CN100498024C - Mixing delivery over-flow valve double seal pair - Google Patents

Abstract

The invention provides a double sealing pair of a mixed transmission overflow valve, which includes upper and lower sealing pairs arranged oppositely. There is a flange with a knife-edge cross-section. The upper sealing pair includes a sealing ring, a ferrule and a sealing ring. The sealing ring is fixed on the lower end surface of the valve core through the fixing block, and the sealing ring is embedded in the upper ring groove of the fixing block; The ring is embedded in the lower ring groove of the lower end surface of the valve core through the ferrule and the fixed ring. The ferrule is located on the outer circumference of the sealing ring, and the fixed ring is located on the inner circumference of the sealing ring; the lower end of the outer circumference of the sealing ring is also equipped with an inverted cone surface; At this time, the outer peripheral surface of the sealing ring and the inner peripheral surface of the lower sealing pair are in clearance fit, and the flange of the lower sealing pair abuts against the lower end surface of the ferrule. The valve of the invention has high sealing performance, stability and safety, simple structure and wide application range.

Description

Mixed transmission relief valve double seal pair

technical field

The invention relates to an auxiliary component of a mixed transmission relief valve, in particular to a double sealing pair of a mixed transmission relief valve.

Background technique

For the multi-phase mixed transportation conditions of various fluid media with high pressure, large flow and large viscosity range, the traditional sealing pair cannot guarantee the sealing, stability and safety of the valve, and will cause equipment vibration. In order to ensure that the mixed transmission relief valve can achieve the required pressure stabilization accuracy and work stability under the design pressure, flow rate and medium viscosity range, so as to improve the production efficiency and safety performance of the mixed transmission system, it is necessary to design a high-performance sealing pair .

Contents of the invention

The purpose of this invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and to provide a double-sealed pair of a mixed delivery overflow valve with good sealing performance, stability and safety.

The object of the present invention is achieved through the following technical solutions: the double sealing pair of the mixed transmission overflow valve includes upper and lower sealing pairs arranged oppositely, the upper sealing pair is arranged at the lower end of the valve core, and the lower sealing pair is fixedly installed on the valve body. The lower sealing pair is provided with a flange along the upper end of the inner circumference, which is cut into a knife-edge shape. The upper sealing pair includes a sealing ring, a ferrule, and a sealing ring. The sealing ring is fixed on the lower end surface of the valve core through a fixing block, and the sealing ring Embedded in the upper ring groove of the fixed block; the sealing ring is embedded in the lower ring groove of the lower end surface of the valve core through the ferrule and the fixed ring. The lower end of the outer periphery of the sealing ring is also provided with an inverted cone surface; when the valve is closed, the outer peripheral surface of the sealing ring and the inner peripheral surface of the lower sealing pair are in clearance fit, and the flange of the lower sealing pair is in contact with the lower end surface of the ferrule .

In order to better realize the present invention, the upper end of the inner circumference of the sealing ring is provided with a horizontal flange, the cross section of the sealing ring is """ shaped, and the upper end of the outer circumference of the fixing ring is correspondingly provided with a step structure and the inner peripheral surface of the horizontal flange. , The lower end surface fits together, and there is a gap between the inner peripheral surface of the sealing ring and the outer peripheral surface of the fixed ring. The medium can form pressure here;

The outer peripheral surface of the sealing ring must not have any contact with the inner peripheral surface of the lower sealing pair, but the gap is very small, and the amount of the gap depends on the specifications and sizes of the double sealing pair of the mixed transmission overflow valve.

The working principle of the present invention is: (1) when the valve is in the closed state, the flange of the lower sealing pair abuts against the lower end surface of the upper sealing pair ferrule, and plays the role of bearing axial force; (2) the upper sealing pair There is a certain gap between the outer peripheral surface of the sealing ring and the inner peripheral surface of the lower sealing pair, and there is also a certain gap between the inner peripheral surface of the sealing ring of the upper sealing pair and the outer peripheral surface of the fixed ring. When the upper sealing pair seal ring does not work, the fluid enters the gap between the inner peripheral surface of the upper sealing pair sealing ring and the outer peripheral surface of the fixed ring, and under the action of fluid pressure, the lower end of the lower sealing pair The inverted cone surface fits with the flange of the lower sealing pair, so that the sealing ring of the lower sealing pair can achieve self-tight sealing to ensure the sealing of the valve; The gap between it and the inner peripheral surface of the lower sealing pair plays a damping role to avoid hydraulic vibration of the valve.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1) The sealing, stability and safety of the valve are high;

(2) It can ensure that the mixed-transport relief valve can achieve the required pressure stabilization accuracy and work stability within the design pressure and flow range under the mixed-transport working condition of multi-phase flow, so as to improve the production efficiency and stability of the mixed-transport system. Safety performance;

(3) It can be used in multi-phase mixed transportation conditions of various fluid media with large pressure, large flow and large viscosity range. It is a special component with simple, wide application range and good practical effect. It is used in related valves in general chemical processes. can also be applied in .

Description of drawings

Fig. 1 is a structural schematic diagram of the closed state of the double seal pairs of the mixed transmission overflow valve of the present invention;

Fig. 2 is a structural schematic diagram of the double-seal pairs of the mixed transmission overflow valve of the present invention in an open state.

Detailed ways

The present invention will be described in further detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

Embodiment one

As shown in Figures 1 and 2, the double sealing pair of the mixed transmission relief valve includes an upper sealing pair and a lower sealing pair 1, the upper sealing pair is arranged at the lower end of the valve core, and the lower sealing pair 1 is fixedly installed on the valve body 5 The upper and lower sealing pairs 1 are provided with a flange along the upper end of the inner circumference, and its cross-section is knife-edge shaped. The upper sealing pair includes a sealing ring 2, a ferrule 3, and a sealing ring 4. The sealing ring 2 is fixed under the valve core 6 through a fixing block 7. On the end face, the sealing ring 2 is embedded in the upper ring groove 7-1 of the fixed block 7; the sealing ring 4 is embedded in the lower ring groove 6-1 of the lower end surface of the valve core 6 through the ferrule 3 and the fixed ring 8, and the ferrule 3 is located on the outer circumference of the sealing ring 4, and the fixed ring 8 is located on the inner circumference of the sealing ring 4. The upper end of the inner circumference of the sealing ring 4 is provided with a horizontal flange. The step structure fits the inner peripheral surface and the lower end surface of the horizontal flange, and there is a gap between the inner peripheral surface of the sealing ring 4 and the outer peripheral surface of the fixed ring 8; the outer peripheral lower end of the sealing ring 4 is also provided with an inverted cone surface. When the valve is closed, the outer peripheral surface of the sealing ring 2 is in clearance fit with the inner peripheral surface of the lower sealing pair 1;

The outer peripheral surface of the sealing ring 2 must not have any contact with the inner peripheral surface of the lower sealing pair 1, but the gap is very small, and the amount of the gap varies depending on the size of the double sealing pair of the mixed transmission overflow valve. The gap between the inner peripheral surface of the sealing ring 4 and the outer peripheral surface of the fixed ring 8 depends on the specification and size of the double sealing pair of the mixed delivery overflow valve, and the size of the gap depends on the pressure that the medium can form here.

The double sealing pair of the mixed transmission overflow valve works as follows: (1) When the valve is in the closed state, the flange of the lower sealing pair 1 is in contact with the lower end surface of the upper sealing pair ferrule 3 to carry axial force (2) There is a certain gap between the outer peripheral surface of the upper sealing pair sealing ring 2 and the inner peripheral surface of the lower sealing pair 1, and there is a gap between the inner peripheral surface of the upper sealing pair sealing ring 4 and the outer peripheral surface of the fixed ring 8 There is also a certain gap. When the valve core is in the closed state, the upper sealing secondary sealing ring 2 does not work, and the fluid enters the gap between the inner peripheral surface of the upper sealing secondary sealing ring 4 and the outer peripheral surface of the fixed ring 8. Under the action of fluid pressure, the inverted cone surface at the lower end of the lower sealing ring 4 of the lower sealing pair fits with the flange of the lower sealing pair 1, so that the sealing ring 4 of the lower sealing pair realizes self-tight sealing and ensures the sealing of the valve; (4) When the valve core is in the open state with a small flow rate, the gap between the outer peripheral surface of the upper sealing pair sealing ring 2 and the inner peripheral surface of the lower sealing pair 1 plays a damping role to avoid hydraulic vibration of the valve.

As described above, the present invention can be preferably carried out.

Claims (2)

1. Double sealing pair of mixed transmission overflow valve, including upper and lower sealing pairs set opposite to each other, the upper sealing pair is located at the lower end of the valve core, and the lower sealing pair is fixedly installed on the valve body. It is characterized in that: the lower sealing pair is There is a flange on the upper end of the inner circumference, and its section is knife-edge shaped. The upper sealing pair includes a sealing ring, a ferrule, and a sealing ring. In the ring groove; the sealing ring is embedded in the lower ring groove of the lower end surface of the valve core through the ferrule and the fixed ring. There is also an inverted conical surface; when the valve is closed, the outer peripheral surface of the sealing ring is in clearance fit with the inner peripheral surface of the lower sealing pair, and the flange of the lower sealing pair abuts against the lower end surface of the ferrule. 2. According to claim 1, the double sealing pair of the mixed transmission overflow valve is characterized in that: the upper end of the inner circumference of the sealing ring is provided with a horizontal flange, the cross section of the sealing ring is in the shape of "『", and the upper end of the outer circumference of the fixed ring is correspondingly set A stepped structure fits the inner peripheral surface and the lower end surface of the horizontal flange, and there is a gap between the inner peripheral surface of the sealing ring and the outer peripheral surface of the fixed ring.

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