Cooling system for film casting machine

Abstract

The utility model relates to the technical field of industrial cooling, and discloses a cooling system for a film casting machine, which comprises a water tank, a refrigerating machine, a negative pressure tower assembly, a pump valve assembly, a heat exchanger, a data acquisition module and a control module, the data acquisition module is used for acquiring the outdoor temperature and the return water temperature value of the film casting machine; by arranging the negative pressure tower assembly, the operation time of the refrigerating machine is shortened, certain maintenance cost is saved, the heat exchanger, the negative pressure tower assembly and the refrigerating machine are communicated through the pump valve assembly, the pump valve assembly is regulated and controlled, a valve and a water pump are properly switched, and a cooling water operation flow path of a cooling system is flexibly adjusted; namely, the operation mode between the negative pressure tower assembly and the refrigerating machine is adjusted. And the return water temperature is tracked through outdoor temperature and return water temperature values acquired by the data acquisition module, so that the optimal production effect is achieved while the energy-saving benefit is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial cooling, in particular to a cooling system for a film casting machine. Background Art

[0002] The product structure of the cast film machine mainly includes extrusion device, casting device, cast film cooling device, winding device and other parts. The extrusion device melts the plastic particles and sends them to the casting device. The casting device spreads the melted plastic film on the conveyor belt of the frame. The cast film cooling device cools and shapes the plastic film. The winding device rolls the cooled and shaped plastic film into a roll. In the BOPP production line, heat is mainly transferred through the heat exchanger to achieve cooling.

[0003] In the prior art, most of them only use refrigerators to cool the cooling water. Although the effect is good, the energy consumed by the BOPP production line is quite large, which easily causes waste of resources, and the refrigerator needs long-term maintenance, which increases maintenance costs. Utility Model Content

[0004] The purpose of the utility model is to provide a cooling system for a film casting machine to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The utility model solves the technical problem by providing a cooling system for a film casting machine, including a water tank, a refrigerator, a negative pressure tower assembly, a pump valve assembly, a heat exchanger, a data acquisition module and a control module;

[0006] The supply end of the water pool is in communication with a pump-valve assembly, and the pump-valve assembly is in communication with a refrigerator and a heat exchanger, respectively;

[0007] The refrigerator is connected to the negative pressure tower assembly, and the refrigerator is also connected to the negative pressure tower assembly through a pump valve assembly, the heat exchanger is connected to the refrigerator through the pump valve assembly, the heat exchanger is connected to the negative pressure tower assembly through the pump valve assembly, and the negative pressure tower assembly is connected to the reflux end of the water pool;

[0008] The heat exchanger is in communication with the film casting machine, and the data acquisition module is used to collect the outdoor temperature and the return water temperature value of the film casting machine;

[0009] The input end of the control module is connected to the data acquisition module, and the output end of the control module is respectively connected to the refrigerator, the negative pressure tower component and the pump valve component.

[0010] Further, the refrigerator comprises: a condenser and an evaporator;

[0011] The condenser is connected to the negative pressure tower assembly; the evaporator is connected to the heat exchanger through the pump-valve assembly, and the evaporator is also connected to the negative pressure tower assembly through the pump-valve assembly.

[0012] Further, the negative pressure tower assembly includes: a first negative pressure tower and a second negative pressure tower;

[0013] The input end of the first negative pressure tower is connected to the condenser, and the output end of the first negative pressure tower is connected to the reflux end of the water pool;

[0014] The input end of the second negative pressure tower is connected to the heat exchanger through a pump-valve assembly, and the output end of the second negative pressure tower is connected to the evaporator and the reflux end of the water pool through the pump-valve assembly respectively.

[0015] Further, a cooling system for a film casting machine also includes: a flow regulating valve;

[0016] The flow regulating valve is connected to the control module, the flow regulating valve is communicated with the pump valve assembly, the main water channel of the flow regulating valve is communicated with the heat exchanger, and the branch water channel of the flow regulating valve is communicated with the heat exchanger in parallel.

[0017] Further, the pump-valve assembly includes: a first valve, a second valve, a third valve and a chilled water pump;

[0018] The first valve is communicated with the condenser and the supply end of the water tank respectively, the second valve is communicated with the evaporator and the flow regulating valve respectively, the third valve is communicated with the heat exchanger and the chilled water pump respectively, and the chilled water pump is communicated with the evaporator.

[0019] Further, the pump valve assembly further comprises: a fourth valve and a fifth valve;

[0020] The fourth valve is communicated with the heat exchanger and the second negative pressure tower respectively, and the fifth valve is communicated with the second negative pressure tower and the chilled water pump respectively.

[0021] Further, the pump valve assembly further comprises: a sixth valve and a seventh valve;

[0022] The sixth valve is communicated with the supply end of the water pool and the flow regulating valve respectively, and the seventh valve is communicated with the second negative pressure tower and the reflux end of the water pool respectively.

[0023] Furthermore, a cooling system for a film casting machine also includes: a high-position expansion tank; the high-position expansion tank is connected to the fifth valve and the chilled water pump respectively.

[0024] Furthermore, a cooling system for a film casting machine also includes: an internal circulation pump; the internal circulation pump is connected to the heat exchanger and the water tank of the film casting machine respectively.

[0025] Furthermore, a cooling system for a film casting machine also includes: a bypass valve; the bypass valve is connected in parallel with the main water channel of the flow regulating valve.

[0026] The beneficial effects of the utility model are: by setting up the negative pressure tower assembly, the operation time of the refrigerator is reduced, a certain amount of maintenance costs are saved, and the heat exchanger, the negative pressure tower assembly and the refrigerator are connected through the pump valve assembly, the pump valve assembly is regulated, the valve and the water pump are appropriately switched, and the cooling water operation flow path of the cooling system is flexibly adjusted, that is, the operation mode between the negative pressure tower assembly and the refrigerator is adjusted. The outdoor temperature and return water temperature values ​​collected by the data acquisition module are used to track the return water temperature, so as to achieve significantly improved energy-saving benefits and achieve the best production effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a cooling system for a film casting machine provided by an embodiment of the utility model;

[0028] Figure 2 It is a schematic diagram of a cooling system for a film casting machine provided by an embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of a flow path in a serial mode of a cooling system for a film casting machine provided by an embodiment of the utility model.

[0030] Figure numerals: 100, water tank, 200, refrigerator, 210, condenser, 220, evaporator, 300, negative pressure tower assembly, 310, first negative pressure tower, 320, second negative pressure tower, 400, pump and valve assembly, 410, first valve, 420, second valve, 430, third valve, 440, fourth valve, 450, fifth valve, 460, sixth valve, 470, seventh valve, 480, chilled water pump, 490 cooling water pump, 500, heat exchanger, 600, film casting machine, 700, data acquisition module, 800, flow regulating valve, 810, bypass valve, 900, internal circulation pump, 910, high-level expansion tank. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0033] It should be noted that although the functional modules are divided in the system diagram, in some cases, the modules can be divided differently from those in the system. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0034] Reference Figure 1 and Figure 2 In some embodiments of the present invention, a cooling system for a film casting machine includes: a water pool 100, a pump valve assembly 400, a refrigerator 200, a heat exchanger 500, a negative pressure tower assembly 300, a control module and a data acquisition module 700.

[0035] The supply end of the water pool 100 is connected to the pump-valve assembly 400 , and the supply end of the water pool 100 is connected to the refrigerator 200 through the pump-valve assembly 400 ; the supply end of the water pool 100 is connected to the heat exchanger 500 through the pump-valve assembly 400 .

[0036] The refrigerator 200 is connected to the heat exchanger 500 through the pump-valve assembly 400; the heat exchanger 500 is connected to the negative pressure tower assembly 300 through the pump-valve assembly 400; the negative pressure tower assembly 300 is connected to the refrigerator 200 through the pump-valve assembly 400.

[0037] The refrigerator 200 is also directly connected to the negative pressure tower assembly 300, and the negative pressure tower assembly 300 is connected to the reflux end of the water pool 100. The heat exchanger 500 is connected to the water tank in the film casting machine 600, and the heat exchanger 500 uses the inflowing cooling water to cool the film casting machine 600.

[0038] The data acquisition module 700 can collect outdoor temperature and humidity to obtain the outdoor temperature; the data acquisition module 700 can also be set on the return water pipe of the film casting machine 600 to collect the water temperature on the return water pipe to obtain the return water temperature value.

[0039] The input end of the control module is electrically connected to the data acquisition module 700, and the output end of the control module is electrically connected to the refrigerator 200, the negative pressure tower assembly 300 and the pump valve assembly 400. After comparing the outdoor temperature and the return water temperature with the set process temperature value, the control module adjusts the pump valve assembly 400 to appropriately switch the valve and the water pump, adjust the cooling water operation flow path, control the operation of the negative pressure tower assembly 300 and / or the refrigerator 200, and switch the operation mode between the negative pressure tower assembly 300 and the refrigerator 200.

[0040] Since the oil and refrigerant of the refrigerator 200 need to be replaced every 2000 hours of operation, and at least 4 refrigerators 200 and 3 cold water pumps are required in the two film production lines, the cost and energy consumption are huge.

[0041] In the scheme of the above embodiment, the negative pressure tower assembly 300 is set to reduce the operating time of the refrigerator 200 and save a certain amount of maintenance costs. The heat exchanger 500, the negative pressure tower assembly 300 and the refrigerator 200 are connected through the pump valve assembly 400. The control module regulates the pump valve assembly 400, appropriately switches the valve and the water pump, and flexibly adjusts the cooling water running flow path of the cooling system, that is, switches the operating mode between the negative pressure tower assembly 300 and the refrigerator 200. The outdoor temperature and return water temperature collected by the data acquisition module 700 are used to track the return water temperature and production conditions, so as to achieve significantly improved energy-saving benefits and achieve the best production effect.

[0042] Reference Figure 1 and Figure 2 In some embodiments of the present invention, the refrigerator 200 includes: a condenser 210 and an evaporator 220 .

[0043] The evaporator 220 in the refrigerator 200 is connected in parallel and in communication with the heat exchanger 500 through the pump-valve assembly 400 ; the negative pressure tower assembly 300 is connected in communication with the evaporator 220 in the refrigerator 200 through the pump-valve assembly 400 .

[0044] The condenser 210 in the refrigerator 200 is connected to the negative pressure tower assembly 300 .

[0045] Reference Figure 1 and Figure 2 In some embodiments of the present utility model, the cooling system further includes: an internal circulation pump 900 , a flow regulating valve 800 and a bypass valve 810 .

[0046] The flow regulating valve 800 is electrically connected to the control module, the flow regulating valve 800 is connected to the pump valve assembly 400, the main water channel of the flow regulating valve 800 is connected to the cooling side of the heat exchanger 500, the branch water channel of the flow regulating valve 800 is connected in parallel with the heat exchanger 500, and the flow regulating valve 800 regulates the flow of cooling water flowing into the heat exchanger 500.

[0047] When the flow regulating valve 800 is in a closed state, cooling water passes through the branch water channel of the flow regulating valve 800 to keep the flow and pressure of the cooling pipeline stable. The flow regulating valve 800 is an E / P (electric / pneumatic) control valve.

[0048] The bypass valve 810 is connected in parallel with and in communication with the main water path of the flow regulating valve 800 . The bypass valve 810 can respond to a user trigger, thereby regulating the flow of cooling water flowing into the heat exchanger 500 .

[0049] When the flow regulating valve 800 fails or is out of control, the user can adjust the flow of cooling water through the bypass valve 810 to keep the temperature of the water tank of the film casting machine 600 stable and ensure the reliability and stability of the cooling system.

[0050] One end of the inner circulation valve is connected to the water tank of the film casting machine 600, and the other end of the inner circulation valve is connected to the exchange side of the heat exchanger 500. The inner circulation pump 900 is used to pump out the water in the water tank of the film casting machine 600 and make it flow through the heat exchanger 500. Through the inner circulation pump 900, the required cooling water in the water tank of the film casting machine 600 is pumped faster, thereby realizing the acceleration of the heat exchange efficiency of the heat exchanger 500.

[0051] Through the solution of the above embodiment, the cooling system realizes constant temperature control of the water tank in the film casting machine 600 through the coordinated work of the internal circulation water pump, the heat exchanger 500, the flow regulating valve 800, the control module and the data acquisition module 700.

[0052] Reference Figure 1 and Figure 2 In some embodiments of the present invention, the negative pressure tower assembly 300 includes: a first negative pressure tower 310 and a second negative pressure tower 320 .

[0053] The input end of the first negative pressure tower 310 is connected to the condenser 210 in the refrigerant, and the output end of the first negative pressure tower 310 is connected to the reflux end of the water pool 100 .

[0054] The input end of the second negative pressure tower 320 is connected to the fourth valve 440 to be connected to the heat exchanger 500. The output end of the second negative pressure tower 320 is connected to the fifth valve 450, and the second negative pressure tower 320 is connected to the evaporator 220 in the refrigerator 200 through the chilled water pump 480.

[0055] The output end of the second negative pressure tower 320 is connected to the fifth valve 450 , so that the second negative pressure tower 320 is connected to the reflux end of the pool 100 .

[0056] Reference Figures 1 to 3 In some embodiments of the present invention, the pump valve assembly 400 includes: a first valve 410 , a second valve 420 , a third valve 430 , a fourth valve 440 , a fifth valve 450 , a sixth valve 460 , a seventh valve 470 , a chilled water pump 480 and a cooling water pump 490 .

[0057] The cooling water pump 490 is connected to the supply end of the water tank 100, one end of the first valve 410 is connected to the cooling water pump 490, and the other end of the first valve 410 is connected to the condenser 210 in the refrigerator 200. One end of the second valve 420 is connected to the evaporator 220 in the refrigerator 200, and the other end of the second valve 420 is connected to the heat exchanger 500 through the flow control valve 800. One end of the third valve 430 is connected to the heat exchanger 500, and the other end of the third valve 430 is connected to the chilled water pump 480, and the chilled water pump 480 is connected to the evaporator 220 in the refrigerator 200.

[0058] In one embodiment, if the current operation mode is the cooling mode, the control module controls the first valve 410, the second valve 420, the third valve 430, the chilled water pump 480 and the cooling water pump 490 to open, and the remaining valves of the pump valve assembly 400 are closed. The control module drives the first negative pressure tower 310 and the refrigerator 200 to operate, and controls the second negative pressure tower 320 to stop operating.

[0059] The cooling water flows from the water pool 100 through the cooling water pump 490 , sequentially flows through the first valve 410 , the condenser 210 in the refrigerator 200 , and the first negative pressure tower 310 , and flows back to the water pool 100 from the first negative pressure tower 310 .

[0060] The chilled water flows out from the evaporator 220 in the refrigerator 200, flows through the second valve 420 in turn, flows through the flow regulating valve 800 for regulation, and flows into the heat exchanger 500 for heat exchange. The chilled water after heat exchange passes through the third valve 430 and the chilled water pump 480 and flows back to the evaporator 220 in the refrigerator 200.

[0061] Among them, when running in cooling mode, the closed circulation loop and the high-level expansion tank are used for pipe exhaust. The energy consumption of this mode is at the highest level.

[0062] One end of the fourth valve 440 is connected to the cooling side of the heat exchanger 500, and the other end of the fourth valve 440 is connected to the input end of the second negative pressure tower 320. One end of the fifth valve 450 is connected to the output end of the second negative pressure tower 320, and the other end of the fifth valve 450 is connected to the chilled water pump 480.

[0063] In one embodiment, referring to Figure 3 If the current operation mode is the serial mode, the control module controls the first valve 410, the second valve 420, the fourth valve 440, the fifth valve 450, the chilled water pump 480 and the cooling water pump 490 to open, and the remaining valves of the pump valve assembly 400 are closed. The control module drives the first negative pressure tower 310 to operate, the second negative pressure tower 320 and the refrigerator 200 to operate.

[0064] The cooling water flows from the water pool 100 through the cooling water pump 490 , sequentially flows through the first valve 410 , the condenser 210 in the refrigerator 200 , and the first negative pressure tower 310 , and flows back to the water pool 100 from the first negative pressure tower 310 .

[0065] The chilled water flows out from the evaporator 220 in the refrigerator 200, flows through the second valve 420 in sequence, flows through the flow regulating valve 800 for regulation, and flows into the heat exchanger 500 for heat exchange. The chilled water after heat exchange flows into the second negative pressure tower 320 for heat exchange through the fourth valve 440, and then flows through the fifth valve 450 and the chilled water pump 480 in sequence, and flows back to the evaporator 220 in the refrigerator 200.

[0066] Among them, when running in serial mode, the energy consumption of this mode is at a medium level.

[0067] One end of the sixth valve 460 is connected to the cooling water pump 490, the other end of the sixth valve 460 is connected to the heat exchanger 500 through the flow regulating valve 800, one end of the seventh valve 470 is connected to the output end of the second negative pressure tower 320, and the seventh valve 470 is connected to the reflux end of the water pool 100.

[0068] In one embodiment, if the current operation mode is the negative pressure tower mode, the control module controls the sixth valve 460, the fourth valve 440, the seventh valve 470 and the cooling water pump 490 to operate, and controls the remaining valves in the pump valve assembly 400 and the freezing water pump 480 to close. The control module drives the second negative pressure tower 320 to operate, and controls the first negative pressure tower 310 and the refrigerator 200 to stop operating.

[0069] The cooling water flows from the water pool 100 through the cooling water pump 490, flows through the sixth valve 460 and the flow regulating valve 800 in sequence, and flows into the heat exchanger 500 for heat exchange. The cooling water after heat exchange flows into the second negative pressure tower 320 for heat exchange through the fourth valve 440, and then flows through the seventh valve 470 and flows back to the water pool 100.

[0070] When the negative pressure tower mode is operated, the cooling water flows directly through the heat exchanger 500, and directly cools the water tank in the film casting machine 600 through the heat exchanger 500. This mode consumes the least power and the energy consumption of this mode is at the lowest level.

[0071] Reference Figure 1 and Figure 2 In some embodiments of the present invention, the cooling system further includes: a high-position expansion tank 910 .

[0072] The high-level expansion tank 910 is arranged between the fifth valve 450 and the chilled water pump 480. If the current operating mode is the cooling mode, the closed circulation loop, the high-level expansion tank is the pipeline exhaust, and the operating energy consumption of this mode is the highest level.

[0073] The preferred implementation methods of the utility model are specifically described above, but the invention of the utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the utility model. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A cooling system for a film casting machine, characterized in that: include: Water tank, refrigerator, negative pressure tower assembly, pump and valve assembly, heat exchanger, data acquisition module and control module; The supply end of the water pool is in communication with a pump-valve assembly, and the pump-valve assembly is in communication with a refrigerator and a heat exchanger, respectively; The refrigerator is connected to the negative pressure tower assembly, and the refrigerator is also connected to the negative pressure tower assembly through a pump valve assembly, the heat exchanger is connected to the refrigerator through the pump valve assembly, the heat exchanger is connected to the negative pressure tower assembly through the pump valve assembly, and the negative pressure tower assembly is connected to the reflux end of the water pool; The heat exchanger is in communication with the film casting machine, and the data acquisition module is used to collect the outdoor temperature and the return water temperature value of the film casting machine; The input end of the control module is connected to the data acquisition module, and the output end of the control module is respectively connected to the refrigerator, the negative pressure tower component and the pump valve component.

2. A cooling system for a film casting machine according to claim 1, characterized in that: The refrigerator comprises: a condenser and an evaporator; The condenser is connected to the negative pressure tower assembly; the evaporator is connected to the heat exchanger through the pump-valve assembly, and the evaporator is also connected to the negative pressure tower assembly through the pump-valve assembly.

3. A cooling system for a film casting machine according to claim 2, characterized in that: The negative pressure tower assembly comprises: a first negative pressure tower and a second negative pressure tower; The input end of the first negative pressure tower is connected to the condenser, and the output end of the first negative pressure tower is connected to the reflux end of the water pool; The input end of the second negative pressure tower is connected to the heat exchanger through a pump-valve assembly, and the output end of the second negative pressure tower is connected to the evaporator and the reflux end of the water pool through the pump-valve assembly respectively.

4. A cooling system for a film casting machine according to claim 3, characterized in that: return Including: flow control valve; The flow regulating valve is connected to the control module, the flow regulating valve is communicated with the pump valve assembly, the main water channel of the flow regulating valve is communicated with the heat exchanger, and the branch water channel of the flow regulating valve is communicated with the heat exchanger in parallel.

5. A cooling system for a film casting machine according to claim 4, characterized in that: The pump-valve assembly comprises: a first valve, a second valve, a third valve and a chilled water pump; The first valve is communicated with the condenser and the supply end of the water tank respectively, the second valve is communicated with the evaporator and the flow regulating valve respectively, the third valve is communicated with the heat exchanger and the chilled water pump respectively, and the chilled water pump is communicated with the evaporator.

6. A cooling system for a film casting machine according to claim 5, characterized in that: The pump valve assembly further includes: a fourth valve and a fifth valve; The fourth valve is communicated with the heat exchanger and the second negative pressure tower respectively, and the fifth valve is communicated with the second negative pressure tower and the chilled water pump respectively.

7. A cooling system for a film casting machine according to claim 4, characterized in that: The pump valve assembly further includes: a sixth valve and a seventh valve; The sixth valve is communicated with the supply end of the water pool and the flow regulating valve respectively, and the seventh valve is communicated with the second negative pressure tower and the reflux end of the water pool respectively.

8. A cooling system for a film casting machine according to claim 6, characterized in that: Also includes: A high-position expansion tank; the high-position expansion tank is connected to the fifth valve and the chilled water pump respectively.

9. A cooling system for a film casting machine according to claim 1, characterized in that: Also includes: An internal circulation pump; the internal circulation pump is connected to the heat exchanger and the water tank of the film casting machine respectively.

10. A cooling system for a film casting machine according to claim 4, characterized in that: Also includes: Bypass valve; the bypass valve is connected in parallel with the main water channel of the flow regulating valve.

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