Nitrogen recovery system for BTTZ cable production

Abstract

The utility model discloses a nitrogen recovery system for BTTZ cable production in the field of cable production. The nitrogen recovery system comprises a suction port, a suction machine, an air filter, an air compressor, an SMN membrane separation nitrogen-making device and a nitrogen recycling mechanism which are connected in sequence, the number of the suction ports is two, and each suction port comprises an annular gas collecting hood. The filter screen is arranged in the gas collecting hood, and the filter screen and the gas collecting hood are coaxially arranged; the negative pressure ring is arranged on the right side of the gas collecting hood, and the negative pressure ring and the gas collecting hood are coaxially arranged; the negative pressure ring is communicated with a suction machine; the flange plate is arranged on the right side of the negative pressure ring and is coaxial with the negative pressure ring; the suction pipes are distributed in a central symmetry mode, and the two ends of each suction pipe are communicated with the gas collecting hood and the negative pressure ring respectively. By means of the design, nitrogen seeping out of the annealing furnace can be efficiently and thoroughly recycled, the recycling rate is high, and meanwhile the purity of the recycled and prepared nitrogen is higher.

Description

Technical Field

[0001] The utility model relates to the field of cable production, in particular to a nitrogen recovery system for BTTZ cable production. Background Art

[0002] At present, the BTTZ cable production method is widely used in China. According to the main process, we named it the copper strip longitudinal wrapping argon arc welding continuous rolling high-frequency annealing production line. Its main processes are copper strip pickling, edge trimming, argon arc welding, magnesium powder filling, continuous rolling, high-frequency annealing, gas reduction, and water cooling.

[0003] The above-mentioned gas reduction step mainly utilizes the characteristics of nitrogen inert gas to fill the annealing furnace to prevent oxygen from entering, thereby preventing the cable copper sheath from oxidizing and turning black at high temperature; since the two ends of the return furnace need to continuously feed and discharge materials, the nitrogen filled in the annealing furnace will continuously seep out from these two ends. In order to ensure the gas reduction effect, the gas reduction device must be continuously filled with nitrogen, which will consume a large amount of nitrogen. However, there is no relevant nitrogen recovery device in the existing cable production line, so the waste of nitrogen is very serious. Utility Model Content

[0004] The utility model aims to provide a nitrogen recovery system for BTTZ cable production which can efficiently and thoroughly recover nitrogen seeping from an annealing furnace.

[0005] The purpose of the utility model is achieved as follows: a nitrogen recovery system for BTTZ cable production, comprising a suction port, a suction machine, an air filter, an air compressor, an SMN membrane separation nitrogen production device, and a nitrogen recovery and utilization mechanism connected in sequence;

[0006] There are two suction ports, both of which include an air collecting hood, which is annular; a filter, which is arranged inside the air collecting hood and coaxially with it; a negative pressure ring, which is arranged on the right side of the air collecting hood and coaxially with it; the negative pressure ring is connected to the suction machine; a flange, which is arranged on the right side of the negative pressure ring and coaxially with it; a suction pipe, which has a plurality of suction pipes and is symmetrically distributed around the center, and both ends of each of the suction pipes are respectively connected to the air collecting hood and the negative pressure ring.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows: the nitrogen recovery system provided by the utility model can efficiently and thoroughly recover the nitrogen seeping out of the annealing furnace, and the recovery utilization rate is high, and the purity of the recovered and prepared nitrogen is also higher; specifically, an annular suction port is respectively arranged at the feeding end and the discharging end of the annealing furnace, and the nitrogen seeping out can be sucked 360 degrees without dead angles, so that the suction is more thorough; the suction machine and the air compressor are used for cooperative pumping, and the suction force is stronger and the suction efficiency is higher; the SMN membrane separation nitrogen making device is used for nitrogen production, and the purity of the prepared nitrogen is higher; the recovered nitrogen can be directly stored in a nitrogen storage tank for standby, or can be stored in a liquid nitrogen storage tank after liquefaction, or can be directly connected to the nitrogen supply pipe of the gas reduction device, so the recovery utilization rate is high.

[0008] As a preferred solution of the utility model, the suction port also includes a suction area adjustment device that can adjust the suction area inside the gas collecting hood, and the suction area adjustment device includes a fixed seat, which is arranged on the left side of the gas collecting hood and has a positioning knob; and an adjustment sleeve, which can be slidably inserted on the fixed seat and the filter screen. This design has a simple structure, is easy to adjust, and can ensure that while fully sucking the nitrogen permeated from the annealing furnace, it has a higher suction force.

[0009] Furthermore, the nitrogen recovery and utilization mechanism comprises a nitrogen liquefaction device and a liquid nitrogen storage tank which are connected in sequence, and the nitrogen outlet of the SMN membrane separation nitrogen production device is connected to the nitrogen liquefaction device.

[0010] Furthermore, the nitrogen recovery and utilization mechanism is a nitrogen gas storage tank, and the nitrogen outlet end of the SMN membrane separation nitrogen production device is connected to the nitrogen gas storage tank.

[0011] Furthermore, the nitrogen recovery and utilization mechanism is a nitrogen supply pipe of the gas reduction device, and the nitrogen outlet of the SMN membrane separation nitrogen production device is connected to the nitrogen supply pipe. This design can directly reduce the nitrogen required to be provided by the gas reduction device.

[0012] Furthermore, the non-nitrogen gas outlet of the SMN membrane separation nitrogen production device is connected to a non-nitrogen gas storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structural composition of the utility model.

[0014] Figure 2 It is a structural schematic diagram of the suction port of the utility model.

[0015] Among them, 1 is a gas collecting hood, 2 is a filter screen, 3 is a negative pressure ring, 4 is a flange, 5 is a suction pipe, 6 is a fixing seat, 6a is a positioning knob, 7 is an adjusting sleeve, 8 is an annealing furnace, and 9 is a cable. DETAILED DESCRIPTION

[0016] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0017] Combined with Figure 1 and 2 As shown, a nitrogen recovery system for BTTZ cable production includes a suction port, a suction machine, an air filter, an air compressor, an SMN membrane separation nitrogen production device, and a nitrogen recovery mechanism connected in sequence; there are two suction ports, both of which include an air collecting hood 1, and the air collecting hood 1 is annular; a filter 2, the filter 2 is arranged inside the air collecting hood 1 and is coaxially arranged therewith; a negative pressure ring 3, the negative pressure ring 3 is arranged on the right side of the air collecting hood 1 and is coaxially arranged therewith; the negative pressure ring 3 is connected to the suction machine; a flange 4, the flange 4 is arranged on the right side of the negative pressure ring 3 and is coaxially arranged therewith; a suction pipe 5, there are a plurality of the suction pipes 5, and they are symmetrically distributed in the center, and both ends of each of the suction pipes 5 are respectively connected to the air collecting hood 1 and the negative pressure ring 3;

[0018] It should be noted that the above two suction ports are respectively arranged at the feeding end and the discharging end of the annealing furnace; during suction recovery, the nitrogen permeated from the annealing furnace flows into the gas collecting hood 1 through the filter screen 2, then flows into the negative pressure ring 3 through the suction pipe 5, and then flows into the suction machine;

[0019] It should also be noted that the suction power of the vacuum machine and the air compressor needs to match the gas supply rate of the gas reduction device. If the suction power is large, it is easy to suck in a large amount of external air. If the suction power is small, it is easy for the suction recovery to be incomplete.

[0020] The suction port further includes a suction area adjustment device capable of adjusting the suction area inside the gas collecting hood. The suction area adjustment device includes a fixing seat 6, which is arranged on the left side of the gas collecting hood 1 and has a positioning knob 6a thereon; an adjustment sleeve 7, which is slidably inserted on the fixing seat 6 and the filter screen 2;

[0021] It should be noted that when adjusting the suction area, loosen the positioning knob 6a, move the adjustment sleeve 7 to an appropriate position, and then tighten the positioning knob 6a to lock and fix the adjustment sleeve 7; as the adjustment sleeve 7 is extended, the more the filter screen 2 is blocked, the smaller the suction area, and vice versa;

[0022] It should also be noted that, when the power of the suction machine and air compressor remains unchanged, the larger the suction area, the smaller the suction force, and the smaller the suction area, the greater the suction force. The size of the suction force also has a great influence on the suction and recovery effect of nitrogen.

[0023] The nitrogen recovery and utilization mechanism comprises a nitrogen liquefaction device and a liquid nitrogen storage tank which are connected in sequence, and the nitrogen outlet end of the SMN membrane separation nitrogen production device is connected to the nitrogen liquefaction device.

[0024] The nitrogen recovery and utilization mechanism is a nitrogen gas storage tank, and the nitrogen outlet end of the SMN membrane separation nitrogen production device is connected to the nitrogen gas storage tank.

[0025] The nitrogen recovery and utilization mechanism is a nitrogen supply pipe of the gas reduction device, and the nitrogen outlet end of the SMN membrane separation nitrogen production device is connected to the nitrogen supply pipe.

[0026] The non-nitrogen gas outlet end of the SMN membrane separation nitrogen production device is connected to a non-nitrogen gas storage tank;

[0027] It should be noted that the non-nitrogen gas outlet of the above-mentioned SMN membrane separation nitrogen production device can also be directly connected to the external atmosphere.

[0028] During operation, the suction machine pumps the nitrogen permeated from the annealing furnace to the air filter through the suction port, and then sends it to the air compressor after being filtered by the air filter. After being compressed and pressurized by the air compressor, it flows into the SMN membrane separation nitrogen production device, and is separated into nitrogen and non-nitrogen after being processed by the SMN membrane separation nitrogen production device. The nitrogen part can be directly stored in the nitrogen storage tank for standby, or can be stored in the liquid nitrogen storage tank after being liquefied by the nitrogen liquefaction device, or can be directly connected to the nitrogen supply pipe of the gas reduction device. The non-nitrogen gas can be directly discharged into the air, or stored in the non-nitrogen storage tank.

[0029] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A nitrogen recovery system for BTTZ cable production, characterized by: The nitrogen recovery system includes a suction port, a suction machine, an air filter, an air compressor, an SMN membrane separation nitrogen production device, and a nitrogen recovery and utilization mechanism which are connected in sequence; There are two suction ports, both of which include An air collecting hood (1), wherein the air collecting hood (1) is annular; A filter screen (2), the filter screen (2) being arranged inside the gas collecting hood (1) and coaxially arranged therewith; A negative pressure ring (3), the negative pressure ring (3) being arranged on the right side of the gas collecting hood (1) and being coaxially arranged therewith; the negative pressure ring (3) being connected to a suction machine; A flange (4), wherein the flange (4) is arranged on the right side of the negative pressure ring (3) and is coaxially arranged therewith; A suction pipe (5), wherein there are a plurality of suction pipes (5) which are centrally symmetrically distributed, and both ends of each suction pipe (5) are respectively connected to the gas collecting hood (1) and the negative pressure ring (3).

2. A nitrogen recovery system for BTTZ cable production according to claim 1, characterized in that: The suction port also includes a suction area adjustment device that can adjust the suction area inside the gas collecting hood, and the suction area adjustment device includes A fixing seat (6), the fixing seat (6) being arranged on the left side of the gas collecting hood (1) and having a positioning knob (6a) thereon; An adjusting sleeve (7) is slidably inserted on the fixing seat (6) and the filter screen (2).

3. A nitrogen recovery system for BTTZ cable production according to claim 1 or 2, characterized in that: The nitrogen recovery and utilization mechanism comprises a nitrogen liquefaction device and a liquid nitrogen storage tank which are connected in sequence, and the nitrogen outlet end of the SMN membrane separation nitrogen production device is connected to the nitrogen liquefaction device.

4. A nitrogen recovery system for BTTZ cable production according to claim 1 or 2, characterized in that: The nitrogen recovery and utilization mechanism is a nitrogen gas storage tank, and the nitrogen outlet end of the SMN membrane separation nitrogen production device is connected to the nitrogen gas storage tank.

5. A nitrogen recovery system for BTTZ cable production according to claim 1 or 2, characterized in that: The nitrogen recovery and utilization mechanism is a nitrogen supply pipe of a gas reduction device, and the nitrogen outlet end of the SMN membrane separation nitrogen production device is connected to the nitrogen supply pipe.

6. A nitrogen recovery system for BTTZ cable production according to claim 1 or 2, characterized in that: The non-nitrogen gas outlet end of the SMN membrane separation nitrogen production device is connected to a non-nitrogen gas storage tank.

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