CN203488245U - Expansion water tank of engine cooling system and water tank cover of expansion water tank - Google Patents
Expansion water tank of engine cooling system and water tank cover of expansion water tank Download PDFInfo
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- CN203488245U CN203488245U CN201320572876.4U CN201320572876U CN203488245U CN 203488245 U CN203488245 U CN 203488245U CN 201320572876 U CN201320572876 U CN 201320572876U CN 203488245 U CN203488245 U CN 203488245U
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- steam valve
- link
- water tank
- tank lid
- steam
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Abstract
The utility model discloses an expansion water tank of an engine cooling system and a water tank cover of the expansion water tank. The water tank cover comprises a water adding opening cover, a connecting piece arranged on the water adding opening cover and a steam valve used for discharging steam in the expansion water tank when being opened. The steam valve is connected with the connecting piece which is movably connected with the water adding opening cover in the opening and closing direction of the steam valve, so that the steam valve is driven by the connecting piece to be opened under the action of external force. The connecting piece and the steam valve can move under the action of pressure difference of air pressure and spring elasticity, the connecting piece can be driven by external force to move to drive the steam valve to move, when cooling fluid is added while an engine is shut down for a short time, the connecting piece is manually operated to open the steam valve to discharge high-temperature steam, and work staff can be prevented from being scalded.
Description
Technical field
The utility model relates to technical field of engines, particularly relates to a kind of tank lid for engine-cooling system.In addition, the utility model also relates to a kind of swelling water tank that comprises above-mentioned tank lid.
Background technique
Current engine-cooling system major part is water-cooling type cooling system, and is locking system.Swelling water tank is usually used in this kind of cooling system, for storing the cooling liquid of filling and playing equilibrium water amount and the effect of pressure.
Please refer to Fig. 1, the working principle schematic diagram that Fig. 1 is water cooling system of engine.
Cooling liquid in motor 100 is during higher than uniform temperature, and thermostat 103 is opened, and cooling liquid is driven by the water pump 102 of motor 100, the water jacket of the heating part of the motor 100 of flowing through heat absorption, and temperature raises, and continues to flow into radiator 300.The cooling liquid of radiator 300 of flowing through and the air-flow of fan 200 generations carry out heat exchange, make the temperature of cooling liquid be reduced to motor 100 optimum working temperature scopes, then get back to water pump 102 entrances, continue the to flow through water jacket of motor 100 each heating parts, so circulates and forms the water circulation system of engine-cooling system.Cooling liquid in motor 100 is during lower than uniform temperature, and thermostat 103 cuts out, and the cooling liquid in motor 100 is without radiator 300, equally by self circulation that acts in motor 100 of water pump 102.
The water circulation system that above two kinds of endless form form is all called water system, because water system does not directly communicate with ambient atmosphere, is therefore called closed circulation system, and current most vehicle motors all adopt closed circulation system.In above-mentioned two kinds of endless form, when cooling liquid is not enough, all to be supplied by swelling water tank 400, and all will pass through tank lid 401 while adding inject cooling liquid.
Please refer to Fig. 2 and Fig. 3, Fig. 2 is that a kind of typical tank lid card is placed on the structural representation on swelling water tank filler, and this illustrates steam valve and by vapor pressure, is promoted the working procedure of opening; Fig. 3 is that the air register of tank lid in Fig. 2 is promoted the working procedure schematic diagram of opening by air pressure.
As Fig. 2 and Fig. 3, tank lid 401 comprises filler cap 3 ', the first link 8 ', steam shutter spring 4 ', steam valve 5 ', air register 6 ', air register spring 7 ', wherein, the first link 8 ' specifically comprises coupling shaft 81 ' and cover cap 82 '.Coupling shaft 81 ' runs through filler cap 3 ', and is fixedly connected with filler cap 3 '.Cover cap 82 ' upper end is overlapped on the step-like structure of coupling shaft 81 ', lower end is fixedly connected with steam valve 5 ', cover cap 82 ' can move along steam valve 5 ' opening direction with respect to coupling shaft 81 ', and its sidewall has through hole, and ambient air can enter water system by this through hole.Steam shutter spring 4 ' is arranged between filler cap 3 ' and steam valve 5 '.
Visible, the first link 8 ' connects steam shutter spring 4 ', steam valve 5 ', air register 6 ' and air register spring 7 ', and form a whole with filler cap 3 ', this integral body can not move relative to filler cap 3 ', is the chief component of tank lid 401.
As shown in Figure 2, when the vapor (steam) temperature in water system raises, the pressure in water system also increases thereupon, so the vapor pressure acting on steam valve 5 ' lower end surface just increases thereupon.When vapor (steam) temperature reaches the maximum water temperature of motor 100 regulations, vapor pressure will be greater than the pretightening force of steam shutter spring 4 ', steam valve 5 ' is lifted and opens under the effect of vapor pressure, cover cap 82 ' moves vertically, compressed steam shutter spring 4 ', high-temperature steam is overflowed by vent 1 '.Temperature in water system reduces gradually, and pressure also decreases, until vapor pressure is while equaling spring force, steam valve 5 ' falls closes.
As shown in Figure 3, when the vapor (steam) temperature in water system reduces, the pressure in water system also decreases, so the vapor pressure acting on steam valve 5 ' lower end surface just decreases.When vapor pressure is during lower than atmospheric pressure, atmospheric pressure just overcomes the elastic force of air register spring 7 ', air is entered by vent 1 ', and then inflow is positioned at the through hole of cover cap 82 ' sidewall, the second link 9 ' moves down vertically, open air register 6 ' air is entered in water system, balance water system external and internal pressure.When the Spring balanced of vapor pressure and air register spring 7 ', air register 6 ' is closed.
As mentioned above; although tank lid 401 can play the effect of equilibrium water amount and hydraulic pressure; but; when 100 short time of motor, shut down; the vapor pressure of water system is greater than atmospheric pressure; while being not enough to again overcome the elastic force of steam shutter spring 4 ', steam valve 5 ' will be always in closed condition with air register 6 '.If now cooling liquid liquid level is low, need to augment cooling liquid, staff turns on tank lid 401 immediately, and high-temperature steam will overflow, and there is certain potential safety hazard in the staff that likely burns.If a period of times such as staff add inject cooling liquid after water temperature declines again, will affect the normal use of vehicle.
Therefore, how in the motor short time, shutting down, while adding inject cooling liquid, avoid staff to be burnt by the high-temperature steam in water system, is the current technical issues that need to address of those skilled in the art.
Model utility content
The purpose of this utility model is to provide a kind of tank lid, can shut down in the motor short time, while adding inject cooling liquid, makes staff avoid being burnt by the high-temperature steam in water system.Another object of the present utility model is to provide a kind of swelling water tank that comprises above-mentioned tank lid, for engine-cooling system.
For solving the problems of the technologies described above, the utility model provides a kind of tank lid, swelling water tank for engine-cooling system, described tank lid comprises filler cap, is arranged at the link of described filler cap, and the steam valve of discharging steam in swelling water tank while opening, described steam valve is connected with described link, and described link is flexibly connected with the keying direction of described filler cap along described steam valve, so that described link externally drives described steam valve to open under power effect.
Preferably, described link is plugged in described filler cap along the keying direction of described steam valve.
Preferably, also comprise handle, described link is connected with described handle, and described handle drives described link to move along the keying direction of described steam valve.
Preferably, described handle and described link are hinged, and described handle rotates to drive described link to open or close described steam valve around hinge axes.
Preferably, described link is fixedly connected with described handle.
Preferably, described link is threaded with described filler cap, with the keying direction along described steam valve, relative to described filler cap spiral, moves.
Preferably, also comprise the rotating handles that drives described link rotation.
Preferably, the cover cap that described link comprises coupling shaft and is positioned at swelling water tank, described coupling shaft is connected in described filler cap, and described coupling shaft is plugged in described cover cap, described cover cap is fixedly connected with described steam valve, and described cover cap can be mounted on the end of described coupling shaft.
The tank lid that the utility model provides, its link and steam valve not only can move under the differential pressure action of gas pressure and spring force, externally under the effect of power, drive link to move to drive steam valve to move, thereby make staff can according to actual needs steam valve be placed in to the state of opening or closing.
When needs are when adding inject cooling liquid in swelling water tank, if having undischarged high-temperature steam in water tank, staff now operates very easily and is burnt by high-temperature steam.The tank lid providing for the utility model; thereby staff can be dynamically connected by the effect pioneer of external force, part moves and opens steam valve; discharge high-temperature steam; and then the case lid of fetching boiling water adds water operation; visible; the tank lid of this structure can either guarantee to add completing smoothly of water operation, and contributes to protect operator.
A kind of preferred embodiment in, the handle being connected with link can be set, staff can this handle of direct control moves to drive link to open and close direction along steam valve, and then drives steam valve to open, and completes the discharge of high-temperature steam.Compared to direct manipulation link, obviously, the manipulation that handle is set is easier, laborsaving.
The utility model also provides a kind of swelling water tank of engine-cooling system, comprises vent and filler, also comprises any tank lid as mentioned above of filler described in capping.
Because above-mentioned tank lid has above-mentioned technique effect, the swelling water tank with this tank lid also has identical technique effect.
Accompanying drawing explanation
Fig. 1 is the working principle schematic diagram of water cooling system of engine;
Fig. 2 is that a kind of typical tank lid card is placed on the structural representation on swelling water tank filler, and this illustrates steam valve and by vapor pressure, is promoted the working procedure of opening;
Fig. 3 is that the air register of tank lid in Fig. 2 is promoted the working procedure schematic diagram of opening by air pressure;
Fig. 4 is the schematic diagram of a kind of embodiment of tank lid provided by the utility model, and this illustrates air register and by air pressure, is promoted the working procedure of opening;
Fig. 5 is that in Fig. 4 mode of execution, steam valve is promoted the working procedure schematic diagram of opening by vapor pressure;
Fig. 6 is that in Fig. 4 mode of execution, steam valve is promoted the working procedure schematic diagram of opening by external force.
In Fig. 1:
100 motors, 102 valves, 103 thermostats, 200 fans, 300 radiators, 400 swelling water tanks, 401 tank lid;
In Fig. 2-3:
1 ' vent, 2 ' filler, 3 ' filler cap, 4 ' steam shutter spring, 5 ' steam valve, 6 ' air register, 7 ' air register spring, the 8 ' first link, 81 ' coupling shaft, 82 ' cover cap, the 9 ' second link, 401 tank lid;
In Fig. 4-6:
2 filler, 3 filler caps, 4 steam shutter springs, 5 steam valve, 6 air registers, 7 air register springs, 8 links, 81 coupling shafts, 82 cover caps, 10 handles, 101 left surfaces.
Embodiment
Core of the present utility model is to provide a kind of tank lid, and in the using process of engine-cooling system, when needs are when adding cooling liquid in swelling water tank, its high-temperature steam that can avoid staff to be inflated in water tank is burnt.Another core of the present utility model is to provide a kind of swelling water tank that comprises the engine-cooling system of above-mentioned tank lid.
In order to make those skilled in the art person understand better the utility model scheme, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to Fig. 4 and Fig. 5, Fig. 4 is the schematic diagram of a kind of embodiment of tank lid provided by the utility model, and this illustrates air register and by air pressure, is promoted the working procedure of opening.Fig. 5 is that in Fig. 4 mode of execution, steam valve is promoted the working procedure schematic diagram of opening by vapor pressure.
As shown in Fig. 4 and Fig. 5, in a kind of embodiment, the tank lid that the utility model embodiment provides has filler cap 3, link 8 and the steam valve 5 of capping filler 2.The concrete structure of link 8 can be similar with background technique, comprises coupling shaft 81 and cover cap 82.
Particularly, coupling shaft 81 runs through filler cap 3, and cover cap 82 is positioned at filler 2, and can along steam valve 5 keying directions, move relative to coupling shaft 81, and cover cap 82 is fixedly connected with steam valve 5, steam valve 5 and cover cap 82 synchronizing movings; In addition, cover cap 82 can be overlapped on the end of coupling shaft 81, so that steam valve 5 is maintained in its closed position.Such structure is convenient to the critical components such as integrated operation steam shutter spring 4 and steam valve 5, simple in structure, easy to use.
As shown in Figure 4, the vapor pressure in swelling water tank is during lower than atmospheric pressure, and atmospheric pressure overcomes the elastic force of air register spring 7, promotes air register 6 and opens, and air enters in swelling water tank.As shown in Figure 5, the gas pressure in swelling water tank is during higher than the pretightening force of steam shutter spring 4, and gas pressure promotes steam valve 5 and opens, and steam valve 5 moves on synchronizeing with the cover cap 82 of link 8, high-temperature steam discharge.
Now, link 8 not only can move with steam valve 5 under the differential pressure action of vapor pressure and spring force, be able to be improvedly, the mode being flexibly connected with filler cap 3 due to link 8, externally under the effect of power, drive link 8 to move to drive steam valve 5 to move, thereby make staff can according to actual needs steam valve 5 be placed in to the state of opening or closing.
When needs are when adding inject cooling liquid in swelling water tank, if having undischarged high-temperature steam in water tank, staff now operates very easily and is burnt by high-temperature steam.Tank lid for the present embodiment; thereby staff can be dynamically connected by the effect pioneer of external force, part 8 moves and opens steam valve 5; discharge high-temperature steam; and then the case lid of fetching boiling water adds water operation; visible; the tank lid of this structure can either guarantee to add completing smoothly of water operation, and contributes to protect operator.
As mentioned above, the coupling shaft 81 of link 8 can the keying direction along steam valve 5 move with respect to filler cap 3, can realize this object by multiple Placement.
Such as, in filler cap 3, a through hole being set, the coupling shaft 81 of link 8 is plugged in filler cap 3 by this through hole along the keying direction of steam valve 5, is appreciated that the mobile range of coupling shaft 81 should be enough to make steam valve 5 open or close.Described through hole can be arranged at filler cap 3 centers, can certainly be arranged at other arbitrary positions, still, if through hole is arranged to filler cap 3 centers, stressed even when steam valve 5 is driven, thus convenient operation.Coupling shaft 81 is plugged in the movable connection method of filler cap 3, is convenient to realize whole link 8 and relatively adds water cover 3 and move up in the keying side of steam valve 5.
Can do further improvement to above-mentioned tank lid, for this reason, the handle 10 being connected with the coupling shaft 81 of link 8 can be set, staff can move to drive link 8 to open and close direction along steam valve 5 by this handle 10 of direct control, and then drive steam valve 5 to open, complete the discharge of high-temperature steam.Compared to direct control coupling shaft 81, obviously, handle 10 be arranged so that operation is more simple, laborsaving.
In addition, while not being subject to External Force Acting, handle 10 can also make coupling shaft 81 can be positioned on filler cap 3, guarantees that steam valve 5 can normally open and close under differential pressure action.Certainly, it is also feasible that handle 10 is not set, such as, the top of coupling shaft 81 processes block, to block, hangs on filler cap 3, and the axle 81 that also can be located by connecting when removing external force, while needing artificial exhaust steam, directly lifts coupling shaft 81.
The Placement of coupling shaft 81 and handle 10 can have multiple, as long as can meet by operating grip 10, drives coupling shafts 81 to move along steam valve 5 keying directions, all can be used as a kind of mode of execution of the present utility model.
Please refer to Fig. 6, Fig. 6 is that in Fig. 4 mode of execution, steam valve is promoted the working procedure schematic diagram of opening by external force.
As shown in Figure 6, in this embodiment, handle 10 is hinged with link 8, and handle 10 can rotate around hinge axes, and in the process of handle 10 rotations, steam valve 5 can be opened or close.In Fig. 6, when handle 10 is rotated counterclockwise after several angle, steam valve 5 also moves a certain distance and opens along opening direction thereupon, and now high-temperature steam can be discharged.
It is pointed out that handle 10 herein rotates to open the angular dimension of steam valve 5, according to the different and difference to some extent of handle 10 shapes.Especially, can be by the shape of design handle 10 rounded ends, so that it can drive link 8 to move while rotating.Take Fig. 5 as visual angle, open the object of steam valve 5 for realizing handle 10, when handle 10 is during in level, articulating point to the distance of rounded end lower end surface is less than articulating point to the distance of rounded end left surface 101.So, as shown in Figure 6, when handle 10 is when level rotates counterclockwise, articulating point to the distance of filler cap 3 upper-end surfaces increases gradually, on link 8, moves and drives steam valve 5 to open; While rotating backward to level, link 8 drives steam valve 5 to move down again.
In present embodiment, the rounded end specific design of handle 10 is oblique square head structure, and as shown in Figure 5, rounded end left surface 101 comprises the vertical plane joining and transits to the inclined-plane of its horizontal lower end surface.When handle 10 is rotated counterclockwise 90 while spending, steam valve 5 is raised to maximum height.
Because handle 10 rounded ends have constant slope, along with angle of swing increases gradually, drive the amplitude that steam valve 5 moves also to increase gradually, and then control the steam velocity of discharge and discharge capacity.And in inclined-plane and Fig. 5, the lower end surface of rounded end can arc-shaped transition, so that the smooth rotation of handle 10.In addition, its left surface 101 comprises the vertical plane in Fig. 5, and operator are rotated counterclockwise handle 10 after 90 degree, and the vertical side of rounded end is changed the lower end surface of level into, thereby but self be resisted against filler cap 3, be convenient to steam valve 5 location.
Certainly, the end surface shape of handle 10 is not limited only to as mentioned above, as long as while not opening steam valve 5, articulating point to the distance of rounded end lower end surface is less than articulating point to the distance of handle side.Such as, in Fig. 5, its left surface is vertical plane, or rounded end integral body is that cam structure, long-round-shape structure etc. are also fine.
In the above-described embodiment, handle 10 adopts articulated manner to be connected with link 8, obviously can also connect by other means.
Such as, handle 10 is fixedly connected with link 8, and now, staff can directly lift or transfer handle 10, so that link 8 drives steam valve 5 open or close.Handle 10 is only done upper and lower parallel, and without rotation, is applicable to the limited occasion of tank lid top manipulation space.
Certainly, handle 10 is not limited only to be fixedly connected with the Placement of link 8 or is hinged, as long as can realize handle 10, drives link 8 to open steam valve 5, can think a kind of mode of execution of the present utility model.
As described above, the coupling shaft 81 of link 8 is plugged in filler cap 3, to realize link 8, is flexibly connected along steam valve 5 keying directions with tank lid 3.Obviously, can also realize by other means this object.
Such as, link 8 is through filler cap 3, and be threaded with filler cap 3.By the sense of rotation rotary connector 8 along screw thread, make link 8 screw out gradually or screw in filler cap 3, and then drive steam valve 5 to open and close.Adopt in this way, can finely tune the distance that coupling shaft 81 screws out tank lid, and then the openings of sizes of fine setting steam valve 5, to control steam discharge capacity.
As further improvement, the rotating handles that drives coupling shaft 81 to rotate now can also be set on coupling shaft 81.This rotating handles is set has increased the operating flexibility of coupling shaft 81, and staff gets final product control connection axle 81 by this handle of rotation, and then controls the keying of steam valve 5.
In above-described embodiment, link 8 be take and comprised that coupling shaft 81 and cover cap 82 carry out exemplary illustration as example.Steam valve 5 is appreciated that link 8 is not limited to this structure, as long as can either, at pressure reduction, also can open and close direction along it and move under link 8 External Force Actings.Such as, coupling shaft 81 replaces with sleeve-like configuration, and cover cap 82 replaces with the axle shape structure being plugged in sleeve, processes radially boss on the top of axle shape structure, the bottom of sleeve processes step, and radially boss can be overlapped on step, is also feasible.Those skilled in the art can make various deformation design according to this principle.
The swelling water tank of the engine cooling water system that the utility model provides, comprises the described tank lid of above-mentioned each specific embodiment; Other parts can, with reference to prior art, no longer be launched herein.
Above the swelling water tank of engine cooling water system provided by the utility model and tank lid thereof are described in detail.Applied specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present utility model and core concept thereof.Should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (9)
1. a tank lid, swelling water tank for engine-cooling system, described tank lid comprises filler cap (3), is arranged at the link (8) of described filler cap (3), and the steam valve (5) of discharging steam in swelling water tank while opening, described steam valve (5) is connected with described link (8), it is characterized in that, described link (8) is flexibly connected with the keying direction of described filler cap (3) along described steam valve (5), so that described link (8) externally drives described steam valve (5) to open under power effect.
2. tank lid as claimed in claim 1, is characterized in that, described link (8) is plugged in described filler cap (3) along the keying direction of described steam valve (5).
3. tank lid as claimed in claim 2, it is characterized in that, also comprise handle (10), described link (8) is connected with described handle (10), and described handle (10) drives described link (8) to move along the keying direction of described steam valve (5).
4. tank lid as claimed in claim 3, it is characterized in that, described handle (10) is hinged with described link (8), and described handle (10) rotates to drive described link (8) to open or close described steam valve (5) around hinge axes.
5. tank lid as claimed in claim 3, is characterized in that, described link (8) is fixedly connected with described handle (10).
6. tank lid as claimed in claim 1, is characterized in that, described link (8) is threaded with described filler cap (3), with the keying direction along described steam valve (5), relative to described filler cap (3) spiral, moves.
7. tank lid as claimed in claim 6, is characterized in that, also comprises the rotating handles that drives described link (8) rotation.
8. the tank lid as described in claim 1-7 any one, it is characterized in that, the cover cap (82) that described link (8) comprises coupling shaft (81) and is positioned at swelling water tank, described coupling shaft (81) is connected in described filler cap (3), and described coupling shaft (81) is plugged in described cover cap (82), described cover cap (82) is fixedly connected with described steam valve (5), and described cover cap (82) can be mounted on the end of described coupling shaft (81).
9. a swelling water tank for engine-cooling system, comprises vent (1) and filler (2), it is characterized in that, also comprises the tank lid as described in claim 1 to 8 any one of filler (2) described in capping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320572876.4U CN203488245U (en) | 2013-09-16 | 2013-09-16 | Expansion water tank of engine cooling system and water tank cover of expansion water tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320572876.4U CN203488245U (en) | 2013-09-16 | 2013-09-16 | Expansion water tank of engine cooling system and water tank cover of expansion water tank |
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| Publication Number | Publication Date |
|---|---|
| CN203488245U true CN203488245U (en) | 2014-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320572876.4U Expired - Fee Related CN203488245U (en) | 2013-09-16 | 2013-09-16 | Expansion water tank of engine cooling system and water tank cover of expansion water tank |
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| Country | Link |
|---|---|
| CN (1) | CN203488245U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234816A (en) * | 2014-08-04 | 2014-12-24 | 杭叉集团股份有限公司 | Gas-removing type expansion water tank for internal-combustion forklift |
| CN107387228A (en) * | 2017-09-11 | 2017-11-24 | 张家港保税区通勤精密机械有限公司 | A kind of adaptive engine tank pressure lid |
| CN107701292A (en) * | 2017-11-17 | 2018-02-16 | 吉林大学 | A kind of expansion water tank cover, expansion tank and its control method of the anti-scald in engine high-temperature |
-
2013
- 2013-09-16 CN CN201320572876.4U patent/CN203488245U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234816A (en) * | 2014-08-04 | 2014-12-24 | 杭叉集团股份有限公司 | Gas-removing type expansion water tank for internal-combustion forklift |
| CN104234816B (en) * | 2014-08-04 | 2017-10-13 | 杭叉集团股份有限公司 | Diesel fork lift truck degassing type expansion tank |
| CN107387228A (en) * | 2017-09-11 | 2017-11-24 | 张家港保税区通勤精密机械有限公司 | A kind of adaptive engine tank pressure lid |
| CN107701292A (en) * | 2017-11-17 | 2018-02-16 | 吉林大学 | A kind of expansion water tank cover, expansion tank and its control method of the anti-scald in engine high-temperature |
| CN107701292B (en) * | 2017-11-17 | 2023-07-11 | 吉林大学 | Anti-scalding expansion water tank cover at high temperature of engine, expansion water tank and control method thereof |
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Granted publication date: 20140319 Termination date: 20200916 |