Gate valve rod protection structure

Abstract

The utility model discloses a gate valve rod protection structure, and particularly relates to the technical field of gate valves, the gate valve rod protection structure comprises a valve body and a valve rod body, the valve rod body is in threaded connection with the top surface of the valve body, a protection sleeve is fixedly installed on the top surface of the valve body, a rotating sleeve is movably connected in the protection sleeve, and the rotating sleeve is fixedly connected with the valve rod body. When the valve rod is used, the operation is simple, the exposed threads of the valve rod body can be hidden through the protective sleeve and the rotating sleeve, the joint between the protective sleeve and the rotating sleeve is sealed through the annular air bag, the sealing effect is good, the sealing effect is good, the sealing effect is good, and the sealing effect is good. Therefore, outside dust, moisture and various corrosive media are isolated and effectively prevented from invading the threaded area of the valve rod body, and the service life of the valve rod body is prolonged conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to gate valve technical field, more specifically, the utility model relates to a gate valve stem protection structure. BACKGROUND

[0002] Gate valve is a common valve type, its opening and closing part is the gate, the movement direction of the gate is perpendicular to the fluid direction, and the gate valve can only be fully opened and closed, and cannot be adjusted and throttled.

[0003] Gate valves are generally divided into open stem gate valves and stem-in-the-ground gate valves, the valve stem nut of the open stem gate valve is arranged on the valve body, the hand wheel is rotated to drive the valve stem to rotate, the valve stem usually has a trapezoidal thread, the rotating motion is converted into linear motion through the nut at the top of the valve and the guide groove on the valve body, so as to drive the gate to be lifted or lowered to realize the opening and closing of the valve, and the valve stem of the open stem gate valve can be seen, so it is an open stem gate valve, and the valve stem thread of the stem-in-the-ground gate valve is inside the valve body, and the opening and closing state of the valve cannot be directly observed through the lifting of the valve stem.

[0004] However, part of the thread of the valve stem of the open stem gate valve is exposed to the outside air during use, is easily corroded by the external environment, and fixed impurities such as dust and sand are easily entered into the thread, which may affect the service life and sealing performance of the gate valve after a long time. UTILITY MODEL CONTENTS

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiment of the utility model provides a gate valve stem protection structure, and the technical problems to be solved by the utility model are that part of the thread of the valve stem of the open stem gate valve is exposed to the outside air during use, is easily corroded by the external environment, and fixed impurities such as dust and sand are easily entered into the thread, which may affect the service life and sealing performance of the gate valve after a long time.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a gate valve stem protection structure, including valve body and valve stem body, and valve stem body is connected in the top surface of valve body by screw thread, the top surface of valve body is fixedly installed with the protection sleeve, the movable joint of rotating sleeve is in the protection sleeve, and rotating sleeve is fixedly connected with valve stem body, the inner wall of protection sleeve is bonded with annular air bag, the outside of protection sleeve is installed with a plurality of gas injection cylinder, the oil seal piston is slidably connected in each gas injection cylinder, the bottom surface of each oil seal piston and the bottom wall of corresponding gas injection cylinder are jointly installed with reset spring, each gas injection cylinder is connected with annular air bag through the communicating pipe, the outside of valve stem body is rotatably connected with the swivel, the outside of swivel is installed with a plurality of link rods, the limiting mechanism is equipped on each link rod, and the limiting mechanism limits the sliding of corresponding oil seal piston.

[0008] As Figures 1-4 shown, the embodiment is specific: by setting protection sleeve and rotating sleeve, when valve stem body rotates up and down, the thread exposed outside valve stem body can be protected by rotating sleeve and protection sleeve, at the same time, by gas injection cylinder, oil seal piston, the gas in gas injection cylinder is transported to annular air bag by the sliding of oil seal piston, so that annular air bag expands, and the connecting place between rotating sleeve and protection sleeve is sealed, so as to isolate dust, humidity and various corrosive media in the outside, effectively prevent its invasion in valve stem body thread area, facilitate to prolong the service life of valve stem body.

[0009] In a preferred embodiment, each of the limiting mechanisms includes a spring telescopic rod, and each spring telescopic rod is fixedly installed on the bottom surface of the corresponding link rod. The output end bottom surface of each spring telescopic rod is provided with a groove. The top surface of each oil seal piston is fixedly installed with a push rod, and the top end of each push rod penetrates the gas injection cylinder and abuts against the top wall of the corresponding groove. The top surface of each gas injection cylinder is elastically slidably connected with a pin, and each pin penetrates the corresponding push rod and spring telescopic rod.

[0010] In a preferred embodiment, the top surface of each gas injection cylinder is fixedly installed with a fixed plate, and a limiting spring is jointly installed between the outside of each pin and the fixed plate.

[0011] In a preferred embodiment, the output end of each push rod and spring telescopic rod is provided with a clamping groove, and each pin penetrates the corresponding clamping groove and extends outward.

[0012] In a preferred embodiment, a limiting ring is slidably connected in the protection sleeve, and the top end of the rotating sleeve is fixedly connected with the top surface of the limiting ring.

[0013] In a preferred embodiment, a hand wheel is installed on the top end of the valve stem body.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] 1、The utility model discloses a rotating sleeve, protective sleeve, air bag, oil seal piston etc. device is set up, realized when the valve stem body up and down sliding, can synchronous mobilization rotating sleeve and slide up and down, through the protective sleeve and rotating sleeve to the thread of valve stem body exposed outside is hidden, simultaneously through the oil seal piston pushes the air in the air injection cylinder and fills the annular air bag, to make the connecting place between rotating sleeve and protective sleeve, carries out the sealing, thereby insulating the dust, humidity and various corrosive medium of outside, effectively prevent its invasion valve stem body thread area, convenient for prolonging the service life of valve stem body's purpose.

[0016] 2、The utility model discloses a spring telescopic link, pin, push rod, swivel ring, link rod etc. device is set up, realized through pin and push rod of spring telescopic link are positioned, thereby can keep the inflation state of annular air bag, thereby keep the sealing effect between rotating sleeve and protective sleeve, simultaneously can make the rotating torque of valve stem body increase at this time, makes manual not easy rotating valve stem body, thereby reduces the damage of annular air bag when the inflation, the purpose of rotating sleeve sliding to annular air bag.

[0017] In summary, the utility model in using, simple operation can hide the thread of valve stem body exposed outside through protective sleeve and rotating sleeve, and seal the connecting place between protective sleeve and rotating sleeve through annular air bag, thereby insulating the dust, humidity and various corrosive medium of outside, effectively prevent its invasion valve stem body thread area, convenient for prolonging the service life of valve stem body. ACCURACY OF DRAWINGS

[0018] Figure 1 It is the structure schematic drawing of a gate valve stem protection structure that the utility model proposes;

[0019] Figure 2 It is the rotating sleeve cross section structure schematic drawing of a gate valve stem protection structure that the utility model proposes;

[0020] Figure 3 It is the air injection cylinder cross section structure schematic drawing of a gate valve stem protection structure that the utility model proposes;

[0021] Figure 4 It is the limiting mechanism structure schematic drawing of a gate valve stem protection structure that the utility model proposes.

[0022] In the drawing: 1 valve body, 2 protective sleeve, 3 rotating sleeve, 4 hand wheel, 5 valve stem body, 6 limiting ring, 7 annular air bag, 8 air injection cylinder, 9 swivel ring, 10 link rod, 11 spring telescopic link, 12 push rod, 13 oil seal piston, 14 return spring, 15 communication pipe, 16 recess, 17 clamping groove, 18 pin, 19 fixed plate, 20 limiting spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] Referring to Figures 1-4 A gate valve stem protection structure, including valve body 1 and valve stem body 5, and valve stem body 5 is screwed in the top surface of valve body 1, the top surface of valve body 1 is fixedly installed with protective sleeve 2, the rotatable sleeve 3 is movably connected in protective sleeve 2, and rotatable sleeve 3 is fixedly connected with valve stem body 5, annular air bag 7 is bonded on the inner wall of protective sleeve 2, a plurality of gas injection cylinders 8 are symmetrically installed on the outside of protective sleeve 2, oil seal piston 13 is slidably connected in each gas injection cylinder 8, reset spring 14 is jointly installed between the bottom surface of each oil seal piston 13 and the bottom wall of the position corresponding gas injection cylinder 8, each gas injection cylinder 8 is communicated with annular air bag 7 through communicating pipe 15, rotatable ring 9 is rotatably connected on the outside of valve stem body 5, a plurality of link rods 10 are symmetrically installed on the outside of rotatable ring 9, limiting mechanism is arranged on each link rod 10, and limiting mechanism limits the sliding of the position corresponding oil seal piston 13.

[0025] As Figures 1-4 The embodiment is specific as follows: by setting protective sleeve 2 and rotatable sleeve 3, when valve stem body 5 rotates up and down, the threads exposed outside valve stem body 5 can be protected by rotatable sleeve 3 and protective sleeve 2, at the same time, by gas injection cylinder 8, oil seal piston 13, the gas in gas injection cylinder 8 is transported to annular air bag 7 by the sliding of oil seal piston 13, so that annular air bag 7 expands, and the connecting part between rotatable sleeve 3 and protective sleeve 2 is sealed, so as to isolate dust, moisture and various corrosive media in the outside, effectively prevent them from invading the thread area of valve stem body 5, and facilitate to prolong the service life of valve stem body 5.

[0026] Each limiting mechanism comprises a spring telescopic rod 11, and the spring telescopic rod 11 is fixedly installed on the bottom surface of the corresponding connecting rod 10, the bottom surface of the output end of each spring telescopic rod 11 is provided with a groove 16, the top surface of each oil seal piston 13 is fixedly installed with a push rod 12, and the top end of each push rod 12 penetrates the gas injection cylinder 8 and abuts against the top wall of the corresponding groove 16, the top surface of each gas injection cylinder 8 is elastically and slidably connected with a pin 18, and each pin 18 penetrates the corresponding push rod 12 and spring telescopic rod 11, it is worth noting that the position of the spring telescopic rod 11 and the push rod 12 can be limited by the abutment of the groove 16 and the push rod 12 and the pin 18, so that the position of the oil seal piston 13 can be fixed, so that the annular air bag 7 always maintains an inflated state, thereby maintaining the sealing between the rotating sleeve 3 and the protective sleeve 2, and when the valve rod body 5 rotates and slides up and down, the rotating ring 9 drives the connecting rod 10 to slide up and down synchronously, but due to the spring force in the spring telescopic rod 11, the valve rod body 5 needs a larger torque to drive the connecting rod 10 to normally slide up and down, through this design, when the pin 18 limits the push rod 12 and the spring telescopic rod 11, the valve rod body 5 cannot be easily rotated, and the pin 18 needs to be separated from the push rod 12 and the spring telescopic rod 11 to normally rotate the valve rod body 5, so as to protect the annular air bag 7 and reduce the wear caused by the sliding of the rotating sleeve 3 when the annular air bag 7 is in an inflated state.

[0027] The top surface of each gas injection cylinder 8 is fixedly installed with a fixed plate 19, and the outer side between each pin 18 and the fixed plate 19 is jointly installed with a limiting spring 20, so that the pin 18 cannot be easily separated.

[0028] The output end of each push rod 12 and spring telescopic rod 11 is provided with a clamping groove 17, and each pin 18 penetrates the corresponding clamping groove 17 and extends outward.

[0029] The limiting ring 6 is slidably connected in the protective sleeve 2, and the top end of the rotating sleeve 3 is fixedly connected with the top surface of the limiting ring 6, so that the rotating sleeve 3 is prevented from being separated from the protective sleeve 2 by the limiting ring 6, and the top end of the valve rod body 5 is installed with a hand wheel 4.

[0030] The utility model discloses a valve stem body 5 is hidden in the thread of the protection sleeve 2 and the rotating sleeve 3 when rotating the hand wheel 4 and driving the valve stem body 5 to slide up and down, and then when the position of the valve stem body 5 is fixed, the push rod 12 can slide down by the recess 16 top wall of spring telescopic rod 11 output end and the push rod 12 top surface abutment, thereby the push rod 12 slides down, and the air in the air injection cylinder 8 is pushed out by the oil seal piston 13 and enters the annular air bag 7, thereby the annular air bag 7 expands, and the connection of the protection sleeve 2 and the rotating sleeve 3 is filled and sealed, reducing the dust, humidity and various corrosive media in the outside world, invading the thread area of the valve stem body 5.

[0031] When the spring telescopic rod 11 slides, the pin 18 is pulled outwards, and then when the spring telescopic rod 11 and the push rod 12 are sleeved together, the pin 18 is loosened, the pin 18 passes through the clamping groove 17 by the elastic force of the limiting spring 20, the push rod 12 and the spring telescopic rod 11 are limited, thereby the position of the push rod 12 is limited, the expansion state of the annular air bag 7 is kept, the rotating torque of the valve stem body 5 can be increased, the valve stem body 5 cannot be easily rotated manually, thereby the annular air bag 7 is protected, and the damage of the annular air bag 7 due to the sliding between the protection sleeve 2 and the rotating sleeve 3 when being in the expansion state is reduced.

[0032] The above only describes some exemplary embodiments of the utility model through the way of description, and it is needless to say that for ordinary skilled person in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the utility model. Therefore, the above drawings and description are illustrative in nature and should not be understood as limiting the scope of protection of the utility model claims.

Claims

1. A gate valve stem protection structure comprising a valve body (1) and a valve stem body (5) which is threadedly connected to the top surface of the valve body (1), characterized in that: The top surface of the valve body (1) is fixedly provided with a protective sleeve (2), the protective sleeve (2) is movably connected with a rotating sleeve (3), the rotating sleeve (3) is fixedly connected with a valve stem body (5), an annular air bag (7) is attached to the inner wall of the protective sleeve (2), a plurality of gas injection cylinders (8) are symmetrically arranged on the outer side of the protective sleeve (2), an oil seal piston (13) is slidably connected in each gas injection cylinder (8), a return spring (14) is arranged between the bottom surface of each oil seal piston (13) and the bottom wall of the corresponding gas injection cylinder (8), each gas injection cylinder (8) is connected with the annular air bag (7) through a communication pipe (15), a rotating ring (9) is rotatably connected to the outer side of the valve stem body (5), a plurality of link rods (10) are symmetrically arranged on the outer side of the rotating ring (9), a limiting mechanism is arranged on each link rod (10), and the limiting mechanism limits the sliding of the corresponding oil seal piston (13).

2. A gate valve stem protection structure as defined in claim 1, wherein: Each limiting mechanism comprises a spring telescopic rod (11), and each spring telescopic rod (11) is fixedly arranged on the bottom surface of the corresponding link rod (10), the bottom surface of the output end of each spring telescopic rod (11) is provided with a groove (16), the top surface of each oil seal piston (13) is fixedly provided with a push rod (12), and the top end of each push rod (12) penetrates the gas injection cylinder (8) and abuts against the top wall of the corresponding groove (16), the top surface of each gas injection cylinder (8) is elastically and slidably connected with a pin (18), and each pin (18) penetrates the corresponding push rod (12) and spring telescopic rod (11).

3. A gate valve stem protection structure as defined in claim 2, wherein: The top surface of each gas injection cylinder (8) is fixedly provided with a fixed plate (19), and a limiting spring (20) is arranged between the outer side of each pin (18) and the fixed plate (19).

4. A gate valve stem protection structure as claimed in claim 3, wherein: The output end of each push rod (12) and spring telescopic rod (11) is provided with a clamping groove (17), and each pin (18) penetrates the corresponding clamping groove (17) and extends outward.

5. A gate valve stem protection structure as claimed in claim 4, wherein: A limiting ring (6) is slidably connected in the protective sleeve (2), and the top end of the rotating sleeve (3) is fixedly connected with the top surface of the limiting ring (6).

6. A gate valve stem protection structure as claimed in claim 5, wherein: The top end of the valve stem body (5) is provided with a hand wheel (4).

Images