CN217152098U

CN217152098U - Vehicle liquid circulation system and vehicle

Info

Publication number: CN217152098U
Application number: CN202220565057.6U
Authority: CN
Inventors: 杨李辰; 王熙熙; 李二鑫; 李嘉; 赵俊杰; 刘月月; 江润东
Original assignee: Yutong Bus Co Ltd
Current assignee: Yutong Bus Co Ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-08-09
Anticipated expiration: 2032-03-15

Abstract

The utility model relates to a vehicle liquid flow circulation system and a vehicle, which comprises an expansion water tank, a first water pump and a plurality of components positioned on a circulation pipeline, wherein at least one component is positioned higher than the expansion water tank in the system; the highest position of the circulating pipeline is connected with the expansion water tank through an air overflow pipe; the expansion water tank is also connected with the circulating pipeline through a liquid supplementing pipe, and the first water pump is arranged on the circulating pipeline at the downstream of the connection point of the liquid supplementing pipe and the circulating pipeline; the inner cavity of the expansion water tank is provided with a liquid seal cabin communicated with the inner cavity of the expansion water tank, the liquid seal cabin is provided with a communication port connected with the expansion water tank, one end of the gas overflow pipe extends into the liquid seal cabin, and the pipe orifice is lower than the communication port. The air overflow pipe comprises a high-level pipeline connected with the highest position of the circulating pipeline, a U-shaped pipeline and an expansion pipeline connected with the expansion water tank; one end of the U-shaped pipeline is connected with the high-level pipeline, the other end of the U-shaped pipeline is connected with the expansion pipeline, and the lowest section of the U-shaped pipeline is lower than the lowest point of the cooling liquid level of the expansion water tank in height.

Description

Vehicle liquid circulation system and vehicle

Technical Field

The utility model relates to a vehicle liquid circulation system and vehicle belongs to liquid circulation system field.

Background

The expansion water tank is used as one of key parts in the liquid flow circulating system, and plays key roles of adjusting pressure fluctuation in the system, providing expansion space for the system, realizing liquid supplementing and adding of the system, realizing gas-liquid separation of the system and the like. At present, each main engine plant selects to arrange the expansion water tank at the highest point in the liquid flow circulating system where the expansion water tank is located, and a certain height difference is formed between the expansion water tank and the plane where the water pump is located, so that the system can conveniently replenish liquid and smoothly discharge residual air in the system.

For passenger cars, all parts in the liquid flow circulation are arranged on the front cabin and the chassis of the car, and the expansion water tank is arranged at the highest point of the system, so that the filling convenience of the system is not influenced. For some commercial vehicle types, such as pure electric buses, fuel cell buses and the like, the arrangement space of the whole vehicle is limited, and parts (such as batteries, radiators, plate heat exchangers and the like) in a part of the liquid flow circulation system need to be placed at the highest point of the roof. According to the existing expansion water tank arrangement principle, in order to ensure that the expansion water tank is arranged at the highest point of the liquid flow circulating system, the expansion water tank also needs to be arranged on the roof of the vehicle. The general automobile body height of commercial car is higher, and expansion tank arranges at the roof, has following problem:

1) the liquid flow circulating system has low filling efficiency. The height of the commercial vehicle body is usually more than 2m, the expansion tank is placed on the roof, the cooling liquid needs to climb to the roof for filling, and the time of single filling is increased by more than 5 Min.

2) The operational safety risk is high. Under the premise of no safety protection measures, the vehicle climbs to the roof for operation, and certain potential safety hazards exist.

3) The liquid level in the expansion tank is inconvenient to check. The expansion tank is placed on the roof, and when the liquid level in the tank is low, the liquid level cannot be checked and found in time, so that the cooling liquid of the system cannot be supplemented in time, and the pressure regulation effect of the expansion tank is reduced.

4) Easily cause the damage of roof spare part. The commercial vehicle roof is generally provided with more parts, the cooling liquid is filled in the roof, the space of feet is limited, most operations are carried out by stepping on other roof part shells, and the roof part shells are easy to damage.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a vehicle liquid circulation system and vehicle for solve the liquid circulation system filling inefficiency and the inconvenient problem of liquid level inspection in the expansion tank.

In order to achieve the above object, the utility model discloses a scheme includes:

the utility model discloses a vehicle liquid flow circulating system, which comprises an expansion water tank, a first water pump and a plurality of components positioned on a circulating pipeline, wherein at least one component is positioned higher than the expansion water tank in the system; the highest position of the circulating pipeline is connected with the expansion water tank through an air overflow pipe; the expansion water tank is also connected with the circulating pipeline through a liquid supplementing pipe, and the first water pump is arranged on the circulating pipeline at the downstream of the connection point of the liquid supplementing pipe and the circulating pipeline;

the inner cavity of the expansion water tank is provided with a liquid seal cabin communicated with the inner cavity of the expansion water tank, the liquid seal cabin is provided with a communication port connected with the expansion water tank, one end of the gas overflow pipe extends into the liquid seal cabin, and the pipe orifice is lower than the communication port.

The utility model provides a vehicle liquid flow circulation system, including expansion tank, water pump and the part that is located the cooling of treating or heating on the circulating line. The utility model discloses for the convenience of coolant liquid fluid infusion or fortune dimension, arrange expansion tank in the lower part of circulation system, return to expansion tank for the coolant liquid that prevents in the high-order pipeline under the action of gravity, the utility model discloses further set up the U-shaped pipeline at the gas overflow pipe, U type pipeline one end connected system high-order pipeline, the expansion line is connected to the other end, the minimum section of U type pipeline is less than expansion tank cooling liquid level minimum in height. Meanwhile, a liquid seal cabin communicated with the inner cavity of the expansion water tank is arranged in the inner cavity of the expansion water tank, the liquid seal cabin is communicated with the expansion water tank, the air overflow pipe extends into the liquid seal cabin, and the pipe orifice of the air overflow pipe is lower than the communication port of the liquid seal cabin communicated with the expansion water tank.

In the liquid flow circulation process, the overflow gas pipe, the expansion water tank and the liquid supplementing pipe are used as a parallel pipeline of a section of main pipeline, and the overflow gas liquid flow can be formed under the action of the water pump. The gas in the circulating system can form bubbles and flow into the expansion water tank from the gas overflow pipeline in a gas-liquid mixing mode from the highest position of the circulating system, the gas in the expansion water tank is reserved at the upper part of the expansion water tank, the liquid reenters the main pipeline from the liquid supplementing pipe to participate in circulation, and when the pressure difference between the circulating system and the outside is larger than a set value (the opening pressure of the pressure limiting gas overflow valve at the top of the expansion water tank), the gas at the upper part of the expansion water tank is discharged out of the circulating system. When the water pump stops, the pressure difference between the front and the back of the water pump disappears, if the liquid level position in the expansion water tank is lower than the air overflow pipe orifice of the expansion water tank at the moment, the cooling liquid in the system flows into the expansion water tank from the liquid supplementing pipe under the action of the pressure difference until the liquid level of the cooling liquid in the expansion water tank is higher than the air overflow pipe orifice, the pressure in the system is balanced, and the backflow stops. The backflow of the coolant may result in the liquid level in the expansion tank not accurately reflecting whether the system is short of coolant (because the liquid level in the expansion tank always reaches the orifice position of the air overflow pipe regardless of whether the coolant is short of coolant). And if the height of the overflow pipe opening of the expansion water tank is higher than that of the filling opening of the expansion water tank, the cooling liquid can be sprayed out from the filling opening after the pressure cover of the expansion water tank is opened, so that certain potential safety hazards exist.

The utility model arranges a liquid seal cabin at the position of the mouth of the gas overflow pipe in the expansion tank for storing a certain amount of cooling liquid to realize liquid seal of the gas overflow pipe, in the circulation process, the cooling liquid can firstly fill the liquid seal cabin when gas-liquid mixture enters the expansion tank from the gas overflow pipe, and then enters the expansion tank from the communication port of the liquid seal cabin and the expansion tank, when the water pump stops, if the liquid level position in the expansion tank is higher than the upper surface of the liquid seal cabin, the system is in a pressure balance state and can not flow back; if the liquid level in the expansion water tank is lower than the upper surface of the liquid seal cabin, the liquid level in the liquid seal cabin descends, the liquid level outside the liquid seal cabin ascends until the liquid level inside and outside the liquid seal cabin is level, the system reaches a pressure balance state, and the liquid level in the expansion water tank cannot change. Due to the existence of the liquid seal cabin, the full liquid state in the air overflow pipe can be ensured all the time, and the situation that air in the expansion water tank reversely enters the system from the air overflow pipe in the process of establishing pressure balance after the water pump stops is effectively avoided. The utility model discloses, effectively prevented that the coolant liquid from the most significant bit of system from flowing backwards, also prevented that gas from getting into circulation system from expansion tank again, guaranteed that the liquid level in the expansion tank really reflects the coolant liquid level in the system.

Further, the upper surface of the liquid seal cabin is opened to form the communication port.

Further, the gas overflow pipe extends into the liquid seal cabin from the communication opening, and the opening at the end part of the gas overflow pipe is lower than the lowest point of the side wall of the liquid seal cabin.

The upper surface of a liquid seal cabin arranged in the expansion water tank is opened to form a water tank, the water tank is communicated with the expansion water tank, and one end of an air overflow pipe extending into the expansion water tank extends into the water tank from an opening on the upper surface and is lower than the edge of the water tank. After the water pump is started, the overflow pipe fills the water tank all the time, and the effective liquid seal of the overflow pipe at any time is ensured.

Further, the liquid seal cabin is arranged on one side surface of the expansion water tank.

The liquid seal cabin is arranged on one side face of the expansion water tank, the liquid seal cabin can be fixed by the expansion water tank, and the liquid seal cabin does not need to be additionally fixed by a support or connected and fixed with the air overflow pipe, so that the liquid seal cabin is possibly fixed and unstable, or the air overflow pipe is damaged.

Furthermore, the air overflow pipe comprises a high-level pipeline connected with the highest position of the circulating pipeline, a U-shaped pipeline and an expansion pipeline connected with the expansion water tank; one end of the U-shaped pipeline is connected with the high-level pipeline, the other end of the U-shaped pipeline is connected with the expansion pipeline, and the lowest section of the U-shaped pipeline is lower than the lowest point of the cooling liquid level of the expansion water tank in height.

Considering the inclination or the damage of the liquid seal cabin, the cooling liquid in the liquid seal cabin is lost, the liquid level can be reduced, and the gas overflow pipe can not form effective liquid seal. The utility model discloses further utilized the principle of linker, changed the arrangement of excessive trachea to prevent that the coolant liquid among the high-order pipeline from backflowing and getting into expansion tank when the liquid seal cabin damages. The overflow pipe is arranged with a section of vertical pipeline from bottom to top before communicating the expansion water tank, and turns back at the lowest point to connect the highest point of the system, and connects the liquid replenishing pipe with the expansion water tank through the main pipeline from the highest point of the system to form a communicating vessel, the expansion water tank and the vertical pipeline form two ends of the communicating vessel, the liquid level in the two ends is stressed with the same pressure as the pressure in the expansion water tank, and the liquid level in the two ends is consistent according to the principle of the communicating vessel, thereby ensuring that the cooling liquid is prevented from flowing back when the liquid seal bin is damaged and the liquid seal fails. The utility model discloses utilize the linker principle to change the arrangement of excessive gas pipe in expansion tank department, guarantee that the coolant liquid can not flow back.

Further, the lowest section of the U-shaped pipeline is lower than the bottom surface of the expansion water tank in height.

The position is arranged to the lowest section of U type pipeline and is less than expansion tank's bottom surface, and vertical pipeline extends to expansion tank's bottom surface promptly, guarantees that the cooling liquid level can be less than expansion tank bottom surface in expansion tank when cooling liquid lacks in the system, has guaranteed that the cooling liquid is less than the effective warning when the lowest position.

Further, the transverse distance between the first water pump and the expansion water tank is smaller than a set value.

The transverse distance between the first water pump and the expansion water tank is smaller than a set value, so that the cooling liquid in the expansion water tank can smoothly flow into a circulating pipeline at the upstream of the first water pump under the suction action of the water pump and the action of gravity.

Further, the first water pump forms a first branch, and the first branch at least comprises one component; the water pump is characterized by further comprising a second branch, wherein the second branch comprises a second water pump and a component which are connected in sequence, and the second branch is connected with the first branch in parallel.

The utility model discloses still be applicable to the motorcycle type of two water pumps or many water pump branches, the part in other branches can be higher than expansion tank and arrange, also can be less than expansion tank and arrange.

the air overflow pipe comprises a high-level pipeline connected with the highest position of the circulating pipeline, a U-shaped pipeline and an expansion pipeline connected with the expansion water tank; one end of the U-shaped pipeline is connected with the high-level pipeline, the other end of the U-shaped pipeline is connected with the expansion pipeline, and the lowest section of the U-shaped pipeline is lower than the lowest point of the cooling liquid level of the expansion water tank in height.

The utility model provides a vehicle liquid flow circulation system, including expansion tank, water pump and the part that is located the waiting cooling or heating on the circulating line. The utility model discloses for the convenience of coolant liquid fluid infusion or fortune dimension, arrange expansion tank in circulation system's lower part, return to expansion tank through the fluid infusion pipeline for the coolant liquid that prevents in the high-order pipeline under the action of gravity, the utility model discloses further improve the gas overflow pipeline.

In the liquid flow circulation process, the overflow gas pipe, the expansion water tank and the liquid supplementing pipe are used as a parallel pipeline of a section of main pipeline, and the overflow gas liquid flow can be formed under the action of the water pump. The gas in the circulating system can form bubbles and flow into the expansion water tank from the gas overflow pipeline in a gas-liquid mixing mode from the highest position of the circulating system, the gas in the expansion water tank is reserved at the upper part of the expansion water tank, the liquid reenters the main pipeline from the liquid supplementing pipe to participate in circulation, and when the pressure difference between the circulating system and the outside is larger than a set value (the opening pressure of the pressure limiting gas overflow valve at the top of the expansion water tank), the gas at the upper part of the expansion water tank is discharged out of the circulating system. When the water pump stops, if the liquid level position in the expansion water tank is lower than the air overflow pipe orifice of the expansion water tank, the cooling liquid in the system flows into the expansion water tank from the liquid supplementing pipe under the action of pressure difference until the liquid level of the cooling liquid in the expansion water tank is higher than the air overflow pipe orifice, the pressure in the system is balanced, and the backflow stops. The backflow of the coolant may result in the liquid level in the expansion tank not accurately reflecting whether the system is short of coolant (because the liquid level in the expansion tank always reaches the orifice position of the air overflow pipe regardless of whether the coolant is short of coolant). And if the height of the overflow pipe opening of the expansion water tank is higher than that of the filling opening of the expansion water tank, the cooling liquid can be sprayed out from the filling opening after the pressure cover of the expansion water tank is opened, so that certain potential safety hazards exist.

The utility model discloses further utilized the principle of linker, changed excessive tracheal arrangement to prevent that the coolant liquid among the high-order pipeline from backflowing gets into expansion tank. The overflow pipe is arranged with a section of vertical pipeline from bottom to top before communicating the expansion water tank, and turns back at the lowest point to connect the highest point of the system, and connects the liquid replenishing pipe with the expansion water tank through the main pipeline from the highest point of the system to form a communicating vessel, the expansion water tank and the vertical pipeline form two ends of the communicating vessel, the liquid level in the two ends is stressed with the same pressure as the pressure in the expansion water tank, and the liquid level in the two ends is consistent according to the principle of the communicating vessel, thereby ensuring that the cooling liquid is prevented from flowing back when the liquid seal bin is damaged and the liquid seal fails. The utility model discloses utilize the communicating vessel principle to change the arrangement mode of excessive trachea in expansion tank department, guarantee that the coolant liquid can not flow back.

Furthermore, a liquid seal cabin communicated with the inner cavity of the expansion water tank is arranged in the inner cavity of the expansion water tank, a communication opening connected with the expansion water tank is formed in the liquid seal cabin, one end of the gas overflow pipe extends into the liquid seal cabin, and the pipe opening is lower than the communication opening.

In order to realize double insurance, the utility model discloses in expansion tank be located the position department of gas overflow pipe mouth of pipe and set up the liquid seal cabin and be used for storing a certain amount of coolant liquid in order to realize the liquid seal to the gas overflow pipe, in the circulation process, the coolant liquid can fill up the liquid seal cabin at first when gas-liquid mixture gets into expansion tank from the gas overflow pipe, get into expansion tank from liquid seal cabin and expansion tank intercommunication mouth again, when the water pump stops, if the liquid level position in the expansion tank is higher than the liquid seal cabin upper surface, the system is in pressure balance state promptly, can not flow back; if the liquid level in the expansion water tank is lower than the upper surface of the liquid seal cabin, the liquid level in the liquid seal cabin descends, the liquid level outside the liquid seal cabin ascends until the liquid level inside and outside the liquid seal cabin is level, the system reaches a pressure balance state, and the liquid level in the expansion water tank cannot change. Due to the existence of the liquid seal cabin, the full liquid state in the air overflow pipe can be ensured all the time, and the situation that air in the expansion water tank reversely enters the system from the air overflow pipe in the process of establishing pressure balance after the water pump stops is effectively avoided. The liquid seal cabin is arranged in the expansion water tank, so that the cooling liquid is effectively prevented from flowing back from the highest position of the system, gas is prevented from entering the circulating system from the expansion water tank, and the liquid in the expansion water tank truly reflects the level of the cooling liquid in the system.

The utility model discloses a vehicle, including foretell vehicle liquid circulation system.

Drawings

FIG. 1 is a schematic diagram of a single water pump low-level filling system;

FIG. 2 is a view showing a structure of a component assembly in which a plurality of components are connected in series;

FIG. 3 is a view showing a structure of a component assembly in which a plurality of components are connected in parallel;

FIG. 4 is a schematic diagram of a dual water pump low level fill system;

FIG. 5 is a structural diagram of the expansion tank of the present invention;

FIG. 6 is a connection mode of an overflow pipe of an expansion tank for preventing the backflow of cooling liquid;

fig. 7 is a schematic view of the liquid circulation system of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the system is as follows:

the utility model provides a vehicle liquid flow circulation low level filling system, as shown in figure 1 for single water pump low level filling system schematic diagram, each part is respectively in the figure: the system comprises an expansion water tank 1, a water pump 2, a cooled/heated component 7 arranged at a low position, a cooled/heated component 4 arranged at a high position, a liquid supplementing pipe 5 and an air overflow pipe 6. A main circulating water path is formed by the water pump 2, the pipeline, the cooled/heated component 7 arranged at a low position and the cooled/heated component 4 arranged at a high position; the expansion tank 1 is placed at a lower position of the system (the height of the expansion tank is lower than that of a cooled/heated part 4 arranged at a high position), and forms a filling and exhausting circulation water path together with an overflow pipe 6 and a liquid supplementing pipe 5. The cooled/heated component 7 arranged at the lower position and the cooled/heated component 4 arranged at the higher position can be 1 part, or can be a combination of parts formed by a plurality of parts in series or parallel relation, as shown in fig. 2 and 3.

In order to ensure the actual available capacity of the expansion water tank and reduce the internal flow rate of the expansion water tank, the expansion water tank 1 is connected in parallel in a pipeline in front of an inlet of a water pump through a liquid supplementing pipe 5; in order to realize the smooth discharge of the air accumulated at the high point of the system, an air overflow pipe 6 of the expansion water tank 1 is led out from the highest point of the system and connected with an air overflow interface of the expansion water tank 1; in order to ensure that the water pump 2 has a proper fluid infusion flow, the arrangement position of the expansion water tank 1 needs to be higher than that of the water pump 2, and the transverse distance between the water pump 2 and the expansion water tank 1 is as small as possible, so that the cooling fluid in the expansion water tank 1 can smoothly flow into an inlet of the water pump 2 under the action of gravity, and the smooth fluid infusion of the system is realized.

For a liquid flow circulating system with a plurality of parts, such as a pure electric bus battery thermal management system, a dual-motor driving system and the like, in order to ensure that each part obtains proper cooling flow, 2 water pumps are matched in the liquid flow circulating system, and a pipeline connection mode with the dual-water pumps connected in parallel is adopted. Fig. 4 is the schematic diagram of the low-level filling system of the dual-water-pump parallel structure of the present invention. The parts in the figure are respectively: the system comprises an expansion water tank 1, a water pump 2, a water pump 8, a high-level arranged cooled/heated part 4, a low-level arranged cooled/heated part 9, a low-level arranged cooled/heated part 7, a liquid supplementing pipe 5 and an air overflow pipe 6. The cooling/heating part 4, the cooling/heating part 9 and the cooling/heating part 7 arranged at the high position can be 1 part or a combination of a plurality of parts formed by series connection and parallel connection.

The water pump 2, the water pump 8, the high-level arranged cooled/heated part 4, the cooled/heated part 9, the low-level arranged cooled/heated part 7 and related pipelines form a main circulating water path, and the expansion water tank 1, the liquid supplementing pipe 5 and the air overflow pipe 6 form a filling and exhausting circulating water path. Wherein the cooling/heating part 4 arranged at a high position is positioned at a high position of the vehicle, the water pump 8 and the cooling/heating part 9 can be positioned at the high position of the vehicle and also can be positioned at a low position of the vehicle, and the water pump 2 and the cooling/heating part 7 arranged at a low position are positioned at the low position of the vehicle. In order to ensure that the vehicle can be smoothly filled in a non-vacuum state, the expansion water tank liquid supplementing pipe 5 needs to be connected in parallel near the water inlet of the water pump 2 arranged at a low position; in order to ensure that the water pump 2 has enough fluid infusion flow, the arrangement position of the expansion water tank 1 is higher than that of the water pump 2, and the transverse distance between the water pump 2 and the expansion water tank 1 is as small as possible; in order to realize the smooth discharge of the air accumulated at the high point of the system outside the liquid flow circulating system, the air overflow pipe 6 needs to be led out from the highest point of the system and connected with an air overflow interface of the expansion water tank 1.

In order to ensure the realization of the function of the low-level filling system, besides changing the configuration of the liquid flow circulating system, the structure and the installation mode of key parts in the system are correspondingly adjusted.

In order to ensure the efficiency of gas-liquid separation of the expansion water tank, an air overflow interface on the water tank needs to be arranged at the upper part of the water tank, and a guide pipe of the air overflow interface of the expansion water tank in the existing structure, which extends into the water tank, is usually short and is difficult to be covered by cooling liquid in the water tank to form an effective liquid seal. When the expansion water tank is placed at a low position, after the water pump stops working, cooling liquid in the system can flow back into the water tank from the liquid supplementing interface of the expansion water tank, the liquid level in the water tank can slowly rise until the liquid level is beyond the air overflow interface and extends into the conduit port in the water tank, the system stops backflow, and the liquid level stops rising. If the position of the water tank filling port is lower than the air overflow guide pipe port, after the pressure cover of the expansion water tank is opened, cooling liquid can continuously overflow from the water tank filling port, and the system function failure is caused.

The utility model discloses based on above problem, provided new expansion tank structure, as shown in FIG. 5, each part is respectively in the picture: the expansion water tank comprises an expansion water tank body 1, an air overflow pipe joint 61, a liquid seal bin 3 with an opening at the upper end and used for reducing the height of liquid seal in the water tank, an expansion water tank filling port 4, a liquid level sensor joint 10, a liquid supplementing pipe joint 5 and an expansion water tank sight glass 11. The utility model discloses the pipe length that expansion tank's overflow air pipe interface 6 stretches out in expansion tank has been prolonged to increase upper end open-ended liquid seal storehouse 3 around the inside overflow air pipe of water tank, with the liquid seal height that reduces expansion tank overflow air interface, when liquid level position was lower in the guarantee water tank, the overflow air interface also can form effective liquid seal.

In order to realize the normal liquid level alarm function of the expansion tank, the cooling liquid in the expansion tank needs to be ensured to be pumped out basically, and when the liquid level is lower than the alarm liquid level of the liquid level alarm of the water tank, the backflow of the cooling liquid still does not occur. The utility model provides a prevent whole car air overflow pipe tube coupling mode of cooling reflux. As shown in fig. 6, the parts in the figure are respectively: the expansion water tank 1, an expansion water tank air overflow pipe joint 61, a whole vehicle air overflow pipe 64, the lowest point 63 of the air overflow pipe near the expansion water tank, and the vertical upward section 62 of the air overflow pipe near the expansion water tank. Near expansion tank, overflow trachea pipeline minimum 63 that drops down from the vehicle peak need be less than expansion tank 1's lower surface, and at this moment, the vertical upper segment pipeline 62 of overflow trachea near expansion tank 1 can form the linker with expansion tank is inside, and after liquid circulation system water pump stopped working, the liquid level in the vertical upper segment pipeline 62 of overflow trachea can descend, and expansion tank 1 internal liquid level rises, and when the liquid level in the vertical upper segment pipeline 62 of overflow trachea and expansion tank 1 internal liquid level was at ordinary times, system pressure balance, the system stops to the inside refluence of expansion tank, and the liquid level in the expansion tank no longer continues to rise to realize the normal liquid level alarming function when the liquid level in the expansion tank is lower.

The utility model provides a low level filling system only influences vehicle liquid circulation system's filling process and exhaust process, to single water pump system low level filling configuration and two water pump parallel system low level filling configurations, its concrete realization form under filling operating mode and exhaust operating mode of difference concrete description.

The utility model discloses for the convenience of coolant liquid fluid infusion or fortune dimension, arrange expansion tank in the lower part of circulation system, in order to prevent that the coolant liquid in the high-order pipeline from flowing back to expansion tank under the action of gravity, the utility model discloses further set up the liquid seal cabin with expansion tank inner chamber intercommunication in the expansion tank inner chamber, liquid seal cabin and expansion tank intercommunication, the mouth of pipe that the gas overflow pipe stretched into liquid seal under-deck and gas overflow pipe is less than the intercommunication mouth of liquid seal cabin intercommunication expansion tank.

In the liquid flow circulation process, the overflow gas pipe, the expansion water tank and the liquid supplementing pipe are used as a parallel pipeline of a section of main pipeline, and the overflow gas liquid flow can be formed under the action of the water pump. The gas in the circulating system can form bubbles and flow into the expansion water tank from the gas overflow pipeline in a gas-liquid mixing mode from the highest position of the circulating system, the gas in the expansion water tank is reserved at the upper part of the expansion water tank, the liquid reenters the main pipeline from the liquid supplementing pipe to participate in circulation, and when the pressure difference between the circulating system and the outside is larger than a set value (the opening pressure of the pressure limiting gas overflow valve at the top of the expansion water tank), the gas at the upper part of the expansion water tank is discharged out of the circulating system. When the water pump stops, if the liquid level position in the expansion water tank is lower than the air overflow pipe orifice of the expansion water tank, the cooling liquid in the system flows into the expansion water tank from the liquid supplementing pipe under the action of pressure difference until the liquid level of the cooling liquid in the expansion water tank is higher than the air overflow pipe orifice, the pressure in the system is balanced, and the backflow stops. The liquid level height that can lead to in the expansion tank that the coolant liquid refluxes can lead to the inaccurate reaction system whether to lack the coolant liquid (because no matter whether lack the coolant liquid, the liquid level in the expansion tank always can reach gas overflow pipe mouth position), and if expansion tank gas overflow pipe mouth height is higher than expansion tank filler opening, the coolant liquid still can follow the filler opening blowout behind the opening expansion tank pressure lid, has certain potential safety hazard.

As shown in fig. 7, the utility model discloses in expansion tank be located the position department of gas overflow pipe connector 61 and set up the liquid seal cabin and be used for storing a certain amount of coolant liquid in order to realize the liquid seal to the gas overflow pipe, in the circulation process, the coolant liquid can fill up liquid seal storehouse 3 at first when gas-liquid mixture gets into expansion tank from the gas overflow pipe, get into expansion tank from liquid seal storehouse 3 and expansion tank 1 intercommunication mouth again, when the water pump stops, if the liquid level position is higher than liquid seal cabin upper surface in the expansion tank, the system is in pressure balance state promptly, can not flow backward; if the liquid level in the expansion water tank is lower than the upper surface of the liquid seal cabin, the liquid level in the liquid seal cabin descends, the liquid level outside the liquid seal cabin ascends until the liquid level inside and outside the liquid seal cabin is level, the system reaches a pressure balance state, and the liquid level in the expansion water tank cannot change. Due to the existence of the liquid seal cabin, the full liquid state in the air overflow pipe can be ensured all the time, and the situation that air in the expansion water tank reversely enters the system from the air overflow pipe in the process of establishing pressure balance after the water pump stops is effectively avoided. The liquid seal cabin is arranged in the expansion water tank, so that the cooling liquid is effectively prevented from flowing back from the highest position of the system, gas is prevented from entering the circulating system from the expansion water tank, and the liquid in the expansion water tank truly reflects the level of the cooling liquid in the system.

Considering that if the liquid sealed chamber 3 is inclined or damaged, the cooling liquid in the liquid sealed chamber 3 runs off, the liquid level will drop, and the air overflow pipe 6 cannot form an effective liquid seal. The utility model discloses further utilized the principle of linker, changed the arrangement of excessive trachea to prevent when the liquid seal cabin damages, the coolant liquid among the high-order pipeline backflows and gets into expansion tank 1. The overflow pipe 6 is arranged with a section of vertical upward pipeline 62 from bottom to top before communicating the expansion water tank, and turns back at the lowest point to be connected with the highest point of the system, and is connected with the liquid supplementing pipe 5 through the overflow pipe 64 of the whole vehicle from the highest point of the system and then connected with the expansion water tank 1 to form a communicating device, the expansion water tank 1 and the vertical upward pipeline 62 form two end parts of the communicating device, the pressure of the liquid level in the two end parts is consistent and is the same as the pressure in the expansion water tank 1, and the liquid level height in the two end parts is consistent according to the principle of the communicating device, thereby ensuring that the cooling liquid is prevented from flowing backwards when the liquid seal bin is damaged and the liquid seal fails. The utility model discloses utilize the communicating vessel principle to change the arrangement mode of excessive trachea in expansion tank department, guarantee that the coolant liquid can not flow back.

For a single water pump system:

during vacuum pumping and filling, as shown in fig. 1 and 5, the system is realized in the following specific form:

1) vacuumizing, inserting a filling gun of vacuum filling equipment into a filling port of the expansion water tank 1, wherein the filling gun port can generate vacuum degree far lower than atmospheric pressure, air in a liquid flow circulating system is sucked into the expansion water tank 1 along the gas rectifying and overflowing pipe 6 and the liquid supplementing pipe 5 under the action of pressure difference between the system and the filling gun port, and is pumped out of the system through the filling gun port, and at the moment, the vacuum degree is formed in the system.

2) And (3) performing constant-pressure filling, filling the cooling liquid into the expansion water tank 1 from a filling gun port at a constant filling pressure, flowing into the liquid flow circulating system along the liquid replenishing pipe 5, and stopping filling when the pressure in the system is detected to be the same as the set pressure of filling equipment.

3) And (4) performing back suction, namely sucking redundant cooling liquid from the expansion water tank 1 through a filling gun, so that the liquid level position in the expansion water tank 1 is positioned at the highest position of the scale mark of the visual mirror of the expansion water tank.

4) And (3) exhausting, covering the expansion water tank 1 with a pressure cover, starting the battery water pump 2, circulating residual air in the system along with cooling liquid, when the residual air circulates to a high-point air overflow pipe opening of the whole vehicle, enabling a gas-liquid mixture to flow into the expansion water tank 1 along an air overflow pipe 6 to complete gas-liquid separation, and discharging the separated gas out of the system through the pressure cover of the expansion water tank 1.

When the non-vacuum filling is performed, as shown in fig. 1 and 5, the system is implemented in the following specific form:

1) keeping the water pump 2 static, and adding cooling liquid from the filling opening of the expansion water tank 1 until the liquid level in the expansion water tank 1 is stable and does not change any more.

2) And (3) starting the water pump 2, circulating the gas in the system along with the cooling liquid under the extrusion and density difference effects of the cooling liquid, entering the expansion water tank 1 along the gas overflow pipe 6 and the liquid supplementing pipe 5, and escaping from the outside of the system from the filling opening of the expansion water tank 1. At the moment, along with the discharge of air in the liquid circulation system, the liquid level in the expansion water tank 1 rapidly drops, and cooling liquid needs to be supplemented into the system from a filling port of the expansion water tank 1 in time.

3) After gas in the system is basically discharged, residual gas is mixed in the cooling liquid in the form of small bubbles, at the moment, the water pump 2 needs to be kept running for a period of time, the small bubbles circulate to the position near the interface of the high-point gas overflow pipe 6 of the system along with the cooling liquid, then the small bubbles flow into the expansion water tank 1 along the gas overflow pipe 6 in the form of gas-liquid mixture, gas-liquid separation is completed in the expansion water tank 1, the gas escapes from the filling opening of the expansion water tank 1, and at the moment, the liquid level in the expansion water tank 1 slowly falls.

4) When the liquid level in the expansion water tank 1 does not drop any more, adding cooling liquid into the expansion water tank 1 through a filling port of the expansion water tank 1 to the highest position of the scale mark of the expansion water tank visual mirror 11, closing the water pump 2, covering a pressure cover of the expansion water tank 1, and ending the non-vacuum filling of the system.

For a dual water pump system:

during vacuum pumping and filling, as shown in fig. 4 and 5, the specific implementation form of the system is as follows:

4) Exhausting air, covering a filling port pressure cover of the expansion water tank 1, and enabling the water pump 2 and the water pump 8 in the system to alternately operate through adjustment of a control strategy of the whole vehicle, wherein the operation time of a single water pump is t (t is determined according to the structure of a liquid circulation system of the whole vehicle).

When the water pump 2 operates, the operation path of the cooling liquid in the system is as follows: the cooling liquid flows to the cooled/heated part 7 arranged at a low position through the water pump 2, flows to the cooled/heated part 4 arranged at a high position and the cooled/heated part 9 through the cooled/heated part 7 arranged at the low position simultaneously, flows to the water pump 2 directly after flowing through the cooled/heated part 4 arranged at the high position, and flows to the water pump 2 after flowing to a part of the cooling/heated part 9 through the water pump 8.

When the water pump 8 operates, the operation path of the cooling liquid in the system is as follows: the cooling liquid flows to the cooled/heated member 9 via the water pump 8, flows to the higher-level arranged cooled/heated member 4 and the lower-level arranged cooled/heated member 7 via the cooled/heated member 9 at the same time, flows directly back to the water pump 8 after flowing through the higher-level arranged cooled/heated member 4, and flows back to the water pump 2 after passing through the water pump 2 at a part of the cooling liquid flowing to the lower-level arranged cooled/heated member 7.

In the process that 2 water pumps alternately operate, residual gas in the system flows along with cooling liquid, when the residual gas flows through a highest-point gas overflow interface of the system, a gas-liquid mixture flows into the expansion water tank 1 along the gas overflow pipe 6, after gas-liquid separation is completed in the expansion water tank 1, the separated gas is discharged out of the system through a pressure cover of the expansion water tank 1.

During non-vacuum filling, as shown in fig. 4 and 5, the system is realized in the following specific form:

1) keeping the water pump 2 and the water pump 8 static, and adding cooling liquid from the filling opening of the expansion water tank 1 until the liquid level in the expansion water tank 1 is stable and does not change any more.

2) And starting the water pump 2 and the water pump 8, circulating the gas in the system along with the cooling liquid under the extrusion and density difference effects of the cooling liquid, entering the expansion water tank 1 along the gas overflow pipe 6 and the liquid supplementing pipe 5, and escaping from the outside of the system through the filling opening of the expansion water tank 1. At the moment, along with the discharge of air in the liquid circulation system, the liquid level in the expansion water tank 1 rapidly drops, and cooling liquid needs to be supplemented into the system from a filling port of the expansion water tank 1 in time.

3) After gas in the system is basically discharged, residual gas is mixed in the cooling liquid in a small bubble mode, at the moment, the alternate operation of the water pump 2 and the water pump 8 is realized through the adjustment of the strategy of the vehicle controller, and the operation time of a single water pump is t (t is determined according to the structure of a liquid circulation system of the vehicle).

When the water pump 8 operates, the operation path of the cooling liquid in the system is as follows: the cooling liquid flows to the cooled/heated member 9 through the water pump 8, flows to the higher-level arranged cooled/heated member 4 and the lower-level arranged cooled/heated member 7 through the cooled/heated member 9 at the same time, flows directly back to the water pump 3 after flowing through the higher-level arranged cooled/heated member 4, and flows back to the water pump 2 after passing through the water pump 2 at a part of the cooling liquid flowing to the lower-level arranged cooled/heated member 7.

After circulating to the vicinity of the connector of the gas overflow pipe 6 at the highest point of the system along with the cooling liquid, small bubbles flow into the expansion water tank 1 along the gas overflow pipe 6 in the form of gas-liquid mixture, gas-liquid separation is completed in the expansion water tank 1, gas escapes from the filling opening of the expansion water tank 1, and the liquid level in the expansion water tank 1 slowly falls at the moment.

4) When the liquid level in the expansion water tank 1 does not drop any more, the cooling liquid is added into the expansion water tank 1 through the filling port of the expansion water tank until the highest position of the scale mark of the expansion water tank visual mirror 11, the water pump 2 and the water pump 8 are closed, the pressure cover of the expansion water tank 1 is covered, and the non-vacuum filling of the system is finished.

The embodiment of the vehicle is as follows:

the present invention also provides a vehicle comprising the above-mentioned fluid circulation system, which has been clearly illustrated in the system embodiments and will not be described herein again.

Claims

1. A liquid circulation system of a vehicle comprises an expansion water tank, a first water pump and a plurality of components positioned on a circulation pipeline, and is characterized in that at least one component is positioned higher than the expansion water tank in the system; the highest position of the circulating pipeline is connected with the expansion water tank through an air overflow pipe; the expansion water tank is also connected with the circulating pipeline through a liquid supplementing pipe, and the first water pump is arranged on the circulating pipeline at the downstream of the connection point of the liquid supplementing pipe and the circulating pipeline;

2. The vehicular fluid circulation system of claim 1, wherein the upper surface of the hydraulic capsule is open to form the communication port.

3. The vehicle fluid circulation system of claim 2, wherein the air overflow pipe extends from the communication port into the liquid seal compartment, and an end opening of the air overflow pipe is lower than the lowest point of the side wall of the liquid seal compartment.

4. The vehicle fluid circulation system of claim 3, wherein the hydraulic capsule is disposed on one side of the expansion tank.

5. The vehicle fluid circulation system of claim 3, wherein the gas overflow pipe comprises a high-level pipe connecting the highest level of the circulation pipe, a U-shaped pipe, and an expansion pipe connecting the expansion tank; one end of the U-shaped pipeline is connected with the high-level pipeline, the other end of the U-shaped pipeline is connected with the expansion pipeline, and the lowest section of the U-shaped pipeline is lower than the lowest point of the cooling liquid level of the expansion water tank in height.

6. The vehicle fluid circulation system of claim 5, wherein the lowest section of the U-shaped conduit is lower in height than the floor of the expansion tank.

7. The vehicle fluid circulation system of claim 6, wherein the first water pump is laterally spaced from the expansion tank by less than a set value.

8. The vehicular fluid circulation system of claim 7, wherein the first water pump forms a first branch comprising at least one component; the water pump system is characterized by further comprising a plurality of second branches, wherein each second branch comprises a second water pump and a plurality of parts which are sequentially connected through pipelines, and the second branches are connected with the first branches and the second branches in parallel.

9. A vehicle liquid flow circulating system comprises an expansion water tank, a first water pump and a plurality of components positioned on a circulating pipeline, and is characterized in that at least one component is positioned higher than the expansion water tank in the system; the highest position of the circulating pipeline is connected with the expansion water tank through an air overflow pipe; the expansion water tank is also connected with the circulating pipeline through a liquid supplementing pipe, and the first water pump is arranged on the circulating pipeline at the downstream of the connection point of the liquid supplementing pipe and the circulating pipeline;

10. The vehicle fluid circulation system of claim 9, wherein the lowest section of the U-shaped conduit is lower in height than the floor of the expansion tank.

11. The vehicular liquid circulation system according to claim 9, wherein the expansion tank has a liquid seal chamber communicating with the expansion tank, the liquid seal chamber has a communication port connecting with the expansion tank, and one end of the gas overflow pipe extends into the liquid seal chamber and the pipe orifice is lower than the communication port.

12. The vehicular fluid circulation system of claim 11, wherein the upper surface of the hydraulic capsule is open to form the communication port.

13. The vehicle fluid circulation system of claim 12, wherein the air overflow pipe extends from the communication port into the liquid seal compartment, and an end opening of the air overflow pipe is lower than the lowest point of the side wall of the liquid seal compartment.

14. The vehicle fluid circulation system of claim 13, wherein the hydraulic capsule is disposed on one side of the expansion tank.

15. The vehicle fluid circulation system of claim 9, wherein the first water pump is laterally spaced from the expansion tank by less than a set value.

16. The vehicle fluid circulation system of claim 15, wherein the first water pump forms a first branch, the first branch comprises at least one component, and further comprises a plurality of second branches, the second branches comprise a second water pump and a plurality of components which are sequentially connected through a pipeline, and the second branches are connected in parallel with the first branch and the second branch.

17. A vehicle comprising a vehicle fluid circulation system according to any one of claims 1 to 16.