Sealing structure for check valve

Abstract

The sealing structure for the check valve comprises a valve seat, a sealing pressing ring and a valve clack matched with the sealing pressing ring, a containing groove is formed in the inner circle step face of the valve seat, a spring is arranged in the containing groove, the other end of the spring abuts against a movable pressing ring, and the movable pressing ring is installed in a pressing ring buffering chamber in a sliding mode. A pressing ring check ring is arranged on the outer circumference of the movable pressing ring, the pressing ring check ring is fixedly installed on the inner end face of the valve seat through a fastener, and a sealing ring is arranged on the matching face of the movable pressing ring and the valve clack. According to the sealing structure for the check valve, the sealing performance of the check valve is remarkably improved, and the service life of the check valve is remarkably prolonged through the technical characteristics that the innovative spring-movable pressing ring combined design is adopted, the pressing ring check ring is fixed to the fastener, the limiting ring is matched with the limiting step, the multiple containing grooves are distributed, and the sealing groove is matched with the sealing ring. When the valve is closed, the spring releases energy to push the movable pressing ring to be tightly attached to the valve clack to form effective sealing.

Description

TECHNICAL FIELD

[0001] The utility model belongs to check valve technical field, especially relate to a sealing structure for swing check valve. BACKGROUND

[0002] In the fluid control system, check valve as an important automatic valve, is widely used in various need to prevent the medium backflow occasion. Among them, swing check valve because its simple structure, convenient operation and is popular. However, in the actual application process, swing check valve also exposed some technical deficiencies, especially the valve leakage problem, this becomes the key factor restricting its performance further promotion.

[0003] The working principle of swing check valve mainly relies on the self-weight of the valve disc and the medium pressure to realize the opening and closing of the valve. When the medium flow direction is consistent with the valve disc opening direction, the valve disc is pushed away, and the medium is allowed to pass through. When the medium flow direction is reversed, the valve disc is tightly attached to the valve seat by self-weight and medium counter pressure, thereby blocking the medium backflow. However, in the actual working condition, due to the instability of fluid pressure, the wear between valve disc and valve seat, and the design defects of sealing structure and other factors, often lead to swing check valve cannot form effective sealing when closing, and further produce leakage.

[0004] Especially the traditional swing check valve, its sealing structure is usually relatively simple, lacks the necessary buffer and compensation mechanism. In the moment of valve closing, the impact force between valve disc and valve seat is large, which is easy to cause damage and deformation of sealing surface, thereby affecting the sealing effect. In addition, due to the unreasonable selection of sealing material and the design of sealing structure, it is also easy to cause aging, wear and fall off of the sealing ring, further aggravate the leakage problem of the valve.

[0005] Therefore, in view of the technical problems of unstable sealing performance and easy leakage of existing swing check valve, a new type of sealing structure for check valve is needed to improve the sealing effect and service life of the valve. CONTENT OF THE UTILITY MODEL

[0006] In view of the problems existing in the prior art, the utility model provides a sealing structure for swing check valve, which solves the technical problems of unstable sealing performance and easy leakage of existing check valve.

[0007] The utility model discloses a sealing structure for check valve, which is characterized in that an inner circular step surface of the valve seat is provided with a placing groove, a spring is arranged in the placing groove, and the other end of the spring abuts against a movable compression ring, the movable compression ring is slidably installed in a compression ring buffer chamber, an outer circumference of the movable compression ring is provided with a compression ring stop ring, the compression ring stop ring is fixedly installed on an inner end surface of the valve seat through a fastener, and a sealing ring is arranged on a cooperation surface between the movable compression ring and the valve disc.

[0008] Preferably, the outer circumference of the movable compression ring is provided with a limiting ring, and the inner circumference of the compression ring stop ring corresponding to the limiting ring is provided with a limiting step.

[0009] Preferably, N placing grooves are arranged in the circumferential direction, wherein N is a natural number greater than or equal to 3.

[0010] Preferably, a sealing groove is arranged on the valve disc at the side of the movable compression ring, and a sealing ring is embedded in the sealing groove.

[0011] The utility model discloses a sealing structure for check valve, which is characterized in that an inner circular step surface of the valve seat is provided with a placing groove, a spring is arranged in the placing groove, and the other end of the spring abuts against a movable compression ring, the movable compression ring is slidably installed in a compression ring buffer chamber, an outer circumference of the movable compression ring is provided with a compression ring stop ring, the compression ring stop ring is fixedly installed on an inner end surface of the valve seat through a fastener, and a sealing ring is arranged on a cooperation surface between the movable compression ring and the valve disc. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of the utility model;

[0013] Figure 2 is Figure 1 an enlarged view of part I.

[0014] In the figure: 1, valve seat; 2, placing groove; 3, valve disc; 4, spring; 5, movable compression ring; 6, compression ring buffer chamber; 7, compression ring stop ring; 8, fastener; 9, sealing ring. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the utility model.

[0016] Please refer to Figure 1 and Figure 2A sealing structure for check valve, comprising a valve seat 1, a sealing compression ring and a valve disc 3 cooperating with the sealing compression ring, a placing groove 2 is arranged on the inner circular stepped surface of the valve seat, a spring 4 is arranged in the placing groove, the placing groove provides a stable mounting position for the spring, ensures that the spring can maintain the correct direction during compression and release, thereby effectively pushing the movable compression ring 5 to move, the other end of the spring abuts against the movable compression ring 5, the movable compression ring is slidingly installed in the compression ring buffer chamber 6, the compression and release of the spring provide power for the movement of the movable compression ring, so that the movable compression ring can be self-adaptively adjusted according to the opening and closing state of the valve disc, and the sealing effect is ensured, the outer circumference of the movable compression ring is provided with a compression ring stop ring 7, the compression ring stop ring is fixedly installed on the inner end surface of the valve seat 1 through fasteners 8, the compression ring stop ring is fixed on the valve seat through fasteners, and reliable support and limiting of the movable compression ring are provided, so that the movable compression ring can not deviate from the predetermined track during movement, and a sealing ring 9 is arranged on the cooperation surface of the movable compression ring and the valve disc.

[0017] Preferably, the outer circumference of the movable compression ring 5 is provided with a limiting ring, and the inner circumference of the compression ring stop ring is provided with a limiting step corresponding to the limiting ring, when the movable compression ring moves to a certain position, the limiting ring will contact the limiting step, thereby preventing the movable compression ring from continuing to move, and the stability and reliability of the sealing structure are ensured.

[0018] Preferably, a plurality of placing grooves are arranged in the circumferential direction, wherein N is a natural number greater than or equal to 3, and the number of placing grooves in the embodiment is 4, the design of the plurality of placing grooves enables the spring and the movable compression ring to be more uniformly distributed on the valve seat, and the uniformity and stability of the sealing are improved.

[0019] Preferably, a sealing groove is arranged on the valve disc 3 on the side of the movable compression ring, and the sealing ring 9 is embedded in the sealing groove.

[0020] The working principle of the utility model is as follows: when the fluid is in a static or forward flow state, the sealing structure for check valve of the utility model keeps opening or stable state.

[0021] When the fluid flows reversely, the valve disc starts to fall due to gravity or fluid pressure, and pushes the movable compression ring to slide in the compression ring buffer chamber, in this process, the spring is compressed, absorbs the impact energy when the valve disc falls, plays a buffering role, and reduces the damage of the sealing surface, at the same time, the movable compression ring keeps a stable movement track under the constraint of the limiting ring and the limiting step, and the uniformity of the sealing is ensured.

[0022] When the valve disc is completely closed, the spring releases energy again, tightly presses the movable compression ring on the valve disc, the sealing ring is further compressed, and a more tight sealing effect is formed. At this time, even if the fluid pressure fluctuates, due to the elasticity of the spring and the sliding design of the movable compression ring, the sealing structure can maintain stable sealing effect, effectively prevent fluid backflow and leakage. In the whole process, the sealing structure of the utility model realizes self-adaptive adjustment to the fluid state through the elastic force of the spring, the sliding design of the movable compression ring and the compression effect of the sealing ring, and ensures the sealing performance and service life of the check valve.

[0023] The above merely describes the preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A seal structure for a check valve comprising a valve seat, a seal ring and a valve disc cooperating with the seal ring, characterized in that, The inner circular step surface of the valve seat is provided with a placing groove, the placing groove is provided with a spring, the other end of the spring abuts against a movable compression ring, the movable compression ring is slidingly installed in a compression ring buffer chamber, the outer circumference of the movable compression ring is provided with a compression ring retainer, the compression ring retainer is fixedly installed on the inner end surface of the valve seat through fasteners, and a sealing ring is arranged on the cooperation surface of the movable compression ring and the valve disc.

2. The seal structure for a check valve according to claim 1, characterized by: The outer circumference of the movable compression ring is provided with a limiting ring, and the inner circumference of the compression ring retainer is provided with a limiting step corresponding to the limiting ring.

3. The seal structure for a check valve according to claim 1, characterized by: N placing grooves are arranged in the circumferential direction, wherein N is a natural number greater than or equal to 3.

4. The seal structure for a check valve according to claim 1, characterized by: A sealing groove is arranged on the valve disc on the side of the movable compression ring, and a sealing ring is embedded in the sealing groove.

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