Durable high-airtightness ball valve

Abstract

The durable high-airtightness ball valve comprises a main valve body, an upper valve rod and a valve ball, a valve cavity is formed in the main valve body, a side valve body is detachably arranged on one side of the main valve body, a flow channel is formed in the side valve body, a scraper is detachably arranged in the flow channel, a positioning groove is formed in the inner end of the side valve body, and the valve ball is arranged in the positioning groove. A positioning groove is formed in the side valve body, a positioning block is detachably arranged in the positioning groove, an air bag mounting groove is formed between the positioning block and the scraper, an air bag is arranged in the air bag mounting groove, an air inlet connector is locally arranged on the side valve body, a control valve is arranged on the air inlet connector, and the inner end of the air inlet connector is communicated with the air bag. The air bag is inflated after being filled with air, and sealing is formed between the local position of the outer surface of the air bag and the sealing face of the valve ball after the air bag is inflated. According to the technical scheme, the structure design is reasonable, the manufacturing cost is low, the service life is long, the sealing performance is good, and the device can be suitable for particle medium blowing or gas medium particle dust working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline valves, and in particular to a durable and highly airtight ball valve. Background Art

[0002] The discharge valve is mainly used for bottom discharge, discharge, sampling and dead zone-free shut-off operations of reactors, storage tanks and other containers.

[0003] The existing discharge valve structure still has shortcomings: (1) The flow channel of the existing discharge valve is a non-cylindrical flow channel, which is easy to be bumped by the falling harder particles, causing valve damage, short service life and metal particles generated by the bumping, which will affect the purity of the medium; (2) The sealing surface of the soft-sealed ball valve for granular media is easily scratched and cannot be used for a long time; (3) The hard-sealed ball valve has high requirements for the sealing surface, high manufacturing cost and even slight scratches can easily cause leakage, short service life and poor practicality.

[0004] Therefore, the existing discharge valve structure is not suitable for the working conditions of blowing granular media or gas media with granular dust. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a durable and highly airtight ball valve with reasonable structural design, low manufacturing cost, long service life, good sealing performance, and suitable for blowing granular media or gas media with granular dust.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a durable and highly airtight ball valve, comprising a main valve body, an upper valve stem and a valve ball, wherein a valve cavity is arranged in the main valve body, the valve ball is installed in the valve cavity, a valve stem mounting through hole is arranged on the main valve body, the lower end of the upper valve stem is connected and fixed with the upper end of the valve ball after passing through the valve stem mounting through hole, a side valve body is detachably arranged on one side of the main valve body, a flow channel is arranged in the side valve body, a scraper is detachably arranged in the flow channel, a positioning groove is arranged at the inner end of the side valve body, a positioning block is detachably arranged in the positioning groove, an airbag mounting groove is arranged between the positioning block and the scraper, an airbag is arranged in the airbag mounting groove, an air intake joint is partially arranged on the side valve body, a control valve is arranged on the air intake joint, and the inner end of the air intake joint is connected with the airbag; the airbag expands after being filled with gas, and a seal is formed between a local position of the outer surface of the airbag and the sealing surface of the valve ball after the airbag expands.

[0007] The present invention is further configured as follows: a connecting protrusion is provided on the inner wall surface of the flow channel, a plurality of bolt through holes are provided on the connecting protrusion, a first bolt is provided in each bolt through hole, the scraper and the connecting protrusion are locked and fixed by the first bolt, and the head of the scraper is tightly fitted with the outer surface of the valve ball.

[0008] The present invention is further configured as follows: the inner end of the scraper presses the outer end of the airbag, a second bolt is provided on the positioning block, a fixing screw hole is provided in the positioning groove, the positioning block is locked and fixed by the second bolt, and the positioning block presses the inner end of the airbag.

[0009] The present invention is further configured as follows: a bracket is provided at the upper end of the valve stem mounting through hole, and the bracket is fixed to the upper end of the main valve body by bolts; a valve stem through hole is provided in the bracket, a first grease injection groove is provided on one side of the valve stem through hole, a first grease injection through hole is provided on one side of the first grease injection groove, and a first grease injection device is fixedly provided on the outer end of the first grease injection through hole.

[0010] The present invention is further configured as follows: a bottom hole is provided at the bottom of the valve cavity, a bottom cover is provided in the bottom hole, the bottom cover is fixed to the main valve body by bolts, a valve stem positioning groove is provided at the inner end of the bottom cover, a lower valve stem is provided in the valve stem positioning groove, and the upper end of the lower valve stem is connected to the lower end of the valve ball.

[0011] The present invention is further configured as follows: the valve ball is a hemispherical body, an upper valve stem connecting groove is provided at the upper end of the valve ball, a lower valve stem connecting groove is provided at the lower end of the valve ball, the lower end of the upper valve stem is inserted into the upper valve stem connecting groove, and the lower end of the upper valve stem and the upper end of the valve ball are locked and fixed by a first transmission member; the upper end of the lower valve stem is inserted into the lower valve stem connecting groove, and the upper end of the lower valve stem and the lower end of the valve ball are locked and fixed by a second transmission member; the first transmission member and the second transmission member are both cylindrical pins, keys or flat squares.

[0012] The present invention is further configured as follows: a first sealing member is provided between the upper end of the main valve body and the bracket, a second sealing member and a dustproof member are provided between the valve stem mounting through hole and the upper valve stem, the first sealing member and the second sealing member are both metal wound gaskets, polytetrafluoroethylene wound gaskets or metal toothed gaskets; the dustproof member is a graphite ring, a polytetrafluoroethylene ring, a plastic ring, a rubber ring or a metal ring.

[0013] The present invention is further configured such that: the scraper is pressed against the outer surface of the valve ball by gravity or is pushed toward the outer surface of the valve ball by an elastic element.

[0014] The present invention is further configured as follows: an actuator is provided at the upper end of the upper valve stem, the lower end of the actuator is fixed to the upper end of the bracket by bolts, the actuator drives the upper valve stem to move, and the upper valve stem drives the valve ball to open and close.

[0015] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention has a reasonable structural design, and adopts an inflatable airbag sealed ball valve with a scraper structure, and its main function is to discharge materials or open and close pipelines. The valve switch is operated by an actuator. After the hemisphere is closed in place, the airbag is inflated, and after the inflation is completed, the airbag is sealed against the hemisphere. The valve is completely closed and the valve is airtight with zero leakage, and the granular medium and the gas are completely sealed. The hemisphere is in close contact with the scraper, and the material is always in the flow channel through the influence of the scraper and gravity, and does not enter the airbag accessories, thereby avoiding scratches on the airbag. It is suitable for working conditions where granular media are blown or gas media are accompanied by granular dust. It has low manufacturing cost, long service life, and good sealing performance. It is suitable for working conditions where granular media are blown or gas media are accompanied by granular dust, and has good practicality.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 It is a structural schematic diagram of the closed position of the airbag in the inflated state according to an embodiment of the present invention; Figure 3 for Figure 2 The enlarged schematic diagram of the middle part I; Figure 4 It is a schematic diagram of the partial structure of the airbag in the uninflated state in the embodiment of the present invention; Figure 5 It is a schematic diagram of the partial structure of the airbag in the closed position in the uninflated state according to the embodiment of the present invention; Figure 6 It is a schematic diagram of the partial structure of the closed position of the airbag in the inflated state according to the embodiment of the present invention; Figure 7 Schematic diagram of the scraper principle of an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In the description of this embodiment, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as limiting the present invention. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] See also Figures 1 to 7The present invention discloses a durable and highly airtight ball valve, comprising a main valve body 1, an upper valve stem 2 and a valve ball 3. The main valve body 1 is provided with a valve cavity 11, and the valve ball 3 is installed in the valve cavity 11. The main valve body 1 is provided with a valve stem installation through hole, and the lower end of the upper valve stem 2 is connected and fixed to the upper end of the valve ball 3 after passing through the valve stem installation through hole. A side valve body 4 is detachably provided on one side of the main valve body 1, and a flow channel 41 is provided in the side valve body 4, and a scraper 5 is detachably provided in the flow channel 41. The side valve body 4 is provided with a positioning groove at the inner end, a positioning block 6 is detachably provided in the positioning groove, an airbag mounting groove is provided between the positioning block 6 and the scraper 5, an airbag 7 is provided in the airbag mounting groove, an air inlet connector 8 is partially provided on the side valve body 4, a control valve is provided on the air inlet connector 8, and the inner end of the air inlet connector 8 is connected with the airbag 7; the airbag 7 expands after being filled with gas, and a seal is formed between the local position of the outer surface of the airbag and the sealing surface of the valve ball 3 after the airbag 7 expands.

[0020] Preferably, the main valve body 1 and the side valve body 4 are fixed by bolt connection; a valve seat can be installed on the positioning block 6; and the flow channel 41 is a cylindrical flow channel.

[0021] In order to make the structural design of the present invention more reasonable, as a preference, a connecting protrusion 42 is provided on the inner wall surface of the flow channel 41 in this embodiment, and a plurality of bolt through holes are provided on the connecting protrusion 42, and a first bolt 9 is provided in each bolt through hole. The scraper 5 is locked and fixed to the connecting protrusion 42 by the first bolt 9, and the head of the scraper 5 is tightly fitted with the outer surface of the valve ball 3.

[0022] The connecting protrusion 42 is arranged in an annular shape, and the number of the bolt through holes is 2-6.

[0023] Preferably, the inner end of the scraper 5 presses the outer end of the airbag 7, a second bolt is provided on the positioning block 6, a fixing screw hole is provided in the positioning groove, the positioning block 6 is locked and fixed by the second bolt, and the positioning block 6 presses the inner end of the airbag 7.

[0024] The side valve body 4 is provided with a ventilation groove 43 aligned with the airbag mounting groove position, the ventilation groove 43 is connected with the air inlet connector 8, the airbag 7 is bonded and fixed to the inner wall surface of the airbag mounting groove, and the connection between the airbag 7 and the inner wall surface of the airbag mounting groove forms a seal, and the control valve is a solenoid valve or a pneumatic control valve.

[0025] A bracket 10 is provided at the upper end of the valve stem mounting through hole, and the bracket 10 is fixed to the upper end of the main valve body 1 by bolts; a valve stem through hole is provided in the bracket 10, a first grease injection groove 101 is provided on one side of the valve stem through hole, a first grease injection through hole 102 is provided on one side of the first grease injection groove 101, and a first grease injection device 12 is fixedly provided on the outer end of the first grease injection through hole 102.

[0026] The bottom of the valve cavity 11 is provided with a bottom hole, a bottom cover 13 is provided in the bottom hole, the bottom cover 13 is fixed to the main valve body 1 by bolts, the inner end of the bottom cover 13 is provided with a valve stem positioning groove, a lower valve stem 14 is provided in the valve stem positioning groove, and the upper end of the lower valve stem 14 is connected to the lower end of the valve ball 3. Preferably, a second grease injection groove is provided on one side of the valve stem positioning groove, a second grease injection through hole is provided on one side of the second grease injection groove, and a second grease injection device is fixedly provided on the outer end of the second grease injection through hole.

[0027] The valve ball 3 is a hemispherical body, and an upper valve stem connecting groove is provided at the upper end of the valve ball 3, and a lower valve stem connecting groove is provided at the lower end of the valve ball 3. The lower end of the upper valve stem 2 is inserted into the upper valve stem connecting groove, and the lower end of the upper valve stem 2 and the upper end of the valve ball 3 are locked and fixed by a first transmission member 15; the upper end of the lower valve stem 14 is inserted into the lower valve stem connecting groove, and the upper end of the lower valve stem 14 and the lower end of the valve ball 3 are locked and fixed by a second transmission member 16; the first transmission member 15 and the second transmission member 16 are both cylindrical pins, keys or flat squares.

[0028] A first seal 17 is arranged between the upper end of the main valve body 1 and the bracket 10, and a second seal 18 and a dustproof member 19 are arranged between the valve stem mounting hole and the upper valve stem 2. The first seal 17 and the second seal 18 are metal wound gaskets, polytetrafluoroethylene wound gaskets or metal toothed gaskets; the dustproof member 19 is a graphite ring, a polytetrafluoroethylene ring, a plastic ring, a rubber ring or a metal ring.

[0029] The scraper 5 is pressed against the outer surface of the valve ball by gravity or is pushed toward the outer surface of the valve ball 3 by an elastic element.

[0030] The upper end of the upper valve stem 2 is provided with an actuator 20, the lower end of the actuator 20 is fixed to the upper end of the bracket 10 by bolts, the actuator 20 drives the upper valve stem 2 to move, and the upper valve stem 2 drives the valve ball 3 to open and close. Preferably, the actuator 20 is a pneumatic actuator or an electric actuator.

[0031] Preferably, the main valve body 1 and the side valve body 4 are castings, forgings or welded plates. A flange is provided at a local position of the main valve body 1, and the flange can be connected to a pipeline or a barrel.

[0032] The scraper 5 is an annular structure and has a scraper angle, which keeps the granular medium at the scraper angle. Finally, the valve is closed and the granular medium falls downstream without entering the airbag cavity.

[0033] In actual application, when the valve is closed, the actuator 20 drives the upper valve stem 2 to move, thereby driving the valve ball 3 to the closed position. Then the solenoid valve or the air control valve is controlled to change position so that the air inlet connector 8 starts to take in air, and the gas fills the inside of the airbag 7 to expand it so that it fits the sealing surface of the valve ball 3 to achieve sealing; When the valve is opened, the electromagnetic valve or the air-controlled valve is switched to empty the air inlet joint 8, because the tension of the airbag 7 itself actively discharges the internal gas. The actuator 20 starts to work 5-10 seconds after the electromagnetic valve or the air-controlled valve is switched, driving the valve ball 3 to open, and finally the valve is opened. During the process, there is no friction between the airbag 7 and the valve ball 3.

[0034] The scraper 5 is pressed against the outer surface of the valve ball by gravity or pushed against the outer surface of the valve ball 3 by an elastic element, so that the scraper 5 and the valve ball 3 are always in close contact to prevent the granular medium from entering the airbag cavity. The scraper 5 has a scraper angle, which keeps the granular medium at the scraper angle. Finally, the valve is closed and the granular medium falls downstream without entering the airbag cavity.

[0035] The present invention adopts an inflatable airbag sealed ball valve with a scraper structure, and its main function is to discharge materials or open and close pipelines. The valve switch is operated by an actuator. After the hemisphere is closed in place, the airbag is inflated, and after the inflation is completed, the airbag is tightly sealed against the hemisphere. The valve is completely closed and the valve is airtight with zero leakage, and the granular medium and the gas are completely sealed. The hemisphere is in close contact with the scraper, and the material is always in the flow channel through the influence of the scraper and gravity, and does not enter the airbag accessories, thereby avoiding scratches on the airbag. It is suitable for working conditions where granular media are blown or gas media carry granular dust.

[0036] The valve uses upper and lower valve stems to fix the ball, which prevents the integral valve stem from passing through the flow channel and affecting the flow area. The upper and lower valve stems of the valve are designed with grease injection structures, which improve the sealing performance and also lubricate the valve stem. The bolted valve cover is convenient for valve assembly and commissioning, and is also conducive to later maintenance work. The seal can be an O-ring or a lip ring, which has a high sealing effect and little effect on the torque of the product.

[0037] Conventional discharge valves have non-cylindrical flow channels, which are prone to knocking against the falling of harder particles, causing valve damage, a short service life, and metal particles generated by knocking that affect the purity of the medium. The sealing surface of the soft-sealed ball valve for granular media is easily scratched and cannot be used for a long time. The hard-sealed ball valve has high requirements for the sealing surface, high manufacturing cost, and even a slight scratch can easily cause air leakage. Therefore, this durable and high-airtightness ball valve was invented for this special working condition. The product has good sealing effect, low torque, and long service life. It can reduce the cost of the valve actuator, reduce the product maintenance cost, and greatly reduce the product maintenance cycle.

[0038] The above technical solution has reasonable structural design, low manufacturing cost, long service life, good sealing performance, and is suitable for working conditions of blowing granular media or gas media with granular dust, and has good practicality. The specific description of the present invention in the above embodiment is only used to further illustrate the present invention and cannot be understood as limiting the protection scope of the present invention. Technical engineers in this field make some non-essential improvements and adjustments to the present invention based on the content of the above invention, which fall within the protection scope of the present invention.

Claims

1. A durable and highly airtight ball valve, comprising a main valve body (1), an upper valve stem (2) and a valve ball (3), wherein a valve cavity (11) is provided in the main valve body (1), the valve ball (3) is installed in the valve cavity (11), a valve stem installation through hole is provided on the main valve body (1), the lower end of the upper valve stem (2) passes through the valve stem installation through hole and is connected and fixed to the upper end of the valve ball (3), characterized in that: A side valve body (4) is detachably provided on one side of the main valve body (1), a flow channel (41) is provided in the side valve body (4), a scraper (5) is detachably provided in the flow channel (41), a positioning groove is provided at the inner end of the side valve body (4), a positioning block (6) is detachably provided in the positioning groove, an airbag mounting groove is provided between the positioning block (6) and the scraper (5), an airbag (7) is provided in the airbag mounting groove, an air intake connector (8) is partially provided on the side valve body (4), a control valve is provided on the air intake connector (8), and the inner end of the air intake connector (8) is connected to the airbag (7); the airbag (7) expands after being filled with gas, and after the airbag (7) expands, a seal is formed between a local position of the outer surface of the airbag and the sealing surface of the valve ball (3).

2. A durable and highly airtight ball valve according to claim 1, characterized in that: A connecting protrusion (42) is provided on the inner wall surface of the flow channel (41), and a plurality of bolt through holes are provided on the connecting protrusion (42). A first bolt (9) is provided in each bolt through hole. The scraper (5) and the connecting protrusion (42) are locked and fixed by the first bolt (9), and the head of the scraper (5) is tightly fitted with the outer surface of the valve ball (3).

3. A durable and highly airtight ball valve according to claim 2, characterized in that: The inner end of the scraper (5) presses the outer end of the airbag (7), the positioning block (6) is provided with a second bolt, a fixing screw hole is provided in the positioning groove, the positioning block (6) is locked and fixed by the second bolt, and the positioning block (6) presses the inner end of the airbag (7).

4. A durable and highly airtight ball valve according to claim 3, characterized in that: The side valve body (4) is provided with a ventilation groove (43) aligned with the position of the airbag installation groove, the ventilation groove (43) is communicated with the air inlet joint (8), the airbag (7) is bonded and fixed to the inner wall surface of the airbag installation groove, and the connection between the airbag (7) and the inner wall surface of the airbag installation groove forms a seal, and the control valve is a solenoid valve or a gas-controlled valve.

5. A durable and highly airtight ball valve according to claim 4, characterized in that: A bracket (10) is provided at the upper end of the valve stem mounting through hole, and the bracket (10) is fixed to the upper end of the main valve body (1) by bolts; a valve stem through hole is provided in the bracket (10), a first grease injection groove (101) is provided on one side of the valve stem through hole, a first grease injection through hole (102) is provided on one side of the first grease injection groove (101), and a first grease injection device (12) is fixedly provided at the outer end of the first grease injection through hole (102).

6. A durable and highly airtight ball valve according to claim 5, characterized in that: A bottom hole is provided at the bottom of the valve cavity (11), a bottom cover (13) is provided in the bottom hole, the bottom cover (13) is fixed to the main valve body (1) by bolts, a valve stem positioning groove is provided at the inner end of the bottom cover (13), a lower valve stem (14) is provided in the valve stem positioning groove, and the upper end of the lower valve stem (14) is connected to the lower end of the valve ball (3).

7. A durable and highly airtight ball valve according to claim 6, characterized in that: The valve ball (3) is a hemispherical body. An upper valve stem connecting groove is provided at the upper end of the valve ball (3), and a lower valve stem connecting groove is provided at the lower end of the valve ball (3). The lower end of the upper valve stem (2) is inserted into the upper valve stem connecting groove, and the lower end of the upper valve stem (2) and the upper end of the valve ball (3) are locked and fixed by a first transmission member (15); the upper end of the lower valve stem (14) is inserted into the lower valve stem connecting groove, and the upper end of the lower valve stem (14) and the lower end of the valve ball (3) are locked and fixed by a second transmission member (16); the first transmission member (15) and the second transmission member (19) are both cylindrical pins, keys or flat blocks.

8. A durable and highly airtight ball valve according to claim 7, characterized in that: A first sealing member (17) is provided between the upper end of the main valve body (1) and the bracket (10), and a second sealing member (18) and a dustproof member (19) are provided between the valve stem mounting through hole and the upper valve stem (2), wherein the first sealing member (17) and the second sealing member (18) are both metal spiral wound gaskets, polytetrafluoroethylene spiral wound gaskets or metal toothed gaskets; and the dustproof member (19) is a graphite ring, a polytetrafluoroethylene ring, a plastic ring, a rubber ring or a metal ring.

9. A durable and highly airtight ball valve according to claim 1 or 8, characterized in that: The scraper (5) is pressed against the outer surface of the valve ball by gravity or is pushed toward the outer surface of the valve ball (3) by an elastic element.

10. A durable and highly airtight ball valve according to claim 1 or 8, characterized in that: An actuator (20) is provided at the upper end of the upper valve stem (2), and the lower end of the actuator (20) is fixed to the upper end of the bracket (10) by bolts. The actuator (20) drives the upper valve stem (2) to move, and the upper valve stem (2) drives the valve ball (3) to open and close.

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