CN115451642A

CN115451642A - Evaporator defrosting device for food storage refrigeration house

Info

Publication number: CN115451642A
Application number: CN202211115124.5A
Authority: CN
Inventors: 尹岩峰
Original assignee: Kunming Tiance Energy Saving Technology Co ltd
Current assignee: Kunming Tiance Energy Saving Technology Co ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2022-12-09
Anticipated expiration: 2042-09-14
Also published as: CN115451642B

Abstract

The invention discloses an evaporator defrosting device for a food storage refrigeration house, which comprises a holding rod, wherein a bottom end sleeve is arranged at the top end of the holding rod, a top end sleeve is hinged to the top end of the bottom end sleeve, a rotating shaft is sleeved in the holding rod, a first movable plate is arranged in the bottom end sleeve, a first defrosting sleeve is arranged at the front end of the bottom end sleeve, the bottom end of the first movable plate is connected with a rotating wheel, a second movable plate is arranged in the top end sleeve, and a second defrosting sleeve is arranged outside the top end sleeve. According to the invention, after the bottom end sleeve and the top end sleeve are wrapped on the outer side of the exhaust pipe of the evaporator, the power supply of the rotating motor is switched on, so that the rotating shaft can drive the rotating wheel to rotate, the first movable plate is driven by the connecting rod to continuously and reciprocally swing in the bottom end sleeve, and the second movable plate is driven to swing together under the support of the first movable plate, so that the first defrosting sleeve and the second defrosting sleeve reciprocally move on the outer side of the exhaust pipe of the evaporator, the defrosting purpose is achieved, and the phenomenon that the evaporator pipe is deformed due to knocking is avoided.

Description

Evaporator defrosting device for food storage refrigeration house

Technical Field

The invention belongs to the technical field of defrosting of a refrigeration house, and particularly relates to an evaporator defrosting device for a food storage refrigeration house.

Background

The principle of the evaporator is that low-temperature and low-pressure liquid refrigerant is gasified and absorbs heat at one side of the heat transfer wall of the evaporator, so that the medium at the other side of the heat transfer wall is cooled, and the evaporator exchanges heat in the refrigerator through the evaporator calandria, thereby achieving the purpose of cooling the refrigerator and preserving food.

Patent CN201520008135.2 discloses an evaporation calandria group for refrigerating system, this patent installs the feed liquor pipe in one side of liquid header, and the feed liquor hole has been seted up to the opposite side, is provided with the orifice plate that flow equalizes in the liquid header, can effectively accomplish the effect of flow equalizing of refrigerant in the evaporator calandria group, makes each position of evaporator supply liquid balanced, has improved whole heat transfer effect, has improved whole efficiency and operational reliability.

Patent CN202021656322.9 discloses a freezer that is equipped with aluminium calandria, this freezer that is equipped with aluminium calandria solves the long-pending frost phenomenon of freezer evaporimeter and extensively exists, and the frost layer can seriously influence evaporimeter surface heat exchange efficiency, has increased the problem of the holistic consumption of freezer.

Because the freezer is in the low temperature state for a long time, make the evaporimeter calandria in long-term the use, the frosting phenomenon can take place for the surface of evaporimeter calandria, when the defrosting, the staff can strike the surface of evaporimeter calandria in the freezer in order to defrost, because the evaporimeter calandria is mostly the hollow tubular structure of aluminium matter, lead to the staff to strike the evaporimeter calandria when striking easily and warp, lead to the liquid flow in the evaporimeter calandria to receive the influence, and then can exert an influence to the heat exchange of evaporimeter.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The present invention is directed to an evaporator defroster for a food storage freezer that solves the above problems of the prior art.

In order to achieve the purpose, the invention provides an evaporator defrosting device for a food storage refrigerator, which comprises a holding rod, wherein a bottom end sleeve is arranged at the top end of the holding rod, a top end sleeve is hinged at the top end of the bottom end sleeve, the bottom end sleeve and the top end sleeve can be wrapped outside a pipe of the refrigerator evaporator after being folded, a rotating shaft is sleeved in the holding rod, the bottom end of the rotating shaft is coaxially connected with a rotating motor, the top end of the rotating shaft is coaxially connected with a first bevel gear, a first movable plate is connected in the bottom end sleeve in a sliding manner, a first defrosting sleeve in a hollow semi-circular truncated cone structure is installed at the front end of the bottom end sleeve, a rotating wheel is hinged at the bottom end of the first movable plate through a connecting rod, the axis of the tail end of the connecting rod and the axis of the rotating wheel are in an eccentric manner, a second bevel gear is coaxially connected on the rotating wheel and meshed with the first bevel gear, the main shape of the top end sleeve is the same as that of the bottom end sleeve, a second movable plate is slidably connected in the top end sleeve, and a second defrosting sleeve is arranged outside the top end sleeve.

In the technical scheme of the invention, the top end of the holding rod is provided with a top seat, the side wall of the top seat is provided with a sleeve groove, the first bevel gear is positioned in the sleeve groove, the bottom end of the top seat is provided with a base, the bottom end of the base is provided with a bottom cover, and the rotating motor is arranged in the base.

In the technical scheme of the invention, the bottom end sleeve and the top end sleeve are of semi-cylindrical structures, the top end of the bottom end sleeve is provided with a sleeve cavity, the cavity wall of the sleeve cavity is provided with a plurality of mounting grooves, the mounting grooves are rotationally connected with a plurality of rollers, and when the bottom end sleeve is sleeved outside a rack pipe of a refrigeration house evaporator, the rollers are abutted against the surface of the rack pipe.

In the technical scheme of the invention, a movable cavity in a semi-annular structure is formed in the bottom end sleeve, a movable groove communicated with the movable cavity is formed in the front side surface of the bottom end sleeve, the first movable plate is sleeved in the movable cavity, and an inserting plate is arranged at the front end of the first movable plate and extends out of the movable groove.

In the technical scheme of the invention, a first lug is arranged at the right side edge of the top end of the bottom end sleeve, a pair of hinge stations is arranged at the left side edge of the top end of the bottom end sleeve, a hinge plate is arranged at the left side edge of the top end sleeve, the hinge plate extends between the two hinge stations and is hinged with the hinge stations, a second lug is arranged at the right side edge of the bottom end of the top end sleeve, the second lug can be attached to the first lug, a butterfly bolt is arranged at the bottom end of the first lug, and the tail end of the butterfly bolt can be in threaded connection with the second lug.

In the technical scheme of the invention, a convex base is arranged at the bottom end of the bottom end sleeve, a cavity is formed in the bottom end sleeve, the rotating wheel is installed in the cavity and is in rotating connection with the convex base, the second bevel gear is positioned on the outer side of the convex base, and the top base is fixed on the end face of the rear side of the convex base.

In the technical scheme of the invention, the head end and the tail end of the first movable plate are both provided with abutting columns, the cross section size of each abutting column is smaller than that of the first movable plate, the bottom end of the first movable plate is provided with a connecting seat, and the head end of the connecting rod is hinged with the connecting seat.

In the technical scheme of the invention, a slot is formed in the rear end face of the first defrosting sleeve, a plurality of shovel plates are arranged on the peripheral surface of the first defrosting sleeve, the shape of the second defrosting sleeve is the same as that of the first defrosting sleeve, and the second defrosting sleeve is provided with the structure which is the same as that of the slot and the shovel plates.

In the technical scheme of the invention, the top end sleeve is provided with a structure with the same shape as the sleeve cavity, the mounting groove, the roller, the movable cavity and the movable groove, the main body shape of the second movable plate is the same as that of the first movable plate, and the second movable plate is provided with a structure with the same shape as that of the support column and the inserting plate.

In the technical scheme of the invention, the air conditioner is provided with a fan,

in summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. according to the invention, the bottom end sleeve arranged at the top end of the holding rod is hinged with the top end sleeve, so that after the bottom end sleeve and the top end sleeve are wrapped outside a calandria of the evaporator, a power supply of the rotating motor is switched on to enable the rotating motor to drive the rotating wheel to rotate through the rotating shaft, the rotating wheel drives the first movable plate to continuously and reciprocally swing in the bottom end sleeve under the action of the connecting rod, the second movable plate is enabled to simultaneously swing under the propping action of the first movable plate, and therefore the first defrosting sleeve and the second defrosting sleeve can conveniently reciprocate outside the calandria of the evaporator.

2. According to the invention, the shovel plates arranged on the outer side surfaces of the bottom end sleeve and the top end sleeve are folded and sleeved on the outer side of the evaporator calandria and driven by the first movable plate to reciprocate, so that the shovel plates can scrape off frost on the surface of the evaporator calandria, and the defrosting effect is improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the present invention;

FIG. 3 is an exploded view of the overall structure of the present invention;

FIG. 4 is an exploded view of a grip lever of the present invention;

FIG. 5 is an exploded view of the bottom end cap of the present invention;

FIG. 6 is a partial sectional view of the bottom end cap of the present invention;

FIG. 7 is a schematic view of the connection between the first movable plate and the rotating wheel according to the present invention;

FIG. 8 is a structural view of a first defrost jacket of the present invention;

FIG. 9 is a structural view of the rotor of the present invention;

FIG. 10 is an exploded view of the top end cap of the present invention;

fig. 11 is a structural view of a second defrost jacket in accordance with the present invention.

Description of reference numerals:

1-a holding rod; 11-a top seat; 111-jacket groove; 12-a base; 121-a bottom cover; 13-a rotating shaft; 131-a rotating motor; 132-a first bevel gear;

2-bottom end sleeve; 21-a sleeve cavity; 211-a mounting groove; 212-a roller; 22-a movable cavity; 221-a movable groove; 23-a first lug; 24-a butterfly bolt; 25-boss; 251-a cavity; 26-a hinging table; 27-a first flap; 271-support columns; 272-insert plate; 273-a connecting seat; 28-a first defrost jacket; 281-slot; 282-blade; 29-a wheel; 291-a connecting rod; 292-a second bevel gear;

3-top end sleeve; 31-a hinge plate; 32-a second lug; 33-a second flap; 34-second defrost jacket.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

Referring to fig. 1-11, the evaporator defrosting device for the food storage refrigerator of the invention comprises a holding rod 1, wherein a bottom end sleeve 2 is arranged at the top end of the holding rod 1, a top end sleeve 3 is hinged at the top end of the bottom end sleeve 2, and the bottom end sleeve 2 and the top end sleeve 3 can be wrapped outside a discharge pipe of the refrigerator evaporator after being folded.

In the invention, a rotating shaft 13 is sleeved in a holding rod 1, the bottom end of the rotating shaft 13 is coaxially connected with a rotating motor 131, the top end of the rotating shaft 13 is coaxially connected with a first bevel gear 132, the top end of the holding rod 1 is provided with a top seat 11, the side wall of the top seat 11 is provided with a sleeve groove 111, the first bevel gear 132 is positioned in the sleeve groove 111, the bottom end of the top seat 11 is provided with a base 12, the bottom end of the base 12 is provided with a bottom cover 121, the rotating motor 131 is arranged in the base 12, when the rotating motor 131 is communicated with an external power supply, the rotating motor 131 starts to work and drives the rotating shaft 13 to rotate, so that the rotating shaft 13 drives the first bevel gear 132 to rotate in the sleeve groove 111.

Specifically, the outward appearance of bottom cover 2 and top cover 3 all is the halfcylinder structure, the main part shape of top cover 3 is the same with the main part shape of bottom cover 2, cover cavity 21 has been seted up on the top of bottom cover 2, a plurality of mounting grooves 211 have been seted up on the chamber wall of cover cavity 21, the internal rotation of mounting groove 211 is connected with a plurality of gyro wheels 212, when establishing bottom cover 2 cover in the calandria outside of freezer evaporimeter, gyro wheel 212 offsets with the surface of calandria, make bottom cover 2 fold in the outside of evaporimeter calandria with top cover 3 after, hold and stir holding pole 1 and can make bottom cover 2 and top cover 3 can remove along the surface of evaporimeter calandria smoothly under the effect of gyro wheel 212 along with the staff.

Furthermore, a first lug 23 is arranged at the right side edge of the top end of the bottom end sleeve 2, a pair of hinge platforms 26 is arranged at the left side edge of the top end of the bottom end sleeve 2, a hinge plate 31 is arranged at the left side edge of the top end sleeve 3, and the hinge plate 31 extends between the two hinge platforms 26 and is hinged to the hinge platforms 26, so that the bottom end sleeve 2 is hinged to the top end sleeve 3. The right edge of the bottom end of the top end sleeve 3 is provided with a second lug 32, the second lug 32 can be attached to the first lug 23, the bottom end of the first lug 23 is provided with a butterfly bolt 24, the tail end of the butterfly bolt 24 can be in threaded connection with the second lug 32, the first lug 23 and the second lug 32 can be fixed together by closing the bottom end sleeve 2 and the top end sleeve 3 on the outer side of the evaporator pipe bank and then screwing the butterfly bolt 24, so that the bottom end sleeve 2 and the top end sleeve 3 are combined together and sleeved on the outer side of the evaporator pipe bank, and the bottom end sleeve 2 and the top end sleeve 3 are prevented from falling off from the evaporator pipe bank.

In addition, the bottom end cover 2 is slidably connected with a first movable plate 27, the first movable plate 27 is of an arc-shaped plate structure, a movable cavity 22 of a semi-annular structure is formed in the bottom end cover 2, the first movable plate 27 is sleeved in the movable cavity 22 and can slide along the movable cavity 22, a movable groove 221 communicated with the movable cavity 22 is formed in the front side surface of the bottom end cover 2, an insertion plate 272 of the arc-shaped plate structure is arranged at the front end of the first movable plate 27, the insertion plate 272 extends out of the movable groove 221, and the length of the insertion plate 272 is smaller than that of the movable groove 221, so that the first movable plate 27 can drive the insertion plate 272 to move in the movable groove 221 when moving in the movable cavity 22.

It should be noted that the bottom end of the first movable plate 27 is hinged to the rotating wheel 29 through the connecting rod 291, the bottom end of the first movable plate 27 is provided with the connecting seat 273, the head end of the connecting rod 291 is hinged to the connecting seat 273, the end axis of the connecting rod 291 is eccentric to the axis of the rotating wheel 29, the bottom end of the bottom end sleeve 2 is provided with the convex seat 25, the bottom end sleeve 2 is internally provided with the cavity 251, the rotating wheel 29 is installed in the cavity 251 and rotatably connected to the convex seat 25, the rotating wheel 29 is coaxially connected to the second bevel gear 292, the second bevel gear 292 is meshed with the first bevel gear 132, the second bevel gear 292 is located outside the convex seat 25, when the rotating shaft 13 drives the first bevel gear 132 to rotate, the first bevel gear 132 drives the rotating wheel 29 to rotate through the second bevel gear 292, so that the rotating wheel 29 drives the end of the connecting rod 291 to rotate continuously, because the end of the connecting rod 291 is eccentric to the center of the rotating wheel 29, the rotating wheel 29 drives the first movable plate 27 to reciprocate along the movable cavity 22 through the connecting rod 291, so that the first movable plate 27 keeps moving state in the bottom end sleeve 2. The top seat 11 is fixed on the rear end face of the boss 25, so that the grip lever 1 and the bottom end cover 2 are fixed together.

In the above scheme, the top end sleeve 3 is slidably connected with the second movable plate 33, the top end sleeve 3 is provided with a structure having the same shape as the sleeve cavity 21, the mounting groove 211, the roller 212, the movable cavity 22 and the movable groove 221, the main body shape of the second movable plate 33 is the same as that of the first movable plate 27, the second movable plate 33 is provided with a structure having the same shape as that of the abutment 271 and the insertion plate 272, so that the second movable plate 33 can move in the top end sleeve 3, and after the top end sleeve 3 and the bottom end sleeve 2 are folded, two ends of the second movable plate 33 can abut against two ends of the first movable plate 27, so that the first movable plate 27 can drive the second movable plate 33 to reciprocate together in the top end sleeve 3 when reciprocating in the bottom end sleeve 2. The first movable plate 27 and the second movable plate 27 are respectively provided with a support pillar 271 at the first end and the last end, the cross sectional dimension of the support pillar 271 is smaller than that of the first movable plate 27, so that when the first movable plate 27 drives the second movable plate 33 to move together, a gap is formed between the connecting part of the ends of the first movable plate 27 and the second movable plate 33 and the inner wall of the end part of the movable cavity 22, and the situation that the first movable plate 27 cannot move continuously due to resistance caused by touching the connecting part between the top end sleeve 3 and the bottom end sleeve 2 when the first movable plate 27 moves into the top end sleeve 3 can be prevented, and the first movable plate 27 and the second movable plate 33 can smoothly move in the bottom end sleeve 2 and the top end sleeve 3 respectively

Specifically, the first defrosting sleeve 28 that is hollow half round platform column structure is installed to the front end of bottom end cover 2, slot 281 has been seted up on the rear end face of first defrosting sleeve 28, picture peg 272 inserts and fixes to slot 281 in, make first defrosting sleeve 28 and first movable plate 27 fixed connection, be equipped with a plurality of shovel boards 282 on the peripheral surface of first defrosting sleeve 28, when first movable plate 27 carries out reciprocating motion in bottom end cover 2, first movable plate 27 can drive first defrosting sleeve 28 with the motion, make the shovel board 282 of first defrosting sleeve 28 surface can constantly carry out the shovel to the frost on the evaporimeter calandria, reach the purpose of defrosting. The second defrosting sleeve 34 is arranged on the outer side of the top end sleeve 3, the shape of the second defrosting sleeve 34 is the same as that of the first defrosting sleeve 28, and the second defrosting sleeve 34 is provided with a structure which is the same as that of the slot 281 and the shovel plate 282, so that after the top end sleeve 3 and the bottom end sleeve 2 are folded, the second defrosting sleeve 34 can be folded with the first defrosting sleeve 28, and frost on the outer side of the evaporator pipe bank can be shoveled together with the second defrosting sleeve 34 when the first movable plate 27 drives the second movable plate 33 to move, workers do not need to knock the evaporator pipe bank to knock the evaporator pipe to remove the frost on the surface of the evaporator pipe bank, the purpose of protecting the evaporator pipe bank is achieved, and the evaporator pipe bank is prevented from being knocked to deform.

The working principle of the evaporator defrosting device for the food storage refrigeration house is as follows:

firstly, after the top end sleeve 3 is opened on the bottom end sleeve 2 and the bottom end sleeve 2 is attached to the bottom of the evaporator calandria, the top end sleeve 3 is folded on the bottom end sleeve 2 and the butterfly bolt 24 is screwed so that the first lug 23 and the second lug 32 are fixed together, thereby the bottom end sleeve 2 and the top end sleeve 3 are combined together and sleeved on the outer side of the evaporator calandria to prevent the bottom end sleeve 2 and the top end sleeve 3 from falling off from the evaporator calandria, then a worker connects the rotating motor 131 with an external power supply to make the rotating motor 131 start to work and drive the rotating shaft 13 to rotate, so that the rotating shaft 13 drives the first bevel gear 132 to rotate in the sleeve groove 111, and finally, along with the rotation of the first bevel gear 132, the first bevel gear 132 drives the rotating wheel 29 to rotate through the second bevel gear 292 so that the rotating wheel 29 drives the tail end of the connecting rod 291 to rotate continuously, because the end of the connecting rod 291 is eccentric with the center of the rotating wheel 29, the rotating wheel 29 can drive the first movable plate 27 to reciprocate along the movable cavity 22 through the connecting rod 291 when rotating, and because the top end sleeve 3 and the bottom end sleeve 2 are in a closed state, the first movable plate 27 can drive the second movable plate 33 to reciprocate in the top end sleeve 3 when reciprocating, so that the first defrosting sleeve 28 and the second defrosting sleeve 34 positioned outside the bottom end sleeve 2 and the top end sleeve 3 can synchronously reciprocate, and at this time, a worker can continuously shovel frost on the surface of the evaporator calandria through an integral structure combining the first defrosting sleeve 28 and the second defrosting sleeve 34 when holding the holding rod 1 and transferring the holding rod 1 along the evaporator calandria, without knocking the evaporator calandria, thereby preventing the evaporator calandria from being damaged.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. The utility model provides an evaporimeter defroster for food storage freezer, includes holding pole (1), its characterized in that: the defrosting device is characterized in that a bottom end sleeve (2) is arranged at the top end of the holding rod (1), a top end sleeve (3) is hinged to the top end of the bottom end sleeve (2), the bottom end sleeve (2) and the top end sleeve (3) can be wrapped on the outer side of a pipe of a refrigeration house evaporator after being folded, a rotating shaft (13) is arranged in the holding rod (1) in a sleeved mode, the bottom end of the rotating shaft (13) is coaxially connected with a rotating motor (131), the top end of the rotating shaft (13) is coaxially connected with a first bevel gear (132), a first movable plate (27) is connected in the bottom end sleeve (2) in a sliding mode, a first defrosting sleeve (28) which is of a hollow semi-circular truncated cone structure is installed at the front end of the bottom end sleeve (2), a rotating wheel (29) is hinged to the bottom end of the first movable plate (27) through a connecting rod (291), the axis of the tail end of the connecting rod (291) and the axis of the rotating wheel (29) are in an eccentric mode, a second defrosting gear (292) is coaxially connected to the rotating wheel (29), the second bevel gear (292) is meshed with the first bevel gear (132), the top end sleeve (3), and the shape of the second defrosting sleeve (3) is the second movable plate (33).

2. The evaporator defroster for a food storage freezer of claim 1 further characterized by: the top end of the holding rod (1) is provided with a top seat (11), a sleeve groove (111) is formed in the side wall of the top seat (11), the first bevel gear (132) is located in the sleeve groove (111), the bottom end of the top seat (11) is provided with a base (12), a bottom cover (121) is installed at the bottom end of the base (12), and the rotating motor (131) is installed in the base (12).

3. The evaporator defroster for a food storage freezer of claim 1 further characterized by: bottom end cover (2) with the outward appearance of top cover (3) all is the half cylinder structure, cover chamber (21) have been seted up on the top of bottom end cover (2), a plurality of mounting grooves (211) have been seted up on the chamber wall of cover chamber (21), mounting groove (211) internal rotation is connected with a plurality of gyro wheels (212), and will when bottom end cover (2) cover is established in the calandria outside of freezer evaporimeter, gyro wheel (212) offset with the surface of calandria.

4. The evaporator defroster for a food storage freezer of claim 1 further characterized by: seted up activity chamber (22) that are the semiannular structure in end cover (2), seted up on the front side surface of end cover (2) with activity groove (221) that activity chamber (22) are linked together, first fly leaf (27) cover is established in activity chamber (22), the front end of first fly leaf (27) is equipped with picture peg (272), picture peg (272) are followed stretch out in activity groove (221).

5. The evaporator defroster for a food storage freezer of claim 1 further characterized by: the improved structure of the hinge comprises a bottom end sleeve (2), and is characterized in that a first lug (23) is arranged at the right side edge of the top end of the bottom end sleeve (2), a pair of hinge platforms (26) is arranged at the left side edge of the top end of the bottom end sleeve (2), a hinge plate (31) is arranged at the left side edge of the top end sleeve (3), the hinge plate (31) extends into the space between the two hinge platforms (26) and is hinged to the hinge platforms (26), a second lug (32) is arranged at the right side edge of the bottom end of the top end sleeve (3), the second lug (32) can be attached to the first lug (23), a butterfly bolt (24) is arranged at the bottom end of the first lug (23), and the tail end of the butterfly bolt (24) can be in threaded connection with the second lug (32).

6. The evaporator defroster for a food storage freezer of claim 1 further characterized by: the bottom end of the bottom end sleeve (2) is provided with a convex base (25), a cavity (251) is formed in the bottom end sleeve (2), the rotating wheel (29) is installed in the cavity (251) and is rotationally connected with the convex base (25), the second bevel gear (292) is located on the outer side of the convex base (25), and the top base (11) is fixed on the rear end face of the convex base (25).

7. The evaporator defroster for a food storage freezer of claim 1 further characterized by: the head and tail ends of the first movable plate (27) are provided with abutting columns (271), the cross section size of the abutting columns (271) is smaller than that of the first movable plate (27), the bottom end of the first movable plate (27) is provided with a connecting seat (273), and the head end of the connecting rod (291) is hinged to the connecting seat (273).

8. The evaporator defroster for a food storage freezer of claim 1 further characterized by: the rear end face of the first defrosting sleeve (28) is provided with a slot (281), the peripheral surface of the first defrosting sleeve (28) is provided with a plurality of shoveling plates (282), the shape of the second defrosting sleeve (34) is the same as that of the first defrosting sleeve (28), and the second defrosting sleeve (34) is provided with the structure which is the same as that of the slot (281) and the shoveling plates (282).

9. The evaporator defroster for a food storage freezer of claim 1 further characterized by: the top end cover (3) is provided with a structure which is the same as the cover cavity (21), the mounting groove (211), the roller (212), the movable cavity (22) and the movable groove (221) in shape, the main body shape of the second movable plate (33) is the same as that of the first movable plate (27), and the second movable plate (33) is provided with a structure which is the same as that of the support column (271) and the inserting plate (272).