Anti-breaking protection structure for connection between temperature sensing rod and capillary

Abstract

The utility model provides a kind of temperature sensing rod and capillary connecting place anti-fracture protection structure, it is related to temperature controller technical field, including temperature sensing rod and capillary, the main body end of temperature sensing rod is equipped with the shrinkage portion of diameter tapering, the capillary is fixed in the end of the shrinkage portion by welding;It further includes tubular rivet that coaxial sleeve is equipped in the capillary outside, the inner diameter of tubular rivet and the outer diameter gap cooperation of the shrinkage portion;The capillary outlet end of tubular rivet is equipped with the annular lip of everted.This utility model's advantage is, by setting tubular rivet, its gap cooperation with temperature sensing rod shrinkage portion and suitable length design, can effectively disperse the stress of connecting place, reduce stress concentration;The annular lip of tubular rivet can avoid the damage of sharp edge to capillary, reduce the risk of capillary fracture at connecting place, prolong the service life of temperature control equipment, reduce maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of temperature controller technology, and in particular to a fracture-proof protection structure at the connection between the temperature sensing rod and the capillary tube. Background Technology

[0002] In industrial production and daily life, there is an urgent need for precise temperature control in equipment used in food processing, home appliances, medical devices, plastics manufacturing, environmental testing, and industrial electric heating. Temperature sensors and capillary thermostats are widely used due to their effective temperature control.

[0003] However, in existing technologies, the insufficient mechanical strength at the capillary connection between the temperature sensing rod and the capillary thermostat is a key obstacle to installation and application, mainly due to two factors: First, manufacturing defects. Since the connection between the temperature sensing rod and the capillary is often achieved through welding, the high-temperature melting and rapid cooling create a complex thermal stress distribution in the connection area. Non-uniform deformation during thermal expansion and contraction generates residual stress, reducing the mechanical properties of the connection area. Second, structural design defects. The acute-angled structure at the conical end of the temperature sensing rod creates a stress concentration point at the connection, weakening the fatigue and impact resistance of the welded area and making it susceptible to damage from external forces.

[0004] These structural weaknesses can easily lead to failure during installation: Firstly, improper bending can cause breakage. This can be affected by installation space limitations, improper operation, or human negligence, such as... Figure 1 As shown, capillary tubes are often bent at a 90° acute angle at the connection point. At this angle, the tube wall is subjected to stress far exceeding the yield strength, making it prone to breakage at stress concentration points, interrupting the flow of the working medium and pressure transmission within the thermostat. Secondly, excessive bending can lead to blockage. Even without breakage, severe bending can cause plastic wrinkles or collapse of the inner wall of the capillary, reducing or blocking the internal flow channels and hindering the normal flow of the medium.

[0005] Breakage or blockage can severely impair the core function of a temperature controller: the temperature sensor cannot accurately detect temperature, temperature signal transmission fails, causing the controlled equipment temperature to deviate from the set value, affecting process stability and equipment safety. Ultimately, such failures often force operators to replace the entire temperature controller module, increasing equipment operating costs and maintenance burden. Utility Model Content

[0006] This invention overcomes the shortcomings of the prior art by providing a fracture-proof protection structure at the connection between the temperature sensing rod and the capillary tube, which reduces the risk of capillary tube breakage at the connection, extends the service life of the temperature control equipment, and reduces maintenance costs.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] A fracture-prevention protection structure at the connection between a temperature sensing rod and a capillary tube includes a temperature sensing rod and a capillary tube. The main body of the temperature sensing rod has a tapered section with a gradually decreasing diameter at its end. The capillary tube is fixed to the end of the tapered section by welding. The structure also includes a tubular rivet coaxially sleeved on the outside of the capillary tube. The inner diameter D1 of the tubular rivet is clearance-fitted with the outer diameter D2 of the tapered section. The capillary tube outlet end of the tubular rivet has an outwardly turned annular lip.

[0009] Furthermore, the length L of the free segment of the tubular rivet satisfies: L≥D2.

[0010] Furthermore, the tubular rivet is fixed to the contracted portion by at least one welding point.

[0011] Furthermore, the welding points are 2 to 4 spot welds evenly distributed circumferentially.

[0012] Furthermore, the welding point is a continuous, circumferential laser weld.

[0013] Furthermore, the tubular rivet is made of austenitic stainless steel or copper alloy.

[0014] Furthermore, the surface of the annular lip is a smooth arc shape.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention, by setting a tubular rivet, with its gap fit with the contraction part of the temperature sensing rod and a suitable length design, can effectively disperse the stress at the connection and reduce stress concentration; the annular lip of the tubular rivet can avoid damage to the capillary from sharp edges, reduce the risk of capillary breakage at the connection, extend the service life of the temperature control equipment, and reduce maintenance costs. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of a traditional capillary tube bent at a 90° acute angle at the connection point;

[0019] Figure 2 This is a perspective view of the anti-breakage protection structure at the connection between the temperature sensing rod and the capillary tube of this utility model;

[0020] Figure 3 This is a schematic diagram of the tubular rivet in the separated state in the anti-breakage protection structure at the connection between the temperature sensing rod and the capillary tube of this utility model.

[0021] Figure 4This is a cross-sectional view of the anti-breakage protection structure at the connection between the temperature sensing rod and the capillary tube of this utility model.

[0022] In the picture:

[0023] 1. Temperature sensing rod; 2. Capillary tube; 3. Tubular rivet; 301. Annular lip; 4. Welding point. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] like Figures 2 to 4 As shown, this utility model requests protection for a fracture-resistant protective structure at the connection between a temperature sensing rod 1 and a capillary tube 2, which mainly consists of a temperature sensing rod 1, a capillary tube 2, and a tubular rivet 3. The purpose of this utility model is to enhance the strength of the connection between the temperature sensing rod 1 and the capillary tube 2 and prevent it from breaking during use.

[0026] Specifically, the main body of the temperature sensing rod 1 has a tapered section at its end with a gradually decreasing diameter. This tapered section design facilitates better connection with the capillary tube 2. The capillary tube 2 is fixed to the end of the tapered section by welding, ensuring a strong connection between the two. In actual operation, a suitable welding process can be used to ensure welding quality, enabling stable transmission of temperature signals between the temperature sensing rod 1 and the capillary tube 2.

[0027] It also includes a tubular rivet 3 coaxially sleeved on the outside of the capillary tube 2, with its inner diameter D1 and the outer diameter D2 of the contraction part being clearance-fitted. This fit ensures that the tubular rivet 3 can be smoothly fitted onto the contraction part while also providing a certain degree of tightness between the two, thereby effectively protecting the connection between the capillary tube 2 and the temperature sensing rod 1.

[0028] The capillary tube 2 outlet end of the tubular rivet 3 is provided with an outwardly turned annular lip 301. The surface of the annular lip 301 is designed to be a smooth arc shape, which can prevent scratches or damage to surrounding parts during use. When manufacturing the annular lip 301, processes such as stamping or rolling can be used to ensure the smoothness of its surface.

[0029] The length L of the free section of the tubular rivet 3 must satisfy L≥D2. This requirement ensures that the tubular rivet 3 provides sufficient protection at the connection between the capillary 2 and the temperature sensing rod 1. When the length of the tubular rivet 3 meets this condition, it can better distribute stress, reduce the impact of external forces on the connection, and thus improve the anti-breakage effect. In actual production, the length L of the tubular rivet 3 should be reasonably determined according to the outer diameter D2 of the contracted part of the temperature sensing rod 1.

[0030] The tubular rivet 3 can be fixed to the contracted part by at least one welding point 4. One fixing method is to use 2 to 4 circumferentially distributed spot welds. This spot welding method can reduce the thermal impact on the temperature sensing rod 1 and the tubular rivet 3 during the welding process while ensuring the fixing effect. When performing spot welding, it is necessary to control parameters such as welding current, welding time, and welding pressure to ensure the quality of the spot weld.

[0031] Another fixing method is to use a continuous, encircling laser weld. Laser welding has advantages such as high welding speed, high weld quality, and a small heat-affected zone. A continuous, encircling laser weld allows for a stronger connection between the tubular rivet 3 and the contracted portion, further improving the reliability of the fracture-resistant protective structure. When performing laser welding, it is necessary to select appropriate laser welding equipment and process parameters to ensure the quality of the laser weld.

[0032] In this embodiment, the tubular rivet 3 is made of austenitic stainless steel or copper alloy. Austenitic stainless steel has good corrosion resistance and strength, and can be used in various harsh environments; copper alloy has good electrical and thermal conductivity, and also has a certain degree of strength and corrosion resistance. In practical applications, the appropriate material can be selected according to the specific usage environment and requirements. For example, in humid or corrosive environments, tubular rivets 3 made of austenitic stainless steel can be preferred; while in situations where high electrical and thermal conductivity are required, tubular rivets 3 made of copper alloy can be selected.

[0033] This invention, by setting a tubular rivet 3, with its gap fit with the contraction part of the temperature sensing rod 1 and a suitable length design, can effectively disperse the stress at the connection and reduce stress concentration; the annular lip 301 of the tubular rivet 3 can avoid damage to the capillary 2 by the sharp edge, reduce the risk of the capillary 2 breaking at the connection, extend the service life of the temperature control equipment, and reduce maintenance costs.

[0034] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fracture-prevention protective structure at the connection between a temperature sensing rod and a capillary tube, characterized in that: The device includes a temperature sensing rod and a capillary tube. The main body of the temperature sensing rod has a tapered section with a gradually decreasing diameter at its end. The capillary tube is fixed to the end of the tapered section by welding. The device also includes a tubular rivet coaxially sleeved on the outside of the capillary tube. The inner diameter D1 of the tubular rivet is clearance-fitted with the outer diameter D2 of the tapered section. The capillary outlet end of the tubular rivet has an outwardly turned annular lip.

2. The temperature-sensing rod and capillary joint anti-breaking protection structure according to claim 1, characterized in that: The length L of the free section of the tubular rivet satisfies: L≥D2.

3. The temperature-sensing rod and capillary junction anti-breaking protection structure according to claim 1, characterized in that: The tubular rivet is fixed to the contracted portion by at least one welding point.

4. The temperature-sensing rod and capillary joint anti-breaking protection structure according to claim 3, characterized in that: The welding points are 2 to 4 spot welds evenly distributed circumferentially.

5. The temperature-sensing rod and capillary junction anti-breaking protection structure according to claim 3, characterized in that: The welding point is a continuous, circumferential laser weld.

6. The temperature-sensing rod and capillary junction anti-breaking protection structure according to any one of claims 1 to 5, characterized in that: The tubular rivets are made of austenitic stainless steel or copper alloy.

7. The anti-breakage protection structure at the connection between the temperature sensing rod and the capillary tube according to claim 1, characterized in that: The surface of the annular lip is a smooth arc shape.

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