CN110199120A - Variable displacement compressor - Google Patents

Abstract

There is provided that structure is simple and the easy variable displacement compressor of layout of valve gear.Variable displacement compressor includes: control valve (300), which is set to pressure supply passageway, which be connected to discharge room (142) with crank chamber (140)；Switching valve (350), the switching valve (350) is configured at the axis than drive shaft (110) and more leans at the position on the downside of gravity direction, and is set to the ratio control valve (300) of above-mentioned pressure supply passageway more at the position of crank chamber (140) side and has the interconnecting part being connected to suction chamber；And throttle passage (320), the throttle passage (320) are connected to the pressure supply passageway (145a) between control valve (300) and switching valve (350) with suction chamber (141).When control valve (300) closes above-mentioned pressure supply passageway, the connection of pressure supply passageway (145b) between pressure supply passageway (145a) between control valve (300) and switching valve (350) and switching valve (350) and crank chamber (140) is truncated switching valve (350), and is connected to the pressure supply passageway (145b) between switching valve (350) and crank chamber (140) with suction chamber (141) via above-mentioned interconnecting part.

Description

Variable displacement compressor

Technical field

The present invention relates to variable displacement compressors, more particularly to are controlled by the pressure adjusting of crank chamber to discharge capacity The variable displacement compressor of system.

Background technique

As an example of this variable displacement compressor, variable displacement compressor documented by patent document 1 includes: to be used for The refrigerant in discharge pressure region is supplied to the supply passageway of crank chamber；The passage sections product of supply passageway is adjusted First control valve；For the refrigerant of crank chamber to be expelled to the drain passageway in suction pressure region；To the access of drain passageway The second control valve that sectional area is adjusted；And it is configured at the first control valve in supply passageway and between crank chamber to prevent Refrigerant is from crank chamber to the check-valves of the first control valve adverse current.

Existing technical literature

Patent document

Patent document 1: Japanese Patent Laid-Open 2011-185138 bulletin

Summary of the invention

The technical problems to be solved by the invention

However, the first valve gear controlled in the supply individually comprised to refrigerant to crank chamber, to refrigerant The second valve gear and prevention refrigerant controlled from the discharge of crank chamber is from crank chamber to the third of the first valve gear adverse current In the variable displacement compressor of valve gear, the structure of variable displacement compressor can inevitably become complicated.In addition, in variable capacity pressure Miniaturization also is also required that with other most of equipment in contracting machine, by the second valve gear and third valve gear layout in variable capacity It can be become difficult in compressor.

Thus, the purpose of the present invention is to provide a kind of variable displacement compressor, structure is simply and the layout of valve gear is held Easily.

Technical scheme applied to solve the technical problem

According to an aspect of the present invention, the variable capacity controlled discharge capacity is adjusted by the indoor pressure of crank Capacity compressor includes: control valve, and above-mentioned control valve is set to pressure supply passageway, and above-mentioned pressure supply passageway makes discharge room and crank Room connection；Switching valve, above-mentioned switching valve are configured at the axis than drive shaft and more lean at the position on the downside of gravity direction, and are set to upper State it is in pressure supply passageway, more leaned on than above-mentioned control valve at the position of above-mentioned crank chamber side, and have and suction chamber connect Logical interconnecting part；And throttle passage, above-mentioned throttle passage keep the supply of the pressure between above-mentioned control valve and above-mentioned switching valve logical Road is connected to above-mentioned suction chamber.Above-mentioned switching valve is configured to when above-mentioned control valve closes above-mentioned pressure supply passageway, will be upper State the above-mentioned pressure supply passageway between control valve and above-mentioned switching valve and the pressure between above-mentioned switching valve and above-mentioned crank chamber The connection of supply passageway is truncated, and supplies the above-mentioned pressure between above-mentioned switching valve and above-mentioned crank chamber via above-mentioned interconnecting part It is connected to access with above-mentioned suction chamber.

Invention effect

In above-mentioned variable displacement compressor, above-mentioned switching valve, which has, closes above-mentioned pressure supply passageway in above-mentioned control valve The discharge of the refrigerant from above-mentioned crank chamber is controlled when closing function and prevent refrigerant from above-mentioned crank chamber to The function of above-mentioned control valve adverse current.Therefore, compared with individually there is the case where valve gear of each function, variable capacity compression The structure can be simplified for machine, and the layout of the valve gear in variable displacement compressor becomes easy.

Detailed description of the invention

Fig. 1 is the cross-sectional view of the variable displacement compressor of embodiment of the present invention.

Fig. 2 is the cross-sectional view for indicating the structure of control valve of above-mentioned variable displacement compressor.

Fig. 3 is the figure for indicating the relationship between the coil turn on angle of above-mentioned control valve and setting pressure.

Fig. 4 is the main portion sectional view of above-mentioned control valve, wherein (a) of Fig. 4 indicates the state that throttle passage is opened, (b) of Fig. 4 indicates the state that above-mentioned throttle passage is closed.

Fig. 5 is the cross-sectional view for indicating the structure of switching valve of first embodiment, wherein (a) of Fig. 5 is indicated to crank chamber The pressure supply state of supply, (b) of Fig. 5 indicate the pressure release state from above-mentioned crank chamber pressure release.

Fig. 6 is the figure for indicating the valve assembly (valve shell, spool and the first valve seat forming portion) of above-mentioned switching valve.

Fig. 7 is the figure being illustrated for the localization method to above-mentioned valve assembly.

Fig. 8 is illustrated for the movement to above-mentioned variable displacement compressor (above-mentioned control valve, above-mentioned switching valve) Figure.

Fig. 9 is illustrated for the movement to above-mentioned variable displacement compressor (above-mentioned control valve, above-mentioned switching valve) Figure.

Figure 10 is illustrated for the movement to above-mentioned variable displacement compressor (above-mentioned control valve, above-mentioned switching valve) Figure.

Figure 11 is the cross-sectional view for indicating the structure of switching valve of second embodiment.

Figure 12 is the cross-sectional view for indicating the structure of switching valve of third embodiment.

Figure 13 is the cross-sectional view for indicating the structure of switching valve of the 4th embodiment.

Figure 14 is the cross-sectional view for indicating the structure of switching valve of the 5th embodiment.

Figure 15 is the cross-sectional view for indicating the structure of switching valve of sixth embodiment, wherein (a) of Figure 15 is indicated to crank The pressure supply state of room supply, (b) of Figure 15 indicate the pressure release state from above-mentioned crank chamber pressure release.

Specific embodiment

Hereinafter, being illustrated referring to attached drawing to the variable displacement compressor of embodiment of the present invention.Embodiment can be changed Capacity compressor main composition is the clutchless compressor suitable for vehicle air conditioner system.

[first embodiment]

" overall structure of variable displacement compressor "

Fig. 1 is the cross-sectional view of the variable displacement compressor 100 of embodiment of the present invention.Variable displacement compressor 100 includes: Cylinder body 101, above-mentioned cylinder body 101 are formed with multiple cylinder bore 101a；Front casing 102, above-mentioned front casing 102 are set to the one of cylinder body 101 End side；And cylinder cap 104, above-mentioned cylinder cap 104 are set to the another side of cylinder body 101 across valve plate 103.By cylinder body 101 and preceding outer Shell 102 constitutes crank chamber 140, and drive shaft 110 is arranged to cross in crank chamber 140.

Inclined plate 111 is configured with around the axial middle part of drive shaft 110.Inclined plate 111 is configured to via link mechanism 120 are attached to the rotor 112 for being fixed on drive shaft 110, and can be (oblique relative to the angle of the axis of drive shaft 110 to inclined plate 111 The inclination angle of plate 111) it changes.

Link mechanism 120 includes: the first arm 112a, and above-mentioned first arm 112a is provided projectingly from rotor 112；Second arm 111a, above-mentioned second arm 111a are provided projectingly from inclined plate 111；And link arm 121, the one end of above-mentioned link arm 121 via First connecting pin 122, which is connected to, to be freely rotated relative to the first arm 112a, and another side is connected to via the second connecting pin 123 It can be freely rotated relative to the second arm 111a.

For the through-hole 111b for the inclined plate 111 that drive shaft 110 is inserted it is formed to that inclined plate 111 is made to incline in inclination maximum and minimum Banking motion in the range of angle.The minimum angle-of-incidence limiting unit abutted with drive shaft 110 is formed in through-hole 111b.By inclined plate 111 it is orthogonal with drive shaft 110 (axis) when inclined plate 111 inclination angle be set as 0 ° in the case where, the above-mentioned minimum of through-hole 111b Inclination angle limiting unit is formed as, and abuts when the inclination angle of inclined plate 111 is substantially 0 ° with drive shaft 110, and to the further of inclined plate 111 Banking motion is limited.When the inclination angle of inclined plate 111 is inclination maximum, inclined plate 111 is abutted with rotor 112, with to it into one Step banking motion is limited.

Inclination angle is installed in drive shaft 110 and reduces spring 114 and inclination angle increase spring 115, spring 114 is reduced at above-mentioned inclination angle Inclined plate 111 is exerted a force towards the direction for the inclination angle reduction for making inclined plate 111, above-mentioned inclination angle increases spring 115 for inclined plate 111 towards making inclined plate The direction force that 111 inclination angle increases.The configuration of spring 114 is reduced between inclined plate 111 and rotor 112 in inclination angle, and inclination angle increases bullet Spring 115 is mounted on inclined plate 111 and is fixed between the spring support member 116 of drive shaft 110.

Here, the force for being set as inclination angle increase spring 115 subtracts than inclination angle when the inclination angle of inclined plate 111 is minimum angle-of-incidence The force of few spring 114 is big, when drive shaft 110 does not rotate, inclined plate 111 be located in inclination angle reduce the force of spring 114 with Inclination angle increases the tilting position of the force balance of spring 115.

One end (left end in Fig. 1) of drive shaft 110 is towards running through in the shaft sleeve part 102a outstanding of the outside of front casing 102 And extend to the outside of front casing 102.In addition, being linked with the power transmitting dress of illustration omitted in above-mentioned one end of drive shaft 110 It sets.It is equipped with gland seal device 130 between drive shaft 110 and shaft sleeve part 102a, is blocked in crank chamber 140 with exterior space.By driving The union body that moving axis 110 and the rotor 112 for being fixed on drive shaft 110 are constituted is supported by bearing 131,132 in radial directions, It is supported in thrust direction by bearing 133, thrust plate 134.In addition, drive shaft 110 is configured to because of the power from external drive source It is passed to above-mentioned power transmission, and is synchronously rotated with the rotation of above-mentioned power transmission.In addition, drive shaft 110 The other end, i.e. 134 side of thrust plate end and thrust plate 134 between gap be conditioned as defined in screw 135 is adjusted to Gap.

Piston 136 is configured in each cylinder bore 101a.Piston 136 is being formed in towards protruding portion outstanding in crank chamber 140 Inner space contain inclined plate 111 peripheral part and its near, inclined plate 111 is configured to via a pair of of crawler shoe 137 and and piston 136 interlock.In addition, being rotated by inclined plate 111 along with the rotation of drive shaft 110, so that piston 136 is past in cylinder bore 101a It is multiple mobile.That is, by the switching mechanism being made of inclined plate 111, link mechanism 120 and a pair of of crawler shoe 137 etc., by drive shaft 110 rotary motion is converted to the reciprocating movement of piston 136.

It is divided on cylinder cap 104 and is formed with the suction chamber 141 for being formed in central portion and annularly wraps above-mentioned suction chamber 141 The discharge room 142 enclosed.Suction chamber 141 and cylinder bore 101a via the intercommunicating pore 103a for being set to valve plate 103 and are formed in inlet valve shape It is connected at the inlet valve (not shown) of plate 150.Discharge room 142 and cylinder bore 101a form plate 151 via discharge valve is formed in Discharge valve (illustration omitted) is connected to the intercommunicating pore 103b set on valve plate 103.

In addition, front casing 102, central washer (not shown), cylinder body 101, cylinder washer 152, inlet valve form plate 150, valve Plate 103, discharge valve form plate 151, Cover Gasket circle 153, cylinder cap 104 and are sequentially connected, and are fastened by multiple in-and-out bolts 105, with Form compressor main body.In addition, drive shaft 110 is supported on above-mentioned compressor main body in a manner of revolvable.

The top of cylinder body 101 is equipped with muffler.Because The lid component 106 and muffler form wall 101b across the close of illustration omitted Envelope component simultaneously uses bolt fastening, to form muffler, wherein above-mentioned The lid component 106 is formed with discharge port 106a, above-mentioned Muffler forms the top that wall 101b is formed in cylinder body 101.

Silencer space 143 that wall 101b is surrounded is formed via communication path 144 by The lid component 106 and muffler and with spit Room 142 is connected to out, and discharge check-valves 200 is configured in silencer space 143.Discharge check-valves 200 is configured at communication path 144 with the interconnecting piece of silencer space 143.Discharge check-valves 200 is in response to communication path 144 (upstream side) and silencer space Pressure difference between 143 (downstream sides) and act, in the case where above-mentioned pressure difference is less than specified value, discharge check-valves 200 will be even Path 144 is closed, and in the case where pressure difference is greater than specified value, discharge check-valves 200 opens communication path 144.

Communication path 144, discharge check-valves 200, silencer space 143 and discharge port 106a constitute variable capacity compression The discharge access of machine 100.Refrigerant circuit of the discharge room 142 via above-mentioned discharge access and with above-mentioned air conditioner system (high-pressure side) connection.

The suction passage being made of inhalation port (illustration omitted) and communication path 104a is formed in cylinder cap 104.On State suction passage linear extension in a manner of crossing a part of discharge room 142 on the outside of the diameter of cylinder cap 104.Suction chamber 141 It is connect via above-mentioned suction passage with the refrigerant circuit of above-mentioned air conditioner system (low-pressure side).

It is formed with pressure supply passageway 145 (aftermentioned) in cylinder body 101 and cylinder cap 104, above-mentioned pressure supply passageway 145 makes to spit Room 142 is connected to crank chamber 140 out, is equipped with control valve 300 in pressure supply passageway 145.In the present embodiment, control valve 300 are disposed in the first accepting hole 104b for constituting 145 a part of pressure supply passageway, and are configured to pressure supply passageway 145 aperture (passage sections product) is adjusted.First accepting hole 104b is formed in a manner of along the radially extending of cylinder cap 104 Cylinder cap 104.First accepting hole 104b is connected to via communication path 104c with suction chamber 141.

Control valve 300 is according to the pressure of the suction chamber 141 imported via communication path 104c and based on external signal in spiral shell The aperture (passage sections product) of pressure supply passageway 145 is adjusted in electromagnetic force caused by the electric current flowed in spool, by This, controls the import volume (pressure supply amount) of the refrigerant (discharge gas) in discharge room 142 towards crank chamber 140.Separately Outside, control valve 300 is described in detail below.

It is in pressure supply passageway 145, farther downstream than control valve 300 at the position of side (140 side of crank chamber), match Equipped with switching valve 350.Switching valve 350 is configured at the second accepting hole 140d, and it is logical that above-mentioned second accepting hole 140d constitutes pressure supply The a part on road 145.In the present embodiment, with cylinder body 101 opposite binding face one of the second accepting hole 104d in cylinder cap 104 Side has opening, and is connected to suction chamber 141.Specifically, the second accepting hole 104d is open towards suction chamber 141.

In the present embodiment, pressure supply passageway 145 is by the first accepting hole 104b, the second accepting hole 104d, access Diameter 104f, communication path 104e and communication path 101c are constituted, wherein above-mentioned communication path 104f makes discharge room 142 and the One accepting hole 104b connection, above-mentioned communication path 104e are connected to the first accepting hole 104b with the second accepting hole 104d, above-mentioned company Path 101c is connected to the second accepting hole 104d with crank chamber 140.Communication path 104e and 104f are formed in cylinder cap 104, even Path 101c is formed in cylinder body 101.

In addition, in the following description, by the region between the control valve 300 and switching valve 350 of pressure supply passageway 145 Referred to as " the pressure supply passageway 145a between control valve 300 and switching valve 350 ", by the switching valve in pressure supply passageway 145 Region between 350 and crank chamber 140 is referred to as " the pressure supply passageway 145b between switching valve 350 and crank chamber 140 ".

In the present embodiment, the pressure supply passageway 145a between control valve 300 and switching valve 350 is by control valve 300 Ratio control valve 300 in the region of interior side farther downstream than valve opening 301c (350 side of switching valve), the first accepting hole 104b is more A part of region in the region of downstream, communication path 104e and the second accepting hole 104d is constituted.In addition, switching valve 350 By being formed in tabular component, (inlet valve forms plate 150, valve plate 103 and spits pressure supply passageway 145b between crank chamber 140 Valve forms plate 151 etc. out) through-hole and communication path 101c constitute, wherein above-mentioned tabular component configuration is in cylinder cap 104 and cylinder body Between 101.

Switching valve 350 be configured to make the pressure supply passageway 145b between switching valve 350 and crank chamber 140 from discharge The state that room 142 is connected to switches to the state being connected to suction chamber 141 or switches to from the state being connected to suction chamber 141 The state being connected to discharge room 142.Switching valve 350 is configured to interlock with the opening and closing of control valve 300, and by switching valve 350 and bent Pressure supply passageway 145b between handle room 140, which is switched to, is connected to crank chamber 140 with suction chamber 141 via switching valve 350 In other words first discharge access 146a switches to the first discharge access 146a between switching valve 350 and crank chamber 140.Separately Outside, it will be described in detail later in this article about the structure of switching valve 350 and movement, if but summary is illustrated, as described below. That is, switching valve 350 has the interconnecting part (being equivalent to aftermentioned third port 351a1) being connected to suction chamber 141.In control valve 300 when opening, switching valve 350 make pressure supply passageway 145a between control valve 300 and switching valve 350 and switching valve 350 with Pressure supply passageway 145b connection between crank chamber 140.In addition, making pressure supply passageway 145 when control valve 300 is closed It, will be between the pressure supply passageway 145a between control valve 300 and switching valve 350 and switching valve 350 and crank chamber 140 when closing Pressure supply passageway 145b connection truncation, and make the pressure between switching valve 350 and crank chamber 140 via above-mentioned interconnecting part Supply passageway 145b is connected to suction chamber 141.

In addition, crank chamber 140 passes through via communication path 101d, space 101e and the fixed knot for being formed in valve plate 103 The second discharge access 146b of discharge orifice 103c, is connected to suction chamber 141 always.It is switched that is, variable displacement compressor 100 has The first discharge access 146a that valve 350 is opened and closed and the second discharge access 146b for opening always, using as making crank chamber 140 and suction It enters the room the discharge accesses of 141 connections.Here, the minimum path sectional area of the first discharge access 146a is set to lead to than the second discharge The passage sections product of the fixed orifice 103c of road 146b is big.

In addition, pressure supply passageway 145a, the suction chamber 141 between control valve 300 and switching valve 350 be configured to pass through through It is connected to by the throttle passage 320 (aftermentioned) in control valve 300.Thus, if control valve 300 closes and makes pressure supply passageway 145 close, then the pressure of the pressure ratio crank chamber 140 of the pressure supply passageway 145a between control valve 300 and switching valve 350 It is small.At this point, switching valve 350 pressure supply passageway 145 is closed (by pressure supply passageway 145a and pressure supply passageway 145a it Between connection truncation), to prevent refrigerant from 140 1 side of crank chamber to the adverse current of control valve 300, on the other hand, by the first discharge The aperture of access 146a is set as maximum opening.Specifically, switching valve 350, which switches to, to be made between switching valve 350 and crank chamber 140 The state that is connected to suction chamber 141 of pressure supply passageway 145b (that is, the first discharge between switching valve 350 and crank chamber 140 Access 146a).The above-mentioned discharge access for being connected to crank chamber 140 with suction chamber 141 is by the first discharge access 146a and Two discharge access 16b are constituted, and therefore, the passage sections product of above-mentioned discharge access is maximum.Certainly, the first discharge access 146a's is logical Road sectional area also becomes maximum.Thus, the refrigerant in crank chamber 140 is via the first discharge access 146a and the second discharge access 146b promptly flows out (discharge) to suction chamber 141, so that the pressure of crank chamber 140 is identical as the pressure of suction chamber 141.This The inclination angle of sample, inclined plate 111 becomes maximum, and the stroke (that is, discharge capacity of variable displacement compressor 100) of piston 136 becomes most Greatly.

On the other hand, when control valve 300 is opened and opens pressure supply passageway 145, control valve 300 and switching valve The pressure of pressure supply passageway 145a between 350 rises, when the pressure supply passageway between control valve 300 and switching valve 350 When the pressure of 145a becomes larger than the pressure of crank chamber 140, switching valve 350 opens pressure supply passageway 145, and by first Discharge access 146a is closed.Specifically, switching to the pressure supply passageway 145b made between switching valve 350 and crank chamber 140 The state (that is, pressure supply passageway 145a between switching valve 350 and crank chamber 140) being connected to discharge room 142.On as a result, It states discharge access to be made of only the second discharge access 146b, the passage sections product of above-mentioned discharge access is minimum.Certainly, the first discharge The passage sections product of access 146a also becomes minimum.Thus, the refrigerant of discharge room 142 is supplied via pressure supply passageway 145 To crank chamber 140, on the other hand, the case where refrigerant of crank chamber 140 flows out to suction chamber 141, is restricted, to make song The pressure of handle room 140 becomes easy rising.Thus, the pressure in crank chamber 140 rises according to the aperture of control valve 300, tiltedly The inclination angle of plate 111 reduces since maximum, so as to which the stroke of piston 136 is changeably controlled.

In this way, variable displacement compressor 100 is adjusted by the pressure in crank chamber 140 to control discharge capacity Compressor.In addition, the oil of lubrication is sealed in the inside of variable displacement compressor 100, by along with drive shaft 110 Rotation and carry out oil stirring or along with refrigerant gas movement and occur oil movement, so as to make can be changed The inside of capacity compressor 100 is lubricated.

" basic structure of control valve 300 "

Fig. 2 is the cross-sectional view for indicating the structure of control valve 300, Fig. 3 be indicate oily turn on angle (electric current I) and setting pressure it Between relationship figure.As shown in Fig. 2, in the present embodiment, control valve 300 includes valve cell and that valve cell is opened and closed is dynamic The driving unit (solenoid) of work.

The valve cell of control valve 300 has cylindric valve shell 301.In the inside of valve shell 301 from above-mentioned valve shell 301 one end (lower end) lateral edge is axially successively abreast formed with the first pressure-sensitive room 302, valve chamber 303 and the second pressure-sensitive room 307.

First pressure-sensitive room 302 via the intercommunicating pore 301a for the outer peripheral surface for being formed in valve shell 301, the first accepting hole 104b, Communication path 104e, the second accepting hole 104d and communication path 101c and be connected to crank chamber 140.Second pressure-sensitive room 307 warp By be formed in intercommunicating pore 301e, the first accepting hole 104b and the communication path 104c of the outer peripheral surface of valve shell 301 and with sucking Room 141 is connected to.Valve chamber 303 via the outer peripheral surface for being formed in valve shell 301 intercommunicating pore 301b, the first accepting hole 104b and company Path 104f and be connected to discharge room 142.First pressure-sensitive room 302 is configured to be connected to via valve opening 301c with valve chamber 303.? Support holes 301d is formed between valve chamber 303 and the second pressure-sensitive room 307.

Bellows 305 is equipped in the first pressure-sensitive room 302.The inside of bellows 305 is set as vacuum and will be in spring It sets.Bellows 305 is configured to have along the axially displaced of valve shell 301 as the pressure born in the first pressure-sensitive room 302 The function of the pressure element of power, pressure i.e. in crank chamber 140.

Columned spool 304 is contained in valve chamber 303.Spool 304 is configured to its outer peripheral surface and support holes 301d's Inner peripheral surface is close to, and can slide in support holes 301d, so as to move along the axis direction of valve shell 301.Spool 304 Valve opening 301c can be opened, be closed by one end (lower end), and the other end (upper end) of spool 304 is projected into the second pressure-sensitive room 307.

In above-mentioned one end of spool 304, protrusion is formed with rodlike linking part 306.Match the end (front end) of linking part 306 Being set to can abut with bellows 305, and have the function that the displacement of bellows 305 is transferred to spool 304.

Driving unit has cylindric solenoid cover 312.Solenoid cover 312 is coaxially linked to valve shell 301 The other end (upper end).Molded coil 314 made of useful resin covers electromagnetic coil is accommodated in solenoid cover 312.This Outside, the inside of the molded coil 314 in solenoid cover 312 contains the cylindric fixation concentric with molded coil 314 Core 310.Fixed core 310 extends to the central vicinity of molded coil 314 from valve shell 301.Opposite with valve shell 301 one The end of the solenoid cover 312 of side is blocked by the sleeve 313 for the bottomed tube being arranged in a manner of surrounding fixed core 310.

Fixed core 310 has an insertion hole 310a in center, and one end (lower end) of insertion hole 310a is towards the second pressure-sensitive room 307 openings.In addition, containing cylindric movable cores between fixed core 310 and the closure end (bottom) of sleeve 313 308。

Insert has solenoid rod 309 in insertion hole 310a.One end (lower end) of solenoid rod 309 is pressed into fixed in valve The above-mentioned other end of core 304, the other end (upper end) of solenoid rod 309 are fitted (indentation) to being formed in movable cores 308 Through-hole.That is, spool 304, movable cores 308 and solenoid rod 309 are integrated.In addition, fixed core 310 with can Forcible aborting spring 311 is provided between dynamic core 308, above-mentioned forcible aborting spring 311 is by movable cores 308 towards far from fixed The direction (valve opening position) of core 310 exerts a force.

Movable cores 308, fixed core 310 and solenoid cover 312 are formed by magnetic material, to constitute magnetic circuit.It is another Aspect, sleeve 313 are formed by the stainless steel-like material of non-magnetic material.

Molded coil 314 is connect via signal wire etc. with control device (not shown), and above-mentioned control device is set to variable The outside of capacity compressor 100.When supplying control electric current I from above-mentioned control device, molded coil 314 generates electromagnetic force F (I).When molded coil 314 generates electromagnetic force F (I), movable cores 308 are aspirated towards fixed core 310, so that spool 304 is mobile towards valve closing direction.

On the spool 304 of control valve 300, other than the electromagnetic force F (I) generated by molded coil 314, also effect has The active force f that is applied by forcible aborting spring 311, the power generated by the pressure (discharge pressure Pd) of valve chamber 303, by the first pressure-sensitive Power that the pressure (crank chamber pressure Pc) of room 302 generates, by power that the pressure (suction pressure Ps) of the second pressure-sensitive room 307 generates with And by bellows 305 the directed force F that applies of built-in spring.Here, due to by effective compression area Sb of bellows 305, Sb is set as by the sectional area Sr of the area for the valve opening 301c that spool 304 covers i.e. sealing area Sv, the cylinder outer peripheral surface of spool 304 =Sv=Sr, therefore, the balance for acting on the power of spool 304 are indicated by following mathematical expressions (1), if following mathematical expressions (1) is become Shape then becomes following mathematical expressions (2).In addition, symbol "+" indicates the valve closing direction of spool 304, symbol in mathematical expression (1), (2) Number "-" indicates the valve opening position of spool 304.

F (I)-f+PsSb-F=0 ... (1)

Ps=(F+f-F (I))/Sb ... (2)

When the pressure of suction chamber 141 is greater than electric current (that is, control electric current I) setting by flowing in molded coil 314 When setting pressure, in order to increase discharge capacity, the union body of bellows 305, linking part 306 and spool 304 reduces pressure and supplies To the aperture (passage sections product) of access 145, so that the pressure of crank chamber 140 declines, when the pressure of suction chamber 141 is less than setting When pressure, in order to reduce discharge capacity, it is logical that the connector of bellows 305, linking part 306 and spool 304 increases pressure supply The aperture (passage sections product) on road 145, so that the pressure of crank chamber 140 rises.That is, control valve 300 supplies pressure The aperture (passage sections product) of access 145 carries out self-contr ol, so that the pressure of suction chamber 141 is close to setting pressure.

Since on spool 304, the electromagnetic force of molded coil 314 is acted on via solenoid rod 309 towards valve closing direction, because This, when increasing to the turn on angle of molded coil 314, the power in the direction for reducing the aperture of pressure supply passageway 145 be will increase, Setting pressure can be towards reduction direction change as shown in Figure 3.Above-mentioned control device passes through the range in such as 400Hz~500Hz The energization of the opposite molded coil 314 of pulsewidth modulation (PWM control) under assigned frequency is controlled, and to pulsewidth (duty ratio) into Row changes, so that flowing through the current value of molded coil 314 becomes desired value.

In the movement of above-mentioned air conditioner system, under the action state of variable displacement compressor 100, above-mentioned control dress It sets based on the air-conditioning setting (set temperature etc.) and external environment in above-mentioned air conditioner system, to towards molded coil 314 Turn on angle is adjusted.As a result, by make suction chamber 141 pressure become setting pressure corresponding with above-mentioned turn on angle in a manner of pair Discharge capacity is controlled.On the other hand, in the non-action of above-mentioned air conditioner system, variable displacement compressor 100 Non-action status under, above-mentioned control device will to the energization of molded coil 314 cut off.Pressure supply passageway the last 145 as a result, Release spring 311 processed is opened, and the discharge capacity of variable displacement compressor 100 is controlled as the smallest state.

" throttle passage 320 "

In the present embodiment, throttle passage 320 is configured to make control valve 300 and switching valve via inside control valve 300 The region of pressure supply passageway 145a between 350 is connected to suction chamber 141.Fig. 4 is the major part section view of control valve 300 Figure, (a) of Fig. 4 indicate the state that throttle passage 320 is opened, and (b) of Fig. 4 indicates the state that throttle passage 320 is closed.

When throttle passage 320 closes pressure supply passageway 145 to close in control valve 300, make in control valve The refrigerant in the region of the pressure supply passageway 145a between 300 and switching valve 350 is arranged towards 141 side loss of suction chamber 's.

In the present embodiment, throttle passage 320 is such as shown in (a) of Fig. 4 by intercommunicating pore 304a, intercommunicating pore 306a, connection Hole 309a, columned recess portion 304b, intercommunicating pore 309b, intercommunicating pore 301e and communication path 104c (referring to Fig.1) are constituted, In, above-mentioned intercommunicating pore 304a forms the inner space of the spool 304 after integration and linking part 306, above-mentioned intercommunicating pore 306a shape At in linking part 306 and being connected to the first pressure-sensitive room 302 with intercommunicating pore 304a, above-mentioned intercommunicating pore 309a is formed in solenoid rod 309, the inside of press-in portion that be press-fit into spool 304 and connect with intercommunicating pore 304a, above-mentioned columned recess portion 304b shape At in the above-mentioned other end (upper end) of spool 304, above-mentioned intercommunicating pore 309b is formed at the solenoid rod 309 in recess portion 304b Position and make to be connected in intercommunicating pore 309a and recess portion 304b, above-mentioned intercommunicating pore 301e is formed in the outer peripheral surface of valve shell 301, on It states communication path 104c and is formed in cylinder cap 104.

Thus, as shown in (b) of Fig. 4, when the face of the above-mentioned another side of spool 304 is (that is, the ring-type around recess portion 304b Face) 304c with the lower end surface of fixed core 310 when abutting, the closing of throttle passage 320, between control valve 300 and switching valve 350 The region of pressure supply passageway 145a i.e. the first pressure-sensitive room 302 and the connection of suction chamber 141 are truncated.

On the other hand, as shown in (a) of Fig. 4, when face (circumferentia) 304c of the above-mentioned another side of spool 304 is separate solid When determining the lower end surface of core 310, throttle passage 320 is opened, and makes the first pressure-sensitive room 302 and suction chamber 141 via throttle passage 320 Connection.Here, the intercommunicating pore 309b for being formed in solenoid rod 309 is formed as when throttle passage 320 is opened as " throttle " It plays a role.In view of the pressure supply passageway 145a between control valve 300 and switching valve 350 region refrigerant towards sucking Outflow (discharge) property of room 141, the opening area of intercommunicating pore 309b can be set to as small as possible.In addition, above-mentioned throttle can also To be set to intercommunicating pore 306a, intercommunicating pore 304a or intercommunicating pore 309a.

In 314 demagnetization of molded coil, control valve 300 makes spool under the action of the force of forcible aborting spring 311 304 above-mentioned one end far from valve opening 301c around so that valve opening be maximum.That is, pressure supply passageway 145 is opened to most Greatly.At this point, the face 304c of the above-mentioned another side of spool 304 and the lower end surface of fixed core 310 are supported as shown in (b) of Fig. 4 It connects, throttle passage 320 can be closed.On the other hand, when in molded coil 314 stream have applying greater than forcible aborting spring 311 The electromagnetic force of power play a role such current value when, above-mentioned one end of spool 304 is mobile towards the direction for closing valve opening 301c, As shown in (a) of Fig. 4, the face 304c of the above-mentioned another side of spool 304 will be saved far from the lower end surface of fixed core 310 Logical circulation road 320 is opened.

Thus, in the present embodiment, face 304c and fixation by the above-mentioned another side of the spool 304 of control valve 300 Core 310 (lower end surface) constitutes valve components (valve system), and above-mentioned valve components are opened and closed throttle passage 320.In addition, throttle passage 320 become following state (opening state), i.e., the non-action for the variable displacement compressor 100 being only unmagnetized in molded coil 314 It closes when state (OFF), is opened in action state (ON) for the variable displacement compressor 100 that molded coil 314 is excited, and It is connected to the region of the pressure supply passageway 145a between control valve 300 and switching valve 350 with suction chamber 141.

" structure and movement of switching valve 350 "

Fig. 5 is the section view for indicating to be configured at the structure of switching valve 350 (switching valve of first embodiment) of cylinder cap 104 Figure, (a) of Fig. 5 indicate to supply discharge gas to the state of crank chamber 140 (the pressure supply shape supplied towards crank chamber 140 State), (b) of Fig. 5 indicates the state (relief state discharged from crank chamber 140) that refrigerant is flowed out from crank chamber 140.

Switching valve 350 includes valve shell 351, the spool 352 for being contained in valve shell 351, the first valve seat forming portion 353 and the Two valve seat forming portion 151a.

Spool 352 includes the first valve portion 352a, above-mentioned first valve portion 352a and is configured at the one end of valve shell 351；Second Valve portion 352b, above-mentioned second valve portion 352b are configured at the another side of valve shell 351；And axle portion 352c, above-mentioned axle portion 352c First valve portion 352a and the second valve portion 352b is linked.First valve seat forming portion 353 is configured at above-mentioned one end of valve shell 351 Side.In the present embodiment, the first valve seat forming portion 353 and valve shell 351 are separately formed, and are fixed on the upper of valve shell 351 State one end.Second valve seat forming portion 354 is configured at the above-mentioned another side of valve shell 351.In the present embodiment, discharge valve The region for forming a part of plate 151 constitutes the second valve seat forming portion 151a.That is, discharge valve, which forms plate 151, is used as the second valve Seat forming portion 151a.

There is valve shell 351 cylindric peripheral wall 351a and zoning wall 351b, above-mentioned zoning wall 351b to be configured at peripheral wall Axial middle position in 351a.Is fixed in the opening of the above-mentioned one end of the peripheral wall 351a of valve shell 351 One valve seat forming portion 353, the opening of the above-mentioned another side of the peripheral wall 351a of valve shell 351 is by the second valve seat forming portion 151a (discharge valve forms plate 151) blocks.Insertion hole 351b1 is formed in zoning wall 351b.

The inside of valve shell 351 is the first valve chamber 351c and the second valve chamber 351d by zoning, wherein above-mentioned first valve chamber 351c is surrounded by the first valve seat forming portion 353, peripheral wall 351a and zoning wall 351b, and above-mentioned second valve chamber 351d is by the second valve seat Forming portion 151a, peripheral wall 351a and zoning wall 351b are surrounded.In other words, the peripheral wall 351a of valve shell 351, which has, constitutes first The inner space of valve chamber 351c and the second valve chamber 351d, the first valve chamber 351c and the second valve chamber 351d pass through zoning wall 351b zoning It opens.In addition, the first valve portion 352a of spool 352 is configured at the first valve chamber 351c, the second valve portion 352b of spool 352 is configured at Two valve chamber 351d, the axle portion 352c of spool 352 are inserted into the insertion hole 351b1 for being formed in zoning wall 351b.

First valve seat forming portion 353 is formed with first port 353a and the first valve seat 353b.That is, the first valve chamber 351c has There is first port 353a and the first valve seat 353b.First port 353a is formed through in the first valve seat forming portion 353, towards first Valve chamber 351c opening, and the pressure supply passageway 145a between control valve 300 and switching valve 350 is connected to.First valve seat 353b is formed in around the first port 353a in the face of the first side valve chamber 351c of the first valve seat forming portion 353.Because of the first valve An end face 352a1 of portion 352a is contacted with the first valve seat 353b, is separate, and first port 353a is opened, is closed.

Second port 151a1 and the second valve seat are formed in the second valve seat forming portion 151a (discharge valve forms plate 151) 151a2.That is, the second valve chamber 351d has second port 151a1 and the second valve seat 151a2.Second port 151a1 is formed through It in the second valve seat forming portion 151a, is open, and is communicated between switching valve 350 and crank chamber 140 towards the second valve chamber 351d Pressure supply passageway 145b.In addition, the second valve seat 151a2 is formed in the second side valve chamber 351d of the second valve seat forming portion 151a Face second port 151a1 around.It is contacted by an end face 352b1 of the second valve portion 352b with the second valve seat 151a2, is remote From so that second port 151a1 be opened, closed.In addition, here, discharge valve, which forms plate 151, is used as the second valve seat forming portion 151a, however, it is not limited to this.Other tabular components, i.e. valve plate 103 and the Cover Gasket being configured between cylinder body 101 and cylinder cap 104 Circle 153 is also used as the second valve seat forming portion 151a.

In addition, being formed with third port 351a1 in the peripheral wall 351a of valve shell 351, above-mentioned third port 351a1 makes second Valve chamber 351d is connected to suction chamber 141.That is, the second valve chamber 351d is in addition to second port 151a1 and the second valve seat 151a2 Except, also there is third port 351a1.

In addition, valve shell 351, the first valve seat forming portion 353 and spool 352 are by such as metal materials such as aluminium class, brass class It is formed.

As described above, spool 352 includes: that the first valve portion 352a, above-mentioned first valve portion 352a is configured at the first valve chamber 351c And it is contacted with the first valve seat 353b, is separate；Second valve portion 352b, above-mentioned second valve portion 352b be configured at the second valve chamber 351d and with Second valve seat 151a2 is contacted, is separate；And axle portion 352c, above-mentioned axle portion 352c are by the first valve portion 352a and the second valve portion 352c Connection, and it is inserted into the insertion hole 351b1 for being formed in zoning wall 351b.In the present embodiment, the first valve portion of spool 352 352a and axle portion 352c is integrally formed.The the second valve portion 352b and the first valve portion 352a and axle portion 352c of spool 352 are separately formed, And it is pressed into and is fixed on axle portion 352c.

Specifically, spool 352 is formed and being pressed into axle portion 352c to the through-hole for being formed in the second valve portion 352b, this Outside, to make the other end of the first valve portion 352a when an end face 352b1 of the second valve portion 352b is abutted with the second valve seat 151a2 The mode that 352a2 is abutted with an end face (face of the first side valve chamber 351c) 351b2 of zoning wall 351b, it is opposite to axle portion 352c It is adjusted in the pushed position along axial direction of the above-mentioned through-hole of the second valve portion 352b.Hereinafter, being illustrated referring to Fig. 6.

Firstly, an end face 352b1 of the second valve portion 352b is placed in the horizontal plane.Then, make the above-mentioned of valve shell 351 The face 351a3 of another side downward, and the second valve portion 352b is contained in the mode in valve shell 351, in other words so that Two valve portion 352b are located at as the mode in the space of the second valve portion 351d, by the face of the above-mentioned another side of valve shell 351 351a3 is placed in same level.

Then, by the integrally formed object of the first valve portion 352a and axle portion 352c from the above-mentioned one end of valve shell 351 (as The space side of one valve chamber 351c) insertion, and axle portion 352c is inserted through insertion hole 351b1.

Then, it is aligned the front end of axle portion 352c and the above-mentioned through-hole of the second valve portion 352b, and by above-mentioned integrally formed object It presses down on being pressed into axle portion 352c to the above-mentioned through-hole of the second valve portion 352b, until the other end of the first valve portion 352a 352a2 is abutted with an end face (face of the first side valve chamber 351c) 351b2 of zoning wall 351b.

In addition, by the opening for the above-mentioned one end for the first valve seat forming portion 353 being pressed into and being embedded in valve shell 351, To complete the valve assembly 350a being made of valve shell 351, spool 352 and the first valve seat forming portion 353.Valve assembly The prescribed limit of 353 side of the first valve seat side forming portion of 350a is received (chimeric) in the second accepting hole 104d, then, outside valve The opening of the above-mentioned another side of shell 351 (peripheral wall 351a) is blocked by the second valve seat forming portion 151a, thus constitutes switching valve 350。

In the present embodiment, in the stage of valve assembly 350a, the first valve portion 352a and the second valve portion 352b are in axial direction On position adjust terminate.It therefore,, can be right so as in the state of valve assembly 350a by using experimental tool etc. Situations such as following is checked: whether the abutting state of an end face 352a1 and the first valve seat 353b of the first valve portion 352a are appropriate (whether there may be the leakages of refrigerant etc.)；An end face face 352b1 of second valve portion 352b whether can properly with the second valve Seat 151a2 abuts (whether there may be the leakages of refrigerant etc.)；And/or first valve chamber 351c and the second valve chamber 351d connection Whether properly it is truncated.

Referring to figure 5 and figure 6, the structure of spool 352 is further described.First valve portion 352a of spool 352 is by One end (valve seat side end) 352a3 of one side valve seat 353b, the side zoning wall 351b the other end (zoning wall side) 352a4 and middle part (intermediate position) 352a5 are constituted, wherein above-mentioned middle part 352a5 configuration portion 352a3 and another at one end Between one end 352a4.Outer diameter of the outer diameter of intermediate position 352a5 than valve seat side 352a3 and zoning wall side The outer diameter of 352a4 is big, and the outer peripheral surface of intermediate position 352a5 is supported on the first valve chamber 351c's in a manner of with defined gap Inner peripheral surface.

Second valve portion 352b of spool 352 is formed as bottomed cylindrical, is formed in the bottom wall of above-mentioned second valve portion 352b For axle portion 352c indentation above-mentioned through-hole, and cricoid open end become contacted with the second valve seat 151a2, separate one end Face 352b1.

In addition, spool 352 has internal path 352d.Internal path 352d includes: the first access 352d1, and above-mentioned first Access 352d1 is axially extended；And alternate path 352d2, above-mentioned alternate path 352d2 are connect with the first access 352d1.The The end face of the axle portion 352c open at one end in indentation to the second valve portion 352b of one access 352d1, the first access 352d1's is another End is blocked.Alternate path 352d2 is formed at the valve seat side 352a3 of the first valve portion 352a, and makes the first access 352d1 It is connected to the first valve chamber 351c.

Thus, when the one end of an end face 352a1 far from the first valve seat 353b and the second valve portion 352b of the first valve portion 352a When face 352b1 is abutted with the second valve seat 151a2, the connection between second port 151a1 and third port 351a1 is truncated, and And first port 353a is connected to second port 151a1 via internal path 352d.On the other hand, when the first valve portion 352a's When one end face 352a1 is abutted with the first valve seat 353b to close first port 353a, an end face 352b1 of the second valve portion 352b It is left from the second valve seat 151a2, so that second port 151a1 is connected to third port 351a1.

Here, when an end face 352b1 of the second valve portion 352b is abutted with the second valve seat 151a2, the first valve portion 352a's Other end 352a2 is abutted with an end face (face of the first side valve chamber 351c) 351b2 of zoning wall 351b, therefore, via first Valve chamber 351c and the connection of the insertion hole 351b1 of the second valve chamber 351d are truncated.Thus, from the first valve chamber 351c to the second valve chamber 351d, be truncated via the flowing of insertion hole 351b1.

In addition, internal path 352d is other than including alternate path 352d2, and it further include third path 352d3, above-mentioned the Three-way 352d3 is connected to the first access 352d1 with the first valve chamber 351c.Third path 352d3 is formed in the first valve portion 352a Zoning wall side 352a4 at, and be connected to the first access 352d1 with the first valve chamber 351c.

Thus, when an end face 351b2 of the other end 352a2 and zoning wall 351b of the first valve portion 352a are abutted, Gap and first between the outer peripheral surface of the intermediate position 352a5 of first valve portion 352a and the inner peripheral surface of the first valve chamber 351c Refrigerant stream is formed between the outer peripheral surface of the zoning wall side 352a4 of valve portion 352a and the inner peripheral surface of the first valve chamber 351c.Cause And even if can also prevent in the case where from the refrigerant that first port 353a is flowed into the first valve chamber 351c including foreign matter etc. The stop of the above-mentioned foreign matter for only hindering spool 352 mobile etc..

In this way, switching valve 350 under the action of the movement of spool 352 by making an end face 352a1 of the first valve portion 352a It abuts with the first valve seat 353b to close first port 353a, so that pressure supply passageway 145 be closed.At this point, switching In valve 350, an end face 352b1 of the second valve portion is far from the second valve seat 151a2, so that second port 151a1 and third port 351a1 connection.As a result, the pressure supply passageway 145b between switching valve 350 (second port 151a1) and crank chamber 140 Be connected to suction chamber 141, pressure supply passageway 145b be switched to switching valve 350 (second port 151a1) and crank chamber 140 it Between the first discharge access 146a.

On the other hand, switching valve 350 under the action of the movement of spool 352 by making an end face of the first valve portion 352a 352a1 far from the first valve seat 353b first port 353a to be closed, so that pressure supply passageway 145 be opened.At this point, cutting It changes in valve 350, an end face 352b1 and the second valve seat 151a2 of the second valve portion 352b is abutted with by second port 151a1 and third Connection truncation between the 351a1 of port, and first port 353a is connected to second port 151a1 via internal path 352d. As a result, the first discharge access 146a and discharge room 142 between switching valve 350 (second port 151a1) and crank chamber 140 Connection, and the first discharge access 146a is made to be switched to and (be back to) switching valve 350 (second port 151a1) and crank chamber Pressure supply passageway 145b between 140.

The movement of switching valve 350 is further elaborated.

Bear the pressure (pressure of the side first port 353a in an end face (an end face 352a1 of the first valve portion 352a) for spool 352 The pressure of power supply passageway 145a) Pc '.Bear second in the other end (an end face 352b1 of the second valve portion 352b) of spool 352 The pressure Pc of the pressure (pressure of pressure supply passageway 145b) of the port side 151a1, i.e. crank chamber 140.In addition, the second valve chamber 351d is connected to via third port 351a1 with suction chamber 141, and therefore, the pressure Ps of suction chamber 141 is acted on spool 352.

Here, the compression face of the pressure Pc ' when an end face 352a1 of the first valve portion 352a is abutted with the first valve seat 353b Product is set as S1, and the compression area of a pressure Pc when end face 352b1 of the second valve portion 352b is abutted with the second valve seat 151a2 is set For S2, by abutting part when being abutted by the other end 352a2 of the first valve portion 352a with an end face 351b2 of zoning wall 351b Area as defined in diameter is set as S3.

In the state that an end face 352a1 of the first valve portion 352a is abutted with the first seat portion 353b, the pressure of crank chamber 140 Power Pc becomes the pressure Ps of suction chamber 141, therefore, for making an end face 352a1 of the first valve portion 352a far from the first valve seat The condition of 353b is following mathematical expressions (3).

Pc ' S1 > PsS1+f+F1 ... (3)

Here, symbol f is frictional force, symbol F1 is made due to the refrigerant stream impact from the side second port 151a1 Power caused by dynamic pressure on mono- end face 352b1 of the second valve portion 352b.

Thus, by the way that control valve 300 is opened (that is, pressure supply passageway 145 is opened), and will be in discharge room 142 Refrigerant (discharge gas) supply to the pressure supply passageway 145a between control valve 300 and switching valve 350 so that Pc ' rise, So as to make an end face 352a1 of the first valve portion 352a far from the first valve seat 353b, and make an end face of the second valve portion 352b 352b1 is abutted with the second valve seat 151a2.

In addition, for keeping an end face 352b1 of the second valve portion 352b to abut with the second valve seat 151a2 and the first valve portion The other end 352a2 of 352a is following mathematical expressions (4) with the condition of an end face 351b2 of the zoning wall 351b state abutted.

Pc ' S3+F2 > Ps (S3-S2)+PcS2 ... (4)

Here, F2 is to act on the one of the first valve portion 352a due to the refrigerant stream impact from the side first port 353a Power caused by the dynamic pressure of end face 352a1.

But due to S3=S2, (Pc '-Pc) S2+F2 > 0 ... (4 ')

If pressure supply passageway 145 is opened, even refrigerant flows in pressure supply passageway 145, then Pc ' > Pc, because This, under the action of the power generated by static pressure difference (Pc '-Pc) and the power F2 generated by dynamic pressure, spool 352 remains the second valve Second valve seat 151a2 is abutted the state of (pressing) by an end face 352b1 of portion 352b.

As long as in addition, for making an end face 352b1 of the second valve portion 352b far from the condition of the second valve seat 151a2 by mathematics The left side of formula (4 ') is set as negative.

When control valve 300 is closed (i.e., closing pressure supply passageway 145), the refrigerant in discharge room 142 (is spat Gas out) it is not supplied to the pressure supply passageway 145a between control valve 300 and switching valve 350, therefore, F2=0.This Outside, the refrigerant in pressure supply passageway 145a flows out (discharge) to suction chamber 141 via throttle passage 320, therefore Pc ' < Pc.As a result, the left side of mathematical expression (4 ') is negative, an end face 352b1 of the second valve portion 352b far from the second valve seat 151a2, And an end face 352a1 of the first valve portion 352a is abutted with the first valve seat 353b.

Thus, control valve is closed in the state that the end face 352b1 with the second valve portion 352b is abutted with the second valve seat 151a2 300 with by pressure supply passageway 145 close when, for making an end face 352b1 of the second valve portion 352b far from the second valve seat 151a2 Condition be following mathematical expressions (5).

PcS2+F3 > Pc ' S2+f ... (5)

(Pc-Pc ') S2+F3 > f ... (5 ')

Here, F3 is acted on due to the refrigerant impact of adverse current in internal path 352d (the first access 352d1) Power caused by the dynamic pressure of the end face of first access 352d1.

Refrigerant in pressure supply passageway 145a flow to 141, Pc ' < Pc of suction chamber via throttle passage 320.In addition, It is produced in the power generated by static pressure difference (Pc-Pc ') and by the refrigerant of adverse current in internal path 352d (the first access 352d1) Under the action of power F3 caused by raw dynamic pressure, an end face 352b1 of the second valve portion 352b is far from the second valve seat 151a2, and first One end face 352a1 of valve portion is abutted with the first valve seat 353b.

In this way, switching valve 350 utilizes and acts on the first valve portion when control valve 300 opens pressure supply passageway 145 It is mobile that the rising of the pressure Pc ' of the side first port 353a of mono- end face 352a1 of 352a makes spool 352, and makes the second valve portion 352b An end face 352b1 abutted with the second valve seat 151a2.Connection between second port 151a1 and third port 351a1 as a result, It is truncated, and first port 353a is connected to second port 151a1 via internal path 352d.As a result, switching valve The first discharge access 146a between 350 and crank chamber 140 switches to pressure supply passageway 145b.

In addition, switching valve 350 utilizes and acts on the first valve portion when control valve 300 closes pressure supply passageway 145 It is mobile that the decline of the pressure Pc ' of the side first port 353a of mono- end face 352a1 of 352a makes spool 352, and makes the first valve portion 352a An end face 352a1 abutted with the first valve seat 353b.First port 353a is closed as a result, and second port 151a1 and Three port 351a1 connection.As a result, the pressure supply passageway 145b between switching valve 350 and crank chamber 140 switches to first Discharge access 146a.In addition, each compression area S1, S2, S3 of spool 352 can be fitted according to the smoothly movement of spool 352 Work as adjusting.

" setting of switching valve 350 "

Binding face (hereinafter referred to as " open the end face ") 104g opposite with cylinder body 101 of valve assembly 350a from cylinder cap 104 Side is set to the second accepting hole 104d.Specifically, the second accepting hole 104d is formed as in the opening end face of cylinder cap 104 The side 104g (101 side of cylinder body) has the columned hole of opening (referring to Fig. 5).Communication path 104e's is open at one end in The bottom wall 104d1 of two accepting hole 104d.In addition, valve assembly 350a is so that the receiving of an end face 351a2 of valve shell 351 and second The mode that the bottom wall 104d1 of hole 104d is faced, in other words, so that the first valve seat forming portion 353 is towards the second accepting hole 104d's The mode of bottom wall 104d1 is set to the second accepting hole 104d, and the outer peripheral surface of valve shell 351 is embedded in the interior of the second accepting hole 104d Peripheral wall 104d2.

Switching valve 350 is configured at the axis than drive shaft 110 and more leans on the region on the downside of gravity direction (referring to Fig.1).Specifically For, in the opening end face side 104g of cylinder cap 104 there is the second accepting hole 104d of opening the opening than cylinder cap 104 is arranged in At position of the end face 104g far from cylinder body 101, and it is opened on suction chamber 141 (inner wall).In valve assembly 350a, valve shell The above-mentioned one end (353 side of the first valve seat forming portion) of 351 peripheral wall 351a is pressed into and is embedded in the second accepting hole 104d Internal perisporium 104d2, the above-mentioned another side of the peripheral wall 351a of valve shell 351 is projected into suction chamber 141, so that third port 351a1 is located in suction chamber 141.

In addition, valve assembly 350a is oriented to make the face of the above-mentioned another side of valve shell 351 in cylinder cap 104 351a3 is abutted with the second valve seat forming portion 151a (discharge valve forms plate 151).Hereinafter, determining referring to Fig. 7 valve assembly 350a Position method is illustrated.

Firstly, being advised with the face 351a3 of the above-mentioned another side of valve shell 351 from the opening end face 104g of cylinder cap 104 is prominent Valve assembly 350a is temporarily pressed into the second accepting hole 104d by the mode of quantitative h.

Then, above-mentioned compressor main body is assembled.That is, front casing 102, cylinder body 101, inlet valve are formed plate 150, valve plate 103, discharge valve forms plate 151, cylinder cap 104 etc. and is sequentially connected.As a result, outside the opening end face 104g valve outstanding of cylinder cap 104 The face 351a3 of the above-mentioned other end of shell 351 is abutted with the second valve seat forming portion 151a (discharge valve forms plate 151).

Then, above-mentioned compressor main body is fastened through bolt 105 by multiple, to form variable displacement compressor 100. It is as a result, pressed into the depth side of valve assembly 350a towards the second accepting hole 104d, in the above-mentioned another side of valve shell 351 In the state that face 351a3 is abutted with the second valve seat forming portion 151a (discharge valve forms plate 151), furthermore, it is understood that in valve shell The state that the face 351a3 of 351 above-mentioned another side presses the second valve seat forming portion 151a (discharge valve forms plate 151) Under, valve assembly 350a is positioned.

If in this way, valve shell can be made while assembling above-mentioned compressor main body (or variable displacement compressor 100) Between 351 outer peripheral surface and the internal perisporium 104d2 of the second accepting hole 104d and face of the above-mentioned another side of valve shell 351 It is sealed between 351a3 and the second valve seat forming portion 151a, it is therefore not necessary to which containment member etc. is separately arranged, structure is simplified.

" movement of variable displacement compressor 100 "

Fig. 8 shows the states that variable displacement compressor 100 lower the engine stop of vehicle the case where etc. stops.Above-mentioned Under state, energization of the control valve 300 to molded coil 314 is cut off, control valve 300 opens pressure supply passageway 145 to maximum (passage sections product is set as maximum), and throttle passage 320 is closed.Switching valve 350 becomes following state, i.e. the second valve portion An end face 352b1 and the second valve seat 151a2 of 352b is abutted with by the company between second port 151a1 and third port 351a1 Logical truncation, and first port 353a is connected to second port 151a1 via internal path 352d.Thus, 140 He of crank chamber Suction chamber 141 is connected to by only the second discharge access 146b, the above-mentioned discharge access for being connected to crank chamber 140 with suction chamber 141 Aperture (passage sections product) it is minimum.

When the engine start of vehicle in the above-described state is spat when the drive shaft 110 of variable displacement compressor 100 rotates Check-valves 200 will spue path blockade out, in addition, throttle passage 320 is closed, therefore, the refrigerant to be spued by compression (spues Refrigerant in room 142) all supply via pressure supply passageway 145 to crank chamber 140.Thus, the pressure of crank chamber 140 can Rise by ground, the inclination angle of inclined plate 111 is minimum, and the stroke (discharge capacity) of piston 136 is minimum.At this point, variable displacement compressor 100 As the state operated with non-action status.In addition, the refrigerant that above-mentioned compression spues includes oil, and by discharge room 142, pressure The inside circulation that power supply passageway 145, crank chamber 140, the second discharge access 146b, suction chamber 141 and cylinder bore 101a are constituted It recycles in path, is lubricated with the inside to variable displacement compressor 100.

Then, when above-mentioned air regulator acts, electric current flows through in the molded coil 314 of control valve 300, so that valve Core 304 closes valve opening 301c, while throttle passage 320 is opened.At this point, the refrigerant that above-mentioned compression spues is not supplied with to control Pressure supply passageway 145a between valve 300 processed and switching valve 350.In addition, refrigerant in pressure supply passageway 145a via Throttle passage 320 flows out to suction chamber 141.As a result, the pressure of pressure supply passageway 145a is identical as suction chamber 141.? In switching valve 350 at this time, refrigerant is from the side second port 151a1 via internal path 352d (the first access 352d1) to One valve chamber 351c adverse current, and by above-mentioned internal path 352d (the first access 352d1) the refrigerant generation of adverse current make valve The dynamic pressure mobile to the first valve seat 353b of core 352.

Thus, difference (static pressure of the spool 352 in the pressure of pressure and the side first port 353a by the side second port 151a1 Difference) power caused by the power that generates and the dynamic pressure generated as the refrigerant of the adverse current in internal path 352d under the action of, towards the One side valve seat 353b is mobile, and an end face 352a1 and the first valve seat 353b of the first valve portion 352a is abutted with by first port 353a It closes, and is connected to second port 151a1 with third port 351a1.That is, switching valve 350 switches pressure supply passageway 145b To the first discharge access 146a.As a result, crank chamber 140 and suction chamber 141 are released by the first discharge access 146a and second It presses access 146b and is connected to, the aperture (passage sections product) for the above-mentioned discharge access for being connected to crank chamber 140 with suction chamber 141 is Maximum (referring to Fig. 9).

Thus, the refrigerant in crank chamber 140 promptly flows out (discharge) to suction chamber 141, the pressure of crank chamber 140 with The pressure of suction chamber 141 is identical.Thus, the inclination angle of inclined plate 111 becomes maximum, and the stroke (that is, discharge capacity) of piston 136 becomes It is maximum.In addition, discharge check-valves 200 is opened, above-mentioned refrigerant recycles in above-mentioned air conditioner system, above-mentioned air conditioning Device system becomes action state.Here, liquid refrigerant is in inside in the case where liquid refrigerant storage stays in crank chamber 140 It is flowed in access 352d.At this point, the density of refrigerant significantly becomes larger compared with gaseous state, so that above-mentioned dynamic pressure increases, thus It can more reliably make spool 352 mobile towards the direction of the first valve seat 353b.

Then, when the pressure of suction chamber 141 is dropped to by the setting pressure for the electric current setting flowed in molded coil 314 When, the spool 304 of control valve 300 opens valve opening 301c, and the refrigerant that above-mentioned compression spues as a result, is supplied to control valve Pressure supply passageway 145a between 300 and switching valve 350, and the pressure of pressure supply passageway 145a is made to increase.Make as a result, The pressure of the side first port 353a for spool 352 is greater than the suction chamber for acting on the side above-mentioned first port 353a opposite side One end face 352a1 of 141 pressure, the first valve portion 352a leaves from the first valve seat 353b, and one end of the second valve portion 352b Face 352b1 is abutted with the second valve seat 151a2.It is supplied that is, the first discharge access 146a is switched to pressure by switching valve 350 Access 145b.Therefore, crank chamber 140 is connected to suction chamber 141 by only the second discharge access 146b, is made crank chamber 140 and is inhaled Enter the room 141 connections discharge access aperture (passage sections product) it is minimum (referring to Fig.1 0).Thus, it is pressed according to 300 Duis of control valve The adjusting that the aperture (passage sections product) of power supply passageway 145 carries out, so that the pressure in crank chamber 140 rises, inclined plate 111 Inclination angle reduces, and the stroke (discharge capacity) of piston 136 reduces, to be in discharge volume controlled state.

As described above, in the present embodiment, switching valve 350 is in control valve 300 by pressure supply passageway 145 When closing, the pressure supply passageway 145b between switching valve 350 and crank chamber 140 is cut from the state being connected to discharge room 142 Shift to the state (that is, first discharge access 146a) being connected to suction chamber 141.As a result, prevent refrigerant from 140 side of crank chamber to The adverse current of control valve 300, in addition, when the aperture (passage sections product) of above-mentioned discharge access is opened than pressure supply passageway 145 more (maximum) greatly.That is, switching valve 350 has the function and prevention controlled from the discharge of crank chamber 140 refrigerant Refrigerant is from crank chamber 149 to the function of 300 adverse current of control valve.It is therefore not necessary to dedicated check-valves be arranged, thus variable capacity Layout in compressor becomes easy.

In addition, switching valve 350 control valve 300 by pressure supply passageway close when, not merely with the side second port 151a1 Pressure and the side first port 353a pressure difference (static pressure difference) caused by power, also utilize by from the side second port 151a1 Power caused by the dynamic pressure generated via internal path 352d to the flowing of the refrigerant of the first valve chamber 351c, moves spool 352 It is dynamic.Thus, it can promptly carry out the switching from pressure supply passageway 145a to the first discharge access 146a.In particular, working as variable capacity When capacity compressor 100 is activated with the state that liquid refrigerant is stored in crank chamber 140, switching valve 350 is quickly and reliably Movement, is promptly expelled to suction chamber 141 for the liquid refrigerant in crank chamber 140.

" second embodiment "

Figure 11 is the cross-sectional view for indicating the structure of switching valve 350B of second embodiment.In the second accepting hole 104d and company In the case that path 104e is almost coaxially formed, the bottom wall 104d1 that above-mentioned switching valve can be configured to the second accepting hole 104d is risen To the effect of above-mentioned first valve seat forming portion.At this point, valve assembly 350a is made of valve shell 351 and spool 352, the second receiving The opening of the communication path 104e of the bottom wall 104d1 of hole 104d is above-mentioned first port, the bottom wall 104d1 of the second accepting hole 104d Communication path 104e opening around become for the first valve portion 352a an end face 352a1 contact, separate above-mentioned first valve Seat.In this way, without the need for the special-purpose member of above-mentioned first valve seat forming portion, so as to simplify the structure of valve assembly 350a.

" third embodiment "

Figure 12 is the cross-sectional view for indicating the structure of switching valve 350C of third embodiment.In the second accepting hole 104d and company In the case that path 104e is almost coaxially formed, above-mentioned switching valve is configured to make the bottom wall 104d1 of the second accepting hole 104d to rise It works to above-mentioned first valve seat forming portion, and the inside for being formed as the peripheral wall 351a of valve shell 351 constitutes only the second valve chamber 351d.In this case, in the same manner as above-mentioned second embodiment, valve assembly is constituted by valve shell 351 and spool 352 350a.In addition, the second accepting hole 104d be formed as example from the opening end face side 104g of cylinder cap 104 (101 side of cylinder body) according to It is secondary that there is the major diameter hole portion 104d21 and path hole portion 104d22 than major diameter hole portion 104d21 path.In addition, being configured to make outside valve The outer peripheral surface of the peripheral wall 351a of shell 351 is pressed into the inner peripheral surface being fitted into major diameter hole portion 104d21, and makes the first valve portion 352a Outer peripheral surface gap as defined in separate in a manner of be supported on the inner peripheral surface of path hole portion 104d22.In this way, also with above-mentioned second Embodiment similarly, without the need for the special-purpose member of above-mentioned first valve seat forming portion, thus the structure letter of valve assembly 350a Change.

" the 4th embodiment "

Figure 13 is the cross-sectional view for indicating the structure of switching valve 350D of the 4th embodiment.By valve shell 351, spool 352 And first valve seat forming portion 353 constitute valve assembly 350a be configured to assembly and disassembly in the second accepting hole 104d.At this point, as schemed Shown in 13, it may be desirable to, match between the internal perisporium 104d2 of the peripheral wall 351a and the second accepting hole 104d of valve shell 351 It is equipped with the flexible containment member 160 such as O-ring.

More preferably, between the bottom wall 104d1 of the second accepting hole 104d and an end face 351a2 of valve shell 351 Configured with biasing member 170.Biasing member 170 is with the face 351a3 of the above-mentioned another side of valve shell 351 via the second valve seat shape Valve assembly 350a is exerted a force towards the second valve seat forming portion 151a at the mode that portion 151a presses valve plate 103.Force Component 170 is simultaneously not particularly restricted, but may be wave washer, disc spring and/or helical spring etc..

Biasing member 170 is formed as, when valve assembly 350a enters the second accepting hole 104d, by making valve shell The face 352a3 of 351 above-mentioned another side makes the upper of valve shell 351 from the prominent specified amount h ' of the opening end face 104g of cylinder cap 104 The face 352a3 for stating another side is pressed, so as to make the face 352a3 of above-mentioned another side of valve shell 351 be moved to cylinder cap 104 opening end face 104g.In addition, the valve assembly 350a for entering the second accepting hole 104d is forming above-mentioned compressor main body When, specifically realizing that the face 352a3 of the above-mentioned another side of valve shell 351 is pressed when fastening through bolt 105 by multiple It presses and is pressed into the depth side of the second accepting hole 104d.Valve assembly 350a is set in the second accepting hole 104d as a result, At position appropriate, via the second valve seat forming portion 151a, (discharge valve is formed the face 351a3 of the above-mentioned other end of valve shell 351 Plate 151) valve plate 103 is pressed.

Valve assembly 350a when entering the second accepting hole 104d, the peripheral wall portion 351a that is configured at valve shell 351 with Second is maintained under the action of the elastic forces of containment members 160 such as the O-ring between the internal perisporium 104d2 of the second accepting hole 104d In accepting hole 104d.Thus, in the case where the opening end face 104g of cylinder cap 104 is towards on the downside of gravity direction, valve assembly 350a and biasing member 170 will not fall off from the second accepting hole 104d, and the assemblability of variable displacement compressor 100 will not be by Damage.

" the 5th embodiment "

Figure 14 is the cross-sectional view for indicating the structure of switching valve 350E of the 5th embodiment.Be fixed on valve shell 351 First valve seat forming portion 353 of above-mentioned one end is it is equally possible that be fixed on valve shell 351 for the second valve seat forming portion 354 Peripheral wall 351a above-mentioned another side.At this point, the second accepting hole 104d is for example formed in the opening end face 104g of cylinder cap 104, And be configured to the inside of the second accepting hole 104d and suction chamber 141 is opened by zoning, the second accepting hole 104d and suction chamber 141 via Communication path 104h connection.

It is close configured with O-ring etc. between the internal perisporium 104d2 of the peripheral wall 351a and the second accepting hole 104d of valve shell 351 Seal component 160,161.Containment member 160 will be via the internal perisporium of the peripheral wall 351a of valve shell 351 and the second accepting hole 104d Connection truncation between the pressure supply passageway 145a and suction chamber 141 in the gap between 104d2, containment member 161 will be via The pressure supply passageway 145b in the gap between the peripheral wall 351a of valve shell 351 and the internal perisporium 104d2 of the second accepting hole 104d Connection truncation between suction chamber 141.In addition, valve assembly 350a is under the action of the elastic force of containment member 160,161 It is maintained in the second accepting hole 104d.

" sixth embodiment "

Figure 15 is the cross-sectional view for indicating the structure of switching valve 350F of sixth embodiment.(a) of Figure 15 is indicated to crank (b) of the pressure supply state that room 140 supplies, Figure 15 indicates the relief state discharged from crank chamber 140.Sixth embodiment Switching valve 350F is not configured in cylinder cap 104, and the axis being arranged in than the drive shaft 110 in cylinder body 101 more leans on gravity At position on the downside of direction.

Switching valve 350F includes that third accepting hole 101f, annular component 355, spool 352 and inlet valve form plate 150, In, above-mentioned third accepting hole 101f is formed in cylinder body 101.

Third accepting hole 101f is formed in the face (binding face opposite with cylinder cap 104) of the above-mentioned another side of cylinder body 101 101g.Third accepting hole 101f is formed as circular hole with the level with the end, comprising: major diameter hole portion 101f1, above-mentioned major diameter hole portion 101f1 is opened on the face 101g of the above-mentioned another side of cylinder body 101；And path hole portion 101f2, above-mentioned path hole portion 101f2 Diameter it is smaller than the diameter of major diameter hole portion 101f1.In addition, the opening of the major diameter hole portion 101f1 of third accepting hole 101f is inhaled into Valve forms plate 150 and blocks.

Annular component 355 is installed on the major diameter hole portion 101f1 of third accepting hole 101f.Annular component 355 accommodates third Hole 101f inner region divides the first valve chamber 101f3 and the second valve chamber 101f4 into.First valve chamber 101f3 by major diameter hole portion 101f1 inner circumferential Wall, annular component 355 and inlet valve form plate 150 and surround, internal perisporium of the second valve chamber 101f4 by path hole portion 101f2, ring-type The bottom wall 101f5 of component 355 and third accepting hole 101f are surrounded.That is, annular component 355 is equivalent to the area of above-mentioned valve shell 351 Draw wall 351b.

Spool 352 similarly to the first embodiment, has the first valve portion 352a, the second valve portion 352b, axle portion 352c and internal path 352d (352d1,352d2,352d3), above-mentioned axle portion 352c are by the first valve portion 352a and the second valve portion 352b connection.In addition, the first valve portion 352a, which is contained in the first valve chamber 101f3, the second valve portion 352b, is contained in the second valve chamber 101f4, axle portion 352c are inserted through hole portion (insertion hole) 355a of annular component 355.

In the region (envelope that the opening of the major diameter hole portion 101f1 for the third accepting hole 101f that inlet valve is formed to plate 150 blocks Closing part) 150a, in other words the first valve chamber 101f3 wall portion, be formed with first port 150a1 and the first valve seat 150a2.First end Mouthful 150a1, which is formed through, forms plate 150 in inlet valve, is opened on the first valve chamber 101f3, and with control valve 300 and switching valve Pressure supply passageway 145a connection between 350.First valve seat 150a2 is formed in the closure 150a that inlet valve forms plate 150 In first port 150a1 around.In addition, an end face 352a1 and the first valve seat of the first valve portion 352a by making spool 352 150a2 is contacted, is separate, so that first port 150a1 be opened, closed.That is, in the present embodiment, inlet valve forms plate 150 (closure part 150a) is used as above-mentioned first valve seat forming portion.But is not limited thereto, can also be by valve plate 103, cylinder pad Circle 152 or discharge valve form plate 151 etc. and are configured at plate between cylinder body 101 and cylinder cap 104, other than inlet valve formation plate 150 Shape component is used as above-mentioned first valve seat forming portion.

Composition makes the one of crank chamber 140 and third accepting hole 101f (the second valve chamber 101f4) the communication path 101c ' being connected to The second port 101f5a at end is opened on the bottom 101f5 of third accepting hole 101f, is in other words opened on the second valve chamber 101f4's Wall portion.In addition, being formed with the second valve seat around the second port 101f5a of the bottom wall 101f5 of third accepting hole 101f 101f5b.In addition, an end face 352b1 of the second valve portion 352b by making spool 352 is contacted with the second valve seat 101f5b, is remote From so that second port 101f5a be opened, closed.That is, in the present embodiment, the bottom wall 101f5 of third accepting hole 101f With the function as above-mentioned second valve seat forming portion.

In addition, constituting the communication path for being connected to suction chamber 141 with third accepting hole 101f (the second valve chamber 101f4) The third port 101f2a of one end of 104h ' is opened on internal perisporium, i.e. second of the path hole portion 101f2 of third accepting hole 101f Other wall portions of valve chamber 101f4.

In the present embodiment, spool 352 and annular component 355 are configured at third as valve assembly 350a ' and accommodate Hole 101f.The assembling of valve assembly 350a ' and setting from valve assembly 350a ' to third accepting hole 101f in the following manner into Row.It is integrally formed by the first valve portion 352a and axle portion 352c of spool 352 in addition, in the present embodiment, and by axle portion 352c is pressed into the through-hole (press-in hole) for the second valve portion 352b for being formed in spool 352, to form spool 352.

Firstly, in the state that the axle portion 352c of spool 352 is inserted through hole portion (insertion hole) 355a of annular component 355, Axle portion 352c is temporarily pressed into the above-mentioned through-hole of the second valve portion 352b, to form valve assembly 350a '.Interim indentation state Valve assembly 352a ' is formed as follows, i.e., when being contained in third accepting hole 101f, in annular component 355 and large diameter hole The interconnecting piece (layer difference face) of portion 101f1 and path hole portion 101f2 abuts, and an end face 352b1 and second of the second valve portion 352b In the state that valve seat 101f5b is abutted, in the other end 352a2 of the first valve portion 352a2 and an end face of annular component 355 There is defined gap between 355b1.

Then, axle portion 352c is adjusted relative to the pushed position of the above-mentioned through-hole of the second valve portion 352b as follows Section, i.e., be contained in third accepting hole 101f for the valve assembly 350a ' of above-mentioned interim indentation state, and make the second valve portion 352b An end face 352b1 abutted with the second valve seat 101f5b in the state of, the other end 352a2 of the first valve portion 352a and cyclic annular structure One end face 355b1 of part 355 is abutted.

As a result, when an end face 352b1 of the second valve portion 352b is abutted with the second valve seat 101f5b, the first valve portion 352a's Other end 352a2 is abutted with an end face 355b1 of annular component 355, will be via the hole portion of annular component 355 (insertion hole) Connection truncation between the first valve chamber 101f3 and the second valve chamber 101f4 of 355a.

When control valve 300 opens pressure supply passageway 145, switching valve 350F is utilized and is acted on the first valve portion 352a's The rising of the pressure Pc ' of the side first port 150a1 of one end face 352a1 is mobile to make spool 352, and makes the second valve portion 352b's One end face 352b1 is abutted with the second valve seat 101f5b.Connection between second port 101f5a and third port 101f2a as a result, It is truncated, and first port 150a1 is connected to second port 101f5a via internal path 352d.As a result, switching The first discharge access 146a between valve 350F (second port 101f5a) and crank chamber 140 is switched to pressure supply passageway 145b。

In addition, switching valve 350F is utilized and is acted on the first valve portion when control valve 300 closes pressure supply passageway 145 The decline of the pressure Pc ' of the first port side of an end face 352a1 of 352a is mobile to make spool 352, and makes the first valve portion 352a An end face 352a1 abutted with the first valve seat 150a2.First port 150a1 is closed as a result, and second port 101f5a It is connected to third port 101f2a.As a result, the pressure between switching valve 350F (second port 101f5a) and crank chamber 140 Supply passageway 145b is switched to the first discharge access 146a.

In addition, when an end face 352b1 of the second valve portion 352b is abutted with the second valve seat 101f5b, the first valve portion 352a's Other end 352a2 is abutted with an end face 355b1 of annular component 355, therefore, from the first valve chamber 101f3 to the second valve chamber The flowing via insertion hole 355a of 101f4 is truncated.

More than, although embodiments of the present invention are illustrated, it is not limited to the above embodiment by the present invention, Various modifications and change can be carried out based on the technical idea of the invention.Several variations therein are recorded below.

Also it is configured to, in above-mentioned switching valve, is formed with slot or throttling in an end face 352b1 of the second valve portion 352b Access etc., when an end face 352b1 of the second valve portion 352b is abutted with above-mentioned second valve seat, above-mentioned second port and above-mentioned third Port is not completely interrupted.In addition it is also possible to be configured to support in an end face 352a of the first valve portion 352a with above-mentioned first valve seat Allow leakage slightly when connecing.In addition it is also possible to be configured to the other end 352a2 and valve shell 351 in the first valve portion 352a Zoning wall 351b or the above-mentioned end face of annular component 355 when abutting, allow from above-mentioned first valve chamber to above-mentioned second valve chamber Flowing slightly.

In above-mentioned switching valve, the peripheral wall 351a and zoning wall of valve shell 351 can also be made of different components 351b.At this point, above-mentioned first valve seat forming portion or above-mentioned second valve seat forming portion can be integrally formed at peripheral wall 351a.

Throttle passage 320 is also configured to not via in control valve 300, and is made between control valve 300 and switching valve 350 Pressure supply passageway 145a be connected to suction chamber 141.For example, throttle passage 320 is also configured to via above-mentioned switching valve Inside, and in the other end 352a2 of the first valve portion 352a and the zoning wall 351b of valve shell 351 or annular component 355 An above-mentioned end face abut when be formed with throttle.

Control valve 300 is also possible to do not have the pressure-sensitive structures such as bellows either without solenoidal mechanical control valve The solenoid valve of part.

Variable displacement compressor is not limited to the clutchless type compressor of ramp type, can also use and be equipped with electromagnetism The variable displacement compressor of clutch or the variable displacement compressor driven by motor.

(symbol description)

100 variable displacement compressors；101 cylinder bodies；102 front casings；104 cylinder caps；110 drive shafts；140 crank chambers；104f Second accepting hole；141 suction chambers；142 discharge rooms；145a, 145b pressure supply passageway；146a, 146b discharge access；151 spit Valve forms plate out；151a the second valve seat forming portion；151a1 second port；The second valve seat of 151a2；300 control valves；350 switchings Valve；350a valve assembly；351 valve shells；351a peripheral wall；351a1 third port；351b zoning wall；351b1 insertion hole；351c First valve chamber；The second valve chamber of 351d；352 spools；The first valve portion of 352a；The second valve portion of 352b；352c axle portion；353 first valve seats Forming portion；353a first port；The first valve seat of 353b.

Claims (17)

1. a kind of variable displacement compressor controls discharge capacity by the indoor pressure adjusting of crank, which is characterized in that Include:

Control valve, the control valve are set to pressure supply passageway, and the pressure supply passageway is connected to discharge room with crank chamber；

Switching valve, the switching valve are configured at the axis than drive shaft and more lean at the position on the downside of gravity direction, and are set to described Control valve described in ratio in pressure supply passageway more leans at the position of the crank chamber side, and has and be connected to suction chamber Interconnecting part；And

Throttle passage, the throttle passage make pressure supply passageway and the sucking between the control valve and the switching valve Room connection,

The switching valve is configured to when the control valve closes the pressure supply passageway, by the control valve and described cuts The connection for changing the pressure supply passageway between valve and the pressure supply passageway between the switching valve and the crank chamber is cut Break, and makes the pressure supply passageway and the sucking between the switching valve and the crank chamber via the interconnecting part Room connection.

2. variable displacement compressor as described in claim 1, which is characterized in that

The switching valve is by making the switching valve and the crank when the control valve closes the pressure supply passageway The pressure supply passageway between room is connected to the suction chamber, to beat the pressure supply passageway with the control valve It is compared when opening, increases the passage sections product for the discharge access that the crank chamber is connected to the suction chamber.

3. variable displacement compressor as claimed in claim 1 or 2, which is characterized in that

The switching valve includes:

First valve chamber, first valve chamber have first port and the first valve seat, the first port and the control valve and institute The pressure supply passageway connection between switching valve is stated, first valve seat is set to around the first port；

Second valve chamber, second valve chamber have second port, the second valve seat and third port, and the second port is cut with described The pressure supply passageway connection between valve and the crank chamber is changed, second valve seat is set to around the second port, The third port is connected to the suction chamber；And

Spool, the spool have the first valve portion, the second valve portion and internal path, and first valve portion is configured at first valve Room simultaneously contacts with first valve seat, is separate, and second valve portion is configured at second valve chamber and connects with second valve seat Touching, the separate, internal path make the second port and described the when second valve portion is abutted with second valve seat The connection of one valve chamber,

The switching valve is constituted are as follows: when the control valve closes the pressure supply passageway, utilizes the first port side Pressure decline and from the second port side via refrigerant from the internal path to first valve chamber flowing Generated dynamic pressure abuts first valve portion with first valve seat, the first port is closed, and makes described Second valve portion far from second valve seat so that the second port is connected to the third port, thus by the control valve and The pressure supply passageway between the switching valve and the supply of the pressure between the switching valve and the crank chamber are logical Connection truncation between road, and make the pressure supply passageway and the sucking between the switching valve and the crank chamber The passage sections product for the discharge access for being connected to the crank chamber with the suction chamber is set as maximum by room connection,

And when the control valve opens the pressure supply passageway, the rising using the pressure of the first port side makes First valve portion, to open the first port, and makes the first port and the second end far from first valve seat Mouth is connected to via the internal path, and abuts second valve portion with second valve seat, by the second end Connection truncation mouthful between the third port is set as close to truncation, thus make the control valve and the switching valve it Between the pressure supply passageway be connected to the pressure supply passageway between the switching valve and the crank chamber, and will The passage sections product of the discharge access is set as minimum.

4. variable displacement compressor as claimed in claim 3, which is characterized in that

First valve chamber and second valve chamber by zoning wall zoning,

The spool has axle portion, and the axle portion links first valve portion and second valve portion, and is inserted into and to be formed In the insertion hole of the zoning wall, and it is configured to when second valve portion is abutted with second valve seat, first valve Portion is abutted with the zoning wall the connection via the insertion hole of first valve chamber and second valve chamber to be truncated.

5. variable displacement compressor as claimed in claim 4, which is characterized in that

The switching valve includes:

Valve shell, the valve shell have peripheral wall and the zoning wall, and the peripheral wall has the inside for constituting second valve chamber Space, and it is formed with the third port；

First valve seat forming portion, the first valve seat forming portion are formed with the first port and first valve seat, and with institute It states valve shell and is formed together first valve chamber；And

Second valve seat forming portion, the second valve seat forming portion are formed with the second port and second valve seat, and with institute It states valve shell and is formed together second valve chamber,

The valve shell and the spool are configured to valve assembly, and first valve portion of the spool and second valve Portion is formed by seperated component, and the axial relative position of first valve portion and second valve portion can be adjusted.

6. variable displacement compressor as claimed in claim 4, which is characterized in that

The switching valve includes:

Valve shell, the valve shell have peripheral wall and a zoning wall, and the peripheral wall, which has, constitutes first valve chamber and described The inner space of second valve chamber, and it is formed with the third port；

First valve seat forming portion, the first valve seat forming portion are formed with the first port and first valve seat, and with institute It states valve shell and is formed together first valve chamber；And

Second valve seat forming portion, the second valve seat forming portion are formed with the second port and second valve seat, and with institute It states valve shell and is formed together second valve chamber,

The valve shell, the spool and the first valve seat forming portion are configured to valve assembly, and described the first of the spool Valve portion and second valve portion are formed by seperated component, and the spool is configured to first valve portion and described second The axial relative position of valve portion is adjusted.

7. variable displacement compressor as claimed in claim 6, which is characterized in that

The first valve seat forming portion is integrally formed at the valve shell.

8. the variable displacement compressor as described in any one of claims 1 to 7, which is characterized in that

The shaft is supported on compressor main body in a manner of revolvable, and the compressor main body includes: cylinder body；Front casing, institute Front casing is stated set on the one end of the cylinder body and is cooperated with the cylinder body to form the crank chamber；And cylinder cap, the cylinder It is covered on the another side of the cylinder body, and zoning is formed with the suction chamber and the discharge room,

The control valve and the switching valve are configured at the cylinder cap.

9. variable displacement compressor as claimed in claim 5, which is characterized in that

The shaft is supported on compressor main body in a manner of revolvable, and the compressor main body includes: cylinder body；Front casing, institute Front casing is stated set on the one end of the cylinder body and is cooperated with the cylinder body to form the crank chamber；And cylinder cap, the cylinder It is covered on the another side of the cylinder body, and zoning is formed with the suction chamber and the discharge room,

The valve assembly of the valve shell and the spool is configured at accepting hole, and the accepting hole is logical to constitute the pressure supply The mode of a part on road is formed in the cylinder cap,

The accepting hole, which is formed as in the cylinder cap, opposite with cylinder body binding face side, has opening, and described The bottom wall of accepting hole plays the role of the first valve seat forming portion, the plate structure being configured between the cylinder body and the cylinder cap Part is used as the second valve seat forming portion.

10. variable displacement compressor as claimed in claims 6 or 7, which is characterized in that

The shaft is supported on compressor main body in a manner of revolvable, and the compressor main body includes: cylinder body；Front casing, institute Front casing is stated set on the one end of the cylinder body and is cooperated with the cylinder body to form the crank chamber；And cylinder cap, the cylinder It is covered on the another side of the cylinder body, and zoning is formed with the suction chamber and the discharge room,

The valve assembly of the valve shell, the spool and the first valve seat forming portion is configured at accepting hole, the receiving Hole is formed in the cylinder cap in a manner of constituting a part of the pressure supply passageway,

The accepting hole the binding face side opposite with the cylinder body of the cylinder cap have opening, the valve assembly so that The mode of bottom wall of the first valve seat forming portion towards the accepting hole is configured at the accepting hole, be configured at the cylinder body with Tabular component between the cylinder cap is used as the second valve seat forming portion.

11. variable displacement compressor as claimed in claim 10 characterized by comprising

Biasing member, the biasing member are configured between the bottom wall of the accepting hole and the valve assembly, and by institute Valve assembly is stated to exert a force to the second valve seat forming portion；And

Containment member, the containment member are configured between the assembly and the internal perisporium of the accepting hole, and have elasticity.

12. the variable displacement compressor as described in any one of claim 9 to 11, which is characterized in that

The suction chamber is formed in the cylinder cap,

The accepting hole is opened on the suction chamber,

The valve assembly by make the third port be located at it is described sucking it is indoor in a manner of be configured at the accepting hole.

13. variable displacement compressor as claimed in claim 4, which is characterized in that

The switching valve includes:

First valve seat forming portion, the first valve seat forming portion are formed with the first port and first valve seat, and with institute It states zoning wall and is formed together first valve chamber；And

Second valve seat forming portion, the second valve seat forming portion are formed with the second port and second valve seat, and with institute It states zoning wall and is formed together second valve chamber,

The zoning wall and the spool are configured to valve assembly, first valve portion and second valve portion of the spool by Seperated component is formed, and the spool is configured to the axial relative position to first valve portion and second valve portion It is adjusted.

14. the variable displacement compressor as described in any one of Claims 1-4,13, which is characterized in that

The shaft is supported on compressor main body in a manner of revolvable, and the compressor main body includes: cylinder body；Front casing, institute Front casing is stated set on the one end of the cylinder body and is cooperated with the cylinder body to form the crank chamber；And cylinder cap, the cylinder It is covered on the another side of the cylinder body, and zoning is formed with the suction chamber and the discharge room,

The control valve is configured at the cylinder cap,

The switching valve is configured at the cylinder body.

15. the variable displacement compressor as described in any one of Claims 1-4,13, which is characterized in that

The shaft is supported on compressor main body in a manner of revolvable, and the compressor main body includes: cylinder body；Front casing, institute Front casing is stated set on the one end of the cylinder body and is cooperated with the cylinder body to form the crank chamber；And cylinder cap, the cylinder It is covered on the another side of the cylinder body, and zoning is formed with the suction chamber and the discharge room,

The valve assembly of the zoning wall and the spool is configured at accepting hole, and the accepting hole is logical to constitute the pressure supply The mode of a part on road is formed in the cylinder body,

The accepting hole is formed as having opening, and the accepting hole in the binding face opposite with the cylinder cap of the cylinder body Bottom wall play the role of the second valve seat forming portion, the tabular component being configured between the cylinder body and the cylinder cap is used as The first valve seat forming portion.

16. the variable displacement compressor as described in any one of claims 1 to 15, which is characterized in that

The throttle passage is formed as making the pressure between the control valve and the switching valve via the inside of the control valve Supply passageway is connected to the suction chamber.

17. variable displacement compressor as claimed in claim 16, which is characterized in that

The control valve has valve system, and the valve system is configured to will be described when leading to pressure supply and being opened to maximum Throttle passage is closed.