Volatile raw material recovery equipment for PVDF coating production

Abstract

The utility model discloses volatile raw material recovery equipment for PVDF (Polyvinylidene Fluoride) coating production, relates to the technical field of coating production, and solves the technical problem that volatile raw materials discharged in the PVDF coating production process are difficult to fully condense, so that the recovery efficiency is influenced. Comprising a condensing box, a transverse plate is installed in the condensing box and divides the condensing box into an upper cavity and a lower cavity, a plurality of evenly-distributed barrels are installed in the upper cavity, an inner pipe is arranged in the center of each barrel, a condensing area is formed between each inner pipe and the corresponding barrel, a spiral condensing pipe is installed in each condensing area, and a plurality of isolating rings are installed in each condensing area; the multiple isolating rings divide the condensation area into multiple heat exchange cavities, and a communicating pipe is installed between the ends of every two adjacent condensation pipes. The condensation flow path of volatile raw materials is effectively prolonged, full condensation and recovery are achieved, large temperature difference does not occur in all condensation sections, and uniform condensation is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coating production, in particular to a volatile raw material recovery device for PVDF coating production. Background Art

[0002] PVDF coating, or polyvinylidene fluoride coating, is a high-performance coating mainly based on PVDF (polyvinylidene fluoride) resin. It inherits many excellent properties of PVDF materials, such as excellent chemical resistance, UV resistance, heat resistance and wear resistance. This coating is widely used in chemical, construction, electronics and other fields. In the process of producing PVDF coating, because the coating usually contains solvents and other volatile components, these solvents and volatile components are easy to volatilize during the production and stirring of the coating.

[0003] In order to reduce the generation of volatile raw materials and reduce the impact on the environment, volatile raw materials are usually recovered by condensation. For example, a Chinese patent authorization number CN211754946U discloses a volatile raw material recovery device in the production of PVDF fluorocarbon coatings. The volatile raw materials are introduced into the condensation chamber through a corrugated condenser tube to achieve condensation recovery.

[0004] The volatile raw materials pass through the condensation chamber via the condensation tube, and the condensation path is short, which cannot ensure that the volatile raw materials are fully condensed, thus affecting the recovery efficiency of the volatile raw materials. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a volatile raw material recovery device for PVDF coating production, which solves the problem that the volatile raw materials discharged during the PVDF coating production process are difficult to fully condense, thereby affecting the recovery efficiency.

[0006] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the utility model, a volatile raw material recovery device for PVDF coating production is proposed, comprising a condensing box, a horizontal plate is installed in the condensing box, and the horizontal plate divides the condensing box into an upper cavity and a lower cavity, and a plurality of evenly distributed cylinders are installed in the upper cavity, an inner tube is provided at the center of the cylinder, a condensation zone is formed between the inner tube and the cylinder, a spiral condensing tube is installed in the condensing zone, and a plurality of isolation rings are installed in the condensing zone, and the plurality of isolation rings divide the condensing zone into a plurality of heat exchange chambers, a connecting pipe is installed between the ends of two adjacent condensing tubes, an air inlet pipe is penetrated through the side wall of the condensing box near the top, and the air inlet pipe is connected to the corresponding condensing tube, a liquid delivery pipe for conveying cold medium is provided above the condensing box, a liquid supply assembly is installed between the liquid delivery pipe and the heat exchange chamber, a reflux pipe and a collecting pipe are provided in the lower cavity, a reflux assembly is installed between the reflux pipe and the heat exchange chamber, and an overflow assembly is installed between the collecting pipe and the condensing tube.

[0007] As a further technical solution of the utility model, the overflow assembly includes a conduit connected to the bottom of the condenser tube, the conduit extends downward through the horizontal plate, and an annular shell is mounted near the bottom of the conduit, the side wall of the annular shell near the top is connected to an overflow pipe in the shape of a " ", and the bottom end of the overflow pipe is connected to the collecting pipe.

[0008] As a further technical solution of the utility model, the liquid supply assembly includes a branch pipe located at the center of the inner tube, the bottom end of the branch pipe is a sealing structure, and the top end of the branch pipe is connected to the liquid delivery pipe, and a liquid outlet connected to the heat exchange chamber is installed on the tube wall of the branch pipe.

[0009] As a further technical solution of the present invention, the reflux assembly includes multiple vertical pipes connected to the top of the reflux pipe, the top of the vertical pipe passes through the horizontal plate and is connected to the upper surface inside the condensation box, and the side wall of the vertical pipe is equipped with a drain port connected to the top side wall of the heat exchange chamber.

[0010] As a further technical solution of the utility model, a liquid outlet pipe is connected between the bottom of the annular shell and the top of the collecting pipe, and a one-way valve is installed on the liquid outlet pipe.

[0011] As a further technical solution of the utility model, a partition is symmetrically installed between the cylinder away from the air inlet pipe and the wall of the condensation box, an adsorption chamber is formed between the partition and the end of the condensation box, a plurality of adsorption layers are installed in the adsorption chamber, an exhaust pipe is connected between the condensation pipe away from the air inlet pipe and the adsorption chamber, and a pressure relief port is installed on the side wall of the adsorption chamber near the top.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, the volatile raw materials generated in the production process of PVDF coatings are conveniently introduced into the condenser tubes in the condenser box through the air inlet pipe, and the connecting pipe is used to facilitate the volatile raw materials to flow through multiple spiral condenser tubes in sequence, greatly extending the flow path of the volatile raw materials and facilitating full condensation.

[0014] 2. In the utility model, an isolation ring is provided to conveniently divide the condensation area formed between the inner tube and the cylinder into multiple heat exchange chambers, and a liquid delivery pipe and a liquid supply assembly are used to conveniently introduce the refrigerated medium into multiple heat exchange chambers respectively, so that the medium temperature in each heat exchange chamber will not produce a large temperature difference, which is convenient for achieving uniform condensation. The reflux assembly is used to conveniently discharge the medium after heat exchange in the heat exchange chamber through the reflux pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of a volatile raw material recovery device for PVDF coating production according to the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of a volatile raw material recovery device for PVDF coating production according to the utility model;

[0017] Figure 3 This is a three-dimensional diagram of the connection part between the adsorption layer and the cylinder in a volatile raw material recovery device for PVDF coating production according to the utility model;

[0018] Figure 4 This is a three-dimensional diagram of an adsorption layer in a volatile raw material recovery device for PVDF coating production according to the utility model;

[0019] Figure 5 for Figure 2 Enlarged view of part A.

[0020] In the figure: 1. condenser box; 2. horizontal plate; 3. cylinder; 4. inner tube; 5. condenser tube; 6. isolation ring; 7. connecting tube; 8. air inlet pipe; 9. liquid delivery pipe; 10. reflux pipe; 11. collecting pipe; 12. conduit; 13. annular shell; 14. overflow pipe; 15. branch pipe; 16. vertical pipe; 17. one-way valve; 18. partition; 19. adsorption layer. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-5As shown, a volatile raw material recovery device for PVDF coating production includes a condensation box 1, a horizontal plate 2 is installed in the condensation box 1, and the horizontal plate 2 divides the condensation box 1 into an upper cavity and a lower cavity, and a plurality of evenly distributed cylinders 3 are installed in the upper cavity, an inner tube 4 is provided at the center of the cylinder 3, a condensation zone is formed between the inner tube 4 and the cylinder 3, a spiral condensation tube 5 is installed in the condensation zone, and a plurality of isolation rings 6 are installed in the condensation zone, and the plurality of isolation rings 6 divide the condensation zone into a plurality of heat exchange chambers, an air inlet pipe 8 is penetrated through the side wall of the condensation box 1 near the top, so as to facilitate the introduction of volatile raw materials, and the air inlet pipe 8 is connected with the corresponding condensation tube 5, and a connecting pipe 7 is installed between the ends of two adjacent condensation tubes 5.

[0023] A liquid delivery pipe 9 for delivering cold medium is provided above the condenser 1. A liquid supply assembly is installed between the liquid delivery pipe 9 and the heat exchange cavity. The liquid supply assembly includes a branch pipe 15 located at the center of the inner tube 4. The bottom end of the branch pipe 15 is a sealed structure, and the top end of the branch pipe 15 is connected to the liquid delivery pipe 9. A liquid outlet connected to the heat exchange cavity is installed on the wall of the branch pipe 15, which is convenient for introducing the refrigerated medium into multiple heat exchange cavities respectively. A reflux pipe 10 and a collecting pipe 11 are provided in the lower cavity;

[0024] A reflux assembly is installed between the reflux pipe 10 and the heat exchange chamber. The reflux assembly includes a plurality of vertical pipes 16 connected to the top of the reflux pipe 10. The top of the vertical pipe 16 passes through the horizontal plate 2 and is connected to the upper surface of the inside of the condenser 1. A drain port connected to the top side wall of the heat exchange chamber is installed on the side wall of the vertical pipe 16, so that the medium after heat exchange in the heat exchange chamber can be discharged through the reflux pipe 10, and the medium can be circulated and cooled in cooperation with external refrigeration equipment.

[0025] An overflow assembly is installed between the collecting tube 11 and the condensing tube 5. The overflow assembly includes a conduit 12 connected to the bottom of the condensing tube 5, which is convenient for discharging the volatile raw materials after liquefaction. The conduit 12 extends downward through the horizontal plate 2, and an annular shell 13 is mounted near the bottom of the conduit 12. In this embodiment, the volume of the annular shell 13 is relatively small, which is convenient for the raw materials to be liquefied and quickly fill the annular shell 13, so that the volatile raw materials are not easily discharged through the conduit 12. A "7"-shaped overflow pipe 14 is connected to the side wall of the annular shell 13 near the top, and the bottom end of the overflow pipe 14 is connected to the collecting tube 11. A liquid outlet pipe is connected between the bottom of the annular shell 13 and the top of the collecting tube 11, and a one-way valve 17 is installed on the liquid outlet pipe. Opening the one-way valve 17 facilitates the discharge of the liquefied raw materials retained in the annular shell 13.

[0026] A partition 18 is symmetrically installed between the cylinder 3 away from the air inlet pipe 8 and the wall of the condensation box 1, and an adsorption chamber is formed between the partition 18 and the end of the condensation box 1. A plurality of adsorption layers 19 are installed in the adsorption chamber. An exhaust pipe is connected between the condensation pipe 5 away from the air inlet pipe 8 and the adsorption chamber to facilitate adsorption treatment. It ensures that even if a small amount of volatile raw materials are condensed and liquefied, they can be subjected to multi-stage adsorption treatment by the plurality of adsorption layers 19 in the adsorption chamber to avoid direct discharge and environmental pollution, and a pressure relief port is installed on the side wall near the top of the adsorption chamber.

[0027] The working principle of the utility model is as follows: first, the cold medium after being cooled to a suitable temperature is introduced into multiple branch pipes 15 by using a liquid delivery pipe 9, and the cold medium can be respectively transported to multiple heat exchange chambers through multiple liquid outlets to ensure that there is no large temperature difference between the cold media in each heat exchange chamber, and then the volatile raw materials generated in the production process of PVDF coatings are introduced into the corresponding condenser tube 5 by using an air inlet pipe 8, and the volatile raw materials are coordinated with the connecting pipe 7 so that the volatile raw materials can flow through multiple spiral condenser tubes 5 in sequence, thereby extending the flow path of the volatile raw materials and achieving full condensation. After the volatile raw materials are condensed and liquefied, they flow into the annular shell 13 through the conduit 12, and then flow into the collection pipe 11 through the overflow pipe 14 for centralized discharge and collection, thereby realizing raw material recovery. After the medium in the heat exchange chamber is full, as the medium is continuously transported, the medium after heat exchange will enter the vertical pipe 16 through the discharge port, and finally be discharged from the reflux pipe 10.

[0028] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A volatile raw material recovery device for PVDF coating production, comprising a condensation box (1), characterized in that: A transverse plate (2) is installed in the condensing box (1), and the transverse plate (2) divides the condensing box (1) into an upper cavity and a lower cavity, and a plurality of evenly distributed cylinders (3) are installed in the upper cavity, an inner tube (4) is provided at the center of the cylinder (3), a condensation zone is formed between the inner tube (4) and the cylinder (3), a spiral condensing tube (5) is installed in the condensing zone, and a plurality of isolation rings (6) are installed in the condensing zone, and the plurality of isolation rings (6) divide the condensing zone into a plurality of heat exchange cavities, and a heat exchange ring (6) is installed between the ends of two adjacent condensing tubes (5). A connecting pipe (7) is provided, an air inlet pipe (8) is provided through the side wall of the condenser (1) near the top, and the air inlet pipe (8) is connected to the corresponding condenser (5), a liquid delivery pipe (9) for delivering cold medium is provided above the condenser (1), a liquid supply component is installed between the liquid delivery pipe (9) and the heat exchange chamber, a return pipe (10) and a collecting pipe (11) are provided in the lower chamber, a return component is installed between the return pipe (10) and the heat exchange chamber, and an overflow component is installed between the collecting pipe (11) and the condenser (5).

2. The volatile raw material recovery equipment for PVDF coating production according to claim 1, characterized in that: The overflow assembly comprises a conduit (12) connected to the bottom of the condenser tube (5), the conduit (12) penetrates the horizontal plate (2) and extends downward, and an annular shell (13) is mounted on the conduit (12) near the bottom end, and a "7"-shaped overflow pipe (14) is connected to the side wall of the annular shell (13) near the top end, and the bottom end of the overflow pipe (14) is connected to the collecting pipe (11).

3. The volatile raw material recovery equipment for PVDF coating production according to claim 1, characterized in that: The liquid supply assembly comprises a branch pipe (15) located at the center of the inner pipe (4); the bottom end of the branch pipe (15) is a sealed structure, and the top end of the branch pipe (15) is connected to the liquid delivery pipe (9); and a liquid outlet connected to the heat exchange chamber is installed on the tube wall of the branch pipe (15).

4. The volatile raw material recovery equipment for PVDF coating production according to claim 1, characterized in that: The reflux assembly comprises a plurality of vertical pipes (16) connected to the top of the reflux pipe (10); the top ends of the vertical pipes (16) penetrate the transverse plate (2) and are connected to the upper surface of the interior of the condensation box (1); and the side walls of the vertical pipes (16) are provided with drainage ports connected to the top side walls of the heat exchange chamber.

5. The volatile raw material recovery equipment for PVDF coating production according to claim 2, characterized in that: A liquid outlet pipe is connected between the bottom of the annular shell (13) and the top of the collecting pipe (11), and a one-way valve (17) is installed on the liquid outlet pipe.

6. A volatile raw material recovery device for PVDF coating production according to claim 1, characterized in that A partition (18) is symmetrically installed between the cylinder (3) away from the air inlet pipe (8) and the wall of the condensation box (1), an adsorption chamber is formed between the partition (18) and the end of the condensation box (1), and a plurality of adsorption layers (19) are installed in the adsorption chamber. An exhaust pipe is connected between the condensation pipe (5) away from the air inlet pipe (8) and the adsorption chamber, and a pressure relief port is installed on the side wall of the adsorption chamber near the top.

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