High-pressure two-way hard sealing semi-ball valve with automatic pollution discharge function

Abstract

The utility model relates to a high-pressure two-way hard sealing semi-ball valve with an automatic pollution discharge function, which comprises a valve body, a valve seat, a valve cover, a valve rod, a semi-ball body and a transmission device, the semi-ball body is composed of a semi-ball table and a ball clack, only the ball clack needs to be replaced after a sealing surface is abraded, and materials are saved; the blow-down impeller is arranged between the hemispheroid lower boss and the bottom of the valve cavity, when the valve is opened, the blow-down impeller is driven to rotate, sediment at the bottom of the valve cavity is automatically discharged, and abrasion of a sealing face in the opening and closing process is reduced. The utility model has the advantages of good sealing performance, long service life, low maintenance cost and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the valve field especially relates to a high pressure two -way hard sealing half ball valve. BACKGROUND

[0002] Half ball valve is widely used in high temperature, high pressure, wear resistance medium conveying pipeline's control valve because of simple structure, open and close conveniently, such as the single valve seat two -way sealing half ball valve of patent number CN201820809813.9 that the company applies, including valve body, valve seat, valve cover, valve rod, half sphere, transmission device, the valve seat is installed in the valve body export passage by the stop ring, constitutes floating type valve seat, the half sphere upper and lower ends have the upper valve shaft and lower valve shaft of the connection, the dynamic cooperation is installed in the shaft hole of valve cover and valve body, has two -way sealing performance, can be replaced or repaired on line, the advantages such as good middle cavity sealing performance. Its main shortcomings are: when the valve is closed for a long time, the medium impurities will be accumulated in the valve cavity bottom, when the valve is opened, the sealing surface of the half sphere will be worn, which affects the sealing performance; after the sealing surface of the half sphere is worn, the half sphere needs to be replaced as a whole, which causes great waste of materials and high maintenance cost. SUMMARY

[0003] The utility model provides a high pressure two -way hard sealing half ball valve with automatic blowdown function that can automatically remove the deposits in the valve cavity when the valve is opened, reduce the wear of the sealing surface, has good sealing performance, long service life of the product and low maintenance cost, aiming at the shortcomings of the prior art.

[0004] The technical scheme of the utility model is realized as follows:

[0005] A high pressure two -way hard sealing half ball valve with automatic blowdown function, comprising a valve body, a valve seat, a valve cover, a valve rod, a half sphere and a transmission device, the valve body has an inlet passage, an outlet passage and a middle cavity mounting port, the diameter of the middle cavity mounting port is greater than the outer diameter of the valve seat, the valve seat is single, installed in the outlet passage of the valve body, the outer circular surface of the valve seat is dynamically sealed with the inner wall of the valve body passage, forming a floating valve seat, the valve cover is installed on the upper end of the middle cavity mounting port of the valve body, the valve rod is composed of an upper valve rod and a lower valve rod, the upper end of the upper valve rod passes through the shaft hole in the center of the valve cover and is connected with the transmission device, the lower end is fixedly connected with the center hole of the upper boss of the half sphere, the upper end of the lower valve rod is sleeved in the center hole of the lower boss of the half sphere, and the lower end is sleeved in the positioning hole at the bottom of the valve cavity; characterized in that: the half sphere is composed of a half sphere platform and a ball petal movably installed on the half sphere platform, the spherical surface of the ball petal is provided with a spherical sealing surface matched with the valve seat; the center line of the valve rod and the center line of the valve body passage have an eccentric distance, the eccentric distance is located in front of the rotation direction of the half sphere when the valve is closed; a blowdown impeller is arranged between the lower boss of the half sphere and the bottom of the valve cavity.

[0006] In the above technical scheme, a plurality of elastic connection buckles are uniformly arranged in the circumferential direction between the outer circumference of the ball petal and the half sphere platform.

[0007] In the above technical solution, the upper and lower bosses of the hemisphere cooperate with the shaft hole of the valve cover and the positioning hole at the bottom of the valve cavity to form a radial positioning structure.

[0008] In the above technical solutions, the spherical sealing surface of the spherical lobe is formed by overlaying a wear-resistant alloy onto a cast iron substrate to create an annular spherical sealing surface.

[0009] Compared with the prior art, the advantages of this invention are that the hemispherical body is composed of a hemispherical platform and a ball petal, so only the ball petal needs to be replaced after the sealing surface wears, saving materials; a drain impeller is set between the lower boss of the hemispherical body and the bottom of the valve cavity. When the valve is opened, the drain impeller rotates, automatically discharging the deposits at the bottom of the valve cavity, reducing wear on the sealing surface during opening and closing. It has advantages such as good sealing performance, long product service life, and low maintenance costs. Attached Figure Description

[0010] Figure 1 This is a structural cross-sectional view of the present invention.

[0011] Figure 2 This is a utility model Figure 1 The right view.

[0012] In the diagram: 1 Valve body, 2 Lower bushing, 3 Bottom cover, 4 Lower valve stem, 5 Lower boss, 6 Sewage discharge impeller, 7 Hemispherical platform, 8 Elastic snap, 9 Sealing ring, 10 Valve seat, 11 Upper bushing, 12 Ball disc, 13 Sealing ring, 14 Upper valve stem, 15 Packing, 16 Annular spherical sealing surface, 17 Valve cover, 18 Transmission device, 19 Bracket, 20 Upper boss. Detailed Implementation

[0013] like Figure 1The high-pressure bidirectional hard sealing half ball valve with automatic blowdown function shown comprises a valve body 1, a valve seat 10, a valve cover 17, a valve stem, a half ball body, a transmission device 18, the valve body 1 has an inlet channel, an outlet channel and a middle cavity mounting port, the diameter of the middle cavity mounting port is larger than the outer diameter of the valve seat 10, the valve seat 10 and the half ball body can be installed or removed from the middle cavity mounting port, forming an upper-mounted structure, the valve seat 10 is a single valve seat and is installed in the outlet channel of the valve body 1, the outer circular surface of the valve seat 10 is in dynamic sealing cooperation with the inner wall of the channel of the valve body 1, forming a floating valve seat structure, the reverse medium pressure pushes the valve seat 10 and the half ball body to be tightly sealed, realizing the bidirectional sealing function, a sealing ring 9 is arranged between the outer circular surface of the valve seat 10 and the inner wall of the channel of the valve body 1, the valve cover 17 is installed on the upper end of the middle cavity mounting port of the valve body 1, the valve stem is composed of an upper valve stem 14 and a lower valve stem 4, the upper end of the upper valve stem 14 penetrates through the shaft hole in the center of the valve cover 17 and is connected with the transmission device 18, the lower end is fixedly connected with the center hole of an upper boss 20 of the half ball body, the transmission device 18 is fixedly installed on the upper end of the valve cover 17 through a support 19, the upper end of the lower valve stem 4 is sleeved in the center hole of a lower boss 5 of the half ball body, the lower end is sleeved in a positioning hole at the bottom of the valve cavity, and the lower end of the positioning hole is sealed and packaged by a bottom cover 3; characterized in that: the half ball body is composed of a half ball table 7 and a ball petal 12 movably installed on the half ball table 7, the ball petal 12 can axially float on the half ball table 7, the half ball table 7 can be made of cast iron, under the condition of ensuring the performance of the sealing surface of the ball petal 12, the manufacturing cost of the half ball body is greatly reduced, and when the sealing surface of the half ball body is worn, only the ball petal 12 needs to be replaced, reducing the maintenance cost, the ball petal 12 has a spherical sealing surface which cooperates with the valve seat 10; the valve stem center line and the channel center line of the valve body 1 have an eccentricity H, the eccentricity H is located in front of the rotating direction of the half ball body when the valve is closed, that is, when the half ball body rotates clockwise, the valve stem center line is located in front of the channel center line of the valve body 1, as shown in Figure 2 the valve stem center line is located on the left side of the channel center line of the valve body 1, during the closing process of the valve, the sealing surface of the ball petal 12 and the sealing surface of the valve seat 10 are gradually wedged and sealed, when the valve is opened, the sealing surface of the ball petal 12 and the sealing surface of the valve seat 10 are instantaneously separated, reducing the wear between the sealing surfaces, improving the sealing performance and the service life of the product; a blowdown impeller 6 is arranged between the lower boss 5 of the half ball body and the bottom of the valve cavity, the blowdown impeller 6 is fixedly connected with the lower boss 5, and the blowdown impeller 6 is rotated when the half ball body rotates, thereby automatically removing the sundries deposited at the bottom of the valve cavity.

[0014] a plurality of elastic connection buckles 8 are uniformly arranged between the outer circumference of the ball petal 12 and the half ball table 7 in the circumferential direction, limiting the axial movement of the ball petal 12 on the half ball table 7 and preventing the ball petal 12 from falling off the half ball table 7.

[0015] The upper boss 20 and the lower boss 5 of the semi-sphere are respectively matched with the shaft hole of the valve cover 17 and the positioning hole of the bottom of the valve cavity to form a radial positioning structure, that is, the upper boss 20 and the shaft hole of the valve cover 17 and the lower boss 5 and the positioning hole of the bottom of the valve cavity are respectively matched to form a radial positioning mechanism, so that the semi-sphere boss and the valve rod are prevented from being displaced by reverse pressure, the sealing performance of the sealing pair and the middle cavity is affected, the upper shaft sleeve 11 is arranged between the outer circular surface of the upper boss 20 and the shaft hole of the valve cover 17, the lower shaft sleeve 2 is arranged between the outer circular surface of the lower boss 5 and the positioning hole of the bottom of the valve cavity, the rotating friction is reduced, the sealing ring 13 and the packing 15 are arranged between the outer circular surface of the upper valve rod 14 and the shaft hole of the valve cover 17 to form a double sealing structure, and the sealing performance of the middle cavity is improved.

[0016] The spherical sealing surface of the ball valve 12 is formed by welding wear-resistant alloy on the cast iron base material, and then grinding to form an annular spherical sealing surface 16, so that the manufacturing cost of the ball valve 12 is reduced.

[0017] The directionality words such as "upper", "lower", "left" and "right" in the utility model are only for the orientation in the drawings for the purpose of description, and cannot be understood as the limitation of the utility model.

Claims

1. A high-pressure bidirectional hard sealing half ball valve with automatic blowdown function, comprising a valve body (1), a valve seat (10), a valve cover (17), a valve stem, a half ball, a transmission device (18), the valve body (1) having an inlet channel, an outlet channel and a middle cavity mounting port, the diameter of the middle cavity mounting port being larger than the outer diameter of the valve seat (10), the valve seat (10) being a single valve seat installed in the outlet channel of the valve body (1), the outer circular surface of the valve seat (10) being in dynamic sealing cooperation with the inner wall of the channel of the valve body (1) to form a floating valve seat structure, the valve cover (17) being installed on the upper end of the middle cavity mounting port of the valve body (1), the valve stem being composed of an upper valve stem (14) and a lower valve stem (4), the upper end of the upper valve stem (14) penetrating through the shaft hole in the center of the valve cover (17) and being connected with the transmission device (18), the lower end being fixedly connected with the center hole of the upper boss (20) of the half ball, the upper end of the lower valve stem (4) being sleeved in the center hole of the lower boss (5) of the half ball, and the lower end being sleeved in the positioning hole at the bottom of the valve cavity; characterized in that: The semi-sphere is composed of a semi-sphere base (7) and a ball petal (12) movably installed on the semi-sphere base (7), the ball petal (12) has a spherical sealing surface matched with the valve seat (10); the valve rod center line and the valve body (1) channel center line have an eccentricity (H), the eccentricity (H) is located in front of the semi-sphere rotation direction when the valve is closed; a blow-off impeller (6) is arranged between the semi-sphere lower boss (5) and the valve cavity bottom, the blow-off impeller (6) is fixedly connected with the lower boss (5).

2. The high pressure bidirectional hard sealing half ball valve with automatic blowdown function according to claim 1, characterized in that in A plurality of elastic connection buckles (8) are uniformly arranged between the outer circumference of the ball petal (12) and the semi-sphere base (7) in the circumferential direction.

3. The high-pressure bidirectional hard-seal half-ball valve with automatic blowdown function according to claim 2, characterized in that: The upper boss (20) and the lower boss (5) of the semi-sphere are respectively matched with the shaft hole of the valve cover (17) and the positioning hole of the valve cavity bottom to form a radial positioning structure.

4. The high-pressure bidirectional hard-seal half-ball valve with automatic blowdown function according to claim 1 or 2 or 3, characterized in that: The spherical sealing surface of the ball petal (12) is an annular spherical sealing surface (16) of a wear-resistant alloy built up on a cast iron base material.

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