Plastic hot melting adapter
By designing injection-molded pipes and annular groove structures made of plastic, the problems of water leakage and noise in copper-plastic conversion joints were solved, improving sealing performance and noise reduction while reducing material costs.
Patent Information
- Application Number
- CN202520249903.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-02-17
AI Technical Summary
Existing copper-plastic adapters suffer from material mismatch, resulting in significant differences in thermal expansion coefficients. This can lead to potential leaks after prolonged use and also increases costs.
The design employs two types of plastic injection tubes. By incorporating annular grooves and powder metallurgy silencers on the injection tubes, the thermal expansion coefficients are ensured to be similar, enhancing sealing performance and reducing noise through the silencers.
It effectively reduces the risk of water leakage from the heat fusion conversion joint, improves sealing performance, reduces noise, and lowers material costs.
Smart Images
Figure CN223635689U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hot melt conversion joint technical field especially relates to a plastic hot melt conversion joint. BACKGROUND
[0002] Different material plastics cannot be directly hot melt connected together because of incompatible material, and often need to pass through a conversion joint to hot melt connect two kinds of plastics together.
[0003] At present, the hot melt conversion joint on the market mostly adopts copper plastic conversion joint, copper inserts two ends, and different material plastics are injection molded respectively, and then hot melt conversion connection with different material plastics is carried out. This kind of joint has higher cost (the cost of copper part is much higher than that of plastic), and the thermal expansion coefficients of metal and plastic are quite different, and water leakage hidden danger is prone to appear after long time cold and hot alternating cycle. UTILITY MODEL CONTENTS
[0004] The utility model discloses in order to solve the copper plastic conversion joint of current easy water leakage's shortcoming, proposes a plastic hot melt conversion joint, and water leakage is not easy.
[0005] In order to achieve the above object, the utility model adopts the following technical scheme:
[0006] A plastic hot melt conversion joint, first injection pipe and second injection pipe of different plastic material are included, the first injection pipe is provided with the first annular groove on the outer periphery, the cross section of the first annular groove is trapezoidal, the slot width is greater than the slot bottom width, the inner periphery of the lower end of the first injection pipe is provided with the first cylindrical surface, the inner periphery of the upper end is provided with the second cylindrical surface with smaller radius, the upper end of the first cylindrical surface is connected to the lower end of the second cylindrical surface through the annular step, and the outer periphery of the annular step is provided with the second annular groove with downward slot; The second injection pipe includes the first injection part arranged on the lower side of the first injection pipe, the first injection part extends in layers on the upper end, forms the second injection part injection molded on the outer periphery of the first injection pipe, and the third injection part injection molded on the inner periphery of the lower end of the first injection pipe; The inner side of the second injection part fills the first annular groove, and the upper end of the second injection part extends to the annular step and fills the second annular groove.
[0007] Through the above setting, the first injection pipe and the second injection pipe are injection molded by two kinds of plastic material, compared with the traditional plastic steel conversion joint, the thermal expansion coefficient of the first injection pipe and the second injection pipe is more close, and the two are not easy to separate, and the sealing performance is more guaranteed;The first annular groove plays the role of axial and radial two-way anti-pulling, and the second annular groove prevents the third injection part from separating from the first cylindrical surface, so that the third injection part and the second injection part are closely attached to the inner and outer walls of the lower end of the first injection pipe, and the sealing performance is further improved.
[0008] Further, the inner wall of the first injection part, the inner wall of the third injection part and the first cylindrical surface are flush.
[0009] Through the above setting, the noise of the hot melt conversion joint is reduced.
[0010] Further, the first injection pipe upper end is internally embedded with a first annular powder metallurgy muffler, and the first injection part is internally embedded with a second annular powder metallurgy muffler.
[0011] Through the above setting, the noise of the hot melt conversion joint is further reduced.
[0012] Further, a plurality of notches are arranged at equal intervals along the outer periphery of the first injection pipe upper end, and the outer side of the first injection pipe upper end is in the shape of a nut.
[0013] Through the above setting, the material usage of the first injection pipe is reduced.
[0014] Further, the first annular groove is arranged in two, the upper first annular groove is arranged above the second annular groove, and the depth is greater than that of the lower first annular groove.
[0015] Through the above setting, the number of the first annular grooves is increased, and the sealing performance of the hot melt conversion joint is further improved.
[0016] Further, the distance between the upper side of the first annular powder metallurgy muffler and the first injection pipe upper end is w1, and 6mm > w1 > 4mm.
[0017] Further, the distance between the lower side of the second annular powder metallurgy muffler and the first injection part lower end is w2, and 6mm > w2 > 4mm. BRIEF DESCRIPTION OF DRAWINGS
[0018] Fig. 1 It is a schematic view of the hot melt conversion joint of the embodiment.
[0019] Fig. 2 It is a schematic view of the first injection pipe of the embodiment.
[0020] Fig. 3 It is a schematic view of the second injection pipe of the embodiment.
[0021] Fig. 4 It is a sectional view of the hot melt conversion joint of the embodiment. DETAILED DESCRIPTION
[0022] The technical scheme of the present application will be further specifically described below by means of embodiments and in combination with the drawings.
[0023] As Figs. 1 to 4As shown, a plastic hot melt adapter includes a first injection pipe 3 and a second injection pipe 4 made of different plastic materials, the first injection pipe 3 is provided with a first annular groove 5, the cross section of the first annular groove 5 is a trapezoid with a notch width greater than a groove bottom width, the inner periphery of the lower end of the first injection pipe 3 is provided with a first cylindrical surface 6, and the inner periphery of the upper end is provided with a second cylindrical surface 7 with a smaller radius than the first cylindrical surface 6, the upper end of the first cylindrical surface 6 transitions to the lower end of the second cylindrical surface 7 through an annular step, and the outer periphery of the annular step is provided with a second annular groove 8 with a downward notch; the second injection pipe 4 includes a first injection part 41 arranged on the lower side of the first injection pipe 3, the upper end of the first injection part 41 extends in layers to form a second injection part 42 injection molded on the outer periphery of the first injection pipe 3, and a third injection part 43 injection molded on the inner periphery of the lower end of the first injection pipe 3; the inner side of the second injection part 42 fills the first annular groove 5, and the upper end of the second injection part 42 extends to the annular step and fills the second annular groove 8.
[0024] Through the above arrangement, the first injection pipe 3 and the second injection pipe 4 are injection molded by two kinds of plastic materials, compared with the traditional plastic steel adapter, the thermal expansion coefficients of the first injection pipe 3 and the second injection pipe 4 are more close, and the two are not easy to separate, and the sealing performance is more reliable; the first annular groove 5 plays a role in axial and radial two-way anti-pulling, and the second annular groove 8 prevents the third injection part 43 from separating from the first cylindrical surface 6, so that the third injection part 43 and the second injection part 42 are tightly attached to the inner and outer walls of the lower end of the first injection pipe 3, further improving the sealing performance.
[0025] When producing the hot melt adapter, first, the first injection pipe 3 is injection molded, and then the second injection pipe 4 is injection molded at the lower end of the first injection pipe 3, the third injection part 43 at the upper end of the second injection pipe 4 and the second injection part 42 wrap the inner and outer sides of the lower end of the first injection pipe 3, ensuring sufficient contact area between the first injection pipe 3 and the second injection pipe 4, and improving the sealing performance;
[0026] The materials of the first injection pipe 3 and the second injection pipe 4 of the present application can use PPR, PE, PE-PT, PB, or other plastic materials, which are determined according to the material of the pipe to be connected, for example, one of the pipe materials is PE, and the other is PB, then the material of the first injection pipe 3 is selected as PE, and the material of the second injection pipe 4 is selected as PB; when the hot melt adapter is used, the end of the first injection pipe 3 is fused with the pipe material of PE, and the end of the second injection pipe 4 is fused with the pipe material of PB; when the hot melt adapter changes cold and hot, the first annular groove 5 prevents the second injection part 42 from separating from the lower end of the first injection pipe 3, the second annular groove 8 prevents the third injection part 43 from separating from the first cylindrical surface 6 at the lower end of the first injection pipe 3, prevents a gap between the first injection pipe 3 and the second injection pipe 4, and ensures the sealing performance.
[0027] As an implementation manner, the inner wall of the first injection molding part 41 and the inner wall of the third injection molding part 43 are flush with the first cylindrical surface 6.
[0028] Through the above setting, the noise of the hot melt conversion joint is reduced.
[0029] After the inner wall of the first injection molding part 41 and the inner wall of the third injection molding part 43 of the present application are flush with the first cylindrical surface 6, the inner wall of the hot melt conversion joint is a smooth cylindrical surface, and the noise is smaller when the internal water flows through the hot melt conversion joint.
[0030] As an implementation manner, a first annular powder metallurgy silencer 9 is pre-buried in the upper end of the first injection molding pipe 3, and a second annular powder metallurgy silencer 10 is pre-buried in the first injection molding part 41.
[0031] Through the above setting, the noise of the hot melt conversion joint is further reduced.
[0032] In the hot melt conversion joint of the present application, due to the existence of the second injection molding part 42 and the third injection molding part 43, the thickness of the middle part of the hot melt conversion joint is greater than the thickness of the upper and lower ends. The first annular powder metallurgy silencer 9 is arranged at the upper end of the hot melt conversion joint, and the second annular powder metallurgy silencer 10 is arranged at the lower end. The first annular powder metallurgy silencer 9 and the second annular powder metallurgy silencer 10 can absorb part of the sound wave, thereby reducing the noise.
[0033] As an implementation manner, a plurality of notches 11 are arranged at equal intervals along the outer periphery of the upper end of the first injection molding pipe 3, and the outer side of the upper end of the first injection molding pipe 3 is in the shape of a nut.
[0034] Through the above setting, the material usage of the first injection molding pipe 3 is reduced.
[0035] As an implementation manner, two first annular grooves 5 are arranged above and below, the upper first annular groove 5 is arranged above the second annular groove 8, and the depth is greater than that of the lower first annular groove 5.
[0036] Through the above setting, the number of first annular grooves 5 is increased, and the sealing performance of the hot melt conversion joint is further improved.
[0037] In the present application, the inner side of the lower first annular groove 5 exists the third injection molding part 43, therefore, the wall thickness of the lower end of the first injection molding pipe 3 is relatively thin, and the depth of the lower annular groove is small. The upper first annular groove 5 is close to the middle part of the first injection molding pipe 3, and the thickness of the middle part of the first injection molding pipe 3 is large, so that the depth of the upper first annular groove 5 can be large, and the pullout resistance is improved.
[0038] As an implementation manner, the distance between the upper side of the first annular powder metallurgy silencer 9 and the upper end of the first injection molding pipe 3 is w1, and 6mm > w1 > 4mm.
[0039] As an implementation, the distance between the lower side of the second annular powder metallurgy muffler 10 and the lower end of the first injection molding part 41 is w2, 6mm > w2 > 4mm.
[0040] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the utility model.
Claims
1. A plastic hot-melt transition joint, characterized in that, The first injection pipe and the second injection pipe are made of different plastic materials, the first injection pipe is provided with a first annular groove on the outer periphery, the cross section of the first annular groove is a trapezoid with a notch width greater than a groove bottom width, the inner periphery of the lower end of the first injection pipe is provided with a first cylindrical surface, and the inner periphery of the upper end is provided with a second cylindrical surface with a smaller radius than the first cylindrical surface, the upper end of the first cylindrical surface is connected to the lower end of the second cylindrical surface through an annular step, and the outer periphery of the annular step is provided with a second annular groove with a downward notch; the second injection pipe comprises a first injection part arranged below the first injection pipe, the upper end of the first injection part extends in layers to form a second injection part injection molded on the outer periphery of the first injection pipe and a third injection part injection molded on the inner periphery of the lower end of the first injection pipe; the inner side of the second injection part fills the first annular groove, and the upper end of the second injection part extends to the annular step and fills the second annular groove.
2. A plastic hot-melt transition joint according to claim 1, characterized in that The inner wall of the first injection part and the inner wall of the third injection part are flush with the first cylindrical surface.
3. A plastic hot-melt transition joint according to claim 1, characterized in that A first annular powder metallurgy silencer is embedded in the inner part of the upper end of the first injection pipe, and a second annular powder metallurgy silencer is embedded in the inner part of the first injection part.
4. A plastic hot-melt transition joint according to claim 1, characterized in that A plurality of notches are arranged at equal intervals along the outer periphery of the upper end of the first injection pipe, and the outer side of the upper end of the first injection pipe is in the shape of a nut.
5. A plastic hot-melt transition joint according to claim 1, characterized in that The first annular groove is arranged in two, the upper first annular groove is arranged above the second annular groove, and the depth of the upper first annular groove is greater than that of the lower first annular groove.
6. A plastic hot-melt transition joint according to claim 3, characterized in that The distance between the upper side of the first annular powder metallurgy silencer and the upper end of the first injection pipe is w1, and 6mm > w1 > 4mm.
7. A plastic hot-melt transition joint according to claim 3, characterized in that The distance between the lower side of the second annular powder metallurgy silencer and the lower end of the first injection part is w2, and 6mm > w2 > 4mm.