CN101603605A

CN101603605A - Four-way change-over valve

Info

Publication number: CN101603605A
Application number: CNA2008101255549A
Authority: CN
Inventors: J·李; J·杨; X·施
Original assignee: Carrier Corp
Current assignee: Carrier Corp
Priority date: 2008-06-13
Filing date: 2008-06-13
Publication date: 2009-12-16
Anticipated expiration: 2028-06-13
Also published as: CN101603605B; WO2009152402A3; WO2009152402A2

Abstract

The present invention relates to four-way change-over valve, comprise the valve body that is provided with first port, second port, the 3rd port and the 4th port.Spool comprises first opening that communicates with the first port continuous fluid, second opening that communicates with the second port continuous fluid, the 3rd opening that communicates with a continuous fluid in the 3rd port and the 4th port, the 4th opening that communicates with another continuous fluid in the 3rd port and the 4th port.First passage is limited between second opening and the 3rd opening, be used for providing the fluid communication between second port, the 3rd port and the 4th port one, second channel is limited between first opening and the 4th opening, is used for providing the fluid communication between another of first port, the 3rd port and the 4th port.

Description

Four-way change-over valve

Technical field

The present invention relates generally to a kind of four-way change-over valve, this selector valve comprises the rotatable spool that is provided with two fluid passages.

Background technique

Refrigeration system or heat pump loop can comprise the four-way change-over valve that is used to change by the flow of refrigerant direction of this refrigeration system.For example, when refrigeration agent was mobile along a direction, refrigeration system turned round under refrigerating mode.Then, when refrigeration agent flowed in opposite direction, refrigeration system turned round under heating mode.

A kind of selector valve of prior art defines two fluid passages.A passage is limited at the valve element internal, and another passage is limited at the valve element-external.When the valve element was in primary importance, fluid flow through the system related with this selector valve along first direction.When the valve element was in the second place, fluid flow through this system along second direction.

The selector valve of another kind of prior art comprises the valve element that is provided with four U type grooves.On primary importance, the first cover U type groove defines first flow channel, and on the second place, the second cover U type groove defines second flow channel.Gap between every grooving is less than the width of groove.Every suit U type groove turns over 90 degree with respect to another set of U type groove.The valve element is linear moving between the primary importance and the second place, thereby direct fluid flows through system.When the valve element was in the first position, the first cover U type groove alignd with four short tubes of valve body, makes this system turn round under refrigerating mode.When the spool linearity moved to the second place, the second cover U type groove alignd with four short tubes of valve body, makes this system turn round under heating mode.

The selector valve of another kind of prior art comprises the valve element, and this element comprises two passages of the refrigeration agent directed stream being crossed refrigeration system.This valve element can rotate between the primary importance and the second place.When the valve element was in the first position, first end of first passage alignd with compressor discharge, and second end of first passage aligns with the first heat exchanger mouth.First end and the compressor suction of second channel continue to align, and second end of second channel aligns with the second heat exchanger mouth.When the valve element turned to the second place, second end of first passage alignd with compressor discharge, and first end of first passage aligns with the second heat exchanger mouth.Second end of second channel aligns with first heat exchanger.In rotation process, only there is the compression pump port to keep being communicated with the continuous fluid of passage.Another port temporarily disconnected in rotation process is communicated with the fluid of passage, increases the friction in the rotation process.

The selector valve of the refrigeration system of available technology adopting R22 refrigeration agent has common limited capacity less than 130RT.If the total volume of compressor is worth greater than this, along the pressure drop increase of this selector valve.When power system capacity increased, the pipe diameter of selector valve needed to increase, so as with the pipe diameter coupling of this system.If the pipe diameter of selector valve is big inadequately, then need to adopt ABAP Adapter.Yet, adopt ABAP Adapter will further increase overall pressure drop.

In order to overcome this problem, this system can two or more selector valves of parallel employing.Yet this has increased the complexity of pipeline, and is very expensive and increased owing to selector valve quantity increases the possibility that internal leakage takes place.For example, if a selector valve has the leakage speed of 90l/min under the pressure reduction of 1.0Mpa, if then adopt a plurality of selector valves, internal leakage speed will increase 2 or 3 times.In addition, the possibility that also exists selector valve under different time, to turn round.If this thing happens, then same time selector valve will be on the diverse location.For example, first selector valve can be reduced to pressure reduction zero.If the second selector valve entry into service, because the reduction of pressure reduction, it will stop on the branch road position.If this thing happens, selector valve need be repaired or replace.

Summary of the invention

Selector valve comprises the valve body that is provided with first port, second port, the 3rd port and the 4th port.Spool comprises first opening that communicates with the first port continuous fluid, second opening that communicates with the second port continuous fluid, the 3rd opening that communicates with a continuous fluid in the 3rd port and the 4th port, the 4th opening that communicates with another continuous fluid in the 3rd port and the 4th port.First passage is limited between second opening and the 3rd opening, be used for providing the fluid communication between second port, the 3rd port and the 4th port one, second channel is limited between first opening and the 4th opening, is used for providing the fluid communication between another of first port, the 3rd port and the 4th port.Described spool can rotate between the primary importance and the second place with respect to valve body around rotation axis.When spool is in the first position, the 3rd opening and the 3rd port fluid communication, the 4th opening and the 4th port fluid communication; When spool is in the second place, the 3rd opening and the 4th port fluid communication, the 4th opening and the 3rd port fluid communication.

Another exemplary embodiment comprises refrigeration system, and this system comprises: refrigeration agent is compressed to heat between compressor, exchange system cryogen and a kind of fluid of high pressure first heat exchanger, make refrigeration agent expand into second heat exchanger of heat between expansion gear, exchange system cryogen and the one other fluid of low pressure.Selector valve comprises spool, and described spool comprises the valve body that is provided with the first heat exchanger mouth, the second heat exchanger mouth, compressor suction and compressor discharge.Described spool comprises the valve element, this element comprise with first opening of the first heat exchanger mouth fluid communication, with second opening of the second heat exchanger mouth fluid communication, with compressor suction and compressor discharge in a fluid communication the 3rd opening, with compressor suction and compressor discharge in the 4th opening of another one fluid communication.High-pressure channel is limited at before first opening and the 4th opening, be used for providing the fluid communication between the first heat exchanger mouth, compressor suction and compressor discharge one, low-pressure channel is limited between second opening and the 3rd opens, and is used for providing the fluid communication between the another one of the second heat exchanger mouth, compressor suction and compressor discharge.Described spool can rotate between the primary importance and the second place around rotation axis.When spool is in the first position, the 3rd opening and compressor suction fluid communication, the 4th opening and compressor discharge fluid communication; When spool is in the second place, the 3rd opening and compressor discharge fluid communication, the 4th opening and compressor suction fluid communication.Refrigeration system turns round under refrigerating mode when spool is in the first position, and refrigeration system turns round under heating mode when spool is in the second place.

These features and the further feature that will can better understand the present invention by following description and accompanying drawing.

Description of drawings

To general detailed description of preferred embodiment, various feature and advantage of the present invention will become apparent to those skilled in the art by following.As follows to briefly introducing of Figure of description:

Fig. 1 has shown the refrigeration system that adopts four-way change-over valve;

Fig. 2 has shown the four-way change-over valve that is in primary importance;

Fig. 3 has shown the four-way change-over valve that is in the second place;

Fig. 4 has shown the perspective view of the four-way change-over valve that is in primary importance;

Fig. 5 has shown the perspective view of the four-way change-over valve that mediates;

Fig. 6 has shown the perspective view of the four-way change-over valve that is in the second place;

Fig. 7 has shown the perspective view of the fluid passage element of spool;

Fig. 8 has shown along the sectional elevation of the spool fluid passage element of Fig. 7 center line 8-8;

Fig. 9 has shown along the sectional view of the spool fluid passage element of Fig. 7 center line 9-9;

Figure 10 has shown the front perspective view of spool driving mechanism;

Figure 11 has shown the rear view of spool driving mechanism;

Figure 12 has shown the perspective view of single spool; With

Figure 13 has shown along the sectional view of the single spool of Figure 12 center line 13-13;

Figure 14 has shown the start-up system of the four-way change-over valve that is in the first position; With

Figure 15 has shown the start-up system of the four-way change-over valve that is in the second place.

Embodiment

Fig. 1 has shown heat pump loop or refrigeration system 20, comprises compressor 22, first heat exchanger 24, expansion gear 26, second heat exchanger 28.Refrigeration agent passes closed-loop refrigeration systems 20 circulations.

When refrigeration system 20 turned round under refrigerating mode, refrigeration agent passed overcompression machine discharge pipe line 38 and leaves compressor 22 with high pressure Gao Han, and flows through first heat exchanger 24 as condenser.At these first heat exchanger, 24 places, refrigeration agent is with heat transferred fluid (for example air) and be condensed into liquid, and this liquid leaves first heat exchanger 24 with low enthalpy high pressure.Fan 30 passes through first heat exchanger 24 with the air guiding.Refrigeration agent through supercooling then passes through expansion gear 26, makes refrigeration agent be expanded to low pressure.After overexpansion, refrigeration agent flows through second heat exchanger 28 as vaporizer.At these second heat exchanger, 28 places, refrigeration agent is accepted the heat from one other fluid (for example air), leaves second heat exchanger 28 with high enthalpy low pressure.Fan 32 passes through second heat exchanger 28 with the air guiding, thus cooled region 120.Refrigeration agent then flows through compressor suction pipeline 36 and turns back to compressor 22, finishes this circulation.

Four-way change-over valve 34 (describing hereinafter) can change the direction of refrigeration agent stream, thereby realizes that refrigeration system 20 turns round under heating mode.Be guided second heat exchanger 28 from the refrigeration agent of compressor, be passed to from the heat of refrigeration agent and be used for heating region 20 in the air as condenser.Refrigeration agent from second heat exchanger 28 expands in expansion gear 26.Then refrigeration agent flows through as first heat exchanger 24 of vaporizer and accepts heat from air.Refrigeration agent then flows in the compressor suction pipeline 36 and enters compressor 22, finishes this circulation.

Fig. 2 schematically illustrates the part of the four-way change-over valve 34 that is in primary importance.The 3rd member 134 will be offered from the fluid of second member 132, first member 130 will be offered from the fluid of the 4th member 136.

Fig. 3 schematically illustrates the part of the four-way change-over valve 34 that is in the second place.Second member 132 will be offered from the fluid of the 4th member 136, the 3rd member 134 will be offered from the fluid of first member 130.

Fig. 4-6 shown four-way change-over valve 34 from primary importance (shown in Figure 4) to the neutral position (shown in Figure 5) to the motion of the second place (shown in Figure 6).This four-way change-over valve 34 comprises valve body 40 and the hollow valve core 42 (valve element) that is contained in the valve body 40.Spool 42 rotates around rotational axis x.Spool 42 comprises fluid passage element 80 (shown in Fig. 7-9) and driving element 82 (shown in Figure 10 and 11).

Valve body 40 comprise with the port 46 of first member, 130 fluid communication, with the port 50 of second member, 132 fluid communication, with the port 48 of the 3rd member 134 fluid communication and with the port 44 of the 4th member 136 fluid communication.The pipe diameter of the pipe diameter of four-way change-over valve 34 and

port

44,46,48,50 is almost equal.

Valve body 40 also comprises first pipeline 52 and second pipeline 54.

Pipeline

52 and 54 has this length perpendicular to rotational axis x of a segment base.Each

pipeline

52 and 54 comprises

end face

56 and 58 and comprise

opposing end surface

60 and 62 respectively respectively.In an example,

pipeline

52 and 54 is substantially parallel.

Fig. 7-9 has shown the fluid passage element 80 of spool 42.Spool 42 comprises first passage 66 and second channel 68.First passage 66 comprise with the opening 72 of second member, 132 fluid communication, with the opening 70 of the 3rd member 134 or the 4th member 136 fluid communication.First passage 66 provides the fluid communication between opening 70 and 72.Second channel 68 comprise with the opening 74 of first member, 130 fluid communication, with the opening 76 of the 3rd member 134 or the 4th member 136 fluid communication.Second channel 68 provides the fluid communication between opening 74 and 76.Opening 74 continuous with first member, 130 fluid communication, opening 72 continuous with second member, 132 fluid communication.In an example, rotational axis x is through opening 72 and 74.In an example, the first axle that is limited between opening 72 and 74 is basically perpendicular to second axis that is limited between opening 70 and 76.

Fig. 2 and 4 has shown the spool 42 that is in primary importance.Opening 72 aligns with the port 50 of second member 132, and opening 70 aligns with the port 48 of the 3rd member 134.Fluid from second member 132 is guided the 3rd member 134.Opening 74 aligns with the port 46 of first member 130, and opening 76 aligns with the port 44 of the 4th member 136.Fluid from the 4th member 136 is guided first member 130.

Fig. 3 and 6 has shown the spool 42 that is in the second place.Opening 76 aligns with the port 48 of the 3rd member 134, and opening 74 aligns with the port 46 of first member 130.Fluid from first member 130 is guided the 3rd member 134.Opening 70 aligns with the port 44 of the 4th member 136, and opening 72 aligns with the port 50 of second member 132.Fluid from the 4th member 136 is guided second member 132.

Figure 10 and 11 has shown the perspective view of the driving element 82 of spool 42.Driving element 82 comprises the projection 86 that engages with the recess 84 of fluid passage element 80.In an example, be provided with two projections 86, each all aligns with one of them of two recesses 84 and engages.Projection 86 is contained in the recess 84, makes

element

80 and 82 alignment, thus the rotation of the rotation propelling fluid pass element 80 of driving element 82.In another example, driving element 82 comprises recess 84, and fluid passage element 80 comprises projection 86.Yet element 80 can be connected in any way with 82.In another example shown in Figure 12 and 13, spool 42 (element 80 and 82) forms single integrated member, just no longer needs connection features.

Driving element 82 also comprises neck 88, and neck 88 comprises a plurality of teeth 90 around neck 88 along extending circumferentially.In an example, each all radially extends from rotational axis x in a plurality of teeth 90.Driving element 82 also comprises the passage 122 with port 50 and opening 72 fluid communication.That is, passage 122 is limited between opening 72 and the port 50.

Get back to Fig. 4-6,

tooth bar

92 and 94 is contained in respectively in each

pipeline

52 and 54 of four-way change-over valve 34.Each

tooth bar

92 and 94 comprises a plurality of

teeth

96 and 98 respectively.Described tooth bar 92 and a plurality of teeth 96 of 94 and 98 and a plurality of teeth 90 engagements of spool 42.Along with the linearity of

tooth bar

92 and 94 moves (as mentioned below), tooth bar 92 and a plurality of

teeth

96 and 98 of 94 respectively with a plurality of teeth 90 engagements of spool 42 driving elements 82, thereby rotational valve core 42.Piston 100 and 102 is arranged on each end of tooth bar 92, thus supporting tooth bar 92,

piston

104 and 106 is arranged on each end of tooth bar 94, thus supporting tooth bar 94.Though show and described two

pipelines

52 and 54 and two

tooth bars

92 and 94, also can only adopt a

tooth bar

92 or 94 to come rotational valve core 42.

Fig. 4 and 14 has shown the four-way change-over valve 34 that is in primary importance.When spool 42 will be moved to the second place, spool 42 rotated 180 ° along first direction A.When spool 42 rotates about 90 ° when arriving position shown in Figure 5, bypass port 78 temporarily align (description hereinafter) with port 44 and 48.In case finish 180 ° rotation, four-way change-over valve 34 is on the second place, shown in Fig. 3,6 and 15.

When spool 42 will be moved to primary importance, spool 42 rotated 180 ° along second direction B.When spool 42 rotates about 90 ° when arriving position shown in Figure 5, bypass port 78 is alignd with port 44 and 48.In case finish 180 ° rotation, four-way change-over valve 34 is in the first position, shown in Fig. 2,4 and 14.

In an example shown in Figure 5, bypass port 78 is formed on the surface of spool 42 with the X-shaped shape substantially.Shown in Fig. 7-9, bypass port 78 is included in the main passage 140 of the whole width D that extends through spool 42 between passage 66 and 68.That is, extend between two surfaces of spool 42 main passage 140.Bypass port 78 also comprises crosses the second channel 142 that extend main passage 140.As shown in Figure 9, second channel 142 only has the width D that spool 42 passes in height H and local extension.All be provided with second channel 142 on each in two surfaces of spool 42, second channel crosses the main passage 140 that extends through width D.As mentioned below, when spool 42 mediated, when exhaust fluid was had nowhere to go, the second channel 142 that width reduces helped fluid is directed into main passage 140.

In an example, four-way change-over valve 34 can be used in the refrigeration system shown in Figure 1 20, thus the operation of conversion refrigeration system 20 between refrigeration mode (when spool 42 is in primary importance) and heating mode (when spool 42 is in the second place).In this example, first heat exchanger 24 is that first member, 130, the second heat exchangers 28 are second members 132, and compressor suction pipeline 36 is the 3rd members 134, and compressor discharge pipeline 38 is the 4th members 136.

In an example, the port 48 that communicates with compressor suction pipeline 36 is arranged on the port 44 that communicates with compressor discharge pipeline 38, and the pressure reduction between compressor discharge pipeline 38 and the compressor suction pipeline 36 can be offset any gravitational effects on the spool 42.When fluid passage element 80 mediated, bypass port 78 was alignd with

port

44 and 48, made high-pressure refrigerant bypass in the port 44 to port 48, prevented high-pressure discharge.

Shown in Figure 14 and 15, pilot valve 108

control tooth bar

92 and 94 motion and the rotations of controlling spool 42 thus.Pilot valve 108 control is 52 and 54 pressure flow direction from compressor discharge pipeline 38 to pipeline, thus mobile rack 92 and 94.Pilot valve 108 is the small-sized four-way change-over valves that are provided with four pipeline D, C, S and E.Pipeline D is connected to compressor discharge pipeline 38 by capillary tube, and pipeline S is connected to compressor suction pipeline 36 by capillary tube.

In refrigerating mode, pilot valve 108 provides the fluid between pipeline D and the pipeline C to be communicated with, and provides the fluid between pipeline E and the pipeline S to be communicated with.Therefore, pipeline C is communicated with high-pressure discharge pipeline 38 fluids, and pipeline E is communicated with low-pressure suction pipeline 36 fluids.Along pipeline 114 direct high pressure, along pipeline 112 guiding low pressure near

end face

56 and 62 near end face 58 and 60.Pressure reduction moves to position shown in Figure 14 with

tooth bar

92 and 94.

In the heating mode process, pilot valve 108 provides the fluid between pipeline D and the pipeline E to be communicated with, and provides the fluid between pipeline C and the pipeline S to be communicated with.Therefore, pipeline E is communicated with high-pressure discharge pipeline 38 fluids, and pipeline C is communicated with low-pressure suction pipeline 36 fluids.Along pipeline 112 direct high pressure, along pipeline 114 guiding low pressure near

end face

58 and 60 near end face 56 and 62.Pressure reduction moves to position shown in Figure 15 with

tooth bar

92 and 94.

Select operating mode in controller 110 (cooling or heating).Based on this operator scheme, pilot valve 108 will direct into the

end face

56,58,60 and 62 of

tooth bar

92 and 94 from the pressure of refrigeration system 20 respectively, thereby the member of mobile four-way change-over valve 34 is so that change the operation of refrigeration system 20 in (between position shown in Figure 14 and position shown in Figure 15) between refrigerating mode and the heating mode.Differential pressure action on each piston 100,102,104 and 106 with linear

mobile rack

92 and 94, thereby along anticipated orientation rotational valve core 42.

Fig. 2,4 and 14 has shown the four-way change-over valve 34 when refrigeration system 20 is operated under refrigerating mode.Opening 76 aligns with port 44, so that refrigeration agent is directed to first heat exchanger 24 (as the cold air device) from compressor discharge pipeline 38, opening 70 aligns with port 48, so that refrigeration agent second heat exchanger 28 (as vaporizer) is directed to compressor suction pipeline 36.

If refrigeration system 20 will be operated under heating mode, controller 110 sends to pilot valve 108 will pass the signal that pipeline 112 is directed to

piston

100 and 106 from the high pressure of compressor discharge pipeline 38.With respect to Figure 14, impel tooth bar 92 to move to the right side, tooth bar 94 moves to the left side.Along with moving of

tooth bar

92 and 94, tooth bar 92 and a plurality of

teeth

96 and 98 of 94 respectively with a plurality of teeth 90 engagements of spool 42 driving elements 82, along direction A rotating drive element 82, rotate the fluid passage element of setting up 80 thus.In case spool 42 rotates 90 °, bypass port 78 is alignd (as shown in Figure 5) with

port

44 and 48, makes high-pressure refrigerant circuitous between

port

44 and 48.

Tooth bar

92 and 94 continue to move, and contacts the

end face

60 and 58 of

pipeline

52 and 54 respectively up to

piston

102 and 104, and stop is provided.Spool 42 rotates 180 ° and arrives the position shown in Fig. 3,6 and 15.On this position, refrigeration system 20 is operated under heating mode.Opening 76 aligns with port 48, and feasible refrigeration agent from first heat exchanger 24 (as vaporizer) is provided to compressor suction pipeline 36.Opening 70 aligns with port 44, and feasible refrigeration agent from compressor discharge pipeline 38 is provided to second heat exchanger 28 (as condenser).

If refrigeration system 20 is operated under refrigerating mode, controller 110 sends to pilot valve 108 will pass the signal that pipeline 114 is directed to

piston

102 and 104 from the high pressure of compressor discharge pipeline 38.With respect to Figure 15, impel tooth bar 92 to move to the left side, tooth bar 94 moves to the right side.Along with moving of

tooth bar

92 and 94, tooth bar 92 and a plurality of

teeth

96 and 98 of 94 respectively with a plurality of teeth 90 engagements of spool 42 driving elements 82, along direction B rotating drive element 82, rotate the fluid passage element of setting up 80 thus.In case spool 42 rotates 90 °, bypass port 78 is alignd (as shown in Figure 5) with

port

44 and 48, makes high-pressure refrigerant circuitous between

port

44 and 48.

Tooth bar

92 and 94 continue to rotate, and contacts the

end face

56 and 62 of

pipeline

52 and 54 respectively up to

piston

100 and 106, and stop is provided.Spool 42 rotates 180 ° and arrives the position shown in Fig. 2,4 and 14.On this position, refrigeration system 20 is operated under refrigerating mode.Opening 70 aligns with port 48, and feasible refrigeration agent from second heat exchanger 28 (as vaporizer) is provided to compressor suction pipeline 36.Opening 76 aligns with port 44, and feasible refrigeration agent from compressor discharge pipeline 38 is provided to first heat exchanger 24 (as condenser).

Be used for refrigeration system 20 though four-way change-over valve 34 has been disclosed and has been shown as, should be understood that this four-way change-over valve 34 can be used for the system of any kind.

This four-way change-over valve 34 provides lot of advantages with respect to selector valve of the prior art.One, when only adopting a valve, pipeline is uncomplicated, reduces internal leakage.This four-way change-over valve 34 also provides the simple circuitous of pressurized gas.In addition,, therefore no longer need ABAP Adapter, reduced unnecessary pressure drop because the pipeline of four-way change-over valve 34 has the diameter identical with the pipeline of refrigeration system 20 basically.Also increased the volume of four-way change-over valve 34.

Though adopted direction " left side ", " right side ", " counterclockwise " etc. in the foregoing description, these terms only are used for the disclosed embodiments, right and wrong are determinate for moving direction.

Foregoing description only is the example of the principle of the invention.Under above-mentioned enlightenment, multiple modification of the present invention and distortion are possible.The preferred embodiments of the present invention are open, but someone skilled in the art will appreciate that certain variations falls within the scope of the present invention.Therefore, should be understood that within the scope of the appended claims that the present invention can implement to be different from mode described in detail.For the foregoing reasons, following claim should be used for determining the actual scope and content of the present invention.

Claims

1. selector valve comprises:

Valve body is provided with first port, second port, the 3rd port and the 4th port; With

Spool, comprise first opening that communicates with the first port continuous fluid, second opening that communicates with the second port continuous fluid, the 3rd opening that communicates with a continuous fluid in the 3rd port and the 4th port, the 4th opening that communicates with another continuous fluid in the 3rd port and the 4th port, wherein first passage is limited between second opening and the 3rd opening, be used to provide second port, fluid communication between one in the 3rd port and the 4th port, second channel is limited between first opening and the 4th opening, be used to provide first port, fluid communication between in the 3rd port and the 4th port another and

Wherein said spool can rotate between the primary importance and the second place with respect to valve body around rotation axis, when spool is in the first position, the 3rd opening and the 3rd port fluid communication, the 4th opening and the 4th port fluid communication, when spool is in the second place, the 3rd opening and the 4th port fluid communication, the 4th opening and the 3rd port fluid communication.

2. selector valve according to claim 1 is characterized in that: described spool rotates about 180 ° between the primary importance and the second place.

3. selector valve according to claim 1, it is characterized in that: described spool comprises bypass port and be provided with the neutral position between the primary importance and the second place, when spool mediated, fluid flow through bypass port between the 3rd port and the 3rd port.

4. selector valve according to claim 3 is characterized in that: this neutral position be in the first position and the second place between about 90 ° place.

5. selector valve according to claim 3 is characterized in that: described bypass port comprises that passing valve core diameter first passage that extends and the part of crossing first passage passes the second channel that valve core diameter extends.

6. selector valve according to claim 1 also comprises: be connected to the driving element that is used for rotational valve core on the spool.

7. selector valve according to claim 6 is characterized in that: this driving element and spool are whole to be formed.

8. selector valve according to claim 6 is characterized in that: this driving element defines one of them at least a portion of first passage and second channel.

9. selector valve according to claim 6 also comprises: be connected to and be used for the rotating drive element and the driving mechanism of rotational valve core thus on the driving element.

10. selector valve according to claim 9, it is characterized in that: described driving mechanism comprises can be basically perpendicular at least one tooth bar that spool length moves, this at least one tooth bar can with drive engages, be used between the primary importance and the second place rotating drive element and rotational valve core thus.

11. selector valve according to claim 10, it is characterized in that: this at least one tooth bar turns to the second place with spool from primary importance along moving of first direction, and this at least one tooth bar turns to primary importance with spool from the second place along moving of opposite second direction.

12. selector valve according to claim 10 is characterized in that: described driving mechanism also comprises the piston that is connected on this at least one tooth bar, is used to respond the pressure that is applied on the piston and moves this at least one tooth bar.

13. selector valve according to claim 12 is characterized in that: described pressure is provided by the compressor discharge pipeline.

14. selector valve according to claim 10, it is characterized in that: described driving mechanism comprises first tooth bar and second tooth bar, wherein first tooth bar is configured to spool is moved to the second place from primary importance, and second tooth bar is configured to spool is moved to primary importance from the second place.

15. selector valve according to claim 1 is characterized in that: first port aligns with second port along first axle, and the 3rd port aligns with the 4th port along second axis, basic vertical and second axis of described first axle.

16. a refrigeration system comprises:

Compressor is used for refrigeration agent is compressed to high pressure;

First heat exchanger is used for the heat between an exchange system cryogen and the fluid;

Expansion gear is used for refrigeration agent is expand into low pressure;

Second heat exchanger is used for heat between exchange system cryogen and another fluid;

Selector valve, comprise and be provided with the first heat exchanger mouth, the second heat exchanger mouth, the valve body of compressor suction and compressor discharge, this selector valve comprises spool, described spool comprises the valve element, this element comprises first opening with the first heat exchanger mouth fluid communication, second opening with the second heat exchanger mouth fluid communication, the 3rd opening with a fluid communication in compressor suction and the compressor discharge, the 4th opening with another one fluid communication in compressor suction and the compressor discharge, one of them high-pressure channel is limited between first opening and the 4th opening, be used to provide the first heat exchanger mouth, fluid communication between one in compressor suction and the compressor discharge, low-pressure channel is limited between second opening and the 3rd opens, be used to provide the second heat exchanger mouth, fluid communication between the another one in compressor suction and the compressor discharge

Wherein said spool can rotate between the primary importance and the second place around rotation axis, when spool is in the first position, and the 3rd opening and compressor suction fluid communication, the 4th opening and compressor discharge fluid communication; When spool is in the second place, the 3rd opening and compressor discharge fluid communication, the 4th opening and compressor suction fluid communication and

Wherein refrigeration system turns round under refrigerating mode when spool is in the first position, and refrigeration system turns round under heating mode when spool is in the second place.