CN104251581A - Pump start control method, pump start control device, pump start control system and refrigerating system - Google Patents
Pump start control method, pump start control device, pump start control system and refrigerating system Download PDFInfo
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- CN104251581A CN104251581A CN201310269596.0A CN201310269596A CN104251581A CN 104251581 A CN104251581 A CN 104251581A CN 201310269596 A CN201310269596 A CN 201310269596A CN 104251581 A CN104251581 A CN 104251581A
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Abstract
The invention relates to the technical field of refrigeration and discloses a pump start control method, a pump start control device, a pump start control system and a refrigeration system. The pump start control method comprises the following steps: acquiring the superheat degree value of the current refrigeration system; when the superheat degree value of the refrigeration system is greater than a set first superheat degree threshold, controlling output parameters of a pump to increase a set first step length. According to the pump start control method, during pump start, the superheat degree is adopted as a parameter to gradually increase the output of the pump, so that impact of a large-flow refrigerant on the pump can be avoided, the cavitation risk during pump start is reduced, and the pump reliability is enhanced.
Description
Technical field
The present invention relates to refrigeration technology field, particularly relate to a kind of startup control method of pump, device, system and a kind of refrigeration system.
Background technology
In recent years, along with the continuous expansion of national communication network scale and userbase, the power consumption that communication enterprise equipment runs has become ever-increasing important cost.According to investigations, in machine room, only the operation power consumption of precision air conditioner just accounts for more than 50% of machine room total electricity consumption, and in the base station, modular bureau of One's name is legion, idle call electricity can reach about 70% of base station or modular bureau power consumption.Therefore, adopt rational comprehensive solution effectively to reduce air-conditioner power consumption and become the important directions reducing air conditioner in machine room energy consumption.
For air conditioner in machine room, the utilization rate adopting pump (i.e. the refrigeration system of pump and compressor compound) to improve natural cooling source at present has become a main method.Pump and compressor hybrid system, compared to original compressor assembly, are increase pumping system on compressor assembly, realize adopting pump circularly cooling at low temperature season.
As shown in Figure 1, Fig. 1 is existing pump and compressor composite refrigeration system structural representation, comprise and connect successively and form the compressor 21 of closed cycle, condenser 22, fluid reservoir 26, circulating pump 23, expansion valve 24 and evaporimeter 25, its operation principle is as follows: when outdoor temperature is higher, compressor assembly runs, bypass 31 and bypass 33 are closed, bypass 32 is opened, flow of refrigerant becomes steam through evaporimeter 25 heat absorption, high temperature and high pressure steam is become through compressor 21 acting, after becoming liquid to condenser 22 heat release, at expansion valve 24, place realizes reducing pressure by regulating flow, finally arrive evaporimeter and complete a compression mechanism SAPMAC method, when outside air temperature is lower, pumping system runs, bypass 31 and bypass 33 are opened, and bypass 32 is closed, and flow of refrigerant becomes gas through evaporimeter 25 by heat in absorption chamber, condenser 22 is arrived through bypass 31, heat release through condenser 22 becomes liquid, after arriving fluid reservoir 26, after the vapor-liquid separation of fluid reservoir, liquid refrigerant, through the boosting of circulating pump 23, arrives evaporimeter 25 finally by bypass 33 and completes a pumping system kind of refrigeration cycle.
The safe operation of circulating pump plays vital effect in the operation of refrigeration system, but easily there is cavitation in pump, in pumping system, the type of pump has multiple, be described for centrifugal pump at this, when centrifugal pump starts, the flow of refrigeration system increases suddenly, the cold-producing medium of large discharge can cause the impeller inlet speed of pump to increase, thus cause pump inlet to increase to the pressure drop of impeller section, when fluid pressure near impeller eye is less than or equal to the saturated vapour pressure under cold-producing medium delivery temperature, some liquid refrigerant is vaporized, also have the gas effusion be dissolved in liquid simultaneously, form a large amount of bubbles, bubble with liquid to be left in impeller pressure higher position again flash set crumble and fall, liquid around bubble pours rapidly the hole that bubble is formed, form powerful local high-frequency high pressure liquid hammer, the component of grievous injury pump, produce noise and vibration, the cavitation of Here it is pump.In present patent application file, no matter for centrifugal pump or the pump of other type, occur thisly to produce steam bubble when the liquid local pressure in runner drops to critical pressure in liquid, the accumulation of steam bubble, flowing, divide, the phenomenon that crumbles and fall is referred to as cavitation.Reduce the cavitation of pump at pumping system by the mode of the fluid reservoir adopting certain volume and frame height certain altitude at present, but pump cabinet floor space will be caused so comparatively large, increase investment.Also there is no other good methods to reduce cavitation during pump startup at present.
Summary of the invention
The invention provides a kind of startup control method of pump, device, system and a kind of refrigeration system, in order to reduce cavitation risk during pump startup, strengthen the reliability of pump.
The startup control method of pump in inventive refrigeration system, comprising:
Obtain the super heat value of current refrigeration system;
When the degree of superheat of refrigeration system is greater than the first degree of superheat threshold value of setting, the output parameter of control pump increases the first step-length of setting.
Preferably, the output parameter of described pump is the output percentage of the flow of pump, pump lift, the rotating speed of pump, the frequency of pump or pump, and wherein, the output percentage of described pump is the percentage when the output of front pump and the maximum output of pump.The output parameter of described pump is can by any one parameter of the output of the pump obtained that converts with the flow of pump.
Preferably, when the output parameter of described pump is the output percentage of pump, the first step of described setting is grown up in 0% and is less than 10%.
Preferably, the first step-length of described setting is 1%.
Preferably, the initial value of the output percentage of described pump is 10% ~ 50%.
Preferably, the initial value of the output percentage of described pump is 30%.
For the startup control method of above-mentioned pump, also comprise: when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, the output percentage of control pump reduces the second step-length of setting, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
Preferably, when the output parameter of described pump is the output percentage of pump, the second step of described setting is grown up in 0% and is less than 10%.
Preferably, the startup control method of described pump, also comprise: when the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting, control pump exports with the output parameter when front pump, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
The startup control system of pump of the present invention, in refrigeration system, described refrigeration system is comprised and to be connected successively by pipeline and to form the condenser of closed cycle, pump and evaporimeter, and have cold-producing medium in described pipeline, the startup control system of described pump comprises:
Degree of superheat checkout gear, is arranged on the pipeline between evaporator outlet and condenser inlet, for detecting the degree of superheat of refrigeration system;
Control device, is connected with described pump and degree of superheat checkout gear signal respectively, and during for being greater than the first degree of superheat threshold value of setting when the degree of superheat of refrigeration system, the output parameter of control pump increases the first step-length of setting.
Preferably, described degree of superheat checkout gear comprises:
Temperature sensor, is arranged at evaporator outlet, for detecting the temperature information of evaporator outlet;
Pressure sensor, is arranged at evaporator outlet, for detecting the pressure information of evaporator outlet;
Processor, is connected with described temperature sensor and pressure sensor signal respectively, for calculate detection pressure under the difference of the saturation temperature of cold-producing medium and the temperature of detection, obtain the degree of superheat of refrigeration system.
Preferably, described pump is frequency modulation pump or variable pressure pump.
The startup control device of pump of the present invention, in refrigeration system, comprising:
Acquisition equipment, for obtaining the super heat value of refrigeration system;
Control appliance, during for being greater than the first degree of superheat threshold value of setting when the degree of superheat of refrigeration system, the output parameter of control pump increases the first step-length of setting.
Preferably, described control appliance is further used for when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, and the output parameter of control pump reduces the second step-length of setting, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
Preferably, described control appliance is further used for when the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting, control pump exports with the output parameter when front pump, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
Inventive refrigeration system, comprises the startup control system of any one pump above-mentioned, also comprises:
Compressor in described closed cycle and between described condenser and evaporimeter;
Restricting element in described closed cycle and between described pump and evaporimeter.
Preferably, described refrigeration system, also comprises:
Fluid reservoir in described closed cycle and between described condenser and pump.
Preferably, described refrigeration system, also comprises:
By the flow-regulating components that the first bypass and described parallel connection of pumps are arranged.
Preferably, described refrigeration system, also comprises:
By the traffic organising valve member that the second bypass and described parallel connection of pumps are arranged.
Preferably, described refrigeration system, also comprises:
By the flow-regulating components that the first bypass and described parallel connection of pumps are arranged;
By the traffic organising valve member that the second bypass and described parallel connection of pumps are arranged.
In technical solution of the present invention, the output parameter of control pump progressively increases, the value added often walked is the first step-length of setting, due to the output parameter by progressively slowly increasing pump, thus the impact of cold-producing medium to pump of large discharge can be reduced, reduce the cavitation risk of pump startup, improve the reliability of pump, and adopt this parameter of the degree of superheat of refrigeration system to detect, the output parameter of control pump progressively increases with the step-length of setting, so just slowly can reduce the degree of superheat of refrigeration system, until the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting, now the flow of refrigeration system reaches the optimum flow with system matches.
Accompanying drawing explanation
Fig. 1 is pump and the compressor composite refrigeration system structural representation of prior art;
Fig. 2 is the startup control method schematic flow sheet of pump of the present invention;
Fig. 3 is the startup control method idiographic flow schematic diagram of pump of the present invention;
Fig. 4 is first embodiment of the invention refrigerant system configurations schematic diagram;
Fig. 5 is second embodiment of the invention refrigerant system configurations schematic diagram;
Fig. 6 is third embodiment of the invention refrigerant system configurations schematic diagram;
Fig. 7 is fourth embodiment of the invention refrigerant system configurations schematic diagram;
Fig. 8 is fifth embodiment of the invention refrigerant system configurations schematic diagram;
Fig. 9 is sixth embodiment of the invention refrigerant system configurations schematic diagram;
Figure 10 is seventh embodiment of the invention refrigerant system configurations schematic diagram;
Figure 11 is eighth embodiment of the invention refrigerant system configurations schematic diagram;
Figure 12 is ninth embodiment of the invention refrigerant system configurations schematic diagram;
Figure 13 is the pressure-enthalpy chart of pump intake refrigerant condition;
Figure 14 is pump performance curve map.
Reference numeral:
1-compressor 2-condenser 3-pump 4-restricting element
5-evaporimeter 6-temperature sensor 7-control device 8-flow-regulating components
9-traffic organising valve member 10-fluid reservoir 21-compressor 22-condenser
23-circulating pump 24-expansion valve 25-evaporimeter 31,32,33-bypass
Detailed description of the invention
In order to reduce the cavitation risk of pump startup, improving the reliability of pump, the invention provides a kind of startup control method of pump, device and system and a kind of refrigeration system.In this technical scheme, the output parameter of control pump progressively increases, the value added often walked is the first step-length of setting, owing to adopting the mode progressively slowly increasing the output parameter of pump, thus the impact of cold-producing medium to pump of large discharge can be reduced, reduce the cavitation risk of pump startup, improve the reliability of pump, and adopt this parameter of the degree of superheat of refrigeration system to detect, the output parameter of control pump progressively increases with the step-length of setting, so just slowly can reduce the degree of superheat of refrigeration system, until the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting, now the flow of refrigeration system reaches best mating with system.For making the object, technical solutions and advantages of the present invention clearly, the present invention is further detailed explanation below to lift specific embodiment.
In embodiments of the present invention, cavitation not only comprises the cavitation of centrifugal pump, and the phenomenon of similar Cavitation Occurred in Centrifugal Pumps occurs the pump also comprising other type.
Embodiments provide a kind of startup control method of pump, as shown in Figure 2, Fig. 2 is the startup control method schematic flow sheet of pump of the present invention, and the startup control method of described pump comprises:
Obtain the super heat value of current refrigeration system;
When the degree of superheat of refrigeration system is greater than the first degree of superheat threshold value of setting, the output parameter of control pump increases the first step-length of setting.
Specifically comprise the following steps:
The super heat value of step 101, acquisition current refrigeration system;
Step 102, judge whether the degree of superheat of refrigeration system is greater than the first degree of superheat threshold value of setting;
If so, then step 103 is performed; Otherwise, return step 101;
The output parameter of step 103, control pump increases the first step-length of setting.
In technical solution of the present invention, the output parameter of control pump increases step by step, the value added of each step is the first step-length of setting, owing to adopting the mode progressively slowly increasing the output parameter of pump, thus the impact of cold-producing medium to pump of large discharge can be reduced, reduce the cavitation risk of pump startup, improve the reliability of pump, and adopt this parameter of the degree of superheat of refrigeration system to detect, the output parameter of control pump progressively increases with the step-length of setting, so just slowly can reduce the degree of superheat of refrigeration system, until the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting, now the flow of refrigeration system reaches the optimum Match with system.In technical solution of the present invention, what adopt this parameter of the refrigeration system degree of superheat to carry out control pump outputs to optimum value, obtains the optimum flow of system, except adopting this parameter of the degree of superheat of refrigeration system, other parameter relevant to systematic function can also be adopted, as degree of supercooling.
Preferably, the output parameter of described pump is the output percentage of the flow of pump, pump lift, the rotating speed of pump, the frequency of pump or pump, wherein, the output percentage of described pump is the percentage when the output of front pump and the maximum output of pump, and the output of described pump is the parameter of the flow of pump, pump lift, the rotating speed of pump, the frequency of pump or any one pump relevant to the output of pump.
In technical solution of the present invention, the output parameter of pump is not limited to above-mentioned parameter, it can also be the parameter of any one pump with the flow of pump with conversion relation, main purpose is that the output parameter by slowly increasing pump prevents large discharge cold-producing medium to the impact of pump, reduces cavitation risk during pump startup.
Preferably, when the output parameter of described pump is the output percentage of pump, the first step of described setting is grown up in 0% and is not more than 10%; Preferably, the first step-length of described setting is 1%.
In technical solution of the present invention, in pump startup process, the increase of the output percentage of pump slowly increases according to certain rule, the output percentage of pump can increase by 0.1% at every turn, 0.2%, 1%, 3%, 5%, 7% or 10%, more excellent, the output percentage of pump increases by 1% at every turn, when pump increases according to the first step-length that this sets, the flow of pump increases gradually, the degree of superheat of refrigeration system reduces gradually, and the degree of superheat of refrigeration system is reduced to the first degree of superheat threshold value the second degree of superheat threshold value being greater than setting that are not more than setting, the flow of refrigeration system reaches optimum flow, system is in stable state, such refrigeration system reaches time of stable state can not be oversize, and pump also can not produce cavitation.
Preferably, the initial value arranging the output percentage of pump is 10% ~ 50%, and preferably, the initial value arranging the output percentage of pump is 30%.
In the inventive solutions, the initial value that can arrange the output percentage of pump is 10%, 15%, 20%, 30%, 35%, 40% or 50%; And the initial output percentage arranging pump is preferably 30%, this is due to the most of converter plants in practical application, and minimum variable frequency starting value is about 20%; And have the motor of some pumps to need the cooling of cold-producing medium, if flow too small machine can not get cooling also can be risky; And the flow too little time that also can increase the startup of pump, system can not settle out very soon, therefore, the initial value of the output ratio of preferred pump is 30%, allows the impact that initially can not be subject to large discharge of pump startup, improves the reliability of pump.
The startup control method of said pump, also comprises: when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, and the output parameter of control pump reduces the second step-length of setting, and described second degree of superheat threshold value is less than the first degree of superheat threshold value of setting.When the output parameter of described pump is the output percentage of pump, the second step of described setting is grown up in 0% and is less than 10%, is preferably 1%.
The startup control method of above-mentioned pump, also comprise: when the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting, control pump exports with the output parameter when front pump, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
First degree of superheat threshold value, the second degree of superheat threshold value rule of thumb set, the first degree of superheat threshold value need be met and be greater than the second degree of superheat threshold value, as the first degree of superheat threshold value can be set as 10 DEG C, second degree of superheat threshold value can be set as 5 DEG C, first degree of superheat threshold value and the second degree of superheat threshold value can be different according to the difference of system, and therefore the present invention is not limited to these concrete numerical value.
As shown in Figure 3, Fig. 3 is the startup control method idiographic flow schematic diagram of pump of the present invention, and the output parameter of employing pump is the output percentage of pump, certainly adopts other parameter also passable, the step-length of setting also converts according to the output percentage of pump, and the startup control method of pump of the present invention comprises:
Step 201, the initial value arranging the output percentage of pump are 10% ~ 50%;
The super heat value of step 202, acquisition current refrigeration system;
Step 203, judge whether the degree of superheat of refrigeration system is greater than the first degree of superheat threshold value of setting;
If so, then step 204 is performed; Otherwise, then step 205 is performed;
The output percentage of step 204, control pump increases the first step-length of setting;
Step 205, judge whether the degree of superheat of system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting;
If so, then step 206 is performed; Otherwise, perform step 207;
Step 206, control pump export with current output percentage;
The output percentage of step 207, control pump reduces the second step-length of setting.
The embodiment of the present invention also provides a kind of startup control system of pump, for in refrigeration system, as shown in Figure 4, Fig. 4 is first embodiment of the invention refrigerant system configurations schematic diagram, described refrigeration system is comprised and to be connected successively by pipeline and to form the condenser 2 of closed cycle, pump 3 and evaporimeter 5, have cold-producing medium in described pipeline, the startup control system of described pump comprises:
Degree of superheat checkout gear 6, is arranged on pipeline that evaporimeter 5 exports between condenser 2 entrance, for detecting the degree of superheat of refrigeration system;
Control device 7, is connected with pump 3 and degree of superheat checkout gear 6 signal respectively, and during for being greater than the first degree of superheat threshold value of setting when the degree of superheat of refrigeration system, the output parameter of control pump increases the first step-length of setting.
In technical solution of the present invention, be described for the refrigeration system shown in Fig. 4, Fig. 4 is for comprising pump 3, the refrigeration system of condenser 2 and evaporimeter 5, the degree of superheat of degree of superheat checkout gear 6 pairs of refrigeration systems is adopted to detect, optimum flow is reached with the flow controlling the refrigeration system when the output parameter of pump gets certain value, when system is by when shutting down opening, the state of pump also becomes unlatching from closedown, output percentage preferably 30% when pump is opened, flow system flow is less, so time system the degree of superheat larger, therefore, need the flow slowly increasing refrigeration system, namely the mode of the output parameter slowly increasing pump is adopted, as adopted the output parameter of output percentage as pump of pump, the output percentage of pump increases the first step-length of a setting at every turn, the span of the first step-length of setting is preferably greater than 0% and is less than 10%, be preferably 1%, the output of pump progressively increases, the flow of refrigeration system also increases gradually, the degree of superheat of refrigeration system will reduce gradually, until the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting.In technical solution of the present invention, the output percentage of pump can increase by 0.1% at every turn, 0.2%, 1%, 3%, 5%, 7% or 10%, more excellent, the output percentage of pump increases by 1% at every turn, described control device both can adopt software simulating controlling functions, also hardware implementing controlling functions can be passed through, when adopting hardware, control device comprises comparator and processor, comparator for compare the refrigeration system degree of superheat respectively with the first degree of superheat threshold value of setting and the magnitude relationship of the second degree of superheat threshold value of setting, and processor is connected with comparator signal, different signal for exporting for comparator carrys out the state of control pump.
Preferably, control device 7, is further used for when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, and the output parameter of control pump reduces the second step-length of setting, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
Preferably, control device 7, be further used for when the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting, control pump exports with the output parameter when front pump, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
Preferably, shown in Fig. 4, described degree of superheat checkout gear 6 comprises:
Temperature sensor 61, is arranged at evaporimeter 5 and exports, for detecting the temperature information of evaporator outlet;
Pressure sensor 62, is arranged at evaporimeter 5 and exports, for detecting the pressure information of evaporator outlet;
Processor 63, is connected with temperature sensor 61 and pressure sensor 62 signal respectively, for calculate detection pressure under the difference of the saturation temperature of cold-producing medium and the temperature of detection, obtain the degree of superheat of refrigeration system.
In technical solution of the present invention, the structure of degree of superheat checkout gear can have multiple, at least comprise a temperature sensor 61, pressure sensor 62 and temperature and pressure is scaled the processor 63 of the degree of superheat, the position of degree of superheat checkout gear 6 preferably can be arranged on the outlet of evaporimeter 5, also can be arranged on evaporimeter 5 exports on the pipeline of condenser 2 entrance, if refrigeration system comprises compressor, degree of superheat checkout gear 6 also can be arranged on the entrance of compressor.
Preferably, described pump 3 is frequency modulation pump or variable pressure pump.
In technical solution of the present invention, the selection mode of pump has multiple, as long as the output parameter of pump 3 is adjustable, preferred employing frequency modulation pump or variable pressure pump, by the rotating speed regulating the frequency of frequency modulation pump to regulate pump, also just have adjusted the output percentage of pump, by the rotating speed regulating the pressure of variable pressure pump to regulate pump, also just have adjusted the output of variable pressure pump.
In the startup control system of the pump stated on the invention, the span that can arrange the initial value of the output percentage of pump is 10% ~ 50%, and preferably, the initial value arranging the output percentage of pump is 30%.Control device is also further used for when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, the output parameter of control pump reduces the second step-length of setting, when the output parameter of described pump is the output percentage of pump, described second degree of superheat threshold value is less than the first degree of superheat threshold value of setting, the second step of described setting is grown up in 0% and is less than 10%, is preferably 1%.
The startup control device of pump of the present invention, in refrigeration system, comprising:
Acquisition equipment, for obtaining the super heat value of refrigeration system;
Control appliance, during for being greater than the first degree of superheat threshold value of setting when the degree of superheat of refrigeration system, the output parameter of control pump increases the first step-length of setting.
In the startup control device of the pump stated on the invention, when the output parameter of pump is the output percentage of pump, the span that can arrange the initial value of the output percentage of pump is 10% ~ 50%, and preferably, the initial value arranging the output percentage of pump is 30%.
Preferably, described control appliance is further used for when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, and the output parameter of control pump reduces the second step-length of setting, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
Preferably, described control appliance is further used for when the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting, control pump exports with the output parameter when front pump, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
Preferably, when the output parameter of described pump is the output percentage of pump, the second step of described setting is grown up in 0% and is less than 10%, and preferably, the second step-length of described setting is 1%.
The startup control system of the pump that the present invention is above-mentioned can be applied to and anyly need in the system of pump, the startup control method of above-mentioned pump can be adopted the adjustment of the output percentage to pump is carried out when pump startup, both reduced the cavitation risk of pump, and made again system reach the state of stable operation quickly.Below enumerate the embodiment be applied in refrigeration system of the startup control system of several concrete pump.
As shown in Figure 5, the refrigerant system configurations schematic diagram of second embodiment of the invention, comprises the startup control system of any one pump above-mentioned, comprises the refrigeration system of the first embodiment, also comprise:
Compressor 1 in described closed cycle and between condenser 2 and evaporimeter 5;
Restricting element 4 in described closed cycle and between pump 3 and evaporimeter 5.
In technical scheme of the present invention, existing pump 3 in refrigeration system, there is again compressor 1, when outdoor temperature is higher, as summer, pump 3 stops, compressor 1 is opened, liquid refrigerant absorbs heat in evaporimeter 5, room air is cooled, cold-producing medium after evaporation is inhaled into compressor 1, do work through compressor 1, become the steam of HTHP, after gaseous refrigerant enters condenser, liquid is become through lowering the temperature with the forced-convection heat transfer of outside air, from condenser 2 flow of refrigerant out after pump 3, now pump 3 does not do work, be only a flow-through element, arrive restricting element 4 again, evaporimeter 5 is entered after restricting element 4 step-down throttling, complete a compression mechanism SAPMAC method, now be in compressor cycle pattern, when outdoor temperature is lower, as winter, compressor 1 stops, and pump 3 is opened, and compressor 1 only as a flow-through element, is now in pump circulation pattern, when outdoor temperature is moderate, as season in spring and autumn, compressor 1 is opened, and pump 3 is opened, and is now in compressor and pump combined-circulation pattern, latter two circulation pattern all make use of outdoor cold source, is beneficial to economize energy.When pump in refrigeration system 3 is opened, the startup control method of pump is all adopted to open, reduce the cavitation of pump, improve the reliability of pump, further, adopt technical solution of the present invention, the pattern of fluid reservoir in prior art can not be adopted, reduce the floor space of pump cabinet largely, reduce the cost of refrigeration system.In technical solution of the present invention, restricting element 4 can adopt electric expansion valve, heating power expansion valve, ball valve, capillary or orifice plate, preferably adopts electric expansion valve, according to load intelligence quick adjustment flow system flow, can save energy consumption.
In inventive refrigeration system second embodiment, a valve member can also be arranged in parallel by the 3rd bypass and restricting element, refrigeration system needs through restricting element when operating in compressor mode, can select through restricting element when the pattern of pump pattern, compressor and pump compound, also can select without restricting element, because valve member resistance is less than restricting element, therefore, the energy consumption of refrigeration system can further be saved like this.And in following 3rd embodiment in the 9th embodiment, also can be arranged in parallel a valve member by the 3rd bypass and restricting element, be beneficial to the energy consumption of saving system.
Preferably, as shown in Figure 6, the refrigerant system configurations schematic diagram of third embodiment of the invention, described refrigeration system, comprises the refrigeration system of the second embodiment, also comprises:
Fluid reservoir 10 in described closed cycle and between condenser 2 and pump 3.
The present embodiment is on the basis of the second embodiment, add a fluid reservoir 10, be specially and export an increase fluid reservoir 10 between the import of pump 3 at condenser 2, the cold-producing medium on a small quantity not becoming liquid completely through condenser 2 heat exchange can carry out vapor-liquid separation in fluid reservoir 10, liquid refrigerant is because weight distribution is below fluid reservoir 10, make to ensure certain liquid refrigerant all the time in fluid reservoir 10, difference in height between the import of fluid reservoir 10 and pump 3 is that system provides certain pressure reduction, further reduce again pump cavitation possibility, the different operating mode operations etc. of pump and compressor simultaneously can cause the optimal refrigerant charging amount of system different, fluid reservoir 10 can be utilized to ensure, and the coolant quantity in condenser 2 and evaporimeter 5 remains best.For the system of a frame height fluid reservoir in prior art, need the safe operation of high for the fluid reservoir frame of 34L at least 1.5m guarantee pump, and adopt the startup control system of pump of the present invention the capacity of fluid reservoir 10 can be decreased to 10L, and put the safe operation that also can ensure pump to ground, reduce the floor space of pump cabinet significantly, decrease cost.
Preferably, as shown in Figure 7, the refrigerant system configurations schematic diagram of fourth embodiment of the invention, in order to make refrigerant system configurations more clear, Fig. 7 eliminates control device and degree of superheat checkout gear, described refrigeration system, comprise the refrigeration system of the second embodiment, also comprise:
By the flow-regulating components 8 that the first bypass and pump 3 are arranged in parallel.
The present embodiment exports to condenser 2 at pump 3 and exports increase by the first bypass between pump intake on the basis of the second embodiment, first bypass is provided with flow-regulating components 8, adopt such design, on the one hand, pump 3 is exported in the pipeline before refrigerant bypass to pump 3 entrance, the degree of supercooling of pump intake can be increased, prevent the shwoot that SR causes, reduce the possibility of pump cavitation; On the other hand, the effect of regulating system flow can be reached by controlling flow-regulating components 8 in the first bypass, when flow system flow is large, can also by the aperture of augmented flow regulating element 8, export again the pipeline before bypass part of refrigerant to pump 3 entrance from pump 3, reduce flow system flow, thus reach the effect of Flow-rate adjustment, guarantee cooling system amount.
Preferably, as shown in Figure 8, the refrigerant system configurations schematic diagram of fifth embodiment of the invention, in order to make refrigerant system configurations more clear, Fig. 8 eliminates control device and degree of superheat checkout gear, described refrigeration system, comprise the refrigeration system of the 3rd embodiment, also comprise:
By the flow-regulating components 8 that the first bypass and pump 3 are arranged in parallel.
The present embodiment on the basis of the 3rd embodiment the outlet of pump 3 and from condenser 2 to pump 3 entrance pipeline increase by the first bypass, the first bypass is provided with a flow-regulating components 8; Fluid reservoir 10 is that system provides certain pressure reduction with the difference in height of pump 3 entrance, and guarantee that pump 3 entrance cold-producing medium is liquid refrigerant, reduce pump cavitation possibility, when the optimal refrigerant charging amount that pump runs under different operating mode, the operation etc. of compressor causes system is different, the coolant quantity that fluid reservoir 10 can be utilized to ensure in condenser and evaporimeter remains best; Simultaneously the first bypass and on flow-regulating components 8 one aspect can increase pump 3 entrance degree of supercooling, reduce pump cavitation possibility, simultaneously also by controlling the refrigerant flow regulating system flow in the first bypass, thus ensureing refrigerating capacity, increasing the reliability of system.
Preferably, as shown in Figure 9, the refrigerant system configurations schematic diagram of sixth embodiment of the invention, in order to make refrigerant system configurations more clear, Fig. 9 eliminates control device and degree of superheat checkout gear, described refrigeration system, comprise the refrigeration system of the second embodiment, also comprise:
By the traffic organising valve member 9 that the second bypass and pump 3 are arranged in parallel.
The present embodiment increases by the second bypass at pump 3 place on the basis of the second embodiment, second bypass is provided with a flow direction control valve part 9: when system is in compressor cycle pattern, traffic organising valve member 9 in second bypass of pump 3 is opened, namely from condenser 2 refrigerant liquid out without the need to through pump 3, only need can be directly to through the second bypass and reach restricting element 4, reduce the resistance of system cloud gray model during compressor cycle pattern.
Preferably, as shown in Figure 10, the refrigerant system configurations schematic diagram of seventh embodiment of the invention, in order to make refrigerant system configurations more clear, Figure 10 eliminates control device and degree of superheat checkout gear, described refrigeration system, comprise the refrigeration system of the 3rd embodiment, also comprise:
By the traffic organising valve member 9 that the second bypass and pump 3 are arranged in parallel.
The pipeline of the present embodiment on the basis of the 3rd embodiment before condenser 2 exports to pump 3 entrance exports on the pipeline of restricting element 4 front end with pump 3 and increases by the second bypass, the second bypass is provided with one and flows to control valve part 9; Fluid reservoir 10 is that system provides certain pressure reduction with the difference in height of pump 3 entrance, and guarantee that pump 3 entrance cold-producing medium is liquid refrigerant, reduce pump cavitation possibility, when the optimal refrigerant charging amount that pump 3 runs under different operating mode, the operation etc. of compressor causes system is different, fluid reservoir 10 can be utilized to ensure, and the coolant quantity in condenser 2 and evaporimeter 5 remains best; When compressor cycle pattern, traffic organising valve member 9 is opened, from condenser 2 out cold-producing medium after fluid reservoir, directly arrive restricting element 4 by traffic organising valve member 9, reduce SR.
Preferably, as shown in figure 11, the refrigerant system configurations schematic diagram of eighth embodiment of the invention, in order to make refrigerant system configurations more clear, Figure 11 eliminates control device and degree of superheat checkout gear, described refrigeration system, comprise the refrigeration system of the second embodiment, described refrigeration system, also comprises:
By the flow-regulating components 8 that the first bypass and pump 3 are arranged in parallel;
By the traffic organising valve member 9 that the second bypass and pump 3 are arranged in parallel.
The present embodiment on the basis of the second embodiment the outlet of pump 3 and from condenser 2 to pump 3 entrance pipeline increase by the first bypass, first bypass is provided with a flow-regulating components 8, export at condenser 2 and increase by the second bypass between restricting element 4, second bypass is provided with a flow direction control valve part 9: when compressor cycle pattern, traffic organising valve member 9 is opened, pump 3 and flow-regulating components 8 are closed, directly evaporimeter 5 sweat cooling is entered to restricting element 4 through the second bypass from condenser 2 cold-producing medium out, cold-producing medium can not reduce SR by pump and numerous valve member, during pump circulation pattern, pump 3 and flow-regulating components 8 are opened, and traffic organising valve member 9 is closed, and arrive evaporimeter 5, and regulate the flow of pump by flow-regulating components 8 in the first bypass from condenser 2 cold-producing medium out after pump 3 boosts through restricting element 4.
Preferably, as shown in figure 12, the refrigerant system configurations schematic diagram of ninth embodiment of the invention, in order to make refrigerant system configurations more clear, Figure 12 eliminates control device and degree of superheat checkout gear, described refrigeration system, comprise the refrigeration system of the 3rd embodiment, described refrigeration system, also comprises:
By the flow-regulating components 8 that the first bypass and pump 3 are arranged in parallel;
By the traffic organising valve member 9 that the second bypass and pump 3 are arranged in parallel.
The present embodiment on the basis of the 3rd embodiment the outlet of pump 3 and from condenser 2 to pump 3 entrance pipeline increase by the first bypass, first bypass there is a flow-regulating components 8, pipeline before condenser 2 exports to pump 3 entrance exports to restricting element 4 front end with pump 3 and increases by the second bypass, the second bypass has a flow direction control valve part 9; Fluid reservoir 10 is that system provides certain pressure reduction with the difference in height of pump 3 entrance, and guarantee that pump 3 entrance cold-producing medium is liquid refrigerant, reduce pump cavitation possibility, simultaneously when the optimal refrigerant charging amount that pump 3 runs under different operating mode, the operation etc. of compressor causes system is different, fluid reservoir 10 can be utilized to ensure, and the coolant quantity in condenser 2 and evaporimeter 5 remains best; When pump circulation pattern, flow-regulating components 8 and pump 3 are opened, traffic organising valve member 9 is closed, after pump 3 boosts, evaporimeter 5 is arrived through restricting element 4 from condenser 2 cold-producing medium out, flow-regulating components 8 one aspect pump 3 capable of bypass in first bypass simultaneously exports cold-producing medium to import, increase pump 3 entrance cold-producing medium degree of supercooling, reduce pump cavitation possibility, on the other hand also can according to refrigeration demand regulating system flow; When compressor cycle, traffic organising valve member 9 is opened, and pump 3 and flow-regulating components 8 are closed, and directly arrives restricting element 4, reduce the resistance of system from condenser 2 cold-producing medium out after fluid reservoir 10 through traffic organising valve member 9.
Below the startup controlling party ratio juris of bright pump of the present invention in theory.As shown in figure 13, Figure 13 is the pressure-enthalpy chart of pump intake refrigerant condition.Energy-conservation refrigeration system is carried out for employing pump, the safe operation of pump has vital effect, this refrigeration system is with the condenser connected successively by pipeline, the closed cycle that pump and evaporimeter are formed is that example illustrates, theoretically, first from pump intake (condensator outlet) refrigerant condition point, through the heat convection of condenser, cold-producing medium becomes liquid state from gaseous state due to outwardly air release heat, be the state point (A point) of saturated liquid state at this for condensator outlet one, owing to there is certain droop loss from condensator outlet to pump intake, namely pressure is reduced to P1 ' by P1, because the range of temperature that pressure drop causes is very little, therefore the change of temperature is ignored at this, think temperature-resistant, therefore refrigerant condition point becomes A ' point from A, now have some liquid refrigerant and become gaseous state, thus produce the safety of cavitation hazard pump.If but condensate outlet state point is subcooled liquid B point, arrive B ' point after certain droop loss, now cold-producing medium is still liquid, thus can avoid the cavitation of pump.So as can be seen from above analysis, avoid the cavitation of pump, ensure that cold-producing medium be liquid before pump intake, can reduce the Pressure Drop before pump intake on the one hand, another aspect can increase the degree of supercooling of cold-producing medium before pump intake.Because the degree of superheat of degree of supercooling and refrigeration system exists certain conversion relation, technical scheme of the present invention is in order to the more direct and effective safe operation ensureing whole system, regulated the output of pump by the degree of superheat controlling refrigeration system, the output of pump is increased gradually, reduce the cavitation of pump.
As shown in figure 14, Figure 14 is pump performance curve map, can find out and work as NPSHa=NPSHr, pump cavitation; As NPSHa < NPSHr, the serious cavitation of pump; As NPSHa > NPSHr, pump is without cavitation; Wherein, NPSHa is device net positive suction head, also known as available NPSH, NPSHr is necessary NPSH, and pump, in large discharge region, cavitation the most easily occurs as shown in Figure 14, so flow when now reducing pump startup, the pressure drop before pump intake can be reduced, thus reduce the cavitation risk of pump.
Circulating pump based on current technical background utilizes the method for frame height fluid reservoir to reduce the cavitation risk of pump, cost is high and pipeline complicated, and the mode that system of the present invention adopts increase setting step-length in the startup control method of pump slowly to start pump solves the problem of cavitation of pump, method is reliably convenient, and this kind of control method can ensure the safe operation of pump significantly.Compared to other refrigeration system, advantage of the present invention is: on the basis not changing system pipeline and device, the control method slowly started by means of only pump increase setting step-length can reduce the impact of cold-producing medium to pump, solves the problem of cavitation of pump, improves the reliability of pump; Exporting in the start-up course increasing setting step-length at pump adopts the degree of superheat as module, the optimum flow of real-time matching system, make system can be in optimal operational condition faster, simultaneously in the refrigeration system having compressor, by also more directly effectively can ensure the safe operation of compressor to the control of the degree of superheat.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (20)
1. a startup control method for pump, in refrigeration system, is characterized in that, comprising:
Obtain the super heat value of current refrigeration system;
When the degree of superheat of refrigeration system is greater than the first degree of superheat threshold value of setting, the output parameter of control pump increases the first step-length of setting.
2. the startup control method of pump as claimed in claim 1, it is characterized in that, the output parameter of described pump is the output percentage of the flow of pump, pump lift, the rotating speed of pump, the frequency of pump or pump, wherein, the output percentage of described pump is the percentage when the output of front pump and the maximum output of pump.
3. the startup control method of pump as claimed in claim 2, it is characterized in that, when the output parameter of described pump is the output percentage of pump, the first step of described setting is grown up in 0% and is less than 10%.
4. the startup control method of pump as claimed in claim 3, it is characterized in that, the first step-length of described setting is 1%.
5. the startup control method of pump as claimed in claim 3, it is characterized in that, the initial value of the output percentage of described pump is 10% ~ 50%.
6. the control method of pump startup as claimed in claim 3, it is characterized in that, the initial value of the output percentage of described pump is 30%.
7. the startup control method of the pump according to any one of claim 1 ~ 6, it is characterized in that, also comprise: when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, the output parameter of control pump reduces the second step-length of setting, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
8. the startup control method of pump as claimed in claim 7, it is characterized in that, when the output parameter of described pump is the output percentage of pump, the second step of described setting is grown up in 0% and is less than 10%.
9. the startup control method of pump as claimed in claim 7, it is characterized in that, also comprise: when the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting, control pump exports with the output parameter when front pump, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
10. the startup control system of a pump, for in refrigeration system, it is characterized in that, described refrigeration system is comprised and to be connected successively by pipeline and to form the condenser (2) of closed cycle, pump (3) and evaporimeter (5), have cold-producing medium in described pipeline, the startup control system of described pump comprises:
Degree of superheat checkout gear (6), is arranged on the pipeline between evaporimeter (5) outlet and condenser (2) entrance, for detecting the degree of superheat of refrigeration system;
Control device (7), is connected with described pump (3) and degree of superheat checkout gear (6) signal respectively, and during for being greater than the first degree of superheat threshold value of setting when the degree of superheat of refrigeration system, the output parameter of control pump increases the first step-length of setting.
The startup control system of 11. pumps as claimed in claim 10, is characterized in that, described degree of superheat checkout gear (6) comprising:
Temperature sensor (61), is arranged at evaporimeter (5) outlet, for detecting the temperature information of evaporator outlet;
Pressure sensor (62), is arranged at evaporimeter (5) outlet, for detecting the pressure information of evaporator outlet;
Processor (63), is connected with described temperature sensor (61) and pressure sensor (62) signal respectively, for calculate detection pressure under the difference of the saturation temperature of cold-producing medium and the temperature of detection, obtain the degree of superheat of refrigeration system.
The startup control system of 12. pumps as described in claim 10 or 11, it is characterized in that, described pump is frequency modulation pump or variable pressure pump.
The startup control device of 13. 1 kinds of pumps, in refrigeration system, is characterized in that, comprising:
Acquisition equipment, for obtaining the super heat value of refrigeration system;
Control appliance, during for being greater than the first degree of superheat threshold value of setting when the degree of superheat of refrigeration system, the output parameter of control pump increases the first step-length of setting.
The startup control device of 14. pumps as claimed in claim 13, it is characterized in that, described control appliance is further used for when the degree of superheat of refrigeration system is less than the second degree of superheat threshold value of setting, the output parameter of control pump reduces the second step-length of setting, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
The startup control device of 15. pumps as claimed in claim 14, it is characterized in that, described control appliance is further used for when the degree of superheat of refrigeration system is not more than the first degree of superheat threshold value of setting and is not less than the second degree of superheat threshold value of setting, control pump exports with the output parameter when front pump, and the second degree of superheat threshold value of described setting is less than the first degree of superheat threshold value of setting.
16. 1 kinds of refrigeration systems, is characterized in that, comprise the startup control system of the pump as described in any one of claim 10 ~ 12, also comprise:
Be arranged in described closed cycle and be positioned at the compressor (1) between described condenser (2) and evaporimeter (5);
Be arranged in described closed cycle and be positioned at the restricting element (4) between described pump (3) and evaporimeter (5).
17. refrigeration systems as claimed in claim 16, is characterized in that, also comprise: be arranged in described closed cycle and be positioned at the fluid reservoir (10) between described condenser (2) and pump (3).
18. refrigeration systems as described in claim 16 or 17, be is characterized in that, also comprise: the flow-regulating components (8) be arranged in parallel by the first bypass and described pump (3).
19. refrigeration systems as described in claim 16 or 17, be is characterized in that, also comprise: the traffic organising valve member (9) be arranged in parallel by the second bypass and described pump (3).
20. refrigeration systems as described in claim 16 or 17, be is characterized in that, also comprise: the flow-regulating components (8) be arranged in parallel by the first bypass and described pump (3);
By the traffic organising valve member (9) that the second bypass and described pump (3) are arranged in parallel.
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