Oxygen conveying mechanism of wire and cable combustion test box

Abstract

The utility model relates to the technical field of material detection, in particular to an oxygen conveying mechanism of an electric wire and cable combustion test box, which comprises a vent hood arranged on a test box body, an air inlet pipe provided with a one-way valve is arranged on the vent hood, and the vent hood is provided with an obliquely downward opening on the inner side of the test box body. Under the action of positive pressure, oxygen-doped mixed gas smoothly enters the box body of the test box, in the combustion process of wires and cables, generated tiny particle dust can be blocked by the obliquely-arranged overturning plate, gas supply is stopped after oxygen reaches the supply standard, and under the action of elastic tension of the tension spring, the dustproof cover plates on the two sides seal the corresponding conveying cavities again, so that the gas supply is stopped. And meanwhile, the first magnetic block and the second magnetic block are attracted, under the joint protection of the overturning plate and the dustproof cover plate, particulate matter generated by combustion can be prevented from influencing oxygen supply, and the stability of oxygen supply is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of materials testing technology, and in particular to an oxygen delivery mechanism for a wire and cable combustion test chamber. Background Technology

[0002] To evaluate the flame retardancy and flame propagation characteristics of wire and cable products, i.e., their fire resistance under specific conditions, a combustion test is required. Specifically, wires and cables of appropriate length and diameter are selected, fixed in place, and subjected to surface combustion. Data such as flame propagation speed and self-extinguishing properties are then analyzed. In existing test chambers, air is supplied to the chamber via a fan during the combustion process.

[0003] For example, Chinese patent application number CN202321322721.5 discloses a cable horizontal combustion test device, including a U-shaped frame with a fan installed inside. The fan's input end is connected to an air inlet pipe, and its output end is connected to an air outlet pipe. This method ensures sufficient oxygen during combustion, preventing insufficient oxygen supply that could affect test results. However, during the combustion of electrical wires and cables, tiny dust particles are generated. Using a fan-based oxygen supply method, these particles often enter the air inlet and pipe opening of the oxygen supply fan with the airflow, affecting the stability of the oxygen supply. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose an oxygen delivery mechanism for a wire and cable combustion test chamber, so as to solve the technical problem that the existing oxygen supply method using a fan often results in particulate matter entering the air inlet and pipe opening of the oxygen supply fan with the airflow, affecting the stability of the oxygen supply.

[0005] To achieve the above objectives, this utility model provides an oxygen delivery mechanism for a wire and cable combustion test chamber, including a vent hood installed on the test chamber body, an air inlet pipe with a one-way valve installed on the vent hood, and a downward-sloping opening on the inner side of the vent hood. The oxygen delivery mechanism further includes:

[0006] A flip plate, which is movably mounted at the lower part of the opening;

[0007] The conveying chamber has at least two chambers, which are respectively installed on the side end of the vent hood, and the air inlet pipe is connected to the conveying chamber.

[0008] A dust cover is provided at the air supply port of the conveying chamber;

[0009] A pull assembly for opening and closing the air supply port of the delivery chamber.

[0010] Furthermore, the pulling component includes;

[0011] An extension section is provided on both sides of the conveying cavity, and an installation groove is provided on the extension section;

[0012] A tension spring, one end of which is connected to the mounting groove, and the other end of which is connected to the dust cover.

[0013] A guide rod is provided at the end of the extension section, and the dust cover is slidably disposed on the guide rod.

[0014] Furthermore, an L-shaped limiting block is installed on the side end of the opening, and the limiting block cooperates with the flip plate.

[0015] Furthermore, when the flip plate is in contact with the limiting block, the opening is in an open ventilation state.

[0016] Furthermore, the upper end of the flip plate is provided with a magnetic block one, and the upper part of the opening is provided with a magnetic block two that can be attracted to the magnetic block one.

[0017] Furthermore, when the first magnetic block and the second magnetic block are attracted to each other, the opening is in a closed and air-blocking state.

[0018] Furthermore, the side end of the vent is provided with a fixing ear, which is positioned between the opening and the air inlet pipe.

[0019] Furthermore, the inner air passage of the delivery chamber is L-shaped, and the delivery chamber is detachably installed inside the ventilation hood via a positioning plate.

[0020] The beneficial effects of this utility model are as follows: In the use of the oxygen delivery mechanism of the wire and cable combustion test chamber of this utility model, under positive pressure, the oxygen-mixed gas smoothly enters the test chamber. During the combustion of the wire and cable, the generated fine dust particles are blocked by the obliquely set flip plate. Once the oxygen supply standard is reached, the gas supply stops. Under the elastic tension of the tension spring, the dust covers on both sides close the corresponding delivery chambers again. At the same time, magnetic block one and magnetic block two are attracted together. Under the joint protection of the flip plate and the dust covers, the particulate matter generated during combustion can be prevented from affecting the oxygen supply, ensuring the stability of the oxygen supply. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the present invention in the state where oxygen supply is stopped;

[0023] Figure 2 This is a schematic diagram of the present invention in the state of oxygen delivery;

[0024] Figure 3 This is a schematic diagram of the internal structure of the ventilation hood in this utility model;

[0025] Figure 4 This is a schematic diagram of the assembly of the conveying cavity and the pulling component in this utility model;

[0026] Figure 5 This is a schematic diagram of the assembly of the dust cover and the tension spring in this utility model.

[0027] The diagram is marked as follows:

[0028] 1. Ventilation hood; 2. One-way valve; 3. Air inlet pipe; 4. Opening; 5. Tilting plate; 6. Conveying chamber; 7. Dustproof cover; 8. Mounting groove; 9. Tension spring; 10. Guide rod; 11. Limiting block; 12. Magnetic block one; 13. Magnetic block two; 14. Fixing ear; 15. Positioning plate. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] An embodiment of this utility model proposes an oxygen delivery mechanism for a wire and cable combustion test chamber, such as... Figure 1-5 As shown, the test chamber includes a vent hood 1 installed on the chamber body, an air inlet pipe 3 with a one-way valve 2 installed on the vent hood 1, and a downward-sloping opening 4 on the inner side of the vent hood 1. The oxygen delivery mechanism also includes:

[0032] Flip plate 5 is movably installed at the bottom of opening 4;

[0033] There are at least two delivery chambers 6, which are respectively installed on the side of the ventilation hood 1, and the air inlet pipe 3 is connected to the delivery chamber 6.

[0034] Dustproof cover 7 is located at the air supply port of the conveying chamber 6;

[0035] A pull assembly for opening and closing the air supply port of the delivery chamber 6.

[0036] In this embodiment, the pulling component includes;

[0037] Extension section, the extension section is located on both sides of the conveying cavity 6, and the extension section is provided with mounting groove 8;

[0038] Tension spring 9, one end of tension spring 9 is connected to the mounting groove 8, and the other end of tension spring 9 is connected to the dust cover plate 7;

[0039] Guide rod 10 is located at the end of the extension section, and dust cover 7 is slidably mounted on guide rod 10.

[0040] In this embodiment, an L-shaped limiting block 11 is installed on the side end of the opening 4, and the limiting block 11 cooperates with the flip plate 5.

[0041] In this embodiment, when the flip plate 5 is in contact with the limiting block 11, the opening 4 is in an open ventilation state.

[0042] In this embodiment, the upper end of the flip plate 5 is provided with a magnetic block 12, and the upper part of the opening 4 is provided with a magnetic block 2 13 that can be attracted to the magnetic block 12.

[0043] In this embodiment, when magnetic block 12 and magnetic block 2 13 are attracted to each other, the opening 4 is in a closed and air-blocking state.

[0044] Working process and principle: In this embodiment, oxygen is delivered into the ventilation hood 1 through the conveying chamber 6 on one side, and other gases are delivered into the ventilation hood 1 through the conveying chamber 6 on the other side. Under positive pressure, the gas sources in the two conveying chambers 6 will push the dust cover 7 to move along the guide rod 10 to detach from the gas delivery port of the conveying chamber 6 and then be delivered into the inner cavity of the ventilation hood 1. They are mixed in a certain proportion to achieve the required test conditions. The mixed oxygen-doped gas will continue to push and push the rotating plate 5, causing the magnetic block 12 and the magnetic block 2 13 to separate, so as to open the opening 4 and allow the oxygen-doped gas to smoothly enter the test chamber.

[0045] During the burning of the wires and cables, the tiny dust particles produced are blocked by the obliquely set flip plate 5. Once the oxygen supply standard is reached, the gas supply stops. Under the elastic tension of the tension spring 9, the dust cover plates 7 on both sides close the corresponding conveying chamber 6 again, and at the same time, the magnetic block 12 and the magnetic block 2 13 are attracted together.

[0046] In this embodiment, as Figure 1 , Figure 2 , Figure 3 As shown, the side end of the ventilation hood 1 is provided with a fixing ear 14, which is placed between the opening 4 and the air inlet pipe 3, making it convenient to replace and maintain the oxygen delivery mechanism.

[0047] In this embodiment, as Figure 4 As shown, the internal air passage of the delivery chamber 6 is L-shaped. The delivery chamber 6 can be detachably installed inside the ventilation hood 1 via the positioning plate 15, which facilitates cleaning and maintenance of the delivery chamber 6 inside the oxygen delivery mechanism.

[0048] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0049] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oxygen delivery mechanism for a wire and cable combustion test chamber, comprising a vent hood (1) installed on the chamber body, wherein the vent hood (1) is provided with an air inlet pipe (3) on which a one-way valve (2) is installed, characterized in that, The ventilation hood (1) has a downward-sloping opening (4) on the inside of the test chamber. The oxygen delivery mechanism also includes: A flip plate (5) is movably installed at the lower part of the opening (4); The conveying chamber (6) has at least two parts, and the conveying chambers (6) are respectively installed on the side end of the ventilation hood (1). The air inlet pipe (3) is connected to the conveying chamber (6). Dustproof cover (7), the dustproof cover (7) is provided at the air supply port of the conveying chamber (6); A pull assembly for opening and closing the air supply port of the delivery chamber (6).

2. The oxygen delivery mechanism of the wire and cable combustion test chamber according to claim 1, characterized in that, The pulling component includes; An extension section is provided on both sides of the conveying cavity (6), and an installation groove (8) is provided on the extension section; A tension spring (9), one end of which is connected to the mounting groove (8), and the other end of which is connected to the dust cover (7); A guide rod (10) is provided at the end of the extension section, and the dust cover (7) is slidably provided on the guide rod (10).

3. The oxygen delivery mechanism of the wire and cable combustion test chamber according to claim 1, characterized in that, An L-shaped limiting block (11) is installed on the side end of the opening (4), and the limiting block (11) cooperates with the flip plate (5).

4. The oxygen delivery mechanism of the wire and cable combustion test chamber according to claim 3, characterized in that, When the flip plate (5) is in contact with the limiting block (11), the opening (4) is in an open ventilation state.

5. The oxygen delivery mechanism of the wire and cable combustion test chamber according to claim 1, characterized in that, The upper end of the flip plate (5) is provided with a magnetic block one (12), and the upper part of the opening (4) is provided with a magnetic block two (13) that can be attracted to the magnetic block one (12).

6. The oxygen delivery mechanism of the wire and cable combustion test chamber according to claim 5, characterized in that, When the first magnetic block (12) and the second magnetic block (13) are attracted to each other, the opening (4) is in a closed and air-blocking state.

7. The oxygen delivery mechanism of the wire and cable combustion test chamber according to claim 1, characterized in that, The ventilation hood (1) has a fixing ear (14) on its side end, which is located between the opening (4) and the air inlet pipe (3).

8. The oxygen delivery mechanism of the wire and cable combustion test chamber according to claim 1, characterized in that, The inner air passage of the delivery chamber (6) is L-shaped, and the delivery chamber (6) can be detachably installed inside the ventilation hood (1) via the positioning plate (15).

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