CN203925605U - A kind of septum valve valve rod and crosshead connecting structure - Google Patents

Abstract

The utility model discloses an indirect connection structure of workpieces, in particular to a connection structure between a valve stem and a crosshead of a high-pressure regulating valve, belonging to the technical field of mechanical connection structure design; the connection structure between a valve stem and a crosshead of a high-pressure regulating valve includes a valve The stem and the crosshead, the valve stem is indirectly connected to the crosshead through the crosshead connection hole and the screw plug, lifting nut and backing ring arranged in the connection hole; the high pressure regulating valve valve stem of the utility model is indirectly connected to the crosshead The structure of the connection is ingenious in concept and reasonable in structure, which effectively overcomes the disadvantages of the straight threaded connection design between the valve stem and the cross head of the high-pressure regulating valve. The purpose of protecting the connecting thread between the valve stem and the cross head is achieved, and the stability of the high-pressure regulating valve is improved during the adjustment process. At the same time, the connecting structure of the utility model is also suitable for connecting other workpieces whose threads are subjected to impact force.

Description

A connection structure between valve stem and crosshead of high-pressure regulating valve

technical field

The utility model relates to an indirect connection structure of workpieces, in particular to a connection structure between a valve rod of a high-pressure regulating valve and a cross head, and belongs to the technical field of mechanical connection structure design.

Background technique

In power generation equipment, the valve stem of the high-pressure regulating valve of the unit is directly connected with the cross head in the control seat in the form of threads. After the unit is tested or operated for a period of time, after the gasket in the screw hole is deformed, the reaction at the moment the valve is closed The force is directly borne by the joint surface of the valve stem and the crosshead thread, causing the thread to deform, resulting in failure of the connection between the valve stem and the crosshead, often causing the valve to close without reason or the valve not closing properly during the load change process, and the load of the unit does not follow the opening of the valve. The change of the speed command seriously threatens the safe and stable operation of the unit. At the same time, it is difficult to disassemble the high-pressure regulating valve and the cross head of the valve control seat during the maintenance of the unit.

Contents of the invention

The purpose of the invention of the present utility model is to provide an indirect connection structure between the stem of the high-pressure regulating valve and the cross head in view of the above-mentioned problems, so that when the high-pressure regulating valve is closed quickly, the reaction force on the valve stem is directly transmitted to the crosshead. The top of the connecting hole of the cross head prevents the valve stem thread from bearing the impact force, and achieves the purpose of protecting the connection thread between the valve stem and the cross head.

The technical scheme that the utility model adopts is as follows:

A connection structure between a valve stem and a crosshead of a high-pressure regulating valve, including a valve stem and a crosshead, a connection hole is provided at the connection end of the crosshead, a lifting nut is set inside the connection hole, and a screw plug is provided at the port of the connection hole. The valve stem passes through the screw plug and is threaded and fixed with the lifting nut, and the end of the valve stem is tightened to the end face of the connecting hole through the backing ring, the outer end of the lifting nut is tightened to the screw plug, and the inner end of the lifting nut is connected to the connecting hole. A structure in which the end faces of the holes do not touch.

Due to the adoption of the above technical solution, the crosshead is provided with a connecting hole, and by setting a lifting nut in the connecting hole, in order to improve the convenience of assembly, the lifting nut can move along the axial direction of the hole in the connecting hole and cannot rotate in the hole , the screw plug is threadedly connected to the port position of the connecting hole, which is used for radial locking and fixing of the lifting nut and the valve stem, and realizes the indirect connection between the valve stem and the crosshead. Through this indirect connection, the reaction force at the moment of valve closing will not be directly borne by the thread joint surface to deform the thread. Even if there is a gap between the backing ring and the valve stem during operation, it will not damage the lifting nut and the valve stem. The thread between them avoids the unstable operation of the valve, and at the same time facilitates the disassembly and disassembly during the maintenance process.

In the connection structure between the valve stem and the crosshead of the high-pressure regulating valve of the utility model, the lifting nut and the connecting hole are both circular, and the lifting nut is arranged in the connecting hole with clearance fit, and the outer wall of the lifting nut is provided with a guide groove in the axial direction. The wall is provided with guide pins adapted to the guide grooves.

Due to the adoption of the above-mentioned technical scheme, the guide groove provided axially on the outer wall of the lifting nut, under the guiding action of the guide pin of the crosshead, ensures that the lifting nut does not rotate during assembly and operation, and provides a certain guiding effect. This structure effectively ensures the stability and maintainability of the high-pressure regulating valve. In the specific design, the connecting hole and lifting nut can also be designed as non-circular, such as: triangle or polygon, to avoid the connecting hole and lifting nut. The relative rotation between them, but the use of guide grooves and guide pins reduces the processing difficulty of the workpiece.

Further, the end surface of the crosshead is provided with a stop plate adapted to the valve stem.

The stop plate is welded on the crosshead.

Due to the adoption of the above technical scheme, the stop plate is fixedly arranged on the end face of the crosshead, and the stop plate is clamped on the non-circular clamping segment of the valve stem to prevent the mutual rotation between the valve stem and the crosshead and improve the cost. The utility model relates to the reliability of the connection structure between the stem and the crosshead of the high-pressure regulating valve in operation.

Further, the side wall of the crosshead is also provided with a set screw for locking the screw plug.

Due to the adoption of the above technical solution, the design of the set screw can prevent the screw plug from loosening during operation, thus improving the reliability of the operation of the structure.

Further, the gap between the lifting nut and the end surface of the connection hole is 2mm-4mm.

Due to the adoption of the above technical scheme, the gap between the lifting nut and the end face of the connecting hole is 2mm-4mm, which not only ensures a compact structural design, but also effectively provides a gap space for the lifting nut and the connecting hole, ensuring the effectiveness of the gap design. The gap is 3mm.

To sum up, due to the adoption of the above technical solution, the beneficial effect of the utility model is: the structure of the indirect connection between the valve rod of the high-pressure regulating valve and the crosshead has an ingenious conception and a reasonable structure, which effectively overcomes the problem of the high-pressure regulating valve. The disadvantage of the direct threaded connection design between the stem and the crosshead, this mechanism enables the high-pressure regulating valve to effectively avoid the impact force on the thread when the high-pressure regulating valve is closed quickly, so as to achieve the purpose of protecting the connecting thread between the valve stem and the crosshead, and improve the adjustment of the high-pressure regulating valve. stability in the process, and the connection structure of the utility model is also applicable to the connection of other workpieces whose threads are subjected to impact force.

Description of drawings

Fig. 1 is a schematic diagram of the connection structure between the valve stem and the crosshead of the high-pressure regulating valve of the present invention.

Marks in the figure: 1-valve stem, 2-cross head, 3-connecting hole, 4-lift nut, 5-guide groove, 6-guide pin, 7-screw plug, 8-backing ring, 9-stop plate, 10 - Set screw.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Example

The connection structure between the valve stem and the crosshead of the high-pressure regulating valve of the present utility model is shown in Figure 1. The lifting nut 4 is set in a sleeve, and the lifting nut 4 and the connecting hole 3 are both circular, and the lifting nut 4 is arranged in the connecting hole 3 with a clearance fit. The wall is provided with a guide pin 6 adapted to the guide groove 5, so that the lifting nut 4 cannot rotate in the connecting hole 3, and can only move along the axial direction of the connecting hole 3, so as to improve the convenience of assembly, and this non-rotatable The structure can also be realized by designing the lifting nut 4 and the inner section of the connecting hole 3 into a non-circular shape, such as a triangle or a polygon; the port of the connecting hole 3 is provided with a screw plug 7, and the screw plug 7 is threadedly connected with the connecting hole 3. The valve stem 1 passes through the screw plug 7 and is screwed and fixed with the lifting nut 4. The top of the valve stem 1 also passes through the lifting nut 4, and is tightened to the end face of the connection hole 3 through the backing ring 8. After assembly, the outer end of the lifting nut 4 pushes up. It is tight to the screw plug 7, and the inner end of the lifting nut 4 is not in contact with the end surface of the connecting hole 3, as shown by a mark in Figure 1, there is a gap of 2mm-4mm, and the optimal gap is 3mm.

In order to improve the reliability of this structure in operation, further, the end face of the crosshead 2 is welded with a stop plate 9 adapted to the valve stem 1, and the stop plate 9 is matched with the crosshead 2 to prevent the valve stem 1 from rotating. : The fitting position of the stop plate 9 of the valve stem 1 is processed into a four-sided square structure, which is snap-fitted and matched with the stop plate 9; in addition, the side wall of the crosshead 2 is also provided with a locking device for locking the screw plug 7. screw 10.

The structure of the indirect connection between the stem of the high-pressure regulating valve and the crosshead of the utility model has an ingenious conception and a reasonable structure, and effectively overcomes the disadvantages of the direct screw connection design between the stem and the crosshead of the high-pressure regulating valve. It effectively avoids the impact force of the thread during fast closing, achieves the purpose of protecting the connection thread between the valve stem and the cross head, and improves the stability of the high-pressure regulating valve during the adjustment process. At the same time, the connection structure of the utility model is also applicable to other Connection of workpieces whose threads are subject to impact.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (5)

1. a septum valve valve rod and crosshead connecting structure, comprise valve rod (1) and crosshead (2), it is characterized in that: the connecting end of described crosshead (2) offers attachment hole (3), in attachment hole (3), be arranged with hoisting nut (4), the port of attachment hole (3) is provided with plug screw (7), described valve rod (1) is threaded fixing through plug screw (7) with hoisting nut (4), described hoisting nut (4) and attachment hole (3) are circle, hoisting nut (4) Spielpassung is arranged in attachment hole (3), hoisting nut (4) outer wall offers guiding groove (5) vertically, crosshead (2) sidewall is provided with the guide finger (6) adaptive with guiding groove (5), forming valve rod (1) end holds out against in the end face of attachment hole (3) by gasket ring (8), the outer end of hoisting nut (4) holds out against in plug screw (7), and the structure that the inner of hoisting nut (4) does not contact with the end face of attachment hole (3).

2. septum valve valve rod as claimed in claim 1 and crosshead connecting structure, is characterized in that: the end face of described crosshead (2) is provided with the check plate (9) adaptive with valve rod (1).

3. septum valve valve rod as claimed in claim 2 and crosshead connecting structure, is characterized in that: described check plate (9) is welded in crosshead (2).

4. septum valve valve rod and the crosshead connecting structure as described in claim 1 or 2 or 3, is characterized in that: the sidewall of described crosshead (2) is also provided with the Cock screw (10) for plug screw (7) locking.

5. septum valve valve rod as claimed in claim 4 and crosshead connecting structure, is characterized in that: described hoisting nut (4) is 2mm-4mm with the gap of attachment hole (3) end face.