CN216131436U

CN216131436U - Pressure stabilizing valve

Info

Publication number: CN216131436U
Application number: CN202121023841.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Ninebot Changzhou Technology Co Ltd
Current assignee: Ninebot Changzhou Technology Co Ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2022-03-25
Anticipated expiration: 2031-05-13

Abstract

The embodiment of the utility model provides a pressure stabilizing valve. This surge damping valve includes: the valve comprises a valve shell, a spring, a sealing plug and an adjusting piece; the valve shell is provided with a hollow cavity, and the spring and the sealing plug are accommodated in the hollow cavity; a valve seat is arranged in the hollow cavity of the valve shell, and the sealing plug is sealed at the valve seat under the action of elastic force of a spring; the adjusting piece extends into the hollow cavity and is provided with a protruding structure extending into a pitch gap of the spring, and the adjusting piece is rotatably arranged on the valve shell; the adjusting piece is used for adjusting or setting the pressure relief pressure of the pressure stabilizing valve, and the number of spring turns between the extending structure and the sealing plug is related to the pressure relief pressure of the pressure stabilizing valve. According to the technical scheme provided by the embodiment of the utility model, the adjustable pressure relief pressure of the pressure stabilizing valve is realized, and the pressure relief requirements of different products can be met.

Description

Pressure stabilizing valve

Technical Field

The utility model relates to the technical field of valves, in particular to a pressure stabilizing valve.

Background

Pneumatic tires of vehicles such as balance cars, scooters or electric cars on the market have the phenomenon that the air pressure in the pneumatic tire is slowly reduced in the process of storage or transportation. The air pressure in the pneumatic tire is simply referred to as tire pressure. When the tire pressure is too low or too high, the riding comfort of the riding vehicle is greatly reduced. The tire pressure is too high, can use the surge damping valve to adjust the tire pressure.

At present, a pressure stabilizing valve is only suitable for adjusting the tire pressure of tires of a type of products (such as balance cars or bicycles).

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a pressure stabilizing valve with adjustable relief pressure.

Specifically, in one embodiment of the present invention, a pressure maintaining valve is provided. This surge damping valve includes: the valve comprises a valve shell, a spring, a sealing plug and an adjusting piece; the valve shell is provided with a hollow cavity, and the spring and the sealing plug are accommodated in the hollow cavity;

a valve seat is arranged in the hollow cavity of the valve shell, and the sealing plug is sealed at the valve seat under the action of the elastic force of the spring;

the adjusting piece extends into the hollow cavity and is provided with a protruding structure extending into a pitch gap of the spring, and the adjusting piece is rotatably arranged on the valve shell; the adjusting piece is used for adjusting or setting the pressure relief pressure of the pressure stabilizing valve, and the number of spring turns between the extending structure and the sealing plug is related to the pressure relief pressure of the pressure stabilizing valve.

Optionally, the adjustment member comprises a support rod; the spring is sleeved on the supporting rod; the extending structure is arranged on the supporting rod; the valve shell is provided with a mounting hole; one end of the supporting rod is rotatably arranged in the mounting hole; rotation of the support bar can cause the projection to spiral up or down along the pitch gap of the spring to change the number of turns of the spring between the projection and the sealing plug.

Optionally, a first limiting structure is arranged on the hole wall of the mounting hole; the supporting rod is provided with a second limiting structure;

the first limiting structure is matched with the second limiting structure to limit the supporting rod to rotate relative to the mounting hole;

when the supporting rod is subjected to a rotating acting force, the second limiting structure is separated from the first limiting structure, so that the supporting rod is convenient to rotate relative to the mounting hole.

Optionally, the first limiting structure comprises one or more elastic sheets arranged at intervals along the circumferential direction of the mounting hole;

the second limiting structure comprises one or more limiting grooves which are arranged at intervals along the circumferential direction of the supporting rod;

the elastic sheet is embedded into the limiting groove to limit the supporting rod to rotate relative to the mounting hole;

when the supporting rod is subjected to a rotating acting force, the elastic sheet is separated from the limiting groove, so that the supporting rod can rotate relative to the mounting hole.

Optionally, one end of the spring has an extension extending axially along itself;

the valve shell is provided with a limiting hole;

the extension section is installed in the limiting hole.

Optionally, a mounting groove is formed in the sealing plug, and the other end of the spring is located in the mounting groove.

Optionally, the spring is a tower spring.

Optionally, a first pressure relief port and a second pressure relief port which are communicated with the hollow cavity are formed in the valve housing;

a pressure relief passage is arranged between the first pressure relief opening and the second pressure relief opening;

when the sealing plug is sealed at the valve seat, the pressure relief passage is disconnected;

after the sealing plug leaves the valve seat, the pressure relief passage is communicated so as to circulate pressure relief airflow.

Optionally, a gas release needle is arranged on the valve housing;

the first pressure relief opening is formed in the air relief needle.

Optionally, the air release needle is a conical protrusion;

a plurality of air holes extending along the central axis direction of the conical bulge are formed in the conical wall of the conical bulge;

the plurality of air holes form the first pressure relief opening.

Optionally, the valve housing is provided with a connecting part for connecting with a valve of a pneumatic tire;

the connecting part is provided with a connecting groove, and the air leakage needle is positioned at the groove bottom of the connecting groove.

Optionally, the valve housing comprises: an upper housing and a lower housing;

the lower shell and the upper shell are connected to form the hollow cavity;

the lower shell is provided with the valve seat, the air release needle and the connecting part;

the second pressure relief opening is formed in the upper shell.

Optionally, a connection gap between the lower housing and the upper housing serves as the second pressure relief opening.

In the technical scheme provided by the embodiment of the utility model, the pressure maintaining valve comprises a valve shell, a spring, a sealing plug and an adjusting piece. The valve shell is provided with a hollow cavity, and the spring and the sealing plug are accommodated in the hollow cavity. The valve seat is arranged in the hollow cavity of the valve shell, and the sealing plug is sealed at the valve seat under the elastic force action of the spring. The adjusting piece is rotatably arranged on the valve shell and extends into the cavity of the middle valve shell; the extending structure rotates along with the adjusting piece, so that the extending structure spirally rises or falls along the pitch clearance of the spring, and the number of turns of the spring between the extending structure and the sealing plug can be changed; due to the fact that the number of the spring turns between the extending structure and the sealing plug is different, the compression amount of the spring in the area range (the area between the extending structure and the sealing plug) is changed (namely the acting force of the spring on the sealing plug is changed), and then the load relief pressure of the pressure stabilizing valve is adjusted. Therefore, according to the scheme provided by the embodiment of the utility model, the pressure relief pressure of the pressure stabilizing valve can be changed through assembly, so that the pressure stabilizing valve can be applied to products with different pressure relief pressure requirements, the applicability of the pressure stabilizing valve is improved, and the application range of the pressure stabilizing valve is expanded.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a pressure maintaining valve according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a pressure maintaining valve provided in accordance with an embodiment of the present invention;

FIG. 3 is an exploded view of FIG. 1;

fig. 4 is a schematic structural view of a supporting rod according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an upper housing according to an embodiment of the present invention;

FIG. 6 is an enlarged view of portion A of FIG. 5;

fig. 7 is a schematic structural diagram of a pressure maintaining valve according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It should be noted that, the descriptions of "first", "second", etc. in this document are used for distinguishing different structures, devices, modules, etc., and do not represent a sequential order, nor limit the types of "first" and "second" to be different. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In addition, the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present embodiment provides a pressure maintaining valve. As shown in fig. 1, the pressure maintaining valve includes: the valve comprises a valve shell 1, a spring 2, a sealing plug 3 and an adjusting piece; the valve shell 1 is provided with a hollow cavity, and the spring 2 and the sealing plug 3 are accommodated in the hollow cavity; a valve seat 4 is arranged in the hollow cavity of the valve shell 1, and the sealing plug 3 is sealed at the valve seat 4 under the action of the elastic force of the spring 2. The adjusting piece extends into the hollow cavity and is provided with a protruding structure 5 extending into a pitch gap of the spring 2, and the adjusting piece is rotatably arranged on the valve shell 1; the adjusting piece is used for adjusting or setting the pressure relief pressure of the pressure stabilizing valve, and the number of spring turns between the extending structure 5 and the sealing plug 3 is related to the pressure relief pressure of the pressure stabilizing valve.

Wherein, the projecting structure 5 rotates with the adjusting piece and moves in the pitch gap of the spring 2 to change the number of spring coils between the projecting structure 5 and the sealing plug 3, so that the relief pressure of the pressure stabilizing valve is changed.

The pressure stabilizing valve is arranged on an inflating valve of the inflating tire, so that the tire pressure of the inflating tire can be adjusted. Specifically, when the force generated by the tire pressure in the pneumatic tire on the sealing plug 3 is greater than the force generated by the spring 2 pressing on the sealing plug 3, the sealing plug 3 is pushed open to form a gap with the valve seat 4; the gas in the pneumatic tire leaks out through the gap. When the force generated by the tire pressure in the pneumatic tire on the sealing plug 3 is equal to or less than the force pressed by the spring 2 on the sealing plug 3, the sealing plug 3 is sealed on the valve seat 4 under the elastic force of the spring 2, and the gas in the pneumatic tire cannot escape. Therefore, in the embodiment of the utility model, the extension structure 5 on the adjusting piece is driven to rotate by rotating the adjusting piece, so that the number of the spring turns between the extension structure 5 and the sealing plug is changed, the acting force of the spring on the sealing plug can be changed, and the relief pressure of the pressure stabilizing valve is also changed.

Because the comfortable riding tire pressure requirements of different types of vehicles on the pneumatic tires are different, the pressure stabilizing valve with one type of pressure relief pressure cannot meet the requirements of different types of vehicles, and therefore the pressure stabilizing valve with the adjustable pressure relief pressure provided by the embodiment can be used. When the pressure regulating valve is applied to different types of vehicles, the pressure of the pressure regulating valve can be changed through assembly so as to adapt to the requirements of the corresponding types of vehicles on the tire pressure of the tires. It can be seen that this embodiment sets up to be adjustable through the pressure value of unloading that has with the surge damping valve for the surge damping valve can be applicable to the vehicle of different grade type, also uses the surge damping valve of a structure alright satisfy the pressure release demand of the pneumatic tire of type vehicle not, and then has improved the suitability of surge damping valve, thereby has enlarged the application scope of surge damping valve.

Specifically, referring to fig. 2, fig. 2 is a cross-sectional view of a pressure maintaining valve. After the pressure stabilizing valve is installed on the inflating valve of the pneumatic tire, high-pressure gas in the pneumatic tire enters the pressure stabilizing valve through the inflating valve. As shown in fig. 2, when the force of the high-pressure gas inside the pneumatic tire acting on the sealing plug 3 is greater than the force of the spring 2 pressing on the sealing plug 3, the sealing plug 3 located above the valve seat 4 is pushed upwards, so that a gap is generated between the sealing plug 3 and the valve seat 4, and thus, the gas inside the pneumatic tire can leak out from the gap between the sealing plug 3 and the valve seat 4 to release the pressure of the pneumatic tire. In the process of continuously releasing the pressure of the pneumatic tire, the tire pressure of the pneumatic tire is gradually reduced until the tire pressure of the pneumatic tire is reduced to the point that the acting force of the spring 2 pressing on the sealing plug 3 cannot be overcome, the sealing plug 3 is sealed at the valve seat 4 again under the elastic force action of the spring 2, the pressure stabilizing valve is closed, and the pressure release of the pneumatic tire is completed.

It should be noted that, when the tire pressure of the pneumatic tire is reduced to the comfortable riding tire pressure of the vehicle, the pressure stabilizing valve needs to be detached from the inflating valve of the pneumatic tire, so that the phenomenon that the pressure stabilizing valve is mistakenly opened due to sudden rise of the tire pressure caused by ground bump in the riding process of the vehicle to influence the normal running of the vehicle is avoided.

Further, referring to fig. 2, the adjusting member includes a support rod 6; the spring 2 is sleeved on the support rod 6 and is linked with the support rod 6; the extending structure 5 is arranged on the supporting rod 6; the valve shell 1 is provided with a mounting hole 7; one end of the supporting rod 6 is rotatably arranged in the mounting hole 7; the support bar 6 is rotated so that the projection 5 spirals up or down the pitch gap of the spring 2 to change the number of turns of the spring between the projection 5 and the sealing plug 3.

It should be noted that, referring to fig. 2, the support rod 6 is vertically arranged, the spring 2 is sleeved around the support rod 6, and one end of the spring (the upper end of the spring in fig. 2) is fixed with the valve housing 1; meanwhile, as the extension structure 5 is fixed on the support rod 6, when the sealing plug 3 is sealed at the valve seat 4, the space distance between the extension structure 5 and the sealing plug is not changed. In this way, the number of turns of the spring between the projection 5 and the sealing plug 3 can be varied during rotation of the drive strut 6 within the mounting hole 7 in the valve housing 1 as the projection 5 rotates with the strut 6. Specifically, in the position shown in fig. 2, after the protruding structure 5 is mounted on the supporting rod 6, the spring 2 is divided into two sections, which are the upper section and the lower section in fig. 2, and in the process that the protruding structure 5 rotates along with the supporting rod 6, the protruding structure 5 spirally rises or falls along the pitch gap of the spring 2, so that the number of turns of the lower section of the spring can be changed, that is, the number of turns of the spring of the bracket of the protruding structure 5 and the sealing plug 3 is changed, the compression amount of the spring in the area (within the fixed distance between the sealing plug 3 and the protruding structure 5) can be changed, and therefore, the acting force of the spring 2 pressing the sealing plug 3 can be changed, and the adjustable relief pressure of the pressure stabilizing valve can be realized.

In particular, when one end of the spring 2 is mounted on the valve housing 1, as can be seen in fig. 3, one end of said spring 2 is provided with an extension 201 extending axially along itself; a limiting hole (not shown in fig. 3) is formed in the valve housing 1; the extension 201 is mounted in the retaining hole to mount the spring 2 on the valve housing. Of course, the specific installation manner between the end of the spring 2 and the valve housing 1 is not limited thereto, and any other suitable installation manner may be used, which is not illustrated herein.

Further, as shown in fig. 2, the sealing plug 3 may be provided with a mounting groove 31, and the other end of the spring 2 is located in the mounting groove 31, so that the sealing plug 3 can move synchronously with the other end of the spring.

For example, referring to FIG. 2, it will be appreciated that the spring 2 shown in FIG. 2 is divided into upper and lower sections by the extension 5. When the pressure relief pressure of the pressure stabilizing valve needs to be increased, the rotatable support rod 6 drives the extension structure 5 to rotate, and the extension structure 5 moves in the pitch gap of the spring 2, so that the spring 2 has downward movement amount relative to the extension structure 5, the number of turns of the upper section of the spring 2 is reduced, the number of turns of the lower section of the spring is increased, the elastic force applied to the sealing plug 3 is increased, and the pressure relief pressure of the pressure stabilizing valve is increased. It should be noted that, when the type of the spring is selected, the length of the extending section of the spring itself is set to be matched with the supporting rod, so as to prevent the extending section 201 from being separated from the limiting hole on the supporting rod 6 due to too few turns of the upper section of the spring.

Specifically, the protruding structure 5 may be a pin, for example, a pin hole is formed on the supporting rod 6, and the pin is connected to the supporting rod 6. Of course, the specific form of the protruding structure 5 is not limited thereto, and those skilled in the art can set the protruding structure to any suitable form in practical implementation, and will not be described herein too much.

Alternatively, referring to fig. 2, the spring 2 may be a tower spring, a large end of the tower spring is located at the upper end, and the large end of the tower spring extends out of the extension section 201, so that the extension section on the large end of the tower spring is located at the outermost periphery of the support rod 6 due to the large spiral radius of the large end, and thus, the installation of the extension section 201 and the limiting hole on the valve housing 1 is facilitated.

Further, as shown in fig. 2, a first limiting structure 8 is disposed on a hole wall of the mounting hole 7; a second limiting structure is arranged on the supporting rod 6; the first limiting structure 8 is matched with the second limiting structure to limit the support rod 6 to rotate relative to the mounting hole 7; when the supporting rod 6 is under the rotating action force, the second limiting structure is separated from the first limiting structure 8, so that the supporting rod 6 is convenient to rotate relative to the mounting hole 7.

Specifically, as shown in fig. 3 and 4, the support rod 6 may take a stepped shaft shape. As shown in fig. 4, the support rod 6 may include a first shaft section 61 and a second shaft section 62, and the shaft diameter of the second shaft section 62 is larger than that of the first shaft section 61. With continued reference to fig. 2, the mounting hole 7 may be configured as a stepped hole to facilitate secure mounting of the first shaft section 61 and the second shaft section 62 within the mounting hole 7. That is to say, this embodiment is through setting up first limit structure 8 on the pore wall of mounting hole 7, is provided with second limit structure 9 on the primary shaft section 61 on bracing piece 6, and first limit structure 8 and second limit structure 9 mating reaction for when bracing piece 6 is not receiving the exogenic action, avoid bracing piece 6 to rotate relative mounting hole 7 on the valve casing 1, also can ensure when not driving the bracing piece rotation, the number of spring turns between limit structure 5 and the sealing plug 3 is unchangeable.

Referring to fig. 5 and 6, the first limiting structure 8 may include one or more elastic sheets arranged along the circumferential direction of the mounting hole at intervals. As shown in fig. 4, the second position-limiting structure 9 includes one or more position-limiting grooves arranged at intervals along the circumferential direction of the support rod. After the pressure stabilizing valve is assembled, as shown in fig. 2, the elastic sheet is embedded into the limiting groove to limit the support rod 6 to rotate relative to the mounting hole 7; when the supporting rod 6 is under the action of rotation force, the elastic sheet is separated from the limiting groove, so that the supporting rod can rotate relative to the mounting hole 7.

Optionally, referring to fig. 6, the elastic sheet may have two insertion sheets with a certain included angle, the two insertion sheets intersect to form a vertex angle, an installation groove for installing the elastic sheet is formed in the hole wall of the installation hole 7, and the two insertion sheets of the elastic sheet are inserted into the installation groove to fix the elastic sheet in the installation groove integrally.

Optionally, as shown in fig. 4, a plurality of spacing grooves are formed in the first shaft section 61 of the support rod 6, and the edges of the walls of the spacing grooves are smooth arc-shaped walls, so that when an acting force is applied to the support rod, the elastic sheet has elasticity to deform the elastic sheet, and the elastic sheet can conveniently slide out of one spacing groove to move to a position of another spacing groove.

Please refer to fig. 4-6, the specific matching between the elastic sheet and the limiting groove is understood, the supporting rod 6 is provided with a plurality of limiting grooves, and only one elastic sheet is arranged on the hole wall of the mounting hole 7, so that the elastic sheet is separated from one limiting groove and continuously enters the next limiting groove in the process of continuously acting external force on the supporting rod to rotate the supporting rod 6, and so on.

For example, the relief pressure of the pressure maintaining valve can have a plurality of gear ranges, and the adjustment of different gears can be realized by rotating the supporting rod to different angles. The advantage of design like this, during actual operation, operator's accessible rotation support pole 6 to certain angle, alright change sealing plug 3 and stretch out the structure 5 and confirm the number of coils in the space to make the pressure stabilizing valve let out and carry pressure adjustable.

When the installation structure is specifically implemented, in some embodiments, a plurality of limiting grooves can be uniformly distributed on the hole wall of the installation hole 7, a plurality of elastic sheets are correspondingly and uniformly distributed on the support rod 6, and the plurality of elastic sheets correspond to the plurality of limiting grooves one to one. In other embodiments, only one limiting groove is arranged on the wall of the mounting hole 7, and only one elastic sheet is arranged on the support rod 6, and the elastic sheet corresponds to the limiting groove. In more embodiments, as shown in fig. 4 to 6, a plurality of limiting grooves are formed on the hole wall of the mounting hole 7, only one elastic piece is arranged on the support rod 6, when the support rod is continuously rotated, the elastic piece is sequentially matched with the remaining limiting grooves after being disengaged from the first limiting groove, and when the elastic piece is disengaged from the limiting groove, a 'click' prompt sound can be emitted, so that an operator can conveniently control the rotation angle of the support rod, and the number of turns of the spring between the sealing plug 3 and the extending structure 5 can be adjusted to be the required number of turns, so that the pressure relief pressure of the surge damping valve can be quickly adjusted to be the required value. During the concrete implementation, can also set up the valve casing into transparent material, also make things convenient for the operator to observe out the sealing plug 3 and stretch out the spring coil number between 5 structures, be convenient for control surge damping valve's regulation gear.

Specifically, as shown in fig. 1, the surface of the support rod 6 exposed outside the valve housing may be further provided with a driving part 10, and the driving part 10 is used for driving the support rod to rotate. For example, as shown in fig. 1, the driving portion 10 is a hexagonal hole, and an operator can place a hexagonal wrench in the hexagonal hole to rotate the support rod 6 to adjust the relief pressure of the pressure regulator valve.

In practical implementation, the surface of the sealing plug 3 for sealing against the valve seat 4 may be provided with a first sealing ring 11, and during the process that the sealing plug 3 gradually approaches the valve seat 4, the first sealing ring 11 is pressed to deform so as to reliably seal the sealing plug 3 against the valve seat 4. The valve seat 4 may be constructed, for example, as shown in fig. 2, and a table-like structure is provided in the valve housing 1. As shown in fig. 2, the surface of the mesa-like structure facing the sealing plug 3 may be provided with a chamfer, which facilitates the contact of the first sealing ring 11 with the chamfer and the secure sealing of the sealing plug 3 against the valve seat 4. The structure shown in fig. 2 is only an illustration of an alternative structure of the valve seat 4, and the specific design form of the valve seat 4 can be specifically designed according to actual requirements, which is not exemplified herein.

Further, the valve housing 1 is provided with a first pressure relief port 14 and a second pressure relief port which are communicated with the hollow cavity. A pressure relief passage is arranged between the first pressure relief opening and the second pressure relief opening; when the sealing plug 3 is sealed at the valve seat 4, the pressure relief path is broken; after the sealing plug 3 is separated from the valve seat 4, the relief passage is communicated to allow the relief air flow. After the pressure stabilizing valve is installed on an inflating valve of the pneumatic tire, if high-pressure gas in the pneumatic tire is too high, the acting force of the gas acting on the sealing plug 3 overcomes the force of the spring 2 pressing on the sealing plug 3, the sealing plug 3 is ejected towards the direction far away from the valve seat 4, after a gap is generated between the sealing plug 3 and the valve seat 4, the pressure relief passage is communicated, and the gas in the pneumatic tire can enter the pressure relief passage through the first pressure relief opening and then is discharged through the second pressure relief opening.

Further, referring to fig. 2, the valve housing 1 is provided with a gas release needle 15; the first pressure relief port 14 may be provided on the air relief needle 15. Specifically, when the pressure stabilizing valve is not connected with the inflating valve, a core valve in the inflating valve is closed, and the gas in the pneumatic tire cannot leak; after the regulator valve is mounted to the valve of the pneumatic tire, the air release needle 15 may push open the core in the valve. Specifically, after the core door is pushed open by the release needle 15, if the gas in the pneumatic tire is so high as to push open the sealing plug 3, the gas in the pneumatic tire can be discharged to the atmosphere through the first relief port 14, the relief passage, and the second relief port.

More specifically, referring to the structure shown in fig. 7, the air release needle 15 may be configured as a conical protrusion. A plurality of air holes extending along the central axis direction of the conical bulge are formed in the conical wall of the conical bulge; the plurality of air holes form the first relief port 14. As shown in fig. 4, the first pressure relief opening 14 is a conical wall of the conical protrusion, and 4 air holes extending along the central axis direction of the conical protrusion are provided on the conical wall, and only an alternative arrangement form of the first pressure relief opening is illustrated here. In other implementations, the first pressure relief port 14 may include only one vent, and the specific design of the first pressure relief port is not illustrated here.

Further, as shown in fig. 1, the valve housing 1 is provided with a connecting portion 16 for connecting with a valve of a pneumatic tire; the connecting portion 16 has a connecting groove 17, and the air release needle 15 is located at the bottom of the connecting groove 17.

Specifically, an internal thread may be provided in the connecting groove 17 for use in cooperation with an external thread on a valve of a pneumatic tire to screw the pressure maintaining valve on the valve. Optionally, as shown in fig. 2, a second sealing ring 18 may be provided in the connecting groove 17, so that after the pressure maintaining valve is screwed on the valve, the air pressure in the pneumatic tire is prevented from leaking out from the connecting position of the pressure maintaining valve and the valve. In practical implementation, the second sealing ring 18 and the first sealing ring 11 are made of elastic material, such as rubber, as long as the sealing function can be achieved.

Here, the pressure release process of the pressure maintaining valve is briefly described: after the pressure stabilizing valve is screwed into the valve nozzle, the air leakage needle 15 jacks up the valve core of the valve nozzle, and meanwhile, the end face of the second sealing ring 18 is sealed to avoid air leakage from the connecting position of the connecting groove 17 and the valve nozzle. At this point, the force of the gas on the sealing plug 3 overcomes the resistance of the spring 2 to push the sealing plug 3 open due to the high pressure of the gas in the tire. As the first sealing ring 11 follows the movement of the sealing plug 3 away from the sealing surface, gas is constantly leaking from the side of the first sealing ring 11. When the thrust of the gas acting on the sealing plug 3 cannot overcome the pressure exerted on the sealing plug by the spring 2 along with the reduction of the gas pressure, the first sealing ring 11 is in contact sealing with the sealing surface, and the gas pressure in the tire reaches a set value at the moment, so that the air leakage is stopped.

In a specific embodiment, the valve housing may be assembled from multiple parts in order to facilitate the assembly of the pressure-stabilizing valve, which facilitates the assembly of other parts inside the valve housing. For illustration purposes, and as will be understood with reference to fig. 1 and 2, the valve housing 1 may include an upper housing 20 and a lower housing 19; the lower shell 19 is connected with the upper shell 20 to form the hollow cavity; the valve seat 4, the air release needle 15 and the connecting part 16 are arranged on the lower shell 19; the support rod 6 is mounted in a mounting hole 7 of the upper case 20.

Specifically, as shown in fig. 3, a fastening structure 21 may be disposed on the lower housing 19, a slot structure 22 may be disposed on the upper housing 20, and after the upper housing 20 is connected to the lower housing 19, the fastening structure 21 is disposed in the slot structure 22, so as to fix the upper housing 20 and the lower housing 19. Of course, the connection form of the upper casing 20 and the lower casing 19 is not limited to this, for example, in some other embodiments, the specific connection form of the upper casing 20 and the lower casing 19 may be a threaded connection, an adhesive, a welding, or a connection by adding a fastener.

In particular implementations, for example, in some embodiments, the second pressure relief vent may be an opening disposed on the upper housing. For another example, in some other embodiments, when a specific connection manner of the upper casing and the lower casing causes a connection gap to exist at a connection position between the upper casing and the lower casing, the upper casing does not need to be additionally provided with a second pressure relief opening, and the connection gap between the upper casing and the lower casing can be used as the second pressure relief opening.

As shown in fig. 3, the upper casing 20 may further be provided with anti-slip threads 23, for example, in the case that the upper casing and the lower casing are connected by screw threads, the user can conveniently hold the anti-slip threads 23 of the upper casing, which facilitates quick installation of the upper casing and the lower casing. For example, as shown in fig. 3, the anti-slip pattern 23 is a plurality of strip-shaped protrusions uniformly distributed on the peripheral side of the upper case.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A pressure maintaining valve, comprising: the valve comprises a valve shell, a spring, a sealing plug and an adjusting piece; the valve shell is provided with a hollow cavity, and the spring and the sealing plug are accommodated in the hollow cavity;

2. The surge valve defined in claim 1, wherein the adjustment member comprises a support rod;

the spring is sleeved on the supporting rod;

the extending structure is arranged on the supporting rod;

the valve shell is provided with a mounting hole;

one end of the supporting rod is rotatably arranged in the mounting hole;

rotation of the support bar can cause the projection to spiral up or down along the pitch gap of the spring to change the number of turns of the spring between the projection and the sealing plug.

3. The surge damping valve according to claim 2, wherein a first limiting structure is arranged on the wall of the mounting hole; the supporting rod is provided with a second limiting structure;

4. The surge damping valve according to claim 3, wherein the first limiting structure comprises one or more spring plates arranged at intervals along the circumference of the mounting hole;

5. The surge damping valve according to any one of claims 1 to 4, wherein one end of the spring has an extension extending axially along itself;

the valve shell is provided with a limiting hole;

the extension section is installed in the limiting hole.

6. A pressure maintaining valve according to claim 5, characterized in that the sealing plug is provided with a mounting groove, and the other end of the spring is positioned in the mounting groove.

7. The surge damping valve according to any one of claims 1 to 4, wherein the spring is a tower spring.

8. The surge damping valve according to any one of claims 1 to 4, wherein a first and a second relief port are provided in the valve housing to communicate with the hollow chamber;

9. The surge damping valve according to claim 8, wherein a vent needle is provided on the valve housing;

the first pressure relief opening is formed in the air relief needle.

10. The surge damping valve according to claim 9, wherein the bleed needle is a conical protrusion;

the plurality of air holes form the first pressure relief opening.

11. The surge valve defined in claim 9, wherein the valve housing comprises: an upper housing and a lower housing;

the lower shell and the upper shell are connected to form the hollow cavity;

the lower shell is provided with the valve seat and the air release needle;

the second pressure relief opening is formed in the upper shell.

12. The surge valve according to claim 11, wherein a connection gap between the lower housing and the upper housing serves as the second relief port.