CN116489934A - Variable frequency cabinet cooling device, variable frequency cabinet and method for water chilling unit - Google Patents
Variable frequency cabinet cooling device, variable frequency cabinet and method for water chilling unit Download PDFInfo
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- CN116489934A CN116489934A CN202210037221.0A CN202210037221A CN116489934A CN 116489934 A CN116489934 A CN 116489934A CN 202210037221 A CN202210037221 A CN 202210037221A CN 116489934 A CN116489934 A CN 116489934A
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- 238000001816 cooling Methods 0.000 title claims abstract description 124
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000017525 heat dissipation Effects 0.000 claims abstract description 113
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000005494 condensation Effects 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims description 92
- 239000007788 liquid Substances 0.000 claims description 46
- 230000007613 environmental effect Effects 0.000 claims description 13
- 239000013526 supercooled liquid Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000005855 radiation Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20318—Condensers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20327—Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20381—Thermal management, e.g. evaporation control
-
- 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
Abstract
The invention discloses a variable frequency cabinet cooling device, a variable frequency cabinet and a method for a water chilling unit; the condenser comprises two paths of cooling outputs, one path of cooling output is connected to a cooling plate in the frequency conversion cabinet, and the other path of cooling output is connected to a fan coil in the frequency conversion cabinet; at the outlet of the variable frequency cabinet, the heat dissipation plate and the fan coil are connected to the evaporator through an electronic expansion valve and a ball valve in sequence. Collecting the cooling inlet of the cooling plate, the cooling outlet of the cooling plate, the IGBT of the cooling element, the internal temperature of the variable frequency cabinet and the external temperature of the variable frequency cabinet; at the same time, at least one of the cooling plate cooling control mode and the fan coil cooling control mode is used for cooling. The problems of control precision and valve body service life caused by frequent valve movements during low-load operation of the unit can be avoided, and the valve is particularly suitable for cooling of low-voltage frequency conversion cabinets. The risk of condensation of electric elements in the variable frequency cabinet can be reduced, the risk of short circuit of the electric elements is reduced, the heat dissipation plate or IGBT of the unit is prevented from being burnt out due to overhigh temperature, the running range of the unit is increased, and the start and stop times of the unit are reduced.
Description
Technical Field
The invention belongs to the technical field of refrigeration heat exchange, and particularly relates to a variable frequency cabinet cooling device in a refrigeration heat exchange unit, a variable frequency cabinet and a related method.
Background
In the operation process of the existing water chilling unit, the variable frequency cabinet continuously works, internal electric elements continuously emit heat, heat aggregation can be caused, the environment temperature in the heat radiating elements and the cabinet is continuously increased, and when serious, the electric elements are burnt out, so that the unit cannot operate. In order to ensure the normal operation of the frequency conversion cabinet, the cooling plate is required to cool the electric elements in the frequency conversion cabinet, and meanwhile, the fan coil is adopted to cool the air in the cabinet, so that the temperature of the electric elements and the temperature of the environment in the cabinet are maintained in a reasonable range.
At present, the common cooling modes of the frequency conversion cabinet comprise refrigerant cooling, water cooling, air cooling and the like. The air cooling is suitable for a frequency conversion cabinet with small capacity and small heat dissipation; once leakage occurs in a water cooling mode, potential safety hazards can be caused, the process requirements on the water circulation system are high, and the later maintenance workload is large. When the refrigerant is cooled, an electronic expansion valve is added at the inlet of the variable frequency cabinet to throttle, and the low-temperature refrigerant enters the variable frequency cabinet to cool after throttling. However, when the cooling system unit is in low load, the heating value of the electric element is small, the flow of the required coolant liquid is small, the opening of the electronic expansion valve is small, the valve frequently acts, and the control precision and the service life of the electronic expansion valve are affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a variable frequency cabinet cooling device, a variable frequency cabinet and a method for a water chilling unit, which can avoid the problems of control precision and valve body service life caused by frequent valve movements during low-load operation of the unit, and are particularly suitable for cooling a low-voltage variable frequency cabinet.
Furthermore, the invention can reduce the condensation risk of the electric elements in the frequency conversion cabinet, reduce the short circuit risk of the electric elements, prevent the heat dissipation plate or IGBT of the unit from being burnt due to overhigh temperature, increase the running range of the unit and reduce the start and stop times of the unit.
In order to solve the problems, the invention adopts the following technical scheme:
a kind of frequency conversion cupboard cooling device used for water chilling unit, characterized by that: the condenser comprises two paths of cooling outputs, one path of cooling output is connected to a cooling plate in the frequency conversion cabinet, and the other path of cooling output is connected to a fan coil in the frequency conversion cabinet; at the outlet of the variable frequency cabinet, the heat dissipation plate and the fan coil are connected to the evaporator through an electronic expansion valve and a ball valve in sequence.
In the technical scheme, the heat radiation plate is connected into the evaporator through one path of refrigerant pipeline, the fan coil is connected into the evaporator through the other path of refrigerant pipeline, and the electronic expansion valve and the ball valve are respectively and sequentially arranged on the one path of refrigerant pipeline and the other path of refrigerant pipeline along the flowing direction.
According to the technical scheme, the supercooled liquid output by the condenser is divided into two paths of cooling outputs to be connected into the variable frequency cabinet after passing through the ball valve and the filter in sequence, or the supercooled liquid output by the condenser is connected into the variable frequency cabinet through the two paths of cooling outputs, and the ball valve and the filter are arranged on each path of cooling output.
In the above technical scheme, an orifice plate is arranged in the downstream direction of the filter.
In the technical scheme, besides the temperature acquisition point of the IGBT of the radiating element, the radiating plate is provided with two temperature measurement points, one is close to the cooling inlet of the radiating plate, and the other is close to the cooling outlet of the radiating plate; the inside and the outside of the variable frequency cabinet are respectively provided with a temperature acquisition point for acquiring the ambient temperature in the cabinet and the outdoor ambient temperature.
A variable frequency cabinet which is characterized in that: the cooling device of the variable frequency cabinet of the water chilling unit is suitable for cooling the low-voltage variable frequency cabinet with the input power of 500 KW to 1000 KW.
A cooling method of a variable frequency cabinet of a water chilling unit is characterized by comprising the following steps of: collecting the cooling inlet of the cooling plate, the cooling outlet of the cooling plate, the IGBT of the cooling element, the internal temperature of the variable frequency cabinet and the external temperature of the variable frequency cabinet; at least one of a cooling plate cooling control mode and a fan coil cooling control mode is used for cooling;
wherein:
the cooling control mode of the heat dissipation plate comprises the following steps: the refrigerant liquid enters the heat dissipation plate to cool the heating element in the variable frequency cabinet, the refrigerant flowing out of the heat dissipation plate returns to the evaporator through the refrigerant pipeline, the flow of the refrigerant entering the heat dissipation plate is regulated through the electronic expansion valve on the refrigerant pipeline, when the temperature of the heat dissipation plate is higher than the target temperature of the heat dissipation plate, the electronic expansion valve acts, the opening degree is increased, the refrigerant liquid supply amount of the heat dissipation plate is increased, and the temperature of the heat dissipation plate is reduced to the target temperature of the heat dissipation plate; when the temperature of the heat dissipation plate is lower than the target temperature of the heat dissipation plate, the electronic expansion valve acts, the opening degree is reduced, the refrigerant liquid supply amount of the heat dissipation plate is reduced, and the temperature of the heat dissipation plate is increased to the target temperature of the heat dissipation plate;
the fan coil cooling control mode comprises the following steps: the refrigerant liquid enters the fan coil, air in the cabinet is cooled through the fan coil, refrigerant flowing out of the fan coil returns to the evaporator through the other path of refrigerant pipeline, the flow of the refrigerant entering the fan coil is regulated through the electronic expansion valve on the other path of refrigerant pipeline, when the ambient temperature in the cabinet is higher than the target temperature of the fan coil, the electronic expansion valve acts, the opening degree is increased, the refrigerant liquid supply amount of the fan coil is increased, and the ambient temperature in the cabinet is reduced to the target temperature of the fan coil; when the environmental temperature in the cabinet is lower than the target temperature of the fan coil, the electronic expansion valve acts, the opening degree is reduced, the refrigerant liquid supply amount of the fan coil is reduced, and the environmental temperature in the cabinet is improved to the target temperature of the fan coil.
In the above technical scheme, in the cooling control mode of the heat dissipation plate:
when the heat dissipation plate is at high temperature T HP,high -heat sink low temperature T HP,low dT1 is set according to the temperature difference, and the highest temperature T is acquired by the IGBT of the radiating element IGBT,Max For the control object, wherein the IGBT target temperature is set with T IGBT,target The IGBT bias sets dT0 value;
when the heat dissipation plate is at high temperature T HP,high -heat sink low temperature T HP,low＜ When dT2 is set by the temperature difference, the small-load condensation protection logic is exited, and the temperature average value T of the heat dissipation plate is adopted HP,avg As a control object, a target temperature T HP,target Taking (Cabinet external environment temperature T) AT,out +temperature difference setting dT 3) and (liquid supply temperature T) liq The +temperature difference sets the smaller of dT 4);
when the temperature of the heat dissipation plate is average T HP,avg When the temperature is higher than the target temperature of the heat dissipation plate, the electronic expansion valve on the one-path refrigerant pipeline acts, the opening degree is increased, the refrigerant liquid supply amount of the heat dissipation plate is increased, and the temperature average value T of the heat dissipation plate is reduced HP,avg To the target temperature T of the heat dissipation plate HP,target ；
When the temperature of the heat dissipation plate is average T HP,avg Below the target temperature T of the heat dissipation plate HP,target When the electronic expansion valve on the one-path refrigerant pipeline acts, the opening degree is reduced, the refrigerant liquid supply amount of the heat dissipation plate is reduced, and the temperature average value T of the heat dissipation plate is improved HP,avg To the target temperature T of the heat dissipation plate HP,target ；
T HP,avg ＝(T HP,high +T HP,low )/2；
T HP,target ＝Min(T AT,out +temperature difference set point dT3, T liq +temperature difference set point dT 4);
wherein: t (T) HP,avg The temperature average value of the heat dissipation plate is DEG C; t (T) HP,high The temperature is high for the heat dissipation plate; t (T) HP,low The temperature is high for the heat dissipation plate; t (T) HP,target The temperature is the target temperature of the heat dissipation plate; t (T) AT,out The temperature is the external environment temperature of the cabinet and is at the temperature of DEG C; t (T) liq The temperature of liquid supply and the temperature of the liquid supply are controlled; dT0 is a target temperature control deviation set value, DEG C; dTi is the temperature difference set value, DEG C.
In the above technical scheme, in the fan coil cooling control mode: by using the internal environment temperature T of the cabinet AT,in As a control object, a target temperature T FCU,target Taking (Cabinet external environment temperature T) AT,out +temperature difference setting dT 5) and (liquid supply temperature T) liq The +temperature difference sets the smaller of dT 6);
when the environment temperature T in the frequency converter cabinet AT,in Above the target temperature T FCU,target When the electronic expansion valve on the other path of refrigerant pipeline acts, the opening degree is increased, the refrigerant liquid supply amount of the fan coil is increased, and the internal environment temperature T in the cabinet is reduced AT,in To a target temperature T FCU,target The method comprises the steps of carrying out a first treatment on the surface of the When the environment temperature T in the frequency converter cabinet AT,in Below the target temperature T FCU,target When the electronic expansion valve on the other path of refrigerant pipeline acts, the opening degree is reduced, the refrigerant liquid supply amount of the fan coil is reduced, and the environmental temperature T is improved AT,in To a target temperature T FCU,target ；T FCU,target ＝Min(T AT,out +dT5℃，T liq +dT6℃)；
Wherein: t (T) FCU,target Fan coilControlling the target temperature and the temperature.
In the above technical scheme, when the heat dissipation plate is at high temperature T HP,high Or the maximum temperature T of IGBT IGBT,Max When the temperature is more than or equal to T1 and less than T2, the electronic expansion valve on the other path of refrigerant pipeline is forcedly opened, and the unit is forbidden to increase load; when the heat dissipation plate is at high temperature T HP,high Or the maximum temperature T of IGBT IGBT,Max When the temperature is more than or equal to T2, the electronic expansion valve on the one-path refrigerant pipeline is forcedly opened, and the unit is forcedly unloaded; when the heat dissipation plate is at high temperature T HP,high Greater than or equal to T3 or T IGBT,Max When the temperature is greater than or equal to T4, starting a cabinet to alarm at high temperature; when the heat dissipation plate is at low temperature T HP,low Less than or equal to (cabinet internal environment temperature T) AT,in -the temperature difference is set dT 7) and the set time is continued, the low-temperature alarm of the cabinet is started; wherein Ti is a high-temperature protection temperature set value, DEG C, i is 1 to n, and n is a natural number.
The invention adopts triple protection for high temperature protection, i=3, which are respectively forbidden to increase load, force load shedding and alarm stop.
The principle of the invention is as follows:
and an electronic expansion valve on one path of refrigerant pipeline is arranged at a cooling outlet of a cooling plate of the variable frequency cabinet, and the temperature of the cooling plate is controlled by adjusting the flow of the refrigerant after heat exchange. The refrigerant changes phase after heat exchange in the heat dissipation plate, the volume flow is increased, the opening of the valve is increased, and the flow of the refrigerant is convenient to control.
And an electronic expansion valve on the other path of refrigerant pipeline is arranged at a cooling outlet of a fan coil of the variable frequency cabinet, and the temperature in the environment of the refrigerant flow control cabinet is controlled by adjusting heat exchange. The refrigerant changes phase after heat exchange in the fan coil, the volume flow is increased, the opening of the valve is increased, and the refrigerant flow is convenient to control.
And the temperature target of the cooling plate and the temperature target of the fan coil are respectively related to the environment outside the cabinet and the liquid supply temperature, and the temperature target of the cooling plate is higher than the temperature target of the fan coil, so that the condensation risk of electric elements in the variable frequency cabinet is reduced.
The starting cabinet is provided with low-temperature protection. When the temperature of the radiating plate is lower than the temperature in the cabinet by a certain value and the duration exceeds 5 minutes, the low-temperature alarm of the cabinet is started, the condensation in the cabinet is prevented from being started, and the short-circuit risk of the electrical elements is reduced.
The high temperature protection adopts triple protection, namely, load increase inhibition, forced load shedding and alarm shutdown. The logic can prevent the heat dissipation plate or IGBT of the unit from being burnt due to overhigh temperature, increase the running range of the unit and reduce the start and stop times of the unit.
And setting IGBT temperature fluctuation protection. When the temperature difference between the high temperature and the low temperature of the radiating plate is large, the gas at the outlet of the cooling pipeline of the radiating plate is overheated, the cooling effect of the radiating plate is poor, and the IGBT temperature can be high due to long-time operation; when the IGBT temperature is too high, the high-temperature protection of the unit can force the valve to be opened, so that the liquid supply amount of the cooling pipeline of the heat dissipation plate is increased, and the IGBT temperature is rapidly reduced. When the temperature difference between the high temperature and the low temperature of the radiating plate is large, the IGBT temperature is used as a control object, so that the fluctuation of the IGBT temperature can be avoided, the frequent action of the electronic expansion valve is avoided, and the service lives of the IGBT elements and the electronic expansion valve are prolonged.
Compared with the prior art, the invention has the following effects:
(1) The electronic expansion valve is arranged at the outlet of the cooling pipeline, so that the valve is prevented from being too small in opening degree during large temperature difference and low load, and the valve is enabled to act to avoid a section with small opening degree, thereby being convenient to control.
(2) The target temperature of the heat radiation plate is higher than that of the fan coil, and meanwhile, low-temperature protection is arranged, so that the condensation risk of electric elements in the frequency conversion cabinet is reduced.
(3) The high temperature protection adopts triple protection, namely, load increase inhibition, forced load shedding and alarm shutdown. The logic can prevent the heat dissipation plate or IGBT of the unit from being burnt due to overhigh temperature, increase the running range of the unit and reduce the start and stop times of the unit.
(4) The cooling scheme of the variable frequency cabinet is provided with protection logics such as high-temperature protection, low-temperature protection and IGBT temperature fluctuation protection, so that the reliability of operation of the variable frequency cabinet and the unit under various working conditions is improved.
Drawings
The details of the present invention can be found in the following description and the accompanying drawings.
Fig. 1 is a schematic structural diagram of a cooling device of a variable frequency cabinet for a water chiller according to an embodiment of the present invention.
The reference numerals in fig. 1 correspond to the following:
an evaporator 1, a condenser 2, a heat radiation plate 3, a fan coil 4, a ball valve 5, a filter 6, an orifice plate 7 and an electronic expansion valve 8.
FIG. 2 is a control flow chart of a cooling method of the variable frequency cabinet of the water chiller.
Fig. 3 is a schematic structural diagram of a cooling device for a variable frequency cabinet of a water chiller according to yet another embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clearly apparent, the technical schemes of the invention are further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1:
as shown in fig. 1-2, the invention discloses a variable frequency cabinet cooling device for a water chilling unit.
In the scheme shown in fig. 1, supercooled liquid from the bottom of a condenser 2 enters a frequency conversion cabinet in two ways (one way of cooling output and the other way of cooling output) after passing through a ball valve 5 and a filter 6, and the cooling plate 3 and a fan coil 4 in the frequency conversion cabinet are cooled respectively; the refrigerant coming out of the variable frequency cabinet sequentially enters the evaporator 1 through the electronic expansion valve 8 (the electronic expansion valve EXV1 and the electronic expansion valve EXV 2) and the ball valve 5.
In the two cooling outputs, an orifice plate 7 is respectively arranged on one cooling output and the other cooling output.
In the embodiment of the invention, the heat radiation plate 3 enters the evaporator 1 through one path of refrigerant pipeline, and the fan coil 4 enters the evaporator 1 through the other path of refrigerant pipeline. The electronic expansion valves (the electronic expansion valve EXV1 and the electronic expansion valve EXV 2) and the ball valve 5 are respectively and sequentially arranged on the one refrigerant pipeline and the other refrigerant pipeline along the flowing direction.
As shown in fig. 1, the system is provided with ball valves 5 at the front and rear, the ball valves are opened when the system is running, the refrigerant circulation in the system is ensured, and the flow of the refrigerant entering the heat dissipation plate 3 and the fan coil 4 is regulated by adjusting the opening of the electronic expansion valve 8. When the cooling system of the variable frequency cabinet is overhauled, the front ball valve 5 and the rear ball valve 5 of the system can be closed, so that the loss of refrigerant is reduced, and the overhauling is convenient. The filter 6 is arranged on the cooling liquid supply pipeline of the variable frequency cabinet, so that the cleanliness of the refrigerant is improved, impurities are prevented from entering the cooling plate 3 or the throttling orifice 7 to cause the blockage of the inner flow passage or the orifice of the cooling plate, and the local high-temperature risk is reduced.
The heat sink shown in fig. 1 cools: the liquid flowing out after the filter 6 enters the heat dissipation plate 3 to cool the heating element in the frequency conversion cabinet after passing through the orifice plate 7; the refrigerant flowing out of the heat radiation plate 3 returns to the evaporator 1 through the electronic expansion valve EXV1 (the electronic expansion valve 8 on the one-way refrigerant line) and the ball valve 5. The scheme adjusts the flow of the refrigerant entering the heat dissipation plate through the electronic expansion valve 8. The scheme is provided with temperature measuring points inside and outside the heat radiation plate 3, the heat radiation element I GBT and the frequency conversion cabinet, and is used for monitoring the temperature of the heat radiation plate of the frequency conversion cabinet, the environmental temperature in the cabinet and the outdoor environmental temperature in real time. When the temperature of the heat dissipation plate is higher than the target temperature of the heat dissipation plate, the electronic expansion valve EXV1 acts, the opening degree is increased, the refrigerant liquid supply amount of the heat dissipation plate is increased, and the temperature of the heat dissipation plate is reduced to the target temperature of the heat dissipation plate; when the temperature of the heat radiation plate is lower than the target temperature of the heat radiation plate, the electronic expansion valve EXV1 acts, the opening degree is reduced, the refrigerant liquid supply amount of the heat radiation plate is reduced, and the temperature of the heat radiation plate is increased to the target temperature of the heat radiation plate.
The radiator cooling control logic is shown in fig. 2. The heat dissipation plate is provided with two temperature measuring points, one is close to the cooling inlet of the heat dissipation plate, and the other is close to the cooling outlet of the heat dissipation plate. When the heat dissipation plate is at high temperature T HP,high -heat sink low temperature T HP,low dT1 is set according to the temperature difference, and the highest value T of the temperature is acquired by IGBT IGBT,Max For the control object, the target temperature is set to T IGBT,target Deviation setting dT0 value; when the heat dissipation plate is at high temperature T HP,high -heat sink low temperature T HP,low＜ When dT2 is set by the temperature difference, the small-load condensation protection logic is exited, and the temperature average value T of the heat dissipation plate is adopted HP,avg As a control object, a target temperature T HP,target Taking (Cabinet external environment temperature T) AT,out +temperature difference setting dT 3) and (liquid supply temperature T) liq +temperature difference setting dT 4) twoSmaller of those. When the temperature of the heat dissipation plate is average T HP,avg When the temperature is higher than the target temperature of the heat dissipation plate, the electronic expansion valve EXV1 acts, the opening degree is increased, the refrigerant liquid supply amount of the heat dissipation plate is increased, and the temperature average value T of the heat dissipation plate is reduced HP,avg To the target temperature T of the heat dissipation plate HP,target The method comprises the steps of carrying out a first treatment on the surface of the When the temperature of the heat dissipation plate is average T HP,avg Below the target temperature T of the heat dissipation plate HP,target When the electronic expansion valve EXV1 is operated, the opening degree is reduced, the refrigerant liquid supply amount of the heat dissipation plate is reduced, and the temperature average value T of the heat dissipation plate is improved HP,avg To the target temperature T of the heat dissipation plate HP,target 。
T HP,avg ＝(T HP,high +T HP,low )/2；
T HP,target ＝Min(T AT,out +temperature difference set point dT3, T liq +temperature difference set point dT 4);
wherein: t (T) HP,avg Average temperature of the heat dissipation plate, and DEG C; t (T) HP,high The heat dissipation plate is high in temperature and at the temperature of DEG C; t (T) HP,low The heat dissipation plate is high in temperature and at the temperature of DEG C; t (T) HP,target The target temperature of the heat dissipation plate, and the temperature is lower than the target temperature; t (T) AT,out External environment temperature, DEG C, T liq The temperature of liquid supply and the temperature of the liquid supply are controlled; dT0 target temperature control deviation set point, DEG C; dTi temperature difference set value, DEG C.
Fan coil cooling shown in fig. 1: the liquid flowing out after the filter enters the orifice plate, the temperature is reduced after the liquid is throttled by the orifice plate, the liquid temperature is lower than the environmental temperature in the variable frequency cabinet, and the air in the cabinet is cooled through the fan coil. The refrigerant flowing out of the fan coil is returned to the evaporator through the electronic expansion valve EXV2 and the ball valve. According to the scheme, the electronic expansion valve is used for adjusting the flow of the refrigerant entering the fan coil. When the environmental temperature in the cabinet is higher than the target temperature of the fan coil, the electronic expansion valve EXV1 acts, the opening degree is increased, the refrigerant liquid supply amount of the fan coil is increased, and the environmental temperature in the cabinet is reduced to the target temperature of the fan coil; when the environmental temperature in the cabinet is lower than the target temperature of the fan coil, the electronic expansion valve EXV1 acts, the opening degree is reduced, the refrigerant liquid supply amount of the fan coil is reduced, and the environmental temperature in the cabinet is improved to the target temperature of the fan coil.
Fan coil cooling control logic is shown in fig. 2, employingAmbient temperature T in cabinet AT,in As a control object, a target temperature T FCU,target Taking (Cabinet external environment temperature T) AT,out +temperature difference setting dT 5) and (liquid supply temperature T) liq The + temperature difference sets the smaller of dT 6). When the environment temperature T in the frequency converter cabinet AT,in Above the target temperature T FCU,target During the operation of the electronic expansion valve EXV2, the opening degree is increased, the refrigerant liquid supply amount of the fan coil is increased, and the internal environment temperature T in the cabinet is reduced AT,in To a target temperature T FCU,target The method comprises the steps of carrying out a first treatment on the surface of the When the environment temperature T in the frequency converter cabinet AT,in Below the target temperature T FCU,target In this case, the electronic expansion valve EXV2 (the electronic expansion valve 8 on the other refrigerant line) is actuated to reduce the opening, reduce the refrigerant supply amount of the fan coil, and increase the ambient temperature T AT,in To a target temperature T FCU,target 。
T FCU,target ＝Min(T AT,out +dT5℃，T liq +dT6℃)；
Wherein: t (T) FCU,target The fan coil controls the target temperature, DEG C.
Setting the Ti high-temperature protection temperature set value and the temperature in DEG C. The logic for high temperature protection of the frequency converter is shown in fig. 2. When (radiating plate high temperature T) HP,high Or the maximum temperature T of IGBT IGBT,Max ) When the load is greater than or equal to T1 and less than T2, the electronic expansion valve EXV is forcedly opened, and the unit is prohibited from increasing load; when (radiating plate high temperature T) HP,high Or the maximum temperature T of IGBT IGBT,Max ) When the pressure is more than or equal to T2, the electronic expansion valve EXV is forcedly opened, and the unit is forcedly unloaded; when the heat dissipation plate is at high temperature T HP,high Greater than or equal to T3 or T IGBT,Max When the temperature is greater than or equal to T4, starting a cabinet to alarm at high temperature; when the heat dissipation plate is at low temperature T HP,low Less than or equal to (cabinet internal environment temperature T) AT,in -the temperature difference is set dT 7) and lasts for 5min, the low-temperature alarm of the cabinet is started.
The device and the method are particularly suitable for cooling the low-voltage variable-frequency cabinet with the input power of 500 KW to 1000 KW.
Example 2:
fig. 3 is a two-in two-out variable frequency cabinet cooling device for a water chiller according to yet another embodiment of the present invention. Unlike example 1, the two paths of the invention entering the variable frequency cabinet are branched from the condenser, and independent ball valves and filters are arranged on each path. Therefore, each path can be controlled respectively, and the control is more flexible and refined.
The scheme adopts the scheme that supercooled liquid coming out from the bottom of a condenser 2 enters a variable frequency cabinet through two paths of ball valves 5 and a filter 6 (one path of cooling output and the other path of cooling output, wherein each path is provided with the ball valve 5 and the filter 6), and the cooling plate 3 and the fan coil 4 in the variable frequency cabinet are cooled respectively; the refrigerant coming out of the variable frequency cabinet sequentially enters the evaporator 1 through the electronic expansion valve 8 (the electronic expansion valve EXV1 and the electronic expansion valve EXV 2) and the ball valve 5.
In the two cooling outputs, an orifice plate 7 is respectively arranged on one cooling output and the other cooling output.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (10)
1. A kind of frequency conversion cupboard cooling device used for water chilling unit, characterized by that: the condenser comprises two paths of cooling outputs, one path of cooling output is connected to a cooling plate in the frequency conversion cabinet, and the other path of cooling output is connected to a fan coil in the frequency conversion cabinet; at the outlet of the variable frequency cabinet, the heat dissipation plate and the fan coil are connected to the evaporator through an electronic expansion valve and a ball valve in sequence.
2. The variable frequency cabinet cooling device for a water chiller according to claim 1 wherein: the heat dissipation plate is connected to the evaporator through one path of refrigerant pipeline, the fan coil is connected to the evaporator through the other path of refrigerant pipeline, and the electronic expansion valve and the ball valve are respectively and sequentially arranged on the one path of refrigerant pipeline and the other path of refrigerant pipeline along the flowing direction.
3. The variable frequency cabinet cooling device for a water chiller according to claim 1 wherein: the supercooled liquid output by the condenser is divided into two paths of cooling outputs to be connected into the variable frequency cabinet after passing through the ball valve and the filter in sequence, or the supercooled liquid output by the condenser is connected into the variable frequency cabinet through the two paths of cooling outputs, and the ball valve and the filter are arranged on each path of cooling output.
4. The variable frequency cabinet cooling device for a water chiller according to claim 1 wherein: an orifice plate is disposed downstream of the filter.
5. The variable frequency cabinet cooling device for a water chiller according to claim 1 wherein: setting a temperature acquisition point of the IGBT of the radiating element; simultaneously, two temperature measuring points of the radiating plate are arranged, one temperature measuring point is close to a cooling inlet of the radiating plate, and the other temperature measuring point is close to a cooling outlet of the radiating plate; the inside and the outside of the variable frequency cabinet are respectively provided with a temperature acquisition point for acquiring the ambient temperature in the cabinet and the outdoor ambient temperature.
6. A variable frequency cabinet which is characterized in that: the cooling device of the variable frequency cabinet adopting the water chilling unit according to any one of claims 1-5 is suitable for cooling the low-voltage variable frequency cabinet with the input power of 500-1000 KW by using a refrigerant.
7. A cooling method of a variable frequency cabinet of a water chilling unit is characterized by comprising the following steps of: collecting the cooling inlet of the cooling plate, the cooling outlet of the cooling plate, the IGBT of the cooling element, the internal temperature of the variable frequency cabinet and the external temperature of the variable frequency cabinet; at least one of a cooling plate cooling control mode and a fan coil cooling control mode is used for cooling;
wherein:
the cooling control mode of the heat dissipation plate comprises the following steps: the refrigerant liquid enters the heat dissipation plate to cool the heating element in the variable frequency cabinet, the refrigerant flowing out of the heat dissipation plate returns to the evaporator through the refrigerant pipeline, the flow of the refrigerant entering the heat dissipation plate is regulated through the electronic expansion valve on the refrigerant pipeline, when the temperature of the heat dissipation plate is higher than the target temperature of the heat dissipation plate, the electronic expansion valve acts, the opening degree is increased, the refrigerant liquid supply amount of the heat dissipation plate is increased, and the temperature of the heat dissipation plate is reduced to the target temperature of the heat dissipation plate; when the temperature of the heat dissipation plate is lower than the target temperature of the heat dissipation plate, the electronic expansion valve acts, the opening degree is reduced, the refrigerant liquid supply amount of the heat dissipation plate is reduced, and the temperature of the heat dissipation plate is increased to the target temperature of the heat dissipation plate;
the fan coil cooling control mode comprises the following steps: the refrigerant liquid enters the fan coil, air in the cabinet is cooled through the fan coil, refrigerant flowing out of the fan coil returns to the evaporator through the other path of refrigerant pipeline, the flow of the refrigerant entering the fan coil is regulated through the electronic expansion valve on the other path of refrigerant pipeline, when the ambient temperature in the cabinet is higher than the target temperature of the fan coil, the electronic expansion valve acts, the opening degree is increased, the refrigerant liquid supply amount of the fan coil is increased, and the ambient temperature in the cabinet is reduced to the target temperature of the fan coil; when the environmental temperature in the cabinet is lower than the target temperature of the fan coil, the electronic expansion valve acts, the opening degree is reduced, the refrigerant liquid supply amount of the fan coil is reduced, and the environmental temperature in the cabinet is improved to the target temperature of the fan coil.
8. The method for cooling the variable frequency cabinet of the water chiller according to claim 7, wherein the method comprises the following steps: the cooling control mode of the heat dissipation plate comprises the following steps:
when the heat dissipation plate is at high temperature T HP,high -heat sink low temperature T HP,low dT1 is set according to the temperature difference, and the highest temperature T is acquired by the IGBT of the radiating element IGBT,Max For the control object, wherein the IGBT target temperature is set with T IGBT,target The IGBT bias sets dT0 value;
when the heat dissipation plate is at high temperature T HP,high -heat sink low temperature T HP,low＜ When dT2 is set by the temperature difference, the small-load condensation protection logic is exited, and the temperature average value T of the heat dissipation plate is adopted HP,avg As a control object, a target temperature T HP,target Taking (Cabinet external environment temperature T) AT,out +temperature difference setting dT 3) and (liquid supply temperature T) liq The +temperature difference sets the smaller of dT 4);
when the temperature of the heat dissipation plate is average T HP,avg When the temperature is higher than the target temperature of the heat dissipation plate, the electronic expansion valve on the one-path refrigerant pipeline acts, the opening degree is increased, the refrigerant liquid supply amount of the heat dissipation plate is increased, and the temperature average value T of the heat dissipation plate is reduced HP,avg To the target temperature T of the heat dissipation plate HP,target ；
When the temperature of the heat dissipation plate is average T HP,avg Below the target temperature T of the heat dissipation plate HP,target When the electronic expansion valve on the one-path refrigerant pipeline acts, the opening degree is reduced, the refrigerant liquid supply amount of the heat dissipation plate is reduced, and the temperature average value T of the heat dissipation plate is improved HP,avg To the target temperature T of the heat dissipation plate HP,target ；
T HP,avg ＝(T HP,high +T HP,low )/2；
T HP,target ＝Min(T AT,out +temperature difference set point dT3, T liq +temperature difference set point dT 4);
wherein: t (T) HP,avg The temperature average value of the heat dissipation plate is DEG C; t (T) HP,high The temperature is high for the heat dissipation plate; t (T) HP,low The temperature is high for the heat dissipation plate; t (T) HP,target The temperature is the target temperature of the heat dissipation plate; t (T) AT,out The temperature is the external environment temperature of the cabinet and is at the temperature of DEG C; t (T) liq The temperature of liquid supply and the temperature of the liquid supply are controlled; dT0 is a target temperature control deviation set value, DEG C; dTi is the temperature difference set value, DEG C.
9. The method for cooling the variable frequency cabinet of the water chiller according to claim 7, wherein the method comprises the following steps: the fan coil cooling control mode comprises the following steps: by using the internal environment temperature T of the cabinet AT,in As a control object, a target temperature T FCU,target Taking (Cabinet external environment temperature T) AT,out +temperature difference setting dT 5) and (liquid supply temperature T) liq The +temperature difference sets the smaller of dT 6);
when the environment temperature T in the frequency converter cabinet AT,in Above the target temperature T FCU,target When the electronic expansion valve on the other path of refrigerant pipeline acts, the opening degree is increased, the refrigerant liquid supply amount of the fan coil is increased, and the internal environment temperature T in the cabinet is reduced AT,in To a target temperature T FCU,target The method comprises the steps of carrying out a first treatment on the surface of the When the environment temperature T in the frequency converter cabinet AT,in Below the target temperature T FCU,target When the electronic expansion valve on the other path of refrigerant pipeline acts, the opening degree is reduced, the refrigerant liquid supply amount of the fan coil is reduced, and the environmental temperature T is improved AT,in To a target temperature T FCU,target ；T FCU,target ＝Min(T AT,out +dT5℃，T liq +dT6℃)；
Wherein: t (T) FCU,target The fan coil controls the target temperature, DEG C.
10. The method for cooling the variable frequency cabinet of the water chiller according to claim 7, wherein the method comprises the following steps: when the heat dissipation plate is at high temperature T HP,high Or the maximum temperature T of IGBT IGBT,Max When the temperature is more than or equal to T1 and less than T2, the electronic expansion valve on the other path of refrigerant pipeline is forcedly opened, and the unit is forbidden to increase load; when the heat dissipation plate is at high temperature T HP,high Or the maximum temperature T of IGBT IGBT,Max When the temperature is more than or equal to T2, the electronic expansion valve on the one-path refrigerant pipeline is forcedly opened, and the unit is forcedly unloaded; when the heat dissipation plate is at high temperature T HP,high Greater than or equal to T3 or T IGBT,Max When the temperature is greater than or equal to T4, starting a cabinet to alarm at high temperature; when the heat dissipation plate is at low temperature T HP,low Less than or equal to (cabinet internal environment temperature T) AT,in -the temperature difference is set dT 7) and the set time is continued, the low-temperature alarm of the cabinet is started; wherein Ti is a high-temperature protection temperature set value, DEG C, i is 1 to n, and n is a natural number.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117529065A (en) * | 2024-01-04 | 2024-02-06 | 浙江飞旋科技有限公司 | Control method and device, cooling system, frequency converter and frequency converter unit |
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| CN117529065A (en) * | 2024-01-04 | 2024-02-06 | 浙江飞旋科技有限公司 | Control method and device, cooling system, frequency converter and frequency converter unit |
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