Device for detecting moisture permeability of mattress

Abstract

The utility model discloses a mattress moisture permeability detection device which comprises a moisture permeability detection device, a humidity control device and an evaporation box. The moisture permeability detection device comprises a built-in water storage box, a constant-temperature heating rod, a moisture permeability box, a lifting connecting rod and a hexagon nut; the humidity control device comprises a water tank, an inner container, an atomizing sheet, a switch and a humidity sensor; the evaporation box comprises an electronic balance, a partition plate, a fan and a temperature sensor. The device can be used for detecting the moisture permeability of mattress samples with different thicknesses, can be used for thermal comfort related experimental research for evaluating the moisture permeability of mattresses, and also provides a test method for early-stage design and research and development of mattress products.

Description

Technical Field

[0001] The utility model patent relates to the technical field of mattress testing, and in particular to a mattress moisture permeability testing device. Background Art

[0002] The temperature and humidity of the human-bed interface are important indicators that affect sleep comfort. The key indicator of a mattress related to temperature and humidity is the air and moisture permeability of the mattress material. To evaluate a high-quality mattress, it must have good moisture permeability.

[0003] The evaluation methods of moisture permeability can be divided into subjective evaluation and objective evaluation. Subjective evaluation is mainly based on user perception, which has large individual differences and is difficult to quantify, so it cannot be used as a standard test method. The moisture permeability wVT is defined as the mass of water vapor that passes vertically through a unit area of ​​a sample within a specified time under the specified temperature and humidity conditions on both sides of the sample, in grams per square meter per hour or grams per square meter per 24 hours.

[0004] At present, the research on mattress moisture permeability testing is mainly aimed at the surface fabric of the mattress. Since the mattress material has certain thickness requirements, the existing textile moisture permeability testing equipment cannot meet the requirements of the moisture permeability performance test of the mattress sample. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the problem to be solved by the utility model is to propose a device for detecting the moisture permeability of a mattress, which can effectively detect the entire mattress and intuitively and objectively evaluate the moisture permeability of the mattress. The technical solution is as follows:

[0006] A device for detecting the moisture permeability of a mattress comprises a moisture permeability detection device, a humidity control device and an evaporation box. The moisture permeability detection device comprises a built-in water storage box, a constant temperature heating rod, a moisture permeability box, a lifting connecting rod, and a hexagonal nut; the top of the built-in water storage box is provided with an edge platform extending outwards all around, and four threaded through holes are provided on the corresponding edge platforms for use with the lifting connecting rods. By adjusting the position of the hexagonal nut, the built-in water storage box can be moved up and down along the lifting connecting rods in the moisture permeability box; the humidity control device comprises a water tank, an inner tank, an atomizing sheet, a switch, and a humidity sensor. The water tank is installed on the outside of the right side of the evaporation box, the inner tank is connected to the bottom plate of the water tank through a movable buckle, the switch is arranged on the outer side wall of the water tank, the atomizing sheet is fixed to the side wall of the inner tank, and the humidity sensor is fixed to the inner wall of the right side plate of the evaporation box; the left and right side plates of the evaporation box are respectively provided with square holes, and the fans are respectively installed in the square holes; the electronic balance is fixed to the bottom plate of the evaporation box, the partition is provided with an opening matching the size of the moisture permeability box, and the moisture permeability box is placed on the electronic balance through the opening to achieve the limit of the moisture permeability box; the temperature sensor is fixed on the top plate of the evaporation box.

[0007] Furthermore, in order to ensure the sealing of the test, the joints between the built-in water storage box and the moisture permeable box need to be sealed with a sealant. The sealant should have a high barrier effect on water and have no obvious weight gain or weight loss within the specified test period. Preferably, sealing wax or vinyl tape can be used to seal the joints.

[0008] Furthermore, referring to the water storage volume ratio of the evaporation method in Part 2 of the test method for moisture permeability of textile fabrics, the initial water storage capacity of the built-in water storage box is set to 3503 ml, and the volume ratio of the water storage box is 6 / 11. The distance between the water surface and the lower surface of the mattress sample is calculated to be 4.32 cm.

[0009] Furthermore, to simulate the evaporation mode of human sweat, the heating rod heats the water in the built-in water storage box at a constant temperature, and the water temperature set by the gear position of the heating rod is 34±2°C.

[0010] Furthermore, the experimental conditions were set to 23±2°C and the relative humidity was set to 50±2%.

[0011] Furthermore, the moisture permeability detection device includes a built-in water storage box, and the material of the moisture permeability box should have good properties, such as airtight, moisture-proof, and corrosion-resistant. There should be no obvious weight gain or weight loss within the specified test period, and the box can be made of aluminum alloy or organic glass.

[0012] Furthermore, the electronic balance has a measuring range of 5kg and an accuracy of 0.001g.

[0013] Furthermore, the built-in water storage box and the moisture permeability box are connected by a lifting connecting rod, and the lifting connecting rod is fine-tuned by rotating the hexagonal nuts on both sides according to the required displacement. The connecting rod is made of 304 stainless steel, with a thread diameter of 6mm and a total length of 400mm, which meets the requirements for the moisture permeability measurement of mattress samples with a thickness of less than 350mm.

[0014] Furthermore, a partition is installed inside the evaporation box, and an opening matching the size of the moisture permeable box is provided in the center of the partition. The moisture permeable box passes through the opening to limit the position of the moisture permeable box so that the mattress sample to be measured is fixed in the same position and remains fixed with the position of the fan.

[0015] The utility model has the following benefits:

[0016] By adjusting the distance between the built-in water storage box and the moisture permeability box, the moisture permeability of a mattress sample with a certain thickness can be tested. By combining the fabric layer with the cushioning layer and the support layer for testing, the moisture permeability test results are more accurate than the existing test that only tests the moisture permeability of the fabric layer on the surface of the mattress.

[0017] A constant temperature heating rod is installed in the built-in water storage box of the utility model, which not only improves the evaporation rate of the experiment, but also simulates the sweat volatilization mode of the human body during normal sleep, thereby ensuring the validity of the experimental detection data.

[0018] The utility model has the advantages of simple operation and strong repeatability, and has important guiding significance for the design and exploration of air-permeable and moisture-permeable mattresses by quantitatively describing the moisture permeability of the mattress and combining the thermal comfort of human sleep. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the utility model;

[0020] Figure 2 It is a side view of the utility model;

[0021] Figure 3 It is a structural diagram of the moisture permeability detection device in the utility model.

[0022] In the figure:

[0023] 1- moisture permeability device, 2- humidity control device, 3- evaporation box, 101- built-in water storage box, 102- moisture permeability box, 103- constant temperature heating rod, 104- lifting connecting rod, 105- hexagonal nut, 106- threaded through hole, 201- water tank, 202- liner, 203- atomizing sheet, 204- switch, 205- humidity sensor, 206- movable buckle, 301- electronic balance, 302- partition, 303- fan, 304- temperature sensor, 305- square hole. DETAILED DESCRIPTION

[0024] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the examples of the present invention.

[0025] Example 1

[0026] The built-in water storage box in this embodiment is welded from a 5mm thick organic glass plate, which is airtight, moisture-proof and transparent as a whole, making it easy to observe the state of the built-in water storage box. The overall size of the built-in water storage box can be set to 300mm*300mm*100mm. The mattress sample to be tested needs to be cut into a 300mm*300mm square size.

[0027] The moisture permeability box is welded by organic glass plates with a thickness of 5mm, and the joint between the moisture permeability box and the built-in water storage box is required to be as small as possible to ensure that it is airtight and moisture-tight after being sealed with a sealant. The overall size can be set to 305mm*305mm*400mm. Mattress samples with a thickness of less than 300mm can be tested.

[0028] The steps for using the mattress moisture permeability detection device in this embodiment are as follows:

[0029] (1) Refer to the test conditions in GB / T12704.2-2009 Test method for moisture permeability of textile fabrics Part 2: Evaporation method, set the ambient temperature to 23±2℃ and the relative humidity to 50±2℃. Ensure that the temperature and humidity are uniform everywhere.

[0030] (2) First, place the built-in water storage box on the electronic balance, weigh 3503 ml of distilled water, and heat the distilled water to a constant temperature of 34°C.

[0031] (3) Weigh and record the initial weight of the mattress sample.

[0032] (4) Then place the mattress sample on the edge platform of the built-in water storage box and nest it in the moisture permeability box. Adjust the hexagonal nut at the lower end of the lifting connecting rod according to the thickness of the mattress sample to be measured, so that the upper and lower surfaces of the mattress sample are tightly fitted with the edge platforms of the built-in water storage box and the moisture permeability box respectively.

[0033] (5) Use vinyl tape to seal the joints between the built-in water storage box and the moisture permeable box.

[0034] (6) After the test has lasted for 1 hour, weigh the mattress sample and the built-in water storage box respectively.

[0035] (7) Calculate the vertical moisture permeability of the mattress sample, s = 0.0676m 2 .

[0036] (8) Calculate the moisture permeability of the mattress according to formula (1): WVT = (a1-a2-Δb) / s / h (1)

[0037] a1: initial weight of water storage box / g; a2: final weight of water storage box / g; Δb: weight change of mattress sample / g; S: moisture permeable surface area / m 2 ;h: time / h

[0038] The above-mentioned specific implementation mode is only a preferred embodiment of the utility model and is not intended to limit the implementation and scope of the claims of the utility model. All equivalent changes and modifications made according to the content of the patent protection scope of the utility model application should be included in the scope of the utility model patent application.

Claims

1. A mattress moisture permeability testing device, characterized in that: The invention comprises a moisture permeability detection device (1), a humidity control device (2), and an evaporation box (3); the moisture permeability detection device (1) comprises a built-in water storage box (101), a moisture permeability box (102), a constant temperature heating rod (103), a lifting connecting rod (104), and a hexagonal nut (105); the humidity control device (2) comprises a water tank (201), an inner tank (202), an atomizing sheet (203), a switch (204), and a humidity sensor (205); and the evaporation box (3) comprises an electronic balance (301), a partition (302), a fan (303), and a temperature sensor (304).

2. The mattress moisture permeability detection device according to claim 1, characterized in that: The moisture permeable box (102) is nested in the built-in water storage box (101), and at the same time, four threaded through holes (106) are provided on the top edge platforms of the built-in water storage box (101) and the moisture permeable box (102). The lifting connecting rod (104) passes through the threaded through holes (106) and is used in combination with two hexagonal nuts (105) to achieve height adjustment of the built-in water storage box (101).

3. The mattress moisture permeability detection device according to claim 1, characterized in that: The constant temperature heating rod (103) is installed on the bottom plate of the built-in water storage box (101) to heat the water in the built-in water storage box (101) at a constant temperature.

4. The mattress moisture permeability detection device according to claim 1, characterized in that: The switch (204) is arranged on the outer wall of the water tank (201), and the inner tank (202) is limited in position in the water tank (201) by means of a movable buckle (206).

5. The mattress moisture permeability testing device according to claim 1, characterized in that: The atomizing sheet (203) is fixed on the side wall of the inner container (202), and the humidity sensor (205) is fixed on the inner wall of the right side plate of the evaporation box (3).

6. The mattress moisture permeability detection device according to claim 1, characterized in that: The left and right side plates of the evaporation box (3) are respectively provided with square holes (305), and the fans (303) are respectively installed in the square holes (305).

7. The mattress moisture permeability detection device according to claim 1, characterized in that: The electronic balance (301) is placed on the bottom plate of the evaporation box (3), and the partition (302) is provided with an opening matching the size of the moisture permeable box (102); the moisture permeable box is placed on the electronic balance (301) through the opening to achieve position limiting of the moisture permeable box (102).

8. The mattress moisture permeability detection device according to claim 1, characterized in that: The temperature sensor (304) is fixed on the top plate of the evaporation box (3) to achieve accurate control of the temperature inside the evaporation box (3).

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