A one-way valve structure and a circuit breaker

Abstract

The present invention discloses a one-way valve structure and a circuit breaker. The one-way valve structure includes a cavity assembly, a connector, a one-way valve plate, a protective cover and an elastic element. When the force exerted by the gas in the auxiliary air chamber on the one-way valve plate is greater than the force exerted by the gas in the thermal expansion chamber on the one-way valve plate, and the difference between the two can overcome the elastic force of the elastic element, the one-way valve plate opens, so that the auxiliary air chamber and the thermal expansion chamber are connected through a connecting hole. When the hot air flow in the auxiliary air chamber enters the thermal expansion chamber, the second end of the protective cover moves to the outside of the first limiting protrusion, that is, the protective cover and the connector form a protective cavity that can completely accommodate the elastic element, thereby preventing the elastic element from being burned by the hot air flow. When the gas in the auxiliary air chamber is cold gas, similarly, the protective cover and the connector form a protective cavity that accommodates the elastic element, thereby avoiding the failure problem caused by annealing of the elastic element caused by the cold air flow passing through the elastic element and then contacting the hot gas in the thermal expansion chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of valve structures, and particularly to a check valve structure and a circuit breaker. Background Art

[0002] A check valve is usually used to separate two cavities with a pressure difference, especially two air chambers with an air pressure difference. There is a connection channel between the two air chambers. The check valve disc of the check valve is closely attached to the outside of the connection channel, completely covering it to close the connection channel. When the check valve disc leaves the outside of the connection channel, the connection channel opens and the two air chambers communicate. If the check valve is designed such that gas can only flow from air chamber A to air chamber B, then only when the air pressure in air chamber A is greater than the action threshold of the check valve disc will the check valve disc act, and no matter how much higher the air pressure in air chamber B is than that in air chamber A, the check valve disc will not act.

[0003] The check valve is generally used in cooperation with an elastic element. The elastic element is in a deformed state, thereby generating a force to ensure that the check valve disc is closely attached to the outside of the connection channel. Therefore, the action threshold of the check valve disc is that the force generated by the air pressure in air chamber A acting on the check valve disc is greater than the sum of the force generated by the air pressure in air chamber B acting on the check valve disc and the force generated by the deformation of the elastic element.

[0004] The check valve can be used in the structure of a high - current circuit breaker to separate the thermal expansion chamber and the auxiliary air chamber of the circuit breaker. The check valve is generally designed such that gas can only enter the thermal expansion chamber from the auxiliary air chamber to ensure that the thermal expansion chamber has a higher pressure.

[0005] In one case, the auxiliary air chamber is filled with high - temperature gas. When the air pressure in the auxiliary air chamber exceeds the action threshold of the check valve disc, the check valve opens and the high - temperature gas in the auxiliary air chamber enters the thermal expansion chamber. In this case, the high - temperature gas will flow through the elastic element. Since the elastic element has a small volume, it will be severely ablated by the high - temperature gas. The metal particles generated after the ablation of the elastic element directly enter the thermal expansion chamber, which will seriously affect the breaking performance.

[0006] In another case, the gas in the auxiliary air chamber is cold gas. In this case, when the check valve acts, the gas in the auxiliary air chamber will not ablate the elastic element. However, the gas in the thermal expansion chamber also has a relatively high temperature during breaking, which may ablate the elastic element or raise the temperature of the elastic element body to a relatively high level. After breaking, the temperature of the elastic element will gradually cool. Since the elastic element is usually made of metal, this process of heating and then cooling is equivalent to annealing the metal, which will reduce the performance of the metal making up the elastic element, thereby causing the elastic element to fail. Summary of the Invention

[0007] In view of this, the first object of the present invention is to provide a check valve structure to protect the elastic element for the movement of the check valve disc from being burned by the high-temperature air flow in a high-temperature air flow environment, and to ensure that the elastic element does not fail due to high temperature.

[0008] The second object of the present invention is to provide a circuit breaker.

[0009] To achieve the above first object, the present invention provides the following solution:

[0010] A check valve structure, comprising:

[0011] A cavity assembly, the cavity assembly having an inner cavity, and the inner cavity being divided into an auxiliary air chamber and a thermal expansion chamber by a partition, and a communication through hole communicating the auxiliary air chamber and the thermal expansion chamber being formed on the partition;

[0012] A connecting member, the connecting member being disposed in the thermal expansion chamber, and a first end thereof being fixed on the partition;

[0013] A check valve disc, the check valve disc being slidably sleeved outside the connecting member;

[0014] A protective cover and an elastic element, a first limiting protrusion being provided at a second end of the connecting member, the protective cover being slidably sleeved outside the connecting member, and a first end of the protective cover abutting against the check valve disc, the elastic element being sleeved inside the protective cover and outside the connecting member, two ends of the elastic element respectively abutting against the first limiting protrusion and an inner wall of an end face of the first end of the protective cover, the elastic element being in a compressed state to drive the check valve disc to block the communication through hole, and when the check valve disc is opened, a second end of the protective cover can slide outside the first limiting protrusion.

[0015] In a specific embodiment, the check valve structure further includes a retaining ring;

[0016] The retaining ring is fixed at the end of the partition facing the thermal expansion chamber, and the check valve disc is sleeved outside the retaining ring;

[0017] A second limiting protrusion is provided on an outer wall of an end of the retaining ring away from the partition, a blind hole capable of accommodating the protective cover is formed on the second limiting protrusion, and at least a part of the connecting member is accommodated in the blind hole;

[0018] The second limiting protrusion can also abut against the check valve disc to limit the check valve disc.

[0019] In another specific embodiment, the number of the communication through holes is at least 2, and the communication through holes are annularly and uniformly distributed on the partition along the axis of the cavity assembly;

[0020] The number of the connecting members is equal to the number of the communication through holes, and the connecting members are installed between adjacent communication through holes.

[0021] In another specific embodiment, the communication through holes are long strip arc-shaped holes;

[0022] and / or

[0023] The elastic element is a spring;

[0024] and / or

[0025] The protective cover is made of high-temperature resistant material.

[0026] In another specific embodiment, a boss is provided at one end of the partition plate facing the thermal expansion chamber;

[0027] The retaining ring is sleeved on the boss.

[0028] In another specific embodiment, the boss is a cylindrical boss, an external thread is provided on the outer wall of the boss, and an internal thread connected to the external thread is provided on the inner wall of the retaining ring;

[0029] Or

[0030] The boss positions the retaining ring, and the retaining ring is connected to the partition plate by screws;

[0031] Or

[0032] The retaining ring is integrally formed and connected to the partition plate.

[0033] In another specific embodiment, the connecting member is a screw;

[0034] Threaded holes are formed in the partition plate and are threadedly connected to the connecting members.

[0035] In another specific embodiment, the first limiting protrusion is the nut of the screw;

[0036] The rod portion of the screw includes a threaded rod portion and a smooth rod portion arranged coaxially. The threaded rod portion is threadedly connected to the threaded hole. The two ends of the smooth rod portion are respectively connected to the threaded rod portion and the nut, and the diameter of the smooth rod portion is larger than the diameter of the threaded rod portion.

[0037] In another specific embodiment, the cavity assembly includes a base, an end cover, an insulating cylinder and a support member;

[0038] One end of the base is hermetically connected to the end cover to form the auxiliary air chamber. One end of the insulating cylinder is hermetically connected to the other end of the base, and the other end of the insulating cylinder is hermetically connected to the support member. The insulating cylinder, the other end of the base and the support member form the thermal expansion chamber;

[0039] The partition is the part of the base for separating the auxiliary air chamber and the thermal expansion chamber.

[0040] The various embodiments of the present invention can be arbitrarily combined as needed. The embodiments obtained after these combinations are also within the scope of the present invention and are part of the specific implementation manners of the present invention.

[0041] In the one-way valve structure provided by the present invention, during use, when the force of the gas in the auxiliary air chamber acting on the one-way valve disc is greater than the force of the gas in the thermal expansion chamber acting on the one-way valve disc, and the difference between the two can overcome the elastic force of the elastic element, the one-way valve disc opens, so that the auxiliary air chamber and the thermal expansion chamber are communicated through the communication through hole. When the hot air flow in the auxiliary air chamber enters the thermal expansion chamber, the second end of the protective cover moves outside the first limit protrusion, that is, the protective cover and the connecting member form a protective cavity that can completely accommodate the elastic element, avoiding the elastic element being burned by the hot air flow.

[0042] When the gas in the auxiliary air chamber is cold gas, similarly, the protective cover and the connecting member form a protective cavity that can completely accommodate the elastic element, avoiding the failure problem caused by the annealing of the elastic element due to the cold air flow entering the thermal expansion chamber from the auxiliary air chamber flowing through the elastic element and then contacting the elastic element with the hot gas in the thermal expansion chamber.

[0043] To achieve the above second object, the present invention provides the following solution:

[0044] A circuit breaker includes the one-way valve structure as described in any one of the above.

[0045] Since the circuit breaker provided by the present invention includes the one-way valve structure in any one of the above, therefore, the beneficial effects of the above one-way valve structure are all included in the circuit breaker disclosed by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0047] Figure 1 It is a schematic cross-sectional structure view of the one-way valve structure provided by the present invention;

[0048] Figure 2 is Figure 1 the schematic cross-sectional structure diagram of A-A section of

[0049] Figure 3 is Figure 1 the schematic enlarged partial structure diagram of

[0050] Figure 4 is the schematic cross-sectional structure diagram of another direction of the one-way valve structure provided by the present invention

[0051] Figure 5 is Figure 4 the schematic cross-sectional structure diagram of B-B section of

[0052] Among them, Figures 1-5 in

[0053] one-way valve structure 100, cavity assembly 101, auxiliary air chamber 101a, thermal expansion chamber 101b, partition 101c, communication through hole 101c-1, connecting piece 102, one-way valve disc 103, protective cover 104, elastic element 105, first limit protrusion 102a, retaining ring 106, second limit protrusion 106a, blind hole 106a-1, boss 101c-2, base 101d, end cover 101e, insulating cylinder 101f, support 101g. Specific embodiments

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top surface", "bottom surface", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] Combined with Figures 1-5 as shown, the present invention provides a one-way valve structure 100 to protect the elastic element 105 that moves the one-way valve disc 103 from being burned by the high-temperature air flow in the high-temperature air flow environment and ensure that the elastic element 105 does not fail due to high temperature.

[0057] Specifically, the one-way valve structure 100 includes a cavity assembly 101, a connecting member 102, a one-way valve disc 103, a protective cover 104, and an elastic element 105.

[0058] The cavity assembly 101 has an inner cavity, and the inner cavity is divided into an auxiliary air chamber 101a and a thermal expansion chamber 101b by a partition 101c. The auxiliary air chamber 101a and the thermal expansion chamber 101b are respectively communicated with their respective pipelines or connectors to be connected.

[0059] A communication through-hole 101c-1 for communicating the auxiliary air chamber 101a and the thermal expansion chamber 101b is provided on the partition 101c. It should be noted that the number and shape of the communication through-holes 101c-1 are not limited, and any through-hole that can communicate the auxiliary air chamber 101a and the thermal expansion chamber 101b belongs to the protection scope of the present invention.

[0060] The connecting member 102 is placed in the thermal expansion chamber 101b, and the first end of the connecting member 102 is fixed on the partition 101c. It can be understood that the connection method between the connecting member 102 and the partition 101c is not limited, and it can be welding, integral molding connection, or detachable connection, etc.

[0061] The one-way valve disc 103 is slidably sleeved outside the connecting member 102. Specifically, a first through-hole is provided on the one-way valve disc 103, and the connecting member 102 passes through the first through-hole on the one-way valve disc 103 to be fixed on the partition 101c.

[0062] A second end of the connecting member 102 is provided with a boss 101c-2 and a first limiting protrusion 102a. The protective cover 104 is slidably sleeved outside the connecting member 102. Specifically, the protective cover 104 is in a cylindrical shape, one end of the protective cover 104 is closed, and the other end is open. A second through-hole is provided on the closed end of the protective cover 104 so that the connecting member 102 can pass through the second through-hole on the protective cover 104 to achieve the slidable connection between the protective cover 104 and the connecting member 102. It should be noted that there is a small gap between the outer wall of the connecting member 102 and the inner wall of the second through-hole to reduce the amount of hot air entering the protective cover 104 through this small gap while realizing the sliding of the protective cover 104 relative to the connecting member 102.

[0063] The first end of the protective cover 104 abuts against the one-way valve disc 103. When the one-way valve disc 103 is opened, the second end of the protective cover 104 can slide outside the boss 101c-2 and the first limiting protrusion 102a. It can be understood that the opening of the one-way valve disc 103 means that the one-way valve disc 103 leaves the partition 101c to conduct the positions of the auxiliary air chamber 101a and the thermal expansion chamber 101b.

[0064] The elastic element 105 is sleeved inside the protective cover 104 and outside the connecting member 102. Two ends of the elastic element 105 are respectively in contact with the first limiting protrusion 102a and the inner wall of the end face of the first end of the protective cover 104.

[0065] The elastic element 105 is in contact with the protective cover 104, avoiding direct contact between the elastic element 105 and the one-way valve piece 103, and further avoiding the failure of the elastic element 105 due to high temperature. Specifically, the protective cover 104 can be made of high-temperature resistant materials, such as polytetrafluoroethylene. It should be noted that the protective cover 104 is not limited to being made of high-temperature resistant materials as a whole, and a high-temperature resistant material layer can also be provided on the surface layer of the protective cover 104, while the inside can be made of any material.

[0066] The elastic element 105 is in a compressed state to drive the one-way valve piece 103 to block the communication through hole 101c-1. Specifically, the elastic element 105 is a spring. It should be noted that the elastic element 105 is not limited to being a spring and can also be other elastic members.

[0067] When the one-way valve structure 100 provided by the present invention is in use, when the force of the gas in the auxiliary air chamber 101a acting on the one-way valve piece 103 is greater than the force of the gas in the thermal expansion chamber 101b acting on the one-way valve piece 103, and the difference between the two can overcome the elastic force of the elastic element 105, the one-way valve piece 103 opens, enabling the auxiliary air chamber 101a and the thermal expansion chamber 101b to be conducted through the communication through hole 101c-1. When the hot air flow in the auxiliary air chamber 101a enters the thermal expansion chamber 101b, the second end of the protective cover 104 moves outside the first limiting protrusion 102a, that is, the protective cover 104 and the connecting member 102 form a protective cavity that can completely accommodate the elastic element 105, avoiding the elastic element 105 being burned by the hot air flow.

[0068] When the gas in the auxiliary air chamber 101a is cold gas, similarly, the protective cover 104 and the connecting member 102 form a protective cavity that can completely accommodate the elastic element 105, avoiding the failure problem of the elastic element 105 caused by annealing when the cold air flow entering the thermal expansion chamber 101b from the auxiliary air chamber 101a flows through the elastic element 105 and then contacts the elastic element 105 with the hot gas in the thermal expansion chamber 101b.

[0069] In some embodiments, the one-way valve structure 100 further includes a retaining ring 106. The retaining ring 106 is fixed at the end of the partition 101c facing the thermal expansion chamber 101b, and the one-way valve piece 103 is sleeved outside the retaining ring 106.

[0070] On the outer wall of the end of the retaining ring 106 away from the partition plate 101c, a second limiting protrusion 106a is provided. A blind hole 106a-1 capable of accommodating the protective cover 104 is formed in the second limiting protrusion 106a, and at least a part of the connecting member 102 is accommodated in the blind hole 106a-1, so that the protective cover 104 can completely enter the blind hole 106a-1.

[0071] Taking the second limiting protrusion 106a and the retaining ring 106 being integrally formed and annularly and uniformly distributed on the retaining ring 106 as an example, that is, the retaining ring 106 and the second limiting protrusion 106a form a stepped structure. It should be noted that the shape of the second limiting protrusion 106a is not limited, and it can also be a block-shaped protrusion arranged at intervals on the retaining ring 106.

[0072] The second limiting protrusion 106a can also abut against the one-way valve piece 103 to limit the one-way valve piece 103.

[0073] Furthermore, the present invention discloses that the number of the communication through holes 101c-1 is at least 2, and they are annularly and uniformly distributed on the partition plate 101c along the axis of the cavity assembly 101, so as to realize the rapid and uniform entry of the air flow in the auxiliary air chamber 101a into the thermal expansion chamber 101b.

[0074] The number of the connecting members 102 is equal to the number of the communication through holes 101c-1, and the connecting members 102 are installed between adjacent communication through holes 101c-1. That is to say, the one-way valve piece 103 is a circular sheet-like structure, which is convenient for simultaneously controlling the simultaneous opening and closing of each communication through hole 101c-1. A first through hole equal to the number of the connecting members 102 is formed in the one-way valve piece 103 to facilitate the installation of each connecting member 102.

[0075] Specifically, the present invention discloses that the communication through hole 101c-1 is a long strip-shaped arc hole, and the axes of all the long strip-shaped arc holes coincide.

[0076] Furthermore, the present invention discloses that a convex platform 101c-2 is provided at the end of the partition plate 101c facing the thermal expansion chamber 101b, and the retaining ring 106 is sleeved on the convex platform 101c-2.

[0077] The setting of the convex platform 101c-2 facilitates the installation of the retaining ring 106.

[0078] Furthermore, the present invention discloses that the boss 101c-2 is a cylindrical boss, and an external thread is provided on the outer wall of the boss 101c-2, and an internal thread connected to the external thread is provided on the inner wall of the retaining ring 106. It should be noted that the boss 101c-2 is not limited to being a cylindrical boss. In practical applications, the boss 101c-2 can also be provided in other shapes, as long as the boss 101c-2 that can be connected to the retaining ring 106 belongs to the protection scope of the present invention. It can be understood that the connection manner between the retaining ring 106 and the partition 101c is not limited to internal and external thread connection, and can also be connected by other fixed connection manners. For example, the boss 101c-2 positions the retaining ring, and the fitting portion between the retaining ring 106 and the partition 101c is connected by screws; or, the retaining ring 106, the partition 101c and the boss 101c-2 are integrally formed and connected.

[0079] Specifically, the present invention discloses that the connecting member 102 is a screw rod, and a threaded hole for threaded connection with the connecting member 102 is provided on the partition 101c.

[0080] By setting the connecting member 102 as a screw rod in the present invention, it is convenient for the disassembly and assembly of the connecting member 102 and the partition 101c.

[0081] Correspondingly, the first limiting protrusion 102a is the nut of the screw rod. Specifically, the nut has a hexagonal structure, and the length of the opposite sides is slightly larger than the outer diameter of the elastic element 105.

[0082] The rod portion of the screw rod includes a threaded rod portion and a smooth rod portion arranged coaxially. The threaded rod portion is threadedly connected to the threaded hole. The two ends of the smooth rod portion are respectively connected to the threaded rod portion and the nut. The diameter of the smooth rod portion is larger than the diameter of the threaded rod portion, so as to form a limiting step at the connection between the smooth rod portion and the threaded rod portion, which is convenient for adjusting the lengths of the connecting members 102 exposed from the partition 101c to be equal, so as to ensure that the elastic elements 105 apply uniform force to the one-way valve piece 103.

[0083] In some embodiments, the cavity assembly 101 includes a base 101d, an end cap 101e, an insulating cylinder 101f and a support 101g. One end of the base 101d is hermetically connected to the end cap 101e to form an auxiliary air chamber 101a.

[0084] One end of the insulating cylinder 101f is hermetically connected to the other end of the base 101d, and the other end of the insulating cylinder 101f is hermetically connected to the support 101g. The insulating cylinder 101f, the other end of the base 101d and the support 101g form a thermal expansion chamber 101b.

[0085] The partition 101c is the part of the base 101d for separating the auxiliary air chamber 101a and the thermal expansion chamber 101b.

[0086] In the present invention, when the pressure in the auxiliary air chamber 101a is less than the operating threshold of the one-way valve structure 100, the one-way valve structure 100 is in a closed state, as shown in Figure 1 and Figure 2 When the pressure in the auxiliary air chamber 101a is greater than the operating threshold of the one-way valve structure 100, the one-way valve structure 100 starts to operate, as shown in Figure 3 、 Figure 4 and Figure 5 The one-way valve plate 103 moves leftward along the connecting member 102, and the high-temperature gas in the auxiliary air chamber 101a enters the thermal expansion chamber 101b through the connecting channel on the base 101d and the space lifted by the one-way valve plate 103. At this time, the protective cover 104 also moves in the direction of the retaining ring 106 under the push of the one-way valve plate 103, and the elastic element 105 is compressed between the protective cover 104 and the second limiting protrusion 106a, and gradually enters the blind hole 106a-1 of the retaining ring 106. When the one-way valve plate 103 moves to the position where it abuts against the retaining ring 106 and stops moving, the protective cover 104 and the elastic element 105 completely enter the blind hole 106a-1 of the retaining ring 106. At this time, the one-way valve structure 100 is filled with high-temperature gas, and the elastic element 105 is protected by the protective cover 104 and the retaining ring 106 to avoid being burned by the hot air flow.

[0087] It should be noted that the operating threshold means that the force of the gas in the auxiliary air chamber 101a acting on the one-way valve plate 103 is greater than the force of the gas in the thermal expansion chamber 101b acting on the one-way valve plate 103, and the difference between the two can overcome the elastic force of the elastic element 105.

[0088] The second aspect of the present invention provides a circuit breaker, including the one-way valve structure 100 as described in any one of the above.

[0089] Since the circuit breaker provided by the present invention includes the one-way valve structure 100 in any one of the above embodiments, the beneficial effects of the above one-way valve structure 100 are all included in the circuit breaker disclosed by the present invention.

[0090] It should be noted that the words indicating directions in this article, such as left, right, top, bottom, etc., are all set according to the directions in Figure 1 for the convenience of description only and do not have any other specific meanings.

[0091] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0092] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0093] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] The preferred embodiments of the present invention disclosed above are only used to assist in explaining the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments shown. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A one-way valve structure, characterized in that, Comprising: A cavity assembly having an inner cavity, and the inner cavity is divided into an auxiliary air chamber and a thermal expansion chamber by a partition plate, and a communication through hole communicating the auxiliary air chamber and the thermal expansion chamber is provided on the partition plate; A connecting member disposed in the thermal expansion chamber, and a first end thereof is fixed on the partition plate; A check valve disc slidably sleeved outside the connecting member; A protective cover and an elastic element, a first limiting protrusion is provided at a second end of the connecting member, the protective cover is slidably sleeved outside the connecting member, and a first end of the protective cover abuts against the check valve disc, the elastic element is sleeved inside the protective cover and outside the connecting member, two ends of the elastic element respectively abut against the first limiting protrusion and an end face inner wall of the first end of the protective cover, the elastic element is in a compressed state to drive the check valve disc to block the communication through hole, and when the check valve disc is opened, a second end of the protective cover can slide outside the first limiting protrusion, and the protective cover and the connecting member form a protective cavity capable of completely accommodating the elastic element; The protective cover is made of a high-temperature resistant material.

2. The one-way valve structure according to claim 1, characterized in that, Further comprising a retaining ring; The retaining ring is fixed at an end of the partition plate facing the thermal expansion chamber, and the check valve disc is sleeved outside the retaining ring; A second limiting protrusion is provided on an outer wall of an end of the retaining ring away from the partition plate, a blind hole capable of accommodating the protective cover is provided on the second limiting protrusion, and at least a part of the connecting member is accommodated in the blind hole; The second limiting protrusion can also abut against the check valve disc to limit the check valve disc.

3. The one-way valve structure according to claim 2, wherein, The number of the communication through holes is at least 2, and the communication through holes are annularly and uniformly distributed on the partition plate along the axis of the cavity assembly; The number of the connecting members is equal to the number of the communication through holes, and the connecting members are installed between adjacent communication through holes.

4. The one-way valve structure according to claim 3, characterized in that, The communication through hole is a long strip arc-shaped hole or a circular hole; And / or The elastic element is a spring.

5. The one-way valve structure according to claim 2, wherein, A boss is provided at an end of the partition plate facing the thermal expansion chamber; The retaining ring is sleeved on the boss.

6. The one-way valve structure according to claim 5, characterized in that, The boss is a cylindrical boss, and an external thread is provided on an outer wall of the boss, and an internal thread connected to the external thread is provided on an inner wall of the retaining ring; Or The boss positions the retaining ring, and the retaining ring and the partition plate are connected by screws; Or The retaining ring and the partition plate are integrally formed and connected.

7. The one-way valve structure according to claim 1, characterized in that, The connecting member is a screw rod; A threaded hole threadedly connected to the connecting member is provided on the partition plate.

8. The one-way valve structure according to claim 7, wherein The first limiting protrusion is a nut of the screw rod; A rod portion of the screw rod includes a threaded rod portion and a smooth rod portion arranged coaxially, the threaded rod portion is threadedly connected to the threaded hole, two ends of the smooth rod portion are respectively connected to the threaded rod portion and the nut, and a diameter of the smooth rod portion is larger than a diameter of the threaded rod portion.

9. The one-way valve structure according to any one of claims 1-8, characterized in that The cavity assembly includes a base, an end cover, an insulating cylinder and a support member; One end of the base is hermetically connected to the end cover to form the auxiliary air chamber; One end of the insulating cylinder is hermetically connected to the other end of the base, and the other end of the insulating cylinder is hermetically connected to the support member. The insulating cylinder, the other end of the base, and the support member form the thermal expansion chamber; The partition is the part of the base that separates the auxiliary gas chamber and the thermal expansion chamber.

10. A circuit breaker, characterized in that, It includes the one-way valve structure according to any one of claims 1-9.

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