GB2109271A - Pulsating liquid jet apparatus - Google Patents
Pulsating liquid jet apparatus Download PDFInfo
- Publication number
- GB2109271A GB2109271A GB08233623A GB8233623A GB2109271A GB 2109271 A GB2109271 A GB 2109271A GB 08233623 A GB08233623 A GB 08233623A GB 8233623 A GB8233623 A GB 8233623A GB 2109271 A GB2109271 A GB 2109271A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nozzle
- pipe
- liquid jet
- pressure
- high pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
- B05B12/06—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for effecting pulsating flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/049—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes having self-contained propelling means for moving the cleaning devices along the pipes, i.e. self-propelled
- B08B9/0495—Nozzles propelled by fluid jets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
- B08B2203/0205—Bypass pressure relief valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The apparatus is suitable for cleaning a pipe by a nozzle (18) which is forced through the pipe by liquid pressure. High pressure pump 10 has its outlet 12 and inlet 22 interconnected by bypass line 20 in which is disposed a pilot valve 26 normally held closed by a spring 36 whose action is opposed by liquid pressure from a hydropneumatic accumulator 30 whose liquid side is also connected by way of a variable restriction 28 to high pressure output line 14 leading to a flexible high pressure hose 16 having a jet nozzle 18. This arrangement ensures that liquid emerges at the nozzle(s) 18 as high pressure jets, directed both in the forward and reverse directions so that when the nozzle is introduced into the pipe (e.g. a drainage pipe) the jets will progress the nozzle(s) 18 and the following flexible hose 16, through the pipe. <IMAGE>
Description
SPECIFICATION
Pulsating liquid jet apparatus
This invention concerns pulsating liquid jet apparatus.
The use of high pressure water for the cleaning of blocked and silted drainage or other pipes is a well known and widely used technique. The method generally employed is to supply water, at high pressure, through a length of flexible high pressure hose attached to the downstream end of which is a nozzle with a number of jets through which the water exits at high velocity. This nozzle is introduced into the drainage or other pipe to be cleared and the arrangement of the jets is such that water ejected rearwards acts both to propel the nozzle and hose forwards and also to scour the walls of the pipe. If the pipe is known to be seriously blocked, a forward facing jet may also be a feature of the nozzle in order to blast a way through the obstruction.Using this technique with a variety of nozzles, hoses, and water flow and pressure variables, it is possible to penetrate blocked and heavily silted drains, up to about 100 metres (about 300 feet) in length, purely by the self-propelling action of the nozzle attached to the end of the high pressure hose. Such a penetration length is generally adequate for most industrial, municipal and highway applications due to the provision of regular manhole access.
A relatively new application of the technique is in the cleaning and maintenance of land drainage systems where it is not uncommon to find drainage pipes extending to lengths of up to about 600 metres (about 2000 feet). In order to achieve this length of penetration, which is desirable in order 20 to avoid having to dig up the drainage line to gain access at intermediate points, some other technique must be employed. It is a known principle that if the flow of the nozzle is interrupted on a regular cyclic basis causing a pulsating action the nozzle and hose will continue to progress into the pipe beyond the point which can be achieved by the steady pull obtained from rear facing jets alone.
Interruption of the flow to the nozzle may be brought about in a number of ways at least one of which is currently available commercially. This involves the selective by-passing of flow from one cylinder of a three-cylinder piston pump.
An object of the present invention is to provide a form of apparatus operative to generate a pulsating jet of liquid, such as water, suitable for use in the cleaning of pipes as above discussed, which apparatus is of relatively simple construction involving primarily components which are readily available commercially.
With this object in view, the present invention provides pulsating liquid jet apparatus comprising a high pressure pump the inlet and outlet of which are connected by a by-pass wherein is a valve by which flow through the by-pass can be controlled, the outlet being connected by way of a flexible hose to one or more jet nozzles, and a pressure accumulator being connected by way of a restriction with the outlet and serving to supply control pressure to the valve cyclically to open and close the latter thereby to provide for the production of a pulsating liquid jet at the nozzle(s).
The invention further provides, of course, a method of cleaning a drainage or like pipe using pulsating liquid jet apparatus as aforesaid which comprises introducing, into the pipe, the hose and nozzle(s) of the apparatus, and operating the pump, thereby to generate a pulsating liquid jet at the nozzle(s) so as to clean the pipe and cause the hose and nozzle(s) to progress therethrough.
The invention will be described further, by way of example, with reference to the accompanying drawing, in which the single figure is a schematic diagram illustrating a preferred embodiment of the pulsating liquid jet apparatus of the invention.
In the apparatus illustrated in the drawing, a high pressure pump 10, preferably but not exclusively a piston-type pump, is used to force water, by way of its outlet 12, into a high-pressure delivery line 14 which connects to a flexible high pressure hose, indicated very diagrammatically by a zig-zag line at 16, at the downstream end of which are one or more nozzles as indicated at 18. Connected to the high pressure delivery line 14 at points relatively close to the pump outlet 12 are a full bore by-pass line 20 which connects back to inlets 22 of the pump 10 and a pilot connection line 24. The by-pass line 20 is normally closed by a two-position spring-biased pilot operated valve 26 which is illustrated as a shuttle-type valve, but may be any suitable form of pressure-actuated valve.
The pilot connection line 24 is connected by way of a variable restrictor 28 to the fluid side of a gas-filled diaphragm-type pressure accumulator 30 sometime known as a hydropneumatic accumulator. The pressure on the accumulator side of the restrictor 28 is applied by line 32 to pilot port 34 of the twoposition valve 26.
The method of operation of the apparatus is as follows. Assuming the pump inlet 22 to be con necked to a water supply and the pump 10 operating, as the flow from the pump 10 rises to a maximum, the pressure in the delivery line 14 rises to the operating level determined by the characteristic of the nozzle(s) 18.
This pressure level operative in the delivery line 4 causes liquid to flow through the restrictor 28 to charge the accumulator 30 and consequently raising the pressure downstream of the restrictor 28 i.e. the pressure applied to the pilot port 34. When the pressure applied to the valve 26 by way of the port 34 reaches the level at which spring 36 of the valve 26 is overcome, the valve 26 changes over from its illustrated closed condition to an open condition in which the by-pass line 20 is opened. The pump output is then free to circulate on no load. Conse quentlythe pressure in the delivery line 14 drops.
The pressure in pilot connection line 24 between the restrictor 28 and the accumulator 30 is now higher than the pressure in the line 24 at the other side of the restrictor 28. This causes the accumulator 30 to discharge back through the restrictor 30 and the pressure apparent at the pilot port 34 to fall. When this pressure has fallen to a level at which the spring 36 can become dominant, the valve 26 changes back to its illustrated closed condition. The cycle then
begins again as full pump flow is directed to pass through the nozzle(s) 18 causing the pressure in the delivery line 14to rise again.
The frequency and amplitude of the cyclic
pressureflow variations may be controlled by the
relative settings of the spring 36 and the variable
restrictor 28.
Typical operating values would be:
Pump fixed output - about 68 litres (15 gallons) per minute
Maximum steady line pressure- about 175 kg. sq.
cm (about 2500 psi)
Cyclic pressure range- 35 to 105 kg. sq. cm (about 500 to 1500 psi)
Frequency- 50 to 150 cycles per minute
Pilot pressure operating level - 70 to 85 kg. sq. cm (approx. 1000 to 1200 psi)
It will readily be understood that the steady flow from the pump 10 and nozzle(s) 18 is interrupted by the opening and closing of the by-pass line 20 automatically on a cyclic basis. The resulting pulsating action may be employed to cause the nozzle(s)
18 attached to the downstream end of the high pressure hose 16 to penetrate into a drainage or other pipe (not shown) over distances far in excess of what may be achieved by conventional self propelling action derived from a non-pulsating flow at the nozzle(s) 18.
Naturally, the invention is not confined to the precise details of the illustrated example and variations may be made thereto within the scope of the following claims. Naturally the use of the apparatus is not confined to water, and it can be employed with other liquids required to be ejected in a pulsating manner.
Claims (7)
1. Pulsating liquid jet apparatus comprising a high pressure pump the inlet and outlet of which are connected by a by-pass wherein is a valve by which flow through the by-pass can be controlled, the outlet being connected by way of a flexible hose to one or more jet nozzles, and a pressure accumulator being connected by way of a restriction with the outlet and serving to supply control pressure to the valve cyclically to open and close the latter thereby to provideforthe production of a pulsating liquid jet at the nozzle(s).
2. Apparatus as claimed in claim 1 wherein the valve is a pilot valve spring-loaded into a closed position in which the by-pass is closed for the entire pump output to pass to the nozzle(s).
3. Apparatus as claimed in claim 1 or wherein the pressure accumulator is a hydropneumatic accumulator.
4. Apparatus as claimed in claim 1,2 or 3 in which the restriction is variable.
5. Pulsating liquid jet apparatus substantially as hereinbefore described with reference to an as illustrated in the accompanying drawing.
6. A method of cleaning a drainage or like pipe using pulsating liquid jet apparatus as defined in any of claims 1 to 5, which comprises introducing, into the pipe, the hose and nozzle(s) of the apparatus; and operating the pump, thereby to generate a pulsating liquid jet at the nozzle(s) so as to clean the pipe and cause the hose and nozzle(s) to progress therethrough.
7. A method of cleaning a drainage or like pipe substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08233623A GB2109271B (en) | 1981-11-25 | 1982-11-25 | Pulsating liquid jet apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8135606 | 1981-11-25 | ||
GB08233623A GB2109271B (en) | 1981-11-25 | 1982-11-25 | Pulsating liquid jet apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2109271A true GB2109271A (en) | 1983-06-02 |
GB2109271B GB2109271B (en) | 1985-05-22 |
Family
ID=26281377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08233623A Expired GB2109271B (en) | 1981-11-25 | 1982-11-25 | Pulsating liquid jet apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2109271B (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0255947A2 (en) * | 1986-08-07 | 1988-02-17 | Dr. Fehr GmbH | Device for producing a pulsating jet of liquid |
WO1988006925A1 (en) * | 1987-03-11 | 1988-09-22 | Institutet För Verkstadsteknisk Forskning | A device for application of a liquid or plastic substance |
FR2656383A1 (en) * | 1989-12-27 | 1991-06-28 | Leau Yves | Method for pumping liquid, and its application for high-pressure cleaning |
EP0448944A1 (en) * | 1990-03-26 | 1991-10-02 | Lonza Ag | Method and device for intervalwise spraying of a suspension of lubricant |
EP0469907A2 (en) * | 1990-08-02 | 1992-02-05 | SPARTAN TOOL (a division of HEICO, INC.) | Pulsating liquid jet apparatus |
GB2415059A (en) * | 2004-06-09 | 2005-12-14 | Bluewater Energy Services Bv | Self-contained hydraulic pulsations valve |
DE102008037247A1 (en) * | 2008-08-09 | 2010-02-11 | Dürr Ecoclean GmbH | Apparatus and method for generating a pulsed jet of liquid fluid |
CN104841656A (en) * | 2014-07-10 | 2015-08-19 | 北汽福田汽车股份有限公司 | Cleaning water circuit system and concrete pumping device with same |
US20220055080A1 (en) * | 2020-08-18 | 2022-02-24 | Shawn Bennett | Rechargeable high power washer and jetter |
IT202200002957A1 (en) * | 2022-02-17 | 2023-08-17 | P T C S R L | HYDRAULIC CIRCUIT WITH PUSHING EFFECT |
-
1982
- 1982-11-25 GB GB08233623A patent/GB2109271B/en not_active Expired
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0255947A2 (en) * | 1986-08-07 | 1988-02-17 | Dr. Fehr GmbH | Device for producing a pulsating jet of liquid |
EP0255947A3 (en) * | 1986-08-07 | 1989-06-28 | Dr. Fehr GmbH | Device for producing a pulsating jet of liquid |
WO1988006925A1 (en) * | 1987-03-11 | 1988-09-22 | Institutet För Verkstadsteknisk Forskning | A device for application of a liquid or plastic substance |
FR2656383A1 (en) * | 1989-12-27 | 1991-06-28 | Leau Yves | Method for pumping liquid, and its application for high-pressure cleaning |
EP0448944A1 (en) * | 1990-03-26 | 1991-10-02 | Lonza Ag | Method and device for intervalwise spraying of a suspension of lubricant |
US5205488A (en) * | 1990-03-26 | 1993-04-27 | Lonza Ltd. | Process and device for spraying a liquid intermittently, especially a lubricant suspension to be sprayed under high pressure |
EP0469907A3 (en) * | 1990-08-02 | 1992-05-06 | Spartan Tool (A Division Of Heico, Inc.) | Pulsating liquid jet apparatus |
EP0469907A2 (en) * | 1990-08-02 | 1992-02-05 | SPARTAN TOOL (a division of HEICO, INC.) | Pulsating liquid jet apparatus |
GB2415059A (en) * | 2004-06-09 | 2005-12-14 | Bluewater Energy Services Bv | Self-contained hydraulic pulsations valve |
DE102008037247A1 (en) * | 2008-08-09 | 2010-02-11 | Dürr Ecoclean GmbH | Apparatus and method for generating a pulsed jet of liquid fluid |
WO2010018007A1 (en) * | 2008-08-09 | 2010-02-18 | Dürr Ecoclean GmbH | Device and method for prodcing a pulsed jet of a liquid fluid |
US8702872B2 (en) | 2008-08-09 | 2014-04-22 | Dürr Ecoclean GmbH | Device and process for generating a pulsed jet of a liquid fluid |
CN104841656A (en) * | 2014-07-10 | 2015-08-19 | 北汽福田汽车股份有限公司 | Cleaning water circuit system and concrete pumping device with same |
US20220055080A1 (en) * | 2020-08-18 | 2022-02-24 | Shawn Bennett | Rechargeable high power washer and jetter |
IT202200002957A1 (en) * | 2022-02-17 | 2023-08-17 | P T C S R L | HYDRAULIC CIRCUIT WITH PUSHING EFFECT |
Also Published As
Publication number | Publication date |
---|---|
GB2109271B (en) | 1985-05-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |