CN101769662B - Frequency conversion energy-saving temperature control device of refrigerating device - Google Patents
Frequency conversion energy-saving temperature control device of refrigerating device Download PDFInfo
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- CN101769662B CN101769662B CN2008101877848A CN200810187784A CN101769662B CN 101769662 B CN101769662 B CN 101769662B CN 2008101877848 A CN2008101877848 A CN 2008101877848A CN 200810187784 A CN200810187784 A CN 200810187784A CN 101769662 B CN101769662 B CN 101769662B
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Abstract
The present invention relates to a frequency conversion energy-saving temperature control device of a refrigerating device, comprising a frequency conversion compressor, a condenser, an expansion device and an evaporator; the frequency conversion energy-saving temperature control device is also provided with a first hot-gas bypass circuit and a first flow rate control valve thereof which are used for receiving high temperature and high pressure gaseous refrigerant output by the frequency conversion compressor and outputting the gaseous refrigerant into an input end of the evaporator, as well as a second hot-gas bypass circuit and a second flow rate control valve thereof which are used for receiving high temperature and high pressure gaseous refrigerant output by the frequency conversion compressor and outputting the gaseous refrigerant into an input end of the frequency conversion compressor. By using the first and the second hot gas bypass circuits, the first flow rate control valve and the second control valve to respectively reflect volume control, rapid reaction and the temperature change of working fluid of a working machine connected with the evaporator, the device can accurately carry out constant temperature control.
Description
Technical field
The energy-saving and frequency-variable attemperating unit of the relevant a kind of refrigerating plant of the present invention refers to a kind ofly cooperate hot gas bypass circuit to carry out flow and temperature controlled energy-saving and frequency-variable attemperating unit respectively with frequency-changeable compressor especially.
Background technology
The industry process equipment, for example: toolroom machine, semiconductor machining refrigerator etc., when processing operation, can produce high temperature, cause thermal change position phenomenon and make those equipment processing platforms depart from the center, and then influence machining accuracy.Therefore, be the cooperation industry precise treatment of marching toward, need suitably to adopt the processing refrigerator to suppress high temperature, the control machining accuracy can be produced high-quality, high additive value product.
In the above-mentioned process equipment, industrial refrigerator all need have the function of high-precision temperature control, the control of the fixed temperature frequently of tradition can't reach this requirement, use frequency conversion thermostatic control technology to keep more high-accuracy processing effect, and realize the green energy demand of economizing, become the trend of following processing refrigerator.
Traditional refrigeration system comprises invariable frequency compressor; condenser; expansion gear and evaporimeter; working fluid can be cooled to the operating temperature of setting and keep constant temperature; for reaching the demand of constant temperature cooling; in traditional low order refrigerating plant, often cooperate expansion gear to carry out flow and temperature control with invariable frequency compressor; when hanging down load flow; can make compressor shutdown; and restart for the protection compressor need postpone compressor usually after the compressor shutdown; it is unstable that so compressor on/off mode causes temperature control; therefore the characteristic curve of temperature presents zigzag (as Fig. 2), does not really reach the thermostatic control function.
Also have with invariable frequency compressor in the tradition refrigerating plant; cooperate hot gas bypass circuit to carry out flow and temperature control; when hanging down load flow; compressor still can not shut down; but because removal is considered; the high hot gaseous refrigerant of a large amount of high temperature compressed machine outlets directly adds evaporimeter front end place, expansion gear rear end, so also causes temperature control unstable, and temperature is higher easily.
In the tradition high-order refrigerating plant, also utilize a frequency-changeable compressor to cooperate expansion gear to carry out flow and temperature control, such system has energy-saving operation when steady load, and splendid flow and temperature controlled advantage.But when turning round under low load condition, if when being lower than frequency-changeable compressor flow rate adjustable scope, this moment, compressor still may be shut down, and as the shortcoming of on/off formula, can make temperature control unstable.
In the tradition high-order refrigerating plant, also utilize a frequency-changeable compressor, expansion gear to cooperate the bypass circulation device to carry out flow and temperature control (system such as Fig. 3), comprise frequency-changeable compressor 15, evaporimeter 14, condenser 17, expansion gear 13, hot gas bypass valve 16 and work mechanism 20, such system has energy-saving operation equally when steady load, and splendid flow and temperature controlled advantage.But when under low load condition, turning round; if be lower than frequency-changeable compressor 15 flow rate adjustable scopes; do not shut down for making frequency-changeable compressor 15; hot gas bypass valve 16 can be opened to regulate flow; the big calorimetric cold media gas that with the removal is purpose directly pours evaporimeter 14; can make temperature produce disturbing phenomenon, make that temperature control is unstable.As if expansion gear 13 corresponding unlatchings, allow more refrigerant by with the control temperature again, also can cause when hanging down load, frequency-changeable compressor 15 is on the contrary in higher rotation speed (frequency) running down, the shortcoming that wastes energy.The present invention can improve above-mentioned disappearance on the framework of using frequency-changeable compressor.
Summary of the invention
For solving the disappearance of the above prior art; the present invention is a kind of energy-saving and frequency-variable attemperating unit of refrigerating plant; main purpose is for to cooperate first bypass circulation and flow control valve thereof with a frequency-changeable compressor; second bypass circulation and flow control valve thereof carry out the control of flow and temperature respectively, in the time of can solving low load compressor shutdown cause temperature control unstable and when eliminating low load capacity hot gas bypass valve be that the removal purpose is opened the thermal perturbation phenomenon that causes.Except having energy-saving effect, also have temperature control and be swift in response, thermostatic control reaches the function of flow-control and accurate temperature control simultaneously when low load.
For achieving the above object, the present invention is a kind of energy-saving and frequency-variable attemperating unit of refrigerating plant, include a frequency-changeable compressor, a condenser, an expansion gear, an evaporimeter, its energy-saving and frequency-variable attemperating unit has more: first hot gas bypass circuit and first flow control valve, receive the gaseous coolant of the HTHP that this frequency-changeable compressor exports, export the input of an evaporimeter to, as the temperature control thermal source; Second hot gas bypass circuit and second flow control valve receive the gaseous coolant of the HTHP that this frequency-changeable compressor exports, and export the input of this frequency-changeable compressor to, and control is used as removal.Control the hot refrigerant vapor flow of first, second hot gas bypass circuit by this first flow control valve and second flow control valve; react the situation of the temperature working fluid change of a work mechanism that is connected with evaporimeter rapidly; and removal control during low load; avoid compressor shutdown; cause temperature control wild effect, to carry out accurate thermostatic control.
The present invention also has temperature control and is swift in response except having energy-saving effect, and thermostatic control reaches the function of flow-control and accurate temperature control simultaneously when low load.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the configuration diagram of the energy-saving and frequency-variable attemperating unit of refrigerating plant of the present invention;
Fig. 2 is traditional hot gas by-pass system figure;
Fig. 3 utilizes a frequency-changeable compressor and expansion gear for tradition and cooperates the bypass circulation device to carry out flow and temperature controlled Organization Chart.
Wherein, Reference numeral
13～expansion gear
14～evaporimeter
15～frequency-changeable compressor
16～hot gas bypass valve
17～condenser
20～work mechanism
1～frequency-changeable compressor
11～input
12～output
2～condenser
21～input
22～output
3～expansion gear
4～first flow control valve
41～control valve
42～solenoid valve
5～the second flow control valves
6～evaporimeter
61～first input end
62～the first outputs
63～the second inputs
64～the second outputs
7～work mechanism
8～the first hot gas bypass circuit
9～the second hot gas bypass circuit
The specific embodiment
Existing conjunction with figs. describes enforcement kenel of the present invention in detail.
As shown in Figure 1, enforcement kenel for the energy-saving and frequency-variable attemperating unit of refrigerating plant of the present invention, it includes: a frequency-changeable compressor 1, has the function that power is adjusted in frequency conversion, and with the gaseous coolant of the refrigerant boil down to HTHP of this frequency-changeable compressor 1 input 11, this frequency-changeable compressor 1 is the frequency-changeable compressor that can carry out rotating speed and volume controlled by the driving control device (not shown); One condenser 2 receives the gaseous coolant of the HTHP of 1 output 12 of this frequency-changeable compressor, after condenser 2 heat radiations, by output 22 outputs one high-pressure liquid refrigerant; One expansion gear 3 receives the high-pressure liquid refrigerant by condenser 2 outputs, after the expansion operation, exports a low-pressure liquid refrigerant, and this expansion gear 3 is can be by the valve member device of adjusting valve (not shown) aperture control liquid refrigerants circulation; First hot gas bypass circuit 8 and on first flow control valve 4, the gaseous coolant of the HTHP that frequency-changeable compressor 1 output 12 is exported, be communicated to the first input end 61 of an evaporimeter 6, this first flow control valve 4 controlled refrigeration matchmakers' flow, first hot gas bypass circuit 8 is an inlet by the frequency-changeable compressor 1 end rear that spues, and evaporimeter 6 front ends connect for outlet; Second hot gas bypass circuit 9 and on second flow control valve 5, the gaseous coolant of the HTHP that frequency-changeable compressor 1 output 12 is exported, be communicated to the input 11 of this frequency-changeable compressor 1, this second hot gas bypass circuit 9 is an inlet by the frequency-changeable compressor 1 end rear that spues, and evaporimeter 6 rears connect for outlet; One evaporimeter 6, second input 63 of this evaporimeter 6 and second output 64 are connected with the working fluid of a work mechanism 7, and this working fluid refers to wherein one of pure water, bittern and cold oil, and this evaporimeter 6 is in order to exchange the heat of two inputs 61,63.
Operation principle of the present invention is: be connected to expansion gear 3 outputs by frequency-changeable compressor 1 output, and the temperature control between evaporimeter 6 inputs is with first hot gas bypass circuit 8, temporary transient replenishing during as the violent change of load or low (zero) load substitutes thermal source, expansion gear need not acutely be changed, influence accuracy of temperature control.One is connected to evaporimeter 6 first outputs 62 by frequency-changeable compressor 1 output; with removal before frequency-changeable compressor 1 input 11 with second hot gas bypass circuit 9; use as removal; making frequency-changeable compressor can not be lower than the low frequency that turns round most because of load props up load and shuts down; the relatively large hot refrigerant of gaseous state of the removal evaporimeter of not flowing through can avoid interference the temperature control of working fluid.
Refrigerant is collapsed into the HTHP gaseous coolant via frequency-changeable compressor 1, via condenser 2 heat radiations, become the high-pressure liquid refrigerant, flow through expansion gear 3 and become the low-pressure liquid refrigerant, the evaporimeter 6 of flowing through again absorbs the heat that working fluid brings work mechanism 7 to be taken place, enter frequency-changeable compressor 1 again, become a circulation.Expansion gear 3 can be controlled the flow of liquid refrigerants, and determined the refrigerant inlet of the first input end 61 of inflow evaporator 6, can control the temperature of the working fluid of evaporimeter 6 second inputs 63, and frequency-changeable compressor 1 can change rotating speed and carries out cold medium flux control, and reaches energy-conservation purpose.
Under the situation of load sharp fall, first flow control valve 4 is in response to opening, this first hot gas bypass circuit 8, allow the gaseous coolant of an amount of high temperature directly add by evaporimeter 6 first input ends 61, temporarily supply former load thermal source, slowly close first flow control valve 4 again and turn down the expansion gear aperture, finally get back to by expansion gear and directly carry out the temperature control state.Because the heating that refrigeration source (liquid refrigerants) is arranged and replenish source (high-temperature gas refrigerant), therefore the situation of the sharp fall of reactive evaporation device 6 loads is rapidly controlled constant temperature accurately.If when load was lower than the load of frequency-changeable compressor low-limit frequency running, second flow control valve 5 (second hot gas bypass circuit) was opened, to keep the continuous running of frequency-changeable compressor low-limit frequency, to reach energy-saving effect.
During the situation that rises when load is acute (when work mechanism 7 is in high load condition), first and second flow control valve 4,5 keeps cutting out, expansion gear 3 apertures strengthen, allow an amount of liquid refrigerants flow into evaporimeter, the acute situation that rises of reactive evaporation device 6 loads is so rapidly controlled constant temperature accurately.
When load reduces the removal amount that surpasses frequency-changeable compressor (being work mechanism 7 is in when hanging down load or no-load condition); frequency-changeable compressor 1 can maintain minimum speed (flow) running; this moment, second flow control valve 5 was opened; allow unnecessary refrigerant not via condenser 2, expansion gear 3, evaporimeter 6; directly flow back to frequency-changeable compressor 1 suction side and form short circulation; can allow frequency-changeable compressor 1 not shut down; also evaporimeter 6 because a large amount of high-temperature gas refrigerant of removal is not flowed through; therefore can not influence temperature control, can keep temperature constant state.Do not influence the temperature control of evaporimeter again, can not cause that also the expansion gear aperture increases, do not have frequency-changeable compressor running under high rotating speed (high frequency) on the contrary when hanging down load, phenomenon wastes energy.
Description by above-mentioned Fig. 1, can understand the present invention is mainly with a frequency-changeable compressor and cooperates the first flow control valve and second flow control valve to carry out temperature and flow-control respectively, except having energy-saving effect, also having temperature control is swift in response, thermostatic control reaches the function of flow-control and accurate temperature control simultaneously when low load.With in the field of process equipment, has high usefulness in industry.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (6)
1. the energy-saving and frequency-variable attemperating unit of a refrigerating plant is characterized in that, this energy-saving and frequency-variable attemperating unit includes:
One frequency-changeable compressor has the function that power is adjusted in frequency conversion, and with the gaseous coolant of the refrigerant boil down to HTHP of this frequency-changeable compressor input, and export this refrigerant;
One condenser receives the gaseous coolant of the HTHP that this frequency-changeable compressor exports, and after the condenser heat radiation, exports a high-pressure liquid refrigerant;
One expansion gear has a valve, receives the high-pressure liquid refrigerant by condenser output, after the expansion operation, exports a low-pressure liquid refrigerant;
First hot gas bypass circuit receives the gaseous coolant of the HTHP that this frequency-changeable compressor exports, and exports the input of an evaporimeter to;
Second hot gas bypass circuit receives the gaseous coolant of the HTHP that this frequency-changeable compressor exports, and exports the input of this frequency-changeable compressor to; And
One evaporimeter, this evaporimeter one input is connected with the working fluid of a work mechanism, and another input connects this expansion gear and a first flow control valve simultaneously, and this evaporimeter is in order to exchange the heat of two inputs;
Wherein, this first flow control valve is arranged on this first hot gas bypass circuit, this first flow control valve can be when rapid decline of working fluid load or low load, open when making the evaporator operation fluid temperature (F.T.) of flowing through on the low side, supplemental heat source is provided, makes temperature working fluid get back to the steady temperature of setting; More be provided with one second flow control valve on this second hot gas bypass circuit; this second flow control valve is lower than in load to be opened when frequency-changeable compressor can be adjusted the low-limit frequency load; refrigerant is not via condenser, expansion gear and evaporimeter; directly with after the low pressure gaseous coolant mixes get back to compressor; form the removal effect; and frequency-changeable compressor can not be shut down, still be controlled at low-limit frequency and carry out energy-saving operation.
2. the energy-saving and frequency-variable attemperating unit of refrigerating plant according to claim 1 is characterized in that, this frequency-changeable compressor is the frequency-changeable compressor that can carry out rotating speed and volume controlled by driving control device.
3. the energy-saving and frequency-variable attemperating unit of refrigerating plant according to claim 1 is characterized in that, this expansion gear is to adjust the valve member device that valve opening is controlled the liquid refrigerants circulation by one.
4. the energy-saving and frequency-variable attemperating unit of refrigerating plant according to claim 1 is characterized in that, this first hot gas bypass circuit is an inlet by the frequency-changeable compressor end rear that spues, and the evaporimeter front end connects for outlet.
5. the energy-saving and frequency-variable attemperating unit of refrigerating plant according to claim 1 is characterized in that, this second hot gas bypass circuit is an inlet by the frequency-changeable compressor end rear that spues, and the evaporimeter rear connects for outlet.
6. the energy-saving and frequency-variable attemperating unit of refrigerating plant according to claim 1 is characterized in that, this working fluid refers to one of them of pure water, bittern and cold oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101877848A CN101769662B (en) | 2008-12-31 | 2008-12-31 | Frequency conversion energy-saving temperature control device of refrigerating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101877848A CN101769662B (en) | 2008-12-31 | 2008-12-31 | Frequency conversion energy-saving temperature control device of refrigerating device |
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| Publication Number | Publication Date |
|---|---|
| CN101769662A CN101769662A (en) | 2010-07-07 |
| CN101769662B true CN101769662B (en) | 2011-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101877848A Active CN101769662B (en) | 2008-12-31 | 2008-12-31 | Frequency conversion energy-saving temperature control device of refrigerating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104748325A (en) * | 2015-03-17 | 2015-07-01 | 广东申菱空调设备有限公司 | Air cooling air conditioner with full fresh air and control method for improving outlet air temperature precision thereof |
| CN107401864B (en) * | 2017-09-08 | 2023-09-19 | 珠海格力电器股份有限公司 | Anti-freezing cooling system and anti-freezing cooling control method |
| CN107560282B (en) * | 2017-09-15 | 2019-10-22 | 珠海格力电器股份有限公司 | The control method of cooling system |
| CN107975992A (en) * | 2017-11-23 | 2018-05-01 | 宁波杭州湾新区祥源动力供应有限公司 | A kind of cold supply system for workshop |
| US20210047773A1 (en) * | 2019-08-14 | 2021-02-18 | Lg Electronics Inc. | Apparatus for controlling clothes treating apparatus, clothes treating apparatus and method for controlling clothes treating apparatus |
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2008
- 2008-12-31 CN CN2008101877848A patent/CN101769662B/en active Active
Non-Patent Citations (5)
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| JP实开平4-90857U 1992.08.07 |
| JP实开昭48-10040 1973.02.03 |
| JP特开2004-20160A 2004.01.22 |
| JP特开2005-207719A 2005.08.04 |
| JP特开平7-218054A 1995.08.18 |
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| CN101769662A (en) | 2010-07-07 |
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