A valve ball assembly structure of an upper-mounted high-temperature steam ball valve

Abstract

This utility model discloses a valve ball assembly structure for a top-mounted high-temperature steam ball valve, including a valve ball body with a complete straight-hole flow channel, a split-type connecting assembly, a gap-eliminating fit structure, an axial fastening unit, a torque transmission unit, and a valve shaft. The split-type connecting assembly includes two detachable connecting discs, which respectively mate with the axial end faces of the valve ball body. The gap-eliminating fit structure is located at the contact interface between the connecting disc and the valve ball body to eliminate assembly gaps. The axial fastening unit passes through the connecting disc and the valve ball body to achieve axial locking. The torque transmission unit passes through the connecting disc and the valve ball body to achieve opening and closing torque transmission. The valve shaft mates with one of the connecting discs for the driven rotation of the valve ball body. In this structure, the upper and lower connecting discs and the valve ball, as well as the lower connecting disc and the valve shaft, all adopt conical surface mating to eliminate assembly gaps, ensuring the coaxiality of the valve ball assembly and improving structural performance.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, specifically to a valve ball assembly structure for an upper-mounted high-temperature steam ball valve. Background Technology

[0002] For high-temperature steam ball valves, the seal between the valve seat and the valve body generally does not use O-rings or other sealing components, but can use a metal diaphragm seal structure. The valve seat assembly of the metal diaphragm seal structure has a limited deflection stroke in the valve flow direction. The "draft distance" between the valve seat and the valve ball (i.e., the engagement depth between the valve seat end face and the valve ball opening in the flow direction) is usually much greater than the deflection stroke of the metal diaphragm structure. Therefore, when assembling the valve ball in a top-entry high-temperature steam ball valve, even with a corresponding valve seat push-opening device, it is difficult to completely push the valve seat open to assemble the valve ball.

[0003] Therefore, the valve ball of a top-loading high-temperature steam ball valve can usually adopt a split structure to achieve valve ball assembly. Currently, the commonly used split valve ball assembly usually adopts a structure of "cutting off part of the solid material of the valve ball from top to bottom, and then designing a matching valve core to pass through it" (see Figure 1 This structure, due to the removal of a portion of the solid material from the valve ball from top to bottom, results in an irregular straight-hole structure for the valve ball's flow channel and a thin-walled structure in the valve ball itself. Simultaneously, the valve core, which mates with the valve ball, also has a thin-walled structure. The irregularly shaped flow channel of the valve ball, along with the thin-walled valve core, makes them prone to deformation under high temperature and pressure conditions, thus affecting the structural stability of the valve ball assembly. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a valve ball assembly structure for a top-mounted high-temperature steam ball valve.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A valve ball assembly structure for a top-mounted high-temperature steam ball valve, comprising:

[0006] A valve ball body with a complete straight-hole flow channel;

[0007] The split connection assembly includes two detachable connection discs, which respectively mate with the axial end face of the valve ball body;

[0008] A clearance-eliminating fit structure is located at the contact interface between the connecting disc and the valve ball body to eliminate assembly clearances.

[0009] An axial fastening unit extends through the connecting disc and the valve ball body to achieve axial locking;

[0010] The torque transmission unit runs through the connecting disc and the valve ball body to realize the transmission of opening and closing torque;

[0011] The valve shaft driven unit, in conjunction with one of the connecting discs, is used for the driven rotation of the valve ball body.

[0012] Furthermore, the split-type connection assembly includes an upper connection plate and a lower connection plate, with the upper connection plate located at the upper end of the valve ball body and the lower connection plate located at the lower end of the valve ball body.

[0013] Furthermore, the clearance elimination fit structure is a conical surface fit pair, including a first conical surface at the end of the valve ball body and a second conical surface on the connecting plate, the first conical surface and the second conical surface fit together.

[0014] Furthermore, the axial fastening unit includes bolts and elastic washers. The bolts pass through the axial through hole of the connecting plate and the threaded hole of the valve ball body in sequence to fasten the two, and the elastic washers prevent loosening.

[0015] Furthermore, the torque transmission unit includes a locating pin that passes through both the connecting disc and the locking hole of the valve ball body.

[0016] Furthermore, the valve shaft driven unit includes a valve shaft that mates with the tapered surface of the lower connecting plate, a lock nut that is threaded to the end of the inner hole of the lower connecting plate, and an elastic retaining ring that is locked in the groove of the inner hole of the lower connecting plate. The elastic retaining ring is used to restrict the axial movement of the lock nut.

[0017] The present invention has the following beneficial effects: The valve ball assembly structure of the top-mounted high-temperature steam ball valve provided by the present invention is as follows:

[0018] (1) This structure neither destroys the original regular straight hole structure of the valve ball flow channel nor contains any thin-walled components, thus ensuring the performance of the valve ball assembly under high temperature and high pressure.

[0019] (2) This structure reduces the processing difficulty and cost of the valve ball assembly;

[0020] (3) The upper and lower connecting discs and the valve ball, and the lower connecting disc and the valve shaft in this structure are all fitted with conical surfaces to eliminate assembly gaps and ensure the coaxiality of the valve ball assembly. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a split-type valve ball assembly in the prior art;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model;

[0023] Figure 3 This is an assembly flowchart of the present invention;

[0024] Figures 1 to 3The reference numerals in the attached drawings are respectively: 1-valve ball body, 2-upper connecting plate, 3-lower connecting plate, 4-first conical surface, 5-second conical surface, 6-bolt, 7-elastic washer, 8-locating pin, 9-valve shaft, 10-locking nut, 11-elastic retaining ring. Detailed Implementation

[0025] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0026] like Figure 2 As shown, a valve ball assembly structure for an upper-mounted high-temperature steam ball valve includes a valve ball body 1 with a complete straight-hole flow channel, a split-type connecting assembly, a clearance-eliminating fit structure, an axial fastening unit, a torque transmission unit, and a valve shaft driven unit.

[0027] The split-type connecting assembly includes two detachable connecting discs, which respectively mate with the axial end faces of the valve ball body 1. In this embodiment, preferably, the split-type connecting assembly includes an upper connecting disc 2 and a lower connecting disc 3. The upper connecting disc 2 is located at the upper end of the valve ball body 1, and the lower connecting disc 3 is located at the lower end of the valve ball body 1. The upper connecting disc 2 is detachably connected to the valve ball body 1. This detachable design allows the valve ball body 1 to be independently placed into the valve cavity first during assembly, and then the connecting disc is installed, solving the installation interference problem caused by insufficient valve seat opening stroke in traditional structures. The lower connecting disc 3 mates with the valve shaft 9 through a conical surface, forming a self-centering driven interface to ensure that the valve ball rotation axis coincides with the driven axis.

[0028] In this embodiment, a gap-eliminating fit structure is provided at the contact interface between the connecting plate and the valve ball body 1 to eliminate assembly gaps. Preferably, the gap-eliminating fit structure is a conical surface fit pair, including a first conical surface 4 at the end of the valve ball body 1 and a second conical surface 5 on the connecting plate. Specifically, the upper connecting plate 2 and the lower connecting plate 3 are respectively provided with the second conical surface 5, and the upper end and the lower end of the valve ball body 1 are respectively provided with the first conical surface 4. The first conical surface 4 and the second conical surface 5 fit together. The first conical surface 4 at the end of the valve ball body 1 fits with the second conical surface 5 of the connecting plate, automatically correcting the coaxiality of the valve ball and the valve body during assembly and eliminating assembly gaps.

[0029] In this embodiment, the axial fastening unit penetrates both the connecting disc and the valve ball body 1 to achieve axial locking. Preferably, the axial fastening unit includes a bolt 6 and an elastic washer 7. The bolt 6 passes sequentially through the axial through hole of the connecting disc and the threaded hole of the valve ball body 1, and is prevented from loosening by the elastic washer 7. The bolt 6 provides axial preload, and the elastic washer 7 uses elastic deformation to continuously compensate for the loosening displacement of the bolt 6, thereby improving the locking effect.

[0030] In this embodiment, the torque transmission unit penetrates both the connecting disc and the valve ball body 1 to achieve the transmission of opening and closing torque. Preferably, the torque transmission unit includes a positioning pin 8, which penetrates both the connecting disc and the locking hole of the valve ball body 1. Multiple positioning pins 8, such as 4-6 evenly distributed circumferentially, can be used to improve the locking effect. The positioning pins 8, in conjunction with the locking hole, enable a detachable connection between the connecting disc and the valve ball body 1.

[0031] In this embodiment, the valve shaft driven unit cooperates with one of the connecting discs for the driven rotation of the valve ball body 1. Preferably, the valve shaft driven unit includes a valve shaft 9 that cooperates with the conical surface of the lower connecting disc 3, a locking nut 10 that is threaded to the end of the inner hole of the lower connecting disc 3, and an elastic retaining ring 11 that is locked in the groove of the inner hole of the lower connecting disc 3. The elastic retaining ring 11 is used to restrict the axial movement of the locking nut 10.

[0032] In this application, the upper connecting plate 2 and the valve ball body 1, as well as the lower connecting plate 3 and the valve ball body 1, both employ a conical surface fit to eliminate assembly clearance. Bolts 6 and elastic washers 7 are then used for fastening. Finally, a locating pin 8 is used to transmit the torque of the valve ball assembly during opening and closing within the valve cavity. The valve shaft 9 and the lower connecting plate 3 also employ a conical surface fit, which is then locked in place with a lock nut 10. Finally, an elastic retaining ring 11 secures the lock nut 10 within the inner hole of the lower connecting plate 3.

[0033] like Figure 3 As shown, after all components except the valve ball assembly are installed in the valve cavity, first, place the valve ball body 1 into the valve cavity as shown in Figure a) (the height of the upper and lower end faces of the valve ball is less than the distance between the two valve seats in the valve cavity); then, use a tapered screw to push the valve seat open a small distance to ensure that the valve ball body 1 can rotate freely in the valve cavity; then, after two rotations, obtain the state shown in Figure d); next, install the lower connecting plate 3, bolt 6, elastic washer 7, and locating pin 8; then, rotate the valve ball body 1 180° around the flow channel direction to obtain the state shown in Figure f); next, install the valve shaft 9, locking nut 10, and elastic retaining ring 11 as shown in Figure g); then, loosen the tapered screw as shown in h), and replace the sealing gasket and sealing screw; finally, assemble the connecting plate 2, bolt 6, elastic washer 7, and locating pin 8 as shown in i). This completes the assembly of the valve ball assembly.

[0034] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A valve ball assembly structure of an upper-mounted high-temperature steam ball valve, characterized by, include: A valve ball body with a complete straight-hole flow channel (1); The split connection assembly includes two detachable connection discs, which respectively cooperate with the axial end face of the valve ball body (1); A gap-eliminating fit structure is provided at the contact interface between the connecting disc and the valve ball body (1) to eliminate assembly gaps; An axial fastening unit extends through the connecting disc and the valve ball body (1) to achieve axial locking; A torque transmission unit extends through the connecting disc and the valve ball body (1) to realize the transmission of opening and closing torque; The valve shaft driven unit, in conjunction with one of the connecting discs, is used for the driven rotation of the valve ball body (1).

2. The valve ball assembly structure of the top-mounted high-temperature steam ball valve according to claim 1, characterized in that, The split connection assembly includes an upper connection plate (2) and a lower connection plate (3). The upper connection plate (2) is located at the upper end of the valve ball body (1), and the lower connection plate (3) is located at the lower end of the valve ball body (1).

3. The valve ball assembly structure of the top-mounted high-temperature steam ball valve according to claim 1, characterized in that, The gap elimination fit structure is a conical surface fit pair, including a first conical surface (4) at the end of the valve ball body (1) and a second conical surface (5) on the connecting plate, wherein the first conical surface (4) and the second conical surface (5) fit together.

4. The valve ball assembly structure of the top-mounted high-temperature steam ball valve according to claim 1, characterized in that, The axial fastening unit includes a bolt (6) and an elastic washer (7). The bolt (6) passes through the axial through hole of the connecting plate and the threaded hole of the valve ball body (1) in sequence to fasten the two, and the elastic washer (7) prevents loosening.

5. The valve ball assembly structure of the top-mounted high-temperature steam ball valve according to claim 1, characterized in that, The torque transmission unit includes a positioning pin (8), which passes through the locking hole of both the connecting disc and the valve ball body (1).

6. The upper-mounted high-temperature steam ball valve's valve ball assembly structure according to claim 1, characterized in that, The valve shaft driven unit includes a valve shaft (9) that mates with the tapered surface of the lower connecting plate (3), a locking nut (10) that is threaded to the end of the inner hole of the lower connecting plate (3), and an elastic retaining ring (11) that is locked in the inner hole groove of the lower connecting plate (3). The elastic retaining ring (11) is used to restrict the axial movement of the locking nut (10).

Images