CN103322684A - Gas water heater and drainage freezing-preventing device thereof - Google Patents
Gas water heater and drainage freezing-preventing device thereof Download PDFInfo
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- CN103322684A CN103322684A CN2013102117246A CN201310211724A CN103322684A CN 103322684 A CN103322684 A CN 103322684A CN 2013102117246 A CN2013102117246 A CN 2013102117246A CN 201310211724 A CN201310211724 A CN 201310211724A CN 103322684 A CN103322684 A CN 103322684A
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Abstract
The invention provides a gas water heater and a drainage freezing-preventing device thereof. The drainage freezing-preventing device comprises an inlet drainage assembly, an outlet drainage assembly, a temperature sensor and a controller. The inlet drainage assembly is connected with a position between the water inlet end and a water inlet pipe of a heat exchanger of the gas water heater and provided with a first channel. The outlet drainage assembly is connected with a position between the water outlet end and a water outlet pipe of the heat exchanger of the gas water heater and provided with a second channel. One of the first channel and the second channel is a drainage channel, and the other one is a gas flow channel and connected with a gas pump. The controller is electrically connected with the inlet drainage assembly, the outlet drainage assembly and the temperature sensor to form a control loop. The drainage freezing-preventing device can drain water automatically according to the environment temperature, and a potential safety hazard that a water pipe of the heat exchanger cracks due to the fact that water in the water pipe is frozen when the environment temperature is low is avoided.
Description
Technical field
The present invention relates to the gas heater technical field, relate in particular to a kind of gas heater and drainage antifreezing device thereof.
Background technology
Existing gas heater, the water pipe of gas heater inner heat exchanger is because of the water freezing spalling in managing when preventing that environment temperature is low.Existing technical scheme adopts following four kinds of modes usually: electrical heating antifreezing, antifreeze, mechanical antifreeze, the manual relief valve draining of gas heating.
Front two kinds the antifreeze mode thermal efficiency is low, energy consumption is high, and needs continuous heating, and the water of keeping in the pipe is in liquid condition, consumes mass energy; The antifreeze cold air that can only stop of machinery pours in down a chimney from smoke exhaust pipe, and freezing of causing can't prevent for environment temperature is low; Manually the relief valve draining needs the draining of user's manual operations relief valve to reach antifreeze purpose, but the user usually forgets draining in the reality, weather at low temperature, cause the gas heater inner water tube by bursting by freezing, thereby the out of use thing of water heater occurs often, and be difficult to the water emptying in the water pipe of heat exchanger by the relief valve draining, still exist the water pipe of heat exchanger because of the hidden danger of the water freezing spalling in managing.
Summary of the invention
Main purpose of the present invention is to provide a kind of gas heater and drainage antifreezing device thereof, is intended to realize carrying out Auto-drainage according to environment temperature, eliminates water freezing in the water pipe of environment temperature heat exchanger when low and the hidden danger of spalling.
To achieve these goals, the invention provides a kind of drainage antifreezing device of gas heater, comprise the import drain assembly, the outlet drain assembly, temperature-sensitive sticker and controller, described import drain assembly is connected between the water inlet end of heat exchanger of gas heater and the water inlet pipe and is provided with first passage, described outlet drain assembly is connected between the water side of heat exchanger of gas heater and the outlet pipe and is provided with second channel, one of them of described first passage and second channel is drainage channel, wherein another of described first passage and second channel is gas channel and be connected with air pump, described controller and import drain assembly, outlet drain assembly and the temperature-sensitive sticker control loop that is electrically connected to form.
Preferably, described temperature-sensitive sticker is located at the optional position of gas heater with sense ambient temperature.
Preferably, described temperature-sensitive sticker is located on the tube wall of heat exchanger of gas heater the conduit temperature with the sense heat interchanger.
Preferably, described first passage is drainage channel, described second channel is gas channel and is connected with air pump, described import drain assembly comprises entering water electromagnetic valve and drain solenoid valve, described entering water electromagnetic valve is triple valve, has a water inlet valve port, one water outlet valve port and a draining valve port, the water inlet valve port of described entering water electromagnetic valve is connected with the water inlet end of described water inlet pipe and heat exchanger respectively with the water outlet valve port, the draining valve port of described entering water electromagnetic valve connects described first passage, described drain solenoid valve has two valve ports, two valve ports of described draining valve body connect respectively draining valve port and the drainpipe of described entering water electromagnetic valve, and consist of described first passage by described drain solenoid valve and drainpipe.
Preferably, described outlet drain assembly comprises tee one-way valve and described air pump, described tee one-way valve comprises two straight-through valve ports and a check-valve port, two straight-through valve ports of described tee one-way valve connect respectively water side and the outlet pipe of the heat exchanger of gas heater, and described air pump is connected with the check-valve port of described tee one-way valve by described second channel.
Preferably, described first passage is gas channel and is connected with air pump, described second channel is drainage channel, described import drain assembly comprises entering water electromagnetic valve and check valve, described entering water electromagnetic valve triple valve, have water inlet valve port, a water outlet valve port and a draining valve port, the water inlet valve port of described entering water electromagnetic valve is connected with the water inlet end of described water inlet pipe and heat exchanger respectively with the water outlet valve port, described check valve is connected with the draining valve port of entering water electromagnetic valve, and described air pump is connected with described check valve by described first passage.
Preferably, described outlet drain assembly comprises triple valve and drain solenoid valve, three valve ports of described triple valve connect respectively water side, outlet pipe and the second channel of heat exchanger, described drain solenoid valve has two valve ports, two valve ports of described drain solenoid valve are connecting tee valve and drainpipe respectively, and consists of described second channel by described drain solenoid valve and drainpipe.
The present invention also provides a kind of gas heater, and described gas heater comprises the drainage antifreezing device of aforesaid gas heater.
Gas heater of the present invention and drainage antifreezing device thereof, can carry out Auto-drainage to the heat exchanger of gas heater according to environment temperature, thereby eliminate water freezing in the water pipe of environment temperature heat exchanger when low and the hidden danger of spalling, described drainage antifreezing device is by adopting air pump, can farthest the ponding of heat exchanger be discharged, the interior residual ponding of water pipe of further eliminating heat exchanger freezes and the hidden danger of spalling.
Description of drawings
Fig. 1 is the structural representation of gas heater one preferred embodiment of the present invention.
Fig. 2 is the structural representation of entering water electromagnetic valve in the gas heater shown in Figure 1.
Fig. 3 is the structural representation of drain solenoid valve in the gas heater shown in Figure 1.
Fig. 4 is the structural representation of tee one-way valve in the gas heater shown in Figure 1.
Fig. 5 is the cutaway view of tee one-way valve shown in Figure 4.
Fig. 6 is the work hydrographic chart of gas heater shown in Figure 1.
Fig. 7 is the draining hydrographic chart that gas heater shown in Figure 1 starts the intelligent drainage function pattern.
Fig. 8 is the structural representation of another preferred embodiment of gas heater of the present invention.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
The specific embodiment
Should be appreciated that the specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
To shown in Figure 10, be a preferred embodiment of gas heater of the present invention such as Fig. 1.
Described gas heater is provided with drainage antifreezing device, is used for according to environment temperature the heat exchanger 10 of gas heater being carried out Auto-drainage, thereby eliminates water freezing in the water pipe of environment temperature heat exchanger 10 when low and the hidden danger of spalling.
Described drainage antifreezing device comprises import drain assembly 20, outlet drain assembly 30, temperature-sensitive sticker 40 and controller 50.Described import drain assembly 20 is connected between the water inlet end 11 and water inlet pipe 60 of heat exchanger 10 of gas heater, and described import drain assembly 20 is provided with first passage 21.Described outlet drain assembly 30 is connected between the water side 12 and outlet pipe 70 of heat exchanger 10 of gas heater, and described outlet drain assembly 30 is provided with second channel 31.Described first passage 21 is drainage channel with one of them of second channel 31, wherein another of described first passage 21 and second channel 31 is for gas channel and be connected with air pump 32, and described air pump 32 produces air-flow when heat exchanger 10 carries out draining mobile and discharge towards described drainage channel to open described gas channel and to order about ponding in the heat exchanger 10.
This case is preferred, and described temperature-sensitive sticker 40 is used for conduit temperature or the environment temperature of the heat exchanger 10 of sensing gas heater, to determine whether and need to carry out water-drainage antifreezing to heat exchanger 10.Except temperature-sensitive sticker 40 preferred aspects, can also design like this: the optional position that described temperature-sensitive sticker 40 can be higher than gas heater is with sense ambient temperature, or is located on the tube wall of heat exchanger 10 conduit temperature with sense heat interchanger 10.
Described controller 50 and import drain assembly 20, outlet drain assembly 30 and temperature-sensitive sticker 40 control loop that is electrically connected to form carries out corresponding control with the temperature according to 40 sensings of temperature-sensitive sticker to import drain assembly 20 and outlet drain assembly 30.
In the present embodiment, described import drain assembly 20 comprises entering water electromagnetic valve 22 and drain solenoid valve 23.As shown in Figure 2, described entering water electromagnetic valve 22 is triple valve, comprise triple-valve body 221 and control assembly 222, described triple-valve body 221 has water inlet valve port 223, a water outlet valve port 224 and a draining valve port 225, the water inlet valve port 223 of described triple-valve body 221 is connected with the water inlet end 11 of water inlet pipe 60 and heat exchanger 10 respectively with water outlet valve port 224, the draining valve port 225 of described triple-valve body 221 connects described first passage 21, and described control assembly 222 is electrically connected with described controller 50.
As shown in Figure 3, described drain solenoid valve 23 comprises draining valve body 231 and control assembly 232, described draining valve body 231 has two valve ports 233, two valve ports 233 of described draining valve body 231 connect respectively draining valve port 225 and the drainpipe 24 of described entering water electromagnetic valve 22, and consist of described first passage 21 by described drain solenoid valve 23 and drainpipe 24, the described first passage 21(of described drain solenoid valve 23 controls is drainage channel) open and close.
Described outlet drain assembly 30 comprises air pump 32 and tee one-way valve 33.Such as Fig. 4 and shown in Figure 5, described tee one-way valve 33 comprises two straight-through valve ports 331 and a check-valve port 332, two straight-through valve ports 331 of described tee one-way valve 33 connect respectively the water side 12 and outlet pipe 70 of the heat exchanger 10 of gas heater, the check-valve port 332 of described tee one-way valve 33 adopts pneumatic mode to open, described second channel 31 is gas channel, described air pump 32 is connected with the check-valve port 332 of described tee one-way valve 33 by described second channel 31, and described air pump 32 is selected micro air pump.Described air pump 32 starts when heat exchanger 10 carries out draining and produces the check-valve port 332 of air-flow to open described tee one-way valve 33, and the ponding that orders about heat exchanger 10 is drainage channel towards first passage 21() flow.
As shown in Figure 6, be the work hydrographic chart of the present embodiment gas heater.Under normal operating position, entering water electromagnetic valve 22 is in open mode, the water inlet valve port 223 of entering water electromagnetic valve 22, water outlet valve port 224 and draining valve port 225 are interconnected, and the cold water in the water inlet pipe 60 can enter into heat exchanger 10 through water inlet valve port 223, the water outlet valve port 224 of entering water electromagnetic valve 22.Under normal operating position, drain solenoid valve 23 is in closed condition, and two valve ports 233 of drain solenoid valve 23 are not communicated with, and the cold water that is entered entering water electromagnetic valve 22 by water inlet pipe 60 can't flow to drainpipe 24 through drain solenoid valve 23.The cold water that enters into heat exchanger 10 flows to water side 12 after heating, two straight-through valve ports 331 of tee one-way valve 33 are communicated with all the time, the check-valve port 332 of tee one-way valve 33 remains closed, air pump 32 does not start when gas heater normally uses, therefore, hot water after heat exchanger 10 heating can flow to outlet pipe 70 for the user through tee one-way valve 33, and can't flow to second channel 31 through check-valve port 332.
As shown in Figure 7, start the draining hydrographic chart of intelligent drainage function pattern for the present embodiment gas heater.When the user does not use water heater, the end of outlet pipe 70 is in closed condition, the temperature that temperature-sensitive sticker 40 senses is lower than preset value, controller 50 starts the intelligent drainage function pattern, at this moment, and under the control action of controller 50, entering water electromagnetic valve 22 valve-offs, be not communicated with between the water inlet valve port 223 of entering water electromagnetic valve 22 and water outlet valve port 224 and the draining valve port 225, water outlet valve port 224 and draining valve port 225 be for being communicated with, thereby cut off water inlet.Drain solenoid valve 23 is opened valve, and two valve ports 233 of drain solenoid valve 23 are interconnected, thereby open drainage channel.Described air pump 32 energisings produce the check-valve port 332 of air-flow to open tee one-way valve 33, under the effect of air pump 32 air-flow that produces, the ponding that orders about in the heat exchanger 10 is flowed towards water inlet end 11 by water side 12, then after flowing to drainpipe 24 behind entering water electromagnetic valve 22, the drain solenoid valve 23, discharge, thereby reach self-draining effect.Described air pump 32 can produce stronger air-flow, thereby the ponding that order about in the heat exchanger 10 flow and finish rapidly discharge towards drainpipe 24.Controller 50 can be set water discharge time, after draining is complete, and drain solenoid valve 23 and air pump outage, thereby saves energy.Therefore, when without water heater, the ponding in the heat exchanger 10 can be discharged fully by drainage antifreezing device, in the heat exchanger 10 without ponding, with regard to can not be because of cold weather the bursting by freezing water pipe.
In the present embodiment, described first passage 21 is drainage channel, and described second channel 31 is for gas channel and be connected with air pump 32, and during discharge, ponding is flowed and discharges towards water inlet end 11 by the water side 12 of heat exchanger 10.In other embodiments, ponding 12 is flowed and discharges towards the water side by the water inlet end 11 of heat exchanger 10.
Be illustrated in figure 8 as another preferred embodiment of gas heater of the present invention.
Described gas heater is provided with drainage antifreezing device, is used for according to environment temperature the heat exchanger 10 of gas heater being carried out Auto-drainage, thereby eliminates water freezing in the water pipe of environment temperature heat exchanger 10 when low and the hidden danger of spalling.
In the present embodiment, described drainage antifreezing device comprises import drain assembly 20a, outlet drain assembly 30a, temperature-sensitive sticker 40 and controller 50.Described import drain assembly 20a is connected between the water inlet end 11 and water inlet pipe 60 of heat exchanger 10 of gas heater, and described import drain assembly 20a is provided with first passage 21a.Described outlet drain assembly 30a is connected between the water side 12 and outlet pipe 70 of heat exchanger 10 of gas heater, and described outlet drain assembly 30a is provided with second channel 31a.
In the present embodiment, described first passage 21a is gas channel and is connected with air pump 32, and described second channel 31a is drainage channel.Described air pump 32 produces air-flow and flows and discharge towards described drainage channel with the ponding of opening described gas channel and order about in the heat exchanger 10 when heat exchanger 10 carries out draining.
Described temperature-sensitive sticker 40 is used for conduit temperature or the environment temperature of the heat exchanger 10 of sensing gas heater, to determine whether and to carry out water-drainage antifreezing to heat exchanger 10, the optional position that described temperature-sensitive sticker 40 can be higher than gas heater is with sense ambient temperature, or is located on the tube wall of heat exchanger 10 conduit temperature with sense heat interchanger 10.
Described controller 50 and import drain assembly 20a, outlet drain assembly 30a and temperature-sensitive sticker 40 control loop that is electrically connected to form carries out corresponding control with the temperature according to 40 sensings of temperature-sensitive sticker to import drain assembly 20a and outlet drain assembly 30a.
In the present embodiment, described import drain assembly 20a comprises entering water electromagnetic valve 22a and check valve 25.The structure of described entering water electromagnetic valve 22a is identical with the structure of entering water electromagnetic valve 22 among the last embodiment, and described check valve 25 adopts pneumatic mode to open.Described check valve 25 is connected with the draining valve port of entering water electromagnetic valve 22a, and described air pump 32 is connected with described check valve 25 by described first passage 21a.
Described outlet drain assembly 30a comprises triple valve 33a and drain solenoid valve 23a.Three valve ports of described triple valve 33a connect respectively water side 12, outlet pipe 70 and the second channel 31a of heat exchanger 10.The structure of the drain solenoid valve 23 among the structure of described drain solenoid valve 23a and the last embodiment is identical, two valve ports of drain solenoid valve 23a are connecting tee valve 33a and drainpipe 24 respectively, and consists of described second channel 31a by described drain solenoid valve 23a and drainpipe 24.
In the present embodiment, when heat exchanger 10 was carried out draining, under the control action of controller 50, entering water electromagnetic valve 22a closed to cut off water inlet, and drain solenoid valve 23a opens drainage channel.Described air pump 32 energisings produce air-flow to open check valve 25, under the effect of air pump 32 air-flow that produces, the ponding that orders about in the heat exchanger 10 12 is flowed towards the water side by water inlet end 11, then after flowing to drainpipe 24 behind triple valve 33a, the drain solenoid valve 23a, discharge, thereby reach self-draining effect.Need not when in the present embodiment, carrying out Auto-drainage to consider whether the end of outlet pipe 70 closes.
In the above-mentioned gas heater, by drainage antifreezing device is set, can carry out Auto-drainage to the heat exchanger of gas heater according to environment temperature, thereby eliminate water freezing in the water pipe of environment temperature heat exchanger when low and the hidden danger of spalling, described drainage antifreezing device is by adopting air pump, can farthest the ponding of heat exchanger be discharged, the interior residual ponding of water pipe of further eliminating heat exchanger freezes and the hidden danger of spalling.
The present invention is not limited to above embodiment, under the disclosed technology contents of above-mentioned embodiment, can also carry out various variations.Every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to do, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (8)
1. the drainage antifreezing device of a gas heater, it is characterized in that, comprise the import drain assembly, the outlet drain assembly, temperature-sensitive sticker and controller, described import drain assembly is connected between the water inlet end of heat exchanger of gas heater and the water inlet pipe and is provided with first passage, described outlet drain assembly is connected between the water side of heat exchanger of gas heater and the outlet pipe and is provided with second channel, one of them of described first passage and second channel is drainage channel, wherein another of described first passage and second channel is gas channel and be connected with air pump, described controller and import drain assembly, outlet drain assembly and the temperature-sensitive sticker control loop that is electrically connected to form.
2. the drainage antifreezing device of gas heater as claimed in claim 1 is characterized in that, described temperature-sensitive sticker is located at the optional position of gas heater with sense ambient temperature.
3. the drainage antifreezing device of gas heater as claimed in claim 1 is characterized in that, described temperature-sensitive sticker is located on the tube wall of heat exchanger of gas heater the conduit temperature with the sense heat interchanger.
4. the drainage antifreezing device of gas heater as claimed in claim 1, it is characterized in that, described first passage is drainage channel, described second channel is gas channel and is connected with air pump, described import drain assembly comprises entering water electromagnetic valve and drain solenoid valve, described entering water electromagnetic valve is triple valve, has a water inlet valve port, one water outlet valve port and a draining valve port, the water inlet valve port of described entering water electromagnetic valve is connected with the water inlet end of described water inlet pipe and heat exchanger respectively with the water outlet valve port, the draining valve port of described entering water electromagnetic valve connects described first passage, described drain solenoid valve has two valve ports, two valve ports of described draining valve body connect respectively draining valve port and the drainpipe of described entering water electromagnetic valve, and consist of described first passage by described drain solenoid valve and drainpipe.
5. the drainage antifreezing device of gas heater as claimed in claim 4, it is characterized in that, described outlet drain assembly comprises tee one-way valve and described air pump, described tee one-way valve comprises two straight-through valve ports and a check-valve port, two straight-through valve ports of described tee one-way valve connect respectively water side and the outlet pipe of the heat exchanger of gas heater, and described air pump is connected with the check-valve port of described tee one-way valve by described second channel.
6. the drainage antifreezing device of gas heater as claimed in claim 1, it is characterized in that, described first passage is gas channel and is connected with air pump, described second channel is drainage channel, described import drain assembly comprises entering water electromagnetic valve and check valve, described entering water electromagnetic valve triple valve, has a water inlet valve port, one water outlet valve port and a draining valve port, the water inlet valve port of described entering water electromagnetic valve is connected with the water inlet end of described water inlet pipe and heat exchanger respectively with the water outlet valve port, described check valve is connected with the draining valve port of entering water electromagnetic valve, and described air pump is connected with described check valve by described first passage.
7. the drainage antifreezing device of gas heater as claimed in claim 6, it is characterized in that, described outlet drain assembly comprises triple valve and drain solenoid valve, three valve ports of described triple valve connect respectively water side, outlet pipe and the second channel of heat exchanger, described drain solenoid valve has two valve ports, two valve ports of described drain solenoid valve are connecting tee valve and drainpipe respectively, and consists of described second channel by described drain solenoid valve and drainpipe.
8. a gas heater is characterized in that, comprises the drainage antifreezing device such as the described gas heater of any one in the claim 1-7 item.
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| CN2013102117246A CN103322684A (en) | 2013-05-30 | 2013-05-30 | Gas water heater and drainage freezing-preventing device thereof |
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| CN2013102117246A CN103322684A (en) | 2013-05-30 | 2013-05-30 | Gas water heater and drainage freezing-preventing device thereof |
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Cited By (12)
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| CN103591692A (en) * | 2013-10-31 | 2014-02-19 | 芜湖美的厨卫电器制造有限公司 | Gas water heater |
| CN105485372A (en) * | 2015-12-11 | 2016-04-13 | 芜湖美的厨卫电器制造有限公司 | Electronic thermostatic valve, water discharging method for electronic thermostatic valve and water heater with electronic thermostatic valve |
| CN105823221A (en) * | 2016-05-23 | 2016-08-03 | 珠海格力电器股份有限公司 | Drainage control method, device and system of water heater |
| CN106382750A (en) * | 2016-11-15 | 2017-02-08 | 芜湖艾尔达科技有限责任公司 | Drainage structure of heating water path |
| CN107062625A (en) * | 2017-05-10 | 2017-08-18 | 广东超人节能厨卫电器有限公司 | A kind of anti-freeze type water heater |
| CN107842992A (en) * | 2017-12-12 | 2018-03-27 | 成都前锋电子有限责任公司 | A kind of gas heater with antifreeze function |
| CN107869836A (en) * | 2017-12-12 | 2018-04-03 | 成都前锋电子有限责任公司 | A kind of gas heater of the long-range antifreeze prompt facility of band |
| CN108224782A (en) * | 2018-03-22 | 2018-06-29 | 王智勇 | A kind of Auto-drainage frost-cracking-preventing water heater |
| CN111006398A (en) * | 2019-12-20 | 2020-04-14 | 袁芳革 | Instant-heating and instant-using water heater |
| CN111351226A (en) * | 2018-12-24 | 2020-06-30 | 台州旭升卫浴有限公司 | Low-temperature automatic water drainage switch valve of water heater |
| CN111473519A (en) * | 2019-01-24 | 2020-07-31 | 宁波方太厨具有限公司 | Water flow type anti-freezing device and application thereof |
| CN113981873A (en) * | 2020-07-27 | 2022-01-28 | 河南森源重工有限公司 | Washing and sweeping vehicle and drainage pipe cleaning method thereof |
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| CN105485372A (en) * | 2015-12-11 | 2016-04-13 | 芜湖美的厨卫电器制造有限公司 | Electronic thermostatic valve, water discharging method for electronic thermostatic valve and water heater with electronic thermostatic valve |
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| CN107062625A (en) * | 2017-05-10 | 2017-08-18 | 广东超人节能厨卫电器有限公司 | A kind of anti-freeze type water heater |
| CN107842992A (en) * | 2017-12-12 | 2018-03-27 | 成都前锋电子有限责任公司 | A kind of gas heater with antifreeze function |
| CN107869836A (en) * | 2017-12-12 | 2018-04-03 | 成都前锋电子有限责任公司 | A kind of gas heater of the long-range antifreeze prompt facility of band |
| CN108224782A (en) * | 2018-03-22 | 2018-06-29 | 王智勇 | A kind of Auto-drainage frost-cracking-preventing water heater |
| CN111351226A (en) * | 2018-12-24 | 2020-06-30 | 台州旭升卫浴有限公司 | Low-temperature automatic water drainage switch valve of water heater |
| CN111351226B (en) * | 2018-12-24 | 2024-04-09 | 台州旭升卫浴有限公司 | Low-temperature automatic water-discharging switch valve of water heater |
| CN111473519A (en) * | 2019-01-24 | 2020-07-31 | 宁波方太厨具有限公司 | Water flow type anti-freezing device and application thereof |
| CN111473519B (en) * | 2019-01-24 | 2021-05-18 | 宁波方太厨具有限公司 | Water flow type anti-freezing device and application thereof |
| CN111006398A (en) * | 2019-12-20 | 2020-04-14 | 袁芳革 | Instant-heating and instant-using water heater |
| CN113981873A (en) * | 2020-07-27 | 2022-01-28 | 河南森源重工有限公司 | Washing and sweeping vehicle and drainage pipe cleaning method thereof |
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