Table joint welding structure and resistance welding method of IoT smart gas meter shell

Abstract

The present invention discloses a meter joint welding structure of an IoT smart gas meter housing, comprising a joint body and a gasket for welding with the joint body, wherein a first convex ring is arranged at one end of the joint body welded with the gasket, and a second convex ring is arranged on one side surface of the gasket; the first convex ring and the second convex ring match each other. The purpose of the present invention is to provide a meter joint welding structure of an IoT smart gas meter housing and a resistance welding method thereof, so as to solve the problem of high scrap rate when welding the meter joint and the gasket of the gas meter housing in the prior art, and to achieve the purpose of improving welding sealing and stability and reducing scrap rate.

Description

Technical Field

[0001] The invention relates to the field of gas meter shell production, and in particular to a meter joint welding structure of an Internet of Things smart gas meter shell and a resistance welding method thereof. Background Art

[0002] The outer shell of the IoT gas meter is an installation tool for the gas meter valve core, metering components, etc. It is an essential component of the gas meter and is required by every user terminal, so the demand is huge. The outer shell of the IoT gas meter is equipped with a meter joint for connecting to the gas pipeline, and a gasket needs to be connected to the meter joint. The more advanced gasket connection method in the prior art is to use resistance welding, in which a circle of flanges is set on the meter joint, and the gasket and the flange are directly resistance welded. However, the welding of the gas meter joint must ensure sufficient sealing, and a pressure test must be carried out after welding to verify the sealing, otherwise there will be great safety hazards when using it. This existing welding method still has a scrap rate of about 8% to 10%. Summary of the invention

[0003] The purpose of the present invention is to provide a table joint welding structure of the casing of an Internet of Things smart gas meter and a resistance welding method thereof, so as to solve the problem of high scrap rate when welding the table joint and the gasket of the casing of the gas meter in the prior art, and to achieve the purpose of improving the welding sealing and stability and reducing the scrap rate.

[0004] The present invention is achieved through the following technical solutions:

[0005] The meter joint welding structure of the IoT smart gas meter shell includes a joint body and a gasket for welding with the joint body. A first convex ring is arranged at one end of the joint body welded with the gasket, and a second convex ring is arranged on a side of the gasket close to the first convex ring; the first convex ring and the second convex ring match each other.

[0006] In view of the problem of high scrap rate when welding the table joint and gasket of the gas meter shell in the prior art, the present invention proposes a table joint welding structure of the IoT smart gas meter shell. In the installation process of the existing gas meter shell, the joint body needs to be welded to the gas meter shell. The present invention adds a gasket to assist welding, and sets a first convex ring on the joint body, and a second convex ring on the gasket, wherein the first convex ring and the second convex ring match each other, which means that the two can contact and cooperate with each other during the welding process and are welded together as the current transmission medium of resistance welding. When the present invention is used, the gasket is first placed on the lower welding electrode, and then inserted into the gas meter shell, the gasket is exposed from the opening (air inlet or outlet) of the gas meter shell, and then the joint body is installed in the opening, and the upper welding electrode can be pressed down to perform resistance welding, and the gas meter shell, the joint body and the gasket are welded together. Compared with the traditional welding structure, the present invention can significantly increase the current density of the welding surface during the resistance welding process through the cooperation of the first convex ring and the second convex ring, saving power consumption. At the same time, the first convex ring and the second convex ring are both annular structures, and the materials around the entire circumference are welded together. Compared with the prior art, the probability of welding blind spots is significantly reduced, thereby improving the welding effect, ensuring the sealing, and reducing the scrap rate when welding the meter joint and the gasket of the gas meter casing.

[0007] Furthermore, the first convex ring and the second convex ring are circular rings with the same inner diameter; when the meter joint of the gas meter housing is welded, the first convex ring and the second convex ring face each other, thereby ensuring that there is no welding breakpoint in the whole circle and ensuring the overall welding of the whole circumference material.

[0008] Furthermore, the first convex ring is integrally formed with the joint body, and the second convex ring is integrally formed with the gasket. The integral forming mentioned here means that they are formed into an integral structure simultaneously during the manufacturing process, preferably by integral casting. In addition, any existing integral forming manufacturing process can be applied to this solution.

[0009] Furthermore, the cross-section of the first convex ring is in the shape of a right-angled trapezoid, with the top edge of the right-angled trapezoid facing the direction of the gasket, and the right-angled side of the right-angled trapezoid facing outward. The cross-section of the second convex ring is in the shape of a triangle, with one vertex of the triangle facing the direction of the first convex ring. The right-angled side facing outward means that the right-angled side is located on the radially outward side of the first convex ring. The top edge of the right-angled trapezoid described in this solution refers to the shorter side of the two parallel sides of the right-angled trapezoid. When the right-angled side of the right-angled trapezoid faces outward, its hypotenuse faces inward, which is conducive to matching with a right-angled side on the cross-section of the second convex ring when matching with the second convex ring, thereby improving the matching stability and reducing the risk of shaking and falling off during welding.

[0010] Furthermore, the top angle of the triangle facing the direction of the first convex ring is set to a rounded angle, which facilitates the smooth contact between the end face of the first convex ring and the end face of the second convex ring, is conducive to automatically adjusting the matching position under the action of gravity, reduces the risk of jamming, and can also reduce the mutual wear between the first convex ring and the second convex ring before welding, ensuring that the current of the welding surface is stable and uniform, so that the welding result is uniform and stable.

[0011] Furthermore, when the gasket is welded to the joint body, the intersection of the top edge and the hypotenuse of the right-angled trapezoid formed by the first convex ring is opposite to a vertex of the triangle formed by the second convex ring. Through the arrangement in this scheme, when pressure is applied to the gasket, the top edge of the first convex ring slides outward away from the vertex of the right-angled triangle, so that the first convex ring can tightly clamp the second convex ring inside to form two concentric rings. When welding is performed in this state, the positions of the entire circle of weld points are covered by the first convex ring, which can not only significantly improve the welding stability, but also assist in sealing through the first convex ring after welding is completed, further improving the sealing effect and reducing the scrap rate caused by poor sealing performance.

[0012] Furthermore, the first convex ring and the second convex ring have the same height in the axial direction of the joint body.

[0013] The resistance welding method of the table joint welding structure of the casing of the IoT smart gas meter includes:

[0014] Install the washer on the lower welding electrode;

[0015] Install the gas meter casing so that the opening of the gas meter casing faces the lower welding electrode;

[0016] Put the joint body into the opening of the gas meter housing so that the first convex ring on the joint body contacts the second convex ring on the gasket;

[0017] The upper welding electrode is aligned with the lower welding electrode and pressed downward to perform resistance welding, so as to weld the gas meter housing, the gasket and the joint body into a whole.

[0018] The method adds a gasket, and discharges between the upper welding electrode and the lower welding electrode under the condition that the first convex ring and the second convex ring are in contact and cooperation, thereby performing resistance welding. Compared with the traditional gas meter shell surface joint welding structure, the current density of the welding surface can be significantly increased during the resistance welding process, saving power consumption. At the same time, the first convex ring and the second convex ring are welded together around the entire circumference of the material, and the probability of welding blind spots is significantly reduced compared with the prior art, thereby improving the welding effect, ensuring the sealing, and reducing the scrap rate when welding the surface joint and the gasket of the gas meter shell. Therefore, compared with the prior art, the method has outstanding substantial characteristics and significant progress.

[0019] Furthermore, there are two lower welding electrodes, which are matched with the air inlet and the air outlet of the gas meter shell respectively. That is, washers are placed on both lower welding electrodes, and then after the gas meter shell is put on, the two washers are exposed from the air inlet and the air outlet of the gas meter shell respectively, and then the joint body is installed on the air inlet and the air outlet of the gas meter shell, and the two joint bodies are resistance welded respectively by the upper welding electrode.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. The table joint welding structure of the IoT smart gas meter housing and the resistance welding method thereof of the present invention can significantly increase the current density of the welding surface during resistance welding and save power consumption through the cooperation of the first convex ring and the second convex ring, compared with the traditional welding structure. At the same time, the first convex ring and the second convex ring are both annular structures, and the materials around the whole circumference are welded together. Compared with the prior art, the probability of welding blind spots is significantly reduced, thereby improving the welding effect, ensuring the sealing, and reducing the scrap rate when welding the table joint and the gasket of the gas meter housing.

[0022] 2. The table joint welding structure of the casing of the Internet of Things smart gas meter and the resistance welding method thereof of the present invention can improve the matching stability and reduce the risks of shaking and falling off during welding.

[0023] 3. The meter joint welding structure of the casing of the IoT smart gas meter of the present invention and the resistance welding method thereof, after welding, auxiliary sealing is performed by a first convex ring, so as to further improve the sealing effect and reduce the scrap rate caused by poor sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0025] Figure 1 It is a cross-sectional view of the joint body through the axis in a specific embodiment of the present invention;

[0026] Figure 2 A top view of a gasket in a specific embodiment of the present invention;

[0027] Figure 3 It is a cross-sectional view of the gasket through the axis in a specific embodiment of the present invention;

[0028] Figure 4 It is an assembly cross-sectional view of a specific embodiment of the present invention before welding;

[0029] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0030] Figure 6The figure is a schematic diagram of the operation flow of a specific embodiment of the present invention.

[0031] Marks and corresponding parts names in the attached drawings:

[0032] 1-joint body, 101-first convex ring, 2-washer, 201-second convex ring, 3-gas meter housing. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0034] Embodiment 1:

[0035] like Figures 1 to 4 The table joint welding structure of the IoT smart gas meter housing shown in the figure includes a joint body 1 and a gasket 2. A first convex ring 101 is provided at one end of the joint body 1 and the gasket 2 for welding, and a second convex ring 201 is provided on one side of the gasket 2; the first convex ring 101 and the second convex ring 201 match each other. During the resistance welding process, the first convex ring 101 and the second convex ring 201 are welded together around the entire circumference, so that the gas meter housing 3, the joint body 1 and the gasket 2 are welded into an integral structure.

[0036] In this embodiment, by adding the gasket 2 and the combined effect of the first convex ring 101 and the second convex ring 201, the current density of the welding surface during resistance welding is significantly increased, power consumption is saved, and since the materials of the first convex ring 101 and the second convex ring 201 are welded together around the entire circumference, welding blind spots are less likely to occur, thereby improving the welding effect and ensuring the sealing.

[0037] Embodiment 2:

[0038] like Figures 1 to 4 The table joint welding structure of the IoT smart gas meter housing shown in the figure is based on Example 1, and the first convex ring 101 and the second convex ring 201 are circular rings with equal inner diameters. After assembly, the first convex ring 101 and the second convex ring 201 are opposite to each other. When the table joint of the gas meter housing is welded, the first convex ring 101 and the second convex ring 201 are opposite to each other. This embodiment can ensure that there is no welding breakpoint in the whole circle, and ensure the overall fusion of the whole circumference of the material.

[0039] As a more preferred embodiment, the first convex ring 101 and the joint body 1 are integrally cast by a dedicated mold, and the second convex ring 201 and the gasket 2 are integrally cast by a dedicated mold.

[0040] In this embodiment, the heights of the first protruding ring 101 and the second protruding ring 201 in the axial direction of the joint body 1 are equal, both being 0.5 mm. The width of the first protruding ring 101 in the radial direction is 1 mm, and the width of the second protruding ring 201 in the radial direction is also 1 mm.

[0041] The resistance welding process based on the structure in this embodiment is as follows:

[0042] Install the two washers 2 on the two lower welding electrodes respectively; install the gas meter housing 3 so that the air inlet and the air outlet of the gas meter housing 3 are respectively opposite to the two lower welding electrodes, and the two washers are exposed from the air inlet and the air outlet of the gas meter housing 3 respectively; put the joint body 1 into the air inlet and the air outlet of the gas meter housing 3, so that the first convex ring 101 on the joint body 1 is opposite to the second convex ring 201 on the washer 2; then adjust the upper welding electrode to align it with a lower welding electrode and press down, under the pressure of the upper welding electrode, the first convex ring 101 contacts the second convex ring 201, discharges to perform resistance welding, and welds the gas meter housing 3 and the corresponding washer 2 and joint body 1 into a whole; then raise the upper welding electrode to align it with the other lower welding electrode, press down to weld the other joint body 1; after welding is completed, take out the welded gas meter housing.

[0043] Among them, although the specific gaskets used in the gas inlet and gas outlet of the gas meter housing 3 are different, in this embodiment, the method of resistance welding through the first convex ring on the joint body and the second convex ring on the gasket is the same. That is, although the gasket structures used in the gas inlet and gas outlet are different, the second convex ring matching the corresponding first convex ring is provided on them.

[0044] The resistance welding in this embodiment adopts medium-frequency inverter resistance welding technology. The welded gasket and the joint body are respectively provided with a circle of protruding ribs, namely the first convex ring 101 and the second convex ring 201, and have the same diameter. During welding, the current density of the welding surface is increased, which saves power consumption. At the same time, the materials around the whole circle are welded together, which significantly improves the sealing effect and reduces the scrap rate. According to the inventor's experiment, the present application is used for resistance welding of the meter joint and the gasket 2 of the gas meter housing. There are only 2 scrapped pieces out of 100 pieces, that is, the scrap rate can be reduced to 2%.

[0045] Embodiment 3:

[0046] A more preferred embodiment is as follows Figure 5As shown: Based on any of the above embodiments, the cross section of the first convex ring 101 is in the shape of a right-angled trapezoid, the top side of the right-angled trapezoid faces the direction of the gasket 2, and the right-angled side of the right-angled trapezoid faces outward. The cross section of the second convex ring 201 is in the shape of a right-angled triangle, and the right-angled end of the right-angled triangle faces the direction of the first convex ring 101. The right-angled end of the right-angled triangle is set as a rounded corner. When the gasket 2 is matched with the joint body 1, the intersection of the top side and the hypotenuse of the right-angled trapezoid formed by the first convex ring 101 is opposite to the vertex of the right-angled triangle formed by the second convex ring 201.

[0047] The top side of the right-angled trapezoid in this embodiment refers to the shorter side of the two parallel sides of the right-angled trapezoid, that is, Figure 5 The right-angled side of the right-angled trapezoid faces outward, and its hypotenuse faces inward, which is conducive to matching with a right-angled side on the cross section of the second convex ring when matching with the second convex ring, thereby improving matching stability and reducing the risk of shaking and falling off during welding.

[0048] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A meter joint welding structure of an IoT smart gas meter housing, comprising a joint body (1), characterized in that: It also comprises a washer (2) for welding to the joint body (1); a first convex ring (101) is arranged at one end of the joint body (1) and the washer (2) for welding; a second convex ring (201) is arranged at a side of the washer (2) close to the first convex ring (101); the first convex ring (101) and the second convex ring (201) match each other; The first convex ring (101) and the second convex ring (201) are circular rings with equal inner diameters; when the meter joint of the gas meter housing is welded, the first convex ring (101) and the second convex ring (201) face each other; The cross section of the first convex ring (101) is in the shape of a right-angled trapezoid, the top edge of the right-angled trapezoid faces the direction of the gasket (2), and the right-angled sides of the right-angled trapezoid face outwards; The cross section of the second convex ring (201) is in a triangular shape, with one vertex of the triangle facing the direction of the first convex ring (101).

2. The table joint welding structure of the housing of the Internet of Things smart gas meter according to claim 1 is characterized in that: The first convex ring (101) is integrally formed with the joint body (1), and the second convex ring (201) is integrally formed with the gasket (2).

3. The table joint welding structure of the housing of the Internet of Things smart gas meter according to claim 1 is characterized in that: The vertex angle of the triangle facing the direction of the first convex ring (101) is set as a rounded angle.

4. The table joint welding structure of the housing of the Internet of Things smart gas meter according to claim 1 is characterized in that: When the gasket (2) is welded to the joint body (1), the intersection of the top side and the hypotenuse of the right-angled trapezoid formed by the first convex ring (101) faces a vertex of the triangle formed by the second convex ring (201).

5. The table joint welding structure of the housing of the Internet of Things smart gas meter according to claim 1 is characterized in that: The first convex ring (101) and the second convex ring (201) have the same height in the axial direction of the joint body (1).

6. A resistance welding method for a table joint welding structure of an IoT smart gas meter housing according to any one of claims 1 to 5, characterized in that: include: Install the washer (2) on the lower welding electrode; Installing the gas meter housing (3) so that the opening of the gas meter housing (3) faces the lower welding electrode; Inserting a joint body (1) into the opening of the gas meter housing (3) so that a first convex ring (101) on the joint body (1) contacts a second convex ring (201) on the gasket (2); The upper welding electrode is aligned with the lower welding electrode and pressed downward to perform resistance welding, thereby welding the gas meter housing (3), the gasket (2) and the joint body (1) into a whole.

7. The resistance welding method for the table joint welding structure of the housing of the Internet of Things smart gas meter according to claim 6 is characterized in that: There are two lower welding electrodes, which respectively match the air inlet and the air outlet of the gas meter housing (3).

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