Large-diameter piston type regulating valve

Abstract

The utility model discloses a large-caliber piston type regulating valve which is provided with a valve body, a guide cylinder is arranged in the valve body, a piston is arranged in the guide cylinder, O-shaped sealing rings are arranged between the piston and the guide cylinder, a piston driving device is arranged between a valve rod and the piston, the piston driving device comprises a first bevel gear, a second bevel gear and a gear box, the first bevel gear and the second bevel gear are arranged in the gear box, the lead screw penetrates through the gear box to be matched with the second bevel gear, and one end of the lead screw penetrating through the gear box is connected to the stainless steel piston; a groove is formed in the inner circumference of the rear end of the guide cylinder, the O-shaped sealing ring is located in the groove, a supporting copper ring is inserted in the groove, the rear end of the supporting copper ring is connected with a positioning ring, an annular gap is formed between the positioning ring and the end face of the rear end of the guide cylinder, the positioning ring is installed at the rear end of the guide cylinder through a positioning bolt, and an adjusting nut is installed on the positioning bolt. According to the piston driving device, the piston cannot be subjected to radial force, and meanwhile the piston can be effectively prevented from sinking.

Description

Technical Field

[0001] The utility model relates to a large-caliber piston-type regulating valve. Background Art

[0002] A piston-type regulating valve is a special valve that not only cuts off the flow of media in a pipeline but also precisely adjusts flow according to different operating conditions. Existing large-diameter piston-type regulating valves feature a cylindrical valve body with a water inlet at the front and a water outlet at the rear. A coaxial guide cylinder is positioned within the valve body, housing a coaxial, mating stainless steel piston. An O-ring seal is installed between the piston and the guide cylinder. A valve stem, perpendicular to the valve body axis, is inserted into the valve body, with a piston drive mechanism located between the valve stem and the piston.

[0003] In the prior art, the piston drive device between the valve shaft and piston of a large-diameter piston-type regulating valve is a crank-connecting rod mechanism. During use, the valve shaft is driven to rotate. This rotation, through the crank-connecting rod, drives the piston to slide axially within the guide cylinder. This regulates the flow rate or pressure of the pipeline medium after the valve by changing the flow area between the piston sealing ring and the valve body sealing ring. When the crank-connecting rod drive device drives the piston to slide axially within the guide cylinder of this large-diameter piston-type regulating valve, the piston is subjected to both axial and radial forces. Due to the sliding fit between the guide cylinder and the piston, the radial force can cause the axial sliding of the piston to jam. This jamming not only increases the unpredictable switching torque of the large-diameter piston-type regulating valve, but also increases the wear between the sliding mating surfaces. The wear of the sliding mating surfaces causes the axis of the guide cylinder and the piston to deviate, thereby reducing the performance of the large-diameter piston-type regulating valve. In addition, when adjusting the flow and pressure, the piston of the regulating valve needs to be frequently adjusted, which causes great wear on the O-ring between the piston and the guide cylinder, resulting in internal leakage of the valve. The O-ring between the piston and the guide cylinder needs to be replaced frequently, which reduces the service life of the sealing ring. At the same time, due to the heavy weight of the large-diameter piston, the lower part of the O-ring is easily deformed, which will cause the piston to sink and cause the seal to fail. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and to provide a large-diameter piston-type regulating valve which does not subject the piston to radial force and can effectively prevent the piston from sinking.

[0005] In order to solve the above technical problems, the utility model provides a large-caliber piston-type regulating valve, which has a cylindrical valve body, a water inlet at the front end of the valve body and a water outlet at the rear end, a coaxial guide cylinder positioned in the valve body, a coaxial matching stainless steel piston installed in the guide cylinder, an O-shaped sealing ring is provided between the piston and the guide cylinder, a valve stem perpendicular to the valve body axis is inserted into the valve body, a piston driving device is provided between the valve stem and the piston, and is characterized in that: the piston driving device includes a first bevel gear installed at the end of the valve shaft and a second bevel gear matching the first bevel gear, whose axis is in the same straight line as the axis of the guide cylinder, and also includes a gear box, which is positioned in the guide cylinder by a fixed rib plate connected to the wall of the guide cylinder, and the first and second bevel gears are fixed in the guide cylinder. Installed in the gear box, the lead screw passes through the gear box and cooperates with the second bevel gear. The rotation of the second bevel gear can drive the linear motion of the lead screw. One end of the lead screw passing through the gear box is positioned and connected to the stainless steel piston; a circumferential groove is formed on the inner circumference of the cylinder body at the rear end of the guide cylinder, and the O-ring is located in the circumferential groove. A supporting copper ring for the stainless steel piston to slide along the axis of the valve body is inserted into the circumferential groove. The front end of the supporting copper ring abuts against the O-ring, and the rear end is connected to a positioning ring perpendicular to the axis of the supporting copper ring. There is an annular gap between the positioning ring and the end face of the rear end of the guide cylinder. The positioning ring is installed on the rear end of the guide cylinder through positioning bolts installed at intervals thereon, and an adjusting nut is installed on the positioning bolt.

[0006] With the large-diameter piston-type regulating valve of the above structure, when the valve shaft is driven to rotate by the driving device, the rotation of the first bevel gear drives the corresponding rotation of the second bevel gear, and the rotation of the second bevel gear can drive the linear motion of the lead screw. Since one end of the lead screw is positioned and connected to the piston, the linear motion of the lead screw will drive the linear motion of the piston, and will not cause the piston to be subjected to radial force, and therefore will not cause the axial sliding of the piston to produce jamming. In the utility model, since a supporting copper ring is provided, the weight of the stainless steel piston is mainly supported by the supporting copper ring, which can effectively prevent the piston from sinking, and avoid the problem of sealing failure caused by piston sinking. After long-term use and wear of the O-ring, the sealing effect of the sealing ring can be restored by adjusting the adjusting nut on the positioning bolt to move the supporting copper ring forward and squeeze the O-ring, thereby extending the service life of the O-ring.

[0007] As an improvement to the present invention, the rear end barrel bottom of the stainless steel piston is further connected to an energy dissipation cylinder. Circumferentially uniformly distributed support blocks are installed on the inner side of the rear end barrel bottom of the stainless steel piston. A tightening screw is installed at the end of the support block, and one end of the tightening screw rests on the inner wall of the energy dissipation cylinder. In the present invention, an energy dissipation cylinder is connected to the rear end barrel bottom of the piston to adjust the flow or pressure of the pipeline medium. By providing circumferentially uniformly distributed support blocks on the inner side of the rear end barrel bottom of the piston, a tightening screw is screwed onto the end of the support block, and the end of the tightening screw rests on the inner wall of the energy dissipation cylinder, the energy dissipation cylinder can be prevented from deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be described in further detail below with reference to the accompanying drawings.

[0009] Figure 1 The utility model is a schematic diagram of the main structure of a large-caliber piston-type regulating valve.

[0010] Figure 2 yes Figure 1 A schematic diagram of a partially enlarged cross-section of the structure.

[0011] Figure 3 yes Figure 1 A magnified schematic diagram of the structure at position I in the figure.

[0012] Figure 4 After removing the supporting copper ring Figure 3 .

[0013] Figure 5 yes Figure 1 A magnified schematic diagram of the structure at position II. DETAILED DESCRIPTION

[0014] See also Figure 1 - Figure 5The utility model is a large-diameter piston-type regulating valve, which has a cylindrical valve body 1, a water inlet 2 at the front end of the valve body, and a water outlet 3 at the rear end. A coaxial guide cylinder 4 is positioned in the valve body, and a coaxial matching stainless steel piston 5 is installed in the guide cylinder. An O-shaped sealing ring 6 is provided between the piston and the guide cylinder. A valve stem 7 perpendicular to the valve body axis is inserted into the valve body, and a piston driving device 8 is provided between the valve stem and the piston. It is characterized in that: the piston driving device includes a first bevel gear 9 installed at the end of the valve shaft 7 and a second bevel gear 10 that cooperates with the first bevel gear and whose axis is in the same straight line as the axis of the guide cylinder 4, and also includes a gear box 11. The gear box is positioned in the guide cylinder by a fixed rib 12 connected to the wall of the guide cylinder, and the first and second bevel gears are installed in the gear box. The lead screw 13 passes through the gear box and cooperates with the second bevel gear 10. The rotation of the second bevel gear can drive the linear motion of the lead screw. One end of the lead screw passing through the gear box is positioned and connected to the stainless steel piston 5; a circumferential groove 14 is formed on the inner circumference of the cylinder body at the rear end of the guide cylinder 4, and the O-ring 6 is located in the circumferential groove 14. A supporting copper ring 15 is inserted into the circumferential groove for the stainless steel piston 5 to slide along the axis of the valve body. The front end of the supporting copper ring abuts against the O-ring, and the rear end is connected to a positioning ring 16 perpendicular to the axis of the supporting copper ring. There is an annular gap 17 between the positioning ring and the end face of the rear end of the guide cylinder. The positioning ring is mounted on the rear end of the guide cylinder through positioning bolts 18 installed at intervals thereon, and an adjusting nut 19 is installed on the positioning bolt. The rear end bottom of the stainless steel piston is also connected to an energy dissipation cylinder 20, and the inner side of the rear end bottom of the stainless steel piston is equipped with circumferentially evenly distributed support blocks 21, and the end of the support block is equipped with a tightening screw 22, one end of the tightening screw rests on the inner wall of the energy dissipation cylinder 20.

[0015] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Any modification or equivalent replacement of the present invention to achieve the same technical effect is within the scope of protection of the present invention.

Claims

1. A large-caliber piston-type regulating valve having a cylindrical valve body (1), a water inlet (2) at the front end of the valve body, a water outlet (3) at the rear end, a coaxial guide cylinder (4) positioned in the valve body, a coaxial stainless steel piston (5) mounted in the guide cylinder, an O-ring (6) provided between the piston and the guide cylinder, a valve stem (7) perpendicular to the valve body axis inserted into the valve body, a piston drive device (8) provided between the valve stem and the piston, characterized in that: The piston drive device includes a first bevel gear (9) mounted on the end of the valve stem (7) and a second bevel gear (10) that cooperates with the first bevel gear and whose axis is in the same straight line as the axis of the guide cylinder (4). It also includes a gear box (11). The gear box is positioned in the guide cylinder through a fixed rib (12) connected to the wall of the guide cylinder. The first and second bevel gears are installed in the gear box. The screw (13) passes through the gear box and cooperates with the second bevel gear (10). The rotation of the second bevel gear can drive the linear motion of the screw. One end of the screw passing through the gear box is positioned and connected to the stainless steel piston (5). A circumferential groove (14) is formed on the inner circumference of the cylinder body at the rear end of the guide cylinder (4), and the O-ring (6) is located in the circumferential groove (14). A supporting copper ring (15) for the stainless steel piston (5) to slide along the axis of the valve body is inserted into the circumferential groove. The front end of the supporting copper ring abuts against the O-ring, and the rear end is connected to a positioning ring (16) perpendicular to the axis of the supporting copper ring. An annular gap (17) is provided between the positioning ring and the end face of the rear end of the guide cylinder. The positioning ring is mounted on the rear end of the guide cylinder through positioning bolts (18) installed at intervals thereon, and an adjusting nut (19) is installed on the positioning bolt.

2. The large-diameter piston-type regulating valve according to claim 1, characterized in that: The rear end barrel bottom of the stainless steel piston is also connected to an energy dissipation cylinder (20), and the inner side of the rear end barrel bottom of the stainless steel piston is provided with circumferentially evenly distributed support blocks (21), and the end of the support block is provided with a tightening screw (22), one end of which abuts against the inner wall of the energy dissipation cylinder (20).

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