CN2748846Y - Automatic defrosting change-over valve - Google Patents

Abstract

The utility model discloses an automatic defrosting change-over valve for the refrigeration equipment. The valve mainly comprises a valve body, a motor and a ceramic valve core. The valve core has a motion block and a stationary block. Wherein, the stationary block has a high voltage interface and a low voltage interface connected with a compressor, an indoor interface connected with an indoor coil pipe and an outdoor interface connected with an outdoor coil pipe. The motion block is driven by the motor, comprising a high voltage slot and a low voltage slot. The high voltage interface is communicated with the high voltage slot correspondingly; the low voltage interface is communicated with the low voltage slot correspondingly. The indoor pipe interface and the outdoor pipe interface are respectively communicated with the high voltage slot and the low voltage slot correspondingly, and the corresponding relation between the indoor pipe interface and the outdoor pipe interface and the low voltage slot and the high voltage slot is changed under the rotation of the motion block. The utility model has stable change-over and good energy saving, which is suitable for defrosting of various freezers, refrigerators and ice houses in large, medium and small model.

Description

The automatic defrosting reversal valve

Technical field:

The utility model relates to a kind of automatic defrosting reversal valve that is used for refrigeration plant.

Background technology:

The automatic defrosting of refrigeration plant mainly contains dual mode at present, and a kind of is to make the commutation of refrigeration plant steam flow by solenoid directional control valve, switches to the state of heating by refrigerating state, defrosts under the state of heating; Though this Defrost mode defrosting is fast, but owing to be subjected to the influence of electromagnetic switch valve arrangement, internal leakage is bigger, clogging also happens occasionally, make the refrigerating capacity of refrigeration plant be subjected to bigger loss, generally limit the use of, if be used for small-sized refrigerator or refrigerator in the defrosting of big-and-middle-sized refrigerator or freezer, direct losses are fallen refrigerating capacity more than 40%, so be not suitable for small-sized refrigerator and refrigerator.Second kind of Defrost mode is to make compressor shutdown, by the electric heater for heating defrosting, and this mode, defrosting time is long, and power consumption is bigger, obviously is not suitable for for big-and-middle-sized refrigerator or freezer, generally only is used for small-sized refrigerator and refrigerator.For first kind of Defrost mode, is what kind of structure its solenoid directional control valve actually? we look at Figure of description Fig. 6, from this width of cloth figure as can be seen, this solenoid directional control valve is mainly by the electromagnetism guide valve, the cylinder type reversal valve, the height pressure pipe that is connected with compressor, the inner connection tube that links to each other with evaporimeter in the refrigerator cabinet, compositions such as outer connecting pipe that is connected with refrigerator cabinet external condenser and capillary, wherein there are two capillaries to link the two ends of cylinder respectively, one and high-voltage tube conducting when switching on, magnetic valve are arranged in two capillaries, make the high pressure steam flow be passed to an end of cylinder, the promotion slide block moves, and makes the vapour groove of slide block be communicated with low-voltage tube and inner connection tube (perhaps outer connecting pipe).When magnetic valve cuts off the power supply another capillary can with the high-voltage tube conducting, make the high pressure steam flow be passed to the other end of cylinder, slide block oppositely moves, the vapour groove of slide block makes low-voltage tube be communicated with outer connecting pipe (perhaps inner connection tube), realize the commutation of steam flow thus, therefore the steam pressure difference at cylinder two ends is leaned in the commutation of this valve fully, if not exclusively or not commutation phenomena of commutation will appear in pressure reduction inadequately, and all there are between piston and cylinder body leakage problem inevitably in the electromagnetism guide valve of existing solenoid directional control valve and cylinder type reversal valve, the slide block of cylinder reversal valve is plastics simultaneously, cylinder body is a metal, the two material difference, obviously there is bigger leakage, this leakage that is brought by structure is inevitable, therefore think that in this valve manufacturing industry this valve internal leakage amount all is qualified between 1000-15000ml/min, but in fact badly influenced cylinder two ends steam pressure difference, simultaneously the material of slide block adopts plastics to determine that also the heatproof value of this reversal valve can only be between-20 ℃～120 ℃, so need cooling system during final assembly.Its capillary also easily causes the phenomenon that obstruction causes commutating not exclusively or do not commutate in addition, and this has influence on defrosting effect equally.

The utility model content:

The utility model aims to provide that a kind of defrosting time is short, effective, obvious energy conservation, is adapted to the automatic defrosting reversal valve of all kinds of refrigeration plants.

The technical scheme that the utility model is taked is: the utility model comprise the high pressure tube connector that is connected with compressor and low-pressure connection tube, the evaporator joint pipe that is connected with the refrigeration indoor evaporator of refrigeration plant, with the condenser tube connector that the outer condenser of the cool room of refrigeration plant is connected, it is characterized in that the sealed valve body and the outer defrosting temperature detect switch (TDS) of this valve body that also comprise a band control chamber and carry out chamber and valve seat; There is the motor, of a band output shaft tooth to be used to control the gauge tap of motor rotational angle in the control chamber of described valve body, one by the moving fluted disc of motor output shaft cingulum, the rotating shaft of this fluted disc is adopted ceramic material and is reached by a sealing ring in the execution chamber of described valve body, and turning to by the defrosting temperature detect switch (TDS) of motor controlled; The spool that has a usefulness high technology ceramics to make in the described execution chamber, this spool has mutual nothing and leaks the motion block of fitting and one quiet, motion block has a high-pressure trough and a trough at the end face with quiet applying, there is a pressure compensation opening side, this hole make high-pressure trough in be interlinked to the outside, the motion block other end has an axis hole to be connected with the rotating shaft of fluted disc, quiet is one with the valve seat strong bond, have above them and be used to install the high pressure tube connector, low-pressure connection tube, evaporator joint pipe, the high-voltage tube interface of condenser tube connector, the low-voltage tube interface, the evaporator tube interface, the condenser tube interface, wherein high-voltage tube interface and the corresponding connection of high-pressure trough on the spool motion block, the corresponding connection of low-voltage tube interface with described trough, corresponding with high-pressure trough and the trough respectively connection of evaporator tube interface and condenser tube interface, and evaporator tube interface and condenser tube interface they and trough and high-pressure trough corresponding relation under the rotation of motion block exchange.

Operation principle of the present utility model is: after power supply rotates motor by defrosting temperature detect switch (TDS) and gauge tap, the motion block that fluted disc will drive spool rotates thereupon, the motion block of spool and quiet relative position changes, the quiet corresponding relation of going up the height indent on each interface and the motion block changed, high-low pressure interface tube on wherein quiet is distinguished the height indent on the corresponding motion block all the time, evaporator tube interface and condenser tube interface are then changed in two positions corresponding to high-pressure trough and trough, condenser interface is communicated with high-pressure trough during refrigeration, the evaporimeter interface is communicated with trough, motion block need rotate an angle condenser interface is communicated with trough when heating during defrosting, the evaporimeter interface is communicated with high-pressure trough, realizes the steam flow commutation thus.

The utility model is used for the refrigeration plant defrosting, essence is identical with first kind of Defrost mode narrating in the background technology, also be refrigeration plant to be defrosted under the state of heating by reversal valve, but the utility model automatic defrosting reversal valve and existing solenoid directional control valve have had the change of a matter, it no longer relies on the inside steam flow pressure reduction of refrigeration plant, discard piston, cylinder, capillary etc. fully and easily leaked susceptible to plugging member, and adopt the driven by motor spool to commutate, therefore regardless of the inside steam flow pressure reduction of refrigeration plant, commutation can both put in place like clockwork.The motion block of spool and quiet use high technology ceramics, their binding face can keep not having after being processed into mirror finish leaking for a long time fits, making the internal leakage amount is zero, this utility model people has been manufactured experimently a batch sample, and detect by operation and to have obtained confirmation, especially detect to confirm that by operation the defrosting that the utility model is used for small-sized refrigerator, refrigerator has demonstrated and the no commeasurable superiority of traditional electrical heated type defrosting, its defrosting time only is 30% of an electrical heating type, and power consumption is less than 20% of electrical heating type.The utility model is used for big-and-middle-sized refrigerator, and the freezer defrosting effect also obviously is better than traditional electrical magnet valve reversal valve.Therefore the utility model not only is adapted to big-and-middle-sized refrigerator, freezer, also is adapted to small-sized refrigerator, refrigerator.

The utility model is compared also with prior art and is had the following advantages:

1, spool adopts high technology ceramics, because its heat transfer property of high technology ceramics is relatively poor, the heatproof value is-198 ℃～1700 ℃ scope, welding temperature and fluid temperature (F.T.) that the utility model can be suitable for are-60～600 ℃, so need not cooling system in final assembly with when safeguarding, make to produce that efficient improves and cost is low.

2, because the utility model commutation is not subjected to the influence of inner steam pressure difference, spool is fully by driven by motor, and commutation is stable accurately fully.Therefore can be common to all kinds of big small-type refrigeration appliances, realization from the large cold storage to 500L to mutual general of 50L refrigerator, as long as the time of motor and associated electrical switch energising is once several seconds in addition, commutation finishes and promptly cuts off the power supply automatically, power consumption is few, motor and electric switch are because short frequency of utilization of working time is low, so the life-span is long simultaneously.

3, because the utility model reversal valve does not have capillary, its internal structure simply makes the flow process of vapour-liquid in valve extremely short (only passing through the height indent), do not exist in the existing solenoid directional control valve because of the easily worn part of guide valve, capillary, slide block and piston and so on and mechanical friction etc. form dirty stifled, oil is stifled, ice is stifled, stuck phenomenon, so the flow of refrigerant resistance reduces greatly, only is 0.001MPa.

In sum, the utility model not only defrosting effect is good, and energy-saving effect is remarkable, and versatility is good, is applicable to all kinds of big small-type refrigeration appliances.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 is duty lower edge Figure 1A of the utility model-A line cutaway view.

Fig. 3 is a circuit diagram of the present utility model.

Fig. 4 is another working state figure of the utility model.

Fig. 5 is the cutaway view of Fig. 4 along B-B

Fig. 6 is the reversal valve of defrosting in the existing large-scale refrigeration plant.

The specific embodiment:

With reference to Fig. 1-3, reflected concrete structure of the present utility model, this is an embodiment that is used on the refrigerator, valve body 1 adopts high-quality H68 brass or red copper die casting to form in the present embodiment, high-low pressure tube connector (2,3) and evaporimeter and condenser tube connector (4,5) then draw and form by the red copper of high-quality, the inner chamber of valve body 1 is divided into two sealed chamber by a ceramic separator with it, one is control chamber 6, one is to carry out chamber 7, in control chamber 6, a motor 61 is arranged, a gauge tap 62, a fluted disc 63, motor 61 adopts rotating speed 15 commentaries on classics/min, power is the AC220V42TYJ-F type motor of 2-5W, the output shaft tooth 611 of motor and fluted disc 63 engagements, driving this fluted disc rotates, the rotating shaft 631 of described fluted disc is stretched into by a sealing ring 8 and is carried out chamber 7, pottery is adopted in the rotating shaft 631 of fluted disc, sealing ring 8 adopts fluorine as the glue sealing ring, be fixed with two control levers (633 on the fluted disc 63,634), gauge tap 62 is installed on the shell of motor 61, by two control levers (633,634) stir, the corner that the control motor rotates is 90 °, the control of this corner also can adopt electrical equipment control as with delay chip control and the control of photoelectricity idol noncontacting switch etc. except that the control of the mechanical type stirred with this routine control lever.The rotation direction of motor 61 is by external (power supply) defrosting temperature detect switch (TDS) 9 controls, this switch is fixed on the liquid storage pipe wall in the evaporimeter, and it accepts the evaporimeter heat, gives inner bimetal leaf 95 by 94 conduction of temperature-sensitive portion, when the evaporator surface temperature rose, bimetal leaf produced distortion.When temperature reaches 10 ℃ of left and right sides, promptly oppress pin 96 movable contact 91 is disconnected in stationary contact 93, and be communicated with in another stationary contact 92, be refrigerator refrigeration work state this moment.Along with the reduction of evaporator temperature, the bimetal leaf reversal deformation of defrosting in the temperature controller, when temperature was reduced to reset temperature-5 ℃, its movable contact 91 disconnected with stationary contact 92, and is communicated with in another stationary contact 93, and heat duty for refrigerator this moment.A spool 71 made from the high technology ceramics material is arranged in the execution chamber 7 of described valve body, this spool has 711 1 quiet 712 of motion blocks, the binding face of the two is processed into mirror finish, make not have between the two to leak and fit, the end face with quiet applying of motion block 711 has a high-pressure trough 713 and a trough 714 that is parallel to each other, there is a pressure compensation opening 715 side, this hole make high-pressure trough 713 in be interlinked to the outside; Motion block 711 other ends have an axis hole 716 to be connected with the rotating shaft 631 of fluted disc, thereby can rotate with this rotating shaft, and are with spring 632 in the rotating shaft of fluted disc.Quiet 712 valve seat 10 with valve body reinforced and is bonded as one, have the high voltage interface of connecting with high pressure tube connector 2 21 above them, low-voltage interface 31 with low-pressure connection tube 3 connections, evaporimeter interface 41 with evaporator joint pipe 4 connections, condenser interface 51 with 5 connections of condenser tube connector, the line of centres of these four interfaces becomes a rectangle substantially, all corresponding to the height indent (713 on the motion block 711,714), wherein high voltage interface 21 all the time with high-pressure trough 713 corresponding connections, low-voltage interface 31 all the time with trough 714 corresponding connections, evaporimeter interface 41 and condenser interface 51 respectively with high-pressure trough 713 or trough 714 corresponding connections.In conjunction with Fig. 2 and Fig. 4 high-pressure trough 713 on these interfaces and the motion block and the space bit relation of trough 714 as can be seen.During work, refrigerator freezes if desired, referring to Fig. 1 and Fig. 3, the temperature controller switch 9 that defrosts this moment is in the refrigeration shelf position, movable contact 91 is communicated with power supply and gives motor coil termination contact 611 with stationary contact 92, the stationary contact 621 that is connected to gauge tap 62 by motor coil end tail contact 613 extremely common junction 622 is got back to power supply, form a complete motor current supply circuit, motor is rotated, driving lower tooth disk at motor 61 turns clockwise, spool motion block 711 is along with rotation, behind 90 ° of arrival predetermined angulars, control lever 633 is stirred the common junction 622 on the gauge tap 62, make it and stationary contact 621 disconnections (stationary contact 623 is connected), thereby stop the running of motor, making ceramic cartridge 71 be in first operating position shown in Figure 1 is refrigerating state, this moment, condenser interface 51 was communicated with high-pressure trough 713, evaporimeter interface 41 is communicated with (see figure 2) with trough 714, high temperature by the compressor discharge, the high pressure gas enters high-voltage tube 2 and flow into high-pressure trough 713 in the ceramic cartridge 71, flowing to the refrigerator external condenser through condenser tube connector 5 dispels the heat, become subcooled liquid after the condensation process, flow to the evaporator joint pipe 4 of flowing through after the evaporation heat-soak treatment becomes overheated gas in the evaporimeter in the refrigerator through the capillary-compensated step-down then and enter trough 714, return in the compressor after flowing to low-pressure connection tube 3 again, thereby finish this time kind of refrigeration cycle process.Referring to Fig. 4 and Fig. 5, when refrigerator need defrost when heating, the defrosting temperature controller can switch to movable contact 91 stationary contact 93 automatically and promptly enter defrosting and heat shelves, motor coil termination contact 612 is given in power supply, stationary contact 623 to the common junction 622 that is connected to gauge tap 62 by motor coil tail end contact 614 is got back to power supply, form a complete motor current supply circuit, the motor backward rotation, fluted disc 63 counterclockwise rotating band active toothed disk control lever 634 under the driving of motor 61 is stirred gauge tap 62, make control lever 634 and stationary contact 623 disconnect (stationary contact 621 is connected), thereby stop the running of motor, spool motion block 711 is got back to original position, it and quiet relative position relation is seen shown in Figure 4, this moment, evaporimeter interface 41 was communicated with high-pressure trough 713, condenser interface 51 is communicated with trough 714, make spool 71 be in second operating position state of heating that promptly defrosts, the high temperature that discharge from compressor this moment, the high-pressure trough 713 of high pressure gas in high-voltage tube 2 flow into ceramic cartridge 71 flows to evaporator joint pipe 4 that evaporimeter dispels the heat in the refrigerator, become subcooled liquid after the condensation process, in being depressured to the refrigerator external condenser, capillary-compensated evaporates then, heat-soak treatment becomes behind the overheated gas trough in condenser tube connector 5 enters ceramic cartridge 71 714 again, returns behind the low-voltage tube 3 of flowing through at last finishing thus in the compressor once that defrosting heats cyclic process.The utility model is used for freezer, large, medium and small refrigerator is the same with the above-mentioned refrigerator that is used for, can be general.

Claims (1)

1, a kind of automatic defrosting reversal valve, it comprise the high pressure tube connector (2) that is connected with compressor and low-pressure connection tube (3), the evaporator joint pipe (4) that is connected with the refrigeration indoor evaporator of refrigeration plant, with the condenser tube connector (5) that the outer condenser of the cool room of refrigeration plant is connected, it is characterized in that: also comprise a band control chamber (6) and carry out the sealed valve body of chamber (7) and valve seat and this valve body the is outer temperature detect switch (TDS) (9) that defrosts; There is the motor (61), of a band output shaft tooth (611) to be used to control the gauge tap (62) of motor rotational angle in the control chamber (6) of described valve body, one fluted disc (63) by motor output shaft tooth (611) drive, the rotating shaft of this fluted disc (631) is adopted ceramic material and is reached in the execution chamber (7) of described valve body by a sealing ring (8), and turning to by defrosting temperature detect switch (TDS) (9) of motor (61) controlled; The spool (71) that has a usefulness high technology ceramics to make in the described execution chamber (7), this spool has mutual nothing and leaks a motion block (711) and quiet (712) of fitting, motion block has a high-pressure trough (713) and a trough (714) at the end face with quiet applying, there is a pressure compensation opening (715) side, this hole make high-pressure trough (713) in be interlinked to the outside, motion block (711) other end has an axis hole (716) to be connected with the rotating shaft (631) of fluted disc, quiet (712) are one with valve seat (10) strong bond, have above them and be used to install high pressure tube connector (2), low-pressure connection tube (3), evaporator joint pipe (4), the high-voltage tube interface (21) of condenser tube connector (5), low-voltage tube interface (31), evaporator tube interface (41), condenser tube interface (51), the wherein corresponding connection of high-pressure trough (713) on high-voltage tube interface (21) and the spool motion block (711), low-voltage tube interface (21) and the corresponding connection of described trough (714), evaporator tube interface (41) and condenser tube interface (51) respectively with high-pressure trough (713) and the corresponding connection of trough (714), and evaporator tube interface (41) and condenser tube interface (51) they and trough (714) and high-pressure trough (713) corresponding relation under the rotation of motion block (711) exchange.

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