CN112128993B - Solar vacuum tube water heater sealing ring auxiliary installation device - Google Patents

Solar vacuum tube water heater sealing ring auxiliary installation device Download PDF

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Publication number
CN112128993B
CN112128993B CN202011035127.9A CN202011035127A CN112128993B CN 112128993 B CN112128993 B CN 112128993B CN 202011035127 A CN202011035127 A CN 202011035127A CN 112128993 B CN112128993 B CN 112128993B
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sealing ring
vacuum tube
wall
auxiliary installation
stainless steel
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CN112128993A (en
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齐宁
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Shandong Xinqi Industrial Group Trading Co ltd
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Shandong Xinqi Industrial Group Trading Co ltd
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Priority to CN202111371156.7A priority patent/CN114183935A/en
Publication of CN112128993A publication Critical patent/CN112128993A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/70—Sealing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/47—Mountings or tracking

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

本发明公开了一种太阳能真空管热水器密封圈辅助安装装置，它包括通过支撑架支撑的水桶，所述水桶包括不锈钢内胆和套装在所述不锈钢内胆外侧的套筒，所述不锈钢内胆与所述套筒之间设有保温层，所述水桶的侧壁上设有一排真空管插入孔，每个所述真空管插入孔的内部分别设有密封圈安装槽，一外壁的中部设有的带第一环槽的密封圈，所述真空管插入孔内所述密封圈的一侧外壁扣接在所述密封圈安装槽内，且所述不锈钢内胆的圆环孔的一侧同时扣接在所述第一环槽内，并通过活动紧固装置对其临时固定，所述活动紧固装置上设有钢带，所述钢带上套装有密封圈辅助安装块，所述密封圈辅助安装块的外壁与所述密封圈的内壁相接触并在外力作用下沿所述钢带位移；采用上述结构，实现了结构简单，使用操作方便且能够快速安装的效果。

Figure 202011035127

The invention discloses an auxiliary installation device for a sealing ring of a solar vacuum tube water heater. There is an insulating layer between the sleeves, a row of vacuum tube insertion holes are arranged on the side wall of the water bucket, each of the vacuum tube insertion holes is respectively provided with a sealing ring installation groove, and a belt is arranged in the middle of the outer wall. The sealing ring of the first ring groove, the outer wall of one side of the sealing ring in the vacuum tube insertion hole is buckled in the sealing ring installation groove, and one side of the annular hole of the stainless steel inner tank is buckled at the same time. The first ring groove is temporarily fixed by a movable fastening device. The movable fastening device is provided with a steel belt, and the steel belt is sheathed with a sealing ring auxiliary installation block, and the sealing ring is used for auxiliary installation. The outer wall of the block is in contact with the inner wall of the sealing ring and is displaced along the steel strip under the action of external force; the above structure achieves the effects of simple structure, convenient operation and quick installation.

Figure 202011035127

Description

Auxiliary mounting device for sealing ring of solar vacuum tube water heater
Technical Field
The invention relates to an auxiliary mounting device for a sealing ring of a solar vacuum tube water heater.
Background
At present, solar vacuum tube water heaters are widely applied to thousands of households, but a large amount of water and alkali can be generated in a bucket due to long-term solarization, excessive water can flow out through an overflow pipe when water is supplied to the water tank again after water is used, the water and alkali in the bucket can gradually block the overflow pipe after long-term use, at the moment, because the overflow pipe is gradually blocked by the water alkali, a vacuum state or a state close to the vacuum state is formed in the bucket when water is supplied, and the air discharge amount is small, so that the air pressure in the water barrel is increased, and when reaching a certain pressure, individual vacuum tubes can be ejected and damaged, the sealing ring installed in the production process can sometimes be separated from the sealing groove in the hole of the vacuum tube when the vacuum tube is ejected, and the insulating layer is thicker when the vacuum tube is replaced again, and the pipe hole of the vacuum pipe is small and the finger cannot touch the sealing groove, so that the sealing ring is difficult to install in the sealing groove.
Disclosure of Invention
The invention aims to provide an auxiliary mounting device for a sealing ring of a solar vacuum tube water heater, which has a simple structure, is convenient to use and operate and can be quickly mounted.
The invention provides an auxiliary mounting device for a sealing ring of a solar vacuum tube water heater, which comprises a water barrel supported by a support frame 2, wherein the water barrel comprises a stainless steel inner container 6 and a sleeve 1 sleeved outside the stainless steel inner container 6, a heat insulation layer 8 is arranged between the stainless steel inner container 6 and the sleeve 1, a row of vacuum tube insertion holes 3 communicated with the water barrel are arranged on the side wall of the water barrel, a sealing ring mounting groove 21 is respectively arranged inside each vacuum tube insertion hole 3 and between the outer wall of the stainless steel inner container 6 and the inner wall of the heat insulation layer 8, and the auxiliary mounting device is characterized in that: the middle part of 7 outer walls of a sealing washer be equipped with the first annular 18 of 6 wall thickness looks adaptations of stainless steel inner bag, in the vacuum tube patchhole 3 one side outer wall lock joint of sealing washer 7 is in the sealing washer mounting groove 21, just one side lock joint in the ring hole of stainless steel inner bag 6 is in first annular 18 to it is temporarily fixed to it through activity fastener 9, be equipped with circular steel band 12 on the activity fastener 9, the cover is equipped with the supplementary installation piece of at least one sealing washer on the steel band 12, the outer wall of the supplementary installation piece of sealing washer with the inner wall of sealing washer 7 contacts and follows under the exogenic action steel band 12 displacements.
The technical scheme of the invention can also be that the movable fastening device 9 comprises a screw 10 with a first flange 22 at the upper end, the steel belt 12 is arranged on the screw 10 and adjacent to the first flange 22, the cross bar 11 is sleeved at the free end of the screw 10, and the fastening nut 20 is arranged at the lower end of the screw 10.
The technical scheme of the invention can also be that the sealing ring auxiliary mounting block comprises a sliding block 13 with a second flange 16 at the upper end part, a through groove 15 is arranged in the middle of the sliding block 13, the through groove 15 of the sliding block 13 penetrates through the steel belt 12 and is displaced along the steel belt 12 under the action of external force, and a connecting rod 14 is further arranged at the bottom of the sliding block 13.
The technical scheme of the invention can also be that two second ring grooves 19 are arranged on the inner wall of the sealing ring 7 in parallel.
The technical scheme of the invention can also be that the outer wall of the sliding block 13 is arc-shaped, and two third flanges 17 matched with the two second annular grooves 19 are arranged on the outer wall of the sliding block.
The technical scheme of the invention can also be that the front end of the support frame 2 is also provided with a support seat 5, vacuum tube insertion seats 23 corresponding to the vacuum tube insertion holes 3 are arranged on the support seat, and a vacuum tube 4 is respectively arranged between each vacuum tube insertion hole 3 and the corresponding vacuum tube insertion seat 23.
The invention has the advantages that the bucket is supported by the support frame 2, the bucket comprises a stainless steel inner container 6 and a sleeve 1 sleeved outside the stainless steel inner container 6, a heat insulation layer 8 is arranged between the stainless steel inner container 6 and the sleeve 1, a row of vacuum tube inserting holes 3 communicated with the bucket are arranged on the side wall of the bucket, a sealing ring installing groove 21 is respectively arranged inside each vacuum tube inserting hole 3 and between the outer wall of the stainless steel inner container 6 and the inner wall of the heat insulation layer 8, a first ring groove 18 matched with the wall thickness of the stainless steel inner container 6 is arranged in the middle of the outer wall of a sealing ring 7, the outer wall of one side of the sealing ring 7 in the vacuum tube inserting hole 3 is buckled in the sealing ring installing groove 21, one side of the ring hole of the stainless steel inner container 6 is buckled in the first ring groove 18 at the same time and is temporarily fixed by the movable fastening device 9, a circular steel belt 12 is arranged on the movable fastening device 9, at least one sealing ring auxiliary mounting block is sleeved on the steel belt 12, and the outer wall of the sealing ring auxiliary mounting block is in contact with the inner wall of the sealing ring 7 and moves along the steel belt 12 under the action of external force; when in use, the outer wall of one side of the sealing ring 7 is buckled in the sealing ring mounting groove 21, the stainless steel liner 6 is buckled in the first annular groove 18 at the same time and is temporarily fixed by the movable fastening device 9, then the outer wall of the auxiliary installation block of the sealing ring is contacted with the inner wall of the sealing ring 7, the auxiliary installation block of the sealing ring moves along the steel belt 12 under the action of external force from the position adjacent to the movable fastening device 9, or the auxiliary installation block of the sealing ring moves along the steel belt 12 under the action of external force from the position adjacent to the movable fastening device 9 from two directions, so that the whole sealing ring can be smoothly installed in the installation groove 21 of the sealing ring, and the stainless steel inner container 6 is simultaneously buckled in the first ring groove 18, so that the effects of simple structure, convenient use and operation and quick installation are realized.
Drawings
FIG. 1 is a schematic structural view of a solar vacuum tube water heater
FIG. 2 is a schematic view of the structure of the water tub of FIG. 1
FIG. 3 is a top view of the water tub of FIG. 2
FIG. 4 is a view taken along the line A in FIG. 3
FIG. 5 is a schematic structural view of the invention
FIG. 6 is a top view of FIG. 5
FIG. 7 is a schematic structural view of the auxiliary installation device for the sealing ring in FIG. 5
FIG. 8 is a schematic view of the seal ring of FIG. 3
FIG. 9 is a cross-sectional view of FIG. 8
FIG. 10 is a schematic view of the structure of the auxiliary mounting block of the sealing ring in FIG. 5
FIG. 11 is a state diagram of the use of FIG. 5
FIG. 12 is a schematic view of the structure of the vacuum tube insertion hole in FIG. 4
In fig. 1 to 12, 1 is a sleeve, 2 is a support frame, 3 is a vacuum tube insertion hole, 4 is a vacuum tube, 5 is a support base, 6 is a stainless steel inner container, 7 is a seal ring, 8 is an insulating layer, 9 is a movable fastening device, 10 is a screw, 11 is a cross bar, 12 is a steel strip, 13 is a slide block, 14 is a connecting rod, 15 is a through groove, 16 is a second flange, 17 is a third flange, 18 is a first ring groove, 19 is a second ring groove, 20 is a fastening nut, 21 is a seal ring installation groove, 22 is a first flange, 23 is a vacuum tube insertion base.
Detailed Description
Referring to fig. 1 to 12, the present invention relates to an auxiliary sealing ring installation device for a solar vacuum tube water heater, which comprises a water tank supported by a support frame 2, wherein the front end of the support frame 2 is further provided with a support base 5 on which vacuum tube insertion bases 23 corresponding to the vacuum tube insertion holes 3 are arranged, a vacuum tube 4 is respectively arranged between each vacuum tube insertion hole 3 and the corresponding vacuum tube insertion base 23, the water tank comprises a stainless steel inner container 6 and a sleeve 1 sleeved outside the stainless steel inner container 6, a heat insulation layer 8 is arranged between the stainless steel inner container 6 and the sleeve 1, a row of vacuum tube insertion holes 3 communicated with the water tank are arranged on the side wall of the water tank, a sealing ring installation groove 21 is respectively arranged inside each vacuum tube insertion hole 3 and between the outer wall of the stainless steel inner container 6 and the inner wall of the heat insulation layer 8, the middle part of the outer wall of a sealing ring 7 is provided with a first annular groove 18 matched with the wall thickness of the stainless steel inner container 6, two second annular grooves 19 are arranged on the inner wall of the sealing ring 7 in a parallel manner, one outer wall of one side of the sealing ring 7 is buckled in the sealing ring mounting groove 21 in the vacuum pipe inserting hole 3, one side of the annular hole of the stainless steel inner container 6 is buckled in the first annular groove 18 at the same time and is temporarily fixed by a movable fastening device 9, a circular steel belt 12 is arranged on the movable fastening device 9, the movable fastening device 9 comprises a screw rod 10 of which the upper end part is provided with a first flange 22, the screw rod 10 is provided with the steel belt 12 at a position close to the first flange 22, a cross rod 11 is sleeved at the free end of the screw rod 10, a fastening nut 20 is arranged at the lower end of the screw rod 10, two sealing ring auxiliary mounting blocks are sleeved on the steel belt 12, the sealing ring auxiliary mounting block comprises a sliding block 13, the end part of the upper end of the sliding block is provided with a second flange 16, the outer wall of the sliding block 13 is arc-shaped, the outer wall of the sliding block 13 is provided with two third flanges 17 matched with the two second annular grooves 19, the middle part of the sliding block 13 is provided with a through groove 15, the through groove 15 of the sliding block 13 penetrates through the steel belt 12 and moves along the steel belt 12 under the action of external force, the bottom of the sliding block 13 is also provided with a connecting rod 14, and the outer wall of the sealing ring auxiliary mounting block is in contact with the inner wall of the sealing ring 7 and moves along the steel belt 12 under the action of external force; during the use, with one side outer wall lock joint of sealing washer 7 in sealing washer mounting groove 21, just one side lock joint of the ring hole of stainless steel inner bag 6 is in first annular 18 simultaneously to set up the first flange 22 on the activity fastener 9 on the upper portion of sealing washer 7, the lateral wall of screw rod 10 and the inner wall contact of sealing washer 7, then through fastening nut 20 with horizontal pole 11 temporary fixation on the outer wall of sleeve 1, thereby with one side outer wall lock joint of sealing washer 7 in sealing washer mounting groove 21, just one side lock joint of the ring hole of stainless steel inner bag 6 is in first annular 18 simultaneously, then set up the second flange 16 in the supplementary installation piece of sealing washer on the upper portion of sealing washer 7, and with the outer wall of slider 13 with the inner wall of sealing washer 7 contacts, hold connecting rod 14 with the hand and with slider 13 from neighbouring activity fastener 9 department under the exogenic action with slider 13 along the steel band 12 displacement with second flange 16 is down Press seal ring 7, also can follow two directions and use two sliders 13 from neighbouring activity fastener 9 department follows closely slider 13 under exogenic action the second flange 16 is to press seal ring 7 down in the time of steel band 12 displacements, can install whole sealing washer smoothly in sealing washer mounting groove 21 like this to with the ring hole lock joint simultaneously of stainless steel inner bag 6 in whole circumferencial direction in first annular 18, accomplished sealing washer installation work through the supplementary installation device of sealing washer, realized simple structure, use convenient operation and the effect that can install fast.

Claims (6)

1.一种太阳能真空管热水器密封圈辅助安装装置，它包括通过支撑架（2）支撑的水桶，所述水桶包括不锈钢内胆（6）和套装在所述不锈钢内胆（6）外侧的套筒（1），所述不锈钢内胆（6）与所述套筒（1）之间设有保温层（8），所述水桶的侧壁上设有一排与所述水桶连通的真空管插入孔（3），每个所述真空管插入孔（3）的内部且在所述不锈钢内胆（6）的外壁与所述保温层（8）的内壁之间分别设有密封圈安装槽（21），其特征在于：一密封圈（7）外壁的中部设有与所述不锈钢内胆（6）壁厚相适配的第一环槽（18），所述真空管插入孔（3）内所述密封圈（7）的一侧外壁扣接在所述密封圈安装槽（21）内，且所述不锈钢内胆（6）的圆环孔的一侧同时扣接在所述第一环槽（18）内，并通过活动紧固装置（9）对其临时固定，所述活动紧固装置（9）上设有圆形钢带（12），所述钢带（12）上套装有至少一个密封圈辅助安装块，所述密封圈辅助安装块的外壁与所述密封圈（7）的内壁相接触并在外力作用下沿所述钢带（12）位移。1. An auxiliary installation device for a sealing ring of a solar vacuum tube water heater, comprising a water bucket supported by a support frame (2), the water bucket comprising a stainless steel inner liner (6) and a sleeve sleeved on the outer side of the stainless steel inner liner (6). (1), an insulating layer (8) is provided between the stainless steel liner (6) and the sleeve (1), and a row of vacuum tube insertion holes ( 3), each of the vacuum tubes is inserted into the inside of the hole (3), and a sealing ring installation groove (21) is respectively provided between the outer wall of the stainless steel liner (6) and the inner wall of the insulation layer (8), It is characterized in that: a first ring groove (18) adapted to the wall thickness of the stainless steel inner pot (6) is provided in the middle of the outer wall of a sealing ring (7), and the sealing ring is inserted in the vacuum tube insertion hole (3). One side outer wall of (7) is fastened in the sealing ring installation groove (21), and one side of the annular hole of the stainless steel inner pot (6) is fastened in the first ring groove (18) at the same time. and temporarily fix it by a movable fastening device (9), the movable fastening device (9) is provided with a circular steel belt (12), and at least one sealing ring is sleeved on the steel belt (12). An auxiliary installation block, the outer wall of the sealing ring auxiliary installation block is in contact with the inner wall of the sealing ring (7) and is displaced along the steel strip (12) under the action of an external force. 2.根据权利要求1所述的太阳能真空管热水器密封圈辅助安装装置，其特征在于：所述活动紧固装置（9）包括上端端部带有第一凸缘（22）的螺杆（10），所述螺杆（10）上且邻近所述第一凸缘（22）处设置所述钢带（12），所述螺杆（10）的自由端套装有横杆（11），所述螺杆（10）的下端设有紧固螺母（20）。2. The solar vacuum tube water heater sealing ring auxiliary installation device according to claim 1, characterized in that: the movable fastening device (9) comprises a screw (10) with a first flange (22) at the upper end, The steel strip (12) is arranged on the screw (10) and adjacent to the first flange (22), the free end of the screw (10) is sleeved with a cross bar (11), and the screw (10) ) is provided with a fastening nut (20). 3.根据权利要求1所述的太阳能真空管热水器密封圈辅助安装装置，其特征在于：所述密封圈辅助安装块包括上端端部带有第二凸缘（16）的滑块（13），所述滑块（13）的中部设有通槽（15），所述滑块（13）的通槽（15）穿过所述钢带（12）并在外力作用下沿所述钢带（12）位移，所述滑块（13）的底部还设有连杆（14）。3. The solar vacuum tube water heater sealing ring auxiliary installation device according to claim 1, wherein the sealing ring auxiliary installation block comprises a slider (13) with a second flange (16) on the upper end, so A through slot (15) is provided in the middle of the slider (13), and the through slot (15) of the slider (13) passes through the steel belt (12) and moves along the steel belt (12) under the action of an external force. ) displacement, the bottom of the slider (13) is also provided with a connecting rod (14). 4.根据权利要求3所述的太阳能真空管热水器密封圈辅助安装装置，其特征在于：所述密封圈（7）内壁上平行的设有两条第二环槽（19）。4 . The auxiliary installation device for a sealing ring of a solar vacuum tube water heater according to claim 3 , wherein two second annular grooves ( 19 ) are arranged in parallel on the inner wall of the sealing ring ( 7 ). 5 . 5.根据权利要求4所述的太阳能真空管热水器密封圈辅助安装装置，其特征在于：所述滑块（13）的外壁呈弧形且其外壁上设有与两所述第二环槽（19）相适配的两第三凸缘（17）。5. The solar vacuum tube water heater sealing ring auxiliary installation device according to claim 4, characterized in that: the outer wall of the slider (13) is arc-shaped and the outer wall is provided with two second ring grooves (19). ) are matched with two third flanges (17). 6.根据权利要求1-5任一所述的太阳能真空管热水器密封圈辅助安装装置，其特征在于：所述支撑架（2）的前端还设有支撑座（5）且其上设有与所述真空管插入孔（3）相对应的真空管插入座（23），每个所述真空管插入孔（3）与相对应的所述真空管插入座（23）之间分别设有真空管（4）。6. The solar vacuum tube water heater sealing ring auxiliary installation device according to any one of claims 1-5, characterized in that: the front end of the support frame (2) is further provided with a support seat (5), and a support seat (5) is provided on the support frame (2). A vacuum tube insertion seat (23) corresponding to the vacuum tube insertion hole (3) is provided, and a vacuum tube (4) is respectively provided between each of the vacuum tube insertion hole (3) and the corresponding vacuum tube insertion seat (23).
CN202011035127.9A 2020-09-27 2020-09-27 Solar vacuum tube water heater sealing ring auxiliary installation device Active CN112128993B (en)

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CN202011035127.9A CN112128993B (en) 2020-09-27 2020-09-27 Solar vacuum tube water heater sealing ring auxiliary installation device
CN202111371156.7A CN114183935A (en) 2020-09-27 2020-09-27 Use method of auxiliary mounting device for sealing ring of solar vacuum tube water heater

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CN201688597U (en) * 2010-02-01 2010-12-29 北京华业阳光新能源有限公司 Installing structure of full-glass vacuum solar heating collecting pipe
CN207350974U (en) * 2017-07-03 2018-05-11 榆林学院 A kind of solar heating engineering thermal collecting header
CN208253977U (en) * 2018-05-22 2018-12-18 江苏省华扬太阳能有限公司 vacuum tube pressure-bearing type solar water heater

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