Task of the present utility model provides a kind of novel evacuated thermal-collecting tube, use in the time of can be in northern area winter-50 ℃, working medium in the novel evacuated thermal-collecting tube can not freezed, the four seasons can be used, it is simpler than heat pipe-type vacuum heat collection pipe technology, easy to manufacture, price reduces significantly, if and damaged one of novel evacuated thermal-collecting tube, solar water heater or hot water engineering system can not leak, and be reliable, and immediately go up water after empty the solarization noon, can bombing yet, the every field that helps solar thermal utilization especially in the engineering system large tracts of land promote the use of widely.
The utility model is achieved in that the upper end is sticked with glue agent sealing splicing with metal tube that liquid injecting mouth was arranged at the end and the end and all-glass vacuum thermal-collecting tube at its oral area, vacuumize the back by liquid injecting mouth and in all-glass vacuum thermal-collecting tube, be full of liquid refrigerant, in metal tube, also be filled with an amount of liquid refrigerant, at metal intraductal working medium liquid and top, leave the suitable space that stores steam state working medium, at last liquid injecting mouth is pressed from both sides the flat sealing of freezing, thereby form novel evacuated thermal-collecting tube.
Below in conjunction with accompanying drawing the utility model is described in further detail:
This novel evacuated thermal-collecting tube is to stick with glue agent [4] sealing with all-glass vacuum thermal-collecting tube [1] at its oral area [10] by the metal tube [5] that liquid injecting mouth [7] are arranged on [6] at the bottom of [6] order at the bottom of the band of upper end to glued joint, after vacuumizing by liquid injecting mouth [7], inner chamber at all-glass vacuum thermal-collecting tube [1] is full of liquid refrigerant [11], inner chamber [3] in metal tube [5] also is filled with liquid refrigerant [11], its the corresponding heat that heat exchange area transmitted of height that fills liquid refrigerant [9] in the metal tube [5] should equal the heat that heat exchange area transmitted greater than all-glass vacuum thermal-collecting tube [1] inner glass tube [2], the top of medium level in metal tube [5], leave the space [8] that stores working substance steam, its volume equals greater than the swell increment of its volume of liquid refrigerant in novel vacuum heat collection pipe during heat production in summer water maximum temperature in the solar water heater or in the connecting pipe, at last with the flat sealing of freezing of liquid injecting mouth [6] folder, thereby make novel evacuated thermal-collecting tube, its heat transfer theory is because the interior high little come-up of liquid refrigerant proportion of temperature of thermal-collecting tube, the low working medium of temperature is than great sinking, convection heat transfer' heat-transfer by convection is main, is attended by Working fluid phase changing and conducts heat.
This novel evacuated thermal-collecting tube both can be enclosed within metal tube [5] on the outer wall of its oral area of all-glass vacuum thermal-collecting tube [1] [10] sealing and glued joint, and also metal tube [5] can be inserted on the inwall of its oral area of all-glass vacuum thermal-collecting tube [1] [10] sealing and glued joint.
This novel evacuated thermal-collecting tube both can be made metal tube straight barrel type metal tube [5A], the external diameter of its cementing position equals the external diameter at its heat exchange position of metal tube [5A], also metal tube can be made step metal tube [5B], that is the external diameter of metal tube [5B] cementing position is greater than the external diameter at metal tube [5B] heat exchange position.
This novel evacuated thermal-collecting tube, chamber [3] both can not tubulature core within it, keep cylindrical cavity [3A], be applicable to cheap working medium, also can fix the tube core [13] or the plug [13B] of a closed at both ends by elastic support [14], form annular cavity [3B] in novel evacuated thermal-collecting tube inner chamber [3] lining, be applicable to the working medium that price is more expensive, with filling weight and the raising heat transfer rate that reduces working medium.
This novel evacuated thermal-collecting tube both can adopt single port formula all-glass vacuum thermal-collecting tube [1A], stick with glue agent [4] sealing is gluedd joint notes mouth [7] on the band end [6], a upper end and the end [6] metal tube [5] at its oral area [10], also can adopt straight through type all glass vacuum thermal-collecting tube [1B], stick with glue the metal tube [5] that the band end [6] is gluedd joint in each sealing of agent [4] at its two ends oral area [10], wherein have on the metal tube [5] its end [6] to have liquid injecting mouth [7], be applicable to that heating drives the air that stores up in the air space [8].
At at the end [6] of this its metal tube of novel evacuated thermal-collecting tube [5], pressed from both sides the flat sealing of freezing after both can having welded a liquid injecting mouth [7] vacuum pumping liquid injection, it is applicable to selects for use the higher liquid of boiling point as working medium, for example boiling point is the ethanol that 100 ℃ water or boiling point are 78.3 ℃, it is during corresponding to 70 ℃ of solar water heater or solar heating engineering system heat production in summer water maximum temperatures, the saturated vapour pressure of this working medium is still less than the compressive resistance 1MPa of all-glass vacuum thermal-collecting tube, and make solar water heater and solar heating engineering system adopt ball-cock assembly to intake automatically from design in use, or the solar heating engineering system then adopted the pump forced circulation, to guarantee the not empty solarization of novel evacuated thermal-collecting tube, when in solar water heater or the solar heating engineering system during lack of water, adopt the warning system and Cao Seats is covered on the novel evacuated thermal-collecting tube array of blowing a whistle automatically, to guarantee the not empty solarization of novel evacuated thermal-collecting tube, also can go up a safety valve [7] is installed at the metal tube [5] its end [6] of novel evacuated thermal-collecting tube, it is applicable to selects for use the lower liquid of boiling point as working medium, for example boiling point is the ether that 58 ℃ acetone or boiling point are 34.6 ℃, it is during corresponding to 70 ℃ of solar water heater or solar heating engineering system heat production in summer coolant-temperature gages, the saturated vapour pressure of this working medium still less than or approach the compressive resistance 1Mpa of all-glass vacuum thermal-collecting tube [1], when the empty solarization of contingency, then by the safety valve venting, the empty back of shining replenishes heat-transfer working medium with syringe by safety valve.Or at very long opening metal thin tube [7] of the last welding of the metal tube [5] its end [6] of novel evacuated thermal-collecting tube, do not adorn or be equipped with safety valve [7] at oral area, its length is when mounted a little less than the liquid level of solar water container or connecting pipe, so that after empty the solarization, on solar water container or connecting pipe, during water, can replenish cold water automatically as heat-transfer working medium, can guarantee again when all-glass vacuum thermal-collecting tube bursts one of breakage to novel evacuated thermal-collecting tube, can seriously not leak, can continue operation.
The safety valve of this novel evacuated thermal-collecting tube [7] both can be made up of the liquid injecting mouth [7A] that an aperture is arranged on the cylinder of garden or opening metal thin tube [7] and rubber tube [7B], and also the check valve that can be made up of valve body [7A], valve [7C], valve seat [7B], spring [7E], spring base [7F], packing ring [7D] is as safety valve [7].
The working medium of this novel evacuated thermal-collecting tube [11] both can have been selected single kind of neat liquid for use, for example distilled water, methyl alcohol, ethanol, conduction oil, acetone, ether etc., also can select mixing material for use, the wherein solution or the mixing material of two kinds of liquid of salt solution, water intaking methyl alcohol, ethanol, acetone, ether for example, its freezing point is lower than-50 ℃ or be lower than locality-territory of use's winter minimum temperature, can not freeze during with assurance liquid refrigerant winter operation, or employing water adds anti-icing fluid or adopt water not add anti-icing fluid to south.
The liquid refrigerant of this novel evacuated thermal-collecting tube should select for use to the material of metal tube [5] example red copper or brass or aluminium alloy or stainless steel etc. or inner wall of metal tube after chemistry or electrochemical treatments as chromium plating, nickel plating or passivation, to the interior outer glass tube material of all-glass vacuum thermal-collecting tube [1], the liquid that the material of tube core [13] and support [14] thereof is not played the chemical attack effect is as working medium [1].