A processing method for insulating stainless steel corrugated pipe

Abstract

The invention discloses a method for processing an insulated stainless steel corrugated pipe, including a method for processing an insulated stainless steel corrugated pipe, comprising a pipe body and a connecting nut, wherein a plurality of wave peaks are arranged on the pipe body, and troughs are formed between the two wave peaks; an inner insulating layer is arranged in the pipe body, and water holes penetrating to both ends are arranged in the inner insulating layer, and fixed flanges are arranged at the ends of the pipe body, and mounting slots are formed at the same time, and insulating fixed bosses are arranged at the ends of the inner insulating layer, which abut against the fixed flanges; the length of the pipe body matches the length of the inner insulating layer, and the length of the inner insulating layer is greater than 17 times the cross-sectional area of ​​the water hole; the invention also includes a method for processing an insulated stainless steel corrugated pipe; the invention can make the stainless steel corrugated pipe have insulation, and can effectively avoid the risk of electric shock when used in an electric water heater, thereby improving the safety of use.

Description

Technical Field

[0001] The invention relates to the technical field of stainless steel corrugated hoses, and in particular to a processing method of an insulating stainless steel corrugated hose. Background Art

[0002] With the improvement of living standards, various electric water heaters are widely used in life. The water heaters have water inlets and outlets, which are connected with pipes. The connecting pipes on the market now mainly include braided hoses, stainless steel corrugated hoses and PPR pipes. Compared with other braided hoses and stainless steel corrugated hoses, PPR pipes are not easy to bend and connect, and they must be connected by hot melt, so they are less used. Compared with stainless steel corrugated hoses, braided hoses are not easy to deform and their service life is not as long as that of stainless steel corrugated hoses. Stainless steel corrugated hoses are flexible, resistant to high temperatures, and easy to deform and shape, so they are more popular and the most used in the market.

[0003] With the popular use of electric water heaters, electric shock accidents that accompany them in life have also occurred more frequently, and the existing stainless steel corrugated hoses on the market do not have an insulating function; as a result, when there is a leakage in the electric water heater in life, leakage will be formed on the stainless steel corrugated hoses connected to the inlet and outlet through the water path, so that there is a risk of electric shock during the use of the stainless steel corrugated hose, and the safety of use is not high. Summary of the invention

[0004] In order to solve the above defects, the present invention provides a processing method for an insulating stainless steel bellows, which can make the stainless steel bellows insulating and can effectively avoid the risk of electric shock when used in an electric water heater, thereby improving the safety of use.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a processing method of an insulated stainless steel corrugated pipe, including a pipe body and a connecting nut, the pipe body is provided with a plurality of peaks, and troughs are formed between the two peaks; an inner insulating layer is provided in the pipe body, and water holes penetrating to both ends are provided in the inner insulating layer, and fixed flanges are provided at the ends of the pipe body and mounting slots are formed at the same time, and insulating fixed bosses are provided at the ends of the inner insulating layer to abut against the fixed flanges; the length of the pipe body matches the length of the inner insulating layer, and the length of the inner insulating layer is greater than 17 times the cross-sectional area of ​​the water hole.

[0006] Furthermore, the inner insulating layer is provided with positioning peaks and positioning peak grooves corresponding to and matching the wave crests and wave troughs.

[0007] Furthermore, an insulating sleeve is matched and installed on the installation slot, a mounting groove is provided on the insulating sleeve, and the connecting nut is installed on the mounting groove.

[0008] Furthermore, an insulating accommodating groove is provided at the end of the insulating sleeve, and the fixing flange and the insulating fixing boss are correspondingly located in the insulating accommodating groove.

[0009] Preferably, the length of the inner insulation layer is 17 times the cross-sectional area of ​​the water hole.

[0010] Preferably, the inner insulating layer is made of high temperature resistant insulating silicone material.

[0011] The processing method of the insulating stainless steel bellows includes two parts: mold design and processing flow;

[0012] First, mold design includes the following steps:

[0013] Mould design and development; Mould production: the mould comprises an upper mould, a lower mould and a positioning rod. The upper mould and the lower mould are respectively provided with corresponding threaded pipe placement grooves. The length of the threaded pipe placement grooves is designed according to the length of the stainless steel corrugated pipe to be processed. The threaded pipe placement grooves are respectively provided with rod grooves and insulating boss grooves. The rod grooves, insulating boss grooves and threaded pipe placement grooves are coaxially arranged. Glue injection grooves are arranged between the two insulating boss grooves. Glue injection holes communicating with the glue injection grooves are arranged on the upper mould or the lower mould. Mould production is completed.

[0014] The processing flow includes the following steps:

[0015] Step S1, placing: inserting the positioning rod into the tube body of the stainless steel bellows, and then placing the stainless steel bellows together with the positioning rod into the threaded tube placement groove of the lower die, the stainless steel bellows is in the threaded tube placement groove, the fixed flanges at both ends of the stainless steel bellows are in the insulating boss groove, the circumferential outer wall thereof is sealed against the inner wall of the insulating boss groove, the positioning rod is positioned by the rod grooves at both ends of the threaded tube placement groove, and the two ends thereof are sealed against the inner wall of the rod groove;

[0016] Step S2, closing the mold: the upper and lower molds are closed by mechanical transmission;

[0017] Step S3, mixing the rubber materials: fully stirring and mixing the rubber materials according to the required proportions;

[0018] Step S4, injecting glue: injecting glue through the glue injection hole and the glue injection groove; the glue enters into the insulating boss groove and between the tube body of the stainless steel corrugated tube and the positioning rod;

[0019] Step S5, curing and molding: forming an inner insulating layer between the tube body of the stainless steel corrugated tube and the positioning rod, and forming an insulating fixing boss integral with the insulating boss groove, wherein the insulating fixing boss abuts against the fixing flange;

[0020] Step S6, performing a vulcanization treatment;

[0021] Step S7, performing mold separation: the upper mold and the lower mold are separated by mechanical transmission;

[0022] Step S8, cutting and separating: the inner insulation layers of two adjacent stainless steel corrugated pipes are injected with glue through the same glue injection groove, and are cut and separated from the connection formed by the glue injection groove;

[0023] Step S9, separating the positioning rod: pulling the positioning rod out of the inner insulating layer;

[0024] Step S10, trimming: the cutting burrs formed in step S8 are connected to the insulating fixing boss of the inner insulating layer and trimmed;

[0025] Step S11, inner insulation layer processing is completed;

[0026] Step S12, assembling parts: installing an insulating sleeve on the end of the stainless steel bellows, and installing a connecting nut on the insulating sleeve;

[0027] Step S13, the processing of the insulated stainless steel bellows is completed.

[0028] Step S9 in the processing flow may be performed before step S8.

[0029] In the mold design, a positioning protrusion for positioning the positioning rod is arranged on the lower mold.

[0030] The present invention has the following beneficial effects:

[0031] The stainless steel corrugated pipe processed by the processing method of the present invention has good insulation properties, effectively avoids the risk of electric shock when using the water heater in life, and improves the safety of use.

[0032] The pipe body of the present invention is provided with an inner insulating layer with insulating properties, and an insulating stainless steel bellows is used at the water inlet and outlet at the same time. The resistance of water itself is utilized (the national standard is that the resistivity of water at 15°C is greater than 1300Ω.cm), and the resistance per unit length of the water hole of the inner insulating layer is: 1300Ω.cm / water hole cross-sectional area, the safe resistance of water is at least 22000Ω, and the required safe length of the inner insulating layer is: 22000Ω / (1300Ω.cm / water hole cross-sectional area), so the length of the inner insulating layer needs to be at least 17 times the cross-sectional area of ​​the water hole, and the water flow passing through can be made to reach zero voltage or an extremely weak current below 0.02mA / Kw by measuring the safe length of the inner insulating layer and the aperture of the water hole, so that when the electric water heater has leakage or the ground wire is energized, the water inlet and outlet and the connected stainless steel bellows do not have dangerous current for electric shock, and there is no danger of electric shock at the parts below the insulating stainless steel bellows, thereby ensuring personal safety.

[0033] The present invention provides an insulating sleeve at the connecting nut of the pipe body to avoid water leakage at the connecting parts causing the risk of over-electricity; the inner insulating layer is made of silicone material with good bendability and does not affect the deformation and shaping of the stainless steel bellows during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the insulated stainless steel bellows in the present invention;

[0035] Figure 2 yes Figure 1 A magnified view of part A;

[0036] Figure 3 It is an exploded view of the mold of the present invention;

[0037] Figure 4 yes Figure 3 A magnified view of part B;

[0038] Figure 5 It is a planar structural diagram of the upper mold of the present invention;

[0039] Figure 6 yes Figure 5 Enlarged view of part C;

[0040] Figure 7 It is a schematic diagram of the upper and lower molds after the mold is closed in the present invention;

[0041] Figure 8 yes Figure 7 A magnified view of the D portion;

[0042] Fig. 9 It is a schematic diagram after curing and molding in the present invention;

[0043] Fig.10 yes Fig. 9 Enlarged view of part E. DETAILED DESCRIPTION

[0044] The present invention will be further described in conjunction with the accompanying drawings.

[0045] See also Figure 1 , Figure 2The present invention provides a processing method for an insulated stainless steel corrugated pipe, comprising a pipe body 1 and a connecting nut 1-1. The pipe body 1 is provided with a plurality of wave crests 2, and a trough 3 is formed between the two wave crests 2. The pipe body 1 is greater than or equal to 15 cm, and an inner insulating layer 4 is provided in the pipe body 1. The inner insulating layer 4 is provided with water holes 5 penetrating to both ends, and the diameter of the water holes 5 is greater than or equal to 10 mm. The length of the inner insulating layer 4 matches the length of the pipe body 1. By using the resistance of water itself (the national standard is that the resistivity of water at 15°C is greater than 1300Ω.cm), the safe resistance of water is at least 22000Ω. The safety length of the inner insulating layer 4 and the diameter of the water holes 5 are measured. The length of the inner insulating layer needs to be at least 17 times the cross-sectional area of ​​the water holes, so that the water flowing through reaches zero voltage or an extremely small voltage below 0.02mA / Kw. Weak current; the end of the tube body 1 is provided with a fixed flange 6 and a mounting slot 7 is formed at the same time, and the end of the inner insulating layer 4 is provided with an insulating fixed boss 8 that abuts against the fixed flange 6; the inner insulating layer 4 and the insulating fixed boss 8 at the end make the tube body 1 completely insulated from the electric water heater and the inlet and outlet water in the pipeline, effectively avoiding the risk of electric shock; the inner insulating layer 4 is respectively provided with a positioning peak 9 and a positioning peak groove 10 corresponding to the wave crest 2 and the wave trough 3, and the inner insulating layer 4 is integrally injection-molded in the tube body 1 through a shaping mold, which improves the stability of the attached connection between the inner insulating layer 4 and the tube body 1 while ensuring insulation; the length of the tube body 1 matches the length of the inner insulating layer 4, and the length of the inner insulating layer 4 is greater than 17 times the cross-sectional area of ​​the water hole. When the length of the inner insulating layer 4 is 17 times the cross-sectional area of ​​the water hole 5, it is the preferred length.

[0046] The mounting slot 7 is matched with an insulating sleeve 12, the insulating sleeve 12 is provided with a mounting slot 13, and the connecting nut 1-1 is installed on the mounting slot 13, which effectively avoids the danger of over-electrical leakage caused by water leakage at the connecting parts.

[0047] An insulating accommodating groove 14 is provided at the end of the insulating sleeve 12, and the fixing flange 6 and the insulating fixing boss 8 are correspondingly located in the insulating accommodating groove to further ensure the insulation of the connection.

[0048] The inner insulating layer 4 is made of high temperature resistant insulating silicone material.

[0049] The processing method of the insulating stainless steel bellows includes two parts: mold design and processing flow;

[0050] See also Figures 3 to 6 , first of all, mold design includes the following steps:

[0051] Mould design and development; Mould production: the mould comprises an upper mould 15, a lower mould 16 and a positioning rod 17. The upper and lower moulds are respectively provided with corresponding threaded pipe placement grooves 18. The length of the threaded pipe placement grooves 18 is designed according to the length of the stainless steel corrugated pipe to be processed. The threaded pipe placement grooves 18 are respectively provided with rod grooves 19 and insulating boss grooves 20. The rod grooves 19, insulating boss grooves 20 and threaded pipe placement grooves 18 are coaxially arranged. Glue injection grooves 21 are arranged between the insulating boss grooves 20 in pairs. Glue injection holes 22 communicating with the glue injection grooves 21 are arranged on the upper mould 15 or the lower mould 16. Mould production is completed.

[0052] See also Figures 7 to 10 , the processing flow includes the following steps:

[0053] Step S1, placement: insert the positioning rod 17 into the tube body 1 of the stainless steel bellows, and then place the stainless steel bellows together with the positioning rod into the threaded tube placement groove 18 of the lower die, the stainless steel bellows is in the threaded tube placement groove 18, the fixed flanges 6 at both ends of the stainless steel bellows are in the insulating boss groove 20, and the circumferential outer wall thereof is sealed against the inner wall of the insulating boss groove 20, the positioning rod 17 is positioned by the rod grooves 19 at both ends of the threaded tube placement groove 18, and the two ends thereof are sealed against the inner wall of the rod groove 19;

[0054] Step S2, closing the mold: the upper and lower molds are closed by mechanical transmission;

[0055] Step S3, mixing the rubber materials: fully stirring and mixing the rubber materials according to the required proportions;

[0056] Step S4, injecting glue: injecting glue through the glue injection hole 22 and the glue injection groove 21; the glue enters into the insulating boss groove 20 and between the tube body 1 of the stainless steel corrugated tube and the positioning rod 17;

[0057] Step S5, curing and molding: forming an inner insulating layer 4 between the tube body 1 of the stainless steel corrugated tube and the positioning rod 17, and forming an insulating fixed boss 8 integral with the insulating boss groove 20, the insulating fixed boss 8 abutting against the fixed flange 6;

[0058] Step S6, performing a vulcanization treatment;

[0059] Step S7, performing mold separation: the upper mold and the lower mold are separated by mechanical transmission;

[0060] Step S8, cutting and separating: the inner insulation layers of two adjacent stainless steel corrugated pipes are injected with glue through the same glue injection groove, and are cut and separated from the connection formed by the glue injection groove;

[0061] Step S9, separating the positioning rod: pulling the positioning rod 17 out of the inner insulating layer 4;

[0062] Step S10, trimming: the cutting burrs formed in step S8 are connected to the insulating fixing boss of the inner insulating layer and trimmed;

[0063] Step S11, inner insulation layer processing is completed;

[0064] Step S12, assembling parts: installing an insulating sleeve on the end of the stainless steel bellows, and installing a connecting nut on the insulating sleeve;

[0065] Step S13, the processing of the insulated stainless steel bellows is completed.

[0066] Step S9 in the processing flow may be performed before step S8.

[0067] In the mold design, a positioning protrusion 25 for positioning the positioning rod is arranged on the lower mold.

[0068] The above is a detailed introduction to the processing method of an insulated stainless steel corrugated pipe provided by an embodiment of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions disclosed by the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation of the present invention.

Claims

1. A processing method for an insulated stainless steel corrugated pipe, comprising a pipe body and a connecting nut, wherein the pipe body is provided with a plurality of wave crests, and wave troughs are formed between the two wave crests; an inner insulating layer is provided in the pipe body, and water holes penetrating to both ends are provided in the inner insulating layer, and a fixed flange is provided at the end of the pipe body, and a mounting slot is formed at the same time, and an insulating fixed boss is provided at the end of the inner insulating layer, which abuts against the fixed flange; the length of the pipe body matches the length of the inner insulating layer, and the length of the inner insulating layer is greater than 17 times the cross-sectional area of ​​the water-passing hole; the inner insulating layer is respectively provided with positioning peaks and positioning peak grooves corresponding to the wave crests and wave troughs; an insulating sleeve is matched and installed on the mounting slot, and a mounting slot is provided on the insulating sleeve, and the connecting nut is installed on the mounting slot; an insulating accommodating groove is provided at the end of the insulating sleeve, and the fixed flange and the insulating fixed boss are correspondingly located in the insulating accommodating groove; the length of the inner insulating layer is 17 times the cross-sectional area of ​​the water-passing hole, and the inner insulating layer is made of high-temperature resistant insulating silicone material; characterized in that: The processing method of the insulating stainless steel corrugated pipe includes two parts: mold design and processing flow; First, mold design includes the following steps: Mould design and development; Mould production: the mould includes an upper mould, a lower mould and a positioning rod. The upper mould and the lower mould are respectively provided with corresponding threaded pipe placement grooves. The length of the threaded pipe placement grooves is designed according to the length of the stainless steel corrugated pipe to be processed. The threaded pipe placement grooves are respectively provided with rod grooves and insulating boss grooves. The rod grooves, insulating boss grooves and threaded pipe placement grooves are coaxially arranged. Glue injection grooves are arranged between the two insulating boss grooves. Glue injection holes communicating with the glue injection grooves are arranged on the upper mould or the lower mould. Mould production is completed; The processing flow includes the following steps: Step S1, placing: inserting the positioning rod into the tube body of the stainless steel bellows, and then placing the stainless steel bellows together with the positioning rod into the threaded tube placement groove of the lower die, the stainless steel bellows is in the threaded tube placement groove, the fixed flanges at both ends of the stainless steel bellows are in the insulating boss groove, the circumferential outer wall thereof is sealed against the inner wall of the insulating boss groove, the positioning rod is positioned by the rod grooves at both ends of the threaded tube placement groove, and the two ends thereof are sealed against the inner wall of the rod groove; Step S2, closing the mold: the upper and lower molds are closed by mechanical transmission; Step S3, mixing the rubber materials: fully stirring and mixing the rubber materials according to the required proportions; Step S4, injecting glue: injecting glue through the glue injection hole and the glue injection groove; the glue enters into the insulating boss groove and between the tube body of the stainless steel corrugated tube and the positioning rod; Step S5, curing and molding: forming an inner insulating layer between the tube body of the stainless steel corrugated tube and the positioning rod, and forming an insulating fixing boss integral with the insulating boss groove, wherein the insulating fixing boss abuts against the fixing flange; Step S6, performing a vulcanization treatment; Step S7, performing mold separation: the upper mold and the lower mold are separated by mechanical transmission; Step S8, cutting and separating: the inner insulation layers of two adjacent stainless steel corrugated pipes are injected with glue through the same glue injection groove, and are cut and separated from the connection formed by the glue injection groove; Step S9, separating the positioning rod: pulling the positioning rod out of the inner insulating layer; Step S10, trimming: the cutting burrs formed in step S8 are connected to the insulating fixing boss of the inner insulating layer and trimmed; Step S11, inner insulation layer processing is completed; Step S12, assembling parts: installing an insulating sleeve on the end of the stainless steel bellows, and installing a connecting nut on the insulating sleeve; Step S13, the processing of the insulated stainless steel bellows is completed.

2. The method for processing an insulating stainless steel corrugated pipe according to claim 1, characterized in that: Step S9 in the processing flow may be performed before step S8.

3. The method for processing an insulating stainless steel corrugated pipe according to claim 1, characterized in that: In the mold design, a positioning convex block for positioning the positioning rod is arranged on the lower mold.

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