CN110553750A

CN110553750A - Electronic temperature probe and manufacturing method thereof

Info

Publication number: CN110553750A
Application number: CN201810557537.6A
Authority: CN
Inventors: 方维民
Original assignee: Shenzhen Ke Min Sensitive Element Technology Co Ltd
Current assignee: Shenzhen Ke Min Sensitive Element Technology Co Ltd
Priority date: 2018-06-01
Filing date: 2018-06-01
Publication date: 2019-12-10

Abstract

The invention discloses an electronic temperature probe, which comprises a metal protection tube, a thermistor component, a first handle, a silica gel wire, a copper strip, an insulating envelope, a second handle and a DC plug, wherein the metal protection tube is connected with the thermistor component; the thermistor assembly is provided with a thermistor, the first protective sleeve and a second protective sleeve; also provides a method for manufacturing the electronic temperature probe; the invention has the beneficial effects that: the product is suitable for a temperature sensor of an electric oven; the temperature-sensing sensor has the advantages of high temperature resistance, tight sealing, no dampness, good temperature-sensing sensitivity, simple structure and easy production.

Description

Electronic temperature probe and manufacturing method thereof

Technical Field

The invention relates to the technical field of temperature sensors, in particular to an electronic temperature probe and a manufacturing method thereof.

Background

With the development of the times and the progress of science and technology, the electric oven has entered the families of common people, becomes a kitchen type electric appliance product which can fast bake food, change cooking modes and adapt to the rhythm of life, and is increasingly popular and touted by young people.

The electronic temperature probe is an important component of a heating unit of a large-sized high-end electric oven, and is used for detecting the actual temperature and the cooking degree of food, particularly meat food, in the electric oven and transmitting information about the temperature of the food detected by the electronic temperature probe to a temperature control unit of the electric oven, and the temperature control unit increases, decreases or terminates the actual operating temperature of the heating unit of the electric oven according to the received information. At present, the electronic temperature probes on the market have complex structures, the high-temperature aging performance of the plug and the silica gel wire is poor, the reliability is low, and the plug rubber and the silica gel wire are easy to discolor, harden and become brittle after high-temperature aging. In particular, the handles at the two ends of the electronic temperature probe are usually made by injection molding process by most manufacturers. Although the injection molding process can ensure the integrity of the handle and the wire to the maximum extent and ensure that the tensile test index of the handle meets the design requirement, the method has certain disadvantages, wherein after the covering material wraps the base material, because the mechanical strength and the chemical bonding strength of the two materials cannot be completely the same, the melting points of the two materials may also have difference, a small amount of the covering material overflows from the end part of the injection molding joint, burrs are generated, and the end part is not flat. Meanwhile, the components and contents of the covering material and the base material cannot be completely the same, and a layered structure is easily generated. In addition, in a common electronic temperature probe, an insulating material used for a DC plug generally has the defects of poor high temperature resistance, small adhesive force and low tensile strength, so that the adhesion between a metal piece of the DC plug and the insulating material is insufficient, and a gap or a crack is easy to occur.

Disclosure of Invention

The invention mainly solves the technical problem of providing an electronic temperature probe and a manufacturing method thereof, wherein the electronic temperature probe has the advantages of high temperature resistance, tight sealing, no dampness, good temperature sensing sensitivity, simple structure and easy production.

In order to solve the above problems, the present invention provides an electronic temperature probe, which comprises a metal protection tube, a thermistor assembly, a first handle, a silica gel wire, a copper strip, an insulating envelope, a second handle, and a DC plug; the thermistor assembly is provided with a thermistor, the first protective sleeve and a second protective sleeve, the first protective sleeve penetrates through one pin of the thermistor, and the thermistor and the first protective sleeve are arranged in the second protective sleeve; the silicon rubber wire comprises two wires inside, and a layer of metal copper mesh is doped in the middle; one end of the lead is pressed with the pin of the thermistor together through the copper strip; the thermistor assembly is arranged in the metal protection pipe; the other end of the lead is connected with two electrodes of the DC plug, and the joint of the lead and the two electrodes of the DC plug is packaged by an insulating envelope; the first handle is sleeved at the opening end of the metal protection pipe, and the second handle is sleeved at the outer part of the insulating sleeve.

Furthermore, the thermal thermistor is a single-ended glass-encapsulated negative temperature coefficient thermistor.

Furthermore, the first protective sleeve and the second protective sleeve are made of polytetrafluoroethylene, are halogen-free non-heat-shrinkable sleeves and are colorless and transparent in color.

Further, the thermistor assembly is arranged at the tip end in the metal protection tube, and the metal protection tube and the silica gel wire are connected into a whole in a pressing mode at the opening end of the metal protection tube.

Furthermore, the DC plug is provided with a metal piece and a plastic piece; the metal piece is made of brass, and the surface of the metal piece is plated with nickel; the plastic part is a mixture of water-soluble polytetrafluoroethylene material and glass fiber.

Furthermore, the insulating envelope is a mixture of polyphenylene sulfide materials and glass fibers, and is formed by injection molding through a special injection molding machine, an auxiliary device and a tool clamp.

Furthermore, the metal protection tube is made of food-grade stainless steel, and the surface of the metal protection tube is passivated.

Furthermore, the first handle and the second handle are made of food-grade silica gel and are brown in color.

Furthermore, the contact parts of the first handle and the second handle and the silica gel line are coated with high-strength silica gel adhesive.

The invention also provides a manufacturing method of the electronic temperature probe, which comprises the following steps:

a. Material shearing: according to design requirements, a special shearing tool is adopted to respectively shear two pins of the thermistor to required lengths; respectively cutting the first protective sleeve and the second protective sleeve to required lengths; and cutting the silica gel wire by adopting a special wire cutting machine, arranging the cut copper mesh, and stripping and wicking the wires inside.

b. Penetrating a protective sleeve I: and (c) threading a long pin of the thermistor after the step (a) on the first protective sleeve after the step (a).

c. And (3) copper strip compression joint: and (c) connecting the pin of the thermistor obtained after the step (b) with the lead obtained after the step (a) by using a special crimping machine through a copper belt.

d, DC plug connection: and d, performing spot welding and pressure welding on the other end of the lead after the step c and a corresponding electrode of the DC plug through an electric welding machine and a pressure welding machine according to design requirements.

e. And (3) penetrating a protective sleeve II: and (c) penetrating the thermistor and the first protective sleeve after the step (d) into the second protective sleeve after the step (a), wherein the second protective sleeve completely covers the thermistor, the first protective sleeve and the copper strip.

f. Coating heat-conducting silicone grease: and e, coating a proper amount of heat-conducting silicone grease on the glass temperature-sensing head of the thermistor after the step e by adopting a special coating tool.

g. Crimping the metal protection pipe: and f, placing the thermistor in the tip part in the metal protective tube, and performing compression joint by adopting a special compression joint device and a tool clamp to form a firm whole.

h.dc plug encapsulation: and g, performing injection molding and packaging on the joint of the DC plug and the lead after the step g by adopting a special injection molding machine, an auxiliary device and a tool clamp to form an insulating envelope.

i. Handle positioning: according to design requirements, a special device and a tool clamp are adopted, the first handle is positioned on the metal protection tube after the step h, and the second handle is positioned on the DC plug after the step h.

j. Bonding a handle: and (3) coating a proper amount of high-viscosity silica gel adhesive on the contact parts of the first handle and the second handle after the step i and the silica gel line by adopting a special tool clamp.

k. And (4) checking: and (4) according to design requirements, carrying out appearance inspection, withstand voltage test and resistance test on the finished product obtained in the step j.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the metal protection tube of the present invention;

The objectives, features, and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1 and 2, the electronic temperature probe comprises a metal protection tube 1, a thermistor component 2, a first handle 3, a silica gel wire 4, a copper strip 5, an insulating envelope 6, a second handle 7 and a DC plug 8; the thermistor assembly 2 is provided with a thermistor 21, the first protective sleeve 22 and a second protective sleeve 23, one pin of the thermistor 21 penetrates through the first protective sleeve 22, and the thermistor 21 and the first protective sleeve 22 are arranged in the second protective sleeve 23; the silicon rubber wire 4 is internally provided with two wires 40, and a layer of metal copper mesh is doped in the middle; one end of the lead 40 is pressed with the pin of the thermistor 21 through the copper strip 5; the thermistor component 2 is arranged in the metal protection pipe 1; the other end of the lead wire 40 is connected with two electrodes of the DC plug 8, and the connection part is encapsulated by the insulating envelope 6; the first handle 3 is sleeved at the opening end of the metal protection tube 1, and the second handle 7 is sleeved at the outer part of the insulating sleeve 6.

As shown in fig. 2, the thermistor 21 is a single-ended glass-encapsulated negative temperature coefficient thermistor.

As shown in fig. 2, the first protective sleeve 5 and the second protective sleeve 6 are made of teflon, and are halogen-free non-heat shrinkable sleeves, and are colorless and transparent.

As shown in fig. 1 and 2, the thermistor assembly 2 is disposed at a tip end inside the metal protection tube 1, and the metal protection tube 1 and the silicone wire 4 are crimped into one piece at an open end of the metal protection tube 1.

As shown in fig. 1, the DC plug 8 is provided with metal members or plastic members; the metal piece is made of brass, and the surface of the metal piece is plated with nickel; the plastic part is a mixture of water-soluble polytetrafluoroethylene material and glass fiber.

As shown in fig. 1, the insulating envelope 6 is a mixture of polyphenylene sulfide material and glass fiber, and is formed by injection molding through a special injection molding machine, an auxiliary device and a tool clamp.

As shown in fig. 1, the metal protection tube 1 is made of food grade stainless steel, and the surface thereof is passivated.

As shown in fig. 1, the first handle 3 and the second handle 7 are made of food-grade silica gel and are brown in color.

As shown in fig. 1, the contact portions of the first handle 3 and the second handle 7 with the silicone thread 4 are coated with a high-strength silicone adhesive.

The embodiment also provides a manufacturing method of the electronic temperature probe, as shown in fig. 1 and 2, comprising the following steps:

a. Material shearing: according to design requirements, a special shearing tool is adopted to respectively shear two pins of the thermistor 21 to required lengths; respectively cutting the first protective sleeve 22 and the second protective sleeve 23 to required lengths; and cutting the silica gel wire 4 by using a special wire cutting machine, arranging the cut copper mesh, and stripping and tin dipping the lead 40 inside.

b. Penetrating a protective sleeve I: after step a, a long pin of the thermistor 21 is inserted into the first protective sleeve 22 after step a.

c. And (3) copper strip compression joint: and (c) connecting the pin of the thermistor 21 after the step (b) with the lead 40 after the step (a) through a copper belt 5 by using a special crimping machine.

d, DC plug connection: and c, performing spot welding and pressure welding on the other end of the lead 40 after the step c and the corresponding electrode of the DC plug 8 through an electric welding machine and a pressure welding machine according to design requirements.

e. And (3) penetrating a protective sleeve II: and (c) threading the thermistor 21 and the first protective sleeve 22 after the step (d) on the second protective sleeve 23 after the step (a), wherein the second protective sleeve 23 completely covers the thermistor 21, the first protective sleeve 22 and the copper strip 5.

f. Coating heat-conducting silicone grease: and e, coating a proper amount of heat-conducting silicone grease on the glass temperature-sensing head of the thermistor 21 after the step e by using a special coating tool.

g. Crimping the metal protection pipe: and f, placing the thermistor 21 in the tip part in the metal protection tube 1, and performing compression joint by using a special compression joint device and a tool fixture to form a firm whole.

h.dc plug encapsulation: and g, performing injection molding and packaging on the connection part of the DC plug 8 and the lead 40 after the step g by adopting a special injection molding machine, an auxiliary device and a tool clamp to form the insulating envelope 6.

i. Handle positioning: according to design requirements, a special device and a tool clamp are adopted, the first handle 3 is positioned on the metal protection pipe 1 after the step h, and the second handle 7 is positioned on the DC plug 8 after the step h.

j. Bonding a handle: and (3) coating a proper amount of high-viscosity silica gel adhesive on the contact parts of the first handle 3 and the second handle 7 after the step i and the silica gel line 4 by adopting a special tool clamp.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments without departing from the spirit or scope of the present invention.

Claims

1. an electronic temperature probe is characterized by comprising a metal protection tube (1), a thermistor component (2), a first handle (3), a silica gel wire (4), a copper strip (5), an insulating sleeve (6), a second handle (7) and a DC plug (8); the thermistor assembly (2) is provided with a thermistor (21), a first protective sleeve (22) and a second protective sleeve (23), one pin of the thermistor (21) penetrates through the first protective sleeve (22), and the thermistor (21) and the first protective sleeve (22) are arranged in the second protective sleeve (23); the silicon rubber wire (4) is internally provided with two wires (40), and a layer of metal copper mesh is doped in the middle; one end of the lead (40) is pressed with the pin of the thermistor (21) through the copper strip (5); the thermistor component (2) is arranged in the metal protection pipe (1); the other end of the lead (40) is connected with two electrodes of the DC plug (8), and the connection part is encapsulated by an insulating envelope (6); the first handle (3) is sleeved at the opening end of the metal protection pipe (1), and the second handle (7) is sleeved at the outer part of the insulating sleeve (6).

2. An electronic temperature probe according to claim 1, wherein the thermistor (21) is a single-ended glass-encapsulated negative temperature coefficient thermistor.

3. The electronic temperature probe according to claim 1, wherein the first protective sleeve (5) and the second protective sleeve (6) are made of polytetrafluoroethylene, are halogen-free non-heat shrinkable sleeves, and are colorless and transparent.

4. The electronic temperature probe according to claim 1, characterized in that the thermistor assembly (2) is placed at the tip inside the protective metal tube (1) and at the open end of the protective metal tube (1) and the silicone wire (4) are crimped as one piece.

5. The electronic temperature probe according to claim 1, wherein the DC plug (8) is provided with a metal, plastic part; the metal piece is made of brass, and the surface of the metal piece is plated with nickel; the plastic part is a mixture of water-soluble polytetrafluoroethylene material and glass fiber.

6. The electronic temperature probe according to claim 1, wherein the insulating envelope (6) is a mixture of polyphenylene sulfide material and glass fiber, which is injection molded by a dedicated injection molding machine, an auxiliary device and a tooling fixture.

7. the electron temperature probe according to claim 1, wherein the metallic protection tube (1) is made of food grade stainless steel and has a surface passivated.

8. The electronic temperature probe according to claim 1, wherein the first handle (3) and the second handle (7) are made of food grade silica gel and have a brown color.

9. The electronic temperature probe according to claim 1, wherein the contact portions of the first handle (3) and the second handle (7) with the silicone thread (4) are coated with a high-strength silicone adhesive.

10. The method of claim 1, comprising the steps of:

a. Material shearing: according to design requirements, a special shearing tool is adopted to respectively shear two pins of the thermistor (21) to required lengths; respectively cutting the first protective sleeve (22) and the second protective sleeve (23) to required lengths; and a special wire cutting machine is adopted to cut the silica gel wire (4), the cut copper mesh is arranged, and the head stripping and tin immersion treatment are carried out on the wire (40) inside.

b. penetrating a protective sleeve I: and (b) threading a long pin of the thermistor (21) after the step (a) on the first protective sleeve (22) after the step (a).

c. And (3) copper strip compression joint: and (c) connecting the pin of the thermistor (21) after the step (b) with the lead (40) after the step (a) through a copper belt (5) by using a special crimping machine.

d, DC plug connection: and c, performing spot welding and crimping on the other end of the lead (40) after the step c and a corresponding electrode of the DC plug (8) through an electric welding machine and a crimping machine according to design requirements.

e. And (3) penetrating a protective sleeve II: and (c) threading the thermistor (21) and the first protective sleeve (22) after the step (d) with the second protective sleeve (23) after the step (a), wherein the second protective sleeve (23) completely covers the thermistor (21), the first protective sleeve (22) and the copper strip (5).

f. coating heat-conducting silicone grease: and e, coating a proper amount of heat-conducting silicone grease on the glass temperature sensing head of the thermistor (21) after the step e by adopting a special coating tool.

g. crimping the metal protection pipe: and f, placing the thermistor (21) in the tip part in the metal protection tube (1) after the step f, and performing compression joint by adopting a special compression joint device and a tool clamp to form a firm whole.

h.dc plug encapsulation: and g, performing injection molding and packaging on the joint of the DC plug (8) and the lead (40) after the step g by adopting a special injection molding machine, an auxiliary device and a tool clamp to form an insulating envelope (6).

i. Handle positioning: according to design requirements, a special device and a tool clamp are adopted, the first handle (3) is positioned on the metal protection tube (1) after the step h, and the second handle (7) is positioned on the DC plug (8) after the step h.

j. Bonding a handle: and (3) coating a proper amount of high-viscosity silica gel adhesive on the contact parts of the first handle (3) and the second handle (7) and the silica gel wire (4) after the step i by adopting a special tool clamp.