CN111043027A

CN111043027A - Distribution valve and pumping machine

Info

Publication number: CN111043027A
Application number: CN202010006434.8A
Authority: CN
Inventors: 章跃; 沈千里; 息树辛; 李明玉; 吴士平; 张杨
Original assignee: Xuzhou XCMG Schwing Machinery Co Ltd
Current assignee: Xuzhou XCMG Schwing Machinery Co Ltd
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2020-04-21
Also published as: WO2021135811A1; PH12021550274A1

Abstract

The present disclosure relates to a dispensing valve swingably mounted inside a hopper capable of transporting fluid materials, comprising: the skirt valve comprises a feeding hole, a discharging hole and a pumping cavity which is formed inside the skirt valve and communicated with the feeding hole and the discharging hole; the swing shaft is arranged on the outer side of the skirt valve, is rotatably connected to the hopper, can drive the skirt valve to swing relative to the hopper under the drive of the drive system, and is positioned on a plane vertical to the swing shaft, and the projection of the swing shaft is not superposed with the projection of the feeding port and the discharging port; wherein, the product of the area of the feeding hole and the distance from the centroid of the feeding hole to the swing shaft is equal to the product of the area of the discharging hole and the distance from the centroid of the discharging hole to the swing shaft. The embodiment of the disclosure can reduce the material accumulation phenomenon of concrete in the distribution valve, avoid frequent cleaning of blocked pipes, improve the stability of the movement of the distribution valve in the hopper, and ensure the service life of wearing parts in pumping machinery, thereby enabling the pumping process to be more stable and reliable and reducing the maintenance cost.

Description

Distribution valve and pumping machine

Technical Field

The disclosure relates to the field of pumping machinery, in particular to a distribution valve and pumping machinery.

Background

The pumping machine is a reciprocating carrier for conveying fluid materials, and wearing parts such as a wear plate, a cutting ring, a concrete piston, a concrete conveying cylinder, a valve body and the like in the pumping machine are wearing parts which are used for working in a severe environment and need to bear strong friction from concrete and strong corrosion from silicate in the working process and continuously circulate high-pressure impact load. Therefore, how to improve the stability of the concrete pumping machine in the construction process and reduce the maintenance cost of equipment is the key for prolonging the service life of the quick-wear part of the concrete pump.

The distribution valve in concrete pumping machinery is a key component of the whole pumping system, and the reciprocating motion of the distribution valve coordinates the actions of other mechanisms in the pumping machinery: in the first movement position, the distribution valve connects the first conveying cylinder with the conveying pipe to pump out concrete, and connects the second conveying cylinder with the hopper to pump in concrete; in the second movement position, the distribution valve connects the delivery cylinder moving to the stop point corresponding to the pumping-out position with the hopper to pump in the concrete, and connects the delivery cylinder moving to the stop point corresponding to the pumping-in position with the delivery pipe, so that the concrete pumped in is pumped out of the delivery pipe through the pumping-out stroke of the delivery cylinder.

Because the distribution valve realizes the switching connection between the two conveying cylinders and the conveying pipe, the working stability and the service life of the distribution valve directly influence the overall design and the service performance of the concrete pump, and the requirements on the reliability and the performance of a pumping system are higher and higher along with the improvement of the requirements of a construction party on the engineering quality, the progress and the like, while the existing distribution valve with the S valve or C valve structure form is difficult to simultaneously meet the requirements of good material suction and discharge performance, sealing performance, wear resistance, reversing flexibility and reliability and the like of the distribution valve.

Particularly, for the S valve or the C valve, because concrete needs to flow through a tortuous flow passage in the distribution valve, the flow resistance is large, and the material accumulation phenomenon is easily generated at the position with large curvature change in the S valve or the C valve, so that pipe blockage which is difficult to clean in time is caused, and the construction progress is seriously influenced. In addition, the S valve and the C valve are easy to have a movement instability phenomenon, which destroys the sealing connection relation between the distribution valve and the hopper, further influences the service life of a quick-wear part in the pumping machine, and makes the construction process difficult to maintain reliable operation for a long time.

Disclosure of Invention

In view of this, the embodiment of the present disclosure provides a distribution valve and a pumping machine, which can reduce the material accumulation phenomenon of concrete in the distribution valve, avoid frequent cleaning of blocked pipes, improve the stability of the movement of the distribution valve in a hopper, and ensure the service life of a wearing part in the pumping machine, so that the pumping process is more stable and reliable, and the maintenance cost is reduced.

In one aspect of the present disclosure, there is provided a dispensing valve swingably mounted inside a hopper capable of transporting fluid material, comprising:

the skirt valve comprises a feeding hole, a discharging hole and a pumping cavity which is formed inside the skirt valve and communicated with the feeding hole and the discharging hole; and

the swinging shaft is arranged outside the skirt valve, is rotatably connected to the hopper, can drive the skirt valve to swing relative to the hopper under the drive of the driving system, and has a projection which is not superposed with the projections of the feeding port and the discharging port on a plane vertical to the swinging shaft;

wherein, the product of the area of the feeding hole and the distance from the centroid of the feeding hole to the swing shaft is equal to the product of the area of the discharging hole and the distance from the centroid of the discharging hole to the swing shaft.

In some embodiments, the cross-sectional area of the pumping chamber in a cross-section perpendicular to the axis of oscillation varies uniformly between the inlet and outlet ports.

In some embodiments, the product of the cross-sectional area of any two pumping chambers perpendicular to the oscillation axis and located between the inlet and outlet ports and the distance from the centroid of the cross-sectional area to the oscillation axis is equal.

In some embodiments, the area of the feed port is less than the area of the discharge port.

In some embodiments, the skirt valve has a circular tube structure in a partial region close to the feed port, and has a skirt tube structure including a recessed region in a partial region close to the discharge port.

In some embodiments, the skirt tube structure has an elliptical cross-sectional shape perpendicular to the axis of oscillation, and the recessed region is formed by smoothly recessing the boundaries of the elliptical shape along the centroid of one of the short axes of the elliptical shape.

In some embodiments, the circular tube structure has a circular cross-sectional shape perpendicular to the oscillation axis, and a projection of the center of the circle on the ellipse passes through a straight line where the minor axis of the ellipse is located;

the position of the swing axis is configured to: the projection of the swing shaft on the ellipse passes through the straight line where the minor axis of the ellipse is located and is located on the side of the skirt-like tube structure near the recessed area.

In some embodiments, the skirt valve is provided with a first mounting ring and a second mounting ring for fixedly arranging the swing shaft, and the distribution valve further comprises:

and the clamping device is arranged between the first mounting ring and the second mounting ring and is positioned between the swinging shaft and the outer surface of the skirt valve, and the projection of the clamping device on a plane vertical to the swinging shaft is of a double-peak structure and is used for clamping the swinging shaft.

In some embodiments, the dispensing valve further comprises:

the first flow guide peak is fixedly arranged on the inner wall surface of one side, close to the concave area, of the skirt valve and protrudes towards the interior of the pumping cavity; and

the second flow guide peak is fixedly arranged on the inner wall surface of one side, away from the concave area, of the skirt valve and protrudes towards the interior of the pumping cavity;

the first flow guide peak and the second flow guide peak are not intersected with each other and are opposite in protruding direction, so that the pumping cavity is divided into a first flow channel and a second flow channel which are positioned on two sides of the protruding direction connecting line of the first flow guide peak and the second flow guide peak and are communicated with each other.

In some embodiments, the slope of the first flow guide peak relative to the pumping chamber wall is greater than the slope of the second flow guide peak relative to the pumping chamber wall.

In some embodiments, the hopper comprises a first pumping port and a second pumping port connected to the skirt valve feed port, the dispensing valve further comprising:

the at least two flow guide rib plates are fixedly arranged on the outer wall surface of one side of the skirt valve, which is far away from the recessed area, and the length direction of the flow guide rib plates is arranged between the inflow opening and the outflow opening;

wherein one of the at least two flow guide ribs is configured to: when the feed port is communicated with the first pumping port or the second pumping port, one of the at least two flow guide rib plates swings along with the skirt valve to a position closing a gap between the skirt valve and the hopper, and the second pumping port or the first pumping port is opened.

In some embodiments, the skirt structure has a wall thickness that increases toward the spout outlet.

In some embodiments, the dispensing valve further comprises:

and the wear-resistant layer is fixedly formed on at least part of the inner wall of the skirt valve, and the material strength of the wear-resistant layer is higher than that of the skirt valve.

In some embodiments, the projection of the distribution range of the wear-resistant layer on the inner wall of the skirt-shaped pipe on the plane vertical to the swinging shaft does not coincide with the projection of the inflow port on the plane vertical to the swinging shaft.

In one aspect of the present disclosure, there is provided a pumping machine comprising a dispensing valve as in any of the preceding embodiments.

Therefore, according to the embodiment of the disclosure, the advantages of small curvature change and gentle radian of the skirt valve flow channel are utilized, and the flow resistance of concrete in the pumping process is reduced; the feeding hole and the discharging hole of the skirt valve are offset on the oscillating shaft, the torque between the feeding hole and the discharging hole is the same, the feeding hole and the discharging hole of the skirt valve are stressed simultaneously to optimize the stress state of the skirt valve, and the skirt valve is more stable in the hopper, so that the service life of parts matched with the skirt valve is prolonged, and the maintenance cost of the distribution valve is reduced; utilize the structural feature of skirt valve, reduce the area of contact of concrete and skirt valve, reduce the wearing and tearing of skirt valve internal surface, set up the skirt valve into that the feed inlet is little and the discharge gate is big, be convenient for maintain and process skirt valve inside, increase the life-span of skirt valve.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a pumping machine according to some embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a dispensing valve according to some embodiments of the present disclosure;

FIG. 3 is a schematic structural view of a skirt valve and a swing shaft according to some embodiments of the present disclosure;

FIG. 4 is a schematic diagram of a prior art dispensing valve employing an S-valve;

FIG. 5 is a schematic structural view of an S-valve and a swing shaft in the prior art;

FIG. 6 is a schematic diagram of a prior art dispensing valve employing a C-valve;

FIG. 7 is a schematic diagram of a prior art C-valve;

FIG. 8 is a schematic structural view of a skirt valve according to some embodiments of the present disclosure;

FIG. 9 is a schematic structural view of an S-valve according to some embodiments of the present disclosure;

FIG. 10 is a schematic structural view of a C-valve according to some embodiments of the present disclosure;

FIG. 11 is a schematic structural view from the perspective of a skirt valve feed opening in accordance with some embodiments of the present disclosure;

FIG. 12 is a schematic structural view of a discharge outlet of a skirt valve according to some embodiments of the present disclosure;

FIG. 13 is a schematic structural view from the front of the skirt valve side according to some embodiments of the present disclosure;

FIG. 14 is a schematic structural view from the back of the side of a skirt valve according to some embodiments of the present disclosure;

fig. 15 is a structural schematic of a flow directing rib of a skirt valve according to some embodiments of the present disclosure;

FIG. 16 is a schematic structural view of a flow directing peak of a skirt valve according to some embodiments of the present disclosure;

fig. 17 is a cross-sectional structural schematic of a skirt valve according to some embodiments of the present disclosure.

In the figure:

11. the device comprises a hopper 12, a conveying cylinder barrel 13, a water tank 14 and a pumping oil cylinder;

2. the skirt valve 21, the feed inlet 22, the discharge outlet 23, the circular tube structure 24, the skirt tube structure 241, the recessed area 251, the first mounting ring 252, the second mounting ring 26, the clamping device 271, the first flow guide peak 272, the second flow guide peak 28 and the flow guide rib plate;

3. a swing shaft 31, a driving system;

4. the valve C, 41, the valve C feed inlet, 42, the valve C discharge outlet, 43, the valve C swing shaft;

5. s valve, 51, S valve inlet, 52, S valve outlet, 53, S valve swing shaft.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

As shown in FIGS. 1-16:

in one aspect of the present disclosure, there is provided a dispensing valve swingably mounted inside a hopper 11, capable of transporting fluid material, comprising:

the skirt valve comprises a feeding hole 21, a discharging hole 22 and a pumping cavity which is formed inside the skirt valve and is communicated with the feeding hole 21 and the discharging hole 22; and

the swing shaft 3 is arranged outside the skirt valve, is rotatably connected to the hopper 11, can drive the skirt valve to swing relative to the hopper 11 under the driving of the driving system 31, and on a plane vertical to the swing shaft 3, the projection of the swing shaft 3 is not overlapped with the projection of the feed port 21 and the discharge port 22;

wherein, the product of the area of the feed inlet 21 and the distance from the centroid of the feed inlet 21 to the swing shaft 3 is equal to the product of the area of the discharge outlet 22 and the distance from the centroid of the discharge outlet 22 to the swing shaft 3.

As shown in FIG. 1, the dispensing valve is swingably mounted inside the hopper 11 and is powered by a drive system 31 external to the hopper 11. The inlet 21 of the distribution valve is periodically connected to the two conveying cylinders 12, respectively, and in each cycle the oscillating position of the distribution valve is such that one of the two conveying cylinders 12 pumps fluid material through the outlet 22 of the distribution valve to the conveying line outside the hopper 11, while the other of the two conveying cylinders 12 not connected to the inlet 21 of the distribution valve sucks fluid material from the hopper 11 in preparation for the pumping-out process in the next cycle. During operation of the two transfer cylinders 12, the power for the volume change inside the transfer cylinders 12 is supplied by the pumping cylinders 14 and the water required for the pumping of the transfer cylinders 12 is supplied by the water tank 13.

As shown in FIGS. 2 to 7, the structure of the dispensing valve using the skirt valve, the S valve and the C valve is schematically shown. The prior art mostly adopts an S valve shown in figures 4 to 5 and a C valve shown in figures 6 to 7.

Specifically, the design center line of the S-valve is formed by tangency of a parabola and a straight line, and the S-valve is generally of a reducing structure, and has a large inlet area and a small outlet area. Based on this structure, the swing shaft 53 of the S valve is coaxial with the discharge port 52, the feed port 51 is offset from the swing shaft 53 and connected to the conveying cylinder, and the discharge port 52 and the conveying line are always kept in communication. In the swing process of the S valve, the feeding port 51 is switched between the two conveying cylinder barrels 12 in a reciprocating mode, and the discharging port 52 is connected to a conveying pipeline, so that fluid materials are sucked and discharged.

However, the feed port 51 of the S-valve is offset from the oscillating shaft 53, so that the feed port 51 generates a large torque in the pumping process, the oscillation of the S-valve in the hopper 11 is not stable enough, the S-valve generates an offset load in the pumping process, the abrasion of a shaft end structure of a wearing part, a glasses plate and a cutting ring is accelerated, and the service life of the distribution valve is reduced; the curvature change of the discharge port 52 of the S valve and the swing shaft 53 is large, so that the flow resistance of the fluid material in the S valve is increased, the fluid material is easy to accumulate at the position with large curvature change, and the accumulated material is difficult to clean due to the small diameter of the outlet of the S valve, so that the pipe is easy to block after long-term use; further, due to structural limitations of the S-valve and the hopper 11, the S-valve must be attached and detached at a specific angle, which makes replacement inconvenient.

Wherein the C-valve is a three-dimensional tubular dispensing valve, which is typically mounted on the front plate of the hopper 11 and is vertically disposed. The working principle of the valve C is similar to that of the valve S5, the discharge port 42 is communicated with the conveying pipe as a swing center, and the feed port 41 is periodically switched with the two conveying cylinder barrels 12 in the swing process, so that the fluid material is sucked and discharged.

However, the C valve is arranged vertically and separately, so that the universality is poor, the arm support can only be installed at the front part of the pump truck generally, and the C valve is difficult to be applied to a vehicle-mounted pump or a towing pump; the valve C is provided with two right-angle transition arcs which are limited to structural space reasons, and the right-angle transition arcs are usually small, so that pumping resistance is large; the feeding hole 41 of the valve C is offset from the oscillating shaft 3, so that the feeding hole 41 bears large torque in the pumping process, offset load is easy to occur, the influence on the sealing performance is large, and the valve C is difficult to realize high-pressure pumping; in addition, the feeding hole 41 and the swinging shaft 3 are offset, so that the stress of the C valve is unstable, the service life of a wearing part is short, and the phenomenon of pipe blockage can be caused if the C valve is not replaced in time.

To this, this application adopts the skirt valve structure, utilizes skirt valve feed inlet 21 little, discharge gate 22 big, the runner camber change is little, the smooth structural feature of the interior radian transition of runner, reduces the flow resistance of fluid material in the pumping process. And the characteristic that the swing area of the skirt valve is larger is utilized, so that the fluid material is stirred in the hopper 11 more violently, the fluidity of the fluid material is enhanced, the suction efficiency of the fluid material is improved, and the pumping efficiency is improved on the whole.

And for the stress condition of the skirt valve in the hopper 11, the skirt valve structure of the application is configured as follows: on a plane perpendicular to the swing shaft 3, the projection of the swing shaft 3 is not overlapped with the projection of the feed port 21 and the discharge port 22, and the product of the area of the feed port 21 and the distance from the centroid of the feed port 21 to the swing shaft 3 is equal to the product of the area of the discharge port 22 and the distance from the centroid of the discharge port 22 to the swing shaft 3.

Also the skirt valve feed inlet 21 and the discharge gate 22 of this application all bias in swing axis 3, are different from the unilateral atress condition of S valve or C valve feed inlet and discharge gate, make the feed inlet 21 and the discharge gate 22 of skirt valve atress simultaneously through coaxial design, and then improve the stability of valve body in hopper 11. Furthermore, by configuring the quantity relationship of two parameters of the area of each of the inlet 21 and the outlet 22 of the skirt valve and the distance between each of the inlet 21 and the outlet 22 and the swing shaft 3, the design of equal torque between the inlet 21 and the outlet 22 is realized, so that the inlet 21 and the outlet 22 are stressed simultaneously and the acting forces at the two ends are offset during the swinging process and the pumping process of the valve body relative to the hopper 11, and the stability of the skirt valve in the hopper 11 is enhanced.

The area of the inlet 21 or the outlet 22 refers to the flow area of the fluid material flowing through the inlet 21 or the outlet 22, the centroid of the inlet 21 or the outlet 22 refers to the center of the irregular plane figure, and the distance from the centroid to the swing shaft 3 can be regarded as the arm length in the torque calculation.

Specifically, the method comprises the following steps: the area of the feed port 21 of the skirt valve is A1, the moment arm of the feed port 21 of the skirt valve is L1, the pressure of the feed port 21 of the skirt valve is P1, and the torque of the feed port 21 of the skirt valve is M1-P1 × A1 × L1; the area of the skirt valve discharge port 22 is A2, the moment arm of the skirt valve discharge port 22 is L2, the pressure of the skirt valve discharge port 22 is P2, and the torque of the skirt valve discharge port 22 is M2 ═ P2 × A2 × L2. Since the pressure loss between the skirt valve inlet 21 and the skirt valve outlet 22 is small, the equal torque principle can be expressed as follows, assuming that the skirt valve inlet 21 pressure P1 and the outlet 22 pressure P2 are equal, i.e., P1 is equal to P2: a1 × L1 ═ a2 × L2.

The skirt valve is more stable in the hopper 11, so that the service life of easily-worn parts such as a glasses plate, a cutting ring, an alloy kidney-shaped ring, a butterfly-shaped plate, a valve body and the like is longer, the design difficulty of the swing shaft 3 is reduced, the sealing structure between the skirt valve and the hopper 11 is more reliable, and the maintenance cost is lower.

Further, in order to optimize the force conditions of the skirt valve, in some embodiments the cross-sectional area of the pumping chamber in a section perpendicular to the oscillation axis 3 varies uniformly between the inlet port 21 and the outlet port 22.

The sectional area of the pumping cavity of the skirt valve on the section vertical to the swing shaft 3 is uniformly changed, the sudden change of the sectional area of the flow passage in the skirt valve is avoided, the blocking risk of fluid materials is reduced, and the stress condition of the skirt valve is further optimized.

Further, in order to provide the skirt valve with equal torque characteristics as a whole to optimize the force state of the skirt valve, in some embodiments, on the cross section of any two pumping chambers perpendicular to the swing axis 3 and between the inlet port 21 and the outlet port 22, the cross section area is equal to the product of the distance from the centroid of the cross section to the swing axis 3.

Further, in some embodiments, the area of the inlet 21 is smaller than the area of the outlet 22. So that the interior of the skirt valve is easy to be hardened, heat treated and welded with the wear-resistant layer. And if the hardened layer is worn, the larger area of the discharge port 22 can be conveniently subjected to secondary hardening, so that the theoretical life of the skirt valve reaches infinity. In addition, the skirt valve has a small inlet and a large outlet, and the outlet end of the hopper 11 has an open structure, so that the change of the dispensing valve is more convenient.

Further, in order to form the skirt-like structure of the skirt valve, in some embodiments, the skirt valve has a circular tube structure 23 in a partial region close to the inlet 21 and a skirt tube structure 24 including a recessed region 241 in a partial region close to the outlet 22. The skirt tube structure 24 has an elliptical cross-sectional shape perpendicular to the swing axis 3, and the recessed region 241 is formed by smoothly recessing the boundary of the elliptical shape along the centroid of one of the elliptical short axes. The section of the circular tube structure 23 perpendicular to the oscillating shaft 3 is circular, and the projection of the circle center of the circle on the ellipse passes through the straight line where the minor axis of the ellipse is located; the position of the swing shaft 3 is configured to: the projection of the pivot axis 3 on the ellipse passes through the line on which the minor axis of the ellipse lies and is located on the side of the skirt-like tube structure 24 close to the recessed region 241.

Further, in order to fixedly arrange the oscillating shaft 3, in some embodiments, the skirt valve is provided with a first mounting ring 251 and a second mounting ring 252, and the distribution valve further comprises:

and the clamping device 26 is arranged between the first mounting ring 251 and the second mounting ring 252 and is positioned between the swing shaft 3 and the outer surface of the skirt valve, and the projection of the clamping device 26 on a plane vertical to the swing shaft 3 is of a double-hump structure and is used for clamping the swing shaft 3.

The double-humped structure of the clamping device 26 has two inclined surfaces with different oblique angles, so that the principle of friction angle is utilized, the swinging shaft 3 forms self-locking at the two inclined surfaces at two swinging limit positions, and the position of the swinging shaft 3 is limited.

Further, in order to provide a constant unilateral flow of the fluid material in the skirt valve, in some embodiments, the dispensing valve further comprises:

the first flow guiding peak 271 is fixedly arranged on the inner wall surface of one side, close to the concave area 241, of the skirt valve and protrudes towards the interior of the pumping cavity; and

the second flow guiding peak 272 is fixedly arranged on the inner wall surface of one side of the skirt valve, which is far away from the recessed area 241, and protrudes towards the inside of the pumping cavity;

the first flow guiding peak 271 and the second flow guiding peak 272 are not intersected with each other and have opposite protruding directions, so that the pumping cavity is divided into a first flow channel and a second flow channel which are positioned on two sides of a connecting line of the protruding directions of the first flow guiding peak 271 and the second flow guiding peak 272 and are communicated with each other.

The first flow guiding peak 271 and the second flow guiding peak 272 are arranged, so that when the skirt valve pumps fluid materials, only half of the internal flow channel is filled with the fluid materials, single-side abrasion of the skirt valve is achieved, the contact area of the fluid materials and the valve body is reduced to half of that of other valve bodies with the same specification, surface abrasion of the valve body is greatly reduced, and the theoretical use amount of the skirt valve reaches twice that of a common valve body.

Further, to match the shape of the first and second flow peaks 271, 272 to the configuration of the skirt valve, in some embodiments, the slope of the first flow peak 271 relative to the pumping chamber wall is greater than the slope of the second flow peak 272 relative to the pumping chamber wall. That is, the first flow guiding peak 271 is made steeper than the second flow guiding peak 272.

Further, in some embodiments, the hopper 11 comprises a first pumping port and a second pumping port connected to the skirt valve feed port 21, and the distribution valve further comprises:

at least two flow guide rib plates 28 fixedly arranged on the outer wall surface of the skirt valve far away from the recessed area 241, and the length direction of the flow guide rib plates is arranged between the inflow opening and the outflow opening;

wherein one of the at least two air guide ribs 28 is configured to: when the feed port 21 is communicated with the first pumping port or the second pumping port, one of the at least two guide ribs 28 swings with the skirt valve to a position closing the gap between the skirt valve and the hopper 11 and opens the second pumping port or the first pumping port.

The guide ribs 28 reduce the oscillating friction of the valve body and thus reduce wear on the outer surface of the valve body. Meanwhile, the guide rib plates 28 are fitted at the connecting positions of the hopper 11 and the conveying cylinder, so that the fluid material can be promoted to flow from the hopper 11 to the pumping cylinder barrel, and the suction efficiency of the material is improved.

Further, to reduce the weight of the skirt valve, in some embodiments, the wall thickness of the skirt tube structure 24 increases toward the spout 22. The design of unequal thickness is adopted, and the skirt valve is thicker at a place with large abrasion loss and thinner at a place with small abrasion loss, so that the light-weight design of the valve body is realized on the basis of ensuring the balance of the service life of the valve body.

Further, in order to optimize the wear performance of the valve body, in some embodiments, the distribution valve further comprises:

and the wear-resistant layer is fixedly formed on at least part of the inner wall of the skirt valve, and the material strength of the wear-resistant layer is higher than that of the skirt valve. Wherein, the projection of the distribution range of the wear-resistant layer on the inner wall of the skirt-shaped pipe on the plane vertical to the swinging shaft 3 is not superposed with the projection of the inflow port on the plane vertical to the swinging shaft 3.

Further, in an aspect of the present disclosure, there is provided a pumping machine comprising a dispensing valve as in any of the previous embodiments.

Therefore, according to the embodiment of the disclosure, the advantages of small curvature change and gentle radian of the skirt valve flow channel are utilized, and the flow resistance of the fluid material in the pumping process is reduced; the feeding hole 21 and the discharging hole 22 of the skirt valve are offset on the swing shaft 3, the torque between the feeding hole 21 and the discharging hole 22 is the same, the feeding hole 21 and the discharging hole 22 of the skirt valve are stressed simultaneously to optimize the stress state of the skirt valve, and the skirt valve is more stable in the hopper 11, so that the service life of parts matched with the skirt valve is prolonged, and the maintenance cost of the distribution valve is reduced; utilize the structural feature of skirt valve, reduce the area of contact of fluid material and skirt valve, reduce the wearing and tearing of skirt valve internal surface, set up the skirt valve into that feed inlet 21 is little and discharge gate 22 is big, be convenient for maintain and process skirt valve inside, increase the life-span of skirt valve.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A dispensing valve swingably mounted inside a hopper (11) capable of transporting fluid material, characterized by comprising:

the skirt valve (2) comprises a feeding hole (21), a discharging hole (22) and a pumping cavity which is formed inside the skirt valve (2) and communicated with the feeding hole (21) and the discharging hole (22); and

the swing shaft (3) is arranged outside the skirt valve (2), is rotatably connected to the hopper (11), can drive the skirt valve (2) to swing relative to the hopper (11) under the drive of a drive system (31), and on a plane perpendicular to the swing shaft (3), the projection of the swing shaft (3) is not overlapped with the projection of the feed port (21) and the discharge port (22);

wherein, the product of the area of the feed inlet (21) and the distance from the centroid of the feed inlet (21) to the swing shaft (3) is equal to the product of the area of the discharge outlet (22) and the distance from the centroid of the discharge outlet (22) to the swing shaft (3).

2. Dispensing valve according to claim 1, characterized in that the cross-sectional area of the pumping chamber in a section perpendicular to the axis of oscillation (3) varies uniformly between the inlet orifice (21) and the outlet orifice (22).

3. Dispensing valve according to claim 2, characterized in that on any two cross sections of the pumping chamber perpendicular to the axis of oscillation (3) and between the inlet orifice (21) and the outlet orifice (22), the cross section has a cross section equal to the product of the distance of the centroid of the cross section from the axis of oscillation (3).

4. A dispensing valve according to claim 2, characterized in that the area of the inlet opening (21) is smaller than the area of the outlet opening (22).

5. Dispensing valve according to claim 1, characterized in that the skirt valve (2) exhibits a round tube structure (23) in a partial region close to the inlet opening (21) and a skirt tube structure (24) comprising a recessed region (241) in a partial region close to the outlet opening (22).

6. Dispensing valve according to claim 5, characterized in that the skirt structure (24) has an oval shape in cross-section perpendicular to the axis of oscillation (3), the recessed area (241) being constituted by a smooth recess of the oval's boundary along one of its minor axes towards the oval's centroid.

7. Dispensing valve according to claim 6, characterized in that the circular tube structure (23) has a circular cross-sectional shape perpendicular to the axis of oscillation (3), the projection of the center of the circle on the ellipse passing through the line on which the minor axis of the ellipse lies;

the position of the oscillating shaft (3) is configured to: the projection of the swing shaft (3) on the ellipse passes through a straight line where the minor axis of the ellipse is located, and is located on one side, close to the recessed area (241), of the skirt-shaped tube structure (24).

8. Dispensing valve according to claim 7, characterized in that a first mounting ring (251) and a second mounting ring (252) are provided on the skirt valve (2) for the fixed arrangement of the oscillation shaft (3), the dispensing valve further comprising:

and the clamping device (26) is arranged between the first mounting ring (251) and the second mounting ring (252) and is positioned between the swinging shaft (3) and the outer surface of the skirt valve (2), and the projection of the clamping device (26) on a plane vertical to the swinging shaft (3) is of a double-hump structure and is used for clamping the swinging shaft (3).

9. The dispensing valve in accordance with claim 5 further comprising:

the first flow guiding peak (271) is fixedly arranged on the inner wall surface of the skirt valve (2) close to one side of the concave area (241) and protrudes towards the interior of the pumping cavity; and

the second flow guiding peak (272) is fixedly arranged on the inner wall surface of one side, away from the concave area (241), of the skirt valve (2) and protrudes towards the interior of the pumping cavity;

the first flow guiding peak (271) and the second flow guiding peak (272) are not intersected with each other and have opposite protruding directions, so that the pumping cavity is divided into a first flow channel and a second flow channel which are positioned on two sides of a connecting line of the protruding directions of the first flow guiding peak (271) and the second flow guiding peak (272) and are communicated with each other.

10. The distributor valve according to claim 9, wherein the slope of the first flow guide peak (271) with respect to the pumping chamber wall is greater than the slope of the second flow guide peak (272) with respect to the pumping chamber wall.

11. A dispensing valve according to claim 5, characterized in that the hopper (11) comprises a first and a second pumping port connected to the feed opening (21) of the skirt valve (2), the dispensing valve further comprising:

at least two flow guide rib plates (28) are fixedly arranged on the outer wall surface of one side, away from the recessed area (241), of the skirt valve (2), and the length direction of the flow guide rib plates is arranged between the inflow opening and the outflow opening;

wherein one of the at least two flow guide ribs (28) is configured to: when the feed port (21) is communicated with the first pumping port or the second pumping port, one of the at least two flow guide ribs (28) swings along with the skirt valve (2) to a position closing a gap between the skirt valve (2) and the hopper (11), and opens the second pumping port or the first pumping port.

12. Dispensing valve according to claim 5, characterized in that the skirt structure (24) has a wall thickness which increases towards the outlet opening (22).

13. The dispensing valve in accordance with claim 5 further comprising:

and the wear-resistant layer is fixedly formed on at least part of the inner wall of the skirt valve (2) and has higher material strength than that of the skirt valve (2).

14. Dispensing valve according to claim 13, characterized in that the projection of the distribution range of the wear-resistant layer on the inner wall of the skirt on a plane perpendicular to the axis of oscillation (3) does not coincide with the projection of the inlet on a plane perpendicular to the axis of oscillation (3).

15. A pumping machine comprising a dispensing valve as claimed in any one of claims 1 to 14.