CN208755739U - The two-way thermostat of portable nursing bottle - Google Patents

The two-way thermostat of portable nursing bottle Download PDF

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Publication number
CN208755739U
CN208755739U CN201820718439.1U CN201820718439U CN208755739U CN 208755739 U CN208755739 U CN 208755739U CN 201820718439 U CN201820718439 U CN 201820718439U CN 208755739 U CN208755739 U CN 208755739U
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CN
China
Prior art keywords
liner
power supply
portable nursing
installation cavity
nursing bottle
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.)
Expired - Fee Related
Application number
CN201820718439.1U
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Chinese (zh)
Inventor
王伟权
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Hongtai Technology Co ltd
Original Assignee
Shenzhen Qianhai Hong Shang Agel Ecommerce Ltd
Priority date (The priority date 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 date listed.)
Filing date
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Priority to CN201820718439.1U priority Critical patent/CN208755739U/en
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Publication of CN208755739U publication Critical patent/CN208755739U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Cookers (AREA)

Abstract

The utility model discloses a kind of two-way thermostat of portable nursing bottle, including device noumenon, lid, heating cooling assembly and Power Supply Assembly, wherein, device noumenon is formed with the accommodating cavity of upper end opening, and accommodating cavity is in the open end setting for being covered on device noumenon to be installed with placement feeding bottle, lid, it heats cooling assembly and is set to device noumenon, the feeding bottle being placed in accommodating cavity is freezed or be heated, Power Supply Assembly is set to device noumenon, for heating cooling assembly power supply.When the temperature of feeding bottle being placed in accommodating cavity is lower, cooling assembly work is heated, heating is switched to, so that the steady temperature that the temperature falling-rising height of the feeding bottle in accommodating cavity is suitable, so that the two-way thermostat of portable nursing bottle carries out two-way constant temperature to the feeding bottle being placed in accommodating cavity, user experience is improved.

Description

The two-way thermostat of portable nursing bottle
Technical field
The utility model relates to feeding bottle constant temperature technology field, in particular to a kind of two-way thermostat of portable nursing bottle.
Background technique
Baby milk is very nutritious, and protein content is very high, will if brewing milk powder with excessively high temperature Lead to protein denaturation, be difficult to melt if the water using low temperature brews milk powder, and the sense of baby oral cavity and esophagus to temperature Should be very sensitive, the milk of the milk of excessive temperature and low temperature excessively can all cause the discomfort of baby.
Currently, parent brews milk powder to baby need that boiled water is waited to be cooled to suitable temperature, or cold water is heated to Suitable temperature, or boiled water and cold water are liquidated, the temperature or the back of the hand for reusing thermometer measure water perceive water Temperature, wherein not only elapsed time is long, measurement process is complicated, in the case of also occurring inaccurate for the temperature for brewing milk powder, shadow Ring user experience.
Utility model content
The main purpose of the utility model is to propose a kind of two-way thermostat of portable nursing bottle, it is intended to two-way convenient for user The temperature of liquid in feeding bottle is controlled, user experience is improved.
To achieve the above object, the utility model proposes the two-way thermostat of portable nursing bottle, comprising:
Device noumenon is formed with the accommodating cavity of upper end opening, and the accommodating cavity is to be installed with placement feeding bottle;
Lid is arranged in the open end for being covered on described device ontology;
Heat cooling assembly, be set to described device ontology, to the feeding bottle being placed in the accommodating cavity carry out refrigeration or Heating;And
Power Supply Assembly is set to described device ontology, powers for the heating cooling assembly.
Preferably, the Power Supply Assembly includes rechargable power supplies, and the rechargable power supplies are electrically connected the heating refrigeration Component;Alternatively,
The Power Supply Assembly includes power supply interface circuit, and the power supply interface circuit is external power supply to be electrically connected to The heating cooling assembly;Alternatively,
The two-way thermostat of portable nursing bottle includes temperature sensor, and the temperature sensor is electrically connected to described Power Supply Assembly, the temperature sensor is set to described device ontology, to monitor the intrinsic temperature of described device.
Preferably, the heating cooling assembly includes:
Semiconductor chilling plate;And
Heating refrigeration commutation control circuit, the heating refrigeration commutation control circuit are electrically connected to the semiconductor refrigerating Piece and Power Supply Assembly, and make heating cooling assembly switching heating or refrigerating state, with to being placed in the accommodating cavity Feeding bottle is heated or is freezed.
Preferably, described device ontology includes:
Shell, the upper end is in opening setting;And
Liner is sheathed in the shell, and the upper end of the liner forms the accommodating cavity.
Preferably, an installation cavity is formed between the liner and the shell, the installation cavity includes being located at the liner Bottom installation cavity section between bottom wall and the outer shell bottom wall;
The semiconductor chilling plate is set in the bottom installation cavity section.
Preferably, the shell correspondence is equipped at intervals with multiple heat exchange holes in the region of the bottom installation cavity section parallel, Multiple heat exchange holes to form a heat exchange space in the bottom installation cavity section;
The semiconductor chilling plate has a both ends of heating refrigeration, the semiconductor chilling plate wherein one end and the liner Thermo-contact, the other end are set in the heat exchange space.
Preferably, the two-way thermostat of the portable nursing bottle further includes the thermal insulation layer being filled in the installation cavity.
Preferably, the temperature sensor setting is multiple.
Preferably, an installation cavity is formed between the liner and the shell, the installation cavity includes being located at the liner Side installation cavity section between outer side surface and the interior sidewall surface of the shell and it is located at the liner outer bottom wall surface and the shell Inner bottom wall face between bottom installation cavity section;
At least one temperature sensor is set in the side installation cavity section, is contacted with the side wall of the liner, to supervise The temperature of the side wall of inner is surveyed, at least one temperature sensor is set in the bottom installation cavity section, the bottom with the liner Wall contact, to monitor the temperature of the liner bottom wall.
Preferably, the two-way thermostat of the portable nursing bottle further includes the disinfection group being electrically connected with the Power Supply Assembly Part, the disinfectant component is set to described device ontology, to carry out disinfection to the feeding bottle being located in the accommodating cavity.
In technical solution provided by the utility model, the Power Supply Assembly is set to described device ontology, makes for the heating Cold assembly power supply, when the temperature of feeding bottle being placed in the accommodating cavity is higher, the heating cooling assembly work starts to freeze, So that the temperature of the feeding bottle in the accommodating cavity is reduced to suitable steady temperature, when the temperature of feeding bottle being placed in the accommodating cavity When lower, the heating cooling assembly work switches to heating, so that the temperature falling-rising height of the feeding bottle in the accommodating cavity is suitable for Steady temperature so that the two-way thermostat of the portable nursing bottle carries out two-way perseverance to the feeding bottle that is placed in the accommodating cavity Temperature improves user experience.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the schematic elevation view of an embodiment of the two-way thermostat of portable nursing bottle provided by the utility model;
Fig. 2 is heating refrigeration commutation control circuit electrical block diagram in Fig. 1;
Fig. 3 is the schematic elevation view of lid in Fig. 1.
Drawing reference numeral explanation:
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that directionality instruction is only used for solving if relating to directionality instruction in the utility model embodiment Relative positional relationship, the motion conditions etc. between component each under a certain particular pose are released, if the particular pose changes When, then directionality instruction also correspondingly changes correspondingly.
In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve The combination of case is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of two-way thermostat of portable nursing bottle, Fig. 1 to Fig. 3 be it is provided by the utility model just Take the schematic diagram of the embodiment of the two-way thermostat of formula feeding bottle.
Referring to Fig. 1, the two-way thermostat 100 of portable nursing bottle includes device noumenon 1, lid 2, heating refrigeration train Part 3 and Power Supply Assembly 4, wherein described device ontology 1 be formed with the accommodating cavity 12a, the accommodating cavity 12a of upper end opening to It is installed with placement feeding bottle, the lid 2 is in the open end setting for being covered on described device ontology 1, and the heating cooling assembly 3 is set to Described device ontology 1, the feeding bottle being placed in the accommodating cavity 12a is freezed or be heated, the Power Supply Assembly 4 is set to Described device ontology 1 is powered for the heating cooling assembly 3.
In technical solution provided by the utility model, the Power Supply Assembly 4 is set to described device ontology 1, is the heating Cooling assembly 3 is powered, and when the temperature of feeding bottle being placed in the accommodating cavity 12a is higher, the heating cooling assembly 3 works, and is opened Begin refrigeration, so that the temperature of the feeding bottle in the accommodating cavity 12a is reduced to suitable steady temperature, when being placed in the accommodating cavity When temperature of feeding bottle in 12a is lower, the heating cooling assembly 3 works, and heating is switched to, so that in the accommodating cavity 12a The suitable steady temperature of the temperature falling-rising height of feeding bottle, so that the two-way thermostat 100 of the portable nursing bottle is described to being placed in Feeding bottle in accommodating cavity 12a carries out two-way constant temperature, improves user experience.
The Power Supply Assembly 4 is described to guarantee the outdoor normal use of the two-way thermostat 100 of the portable nursing bottle The power supply mode of Power Supply Assembly 4 can be directly setting rechargeable type power supply, such as lithium battery etc. and may be implemented to charge repeatedly to make With, when being in, full charge, outdoors when use, naturally it is also possible to external mobile power supply, such as directly supplied with external charger baby The two-way thermostat 100 of the portable nursing bottle is supplied electricity to use, specifically, in the embodiments of the present invention, the power supply group Part 4 includes rechargable power supplies, and the rechargable power supplies are electrically connected the heating cooling assembly 3, alternatively, the Power Supply Assembly 4 Including power supply interface circuit, the power supply interface circuit is to be electrically connected to the heating cooling assembly 3, institute for external power supply Stating power supply interface circuit is circuit common in the art, such as the charging application, the external application movement that are common in mobile phone are small Fan etc. improves user experience so set, expanding two-way 100 application of thermostat of the portable nursing bottle.
Semiconductor chilling plate 3a is the Peltier effect using semiconductor material, when direct current is partly led by two kinds of differences Body material in series at galvanic couple when, the both ends of galvanic couple can absorb respectively heat and release heat, may be implemented refrigeration mesh , it is a kind of Refrigeration Technique for generating negative thermal resistance, its main feature is that movement-less part, reliability is also relatively high.The heating system Cold component 3 can switch between heating and refrigeration, and in the embodiments of the present invention, the heating cooling assembly 3 includes half Conductor cooling piece 3a and heating refrigeration commutation control circuit, wherein the heating refrigeration commutation control circuit is electrically connected to institute Semiconductor chilling plate 3a and Power Supply Assembly 4 are stated, and makes the switching of heating cooling assembly 3 heating or refrigerating state, with opposed It is heated or is freezed in the feeding bottle in the accommodating cavity 12a.
As shown in Fig. 2, the heating refrigeration commutation control circuit is the commutation electricity constituted with relay in the present embodiment Road, when heated, optocoupler U1 conducting, optocoupler 6,4 feet of the 12V voltage through being connected, then it is added separately to Q1 base stage through R2, R3, Q1 is full And conducting, relay K1 coil energization are attracted, normally-closed contact 1,2 disconnects, and normally opened contact 1,3 is closed.Since no cooling signals are defeated Out, therefore relay K2 maintains former static state, the black end of normally-closed contact 2 of the 12V voltage through relay K2,1 foot cooling piece, refrigeration The red end of piece, the normally opened contact 1,3 of relay K1 heats semiconductor chilling plate 3a to ground, when heating signal does not export, after Electric appliance K1 coil power down, restores static state, and cooling piece does not work;When exporting cooling signals, relay K2 is attracted, and K1 is kept Static state, cooling piece work in refrigerating state.It should be noted that the heating refrigeration commutation control circuit can also be to use solid-state The commutating circuit that relay is constituted or the commutating circuit with IR2110 chip drives field-effect tube.
In the embodiments of the present invention, described device ontology 1 includes shell 11 and liner 12, the upper end of the shell 11 It is arranged in opening, the liner 12 is sheathed in the shell 11, and the upper end of the liner 12 forms the accommodating cavity 12a.Institute It states and forms an installation cavity 13 between liner 12 and described device ontology 1, the installation cavity 13 includes being located at 12 outside of liner Side installation cavity section 132 between wall surface and the interior sidewall surface of the shell 11 and it is located at the 12 outer bottom wall surface of liner and described outer Bottom installation cavity section 131 between the inner bottom wall face of shell 11, the semiconductor chilling plate 3a are set in the bottom installation cavity section 131, 131 spaces of the bottom installation cavity section are big, are suitable for the placement semiconductor chilling plate 3a.
The semiconductor chilling plate 3a corresponds to the one side of the liner 12 as effect end, is in the other end of the cooling piece Non-active end, but the non-active end can also generate heat or cooling capacity, the other end requires to carry out heat exchange, by the other end Cold source or heat source with the external world exchange, extend the semiconductor chilling plate 3a use the time, specifically, the reality of the utility model It applies in example, the correspondence of shell 11 is equipped at intervals with multiple heat exchange holes 111 in the region of the bottom installation cavity section 131 parallel, Multiple heat exchange holes 111 to form a heat exchange space, the semiconductor chilling plate in the bottom installation cavity section 131 3a has the both ends of heating refrigeration, and wherein one end thermally contacts the semiconductor chilling plate 3a with the liner 12, and the other end is set to In the heat exchange space, by the heat exchange space by the heat at the non-active end of the semiconductor chilling plate 3a exchange to The external world, extend the semiconductor chilling plate 3a uses the time.
In order to reduce heat distributing to the shell 11, user experience is improved, it is described in the embodiments of the present invention The two-way thermostat 100 of portable nursing bottle further includes the thermal insulation layer 6 being filled in the side installation cavity section 132, the thermal insulation layer 6 Material can be vacuum insulation panel or other heat-insulated materials.
In the embodiments of the present invention, the two-way thermostat 100 of portable nursing bottle further includes temperature sensor 5, The temperature sensor 5 is electrically connected to the Power Supply Assembly 4, and the temperature sensor 5 is set to described device ontology 1, to The temperature in described device ontology 1 is monitored, it is described in order to fully grasp the cold and hot situation for the feeding bottle being placed in the liner 12 Temperature sensor 5 be arranged it is multiple, at least one temperature sensor 5 be set to the side installation cavity section 132 in, with the liner 12 Side wall contact, to monitor the temperature of 12 side wall of liner, at least one temperature sensor 5 is set to the bottom installation cavity In section 131, contacted with the bottom wall of the liner 12, to monitor the temperature of 12 bottom wall of liner, by being set in different parts Multiple temperature sensors 5 are set, so that more fully grasping the temperature of the feeding bottle in the accommodating cavity 12a, are preferably made The two-way thermostat 100 of portable nursing bottle carries out two-way thermostatic control to the milk products, has preferable effect.
While the two-way thermostat 100 of the portable nursing bottle has two-way temperature incubation function, the reality of the utility model It applies in example, the two-way thermostat 100 of portable nursing bottle further includes the disinfectant component being electrically connected with the Power Supply Assembly 4, The disinfectant component is set to described device ontology 1, to carry out disinfection to the feeding bottle being located in the accommodating cavity 12a, expands The function of the two-way thermostat 100 of the portable nursing bottle has preferable effect.
In the embodiments of the present invention, the portable nursing bottle chlorination equipment 100 further includes mentioning on lid 2 Hand 21, the lid 2 rotate the open end for being covered on the accommodating cavity 12a, and the handle 21, which can rotate, to be hidden in set on institute In the groove for stating 2 upper surface of lid, usually when not used, the handle 21 is hidden in the groove, when needing using carrying, The handle 21 can be rotated by 90 °, easy to operate, easy to carry, the overturning schematic lines a of handle 21 as described in being in Fig. 3.
It is as follows come the process for illustrating two-way constant temperature with specific two-way constant temperature method step below:
When the feeding bottle equipped with water is put by user or is poured into burning boiled water in the two-way thermostat cavity, use Family starter, the temperature of 5 detection device liner of temperature sensor, 12 cavity, when temperature is specified higher than temperature sensor 5 When temperature, the temperature sensor 5 transmits a signal to the heating refrigeration commutation control circuit, the heating refrigeration commutation control The regulation of electrical circuit current direction processed, the heating and cooling semiconductor chip start to freeze;When temperature is lower than 5 rated temperature of temperature sensor When, the temperature sensor 5 transmits a signal to the heating refrigeration commutation control circuit, the heating refrigeration commutation control electricity Road adjusts current direction, and the heating and cooling semiconductor chip starts to heat;When temperature sensor 5 detects the two-way constant temperature dress It sets when the water in device is reached preference temperature, the temperature sensor 5 transmits a signal to the Power Supply Assembly 4, the confession Electrical component 4 disconnects heating and cooling semiconductor chip operating circuit, and is discontinuously heated or freezed to device, and device enters constant temperature mould Formula takes out feeding bottle or pours out the water in described device until user closes device.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model, It is all under the design of the utility model, equivalent structure transformation made based on the specification and figures of the utility model, or Directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

Claims (10)

1. a kind of two-way thermostat of portable nursing bottle characterized by comprising
Device noumenon is formed with the accommodating cavity of upper end opening, and the accommodating cavity is to be installed with placement feeding bottle;
Lid is arranged in the open end for being covered on described device ontology;
Cooling assembly is heated, described device ontology is set to, the feeding bottle being placed in the accommodating cavity is freezed or be heated; And
Power Supply Assembly is set to described device ontology, powers for the heating cooling assembly.
2. the two-way thermostat of portable nursing bottle as described in claim 1, which is characterized in that the Power Supply Assembly includes that can fill Power supply, the rechargable power supplies are electrically connected the heating cooling assembly;Alternatively,
The Power Supply Assembly includes power supply interface circuit, and the power supply interface circuit is described external power supply to be electrically connected to Heat cooling assembly;Alternatively,
The two-way thermostat of portable nursing bottle includes temperature sensor, and the temperature sensor is electrically connected to the power supply Component, the temperature sensor is set to described device ontology, to monitor the intrinsic temperature of described device.
3. the two-way thermostat of portable nursing bottle as described in claim 1, which is characterized in that the heating cooling assembly packet It includes:
Semiconductor chilling plate;And
Heating refrigeration commutation control circuit, the heating freeze commutation control circuit be electrically connected to the semiconductor chilling plate and Power Supply Assembly, and make the heating cooling assembly switching heating or refrigerating state, to the feeding bottle being placed in the accommodating cavity It is heated or is freezed.
4. the two-way thermostat of portable nursing bottle as claimed in claim 3, which is characterized in that described device ontology includes:
Shell, the upper end is in opening setting;And
Liner is sheathed in the shell, and the upper end of the liner forms the accommodating cavity.
5. the two-way thermostat of portable nursing bottle as claimed in claim 4, which is characterized in that the liner and the shell it Between form an installation cavity, the installation cavity includes the bottom installation cavity section between the liner bottom wall and the outer shell bottom wall;
The semiconductor chilling plate is set in the bottom installation cavity section.
6. the two-way thermostat of portable nursing bottle as claimed in claim 5, which is characterized in that the shell is corresponding at the bottom Multiple heat exchange holes are equipped at intervals in the region of installation cavity section parallel, multiple heat exchange holes make in the bottom installation cavity section One heat exchange space of interior formation;
The semiconductor chilling plate has a both ends of heating, refrigeration, the semiconductor chilling plate wherein one end and the interior gallbladder-heat Contact, the other end are set in the heat exchange space.
7. the two-way thermostat of portable nursing bottle as claimed in claim 5, which is characterized in that the two-way perseverance of portable nursing bottle Warm device further includes the thermal insulation layer being filled in the installation cavity.
8. the two-way thermostat of portable nursing bottle as claimed in claim 2, which is characterized in that the temperature sensor setting is more It is a.
9. the two-way thermostat of portable nursing bottle as claimed in claim 8, which is characterized in that described device ontology includes shell With liner, wherein the upper shell is sheathed in the shell in opening setting, the liner, the upper end shape of the liner At the accommodating cavity;
An installation cavity is formed between the liner and the shell, the installation cavity includes being located at the liner outer side surface and institute State side installation cavity section between the interior sidewall surface of shell and positioned at the inner bottom wall face of the liner outer bottom wall surface and the shell it Between bottom installation cavity section;
At least one temperature sensor is set in the side installation cavity section, is contacted with the side wall of the liner, to monitor The temperature of side wall of inner is stated, at least one temperature sensor is set in the bottom installation cavity section, connects with the bottom wall of the liner Touching, to monitor the temperature of the liner bottom wall.
10. the two-way thermostat of portable nursing bottle as described in claim 1, which is characterized in that the portable nursing bottle is two-way Thermostat further includes the disinfectant component being electrically connected with the Power Supply Assembly, and the disinfectant component is set to described device ontology, To carry out disinfection to the feeding bottle being located in the accommodating cavity.
CN201820718439.1U 2018-05-15 2018-05-15 The two-way thermostat of portable nursing bottle Expired - Fee Related CN208755739U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820718439.1U CN208755739U (en) 2018-05-15 2018-05-15 The two-way thermostat of portable nursing bottle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820718439.1U CN208755739U (en) 2018-05-15 2018-05-15 The two-way thermostat of portable nursing bottle

Publications (1)

Publication Number Publication Date
CN208755739U true CN208755739U (en) 2019-04-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201820718439.1U Expired - Fee Related CN208755739U (en) 2018-05-15 2018-05-15 The two-way thermostat of portable nursing bottle

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110200811A (en) * 2019-05-02 2019-09-06 山西大学 A kind of intelligent constant-temperature feeding bottle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110200811A (en) * 2019-05-02 2019-09-06 山西大学 A kind of intelligent constant-temperature feeding bottle

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Address after: 518100 Room 201, building a, No. 1 Qianwan, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (settled in Shenzhen Qianhai business secretary Co., Ltd.)

Patentee after: Shenzhen Hongtai Technology Co.,Ltd.

Address before: 518100 Room 201, building a, No. 1 Qianwan, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (settled in Shenzhen Qianhai business secretary Co., Ltd.)

Patentee before: SHENZHEN QIANHAI HONGSHANG ELECTRONIC COMMERCE Co.,Ltd.

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Granted publication date: 20190419