CN212004324U

CN212004324U - Gate valve

Info

Publication number: CN212004324U
Application number: CN202020710072.6U
Authority: CN
Inventors: 李家德; 吴高峰
Original assignee: Taizhou Aidi Xishengda Tube Co ltd
Current assignee: Taizhou Aidi Xishengda Tube Co ltd
Priority date: 2020-05-04
Filing date: 2020-05-04
Publication date: 2020-11-24
Anticipated expiration: 2030-05-04

Abstract

The utility model provides a gate valve belongs to valve manufacturing technical field. It has solved the inconvenient, not good problem of leakproofness of current gate valve operation. This gate valve includes valve body, valve rod, valve plate, valve gap and hand wheel, valve gap and valve body threaded connection, and the valve plate is located the valve body, the inner and the valve plate threaded connection of valve rod, and the valve gap setting is worn out to the outer end of valve rod, and the valve gap top has linked firmly the gland, and the axis level and the perpendicular to valve gap setting of hand wheel, the drive mechanism that the hand wheel was equipped with between through gland and the valve gap drive the valve rod and rotate, and the valve plate inlays and is equipped with the sealing washer, and when the valve plate shutoff behind the valve body. The utility model has the advantages of simple operation, good sealing performance and the like.

Description

Gate valve

Technical Field

The utility model belongs to the technical field of the valve is made, a gate valve is related to.

Background

The gate valve is a commonly used valve, and is defined as follows in the standard GB/T21465-2008 "valve nomenclature": the opening and closing piece (flashboard) is driven by the valve rod, and the valve moves linearly along the valve seat (sealing surface), namely, the circulation or the stop of a medium can be realized through the lifting of the valve plate.

For example, the chinese patent literature discloses a locking gate valve [ 201620694413.9; authorization notice number: CN2058411827U ], which comprises a valve body, a valve plate, a valve rod, a valve cover and a hand wheel, wherein the valve plate is located in the valve body, the lower end of the valve rod is in threaded connection with the valve plate, the valve cover is fixedly connected to the valve body, the upper end of the valve rod passes through the valve body and is located in the valve cover and is axially and fixedly connected with the valve cover, the upper end surface of the valve rod is provided with a connecting hole arranged along the axis of the valve rod, the hand wheel comprises a round wheel and an insert rod fixedly connected with the round wheel, the insert rod is sleeved with a sleeve, the outer diameter of which is slightly smaller than the aperture of the connecting hole, the side wall of the sleeve is provided with a gap, the lower end of the insert rod is provided with an eccentric column, the outer side surface of the lower end of the eccentric column is provided with a baffle plate protruding the outer side surface of the eccentric column, the roller, when the inserted bar is inserted into the connecting hole and rotates, the outer side surface of the eccentric column can abut against the contact surface of the stop block and push the stop block to enable the outer end of the stop block to extend out of the notch and abut against the hole wall of the connecting hole.

The locking gate valve can realize locking through the arrangement of the eccentric column, the stop block and the connecting hole, but has a complex structure, and the structure of the locking gate valve requires the horizontal direction and the hand wheel to be arranged above the existing gate valve, so that the space is limited, the hand wheel realizes the switch above the valve body, the locking gate valve is inconvenient to operate, and the sealing property of the valve plate is not ideal.

Disclosure of Invention

The utility model aims at providing a gate valve that simple operation and leakproofness are good to the above-mentioned problem that exists among the prior art.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a gate valve, includes valve body, valve rod, valve plate, valve gap and hand wheel, valve gap and valve body threaded connection, the valve plate be located the valve body, the inner and valve plate threaded connection of valve rod, the valve gap setting is worn out to the outer end of valve rod, its characterized in that, the valve gap top linked firmly the gland, the axis level of hand wheel and perpendicular to valve gap setting, the hand wheel drive the valve rod through the drive mechanism who is equipped with between gland and the valve gap and rotate, the valve plate inlay and be equipped with the sealing washer, after the valve plate shutoff behind the valve body the sealing washer seal in the sealed face of valve body.

In a foretell gate valve, drive mechanism include worm wheel and with worm wheel engaged with worm, the worm wheel link firmly on the valve rod, the worm level set up between gland and valve gap, the outer end of worm stretches out the valve gap and links firmly mutually with the hand wheel.

In the gate valve, an accommodating cavity for accommodating the worm wheel is formed between the valve cover and the gland, and the gland is provided with a limiting hole for the valve rod to penetrate through the top of the worm wheel and to be inserted. The worm wheel installation is spacing convenient like this, and spacing hole makes the top of valve rod spacing moreover, and the valve rod can not rock, rotates steadily, noiselessness.

In the gate valve, the outer walls of the two sides of the worm in the thread section of the worm are respectively provided with a first O-shaped ring in a sleeved mode, and the valve cover and the gland are provided with mounting grooves matched with the first O-shaped rings. Therefore, the worm has good rotation stability.

In the gate valve, the valve rod has a radial section which is supported by the worm wheel and protrudes radially outwards, the valve cover has a step which protrudes radially inwards and is supported at the bottom of the radial section, the radial section is embedded with at least two sealing rings which are sealed on the inner wall of the upper part of the step, and the gland is fixedly connected with the valve cover through screws.

In the above gate valve, the outer walls of the upper end and the lower end of the valve plate are conical surfaces, the number of the sealing rings is two, the sealing rings are respectively embedded on the corresponding conical surfaces, and the two sealing surfaces of the valve body are conical surfaces matched with the corresponding conical surfaces. Through conical surface and conical surface cooperation like this, the leakproofness is good, and after the conical surface of sealing washer, valve plate took place wearing and tearing, the valve plate descends a bit distance again and just can compensate the wearing and tearing clearance, and the leakproofness is good, long service life.

In the gate valve, an O-shaped ring II is arranged between the valve cover and the valve body, and the inner wall of the lower part of the step of the valve cover is embedded with a packing seal sealed on the valve rod. The O-shaped ring is sleeved at the root of the threaded section of the valve cover and sealed in the valve body, so that the sealing property between the valve cover and the valve body is ensured, and the sealing property between the valve rod and the valve cover is ensured by packing sealing.

Compared with the prior art, the gate valve is convenient to operate, wide in application range, good in working stability, good in sealing performance and long in service life.

Drawings

FIG. 1 is a side view showing the structure of the gate valve.

Fig. 2 is a structural sectional view of the section a-a in fig. 1.

Fig. 3 is a structural sectional view of section B-B in fig. 1.

In the figure, 1, a valve body; 2. a valve stem; 21. a nose section; 3. a valve plate; 31. a conical surface; 4. a valve cover; 41. a step; 5. a hand wheel; 6. a gland; 7. a seal ring; 8. a worm gear; 9. a worm; 10. a limiting hole; 11. a first O-shaped ring; 12. a seal ring; 13. a screw; 14. an O-shaped ring II; 15. and (5) packing and sealing.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, fig. 2 and fig. 3, this gate valve includes valve body 1, valve rod 2, valve plate 3, valve gap 4 and hand wheel 5, valve gap 4 and 1 threaded connection of valve body, valve plate 3 is located valve body 1, the inner and 3 threaded connection of valve plate of valve rod 2, valve gap 4 sets up is worn out to the outer end of valve rod 2, valve gap 4 top has linked firmly gland 6, the axis level of hand wheel 5 and perpendicular to valve gap 4 set up, hand wheel 5 drives valve rod 2 through the drive mechanism that is equipped with between gland 6 and the valve gap 4 and rotates, valve plate 3 inlays and is equipped with sealing washer 7, when 3 shutoff of valve plate in valve body 1 after, sealing washer 7 seals in the sealed face of valve body 1.

After the gate valve is installed, the hand wheel 5 is positioned on the outer side surface of the valve body 1, the hand wheel 5 cannot be easily rotated due to the limitation of the upper space, the hand wheel 5 is rotated, the hand wheel 5 drives the valve rod 2 to rotate through the transmission mechanism, the valve rod 2 drives the valve plate 3 to lift so as to complete opening and closing work, and the operation is convenient and fast; the sealing ring 7 enables the valve plate 3 and the valve body 1 to be sealed hard, has soft sealing, achieves double sealing effect, is good in sealing performance and ideal in partition effect, and prevents media from passing between the blocked valve plate 3 and the valve body 1.

In further detail, the transmission mechanism comprises a worm wheel 8 and a worm 9 meshed with the worm wheel 8, the worm wheel 8 is fixedly connected to the valve rod 2, the top end outer wall of the valve rod 2 for the worm wheel 8 to penetrate through is provided with a vertical cutting face, a center hole of the worm wheel 8 is matched with the cross section shape of the top end of the valve rod 2 to achieve circumferential limiting, the worm 9 is horizontally arranged between the gland 6 and the valve cover 4, and the outer end of the worm 9 extends out of the valve cover 4 and is fixedly connected with the hand wheel 5. The hand wheel 5 drives the worm 9 to rotate, the worm 9 drives the worm wheel 8 and the valve rod 2 to rotate, and the valve rod 2 drives the valve plate 3 to lift to realize opening and closing; worm wheel 8, the transmission of worm 9 is steady, and the noiselessness has the auto-lock nature moreover, and worm wheel 8 can be driven to worm 9, and worm wheel 8 can not drive worm 9 and rotate, and this gate valve is in the use promptly, and valve plate 3, valve rod 2 receive the medium punching press, and valve rod 2 also can not rotate and influence the degree of opening of valve rod 2, and job stabilization nature is good.

The valve rod 2 is provided with a radial convex section 21 which is supported on the worm wheel 8 and is convex outwards in the radial direction, the valve cover 4 is provided with a step 41 which is convex inwards in the radial direction and is supported at the bottom of the radial convex section 21, two sealing rings 12 which are sealed on the inner wall of the upper part of the step 41 of the valve cover 4 are embedded in the radial convex section 21, and four corners of the gland 6 are fixedly connected with the valve cover 4 through screws 13. Sealing ring 12 has guaranteed the leakproofness between flange section 21 and valve gap 4, flange section 21 and step 41's setting make valve rod 2 axial positioning firm, go out or when needing this gate valve locking, valve plate 3 is in complete shutoff state, unscrew screw 13 is in order to open gland 6 again, later make valve rod 2 break away from valve plate 3 with valve rod 2 rotation, then take valve rod 2 out, with valve rod 2, valve gap 4, worm 9 and hand wheel 5 are preserved, thereby avoid the maloperation, and avoid other people to open this gate valve and steal the medium, the theftproof function has, and convenient operation.

In order to have good working stability, an accommodating cavity for accommodating the worm wheel 8 is arranged between the valve cover 4 and the gland 6, the gland 6 is provided with a limiting hole 10 for inserting the valve rod 2 into the worm wheel 8 after penetrating out of the top of the worm wheel 8, the outer walls of two sides of the thread section of the worm 9 are respectively sleeved with an O-shaped ring I11, and the valve cover 4 and the gland 6 are provided with mounting grooves matched with the O-shaped ring I11; for good sealing performance and long service life, the outer walls of the upper end and the lower end of the valve plate 3 are conical surfaces 31, the number of the sealing rings 7 is two, the sealing rings are respectively embedded on the corresponding conical surfaces 31, the two sealing surfaces of the valve body 1 are conical surfaces matched with the corresponding conical surfaces 31, an O-shaped ring II 14 is arranged between the valve cover 4 and the valve body 1, and the inner wall of the lower part of the step 41 of the valve cover 4 is embedded with a packing seal 15 sealed on the valve rod 2.

Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A gate valve comprises a valve body (1), a valve rod (2), a valve plate (3), a valve cover (4) and a hand wheel (5), the valve cover (4) is in threaded connection with the valve body (1), the valve plate (3) is positioned in the valve body (1), the inner end of the valve rod (2) is in threaded connection with the valve plate (3), the outer end of the valve rod (2) penetrates through the valve cover (4) to be arranged, it is characterized in that the top of the valve cover (4) is fixedly connected with a gland (6), the axis of the hand wheel (5) is arranged horizontally and vertical to the valve cover (4), the hand wheel (5) drives the valve rod (2) to rotate through a transmission mechanism arranged between the gland (6) and the valve cover (4), the valve plate (3) is embedded with a sealing ring (7), and after the valve plate (3) is plugged in the valve body (1), the sealing ring (7) is sealed on the sealing surface of the valve body (1).

2. A gate valve according to claim 1, characterized in that the transmission mechanism comprises a worm wheel (8) and a worm (9) engaged with the worm wheel (8), the worm wheel (8) is fixedly connected to the valve rod (2), the worm (9) is horizontally arranged between the gland (6) and the valve cover (4), and the outer end of the worm (9) extends out of the valve cover (4) and is fixedly connected with the hand wheel (5).

3. A gate valve according to claim 2, characterised in that a receiving cavity for receiving the worm wheel (8) is provided between the valve cover (4) and the gland (6), and the gland (6) is provided with a limiting hole (10) for inserting the valve stem (2) through the top of the worm wheel (8).

4. A gate valve according to claim 3, characterized in that the worm (9) is sleeved with a first O-ring (11) on the outer wall of each of two sides of the thread section of the worm, and the valve cover (4) and the gland (6) are provided with mounting grooves adapted to the first O-ring (11).

5. A gate valve according to claim 4, characterized in that the valve stem (2) has a radial section (21) supported by the worm wheel (8) and protruding radially outwards, the valve cover (4) has a step (41) protruding radially inwards and supported by the bottom of the radial section (21), the radial section (21) is embedded with at least two sealing rings (12) sealing the inner wall of the valve cover (4) on the upper part of the step (41), and the gland (6) is fixedly connected with the valve cover (4) through screws (13).

6. A gate valve according to claim 5, characterized in that the outer walls of the upper and lower ends of the valve plate (3) are conical surfaces (31), the number of the sealing rings (7) is two and the sealing rings are respectively embedded on the corresponding conical surfaces (31), and the two sealing surfaces of the valve body (1) are conical surfaces matched with the corresponding conical surfaces (31).

7. A gate valve according to claim 6, characterized in that an O-ring II (14) is arranged between the valve cover (4) and the valve body (1), and a packing seal (15) sealed on the valve rod (2) is embedded in the inner wall of the lower part of the step (41) of the valve cover (4).