CN107752947A - The respirator and water tank type dish-washing machine of dish-washing machine - Google Patents
The respirator and water tank type dish-washing machine of dish-washing machine Download PDFInfo
- Publication number
- CN107752947A CN107752947A CN201711193927.1A CN201711193927A CN107752947A CN 107752947 A CN107752947 A CN 107752947A CN 201711193927 A CN201711193927 A CN 201711193927A CN 107752947 A CN107752947 A CN 107752947A
- Authority
- CN
- China
- Prior art keywords
- washing machine
- dish
- return piece
- respirator
- valve body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/0086—In-sink dishwashers
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
- A47L15/4223—Devices for water discharge, e.g. devices to prevent siphoning, non-return valves
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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a kind of respirator of dish-washing machine and water tank type dish-washing machine.The haustorium includes ventilator housing and check valve, drainage channel and even gas passage are limited in ventilator housing, drainage channel has wastewater inlet and outlet of sewer, even gas passage has drainage ventilation mouth and pneumostome, drainage ventilation mouth communicated drainage passage and between wastewater inlet and outlet of sewer, pneumostome connection ambient atmosphere.Check valve includes valve body and non-return piece, and valve body, which is located at, to be connected in gas passage and intercept between drainage ventilation mouth and pneumostome, and valve body has external tapping and inner joint, external tapping connection pneumostome, inner joint communicated drainage blow vent.Non-return piece is swingably located between external tapping and inner joint, and the respirator of dish-washing machine according to embodiments of the present invention is opened or closed the mode of pneumostome using the motion of non-return piece very reliably and stably, and service life is longer.
Description
Technical field
The present invention relates to dishwasher apparatus field, more particularly to a kind of respirator of dish-washing machine and water tank type dish-washing machine.
Background technology
In correlation technique, the check valve assembly structure in respirator is excessively simple, and balance pressure difference ability is poor.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art.Therefore, the present invention proposes that one kind is washed
The respirator of bowl machine, the balance pressure difference ability of the respirator is stronger, and can balance pressure difference relatively stablely.
The present invention, which also aims to, proposes a kind of water tank type dish-washing machine of the respirator with the dish-washing machine.
The respirator of dish-washing machine according to embodiments of the present invention, including:Ventilator housing, the ventilator housing is interior to be limited
Go out drainage channel and even gas passage, the drainage channel has wastewater inlet and outlet of sewer, and the even gas passage has draining
Blow vent and pneumostome, the drainage ventilation mouth connect the drainage channel and are located at the wastewater inlet and the outlet of sewer
Between, the pneumostome connects ambient atmosphere;Check valve, the check valve include:Valve body, the valve body are located at the even gas and led to
In road and intercept between the drainage ventilation mouth and the pneumostome, the valve body has external tapping and inner joint, described outer
Pneumostome described in orifice, the inner joint communicated drainage blow vent;Non-return piece, the non-return piece are swingably located at described
Between external tapping and the inner joint, the non-return piece has open position and closed position, the non-return at closed position
Piece stops in the side wall for the setting external tapping for being against the valve body and the closure external tapping, the non-return at open position
Piece stops in the side wall for the setting inner joint for being against the valve body and forms air gap between the inner joint with ventilating air.
The respirator of dish-washing machine according to embodiments of the present invention, due to opening or closing connection and exhale being even provided with gas passage
The non-return piece of the external tapping of suction inlet, when can preferably ensure dish-washing machine proper drainage, sewage is exhaled without going past pneumostome discharge
Haustorium, and can balance the pressure difference in drainage channel, prevent the phenomenon that flowing back occurs in the sewage in drainage channel from occurring.It is in addition, sharp
The mode of pneumostome is opened or closed with the motion of non-return piece very reliably and stably, and service life is longer.
In certain embodiments, the valve body has the first land set around the pneumostome, at closed position
The non-return piece is fitted on the end face of first land.
In certain embodiments, the valve body has the second land set around the drainage ventilation mouth, in open position
The non-return piece is only against in second land when putting, and is formed between the end face of the non-return piece and second land sharp
Angle.
In certain embodiments, the non-return piece includes:Axis body, swing rod and valve block, the axis body and the valve block are located at
The both ends of the swing rod, the valve body is interior to be provided with the axial trough for being used for accommodating the axis body, and the valve block is used for and the external tapping
It is engaged.
Specifically, the axis body is formed as cuboid, and the axial trough is formed as the shape being adapted with the shape of the axis body
Shape, and the axial trough is more than the sectional dimension of the axis body in the sectional dimension on axis of oscillation direction.
In certain embodiments, the external tapping is located on the roof of the valve body, and the inner joint is arranged on the valve
On the bottom wall of body, the non-return piece is swung along the vertical direction.
In certain embodiments, the core on the surface of the direction external tapping of the non-return piece be formed as plane,
Marginal portion is formed towards the cambered surface that the direction away from the external tapping extends.
In certain embodiments, the valve body is formed on the inwall for connecting gas passage.
Water tank type dish-washing machine according to embodiments of the present invention, include the respirator of described dish-washing machine.
Water tank type dish-washing machine according to embodiments of the present invention, due to can preferably ensure provided with previously described respirator
During dish-washing machine proper drainage, sewage discharges respirator without going past pneumostome, and and can balances the pressure difference in drainage channel, the row of preventing
The phenomenon that flowing back occurs in sewage in aquaporin occurs.In addition, the reliability of respirator is preferable, the check valve practicality longevity of respirator
Life is longer.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein:
Fig. 1 is the overall structure figure of the respirator of the dish-washing machine of the embodiment of the present invention.
Fig. 2 is that Fig. 1 circles show zoomed-in view at A.
Fig. 3 is the partial structural diagram for the respirator that the check valve of the embodiment of the present invention is closed.
Fig. 4 is the partial structural diagram that the check valve of the embodiment of the present invention is in the respirator of open mode.
Reference:
Respirator 100,
Ventilator housing 10,
Drainage channel 110, wastewater inlet 111, outlet of sewer 112,
Even gas passage 120, drainage ventilation mouth 121, pneumostome 122,
Check valve 20
Valve body 210, inner joint 213, external tapping 214, the first land 215, the second land 216, axial trough 217, non-return piece
220th, axis body 222, swing rod 223, valve block 224.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.In addition, limit
Surely there is " first ", one or more this feature can be expressed or be implicitly included to the feature of " second ".The present invention's
In description, unless otherwise indicated, " multiple " are meant that two or more.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected;Can
To be mechanical connection or electrical connection;Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
The concrete structure of the respirator 100 of dish-washing machine according to embodiments of the present invention is described below with reference to Fig. 1-Fig. 4.
As shown in figure 1, the respirator 100 of dish-washing machine according to embodiments of the present invention includes ventilator housing 10 and check valve
20, drainage channel 110 and even gas passage 120 are limited in ventilator housing 10, drainage channel 110 has the He of wastewater inlet 111
Outlet of sewer 112, connecting gas passage 120 has drainage ventilation mouth 121 and pneumostome 122, the communicated drainage passage of drainage ventilation mouth 121
110 and between wastewater inlet 111 and outlet of sewer 112, pneumostome 122 connects ambient atmosphere.
As shown in Fig. 2 check valve 20 includes valve body 210 and non-return piece 220, the company's of the being located at gas passage 120 of valve body 210 is interior and stifled
Cut between drainage ventilation mouth 121 and pneumostome 122, valve body 210 has external tapping 214 and inner joint 213, and external tapping 214 connects
Logical pneumostome 122, the communicated drainage blow vent 121 of inner joint 213.Non-return piece 220 is swingably located at external tapping 214 and inner joint
Between 213, non-return piece 220 has open position and closed position, and at closed position, non-return piece 220 is only against valve body 210
Set in the side wall of external tapping 214 and block external tapping 214 (as shown in Figure 3), non-return piece 220 is only against valve at open position
Air gap is formed with ventilating air (as shown in Figure 4) in the side wall of the setting inner joint 213 of body 210 and between inner joint 213.
It should be noted that the wastewater inlet 111 of respirator 100 connects with the washing cavities of dish-washing machine, outlet of sewer 112 is suitable
In with water passage, drainage ventilation mouth 121 and atmosphere.The drainage procedure of water tank type dish-washing machine is:Produced in washing cavities
Wash water by wastewater inlet 111 enter drainage channel 110 in, then drained into by outlet of sewer 112 in sewer, from
And realize the drainage procedure of water basin dish-washing machine.When stopping drainage procedure, will be formed in the Upstream section of drainage channel 110 negative
Pressure so that there is the trend to be flowed back by siphon with the water being detained in the tract of the drainage channel 110 of water passage, due to
Drainage ventilation mouth 121 and atmosphere, the air in air can be entered in drainage channel 110 by drainage ventilation mouth 121, with
Balance drainage channel 110 in pressure difference, prevent drainage channel 110 from siphonage occur, after thus it can be prevented that draining draining lead to
Current in road 110 are back in the washing cavities of water basin dish-washing machine, and the water for ensureing to be detained in drainage channel 110 is smoothly discharged.
It is understood that during dish-washing machine proper drainage, sewage can produce shunting after entering drainage channel 110,
A part of sewage flows to outlet of sewer 112 and discharged, and another part will enter even gas passage 120.When water level constantly rises and connect
When contacting non-return piece 220, due to buoyancy, non-return piece 220 can close the external tapping 214 of valve body 210 so that sewage can not
Flowed out to from external tapping 214 at pneumostome 122.Hereby it is achieved that during dish-washing machine proper drainage, sewage is without going past pneumostome
122 discharge respirators 100.In addition, using non-return piece 220 close external tapping 214 mode prevent sewage from spilling, reliability compared with
Height, stability are preferable.
When there is negative pressure in the upstream of drainage channel 110, because the air pressure in drainage channel 110 is less than external atmosphere pressure,
Therefore, fallen after rise in the presence of external pressure and the self gravitation of non-return piece 220 so that non-return piece 220 is only against setting for valve body 210
Put in the side wall of inner joint 213, and be formed as air gap between inner joint 213 with ventilating air.Hereby it is achieved that balance row
Pressure difference in aquaporin 110, prevent the phenomenon that flowing back occurs in the sewage in drainage channel 110 from occurring.
The respirator 100 of dish-washing machine according to embodiments of the present invention, due to being opened or closed in interior be provided with of even gas passage 120
The non-return piece 220 of the external tapping 214 of pneumostome 122 is connected, when can preferably ensure dish-washing machine proper drainage, sewage will not be through
Cross pneumostome 122 and discharge respirator 100, and can balances the pressure difference in drainage channel 110, prevents the sewage in drainage channel 110
The phenomenon for occurring flowing back occurs.In addition, the mode for being opened or being closed pneumostome 122 using the motion of non-return piece 220 very may be used
Lean on and stably, and service life is longer.
In certain embodiments, valve body 210 has the first land 215 set around pneumostome 122, at closed position
Non-return piece 220 is fitted on the end face of the first land 215.It is understood that if non-return piece 220 is direct at closed position
It is fitted at pneumostome 122, then be likely to occur and be bonded phenomenon that is not tight and causing sewage directly to be spilt from pneumostome 122.Cause
This circular pneumostome 122, which is provided with the first land 215, can play certain cushioning effect, ensure that sewage will not be from pneumostome
122 outflows.
In certain embodiments, as shown in figure 4, valve body 210 has the second land set around drainage ventilation mouth 121
216, at open position non-return piece 220 only be against in the second land 216, and the end face of the land 216 of non-return piece 220 and second it
Between form acute angle.Thus, you can realize that non-return piece 220 was both only against in the side wall of inner joint 213, and can and inner joint 213
Air gap be present in side wall.
It should be noted that the form for being formed as acute angle between the end face of the land 216 of non-return piece 220 and second have it is a variety of,
For example, there is difference in height in the end face of the second land 216, in radially opposite sides even if so non-return piece 220 is only against the second land 216
On be also impossible to block inner joint 213 completely.In another example when non-return piece 220 is only against the second land 216, the is only only against
The radial direction side of two land 216, rather than the radially opposite sides of the second land 216 are only against simultaneously, it thus can also realize non-return
Piece 220 was both only against in the side wall of inner joint 213, and and can and the side wall of inner joint 213 have air gap.Certain above-mentioned two mode
Only it is that to be formed as the schematically illustrating for form of acute angle between the end face to the land 216 of non-return piece 220 and second be not specific
Limitation.
In certain embodiments, as shown in Fig. 2 non-return piece 220 includes axis body 222, swing rod 223 and valve block 224, axis body
222 and valve block 224 be located at the both ends of swing rod 223, be provided with the axial trough 217 for being used for accommodating axis body 222 in valve body 210, valve block 224 is used
It is engaged in external tapping 214.It is understood that when buoyancy or external pressure are acted on valve block 224, valve block 224
The axis body 222 in axial trough 217 can be driven to rotate, thus, need to only set the size of axis body 222 and axial trough 217, you can complete valve
Piece 224 moves between open and closed positions.
Specifically, axis body 222 is formed as cuboid, and axial trough 217 is formed as the shape being adapted with the shape of axis body 222,
And axial trough 217 is more than the sectional dimension of axis body 222 in the sectional dimension on axis of oscillation direction.Thus, axis body 222 exists
The interior rotation of axial trough 217 is restricted, that is, axis body 222 can not in axial trough 217 360 ° rotation, thus prevent due to
Valve block 224 caused by the transition of axis body 222 rotation can not block external tapping 214 well or closure inner joint 213 completely does not stay
The phenomenon of air gap occurs.Certainly, the shape of axis body 222 and axial trough 217 can also have in other, such as the side of being formed as of axial trough 217
Shape, axis body 222 are formed as ball etc..
In certain embodiments, external tapping 214 is located on the roof of valve body 210, and inner joint 213 is arranged on valve body 210
On bottom wall, non-return piece 220 is swung along the vertical direction.Thus, when negative pressure is smaller in exhaust passage, non-return piece 220 can also be
In the presence of self gravitation, open position is fallen back to balance the pressure difference of exhaust passage.Therefore, external tapping 214 is located at valve body
On 210 roof, inner joint 213 is arranged on the bottom wall of valve body 210, and non-return piece 220 is swung along the vertical direction so that check valve
Pressure difference in 20 pairs of exhaust passages is very sensitive, so as to enhance the effect of balance pressure difference.
In certain embodiments, as shown in Fig. 2 the core on the surface towards external tapping 214 of non-return piece 220 is formed
The cambered surface of the direction extension away from external tapping 214 is formed towards for plane, marginal portion.Thus, it is possible to ensure non-return piece 220
Only it is against the sealing effect of external interface 214 when on the perisporium of external tapping 214.The shape of certain non-return piece 220 can also be direct
Be formed as the other shapes such as tabular.
In certain embodiments, on the inwall of the company's of the being integrally formed in gas passage 120 of valve body 210.Thus, check valve is reduced
20 production cost, simplify the assembly technology of check valve 20.
The concrete structure of the respirator 100 of the dish-washing machine of a specific embodiment of the invention is described below with reference to Fig. 1-Fig. 4.
As shown in figure 1, the respirator 100 of dish-washing machine includes ventilator housing 10 and check valve 20, in ventilator housing 10
Drainage channel 110 and even gas passage 120 are limited, drainage channel 110 has wastewater inlet 111 and outlet of sewer 112, and even gas leads to
Road 120 has drainage ventilation mouth 121 and a pneumostome 122, the communicated drainage passage 110 of drainage ventilation mouth 121 and is located at wastewater inlet
Between 111 and outlet of sewer 112, pneumostome 122 connects ambient atmosphere.
As shown in Fig. 2 check valve 20 includes valve body 210 and non-return piece 220, the company's of the being located at gas passage 120 of valve body 210 is interior and stifled
Cut between drainage ventilation mouth 121 and pneumostome 122, valve body 210 has external tapping 214 and inner joint 213, and external tapping 214 connects
Logical pneumostome 122, the communicated drainage blow vent 121 of inner joint 213.Valve body 210 has the first land set around pneumostome 122
215 and the second land 216 for being set around drainage ventilation mouth 121.Non-return piece 220 includes axis body 222, swing rod 223 and valve block
224, axis body 222 and valve block 224 are located at the both ends of swing rod 223, and the axial trough 217 for being used for accommodating axis body 222 is provided with valve body 210,
Valve block 224 is used to be engaged with external tapping 214.Valve block 224 is swingably located between external tapping 214 and inner joint 213, valve block
224 have open position and closed position, and at closed position, non-return piece 220 only supports in the first land 215 and blocks external tapping
214 (as shown in Figure 3), at open position, valve block 224 is only against in the second land of setting 216 of valve body 210 and and inner joint
Air gap is formed between 213 with ventilating air (as shown in Figure 4).
As shown in Fig. 2 axis body 222 is formed as cuboid, axial trough 217 is formed as the shape being adapted with the shape of axis body 222
Shape, and axial trough 217 is more than the sectional dimension of axis body 222 in the sectional dimension on axis of oscillation direction.Non-return piece 220
Be formed as plane towards the core on the surface of external tapping 214, marginal portion is formed towards the direction away from external tapping 214
The cambered surface of extension.
The respirator 100 of the dish-washing machine of the present embodiment, due to opening or closing connection breathing in interior be provided with of even gas passage 120
The non-return piece 220 of the external tapping 214 of mouth 122, when can preferably ensure dish-washing machine proper drainage, sewage is without going past pneumostome
122 discharge respirators 100, and can balance the pressure difference in drainage channel 110, prevent the sewage in drainage channel 110 from flowing back
Phenomenon occur.In addition, the mode of pneumostome 122 is opened or closed using the motion of non-return piece 220 very reliably and stably,
And service life is longer.
Water tank type dish-washing machine according to embodiments of the present invention, include the respirator 100 of described dish-washing machine.
Water tank type dish-washing machine according to embodiments of the present invention, due to can be preferable provided with previously described respirator 100
When ensureing dish-washing machine proper drainage, sewage discharges respirator 100 without going past pneumostome 122, and and can is balanced in drainage channel 110
Pressure difference, prevent the sewage in drainage channel 110 from the phenomenon that flows back occur and occurring.In addition, the reliability of respirator 100 is preferable,
The physical life of check valve 20 of respirator 100 is longer.
Other compositions of water tank type dish-washing machine according to embodiments of the present invention such as tank and water softener and operation pair
All it is known for those of ordinary skill in the art, is not detailed herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that:Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (9)
- A kind of 1. respirator of dish-washing machine, it is characterised in that including:Ventilator housing, drainage channel is limited in the ventilator housing and even gas passage, the drainage channel have sewage Import and outlet of sewer, the even gas passage have drainage ventilation mouth and pneumostome, and the drainage ventilation mouth connects the draining Passage and between the wastewater inlet and the outlet of sewer, the pneumostome connect ambient atmosphere;Check valve, the check valve include:Valve body, the valve body are located in company's gas passage and intercepted between the drainage ventilation mouth and the pneumostome, institute Stating valve body has external tapping and inner joint, and the external tapping connects the pneumostome, the inner joint communicated drainage blow vent;Non-return piece, the non-return piece are swingably located between the external tapping and the inner joint, and the non-return piece, which has, to be beaten Open position and closed position, at closed position, the non-return piece stops in the side wall for the setting external tapping for being against the valve body And the closure external tapping, at open position, the non-return piece stops in the side wall for the setting inner joint for being against the valve body And air gap is formed between the inner joint with ventilating air.
- 2. the respirator of dish-washing machine according to claim 1, it is characterised in that the valve body has around the pneumostome The first land set, at closed position, the non-return piece is fitted on the end face of first land.
- 3. the respirator of dish-washing machine according to claim 1, it is characterised in that the valve body has to be led to around the draining Gas port set the second land, at open position the non-return piece only be against in second land, and the non-return piece with Acute angle is formed between the end face of second land.
- 4. the respirator of dish-washing machine according to claim 1, it is characterised in that the non-return piece includes:Axis body, swing rod and Valve block, the axis body and the valve block are located at the both ends of the swing rod, and the axle for being used for accommodating the axis body is provided with the valve body Groove, the valve block are used to be engaged with the external tapping.
- 5. the respirator of dish-washing machine according to claim 4, it is characterised in that the axis body is formed as cuboid, described Axial trough is formed as the shape being adapted with the shape of the axis body, and the axial trough is in the section on axis of oscillation direction Size is more than the sectional dimension of the axis body.
- 6. the respirator of dish-washing machine according to claim 1, it is characterised in that the external tapping is located at the top of the valve body On wall, the inner joint is arranged on the bottom wall of the valve body, and the non-return piece is swung along the vertical direction.
- 7. the respirator of dish-washing machine according to claim 1, it is characterised in that the direction external tapping of the non-return piece Surface core be formed as plane, marginal portion be formed towards away from the external tapping direction extend cambered surface.
- 8. the respirator of the dish-washing machine according to any one of claim 1-7, it is characterised in that the valve body is formed On the inwall for connecting gas passage.
- 9. a kind of water tank type dish-washing machine, it is characterised in that including exhaling for the dish-washing machine according to any one of claim 1-8 Haustorium.
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CN201711193927.1A CN107752947B (en) | 2017-11-24 | 2017-11-24 | Respirator of dish-washing machine and sink-type dish-washing machine |
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CN107752947B CN107752947B (en) | 2023-09-26 |
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Cited By (1)
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CN108968864A (en) * | 2018-09-21 | 2018-12-11 | 宁波佳音机电科技股份有限公司 | Respirator and its dish-washing machine |
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CN107752947B (en) | 2023-09-26 |
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