Ceramic shell drying device, system and method for casting

Abstract

In order to overcome the defects in the prior art, the invention provides a ceramic shell drying device, system and method for casting. The ceramic shell drying device for casting comprises a drying cavity, an air blowing cavity and an equipment cabin which are isolated from one another. An air inlet is formed in the side wall of the drying cavity, inlet air is filtered through a filtering mechanism, and a condensation dryer is arranged at the position, close to the air inlet, in the drying cavity. A heater is arranged on the partition plate between the drying cavity and the air blowing cavity, and air flow between the drying cavity and the air blowing cavity is communicated through the heater. And an air blower for blowing out air in the air blowing cavity is mounted on the side wall of the air blowing cavity. The system comprises a ceramic shell drying device for casting, a humidifier and various types of sensors. The method comprises special temperature and humidity control during surface layer drying. According to the ceramic shell drying device for casting, the problems of cold discharge freezing and cleaning of the ceramic shell drying device for casting are solved, and the problem that the large-scale ceramic shell drying frequency is poor in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of precision casting, and in particular to a ceramic shell drying device, system and method for casting. Background Art

[0002] Lost wax precision casting is the most commonly used precision casting method. This method first uses a wax mold to make a hollow model of the desired product, and then covers it with ceramic to form an integral ceramic shell. Subsequently, the wax mold is melted and flows out by heating, leaving a cavity, and then the metal is injected into the ceramic shell. After the metal cools and solidifies, the product is finally obtained. The advantage of lost wax precision casting is that it can produce complex structures and high-precision parts, and is suitable for casting various metal materials. However, there are high requirements for the manufacture of ceramic shells. Insufficient support or insufficient precision of the ceramic shell or cracks in the surface layer will affect the accuracy of the casting.

[0003] The existing technology generally uses a vacuum rapid dryer to dry the ceramic shells. Its advantages are fast drying speed and high quality of ceramic shells, but it is limited by the volume of the drying chamber of the dryer, and the number of ceramic shells that can be dried in each batch is limited. Therefore, large-scale casting companies still use natural drying in a relatively high temperature and low humidity drying room. Although this method takes a long time to dry each batch, the number of ceramic shells that can be dried is significantly increased, and the limit on the size of the ceramic shells is significantly lower than that of the vacuum rapid dryer. The drying device is the main core equipment in this method.

[0004] Existing drying devices generally use a cold row to condense and dry the air that flows into the drying chamber from the outside, and then use a heater to heat the condensed and dried air to the target temperature, and then blow the dry hot air into the drying chamber, so as to control the temperature and humidity of the drying chamber environment and dry the ceramic shell. However, most existing drying devices use a semi-automatic cleaning method that regularly cleans the cold row of debris or a method that cleans the cold row after manual judgment, which often leads to problems of untimely cleaning or excessive cleaning. Untimely cleaning will seriously affect the condensation and drying effect of the cold row, affect the smoothness of the cold row ventilation, and lead to a series of problems such as increased operating power of the blower or cold row compressor. Excessive cleaning wastes water resources and electricity.

[0005] In addition, the existing drying device cannot effectively solve the problem of radiator icing, which can lead to a series of problems, including:

[0006] 1. Obstruct airflow, causing the blower to run at a higher power to ensure the air volume.

[0007] 2. The refrigerant in the radiator cannot absorb enough heat, resulting in a decrease in the cooling effect, affecting the cooling and dehumidification effects, or causing the compressor operating power to increase.

[0008] 3. If the ice layer is not cleaned in time, it will gradually accumulate. On the one hand, it will cause additional stress to the radiator pipeline due to the expansion of the ice layer. On the other hand, the accumulated ice layer will cause the pipeline itself to bear more pressure (the weight of the ice layer), thus affecting the service life of the pipeline. Summary of the invention

[0009] In order to solve the deficiencies of the prior art, the present invention provides a ceramic shell drying device for casting, comprising a mutually isolated drying chamber, a blast chamber and an equipment cabin. An air inlet is provided on the side wall of the drying chamber, and the incoming air is filtered by a filtering mechanism. A condensing dryer is provided near the air inlet in the drying chamber. A heater is provided on the partition between the drying chamber and the blast chamber, and the airflow between the drying chamber and the blast chamber is connected through the heater. A blower is installed on the side wall of the blast chamber to blow out the gas in the blast chamber.

[0010] The condensation dryer comprises: a compressor, a first tubular heat exchanger, an expansion valve, and a cold row arranged in a tube row manner. The cold row is arranged along the cross-sectional direction of the main flow direction of the airflow inside the drying chamber.

[0011] The outlet end of the compressor is connected to the inlet end of the first tubular heat exchanger, the outlet end of the first tubular heat exchanger is connected to the inlet end of the expansion valve, the outlet end of the expansion valve is connected to the inlet end of the cold row, and the outlet end of the cold row is connected to the inlet end of the compressor.

[0012] The operation status of the condensing dryer, heater and blower is controlled by a control system.

[0013] Furthermore, the filtering mechanism is a 250-400 mesh felt filter or a metal filter.

[0014] Furthermore, the heat pipe inlet of the first tubular heat exchanger is connected to the outlet of the compressor through a first connecting pipe, and the heat pipe outlet is connected to the inlet of the expansion valve through a second connecting pipe. The coolant inlet of the first tubular heat exchanger is connected to an external liquid supply device through a third connecting pipe, and the coolant outlet is connected to an external liquid storage device through a fourth connecting pipe. A first booster pump is provided on the third connecting pipe.

[0015] Furthermore, the external liquid supply device and the external liquid storage device are a first liquid storage tank, the third connecting pipe is connected to the bottom of the first liquid storage tank, and the fourth connecting pipe is connected to the top of the first liquid storage tank. The first liquid storage tank is installed inside the equipment cabin or outside the ceramic shell drying device for casting.

[0016] Furthermore, a first three-way valve is provided between the first booster pump and the first tubular heat exchanger, wherein the inlet of the first three-way valve is connected to the outlet of the first booster pump, one outlet is connected to the fourth connecting pipe, and the other outlet is connected to the coolant inlet of the first tubular heat exchanger.

[0017] Furthermore, the first three-way valve is an electrically controlled three-way valve, and the control signal receiving end of the first three-way valve is connected to the control system signal. An ambient temperature sensor is provided outside the ceramic shell drying device for casting, and the ambient temperature sensor sends the ambient temperature outside the ceramic shell drying device for casting to the control system in real time. The control system controls the flow ratio between the two passages of the first three-way valve according to the temperature information sent by the ambient temperature sensor.

[0018] Furthermore, a first electronic thermometer is provided at the inlet end of the expansion valve, and the control system receives temperature information Y of the first electronic thermometer in real time and makes the following judgment:

[0019] When Y∈U, the flow ratio between the two passages of the current first three-way valve is maintained.

[0020] when And if Y is greater than Tmax, the first three-way valve is controlled to increase the flow to the first tubular heat exchanger.

[0021] when And Y is less than Tmin, the first three-way valve is controlled to reduce the flow to the first tubular heat exchanger.

[0022] U is a preset temperature range, Tmax is the maximum value of U, and Tmin is the minimum value of U.

[0023] Furthermore, a second tubular heat exchanger (105) is provided between the first tubular heat exchanger and the expansion valve.

[0024] The second tubular heat exchanger includes a heat dissipation pipe, the inlet end of the heat dissipation pipe is connected to the outlet end of the first tubular heat exchanger through a fifth connecting pipe, and the outlet end of the heat dissipation pipe is connected to the inlet end of the expansion valve through a sixth connecting pipe.

[0025] Furthermore, the second tubular heat exchanger further includes: a heat exchange exhaust pipe, and the heat exchange exhaust pipe is arranged close to the heat dissipation exhaust pipe.

[0026] A second three-way valve is provided between the compressor and the first tubular heat exchanger, the inlet end of the second three-way valve is connected to the outlet end of the compressor, one outlet end is connected to the inlet end of the first tubular heat exchanger, and the other outlet end is connected to the inlet end of the heat exchange exhaust pipe through the seventh connecting pipe. The outlet end of the heat exchange exhaust pipe is connected to the inlet end of the first tubular heat exchanger through the eighth connecting pipe.

[0027] Furthermore, the second three-way valve is an electrically controlled three-way valve, and the control signal receiving end of the second three-way valve is connected to the control system signal. An ambient temperature sensor is provided outside the ceramic shell drying device for casting, and the ambient temperature sensor sends the ambient temperature outside the ceramic shell drying device for casting to the control system in real time. The control system controls the flow ratio between the two passages of the second three-way valve according to the temperature information sent by the ambient temperature sensor.

[0028] Furthermore, the partition is provided with a cleaning system at the position of the cold row, and the cleaning system includes: a spray plate arranged on the top of the cold row and covering the cold row, and a supporting drainage plate arranged at the bottom of the cold row.

[0029] The spray plate is provided with a plurality of spray holes on one side facing the radiator, and all the spray holes are connected to a water washing pipe. The water washing pipe is connected to a liquid supply pipe through a second booster pump, and the liquid supply pipe is connected to a cleaning water storage mechanism.

[0030] The supporting drainage plate is provided with a liquid collecting tank at the position of the cold row, and the bottom of the cold row is straddled with the supporting drainage plate fixed on both sides of the liquid collecting tank. The bottom of the liquid collecting tank is connected to the external water treatment mechanism through a drainage pipe.

[0031] The control signal input end of the second booster pump is connected to the control system signal, and the control system controls the start-up of the second booster pump according to the analysis result of the washing and cooling radiator analysis.

[0032] Furthermore, a first anemometer and a second anemometer are respectively provided on both sides of the cold row along the airflow direction in the drying chamber.

[0033] The cold row washing analysis includes: flow rate difference analysis, and the flow rate difference analysis includes:

[0034] Step 1.1: Receive in real time a first wind speed S1 of a first anemometer and a second wind speed S2 of a second anemometer.

[0035] Step 1.2 Calculate the wind speed difference C = S1 - S2.

[0036] Step 1.3: When C≥K1, it is determined that the radiator needs to be washed, and the second booster pump is started. K1 is a preset flow rate difference threshold.

[0037] Furthermore, a second electronic thermometer is provided at the outlet of the cold row to detect the temperature of the refrigerant at the end of the cold row and send the detection result to the control system.

[0038] The cold row washing analysis includes: cold row temperature analysis, and the cold row temperature analysis includes:

[0039] Step 2.1: Receive temperature information T from the second electronic thermometer in real time.

[0040] Step 2.2: When T≤K2, it is determined that the cold row needs to be washed, and the second booster pump (502) is started. K2 is a preset temperature threshold.

[0041] Furthermore, an electronic barometer is provided at the inlet end of the compressor for detecting the refrigerant pressure at the inlet end of the compressor and sending the detection result to the control system.

[0042] The radiator washing analysis includes: refrigerant pressure analysis, and the refrigerant pressure analysis includes:

[0043] Step 3.1 Receive the pressure information P from the electronic barometer in real time.

[0044] Step 3.2: When P≤K3, it is determined that the radiator needs to be washed, and the second booster pump is started. K3 is a preset pressure threshold.

[0045] Further, the washing and cooling row analysis includes: timing analysis, and the timing analysis includes:

[0046] Step 4.1 Obtain current time information N in real time.

[0047] Step 4.2: When N∈M, it is determined that the cold row needs to be washed, and the second booster pump is controlled to start. M is a set of preset time points.

[0048] Furthermore, a plurality of jet heads are arranged along one side of the cold row, and the jet direction of the jet heads is tilted downward toward the cold row, and all the jet heads are connected to the output end of the air compressor respectively.

[0049] At this time, the control system controls the second booster pump to be started for a first preset time and then turned off, and the air compressor to be started for a preset second time and then turned off.

[0050] In addition, the present invention provides a ceramic shell drying system for casting, comprising: at least one of the above-mentioned ceramic shell drying devices for casting installed in a drying area, at least one humidifier, several temperature sensors and humidity sensors located at different positions, and a drying control system connected to the signals of the ceramic shell drying device for casting, the humidifier, the temperature sensor and the humidity sensor.

[0051] The drying control system receives temperature information from the temperature sensor and humidity information from the humidity sensor, and controls the humidifier and the ceramic shell drying device according to preset conditions to control the temperature and humidity in the drying area.

[0052] Furthermore, the drying area is a drying room or a drying cavity of a drying device.

[0053] In addition, the present invention also provides a ceramic shell drying method, which uses the above-mentioned ceramic shell drying system for casting to dry the ceramic shell to be dried.

[0054] Furthermore, when drying the ceramic shell, the following steps are performed:

[0055] When the surface layer of the ceramic shell to be dried is dried, the humidity in the drying area is controlled to be 70-90% and the temperature is 20-24°C.

[0056] When the second layer of the ceramic shell to be dried is dried, the humidity in the drying area is controlled to be 50-70% and the temperature is 22-26°C.

[0057] When the third layer of the ceramic shell to be dried is dried, the humidity in the drying area is controlled to be 40-50% and the temperature is controlled to be 22-26°C.

[0058] When drying the fourth and subsequent ceramic shell layers of the ceramic shell to be dried, the humidity in the drying area is controlled to be 30-40% and the temperature is controlled to be 22-26°C.

[0059] Furthermore, when the surface layer or the surface layer and the second layer of the ceramic shell to be dried are dried, the air flow velocity in the drying area is controlled so that the difference between the dry-bulb temperature and the wet-bulb temperature does not exceed 2°C.

[0060] The present invention has at least one of the following beneficial effects:

[0061] 1. The present invention changes the existing cooling method for high-temperature and high-pressure refrigerant liquid. On the one hand, the refrigerant pipe can be installed as a whole inside the device, effectively reducing the refrigerant pipe length and significantly reducing the restrictions on the equipment installation location. On the other hand, the temperature of the refrigerant entering the radiator can be relatively stable and less affected by the ambient temperature, so that the temperature of the radiator tends to be stable, significantly improving the stability of condensation drying.

[0062] 2. The ceramic shell drying device of the present invention can effectively prevent the problem of icing of the radiator, thereby solving the problem of unstable drying effect caused by icing of the radiator.

[0063] 3. The present invention adopts a self-designed radiator washing identification and control method, which can realize automatic cleaning control of the radiator to avoid icing of the radiator or excessive dust and debris attached to the radiator.

[0064] 4. The present invention improves the structure of the condensing dryer so that the temperature of the refrigerant entering the radiator can be controlled within a controlled range, thereby effectively avoiding the problem of radiator icing caused by too low a refrigerant temperature and reducing the energy consumption of heating the radiator in winter.

[0065] 5. The present invention can significantly improve the drying yield rate of ceramic shells in large-scale drying through the improved ceramic shell drying method. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1It is a structural schematic diagram of a ceramic shell drying device for casting of the present invention;

[0067] Figure 2 It is a structural schematic diagram of a condensation dryer of the present invention;

[0068] Figure 3 It is a structural schematic diagram of the first tubular heat exchanger of the present invention;

[0069] Figure 4 It is a structural schematic diagram of another condensation dryer of the present invention;

[0070] Figure 5 This is a schematic structural diagram of another condensation dryer of the present invention;

[0071] Figure 6 It is a structural schematic diagram of the second tubular heat exchanger of the present invention;

[0072] Figure 7 It is a structural schematic diagram of the cleaning system of the present invention;

[0073] Figure 8 It is a structural schematic diagram of the spray plate of the present invention;

[0074] Fig. 9 This is a schematic diagram of the structure of the supporting drainage plate of the present invention;

[0075] Fig.10 This is a schematic diagram of the installation positions of the first anemometer and the second anemometer of the present invention;

[0076] Fig.11 This is a schematic diagram of a ceramic shell drying system for casting according to the present invention;

[0077] In the figure:

[0078] 1. Condensation dryer; 101. Compressor; 102. First tubular heat exchanger; 1021. Fourth connecting pipe; 1022. Third connecting pipe; 1023. First connecting pipe; 1024. Second connecting pipe; 1025. First booster pump; 1026. First three-way valve; 103. Expansion valve; 104. Cooling row of tube arrangement; 105. Second tubular heat exchanger; 1051. Heat dissipation row pipe; 1052. Fifth connecting pipe; 1053. Sixth connecting pipe; 1054. Heat exchange row pipe; 105 5. Eighth connecting pipe; 1056. Seventh connecting pipe; 106. Second three-way valve; 2. Heater; 3. Blower; 4. Partition; 5. Cleaning system; 501. Liquid supply pipe; 502. Second booster pump; 503. Water washing pipe; 504. Spray plate; 505. Supporting drainage plate; 506. Liquid collecting tank; 507. Drain pipe; 6. Filter mechanism; 7. Spray head; 8. First liquid storage tank; 9. Second anemometer; 10. First anemometer; 11. Drying chamber; 12. Blowing chamber; 13. Equipment compartment. DETAILED DESCRIPTION

[0079] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0080] Please note that the terms "above", "below", "left", "right", "top", "top", "bottom", "bottom", etc. used in the present invention to describe the positional relationship do not represent the absolute positional relationship between the modules / components / assemblies / components / parts, but the relative positional relationship between the modules / components / assemblies / components / parts.

[0081] Example 1

[0082] A ceramic shell drying device for casting, such as Figure 1 As shown, it includes a drying chamber 11, a blast chamber 12 and an equipment compartment 13 which are isolated from each other. An air inlet is provided on the side wall of the drying chamber 11, and the air is filtered by a filter mechanism 6. A condensation dryer 1 is provided near the air inlet in the drying chamber 11. A heater 2 is provided on the partition 4 between the drying chamber 11 and the blast chamber 12, and the air flow between the drying chamber 11 and the blast chamber 12 is connected through the heater 2. A blower 3 is installed on the side wall of the blast chamber 12 to blow out the gas in the blast chamber 12.

[0083] like Figure 2 As shown, the condensation dryer 1 comprises: a compressor 101, a first tubular heat exchanger 102, an expansion valve 103, and a cold row 104 arranged in a tube-row arrangement. The cold row 104 is arranged along the cross-sectional direction of the main flow direction of the airflow inside the drying chamber 11.

[0084] The outlet end of the compressor 101 is connected to the inlet end of the first tubular heat exchanger 102, the outlet end of the first tubular heat exchanger 102 is connected to the inlet end of the expansion valve 103, the outlet end of the expansion valve 103 is connected to the inlet end of the cold row 104, and the outlet end of the cold row 104 is connected to the inlet end of the compressor 101.

[0085] The operation status of the condensing dryer 1, the heater 2 and the blower 3 is controlled by a control system.

[0086] In the condensation dryer 1 of the prior art, the high-temperature and high-pressure refrigerant liquid generated by the compressor 101 is generally cooled by air through a heat dissipation pipe in combination with a blower, so that the refrigerant entering the cold row 104 becomes a high-pressure and low-temperature refrigerant liquid, and after passing through the expansion valve, the high-pressure and low-temperature refrigerant liquid is converted into a low-pressure and low-temperature refrigerant gas. In the process of the refrigerant changing from the liquid phase to the gas phase, a large amount of ambient heat will be absorbed, so that the cold row 104 is in a low-temperature state as a whole. At this time, the moisture in the airflow passing through the cold row 104 will condense into water droplets on the pipe wall of the cold row 104 when it is cold, thereby significantly reducing the moisture content in the airflow passing through the cold row 104, and realizing the low-temperature drying treatment of the airflow.

[0087] However, the existing technology uses a heat dissipation pipe in conjunction with a blower to cool the air. On the one hand, a large amount of heat energy is directly dissipated to the environment around the heat dissipation pipe, which requires the heat dissipation pipe to be installed outside the dry area, resulting in an increase in the refrigerant pipe length of the equipment, a limited equipment installation location, and a large amount of heat energy is wasted. On the other hand, this method is greatly affected by the temperature of the ambient air. High and low ambient temperatures will significantly affect the temperature of the refrigerant entering the expansion valve 103, resulting in unstable temperature of the cold row 104, thereby affecting the stability of condensation drying and causing interference with the stable control of humidity in the dry area.

[0088] Therefore, the present invention changes the cooling method of the high-temperature and high-pressure refrigerant liquid in the prior art, and adopts the first tubular heat exchanger 102 to cool the high-temperature and high-pressure refrigerant liquid. In this way, on the one hand, the refrigerant pipe can be installed as a whole inside the device, effectively reducing the refrigerant pipe process, and the restrictions on the installation position of the equipment are significantly reduced. On the other hand, the use of a tubular heat exchanger can effectively control the output refrigerant temperature, so that the refrigerant temperature entering the cold row 104 is relatively stable and less affected by the ambient temperature, so that the temperature of the cold row 104 tends to be stable, which significantly improves the stability of condensation drying.

[0089] Example 2

[0090] Based on the casting ceramic shell drying device of Example 1, Figure 3 As shown, the heat pipe inlet end of the first tubular heat exchanger 102 is connected to the outlet end of the compressor 101 through the first connecting pipe 1023, and the heat pipe outlet end is connected to the inlet end of the expansion valve 103 through the second connecting pipe 1024. The coolant inlet end of the first tubular heat exchanger 102 is connected to the external liquid supply device through the third connecting pipe 1022, and the coolant outlet end is connected to the external liquid storage device through the fourth connecting pipe 1021. The third connecting pipe 1022 is provided with a first booster pump 1025.

[0091] This arrangement can pump the low-temperature heat exchange medium in the external liquid supply device into the first tubular heat exchanger 102 through the first booster pump 1025 to cool the high-temperature and high-pressure refrigerant liquid, and the high-temperature heat exchange medium after heat exchange enters the external liquid storage device from the fourth connecting pipe 1021. The third connecting pipe 1022 and the fourth connecting pipe 1021 can be hoses or pipes connected by hoses as needed. The heat exchange medium can be a mixture of one or more existing heat exchange media such as water, hot oil, ethylene glycol, alcohol, etc. as needed.

[0092] This arrangement can introduce the high-temperature heat exchange medium in the external liquid storage device into other heat-demanding mechanisms as needed to recover and reuse heat energy, thereby achieving effective utilization of heat energy and achieving energy-saving effects.

[0093] Example 3

[0094] Based on the casting ceramic shell drying device of Example 2, Figure 3 As shown, the external liquid supply device and the external liquid storage device are the first liquid storage tank 8, the third connecting pipe 1022 is connected to the bottom of the first liquid storage tank 8, and the fourth connecting pipe 1021 is connected to the top of the first liquid storage tank 8. The first liquid storage tank 8 is installed inside the equipment cabin 13 or outside the ceramic shell drying device for casting.

[0095] This arrangement unifies the external liquid supply device and the external liquid storage device into the first liquid storage tank 8, so that the heat exchange medium that has completed the heat exchange is naturally cooled in the first liquid storage tank 8 and then enters the first tubular heat exchanger 102 for heat exchange. This arrangement can effectively shorten the tube path, making the structure of the entire device more compact, and can also realize the recycling of the heat exchange medium.

[0096] Example 4

[0097] Based on the casting ceramic shell drying device of Example 2, Figure 3 As shown, a first three-way valve 1026 is provided between the first boosting pump 1025 and the first tubular heat exchanger 102. The inlet end of the first three-way valve 1026 is connected to the outlet end of the first boosting pump 1025, one outlet end is connected to the fourth connecting pipe 1021, and the other outlet end is connected to the coolant inlet end of the first tubular heat exchanger 102.

[0098] In order to keep the refrigerant output by the first tubular heat exchanger 102 always within the target temperature range, the flow rate of the heat exchange medium entering the first tubular heat exchanger 102 needs to be changed according to the change of the ambient temperature. For example, in winter, the external ambient temperature is low, and the refrigerant naturally cools faster during the flow in the pipeline. Therefore, it is necessary to reduce the flow rate of the heat exchange medium in the first tubular heat exchanger 102 to avoid the problem of pipeline icing caused by the refrigerant temperature being too low, which leads to the temperature of the radiator 104 being too low. The icing of the pipeline of the radiator 104 will cause a series of problems, the most common of which are:

[0099] 4. Obstruct airflow, causing the blower to run at a higher power to ensure the air volume.

[0100] 5. The refrigerant in the radiator cannot absorb enough heat, resulting in a decrease in the cooling effect, affecting the cooling and dehumidification effects, or causing the compressor operating power to increase.

[0101] 6. If the ice layer is not cleaned in time, it will gradually accumulate. On the one hand, it will cause additional stress to the radiator pipeline due to the expansion of the ice layer. On the other hand, the accumulated ice layer will cause the pipeline itself to bear more pressure (the weight of the ice layer), thus affecting the service life of the pipeline.

[0102] In summer, the external ambient temperature is relatively high. At this time, the refrigerant cools naturally slowly during its flow in the pipeline. Therefore, it is necessary to increase the flow rate of the heat exchange medium in the first tubular heat exchanger 102 to avoid the problem that the refrigerant temperature is too high, resulting in the temperature of the cold discharge 104 being too high and causing poor condensation and drying effect.

[0103] The prior art commonly changes the flow rate of the heat exchange medium in the first tubular heat exchanger 102 by changing the operating power of the first booster pump 1025. However, on the one hand, the frequent change of the operating power of the first booster pump 1025 is likely to cause the first booster pump 1025 to fail, resulting in an increase in the use and maintenance costs. On the other hand, the change in the operating power of the first booster pump 1025 causes a certain hysteresis in the change in the flow rate, and the control accuracy is poor. The present invention realizes real-time and accurate control of the flow rate of the heat exchange medium entering the first tubular heat exchanger 102 by introducing the first three-way valve 1026 into the flow loop of the heat exchange medium. This method can not only adjust the flow rate of the heat exchange medium entering the first tubular heat exchanger 102 in real time by adjusting the flow ratio of the flow to the first tubular heat exchanger 102 and the flow to the fourth connecting pipe 1021, but also does not need to change the operating power of the first booster pump 1025, thereby avoiding the problem caused by the frequent change in the operating power of the first booster pump 1025.

[0104] Example 5

[0105] Based on the ceramic shell drying device for casting of Example 4, the first three-way valve 1026 is an electrically controlled three-way valve, and the control signal receiving end of the first three-way valve 1026 is connected to the control system signal. An ambient temperature sensor is provided outside the ceramic shell drying device for casting, and the ambient temperature sensor sends the ambient temperature outside the ceramic shell drying device for casting to the control system in real time. The control system controls the flow ratio between the two passages of the first three-way valve 1026 according to the temperature information sent by the received ambient temperature sensor.

[0106] The method detects the ambient temperature in real time through an ambient temperature sensor, and controls the first three-way valve 1026 to adjust the flow ratio between the two passages according to the basic rules in Example 4 after performing threshold comparison analysis through the control system, thereby achieving real-time automatic and precise control of the flow of the heat exchange medium entering the first tubular heat exchanger 102.

[0107] Example 6

[0108] Based on the ceramic shell drying device for casting in Example 5, a first electronic thermometer is provided at the inlet end of the expansion valve 103, and the control system receives temperature information Y of the first electronic thermometer in real time and makes the following judgment:

[0109] When Y∈U, the current flow ratio between the two passages of the first three-way valve 1026 is maintained.

[0110] when And if Y is greater than Tmax, the first three-way valve 1026 is controlled to increase the flow to the first tubular heat exchanger 102 .

[0111] when And if Y is less than Tmin, the first three-way valve 1026 is controlled to reduce the flow to the first tubular heat exchanger 102 .

[0112] U is a preset temperature range, Tmax is the maximum value of U, and Tmin is the minimum value of U.

[0113] This embodiment provides a threshold comparison analysis method, wherein: the preset temperature range U is a temperature range preset according to the surface area of ​​the radiator 104, generally between ±1°C and ±2°C of the preset target temperature, and the preset target temperature can be selected according to the specific surface area of ​​the radiator 104 and the external ambient temperature, with the purpose of ensuring that the refrigerant temperature exiting the radiator 104 is not lower than the preset minimum temperature, for example: 1°C or 0°C.

[0114] Taking the radiator 104 with a diameter of 2 cm and a total length of 10 meters as an example, the target temperature can be preset to 23°C in summer, and U can be 22°C-24°C at this time. The target temperature can be preset to 25°C in winter, and U can be 24°C-26°C at this time.

[0115] Example 6

[0116] Based on the above-mentioned embodiment of the ceramic shell drying device for casting, Figure 4 As shown, a second tubular heat exchanger 105 is provided between the first tubular heat exchanger 102 and the expansion valve 103 .

[0117] The second tubular heat exchanger 105 includes a heat dissipation pipe 1051 , the inlet end of the heat dissipation pipe 1051 is connected to the outlet end of the first tubular heat exchanger 102 through a fifth connecting pipe 1052 , and the outlet end of the heat dissipation pipe 1051 is connected to the inlet end of the expansion valve 103 through a sixth connecting pipe 1053 .

[0118] The prior art mainly uses a heat pipe to naturally cool or blast cool the high-pressure and high-temperature refrigerant output by the compressor 101 into a high-pressure and low-temperature refrigerant, so that the refrigerant absorbs as much external heat as possible when it is converted into a low-pressure and low-temperature refrigerant in the cold row 104. The present invention cools the high-pressure and high-temperature refrigerant for the first time through the first tubular heat exchanger 102 of the above embodiment. However, it is found during use that when only the first tubular heat exchanger 102 is used, sometimes the refrigerant temperature output by the first tubular heat exchanger 102 meets the temperature control requirements, but the refrigerant needs to pass through a pipe from the first tubular heat exchanger 102 to the expansion valve 103. Therefore, the temperature of the refrigerant entering the expansion valve 103 fluctuates to a certain extent under the influence of the external ambient temperature, and it is very likely that the temperature control requirements will no longer be met. On the other hand, with the continuous use time of the ceramic shell drying device and the influence of the external high-temperature environment, the refrigerant temperature output by the first tubular heat exchanger 102 will exceed the upper limit of the temperature control by a large amount, resulting in an excessively high temperature of the cold row 104, and the dehumidification effect is significantly weakened.

[0119] Therefore, the present invention sets a second tubular heat exchanger 105 at a position close to the expansion valve 103, and performs relatively accurate temperature control through the second tubular heat exchanger 105, so that the temperature of the refrigerant entering the expansion valve 103 meets the temperature control requirement.

[0120] Example 7

[0121] Based on the casting ceramic shell drying device of Example 6, Figure 5 and Figure 6 As shown, the second tube heat exchanger 105 further includes: a heat exchange exhaust pipe 1054 , and the heat exchange exhaust pipe 1054 is arranged close to the heat dissipation exhaust pipe 1051 .

[0122] A second three-way valve 106 is provided between the compressor 101 and the first tubular heat exchanger 102, wherein the inlet end of the second three-way valve 106 is connected to the outlet end of the compressor 101, one outlet end is connected to the inlet end of the first tubular heat exchanger 102, and the other outlet end is connected to the inlet end of the heat exchange exhaust pipe 1054 through the seventh connecting pipe 1056. The outlet end of the heat exchange exhaust pipe 1054 is connected to the inlet end of the first tubular heat exchanger 102 through the eighth connecting pipe 1055.

[0123] The second three-way valve 106 is an electrically controlled three-way valve, and the control signal receiving end of the second three-way valve 106 is connected to the control system signal. An ambient temperature sensor is provided outside the ceramic shell drying device for casting, and the ambient temperature sensor sends the ambient temperature outside the ceramic shell drying device for casting to the control system in real time. The control system controls the flow ratio between the two passages of the second three-way valve 106 according to the temperature information sent by the received ambient temperature sensor.

[0124] When the external ambient temperature is low, especially in the northern region, the external ambient temperature is likely to be below zero. At this time, the second tubular heat exchanger 105 is likely to need to heat the refrigerant to prevent the refrigerant with too low a temperature from entering the radiator 104 .

[0125] Traditional heating methods are generally resistance wire heating, hot air heating or steam pipe heat exchange, but all of them have the problem of high energy consumption. To this end, the present invention provides a relatively energy-saving method for heating the refrigerant, that is, through the second three-way valve 106, part of the high-temperature and high-pressure refrigerant is diverted to the heat exchange exhaust pipe 1054, and the heat dissipation action of the high-temperature and high-pressure refrigerant at the heat exchange exhaust pipe 1054 is utilized. On the one hand, the high-temperature and high-pressure refrigerant is cooled by the heat dissipation action, and on the other hand, the refrigerant flowing through the heat dissipation exhaust pipe 1051 can be heated, thereby achieving the heating and temperature-raising effect of the refrigerant with more than 90% lower energy consumption than resistance wire heating, hot air heating or steam pipe heat exchange.

[0126] Example 8

[0127] Based on the casting ceramic shell drying device of Example 1, Figure 1 , Figure 7-9 As shown, the partition 4 is provided with a cleaning system 5 at the position of the cold row 104 , and the cleaning system 5 includes: a spray plate 504 provided on the top of the cold row 104 and covering the cold row 104 , and a supporting drainage plate 505 provided at the bottom of the cold row 104 .

[0128] The spray plate 504 is provided with a plurality of spray holes 506 on one side facing the radiator 104, and all the spray holes 506 are connected to the water washing pipe 503. The water washing pipe 503 is connected to the liquid supply pipe 501 through the second booster pump 502, and the liquid supply pipe 501 is connected to the cleaning water storage mechanism.

[0129] The supporting drainage plate 505 is provided with a liquid collecting groove 506 at the position of the cold row 104, and the bottom of the cold row 104 is fixed on the supporting drainage plate 505 on both sides of the liquid collecting groove 506. The bottom of the liquid collecting groove 506 is connected to the external water treatment mechanism through the drainage pipe 507.

[0130] The control signal input end of the second boosting pump 502 is connected to the control system signal, and the control system controls the start-up of the second boosting pump 502 according to the analysis result of the washing and cooling radiator analysis.

[0131] During the use of the radiator 104, dust or debris may sometimes accumulate, which significantly increases the difficulty of airflow passing through the radiator 104, thereby affecting the effect of delivering dry airflow to the target area. The conventional method for dealing with this is to regularly shut down the radiator 104 to clean and maintain the debris. Regular shutdown and maintenance will cause the ceramic shell drying work to be terminated, affecting production efficiency. On the other hand, since the accumulation of dust or debris is an uncertain process, it is very likely that the scheduled time is not reached when cleaning is required and the cleaning is not timely. It is also possible that there is not actually too much dust or debris accumulated during cleaning, resulting in unnecessary waste of production time.

[0132] In addition, during use, the radiator 104 is likely to be affected by the external temperature or its own refrigerant absorption, resulting in the wall temperature being too low, thereby causing the wall to freeze. The harm of radiator pipeline freezing is significant. According to the analysis results of the radiator washing analysis, the present invention can also forcibly wash the radiator 104 through forced washing when necessary to flush away the water droplets condensed from the airflow or the thin ice layer that has been formed on the wall of the radiator 104, so as to avoid radiator freezing or ice accumulation.

[0133] Example 9

[0134] Based on the casting ceramic shell drying device of Example 8, Figure 1 and Fig.10 As shown, a first anemometer 10 and a second anemometer 9 are respectively provided on both sides of the cold row 104 along the airflow direction in the drying chamber 11 .

[0135] The cold row washing analysis includes: flow rate difference analysis, and the flow rate difference analysis includes:

[0136] Step 1.1 receives the first wind speed S1 of the first anemometer 10 and the second wind speed S2 of the second anemometer 9 in real time.

[0137] Step 1.2 Calculate the wind speed difference C = S1 - S2.

[0138] Step 1.3: When C≥K1, it is determined that the cold row needs to be washed, and the second booster pump 502 is controlled to start. K1 is a preset flow rate difference threshold.

[0139] This method is the first of the radiator washing analysis methods exemplified in the present invention, that is, the smoothness of the airflow passing through the radiator 104 is determined by collecting the airflow velocity difference on both sides of the radiator 104. When C ≥ K1, it is considered that too much dust, impurities, and ice layers are attached to the radiator 104, so it is necessary to perform a forced radiator washing action to clean the dust, impurities, and ice layers attached to the surface of the radiator. K1 is a preset flow rate difference threshold, which is generally set according to factors such as the size of the radiator, the density of the radiator pipeline, and the use requirements of the casting ceramic shell drying device.

[0140] Example 10

[0141] Based on the ceramic shell drying device for casting of Example 8, a second electronic thermometer is provided at the outlet of the cold row 104 to detect the temperature of the refrigerant at the end of the cold row 104 and send the detection result to the control system.

[0142] The cold row washing analysis includes: cold row temperature analysis, and the cold row temperature analysis includes:

[0143] Step 2.1: Receive temperature information T from the second electronic thermometer in real time.

[0144] Step 2.2: When T≤K2, it is determined that the radiator needs to be washed, and the second booster pump 502 is started. K2 is a preset temperature threshold.

[0145] This method is the second one of the radiator washing analysis methods exemplified in the present invention. This method mainly monitors the temperature of the refrigerant at the end of the radiator 104. That is, when the temperature of the refrigerant at the end of the radiator 104 is low, the present invention believes that the temperature in the radiator 104 pipeline is low, and the radiator 104 has a potential possibility of pipeline freezing. In order to avoid possible freezing of the radiator 104 pipeline, the forced radiator washing is started to flush the pipeline surface. The water flow flushes the pipeline surface to remove water droplets, thereby reducing the possibility of freezing on the pipeline surface.

[0146] K2 is the preset temperature threshold, which can generally be set to 0-5℃, and can be adjusted according to the local ambient temperature. For example, when the ambient temperature is high (for example, 20℃), K2 can be set lower, such as 0℃ or 1℃. When the ambient temperature is low (for example, -5℃), K2 can be set higher, such as 3℃ or 4℃.

[0147] Embodiment 11

[0148] Based on the ceramic shell drying device for casting of Example 8, an electronic barometer is provided at the inlet end of the compressor 101 for detecting the refrigerant pressure at the inlet end of the compressor 101 and sending the detection result to the control system.

[0149] The radiator washing analysis includes: refrigerant pressure analysis, and the refrigerant pressure analysis includes:

[0150] Step 3.1 Receive the pressure information P from the electronic barometer in real time.

[0151] Step 3.2: When P≤K3, it is determined that the radiator needs to be washed, and the second booster pump 502 is started. K3 is a preset pressure threshold.

[0152] This method is the third of the radiator washing analysis methods exemplified in the present invention. This method mainly monitors the refrigerant pressure at the inlet end of the compressor 101. That is, when the refrigerant pressure at the inlet end of the compressor 101 is low, the present invention believes that the refrigerant has insufficient heat absorption at the radiator 104, that is, the radiator 104 may have pipeline icing problems or too much dust and debris attached to the pipeline surface. By starting forced radiator washing to flush the pipeline surface, the ice layer, dust and debris attached to the pipeline surface can be cleaned off.

[0153] K3 is a preset low-pressure threshold value at the inlet end of the compressor 101 , and is generally set with reference to the return air pressure of the compressor 101 when ice forms on the cold row 104 .

[0154] Example 12

[0155] Based on the ceramic shell drying device for casting in Example 8, the cold row washing analysis includes: timing analysis, and the timing analysis includes:

[0156] Step 4.1 Obtain current time information N in real time.

[0157] Step 4.2: When N∈M, it is determined that the cold row needs to be washed, and the second booster pump 502 is controlled to start. The M is a set of preset time points.

[0158] This method is the fourth of the wash and cold row analysis methods exemplified in the present invention, and adopts the currently more common timing control method.

[0159] The present invention exemplarily provides four radiator cleaning analysis methods, each of which can be used alone or in combination. The methods provided in Examples 9-11 can realize automatic cleaning control of the radiator, that is, when the pipeline of the radiator 104 is likely to be frozen or has been frozen or a lot of dust or debris has accumulated, the radiator is automatically cleaned, which effectively avoids the problems existing in the prior art of timed radiator cleaning.

[0160] Example 13

[0161] Based on the above-mentioned embodiment of the ceramic shell drying device for casting, Figure 1As shown, a plurality of jet heads 7 are arranged along one side of the cold row 104. The jet direction of the jet heads 7 is tilted downward toward the cold row 104. All the jet heads 7 are respectively connected to the output end of the air compressor.

[0162] At this time, the control system controls the second boosting pump 502 to be turned off after the first preset time is started, and the air compressor is turned off after the preset second time is started.

[0163] The main purpose of the nozzle 7 added in the present invention is to output high-pressure airflow through the nozzle 7 to blow off the water droplets remaining on the surface of the radiator 104 pipeline after the radiator washing operation, thereby avoiding the possibility of icing on the pipeline surface due to excessive humidity on the pipeline surface caused by radiator washing.

[0164] Embodiment 14

[0165] A ceramic shell drying system for casting, such as Fig.11 As shown, it includes: at least one ceramic shell drying device for casting according to the above embodiment is installed in the drying area, at least one humidifier, several temperature sensors and humidity sensors located at different positions, and a drying control system connected to the ceramic shell drying device for casting, the humidifier, the temperature sensor and the humidity sensor signal.

[0166] The drying control system receives temperature information from the temperature sensor and humidity information from the humidity sensor, and controls the humidifier and the ceramic shell drying device according to preset conditions to control the temperature and humidity in the drying area.

[0167] The present invention provides a ceramic shell drying system for casting constructed by using the ceramic shell drying device of the above embodiment. In this case, the ceramic shell drying device mainly plays the role of providing a dry airflow with a suitable temperature.

[0168] According to one embodiment of the present invention, the drying area is a drying room or a drying cavity of a drying device. That is, the drying area can be an area in a drying room used for large-scale drying where the ceramic shell to be dried is placed, or it can be a chamber in a ceramic shell dryer for placing the ceramic shell to be dried.

[0169] Compared with the traditional large-scale drying which requires the drying area to be in a low humidity environment, the present invention installs a humidifier in the drying area to adjust the humidity in the drying area in conjunction with the ceramic shell drying method of the present invention, and performs humidification treatment when necessary.

[0170] Embodiment 15

[0171] A ceramic shell drying method, using the ceramic shell drying system for casting shown in Example 14 to dry the ceramic shell to be dried.

[0172] When drying the ceramic shell, perform the following steps:

[0173] When the surface layer of the ceramic shell to be dried is dried, the humidity in the drying area is controlled to be 70-90% and the temperature is 20-24°C.

[0174] When the second layer of the ceramic shell to be dried is dried, the humidity in the drying area is controlled to be 50-70% and the temperature is 22-26°C.

[0175] When the third layer of the ceramic shell to be dried is dried, the humidity in the drying area is controlled to be 40-50% and the temperature is controlled to be 22-26°C.

[0176] When drying the fourth and subsequent ceramic shell layers of the ceramic shell to be dried, the humidity in the drying area is controlled to be 30-40% and the temperature is controlled to be 22-26°C.

[0177] When drying the surface layer or the surface layer and the second layer of the ceramic shell to be dried, the air flow velocity in the drying area is controlled so that the difference between the dry-bulb temperature and the wet-bulb temperature does not exceed 2°C.

[0178] When drying ceramic shells in the prior art, it is generally required that the drying area be as high in temperature as possible (since the ceramic shell to be dried is the slurry applied on the wax film, the drying temperature cannot exceed the melting temperature of the wax film) and as low in humidity as possible, in the hope of completing the drying as efficiently as possible. However, the prior art has long had the problem of low ceramic shell drying yield, which is mainly manifested in the surface ceramic shell (i.e., the ceramic shell in contact with the wax film) and the supporting layer ceramic shell close to the surface layer being prone to cracking, also known as surface layer cracking. The ceramic shell with a cracked surface layer is waste, and since the ceramic shell cannot be rehydrated and reused after drying, it causes a serious waste of time and materials.

[0179] The existing technology lacks effective technical means to solve this problem. Common methods to overcome the cracking of the surface layer include: adding various reagents to the ceramic shell slurry, conducting pilot or small-scale tests on each batch of ceramic shells to adjust the drying temperature and drying time parameters to obtain the highest yield rate, and using vacuum rapid drying to dry the ceramic shells. However, the existing technology still has:

[0180] 1. Adding various reagents to the ceramic shell slurry will obviously increase the material cost, and it still cannot effectively solve the problem of surface cracking.

[0181] 2. Although adjusting the drying temperature and drying time parameters through pilot or small-scale tests can relatively improve the yield rate, on the one hand, it obviously slows down the drying efficiency. On the other hand, the yield rate of large-scale drying is difficult to reach the yield rate of pilot or small-scale tests, and there is obvious instability.

[0182] 3. Vacuum rapid drying needs to be carried out in specific equipment. Although the ceramic shell drying efficiency is high and the drying yield is high, it is limited by the size of the equipment drying chamber, and there are costs for purchasing and using the equipment. There are certain cost increases or cost inconveniences when drying large-scale, large-size, and low-value-added ceramic shells.

[0183] After research, the applicant found that the reasons for the cracking of the surface layer are mainly due to the following technical reasons, in addition to defects in the process of applying the slurry and the ceramic shell slurry not meeting the quality requirements:

[0184] 1. For ceramic shells with complex structures or large thickness, drying in a high temperature and low humidity environment may result in the outer surface layer drying completely while the inner surface layer is not yet dried. At this time, if you wait until both the inner and outer surfaces of the ceramic shell are dried completely, the outer surface layer will be over-dried, and over-drying can easily cause cracks. The cracks on the outer surface layer can easily develop inward and outward after being stressed, thus forming long cracks on the ceramic shell, causing the ceramic shell to become waste.

[0185] 2. The drying process of the ceramic shell is a process in which the water in the ceramic shell slurry evaporates, and the volatilization of water is an endothermic process, which will cause the temperature of the wax film inside the ceramic shell to be dried to drop. Wax is a material that is easily affected by temperature and expands and contracts. Therefore, during the drying process of the ceramic shell surface layer, the wax film gradually shrinks, and the drying of the ceramic shell slurry generally follows the rule from the outside to the inside. Therefore, the inside of the surface ceramic shell will shrink as the wax film shrinks due to the cold during the drying process. When the water in the ceramic shell gradually evaporates, the wax film gradually returns to the outside temperature. At this time, the wax film will expand due to the heat and exert an extrusion force on the already shrunk inner layer of the ceramic shell. At this time, the inside of the ceramic shell is often not completely dry to form a solid ceramic shell layer, so it is easily deformed and cracked by the extrusion of the wax film, resulting in the surface layer drying and becoming waste.

[0186] Based on the applicant's research, the applicant changed the technical habits of traditional ceramic shell drying. When drying the surface layer, a high-humidity and relatively low-temperature drying environment was adopted, so that the surface ceramic shell was gradually dried in a very slow manner. In this way, the moisture in the ceramic shell would not evaporate quickly during the drying process. This can not only make the drying progress inside and outside the ceramic shell tend to be consistent, but also avoid the problem of cooling the wax film caused by the rapid volatilization of moisture in the ceramic shell, and effectively reduce the shrinkage and expansion of the wax film during the drying process of the ceramic shell, thereby significantly reducing the problem of cracking of the ceramic shell surface.

[0187] The present invention gradually reduces the humidity of the drying environment and increases the temperature of the drying environment when drying the subsequent ceramic shell layer, so that the drying efficiency can be gradually improved when the ceramic shell has a certain strength basis. Therefore, on the basis of ensuring good overall drying efficiency, the drying yield rate of the ceramic shell in batch drying is significantly improved. On the basis that the ceramic shell slurry meets the regulations and the sizing operation meets the regulations, the drying yield rate of the ceramic shell can generally reach more than 95%.

[0188] Compared with the traditional ceramic shell drying device for casting, the ceramic shell drying device for casting of the present invention can make the airflow input into the drying chamber have better flow stability and temperature stability through good temperature control of the refrigerant and effective anti-icing control of the radiator. The humidity will fluctuate to a certain extent when washing the radiator. However, since the ceramic shell drying method of the present invention changes the traditional low humidity control requirement, it will not cause obvious effects on the drying of the ceramic shell. When drying the surface layer, it can reduce the need for the operation of the humidifier.

[0189] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A ceramic shell drying device for casting, characterized in that: The invention comprises a drying chamber (11), a blast chamber (12) and an equipment compartment (13) which are isolated from each other; an air inlet is provided on the side wall of the drying chamber (11), and the air inlet is filtered by a filtering mechanism (6); a condensing dryer (1) is provided in the drying chamber (11) near the air inlet; a heater (2) is provided on the partition (4) between the drying chamber (11) and the blast chamber (12), and the air flow between the drying chamber (11) and the blast chamber (12) is connected through the heater (2); a blower (3) for blowing out the gas in the blast chamber (12) is installed on the side wall of the blast chamber (12); The condensing dryer (1) comprises: a compressor (101), a first tubular heat exchanger (102), an expansion valve (103), and a cold row (104) arranged in a tube-row manner; the cold row (104) is arranged along the cross-sectional direction of the main flow direction of the airflow inside the drying chamber (11); The outlet end of the compressor (101) is connected to the inlet end of the first tubular heat exchanger (102), the outlet end of the first tubular heat exchanger (102) is connected to the inlet end of the expansion valve (103), the outlet end of the expansion valve (103) is connected to the inlet end of the cold row (104), and the outlet end of the cold row (104) is connected to the inlet end of the compressor (101). The operating states of the condensing dryer (1), the heater (2) and the blower (3) are controlled by a control system.

2. The ceramic shell drying device for casting according to claim 1, characterized in that: The filtering mechanism (6) is a felt filter or a metal filter with a mesh size of 250-400.

3. The ceramic shell drying device for casting according to claim 1, characterized in that: The heat pipe inlet end of the first tubular heat exchanger (102) is connected to the outlet end of the compressor (101) through a first connecting pipe (1023), and the heat pipe outlet end is connected to the inlet end of the expansion valve (103) through a second connecting pipe (1024); the cooling liquid inlet end of the first tubular heat exchanger (102) is connected to an external liquid supply device through a third connecting pipe (1022), and the cooling liquid outlet end is connected to an external liquid storage device through a fourth connecting pipe (1021); a first booster pump (1025) is provided on the third connecting pipe (1022).

4. The ceramic shell drying device for casting according to claim 3, characterized in that: The external liquid supply device and the external liquid storage device are a first liquid storage tank (8), the third connecting pipe (1022) is connected to the bottom of the first liquid storage tank (8), and the fourth connecting pipe (1021) is connected to the top of the first liquid storage tank (8); the first liquid storage tank (8) is installed: inside the equipment cabin (13) or outside the ceramic shell drying device for casting.

5. The ceramic shell drying device for casting according to claim 3, characterized in that: A first three-way valve (1026) is provided between the first boosting pump (1025) and the first tubular heat exchanger (102); an inlet end of the first three-way valve (1026) is connected to an outlet end of the first boosting pump (1025), one outlet end is connected to a fourth connecting pipe (1021), and the other outlet end is connected to a coolant inlet end of the first tubular heat exchanger (102).

6. The ceramic shell drying device for casting according to claim 5, characterized in that: The first three-way valve (1026) is an electrically controlled three-way valve, and a control signal receiving end of the first three-way valve (1026) is connected to a control system signal; an ambient temperature sensor is provided outside the ceramic shell drying device for casting, and the ambient temperature sensor sends the external ambient temperature of the ceramic shell drying device for casting to the control system in real time, and the control system controls the flow ratio between the two passages of the first three-way valve (1026) according to the temperature information sent by the ambient temperature sensor.

7. The ceramic shell drying device for casting according to claim 6, characterized in that: A first electronic thermometer is provided at the inlet end of the expansion valve (103), and the control system receives temperature information Y from the first electronic thermometer in real time and makes the following judgment: When Y∈U, the flow ratio between the two passages of the current first three-way valve (1026) is maintained; when and Y is greater than Tmax, the first three-way valve (1026) is controlled so that the flow rate to the first tubular heat exchanger (102) increases; when and Y is less than Tmin, the first three-way valve (1026) is controlled so that the flow rate to the first tubular heat exchanger (102) is reduced; U is a preset temperature range, Tmax is the maximum value of U, and Tmin is the minimum value of U.

8. The ceramic shell drying device for casting according to claim 1, characterized in that: A second tubular heat exchanger (105) is provided between the first tubular heat exchanger (102) and the expansion valve (103); The second tubular heat exchanger (105) comprises a heat dissipation pipe (1051), the inlet end of the heat dissipation pipe (1051) is connected to the outlet end of the first tubular heat exchanger (102) via a fifth connecting pipe (1052), and the outlet end of the heat dissipation pipe (1051) is connected to the inlet end of the expansion valve (103) via a sixth connecting pipe (1053).

9. The ceramic shell drying device for casting according to claim 8, characterized in that: The second tubular heat exchanger (105) further comprises: a heat exchange exhaust pipe (1054), wherein the heat exchange exhaust pipe (1054) is arranged close to the heat dissipation exhaust pipe (1051); A second three-way valve (106) is provided between the compressor (101) and the first tubular heat exchanger (102); an inlet end of the second three-way valve (106) is connected to an outlet end of the compressor (101), one outlet end is connected to an inlet end of the first tubular heat exchanger (102), and the other outlet end is connected to an inlet end of a heat exchange exhaust pipe (1054) via a seventh connecting pipe (1056); and the outlet end of the heat exchange exhaust pipe (1054) is connected to an inlet end of the first tubular heat exchanger (102) via an eighth connecting pipe (1055).

10. The ceramic shell drying device for casting according to claim 9, characterized in that: The second three-way valve (106) is an electrically controlled three-way valve, and a control signal receiving end of the second three-way valve (106) is connected to a control system signal; an ambient temperature sensor is provided outside the ceramic shell drying device for casting, and the ambient temperature sensor sends the ambient temperature outside the ceramic shell drying device for casting to the control system in real time, and the control system controls the flow ratio between the two passages of the second three-way valve (106) according to the temperature information sent by the ambient temperature sensor.

11. The ceramic shell drying device for casting according to claim 1, characterized in that: The partition (4) is provided with a cleaning system (5) at the position of the cold row (104), and the cleaning system (5) comprises: a spray plate (504) arranged on the top of the cold row (104) and covering the cold row (104), and a supporting drainage plate (505) arranged at the bottom of the cold row (104); A plurality of spray holes (506) are provided on the side of the spray plate (504) facing the radiator (104), and all of the spray holes (506) are connected to the water washing pipe (503); the water washing pipe (503) is connected to the liquid supply pipe (501) through the second booster pump (502), and the liquid supply pipe (501) is connected to the cleaning water storage mechanism; The supporting drainage plate (505) is provided with a liquid collecting groove (506) at the position of the cold row (104); the bottom of the cold row (104) is straddled on the supporting drainage plate (505) fixed on both sides of the liquid collecting groove (506); the bottom of the liquid collecting groove (506) is connected to an external water treatment mechanism through a drainage pipe (507); The control signal input end of the second booster pump (502) is connected to the control system signal, and the control system controls the start-up of the second booster pump (502) according to the analysis result of the washing and cooling radiator analysis.

12. The ceramic shell drying device for casting according to claim 11, characterized in that: A first anemometer (10) and a second anemometer (9) are respectively provided on both sides of the cold row (104) along the airflow direction in the drying chamber (11); The cold row washing analysis includes: flow rate difference analysis, and the flow rate difference analysis includes: Step 1.1 receives in real time a first wind speed S1 of a first anemometer (10) and a second wind speed S2 of a second anemometer (9); Step 1.2 Calculate the wind speed difference C = S1-S2; Step 1.3: When C≥K1, it is determined that the radiator needs to be washed, and the second booster pump (502) is started; K1 is a preset flow rate difference threshold.

13. The ceramic shell drying device for casting according to claim 11, characterized in that: A second electronic thermometer is provided at the outlet of the radiator (104) for detecting the temperature of the refrigerant at the end of the radiator (104) and sending the detection result to the control system; The cold row washing analysis includes: cold row temperature analysis, and the cold row temperature analysis includes: Step 2.1 receiving temperature information T of a second electronic thermometer in real time; Step 2.2: When T≤K2, it is determined that the radiator needs to be washed, and the second booster pump (502) is started; K2 is a preset temperature threshold.

14. The ceramic shell drying device for casting according to claim 11, characterized in that: The inlet end of the compressor (101) is provided with an electronic barometer for detecting the refrigerant pressure at the inlet end of the compressor (101) and sending the detection result to the control system; The radiator washing analysis includes: refrigerant pressure analysis, and the refrigerant pressure analysis includes: Step 3.1 Receive pressure information P of the electronic barometer in real time; Step 3.2: When P≤K3, it is determined that the radiator needs to be washed, and the second booster pump (502) is controlled to start; K3 is a preset pressure threshold.

15. The ceramic shell drying device for casting according to claim 11, characterized in that: The washing and cooling row analysis includes: timing analysis, and the timing analysis includes: Step 4.1 obtain current time information N in real time; Step 4.2: When N∈M, it is determined that the cold row needs to be washed, and the second booster pump (502) is controlled to start; M is a set of preset time points.

16. The ceramic shell drying device for casting according to any one of claims 12 to 15, characterized in that: A plurality of nozzles (7) are arranged along one side of the cold row (104); the nozzles (7) spray in an inclined direction downward toward the cold row (104); and all the nozzles (7) are respectively connected to the output end of the air compressor; At this time, the control system controls the second boosting pump (502) to be started for a first preset time and then turned off, and the air compressor to be started for a preset second time and then turned off.

17. A ceramic shell drying system for casting, characterized in that: At least one ceramic shell drying device for casting according to any one of claims 1 to 16, at least one humidifier, several temperature sensors and humidity sensors located at different positions, and a drying control system connected to the ceramic shell drying device for casting, the humidifier, the temperature sensor and the humidity sensor signals are installed in the drying area; The drying control system receives temperature information from the temperature sensor and humidity information from the humidity sensor, and controls the humidifier and the ceramic shell drying device according to preset conditions to control the temperature and humidity in the drying area.

18. The ceramic shell drying system for casting according to claim 17, characterized in that: The drying area is a drying room or a drying cavity of a drying device.

19. A ceramic shell drying method, characterized in that: The ceramic shell to be dried is dried using the ceramic shell drying system for casting as described in any one of claims 17-18.

20. The ceramic shell drying method according to claim 19, characterized in that: When drying the ceramic shell, perform the following steps: When drying the surface layer of the ceramic shell to be dried, the humidity in the drying area is controlled to be: 70-90%, and the temperature is 20-24°C; When drying the second layer of the ceramic shell to be dried, the humidity in the drying area is controlled to be 50-70% and the temperature is 22-26°C; When drying the third layer of the ceramic shell to be dried, the humidity in the drying area is controlled to be 40-50% and the temperature is 22-26°C; When drying the fourth and subsequent ceramic shell layers of the ceramic shell to be dried, the humidity in the drying area is controlled to be 30-40% and the temperature is 22-26°C.

21. The ceramic shell drying method according to claim 20, characterized in that: When drying the surface layer or the surface layer and the second layer of the ceramic shell to be dried, the air flow velocity in the drying area is controlled so that the difference between the dry-bulb temperature and the wet-bulb temperature does not exceed 2°C.

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