break by Yin Wendu.That is, herein, the part between 2 expansion valves comprising liquid reservoir in refrigerant loop filled up by liquid refrigerant, and liquid refrigerant is in the state of enclosing this part, likely can rise and cause forming the equipment such as the liquid reservoir of this part and break by Yin Wendu.In addition, in the structure of patent document 1, be provided with and cold-producing medium extracted from the upper space of liquid reservoir and is ejected into the playpipe of compressor, also consider to use full cut-off type expansion valve as the extraction valve being arranged at this playpipe, but in the case, if 3 expansion valves are all in full-shut position, then liquid reservoir also likely can become fluid-tight state.In addition, a side in the upstream side and downstream of liquid reservoir arranges full cut-off type expansion valve (such as the 1st expansion valve), the opposing party in the upstream side and downstream of liquid reservoir arranges in the structure of hydraulic fluid side stop valve, if the 1st expansion valve and hydraulic fluid side stop valve are all in full-shut position, then liquid reservoir also likely can become fluid-tight state.

In order to prevent the fluid-tight of this liquid reservoir, need to be arranged so that the fluid-tight that cold-producing medium can be overflowed from the upper space of liquid reservoir at any time prevents pipe in addition, if but arrange this fluid-tight prevent pipe, then can produce the problem of cost increase and installation space, therefore, preferably can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight.

Problem of the present invention is, have by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, can switch valve, indoor heat converter connect and form refrigerant loop aircondition in, full cut-off type expansion valve can be used, and the fluid-tight of liquid reservoir can be prevented and prevent pipe without the need to arranging fluid-tight.

Aircondition involved by 1st viewpoint is have compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, switch valve, indoor heat converter can connect the aircondition of the refrigerant loop formed.Herein, as the 1st expansion valve, use the full cut-off type expansion valve being in full-shut position because needle is resisted against valve seat, and, 1st expansion valve is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, the moving direction of the needle when setting needle to be resisted against valve seat is as needle direction of advance, and set needle away from needle during valve seat moving direction as needle away from direction time, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by the gap between needle and valve seat, needle to valve seat flows out away from side, direction, the 1st expansion valve being arranged at refrigerant loop with the 1st configuration status has will be resisted against the spring of needle towards the effect of needle direction of advance of valve seat when full-shut position, described 1st expansion valve is configured to the pressure of the cold-producing medium in the space of the needle direction of advance side of valve seat, and the needle of valve seat away from the cold-producing medium in the space of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces needle is pressed towards needle away from direction make every effort to overcome the active force towards needle direction of advance taking spring, then remove the state that needle is resisted against valve seat.

When using full cut-off type expansion valve as the 1st expansion valve, even if in order to the 1st expansion valve and full-shut position can be become by switch valve, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight, need to comprise in refrigerant loop liquid reservoir the 1st expansion valve and can the pressure increase of the cold-producing medium that exists of the part between switch valve time, make to comprise the 1st expansion valve of liquid reservoir in refrigerant loop and can escape into the other parts of refrigerant loop by the cold-producing medium that exists of the part between switch valve.

Therefore, herein, as mentioned above, 1st expansion valve is arranged at refrigerant loop with the 1st configuration status, under the 1st configuration status, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by the gap between needle and valve seat, the needle to valve seat flows out away from side, direction.Thus, be arranged in the 1st expansion valve of refrigerant loop with the 1st configuration status, when full-shut position, if the pressure of cold-producing medium produced in the space of the needle direction of advance side of valve seat and the needle of valve seat away from the cold-producing medium in the space of side, direction pressure between pressure differential namely inversely press off valve pressure differential, then the power that needle presses to needle away from direction is worked.Herein, following structure is set: utilize by this inverse power pressing off valve pressure differential and pressed away from direction towards needle by needle, the 1st expansion valve being arranged at refrigerant loop with the 1st configuration status arranges spring, this spring will be resisted against the needle of valve seat towards the effect of needle direction of advance when full-shut position, if press off by inverse needle to be overcome spring by valve pressure differential away from the power that the direction press active force towards needle direction of advance towards needle, then releasing needle is resisted against the state of valve seat.Thus, following structure can be obtained: comprise in refrigerant loop liquid reservoir the 1st expansion valve and can the pressure increase of the cold-producing medium that exists of the part between switch valve time, can make to comprise in refrigerant loop the 1st expansion valve of liquid reservoir and outdoor heat converter side can be escaped into by the cold-producing medium that exists of the part between switch valve.

Like this, in this aircondition, by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, can switch valve, indoor heat converter connect and form refrigerant loop in, even if use full cut-off type expansion valve as the 1st expansion valve, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight.

Aircondition involved by 2nd viewpoint, in the aircondition involved by the 1st viewpoint, can switch valve be hydraulic fluid side stop valve.

That is, refrigerant loop is constructed as follows herein: the side in the upstream side and downstream of liquid reservoir arranges the 1st expansion valve of full cut-off type, and the opposing party in the upstream side and downstream of liquid reservoir arranges hydraulic fluid side stop valve.Therefore, if the 1st expansion valve and hydraulic fluid side stop valve become full-shut position, then liquid reservoir likely becomes fluid-tight state.

Therefore, herein, as mentioned above, 1st expansion valve of full cut-off type is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by the gap between needle and valve seat, the needle to valve seat flows out away from side, direction.Thus, following structure can be obtained: when comprising the pressure increase of the cold-producing medium that the part between the 1st expansion valve of liquid reservoir and hydraulic fluid side stop valve exists in refrigerant loop, can make to comprise in refrigerant loop the cold-producing medium that the part between the 1st expansion valve of liquid reservoir and hydraulic fluid side stop valve exists and escape into outdoor heat converter side.

Like this, in this aircondition, in the refrigerant loop that compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, hydraulic fluid side stop valve, indoor heat converter are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight.

Aircondition involved by 3rd viewpoint, in the aircondition involved by the 1st viewpoint, can switch valve be the 2nd expansion valve, as the 2nd expansion valve, use the full cut-off type expansion valve being in full-shut position because needle is resisted against valve seat.In the case, at least one in 1st expansion valve and the 2nd expansion valve is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, the moving direction of the needle when setting needle to be resisted against valve seat as needle direction of advance and set needle away from needle during valve seat moving direction as needle away from direction time, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by needle and described between gap, the needle to valve seat flows out away from side, direction.Be arranged at the 1st expansion valve of refrigerant loop and/or the 2nd expansion valve with the 1st configuration status to have and will be resisted against the spring of needle towards the effect of needle direction of advance of valve seat when full-shut position, described 1st expansion valve and/or the 2nd expansion valve are configured to the pressure of the cold-producing medium in the space of the needle direction of advance side of valve seat, and the needle of valve seat away from the cold-producing medium in the space of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces needle is pressed towards needle away from direction make every effort to overcome the active force towards needle direction of advance taking spring, then remove the state that needle is resisted against valve seat.

That is, be constructed as follows refrigerant loop herein: the side in the upstream side and downstream of liquid reservoir arranges the 1st expansion valve of full cut-off type, the opposing party in the upstream side and downstream of liquid reservoir arranges the 2nd expansion valve of full cut-off type.Like this, when using full cut-off type expansion valve as the 1st expansion valve and the 2nd expansion valve, even if in order to 2 expansion valves become full-shut position, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight, when needing the pressure increase comprising the cold-producing medium that the part between 2 expansion valves of liquid reservoir exists in refrigerant loop, make the cold-producing medium of the part existence comprised in refrigerant loop between 2 expansion valves of liquid reservoir can escape into the other parts of refrigerant loop.

Therefore, herein, as mentioned above, at least one in 1st expansion valve and the 2nd expansion valve is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by the gap between needle and valve seat, the needle to valve seat flows out away from side, direction.Thus, in the 1st expansion valve being arranged at refrigerant loop with the 1st configuration status and/or the 2nd expansion valve, when full-shut position, if the pressure of cold-producing medium in the space of the needle direction of advance side of valve seat and produce between the pressure of the needle of valve seat away from the cold-producing medium in the space of side, direction that pressure differential is namely inverse presses off valve pressure differential, then the power that needle presses to needle away from direction is worked.Herein, following structure is set: utilize by this inverse power pressing off valve pressure differential and pressed away from direction towards needle by needle, the 1st expansion valve being arranged at refrigerant loop with the 1st configuration status and/or the 2nd expansion valve arrange spring, this spring will be resisted against the needle of valve seat towards the effect of needle direction of advance when full-shut position, if press off by inverse needle to be overcome spring by valve pressure differential away from the power that the direction press active force towards needle direction of advance towards needle, then releasing needle is resisted against the state of valve seat.Thus, following structure can be obtained: during the pressure increase of the cold-producing medium that the part between 2 expansion valves comprising liquid reservoir in refrigerant loop exists, can make to comprise in refrigerant loop the cold-producing medium that the part between 2 expansion valves of liquid reservoir exists and escape into outdoor heat converter side, indoor heat converter side.

Like this, in this aircondition, in the refrigerant loop that compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve, indoor heat converter are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve and the 2nd expansion valve, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight.

Aircondition involved by 4th viewpoint is in aircondition involved any one of the 1st ~ 3rd viewpoint, the active force of spring during setting full-shut position, make to arrange liquid reservoir, the 1st expansion valve and can environment temperature in the place of switch valve the cold-producing medium corresponding to peak saturation pressure i.e. most High saturation pressure, be below the resistance to pressure pressure of liquid reservoir with the inverse summation pressing off valve pressure differential.

Herein, as mentioned above, the active force of spring during setting full-shut position, make to arrange the 1st expansion valve and can environment temperature in the place of switch valve the cold-producing medium corresponding to peak saturation pressure i.e. most High saturation pressure, be below the resistance to pressure pressure of liquid reservoir with the inverse summation pressing off valve pressure differential.Thus, even if when suppose to comprise in refrigerant loop liquid reservoir the 1st expansion valve and can the cold-producing medium that exists of the part between switch valve rise to the condition of the environment temperature of most High saturation pressure such high temperature, before exceeding the resistance to pressure pressure of liquid reservoir, by inverse press off that valve pressure differential produces needle is pressed towards needle away from direction make every effort to overcome the active force towards needle direction of advance taking spring, thus the state that needle is resisted against valve seat can be removed.Therefore, for comprise in refrigerant loop liquid reservoir the 1st expansion valve and can the cold-producing medium that exists of the part between switch valve, before exceeding the resistance to pressure pressure of liquid reservoir, make it escape into outdoor heat converter side, indoor heat converter side, the fluid-tight of liquid reservoir can be prevented.

Like this, in this aircondition, can consider that the resistance to pressure pressure of liquid reservoir suitably prevents the fluid-tight of liquid reservoir.

Aircondition involved by 5th viewpoint is in the aircondition involved by the 1st viewpoint, refrigerant loop also has the extraction valve for extracting cold-producing medium out from the upper space of liquid reservoir, as extraction valve, use the full cut-off type expansion valve being in full-shut position because needle is resisted against valve seat.In the case, at least one in 1st expansion valve and extraction valve is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, the moving direction of the needle when setting needle to be resisted against valve seat as needle direction of advance and set needle away from needle during valve seat moving direction as needle away from direction time, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by needle and described between gap, the needle to valve seat flows out away from side, direction.Be arranged at the 1st expansion valve of refrigerant loop and/or extraction valve with the 1st configuration status to have and will be resisted against the spring of needle towards the effect of needle direction of advance of valve seat when full-shut position, described 1st expansion valve and/or extraction valve are configured to the pressure of the cold-producing medium in the space of the needle direction of advance side of valve seat, and the needle of valve seat away from the cold-producing medium in the space of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces needle is pressed towards needle away from direction make every effort to overcome the active force towards needle direction of advance taking spring, then remove the state that needle is resisted against valve seat.

That is, be constructed as follows refrigerant loop herein: the side in the upstream side and downstream of liquid reservoir arranges the 1st expansion valve of full cut-off type, the opposing party in the upstream side and downstream of liquid reservoir is arranged can switch valve, arranges the extraction valve of full cut-off type at liquid reservoir.Like this, when using full cut-off type expansion valve as the 1st expansion valve and extraction valve, even if in order to the 1st expansion valve, switch valve and extraction valve full-shut position can be become, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight, need to comprise in refrigerant loop the 1st expansion valve of liquid reservoir, can the pressure increase of the cold-producing medium that exists of the part between switch valve and extraction valve time, make to comprise the 1st expansion valve of liquid reservoir in refrigerant loop, can escape into the other parts of refrigerant loop by the cold-producing medium that exists of the part between switch valve and extraction valve.

Therefore, herein, as mentioned above, at least one in 1st expansion valve and extraction valve is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by the gap between needle and valve seat, the needle to valve seat flows out away from side, direction.Thus, in the 1st expansion valve being arranged at refrigerant loop with the 1st configuration status and/or extraction valve, when full-shut position, if the pressure of cold-producing medium in the space of the needle direction of advance side of valve seat and produce between the pressure of the needle of valve seat away from the cold-producing medium in the space of side, direction that pressure differential is namely inverse presses off valve pressure differential, then the power that needle presses to needle away from direction is worked.Herein, following structure is set: utilize by this inverse power pressing off valve pressure differential and pressed away from direction towards needle by needle, the spring of needle towards the effect of needle direction of advance of valve seat will be resisted against when the 1st expansion valve being arranged at refrigerant loop with the 1st configuration status and/or extraction valve arrange full-shut position, if by inverse press off that needle press towards needle away from direction by valve pressure differential make every effort to overcome the active force towards needle direction of advance taking spring, then releasing needle is resisted against the state of valve seat.Thus, following structure can be obtained: comprise in refrigerant loop the 1st expansion valve of liquid reservoir, can the pressure increase of the cold-producing medium that exists of the part between switch valve and extraction valve time, can make to comprise in refrigerant loop the 1st expansion valve of liquid reservoir, outdoor heat converter side, indoor heat converter side, compressor side can be escaped into by the cold-producing medium that exists of the part between switch valve and extraction valve.

Like this, in this aircondition, by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, can switch valve, indoor heat converter, extraction valve connect and form refrigerant loop in, even if use full cut-off type expansion valve as the 1st expansion valve and extraction valve, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight.

Aircondition involved by 6th viewpoint, in the aircondition involved by the 5th viewpoint, can switch valve be hydraulic fluid side stop valve.

Therefore, herein, as mentioned above, 1st expansion valve of full cut-off type and/or extraction valve are arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by the gap between needle and valve seat, the needle to valve seat flows out away from side, direction.Thus, following structure can be obtained: when comprising the pressure increase of the cold-producing medium that part between the 1st expansion valve of liquid reservoir, hydraulic fluid side stop valve and extraction valve exists in refrigerant loop, can make to comprise in refrigerant loop the cold-producing medium that the part between the 1st expansion valve of liquid reservoir, hydraulic fluid side stop valve and extraction valve exists and escape into outdoor heat converter side, compressor side.

Like this, in this aircondition, in the refrigerant loop that compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, hydraulic fluid side stop valve, indoor heat converter, extraction valve are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve and extraction valve, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight.

Aircondition involved by 7th viewpoint is in the aircondition involved by the 1st viewpoint, can switch valve be the 2nd expansion valve, refrigerant loop also has the extraction valve for extracting cold-producing medium out from the upper space of liquid reservoir, as the 2nd expansion valve and extraction valve, use the full cut-off type expansion valve being in full-shut position because needle is resisted against valve seat.In the case, at least one in 1st expansion valve, the 2nd expansion valve and extraction valve is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, the moving direction of the needle when setting needle to be resisted against valve seat as needle direction of advance and set needle away from needle during valve seat moving direction as needle away from direction time, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by needle and described between gap, the needle to valve seat flows out away from side, direction.The 1st expansion valve of refrigerant loop is arranged at the 1st configuration status, 2nd expansion valve and/or extraction valve have will be resisted against the spring of needle towards the effect of needle direction of advance of valve seat when full-shut position, described 1st expansion valve, 2nd expansion valve and/or extraction valve are configured to the pressure of the cold-producing medium in the space of the needle direction of advance side of valve seat, and the needle of valve seat away from the cold-producing medium in the space of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces needle is pressed towards needle away from direction make every effort to overcome the active force towards needle direction of advance taking spring, then remove the state that needle is resisted against valve seat.

That is, refrigerant loop is constructed as follows herein: the 1st and the 2nd expansion valve arranging full cut-off type at the upstream side of liquid reservoir and downstream, arranges the extraction valve of full cut-off type at liquid reservoir.Like this, at use full cut-off type expansion valve as the 1st expansion valve, when the 2nd expansion valve and extraction valve, even if in order to the 1st expansion valve, 2nd expansion valve and extraction valve become full-shut position, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight, need the 1st expansion valve comprising liquid reservoir in refrigerant loop, during the pressure increase of the cold-producing medium that the part between the 2nd expansion valve and extraction valve exists, make the 1st expansion valve comprising liquid reservoir in refrigerant loop, the cold-producing medium that part between 2nd expansion valve and extraction valve exists can escape into the other parts of refrigerant loop.

Therefore, herein, as mentioned above, at least one in 1st expansion valve, the 2nd expansion valve and extraction valve is arranged at refrigerant loop with the 1st configuration status, under 1st configuration status, from the cold-producing medium of liquid reservoir from needle direction of advance one side inflow of valve seat, by the gap between needle and valve seat, the needle to valve seat flows out away from side, direction.Thus, be arranged in the 1st expansion valve of refrigerant loop, the 2nd expansion valve and/or extraction valve with the 1st configuration status, when full-shut position, if the pressure of cold-producing medium in the space of the needle direction of advance side of valve seat and produce between the pressure of the needle of valve seat away from the cold-producing medium in the space of side, direction that pressure differential is namely inverse presses off valve pressure differential, then the power that needle presses to needle away from direction is worked.Herein, following structure is set: utilize by this inverse power pressing off valve pressure differential and pressed away from direction towards needle by needle, the spring of needle towards the effect of needle direction of advance of valve seat will be resisted against when being arranged at the 1st configuration status and the 1st expansion valve of refrigerant loop, the 2nd expansion valve and/or extraction valve arranging full-shut position, if by inverse press off that needle press towards needle away from direction by valve pressure differential make every effort to overcome the active force towards needle direction of advance taking spring, then releasing needle is resisted against the state of valve seat.Thus, following structure can be obtained: when comprising the pressure increase of the cold-producing medium that part between the 1st expansion valve of liquid reservoir, the 2nd expansion valve and extraction valve exists in refrigerant loop, can make to comprise in refrigerant loop the cold-producing medium that the part between the 1st expansion valve of liquid reservoir, the 2nd expansion valve and extraction valve exists and escape into outdoor heat converter side, indoor heat converter side, compressor side.

Like this, in this aircondition, in the refrigerant loop that compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve, indoor heat converter, extraction valve are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve, the 2nd expansion valve and extraction valve, also can prevent the fluid-tight of liquid reservoir and prevent pipe without the need to arranging fluid-tight.

Aircondition involved by 8th viewpoint is in aircondition involved any one of the 5th ~ 7th viewpoint, the active force of spring during setting full-shut position, make to arrange liquid reservoir, the 1st expansion valve, can environment temperature in the place of switch valve and extraction valve the cold-producing medium corresponding to peak saturation pressure i.e. most High saturation pressure, be below the resistance to pressure pressure of liquid reservoir with the inverse summation pressing off valve pressure differential.

Herein, as mentioned above, the active force of spring during setting full-shut position, make to arrange the 1st expansion valve, can environment temperature in the place of switch valve and extraction valve the cold-producing medium corresponding to peak saturation pressure i.e. most High saturation pressure, be below the resistance to pressure pressure of liquid reservoir with the inverse summation pressing off valve pressure differential.Thus, even if when suppose to comprise in refrigerant loop liquid reservoir the 1st expansion valve, can the cold-producing medium that exists of the part between switch valve and extraction valve rise to the condition of the environment temperature of most High saturation pressure such high temperature, before exceeding the resistance to pressure pressure of liquid reservoir, by inverse press off that valve pressure differential produces needle is pressed towards needle away from direction make every effort to overcome the active force towards needle direction of advance taking spring, thus the state that needle is resisted against valve seat can be removed.Therefore, for comprise in refrigerant loop liquid reservoir the 1st expansion valve, can the cold-producing medium that exists of the part between switch valve and extraction valve, before exceeding the resistance to pressure pressure of liquid reservoir, make it escape into outdoor heat converter side, indoor heat converter side, compressor side, the fluid-tight of liquid reservoir can be prevented.

Aircondition involved by 9th viewpoint is in the aircondition involved by the 4th or the 8th viewpoint, and the resistance to pressure pressure of liquid reservoir is the design pressure of liquid reservoir is multiplied by the force value that safety coefficient obtains.

Herein, the design pressure based on liquid reservoir obtains resistance to pressure pressure, therefore, can suitably set arrange with the 1st configuration status the 1st expansion valve, the 2nd expansion valve and/or extraction valve inverse press off valve pressure differential, namely full-shut position time the active force of spring.

Aircondition involved by 10th viewpoint is in the aircondition involved by the 1st or the 5th viewpoint, can be the 2nd expansion valve and be connected to the 2nd hydraulic fluid side stop valve between expansion valve and indoor heat converter by switch valve, as the 2nd expansion valve, use the full cut-off type expansion valve being in full-shut position because needle is resisted against valve seat.Herein, 2nd expansion valve is arranged at refrigerant loop with the 2nd configuration status, under the 2nd configuration status, from the cold-producing medium of liquid reservoir from the needle of valve seat away from direction one side inflow, by the gap between needle and valve seat, the needle direction of advance side to valve seat is flowed out.The 2nd expansion valve being arranged at refrigerant loop with the 2nd configuration status has will be resisted against the spring of needle towards the effect of needle direction of advance of valve seat when full-shut position, described 2nd expansion valve is configured to the pressure of the cold-producing medium in the space of the needle direction of advance side of valve seat, and the needle of valve seat away from the cold-producing medium in the space of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces needle is pressed towards needle away from direction make every effort to overcome the active force towards needle direction of advance taking spring, then remove the state that needle is resisted against valve seat.

When using full cut-off type expansion valve as the 2nd expansion valve, if due to hydraulic fluid side stop valve, the 2nd expansion valve maloperation etc. and cause hydraulic fluid side stop valve and the 2nd expansion valve both sides all to become full-shut position, then likely can there is fluid-tight in the part in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve.Namely, herein, part in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve filled up by liquid refrigerant, and liquid refrigerant is in the state of enclosing this part, likely can rise and cause the equipment such as hydraulic fluid side stop valve, the 2nd expansion valve forming this part to break by Yin Wendu.In order to prevent the fluid-tight of the part between this hydraulic fluid side stop valve and the 2nd expansion valve, during the pressure increase of the cold-producing medium of the part in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve, need the cold-producing medium that the part in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve is existed can escape into the other parts of refrigerant loop.

Therefore, herein, as mentioned above, by by the 1st expansion valve (when also there is extraction valve, be the 1st expansion valve and/or extraction valve) be arranged at refrigerant loop to prevent the fluid-tight of liquid reservoir with the 1st configuration status, and, refrigerant loop is arranged at the 2nd configuration status through the 2nd expansion valve, under 2nd configuration status, from the cold-producing medium of liquid reservoir from the needle of valve seat away from direction one side inflow, by the gap between needle and valve seat, the needle direction of advance side to valve seat is flowed out.Thus, in the 2nd expansion valve, when full-shut position, if the pressure of cold-producing medium produced in the space of the needle direction of advance side of valve seat and the needle of valve seat away from the cold-producing medium in the space of side, direction pressure between pressure differential namely inversely press off valve pressure differential, then the power that needle presses to needle away from direction is worked.Herein, following structure is set: utilize by this inverse power pressing off valve pressure differential and pressed away from direction towards needle by needle, the 2nd expansion valve being arranged at refrigerant loop with the 2nd configuration status arranges spring, this spring will be resisted against the needle of valve seat towards the effect of needle direction of advance when full-shut position, if by inverse press off that needle press towards needle away from direction by valve pressure differential make every effort to overcome the active force towards needle direction of advance taking spring, then releasing needle is resisted against the state of valve seat.Thus, following structure can be obtained: during the pressure increase of the cold-producing medium of the part in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve, the cold-producing medium that the part in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve can be made to exist escapes into liquid reservoir side.

Like this, in this aircondition, at the refrigerant loop that compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve, hydraulic fluid side stop valve, indoor heat converter are connected and form (when also there is extraction valve, also extraction valve is comprised) in, the fluid-tight of liquid reservoir can be prevented and prevent pipe without the need to arranging fluid-tight, further, the fluid-tight between hydraulic fluid side stop valve and the 2nd expansion valve can be prevented.

Aircondition involved by 11st viewpoint is in the aircondition involved by the 10th viewpoint, the active force of the spring of the 2nd expansion valve during setting full-shut position, make the saturation pressure of the cold-producing medium corresponding to peak of the environment temperature arranged in the place of the 2nd expansion valve and hydraulic fluid side stop valve i.e. most High saturation pressure, with the inverse summation pressing off valve pressure differential of the 2nd expansion valve be, to form in refrigerant loop below the minimum of a value of the resistance to pressure pressure of the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side.

Herein, as mentioned above, the active force of spring during setting full-shut position, make the saturation pressure of the cold-producing medium corresponding to peak of the environment temperature arranged in the place of the 2nd expansion valve i.e. most High saturation pressure, with the inverse summation pressing off valve pressure differential be, to form in refrigerant loop below the minimum of a value of the resistance to pressure pressure of the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side.Thus, even if when the cold-producing medium that the part supposed in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve exists rises to the condition of the environment temperature of the most such high temperature of High saturation pressure, form in refrigerant loop from before the minimum of a value of the resistance to pressure pressure of the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side exceeding, by the inverse active force towards needle direction of advance that needle can be overcome spring towards needle away from the power that direction presses pressing off valve pressure differential and produce, thus the state that needle is resisted against valve seat can be removed.Therefore, for the cold-producing medium that hydraulic fluid side stop valve in refrigerant loop and the part between the 2nd expansion valve exist, form in refrigerant loop from before the resistance to pressure pressure of the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side exceeding, make it escape into liquid reservoir side, the fluid-tight between hydraulic fluid side stop valve and the 2nd expansion valve can be prevented.Herein, the cold-producing medium escaping into liquid reservoir side likely can cause the pressure increase of liquid reservoir, but owing to (also be there is extraction valve in the 1st expansion valve, be the 1st expansion valve and/or extraction valve) with the 1st configuration status arrange when, before exceeding the resistance to pressure pressure of liquid reservoir, it can be made to escape into outdoor heat converter side (when also there is extraction valve, being outdoor heat converter side, compressor side).

Like this, in this aircondition, the fluid-tight of liquid reservoir can be prevented and prevent pipe without the need to arranging fluid-tight, and, can consider to form the resistance to pressure pressure from the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side in refrigerant loop, suitably prevent the fluid-tight between hydraulic fluid side stop valve and the 2nd expansion valve.

Aircondition involved by 12nd viewpoint is in the aircondition involved by the 11st viewpoint, form in refrigerant loop and from the resistance to pressure pressure of the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side be, the force value obtained being multiplied by safety coefficient from the design pressure of the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side in formation refrigerant loop.

Elsewhere, owing to obtaining resistance to pressure pressure based in formation refrigerant loop from the design pressure of the parts of the part of the 2nd expansion valve to the stop valve of hydraulic fluid side, therefore, suitably can set the 2nd expansion valve arranged with the 2nd configuration status inverse press off valve pressure differential, namely full-shut position time the active force of spring.

Accompanying drawing explanation

Fig. 1 is the brief configuration figure of the aircondition of one embodiment of the present invention.

Fig. 2 represents the figure near the 1st expansion valve, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Fig. 3 is the diagrammatic cross-sectional view of expansion valve.

Fig. 4 is the diagrammatic cross-sectional view near the needle of the expansion valve (do not worked against pressing off valve) when representing full-shut position.

Fig. 5 is the diagrammatic cross-sectional view near the needle of the expansion valve of (against pressing off valve work) when representing full-shut position.

Fig. 6 represents the figure near the 1st expansion valve of variation 1, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Fig. 7 represents the figure near the 1st expansion valve of variation 1, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Fig. 8 is the brief configuration figure of the aircondition of variation 2.

Fig. 9 is the brief configuration figure of the aircondition of variation 3.

Figure 10 represents the figure near the 1st expansion valve of variation 3, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Figure 11 represents the figure near the 1st expansion valve of variation 3, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Figure 12 represents the figure near the 1st expansion valve of variation 3, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Figure 13 represents the figure near the 1st expansion valve of variation 3, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Figure 14 represents the figure near the 1st expansion valve of variation 3, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Figure 15 represents the figure near the 1st expansion valve of variation 3, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Figure 16 represents the figure near the 1st expansion valve of variation 3, liquid reservoir, the 2nd expansion valve and hydraulic fluid side stop valve.

Figure 17 is the brief configuration figure of the aircondition of variation 5.

Figure 18 is the brief configuration figure of the aircondition of variation 5.

Figure 19 represents the figure near the 1st expansion valve of variation 5, liquid reservoir and hydraulic fluid side stop valve.

Figure 20 represents the figure near the 1st expansion valve of variation 5, liquid reservoir and hydraulic fluid side stop valve.

Figure 21 represents the figure near the 1st expansion valve of variation 5, liquid reservoir and hydraulic fluid side stop valve.

Figure 22 represents the figure near the 1st expansion valve of variation 5, liquid reservoir and hydraulic fluid side stop valve.

Detailed description of the invention

Below, embodiment and the variation thereof of aircondition of the present invention are described based on accompanying drawing.In addition, the concrete structure of aircondition of the present invention is not limited to following embodiment and variation thereof, can change in the scope not departing from invention main points.

(1) structure of aircondition

Fig. 1 is the brief configuration figure of the aircondition 1 of one embodiment of the present invention.

Aircondition 1 is the freeze cycle by carrying out steam compression type, the refrigeration that can carry out the indoor of building etc. and the device heated.Aircondition 1 is formed mainly through being connected with indoor unit 4 by outdoor unit 2.Herein, outdoor unit 2 and indoor unit 4 are via being connected liquid refrigerant communicating pipe 5 and gas refrigerant communicating pipe 6.That is, the refrigerant loop 10 of the steam compression type of aircondition 1 is formed by making outdoor unit 2 and indoor unit 4 be connected via cold-producing medium communicating pipe 5,6.In addition, as the cold-producing medium enclosed in this refrigerant loop 10, various cold-producing medium can be used, herein, as cold-producing medium, enclose the R32 as a kind of HFC class cold-producing medium.

< indoor unit >

Indoor unit 4 is arranged at indoor, forms a part for refrigerant loop 10.Indoor unit 4 mainly has indoor heat converter 41.

Indoor heat converter 41 cools room air for the effect played when cooling operation as the evaporimeter of cold-producing medium, plays the effect as the radiator of cold-producing medium and the heat exchanger heated room air when heating running.The hydraulic fluid side of indoor heat converter 41 is connected to liquid refrigerant communicating pipe 5, and the gas side of indoor heat converter 41 is connected to gas refrigerant communicating pipe 6.

Indoor unit 4 has for being drawn in indoor unit 4 by room air, and after making it carry out heat exchange with cold-producing medium in indoor heat converter 41, supply air is supplied to indoor indoor fan 42.Indoor fan 42 is driven by indoor fan motor 43.

Indoor unit 4 has the indoor control part 44 of the action controlling each portion forming indoor unit 4.The microcomputer that indoor control part 44 has the control in order to carry out indoor unit 4 and arranges, memory etc., can and remote controller (not shown) between carry out the exchange of control signal etc., or and outdoor unit 2 between to carry out the exchange of control signal etc. via conveyer line 8a.

< outdoor unit >

Outdoor unit 2 is arranged at outdoor, forms a part for refrigerant loop 10.Outdoor unit 2 mainly has compressor 21, four-way switching valve 22, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (can switch valve), hydraulic fluid side stop valve 27 (can switch valve) and gas side stop valve 28.

Compressor 21 is by the equipment of the refrigerant compression of the low pressure in freeze cycle to high pressure.Compressor 21 has the closed structure by electric motor for compressor 21a rotary actuation, and this electric motor for compressor 21a utilizes the compression key element (not shown) of the rotary or vortex isometric(al) formula of inverter control.The suction side of compressor 21 is connected with suction line 31, and discharge side is connected with discharge pipe 32.Suction line 31 is the refrigerant pipe be connected with the 1st port 22a of four-way switching valve 22 suction side of compressor 21.Suction line 31 is provided with storage tank 29.Discharge pipe 32 is the refrigerant pipe discharge side of compressor 21 be connected with the 2nd port 22b of four-way switching valve 22.Discharge pipe 32 is provided with check-valves 32a.

Four-way switching valve 22 is the transfer valve of the flow direction for switching the cold-producing medium in refrigerant loop 10.Four-way switching valve 22 carries out the switching to kind of refrigeration cycle state when cooling operation, under this kind of refrigeration cycle state, make outdoor heat converter 23 play the effect of the radiator as the cold-producing medium compressed in compressor 21, and make indoor heat converter 41 play the effect of the evaporimeter as the cold-producing medium dispelled the heat in outdoor heat converter 23.That is, four-way switching valve 22 carries out when cooling operation making the 2nd port 22b be communicated with the 3rd port 22c and make the switching that the 1st port 22a is communicated with the 4th port 22d.Thus, the discharge side (being herein discharge pipe 32) of compressor 21 is connected (solid line of the four-way switching valve 22 of reference Fig. 1) herein with the gas side (being the 1st gas refrigerant pipe 33) of outdoor heat converter 23.And be connected with gas refrigerant communicating pipe 6 side (being the 2nd gas refrigerant pipe 34) herein (solid line with reference to the four-way switching valve 22 of Fig. 1) in the suction side (being suction line 31) of compressor 21 herein.Four-way switching valve 22 carries out the switching to heating recurrent state when heating running, under this heats recurrent state, make outdoor heat converter 23 play the effect of the evaporimeter as the cold-producing medium dispelled the heat in outdoor heat converter 41, and make indoor heat converter 41 play the effect of the radiator as the cold-producing medium compressed in compressor 21.That is, four-way switching valve 22 carries out when heating running making the 2nd port 22b be communicated with the 4th port 22d and make the switching that the 1st port 22a is communicated with the 3rd port 22c.And be connected with gas refrigerant communicating pipe 6 side (being the 2nd gas refrigerant pipe 34) herein the discharge side (being discharge pipe 32) of compressor 21 (dotted line with reference to the four-way switching valve 22 of Fig. 1) herein.And be connected with the gas side (being the 1st gas refrigerant pipe 33) of outdoor heat converter 23 herein (dotted line with reference to the four-way switching valve 22 of Fig. 1) in the suction side (being suction line 31) of compressor 21 herein.1st gas refrigerant pipe 33 is the refrigerant pipe the 3rd port 22c of four-way switching valve 22 and the gas side of outdoor heat converter 23 being carried out being connected.2nd gas refrigerant pipe 33 is the refrigerant pipe the 4th port 22d of four-way switching valve 22 and gas refrigerant communicating pipe 6 side being carried out being connected.

Outdoor heat converter 23 is play when cooling operation as using the effect of outdoor air as the radiator of the cold-producing medium of cooling source, plays the heat exchanger of outdoor air as the effect of the evaporimeter of the cold-producing medium of heating source when heating running.The hydraulic fluid side of outdoor heat converter 23 is connected to liquid refrigerant pipe 35, and gas side is connected to the 1st gas refrigerant pipe 33.Liquid refrigerant pipe 35 is the refrigerant pipe being carried out in the hydraulic fluid side of outdoor heat converter 23 and liquid refrigerant communicating pipe 5 side being connected.

1st expansion valve 24 is the valve the middle pressure reduced pressure to by the cold-producing medium of the high pressure in the freeze cycle of heat radiation in outdoor heat converter 23 in freeze cycle when cooling operation.1st expansion valve 24 is the valve the low pressure reduced pressure in freeze cycle by the cold-producing medium of the middle pressure in the freeze cycle of storage in liquid reservoir 25 when heating running.1st expansion valve 24 is arranged at the part in liquid refrigerant pipe 35 between outdoor heat converter 23 and liquid reservoir 25.Herein, part outdoor heat converter 23 and the 1st expansion valve 24 being carried out being connected in liquid refrigerant pipe 35 is the 1st liquid refrigerant pipe 35a, is the 2nd liquid refrigerant pipe 35b by the part that the 1st expansion valve 24 and liquid reservoir 25 carry out being connected in liquid refrigerant pipe 35.In addition, herein, use electric expansion valve as the 1st expansion valve 24.In addition, the detailed construction about the 1st expansion valve 24 will be set forth below.

Liquid reservoir 25 is arranged between the 1st expansion valve 24 and the 2nd expansion valve 26.Liquid reservoir 25 is for storing the container of the cold-producing medium of the middle pressure in freeze cycle when cooling operation and when heating running.

2nd expansion valve 26 (can switch valve) is the valve the low pressure reduced pressure in freeze cycle by the cold-producing medium of pressure in the middle of in the freeze cycle of storage in liquid reservoir 25 when cooling operation.2nd expansion valve 26 is the valve the middle pressure reduced pressure to by the cold-producing medium of the high pressure in the freeze cycle of heat radiation in indoor heat converter 41 in freeze cycle when heating running.2nd expansion valve 26 is arranged at the part in liquid refrigerant pipe 35 between liquid reservoir 25 and hydraulic fluid side stop valve 27.Herein, part liquid reservoir 25 and the 2nd expansion valve 26 being carried out being connected in liquid refrigerant pipe 35 is the 3rd liquid refrigerant pipe 35c, is the 4th liquid refrigerant pipe 35d by the part that the 2nd expansion valve 26 and hydraulic fluid side stop valve 27 carry out being connected in liquid refrigerant pipe 35.In addition, herein, use electric expansion valve as the 2nd expansion valve 26.In addition, the detailed construction about the 2nd expansion valve 26 will be set forth below.

Hydraulic fluid side stop valve 27 (can switch valve) and gas side stop valve 28 are for being arranged on the valve with the connector of the equipment of outside, pipe arrangement (being specifically liquid refrigerant communicating pipe 5 and gas refrigerant communicating pipe 6).Hydraulic fluid side stop valve 27 is arranged on the end of liquid refrigerant pipe 35 (being more specifically the 4th liquid refrigerant pipe 35d).Gas side stop valve 28 is arranged on the end of the 2nd gas refrigerant pipe 34.

Outdoor unit 2 has for being drawn in outdoor unit 2 by outdoor air, the outdoor fan 36 be discharged to the outside after making it carry out heat exchange with cold-producing medium in outdoor heat converter 23.Outdoor fan 36 is driven by outdoor fan motor 37.

Outdoor unit 2 has the outside control part 38 of the action controlling each portion forming outdoor unit 2.The microcomputer that outside control part 38 has the control in order to carry out outdoor unit 2 and arranges, memory etc., can and indoor unit 4 between to carry out the exchange of control signal etc. via transmission line 8a.

< cold-producing medium communicating pipe >

Cold-producing medium communicating pipe 5,6 is the refrigerant pipe of constructing at the scene when aircondition 1 is arranged on the setting place such as building, uses the cold-producing medium communicating pipe according to setting model such as the combinations of setting place, outdoor unit and indoor unit with various length and caliber.

As mentioned above, by being connected outdoor unit 2, indoor unit 4, cold-producing medium communicating pipe 5,6, form the refrigerant loop 10 of aircondition 1.Aircondition 1 by four-way switching valve 22 is switched to kind of refrigeration cycle state, thus carries out making cold-producing medium according to the sequential loop ground cooling operation of compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (can switch valve), hydraulic fluid side stop valve 27 (can switch valve), indoor heat converter 41.In addition, aircondition 1 heats recurrent state by being switched to by four-way switching valve 22, thus carries out making cold-producing medium to heat running according to the sequential loop of compressor 21, indoor heat converter 41, hydraulic fluid side stop valve 26 (can switch valve), the 2nd expansion valve 26 (can switch valve), liquid reservoir 25, the 1st expansion valve 24, outdoor heat converter 23.In addition, herein, be configured to switch cooling operation and heat running to operate, but also can there is no four-way switching valve, and be configured to only can carry out cooling operation or only can carry out heating running.

< control part >

Aircondition 1 can utilize the control part 8 be made up of indoor control part 44 and outside control part 38, carries out the control of each equipment of outdoor unit 2 and indoor unit 4.That is, utilize the transmission line 8a that will connect between indoor control part 44 and outside control part 38, form the control part 8 carrying out comprising above-mentioned cooling operation, heat control such as the overall operation of the aircondition 1 of running etc.

(2) elemental motion of aircondition

Next, the elemental motion of Fig. 1 to aircondition 1 is utilized to be described.In aircondition 1, as elemental motion, can cooling operation be carried out and heat running.

< heats running >

When heating running, four-way switching valve 22 switches to and heats recurrent state (state shown in the dotted line of Fig. 1).

In refrigerant loop 10, the gas refrigerant of the low pressure in freeze cycle is inhaled into compressor 21, be compressed to freezing in proper order in high pressure till after discharge.

Indoor heat converter 41 is sent to by four-way switching valve 22, gas side stop valve 28 and gas refrigerant communicating pipe 6 from the gas refrigerant of the high pressure of compressor 21 discharge.

The gas refrigerant being sent to the high pressure of indoor heat converter 41 in indoor heat converter 41 with carry out heat exchange by indoor fan 42 as the room air that cooling source provides and dispel the heat, become the liquid refrigerant of high pressure.Thus, room air is heated, and is supplied to indoor afterwards, carries out indoor heating thus.

The liquid refrigerant of the high pressure in indoor heat converter 41 after heat radiation is sent to the 2nd expansion valve 26 by liquid refrigerant communicating pipe 5 and hydraulic fluid side stop valve 27.

The middle pressure that the liquid refrigerant being sent to the high pressure of the 2nd expansion valve 26 is reduced pressure in freeze cycle by the 2nd expansion valve 26, become the cold-producing medium of the gas-liquid two-phase state of middle pressure.

In the middle of post-decompression by the 2nd expansion valve 26, the cold-producing medium of the gas-liquid two-phase state of pressure is temporarily stored in liquid reservoir 25, afterwards, is sent to the 1st expansion valve 24.

The low pressure that the cold-producing medium being sent to the gas-liquid two-phase state of the middle pressure of the 1st expansion valve 24 is reduced pressure in freeze cycle by the 1st expansion valve 24, become the cold-producing medium of the gas-liquid two-phase state of low pressure.

Outdoor heat converter 23 is sent to by the cold-producing medium of the gas-liquid two-phase state of the post-decompression low pressure of the 1st expansion valve 24.

The cold-producing medium being sent to the gas-liquid two-phase state of the low pressure of outdoor heat converter 23 in outdoor heat converter 23 with carry out heat exchange by outdoor fan 36 as the outdoor air that heating source provides and evaporate, become the gas refrigerant of low pressure.

In outdoor heat converter 23, the cold-producing medium of the low pressure of evaporation is inhaled into compressor 21 again by four-way switching valve 22.

< cooling operation >

When cooling operation, four-way switching valve 22 switches to kind of refrigeration cycle state (state shown in the solid line of Fig. 1).

Outdoor heat converter 23 is sent to by four-way switching valve 22 from the gas refrigerant of the high pressure of compressor 21 discharge.

The gas refrigerant being sent to the high pressure of outdoor heat converter 23 in outdoor heat converter 23 with carry out heat exchange by outdoor fan 36 as the outdoor air that cooling source provides and dispel the heat, become the liquid refrigerant of high pressure.

The liquid refrigerant of the high pressure in outdoor heat converter 23 after heat radiation is sent to the 1st expansion valve 24.

The middle pressure that the liquid refrigerant being sent to the high pressure of the 1st expansion valve 24 is reduced pressure in freeze cycle by the 1st expansion valve 24, become the cold-producing medium of the gas-liquid two-phase state of middle pressure.

In the middle of post-decompression by the 1st expansion valve 24, the cold-producing medium of the gas-liquid two-phase state of pressure is temporarily stored in liquid reservoir 25, afterwards, is sent to the 2nd expansion valve 26.

The low pressure that the cold-producing medium being sent to the gas-liquid two-phase state of the middle pressure of the 2nd expansion valve 26 is reduced pressure in freeze cycle by the 2nd expansion valve 26, become the cold-producing medium of the gas-liquid two-phase state of low pressure.

By the cold-producing medium of the gas-liquid two-phase state of the post-decompression low pressure of the 2nd expansion valve 26 by hydraulic fluid side stop valve 27 and liquid refrigerant communicating pipe 5 being sent to indoor heat converter 41.

The cold-producing medium being sent to the gas-liquid two-phase state of the low pressure of indoor heat converter 41 in indoor heat converter 41 with carry out heat exchange by indoor fan 42 as the room air that heating source provides and evaporate.Thus, room air is cooled, and is supplied to indoor afterwards, carries out indoor refrigeration thus.

In indoor heat converter 41, the gas refrigerant of the low pressure of evaporation is inhaled into compressor 21 again by gas refrigerant communicating pipe 6, gas side stop valve 28 and four-way switching valve 22.

(3) detailed construction of expansion valve and action

The basic structure > of < expansion valve

In aircondition 1, if use the expansion valve of fluting needle type as the 1st expansion valve 24 of the upstream side and downstream that are arranged at liquid reservoir 25 and the 2nd expansion valve 26, then cooling operation, heat running start time, likely can there is the liquid backflow that liquid refrigerant is back to compressor 21.On the other hand, as the 1st expansion valve 24 and the 2nd expansion valve 26, consider that use does not form groove at needle but is in the full cut-off type expansion valve of full-shut position because needle is resisted against valve seat.

Herein, first, basic structure and the action of the 1st expansion valve 24 and the 2nd expansion valve 26 be made up of full cut-off type expansion valve are described.

As shown in Figure 3, the 1st expansion valve 24 and the 2nd expansion valve 26 mainly have valve body 51, needle 61 and housing 71.In addition, herein, so that the 1st expansion valve 24 and the 2nd expansion valve 26 are arranged so that the moving direction of needle 61 is described towards the state of above-below direction.But this does not limit and is configured to the moving direction of needle 61 towards laterally waiting other direction.Herein, if the moving direction of the needle 61 when needle 61 is resisted against valve seat 55 (herein in downward direction) is needle direction of advance, if needle 61 away from the moving direction (being upward direction) of the needle 61 during valve seat 55 herein for needle is away from direction.

Herein, valve body 51 is (i.e. the moving direction of needle 61) component of about tubular of extending along the vertical direction, is formed with valve chamber 52.Valve chamber 52 has the larger top valve chamber 52a of the diameter bottom valve chamber 52b less with the diameter be positioned on the downside of the valve chamber 52a of top.The 2nd cold-producing medium mouth 54 towards the 1st cold-producing medium mouth 53 of the side openings of valve chamber 52 (being top valve chamber 52a) and the lower opening towards valve chamber 52 (being bottom valve chamber 52b) is formed herein herein at valve body 51.In addition, valve body 51 is provided with valve seat 55.Specifically, valve seat 55 is arranged at valve body 51 in the mode separating top valve chamber 52a and bottom valve chamber 52b.Thus, top valve chamber 52a forms the space (be herein the space of upside) of needle away from side, direction of valve seat 55, and bottom valve chamber 52b forms the space (being the space of downside) of the needle direction of advance side of valve seat 55 herein.In addition, herein, in 2 cold-producing medium mouths 53,54, the 1st cold-producing medium mouth 53 is arranged at the needle of valve seat 55 away from side, direction, and the 2nd cold-producing medium mouth 54 is arranged at the needle direction of advance side of valve seat 55.Be formed in valve seat 55 with pore (orificehole) 55a of the mode opening that top valve chamber 52a and bottom valve chamber 52b are communicated with along the moving direction (herein for above-below direction) of needle 61.In addition, valve body 51 inner peripheral surface by the modes such as press-in fixedly have an appointment tubular internal thread formed component 56.The top that internal thread forms component 56 will be given prominence to upward than valve body 51, is formed with internal thread 56a at inner peripheral surface.Form the bottom of component 56 at internal thread fixedly to be had an appointment by modes such as press-ins the needle guiding piece 57 of tubular.

Herein, needle 61 is relative to valve seat 55 (i.e. the moving direction of needle) component of retreating along the vertical direction, the state of movement along the vertical direction can be inserted into the Inner week side of needle guiding piece 57.Needle 61 bears component 63 via spring 62 described later and spring and is connected with the valve shaft 64 be configured in above needle 61.Valve shaft 64 is for crossing over housing 71 and (i.e. the moving direction of needle) about bar-shaped component of extending along the vertical direction from valve body 51.The lower end of valve shaft 64 is (i.e. the moving direction of needle) mobile and rotatable state can be inserted into the Inner week side of needle guiding piece 57 along the vertical direction.External screw thread 64a that the internal thread 56a that forms component 56 with internal thread engages to be fixed with the about tubular be made up of permanent magnet via lining 65 rotor 81 in the upside of the external screw thread 64a of valve shaft 64 is formed at the outer peripheral face of the middle body of the above-below direction (i.e. the moving direction of needle) of valve shaft 64.

Herein, housing 71 is the component of the about tubular of upper end closed.Housing 71 is fixed on the upper end of valve body 51 via not shown fixing metal accessory etc.The sleeve 72 of the about tubular extended downward is provided with at the inner surface of housing 71 upper end.In the Inner week side of sleeve 72, the upper end of valve shaft 64 is can (i.e. the moving direction of needle) move and the insertion of rotatable state along the vertical direction.The outer peripheral face of rotor 81 is relative to the spaced apart minim gap of the inner peripheral surface of housing 71.At the outer circumferential side of housing 71, be provided with the stator 82 be made up of electromagnet in the position relative with rotor 81.

In such an embodiment, if be energized to stator 82, then stator 82 and rotor 81 play the effect as stepping motor, and rotor 81 rotates according to turn on angle (pulse value).If rotor 81 rotates, then the valve shaft 64 rotated integrally with rotor 81 also rotates.If valve shaft 64 rotates, then the external screw thread 64a of valve shaft 64 is meshed with the internal thread 56a that internal thread forms component 56, and therefore, valve shaft 64 is relative to valve body 51 screw-driven, thus valve shaft 64 (that is, the moving direction of needle) movement along the vertical direction.If valve shaft 64 along the vertical direction (that is, the moving direction of needle) is mobile, then the needle 61 be connected with valve shaft 64 also along the vertical direction (i.e. the moving direction of needle) is mobile.Thus, regulate the size in the gap between needle 61 and valve seat 55, can reduce pressure to cold-producing medium, and control the flow by the cold-producing medium of the 1st expansion valve 24, the 2nd expansion valve 26.Therefore, by valve shaft 64 relative to valve body 51 screw-driven, if thus needle 61 is resisted against valve seat 55, then the gap between needle 61 and valve seat 55 disappears, and the 1st expansion valve 24, the 2nd expansion valve 26 become full-shut position (with reference to Fig. 3).

< is for preventing the structure > of the fluid-tight of needle

But if use full cut-off type expansion valve as the 1st expansion valve 24 and the 2nd expansion valve 26 (can switch valve), then, when 2 expansion valves 24,26 become full-shut position, liquid reservoir 25 likely becomes fluid-tight state.Therefore, when use full cut-off type expansion valve as the 1st and the 2nd expansion valve 24,26, even if in order to 2 expansion valves 24,26 become full-shut position, also can prevent the fluid-tight of liquid reservoir 25 and prevent pipe without the need to arranging fluid-tight, when needing the pressure increase comprising the cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 exists in refrigerant loop 10, make the cold-producing medium of the part existence comprised in refrigerant loop 10 between 2 expansion valves 24,26 of liquid reservoir 25 can escape into the other parts of refrigerant loop 10.

Therefore, herein, first, 1st expansion valve 24 is arranged at refrigerant loop 10 with the 1st configuration status, under 1st configuration status, cold-producing medium from liquid reservoir 25 flows into from the needle direction of advance side (being the downside of valve seat 55) of valve seat 55 herein, by the gap between needle 61 and valve seat 55, flows out to the valve seat of valve seat 55 away from side, direction (being the upside of valve seat 55) (with reference to Fig. 2 and Fig. 3) herein.Specifically, as shown in Figures 2 and 3,1st cold-producing medium mouth 53 of the 1st expansion valve 24 is connected to the 1st liquid refrigerant pipe 35a will be connected between its with outdoor heat converter 23, the 2nd cold-producing medium mouth 54 of the 1st expansion valve 24 is connected to the 2nd liquid refrigerant pipe 35b will be connected between its with liquid reservoir 25.Thus, be arranged in the 1st expansion valve 24 of refrigerant loop 10 with the 1st configuration status, when full-shut position, the pressure P 2 of the cold-producing medium in the space of the needle direction of advance side of valve seat 55 if (herein for bottom valve chamber 52b), with pressure P 1 away from the cold-producing medium in the space (being top valve chamber 52a) of side, direction herein of the needle of valve seat 55 between produce pressure differential, namely against pressing off valve pressure differential Δ P (=P2-P1), then the Fu (power herein for above pushing away upward) pressed towards needle away from direction by needle 61 works (with reference to Fig. 4).Herein, following structure is set: utilize by this inverse power Fu pressing off valve pressure differential Δ P and pressed away from direction towards needle by needle 61, the 1st expansion valve 24 being arranged at refrigerant loop 10 with the 1st configuration status arranges spring 62, this spring 62 will be resisted against the needle 61 of valve seat 55 towards needle direction of advance (being below) effect herein when full-shut position, if press off by inverse needle 61 to be overcome spring 62 by valve pressure differential Δ P away from the power Fu that direction the presses directed force F d towards needle direction of advance towards needle, then remove the state (with reference to Fig. 4 and Fig. 5) that needle 61 is resisted against valve seat 55.Specifically, as shown in Fig. 3 ~ Fig. 5, in the lower end of valve shaft 64, spring is born component 63 to be connected in the mode of moving direction (herein for above-below direction) the one movement with needle 61, utilize spring 62 to be born by spring between component 63 with the above-below direction of needle 61 and be connected.Herein, as spring 62, use the coil spring that can stretch along the moving direction of needle 61.Thus, obtain following structure: by the movement of the above-below direction of valve shaft 64, the distance between the above-below direction of valve shaft 64 and needle 61 can elastic telescopic, and in this case, needle 61 moves along the vertical direction.As shown in Figure 4, when full-shut position, if the lower end of valve shaft 64 arrives the extreme lower position of movable range, then spring 62 shrinks from drift, and there is amount of contraction, in this case, valve shaft 61 becomes the state (following, this state to be called " against pressing off valve off position ") being resisted against valve seat 55.Thus, spring 62 produces and will be resisted against the power Fd of needle 61 towards the effect of needle direction of advance of valve seat 55, and needle 61 presses on valve seat 55 by the directed force F d of spring 62.So, when full-shut position, if by the inverse directed force F d towards needle direction of advance needle 61 being overcome spring 61 towards needle away from the power Fu that direction presses pressing off valve pressure differential Δ P and produce, then as shown in Figure 5, at valve shaft 64 not along under the state of valve shaft away from direction (being top) movement herein, spring 62 is shunk further than against pressing off valve off position, and, needle 61 lifts off a seat 55 towards needle away from direction (being top) herein, remove the state (this state being called below " against pressing off valve duty ") that needle 61 is resisted against valve seat 55.Now, the length of spring 62 is retracted to the inverse length L pressed off under valve duty from the inverse length L0 pressed off valve off position.Thus, when the pressure (being equivalent to pressure P 2) of the cold-producing medium that the part between 2 expansion valves 24,26 comprising liquid reservoir 25 in refrigerant loop 10 exists rises, can make to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 exists and escape into outdoor heat converter 23 side (arrow of the flowing of the cold-producing medium of reference table diagram 5).

And, herein, the directed force F d of the spring 62 during setting full-shut position, make the saturation pressure of the cold-producing medium corresponding to peak of the environment temperature arranged in the place of the 1st and the 2nd expansion valve 24,26 (being herein outdoor unit 2) i.e. most High saturation pressure Psm, with the inverse summation pressing off valve pressure differential Δ P, be withstand voltage below the pressure P rm of liquid reservoir 25.Specifically, as most High saturation pressure Psm, use the saturation pressure most high ambient temperature (such as about 50 DEG C) assumable in the place arranging the 1st and the 2nd expansion valve 24,26 (being outdoor unit 2) being herein converted into cold-producing medium and the value obtained.As withstand voltage pressure P rv, use the resistance to pressure pressure of the liquid reservoir 25 that resistance to pressure pressure is minimum in parts i.e. the 1st expansion valve 24 of the part formed between 2 expansion valves 24,26 comprising liquid reservoir 25 in refrigerant loop 10, liquid reservoir 25 and the 2nd expansion valve 26.Herein, the withstand voltage pressure P rm of liquid reservoir 25 is obtained by the design pressure of liquid reservoir 25 being multiplied by safety coefficient (such as, corresponding with pneumatic test pressure about 1.5 times).For spring 62, the mode that the directed force F d under valve off position is below power Fum is pressed off with inverse, setting spring constant and the inverse its length L0 (namely from the length that drift is shunk) pressed off under valve off position, pressure differential corresponding to this inverse directed force F d pressed off under valve off position is set to and inversely presses off valve pressure differential Δ P, the described power Fum power that needle 61 is pressed away from direction towards needle that to be hypothesis produce from the withstand voltage pressure P rm of liquid reservoir 25 pressure differential deducted after most High saturation pressure Psm acts on needle 61.In addition, herein, as mentioned above, owing to obtaining the withstand voltage pressure P rm of liquid reservoir 25 based on the design pressure of liquid reservoir 25, therefore, can suitably set inverse press off valve pressure differential Δ P, namely full-shut position time the directed force F d of spring.Thus, even if when supposing to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 exists and rising to the condition of the environment temperature of the most such high temperature of High saturation pressure Phm, before exceeding the withstand voltage pressure P rm of liquid reservoir 25, by the inverse directed force F d towards needle direction of advance that needle 61 can be overcome spring 62 towards needle away from the power Fu that direction presses pressing off valve pressure differential Δ P and produce, thus the 1st expansion valve 24 becomes against pressing off valve duty.Therefore, for the cold-producing medium that the part between 2 expansion valves 24,26 comprising liquid reservoir 25 in refrigerant loop 10 exists, before exceeding the withstand voltage pressure P rm of liquid reservoir 25, make it escape into outdoor heat converter 23 side, the fluid-tight of liquid reservoir 25 can be prevented.In addition, if escape into outdoor heat converter 23 side owing to making the cold-producing medium of the part existence comprised in refrigerant loop 10 between 2 expansion valves 24,26 of liquid reservoir 25, cause the pressure drop of the cold-producing medium of the part comprised in refrigerant loop 10 between 2 expansion valves 24,26 of liquid reservoir 25, then press off being diminished by the power Fu that needle 61 acts on towards needle away from direction of valve pressure differential Δ P generation by inverse, the 1st expansion valve 24 returns to again against pressing off valve off position.Thus, the 1st expansion valve 24 can be become the inverse situation pressing off valve duty and be limited in necessary bottom line.

Like this, in aircondition 1, in the refrigerant loop 10 by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (can switch valve), indoor heat converter 41 are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve 24 and the 2nd expansion valve 26, also can prevent the fluid-tight of liquid reservoir 25 and prevent pipe without the need to arranging fluid-tight.And, in aircondition 1, can consider that the withstand voltage pressure P rm of liquid reservoir 25 suitably prevents the fluid-tight of liquid reservoir 25.

< is for preventing the structure > of the fluid-tight of the part between hydraulic fluid side stop valve and the 2nd expansion valve

In addition, when using full cut-off type expansion valve as the 2nd expansion valve 26 (can switch valve), if due to hydraulic fluid side stop valve 27 (can switch valve), the 2nd expansion valve 26 maloperation etc. and cause hydraulic fluid side stop valve 27 and the 2nd expansion valve 26 both sides all to become full-shut position, then likely can there is fluid-tight in the part in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26.In order to prevent the fluid-tight of the part between this hydraulic fluid side stop valve the 27 and the 2nd expansion valve 26, during the pressure increase of the cold-producing medium of the part in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26, need the cold-producing medium that the part in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26 is existed can escape into the other parts of refrigerant loop 10.

Therefore, herein, as mentioned above, 1st expansion valve 24 is arranged at refrigerant loop 10 with the 1st configuration status thus prevents the fluid-tight of liquid reservoir 25, and, first the 2nd expansion valve 26 is arranged at refrigerant loop 10 with the 2nd configuration status, under 2nd configuration status, cold-producing medium from liquid reservoir 25 flows into from the needle of valve seat 55 away from side, direction (being the upside of valve seat 55) herein, by the gap between needle 61 and valve seat 55, flow out to the valve seat direction of advance side (being the downside of valve seat 55) (with reference to Fig. 2 and Fig. 3) of valve seat 55 herein.Specifically, as shown in Figures 2 and 3,1st cold-producing medium mouth 53 of the 2nd expansion valve 26 is connected to the 3rd liquid refrigerant pipe 35c will be connected between its with liquid reservoir 25, the 2nd cold-producing medium mouth 54 of the 2nd expansion valve 26 is connected to the 4th liquid refrigerant pipe 35d will be connected between its with hydraulic fluid side stop valve 27.Thus, be arranged in the 2nd expansion valve 26 of refrigerant loop 10 with the 2nd configuration status, when full-shut position, the pressure P 2 of the cold-producing medium in the space of the needle direction of advance side of valve seat 55 if (herein for bottom valve chamber 52b), with pressure P 1 away from the cold-producing medium in the space (being top valve chamber 52a) of side, direction herein of the needle of valve seat 55 between produce pressure differential, namely against pressing off valve pressure differential Δ P (=P2-P1), then the Fu (power herein for above pushing away upward) pressed towards needle away from direction by needle 61 works (with reference to Fig. 4).Herein, utilize by this inverse power Fu pressing off valve pressure differential Δ P and needle 61 is pressed away from direction towards needle, the 2nd expansion valve 26 being arranged at refrigerant loop 10 with the 2nd configuration status arranges spring 62, this spring 62 will be resisted against the needle 61 of valve seat 55 towards needle direction of advance (being below) effect herein when full-shut position, if press off by inverse needle 61 to be overcome spring 62 by valve pressure differential Δ P away from the power Fu that direction the presses directed force F d towards needle direction of advance towards needle, then remove the state (with reference to Fig. 4 and Fig. 5) that needle 61 is resisted against valve seat 55.Specifically, as shown in Fig. 3 ~ Fig. 5, in the lower end of valve shaft 64, spring is born component 63 to be connected in the mode of moving direction (herein for above-below direction) the one movement with needle 61, utilize spring 62 to be born by spring between component 63 with the above-below direction of needle 61 and be connected.Herein, as spring 62, use the coil spring that can stretch along the moving direction of needle 61.Thus, obtain following structure: by the movement of the above-below direction of valve shaft 64, the distance between the above-below direction of valve shaft 64 and needle 61 can elastic telescopic, and in this case, needle 61 moves along the vertical direction.As shown in Figure 4, when full-shut position, if the lower end of valve shaft 64 arrives the extreme lower position of movable range, then spring 62 shrinks from drift, and there is amount of contraction, in this case, valve shaft 61 becomes the state (following, this state to be called " against pressing off valve off position ") being resisted against valve seat 55.Thus, spring 62 produces and will be resisted against the power Fd of needle 61 towards the effect of needle direction of advance of valve seat 55, and needle 61 presses on valve seat 55 by the directed force F d of spring 62.So, when full-shut position, if by the inverse directed force F d towards needle direction of advance needle 61 being overcome spring 61 towards needle away from the power Fu that direction presses pressing off valve pressure differential Δ P and produce, then as shown in Figure 5, at valve shaft 64 not along under the state of valve shaft away from direction (being top) movement herein, spring 62 is shunk further than against pressing off valve off position, and, needle 61 lifts off a seat 55 towards needle away from direction (being top) herein, remove the state (this state being called below " against pressing off valve duty ") that needle 61 is resisted against valve seat 55.Now, the length of spring 62 is retracted to the inverse length L pressed off under valve duty from the inverse length L0 pressed off valve off position.Thus, when the pressure (being equivalent to pressure P 2) of the cold-producing medium of the part in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26 rises, the cold-producing medium that the part in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26 can be made to exist escapes into liquid reservoir 25 side (arrow of the flowing of the cold-producing medium of reference table diagram 5).

And, herein, the directed force F d of the spring 62 during setting full-shut position, make the saturation pressure of the cold-producing medium corresponding to peak of the environment temperature arranged in the place of the 2nd expansion valve 26 (being outdoor unit 2) i.e. most High saturation pressure Psm herein, be form below the minimum of a value Phm from the resistance to pressure pressure of the parts of the part of the 2nd expansion valve 26 to hydraulic fluid side stop valve 27 in refrigerant loop 10 with the inverse summation pressing off valve pressure differential Δ P.Specifically, as most High saturation pressure Psm, use the saturation pressure most high ambient temperature (such as about 50 DEG C) assumable in the place arranging the 2nd expansion valve 26 (being outdoor unit 2) being herein converted into cold-producing medium and the value obtained.As the minimum of a value Phm of resistance to pressure pressure, use the resistance to pressure pressure forming parts minimum from resistance to pressure pressure the parts and hydraulic fluid side stop valve 27, the 4th liquid refrigerant pipe 35d and the 2nd expansion valve 26 of the part of the 2nd expansion valve 26 to hydraulic fluid side stop valve 27 in refrigerant loop 10.In addition, as the parts formed from the part of the 2nd expansion valve 26 to hydraulic fluid side stop valve 27 in refrigerant loop 10, when there is filter and pipe fitting etc., use the minimum of a value Phm comprising the resistance to pressure pressure of these parts.Herein, by obtaining resistance to pressure pressure by being multiplied by safety coefficient (such as, corresponding with pneumatic test pressure about 1.5 times) from the design pressure of the parts of the part of the 2nd expansion valve 26 to hydraulic fluid side stop valve 27 in formation refrigerant loop 10.For spring 62, the mode that the directed force F d under valve off position is below power Fum is pressed off with inverse, setting spring constant and the inverse its length L0 (namely from the length that drift is shunk) pressed off under valve off position, pressure differential corresponding to this inverse directed force F d pressed off under valve off position is set to and inversely presses off valve pressure differential Δ P, the described power Fum power that needle 61 is pressed away from direction towards needle that to be hypothesis produce from the minimum of a value Phm of the resistance to pressure pressure pressure differential deducted after most High saturation pressure Psm acts on needle 61.In addition, herein, as mentioned above, owing to obtaining resistance to pressure pressure based in formation refrigerant loop 10 from the design pressure of the parts of the part of the 2nd expansion valve 26 to hydraulic fluid side stop valve 27, therefore, can suitably set inverse press off valve pressure differential Δ P, namely full-shut position time the directed force F d of spring.Thus, even if when the cold-producing medium that the part supposed in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26 exists rises to the condition of the environment temperature of the most such high temperature of High saturation pressure Psm, form in refrigerant loop 10 from before the minimum of a value Phm of the resistance to pressure pressure of the parts of the part of the 2nd expansion valve 26 to hydraulic fluid side stop valve 27 exceeding, by the inverse directed force F d towards needle direction of advance that needle 61 can be overcome spring 62 towards needle away from the power Fu that direction presses pressing off valve pressure differential Δ P and produce, thus the 2nd expansion valve 26 becomes against pressing off valve duty.Therefore, for the cold-producing medium that hydraulic fluid side stop valve 27 in refrigerant loop 10 and the part between the 2nd expansion valve 26 exist, form in refrigerant loop 10 from before the resistance to pressure pressure of the parts of the part of the 2nd expansion valve 26 to hydraulic fluid side stop valve 27 exceeding, make it escape into liquid reservoir 25 side, the fluid-tight between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26 can be prevented.Herein, the cold-producing medium escaping into liquid reservoir 25 side likely causes the pressure increase of liquid reservoir 25, but due to the 1st expansion valve 24 is arranged with the 1st configuration status, therefore, before exceeding the withstand voltage pressure P rm of liquid reservoir 25, it is made to escape into outdoor heat converter 23 side.In addition, if the cold-producing medium existed due to the part made in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26 escapes into liquid reservoir 25 side, cause the pressure drop of the cold-producing medium of the part in refrigerant loop 10 between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26, then press off being diminished by the power Fu that needle 61 acts on towards needle away from direction of valve pressure differential Δ P generation by inverse, the 2nd expansion valve 26 returns to again against pressing off valve off position.Thus, the 2nd expansion valve 26 can be become the inverse situation pressing off valve duty and be limited in necessary bottom line.

Like this, in aircondition 1, in the refrigerant loop 10 by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (can switch valve), hydraulic fluid side stop valve 27 (can switch valve), indoor heat converter 41 are connected and form, the fluid-tight of liquid reservoir 25 can be prevented and prevent pipe without the need to arranging fluid-tight, and preventing the fluid-tight between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26.

(4) variation 1

In the aircondition 1 (with reference to Fig. 1 and Fig. 2) of above-mentioned embodiment, be provided with in the structure of the 1st expansion valve 24 of full cut-off type and the 2nd expansion valve 26 (can switch valve) at the upstream side of liquid reservoir 25 and downstream, in order to prevent the fluid-tight between the fluid-tight of liquid reservoir 25 and hydraulic fluid side stop valve 27 (can switch valve) and the 2nd expansion valve 26,1st expansion valve 24 is arranged with the 1st configuration status, and the 2nd expansion valve 26 is arranged with the 2nd configuration status.

But, if be only conceived to the fluid-tight of liquid reservoir 25, then at least one in the 1st expansion valve 24 and the 2nd expansion valve 26 is arranged at refrigerant loop 10 with the 1st configuration status.

Such as, as shown in Figure 6, the 1st expansion valve 24 can be arranged with the 2nd configuration status, and the 2nd expansion valve 26 is arranged with the 1st configuration status.When the 2nd expansion valve 26 is arranged with the 1st configuration status, during the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 comprising liquid reservoir 25 in refrigerant loop 10 exists, the cold-producing medium of the part existence comprised in refrigerant loop 10 between 2 expansion valves 24,26 of liquid reservoir 25 can be made to escape into indoor heat converter 41 side, prevent the fluid-tight of liquid reservoir 25.

In addition, as shown in Figure 7, the 1st expansion valve 24 and the 2nd expansion valve 26 can be arranged with the 1st configuration status.When the 1st and the 2nd expansion valve 24,26 is arranged with the 1st configuration status, during the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 comprising liquid reservoir 25 in refrigerant loop 10 exists, the cold-producing medium of the part existence comprised in refrigerant loop 10 between 2 expansion valves 24,26 of liquid reservoir 25 can be made to escape into outdoor heat converter 23 side and indoor heat converter 41 side, prevent the fluid-tight of liquid reservoir 25.

Like this, in this variation, in the refrigerant loop 10 by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (can switch valve), indoor heat converter 41 are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve 24 and the 2nd expansion valve 26, also can prevent the fluid-tight of liquid reservoir 25 and prevent pipe without the need to arranging fluid-tight.

(5) variation 2

In the aircondition 1 (with reference to Fig. 1) of above-mentioned embodiment and variation 1, as shown in Figure 8, the extraction valve 30a being used for extracting cold-producing medium out from the upper space of liquid reservoir 25 is set sometimes.

Such as, the exhaust tube 30 gas refrigerant of the middle pressure in the freeze cycle be stored in liquid reservoir 25 being guided to the suction line 31 of compressor 21 is set in refrigerant loop 10.Exhaust tube 30 is connected between being arranged to the top of liquid reservoir 25 to divide with the middle part of suction line 31.Extraction valve 30a is arranged at exhaust tube 30 together with capillary 30b and check-valves 30c.Extraction valve 30a be by the flowing ON/OFF of the cold-producing medium of exhaust tube 30 can switching control pilot, use magnetic valve herein.Capillary 30b is the mechanism the low pressure reduced pressure in freeze cycle by the gas refrigerant be stored in liquid reservoir 25, uses the capillary that diameter is thinner than exhaust tube 30 herein.Check-valves 30c be only allow cold-producing medium from liquid reservoir 25 side the valve system to the flowing of suction line 31 side, herein, use check-valves.

In such an embodiment, if become full-shut position together with extraction valve 30a and the 1st expansion valve 24 and the 2nd expansion valve 26 (can switch valve), then liquid reservoir 25 likely becomes fluid-tight state.

Therefore, in the structure with this extraction valve 30a, same with above-mentioned embodiment and variation 1, at least one in the 1st expansion valve 24 and the 2nd expansion valve 26 is arranged at refrigerant loop 10 (with reference to Fig. 2, Fig. 6 and Fig. 7) with the 1st configuration status.

Like this, in this variation, in the refrigerant loop 10 by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (can switch valve), indoor heat converter 41 and extraction valve 30a are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve 24 and the 2nd expansion valve 26, also can prevent the fluid-tight of liquid reservoir 25 and prevent pipe without the need to arranging fluid-tight.Herein, also by the 1st expansion valve 24 is arranged with the 1st configuration status, 2nd expansion valve 26 is arranged with the 2nd configuration status, thus the fluid-tight of liquid reservoir 25 can be prevented and prevent pipe without the need to arranging fluid-tight, and prevent the fluid-tight (reference Fig. 2) between hydraulic fluid side stop valve 27 (can switch valve) and the 2nd expansion valve 26 (can switch valve).

(6) variation 3

In the aircondition 1 (with reference to Fig. 8) of above-mentioned variation 2, as shown in Figure 9, as extraction valve 30a, same with the 1st expansion valve 24, the 2nd expansion valve 26 (can switch valve), consider use full cut-off type expansion valve.Herein, for extraction valve 30a, also use and have and the full cut-off type expansion valve of the 1st expansion valve 24, structure that the 2nd expansion valve 26 is identical (with reference to Fig. 3 ~ Fig. 5).

In such an embodiment, if be only conceived to the fluid-tight of liquid reservoir 25, then at least one in the 1st expansion valve 24, the 2nd expansion valve 26 and extraction valve 30a is arranged at refrigerant loop 10 with the 1st configuration status.

Such as, first, as shown in Figure 10, the 1st expansion valve 24 can be arranged with the 1st configuration status, and the 2nd expansion valve 26 and extraction valve 30a are arranged with the 2nd configuration status.Herein, the most High saturation pressure used in active force for setting spring 62, its for the environment temperature in the place (being herein outdoor unit 2) of liquid reservoir 25, the 1st expansion valve 24, the 2nd expansion valve 26 and extraction valve 30a is set peak corresponding to the saturation pressure of cold-producing medium.When the 1st expansion valve 24 is arranged with the 1st configuration status, when comprising the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists in refrigerant loop 10, can make to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists and escape into outdoor heat converter 23 side, prevent the fluid-tight of liquid reservoir 25.In the case, owing to being arranged with the 2nd configuration status by the 2nd expansion valve 26, therefore, the fluid-tight of liquid reservoir 25 can be prevented, and prevent the fluid-tight between hydraulic fluid side stop valve 27 (can switch valve) and the 2nd expansion valve 26.

In addition, as shown in figure 11, the 2nd expansion valve 26 can be arranged with the 1st configuration status, and the 2nd expansion valve 26 and extraction valve 30a are arranged with the 2nd configuration status.When the 2nd expansion valve 26 is arranged with the 1st configuration status, when comprising the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists in refrigerant loop 10, can make to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists and escape into indoor heat converter 41 side, prevent the fluid-tight of liquid reservoir 25.

In addition, as shown in figure 12, extraction valve 30a can be arranged with the 1st configuration status, and the 1st expansion valve 24 and the 2nd expansion valve 26 are arranged with the 2nd configuration status.When extraction valve 30a is arranged with the 1st configuration status, when comprising the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists in refrigerant loop 10, can make to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists and escape into compressor 21 side, prevent the fluid-tight of liquid reservoir 25.In the case, owing to being arranged with the 2nd configuration status by the 2nd expansion valve 26, therefore, the fluid-tight of liquid reservoir 25 can be prevented, and prevent the fluid-tight between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26.

In addition, as shown in figure 13, the 1st expansion valve 24 and extraction valve 30a can be arranged with the 1st configuration status, and the 2nd expansion valve 26 is arranged with the 2nd configuration status.When the 1st expansion valve 24 and extraction valve 30a are arranged with the 1st configuration status, when comprising the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists in refrigerant loop 10, can make to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists and escape into outdoor heat converter 23 side and compressor 21 side, prevent the fluid-tight of liquid reservoir 25.In the case, owing to being arranged with the 2nd configuration status by the 2nd expansion valve 26, therefore, the fluid-tight of liquid reservoir 25 can be prevented, and prevent the fluid-tight between hydraulic fluid side stop valve 27 and the 2nd expansion valve 26.

In addition, as shown in figure 14, the 2nd expansion valve 26 and extraction valve 30a can be arranged with the 1st configuration status, and the 1st expansion valve 24 is arranged with the 2nd configuration status.When the 2nd expansion valve 26 and extraction valve 30a are arranged with the 1st configuration status, when comprising the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists in refrigerant loop 10, can make to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists and escape into indoor heat converter 41 side and compressor 21 side, prevent the fluid-tight of liquid reservoir 25.

In addition, as shown in figure 15, the 1st expansion valve 24 and the 2nd expansion valve 26 can be arranged with the 1st configuration status, and extraction valve 30a is arranged with the 2nd configuration status.When the 1st expansion valve 24 and the 2nd expansion valve 26 are arranged with the 1st configuration status, when comprising the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists in refrigerant loop 10, can make to comprise in refrigerant loop 10 cold-producing medium that the part between 2 expansion valves 24,26 of liquid reservoir 25 and extraction valve 30a exists and escape into outdoor heat converter 23 side and indoor heat converter 41 side, prevent the fluid-tight of liquid reservoir 25.

In addition, as shown in figure 16, the 1st expansion valve 24, the 2nd expansion valve 26 and extraction valve 30a can be arranged with the 1st configuration status.When the 1st, the 2nd expansion valve 24,26 and extraction valve 30a are arranged with the 1st configuration status, during the pressure increase of the cold-producing medium that the part between 2 expansion valves 24,26 comprising liquid reservoir 25 in refrigerant loop 10 exists, the cold-producing medium of the part existence comprised in refrigerant loop 10 between 2 expansion valves 24,26 of liquid reservoir 25 can be made to escape into outdoor heat converter 23 side, indoor heat converter 41 side and compressor 21 side, prevent the fluid-tight of liquid reservoir 25.

Like this, in this variation, in the refrigerant loop 10 by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (can switch valve), indoor heat converter 41 and extraction valve 30a are connected and form, even if use full cut-off type expansion valve as the 1st expansion valve 24, the 2nd expansion valve 26 and extraction valve 30a, also can prevent the fluid-tight of liquid reservoir 25 and prevent pipe without the need to arranging fluid-tight.Herein, also by the 1st expansion valve 24 and/or extraction valve 30a are arranged with the 1st configuration status, 2nd expansion valve 26 is arranged with the 2nd configuration status, thus the fluid-tight of liquid reservoir 25 can be prevented and prevent pipe without the need to arranging fluid-tight, and prevent the fluid-tight between hydraulic fluid side stop valve 27 (can switch valve) and the 2nd expansion valve 26.

(7) variation 4

In the aircondition 1 (with reference to Fig. 1 ~ Figure 16) of above-mentioned embodiment and variation 1 ~ 3, be provided with the 1st expansion valve 24 that is made up of full cut-off type expansion valve and the 2nd expansion valve 26 (can switch valve) (also comprising the structure with extraction valve 30a) at the upstream side of liquid reservoir 25 and downstream, and between the 2nd expansion valve 26 and indoor heat converter 41, be provided with hydraulic fluid side stop valve 27 (can switch valve), premised on said structure, adopt the structure of the fluid-tight for preventing liquid reservoir 25 (by the 1st expansion valve 24, 2nd expansion valve 26 and/or extraction valve 30a are arranged with the 1st configuration status).

But, if be only conceived to the fluid-tight of liquid reservoir 25, also following situation can be supposed: even if under the state opened at the 2nd expansion valve 26, if due to the maloperation etc. of hydraulic fluid side stop valve 27 (can switch valve), (have extraction valve 30a and hydraulic fluid side stop valve 27 both sides all become full-shut position, then liquid reservoir 25 also becomes fluid-tight state to cause the 1st expansion valve 24.Specifically, consider the 1st expansion valve 24 be made up of full cut-off type expansion valve, with the 2nd configuration status, (when also having the extraction valve 30a be made up of full cut-off type expansion valve, also being arranged with the 2nd configuration status by extraction valve 30a) is set and situation about being arranged with the 1st configuration status by the 2nd expansion valve 26 be made up of full cut-off type expansion valve (with reference to Fig. 6 and Figure 11).

Like this, if also suppose maloperation etc. because of hydraulic fluid side stop valve 27 and cause liquid reservoir 25 to become the situation of fluid-tight state, then preferred the 1st expansion valve 24 be made up of full cut-off type expansion valve is arranged (when also having the extraction valve 30a be made up of full cut-off type expansion valve, the 1st expansion valve 24 and/or extraction valve 30a being arranged with the 1st configuration status) (with reference to Fig. 2, Fig. 7, Figure 10 and Figure 12 ~ Figure 16) with the 1st configuration status.

(8) variation 5

As above-mentioned variation 4, if also consider maloperation etc. because of hydraulic fluid side stop valve 27 (can switch valve) and cause liquid reservoir 25 to become the situation of fluid-tight state, then when by Figure 17 and as shown in Figure 18, premised on the structure that do not have the 2nd expansion valve 26 (can switch valve), also needing the fluid-tight supposing liquid reservoir 25, configuring the 1st expansion valve 24 (being extraction valve 30a when having the extraction valve 30a be made up of full cut-off type expansion valve) be made up of full cut-off type expansion valve.

Therefore, herein, the 1st expansion valve 24 be made up of full cut-off type expansion valve, the extraction valve 30a be made up of full cut-off type expansion valve are arranged with the 1st configuration status.Specifically, in the situation (with reference to Figure 17) of the extraction valve 30a be not made up of full cut-off type expansion valve, as shown in figure 19,1st expansion valve 24 is arranged with the 1st configuration status, in the situation (with reference to Figure 18) with the extraction valve 30a be made up of full cut-off type expansion valve, as shown in Figure 20 ~ Figure 22, the 1st expansion valve 24 and/or extraction valve 30a are arranged with the 1st configuration status

Like this, in this aircondition 1, at the refrigerant loop 10 by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, hydraulic fluid side stop valve 27, indoor heat converter 41 are connected and form (when having extraction valve 30a, also comprise extraction valve 30a) in, even if use full cut-off type expansion valve as the 1st expansion valve 24 (when having extraction valve 30a, use full cut-off type expansion valve as extraction valve 30a), also can prevent the fluid-tight of liquid reservoir 25 and prevent pipe without the need to arranging fluid-tight.

Industrial practicality

The present invention can be widely used in having by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, can switch valve, the indoor heat converter aircondition of refrigerant loop that connects and form.

Symbol description

1 aircondition

10 refrigerant loops

21 compressors

23 outdoor heat converters

41 indoor heat converters

24 the 1st expansion valves

26 the 2nd expansion valves (can switch valve)

27 hydraulic fluid side stop valves (can switch valve)

30a extraction valve

52a top valve chamber (needle of valve seat is away from the space of side, direction)

52b bottom valve chamber (space of the needle direction of advance side of valve seat)

55 valve seats

61 needles

62 springs

Prior art document

Patent document

Patent document 1: Japanese Patent Laid-Open 10-132393 publication

Claims

1. an aircondition (1), this aircondition have by compressor (21), outdoor heat converter (23), the 1st expansion valve (24), liquid reservoir (25), can switch valve (26,27), indoor heat converter (41) connect and form refrigerant loop (10), it is characterized in that

As described 1st expansion valve, use the full cut-off type expansion valve being in full-shut position because needle (61) is resisted against valve seat (55), and, described 1st expansion valve is arranged at described refrigerant loop with the 1st configuration status, under 1st configuration status, the moving direction of the described needle when setting described needle to be resisted against described valve seat is as needle direction of advance, and set described needle away from described needle during described valve seat moving direction as needle away from direction time, from the cold-producing medium of described liquid reservoir from described needle direction of advance one side inflow of described valve seat, by the gap between described needle and described valve seat, described needle to described valve seat flows out away from side, direction,

Described 1st expansion valve being arranged at described refrigerant loop with described 1st configuration status has will be resisted against the spring (62) of described needle towards the effect of described needle direction of advance of described valve seat when described full-shut position, described 1st expansion valve is configured to the pressure of the cold-producing medium in the space (52b) of the described needle direction of advance side of described valve seat, and the described needle of described valve seat away from the cold-producing medium in the space (52a) of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces described needle is pressed towards described needle away from direction make every effort to overcome the active force towards described needle direction of advance taking described spring, then remove the state that described needle is resisted against described valve seat.

2. aircondition (1) as claimed in claim 1, is characterized in that,

Described can switch valve be hydraulic fluid side stop valve (27).

3. aircondition (1) as claimed in claim 1, is characterized in that,

Described can switch valve be the 2nd expansion valve (26),

As described 2nd expansion valve, use the full cut-off type expansion valve being in full-shut position because needle (61) is resisted against valve seat (55),

In the case, at least one in described 1st expansion valve (24) and described 2nd expansion valve is arranged at described refrigerant loop (10) with the 1st configuration status, under 1st configuration status, the moving direction of the described needle when setting described needle to be resisted against described valve seat is as needle direction of advance, and set described needle away from described needle during described valve seat moving direction as needle away from direction time, from the cold-producing medium of described liquid reservoir from described needle direction of advance one side inflow of described valve seat, by the gap between described needle and described valve seat, described needle to described valve seat flows out away from side, direction,

Be arranged at described 1st expansion valve of described refrigerant loop and/or described 2nd expansion valve with described 1st configuration status to have and will be resisted against the spring (62) of described needle towards the effect of described needle direction of advance of described valve seat when described full-shut position, described 1st expansion valve and/or described 2nd expansion valve are configured to the pressure of the cold-producing medium in the space (52b) of the described needle direction of advance side of described valve seat, and the described needle of described valve seat away from the cold-producing medium in the space (52a) of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces described needle is pressed towards described needle away from direction make every effort to overcome the active force towards described needle direction of advance taking described spring, then remove the state that described needle is resisted against described valve seat.

4. aircondition (1) as claimed any one in claims 1 to 3, is characterized in that,

The active force of described spring when setting described full-shut position, make to arrange described liquid reservoir (25), described 1st expansion valve (24) and described can saturation pressure i.e. most High saturation pressure and the described inverse summation pressing off valve pressure differential of the cold-producing medium corresponding to peak of environment temperature in the place of switch valve (26,27) be below the resistance to pressure pressure of described liquid reservoir.

5. aircondition (1) as claimed in claim 1, is characterized in that,

Described refrigerant loop (10) also has the extraction valve (30a) for extracting cold-producing medium out from the upper space of described liquid reservoir (25),

As described extraction valve, use the full cut-off type expansion valve being in full-shut position because needle (61) is resisted against valve seat (55),

In the case, at least one in described 1st expansion valve (24) and described extraction valve is arranged at described refrigerant loop with the 1st configuration status, under 1st configuration status, the moving direction of the described needle when setting described needle to be resisted against described valve seat is as needle direction of advance, and set described needle away from described needle during described valve seat moving direction as needle away from direction time, from the cold-producing medium of described liquid reservoir from described needle direction of advance one side inflow of described valve seat, by the gap between described needle and described valve seat, described needle to described valve seat flows out away from side, direction,

Be arranged at described 1st expansion valve of described refrigerant loop and/or described extraction valve with described 1st configuration status to have and will be resisted against the spring (62) of described needle towards the effect of described needle direction of advance of described valve seat when described full-shut position, described 1st expansion valve and/or described extraction valve are configured to the pressure of the cold-producing medium in the space (52b) of the described needle direction of advance side of described valve seat, and the described needle of described valve seat away from the cold-producing medium in the space (52a) of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces described needle is pressed towards described needle away from direction make every effort to overcome the active force towards described needle direction of advance taking described spring, then remove the state that described needle is resisted against described valve seat.

6. aircondition (1) as claimed in claim 5, is characterized in that,

Described can switch valve be hydraulic fluid side stop valve (27).

7. aircondition (1) as claimed in claim 1, is characterized in that,

Described can switch valve be the 2nd expansion valve (26),

As described 2nd expansion valve and described extraction valve, use the full cut-off type expansion valve being in full-shut position because needle (61) is resisted against valve seat (55),

In the case, by described 1st expansion valve (24), at least one in described 2nd expansion valve and described extraction valve is arranged at described refrigerant loop with the 1st configuration status, under 1st configuration status, the moving direction of the described needle when setting described needle to be resisted against described valve seat is as needle direction of advance, and set described needle away from described needle during described valve seat moving direction as needle away from direction time, from the cold-producing medium of described liquid reservoir from described needle direction of advance one side inflow of described valve seat, by the gap between described needle and described valve seat, described needle to described valve seat flows out away from side, direction,

Described 1st expansion valve of described refrigerant loop is arranged at described 1st configuration status, described 2nd expansion valve and/or described extraction valve have will be resisted against the spring (62) of described needle towards the effect of described needle direction of advance of described valve seat when described full-shut position, described 1st expansion valve, described 2nd expansion valve and/or described extraction valve are configured to the pressure of the cold-producing medium in the space (52b) of the described needle direction of advance side of described valve seat, and the described needle of described valve seat away from the cold-producing medium in the space (52a) of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces described needle is pressed towards described needle away from direction make every effort to overcome the active force towards described needle direction of advance taking described spring, then remove the state that described needle is resisted against described valve seat.

8. the aircondition (1) according to any one of claim 5 to 7, is characterized in that,

The active force of described spring when setting described full-shut position, make to arrange described liquid reservoir (25), described 1st expansion valve (24), described can environment temperature in the place of switch valve (26,27) and described extraction valve (30a) the cold-producing medium corresponding to peak saturation pressure i.e. most High saturation pressure, be below the resistance to pressure pressure of described liquid reservoir with the described inverse summation pressing off valve pressure differential.

9. the aircondition (1) as described in claim 4 or 8, is characterized in that,

The described resistance to pressure pressure of described liquid reservoir (25) is the design pressure of described liquid reservoir is multiplied by the force value that safety coefficient obtains.

10. the aircondition (1) as described in claim 1 or 5, is characterized in that,

Described can the switch valve hydraulic fluid side stop valve (27) that is the 2nd expansion valve (26) and is connected between described 2nd expansion valve and described indoor heat converter (41),

As described 2nd expansion valve, use the full cut-off type expansion valve being in full-shut position because needle (61) is resisted against valve seat (55), and, described 2nd expansion valve is arranged at described refrigerant loop (10) with the 2nd configuration status, under 2nd configuration status, from the cold-producing medium of described liquid reservoir (25) from the described needle of described valve seat away from direction one side inflow, by the gap between described needle and described valve seat, described needle direction of advance side to described valve seat is flowed out

Described 2nd expansion valve being arranged at described refrigerant loop with described 2nd configuration status has will be resisted against the spring (62) of described needle towards the effect of described needle direction of advance of described valve seat when described full-shut position, be configured to the pressure of the cold-producing medium in the space (52b) of the described needle direction of advance side of described valve seat, and the described needle of described valve seat away from the cold-producing medium in the space (52a) of side, direction pressure between pressure differential press off valve pressure differential for inverse, if by this inverse press off that valve pressure differential produces described needle is pressed towards described needle away from direction make every effort to overcome the active force towards described needle direction of advance taking described spring, then remove the state that described needle is resisted against described valve seat.

11. airconditions (1) as claimed in claim 10, is characterized in that,

The active force of the described spring of described 2nd expansion valve when setting described full-shut position, make the saturation pressure of the cold-producing medium corresponding to peak of the environment temperature arranged in the place of described 2nd expansion valve (26) and described hydraulic fluid side stop valve (27) i.e. most High saturation pressure, with the described inverse summation pressing off valve pressure differential of described 2nd expansion valve be, to form in described refrigerant loop (10) below the minimum of a value of the resistance to pressure pressure of the parts of the part of described 2nd expansion valve to the stop valve of described hydraulic fluid side.

12. airconditions (1) as claimed in claim 11, is characterized in that,

Form in described refrigerant loop (10) and from the described resistance to pressure pressure of the parts of the part of described 2nd expansion valve (26) to described hydraulic fluid side stop valve (27) be, the force value obtained being multiplied by safety coefficient from the design pressure of the parts of the part of described 2nd expansion valve to the stop valve of described hydraulic fluid side in the described refrigerant loop of formation.