CN101413768B - Anti-freeze protection device and method - Google Patents
Anti-freeze protection device and method Download PDFInfo
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- CN101413768B CN101413768B CN 200710181326 CN200710181326A CN101413768B CN 101413768 B CN101413768 B CN 101413768B CN 200710181326 CN200710181326 CN 200710181326 CN 200710181326 A CN200710181326 A CN 200710181326A CN 101413768 B CN101413768 B CN 101413768B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0017—Flooded core heat exchangers
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Abstract
The invention relates to a frost-protection device and a method, which is applied to providing the winter frost-protection for a flooded evaporator in a refrigeration system. The device comprises a connecting pipeline, a water pump, a heater and a one-way valve connected to the water outlet and water inlet of the flooded evaporator and forms a water circulation heating system together with a heat exchange tube inside the flooded evaporator. When the environment temperature or the refrigerant saturation temperature in the evaporator is lower than the start set value of an antifreeze water pump (recommended set value is 3.3 DEG C), the water pump is started to cause the water in the heat exchange tube to flow circularly; when the leaving water temperature in the flooded evaporator is lower than the start set value of the heater ( recommended set value is 20 DEG C), the heater is started to heat the water in the heat exchange tube and a temperature monitoring signal is respectively used for control the stop of the water pump and the heater, thus effectively preventing the water in the heat exchange tube from being frozen when the flooded evaporator ceases.
Description
[technical field]
The present invention relates to a kind of anti-freeze protection device and method, especially a kind of being applied in the refrigeration system is to the apparatus and method of carrying out the preventing freeze in winter protection of flooded evaporator.
[background technology]
Refrigeration system comprises evaporimeter, compressor, condenser, expansion valve and corresponding refrigerant pipe-line system usually at least.Wherein, the evaporimeter of cooling liquid refrigerating medium has shell and tube evaporator and water tank type evaporimeter, and shell and tube evaporator commonly used in the industry can be divided into flooded evaporator and dry evaporator.Fig. 1 is the internal structure sketch map of flooded evaporator, and the shell of this flooded evaporator is a barrel-type casing 1, and barrel-type casing 1 below is provided with the inlet 4 of cold-producing medium, and its top is provided with gas outlet 2.Inlet 4 and gas outlet 2 are through refrigerant pipe and the formation refrigerant closed-loop systems that link to each other such as outside condenser, freezing machine, expansion valve.There are a plurality of heat exchanger tubes 8 barrel-type casing 1 inside, and heat exchanger tube 8 two ends are connected with tube sheet 9, and tube sheet 9 links to each other with the hydroecium end cap 3 of barrel-type casing 1 both sides.The hydroecium end cap 3 of one side is provided with the water inlet 6 and delivery port 7 of media water.Water inlet 6 links to each other with outside water pump through corresponding pipeline with delivery port 7 and forms cold (heat) water circulation system.When the external water pump work, media water flow into the inside of heat exchanger tube 8 through the water inlet 6 of flooded evaporator, and carries out heat exchange with the cold-producing medium that gets into the liquid state in the barrel-type casings 1 through inlet 4.Cold (heat) water after the heat exchange flows out through the delivery port 7 of flooded evaporator, and is corresponding, and the cold-producing medium of saturated evaporation gets into compressor with the mode of gaseous state through 2 outflows of the gas outlet on the barrel-type casing.
Than dry evaporator, flooded evaporator is owing to adopt cold-producing medium in shell side, the structure of media water in heat exchanger tube, has that compact conformation, liquid contact with heating surface, heat transfer efficiency is high, easy to maintenance, high reliability features.But when freezing temperature and the operate outside pump that is lower than media water when ambient temperature quit work, the media water in the heat exchanger tube 8 stopped to flow, and the media coolant-temperature gage can progressively drop to freezing temperature, finally freezing and expansion and damage heat exchanger tube in hot replace tubes.In case heat exchanger tube 8 breaks; The cold-producing medium that is positioned at shell side 1 finally can merge with the media water that is positioned at heat exchanger tube 8 each other; Media water slowly gets in the shell side of evaporimeter; And liquid refrigerant also can flow in the heat exchanger tube 8 and leak, and this not only pollutes the environment, and also can finally cause whole flooded evaporator and even whole system loss of function.
In order to overcome this shortcoming, a kind of known way is outside the barrel-type casing of flooded evaporator, to attach the heating tape at present.When outside water pump quits work; When if the ambient temperature value of measuring is lower than set temperature value (for example 5 degrees centigrade); The controller of whole refrigeration system sends instruction; The heating tape begins the barrel-type casing of flooded evaporator is heated the freezing temperature that makes the internal temperature of whole flooded evaporator be higher than media water, thereby avoids the temperature of the media water in the heat exchanger tube to arrive media water freezing temperature and freezing phenomenon takes place.But the temperature of housing inner refrigerant also can progressively raise along with the heating of heating tape, and cold-producing medium constantly absorbs heat and converts gaseous state to, and progressively moves to the minimum zone of temperature in the cold-producing medium closed loop.This will cause the shell side of flooded evaporator finally to form cavity, make that heat that the heating tape produces can't be by timely absorption in shell side, cause the heating tape overheated and damage; And this method adopts the indirect method that the flooded evaporator cylindrical shell is heated, and causes most of heat to be absorbed by cold-producing medium, makes that this method utilization ratio is very low; And, because the temperature contrast in the cold-producing medium closed loop is bigger, strengthened other element operating loads, increased the unstability and the unreliability of system.
Therefore, provide a kind of utilization rate high, not fragile heater, the anti-freeze protection device with higher stability and reliability really is that the present technique field is required.
[summary of the invention]
The object of the present invention is to provide a kind of can stabilizing effective antifreeze device and the control method of protection flooded evaporator, and this device has high, the easy to maintenance characteristics of simple in structure, antifreeze efficient.
The objective of the invention is to realize through following technical scheme:
A kind of anti-freeze protection device is used at least one flooded evaporator and rests the anti-frost protection of period, and it comprises:
Connect pipeline, the delivery port of one of which end and this at least one flooded evaporator joins, and the water inlet of the other end and this at least one flooded evaporator joins, thereby constitutes water circulating pipe jointly with the inner heat exchanger tube of this at least one flooded evaporator;
Water pump is arranged in this water circulating pipe, and the water in the heat exchanger tube is circulated between said delivery port and water inlet;
Heater is arranged in this water circulating pipe, is used for the water of water circulating pipe is heated;
Control device; Be used for controlling the startup of water pump and heater and stopping according to the temperature value of measuring, wherein, when the saturation temperature of the environment temperature of mensuration or cold-producing medium is lower than antifreeze starting mode of pump setting value; Control device sends enabled instruction to water pump, makes the water pump entry into service; When the leaving water temperature of the delivery port of measuring is lower than the heater starting setting value; Control device sends enabled instruction to heater; Heater is heated the water in the water circulating pipe, and be higher than at the leaving water temperature of measuring and stop heating when heater rests setting value.
Anti-freeze protection device provided by the present invention wherein also comprises the check valve that is arranged in the water circulating pipe, so that the water in the water circulating pipe can only pass through water pump, heater and check valve to the water inlet one-way flow from the delivery port of flooded evaporator.
Anti-freeze protection device provided by the present invention, wherein, when the saturation temperature of cold-producing medium in environment temperature of measuring or the evaporimeter reached water pump and rests setting value, control device sent halt instruction to water pump, and water pump is shut down.
Anti-freeze protection device provided by the present invention, wherein, water pump, heater and check valve are to be arranged at said the connection on the pipeline.
Anti-freeze protection device provided by the present invention, wherein, being connected on the pipeline between the delivery port that heater is arranged on two adjacent flooded evaporators and the water inlet.
Anti-freeze protection device provided by the present invention, wherein, heater and check valve are to be arranged on the water pump, constitute the unidirectional water pump of a heated type.
Anti-freeze protection device provided by the present invention, wherein, it is starting mode of pump setting value+0.5 ℃ that water pump rests setting value, and the heater starting setting value can be made as 20 ℃, and heater rests setting value and can be made as 30 ℃.
The present invention also provides a kind of anti-frost protection method, is used for flooded evaporator and rests the anti-frost protection of period, comprising:
Utilize to connect delivery port and the water inlet that pipeline is connected to flooded evaporator, thus heat exchanger tube common a form water circulating pipe inner with flooded evaporator;
Water pump is serially connected with on the water circulating pipe, the water in the heat exchanger tube can be circulated between delivery port and water inlet;
Heater is arranged on the water circulating pipe;
Utilize control device to control the startup of water pump and heater according to the temperature value of measuring and stop, wherein
When the saturation temperature of cold-producing medium in environment temperature of measuring or the evaporimeter is lower than antifreeze starting mode of pump setting value, start water pump, the water in the water circulating pipe is circulated between delivery port and water inlet;
When the leaving water temperature heater starting setting value of the delivery port of measuring, start heater, the water in the water circulating pipe is heated;
When the leaving water temperature of the delivery port of measuring is higher than heater and rests setting value, stop heating.
Anti-frost protection method provided by the invention, wherein further serial connection one check valve on water circulating pipe makes the water in the water circulating pipe can only be from delivery port to the water inlet one-way flow.
Anti-frost protection method provided by the invention wherein when the saturation temperature of environment temperature of measuring or cold-producing medium reaches antifreeze water pump and rests setting value, stops the running of water pump.
Anti-frost protection method provided by the invention, wherein to rest setting value be starting mode of pump setting value+0.5 ℃ to water pump, and the heater starting setting value can be made as 20 ℃, and heater rests setting value and can be made as 30 ℃.
Compared with prior art; This anti-freeze protection device is owing to adopted the feedback loop system that the media water in the flooded evaporator is heated; That is to say; Directly media water is heated through temperature sensor measurement system environments temperature or through this media water heating circulation system of pressure transmitter mensuration cold-producing medium saturation temperature startup, and also in time feeding back to system controller stops this media water heating circulation system to measure the flooded evaporator leaving water temperature, makes whole device can effectively prevent freezing of media water; And having extraordinary stability and reliability, whole system is simple in structure, cost is low and easy to maintenance.
[description of drawings]
Fig. 1 is the structural representation of common flooded evaporator.
Fig. 2 is the structural representation of the anti-freeze protection device of flooded evaporator of the present invention.
Fig. 3 is the heater structure sketch map in the one embodiment of the invention.
Fig. 4 is the control flow chart of anti-freeze protection device of the present invention.
Fig. 5 is the structural representation of the anti-freeze protection device of another embodiment of the present invention.
[specific embodiment]
Understand easily, according to technical scheme of the present invention, under the situation that does not change connotation of the present invention, one of ordinary skill in the art can propose a plurality of implementations of anti-freeze protection device of the present invention and control method thereof.Therefore, the following specific embodiment and accompanying drawing only are to the illustrating of technical scheme of the present invention, and should not be regarded as of the present invention all or be regarded as restriction or qualification to technical scheme of the present invention.
In one embodiment of the invention; See also Fig. 2, the whole flooded evaporator systems that has anti-freeze protection device includes controller 1, flooded evaporator 2, water pump 3, heater 4, check valve 5, connects pipeline 6 and a plurality of temperature sensor and pressure transmitter (not shown) that is used to measure temperature.Wherein, The internal structure of flooded evaporator 2 can be joined shown in Figure 1; Need not apply speech here, its delivery port 22 links to each other with the water inlet of water pump 3 through pipeline 6, and the delivery port of water pump 3 links to each other with heater 4 water inlets through pipeline 6; The import that the delivery port of heater 4 connects to check valve 5 through pipeline 6, the delivery port of check valve 5 links to each other with the water inlet 21 of flooded evaporator 2 through pipeline 6.The work triggering signal of water pump 3 links to each other with controller 1, and the startup power supply of water pump 3 can be supplied with through controller 1, also can be supplied with by independent external power source.The triggering signal of heater 4 links to each other with controller 1, and the heating power supply of heater 4 can be supplied with through controller 1, also can be supplied with by external power source separately.
As shown in Figure 2; Controller 1 is used for according to the beginning of the temperature controlled water pump 3 of temperature sensor measurement and heater 4 work and stops; Controller 1 can adopt the master controller in the whole refrigeration system to realize the control to water pump 3 and heater 4; Also can small controller of extra employing as the slave station of master controller, individual responsibility begins and stops according to the temperature controlled water pump 3 of temperature sensor measurement and the work of heater 4.
When outside heat pump quit work and environment temperature or evaporimeter in the saturation temperature of cold-producing medium when being lower than setting value, water pump 3 is extracted the media water in the heat exchanger tube out from flooded evaporator 2 delivery ports 22, and the media water of extracting out is delivered to heater 4.In this invention, should select the water pump of suitable range, the media water that makes this water pump can provide enough power to be used in the flooded evaporator 2 forms media water heating circulation system in this anti-freeze protection device.But should avoid the range of water pump excessive; Otherwise cause easily being drawn out of at flooded evaporator 2 delivery ports 22 places by the media water that outside air conditioning terminal flows out; Flow through and flow back into the water inlet 21 of flooded evaporator 2 behind water pump, heater and the check valve of this anti-freeze protection device; And flow back into the water inlet of outside air conditioning terminal, form a media water heating circulation system beyond the heat exchanger tube of flooded evaporator.
When the flooded evaporator leaving water temperature is lower than setting value, utilize heater 4 to give media water heating, and the media water after will being heated is transported to the inlet of check valve 5 by water pump output.In one embodiment of the invention; As shown in Figure 3; Heater is a cavity shape structure, is respectively equipped with water inlet 411 that links to each other through pipeline 6 with the delivery port of water pump 3 and the delivery port 412 that links to each other through pipeline 6 with the water inlet of check valve on the cavity 41 of outside seal.Heater strip 42 is positioned at heater 4 internal cavities 43.
The control flow chart of anti-freeze protection device of the present invention is as shown in Figure 4, and in Fig. 4, LTD is meant evaporimeter shell side cold-producing medium saturation temperature, and OAT is meant environment temperature, and LWT is meant the evaporimeter leaving water temperature.During refrigeration system work; Outside air-conditioning pump operation is sent to the water inlet 21 of flooded evaporator 2 with media water and flow in the heat exchanger tube of flooded evaporator 2 inside; Cold-producing medium in flooded evaporator 2 shell sides and the media water in the heat exchanger tube carry out heat exchange; Media water after the heat exchange flows out through the delivery port 22 of flooded evaporator 2; At this moment, the media water that flows can be at the heat exchanger tube inner icing, and controller need not send work order to water pump in the anti-freeze protection device 3 and heater 4.Close, be outside air-conditioning water pump when quitting work that when refrigeration system the media water in the refrigeration system stops circulation, is full of media water in the heat exchanger tube, the temperature of the cold-producing medium that media water and shell side are interior can be progressively near ambient temperature.As the ambient temperature OAT of flooded evaporator 2 or cold-producing medium saturation temperature LTD approaches media water freezing temperature and during a little more than media water freezing temperature; If do not heat the media water in the heat exchanger tube of flooded evaporator 2 this moment, the temperature of the media water in the heat exchanger tube can continue progressively to descend and finally freeze.Therefore, when the saturation temperature value of the ambient temperature value of temperature sensor measurement or cold-producing medium was lower than antifreeze starting mode of pump setting value (for example 3.3 ℃), controller 1 sent enabled instruction, makes that the water pump in this protective device carries out work.
Should be noted that; It is not that starting mode of pump among this embodiment triggers temperature value (being antifreeze starting mode of pump setting value) that the stopping of water pump triggers temperature; But rest setting value than start triggering a slightly high antifreeze water pump of temperature value (antifreeze starting mode of pump setting value), for example be set at starting mode of pump setting value+0.5 ℃ (for example 3.8 ℃).That is to say; When environment temperature OAT or cold-producing medium saturation temperature LTD are lower than 3.3 degrees centigrade, triggering water pump starts working; Trigger water pump when being higher than 3.8 degrees centigrade and quit work, rather than the triggering water pump quits work when the saturation temperature of environment temperature or cold-producing medium is higher than 3.3 degrees centigrade.The purpose that is provided with like this is to trigger 3.3 degrees centigrade of variations up and down of temperature for fear of the saturation temperature when environment temperature or cold-producing medium; Perhaps owing to the temperature value of sensor measurement owing to the reason of certainty of measurement when triggering 3.3 degrees centigrade of values of temperature and fluctuate; Water pump 3 starts continually and stops under controller 1 commands for controlling, causes whole system unstable undesired with work easily.
Understand easily; It is not that unique, a fixing Temperature numerical is selected for 3.8 ℃ that 3.3 ℃ of antifreeze starting mode of pump setting values of being recommended in the foregoing description and water pump rest setting value; For one of ordinary skill in the art, these two set temperature value can be carried out suitable choice and change according to the needs of practical application.
After water pump 3 operate as normal, be positioned at the temperature sensor measurement flooded evaporator leaving water temperature LWT at delivery port 22 places of flooded evaporator 1.When flooded evaporator leaving water temperature LWT is lower than heater starting setting value (can be made as 20 degrees centigrade in a preferred embodiment); Controller 1 sends triggering command makes heater 4 start working; Media water to flow into heater 4 by water pump 3 delivery ports heats, and the media water after will heating gets in the heat exchanger tube of flooded evaporator 2 through the water inlet 21 that check valve 5 flows to flooded evaporator 2.Continuous heating through heater; The temperature of media water progressively rises; When heater of temperature arrival of media water rested setting value (for example can be set at 30 degrees centigrade in a preferred embodiment), controller 1 sends triggering command made heater 4 quit work.Through this control flow; This anti-freeze protection device can directly heat the media water in the flooded evaporator 2 effectively; Thereby prevented freezing of media water; And rationally control the startup of water pump 3 and heater 4, saved electric power and avoided the temperature of media water too high and cause media water to give cold-producing medium most of exchange heat.
Understand easily; It is not that unique, a fixing Temperature numerical is selected for 30 ℃ equally that 20 ℃ of heater starting setting values of being recommended in the foregoing description and heater rest setting value; One of ordinary skill in the art can be carried out suitable choice and change to these two set temperature value according to the needs of practical application.
A lot of refrigerating plants or air-conditioner host also include two even a plurality of flooded evaporator, and therefore, technical scheme of the present invention also can be applicable to have the anti-frost protection of the refrigeration system of a plurality of flooded evaporators series connection.In clearly demarcated another embodiment of basis shown in Figure 5, this anti-freeze protection device is used for the anti-frost protection of media water in the heat exchanger tube of two flooded evaporators.As shown in the figure; The media water that outside heat pump provides flows into from the water inlet 511 of flooded evaporator 51; The delivery port 512 of flooded evaporator 51 links to each other with the water inlet 521 of flooded evaporator 52; Media water flows out from the delivery port 522 of flooded evaporator 52, thereby supplies with the media water circulation that outside heat pump forms two evaporimeters, 51,52 internal heat exchange tubes.Similar with first embodiment; The delivery port 522 of flooded evaporator 52 links to each other with water pump 3 through pipeline 6; The delivery port of water pump 3 links to each other with heater 4 water inlets through pipeline 6; The import that the delivery port of heater 4 connects to check valve 5 through pipeline 6, the delivery port of check valve 5 connects the water inlet 511 to flooded evaporator 51.Be appreciated that water pump 3, heater 4 and/or check valve 5 also can be arranged on other positions, being connected on the pipeline between the delivery port 512 that for example heater is arranged on two adjacent flooded evaporators and the water inlet 521.Being connected of corresponding temperature sensor and controller 1 is identical with first embodiment.Can realize the anti-frost protection of this anti-freeze protection device through the control method identical to the media water in two flooded evaporators with first embodiment.
Understand easily; The present invention utilizes and connects delivery port and the water inlet that pipeline 6 is connected in flooded evaporator; Thereby the heat exchanger tube inner with flooded evaporator forms a water circulating pipe jointly, and water pump, heater and check valve are located in this water circulating pipe.According to this technical scheme, also have other various embodiments, for example change structure but the same heating function of realizing media water of heater; Change the connection sequencing between check valve, heater, the water pump; Heater is arranged in the heat exchanger tube of flooded evaporator; Heater is attached on the hydroecium end cap or advances, media water is heated on the standpipe; Even can check valve, heater and three independent components of water pump be merged into an element with these three independent component functions, directly be connected delivery port and/or water inlet of flooded evaporator etc.For being familiar with this operator in this area, to conspicuous modification and variation that above-mentioned these embodiment did, being claim scope of the present invention and containing according to technical scheme of the present invention.
Adopt anti-freeze protection device of the present invention to prevent the media water freezing in the full-liquid type flooded evaporator, simple in structure, working stability.And owing to adopt the temperature feedback control system, can effectively protect heater, make heater that arranged longer service life.
Claims (13)
1. anti-freeze protection device is used at least one flooded evaporator and rests the anti-frost protection of period, it is characterized in that said anti-freeze protection device comprises:
Connect pipeline; The delivery port of one of which end and said at least one flooded evaporator joins; The water inlet of the other end and said at least one flooded evaporator joins, thereby constitutes water circulating pipe jointly with the inner heat exchanger tube of said at least one flooded evaporator;
Water pump is arranged in the said water circulating pipe, and the water in the heat exchanger tube is circulated between said delivery port and water inlet;
Heater is arranged in the said water circulating pipe, is used for the water of said water circulating pipe is heated;
Control device; Be used for controlling the startup of said water pump and heater and stopping according to the temperature value of measuring; Wherein, When the saturation temperature of cold-producing medium in environment temperature of measuring or the flooded evaporator was lower than antifreeze starting mode of pump setting value, said control device sent enabled instruction to water pump, makes the water pump entry into service; When the leaving water temperature of the delivery port of measuring is lower than heater startup setting value; Control device sends enabled instruction to said heater; Heater is heated the water in the water circulating pipe, and be higher than at the leaving water temperature of measuring and stop heating when heater rests setting value.
2. anti-freeze protection device as claimed in claim 1; It is characterized in that; Said anti-freeze protection device also comprises the check valve that is arranged in the said water circulating pipe, so that the water in the water circulating pipe can only pass through water pump, heater and check valve to the water inlet one-way flow from the delivery port of flooded evaporator.
3. anti-freeze protection device as claimed in claim 2 is characterized in that, said water pump, heater and check valve are to be arranged at said the connection on the pipeline.
4. according to claim 1 or claim 2 anti-freeze protection device is characterized in that, being connected on the pipeline between the delivery port that said heater is arranged on two adjacent flooded evaporators and the water inlet.
5. anti-freeze protection device as claimed in claim 2 is characterized in that, said heater and check valve are to be arranged on the said water pump, constitutes the unidirectional water pump of a heated type.
6. anti-freeze protection device as claimed in claim 1 is characterized in that, when the saturation temperature of environment temperature of measuring or cold-producing medium reached water pump and rests setting value, said control device sent halt instruction to water pump, and water pump is shut down.
7. anti-freeze protection device as claimed in claim 6 is characterized in that, it is starting mode of pump setting value+0.5 ℃ that said water pump rests setting value.
8. anti-freeze protection device as claimed in claim 1 is characterized in that, said heater starts setting value can be made as 20 ℃, and heater rests setting value and can be made as 30 ℃.
9. anti-frost protection method is used for flooded evaporator and rests the anti-frost protection of period, it is characterized in that said method comprises:
Utilize to connect delivery port and the water inlet that pipeline is connected to flooded evaporator, thus heat exchanger tube common a form water circulating pipe inner with flooded evaporator;
Water pump is serially connected with on the said water circulating pipe, the water in the heat exchanger tube can be circulated between delivery port and water inlet;
Heater is arranged on the said water circulating pipe;
Utilize control device to control the startup of said water pump and heater according to the temperature value of measuring and stop, wherein
When the saturation temperature of cold-producing medium in environment temperature of measuring or the evaporimeter is lower than the starting mode of pump setting value, start said water pump, the water in the said water circulating pipe is circulated between delivery port and water inlet;
When the leaving water temperature of the delivery port of measuring is lower than heater startup setting value, start said heater, the water in the water circulating pipe is heated;
When the leaving water temperature of the delivery port of measuring is higher than heater and rests setting value, stop heating.
10. like the said anti-frost protection method of claim 9, it is characterized in that further serial connection one check valve on said water circulating pipe makes the water in the water circulating pipe can only be from delivery port to the water inlet one-way flow.
11. like the said anti-frost protection method of claim 9, it is characterized in that, when the saturation temperature of cold-producing medium in environment temperature of measuring or the evaporimeter reaches antifreeze water pump and rests setting value, stop the running of said water pump.
12. anti-frost protection method as claimed in claim 11 is characterized in that, it is starting mode of pump setting value+0.5 ℃ that said water pump rests setting value.
13. anti-frost protection method as claimed in claim 9 is characterized in that, said heater starts setting value can be made as 20 ℃, and heater rests setting value and can be made as 30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710181326 CN101413768B (en) | 2007-10-15 | 2007-10-15 | Anti-freeze protection device and method |
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| CN 200710181326 CN101413768B (en) | 2007-10-15 | 2007-10-15 | Anti-freeze protection device and method |
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| CN101413768A CN101413768A (en) | 2009-04-22 |
| CN101413768B true CN101413768B (en) | 2012-12-26 |
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| CN 200710181326 Expired - Fee Related CN101413768B (en) | 2007-10-15 | 2007-10-15 | Anti-freeze protection device and method |
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| CN102829649A (en) * | 2011-06-13 | 2012-12-19 | 上海金日冷却设备有限公司 | Anti-freezing device for closed cooling tower |
| CN104454501A (en) * | 2013-09-23 | 2015-03-25 | 陈剑波 | Water pump anti-freezer |
| CN106546005B (en) * | 2016-11-24 | 2019-04-02 | 广东美的暖通设备有限公司 | Protect the control equipment, method and small water dispenser unit of small water dispenser unit |
| CN107192184B (en) * | 2017-05-25 | 2019-11-05 | 重庆美的通用制冷设备有限公司 | The antifreeze method, apparatus and water-cooling screw rod unit of water-cooling screw rod unit |
| CN107388660B (en) * | 2017-07-19 | 2020-07-14 | Tcl空调器(中山)有限公司 | Anti-freezing method for air conditioner shell and tube, air conditioner and computer readable storage medium |
| CN107726682A (en) * | 2017-10-12 | 2018-02-23 | 青岛海尔空调电子有限公司 | The anti-refrigeration control method of source pump |
| CN109431675B (en) * | 2018-11-20 | 2024-05-28 | 珠海和佳医疗设备股份有限公司 | Heat exchange water tank of sub-low temperature therapeutic instrument |
| CN109612142A (en) * | 2018-12-20 | 2019-04-12 | 江阴爱尔姆真空设备有限公司 | A kind of flooded screw unit |
| CN111000294B (en) * | 2019-12-17 | 2022-07-08 | 深圳麦克韦尔科技有限公司 | Heating method and device of atomizer, computer equipment and storage medium |
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| JP2004051148A (en) * | 2002-07-19 | 2004-02-19 | Hagoromo Foods Kk | Method for sealing card-like article in assembly shrink package of canned food |
| CN1616894A (en) * | 2004-10-25 | 2005-05-18 | 天津中冷暖通洁净工程技术有限公司 | Integrated geo-source heat pump air conditioning unit |
| JP2006125769A (en) * | 2004-10-29 | 2006-05-18 | Denso Corp | Heat pump cycle device |
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