Defoamer of engine cooling system, defoaming method and defoaming rate verification method

Abstract

The invention discloses an engine cooling system defoamer, a defoaming method and a defoaming rate calibration method.The mixed liquid of foam and cooling liquid in the defoamer enters a defoaming pipe through a foam suction pipe and a casing pipe, high-pressure gas enters a spiral casing pipe through a gas inlet pipe and an outer pipe, a spiral hole channel is formed in the spiral casing pipe, and the spiral hole channel is communicated with the foam suction pipe and the casing pipe; high-pressure gas generates shearing force after passing through the spiral hole channel to enter the defoaming pipe to assist defoaming, and the high-pressure gas forms a back pressure effect in the defoaming pipe, so that foam in the mixed liquid is expanded and broken under the back pressure effect of the high-pressure gas; the working stability of the cooling system is guaranteed, the property of the cooling liquid is not affected to the maximum extent, and it is guaranteed that the defoaming capacity is exerted; the process of synchronously using the defoaming agent when the cooling liquid is used is replaced, and the extra cost of continuously using the defoaming agent subsequently is saved.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle engine cooling, and in particular to a defoamer, a defoaming method and a defoaming rate verification method for an engine cooling system. Background Art

[0002] The engine cooling system is generally divided into water cooling and air cooling. Most automobile engines use water cooling systems. As the circulating medium in the water cooling system, the coolant is the key to the system's operation. The generation of foam will have a great impact on its operation. How to effectively eliminate foam is one of the important factors to ensure the stable operation of the cooling system.

[0003] There are many reasons for the generation of foam, including but not limited to: during the coolant processing, the stirring vibration of mechanical equipment will cause a large amount of air to be drawn in, and these gases are difficult to escape and form foam; automobile coolant is made of some chemical components, and foaming surfactants may be added during the process; wear of engine cooling system parts causes air to enter the cooling system and generate foam. The generation of foam will affect the cooling and antifreeze properties of the coolant, affect the regulation of the coolant temperature, and fail to absorb and dissipate heat in time; the bubbles generated by the coolant will directly affect the failure of the injection pump, incorrect fuel supply timing, and will also cause the coolant fan to operate abnormally, resulting in fan damage, etc.

[0004] There are many ways to defoam, such as chemical defoaming, mechanical defoaming, etc. The most widely used method for water cooling systems is chemical defoaming, which is to add defoaming agents to the coolant. It achieves the effect of defoaming and foam suppression by changing the surface tension of the foam according to the cause of the foam. At present, there are some inconveniences in the chemical defoaming method: First, the defoaming agent is highly targeted, and a defoaming agent can only be effective on one or several foam systems. Therefore, it is necessary to choose the correct type of defoaming agent to achieve the ideal effect, that is, the user needs to conduct sample tests; in addition, the defoaming agent, as a chemical reagent, may have chemical components that have a certain effect on the coolant depending on the type. For example, a chemical reaction will cause a certain change in the performance of the coolant or cause the defoaming ability of the defoaming agent to decrease or even lose, increasing additional costs; finally, the defoaming agent is mixed with the coolant, and the daily use cost is increased compared to the cost of using only the coolant. The above problems need to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide an engine cooling system defoamer, a defoaming method and a defoaming rate verification method. A mechanical defoaming method is selected, and a mechanical defoamer structure is added to the radiator water tank for defoaming treatment. Under the premise of not affecting the properties of the coolant itself and the defoaming effect, the purpose of eliminating foam is achieved at a relatively low cost, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an engine cooling system defoamer, used for defoaming coolant in the engine cooling system, comprising:

[0007] A bubble suction tube and a sleeve, wherein the sleeve is connected to the bubble suction tube, the sleeve comprises a connecting portion, and a radiator water inlet pipe in an engine cooling system is connected to the bubble suction tube;

[0008] A defoaming tube connected to the sleeve;

[0009] A diffusion pipe, the diffusion pipe is connected to the defoaming pipe, and the diffusion pipe is connected to a radiator of an engine cooling system;

[0010] an outer tube and an air inlet tube, wherein the air inlet tube is connected to the outer tube;

[0011] A spiral sleeve, wherein the outer tube is connected to the spiral sleeve, the spiral sleeve is connected to the defoaming tube, the spiral sleeve is provided with a mounting hole, and the sleeve and the spiral sleeve are connected by embedding the outer wall of the connecting portion into the mounting hole;

[0012] The mixture of foam and coolant enters the defoaming tube through the bubble suction tube and the sleeve, and the high-pressure gas enters the spiral sleeve through the air inlet pipe and the outer tube. The spiral sleeve is provided with a spiral channel. After the high-pressure gas passes through the spiral channel, shear force is generated to enter the defoaming tube to assist defoaming. The high-pressure gas forms a back pressure in the defoaming tube, so that the foam in the mixed liquid expands and bursts under the back pressure of the high-pressure gas.

[0013] Further, a first connecting flange, wherein the first connecting flange comprises an upper connecting flange and a lower connecting flange, wherein the upper connecting flange and the lower connecting flange are connected, wherein the upper connecting flange is connected to the bubble suction tube, and wherein the lower connecting flange is connected to the sleeve and the outer tube respectively;

[0014] The second connecting flange comprises an outer tube connecting flange and a diffuser connecting flange, the outer tube connecting flange and the diffuser connecting flange are connected, the outer tube connecting flange is connected to the outer tube, and the diffuser connecting flange is connected to the diffuser.

[0015] Furthermore, the defoaming pipe also includes a nozzle structure, and the nozzle structure includes:

[0016] A stabilizing section, wherein the mixed liquid enters the stabilizing section through a casing, and the high-pressure gas enters the stabilizing section through the spiral channel;

[0017] A contraction section, wherein the contraction section is connected to the stabilization section, and the connection point is a starting end;

[0018] An expansion section, wherein the expansion section is connected to the contraction section, and the connection point is the end;

[0019] The contraction section is an arc convex inwardly, contracting and extending from the starting end to the end, and the end forms a throat. The expansion section at least partially forms an arc convex inwardly, and expands and extends from the throat to a direction away from the throat.

[0020] In another aspect, an engine cooling system is provided, comprising:

[0021] A defoamer, which is used for defoaming coolant in an engine cooling system;

[0022] A radiator, wherein the defoamer is connected to a radiator of an engine cooling system;

[0023] A radiator water inlet pipe, the defoamer is connected to the radiator water inlet pipe;

[0024] High-pressure gas is introduced into the defoamer, and the coolant with foam flows into the defoamer through the radiator water inlet pipe. The high-pressure gas enters the defoamer, forming back pressure and shear force in the defoamer, so that the foam in the coolant with foam expands and bursts under the back pressure and shear force of the high-pressure gas.

[0025] Furthermore, it also includes:

[0026] A first ventilation pipe, one end of which is connected to the top of the radiator;

[0027] An expansion water tank, the other end of the vent pipe being connected to the expansion water tank;

[0028] A radiator water outlet pipe, one end of which is connected to the bottom of the radiator;

[0029] A return pipe, wherein the return pipe is connected to the expansion water tank and the radiator water outlet pipe respectively;

[0030] A water pump connected to the other end of the radiator water outlet pipe;

[0031] A thermostat, the thermostat being connected to the water pump and the thermostat being connected to the other end of the radiator water inlet pipe;

[0032] A second vent pipe, wherein the thermostat is connected to the expansion water tank via the second vent pipe.

[0033] In another aspect, a method for defoaming an engine cooling system is provided, comprising:

[0034] A defoamer is arranged between the radiator water inlet pipe and the radiator;

[0035] A convex inner wall with a front end contracted and a rear end expanded is arranged in the defoamer;

[0036] High-pressure gas is introduced into the defoamer to form a high-speed jet of high-pressure gas in the defoamer;

[0037] After the convex inner wall acts on the high-speed jet, the high-speed jet produces a wall attachment effect, and the high-speed jet flows along the wall surface of the convex inner wall through the wall attachment effect, forming a vacuum area in the center of the defoamer;

[0038] When the coolant with foam passes into the defoamer, the vacuum area absorbs the foam into the defoamer, and under the action of the internal and external pressure difference, the foam fluid flowing through the vacuum area expands and ruptures;

[0039] The defoamer is provided with a diffusion pipe, through which the treated liquid is discharged.

[0040] Furthermore, after the convex inner wall acts on the high-speed jet, the high-speed jet produces a wall attachment effect, and the high-speed jet flows along the wall surface of the convex inner wall through the wall attachment effect, forming a vacuum area in the center of the defoamer, and further comprising:

[0041] The throat with the smallest cross-sectional area in the injection pipeline of the defoamer is between the front end where the convex inner wall contracts and the rear end where it expands. After the airflow reaches supersonic speed in the throat, the airflow velocity will continue to increase in the expansion section due to the increase in the cross-sectional area of ​​the flow, thereby increasing the negative pressure range and size inside the defoamer and improving the defoaming rate. The airflow velocity and the cross-sectional area are calculated as follows:

[0042]

[0043] In the formula, M is the Mach number, V is the air flow velocity, and S is the cross-sectional area through which the gas passes. When M>1, it is supersonic, and the air flow velocity V increases with the increase of the cross-sectional area.

[0044] In another aspect, a method for verifying defoaming rate of an engine cooling system is provided, comprising:

[0045] Set the defoaming condition of the engine cooling system;

[0046] Collect the total volume of the mixed liquid containing foam and coolant before defoaming, as well as the total volume of the fluid and the volume of the coolant of pure liquid after defoaming;

[0047] Calculate the defoaming rate after treatment, where the defoaming rate calculation formula is:

[0048]

[0049] Where η is the defoaming efficiency, V0 is the total volume of the mixed liquid before defoaming, V1 is the total volume of the fluid in the container after defoaming, l1 is the volume of pure liquid after defoaming, and α is the foam gas-liquid ratio;

[0050] The defoaming effect was evaluated by the defoaming rate, wherein the higher the defoaming rate, the better the defoaming effect.

[0051] Furthermore, the method further includes calculating the defoaming rate according to the liquid density before and after defoaming, wherein the defoaming rate calculation formula according to the liquid density is obtained according to formula (2) and formula (3):

[0052]

[0053] Where ρ1 is the foam density before defoaming, and ρ0 is the density of the mixed liquid after defoaming.

[0054] In another aspect, a defoaming rate calibration device for an engine cooling system is provided, comprising:

[0055] A first air supply module and a foam generating module, wherein the first air supply module and the foam generating module are connected, and the first air supply module fills the foam generating module with gas to generate a mixed solution of foam and coolant in the foam generating module having coolant;

[0056] A second air supply module and a mechanical defoaming module, wherein the second air supply module injects high-pressure gas into the mechanical defoaming module, and the foam generating module injects a mixed solution of foam and coolant into the mechanical defoaming module, the mixed solution is defoamed in the mechanical defoaming module, and the defoamed mixed solution is verified, and the defoaming rate of the defoamed mixed solution is determined by verification;

[0057] A water storage module, used to store the calibrated mixed solution;

[0058] The driving module is used to send the mixed solution in the water storage module into the foam generating module.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] 1. The present invention fully increases the versatility of defoaming, optimizes the process of selecting a suitable defoaming agent in the early stage, improves convenience and reduces costs.

[0061] 2. The present invention ensures the working stability of the cooling system, does not affect the properties of the coolant to the greatest extent and ensures the defoaming ability.

[0062] 3. The present invention replaces the process of using a defoaming agent simultaneously with the use of a coolant, thereby saving the additional cost of the subsequent continuous use of the defoaming agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a schematic diagram of the structure of a defoamer in an embodiment of the present invention;

[0064] Figure 2 This is an exploded schematic diagram of the defoamer structure in an embodiment of the present invention;

[0065] Figure 3 Schematic diagram of the nozzle structure of the defoaming pipe in an embodiment of the present invention;

[0066] Figure 4 A schematic diagram of the structure connection of the engine cooling system in an embodiment of the present invention;

[0067] Figure 5 It is a connection schematic diagram of the defoaming rate calibration device of the engine cooling system in an embodiment of the present invention.

[0068] In the figure: 10, defoamer; 20, expansion tank; 30, radiator; 40, water pump; 50, return pipe; 60, thermostat; 11, bubble suction pipe; 12, first connecting flange; 13, sleeve; 14, spiral sleeve; 15, defoaming pipe; 16, outer pipe; 17, second connecting flange; 18, diffuser; 19, air inlet pipe; 21, first ventilation pipe; 22, second ventilation pipe; 31, radiator water inlet pipe; 32, radiator water outlet pipe; 121, upper flange connection; 122, lower flange connection; 131, connecting part; 141, mounting hole; 311, inlet joint; 161, sealing ring; 171, outer pipe connecting flange; 172, diffuser connecting flange. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0071] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] Please refer to the attached drawings of the specification, the present invention provides a technical solution: Figure 1 and 2 As shown, an engine cooling system defoamer is used for defoaming coolant in the engine cooling system. The defoamer 10 includes:

[0073] A bubble suction tube 11 and a sleeve 13, wherein the sleeve 13 is connected to the bubble suction tube 11, and the sleeve 13 includes a connecting portion 131, and a radiator water inlet pipe 31 in the engine cooling system is connected to the bubble suction tube 11;

[0074] A defoaming tube 15, wherein the defoaming tube 15 is connected to the sleeve 13;

[0075] A diffusion pipe 18, wherein the diffusion pipe 18 is connected to the defoaming pipe 15, and the diffusion pipe 18 is connected to a radiator 30 of an engine cooling system;

[0076] An outer tube 16 and an air inlet pipe 19, wherein the air inlet pipe 19 is connected to the outer tube 16;

[0077] The spiral sleeve 14, the outer tube 16 is connected to the spiral sleeve 14, the spiral sleeve 14 is connected to the defoaming tube 15, the spiral sleeve 14 is provided with a mounting hole 141, and the sleeve 13 and the spiral sleeve 14 are connected by embedding the outer wall of the connecting part 131 into the mounting hole 141;

[0078] The mixture of foam and coolant enters the defoaming tube 15 through the bubble suction tube 11 and the sleeve 13, and the high-pressure gas enters the spiral sleeve 14 through the air inlet pipe 19 and the outer tube 16. The spiral sleeve 14 is provided with a spiral channel. After the high-pressure gas passes through the spiral channel, shear force is generated and enters the defoaming tube 15 to assist in defoaming. The high-pressure gas forms a back pressure in the defoaming tube 15, so that the foam in the mixed liquid expands and ruptures under the back pressure of the high-pressure gas.

[0079] In this embodiment, the radiator water inlet pipe 31 is connected to the bubble suction tube 11 through the inlet joint 311; in order to ensure the airtightness of each connection part, a sealing structure is also provided for sealing, and preferably the sealing structure is a sealing ring 161; the present invention introduces a defoaming method in an engine cooling system, and a mechanical defoaming method is selected. There are many types of mechanical defoamers. The present invention selects a slit type defoamer, which has the advantages of a higher defoaming rate and a larger defoaming amount. A mechanical defoamer is added to the radiator water tank for defoaming treatment. Under the premise of not affecting the properties of the coolant itself and the defoaming effect, the purpose of eliminating foam is achieved at a lower cost.

[0080] Preferably, the first connecting flange 12 comprises an upper connecting flange 121 and a lower connecting flange 122, the upper connecting flange 121 and the lower connecting flange 122 are connected, the upper connecting flange 121 is connected to the bubble suction tube 11, and the lower connecting flange 122 is respectively connected to the sleeve 13 and the outer tube 16;

[0081] The second connecting flange 17 includes an outer tube connecting flange 171 and a diffuser connecting flange 172. The outer tube connecting flange 171 and the diffuser connecting flange 172 are connected. The outer tube connecting flange 171 is connected to the outer tube 16, and the diffuser connecting flange 172 is connected to the diffuser 18.

[0082] Preferably, the defoaming pipe 15 further includes a nozzle structure, and the nozzle structure includes:

[0083] A stabilizing section, wherein the mixed liquid enters the stabilizing section through a casing, and the high-pressure gas enters the stabilizing section through the spiral channel;

[0084] A contraction section, wherein the contraction section is connected to the stabilization section, and the connection point is a starting end;

[0085] An expansion section, wherein the expansion section is connected to the contraction section, and the connection point is the end;

[0086] The contraction section is an arc convex inwardly, contracting and extending from the starting end to the end, and the end forms a throat. The expansion section at least partially forms an arc convex inwardly, and expands and extends from the throat to a direction away from the throat.

[0087] In the above embodiment, the mechanical defoamer defoams by forming a supersonic high-speed jet of high-pressure gas in the defoamer to impact the foam, thereby generating shear force on the surface of the foam liquid film to destroy the structure of the liquid film; under the suction effect of the high-speed jet belt, a negative pressure is generated in the foam channel, causing the foam to expand and burst under the pressure difference between the inside and outside, and the key structure that plays a role is the nozzle structure.

[0088] In another aspect, an engine cooling system is provided, comprising:

[0089] A defoamer 10, wherein the defoamer 10 is used for defoaming the coolant in the engine cooling system;

[0090] A radiator 30, wherein the defoamer 10 is connected to the radiator 30 of the engine cooling system;

[0091] A radiator water inlet pipe 31, the defoamer 10 is connected to the radiator water inlet pipe 31;

[0092] High-pressure gas is introduced into the defoamer, and the coolant with foam flows into the defoamer 10 through the radiator water inlet pipe 31. The high-pressure gas enters the defoamer 10, forming back pressure and shear force in the defoamer, so that the foam in the coolant with foam expands and bursts under the back pressure and shear force of the high-pressure gas.

[0093] Preferably, it also includes:

[0094] A first ventilation pipe 21, one end of which is connected to the top of the radiator 30;

[0095] an expansion water tank 20, wherein the other end of the first vent pipe 21 is connected to the expansion water tank 20;

[0096] A radiator water outlet pipe 32, one end of which is connected to the bottom of the radiator 30;

[0097] A return pipe 50, wherein the return pipe 50 is connected to the expansion water tank 20 and the radiator water outlet pipe 32 respectively;

[0098] A water pump 40, wherein the water pump 40 is connected to the other end of the radiator water outlet pipe 32;

[0099] Thermostat 60, the thermostat 60 is connected to the water pump 40, and the thermostat 60 is connected to the other end of the radiator water inlet pipe 31;

[0100] The second ventilation pipe 22 , the thermostat 60 is connected to the expansion water tank 20 via the second ventilation pipe 22 .

[0101] In the above embodiment, first, the coolant is added to the cooling system through the expansion tank, and under the action of the water pump, the coolant is pumped out and circulates in the cooling system. The circulation path of the coolant is controlled by the thermostat. Under the large circulation, when the coolant temperature exceeds the specified value, the main valve of the thermostat opens and the auxiliary valve closes, and the coolant all passes through the radiator. The coolant after heat dissipation returns to the cylinder water jacket under the suction action of the water pump, flows into the water jacket of the cylinder head through the flat water hole on the cylinder body, and then flows into the radiator from the cylinder head water outlet pipe, that is, the radiator water inlet pipe, to form a complete circulation system;

[0102] Specifically, under the large-cycle working condition of the present invention: the coolant enters the radiator from the cylinder head drain pipe through the thermostat, first passes through the mechanical defoamer connected to the cylinder head drain pipe for defoaming treatment, and then cools down and dissipates heat in the radiator. After the heat dissipation work is completed, it returns to the cylinder water jacket under the suction action of the water pump, and then enters the cylinder head water jacket along the water hole on the cylinder body, and finally flows from the cylinder head water outlet pipe through the thermostat again back to the radiator, and the cycle is repeated. The coolant will be defoamed before the heat dissipation work in each cycle; the normal cooling system is to adjust the pressure and realize gas-liquid separation through the expansion water tank. Under the coordinated work of the high-pressure gas, when the pressure increases, most of the gas in the radiator will be transferred from the radiator to the expansion water tank through the vent pipe, and a part of the water vapor will be liquefied when cooled and flow back to the cooling system through the reflux pipe to continue circulation, and the other part will be discharged into the air through the structure above the water tank.

[0103] In another aspect, a method for defoaming an engine cooling system is provided, comprising the following steps:

[0104] A defoamer is arranged between the radiator water inlet pipe and the radiator;

[0105] A convex inner wall with a front end contracted and a rear end expanded is arranged in the defoamer;

[0106] High-pressure gas is introduced into the defoamer to form a high-speed jet of high-pressure gas in the defoamer;

[0107] After the convex inner wall acts on the high-speed jet, the high-speed jet produces a wall attachment effect, and the high-speed jet flows along the wall surface of the convex inner wall through the wall attachment effect, forming a vacuum area in the center of the defoamer;

[0108] When the coolant with foam passes into the defoamer, the vacuum area absorbs the foam into the defoamer, and under the action of the internal and external pressure difference, the foam fluid flowing through the vacuum area expands and ruptures;

[0109] The defoamer is provided with a diffusion pipe, through which the treated liquid is discharged.

[0110] In the above embodiment, during normal operation, a mixture of foam and working liquid enters the defoamer structure through the inlet interface, and high-pressure gas enters the defoamer through the air inlet pipe. The two are in contact and mixed in the defoamer tube. The main defoaming work is carried out in the defoamer tube. When the high-pressure gas enters the defoamer tube, a high-speed jet is formed. On the one hand, the high-speed jet is used to impact the foam to generate shear force, thereby shearing and breaking the foam; on the other hand, due to the flow characteristics of the fluid, a wall attachment effect will be generated when the high-speed jet encounters a convex surface, that is, the gas in the defoamer flows along the raised wall surface inside the defoamer, and a larger vacuum area is formed in the center to suck the foam into the defoamer. Under the action of the internal and external pressure difference, the foam fluid will expand and burst when flowing through this area, and the treated liquid will be discharged through the diffusion tube.

[0111] Specifically, after the convex inner wall acts on the high-speed jet, the high-speed jet produces a wall attachment effect, and the high-speed jet flows along the wall surface of the convex inner wall through the wall attachment effect, forming a vacuum area in the center of the defoamer, and also includes:

[0112] The throat with the smallest cross-sectional area in the injection pipeline of the defoamer is between the front end where the convex inner wall contracts and the rear end where it expands. After the airflow reaches supersonic speed in the throat, the airflow velocity will continue to increase in the expansion section due to the increase in the cross-sectional area of ​​the flow, thereby increasing the negative pressure range and size inside the defoamer and improving the defoaming rate. The airflow velocity and the cross-sectional area are calculated as follows:

[0113]

[0114] Where M is the Mach number, V is the air velocity, and S is the cross-sectional area through which the gas passes.

[0115] In the above embodiment, negative pressure is generated in the foam channel under the suction effect of the high-speed jet belt, causing the foam to expand and burst under the pressure difference between the inside and the outside. The key structure that plays a role is the nozzle structure. The mechanical defoamer defoams by forming a supersonic high-speed jet of high-pressure gas in the defoamer to impact the foam, and generates shear force on the surface of the foam liquid film to destroy the structure of the liquid film. When M>1, it is supersonic, and the air flow velocity V increases with the increase of the cross-sectional area.

[0116] In another aspect, a method for verifying defoaming rate of an engine cooling system is provided, comprising:

[0117] Set the defoaming condition of the engine cooling system;

[0118] Collect the total volume of the mixed liquid containing foam and coolant before defoaming, as well as the total volume of the fluid and the volume of the coolant of pure liquid after defoaming;

[0119] Calculate the defoaming rate after treatment, where the defoaming rate calculation formula is:

[0120]

[0121] Where η is the defoaming efficiency, V0 is the total volume of the mixed liquid before defoaming, V1 is the total volume of the fluid in the container after defoaming, l1 is the volume of pure liquid after defoaming, and α is the foam gas-liquid ratio;

[0122] The defoaming effect was evaluated by the defoaming rate, wherein the higher the defoaming rate, the better the defoaming effect.

[0123] Specifically, it also includes calculating the defoaming rate according to the liquid density before and after defoaming, wherein the defoaming rate calculation formula according to the liquid density is obtained according to formula (2) and formula (3):

[0124]

[0125] Where ρ1 is the foam density before defoaming, and ρ0 is the density of the mixed liquid after defoaming.

[0126] On the other hand, Figure 5 As shown, a defoaming rate calibration device for an engine cooling system is provided, comprising:

[0127] A first air supply module and a foam generating module, wherein the first air supply module and the foam generating module are connected, and the first air supply module fills the foam generating module with gas to generate a mixed solution of foam and coolant in the foam generating module having coolant;

[0128] A second air supply module and a mechanical defoaming module, wherein the second air supply module injects high-pressure gas into the mechanical defoaming module, and the foam generating module injects a mixed solution of foam and coolant into the mechanical defoaming module, the mixed solution is defoamed in the mechanical defoaming module, and the defoamed mixed solution is verified, and the defoaming rate of the defoamed mixed solution is determined by verification;

[0129] A water storage module, used to store the calibrated mixed solution;

[0130] The driving module is used to send the mixed solution in the water storage module into the foam generating module.

[0131] In the above embodiments, preferably, the first air supply module and the second air supply module are air supply bottles, the foam generating module is a foam generator, the mechanical defoaming module is a mechanical defoamer, the water storage module is a water tank of the radiator, and the driving module is a water pump; under the simulated working condition, the high-pressure gas is respectively input into the air inlet pipes of the foam generator and the defoamer through the air supply bottle, and the gas enters the foam generator to simulate the generation of foam. The gas enters the air inlet pipe to fulfill the necessary conditions for defoaming work. Water is transported to the foam generator through the water pump, and foam is generated under the action of the high-pressure gas and enters the defoamer through the inlet interface. When the mixed liquid contacts the high-pressure gas, defoaming is performed according to the working principle of the defoamer and the treated liquid is output through the diffusion tube, and the mixed liquid circulates and works under the action of the water pump. When actually working in the cooling system, the mechanical defoaming structure is installed in the radiator water tank at the connection with the cylinder head water outlet pipe, so that the coolant passes through the defoamer before entering the radiator for heat dissipation treatment, that is, the coolant for heat dissipation is the liquid after defoaming treatment. At the same time, a pipeline is led out from the compressor structure and connected to the air inlet pipe of the defoamer to provide the high-pressure gas required to generate the negative pressure difference inside and outside the foam. Everything is ready, and the defoaming work is carried out according to the above principle. The treated liquid continues to circulate inside the cooling system along the pipeline.

[0132] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An engine cooling system defoamer, used for defoaming coolant in an engine cooling system, characterized in that: include: A bubble suction tube and a sleeve, wherein the sleeve is connected to the bubble suction tube, the sleeve comprises a connecting portion, and a radiator water inlet pipe in an engine cooling system is connected to the bubble suction tube; A defoaming tube connected to the sleeve; A diffusion pipe, the diffusion pipe is connected to the defoaming pipe, and the diffusion pipe is connected to a radiator of an engine cooling system; an outer tube and an air inlet tube, wherein the air inlet tube is connected to the outer tube; A spiral sleeve, wherein the outer tube is connected to the spiral sleeve, the spiral sleeve is connected to the defoaming tube, the spiral sleeve is provided with a mounting hole, and the sleeve and the spiral sleeve are connected by embedding the outer wall of the connecting portion into the mounting hole; The mixture of foam and coolant enters the defoaming tube through the bubble suction tube and the sleeve, and the high-pressure gas enters the spiral sleeve through the air inlet pipe and the outer tube. The spiral sleeve is provided with a spiral channel. After the high-pressure gas passes through the spiral channel, shear force is generated to enter the defoaming tube to assist defoaming. The high-pressure gas forms a back pressure in the defoaming tube, so that the foam in the mixed liquid expands and bursts under the back pressure of the high-pressure gas.

2. The engine cooling system defoamer according to claim 1, characterized in that: Also includes: A first connecting flange, wherein the first connecting flange comprises an upper connecting flange and a lower connecting flange, wherein the upper connecting flange is connected to the lower connecting flange, the upper connecting flange is connected to the bubble suction tube, and the lower connecting flange is connected to the sleeve and the outer tube respectively; The second connecting flange comprises an outer tube connecting flange and a diffuser connecting flange, the outer tube connecting flange and the diffuser connecting flange are connected, the outer tube connecting flange is connected to the outer tube, and the diffuser connecting flange is connected to the diffuser.

3. The engine cooling system defoamer according to claim 1, characterized in that: The defoaming pipe also includes a nozzle structure, and the nozzle structure includes: A stabilizing section, wherein the mixed liquid enters the stabilizing section through a casing, and the high-pressure gas enters the stabilizing section through the spiral channel; A contraction section, wherein the contraction section is connected to the stabilization section, and the connection point is a starting end; An expansion section, wherein the expansion section is connected to the contraction section, and the connection point is the end; The contraction section is an arc convex inwardly, contracting and extending from the starting end to the end, and the end forms a throat. The expansion section at least partially forms an arc convex inwardly, and expands and extends from the throat to a direction away from the throat.

4. An engine cooling system, characterized in that: include: A defoamer, which is used for defoaming coolant in an engine cooling system; A radiator, wherein the defoamer is connected to a radiator of an engine cooling system; A radiator water inlet pipe, the defoamer is connected to the radiator water inlet pipe; High-pressure gas is introduced into the defoamer, and the coolant with foam flows into the defoamer through the radiator water inlet pipe. The high-pressure gas enters the defoamer, forming back pressure and shear force in the defoamer, so that the foam in the coolant with foam expands and bursts under the back pressure and shear force of the high-pressure gas.

5. An engine cooling system according to claim 4, characterized in that: Also includes: A first ventilation pipe, one end of which is connected to the top of the radiator; An expansion water tank, the other end of the vent pipe being connected to the expansion water tank; A radiator water outlet pipe, one end of which is connected to the bottom of the radiator; A return pipe, wherein the return pipe is connected to the expansion water tank and the radiator water outlet pipe respectively; A water pump connected to the other end of the radiator water outlet pipe; A thermostat, the thermostat being connected to the water pump and the thermostat being connected to the other end of the radiator water inlet pipe; A second vent pipe, wherein the thermostat is connected to the expansion water tank via the second vent pipe.

6. A defoaming method for an engine cooling system, characterized in that: include: A defoamer is arranged between the radiator water inlet pipe and the radiator; A convex inner wall with a front end contracted and a rear end expanded is arranged in the defoamer; High-pressure gas is introduced into the defoamer to form a high-speed jet of high-pressure gas in the defoamer; After the convex inner wall acts on the high-speed jet, the high-speed jet produces a wall attachment effect, and the high-speed jet flows along the wall surface of the convex inner wall through the wall attachment effect, forming a vacuum area in the center of the defoamer; When the coolant with foam passes into the defoamer, the vacuum area absorbs the foam into the defoamer, and under the action of the internal and external pressure difference, the foam fluid flowing through the vacuum area expands and ruptures; The defoamer is provided with a diffusion pipe, through which the treated liquid is discharged.

7. The defoaming method of an engine cooling system according to claim 6, characterized in that: After the convex inner wall acts on the high-speed jet, the high-speed jet produces a wall attachment effect, and the high-speed jet flows along the wall surface of the convex inner wall through the wall attachment effect, forming a vacuum area in the center of the defoamer, and also includes: The throat with the smallest cross-sectional area in the injection pipeline of the defoamer is between the front end where the convex inner wall contracts and the rear end where it expands. After the airflow reaches supersonic speed in the throat, the airflow velocity will continue to increase in the expansion section due to the increase in the cross-sectional area of ​​the flow, thereby increasing the negative pressure range and size inside the defoamer and improving the defoaming rate. The airflow velocity and the cross-sectional area are calculated as follows: In the formula, M is the Mach number, V is the air flow velocity, and S is the cross-sectional area through which the gas passes. When M>1, it is supersonic, and the air flow velocity V increases with the increase of the cross-sectional area.

8. A method for verifying the defoaming rate of an engine cooling system, characterized in that: include: Set the defoaming condition of the engine cooling system; Collect the total volume of the mixed liquid containing foam and coolant before defoaming, as well as the total volume of the fluid and the volume of the coolant of pure liquid after defoaming; Calculate the defoaming rate after treatment, where the defoaming rate calculation formula is: Where η is the defoaming efficiency, V0 is the total volume of the mixed liquid before defoaming, V1 is the total volume of the fluid in the container after defoaming, l1 is the volume of pure liquid after defoaming, and α is the foam gas-liquid ratio; The defoaming effect was evaluated by the defoaming rate, wherein the higher the defoaming rate, the better the defoaming effect.

9. The defoaming method of an engine cooling system according to claim 8, characterized in that: The method also includes calculating the defoaming rate according to the liquid density before and after defoaming, wherein the defoaming rate calculation formula according to the liquid density is obtained according to formula (2) and formula (3): Where ρ1 is the foam density before defoaming, and ρ0 is the density of the mixed liquid after defoaming.

10. A defoaming rate calibration device for an engine cooling system, characterized in that: include: A first air supply module and a foam generating module, wherein the first air supply module and the foam generating module are connected, and the first air supply module fills the foam generating module with gas to generate a mixed solution of foam and coolant in the foam generating module having coolant; A second air supply module and a mechanical defoaming module, wherein the second air supply module injects high-pressure gas into the mechanical defoaming module, and the foam generating module injects a mixed solution of foam and coolant into the mechanical defoaming module, the mixed solution is defoamed in the mechanical defoaming module, and the defoamed mixed solution is verified, and the defoaming rate of the defoamed mixed solution is determined by verification; A water storage module, used to store the calibrated mixed solution; The driving module is used to send the mixed solution in the water storage module into the foam generating module.

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