A mold heat exchange system

Abstract

The invention discloses a mold heat exchange system, which belongs to the technical field of plastic processing molds, comprising: a cooling circulation system and a steam circulation system connected to a heat exchange flow channel of the mold, the cooling circulation system being used for sending cooling water in an atomized state into the heat exchange flow channel to cool the mold; the cooling circulation system comprising a vacuum pump, the vacuum pump being connected to the heat exchange flow channel and being used for controlling the pressure in the heat exchange flow channel; the steam circulation system being used for sending steam into the heat exchange flow channel of the mold, and heating the mold by using the steam; when the mold needs to be cooled, the present application utilizes that the evaporation heat transfer coefficient of water is 5-10 times of the convective heat transfer coefficient, and the cooling rate is very fast, thereby achieving the purpose of rapid cooling of the mold; when the mold needs to be heated, a temperature-flow linkage is formed through the mold temperature and a condensate delivery pump, and the flow rate of the condensate delivery pump is controlled based on the temperature of the mold, thereby controlling the amount of steam required for heating the mold, thereby achieving a rapid heating effect.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing moulds, and in particular to a mould heat exchange system. Background Art

[0002] With the rapid development of the plastics industry, plastic products are widely used in all walks of life and have penetrated into all aspects of people's production and life. In recent years, the growing demand for injection molded products in the fields of automobiles, construction, household appliances, food, medicine and health has significantly promoted the rapid development and improvement of plastic injection molding technology. Whether the temperature of the mold is suitable during the injection molding process will directly affect the dimensional accuracy, appearance, internal quality and product production efficiency of the injection molded product. Therefore, the temperature of the mold is a very important variable in the injection molding process.

[0003] Injection molding requires a mold temperature control system to meet the product temperature requirements. The temperature control system can be divided into two types: cooling system and heating system according to different situations. The common method of mold cooling is to open a cooling water channel in the mold, and use circulating cooling water to take away the heat of the mold by convection heat transfer before the mold is demolded. Secondly, the mold directly exchanges heat with the surrounding air through the outer surface to achieve auxiliary cooling. In the existing mold cooling technology, in addition to using cooling water to cool down, liquefied gas can also be introduced into the mold channel to use phase change to achieve cooling. In the actual application process, when cooling water is used to cool the mold, the mold temperature is uneven and the cooling is slow, and the effect of rapid cooling and precise temperature control cannot be achieved, resulting in low production efficiency and high defective rate of plastic parts. Using liquefied gas for cooling is under high pressure conditions, the cost is high, and it is easy to cause safety accidents, leading to production suspension and production reduction. The heating system uses hot water or steam to increase the temperature in the mold heating channel. Electric heating elements can also be installed inside and around the mold. Using a steam generator to generate steam to heat the mold is green and environmentally friendly. Because the steam must fill the channel, the steam consumption can only be adjusted by the flow rate, resulting in steam waste, increased costs and reduced production efficiency. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides a mold heat exchange system, comprising: a cooling circulation system;

[0005] The output end of the cooling circulation system is connected to the input end of the heat exchange channel of the mold, and the input end of the cooling circulation system is connected to the output end of the heat exchange channel of the mold. The cooling circulation system is used to send cooling water in an atomized state into the heat exchange channel to cool the mold;

[0006] A vacuum pump connected to the heat exchange flow channel of the mold and used to control the pressure in the heat exchange flow channel of the mold;

[0007] Steam circulation system;

[0008] The output end of the steam circulation system is connected to the input end of the heat exchange flow channel of the mold, and the input end of the steam circulation system is connected to the output end of the heat exchange flow channel of the mold. The steam circulation system is used to send steam into the heat exchange flow channel of the mold to heat the mold with steam;

[0009] When cooling the mold, cooling water enters the heat exchange flow channel of the mold and is sprayed in an atomized state. The pressure in the heat exchange flow channel of the mold is controlled by a vacuum pump. The evaporation of water is related to temperature, and the phase change temperature of water is controlled to achieve different phase change temperatures of water under different pressures. The heat of the mold is quickly absorbed by the phase change heat to achieve the purpose of rapid cooling.

[0010] When the mold is heated up, after the water vapor enters the heat exchange flow channel of the mold, the vacuum pump is used to control the pressure in the heat exchange flow channel of the mold to stabilize the water vapor in a steam state. By changing the steam flow entering the heat exchange flow channel, the mold temperature is controlled, thereby achieving the purpose of rapid heating of the mold.

[0011] Furthermore, the cooling circulation system comprises: a cooler, a cooling water delivery pump, a nozzle and a cold and hot fluid delivery pipe;

[0012] The output end of the cooler is connected to the water inlet pipe of the cooling water delivery pump, the water outlet of the cooling water delivery pump is connected to one end of the cold and hot fluid delivery pipe, and the other end of the cold and hot fluid delivery pipe is connected to the input pipe of the cooler;

[0013] The cold and hot fluid delivery pipe is arranged in the heat exchange flow channel, and a distance is left between the cold and hot fluid delivery pipe and the inner wall of the heat exchange flow channel, and the nozzles are evenly arranged on the surface of the cold and hot fluid delivery pipe;

[0014] The two ends of the cold and hot fluid delivery pipe are sealed and connected to the two ends of the heat exchange flow channel.

[0015] Furthermore, the nozzles are evenly spaced apart in a plurality of groups, each group of nozzles is provided with at least three nozzles, and are evenly arranged on the cold and hot fluid delivery pipes along the axial direction.

[0016] Furthermore, the vacuum pump is connected to the heat exchange channel by a pipeline, and a temperature monitor and a pressure monitor linked to the vacuum pump are installed in parallel on the pipeline;

[0017] The temperature monitor is used to detect the temperature of the mold in real time and send the temperature signal to the vacuum pump. The pressure monitor is used to detect the pressure in the heat exchange channel in real time and send the pressure signal to the vacuum pump. After receiving the temperature signal and the pressure signal, the vacuum pump forms a temperature-pressure linkage based on the temperature signal and the pressure signal, and regulates the pressure in the heat exchange channel and the flow rate of cooling water based on the temperature of the mold, so that the atomized cooling water undergoes an isothermal phase change in the entire mold.

[0018] Further, the steam circulation system includes: a steam trap, a condensate delivery pump, and a steam generating device;

[0019] The output end of the steam generating device is connected to one end of the cold and hot fluid delivery pipe, the other end of the cold and hot fluid delivery pipe is connected to the input end of the steam trap, the output end of the steam trap is connected to the input end of the condensate delivery pump, and the output end of the condensate delivery pump is connected to the input end of the steam generating device;

[0020] The condensate delivery pump is also connected to the temperature monitor.

[0021] Furthermore, water vapor is sent into the hot fluid delivery pipe through the steam generating device and then sprayed out from the nozzle. The pressure in the heat exchange flow channel is controlled by the vacuum pump so that the steam in the heat exchange flow channel reaches a saturated state, and the temperature of the steam is stabilized under the current saturated state. The mold temperature is fed back to the condensate delivery pump, and the flow rate of the condensate delivery pump is adjusted based on the temperature signal sent by the temperature monitor, thereby forming a temperature-flow linkage, thereby controlling the amount of steam required for the mold to heat up, and then accurately controlling the mold temperature.

[0022] Furthermore, the steam trap is also connected to the cooler to send the stored condensed water into the cooler.

[0023] Furthermore, a valve is provided on the pipeline between the cold and hot fluid delivery pipe and the steam trap, a valve is provided on the pipeline between the cold and hot fluid delivery pipe and the cooler, a valve is provided on the pipeline between the steam generating device and the cold and hot fluid delivery pipe, and a valve is provided on the pipeline between the cooling water delivery pump and the cold and hot fluid delivery pipe.

[0024] Beneficial effects of the present invention:

[0025] When the mold needs to be cooled, the conventional cooling method of the mold is to use convection heat transfer between the cooling water and the mold, and the cooling rate is low. This application uses the evaporation heat transfer coefficient of water, which is 5-10 times the convection heat transfer coefficient, and the cooling rate is very fast, thereby achieving the purpose of rapid cooling of the mold.

[0026] When the mold needs to be heated up, a temperature-flow linkage is formed through the mold temperature and the condensate delivery pump. The flow of the condensate delivery pump is controlled based on the mold temperature, thereby controlling the amount of steam required for the mold to heat up, thereby achieving a rapid heating effect.

[0027] In the traditional mold cooling method, the cooling water has a low inlet temperature and a high outlet temperature, which causes the mold to have a low temperature at the water inlet and a high temperature at the water outlet. The overall temperature is uneven, which has a certain impact on the product quality. This application controls the phase change pressure of the water in the heat exchange flow channel to be consistent, so that the evaporation temperature of the water in the mold cavity is consistent, and the entire mold is cooled evenly. At the same time, a vacuum pump is used to suck away the steam to achieve the purpose of continuous and uniform cooling of the mold.

[0028] When the mold is heated up, a vacuum pump is used to control the pressure of the heat exchange flow channel to be consistent, so that the temperature of the steam in the entire mold cavity is stabilized at the saturated steam pressure, thereby making the overall temperature of the mold evenly heated. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is the principle block diagram of the mold heat exchange system;

[0031] Figure 2 It is a schematic side view of the mold provided by the present invention.

[0032] Figure numerals: 1 is a mold, 2 is a cooling water circulation system, 3 is a steam circulation system, 4 is a cold and hot fluid delivery pipe, 5 is a nozzle, 6 is a heat exchange flow channel, 7 is a vacuum pump, 8 is a cooler, 9 is a cooling water delivery pump, 10 is a steam trap, 11 is a condensate delivery pump, and 12 is a steam generating device. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1 to Figure 2 , a mold heat exchange system, comprising:

[0035] Injection mold 1, producing the core components of injection products, the melt needs to be heated or cooled before demoulding, and the mold temperature is uniform so that the temperature of the plastic part is uniform, thereby producing qualified plastic parts;

[0036] Cooling circulation system 2;

[0037] The output end of the cooling circulation system 2 is connected to the input end of the heat exchange channel 6 of the mold 1, and the input end of the cooling circulation system 2 is connected to the output end of the heat exchange channel 6 of the mold 1. The cooling circulation system 2 is used to send cooling water into the heat exchange channel 6 in an atomized state to cool the mold 1;

[0038] A vacuum pump 7, wherein the vacuum pump 7 is connected to the heat exchange flow channel 6 of the mold and is used to control the pressure in the heat exchange flow channel 6 of the mold;

[0039] The cooling circulation system 2 includes: a cooler 8, a cooling water delivery pump, a nozzle 5 and a cold and hot fluid delivery pipe 4;

[0040] The output end of the cooler 8 is connected to the water inlet pipe of the cooling water delivery pump, the water outlet end of the cooling water delivery pump is connected to one end of the cold and hot fluid delivery pipe 4, and the input end of the cooler 8 is connected to the other end of the cold and hot fluid delivery pipe 4;

[0041] The cold and hot fluid delivery pipe is arranged in the heat exchange flow channel 6, and a distance is left between the cold and hot fluid delivery pipe 4 and the inner wall of the heat exchange flow channel 6, and the nozzles 5 are evenly arranged on the surface of the cold and hot fluid delivery pipe 4;

[0042] Both ends of the cold and hot fluid delivery pipe 4 are sealedly connected to both ends of the heat exchange channel 6 .

[0043] The nozzles 5 are evenly spaced and arranged in a plurality of groups, each group of nozzles 5 is provided with at least three nozzles, and are evenly arranged on the cold and hot fluid delivery pipe along the axial direction.

[0044] The vacuum pump 7 is connected to the heat exchange channel 6 through a pipeline, and a temperature monitor and a pressure monitor linked to the vacuum pump 7 are installed in parallel on the pipeline;

[0045] The temperature monitor is used to detect the temperature of the mold 1 in real time and send the temperature signal to the vacuum pump 7. The pressure monitor is used to detect the pressure in the heat exchange channel 6 in real time and send the pressure signal to the vacuum pump 7. After receiving the temperature signal and the pressure signal, the vacuum pump 7 forms a temperature-pressure linkage based on the temperature signal and the pressure signal, and regulates the pressure in the heat exchange channel 6 and the flow rate of cooling water based on the temperature of the mold 1, so that the atomized cooling water undergoes an isothermal phase change in the entire mold 1.

[0046] Specifically, the cooling water is delivered to the mold 1 via the cooling water delivery pump 9, and the vacuum pump 7 is used to control the pressure of the heat exchange channel 6, so that the atomized cooling water undergoes an isothermal phase change in the entire mold, absorbs the heat of the mold 1, and reduces the mold temperature through the temperature detector and feeds back to the vacuum pump 7, forming a temperature-pressure linkage, thereby controlling the pressure in the heat exchange channel and achieving precise control of the mold temperature.

[0047] The cooling water in the cold and hot fluid delivery pipe 4 is atomized by the nozzle 5 to form atomized cooling water. The water mist of the nozzle 5 covers the surface of the heat exchange flow channel 6 at an angle of 360°. Figure 2 As shown, when the mold 1 is cooled, multiple nozzles on the cold and hot fluid delivery pipes spray water mist at the same time, and the atomized cooling water undergoes phase change to absorb the heat of the mold. Since the phase change heat transfer coefficient is much larger than the conventional convection heat transfer coefficient, the purpose of rapid cooling of the injection mold is achieved. At the same time, the overall temperature of the mold 1 is uniformly reduced to achieve a uniform mold temperature. The cooling water vapor is cooled and stored by the cooler 8, and is delivered to the mold 1 by the cooling water delivery pump 9 to form water mist, forming a closed-loop injection mold cooling system.

[0048] Steam circulation system 3;

[0049] The output end of the steam circulation system 3 is connected to the input end of the heat exchange channel 6 of the mold 1, and the input end of the steam circulation system 3 is connected to the output end of the mold 1. The steam circulation system 3 is used to send steam into the heat exchange channel 6 of the mold 1 to heat the mold 1 with steam;

[0050] When cooling the mold 1, cooling water enters the heat exchange channel 6 and is sprayed in an atomized state. The pressure in the heat exchange channel 6 of the mold 1 is controlled by the vacuum pump 7. The evaporation of water is related to the temperature, and the phase change temperature of the water is controlled to achieve different phase change temperatures of water under different pressures. The heat of the mold 1 is quickly absorbed by the phase change heat to achieve the purpose of rapid cooling.

[0051] When the temperature of the mold 1 is increased, after the water vapor enters the heat exchange channel 6 of the mold 1, the pressure in the heat exchange channel 6 of the mold 1 is controlled by the vacuum pump 7 to stabilize the water vapor in the steam state. By changing the steam flow rate entering the heat exchange channel 6, the temperature of the mold 1 is controlled, thereby achieving the purpose of rapid heating of the mold 1.

[0052] The steam circulation system 3 includes: a steam trap 10, a condensate delivery pump 11, and a steam generating device 12;

[0053] The output end of the steam generating device 12 is connected to one end of the cold and hot fluid delivery pipe 4, the other end of the cold and hot fluid delivery pipe 4 is connected to the input end of the steam trap 10, the output end of the steam trap 10 is connected to the input end of the condensate delivery pump 11, and the output end of the condensate delivery pump 11 is connected to the input end of the steam generating device 12;

[0054] The condensate delivery pump 11 is also connected to the temperature monitor.

[0055] Water vapor is sent into the hot fluid delivery pipe through the steam generating device 12, and then sprayed out from the nozzle 5. The pressure in the heat exchange flow channel 6 is controlled by the vacuum pump 7 to stabilize the temperature of the steam under the saturated steam pressure. The temperature of the mold 1 is fed back to the condensate delivery pump 11. Based on the temperature signal sent by the temperature monitor, the flow rate of the condensate delivery pump 11 is adjusted to form a temperature-flow linkage, thereby controlling the amount of steam required for heating the mold 1, and then accurately controlling the temperature of the mold 1.

[0056] Specifically, the process is as follows: water vapor is transported to the mold 1 through the steam generator, the steam is ejected by the nozzle, the pressure in the heat exchange channel is controlled by the vacuum pump 7, the steam is stabilized at the temperature under the saturated steam pressure, the mold temperature is fed back to the condensate delivery pump 11, the flow of the condensate delivery pump 11 is adjusted, a temperature-flow linkage is formed, and the amount of steam required for the mold 1 to heat up is controlled, thereby accurately controlling the temperature of the mold 1. After the vapor-liquid mixture is separated by the steam trap 10, it is transported to the steam generator 12 by the condensate delivery pump 11, and the water vapor is transported to the mold 1 through the hot fluid delivery pipeline, forming a closed-loop injection mold heating system.

[0057] The steam trap 10 is also connected to the cooler 8 for sending the stored condensed water into the cooler 8 .

[0058] A valve is provided on the pipeline between the cold and hot fluid delivery pipe 4 and the steam trap 10, a valve is provided on the pipeline between the cold and hot fluid delivery pipe 4 and the cooler 8, a valve is provided on the pipeline between the steam generating device 12 and the cold and hot fluid delivery pipe 4, and a valve is provided on the pipeline between the cooling water delivery pump and the cold and hot fluid delivery pipe 4.

[0059] Among them, the inventive point of the present invention is that it innovates on the basis of the traditional mold heat exchange form. The cooling and heating system controls the pressure in the heat exchange flow channel to vaporize the water mist, controls the pressure in the mold heat exchange flow channel through a vacuum pump, and utilizes the correlation between water evaporation and temperature to control the phase change temperature of water, thereby achieving different phase change temperatures of water under different pressures, and using phase change heat to quickly absorb mold heat to achieve the purpose of rapid cooling. The phase change pressure of water in the heat exchange flow channel is controlled to be consistent, and the phase change temperature of water in the entire flow channel is consistent, so that the overall temperature of the mold is cooled evenly, thereby achieving the purpose of precise temperature control.

[0060] When the mold is heated up, the pressure in the heat exchange flow channel of the mold is controlled by the vacuum pump to stabilize the water vapor in the steam state. The flow of the condensate delivery pump is adjusted by temperature feedback to control the mold temperature, thereby more efficiently exchanging heat with the mold, achieving the purpose of rapid cooling and heating of the injection mold, precise temperature control, safety and reliability, thereby achieving the multiple effects of improving the quality of plastic parts, reducing production costs, and improving production efficiency, and realizing efficient and green production of plastic parts.

[0061] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mold heat exchange system, characterized in that: include: Cooling circulation system; The output end of the cooling circulation system is connected to the input end of the heat exchange channel of the mold, and the input end of the cooling circulation system is connected to the output end of the heat exchange channel of the mold. The cooling circulation system is used to send cooling water in an atomized state into the heat exchange channel to cool the mold; The cooling circulation system comprises: a cooler, a cooling water delivery pump, a nozzle and a cold and hot fluid delivery pipe; The output end of the cooler is connected to the water inlet pipe of the cooling water delivery pump, the water outlet of the cooling water delivery pump is connected to one end of the cold and hot fluid delivery pipe, and the other end of the cold and hot fluid delivery pipe is connected to the input pipe of the cooler; The cold and hot fluid delivery pipe is arranged in the heat exchange flow channel, and a distance is left between the cold and hot fluid delivery pipe and the inner wall of the heat exchange flow channel, and the nozzles are evenly arranged on the surface of the cold and hot fluid delivery pipe; the nozzles cover the surface of the heat exchange flow channel at an angle of 360°; The two ends of the cold and hot fluid delivery pipe are sealed and connected to the two ends of the heat exchange flow channel; A vacuum pump connected to the heat exchange flow channel of the mold and used to control the pressure in the heat exchange flow channel of the mold; The vacuum pump is connected to the heat exchange channel through a pipeline, and a temperature monitor and a pressure monitor linked to the vacuum pump are installed in parallel on the pipeline; The temperature monitor is used to detect the temperature of the mold in real time and send the temperature signal to the vacuum pump. The pressure monitor is used to detect the pressure in the heat exchange channel in real time and send the pressure signal to the vacuum pump. After receiving the temperature signal and the pressure signal, the vacuum pump forms a temperature-pressure linkage based on the temperature signal and the pressure signal, and regulates the pressure in the heat exchange channel and the flow rate of cooling water based on the temperature of the mold, so that the atomized cooling water undergoes an isothermal phase change in the entire mold. Steam circulation system; The output end of the steam circulation system is connected to the input end of the heat exchange flow channel of the mold, and the input end of the steam circulation system is connected to the output end of the heat exchange flow channel of the mold. The steam circulation system is used to send steam into the heat exchange flow channel of the mold to heat the mold with steam; The steam circulation system comprises: a steam trap, a condensate delivery pump, and a steam generating device; The output end of the steam generating device is connected to one end of the cold and hot fluid delivery pipe, the other end of the cold and hot fluid delivery pipe is connected to the input end of the steam trap, the output end of the steam trap is connected to the input end of the condensate delivery pump, and the output end of the condensate delivery pump is connected to the input end of the steam generating device; The condensate delivery pump is also connected to the temperature monitor; When cooling the mold, cooling water enters the heat exchange flow channel of the mold and is sprayed in an atomized state. The pressure in the heat exchange flow channel of the mold is controlled by a vacuum pump. The evaporation of water is related to temperature, and the phase change temperature of water is controlled to achieve different phase change temperatures of water under different pressures. The heat of the mold is quickly absorbed by the phase change heat to achieve the purpose of rapid cooling. When the mold is heated up, after the water vapor enters the heat exchange flow channel of the mold, the pressure in the heat exchange flow channel of the mold is controlled by a vacuum pump to stabilize the water vapor in a steam state. By changing the steam flow entering the heat exchange flow channel, the mold temperature is controlled, thereby achieving the purpose of rapid heating of the mold. Water vapor is sent into the hot and cold fluid delivery pipes through the steam generating device and then sprayed out from the nozzle. The pressure in the heat exchange flow channel is controlled by the vacuum pump to make the steam in the heat exchange flow channel reach a saturated state, and the temperature of the steam is stabilized under the current saturated state. The mold temperature is fed back to the condensate delivery pump, and the flow rate of the condensate delivery pump is adjusted based on the temperature signal sent by the temperature monitor, forming a temperature-flow linkage, thereby controlling the amount of steam required for the mold to heat up, and then accurately controlling the mold temperature.

2. The mold heat exchange system according to claim 1, characterized in that: The nozzles are evenly spaced and arranged in a plurality of groups, each group of nozzles has at least three nozzles, and are evenly arranged on the cold and hot fluid delivery pipes along the axial direction.

3. The mold heat exchange system according to claim 1, characterized in that: The steam trap is also connected to the cooler for sending the stored condensed water into the cooler.

4. The mold heat exchange system according to claim 1, characterized in that: A valve is provided on the pipeline between the cold and hot fluid delivery pipe and the steam trap, a valve is provided on the pipeline between the cold and hot fluid delivery pipe and the cooler, a valve is provided on the pipeline between the steam generating device and the cold and hot fluid delivery pipe, and a valve is provided on the pipeline between the cooling water delivery pump and the cold and hot fluid delivery pipe.

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