CN219914062U - Cooling tower freeze-proof device - Google Patents
Cooling tower freeze-proof device Download PDFInfo
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- CN219914062U CN219914062U CN202320487709.3U CN202320487709U CN219914062U CN 219914062 U CN219914062 U CN 219914062U CN 202320487709 U CN202320487709 U CN 202320487709U CN 219914062 U CN219914062 U CN 219914062U
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- water
- electric valve
- water outlet
- node
- outlet pipe
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- 238000001816 cooling Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 207
- 230000002528 anti-freeze Effects 0.000 claims description 10
- 230000002452 interceptive effect Effects 0.000 claims description 5
- 238000007710 freezing Methods 0.000 abstract description 9
- 230000008014 freezing Effects 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 description 12
- 239000003673 groundwater Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- Other Air-Conditioning Systems (AREA)
Abstract
The utility model provides an antifreezing device for a cooling tower, which comprises: the water inlet end of the water supply pipe is communicated with a geothermal water source, the water outlet end of the water supply pipe is connected with a first water inlet pipe, and a first electric valve is arranged on the water supply pipe; the water outlet end of the water outlet pipe is communicated with the water return well, and a second electric valve is arranged on the water outlet pipe; the third electric valve is arranged between the first node or the second node and the first heat exchanger; the temperature sensor is arranged on the first water outlet pipe, is positioned at the downstream of the heat exchange coil in the water flow direction and is used for detecting the temperature of water discharged by the heat exchange coil; the control unit is electrically connected with the temperature sensor, the first electric valve, the second electric valve and the third electric valve, and can receive the temperature value, and when the temperature value is smaller than a first preset value, the control unit controls the first electric valve and the second electric valve to be opened and controls the third electric valve to be closed. The utility model can prevent the heat exchange coil of the cooling tower from freezing and cracking, and is energy-saving and environment-friendly.
Description
Technical Field
The utility model relates to the technical field of central air conditioning systems, in particular to an antifreezing device for a cooling tower.
Background
At present, a large-scale air conditioning system is cooled in summer by a cooling tower, a heat exchange coil is arranged in the cooling tower, and the cooling effect is ensured by heat exchange of circulated air, spray water and circulating water in summer. However, in winter, the air conditioning system does not need to use a cooling tower for cooling, but the external environment temperature of the cooling tower is low, and water reserved in the heat exchange coil is easy to freeze. In order to prevent the heat exchange tube from cracking due to freezing of water reserved in the heat exchange coil of the cooling tower, the heat exchange coil needs to be subjected to anti-freezing treatment. At present, three measures of covering a heat insulation material, electrically heating and adding an antifreezing agent are mainly adopted as antifreezing measures for the heat exchange coil, but the antifreezing effect of the heat insulation material is difficult to achieve in extremely cold weather; the electric heating measure has large energy consumption, which is not beneficial to energy conservation; the problem of adding the antifreezing agent measures is that the antifreezing solution is easy to volatilize, and the antifreezing solution is polluting the environment after being discharged, thereby being unfavorable for environmental protection.
Disclosure of Invention
The utility model aims to solve the technical problem that a cooling tower heat exchange tube is easy to freeze and crack in winter. The utility model provides an antifreezing device for a cooling tower, which can prevent a heat exchange coil of the cooling tower from freezing and cracking, and is energy-saving and environment-friendly.
In order to solve the technical problem, the embodiment of the utility model provides an antifreezing device for a cooling tower, the cooling tower comprises a circulating pipeline, the circulating pipeline comprises a first heat exchanger, a first water inlet pipe, a heat exchange coil and a first water outlet pipe which are sequentially connected into a loop, a circulating pump is arranged on the first water outlet pipe, and the antifreezing device comprises:
the water inlet end of the water supply pipe is communicated with a geothermal water source, the water outlet end of the water supply pipe is communicated with a first water inlet pipe and is connected with a first node, and a first electric valve is arranged on the water supply pipe;
the water inlet end of the water outlet pipe is communicated with the first water outlet pipe and is communicated with the second node, the water outlet end of the water outlet pipe is communicated with the backwater well, and the water outlet pipe is provided with a second electric valve;
the third electric valve is arranged between the first node and the first heat exchanger or between the second node and the first heat exchanger;
the temperature sensor is arranged on the first water outlet pipe, is positioned at the downstream of the heat exchange coil in the water flow direction, and is used for detecting the temperature of water discharged by the heat exchange coil and outputting a temperature value;
the control unit is electrically connected with the temperature sensor, the first electric valve, the second electric valve and the third electric valve, and can receive the temperature value, and when the temperature value is smaller than a first preset value, the control unit controls the first electric valve and the second electric valve to be opened and controls the third electric valve to be closed; and when the temperature value is larger than a second preset value, controlling the first electric valve and the second electric valve to be closed and controlling the third electric valve to be opened.
Optionally, the geothermal water source and the backwater well are also communicated with a ground source heat pump unit, the ground source heat pump unit comprises a second water inlet pipe, a second heat exchanger and a second water outlet pipe which are sequentially connected, the water inlet end of the second water inlet pipe is communicated with the geothermal water source, and the water outlet end of the second water inlet pipe is communicated with the water inlet end of the water supply pipe and is communicated with a third node; the water outlet end of the second water outlet pipe is communicated with the backwater well, the water inlet end of the second water outlet pipe is communicated with the water outlet end of the water outlet pipe at a fourth node, the second heat exchanger is connected with the first heat exchanger in parallel, and the second heat exchanger is arranged between the third node and the fourth node.
Optionally, a water pump is arranged on the second water inlet pipe, the control unit is electrically connected with the water pump, and the control unit can control to increase the output efficiency of the water pump when the temperature value is smaller than a first preset value.
Optionally, the ground source heat pump unit further includes a fourth electric valve, which is disposed between the third node and the second heat exchanger or between the fourth node and the second heat exchanger, and the fourth electric valve is electrically connected to the control unit, and the control unit can control the fourth electric valve to be closed when the temperature value is smaller than the first preset value.
Optionally, the control unit includes an interactive interface, where the interactive interface is configured to receive a first preset value set by a user, receive an instruction for controlling opening and closing of the first electric valve, the second electric valve, the third electric valve, and the fourth electric valve by the user, receive an instruction for adjusting output efficiency of the water pump, and display opening and closing states of the first electric valve, the second electric valve, the third electric valve, and the fourth electric valve.
Optionally, the first electrically operated valve, the second electrically operated valve, the third electrically operated valve and the fourth electrically operated valve are all solenoid valves.
Optionally, the first preset value is 3-5 ℃, and the second preset value is 10-15 ℃.
Optionally, a cyclone sand remover is arranged on the second water inlet pipe and is used for removing sediment entering the second water inlet pipe from a geothermal water source.
Compared with the prior art, the utility model has the following beneficial effects:
according to the embodiment of the utility model, the circulating pipeline of the cooling tower is communicated with the geothermal water source, when the temperature value of water discharged by the heat exchange coil is smaller than a first preset value, the first electric valve and the second electric valve are opened, and the third electric valve is closed, so that the geothermal water source enters the first water inlet pipe, the heat exchange coil and the first water outlet pipe under the driving of the circulating pump, and the geothermal water source is introduced into the heat exchange coil to raise the temperature of the heat exchange coil due to the higher temperature of the geothermal water source, so that the water in the heat exchange coil is prevented from freezing, and the heat exchange coil is prevented from being frozen and cracked. In addition, when the temperature value of the water discharged by the heat exchange coil is larger than a second preset value, the heat exchange coil cannot be frozen rapidly, at the moment, the first electric valve and the second electric valve are closed, and the third electric valve is opened, so that the circulating pump can drive the water in the circulating pipeline to flow circularly, and the heat exchange coil is prevented from being frozen through the water in the circulating pipeline; meanwhile, because the circulating water in the circulating pipeline is the water introduced by the geothermal water source before, the circulating water has a certain temperature, and the circulating water enters the first heat exchanger in the circulating process to heat the first heat exchanger, so that the first heat exchanger is prevented from being frozen and cracked. Compared with the prior art that the heat exchange coil is electrically heated and the antifreeze is added, the geothermal water source is adopted to heat the heat exchange coil, so that the consumption of electric energy can be reduced, energy is saved, and environmental protection is facilitated.
Drawings
Fig. 1 shows a schematic view of an antifreezing device for a cooling tower according to an embodiment of the utility model.
Reference numerals:
1. the system comprises a first heat exchanger, a first water inlet pipe, a first heat exchange coil pipe, a first water outlet pipe, a circulating pump, a water supply pipe, a first node, a water outlet pipe, a second node, a water return pipe, a first electric valve, a second electric valve, a third electric valve, a temperature sensor, a second water inlet pipe, a second heat exchanger, a second water outlet pipe, a geothermal water source, a third node, a fourth node, a water pump and a rotational flow sand remover.
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present utility model with specific examples. While the description of the utility model will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the utility model described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the utility model. The following description contains many specific details for the purpose of providing a thorough understanding of the present utility model. The utility model may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the utility model. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present utility model.
The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.
The embodiment of the utility model provides an antifreezing device for a cooling tower, as shown in fig. 1, wherein the cooling tower comprises a circulating pipeline, the circulating pipeline comprises a first heat exchanger 1, a first water inlet pipe 2, a heat exchange coil 3 and a first water outlet pipe 4 which are sequentially connected into a loop, a circulating pump 5 is arranged on the first water outlet pipe 4, and the circulating pump 5 can drive water in the circulating pipeline to circularly flow in the circulating pipeline. The cooling tower is used for cooling the air conditioning system in summer, water in the first heat exchanger 1 absorbs heat from the air conditioning system through heat exchange in summer, and the circulating pump 5 drives the water in the first heat exchanger to flow into the heat exchange coil 3 through the first water inlet pipe 2; the heat exchange coil 3 is arranged in the cooling tower, spraying equipment is arranged in the cooling tower, and the spraying equipment sprays and cools the heat exchange coil 3, so that water in the heat exchange coil 3 is cooled, and the cooling of the air conditioning system is completed. The antifreeze device provided in this embodiment includes:
a water supply pipe 6, the water inlet end of which is communicated with a geothermal water source 18, the water outlet end of which is communicated with the first water inlet pipe 2 and is connected with a first node 7, and a first electric valve 11 is arranged on the water supply pipe 6;
the water inlet end of the water outlet pipe 8 is communicated with the first water outlet pipe 4 and is communicated with the second node 9, the water outlet end of the water outlet pipe 8 is communicated with the backwater well 10, and the water outlet pipe 8 is provided with a second electric valve 12;
a third electrically operated valve 13 provided between the first node 7 and the first heat exchanger 1 or between the second node 9 and the first heat exchanger 1;
the temperature sensor 14 is arranged on the first water outlet pipe 4, the first water outlet pipe 4 is positioned at the downstream of the heat exchange coil 3 along the water flow direction (shown as the X direction in fig. 1), and the temperature sensor 14 is used for detecting the temperature of water discharged by the heat exchange coil 3 and outputting a temperature value;
a control unit electrically connected with the temperature sensor 14, the first electric valve 11, the second electric valve 12 and the third electric valve 13, the control unit being capable of receiving the temperature value and controlling the first electric valve 11 and the second electric valve 12 to be opened and the third electric valve 13 to be closed when the temperature value is less than a first preset value; and when the temperature value is greater than the second preset value, controlling the first and second electrically operated valves 11 and 12 to be closed and controlling the third electrically operated valve 13 to be opened. Specifically, the first preset value is 3-5 ℃, and the second preset value is 10-15 ℃.
By adopting the technical scheme, the circulating pipeline of the cooling tower is communicated with the geothermal water source 18, when the temperature value of water discharged by the heat exchange coil 3 is smaller than a first preset value, the first electric valve 11 and the second electric valve 12 are opened, the third electric valve 13 is closed, the geothermal water source 18 enters the first water inlet pipe 2, the heat exchange coil 3 and the first water outlet pipe 4 under the driving of the circulating pump 5, and the geothermal water source 18 is introduced into the heat exchange coil 3 due to the higher temperature of the geothermal water source 18, so that the temperature of the heat exchange coil 3 can be increased, freezing of water in the heat exchange coil 3 is prevented, and the heat exchange coil 3 is prevented from being frozen. In addition, when the temperature value of the water discharged by the heat exchange coil 3 is greater than a second preset value, the heat exchange coil 3 is not frozen rapidly, and at the moment, the first electric valve 11 and the second electric valve 12 are closed, and the third electric valve 13 is opened, so that the circulating pump 5 can drive the water in the circulating pipeline to circulate, and the heat exchange coil 3 is prevented from freezing by the water in the circulating pipeline; meanwhile, because the circulating water in the circulating pipeline is the water introduced by the geothermal water source 18 before, the circulating water has a certain temperature, and the circulating water enters the first heat exchanger 1 in the circulating process to heat the first heat exchanger 1, so that the first heat exchanger 1 is prevented from being frozen and cracked. Compared with the prior art that the heat exchange coil 3 is electrically heated and the antifreeze is added, the geothermal water source 18 is adopted to heat the heat exchange coil 3, so that the consumption of electric energy can be reduced, energy is saved, and environmental protection is facilitated.
Further, the geothermal water source 18 and the backwater well 10 are also communicated with an active heat pump unit, the active heat pump unit comprises a second water inlet pipe 15, a second heat exchanger 16 and a second water outlet pipe 17 which are sequentially connected, the water inlet end of the second water inlet pipe 15 is communicated with the geothermal water source 18, and the water outlet end of the second water outlet pipe 17 is communicated with the backwater well 10; the ground source heat pump unit is an air conditioning system which uses terrestrial heat resources on the surface of the earth as cold and hot sources to perform energy conversion, the temperature of groundwater in summer is lower than the room temperature, the ground source heat pump unit inputs groundwater with relatively low temperature into the second heat exchanger 16, the groundwater exchanges heat with the air conditioning system in the second heat exchanger 16 so as to cool the air conditioning system, the temperature of groundwater in winter is higher than the room temperature, the ground source heat pump unit inputs groundwater with relatively high temperature into the air conditioning system, and the groundwater exchanges heat with the air conditioning system in the second heat exchanger 16 so as to warm the air conditioning system. The water inlet end of the water supply pipe 6 is communicated with the second water inlet pipe 15 to form a third node 19, so that a geothermal water source 18 can enter the heat exchange coil 3 through the second water inlet pipe 15 and the water supply pipe 6, the water outlet end of the water discharge pipe 8 is communicated with the second water outlet pipe 17 to form a fourth node 20, so that water in the water discharge pipe 8 can be discharged into the water return well 10 through the second water outlet pipe 17, and the second heat exchanger 16 is arranged between the third node 19 and the fourth node 20. In this embodiment, the heat exchange coil 3 and the second heat exchanger 16 are connected in parallel, so that the heat exchange coil 3 and the second heat exchanger 16 share the second water inlet pipe 15 and the second water outlet pipe 17 to perform water inlet and water outlet, thereby improving the utilization rate of the equipment.
Further, the second water inlet pipe 15 is provided with a water pump 21, the control unit is electrically connected with the water pump 21, and the control unit can control to increase the output efficiency of the water pump 21 when the temperature value is smaller than a first preset value, so that the flow rate of the geothermal water source 18 entering the water supply pipe 6 and the first water inlet pipe 2 from the second water inlet pipe 15 is increased, and the temperature rising speed of the heat exchange coil 3 is increased.
Further, the ground source heat pump unit comprises a fourth electric valve, which is arranged between the third node 19 and the second heat exchanger 16 or between the fourth node 20 and the second heat exchanger 16, and the fourth electric valve is electrically connected with the control unit, and the control unit can control the fourth electric valve to be closed when the temperature value is smaller than a first preset value, so that the geothermal water source 18 in the second water inlet pipe 15 is blocked from entering the second heat exchanger 16, and the geothermal water source 18 totally flows into the heat exchange coil 3, so that the heating speed of the heat exchange coil 3 is improved, and the freezing of water in the heat exchange coil 3 is prevented from causing the heat exchange coil 3 to crack.
Further, the control unit includes an interactive interface, the interactive interface is used for receiving a first preset value set by a user, receiving an instruction of controlling the first electric valve 11, the second electric valve 12, the third electric valve 13 and the fourth electric valve to be opened and closed by the user, and receiving an instruction for adjusting the output efficiency of the water pump 21, so that when the temperature sensor 14 fails, the user can manually control the anti-freezing device to operate; and the display device is used for displaying the states of the first electric valve 11, the second electric valve 12, the third electric valve 13 and the fourth electric valve, so that a user can know the running state of the antifreezing device in time.
Further, the first electrically operated valve 11, the second electrically operated valve 12, the third electrically operated valve 13 and the fourth electrically operated valve are all solenoid valves.
Further, a cyclone sand remover 22 is provided on the second water inlet pipe 15 for removing silt from the geothermal water source 18 into the second water inlet pipe 15. The sediment is prevented from being deposited in the heat exchange coil 3 to reduce the heat exchange efficiency of the heat exchange coil 3, and the sediment is prevented from rusting the heat exchange coil 3.
While the utility model has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the utility model with reference to specific embodiments, and it is not intended to limit the practice of the utility model to those descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present utility model.
Claims (8)
1. The utility model provides a cooling tower freeze-proof device, the cooling tower includes circulation pipeline, circulation pipeline is including the first heat exchanger, first inlet tube, heat exchange coil and the first outlet pipe that link into the return circuit in proper order, be equipped with the circulating pump on the first outlet pipe, its characterized in that, freeze-proof device includes:
the water inlet end of the water supply pipe is communicated with a geothermal water source, the water outlet end of the water supply pipe is communicated with the first water inlet pipe and is connected with a first node, and a first electric valve is arranged on the water supply pipe;
the water inlet end of the water outlet pipe is communicated with the first water outlet pipe and is communicated with the second node, the water outlet end of the water outlet pipe is communicated with the backwater well, and a second electric valve is arranged on the water outlet pipe;
the third electric valve is arranged between the first node and the first heat exchanger or between the second node and the first heat exchanger;
the temperature sensor is arranged on the first water outlet pipe, is positioned at the downstream of the heat exchange coil in the water flow direction, and is used for detecting the temperature of water discharged by the heat exchange coil and outputting a temperature value;
the control unit is electrically connected with the temperature sensor, the first electric valve, the second electric valve and the third electric valve, and can receive the temperature value, and when the temperature value is smaller than a first preset value, the control unit controls the first electric valve and the second electric valve to be opened and controls the third electric valve to be closed; and when the temperature value is larger than a second preset value, controlling the first electric valve and the second electric valve to be closed and controlling the third electric valve to be opened.
2. The antifreeze apparatus of claim 1, wherein said geothermal water source and said backwater well are further connected to a ground source heat pump unit, said ground source heat pump unit comprising a second water inlet pipe, a second heat exchanger and a second water outlet pipe connected in sequence, said second water inlet pipe having a water inlet end connected to the geothermal water source, said second water inlet pipe having a water outlet end connected to said water inlet end of said water supply pipe at a third node; the water outlet end of the second water outlet pipe is communicated with the backwater well, the water inlet end of the second water outlet pipe is communicated with the water outlet end of the water outlet pipe and is communicated with a fourth node, the second heat exchanger is in parallel connection with the first heat exchanger, and the second heat exchanger is arranged between the third node and the fourth node.
3. The antifreeze apparatus of claim 2, wherein a water pump is provided on the second water inlet pipe, and the control unit is electrically connected to the water pump, and is capable of controlling to increase the output efficiency of the water pump when the temperature value is less than the first preset value.
4. The antifreeze apparatus according to claim 3, wherein said ground source heat pump unit further comprises a fourth electrically operated valve provided between said third node and said second heat exchanger or between said fourth node and said second heat exchanger, said fourth electrically operated valve being electrically connected to said control unit, said control unit being capable of controlling said fourth electrically operated valve to be closed when said temperature value is smaller than said first preset value.
5. The antifreeze apparatus according to claim 4, wherein said control unit includes an interactive interface for receiving said first preset value set by a user, receiving an instruction for controlling opening and closing of said first electric valve, said second electric valve, said third electric valve, and said fourth electric valve by a user, receiving an instruction for adjusting output efficiency of the water pump, and displaying opening and closing states of said first electric valve, said second electric valve, said third electric valve, and said fourth electric valve.
6. The antifreeze apparatus of claim 4, wherein said first electrically operated valve, said second electrically operated valve, said third electrically operated valve, and said fourth electrically operated valve are solenoid valves.
7. The antifreeze device of any of claims 2 to 6, wherein said first preset value is 3 to 5 ℃ and said second preset value is 10 to 15 ℃.
8. The antifreeze apparatus of claim 7, wherein said second inlet pipe is provided with a cyclone separator for removing silt from a geothermal water source into said second inlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320487709.3U CN219914062U (en) | 2023-03-14 | 2023-03-14 | Cooling tower freeze-proof device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320487709.3U CN219914062U (en) | 2023-03-14 | 2023-03-14 | Cooling tower freeze-proof device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219914062U true CN219914062U (en) | 2023-10-27 |
Family
ID=88424363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320487709.3U Active CN219914062U (en) | 2023-03-14 | 2023-03-14 | Cooling tower freeze-proof device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219914062U (en) |
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2023
- 2023-03-14 CN CN202320487709.3U patent/CN219914062U/en active Active
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