False twister compressed air dehumidifying and filtering device capable of easily dyeing polyurethane

Abstract

A false twister compressed air dehumidifying and filtering device easy to dye polyurethane comprises a compressed air header pipe and a plurality of compressed air branch pipes connected with the compressed air header pipe, and the compressed air branch pipes are connected with an air inlet of a false twister. A pressure reducing valve, a heater, a temperature sensor and a compressed air filter group are sequentially arranged on the compressed air header pipe in the air conveying direction; a pressure reducing valve and a flow meter are sequentially arranged on the compressed air branch pipe in the air conveying direction; the heater is arranged in front of the compressed air filter set and heats and vaporizes most of liquid water in the compressed air, so that the filtering load of the compressed air filter set is reduced. Compared with the prior art, the device has the advantages that the design that compressed air is firstly heated and then filtered is adopted, so that the liquid water content in the compressed air can be greatly reduced, meanwhile, the problem that the filtering effect is reduced due to the fact that the compressed air is directly filtered and a filtering medium is moist is solved, impurities can be effectively removed, cohesive force deviation of spandex filaments is greatly improved, and the service life of the spandex filaments is prolonged. And the filter element is low in filtering load, long in replacement period and high in economical efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of spandex spinning technology, specifically referring to a false twister compressed air dehumidification and filtration device for easily dyed polyurethane. Background Technology

[0002] In spandex spinning, the multiple filaments ejected from the spinneret are arranged vertically and parallel, lacking cohesion and prone to loosening, which affects subsequent winding processes. Therefore, a false twisting process is required before winding the spandex filaments. False twisting involves rotating and winding the multiple vertically parallel filaments, thereby increasing the cohesion between the spandex filaments, enhancing their elasticity, and facilitating subsequent winding. Currently, the false twisting method used for spandex filaments involves introducing high-velocity compressed air into the twisting holes through which the spandex filaments pass. The compressed air, guided by the twisting holes, generates rotation, causing the spandex filaments to rotate and wind, thus completing the false twist.

[0003] The quality of compressed air is directly related to the false twist effect. Currently, false twisters in the industry generally use compressed air produced by the air compressor system. Although the air compressor system has oil removal, water removal, and impurity removal processes, there is still a problem of poor uniformity of the cohesion of the spandex yarn. The relative deviation of the cohesion is generally 200%. Poor cohesion will cause the spandex structure to be loose, not resistant to friction, and have reduced strength. It is also prone to splitting and breaking during the weaving process and is not durable. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to design a dehumidification and filtration device for compressed air of a false twister that is easy to dye polyurethane, which can effectively improve the quality of compressed air, reduce the relative deviation of the cohesion of spandex spinning, and improve the uniformity of cohesion.

[0005] This utility model is implemented as follows:

[0006] A compressed air dehumidification and filtration device for a false twister that is prone to dyeing polyurethane includes: a main compressed air pipe and several compressed air branch pipes connected thereto, wherein the compressed air branch pipes are connected to the air inlet of the false twister.

[0007] The compressed air main pipe is provided with a pressure reducing valve, a heater, a temperature sensor and a compressed air filter group in sequence along the air delivery direction;

[0008] The pressure reducing valve and flow meter are sequentially installed on the compressed air branch pipe along the air delivery direction;

[0009] The heater is located before the compressed air filter assembly to heat and vaporize most of the liquid water in the compressed air, thereby reducing the filtration load of the compressed air filter assembly.

[0010] Furthermore, a heater bypass is provided on the main compressed air pipe before and after the heater, a heater bypass valve is provided on the heater bypass, and a heater valve is provided before and after the heater.

[0011] Furthermore, the compressed air filter assembly includes at least one compressed air filter, or multiple compressed air filters connected in series, and the pore size of the compressed air filter is ≤3um.

[0012] Furthermore, the heating temperature of the heater is 26±5℃.

[0013] Furthermore, the compressed air filter group consists of multiple groups connected in parallel on the compressed air main pipe, with two groups connected in parallel.

[0014] Furthermore, the temperature sensor is connected to the heater via a signal line.

[0015] Furthermore, it also includes an emergency control cabinet that receives temperature sensor signals and sends control signals to the equipment, the emergency control cabinet being connected to the heater, the heater valve, the heater bypass valve, and the temperature sensor via signal lines.

[0016] The advantages of this utility model are:

[0017] Because it adopts a design that heats the compressed air first and then filters it, it can significantly reduce the liquid water content in the compressed air. At the same time, it avoids the problem of the filter medium being wet and thus reducing the filtration effect when the compressed air is directly filtered. It can effectively remove impurities, greatly improve the cohesion deviation of the spandex yarn, and the filter element has a low filtration load, long replacement cycle, and high economy.

[0018] Because of the parallel design of heater bypass and compressed air filter group, the heater or compressed air filter can be maintained without interrupting production, and the device has strong safety and reliability.

[0019] Thanks to the interlocking control design of the heater, temperature sensor, heater valve, and heater bypass valve, the compressed air path can be automatically switched and the heater can be stopped when the heater reaches an abnormally high temperature, thus protecting the equipment and product quality and further improving safety and reliability. Attached Figure Description

[0020] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0023] Figure label:

[0024] 1-Compressed air main pipe, 11-Pressure reducing valve, 12-Heater valve, 13-Heater, 14-Heater bypass, 15-Heater bypass valve, 16-Temperature sensor, 17-Compressed air filter group valve, 18-Compressed air filter group, 181-Compressed air filter, 19-Emergency control cabinet, 2-Compressed air branch pipe, 21-Flow meter. Detailed Implementation

[0025] The following is combined with Figures 1 to 2 The embodiments of this utility model will be described in detail below.

[0026] A technical analysis was conducted on the problem of poor uniformity of cohesion in spandex yarns. The reason is that air compressor workshops in the industry are often far from production equipment, with pipelines typically three to four hundred meters long. Even if the air pipelines are insulated, condensation is still likely to occur again during the air transmission process. At the same time, long-distance pipeline transportation may also introduce new impurities into the compressed air from the inner wall of the pipeline.

[0027] Example 1

[0028] like Figure 1 As shown, this utility model discloses a compressed air dehumidification and filtration device for a false twister of easily dyed polyurethane, comprising: a main compressed air pipe 1 and several compressed air branch pipes 2 connected thereto, the ends of which are connected to the air inlet of the false twister. A pressure reducing valve 11, a heater 13, and a compressed air filter group 18 are sequentially arranged along the air delivery direction on the main compressed air pipe 1. The heater 13 heats the compressed air after long-distance delivery, converting most of the secondary condensate back into gaseous water.

[0029] A heater bypass 14 is also provided on the main compressed air pipe 1, which can be switched to for emergency use in case of heater 13 failure or blockage. Each compressed air filter group 18 includes at least one compressed air filter 181, preferably two compressed air filters 181 connected in series. The function of the compressed air filter 181 is to filter out oil mist, impurities, and a small amount of residual liquid water after the compressed air is heated by heater 13. Preferably, the two compressed air filter groups 18 are connected in parallel, one in operation and one on standby. Compressed air filter group valves 17 are provided before and after the compressed air filter group 18, which can be used to maintain the compressed air filter 181 without interrupting production. The compressed air filter group 18 uses a commercially available compressed air filter 181, with a preferred filter pore size of 3µm, which can achieve a filtration efficiency of 95%. Theoretically, a smaller filter pore size will result in a better filtration effect, but the equipment cost will also increase accordingly. A filter pore size of 3µm is sufficient to meet current filtration needs.

[0030] A pressure reducing valve 11 and a flow meter 21 are sequentially installed along the air delivery direction on the compressed air branch pipe 2 to reduce the pressure of the compressed air before supplying it to the false twister. A temperature sensor 16 is also installed on the pipeline between the heater 13, the heater bypass 14, and the compressed air filter group 18. The temperature sensor 16 is connected to the heater 13 via a signal line to transmit the temperature signal to the heater. When the temperature is too high, the heater reduces the heating power; when the temperature is too low, the heating power increases, thereby achieving automatic control of the heating temperature. At the same time, the compressed air temperature can be monitored when switching to the heater bypass 14. The heating temperature is controlled at 26±5℃, and the preferred heating type is resistance heating.

[0031] After the compressed air passes through the dehumidification and filtration device of the false twister compressed air dehumidification filter, the cohesion deviation of the spandex yarns decreases from 200% to 0.5%, greatly improving the uniformity of cohesion. In the initial design of the false twister compressed air dehumidification and filtration device, the compressed air filter group was located before the heater 13, which also significantly improved the cohesion deviation of the spandex yarns, reducing it from 200% to 50%. However, the filter element of the compressed air filter 181 is prone to clogging, requiring replacement every 7 days. Technical analysis suggests that this is due to excessive condensation generated secondary to the compressed air after long-distance transport. Excessive liquid water entering the filter medium makes it damp, reducing its permeability and affecting the filtration effect. This not only increases the cost of filter element consumables, but also, due to the reduced filtration effect, some impurities are not filtered out, resulting in a still high level of cohesion deviation. Therefore, the compressed air filter group 18 is placed after the heater 13, so that most of the condensate is converted into gaseous water after heating, reducing the load on the compressed air filter 181. Because the pipeline between the heater 13 and the false twister is short, the probability of the heated compressed air re-condensing is extremely low and can be ignored. The filter element replacement cycle is also extended from 7 days to 3 months, greatly improving the economic efficiency of the device.

[0032] Example 2

[0033] The compressed air filter 181 selected in Example 1 requires an ambient and fluid temperature of 0–60°C. Simultaneously, the compressed air temperature of the false twister should not be too high, as excessively high temperatures will reduce the strength of the spandex yarn. Therefore, if the heater 13 experiences abnormal overheating, the heater 13 and heater valve 12 should be shut off immediately, and the bypass should be opened to protect the compressed air filter 181 and the product quality.

[0034] like Figure 2Based on Embodiment 1, the false twist compressed air dehumidification and filtration device further includes an emergency control cabinet 19 that receives temperature sensor signals and sends control signals to the equipment. The emergency control cabinet 19 is connected to the heater 13, heater valve 12, heater bypass valve 15, and temperature sensor 16 via signal lines. When the temperature sensor 16 detects that the compressed air temperature exceeds a warning value, it sends a high-temperature signal to the emergency control cabinet 19. The emergency control cabinet 19 then opens the heater bypass valve 15 via signal lines and simultaneously closes the heater 13 and heater valve 12. This interlocking protection further enhances the safety of the false twist compressed air dehumidification and filtration device.

[0035] This utility model adopts a design of heating compressed air first and then filtering it, which can significantly reduce the liquid water content in compressed air. At the same time, it avoids the problem of the filter medium being wet and thus reducing the filtration effect when directly filtering compressed air. It can effectively remove impurities, greatly improve the cohesion deviation of spandex yarns, and the filter element has a low filtration load, long replacement cycle, and high economy.

[0036] Because of the parallel design of heater bypass and compressed air filter group, the heater or compressed air filter can be maintained without interrupting production, and the device has strong safety and reliability.

[0037] Thanks to the interlocking control design of the heater, temperature sensor, heater valve, and heater bypass valve, the compressed air path can be automatically switched and the heater can be stopped when the heater reaches an abnormally high temperature, thus protecting the equipment and product quality and further improving safety and reliability.

[0038] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A false twister compressed air dehumidifying filter device for easy dyeing polyurethane, characterized by: Comprise: A compressed air main pipe and several compressed air branch pipes connected thereto, the compressed air branch pipes being connected with the false twister air inlet; A pressure reducing valve, a heater, a temperature sensor and a compressed air filter group are sequentially arranged on the compressed air main pipe along the air conveying direction; The compressed air branch pipe is sequentially provided with the pressure reducing valve and a flow meter along the air conveying direction; The heater is arranged before the compressed air filter group to heat and vaporize most of the liquid water in the compressed air, thereby reducing the filtering load of the compressed air filter group.

2. A false twister compressed air dehumidifying filter device for easily dyeable polyurethane according to claim 1, characterized in that: A heater bypass is arranged before and after the heater on the compressed air main pipe, a heater bypass valve is arranged on the heater bypass, and a heater valve is arranged before and after the heater.

3. A false twister compressed air dehumidifying filter device for easily dyeable polyurethane according to claim 1, characterized in that: The compressed air filter group comprises at least one compressed air filter, and if there are multiple compressed air filters, they are connected in series, and the filter pore size of the compressed air filter is ≤3um.

4. A false twister compressed air dehumidifying filter device for easily dyeable polyurethane according to claim 3, characterized in that: The heating temperature of the heater is 26±5℃.

5. A false twister compressed air dehumidifying filter device for easily dyeable polyurethane as claimed in claim 3, characterized in that: The compressed air filter group is multiple groups connected in parallel on the compressed air main pipe, and the number of parallel connection is two groups.

6. A false twister compressed air dehumidifying filter device for easily dyeable polyurethane as claimed in claim 1, characterized in that: The temperature sensor is connected with the heater through a signal line.

7. A false twister compressed air dehumidifying filter device for easily dyeable polyurethane as claimed in claim 2, wherein: Further comprise: An emergency control cabinet for receiving the temperature sensor signal and sending a control signal to the equipment, the emergency control cabinet being connected with the heater, the heater valve, the heater bypass valve and the temperature sensor through a signal line.

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