CN2800190Y

CN2800190Y - Defrosting heater

Info

Publication number: CN2800190Y
Application number: CN 200520073055
Authority: CN
Inventors: 陆盘新
Original assignee: Suzhou Rongwei Industry & Trade Co Ltd
Current assignee: Suzhou Rongwei Industry & Trade Co Ltd
Priority date: 2005-06-23
Filing date: 2005-06-23
Publication date: 2006-07-26
Anticipated expiration: 2015-06-23

Abstract

The utility model relates to a defrosting heater, which comprises a pair of pipe joints, an inner layer glass tube arranged between the pipe joints and two conducting wires respectively inserted into each pipe joint. The inner part of the inner layer glass tube is provided with an electric heating wire and each conducting wire is respectively connected with both end parts of the electric heating wire. The outer side of the inner layer glass tube is sheathed with an outer layer glass tube. Both end parts of the outer layer glass tube are sheathed on the pipe joints. The defrosting heater is used in a defrosting process. The heating surface temperature of the outer layer glass tube is lower than the ignition point of flammable refrigerant. Fire accidents of the refrigerant can be prevented and the outer layer glass tube can be prevented from being cracked by cold and hot changes. The safety of the defrosting heater is increased.

Description

Defrost heater

Technical field

The utility model relates to a kind of Defrost heater.

Background technology

According to environmental requirement, refrigeration plant must adopt alternative chlorofluoro carbon, because most of alternative chlorofluoro carbon costs an arm and a leg, price is suitable, the R600a cold-producing medium of good refrigeration effect so generally adopt, but there is flammable characteristic that can be quick-fried in this cold-producing medium, and its burning-point is 462-477 ℃.What the evaporimeter of refrigeration system was subjected to moisture on every side in heat exchange, cooling procedure influences the meeting frosting, increase along with frosting degree, can hinder the heat-exchange capacity of evaporator surface and cause its cooling capacity to descend, therefore, usually on evaporimeter, adhere to Defrost heater, with to defrosting in the refrigeration plant, thereby guarantee the normal heat exchange of evaporimeter.

In the prior art, Defrost heater comprises the pair of pipes joint, be arranged at the single-glass pipe between the described pair of pipes joint and be inserted in two interior leads of each pipe joint respectively, in glass tube, be provided with heating wire, the both ends of heating wire are connected with each lead respectively, heating wire is delivered to heat on the glass tube, by glass tube refrigeration plants such as refrigerator are defrosted, and because the heating surface temperature of single-glass pipe is higher, easily reach the burning-point of combustible refrigerant, and in use, there is lower amount of refrigerant to reveal in the cooling cycle system of refrigeration plant unavoidably, so easily cause accident on fire, and easily explosion under the condensed water influence of single-glass pipe in refrigeration plant makes heating wire expose, thereby initiation potential accident.

Summary of the invention

The utility model purpose provides a kind of Defrost heater, and it can reduce the temperature of the heating surface of glass tube in defrost process, and can prevent the glass tube explosion.

For achieving the above object, the technical solution adopted in the utility model is: a kind of Defrost heater, comprise the pair of pipes joint, be arranged at inner layer glass tube between the described pair of pipes joint, be inserted in two leads in described each pipe joint respectively, be provided with heating wire in the described inner layer glass tube, described each lead is connected with the heating wire both ends respectively.The outside of described inner layer glass tube is with outer layer glass tube, and the both ends of described outer layer glass tube are enclosed within on the pipe joint.

Because technique scheme utilization, the utility model compared with prior art has following advantage: at the sheathed outer layer glass tube in the outside of inner layer glass tube, make this Defrost heater in defrost process, the heating surface temperature of its outer layer glass tube is lower than the burning-point of combustible refrigerant, can prevent cold-producing medium accident on fire, and can prevent that outer layer glass tube from because of cold and hot variation explosion, having strengthened the security of this Defrost heater.

Description of drawings

Accompanying drawing 1 is a main cutaway view of the present utility model;

Accompanying drawing 2 is looked enlarged drawing for the master of pipe joint of the present utility model;

Accompanying drawing 3 is the main cutaway view Amplified image of pipe joint of the present utility model;

Wherein: 1, heating wire; 2, inner layer glass tube; 3, outer layer glass tube; 4, pipe joint; 5, lead; 6, pawl shape convex tendon; 7, passage;

The specific embodiment

Referring to accompanying drawing 1, a kind of Defrost heater, comprise pair of pipes joint 4, be arranged at inner layer glass tube 2 between the described pair of pipes joint 4, be inserted in two leads 5 in described each pipe joint 4 respectively, be provided with heating wire 1 in the described inner layer glass tube 2, described each lead 5 is connected with heating wire 1 both ends respectively.The outside of described inner layer glass tube 2 is with outer layer glass tube 3, and the both ends of described outer layer glass tube 3 are enclosed within on the pipe joint 4, a segment distance a is arranged, 3.5 millimeters＜a＜5.5 millimeters between the outer wall of the inwall of described outer layer glass tube 3 and inner layer glass tube 2.

In the course of work of the present utility model, play the temperature buffer effect apart from a between outer layer glass tube 3 and the inner layer glass tube 2, make under the condensed water effect in refrigeration plants such as refrigerator, outer layer glass tube 3 can be kept away the excessive and explosion of the cold and hot range of temperature of face, and between outer layer glass tube 3 and the inner layer glass tube 2 make that apart from a this Defrost heater is worked under the situation of 1.15 times of rated voltages the time, the temperature on its outer layer glass tube 3 surfaces is lower than 394 ℃, far below the burning-point of combustible refrigerant.In addition, the wall thickness of outer layer glass tube 3 and inner layer glass tube 2 can be set to the 0.85-1.15 millimeter, makes that the intensity of this Defrost heater is guaranteed, can make it be difficult for producing the explosion of outer layer glass tube 3 again when variations in temperature.

Referring to accompanying drawing 3, on described pipe joint 4, have passage 7, to drain aqueous vapor and the gases at high pressure between outer layer glass tube 3 and the inner layer glass tube 2, can prevent inner layer glass tube 2 explosions.Referring to accompanying drawing 2 one accompanying drawings 3, have the radially pawl shape convex tendon 6 of projection on the external peripheral surface of described pipe joint 4, the external peripheral surface of the inner wall surface of described outer layer glass tube 3 and pawl shape convex tendon 6 fits.By cooperating of pawl shape convex tendon 6 and outer layer glass tube 3, can improve the sealing of outer layer glass tube 3, and reduced the contact area of pipe joint 4, caused outer layer glass tube 3 explosions with the elastic expansion that prevents the pipe joint 4 that elastomeric material is made with outer layer glass tube 3.

Claims

1, a kind of Defrost heater, comprise pair of pipes joint (4), be arranged at inner layer glass tube (2) between the described pair of pipes joint (4), be inserted in two leads (5) in described each pipe joint (4) respectively, be provided with heating wire (1) in the described inner layer glass tube (2), described each lead (5) is connected with heating wire (1) both ends respectively, it is characterized in that: the outside of described inner layer glass tube (2) is with outer layer glass tube (3), and the both ends of described outer layer glass tube (3) are enclosed within on the pipe joint (4).

2, Defrost heater according to claim 1 is characterized in that: between the outer wall of the inwall of described outer layer glass tube (3) and inner layer glass tube (2) a segment distance a is arranged, described a is the 3.5-5.5 millimeter.

3, Defrost heater according to claim 1, it is characterized in that: have the radially pawl shape convex tendon (6) of projection on the external peripheral surface of described pipe joint (4), the external peripheral surface of the inner wall surface of described outer layer glass tube (3) and pawl shape convex tendon (6) fits.

4, Defrost heater according to claim 1 is characterized in that: have passage (7) on the described pipe joint (4).