Sizing sleeve for PFA (Polyfluoroalkoxy) pipe

Abstract

The utility model discloses a PFA (Polyfluoroalkoxy) pipe sizing sleeve, which relates to the technical field of pipe sizing sleeves and comprises an inner ring sleeve, an outer ring sleeve and a flange plate, the outer ring sleeve is sleeved on the outer side of the inner ring sleeve, a plurality of cover plate gasket bulges are arranged on the inner ring sleeve, the flange plate is fixed on the outer ring sleeve, and the cover plate gasket bulges are arranged on the flange plate. The inner ring sleeve and the outer ring sleeve are matched in a sleeved mode, three cavities are formed between the inner ring sleeve and the outer ring sleeve, and the three cavities are the first cavity, the second cavity and the third cavity respectively when the inner ring sleeve and the outer ring sleeve are matched in use, the three cavities are formed between the inner ring sleeve and the outer ring sleeve and act on pre-cooling and forming respectively, and therefore the inner ring sleeve and the outer ring sleeve are matched in use. The sizing sleeve has the advantages that starting waste products are few, the production process is stable, and abnormal problems such as ripples and water ripples do not exist, PFA pipes manufactured through the sizing sleeve machined through the sizing sleeve machining device are few in starting waste products and stable in production process, and ripples and water ripples do not exist in the PFA pipes manufactured through the sizing sleeve machining device.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe sizing sleeves, in particular to a PFA pipe sizing sleeve. Background Art

[0002] PFA is a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether. Through melt extrusion, injection molding, molding and other processing techniques, PFA pipes, films, plates, tees, flanges and other products can be produced. This type of product is transparent or translucent and has all the excellent properties of polytetrafluoroethylene. After years of development, product specifications have been serialized and are widely used in electronics, chemical industry, environmental protection and sealing manufacturing industries.

[0003] The PFA pipe molding process adopts melt extrusion molding. When the melt index of the PFA product is less than 3.0g / 10min, large-sized PFA pipes can be processed by extrusion molding. Due to the high melt viscosity of the PFA product, it has a high stretch ratio during extrusion molding, and a smooth extrudate can be obtained quickly. The processing temperature and crystallization temperature of PFA melt extrusion are relatively high. The use of conventional calibrating sleeves to produce large-sized PFA pipes often results in problems such as outer wall corrugations, severe watermarks, many startup wastes, and high costs. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] The present application discloses a PFA pipe sizing sleeve, which is mainly aimed at the technical problems that the existing PFA melt extrusion processing temperature and crystallization temperature are both relatively high, and the conventional sizing sleeve is used to produce large-sized PFA pipes, which often results in outer wall corrugations, water marks, a large number of waste products during startup, unstable production process and high cost.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the technical solution provided by the utility model is:

[0008] The utility model discloses a PFA pipe sizing sleeve, comprising an inner ring sleeve, an outer ring sleeve and a flange plate, wherein the outer ring sleeve is arranged outside the inner ring sleeve, a plurality of cover plate gasket protrusions are arranged on the inner ring sleeve, and the flange plate is fixed on the outer ring sleeve.

[0009] Furthermore, the cover plate gasket protrusion on the inner ring sleeve forms three cavities when the inner ring sleeve and the outer ring sleeve are fitted together, namely the first cavity, the second cavity and the third cavity.

[0010] Furthermore, a plurality of vacuum connection holes are provided on the flange plate from the inside to the outside, and a flange plate coolant inlet and a flange plate coolant outlet are symmetrically provided on the outside of the flange plate.

[0011] Furthermore, an annular groove for installing a sealing rubber ring is provided in the cover plate gasket protrusion, and a sealing rubber ring is sleeved in the annular groove.

[0012] Furthermore, the first chamber is a pre-cooling chamber, and an external first cooling liquid inlet is provided below the outer ring sleeve where the first chamber is located, and an external first cooling liquid outlet is provided above the outer ring sleeve where the first chamber is located.

[0013] Furthermore, the second chamber is a vacuum chamber, a plurality of vacuum holes are arranged on the outer ring where the second chamber is located, pipes for connection are arranged between the vacuum holes and the vacuum connecting holes on the flange plate, and the vacuum holes correspond to the vacuum connecting holes.

[0014] Furthermore, the third chamber is a cooling chamber, a second coolant inlet is provided below the outer ring where the third chamber is located, the second coolant inlet is connected to the coolant inlet of the flange plate through a pipe, a second coolant outlet is provided above the outer ring where the third chamber is located, the second coolant outlet is connected to the coolant outlet of the flange plate through a pipe.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0017] The utility model forms three hollow chambers between the inner ring sleeve and the outer ring sleeve by using the inner replacement sleeve in combination with the outer ring sleeve, which respectively act on pre-cooling, molding and complete cooling, thereby providing a sizing sleeve with less startup waste, stable production process and no abnormal problems such as ripples and water marks. The sizing sleeve processed by the utility model can produce PFA pipes with less startup waste, no ripples or water marks and a stable production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0019] Figure 2 for Figure 1 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0020] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present 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 present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0022] Example

[0023] Combined with Figure 1-2 The PFA pipe sizing sleeve comprises an inner ring sleeve 01, an outer ring sleeve 02, a rubber sealing ring and a flange plate 03. The outer ring sleeve 02 is sleeved on the outside of the inner ring sleeve 01. The inner ring sleeve 01 is provided with a plurality of cover plate gasket protrusions 04. The flange plate 03 is fixed on the outer ring sleeve 02.

[0024] The cover gasket protrusion 04 is provided with an annular groove 41 for installing a sealing rubber ring 42, and a sealing rubber ring 42 is sleeved in the annular groove 41. The sealing rubber ring 42 can be made of rubber, silicone, fluororubber and other materials, preferably fluororubber. After the outer ring sleeve 02 is sleeved on the inner ring sleeve 01, it is sealed by the sealing rubber ring 42.

[0025] The cover gasket protrusion 04 on the inner ring sleeve 01 forms three cavities when the inner ring sleeve 01 and the outer ring sleeve 02 are fitted together, namely the first chamber 05, the second chamber 06, and the third chamber 07. The three cavities formed are isolated from each other by the cover gasket protrusion 04, and the sealing rubber ring 42 has a good sealing effect. The first chamber 05 is a pre-cooling chamber, which is used to cool the molten material to the crystallization temperature of molding. The second chamber 06 is a vacuum chamber for processing and molding. The third chamber 07 is a cooling chamber, which is used for the final cooling of the formed pipe.

[0026] The flange plate 03 is provided with a plurality of vacuum connection holes 08 from the inside to the outside, and the flange plate 03 is symmetrically provided with a flange plate coolant inlet 09 and a flange plate coolant outlet 10 on the outside. The flange plate 03 is preferably fixed to the vacuum box by bolts, and the flange plate 03 is provided with holes for installing bolts. The flange plate 03 is connected to the outer ring sleeve 02 by threads, and the position is the partition between the first chamber 05 and the second chamber 06.

[0027] An external first coolant inlet 11 is provided below the outer ring sleeve 02 where the first chamber 05 is located, and an external first coolant outlet 12 is provided above the outer ring sleeve 02 where the first chamber 05 is located. The first chamber 05 is a pre-cooling chamber, and coolant flows inside. The coolant can be selected as cooling oil or water, which can be changed according to cooling needs. The temperature of the first chamber 05 is controlled by adjusting the flow rate of the coolant in the first chamber 05 through a flowmeter, so that the pipe is pre-cooled to the crystallization temperature.

[0028] The second chamber 06 is a vacuum chamber, which is evacuated internally and plays a shaping role in the tube extrusion process. A plurality of vacuum holes 13 are provided on the outer ring where the second chamber 06 is located. A pipe for connection is provided between the vacuum holes 13 and the vacuum connecting holes 08 on the flange plate 03. The vacuum holes 13 correspond to the vacuum connecting holes 08.

[0029] The third chamber 07 is a cooling chamber. A second coolant outlet 15 is provided above the outer ring where the third chamber 07 is located. The second coolant outlet 15 is connected to the coolant outlet 10 of the flange plate through a pipeline. A second coolant inlet 14 is provided below the outer ring where the third chamber 07 is located. The second coolant inlet 14 is connected to the coolant inlet of the flange plate 03 through a pipeline. The third chamber 07 plays a role of complete cooling.

[0030] The outer ring sleeve 02 is preferably made of stainless steel, the inner ring sleeve 01 is made of copper, aluminum or stainless steel, etc., and the pipe material used for connection is a stainless steel braided hose.

[0031] The general embodiments are:

[0032] The sizing sleeve is composed of an inner ring sleeve 01, an outer ring sleeve 02, a sealing rubber ring 42, a flange plate 03 and a pipe.

[0033] The outer ring sleeve 02 is made of stainless steel, and is sleeved outside the inner ring sleeve 01. The inner ring sleeve 01 is made of copper. The outer ring sleeve 02 and the inner ring sleeve 01 are sealed by a sealing rubber ring 42 to form a first chamber 05, a second chamber 06, and a third chamber 07. The sealing rubber ring 42 is made of fluorine rubber.

[0034] The first chamber 05 is a cooling chamber, in which a coolant is passed, and the coolant is water. A first cooling water inlet 11 is provided below the outer ring sleeve 02 of the first chamber 05, and a first cooling water outlet 12 is provided above the outer ring sleeve 02 of the first chamber 05. The temperature of the first chamber 05 as a pre-cooling chamber is controlled by adjusting the flow rate of the cooling water through a flowmeter, so that the pipe is pre-cooled to the crystallization temperature; the second chamber 06 is a vacuum chamber, and a vacuum is drawn inside, which plays a shaping role in the pipe extrusion process. There are 4 vacuum holes 13 on the outer ring sleeve 02 of the second chamber 06, and 4 vacuum connecting holes 08 are provided on the flange plate 03 from the inside to the outside. The flange plate 03 is symmetrically provided with a flange plate coolant inlet 09 and a flange plate coolant outlet 10 on the outside.

[0035] The four vacuum holes 13 are connected to the corresponding four vacuum connection holes 08 on the flange plate 03 through pipes respectively; the third chamber 07 is a cooling chamber, and a coolant passes through the interior. The coolant is water, which plays a cooling and shaping role in the pipe extrusion process. A second coolant outlet 15 is provided above the outer ring where the third chamber 07 is located, and the second coolant outlet 15 is connected to the flange plate coolant outlet 10 through a pipe. A second coolant inlet 14 is provided below the outer ring where the third chamber 07 is located, and the second coolant inlet 14 is connected to the flange plate coolant inlet 09 through a pipe; the pipe material is a stainless steel braided hose; the flange plate 03 is connected to the outer ring sleeve 02 by threads, and the position is the partition between the first chamber 05 and the second chamber 06.

[0036] There are 8 through holes on the flange plate 03, which can be fixed on the vacuum box by bolts. The extruded tube blank can be quickly formed through the sizing sleeve, the finished product is stable, and the amount of waste during startup is reduced.

[0037] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A PFA pipe sizing sleeve, characterized in that: The invention comprises an inner ring sleeve (01), an outer ring sleeve (02), and a flange plate (03); the outer ring sleeve (02) is sleeved on the outer side of the inner ring sleeve (01); the inner ring sleeve (01) is provided with a plurality of cover plate gasket protrusions (04); the flange plate (03) is fixed on the outer ring sleeve (02); when the inner ring sleeve (01) and the outer ring sleeve (02) are sleeved together, the cover plate gasket protrusions (04) on the inner ring sleeve (01) form three cavities, namely a first chamber (05), a second chamber (06), and a third chamber (07).

2. A PFA pipe sizing sleeve according to claim 1, characterized in that: The flange plate (03) is provided with a plurality of vacuum connection holes (08) from the inside to the outside, and the flange plate (03) is symmetrically provided with a flange plate coolant inlet (09) and a flange plate coolant outlet (10) on the outside.

3. A PFA pipe sizing sleeve according to claim 1, characterized in that: An annular groove (41) for installing a sealing rubber ring (42) is provided in the cover plate gasket protrusion (04), and the sealing rubber ring (42) is sleeved in the annular groove (41).

4. A PFA pipe sizing sleeve according to claim 1, characterized in that: The first chamber (05) is a pre-cooling chamber, and an external first cooling liquid inlet (11) is provided below the outer ring sleeve (02) where the first chamber (05) is located, and an external first cooling liquid outlet (12) is provided above the outer ring sleeve (02) where the first chamber (05) is located.

5. A PFA pipe sizing sleeve according to claim 2, characterized in that: The second chamber (06) is a vacuum chamber. A plurality of vacuum holes (13) are provided on the outer ring where the second chamber (06) is located. Pipes for connection are provided between the vacuum holes (13) and the vacuum connection holes (08) on the flange plate (03). The vacuum holes (13) correspond to the vacuum connection holes (08).

6. A PFA pipe sizing sleeve according to claim 2, characterized in that: The third chamber is a cooling chamber. A second coolant inlet (14) is provided below the outer ring where the third chamber (07) is located. The second coolant inlet (14) is connected to the flange plate coolant inlet (09) through a pipeline. A second coolant outlet (15) is provided above the outer ring where the third chamber (07) is located. The second coolant outlet (15) is connected to the flange plate coolant outlet (10) through a pipeline.

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