Water turbine servomotor with locking groove

Abstract

A water turbine servomotor with a locking groove comprises a cylinder sleeve, a front end cover and a rear end cover are installed on the two sides of the cylinder sleeve respectively, a piston is arranged in the cylinder sleeve, a piston rod is arranged in the middle of the piston, a piston ring is arranged between the side face of the piston and the cylinder sleeve, and sealing rings are arranged on the two sides of the piston ring. A first locking groove and a second locking groove are machined in the front end of the piston rod, a connecting hole is formed in the front end cover, a locking pin is arranged in the connecting hole, when the piston rod retracts, the locking pin is clamped into the first locking groove, and when the piston retreats from the cylinder sleeve, the locking pin is clamped into the second locking groove. The locking pin is clamped into the first locking groove, a piston rod in a servomotor is fixed when a hydraulic turbine set is shut down for maintenance, the locking pin is clamped into the second locking groove, so that a piston is fixed after being exposed out of the tail of the cylinder sleeve, the piston does not need to be completely detached from the cylinder sleeve, and a sealing ring and a piston ring are convenient to replace.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stretchers, and particularly relates to a water turbine servomotor with locking grooves. BACKGROUND

[0002] The servomotor is used to drive the control ring of a water turbine unit. When the water turbine unit is shut down for maintenance, the servomotor needs to be locked to avoid damage to the equipment caused by misoperation of the servomotor. At present, some servomotors are provided with locking devices. The locking devices can only be locked when the piston rod is retracted, and cannot be locked in other states. Therefore, when the internal piston of the servomotor is checked, the piston needs to be disassembled from the cylinder body before the piston accessories can be replaced. UTILITY MODEL CONTENTS

[0003] The utility model solves the technical problems of the prior art, and provides a water turbine servomotor with locking grooves.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A water turbine servomotor with locking grooves, comprising a cylinder sleeve, front and rear end covers respectively arranged on the two sides of the cylinder sleeve, a piston arranged in the cylinder sleeve, a piston rod arranged in the middle of the piston, a piston ring arranged between the side surface of the piston and the cylinder sleeve, and sealing rings arranged on the two sides of the piston ring, wherein a first locking groove and a second locking groove are machined at the front end of the piston rod, a connecting hole is arranged on the front end cover, a locking pin is arranged in the connecting hole, the locking pin is clamped into the first locking groove when the piston rod is retracted, and the locking pin is clamped into the second locking groove when the piston is withdrawn from the cylinder sleeve.

[0006] Further, the distance from the center of the second locking groove to the end surface of the piston is less than the distance from the center of the locking pin to the tail of the cylinder sleeve.

[0007] Further, a pin head is machined at the locking end of the locking pin, a stepped surface is machined at the bottom of the connecting hole, a spring is arranged between the pin head and the stepped surface, and a locking nut is arranged on the upper end of the locking pin and passes through the connecting hole.

[0008] Further, a connecting disc is arranged on the front end cover, and the connecting disc is connected to the cylinder sleeve through studs and nuts.

[0009] Further, a mechanical seal is arranged between the front end cover and the piston rod.

[0010] Further, hydraulic oil inlets are machined on the front end cover and the rear end cover.

[0011] Compared with the prior art, the water turbine servomotor with the locking grooves has the locking pin clamped into the first locking groove to fix the piston rod in the servomotor during maintenance of the water turbine set, and the locking pin is clamped into the second locking groove to fix the piston after being exposed from the tail of the cylinder sleeve, so that the piston does not need to be completely disassembled from the cylinder sleeve, thereby facilitating replacement of the sealing ring and the piston ring. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic view of the utility model;

[0013] Figure 2 is a structural schematic view of the utility model when the locking pin is connected with the second locking groove;

[0014] Wherein, 1, cylinder sleeve, 2, front end cover, 3, rear end cover, 4, stud, 5, piston, 6, piston ring, 7, sealing ring, 8, piston rod, 9, connecting flange, 10, mechanical seal, 11, hydraulic oil inlet, 12, first locking groove, 13, second locking groove, 14, locking pin, 15, spring, 15, locking nut. DETAILED DESCRIPTION

[0015] The technical scheme in the utility model embodiment will be described clearly and completely.

[0016] As Figure 1 shown, a water turbine servomotor with locking grooves comprises a cylinder sleeve 1, and the cylinder sleeve 1 is provided with a front end cover 2 and a rear end cover 3 on both sides, wherein the front end cover 2 is provided with a connecting disc, the cylinder sleeve 1 is connected with a stud 4 on the end face, the stud 4 passes through the connecting disc and is locked by a nut, the rear end cover 3 is locked with the cylinder sleeve by screws around the periphery, the cylinder sleeve 1 is provided with a piston 5 inside, the side surface of the piston 5 and the cylinder sleeve 1 are provided with a piston ring 6, the both sides of the piston ring 6 are provided with a sealing ring 7, the piston 5 is provided with a piston rod 8 in the middle, the piston rod 8 is processed with a connecting flange 9, the connecting flange 9 is connected with the piston 5 by screws, and the piston rod 8 and the front end cover 2 are provided with a mechanical seal 10.

[0017] The front end cover 2 and the rear end cover 3 are both processed with a hydraulic oil inlet 11, the hydraulic oil inlet 11 introduces hydraulic oil into the cylinder sleeve to control the movement of the piston 5.

[0018] The piston rod 8 has a first locking groove 12 and a second locking groove 13 machined at its front end. The front end cover 2 has a connecting hole, and a locking pin 14 is installed in the connecting hole. The locking end of the locking pin 14 has a pin head. The bottom of the connecting hole has a stepped surface. A spring 15 is installed between the pin head and the stepped surface. The spring 15 provides elastic force to make the pin head engage in the locking groove. The upper end of the locking pin 14 passes through the connecting hole and is fitted with a locking nut 16. The locking nut 16 adjusts the extension length of the pin head. When the turbine unit is shut down for maintenance, the locking nut 16 is adjusted. At this time, the piston rod 8 of the relay is retracted, and the pin head of the locking pin 14 engages in the first locking groove, fixing the piston rod 18. When the relay is maintained, the rear end cover 3 is removed, the piston 5 is withdrawn from the tail of the cylinder liner 1, and the locking pin 14 engages in the second locking groove 13, fixing the piston 5.

[0019] In this embodiment, the distance H from the center of the second locking groove 13 to the end face of the piston 5 is less than the distance D from the center of the locking pin 14 to the tail of the cylinder liner 1. Figure 2 As shown, since the distance from the center of the second locking groove 13 to the end face of the piston 5 is less than the distance from the center of the locking pin 14 to the tail of the cylinder liner 1, after the piston 5 exits from the tail of the cylinder liner 1, a small part of the piston 5 remains inside the cylinder liner 1. After replacing the piston rings and sealing rings, and after loosening the locking pin 14, the piston 5 can be easily pushed into the cylinder liner 1 because a small part of the piston 5 still remains inside the cylinder liner 1.

[0020] This utility model is not limited to the embodiments described. Those skilled in the art can still make some modifications or changes without departing from the spirit and scope of this utility model. Therefore, the scope of protection of this utility model shall be determined by the scope defined in the claims.

Claims

1. A turbine relay device with a locking groove, comprising a cylinder liner, a front end cover and a rear end cover respectively installed on both sides of the cylinder liner, a piston disposed inside the cylinder liner, a piston rod disposed in the middle of the piston, a piston ring disposed between the side of the piston and the cylinder liner, and sealing rings disposed on both sides of the piston ring, characterized in that: The piston rod has a first locking groove and a second locking groove machined at its front end. The front end cover has a connecting hole with a locking pin inside. When the piston rod retracts, the locking pin engages in the first locking groove. When the piston exits from the cylinder liner, the locking pin engages in the second locking groove.

2. A turbine relay device with a locking groove according to claim 1, characterized in that: The distance from the center of the second locking groove to the piston end face is less than the distance from the center of the locking pin to the tail of the cylinder liner.

3. A turbine relay device with a locking groove according to claim 1, characterized in that: The locking pin has a pin head at the locking end, and the bottom of the connecting hole has a stepped surface. A spring is provided between the pin head and the stepped surface, and a locking nut is installed at the upper end of the locking pin through the connecting hole.

4. A turbine relay device with a locking groove according to claim 1, characterized in that: The front end cover is provided with a connecting plate, which is connected to the cylinder liner by studs and nuts.

5. A turbine relay device with a locking groove according to claim 1, characterized in that: A mechanical seal is provided between the front end cover and the piston rod.

6. A turbine relay device with a locking groove according to claim 1, characterized in that: Both the front and rear covers are machined with hydraulic oil inlets.

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