Limiting piece, energy accumulator and vehicle

Abstract

The utility model relates to a limiting part, an energy accumulator and a vehicle, the limiting part is applied to the energy accumulator, a diaphragm is arranged in the energy accumulator and divides an inner cavity of the energy accumulator into an upper cavity and a lower cavity, and the limiting part is in a disc shape, is provided with a limiting concave surface and is configured to be arranged in the upper cavity so as to limit movement of the diaphragm through the limiting concave surface when the pressure of the lower cavity is increased. According to the energy accumulator, the limiting piece is arranged in the inner cavity, movement of the diaphragm is limited through the limiting piece, the diaphragm can be prevented from being pulled and damaged, meanwhile, due to the fact that the limiting piece is of a disc-shaped structure, the diaphragm can be prevented from being cut or scratched by the limiting piece, and the service life of the energy accumulator can be prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a limiting piece, an energy accumulator and a vehicle. BACKGROUND

[0002] In the related art, a limiting piece is usually arranged in an energy accumulator to limit the movement of a diaphragm, so as to avoid excessive stress of the diaphragm due to excessive folding, thereby avoiding or alleviating the damage of the diaphragm due to pulling. However, the structure of the limiting piece is prone to cutting the diaphragm and causing damage to the diaphragm when the oil cavity pressure of the energy accumulator is too large, thereby affecting the service life of the energy accumulator. SUMMARY

[0003] Embodiments of the present application provide a limiting piece, an energy accumulator and a vehicle, which are used to avoid damage of the diaphragm by the limiting piece, so as to at least partially solve the above technical problems.

[0004] In order to achieve the above purpose, according to a first aspect of the present application, a limiting piece is provided, which is applied to an energy accumulator, the energy accumulator is provided with a diaphragm, the diaphragm divides an inner cavity of the energy accumulator into an upper cavity and a lower cavity, the limiting piece is disc-shaped, has a limiting concave surface, and is configured to be arranged in the upper cavity to limit the movement of the diaphragm by the limiting concave surface when the pressure of the lower cavity increases.

[0005] Optionally, the limiting concave surface is a smooth arc surface.

[0006] Optionally, the limiting piece further has a shape matching surface facing away from the limiting concave surface, and a connecting surface connecting the shape matching surface and the limiting concave surface, the shape matching surface is configured to be matched with a cavity surface of the upper cavity facing away from the lower cavity.

[0007] Optionally, a connecting portion of the connecting surface and the limiting concave surface is provided with a rounded corner.

[0008] Optionally, the diaphragm is fixed to the energy accumulator by a snap ring, and the connecting surface is configured to be matched with a surface of the snap ring facing away from the diaphragm.

[0009] Optionally, the connecting surface is a stepped surface.

[0010] Optionally, the limiting piece further includes a first boss protruding from the shape matching surface, and the first boss is configured to be in contact with the cavity surface of the upper cavity facing away from the lower cavity.

[0011] Optionally, the limiting piece includes a plurality of first bosses, and the plurality of first bosses are arranged at intervals along the circumference of the limiting piece on the shape matching surface.

[0012] Optionally, in a projection plane perpendicular to the axial direction of the limiting piece, the projection of the first boss is in the shape of a fan ring.

[0013] Optionally, the plurality of first bosses are arranged at equal angular intervals along the circumference of the limiting piece.

[0014] Optionally, the distance between the inner arc of the fan ring and the axis of the limiting member is 0.2-0.5 times the radius of the limiting member.

[0015] Optionally, the limiting member further comprises a second boss protruding from the connecting surface, and the second boss is configured to contact the snap ring for fixing the diaphragm.

[0016] Optionally, the limiting member comprises a plurality of second bosses, and the plurality of second bosses are arranged at intervals along the circumference of the limiting member; and / or, the plurality of second bosses are arranged at equal intervals along the circumference of the limiting member.

[0017] Optionally, the connecting surface comprises a first step surface connected with the shape-fitting surface and a second step surface connected with the limiting concave surface, and the second boss comprises a first sub-boss arranged on the first step surface and a second sub-boss arranged on the second step surface.

[0018] Optionally, the connection between the first step surface and the shape-fitting surface is rounded; and / or, the connection between the second step surface and the limiting concave surface is rounded.

[0019] Optionally, the number of the first sub-bosses is a plurality, and the plurality of first sub-bosses are arranged at intervals along the circumference of the limiting member on the first step surface; and / or, the number of the second sub-bosses is a plurality, and the plurality of second sub-bosses are arranged at intervals along the circumference of the limiting member on the second step surface; and / or, the first sub-bosses and the second sub-bosses are arranged one-to-one.

[0020] Optionally, the plurality of first sub-bosses are arranged at equal angular intervals along the circumference of the limiting member on the first step surface; and / or, the plurality of second sub-bosses are arranged at equal angular intervals along the circumference of the limiting member on the second step surface.

[0021] Optionally, the limiting member is provided with an air channel, and the air channel is used for accommodating the gas in the upper cavity and / or for charging / discharging the upper cavity.

[0022] Optionally, the air channel comprises:

[0023] a converging groove formed in the shape-fitting surface;

[0024] a first guide groove formed in the shape-fitting surface, one end of the first guide groove being in communication with the converging groove, and the other end extending to the edge of the shape-fitting surface.

[0025] Optionally, the converging groove is coaxially arranged with the limiting member.

[0026] Optionally, the air channel comprises a plurality of first guide grooves, and the plurality of first guide grooves are distributed at intervals along the circumference of the limiting member on the shape-fitting surface.

[0027] Optionally, the air channel further comprises:

[0028] a second guide groove formed in the connecting surface, one end of the second guide groove being in communication with the first guide groove, and the other end extending to the limiting concave surface.

[0029] Optionally, the air passage comprises a plurality of second guide grooves, which are equidistantly distributed along the circumference of the limiting member on the connecting surface.

[0030] Optionally, the number of the second guide grooves is the same as that of the first guide grooves, and the second guide grooves and the first guide grooves are in one-to-one correspondence.

[0031] Optionally, the limiting member has a middle part and a peripheral part along its radial direction, and the thickness of the middle part is smaller than that of the peripheral part.

[0032] According to a second aspect of the present application, an accumulator is provided, comprising:

[0033] a housing having an inner cavity;

[0034] a diaphragm arranged in the inner cavity and separating the inner cavity into an upper cavity and a lower cavity; and

[0035] the above-mentioned limiting member is arranged in the upper cavity, and the limiting concave surface faces the diaphragm to limit the movement of the diaphragm when the pressure in the lower cavity increases.

[0036] Optionally, the accumulator further comprises a snap ring for fixing the diaphragm on the housing and fixing the limiting member.

[0037] Optionally, the accumulator further comprises:

[0038] a sealing cover corresponding to the position of the converging groove of the limiting member.

[0039] According to a third aspect of the present application, a vehicle is also provided, comprising the above-mentioned accumulator.

[0040] By arranging the limiting member in the inner cavity of the accumulator and limiting the movement of the diaphragm by the limiting member, the diaphragm can be prevented from being damaged by being pulled, thereby prolonging the service life of the accumulator. At the same time, since the limiting member has a disc structure, the diaphragm can be prevented from being damaged by the limiting member, thereby prolonging the service life of the accumulator.

[0041] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0043] In order to more completely understand the present application and its advantages, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0044] Figure 1 This is a three-dimensional schematic diagram of a position limiting member provided in an embodiment of the present application;

[0045] Figure 2 is a three-dimensional schematic diagram of a position limiting member provided in an embodiment of the present application from another perspective;

[0046] Figure 3 is a top view of a position limiting member provided in an embodiment of the present application;

[0047] Figure 4 is a cross-sectional view of a position limiting member provided in an embodiment of the present application;

[0048] Figure 5 This is a cross-sectional view of an accumulator provided in an embodiment of the present application.

[0049] Description of reference numerals:

[0050] 1. Positioning member; 10. Positioning concave surface; 11. Matching surface; 12. Connecting surface; 121. First step surface; 122. Second step surface; 13. First boss; 14. Second boss; 141. First sub-boss; 142. Second sub-boss; 15. Airway; 151. Converging groove; 152. First guide groove; 153. Second guide groove;

[0051] 2. Diaphragm;

[0052] 3. Snap ring;

[0053] 4. Shell;

[0054] 5. Sealing cover. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0056] During the working process of the accumulator, as the oil end pressure of the accumulator rises, the diaphragm continuously moves to the gas end. When a certain pressure ratio is reached, the top of the diaphragm is in contact with the upper shell of the accumulator. At this time, if the oil end pressure continues to rise, the middle part between the top and the root of the diaphragm will gradually be in contact with the upper shell of the accumulator. In this process, the diaphragm is continuously pulled by the oil end pressure, causing the diaphragm to crack and break faster. When the middle part of the diaphragm is in contact with the upper shell of the accumulator, the bending angle of the root of the diaphragm is too large, and the stress borne by the diaphragm at the bending position increases, causing the diaphragm to be easily damaged. In the related art, a limiting block is arranged in the accumulator to limit the movement of the diaphragm, so as to avoid or alleviate the damage of the diaphragm due to pulling. However, a hole is arranged in the middle of the common limiting block. When the accumulator is in a high pressure working condition, part of the diaphragm (usually the part of the diaphragm where the diaphragm protection buckle is arranged) will be extruded into the hole, causing the diaphragm to be extruded and damaged, or causing the position where the diaphragm contacts the hole edge to be cut.

[0057] Based on this, the embodiments of the present application provide a limiting piece, an accumulator with the limiting piece, and a vehicle with the accumulator. The exemplary embodiments of the limiting piece and the accumulator provided by the present application will be described below with reference to the accompanying drawings.

[0058] Please refer to Figure 1 , Figure 2 and Figure 5 , the embodiments of the present application provide a limiting piece. Figure 1 is a three-dimensional schematic view of a limiting piece provided by the embodiments of the present application, Figure 2 is a three-dimensional schematic view of another view of a limiting piece provided by the embodiments of the present application, Figure 5 is a sectional view of an accumulator provided by the embodiments of the present application.

[0059] The limiting piece 1 is applied to an accumulator, the accumulator is provided with a diaphragm 2, the diaphragm 2 separates the inner cavity of the accumulator into an upper cavity and a lower cavity, the limiting piece 1 is disc-shaped, has a limiting concave surface 10, and is configured to be arranged in the upper cavity to limit the movement of the diaphragm 2 through the limiting concave surface 10 when the pressure in the lower cavity increases.

[0060] It should be noted that the disc-shaped limiting piece 1 means that the limiting piece 1 has no perforation along its axial direction. In other words, the limiting concave surface 10 is a continuous surface along the radial direction of the limiting piece 1. Alternatively, in the projection plane perpendicular to the axial direction of the limiting piece 1, the projection of the limiting piece 1 is a complete circular region.

[0061] In some embodiments, the limiting piece 1 is a solid structure, which can be injection molded by plastic PA11.

[0062] It can be understood that when the diaphragm 2 is pulled, the root of the diaphragm 2 (i.e. the connection between the diaphragm 2 and the inner cavity) is easily pulled and damaged. When the lower cavity pressure increases, the diaphragm 2 moves under the action of the pressure to the limiting piece 1, and when the diaphragm 2 passes the snap ring 3 (for fixing the diaphragm 2) of the accumulator, the diaphragm 2 gradually contacts the limiting concave surface 10, which supports the diaphragm 2 to avoid being excessively pulled and damaged due to continuous movement. At the same time, when the diaphragm 2 moves to the limit position (adheres to the limiting concave surface 10), because the limiting piece 1 is a disc structure, compared with the limiting block with a hole in the related art, the diaphragm 2 can be prevented from being damaged by the limiting piece 1, such as being cut or torn, thereby improving the service life of the accumulator with the limiting piece 1.

[0063] In some embodiments, the limiting concave surface 10 is a smooth arc surface. In this way, when the diaphragm 2 adheres to the limiting concave surface 10, the diaphragm 2 can be prevented from being cut or torn by the limiting concave surface 10, thereby improving the service life of the accumulator.

[0064] In some embodiments, the limiting piece 1 further has a shape matching surface 11 facing away from the limiting concave surface 10, and a connecting surface 12 connecting the shape matching surface 11 and the limiting concave surface 10, and the shape matching surface 11 is configured to be matched with the cavity surface of the upper cavity facing away from the lower cavity. By matching the shape matching surface 11 with the cavity surface of the upper cavity facing away from the lower cavity, the gap between the limiting piece 1 and the upper cavity of the accumulator can be reduced, the volume of the upper cavity can be increased, and thus the adjusting capacity of the accumulator can be increased.

[0065] In some embodiments, the connecting surface 12 is rounded at the connection with the limiting concave surface 10. By adopting such a scheme, when the diaphragm 2 adheres to the limiting piece 1, the diaphragm 2 can be prevented from being cut or torn by the connection between the connecting surface 12 and the limiting concave surface 10, thereby improving the service life of the accumulator.

[0066] In some embodiments, the diaphragm 2 is fixed to the accumulator by the snap ring 3, and the connecting surface 12 is configured to be matched with the surface of the snap ring 3 facing away from the diaphragm 2. By matching the connecting surface 12 with the surface of the snap ring 3 facing away from the diaphragm 2, the gap between the limiting piece 1 and the snap ring 3 can be reduced, the volume of the upper cavity can be increased, and thus the adjusting capacity of the accumulator can be increased. In addition, the diaphragm 2 can also be prevented from being squeezed into the gap between the limiting piece 1 and the snap ring 3, being pulled and damaged, or being cut or torn by the snap ring 3 or the limiting piece 1 under the action of the pressure.

[0067] In some embodiments, the connecting surface 12 is a stepped surface. It can be understood that the stepped surface is helpful for fixing the limiting piece 1 by the snap ring, and enhances the stability of the internal structure of the accumulator.

[0068] Please refer to Figures 1 to 3 , Figure 3is a top view of a limiting piece provided by an embodiment of the present application. In some embodiments, the limiting piece 1 further comprises a first boss 13 protruding from the shape matching surface 11, which is configured to contact the cavity surface of the upper cavity away from the lower cavity.

[0069] It can be understood that by setting the first boss, over-constraint can be avoided between the shape matching surface 11 and the cavity wall of the upper cavity due to excessive contact area.

[0070] Please continue to refer to Figures 1 to 3 In some embodiments, the limiting piece 1 comprises a plurality of first bosses 13, which are arranged at intervals along the circumference of the limiting piece 1 on the shape matching surface 11. By adopting such a scheme, different gaps between the shape matching surface 11 at different positions and the cavity wall of the upper cavity can be avoided, thereby avoiding the situation of abnormal sound caused by different gaps.

[0071] In some embodiments, the plurality of first bosses 13 are arranged at equal angular intervals along the circumference of the limiting piece 1. In this way, the situation of abnormal sound caused by different gaps between the shape matching surface 11 at different positions and the cavity wall of the upper cavity can be further avoided.

[0072] In some embodiments, in a projection plane perpendicular to the axial direction of the limiting piece 1, the projection of the first boss 13 is in the shape of a fan ring.

[0073] In some embodiments, the distance between the inner arc of the fan ring and the axis of the limiting piece 1 is 0.2-0.5 times the radius of the limiting piece 1.

[0074] The present application avoids over-constraint between the shape matching surface 11 and the cavity wall of the upper cavity by setting the first boss 13, but the effect is different depending on the position of the first boss 13. For example, if the first boss 13 is arranged at the top of the limiting piece 1 and close to the axis of the limiting piece 1, the edge position of the shape matching surface 11 will still be in contact with the cavity wall of the upper cavity, and there will still be a certain degree of over-constraint problem. Or, if the first boss 13 is arranged at the edge position of the shape matching surface 11, the top of the limiting piece 1 (i.e. the center position of the shape matching surface 11) will still be in contact with the cavity wall of the upper cavity, and there will still be a certain degree of over-constraint problem. In the embodiments of the present application, by setting the distance between the inner arc of the fan ring and the axis of the limiting piece 1 to be 0.2-0.5 times the radius of the limiting piece 1, over-constraint between the shape matching surface 11 and the cavity wall of the upper cavity can be better avoided.

[0075] Please refer to Figure 2 and Figure 3 In some embodiments, the limiting piece 1 further comprises a second boss 14 protruding from the connecting surface 12, which is configured to contact the snap ring 3 for fixing the diaphragm 2.

[0076] It can be understood that, similar to the connection relationship between the shape matching surface 11 and the upper cavity wall, the connecting surface 12 of the limiting piece 1 and the clasp 3 are also in surface contact, and thus there is a risk of over-constraint. Therefore, the second boss 14 is arranged on the connecting surface 12 to avoid over-constraint between the connecting surface 12 and the clasp 3, and to prevent the limiting piece 1 from impacting the clasp 3 and making an abnormal sound.

[0077] In some embodiments, the limiting piece 1 includes a plurality of second bosses 14, and the plurality of second bosses 14 are arranged at intervals along the circumference of the limiting piece 1.

[0078] Exemplarily, the plurality of second bosses 14 are arranged at equal intervals along the circumference of the limiting piece 1.

[0079] It can be understood that, by arranging the second bosses 14 at intervals along the circumference of the limiting piece 1, it can be ensured that the connecting surface 12 is only in contact with the clasp 3 through the second bosses 14, thereby effectively avoiding over-constraint between the connecting surface 12 and the clasp 3. Furthermore, by arranging the plurality of second bosses 14 at equal intervals along the circumference of the limiting piece 1, over-constraint between the connecting surface 12 and the clasp 3 can be further avoided.

[0080] Please refer to Figures 2 to 4 , Figure 4 is a sectional view of a limiting piece provided by an embodiment of the present application. In some embodiments, the connecting surface 12 includes a first stepped surface 121 connected with the shape matching surface 11 and a second stepped surface 122 connected with the limiting concave surface 10, and the second boss 14 includes a first sub-boss 141 arranged on the first stepped surface 121 and a second sub-boss 142 arranged on the second stepped surface 122.

[0081] It can be understood that, because the connecting surface 12 is shaped to match the surface of the clasp 3 away from the diaphragm 2, when the surface of the clasp 3 away from the diaphragm 2 is a stepped surface having a plurality of steps, the connecting surface 12 is also a stepped surface having a plurality of steps. For this case, by arranging the first sub-boss 141 on the first stepped surface 121 connected with the shape matching surface 11 and arranging the second sub-boss 142 on the second stepped surface 122 connected with the limiting concave surface 10, the effect of avoiding over-constraint between the connecting surface 12 and the clasp 3 can be achieved. At the same time, sub-bosses do not need to be arranged on other stepped surfaces, which helps to reduce the number of sub-bosses, thereby reducing the processing difficulty and production cost.

[0082] In some embodiments, the connection between the first stepped surface 121 and the shape matching surface 11 is arranged in a rounded corner.

[0083] It can be understood that when the edge or corner of the object is sharp, there is usually a problem of stress concentration at these parts, resulting in a stress much higher than other areas, which is prone to cause cracks, and with the continuous action of stress, the cracks will continue to expand, eventually leading to the breakage or damage of the object. The present application adopts the setting of the rounded corner of the connection between the first step surface 121 and the shape matching surface 11, which can avoid damage to the limiting piece 1 and avoid damage to the connection between the first step surface 121 and the connecting surface 12 due to bumping during assembly. At the same time, the design of the rounded corner is also beneficial to the gas entering and exiting the upper chamber of the accumulator.

[0084] In some embodiments, the connection between the second step surface 122 and the limiting concave surface 10 is set as a rounded corner. In this way, the diaphragm 2 can be prevented from being cut or torn when it is attached to the limiting piece 1 by the connection between the second step surface 122 and the limiting concave surface 10, thereby improving the service life of the accumulator.

[0085] In some embodiments, the number of first sub-convexes 141 is multiple, and the multiple first sub-convexes 141 are arranged on the first step surface 121 at intervals along the circumference of the limiting piece 1.

[0086] In some embodiments, the number of second sub-convexes 142 is multiple, and the multiple second sub-convexes 142 are arranged on the second step surface 122 at intervals along the circumference of the limiting piece 1.

[0087] Further, the first sub-convexes 141 and the second sub-convexes 142 can be arranged one-to-one.

[0088] In some embodiments, the multiple first sub-convexes 141 are arranged on the first step surface 121 at equal angular intervals along the circumference of the limiting piece 1.

[0089] In some embodiments, the multiple second sub-convexes 142 are arranged on the second step surface 122 at equal angular intervals along the circumference of the limiting piece 1.

[0090] Please refer to Figures 1 to 3 In some embodiments, the limiting piece 1 is provided with an air channel 15, which is used for charging / discharging of the upper chamber, or accommodating the gas overflowing from the upper chamber due to the increase of pressure in the lower chamber.

[0091] It can be understood that the balance volume of the accumulator is proportional to its volume, and the opening of the air channel 15 on the limiting piece 1 can increase the accommodation space of the gas in the upper chamber, so as to increase the balance volume of the accumulator, thereby improving the performance of the accumulator. In addition, the pressure regulation capacity of the accumulator is also related to the size of the accommodation space of the gas in the upper chamber, so the opening of the air channel 15 on the limiting piece 1 can also control the pressure regulation capacity of the accumulator. In addition, the air channel 15 is also used for charging the upper chamber or discharging the gas in the upper chamber during the production or maintenance inspection of the accumulator.

[0092] Please continue to refer toFigures 1 to 3 In some embodiments, the gas passage 15 comprises: a converging groove 151 formed in the shape-fitting surface 11; and a first guide groove 152 formed in the shape-fitting surface 11, one end of the first guide groove 152 being in communication with the converging groove 151 and the other end extending to the edge of the shape-fitting surface 11.

[0093] It can be understood that, by using such a scheme, the gas in the upper cavity is converged to the converging groove 151 through the first guide groove 152, the gas containing space of the accumulator is increased, and thus the performance of the accumulator is improved.

[0094] In some embodiments, the converging groove 151 is coaxially arranged with the limiting member 1.

[0095] It can be understood that, since the converging groove 151 is in communication with each first guide groove 152, the position of the converging groove 151 is related to the length of the first guide groove 152, and the length of the first guide groove 152 is related to its gas containing capacity. If the gas containing capacities of the first guide grooves 152 are different, the movement distances of each part of the diaphragm 2 to the limiting concave surface 10 will be different, and eventually it may lead to that part of the diaphragm 2 has contacted with the limiting concave surface 10 while the other part still has gas between it and the limiting concave surface 10, which will lead to that the stretching degrees of each part of the diaphragm 2 are different. In the long run, the part with more stretching times and more serious stretching deformation will be damaged earlier than other parts, which will lead to the shortening of the service life of the diaphragm 2. The present application helps to ensure that the lengths of the first guide grooves 152 are the same, and thus the gas containing capacities of the first guide grooves 152 are the same, i.e., the movement distances of each part of the diaphragm 2 are the same, by coaxially arranging the converging groove 151 with the limiting member 1, which can avoid the situation that part of the diaphragm 2 is stretched, and helps to improve the service life of the accumulator.

[0096] Please continue to refer to Figures 1 to 3 In some embodiments, the gas passage 15 comprises a plurality of first guide grooves 152, which are distributed on the shape-fitting surface 11 along the circumference of the limiting member 1. Here, the effect of coaxially arranging the converging groove 151 with the limiting member 1 is similar or the same, which will not be described here again.

[0097] Please refer to Figure 2 and Figure 3 In some embodiments, the gas passage 15 further comprises a second guide groove 153 formed in the connecting surface 12, one end of the second guide groove 153 being in communication with the first guide groove 152 and the other end extending to the limiting concave surface 10. Here, the effect of forming the first guide groove 152 in the shape-fitting surface 11 is similar or the same, which will not be described here again.

[0098] Please continue to refer to Figure 2 and Figure 3In some embodiments, the air passage 15 comprises a plurality of second guide grooves 153, which are equidistantly distributed along the circumference of the limiting member 1 on the connecting surface 12. The effect of the plurality of second guide grooves 153 is similar or identical to that of the plurality of first guide grooves 152 on the shape matching surface 11, which will not be described herein again.

[0099] Please continue to refer to Figure 2 and Figure 3 In some embodiments, the number of the second guide grooves 153 is identical to that of the first guide grooves 152, and the second guide grooves 153 are in one-to-one correspondence with the first guide grooves 152.

[0100] The present application helps to accommodate the gas in the air cavity by the first guide grooves 152 and the second guide grooves 153, reduces the gas between the diaphragm 2 and the limiting concave surface 10, increases the movable distance of the diaphragm 2, increases the balance volume of the accumulator, and thus improves the performance of the accumulator.

[0101] Please refer to Figure 4 In some embodiments, the limiting member 1 has a middle part and a peripheral part along its radial direction, and the thickness of the middle part is smaller than that of the peripheral part.

[0102] It can be understood that such a scheme enables the limiting member 1 to smoothly connect with the connecting part of the snap ring 3 while being attached to the wall of the accumulator cavity, so that the diaphragm 2 will not be squeezed into the gap between the limiting member 1 and the snap ring 3 when the diaphragm 2 moves toward the limiting concave surface 10 under the action of pressure, thereby preventing the diaphragm 2 from being squeezed or pulled to damage.

[0103] The second aspect of the present application provides an accumulator, please refer to Figure 5 , Figure 5 is a cross-sectional view of an accumulator provided by an embodiment of the present application. The accumulator comprises a shell 4 having an inner cavity, a diaphragm 2 arranged in the inner cavity and separating the inner cavity into an upper cavity and a lower cavity, and the above-mentioned limiting member 1 arranged in the upper cavity, with the limiting concave surface 10 facing the diaphragm 2 to limit the movement of the diaphragm 2 when the pressure in the lower cavity increases.

[0104] It can be understood that when the diaphragm 2 is pulled, the root of the diaphragm 2 (i.e., the connecting part of the diaphragm 2 and the inner cavity) is prone to be damaged by pulling. The present application limits the movement of the diaphragm 2 by arranging the limiting member 1 in the inner cavity, which can prevent the diaphragm 2 from being damaged by pulling, thereby improving the service life of the accumulator.

[0105] Please continue to refer to Figure 5 In some embodiments, the accumulator further comprises a snap ring 3 for fixing the diaphragm 2 to the shell 4 and fixing the limiting member 1.

[0106] Please continue to refer to Figure 5In some embodiments, the energy accumulator further comprises a sealing cover 5 corresponding to the position of the converging groove 151 of the limiting member 1.

[0107] It can be understood that, by using such a scheme, the gas in the upper cavity can be discharged through the sealing cover 5 when the energy accumulator is maintained or inspected.

[0108] According to a third aspect of the present application, a vehicle is further provided, which comprises the energy accumulator described above. The vehicle has all the beneficial effects of the energy accumulator described above, which will not be repeated herein.

[0109] The vehicle can be a fuel automobile, a plug-in hybrid electric vehicle or a new energy vehicle, etc., which is not specifically limited in the present application.

[0110] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0111] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0112] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0113] The above is only the preferred embodiments of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A limiter, applied to an accumulator, wherein a diaphragm is provided in the accumulator, and the diaphragm separates the inner cavity of the accumulator into an upper cavity and a lower cavity, characterized in that: The limiting member is disc-shaped, has a limiting concave surface, and is configured to be disposed in the upper chamber so as to limit the movement of the diaphragm through the limiting concave surface when the pressure in the lower chamber increases.

2. The limiting member according to claim 1, characterized in that: The limiting concave surface is a smooth arc surface.

3. The limiting member according to claim 1, characterized in that: The limiting member further comprises a matching surface facing away from the limiting concave surface, and a connecting surface connecting the matching surface and the limiting concave surface. The matching surface is configured to match with a cavity surface of the upper cavity facing away from the lower cavity.

4. The limiting member according to claim 3, characterized in that: The connection between the connecting surface and the limiting concave surface is rounded.

5. The limiting member according to claim 4, characterized in that: The diaphragm is fixed to the accumulator via a clamping ring, and the connecting surface is configured to be form-matched with a surface of the clamping ring facing away from the diaphragm.

6. The limiting member according to claim 5, characterized in that: The connecting surface is a stepped surface.

7. The limiting member according to any one of claims 3 to 6, characterized in that: The limiting member further includes a first boss protruding from the form-matching surface, and the first boss is configured to contact a cavity surface of the upper cavity facing away from the lower cavity.

8. The limiting member according to claim 7, characterized in that: The limiting member includes a plurality of first bosses, and the plurality of first bosses are arranged on the matching surface at intervals along the circumference of the limiting member.

9. The limiting member according to claim 8, characterized in that: In a projection plane perpendicular to the axial direction of the limiting member, the projection of the first boss is in a sector ring shape.

10. The limiting member according to claim 9, characterized in that: The plurality of first bosses are arranged at equal angular intervals along the circumference of the limiting member.

11. The limiting member according to claim 9, characterized in that: The distance between the inner arc of the sector ring and the axis of the limiting member is 0.2 to 0.5 times the radius of the limiting member.

12. The limiting member according to any one of claims 3 to 6, characterized in that: The limiting member further includes a second boss protruding from the connecting surface, and the second boss is configured to contact a clamping ring for fixing the diaphragm.

13. The limiting member according to claim 12, characterized in that: The limiting member includes a plurality of second bosses, and the plurality of second bosses are arranged at intervals along the circumference of the limiting member; and / or the plurality of second bosses are arranged at equal intervals along the circumference of the limiting member.

14. The limiting member according to claim 12, characterized in that: The connecting surface includes a first step surface connected to the form-matching surface and a second step surface connected to the limiting concave surface, and the second boss includes a first sub-boss arranged on the first step surface and a second sub-boss arranged on the second step surface.

15. The limiting member according to claim 14, characterized in that: The connection between the first step surface and the matching surface is configured as a chamfered corner; and / or the connection between the second step surface and the limiting concave surface is configured as a chamfered corner.

16. The limiting member according to claim 14, characterized in that: There are multiple first sub-bosses, and multiple first sub-bosses are arranged on the first step surface at intervals along the circumference of the limit member; and / or there are multiple second sub-bosses, and multiple second sub-bosses are arranged on the second step surface at intervals along the circumference of the limit member; and / or, the first sub-bosses and the second sub-bosses are arranged in a one-to-one correspondence.

17. The limiting member according to claim 16, characterized in that: A plurality of first sub-bosses are arranged on the first step surface at equal angular distances along the circumference of the limiting member; and / or a plurality of second sub-bosses are arranged on the second step surface at equal angular distances along the circumference of the limiting member.

18. The limiting member according to any one of claims 3 to 6, characterized in that: An air channel is provided on the limiting member, and the air channel is used for inflating / deflating the upper chamber, or storing gas overflowing from the upper chamber when the pressure in the lower chamber increases.

19. The limiting member according to claim 18, characterized in that: The airway comprises: A confluence groove is provided on the shaped matching surface; A first guide groove is provided on the matching surface, one end of the first guide groove is communicated with the confluence groove, and the other end of the first guide groove extends to the edge of the matching surface.

20. The limiting member according to claim 19, characterized in that: The confluence groove and the limiting member are coaxially arranged.

21. The limiting member according to claim 19, characterized in that: The air channel includes a plurality of the first guide grooves, and the plurality of the first guide grooves are distributed on the matching surface at intervals along the circumference of the limiting component.

22. The limiting member according to claim 19, characterized in that: The airway also includes: The second guide groove is provided on the connecting surface, one end of the second guide groove is communicated with the first guide groove, and the other end of the second guide groove extends to the limiting concave surface.

23. The limiting member according to claim 22, characterized in that: The air channel includes a plurality of second guide grooves, and the plurality of second guide grooves are distributed on the connecting surface at equal intervals along the circumference of the limiting member.

24. The limiting member according to claim 23, characterized in that: The number of the second guide grooves is the same as the number of the first guide grooves, and the second guide grooves are connected in a one-to-one correspondence.

25. The limiting member according to claim 1, characterized in that: The limiting member has a middle portion and a peripheral portion along its radial direction, and the thickness of the middle portion is smaller than the thickness of the peripheral portion.

26. An accumulator, characterized in that: include: a housing having an inner cavity; a diaphragm, disposed in the inner cavity and dividing the inner cavity into an upper cavity and a lower cavity; and The limiting member according to any one of claims 1 to 25 is arranged in the upper cavity, and the limiting concave surface faces the diaphragm to limit the movement of the diaphragm when the pressure in the lower cavity increases.

27. The accumulator according to claim 26, characterized in that The accumulator further includes a clamping ring, which is used to fix the diaphragm on the housing and fix the limiting member.

28. The accumulator according to claim 26, characterized in that The accumulator further comprises: The sealing cover corresponds to the position of the confluence groove of the limiting member.

29. A vehicle, characterized in that: The accumulator comprising any one of claims 26 to 28.

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