초록 ▼

A fluid valve with a single shaft-sealing module is disclosed. The single shaft-sealing module allows the annular shaft sealing rings to be squeezed to slightly deform to prevent gaps being formed between the shaft and the inner surface of the valve body, and facilitates easy clean and/or replacemen

A fluid valve with a single shaft-sealing module is disclosed. The single shaft-sealing module allows the annular shaft sealing rings to be squeezed to slightly deform to prevent gaps being formed between the shaft and the inner surface of the valve body, and facilitates easy clean and/or replacement of the worn shaft sealing rings.

대표청구항 ▼

1. A fluid valve comprising a valve body, a shaft, and a valve disc, the valve body having a first hollow space to accommodate the shaft and a second hollow space to accommodate the valve disc, the second hollow space being located below the first hollow space and in communication with the first hol

1. A fluid valve comprising a valve body, a shaft, and a valve disc, the valve body having a first hollow space to accommodate the shaft and a second hollow space to accommodate the valve disc, the second hollow space being located below the first hollow space and in communication with the first hollow space, the shaft vertically penetrating the valve disc to drive the valve disc to rotate, wherein the fluid valve further comprises: a single shaft-sealing module entirely disposed inside the first hollow space to surround the shaft, comprising: a carrier being a first columnar body formed with a third hollow space between an inner wall of the first columnar body, one opening at a topmost end of the first columnar body and one opening at a bottommost end of the first columnar body, the inner wall of the first columnar body being formed with a first annular protruding portion at the bottommost end of the first columnar body, the carrier being detachable with respect to the valve body and entirely disposed inside the first hollow space to surround the shaft;a bushing being a second columnar body formed with a second annular protruding portion at a topmost end of an external side surface of the second columnar body, disposed inside the third hollow space of the carrier at a bottom with the second annular protruding portion being seated on the first annular protruding portion, a bottommost end of the second columnar body extending beyond the bottommost end of the first columnar body of the carrier;a plurality of first annular shaft seal rings being non-metal and seated on the topmost end of the second columnar body of the bushing to seal the shaft;a first annular shaft ring being metallic and seated on the plurality of first annular shaft seal rings;a first annular wave spring being metallic and seated on the first annular shaft ring;a second annular shaft ring being metallic and seated on the first annular wave spring; anda plurality of second annular shaft seal rings being non-metal and seated on the second annular shaft ring;wherein the first hollow space is columnar and gradually narrowed from a topmost end of the first hollow space; the topmost end of the first columnar body of the carrier is beneath the topmost end of the first hollow space; the first annular wave spring is formed with a continuously wave-shaped contour and a plurality of convex portions and a plurality of concave portions on a same plane in an offset manner, the convex portions and the concave portions have a same number in quantity, and the convex portions contact a bottommost surface of the second annular shaft ring while the concave portions contact a topmost surface of the first annular shaft ring; all of the bushing, the plurality of first annular shaft seal rings, the first annular shaft ring, the first annular wave spring, the second annular shaft ring, and the plurality of second annular shaft seal rings together surround a space to accommodate the shaft; at least the plurality of first annular shaft seal rings and the plurality of second annular shaft seal rings provide sealing between the shaft and the inner wall of the first columnar body of the carrier; and a lateral loading on a topmost end of the plurality of first annular shaft seal rings and a lateral loading on a bottommost end of the plurality of second annular shaft seal rings are substantially equal. 2. The fluid valve of claim 1, wherein the fluid valve further comprises an annular cap disposed on top of the single shaft-sealing module to cover the topmost end opening of the first columnar body of the carrier to restrict the bushing, the plurality of first annular shaft seal rings, the first annular shaft ring, the first annular wave spring, the second annular shaft ring, and the plurality of second annular shaft seal rings inside the carrier, and, wherein the shaft penetrates the annular cap. 3. The fluid valve of claim 2, wherein the fluid valve further comprises two sets of springs disposed on top of the annular cap in an axially symmetrical manner. 4. The fluid valve of claim 3, wherein the two sets of springs are disc-shaped. 5. The fluid valve of claim 1, wherein one of the first annular shaft ring and the second annular shaft ring provides sealing between the shaft and the inner wall of the first columnar body of the carrier. 6. The fluid valve of claim 5, wherein an inner surface of one of the first annular shaft ring and the second annular shaft ring is formed with a first annular groove, and an outer surface of one of the first annular shaft ring and the second annular shaft ring is formed with a second annular groove, and the first annular groove, and the second annular groove each is embedded with an O-ring. 7. The fluid valve of claim 5, wherein one of the first annular shaft ring and the second annular shaft ring is formed with a protrusion at a central part of a bottommost end and two shoulders at two side edges of a bottommost end, respectively. 8. The fluid valve of claim 1, wherein the carrier has an L shape cross section. 9. The fluid valve of claim 1, wherein the bushing and the carrier are one-piece made of metallic materials. 10. The fluid valve of claim 1, wherein an inner surface of the valve body surrounding the first hollow space is formed with a plurality of shoulders to fit a shape of the single shaft-sealing module, and at least one of the shoulders near a region where the second hollow space in communication with the first hollow space is provided with a seal ring to avoid fluid leakage between the single shaft-sealing module and the valve body. 11. The fluid valve of claim 1, wherein the convex portions and the concave portions are four to eight in number. 12. The fluid valve of claim 1, the plurality of first annular shaft seal rings, the first annular shaft ring, the first annular wave spring, the second annular shaft ring, and the plurality of second annular shaft seal ring have a same inner diameter. 13. The fluid valve of claim 1, wherein a ratio of a height of the bushing to a height of all the plurality of first annular shaft seal rings, the first annular shaft ring, the first annular wave spring, the second annular shaft ring, and the plurality of second annular shaft seal rings ranges from 1:2.5 to 1:3.5. 14. The fluid valve of claim 13, wherein a ratio of the height of the bushing to a height of the carrier ranges from 1:3 to 1:4. 15. The fluid valve of claim 1, wherein the fluid valve is a valve selected from a group consisting of a globe valve, a ball valve, and a butterfly valve. 16. The fluid valve of claim 1, wherein the first annular shaft seal rings and the second annular shaft seal rings are made of soft non-metal materials while the first annular shaft ring, the second annular shaft ring, and the first annular spring are made of metallic materials. 17. The fluid valve of claim 16, wherein the soft non-metal materials include graphite and PTFE. 18. The fluid valve of claim 16, wherein the first annular shaft ring and the second annular shaft ring are made of stainless steel, and the first annular spring is made of alloy. 19. The fluid valve of claim 16, wherein the first annular shaft ring and the second annular shaft ring are made of SAE 304 stainless steel. 20. The fluid valve of claim 16, wherein the first annular spring is made of INCONEL alloy.