CN223803044U

CN223803044U - A cooling device for injection molds

Info

Publication number: CN223803044U
Application number: CN202520400397.7U
Authority: CN
Inventors: 吴道開; 吴荣辉
Original assignee: Shanghai Hengtu Plastic Technology Co ltd
Current assignee: Shanghai Hengtu Plastic Technology Co ltd
Priority date: 2025-03-10
Filing date: 2025-03-10
Publication date: 2026-01-16
Anticipated expiration: 2035-03-10

Abstract

This utility model discloses a cooling device for an injection mold, including a compressor, a condenser, an expansion valve, an evaporator, and a cooling pipeline for the injection mold. The inlet of the cooling pipeline is connected to the outlet of the evaporator. A first heat exchanger and a second heat exchanger are installed between the compressor outlet and the condenser inlet. The first heat exchanger includes a first outer shell, inside which a spiral coil is installed. One end of the spiral coil is connected to the high-temperature, high-pressure refrigerant gas at the compressor outlet, and the other end is connected to the condenser inlet. The top of the first outer shell is connected to the outlet of the cooling pipeline for the injection mold. The second heat exchanger includes a second outer shell, at the top of which a heat exchange fan is installed. A heat dissipation pipe is fixed inside the second outer shell, one end of which is connected to the first outer shell, and the other end is connected to the evaporator return outlet. The bottom of the second outer shell is connected to a heating duct.

Description

Cooling device of injection mold

Technical Field

The utility model belongs to the technical field of injection mold auxiliary equipment, and particularly relates to a cooling device of an injection mold.

Background

In the injection molding process, temperature control of the injection mold plays a key role in quality and production efficiency of plastic products. The traditional injection mold cooling mode mainly relies on a water chiller to cool, and the heat generated by the mold is taken away by circulating cold water, so that the mold is ensured to work in a proper temperature range. However, the existing cold water machine for cooling the injection mold has a certain problem in the operation process.

From the aspect of energy utilization, the cold water machine takes away the heat of the die and simultaneously, a large amount of waste heat is directly discharged into the environment, so that the energy is wasted greatly. Especially in winter, factories often require additional energy consumption for heating. However, the temperature of the waste heat of the water chiller is basically 30-50 degrees, so that the heating requirement is difficult to meet, and the operation requirement of the existing heating system is difficult to be matched accurately. In view of the above, there are many disadvantages in waste heat utilization of the conventional cooling water chiller for cooling injection mold, and there is an urgent need for a cooling device for injection mold, which can effectively solve the above problems and realize efficient collaborative operation of cooling injection mold and waste heat recovery and heating.

Disclosure of utility model

The cooling device of the injection mold comprises a compressor, a condenser, an expansion valve, an evaporator and an injection mold cooling pipeline, wherein a water inlet of the injection mold cooling pipeline is connected with a water outlet of the evaporator, a first heat exchanger and a second heat exchanger are arranged between an outlet of the compressor and an inlet of the condenser, the first heat exchanger comprises a first shell, a spiral coil is arranged in the first shell, one end of the spiral coil is connected with high-temperature high-pressure refrigerant gas at the outlet of the compressor, the other end of the spiral coil is connected with the inlet of the condenser, the top of the first shell is connected with a water outlet of the injection mold cooling pipeline, the second heat exchanger comprises a second shell, a heat exchange fan is arranged at the top of the second shell, a heat dissipation pipe is fixed in the second shell, one end of the heat dissipation pipe is connected with a first shell, the other end of the heat dissipation pipe is connected with a water return port of the evaporator, and the bottom end of the second shell is connected with a heating air pipe.

As a preferable technical scheme of the utility model, the surface of the radiating pipe body is uniformly welded with radiating fins.

As a preferable technical scheme of the utility model, the spiral coil is in a spiral structure and is made of pure copper.

As a preferable technical scheme of the utility model, the high-temperature high-pressure refrigerant gas is R134a or R410A refrigerant.

As a preferable technical scheme of the utility model, a water quality filter is arranged between the water outlet of the injection mold cooling pipeline and the first heat exchanger, and the water quality filter is of a detachable filter element structure.

As a preferable technical scheme of the utility model, a frame is arranged outside the first heat exchanger and the second heat exchanger of the compressor, the condenser, the expansion valve, the evaporator and the cooling pipeline of the injection mold, and a universal wheel with a brake is arranged at the bottom of the frame.

Compared with the prior art, the utility model has the beneficial effects that the unique double-heat exchanger design combines the refrigerant waste heat originally directly discharged into the environment with the waste heat in the cooling pipeline of the injection mold, thereby providing a heat source for heating in winter. The unnecessary waste of energy sources is avoided, the cascade utilization of the energy sources is realized, and the total energy consumption of the factory in refrigeration and heating is greatly reduced. Compared with the traditional injection mold cooling system and an independent heating system, the injection mold cooling system can remarkably reduce energy consumption and operation cost. The spiral coil pipe is in a spiral structure, so that the heat exchange area is greatly increased, and the heat exchange efficiency is effectively improved. In the condensation process of the refrigeration cycle, the heat of the refrigerant can be transferred to the cooling water more quickly, the working load of the compressor is reduced, and the electric energy consumption is further reduced.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic cross-sectional view of a frame according to the present utility model;

The device comprises a compressor, a condenser, an expansion valve, an evaporator, an injection mold cooling pipeline, a first shell, a spiral coil, a second shell, a heat exchange fan, a heat dissipation pipe, a heating air pipe, a heat dissipation fin, a water quality filter, a frame and a universal wheel with a brake, wherein the heat dissipation pipe comprises the components of the compressor, the condenser, the expansion valve, the evaporator, the injection mold cooling pipeline, the first shell, the spiral coil, the second shell, the heat exchange fan, the heat dissipation pipe, the heating air pipe, the heat dissipation fin, the water quality filter, the frame and the universal wheel with the brake.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples

Referring to fig. 1-2, the utility model provides a cooling device of an injection mold, which comprises a compressor 1, a condenser 2, an expansion valve 3, an evaporator 4 and an injection mold cooling pipeline 5, wherein a water inlet of the injection mold cooling pipeline 5 is connected with a water outlet of the evaporator 4, a first heat exchanger and a second heat exchanger are arranged between an outlet of the compressor 1 and an inlet of the condenser 2, the first heat exchanger comprises a first shell 6, a spiral coil 7 is arranged in the first shell 6, one end of the spiral coil 7 is connected with high-temperature high-pressure refrigerant gas at the outlet of the compressor 1, the other end of the spiral coil 7 is connected with the inlet of the condenser 2, the top of the first shell 6 is connected with a water outlet of the injection mold cooling pipeline 5, the second heat exchanger comprises a second shell 8, a heat exchange fan 9 is arranged at the top of the second shell 8, a heat exchange tube 10 is fixed in the second shell 8, one end of the heat exchange tube 10 is connected with the first shell 6, the other end of the heat exchange tube 10 is connected with a water return port of the evaporator 4, and the bottom of the second shell 8 is connected with a heating air pipe 11.

In order to increase the surface area of the radiating tube 10 and increase the heat exchange amount, in this embodiment, as a preferred technical scheme of the present utility model, the radiating fins 12 are uniformly welded on the surface of the body of the radiating tube 10.

In order to increase the length of the heat exchange path of the pipe body and improve the heat exchange efficiency, in this embodiment, as a preferred technical scheme of the present utility model, the spiral coil 7 is in a spiral structure, and is made of pure copper.

In order to avoid insufficient heating capacity caused by using a low-temperature refrigerant, in this embodiment, as a preferred technical scheme of the present utility model, the high-temperature and high-pressure refrigerant gas is R134a or R410A refrigerant, and R134a or R410A is a common industrial refrigerant, and its high-temperature characteristic (70 ℃ to 100 ℃) can ensure that the heat exchanger effectively increases the water temperature.

In order to filter rust and impurities in cooling water and prevent the heat exchanger from being blocked, in this embodiment, as a preferred technical scheme of the utility model, a water quality filter 13 is installed between a water outlet of the injection mold cooling pipeline 5 and the first heat exchanger, and the water quality filter 13 is of a detachable filter element structure.

In order to facilitate the rapid movement of equipment at different workshop positions and adapt to production line adjustment, in this embodiment, as a preferred technical scheme of the utility model, a frame 14 is installed at the outer sides of a compressor 1, a condenser 2, an expansion valve 3, an evaporator 4, an injection mold cooling pipeline 5, a first heat exchanger and a second heat exchanger, and a universal wheel 15 with a brake is installed at the bottom of the frame 14.

In summary, by means of the above technical solution of the present utility model, during the operation of the injection mold cooling device, the working principle thereof covers two key parts of refrigeration cycle and waste heat recovery and utilization.

Principle of operation of refrigeration cycle

The compressor 1 is used as a power source of refrigeration cycle, sucks low-temperature low-pressure gaseous refrigerant, compresses the gaseous refrigerant through mechanical work, converts the gaseous refrigerant into high-temperature high-pressure refrigerant gas, and the temperature is usually 70-100 ℃ depending on the type of the refrigerant and the compression ratio, and the pressure is also greatly increased correspondingly. In the process, the compressor consumes electric energy to provide energy for the circulation flow of the refrigerant, so that the refrigerant has the capability of releasing heat subsequently.

In the condensation process, high-temperature and high-pressure refrigerant gas discharged from the compressor 1 firstly enters the first heat exchanger. In the first heat exchanger, the high-temperature and high-pressure refrigerant gas exchanges heat through the spiral coil 7. The spiral coil 7 is in a spiral structure, and a brazing copper pipe material is adopted, so that the heat exchange area can be effectively increased, and the heat exchange efficiency can be improved. The cooling water flowing out of the injection mold cooling pipeline 5 enters from the top of the first shell 6 at the temperature of 30-50 ℃ and exchanges heat with the high-temperature high-pressure refrigerant gas in the spiral coil 7. In the heat exchange process, the heat of the refrigerant gas is transferred to the cooling water, the temperature of the cooling water is reduced, the cooling capacity of the condenser 2 is reduced because of insufficient heat dissipation caused by 'robbing away' excessive heat in the refrigerant, 20% -30% of the heat of the extracted refrigerant is required to be determined through thermodynamic calculation through customizing the heat exchange path length of the spiral coil 7, and the residual heat is still discharged by the condenser 2, so that the normal refrigeration cycle is ensured. Then, the refrigerant subjected to preliminary cooling and partial condensation continuously flows into the condenser 2, and is subjected to heat exchange with the external environment in the condenser 2 to complete the whole condensation process, so that the refrigerant becomes a liquid refrigerant.

And in the throttling process, liquid refrigerant from the condenser 2 is throttled and depressurized through the expansion valve 3. The expansion valve 3 reduces the pressure of the liquid refrigerant in a short time by controlling the opening degree of the valve, and the temperature of the refrigerant is reduced along with the pressure reduction, so that the liquid refrigerant becomes a low-temperature low-pressure gas-liquid mixed refrigerant.

The evaporation process is that the low-temperature low-pressure gas-liquid mixed refrigerant enters the evaporator 4, and the refrigerant exchanges heat with water in the injection mold cooling pipeline 5 in the evaporator 4. Because the temperature of the refrigerant is lower than that of the water in the injection mold cooling pipeline 5, heat is transferred to the refrigerant from the cooling water, so that the refrigerant evaporates into a gaseous state after absorbing the heat, and the temperature of the cooling water is reduced, thereby realizing the cooling effect on the injection mold. The gaseous refrigerant is again sucked into the compressor 1, and a new refrigeration cycle is started.

Working principle of waste heat recovery and utilization

The first heat exchange is performed by exchanging heat between the cooling water flowing out of the mold cooling line 5 and the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 in the first heat exchanger, as described in the condensation process in the refrigeration cycle. The temperature of the cooling water is further increased from 30-50 ℃ to 50-70 ℃, the heat of the refrigerant which is originally lost to the environment is effectively utilized, the temperature of the cooling water is increased, and a heat source with more proper temperature is provided for subsequent heating.

And the second heat exchange is that the hot water after the temperature rise of the first heat exchanger flows into the radiating pipe 10 of the second heat exchanger. The radiating fins 12 are uniformly welded on the surface of the tube body of the radiating tube 10, so that the contact area between the radiating tube 10 and air is greatly increased, and the radiating efficiency is improved. At the top end of the second shell 8, the heat exchange fan 9 continuously works to suck the external cold air from the heating air pipe 11 at the bottom end of the second shell 8. When flowing through the radiating pipe 10, the cold air exchanges heat with hot water in the pipe, absorbs heat of the hot water, and then increases in temperature, and becomes hot air to be blown out from the heating air pipe 11 for heating in winter. And the hot water in the radiating pipe 10 is reduced in temperature after releasing the heat, flows back to the water return port of the evaporator 4 and is re-participated in the cooling cycle of the injection mold.

The auxiliary structure ensures that a water filter 13 is arranged between the water outlet of the injection mold cooling pipeline 5 and the first heat exchanger, and the water filter 13 is of a detachable filter element structure. The device can effectively filter impurities in the cooling water, prevent the impurities from entering the heat exchanger, avoid blocking pipelines and affecting heat exchange efficiency, and ensure stable operation of the whole system. Simultaneously, frame 14 is installed in compressor 1, condenser 2, expansion valve 3, evaporimeter 4, injection mold cooling pipeline 5 first heat exchanger and second heat exchanger outside, and universal wheel 15 is stopped in the area to frame 14 bottom installation, and the convenient equipment's of facilitating the removal and fixed is convenient for use in a flexible way in different working scenarios.

Finally, it should be noted that, in the present utility model, unless explicitly specified and limited otherwise, terms such as "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, and may be a communication between two elements or an interaction relationship between two elements, unless explicitly specified otherwise, and it will be understood by those of ordinary skill in the art that the above terms are in the specific meaning of the present utility model as appropriate.

The foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A cooling device for an injection mold, comprising a compressor (1), a condenser (2), an expansion valve (3), an evaporator (4), and an injection mold cooling pipeline (5), wherein the inlet of the injection mold cooling pipeline (5) is connected to the outlet of the evaporator (4), characterized in that: a first heat exchanger and a second heat exchanger are installed between the outlet of the compressor (1) and the inlet of the condenser (2), the first heat exchanger comprising a first outer shell (6), a spiral coil (7) being installed inside the first outer shell (6), one end of the spiral coil (7) being connected to the high outlet of the compressor (1). High-temperature and high-pressure refrigerant gas, the other end of the spiral coil (7) is connected to the inlet of the condenser (2), the top of the first shell (6) is connected to the outlet of the injection mold cooling pipe (5), the second heat exchanger includes a second shell (8), a heat exchange fan (9) is installed at the top of the second shell (8), a heat dissipation pipe (10) is fixed inside the second shell (8), one end of the heat dissipation pipe (10) is connected to the first shell (6), the other end of the heat dissipation pipe (10) is connected to the return water port of the evaporator (4), and the bottom end of the second shell (8) is connected to a heating air pipe (11).

2. The cooling device for an injection mold according to claim 1, characterized in that: heat dissipation fins (12) are uniformly welded on the surface of the heat dissipation pipe (10).

3. The cooling device for an injection mold according to claim 1, characterized in that: the spiral coil (7) has a spiral structure and is made of pure copper.

4. The cooling device for an injection mold according to claim 1, wherein the high-temperature and high-pressure refrigerant gas is R134a or R410A refrigerant.

5. A cooling device for an injection mold according to claim 1, characterized in that: a water filter (13) is installed between the outlet of the injection mold cooling pipe (5) and the first heat exchanger, and the water filter (13) is a detachable filter element structure.

6. A cooling device for an injection mold according to claim 1, characterized in that: a frame (14) is installed on the outside of the compressor (1), condenser (2), expansion valve (3), evaporator (4), and injection mold cooling pipeline (5), the first heat exchanger and the second heat exchanger, and a universal wheel (15) with brake is installed at the bottom of the frame (14).