CN111593790A - Liquid level protection method for ice pool of cold station - Google Patents
Liquid level protection method for ice pool of cold station Download PDFInfo
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- CN111593790A CN111593790A CN202010475310.4A CN202010475310A CN111593790A CN 111593790 A CN111593790 A CN 111593790A CN 202010475310 A CN202010475310 A CN 202010475310A CN 111593790 A CN111593790 A CN 111593790A
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- 238000000034 method Methods 0.000 title claims abstract description 46
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 230000008569 process Effects 0.000 abstract description 4
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- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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Abstract
The invention provides a liquid level protection method of an ice pool of a cold station, which is applied to a centralized cooling system and comprises the following steps: when the first liquid level (the liquid level of the first ice pool) is greater than a first preset liquid level and exceeds a first preset time, the valve executes a first emergency action; when the first liquid level is lower than a second preset liquid level, the valve is switched back to the state before action; when the first liquid level is greater than the third preset liquid level and less than the first preset liquid level, the opening degree of the valve is kept unchanged; when the first liquid level is greater than the first preset liquid level and exceeds the second preset time, and the action of the overflow switch exceeds the third preset time, the time for stopping the operation of the secondary pump is the fourth preset time; and when the first liquid level is greater than a first preset liquid level, the second liquid level (the liquid level of the second ice pool) is greater than a fourth preset liquid level and exceeds a second preset time, the valve executes a second emergency action. The liquid level protection method provided by the invention can alarm the liquid level of the ice pool of the cold station and automatically process the liquid level in time, so that the running safety of the cold supply system is guaranteed.
Description
Technical Field
The invention relates to the technical field of liquid level control, in particular to a liquid level protection method for an ice pool of a cold station.
Background
In recent years, with the rapid development of city construction in China, a plurality of high-density building groups (such as residential districts and commercial building groups) appear, and the high-density building groups are suitable for centralized cooling. The centralized cooling system is used as a part of a modern urban energy system, and has outstanding advantages in the aspects of improving the energy utilization efficiency, protecting the ecological environment, efficiently utilizing the building space, beautifying the urban image and the like.
With the further improvement of the energy-saving and environment-friendly requirements and the cooling fine management requirements, the scientific and reasonable requirements on the hydraulic balance adjustment of the centralized cooling system are more and more strong, and the liquid level and the flow of the ice pool of the cooling station need to be monitored in real time and controlled automatically and scientifically.
At present, although some liquid level control systems composed of a PLC or a singlechip are provided, most of the liquid level control systems have the problems of untimely data transmission and no visible picture operation, so that the cooling efficiency is reduced, and the cooling facility is possibly destroyed due to untimely data response.
Therefore, a scientific and reasonable method is urgently needed for automatically adjusting the liquid level and the flow of the ice pool, ensuring that the water supply temperature of the cold station meets the requirement, improving the utilization efficiency of the refrigerating unit and achieving the effects of energy conservation and environmental protection.
Disclosure of Invention
The invention aims to provide a liquid level protection method for an ice pool of a cold station, and aims to solve the technical problems that the liquid level alarm of the ice pool is not timely processed in the existing control method, and the operation safety of a cold supply system is influenced.
The purpose of the invention can be realized by the following technical scheme:
a liquid level protection method of an ice pool of a cold station is applied to a centralized cooling system, the system comprises a first-stage system and a second-stage system which are mutually communicated, the first-stage system comprises a first ice pool and a second ice pool, an overflow port is arranged on the side wall of the first ice pool, and a water flow switch sensor is arranged at the overflow port, and the liquid level protection method comprises the following steps:
when the first liquid level is greater than a first preset liquid level and the duration time exceeds a first preset time, controlling the valve to execute a first emergency action; wherein the first liquid level is the liquid level of a first ice pool;
when the first liquid level is lower than a second preset liquid level, controlling the valve to switch back to a pre-action state;
when the first liquid level is greater than a third preset liquid level and less than the first preset liquid level, the opening degree of the valve is kept unchanged;
when the first liquid level is greater than a first preset liquid level, the duration time exceeds a second preset time, and the action duration time of the overflow switch exceeds a third preset time, the time for stopping the operation of the secondary pump is a fourth preset time;
when the first liquid level is greater than a first preset liquid level, the second liquid level is greater than a fourth preset liquid level, and the duration time exceeds second preset time, controlling the valve to execute a second emergency action; wherein the second liquid level is the liquid level of the second ice pool.
Optionally, the method further comprises: the upper portions of the first ice pool and the second ice pool are respectively provided with three water return pipes, each water return pipe is provided with an adjusting valve, a lower water outlet pipe of the first ice pool is provided with a switch valve, and a lower water outlet pipe of the second ice pool is provided with an adjusting valve.
Optionally, the method further comprises: when the first liquid level is larger than a fifth preset liquid level, triggering light alarm;
optionally, the method further comprises: and when the first liquid level is greater than a sixth preset liquid level, triggering an alarm bell.
Optionally, the first emergency action is specifically: all valves on the return pipe of the first ice pool are closed, the valves on the water outlet pipe are opened, the first valve, the second valve and the third valve on the return pipe of the second ice pool are opened, the opening degree of the third valve is adjusted to be 60%, the valve on the water outlet pipe of the second ice pool is closed, and the opening degree of the valve on the chilled water conveying pipeline is adjusted to be 30%.
Optionally, the second emergency action specifically includes: all valves on the water return pipes and the water outlet pipes of the first ice pool and the second ice pool are closed, and the opening degree of the valves on the chilled water conveying pipeline is set to be 80%.
Optionally, the method further comprises: the second-stage system comprises a third ice pool and a fourth ice pool, and when the first liquid level is greater than a first preset liquid level, the second liquid level is greater than a fourth preset liquid level, the duration time of the first liquid level and the second liquid level exceeds a second preset time, and the action duration time of the overflow switch exceeds a third preset time, the time that the secondary pump of the first-stage system and the second-stage system stops running is the fourth preset time.
Optionally, the first preset time is 30 seconds, and the second preset time is 5 seconds.
Optionally, the third preset time is 10 seconds.
Optionally, the fourth preset time is 10 minutes.
The invention provides a liquid level protection method of an ice pool of a cold station, which is applied to a centralized cooling system, wherein the system comprises a first-stage system and a second-stage system which are mutually communicated, the first-stage system comprises a first ice pool and a second ice pool, the side wall of the first ice pool is provided with an overflow port, and the overflow port is provided with a water flow switch sensor, and the liquid level protection method comprises the following steps: when the first liquid level is greater than a first preset liquid level and the duration time exceeds a first preset time, controlling the valve to execute a first emergency action; wherein the first liquid level is the liquid level of a first ice pool; when the first liquid level is lower than a second preset liquid level, controlling the valve to switch back to a pre-action state; when the first liquid level is greater than a third preset liquid level and less than the first preset liquid level, the opening degree of the valve is kept unchanged; when the first liquid level is greater than a first preset liquid level, the duration time exceeds a second preset time, and the action duration time of the overflow switch exceeds a third preset time, the time for stopping the operation of the secondary pump is a fourth preset time; when the first liquid level is greater than a first preset liquid level, the second liquid level is greater than a fourth preset liquid level, and the duration time exceeds second preset time, controlling the valve to execute a second emergency action; wherein the second liquid level is the liquid level of the second ice pool. The liquid level protection method of the ice pool of the cold station can automatically and timely process the liquid level alarm of the ice pool of the cold station, automatically adjust the liquid level and the flow of the ice pool, effectively ensure that the liquid level in the ice pool is within the preset range, and ensure the running safety of a cooling system; the water supply temperature of the cold station can meet the requirement, the utilization efficiency of the refrigerating unit can be improved, and the effects of energy conservation and environmental protection are achieved.
Drawings
FIG. 1 is a schematic flow chart of a liquid level protection method for an ice pool of a cold station according to the present invention;
FIG. 2 is a schematic diagram of a centralized cooling system of a liquid level protection method for an ice pool of a cold station according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first system of a method for protecting the liquid level of an ice pool of a cold station according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second stage system of a liquid level protection method for an ice pool of a cold station according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a liquid level protection method for an ice pool of a cold station, and aims to solve the technical problems that the liquid level alarm of the ice pool is not timely processed in the existing control method, and the operation safety of a cold supply system is influenced.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The liquid level protection method of the ice pool of the cold station provided by the embodiment of the invention is applied to a centralized cooling system, the system comprises a first-stage system and a second-stage system which are mutually communicated, the first-stage system comprises a first ice pool and a second ice pool, the side wall of the first ice pool is provided with an overflow port, and the overflow port is provided with a water flow switch sensor, and the method comprises the following steps: when the first liquid level is greater than a first preset liquid level and the duration time exceeds a first preset time, controlling the valve to execute a first emergency action; wherein the first liquid level is the liquid level of a first ice pool; when the first liquid level is lower than a second preset liquid level, controlling the valve to switch back to a pre-action state; when the first liquid level is greater than a third preset liquid level and less than the first preset liquid level, the opening degree of the valve is kept unchanged; when the first liquid level is greater than a first preset liquid level, the duration time exceeds a second preset time, and the action duration time of the overflow switch exceeds a third preset time, the time for stopping the operation of the secondary pump is a fourth preset time; when the first liquid level is greater than a first preset liquid level, the second liquid level is greater than a fourth preset liquid level, and the duration time exceeds second preset time, controlling the valve to execute a second emergency action; wherein the second liquid level is the liquid level of the second ice pool.
According to the liquid level protection method for the ice pool of the cold station, the pressure loss difference of the water loops of each region is large during cold supply, and the chilled water system adopts a cold source side constant-flow primary pump and a load side variable-flow secondary pump system; in the centralized cooling system in the embodiment of the invention, 4 water loops are used according to the use subareas, the water loops are closed double-tube different-stroke circulation systems, and in order to solve the problem of unbalance of the water loop systems, dynamic balance valves are arranged at the horizontal branch pipes of each layer.
In the liquid level protection method for the ice pool of the cold station, provided by the embodiment of the invention, the first-stage system and the second-stage system belong to different network controllers, the network controllers can be communicated with each other, and the automatic control system server is communicated with the network controllers of the first-stage system and the second-stage system through a local area network. Aiming at the sudden event that the liquid level of the ice pool of the cold station in the first-stage system and the second-stage system exceeds a warning point, the automatic emergency treatment is carried out on the liquid level alarm of the ice pool through the automatic control system, and the operation safety is effectively guaranteed. The automatic control system can be niagara platform software, communicates with equipment by using a standard communication protocol, and can realize functions of data acquisition, logic operation analysis, graphic data display, data history record, instruction issuing and the like.
In the embodiment of the invention, the input type liquid level sensor is used for detecting the pressure of the water level, the input type liquid level sensor is based on the principle that the measured static pressure of the liquid is proportional to the height of the liquid, an advanced isolation type diffused silicon sensitive element or a ceramic capacitor pressure sensitive sensor is adopted, the static pressure is converted into an electric signal, the electric signal is converted into a standard electric signal (such as 4-20 mA) through temperature compensation and linear correction, and the liquid level of an ice pool can be displayed on an interface of an automatic control system in real time.
According to the liquid level protection method for the ice pool of the cold station, provided by the embodiment of the invention, the automatic control of the valve is controlled by numbers or digital intervals, namely, the unique state of the valve controlled by different numbers or digital intervals is correspondingly controlled. When the liquid level signal collected by the automatic control system reaches the emergency action condition of the ice pool valve, a defined number is output, the digital interval condition of the emergency action is reached, and then a corresponding instruction is output to the controlled valve at the same time. The same set of control program can be used for achieving the automatic operation and the emergency action of the valve.
The specific case one is as follows:
the first-stage system of the centralized cooling system comprises a first ice pool and a second ice pool, wherein the height of the first ice pool is 5500mm, the height of the second ice pool is 5400mm, the upper parts of the first ice pool and the second ice pool are respectively provided with three water return pipes, each water return pipe is provided with a regulating valve, the regulating valves on the upper part of the first ice pool are respectively V-W3, V-W4 and V-W5, and the regulating valves on the upper part of the second ice pool are respectively V-W6, V-W7 and V-W8; the lower water outlet pipe of the first ice pool is provided with a switch valve V-W11, the lower water outlet pipe of the second ice pool is provided with an adjusting valve V-W12, and the adjusting valve V-W9 is arranged on the first-stage system chilled water conveying pipeline. Carrying out liquid level protection on a first ice pool and a second ice pool in a first-stage system:
case (1): when the liquid level of the first ice pool is greater than 5300mm, triggering a light alarm;
case (2): when the liquid level of the first ice pool is greater than 5350mm, triggering an alarm bell;
case (3): when the liquid level of the first ice pool is greater than 5360mm and lasts for 30 seconds, the ice pool valve executes a first emergency action, specifically: closing V-W3, closing V-W4, closing V-W5, opening V-W11, adjusting the opening of V-W6 to 100%, adjusting the opening of V-W7 to 100%, adjusting the opening of V-W8 to 60%, closing V-W12 and adjusting the opening of V-W9 to 30%;
case (4): when the liquid level of the first ice pool is less than 5280mm, the valve is switched back to the state before action, and when 5180mm is less than 5360mm, the valve is kept in the original state;
case (5): when the liquid level of the first ice pool is more than 5360mm and lasts for 5 seconds and the overflow switch acts for 10 seconds, the secondary pump of the primary system stops running for 10 minutes;
case (6): when the liquid level of the first ice pool is more than 5360mm, the liquid level of the second ice pool is more than 5400mm and lasts for 5 seconds, the ice pool valve executes a second emergency action, which specifically comprises the following steps: V-W3 is closed, V-W4 is closed, V-W5 is closed, and V-W11 is closed; V-W6 is closed, V-W7 is closed, V-W8 is closed, V-W12 is closed, and the opening of V-W9 is adjusted to 80%;
case (7): after condition (6) was triggered and the overflow switch was actuated for 10 seconds, the secondary pumps of the first and second stage systems were simultaneously stopped for 10 minutes.
The specific case two is as follows:
the second-stage system of the centralized cooling system comprises a third ice pool and a fourth ice pool, wherein the height of the third ice pool is about 5350mm, the height of the fourth ice pool is about 5300mm, the upper parts of the third ice pool and the fourth ice pool are respectively provided with two water return pipes, each water return pipe is provided with a regulating valve, the regulating valves on the upper parts of the third ice pool are respectively V-W21 and V-W22, and the regulating valves on the upper parts of the fourth ice pool are respectively V-W23 and V-W24; the lower water outlet pipe of the third ice pool is provided with a switch valve V-W34, the lower water outlet pipe of the fourth ice pool is provided with a switch valve V-W35, and the chilled water conveying pipeline of the second-stage system is provided with a regulating valve V-W32. Liquid level protection is carried out on a third ice pool and a fourth ice pool in a second-stage system:
case (1): when the liquid level of the third ice pool is more than 5175mm, triggering light to alarm;
case (2): when the liquid level of the third ice pool is over 5200mm, triggering an alarm bell;
case (3): when the liquid level of the third ice bank is greater than 5250mm and lasts for 30 seconds, the ice bank valve executes a first emergency action, specifically: closing V-W21, closing V-W22, opening V-W34, adjusting the opening of V-W23 to 90%, adjusting the opening of V-W24 to 90%, closing V-W35 and adjusting the opening of V-W32 to 50%;
case (4): when the liquid level of the third ice pool is less than 5180mm, the valve is switched back to the state before action, and when the liquid level is less than 5250mm when the liquid level is less than 5180mm, the valve is kept in the original state;
case (5): when the liquid level of the third ice pool is greater than 5250mm and lasts for 5 seconds and the overflow switch acts for 10 seconds, the secondary pump of the second-stage system stops running for 10 minutes;
case (6): when the liquid level of the third ice pool is greater than 5250mm and the liquid level of the fourth ice pool is greater than 5300mm for 5 seconds, the ice pool valve executes a second emergency action, which specifically comprises the following steps: V-W21 is closed, V-W22 is closed, V-W34 is closed, V-W23 is closed, V-W24 is closed, V-W35 is closed, and the opening degree of V-W32 is adjusted to 80%;
case (7): after condition (6) was triggered and the overflow switch was actuated for 10 seconds, the secondary pumps of the first and second stage systems were simultaneously stopped for 10 minutes.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A liquid level protection method of an ice pool of a cold station is applied to a centralized cooling system, the system comprises a first-stage system and a second-stage system which are mutually communicated, the first-stage system comprises a first ice pool and a second ice pool, an overflow port is arranged on the side wall of the first ice pool, and a water flow switch sensor is arranged at the overflow port, and the liquid level protection method of the ice pool of the cold station is characterized by comprising the following steps:
when the first liquid level is greater than a first preset liquid level and the duration time exceeds a first preset time, controlling the valve to execute a first emergency action; wherein the first liquid level is the liquid level of a first ice pool;
when the first liquid level is lower than a second preset liquid level, controlling the valve to switch back to a pre-action state;
when the first liquid level is greater than a third preset liquid level and less than the first preset liquid level, the opening degree of the valve is kept unchanged;
when the first liquid level is greater than a first preset liquid level, the duration time exceeds a second preset time, and the action duration time of the overflow switch exceeds a third preset time, the time for stopping the operation of the secondary pump is a fourth preset time;
when the first liquid level is greater than a first preset liquid level, the second liquid level is greater than a fourth preset liquid level, and the duration time exceeds second preset time, controlling the valve to execute a second emergency action; wherein the second liquid level is the liquid level of the second ice pool.
2. The method for protecting the liquid level of the ice bank of the cold station as claimed in claim 1, further comprising: the upper portions of the first ice pool and the second ice pool are respectively provided with three water return pipes, each water return pipe is provided with an adjusting valve, a lower water outlet pipe of the first ice pool is provided with a switch valve, and a lower water outlet pipe of the second ice pool is provided with an adjusting valve.
3. The method for protecting the liquid level of the ice bank of the cold station as claimed in claim 2, further comprising: and when the first liquid level is greater than a fifth preset liquid level, triggering light to alarm.
4. The method for protecting the liquid level of the ice bank of the cold station as claimed in claim 3, further comprising: and when the first liquid level is greater than a sixth preset liquid level, triggering an alarm bell.
5. The liquid level protection method for the ice bank of the cold station as claimed in claim 1, wherein the first emergency action is specifically: all valves on the return pipe of the first ice pool are closed, the valves on the water outlet pipe are opened, the first valve, the second valve and the third valve on the return pipe of the second ice pool are opened, the opening degree of the third valve is adjusted to be 60%, the valve on the water outlet pipe of the second ice pool is closed, and the opening degree of the valve on the chilled water conveying pipeline is adjusted to be 30%.
6. The liquid level protection method for the ice bank of the cold station according to claim 1, wherein the second emergency action specifically comprises: all valves on the water return pipes and the water outlet pipes of the first ice pool and the second ice pool are closed, and the opening degree of the valves on the chilled water conveying pipeline is set to be 80%.
7. The method for protecting the liquid level of the ice bank of the cold station as claimed in claim 1, further comprising: the second-stage system comprises a third ice pool and a fourth ice pool, and when the first liquid level is greater than a first preset liquid level, the second liquid level is greater than a fourth preset liquid level, the duration time of the first liquid level and the second liquid level exceeds a second preset time, and the action duration time of the overflow switch exceeds a third preset time, the time that the secondary pump of the first-stage system and the second-stage system stops running is the fourth preset time.
8. The method for protecting the liquid level of the ice bank of the cold station as claimed in claim 1, wherein the first preset time is 30 seconds and the second preset time is 5 seconds.
9. The method for protecting the liquid level of the ice bank of the cold station as claimed in claim 1, wherein the third preset time is 10 seconds.
10. The method for protecting the liquid level of the ice bank of the cold station as claimed in claim 1, wherein the fourth preset time is 10 minutes.
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| CN202010475310.4A CN111593790B (en) | 2020-05-29 | 2020-05-29 | Liquid level protection method for ice pool of cold station |
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| CN202010475310.4A CN111593790B (en) | 2020-05-29 | 2020-05-29 | Liquid level protection method for ice pool of cold station |
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| CN207331822U (en) * | 2017-09-12 | 2018-05-08 | 湖南主导科技发展有限公司 | Feed water control system |
| US20190101309A1 (en) * | 2016-07-01 | 2019-04-04 | Jimmie Don Taylor | Water pressure alarm |
| CN209775500U (en) * | 2019-01-22 | 2019-12-13 | 吉林省宇光线缆有限公司 | Double-cooling system for extruder |
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| CN205606998U (en) * | 2016-04-25 | 2016-09-28 | 珠海华润包装材料有限公司 | Cooling water station and network system |
| US20190101309A1 (en) * | 2016-07-01 | 2019-04-04 | Jimmie Don Taylor | Water pressure alarm |
| CN207331822U (en) * | 2017-09-12 | 2018-05-08 | 湖南主导科技发展有限公司 | Feed water control system |
| CN209775500U (en) * | 2019-01-22 | 2019-12-13 | 吉林省宇光线缆有限公司 | Double-cooling system for extruder |
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| CN111593790B (en) | 2021-12-03 |
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