CN103499156B - The control method of high-low-temperature environmental testing case - Google Patents
The control method of high-low-temperature environmental testing case Download PDFInfo
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- CN103499156B CN103499156B CN201310440212.7A CN201310440212A CN103499156B CN 103499156 B CN103499156 B CN 103499156B CN 201310440212 A CN201310440212 A CN 201310440212A CN 103499156 B CN103499156 B CN 103499156B
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Abstract
The invention discloses a kind of control method of high-low-temperature environmental testing case, the control method of this high-low-temperature environmental testing case comprises the following steps: control device is according to the on off state of the temperature adjustment control valve of the pilot region inside of casing; Control valve is in off-state and works as the temperature T of pilot region inside
ahigher than design temperature T
btime, control device sends connection signal to control valve, and control valve is connected, until the temperature of pilot region inside reaches T
bduring+Δ T, control device sends cut-off signal to control valve, and control valve disconnects, described T
b+ Δ T < T
a; Control valve is in on-state and works as the temperature T of pilot region inside
alower than design temperature T
btime, control device sends cut-off signal to control valve, and control valve disconnects, until the temperature of pilot region inside reaches T
bduring-Δ T, control device sends connection signal to control valve, and control valve is connected, T
b-Δ T > T
a, the cold that high-low-temperature environmental testing refrigeration case is produced is fully utilized, and can not cause the waste of energy, reduce energy consumption, save the energy.
Description
Technical field
The present invention relates to high-low-temperature environmental testing box technology field, particularly relate to the control method of high-low-temperature environmental testing case.
Background technology
High-low-temperature environmental testing equipment is usually used in carrying out environmental adaptability development test to material product, general high-low-temperature environmental testing equipment controls high-low-temperature environmental testing equipment test temperature by arranging heater, this temperature is made to be tending towards design temperature, when high-low-temperature environmental testing equipment semen donors be greater than actual demand cause test temperature lower than design temperature time, test temperature is made to reach design temperature by the heating of heater, adopt in this way, equipment energy consumption is caused to increase a lot, the cost increased, does not meet this aim of energy-saving and emission-reduction that country proposes yet.
Summary of the invention
The object of the present invention is to provide a kind of high-low-temperature environmental testing refrigeration system of low energy consumption.
A further object of the invention is the high-low-temperature environmental testing case providing a kind of low energy consumption.
Another object of the present invention is to provide a kind of control method realizing the low energy consumption of high-low-temperature environmental testing case and run.
In order to realize object of the present invention, the technical scheme taked is:
A kind of high-low-temperature environmental testing refrigeration system, comprise the controller of low-temperature level compressor, evaporimeter, control valve, condenser/evaporator, high-temperature level compressor, condenser, control and regulation threshold switch state, low-temperature level compressor, evaporimeter, control valve, condenser/evaporator are connected in series formation low-temperature circuit by pipeline, high-temperature level compressor, condenser, condenser/evaporator are connected in series formation high-temperature circuit by pipeline, and low-temperature circuit and high-temperature circuit are in parallel.
Low-temperature circuit adopts low-temperature refrigerant, and high-temperature circuit adopts high temperature refrigerant.Condenser/evaporator as the condenser of low-temperature circuit simultaneously as the evaporimeter of high-temperature circuit, evaporimeter in low-temperature circuit is from Experimental Area draw heat, and this heat is brought in condenser/evaporator the most at last, in condenser/evaporator, the high temperature refrigerant of high-temperature circuit part evaporates thus takes in high-temperature circuit by this heat, high temperature refrigerant after temperature raises arrives in the condenser of high-temperature circuit lowers the temperature, and this heat is delivered in water or air the most at last.Controller sends control signal to control valve, and the ON/OFF state of control and regulation valve, when control valve is connected, low-temperature circuit normally works, and evaporimeter, from draw heat in pilot region, is lowered the temperature to pilot region, when control valve disconnects, low-temperature circuit no longer works.In this way, the cold that high-low-temperature environmental testing refrigeration system is produced is fully utilized, and can not cause the waste of energy, reduce energy consumption, save the energy.
Below technical scheme is further illustrated:
Preferably, described control valve is magnetic valve or electric expansion valve.Magnetic valve or electric expansion valve long service life.
Preferably, described control valve is this Polish magnetic valve.Because the temperature in pilot region fluctuates up and down at set temperature value annex always, therefore, the switching frequency of control valve is higher, and this Polish magnetic valve can be applicable to long-time frequent flash.
Preferably, described controller is PID controller.
Preferably, described controller model is TEMI2000 Series Controller.
Preferably, high-low-temperature environmental testing refrigeration system also comprises expansion drum and pressure-control valve, and expansion drum and pressure-control valve are connected in series, and low-temperature level compressor is with expansion drum and pressure-control valve phase and connect.When high-low-temperature environmental testing refrigeration system is out of service, low-temperature refrigerant temperature in low-temperature circuit can rise to environment temperature, thus change into steam, air pressure in loop is caused to raise, by opening pressure-control valve, part steam can enter into expansion drum, thus reduces the air pressure of low-temperature circuit, ensure that the safe handling in loop.High-low-temperature environmental testing refrigeration system is when normally using, if low-temperature circuit air pressure exceedes setting value, also can open pressure-control valve, and low-temperature circuit air pressure is declined.
Preferably, high-low-temperature environmental testing refrigeration system also comprises the first hot gas bypass valve, and the first hot gas bypass valve is with low-temperature level compressor phase and connect.After the existence of the first hot gas bypass valve is used for preventing low-temperature level compressor air suction, temperature is too high, plays a protective role to low-temperature level compressor.
Preferably, high-low-temperature environmental testing refrigeration system also comprises the second hot gas bypass valve, and the second hot gas bypass valve is with high-temperature level compressor phase and connect.After the existence of the second hot gas bypass valve is used for preventing high-temperature level compressor air suction, temperature is too high, plays a protective role to high-temperature level compressor.
The present invention also provides a kind of high-low-temperature environmental testing case, comprise casing, above-mentioned high-low-temperature environmental testing refrigeration system, described casing comprises control area, refrigerated area, pilot region, pilot region is provided with can the hermatic door of folding, control device is equipped with in control area, high-low-temperature environmental testing refrigeration system is installed in refrigerated area, and control device and high-low-temperature environmental testing refrigeration system are electrically connected.
In high-low-temperature environmental testing case, the refrigerating capacity produced due to high-low-temperature environmental testing refrigeration system is fully utilized, and whole high-low-temperature environmental testing case energy consumption is reduced, and save the energy, different devices is arranged at different regions, is convenient to maintenance and checks.
Preferably, described bottom half is provided with castor and/or feet.The effect of the castor of bottom half casing is moved be more prone to, and the effect of feet is that casing is placed more firm.
Preferably, described castor quantity is at least 3.
Preferably, the quantity of described feet is at least 3.
The present invention also provides a kind of control method of above-mentioned high-low-temperature environmental testing case, comprises the following steps:
Control device is according to the on off state of the temperature adjustment control valve of the pilot region inside of casing;
Control valve is in off-state and works as the temperature T of pilot region inside
ahigher than design temperature T
btime, control device sends connection signal to control valve, and control valve is connected, until the temperature of pilot region inside reaches T
bduring+Δ T, control device sends cut-off signal to control valve, and control valve disconnects, described T
b+ Δ T < T
a;
Control valve is in on-state and works as the temperature T of pilot region inside
alower than design temperature T
btime, control device sends cut-off signal to control valve, and control valve disconnects, until the temperature of pilot region inside reaches T
bduring-Δ T, control device sends connection signal to control valve, and control valve is connected, T
b-Δ T > T
a.
When the temperature of pilot region inside is higher than design temperature, control valve is connected, high-low-temperature environmental testing refrigeration system works, lower the temperature to pilot region, when pilot region internal temperature is close or when reaching design temperature, control valve disconnects, and better can utilize the refrigerating capacity that high-low-temperature environmental testing refrigeration system produces like this, reduce energy consumption, economize energy.When pilot region internal temperature is lower than design temperature, control valve disconnects, and high-low-temperature environmental testing refrigeration system quits work, and can avoid like this wasting the more energy, thus reduce energy consumption.
Preferably, Δ T sets according to actual needs.
Preferably, out of service in high-low-temperature environmental testing refrigeration system, and the temperature when pilot region inside reaches T
ctime, pressure-control valve is connected, and expansion drum starts to hold steam; When high-low-temperature environmental testing refrigeration system is run, when low-temperature level compressor high side pressure is greater than setting value, pressure-control valve is connected, and expansion drum starts to hold steam.Well to system decompression, can ensure that security of system uses in this way.
Advantage of the present invention is:
In high-low-temperature environmental testing refrigeration system of the present invention, low-temperature circuit adopts low-temperature refrigerant, and high-temperature circuit adopts high temperature refrigerant.Condenser/evaporator as the condenser of low-temperature circuit simultaneously as the evaporimeter of high-temperature circuit, evaporimeter in low-temperature circuit is from Experimental Area draw heat, and this heat is brought in condenser/evaporator the most at last, in condenser/evaporator, the high temperature refrigerant of high-temperature circuit part evaporates thus takes in high-temperature circuit by this heat, high temperature refrigerant after temperature raises arrives in the condenser of high-temperature circuit lowers the temperature, and this heat is delivered in water or air the most at last.Controller sends control signal to control valve, and the ON/OFF state of control and regulation valve, when control valve is connected, low-temperature circuit normally works, and evaporimeter, from draw heat in pilot region, is lowered the temperature to pilot region, when control valve disconnects, low-temperature circuit no longer works.In this way, the cold that high-low-temperature environmental testing refrigeration system is produced is fully utilized, and can not cause the waste of energy, reduce energy consumption, save the energy.
In high-low-temperature environmental testing case of the present invention, the refrigerating capacity produced due to high-low-temperature environmental testing refrigeration system is fully utilized, and whole high-low-temperature environmental testing case energy consumption is reduced, saves the energy, different devices is arranged at different regions, is convenient to maintenance and checks.
In refrigerating method of the present invention, when the temperature of pilot region inside is higher than design temperature, control valve is connected, high-low-temperature environmental testing refrigeration system work, to pilot region cooling, when pilot region internal temperature close to or when reaching design temperature, control valve disconnects, better can utilize the refrigerating capacity that high-low-temperature environmental testing refrigeration system produces like this, reduce energy consumption, economize energy.When pilot region internal temperature is lower than design temperature, control valve disconnects, and high-low-temperature environmental testing refrigeration system quits work, and can avoid like this wasting the more energy, thus reduce energy consumption.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of high-low-temperature environmental testing refrigeration system of the present invention;
Fig. 2 is the front view of high-low-temperature environmental testing case of the present invention;
Fig. 3 is the side view of Fig. 2.
Description of reference numerals:
100. casings, 101. pilot regions, 102. refrigerated areas, 103. control areas, 104. castors, 105. feets, 106. hermatic doors, 200. magnetic valves, 301. low-temperature level compressors, 302. high-temperature level compressors, 400. low-temperature circuits, 500. high-temperature circuit, 600. expansion valves, 700. filters, 801. first hot gas bypass valves, 802. second hot gas bypass valves, 900. pressure-control valves.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail:
As shown in Figure 1, in an embodiment of the present invention, a kind of high-low-temperature environmental testing refrigeration system, comprise the controller of low-temperature level compressor 301, evaporimeter, control valve, condenser/evaporator, high-temperature level compressor 302, condenser, control and regulation threshold switch state, low-temperature level compressor 301, evaporimeter, control valve, condenser/evaporator are connected in series by pipeline and form low-temperature circuit 400, high-temperature level compressor 302, condenser, condenser/evaporator are connected in series by pipeline and form high-temperature circuit 500, and low-temperature circuit 400 and high-temperature circuit 500 are in parallel.In other embodiments, also comprise forecooler, oil eliminator, filter, low-temperature level compressor 301, forecooler, oil eliminator are in series, filter is two, and two filters are linked into the exit of the exit of the condenser/evaporator of low-temperature circuit 400 and the condenser of high-temperature circuit 500 respectively.
Low-temperature circuit 400 adopts low-temperature refrigerant, and high-temperature circuit 500 adopts high temperature refrigerant.Condenser/evaporator as the condenser of low-temperature circuit 400 simultaneously as the evaporimeter of high-temperature circuit 500, evaporimeter in low-temperature circuit 400 is from Experimental Area draw heat, and this heat is brought in condenser/evaporator the most at last, in condenser/evaporator, the high temperature refrigerant of high-temperature circuit 500 part evaporates thus takes in high-temperature circuit by this heat, high temperature refrigerant after temperature raises arrives in the condenser of high-temperature circuit lowers the temperature, and this heat is delivered in water or air the most at last.Controller sends control signal to control valve, and the ON/OFF state of control and regulation valve, when control valve is connected, low-temperature circuit 400 normally works, and evaporimeter, from draw heat in pilot region, is lowered the temperature to pilot region, when control valve disconnects, low-temperature circuit 400 no longer works.In this way, the cold that high-low-temperature environmental testing refrigeration system is produced is fully utilized, and can not cause the waste of energy, reduce energy consumption, save the energy.
In the present embodiment, described control valve is magnetic valve 200, and this magnetic valve 200 is this Polish magnetic valve, and in other implement, described control valve can also be electric expansion valve.
Controller is PID controller, and preferably model is TEMI2000 Series Controller.
High-low-temperature environmental testing refrigeration system also comprises expansion drum and pressure-control valve, and expansion drum and pressure-control valve 900 are connected in series, and low-temperature level compressor 301 is with expansion drum and pressure-control valve 900 phase and connect.When high-low-temperature environmental testing refrigeration system is out of service, low-temperature refrigerant temperature in low-temperature circuit 400 can rise to environment temperature, thus change into steam, air pressure in loop is caused to raise, by opening pressure-control valve 900, part steam can enter into expansion drum, thus reduces the air pressure of low-temperature circuit, ensure that the safe handling in loop.High-low-temperature environmental testing refrigeration system, when normally using, if low-temperature circuit 400 air pressure exceedes setting value, also can open pressure-control valve 900, and low-temperature circuit air pressure is declined.
High-low-temperature environmental testing refrigeration system also comprises first hot gas bypass valve 801, second hot gas bypass valve 802, first hot gas bypass valve 801 with low-temperature level compressor 301 phase and connects, and the second hot gas bypass valve 802 is with high-temperature level compressor 302 phase and connect.After the existence of the first hot gas bypass valve 801 is used for preventing low-temperature level compressor 301 air-breathing, temperature is too high, plays a protective role to low-temperature level compressor 301.After the existence of the second hot gas bypass valve 802 is used for preventing high-temperature level compressor 302 air-breathing, temperature is too high, plays a protective role to high-temperature level compressor 302.
As shown in Figure 2,3, the present invention also provides a kind of high-low-temperature environmental testing case, comprise casing 100, above-mentioned high-low-temperature environmental testing refrigeration system, described casing 100 comprises control area 103, refrigerated area 102, pilot region 101, pilot region 101 is provided with can the hermatic door 106 of folding, control device is equipped with in control area 103, and high-low-temperature environmental testing refrigeration system is installed in refrigerated area 102, and control device and high-low-temperature environmental testing refrigeration system are electrically connected.
In high-low-temperature environmental testing case, the refrigerating capacity produced due to high-low-temperature environmental testing refrigeration system is fully utilized, and whole high-low-temperature environmental testing case energy consumption is reduced, and save the energy, different devices is arranged at different regions, is convenient to maintenance and checks.
In the present embodiment, castor 104 and feet 105 is provided with bottom described casing 100.The effect of the castor 104 bottom casing 100 casing is moved be more prone to, and the effect of feet 105 is that casing 100 is placed more firm.Castor 104 quantity is at least 3, and the quantity of feet 105 is at least 3.In other embodiments, only can also be provided with castor or only be provided with feet.
The present invention also provides a kind of control method of above-mentioned high-low-temperature environmental testing case, comprises the following steps:
Control device is according to the on off state of the temperature adjustment control valve of pilot region 101 inside of casing 100;
Control valve is in off-state and works as the temperature T of pilot region 101 inside
ahigher than design temperature T
btime, control device sends connection signal to control valve, and control valve is connected, until the temperature of pilot region 101 inside reaches T
bduring+Δ T, control device sends cut-off signal to control valve, and control valve disconnects, described T
b+ Δ T < T
a;
Control valve is in on-state and works as the temperature T of pilot region 101 inside
alower than design temperature T
btime, control device sends cut-off signal to control valve, and control valve disconnects, until the temperature of pilot region 101 inside reaches T
bduring-Δ T, control device sends connection signal to control valve, and control valve is connected, T
b-Δ T > T
a.
Δ T sets according to actual needs.
When the temperature of pilot region 101 inside is higher than design temperature, control valve is connected, high-low-temperature environmental testing refrigeration system works, lower the temperature to pilot region, when pilot region 101 internal temperature is close or when reaching design temperature, control valve disconnects, and better can utilize the refrigerating capacity that high-low-temperature environmental testing refrigeration system produces like this, reduce energy consumption, economize energy.When pilot region 101 internal temperature is lower than design temperature, control valve disconnects, and high-low-temperature environmental testing refrigeration system quits work, and can avoid like this wasting the more energy, thus reduce energy consumption.
Out of service in high-low-temperature environmental testing refrigeration system, and the temperature when pilot region 101 inside reaches T
ctime, pressure-control valve 900 is connected, and expansion drum starts to hold steam; When high-low-temperature environmental testing refrigeration system is run, when low-temperature level compressor 301 high side pressure is greater than setting value, pressure-control valve 900 is connected, and expansion drum starts to hold steam.Well to system decompression, can ensure that security of system uses in this way.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. the control method of a high-low-temperature environmental testing case, it is characterized in that, described high-low-temperature environmental testing case comprises casing, high-low-temperature environmental testing refrigeration system, described casing comprises control area, refrigerated area, pilot region, pilot region is provided with can the hermatic door of folding, control device is equipped with in control area, high-low-temperature environmental testing refrigeration system is installed in refrigerated area, control device and high-low-temperature environmental testing refrigeration system are electrically connected, described high-low-temperature environmental testing refrigeration system comprises low-temperature level compressor, evaporimeter, control valve, condenser/evaporator, high-temperature level compressor, condenser, the controller of control and regulation threshold switch state, low-temperature level compressor, evaporimeter, control valve, condenser/evaporator is connected in series formation low-temperature circuit by pipeline, high-temperature level compressor, condenser, condenser/evaporator is connected in series formation high-temperature circuit by pipeline, low-temperature circuit and high-temperature circuit are in parallel,
Described control method comprises the following steps:
Control device is according to the on off state of the temperature adjustment control valve of the pilot region inside of casing;
Control valve is in off-state and works as the temperature T of pilot region inside
ahigher than design temperature T
btime, control device sends connection signal to control valve, and control valve is connected, until the temperature of pilot region inside reaches T
bduring+Δ T, control device sends cut-off signal to control valve, and control valve disconnects, described T
b+ Δ T < T
a;
Control valve is in on-state and works as the temperature T of pilot region inside
alower than design temperature T
btime, control device sends cut-off signal to control valve, and control valve disconnects, until the temperature of pilot region inside reaches T
bduring-Δ T, control device sends connection signal to control valve, and control valve is connected, T
b-Δ T > T
a.
2. the control method of high-low-temperature environmental testing case according to claim 1, is characterized in that,
Out of service in high-low-temperature environmental testing refrigeration system, and the temperature when pilot region inside reaches T
ctime, pressure-control valve is connected, and expansion drum starts to hold steam;
When high-low-temperature environmental testing refrigeration system is run, when low-temperature level compressor high side pressure is greater than setting value, pressure-control valve is connected, and expansion drum starts to hold steam.
3. the control method of high-low-temperature environmental testing case according to claim 1, is characterized in that, described control valve is magnetic valve or electric expansion valve.
4. the control method of high-low-temperature environmental testing case according to claim 1, is characterized in that, described controller is PID controller.
5. the control method of high-low-temperature environmental testing case according to claim 1, it is characterized in that, described high-low-temperature environmental testing refrigeration system also comprises expansion drum and pressure-control valve, and expansion drum and pressure-control valve are connected in series, and low-temperature level compressor is with expansion drum and pressure-control valve phase and connect.
6. the control method of the high-low-temperature environmental testing case according to any one of claim 3-5, is characterized in that, described high-low-temperature environmental testing refrigeration system also comprises the first hot gas bypass valve, and the first hot gas bypass valve is with low-temperature level compressor phase and connect.
7. the control method of the high-low-temperature environmental testing case according to any one of claim 3-5, is characterized in that, described high-low-temperature environmental testing refrigeration system also comprises the second hot gas bypass valve, and the second hot gas bypass valve is with high-temperature level compressor phase and connect.
8. the control method of high-low-temperature environmental testing case according to claim 1, is characterized in that, described bottom half is provided with castor and/or feet.
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