Thermal nodular cast iron pipe connector heat preservation structure
By wrapping a flexible insulation layer and a limiting strip around the joint of the ductile iron pipe, combined with a limiting groove and a protective sleeve, the insulation and waterproof sealing problems of the joint of the ductile iron pipe for heating are solved, achieving efficient insulation and structural stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG GUOMING DUCTILE IRON PIPES TECH CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-08
AI Technical Summary
The existing ductile iron pipe joints for heating have insufficient thermal insulation and waterproof sealing performance, leading to heat loss and pipe corrosion problems.
A flexible insulation layer is wound around the reserved gap between the plug and socket interfaces, and a second winding layer is used to cover the connection. Combined with the design of the limiting groove and limiting band, the outer protective sleeve tightly wraps the structure, forming a stable insulation structure.
It effectively reduces heat loss, improves waterproof sealing performance, ensures the structure remains stable when pipes expand or contract or are subjected to external forces, and prevents moisture from corroding insulation materials and pipes.
Smart Images
Figure CN224214972U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat insulation technology for ductile iron pipe joints, specifically to a heat insulation structure for ductile iron pipe joints used in heating systems. Background Technology
[0002] In the field of heat transmission, ductile iron pipes are widely used in heat pipeline systems due to their high strength and corrosion resistance. However, pipe joints have always been a weak link in the heat transmission process. Due to poor insulation performance and insufficient structural stability at the joints, heat loss is very likely to occur, which not only reduces energy utilization efficiency but may also cause pipe corrosion and shorten the service life of the pipes.
[0003] Traditional ductile iron pipe joint insulation structures often use only a single insulation material to fill the joint, which fails to effectively prevent heat transfer through the joint gap, resulting in poor insulation performance. Furthermore, the waterproofing and sealing of the joint are not adequately considered, allowing moisture to easily seep into the joint, corroding the insulation material and the pipe, further reducing insulation performance and pipe safety.
[0004] In summary, there is a need for a thermal insulation structure for ductile iron pipe joints that can improve thermal insulation performance and waterproof sealing performance. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide a thermal insulation structure for the interface of ductile iron pipe for heating. By wrapping and filling the reserved gap between the spigot and socket interfaces with a flexible insulation layer, and using a second wrapping layer to cover the connection, the heat loss at the interface is effectively reduced. The spigot interface limiting groove and the socket interface limiting groove are set, and the limiting band is embedded in them. With the tight wrapping of the outer protective sleeve, the entire joint insulation structure can remain stable when the pipeline expands or contracts or is subjected to external force.
[0006] A thermal insulation structure for ductile iron pipe interfaces includes a plug pipe and a receiving pipe. One end of the plug pipe is provided with a plug interface, and one end of the receiving pipe is provided with a receiving interface. The plug interface is inserted into the receiving interface.
[0007] It also includes a flexible insulation layer, which is wrapped and filled in the reserved gap between the insertion interface and the receiving interface, and the outermost layer of the flexible insulation layer is at the same height as the outer wall of the receiving interface;
[0008] The second winding layer is wrapped and pasted on the outside of the flexible insulation layer, covering the connection between the flexible insulation layer and the socket and insertion interface.
[0009] The outer sides of the insertion tube and the receiving tube are respectively covered with protective sleeves, one end of the insertion interface can be covered by the corresponding protective sleeve, and one end of the receiving interface can be covered by the corresponding protective sleeve.
[0010] Furthermore, the arc-shaped outer wall of the insertion pipe is provided with an annular insertion interface limiting groove at one end of the insertion interface, and the arc-shaped outer wall of the receiving pipe is provided with an annular receiving interface limiting groove at one end of the receiving interface.
[0011] Furthermore, it also includes a limiting band, with each of the protective sleeves respectively wrapped with the limiting band, the limiting band being embedded in the corresponding insertion interface limiting groove and receiving interface limiting groove, and the two ends of each limiting band being fixedly connected.
[0012] Furthermore, it also includes an outer protective sleeve, which is fitted onto the limiting band and can wrap around both of the limiting bands.
[0013] Furthermore, a first winding layer is wound around the outer side of each of the limiting bands, and the first winding layer is placed between the outer protective sleeve and the limiting band.
[0014] Furthermore, the outer protective sleeve is a heat shrink sleeve, and a round hole is provided at the position corresponding to the reserved hole of the protective sleeve. The outer protective sleeve is used to tightly wrap the first winding layer and the overlap of the two protective sleeves.
[0015] Furthermore, the protective sleeve is a foldable rubber sleeve.
[0016] Furthermore, the limiting band is a stainless steel band, and both ends of the limiting band are tightened by a manual packer.
[0017] Furthermore, the first wrapping layer uses single-sided waterproof tape, and the second wrapping layer uses double-sided waterproof tape, with a total of ≥2 wrapping layers.
[0018] Compared with the prior art, the advantages and positive effects of this utility model are:
[0019] (1) By wrapping and filling the gap between the plug and the socket with a flexible insulation layer, and by using a second wrapping layer to cover the connection, the heat loss at the interface is effectively reduced.
[0020] (2) Set the insertion interface limiting groove and the receiving interface limiting groove, and embed the limiting band in them, and tightly wrap the outer protective sleeve so that the entire joint insulation structure can remain stable when the pipeline expands or contracts or is subjected to external force.
[0021] (3) The protective sleeve is made of foldable rubber sleeve, which is convenient for installation; the limit strap is made of stainless steel and is tightened by a manual packer, making the installation process simple and efficient; at the same time, the structural design of each component makes it easier to maintain and replace some components later.
[0022] (4) The first and second winding layers effectively prevent moisture from entering the interface, avoiding the problem of reduced performance of insulation materials and pipeline corrosion caused by moisture. Attached Figure Description
[0023] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:
[0024] Figure 1 This is a three-dimensional exploded cross-sectional view of the present invention;
[0025] Figure 2 For the present utility model Figure 1 A magnified view of a section at point A in the middle;
[0026] Figure 3 This is the front view of the present invention.
[0027] In the figure: 1. Outer protective sleeve; 101. Round hole; 2. Protective sleeve; 3. First winding layer; 4. Limiting band; 5. Insertion interface limiting groove; 6. Insertion pipe; 601. Insertion interface; 7. Flexible insulation layer; 8. Receiving pipe; 801. Receiving interface; 9. Second winding layer; 10. Receiving interface limiting groove. Detailed Implementation
[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0029] A thermal insulation structure for a ductile iron pipe interface for heating includes a plug pipe 6 and a receiving pipe 8. One end of the plug pipe 6 is provided with a plug interface 601, and one end of the receiving pipe 8 is provided with a receiving interface 801. The plug interface 601 is inserted into the receiving interface 801.
[0030] It also includes a flexible insulation layer 7, which is wrapped and filled in the reserved gap between the insertion interface 601 and the receiving interface 801, and the outermost layer of the flexible insulation layer 7 is at the same height as the outer wall of the receiving interface 801.
[0031] The second winding layer 9 is wrapped and pasted on the outside of the flexible insulation layer 7, covering the connection between the flexible insulation layer 7 and the receiving interface 801 and the insertion interface 601.
[0032] The insertion tube 6 and the receiving tube 8 are respectively covered with protective sleeves 2. One end of the insertion interface 601 can be covered by the corresponding protective sleeve 2, and one end of the receiving interface 801 can be covered by the corresponding protective sleeve 2.
[0033] The flexible insulation layer 7 is filled in the gap between the insertion interface 601 and the receiving interface 801, and its good thermal insulation performance prevents heat from being transferred through the interface gap.
[0034] The second winding layer 9 further seals the joint, reducing the path of heat loss from the joint and thus achieving efficient heat preservation.
[0035] The arc-shaped outer wall of the insertion pipe 6 is provided with an annular insertion interface limiting groove 5 at one end of the insertion interface 601, and the arc-shaped outer wall of the receiving pipe 8 is provided with an annular receiving interface limiting groove 10 at one end of the receiving interface 801.
[0036] It also includes a limiting band 4, which is wrapped around each of the protective sleeves 2. The limiting band 4 is embedded in the corresponding insertion interface limiting groove 5 and receiving interface limiting groove 10, and the two ends of each limiting band 4 are fixedly connected.
[0037] The insertion interface limiting groove 5 and the receiving interface limiting groove 10 on the insertion pipe 6 and the receiving pipe 8 cooperate with the limiting band 4 wrapped around the protective sleeve 2. The limiting band 4 is embedded in the limiting groove, which restricts the relative displacement of the protective sleeve 2, the insertion pipe 6, and the receiving pipe 8 at the interface. When the pipeline expands or contracts due to temperature changes or external forces, the limiting band 4 can evenly distribute the force and ensure the stability of the entire structure.
[0038] It also includes an outer protective sleeve 1, which is fitted onto the limiting band 4 and can wrap around both of the limiting bands 4.
[0039] Each of the limiting bands 4 has a first winding layer 3 wrapped around its outer side, and the first winding layer 3 is placed between the outer protective sleeve 1 and the limiting band 4.
[0040] The outer protective sleeve 1 is a heat shrink sleeve, and a round hole 101 is provided at the position corresponding to the reserved hole of the protective sleeve 2. The outer protective sleeve 1 is used to tightly wrap the first winding layer 3 and the overlap of the two protective sleeves 2.
[0041] The outer protective sleeve 1 tightly wraps around the overlap of the limiting band 4 and the protective sleeve 2, enhancing the overall structure and resistance to external forces.
[0042] The protective sleeve 2 is a foldable rubber sleeve.
[0043] The limiting band 4 is a stainless steel band, and both ends of the limiting band 4 are tightened by a manual packer.
[0044] The first wrapping layer 3 uses single-sided waterproof tape, and the second wrapping layer 9 uses double-sided waterproof tape, with a total of ≥2 wrapping layers.
[0045] The first wrapping layer 3, made of single-sided waterproof tape, and the second wrapping layer 9, made of double-sided waterproof tape, form an effective waterproof barrier on the outer layer of the structure due to their waterproof properties. Moisture cannot penetrate into the joint, protecting the flexible insulation layer 7 and the pipes from moisture corrosion.
[0046] The method of using this utility model is as follows:
[0047] First, peel off the protective film of the insertion interface 601 of the insertion tube 6 and the protective film of the receiving interface 801 of the receiving tube 8. After putting on the protective sleeve 2, fold one end of the corresponding insertion interface 601 and receiving interface 801 so that the folded end is aligned with the insulation layer. Insert the insertion interface 601 of the insertion tube 6 into the receiving interface 801 of the receiving tube 8, leaving a proper interface gap.
[0048] A flexible insulation layer 7 is wrapped and filled within the reserved gap at the interface to ensure tight filling, and the outermost layer of the flexible insulation layer 7 is at the same height as the outer wall of the interface 801.
[0049] A second wrapping layer 9 is wrapped and pasted on the outside of the flexible insulation layer 7 to completely cover the connection between the flexible insulation layer 7 and the receiving interface 801 and the insert interface 601.
[0050] Reset the folded part of the protective sleeve 2, wrap the limiting band 4 around each protective sleeve 2, and embed it into the corresponding insertion interface limiting groove 5 and receiving interface limiting groove 10. Then use a manual packer to fix the two ends of the limiting band 4.
[0051] A first wrapping layer 3 is wrapped around the outside of each limiting band 4 so that the first wrapping layer 3 can cover the overlap of the two protective sleeves 2;
[0052] The outer protective sleeve 1 in the form of heat shrink sleeve is placed on the limiting band 4, covering the two limiting bands 4. The outer protective sleeve 1 is tightened by heating so as to tightly wrap the overlap of the first winding layer 3 and the two protective sleeves 2. Soap water is sprayed in the groove during the tightening process, and a round hole 101 is opened at the position corresponding to the reserved hole of the protective sleeve 2.
[0053] After processing, an airtightness test is conducted. During the test, nitrogen or air is introduced through the round hole 101 at a pressure of 0.02 MPa and the pressure is stabilized for 2 minutes. During this period, soapy water is sprayed on both ends of the heat shrink sleeve and the connection part of the protective sleeve 2 to check the airtightness and ensure that the airtightness is qualified.
[0054] After airtightness testing, the structure demonstrated good and stable airtightness.
[0055] The above-disclosed embodiments are merely specific examples of this utility model. However, this utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.
Claims
1. A thermal insulation structure for ductile iron pipe joints for heating, comprising a insertion pipe (6) and a receiving pipe (8), characterized in that: The insertion pipe (6) is provided with an insertion interface (601) at one end, and the receiving pipe (8) is provided with a receiving interface (801) at one end. The insertion interface (601) is inserted into the receiving interface (801). It also includes a flexible insulation layer (7), which is wrapped and filled in the reserved gap between the insertion interface (601) and the receiving interface (801), and the outermost layer of the flexible insulation layer (7) is at the same height as the outer wall of the receiving interface (801); The second winding layer (9) is wrapped and pasted on the outside of the flexible insulation layer (7) to cover the connection between the flexible insulation layer (7) and the receiving interface (801) and the insertion interface (601); The insertion tube (6) and the receiving tube (8) are respectively covered with protective sleeves (2). One end of the insertion interface (601) can be covered by the corresponding protective sleeve (2), and one end of the receiving interface (801) can be covered by the corresponding protective sleeve (2).
2. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 1, characterized in that: The outer arc of the insertion tube (6) is provided with an annular insertion interface limiting groove (5) at one end of the insertion interface (601), and the outer arc of the receiving tube (8) is provided with an annular receiving interface limiting groove (10) at one end of the receiving interface (801).
3. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 2, characterized in that: It also includes a limiting band (4), and each of the protective sleeves (2) is respectively wrapped with the limiting band (4). The limiting band (4) is embedded in the corresponding insertion interface limiting groove (5) and receiving interface limiting groove (10). The two ends of each limiting band (4) are fixedly connected.
4. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 3, characterized in that: It also includes an outer protective sleeve (1), which is fitted onto the limiting band (4) and can wrap around the two limiting bands (4).
5. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 4, characterized in that: Each of the limiting bands (4) is wrapped with a first winding layer (3) on its outer side, and the first winding layer (3) is placed between the outer protective sleeve (1) and the limiting band (4).
6. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 5, characterized in that: The outer protective sleeve (1) is a heat shrink sleeve, and a round hole (101) is provided at the position corresponding to the reserved hole of the protective sleeve (2). The outer protective sleeve (1) is used to tightly wrap the first winding layer (3) and the overlap of the two protective sleeves (2).
7. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 6, characterized in that: The protective sleeve (2) is a foldable rubber sleeve.
8. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 7, characterized in that: The limiting band (4) is a stainless steel band, and both ends of the limiting band (4) are tightened by a manual packer.
9. The thermal insulation structure for the interface of a ductile iron pipe for heating according to claim 8, characterized in that: The first wrapping layer (3) uses single-sided waterproof tape, and the second wrapping layer (9) uses double-sided waterproof tape, with a total number of wrapping and pasting layers ≥ 2.