A vehicle expansion tank

Abstract

The present application relates to a kind of vehicle expansion water tank, for closed tank structure, tank structure upper left, right two sides are equipped with 2 gas return interfaces respectively, tank structure lower part is equipped with 1 water supplement pipe, 2 gas return interfaces are connected high temperature system and low temperature system respectively;Tank structure top is equipped with pressure cover;Pressure cover inner middle part is equipped with valve core, spring is arranged in it, and convex structure is arranged on plastic part, for isolating the liquid returned by two gas return interfaces;Valve core outside is equipped with two sealing rings;When pressure cover is covered on tank structure, pressure cover will block two gas return interfaces completely, prevent coolant mixing.The vehicle expansion water tank of the present application adopts unique design structure, realizes when pressure cover is unscrewed, gas return pipe is unobstructed, after pressure cover is covered, gas return pipe is blocked;Unlike the structure of one sealing ring of general expansion water tank, two sealing rings are designed on pressure cover;Gas return pipe waterway is located in two sealing rings, and water flow is blocked after pressure cover is covered.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of expansion tanks, and particularly relates to a vehicle expansion tank. BACKGROUND

[0002] The expansion tank is mainly used for a cooling system, is connected to a cooling liquid circulation loop, and mainly functions to accommodate liquid that is expanded by heat and to supplement water and discharge air. In addition, the expansion tank is also provided with a pressure cover. If the pressure cover reaches a protection pressure, the pressure cover will be opened to release pressure, so that the system pressure will not exceed a limit value, and the cooling liquid is also filled through the expansion tank.

[0003] The expansion tank is also provided with a gas return port. When the system is running, the gas return port is used to discharge gas in the system to realize liquid-gas separation in the expansion tank. When the system is filled statically, the gas return port of the expansion tank can discharge gas in the system, so that the internal gas is not discharged and filling cannot be performed.

[0004] At present, many vehicle models have 2-4 cooling cycles on one vehicle. For example, if a water-cooled supercharger is used, a low-temperature cooling cycle is required, and a hybrid vehicle has a motor and a battery cooling cycle. Because the temperatures of each cycle are different, generally each cycle is independent of each other. However, in order to reduce the number of expansion tanks, one expansion tank is used for two systems. However, because of the temperature difference between the systems, the heat of the high-temperature system is transferred to the low-temperature system through the expansion tank in this way of sharing the expansion tank.

[0005] In this system, the expansion tank is provided with two gas return ports connected to the high-temperature system and the low-temperature system respectively, and one water supplement pipe connected to the two systems through a tee joint. In this way, the water of the high-temperature system and the low-temperature system is mixed in the expansion tank to realize heat transfer. Therefore, the traditional structure of the expansion tank has the problem of heat transfer when used for supplementing water for two systems. SUMMARY

[0006] The purpose of the present application is to provide a vehicle expansion tank to solve the problem of heat transfer of the traditional structure of the expansion tank when used for supplementing water for two systems.

[0007] The purpose of the present application is achieved by the following technical scheme:

[0008] A vehicle expansion tank is a closed tank structure, which is divided into an upper part and a lower part, and the upper part and the lower part are connected to form a whole, and the inside of the tank structure is completely communicated;

[0009] Two gas return ports are arranged on the left side and the right side of the upper part of the tank structure respectively, and one water supplement pipe is arranged on the lower part of the tank structure; the two gas return ports are connected to a high-temperature system and a low-temperature system respectively;

[0010] The tank body structure is provided with a pressure cover; a valve core is arranged in the middle of the pressure cover, a spring is arranged in the valve core, a convex structure is arranged on the plastic part and is used for isolating the liquid returned by the two gas return interfaces; two sealing rings are arranged outside the valve core; when the pressure cover is covered on the tank body structure, the pressure cover will block the two gas return interfaces completely to prevent the mixture of the cooling liquid.

[0011] Further, the whole tank body structure is a pure plastic part, which is divided into upper and lower parts according to the process requirement, and the upper and lower parts are formed by injection molding, and then are welded to form a complete tank body.

[0012] Further, the tank body structure is provided with a reinforcing rib inside.

[0013] Further, the tank body structure is provided with a spoiler structure inside.

[0014] Further, the gas return interface and the water supplement opening are made of PP material and are integrally injection molded with the tank body.

[0015] Further, the tank body structure is provided with an internal thread on the top, and the pressure cover is arranged on the internal thread, and the cover body of the pressure cover is connected with the thread on the top of the tank body structure.

[0016] Further, the valve core is fixedly connected with the pressure cover.

[0017] Further, the valve core is a hollow plastic part.

[0018] Further, when the pressure in the valve core is insufficient, the spring does not pop up, and when the pressure increases to a certain limit, the valve core is lifted up to communicate with the outside for pressure relief.

[0019] Further, the convex structure is made by injection molding.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] The vehicle expansion water tank adopts a unique design structure, realizes that the gas return pipe is unblocked when the pressure cover is screwed off, and the gas return pipe is blocked after the pressure cover is covered; unlike the structure of one sealing ring of a general expansion water tank, two sealing rings are designed on the pressure cover; the gas return pipe waterway is located in the two sealing rings to realize the water flow blocking after the pressure cover is covered. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 A schematic diagram of the internal structure of the pressure cover for the vehicle expansion tank of this invention;

[0024] Figure 2 A partial structural diagram of the vehicle expansion tank of the present invention when the pressure cap is not closed;

[0025] Figure 3 A schematic diagram of the overall structure of the vehicle expansion tank of this invention;

[0026] Figure 4 A schematic diagram of the structure of the vehicle expansion tank of the present invention when the pressure cap is not on.

[0027] Figure 5 Schematic diagram of pressure cap structure;

[0028] Figure 6 A schematic diagram of the split structure of the vehicle expansion tank of this invention. Detailed Implementation

[0029] The present invention will be further described below with reference to embodiments:

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] like Figures 1-2 As shown, the vehicle expansion tank of the present invention is a closed tank structure. The entire tank structure is made of pure plastic and is divided into upper and lower parts according to process requirements. The upper and lower parts are only for the convenience of injection molding and are not for functional considerations. After the upper and lower parts are injection molded, they are welded to form a complete tank.

[0033] The tank structure has two venting ports on the upper left and right sides, and a water supply pipe at the lower part. The two venting ports connect to the high-temperature system and the low-temperature system respectively. Coolant returning from the high-temperature and low-temperature systems mixes inside the tank and then flows out through the water supply pipe, causing heat to flow from the high-temperature system to the low-temperature system. The tank structure is completely internally connected and may include reinforcing ribs or flow-damping structures to reduce water flow velocity.

[0034] The return gas interface and the water supplement port are made of PP material and are integrally injection molded with the tank body.

[0035] The tank body structure is provided with an internal thread on the upper portion, and a pressure cover is mounted thereon, with the cover body outer thread being threadedly connected with the upper portion of the tank body structure.

[0036] The valve core is a hollow plastic part, and a spring is arranged in the valve core. When the pressure in the valve core is insufficient, the spring does not pop up. When the pressure increases to a certain limit, the valve core is lifted up to communicate with the outside for pressure relief. The plastic part is provided with a protruding structure formed by injection molding, which is used to isolate the liquid returned by the two return gas interfaces. Two sealing rings are arranged outside the valve core. When the pressure cover is covered on the tank body structure, the two return gas interfaces are completely blocked by the pressure cover to prevent the mixing of the cooling liquid.

[0037] Generally, such an expansion tank is used in a system with a relatively low temperature, and is not used in an engine cooling system with a temperature higher than 100℃. In a system with a relatively high temperature, gas is easily generated during operation. Blocking the return gas interface will cause gas to be stored in the system. In a low-temperature system, basically no gas is generated during operation. Therefore, the function of the return gas interface is basically to exhaust during filling. During filling, the pressure cover is unscrewed, and the exhaust pipe is unblocked. The cooling liquid returned by the return gas pipe is trapped in the two sealing rings, and the protruding structure is arranged on the valve core of the pressure cover to prevent the cooling liquid on both sides from contacting each other. In this way, the water inlet of the expansion tank is blocked, and the water in the expansion tank does not flow. Even if the water supplement pipe connects the two systems, the heat exchange between the two systems is very small due to the static heat transfer of the cooling liquid. By using this expansion tank, the heat exchange between the two systems can be significantly reduced, thereby providing a convenient condition for sharing the expansion tank by one or two systems.

[0038] In addition, because the temperature of an electric vehicle is relatively low, basically no gas is generated during operation of the vehicle, and the return gas port does not need to be communicated. Therefore, the invention has no effect on the system after the cover is blocked, and the function of the return gas port is only to exhaust during filling. For the expansion tank used in a traditional fuel vehicle, the system has a relatively high temperature, and gas is generated during operation. Therefore, the return gas port needs to be continuously communicated with the system, and this type of expansion tank cannot be used.

[0039] Embodiment 1

[0040] An expansion tank for a vehicle is a closed tank structure, which is divided into an upper portion and a lower portion. After the upper portion and the lower portion are injection molded, they are welded to form a complete expansion tank.

[0041] Two return gas interfaces are arranged on the upper left and right sides of the upper portion of the tank body structure, and one water supplement pipe is arranged on the lower portion of the tank body structure. The inside of the tank body structure is completely communicated, and a reinforcing rib can be arranged inside.

[0042] The two return gas interfaces are connected with the high-temperature system and the low-temperature system respectively, the cooling liquid returned by the high-temperature system and the low-temperature system is mixed in the tank, and then flows out from the water supplement pipe, which causes the heat of the high-temperature system to flow to the low-temperature system.

[0043] The tank body is provided with an internal thread on the upper structure, a pressure cover is threadedly connected on the internal thread, and a valve core is clamped in the middle of the pressure cover. The valve core is a hollow plastic part, a spring is arranged in the valve core, the spring does not pop up when the pressure in the valve core is insufficient, and the valve core is lifted when the pressure increases to a certain limit to communicate with the outside for pressure relief. A convex structure is injection molded on the plastic part for isolating the liquid returned by the two return gas interfaces. Two sealing rings are arranged outside the valve core.

[0044] The two sealing rings are arranged in the pressure cover, the return gas port is arranged in the two sealing rings, the cooling liquid flowing through the return gas port cannot flow to the lower part of the system, and cannot overflow from the outside, so that the water in the return gas pipe does not flow when the pressure cover is covered, and the function of avoiding mixed liquid is realized.

[0045] It should be noted that the above are only the preferred embodiments of the present application and the applied technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An automotive expansion tank, characterized by: The closed tank structure is divided into upper and lower parts, and the upper and lower parts are connected into a whole, and the tank structure is completely communicated inside; Two gas return interfaces are arranged on the left and right sides of the upper part of the tank structure, and one water supplement pipe is arranged on the lower part of the tank structure; the two gas return interfaces are connected with a high-temperature system and a low-temperature system respectively; A pressure cover is arranged above the tank structure; a valve core is arranged in the middle of the pressure cover, a spring is arranged in the valve core, a convex structure is arranged on a plastic part, and the convex structure is used for isolating liquid returned by the two gas return interfaces; two sealing rings are arranged outside the valve core; when the pressure cover is covered on the tank structure, the pressure cover will block the two gas return interfaces completely, so that the mixture of cooling liquid is prevented.

2. The expansion tank for a vehicle according to claim 1, characterized by: The tank structure is a pure plastic part, and is divided into upper and lower parts according to process requirements; after the upper and lower parts are injection molded, the upper and lower parts are welded to form a complete tank.

3. The expansion tank according to claim 1, characterized in that: The tank structure is internally provided with a reinforcing rib.

4. The expansion tank according to claim 1, characterized in that: The tank structure is internally provided with a turbulence structure.

5. The expansion tank of claim 1, wherein: The gas return interfaces and the water supplement openings are integrally injection molded with the tank structure by using PP material.

6. The expansion tank of claim 1, wherein: An inner thread is arranged on the upper part of the tank structure, and a pressure cover is arranged on the upper part of the tank structure; the outer thread of the cover body of the pressure cover is connected with the thread on the upper part of the tank structure.

7. The expansion tank of claim 1, wherein: The valve core is clamped and fixed with the pressure cover.

8. The expansion tank of claim 1, wherein: The valve core is a hollow plastic part.

9. The expansion tank of claim 1, wherein: When the pressure in the valve core is insufficient, the spring does not pop up; when the pressure increases to a certain limit, the valve core is lifted up and communicated with the outside, so as to be used for pressure relief.

10. The expansion tank of claim 1, wherein: The convex structure is made by injection molding.

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