CN101307758A

CN101307758A - Temperature control device for variable displacement compressor

Info

Publication number: CN101307758A
Application number: CNA2008100990330A
Authority: CN
Inventors: 结城卓也
Original assignee: TGK Co Ltd
Current assignee: TGK Co Ltd
Priority date: 2007-05-16
Filing date: 2008-05-15
Publication date: 2008-11-19
Also published as: DE102008021412A1; JP2008286065A

Abstract

A temperature control device for a variable displacement compressor is disclosed, to prevent over-temperature of a refrigerant compressed by a compressor when refrigeration load is high during refrigeration cycle using an internal heat exchanger. The temperature control device is arranged in parallel to a displacement control valve, to sense temperature of the compressor. When sensing a temperature higher than a preset one, the temperature control device supplies a refrigerant under a displacement pressure to a crankcase so as to increase pressure therein, and undergoes forced control for the compressor along a direction that reduces the displacement of the compressor to reduce the temperature of the refrigerant under the displacement pressure so as to prevent the temperature of the compressor from rising higher than the preset temperature.

Description

The temperature control apparatus that is used for variable compressor

Technical field

The present invention relates to a kind of temperature control apparatus that is used for variable compressor, relate more specifically to be used for temperature control apparatus at the variable compressor of the refrigeration cycle compressed refrigerant of car air conditioner.

Background technique

Car air conditioner utilizes condenser and outside air to carry out the high-temperature gas refrigeration agent that heat exchange comes condensation to compress by variable compressor, utilize the receiver/dryer device that condensed refrigerant is separated into gas and liquid, the liquid refrigerant that utilizes expansion valve to expand and separate, utilize vaporizer by with the compartment in air heat exchange evaporate the gas-liquid mixed refrigerant of expansion, and make the gaseous refrigerant of evaporation turn back to compressor, thereby form refrigeration cycle.

But,,, also be difficult to cooling down high-temperature gaseous refrigerant before condensation of refrigerant sometimes even attempt utilizes outside air to come the cooling down high-temperature gaseous refrigerant by condenser at high-temperature area.Expansion valve receives liquid refrigerant and adiabatic ground expansion liquid state refrigeration agent, thereby obtains low-temperature refrigerant, if the device condensation but the gaseous refrigerant that compressor is discharged is not condensed, air-conditioning meeting thereby quit work.

In order to address this problem, proposed to adopt the system (as Japanese unexamined patent publication No. communique No.2000-292016) of inner heat exchanger in refrigeration cycle.Carry out heat exchange between the refrigeration agent that inner heat exchanger sucks the refrigeration agent that is fed to expansion valve and compressor, the low-temperature refrigerant that utilizes compressor to suck cools off the high temperature refrigerant that is fed to expansion valve, thereby stable liquid refrigerant can be fed in the expansion valve.

And, to compare with the refrigeration cycle that does not have inner heat exchanger, the refrigeration cycle that is provided with inner heat exchanger has higher cooling capacity and efficient.Therefore, be envisaged in to be used in high temperature area and other regional air-conditionings and all use refrigeration cycle with inner heat exchanger.

But the favourable part that is provided with the refrigeration cycle of variable compressor and inner heat exchanger is to cool off the refrigeration agent that infeeds in the expansion valve.But from the suction side of compressor, when especially higher and compressor was with maximum performance work when refrigeration load, the temperature that its problem is to infeed the refrigeration agent of compressor uprised.More particularly, when compressor sucked and compress high temperature refrigerant, the temperature of the refrigeration agent of discharging was still higher, surpassed the maximum permissible temperature of compressor lubricant oil sometimes.In case the temperature of lubricant oil uprises, oxidation will take place in lubricant oil, even behind its temperature step-down, lubricant oil can not recover stably to form the necessary viscosity of oil film.Worse, lubricant oil has lost lubricating function, and this can cause the serious problems that compressor is killed.

Summary of the invention

In view of having made the present invention in above-mentioned aspect, the object of the present invention is to provide a kind of temperature control apparatus that is used for variable compressor, it prevents to be become too high by the temperature of compressor refrigerant compressed when the refrigeration load of the refrigeration cycle of using inner heat exchanger is higher.

To achieve these goals, the invention provides a kind of temperature control apparatus that is used for variable compressor, this temperature control apparatus comprises heat-sensitive actuating device and the valve that is arranged in the variable compressor, described valve is used for controlling the pressure of the crankcase of compressor, temperature in the described heat-sensitive actuating device sensing compressor activates described valve along the direction that increases the pressure in the described crankcase when being higher than predetermined temperature to become in temperature.

Following explanation in conjunction with the drawings can be known above-mentioned and other purposes of the present invention, feature and advantage, and these accompanying drawings show preferred implementation of the present invention with by way of example.

Description of drawings

Fig. 1 is a system diagram, shows the refrigeration cycle of the temperature control apparatus that is used for variable compressor of application the first to the 14 mode of execution and modified example according to the present invention.

Fig. 2 is the central longitudinal sectional view according to the temperature control apparatus of first embodiment of the invention.

Fig. 3 is the central longitudinal sectional view according to the temperature control apparatus of second embodiment of the invention.

Fig. 4 is the central longitudinal sectional view according to the temperature control apparatus of third embodiment of the invention.

Fig. 5 is the central longitudinal sectional view according to the temperature control apparatus of four embodiment of the invention.

Fig. 6 is the central longitudinal sectional view of displacement control valve of expression fifth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of first mode of execution.

Fig. 7 is the central longitudinal sectional view of displacement control valve of expression sixth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of first mode of execution.

Fig. 8 is the central longitudinal sectional view of displacement control valve of expression seventh embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of first mode of execution.

Fig. 9 is the central longitudinal sectional view of displacement control valve of expression eighth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of second mode of execution.

Figure 10 is the central longitudinal sectional view of displacement control valve of expression ninth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of first and second mode of executions.

Figure 11 is the central longitudinal sectional view of displacement control valve of expression tenth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of second mode of execution.

Figure 12 is the central longitudinal sectional view of displacement control valve of expression eleventh embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of first and second mode of executions.

Figure 13 is the central longitudinal sectional view of displacement control valve of expression twelveth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of third and fourth mode of execution.

Figure 14 is the central longitudinal sectional view of the modified example of the displacement control valve of expression twelveth embodiment of the invention.

Figure 15 is the central longitudinal sectional view of displacement control valve of expression thirteenth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of third and fourth mode of execution.

Figure 16 is the central longitudinal sectional view of the modified example of the displacement control valve of expression thirteenth embodiment of the invention.

Figure 17 is the central longitudinal sectional view of displacement control valve of expression fourteenth embodiment of the invention, is applied to this displacement control valve according to the temperature control apparatus of third and fourth mode of execution.

Figure 18 is the central longitudinal sectional view of the modified example of the displacement control valve of expression fourteenth embodiment of the invention.

Figure 19 is a system diagram, shows the refrigeration cycle of application temperature control apparatus that is used for variable compressor of the 15 and the 16 mode of execution according to the present invention.

Figure 20 is the central longitudinal sectional view according to the temperature control apparatus of the 15 mode of execution.

Figure 21 is the central longitudinal sectional view according to the temperature control apparatus of the 16 mode of execution.

Embodiment

Hereinafter, describe embodiments of the present invention with reference to the accompanying drawings in detail.

This refrigeration cycle comprises: the variable compressor 1 of compressed refrigerant; Make compressed refrigerant condenser condensing 2; The refrigeration agent of cooling is separated into the receiver/dryer device 3 of gas and liquid; Expansion valve 4, its throttling and the liquid refrigerant that expands and obtain by gas-liquid separation; Vaporizer 5, the refrigeration agent that its evaporation is expanded by expansion valve; And inner heat exchanger 6, it makes to flow to the refrigeration agent of expansion valve 4 and flow to from vaporizer 5 between the refrigeration agent of variable compressor 1 from receiver/dryer device 3 and carries out heat exchange.

Variable compressor 1 comprises: be arranged on the displacement control valve 7 in the passage between discharge chamber and the crankcase, thereby its flow velocity that is used for controlling refrigeration agent is incorporated into crankcase with compressed refrigerant under discharge pressure Pd; And being arranged on hole 8 in the passage between crankcase and the suction chamber, it is used for allowing refrigeration agent to release suction chamber from crankcase under suction pressure Ps.When hole 8 allowed refrigeration agent to release the suction chamber from crankcase, displacement control valve 7 controls were incorporated into the flow velocity of the compressed refrigerant in the crankcase, thus the pressure P c in the control crankcase, to change the discharge capacity of variable compressor 1.

Variable compressor 1 also comprises the temperature control apparatus 10a that is arranged in parallel with displacement control valve 7.Temperature in the temperature control apparatus 10a sensing variable compressor 1, and when this temperature is higher than predetermined temperature, change the discharge capacity of variable compressor 1, make discharge capacity diminish.Temperature control apparatus 10a is independent of displacement control valve 7 operations.

In pressing the variable compressor 1 of above-mentioned structure, displacement control valve 7 is controlled the discharge capacity of compressor 1 changeably, makes the engine speed that promptly is used in Driven Compressor 1 change, and also can keep predefined discharge capacity.For example, when engine speed raise, the discharge pressure Pd of compressor 1 increased and reduces suction pressure Ps.The increase of sensing discharge pressure Pd and/or the displacement control valve that reduces 7 of suction pressure Ps make the flow velocity increase that flows to the refrigeration agent of crankcase from discharge chamber, thereby the pressure P c in the raising crankcase, control the discharge capacity of compressor 1 whereby changeably, make discharge capacity diminish.Thus, displacement control valve 7 makes from the refrigerant volume (discharge capacity of compressor 1) of compressor 1 discharging and keeps equaling predefined volume (discharge capacity).Opposite is that when engine speed reduced, the pressure P c in the displacement control valve 7 reduction crankcases kept equaling predefined volume to increase discharge capacity thereby make from the refrigerant volume of variable compressor 1 discharging.At this moment, the temperature in compressor 1 is not higher than under the normal state of predetermined temperature, and temperature control apparatus 10a does not work.

When variable compressor 1 was just controlled by displacement control valve 7, if for example refrigeration load is higher and compressor 1 continues with maximum performance work, then the refrigerant temperature from the discharge chamber discharging uprised.When the temperature of refrigeration agent of discharging uprise and compressor 1 in temperature become when being higher than predetermined temperature, temperature control apparatus 10a work is to be incorporated into crankcase with refrigeration agent from discharge chamber, so that the pressure P c in the raising crankcase, it is littler whereby compressor 1 to be controlled to discharge capacity.As a result, the temperature reduction owing to the refrigeration agent that discharges from compressor 1 has prevented to be higher than its permissible temperature with refrigeration agent via the temperature that the refrigeration cycle circuit is used for the lubricant oil of compressor 1, can prevent the lubricant oil thermal degradation thus.

Fig. 2 is the central longitudinal sectional view according to the structure of the temperature control apparatus of first embodiment of the invention.

Temperature control apparatus 10b according to first mode of execution has cylinder-shaped body 11, to use under the state in the passage between discharge chamber that is arranged on variable compressor 1 and crankcase.One end of main body 11 is formed with and the inlet 12 that starts from the channel connection of discharge chamber.The other end of main body 11 is formed with the outlet 13 with the channel connection that arrives crankcase.At inlet 12 with export to be formed with between 13 and be used to passage that refrigeration agent is passed through.The middle body of this passage is formed with stepped part, and it forms valve seat 14.Valve member 15 is arranged on the outlet side of valve seat 14, make valve member 15 can towards with away from valve seat 14 motion.The inlet side of valve member 15 is provided with and is used for opening the shape memory alloy spring 16 that direction promotes valve member 15 along valve, and the outlet side of valve member 15 is provided with the wind spring 17 of tapered shape, and it is used for promoting valve member 15 along the valve closing direction.In this case, valve seat 14, valve member 15 and wind spring 17 form the normal close type valve that opens and closes by shape memory alloy spring 16.The adjustment screw 18 that wind spring 17 is screwed in the outlet 13 receives, and adjusts the load of wind spring 17 by the amount of being screwed into of adjusting screw 18.

Load towards 12 shape memory alloy springs 16 that are provided with that enter the mouth reversibly changes with respect to temperature cycles.Shape memory alloy spring 16 has such characteristic, that is: when temperature was lower than deformation temperature, its load on spring was less, and the temperature variant pace of change of load on spring is also less.And shape memory alloy spring 16 has such characteristic, that is: when temperature was higher than deformation temperature, its load on spring and temperature variation sharply increased pro rata.Therefore, when the temperature that senses thus was low, shape memory alloy spring 16 was as conventional spring-operated, and when the temperature that senses thus surpassed particular value, its load on spring sharply increased, thereby as the heat-sensitive actuating device of forcing valve member 15 to be opened.The deformation temperature of shape memory alloy spring 16 is set at the maximum permissible temperature that its value is not higher than the lubricant oil of compressor 1.

The load on spring that the wind spring 17 that is provided with towards outlet 13 is had is set for, makes valve can not open by discharge pressure Pd in the discharge chamber of compressor 1 and the pressure reduction between the pressure P c in the crankcase.And, wind spring 17 also is used from the effect that makes the biasing spring that shape memory alloy spring 16 returns, this shape memory alloy spring 16 is extended into shape memory when temperature is higher than predetermined temperature sensing, and is extended into contraction state when this temperature is lower than predetermined temperature.

According to by the temperature control apparatus 10b of above-mentioned structure, when lower and variable compressor 1 continues to work with minimum injection rate or in the excursion of discharge capacity when refrigeration load, be in the height that the temperature of the refrigeration agent under the discharge pressure Pd can not become unusual.Therefore, the load on spring that has sensed the shape memory alloy spring 16 that is in the refrigerant temperature under the discharge pressure Pd is lower, thereby valve is promoted by wind spring 17 and cuts out.This makes temperature control apparatus 10b keep its closed condition.

On the other hand, when higher and variable compressor 1 continues to operate with maximum pump discharge when refrigeration load, be in the temperature anomaly height of the refrigeration agent under the discharge pressure Pd, it is big that the load on spring of shape memory alloy spring 16 becomes, make spring 16 overcome the Driving force of wind spring 17 and stretch that valve member 15 rises and opens temperature control apparatus 10b from valve seat 14 thus.As a result, be in refrigeration agent under the discharge pressure Pd and be fed to crankcase and improve pressure P c in the crankcase, thus, compressor 1 is forced to be controlled to its discharge capacity is reduced, and is in the temperature of the refrigeration agent under the discharge pressure Pd with reduction.When the temperature of the refrigeration agent under being in discharge pressure Pd reduced, temperature control apparatus 10b closed, so that compressor 1 is placed under the control of displacement control valve 7.

Fig. 3 is the central longitudinal sectional view according to the structure of the temperature control apparatus that is used for variable compressor of second embodiment of the invention.In Fig. 3, the composed component identical with the composed component shown in Fig. 2 refers to identical label, and omits its detailed description.

Temperature control apparatus 10c according to second mode of execution is configured such that it is used for the sensing refrigerant temperature is not subjected to the pressure P c of discharge pressure Pd and crankcase with the operation of opening valve adverse effect.More particularly, the sidepiece of the main body 11 of temperature control apparatus 10c be formed with the inlet 12, main body 11 with the outlet 13 opening opposing tegmentums 19 close.The lid 19 have with can along valve open the mode of moving with the valve closing direction run through cover 19 settings pressure-sensing pistons 20.The external diameter of pressure-sensing piston 20 approximates the internal diameter of valve opening, and forms with valve member 15 integral body.Be equipped with stop ring 21 on pressure-sensing piston 20, the spring receiving member 22 that is used to receive shape memory alloy spring 16 engages with this stop ring 21, promotes pressure-sensing piston 20 thereby make shape memory alloy spring 16 open direction along valve.Should be noted that filter 23 is arranged on the sidepiece of main body 11 in the mode of sealing inlet 12.In addition,

O shape ring

24 and 25 is arranged on the axial opposite side of main body 11, and filter 23 is arranged between these O shape rings, thereby when temperature control apparatus 10c was combined in the variable compressor 1, the pressure P c in the crankcase of the discharge pressure Pd of inlet in 12 and the end face that is applied to outlet 13 and pressure-sensing piston 20 isolated.

According to temperature control apparatus 10c as above-mentioned structure, when higher and variable compressor 1 continues to work with maximum pump discharge when refrigeration load, the temperature that is in the refrigeration agent under the discharge pressure Pd becomes high unusually, make that the load on spring of shape memory alloy spring 16 is very big, this can cause spring 16 to overcome the Driving force of wind spring 17 and stretch, thereby opens temperature control apparatus 10c.This raises the pressure P c in the crankcase, thereby along the direction control compressor 1 that the discharge capacity that makes compressor 1 diminishes, reduces the temperature that is in the refrigeration agent under the discharge pressure Pd whereby.

It should be noted that, because the external diameter of pressure-sensing piston 20 forms the internal diameter that approximates valve opening, discharge pressure Pd opens direction and the valve closing direction is applied to valve member 15 and pressure-sensing piston 20 equably along valve respectively, discharge pressure Pd is cancelled thus, and, pressure P c opens direction along valve closing direction and valve respectively and is applied to valve member 15 and pressure-sensing piston 20 equably, and pressure P c is cancelled thus.Therefore, temperature control apparatus 10c operates the temperature with sensing variable compressor 1, thereby controls compressor along the direction that compressor displacement is diminished, and is not subjected to the adverse effect of discharge pressure Pd and pressure P c.

Fig. 4 is the central longitudinal sectional view according to the structure of the temperature control apparatus that is used for variable compressor of third embodiment of the invention.In Fig. 4, the composed component identical with the composed component shown in Fig. 2 refers to identical label, and omits its detailed description.

Different with temperature control apparatus 10b with 10c (their use shape memory alloy spring 16 as the heat-sensitive actuating device that is used to activate its valve) according to the Fig. 2 and first and second mode of executions shown in Figure 3, use bimetal piece 26 as the heat-sensitive actuating device according to the temperature control apparatus 10d of the 3rd mode of execution.Bimetal piece 26 circular in configuration.The periphery pine of bimetal piece 26 is assemblied in by being formed on the stepped part in the inlet 12 and being assemblied in the groove of hollow cylinder 27 formation in the inlet 12.The interior week of bimetal piece 26 engages with being assemblied in from the stop ring 29 of valve member 15 on inlet 12 axially extended axles 28.

According to temperature control apparatus 10d as above-mentioned structure, when in variable compressor 1 continues with minimum injection rate or the excursion in discharge capacity, working, the temperature that is in the refrigeration agent under the discharge pressure Pd is lower, thereby as shown in Figure 4, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, valve cuts out by the Driving force of wind spring 17 thus, so that temperature control apparatus 10d remains in closed condition.

When the temperature of the refrigeration agent under being in discharge pressure Pd raise, bimetal piece 26 as support and towards valve member 15 bendings, was opened the load on spring increase that direction is applied to axle 28 via stop ring 29 along valve with its periphery thus.It is unusual when high that the temperature of the refrigeration agent under being in discharge pressure Pd becomes, the shape reverse of bimetal piece 26 to, thereby overcome the Driving force of wind spring 17 and open direction pushing shaft 28 along valve, and make valve member 15 rise and open valve from valve seat 14.Therefore, temperature control apparatus 10d is opened, thereby the refrigeration agent that is under the discharge pressure Pd is fed to crankcase to increase the pressure P c in the crankcase, thereby force the discharge capacity of variable compressor 1 is diminished, the result, the temperature that is in the refrigeration agent under the discharge pressure Pd reduces, thereby preventing that this temperature from becoming is higher than predetermined temperature.

Fig. 5 is the central longitudinal sectional view according to the structure of the temperature control apparatus that is used for variable compressor of four embodiment of the invention.In Fig. 5, the composed component identical with the composed component shown in Fig. 3 and Fig. 4 refers to identical label, and omits its detailed description.

Different with the temperature control apparatus 10c according to second mode of execution of adverse effect type as offset pressure shown in Figure 3, be configured such that according to the temperature control apparatus 10e of the 4th mode of execution shape memory alloy spring 16 is replaced by bimetal piece 26.The periphery pine of bimetal piece 26 is assemblied in the groove, and this groove is formed by the lid 19 that is formed on the stepped part in the main body 11 and be assemblied in the opening that is formed at outlet 13 opposite sides.The interior week of bimetal piece 26 engages with stop ring 29 on being assemblied in pressure-sensing piston 20.

According to temperature control apparatus 10e as above-mentioned structure, when the temperature of the refrigeration agent under being in discharge pressure Pd is low, as shown in Figure 5, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, and makes temperature control apparatus 10e remain on its closed condition.

When the temperature of the refrigeration agent under being in discharge pressure Pd becomes and is higher than predetermined temperature, the shape reverse of bimetal piece 26 to, thereby overcome the Driving force of wind spring 17 and open direction along valve and promote piston 20, open temperature control apparatus 10e thus.Therefore, be in refrigeration agent under the discharge pressure Pd and be fed to crankcase and increase pressure P c in the crankcase, thereby force to be controlled to the discharge capacity of variable compressor 1 less.

In first to fourth mode of execution described above, 10b to 10e is described to temperature control apparatus, these temperature control apparatuss are arranged in the passage that forms in the variable compressor 1, sensing is in the temperature of discharging the refrigeration agent under the Pd that has an effect, and when this temperature becomes when being higher than predetermined temperature, the refrigeration agent that will be under the discharge pressure Pd is incorporated in the crankcase, thereby forces control variable compressor 1 along the direction that the discharge capacity that makes variable compressor 1 reduces.But, also can realize the function of said temperature control gear 10b to 10e by the present invention being applied to the displacement control valve 7 of controlling compressor 1.Below, the embodiment who temperature control apparatus is applied to displacement control valve 7 is described.

Fig. 6 is the central longitudinal sectional view of the displacement control valve of expression fifth embodiment of the invention.In Fig. 6, the composed component identical with the composed component shown in Fig. 2 refers to identical label, and omits its detailed description.

The 5th mode of execution shows the embodiment who the temperature control apparatus 10b according to first mode of execution among Fig. 2 is applied to the displacement control valve 30 of the first kind.Suction pressure Ps in the suction chamber of displacement control valve 30 sensing variable compressors 1 is to control the flow velocity that is incorporated into the refrigeration agent the crankcase from discharge chamber.Displacement control valve 30 is configured such that the value that can freely set the suction pressure Ps that makes to be controlled by external signal.

Displacement control valve 30 comprises: the barrier film 31 of sensing suction pressure Ps; Control flows to the valve portion 32 of flow velocity of the refrigeration agent of crankcase from discharge chamber; And solenoid 30, it sets the value of the suction pressure Ps that makes to be controlled.The barrier film 31 that is arranged between valve portion 32 and the solenoid 33 is configured such that the load that receives solenoid 33 receiving suction pressure Ps on the one surface on its another surface.Axially extended axle 34 is arranged between barrier film 31 and the valve portion 32, makes the variation of the suction pressure Ps that sensed by barrier film 31 be delivered to the valve member of valve portion 32 by axle 34.

The main body 35 of valve portion 32 is combined with structure and the temperature control apparatus identical according to the temperature control apparatus 10b of first mode of execution.This temperature control apparatus is arranged on valve portion 32 and is between the port of the port of the refrigeration agent under the discharge pressure Pd and valve portion 32 is controlled to pressure P c so as to conveying refrigeration agent so as to reception.Shape memory alloy spring 16 is arranged on valve portion 32 and is in the passage that the port of the refrigeration agent under the discharge pressure Pd is communicated with, so that sensing is in the temperature of the refrigeration agent under the discharge pressure Pd so as to reception.

In displacement control valve 30, when barrier film 31 moved axially by sensing suction pressure Ps, this moved via axle 34 and is delivered to valve member to cause 32 opening and closing of valve portion.Therefore, displacement control valve 30 sensing suction pressure Ps and control are fed to the flow velocity of the refrigeration agent of crankcase from discharge chamber, make suction pressure Ps become to equal the value of setting by solenoid 33.

Parallel with the work of displacement control valve 30, shape memory alloy spring 16 sensings are in the temperature of the refrigeration agent under the discharge pressure Pd.When this temperature becomes unusual when high, shape memory alloy spring 16 makes valve member 15 rise from valve seat 14, and the refrigeration agent that will be in discharge pressure Pd under is fed to crankcase, is controlled to be less with the discharge capacity pressure with compressor 1.

Fig. 7 is the central longitudinal sectional view of the displacement control valve of expression sixth embodiment of the invention.In Fig. 7, the composed component identical with the composed component shown in Fig. 2 refers to identical label, and omits its detailed description.

The 6th mode of execution shows the embodiment who the temperature control apparatus 10b according to first mode of execution among Fig. 2 is applied to the displacement control valve 40 of second type.Discharge pressure Pd in the discharge chamber of displacement control valve 40 sensing compressors 1 and the pressure reduction between the suction pressure Ps in the suction chamber, and control is incorporated into the flow velocity of the refrigeration agent of crankcase from discharge chamber.Displacement control valve 40 is configured such that and can freely sets the pressure difference of making to be controlled by external signal.

Displacement control valve 40 comprises: valve portion 41, and its control is caused the flow velocity that flows into the refrigeration agent of crankcase from discharge chamber; With solenoid 42, it sets the pressure difference of making to be controlled.And thereby the integrally formed axle 43 that forms pressure-sensitive member of the valve member of valve portion 41 is axially movably remained between valve portion 41 and the solenoid 42 by main body 45.One end face of axle 43 and axle 44 butts are to arrive the load transfer of solenoid 42 valve member of valve portion 41.At this moment, an end face of axle 43 receives the discharge pressure Pd that opens direction along valve via the valve opening of valve portion 41, its another end face receives the suction pressure Ps along the valve closing direction, makes to produce the load of opening direction along valve according to the pressure reduction between discharge pressure Pd and the suction pressure Ps.

Be press fitted on the main body 45 of valve portion 41 and axially form porose valve seat member 46 in it and be combined with structure and the temperature control apparatus identical according to the temperature control apparatus 10b of first mode of execution.This temperature control apparatus is arranged on valve portion 41 and is between the port of the port of the refrigeration agent under the discharge pressure Pd and valve portion 41 is controlled to pressure P c so as to conveying refrigeration agent so as to reception.Shape memory alloy spring 16 is arranged on valve portion 41 and is in the passage that the port of the refrigeration agent under the discharge pressure Pd is communicated with, so that sensing is in the temperature of the refrigeration agent under the discharge pressure Pd so as to reception.

In displacement control valve 40, the pressure reduction between described pressure-sensitive member sensing discharge pressure Pd and the suction pressure Ps, and cause valve portion 41 to open and close according to this pressure reduction.More particularly, the pressure reduction between displacement control valve 40 sensing discharge pressure Pd and the suction pressure Ps is to control the flow velocity that is fed to the refrigeration agent the crankcase from discharge chamber, to make pressure reduction become the value that equals by the solenoid setting.

Parallel with the discharge capacity control operation of displacement control valve 40, shape memory alloy spring 16 sensings are in the temperature of the refrigeration agent under the discharge pressure Pd.If it is high unusually that this temperature becomes, shape memory alloy spring 16 can make valve member 15 rise from valve seat 14, and the refrigeration agent that will be in discharge pressure Pd under is fed to crankcase, is controlled to be less with the discharge capacity pressure with compressor 1.

Fig. 8 is the central longitudinal sectional view of the displacement control valve of expression seventh embodiment of the invention.In Fig. 8, the composed component identical with the composed component shown in Fig. 2 refers to identical label, and omits its detailed description.

The 7th mode of execution illustrates the embodiment who the temperature control apparatus 10b according to first mode of execution among Fig. 2 is applied to the displacement control valve 50 of the 3rd type.Suction pressure Ps in the suction chamber of displacement control valve 50 sensing variable compressors 1, and control be incorporated into the flow velocity of the refrigeration agent the crankcase from discharge chamber, thereby suction pressure Ps is controlled to be predetermined value.

Displacement control valve 50 comprises: pressure-sensing portion, and it is configured such that by barrier film 51 sensing suction pressure Ps; And valve portion 52, its control is caused the flow velocity that flows to the refrigeration agent of crankcase from discharge chamber.Barrier film 51 is arranged in the load that receives suction pressure Ps on the one surface and accept spring 53 on its another surface.Axially extended axle 54 is arranged between barrier film 51 and the valve portion 52, makes the variation of the suction pressure Ps that sensed by barrier film 51 be delivered to the valve member of valve portion 52 by axle 54.

The main body 55 of valve portion 52 is combined with structure and the temperature control apparatus identical according to the temperature control apparatus 10b of first mode of execution.This temperature control apparatus is arranged on valve portion 52 and is between the port of the port of the refrigeration agent under the discharge pressure Pd and valve portion 52 is controlled to pressure P c so as to conveying refrigeration agent so as to reception.Shape memory alloy spring 16 is arranged on valve portion 52 and is in the passage that the port of the refrigeration agent under the discharge pressure Pd is communicated with, so that sensing is in the temperature of the refrigeration agent under the discharge pressure Pd so as to reception.

In displacement control valve 50, barrier film 51 sensing suction pressure Ps, and valve portion 52 control is fed to the flow velocity of the refrigeration agent of crankcase from discharge chamber make suction pressure Ps become to equal the predetermined value of being determined by spring 53.

Parallel with the discharge capacity control operation of displacement control valve 50, shape memory alloy spring 16 sensings are in the temperature of the refrigeration agent under the discharge pressure Pd.If it is high unusually that this temperature becomes, shape memory alloy spring 16 can make valve member 15 rise from valve seat 14, and the refrigeration agent that will be in discharge pressure Pd under is fed to crankcase, is controlled to be less with the discharge capacity pressure with compressor 1.

Fig. 9 is the central longitudinal sectional view of the displacement control valve of expression eighth embodiment of the invention.In Fig. 9, the composed component identical with the composed component shown in Fig. 3 and Fig. 6 refers to identical label, and omits its detailed description.

The 8th mode of execution shows the embodiment who the temperature control apparatus 10c according to second mode of execution among Fig. 3 is applied to the displacement control valve 60 of the first kind.In this displacement control valve 60, with the shared valve of the valve of temperature control apparatus portion 32.Shape memory alloy spring 16 is arranged on to introduce and is in the chamber of the refrigeration agent under the discharge pressure Pd, is used for opening direction pushing shaft 34 along valve when the temperature of refrigeration agent uprises.

Utilize this structure, when the temperature of the refrigeration agent under being in discharge pressure Pd is not high, do not produce shape memory alloy spring 16 so as to the required sufficient load on spring of live axle 34, so displacement control valve 60 is carried out the discharge capacity control operation that is not subjected to the temperature control apparatus effect.It is unusual when high that the temperature of the refrigeration agent under being in discharge pressure Pd becomes, and shape memory alloy spring 16 senses this temperature and opens direction live axle 34 along valve, thus the valve portion 32 of positive opening displacement control valve 60.Therefore, the discharge capacity of variable compressor 1 is controlled as less.

Figure 10 is the central longitudinal sectional view of the displacement control valve of expression ninth embodiment of the invention.In Figure 10, the composed component identical with the composed component shown in Fig. 6 refers to identical label, and omits its detailed description.

The 9th mode of execution shows the embodiment of the displacement control valve 70 that temperature control apparatus 10b and the 10c according to first and second mode of executions shown in Fig. 2 and Fig. 3 is applied to the first kind.In this displacement control valve 70,, and be used for opening the spring of direction promotion plunger 71 along valve by shape memory alloy spring 16 replacements of temperature control apparatus by solenoid 33 with the shared valve of the valve of temperature control apparatus portion 32.Though the temperature in the shape memory alloy spring 16 sensing solenoids 33, whole displacement control valve 70 is configured to be inserted in the compressor 1, so shape memory alloy spring 16 temperature of sensing compressor 1 in fact.

Utilize this structure, when the temperature of compressor 1 is not high, shape memory alloy spring 16 is used as the spring of solenoid 33 owing to its load on spring changes hardly, but, if it is high unusually that the temperature of compressor 1 becomes, shape memory alloy spring 16 senses this temperature and opens direction drive plunger 71 along valve.This actuation force that makes plunger 71 is delivered to the valve member of valve portion 32 via barrier film 31 and axle 34, and with the valve portion 32 of positive opening displacement control valve 70, the discharge capacity of variable compressor 1 is controlled as less thus.

Figure 11 is the central longitudinal sectional view of the displacement control valve of expression tenth embodiment of the invention.In Figure 11, the composed component identical with the composed component shown in Fig. 3 and Fig. 8 refers to same numeral, and omits its detailed description.

The tenth mode of execution shows the embodiment who the temperature control apparatus 10c according to second mode of execution shown in Fig. 3 is applied to the displacement control valve 80 of the 3rd type.In this displacement control valve 80, with the shared valve of the valve of temperature control apparatus portion 52.Shape memory alloy spring 16 is arranged on for introducing and is in the chamber of the refrigeration agent under the discharge pressure Pd.When the temperature of refrigeration agent uprised, axle 54 was opened direction and is promoted along valve.

Utilize this structure, when the temperature of the refrigeration agent under being in discharge pressure Pd was not high, shape memory alloy spring 16 did not produce the load on spring that is enough to live axle 54, and therefore, displacement control valve 80 is not subjected to temperature control apparatus to make land used and carries out the discharge capacity control operation.It is unusual when high that the temperature of the refrigeration agent under being in discharge pressure Pd becomes, and shape memory alloy spring 16 senses this temperature and opens direction live axle 54 along valve, thus the valve portion 52 of positive opening displacement control valve 80.Thereby the discharge capacity of variable compressor 1 is controlled as less.

Figure 12 is the central longitudinal sectional view of the displacement control valve of expression eleventh embodiment of the invention.In Figure 12, the composed component identical with the composed component shown in Figure 11 refers to same numeral, and omits its detailed description.

The 11 mode of execution shows the embodiment of the displacement control valve 90 that temperature control apparatus 10b and the 10c according to first and second mode of executions shown in Fig. 2 and Fig. 3 is applied to the 3rd type.In this displacement control valve 90, barrier film 51 is replaced by the shape memory alloy spring 16 of temperature control apparatus to the spring that it applies the load on spring that overcomes suction pressure Ps.Though shape memory alloy spring 16 sensings hold the temperature in the housing 91 of spring 16, whole displacement control valve 90 is configured to be inserted in the compressor 1, so shape memory alloy spring 16 temperature of sensing compressor 1 in fact.

Utilize this structure, when the temperature of compressor 1 was not high, because the load on spring of shape memory alloy spring 16 changes hardly, so it was with the spring that acts on the value of setting the suction pressure Ps that makes to be controlled.If it is high unusually that the temperature of compressor 1 becomes, shape memory alloy spring 16 senses this temperature and opens direction live axle 54 via barrier film 51 along valve.This makes the actuation force of axle 54 be delivered to the valve member of valve portion 52, and with the valve portion 52 of positive opening displacement control valve 90, the discharge capacity of variable compressor 1 is controlled as less thus.

Figure 13 is the central longitudinal sectional view of the displacement control valve of expression twelveth embodiment of the invention.In Figure 13, the composed component identical with the composed component shown in Fig. 4 to Fig. 6 refers to same numeral, and omits its detailed description.

The 12 mode of execution shows the embodiment of the displacement control valve 100 that temperature control apparatus 10d and the 10e according to third and fourth mode of execution shown in Fig. 4 and Fig. 5 is applied to the first kind.In this displacement control valve 100, with the shared valve of temperature controlled valve portion 32.Bimetal piece 26 is arranged on for introducing and is in the chamber of the refrigeration agent under the discharge pressure Pd, thereby opens direction pushing shaft 34 along valve when the temperature of refrigeration agent uprises.

Utilize this structure, when the temperature of the refrigeration agent under being in discharge pressure Pd is low, as shown in figure 13, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, and does not carry out the discharge capacity control operation thereby displacement control valve 100 is not subjected to temperature control apparatus to make land used.It is unusual when high that the temperature of the refrigeration agent under being in discharge pressure Pd becomes, and bimetal piece 26 senses this temperature and its shape of reversing, and opens direction pushing shaft 34 along valve, thereby opens displacement control valve 100.This makes that be in refrigeration agent discharge pressure Pd under is fed to crankcase and increases pressure P c in the crankcase, thereby is controlled to be the discharge capacity pressure of variable compressor 1 less.

Figure 14 is the central longitudinal sectional view of the modified example of the displacement control valve of expression twelveth embodiment of the invention.In Figure 14, the composed component identical with the composed component shown in Figure 13 refers to same numeral, and omits its detailed description.

Different with the displacement control valve 100 of the 12 mode of execution of the temperature that is in the refrigeration agent under the discharge pressure Pd according to bimetal piece 26 sensings wherein, be configured such that the temperature that is in the refrigeration agent under the pressure P c in the bimetal piece 26 sensing crankcases according to the displacement control valve 110 of the modified example of the 12 mode of execution.In this displacement control valve 110, bimetal piece 26 is arranged on and is controlled to the refrigeration agent that is under the pressure P c and is transported in the port that crankcase passes through, and promotes the axle 111 integrally formed with the valve member of valve portion 32 so that the temperature of the refrigeration agent under being in pressure P c is opened direction along valve when uprising.

Utilize this structure, when the temperature of the refrigeration agent under being in pressure P c is low, as shown in figure 14, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, and does not carry out the discharge capacity control operation thereby displacement control valve 110 is not subjected to temperature control apparatus to make land used.It is unusual when high that the temperature of the refrigeration agent under being in pressure P c becomes, and bimetal piece 26 senses this temperature and its shape of reversing, and opens direction pushing shaft 111 along valve, thereby opens displacement control valve 110.This makes that be in refrigeration agent discharge pressure Pd under is fed to crankcase and increases pressure P c in the crankcase, thereby is controlled to be the discharge capacity pressure of variable compressor 1 less.

Figure 15 is the central longitudinal sectional view of the displacement control valve of expression the 13 mode of execution.In Figure 15, the composed component identical with the composed component shown in Fig. 4, Fig. 5 and Fig. 7 refers to same numeral, and omits its detailed description.

The 13 mode of execution shows the embodiment of the displacement control valve 120 that temperature control apparatus 10d and the 10e according to third and fourth mode of execution shown in Fig. 4 and Fig. 5 is applied to second type.In this displacement control valve 120, with the shared valve of the valve of temperature control apparatus portion 41.Bimetal piece 26 is arranged on to introduce and is in the chamber of the refrigeration agent discharge pressure Pd under, when uprising with the temperature of convenient refrigeration agent along valve open direction promote with the axle 43 of the valve member that forms valve portion 41 integrally formed spools 121.

Utilize this structure, when the temperature of the refrigeration agent under being in discharge pressure Pd is low, as shown in figure 15, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, and does not carry out the discharge capacity control operation thereby displacement control valve 120 is not subjected to temperature control apparatus to make land used.It is unusual when high that the temperature of the refrigeration agent under being in discharge pressure Pd becomes, and bimetal piece 26 senses this temperature and its shape of reversing, and opens direction pushing shaft 121 along valve, thus positive opening displacement control valve 120.This makes that be in refrigeration agent discharge pressure Pd under is fed to crankcase and increases pressure P c in the crankcase, thereby is controlled to be the discharge capacity pressure of variable compressor 1 less.

Figure 16 is the central longitudinal sectional view of the modified example of the displacement control valve of expression thirteenth embodiment of the invention.In Figure 16, the composed component identical with the composed component shown in Figure 15 refers to same numeral, and omits its detailed description.

Different with the displacement control valve 120 of the 13 mode of execution of the temperature that is in the refrigeration agent under the discharge pressure Pd according to bimetal piece 26 sensings wherein, be configured such that the temperature that is in the refrigeration agent under the pressure P c in the bimetal piece 26 sensing crankcases according to the displacement control valve 130 of the modified example of the 13 mode of execution.In this displacement control valve 130, bimetal piece 26 is arranged on and is controlled to the refrigeration agent that is under the pressure P c and is transported in the port that crankcase passes through, and promotes the axle 43 integrally formed with the valve member of valve portion 52 so that the temperature of the refrigeration agent under being in pressure P c is opened direction along valve when uprising.

Utilize this structure, when the temperature of the refrigeration agent under being in pressure P c is low, as shown in figure 16, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, and does not carry out the discharge capacity control operation thereby displacement control valve 130 is not subjected to temperature control apparatus to make land used.It is unusual when high that the temperature of the refrigeration agent under being in pressure P c becomes, and bimetal piece 26 senses this temperature and its shape of reversing, and opens direction pushing shaft 43 along valve, thus positive opening displacement control valve 130.This makes that be in refrigeration agent discharge pressure Pd under is fed to crankcase and increases pressure P c in the crankcase, thereby is controlled to be the discharge capacity pressure of variable compressor 1 less.

Figure 17 is the central longitudinal sectional view of the displacement control valve of expression fourteenth embodiment of the invention.In Figure 17, the composed component identical with the composed component shown in Fig. 4, Fig. 5 and Fig. 8 refers to same numeral, and omits its detailed description.

The 14 mode of execution shows the embodiment of the displacement control valve 140 that temperature control apparatus 10d and the 10e according to third and fourth mode of execution shown in Fig. 4 and Fig. 5 is applied to the 3rd type.In this displacement control valve 140, with the shared valve of the valve of temperature control apparatus portion 52.Bimetal piece 26 is arranged on to introduce and is in the chamber of the refrigeration agent under the discharge pressure Pd, opens direction pushing shaft 54 along valve when uprising with the temperature of convenient refrigeration agent.

Utilize this structure, when the temperature of the refrigeration agent under being in discharge pressure Pd is low, as shown in figure 17, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, and does not carry out the discharge capacity control operation thereby displacement control valve 140 is not subjected to temperature control apparatus to make land used.It is unusual when high that the temperature of the refrigeration agent under being in discharge pressure Pd becomes, and bimetal piece 26 senses this temperature and its shape of reversing, and opens direction pushing shaft 54 along valve, thus positive opening displacement control valve 140.Therefore, be in refrigeration agent under the discharge pressure Pd and be fed to crankcase and increase pressure P c in the crankcase, thereby force to be controlled to be the discharge capacity of variable compressor 1 less.

Figure 18 is the central longitudinal sectional view of the modified example of the displacement control valve of expression fourteenth embodiment of the invention.In Figure 18, the composed component identical with the composed component shown in Figure 17 refers to same numeral, and omits its detailed description.

Different with the displacement control valve 140 of the 14 mode of execution of the temperature that is in the refrigeration agent under the discharge pressure Pd according to bimetal piece 26 sensings wherein, be configured such that the temperature that is in the refrigeration agent under the pressure P c in the bimetal piece 26 sensing crankcases according to the displacement control valve 150 of the modified example of the 14 mode of execution.In this displacement control valve 150, bimetal piece 26 is arranged on and is controlled to the refrigeration agent that is under the pressure P c and is transported in the port that crankcase passes through, and promotes the axle 151 integrally formed with the valve member of valve portion 52 so that the temperature of the refrigeration agent under being in pressure P c is opened direction along valve when uprising.

Utilize this structure, when the temperature of the refrigeration agent under being in pressure P c is low, as shown in figure 18, the metal side with less thermal expansion coefficient of bimetal piece 26 slightly contacts with stop ring 29 or separates, and does not carry out the discharge capacity control operation thereby displacement control valve 150 is not subjected to temperature control apparatus to make land used.It is unusual when high that the temperature of the refrigeration agent under being in pressure P c becomes, and bimetal piece 26 senses this temperature and its shape of reversing, and opens direction pushing shaft 151 along valve, thus positive opening displacement control valve 150.Therefore, be in refrigeration agent under the discharge pressure Pd and be fed to crankcase and increase pressure P c in the crankcase, thereby force to be controlled to be the discharge capacity of variable compressor 1 less.

In above-mentioned the first to the 14 mode of execution and modified example, described and the so-called embodiment who enters the corresponding temperature control apparatus 10b to 10e of control (let-in control) and be applied to the displacement control valve 30 to 150 of temperature control apparatus, enter in the control described, be incorporated into the flow velocity that is in the refrigeration agent under the discharge pressure Pd in the crankcase is controlled variable compressor 1 with the pressure P c of control in the crankcase discharge capacity by control.Below, the embodiment of the temperature control apparatus of (let-out control) is controlled in description corresponding to so-called discharge, in described discharge control, the flow velocity that is drawn into the refrigeration agent the suction chamber from crankcase by control is controlled the discharge capacity of variable compressor 1 with the pressure P c in the control crankcase.

Figure 19 is a system diagram, shows the refrigeration cycle of application temperature control apparatus that is used for variable compressor of the 15 and the 16 mode of execution according to the present invention.In Figure 19, the composed component identical with the composed component shown in Fig. 1 refers to same numeral, and omits its detailed description.

The variable compressor 1 that is used for refrigeration cycle comprises: be arranged on the hole 8 of the passage between discharge chamber and the crankcase, its compressed refrigerant that is used for being under the discharge pressure Pd is incorporated into crankcase; And be arranged on crankcase and be in temperature control apparatus 10f and displacement control valve 7 in the passage between the suction chamber under the suction pressure Ps, they are used for controlling the flow velocity that can leak into the refrigeration agent of suction chamber from crankcase.

Temperature in the temperature control apparatus 10f sensing variable compressor 1.Temperature control apparatus 10f is not higher than in the temperature that senses under the normal state of predetermined temperature and does not work, but, when the temperature that senses becomes when being higher than predetermined temperature, temperature control apparatus 10f forces to control the discharge capacity of variable compressor 1 changeably, makes discharge capacity diminish.Temperature control apparatus 10f is independent of displacement control valve 7 operations.

When displacement control valve 7 is controlled compressor 1 changeably,, uprise from the temperature of the refrigeration agent of discharge chamber discharging if for example refrigeration load is higher and compressor 1 continues with the maximum pump discharge operation.When the temperature of refrigeration agent of discharging uprises and when making temperature in the compressor 1 be higher than predetermined temperature, temperature control apparatus 10f work is to reduce the flow velocity that can release the refrigeration agent the suction chamber from crankcase, thereby the pressure P c in the increase crankcase, the discharge capacity with compressor 1 is controlled to be less thus.As a result, owing to reduce from the temperature of the refrigeration agent of compressor 1 discharging, thereby prevent that becoming with the temperature of refrigeration agent circuit lubricant oil of compressor 1 is higher than its permissible temperature in whole refrigeration cycle, this can prevent the lubricant oil thermal degradation.

It should be noted that, though in said system, because refrigeration agent is introduced directly into crankcase from discharge chamber, therefore the temperature in the crankcase approaches the temperature in the discharge chamber, so temperature control apparatus 10f is arranged in the passage between crankcase and the displacement control valve 7, and use the refrigeration agent of taking from crankcase to carry out the high temperature sensing, but this is not restrictive.Temperature control apparatus 10f can be arranged in the passage between displacement control valve 7 and the suction chamber, so that the temperature of the refrigeration agent that sensing compressor 1 sucks, thereby determines the temperature of the refrigeration agent that heats up because of compression indirectly.

Figure 20 is the central longitudinal sectional view according to the structure of the temperature control apparatus that is used for variable compressor of fifteenth embodiment of the invention.

Have the crankcase that is arranged on variable compressor 1 and the cylinder-shaped body 161 in the passage between the displacement control valve 7 according to the temperature control apparatus 10g of the 15 mode of execution.One end of main body 161 is formed with and the inlet 162 that starts from the channel connection of crankcase, and the other end of main body 161 is formed with and the outlet 163 of leading to the channel connection of displacement control valve 7.Inlet 162 and export to be formed with between 163 and be used to passage that refrigeration agent is passed through.The middle body of this passage is formed with the stepped part that is used to form valve seat 164.Valve member 165 is arranged on the inlet side of valve seat 164, make valve member 165 can towards with away from valve seat 164 motion.In addition, the inlet side of valve member 165 is provided with and is used for opening the tapered shape memory alloy spring 166 that direction promotes valve member 165 along valve, and the outlet side of valve member 165 is provided with the wind spring 167 that is used for opening along valve direction promotion valve member 165.In this case, valve seat 164, valve member 165 and wind spring 167 form the normally open valve that opens and closes by shape memory alloy spring 166.For this reason, the load on spring of shape memory alloy spring 166 and wind spring 167 is adjusted by being screwed into the adjustment screw 168 of inlet in 162, makes valve member 165 not be higher than in the temperature from the refrigeration agent of crankcase under the normal state of predetermined temperature and opens fully.

According to by as the temperature control apparatus 10g of above-mentioned structure, when lower and variable compressor 1 continued to work with minimum injection rate or in the excursion of discharge capacity when refrigeration load, it is high unusually that the temperature of the refrigeration agent in the crankcase can not become.Therefore, the load on spring of shape memory alloy spring 166 that has sensed the refrigerant temperature in the crankcase is less, and therefore temperature control apparatus 10g keeps full open position.

On the other hand, when higher and variable compressor 1 continues to work with maximum pump discharge when refrigeration load, make temperature anomaly height from the refrigeration agent of crankcase, it is big that the load on spring of shape memory alloy spring 166 becomes, thereby cause spring 166 to overcome the Driving force of wind spring 167 and extend, valve member 165 is sat and is put on valve seat 164 and closing temperature control gear 10g thus.As a result, owing to the mobile pressure P c that stops to increase in the crankcase from the refrigeration agent of crankcase, thereby compressor 1 is forced to be controlled to and makes its discharge capacity reduce, and this has reduced the temperature that is in the refrigeration agent under the discharge pressure Pd.The temperature of the refrigeration agent under being in discharge pressure Pd reduces and when refrigerant temperature in the crankcase was reduced, control gear 10g opened and makes compressor 1 be subjected to displacement control valve 7 controls.

Figure 21 is the central longitudinal sectional view according to the structure of the temperature control apparatus that is used for variable compressor of sixteenth embodiment of the invention.In Figure 21, the composed component identical with the composed component shown in Figure 20 refers to same numeral, and omits its detailed description.

Different with the use shape memory alloy spring 166 according to the 15 mode of execution shown in Figure 20 as the temperature control apparatus 10g of heat-sensitive actuating device, use bimetal piece 169 as the heat-sensitive actuating device according to the temperature control apparatus 10h of the 16 mode of execution.The periphery pine of bimetal piece 169 be assemblied in by be formed on inlet in 162 stepped part and be assemblied in the groove that the hollow cylinder 170 in the inlet 162 forms.The interior week of bimetal piece 169 engages with being assemblied in from the stop ring 172 of valve member 165 on inlet 162 axially extended axles 171.

According to temperature control apparatus 10h as above structure, when in variable compressor 1 continues with minimum injection rate or the excursion in discharge capacity, working, the temperature of the refrigeration agent in the crankcase is lower, therefore as shown in figure 21, the metal side with less thermal expansion coefficient of bimetal piece 169 slightly contacts with stop ring 172 or separates, and temperature control apparatus 10h stays open thus.

When the temperature of the refrigeration agent in the crankcase uprised, bimetal piece 169 utilized its periphery as support and towards valve member 165 bendings, was applied to the load on spring increase along the valve closing direction of axle 171 thus via stop ring 172.When the temperature of the refrigeration agent in the crankcase becomes unusual when high, the shape reverse of bimetal piece 169 then the Driving force that overcomes wind spring 167 be along valve closing direction pushing shaft 171, and valve member 165 is sat put on valve seat 164, thus closing temperature control gear 10h.This makes and to increase pressure P c in the crankcase from mobile the stopping of the refrigeration agent of crankcase, diminishes thereby variable compressor 1 is forced to be controlled to its discharge capacity.

The temperature control apparatus that is used for variable compressor according to the present invention is configured to force its discharge capacity is reduced when the temperature of compressor becomes too high.The temperature of the refrigeration agent that this can suppress to discharge raises.

When the heat-sensitive actuating device is configured to direct sensing from the temperature of the refrigeration agent of discharge chamber discharging, can promote the responsiveness of heat-sensitive actuating device, and the temperature that shortens refrigeration agent after reducing, the discharge capacity of compressor 1 is returned the required time of normal range (NR) with respect to temperature variation.

Though having, some traditional variable compressors are arranged on its lip-deep thermostat to realize preventing the Safety function of high temperature refrigerant, make the compressor control device control the temperature of refrigeration agent according to the temperature that senses, but described temperature control apparatus has identical functions, and the heat-sensitive actuating device is control valve mechanically, therefore can need not the possibility that the component parts such as thermostat just can be suppressed the refrigeration agent intensification of discharging effectively.

In addition, though some traditional variable compressors have the pressure release valve that is arranged to independent component and has the Safety function that prevents high pressure, owing to can temperature control apparatus be had and the pressure release valve identical functions by the load on spring of adjusting valve, therefore can save pressure release valve.

It only is the illustration of the principle of the invention that aforementioned content is considered as.In addition, because those skilled in the art can be easy to expect multiple variants and modifications, thereby do not expect the present invention is limited to definite structure and the application that illustrates and describe, so all modification that are fit to and equivalent can be considered as dropping in the invention scope in claims and the equivalent thereof.

Claims

1, a kind of temperature control apparatus that is used for variable compressor, this temperature control apparatus comprises:

Valve, described valve is arranged in the described variable compressor, is used for controlling the pressure of the crankcase of this compressor; And

The heat-sensitive actuating device, described heat-sensitive actuating device detects the temperature in the described compressor, activates described valve along the direction that increases the pressure in the described crankcase when being higher than predetermined temperature to become in this temperature.

2, temperature control apparatus according to claim 1, this temperature control apparatus is arranged in the discharge chamber and the passage between the crankcase of described compressor, and the normal close type valve of wherein said valve for opening when described heat-sensitive actuating device senses the temperature that is higher than described predetermined temperature.

3, temperature control apparatus according to claim 2, wherein, described valve comprises: be formed on the inlet on described valve and the side that described discharge chamber is communicated with; Be formed on the outlet on described valve and the side that described crankcase is communicated with; Be formed at the valve seat in the passage that between described inlet and described outlet, is communicated with; With can be towards being arranged on valve member on the outlet side of described valve seat with mode away from the motion of described valve seat; And be arranged on wind spring on the outlet side of described valve member, this wind spring is used for promoting described valve member along the valve closing direction, wherein said heat-sensitive actuating device is arranged on the inlet side of described valve seat, is used for when described heat-sensitive actuating device senses the temperature that is higher than described predetermined temperature promoting described valve member and opening described valve member by open direction along valve.

4, temperature control apparatus according to claim 3, wherein, described valve comprises the pressure-sensing piston that is connected to described valve member via valve opening, the external diameter of described pressure-sensing piston is substantially equal to the internal diameter of described valve opening, make that the pressure identical with the pressure in the described outlet acts on described pressure-sensing piston with described valve member opposing end faces on.

5, temperature control apparatus according to claim 3, wherein, described heat-sensitive actuating device is a shape memory alloy spring, when described heat-sensitive actuating device senses the temperature that is higher than described predetermined temperature, opens the load on spring that direction promotes described valve member along valve and sharply increases.

6, temperature control apparatus according to claim 3, wherein, described heat-sensitive actuating device is a bimetal piece, when described heat-sensitive actuating device senses the temperature that is higher than described predetermined temperature, this bimetal piece is towards its metal side bending with less thermal expansion coefficient, is used to make open the load on spring that direction promotes described valve member along valve and sharply increase.

7, temperature control apparatus according to claim 3, this temperature control apparatus is combined in and is arranged on being used in the compressor and controls the valve portion of the displacement control valve of compressor displacement, make the valve portion collateral action of described temperature control apparatus and described displacement control valve, the control of described valve portion flows to the flow velocity of the refrigeration agent of described crankcase from described discharge chamber.

8, temperature control apparatus according to claim 3, this temperature control apparatus is combined in and is arranged on being used in the compressor and controls the valve portion of the displacement control valve of compressor displacement, the control of described valve portion flows to the flow velocity of the refrigeration agent of described crankcase from described discharge chamber, wherein said displacement control valve and the shared valve of described valve portion, and wherein said heat-sensitive actuating device be arranged on first chamber that is communicated with described discharge chamber of described valve portion and described valve portion with second chamber that described crankcase is communicated with at least one in.

9, temperature control apparatus according to claim 5, this temperature control apparatus is combined in the displacement control valve that is arranged in the described compressor, described displacement control valve is used for making the suction pressure of suction chamber of described compressor equal the discharge capacity that setting pressure is controlled described compressor by the flow velocity that control flows to the refrigeration agent of described crankcase from described discharge chamber, and wherein said displacement control valve and the shared valve of described valve portion, and wherein said shape memory alloy spring promotes the spring of plunger and is arranged on a solenoid as being used for opening direction along valve, and described solenoid is used to set the value of the described suction pressure of making to be controlled.

10, temperature control apparatus according to claim 5, this temperature control apparatus is combined in the displacement control valve that is arranged in the described compressor, described displacement control valve is used for making the suction pressure of suction chamber of described compressor equal the discharge capacity that setting pressure is controlled described compressor by the flow velocity that control flows to the refrigeration agent of described crankcase from described discharge chamber, and wherein said displacement control valve and the shared valve of described valve portion, and wherein said shape memory alloy spring is arranged in the pressure-sensing portion of value of the described suction pressure of sensing, open the spring that direction promotes described valve member as being used for along valve, thereby set the value of the described suction pressure of making to be controlled.

11, temperature control apparatus according to claim 1, this temperature control apparatus is arranged in the described crankcase and the passage that is provided with displacement control valve between the suction chamber of described compressor, and wherein said valve is the normally open valve of cutting out when described heat-sensitive actuating device senses the temperature that is higher than described predetermined temperature.

12, temperature control apparatus according to claim 11, wherein, described valve comprises: be formed on the inlet on described valve and the side that described crankcase is communicated with; Be formed on the outlet on described valve and the side that described suction chamber is communicated with; Be formed at the valve seat in the passage that between described inlet and described outlet, is communicated with; With can be towards being arranged on valve member on the inlet side of described valve seat with mode away from the motion of described valve seat; And be arranged on wind spring on the outlet side of described valve member, this wind spring is used for opening direction along valve and promotes described valve member, and wherein said heat-sensitive actuating device is arranged on the shape memory alloy spring on the described inlet side of described valve seat, is used for described valve member being sat put at described valve seat by sharply increase its load on spring when described heat-sensitive actuating device senses the temperature that is higher than described predetermined temperature.

13, temperature control apparatus according to claim 11, wherein, described valve comprises: be formed on the inlet on described valve and the side that described crankcase is communicated with; Be formed on the outlet on described valve and the side that described suction chamber is communicated with; Be formed at the valve seat in the passage that between described inlet and described outlet, is communicated with; With can be towards being arranged on valve member on the inlet side of described valve seat with mode away from the motion of described valve seat; And be arranged on wind spring on the outlet side of described valve member, this wind spring is used for opening direction along valve and promotes described valve member, and wherein said heat-sensitive actuating device is a bimetal piece, this bimetal piece is being arranged so that on the described inlet side of described valve seat when described heat-sensitive actuating device senses the temperature that is higher than described predetermined temperature, described bimetal piece is to its metal side bending with less thermal expansion coefficient, thereby sharply increase its load on spring, cause described valve member to be sat and put on described valve seat.