CN1284609A - Speed changeable compressor drive - Google Patents
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- CN1284609A CN1284609A CN 99117972 CN99117972A CN1284609A CN 1284609 A CN1284609 A CN 1284609A CN 99117972 CN99117972 CN 99117972 CN 99117972 A CN99117972 A CN 99117972A CN 1284609 A CN1284609 A CN 1284609A
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Abstract
The present invention relates to one kind of variable-speed compressor drivers, which regulates the operating speed of the compressor accurately on the sensed high and low pressure of the compressor and the temperature and pressure values in refrigerator system. The compressor is made to operate in the state of very low power consumption while meeting the requirement of load without damage caused by overheat, overload or overflow temperature resulting in freeze. The present invention can reach the aim of saving power and protecting compressor.
Description
The present invention relates to a kind of speed changeable compressor drive.
The power supply of general cooling air system mainly is to consume in the running of compressor, because compressor is the main member of cooling air system, therefore, seems of crucial importance for the power saving and the protective measure of compressor in the design of cooling air system.For example; in the separate cold system of one-to-many, has only an indoor set in use, when meeting the start condition; compressor must be started shooting; load this moment is very little, may have only fully loaded 20% (20), if what control compressor does not have; low utilization rate 20%; compressor also can consume 90% rated electrical, saves the energy so control compressor effectively, and the protection compressor is a letter important topic to be solved.
Purpose of the present invention promptly is to provide a kind of speed changeable compressor drive, and it can control and protect compressor effectively, and saves electric energy.
The object of the present invention is achieved like this, a kind of speed changeable compressor drive, it is used to control the compressor of a cooling air system, this cooling air system has high pressure, the low voltage value that a sensor comes the sensing compressor, so that being provided, this driver controls the running speed of this compressor, described driver comprises: an analog digital converting unit, and it converts the high and low pressure value of sensing to digital value; An and control unit, be used to receive of the running of high and low pressure digital value with the control compressor, it is a speed of adjusting compressor according to the difference of high and low pressure, the difference perseverance that makes high and low pressure is greater than one first setting value, and optionally whether whether adjusts the speed of compressor in the permissible range of one the 3rd setting value at the permissible range of one second setting value and high-voltage value according to low voltage value.
Above-mentioned speed changeable compressor drive, wherein, control unit also provides the emergency safeguard measure to compressor, so that check after adjusting compressor rotary speed whether compressor exceeds its operating range.
Purpose of the present invention also can realize like this, a kind of speed changeable compressor drive, it is used to control the compressor of a separate cold machine, these separate cold facility have a sensor, the high pressure of its sensing compressor, low voltage value, the temperature of air, the temperature that spues of compressor, the temperature of the condenser of separate cold system and the temperature of vaporizer, so that being provided, driver controls the running speed of this compressor, described driver comprises: an analog digital converting unit, with the high pressure of the compressor of sensing, low voltage value, the temperature of air, the temperature that spues of compressor, the temperature of the condenser of separate cold machine and the temperature transition of vaporizer become digital value; An and control unit; be used to receive the running of digital value that analog digital converting unit provides with the control compressor; it is to adjust the speed of compressor according to the difference of high and low pressure; the difference perseverance that makes high and low pressure is greater than one first setting value; and optionally according to low voltage value whether at the permissible range of one second setting value and high-voltage value whether in the permissible range of one the 3rd setting value to adjust the speed of compressor; and after adjusting compressor rotary speed, provide a urgent protection loop check, whether exceed its operating range with the examination compressor to compressor.
Above-mentioned speed changeable compressor drive wherein, protects promptly loop check is whether the temperature of spue temperature and air of temperature, the compressor of temperature, the condenser of the high-voltage value of checking compressor in regular turn, low voltage value, vaporizer exceeds the scope of setting.
Purpose of the present invention also can realize like this, a kind of speed changeable compressor drive, it is used to control the compressor of a ventilation type frozen water machine, these ventilation type frozen water facility have a sensor, the high pressure of its sensing compressor, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of ventilation type frozen water machine and the temperature of condenser, so that being provided, driver controls the running speed of compressor, described driver comprises: an analog digital converting unit, with the high pressure of the compressor of this sensing, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of ventilation type frozen water machine and the temperature transition of condenser become digital value; An and control unit; be used to receive the running of digital value that analog digital converting unit provides with the control compressor; it is whether to start compressor according to the height of water-exit temperature with decision; according to the compressor height; the difference of low pressure is adjusted the speed of compressor; make height; the difference perseverance of low pressure is greater than one first setting value; and optionally whether whether adjust the speed of compressor in the permissible range of one the 3rd setting value at the permissible range of one second setting value and high-voltage value according to low voltage value; and after adjusting compressor rotary speed, provide a urgent protection loop check, whether exceed its operating range with the examination compressor to compressor.
Above-mentioned speed changeable compressor drive wherein, protects promptly loop check is whether the water-exit temperature of high-voltage value, low voltage value and the ventilation type frozen water machine of checking compressor in regular turn exceeds the scope of setting.
Purpose of the present invention also can realize like this, a kind of speed changeable compressor drive, it is used to control the screw compressor of a water-cooled frozen water machine, this screw compressor has one and adjusts the decrement that slide block is used for cold media air, this adjustment slide block is controlled by two solenoid valves, these water-cooled frozen water facility have a sensor, the high pressure of its sensing screw compressor, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of water-cooled frozen water machine and the temperature of condenser, so that being provided, driver controls the running speed of screw compressor, described driver comprises: an analog digital converting unit, with the high pressure of the compressor of sensing, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of water-cooled frozen water machine and the temperature transition of condenser become digital value; An and control unit; be used to receive the running of digital value that analog digital converting unit provides with the control screw compressor; it is a boot program of finishing screw compressor with the keying of controlling two solenoid valves; height according to water-exit temperature determines whether this screw compressor is loaded; and when screw compressor be when being in holding state; then according to this compressor height; the difference of low pressure is to adjust the speed of this screw compressor; make this height; the difference perseverance of low pressure is greater than one first setting value; and according to the motor winding temperature whether greater than one second setting value and optionally according to this low voltage value whether at the permissible range of one the 3rd setting value and high-voltage value whether in the permissible range of one the 4th setting value to adjust the speed of this screw compressor; and after adjusting compressor rotary speed, provide a urgent protection loop check, whether exceed its operating range with the examination screw compressor to screw compressor.
Above-mentioned speed changeable compressor drive wherein, protects promptly loop check is whether the water-exit temperature of high-voltage value, low voltage value and the water-cooled frozen water machine of checking compressor in regular turn exceeds the scope of setting.
Owing to adopted above-mentioned technical solution; also be; utilize the high and low pressure value of sensing compressor and all temps in the cooling air system, force value with guiding and adjust the running speed of compressor; make compressor at the state of low power consuming and just in time meet under the needs of load and turn round; can make compressor avoid overheated, overload or the low excessively injury of freezing of low pressure; with this, can reach the effect of saving the energy and protection compressor.
Further specify specific structural features of the present invention and purpose below in conjunction with accompanying drawing.
Fig. 1 is first embodiment's schematic representation that speed changeable compressor drive of the present invention is used for the separate cold machine;
Fig. 2 is the functional-block diagram of the speed changeable compressor frequency conversion drive in the first embodiment of the present invention;
Fig. 3 A is the pattern control flow chart in summer of the first embodiment of the present invention;
Fig. 3 B is the pattern control flow chart in winter of the first embodiment of the present invention;
Fig. 3 C is the urgent protection circuit controls flow chart of the first embodiment of the present invention;
Fig. 4 is second embodiment's schematic representation that speed changeable compressor drive of the present invention is used for ventilation type frozen water machine;
Fig. 5 is the functional-block diagram of the speed changeable compressor frequency conversion drive in the second embodiment of the present invention;
Fig. 6 A is the pattern control flow chart in summer of the second embodiment of the present invention;
Fig. 6 B is the pattern control flow chart in winter of the second embodiment of the present invention;
Fig. 6 C is the urgent protection circuit controls flow chart of the second embodiment of the present invention;
Fig. 7 is the 3rd embodiment's schematic representation that speed changeable compressor drive of the present invention is used to use the water-cooled frozen water machine of screw compressor;
Fig. 8 is the operating state constitutional diagram for two solenoid valves that are used to control screw compressor;
Fig. 9 is the functional-block diagram of the speed changeable compressor frequency conversion drive in the third embodiment of the present invention;
Figure 10 A be the third embodiment of the present invention summer pattern start and the control flow chart under the standby;
Figure 10 B be the third embodiment of the present invention winter pattern start and the control flow chart under the standby;
Figure 10 C be after the start of the third embodiment of the present invention and the control flow chart that stops two;
Figure 10 D is the urgent protection circuit controls flow chart of the third embodiment of the present invention.
At first please refer to Fig. 1, speed changeable compressor drive of the present invention is used for the embodiment of separate cold machine, wherein it has comprised heat exchanger 11, compressor 12 and the expansion valve 13 of the outdoor unit of separate cold machine and the heat exchanger 14 of indoor set, and compressor 12 is subjected to a driver 15 control actions.When the separate cold machine is done air conditioner startup use (being the pattern in summer), at first open compressor 12, the compressed gaseous refrigerant makes it become the High Temperature High Pressure gaseous coolant, enter the heat exchanger 11 of outdoor unit, at this moment, heat exchanger 11 is a condenser, heat in the cold media air of High Temperature High Pressure is distributed, condense into liquid refrigerants then, the effect via expansion valve 13 flows away some refrigerants that condense again, and reduces the excess pressure of cold media air, be used as gasification in the heat exchanger 14 of indoor set of vaporizer when the refrigerant of liquid state and behind the supply cold air, gaseous coolant enters compressor again and recompresses, and so, finishes a complete circulating cold air process.When the separate cold machine is used as warming machine startup use (being the pattern in winter), its direction of operating with make air conditioner and use just in time opposite, the refrigerant of High Temperature High Pressure is imported into the heat exchanger 14 interior liquefaction of the indoor set of being used as condenser, and supply heating installation, liquid refrigerants is again via the effect of expansion valve 13, enter as heat absorption and evaporation in the heat exchanger 11 of the outdoor unit of vaporizer, recompress and form a heating installation cyclic process entering compressor at last.
The present invention has used a sensor 16 and a driver 15 critically to control the act of operation of cold medium compressor, reaches to save the energy and protection compressor 12.The functional-block diagram of Fig. 2 display driver 15, one analog digital converting unit 21, it is with 16 sensings of sensor, temperature input (promptly by radiator institute sensed temperature not shown in the figures), the low pressure input, high-pressure input, the temperature that compressor spues, the temperature of condenser and the analogues value such as temperature of vaporizer that comprise air are converted to digital value, handle for control unit 22, with 12 actions of control compressor, again by a frequency conversion module 23 actual runnings of controlling compressor.
The detailed control flow of control unit 22 is seen Fig. 3 A to Fig. 3 C; at first please refer to Fig. 3 A; after compressor 12 starts; if summer is during pattern; then check the height of compressor 12; whether low differential pressure surpasses a range of set value (being set point 1+ admissible value); if for denying; represent promptly that pressure difference is too little and enough kinetic energy can't be provided; carry out a urgent protection loop check after compressor 12 must being quickened this moment again; and when the height of aforementioned compressor 12; low differential pressure is when surpassing set point 1; then expression system has minimum kinetic energy; need this moment to check whether the evaporating pressure of vaporizer is suitable; that is whether the low voltage value of checking compressor 12 is that a suitable evaporating pressure value is a set point 2; satisfy the condition that space heat moves with the pressure of regulating in the vaporizer; whether surpass set point 2+ admissible value so check the low voltage value of compressor earlier; if the result who checks is for being; then gather way and promptly protect loop check; if the result who checks is for denying; whether low pressure that then continue to check compressor 12 is little than set point 2-admissible value; if not; then expression system works well; compressor 12 still keeps former speed and promptly protects loop check; if and the result who checks is for being then to need loop check is promptly protected in compressor 12 decelerations again.And be enabled in winter during pattern when compressor 12; its control flow then please refer to Fig. 3 B; at first check the height of compressor 12; whether low differential pressure surpasses a range of set value (being set point 1+ admissible value); if for denying; be about to carry out again after compressor 12 quickens a urgent protection loop check; if for being; then continue to check whether the high pressure of compressor 12 is a suitable running high-voltage value (being set point 7); so that system can be suitable high pressure and high temperature heating installation is provided; whether the high pressure of promptly checking compressor 12 earlier is less than set point 7-admissible value; if the result who checks is for being; then compressor 12 is quickened promptly to protect loop check again; if and the result who checks is not, continue then to check whether the high pressure of compressor 12 surpasses set point 7+ admissible value, as denying; then expression system works well; compressor 12 still keeps former speed and promptly protects loop check, and if the result who checks for being then to need loop check is promptly protected in compressor 12 decelerations again.Control flow as for urgent protection loop check then please refer to Fig. 3 C; it is whether the high pressure that is used for checking in regular turn compressor 12 exceeds the highest high-voltage value of setting and promptly set 4; whether the high pressure of compressor 12 is lower than a minimum high-voltage value of setting is promptly set 5; whether the low pressure of compressor 12 is higher than high low pressure value of setting is promptly set 8; the low pressure temperature of compressor 12 (is the evaporator temperature of summer during pattern; winter the condenser temperature during pattern) whether set 10 greater than high low pressure temperature of setting; whether the temperature that spues of compressor 12 is promptly set 9 greater than the highest temperature of setting that spues and whether is promptly set 11 greater than high ambient temperature of setting with heat radiation row's temperature; if aforesaid check result is not, then showing temperature; pressure all meets.
Impose a condition, can continue follow-up control flow, if but aforesaid arbitrary check result for being, then expression has unusual condition to take place, compressor 12 must stoppage protections, and could start shooting again after replacement.By aforesaid control flow as can be known, its control mode mainly is to consider the high and low pressure reduction of compressor 12, to keep the minimum kinetic energy of system, again and then consider the high and low pressure of compressor 12, running speed with guiding and adjustment compressor 12, make compressor 12 operate at the needs that hang down very much the state of the energy and just in time meet load, regulate the running speed of compressor 12, can save the energy more than 50% with this.
Please refer to Fig. 4 again, speed changeable compressor drive of the present invention is used for the embodiment of ventilation type frozen water machine, it comprises a heat exchanger coil 41, compressor 42, expansion valve 43 and plate type heat exchanger 44, its working principle is suitable with last embodiment, and the hot and cold gas that promptly passes through plate type heat exchanger 44 generations is to make hot water or frozen water.Similarly; the act of operation that the present invention also provides a sensor 46 and a driver 45 critically to control cold medium compressor 42 reaches the purpose of saving the energy and protection compressor 42; the functional-block diagram of Fig. 5 display driver 45; one analog digital converting unit 51 will be by sensor institute sensing; comprise the temperature input of air; the low pressure input; the high-pressure input; the temperature that compressor spues; the temperature of condenser and the analogues value such as temperature of frozen water are converted to digital value; for the action that control unit 52 is handled with control compressor 42, carry out the actual running of controlling compressor 42 by a frequency conversion module 53 again.
Control unit 52 is by checking the height of compressor 42; low voltage value; height pressure reduction; the temperature that spues of compressor; the temperature of condenser; the temperature of frozen water and the air temperature of environment; the running control and the protection mechanism of compressor 42 are provided; the detailed control flow of control unit 52 is referring to Fig. 6 A to Fig. 6 C; at first please refer to Fig. 6 A; after compressor 42 starts; if summer is during pattern; check earlier that then whether the frozen water output temperature is greater than the highest frozen water temperature (promptly setting the 3+ admissible value) of setting; as the result who checks is not; represent that then water temperature is enough low; needn't start compressor 42; as the result that checks for being; then expression needs to reduce water temperature to make frozen water; promptly start the running speed of compressor 42 to 100% this moment; reexamine the height of compressor 42; whether low differential pressure surpasses a range of set value (being set point 2+ admissible value); if for not being about to carry out a urgent protection loop check after compressor 42 quickens again; and when the height of aforementioned compressor 42; low differential pressure is when surpassing set point; whether the low voltage value that then reexamines compressor 42 is a suitable running low voltage value (being set point 1); to guarantee that compressor 42 keeps optimum efficiency; whether the low voltage value of promptly checking compressor 42 is higher than set point 1+ admissible value; if the result who checks is for being; then gather way and promptly protect loop check; if the result who checks is for denying; whether low voltage value that then continue to check compressor 42 is little than set point 1-admissible value; as otherwise the expression system work well; compressor 42 still keeps former speed and promptly protects loop check; if and the result who checks is for being then to need loop check is promptly protected in compressor 42 decelerations again.And started winter during pattern when compressor 42; please refer to Fig. 6 B; check that at first whether hot water output temperature T is less than a minimum hot water temperature (promptly setting the 3-admissible value) who sets; as the result who checks is not; represent that then water temperature is enough high; needn't start compressor 42; as the result that checks for being; then expression needs to improve water temperature to make hot water; promptly start the running speed of compressor 42 to 100% this moment; reexamine the height of compressor 42; whether low differential pressure surpasses a range of set value (being set point 2+ admissible value); if for not being about to carry out a urgent protection loop check after compressor 42 quickens again; and when the height of aforementioned compressor 42; low differential pressure is when surpassing set point 2+ admissible value; whether the high-voltage value that then reexamines compressor 42 is that a suitable running high-voltage value is a set point 4; to keep the stable supply of heating installation; that is whether the high-voltage value of checking compressor 42 is lower than set point 4-admissible value; if the result who checks is for being; then gather way and promptly protect loop check; if the result who checks is for denying; then continue again to check that whether the high-voltage value of compressor 42 is greater than set point 4+ admissible value; if the result who checks is for denying; the expression system works well; compressor 42 still keeps former speed and promptly protects loop check; if and the result who checks is for being then to need loop check is promptly protected in compressor 42 decelerations again.Control flow as for this urgent protection loop check then please refer to Fig. 6 C; it is whether to exceed the highest high-voltage value of setting in order to the high pressure of checking compressor 42 in regular turn promptly to set 8; whether the high pressure of compressor is lower than a minimum high-voltage value of setting is promptly set 5; whether the low pressure of compressor is lower than a minimum low voltage value of setting is promptly set 6; water-exit temperature whether be lower than a minimum water-exit temperature of setting promptly set 7 and water-exit temperature whether be higher than a maximum water temperature of setting and promptly set 9; if aforesaid check result is not; show that then compressor 42 does not exceed its operating range; can continue follow-up control flow; if but aforesaid arbitrary check result is for being; then expression has unusual condition to take place; then print corresponding each code of unusual condition " PHT "; " LPHT "; " LPLT "; " LTT "; " HTT "; and with compressor 42 stoppage protections; at this moment, compressor 42 needs could start shooting again after replacement.By aforesaid control flow as can be known, its control mode also mainly is to consider the minimum of the height pressure reduction of compressor 42, under any situation, all need keep this condition, again and then consider the high and low pressure of compressor 42, running speed with guiding and adjustment compressor 42 operates under the state that hangs down the energy and so that the hot water or cold water to be provided compressor 42.
Speed changeable compressor drive of the present invention also can apply to screw compressor, because of on screw compressor, having one to adjust slide block, this slide block is the decrement that is used for adjusting cold media air, when gas the more is compressed, the more load needs, the control of slide block can be utilized, the decrement of how many cold media air can be determined.Fig. 7 shows the embodiment who the present invention is applied to the water-cooled frozen water machine of a use screw compressor, it is to use two solenoid valve SV1, SV2 controls the action of slide block 63, and these two solenoid valve SV1, the switching of SV2, the time that opens and closes with when be activated or stop promptly to be controlled by a driver 64, Fig. 8 shows two solenoid valve SV1, the operating state combination of SV2, the functional block diagram of Fig. 9 display driver 64, one analog digital converting unit 91 will be by sensor (not shown) institute sensing, comprise the temperature input of air, motor temperature, the low pressure input, the high-pressure input, the temperature that screw compressor spues, the temperature of condenser and the analogues value such as temperature of frozen water are converted to digital value, handle action for control unit 92 with control slide block 63 and decision screw compressor, and by a frequency conversion module 93 with the actual running of controlling screw compressor.
By aforesaid control flow as can be known, its control mode also is to adjust its rotating speed to improve running efficiency with the high and low pressure of screw compressor, and be combined with orderliness and the advancing and retreat of moving slider 63 critically, and so that the state that screw compressor operates at the low energy down and supply chilled water.
Claims (8)
1. speed changeable compressor drive, it is used to control the compressor of a cooling air system, it is characterized in that: this cooling air system has high pressure, the low voltage value that a sensor comes the sensing compressor, so that being provided, this driver controls the running speed of this compressor, described driver comprises: an analog digital converting unit, and it converts the high and low pressure value of sensing to digital value; An and control unit, be used to receive of the running of high and low pressure digital value with the control compressor, it is a speed of adjusting compressor according to the difference of high and low pressure, the difference perseverance that makes high and low pressure is greater than one first setting value, and optionally whether whether adjusts the speed of compressor in the permissible range of one the 3rd setting value at the permissible range of one second setting value and high-voltage value according to low voltage value.
2. speed changeable compressor drive according to claim 1 is characterized in that: described control unit also provides the emergency safeguard measure to compressor, to check after adjusting compressor rotary speed whether compressor exceeds its operating range.
3. speed changeable compressor drive, it is used to control the compressor of a separate cold machine, it is characterized in that: these separate cold facility have a sensor, the high pressure of its sensing compressor, low voltage value, the temperature of air, the temperature that spues of compressor, the temperature of the condenser of separate cold system and the temperature of vaporizer, so that being provided, driver controls the running speed of this compressor, described driver comprises: an analog digital converting unit, with the high pressure of the compressor of sensing, low voltage value, the temperature of air, the temperature that spues of compressor, the temperature of the condenser of separate cold machine and the temperature transition of vaporizer become digital value; An and control unit; be used to receive the running of digital value that analog digital converting unit provides with the control compressor; it is to adjust the speed of compressor according to the difference of high and low pressure; the difference perseverance that makes high and low pressure is greater than one first setting value; and optionally according to low voltage value whether at the permissible range of one second setting value and high-voltage value whether in the permissible range of one the 3rd setting value to adjust the speed of compressor; and after adjusting compressor rotary speed, provide a urgent protection loop check, whether exceed its operating range with the examination compressor to compressor.
4. speed changeable compressor drive according to claim 3 is characterized in that: described urgent protection loop check is whether the temperature of spue temperature and air of temperature, the compressor of temperature, the condenser of the high-voltage value of checking compressor in regular turn, low voltage value, vaporizer exceeds the scope of setting.
5. speed changeable compressor drive, it is used to control the compressor of a ventilation type frozen water machine, it is characterized in that: these ventilation type frozen water facility have a sensor, the high pressure of its sensing compressor, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of ventilation type frozen water machine and the temperature of condenser, so that being provided, driver controls the running speed of compressor, described driver comprises: an analog digital converting unit, with the high pressure of the compressor of this sensing, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of ventilation type frozen water machine and the temperature transition of condenser become digital value; An and control unit; be used to receive the running of digital value that analog digital converting unit provides with the control compressor; it is whether to start compressor according to the height of water-exit temperature with decision; according to the compressor height; the difference of low pressure is adjusted the speed of compressor; make height; the difference perseverance of low pressure is greater than one first setting value; and optionally whether whether adjust the speed of compressor in the permissible range of one the 3rd setting value at the permissible range of one second setting value and high-voltage value according to low voltage value; and after adjusting compressor rotary speed, provide a urgent protection loop check, whether exceed its operating range with the examination compressor to compressor.
6. speed changeable compressor drive according to claim 5 is characterized in that: described urgent protection loop check is whether the water-exit temperature of high-voltage value, low voltage value and the ventilation type frozen water machine of checking compressor in regular turn exceeds the scope of setting.
7. speed changeable compressor drive, it is used to control the screw compressor of a water-cooled frozen water machine, it is characterized in that: this screw compressor has one and adjusts the decrement that slide block is used for cold media air, this adjustment slide block is controlled by two solenoid valves, these water-cooled frozen water facility have a sensor, the high pressure of its sensing screw compressor, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of water-cooled frozen water machine and the temperature of condenser, so that being provided, driver controls the running speed of screw compressor, described driver comprises: an analog digital converting unit, with the high pressure of the compressor of sensing, low voltage value, the temperature of air, the temperature that spues of compressor, the water-exit temperature of water-cooled frozen water machine and the temperature transition of condenser become digital value; An and control unit; be used to receive the running of digital value that analog digital converting unit provides with the control screw compressor; it is a boot program of finishing screw compressor with the keying of controlling two solenoid valves; height according to water-exit temperature determines whether this screw compressor is loaded; and when screw compressor be when being in holding state; then according to this compressor height; the difference of low pressure is to adjust the speed of this screw compressor; make this height; the difference perseverance of low pressure is greater than one first setting value; and according to the motor winding temperature whether greater than one second setting value and optionally according to this low voltage value whether at the permissible range of one the 3rd setting value and high-voltage value whether in the permissible range of one the 4th setting value to adjust the speed of this screw compressor; and after adjusting compressor rotary speed, provide a urgent protection loop check, whether exceed its operating range with the examination screw compressor to screw compressor.
8. speed changeable compressor drive according to claim 7 is characterized in that: described urgent protection loop check is whether the water-exit temperature of high-voltage value, low voltage value and the water-cooled frozen water machine of checking compressor in regular turn exceeds the scope of setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99117972 CN1284609A (en) | 1999-08-11 | 1999-08-11 | Speed changeable compressor drive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99117972 CN1284609A (en) | 1999-08-11 | 1999-08-11 | Speed changeable compressor drive |
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| CN1284609A true CN1284609A (en) | 2001-02-21 |
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| CN 99117972 Pending CN1284609A (en) | 1999-08-11 | 1999-08-11 | Speed changeable compressor drive |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458294C (en) * | 2006-12-01 | 2009-02-04 | 珠海格力电器股份有限公司 | Output control method for compressor of ice storage unit |
| CN102278802A (en) * | 2011-07-19 | 2011-12-14 | 深圳市易网通通信技术有限公司 | Minus 48V direct current frequency-conversion speed-regulation temperature control system |
| WO2012131709A1 (en) * | 2011-03-28 | 2012-10-04 | Praveen Shankar JAMBHOLKAR | Adaptive speed control of compressor motor |
| CN102519187B (en) * | 2007-10-08 | 2014-12-31 | 艾默生环境优化技术有限公司 | System and method for calibrating parameters for a refrigeration system having a variable speed compressor |
| CN105953488A (en) * | 2016-03-25 | 2016-09-21 | 合肥天鹅制冷科技有限公司 | Control device for high speed motor refrigerating machine of air compression refrigeration system |
| US10962009B2 (en) | 2007-10-08 | 2021-03-30 | Emerson Climate Technologies, Inc. | Variable speed compressor protection system and method |
| US11206743B2 (en) | 2019-07-25 | 2021-12-21 | Emerson Climate Technolgies, Inc. | Electronics enclosure with heat-transfer element |
-
1999
- 1999-08-11 CN CN 99117972 patent/CN1284609A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458294C (en) * | 2006-12-01 | 2009-02-04 | 珠海格力电器股份有限公司 | Output control method for compressor of ice storage unit |
| CN102519187B (en) * | 2007-10-08 | 2014-12-31 | 艾默生环境优化技术有限公司 | System and method for calibrating parameters for a refrigeration system having a variable speed compressor |
| US10962009B2 (en) | 2007-10-08 | 2021-03-30 | Emerson Climate Technologies, Inc. | Variable speed compressor protection system and method |
| WO2012131709A1 (en) * | 2011-03-28 | 2012-10-04 | Praveen Shankar JAMBHOLKAR | Adaptive speed control of compressor motor |
| CN102278802A (en) * | 2011-07-19 | 2011-12-14 | 深圳市易网通通信技术有限公司 | Minus 48V direct current frequency-conversion speed-regulation temperature control system |
| CN105953488A (en) * | 2016-03-25 | 2016-09-21 | 合肥天鹅制冷科技有限公司 | Control device for high speed motor refrigerating machine of air compression refrigeration system |
| US11206743B2 (en) | 2019-07-25 | 2021-12-21 | Emerson Climate Technolgies, Inc. | Electronics enclosure with heat-transfer element |
| US11706899B2 (en) | 2019-07-25 | 2023-07-18 | Emerson Climate Technologies, Inc. | Electronics enclosure with heat-transfer element |
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