An expansion tank cap with high-precision pressure control

Abstract

The utility model discloses an expansion water tank cover with high-precision pressure control, comprising a water tank, a water inlet and a tank cover, wherein the upper end face of the water inlet is mounted on the upper end face of the water tank, the outer diameter surface of the water inlet is threadedly connected with the tank cover, the tank cover comprises a shell and a pressure relief mechanism, the inner cavity of the shell is provided with a pressure relief mechanism, the pressure relief shell forms a connecting structure with the groove of the tank cover through a grille net, and the contact surface of the pressure relief shell, the grille net and the groove of the tank cover is provided with a sealing assembly. The expansion water tank cover with high-precision pressure control detects the pressure in the water tank through the pressure relief mechanism in the inner cavity of the tank cover, wherein the tank cover is mainly used to prevent the cooling system from bursting due to excessive pressure, and the pressure relief mechanism is used to relieve the pressure of the water tank, while avoiding dust accumulation at the pressure relief port, avoiding affecting the pressure relief of the water tank, and avoiding high-temperature and high-pressure gas from affecting elastic parts and electronic components, thereby enabling the device to have the function of measuring the pressure in the inner cavity of the water tank with high precision.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion water tank covers, in particular to an expansion water tank cover with high-precision pressure control. Background Art

[0002] The expansion tank cap is an important part of the automobile cooling system. It is mainly used to prevent the adverse consequences of pipe burst caused by excessive pressure in the cooling system. In addition, the expansion tank cap also has a safety pressure relief function. It can automatically release the pressure when the coolant pressure is too high to prevent damage to the cooling system.

[0003] For example, application number CN202020419765.X discloses an expansion tank and an expansion tank cap, which not only reduces the evaporation of coolant from the expansion tank cap and reduces the maintenance cost of fuel cell vehicles, but also effectively reduces the pressure in the expansion tank; the above-mentioned device relieves the pressure of the vehicle cooling system by self-unloading, but the pressure relief port is normally open, and the pressure in the water tank cavity will shrink due to thermal expansion and contraction, and then exhalation and inhalation will be carried out through the pressure relief port, which may easily lead to dust accumulation at the pressure relief port for a long time, which is not conducive to the pressure relief work, and the gas released through the pressure relief port is high-temperature and high-pressure gas, which may easily cause deformation of the expansion tank cap. At the same time, the above-mentioned device does not have the function of high-precision pressure detection.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and an expansion tank cover with high-precision pressure control is proposed to achieve a more practical purpose. Utility Model Content

[0005] The utility model aims to provide an expansion tank cap with high-precision pressure control to solve the problems proposed in the above-mentioned background technology of avoiding dust accumulation at the pressure relief port of the expansion tank cap and preventing deformation of the expansion tank cap due to excessive temperature, while not having high-precision pressure detection.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an expansion tank cap with high-precision pressure control, comprising a water tank, a water inlet and a tank cap, the upper end surface of the water inlet is installed on the upper end surface of the water tank, and the outer diameter surface of the water inlet is threadedly connected to the tank cap, the tank cap is concave, the tank cap comprises a shell and a pressure relief mechanism, the inner cavity of the shell is provided with a pressure relief mechanism, and the pressure relief mechanism comprises a pressure relief shell and a first air outlet, the pressure relief shell is installed in the inner cavity of the shell, and the side wall of the pressure relief shell is provided with a first air outlet, a first air inlet is provided below the first air outlet, the first air outlet is connected to a second air outlet and a third air outlet through an air pipe, and the first air inlet is connected to a second air outlet and a third air outlet through an air pipe. The air pipe is connected to the second air inlet, and the first air outlet, the first air inlet, the second air outlet, the third air outlet and the second air inlet are all provided with dust covers on the side away from the inner cavity of the shell, the bottom end surface of the pressure relief shell is provided with a grid mesh, the inner cavity of the pressure relief shell is provided with a pressure detection mechanism, the pressure detection mechanism includes a pressure sensor and a reset spring, the pressure sensor is installed at the top of the inner cavity of the pressure relief shell, and the bottom end surface of the pressure sensor is provided with a reset spring, the side of the reset spring away from the pressure sensor is provided with a heat insulation board, the heat insulation board is composed of a slider, a ceramic column and a positioning plate, and the slider is connected to the positioning plate through the ceramic column, and a one-way valve is provided on one side of the second air inlet.

[0007] Furthermore, the outer diameter surface of the water inlet is provided with an external thread, the groove of the box cover is provided with an internal thread, and the box cover is threadedly connected with the external thread on the outer diameter surface of the water inlet through the internal thread.

[0008] Furthermore, the pressure relief shell forms a communication structure with the groove of the box cover through the grille net, and the contact surfaces of the pressure relief shell, the grille net and the groove of the box cover are provided with sealing components.

[0009] Furthermore, the first air outlet and the first air inlet are each provided with four groups, and the first air outlet and the first air inlet are evenly arranged with the center of the pressure relief shell as the origin, the second air outlet is provided with four groups, and the second air outlets are evenly arranged on the side wall of the box cover with the center of the box cover as the origin, and the first air outlet forms a connecting structure with the second air outlet through an air pipe, the third air outlet is provided with a group, and the third air outlet is installed on the upper end surface of the box cover, and the first air outlet forms a connecting structure with the third air outlet through the air pipe.

[0010] Furthermore, the inner diameter of the pressure relief shell is the same as the outer diameter of the heat insulation board, the inner cavity of the pressure relief shell and the heat insulation board form an up and down sliding structure, and the thickness of the heat insulation board is equal to the height of the first air outlet.

[0011] Furthermore, the sealing assembly is composed of a Y-shaped sealing ring, a Gly ring and a Step seal, and the Y-shaped sealing ring, the Gly ring and the Step seal are installed on the contact surfaces of the pressure relief shell, the grille net and the groove of the box cover, and the pressure relief shell forms a connecting structure with the groove of the box cover through the grille net and the sealing assembly.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the expansion tank cap with high-precision pressure control detects the pressure in the water tank through the pressure relief mechanism in the inner cavity of the tank cap, wherein the tank cap is mainly used to prevent the cooling system from being over-pressured and causing pipe bursting, and the pressure relief mechanism can be used to relieve the pressure of the water tank and detect the pressure in the water tank at the same time, and dust accumulation at the pressure relief port can be avoided to avoid affecting the pressure relief of the water tank, and high-temperature and high-pressure gas can be prevented from affecting the elastic parts and electronic components, thereby enabling the device to have the function of measuring the pressure in the inner cavity of the water tank with high precision;

[0013] In the expansion water tank cover with high-precision pressure control, the box cover is threadedly connected with the external thread on the outer diameter surface of the water inlet through the internal thread, so that the box cover is threadedly connected to the water tank, wherein the pressure relief shell forms a communication structure with the groove of the box cover through the grid net and the sealing component, and the water tank forms a communication structure with the pressure relief shell through the water inlet and the grid net, so that the pressure is transmitted to the inner cavity of the pressure relief shell. When the inner cavity of the water tank generates pressure, the pressure is transmitted to the pressure relief shell. At this time, the heat insulation board in the inner cavity of the pressure relief shell feels the pressure first, and the heat insulation board is composed of a slider, a ceramic column and a positioning plate for heat insulation and sliding. When the heat insulation board is subjected to pressure, the heat insulation board will move along the relief shell. The inner wall of the pressure shell moves upward, and the heat insulation plate transmits the pressure to the pressure sensor through the return spring, so as to measure the pressure generated in the inner cavity of the water tank, and the side wall of the pressure relief shell is provided with a first air outlet, and a first air inlet is provided below the first air outlet, wherein the initial position of the heat insulation plate blocks the first air outlet, and when the heat insulation plate moves upward, the heat insulation plate and the first air inlet are misaligned, so that the pressure is discharged through the first air inlet, and finally the pressure is discharged from the second air outlet and the third air outlet through the air pipe. Through the above structure, the device can detect the pressure in the inner cavity of the water tank while discharging the pressure, thereby preventing the cooling system from being over-pressured and causing a pipe burst;

[0014] When the expansion tank cover with high-precision pressure control inhales air due to thermal expansion and contraction, the heat insulation plate moves downward along the inner wall of the pressure relief shell, thereby restoring the heat insulation plate to its initial position and blocking the first air inlet at the same time. At this time, air is taken in through the first air inlet, and the first air inlet is connected to the second air inlet through an air pipe and a one-way valve, so that the gas from the outside can be sucked into the inner cavity of the water tank. A dust cover is installed on one side of the first air outlet, the first air inlet, the second air outlet, the third air outlet and the second air inlet to prevent dust from clogging the pressure relief port. At the same time, a sealing assembly is used to seal the contact surface between the pressure relief shell, the grille and the groove of the box cover, so that the pressure is transmitted to the pressure relief shell, thereby increasing the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the front view structure of an expansion tank cover with high-precision pressure control according to the utility model;

[0016] Figure 2 This is a schematic diagram of the front cross-section structure of an expansion tank cover with high-precision pressure control according to the utility model;

[0017] Figure 3 This is a schematic diagram of the front cross-section structure of a pressure relief shell of an expansion tank cover with high-precision pressure control according to the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of a pressure relief shell of an expansion tank cover with high-precision pressure control according to the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of an expansion tank cover heat insulation board with high-precision pressure control according to the utility model;

[0020] Figure 6 The utility model is a schematic structural diagram of an expansion tank cover sealing assembly with high-precision pressure control.

[0021] In the figure: 1. water tank; 2. water inlet; 3. tank cover; 301. shell; 302. pressure relief mechanism; 303. pressure relief shell; 304. first air outlet; 305. first air inlet; 306. second air outlet; 307. third air outlet; 308. second air inlet; 309. dust cover; 3010. grille; 3011. pressure detection mechanism; 3012. pressure sensor; 3013. reset spring; 3014. heat insulation board; 3015. slider; 3016. ceramic column; 3017. positioning plate; 3018. one-way valve; 4. sealing assembly; 401. Y-type sealing ring; 402. grid ring; 403. step seal. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figures 1 to 6 The utility model provides a technical solution: an expansion tank cap with high-precision pressure control, comprising a water tank 1, a water inlet 2 and a tank cap 3, wherein the upper end surface of the water inlet 2 is mounted on the upper end surface of the water tank 1, and the outer diameter surface of the water inlet 2 is threadedly connected with the tank cap 3, the tank cap 3 is concave, the tank cap 3 comprises a shell 301 and a pressure relief mechanism 302, the inner cavity of the shell 301 is provided with the pressure relief mechanism 302, and the pressure relief mechanism 302 comprises a pressure relief shell 303 and a first air outlet 304, the pressure relief shell 30 3 is installed in the inner cavity of the housing 301, and the side wall of the pressure relief housing 303 is provided with a first air outlet 304, and a first air inlet 305 is provided below the first air outlet 304. The first air outlet 304 is connected to the second air outlet 306 and the third air outlet 307 through an air pipe, and the first air inlet 305 is connected to the second air inlet 308 through an air pipe. The first air outlet 304, the first air inlet 305, the second air outlet 306, the third air outlet 307 and the second air inlet 308 are connected to each other. A dust cover 309 is provided on the side away from the inner cavity of the shell 301, a grid 3010 is provided on the bottom end surface of the pressure relief shell 303, a pressure detection mechanism 3011 is provided in the inner cavity of the pressure relief shell 303, and the pressure detection mechanism 3011 includes a pressure sensor 3012 and a reset spring 3013. The pressure sensor 3012 is installed at the top of the inner cavity of the pressure relief shell 303, and the bottom end surface of the pressure sensor 3012 is provided with a reset spring 3013, and the reset spring 3013 is away from the pressure sensor. A heat insulation board 3014 is provided on one side of the sensor 3012, and the heat insulation board 3014 is composed of a slider 3015, a ceramic column 3016 and a positioning plate 3017, and the slider 3015 is limitedly connected with the positioning plate 3017 through the ceramic column 3016, and a one-way valve 3018 is provided on one side of the second air inlet 308, and an external thread is provided on the outer diameter surface of the water inlet 2, and an internal thread is provided at the groove of the box cover 3, and the box cover 3 is threadedly connected with the external thread on the outer diameter surface of the water inlet 2 through the internal thread;

[0024] The box cover 3 is threadedly connected with the external thread on the outer diameter surface of the water inlet 2 through the internal thread, so that the box cover 3 is threadedly connected to the water tank 1. Since the pressure relief shell 303 uses the grille net 3010 and the sealing component 4 to form a connecting structure with the groove of the box cover 3, the water tank 1 uses the water inlet 2 and the grille net 3010 to form a connecting structure with the pressure relief shell 303, so that the pressure can be transmitted to the inner cavity of the pressure relief shell 303. When the inner cavity of the water tank 1 generates pressure, the pressure is transmitted to the pressure relief shell 303. At this time, the heat insulation board 3014 in the inner cavity of the pressure relief shell 303 first feels the pressure, and the heat insulation board 3014 is composed of a slider 3015, a ceramic column 3016 and a positioning plate 3017 for heat insulation and sliding. When the heat insulation board 3014 is subjected to pressure, the heat insulation board 3014 will move along the inner cavity of the pressure relief shell 303. The wall moves upward, and the heat insulation board 3014 transmits the pressure to the pressure sensor 3012 through the return spring 3013, so as to measure the pressure generated in the inner cavity of the water tank 1, and the side wall of the pressure relief shell 303 is provided with a first air outlet 304, and a first air inlet 305 is provided below the first air outlet 304, wherein the initial position of the heat insulation board 3014 blocks the first air outlet 304, and when the heat insulation board 3014 moves upward, the heat insulation board 3014 and the first air inlet 305 are misaligned, so that the pressure is discharged through the first air inlet 305, and finally the pressure is discharged from the second air outlet 306 and the third air outlet 307 through the air pipe. With the above structure, the device can detect the pressure in the inner cavity of the water tank 1 while discharging the pressure, thereby preventing the cooling system from being over-pressured and causing a pipe burst;

[0025] The pressure relief shell 303 forms a communication structure with the groove of the box cover 3 through the grille net 3010, and the contact surfaces of the pressure relief shell 303, the grille net 3010 and the groove of the box cover 3 are provided with a sealing component 4, the first air outlet 304 and the first air inlet 305 are provided with four groups, and the first air outlet 304 and the first air inlet 305 are evenly arranged with the center of the pressure relief shell 303 as the origin, the second air outlet 306 is provided with four groups, and the second air outlet 306 is evenly arranged on the side wall of the box cover 3 with the center of the box cover 3 as the origin, and the first air outlet 304 forms a communication structure with the second air outlet 306 through the air pipe, the third air outlet 307 is provided with a group, and the third air outlet 307 is installed on the upper end surface of the box cover 3, and the first air outlet 304 forms a communication structure with the third air outlet 307 through the air pipe;

[0026] When air is inhaled due to thermal expansion and contraction, the heat insulation board 3014 moves downward along the inner wall of the pressure relief shell 303, thereby restoring the heat insulation board 3014 to its initial position and blocking the first air inlet 305 at the same time. At this time, the first air inlet 305 is used for air intake, and the first air inlet 305 is connected to the second air inlet 308 via an air pipe and a one-way valve 3018, so as to inhale the gas from the outside into the inner cavity of the water tank 1. The dust cover 309 is installed on one side of the first air outlet 304, the first air inlet 305, the second air outlet 306, the third air outlet 307 and the second air inlet 308, so as to prevent dust from clogging the pressure relief port. At the same time, the sealing assembly 4 is used to seal the contact surface of the pressure relief shell 303, the grille 3010 and the groove of the box cover 3, so as to transmit the pressure to the pressure relief shell 303, thereby increasing the accuracy of the measurement.

[0027] The inner diameter of the pressure relief shell 303 is the same as the outer diameter of the insulation plate 3014, the inner cavity of the pressure relief shell 303 and the insulation plate 3014 form an up and down sliding structure, the thickness of the insulation plate 3014 is equal to the height of the first air outlet 304, the sealing assembly 4 includes a Y-shaped sealing ring 401, a grid ring 402 and a step seal 403, wherein the Y-shaped sealing ring 401 and the step seal 403 are each provided with two groups, and the two groups of step seals 403 are located between the two groups of Y-shaped sealing rings 401, wherein the grid ring 402 is provided between the two groups of step seals 403, and the Y-shaped sealing ring 401, the grid ring 402 and the step seal 403 are installed on the contact surface of the pressure relief shell 303, the grille net 3010 and the groove of the box cover 3, and the pressure relief shell 303 forms a connecting structure with the groove of the box cover 3 through the grille net 3010 and the sealing assembly 4.

[0028] Working principle: When using an expansion tank cover with high-precision pressure control, the cover 3 is firstly threadedly connected to the water tank 1. When pressure is generated in the inner cavity of the water tank 1, the pressure is transmitted to the pressure relief shell 303. At this time, the heat insulation board 3014 in the inner cavity of the pressure relief shell 303 first feels the pressure, and the heat insulation board 3014 is composed of a slider 3015, a ceramic column 3016 and a positioning plate 3017. When the heat insulation board 3014 is subjected to pressure, the heat insulation board 3014 will move upward along the inner wall of the pressure relief shell 303, and the heat insulation board 3014 transmits the pressure to the pressure sensor 3012 through the return spring 3013, so as to measure the pressure generated in the inner cavity of the water tank 1, and the side wall of the pressure relief shell 303 is provided with a first air outlet 304, and a first air outlet 304 is provided below the first air outlet 304. The air inlet 305, wherein the initial position of the heat insulation board 3014 blocks the first air outlet 304, when the heat insulation board 3014 moves upward, the heat insulation board 3014 and the first air inlet 305 are misaligned, thereby causing the pressure to be discharged through the first air inlet 305, and finally the pressure is discharged from the second air outlet 306 and the third air outlet 307 through the air pipe, when air intake occurs due to thermal expansion and contraction, the heat insulation board 3014 moves downward along the inner wall of the pressure relief shell 303, thereby restoring the heat insulation board 3014 to its initial position, and at the same time blocking the first air inlet 305, at this time, air is taken in through the first air inlet 305, and the first air inlet 305 is connected to the second air inlet 308 through the air pipe and the one-way valve 3018, so as to inhale the external gas into the inner cavity of the water tank 1.

Claims

1. An expansion tank cover with high-precision pressure control, comprising a water tank (1), a water inlet (2) and a tank cover (3), characterized in that: The upper end surface of the water inlet (2) is mounted on the upper end surface of the water tank (1), and a tank cover (3) is threadedly connected to the outer diameter surface of the water inlet (2), the tank cover (3) is concave, and the tank cover (3) comprises a shell (301) and a pressure relief mechanism (302). The inner cavity of the shell (301) is provided with a pressure relief mechanism (302), and the pressure relief mechanism (302) comprises a pressure relief shell (303) and a first air outlet (304). The pressure relief shell (303) is mounted in the inner cavity of the shell (301), and the pressure relief mechanism (302) comprises a pressure relief shell (303) and a first air outlet (304). The side wall of the shell (303) is provided with a first air outlet (304), a first air inlet (305) is provided below the first air outlet (304), the first air outlet (304) is connected to the second air outlet (306) and the third air outlet (307) via an air pipe, the first air inlet (305) is connected to the second air inlet (308) via an air pipe, and the first air outlet (304), the first air inlet (305), the second air outlet (306), and the third air outlet (307) are connected to each other. ) and a second air inlet (308) are both provided with a dust cover (309) on a side away from the inner cavity of the shell (301), the bottom end surface of the pressure relief shell (303) is provided with a grille (3010), the inner cavity of the pressure relief shell (303) is provided with a pressure detection mechanism (3011), the pressure detection mechanism (3011) comprises a pressure sensor (3012) and a return spring (3013), the pressure sensor (3012) is installed at the top end of the inner cavity of the pressure relief shell (303), and the pressure sensor (3012) is installed at the top end of the inner cavity of the pressure relief shell (303). A return spring (3013) is arranged on the bottom end surface of (3012); a heat insulation plate (3014) is arranged on the side of the return spring (3013) away from the pressure sensor (3012); the heat insulation plate (3014) is composed of a slider (3015), a ceramic column (3016) and a positioning plate (3017); the slider (3015) is connected to the positioning plate (3017) in a limiting manner through the ceramic column (3016); and a one-way valve (3018) is arranged on one side of the second air inlet (308).

2. The expansion tank cap with high-precision pressure control according to claim 1, characterized in that: The outer diameter surface of the water inlet (2) is provided with an external thread, the groove of the box cover (3) is provided with an internal thread, and the box cover (3) is threadedly connected with the external thread on the outer diameter surface of the water inlet (2) via the internal thread.

3. The expansion tank cap with high-precision pressure control according to claim 2, characterized in that: The pressure relief shell (303) forms a communication structure with the groove of the box cover (3) through the grille net (3010), and the contact surfaces of the pressure relief shell (303), the grille net (3010) and the groove of the box cover (3) are provided with a sealing component (4).

4. The expansion tank cap with high-precision pressure control according to claim 3, characterized in that: The first air outlet (304) and the first air inlet (305) are each provided with four groups, and the first air outlet (304) and the first air inlet (305) are both evenly arranged with the center of the pressure relief shell (303) as the origin; the second air outlet (306) is provided with four groups, and the second air outlet (306) is evenly arranged on the side wall of the box cover (3) with the center of the box cover (3) as the origin, and the first air outlet (304) forms a communication structure with the second air outlet (306) through an air pipe; the third air outlet (307) is provided with one group, and the third air outlet (307) is installed on the upper end surface of the box cover (3), and the first air outlet (304) forms a communication structure with the third air outlet (307) through the air pipe.

5. The expansion tank cap with high-precision pressure control according to claim 4, characterized in that: The inner diameter of the pressure relief shell (303) is the same as the outer diameter of the heat insulation plate (3014); the inner cavity of the pressure relief shell (303) and the heat insulation plate (3014) form an up-and-down sliding structure; the thickness of the heat insulation plate (3014) is equal to the height of the first air outlet (304).

6. The expansion tank cap with high-precision pressure control according to claim 5, characterized in that: The sealing assembly (4) is composed of a Y-shaped sealing ring (401), a grid ring (402) and a step seal (403), and the Y-shaped sealing ring (401), the grid ring (402) and the step seal (403) are installed on the contact surface of the pressure relief shell (303), the grille net (3010) and the groove of the box cover (3), and the pressure relief shell (303) forms a communication structure with the groove of the box cover (3) through the grille net (3010) and the sealing assembly (4).

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