CN114251884A - Temperature control device and method and heat exchange unit - Google Patents
Temperature control device and method and heat exchange unit Download PDFInfo
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- CN114251884A CN114251884A CN202111526282.5A CN202111526282A CN114251884A CN 114251884 A CN114251884 A CN 114251884A CN 202111526282 A CN202111526282 A CN 202111526282A CN 114251884 A CN114251884 A CN 114251884A
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- 238000001816 cooling Methods 0.000 claims abstract description 70
- 230000005494 condensation Effects 0.000 claims abstract description 65
- 238000009833 condensation Methods 0.000 claims abstract description 65
- 239000003507 refrigerant Substances 0.000 claims abstract description 23
- 238000004590 computer program Methods 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 2
- 230000001965 increasing effect Effects 0.000 abstract description 47
- 238000012546 transfer Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
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- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a temperature control device and method and a heat exchanger unit. Wherein, this temperature control device includes: the pre-cooling coil is arranged at the air inlet of the condenser, is communicated with the outlet end of the condensing coil and is used for leading out a refrigerant discharged by the condensing coil to pre-cool air entering the air inlet of the condenser; the electronic expansion valve is arranged on a pipeline between the outlet end of the condensing coil and the pre-cooling coil and is used for throttling the refrigerant discharged by the condensing coil; and the controller is used for controlling the opening and closing state of the electronic expansion valve according to the condensation temperature of the condensation coil and the motor temperature of the fan so as to control whether the precooling coil starts a precooling function or not. According to the invention, the condition that the motor overflows due to the fact that the heat exchange quantity is increased by increasing the rotating speed of the fan can be avoided, and the reliability of the fan is improved.
Description
Technical Field
The invention relates to the technical field of units, in particular to a temperature control device and method and a heat exchanger unit.
Background
In the existing condensation temperature control scheme, when the condensation temperature is higher, the controller increases the motor current of the fan and further increases the motor rotating speed by adjusting the frequency converter, so that the motor drives the fan blades to rotate with higher speed, the air quantity passing through the condenser is increased, more heat is taken away by enhancing convection heat transfer, and the condensation temperature is reduced or kept constant. This kind of control mode is when the motor does not have overcurrent protection device, and is longer when air-cooled condenser live time, and fin and pipeline have the dirt, perhaps when the extreme high temperature weather condition appears in the environment that the machine is located, the fan needs great amount of wind in order to satisfy the heat transfer volume demand, and the electric current of motor also need increase great range this moment, and motor temperature also can rise, leads to the motor to appear overflowing the condition of burning out easily, finally leads to the too high whole refrigerating system of messenger of condensing temperature to shut down.
Aiming at the problem that the motor is easy to be burnt out due to overcurrent when the fan rotating speed is increased by too much when the heat exchange quantity demand is large in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a temperature control device, a temperature control method and a heat exchange unit, and aims to solve the problem that in the prior art, when the heat exchange quantity is required to be large, the rotating speed of a fan is increased to an excessive extent, and a motor is easy to burn due to overcurrent.
In order to solve the technical problem, the invention provides a temperature control device, which is applied to a heat exchange unit with a condenser, wherein the condenser comprises a fan and a condensing coil, and the temperature control device comprises:
the pre-cooling coil is arranged at the air inlet of the condenser, is communicated with the outlet end of the condensing coil and is used for leading out a refrigerant discharged by the condensing coil to pre-cool air entering the air inlet;
the electronic expansion valve is arranged on a pipeline between the outlet end of the condensing coil and the pre-cooling coil and is used for throttling the refrigerant discharged by the condensing coil;
and the controller is used for controlling the opening and closing state of the electronic expansion valve according to the condensation temperature of the condensation coil and the motor temperature of the fan, and further controlling whether the precooling coil starts a precooling function or not.
Further, the apparatus further comprises:
the first temperature sensor is arranged on the condensing coil, is connected with the controller and is used for detecting the condensing temperature and transmitting the condensing temperature to the controller;
and the second temperature sensor is arranged on the motor of the fan, connected with the controller and used for detecting the temperature of the motor and transmitting the temperature to the controller.
Further, the controller is specifically configured to: acquiring the condensation temperature and the motor temperature; when the condensation temperature is higher than a first threshold value and the motor temperature is higher than a second threshold value, controlling the electronic expansion valve to be opened, and further controlling the pre-cooling coil to start a pre-cooling function; and when the condensation temperature is lower than or equal to a first threshold value or the motor temperature is lower than or equal to a second threshold value, controlling the electronic expansion valve to be closed, and further controlling the pre-cooling coil to be closed to achieve the pre-cooling function.
Further, the apparatus further comprises:
the third temperature sensor is arranged at the air inlet of the condenser, is used for detecting the air inlet temperature of the condenser and transmits the air inlet temperature to the controller;
the controller is further configured to: and controlling the electronic expansion valve to be opened and closed according to the inlet air temperature so as to control whether the precooling coil starts a precooling function.
Further, the controller is further specifically configured to:
acquiring the temperature of the inlet air;
when the temperature of the inlet air is higher than a third threshold value, controlling the electronic expansion valve to be opened, and further controlling the precooling coil to start a precooling function;
and when the inlet air temperature is lower than or equal to the third threshold value, triggering to control the opening and closing state of the electronic expansion valve according to the motor temperature of the fan and the condensation temperature of the condensation coil, and further controlling whether the pre-cooling coil starts a pre-cooling function.
Further, still include the converter in the condenser, the controller is still used for:
and when the condensation temperature is higher than a first threshold value, controlling the current output by the frequency converter to increase so as to increase the motor speed of the fan.
The invention also provides a heat exchange unit, which comprises a condenser and the temperature control device.
Further, the heat exchanger unit is a screw type refrigerating unit.
The invention also provides a temperature control method, which is applied to a condenser, wherein the condenser comprises a fan and a condensing coil, and the method comprises the following steps:
acquiring the condensation temperature of the condensation coil and the motor temperature of the fan;
controlling the opening and closing state of the electronic expansion valve according to the condensation temperature and the motor temperature so as to control whether the pre-cooling coil starts a pre-cooling function or not;
the electronic expansion valve is arranged on a pipeline between the outlet end of the condensing coil and the pre-cooling coil.
Further, according to the condensing temperature and the motor temperature, the opening and closing state of the electronic expansion valve is controlled, and then whether the precooling function is started by the precooling coil is controlled, including:
if the condensation temperature is higher than a first threshold value and the motor temperature is higher than a second threshold value, controlling the electronic expansion valve to be opened, and further controlling the pre-cooling coil to start a pre-cooling function;
and if the condensation temperature is lower than or equal to a first threshold value, or the temperature of the motor is lower than or equal to a second threshold value, controlling the electronic expansion valve to be closed, and further controlling the pre-cooling coil to close the pre-cooling function.
Further, the method further comprises:
acquiring the temperature of the inlet air;
if the inlet air temperature is higher than a third threshold value, controlling the electronic expansion valve to be opened, and further controlling the precooling coil to start a precooling function;
and if the inlet air temperature is lower than or equal to the third threshold value, triggering to control the opening and closing state of the electronic expansion valve according to the condensation temperature and the motor temperature, and further controlling whether the pre-cooling coil starts a pre-cooling function.
Further, according to the condensing temperature and the opening and closing state of the electronic expansion valve is controlled by the motor temperature, and then whether the precooling function is started by the precooling coil is controlled, the method further comprises the following steps:
and if the condensation temperature is higher than a first threshold value and the motor temperature is lower than or equal to a second threshold value, controlling the current output by a frequency converter in the condenser to increase so as to increase the motor speed of the fan.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described temperature control method.
By applying the technical scheme of the invention, the refrigerant discharged by the condensing coil is led out through the pre-cooling coil arranged at the air inlet of the condenser, the electronic expansion valve is arranged between the pre-cooling coil and the outlet end of the condensing coil to throttle the refrigerant discharged by the condensing coil, and the throttled refrigerant flows into the pre-cooling coil, can be evaporated and absorb heat in the pre-cooling coil, so that the air entering the air inlet of the condenser is pre-cooled, and the condensing temperature of the condensing coil is conveniently reduced. Through the scheme, the requirement on the heat exchange quantity can be large, when the rotating speed of the fan is increased too much, the air entering the air inlet of the condenser is precooled through the precooling coil pipe, so that the condensation temperature is reduced, the heat exchange quantity is increased, the heat exchange quantity is prevented from being increased through the mode of increasing the rotating speed of the fan, the overcurrent condition of the motor is caused, and the reliability of the fan is improved.
Drawings
FIG. 1 is a block diagram of a temperature control apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of another temperature control apparatus according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of temperature control according to an embodiment of the present invention;
fig. 4 is a flow chart of another temperature control method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the temperature sensors in embodiments of the present invention, the temperature sensors should not be limited to these terms. These terms are only used to distinguish between different temperature sensors. For example, a first temperature sensor may also be referred to as a second temperature sensor, and similarly, a second temperature sensor may also be referred to as a first temperature sensor, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a temperature control device, which is applied to a heat exchanger unit having a condenser, where the condenser includes a condensing coil 2 and a fan 1, an inlet end of the condensing coil 2 is communicated with an exhaust end of a compressor, and an outlet end is communicated with an evaporator, fig. 1 is a structural diagram of a temperature control device according to an embodiment of the present invention, and as shown in fig. 1, the temperature control device includes:
the pre-cooling coil 3 is arranged at the air inlet of the condenser, is communicated with the outlet end of the condensing coil 2, and is used for leading out a refrigerant discharged by the condensing coil 2 and pre-cooling air entering the air inlet through the refrigerant discharged by the condensing coil 2; the pre-cooling coil 3 discharges the refrigerant to flow to the air supplement port of the compressor.
The electronic expansion valve 4 is arranged on a pipeline between the outlet end of the condensing coil 2 and the pre-cooling coil 3 and is used for throttling the refrigerant discharged by the condensing coil 2; the throttled refrigerant flows into the pre-cooling coil 3, can be evaporated and absorb heat in the pre-cooling coil 3, and further pre-cools air entering an air inlet of the condenser, so that the condensing temperature of the condensing coil is reduced, and the requirement of heat exchange quantity is met.
And the controller 5 is connected with the electronic expansion valve 4 and used for controlling the opening and closing state of the electronic expansion valve 4 according to the condensation temperature of the condensation coil 2 and the motor temperature of the fan 1 so as to control whether the precooling function of the precooling coil 3 is started or not.
The temperature control device of this embodiment draws forth the discharged refrigerant of condensing coil through the precooling coil who sets up at the air intake of condenser, set up electronic expansion valve between precooling coil and condensing coil's exit end, throttle the discharged refrigerant of condensing coil, the refrigerant after the throttle flows into precooling coil, can evaporate the heat absorption in precooling coil, and then carries out the precooling to the air that gets into the air intake of condenser, so that reduce condensing coil's condensing temperature. Through the scheme, the requirement on the heat exchange quantity can be large, when the rotating speed of the fan is increased too much, the air entering the air inlet of the condenser is precooled through the precooling coil pipe, so that the condensation temperature is reduced, the heat exchange quantity is increased, the heat exchange quantity is prevented from being increased through the mode of increasing the rotating speed of the fan, the overcurrent condition of the motor is caused, and the reliability of the fan is improved.
Example 2
This embodiment provides another temperature control apparatus, and fig. 2 is a structural diagram of another temperature control apparatus according to an embodiment of the present invention, as shown in fig. 2, the temperature control apparatus further includes:
the first temperature sensor 6 is arranged on the condensing coil 2, is connected with the controller 5, and is used for detecting the condensing temperature and transmitting the condensing temperature to the controller 5; and the second temperature sensor 7 is arranged on the motor inside the fan 1, is connected with the controller 5, is used for detecting the temperature of the motor and transmits the temperature to the controller 5.
The controller 5 is specifically configured to: acquiring the condensation temperature of the condensation coil 2 and the motor temperature of the fan 1; when the condensation temperature is higher than a first threshold value and the motor temperature is higher than a second threshold value, controlling the electronic expansion valve 4 to be opened, and further controlling the pre-cooling coil 3 to start a pre-cooling function; and when the condensation temperature is lower than or equal to a first threshold value or the motor temperature is lower than or equal to a second threshold value, the electronic expansion valve 4 is controlled to be closed, and then the pre-cooling coil 3 is controlled to close the pre-cooling function.
Because the current injected into the motor needs to be increased when the rotating speed of the motor is increased, and the temperature of the motor is increased due to larger current, if the condensation temperature is higher than a first threshold value and the temperature of the motor is higher than a second threshold value, the heat exchange quantity needs to be further increased, but at the moment, the temperature of the motor is already high, and the heat exchange quantity cannot be increased by increasing the current of the motor and further increasing the rotating speed of the motor, so that the precooling function is controlled to be started by controlling the electronic expansion valve 4 to be opened, and the heat exchange quantity is increased; if the condensation temperature is lower than or equal to the first threshold value, it indicates that the heat exchange amount does not need to be continuously increased, and if the motor temperature is lower than or equal to the second threshold value, it indicates that the heat exchange amount can also be increased by increasing the rotation speed of the motor, in both cases, the electronic expansion valve 4 does not need to be opened, i.e., the pre-cooling coil 3 does not need to be opened for the pre-cooling function.
Under the too high condition of outdoor ambient temperature, the air temperature that gets into the air intake of condenser is higher, in order to guarantee the heat transfer effect, also can carry out the precooling to the air that gets into the air intake of condenser, consequently, above-mentioned temperature control device still includes: the third temperature sensor 8 is arranged at the air inlet of the condenser and used for detecting the air inlet temperature of the condenser and transmitting the air inlet temperature to the controller 5; the controller 5 is also configured to: and controlling the electronic expansion valve 4 to be opened and closed according to the inlet air temperature, and further controlling the precooling coil 3 to start a precooling function. The controller 5 is specifically configured to: acquiring the inlet air temperature of a condenser; when the temperature of the inlet air is higher than a third threshold value, controlling the electronic expansion valve 4 to be opened, and further controlling the precooling coil 3 to start a precooling function; when the temperature of the inlet air is lower than or equal to the third threshold value, the opening and closing state of the electronic expansion valve 4 is controlled according to the temperature of the motor of the fan and the condensation temperature of the condensation coil 2, and then whether the precooling function of the precooling coil 3 is started is controlled.
It should be noted that fig. 2 is not intended to show the connection relationship between the first temperature sensor 6, the second temperature sensor 7, and the third temperature sensor 8 and the controller 5 (the connection relationship may be wired or wireless), but is not intended to show the actual installation positions of the first temperature sensor 6, the second temperature sensor 7, and the third temperature sensor 8.
At condensing temperature too high, but when motor speed was lower, also can adjust converter 9 through controller 5, increase motor current to increase motor speed, make the motor drive the fan blade and increase the amount of wind through the condenser, strengthen the heat convection and take away more heat, make the condenser temperature descend, thereby improve the heat transfer volume, consequently, controller 5 still is used for: when the condensation temperature is higher than the first threshold value and the motor temperature is lower than or equal to the second threshold value, the current output by the frequency converter 9 is controlled to be increased, and the motor speed of the fan 1 is further increased. When the rotating speed of the motor of the fan is increased to a certain degree, and the temperature of the motor is higher than a second threshold value, the electronic expansion valve 4 is opened, and whether the precooling function is started by the precooling coil 3 is controlled.
In order to supply power to the controller 5, the first temperature sensor 6, the second temperature sensor 7, the third temperature sensor 8 and the frequency converter 9, the temperature control device further comprises: and the output end of the power supply 10 is connected with the controller 5, the first temperature sensor 6, the second temperature sensor 7, the third temperature sensor 8 and the frequency converter 9.
Example 3
This embodiment provides a heat exchange unit, including the condenser, including fan and condenser coil in the condenser, still include the temperature control device in the above-mentioned embodiment for improve the reliability of fan, and then improve whole heat exchange unit's operational reliability, in this embodiment, heat exchange unit is screw refrigerating unit, wherein includes screw compressor.
Example 4
The present embodiment provides a temperature control method applied to a condenser, as shown in fig. 2 mentioned above, the condenser includes a fan 1 and a condensing coil 2, fig. 3 is a flow chart of a temperature control method according to an embodiment of the present invention, as shown in fig. 3, the method includes:
s101, acquiring the condensation temperature of a condensation coil and the motor temperature of a fan.
And S102, controlling the opening and closing state of the electronic expansion valve according to the condensation temperature and the motor temperature, and further controlling whether the pre-cooling coil starts a pre-cooling function.
The pre-cooling coil is arranged at the air inlet of the condenser, is communicated with the outlet end of the condensing coil and is used for leading out a refrigerant discharged by the condensing coil, and pre-cooling air entering the air inlet through the refrigerant discharged by the condensing coil; the electronic expansion valve is arranged on a pipeline between the outlet end of the condensing coil and the pre-cooling coil and is used for throttling the refrigerant discharged by the condensing coil; the throttled refrigerant flows into the pre-cooling coil pipe, can be evaporated in the pre-cooling coil pipe to absorb heat, and then pre-cools air entering an air inlet of the condenser, so that the condensing temperature of the condensing coil pipe is reduced, and the requirement of heat exchange quantity is met.
The temperature control method of the embodiment controls the opening and closing state of the electronic expansion valve according to the condensing temperature and the motor temperature, and then controls whether the pre-cooling coil pipe starts the pre-cooling function, so that the requirement on the heat exchange quantity is large, when the fan rotating speed is increased too much, air entering an air inlet of a condenser is pre-cooled through the pre-cooling coil pipe, the condensing temperature is reduced, the heat exchange quantity is increased, the heat exchange quantity is prevented from being increased through the mode of increasing the fan rotating speed, the condition of overcurrent of a motor is caused, and the reliability of the fan is improved.
Example 5
In this embodiment, another temperature control method is provided, where increasing the rotation speed of the motor requires increasing the current injected into the motor, and a larger current will cause the temperature of the motor to rise, so as to avoid the motor being burnt due to an excessively high temperature, where the step S102 specifically includes: if the condensation temperature is higher than the first threshold value and the motor temperature is higher than the second threshold value, the heat exchange amount needs to be further increased, but the motor temperature is higher at the moment, and the heat exchange amount cannot be increased by increasing the current of the motor and further increasing the rotating speed of the motor, the electronic expansion valve is controlled to be opened, and the precooling coil is controlled to start the precooling function; if the condensation temperature is lower than or equal to the first threshold value, or the motor temperature is lower than or equal to the second threshold value, it indicates that the heat exchange amount does not need to be continuously increased, or the heat exchange amount can be increased by increasing the rotating speed of the motor, the electronic expansion valve is controlled to be closed, and then the precooling coil is controlled to close the precooling function.
Under the condition that the outdoor environment temperature is too high, the temperature of air entering the air inlet of the condenser is higher, and in order to ensure the heat exchange effect, the air entering the air inlet of the condenser can be precooled, so that the method further comprises the following steps: acquiring the temperature of inlet air; if the inlet air temperature is higher than a third threshold value, controlling the electronic expansion valve to be opened, and further controlling the precooling coil to start a precooling function; if the temperature of the inlet air is lower than or equal to the third threshold value, the opening and closing state of the electronic expansion valve is triggered to be controlled according to the condensation temperature and the motor temperature, and then whether the precooling function of the precooling coil is started or not is controlled.
At condensing temperature too high, but when motor speed was lower, also can adjust the converter through the controller, increased motor current to increase motor speed, make the motor drive the fan blade and increase the amount of wind through the condenser, strengthen the heat convection and take away more heat, make the condenser temperature descend, thereby improve the heat transfer volume, consequently, the method still includes: and if the condensation temperature is higher than the first threshold value and the motor temperature is lower than or equal to the second threshold value, controlling the current output by the frequency converter in the condenser to increase so as to increase the motor speed of the fan. And when the rotating speed of the motor of the fan is increased to a certain degree, and the temperature of the motor is higher than a second threshold value, the electronic expansion valve is opened, and whether the precooling function of the precooling coil is started or not is controlled.
The invention is described in detail below with reference to a specific example. Fig. 4 is a flowchart of another temperature control method according to an embodiment of the present invention, as shown in fig. 4, the method includes:
and S1, acquiring the condensation temperature Tk, the motor temperature Td and the air inlet temperature T.
In specific implementation, the condensation temperature is detected by a first temperature sensor arranged on the condensation coil and is transmitted to a controller; the second temperature sensor is arranged on the motor inside the fan and used for detecting the temperature of the motor and transmitting the temperature to the controller; the air inlet temperature of the condenser is detected by a third temperature sensor arranged at the air inlet of the condenser and is transmitted to the controller.
And S2, judging whether the condensation temperature Tk is higher than the first threshold value and the motor temperature Td is lower than or equal to the second threshold value, if so, executing the step S3, and if not, executing the step S4.
And S3, controlling the current output by the frequency converter in the condenser to increase, and further increasing the motor speed of the fan.
And S4, judging whether the condensation temperature Tk is higher than the first threshold value and the motor temperature Td is higher than the second threshold value, if not, executing the step S6, and if so, executing the step S5.
And S5, controlling the electronic expansion valve to be opened, and further controlling the pre-cooling coil to start a pre-cooling function.
S6, judging whether the intake air temperature T is larger than the third threshold value, if yes, executing step S5, if no, executing step S7 and returning to step S1.
The air inlet temperature variable is added on the basis of the existing temperature control scheme, the cooling coil is additionally arranged at the air inlet of the condenser, the controller of the condenser receives the condensation temperature, the air inlet temperature and the motor temperature at the same time, and different control strategies are executed according to the three temperature parameters.
When the load of the condenser is small and the condensing temperature does not reach the set starting temperature, controlling a motor of the fan to stop and not electrify; when the condensation temperature is lower than a first threshold value and is kept constant, controlling a motor of the fan to keep constant rotating speed; when the load of the condenser is gradually increased, the condensing temperature reaches a first threshold value and is gradually increased, and the temperature of the motor does not reach a temperature sensing protection threshold value, namely the second threshold value, the current of the motor is controlled to be continuously increased to obtain a larger rotating speed, so that the air volume is increased to strengthen heat exchange; however, when extreme high temperature weather occurs or dirt on the condenser affects heat exchange, the condensation temperature can also gradually rise, at the moment, the temperature adjustment of the air inlet precooling coil pipe plays a key role, when the controller is connected with the motor temperature or the air inlet temperature is greater than a set protection temperature value, the controller controls the fan frequency converter to enable the motor current to be kept in the maximum bearing range to operate, meanwhile, the controller controls the electronic expansion valve to be opened, a part of refrigerant of the condensation coil pipe is led out, the refrigerant is throttled by the electronic expansion valve and then evaporated and absorbed in the cooling coil pipe to cool the outside air entering the condenser, so that the motor of the condenser can be protected, the condensation temperature of the whole system can also be kept constant, and the refrigeration effect of the whole system is further ensured. The method can reduce the probability of burning down of the motor in the fan due to high-temperature overcurrent, can also expand the application range of the whole condenser, and reduces the early-stage design and later-stage maintenance cost.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the temperature control method of the above-described embodiment.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. The utility model provides a temperature control device is applied to the heat exchanger unit who possesses the condenser, the condenser includes fan and condensing coil, its characterized in that, the device includes:
the pre-cooling coil is arranged at the air inlet of the condenser, is communicated with the outlet end of the condensing coil and is used for leading out a refrigerant discharged by the condensing coil to pre-cool air entering the air inlet;
the electronic expansion valve is arranged on a pipeline between the outlet end of the condensing coil and the pre-cooling coil and is used for throttling the refrigerant discharged by the condensing coil;
and the controller is used for controlling the opening and closing state of the electronic expansion valve according to the condensation temperature of the condensation coil and the motor temperature of the fan, and further controlling whether the precooling coil starts a precooling function or not.
2. The apparatus of claim 1, further comprising:
the first temperature sensor is arranged on the condensing coil, is connected with the controller and is used for detecting the condensing temperature and transmitting the condensing temperature to the controller;
and the second temperature sensor is arranged on the motor of the fan, connected with the controller and used for detecting the temperature of the motor and transmitting the temperature to the controller.
3. The apparatus of claim 1,
the controller is specifically configured to: acquiring the condensation temperature and the motor temperature; when the condensation temperature is higher than a first threshold value and the motor temperature is higher than a second threshold value, controlling the electronic expansion valve to be opened, and further controlling the pre-cooling coil to start a pre-cooling function; and when the condensation temperature is lower than or equal to a first threshold value or the motor temperature is lower than or equal to a second threshold value, controlling the electronic expansion valve to be closed, and further controlling the pre-cooling coil to be closed to achieve the pre-cooling function.
4. The apparatus of claim 1, further comprising:
the third temperature sensor is arranged at the air inlet of the condenser, is used for detecting the air inlet temperature of the condenser and transmits the air inlet temperature to the controller;
the controller is further configured to: and controlling the electronic expansion valve to be opened and closed according to the inlet air temperature so as to control whether the precooling coil starts a precooling function.
5. The apparatus of claim 4, wherein the controller is further specifically configured to:
acquiring the temperature of the inlet air;
when the temperature of the inlet air is higher than a third threshold value, controlling the electronic expansion valve to be opened, and further controlling the precooling coil to start a precooling function;
and when the inlet air temperature is lower than or equal to the third threshold value, triggering to control the opening and closing state of the electronic expansion valve according to the motor temperature of the fan and the condensation temperature of the condensation coil, and further controlling whether the pre-cooling coil starts a pre-cooling function.
6. The apparatus of claim 1, further comprising a frequency converter in the condenser, the controller further configured to:
and when the condensation temperature is higher than a first threshold value and the motor temperature is lower than or equal to a second threshold value, controlling the current output by the frequency converter to increase so as to increase the motor speed of the fan.
7. A heat exchanger unit comprising a condenser and further comprising a temperature control device as claimed in any one of claims 1 to 6.
8. The heat exchanger unit of claim 7, wherein the heat exchanger unit is a screw refrigeration unit.
9. A temperature control method is applied to a condenser, the condenser comprises a fan and a condensing coil, and the method is characterized by comprising the following steps:
acquiring the condensation temperature of the condensation coil and the motor temperature of the fan;
controlling the opening and closing state of the electronic expansion valve according to the condensation temperature and the motor temperature so as to control whether the pre-cooling coil starts a pre-cooling function or not;
the electronic expansion valve is arranged on a pipeline between the outlet end of the condensing coil and the pre-cooling coil.
10. The method of claim 9, wherein controlling an open/close state of the electronic expansion valve according to the condensing temperature and the motor temperature to control whether the pre-cooling coil starts a pre-cooling function comprises:
if the condensation temperature is higher than a first threshold value and the motor temperature is higher than a second threshold value, controlling the electronic expansion valve to be opened, and further controlling the pre-cooling coil to start a pre-cooling function;
and if the condensation temperature is lower than or equal to a first threshold value, or the temperature of the motor is lower than or equal to a second threshold value, controlling the electronic expansion valve to be closed, and further controlling the pre-cooling coil to close the pre-cooling function.
11. The method of claim 9, further comprising:
acquiring the temperature of the inlet air;
if the inlet air temperature is higher than a third threshold value, controlling the electronic expansion valve to be opened, and further controlling the precooling coil to start a precooling function;
and if the inlet air temperature is lower than or equal to the third threshold value, triggering to control the opening and closing state of the electronic expansion valve according to the condensation temperature and the motor temperature, and further controlling whether the pre-cooling coil starts a pre-cooling function.
12. The method of claim 9, wherein controlling an open/close state of the electronic expansion valve according to the condensing temperature and the motor temperature to control whether the pre-cooling coil starts a pre-cooling function further comprises:
and if the condensation temperature is higher than a first threshold value and the motor temperature is lower than or equal to a second threshold value, controlling the current output by a frequency converter in the condenser to increase so as to increase the motor speed of the fan.
13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 9 to 12.
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| CN202111526282.5A CN114251884A (en) | 2021-12-14 | 2021-12-14 | Temperature control device and method and heat exchange unit |
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| CN202111526282.5A CN114251884A (en) | 2021-12-14 | 2021-12-14 | Temperature control device and method and heat exchange unit |
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Cited By (1)
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| CN115789919A (en) * | 2022-12-05 | 2023-03-14 | 珠海格力电器股份有限公司 | Centralized air conditioner and control method and device thereof |
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