Antifreeze valve body for outdoor pipeline and preparation method thereof

Abstract

The present application discloses an antifreeze valve body for outdoor pipes and a preparation method thereof, comprising a valve body and a valve core; the valve core is in an unactivated state, and the valve core comprises an inner branch pipe arranged inside the valve body; a sealed cavity is formed on the outer wall of the inner branch pipe by a paraffin layer; a first foaming agent is contained in the paraffin layer cavity, so that the first foaming agent is in a ready-to-use state; the valve core is in an activated state, the paraffin layer is heated to melt, and the first foaming agent is released to foam, the temperature drops, and the first foaming agent condenses. The antifreeze valve body for outdoor pipes of the embodiment of the present application utilizes a paraffin shell to evenly wrap the foaming agent and distribute it between the inner branch pipe and the valve body, effectively solving the uneven filling problem of traditional foaming materials caused by fluidity. This method ensures that the foaming agent can be accurately released at a predetermined position and forms a uniform and stable foaming layer. At the same time, it also utilizes the synergistic effect of the double foaming agents and the phase change heat storage function of the paraffin wax to achieve precise control of the foaming layer structure and significantly improve the thermal insulation performance.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical equipment, and in particular to an antifreeze valve body for outdoor pipelines. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. The medium (such as liquid) flows through the flow channel in the valve. In a low temperature environment, especially when the valve is closed, the remaining liquid in the flow channel will be affected by the low temperature and become solid, and the volume will increase, that is, freezing will occur, thereby forming a greater squeezing effect on the valve. In severe cases, the valve may crack and leak; the service life of the valve will be reduced, and the stability of the overall conveying medium of the pipeline will be reduced.

[0003] In the prior art, in order to prevent outdoor pipes from freezing in winter, a method of filling the gap between the inner branch pipe 101 and the valve body with foam material is usually adopted to improve the thermal insulation performance. However, this method has significant limitations: the fluidity of the foam material leads to uneven filling, especially in complex or narrow spaces, where local areas may be too thin, affecting the thermal insulation effect. Although vibration can improve fluidity, this increases the construction difficulty and time cost, and it is difficult to ensure uniform filling in all areas. Even so, the lack of an effective control mechanism makes it difficult to accurately adjust the thickness and density of the foam layer, which not only affects the consistency of the thermal insulation effect, but may also lead to waste of resources and increased costs. Summary of the Invention

[0004] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, one purpose of the present application is to provide an antifreeze valve body and preparation method for outdoor pipes, which uses a paraffin shell to evenly wrap the foaming agent and distribute it between the inner branch pipe and the valve body, effectively solving the uneven filling problem caused by the fluidity of traditional foaming materials, ensuring that the foaming agent can be accurately released at the predetermined position and forming a uniform and stable foaming layer.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application proposes an antifreeze valve body for outdoor pipes, including a valve body and a valve core; the valve core includes an inner branch pipe, a paraffin layer and a first foaming agent; when the valve core is in an unactivated state, a sealed cavity is formed by the paraffin layer on the outer wall of the inner branch pipe; the paraffin layer cavity is filled with a first foaming agent, so that the first foaming agent is in a ready-to-use state; when the valve core is in an activated state, the paraffin layer is heated to melt and release the first foaming agent to foam, the temperature drops, the first foaming agent condenses, and the paraffin is dispersed inside the first foaming agent after foaming.

[0007] In one embodiment of the present application, a layer of iron powder is evenly coated on the outer cylindrical surface of the paraffin layer containing the first foaming agent. When the paraffin layer melts, the iron powder drives the melted paraffin to move under the attraction of a magnet penetrating deep into the inner branch pipe. The position of the melted paraffin is adjusted by the size of the magnetic force, the duration of attraction and the position.

[0008] In one embodiment of the present application, a bag body is provided on the outer circumferential surface of the paraffin layer, a sealed cavity is provided in the bag body, and a second foaming agent is contained in the sealed cavity.

[0009] In one embodiment of the present application, the bag body is made of high-temperature resistant material so that the bag body will not be deformed due to temperature changes during use.

[0010] In one embodiment of the present application, a method for preparing an antifreeze valve body for an outdoor pipeline includes the following steps:

[0011] Step 1: Prefabricate a cylindrical mold that matches the outer diameter of the inner branch pipe and spray a release agent on the inner wall;

[0012] Step 2: Heat the paraffin to 90-100°C and melt it before injecting it into the mold. Insert the inner branch mandrel while leaving an injection port. After cooling, demould the mold to form a hollow paraffin shell.

[0013] Step 3: Insert the inner branch tube into the hollow paraffin shell, and then fill the connection between the inner branch tube and the paraffin shell with paraffin liquid. After the paraffin liquid solidifies, it can form a seal on the interface;

[0014] Step 4: Finally, inject the first foaming agent into the paraffin shell through the injection port, and seal the injection port after it is filled.

[0015] In one embodiment of the present application, the surface of the inner branch pipe is sandblasted or chemically etched to increase the roughness to improve adhesion.

[0016] In one embodiment of the present application, a method for preparing an antifreeze valve body for an outdoor pipeline includes the following steps:

[0017] Step 5: Use external equipment to fix the valve body and electromagnet, introduce the paraffin shell and foaming agent into the valve body through the internal branch pipe, and firmly fix the position of the internal branch pipe;

[0018] Step 6: The valve body is then evenly heated. Since the first foaming agent is a mixture of a low-temperature foaming agent and a high-temperature foaming agent in a ratio of 35:65, when the temperature reaches 60 to 70 degrees, the paraffin shell melts and the low-temperature foaming agent foams synchronously to form a porous skeleton.

[0019] Step 7: During the foaming process, the valve body is rotated to use the iron powder to absorb and push the paraffin wax toward the center until the paraffin wax and the iron powder reach the middle of the first foaming agent;

[0020] Step 8: Finally, increase the heating temperature of the valve body to 100 to 110 degrees, and the high-temperature foaming agent will foam, fill the gaps in the skeleton and squeeze out the paraffin to form a "skeleton + filling" composite structure.

[0021] In one embodiment of the present application, the magnitude of the magnetic force, the duration of attraction and the position of the electromagnet can be adjusted, and the electromagnet can be controlled to adjust the position of the iron powder.

[0022] In one embodiment of the present application, a method for preparing an antifreeze valve body for an outdoor pipeline further includes the following steps:

[0023] Step 9: Put the bag containing the second foaming agent on the surface of the paraffin shell, and let the bag follow the inner branch pipe into the valve body;

[0024] Step 10: After the first foaming agent in the paraffin shell foams, heat the valve body to 130 degrees to allow the second foaming agent to foam in the bag body, thereby enhancing the stability between the valve body and the inner branch pipe.

[0025] In one embodiment of the present application, the bag body can be adjusted as needed to adapt to the use requirements of different valve bodies.

[0026] The antifreeze valve body for outdoor pipes according to the embodiment of the present application has the following beneficial effects:

[0027] The use of paraffin shells to evenly wrap the foaming agent and distribute it between the inner branch pipe and the valve body effectively solves the uneven filling problem caused by fluidity of traditional foaming materials. This method ensures that the foaming agent can be accurately released at the predetermined position and form a uniform and stable foaming layer. At the same time, with the help of the synergistic effect of the two foaming agents and the phase change heat storage function of paraffin, precise control of the foaming layer structure is achieved, and the thermal insulation performance is significantly improved.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1 This is a schematic structural diagram of an antifreeze valve body for an outdoor pipeline according to one embodiment of the present application;

[0031] Figure 2 It is a partial cross-sectional view of a valve core according to one embodiment of the present application.

[0032] As shown in the figure: 10, valve body; 101, inner branch pipe; 20, valve core; 201, paraffin layer; 202, first foaming agent; 203, bag body; 204, second foaming agent. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] The antifreeze valve body for outdoor pipes according to an embodiment of the present application is described below with reference to the accompanying drawings. Example 1:

[0035] like Figure 1-Figure 2 As shown, the antifreeze valve body for outdoor pipes according to the embodiment of the present application includes a valve body 10 and a valve core 20; the valve core 20 includes an inner branch pipe 101, a paraffin layer 201, and a first foaming agent 202; when the valve core 20 is in an unactivated state, a sealed cavity is formed on the outer wall of the inner branch pipe 101 by the paraffin layer 201; the first foaming agent 202 is contained in the cavity of the paraffin layer 201, so that the first foaming agent 202 is in a ready-to-use state;

[0036] It should be noted that the first foaming agent 202 is a foaming agent mixed with a low-temperature foaming agent and a high-temperature foaming agent. When the mixing ratio is 35:65 by weight, the comprehensive performance of the foaming layer is optimal. The foaming temperature of the low-temperature foaming agent is the same as the melting temperature of paraffin, and it foams at 60-80 degrees. The foaming temperature of the high-temperature foaming agent is 100-130 degrees.

[0037] The recommended low-temperature foaming agent is: azodicarbonamide (ADC, modified);

[0038] ADC modified low-temperature foaming agent:

[0039] Foaming temperature: 65±5℃ (matching the melting point of paraffin wax)

[0040] Foaming ratio: 3~5 times (low expansion to ensure skeleton stability)

[0041] Particle size: 50~100μm (easy to disperse evenly).

[0042] The recommended model of high-temperature foaming agent is: polyurethane prepolymer (HFC-245fa);

[0043] HFC-245fa high temperature foaming agent:

[0044] Foaming temperature: 110±10℃

[0045] Foaming ratio: 10~15 times (high expansion, full filling)

[0046] Gas release rate: Slow and controllable (to avoid collapsing the skeleton).

[0047] When the valve core 20 is in an excited state, the wax layer 201 is heated and melted to release the first foaming agent 202 for foaming. When the temperature drops, the first foaming agent 202 condenses, and the wax is dispersed inside the foamed first foaming agent 202.

[0048] The foaming agent is evenly wrapped with a paraffin shell and distributed between the inner branch pipe 101 and the valve body, which effectively solves the uneven filling problem of traditional foaming materials caused by fluidity. This method ensures that the foaming agent can be accurately released at the predetermined position and form a uniform and stable foaming layer. At the same time, with the help of the synergistic effect of the double foaming agents and the phase change heat storage function of paraffin, precise control of the foaming layer structure is achieved and the thermal insulation performance is significantly improved. Example 2:

[0049] In one embodiment of the present application, Figure 2 As shown, a layer of iron powder is evenly coated on the outer circumferential surface of the paraffin layer 201 containing the first foaming agent 202. When the paraffin layer 201 melts, the iron powder drives the melted paraffin to move under the attraction of the magnet deep inside the inner branch pipe 101. The position of the melted paraffin is adjusted by the size of the magnetic force, the duration of attraction and the position.

[0050] It should be noted that when the paraffin migrates to the target area, the magnetic field is cut off, and the paraffin cools and solidifies in the target area to form a dense barrier layer. The thermal conductivity of the composite layer of iron powder and paraffin is low, achieving double insulation and improving the insulation effect.

[0051] By setting iron powder on the outer surface of the paraffin shell to form a magnetic composite layer, when the paraffin melts, the electromagnet is used in conjunction with the iron powder to guide the molten paraffin to move to the designated area, avoiding paraffin residue blocking the flow channel, effectively improving the foaming agent filling rate, and at the same time rotating the valve body to avoid the influence of gravity on the iron powder, resulting in uneven distribution of the iron powder. Example 3:

[0052] In one embodiment of the present application, Figure 2 As shown, a bag body 203 is provided on the outer circumferential surface of the paraffin layer 201 , a sealed cavity is provided in the bag body 203 , and a second foaming agent 204 is filled in the sealed cavity.

[0053] It should be noted that the foaming temperature of the second foaming agent 204 is about 130°C. Specifically, the decomposition temperature of the OBSH (p-hydroxybenzenesulfonylhydrazine) foaming agent is about 140-160°C. However, when urea is used as a catalyst, foaming can begin at about 130°C.

[0054] In one embodiment of the present application, Figure 1 As shown, the bag body 203 is made of high temperature resistant material so that the bag body 203 will not be deformed due to temperature changes during use.

[0055] It should be noted that the bag body 203 is made of a polyamide (PA) bag, which has good mechanical strength and temperature resistance and can generally withstand temperatures as high as 150°C to 200°C.

[0056] In one embodiment of the present application, a method for preparing an antifreeze valve body for an outdoor pipeline includes the following steps:

[0057] Step 1: Prefabricate a cylindrical mold that matches the outer diameter of the inner branch pipe 101 and spray a release agent on the inner wall;

[0058] Step 2: Heat the paraffin to 90-100°C and melt it before injecting it into the mold. Insert the inner branch pipe 101 into the core shaft while leaving an injection port. After cooling, demould the mold to form a hollow paraffin shell.

[0059] Step 3: Insert the inner branch tube 101 into the hollow paraffin shell, and then fill the connection between the inner branch tube 101 and the paraffin shell with paraffin liquid. After the paraffin liquid solidifies, it can form a seal on the interface;

[0060] Step 4: Finally, inject the first foaming agent 202 into the paraffin shell through the injection port, and seal the injection port after it is filled.

[0061] It should be noted that after completing the above steps, the generation of the valve core 20 is completed. After generation, since the paraffin shell is relatively fragile, the valve core 20 needs to be protected by a protective shell after production to ensure the integrity and sealing of the paraffin shell, so that the paraffin and the foaming agent inside the paraffin can work normally during subsequent use.

[0062] In one embodiment of the present application, Figure 2 As shown, the surface of the inner branch pipe 101 is sandblasted or chemically etched (such as phosphoric acid treatment) to increase the roughness to improve adhesion.

[0063] In one embodiment of the present application, a method for preparing an antifreeze valve body for an outdoor pipeline includes the following steps:

[0064] Step 5: Use external equipment to fix the valve body 10 and the electromagnet, introduce the paraffin shell and the foaming agent into the valve body 10 through the inner branch pipe 101, and firmly fix the position of the inner branch pipe 101;

[0065] Step 6: The valve body 10 is then uniformly heated. Since the first foaming agent 202 is a mixture of a low-temperature foaming agent and a high-temperature foaming agent in a ratio of 35:65, when the temperature reaches 60 to 70 degrees Celsius, the paraffin shell melts and the low-temperature foaming agent foams simultaneously, forming a porous skeleton.

[0066] Step 7: During the foaming process, the valve body 10 is rotated to use the iron powder to absorb and push the paraffin toward the center until the paraffin and the iron powder reach the middle of the first foaming agent 202;

[0067] Step 8: Finally, the valve body 10 is heated to 100 to 110 degrees Celsius, and the high-temperature foaming agent is foamed to fill the gaps in the skeleton and squeeze out the paraffin to form a "skeleton + filling" composite structure.

[0068] In one embodiment of the present application, the magnitude of the magnetic force, the duration of attraction and the position of the electromagnet can be adjusted, and the electromagnet can be controlled to adjust the position of the iron powder.

[0069] In one embodiment of the present application, a method for preparing an antifreeze valve body for an outdoor pipeline further includes the following steps:

[0070] Step 9: Put the bag 203 filled with the second foaming agent 204 on the surface of the paraffin shell, so that the bag 203 follows the inner branch pipe 101 into the valve body 10;

[0071] Step 10: After the first foaming agent 202 in the paraffin shell is foamed, the valve body 10 is heated to 130 degrees to allow the second foaming agent 204 to foam in the bag body 203, thereby enhancing the stability between the valve body 10 and the inner branch pipe 101.

[0072] The second foaming agent 204 in the bag body 203 can increase the sealing between the first foaming agent 202 and the valve body 10, and enhance the stability between the two. At the same time, after the foaming agent ages, the bag body 203 together with the inner branch pipe 101 can be directly pulled out, and then the aged foaming agent can be replaced, avoiding the existing foaming agent from sticking to the inner wall of the valve body 10, resulting in the need to clean the foaming agent during subsequent replacement, reducing the difficulty of replacement and improving the convenience of operation. Example 4:

[0073] In one embodiment of the present application, Figure 2 As shown, the bag body 203 can be adjusted as needed to adapt to the use requirements of different valve bodies 10.

[0074] It should be noted that the bag body 203 can also be used alone to meet different usage needs and increase its adaptability during use.

[0075] In summary, the antifreeze valve body for outdoor pipes in the embodiment of the present application utilizes a paraffin shell to evenly wrap the foaming agent and distribute it between the inner branch pipe 101 and the valve body, effectively solving the uneven filling problem of traditional foaming materials caused by fluidity. This method ensures that the foaming agent can be accurately released at a predetermined position and form a uniform and stable foaming layer. At the same time, it also utilizes the synergistic effect of the double foaming agents and the phase change heat storage function of the paraffin wax to achieve precise control of the foaming layer structure and significantly improve the thermal insulation performance.

[0076] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" can explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0077] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. An antifreeze valve body for outdoor pipelines, characterized in that: It comprises a valve body (10) and a valve core (20); The valve core (20) comprises an inner branch pipe (101), a paraffin layer (201) and a first foaming agent (202); When the valve core (20) is in an unactivated state, a sealed cavity is formed on the outer wall of the inner branch pipe (101) by the paraffin layer (201); The paraffin layer (201) cavity is filled with a first foaming agent (202), so that the first foaming agent (202) is in a ready-to-use state; When the valve core (20) is in an excited state, the wax layer (201) is heated to melt and release the first foaming agent (202) to foam, the temperature drops, the first foaming agent (202) condenses, and the wax is dispersed inside the foamed first foaming agent (202); A layer of iron powder is evenly coated on the outer circumferential surface of the paraffin layer (201) containing the first foaming agent (202); when the paraffin layer (201) melts, the iron powder drives the melted paraffin to move under the attraction of the magnet deep inside the inner branch pipe (101), and the position of the melted paraffin is adjusted by the magnitude of the magnetic force, the duration of attraction, and the position; A bag body (203) is sleeved on the outer circumferential surface of the paraffin layer (201), a sealed cavity is provided in the bag body (203), and a second foaming agent (204) is contained in the sealed cavity.

2. The antifreeze valve body for outdoor pipes according to claim 1, characterized in that: The bag body (203) is made of high-temperature resistant material, so that the bag body (203) will not be deformed due to temperature changes during use.

3. The antifreeze valve body for outdoor pipes according to claim 1, characterized in that: The caliber of the bag body (203) can be adjusted as needed, so that the bag body (203) can adapt to the use requirements of different valve bodies (10).

4. A method for preparing an antifreeze valve body for outdoor pipes according to claim 1, characterized in that: The valve core (20) preparation method comprises the following steps: Step 1: prefabricate a cylindrical mold that matches the outer diameter of the inner branch pipe (101), and spray a release agent on the inner wall; Step 2: Heat the paraffin to 90-100°C and melt it, then inject it into the mold, insert the inner branch pipe (101) into the core shaft and reserve the injection port, and demould it after cooling to form a hollow paraffin shell; Step 3: Insert the inner branch tube (101) into the hollow paraffin shell, and then fill the connection between the inner branch tube (101) and the paraffin shell with paraffin liquid, and after the paraffin liquid solidifies, a seal can be formed on the interface; Step 4: Finally, the first foaming agent (202) is injected into the paraffin shell through the injection port, and the injection port is sealed after it is filled.

5. The method for preparing an antifreeze valve body for outdoor pipelines according to claim 4, characterized in that: The outer surface of the inner branch pipe (101) is sandblasted or chemically etched to increase the roughness and improve the adhesion.

6. The method for preparing an antifreeze valve body for an outdoor pipeline according to claim 4, further comprising the following steps: Step 5: Use external equipment to fix the valve body (10) and the electromagnet, introduce the paraffin shell and the foaming agent into the valve body (10) through the inner branch pipe (101), and firmly fix the position of the inner branch pipe (101); Step 6: The valve body (10) is then uniformly heated. Since the first foaming agent (202) is a mixture of a low-temperature foaming agent and a high-temperature foaming agent in a ratio of 35:65, when the temperature reaches 60 to 70 degrees Celsius, the paraffin shell melts and the low-temperature foaming agent foams synchronously to form a porous skeleton. Step 7: During the foaming process, the valve body (10) is rotated to use the iron powder to absorb and push the paraffin toward the center until the paraffin and the iron powder reach the middle of the first foaming agent (202); Step 8: Finally, the valve body (10) is heated to a temperature of 100 to 110 degrees Celsius, and the high-temperature foaming agent is foamed to fill the gaps in the frame and squeeze out the paraffin to form a "framework + filling" composite structure.

7. The method for preparing an antifreeze valve body for outdoor pipes according to claim 6, characterized in that: The magnitude of the magnetic force, the duration of attraction and the position of the electromagnet are all adjustable, and the electromagnet can be controlled to adjust the position of the iron powder.

8. The method for preparing an antifreeze valve body for an outdoor pipeline according to claim 6, further comprising the following steps: Step 9: Put the bag (203) filled with the second foaming agent (204) on the surface of the paraffin shell, so that the bag (203) follows the inner branch pipe (101) into the valve body (10); Step 10: After the first foaming agent (202) in the paraffin shell is foamed, the valve body (10) is heated to 130 degrees to allow the second foaming agent (204) to foam in the bag body (203), thereby enhancing the stability between the valve body (10) and the inner branch pipe (101).

Images