CN-122014875-A - Cantilever type track ball valve

CN122014875ACN 122014875 ACN122014875 ACN 122014875ACN-122014875-A

Abstract

The invention discloses a cantilever type track ball valve which comprises a valve body, a valve shaft and a hemispherical ball core. The guide assembly is arranged between the valve shaft and the track valve cover and comprises a guide shaft penetrating the valve shaft and a rolling shaft sleeve sleeved at the end part of the guide shaft, a guide track which is in sliding fit with the rolling shaft sleeve is arranged on the outer wall of the track valve cover, the lower part of the track is in a straight line shape, the upper part of the track is in a spiral line shape, and the straight line motion of the valve shaft can be converted into the combined motion of lifting and rotating. The upper end of the ball core is provided with a guide hole with a sliding block pin, the lower end of the valve shaft is provided with a curved track which is in sliding fit with the guide hole, and the lower end of the ball core is supported in the valve body through a trunnion. The valve seat component is provided with a scraper which elastically scrapes impurities on the spherical surface of the ball core in the opening and closing process, and is provided with a spring which automatically compensates for seal abrasion. The upper end of the valve shaft is in transmission connection with the straight stroke actuator through a connecting sleeve with a bearing. The invention has the advantages of accurate guiding, stable operation, self-cleaning and long-acting compensation functions of the sealing surface, effective elimination of impact, strong universality of the actuator and convenient maintenance.

Inventors

ZHANG CHUNHUI
ZHAO YUEFENG
XU YUGANG
LIAN HAILIN
BO NING
JIN GUOTAO
He Tongliang

Assignees

山东融锦智能装备科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260403

Claims (10)

1. The cantilever type track ball valve comprises a valve body (1), a valve shaft (20) rotatably installed in the valve body (1) and a hemispherical ball core (9) driven by the valve shaft (20), and is characterized by further comprising a guide assembly, wherein the guide assembly is arranged between the valve shaft (20) and a track valve cover (25) and is used for guiding the valve shaft (20) to move up and down and rotate, the guide assembly comprises a guide shaft (21) penetrating through the valve shaft (20) and a rolling shaft sleeve (22) sleeved at the end part of the guide shaft (21), a guide track (29) in sliding fit with the rolling shaft sleeve (22) is arranged on the outer wall of the track valve cover (25), and the guide track (29) is a closed track groove and is used for converting linear motion of the valve shaft (20) into rotary motion; The ball valve is characterized in that a guide hole (31) is formed in the upper end of the ball core (9), a sliding block pin (10) is arranged on the side wall of the guide hole (31), a bending track (30) is arranged at the lower end of the valve shaft (20), the bending track (30) is inserted into the guide hole (31) and is in sliding contact with the sliding block pin (10), the lower end of the ball core (9) is supported in the valve body (1) in a swinging and rotating mode through a trunnion (2), and therefore the ball core (9) is driven to move and rotate around an axis when the valve shaft (20) is lifted and rotated.
2. The cantilever type track ball valve according to claim 1, wherein the lower part of the guide track (29) is a vertical linear track groove, the upper part of the guide track is a spiral linear track groove, and the guide track (29) and the rolling shaft sleeve (22) are arranged in two and symmetrically distributed along the axis direction of the valve shaft (20).
3. The cantilever type track ball valve according to claim 1, wherein the upper end of the curved track (30) is arc-segment-shaped, the lower end of the curved track is linear, the cross section of the curved track is non-circular, and the curved track (30) is matched with the cross section of the guide hole (31).
4. The cantilever type track ball valve according to claim 1, wherein a valve seat assembly in sealing fit with the ball core (9) is arranged in the valve body (1), the valve seat assembly is arranged at a feed inlet end of the valve body (1), a sealing ring (7) is arranged at a contact end of the valve seat assembly and the ball core (9), a scraper (8) is detachably arranged on the sealing ring (7), and the inner edge of the scraper (8) is elastically contacted with the spherical surface of the ball core (9) in the opening and closing process of the valve to scrape attached impurities.
5. The cantilever type track ball valve according to claim 4, wherein the valve seat assembly further comprises a sealing compression ring (3), a spring (4), a sealing compression sleeve (5) and a sealing graphite ring (6), the sealing compression sleeve (5) is installed on the outer side of the sealing ring (7), the sealing graphite ring (6) is arranged between the sealing compression sleeve (5) and the sealing ring (7), the sealing compression ring (3) is installed on the outer side of the sealing compression sleeve (5) and connected with a feed inlet end of the valve body (1) in a detachable mode, and the spring (4) is arranged between the sealing compression ring (3) and the sealing compression sleeve (5).
6. The cantilever rail ball valve according to claim 1, characterized in that a packing seal structure is provided between the valve shaft (20) and the rail valve cover (25), the packing seal structure comprising a graphite packing assembly (14) arranged inside the rail valve cover (25) and a packing gland (16) compressing the graphite packing assembly (14); The graphite packing assembly (14) comprises more than three graphite rings, a sealing chamber structure is arranged on the inner side wall of the lower portion of the track valve cover (25), the graphite rings are vertically stacked in the sealing chamber structure and sleeved on the outer wall of the valve shaft (20), a sealing bush (32) is pressed on the graphite ring at the uppermost end, gland mounting grooves are symmetrically arranged on the side wall of the track valve cover (25) above the sealing chamber structure, two ends of a packing gland (16) are arranged in the gland mounting grooves, the middle of the packing gland (16) is sleeved on the valve shaft (20), and the packing gland (16) can seal and press the sealing bush (32).
7. Cantilever rail ball valve according to claim 6, characterized in that the side wall of the rail valve cap (25) is provided with a glue injection hole (34), and that the glue injection hole (34) is provided with a one-way valve plug (33).
8. The cantilever type track ball valve according to claim 1, wherein the upper end of the valve shaft (20) is in transmission connection with a straight stroke actuator through a connecting sleeve (27), a bearing (28) is arranged in the connecting sleeve (27), and the upper end of the valve shaft (20) is arranged in the bearing (28) in a penetrating manner, so that the straight stroke actuator can drive the valve shaft (20) to realize combined lifting and rotating movement through linear movement.
9. The cantilever type track ball valve according to claim 2, wherein a buffer mechanism is arranged above the vertical linear track groove of the guide track (29), the buffer mechanism comprises a buffer stop block (23), a buffer spring (24) and a buffer jackscrew (26), buffer bins are symmetrically arranged in the side wall of a track valve cover (25) above the vertical linear track groove, the buffer jackscrew (26), the buffer spring (24) and the buffer stop block (23) are sequentially arranged in the buffer bins from top to bottom, and the lower end of the buffer stop block (23) penetrates out of the buffer bins and is inserted into the guide track (29).
10. The cantilever rail ball valve of claim 1, further comprising blow-out preventing structure comprising a bevel outer conical surface land (35) at a lower end of the valve shaft (20) and a bevel inner conical surface ring groove (36) at a lower end of the rail valve cap (25), an outer wall of the bevel outer conical surface land (35) matching an inner wall of the bevel inner conical surface ring groove (36).

Description

Cantilever type track ball valve Technical Field The invention relates to the technical field of industrial valves, in particular to a cantilever track half ball valve suitable for high, medium and low pressure and full caliber and complex medium working conditions. Background The track ball valve is used as a novel valve which integrates the advantages of the ball valve and the gate valve, and is widely applied in the industrial field by virtue of the advantages of friction-free opening and closing, reliable sealing, quick on-off and the like. The existing track ball valve solves the problems that the traditional ball valve is large in opening and closing torque, insufficient in sealing reliability under high-pressure working conditions, slow in opening and closing speed of a gate valve and easy to separate and fall off of a flashboard, but the following defects still exist in practical application: 1. The guide structure has large friction and easy abrasion, the traditional valve rod is guided by sliding friction, and under the working condition of high-frequency opening and closing or high-pressure, the friction force between the guide pin and the spiral groove is large, so that the abrasion of parts is accelerated, radial offset is easy to generate, and the bonding uniformity of a sealing surface is influenced. 2. The sealing surface lacks protection and compensation, namely impurities are easy to deposit on the sealing surface in a medium (such as sewage and slurry) containing particles and easy to scale, so that the sealing surface is scratched during opening and closing, and internal leakage is caused. Meanwhile, the existing valve lacks an effective elastic compensation mechanism, and long-term abrasion of a sealing surface is difficult to compensate. 3. The cantilever valve rod has large impact vibration, namely, when the valve rod of the cantilever structure is rapidly opened and closed, especially at the end of the opening stroke, the joint of the valve rod and the ball body is easy to generate rigid impact, so that the pipeline is vibrated, and the service life of the valve is reduced. 4. The actuator has difficulty in selecting the type, the valve rod motion conversion mechanism of the traditional track ball valve is complex, a special actuator or an actuator with larger output torque is often required, and the industrial control requirements of high frequency and quick response are difficult to meet. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a cantilever type track ball valve so as to solve the technical problems of poor stability, easy failure of sealing, easy leakage of filling and difficult shape selection of an actuator of the existing track ball valve. The invention provides a cantilever type track ball valve, which comprises a valve body, a valve shaft rotatably arranged in the valve body and a hemispherical ball core driven by the valve shaft, and is characterized by further comprising a guide assembly, wherein the guide assembly is arranged between the valve shaft and a track valve cover and is used for guiding the valve shaft to move up and down and rotate; The ball valve comprises a ball core, a valve body, a valve shaft, a guide hole, a sliding block pin, a bending rail, a trunnion, a guide hole and a sliding block pin, wherein the upper end of the ball core is provided with the guide hole, the sliding block pin is arranged on the side wall of the guide hole, the lower end of the valve shaft is provided with the bending rail, the bending rail is inserted into the guide hole and is in sliding contact with the sliding block pin, and the lower end of the ball core is supported in the valve body in a swinging and rotating mode through the trunnion so as to drive the ball core to realize movement and rotation around an axis when the valve shaft is lifted and rotated. Preferably, the lower part of the guide rail is a vertical linear rail groove, the upper part of the guide rail surrounds the outer wall of the rail valve cover and is an S-shaped spiral linear rail groove, and the guide rail and the rolling shaft sleeve are arranged in two and symmetrically distributed along the axial direction of the valve shaft. Preferably, the upper end of the curved track is arc-segment-shaped, the lower end of the curved track is linear, the cross section of the curved track is a non-circular cross section, the curved track is matched with the cross section of the guide hole, and a moving gap is reserved between the curved track and the cross section of the guide hole. The valve body is internally provided with a valve seat assembly in sealing fit with the ball core, the valve seat assembly is arranged at the feed inlet end of the valve body, the contact end of the valve seat assembly and the ball core is provided with a sealing ring, a scraper is detachably arranged on the sealing ring, and the inner edge of the scraper is elastically contacted wit