Frost valve body for outdoor pipeline and preparation method

Abstract

The invention discloses an anti-freezing valve body for an outdoor pipeline and a preparation method. The anti-freezing valve body comprises a valve body and a valve element. The valve core is in an unexcited state and comprises an inner branch pipe arranged in the valve body; a sealing cavity is formed on the outer wall of the inner branch pipe through a paraffin layer; the paraffin layer cavity is filled with a first foaming agent, so that the first foaming agent is in a to-be-used state; the valve element is in an excited state, the paraffin layer is heated to melt and release the first foaming agent for foaming, and the first foaming agent is condensed after temperature drops. According to the anti-freezing valve body for the outdoor pipeline, the foaming agent is evenly wrapped by the paraffin shell and distributed between the inner branch pipe and the valve body, the problem of uneven filling caused by fluidity of a traditional foaming material is effectively solved, it is ensured that the foaming agent can be accurately released at a preset position, a uniform and stable foaming layer is formed, and the anti-freezing effect is improved. Meanwhile, by means of the synergistic effect of the double foaming agents and the paraffin phase change heat storage function, accurate control over the foaming layer structure is achieved, and the heat preservation performance is remarkably improved.

Description

Technical Field

[0001] This application relates to the technical field of mechanical equipment, and particularly to an anti-freezing valve body for outdoor pipelines. Background Art

[0002] A valve is a pipeline accessory used to open and close pipelines, control the flow direction, and adjust and control parameters (temperature, pressure, and flow rate) of the transported medium; according to its functions, it can be divided into shut-off valves, check valves, regulating valves, etc. The medium (such as liquid) flows through the flow channel inside the valve. In an environment with a relatively low temperature, especially when the valve is closed, the residual liquid in the flow channel will be affected by the low temperature and turn into a solid state, with an increase in volume, that is, the freezing phenomenon occurs, which will exert a large extrusion force 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 pipeline for transporting the medium will be reduced.

[0003] In the prior art, to prevent the outdoor pipeline from freezing in winter, a method of filling the gap between the inner branch pipe 101 and the valve body with foaming material is usually adopted to improve the heat preservation performance. However, this method has significant limitations: the fluidity of the foaming material results in uneven filling. Especially in complex or narrow spaces, the local area may be too thin, affecting the heat preservation effect. Although vibration can improve the 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 foaming layer, which not only affects the consistency of the heat preservation effect but also may lead to waste of resources and increased costs. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems in the related art to some extent.

[0005] For this purpose, an object of this application is to provide an anti-freezing valve body for outdoor pipelines and a preparation method thereof. The foaming agent is evenly wrapped and distributed between the inner branch pipe and the valve body by a paraffin shell, effectively solving the problem of uneven filling caused by the fluidity of traditional foaming materials, ensuring that the foaming agent can be accurately released at a predetermined position, and forming a uniform and stable foaming layer.

[0006] To achieve the above object, an embodiment of the first aspect of this application provides an anti-freezing valve body for outdoor pipelines, 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 first foaming agent is contained in the paraffin layer cavity, making the first foaming agent in a state to be used; when the valve core is in an activated state, the paraffin layer is heated to melt and release the first foaming agent for foaming. As the temperature drops, the first foaming agent condenses, and the paraffin is dispersed inside the first foaming agent after foaming.

[0007] In an embodiment of the present application, a layer of iron powder is evenly applied on the outer circumferential surface of the paraffin layer filled with the first foaming agent. When the paraffin layer melts, under the attraction of the magnet penetrating from the inside of the inner branch pipe, the iron powder drives the melted paraffin to move, and the position of the melted paraffin is adjusted by the magnitude of the magnetic force, the attraction duration, and the position.

[0008] In an embodiment of the present application, a bag body is sleeved on the outer circumferential surface of the paraffin layer. A sealed cavity is arranged inside the bag body, and a second foaming agent is filled inside the sealed cavity.

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

[0010] In an embodiment of the present application, a preparation method of an anti-freezing valve body for outdoor pipelines includes the following steps: Step 1: Prepare a cylindrical mold matching the outer diameter of the inner branch pipe, and spray a mold release agent on the inner wall; Step 2: Heat the paraffin to 90 - 100 °C until it melts, then inject it into the mold, insert the inner branch pipe mandrel while reserving an injection port, and demold after cooling to form a hollow paraffin shell; Step 3: Then insert the inner branch pipe into the hollow paraffin shell, and then fill the connection part between the inner branch pipe and the paraffin shell with paraffin liquid. After the paraffin liquid solidifies, the interface can be sealed; Step 4: Finally, inject the first foaming agent into the paraffin shell through the injection port, and seal the injection port after filling.

[0011] In an embodiment of the present application, the surface of the inner branch pipe is sandblasted or chemically etched to increase the roughness to improve the adhesion.

[0012] In an embodiment of the present application, a preparation method of an anti-freezing valve body for outdoor pipelines includes the following steps: Step 5: Use external equipment to fix the valve body and the electromagnet, introduce the paraffin shell and the foaming agent into the valve body through the inner branch pipe, and stabilize the position of the inner branch pipe; Step 6: Then heat the valve body evenly. Since the first foaming agent is composed of a low-temperature foaming agent and a high-temperature foaming agent mixed 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; Step 7: During the foaming process, rotate the valve body, use the iron powder to adsorb and push the paraffin to move towards the center until the paraffin and the iron powder reach the middle of the first foaming agent; Step 8: Finally, raise the heating temperature of the valve body to 100 to 110 degrees, and the high-temperature foaming agent foams, fills the gaps in the skeleton and squeezes the paraffin to form a "skeleton + filling" composite structure.

[0013] In one embodiment of the present application, the magnetic force magnitude, attraction duration, and position of the electromagnet can all be adjusted, and the position of the electromagnet with respect to the iron powder can be controlled.

[0014] In one embodiment of the present application, a method for preparing an anti-freezing valve body for outdoor pipelines further includes the following steps: Step Nine: Slip a bag containing the second foaming agent over the surface of the paraffin shell, and let the bag enter the valve body along with the inner branch pipe. Step Ten: After the first foaming agent in the paraffin shell foams, increase the heating of the valve body to 130 degrees Celsius to cause the second foaming agent to foam inside the bag, strengthening the stability between the valve body and the inner branch pipe.

[0015] In one embodiment of the present application, the bag can be adjusted as needed to adapt to the usage requirements of different valve bodies.

[0016] For the anti-freezing valve body for outdoor pipelines according to the embodiments of the present application, the beneficial effects are as follows: The paraffin shell evenly wraps and distributes the foaming agent between the inner branch pipe and the valve body, effectively solving the problem of uneven filling caused by the 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 synergistic effect of the dual foaming agents and the paraffin phase change heat storage function, precise control of the foaming layer structure is achieved, and the heat preservation performance is significantly improved.

[0017] Some of the additional aspects and advantages of the present application will be given in the following description, some will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easier to understand from the following description of the embodiments in conjunction with the drawings, where: Figure 1 is a schematic structural diagram of an anti-freezing valve body for outdoor pipelines according to one embodiment of the present application; Figure 2 is a partial cross-sectional view of a valve core according to one embodiment of the present application.

[0019] As shown in the figure: 10, valve body; 101, inner branch pipe; 20, valve core; 201, paraffin layer; 202, first foaming agent; 203, bag; 204, second foaming agent. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, but should not be construed as limiting the present application.

[0021] The anti-freezing valve body for outdoor pipelines according to the embodiments of the present application will be described below with reference to the accompanying drawings. Embodiment 1:

[0022] As Figure 1 - Figure 2 shown, the anti-freezing valve body for outdoor pipelines according to the embodiments 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 sealing cavity is formed by the paraffin layer 201 on the outer wall of the inner branch pipe 101; the first foaming agent 202 is contained in the paraffin layer 201 cavity, making the first foaming agent 202 in a state ready for use. It should be noted that the first foaming agent 202 is a foaming agent mixed by 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 the paraffin, and it foams at 60 - 80 degrees. The foaming temperature of the high-temperature foaming agent is 100 - 130 degrees for foaming.

[0023] The recommended model of the low-temperature foaming agent is: azodicarbonamide (ADC, modified); ADC modified low-temperature foaming agent: Foaming temperature: 65 ± 5 °C (matched with the melting point of paraffin) Foaming ratio: 3 - 5 times (low expansion, ensuring the stability of the framework) Particle size: 50 - 100 μm (facilitating uniform dispersion).

[0024] The recommended model of the high-temperature foaming agent is: polyurethane prepolymer (HFC-245fa); HFC-245fa high-temperature foaming agent: Foaming temperature: 110 ± 10 °C Foaming ratio: 10 - 15 times (high expansion, fully filling) Gas release rate: slow and controllable (avoiding collapsing the framework).

[0025] When the valve core 20 is in an activated state, the paraffin layer 201 is heated and melted to release the first foaming agent 202 for foaming. As the temperature drops, the first foaming agent 202 condenses, and the paraffin is dispersed inside the first foaming agent 202 after foaming.

[0026] The foaming agent is evenly wrapped and distributed between the inner branch pipe 101 and the valve body by a paraffin shell, effectively solving the problem of uneven filling caused by the fluidity of traditional foaming materials. 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, with the synergistic effect of the double foaming agent and the paraffin phase change heat storage function, the structure of the foaming layer can be precisely controlled, and the heat preservation performance can be significantly improved. Embodiment 2:

[0027] In an embodiment of the present application, as Figure 2 shown, a layer of iron powder is evenly smeared on the outer cylindrical surface of the paraffin layer 201 filled with the first foaming agent 202. When the paraffin layer 201 melts, under the attraction of a magnet penetrating from the inside of the inner branch pipe 101, the iron powder drives the melted paraffin to move, and the position of the melted paraffin is adjusted by the magnetic force magnitude, attraction duration, and position.

[0028] 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 again in the target area to form a dense barrier layer. The thermal conductivity of the iron powder and paraffin composite layer is low, achieving double heat insulation and improving the heat insulation effect.

[0029] By setting iron powder on the outer surface of the paraffin shell to form a magnetic composite layer, when the paraffin melts, an electromagnet is used to cooperate with the iron powder to guide the molten paraffin to move to a designated area, avoiding paraffin residue blocking the flow channel, effectively improving the filling rate of the foaming agent, 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. Embodiment 3:

[0030] In an embodiment of the present application, as Figure 2 shown, a bag body 203 is sleeved on the outer cylindrical surface of the paraffin layer 201, and a sealed cavity is provided inside the bag body 203, and a second foaming agent 204 is filled inside the sealed cavity.

[0031] It should be noted that the foaming temperature of the second foaming agent 204 is about 130°C. Specifically, it is a foaming agent of OBSH (p-hydroxyphenylsulfonylhydrazide), and its decomposition temperature is approximately between 140 - 160°C, but when urea is used as a catalyst, it can start to foam at about 130°C.

[0032] In an embodiment of the present application, as Figure 1 shown, the bag body 203 is made of a high-temperature resistant material, so that the bag body 203 will not deform due to temperature changes during use.

[0033] It should be noted that the bag body 203 is a polyamide (PA) bag, which has good mechanical strength and temperature resistance, and can usually withstand temperatures as high as 150°C to 200°C.

[0034] In one embodiment of the present application, a method for preparing an anti-freezing valve body for outdoor pipelines includes the following steps: Step 1: Prepare a cylindrical mold matching the outer diameter of the inner branch pipe 101, and spray a release agent on the inner wall; Step 2: Heat paraffin to 90 - 100 °C until it melts, then inject it into the mold, insert the mandrel of the inner branch pipe 101 while reserving an injection port, and demold after cooling to form a hollow paraffin shell; Step 3: Then insert the inner branch pipe 101 into the hollow paraffin shell, and fill the connection between the inner branch pipe 101 and the paraffin shell with paraffin liquid. After the paraffin liquid solidifies, the interface can be sealed; Step 4: Finally, inject the first foaming agent 202 into the paraffin shell through the injection port, and seal the injection port after filling.

[0035] It should be noted that after implementing 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 tightness of the paraffin shell, so that during subsequent use, the paraffin and the foaming agent inside the paraffin can work properly.

[0036] In one embodiment of the present application, as Figure 2 shown, the surface of the inner branch pipe 101 is sandblasted or chemically etched (such as phosphoric acid treatment) to increase roughness and improve adhesion.

[0037] In one embodiment of the present application, a method for preparing an anti-freezing valve body for outdoor pipelines includes 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 stabilize the position of the inner branch pipe 101; Step 6: Then uniformly heat the valve body 10. Since the first foaming agent 202 is composed of a low-temperature foaming agent and a high-temperature foaming agent mixed 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; Step 7: During the foaming process, rotate the valve body 10, use the iron powder to adsorb and push the paraffin towards the center until the paraffin and the iron powder reach the middle of the first foaming agent 202; Step 8: Finally, raise the heating temperature of the valve body 10 to 100 to 110 degrees, and the high-temperature foaming agent foams, fills the gaps in the skeleton and extrudes the paraffin to form a "skeleton + filling" composite structure.

[0038] In one embodiment of the present application, the magnetic force magnitude, attraction duration, and position of the electromagnet can all be adjusted, and the position of the iron powder by the electromagnet can be controlled.

[0039] In one embodiment of the present application, a method for preparing an anti-freezing valve body for outdoor pipelines further includes the following steps: Step Nine: Put the bag body 203 filled with the second foaming agent 204 on the surface of the paraffin shell, and make the bag body 203 enter the valve body 10 along with the inner branch pipe 101; Step Ten: After the first foaming agent 202 in the paraffin shell foams, increase the heating of the valve body 10 to 130 degrees, so that the second foaming agent 204 foams in the bag body 203, strengthening the stability between the valve body 10 and the inner branch pipe 101.

[0040] The second foaming agent 204 in the bag body 203 can increase the sealing degree between the first foaming agent 202 and the valve body 10, strengthening the stability between the two. At the same time, after the foaming agent ages, the bag body 203 and the inner branch pipe 101 are directly drawn out, and then the aged foaming agent can be replaced, avoiding the existing foaming agent sticking to the inner wall of the valve body 10, which requires cleaning of the foaming agent during subsequent replacement, reducing the replacement difficulty and improving the operation convenience. Embodiment Four:

[0041] In one embodiment of the present application, as Figure 2 shown, the bag body 203 can be adjusted as needed to make the bag body 203 adapt to the usage requirements of different valve bodies 10.

[0042] It should be noted that the bag body 203 can also be used alone to meet different usage requirements and increase its adaptability during use.

[0043] In summary, for the anti-freezing valve body for outdoor pipelines in the embodiments of the present application, the paraffin shell is used to evenly wrap and distribute the foaming agent between the inner branch pipe 101 and the valve body, effectively solving the problem of uneven filling caused by the fluidity of traditional foaming materials. 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, with the synergistic effect of the double foaming agent and the paraffin phase change heat storage function, the precise control of the foaming layer structure is realized, and the heat preservation performance is significantly improved.

[0044] In the description of this specification, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this 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 contains 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) for foaming. The temperature drops, the first foaming agent (202) condenses, and the wax is dispersed inside the foamed first foaming agent (202).

2. The antifreeze valve body for outdoor pipes according to claim 1, characterized in that: 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 extending deep into the inner branch pipe (101). The position of the melted paraffin is adjusted by the magnitude of the magnetic force, the attraction duration and the position.

3. The antifreeze valve body for outdoor pipes according to claim 2, characterized in that: 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 filled in the sealed cavity.

4. The antifreeze valve body for outdoor pipes according to claim 3, characterized in that: The bag body (203) is made of a high temperature resistant material, so that the bag body (203) will not be deformed due to temperature changes during use.

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

6. A method for preparing an antifreeze valve body for outdoor pipes as claimed in claim 1, characterized in that: The method for preparing the valve core (20) comprises the following steps: Step 1: prefabricate a cylindrical mold that matches the outer diameter of the inner branch pipe (101), and spray a mold 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) mandrel 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, it can form a seal 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.

7. The method for preparing an antifreeze valve body for an outdoor pipeline according to claim 6, characterized in that: The outer surface of the inner branch pipe (101) is sandblasted or chemically etched to increase the roughness so as to improve the adhesion.

8. The method for preparing an antifreeze valve body for an outdoor pipeline according to claim 6, characterized in that: The following steps are also included: Step 5: Use an external device 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 stabilize the position of the inner branch pipe (101); Step 6: The valve body (10) is then heated uniformly. 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, 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 wax toward the center until the paraffin wax 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, and the high-temperature foaming agent is foamed to fill the gaps in the frame and squeeze the paraffin to form a "frame + filling" composite structure.

9. The method for preparing an antifreeze valve body for an outdoor pipeline according to claim 8, characterized in that: The magnitude of the magnetic force, the duration of attraction and the position of the electromagnet can all be adjusted, and the electromagnet can be controlled to adjust the position of the iron powder.

10. The method for preparing an antifreeze valve body for an outdoor pipeline according to claim 8, characterized in that: The following steps are also included: Step nine: putting the bag body (203) containing the second foaming agent (204) on the surface of the paraffin shell, so that the bag body (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).

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