CN201476387U - High-precision thermostatic cooling-water machine - Google Patents
High-precision thermostatic cooling-water machine Download PDFInfo
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- CN201476387U CN201476387U CN2009201345460U CN200920134546U CN201476387U CN 201476387 U CN201476387 U CN 201476387U CN 2009201345460 U CN2009201345460 U CN 2009201345460U CN 200920134546 U CN200920134546 U CN 200920134546U CN 201476387 U CN201476387 U CN 201476387U
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Abstract
The utility model belongs to the field of thermostatic equipment, and provides a high-precision thermostatic cooling-water machine, which comprises a compressor, a condenser, a drying filter, an electronic expansion valve, an energy adjusting valve, a plate heat exchanger, a water tank, a water pump, a temperature sensor, a solid state relay and a PID controller. The thermostatic cooling water machine adopts the energy adjusting valve on a by-pass circulation loop to replace the prior solenoid valve, then transfers temperature signals fed back by the temperature sensor to the PID controller, and converts pulse signals with different duty ratios generated by the PID controller into switching signals through the solid state relay to control the open and the close of electronic expansion valve, thereby guaranteeing a constant water temperature in the water tank and ensuring that the temperature is less than or equal to 0.1 DEG C; and the machine can run stably for a long time, and is very suitable for being used in precise instruments which have higher requirements for water temperature.
Description
Technical field
The utility model belongs to the thermostatic equipment field, relate in particular to a kind of accuracy of temperature control at ± 0.1 ℃ with interior high accuracy constant temperature cooling-water machine.
Background technology
The structure of existing cooling-water machine as shown in Figure 1, it is mainly by compressor 1, condenser 2, device for drying and filtering 3, magnetic valve 4, throttling arrangement 5, evaporimeter 6 and bypass magnetic valve 7 constitute, the output of compressor 1 is connected with the input pipeline of condenser 2, the output of condenser 2 is connected with the input pipeline of device for drying and filtering 3, the output of device for drying and filtering 3 is connected with the input pipeline of magnetic valve 4, the output of magnetic valve 4 is connected with throttling arrangement 5 input pipelines, the output of throttling arrangement 5 is connected with the input pipeline of evaporimeter 6, and the output of evaporimeter 6 is connected with the input pipeline of compressor 1; In addition, another magnetic valve 7 is inserted on the bypass pipe road that has access in parallel between the input of the output of compressor 1 and evaporimeter 6 on bypass line; Further, an end of water tank 8 is connected with evaporimeter 6 pipelines, and the other end is connected with a water pump 9 pipelines, and water pump 9 is connected with evaporimeter 6 pipelines.
When cooling-water machine need freeze, magnetic valve 7 cuts out, cold-producing medium is entered condenser 2 by the gas that compressor 1 is compressed into HTHP, liquid through condenser 2 heat exchange Cheng Zhongwen high pressure passes through magnetic valve 4, enter throttling arrangement 5 through magnetic valve 4, and enter in the evaporimeter 6 after in throttling arrangement 5, becoming the moist steam of low-temp low-pressure, the moist steam of low-temp low-pressure is carried out heat exchange with the recirculated water that enters in the evaporimeter 6, flash to gaseous state behind the moist steam absorption heat of low-temp low-pressure and be inhaled into compressor 1 again, so circulate repeatedly, until the water in the water tank 8 is freezed to the temperature that sets.
When the water temperature in the water tank 8 is lower than the temperature of setting, this moment, magnetic valve 4 cut out, cold-producing medium is compressed into the gas of HTHP by magnetic valve 7 by compressor, again through evaporimeter 6 and with the recirculated water heat exchange that enters in the evaporimeter 6, the liquid of warm high pressure is entering compressor 1 in becoming after the gas heat release of HTHP, so circulate repeatedly, until the water in the water tank 8 being warmed up to the temperature that sets.
The cooling-water machine of the type can reach the effect of constant temperature to a certain extent, but its fluctuating temperature is bigger.In addition at the selected magnetic valve 7 of refrigeration system owing to structural reason itself, the number of times life-span of its switch motion is less, generally can be above 2,000,000 times; By cycle of this magnetic valve 7 actions is to calculate in 10 seconds, and the time of cooling-water machine work every day is 12 hours, and be the service life of this cooling-water machine so:
2,000,000 * 10 seconds/(3600*12*30*12)=1.286 years
But the total time of 10 seconds=operate as normal of 2,000,000 *
The 3600*12=darg time
One month working time of 3600*12*30=
The working time in 1 year of 3600*12*30*12=
Another high accuracy cooling-water machine, it mainly is to use converter technique to reach the effect of constant temperature.But its cost is higher, and maintenance is inconvenient, and the electromagnetic interference that produces in conversion process is bigger, thereby has limited its scope of application.
Common high accuracy cooling-water machine is in electrical control, the pulse signal of generally taking that is to use common relay to transform different duty is a switching signal, thereby the opening and closing of control magnetic valve, and this common actuating of relay life-span is very short, generally can be above 300,000 times.
The utility model content
The purpose of this utility model is to have overcome the existing shortcoming of existing constant temperature cooling-water machine, and a kind of constant temperature precision height, the long cooling-water machine of with low cost and whole service life are provided.
The utility model is to realize like this, a kind of high accuracy constant temperature cooling-water machine, comprise: compressor, condenser, device for drying and filtering, electric expansion valve, heat exchanger, water tank, water pump, the output of described compressor is connected with the input pipeline of described condenser, the output of described condenser is connected with the input pipeline of described device for drying and filtering, the output of described device for drying and filtering is connected with the input pipeline of described electric expansion valve, described electric expansion valve output is connected with the input pipeline of described heat exchanger refrigerant side, the output of described heat exchanger refrigerant side is connected with the input pipeline of described compressor, described water tank one end is connected with the input pipeline of described heat exchanger water side, the described water tank other end is connected with described water pump pipeline, described water pump is connected with the output pipeline of described heat exchanger water side, also be provided with a temperature sensor in the described water tank, described temperature sensor is electrically connected with a PID controller, described PID controller is electrically connected with a solid-state relay, described solid-state relay is electrically connected with described electric expansion valve, a capacity adjusting valve is inserted on the bypass pipe road that has access in parallel between the input of the output of described compressor and described heat exchanger refrigerant side on the described bypass line.
Particularly, described heat exchanger is a plate type heat exchanger.
This high accuracy constant temperature cooling-water machine is on the bypass closed circuit, used capacity adjusting valve to substitute existing magnetic valve, give the PID controller by the temperature signal of temperature sensor feedback then, the pulse signal that the PID controller produces different duty is converted to switching signal through solid-state relay, open and close with the control electric expansion valve, thereby the water temperature in the constant water tank can make temperature fluctuation smaller or equal to ± 0.1 ℃; But it is long-time steady operation also, and the precision instrument that is very suitable for water temperature is had high requirements uses.
Description of drawings
Fig. 1 is the structure chart of the cooling-water machine that provides of prior art;
Fig. 2 is the structure chart of the high accuracy cooling-water machine that provides of the utility model embodiment.
The specific embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 2, the high accuracy constant temperature cooling-water machine that the utility model embodiment provides, comprise: compressor 10, condenser 20, device for drying and filtering 30, electric expansion valve 40, plate type heat exchanger (evaporimeter) 60, water tank 80, water pump 70, the output of described compressor 10 is connected with the input pipeline of described condenser 20, the output of described condenser 20 is connected with the input pipeline of described device for drying and filtering 30, the output of described device for drying and filtering 30 is connected with the input pipeline of described electric expansion valve 40, described electric expansion valve 40 outputs are connected with the input pipeline of described plate type heat exchanger 60 refrigerant sides, the output of described plate type heat exchanger 60 refrigerant sides is connected with the input pipeline of described compressor 10, described water tank 80 1 ends are connected with the input pipeline of described plate type heat exchanger 60 water sides, described water tank 80 other ends are connected with described water pump 70 pipelines, described water pump 70 other ends are connected with the output pipeline of described plate type heat exchanger 60 water sides, also be provided with a temperature sensor 90 in the described water tank 80, described temperature sensor 90 is electrically connected with a PID controller 100, described PID controller 100 is electrically connected with a solid-state relay 110, described solid-state relay 110 is electrically connected with described electric expansion valve 40, described temperature sensor 90 feeds back to PID controller 100 with the temperature signal of water in the water tank 80, the pulse signal of described PID controller 100 output different duty is given solid-state relay 110, and described solid-state relay 110 is converted into the open and close of switching signal with control electric expansion valve 40 with pulse signal; In addition, a capacity adjusting valve 50 is inserted on the bypass pipe road that has access in parallel between the input of the output of described compressor 10 and described plate type heat exchanger 60 refrigerant sides on the described bypass line.
When cooling-water machine carries out work, temperature sensor 90 feeds back to PID controller 100 with the temperature signal of water in the water tank 80, PID controller 100 is controlled solid-state relay 110 after by automatic calculation, and solid-state relay 110 is controlled electric expansion valve 40 open and close again, thereby the refrigeration of real refrigeration system and the control of not freezing, finally make water temperature stability in the water tank 80 in setting value, realize high-precision constant temperature effect.
The concrete course of work of high accuracy constant temperature cooling-water machine of the present utility model is as follows:
(1) at first compressor 10 is set to not shut down working method; in the time need freezing to the water in the water tank 80; temperature sensor 90 feeds back to PID controller 100 with the temperature signal of water in the water tank 80; PID controller 100 is controlled solid-state relay 110 after by automatic calculation; and solid-state relay 110 is controlled electric expansion valve 40 unlatchings again; the port of export pressure of capacity adjusting valve 50 will rise rapidly; when rising to the setting working value of capacity adjusting valve 50; capacity adjusting valve 50 is closed this bypass line automatically; the refrigerant gas of the HTHP of discharging from compressor 10 through the refrigerant gas of warm high pressure becoming behind the condenser 20 by device for drying and filtering 30; enter electric expansion valve 40 through device for drying and filtering 30; go into board-like heat exchanger 60 refrigerant sides through the moist steam that becomes low-temp low-pressure behind the electric expansion valve 40 is laggard; the moist steam of the low-temp low-pressure in plate type heat exchanger 60 refrigerant sides with carry out heat exchange by the recirculated water in the water pump 70 suction plate type heat exchangers 60 water sides; water temperature is reduced; cold-producing medium after the heat exchange returns compressor 10; circulation so repeatedly is until the water in the water tank 80 being freezed to the temperature of setting.
(2) when the water temperature in the water tank 80 is lower than the temperature of setting, PID controller 100 is controlled solid-state relay 110 after by automatic calculation, and solid-state relay 110 controls electric expansion valve 40 again and cuts out, the port of export pressure of capacity adjusting valve 50 will descend rapidly, when dropping to the setting working value of capacity adjusting valve 50, capacity adjusting valve 50 is opened this bypass line automatically, the refrigerant gas of the HTHP of discharging from compressor 10 carries out heat exchange through the recirculated water plate type heat exchanger 60 refrigerant sides and the plate type heat exchanger 60 water sides, the heat temperature of recirculated water absorption refrigeration agent raises, and the refrigerant gas of HTHP become in the refrigerant gas of warm high pressure, and then get back to compressor 10, circulation so repeatedly is until the temperature that the water in the water tank 80 is warmed up to setting.
The high accuracy constant temperature cooling-water machine that the utility model provides, by compressor 10, condenser 20, device for drying and filtering 30, electric expansion valve 40, the refrigeration cycle that capacity adjusting valve 50 and plate type heat exchanger 60 are formed, by temperature sensor 90, the control system that PID controller 100 and solid-state relay 110 are formed, its improvement is, have access to a bypass pipe road between described compressor 10 outputs and the plate type heat exchanger 60 refrigerant side inputs, insert capacity adjusting valve 50 on the described bypass line and substitute existing magnetic valve, the open and close of described electric expansion valve 40 are by solid-state relay 110 controls, described solid-state relay 110 is controlled by the pulse signal of the different duty that described PID temperature controller 100 is exported, described temperature sensor 90 feeds back to described PID controller 100 to temperature signal, the refrigeration that realizes cooling-water machine by the open and close electric expansion valve 40 of such different time ratio with do not freeze, thereby the water temperature in the constant water tank.
The difference of the utility model high accuracy constant temperature cooling-water machine and common high accuracy cooling-water machine is: on the bypass pipe between the input of the output of compressor 10 and plate type heat exchanger 60 refrigerant sides, use capacity adjusting valve 50 to substitute existing magnetic valve, capacity adjusting valve 50 need not power supply, and noise is well below general solenoid valve during work, and operating life is far longer than magnetic valve, and capacity adjusting valve 50 is operate as normal that automatic conducting cooperates refrigeration system when being lower than setting value according to port of export pressure.Compressor 10 is set to non-stop-machine working method; when electric expansion valve 40 was closed, the port of export pressure of capacity adjusting valve 50 will descend rapidly, when dropping to the setting working value of capacity adjusting valve 50; capacity adjusting valve 50 is opened automatically, to guarantee the normal circulation of refrigerating circuit.When electric expansion valve 40 was opened, the port of export pressure of capacity adjusting valve 50 will rise rapidly, and when rising to the setting working value of capacity adjusting valve 50, capacity adjusting valve 50 is closed automatically, so circulation.
On control loop, used solid-state relay 110 to substitute relay commonly used and changed the switching signal of the pulse signal of different duty, thereby can very accurately water temperature be controlled at the temperature value of being subscribed as electric expansion valve 40.The different time ratio cycle of the pulse signal by regulating PID controller 100, finally can realize water temperature at ± 0.1 ℃ with interior fluctuation.Solid-state relay 110 no switch number of times restrictions, its operating life is far longer than relay commonly used.
The utility model uses capacity adjusting valve 50 replacement of solenoid valve on bypass line, on control loop, used solid-state relay 110 to substitute relay, can cooperate the frequent open and close of electric expansion valve 40, more can guarantee the long steady operation of cooling-water machine.The number of times of capacity adjusting valve 50, solid-state relay 110 and electric expansion valve 40 switch motions life-span 〉=3,000 ten thousand times, by cycle of this electric expansion valve 40 actions is to calculate in 10 seconds, the time of cooling-water machine work every day is 12 hours, and be the service life of this cooling-water machine so:
3,000 ten thousand * 10 seconds/(3600*12*30*12)=19.29 years
But the total time of 10 seconds=operate as normal of 3,000 ten thousand *
The 3600*12=darg time
One month working time of 3600*12*30=
The working time in 1 year of 3600*12*30*12=
This shows, be far longer than common high accuracy cooling-water machine the service life of high accuracy constant temperature cooling-water machine of the present utility model.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (2)
1. high accuracy constant temperature cooling-water machine, comprise: compressor, condenser, device for drying and filtering, electric expansion valve, heat exchanger, water tank, water pump, the output of described compressor is connected with the input pipeline of described condenser, the output of described condenser is connected with the input pipeline of described device for drying and filtering, the output of described device for drying and filtering is connected with the input pipeline of described electric expansion valve, described electric expansion valve output is connected with the input pipeline of described heat exchanger refrigerant side, the output of described heat exchanger refrigerant side is connected with the input pipeline of described compressor, described water tank one end is connected with the input pipeline of described heat exchanger water side, the described water tank other end is connected with described water pump pipeline, described water pump is connected with the output pipeline of described heat exchanger water side, it is characterized in that: also be provided with a temperature sensor in the described water tank, described temperature sensor is electrically connected with a PID controller, described PID controller is electrically connected with a solid-state relay, described solid-state relay is electrically connected with described electric expansion valve, have access to a bypass pipe road between the input of the output of described compressor and described heat exchanger refrigerant side, insert a capacity adjusting valve on the described bypass line.
2. high accuracy constant temperature cooling-water machine as claimed in claim 1 is characterized in that: described heat exchanger is a plate type heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201345460U CN201476387U (en) | 2009-08-06 | 2009-08-06 | High-precision thermostatic cooling-water machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201345460U CN201476387U (en) | 2009-08-06 | 2009-08-06 | High-precision thermostatic cooling-water machine |
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| CN201476387U true CN201476387U (en) | 2010-05-19 |
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| CN2009201345460U Expired - Lifetime CN201476387U (en) | 2009-08-06 | 2009-08-06 | High-precision thermostatic cooling-water machine |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944085A (en) * | 2012-11-14 | 2013-02-27 | 合肥天鹅制冷科技有限公司 | Liquid cooling system utilizing condensation heat to be self-adaptive to refrigerating capacity |
| CN103868300A (en) * | 2014-03-24 | 2014-06-18 | 扬州天智水冷设备有限公司 | Method for controlling energy-saving and constant-temperature water-cooling machine of dual-refrigeration control system |
| CN104110921A (en) * | 2013-04-22 | 2014-10-22 | 东莞市德思环境仪器有限公司 | Refrigeration equipment energy output intelligent stepless control system |
| CN104215008A (en) * | 2014-10-08 | 2014-12-17 | 烟台荏原空调设备有限公司 | Method and system of capacity regulation of screw refrigerator |
| CN104457076A (en) * | 2014-12-23 | 2015-03-25 | 天津职业技术师范大学 | Refrigeration method based on PID control electromagnetic valve |
| CN104976812A (en) * | 2014-04-02 | 2015-10-14 | 北京众合创业科技发展有限责任公司 | High precision dynamic control method for refrigerating capacity of compressor refrigeration system |
| CN105020952A (en) * | 2014-04-21 | 2015-11-04 | 北京众合创业科技发展有限责任公司 | Dynamic and constant-temperature realizing method for high-temperature cooling water |
| CN105229393A (en) * | 2014-02-24 | 2016-01-06 | 伸和控制工业股份有限公司 | Refrigerating plant |
| CN107339820A (en) * | 2017-08-22 | 2017-11-10 | 合肥天鹅制冷科技有限公司 | The water circulation cooling device of high accuracy temperature control |
| CN109210813A (en) * | 2018-09-25 | 2019-01-15 | 武汉虹之彩包装印刷有限公司 | A kind of automatically controlled cooling-water machine of water cooling with dual-cycle plant |
| CN110822750A (en) * | 2019-12-11 | 2020-02-21 | 郑州长城科工贸有限公司 | Fluid temperature control system and control method based on cascade closed-loop PID regulation |
| CN111895690A (en) * | 2020-09-03 | 2020-11-06 | 鑫春益（深圳）科技有限公司 | Water chiller with double-temperature and double-control system structure |
| CN112880217A (en) * | 2021-01-28 | 2021-06-01 | 扬州恒德工业科技有限公司 | Double-temperature cold water system |
-
2009
- 2009-08-06 CN CN2009201345460U patent/CN201476387U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944085B (en) * | 2012-11-14 | 2014-12-31 | 合肥天鹅制冷科技有限公司 | Liquid cooling system utilizing condensation heat to be self-adaptive to refrigerating capacity |
| CN102944085A (en) * | 2012-11-14 | 2013-02-27 | 合肥天鹅制冷科技有限公司 | Liquid cooling system utilizing condensation heat to be self-adaptive to refrigerating capacity |
| CN104110921A (en) * | 2013-04-22 | 2014-10-22 | 东莞市德思环境仪器有限公司 | Refrigeration equipment energy output intelligent stepless control system |
| CN105229393A (en) * | 2014-02-24 | 2016-01-06 | 伸和控制工业股份有限公司 | Refrigerating plant |
| CN103868300A (en) * | 2014-03-24 | 2014-06-18 | 扬州天智水冷设备有限公司 | Method for controlling energy-saving and constant-temperature water-cooling machine of dual-refrigeration control system |
| CN104976812A (en) * | 2014-04-02 | 2015-10-14 | 北京众合创业科技发展有限责任公司 | High precision dynamic control method for refrigerating capacity of compressor refrigeration system |
| CN105020952A (en) * | 2014-04-21 | 2015-11-04 | 北京众合创业科技发展有限责任公司 | Dynamic and constant-temperature realizing method for high-temperature cooling water |
| CN104215008A (en) * | 2014-10-08 | 2014-12-17 | 烟台荏原空调设备有限公司 | Method and system of capacity regulation of screw refrigerator |
| CN104215008B (en) * | 2014-10-08 | 2016-05-25 | 烟台荏原空调设备有限公司 | A kind of method and system of screw refrigerator capacity regulating |
| CN104457076A (en) * | 2014-12-23 | 2015-03-25 | 天津职业技术师范大学 | Refrigeration method based on PID control electromagnetic valve |
| CN107339820A (en) * | 2017-08-22 | 2017-11-10 | 合肥天鹅制冷科技有限公司 | The water circulation cooling device of high accuracy temperature control |
| CN107339820B (en) * | 2017-08-22 | 2023-10-20 | 合肥天鹅制冷科技有限公司 | High-precision temperature-control water circulation cooling equipment |
| CN109210813A (en) * | 2018-09-25 | 2019-01-15 | 武汉虹之彩包装印刷有限公司 | A kind of automatically controlled cooling-water machine of water cooling with dual-cycle plant |
| CN110822750A (en) * | 2019-12-11 | 2020-02-21 | 郑州长城科工贸有限公司 | Fluid temperature control system and control method based on cascade closed-loop PID regulation |
| CN111895690A (en) * | 2020-09-03 | 2020-11-06 | 鑫春益（深圳）科技有限公司 | Water chiller with double-temperature and double-control system structure |
| CN112880217A (en) * | 2021-01-28 | 2021-06-01 | 扬州恒德工业科技有限公司 | Double-temperature cold water system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100519 |