Heat recovery device for drying charging barrel of injection molding machine
By using the heat recovery device to exchange heat between waste gas and cold air in the injection molding machine drum drying device, the problem of energy waste during the drying process of the injection molding machine is solved, the preheating of cold air is realized, and the energy consumption of drying equipment is reduced. And improves energy utilization.
Patent Information
- Application Number
- CN202420426035.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-05
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-05
AI Technical Summary
During the drying process of existing injection molding machines, the waste gas contains a large amount of waste heat and cannot be effectively utilized, resulting in waste of energy. At the same time, the direct heating of outdoor cold air leads to large energy consumption.
Design a heat recovery device to pass through the filter chamber and the preheating chamber, the dry high-temperature exhaust gas is filtered through the air filter cartridge and then heat exchanged with the cold air in a plate heat exchanger, preheating the cold air to reduce the heating of the drying equipment Energy consumption.
It effectively reduces the energy consumption of drying equipment, improves energy utilization, and protects the heat exchanger through the grille to ensure airflow uniformity and equipment safety.
Smart Images
Figure CN222165608U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hot air recovery of injection molding machines, and more specifically to a heat recovery device used for drying a barrel of an injection molding machine. Background Art
[0002] Injection molding machine is the main molding equipment that uses molding molds to make plastic products of various shapes of thermoplastics or thermosetting plastics. The injection molding machine needs to dry and heat the materials during the material suction and punching process.
[0003] The waste gas after drying of existing injection molding machines is generally discharged directly because it contains impurities. However, the waste gas also contains a large amount of waste heat, resulting in energy waste. The barrel drying of injection molding machines uses outdoor cold air to directly heat to the set temperature, which consumes a lot of energy. Utility Model Content
[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a heat recovery device for drying the barrel of an injection molding machine. The device has the advantage of transferring the filtered and purified high-temperature exhaust gas to cold air through a heat exchanger and waste heat, thereby preheating the cold air and reducing the energy consumption required for heating the drying equipment, thereby achieving energy saving and improving energy utilization.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A heat recovery device for drying a barrel of an injection molding machine comprises a housing, a filter chamber and a preheating chamber are arranged in the housing, an exhaust gas inlet is provided on the filter chamber, a filter device for filtering the exhaust gas is arranged in the filter chamber, and a through hole connected to the preheating chamber is provided on the side wall of the filter chamber;
[0007] The preheating chamber is provided with a cold air inlet, and outdoor cold air is blown into the preheating chamber from the cold air inlet. A heat exchanger is provided in the preheating chamber for heat exchange between the cold air and the filtered exhaust gas. The preheating chamber is also provided with an air supply port and an exhaust gas outlet. The cold air after heat exchange is transported to the injection molding machine from the air supply port, and the exhaust gas is discharged from the exhaust gas outlet.
[0008] The utility model is further configured as follows: the filtering device is an air filter cartridge, and the exhaust gas enters the interior of the air filter cartridge after passing through the exhaust gas inlet.
[0009] The utility model is further configured as follows: the through hole is located at one end of the side wall of the filter cavity close to the exhaust gas inlet.
[0010] The utility model is further configured as follows: the exhaust gas inlet and the air supply port are both provided with connecting pipes, which are convenient for connection with the connecting pipes on the injection molding machine.
[0011] The utility model is further configured as follows: grilles are provided at the cold air inlet and the exhaust gas outlet to protect the heat exchanger.
[0012] The utility model is further configured as follows: the heat exchanger is a plate heat exchanger, and the peripheral side wall of the heat exchanger is in contact with the inner wall of the preheating chamber.
[0013] The utility model is further configured as follows: the bottom end of the heat exchanger is fitted with the grille of the cold air inlet, and there is a distance between the top end and the top wall of the preheating chamber to form a buffer chamber.
[0014] The utility model is further configured as follows: a plurality of hanging ears are arranged on the side wall of the shell body, which are used for installing the shell body on the barrel of the injection molding machine.
[0015] Compared with the prior art, the utility model has at least the following advantages:
[0016] 1. The high-temperature exhaust gas after drying is sent to the exhaust gas inlet of this device. After the dust impurities are filtered out by the air filter cartridge, the waste heat is transferred to the cold air through the heat exchanger and the cold air is exchanged with the heat exchanger. The preheated cold air is sent into the drying equipment to reduce the energy consumption of the drying equipment, thereby achieving the purpose of energy saving and improving energy utilization.
[0017] 2. By setting grilles at the cold air inlet and exhaust gas outlet, outdoor cold air and exhaust gas can enter and exit the preheating chamber normally, while preventing the heat exchanger from being damaged by the outside world.
[0018] 3. A distance is set between the top wall of the preheating chamber and the top of the heat exchanger to form a buffer chamber, making the outlet airflow more uniform. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is an overall schematic diagram of this embodiment;
[0020] Figure 2 1 is an internal structure diagram of this embodiment;
[0021] Figure 3 This is a diagram of the internal structure after the heat exchanger is removed.
[0022] Description of reference numerals:
[0023] 1. Outer shell; 2. Filter chamber; 3. Preheating chamber; 4. Exhaust gas inlet; 5. Through hole; 6. Air supply port; 7. Cold air inlet; 8. Heat exchanger; 9. Exhaust gas outlet; 10. Air filter cartridge; 11. Connecting pipe; 12. Grille; 13. Buffer chamber; 14. Hanging ear. DETAILED DESCRIPTION
[0024] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0025] A heat recovery device for drying the barrel of an injection molding machine, such as Figures 1 to 3 As shown, it includes a shell 1, which is made of spray-coated steel plate or stainless steel plate, has high strength and is easy to manufacture. A filter chamber 2 and a preheating chamber 3 are arranged in the shell 1. An exhaust gas inlet 4 is opened on the top of the filter chamber 2. During drying, high-temperature exhaust gas is discharged from the barrel and enters the filter chamber 2 through the exhaust gas inlet 4. A filter device for filtering exhaust gas is arranged in the filter chamber 2.
[0026] The filtering device of this embodiment is specifically an air filter cartridge 10, which can filter fine plastic rice residues and dust in the exhaust gas. It has a large area, small wind resistance, large dust holding capacity, and long cleaning interval, and there is no need to clean the filter cartridge every day; the air filter cartridge 10 is vertically arranged, and its top and bottom ends are respectively fitted with the filter chamber 2. The top wall of the filter chamber 2 is provided with an annular convex piece, and the top of the air filter element is clamped in the annular convex piece to achieve a positioning effect. The exhaust gas inlet 4 is coaxially arranged with the air filter element, and the exhaust gas enters the interior of the air filter cartridge 10 after passing through the exhaust gas inlet 4.
[0027] A through hole 5 connected to the preheating chamber 3 is provided on the side wall of the filter chamber 2. The exhaust gas filtered from the inside of the air filter cartridge 10 to the side wall is discharged into the preheating chamber 3 through the through hole 5. The through hole 5 is located at one end of the side wall of the filter chamber 2 close to the exhaust gas inlet 4, that is, close to the top of the side wall.
[0028] An air supply port 6 for connecting to the drying equipment is provided at the top of the preheating chamber 3, and a cold air inlet 7 is provided at the end of the preheating chamber 3 away from the air supply port 6, i.e. the bottom end. Outdoor cold air is blown into the preheating chamber 3 from the cold air inlet 7 through the blowing equipment, and is blown out from the air supply port 6 and transported to the drying equipment.
[0029] A heat exchanger 8 is provided in the preheating chamber 3 for heat exchange between the blown-in outdoor cold air and the filtered exhaust gas. The high-temperature exhaust gas transfers the waste heat to the air through the heat exchanger 8, thereby increasing the air temperature and reducing the energy consumption of the drying equipment in heating the air to the required temperature, thereby achieving the purpose of saving energy.
[0030] An exhaust gas outlet 9 is also provided on the side wall of the preheating chamber 3. The high-temperature exhaust gas transfers the residual heat to the air and is discharged from the exhaust gas outlet 9. Grilles 12 are provided at the cold air inlet 7 and the exhaust gas outlet 9 to protect the heat exchanger 8. Outdoor cold air and exhaust gas can enter and exit through the honeycomb holes on the grille 12 to prevent the heat exchanger 8 from being damaged by external factors.
[0031] The heat exchanger 8 of this embodiment is specifically a plate heat exchanger 8, which is composed of a plurality of heat exchange fins. The heat exchange fins are made of 8011 aluminum foil or 304 stainless steel, have high heat transfer efficiency, can be used continuously for a long time, have high temperature resistance, and can be cleaned. The heat exchanger 8 is vertically arranged, and the surrounding side walls of the heat exchanger 8 are in contact with the inner wall of the preheating chamber 3. Outdoor cold air and exhaust gas pass through the gaps between the heat exchange fins.
[0032] The bottom end of the heat exchanger 8 fits with the grille 12 of the cold air inlet 7, and there is a gap between the top end and the top wall of the preheating chamber 3, forming a buffer chamber 13, so that the airflow between the top end of the heat exchanger 8 and the air outlet 6 is more uniform.
[0033] Both the exhaust gas inlet 4 and the air supply outlet 6 are provided with connecting pipes 11, which are convenient for connecting the pipes on the injection molding machine and the drying equipment. The injection molding machine barrel air outlet is connected to the connecting pipe 11 of the exhaust gas inlet 4, and the injection molding machine blower is connected to the connecting pipe 11 of the air supply outlet 6.
[0034] A plurality of hanging ears 14 are arranged on the side wall of the shell. In this embodiment, the hanging ears 14 are specifically arranged as four and arranged in a rectangular shape on the same side wall of the shell. The hanging ears 14 are used to install the shell on the barrel of the injection molding machine.
[0035] The working process of the utility model is as follows:
[0036] During the drying operation, the high-temperature exhaust gas is discharged from the barrel and sent to the exhaust gas inlet 4 of the device. After being filtered by the air filter cartridge 10, it enters the preheating chamber 3. The outdoor cold air enters the preheating chamber 3 through the bottom cold air inlet 7, exchanges heat with the high-temperature exhaust gas through the heat exchanger 8, absorbs heat and is preheated before being sent to the drying equipment through the air supply port 6 by the injection molding machine blower. After reaching the required temperature through the electric heating pipe, it enters the barrel for drying.
[0037] 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 design concept of the present invention should be included in the protection scope of the present invention.
Claims
1. A heat recovery device for drying the barrel of an injection molding machine, characterized in that: The invention comprises a shell, wherein a filter chamber and a preheating chamber are arranged in the shell, an exhaust gas inlet is provided on the filter chamber, a filter device for filtering the exhaust gas is provided in the filter chamber, and a through hole communicating with the preheating chamber is provided on the side wall of the filter chamber; The preheating chamber is provided with a cold air inlet, and outdoor cold air is blown into the preheating chamber from the cold air inlet. A heat exchanger is provided in the preheating chamber for heat exchange between the cold air and the filtered exhaust gas. The preheating chamber is also provided with an air supply port and an exhaust gas outlet. The cold air after heat exchange is transported to the injection molding machine from the air supply port, and the exhaust gas is discharged from the exhaust gas outlet.
2. A heat recovery device for drying the barrel of an injection molding machine according to claim 1, characterized in that: The filtering device is an air filter cartridge, and the exhaust gas enters the interior of the air filter cartridge after passing through the exhaust gas inlet.
3. A heat recovery device for drying a barrel of an injection molding machine according to claim 1, characterized in that: The through hole is located at one end of the filter cavity side wall close to the exhaust gas inlet.
4. A heat recovery device for drying a barrel of an injection molding machine according to claim 1, characterized in that: The exhaust gas inlet and the air supply port are both provided with connecting pipes, which are convenient for connection with the connecting pipes on the injection molding machine.
5. The heat recovery device for drying the barrel of an injection molding machine according to claim 1, characterized in that: The cold air inlet and the exhaust gas outlet are both provided with grilles for protecting the heat exchanger.
6. A heat recovery device for drying a barrel of an injection molding machine according to claim 5, characterized in that: The heat exchanger is a plate heat exchanger, and the peripheral side wall of the heat exchanger is in contact with the inner wall of the preheating chamber.
7. A heat recovery device for drying a barrel of an injection molding machine according to claim 6, characterized in that: The bottom end of the heat exchanger is in contact with the grille of the cold air inlet, and there is a distance between the top end and the top wall of the preheating chamber to form a buffer chamber.
8. The heat recovery device for drying the barrel of an injection molding machine according to claim 1, characterized in that: A plurality of hanging ears are arranged on the side wall of the shell body, which are used to install the shell body on the barrel of the injection molding machine.