Nitrogen recovery system of vulcanizing machine

Abstract

The utility model provides a vulcanizing machine nitrogen recovery system which comprises a nitrogen storage tank for storing nitrogen; the main pipeline is communicated with an outlet of the nitrogen storage tank; and the diverging pipe is positioned between the outlet of the nitrogen storage tank and the main pipeline, and the nitrogen flow rate of the main pipeline is reduced and the pressure of the main pipeline is ensured to meet an expected target by diverging the cross sectional area of the pipeline. By arranging the diverging pipe between the outlet of the nitrogen storage tank and the inlet of the main pipeline, the flow rate of nitrogen can be remarkably reduced, erosive wear to the main pipeline is reduced, the reliability of the system is improved, the service life of the system is prolonged, and meanwhile, the pressure of the main pipeline can be kept within a reasonable range.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vulcanizing machine nitrogen recovery technical field, specifically relates to a vulcanizing machine nitrogen recovery system. BACKGROUND

[0002] In the rubber vulcanization production process, the vulcanizing machine nitrogen recovery system plays an indispensable role.

[0003] In the nitrogen recovery process, the scouring and wearing problem of high-speed nitrogen flow to the main pipeline gradually highlights. When nitrogen is discharged from the vulcanizing machine, it usually has high pressure and flow rate. Taking the common vulcanization process as an example, the discharged nitrogen pressure can reach 26 kg / cm² (about 2.6 MPa), under the action of such high pressure, the nitrogen flow rate is extremely fast. When the high-speed nitrogen flow contacts the inner wall of the main pipeline, it will produce strong scouring effect, causing the material of the inner wall of the main pipeline to be gradually worn, the pipe wall to be thinned, and even cracks, perforation and other damage conditions to appear.

[0004] At present, in order to solve the scouring and wearing problem of nitrogen flow rate to the main pipeline, mainly through the ways such as thickening the pipe wall of the main pipeline or smearing wear-resistant coating on the inner wall of the pipeline, but there are still many deficiencies:

[0005] Firstly, the way of thickening the pipe wall of the main pipeline not only increases the material cost, but also the thickened pipe wall will still be gradually eroded with the continuous wearing, which cannot fundamentally solve the problem.

[0006] Secondly, although the way of smearing wear-resistant coating alleviates the wearing to some extent, the service life of the wear-resistant coating is short, and it needs to be reapplied regularly, which has high maintenance cost.

[0007] In addition, the above methods often only focus on reducing the wearing in one aspect, and ignore the influence on other performances of the nitrogen recovery system, such as may change the airflow characteristics in the pipeline, affect the nitrogen recovery efficiency, or block the pipeline when the coating falls off, cause new problems. UTILITY MODEL CONTENTS

[0008] In order to solve the above technical problems, the utility model provides a vulcanizing machine nitrogen recovery system, which comprises:

[0009] A nitrogen storage tank for storing nitrogen;

[0010] A main pipeline in communication with the outlet of the nitrogen storage tank; and

[0011] A gradually expanding pipe between the outlet of the nitrogen storage tank and the main pipeline, which reduces the nitrogen flow rate of the main pipeline through the cross-sectional area of the gradually expanding pipe and ensures that the pressure of the main pipeline meets the expected target.

[0012] Further, the inlet diameter of the gradual expansion pipe , the outlet diameter of the gradual expansion pipe satisfy the relationship: .

[0013] Further, the inlet diameter of the gradual expansion pipe is in the range of: ;

[0014] The outlet diameter of the gradual expansion pipe is in the range of: .

[0015] Further, the gradual expansion section length of the gradual expansion pipe is in proportional relationship with the inlet diameter of the gradual expansion pipe , and satisfies the relationship: 4.

[0016] Further, the outlet diameter of the gradual expansion pipe satisfies the relationship with the diameter of the main pipeline : .

[0017] Further, the gradual expansion angle of the gradual expansion pipe is in the range of: 10° 20°.

[0018] Further, the pressure of the main pipeline satisfies the relationship: .

[0019] Further, the outlet end of the gradual expansion pipe is welded in communication with the inlet end of the main pipeline.

[0020] Further, a cut-off valve, a buffer tank and a stop valve are sequentially arranged between the outlet of the nitrogen storage tank and the inlet of the gradual expansion pipe.

[0021] Further, the buffer tank is used for stabilizing the nitrogen flow, and the distance between the buffer tank and the main pipeline is in the range of: 0.8m-1.2m.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] The utility model discloses a gradual expansion pipe arranged between the outlet of the nitrogen storage tank and the inlet of the main pipeline, which can significantly reduce the nitrogen flow rate, reduce the scouring and wearing of the main pipeline, improve the reliability and service life of the system, and keep the pressure of the main pipeline in a reasonable range. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The system structure schematic view disclosed by the utility model embodiment is shown in the figure.

[0025] Figure 2 The flow rate change curve diagram of the embodiment of the present application with or without the gradually expanding pipe;

[0026] Figure 3 The pressure change curve of the embodiment of the present application with or without the gradually expanding pipe.

[0027] In the figure:

[0028] 10, nitrogen storage tank; 11, shut-off valve;

[0029] 20, buffer tank; 21, stop valve;

[0030] 30, gradually expanding pipe;

[0031] 40, main pipeline. DETAILED DESCRIPTION

[0032] In order to make the technical scheme and technical effects of the present application more clear, the technical scheme in the embodiment of the present application will be described clearly and completely in combination with the drawings in the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0033] The present application provides a nitrogen recovery system of vulcanizing machine, which can significantly reduce the nitrogen flow rate, reduce the erosion and wear of the main pipeline, and further improve the reliability and life of the system.

[0034] Please refer to Figure 1 The nitrogen recovery system mainly comprises a nitrogen storage tank 10, a buffer tank 20 and a main pipeline 40. A gradually expanding pipe 30 is communicated between the outlet of the nitrogen storage tank 10 and the main pipeline 40, and the cross-sectional area of the gradually expanding pipe is used to reduce the nitrogen flow rate of the main pipeline 40 and ensure that the pressure of the main pipeline 40 meets the expected target.

[0035] The nitrogen storage tank 10 is used to store nitrogen with an initial pressure of 26 kg / cm² (about 2.6 MPa).

[0036] The buffer tank 20 is used to stabilize the nitrogen flow. The distance between the buffer tank 20 and the main pipeline 40 is in the range of 0.8 m-1.2 m. Preferably, the distance between the buffer tank 20 and the main pipeline 40 is 1 m, and the outlet diameter of the buffer tank 20 is about 40 mm.

[0037] The diameter of the main pipeline 40 is about 150 mm, and the back pressure of the main pipeline 40 should meet the following relationship: .

[0038] A shut-off valve 11 is arranged between the nitrogen storage tank 10 and the buffer tank 20, and a stop valve 21 is arranged between the buffer tank 20 and the main pipeline 40.​

[0039] The outlet end of the diffuser tube 30 is welded in communication with the inlet end of the main pipe 40.

[0040] In order to ensure that the pressure is within a reasonable range and the nitrogen flow rate is significantly reduced, the design parameters of the diffuser tube 30 should satisfy the following conditions:

[0041] The inlet diameter of the diffuser tube 30 , the outlet diameter of the diffuser tube 30 satisfy the relationship: .

[0042] The inlet diameter of the diffuser tube 30 is in the range of: ; the outlet diameter of the diffuser tube 30 is in the range of: .

[0043] The length of the diffuser section of the diffuser tube 30 is in direct proportion to the inlet diameter of the diffuser tube 30 , and satisfies the relationship: 4.

[0044] The outlet diameter of the diffuser tube 30 and the diameter of the main pipe 40 satisfy the relationship: .

[0045] The diffuser angle of the diffuser tube 30 is in the range of: 10° 20°.

[0046] Firstly, the technical effects brought by the diffuser tube 30 are verified.

[0047] Experimental conditions:

[0048] The initial pressure of nitrogen is 26 kg / cm² (about 2.6 MPa).

[0049] The distance between the shut-off valve 11 and the buffer tank 20 is 200 mm.

[0050] The outlet diameter of the buffer tank 20 is 40 mm; the distance from the outlet of the buffer tank 20 to the main pipe 40 is 1 m.

[0051] The pipe diameter is 40 mm.

[0052] The back pressure of the main pipe 40 is 3 kg / cm² (about 0.3 MPa).

[0053] The inlet diameter of the diffuser tube 30 = 40 mm, and the outlet diameter of the diffuser tube 30 = 70 mm.

[0054] The experimental results are compared in terms of flow rate and pressure, as shown in the following table:

[0055]

[0056] Please refer to Figures 2-3 Through the comparison of experiments with and without the gradual expansion pipe 30, it is found that setting the gradual expansion pipe 30 can not only ensure that the pressure of the main pipe 40 is within a reasonable range, but also significantly reduce the nitrogen flow rate of the main pipe 40.

[0057] Next, in order to verify the effectiveness of the above-mentioned parameter range of the gradual expansion pipe 30, the following multiple sets of experiments are conducted to test the pressure and flow rate changes under different parameter combinations.

[0058] Experiment 1

[0059] The inlet diameter of the gradual expansion pipe 30 = 40 mm, and the outlet diameter of the gradual expansion pipe 30 = 70 mm;

[0060] The gradual expansion angle of the gradual expansion pipe 30 = 15°;

[0061] The gradual expansion segment length of the gradual expansion pipe 30 = 113.9 mm;

[0062] The diameter of the main pipe 40 = 150 mm.

[0063] The results of Experiment 1 show that:

[0064] At 1 second, the pressure is 2.394 MPa, and the flow rate is 32.4 m / s;

[0065] At 18 seconds, the pressure is 0.303 MPa, and the flow rate is 2.3 m / s.

[0066] It meets the expected target.

[0067] Experiment 2

[0068] The inlet diameter of the gradual expansion pipe 30 = 50 mm, and the outlet diameter of the gradual expansion pipe 30 = 80 mm;

[0069] The gradual expansion angle of the gradual expansion pipe 30 = 12°;

[0070] The gradual expansion segment length of the gradual expansion pipe 30 = 150 mm;

[0071] The diameter of the main pipe 40 = 150 mm.

[0072] The results of Experiment 2 show that:

[0073] At 1 second, the pressure was 2.420 MPa and the flow rate was 26.0 m / s;

[0074] At 18 seconds, the pressure was 0.310 MPa and the flow rate was 1.8 m / s.

[0075] The desired objective was met.

[0076] Experiment 3

[0077] The inlet diameter of the diffuser tube 30 = 60 mm, the outlet diameter of the diffuser tube 30 = 100 mm;

[0078] The diffuser angle of the diffuser tube 30 = 20°;

[0079] The length of the diffuser section of the diffuser tube 30 = 180 mm;

[0080] The diameter of the main pipe 40 = 150 mm.

[0081] The results of Experiment 3 show that:

[0082] At 1 second, the pressure was 2.450 MPa and the flow rate was 20.0 m / s;

[0083] At 18 seconds, the pressure was 0.320 MPa and the flow rate was 1.5 m / s.

[0084] The desired objective was met.

[0085] While the embodiments of the present application have been shown and described with reference to certain examples, it is to be understood that the embodiments are not limited to the details of the foregoing embodiments, but can be carried out with various changes, modifications, substitutions, and alterations of the embodiments without departing from the spirit and scope of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A curing press nitrogen recovery system characterized by, Comprise: A nitrogen storage tank (10) for storing nitrogen; A main pipe (40) in communication with the outlet of the nitrogen storage tank (10); and A gradually expanding pipe (30) between the outlet of the nitrogen storage tank (10) and the inlet of the main pipe (40) to reduce the nitrogen flow rate of the main pipe (40) and ensure that the pressure of the main pipe (40) meets the expected target by gradually expanding the cross-sectional area of the pipe.

3. The nitrogen recovery system of the vulcanizing machine according to claim 2, characterized in that:

2. The nitrogen recovery system for curing press according to claim 1, wherein The inlet diameter of the diverging tube (30) , the outlet diameter satisfies the relationship: . The outlet end of the gradually expanding pipe (30) is welded in communication with the inlet end of the main pipe (40). The inlet diameter of the diffuser (30) The scope is: ; The outlet diameter of the diverging pipe (30) is in the range of . .

4. The nitrogen recovery system for curing press according to claim 2, wherein The length of the diverging section of the diverging pipe (30) is proportional to the inlet diameter of the diverging pipe (30) and satisfies the relationship:

4.

5. The nitrogen recovery system for curing press according to claim 2, wherein The outlet diameter of the diverging pipe (30) The diameter of the main pipe (40) satisfies the relationship: .

6. The nitrogen recovery system for curing press according to claim 1, wherein, The diverging angle of the diverging pipe (30) is in the range of: 10° 20°. 20°.

7. The nitrogen recovery system for curing press according to claim 1, wherein The pressure of the main pipe (40) satisfies the relationship: .

8. The nitrogen recovery system for curing press according to claim 1, wherein, A cut-off valve (11), a buffer tank (20) and a stop valve (21) are sequentially arranged between the outlet of the nitrogen storage tank (10) and the inlet of the gradually expanding pipe (30).

9. The nitrogen recovery system for curing press according to claim 1, wherein, The buffer tank (20) is used for stabilizing the nitrogen flow, and the distance of the buffer tank (20) from the main pipe (40) is in the range of 0.8m-1.2m.

10. The nitrogen recovery system for curing press according to claim 9, wherein, ​

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