CN115451642B

CN115451642B - Evaporator defrosting device for food storage refrigeration house

Info

Publication number: CN115451642B
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: 2023-04-28
Anticipated expiration: 2042-09-14
Also published as: CN115451642A

Abstract

The invention discloses an evaporator defrosting device for a food storage refrigeration house, which comprises a holding rod, wherein the top end of the holding rod is provided with a bottom end sleeve, the top end of the bottom end sleeve is hinged with a top end sleeve, a rotating shaft is sleeved in the holding rod, a first movable plate is arranged in the bottom end sleeve, the front end of the bottom end sleeve is provided with a first defrosting 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 evaporator calandria, the rotating shaft can drive the rotating wheel to rotate by switching on the power supply of the rotating motor, and the connecting rod drives the first movable plate to continuously and reciprocally swing in the bottom end sleeve, so that the second movable plate swings together under the abutting of the first movable plate, and the first defrosting sleeve and the second defrosting sleeve reciprocate on the outer side of the evaporator calandria, thereby achieving the aim of defrosting and avoiding the deformation of the evaporator tube caused by knocking.

Description

Evaporator defrosting device for food storage refrigeration house

Technical Field

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

Background

The evaporator of the refrigeration house is an evaporator used by refrigeration equipment such as refrigeration houses, and the like, and is a partition wall type heat exchange device, and the principle is that low-temperature low-pressure liquid refrigerant is gasified and absorbed on one side of a heat transfer wall of the evaporator, so that a medium on the other side of the heat transfer wall is cooled, and the evaporator exchanges heat in the refrigeration house through an evaporator calandria, thereby achieving the purpose of cooling the refrigeration house and preserving food.

Patent CN201520008135.2 discloses an evaporation calandria group for refrigerating system, the liquid inlet pipe is installed on one side of the liquid header, the liquid inlet hole is provided on the other side, the flow equalizing pore plate is provided in the liquid header, the flow equalizing effect of the refrigerant in the evaporator calandria group can be effectively completed, the liquid supply at each part of the evaporator is balanced, the overall heat exchanging effect is improved, and the overall energy efficiency and the operation reliability are improved.

Patent CN202021656322.9 discloses a freezer that is equipped with aluminium calandria, and this freezer that is equipped with aluminium calandria solves the freezer evaporator and amasses the phenomenon widely existing, and the frost layer can seriously influence the surface heat exchange efficiency of evaporator, has increased the holistic problem of consumption of freezer.

Because be in low temperature state for a long time in the freezer for the evaporator calandria can take place frosting phenomenon in long-term use on the surface of evaporator calandria, when defrosting, the staff can strike the surface of evaporator calandria in the freezer in order to defrost, because the evaporator calandria is mostly hollow tubular structure of aluminium matter, leads to the staff to strike the evaporator calandria when beating and warp easily, leads to the liquid flow in the evaporator calandria to receive the influence, and then can influence 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 of ordinary skill in the art.

Disclosure of Invention

The present invention is directed to an evaporator defrosting apparatus for a food storage freezer, which solves the above-mentioned problems of the prior art.

In order to achieve the above object, the invention provides an evaporator defrosting device for a food storage refrigeration house, comprising a holding rod, wherein the top end of the holding rod is provided with a bottom end sleeve, the top end of the bottom end sleeve is hinged with a top end sleeve, the bottom end sleeve and the top end sleeve are sleeved together and can be wrapped outside a calandria of the refrigeration house evaporator, 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 slidably connected in the bottom end sleeve, the front end of the bottom end sleeve is provided with a first defrosting sleeve in a hollow half-round table structure, the bottom end of the first movable plate is hinged with a rotating wheel through a connecting rod, the tail end axle center of the connecting rod and the axle center of the rotating wheel are in an eccentric shape, a second bevel gear is coaxially connected to the rotating wheel, the second bevel gear is meshed with the first bevel gear, the main body shape of the top end sleeve is identical to the main body shape of the bottom end sleeve, a second movable plate is slidably connected in the top end sleeve, and the outer side of the second defrosting sleeve is arranged.

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 appearances of the bottom end sleeve and the top end sleeve are in semi-cylindrical structures, a sleeve cavity is formed in the top end of the bottom end sleeve, a plurality of mounting grooves are formed in the cavity wall of the sleeve cavity, a plurality of rollers are connected in a rotating mode in the mounting grooves, and when the bottom end sleeve is sleeved outside a calandria of a refrigeration house evaporator, the rollers are propped against the surface of the calandria.

In the technical scheme of the invention, a movable cavity with 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, the front end of the first movable plate is provided with a plugboard, and the plugboard 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 plates are 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 stretches into between the two hinge plates and is hinged with the hinge plates, 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, the bottom end of the bottom end sleeve is provided with the convex seat, the bottom end sleeve is internally provided with the cavity, the rotating wheel is arranged in the cavity and is rotationally connected with the convex seat, the second bevel gear is positioned at the outer side of the convex seat, and the top seat is fixed on the end face of the rear side of the convex seat.

In the technical scheme of the invention, the head end and the tail end of the first movable plate are respectively provided with a propping column, the cross section size of the propping 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, the rear end face of the first defrosting sleeve is provided with the slot, the peripheral surface of the first defrosting sleeve is provided with the plurality of shovel plates, 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 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 which is the same 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 the main body shape of the first movable plate, and the second movable plate is provided with a structure which is the same as the support column and the plugboard.

In the technical proposal of the invention, the device comprises a plurality of control units,

in summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:

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 the evaporator calandria, the rotating motor can be powered on 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, and the second movable plate swings together under the abutting of the first movable plate, so that the first defrosting sleeve and the second defrosting sleeve conveniently reciprocate outside the evaporator calandria, and at the moment, a worker can make the bottom end sleeve and the top end sleeve in motion carry out shoveling off frost tied on the outer wall of the evaporator calandria through holding the holding rod and making the holding rod move along the axial direction of the evaporator calandria, thereby avoiding the occurrence of deformation of the evaporator calandria caused by knocking.

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 used for enabling the bottom end sleeve and the top end sleeve to be folded and sleeved on the outer side of the evaporator calandria and driven by the first movable plate to reciprocate, so that frost on the surface of the evaporator calandria can be scraped by the shovel plates, 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 representation of the use 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 the grip lever of the present invention;

FIG. 5 is an exploded view of the midsole of the present invention;

FIG. 6 is a cross-sectional view of a portion of the construction of the midsole of the present invention;

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

FIG. 8 is a block diagram of a first defrost case in accordance with the present invention;

FIG. 9 is a block diagram of a wheel according to the present invention;

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

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

Reference numerals illustrate:

1-a grip lever; 11-footstock; 111-sleeve grooves; 12-a base; 121-a bottom cover; 13-a rotating shaft; 131-rotating the motor; 132-first bevel gear;

2-bottom end sleeve; 21-a sleeve cavity; 211-mounting slots; 212-a roller; 22-active cavity; 221-a movable groove; 23-a first lug; 24-butterfly bolts; 25-convex seats; 251-cavity; 26-hinging stage; 27-a first movable plate; 271-prop; 272-plugboard; 273-connecting base; 28-a first defrost case; 281-slot; 282-spade plate; 29-a rotating wheel; 291-connecting rod; 292-a second bevel gear;

3-top end sleeve; 31-hinging plates; 32-a second lug; 33-a second movable plate; 34-a second defrost case.

Detailed Description

The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.

Referring to fig. 1 to 11, the defrosting device for the evaporator of the food storage refrigeration house comprises a holding rod 1, wherein the top end of the holding rod 1 is provided with a bottom end sleeve 2, the top end of the bottom end sleeve 2 is hinged with a top end sleeve 3, and the bottom end sleeve 2 and the top end sleeve 3 can be wrapped outside a calandria of the refrigeration house evaporator after being folded.

In the invention, a rotating shaft 13 is sleeved in a holding rod 1, a rotating motor 131 is coaxially connected to the bottom end of the rotating shaft 13, a first bevel gear 132 is coaxially connected to the top end of the rotating shaft 13, a top seat 11 is arranged at the top end of the holding rod 1, a sleeve groove 111 is formed in the side wall of the top seat 11, the first bevel gear 132 is positioned in the sleeve groove 111, a base 12 is arranged at the bottom end of the top seat 11, a bottom cover 121 is arranged at the bottom end of the base 12, the rotating motor 131 is arranged in the base 12, and when the rotating motor 131 is connected 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 semi-cylindrical structure, the main part shape of top cover 3 is the same with the main part shape of bottom cover 2, cover chamber 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 chamber 21, the mounting groove 211 internal rotation is connected with a plurality of gyro wheels 212, when establishing bottom cover 2 cover in the calandria outside of freezer evaporator, gyro wheel 212 offsets with the surface of calandria, make bottom cover 2 and top cover 3 fold in the outside of evaporator calandria after, grip lever 1 can be made along with the staff grips and stir to grip lever 2 and top cover 3 can follow the surface of evaporator calandria smoothly under the effect of gyro wheel 212 and remove.

Further, the right edge of the top end of the bottom end sleeve 2 is provided with a first lug 23, the left edge of the top end of the bottom end sleeve 2 is provided with a pair of hinge plates 26, the left edge of the top end sleeve 3 is provided with a hinge plate 31, and the hinge plate 31 extends between the two hinge plates 26 and is hinged with the hinge plates 26, so that the bottom end sleeve 2 is hinged with the top end sleeve 3. The right side 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 connected with the second lug 32 in a threaded manner, the first lug 23 and the second lug 32 can be fixed together by screwing the butterfly bolt 24 after the bottom end sleeve 2 and the top end sleeve 3 are folded on the outer side of the evaporator calandria, and therefore the bottom end sleeve 2 and the top end sleeve 3 are combined together and sleeved on the outer side of the evaporator calandria, and the bottom end sleeve 2 and the top end sleeve 3 are prevented from falling off from the evaporator calandria.

In addition, sliding connection has first fly leaf 27 in bottom cover 2, first fly leaf 27 is arc platy structure, set up the activity chamber 22 that is semi-annular structure in the bottom cover 2, first fly leaf 27 cover is established in activity chamber 22 and can follow activity chamber 22 and slide, set up the movable groove 221 that is linked together with activity chamber 22 on the front side surface of bottom cover 2, the front end of first fly leaf 27 is equipped with the picture peg 272 that is arc platy structure, picture peg 272 stretches out from movable groove 221, the length of picture peg 272 is less than the length of movable groove 221 for first fly leaf 27 can drive picture peg 272 and move in movable groove 221 when activity chamber 22 is interior.

It is noted that the bottom of the first movable plate 27 is hinged with the rotating wheel 29 through the connecting rod 291, the bottom of the first movable plate 27 is provided with the connecting seat 273, the head end of the connecting rod 291 is hinged with the connecting seat 273, the tail end axle center of the connecting rod 291 is eccentric with the axle center 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 is rotationally connected with the convex seat 25, the rotating wheel 29 is coaxially connected with 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 on the outer side of 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 tail end of the connecting rod 291 is continuously rotated, and the tail end of the connecting rod 291 is eccentric with the center of the rotating wheel 29, so that the rotating wheel 29 drives the first movable plate 27 to reciprocate along the movable cavity 22 through the connecting rod 291 when rotating, and the first movable plate 27 keeps a moving state in the bottom end sleeve 2. The top seat 11 is fixed on the rear end surface of the boss 25, so that the holding rod 1 and the bottom end sleeve 2 are fixed together.

In the above-mentioned scheme, the second movable plate 33 is slidably connected in the top end sleeve 3, the top end sleeve 3 is provided with a structure identical to 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 identical to the main body shape of the first movable plate 27, the second movable plate 33 is provided with a structure identical to the shape of the supporting column 271 and the inserting 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 in the top end sleeve 3 together when reciprocating in the bottom end sleeve 2. The first movable plate 27 is provided with the supporting posts 271 at the head and tail ends, the cross section of the supporting posts 271 is smaller than that of the first movable plate 27, when the first movable plate 27 drives the second movable plate 33 to move together, a gap is reserved between the end connection part 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, the situation that the first movable plate 27 is prevented from being subjected to resistance and can not move continuously due to contact with the connection 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 when the first movable plate 27 and the second movable plate 33 can move smoothly in the bottom end sleeve 2 and the top end sleeve 3 respectively

Specifically, the front end of the bottom end cover 2 is provided with the first defrosting cover 28 in a hollow semi-circular truncated cone structure, the rear end face of the first defrosting cover 28 is provided with a slot 281, the plugboard 272 is inserted into and fixed in the slot 281, the first defrosting cover 28 is fixedly connected with the first movable plate 27, the periphery surface of the first defrosting cover 28 is provided with a plurality of shovel plates 282, when the first movable plate 27 reciprocates in the bottom end cover 2, the first movable plate 27 can drive the first defrosting cover 28 to move together, and the shovel plates 282 on the outer surface of the first defrosting cover 28 can continuously shovel frost on evaporator calandrias a result, and the purpose of defrosting is achieved. The outside of top cover 3 is provided with second defrosting cover 34, the shape of second defrosting cover 34 is the same with the shape of first defrosting cover 28, be equipped with on the second defrosting cover 34 with slot 281, shovel board 282 the same structure for after top cover 3 folds with bottom cover 2, second defrosting cover 34 can fold with first defrosting cover 28, make first fly leaf 27 drive when second fly leaf 33 moves can make together with second defrosting cover 34 carry out the relief off the frost on the evaporator calandria outside, need not the staff to use the mode of beating to get rid of the frost on evaporator calandria surface, reach the purpose of protection evaporator calandria, prevent the evaporator calandria from receiving the condition mode of beating and warping.

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

firstly, open the top cover 3 on the bottom cover 2 and laminate the bottom cover 2 to the bottom of evaporator calandria, fold the top cover 3 on the bottom cover 2 and screw butterfly bolt 24 and can make first lug 23 and second lug 32 be fixed together, thereby make bottom cover 2 and top cover 3 make up together and the cover is established in the outside of evaporator calandria, prevent bottom cover 2 and top cover 3 from coming off from evaporator calandria, then the staff will turn on rotating motor 131 and external power mutually, make rotating motor 131 begin work and drive pivot 13 rotation, make pivot 13 drive first bevel gear 132 rotate in cover groove 111, finally, along with the rotation of first bevel gear 132, first bevel gear 132 rotates runner 29 through second bevel gear 292, make runner 29 drive connecting rod 291's end constantly rotate, because the end of connecting rod 291 is eccentric form with the center of runner 29, make runner 29 can drive first movable plate 27 along movable cavity 22 through the connecting rod when rotating, prevent that top cover 3 and bottom cover 2 are in the state of folding mutually, then the staff will rotate motor 131 and external power, make rotating motor 131 start and drive pivot 13 rotate, make pivot 13 rotate in the cover 2 and make the first calandria second calandria 35 and take the motion of evaporator sleeve 2 take the defrosting mode simultaneously, can make the top cover 2 and the top cover can be removed in the mode that the evaporator sleeve is carried out in the reciprocal motion along the first calandria 35, and the evaporator sleeve is located in the outside of the evaporator 2, can make the reciprocal evaporator sleeve 28 and the end cover is broken, can be removed by the reciprocal motion by the reciprocal evaporator 2, and the evaporator is free from being moved by the face of the reciprocal evaporator sleeve 28, and the evaporator is free from being moved by the face of the evaporator, and the evaporator is completely required to be broken by the face.

The foregoing descriptions of specific exemplary embodiments of the present invention are 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 the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various 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. An evaporator defrosting device for a food storage freezer, comprising a holding rod (1), characterized in that: the defrosting device comprises a main body (34) and is characterized in that a bottom end sleeve (2) is arranged at the top end of a 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 calandria of a refrigeration house evaporator after being folded, a rotating shaft (13) is sleeved in the holding rod (1), a rotating motor (131) is coaxially connected to the bottom end of the rotating shaft (13), a first bevel gear (132) is coaxially connected to the top end of the rotating shaft (13), a first movable plate (27) is connected to the inner side of the bottom end sleeve (2) in a sliding mode, a first defrosting sleeve (28) which is in a hollow semi-circular table structure is arranged 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 tail end axle center of the connecting rod (291) and the axle center of the rotating wheel (29) are in an eccentric mode, a second bevel gear (292) is coaxially connected to the rotating wheel (29), a second bevel gear (292) is coaxially connected to the top end of the rotating shaft (13), a first bevel gear (132) is connected to the second bevel gear (27), a main body (3) is in the shape identical to the top end sleeve (3), and the top end of the main body (3) is in the shape of the defrosting sleeve (3) and the top end is in the shape identical to the shape of the main body (3; the movable cavity (22) with the semi-annular structure is arranged in the bottom end sleeve (2), the movable groove (221) communicated with the movable cavity (22) is formed in the front side surface of the bottom end sleeve (2), the first movable plate (27) is sleeved in the movable cavity (22), the front end of the first movable plate (27) is provided with an inserting plate (272), and the inserting plate (272) extends out of the movable groove (221).

2. The evaporator defrosting apparatus for a food storage freezer of claim 1 wherein: the top of holding pole (1) is equipped with footstock (11), set up cover groove (111) on the lateral wall of footstock (11), first bevel gear (132) are located in cover groove (111), the bottom of footstock (11) is equipped with base (12), bottom (121) are installed to the bottom of base (12), rotating electrical machines (131) are installed in base (12).

3. The evaporator defrosting apparatus for a food storage freezer of claim 1 wherein: the appearance of bottom cover (2) with top cover (3) all is semi-cylindrical structure, cover chamber (21) have been seted up on the top of bottom cover (2), a plurality of mounting grooves (211) have been seted up on the chamber wall in cover chamber (21), mounting groove (211) internal rotation is connected with a plurality of gyro wheels (212), when with bottom cover (2) cover is established in the calandria outside of freezer evaporator, gyro wheel (212) offset with the surface of calandria.

4. The evaporator defrosting apparatus for a food storage freezer of claim 1 wherein: the right edge department on bottom cover (2) top is equipped with first lug (23), the left edge department on bottom cover (2) top is equipped with a pair of hinge platform (26), the left edge department on top cover (3) top is equipped with hinge plate (31), hinge plate (31) stretch into two between hinge platform (26) and with hinge platform (26) are articulated, the right edge department on top cover (3) bottom is equipped with second lug (32), second lug (32) can with first lug (23) laminating together, the bottom of first lug (23) is equipped with butterfly bolt (24), the end of butterfly bolt (24) can with second lug (32) threaded connection.

5. The evaporator defrosting apparatus for a food storage freezer of claim 1 wherein: the bottom of bottom cover (2) is equipped with boss (25), offered cavity (251) in bottom cover (2), runner (29) are installed in cavity (251) and with boss (25) rotation is connected, second bevel gear (292) are located the outside of boss (25), footstock (11) are fixed on the rear side terminal surface of boss (25).

6. The evaporator defrosting apparatus for a food storage freezer of claim 1 wherein: the head end and the tail end of the first movable plate (27) are respectively provided with a supporting column (271), the cross section size of the supporting columns (271) is smaller than that of the first movable plate (27), a connecting seat (273) is arranged at the bottom end of the first movable plate (27), and the head end of the connecting rod (291) is hinged to the connecting seat (273).

7. The evaporator defrosting apparatus for a food storage freezer of claim 1 wherein: the novel defrosting device is characterized in that a slot (281) is formed in the rear end face of the first defrosting sleeve (28), a plurality of shovel plates (282) are arranged on the peripheral surface of the first defrosting sleeve (28), the shape of the second defrosting sleeve (34) is identical to that of the first defrosting sleeve (28), and the second defrosting sleeve (34) is provided with a structure identical to that of the slot (281) and the shovel plates (282).

8. The evaporator defrosting apparatus for a food storage freezer of claim 1 wherein: the top end sleeve (3) is provided with a structure identical to the sleeve cavity (21), the mounting groove (211), the roller (212), the movable cavity (22) and the movable groove (221), the main body of the second movable plate (33) is identical to the main body of the first movable plate (27), and the second movable plate (33) is provided with a structure identical to the support column (271) and the plugboard (272).