CN111102376B - Control valve for gas water heater and gas water heater - Google Patents

Control valve for gas water heater and gas water heater Download PDF

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Publication number
CN111102376B
CN111102376B CN201811261571.5A CN201811261571A CN111102376B CN 111102376 B CN111102376 B CN 111102376B CN 201811261571 A CN201811261571 A CN 201811261571A CN 111102376 B CN111102376 B CN 111102376B
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valve
water
cavity
water heater
channel
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CN111102376A (en
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黄启彬
周高云
刘筱倩
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Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel

Abstract

The invention relates to a control valve for a gas water heater and the gas water heater, comprising a valve body and a valve core, wherein a water flow channel running through the valve body is arranged in the valve body, and the valve core divides the water flow channel into a water inlet channel positioned at the upstream and a water outlet channel positioned at the downstream; the water flow valve is characterized in that a valve cavity communicated with the water flow channel in a cross way is also arranged in the valve body; the valve cavity comprises a left cavity, a right cavity and a middle cavity connected between the left cavity and the right cavity; the valve core is limited in the middle cavity and can move in the middle cavity in a reciprocating mode so as to open or close the water flow channel; the sectional area of the left cavity facing the valve core is smaller than that of the right cavity facing the valve core; and a first bypass communicated with the left cavity and the water inlet channel and a second bypass communicated with the right cavity and the water outlet channel are further arranged in the valve body.

Description

Control valve for gas water heater and gas water heater
Technical Field
The invention relates to a gas water heater, in particular to a control valve used on a water inlet pipeline of the gas water heater and the gas water heater using the control valve.
Background
In high-rise housing, situations often arise where the water pressure for the user is not stable. The water pressure is unstable, and the water flow rate is suddenly large or small as a result. When the water heater is used, the constant temperature performance of the water heater is limited, so that the phenomenon that the water temperature is suddenly cooled and suddenly heated often occurs, and the comfort of bathing is seriously influenced.
Moreover, the start-up conditions of prior art gas water heaters are all monitored by monitoring the flow of water through the water heater. When the flow reaches the water heater starting design value, the gas water heater starts to start the fan to carry out the front cleaning working state. However, the pipelines in the household are complex, pressure fluctuation exists in the pipelines when water using process or water using is finished, water flows out and flows into the water heater when hot water using is not needed due to the pressure fluctuation, and when the abnormal water flow reaches the starting flow of the water heater, a fan can be in a cleaning state before starting, so that the abnormal starting of the water heater is caused. This is often referred to as a water heater self-start.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control valve for a gas water heater, which can be automatically opened and closed so as to open or close a water inlet pipeline, aiming at the current situation of the prior art, so as to avoid the self-starting phenomenon of the gas water heater.
Another technical problem to be solved by the present invention is to provide a gas water heater capable of avoiding self-starting and effectively suppressing fluctuation of water outlet flow to obtain a more stable water outlet effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: a control valve for a gas water heater comprises a valve body and a valve core, wherein a water flow channel penetrating through the valve body is arranged in the valve body, and the valve core divides the water flow channel into a water inlet channel positioned at the upstream and a water outlet channel positioned at the downstream; the water flow valve is characterized in that a valve cavity communicated with the water flow channel in a cross way is also arranged in the valve body;
the valve cavity comprises a left cavity, a right cavity and a middle cavity connected between the left cavity and the right cavity;
the valve core is limited in the middle cavity and can move in the middle cavity in a reciprocating mode so as to open or close the water flow channel; the sectional area of the left cavity facing the valve core is smaller than that of the right cavity facing the valve core;
and a first bypass communicated with the left cavity and the water inlet channel and a second bypass communicated with the right cavity and the water outlet channel are further arranged in the valve body.
In order to make the action of the valve core more stable and controllable, a left valve plug capable of blocking the left cavity can be slidably arranged in the left cavity, and a right valve plug capable of blocking the right cavity can be slidably arranged in the right cavity; the valve core is connected with the left valve plug and the right valve plug through a valve rod;
the first bypass is communicated with a left cavity part on the left side of the left valve plug; the second bypass communicates with a right chamber portion to the right of the right valve plug.
Preferably, the second bypass is a damping channel. The second bypass is designed into a damping channel, so that the valve core can be effectively prevented from moving rightwards quickly, and the self-starting phenomenon of the water heater caused by the quick opening of the valve core when the water inlet pressure is increased suddenly is avoided; and a certain compensation effect is provided for the starting flow of the water heater by reducing the moving speed of the valve core.
In order to make the water flow smoothly, the water outlet channel can comprise a large pipe and a throat pipe; the pipe diameter of the pipe diameter water inlet channel of the large pipe is matched with that of the large pipe, and the pipe diameter of the throat pipe is smaller than that of the large pipe. The large pipe and the throat pipe can be in chamfer transition, smooth transition or right-angle transition; preferably chamfered and rounded transitions.
As a further improvement of the above aspects, a preferable control valve for a gas water heater satisfies the following conditions:
Figure BDA0001843992010000021
wherein, P1maxThe maximum water inlet pressure is obtained;
Qminthe minimum starting flow of the installed water heater;
a1 is the cross-sectional area of the left cavity;
a2 is the cross-sectional area of the right cavity;
ρ is the density of water.
For domestic gas water heaters, normally, the P1max0.5 to 0.8 MPa; qminIs 1.5 to 2.5L/min.
In each of the above solutions, preferably, the valve cavity is a step-shaped buried hole, and an axis of the valve cavity is perpendicular to an axis of the water flow passage.
The gas water heater using the control valve for the gas water heater in each scheme is characterized in that the water inlet channel and the water outlet channel on the control valve are connected to a water inlet pipe of the water heater;
the water inlet pipe is also connected with an expansion water tank through a third bypass; the expansion tank is located downstream of the control valve.
The water inlet pipe is also provided with a flow sensor for monitoring the water flow in the water inlet pipe; the flow sensor is located downstream of the expansion tank.
Compared with the prior art, the control valve provided by the invention controls the action of the valve core through the angular force of the inlet and outlet pressure acting between the two valve plugs, so that the valve is completely opened when water is used and completely closed when water is not used, and the self-starting phenomenon of the water heater is effectively avoided; the gas water heater using the control valve is matched with the expansion water tank, so that the self-starting phenomenon of the gas water heater can be effectively avoided, the water pressure fluctuation can be alleviated, the water outlet of the water heater has a steady flow effect, the combustion of the water heater is more stable, and better water consumption experience is obtained.
Drawings
Fig. 1 is a longitudinal sectional view (water flow passage closed state) of a control valve in an embodiment of the invention;
fig. 2 is a longitudinal sectional view (water flow passage open state) of the control valve in the embodiment of the invention;
FIG. 3 is a schematic view of a water heater according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The description of the directions in this embodiment are relative relationships, and the actual product is not limited thereto.
As shown in fig. 1 to 3, the control valve used in the present embodiment includes:
the valve body 1 is provided with:
the water flow channel 11 longitudinally penetrates through the valve body 1 and is used for connecting a water inlet pipe 6 of the gas water heater, and the water flow channel 11 is divided into a water inlet channel 11a positioned at the upstream and a water outlet channel 11b positioned at the downstream by the valve core 2; the water outlet passage 11b includes a large pipe 11ba located upstream and a throat pipe 11bb located downstream of the large pipe; the pipe diameters of the water inlet channels of the large pipes are matched, and are equal in the embodiment; the pipe diameter of the throat pipe is smaller than that of the large pipe. The flow cross-sectional area of the large pipe is A3, and the flow cross-sectional area of the throat pipe is A4.
A valve cavity 12 arranged across the water flow passage 11, the valve cavity 12 in this embodiment isThe stepped bore is buried and the axis of the valve chamber is perpendicular to the axis of the water flow passage 11. The valve chamber 12 includes a left chamber 12a, a right chamber 12b, and an intermediate chamber 12c connected between the left chamber 12a and the right chamber 12 b. Sectional area A of the left chamber 12a in the present embodiment1< sectional area A of the right chamber 12b2< cross-sectional area of the intermediate chamber 12 c.
And a first bypass 13 for communicating the left chamber 12a and the water inlet passage 11 a.
And a second bypass 14 for communicating the right chamber 12b with the water outlet channel 11 b. In order to enable the valve core to be smoothly moved away from the water opening channel to the right, the second bypass 14 in the embodiment is a damping channel; the concrete structure of second bypass can choose any kind of damping channel among the prior art as required for use, and the pipeline that the pipe diameter is less is adopted for this embodiment to the interval has set up the throat that two pipe diameters shrink on the pipeline.
In this embodiment, the first bypass 13 communicates with the left chamber portion on the left side of the left valve plug; the second bypass 14 communicates with the right chamber portion to the right of the right spool.
And the valve core 2 is used for opening or closing the water flow channel, is limited and accommodated in the middle cavity 12c and can move back and forth in the middle cavity 12c so as to open or close the water flow channel 11.
The left valve plug 4 can be slidingly accommodated in the left cavity 12a and can block the left cavity to divide the left cavity into a left part and a right part; the cross-sectional area of the left valve plug 4 is equal to the cross-sectional area of the left chamber, a 1.
The right valve plug 5 can be slidably accommodated in the right cavity 12b and can block the right cavity to divide the right cavity into a left part and a right part; the sectional area of the right valve plug is equal to that of the right cavity and is A2。
The valve core 2, the left valve plug 4 and the right valve plug 5 are connected through the valve rod 3.
Set the water pressure P in the water inlet channel1Water pressure P in water outlet channel2Right chamber right water pressure P22。
In the static pressure state, the pressure at each position in the pipeline is equal to obtain P1＝P22Thus P is1A1＜P22A2. I.e. when the water heater is not working, the valve core is under the angular force of two valve plugsThe valve is in a closed state at the leftmost end under the action.
When water flows normally, the valve is completely opened, and the valve core is positioned at the rightmost end. When water flows through the throat pipe structure, the flow velocity can be increased, so that the pressure at the throat pipe is reduced; and the greater the flow rate P1And P22The greater the pressure difference value between. Therefore, when water is normally pumped, the valve core is ensured to be at the rightmost end, the water flow channel is completely opened, and under the condition of the minimum starting flow Qmin of the water heater, the flow continuous equation can know that: a. the3V3＝A4V4＝Q(1)
Therefore, it is not only easy to use
Figure BDA0001843992010000041
Figure BDA0001843992010000042
Neglecting the height difference and throttle pressure loss, from bernoulli's equation:
Figure BDA0001843992010000043
the formula (2) and the formula (3) are taken into the formula (4) to obtain:
Figure BDA0001843992010000044
in steady state P22＝P2 (6)
Requiring the valve core to be pushed to the right, then P1A1>P22A2I.e. P1A1>P2A2 (7)
Bringing formula (5) into formula (7):
Figure BDA0001843992010000045
ρ is the density of water;
due to A1Is less than A2Then (A)1-A2)<0 and large tube flow area A3Greater than the flow area A of the throat4Therefore, it is
Figure BDA0001843992010000046
Therefore, if the water pressure P is equal to the water inlet pressure1When the water flow Q is minimum, the formula (8) can be satisfied, and the valve core can be ensured to move rightwards under the condition of normal opening.
The maximum water inlet pressure is P1maxMinimum startup flow of Qmin. The control valve needs to satisfy:
Figure BDA0001843992010000051
for a conventional domestic gas water heater, the maximum water pressure P in the water circuit1maxGenerally 0.5-0.8MPa, the minimum induction flow value Q of the water heaterminGenerally 1.5-2.5L/min. The exact numerical values are substituted into a formula, and A of the water heaters which are adaptive to different specifications can be determined1、A2、A3And A4。
According to the control valve designed according to the rule, the valve is closed under the static pressure state of the waterway; when the water pressure in the pipeline upstream of the valve fluctuates, the pipeline downstream of the valve cannot be influenced. Only when water in the downstream pipeline is lost and the water pressure is reduced, the valve is automatically opened, so that the self-starting phenomenon of the gas water heater caused by the fluctuation of the water pressure in the pipeline is effectively avoided.
As shown in fig. 3, the gas water heater using the control valve connects the water inlet channel 11a and the water outlet channel 11b on the control valve to the water inlet pipe 6 of the water heater; the water inlet pipe 6 is also connected with an expansion water tank 7 through a third bypass 61; an expansion tank 7 is located downstream of the control valve.
The expansion tank can be any one of the prior arts according to the requirement.
The water inlet pipe 6 is also provided with a flow sensor 8 for monitoring the water flow in the water inlet pipe; a flow sensor 8 is located downstream of the expansion tank 7.
The system operation process comprises the following steps:
when the gas water heater is started, the valve core of the control valve is positioned at the leftmost end, as shown in fig. 1, and at the moment, the water inlet of the water heater is isolated from the water inlet pipeline.
When a user has a water demand, firstly, water in the expansion water tank flows out under the action of air pressure in the expansion water tank, and the water heater correspondingly starts to be started after the flow sensor detects that enough water flow passes through the water heater. The water pressure P inside the water heater along with the outflow of the water of the expansion tank21Drop, resulting in a water pressure P acting on the right end face of the right valve plug22Also decreases when P appears22A2＜P1A1When the water inlet valve is used, the valve core moves rightwards under the action of water inlet pressure to open the water flow channel, and water inlet and water outlet of the control valve start to be communicated. The water heater can normally discharge water. The more the pressure of the expansion tank is reduced, the more P22The smaller the flow rate of the water to be supplied to the user side is, the faster the valve opening speed of the control valve is, so that the compensation effect on the flow rate of the water to be supplied to the user side is achieved, and the condition that the user cannot generate overlarge flow fluctuation when the user starts to use the water is guaranteed.
When the spool moves to the rightmost end, as shown in fig. 2, the control valve is now fully open. This state will be maintained as the water demand from the user continues.
And after the control valve is completely opened, the water heater enters a normal running state. At this time, the expansion tank starts to play a role in stabilizing the water flow. The expansion tank has the function of buffering water pressure fluctuation due to the following reasons: when the water pressure of the pipeline is too high, the expansion water tank is in a state of absorbing water flow, so that the water flow entering the water heater is divided, and when the water pressure is increased, the water outlet quantity of the water heater is kept unchanged basically within a certain time. When the water pressure in the pipeline is too low, the expansion tank is in a drainage state, and thus, the expansion tank and the water entering the water heater are combined, so that the water yield of the water heater can be basically unchanged within a certain time even if the water pressure is reduced.
Taking an expansion water tank with the volume of 5L as an example, under the conditions that the frequency is 10s and the pressure fluctuation value is 0.043MPa-0.174MPa, the variation of the water outlet flow of the water heater is only 1L/min under the condition of pressure fluctuation. And the flow variation without using the expansion tank reaches 5L/min.
When the user closes the water tap at the water outlet end of the water heater, the water pressure at each position in the whole water channel of the water heater is slowly kept consistent with the water pressure of inlet water, namely P22＝P1. Because A is2>A1So that P is at this time22A2>P1A1. The spool moves to the left under pressure. Eventually the control valve is closed.
After the water heater is closed, if the water pressure of a front end pipeline of the water heater is suddenly increased, the water pressure in the water heater cannot be simultaneously increased, and the problem of self-starting is avoided. Because the second bypass pipeline is slender and is also provided with a plurality of damping buffer ports, even if the pressure at the water inlet end is suddenly increased a lot in the closed state, the control valve cannot be opened immediately, and the valve core only moves to the right slowly, so that the water heater cannot be started automatically.
And because the expansion tank always keeps a certain amount of water, the water stored in the expansion tank is always used before the water heater is used.

Claims (8)

1. A control valve for a gas water heater comprises a valve body (1) and a valve core (2), wherein a water flow channel (11) penetrating through the valve body (1) is arranged in the valve body (1), and the valve core (2) divides the water flow channel into a water inlet channel (11a) positioned at the upstream and a water outlet channel (11b) positioned at the downstream; the water flow valve is characterized in that a valve cavity communicated with the water flow channel in a cross way is also arranged in the valve body (1);
the valve cavity comprises a left cavity (12a), a right cavity (12b) and a middle cavity (12c) connected between the left cavity (12a) and the right cavity (12 b);
the valve core (2) is limited in the middle cavity (12c) and can move back and forth in the middle cavity (12c) so as to open or close the water flow channel; the sectional area of the left cavity (12a) facing the valve core (2) is smaller than that of the right cavity (12b) facing the valve core (2);
a first bypass (13) for communicating the left cavity (12a) with the water inlet channel (11a) and a second bypass (14) for communicating the right cavity (12b) with the water outlet channel (11b) are further arranged in the valve body (1);
the second bypass (14) is a damping channel;
the water inlet channel (11a) and the water outlet channel (11b) are connected to a water inlet pipe (6) of the water heater.
2. The control valve for the gas water heater according to claim 1, wherein the left chamber (12a) is slidably provided therein with a left valve plug (4) capable of blocking the left chamber (12a), and the right chamber (12b) is slidably provided therein with a right valve plug (5) capable of blocking the right chamber (12 b); the valve core (2) is connected with the left valve plug (4) and the right valve plug (5) through a valve rod (3);
the first bypass (13) is communicated with a left cavity part on the left side of the left valve plug; the second bypass (14) communicates with a right chamber portion to the right of the right spool.
3. The control valve for a gas water heater according to claim 1, wherein the water outlet passage (11b) includes a large pipe (11ba) and a throat pipe (11 bb); the pipe diameter of the large pipe is matched with the pipe diameter of the water inlet channel, and the pipe diameter of the throat pipe is smaller than that of the large pipe.
4. The control valve for a gas water heater according to any one of claims 1 to 3, characterized in that:
Figure 110570DEST_PATH_IMAGE002
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE003
the maximum water inlet pressure is obtained;
Figure 505780DEST_PATH_IMAGE004
the minimum starting flow of the installed water heater;
A1is the cross-sectional area of the left cavity;
A2is the cross-sectional area of the right cavity;
ρ is the density of water.
5. The control valve for a gas water heater according to claim 4, wherein the control valve is provided in a valve body of the gas water heater
Figure 257835DEST_PATH_IMAGE003
0.5 to 0.8 MPa;
Figure 80297DEST_PATH_IMAGE004
is 1.5 to 2.5L/min.
6. The control valve for a gas water heater according to claim 5, wherein the valve chamber is a stepped buried hole, and an axis of the valve chamber is perpendicular to an axis of the water flow passage.
7. Gas water heater using a control valve for gas water heater according to any of claims 1 to 6, characterized in that the inlet pipe (6) is further connected to the expansion tank (7) through a third bypass (61); the expansion tank (7) is located downstream of the control valve.
8. The gas water heater of claim 7, characterized in that the water inlet pipe (6) is further provided with a flow sensor (8) for monitoring the water flow rate in the water inlet pipe; the flow sensor (8) is located downstream of the expansion tank (7).
CN201811261571.5A 2018-10-26 2018-10-26 Control valve for gas water heater and gas water heater Active CN111102376B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174338A (en) * 1988-05-25 1992-12-29 Atsugi Motor Parts Company, Limited Pressure control valve unit
JP2001005536A (en) * 1999-06-25 2001-01-12 Aera Japan Ltd Pressure control system for exhaust system
CN1337539A (en) * 2001-09-05 2002-02-27 宁波华液机器制造有限公司 Pressure difference feedback type precontrolled slide valve
CN1554873A (en) * 2003-12-25 2004-12-15 宁波华液机器制造有限公司 Ratio pressure difference control valve
CN103827563A (en) * 2011-08-31 2014-05-28 柏佛尔德流体动力有限公司 Valve
GB2524648A (en) * 2014-03-25 2015-09-30 Hamilton Sundstrand Corp Pressure regulating valve and method of adjusting damping of the same
CN205825411U (en) * 2016-06-29 2016-12-21 广东万家乐燃气具有限公司 A kind of gas heater of band heating function

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150234392A1 (en) * 2014-02-18 2015-08-20 Mine Support Products (Pty) Ltd Pressure reduction device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174338A (en) * 1988-05-25 1992-12-29 Atsugi Motor Parts Company, Limited Pressure control valve unit
JP2001005536A (en) * 1999-06-25 2001-01-12 Aera Japan Ltd Pressure control system for exhaust system
CN1337539A (en) * 2001-09-05 2002-02-27 宁波华液机器制造有限公司 Pressure difference feedback type precontrolled slide valve
CN1554873A (en) * 2003-12-25 2004-12-15 宁波华液机器制造有限公司 Ratio pressure difference control valve
CN103827563A (en) * 2011-08-31 2014-05-28 柏佛尔德流体动力有限公司 Valve
GB2524648A (en) * 2014-03-25 2015-09-30 Hamilton Sundstrand Corp Pressure regulating valve and method of adjusting damping of the same
CN205825411U (en) * 2016-06-29 2016-12-21 广东万家乐燃气具有限公司 A kind of gas heater of band heating function

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