CN204923613U - Accurate control system of refrigerating output - Google Patents
Accurate control system of refrigerating output Download PDFInfo
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- CN204923613U CN204923613U CN201520587091.3U CN201520587091U CN204923613U CN 204923613 U CN204923613 U CN 204923613U CN 201520587091 U CN201520587091 U CN 201520587091U CN 204923613 U CN204923613 U CN 204923613U
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- compressor
- control system
- expansion valve
- pass line
- controller
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model discloses an accurate control system of refrigerating output includes PID controller, SMD controller, refrigeration pipeline and is formed compressor, air -cooled condenser, marching type electronic expansion valve and the evaporimeter of annular intercommunication by refrigeration pipeline in proper order. Marching type electronic expansion valve with SMD controller electric connection, the last exhaust end in the compressor of refrigeration pipeline is connected with hot by pass line, is equipped with the energy adjustment valve on the hot by pass line, the last exit in air -cooled condenser of refrigeration pipeline is connected with cold by pass line, is equipped with thermostatic expansion valve on the cold by pass line, the PID controller includes the PWM controller, and energy adjustment valve and thermostatic expansion valve pass through PWM controller and PID controller electric connection. The utility model discloses accurate control system of refrigerating output adopts above -mentioned structural design to make the utility model has the advantages of energy -conservation is effectual, control accuracy is high and long service life.
Description
Technical field
The utility model relates to a kind of thermostatic control system of testing equipment, particularly a kind of refrigerating capacity accuracy-control system of the constant temperature for low-temperature test chamber, high-low temperature test chamber, high/low temperature rapid temperature change testing box, low temperature impact test box, GDJS.
Background technology
Relate in environmental test equipment and need the chamber of constant middle low temperature or Low Temperature Wet Warm status usually to adopt heating balance constant temperature and humidity control method, the cardinal principle of this control method is: when steady temperature/humidity point, refrigeration system keeps the conveying of maximum cooling capacity to chamber operating room, then by regulating the heating power of operating room's internal heater to offset refrigerating capacity, finally reach required temperature/humidity point, then closed control valve.The feature of this kind of method is can effectively and stably steady temperature/humidity point, but corresponding shortcoming is that not only consume refrigeration work consumption but also consume heating power, energy consumption is large especially when constant most temperature/humidity point.For this reason, from the viewpoint of energy-conserving and environment-protective, this technology needs to improve.
Utility model content
For above-mentioned deficiency, the purpose of this utility model is, provides a kind of refrigerating capacity accuracy-control system, and it has good energy-conserving effect and the high advantage of control accuracy.
For achieving the above object, technical scheme provided by the utility model is:
A kind of refrigerating capacity accuracy-control system comprises PID controller, SMD controller, refrigeration piping and by refrigeration piping formed successively annular be communicated with compressor, air-cooled condenser, step-by-step movement electric expansion valve and evaporimeter, described step-by-step movement electric expansion valve and described SMD controller are electrically connected, described refrigeration piping is connected with hot by-pass line in the exhaust end of compressor, the other end of this hot by-pass line is connected with the air return end of described compressor, described hot by-pass line is provided with capacity adjusting valve, described refrigeration piping is connected with cold by-pass line in the exit of air-cooled condenser, the other end of this cold by-pass line is connected with the air return end of described compressor, described cold by-pass line is provided with heating power expansion valve, temperature-sensitive pipeline and pressure-equalizing passageway is provided with between the air return end of this heating power expansion valve and described compressor, temperature-sensitive bag is provided with in temperature-sensitive pipeline, described pressure-equalizing passageway is connected with described capacity adjusting valve, described PID controller comprises PWM controller, described capacity adjusting valve and heating power expansion valve are electrically connected by PWM controller and PID controller.
Improve as one of the present utility model, in described step-by-step movement electric expansion valve, be provided with high-resolution stepper motor and magnetic valve.
Improve as one of the present utility model, the total step number of described stepper motor is 650 steps, and is provided with choke valve and screen pack in described stepper motor.
Improve as one of the present utility model, described refrigerating capacity accuracy-control system also comprises the oil eliminator be installed between the outlet of compressor and the contact of capacity adjusting valve, and the separating oil outlet of this oil eliminator is connected with the machine oil chamber of described compressor.
Improve as one of the present utility model, described refrigeration piping is provided with reservoir in described air-cooled condenser exit.
Improve as one of the present utility model, the exit of described reservoir is provided with device for drying and filtering.
The beneficial effects of the utility model are: the step-by-step movement electric expansion valve of the utility model refrigerating capacity accuracy-control system can according to the difference of operating room's actual temperature and design temperature, the unlatching step number of control step motor is carried out by SMD controller, thus control to enter the refrigerant flow of evaporimeter, make the utility model have good energy-conserving effect and the high advantage of control accuracy.Described PID controller regulates described capacity adjusting valve and heating power expansion valve for carrying out ftercompction when step-by-step movement electric expansion valve open degree is very little to compressor return air end by described PWM controller, negative pressure is formed to prevent compressor return air end, and a cold thermal design of hot by-pass line and cold by-pass line, regulating action can also be played to the temperature of compressor return air end, to prevent overheat of compressor or excessively cold, therefore improve the service life of this refrigerating capacity accuracy-control system.The utility model refrigerating capacity accuracy-control system adopts said structure design to make the utility model have the high and advantage of long service life of good energy-conserving effect, control accuracy.
Below in conjunction with accompanying drawing and embodiment, the utility model is further illustrated.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model refrigerating capacity accuracy-control system.
In figure, each description of reference numerals is as follows.
Refrigeration piping-1, hot by-pass line-11, capacity adjusting valve-111, cold by-pass line-12, heating power expansion valve-121, temperature-sensitive pipeline-13, pressure-equalizing passageway-14, compressor-2, air-cooled condenser-3, step-by-step movement electric expansion valve-4, evaporimeter-5, oil eliminator-6, reservoir-7, device for drying and filtering-8.
Detailed description of the invention
By describing technology contents of the present utility model, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with embodiment.
Refer to Fig. 1, a kind of refrigerating capacity accuracy-control system comprises PID controller, SMD controller, refrigeration piping 1 and forms the annular compressor 2, air-cooled condenser 3, step-by-step movement electric expansion valve 4 and the evaporimeter 5 that are communicated with successively by refrigeration piping 1.Described compressor 2 is for being compressed into the refrigerant gas of HTHP by the refrigerant gas of low-temp low-pressure, described air-cooled condenser 3 is for passing through the heat exchange to air by the refrigerant gas of HTHP, become the refrigerant liquid of normal temperature high voltage, described step-by-step movement electric expansion valve 4 is electrically connected with described SMD controller.Described refrigeration piping 1 is connected with hot by-pass line 11 in the exhaust end of compressor 2, the other end of this hot by-pass line 11 is connected with the air return end of described compressor 2, described hot by-pass line 11 is provided with capacity adjusting valve 111, this structural design is used for the gaseous refrigerant of a compressor 2 exhaust end HTHP shunting part directly to get back to compressor 2 air return end, according to compressor 2 back pressure to the ftercompction of compressor 2 air return end, there is negative pressure in anti-locking system, and the frosting of compressor 2 air return end can be prevented too much.Described refrigeration piping 1 is connected with cold by-pass line 12 in the exit of air-cooled condenser 3, the other end of this cold by-pass line 12 is connected with the air return end of described compressor 2, described cold by-pass line 12 is provided with heating power expansion valve 121, this structural design is used for the refrigerant liquid condensed liquid refrigerant being converted to low-temp low-pressure through throttling expansion, to compressor 2 back pressure to the ftercompction of compressor 2 air return end, there is negative pressure in anti-locking system, and compressor 2 air return end can be prevented overheated.In the present embodiment, temperature-sensitive pipeline 13 and pressure-equalizing passageway 14 is provided with between described heating power expansion valve 121 and the air return end of described compressor 2, temperature-sensitive bag is provided with in temperature-sensitive pipeline 13, described pressure-equalizing passageway 14 is connected with described capacity adjusting valve 111, by the temperature-sensitive bag of described temperature-sensitive pipeline 13 and the temperature and pressure signal of pressure-equalizing passageway 14 perception, control the open degree of capacity adjusting valve 111 and heating power expansion valve 121, to meet back pressure and the suction temperature of compressor (2).Described PID controller comprises PWM controller, and described capacity adjusting valve 111 and heating power expansion valve 121 are electrically connected by PWM controller and PID controller.
In the present embodiment, be provided with high-resolution stepper motor and magnetic valve in described step-by-step movement electric expansion valve 4, this magnetic valve can cut out automatically when emergency, prevents described compressor 2 flooded starts.
In the present embodiment, the total step number of described stepper motor is 650 steps, and is provided with choke valve and screen pack in this stepper motor, can control the output quantity of cold-producing medium effectively accurately.
In the present embodiment, described step-by-step movement electric expansion valve 4 can according to the difference of operating room's actual temperature and design temperature, the unlatching step number of control step motor is carried out by SMD controller, thus control the refrigerant flow entering evaporimeter 5, finally reach the object of constant temperature/constant humidity under the condition not adding heat, the magnetic valve that step-by-step movement electric expansion valve carries, can will become the refrigerant liquid of low-temp low-pressure after condensed normal temperature high voltage refrigerant liquid expansion throttling.
Described refrigerating capacity accuracy-control system also comprises the oil eliminator 6 between outlet and the contact of capacity adjusting valve 111 being installed in compressor 2, and the separating oil outlet of this oil eliminator 6 is connected with the machine oil chamber of described compressor 2.
Described refrigeration piping 1 is provided with reservoir 7 in described air-cooled condenser 3 exit.
The exit of described reservoir 7 is provided with device for drying and filtering 8, for filtering impurity in cold-producing medium and moisture.
As mentioned above, the step-by-step movement electric expansion valve 4 of the utility model refrigerating capacity accuracy-control system can according to the difference of operating room's actual temperature and design temperature, the unlatching step number of control step motor is carried out by SMD controller, thus control to enter the refrigerant flow of evaporimeter 5, make the utility model have good energy-conserving effect and the high advantage of control accuracy.Described PID controller regulates described capacity adjusting valve 111 and heating power expansion valve 121 for carrying out ftercompction when step-by-step movement electric expansion valve 4 open degree is very little to compressor 2 air return end by described PWM controller, negative pressure is formed to prevent compressor 2 air return end, and a cold thermal design of hot by-pass line 11 and cold by-pass line 12, regulating action can also be played to the temperature of compressor 2 air return end, to prevent compressor 2 overheated or excessively cold, therefore improve the service life of this refrigerating capacity accuracy-control system.
The announcement of book and instruction according to the above description, the utility model those skilled in the art can also change above-mentioned embodiment and revise.Therefore, the utility model is not limited to detailed description of the invention disclosed and described above, also should fall in the protection domain of claim of the present utility model modifications and changes more of the present utility model.In addition, although employ some specific terms in this description, these terms just for convenience of description, do not form any restriction to the utility model, adopt other device same or analogous with it, all in the utility model protection domain.
Claims (6)
1. a refrigerating capacity accuracy-control system, it is characterized in that: comprise PID controller, SMD controller, refrigeration piping (1) and by refrigeration piping (1) formed successively annular be communicated with compressor (2), air-cooled condenser (3), step-by-step movement electric expansion valve (4) and evaporimeter (5), described step-by-step movement electric expansion valve (4) and described SMD controller are electrically connected, described refrigeration piping (1) is connected with hot by-pass line (11) in the exhaust end of compressor (2), the other end of this hot by-pass line (11) is connected with the air return end of described compressor (2), described hot by-pass line (11) is provided with capacity adjusting valve (111), described refrigeration piping (1) is connected with cold by-pass line (12) in the exit of air-cooled condenser (3), the other end of this cold by-pass line (12) is connected with the air return end of described compressor (2), described cold by-pass line (12) is provided with heating power expansion valve (121), temperature-sensitive pipeline (13) and pressure-equalizing passageway (14) is provided with between the air return end of this heating power expansion valve (121) and described compressor (2), temperature-sensitive pipeline is provided with temperature-sensitive bag in (13), described pressure-equalizing passageway (14) is connected with described capacity adjusting valve (111), described PID controller comprises PWM controller, described capacity adjusting valve (111) and heating power expansion valve (121) are electrically connected by PWM controller and PID controller.
2. refrigerating capacity accuracy-control system as claimed in claim 1, is characterized in that: be provided with high-resolution stepper motor and magnetic valve in described step-by-step movement electric expansion valve (4).
3. refrigerating capacity accuracy-control system as claimed in claim 2, is characterized in that: the total step number of described stepper motor is 650 steps, and is provided with choke valve and screen pack in described stepper motor.
4. refrigerating capacity accuracy-control system as claimed in claim 1, it is characterized in that: described refrigerating capacity accuracy-control system also comprises the oil eliminator (6) between outlet and the contact of capacity adjusting valve (111) being installed in compressor (2), the separating oil outlet of this oil eliminator (6) is connected with the machine oil chamber of described compressor (2).
5. refrigerating capacity accuracy-control system as claimed in claim 1, is characterized in that: described refrigeration piping (1) is provided with reservoir (7) in described air-cooled condenser (3) exit.
6. refrigerating capacity accuracy-control system as claimed in claim 5, is characterized in that: the exit of described reservoir (7) is provided with device for drying and filtering (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520587091.3U CN204923613U (en) | 2015-08-06 | 2015-08-06 | Accurate control system of refrigerating output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520587091.3U CN204923613U (en) | 2015-08-06 | 2015-08-06 | Accurate control system of refrigerating output |
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| CN204923613U true CN204923613U (en) | 2015-12-30 |
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| CN201520587091.3U Expired - Fee Related CN204923613U (en) | 2015-08-06 | 2015-08-06 | Accurate control system of refrigerating output |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108895697A (en) * | 2018-04-20 | 2018-11-27 | 合肥通用机械研究院有限公司 | A kind of compression condensation system of refrigerating capacity step-less adjustment |
| CN109373636A (en) * | 2018-11-09 | 2019-02-22 | 珠海格力电器股份有限公司 | A kind of system and method preventing liquid hammer |
| CN111237934A (en) * | 2020-02-29 | 2020-06-05 | 上海弗有冷热控制技术有限公司 | Energy-saving method applied to temperature and humidity control of air conditioner enthalpy difference laboratory |
-
2015
- 2015-08-06 CN CN201520587091.3U patent/CN204923613U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108895697A (en) * | 2018-04-20 | 2018-11-27 | 合肥通用机械研究院有限公司 | A kind of compression condensation system of refrigerating capacity step-less adjustment |
| CN108895697B (en) * | 2018-04-20 | 2020-12-25 | 合肥通用机械研究院有限公司 | Compression condensing system with refrigeration capacity being adjusted steplessly |
| CN109373636A (en) * | 2018-11-09 | 2019-02-22 | 珠海格力电器股份有限公司 | A kind of system and method preventing liquid hammer |
| CN109373636B (en) * | 2018-11-09 | 2023-07-04 | 珠海格力电器股份有限公司 | System and method for preventing liquid impact |
| CN111237934A (en) * | 2020-02-29 | 2020-06-05 | 上海弗有冷热控制技术有限公司 | Energy-saving method applied to temperature and humidity control of air conditioner enthalpy difference laboratory |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20180806 |
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| CF01 | Termination of patent right due to non-payment of annual fee |