Foam forming mold heat regeneration steam and recovery system and recovery method

Abstract

The invention discloses a foam forming mold heat regeneration steam and recovery system and method, and belongs to the technical field of heat recoverability. A foam forming mold comprises a first mold base and a second mold base, and the first mold base and the second mold base can jointly define a forming mold cavity; the foam forming mold heat regeneration steam and recovery system comprises a steam pressure lifting pump and a first recovery pipeline, the two ends of the first recovery pipeline are connected with a forming mold cavity and the steam pressure lifting pump correspondingly, a first valve body is connected to the first recovery pipeline, and the first valve body is configured to be used for controlling connection and disconnection of the first recovery pipeline and the forming mold cavity; the steam pressure lifting pump is configured to be capable of sucking steam in the forming die cavity through the first recycling pipeline, so that liquid water in the forming die cavity is evaporated to generate steam, the generated steam is guided to a steam using process, the steam is pressurized, and heat recycling of the foaming forming die is achieved.

Description

Technical Field

[0001] This invention relates to the field of heat recovery technology, and in particular to a system and method for regenerating and recovering steam from heat generated by foaming molding molds. Background Technology

[0002] Because of its high enthalpy, steam can rapidly raise the temperature of materials, making it widely used as a heat energy medium in industrial production, drying, and other fields. For example, a large amount of steam is required in the steam heating process for molding foam products.

[0003] The steam heating process for molding foam products includes the following steps: mold closing, material feeding, steam flushing, steam penetration, pressure holding, cooling, and demolding. The mechanism of foam product heating and molding is as follows: the equipment fills the cavity of the foam molding mold with foam plastic beads, and steam is introduced into the cavity through the air holes on the mold. This causes the foam plastic beads to soften and expand upon heating. Within the confines of the mold cavity, the expanded foam plastic beads fill all the gaps. After cooling and setting, the product is demolded to form the foam plastic product.

[0004] In related technologies, during the heating process of foam product molding steam heating process, the foaming mold is heated by steam, but during the cooling process, the heat of the foaming mold is basically not utilized, resulting in waste. Summary of the Invention

[0005] The present invention aims to at least solve the technical problems existing in related technologies. To this end, the present invention proposes a heat regeneration steam recovery system for foaming molding molds, which is beneficial for realizing heat recovery of foaming molding molds.

[0006] The present invention also proposes a recycling method.

[0007] The first aspect of the present invention discloses a heat regeneration and steam recovery system for a foaming molding die, which is applied to a foaming molding die. The foaming molding die includes a first mold base and a second mold base, the first mold base and the second mold base being able to jointly enclose a molding cavity. The heat regeneration and steam recovery system for the foaming molding die includes: a steam pressure boosting pump; a first recovery pipeline, the two ends of which are respectively connected to the molding cavity and the steam pressure boosting pump, a first valve body connected to the first recovery pipeline, the first valve body being configured to control the on / off connection between the first recovery pipeline and the molding cavity, and the steam pressure boosting pump being configured to draw water vapor from the molding cavity through the first recovery pipeline, causing the liquid water in the molding cavity to evaporate and generate water vapor, guiding the generated water vapor to the steam utilization process, and pressurizing the water vapor.

[0008] The heat regeneration and steam recovery system for foam molding molds according to an embodiment of the present invention has at least the following beneficial effects: The system has a first recovery pipeline connected to a first valve body. When steam penetrates the foam molding mold, the foam plastic beads soften and expand, filling the molding cavity of the mold. The temperature of the mold gradually increases, and some water vapor condenses on the inner wall of the molding cavity to form liquid water. When steam penetration ends and the cooling stage begins, the system controls the first valve body to open, connecting the molding cavity to the first recovery pipeline. Then, it controls the operation of a steam pressure boosting pump, and a vacuum pump generates a vacuum in the molding cavity through the first recovery pipeline, thus removing water vapor from the molding cavity through the first recovery pipeline. The system employs a suction method to lower the evaporation point of the liquid water within the molding cavity. This allows the liquid water adhering to the inner wall of the molding cavity to evaporate using the heat of the foaming mold, generating water vapor. This process cools the foaming mold. A steam pressure boosting pump pressurizes the water vapor generated from the evaporation of the liquid water within the molding cavity and guides the generated water vapor to a steam utilization process, thus enabling the reuse of this water vapor. This foaming mold heat regeneration steam recovery system utilizes the heat of the foaming mold to evaporate the liquid water located on the inner wall of the molding cavity through vacuum evaporation. The water vapor is then reused in the steam utilization process, meaning the recovered water vapor can be used in the foam product molding steam heating process itself or in other steam heating processes to achieve heat utilization.

[0009] According to some embodiments of the present invention, the heat regeneration steam recovery system for foaming molding mold further includes a first energy storage device, a steam pressure boosting pump connected to the inlet or outlet end of the first energy storage device, and the two ends of the first recovery pipeline connected to the molding cavity and the first energy storage device respectively. The water vapor in the first energy storage device is used to implement the steam utilization process.

[0010] According to some embodiments of the present invention, a steam pressure boosting pump has a first inlet end connected to a molding cavity and a first outlet end connected to a first energy storage device. The first inlet end is configured to generate a vacuum in the molding cavity and draw water vapor from the molding cavity. The steam pressure boosting pump can pressurize the water vapor generated by the evaporation of liquid water in the molding cavity and introduce it into the first energy storage device through the first outlet end. A vacuum pump is also connected to the first recovery pipeline, and the vacuum pump is connected between the first valve body and the first inlet end.

[0011] According to some embodiments of the present invention, a second energy storage device is also connected to the first recovery pipeline, and the second energy storage device is connected between the first valve body and the vacuum pump.

[0012] According to some embodiments of the present invention, the foaming molding mold heat regeneration steam recovery system further includes a bypass pipeline connected to the molding cavity. A second valve body and a vacuum generator are connected to the bypass pipeline. The second valve body is configured to control the connection and disconnection between the bypass pipeline and the molding cavity. The vacuum generator is configured to draw water vapor from the molding cavity, causing the liquid water in the molding cavity to evaporate and generate water vapor.

[0013] According to some embodiments of the present invention, a third energy storage device is also connected to the bypass pipeline, and the third energy storage device is connected between the second valve body and the vacuum generator.

[0014] According to some embodiments of the present invention, the heat regeneration steam recovery system for foaming molding mold further includes a second recovery pipeline, the two ends of which are connected to the molding cavity and the first energy storage device. A third valve body is connected to the second recovery pipeline, which is configured to control the opening and closing of the molding cavity and the second recovery pipeline. The second recovery pipeline is used to pass the water vapor flowing out of the molding cavity during the steam penetration process into the first energy storage device.

[0015] According to some embodiments of the present invention, the heat regeneration steam recovery system for foaming molding mold further includes an ejector and a reuse pipeline. The ejector has a second inlet end, a third inlet end, and a second outlet end. The two ends of the reuse pipeline are respectively connected to the second inlet end and a first energy storage device. The third inlet end is configured to introduce process heating steam. The second outlet end is connected to the molding cavity. A fourth valve body and a heater are connected to the reuse pipeline. The fourth valve body is configured to control the on / off state of the reuse pipeline and the second inlet end. The heater is configured to heat the water vapor flowing out of the first energy storage device. And / or, the heat regeneration steam recovery system for foam molding dies is applied to multiple foam molding dies, all of which are connected to the first recovery pipeline.

[0016] The recycling method of the second aspect of the present invention is applied to the foaming molding die heat regeneration steam recovery system as described in the first aspect; the recycling method includes: After steam penetration is completed, the first valve body is opened to connect the molding cavity with the first energy storage device; The operation of the steam pressure boosting pump is controlled. The steam pressure boosting pump is configured to create a vacuum in the molding cavity, causing the liquid water in the molding cavity to evaporate and generate water vapor. The steam pressure boosting pump can guide the generated water vapor to the first energy storage device and pressurize the water vapor. The water vapor in the first energy storage device is used to implement the steam utilization process.

[0017] According to some embodiments of the present invention, the heat regeneration steam recovery system for foaming molding mold further includes a second recovery pipeline, the two ends of which are connected to the molding cavity and the first energy storage device, and a third valve body is connected to the second recovery pipeline; Recycling methods also include: During the steam penetration process, the third valve body is opened to connect the molding cavity with the first energy storage device, so as to introduce the water vapor flowing out of the molding cavity during the steam penetration process into the first energy storage device. After steam penetration is completed, the second recovery pipeline is shut off after a preset delay. And / or, the recycling method also includes: During the steam penetration process, the water vapor in the first energy storage device is drawn back into the molding cavity; And / or, after the steam penetration is complete, spray liquid water onto the inner wall of the molding cavity so that the liquid water adheres to the inner wall of the molding cavity.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the layout structure of a heat regeneration and steam recovery system for a foaming molding die according to an embodiment of the present invention; Figure 2 This is a flowchart of a recycling method according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating the recovery of water vapor during the puncture process and the delayed shutdown of the second recovery pipeline in a recovery method according to an embodiment of the present invention; Figure 4 This is a flowchart illustrating the process of spraying water into the molding cavity and drawing back water vapor in a recycling method according to an embodiment of the present invention.

[0020] Icon labels: 100. Foaming molding mold; 110. First mold base; 120. Second mold base; 200. First energy storage device; 310, First recovery pipeline; 320, First valve body; 330, Steam pressure boosting pump; 331, First inlet end; 332, First outlet end; 340, Second energy storage unit; 410. Bypass line; 420. Second valve body; 430. Vacuum generator; 510. Second recovery pipeline; 520. Third valve body; 600, Ejector; 610, Second Inlet; 620, Third Inlet; 630, Second Outlet; 710. Reuse piping; 720. Fourth valve body; 730. Heater; 800, Fifth Valve Body. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] Reference Figure 1 As shown, an embodiment of the present invention discloses a heat regeneration and steam recovery system for a foaming molding die, applied to a foaming molding die 100. The foaming molding die 100 includes a first die base 110 and a second die base 120. The first die base 110 and the second die base 120 can together enclose a molding cavity. The first die base 110 can move closer to or further away from the second die base 120. When the first die base 110 and the second die base 120 are far apart, the molding cavity can be opened to facilitate the removal of the foamed plastic product from the molding cavity. When the first die base 110 and the second die base 120 are close together, they can together enclose the molding cavity. The heat regeneration and steam recovery system for the foaming molding die includes a first energy storage device 200 and a first recovery pipeline 310.

[0026] Reference Figure 1 As shown, the outlet end of the foaming molding mold 100 is connected to a discharge pipe, which is used to discharge liquid water, air and water vapor from the foaming molding mold 100. The first mold base 110 and the second mold base 120 are both connected to the discharge pipe, and the two ends of the first recovery pipe 310 are connected to the discharge pipe and the first energy storage device 200, respectively.

[0027] Reference Figure 1As shown, a first valve body 320 and a steam pressure boosting pump 330 are connected to the first recovery pipeline 310. The first valve body 320 is configured to control the connection and disconnection between the first recovery pipeline 310 and the molding cavity, so that the heat regeneration steam recovery system of the foaming molding mold can be connected to the molding cavity of the foaming molding mold 100 after the steam penetration is completed, while remaining separated during the steam penetration and previous processes.

[0028] Reference Figure 1 As shown, the steam pressure boosting pump 330 has a first inlet end 331 and a first outlet end 332. The first inlet end 331 can generate a vacuum in the molding cavity through the discharge pipeline, and the first outlet end 332 can be connected to the first energy storage device 200.

[0029] Reference Figure 1 As shown, during steam penetration of the foam molding mold 100, the foam plastic beads soften and expand, filling the molding cavity of the foam molding mold 100. Since water vapor is generally introduced from the top of the foam molding mold 100, and the vents and drains of the foam molding mold 100 are typically located at the bottom, according to Avogadro's law, under the same temperature and pressure, gas molecules with the same number of molecules occupy the same volume. Therefore, under the same temperature and pressure, the density of water vapor is lower than that of air. During steam penetration, the water vapor passes through the molding cavity and exits from the bottom of the molding cavity. Because air is denser, it first gathers at the bottom of the molding cavity and then exits. Therefore, after the steam penetration process is completed, the air inside the molding cavity is basically exhausted.

[0030] Reference Figure 1 As shown, during the steam penetration process, the temperature of the foaming mold 100 gradually increases, and some water vapor condenses on the inner wall of the molding cavity to form liquid water or a water film. The foaming mold 100 is generally made of aluminum alloy, and the surface of aluminum alloy is generally an oxide layer. Both the oxide layer and the metal are polar, and water molecules are also polar molecules. Therefore, the surface of aluminum alloy is naturally hydrophilic, and the wetting angle between the liquid and the solid surface is small. The condensate on the inner surface of the molding cavity generally exists in a state of coexistence of water droplets and water film, thus providing a water source for subsequent vacuum evaporation.

[0031] Reference Figure 1As shown, when the steam penetration ends and the cooling stage begins, the heat regeneration steam recovery system of the foaming molding mold can control the opening of the first valve body 320 to connect the molding cavity with the first energy storage device 200. Then, it controls the operation of the steam pressure boosting pump 330 to create a vacuum in the molding cavity at the first inlet end 331, thereby lowering the evaporation point of the liquid water in the molding cavity. This allows the liquid water adhering to the inner wall of the molding cavity to evaporate using the heat of the foaming molding mold 100, generating water vapor. The steam pressure boosting pump 330 can pressurize the water vapor generated by the evaporation of the liquid water in the molding cavity and introduce it into the first energy storage device 200 through the first outlet end 332 to collect this portion of water vapor.

[0032] Reference Figure 1 As shown, specifically, the condensed water droplets or water film adhering to the surface of the foaming mold 100 vaporize under vacuum. The temperature of the water film or water droplets decreases, creating a temperature difference with the surface of the foaming mold 100. The surface of the foaming mold 100 transfers heat to the water droplets or water film, causing the temperature of the foaming mold 100 to decrease. Heat is conducted from the inside of the foaming mold 100 to its inner surface. Through the continuous evaporation and heat absorption of liquid water, the temperature of the foaming mold 100 continuously decreases to reach the cooling temperature for demolding.

[0033] Reference Figure 1 As shown, compared to traditional processes that directly release such gases into the atmosphere, this foaming mold heat regeneration steam recovery system can recover heat from the foaming mold 100 by using the heat of the foaming mold 100 through vacuum evaporation to cause the liquid water on the inner wall of the molding cavity to evaporate.

[0034] The water vapor recovered by the first energy storage unit 200 is used to implement the steam utilization process, that is, the recovered water vapor can be used for the steam heating process of foam product molding or other steam heating processes to realize the utilization of heat.

[0035] Reference Figure 1 As shown, it should be noted that the vacuum referred to in the above embodiments is relative. Generally, the fusion and expansion temperature of foam plastic beads will exceed 100°C, thereby causing the temperature of the foam molding mold 100 to exceed 100°C. At this time, the saturated steam pressure is greater than the atmospheric pressure. When cooling down, the high-temperature water can evaporate to remove the heat from the foam molding mold 100. The main function of the steam pressure boosting pump 330 is to remove water vapor so that the pressure inside the molding cavity can reach the saturated steam pressure value required for the product demolding temperature. The water vapor stored in the first energy storage device 200 can be used for the process itself or other processes.

[0036] It should be understood that in some other embodiments, the steam pressure boosting pump 330 may be located at the outlet end of the first energy storage device 200. The steam pressure boosting pump 330 may pressurize the water vapor generated by the evaporation of liquid water in the molding cavity and guide the generated water vapor through the first energy storage device 200 to enter the steam use process.

[0037] It should be understood that in some other embodiments, the foaming molding mold heat regeneration steam recovery system does not include the first energy storage unit 200, and the two ends of the first recovery pipeline 310 are directly connected to the molding cavity and the steam pressure boosting pump 330.

[0038] Reference Figure 1 As shown, the first recovery pipeline 310 is also connected to a vacuum pump and a second energy storage device 340. The vacuum pump is connected between the first valve body 320 and the first inlet end 331, while the second energy storage device 340 is connected between the first valve body 320 and the vacuum pump. The vacuum pump enhances the vacuum level generated in the molding cavity, assisting the evaporation of liquid water on the surface of the molding cavity using the heat of the foaming mold 100. This results in lower temperatures for the foaming mold 100 and the foamed plastic product, making it suitable for a wider range of foamed plastic products. The second energy storage device 340 helps reduce the impact on the equipment caused by intermittent water vapor delivery.

[0039] Reference Figure 1 As shown, when the first valve body 320 is opened, the water vapor generated in the molding cavity passes through the first valve body 320, the second energy storage device 340, the vacuum pump and the steam pressure boosting pump 330 in sequence before entering the first energy storage device 200.

[0040] Reference Figure 1 As shown, the heat regeneration steam recovery system of the foaming molding mold is connected to the first energy storage unit 200 in sequence through the second energy storage unit 340. If the water vapor contains air, it can be purified at the bottom of the second energy storage unit 340 or the first energy storage unit 200, which is beneficial to improving the separation rate of air and water vapor and reducing the impact on the equipment caused by the intermittent delivery of water vapor.

[0041] Reference Figure 1 As shown, it is understandable that, considering the low demolding temperature of some molded foam products, the pressure of water vapor generated in the molding cavity during the cooling process is too low. Water vapor with too low pressure requires more compression mechanical energy to raise the water vapor to a level that can be recycled for use in the steam penetration process, which results in excessively high recycling costs.

[0042] Reference Figure 1As shown, the foaming molding mold heat regeneration steam recovery system also includes a bypass pipe 410, which is connected to the molding cavity. A second valve body 420 and a vacuum generator 430 are connected to the bypass pipe 410. The second valve body 420 is configured to control the opening and closing of the bypass pipe 410 and the molding cavity. The vacuum generator 430 is configured to generate a vacuum in the molding cavity, causing the liquid water in the molding cavity to evaporate and generate water vapor.

[0043] Reference Figure 1 As shown, the foaming mold heat regeneration steam recovery system is equipped with a bypass pipe 410. For water vapor with excessively low pressure, the foaming mold heat regeneration steam recovery system can close the first valve body 320 and open the second valve body 420, so that the first recovery pipe 310 is separated from the molding cavity, while the bypass branch is connected to the molding cavity. After the vacuum generator 430 is operated, a vacuum can be generated in the molding cavity, so that the liquid water attached to the surface of the molding cavity can be evaporated by the heat of the foaming mold 100 to achieve the cooling of the foaming mold 100. The water vapor generated by evaporation can be directly discharged to the atmosphere from the bypass pipe 410, connected to the drying oven heating, heat exchanger heating, or pre-foaming process.

[0044] Reference Figure 1 As shown, it is understood that a third energy storage device is also connected to the bypass line 410, which is connected between the second valve body 420 and the vacuum generator 430.

[0045] Reference Figure 1 As shown, when low-pressure water vapor flows through the bypass pipe 410, it passes through the second valve body 420, the third energy storage device and the vacuum generator 430 in sequence. The water vapor collected in the third energy storage device can be used in some low-requirement scenarios, or the third energy storage device can recover some of the liquid water generated by the condensation of low-pressure water vapor to achieve water resource recovery.

[0046] Reference Figure 1 As shown, it should be noted that the first energy storage device 200, the second energy storage device 340 and the third energy storage device can all be containers with a receiving cavity, which can be used to contain water vapor to achieve water vapor storage.

[0047] Reference Figure 1 As shown, it should be noted that the vacuum generator 430, the steam pressure boosting pump 330, and the inlet end of the vacuum pump all have vacuum generation capabilities, thereby creating a vacuum in the molding cavity. When the low-pressure water vapor passes through the compression action of the pump body, the water vapor pressure is already greater than atmospheric pressure. At this time, the recovered water vapor can be used for the process itself or for other processes.

[0048] It should be understood that in some other embodiments, the first energy storage device 200, the second energy storage device 340 and the third energy storage device are respectively connected to pressure valves to control the internal pressure of the first energy storage device 200, the second energy storage device 340 and the third energy storage device. For example, the pressure in the first energy storage device 200 can be maintained below the saturated vapor pressure at the same temperature as the foaming molding mold 100 to ensure the water vapor collection capacity of the first energy storage device 200.

[0049] Reference Figure 1 As shown, it can be understood that in this embodiment, the heat regeneration steam recovery system for foaming molding mold also includes a second recovery pipeline 510. The two ends of the second recovery pipeline 510 are connected to the molding cavity and the first energy storage device 200. A third valve body 520 is connected to the second recovery pipeline 510. The third valve body 520 is configured to control the opening and closing of the molding cavity and the second recovery pipeline 510. The second recovery pipeline 510 is used to pass the water vapor flowing out of the molding cavity during the steam penetration process into the first energy storage device 200.

[0050] Reference Figure 1 As shown, the heat regeneration steam recovery system for the foaming molding mold also has a heat recovery function during the steam penetration process. During the steam penetration process, the heat regeneration steam recovery system for the foaming molding mold can control the first valve body 320 and the second valve body 420 to close and the third valve body 520 to open, so that the two ends of the second recovery pipeline 510 are connected to the molding cavity and the first energy storage device 200 respectively, so that the waste steam formed after the process heating steam penetrates the foaming molding mold 100 can be introduced into the first energy storage device 200 along the second recovery pipeline 510 to realize the recovery of the heat energy of the waste steam.

[0051] Reference Figure 1 As shown, it can be understood that the foaming molding mold heat regeneration steam recovery system also includes an ejector 600 and a reuse pipeline 710. The ejector 600 has a second inlet end 610, a third inlet end 620, and a second outlet end 630. The two ends of the reuse pipeline 710 are connected to the second inlet end 610 and the first energy storage unit 200, respectively. The third inlet end 620 is configured to introduce process heating steam, and the second outlet end 630 is connected to the molding cavity. A fourth valve body 720 and a heater 730 are connected to the reuse pipeline 710. The fourth valve body 720 is configured to control the opening and closing of the reuse pipeline 710 and the second inlet end 610. The heater 730 is configured to heat the water vapor flowing out of the first energy storage unit 200 to increase the enthalpy of the water vapor flowing from the first energy storage unit 200 to the ejector 600.

[0052] Reference Figure 1As shown, specifically, the third inlet end 620 is connected to a main pipeline, and a fifth valve body 800 is connected to the main pipeline. The fifth valve body 800 can be used to control the connection and disconnection between the external steam generator and the ejector 600. When the fifth valve body 800 is open, the external steam generator can pass the generated process heating steam into the ejector 600 through the main pipeline. When the fourth valve body 720 is open, the reuse pipeline 710 can be connected to the second inlet end 610. Since the process heating steam has a large pressure and flow rate, the process heating steam passing through the third inlet end 620 can eject the water vapor in the reuse pipeline 710, thereby guiding the water vapor in the first energy storage 200 into the ejector 600 through the reuse pipeline 710. This allows the recovered water vapor to mix with the process heating steam and then pass through the second outlet end 630 into the molding cavity of the foaming mold 100, thereby achieving steam penetration into the foaming mold 100.

[0053] Reference Figure 1 As shown, the heat regeneration steam recovery system for foam molding mold can reuse the recovered water vapor in the steam heating process of foam molding mold 100, which can effectively shorten the water vapor transport path and improve the heat recovery rate.

[0054] Reference Figure 1 As shown, it can be understood that the foaming mold heat regeneration steam recovery system is applied to multiple foaming molds 100, all of which are connected to the first recovery pipeline 310.

[0055] For example, the heat regeneration steam recovery system for foaming molds can be applied to two foaming molds 100. The two foaming molds 100 are independent of each other and can be in different process flows. That is, the heat regeneration steam recovery system for foaming molds can realize the heat recovery of multiple foaming molds 100, which helps to reduce the idle time of the heat regeneration steam recovery system for foaming molds.

[0056] Reference Figure 1 and Figure 2 As shown, one embodiment of the present invention provides a recycling method applied to a foaming molding die heat regeneration steam recovery system as described in any of the above embodiments; the recycling method includes the following steps: In step S100, after the steam penetration is completed, the first valve body 320 is opened to connect the molding cavity with the first energy storage device 200. In step S200, the steam pressure boosting pump 330 is controlled to operate. The steam pressure boosting pump 330 is configured to generate a vacuum in the molding cavity, causing the liquid water in the molding cavity to evaporate and generate water vapor. The steam pressure boosting pump 330 can guide the generated water vapor to the first energy storage unit 200 and pressurize the water vapor. The water vapor in the first energy storage unit 200 is used to implement the steam utilization process.

[0057] Reference Figure 1 and Figure 2 As shown, the foam product molding steam heating process requires heating and cooling of the foam molding mold 100. Heating of the foam molding mold 100 is mainly achieved through the steam penetration process. After the steam penetration process is completed, the foam molding mold 100 needs to be cooled in order to facilitate the demolding of the foam plastic product.

[0058] Reference Figure 1 and Figure 2 As shown, when the steam penetration ends and the cooling stage begins, the recovery method can control the first valve body 320 to open, so that the molding cavity is connected to the first energy storage device 200. Then, the steam pressure boosting pump 330 is controlled to operate, so that the first inlet end 331 creates a vacuum in the molding cavity, thereby lowering the evaporation point of the liquid water in the molding cavity. This allows the liquid water adhering to the inner wall of the molding cavity to evaporate using the heat of the foaming molding mold 100, generating water vapor. The steam pressure boosting pump 330 can pressurize the water vapor generated by the evaporation of the liquid water in the molding cavity and introduce it into the first energy storage device 200 through the first outlet end 332 to collect this water vapor. This recovery method can utilize the heat of the foaming molding mold 100 to promote the evaporation of the liquid water located on the inner wall of the molding cavity through vacuum evaporation, thereby achieving heat recovery of the foaming molding mold 100.

[0059] Reference Figure 1 and Figure 3 As shown, it is understandable that this recycling method also includes the following steps: In step S300, during the steam penetration process, the third valve body 520 is opened to connect the molding cavity with the first energy storage device 200, so as to introduce the water vapor flowing out of the molding cavity during the steam penetration process into the first energy storage device 200.

[0060] In step S400, after the steam penetration is completed, the second recovery pipeline 510 is shut off after a preset delay.

[0061] Reference Figure 1 and Figure 3As shown, the recovery method also has the function of heat recovery during the steam penetration process. During the steam penetration process, the recovery method can control the first valve body 320 and the second valve body 420 to close and the third valve body 520 to open, so that the two ends of the second recovery pipeline 510 are connected to the molding cavity and the first energy storage device 200 respectively, so that the waste steam formed after the process heating steam penetrates the foaming molding mold 100 can be introduced into the first energy storage device 200 along the second recovery pipeline 510 to realize the recovery of the heat energy of the waste steam.

[0062] Reference Figure 1 and Figure 3 As shown, since the waste steam flowing out of the molding cavity during the steam penetration process is generally lower than the steam pressure set for the process penetration, and the internal temperature of the foaming molding mold 100 is higher than the saturation temperature of the waste steam, after the steam penetration process is completed, the second recovery pipe 510 can be closed for a preset time, so that the heat on the foaming molding mold 100 can enter the second recovery pipe 510 as much as possible through the evaporation of liquid water, so as to achieve the purpose of heat recovery.

[0063] Reference Figure 1 and Figure 4 As shown, it is understandable that this recycling method also includes the following steps: In step S500, during the steam penetration process, the water vapor in the first energy storage device 200 is drawn back into the molding cavity.

[0064] Specifically, the third inlet end 620 is connected to a main pipeline, and a fifth valve body 800 is connected to the main pipeline. The fifth valve body 800 can be used to control the connection and disconnection between the external steam generator and the ejector 600. When the fifth valve body 800 is open, the external steam generator can pass the generated process heating steam into the ejector 600 through the main pipeline. When the fourth valve body 720 is open, the reuse pipeline 710 can be connected to the second inlet end 610. Since the process heating steam has a large pressure, the process heating steam passing through the third inlet end 620 can eject the water vapor in the reuse pipeline 710, thereby guiding the water vapor in the first energy storage 200 from the reuse pipeline 710 into the ejector 600. This allows the recovered water vapor to mix with the process heating steam and then pass through the second outlet end 630 into the molding cavity of the foaming mold 100, thereby achieving steam penetration into the foaming mold 100.

[0065] Reference Figure 1 and Figure 4 As shown, this recycling method can reuse the recovered water vapor in the steam heating process of the foaming molding mold 100, which can effectively shorten the water vapor transport path and improve the heat recovery rate.

[0066] Reference Figure 1 and Figure 4As shown, it is understandable that this recycling method also includes the following steps: In step S600, after the steam penetration is completed, liquid water is sprayed onto the inner wall of the molding cavity so that the liquid water adheres to the inner wall of the molding cavity.

[0067] Reference Figure 1 and Figure 4 As shown, considering that condensate on the molding cavity may slide off, i.e., the liquid film or droplets on the inner wall of the molding cavity of the foaming molding mold 100 are not evenly distributed, the heat regeneration steam recovery system of the foaming molding mold can help cool the foaming molding mold 100 by spraying water onto the inner wall of the molding cavity, and make the liquid film on the inner wall of the molding cavity more continuous or uniform, so that more water vapor can be generated during subsequent vacuum evaporation, thereby realizing the heat recovery of the foaming molding mold 100.

[0068] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A heat regeneration and steam recovery system for a foaming molding die, applied to a foaming molding die (100), the foaming molding die (100) comprising a first mold base (110) and a second mold base (120), the first mold base (110) and the second mold base (120) being able to jointly enclose a molding cavity, characterized in that, The heat regeneration and steam recovery system for the foaming molding die includes: Steam pressure boosting pump (330); A first recovery pipeline (310) is connected at both ends to the molding cavity and the steam pressure boosting pump (330), respectively. A first valve body (320) is connected to the first recovery pipeline (310). The first valve body (320) is configured to control the opening and closing of the first recovery pipeline (310) and the molding cavity. The steam pressure boosting pump (330) is configured to draw water vapor in the molding cavity through the first recovery pipeline (310), causing the liquid water in the molding cavity to evaporate and generate water vapor. The generated water vapor is then guided to the steam utilization process and pressurized.

2. The foaming molding mold heat regeneration steam recovery system according to claim 1, characterized in that, It also includes a first energy storage device (200), the steam pressure boosting pump (330) is connected to the inlet or outlet of the first energy storage device (200), the two ends of the first recovery pipeline (310) are respectively connected to the molding cavity and the first energy storage device (200), and the water vapor in the first energy storage device (200) is used to implement the steam use process.

3. The foaming molding mold heat regeneration steam recovery system according to claim 2, characterized in that, The steam pressure boosting pump (330) has a first inlet end (331) connected to the molding cavity and a first outlet end (332) connected to the first energy storage device (200). The first inlet end (331) is configured to generate a vacuum in the molding cavity and draw water vapor from the molding cavity. The steam pressure boosting pump (330) can pressurize the water vapor generated by the evaporation of liquid water in the molding cavity and pass it into the first energy storage device (200) through the first outlet end (332). A vacuum pump is also connected to the first recovery pipeline (310). The vacuum pump is connected between the first valve body (320) and the first inlet end (331).

4. The foaming molding mold heat regeneration steam recovery system according to claim 3, characterized in that, A second energy storage device (340) is also connected to the first recovery pipeline (310), and the second energy storage device (340) is connected between the first valve body (320) and the vacuum pump.

5. The foaming molding mold heat regeneration steam recovery system according to claim 2, characterized in that, It also includes a bypass pipe (410) connected to the molding cavity. A second valve body (420) and a vacuum generator (430) are connected to the bypass pipe (410). The second valve body (420) is configured to control the connection and disconnection between the bypass pipe (410) and the molding cavity. The vacuum generator (430) is configured to draw water vapor from the molding cavity, causing the liquid water in the molding cavity to evaporate and generate water vapor.

6. The foaming molding mold heat regeneration steam recovery system according to claim 5, characterized in that, A third energy storage device is also connected to the bypass pipeline (410), which is connected between the second valve body (420) and the vacuum generator (430).

7. The foaming molding mold heat regeneration steam recovery system according to claim 2, characterized in that, It also includes a second recovery pipeline (510), the two ends of which are connected to the molding cavity and the first energy storage device (200). A third valve body (520) is connected to the second recovery pipeline (510), which is configured to control the opening and closing of the molding cavity and the second recovery pipeline (510). The second recovery pipeline (510) is used to pass the water vapor flowing out of the molding cavity during the steam penetration process into the first energy storage device (200).

8. The foaming molding mold heat regeneration steam recovery system according to claim 2, characterized in that, It also includes an ejector (600) and a reuse pipeline (710). The ejector (600) has a second inlet end (610), a third inlet end (620), and a second outlet end (630). The two ends of the reuse pipeline (710) are respectively connected to the second inlet end (610) and the outlet end of the first energy storage device (200). The third inlet end (620) is configured to introduce process heating steam. The second outlet end (630) is connected to the molding cavity. A fourth valve body (720) and a heater (730) are connected to the reuse pipeline (710). The fourth valve body (720) is configured to control the opening and closing of the reuse pipeline (710) and the second inlet end (610). The heater (730) is configured to heat the steam flowing out of the first energy storage device (200). And / or, the foaming mold heat regeneration steam recovery system is applied to multiple foaming molds (100), all of which are connected to the first recovery pipeline (310).

9. A recycling method, characterized in that, The system is applied to the heat regeneration and steam recovery system for foaming molding dies as described in any one of claims 2 to 8; the recovery method includes: After the steam penetration is completed, the first valve body (320) is opened to connect the molding cavity with the first energy storage device (200); The operation of the steam pressure boosting pump (330) is controlled. The steam pressure boosting pump (330) is configured to generate a vacuum in the molding cavity, causing the liquid water in the molding cavity to evaporate and generate water vapor. The steam pressure boosting pump (330) can guide the generated water vapor to the first energy storage device (200) and pressurize the water vapor. The water vapor in the first energy storage device (200) is used to implement the steam usage process.

10. The recycling method according to claim 9, characterized in that, The foaming molding mold heat regeneration steam recovery system also includes a second recovery pipeline (510), the two ends of which are connected to the molding cavity and the first energy storage device (200), and a third valve body (520) is connected to the second recovery pipeline (510). The recycling method further includes: During the steam penetration process, the third valve body (520) is controlled to open, so that the molding cavity is connected to the first energy storage device (200), and the water vapor flowing out of the molding cavity during the steam penetration process is introduced into the first energy storage device (200). After the steam penetration is completed, the second recovery pipeline (510) is shut off after a preset time delay; And / or, the recycling method further includes: During the steam penetration process, the water vapor in the first energy storage device (200) is drawn back into the molding cavity; And / or, after the steam penetration is completed, liquid water is sprayed onto the inner wall of the molding cavity so that the liquid water adheres to the inner wall of the molding cavity.

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