CN112108274A

CN112108274A - Improved pick-up flush sprayer for shear cylinder

Info

Publication number: CN112108274A
Application number: CN202010564193.9A
Authority: CN
Inventors: 乔尔·贝克; 马修·史密斯
Original assignee: Engineering And Industrial Solutions Group Ltd
Current assignee: Engineering And Industrial Solutions Group Ltd
Priority date: 2019-06-21
Filing date: 2020-06-19
Publication date: 2020-12-22
Also published as: AU2020203722A1

Abstract

A pick-up flush sprayer includes a nozzle configured to engage a sprayer body in use to receive a flow of water from the sprayer body via an inlet of the nozzle. The nozzle has a central bore and at least one helical bore at least partially surrounding the central bore and connecting the inlet and outlet of the nozzle.

Description

Improved pick-up flush sprayer for shear cylinder

Technical Field

The present invention relates generally to a pick-up flush sprayer for a shear drum such as used in coal mining.

Background

The rotating shear drum has a plurality of radial pick-up assemblies for shearing a coal face or the like. Each assembly includes a hardened radial tool pick (typically 130mm in length with a tungsten carbide tip) held in a tool holder by a retaining pin. The pick-up flush sprayer directs a conical water spray to surround the radial tool pick-up head end, which is used primarily for ignition control and dust suppression.

A paper published in 11.1993 entitled "controlling frictional ignition on Coal mining machines (Shearer)" in British Coal, Codes & Rules "sets forth several requirements for determining whether a pick-up flush sprayer is suitable for ignition control. Reference is made herein to the pick-up flush nebulizer of pages 29 to 32.

Referring to fig. 1, uk coal requires a pick-up flush (PBF) sprayer suitable for ignition control, including:

a. all PBF sprayer nozzles should form a consistent solid cone.

b. The maximum spray width (W) and length (L) should be measured on a plane set at the highest point (reference X-X) of the steel body of the pick-up shown in fig. 1.

c. The leading edge of the atomizer should pass at least through and preferably at the base of the carbonized head end on the leading edge of the picking member, below point a in fig. 1.

d. The length of the sprayer behind the pick-up (L1) should exceed 40 mm.

e. The width of the spray at point B across datum X-X should be greater than twice the maximum width of the pick-up steel body measured across the seat of the carbide tip.

f. An ignition controlled sprayer supplied at a pressure in the range of 7 to 19bar should be considered acceptable when:

and (4) acceptance standard:

σP0.3≥12

wherein:

spray Density (L/s/m)²)

P ═ atomizer nozzle pressure, minimum 7, maximum 19(bar)

Spray density:

σ＝Q×10615πWL

wherein:

q ═ water flow (liter/minute)

W is the maximum spray width (mm)

L is the maximum spray length (mm)

An ideal design configuration for a pick-up flush sprayer is one that meets the above requirements while reducing water waste.

The present invention seeks to provide an improved pick-up flush nebulizer which will overcome or substantially ameliorate at least some of the disadvantages of the prior art, or at least provide an alternative.

It will be understood that, if any prior art information is referred to herein, such reference does not constitute an admission that the information forms part of the common general knowledge in the art in australia or any other country.

Disclosure of Invention

Referring to fig. 2, a prior art pick-up flush nebulizer 100 comprises a nebulizer body 101 having an inlet 124, the inlet 124 leading via a longitudinal bore 109 to a tangential bore 108, the tangential bore 108 defining an outlet 104 at a distal face thereof.

The tangential bore 108 includes an inlet 110 into which the nozzle piece 103 is inserted and retained. The nozzle member 103 includes a head 111 that seals the inlet 110. The nozzle member 103 includes a central bore 106 coaxially aligned with the outlet 104.

The nozzle member 103 includes an orthogonal inlet 105 to a central bore 106, and a portion of the water flow from the longitudinal bore 109 flows through the longitudinal bore 106 to the outlet 104.

The remainder of the water flow from the longitudinal bore 109 escapes annularly between the side of the nozzle member 103 and the interior of the central bore 106. The nozzle member 103 includes swirl vanes 107 which swirl the annular water stream towards the outlet 104.

We have found that the prior art pick-up flush sprayer 100 is problematic at least because the tolerances of the insertion of the nozzle member 103 within the tangential bore 108 introduce variations to the conical waterjet characteristics described above which are difficult to control and which can lead to water wastage.

Accordingly, there is provided a pick-up flush sprayer comprising a nozzle configured to engage a sprayer body in use to receive a flow of water from the sprayer body via an inlet of the nozzle.

The nozzle includes a central bore and at least one internal helical bore at least partially surrounding the central bore and connecting the inlet and outlet of the nozzle. In a preferred embodiment, the helical bore comprises a dual start first helical bore and a second helical bore.

In a preferred embodiment, the central hole and the spiral hole are formed by a 3D printing process, preferably a metal 3D printing process.

The current arrangement of the nozzle being retained within the nebuliser body to discharge a conical body of water from the outlet of the nozzle, and the internal arrangement of the central and helical apertures reduces or at least substantially eliminates the tolerance variability of the problems of the prior art pick-up flush nebuliser systems, which may allow precise control of the characteristics of the conical spray and reduce manufacturing variability, allowing water to be saved in use.

Other aspects of the invention are also disclosed.

Drawings

Preferred embodiments of the present disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which:

figure 1 shows a pick-up flush nebulizer geometry for compliance calculation;

figure 2 shows a pick-up flush sprayer according to the prior art;

fig. 3 shows a side transparent view of a nozzle for a pick-up flush sprayer according to an embodiment;

FIG. 4 shows a cross-sectional view of the nozzle of FIG. 3;

FIG. 5 illustrates a sprayer body for engaging the nozzle of FIG. 3, according to an embodiment;

fig. 6 and 7 provide exemplary embodiments of the nozzle of fig. 3 and the sprayer body of fig. 5, according to embodiments.

Detailed Description

The nozzle 115 is configured to engage the sprayer body 113 to receive a flow of water therefrom.

The sprayer body 113 is generally longitudinal and includes a longitudinal bore 114 leading from the water inlet 130 to the nozzle-retaining chamber 122. The nozzle-holding chamber 122 may widen at a mouth 123. The nozzle 115 is configured to be inserted into the nozzle-holding chamber 122.

The nozzle 115 may include threads 133 that screw into threads (not shown) of the nozzle-retaining chamber 122.

The nozzle 115 may include a head 124 defining a rearward annular edge 132 that may seal against a corresponding annular edge of the mouth 123. In an embodiment, the O-ring may interface with the rearward annular rim 132 and the annular rim of the mouthpiece 123.

The nozzle 115 includes an inlet 125 to receive a flow of water from the longitudinal bore 114 via the nozzle-holding chamber 122. The nozzle holding chamber 122 may include a relief 126 to allow water to flow behind the nozzle 115 into its inlet 125.

The nozzle 115 may include coaxial opposing insertion tool tine engagement holes 116 that may be engaged, in use, with the tines of an insertion tool to screw the nozzle 115 into the nozzle holding chamber 122.

The nozzle 115 includes a central bore 119 leading from the inlet 125 to the outlet 131. The nozzle 115 further includes at least one helical bore 118 at least partially surrounding the central bore 119 and connecting the inlet 125 and the outlet 131.

In a preferred embodiment, the nozzle 115 includes a first helical bore 118A and a second helical bore 118B.

Referring to fig. 4, the nozzle 115 may include an inlet stage chamber 117 introduced from an inlet 125. The inlet stage chamber 117 may have an inlet end face 127 that funnels coaxially into the central bore 119.

The first and second

helical bores

118A, 118B may start tangentially from the inlet end face 127 at opposite adjacent inlets 121 and through the inlet end face 127 on either side of the central bore 119. In an embodiment, the inlet end face 127 may be substantially frustoconical.

The central bore 119 and the spiral bore 118 may meet at an outlet stage chamber 120. The outlet stage chamber 120 may have an outlet end face 128 that is funneled toward an outlet 131.

The outlet stage chamber 120 may include an inlet end face 129. In this regard, the helical bore 118 may be tangentially introduced to intersect the inlet end face 129 at a respective entrance opposite and adjacent to the central bore 119. The outlet end face 128 may be substantially frustoconical. Further, the inlet end face 129 may be planar.

The nozzle 115 is preferably metallic. The nozzle 115 is preferably manufactured by a metal 3D printing process.

Fig. 6 and 7 provide exemplary dimensions.

In an embodiment, the inlet end face 127 includes an arc of approximately 90 °. In an embodiment, the outlet end face 128 includes an arc of approximately 90 °. Further, each helical bore 118 may include a diameter approximately equal to the diameter of the central bore 119.

Each helical hole may be rotated 180 °.

As used herein, unless otherwise noted, the term "about" or similar terms should be construed as being within 10% of the stated value.

The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the invention. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the invention. Thus, the foregoing descriptions of specific embodiments of the present invention are presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, since obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the following claims and their equivalents define the scope of the invention.

Claims

1. A pick-up flush sprayer comprising a nozzle configured to engage, in use, a sprayer body to receive a flow of water from the sprayer body via an inlet of the nozzle, the nozzle comprising a central bore and at least one helical bore at least partially surrounding the central bore and connecting the inlet and outlet of the nozzle.

2. The sprayer of claim 1, wherein the at least one helical bore comprises a first helical bore and a second helical bore.

3. A sprayer according to claim 2, wherein the nozzle comprises an inlet stage chamber leading from the inlet, the inlet stage chamber having an inlet end face coaxially funneled into the central bore, and wherein the first and second helical bores start tangentially from the inlet end face opposite the central bore.

4. A sprayer according to claim 3, wherein the inlet end face is frusto-conical.

5. A sprayer according to claim 2, wherein the nozzle comprises an outlet stage chamber leading to the outlet, the outlet stage chamber having an inlet end face and an outlet end face funneled to the outlet, and wherein the first and second helical bores are introduced tangentially to the inlet end face opposite the central bore.

6. A sprayer according to claim 5, wherein the outlet end face is frusto-conical.

7. A sprayer according to claim 1, wherein the nozzle comprises a head defining a rear annular edge.

8. A sprayer according to claim 7, wherein the nozzle comprises threads for engaging threads of a nozzle-retaining chamber of the sprayer body.

9. A sprayer according to claim 3, wherein the inlet end face comprises an arc of about 90 °.

10. A sprayer according to claim 5, wherein the outlet end face comprises an arc of about 90 °.

11. A sprayer according to claim 2, wherein each helical aperture is rotated 180 °.

12. A sprayer according to claim 1, wherein the nozzle includes coaxially opposed insertion tool tine engagement apertures.

13. The sprayer of claim 1 further comprising a sprayer body, and wherein the nozzle is configured to engage an open nozzle-retaining chamber of the sprayer body.

14. A sprayer according to claim 13, wherein the sprayer body includes a longitudinal bore leading from the inlet to the nozzle-holding chamber, and wherein the nozzle inlet, in use, interfaces with the nozzle-holding chamber to receive a flow of water via the longitudinal bore.

15. A sprayer according to claim 14, wherein the nozzle comprises threads for engaging threads of the nozzle-holding chamber.

16. A sprayer according to claim 15, wherein the nozzle-holding chamber comprises an escape at the nozzle inlet.

17. A sprayer according to claim 14, wherein the nozzle comprises a head defining a rear annular rim, and wherein the nozzle-holding chamber widens to a mouth at the annular periphery.