Novel axial flow type stop valve

Abstract

The utility model relates to a novel axial flow type stop valve which comprises a valve body and a valve rod assembly installed on the valve body, a feeding cavity and a discharging cavity are formed in the valve body, a valve seat is arranged between the feeding cavity and the discharging cavity, the valve rod assembly comprises a valve element, the lower end face of the valve element is a spherical surface, and the valve seat comprises a movable valve seat body and a fixed valve seat body. The fixed valve seat is fixedly arranged in the valve body, a sealing mechanism is arranged between the movable valve seat and the fixed valve seat, an arc face used for being attached to the lower end face of the valve element is arranged on the inner side wall of the movable valve seat, an elastic abutting piece used for pushing the movable valve seat upwards is arranged between the movable valve seat and the fixed valve seat, and a first spring is arranged between the movable valve seat and the valve body. One end of the first spring is fixedly arranged at the bottom of the valve body, and the other end of the first spring is universally hinged to the movable valve seat, through the structure, when the position of the valve rod deviates within a certain range, the movable valve seat can be attached to the surface of the valve element in cooperation with swinging of the valve rod, and remedial measures can be temporarily taken for the deviation phenomenon of the valve rod.

Description

Technical Field

[0001] The utility model relates to the technical field of cut-off valves, in particular to a novel axial flow cut-off valve. Background Art

[0002] The axial flow cut-off valve realizes the opening and closing of the valve by driving the valve core to move up and down. However, at present, the valve seat of the existing axial flow cut-off valve is generally fixedly connected to the valve body, which leads to the problem that if the valve stem is inclined during long-term use, the valve core and the valve seat cannot be aligned, and the cut-off valve is prone to leakage. Summary of the Utility Model

[0003] The utility model provides a novel axial flow cut-off valve, which solves the above problems existing in the prior art during use.

[0004] The technical solution of the utility model is realized as follows: A novel axial flow cut-off valve includes a valve body and a valve stem assembly installed on the valve body. An inlet chamber and an outlet chamber are provided in the valve body. A valve seat is arranged between the inlet chamber and the outlet chamber. The valve stem assembly includes a valve core. The lower end face of the valve core is spherical. The valve seat includes a movable valve seat and a fixed valve seat. The fixed valve seat is fixedly arranged in the valve body. A sealing mechanism is arranged between the movable valve seat and the fixed valve seat. An arc surface for fitting with the lower end face of the valve core is arranged on the inner side wall of the movable valve seat. An elastic abutting member for pushing the movable valve seat upward is arranged between the movable valve seat and the fixed valve seat. A first spring is arranged between the movable valve seat and the valve body. One end of the first spring is fixedly arranged at the bottom of the valve body and the other end is universally hinged with the movable valve seat.

[0005] The utility model is further arranged as: The elastic abutting member is a second spring. A plurality of second springs are arranged and distributed circumferentially between the movable valve seat and the fixed valve seat.

[0006] The utility model is further arranged as: A connecting frame is connected to the lower end of the movable valve seat. The upper end of the first spring is fixedly connected with a connecting rod. The connecting frame is in a "U" shape. Both ends of the connecting frame are rotatably connected to the valve seat. The middle part of the connecting frame is rotatably connected to the connecting rod. Two connecting frames are provided. The connecting frames are respectively used to connect the left and right ends and the front and back ends of the movable valve seat.

[0007] The utility model is further arranged as: The connecting frame is a symmetric structure.

[0008] The utility model is further arranged as: The upper and lower ends of the second spring are respectively fixedly connected to the movable valve seat and the fixed valve seat.

[0009] The utility model is further configured as follows: the sealing mechanism comprises a bellows arranged between the movable valve seat and the fixed valve seat, and the upper and lower ends of the bellows are sealedly connected to the movable valve seat and the fixed valve seat.

[0010] The utility model is further configured as follows: a flexible sealing pad is arranged on the arc surface of the movable valve seat.

[0011] In summary, the beneficial effects of the present invention are:

[0012] 1. Through this structure, when the position of the valve stem deviates within a certain range, the movable valve seat can fit onto the surface of the valve core in coordination with the swing of the valve stem, which can temporarily remedy the valve stem deviation phenomenon.

[0013] 2. The bellows can make the fluid in the feed chamber flow to the discharge chamber only from the opening of the moving valve seat.

[0014] 3. The flexible sealing gasket can be used to further improve the sealing effect. When scratches and wear appear on the surface of the valve core, the flexible sealing gasket can be squeezed to the damaged part under the action of the second spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram showing the partial structure of the utility model;

[0018] Figure 3 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0019] Reference numerals in the figure: 1 valve body, 11 feed chamber, 12 discharge chamber, 131 movable valve seat, 132 fixed valve seat, 14 valve core, 22 first spring, 23 second spring, 24 connecting frame, 25 connecting rod, 26 bellows, 27 flexible sealing pad. DETAILED DESCRIPTION

[0020] The following will be combined with the attached embodiment of the present utility model Figure 1-3, clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example:

[0022] like Figures 1 to 3 As shown, the utility model discloses a novel axial flow cut-off valve, comprising a valve body 1 and a valve stem assembly mounted on the valve body 1, wherein a feed chamber 11 and a discharge chamber 12 are provided in the valve body 1, and a valve seat is provided between the feed chamber 11 and the discharge chamber 12, and this part of the structure is the prior art, and the modifications made by the utility model to the prior art are as follows:

[0023] The valve stem assembly includes a valve core 14, the lower end surface of which is a spherical surface. At the same time, the valve seat includes a movable valve seat 131 and a fixed valve seat 132, wherein the fixed valve seat 132 is fixedly arranged in the valve body 1, the movable valve seat 131 is movably arranged above the fixed valve seat 132, and the inner side wall of the movable valve seat 131 is provided with an arc surface for fitting with the lower end surface of the valve core 14. In addition, a first spring 22 is further provided between the movable valve seat 131 and the valve body 1, one end of the first spring 22 is fixedly arranged at the bottom of the valve body 1, and the other end is It is universally hinged with the movable valve seat 131. In this structure, a sealing mechanism is provided between the movable valve seat 131 and the fixed valve seat 132, and an elastic supporting member for pushing the movable valve seat 131 upward is provided between the movable valve seat 131 and the fixed valve seat 132. The elastic supporting member is a second spring 23. A plurality of second springs 23 are provided and distributed circumferentially between the movable valve seat 131 and the fixed valve seat 132. The upper and lower ends of the second spring 23 are fixedly connected to the movable valve seat 131 and the fixed valve seat 132 respectively.

[0024] The working principle of this structure is as follows: the first spring 22 and the second spring 23 are both used to push the movable valve seat 131 upward so that the movable valve seat 131 can abut against the surface of the valve core 14, and because the structure that connects the movable valve seat 131, the fixed valve seat 132 and the valve body 1 allows the movable valve seat 131 to swing and does not restrict the movable valve seat 131 to use the axis of the fixed valve seat 132 as the swing center, so when the valve stem deviates, the movable valve seat 131 can adapt to the swing angle of the valve core 14 to abut against the lower end surface of the valve core 14.

[0025] The connection scheme between the movable valve seat 131 and the first spring 22 is as follows: a connecting rod 25 is fixedly connected to the upper end of the first spring 22, and a "U"-shaped connecting frame 24 is connected to the lower end of the movable valve seat 131. Both ends of the connecting frame 24 are rotatably connected to the valve seat, and the middle part thereof is rotatably connected to the connecting rod 25. In this structure, the connecting frame 24 is a symmetric structure, that is, the lengths of the parts where both ends of the connecting frame 24 extend upward and are used for rotatable connection with the movable valve seat 131 are symmetric to each other. At the same time, two connecting frames 24 are provided, and these two connecting frames 24 are respectively used for connecting with the left and right ends and the front and rear ends of the movable valve seat 131.

[0026] With this structure, when one end of the movable valve seat 131 descends, the other end will correspondingly tilt up. This principle can make the movable valve seat 131 be in contact with the lower end surface of the valve core 14. And two connecting frames 24 are provided, which can enable the movable valve seat 131 to flexibly adjust the swing in four directions of front, back, left and right.

[0027] The sealing mechanism specifically includes a corrugated pipe 26 arranged between the movable valve seat 131 and the fixed valve seat 132. Both the upper and lower ends of the corrugated pipe 26 are hermetically connected to the movable valve seat 131 and the fixed valve seat 132. The advantage of this structure is that when the position of the movable valve seat 131 changes, the contact points of the corrugated pipe 26 with the movable valve seat 131 and the fixed valve seat 132 will not change, so a good sealing effect can be formed.

[0028] A flexible sealing pad 27 is arranged on the arc surface of the movable valve seat 131.

[0029] At the same time, it should be noted that the terms used in the present invention, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the protection scope of the present invention.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel axial flow cut-off valve, comprising a valve body (1) and a valve stem assembly mounted on the valve body (1), wherein a feed cavity (11) and a discharge cavity (12) are provided in the valve body (1), and a valve seat is provided between the feed cavity (11) and the discharge cavity (12), and characterized in that: The valve stem assembly includes a valve core (14), the lower end face of the valve core (14) is spherical, the valve seat includes a movable valve seat (131) and a fixed valve seat (132), the fixed valve seat (132) is fixedly arranged in the valve body (1), a sealing mechanism is arranged between the movable valve seat (131) and the fixed valve seat (132), an arc surface for fitting with the lower end face of the valve core (14) is arranged on the inner side wall of the movable valve seat (131), an elastic abutting member for pushing the movable valve seat (131) upward is arranged between the movable valve seat (131) and the fixed valve seat (132), a first spring (22) is arranged between the movable valve seat (131) and the valve body (1), one end of the first spring (22) is fixedly arranged at the bottom of the valve body (1) and the other end is universally hinged with the movable valve seat (131).

2. A novel axial flow cut-off valve according to claim 1, characterized in that: The elastic abutting member is a second spring (23), and a plurality of the second springs (23) are arranged and distributed circumferentially between the movable valve seat (131) and the fixed valve seat (132).

3. A novel axial flow cut-off valve according to claim 2, characterized in that: A connecting frame (24) is connected to the lower end of the movable valve seat (131), the upper end of the first spring (22) is fixedly connected with a connecting rod (25), the connecting frame (24) is in a "U" shape, both ends of the connecting frame (24) are rotatably connected to the valve seat, the middle part of the connecting frame (24) is rotatably connected to the connecting rod (25), two connecting frames (24) are provided, and the connecting frames (24) are respectively used for connecting the left and right ends and the front and back ends of the movable valve seat (131).

4. A novel axial flow cut-off valve according to claim 3, characterized in that: The connecting frame (24) is a symmetric structure.

5. A novel axial flow cut-off valve according to claim 2, characterized in that: The upper and lower ends of the second spring (23) are respectively fixedly connected with the movable valve seat (131) and the fixed valve seat (132).

6. A novel axial flow cut-off valve according to claim 1, characterized in that: The sealing mechanism includes a corrugated pipe (26) arranged between the movable valve seat (131) and the fixed valve seat (132), and both the upper and lower ends of the corrugated pipe (26) are hermetically connected with the movable valve seat (131) and the fixed valve seat (132).

7. A novel axial flow cut-off valve according to claim 1, characterized in that: A flexible sealing pad (27) is arranged on the arc surface of the movable valve seat (131).

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