Pressure compensating drip irrigation hose

• US 20030150940A1
• Filed: 02/08/2002
• Published: 08/14/2003
• Est. Priority Date: 02/08/2002
• Status: Active Grant

• Current Assignee: Toro Company (Toro)
• Original Assignee: Toro Company (Toro)
• Inventors: Taylor, William C. Jr., Vildibill, Jeffrey A.
• Granted Patent: US 6,736,337 B2
• Time in Patent Office: Days
• US Class Current: 239/542
• CPC Class Codes: A01G 25/023 Dispensing fittings for drip irrigation, e.g. drippers
• CPC Class Codes: Y02A 40/22 Improving land use; Improving water use or availability; Controlling erosion
• CPC Class Codes: Y02P 60/21 Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures

Abstract

A pressure compensated drip irrigation hose (20) includes a hose having a wall (21) with an inner surface (21a). A continuous elastomeric strip member (30) is connected to the inner surface (21a). The continuous elastomeric strip member (30) and inner surface (21a) form a plurality of emitters. The emitters have an inlet section (40), a pressure reducing section (60) which is downstream from the inlet section (40). A pressure responsive section (70) is downstream from the pressure reducing section (60) and the outlet section (80) is downstream from the pressure responsive section (70). The continuous elastomeric strip member (30) is constructed from a material softer than the wall (21).

Claims

1. A pressure compensating drip irrigation hose for distributing water comprising:

a) a hose having a wall with an inner surface, the inner surface defining a main water passage;

b) a continuous elastomeric strip member operatively connected to the inner surface, the continuous elastomeric strip member and the inner surface defining a plurality of emitter units, the continuous elastomeric strip member having a bottom wall operatively connected to first and second spaced elongated side members, the bottom wall, sides and inner surface defining an emitter water passageway;

c) each emitter unit comprising;

i) an inlet, wherein water from the main water passageway enters the emitter unit through the inlet;

ii) a pressure reducing section downstream from the inlet, wherein water flowing through the emitter is slowed and water pressure is reduced; and

iii) a pressure responsive section downstream from the pressure reducing section, wherein with increased pressure in the main water passage, the bottom wall deflects toward the inner surface, thereby decreasing a size of the emitter water passageway; and

d) an outlet formed in the hose wall, the outlet in fluid communication with the emitter water passageway and downstream from the pressure responsive section.

2. The hose of claim 1, each emitter unit farther comprising an outlet section downstream from the pressure reducing section, a plurality of first preformed members operatively connected to the bottom wall to maintain a constant distance between the bottom wall and the inner surface, the outlet formed over the outlet section.

3. The hose of claim 2, wherein the outlet comprises a plurality of orifices, the orifices spaced longitudinally along the hose.

4. The hose of claim 1, wherein the inlet having openings with a cross-sectional flow path sized smaller than a cross-section of the emitter water passageway, wherein the openings act as a filter.

5. The hose of claim 1, the pressure reducing section having a plurality of second preformed members, the second preformed members operatively connected to both the bottom wall and the inner surface, thereby making the pressure reducing section more resistant to deflection.

6. The hose of claim 5, wherein the second preformed members having a stepped profile, whereby more turbulence is created.

7. The hose of claim 1, the inlet further comprising a plurality of spaced members operatively connected to the bottom wall and the inner surface, thereby acting both as openings for the inlet and a stiffening member of the inlet to make the inlet more resistant to deflection.

8. The hose of claim 7, the inlet further comprising a longitudinal reinforcement member operatively connected to both the bottom wall and the inner surface, thereby making the inlet more resistant to deflection.

9. The hose of claim 5, wherein the second preforms having a stepped profile, whereby more turbulence is created.

10. The hose of claim 1, wherein the bottom wall has a first thickness for the pressure responsive section and a second thickness for outlet section, the first thickness less than the second thickness.

11. The hose of claim 10, wherein the first thickness is at least about 0.008 inches and the elastomeric member is constructed from a thermoplastic vulcanizate material.

12. The hose of claim 11, wherein the first thickness is at least about 0.008 inches.

13. A pressure compensating drip irrigation hose for distributing water comprising:

a) a hose having a wall with an inner surface, the inner surface defining a main water passage;

b) a continuous elastomeric strip member having a hardness less than that of the hose, the continuous elastomeric strip member operatively connected to the inner surface, defining an emitter water passageway;

c) each emitter unit comprising;

i) an inlet, wherein water from the main water passageway enters the emitter unit through the inlet;

ii) a pressure reducing section, wherein water flowing through the emitter is slowed and water pressure is reduced; and

iii) a pressure responsive section, wherein with increased pressure in the main water passage, the bottom wall deflects toward the inner surface, thereby decreasing a size of the emitter water passageway;

d) an outlet formed in the hose wall, the outlet in fluid communication with the emitter water passageway;

e) a plurality of first preformed members formed in the outlet section, whereby the pressure responsive section is more sensitive to pressure than the outlet section; and

f) a plurality of second preformed members formed in the pressure reducing section, whereby the pressure reducing section is less responsive to pressure than the pressure responsive section.

14. The hose of claim 13, each emitter unit further comprising an outlet section downstream from the pressure reducing section, a plurality of first preformed members operatively connected to the bottom wall to maintain a constant distance between the bottom wall and the inner surface, the outlet formed over the outlet section.

15. The hose of claim 14, wherein the outlet comprises a plurality of orifices, the orifices spaced longitudinally along the hose.

16. The hose of claim 13, wherein the inlet having openings with a cross-sectional flow path sized smaller than a cross-section of the emitter water passageway, wherein the openings act as a filter.

17. The hose of claim 13, the pressure reducing section having a plurality of second preformed members, the second preformed members operatively connected to both the bottom wall and the inner surface, thereby making the pressure reducing section more resistant to deflection.

18. The hose of claim 13, the inlet further comprising a plurality of spaced members operatively connected to the bottom wall and the inner surface, thereby acting both as openings for the inlet and a stiffening member of the inlet to make the inlet more resistant to deflection.

19. The hose of claim 18, the inlet further comprising a longitudinal reinforcement member operatively connected to both the bottom wall and the inner surface, thereby making the inlet more resistant to deflection.

20. The hose of claim 17, wherein the second preforms having a stepped profile, whereby more turbulence is created.

21. The hose of claim 13, wherein the bottom wall has a first thickness for the pressure responsive section and a second thickness for outlet section, the first thickness less than the second thickness.

22. The hose of claim 21, wherein the first thickness is at least about 0.008 inches and the elastomeric member is constructed from a thermoplastic vulcanizate material.

23. The hose of claim 21, wherein the first thickness is at least about 0.008 inches.