JP4335543B2 - Reciprocating double-row volumetric pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reciprocating double-row positive displacement pump for conveying high viscosity materials, such as slurry or sludge.
[0002]
[Prior art]
In general, reciprocating double-row volumetric pumps are widely used when transporting high viscosity materials, such as soot sludge or sludge treated in a sludge treatment plant. FIG. 5 (a) is a top view of a conventional reciprocating double-row volumetric pump as disclosed in, for example, Japanese Patent Laid-Open No. 5-302568, and FIG. 5 (b) is a line in FIG. 5 (a). It is a fragmentary longitudinal cross-sectional view of the reciprocating double row type positive displacement pump of a prior art seen along AA.
[0003]
As shown in FIG. 5 (a), the reciprocating double-row volumetric pump 100 of the prior art includes a pair of pumping cylinders 111, 111 ′ having the same volume and arranged in parallel with each other. As shown in FIG. 4, these pressure feeding cylinders 111 and 111 ′ contain pressure feeding pistons 115 and 115 ′, respectively. Since the pressure feeding pistons 115 and 115 ′ are connected to pistons (not shown) in the drive cylinders 118 and 118 ′, they can reciprocate in the pressure feeding cylinders 111 and 111 ′.
[0004]
As shown in FIG. 5B, a suction valve chamber 129 is formed on the cylinder head side of the pressure feeding cylinder 111. Further, a suction port 112 is formed above the suction valve chamber 129. A hopper (not shown) is usually positioned above the suction port 112, and a transported material, for example, slurry or sludge charged into the hopper is put into the reciprocating double row volumetric pump 100. As shown in FIG. 5B, a suction valve cylinder 120 is connected to the suction valve chamber 129. A piston (not shown) in the suction valve cylinder 120 drives a valve shaft 121 provided with a valve body 122. Thereby, the suction inlet 112 can be opened and closed.
[0005]
Similarly, a discharge valve chamber 149 is formed further from the pressure feed piston 115 than the suction valve chamber 129. As shown in FIG. 5B, a discharge valve cylinder 140 is connected to the discharge valve chamber 149. A piston (not shown) in the discharge valve cylinder 140 drives a valve shaft 141 provided with a valve body 142. Thereby, the discharge port 148 of the reciprocating double-row volumetric pump 100 can be opened and closed.
[0006]
The pressure feed cylinder 111 ′ side of the reciprocating double row volumetric pump 100 has the same configuration as the pressure feed cylinder 111 side. Accordingly, the conventional reciprocating double-row volumetric pump shown in FIGS. 5 (a) and 5 (b) is provided with one pressure-feeding cylinder by pulling in the pressure-feeding piston 115 while opening the suction port 112 with the suction valve body 122. 111, the conveyed product is sucked into 111, and at the same time the discharge port 149 is closed by the discharge valve body 142, and the pressurized piston 115 'is pushed in, thereby discharging the conveyed product in the other pressurized cylinder 111'. By alternately repeating this suction pushing operation in the pair of pressure feeding cylinders 111 and 111 ′, the conveyed product can be continuously conveyed.
[0007]
[Problems to be solved by the invention]
However, the conventional reciprocating double-row positive displacement pump disclosed in Japanese Patent Application Laid-Open No. 5-302568 has a pair of suction valve cylinders 120, 120 ′ and pistons (not shown) and a pair of valves included therein. Since the shafts 121 and 121 'and the suction valve bodies 122 and 122' are included, a relatively large number of parts are included, and as a result, the price of the entire reciprocating double-row type positive displacement pump is improved.
[0008]
Further, since there are a relatively large number of driveable parts such as the valve shafts 121 and 121 ′ and the suction valve bodies 122 and 122 ′, the operation cost increases and the possibility of breakage increases. Furthermore, the repair / inspection time of the reciprocating double-row volumetric pump 100 is increased by having a relatively large number of drive parts.
[0009]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a reciprocating double-row volumetric pump that can be operated at low cost by reducing the number of components that can be driven.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, according to the first aspect of the present invention, a pair of pressure feed cylinders that are arranged in parallel with each other and that respectively include reciprocating pistons, and the cylinder head side of the pressure feed cylinders To alternately open and close one suction valve shaft that can reciprocate vertically with respect to the reciprocating direction of the piston, a pair of transported object suction ports facing each other on the suction valve shaft, and the transported object suction port A pair of suction valve bodies attached to the suction valve shaft, and a pair of transport object discharge ports for discharging the transport object, the distance between the pair of suction valve bodies is It is larger than the distance between the conveyed product suction ports facing each other, and one suction valve element of the suction valve shaft opens one of the conveyed product suction ports, and the other suction valve element is the other. If you close the transport inlet In addition, a reciprocating double-row volumetric pump is provided in which the transported material is sucked into the one transport cylinder from the one transported material suction port and the transported material in the other transport cylinder is discharged from the transported material discharge port. Is done.
[0011]
That is, according to the first aspect of the present invention, since two valve bodies are installed on one valve shaft, the number of parts that can be driven can be reduced. The time required for this can also be reduced. When one suction valve element is closed, the other suction valve element does not need to completely open the other suction opening, as long as the other suction opening is at least partially open. It ’s enough.
[0012]
According to the second aspect of the present invention, it further includes discharge valve bodies respectively attached to the pair of discharge valve shafts in order to open and close the pair of conveyed product discharge ports.
That is, according to the second aspect of the present invention, the conveyed product can be reliably sucked and discharged without causing the conveyed product to flow backward. As a matter of course, the discharge valve body corresponds to the movement of the piston in the pressure feeding cylinder. That is, the discharge valve body closes the discharge port when the piston of the corresponding pressure feed cylinder is retracted, and opens when the piston of the pressure feed cylinder is pushed out.
[0013]
According to the invention of claim 3, when the one suction valve body is closed, the distance between the other suction valve body and the corresponding suction port is about ½ of the inner diameter of the suction port. It is as follows.
That is, according to the third aspect of the present invention, the operating efficiency can be maintained optimally. For example, the inner diameter of the suction port is preferably about 200 mm, and the distance between the suction valve body and the corresponding suction port is preferably about 100 mm.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following drawings, the same members are denoted by the same reference numerals. In order to facilitate understanding, the scales of these drawings are appropriately changed.
FIG. 1 is a top view of a reciprocating double-row positive displacement pump according to the present invention. As shown in FIG. 1, the reciprocating double-row volumetric pump 10 includes a pair of pumping cylinders 11 and 11 ′ having the same volume and arranged in parallel to each other. As will be described later, these pressure feed cylinders 11 and 11 'include pressure feed pistons 15 and 15' that can reciprocate. Further, the pressure feeding cylinders 11 and 11 ′ are connected to driving cylinders 18 and 18 ′ driven by pressure oil through the water chamber 14 on the piston rod side of the pressure feeding cylinders 11 and 11 ′. Suction valve chambers 29 and 29 'are formed on the cylinder head side of the pressure feed cylinders 11 and 11', respectively. As shown in FIG. 1, a supply chamber 36 having a supply port 12 is formed between the suction valve chambers 29 and 29 ′. A hopper 91 (shown by a dotted line) is installed above the reciprocating double-row volumetric pump 10. In the hopper 91, a high-viscosity substance that is a conveyed product, for example, a sludge that has been trapped or sludge that is processed in a sludge treatment plant is charged. The hole formed in the bottom of the hopper communicates with the supply port 12 formed above the supply chamber 36, and the conveyed product in the hopper is supplied into the supply chamber 36 through the supply port 12.
[0015]
Further, a discharge valve chamber 49 is formed farther from the suction valve chamber 29 when viewed from the pressure pistons 15 and 15 ′ in the pressure cylinders 11 and 11 ′. The operation cylinders 40 and 40 'are connected to the discharge valve chamber 49, and in FIG. 1, these operation cylinders 40 and 40' are located on the same straight line as the aforementioned pressure feed cylinders 11 and 11 '.
[0016]
FIG. 2 is a longitudinal sectional view of a reciprocating double-row volumetric pump according to the present invention, and FIG. 3 is a partially enlarged view of a reciprocating double-row volumetric pump according to the present invention. As shown in FIGS. 2 and 3, each pumping piston 15, 15 ′ in the pumping cylinder 11, 11 ′ is connected to a driving piston 19, 19 ′ in the driving cylinder 18, 18 ′ by a piston rod 16, 16 ′. ing. Water from a water source (not shown) is supplied to the water chamber 14 described above, and the pressure feed cylinders 11 and 11 ′ communicate with each other in the water chamber 14 on the piston rod side. The water chamber 14 and the pressure feeding cylinders 18 and 18 'are not in communication with each other.
[0017]
As shown in FIG. 3, suction ports 38, 38 'are formed in the vertical direction between the supply chamber 36 and the suction valve chambers 29, 29', for opening and closing these suction ports 38, 38 '. Suction valve bodies 24, 24 'are provided. As shown in FIG. 2, the suction valve bodies 24 and 24 'are fixed on the valve shaft 21, and the valve shaft 21 is positioned in the horizontal direction and is reciprocated with respect to the reciprocating direction of the pressure-feed pistons 15 and 15'. It is arranged vertically. One end of the valve shaft 21 is connected to a piston in the operation cylinder 20 provided in one suction valve chamber 29 ′ of the reciprocating double row volumetric pump 10. Further, the suction valve chamber 29 facing the suction valve chamber 29 ′ is provided with a valve shaft housing portion 50 that also serves as a bearing for receiving the other end of the valve shaft 21. As a matter of course, another operation cylinder may be provided instead of the valve shaft housing portion 50. The valve shaft 21 reciprocates by the piston in the operation cylinder 20. During the reciprocating motion of the valve shaft 21, the suction valve body 24 moves only in the suction valve chamber 29, and the suction valve body 24 'moves only in the suction valve chamber 29'. That is, the suction valve bodies 24 and 24 ′ do not enter the supply chamber 36.
[0018]
As shown in FIG. 3, when one suction valve body 24 closes the suction port 38 corresponding to this suction valve body 24, the other suction valve body 24 'is connected to this suction valve body 24'. The corresponding inlet 38 'is at least partially opened. That is, when one of the suction valve bodies 24 is closed, the other suction valve body 24 ′ does not need to contact the inner wall of the suction valve chamber 29 ′. In the preferred embodiment, when one of the suction valve bodies 24 is closed, the distance between the other suction valve body 24 'and the corresponding suction port 38' is about ½ of the inner diameter of the suction port. Yes. In this case, the operation efficiency can be maintained optimally. For example, the inner diameters of the suction ports 38 and 38 ′ are about 200 mm, and the distance between the other suction valve body 24 ′ and the suction port 38 ′ when the one suction valve body 24 is closed is about 100 mm.
[0019]
Further, a discharge valve chamber 49 is formed far from the suction valve chambers 29 and 29 ′ when viewed from the pressure feeding piston 15. As can be seen from FIGS. 2 and 3, discharge ports 48 and 48 ′ are formed between the discharge valve chamber 49 and the suction valve chambers 29 and 29 ′, and are used to open and close the discharge ports 48 and 48 ′. Discharge valve bodies 42 and 42 'are provided, respectively. These discharge ports become one common discharge port 90 and are appropriately connected to the secondary side pipe. As shown in FIG. 2, the discharge valve bodies 42, 42 ′ are attached to the valve shafts 41, 41 ′ and can be reciprocated by the operation cylinders 40, 40 ′. Seal portions (not shown) are provided around the discharge ports 48 and 48 ′ and the suction ports 38 and 38 ′ where the discharge valve bodies 42 and 42 ′ and the suction valve bodies 24 and 24 ′ are closed. It is preferable that this prevents the conveyed product from leaking from the suction port and the discharge port.
[0020]
The reciprocating double-row volumetric pump 10 is provided with a pair of drive cylinders 18 and 18 'for reciprocating the pressure-feeding pistons 15 and 15' in the pressure-feeding cylinders 11 and 11 ', and reciprocatingly provided therein. Drive pistons 19, 19 '. These drive cylinders 18, 18 ′ can communicate with each other by a pipe line 17 on the rod side. The rods 16 and 16 'of the drive pistons 19 and 19' are in common with the rods 16 and 16 'of the aforementioned pressure-feed pistons 15 and 15'. Check valves 51, 52 and 53, 54 are provided at both the pushing stroke end position and the pulling stroke end position of the drive cylinder 18, 18 ', respectively. Furthermore, the reciprocating double-row volumetric pump 10 also has a two-way switching valve (not shown).
[0021]
FIG. 4 is an overall view of a reciprocating double-row volumetric pump according to the present invention. As shown in FIG. 4, one of the two pipes 61, 61 ′ extending from a two-way switching valve (not shown) branches into a pipe 62 and a pipe 65 at a branch portion 79. In addition, the pipe 62 is further branched into a pipe 63 and a pipe 64 at a branching portion 78. Similarly, the pipeline 61 'branches into a pipeline 62' and a pipeline 65 'at a branch 79', and the pipeline 62 'branches into a pipeline 63' and a pipeline 64 'at a branch 78'. is doing. The pipe 64 is connected to the cylinder head side of the operating cylinder 40 ′ for opening and closing the discharge valve, and the pipe 64 ′ is connected to the piston rod side of the operating cylinder 40 ′. Similarly, the pipe line 63 ′ is connected to the cylinder head side of the operating cylinder 40, and the pipe line 63 is connected to the piston rod side of the operating cylinder 40. Further, a pipe line 64 ′ extending to the operation cylinder 20 is connected to the cylinder head side of the operation cylinder 20, and the pipe line 64 is connected to the piston rod side of the operation cylinder 20. Flow control valves 73, 71, 72 ′ are provided on the piston rod side of these operating cylinders 20, 40, 40 ′, respectively, and flow control valves 73 ′, 71 ′, 72 are provided on the cylinder head side, respectively. Yes.
[0022]
Further, the pipelines 65 and 65 ′ are connected to the cylinder head side of the drive cylinders 18 and 18 ′ via the sequence valves 74 and 74 ′, respectively. A tank, a hydraulic pressure source, and the like are connected to the above-described two-way switching valve (not shown), but the illustration is omitted for simplicity.
[0023]
Next, the operation of the reciprocating double-row volumetric pump 10 according to the present invention will be described. Pressure oil supplied from a hydraulic source (not shown) is pumped to the pipeline 61 ′. At this time, since the pipe 61 is connected to a tank (not shown), no pressure is generated. Accordingly, the pressure oil from the pipe 61 ′ is supplied to the operation cylinders 20, 40, 40 ′ through the pipe 64 ′ and the pipe 63 ′, whereby the suction valve body 24 ′ and the discharge valve body 42 are Is closed, and the suction valve body 24 and the discharge valve body 42 'are opened. In the present invention, since both the suction valve bodies 24 and 24 'are operated by the operation cylinder 20, the number of components that can be driven can be reduced. Therefore, the reciprocating double-row volumetric pump 10 of the present invention can be operated at a low cost and the time required for repair and inspection can be reduced.
[0024]
The drive pressure oil in the pipeline 61 ′ supplied from the hydraulic pressure source is supplied to the cylinder head side of the drive cylinder 18 ′ through the sequence valve 74 ′. At this time, no pressure is generated on the cylinder head side of the drive cylinder 18. Accordingly, the drive piston 19 ′ has a pushing stroke that moves to the left in FIG. Therefore, the pumping piston 15 'directly connected by the rod 16' also has a pushing stroke that moves to the left, so that the transported material, such as slurry or sludge, in the pumping cylinder 11 'passes through the discharge port 48' and the common discharge port. 90. When the drive piston 19 'moves left, the pressure oil is supplied to the rod side of the drive cylinder 18 through the pipe line 17, so that the drive piston 19 moves to the right. In other words, the drive piston 19 has a stroke that moves to the right. Accordingly, since the pressure feed piston 15 connected to the drive piston 19 by the rod 16 also moves to the right, the conveyed product to be pressure fed is sucked into the pressure feed cylinder 11 through the suction port 38. When the drive piston 19 reaches the right end of the drive cylinder 18, the impact at the time of arrival is absorbed by the action of the check valve 52. Similarly, the other check valves 51, 53, 54 serve to absorb an impact when the drive piston 19 or the drive piston 19 ′ reaches the cylinder end.
[0025]
When the drive piston 19 ′ reaches the left end, the hydraulic pressure source (not shown) is switched to be connected to the pipeline 61. Next, the pressure oil in the pipe 61 is supplied to the piston rod side of the operating cylinders 20 and 40 through the pipes 64 and 63, and is supplied to the cylinder head side of the operating cylinder 40 'through the pipe 64. Is done. As a result, the suction valve body 24 'and the discharge valve body 42 are opened, and the suction valve body 24 and the discharge valve body 42' are closed. Further, the pressure oil in the pipeline 61 is supplied to the cylinder head side of the drive cylinder 18 through the sequence valve 74. Accordingly, the drive piston 19 and the pressure feed piston 15 connected thereto move to the left in FIG. 4, whereby the conveyed product in the pressure feed cylinder 11 is discharged from the common discharge port 90 through the discharge port 48. When the pressure feed piston 15 moves to the left, the pressure oil is supplied to the rod side of the pressure feed cylinder 11 ′ via the pipe line 17, so that the piston 19 ′ moves to the right. As a result, the pumping piston 15 ′ connected to the piston 19 ′ also moves to the right, so that the conveyed product to be pumped next is sucked into the pumping cylinder 11 ′.
[0026]
The reciprocating double-row volumetric pump 10 according to the present invention draws in the pumping piston 15 while the suction port 38 is opened by the suction valve body 24 to suck the conveyed product into one pumping cylinder 11 and simultaneously discharge the discharge port 48. By pushing the pumping piston 15 ′ while being closed by the outlet valve body 42, the conveyed product in the other pumping cylinder 11 ′ is discharged. By alternately repeating this suction-extrusion operation by the pair of pumping cylinders 11 and 11 ′, the conveyed product can be continuously discharged from the common discharge port 90. In the present invention, since the two suction valve bodies 24, 24 'are operated by the single operating cylinder 20, the reciprocating double-row volumetric pump 10 can be operated at low cost.
[0027]
In the present invention, since the discharge valve bodies 42 and 42 'and the operation cylinders 40 and 40' corresponding thereto are provided, the conveyed product can be reliably sucked and discharged without the reverse flow of the conveyed product. Furthermore, as described above, for example, when the discharge valve element 42 is opened, the piston in the operation cylinder 40 moves to the cylinder head side. As a result, the pressure in the sequence valve 74 ′ increases, so that a spool (not shown) in the sequence valve 74 ′ moves, and pressure oil is supplied to the cylinder head side of the drive cylinder 18 ′. Next, the drive piston 19 ′ in the drive cylinder 18 ′ moves to the left, and the conveyed product in the pressure feed cylinder 11 ′ is discharged by the pressure feed piston 15 ′. That is, due to the presence of the sequence valve 74 ', a pressure feeding action by the pressure feeding piston 15' occurs after the opening action of the discharge valve body 42 '. Since the sequence valve 74 functions in the same manner, in the present invention, the pumping piston 15 moves to the left after the discharge valve body 42 is opened, and the pumping piston 15 moves to the right after the discharge valve body 42 is closed. To move. Therefore, in the reciprocating double-row volumetric pump 10 of the present invention, the conveyed product does not flow backward in the pump.
[0028]
Further, as shown in FIG. 3, the longitudinal dimension of the supply chamber 36 parallel to the direction of movement of the pressure feeding piston 15 is preferably larger than the dimension of the suction port 38, for example, the diameter. By securing the amount of the object, it is possible to easily suck the conveyed object into the cylinder. Therefore, it is preferable that the volume in the supply chamber 36 is larger than the suctionable amount of each of the pressure feeding cylinders 11 and 11 ′.
[0029]
Furthermore, since the number of movable parts can be reduced in the present invention, it is clear that the time required for repair and inspection of the reciprocating double-row volumetric pump 10 can be shortened. Of course, the case where two tubes extending from the bottom of the hopper are directly connected to the two suction ports 38, 38 'is also included in the scope of the present invention.
[0030]
【The invention's effect】
According to the invention described in each claim, since two valve bodies are installed on one valve shaft, the number of parts that can be driven can be reduced, so that it is possible to operate at low cost and repair and inspection. It is possible to achieve a common effect that the time required for the process can be reduced.
[0031]
Further, according to the second aspect of the invention, it is possible to achieve an effect that the conveyed product can be reliably sucked and discharged without the conveyed product flowing backward.
Furthermore, according to the third aspect of the invention, it is possible to achieve an effect that the driving efficiency can be maintained optimally.
[Brief description of the drawings]
FIG. 1 is a top view of a reciprocating double row volumetric pump according to the present invention.
FIG. 2 is a longitudinal sectional view of a reciprocating double-row positive displacement pump according to the present invention.
FIG. 3 is a partially enlarged view of a reciprocating double-row positive displacement pump according to the present invention.
FIG. 4 is an overall view of a reciprocating double-row positive displacement pump according to the present invention.
FIG. 5A is a top view of a conventional reciprocating double-row volumetric pump.
(B) It is a partial longitudinal cross-sectional view of the reciprocating double-row volumetric pump of the prior art seen along line AA of Fig.5 (a).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Reciprocating double row volumetric pump 11, 11 '... Pressure feed cylinder 12 ... Supply port 14 ... Water chamber 15, 15' ... Pressure feed piston 16, 16 '... Rod 17 ... Pipe line 18, 18' ... Drive cylinder 19, 19 '... Driving piston 20 ... Operating cylinder 21 ... Valve shaft 24, 24' ... Suction valve element 29, 29 ... Suction valve chamber 36 ... Supply chamber 38, 38 '... Suction port 40, 40' ... Operating cylinders 41, 41 '... Valve shafts 42, 42' ... Discharge valve bodies 48,48 '... Discharge port 49 ... Discharge valve chamber 50 ... Valve shaft accommodating parts 61, 61' ... Pipes 62, 62 '... Pipes 63, 63' ... Pipe lines 64, 64 '... Pipe lines 65, 65' ... Pipe lines 74, 74 '... Sequence valves 78, 78' ... Branch portions 79, 79 '... Branch portions 90 ... Common discharge port 91 ... Hopper

Claims (3)

A pair of pumping cylinders arranged parallel to each other and each containing a reciprocating piston;
One suction valve shaft capable of reciprocating perpendicularly to the reciprocating direction of the piston on the cylinder head side of the pumping cylinder;
A pair of transport object suction ports facing on the suction valve shaft;
A pair of suction valve bodies attached to the suction valve stem to alternately open and close the transport object suction port;
A pair of transport object discharge ports for discharging the transport object,
The distance between the pair of suction valve bodies is larger than the distance between the facing conveyed object suction ports, and one of the suction valve bodies of the suction valve shaft is one of the conveyed object suction ports. When the other suction valve element closes the other transported object suction port, the transported object is sucked into the one transport cylinder from the one transported object suction port and inside the other transport cylinder. A reciprocating double-row volumetric pump in which the conveyed product is discharged from the conveyed product discharge port. The reciprocating double-row volumetric pump according to claim 1, further comprising a discharge valve body attached to each of the pair of discharge valve shafts to open and close the pair of conveyed product discharge ports. The distance between the other suction valve body and the corresponding suction port when the one suction valve body is closed is about ½ or less of the inner diameter of the suction port. Reciprocating double row volumetric pump.

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