CN100404981C - Refrigeration system control equipment and its control method - Google Patents
Refrigeration system control equipment and its control method Download PDFInfo
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- CN100404981C CN100404981C CNB200510114361XA CN200510114361A CN100404981C CN 100404981 C CN100404981 C CN 100404981C CN B200510114361X A CNB200510114361X A CN B200510114361XA CN 200510114361 A CN200510114361 A CN 200510114361A CN 100404981 C CN100404981 C CN 100404981C
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000004044 response Effects 0.000 claims description 17
- 238000013461 design Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 3
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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Abstract
A method for controlling refrigeration system includes fetching detection value of system temperature, comparing said detection value with preset temperature range, outputting start-up signal of compressor through output contact connected with relay when detection value is greater than top limitation of preset temperature range then returning to step of fetching detection value. The control device used for realizing said method is also disclosed.
Description
Technical field
The present invention relates to refrigeration system, especially relate to the control appliance of refrigeration system.The present invention also provides a kind of control method that is applied to this control appliance simultaneously.
Background technology
In the refrigeration system of some specific use, extremely strict to the control range requirement of system temperature.For example: the temperature inside the box that blood is preserved case need be controlled at 4 ± 1 ℃, if temperature is left this scope, blood just may lose medical value very soon.
Refrigeration system realizes that the method for said temperature control is frequent start-stop compressor at present.During near temperature upper limit, start cooling compressor at the temperature inside the box immediately; When compressor operating after the some time, system temperature near the control temperature following in limited time, then stop the work of compressor.Under this working method, the common 5-10min of compressor will finish a start-stop cycle.Because temperature control is accurately had relatively high expectations, functional requirement also very comprehensive (needing functions such as automatic defrosting, warning usually), this kind equipment generally uses electronic controller.At present in the electronic controller the widely used relay life-span be generally 100,000 surplus time, the each start-stop of compressor, this relay also need closure, turn-off once.If 10 minutes start-stops of compressor once, then be approximately 1.9 years the mathematic(al) expectation of this relay, far below the service life of other parts of refrigeration plant 8-10.Simultaneously, because this relay is general and electronic controller is integrated on the circuit board, should not change, therefore, this relay has reduced the service life of whole electronic controller, and the operating cost of refrigeration system is raise.What is more important after electronic controller breaks down, as can't on-call maintenance, may cause refrigeration system in time to resume work, and the valuables of wherein preserving are damaged, and causes damage.
Summary of the invention
At above-mentioned defective, the invention provides and a kind ofly can prolong the electronic controller device in service life, it is short in system's influence of non-failure operation time service life that this circuit can solve relay, improves the service life of refrigeration plant electronic controller.
Refrigeration system control equipment provided by the invention comprises:
Controller is used to control the work of refrigeration system; Comprise reading system desired temperature and system temperature measured value, and judge whether in view of the above to start compressor; If, then by output contact output compressor start signal;
Relay, its relay coil connects the output contact of controller, by the dead electricity that gets of described this coil of compressor start signal controlling; Its contact switch one end connects compressor power, and the other end connects compressor;
Described relay is more than two, and each relay is the output contact of a controller of separate connection respectively; When described controller starts compressor at every turn, by above-mentioned output contact output compressor start signal.
Preferably, described controller starts compressor at every turn, adopts mode in turn to select one in described and the output contact that relay is connected to export described compressor start signal.
A kind of control method that is used for described refrigeration system control equipment comprises:
Step 31, controller reading system temperature detection value;
Step 32, controller compares system temperature detected value and design temperature scope, when the system temperature detected value is higher than going up in limited time of described design temperature scope, then enters step 33;
Step 33, controller by with output contact that relay is connected in one, output compressor start signal;
Step 34 is returned step 31.
Preferably, comprise the selection step before the described step 33, be used to select the output contact of described output compressor start signal.
Preferably, described selection step adopts the method for taking turns successively to select the output contact of each output compressor start signal.
Preferably, after the described step 33, detect relay and whether respond; If then return step 31; If not, then return the selection step, select other contact that is connected with relay to export described compressor start signal.
Preferably, whether described detection relay responds, and is that the auxiliary contact by relay provide the relay response signal to controller.
Preferably, whether described detection relay responds, and is after waiting for scheduled time t, and the reading system temperature detection value if this temperature detection value is higher than or equals the higher limit of system temperature setting value, judges that then relay does not respond.
Preferably, judge that at every turn a relay does not respond, wait for that then the scheduled time is set to 1/2 of the former wait scheduled time; After having treated the relay response, change the initial scheduled time value of setting t again into.
Preferably, comprise the step of rejecting power transfer relay in the described selection step, this step is defined as power transfer relay with the relay that several times do not respond the compressor start signal, no longer exports described compressor start signal from the output contact of this relay correspondence.
The present invention has following beneficial effect:
At first, the method that the present invention uses a plurality of relays to take turns to operate has solved the unmatched problem of life-span of relay service life and other device of refrigeration system, and making relay service life no longer is the bottleneck that influences refrigeration plant failure-free operation.
Secondly, owing to there are a plurality of relays to use, if a certain relay breaks down, system's operation is unlikely to interrupt, and is significant for the preservation of valuables.
Description of drawings
Fig. 1 is the circuit diagram of first embodiment of the invention;
Fig. 2 is the flow chart of first embodiment of the invention.
The specific embodiment
Please, be the schematic diagram of first embodiment of the invention referring to Fig. 1.This illustrates the circuit diagram of refrigeration system control equipment of the present invention.Part related to the present invention only is shown among the figure.
Refrigeration system control equipment circuit among Fig. 1 comprises controller 1, relay 2～relay 8.Wherein, controller 1 is the core cell that realization is controlled refrigeration system, comprises CPU 11 and register cell 12, and register cell 12 comprises some independently registers.This controller 1 can read user's design temperature scope, and the system temperature of reception temperature-measuring element acquisition, according to above-mentioned parameter, whether 1 pair of controller starts compressor judges, and according to the output contact output compressor start signal of judged result by being connected with relay.
Because controller 1 main performing a programme control can not directly realize the control to compressor, therefore, they need be by the start and stop of described relay 2～relay 8 control compressors, to realize the electrical isolation of strong, weak electricity.Concrete control mode be controller 1 by with output contact that relay 2～relay 8 is connected in one send the compressor start signal, control gets electric accordingly to relay coil, controlled the start and stop of compressor again by this relay.
Described controller 1 passes through its output contact C1, C3, C4, C5, C6, C7, C8 (output contact 2 is unsettled) shown in Fig. 1, external relay 2～relay 8, and the coil of relay 2～relay 8 is respectively J1～J7, contact switch is respectively K1～K7.Contact switch one end of these relays connects compressor operating power firestreak L, and the other end connects compressor power line M.Above-mentioned contact switch relay coil not be in off-state when electric.
Described relay gets the control of dead electricity and is controlled by output contact by controller 1.As shown in the figure, relay coil J1 one end of relay 1 connects the output contact C1 of controller, other end connection controller+12V power supply (controller power source+12V is its C9 pin, and in addition, controller pin C10 connects power supply ground GND).Wherein output contact C1 is connected with the power supply ground of controller by internal switch in controller inside.When controller need relay 1 when electric, then make the internal switch adhesive conducting of output contact C1 correspondence, relay coil J1 is connected with power supply ground by output contact C1, because its other end is connected all the time with power supply+12V positive pole, therefore, relay coil J1 must conduct, its contact switch K1 adhesive, and compressor gets electric work.
Described relay coil is reverse parallel connection diode D1～diode D7 respectively, and the induced potential that the effect of above-mentioned diode produces when being to the relay coil dead electricity provides discharge loop, avoids producing electromagnetic interference.
When the needs compressor operating, controller makes relay 2 take turns to such an extent that conduct to relay 8 at every turn, in order to avoid relay reaches service life too early because of frequent start-stop.Be 8～10 years the service life of refrigeration plant at present, and the adhesive number of times of relay is 100,000 times, therefore, once calculates with start-stop in 10 minutes, only need 5-7 relay to use in turn, can guarantee that under normal circumstances relay block has identical service life with other parts of refrigeration plant.If relay not to service life, the situation of relay abnormal failure promptly occurs, then can guarantee the still normally operation of whole refrigeration system control equipment.
Please referring to Fig. 2, described controller 1 is with following method control relay 2～relay 8 adhesives in turn.
Step S1, initialization.
This step comprises the zero clearing of relay mask register, and reads set temperature value.A register in the register cell 12 that described relay mask register is a controller.Its role is to provides the information of selecting which kind of relay to CPU 11.
Step S2, the reading system temperature detection value.
Controller is from temperature detection probe reading system temperature detection value.
Step S3, C.T detected value and set temperature value.
Judge whether described system temperature detected value is greater than or equal to the upper limit of set temperature value; If then enter step S4; If not, then return step S2.Described set temperature value is a temperature range, and this temperature range is according to the requirement decision that is saved thing, and it is narrower that the ratio that its scope can be set is saved the scope of temperature requirement of thing, so that refrigeration system guarantees temperature is controlled in the temperature required scope.
Step S4, inquiry relay mask register, the relay that selection should adhesive.
Described relay mask register is used to write down the relay that used last time number for inquiry, and according to the principle of using in turn, judges the current register that should select, and this result is outputed to the CPU of controller, and this unit is selective relay in view of the above.For selected relay, inquire about its not response record, if response record has not reached 15 times, then skip this relay, select next relay, till choosing a normal relay that uses.
Step S5 adds 1 with the value of relay mask register, so that select next relay next time.
Step S6, according to the result of step S4, output signal drives described selecteed register adhesive.
In this step, CPU 11 makes this relay adhesive from the output contact output low level signal corresponding to described selecteed register.
Step S7 reads the relay response message.
Described relay response message is used to judge whether relay responds.This information can be from the auxiliary contact of relay input controller one switching signal, is used to show whether adhesive of relay.In this case, the CPU relay response signal that reads input gets final product.
At present, many relays do not provide auxiliary contact, therefore, can stand-by period t, when time t had reached, the reading system measured temperature was as the relay response message.Described time t has more the situation of refrigeration system and sets with initial value, in control procedure, does not respond in order to prevent continuous relay, and it is temperature required to cause system temperature to surpass deposit, can according to circumstances change this value and (see step 10).
Step S8 judges whether adhesive of relay according to described relay response message; If then return step S2; If not, then enter step S9.
Described judge relay whether the method for adhesive according to the difference of relay response message and difference.When described relay response message is the switching signal of relay auxiliary contact, then judge according to this switching signal.
When described relay response message is the system temperature measured value, this measured temperature and the design temperature upper limit are compared, when the system temperature value is lower than the design temperature higher limit, then judge the relay adhesive, simultaneously described stand-by period t is reset to initial value; Prescribe a time limit when the system temperature measured value is greater than or equal on the design temperature, not work of compressor is described, judge not adhesive of relay.
Step S9 adds 1 with the not response record of this relay.
Controller writes down the not response record of each relay, whether has fault so that finally judge this relay.If the not response record of this relay reaches 15, perhaps other setting value judges that then this relay damages, and does not re-use (seeing step S4) later on.
Step S10 is re-set as 1/2nd of initial value with stand-by period t, and returns step S4.If the switching signal of using relay auxiliary contact is then directly returned step S4 as input signal.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. refrigeration system control equipment comprises:
Controller is used to control the work of refrigeration system; Comprise reading system desired temperature and system temperature measured value, and judge whether in view of the above to start compressor; If, then by output contact output compressor start signal;
Relay, its relay coil connects the output contact of controller, by the dead electricity that gets of described this coil of compressor start signal controlling; Its contact switch one end connects compressor power, and the other end connects compressor;
It is characterized in that described relay is more than two, each relay is the output contact of a controller of separate connection respectively; When described controller starts compressor at every turn, by above-mentioned output contact output compressor start signal.
2. refrigeration system control equipment according to claim 1 is characterized in that described controller starts compressor at every turn, adopts mode in turn to select one in described and the output contact that relay is connected to export described compressor start signal.
3. a control method that is used for the described refrigeration system control equipment of claim 1 is characterized in that, comprising:
Step 31, controller reading system temperature detection value;
Step 32, controller compares system temperature detected value and design temperature scope, when the system temperature detected value is higher than going up in limited time of described design temperature scope, then enters step 33;
Step 33, controller by with output contact that relay is connected in one, output compressor start signal;
Step 34 is returned step 31.
4. control method according to claim 3 is characterized in that, comprises the selection step before the described step 33, is used to select the output contact of described output compressor start signal.
5. control method according to claim 4 is characterized in that, described selection step adopts the method for taking turns successively to select the output contact of each output compressor start signal.
6. whether control method according to claim 4 is characterized in that, after the described step 33, detect relay and respond; If then return step 31; If not, then return the selection step, select other contact that is connected with relay to export described compressor start signal.
7. method according to claim 6 is characterized in that, whether described detection relay responds, and is that the auxiliary contact by relay provide the relay response signal to controller.
8. method according to claim 6 is characterized in that, whether described detection relay responds, be after waiting for scheduled time t, the reading system temperature detection value if this temperature detection value is higher than or equals the higher limit of system temperature setting value, judges that then relay does not respond.
9. method according to claim 8 is characterized in that, judges that at every turn a relay does not respond, and waits for that then the scheduled time is set to 1/2 of the former wait scheduled time; After having treated the relay response, change the initial scheduled time value of setting t again into.
10. control method according to claim 4, it is characterized in that, comprise the step of rejecting power transfer relay in the described selection step, this step is defined as power transfer relay with the relay that several times do not respond the compressor start signal, no longer exports described compressor start signal from the output contact of this relay correspondence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510114361XA CN100404981C (en) | 2005-10-24 | 2005-10-24 | Refrigeration system control equipment and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200510114361XA CN100404981C (en) | 2005-10-24 | 2005-10-24 | Refrigeration system control equipment and its control method |
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| CN1955623A CN1955623A (en) | 2007-05-02 |
| CN100404981C true CN100404981C (en) | 2008-07-23 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1292457A (en) * | 1968-11-12 | 1972-10-11 | Armour & Co | Feedback control system |
| JPS611943B2 (en) * | 1977-05-20 | 1986-01-21 | Nippon Kogaku Kk | |
| CN2064033U (en) * | 1989-09-06 | 1990-10-17 | 胡执冲 | Digital electronic temperature controlling protector of refrigerator |
| CN2333984Y (en) * | 1998-03-27 | 1999-08-18 | 海尔集团公司 | Refrigerator |
| US6318966B1 (en) * | 1999-04-06 | 2001-11-20 | York International Corporation | Method and system for controlling a compressor |
| CN2473573Y (en) * | 2001-02-21 | 2002-01-23 | 王和 | Computer controller for cold storage |
| CN2514257Y (en) * | 2001-11-09 | 2002-10-02 | 上海日立电器有限公司 | Central controller for double system small central air-conditioner |
| CN2893564Y (en) * | 2005-10-24 | 2007-04-25 | 海尔集团公司 | Refrigerating system control equipment |
-
2005
- 2005-10-24 CN CNB200510114361XA patent/CN100404981C/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1292457A (en) * | 1968-11-12 | 1972-10-11 | Armour & Co | Feedback control system |
| JPS611943B2 (en) * | 1977-05-20 | 1986-01-21 | Nippon Kogaku Kk | |
| CN2064033U (en) * | 1989-09-06 | 1990-10-17 | 胡执冲 | Digital electronic temperature controlling protector of refrigerator |
| CN2333984Y (en) * | 1998-03-27 | 1999-08-18 | 海尔集团公司 | Refrigerator |
| US6318966B1 (en) * | 1999-04-06 | 2001-11-20 | York International Corporation | Method and system for controlling a compressor |
| CN2473573Y (en) * | 2001-02-21 | 2002-01-23 | 王和 | Computer controller for cold storage |
| CN2514257Y (en) * | 2001-11-09 | 2002-10-02 | 上海日立电器有限公司 | Central controller for double system small central air-conditioner |
| CN2893564Y (en) * | 2005-10-24 | 2007-04-25 | 海尔集团公司 | Refrigerating system control equipment |
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| Publication number | Publication date |
|---|---|
| CN1955623A (en) | 2007-05-02 |
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Effective date of registration: 20091127 Address after: Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Province, China: 266101 Co-patentee after: Haier Medical and Laboratory Products Co., Ltd. Patentee after: haier group corporation Address before: Haier Industrial Park, 1 Haier Road, Qingdao hi tech Industrial Park, Shandong Province, China: 266101 Co-patentee before: Haier Group Technology Research and Development Center Patentee before: haier group corporation |
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Address after: 266101 Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Co-patentee after: Qingdao Haier Bio Medical Limited by Share Ltd Patentee after: haier group corporation Address before: 266101 Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Co-patentee before: Haier Medical and Laboratory Products Co., Ltd. Patentee before: haier group corporation |
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Effective date of registration: 20190124 Address after: 266555 Haier Industrial Park, Qingdao Economic Development Zone, Shandong Province Patentee after: Qingdao Haier Bio Medical Limited by Share Ltd Address before: 266101 Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Co-patentee before: Qingdao Haier Bio Medical Limited by Share Ltd Patentee before: haier group corporation |
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Effective date of registration: 20191226 Address after: 266000 Qingdao National University Science Park, No.127, huizhiqiao Road, high tech Zone, Qingdao, Shandong Province Patentee after: Qingdao Haite biomedical Co., Ltd Address before: 266555 Haier Industrial Park, Qingdao Economic Development Zone, Shandong Province Patentee before: Qingdao Haier Bio Medical Limited by Share Ltd |
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Address after: 266000 No. 280, Fengyuan Road, high tech Zone, Qingdao, Shandong Patentee after: Qingdao Haier Biomedical Technology Co.,Ltd. Address before: 266000 Qingdao National University Science Park, 127 huizhiqiao Road, high tech Zone, Qingdao City, Shandong Province Patentee before: Qingdao Haite biomedical Co.,Ltd. |
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