Pressure cover of expansion water tank of fuel cell

Abstract

The utility model relates to the technical field of fuel cells, and discloses a pressure cover of a fuel cell expansion water tank, which comprises a pressure cover shell and a pressure regulating assembly, the valve body is switched between the pressure relief state and the pressure supplementing state, so that when the pressure of the expansion water tank is larger than the pressure relief pressure, the valve body and the partition plate are separated and combined, and gas is exhausted from a gap between the valve body and the inner wall of the outer cavity; when the pressure of the expansion water tank is small and needs to be supplemented, gas enters the inner cavity from the second channel of the valve body and then enters the expansion water tank, so that pressure relief and pressure supplementation are achieved; except common pressure relief and vacuum pressure supplement effects, the position of the pressure regulating rod is regulated to change the position of the sealing plate in the outer cavity, so that the pre-compression stroke of the spring which is propped between the sealing plate and the valve body is changed, the pressure required by elastic deformation of the spring is changed, the pressure relief pressure of the pressure cover is adjustable, and the pressure relief effect of the pressure cover is improved. Different fuel cell system application scenes are adapted, and the applicability of the fuel cell expansion water tank pressure cover is improved; the structure is simple and the use is easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field especially relates to a kind of fuel cell expansion water tank pressure cover. BACKGROUND

[0002] Hydrogen fuel cell needs to ensure that the entire system is in reasonable operating temperature under various operating conditions when running, and the closed cooling system composed of expansion water tank is the basis for ensuring normal working temperature.The key role in expansion water tank is expansion water tank pressure cover, through the relief valve spring inside expansion water tank pressure cover, when the internal pressure of expansion water tank is too large, the sealing cover is lifted under pressure, and the expansion water tank is relieved to the outside, so that the pressure inside the expansion water tank is in normal state.

[0003] But the pre-compression stroke and elastic coefficient of the relief valve spring of the current pressure cover are fixed values, which leads to that one pressure cover cannot adapt to different fuel cell system application scenarios.For example, too large relief pressure can lead to too large static pressure at the inlet of water pump, and difficulty in exhausting the cooling system, while too small relief pressure can lead to that the cooling system cannot establish closed seal, and the cooling liquid boils early, leading to failure of the cooling system.

[0004] To make the relief pressure of fuel cell expansion water tank pressure cover adjustable, the existing technology uses electric control system for control, mainly through sensor monitoring the pressure in water tank to control the volume of a gas bag inside the water tank to achieve the purpose of controlling pressure, and the overall system involves electric, pump body and other components, and the overall complexity is high, which is not conducive to later maintenance. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of fuel cell expansion water tank pressure cover, to solve the problems of fixed pressure type water tank cover relief pressure in prior art being unadjustable and electric control type expansion water tank pressure control assembly being too high in complexity.

[0006] To achieve the above-mentioned purpose, the utility model provides a kind of fuel cell expansion water tank pressure cover, which includes pressure cover shell and pressure regulating assembly.

[0007] The pressure cover shell includes shell and partition plate, the shell is hollow with two ends open, the partition plate is fixedly connected to the inner wall of the shell, and divides the internal space of the shell into outer cavity and inner cavity from top to bottom, and the side wall of the outer cavity is open;The first channel is formed in the partition plate, which communicates the outer cavity and the inner cavity.

[0008] The pressure regulating assembly includes pressure regulating rod, sealing plate, spring and vacuum valve.

[0009] The vacuum valve comprises a valve body which is hollow and open at both top and bottom ends, is arranged in the outer cavity and is sealingly connected to the top surface of the partition plate to cover the first channel; the valve body is provided with a second channel for connecting the outer cavity and the inner cavity;

[0010] The pressure regulating rod is vertically arranged and movably arranged in the outer cavity from top to bottom, the sealing plate is fixedly connected to the outer peripheral wall of the pressure regulating rod, and the outer edge of the sealing plate is sealingly connected to the inner wall of the outer cavity; the sealing plate is elastic;

[0011] The upper end of the shell is provided with an internal thread, the pressure regulating rod is screwed with the shell, and the spring is vertically arranged and abuts against the sealing plate and the valve body at both ends;

[0012] The valve body can be switched between pressure relief and pressure compensation states; when the valve body is in the pressure relief state, the valve body is disconnected from the partition plate, so that the inner cavity is communicated with the outer cavity, and the second channel is closed; when the valve body is in the pressure compensation state, the valve body is connected to the partition plate, the second channel is opened, and the inner cavity and the outer cavity are communicated through the second channel.

[0013] Further, the vacuum valve further comprises a valve column;

[0014] The top of the valve body is provided with a plurality of first air inlet holes penetrating the inner and outer surfaces thereof;

[0015] The valve column is movably connected to the inner wall of the valve body and divides the internal space of the valve body into a first chamber and a second chamber from top to bottom;

[0016] The valve column is provided with a second air inlet hole penetrating the upper and lower surfaces thereof, and the second channel is defined by the first air inlet hole, the first chamber, the second air inlet hole and the second chamber in sequence;

[0017] The bottom of the pressure regulating rod is arranged in the first chamber through the top opening of the valve body and is connected to the valve column in a disconnectable manner;

[0018] When the valve body is in the pressure relief state, the valve body is disconnected from the partition plate, so that the inner cavity is communicated with the outer cavity, and the valve column is moved upward to be connected to the pressure regulating rod to close the second air inlet hole; when the valve body is in the pressure compensation state, the valve body is connected to the partition plate, and the valve column is moved downward to be disconnected from the pressure regulating rod to open the second air inlet hole.

[0019] Further, the valve body comprises a body and an extension body which is arranged upwardly and extends, and the body and the extension body are both hollow and open at both top and bottom ends;

[0020] The lower end opening of the extension body is connected with the upper end opening of the body;

[0021] The spring is sleeved on the outer periphery of the extension body, and the two ends of the spring are respectively abutted with the sealing plate and the body;

[0022] The valve column is connected to the inner wall of the body and movably penetrates the internal space of the extension body;

[0023] The outer periphery of the valve column and the inner wall of the extension body jointly enclose the first chamber, and the outer periphery of the valve column and the inner wall of the body jointly enclose the second chamber.

[0024] Further, the vacuum valve further comprises a connecting plate, and the connecting plate is elastic;

[0025] The connecting plate is annularly arranged on the outer peripheral wall of the valve column, and the outer edge of the connecting plate is connected with the inner wall of the body.

[0026] Further, the sealing plate comprises a first extension part, a second extension part and a connecting part;

[0027] The second extension part is arranged below the first extension part, the first extension part is fixedly connected to the outer peripheral wall of the pressure regulating rod, and the outer edge of the second extension part is sealingly connected with the inner wall of the outer cavity;

[0028] The first extension part and the second extension part are fixedly connected through the connecting part;

[0029] The two ends of the spring are respectively abutted with the first extension part and the valve body;

[0030] The second extension part is elastic.

[0031] Further, the side wall of the outer cavity is provided with an annular flange;

[0032] The bottom surface of the outer edge of the second extension part is sealingly connected with the top surface of the flange.

[0033] Further, the top of the pressure regulating rod is provided with a handle;

[0034] The handle is provided with a plurality of scale marks, the top of the shell is provided with a standard scale line, the plurality of scale marks are arranged at intervals and are respectively arranged to extend outward along the radial direction of the pressure regulating rod, and the plurality of scale marks are used to correspond to different pressure relief pressures.

[0035] Further, the pressure cover shell further comprises a locking nut, the locking nut is arranged above the top opening of the shell and is sleeved on the outer periphery of the pressure regulating rod;

[0036] The pressure regulating rod is screwed with the locking nut.

[0037] Further, the pressure cover shell further comprises an exhaust pipe, one end of the exhaust pipe is connected with the side wall opening of the outer cavity.

[0038] Compared with the prior art, the fuel cell expansion tank pressure cover has the advantages that:

[0039] The fuel cell expansion tank pressure cover comprises a pressure cover shell and a pressure regulating assembly; the shell body is connected with the air chamber of the expansion tank through the lower end opening; the valve body of the vacuum valve can be switched between the pressure relief state and the pressure compensation state; when the air pressure in the air chamber of the expansion tank is relatively large, the valve body is subjected to an upward lifting force; when the force is greater than the pressure required for the spring to be elastically deformed, the valve body is in the pressure relief state, the spring is compressed, the valve body is lifted, the valve body is disengaged from the partition plate, the inner cavity is communicated with the outer cavity, and the second channel is closed; the high-pressure gas in the expansion tank is discharged into the outer cavity through the gap between the outer wall of the valve body and the inner wall of the outer cavity, and then discharged to the outside from the side wall opening of the outer cavity. When the air pressure in the air chamber of the expansion tank is relatively small and less than the atmospheric pressure, the valve body is in the pressure compensation state, the valve body is connected with the partition plate, the second channel is opened, and the gas is sucked into the outer cavity under the action of the pressure difference, and then enters the inner cavity through the second channel and finally reaches the air chamber of the expansion tank, so as to realize pressure compensation; in addition to the general pressure relief and vacuum pressure compensation, the position of the pressure regulating rod is adjusted, the spring abutting between the sealing plate and the valve body is changed, the pre-compression stroke of the spring is changed, the pressure required for the spring to be elastically deformed is changed, that is, the pressure at which the pressure relief occurs is changed, and then the pressure relief pressure of the pressure cover is adjusted, so as to adapt to different fuel cell system application scenarios and improve the applicability of the fuel cell expansion tank pressure cover; and the structure is simple and easy to adjust. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a sectional structure schematic view of the fuel cell expansion tank pressure cover of the utility model embodiment;

[0041] Figure 2 is Figure 1 an enlarged schematic view of the A area in figure 6;

[0042] Figure 3 is a sectional structure schematic view of the valve body in the fuel cell expansion tank pressure cover of the utility model embodiment;

[0043] Figure 4 is a sectional structure schematic view of the pressure regulating rod and the sealing plate in the fuel cell expansion tank pressure cover of the utility model embodiment;

[0044] Figure 5 is Figure 1 is an enlarged schematic view of the B region in the figure.

[0045] In the figure, 100, fuel cell expansion water tank pressure cover; 1, pressure cover shell; 2, pressure regulating assembly; 11, shell; 111, outer cavity; 1111, flange; 112, inner cavity; 12, partition plate; 13, locking nut; 14, exhaust pipe; 120, first channel; 21, pressure regulating rod; 211, handle; 22, sealing plate; 221, first extension; 222, second extension; 223, connecting part; 23, spring; 24, vacuum valve; 241, valve body; 2410, second channel; 2411, first air inlet hole; 2412, first chamber; 2413, second chamber; 2414, body; 2415, extension body; 242, valve stem; 2420, second air inlet hole; 243, connecting plate. DETAILED DESCRIPTION

[0046] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0047] As Figures 1-5 shown in the figure, the utility model embodiment of a fuel cell expansion water tank pressure cover 100, it includes pressure cover shell 1 and pressure regulating assembly 2;

[0048] The pressure cover shell 1 includes shell 11 and partition plate 12, the shell 11 is the hollow shape of the upper and lower two ends opening, the partition plate 12 is fixedly connected to the inner wall of shell 11, and the inside space of shell 11 is divided into outer cavity 111 and inner cavity 112 from top to bottom, the lateral wall of outer cavity is open;The first channel 120 that the outer cavity 111 and inner cavity 112 are communicated is set up on the partition plate 12;

[0049] The pressure regulating assembly 2 comprises a pressure regulating rod 21, a sealing plate 22, a spring 23 and a vacuum valve 24; the vacuum valve 24 comprises a valve body 241 which is hollow with both upper and lower ends open, is arranged in the outer cavity 111 and is sealingly and detachably attached to the top surface of the partition plate 12 to cover the first passage 120; the valve body 241 is provided with a second passage 2410 for connecting the outer cavity 111 and the inner cavity 112; the pressure regulating rod 21 is vertically arranged and movably penetrates the outer cavity 111 from top to bottom, the sealing plate 22 is fixedly connected to the outer peripheral wall of the pressure regulating rod 21, and the outer edge of the sealing plate 22 is sealingly connected to the inner wall of the outer cavity 111; the sealing plate 22 is elastic; the upper end of the shell 11 is provided with an internal thread, and the pressure regulating rod 21 is screwed with the shell 11; the spring 23 is vertically arranged and abuts against the sealing plate 22 and the valve body 241 at both ends respectively.

[0050] The valve body 241 can be switched between pressure relief and pressure compensation states; when the valve body 241 is in the pressure relief state, the valve body 241 is in engagement with or disengagement from the partition plate 12, so that the inner cavity 112 is communicated with the outer cavity 111, and the second passage 2410 is closed; when the valve body 241 is in the pressure compensation state, the valve body 241 abuts against the partition plate 12, the second passage 2410 is open, and the inner cavity 112 and the outer cavity 111 are communicated through the second passage 2410.

[0051] Based on the above technical scheme, the inner cavity 112 in the shell 11 is used for direct communication with the air chamber of the expansion water tank, and the inner cavity 112 is in communication with the outside atmosphere through the outer cavity 111; the spring 23 is vertically arranged, and the two ends thereof are respectively in abutment with the sealing plate 22 and the valve body 241, so that the valve body 241 is kept in abutment with the partition plate 12; when the air pressure in the air chamber of the expansion water tank is relatively large, the valve body 241 is subjected to an upward lifting force, and when the force is greater than the pressure required for the spring 23 to be elastically deformed, the spring 23 is compressed, the valve body 241 is in a pressure relief state, the valve body 241 is lifted and disengaged from the partition plate 12, so that the inner cavity 112 is communicated with the outer cavity 111, and the second channel 2410 is closed, the high-pressure gas in the expansion water tank is discharged to the outer cavity 111 through the gap between the outer wall of the valve body 241 and the inner wall of the outer cavity 111, and then discharged to the outside from the side wall opening of the outer cavity 111, so as to realize pressure relief. When the air pressure in the air chamber of the expansion water tank is relatively small and less than the outside atmospheric pressure, the valve body 241 is in a pressure compensation state, the valve body 241 is in abutment with the partition plate 12, the second channel 2410 is opened, and the gas is sucked into the outer cavity 111 under the action of the pressure difference, and then enters the inner cavity 112 through the second channel 2410 and finally reaches the air chamber of the expansion water tank, so as to realize pressure compensation. In addition to the general pressure relief and vacuum pressure compensation, by adjusting the position of the pressure regulating rod 21, the position of the sealing plate 22 in the outer cavity 111 is changed, the pre-compression stroke of the spring 23 abutting between the sealing plate 22 and the valve body 241 is changed, the pressure required for the spring 23 to be elastically deformed is changed, and then the adjustable pressure relief pressure of the pressure cover is realized, so as to adapt to different fuel cell system application scenarios and improve the applicability of the fuel cell expansion water tank pressure cover.

[0052] Further, as shown in Figures 1-3 The vacuum valve 24 further comprises a valve column 242; the top of the valve body 241 is provided with a plurality of first air inlet holes 2411 penetrating the inner and outer surfaces thereof; the valve column 242 is movably connected to the inner wall of the valve body 241 and divides the internal space of the valve body 241 into a first chamber 2412 and a second chamber 2413 from top to bottom; the valve column 242 is provided with a second air inlet hole 2420 penetrating the upper and lower surfaces thereof, and the second channel 2410 is jointly defined by the first air inlet hole 2411, the first chamber 2412, the second air inlet hole 2420 and the second chamber 2413 in sequence;

[0053] The bottom of the pressure regulating rod 21 is arranged in the first chamber 2412 through the top opening of the valve body 241, and is in releasable connection with the valve column 242; when the valve body 241 is in pressure relief state, the valve body 241 is in releasable connection with the partition plate 12, so that the inner cavity 112 is in communication with the outer cavity 111, and the valve column 242 is in connection with the pressure regulating rod 21 to close the second air inlet hole 2420; when the valve body 241 is in pressure compensation state, the valve body 241 is in connection with the partition plate 12, and the valve column 242 is in disconnection with the pressure regulating rod 21 to open the second air inlet hole 2420. The second channel 2410 is formed by the first air inlet hole 2411, the first chamber 2412, the second air inlet hole 2420 and the second chamber 2413 in sequence, so that the gas can enter the inner cavity 112 from the outer cavity 111 or vice versa through the first air inlet hole 2411, the first chamber 2412, the second air inlet hole 2420 and the second chamber 2413 in sequence; the second channel 2410 is closed by the valve column 242 in connection with the pressure regulating rod 21 to close the second air inlet hole 2420; the second channel 2410 is opened by the valve column 242 in disconnection with the pressure regulating rod 21 to open the second air inlet hole 2420.

[0054] Further, as shown in Figures 1-3 The valve body 241 comprises a body 2414 and an extension body 2415 extending upward, both of which are hollow with upper and lower openings; the lower opening of the extension body 2415 is in connection with the upper opening of the body 2414; the spring 23 is sleeved on the outer periphery of the extension body 2415, and the two ends thereof are in abutment with the sealing plate 22 and the body 2414 respectively; the valve column 242 is connected to the inner wall of the body 2414 and movably arranged in the inner space of the extension body 2415; the outer periphery of the valve column 242 and the inner wall of the extension body 2415 jointly form the first chamber 2412, and the outer periphery of the valve column 242 and the inner wall of the body 2414 jointly form the second chamber 2413. The valve body 241 is arranged as the body 2414 and the extension body 2415, on the one hand, the spring 23 is sleeved on the outer periphery of the extension body 2415, and the two ends thereof are in abutment with the sealing plate 22 and the body 2414 respectively, so as to improve the stability of the compression and reset movement of the spring 23 during pressure relief and compensation; on the other hand, the valve column 242 is connected to the inner wall of the valve body 241, and the inner space of the valve body 241 is divided into the first chamber 2412 and the second chamber 2413.

[0055] Further, as shown in Figures 1-3As shown, the vacuum valve 24 further comprises a connecting plate 243 having elasticity; the connecting plate 243 is annularly arranged on the outer circumferential wall of the valve column 242, and the outer edge of the connecting plate 243 is connected with the inner wall of the body 2414. Thus, when the air pressure in the air chamber of the expansion tank is smaller than the atmospheric pressure, the connecting plate 243 having elasticity is attracted to the expansion tank side under the action of the air pressure, so that the valve column 242 moves downward and is disengaged from the pressure regulating rod 21 to open the second air inlet hole 2420.

[0056] Further, as shown in Figure 1 , Figure 4 and Figure 5 , the sealing plate 22 comprises a first extension part 221, a second extension part 222 and a connecting part 223; the second extension part 222 is arranged below the first extension part 221, the first extension part 221 is fixedly connected with the outer circumferential wall of the pressure regulating rod 21, and the outer edge of the second extension part 222 is sealingly connected with the inner wall of the outer cavity 111; the first extension part 221 and the second extension part 222 are fixedly connected through the connecting part 223; the two ends of the spring 23 are respectively abutted with the first extension part 221 and the valve body 241; the second extension part 222 has elasticity; thus, the sealing plate 22 is divided into the first extension part 221, the second extension part 222 and the connecting part 223, the second extension part 222 is arranged to have elasticity, so as to facilitate the second extension part 222 to maintain the sealing connection with the inner wall of the outer cavity 111 when moving relative to the first extension part 221 and the connecting part 223, and the two ends of the spring 23 are respectively abutted with the first extension part 221 and the valve body 241, so that the connecting part 223 is annularly arranged on the outer circumferential wall of the spring 23, thereby improving the stability of the compression and reset movement of the spring 23 during pressure relief and pressure compensation.

[0057] Further, as shown in Figure 1 , Figure 4 and Figure 5 , the side wall of the outer cavity 111 is provided with an annular flange 1111; the bottom surface of the outer edge of the second extension part 222 is sealingly connected with the top surface of the flange 1111; the flange 1111 is arranged to facilitate the sealing connection between the bottom surface of the outer edge of the second extension part 222 and the circumferential wall of the outer cavity 111.

[0058] Further, as shown in Figure 1 and Figure 4As shown, the top of the pressure regulating rod 21 is provided with a handle 211; the handle 211 is provided with a plurality of scale marks, the top of the shell 11 is provided with a standard scale line, the plurality of scale marks are arranged at intervals and are respectively arranged along the radial direction of the pressure regulating rod 21 and extend outward, and the plurality of scale marks are used for corresponding to different pressure relief pressures. The handle 211 is convenient for a user to hold and rotate, so as to adjust the pre-compression stroke of the spring 23; the scale marks cooperate with the standard scale line, so as to facilitate the user to adjust the pressure relief pressure to the pressure relief pressure required by the expansion tank.

[0059] Further, as shown in the drawings, Figure 1 The pressure cover shell 1 further comprises a locking nut 13, the locking nut 13 is arranged above the opening at the top of the shell 11 and is sleeved on the outer periphery of the pressure regulating rod 21; the pressure regulating rod 21 is screwed with the locking nut 13; the locking nut 13 is used for further fixing the pressure regulating rod 21 after adjusting the position of the pressure regulating rod 21, preventing the position from changing and thereby affecting the pre-compression stroke of the spring 23.

[0060] Further, as shown in the drawings, Figure 1 The pressure cover shell 1 further comprises an exhaust pipe 14, one end of the exhaust pipe 14 is connected with the side wall opening of the outer cavity 111; the exhaust pipe 14 guides the external gas to flow into or out of the outer cavity, so that the gas flow is more stable.

[0061] The working process of the utility model is as follows: when the air pressure in the air chamber of the expansion tank is large, the valve body 241 is subjected to an upward lifting force, when the force is greater than the pressure required for the spring 23 to be elastically deformed, the spring 231 is compressed, the valve body 241 is in a pressure relief state, the valve body 241 is lifted and is disconnected with the partition plate 12, so that the inner cavity 112 is communicated with the outer cavity 111, and at this time, the valve column 242 moves upward and is connected with the pressure regulating rod 21 to close the second air inlet hole 2420, so that the second channel 2410 is closed, the high-pressure gas in the expansion tank is discharged into the outer cavity 111 through the gap between the outer wall of the valve body 241 and the inner wall of the outer cavity 111, and then is discharged to the outside from the side wall opening of the outer cavity 111, so that the pressure relief is realized.

[0062] When the gas pressure in the gas chamber of the expansion water tank is small and less than the atmospheric pressure, the valve body 241 is in a pressure compensation state, the valve body 241 is in contact with the partition plate 12, and the elastic connecting plate 243 is attracted to the side of the expansion water tank under the action of the gas pressure, so that the valve column 242 moves downward and is disconnected from the pressure regulating rod 21 to open the second air inlet hole 2420, so as to open the second channel 2410, and the gas is sucked into the outer cavity 111 under the action of the pressure difference, and then enters the inner cavity 112 through the second channel 2410 and finally reaches the gas chamber of the expansion water tank, so as to realize pressure compensation.

[0063] In summary, the utility model embodiment provides a kind of fuel cell expansion water tank pressure cover 100, it includes pressure cover shell 1 and pressure regulating component 2;The inner cavity 112 in the shell body 11 is used to be directly communicated with the gas chamber of expansion water tank, and the inner cavity 112 is communicated with the atmosphere by the outer cavity 111;The spring 23 is vertically arranged, and its two ends are respectively in contact with the sealing plate 22 and valve body 241, so that the valve body 241 is kept in contact with the partition plate 12;When the gas pressure in the gas chamber of the expansion water tank is large, the valve body 241 is subjected to a force that is lifted upward, and when the force is greater than the pressure required for elastic deformation of the spring 23, the spring 231 is compressed, and the valve body 241 is in a pressure relief state, the valve body 241 is lifted, and is disconnected from the partition plate 12, so that the inner cavity 112 is communicated with the outer cavity 111, and the second channel 2410 is closed, and the high-pressure gas in the expansion water tank is discharged to the outer cavity 111 through the gap between the outer wall of the valve body 241 and the inner wall of the outer cavity 111, and then discharged to the outside from the side wall opening of the outer cavity 111, so as to realize pressure relief. When the gas pressure in the gas chamber of the expansion water tank is small and less than the atmospheric pressure, the valve body 241 is in a pressure compensation state, the valve body 241 is in contact with the partition plate 12, and the second channel 2410 is opened, and the gas is sucked into the outer cavity 111 under the action of the pressure difference, and then enters the inner cavity 112 through the second channel 2410 and finally reaches the gas chamber of the expansion water tank, so as to realize pressure compensation. In addition to the general pressure relief and vacuum pressure compensation, by adjusting the position of the pressure regulating rod 21, the position of the sealing plate 22 in the outer cavity 111 is changed, so that the pre-compression stroke of the spring 23 abutting between the sealing plate 22 and the valve body 241 is changed, and then the pressure required for elastic deformation of the spring 23 is changed, and then the adjustable pressure relief pressure of the pressure cover is realized, so as to adapt to different fuel cell system application scenarios and improve the applicability of the fuel cell expansion water tank pressure cover.

[0064] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the utility model, a number of improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection range of the utility model.

Claims

1. A fuel cell expansion tank pressure cover characterized by, The pressure cover shell and the pressure regulating assembly are included; The pressure cover shell includes a shell and a partition plate, the shell is hollow with both ends open, the partition plate is fixedly connected to the inner wall of the shell and separates the internal space of the shell into an outer cavity and an inner cavity from top to bottom, and the side wall of the outer cavity is open; a first channel is formed in the partition plate and connects the outer cavity and the inner cavity; The pressure regulating assembly includes a pressure regulating rod, a sealing plate, a spring and a vacuum valve; The vacuum valve includes a valve body, the valve body is hollow with both ends open, the valve body is arranged in the outer cavity and is sealingly connected to the top surface of the partition plate to cover the first channel; a second channel is formed in the valve body and connects the outer cavity and the inner cavity; The pressure regulating rod is vertically arranged and movably passes through the outer cavity from top to bottom, the sealing plate is fixedly connected to the outer peripheral wall of the pressure regulating rod, and the outer edge of the sealing plate is sealingly connected to the inner wall of the outer cavity; the sealing plate is elastic; The upper end opening of the shell is provided with an internal thread, the pressure regulating rod is screwed with the shell, and the spring is vertically arranged and abuts against the sealing plate and the valve body at both ends; The valve body can be switched between pressure relief and pressure compensation states; when the valve body is in the pressure relief state, the valve body is disconnected from the partition plate, the inner cavity is communicated with the outer cavity, and the second channel is closed; when the valve body is in the pressure compensation state, the valve body is connected to the partition plate, the second channel is open, and the inner cavity and the outer cavity are communicated through the second channel.

2. The fuel cell expansion tank pressure cover of claim 1, wherein, The vacuum valve further includes a valve column; A plurality of first air inlet holes are formed in the top of the valve body and pass through the inner and outer surfaces of the valve body; The valve column is movably connected to the inner wall of the valve body and separates the internal space of the valve body into a first chamber and a second chamber from top to bottom; A second air inlet hole is formed in the valve column and passes through the upper and lower surfaces of the valve column, and the first air inlet hole, the first chamber, the second air inlet hole and the second chamber are sequentially communicated to form the second channel; The bottom of the pressure regulating rod passes through the top opening of the valve body and is movably connected to the valve column in the first chamber; When the valve body is in the pressure relief state, the valve body is disconnected from the partition plate, the inner cavity is communicated with the outer cavity, and the valve column moves upward to be connected to the pressure regulating rod to close the second air inlet hole; when the valve body is in the pressure compensation state, the valve body is connected to the partition plate, the valve column moves downward to be disconnected from the pressure regulating rod to open the second air inlet hole.

3. The fuel cell expansion tank pressure cover of claim 2, wherein, The valve body includes a main body and an extension body extending upward, and both the main body and the extension body are hollow with both ends open; The lower end opening of the extension body is connected to the upper end opening of the main body; The spring is sleeved on the outer periphery of the extension body and abuts against the sealing plate and the main body at both ends; The valve column is connected to the inner wall of the main body and movably passes through the internal space of the extension body; The outer periphery of the valve column and the inner wall of the extension body jointly enclose the first chamber, and the outer periphery of the valve column and the inner wall of the main body jointly enclose the second chamber.

4. The fuel cell expansion tank pressure cover of claim 3, wherein, The vacuum valve further comprises a connecting plate, which is elastic; The connecting plate is annularly arranged on the outer circumferential wall of the valve post, and the outer edge of the connecting plate is connected with the inner wall of the body.

5. The fuel cell expansion tank pressure cover of claim 1, wherein, The sealing plate comprises a first extension, a second extension and a connecting portion; The second extension is arranged below the first extension, the first extension is fixedly connected with the outer circumferential wall of the pressure regulating rod, and the outer edge of the second extension is sealingly connected with the inner wall of the outer cavity; The first extension and the second extension are fixedly connected through the connecting portion; The two ends of the spring are respectively abutted with the first extension and the valve body; The second extension is elastic.

6. The fuel cell expansion tank pressure cover of claim 5, wherein, The side wall of the outer cavity is provided with an annular flange; The bottom surface of the outer edge of the second extension is sealingly connected with the top surface of the flange.

7. The fuel cell expansion tank pressure cover of claim 1, wherein, The top of the pressure regulating rod is provided with a handle; The handle is provided with a plurality of scale marks, the top of the shell is provided with a standard scale line, the plurality of scale marks are arranged at intervals and are respectively arranged to extend outward along the radial direction of the pressure regulating rod, and the plurality of scale marks are used to correspond to different pressure relief pressures.

8. The fuel cell expansion tank pressure cover of claim 1, wherein, The pressure cover shell further comprises a locking nut, the locking nut is arranged above the opening at the top of the shell and is sleeved on the outer circumferential wall of the pressure regulating rod; The pressure regulating rod is screwed with the locking nut.

9. The fuel cell expansion tank pressure cover of claim 1, wherein, The pressure cover shell further comprises an exhaust pipe, one end of the exhaust pipe is connected with the side wall opening of the outer cavity.

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