CN207570150U - Freezer ammonia refrigeration system with hot ammonia defrosting circuit - Google Patents

Abstract

A kind of freezer ammonia refrigeration system with hot ammonia defrosting circuit, including high pressure ammonia storage tank, throttle valve, low pressure recycle bucket, ammonia pump, evaporator, refrigeration compressor, condenser, jettison gear, hot ammonia defrosting circuit；The jettison gear of the utility model setting can effectively discharge the oil deposited in low pressure recycle bucket, effectively prevent the refrigeration performance that oil enters evaporator and influences Ammonia Refrigerating Equipment；Hot ammonia defrosting circuit can coordinate jettison gear to remove the oil for entering evaporator on a small quantity, further improve the heat transfer property of evaporator, and hot ammonia defrosting circuit can also be effectively to evaporator plate pipe outer wall defrosting, and then improves the heat transfer efficiency of evaporator, improves equipment refrigeration performance；The present apparatus is by jettison gear and hot ammonia defrosting circuit respectively from inside and outside while evaporator refrigeration performance of eliminating the effects of the act influence factor, and compared with simple utilization jettison gear or hot ammonia defrosting circuit, the refrigeration effect and refrigeration stability of equipment are more preferable.

Description

Freezer ammonia refrigeration system with hot ammonia defrosting circuit

Technical field

The utility model is related to Ammonia Refrigerating Equipment technical field, more particularly to a kind of freezer ammonia with hot ammonia defrosting circuit Refrigeration system.

Background technology

The low pressure recycle bucket of cold storage refrigerating system is particularly the low pressure recycle bucket as drain bucket, after long-time service, all Different degrees of appearance long-pending oil phenomenon, upper liquid occurs difficult when starting ammonia pump, influences the normal operation of system and storehouse cooling； Be provided with drain line in the prior art, at low temperature, viscosity increase, mobility is very poor for refrigeration oil, deposition by by gravity from Stream, long-term contamination precipitation mixes with oil in addition, and oil in low pressure recycle bucket is caused not put not come out, when refrigeration oil enters ammonia pump Afterwards, ammoniacal liquor show bubble, ammonia pump upper liquid is also more difficult, and oil, which enters system rear class evaporator, can influence equipment refrigeration performance；In addition, After the throttling of high pressure ammoniacal liquor, generate a kind of two-phase mixture being made of flash gas, liquefied ammonia and oily particle penetrates oily movement, makes bucket Interior liquid phase part generates eddy motion, so that liquefied ammonia cannot be layered quickly with oily particle, even if oil exit pipe oil extraction is smooth In the case of still have a small amount of oil and squeezed into evaporator by ammonia pump, make the heat exchange efficiency of evaporator reduce；Further more, freezer The heat transfer that refrigeration system can generate frost layer and largely effect on evaporator in evaporator serpentine coil outer wall after a period of use is imitated Fruit, the defrosting method used at present are mainly nature defrosting method, and the method defrosting time is long and defrosting is not thorough, therefore influences whole The heat-transfer effect of a ammonia refrigeration system, and a small amount of oil into inside evaporator coil cannot be removed, it can equally influence equipment system Cold performance.

Invention content

In view of this, against the above deficiency, it is necessary to propose it is a kind of can effectively improve ammonia refrigeration system refrigeration performance and The freezer ammonia refrigeration system with hot ammonia defrosting circuit that refrigeration performance is stablized.

A kind of freezer ammonia refrigeration system with hot ammonia defrosting circuit, including high pressure ammonia storage tank, throttle valve, low pressure recycle Bucket, ammonia pump, evaporator, refrigeration compressor, condenser, jettison gear, hot ammonia defrosting circuit；The high pressure ammonia storage tank is equipped with height Hydraulic fluid ammonia entrance, high-pressure liquid ammonia outlet；The high-pressure liquid ammonia outlet is connected with the entrance of throttle valve, is exported in the high-pressure liquid ammonia First shut-off valve of control high pressure ammonia storage tank output, the low pressure recycle bucket annular sidewall are installed between the entrance of throttle valve Lower part both sides be respectively equipped with low pressure liquefied ammonia entrance, low pressure liquefied ammonia outlet, the top of the low pressure recycle bucket annular sidewall Both sides are respectively equipped with ammonia return air inlet, ammonia return air outlet, and the outlet of the throttle valve is connected with low pressure liquefied ammonia entrance, in institute It states and the second shut-off valve is installed between the outlet of throttle valve and low pressure liquefied ammonia entrance, the ammonia pump setting and low pressure recycle pump Lower section, the low pressure liquefied ammonia outlet and the outlet of ammonia pump, the outlet of the ammonia pump are connected with the entrance of evaporator, Third shut-off valve, the outlet of the evaporator and the ammonia are installed between the outlet of the ammonia pump and the entrance of evaporator Return air inlet connects, and the ammonia return air outlet is connected with the entrance of the refrigeration compressor, the outlet of the refrigeration compressor It is connected with the entrance of the condenser, the 4th cut-off is installed between the outlet of the refrigeration compressor and the entrance of condenser Valve, the outlet of the condenser are connected with the high-pressure liquid ammonia entrance, and the bottom of the low pressure recycle bucket is additionally provided with oil discharge outlet, institute It states jettison gear and includes oil removing pot, the oil removing pot is installed on the lower section of the oil discharge outlet of low pressure recycle bucket, and the oil discharge outlet is with removing The entrance connection of roof, equipped with the 5th shut-off valve between the oil discharge outlet and oil storage tank, in the bottom of the oil removing pot Oil-drain pipe is installed, the 6th shut-off valve is installed in the free end of the oil-drain pipe, is also set in the ring wall of the oil removing pot There is back blow port, the back blow port is connected by the pipeline connected between blowback pipeline and ammonia pump and third shut-off valve, described 7th shut-off valve is installed on blowback pipeline；The hot ammonia defrosting circuit is condensed with the superheated steam using refrigeration compressor discharge When the heat released melt the frost layer of evaporator surface；The hot ammonia defrosting circuit includes defrosting pipeline, the 8th shut-off valve, described Pipeline between one end of defrosting pipeline and the 4th shut-off valve and the entrance of condenser connects, the defrosting pipeline it is another End is connected with the pipeline between the third shut-off valve and the entrance of evaporator, and the 8th cut-off is equipped on the defrosting pipeline Valve.

Preferably, wave blocking plate is provided in the defrosting pipeline, the wave blocking plate is inserted vertically in defrosting pipeline, institute Two opposite sides for stating wave blocking plate are not connected to defrosting inner wall of the pipe.

Preferably, it is provided with to enter for the shower water for being passed through defrosting hot water in evaporator at the top of the evaporator Mouthful, discharge outlet is equipped in the bottom of the evaporator, the shower water is connected by pipeline with defrosting hot water source, in the spray Soft brush treatment device is installed between water drenching entrance and defrosting hot water source.

The jettison gear of the utility model setting can effectively discharge the oil deposited in low pressure recycle bucket, effectively prevent oil into Enter evaporator and influence the refrigeration performance of Ammonia Refrigerating Equipment；Hot ammonia defrosting circuit can coordinate jettison gear to remove and enter evaporation on a small quantity The oil of device further improves the heat transfer property of evaporator, and hot ammonia defrosting circuit can also effectively rush evaporator plate pipe outer wall Frost, and then the heat transfer efficiency of evaporator is improved, improve equipment refrigeration performance；The present apparatus passes through jettison gear and hot ammonia defrosting From inside and outside while evaporator refrigeration performance of eliminating the effects of the act influence factor, jettison gear or heat are utilized with simple respectively for circuit Ammonia defrosting circuit is compared, and the refrigeration effect and refrigeration stability of equipment are more preferable.

Description of the drawings

Fig. 1 is the structure diagram of the freezer Ammonia Refrigerating Equipment for being provided with improvement type jettison gear.

Fig. 2 is the defrosting pipeline section schematic diagram for being equipped with wave blocking plate.

Fig. 3 is the structure diagram for the evaporator for being equipped with demineralized water treatment device.

In figure：High pressure ammonia storage tank 10, high-pressure liquid ammonia entrance 11, high-pressure liquid ammonia export the 12, first shut-off valve 13, throttle valve 20th, low pressure recycle bucket 30, low pressure liquefied ammonia entrance 31, low pressure liquefied ammonia outlet 32, ammonia return air inlet 33, ammonia return air outlet 34, Second shut-off valve 35, oil discharge outlet 36, ammonia pump 40, evaporator 50, third shut-off valve 51, spray water inlet 52, discharge outlet 53, punching White hot water source 54, refrigeration compressor 60, the 4th shut-off valve 61, condenser 70, jettison gear 80, removes soft brush treatment device 55 Oil tank 81, the 5th shut-off valve 811, oil-drain pipe 812, the 6th shut-off valve 813, back blow port 814, blowback pipeline the 815, the 7th end Valve 816, hot ammonia defrosting circuit 90, defrosting pipeline 91, the 8th shut-off valve 92, wave blocking plate 93.

Specific embodiment

It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment Attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the utility model, for this For the those of ordinary skill of field, without creative efforts, others are can also be obtained according to these attached drawings Attached drawing.

Referring to Fig. 1, the utility model embodiment provides a kind of freezer ammonia refrigeration for being provided with improvement type jettison gear and sets It is standby, including high pressure ammonia storage tank 10, throttle valve 20, low pressure recycle bucket 30, ammonia pump 40, evaporator 50, refrigeration compressor 60, condensation Device 70, jettison gear 80, hot ammonia defrosting circuit 90；High pressure ammonia storage tank 10 is equipped with high-pressure liquid ammonia entrance 11, high-pressure liquid ammonia outlet 12； High-pressure liquid ammonia outlet 12 is connected with the entrance of throttle valve 20, is equipped between high-pressure liquid ammonia outlet 12 and the entrance of throttle valve 20 Control the first shut-off valve 13 of 10 output of high pressure ammonia storage tank, the both sides of the lower part of 30 annular sidewall of low pressure recycle bucket are respectively equipped with low Hydraulic fluid ammonia entrance 31, low pressure liquefied ammonia outlet 32, the both sides on the top of 30 annular sidewall of low pressure recycle bucket are respectively equipped with ammonia return-air Entrance 33, ammonia return air outlet 34, the outlet of throttle valve 20 are connected with low pressure liquefied ammonia entrance 31, the outlet of throttle valve 20 with it is low Second shut-off valve 35 is installed, the setting of ammonia pump 40 and the lower section of low pressure recycle pump, low pressure liquefied ammonia go out between hydraulic fluid ammonia entrance 31 The outlet of mouth 32 and ammonia pump 40, the outlet of ammonia pump 40 is connected with the entrance of evaporator 50, in the outlet of ammonia pump 40 Third shut-off valve 51 is installed between the entrance of evaporator 50, the outlet of evaporator 50 is connected with ammonia return air inlet 33, ammonia Gas return air outlet 34 is connected with the entrance of refrigeration compressor 60, and the outlet of refrigeration compressor 60 is connected with the entrance of condenser 70, 4th shut-off valve 61, outlet and the height of condenser 70 are installed between the entrance of the outlet of refrigeration compressor 60 and condenser 70 Hydraulic fluid ammonia entrance 11 connects, and the bottom of low pressure recycle bucket 30 is additionally provided with oil discharge outlet 36, and jettison gear 80 includes oil removing pot 81, oil removing Tank 81 is installed on the lower section of the oil discharge outlet 36 of low pressure recycle bucket 30, and oil discharge outlet 36 is connected with the entrance at 81 top of oil removing pot, arranged Equipped with the 5th shut-off valve 811 between hydraulic fluid port 36 and oil storage tank, oil-drain pipe 812 is installed in the bottom of oil removing pot 81, in oil extraction The free end of pipeline 812 is equipped with the 6th shut-off valve 813, and back blow port 814, back blow port 814 are additionally provided in the ring wall of oil removing pot 81 It is connected by the pipeline connected between blowback pipeline 815 and ammonia pump 40 and third shut-off valve 51, is installed on blowback pipeline 815 There is the 7th shut-off valve 816；The heat that hot ammonia defrosting circuit 90 is released when being condensed with the superheated steam discharged using refrigeration compressor 60 Amount melts the frost layer on 50 surface of evaporator；Hot ammonia defrosting circuit 90 includes defrosting pipeline 91, the 8th shut-off valve 92, defrosting pipeline 91 One end connected with the pipeline between the 4th shut-off valve 61 and the entrance of condenser 70, the other end of defrosting pipeline 91 is cut with third The only pipeline connection between the entrance of valve 51 and evaporator 50, is equipped with the 8th shut-off valve 92 on defrosting pipeline 91.

Ammonia refrigeration operation principle：After liquid ammonia absorbs the heat of cooled object in evaporator 50, it is low to be vaporized into low pressure The ammonia of temperature, is sucked by refrigeration compressor 60, is discharged into condenser 70 after being compressed into the ammonia of high pressure-temperature, the quilt in condenser 70 Cooling water temperature exothermic condensation is high pressure ammoniacal liquor, and the ammoniacal liquor through the throttling of throttle valve 20 for low-temp low-pressure is again introduced into evaporator 50 Endothermic gasification achievees the purpose that circularly cooling.

Specifically, in the above-described embodiment, the density of the liquefied ammonia in low pressure recycle bucket 30 is less than the density of oil, liquefied ammonia with After oil layer, by the effect of gravity, the oil discharge outlet 36 of oil from 30 lower section of low pressure recycle bucket is flowed into oil removing pot 81, is then opened 6th shut-off valve 813 discharges oil, when oil is when low temperature viscosity is big or since sediment and oil mix blocking row When hydraulic fluid port 36, the 7th shut-off valve 816 is opened, at this moment the liquefied ammonia after ammonia pump pressurizes enters oil removing from back blow port 814 Tank 81 drives the oil of poor fluidity to be discharged from the oil-drain pipe 812 of oil removing pot 81, into the liquefied ammonia of the elevated pressures of oil removing pot 81 Reversely enter low pressure recycle bucket 30 from oil discharge outlet 36 so that blocked oil discharge outlet is dredged, while blowback such as oil removing pot 81 Liquefied ammonia density less than oil density, since the effect of buoyancy enters 30 Returning utilization of low pressure recycle bucket from oil discharge outlet 36 again, Since the oil in low pressure recycle bucket 30 is effectively removed, enter in rear class such as evaporator 50 so avoiding oil and influence system Cold performance.

In general, after the throttling of high pressure ammoniacal liquor, a kind of two-phase mixture being made of flash gas, liquefied ammonia and oily particle is generated Oily movement is penetrated, the liquid phase part in low pressure recycle bucket 30 is made to generate eddy motion, so that liquefied ammonia cannot be quickly with oily particle Layering still has a small amount of oil and is squeezed into evaporator 50 by ammonia pump 40, makes the heat exchange efficiency of evaporator 50 reduce, by setting It puts hot ammonia defrosting circuit 90 gas ammonia (60 DEG C or so) of heat is passed through inside 50 coil pipe of evaporator, can take away and be adhered to evaporator 50 Then oil on coil pipe inner wall enters oil removing pot 81 after low pressure recycle pump 30 detaches entrained oil, further improves steaming The heat transfer efficiency of device 50 is sent out, improves equipment refrigeration performance；In addition evaporator 50 can effectively be removed using hot ammonia defrosting circuit 90 The frost layer of coil pipe outer wall improves the heat transfer efficiency of evaporator 50, improves equipment refrigeration performance, and compared with natural defrosting, significantly Shorten the time of defrosting.

The jettison gear 80 of the utility model setting can effectively discharge the oil deposited in low pressure recycle bucket 30, effectively prevent The oily refrigeration performance for entering evaporator 50 and influencing Ammonia Refrigerating Equipment；Hot ammonia defrosting circuit 90 can coordinate jettison gear 80 further The oil for entering evaporator 50 on a small quantity is removed, further improves the heat transfer property of evaporator 50, and hot ammonia defrosting circuit 90 can also Effectively to 50 coil pipe outer wall defrosting of evaporator, and then the heat transfer efficiency of evaporator 50 is improved, improve equipment refrigeration performance；This Device is by jettison gear 80 and hot ammonia defrosting circuit 90 respectively from inside and outside while 50 refrigeration performance of evaporator of eliminating the effects of the act shadow Loud factor, compared with simple utilization jettison gear 80 or hot ammonia defrosting circuit 90, the refrigeration effect and refrigeration of equipment are stablized Property is more preferable.

Referring to Fig. 2, further, wave blocking plate 93 is provided in defrosting pipeline 91, wave blocking plate 93 is inserted in defrosting pipe vertically In road 91, two opposite sides and 91 inner wall of defrosting pipeline of the wave blocking plate 93 are not connected to.

When the hot ammonia frost of ammonia refrigeration system progress rushes, liquid hit phenomenon is generated in defrosting pipeline 91, leads to the pipe of defrosting pipeline 91 Cap comes off, and causes the accident；By way of swash plate 93 is set to share impact energy, to reduce rushing for the pipe cap of defrosting pipeline 91 Energy is hit, prevents the generation of accident.

Referring to Fig. 3, further, it is provided at the top of evaporator 50 for the spray to be passed through defrosting hot water in evaporator 50 Water drenching entrance 52 is equipped with discharge outlet 53 in the bottom of evaporator 50, and shower water is connected by pipeline with defrosting hot water source 54, Soft brush treatment device 55 is installed between spray water inlet 52 and defrosting hot water source 54.

In the present embodiment, using the outer wall of the liquefied ammonia pipeline serpentine coil in hot water hydro-peening evaporator 50, long-time The heat transfer of evaporator 50 can be influenced after use in its outer wall sediment incrustation, and then influences the effect of ammonia refrigeration system, passes through peace After dress soft brush treatment device 55 softens shower water, can easy, effective defrosting, while be also avoided that incrustation scale wraps up serpentine coil Outer wall influence evaporator 50 conduct heat.

Module or unit in the utility model embodiment device can be merged, divide and be deleted according to actual needs Subtract.

Above disclosed is only the utility model preferred embodiment, cannot limit the utility model with this certainly Interest field, one of ordinary skill in the art will appreciate that all or part of flow of above-described embodiment is realized, and according to this reality The equivalent variations made with novel claim still fall within the range that utility model is covered.

Claims (3)

1. a kind of freezer ammonia refrigeration system with hot ammonia defrosting circuit, it is characterised in that：Including high pressure ammonia storage tank, throttle valve, Low pressure recycle bucket, ammonia pump, evaporator, refrigeration compressor, condenser, jettison gear, hot ammonia defrosting circuit；The high pressure stores up ammonia Tank is equipped with high-pressure liquid ammonia entrance, high-pressure liquid ammonia exports；The high-pressure liquid ammonia outlet is connected with the entrance of throttle valve, in the high pressure Liquefied ammonia exports the first shut-off valve that the ammonia storage tank output of control high pressure is equipped between the entrance of throttle valve, the low pressure recycle bucket The both sides of the lower part of annular sidewall are respectively equipped with low pressure liquefied ammonia entrance, the outlet of low pressure liquefied ammonia, the low pressure recycle bucket annular sidewall The both sides on top be respectively equipped with ammonia return air inlet, ammonia return air outlet, outlet and the low pressure liquefied ammonia entrance of the throttle valve Connection, is equipped with the second shut-off valve between the outlet of the throttle valve and low pressure liquefied ammonia entrance, the ammonia pump setting with it is low Press the lower section of circulating pump, low pressure liquefied ammonia outlet and the outlet of ammonia pump, the outlet of the ammonia pump and evaporator Entrance connects, and third shut-off valve is equipped between the outlet of the ammonia pump and the entrance of evaporator, the evaporator goes out Mouth is connected with the ammonia return air inlet, and the ammonia return air outlet is connected with the entrance of the refrigeration compressor, the refrigeration The outlet of compressor is connected with the entrance of the condenser, is pacified between the outlet of the refrigeration compressor and the entrance of condenser Equipped with the 4th shut-off valve, the outlet of the condenser is connected with the high-pressure liquid ammonia entrance, and the bottom of the low pressure recycle bucket is also Equipped with oil discharge outlet, the jettison gear includes oil removing pot, and the oil removing pot is installed on the lower section of the oil discharge outlet of low pressure recycle bucket, institute It states oil discharge outlet to connect with the entrance at the top of oil removing pot, equipped with the 5th shut-off valve between the oil discharge outlet and oil storage tank, described The bottom of oil removing pot is equipped with oil-drain pipe, the 6th shut-off valve is equipped in the free end of the oil-drain pipe, in the oil removing The ring wall of tank is additionally provided with back blow port, and the back blow port passes through the pipeline that is connected between blowback pipeline and ammonia pump and third shut-off valve Connection, the 7th shut-off valve is equipped on the blowback pipeline；What the hot ammonia defrosting circuit was discharged with utilizing refrigeration compressor The heat that superheated steam is released when condensing melts the frost layer of evaporator surface；The hot ammonia defrosting circuit includes defrosting pipeline, the Eight shut-off valves, the pipeline between one end of the defrosting pipeline and the 4th shut-off valve and the entrance of condenser connects, described Pipeline between the other end of defrosting pipeline and the third shut-off valve and the entrance of evaporator connects, on the defrosting pipeline 8th shut-off valve is installed.

2. there is the freezer ammonia refrigeration system in hot ammonia defrosting circuit as described in claim 1, it is characterised in that：In the punching Wave blocking plate is provided in white pipeline, the wave blocking plate is inserted vertically in defrosting pipeline, two opposite sides of the wave blocking plate Side is not connected to defrosting inner wall of the pipe.

3. there is the freezer ammonia refrigeration system in hot ammonia defrosting circuit as described in claim 1, it is characterised in that：In the evaporation It is provided at the top of device for the spray water inlet to be passed through defrosting hot water in evaporator, row is equipped in the bottom of the evaporator The mouth of a river, the shower water are connected by pipeline with defrosting hot water source, between the spray water inlet and defrosting hot water source Soft brush treatment device is installed.