Water circulation control system for water ring process

Abstract

The utility model provides a water circulation control system for a water ring process, relates to the technical field of plastic film preparation, and solves the technical problems of waste and pollution caused by the fact that an existing water cooling system for the water ring process has higher requirements on the quality of cooling water and is not recycled. The water ring cooling device comprises a cold water tank used for providing cooling water and a cooling pipe communicated with the cold water tank and used for cooling a water ring, and the cold water tank is further sequentially communicated with a first-stage filtering system used for preliminarily filtering impurities, a sterilization system used for sterilization and a second-stage filtering system used for secondarily filtering the impurities. The cold water tank is further communicated with a recycling pipe used for recycling circulating cooling water. Cooling water is stored in the middle water tank temporarily after effective sterilization and impurity removal, water rings and membrane-shaped ring bubbles are cooled, the membrane surface is ensured to be attractive, and bacterium breeding and wrinkling on the membrane surface are prevented; and ultraviolet sterilization is adopted, so that the temperature of cooling water is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic film preparation, in particular to a water circulation control system for a water ring process. Background Art

[0002] Ring film blowing is a method of using an extruder to form a film through a ring die by using a blown film process. At present, in the field of film production, the main film forming methods include cast film method and ring film blowing method.

[0003] Casting method is mainly used to process polypropylene. The advantages of this method are: good film flatness and good optical properties. The disadvantages are: high equipment cost, high product cost, difficult opening, large friction coefficient, etc. This is the reason why it has not been widely used in the production process of composite polyethylene film in my country. Casting polyethylene film is rarely processed by this method because of its poor opening, insufficient stiffness, easy generation of crystal points, and inability to meet the requirements of water boiling and sterilization resistance; the production process of ring film blowing method is mainly divided into two cooling forms: upper blowing air cooling and lower blowing water cooling: upper blowing air cooling method is a method of forming polyolefins through extruders, ring die heads, extrusion, and air cooling. It is mainly used to process polyethylene. Polypropylene cannot be processed by this method because of its slow crystallization rate and fast shear thinning. Its advantages are: easy film forming and low cost, but its disadvantages are: slow cooling and poor film optical properties.

[0004] The basic components of the downward blowing water cooling type are the same as those of the upward blowing type, except that the downward blowing uses circulating cooling water as the cooling medium. During the production process, the high-temperature annular film bubble is formed by the extrusion of the molten material. The annular film bubble continues to move downward, and the cooling water is used to cool the surface of the annular film bubble. Then the cooling water passes through the herringbone plate and enters the water accumulation tray below.

[0005] For example, the multi-layer co-extruded polyethylene film processed by the bottom-blowing water-cooled ring film method proposed in the patent with publication number CN101927590A adopts the traditional water cooling method. Because the cooling water directly contacts the ring-shaped film bubble, the water quality requirements are relatively high, and the impurity content and bacteria content cannot exceed the standard, otherwise it will cause wrinkles on the film surface, bacterial growth and other problems. Therefore, after cooling, the cooling water is discharged to the municipal pipe network without recycling, resulting in material waste and certain pollution. Utility Model Content

[0006] The utility model aims to provide a water circulation control system for a water ring process, so as to solve the technical problems that the existing water ring process water cooling system has high requirements on the quality of cooling water and does not circulate and reuse the water, resulting in waste and pollution.

[0007] The embodiments of the present invention are implemented by the following technical solutions:

[0008] A water circulation control system for a water ring process includes a cold water tank for providing cooling water and a cooling pipe connected to the cold water tank for cooling the water ring. The cold water tank is also connected in sequence to a primary filtration system for preliminary filtration of impurities, a sterilization system for sterilization, and a secondary filtration system for secondary filtration of impurities. The cold water tank is also connected to a recovery pipe for recovering circulating cooling water.

[0009] Preferably, the secondary filtering system includes a plurality of groups of multi-stage filtering devices connected in parallel, and the multi-stage filtering devices include a plurality of groups of secondary filters with successively increasing flow accuracy.

[0010] Preferably, the sterilization system comprises a flow-through ultraviolet sterilizer; the primary filtration system comprises two sets of primary filters connected in parallel; and the secondary filter comprises a secondary filter, a tertiary filter and a quaternary filter connected in series.

[0011] Preferably, the cold water tank is also connected to a chiller for producing cold water, the chiller includes an evaporator for preliminary refrigeration, a condenser for further refrigeration, a compressor for compressing and transporting cooling water, and a dry filter for filtering impurities, and the evaporator inlet is connected to the recovery pipe.

[0012] Preferably, the compressor is connected to the evaporator outlet and the condenser inlet, and the filter dryer is connected to the condenser outlet and the evaporator inlet.

[0013] Preferably, the water ring is provided with a membrane tube embryo for draining cooling water, a water ring support plate and a herringbone plate, a collecting box for collecting cooling water, and a water ring vacuum pump connected to the recovery pipe for pumping back the cooling water.

[0014] Preferably, the water ring vacuum pump is connected to the collecting tank via a lifting pipe.

[0015] Preferably, it also includes an intermediate water tank for buffering and temporarily storing cooling water, and the intermediate water tank is connected to the secondary filtration system and the cooling pipe.

[0016] Preferably, the intermediate water tank and the cold water tank are also connected to each other and are provided with a sewage pipe for discharging sewage.

[0017] Preferably, both the primary filtration system and the secondary filtration system are provided with diaphragm valves for controlling cooling water.

[0018] By adopting this technical solution, the cooling water can be preliminarily filtered of impurities and large-aperture impurities through the primary filtration system, and then the cooling water is sterilized through the sterilization system, and ultraviolet sterilization is adopted, which will not affect the temperature of the cooling water. After sterilization, the cooling water is filtered again with higher flow accuracy, and some fine agglomerates that still exist after sterilization are effectively sterilized and impurities are temporarily stored in the intermediate water tank; the intermediate water tank passes the temporarily stored cooling water into the cooling pipe to cool the water ring and the annular membrane bubble. After cooling, the cooling water flows into the collecting box along the human-shaped plate, and the collected cooling water is reused through the lifting pipe and the water ring vacuum pump;

[0019] After the recycled cooling water is cooled by the evaporator and condenser, it passes through a drying filter to prevent air moisture and impurities from entering the circulating cooling water. The cooled cooling water is added to the cold water tank for standby use.

[0020] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0021] 1. The cooling water of the utility model is effectively sterilized and impurity-free and then temporarily stored in the intermediate water tank to cool the water ring and membrane-shaped ring bubble, ensuring the beauty of the membrane surface and preventing bacteria from growing on the membrane surface and wrinkles;

[0022] 2. The utility model adopts ultraviolet sterilization, which will not affect the temperature of cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a water circulation control system for a water ring process provided in Example 1 of the utility model;

[0025] Figure 2 A schematic diagram of the structure of a chiller for a water circulation control system for a water ring process provided in Example 2 of the utility model;

[0026] Icons: 1. Cold water tank; 11. Drain pipe; 21. Primary filter; 3. Flow-through UV sterilizer; 4. Diaphragm valve; 5. Intermediate water tank; 51. Secondary filter; 52. Third-stage filter; 53. Fourth-stage filter; 6. Water ring; 61. Water ring support plate; 62. Water ring vacuum pump; 63. Lifting pipe; 64. Cooling pipe; 7. Membrane tube embryo; 71. Herringbone plate; 72. Collecting box; 81. Compressor; 82. Condenser; 83. Dry filter; 84. Evaporator; 9. Recovery pipe. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 invention.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 present invention can be understood according to specific circumstances.

[0032] Example 1

[0033] A water circulation control system for a water ring process includes a cold water tank 1 for providing cooling water and a cooling pipe 64 connected to the cold water tank 1 for cooling a water ring 6. The cold water tank 1 is also connected in sequence to a primary filtration system for preliminary filtration of impurities, a sterilization system for sterilization, and a secondary filtration system for secondary filtration of impurities. The cold water tank 1 is also connected to a recovery pipe 9 for recovering circulating cooling water.

[0034] In this embodiment, the secondary filtering system includes a plurality of groups of multi-stage filtering devices connected in parallel, and the multi-stage filtering devices include a plurality of groups of secondary filters with successively increasing flow accuracy.

[0035] In this embodiment, the sterilization system includes a flow-through ultraviolet sterilizer 3; the primary filtration system includes two sets of primary filters 21 connected in parallel; and the secondary filter includes a secondary filter 51, a tertiary filter 52 and a quaternary filter 53 connected in series.

[0036] In this embodiment, the water ring 6 is provided with a membrane tube embryo 7 for draining cooling water, a water ring support plate 61 and a herringbone plate 71, a collecting box 72 for collecting cooling water, and a water ring vacuum pump 62 connected to the recovery pipe 9 for pumping back the cooling water.

[0037] In this embodiment, the water ring vacuum pump 62 is connected to the manifold 72 via a riser pipe 63 .

[0038] In this embodiment, both the primary filtration system and the secondary filtration system are provided with a diaphragm valve 4 for controlling cooling water.

[0039] In this embodiment, an intermediate water tank 5 for buffering and temporarily storing cooling water is also included. The intermediate water tank 5 is connected to the secondary filtering system and the cooling pipe 64 .

[0040] In this embodiment, the intermediate water tank 5 and the cold water tank 1 are also connected to each other and provided with a sewage pipe 11 for sewage discharge.

[0041] Working principle and usage:

[0042] This system uses a primary filtration system to filter out impurities and large-aperture impurities from the cooling water, and then uses a sterilization system to sterilize the cooling water. Ultraviolet sterilization is used, which will not affect the temperature of the cooling water. After sterilization, the cooling water is filtered again with a higher flow accuracy, and some fine agglomerates that still exist after sterilization are effectively sterilized and impurities are removed before being temporarily stored in the intermediate water tank 5; the intermediate water tank 5 passes the temporarily stored cooling water into the cooling pipe 64 to cool the water ring 6 and the annular membrane bubble. After cooling, the cooling water flows into the collecting box 72 along the human-shaped plate, and the collected cooling water is reused through the lifting pipe 63 and the water ring vacuum pump 62;

[0043] After the recycled cooling water is cooled by the evaporator 84 and the condenser 82, it passes through the drying filter 83 to prevent air moisture and impurities from entering the circulating cooling water, and the cooled cooling water is added to the cold water tank 1 for standby use.

[0044] Example 2

[0045] The only difference between this embodiment and embodiment 1 is that, in this embodiment, the cold water tank 1 is also connected to a chiller for producing cold water, and the chiller includes an evaporator 84 for preliminary refrigeration, a condenser 82 for further refrigeration, a compressor 81 for compressing and transporting cooling water, and a drying filter 83 for impurity filtering, and the inlet of the evaporator 84 is connected to the recovery pipe 9.

[0046] In this embodiment, the compressor 81 is connected to the outlet of the evaporator 84 and the inlet of the condenser 82 , and the drying filter 83 is connected to the outlet of the condenser 82 and the inlet of the evaporator 84 .

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water circulation control system for a water ring process, comprising a cold water tank (1) for providing cooling water and a cooling pipe (64) connected to the cold water tank (1) for cooling a water ring (6), characterized in that: The cold water tank (1) is also connected in sequence to a primary filtering system for preliminary filtering of impurities, a sterilization system for sterilization, and a secondary filtering system for secondary filtering of impurities. The cold water tank (1) is also connected to a recovery pipe (9) for recovering circulating cooling water.

2. A water circulation control system for a water ring process according to claim 1, characterized in that: The secondary filtering system includes a plurality of groups of multi-stage filtering devices connected in parallel, and the multi-stage filtering devices include a plurality of groups of secondary filters with successively increasing flow accuracy.

3. A water circulation control system for a water ring process according to claim 2, characterized in that: The sterilization system comprises a flow-through ultraviolet sterilizer (3); the primary filtration system comprises two sets of primary filters (21) connected in parallel; and the secondary filter comprises a secondary filter (51), a tertiary filter (52) and a quaternary filter (53) connected in series.

4. A water circulation control system for a water ring process according to any one of claims 1 to 3, characterized in that: The cold water tank (1) is also connected to a water chiller for producing cold water, the water chiller comprising an evaporator (84) for preliminary refrigeration, a condenser (82) for further refrigeration, a compressor (81) for compressing and transporting cooling water, and a drying filter (83) for filtering impurities, and the inlet of the evaporator (84) is connected to the recovery pipe (9).

5. A water circulation control system for a water ring process according to claim 4, characterized in that: The compressor (81) is connected to the outlet of the evaporator (84) and the inlet of the condenser (82), and the drying filter (83) is connected to the outlet of the condenser (82) and the inlet of the evaporator (84).

6. A water circulation control system for a water ring process according to any one of claims 1 to 3, characterized in that: The water ring (6) is provided with a membrane tube embryo (7) for draining cooling water, a water ring support plate (61) and a herringbone plate (71), a collecting box (72) for collecting cooling water, and a water ring vacuum pump (62) connected to the recovery pipe (9) for pumping back the cooling water.

7. A water circulation control system for a water ring process according to claim 6, characterized in that: The water ring vacuum pump (62) is connected to the header tank (72) via a lifting pipe (63).

8. A water circulation control system for a water ring process according to any one of claims 1 to 3, characterized in that: It also includes an intermediate water tank (5) for buffering and temporarily storing cooling water, and the intermediate water tank (5) is connected to the secondary filtering system and the cooling pipe (64).

9. A water circulation control system for a water ring process according to claim 8, characterized in that: The intermediate water tank (5) and the cold water tank (1) are also connected to each other and are provided with a sewage discharge pipe (11) for discharging sewage.

10. A water circulation control system for a water ring process according to any one of claims 1 to 3, characterized in that: The primary filtration system and the secondary filtration system are both provided with a diaphragm valve (4) for controlling cooling water.

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