Flow restrictor

• US 8,167,002 B2
• Filed: 11/13/2008
• Issued: 05/01/2012
• Est. Priority Date: 11/15/2007
• Status: Expired due to Fees

• Current Assignee: Belimo Holding AG
• Original Assignee: Belimo Holding AG
• Inventors: Kuhne, Jorg, Pulli, Pino, Keller, Urs
• Primary Examiner(s): Brinson, Patrick F
• Application Number:
  US12/742,128
• Publication Number:
  US 20100319784A1
• Time in Patent Office: 1,265 Days
• Field of Search: 138/45, 138/46, 137/507, 137/517
• US Class Current: 138/45
• CPC Class Codes: G05D 7/0113 the sensing element acting as a valve
• CPC Class Codes: G05D 7/012 the sensing element being deformable and acting as a valve
• CPC Class Codes: Y10T 137/0379 By fluid pressure
• CPC Class Codes: Y10T 137/7792 Movable deflector or choke
• CPC Class Codes: Y10T 137/7837 Direct response valves [i.e., check valve type]
• CPC Class Codes: Y10T 137/7869 Biased open

Abstract

The invention relates to a flow restrictor (1) for restricting a volume flow through a liquid line, said flow restrictor comprising a support (10) having a passage and a bent flat spring (11) attached to the support (10). The flat spring (11) comprises at least one spring tab (12) and the passage at least one opening (13), the spring tab (12) and the opening (13) having a substantially identical extension along a longitudinal direction. The spring tab (12) is designed and arranged above the opening (13) in such a manner that it increasingly rests against the support (10) with increasing differential pressure, thereby gradually making the opening (13) smaller and continuously reducing the passage within a defined pressure range. The dimensions of the opening (13) are adjusted corresponding to the size of the spring tab (12), thereby allowing a compact flow restrictor (1) which is less susceptible to dirt. The continuous reduction of the passage allows an increase in vibration resistance of the flow restrictor (1).

Claims

1. A flow restrictor (1) for limiting a volume flow through a liquid line (2), comprising:

a carrier (10) with a passage and a bent flat form spring (11) which is attached to the carrier (10) and which is designed to be flattened increasingly with a rising differential pressure (Δ

p),

wherein, the flat form spring (11) has at least one spring tongue (12, 17, 19),

wherein, the passage comprises at least two orifices (13, 18) lying next to one another, the spring tongue (12, 17, 19) and the orifices (13, 18) having an essentially identical extent in each case in a longitudinal direction,

wherein, the carrier (10) comprises at least one web (14) which in each case separates two orifices (13, 18) lying next to one another from one another, and

wherein, each spring tongue (12, 19) is configured and arranged above the orifices (13, 18) so that, with a rising differential pressure (Δ

p), said spring tongue increasingly lies upon the web (14) and continuously reduces the orifices (13, 18), in order to reduce the passage continuously within a defined pressure range, the orifices (18) remaining open in defined remaining regions.

2. The flow restrictor (1) as claimed in claim 1, wherein the flat form spring (11) is fastened to an outer marginal region of the carrier (10), and in that the at least two orifices (13, 18) extend from the outer marginal region, where the flat form spring (11) is fastened, as far as the opposite outer marginal and region of the carrier (10).

3. The flow restrictor (1) as claimed in claim 1, wherein the passage comprises a plurality of rotationally symmetrically arranged orifices (18), and in that the flat form spring (11) comprises a plurality of rotationally symmetrically arranged spring tongues (17, 19) which are in each case arranged so that, with a rising differential pressure (Δ

p), they lie increasingly upon the assigned webs (14) and continuously reduce the orifices (18).

4. The flow restrictor (1) as claimed in claim 3, wherein the spring tongues (19) are fastened to an outer marginal region of the carrier (10).

5. The flow restrictor (1) as claimed in claim 3, wherein the spring tongues (17) are fastened in the center (Z) of the carrier (10).

6. The flow restrictor (1) as claimed in claim 1, wherein the spring tongue (17) is arranged above the orifices (13, 18) so that, with a rising differential pressure (Δ

p), it also lies increasingly upon the side regions bordering the orifices (13, 18).

7. The flow restrictor (1) as claimed in claim 1, wherein the carrier (10) is configured as a round disk which comprises, on the outer marginal region, an erected collar (15) for insertion into a pipe line.

8. The flow restrictor (1) as claimed in claim 7, wherein part of the collar (15) is bent back onto the disk and clamps the flat form spring (11) to the carrier (10).

10. The flow restrictor (1) as claimed in claim 2, wherein the spring tongue (17) is arranged above the orifices (13, 18) so that, with a rising differential pressure (Δ

p), it also lies increasingly upon the side regions bordering the orifices (13, 18).

11. The flow restrictor (1) as claimed in claim 3, wherein the spring tongue (17) is arranged above the orifices (13, 18) so that, with a rising differential pressure (Δ

p), it also lies increasingly upon the side regions bordering the orifices (13, 18).

12. The flow restrictor (1) as claimed in claim 4, wherein the spring tongue (17) is arranged above the orifices (13, 18) so that, with a rising differential pressure (Δ

p), it also lies increasingly upon the side regions bordering the orifices (13, 18).

13. The flow restrictor (1) as claimed in claim 5, wherein the spring tongue (17) is arranged above the orifices (13, 18) so that, with a rising differential pressure (Δ

p), it also lies increasingly upon the side regions bordering the orifices (13, 18).

14. The flow restrictor (1) as claimed in claim 2, wherein the carrier (10) is configured as a round disk which comprises, on the outer marginal region, an erected collar (15) for insertion into a pipe line.

15. The flow restrictor (1) as claimed in claim 3, wherein the carrier (10) is configured as a round disk which comprises, on the outer marginal region, an erected collar (15) for insertion into a pipe line.

16. The flow restrictor (1) as claimed in claim 4, wherein the carrier (10) is configured as a round disk which comprises, on the outer marginal region, an erected collar (15) for insertion into a pipe line.

17. The flow restrictor (1) as claimed in claim 5, wherein the carrier (10) is configured as a round disk which comprises, on the outer marginal region, an erected collar (15) for insertion into a pipe line.

18. The flow restrictor (1) as claimed in claim 6, wherein the carrier (10) is configured as a round disk which comprises, on the outer marginal region, an erected collar (15) for insertion into a pipe line.

19. The flow restrictor (1) as claimed in claim 14, wherein part of the collar (15) is bent back onto the disk and clamps the flat form spring (11) to the carrier (10).

20. The flow restrictor (1) as claimed in claim 15, wherein part of the collar (15) is bent back onto the disk and clamps the flat form spring (11) to the carrier (10).

9. A method for limiting a volume flow through a liquid line (2), comprising:

attaching a bent flat form spring (11) to a carrier (10) with a passage, and

flattening the flat form spring (11) increasingly with a rising differential pressure (Δ

p),

wherein, the flat form spring (11) is provided with at least one spring tongue (12, 17, 19) and the passage is provided with at least two orifices (13, 18) lying next to one another, the spring tongue (12, 17, 19) and the orifices (13, 18) being configured with an essentially identical extent in each case in a longitudinal direction,

wherein, the carrier (10) comprises at least one web (14) which in each case separates two orifices (13, 18) lying next to one another from one another, and

wherein, each spring tongue (12, 19) is configured and arranged above the orifices (13, 18) so that, with a rising differential pressure (Δ

p), said spring tongue lies increasingly upon the web (14) and continuously reduces the orifices (13, 18), in order to reduce the passage continuously within a defined pressure range, the orifices (18) remaining open in defined remaining regions.