CN105308400B

CN105308400B - Air-conditioning device

Info

Publication number: CN105308400B
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: 2017-10-27
Anticipated expiration: 2034-06-02
Also published as: AU2014279254C1; EP3009773A4; JP2015017795A; AU2014279254B2; EP3009773B1; ES2673875T3; WO2014199855A1; CN105308400A; JP5862704B2; EP3009773A1; AU2014279254B9; AU2014279254A1

Abstract

In the air-conditioning device with the refrigerant loop that compressor, outdoor heat converter, the 1st expansion valve (24), liquid reservoir (25), switchable valve, indoor heat converter are connected and constituted, by the 1st expansion valve (24) of fully closed type so that obtain the refrigerant from liquid reservoir (25) is arranged at refrigerant loop (10) from the 1st configuration status of the needle direction of advance side inflow of valve seat (55).The 1st expansion valve (24) set with the 1st configuration status has the spring (62) for acting on needle (61) towards needle direction of advance.

Description

Air-conditioning device

Technical field

The present invention relates to air-conditioning device, more particularly to by compressor, outdoor heat converter, the 1st expansion valve, reservoir The air-conditioning device for the refrigerant loop that device, switchable valve, indoor heat converter are connected and constituted.

Background technology

In the past, as shown in patent document 1 (Japanese Patent Laid-Open 10-132393 publications), exist with liquid reservoir Upstream side and downstream be provided with expansion valve refrigerant loop air-conditioning device.Specifically, air-conditioning device, which will have, to press Contracting machine, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve (switchable valve), indoor heat converter are connected and constituted Refrigerant loop.

The content of the invention

Herein, when using fully closed type expansion valve as the expansion valve of the upstream side and downstream that are arranged at liquid reservoir, if 2 Individual expansion valve is in full-shut position, then liquid reservoir is possible to that fluid-tight state can be turned into.Herein, " fluid-tight " refers to refrigerant loop Regulation space filled up by liquid refrigerant, liquid refrigerant is in the state enclosed in regulation space, it is possible to can because of temperature Degree rises and causes to constitute the equipment rupture in the regulation space etc..I.e., herein, 2 that liquid reservoir is included in refrigerant loop are swollen Part between swollen valve is filled up by liquid refrigerant, and liquid refrigerant is in the state for enclosing the part, it is possible to can be because of temperature Degree rises and causes to constitute the equipment such as the liquid reservoir of part rupture etc..In addition, in the structure of patent document 1, being provided with to make Cryogen extracts from the upper space of liquid reservoir and is ejected into the playpipe of compressor, it is also considered that using fully closed type expansion valve as setting The extraction valve of the playpipe is placed in, but in the case, if 3 expansion valves are in full-shut position, liquid reservoir is also possible to Fluid-tight state can be turned into.In addition, the side in the upstream side and downstream of liquid reservoir sets fully closed type expansion valve the (such as the 1st Expansion valve), the opposing party in the upstream side and downstream of liquid reservoir set in the structure of hydraulic fluid side stop valve, if the 1st expansion Valve and hydraulic fluid side stop valve are in full-shut position, then liquid reservoir is also possible to that fluid-tight state can be turned into.

Cause refrigerant at any time can be empty from the top of liquid reservoir, it is necessary to set in addition to prevent the fluid-tight of this liquid reservoir Between the fluid-tight that escapes prevent pipe, if but set this fluid-tight to prevent pipe, the problem of cost increase and installation space can be produced, because This, can preferably prevent the fluid-tight of liquid reservoir without setting fluid-tight to prevent pipe.

The problem of the present invention is, with by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, switchable In the air-conditioning device for the refrigerant loop that valve, indoor heat converter are connected and constituted, fully closed type expansion valve can be used, and can prevent The fluid-tight of liquid reservoir is without setting fluid-tight to prevent pipe.

Air-conditioning device involved by 1st viewpoint be with by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, The air-conditioning device for the refrigerant loop that switchable valve, indoor heat converter are connected and constituted.Herein, as the 1st expansion valve, use Because needle is resisted against valve seat and is in the fully closed type expansion valve of full-shut position, also, the 1st expansion valve is set with the 1st configuration status It is placed under refrigerant loop, the 1st configuration status, advances in the moving direction for setting needle when needle is resisted against valve seat as needle The moving direction of direction and needle when setting needle away from valve seat as needle away from direction when, the refrigerant from liquid reservoir from The needle direction of advance side of valve seat is flowed into, by the gap between needle and valve seat, to the needle of valve seat away from direction side Outflow, has the valve that valve seat will be resisted against in full-shut position with the 1st expansion valve that the 1st configuration status is arranged at refrigerant loop The spring that pin is acted on towards needle direction of advance, the 1st expansion valve is configured in the space of needle direction of advance side of valve seat The space of the pressure of refrigerant and the needle of valve seat away from direction side in refrigerant pressure between pressure differential to be inverse Press off valve pressure differential, if by this it is inverse press off the generation of valve pressure differential needle towards needle is overcome into spring away from the power that direction is pressed Towards the active force of needle direction of advance, then the state that needle is resisted against valve seat is released.

In the case where using fully closed type expansion valve as the 1st expansion valve, though in order to the 1st expansion valve and switchable valve into For full-shut position, it can also prevent the fluid-tight of liquid reservoir without setting fluid-tight to prevent pipe, it is necessary to comprising storage in refrigerant loop When the pressure for the refrigerant that part between 1st expansion valve of liquid device and switchable valve is present rises so that in refrigerant loop In comprising liquid reservoir the 1st expansion valve and switchable valve between part exist refrigerant can escape into its of refrigerant loop Its part.

Therefore, herein, as described above, the 1st expansion valve is arranged at into refrigerant loop, the 1st configuration with the 1st configuration status Under state, the refrigerant from liquid reservoir is flowed into from the needle direction of advance side of valve seat, between needle and valve seat Gap, flows out to the needle of valve seat away from direction side.Thus, the 1st expansion of refrigerant loop is being arranged at the 1st configuration status In valve, in full-shut position, if the pressure of refrigerant in producing the space of the needle direction of advance side of valve seat, with valve seat Pressure differential between the pressure of refrigerant in space of the needle away from direction side is i.e. inverse to press off valve pressure differential, then by needle to Needle works away from the power that direction is pressed.Herein, following structure is set：Using by this inverse valve pressure differential is pressed off by needle The power pressed towards needle away from direction, spring is set on the 1st expansion valve for being arranged at refrigerant loop with the 1st configuration status, The spring acts on the needle for being resisted against valve seat towards needle direction of advance in full-shut position, if pressing off valve pressure differential by valve by inverse Pin can overcome the active force towards needle direction of advance of spring towards needle away from the power that direction is pressed, then release needle and be resisted against valve The state of seat.Thus, following structure can be obtained：In refrigerant loop the 1st expansion valve and switchable valve comprising liquid reservoir it Between part exist refrigerant pressure rise when, can make in refrigerant loop comprising liquid reservoir the 1st expansion valve with that can open The refrigerant for closing the presence of the part between valve escapes into outdoor heat converter side.

So, in the air-conditioning device, by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, switchable valve, In the refrigerant loop that indoor heat converter is connected and constituted, even if using fully closed type expansion valve as the 1st expansion valve, can also prevent Only the fluid-tight of liquid reservoir is without setting fluid-tight to prevent pipe.

Air-conditioning device involved by 2nd viewpoint is in the air-conditioning device involved by the 1st viewpoint, and switchable valve cuts for hydraulic fluid side Only valve.

I.e., herein, following refrigerant loop is constituted：A side in the upstream side and downstream of liquid reservoir sets fully closed type The 1st expansion valve, the opposing party in the upstream side and downstream of liquid reservoir sets hydraulic fluid side stop valve.Therefore, if the 1st expansion Valve and hydraulic fluid side stop valve turn into full-shut position, then liquid reservoir is likely to become fluid-tight state.

Therefore, herein, as described above, the 1st expansion valve of fully closed type is arranged at into refrigerant loop with the 1st configuration status, Under 1st configuration status, the refrigerant from liquid reservoir is flowed into from the needle direction of advance side of valve seat, passes through needle and valve seat Between gap, to valve seat needle away from direction side flow out.Thus, following structure can be obtained：Wrapped in refrigerant loop When the pressure for the refrigerant that part between the 1st expansion valve and hydraulic fluid side stop valve containing liquid reservoir is present rises, refrigeration can be made The refrigerant that part in agent loop between the 1st expansion valve and hydraulic fluid side stop valve comprising liquid reservoir is present escapes into outdoor heat Exchanger side.

So, in the air-conditioning device, end by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, hydraulic fluid side In the refrigerant loop that valve, indoor heat converter are connected and constituted, even if using fully closed type expansion valve as the 1st expansion valve, The fluid-tight of liquid reservoir can be prevented without setting fluid-tight to prevent pipe.

Air-conditioning device involved by 3rd viewpoint is in the air-conditioning device involved by the 1st viewpoint, and switchable valve is the 2nd expansion Valve, as the 2nd expansion valve, using because needle is resisted against valve seat and is in the fully closed type expansion valve of full-shut position.In the case, At least one in 1st expansion valve and the 2nd expansion valve is arranged at refrigerant loop, the 1st configuration status with the 1st configuration status Under, in valve of the moving direction for setting needle when needle is resisted against valve seat as needle direction of advance and when setting needle away from valve seat The moving direction of pin be needle away from direction when, the refrigerant from liquid reservoir is flowed into from the needle direction of advance side of valve seat, By needle and it is described between gap, to valve seat needle away from direction side flow out.Refrigeration is arranged at the 1st configuration status 1st expansion valve in agent loop and/or the 2nd expansion valve, which have, will be resisted against the needle of valve seat in full-shut position towards needle advance side To the spring of effect, the 1st expansion valve and/or the 2nd expansion valve are configured in the space of needle direction of advance side of valve seat The space of the pressure of refrigerant and the needle of valve seat away from direction side in refrigerant pressure between pressure differential to be inverse Press off valve pressure differential, if by this it is inverse press off the generation of valve pressure differential needle towards needle is overcome into spring away from the power that direction is pressed Towards the active force of needle direction of advance, then the state that needle is resisted against valve seat is released.

I.e., herein, following refrigerant loop is constituted：A side in the upstream side and downstream of liquid reservoir sets fully closed type The 1st expansion valve, the opposing party in the upstream side and downstream of liquid reservoir sets the 2nd expansion valve of fully closed type.So, make With fully closed type expansion valve as the 1st expansion valve and the 2nd expansion valve in the case of, even if in order to 2 expansion valves turn into full-shut position, Also the fluid-tight of liquid reservoir can be prevented without setting fluid-tight to prevent pipe, it is necessary to which include liquid reservoir in refrigerant loop 2 are swollen When the pressure for the refrigerant that part between swollen valve is present rises so that 2 expansions comprising liquid reservoir in refrigerant loop The refrigerant that part between valve is present can escape into the other parts of refrigerant loop.

Therefore, herein, as described above, at least one in the 1st expansion valve and the 2nd expansion valve is set with the 1st configuration status It is placed under refrigerant loop, the 1st configuration status, needle direction of advance one effluent of the refrigerant from liquid reservoir from valve seat Enter, by the gap between needle and valve seat, flowed out to the needle of valve seat away from direction side.Thus, with the 1st configuration status It is arranged in the 1st expansion valve of refrigerant loop and/or the 2nd expansion valve, in full-shut position, if the needle direction of advance of valve seat Between the pressure of refrigerant in the space of the pressure of refrigerant in the space of side and the needle of valve seat away from direction side Pressure differential is produced i.e. against valve pressure differential is pressed off, then needle is worked to needle away from the power that direction is pressed.Herein, set as follows Structure：, against the power that valve pressure differential presses needle towards needle away from direction is pressed off, set using by this with the 1st configuration status It is placed on the 1st expansion valve of refrigerant loop and/or the 2nd expansion valve and spring is set, the spring will be resisted against in full-shut position The needle of valve seat is acted on towards needle direction of advance, if pressing off the power energy that valve pressure differential presses needle towards needle away from direction by inverse Overcome the active force towards needle direction of advance of spring, then release the state that needle is resisted against valve seat.Thus, following knot can be obtained Structure：When the pressure for the refrigerant that part in refrigerant loop between 2 expansion valves comprising liquid reservoir is present rises, it can make The refrigerant that part in refrigerant loop between 2 expansion valves comprising liquid reservoir is present escapes into outdoor heat converter one Side, indoor heat converter side.

So, in the air-conditioning device, by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve, In the refrigerant loop that indoor heat converter is connected and constituted, even if swollen using fully closed type expansion valve as the 1st expansion valve and the 2nd Swollen valve, prevented also from liquid reservoir fluid-tight without set fluid-tight prevent pipe.

Air-conditioning device involved by 4th viewpoint is in the air-conditioning device involved by any one of the 1st~the 3rd viewpoint, setting The active force of spring during full-shut position so that the environment temperature in the place of liquid reservoir, the 1st expansion valve and switchable valve is set Peak corresponding to the saturation pressure of refrigerant be highest saturation pressure, be liquid reservoir with the inverse summation for pressing off valve pressure differential Resistance to pressure pressure below.

Herein, as described above, the active force of spring when setting full-shut position so that set the 1st expansion valve and switchable The saturation pressure of refrigerant corresponding to the peak of environment temperature in the place of valve is highest saturation pressure, presses off valve with inverse The summation of pressure differential is below the resistance to pressure pressure of liquid reservoir.Thus, even in it is assumed that including the 1st of liquid reservoir in refrigerant loop The refrigerant that part between expansion valve and switchable valve is present rises to the environment temperature of the such high temperature of highest saturation pressure In the case of condition, before the resistance to pressure pressure more than liquid reservoir, valve pressure differential generation needle is remote towards needle is pressed off by inverse The power pressed from direction overcomes the active force towards needle direction of advance of spring, so as to release the shape that needle is resisted against valve seat State.Therefore, the refrigeration existed for the part in refrigerant loop between the 1st expansion valve and switchable valve comprising liquid reservoir Agent, before the resistance to pressure pressure more than liquid reservoir, makes it escape into outdoor heat converter side, indoor heat converter side, can Prevent the fluid-tight of liquid reservoir.

So, in the air-conditioning device, it is contemplated that the resistance to pressure pressure of liquid reservoir suitably prevents the fluid-tight of liquid reservoir.

Air-conditioning device involved by 5th viewpoint is in the air-conditioning device involved by the 1st viewpoint, and refrigerant loop, which also has, to be used In the extraction valve for extracting refrigerant out from the upper space of liquid reservoir, as extraction valve, it is in using because needle is resisted against valve seat The fully closed type expansion valve of full-shut position.In the case, by least one in the 1st expansion valve and extraction valve with the 1st configuration shape State is arranged under refrigerant loop, the 1st configuration status, in the moving direction for setting needle when needle is resisted against valve seat as needle The moving direction of direction of advance and needle when setting needle away from valve seat as needle away from direction when, the refrigeration from liquid reservoir Agent is flowed into from the needle direction of advance side of valve seat, by needle and it is described between gap, to the needle of valve seat away from direction Flow out side.Have with the 1st expansion valve and/or extraction valve that the 1st configuration status is arranged at refrigerant loop in full-shut position The spring that the needle for being resisted against valve seat is acted on towards needle direction of advance, the 1st expansion valve and/or extraction valve are configured to valve seat Needle direction of advance side space in refrigerant pressure, with the system in space of the needle away from direction side of valve seat Pressure differential between the pressure of cryogen be it is inverse press off valve pressure differential, if by this it is inverse press off the generation of valve pressure differential by needle towards needle The power pressed away from direction overcomes the active force towards needle direction of advance of spring, then releases the state that needle is resisted against valve seat.

I.e., herein, following refrigerant loop is constituted：A side in the upstream side and downstream of liquid reservoir sets fully closed type The 1st expansion valve, the opposing party in the upstream side and downstream of liquid reservoir sets switchable valve, fully closed type set in liquid reservoir Extraction valve.So, in the case where using fully closed type expansion valve as the 1st expansion valve and extraction valve, even if for the 1st expansion Valve, switchable valve and extraction valve turn into full-shut position, can also prevent the fluid-tight of liquid reservoir without set fluid-tight prevent pipe, it is necessary to The refrigerant that part in refrigerant loop between the 1st expansion valve, switchable valve and extraction valve comprising liquid reservoir is present When pressure rises so that the part in refrigerant loop between the 1st expansion valve, switchable valve and extraction valve comprising liquid reservoir The refrigerant of presence can escape into the other parts of refrigerant loop.

Therefore, herein, as described above, at least one in the 1st expansion valve and extraction valve is arranged at the 1st configuration status Under refrigerant loop, the 1st configuration status, the refrigerant from liquid reservoir is flowed into from the needle direction of advance side of valve seat, is led to The gap crossed between needle and valve seat, flows out to the needle of valve seat away from direction side.Thus, set with the 1st configuration status In the 1st expansion valve and/or extraction valve of refrigerant loop, in full-shut position, if the needle direction of advance side of valve seat Pressure is produced between the pressure of refrigerant in the space of the pressure of refrigerant in space and the needle of valve seat away from direction side Power difference is i.e. inverse to press off valve pressure differential, then needle works to needle away from the power that direction is pressed.Herein, following structure is set： , against the power that valve pressure differential presses needle towards needle away from direction is pressed off, it is arranged at using by this with the 1st configuration status The needle for being resisted against valve seat is advanced towards needle during setting full-shut position on the 1st expansion valve and/or extraction valve of refrigerant loop The spring of direction effect, if by it is inverse press off valve pressure differential by needle towards needle away from the power that direction is pressed overcome spring towards needle The active force of direction of advance, then release the state that needle is resisted against valve seat.Thus, following structure can be obtained：In refrigerant loop In comprising liquid reservoir the 1st expansion valve, switchable valve and extraction valve between part exist refrigerant pressure rise when, can Make the refrigerant ease that the part in refrigerant loop between the 1st expansion valve, switchable valve and extraction valve comprising liquid reservoir is present Go out to outdoor heat converter side, indoor heat converter side, compressor side.

So, in the air-conditioning device, by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, switchable valve, In the refrigerant loop that indoor heat converter, extraction valve are connected and constituted, even if being used as the 1st expansion valve using fully closed type expansion valve And extraction valve, prevented also from liquid reservoir fluid-tight without set fluid-tight prevent pipe.

Air-conditioning device involved by 6th viewpoint is in the air-conditioning device involved by the 5th viewpoint, and switchable valve cuts for hydraulic fluid side Only valve.

Therefore, herein, as described above, the 1st expansion valve and/or extraction valve of fully closed type are arranged at the 1st configuration status Under refrigerant loop, the 1st configuration status, the refrigerant from liquid reservoir is flowed into from the needle direction of advance side of valve seat, is led to The gap crossed between needle and valve seat, flows out to the needle of valve seat away from direction side.Thus, following structure can be obtained：In system The refrigerant that part in refrigerant circuit between the 1st expansion valve, hydraulic fluid side stop valve and extraction valve comprising liquid reservoir is present When pressure rises, the portion between the 1st expansion valve, hydraulic fluid side stop valve and extraction valve comprising liquid reservoir in refrigerant loop can be made The refrigerant existed is divided to escape into outdoor heat converter side, compressor side.

So, in the air-conditioning device, end by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, hydraulic fluid side In the refrigerant loop that valve, indoor heat converter, extraction valve are connected and constituted, even if swollen as the 1st using fully closed type expansion valve Swollen valve and extraction valve, prevented also from liquid reservoir fluid-tight without set fluid-tight prevent pipe.

Air-conditioning device involved by 7th viewpoint is in the air-conditioning device involved by the 1st viewpoint, and switchable valve is the 2nd expansion Valve, refrigerant loop also has the extraction valve for being used for extracting refrigerant out from the upper space of liquid reservoir, as the 2nd expansion valve and takes out Air valve, using because needle is resisted against valve seat and is in the fully closed type expansion valve of full-shut position.In the case, by the 1st expansion valve, At least one in 2nd expansion valve and extraction valve is arranged under refrigerant loop, the 1st configuration status with the 1st configuration status, If the moving direction of needle when needle is resisted against valve seat is the shifting of needle direction of advance and needle when setting needle away from valve seat Dynamic direction be needle away from direction when, the refrigerant from liquid reservoir is flowed into from the needle direction of advance side of valve seat, passes through valve Pin and it is described between gap, to valve seat needle away from direction side flow out.Refrigerant loop is arranged at the 1st configuration status The 1st expansion valve, the 2nd expansion valve and/or extraction valve have and the needle of valve seat will be resisted against in full-shut position advances towards needle The spring of direction effect, the 1st expansion valve, the 2nd expansion valve and/or extraction valve are configured to the needle direction of advance side of valve seat Space in the space of the pressure of refrigerant and the needle of valve seat away from direction side in refrigerant pressure between pressure Power difference be it is inverse presses off valve pressure differential, if by this it is inverse press off the generation of valve pressure differential by needle towards needle away from making every effort to overcome that direction is pressed The active force towards needle direction of advance of spring is taken, then releases the state that needle is resisted against valve seat.

I.e., herein, following refrigerant loop is constituted：Set in the upstream side of liquid reservoir and downstream fully closed type the 1st and 2nd expansion valve, the extraction valve of fully closed type is set in liquid reservoir.So, fully closed type expansion valve is being used as the 1st expansion valve, the 2nd In the case of expansion valve and extraction valve, even if in order to which the 1st expansion valve, the 2nd expansion valve and extraction valve turn into full-shut position, can also prevent Only the fluid-tight of liquid reservoir without set fluid-tight prevent pipe, it is necessary in refrigerant loop the 1st expansion valve comprising liquid reservoir, the When the pressure for the refrigerant that part between 2 expansion valves and extraction valve is present rises so that reservoir is included in refrigerant loop The refrigerant that part between the 1st expansion valve, the 2nd expansion valve and the extraction valve of device is present can escape into the other of refrigerant loop Part.

Therefore, herein, as described above, by least one in the 1st expansion valve, the 2nd expansion valve and extraction valve with the 1st configuration State is arranged under refrigerant loop, the 1st configuration status, needle direction of advance one of the refrigerant from liquid reservoir from valve seat Side is flowed into, and by the gap between needle and valve seat, is flowed out to the needle of valve seat away from direction side.Thus, with the 1st configuration State is arranged in the 1st expansion valve, the 2nd expansion valve and/or the extraction valve of refrigerant loop, in full-shut position, if valve seat Refrigeration in space of the needle away from direction side of the pressure of refrigerant in the space of needle direction of advance side and valve seat Pressure differential is produced between the pressure of agent i.e. against valve pressure differential is pressed off, then needle is worked to needle away from the power that direction is pressed. Herein, following structure is set：Using by it is this it is inverse press off the power that valve pressure differential presses needle towards needle away from direction, with 1st configuration status is arranged on the 1st expansion valve of refrigerant loop, the 2nd expansion valve and/or extraction valve will when setting full-shut position The spring that the needle of valve seat is acted on towards needle direction of advance is resisted against, if by against valve pressure differential is pressed off that needle is remote square towards needle The active force towards needle direction of advance of spring is overcome to the power of pressing, then releases the state that needle is resisted against valve seat.Thus, may be used Obtain following structure：Part in refrigerant loop between the 1st expansion valve, the 2nd expansion valve and extraction valve comprising liquid reservoir When the pressure of the refrigerant of presence rises, the 1st expansion valve for including liquid reservoir in refrigerant loop, the 2nd expansion valve can be made and taken out The refrigerant that part between air valve is present escapes into outdoor heat converter side, indoor heat converter side, compressor side.

So, in the air-conditioning device, by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve, In the refrigerant loop that indoor heat converter, extraction valve are connected and constituted, even if being used as the 1st expansion using fully closed type expansion valve Valve, the 2nd expansion valve and extraction valve, prevented also from liquid reservoir fluid-tight without set fluid-tight prevent pipe.

Air-conditioning device involved by 8th viewpoint is in the air-conditioning device involved by any one of the 5th~the 7th viewpoint, setting The active force of spring during full-shut position so that in the place that liquid reservoir, the 1st expansion valve, switchable valve and extraction valve are set The saturation pressure of refrigerant corresponding to the peak of environment temperature is highest saturation pressure and the inverse summation for pressing off valve pressure differential Below the resistance to pressure pressure of liquid reservoir.

Herein, as described above, the active force of spring when setting full-shut position so that set the 1st expansion valve, switchable valve And the saturation pressure of the refrigerant corresponding to the peak of the environment temperature in the place of extraction valve be highest saturation pressure, with it is inverse The summation for pressing off valve pressure differential is below the resistance to pressure pressure of liquid reservoir.Thus, even in it is assumed that including reservoir in refrigerant loop It is high like that the refrigerant that part between the 1st expansion valve, switchable valve and the extraction valve of device is present rises to highest saturation pressure In the case of the condition of the environment temperature of temperature, before the resistance to pressure pressure more than liquid reservoir, press off what valve pressure differential was produced by inverse Needle is overcome to the active force towards needle direction of advance of spring towards needle away from the power that direction is pressed, supported so as to release needle It is against the state of valve seat.Therefore, in refrigerant loop comprising liquid reservoir the 1st expansion valve, switchable valve and extraction valve it Between part exist refrigerant, before the resistance to pressure pressure more than liquid reservoir, it is escaped into outdoor heat converter side, room Inside heat exchanger side, compressor side, can prevent the fluid-tight of liquid reservoir.

Air-conditioning device involved by 9th viewpoint in the air-conditioning device involved by the 4th or the 8th viewpoint, liquid reservoir it is pressure-resistant Pressure is pressure value obtained from the design pressure of liquid reservoir is multiplied by into safety coefficient.

Herein, the design pressure based on liquid reservoir obtains resistance to pressure pressure, therefore, can suitably set with the 1st configuration status The effect of the 1st expansion valve that sets, inverse spring when pressing off valve pressure differential, i.e. full-shut position of the 2nd expansion valve and/or extraction valve Power.

Air-conditioning device involved by 10th viewpoint is in the air-conditioning device involved by the 1st or the 5th viewpoint, and switchable valve is the 2 expansion valves and the hydraulic fluid side stop valve being connected between the 2nd expansion valve and indoor heat converter, as the 2nd expansion valve, are used Because needle is resisted against valve seat and is in the fully closed type expansion valve of full-shut position.Herein, the 2nd expansion valve is set with the 2nd configuration status It is placed under refrigerant loop, the 2nd configuration status, the refrigerant from liquid reservoir is from the needle of valve seat away from the effluent of direction one Enter, by the gap between needle and valve seat, flowed out to the needle direction of advance side of valve seat.It is arranged at the 2nd configuration status 2nd expansion valve of refrigerant loop has the bullet for acting on the needle for being resisted against valve seat towards needle direction of advance in full-shut position Spring, the 2nd expansion valve is configured to the pressure of the refrigerant in the space of the needle direction of advance side of valve seat, the valve with valve seat Pressure differential between the pressure of refrigerant in space of the pin away from direction side be it is inverse press off valve pressure differential, if inverse being pressed off by this The active force towards needle direction of advance that needle is overcome to spring towards needle away from the power that direction is pressed that valve pressure differential is produced, then Release the state that needle is resisted against valve seat.

In the case where using fully closed 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 to become full-shut position, then liquid in refrigerant loop Part between side stop valve and the 2nd expansion valve is possible to can occur fluid-tight.I.e., herein, hydraulic fluid side is ended in refrigerant loop Part between valve and the 2nd expansion valve is filled up by liquid refrigerant, and liquid refrigerant is in the state for enclosing the part, and having can Because of temperature rising the equipment such as the hydraulic fluid side stop valve, the 2nd expansion valve that constitute the part can be caused to rupture etc..In order to prevent this The fluid-tight of the part between hydraulic fluid side stop valve and the 2nd expansion valve is planted, hydraulic fluid side stop valve and the 2nd expansion in refrigerant loop , it is necessary to so that hydraulic fluid side stop valve and the 2nd expansion valve in refrigerant loop when the pressure of the refrigerant of part between valve rises Between part exist refrigerant can escape into the other parts of refrigerant loop.

Therefore, herein, as described above, by (being the 1st expansion valve in the case where also there is extraction valve by 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, also, through the 2nd expansion valve It is arranged at the 2nd configuration status under refrigerant loop, the 2nd configuration status, needle of the refrigerant from liquid reservoir from valve seat Flow into, by the gap between needle and valve seat, flowed out to the needle direction of advance side of valve seat away from direction side.Thus, In the 2nd expansion valve, in full-shut position, if the pressure of the refrigerant in the space of the needle direction of advance side of generation valve seat The i.e. inverse pressure cracking pressure of pressure differential between the pressure of refrigerant in space of the needle of power and valve seat away from direction side Difference, then work needle to needle away from the power that direction is pressed.Herein, following structure is set：Inverse pressed off using by this The power that valve pressure differential presses needle towards needle away from direction, the 2nd expansion of refrigerant loop is being arranged at the 2nd configuration status Spring is set on valve, and the spring acts on the needle for being resisted against valve seat towards needle direction of advance in full-shut position, if by inverse pressure Cracking pressure difference overcomes needle towards needle the active force towards needle direction of advance of spring away from the power that direction is pressed, then releases Needle is resisted against the state of valve seat.Thus, following structure can be obtained：Hydraulic fluid side stop valve and the 2nd expansion in refrigerant loop When the pressure of the refrigerant of part between valve rises, it can make in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve Part exist refrigerant escape into liquid reservoir side.

So, in the air-conditioning device, by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, the 2nd expansion valve, The refrigerant loop that hydraulic fluid side stop valve, indoor heat converter are connected and constituted (in the case where also there is extraction valve, is also included Extraction valve) in, the fluid-tight of liquid reservoir can be prevented without setting fluid-tight to prevent pipe, also, hydraulic fluid side stop valve and the 2nd can be prevented Fluid-tight between expansion valve.

Air-conditioning device involved by 11st viewpoint in the air-conditioning device involved by the 10th viewpoint, setting full-shut position when The active force of the spring of 2nd expansion valve so that the environment temperature in the place of the 2nd expansion valve of setting and hydraulic fluid side stop valve is most The saturation pressure of refrigerant corresponding to high level is highest saturation pressure, the inverse summation for pressing off valve pressure differential with the 2nd expansion valve For the minimum of the resistance to pressure pressure of the part of the part in composition refrigerant loop from the 2nd expansion valve untill hydraulic fluid side stop valve Value is following.

Herein, as described above, the active force of spring when setting full-shut position so that in the place for setting the 2nd expansion valve Environment temperature peak corresponding to the saturation pressure of refrigerant be highest saturation pressure, press off the total of valve pressure differential with inverse With to constitute the resistance to pressure pressure of the part of part from the 2nd expansion valve untill hydraulic fluid side stop valve in refrigerant loop most Below small value.Thus, even in it is assumed that the system that the part in refrigerant loop between hydraulic fluid side stop valve and the 2nd expansion valve is present In the case that cryogen rises to the condition of the environment temperature of the such high temperature of highest saturation pressure, in more than composition refrigerant loop Before the minimum value of the resistance to pressure pressure of the part of part of the 2nd expansion valve untill hydraulic fluid side stop valve, valve pressure is pressed off by inverse What power difference was produced can overcome needle towards needle the active force towards needle direction of advance of spring away from the power that direction is pressed, so that The state that needle is resisted against valve seat can be released.Therefore, between hydraulic fluid side stop valve in refrigerant loop and the 2nd expansion valve The refrigerant that part is present, more than constituting part from the 2nd expansion valve untill hydraulic fluid side stop valve in refrigerant loop Before the resistance to pressure pressure of part, it is escaped into liquid reservoir side, the liquid between hydraulic fluid side stop valve and the 2nd expansion valve can be prevented Envelope.Herein, the refrigerant for escaping into liquid reservoir side is possible to cause the pressure of liquid reservoir to rise, but due to the 1st being expanded In the case that valve (also there is extraction valve, be the 1st expansion valve and/or extraction valve) is set with the 1st configuration status, more than reservoir Before the resistance to pressure pressure of device, it (is outdoor heat in the case where also there is extraction valve that it can be made, which to escape into outdoor heat converter side, Exchanger side, compressor side).

So, in the air-conditioning device, the fluid-tight of liquid reservoir can be prevented without setting fluid-tight to prevent pipe, and, it is contemplated that The resistance to pressure pressure of the part of part in composition refrigerant loop from the 2nd expansion valve untill hydraulic fluid side stop valve, suitably to prevent The only fluid-tight between hydraulic fluid side stop valve and the 2nd expansion valve.

Air-conditioning device involved by 12nd viewpoint is constituted in refrigerant loop in the air-conditioning device involved by the 11st viewpoint Resistance to pressure pressure from the part of part of the 2nd expansion valve untill hydraulic fluid side stop valve is that will constitute in refrigerant loop from the 2nd The design pressure of the part of part of the expansion valve untill hydraulic fluid side stop valve is multiplied by pressure value obtained from safety coefficient.

Elsewhere, due to based on the portion for constituting the part in refrigerant loop from the 2nd expansion valve untill hydraulic fluid side stop valve The design pressure of part obtains resistance to pressure pressure, therefore, can suitably set the inverse of the 2nd expansion valve set with the 2nd configuration status and press off Valve pressure differential, i.e. full-shut position when spring active force.

Brief description of the drawings

Fig. 1 is the brief configuration figure of the air-conditioning device of one embodiment of the present invention.

Fig. 2 is to represent 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 for the expansion valve (not worked against valve is pressed off) when representing full-shut position.

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

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

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

Fig. 8 is the brief configuration figure of the air-conditioning device of variation 2.

Fig. 9 is the brief configuration figure of the air-conditioning device of variation 3.

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

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

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

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

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

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

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

Figure 17 is the brief configuration figure of the air-conditioning device of variation 5.

Figure 18 is the brief configuration figure of the air-conditioning device of variation 5.

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

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

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

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

Embodiment

Hereinafter, the embodiment and its variation of the air-conditioning device based on the brief description of the drawings present invention.In addition, the sky of the present invention Adjust the concrete structure of device to be not limited to following embodiments and its variation, can be carried out in the range of invention main points are not departed from Change.

(1) structure of air-conditioning device

Fig. 1 is the brief configuration figure of the air-conditioning device 1 of one embodiment of the present invention.

Air-conditioning device 1 is the freeze cycle by carrying out steam compression type, can carry out building etc. indoor refrigeration and The device heated.Air-conditioning device 1 is mainly constituted by the way that outdoor unit 2 and indoor unit 4 are connected.Herein, the He of outdoor unit 2 Indoor unit 4 is via connecting liquid refrigerant communicating pipe 5 and gas refrigerant communicating pipe 6.That is, the both vapor compression of air-conditioning device 1 The refrigerant loop 10 of formula is constituted by making outdoor unit 2 and indoor unit 4 be connected via cold-producing medium communicating pipe 5,6.In addition, As the refrigerant enclosed in the refrigerant loop 10, various refrigerants can be used, herein, as refrigerant, inclosure is used as one Plant the R32 of HFC class refrigerants.

Indoor unit 4 is arranged at interior, constitutes a part for refrigerant loop 10.Indoor unit 4 mainly has Indoor Thermal Exchanger 41.

Indoor heat converter 41 be play a part of evaporator as refrigerant in cooling operation and to room air Cooled down, play a part of the heat exchange heated as the radiator of refrigerant to room air in heating operation Device.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, which has, to be used to room air being drawn into indoor unit 4, make its indoors in heat exchanger 41 with Refrigerant is carried out after heat exchange, and the indoor fan 42 of interior is supplied to as supply air.Indoor fan 42 is used by indoor fan Motor 43 drives.

Indoor unit 4 has the indoor control unit 44 of the action in each portion of control composition indoor unit 4.Indoor is controlled Portion 44 can enter with microcomputer, memory set to carry out the control of indoor unit 4 etc. between remote control (not shown) The exchange of row control signal etc., or via transmission line 8a it is controlled exchanging for signal etc. between outdoor unit 2.

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

Compressor 21 is the equipment untill high pressure by the refrigerant compression of the low pressure in freeze cycle.Compressor 21 has By the closed structure of electric motor for compressor 21a rotation drivings, electric motor for compressor 21a is rotated using inverter control The compression key element (not shown) of formula or vortex isometric(al) formula.The suction side of compressor 21 is connected with suction line 31, and discharge side connects It is connected to discharge pipe 32.Suction line 31 is by the refrigeration of the 1st port 22a connections of the suction side of compressor 21 and four-way switching valve 22 Agent pipe.Suction line 31 is provided with storage tank 29.Discharge pipe 32 is by the 2nd end of the discharge side of compressor 21 and four-way switching valve 22 The refrigerant pipe of mouth 22b connections.Discharge pipe 32 is provided with check-valves 32a.

Four-way switching valve 22 is for the switching valve for the flow direction for switching the refrigerant in refrigerant loop 10.Four-way switching valve 22 carry out the switching to kind of refrigeration cycle state in cooling operation, under the kind of refrigeration cycle state, play outdoor heat converter 23 As the effect of the radiator of the refrigerant compressed in compressor 21, and indoor heat converter 41 is set to play as outdoor heat exchange The effect of the evaporator of the refrigerant radiated in device 23.That is, four-way switching valve 22 enters to exercise the 2nd port 22b in cooling operation The switching that the 1st port 22a is connected with the 4th port 22d is connected and makes with the 3rd port 22c.Thus, the discharge side of compressor 21 Be connected the gas side (being herein the 1st gas refrigerant pipe 33) of (being herein discharge pipe 32) and outdoor heat converter 23 (reference The solid line of Fig. 1 four-way switching valve 22).Moreover, the suction side (being herein suction line 31) of compressor 21 connects with gas refrigerant The side of siphunculus 6 (being herein the 2nd gas refrigerant pipe 34) is connected (solid line of the four-way switching valve 22 of reference picture 1).Four-way switches Valve 22 is carried out in heating operation to the switching for heating recurrent state, and this is heated under recurrent state, makes outdoor heat converter 23 The effect of the evaporator of the refrigerant radiated in as outdoor heat converter 41, and indoor heat converter 41 is played as pressure The effect of the radiator of the refrigerant compressed in contracting machine 21.That is, four-way switching valve 22 enters to exercise the 2nd port in heating operation 22b connects and made the switching that the 1st port 22a is connected with the 3rd port 22c with the 4th port 22d.Moreover, the discharge of compressor 21 Be connected (reference picture with the side of gas refrigerant communicating pipe 6 (being herein the 2nd gas refrigerant pipe 34) for side (being herein discharge pipe 32) The dotted line of 1 four-way switching valve 22).Moreover, the suction side (being herein suction line 31) of compressor 21 and outdoor heat converter 23 Gas side (being herein the 1st gas refrigerant pipe 33) be connected (dotted line of the four-way switching valve 22 of reference picture 1).1st gas Refrigerant pipe 33 is the refrigeration for being attached the 3rd port 22c of four-way switching valve 22 and outdoor heat converter 23 gas side Agent pipe.2nd gas refrigerant pipe 33 is to be connected the 4th port 22d of four-way switching valve 22 and the side of gas refrigerant communicating pipe 6 The refrigerant pipe connect.

Outdoor heat converter 23 is to be played in cooling operation as the dissipating as the refrigerant of cooling source using outdoor air The effect of hot device, play a part of in heating operation using outdoor air as the evaporator of the refrigerant of heating source heat exchange Device.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 for being attached the hydraulic fluid side of outdoor heat converter 23 and the side of liquid refrigerant communicating pipe 5 Pipe.

System of 1st expansion valve 24 in cooling operation for the high pressure in the freeze cycle that will be radiated in outdoor heat converter 23 Cryogen is depressurized to the valve untill the intermediate pressure in freeze cycle.1st expansion valve 24 is that will be store in liquid reservoir 25 in heating operation The refrigerant of intermediate pressure in the freeze cycle deposited is depressurized to the valve untill the low pressure in freeze cycle.1st expansion valve 24 is set Part in liquid refrigerant pipe 35 between outdoor heat converter 23 and liquid reservoir 25.Herein, will in liquid refrigerant pipe 35 The part that the expansion valve 24 of outdoor heat converter 23 and the 1st is attached is the 1st liquid refrigerant pipe 35a, liquid refrigerant pipe 35 The middle part for being attached the 1st expansion valve 24 and liquid reservoir 25 is the 2nd liquid refrigerant pipe 35b.In addition, herein, using electricity Dynamic expansion valve is used as the 1st expansion valve 24.In addition, the detailed construction on the 1st expansion valve 24 will be set forth later.

Liquid reservoir 25 is arranged between the 1st expansion valve 24 and the 2nd expansion valve 26.Liquid reservoir 25 is in cooling operation and system The container of the refrigerant of intermediate pressure in freeze cycle can be stored during heat run.

2nd expansion valve 26 (switchable valve) is the centre in freeze cycle that will be stored in liquid reservoir 25 in cooling operation The refrigerant of pressure is depressurized to the valve untill the low pressure in freeze cycle.2nd expansion valve 26 is to hand over Indoor Thermal in heating operation The refrigerant of high pressure in the freeze cycle radiated in parallel operation 41 is depressurized to the valve untill the intermediate pressure in freeze cycle.2nd is swollen Swollen valve 26 is arranged at the part in liquid refrigerant pipe 35 between liquid reservoir 25 and hydraulic fluid side stop valve 27.Herein, liquid refrigerating The part for being attached the expansion valve 26 of liquid reservoir 25 and the 2nd in agent pipe 35 is the 3rd liquid refrigerant pipe 35c, liquid refrigerant The part for being attached the 2nd expansion valve 26 and hydraulic fluid side stop valve 27 in pipe 35 is the 4th liquid refrigerant pipe 35d.In addition, this Place, the 2nd expansion valve 26 is used as using electric expansion valve.In addition, the detailed construction on the 2nd expansion valve 26 will be set forth later.

Hydraulic fluid side stop valve 27 (switchable valve) and gas side stop valve 28 are to be arranged on and outside equipment, pipe arrangement (tool Be liquid refrigerant communicating pipe 5 and gas refrigerant communicating pipe 6 for body) connector valve.Hydraulic fluid side stop valve 27 is set In liquid refrigerant pipe 35 (more specifically the 4th liquid refrigerant pipe 35d) end.Gas side stop valve 28 is arranged on The end of 2 gas refrigerant pipes 34.

Outdoor unit 2 have be used for outdoor air is drawn into outdoor unit 2, make its in outdoor heat converter 23 with Refrigerant carries out the outdoor fan 36 being discharged to the outside after heat exchange.Outdoor fan 36 is driven by outdoor fan motor 37.

Outdoor unit 2 has the outside control unit 38 of the action in each portion of control composition outdoor unit 2.Outside is controlled Portion 38, can be between indoor unit 4 via biography with microcomputer, memory set to carry out the control of outdoor unit 2 etc. Defeated line 8a is controlled the exchange of signal etc..

<Cold-producing medium communicating pipe>

Cold-producing medium communicating pipe 5,6 is the system constructed at the scene when air-conditioning device 1 is arranged on into the setting place such as building Refrigerant tube, has various length and caliber using the setting condition such as combination according to setting place, outdoor unit and indoor unit Cold-producing medium communicating pipe.

As described above, by the way that outdoor unit 2, indoor unit 4, cold-producing medium communicating pipe 5,6 are attached, constituting air-conditioning dress Put 1 refrigerant loop 10.Air-conditioning device 1 by four-way switching valve 22 by switching to kind of refrigeration cycle state, so as to enter to exercise system Cryogen is according to compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, the 2nd expansion valve 26 (switchable valve), liquid Side stop valve 27 (switchable valve), the sequential loop of indoor heat converter 41 ground cooling operation.In addition, air-conditioning device 1 passes through Four-way switching valve 22 is switched to and heats recurrent state, thus enter to exercise refrigerant according to compressor 21, indoor heat converter 41, Hydraulic fluid side stop valve 26 (switchable valve), the 2nd expansion valve 26 (switchable valve), liquid reservoir 25, the 1st expansion valve 24, outdoor heat are handed over The sequential loop of parallel operation 23 ground heating operation.In addition, herein, being configured to switching cooling operation and heating operation to be transported Turn, but it is also possible to without four-way switching valve, and be configured to be only capable of carrying out cooling operation or be only capable of carrying out heating operation.

Air-conditioning device 1 is carried out outdoor using the control unit 8 being made up of indoor control unit 44 and outside control unit 38 The control of each equipment of unit 2 and indoor unit 4.That is, using will connect between indoor control unit 44 and outside control unit 38 The transmission line 8a connect, constitutes the control for the overall operation control for carrying out the air-conditioning device 1 comprising above-mentioned cooling operation, heating operation etc. Portion 8 processed.

(2) elemental motion of air-conditioning device

Next, being illustrated using Fig. 1 to the elemental motion of air-conditioning device 1.In air-conditioning device 1, as elemental motion, Cooling operation and heating operation can be carried out.

In heating operation, four-way switching valve 22, which is switched to, heats recurrent state (state shown in Fig. 1 dotted line).

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

The gas refrigerant for the high pressure discharged from compressor 21 passes through four-way switching valve 22, gas side stop valve 28 and gas Cold-producing medium communicating pipe 6 is sent to indoor heat converter 41.

Be sent to the gas refrigerant of the high pressure of indoor heat converter 41 indoors in heat exchanger 41 with by indoor fan 42 room airs provided as cooling source carry out heat exchange and radiated, the liquid refrigerant as high pressure.Thus, room air It is heated, interior is supplied to afterwards, thus carries out indoor heat.

The liquid refrigerant of high pressure after being radiated indoors in heat exchanger 41 passes through liquid refrigerant communicating pipe 5 and liquid Side stop valve 27 is sent to the 2nd expansion valve 26.

The liquid refrigerant of high pressure of the 2nd expansion valve 26 is sent in the 2nd expansion valve 26 is depressurized in freeze cycle Between press untill, the refrigerant of the gas-liquid two-phase state as intermediate pressure.

By the 2nd expansion valve 26 depressurize after the refrigerant of gas-liquid two-phase state of intermediate pressure be temporarily stored in liquid reservoir 25, Afterwards, it is sent to the 1st expansion valve 24.

Be sent to the gas-liquid two-phase state of the intermediate pressure of the 1st expansion valve 24 refrigerant be depressurized to by the 1st expansion valve 24 it is cold Untill the low pressure frozen in circulation, the refrigerant of the gas-liquid two-phase state as low pressure.

By the 1st expansion valve 24 depressurize after the refrigerant of gas-liquid two-phase state of low pressure be sent to outdoor heat converter 23.

Be sent to the low pressure of outdoor heat converter 23 gas-liquid two-phase state refrigerant in outdoor heat converter 23 with The outdoor air provided by outdoor fan 36 as heating source carries out heat exchange and evaporated, the gas refrigerant as low pressure.

The refrigerant for the low pressure evaporated in outdoor heat converter 23 is again sucked into compression by four-way switching valve 22 Machine 21.

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

The gas refrigerant for the high pressure discharged from compressor 21 is sent to outdoor heat converter 23 by four-way switching valve 22.

The gas refrigerant of the high pressure of outdoor heat converter 23 is sent in outdoor heat converter 23 and by outdoor fan 36 outdoor airs provided as cooling source carry out heat exchange and radiated, the liquid refrigerant as high pressure.

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

The liquid refrigerant of high pressure of the 1st expansion valve 24 is sent in the 1st expansion valve 24 is depressurized in freeze cycle Between press untill, the refrigerant of the gas-liquid two-phase state as intermediate pressure.

By the 1st expansion valve 24 depressurize after the refrigerant of gas-liquid two-phase state of intermediate pressure be temporarily stored in liquid reservoir 25, Afterwards, it is sent to the 2nd expansion valve 26.

Be sent to the gas-liquid two-phase state of the intermediate pressure of the 2nd expansion valve 26 refrigerant be depressurized to by the 2nd expansion valve 26 it is cold Untill the low pressure frozen in circulation, the refrigerant of the gas-liquid two-phase state as low pressure.

By the 2nd expansion valve 26 depressurize after the refrigerant of gas-liquid two-phase state of low pressure pass through hydraulic fluid side stop valve 27 and liquid Cryogen communicating pipe 5 is sent to indoor heat converter 41.

Be sent to the refrigerant of the gas-liquid two-phase state of the low pressure of indoor heat converter 41 indoors in heat exchanger 41 with The room air provided by indoor fan 42 as heating source carries out heat exchange and evaporated.Thus, room air is cooled, afterwards Interior is supplied to, the refrigeration of interior is thus carried out.

The gas refrigerant for the low pressure evaporated indoors in heat exchanger 41 passes through gas refrigerant communicating pipe 6, gas side Stop valve 28 and four-way switching valve 22 are again sucked into compressor 21.

(3) detailed construction of expansion valve and action

In air-conditioning device 1, if the expansion valve using fluting needle type is used as the upstream side and downstream for being arranged at liquid reservoir 25 1st expansion valve 24 of side and the 2nd expansion valve 26, then when cooling operation, heating operation start, it is possible to can occur liquid refrigerating Agent is back to the liquid backflow of compressor 21.On the other hand, as the 1st expansion valve 24 and the 2nd expansion valve 26, it is considered to use and do not exist Needle formation groove but because needle is resisted against valve seat and is in the fully closed type expansion valve of full-shut position.

Herein, first, the basic structure for the 1st expansion valve 24 and the 2nd expansion valve 26 being made up of fully closed type expansion valve is illustrated And action.

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.Separately Outside, herein, the 1st expansion valve 24 and the 2nd expansion valve 26 are arranged so that the moving direction of needle 61 towards above-below direction Illustrated exemplified by state.But, this, which is not intended to limit, is configured to the moving direction of needle 61 towards other directions such as horizontal. Herein, if the moving direction (herein in downward direction) of the needle 61 when needle 61 is resisted against valve seat 55 is needle direction of advance, If the moving direction (being herein upward direction) of the needle 61 when needle 61 is away from valve seat 55 is needle away from direction.

Herein, valve body 51 is the component of the about tubular of (i.e. the moving direction of needle 61) along the vertical direction extension, is formed There is valve chamber 52.Valve chamber 52 has the top valve chamber 52a being relatively large in diameter and the less bottom of diameter on the downside of the valve chamber 52a of top Valve chamber 52b.Valve body 51 be formed with the 1st refrigerant mouthfuls 53 towards the side openings of valve chamber 52 (being herein top valve chamber 52a), And the 2nd refrigerant mouthful 54 of the lower opening towards valve chamber 52 (being herein bottom valve chamber 52b).In addition, being provided with valve body 51 Valve seat 55.Specifically, valve seat 55 is arranged at valve body 51 in the way of separating top valve chamber 52a and bottom valve chamber 52b.By This, top valve chamber 52a constitutes space (be herein the space of upside) of the needle away from direction side of valve seat 55, bottom valve chamber 52b constitutes the space (being herein the space of downside) of the needle direction of advance side of valve seat 55.In addition, herein, 2 refrigerants mouthful 53rd, in 54, the 1st refrigerant mouthful 53 is arranged at the needle of valve seat 55 away from direction side, and the 2nd refrigerant mouthful 54 is arranged at valve seat 55 Needle direction of advance side.It is formed with valve seat 55 with the moving along needle 61 by top valve chamber 52a and bottom valve chamber 52b Pore (orifice hole) 55a of the mode opening of direction (being herein above-below direction) connection.In addition, in valve body 51 Side face is fixed with the female thread of about tubular into component 56 by the mode such as being pressed into.Female thread is into the top of component 56 than valve master Body 51 will be protruded upward, and internal thread 56a is formed with inner peripheral surface.Pass through the side such as press-in in the bottom of internal thread formation component 56 Formula is fixed with the Valve pin guide 57 of about tubular.

Herein, needle 61 is relative to the component of (i.e. the moving direction of the needle) advance and retreat along the vertical direction of valve seat 55, with can The state moved along the vertical direction is inserted into the Inner the week side of boss of Valve pin guide 57.Needle 61 is held via spring 62 described later and spring It is connected by component 63 with the valve shaft 64 configured in the top of needle 61.Valve shaft 64 be from valve body 51 across housing 71 and vertically The about bar-shaped component of direction (i.e. the moving direction of needle) extension.The lower end of valve shaft 64 is with can (i.e. needle along the vertical direction Moving direction) mobile and rotatable state is inserted into the Inner the week side of boss of Valve pin guide 57.Valve shaft 64 above-below direction (i.e. The moving direction of needle) middle body outer peripheral face be formed with female thread into the internal thread 56a of component 56 engage it is outer Screw thread 64a is fixed with the rotor 81 for the about tubular being made up of permanent magnet via bushing 65 in the external screw thread 64a of valve shaft 64 upside.

Herein, housing 71 is the component of the about tubular of upper end closed.Housing 71 is via fixed metal fittings (not shown) etc. It is fixed on the upper end of valve body 51.Inner surface setting in the upper end of housing 71 has the sleeve 72 of the about tubular extended downward. The Inner the week side of boss of sleeve 72, the upper end of valve shaft 64 is with can (i.e. the moving direction of needle) mobile along the vertical direction and rotatable shape State is inserted.Being spaced apart minim gap of inner peripheral surface of the outer peripheral face of rotor 81 and housing 71 and it is relative.In the outer circumferential side of housing 71, The stator 82 being made up of electromagnet is provided with the position relative with rotor 81.

In this configuration, if being powered to stator 82, stator 82 and rotor 81 are played as stepping motor Effect, rotor 81 is rotated according to turn on angle (pulse value).If rotor 81 rotates, the valve shaft 64 rotated integrally with rotor 81 Also rotate.If valve shaft 64 rotates, the external screw thread 64a of valve shaft 64 is meshed with female thread into the internal thread 56a of component 56, because This, valve shaft 64 is relative to the screw-driven of valve body 51, so that (that is, the moving direction of needle) is mobile along the vertical direction for valve shaft 64. If (that is, the moving direction of needle) is mobile along the vertical direction for valve shaft 64, then the needle 61 being connected with valve shaft 64 is also along the vertical direction (i.e. the moving direction of needle) is mobile.Thus, the size in the gap between regulation needle 61 and valve seat 55, can be carried out to refrigerant Decompression, and control to pass through the 1st expansion valve 24, the flow of the refrigerant of the 2nd expansion valve 26.Therefore, by valve shaft 64 relative to valve The screw-driven of main body 51, if so that needle 61 is resisted against valve seat 55, the gap between needle 61 and valve seat 55 disappears, and the 1st is swollen Swollen valve 24, the 2nd expansion valve 26 become full-shut position (reference picture 3).

If however, using fully closed type expansion valve as the 1st expansion valve 24 and the 2nd expansion valve 26 (switchable valve), at 2 When expansion valve 24,26 turns into full-shut position, liquid reservoir 25 is likely to become fluid-tight state.Therefore, fully closed type expansion valve is being used In the case of as the 1st and the 2nd expansion valve 24,26, even if in order to which 2 expansion valves 24,26 turn into full-shut position, can also prevent storage The fluid-tight of liquid device 25 is without setting fluid-tight to prevent pipe, it is necessary to include 2 expansion valves of liquid reservoir 25 in refrigerant loop 10 24th, when the pressure for the refrigerant that the part between 26 is present rises so that 2 of liquid reservoir 25 are included in refrigerant loop 10 The refrigerant that part between expansion valve 24,26 is present can escape into the other parts of refrigerant loop 10.

Therefore, herein, first, the 1st expansion valve 24 is arranged at refrigerant loop 10, the 1st configuration with the 1st configuration status Under state, the refrigerant from liquid reservoir 25 flows from the needle direction of advance side (being herein the downside of valve seat 55) of valve seat 55 Enter, by the gap between needle 61 and valve seat 55, it (is herein valve seat 55 to flow out to the valve seat of valve seat 55 away from direction side Upside) (reference picture 2 and Fig. 3).Specifically, as shown in Figures 2 and 3, the 1st refrigerant mouthful 53 of the 1st expansion valve 24 is connected The 1st liquid refrigerant pipe 35a that it is connected between outdoor heat converter 23, to the 2nd refrigerant mouthful 54 of the 1st expansion valve 24 Connect the 2nd liquid refrigerant pipe 35b for being connected it between liquid reservoir 25.Thus, refrigerant is arranged at the 1st configuration status In 1st expansion valve 24 in loop 10, in full-shut position, if the space of the needle direction of advance side of valve seat 55 is (herein under Portion valve chamber 52b) in refrigerant pressure P2, with space of the needle away from direction side of valve seat 55 (be herein top valve chamber Produce pressure differential between the pressure P1 of refrigerant in 52a), i.e., it is inverse to press off valve pressure differential Δ P (=P2-P1), then by needle 61 The Fu (power above to push away upward herein) pressed towards needle away from direction works (reference picture 4).Herein, following knot is set Structure：, against the power Fu that valve pressure differential Δ P presses needle 61 towards needle away from direction is pressed off, configured using by this with the 1st State is arranged at setting spring 62 on the 1st expansion valve 24 of refrigerant loop 10, and the spring 62 will be resisted against in full-shut position The needle 61 of valve seat 55 is acted on towards needle direction of advance (being herein lower section), if pressing off valve pressure differential Δ P by the court of needle 61 by inverse Needle overcomes the directed force F d towards needle direction of advance of spring 62 away from the power Fu that direction is pressed, then releases needle 61 and be resisted against The state (reference picture 4 and Fig. 5) of valve seat 55.Specifically, as shown in Fig. 3~Fig. 5, spring is born into structure in the lower end of valve shaft 64 Part 63 is connected by the way of the moving direction of needle 61 (herein for above-below direction) integrally movement, is held spring using spring 62 Connected by between the above-below direction of component 63 and needle 61.Herein, as spring 62, using can along needle 61 moving direction stretch Coil spring.Thus, following structure is obtained：By the movement of the above-below direction of valve shaft 64, valve shaft 64 is with needle about 61 Distance between direction can elastic telescopic, in this case, needle 61 is moved along the vertical direction.As shown in figure 4, in full-shut position When, if the lower end of valve shaft 64 reaches the extreme lower position of movable range, spring 62 shrinks from drift, and with amount of contraction, In this case, valve shaft 61 turn into be resisted against valve seat 55 state (it is following, the state is referred to as to " the inverse valve that presses off does not work shape State ").Thus, spring 62 produces the power Fd for acting on the needle 61 for being resisted against valve seat 55 towards needle direction of advance, and needle 61 is by bullet The directed force F d of spring 62 presses on valve seat 55.Then, in full-shut position, if by it is inverse press off valve pressure differential Δ P generations by valve Pin 61 overcomes the directed force F d towards needle direction of advance of spring 61 towards needle away from the power Fu that direction is pressed, then as shown in figure 5, In the state of valve shaft 64 is not moved along valve shaft away from direction (being herein top), spring 62 is set to press off valve off position than inverse Further shrink, also, needle 61 lifts off a seat 55 towards needle away from direction (being herein top), releases needle 61 and is resisted against valve The state (being below referred to as the state " inverse to press off valve working condition ") of seat 55.Now, the length of spring 62 presses off valve not from inverse Length L0 under working condition is retracted to the inverse length L pressed off under valve working condition.Thus, storage is included in refrigerant loop 10 When the pressure (equivalent to pressure P2) for the refrigerant that part between 2 expansion valves 24,26 of liquid device 25 is present rises, it can cause The refrigerant that part in refrigerant loop 10 between 2 expansion valves 24,26 comprising liquid reservoir 25 is present escapes into outdoor The side of heat exchanger 23 (with reference to the arrow of the flowing for the refrigerant for representing Fig. 5).

Moreover, herein, the directed force F d of the spring 62 during setting full-shut position so that the 1st and the 2nd expansion valve 24 of setting, The saturation pressure of refrigerant corresponding to the peak of environment temperature in the place of 26 (being herein outdoor unit 2) is that highest is satisfied With pressure Psm, with being below the Prm of resistance to pressure pressure of liquid reservoir 25 against the summation for pressing off valve pressure differential Δ P.Specifically, as Highest saturation pressure Psm, use will can be assumed that in the place for setting the 1st and the 2nd expansion valve 24,26 (being herein outdoor unit 2) Highest environment temperature (such as 50 DEG C or so) be converted into value obtained from the saturation pressure of refrigerant.As the Prv of resistance to pressure pressure, The use of the part for constituting the part in refrigerant loop 10 between 2 expansion valves 24,26 comprising liquid reservoir 25 is the 1st expansion valve 24th, in the expansion valve 26 of liquid reservoir 25 and the 2nd the minimum liquid reservoir 25 of resistance to pressure pressure resistance to pressure pressure.Herein, by by liquid reservoir 25 design pressure is multiplied by safety coefficient (for example, 1.5 times corresponding with pneumatic test pressure or so) to obtain the resistance to of liquid reservoir 25 Pressure pressure Prm.For spring 62, in the way of the inverse directed force F d pressed off under valve off position is below power Fum, bullet is set Spring constant and the inverse its length L0 (length shunk from drift) pressed off under valve off position, by this against pressing off valve The pressure differential corresponding to directed force F d under off position is set to inverse and presses off valve pressure differential Δ P, the power Fum to assume from storage The general that the pressure differential that the Prm of resistance to pressure pressure of liquid device 25 is subtracted after highest saturation pressure Psm is produced in the case of acting on needle 61 The power that needle 61 is pressed towards needle away from direction.In addition, herein, as noted previously, as the design pressure based on liquid reservoir 25 is obtained To the Prm of resistance to pressure pressure of liquid reservoir 25, therefore, inverse spring when pressing off valve pressure differential Δ P, i.e. full-shut position can be suitably set Directed force F d.Thus, even in it is assumed that including the part between 2 expansion valves 24,26 of liquid reservoir 25 in refrigerant loop 10 In the case that the refrigerant of presence rises to the condition of the environment temperature of the such high temperature of highest saturation pressure Phm, more than reservoir Before the Prm of resistance to pressure pressure of device 25, by the inverse power for pressing needle 61 away from direction towards needle for pressing off valve pressure differential Δ P generations Fu can overcome the directed force F d towards needle direction of advance of spring 62, so that the 1st expansion valve 24, which turns into inverse, presses off valve working condition. Therefore, the refrigerant existed for the part between 2 expansion valves 24,26 comprising liquid reservoir 25 in refrigerant loop 10, Before the Prm of resistance to pressure pressure more than liquid reservoir 25, it is escaped into the side of outdoor heat converter 23, the liquid of liquid reservoir 25 can be prevented Envelope.If in addition, due to the system that there is the part in refrigerant loop 10 between 2 expansion valves 24,26 comprising liquid reservoir 25 Cryogen escapes into the side of outdoor heat converter 23, cause in refrigerant loop 10 comprising liquid reservoir 25 2 expansion valves 24,26 it Between the pressure of refrigerant of part decline, then by it is inverse press off valve pressure differential Δ P generations by needle 61 towards needle away from direction The power Fu of effect diminishes, and the 1st expansion valve 24, which is again restored to, inverse presses off valve off position.Thus, can by the 1st expansion valve 24 into Necessary bottom line is limited in for the inverse situation for pressing off valve working condition.

So, in air-conditioning device 1, by by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25th, in the refrigerant loop 10 that the 2nd expansion valve 26 (switchable valve), indoor heat converter 41 are connected and constituted, even if using complete Closed form expansion valve is as the 1st expansion valve 24 and the 2nd expansion valve 26, and the fluid-tight prevented also from liquid reservoir 25 is prevented without setting fluid-tight Only manage.Moreover, in air-conditioning device 1, it is contemplated that the Prm of resistance to pressure pressure of liquid reservoir 25 suitably prevents the fluid-tight of liquid reservoir 25.

In addition, in the case where using fully closed type expansion valve as the 2nd expansion valve 26 (switchable valve), if due to hydraulic fluid side Stop valve 27 (switchable valve), maloperation of the 2nd expansion valve 26 etc. and cause hydraulic fluid side stop valve 27 and the both sides of the 2nd expansion valve 26 Become full-shut position, then the part in refrigerant loop 10 between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd is possible to meeting Generation fluid-tight.In order to prevent the fluid-tight of the part between this expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd, in refrigerant loop , it is necessary to so that refrigerant during the pressure rising of the refrigerant of the part in 10 between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd The refrigerant that part in loop 10 between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd is present can escape into refrigerant loop 10 Other parts.

Therefore, herein, as described above, the 1st expansion valve 24 is arranged at into refrigerant loop 10 so as to anti-with the 1st configuration status The only fluid-tight of liquid reservoir 25, also, the 2nd expansion valve 26 is arranged at refrigerant loop 10, the 2nd with the 2nd configuration status first Under configuration status, the refrigerant from liquid reservoir 25 is from the needle of valve seat 55 away from direction side (being herein the upside of valve seat 55) Flow into, by the gap between needle 61 and valve seat 55, the valve seat direction of advance side for flowing out to valve seat 55 (is herein valve seat 55 Downside) (reference picture 2 and Fig. 3).Specifically, as shown in Figures 2 and 3, the 1st refrigerant mouthful 53 of the 2nd expansion valve 26 is connected The 3rd liquid refrigerant pipe 35c for being connected it between liquid reservoir 25 is met, the 2nd refrigerant mouthful 54 of the 2nd expansion valve 26 is connected The 4th liquid refrigerant pipe 35d that it is connected between hydraulic fluid side stop valve 27.Thus, refrigeration is arranged at the 2nd configuration status In 2nd expansion valve 26 in agent loop 10, in full-shut position, if the needle direction of advance side of valve seat 55 space (herein for Bottom valve chamber 52b) in refrigerant pressure P2, with space of the needle away from direction side of valve seat 55 (be herein upper valve Room 52a) in refrigerant pressure P1 between produce pressure differential, i.e., it is inverse to press off valve pressure differential Δ P (=P2-P1), then by needle 61 Fu pressed towards needle away from direction (power above to push away upward herein) work (reference picture 4).Herein, using passing through this Plant against the power Fu that valve pressure differential Δ P presses needle 61 towards needle away from direction is pressed off, refrigeration is being arranged at the 2nd configuration status Spring 62 is set on the 2nd expansion valve 26 in agent loop 10, and the spring 62 will be resisted against the needle 61 of valve seat 55 in full-shut position Towards needle direction of advance (being herein lower section) effect, if by it is inverse press off valve pressure differential Δ P by needle 61 towards needle away from direction by The power Fu of pressure can overcome the directed force F d towards needle direction of advance of spring 62, then release the state that needle 61 is resisted against valve seat 55 (reference picture 4 and Fig. 5).Specifically, as shown in Fig. 3~Fig. 5, the lower end of valve shaft 64 by spring bear component 63 with needle The mode of 61 moving direction (being herein above-below direction) one movement is connected, and spring is born into component 63 and valve using spring 62 Connected between the above-below direction of pin 61.Herein, as spring 62, the coil spring that can be stretched along the moving direction of needle 61 is used. Thus, following structure is obtained：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, in this case, needle 61 is moved along the vertical direction.As shown in figure 4, in full-shut position, if valve shaft 64 Lower end reaches the extreme lower position of movable range, then spring 62 shrinks from drift, and with amount of contraction, in this case, valve Axle 61 turns into the state (following, the state is referred to as " inverse to press off valve off position ") for being resisted against valve seat 55.Thus, spring 62 The power Fd for acting on the needle 61 for being resisted against valve seat 55 towards needle direction of advance is produced, needle 61 is pressed by the directed force F d of spring 62 It is pressed on valve seat 55.Then, in full-shut position, if pressing off valve pressure differential Δ P generations needle 61 is remote square towards needle by inverse The directed force F d towards needle direction of advance of spring 61 is overcome to the power Fu of pressing, then as shown in figure 5, in valve shaft 64 not along valve In the state of axle is away from direction (being herein top) movement, make spring 62 than valve off position is further to be shunk against pressing off, and And, needle 61 lifts off a seat 55 towards needle away from direction (being herein top), release needle 61 be resisted against valve seat 55 state (with It is lower to be referred to as the state " inverse to press off valve working condition ").Now, the length of spring 62 is from the inverse length pressed off under valve off position Degree L0 is retracted to the inverse length L pressed off under valve working condition.Thus, hydraulic fluid side stop valve 27 and the 2nd in refrigerant loop 10 When the pressure (equivalent to pressure P2) of the refrigerant of part between expansion valve 26 rises, the liquid in refrigerant loop 10 can be caused The refrigerant that part between the expansion valve 26 of side stop valve 27 and the 2nd is present escapes into the side of liquid reservoir 25 (with reference to expression Fig. 5 Refrigerant flowing arrow).

Moreover, herein, the directed force F d of the spring 62 during setting full-shut position so that set the 2nd expansion valve 26 (herein for Outdoor unit 2) place in environment temperature peak corresponding to the saturation pressure of refrigerant be highest saturation pressure Psm, with the inverse summation for pressing off valve pressure differential Δ P it is to constitute in refrigerant loop 10 from the 2nd expansion valve 26 to hydraulic fluid side stop valve Below the minimum value Phm of the resistance to pressure pressure of the part of part untill 27.Specifically, as highest saturation pressure Psm, use Assumable highest environment temperature (such as 50 DEG C or so) in the place of 2nd expansion valve 26 (being herein outdoor unit 2) will be set It is converted into value obtained from the saturation pressure of refrigerant.As the minimum value Phm of resistance to pressure pressure, composition refrigerant loop 10 is used In the part of part from the 2nd expansion valve 26 untill hydraulic fluid side stop valve 27 be hydraulic fluid side stop valve 27, the 4th liquid refrigerant The resistance to pressure pressure of the minimum part of resistance to pressure pressure in pipe 35d and the 2nd expansion valve 26.In addition, as in composition refrigerant loop 10 Part from part of the 2nd expansion valve 26 untill hydraulic fluid side stop valve 27, in the case of there is filter and pipe fitting etc., Use the minimum value Phm for including the resistance to pressure pressure including these parts.Herein, by that will constitute in refrigerant loop 10 from the 2nd The design pressure of the part of part of the expansion valve 26 untill hydraulic fluid side stop valve 27 is multiplied by safety coefficient (for example, and pressure test Corresponding 1.5 times or so of pressure) obtain resistance to pressure pressure.For spring 62, with the inverse active force pressed off under valve off position Fd is below power Fum mode, and setting spring constant and the inverse its length L0 pressed off under valve off position are (i.e. from free length Spend the length shunk), the pressure differential corresponding to the inverse directed force F d pressed off under valve off position is set to inverse and presses off valve pressure Power difference Δ P, the power Fum subtracts the effect of the pressure differential after highest saturation pressure Psm for hypothesis from the minimum value Phm of resistance to pressure pressure The power for pressing needle 61 away from direction towards needle produced in the case of needle 61.In addition, herein, as noted previously, as Design pressure based on the part for constituting the part in refrigerant loop 10 from the 2nd expansion valve 26 untill hydraulic fluid side stop valve 27 Resistance to pressure pressure is obtained, therefore, the directed force F d of inverse spring when pressing off valve pressure differential Δ P, i.e. full-shut position can be suitably set.By This, even in it is assumed that the refrigerant that the part in refrigerant loop 10 between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd is present In the case of the condition for the environment temperature for rising to the such high temperature of highest saturation pressure Psm, more than composition refrigerant loop 10 In part from the 2nd expansion valve 26 untill hydraulic fluid side stop valve 27 part resistance to pressure pressure minimum value Phm before, by inverse Press off valve pressure differential Δ P generation by needle 61 towards needle away from the power Fu that direction press can overcome spring 62 towards needle advance The directed force F d in direction, so that the 2nd expansion valve 26, which turns into inverse, presses off valve working condition.Therefore, for liquid in refrigerant loop 10 The refrigerant that part between the expansion valve 26 of side stop valve 27 and the 2nd is present, from the 2nd in more than composition refrigerant loop 10 Before the resistance to pressure pressure of the part of part of the expansion valve 26 untill hydraulic fluid side stop valve 27, it is set to escape into liquid reservoir 25 1 Side, can prevent the fluid-tight between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd.Herein, the refrigeration of the side of liquid reservoir 25 is escaped into The pressure that agent is likely to result in liquid reservoir 25 rises, but due to the 1st expansion valve 24 being set with the 1st configuration status, therefore, super Before the Prm of resistance to pressure pressure for crossing liquid reservoir 25, it is set to escape into the side of outdoor heat converter 23.If in addition, due to making refrigerant The refrigerant that part in loop 10 between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd is present escapes into the side of liquid reservoir 25, The pressure of the refrigerant of the part in refrigerant loop 10 between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd is caused to decline, then Valve pressure differential Δ P generations needle 61 diminishes towards needle away from the power Fu that direction is acted on is pressed off by inverse, the 2nd expansion valve 26 is again Return to and inverse press off valve off position.Thus, the 2nd expansion valve 26 can be turned into the inverse situation for pressing off valve working condition to be limited in Necessary bottom line.

So, in air-conditioning device 1, by by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25th, the 2nd expansion valve 26 (switchable valve), hydraulic fluid side stop valve 27 (switchable valve), indoor heat converter 41 are connected and constituted In refrigerant loop 10, the fluid-tight of liquid reservoir 25 can be prevented without setting fluid-tight to prevent pipe, and prevent hydraulic fluid side stop valve 27 With the fluid-tight between the 2nd expansion valve 26.

(4) variation 1

In the air-conditioning device 1 (reference picture 1 and Fig. 2) of above-mentioned embodiment, set in the upstream side and downstream of liquid reservoir 25 In the structure for being equipped with the 1st expansion valve 24 of fully closed type and the 2nd expansion valve 26 (switchable valve), in order to prevent the liquid of liquid reservoir 25 The fluid-tight of envelope and hydraulic fluid side stop valve 27 (switchable valve) between the 2nd expansion valve 26, by the 1st expansion valve 24 with the 1st configuration State is set, and the 2nd expansion valve 26 is set with the 2nd configuration status.

If however, being only conceived to the fluid-tight of liquid reservoir 25, by least one in the 1st expansion valve 24 and the 2nd expansion valve 26 It is individual that refrigerant loop 10 is arranged at the 1st configuration status.

For example, as shown in fig. 6, the 1st expansion valve 24 can be set with the 2nd configuration status, and by the 2nd expansion valve 26 with the 1st Configuration status is set.In the case where the 2nd expansion valve 26 is set with the 1st configuration status, storage is included in refrigerant loop 10 When the pressure for the refrigerant that part between 2 expansion valves 24,26 of liquid device 25 is present rises, it can cause in refrigerant loop 10 In comprising liquid reservoir 25 2 expansion valves 24,26 between part exist refrigerant escape into the side of indoor heat converter 41, Prevent the fluid-tight of liquid reservoir 25.

In addition, as shown in fig. 7, the 1st expansion valve 24 and the 2nd expansion valve 26 can be set with the 1st configuration status.By the 1st And the 2nd expansion valve 24,26 set with the 1st configuration status in the case of, it is swollen comprising 2 of liquid reservoir 25 in refrigerant loop 10 When the pressure for the refrigerant that part between swollen valve 24,26 is present rises, it can to include liquid reservoir in refrigerant loop 10 The refrigerant that part between 25 2 expansion valves 24,26 is present escapes into the side of outdoor heat converter 23 and indoor heat exchange The side of device 41, prevents the fluid-tight of liquid reservoir 25.

So, in this variation, by by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, In the refrigerant loop 10 that 2nd expansion valve 26 (switchable valve), indoor heat converter 41 are connected and constituted, even if using fully closed type Expansion valve is as the 1st expansion valve 24 and the 2nd expansion valve 26, and the fluid-tight prevented also from liquid reservoir 25 is prevented without setting fluid-tight Pipe.

(5) variation 2

In the air-conditioning device 1 (reference picture 1) of above-mentioned embodiment and variation 1, used as shown in figure 8, setting sometimes In the extraction valve 30a for extracting refrigerant out from the upper space of liquid reservoir 25.

For example, setting the gas of the intermediate pressure in the freeze cycle that will be stored in liquid reservoir 25 in refrigerant loop 10 Refrigerant is guided to the exhaust tube 30 of the suction line 31 of compressor 21.Exhaust tube 30 is arranged to the top of liquid reservoir 25 and suction Connected between the middle part of pipe 31 point.Extraction valve 30a is arranged at exhaust tube 30 together with capillary 30b and check-valves 30c.Pumping Valve 30a is, by the switchable control valve of the flowing ON/OFF of the refrigerant of exhaust tube 30, herein, to use magnetic valve.Capillary 30b is the mechanism untill the gas refrigerant being stored in liquid reservoir 25 to be depressurized to low pressure in freeze cycle, herein, is used The diameter capillary thinner than exhaust tube 30.Check-valves 30c is only to allow refrigerant from the lateral suction line 31 1 of liquid reservoir 25 1 The valve system of the flowing of side, herein, uses check-valves.

In this configuration, if extraction valve 30a turns into together with the 1st expansion valve 24 and the 2nd expansion valve 26 (switchable valve) Full-shut position, then liquid reservoir 25 be likely to become fluid-tight state.

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

So, in this variation, by by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, 2nd expansion valve 26 (switchable valve), indoor heat converter 41 and extraction valve 30a connections and constitute refrigerant loop 10 in, i.e., Fully closed type expansion valve is used as the 1st expansion valve 24 and the 2nd expansion valve 26, prevented also from liquid reservoir 25 fluid-tight without setting Putting fluid-tight prevents pipe.Herein, set also by by the 1st expansion valve 24 with the 1st configuration status, by the 2nd expansion valve 26 with the 2nd configuration State is set, and so as to prevent the fluid-tight of liquid reservoir 25 from preventing pipe without setting fluid-tight, and prevents that hydraulic fluid side stop valve 27 (can Switch valve) fluid-tight (reference picture 2) between the 2nd expansion valve 26 (switchable valve).

(6) variation 3

In the air-conditioning device 1 (reference picture 8) of above-mentioned variation 2, as shown in figure 9, as extraction valve 30a, with the 1st expansion Valve 24, the 2nd expansion valve 26 (switchable valve) are same, it is considered to use fully closed type expansion valve.Herein, for extraction valve 30a, also use With the fully closed type expansion valve (3~Fig. 5 of reference picture) with the 1st expansion valve 24, the identical structure of the 2nd expansion valve 26.

In this configuration, if being only conceived to the fluid-tight of liquid reservoir 25, by the 1st expansion valve 24, the 2nd expansion valve 26 and take out At least one in air valve 30a is arranged at refrigerant loop 10 with the 1st configuration status.

For example, first, as shown in Figure 10, the 1st expansion valve 24 can be set with the 1st configuration status, and by the 2nd expansion valve 26 And extraction valve 30a is set with the 2nd configuration status.Herein, the highest saturation pressure used in the active force for setting spring 62, It is to set in liquid reservoir 25, the 1st expansion valve 24, the 2nd expansion valve 26 and extraction valve 30a place (being herein outdoor unit 2) Environment temperature peak corresponding to refrigerant saturation pressure.What the 1st expansion valve 24 was set with the 1st configuration status In the case of, the part in refrigerant loop 10 between 2 expansion valves 24,26 and extraction valve 30a comprising liquid reservoir 25 is present Refrigerant pressure rise when, can cause in refrigerant loop 10 comprising liquid reservoir 25 2 expansion valves 24,26 and be evacuated The refrigerant that part between valve 30a is present escapes into the side of outdoor heat converter 23, prevents the fluid-tight of liquid reservoir 25.In this feelings Under condition, due to the 2nd expansion valve 26 being set with the 2nd configuration status, it is therefore possible to prevent the fluid-tight of liquid reservoir 25, and prevent liquid Fluid-tight of the side stop valve 27 (switchable valve) between the 2nd expansion valve 26.

In addition, as shown in figure 11, the 2nd expansion valve 26 can be set with the 1st configuration status, and by the 2nd expansion valve 26 and takes out Air valve 30a is set with the 2nd configuration status.In the case where the 2nd expansion valve 26 is set with the 1st configuration status, returned in refrigerant The pressure for the refrigerant that part in road 10 between 2 expansion valves 24,26 and extraction valve 30a comprising liquid reservoir 25 is present rises When, the part in refrigerant loop 10 between 2 expansion valves 24,26 and extraction valve 30a comprising liquid reservoir 25 can be caused to deposit Refrigerant escape into the side of indoor heat converter 41, prevent the fluid-tight of liquid reservoir 25.

In addition, as shown in figure 12, extraction valve 30a can be set with the 1st configuration status, and the 1st expansion valve 24 and the 2nd is swollen Swollen valve 26 is set with the 2nd configuration status.In the case where extraction valve 30a is set with the 1st configuration status, in refrigerant loop 10 In comprising liquid reservoir 25 2 expansion valves 24,26 and extraction valve 30a between part exist refrigerant pressure rise when, It can cause what the part in refrigerant loop 10 between 2 expansion valves 24,26 and extraction valve 30a comprising liquid reservoir 25 was present Refrigerant escapes into the side of compressor 21, prevents the fluid-tight of liquid reservoir 25.In the case, due to by the 2nd expansion valve 26 with the 2nd Configuration status is set, it is therefore possible to prevent the fluid-tight of liquid reservoir 25, and is prevented between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd Fluid-tight.

In addition, as shown in figure 13, the 1st expansion valve 24 and extraction valve 30a can be set with the 1st configuration status, and it is swollen by the 2nd Swollen valve 26 is set with the 2nd configuration status.In the case where the 1st expansion valve 24 and extraction valve 30a are set with the 1st configuration status, The refrigerant that part in refrigerant loop 10 between 2 expansion valves 24,26 and extraction valve 30a comprising liquid reservoir 25 is present Pressure rise when, can cause in refrigerant loop 10 include liquid reservoir 25 2 expansion valves 24,26 and extraction valve 30a it Between part exist refrigerant escape into the side of outdoor heat converter 23 and the side of compressor 21, prevent the liquid of liquid reservoir 25 Envelope.In the case, due to the 2nd expansion valve 26 being set with the 2nd configuration status, it is therefore possible to prevent the fluid-tight of liquid reservoir 25, and Prevent the fluid-tight between the expansion valve 26 of hydraulic fluid side stop valve 27 and the 2nd.

In addition, as shown in figure 14, the 2nd expansion valve 26 and extraction valve 30a can be set with the 1st configuration status, and it is swollen by the 1st Swollen valve 24 is set with the 2nd configuration status.In the case where the 2nd expansion valve 26 and extraction valve 30a are set with the 1st configuration status, The refrigerant that part in refrigerant loop 10 between 2 expansion valves 24,26 and extraction valve 30a comprising liquid reservoir 25 is present Pressure rise when, can cause in refrigerant loop 10 include liquid reservoir 25 2 expansion valves 24,26 and extraction valve 30a it Between part exist refrigerant escape into the side of indoor heat converter 41 and the side of compressor 21, prevent the liquid of liquid reservoir 25 Envelope.

In addition, as shown in figure 15, the 1st expansion valve 24 and the 2nd expansion valve 26 can be set with the 1st configuration status, and will take out Air valve 30a is set with the 2nd configuration status.In the situation for setting the 1st expansion valve 24 and the 2nd expansion valve 26 with the 1st configuration status Under, the system that the part in refrigerant loop 10 between 2 expansion valves 24,26 and extraction valve 30a comprising liquid reservoir 25 is present When the pressure of cryogen rises, 2 expansion valves 24,26 and extraction valve that liquid reservoir 25 is included in refrigerant loop 10 can be caused The refrigerant that part between 30a is present escapes into the side of outdoor heat converter 23 and the side of indoor heat converter 41, prevents storage The fluid-tight of liquid device 25.

In addition, as shown in figure 16, the 1st expansion valve 24, the 2nd expansion valve 26 and extraction valve 30a can be set with the 1st configuration status Put.In the case where the 1st, the 2nd expansion valve 24,26 and extraction valve 30a are set with the 1st configuration status, in refrigerant loop 10 In comprising liquid reservoir 25 2 expansion valves 24,26 between part exist refrigerant pressure rise when, can cause freezing The refrigerant that part in agent loop 10 between 2 expansion valves 24,26 comprising liquid reservoir 25 is present escapes into outdoor heat exchange The side of device 23, the side of indoor heat converter 41 and the side of compressor 21, prevent the fluid-tight of liquid reservoir 25.

So, in this variation, by by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25, 2nd expansion valve 26 (switchable valve), indoor heat converter 41 and extraction valve 30a connections and constitute refrigerant loop 10 in, i.e., Fully closed type expansion valve is used as the 1st expansion valve 24, the 2nd expansion valve 26 and extraction valve 30a, prevented also from the liquid of liquid reservoir 25 Envelope is without setting fluid-tight to prevent pipe.Herein, set also by by the 1st expansion valve 24 and/or extraction valve 30a with the 1st configuration status Put, the 2nd expansion valve 26 is set with the 2nd configuration status, so as to prevent the fluid-tight of liquid reservoir 25 without setting fluid-tight to prevent Pipe, and prevent fluid-tight of the hydraulic fluid side stop valve 27 (switchable valve) between the 2nd expansion valve 26.

(7) variation 4

In the air-conditioning device 1 (1~Figure 16 of reference picture) of above-mentioned embodiment and variation 1~3, in the upper of liquid reservoir 25 Swim side and downstream is provided with the 1st expansion valve 24 being made up of fully closed type expansion valve and the 2nd expansion valve 26 (switchable valve) (is also wrapped Containing the structure with extraction valve 30a), and it is provided with hydraulic fluid side stop valve between the 2nd expansion valve 26 and indoor heat converter 41 27 (switchable valves), premised on said structure, using the fluid-tight for preventing liquid reservoir 25 structure (by the 1st expansion valve 24, 2nd expansion valve 26 and/or extraction valve 30a are set with the 1st configuration status).

If however, being only conceived to the fluid-tight of liquid reservoir 25, it is assumed that following situation：Opened even in the 2nd expansion valve 26 In the state of, if maloperation due to hydraulic fluid side stop valve 27 (switchable valve) etc., cause the 1st expansion valve 24 (to there is extraction valve 30a and the both sides of hydraulic fluid side stop valve 27 become full-shut position, then liquid reservoir 25 also becomes fluid-tight state.Specifically, it is considered to The 1st expansion valve 24 being made up of fully closed type expansion valve is set with the 2nd configuration status and (is made up of also having fully closed type expansion valve Extraction valve 30a in the case of, extraction valve 30a is also set with the 2nd configuration status) and will be made up of fully closed type expansion valve The situation (reference picture 6 and Figure 11) that 2nd expansion valve 26 is set with the 1st configuration status.

So, if it is also supposed that causing liquid reservoir 25 to become the feelings of fluid-tight state because of maloperation of hydraulic fluid side stop valve 27 etc. Condition, then preferably setting the 1st expansion valve 24 being made up of fully closed type expansion valve with the 1st configuration status (also has by fully closed type In the case of the extraction valve 30a that expansion valve is constituted, the 1st expansion valve 24 and/or extraction valve 30a are set with the 1st configuration status) (reference picture 2, Fig. 7, Figure 10 and Figure 12~Figure 16).

(8) variation 5

As above-mentioned variation 4, if further contemplate causes because of maloperation of hydraulic fluid side stop valve 27 (switchable valve) etc. Liquid reservoir 25 becomes the situation of fluid-tight state, then with Figure 17 and as shown in Figure 18, without the 2nd expansion valve 26 it is (switchable Valve) structure premised in the case of, it is also desirable to it is assumed that the fluid-tight of liquid reservoir 25, configure the 1st be made up of fully closed type expansion valve Expansion valve 24 (being extraction valve 30a in the case of with the extraction valve 30a being made up of fully closed type expansion valve).

Therefore, herein, the pumping constituted by the 1st expansion valve 24 being made up of fully closed type expansion valve, by fully closed type expansion valve Valve 30a is set with the 1st configuration status.Specifically, in the situation (ginseng for the extraction valve 30a not being made up of fully closed type expansion valve According to Figure 17) under, as shown in figure 19, the 1st expansion valve 24 is set with the 1st configuration status, with being made up of fully closed type expansion valve Extraction valve 30a situation (reference picture 18) under, as shown in Figure 20~Figure 22, by the 1st expansion valve 24 and/or extraction valve 30a with 1st configuration status is set

So, in the air-conditioning device 1, by by compressor 21, outdoor heat converter 23, the 1st expansion valve 24, liquid reservoir 25th, the refrigerant loop 10 that hydraulic fluid side stop valve 27, indoor heat converter 41 are connected and constituted is (in the feelings with extraction valve 30a Under condition, also comprising extraction valve 30a) in, even if using fully closed type expansion valve as the 1st expansion valve 24 (with extraction valve 30a's In the case of, it is used as extraction valve 30a using fully closed type expansion valve), the fluid-tight prevented also from liquid reservoir 25 is prevented without setting fluid-tight Only manage.

Industrial practicality

Disclosed by the invention is widely suitable to by compressor, outdoor heat converter, the 1st expansion valve, liquid reservoir, switchable The air-conditioning device for the refrigerant loop that valve, indoor heat converter are connected and constituted.

Symbol description

1 air-conditioning device

10 refrigerant loops

21 compressors

23 outdoor heat converters

41 indoor heat converters

24 the 1st expansion valves

26 the 2nd expansion valves (switchable valve)

27 hydraulic fluid side stop valves (switchable valve)

30a extraction valves

52a tops valve chamber (space of the needle of valve seat away from direction side)

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

55 valve seats

61 needles

62 springs

Prior art literature

Patent document

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

Claims

1. a kind of air-conditioning device (1), the air-conditioning device has compressor (21), outdoor heat converter (23), the 1st expansion valve (24), the refrigerant loop that liquid reservoir (25), switchable valve (26,27), indoor heat converter (41) are sequentially connected and constituted (10), it is characterised in that

As the 1st expansion valve, expanded using because of the fully closed type that needle (61) is resisted against valve seat (55) and is in full-shut position Valve, also, the 1st expansion valve is arranged under the refrigerant loop, the 1st configuration status with the 1st configuration status, setting The moving direction of the needle when needle is resisted against the valve seat is needle direction of advance and sets the needle away from institute The moving direction of needle when stating valve seat for needle away from direction when, the refrigerant from the liquid reservoir is from the valve seat The needle direction of advance side flow into, by the gap between the needle and the valve seat, described in the valve seat Needle flows out away from direction side,

Have with the 1st expansion valve that the 1st configuration status is arranged at the refrigerant loop in the full-shut position The spring (62) that the needle for being resisted against the valve seat is acted on towards the needle direction of advance, the 1st expansion valve is constituted For the pressure of the refrigerant in the space (52b) of the needle direction of advance side of the valve seat, described with the valve seat Pressure differential between the pressure of refrigerant in space (52a) of the needle away from direction side presses off valve pressure differential to be inverse, if by This is inverse press off the generation of valve pressure differential by the needle towards the needle away from the power that direction is pressed overcome the spring towards institute The active force of needle direction of advance is stated, then releases the state that the needle is resisted against the valve seat.

2. air-conditioning device (1) as claimed in claim 1, it is characterised in that

The switchable valve is hydraulic fluid side stop valve (27).

3. air-conditioning device (1) as claimed in claim 1, it is characterised in that

The switchable valve is the 2nd expansion valve (26),

As the 2nd expansion valve, expanded using because of the fully closed type that needle (61) is resisted against valve seat (55) and is in full-shut position Valve,

In the case, at least one in the 1st expansion valve (24) and the 2nd expansion valve is set with the 1st configuration status It is placed under the refrigerant loop (10), the 1st configuration status, is setting the needle when needle is resisted against the valve seat Moving direction be needle direction of advance and the moving direction of needle when setting the needle away from the valve seat is needle During away from direction, the refrigerant from the liquid reservoir is flowed into from the needle direction of advance side of the valve seat, passes through institute The gap between needle and the valve seat is stated, is flowed out to the needle of the valve seat away from direction side,

The 1st expansion valve and/or the 2nd expansion valve tool of the refrigerant loop are arranged at the 1st configuration status There is the spring (62) for acting on the needle for being resisted against the valve seat towards the needle direction of advance in the full-shut position, 1st expansion valve and/or the 2nd expansion valve are configured to the space of the needle direction of advance side of the valve seat The pressure of refrigerant in (52b), with the refrigerant in space (52a) of the needle away from direction side of the valve seat Pressure differential between pressure be it is inverse press off valve pressure differential, if by this it is inverse press off the generation of valve pressure differential by the needle towards the valve Pin overcomes the active force towards the needle direction of advance of the spring away from the power that direction is pressed, then release the needle against In the state of the valve seat.

4. air-conditioning device (1) as claimed any one in claims 1 to 3, it is characterised in that

The active force of spring when setting the full-shut position so that the liquid reservoir (25), the 1st expansion valve are set (24) saturation pressure of the refrigerant corresponding to the peak of the environment temperature and in the place of the switchable valve (26,27) is Highest saturation pressure is below the resistance to pressure pressure of the liquid reservoir with the inverse summation for pressing off valve pressure differential.

5. air-conditioning device (1) as claimed in claim 1, it is characterised in that

The refrigerant loop (10) also has the extraction valve for being used for extracting refrigerant out from the upper space of the liquid reservoir (25) (30a),

As the extraction valve, using because needle (61) is resisted against valve seat (55) and is in the fully closed type expansion valve of full-shut position,

In the case, at least one in the 1st expansion valve (24) and the extraction valve is arranged at the 1st configuration status Under the refrigerant loop, the 1st configuration status, in the mobile side for setting the needle when needle is resisted against the valve seat It is needle away from direction to the moving direction of the needle for needle direction of advance and when setting the needle away from the valve seat When, the refrigerant from the liquid reservoir is flowed into from the needle direction of advance side of the valve seat, by the needle with Gap between the valve seat, flows out to the needle of the valve seat away from direction side,

Have with the 1st expansion valve and/or the extraction valve that the 1st configuration status is arranged at the refrigerant loop The spring (62) for acting on the needle for being resisted against the valve seat towards the needle direction of advance during full-shut position, it is described 1st expansion valve and/or the extraction valve are configured to the system in the space (52b) of the needle direction of advance side of the valve seat Between the pressure of refrigerant in space (52a) of the needle of the pressure of cryogen and the valve seat away from direction side Pressure differential be it is inverse press off valve pressure differential, if by this it is inverse press off the generation of valve pressure differential by the needle towards the needle away from direction The power of pressing overcomes the active force towards the needle direction of advance of the spring, then releases the needle and be resisted against the valve seat State.

6. air-conditioning device (1) as claimed in claim 5, it is characterised in that

The switchable valve is hydraulic fluid side stop valve (27).

7. air-conditioning device (1) as claimed in claim 1, it is characterised in that

The switchable valve is the 2nd expansion valve (26),

As the 2nd expansion valve and the extraction valve, using because needle (61) is resisted against valve seat (55) and is in full-shut position Fully closed type expansion valve,

In the case, by least one in the 1st expansion valve (24), the 2nd expansion valve and the extraction valve with the 1st Configuration status is arranged under the refrigerant loop, the 1st configuration status, is setting the institute when needle is resisted against the valve seat State the moving direction of the needle of the moving direction of needle for needle direction of advance and when setting the needle away from the valve seat During for needle away from direction, the refrigerant from the liquid reservoir is flowed into from the needle direction of advance side of the valve seat, By the gap between the needle and the valve seat, flowed out to the needle of the valve seat away from direction side,

The 1st expansion valve, the 2nd expansion valve and/or the institute of the refrigerant loop are arranged at the 1st configuration status State extraction valve and have and act on the needle for being resisted against the valve seat towards the needle direction of advance in the full-shut position Spring (62), the 1st expansion valve, the 2nd expansion valve and/or the extraction valve are configured to the needle of the valve seat The pressure of refrigerant in the space (52b) of direction of advance side, sky of the needle away from direction side with the valve seat Between refrigerant in (52a) pressure between pressure differential be it is inverse press off valve pressure differential, if being produced by the inverse valve pressure differential that presses off The effect towards the needle direction of advance that the needle is overcome to the spring towards the needle away from the power that direction is pressed Power, then release the state that the needle is resisted against the valve seat.

8. the air-conditioning device (1) as any one of claim 5 to 7, it is characterised in that

The active force of spring when setting the full-shut position so that the liquid reservoir (25), the 1st expansion valve are set (24), the system corresponding to the peak of the environment temperature in the place of the switchable valve (26,27) and the extraction valve (30a) The saturation pressure of cryogen be highest saturation pressure, with it is described it is inverse press off valve pressure differential summation be the liquid reservoir resistance to pressure pressure Below.

9. air-conditioning device (1) as claimed in claim 4, it is characterised in that

The resistance to pressure pressure of the liquid reservoir (25) is pressure obtained from the design pressure of the liquid reservoir is multiplied by into safety coefficient Force value.

10. air-conditioning device (1) as claimed in claim 8, it is characterised in that

11. the air-conditioning device (1) as described in claim 1 or 5, it is characterised in that

The switchable valve be the 2nd expansion valve (26) and be connected to the 2nd expansion valve and the indoor heat converter (41) it Between hydraulic fluid side stop valve (27),

As the 2nd expansion valve, expanded using because of the fully closed type that needle (61) is resisted against valve seat (55) and is in full-shut position Valve, also, the 2nd expansion valve is arranged under the refrigerant loop (10), the 2nd configuration status with the 2nd configuration status, Refrigerant from the liquid reservoir (25) is flowed into from the needle of the valve seat away from direction side, by the needle with Gap between the valve seat, flows out to the needle direction of advance side of the valve seat,

Have with the 2nd expansion valve that the 2nd configuration status is arranged at the refrigerant loop in the full-shut position The spring (62) that the needle for being resisted against the valve seat is acted on towards the needle direction of advance, is configured to the valve It is the pressure of refrigerant in the space (52b) of the needle direction of advance side of seat, remote with the needle of the valve seat Pressure differential between the pressure of refrigerant in the space (52a) of direction side be it is inverse press off valve pressure differential, if inverse being pressed off by this Valve pressure differential produce by the needle towards the needle away from the power that direction is pressed overcome the spring towards before the needle Enter the active force in direction, then release the state that the needle is resisted against the valve seat.

12. air-conditioning device (1) as claimed in claim 11, it is characterised in that

The active force of the spring of the 2nd expansion valve when setting the full-shut position so that the 2nd expansion valve is set (26) saturation pressure of the refrigerant corresponding to the peak of the environment temperature and in the place of the hydraulic fluid side stop valve (27) I.e. highest saturation pressure, with the inverse summation for pressing off valve pressure differential of the 2nd expansion valve be to constitute the refrigerant loop (10) minimum value of the resistance to pressure pressure of the part of the part in from the 2nd expansion valve untill the hydraulic fluid side stop valve with Under.

13. air-conditioning device (1) as claimed in claim 12, it is characterised in that

Constitute the portion from the 2nd expansion valve (26) untill the hydraulic fluid side stop valve (27) in the refrigerant loop (10) Point the resistance to pressure pressure of part be will constitute in the refrigerant loop from the 2nd expansion valve to the hydraulic fluid side section Only the design pressure of the part of the part untill valve is multiplied by pressure value obtained from safety coefficient.