CN2746331Y

CN2746331Y - Defrost heater

Info

Publication number: CN2746331Y
Application number: CNU2004200096148U
Authority: CN
Inventors: 前田利树; 森川行男
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2003-10-23
Filing date: 2004-10-25
Publication date: 2005-12-14
Anticipated expiration: 2014-10-25
Also published as: WO2005040703A1; CN100400992C; JP2005127603A; JP3552715B1; CN1609538A; TW200519340A

Abstract

The utility model relates to a defrosting heater (20) for melting frost deposited and accumulated on a cooler. The defrosting heater (20) is provided with a glass tube (23), a heater wire (21) constructed from a metal resistance body and installed in the glass tube (23), bolts (22) in which conducting wire insertion holes are formed and which are covered on openings at both ends of the glass tube (23), and a conducting wire (24) passing through the conducting wire insertion holes (22a) and connected to the end of the heater wire (21). Because projections (22b, 22c) are arranged on the inner wall surfaces of the conducting wire insertion holes (22a) of the bolts (22), and the diameter of each of the conducting wire insertion holes (22a) is smaller than the outer diameter of the conducting wire (24), when the conducting wire (24) is inserted, the gaps between the bolts (22) and the conducting wire (24) are sealed to prevent outside air from entering from the gaps between the conducting wire (24) and the bolts (22) and prevent the corrosion and breakage of the heater wire (21) in advance.

Description

Defrost heater

Technical field

The utility model relates to the Defrost heater of the frost that adheres to, piles up in a kind of cooler of the kind of refrigeration cycle that is melted in freezer etc.

Background technology

As the existing Defrost heater that uses in freezer, for example the flat 8-54172 communique of Japanese Patent Application Laid-Open is disclosed, is the kuromore silk is curved coiled type and to be covered by glass tube.

Below, with reference to the above-mentioned existing Defrost heater of description of drawings.Fig. 4 is the profilograph of the major part of existing freezer.In Fig. 4, freezer main body 1 is provided with: the evaporimeter partition wall 12 of the refrigerating chamber suction inlet 7 of air, the refrigerating chamber suction inlet 8 that sucks air in the refrigerating chamber 3, exhaust outlet 9, the evaporimeter 10 of discharging cold air, the fan 11 that makes circulating cold air, separation evaporimeter 10 and refrigerating chamber 2 in refrigerating chamber 2, refrigerating chamber 3, refrigerating chamber door 4, refrigerating-chamber door 5, the partition wall 6 of separating refrigerating chamber 2 and refrigerating chamber 3, the suction refrigerating chamber 2.

Below evaporimeter 10, be provided with: Defrost heater 20, it is covered by glass tube and makes the kuromore silk form the heater strip of coiled type; Top cover 16, it prevents the evaporation noise that directly produces in defrost water when Defrost heater 20 drips and contacts; Base plate 17, it is metal.In addition, the defrost water of being compiled by bucket 13 is discharged by discharge outlet 14.

The below as above action of the existing Defrost heater of formation of explanation.When cooling refrigerating chamber 2 and refrigerating chamber 3, cold-producing medium circulates in evaporimeter 10 and cools off evaporimeter 10.Therewith in the same manner, action by fan 11, the intensification air of refrigerating chamber 2 and refrigerating chamber 3 is delivered to cooling chamber from refrigerating chamber suction inlet 7 and refrigerating chamber suction inlet 8, carry out heat exchange and cool off by evaporimeter 10, deliver in the refrigerating chamber 2 from outlet 9, by not shown connected entrance cold wind is delivered to refrigerating chamber from refrigerating chamber 2.

At this, because the air that carries out heat exchange with evaporimeter 10 is the high temperature outside air to be flowed into and the evaporation of the moisture that contained by the food that is kept in refrigerating chamber 2 and the refrigerating chamber 3 etc. and the air of high humilityization by the switching by refrigerating chamber door 4 and refrigerating-chamber door 5, so airborne moisture frosting and adhere to or pile up on the evaporimeter 10 lower than this air themperature, hinder the surface of evaporimeter 10 along with the increase of accumulating amount and will carry out the heat transfer of the air of heat exchange, form flowing resistance simultaneously and air quantity is descended, so overall heat-transfer coefficient descends and the generation cooling is insufficient.

Therefore, the kuromore silk to Defrost heater 20 is switched on before the formation cooling is insufficient.If being begun energising, the kuromore silk then radiates heat ray to evaporimeter 10 and peripheral part from the kuromore silk.At this moment, the heat ray that emits to base plate 17 reflexes to heater strip owing to the shape of base plate 17 with a part, and other parts are towards evaporimeter 10 and other peripheral part reflection.Thus, near the frost that will adhere to evaporimeter 10 and bucket 13 and discharge outlet 14 is fused into water.

In addition, like this defrost water of fusing, a part directly falls in the bucket 13, and other then utilize top cover 16 and avoid Defrost heater 20 and fall in the bucket 13 and from discharge outlet 14 and discharge outside the storehouses.

Yet, as shown in Figure 5, in above-mentioned existing structure, heating owing to heater 20 when defrosting makes in the glass tube 23 of temperature rising, if the temperature that stops in heater strip 21 is switched on glass tube 23 then descends, glass tube 23 interior pressure also descend simultaneously, thereupon, invade in the glass tube 23 because of the inboard of glass tube 23 and the pressure differential in the outside attached to the part of the defrost water between the slit of lead 24 and bolt 22 during defrosting, might corrode heater strip 21 and make its disconnection.

The utility model content

The utility model is developed for solving above-mentioned existing problem, its purpose be to provide a kind of when defrosting finishes defrost water do not invade Defrost heater in the glass tube.

In order to solve above-mentioned existing issue, the utility model provides a kind of Defrost heater, it is characterized in that the bolt of the both ends open portion of heater strip, the lead that connects heater strip that it has glass tube, be made of the metallic resistance that is arranged on glass tube inside, the lead patchhole that is formed for inserting lead and cover glass pipe.Be provided with a plurality of projections on the internal face of the lead patchhole of bolt, the lead patchhole diameter of jut is littler than the external diameter of lead when not inserting lead.Projection is crimped on the outer peripheral face of lead and the gap of sealing bolt and lead when inserting lead, a plurality of projections are arranged to have certain interval simultaneously, this is set to: even make when forming the gap between a projection and the lead applying the external force that is produced by lead wire, also can seal the gap with lead by other projection.

Thus, invade in the glass tube from the gap of bolt and lead even when Defrost heater is installed, lead applied the external force extraneous air that also can prevent to defrost when finishing.In addition, the cover layer of lead and the material of bolt all use silicone rubber, can further improve the cover layer of lead and the sealing of projection, and seal clearance more reliably.

Defrost heater of the present utility model has can prevent in advance that extraneous air from invading from the gap of bolt and lead in the glass tube and the effect that the heater strip burn into is disconnected.

Description of drawings

Fig. 1 is the major part profile of the Defrost heater of the utility model embodiment;

Fig. 2 is the profile of bolt of the Defrost heater of embodiment shown in Figure 1;

Fig. 3 is to use the sketch map of refrigeration system of freezer of the Defrost heater of embodiment shown in Figure 1;

Fig. 4 is the signal profilograph with freezer of existing Defrost heater;

Fig. 5 is the profile of the bolt of existing Defrost heater shown in Figure 4.

The specific embodiment

The bolt of the both ends open portion of heater strip, the lead that connects heater strip that the Defrost heater of embodiment of the present utility model has glass tube, be made of the metallic resistance that is arranged on glass tube inside, the lead patchhole that is formed for inserting lead and cover glass pipe.The cover layer of bolt and lead is a silicone rubber.On the internal face of the lead patchhole of bolt, a plurality of projections are set, the lead patchhole diameter of jut is littler than the external diameter of lead when not inserting lead, projection is crimped on the outer peripheral face of lead and the gap of sealing bolt and lead when inserting lead, simultaneously, a plurality of projections are arranged to have certain intervals, and this is set to: though apply the external force that produces by lead wire and make also can seal when forming the gap between a projection and the lead by other projections and lead between the gap.By such structure, also can stop extraneous air to be invaded in the glass tube from the gap of bolt and lead even when Defrost heater is installed, lead is applied external force.

In addition, because the material of the cover layer of lead and bolt all is a silicone rubber, thus can make the silanol group on the surface of the cover layer of lead and projection form contact condition generation molecular reaction and improve adhesiveness, and seal clearance more reliably.

In addition, in the above-described embodiments, be set at 0.76 times to 0.96 times of external diameter of lead by aperture, can make the operation that lead is inserted in the bolt become easy the lead patchhole of jut, and, can stop extraneous air to be invaded in the glass tube reliably from the gap of bolt and lead.

In addition, in the above-described embodiments, 0.2 times to 1.2 times of external diameter by a plurality of projections width separately being set at lead can make the operation that lead is inserted in the bolt become easily, and can stop extraneous air to be invaded in the glass tube from the gap of bolt and lead reliably.

And then, Defrost heater in the above-described embodiments, thereby the security when defrosting can be improved in the below of the evaporimeter by being arranged on the kind of refrigeration cycle of using combustible refrigerant.

Following use figure further describes embodiment of the present utility model.In addition, this embodiment does not limit the utility model.

Fig. 1 is the major part profile of the Defrost heater of the utility model embodiment; Fig. 2 is the profile of bolt of the Defrost heater of embodiment shown in Figure 1; Fig. 3 is to use the sketch map of refrigeration system of freezer of the Defrost heater of embodiment shown in Figure 1.

As shown in Figure 1, Defrost heater 20 is made of the bolt 22 of the silicone rubber system of the heater strip 21 that resistance wire is curved coiled type, the glass tube 23 that covers heater strip 21, cover glass pipe 23 both ends open portions, tectal lead 24 with the silicone rubber system that connects heater strip 21.

Fig. 2 is the profile of the bolt 22 of silicone rubber system.As shown in Figure 2, on the internal face of the lead patchhole 22a mesopore of the bolt 22 of silicone rubber system, be provided with

projection

22b, 22c.

In the present embodiment, under the state that does not insert lead 24, will be set at 0.76 times to 0.96 times of wire diameter A because of projection 22b, the narrow aperture C of 22c stenosis.When lead 24 was inserted lead patchhole 22a,

projection

22b, 22c were crimped on the outer peripheral face of lead 24, thus the gap of the bolt 22 of salable lead 24 and silicone rubber system.

By setting the aperture B of lead patchhole 22a than wire diameter A biglyyer, and the width D of projection 22b and the width E of projection 22c be set at 0.2 times to 1.2 times of wire diameter A, thereby can easily lead 24 be inserted in the bolts 22.

In addition, by a plurality of

projection

22b, 22c are set with proper spacing, even stress application when guiding lead 24 to link position, and forming under the situation in gap between projection 22b and the lead 24, the gap of this projection 22c and lead 24 also can be sealed by next projection 22c.Therefore, even the deviations when Defrost heater 20 is installed etc. apply external force to lead 24, the also gap of the bolt 22 of sealed guide 24 and silicone rubber system reliably.

In addition, because the material of the cover layer of lead 24 and bolt 22 all is a silicone rubber, so can make the silanol group on the silanol group on surface of lead 24 and

projection

22b, 22c surface under state of contact, have and can make the intermolecular reaction on surface, can improve the adhesiveness of lead 24 and

projection

22b, 22c, more reliably seal clearance.

In Fig. 3, be sealed with combustible refrigerant in the functional inside filling that is connected with the kind of refrigeration cycle of compressor 60, condenser 61, the mechanism of decompressor 62 and evaporimeter 10.

The below as above action of the Defrost heater of formation of explanation.Running by compressor 60 makes evaporimeter 10 coolings of kind of refrigeration cycle, makes the evaporimeter 10 of air through being cooled in the refrigeration Kuku by the fan 11 that moves simultaneously with the running of compressor 60.Then, in the storehouse, discharge the cold air that has carried out heat exchange with evaporimeter 10.The operating condition of such compressor 60 continues random time.Shut down through compressor 60 after this random time.At this moment, simultaneously by 24 pairs of heater strips of lead 21 energising and Defrost heater 20 heatings are defrosted.

If stop to heater strip 21 energisings, then the reduction because of the temperature in the glass tube 23 also reduces the pressure in the glass tube, but this moment is because by the bolt 22 of projection 22b, the 22c sealing silicone rubber system of the bolt 22 of silicone rubber system and the gap of lead 24, so extraneous air can not invaded in glass tube 23 from this part.

Claims

1. Defrost heater, it is characterized in that, it has glass tube, the heater strip that constitutes by the metallic resistance that is arranged on described glass tube inside, the lead that connects described heater strip, the bolt that is formed for inserting the lead patchhole of described lead and covers the both ends open portion of described glass tube, on the internal face of the described lead patchhole of described bolt, a plurality of projections are set, the described lead patchhole diameter of described jut is littler than the external diameter of described lead when not inserting described lead, described projection is crimped on the outer peripheral face of described lead and seals the gap of described bolt and described lead when inserting described lead, a plurality of described projections are arranged to certain interval simultaneously, this is set to: form under the situation in gap between a described projection and described lead even make applying the external force that is produced by the described lead of guiding, also can seal the gap with described lead by other described projection.

2. Defrost heater as claimed in claim 1 is characterized in that the cover layer of described bolt and described lead is a silicone rubber.

3. Defrost heater as claimed in claim 1 is characterized in that, the aperture of described jut is 0.76 times to 0.96 times of external diameter of described lead.

4. Defrost heater as claimed in claim 3 is characterized in that, the width of described projection is 0.2 times to 1.2 times of external diameter of described lead.

5. as each described Defrost heater in the claim 1 to 4, it is characterized in that it is arranged on the below of the evaporimeter of the kind of refrigeration cycle of using combustible refrigerant.