CN204313537U - A kind of low-temperature insulation type dry evaporator - Google Patents
A kind of low-temperature insulation type dry evaporator Download PDFInfo
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- CN204313537U CN204313537U CN201420794866.XU CN201420794866U CN204313537U CN 204313537 U CN204313537 U CN 204313537U CN 201420794866 U CN201420794866 U CN 201420794866U CN 204313537 U CN204313537 U CN 204313537U
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Abstract
The utility model discloses a kind of low-temperature insulation type dry evaporator, comprise housing, many heat exchanger tubes are installed in described housing, heat exchanger tube forms the tube side as refrigerant passage, the outside shell side then forming chilled water passage of heat exchanger tube in housing, described housing exterior walls is provided with the heater for heating frozen water, and the temperature threshold be provided with according to setting starts or closes the temperature detect switch (TDS) of heater.The utility model realizes the icing phenomenon avoided after unit quits work in dry evaporator, guarantees that dry evaporator shell-side temperature remains on more than 2 DEG C less than 5 DEG C, and the utility model structure is simple, consumes energy low.
Description
Technical field
The utility model relates to the field of heat exchangers of nuclear power air-conditioning system, particularly relates to a kind of low-temperature insulation type dry evaporator.
Background technology
" Nuclear Safety planning (2011-2020) " and " nuclear power Long-and Medium-term Development planning (2011-2020) " (Executive Meeting of the State Council on October 24 in 2012 is again discussed and passed through to implement) has explicitly pointed out China's " new nuclear power unit must meet three generations's safety standard ".The topmost feature of three generations's nuclear power technology is the design concept that security system adopts " non-active ".
Non-active nuclear power plant central chilled water system (VWS) is one of nuclear power plant's air-conditioning system nucleus equipment with cooling by wind, unit requires whole year operation refrigeration, for nuclear power plant's air-treatment unit, modular cooling unit with take chilled water as the chilled water that the process equipment of cooling medium provides 4.4 DEG C.Require that minimum safe environment temperature is-40 DEG C in non-active nuclear power plant standard site parameters, namely unit requires the normal cooling activation of energy under-40 DEG C of environmental working conditions, and can stable operation.
At present, on market, the minimum refrigerating operaton environment temperature of cooling by wind is-19 DEG C, not yet has the product that can meet-40 DEG C of environment temperature refrigerating operatons.And being mostly dry evaporator (horizontal pipe shell type structure) for the evaporimeter of the cooling by wind (refrigeration unit) of low temperature environment, tube side walked by cold-producing medium, and chilled water walks shell side, the heat-preservation cotton that outer surface parcel 20mm is thick.When cooling by wind is shut down at-40 DEG C of low temperature environments, dry evaporator can be influenced by ambient temperature and chilled water is frozen, and endangers the heat exchanger tube in housing, heat exchanger tube can be caused to break, thus cause evaporimeter to lose efficacy time serious.
Application number be 200620051158.2 Chinese patent " dry evaporator " disclose a kind of dry evaporator and comprise refrigerant tubing and cooling water loop, enter in the water of dry evaporator inner refrigerant pipeline one end 10 ~ 30mm at distance cold-producing medium, add a temperature sensor, it can detect the water temperature near cold-producing medium upstream end in dry evaporator, once detected temperatures lower than settings, controller controls compressor and quits work, and magnetic valve disconnects the feed lines cutting off cold-producing medium and avoids dry evaporator to freeze.The dry evaporator that this patent provides is applied in general field, is not suitable for the working environment of-40 DEG C of low temperature, and existing technology does not relate to the ice formation issues solving dry wet evaporimeter under the working environment of-40 DEG C of low temperature.
The problem that existing patent will solve is frozen because refrigerant makes chilled water lower the temperature, and then freezing evaporimeter, so the technical scheme adopted is exactly close refrigerant when monitoring chilled water temperature and being too low, and existing patent comprises other prior aries and do not provide and cause chilled water to freeze because ambient temperature is too low and then any solution of freezing evaporimeter, so be badly in need of development, a kind of to overcome external temperature too low and make the effective technology scheme that in evaporimeter, chilled water is icing.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of low-temperature insulation type dry evaporator, when ensureing to shut down under the low temperature environment of-40 DEG C, can not be influenced by ambient temperature and chilled water is frozen, and and then protect whole refrigeration system.
Above-mentioned purpose of the present utility model is achieved by following technical solution:
A kind of low-temperature insulation type dry evaporator, comprise housing, many heat exchanger tubes are installed in described housing, heat exchanger tube forms the tube side as refrigerant passage, the outside shell side then forming chilled water passage of heat exchanger tube in housing, described housing exterior walls is provided with the heater for heating frozen water, and the temperature threshold be provided with according to setting starts or closes the temperature detect switch (TDS) of heater.Described temperature threshold is 2 ~ 5 DEG C.Dry evaporator described in the utility model is used in the refrigeration unit such as nuclear power air-conditioning system main frame; when refrigeration unit is shut down at-40 DEG C of low temperature environments; dry evaporator is subject to ambient temperature effect and makes the chilled water water temperature drop in this evaporimeter; by adding heater at housing exterior walls; chilled water in dry evaporator can not be produced freeze, solve prior art Problems existing.Described chilled water is clean fresh water.
Preferably, described heater is that housing exterior walls is tied with one or one or more electric-heating belt, and described electric-heating belt is wound around in the shape of a spiral.Spiral wound makes homogeneous heating.
Further, described temperature detect switch (TDS) is 3, is located at the position in the middle of the water inlet end of close described housing, water side and housing respectively.Described temperature detect switch (TDS) obtains enclosure interior temperature by setting up diverse location separately.
Described inner walls is interval with multiple deflection plate up and down successively.Described polylith deflection plate makes chilled water current turbulization to strengthen heat exchange.
The minimum temperature position of housing is located at by described temperature detect switch (TDS), and described minimum temperature position is the flow dead that chilled water is formed through multiple deflection plate.Can flow dead be there is in current through deflection plate; in flow dead; when refrigeration unit is shut down; keep dry evaporator chilled-water flow constant; but affect by low ambient temperature; in housing, flow dead chilled water temperature can reduce further, and therefore, the shell position near close chilled water flow dead is the position that the temperature of housing is minimum.
The coated heat-preservation cotton of described hull outside.Described heat-preservation cotton can play auxiliary insulation and be convenient to the effect that electric-heating belt carries out accurately control.Preferably, described heat-preservation cotton is the rubber and plastic heat-preservation cotton that 60mm is thick.
Further, housing two ends are provided with tube sheet, and the outside of tube sheet is fixedly connected with left end cap and right end cap respectively, and described left end cap is provided with refrigerant import and refrigerant exit.Be provided with water inlet on the downside of described shell one end, on the upside of the described housing other end, be provided with delivery port.Water inlet and delivery port are that its end is provided with adpting flange, for connecting water pipe by the water pipe be communicated with described housing that described housing is drawn.Refrigerant is entered each heat exchanger tube in housing by refrigerant import, by refrigerant exit flowed out after carrying out heat exchange in housing with chilled water; Chilled water enters housing by water inlet, and flows out from delivery port after carrying out heat exchange with heat exchanger tube.
Described water outlet is provided with housing temperature sensor.Described housing temperature sensor is for detecting the temperature of the chilled water in housing.
The below of described housing is provided with the base for support housing, described base comprises two symmetrically arranged base units, each base unit comprises support plate, connecting plate and base plate, described support plate is curved fits with housing exterior walls, described area supported is fixedly connected with two the connecting plate upper ends be arranged in parallel, described connecting plate lower end is fixedly connected with base plate, the symmetrical installing hole had for construction bolt on described base plate.
After refrigeration unit is shut down, closed when the chilled water water temperature <2 DEG C in dry evaporator being detected when temperature detect switch (TDS), heater is started working heated shell; Disconnect when the water temperature >5 DEG C in dry evaporator being detected when temperature detect switch (TDS), then heater stop work.
Further, when refrigeration unit is shut down, housing temperature sensor detects temperature <2 DEG C of chilled water in described dry evaporator housing and continue for 10 minutes, then output alarm signal, and prompting heater breaks down, and needs repairing.
Further, freezing unit, when normal work, arranges heating-stopping apparatus work, even if electric-heating belt temperature detect switch (TDS) is closed all cannot start heater.Housing temperature sensor also cannot work, and does not have alarm signal and exports, in order to avoid heating devices heat housing causes the impact of chilled water leaving water temperature and not energy-conservation.
Particularly, described electric-heating belt power demand calculates according to following methods:
First housing thermal loss Qp=Δ T × Ki × Qa is calculated;
In formula: Δ T is the temperature difference (=Tm-Ta) between housing holding temperature Tm and minimum environment temperature Ta;
Ki insulation material coefficient, tables look-up according to heat-preservation cotton material;
Qa heat loss factor, tables look-up according to housing outer diameter and heat-preservation cotton thickness;
Secondly from power-temperature characteristics, select the power stage Qh of accompanying-heat cable, its value should be equal to or greater than the thermal loss Qp of housing.
Compared with prior art, the beneficial effects of the utility model are as follows:
The utility model controls unlatching or the closedown of the heater be arranged on housing by temperature detect switch (TDS), realize the icing phenomenon avoided after unit quits work in dry evaporator, guarantee that dry evaporator shell-side temperature remains on more than 2 DEG C less than 5 DEG C, the utility model structure is simple, consumes energy low.
Accompanying drawing explanation
Figure 1 shows that the structural schematic block diagram of refrigeration unit;
Figure 2 shows that the utility model perspective view;
Figure 3 shows that the dry evaporator side broken section structural representation shown in Fig. 2;
Figure 4 shows that flow dead schematic diagram during chilled water flowing in dry evaporator.
Wherein, 1, housing; 2, heat exchanger tube; 3, heat-preservation cotton; 4, electric-heating belt; 5, base unit; 11, tube sheet; 12, left end cap; 13, right end cap; 14, water inlet; 15, delivery port; 16, temperature detect switch (TDS); 17, deflection plate; 51, gripper shoe; 52, connecting plate; 53, base plate; 100, dry evaporator; 121, refrigerant import; 122, refrigerant exit.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment the utility model made and elaborating further, but embodiment does not limit in any form the utility model.
Embodiment 1
As shown in Figure 1, refrigeration unit comprises control system and successively by compressor, condenser, expansion valve and dry evaporator that pipeline connects, the refrigerant exit end of described dry evaporator is connected by pipeline with the arrival end of described compressor.Described control system is for controlling the operation of refrigeration unit; Described compressor is used for low-temp low-pressure gaseous coolant (being also snow kind) boil down to HTHP refrigerant; The described condenser high pressure gaseous refrigerant be used for by being discharged by described compressor with heat exchange with outside lower the temperature becomes cryogenic high pressure liquid state or gas-liquid mixture; Described expansion valve is used for the cryogenic high pressure refrigerant step-down of liquid state or the gas-liquid mixture phase of being discharged by condenser, and described dry evaporator is used for that low-temp low-pressure liquid refrigerants is absorbed heat and is vaporizated into low-temp low-pressure gaseous coolant.In figure, arrow is depicted as the direction of refrigerant flowing.
As Fig. 2, shown in 3, described dry evaporator 100, comprise housing 1(cylindrical), be arranged on the many heat exchanger tubes 2 in housing 1, housing 1 two ends are provided with tube sheet 11, the outside of tube sheet 11 is fixedly connected with left end cap 12 and right end cap 13 respectively, described left end cap is provided with refrigerant import 121 and refrigerant exit 122, refrigerant import is positioned at below, described housing is provided with water inlet 14 and delivery port 15, water inlet and delivery port are by the water pipe be communicated with described housing that described housing is drawn, its end is provided with adpting flange, for connecting water pipe, water inlet 14 is positioned at below, left side, delivery port is positioned at top, right side, outside described housing 1, coated heat-preservation cotton 3(is for ease of diagram, in figure, part heat-preservation cotton is only shown, in fact the coated whole dry evaporator of heat-preservation cotton), described housing 1 outer wall is tied with electric-heating belt 4, described electric-heating belt 4 is wound around in the shape of a spiral, make being heated of housing more even like this.Described housing 1 is provided with the electric-heating belt temperature detect switch (TDS) 16 for controlling described electric-heating belt 4.Refrigerant is entered each heat exchanger tube in housing by refrigerant import 121, by refrigerant exit 122 flowed out after carrying out heat exchange in housing with chilled water; Chilled water enters housing by water inlet 14, and flows out from delivery port 15 after carrying out heat exchange with heat exchanger tube.
Particularly, the position of the minimum temperature of housing is located at by described electric-heating belt temperature detect switch (TDS) 16.As shown in Figure 4; being provided with some deflection plates 17 in housing 1 makes chilled water flow turbulization to strengthen heat exchange; but can flow dead be there is in current when deflection plate 17; in flow dead; when refrigeration unit is shut down; keep dry evaporator 100 chilled-water flow constant; but affect by low ambient temperature; in housing 1, flow dead chilled water temperature can reduce further; therefore; shell position near close chilled water flow dead is the position that the temperature of housing is minimum, and this position is located at by electric-heating belt temperature detect switch (TDS) 16.
Particularly, described electric-heating belt temperature detect switch (TDS) 16 has 3, is located at the position in the middle of the water inlet end of close described housing, water side and housing respectively.
Further; described housing 1 is provided with housing temperature sensor near delivery port 15 place; when refrigeration unit is shut down; housing temperature sensor 18 detects that temperature <2 DEG C of chilled water in described dry evaporator 100 housing 1 continue for 10 minutes; then output alarm signal; prompting electric-heating belt 4 breaks down, and needs repairing or changes.
Freezing unit, when normal work, arranges and stops electric-heating belt 4 to work, even if electric-heating belt temperature detect switch (TDS) 16 is closed all cannot start electric-heating belt 4.Housing temperature sensor 18 also cannot work, and does not have alarm signal and exports, in order to avoid electric-heating belt 4 heated shell 1 causes the impact of freezing or fresh water outlet temperature and not energy-conservation.
Particularly, described heat-preservation cotton is the rubber and plastic heat-preservation cotton that 60mm is thick.Auxiliary insulation can be played and be convenient to the effect that electric-heating belt 4 carries out accurately control.
The below of housing 1 is provided with the base for support housing, base comprises two symmetrically arranged base units 5, each base unit 5 comprises support plate 51, connecting plate 52 and base plate 53, support plate 51 is curved, the outer wall of recessed upper surface and housing 1 is fitted, and stably can hold whole housing 1, and support plate 51 lower surface is fixedly connected with connecting plate 52 upper end, connecting plate 52 lower end is fixedly connected with base plate 53, the symmetrical installing hole had for construction bolt on base plate 53.
After refrigeration unit is shut down, closed when the chilled water water temperature <2 DEG C in dry evaporator 100 being detected when temperature detect switch (TDS) 16, electric-heating belt 4 is started working heated shell; Disconnect when the water temperature >5 DEG C in dry evaporator being detected when temperature detect switch (TDS) 16, then electric-heating belt 4 quits work.
Further, when refrigeration unit is shut down, housing temperature sensor detects temperature <2 DEG C of chilled water in described dry evaporator housing and continue for 10 minutes, then output alarm signal, and prompting electric-heating belt 4 breaks down, and needs repairing.
Particularly, described electric-heating belt 4 power demand calculates according to following methods:
First housing thermal loss Qp=Δ T × Ki × Qa is calculated;
In formula: Δ T is the temperature difference (=Tm-Ta) between housing holding temperature Tm and minimum environment temperature Ta;
Ki insulation material coefficient, tables look-up according to heat-preservation cotton material;
Qa heat loss factor, tables look-up according to housing outer diameter and heat-preservation cotton thickness;
Secondly from power-temperature characteristics, select the power stage Qh of accompanying-heat cable, its value should be equal to or greater than the thermal loss Qp of housing.
In above-mentioned control method, freezing unit, when normal work, arranges and stops electric-heating belt 4 to work, even if electric-heating belt temperature detect switch (TDS) 16 is closed all cannot start electric-heating belt 4.Housing temperature sensor 18 also cannot work, and does not have alarm signal and exports, in order to avoid electric-heating belt 4 heated shell 1 causes the impact of chilled water leaving water temperature and not energy-conservation.
Claims (10)
1. a low-temperature insulation type dry evaporator, comprise housing, many heat exchanger tubes are installed in described housing, heat exchanger tube forms the tube side as refrigerant passage, the outside shell side then forming chilled water passage of heat exchanger tube in housing, it is characterized in that, described housing exterior walls is provided with the heater for heating frozen water, and the temperature threshold be provided with according to setting starts or closes the temperature detect switch (TDS) of heater.
2. low-temperature insulation type dry evaporator according to claim 1, it is characterized in that, described heater is that housing exterior walls is tied with one or one or more electric-heating belt, and described electric-heating belt is wound around in the shape of a spiral.
3. low-temperature insulation type dry evaporator according to claim 1, it is characterized in that, described inner walls is interval with multiple deflection plate up and down successively, and described deflection plate makes chilled water turbulization.
4. low-temperature insulation type dry evaporator according to claim 1, it is characterized in that, described temperature detect switch (TDS) is 3, is located at the position in the middle of the water inlet end of described housing, water side and housing respectively.
5. low-temperature insulation type dry evaporator according to claim 3, it is characterized in that, the minimum temperature position of housing is located at by described temperature detect switch (TDS), and described minimum temperature position is the flow dead that chilled water is formed through multiple deflection plate.
6. low-temperature insulation type dry evaporator according to claim 1, is characterized in that, the coated heat-preservation cotton of described hull outside.
7. low-temperature insulation type dry evaporator according to claim 1, it is characterized in that, housing two ends are provided with tube sheet, and the outside of tube sheet is fixedly connected with left end cap and right end cap respectively, and described left end cap is provided with refrigerant import and refrigerant exit.
8. low-temperature insulation type dry evaporator according to claim 1, is characterized in that, be provided with water inlet on the downside of described shell one end, be provided with delivery port on the upside of the described housing other end.
9. low-temperature insulation type dry evaporator according to claim 8, it is characterized in that, described water outlet is provided with housing temperature sensor.
10. low-temperature insulation type dry evaporator according to claim 1, it is characterized in that, the below of housing is provided with the base for support housing, described base comprises two symmetrically arranged base units, each base unit comprises support plate, connecting plate and base plate, described support plate is curved fits with housing exterior walls, described area supported is fixedly connected with two the connecting plate upper ends be arranged in parallel, described connecting plate lower end is fixedly connected with base plate, the symmetrical installing hole had for construction bolt on described base plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420794866.XU CN204313537U (en) | 2014-12-17 | 2014-12-17 | A kind of low-temperature insulation type dry evaporator |
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| CN201420794866.XU CN204313537U (en) | 2014-12-17 | 2014-12-17 | A kind of low-temperature insulation type dry evaporator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390394A (en) * | 2014-12-17 | 2015-03-04 | 广东申菱空调设备有限公司 | Low-temperature heat-preservation type dry evaporator and control method thereof |
| CN104964488A (en) * | 2015-07-04 | 2015-10-07 | 杨海良 | Evaporator with steam pipe refrigeration device |
-
2014
- 2014-12-17 CN CN201420794866.XU patent/CN204313537U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390394A (en) * | 2014-12-17 | 2015-03-04 | 广东申菱空调设备有限公司 | Low-temperature heat-preservation type dry evaporator and control method thereof |
| CN104390394B (en) * | 2014-12-17 | 2016-10-26 | 广东申菱环境系统股份有限公司 | A kind of low-temperature insulation type dry evaporator and control method thereof |
| CN104964488A (en) * | 2015-07-04 | 2015-10-07 | 杨海良 | Evaporator with steam pipe refrigeration device |
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Address after: 528313 Shunde City, Foshan province Chencun town machinery and equipment Park, No. ten, No. Road, No. 8 Patentee after: GUANGDONG SHENLING AIR-CONDITIONING EQUIPMENT CO., LTD. Address before: 528313 Shunde City, Foshan province Chencun town machinery and equipment Park, No. ten, No. Road, No. 8 Patentee before: Guangdong Shenling Air Conditioning Equipment Co., Ltd. |