CN201583078U - Natural liquid-supplementing constant-pressure device of glycol solution circulation system of ice storage system - Google Patents
Natural liquid-supplementing constant-pressure device of glycol solution circulation system of ice storage system Download PDFInfo
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- CN201583078U CN201583078U CN2009202113348U CN200920211334U CN201583078U CN 201583078 U CN201583078 U CN 201583078U CN 2009202113348 U CN2009202113348 U CN 2009202113348U CN 200920211334 U CN200920211334 U CN 200920211334U CN 201583078 U CN201583078 U CN 201583078U
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Abstract
The utility model discloses a natural liquid-supplementing constant-pressure device of a glycol solution circulation system of an ice storage system, comprising an expansion tank and a liquid storage tank, wherein the bottoms of the expansion tank and the liquid storage tank are connected with each other by a unidirectional communication pipe. In the utility model, when little leakage occurs to the glycol solution circulation system, the lost solution can be supplemented automatically by the gravity force rather than by a water pump, thus ensuring safe running of the system during small failure period.
Description
Technical field
The utility model relates to a kind of ethylene glycol solution circulatory system of ice-storage system, particularly a kind of natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system.
Background technology
Ice-storage system is to freeze by the ice making unit, the ethylene glycol solution temperature is dropped to-4 ℃～-6 ℃, ethylene glycol solution after will lowering the temperature by circulating pump again is pumped in the Ice storage coiled pipe, absorb the heat of the outside water of Ice storage coiled pipe, the temperature of ethylene glycol solution is elevated to after-1.5 ℃～-2 ℃, flow back to the ice making unit, thereby finish an ice making circulation.The outer water of Ice storage coiled pipe is cooled, and the back is continuous to lower the temperature, and final temperature reaches the freezing point and constantly glaciation.
The ethylene glycol solution circulatory system of ice-storage system is generally closed system.For guaranteeing the pressure stability of system, and in time replenish ethylene glycol solution when taking place to leak, need one cover level pressure and liquid supply device be installed to system in system.Constant pressure arrangement commonly used has two kinds: a kind of is the dynamical type constant pressure arrangement, and another kind is the static pressure type constant pressure arrangement.
The dynamical type constant pressure arrangement relies on a cover booster pump and a cover pressure release motor-driven valve to keep the pressure stability of system jointly, generally links to each other with the inlet segment of glycol system water circulating pump, is positioned at sustained height with water circulating pump.As shown in Figure 1, the dynamical type constant pressure arrangement has a cover intelligence control system, and the pressure that can monitoring system and the liquid level of expansion slot inside change.After the ethylene glycol solution circulatory system is devoted oneself to work, when the pressure of this system is higher than the maximum pressure setting value, control system will be opened the 7th motor-driven valve V7, and ethylene glycol solution is discharged in the expansion slot 11, be lower than the maximum pressure setting value up to pressure, close the 7th motor-driven valve V7 then; When the pressure of the ethylene glycol solution circulatory system is lower than the minimum pressure setting value, then open booster pump 12 by control system, the ethylene glycol solution of expansion slot 11 inside is pumped in the system, be higher than the minimum pressure setting value up to the pressure of the ethylene glycol solution circulatory system.In addition, when the ethylene glycol solution circulatory system takes place to leak, the dynamical type constant pressure arrangement at first adds in the system with the liquid of expansion slot inside, this can cause the reduction of the inner liquid level of expansion slot, when liquid level is reduced to the minimum liquid level setting value, controller will be opened the 8th motor-driven valve V8, and start fluid infusion pump 13, the ethylene glycol solution of irritating storage liquid interior is pumped in the expansion slot, is in the proper place to guarantee the inner liquid level of expansion slot place.
The static pressure type constant pressure arrangement relies on the natural static pressure of liquid to keep the stable of system pressure, is installed on system's peak, and higher more than 0.5 meter than peak, all keeps barotropic state with the pressure of each point of guaranteeing system.As shown in Figure 2, the static pressure type constant pressure arrangement has an expansion tube 15 that is connected with glycol circulation pump 14 import pipeline sections, when expanding when the ethylene glycol solution Yin Wendu of ethylene glycol solution circulatory system inside rising, ethylene glycol solution after volume increases will flow into expansion slot 11 by expansion tube 15, and reduce and when shrinking as the ethylene glycol solution Yin Wendu of ethylene glycol solution circulatory system inside, ethylene glycol solution in the expansion slot 11 then flows into system by expansion tube, by this " breathing " effect, can guarantee the stable of ethylene glycol solution circulatory system pressure.The expansion slot inside of this ethylene glycol solution circulatory system has a cover liquid-level switch, can control the start-stop of fluid infusion pump 13 according to the variation of liquid level in the expansion slot 11.When causing that when the ethylene glycol solution circulatory system generation leakage liquid level reduces in the expansion slot, liquid-level switch will start the fluid infusion pump, and the ethylene glycol solutions in the hopper 16 are delivered in the expansion slot 11, be in appropriate position to guarantee expansion slot 11 inner liquid levels.
But there are following problem in above-mentioned dynamical type constant pressure arrangement and static pressure type constant pressure arrangement:
A, dynamical type constant pressure arrangement capital equipment are pressure vessel, need the pressure stability that corresponding motor-driven valve, water pump and complicated pressure and level monitoring system keep system simultaneously and system is carried out fluid infusion, system complex, the cost height, the trouble point is many, the level pressure poor performance, the system pressure fluctuation ratio is bigger, and break down and can not open the time when the pressure release motor-driven valve, can cause system pressure to surpass the operating pressure of its permission, bring hidden danger on the safety to system.
The overfall of B, static pressure type constant pressure arrangement directly links to each other with sewer, in case overflow takes place, ethylene glycol solution will directly enter sewer and contaminated environment.
C, two kinds of devices that constant pressure arrangement is not all accurately monitored, calculated and report to the police the system leak amount can't be discerned the leakage of ice-storage system, and the security of system's operation is not effectively ensured.
D, above-mentioned two kinds of constant pressure arrangements all rely on water pump to carry out fluid infusion, in case solution pump breaks down, the solution that system runs off will can not get in time replenishing, and can influence the safe operation of system.
The utility model content
Technical problem to be solved in the utility model provides a kind of natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system, it is under the situation of ethylene glycol solution circulatory system generation small leakage, can pass through gravity rather than the water pump solution of replenish lost voluntarily, guarantee the safe operation of system during glitch, when overflow takes place because of expansion in system, can receive the solution that overflows, avoid contaminated environment, possess environment-friendly function.
For solveing the technical problem, the utility model provides a kind of natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system, it is characterized in that it comprises an expansion slot and a hopper, expansion slot links to each other by the unilaterally connected pipe in the bottom with hopper.
Preferably, the volume of described hopper is greater than the volume of expansion slot.
Preferably, described hopper and expansion slot are made monolithic construction, have a dividing plate between expansion slot and the hopper.
Preferably, described hopper and expansion slot are made split-type structural.
Preferably, described hopper and expansion slot are installed on the same horizontal plane, and hopper links to each other by the diconnected pipe at the top with expansion slot.
Preferably, described expansion slot has an expansion tube that is connected with glycol circulation Pump Suction Nozzle pipeline section.
Preferably, described expansion slot inside is equipped with a level monitoring device, and the expansion slot outside is equipped with an intelligence controlling device.
Preferably, described level monitoring device adopts minute-pressure formula pressure transmitter to monitor, intelligence controlling device adopts PLC controller and touch-screen, minute-pressure formula pressure transmitter comprises the electronic circuit that a micro-pressure sensor and head of liquid value that micro-pressure sensor is experienced convert normalized current/voltage signal to, and the PLC controller receives the normalized current/voltage signal of minute-pressure formula pressure transmitter as input signal.
Preferably, the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of described ice-storage system is a kind of with solution leakage monitoring function and possess the constant pressure arrangement of nature fluid infusion function.
Positive progressive effect of the present utility model is: the natural supplementing type constant pressure arrangement of the utility model ethylene glycol solution circulatory system is simple in structure, does not have moving component, and cost is low, non-failure operation time is long, and the life-span is long, and voltage regulation performance is good, system pressure is stable, and possesses environment-friendly function.
Description of drawings
Fig. 1 is the principle schematic of existing dynamical type constant pressure arrangement.
Fig. 2 is the principle schematic of existing static pressure type constant pressure arrangement.
Fig. 3 is the front view that the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of the utility model ice-storage system is a monolithic construction.
Fig. 4 is the vertical view that the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of the utility model ice-storage system is a monolithic construction.
Fig. 5 is applied in the principle schematic of the ethylene glycol solution circulatory system for the utility model monolithic construction.
Fig. 6 is the control principle schematic diagram of natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of the utility model ice-storage system.
Fig. 7 is the front view that the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of the utility model ice-storage system is a split-type structural.
Fig. 8 is the vertical view that the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of the utility model ice-storage system is a split-type structural.
The specific embodiment
Lift a preferred embodiment below, and come the clearer the utility model that intactly illustrates in conjunction with the accompanying drawings.
As shown in Figure 3 and Figure 4, the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of the utility model ice-storage system is a kind of with solution leakage monitoring function and possess the constant pressure arrangement of nature fluid infusion function, belongs to the static pressure type stable-pressure device.The natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system comprises an expansion slot 11 and a hopper 16, and the volume of hopper is greater than the volume of expansion slot, and the volumetric ratio of hopper and expansion slot is more than 2: 1.Hopper and expansion slot can be made monolithic construction or split-type structural.For monolithic construction, two grooves are kept apart with a dividing plate 17, the dividing plate height be the device whole height 85%～90% between, two grooves adopt unilaterally connected pipe 21 to link to each other in the bottom, this unilaterally connected pipe only allows liquid to flow to expansion slot by hopper, and can not flow to hopper by expansion slot.Expansion slot in this constant pressure arrangement mainly plays the level pressure effect, by level monitoring device that is installed on expansion slot inside and the intelligence controlling device that is installed on the expansion slot outside, can monitor, calculate and the liquid level variation of reporting system and the solution leakage rate of system simultaneously.Supplementing water interface 18 and expansion tube interface 19 are installed on the expansion slot, and the supplementing water interface links to each other with water supply pipe, only uses for debugging and when maintenance, should cut off when normally moving and being connected of running water pipe, and the expansion tube interface is connected with expansion tube.Expansion slot and hopper all are equipped with sewage draining exit 20, and sewage draining exit uses for when maintenance discharging ethylene glycol solution, and the ethylene glycol solution of discharge should recycle according to the pertinent regulations of country, should directly not enter the urban sewage system.During use, the ethylene glycol solution of adjusting ratio is put into hopper, the liquid level that makes hopper total height 50%～60% between, the solution amount of while Adjustment System, the highest liquid level of expansion slot reaches more than 70% of total height when making normal the operation, guarantees that the liquid level of expansion slot is higher than the liquid level of hopper.
As shown in Figure 5, the natural supplementing type constant pressure arrangement of the whole ethylene glycol solution circulatory system is positioned at the peak of the ethylene glycol solution circulatory system, expansion slot wherein has an expansion tube 15 that is connected with glycol circulation pump 14 import pipeline sections, when expanding when the ethylene glycol solution Yin Wendu of internal system rising, ethylene glycol solution after volume increases will flow into expansion slot 11 by expansion tube 15, the liquid level of expansion slot is raise, when the liquid level of expansion slot is higher than the dividing plate height, solution will flow into hopper (for split-type structural automatically from dividing plate, then be diconnected pipe inflow hopper by top), rather than enter in the environment; And reduce and when shrinking as the ethylene glycol solution Yin Wendu of internal system, ethylene glycol solution in the expansion slot then flows into system by expansion tube, the liquid level of expansion slot is reduced, when the liquid level of expansion slot is lower than the liquid level of hopper, the solution of hopper inside will flow into expansion slot by the unilaterally connected pipe of bottom.The unilaterally connected pipe can adopt the form of check valve, owing to adopt the form of check valve, even the liquid level of expansion slot is higher than hopper, solution can not flow into hopper by the unilaterally connected pipe of bottom yet, thereby guaranteeing has certain liquid level poor between two grooves, and this also provides assurance for the accurate solution leakage rate of measuring system.
When the ethylene glycol solution circulatory system is normally moved, system will write down the accurate liquid level of expansion slot under the different operating conditions (ice making operating mode, ice-melt operating mode, air conditioning condition), with this as the benchmark liquid level of system under corresponding operating mode, under the situation that system does not leak, this benchmark liquid level has metastable numerical value, under specific operation, by actual liquid level and the benchmark liquid level that is write down are compared, the solution (ethylene glycol solution) that can calculate system leaks volume (or leakage rate), and its computing formula (1) is as follows:
Δ V=Δ H*S ... formula (1)
In the formula, Δ V is that solution leaks volume or solution capacity changing value, and unit is m
3Δ H is the liquid level falling head with respect to the benchmark liquid level, and unit is m; S is the floor space of expansion slot, and unit is m
2
The purpose of the utility model constant pressure arrangement mainly is in time to judge the also leakage of reporting system, therefore allows certain error in the measurement of leaking volume.As shown in Figure 6, the utility model constant pressure arrangement also has level monitoring device and intelligence controlling device 22.Level monitoring device adopts minute-pressure formula pressure transmitter 23 to monitor, and this transmitter 23 comprises the electronic circuit that a micro-pressure sensor and head of liquid value that micro-pressure sensor is experienced convert normalized current/voltage signal of 4～20mA or 0～10V to.Whole transmitter immerses under the liquid level of expansion slot, and guarantees about the following 100mm of minimum level when operate as normal.According to different system's liquid storage gauge moulds, the expansion slot size is also different, and the size of the big more then expansion slot of scale is also big more, and selected transmitter range also can correspondingly be adjusted.Under common applicable cases, its minimum range scope is 0～500mm, and the maximum range scope without limits.The certainty of measurement of transmitter is 1%, and when selecting minimum range for use, the precision of its level monitoring can reach 5mm, also is 0.005m.Standard 4～20mA current signal that transmitter sends or 0～10V voltage signal can be uploaded to ice cold-storage control system 26, also can be used as the input signal of intelligence controlling device.
Intelligence controlling device is by the variation of liquid level, can calculate and report the solution leakage rate of the ethylene glycol solution circulatory system, intelligent controller itself possesses alarm indication and writing function, externally transmits alarm signal with the passive touch point mode simultaneously, for the usefulness of remote alarms.Intelligence controlling device adopts general PLC (Programmable Logic Controller, programmable logic controller (PLC)) as controller, and adopts the interface of touch-screen 24 as man-machine interaction.The PLC controller receives the normalized current/voltage signal of minute-pressure formula pressure transmitter as input signal, receive the decision signal of the operational mode signal of ice cold-storage control system simultaneously as system running pattern, simultaneously with system's liquid level measured value, calculate the system volume variable quantity of gained, the system leak alarm signal is as output parameter, be uploaded to ice cold-storage control system or third party's control system by communication cable 25, its operation principle is, after the ethylene glycol solution circulatory system reaches steady operational status, send instruction by operating personnel by touch-screen, the liquid level of expansion slot under the various different operational modes of opening entry, as the benchmark liquid level under this kind operational mode, afterwards, in the day-to-day operation process, monitor the liquid level of expansion slot according to the mode signal that ice cold-storage control system is sent, and the benchmark liquid level that will survey under this pattern of liquid level and system log (SYSLOG) compares, can report out the changing value of system's solution capacity, its solution capacity changing value calculates by above formula (1).For example, be 0.36m for floor space
2Expansion slot, when liquid level reduced 0.005mm than benchmark liquid level, system can calculate the solution capacity changing value and be: Δ V=Δ H*S=0.005*0.36=0.0018m
3=1.8L.Numerical value in the last example promptly is the minimum volume variable quantity that system can monitor, and the situation for liquid level reduces is system's solution leakage rate.The solution leakage alarm signal of intelligence controlling device compares the back by the measured value of volume-variation amount and alarm setting value and triggers, and when variable quantity during greater than setting value, carries out leakage alarm.The alarm setting value of leakage rate is preestablished as the default setting value according to the actual conditions of system by factory, also can be set up on their own by man-machine interface by the user simultaneously, to eliminate the false alarm that causes because of various uncertain factors.This intelligence controlling device for timely discovery system particularly the leakage of Ice storage coiled pipe reliable assurance is provided, improved the security of ice-storage system operation greatly.Hopper can directly absorb the solution that expansion slot overflows, greatly reduced environment damage, simultaneously because expansion slot needn't reserve safe clearance again, size can be accomplished as much as possible little, thereby improved the sensitivity that identification solution leaks.
The utility model constant pressure arrangement adopts the twin containers structure; both improved the sensitivity of system monitoring; guarantee that again there is the enough safe operation time in system when a large amount of the leakage taken place, for ice cold-storage control system handling failure wins time enough, the relevant device in the protection system.The sensitivity that system detects the solution leakage rate is by can detected minimum solution leakage rate deciding, and this value is more little, and then sensitivity is high more.According to formula (1), the solution leakage rate converts according to the liquid level variable quantity, under the constant situation of liquid level detection sensitivity, the sensitivity of solution leak detection then is inversely proportional to the floor space S of expansion slot, floor space is more little, and sensitivity is high more, therefore adopts the twin containers structure, the volume of expansion slot can be done for a short time, improve the sensitivity that the solution leakage rate detects with this.And at the same time, can do the volume of big hopper as required as far as possible, and to guarantee system's storage abundant solution is arranged, take place under a large amount of situations of leaking in system, there is enough solution to replenish, for ice cold-storage control system handling failure is striven for time enough.
Quantitatively, when system takes place to leak, rely on liquid storage, can guarantee the time such as the formula (2) of system's " in spite of illness " safe operation:
T=V/v ... formula (2)
In the formula, t also can be described as system and begins to leak into the device internal solution and exhaust the required time, and unit is minute; V is the total dischargeable capacity of the solution of constant pressure arrangement, is hopper and expansion slot solution capacity sum, and unit is L; V is a system leak speed, and unit is L/ minute.For example, for the monoblock type nature fluid infusion constant pressure arrangement that is of a size of 1200 * 800 * 1000 (length * wide * height) (in the conventional ice-storage system less a kind of specification), the length of its expansion slot is 400mm, the length of hopper is 800mm, the benchmark liquid level of expansion slot is 800mm, the liquid level of hopper is 600mm, and total dischargeable capacity is: V=0.8 * 0.8 * 0.6+0.8 * 0.4 * 0.8=0.64m3=640L; When a large amount of the leakage takes place in system, when reaching 100L/ minute such as leakage rate (so a large amount of leakage just might take place) under bust, from leaking into the Lou intact needed time be: 640/100=6.4 minute=384 seconds.At this moment in the interbody spacer; ice cold-storage control system can be finished the emergency protection of whole system is handled, and comprises the operation that stops the ice making unit, stops the operation of glycol circulation pump; close corresponding valve and send system failure signal etc., and be unlikely to result in greater loss to system.
The utility model constant pressure arrangement possesses nature fluid infusion function, under the situation of system's generation small leakage, can guarantee the safe operation of system during glitch by the solution of gravity rather than water pump nature replenish lost.The operation principle of nature fluid infusion is: when the expansion slot liquid level is lower than the hopper liquid level because of system's solution runs off, the solution in the hopper will flow into expansion slot by the unilaterally connected pipe voluntarily, and will be identical until both liquid levels.When the Yin Wendu of system raises and expands, when causing the expansion slot liquid level to raise, its solution then can not flow into hopper, so can guarantee system under the situation of slowly leaking, when intelligence controlling device sends warning, replenish certain solution voluntarily, guarantee that liquid level can not be lower than the minimum point of expansion slot, so that for before intervening, strive for time enough, guarantee the normal operation of system the people.
Wherein, system begins to leak into calculating such as the formula (3) above the alarm time of alarm setting value:
Ta=Vs/v ... formula (3)
In the formula, Ta also can be described as system and begins to leak into the time required above alarm setting value, and unit is minute; Vs is the leakage alarm setting value, and unit is L; V is a system leak speed, and unit is L/ minute.Be example with above-mentioned water tank also, the leakage rate of its minimum detectable is: 0.005 * 0.8 * 0.4=0.0016m3=1.6L; Suppose leakage rate that corresponding leakage alarm setting value measures for minimum detectable range 10 times, then leakage alarm sets value and is: Vs=10 * 1.6L=16L; When system leak speed was 1L/ minute, the safe operation time was in spite of illness: t=640/1=640 minute=10 hours; Alarm time is: Ta=16/1=16 minute, promptly when the leakage rate of system is 1L/ minute, this device began to report to the police during after leaking beginning 16 minutes, and within after this 10 hours, need not human intervention, and system can both continue safe operation.And for a correct safe system, unless bust takes place, otherwise 1L/ minute be a very big leakage rate.
In addition, as shown in Figure 7 and Figure 8, the expansion slot 11 and the hopper 16 of the utility model constant pressure arrangement also can be made split type structure, for separated structure, two grooves need be installed on the same horizontal plane, adopt unilaterally connected pipe 21 to link to each other in the bottom of two grooves, this unilaterally connected pipe only allows liquid to flow to expansion slot by hopper, and can not flow to hopper by expansion slot, but be to adopt the diconnected pipe to link to each other on 85%～95% the position of whole height at the height of two grooves, promptly two grooves link to each other by diconnected pipe 27 at the top.
Though the utility model constant pressure arrangement is for ice-storage system designs, and also can be applicable to similar closed cycle system, conventional air-conditioning chilled water system for example, all kinds of hypothermic saline cooling cycle systems etc.Intelligence controlling device focus on its computational methods and control logic, and do not lie in hardware aspect, any PLC product and microcomputerized control chip, peripheral circuit and hardware configuration through suitable adopt this algorithm and control logic all can realize this function.
Though more than described the specific embodiment of the present utility model, but those skilled in the art is to be understood that, these only illustrate, and under the prerequisite that does not deviate from principle of the present utility model and essence, can make numerous variations or modification to these embodiments.Therefore, protection domain of the present utility model is limited by appended claims.
Claims (8)
1. the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of an ice-storage system is characterized in that, it comprises an expansion slot and a hopper, and expansion slot links to each other by the unilaterally connected pipe in the bottom with hopper.
2. the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system as claimed in claim 1 is characterized in that the volume of described hopper is greater than the volume of expansion slot.
3. the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system as claimed in claim 1 is characterized in that described hopper and expansion slot are made monolithic construction, has a dividing plate between expansion slot and the hopper.
4. the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system as claimed in claim 1 is characterized in that described hopper and expansion slot are made split-type structural.
5. the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system as claimed in claim 4 is characterized in that, described hopper and expansion slot are installed on the same horizontal plane, and hopper links to each other by the diconnected pipe at the top with expansion slot.
6. as the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of claim 1 or 4 described ice-storage systems, it is characterized in that described expansion slot has an expansion tube that is connected with glycol circulation Pump Suction Nozzle pipeline section.
7. as the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of claim 1 or 4 described ice-storage systems, it is characterized in that described expansion slot inside is equipped with a level monitoring device, the expansion slot outside is equipped with an intelligence controlling device.
8. the natural supplementing type constant pressure arrangement of the ethylene glycol solution circulatory system of ice-storage system as claimed in claim 7, it is characterized in that, described level monitoring device adopts minute-pressure formula pressure transmitter to monitor, intelligence controlling device adopts PLC controller and touch-screen, minute-pressure formula pressure transmitter comprises the electronic circuit that a micro-pressure sensor and head of liquid value that micro-pressure sensor is experienced convert normalized current/voltage signal to, and the PLC controller receives the normalized current/voltage signal of minute-pressure formula pressure transmitter as input signal.
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| CN2009202113348U CN201583078U (en) | 2009-10-27 | 2009-10-27 | Natural liquid-supplementing constant-pressure device of glycol solution circulation system of ice storage system |
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| CN2009202113348U CN201583078U (en) | 2009-10-27 | 2009-10-27 | Natural liquid-supplementing constant-pressure device of glycol solution circulation system of ice storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042726B (en) * | 2009-10-23 | 2014-12-10 | 上海瀚显空调节能技术有限公司 | Natural solution-replenished constant-pressure device for ethylene glycol solution circulating system of ice cold accumulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042726B (en) * | 2009-10-23 | 2014-12-10 | 上海瀚显空调节能技术有限公司 | Natural solution-replenished constant-pressure device for ethylene glycol solution circulating system of ice cold accumulating system |
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| C14 | Grant of patent or utility model | ||
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Address after: 201803 room 29, No. 26, Lane 816, he Xuan Road, Shanghai, Jiading District Patentee after: Shanghai Hansienll Air Conditioning Energy Saving Technology Co., Ltd. Address before: Jiading District Jiangqiao town 201803 Shanghai Huajiang Road No. 20 block B -262 Patentee before: Shanghai Hansienll Air Conditioning Energy Saving Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20171027 |