JP2008101545A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump ensuring sealing property for a long period of time by immediately discharging solid material bitten. <P>SOLUTION: This pump device is provided with a pumping action chamber 7c, an outflow/inflow port 22 opened to the pumping action chamber, a plunger 9 reciprocating in the pumping action chamber, and a cleaning space 18a for supplying a cleaning solvent to the periphery of the plunger, sucks fluid into the pumping action chamber when the plunger is slid in an x-direction, and delivers fluid in the pumping action chamber when the plunger is slid in a y-direction. A seal member 23 is arranged between the pumping action chamber and the cleaning space. When the plunger delivers fluid, the pumping action chamber is disconnected from the cleaning space by action of high pressure in the pumping action chamber. When the plunger sucks fluid, the cleaning solvent is allowed to flow from the cleaning space to the pumping action chamber by action of negative pressure in the pumping action chamber. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump device particularly effective for a fluid containing a solid substance.

As this type of pump device, one shown in Patent Document 1 is conventionally known. This conventional pump device will be described with reference to FIG.
As shown in FIG. 3, the cylinder 101 is provided with a pump working chamber 102 and an inflow / outflow port 103 that opens to the pump working chamber 102. A plunger 104 is provided in the cylinder 101 so as to be capable of reciprocating in the axial direction, and a seal 105 for sealing the outer periphery of the plunger 104 is provided to partition the cylinder 101 into the pump working chamber 102 and the cleaning space 106. is doing.
A circulation passage 107 is communicated with the cleaning space 106, and the cleaning liquid is circulated in the cleaning space 106 by the cleaning liquid supply means 108.

  According to the pump device configured as described above, when the plunger 104 is slid in the suction direction on the right side in the drawing, the inside of the pump working chamber 102 becomes negative pressure and fluid is sucked from the inflow / outflow port 103. On the other hand, when the plunger 104 is slid in the discharge direction on the left side in the drawing while the fluid is sucked into the pump working chamber 102, the pressure in the pump working chamber 102 becomes high, and the fluid in the pump working chamber 102 is discharged. It discharges from the inflow / outflow port 103. Therefore, if the plunger 104 is reciprocated, the fluid can be sucked or discharged from the inflow / outflow port 103.

Further, the plunger 104 reciprocates between the pump working chamber 102 and the cleaning space 106 when sucking and discharging fluid. As described above, since the cleaning liquid circulates in the cleaning space 106, when the plunger 104 enters the cleaning space 106, the outer periphery of the plunger 104 is cleaned by the circulating cleaning liquid.
Therefore, for example, when the pump device discharges the slurry, the solid substance adheres to the outer periphery of the plunger 104 in the pump working chamber 102. Even if the solid substance adheres, the plunger 104 is in the process of reciprocating. The solid substance on the outer periphery can be removed.
If the outer periphery of the plunger 104 is always washed during the reciprocating motion in this way, the solid material does not stick to the plunger 104 and cannot be removed.
JP 2001-241385 A

According to the above-described conventional pump device, the outer periphery of the plunger 104 can be cleaned in the cleaning space 106, but even the solid substance once caught in the sliding contact portion of the seal 105 cannot be removed.
That is, when the plunger 104 moves from the pump action chamber 102 side in the suction direction on the right side in the drawing, the solid substance in the slurry inevitably bites into the seal 105 as the plunger 104 moves.
On the other hand, when the plunger 104 is moved in the discharge direction on the left side in the figure, since the inside of the pump working chamber 102 is at a high pressure, the solid substance caught in the sliding contact portion of the seal 105 is 104 is not easily discharged to the pump working chamber 102 side.

  As described above, once the solid substance is caught in the sliding contact portion of the seal 105, the solid substance is not easily discharged, and the plunger 104 or the seal 105 is damaged and the sealing performance is deteriorated. There has been a problem that the wear deterioration of the toner becomes faster.

  An object of the present invention is to provide a pump device that can ensure sealing performance over a long period of time even when a solid substance is caught in a seal, by immediately discharging the solid substance.

  According to a first aspect of the present invention, there is provided a pump action chamber formed in a cylinder, an inflow / outlet port opened to the pump action chamber, a plunger reciprocating in the pump action chamber, and the plunger provided adjacent to the pump action chamber. A cleaning space for supplying cleaning liquid to the outer periphery, and when the plunger slides in the suction direction, fluid is sucked into the pump working chamber from the inlet / outlet port, while the plunger slides in the discharge direction, In the pump device that discharges the fluid in the pump working chamber from the inflow / outflow port, a seal member that seals the outer periphery of the plunger is provided between the pump working chamber and the cleaning space, and the seal member is configured so that the plunger allows the fluid to flow. When discharging, the high pressure of the pump working chamber acts to shut off the pump working chamber and the cleaning space, while the plunger absorbs fluid. To time, characterized in that the negative pressure in the pumping chamber to permit the flow of cleaning liquid into the pumping chamber from the cleaning space acts.

The second invention is characterized in that an auxiliary seal member is provided on the outer periphery of the plunger, and a cleaning space is positioned between the auxiliary seal member and the seal member.
In the third aspect of the invention, a variable throttle for adjusting the communication opening degree is interposed between the cleaning space and the cleaning liquid tank, and the flow rate of the cleaning liquid flowing from the cleaning space to the pump working chamber can be adjusted by controlling the variable throttle. It has the feature in the point.

According to the first invention, the seal member shuts off the pump action chamber and the cleaning space when the plunger discharges the fluid, and communicates the pump action chamber and the cleaning space when the plunger sucks the fluid. Therefore, when the fluid is discharged, the pump working chamber can be kept at a high pressure so that the fluid can be reliably discharged from the inflow / outflow port. When the fluid is sucked, the cleaning liquid flows from the cleaning space to the pump working chamber, and the seal member slides. The contact portion can be cleaned.
As described above, since the cleaning liquid is circulated from the cleaning space to the pump working chamber at the time of inhaling the fluid, even if the solid substance is caught in the seal member, the solid substance can be surely discharged and the sealing performance is ensured. be able to.
Further, it is possible to reduce the wear deterioration of the seal due to the biting of the solid substance, and to ensure the sealing performance for a long time.
Moreover, since the plunger can be cooled by the cleaning liquid supplied to the cleaning space, there is no possibility that the plunger becomes hot and the seal is deformed.

According to the second invention, since the cleaning space is positioned between the seal member and the auxiliary seal member, the cleaning liquid can be reliably guided to the pump working chamber side when the fluid is sucked.
Further, since the auxiliary sealing member is provided, the cleaning liquid does not leak from a place other than the sealing member even if the supply pressure of the cleaning liquid is increased. Therefore, if the supply pressure of the cleaning liquid is increased in order to remove the solid substance caught in the seal member, the solid substance can be reliably guided to the pump working chamber.

According to the third invention, since the variable throttle is provided between the cleaning space and the cleaning liquid tank, the flow rate of the cleaning liquid guided to the pump working chamber side can be adjusted. Therefore, when the fluid sucked and discharged from the inlet / outlet port contains almost no solid substance, that is, when it is not necessary to clean the seal member, the opening of the variable throttle is increased and the pump working chamber side is increased. The flow rate of the cleaning liquid leading to
If the fluid sucked and discharged from the inflow / outflow port contains a large amount of solid substance, the opening of the variable throttle is decreased to increase the flow rate of the cleaning liquid discharged to the pump working chamber side. Can be reliably prevented from biting into the seal member.

An embodiment of the present invention will be described with reference to FIGS.
The pump device according to the present invention can be widely used in all mechanical devices, and particularly exhibits its function in a mechanical device in which a slurry containing a solid substance flows. Therefore, in this embodiment, a case where the pump of the present invention is used in a wet oxidation apparatus in which slurry flows will be described.

FIG. 1 is a simplified circuit diagram of a wet oxidation apparatus. First, the wet oxidation apparatus will be described with reference to FIG. The storage tank 1 is a tank for storing a slurry obtained by mixing organic substances such as shochu and water, and the feed tank 2 supplies the slurry stored in the storage tank 1 to the raw material tank 3. The raw material tank 3 is provided with stirring means 4 driven by a motor M so as to stir so that solid substances do not precipitate.
The slurry stirred in the raw material tank 3 is supplied to the reaction mechanism A through the passages 5 and 6, and the pump device PP supplies the slurry from the raw material tank 3 to the reaction mechanism A.

This pump device PP is a double-acting cylinder type pump, a pair of pressure chambers 7a and 7b formed in the cylinder 7, and a pair of pumps formed adjacent to each other outside the pressure chambers 7a and 7b and formed in the cylinder 7. The working chambers 7c and 7d are provided. The pair of pressure chambers 7a and 7b are defined by a piston 8 slidably provided in the cylinder.
The piston 8 is provided with plungers 9 at both ends thereof, and the plunger 9 is protruded from the pressure chambers 7a and 7b so that the front ends thereof face the pair of pump action chambers 7c and 7d.

A hydraulic pump P is connected to the pressure chambers 7a and 7b via a control valve 10, and hydraulic oil discharged from the hydraulic pump P is guided to one of the pressure chambers 7a and 7b. The return oil from the other chamber is guided to the tank T.
Therefore, when the control valve 10 is switched, the piston 8 slides with the hydraulic oil guided from the hydraulic pump P to the pressure chambers 7 a and 7 b, and the plunger 9 slides integrally with the piston 8. The control valve 10 is continuously switched by a controller (not shown) so that hydraulic oil is alternately guided to the pressure chambers 7a and 7b to continuously reciprocate the piston 8 and the plunger 9. I have to.

When the plunger 9 reciprocates in the pair of pump action chambers 7c and 7d, the suction process and the discharge process are repeatedly performed in the pump action chambers 7c and 7d. That is, the plunger 9 when moving downward in the figure, the slurry is sucked into the pumping chamber 7c from the raw material tank 3 via a check valve C _1. On the other hand, the plunger 9 when moving upward in the drawing, the slurry drawn into the pumping chamber 7c, along with discharged into the passage 5 again, is led to the reaction mechanism A to be described later pushes open the check valve C _2. In addition, the suction and discharge of the slurry is performed in the pump working chamber 7c, and at the same time, the same suction and discharge in the pump working chamber 7d are performed in the pump working chamber 7d through the passage 6 and the check valves C ₃ and C _4. Done continuously. However, due to the configuration of the pump device PP, when the pump working chamber 7c is in the suction process, the pump working chamber 7d is in the discharging process, and when the pump working chamber 7c is in the discharging process, the pump working chamber 7d is in the suction process. . Therefore, in the pump device PP as a whole, both the suction process and the discharge process are continuously performed.
The specific configuration of the pump device PP will be described later.

The slurry discharged from the pump device PP is guided to the reaction mechanism A, and the organic substances in the slurry are oxidized in the reaction mechanism A. In the reaction mechanism A, the first reaction column 11 to the third reaction column 13 are connected in series, and the slurry discharged from the pump device PP sequentially passes through the reaction columns 11 to 13. In addition, an air supply means 14 is connected to each of the reaction towers 11 to 13, and an oxygen-containing gas composed of air or oxygen adjusted to a predetermined temperature is supplied together with the slurry. And while this air etc. contact the organic substance in a slurry in each reaction tower 11-13, the said organic substance is made to chemically react and it oxidizes.
The slurry oxidized in the reaction mechanism A as described above is guided as a processing fluid from the third reaction tower 13 to the gas-liquid separator 16 through the discharge means 15, and in this gas-liquid separator 16, water and carbon dioxide. And separated.

Next, a specific configuration of the pump device PP of the present invention will be described with reference to FIG.
As described above, the pump device PP partitions the inside of the cylinder 7 into a pair of pressure chambers 7a and 7b by the piston 8, and includes a pair of pump working chambers 7c and 7d adjacent to the pressure chambers 7a and 7b. .
A plunger 9 is integrally provided on the piston 8, and the plunger 9 protrudes from the pressure chambers 7a and 7b and faces the pump action chambers 7c and 7d.
Since the pump working chambers 7c and 7d have the same configuration, only one pump working chamber 7c will be described below.

The pump working chamber 7 c is provided with a bearing 17, and the plunger 9 is slidably supported by the bearing 17.
Further, a cleaning chamber partition member 18 is provided in the pump working chamber 7c, and a plunger 9 is passed through the cleaning chamber partition member 18. The cleaning chamber partition member 18 is formed with a cleaning space 18a, and the plunger 9 penetrates the cleaning space 18a.
The cleaning space 18a is connected to the cleaning liquid supply means 20 via the cleaning passage 19, and the cleaning liquid is supplied from the cleaning liquid supply means 20 to the cleaning space 18a. A variable throttle 21 is connected to the communication process between the cleaning space 18a and the cleaning liquid tank t so as to adjust the communication opening degree between the cleaning space 18a and the cleaning liquid tank t. Therefore, by adjusting the variable throttle 21, the cleaning liquid supplied to the cleaning space 18a can be discharged to the cleaning liquid tank t while controlling the flow rate.

An inflow / outflow port 22 is formed in the pump working chambers 7c and 7d. The inflow / outflow port 22 is a portion connecting the passages 5 and 6 of the wet oxidizer. The slurry is sucked from the passages 5 and 6 through the inflow / outflow port 22 and discharged into the passages 5 and 6. To do.
A seal member 23 made of U packing or a lip seal is provided between the inflow / outflow port 22 and the cleaning space 18a (cleaning chamber partition member 18). This seal member 23 seals the outer periphery of the plunger 9, but when the inflow / outflow port 22 side becomes a high pressure, the lip portion is pushed open under the action of the high pressure to exert a sealing function, The communication between the pump working chambers 7c and 7d and the cleaning space 18a is blocked. However, when the cleaning space 18a has a relatively higher pressure than the pump working chambers 7c and 7d, the seal member 23 does not exhibit a sealing function. In other words, when the cleaning space 18a side has a relatively high pressure, fluid flow from the cleaning space 18a to the pump working chambers 7c and 7d is allowed.
Further, an auxiliary seal member 24 is provided to seal the outer periphery of the plunger 9, and the cleaning space 18 a is positioned between the auxiliary seal member 24 and the seal member 23.
In the figure, reference numeral 25 denotes a spacer provided in the pump working chambers 7c and 7d, and 26 and 27 denote holes for communicating the pressure chambers 7a and 7b with the hydraulic pump P or the tank T.

Next, the operation of the pump device PP configured as described above will be described.
Now, assume that the control valve 10 is switched and hydraulic oil is supplied from the hydraulic pump P to the pressure chamber 7a. Then, the piston 8 and the plunger 9 slide in the suction direction (x direction in the figure) in the pump working chamber 7c by this hydraulic oil. When the plunger 9 slides in the x direction in the drawing in the pump working chamber 7c, the pump working chamber 7c becomes negative pressure and the slurry is sucked into the pump working chamber 7c from the passage 5.
In this state, when the control valve 10 is switched again and hydraulic oil is supplied to the pressure chamber 7b, the piston 8 and the plunger 9 slide in the discharge direction (y direction in the figure) in the pump working chamber 7c. When the plunger 9 slides in the y direction in the drawing in the pump working chamber 7 c, the pump working chamber 7 c and the inflow / outflow port 22 become high pressure, and the slurry in the pump working chamber 7 c is discharged into the passage 5.

At this time, the cleaning liquid is supplied from the cleaning liquid supply means 20 to the cleaning space 18a, and the plunger 9 is reciprocated to clean the outer peripheral portion of the plunger 9 facing the cleaning space 18a.
Further, when the plunger 9 slides in the y direction in the figure, the pump working chamber 7c becomes high pressure. Then, this high pressure acts on the seal member 23, and the lip portion of the seal member 23 is pushed open so as to be in close contact with the outer periphery of the plunger 9, whereby the cleaning space 18a and the inflow / outflow port 22 are shut off.
Therefore, the slurry in the pump working chamber 7c is reliably discharged from the inflow / outflow port 22 without entering the cleaning space 18a.

On the other hand, when the plunger 9 slides in the x direction in the drawing, the pump working chamber 7c becomes negative pressure. Then, since a negative pressure acts on the seal member 23, the seal member 23 does not exhibit a sealing function, and the cleaning space 18a and the inflow / outflow port 22 communicate with each other. Therefore, when the slurry is sucked into the pump working chamber 7c, the cleaning liquid flows from the cleaning space 18a to the inflow / outflow port 22.
As described above, when the cleaning liquid flows from the cleaning space 18a to the pump action chamber 7c when the slurry is sucked, even if the solid substance is caught in the seal member 23, the solid substance is moved to the pump action chamber 7c side. Can be washed away. Therefore, even if solid matter is caught in the sealing member 23, the sealing performance is not impaired.

The amount and pressure of the cleaning liquid supplied from the cleaning liquid supply unit 20 may be determined as appropriate. For example, if the supply amount is increased and the supply pressure is increased, a larger amount of cleaning liquid can be guided to the pump action chamber 7c side, and the solid substance that has been caught can be surely washed away. Moreover, since the cleaning space 18a is sealed by the auxiliary seal member 24, the cleaning liquid does not leak from the cleaning space 18a to the pressure chambers 7a and 7b.
Further, since the variable throttle 21 is provided in the cleaning space 18a, the discharge amount of the cleaning liquid discharged from the cleaning space 18a to the cleaning liquid tank t can be adjusted. Therefore, by controlling the variable throttle 21, the flow rate of the cleaning liquid guided from the cleaning space 18a to the pump working chamber 7c can be adjusted.

For example, when the fluid sucked and discharged from the inflow / outflow port 22 contains almost no solid substance, there is almost no need to clean the seal member 23. Therefore, the opening of the variable throttle 21 is increased, and the cleaning space 18a is increased. The cleaning liquid may be returned directly to the cleaning liquid tank t. In this way, the flow rate of the cleaning liquid guided to the pump working chamber 7c can be reduced.
On the other hand, when the fluid sucked and discharged from the inflow / outflow port 22 contains a large amount of solid substance, the solid substance can be obtained by reducing the opening of the variable throttle 21 and increasing the flow rate of the cleaning liquid led to the pump working chamber 7c. Can be reliably prevented from biting into the seal member 23.

Although the pump working chamber 7c has been described in the above embodiment, it is natural that the same effect can be obtained also in the pump working chamber 7d. However, in the above embodiment, a description has been given using a double-action pump having a pair of pump working chambers 7c and 7d and continuously performing suction and discharge. However, the present invention is not limited to a double-action pump. .
Further, the seal member 23 is constituted by a U-packing or a lip seal. However, the auxiliary seal member 24 is not limited to the U-packing or the like, and the structure thereof is particularly limited as long as it exhibits a sealing function. It is not a thing.

1 is a simplified diagram of a wet oxidation apparatus using a pump according to the present invention. It is a figure which shows the pump of this invention. It is a figure which shows the conventional pump apparatus.

Explanation of symbols

7c, 7d Pump working chamber 9 Plunger 18a Cleaning space 21 Variable throttle 22 Inflow / outflow port 23 Seal member 24 Auxiliary seal member x Suction direction y Discharge direction PP The pump device which is the pump of the present invention

Claims (3)

  A pump working chamber formed in the cylinder, an inflow / outflow port opening to the pump working chamber, a plunger reciprocating in the pump working chamber, and provided adjacent to the pump working chamber and supplying cleaning liquid to the outer periphery of the plunger When the plunger slides in the suction direction, the fluid is sucked into the pump working chamber from the inlet / outlet port, and when the plunger slides in the discharge direction, the fluid in the pump working chamber is discharged. In the pump device that discharges from the inflow / outflow port, a seal member that seals the outer periphery of the plunger is provided between the pump action chamber and the cleaning space, and the seal member is configured to pump when the plunger discharges fluid. When the plunger sucks fluid while the high pressure in the chamber acts to shut off the pump working chamber and the cleaning space, Pump apparatus negative pressure of up working chamber has a configuration that allows the flow of the cleaning liquid into the pumping chamber from the cleaning space acts.   The pump device according to claim 1, wherein an auxiliary seal member is provided on an outer periphery of the plunger, and a cleaning space is positioned between the auxiliary seal member and the seal member.   2. A variable throttle for adjusting a communication opening degree is interposed between the cleaning space and the cleaning liquid tank, and the variable throttle is controlled so that the flow rate of the cleaning liquid flowing from the cleaning space to the pump working chamber can be adjusted. Pumping equipment.

Images