Foaming kettle with external high-pressure gas circulating pump for pushing supercritical fluid to circularly flow

Abstract

The utility model discloses a foaming kettle with an external high-pressure gas circulating pump for pushing supercritical fluid to circularly flow, which relates to the technical field of high polymer supercritical fluid foaming, and adopts the technical scheme that the foaming kettle comprises a foaming kettle body, a pipeline is arranged on the side wall of the foaming kettle body, two ends of the pipeline are respectively connected with two end parts of the foaming kettle, one end of the pipeline is an inlet end, and the other end of the pipeline is an outlet end. The other end is an outlet end; the two ends of the pipeline are each provided with a safety valve, a circulating pump is further arranged on the pipeline and located between the two safety valves, an electric heater is arranged between the safety valve close to the outlet end of the pipeline and the circulating pump, and a temperature sensor is arranged between the electric heater and the circulating pump. The foaming kettle has the beneficial effects that fluid in the kettle is pushed by the circulating pump to quickly flow, so that the heat transfer effect is greatly enhanced, and the time for achieving heat balance in the foaming kettle is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer supercritical fluid foaming, in particular to a foaming kettle in which an external high-pressure gas circulation pump drives a supercritical fluid to circulate. Background Art

[0002] Foaming technology is a technology widely used in the manufacturing process to prepare foam materials with specific physical properties. Foaming technology is widely used in various fields. In the construction and insulation industry, foaming materials are used for heat insulation and sound absorption; in the automotive industry, foaming materials are used to reduce weight and provide cushioning protection; in the packaging industry, foaming materials are used to package and protect fragile items; in the electronics industry, foaming materials are used for thermal management and protection of electronic components; therefore, foaming technology is increasingly receiving attention from researchers and industrialists.

[0003] The current foaming technology mainly includes kettle foaming and extrusion foaming. Both have their own advantages, especially kettle foaming, which is widely used because of its simple process and wide adaptability to materials. However, the kettle supercritical fluid foaming technology has the defect of uneven heating of the built-in materials, which will lead to the problem of uneven foaming properties of the final formed foam. For liquid foam and particle foaming, the existing technology can solve this problem by setting an agitator in the kettle. But for the foaming of plates, there has been no good way to solve the problems of slow heat conduction and uneven heating of materials. Utility Model Content

[0004] In view of the above technical problems, the utility model provides a foaming kettle in which an external high-pressure gas circulation pump drives a supercritical fluid to circulate.

[0005] The technical solution comprises a foaming kettle body, a pipe is arranged on the side wall of the foaming kettle body, two ends of the pipe are respectively connected to two ends of the foaming kettle, one end of the pipe is an inlet end, and the other end is an outlet end;

[0006] A safety valve is respectively arranged at both ends of the pipeline, and a circulation pump is also arranged on the pipeline. The circulation pump is located between the two safety valves, an electric heater is arranged between the safety valve near the outlet end of the pipeline and the circulation pump, and a temperature sensor is arranged between the electric heater and the circulation pump.

[0007] Preferably, the electric heater comprises a mounting clamp fixedly arranged on the pipeline, a plurality of heating tubes are arranged on the mounting clamp, and the heating tubes are circumferentially arrayed on the outside of the pipeline.

[0008] Preferably, the mounting clamp comprises two semicircular arc-shaped clamping plates arranged opposite to each other, each of the clamping plates is provided with a folded edge at both ends of the open end, each of the folded edges has a mounting hole passing through it, and the two clamping plates are fixedly connected by bolts passing through the mounting holes.

[0009] Preferably, an arc-shaped adapter block is fixedly arranged on the arc-shaped portion of each clamping plate, and the heating tube is fixedly arranged on the adapter block.

[0010] Preferably, the outer side of the electric heater is covered with a thermal insulation layer.

[0011] The beneficial effect of the technical solution provided by the embodiment of the utility model is: the rapid flow of the fluid in the kettle is promoted by the circulation pump, which greatly enhances the heat transfer effect and shortens the time to reach thermal equilibrium in the foaming kettle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0013] Figure 2 This is a schematic diagram of the structure of an electric heater according to an embodiment of the utility model.

[0014] Figure 3 This is a schematic diagram of the installation clamp structure of an embodiment of the utility model.

[0015] Among them, the figure markings are: 1. foaming kettle body; 2. pipeline; 3. valve; 4. circulation pump; 5. electric heater; 6. temperature sensor; 7. mounting clamp; 8. heating tube; 9. clamp; 10. folded edge; 11. bolt; 12. adapter block. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0018] In the description of the invention of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention of the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention of the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the invention of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of the utility model can be understood according to specific circumstances.

[0020] Example 1

[0021] See also Figures 1 to 3 The utility model provides a foaming kettle with an external high-pressure gas circulation pump driving the circulation of supercritical fluid, comprising a foaming kettle body 1, a pipe 2 is arranged on the side wall of the foaming kettle body 1, two ends of the pipe 2 are respectively connected to two ends of the foaming kettle, one end of the pipe 2 is an inlet end, and the other end is an outlet end;

[0022] Furthermore, the horizontal height of the inlet end of the pipe 2 is lower than the horizontal height of the outlet end, and correspondingly, the air is inletted at a high position and exhausted at a low position of the foaming kettle body 1;

[0023] A safety valve is respectively arranged at both ends of the pipeline 2. The safety valve is a valve 3 that is operated manually, electrically, hydraulically or pneumatically, including but not limited to a gate valve, a ball valve, a stop valve, a butterfly valve, a plug valve, etc. A circulating pump 4 is also arranged on the pipeline 2. The circulating pump 4 refers to a vacuum pump used for gas circulation, and has an inlet and an outlet suction nozzle and an exhaust nozzle, and can continuously form a vacuum or negative pressure at the inlet; a slight positive pressure is formed at the exhaust nozzle; the working medium is mainly gas, and it is a small instrument mainly used for gas circulation. The circulating pump 4 can make the gas in the foaming kettle realize gas circulation; the circulating pump 4 is located between the two safety valves, and an electric heater 5 is arranged between a safety valve near the outlet end of the pipeline 2 and the circulating pump 4, and a temperature sensor 6 is arranged between the electric heater 5 and the circulating pump 4.

[0024] Furthermore, a controller is provided on one side of the foaming kettle body 1, and the controller can control the electric heater 5. When the temperature sensor 4 detects that the gas temperature in the pipeline 2 is lower than a preset value, the controller controls the electric heater 5 to operate and heat the pipeline 2 to replenish the lost heat.

[0025] The foaming kettle body, the safety valve, the circulation pump and the safety valve are connected in sequence through pipelines to form a closed passage for gas circulation.

[0026] The electric heater 5 includes a mounting clamp 7 fixedly mounted on the pipeline 2 , on which a plurality of heating tubes 8 are mounted. The heating tubes 8 are arranged in a circumferential array on the outside of the pipeline 2 .

[0027] The heating tube 8 is formed by installing an electric heating wire in a seamless metal tube (carbon steel tube, titanium tube, stainless steel tube, copper tube), filling the gap with magnesium oxide powder with good thermal conductivity and insulation, and then shrinking the tube, and then processing it into various shapes required by users. The heating tube 8 used in this scheme is U-shaped, which has the characteristics of small size, high power, fast thermal response, high temperature control accuracy, and high comprehensive thermal efficiency.

[0028] The mounting clamp 7 includes two oppositely disposed semicircular arc-shaped clamping plates 9, each of which has a folded edge 10 at both ends of the open end, each folded edge 10 having a mounting hole extending therethrough, and the two clamping plates 9 are fixedly connected by bolts 11 extending through the mounting holes.

[0029] An arc-shaped adapter block 12 is fixedly arranged on the arc-shaped portion of each clamping plate 9 , and the heating tube 8 is fixedly arranged on the adapter block 12 .

[0030] The outer side of the electric heater 5 is covered with an insulation layer, and the insulation layer is made of rock wool, polyurethane, etc. to reduce heat loss;

[0031] Furthermore, a heat-conducting material is filled between the insulation layer and the pipeline 2. The heat-conducting material is preferably metal particles, which have the advantages of good heat conduction effect and low cost.

[0032] When the utility model is used, the material to be foamed is placed in the foaming kettle body 1, and the kettle cover is closed before heating, the temperature is raised to a set value, and the temperature is kept warm, and then a foaming agent (the foaming agent refers to carbon dioxide or nitrogen) is filled into the foaming kettle body 1, and the air pressure in the foaming kettle body 1 is raised to a set value, and the pressure is maintained after the air supply is stopped.

[0033] Subsequently, the circulation pump 4 is started to promote the circulation of the fluid in the foaming kettle body 1, which can greatly accelerate the temperature rise rate in the foaming kettle body 1. The energy dissipated in this process is measured by the temperature sensor 5, and the electric heater 6 is used to control the heat compensation of the pipeline 2 until the insulation and pressure maintenance process of the foaming material is completed.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A foaming kettle in which an external high-pressure gas circulation pump drives a supercritical fluid to circulate, comprising a foaming kettle body (1), characterized in that: A pipe (2) is arranged on the side wall of the foaming kettle body (1), and the two ends of the pipe (2) are respectively connected to the two ends of the foaming kettle body (1), one end of the pipe (2) is an inlet end, and the other end is an outlet end; A safety valve is provided at each end of the pipeline (2). A circulation pump (4) is also provided on the pipeline (2). The circulation pump (4) is located between the two safety valves. An electric heater (5) is provided between the safety valve close to the outlet end of the pipeline (2) and the circulation pump (4). A temperature sensor (6) is provided between the electric heater (5) and the circulation pump (4).

2. The foaming kettle according to claim 1, wherein the external high-pressure gas circulation pump drives the supercritical fluid to circulate, The electric heater (5) comprises a mounting clamp (7) fixedly arranged on the pipeline (2), a plurality of heating tubes (8) being arranged on the mounting clamp (7), and the heating tubes (8) are arranged in a circumferential array on the outside of the pipeline (2).

3. The foaming kettle according to claim 2, wherein the external high-pressure gas circulation pump drives the supercritical fluid to circulate, The mounting clamp (7) comprises two semicircular arc-shaped clamping plates (9) arranged opposite to each other, each of the two ends of the opening of the clamping plate (9) being provided with a folded edge (10), each of the folded edges (10) being provided with a through mounting hole, and the two clamping plates (9) being fixedly connected by bolts (11) passing through the mounting holes.

4. The foaming kettle according to claim 3, wherein the external high-pressure gas circulation pump drives the supercritical fluid to circulate, An arc-shaped adapter block (12) is fixedly arranged on the arc-shaped portion of each clamping plate (9), and the heating tube (8) is fixedly arranged on the adapter block (12).

5. The foaming kettle according to claim 4, wherein the external high-pressure gas circulation pump drives the supercritical fluid to circulate, The outer side of the electric heater (5) is coated with a thermal insulation layer.

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