A negative pressure water cooling system and method for the gate of a magnesium alloy mold

Abstract

The present invention provides a negative pressure water cooling system and method for a magnesium alloy mold in-gate, comprising a refrigerant piping system and a water circulation piping system; the refrigerant enters a compressor, becomes a high-temperature, high-pressure gas after passing through the compressor, then passes through a shell and tube condenser to become a normal-temperature, high-pressure gas, then passes through a throttle valve to become a low-temperature, low-pressure gas, and finally passes through a plate evaporator to absorb heat from the water, thereby achieving a cooling effect. The beneficial effects of the present invention are: 1. The negative pressure generator generates a pressure difference between the inlet and outlet through the rotation of a circulating pump, allowing water to be circulated in the system, reducing water consumption and improving heat dissipation efficiency; 2. The pressure switch can sound an alarm and shut down the system when the pressure is above or below a certain level, reducing risks; 3. The negative pressure generator ensures that even if the mold cracks, the cooling water will not come into contact with magnesium and explode, thereby improving production efficiency and enhancing the cooling effect.

Description

Technical Field

[0001] The present invention relates to the field of magnesium alloy casting, and in particular to a negative pressure water cooling system and method for a gate in a magnesium alloy mold. Background Art

[0002] The E28 CCB instrument panel bracket support product is a high-end, novel, highly integrated and highly designed pure electric vehicle magnesium alloy product, precisely because it is used in a pure electric vehicle.

[0003] As we all know, pure electric vehicles have strict requirements on the weight of the entire vehicle. Changes in the weight of the entire vehicle have a significant impact on the mileage. Therefore, more and more pure electric vehicles use other materials to replace steel materials. The purpose is to reduce the weight of the entire vehicle, improve safety performance, improve environmental protection, and increase mileage.

[0004] At present, magnesium alloy automobile instrument panel is an alloy material with very good indicators. It can not only meet the performance requirements of the same steel, but also reduce the weight of the same steel by one third.

[0005] However, during the production process, magnesium metal is more active and will explode when it comes into contact with water. Therefore, the traditional water cooling system used in, for example, aluminum alloy molds cannot be used in magnesium alloy molds.

[0006] From a safety perspective, oil cooling is used in magnesium alloy molds.

[0007] In order to improve production efficiency, enhance cooling effect, and ensure safety during magnesium alloy production, the present invention proposes a negative pressure water cooling system and method for a magnesium alloy mold ingate. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention discloses a negative pressure water cooling system and method for the gate of a magnesium alloy mold. The technical solution of the present invention is implemented as follows:

[0009] A negative pressure water cooling system for a magnesium alloy mold ingate, comprising a refrigerant piping system and a water circulation piping system;

[0010] The refrigerant piping system includes a compressor, shell and tube condenser and plate evaporator;

[0011] The compressor is connected to the shell and tube condenser and the plate evaporator, and the shell and tube condenser is connected to the plate evaporator. A capillary tube and a drying filter are provided between the shell and tube condenser and the plate evaporator. A low pressure switch and a low pressure gauge are provided between the compressor and the plate evaporator, and a high pressure switch and a high pressure gauge are provided between the compressor and the shell and tube condenser.

[0012] The water circulation piping system includes a water tank, a circulation pump, a negative pressure generator, a solenoid valve and a flow meter;

[0013] The negative pressure generator is connected to the external mold and the plate evaporator through a pipeline, and the flow meter is set on the pipeline between the external mold and the negative pressure generator;

[0014] The water tank is connected to the circulation pump and the external mold through a pipeline;

[0015] The solenoid valve is arranged on a pipeline connecting the water tank and the external mold, and an air inlet and an air inlet solenoid valve are also arranged on the pipeline.

[0016] Preferably, the water tank includes a water inlet and an overflow port, and the opening and closing of the water inlet and the overflow port are controlled by a liquid level switch.

[0017] Preferably, a drain outlet is provided between the water tank and the circulation pump, and the opening and closing of the drain outlet is controlled by a ball valve.

[0018] Preferably, a method for negative pressure water cooling of a gate in a magnesium alloy mold comprises the following steps:

[0019] S1, check whether the negative pressure water cooling system is safe;

[0020] S2, start the circulation pump and the system starts running;

[0021] S3, the solenoid valve opens, and the water in the water tank enters the external mold through the pipeline;

[0022] S4, the water passing through the external mold is passed through the pipeline and the negative pressure generator into the refrigerant pipeline system for cooling;

[0023] S5, the cooled water returns to the water tank through the negative pressure generator.

[0024] Preferably, S4 includes the following steps:

[0025] S4.1, water enters the compressor and turns into high-temperature and high-pressure steam;

[0026] S4.2, the water vapor is cooled by passing through a shell and tube condenser;

[0027] S4.3, the water returns to the plate evaporator through the drying filter and capillary tube and then returns to the water tank.

[0028] Preferably, in step S4, when the pressure detected by the low pressure gauge or the high pressure gauge is lower than or higher than a set value, the low pressure switch or the high pressure switch shuts down the system.

[0029] Preferably, it further includes S6, when the system finishes working, the solenoid valve is closed, the air inlet solenoid valve is opened, and the water in the system returns to the water tank.

[0030] The implementation of the technical solution of the present invention can solve the technical problem of poor effect and low efficiency of oil circuit cooling in magnesium alloy molds in the prior art; the implementation of the technical solution of the present invention, by changing the original oil circuit cooling to water circuit cooling and adding a negative pressure system, can ensure that even if the mold cracks, the cooling water will not come into contact with magnesium and explode, thereby achieving the technical effect of improving production efficiency and enhancing cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0033] Figure 1 It is a schematic diagram of the system circuit structure;

[0034] Figure 2 This is the circuit diagram of the GW532A chiller;

[0035] Figure 3 This is a flow meter connection diagram.

[0036] In the above drawings, the figure numbers represent:

[0037] 1. Refrigerant piping system

[0038] 1-1. Compressor

[0039] 1-1-1. High pressure switch

[0040] 1-2. Shell and tube condenser

[0041] 1-2-1 Capillary

[0042] 1-2-2. Dry filter

[0043] 1-3. Plate evaporator

[0044] 1-3-1. Low pressure switch

[0045] 1-3-2, Low pressure gauge

[0046] 2. Water circulation piping system

[0047] 2-1. Water tank

[0048] 2-1-1. Water injection port

[0049] 2-1-2. Overflow outlet

[0050] 2-2. Circulation pump

[0051] 2-2-1. Drainage outlet

[0052] 2-2-2, ball valve

[0053] 2-3. Negative pressure generator

[0054] 2-3-1. External mold

[0055] 2-4. Solenoid valve

[0056] 2-4-1. Air Inlet

[0057] 2-4-2. Air Inlet Solenoid Valve

[0058] 2-5. Flow meter DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention. Example

[0060] In a specific embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, a negative pressure water cooling system for a magnesium alloy mold ingate includes a refrigerant piping system 1 and a water circulation piping system 2;

[0061] The refrigerant piping system 1 includes a compressor 1-1, a shell and tube condenser 1-2 and a plate evaporator 1-3;

[0062] Compressor 1-1 is connected to shell and tube condenser 1-2 and plate evaporator 1-3, shell and tube condenser 1-2 is connected to plate evaporator 1-3, capillary tube 1-2-1 and drying filter 1-2-2 are provided between shell and tube condenser 1-2 and plate evaporator 1-3; low pressure switch 1-3-1 and low pressure gauge 1-3-2 are provided between compressor 1-1 and plate evaporator 1-3, and high pressure switch 1-1-1 and high pressure gauge are provided between compressor 1-1 and shell and tube condenser 1-2;

[0063] The water circulation piping system 2 includes a water tank 2-1, a circulation pump 2-2, a negative pressure generator 2-3, a solenoid valve 2-4 and a flow meter 2-5;

[0064] The negative pressure generator 2-3 is connected to the external mold 2-3-1 and the plate evaporator 1-3 through a pipeline, and the flow meter 2-5 is set on the pipeline between the external mold 2-3-1 and the negative pressure generator 2-3;

[0065] The water tank 2-1 is connected to the circulation pump 2-2 and the external mold 2-3-1 through a pipeline 2-1;

[0066] The solenoid valve 2-4 is provided on the pipeline connecting the water tank 2-1 and the external mold 2-3-1. The pipeline is also provided with an air inlet 2-4-1 and an air inlet solenoid valve 2-4-2.

[0067] In this embodiment, when cooling the water through the refrigerant piping system 1, the refrigerant enters the compressor 1-1, becomes a high-temperature, high-pressure gas after passing through the compressor 1-1, then passes through the shell and tube condenser 1-2 to become a normal-temperature, high-pressure gas, then passes through the throttle valve to become a low-temperature, low-pressure gas, and finally passes through the plate evaporator 1-3 to absorb heat from the water, thereby achieving the cooling effect;

[0068] When cooling through the water circulation piping system 2, the circulating medium water enters the system through the water tank 2-1, and then is returned to the water tank 2-1 by the circulation pump 2-2 through the plate evaporator 1-3 and the negative pressure generator 2-3, in a reciprocating cycle. In the negative pressure generator 2-3, the negative pressure generator 2-3 has a nozzle and a throat, and water generates a vacuum through the nozzle and the throat. The speed of the water flow through the negative pressure generator 2-3 is the energy to generate the vacuum. The required speed is generated by the pressure difference between the water flow inlet and outlet of the negative pressure generator 2-3. When the external mold 2-3-1 needs to be cooled, the solenoid valve 2-4 is opened, and the water enters the external mold 2-3-1 and then returns to the water tank 2-1. When the external mold 2-3-1 does not need to be cooled, the solenoid valve 2-4 is closed, and the air inlet solenoid valve 2-4-2 is opened, pushing the water in the external mold 2-3-1 back to the water tank 2-1. This ensures that the pipeline of the external mold 2-3-1 is in a water-free state, which plays a safer role.

[0069] The flow meters 2-5 can be used to display the gas flow in the system, so that the user can more intuitively understand the gas flow in the system so that the user can make different responses.

[0070] In a preferred embodiment, the water tank 2-1 includes a water inlet 2-1-1 and an overflow port 2-1-2. The opening and closing of the water inlet 2-1-1 and the overflow port 2-1-2 are controlled by a liquid level switch. The liquid level switch can monitor, control and change the liquid level of the water tank 2-1, and replenish the water in the water tank 2-1 in real time to meet the system cooling requirements.

[0071] In a preferred embodiment, a drain outlet 2-2-1 is provided between the water tank 2-1 and the circulation pump 2-2, and the opening and closing of the drain outlet 2-2-1 is controlled by a ball valve 2-2-2; when the overall pressure in the system exceeds a certain pressure, the ball valve 2-2-2 discharges a portion of the water by controlling the opening and closing of the drain outlet 2-2-1, thereby reducing the pressure inside the system, stabilizing the pressure of the entire system, and ensuring the normal operation of the system.

[0072] A negative pressure water cooling method for a magnesium alloy mold ingate comprises the following steps:

[0073] S1, check whether the negative pressure water cooling system is safe;

[0074] S2, start the circulation pump 2-2, and the system starts running;

[0075] S3, the solenoid valve 2-4 opens, and the water in the water tank 2-1 enters the external mold 2-3-1 through the pipeline;

[0076] S4, the water passing through the external mold 2-3-1 passes through the pipeline and enters the refrigerant pipeline system 1 through the negative pressure generator 2-3 for cooling;

[0077] S5, the cooled water returns to the water tank 2-1 through the negative pressure generator 2-3.

[0078] When starting the circulation pump 2-2, the target temperature must be set so that the machine can be used normally. When the target temperature is lower than the actual temperature, the compressor 1-1 works. When the target temperature is higher than the actual temperature, the compressor 1-1 stops working. During system operation, a single-chip microcomputer is used to receive and transmit data such as temperature and pressure. The single-chip microcomputer processing makes the entire system respond more promptly. Water flows inside the external mold 2-3-1, and the multiple pipes connected to the ball valve 2-2-2 improve the circulation rhythm.

[0079] In a preferred embodiment, S4 comprises the following steps:

[0080] S4.1, water enters compressor 1-1 and turns into high-temperature and high-pressure steam;

[0081] S4.2, the water vapor is cooled by passing through the shell and tube condenser 1-2;

[0082] S4.3, water passes through the drying filter 1-2-2 and the capillary tube 1-2-1 and returns to the plate evaporator 1-3 and then to the water tank 2-1.

[0083] The water vapor passes through the shell and tube condenser 1-2 and becomes a gas at room temperature and high pressure. It then passes through the drying filter 1-2-2 and the capillary tube 1-2-1 and becomes a gas at low temperature and low pressure. Finally, it passes through the plate evaporator 1-3 to absorb the heat in the water, thereby achieving the effect of cooling. The drying filter 1-2-2 can absorb solid impurities and liquid water. The unabsorbed water returns to the plate evaporator 1-3 through the capillary tube 1-2-1 and then to the water tank 2-1 to ensure the normal operation of the water cooling system.

[0084] In a preferred embodiment, in step S4, when the low pressure gauge 1-3-2 or the high pressure gauge detects a pressure lower than or higher than a set value, the low pressure switch 1-3-1 or the high pressure switch 1-1-1 shuts down the system. The low pressure switch 1-3-1 or the high pressure switch 1-1-1 plays a role in safety protection. When the system is lower than a certain pressure or higher than a certain pressure, an alarm is issued and the system is shut down to reduce risks.

[0085] In a preferred embodiment, it also includes S6. When the system finishes working, the solenoid valve 2-4 is closed, the air inlet solenoid valve 2-4-2 is opened, and the water in the system returns to the water tank 2-1, reducing water consumption, reducing the chance of water contacting and reacting with the magnesium alloy, and preventing explosion.

[0086] The beneficial effects of the present invention are:

[0087] 1. The negative pressure generator 2-3 generates a pressure difference between the inlet and outlet through the rotation of the circulation pump 2-2, so that water is circulated in the system to reduce consumption;

[0088] 2. The low-pressure switch 1-3-1 or the high-pressure switch 1-1-1 can sound an alarm and shut down the machine when the pressure is higher or lower than a certain level, thus reducing risks;

[0089] 3. The negative pressure generator 2-3 ensures that even if the external mold 2-3-1 cracks, the cooling water will not come into contact with the magnesium and explode.

[0090] It should be pointed out that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A negative pressure water cooling system for the gate of a magnesium alloy mold, characterized in that: Including refrigerant piping system and water circulation piping system; The refrigerant piping system includes a compressor, a shell and tube condenser and a plate evaporator; The compressor is connected to the shell and tube condenser and the plate evaporator, the shell and tube condenser is connected to the plate evaporator, and a capillary tube and a drying filter are provided between the shell and tube condenser and the plate evaporator; a low pressure switch and a low pressure gauge are provided between the compressor and the plate evaporator, and a high pressure switch and a high pressure gauge are provided between the compressor and the shell and tube condenser; The water circulation piping system includes a water tank, a circulation pump, a negative pressure generator, a solenoid valve and a flow meter; The negative pressure generator is connected to the external mold and the plate evaporator through a pipeline, and the flow meter is arranged on the pipeline between the external mold and the negative pressure generator; The water tank is connected to the circulation pump and the external mold through a pipeline; The solenoid valve is arranged on a pipeline connecting the water tank and the external mold, and the pipeline is also provided with an air inlet and an air inlet solenoid valve; The water tank includes a water inlet and an overflow port, and the opening and closing of the water inlet and the overflow port are controlled by a liquid level switch; A drain outlet is provided between the water tank and the circulation pump, and the opening and closing of the drain outlet is controlled by a ball valve.

2. A method for negative pressure water cooling of a magnesium alloy mold ingate, using the negative pressure water cooling system for a magnesium alloy mold ingate according to claim 1, characterized in that: The steps include: S1, check whether the negative pressure water cooling system is safe; S2, start the circulation pump and the system starts running; S3, the solenoid valve opens, and the water in the water tank enters the external mold through the pipeline; S4, the water passing through the external mold is passed through the pipeline and the negative pressure generator into the refrigerant pipeline system for cooling; S5, the cooled water returns to the water tank through the negative pressure generator.

3. The method according to claim 2, a negative pressure water cooling method for the gate of a magnesium alloy mold, characterized in that: Said S4 comprises the following steps: S4.1, water enters the compressor and turns into high-temperature and high-pressure water vapor; S4.2, the water vapor is cooled by passing through a shell and tube condenser; S4.3, the water returns to the plate evaporator through the drying filter and capillary tube and then returns to the water tank.

4. The method according to claim 3, characterized in that In step S4, when the pressure detected by the low pressure gauge or the high pressure gauge is lower or higher than the set value, the low pressure switch or the high pressure switch shuts down the system.

5. The method according to claim 4, characterized in that It also includes S6. When the system finishes working, the solenoid valve is closed, the air inlet solenoid valve is opened, and the water in the system returns to the water tank.

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