EP0343773B1 - Fluid pump apparatus and valve device - Google Patents
Fluid pump apparatus and valve device Download PDFInfo
- Publication number
- EP0343773B1 EP0343773B1 EP89302606A EP89302606A EP0343773B1 EP 0343773 B1 EP0343773 B1 EP 0343773B1 EP 89302606 A EP89302606 A EP 89302606A EP 89302606 A EP89302606 A EP 89302606A EP 0343773 B1 EP0343773 B1 EP 0343773B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- chamber
- fluid
- pressure
- action
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1002—Ball valves
- F04B53/1015—Combinations of ball valves working in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
- F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1002—Ball valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/141—Intermediate liquid piston between the driving piston and the pumped liquid
Definitions
- This invention relates to fluid pump apparatus.
- Said pressure action member may be a resilient membrane.
- Said pressure-action chamber may be filled on the valve chamber side of the pressure action member with a liquid that has a different specific gravity from that of fluid in the valve chamber, a passage that connects the pressure-action chamber and the valve chamber being provided at a position at which the height relative to the pressure-action chamber and the valve chamber is such that the liquid does not flow into the valve chamber owing to the difference in specific gravity between the liquid and the fluid.
- a pre-chamber may be provided to contain said liquid, the liquid in said pre-chamber communicating with the liquid in said passage.
- valve-piece 12 of the inlet valve 8 can open in the direction of the valve chamber 1 and is therefore urged toward its seat 11 by its valve spring 13 via a valve retainer 15, one end of the valve spring 13 being engaged with the inner wall of the valve chamber 1.
- the valve-piece 12 of the outlet valve 9 opens away from the valve chamber 1 and is therefore urged against its seat 11 by its valve spring 13 being provided between the valve box 2 and a valve cover 16.
- a screening member 29 that uses a mesh screen, for example, to prevent particles that exceed a given size from entering the pressure-action chamber 5a.
- the screening member 29 may be formed as an integral part of the valve box 5 which provides the pressure-action chamber 5a, and the passages 20 therein are set at a downward inclination toward the passage 17 side.
- valve housing 87 and seat 84 are each provided with respective central bolt through-holes 91 and 92 whereby they are bolted together by a bolt 93 and a nut 94.
- valve-pieces 85 and/or the seat 84 may be made of, or covered with, a hard resilient material such as synthetic resin, for example.
- valves 80 and 81 takes the form of small amplitude movements of the numerous valve-pieces 85, vibration accompanying the opening and closing action of the valves can be prevented.
- the use of a plurality of fluid passages in the seat member of at least the inlet valve of the valve chamber means that particles in the fluid that exceed a given size can be removed before reaching the valve chamber.
Description
- This invention relates to fluid pump apparatus.
- Pumps include reciprocating pumps in which the reciprocating action of a piston is used to open and close valves to pump a fluid such as water, for example. In accordance with the configuration of the piston, reciprocating pumps are divided into the bucket type, the plunger type and the piston type.
- Each type of reciprocating pump has its own uses, but in all such pumps the sliding parts are prone to wear. In the prior art, there is known a technique whereby the fluid is prevented from coming into direct contact with the sliding parts of the reciprocating pump, consisting of providing a diaphragm in front of the piston and filling the space on the inner side of the diaphragm with fluid in order to transmit the force of the piston (Japanese Patent Publication No. 48-35405).
- However, in such a configuration the diaphragm is exposed to the fluid, and as a result the diaphragm wears quickly and has to be replaced. The diaphragm has to be replaced especially frequently when the pump is being used in cement mills, for example.
- When plunger pumps, too, are used in cement mills, for example, the rapid wear of packings caused by cement particles has limited pumping pressures to 200 kgf/cm².
- The flow of fluid is limited and controlled by various types of valves. Figures 14 and 15 show a valve device used on plunger pumps, a type of pump which is often used for high-pressure applications. This valve device is constituted by a
tubular seat 100, a valve-piece 102 with a surroundingflange 101, and avalve spring 103 which urges the valve-piece 102 against theseat 100. - Because plunger pumps are used to pump materials such as cement clinker, in the conventional valve device solid particles entrained in the fluid may be caught between the valve-
piece 102 and theseat 100. - The tubular shape of the
seat 100 used in the conventional valve device makes it easy for solid particles to pass through. In addition, because theseat 100 and the valve-piece 102 are made of metal, the operation of the valve may be adversely affected by solid particles that are caught therebetween. The result is that it has sometimes been impossible to pump a constant amount of fluid at a constant rate, so that operation of the pump was accompanied by a decline in efficiency. Furthermore, solid particles caught between theseat 100 and the valve-piece 102 can damage the seat and valve-piece, leading to leakage of fluid. Conventionally, therefore, the valve device has to be replaced at this point, which interrupts operations. - EP-A-0 309 240 (which claims an earlier priority date than the present application but was published after any priority date of the present application) discloses a valve device for preventing the inflow of solid particles present in fluid and increasing the durability of the device. Such a valve device (see Figures 16 and 17) comprises a
seat 107 having avalve seat 104 formed as aconcave surface 105 corresponding to part of a spherical surface, and a prescribed number offluid passages 106 which are formed in theseat 107 and open into theconcave surface 105. There are also a valve-piece 108 that has a surface corresponding to the shape of theconcave surface 105 of thevalve seat 104, and avalve cover 110 andspring retainer 111 that maintain the valve-piece 108 on theconcave surface 105 of theseat 104 via avalve spring 109. In the valve device thus configured, at least one of theseat 107 and the valve-piece 108 is either formed of, or covered with, a hard resilient material, or one is formed of a hard resilient material and the other is covered with a hard resilient material. In addition, wood may be used instead of the hard resilient material. - With the valve device thus configured, the
fluid passages 106 formed in theseat 107 have a small diameter which makes it difficult for solid particles to pass therethrough. Even if solid particles should pass through thefluid passages 106 and get caught between theseat 107 and the valve-piece 108, the resilience of the valve seat and/or the valve-piece ensures that the functioning of the valve device will not be obstructed. However, a valve device thus configured is less adequate for pumping at higher pressures because increasing the amount being pumped can cause the valve-piece 108 to vibrate during the inflow of fluid. - GB-A- 272 374 and DE-C- 805 006 each discloses fluid pump apparatus having the pre-characterising features of
claim 1. - According to the present invention there is provided fluid pump apparatus comprising:-
a piston;
a cylinder in which the piston reciprocates;
a valve chamber having an inlet and an outlet, each provided with a valve;
a partitioning pressure action member provided between the cylinder and the valve chamber in a pressure-action chamber, the member being acted on as a result of reciprocation of the piston to cause fluid to be drawn into the valve chamber and fluid to be pumped from the valve chamber; and
a screening member provided between the pressure action member and the valve chamber so that only particles in the fluid that do not exceed a prescribed size can pass through the screening member, characterised in that at least the valve of the inlet of the valve chamber comprises:- - (a) a seat member in a face of which are formed a plurality of valve seats, each of said seats having a concave shape that corresponds to part of a spherical surface;
- (b) a plurality of fluid passages in said seat member, for each of said valve seats there being a respective plurality of such fluid passages in the seat member and communicating with the valve seat;
- (c) a plurality of valve pieces, each of the valve pieces being in a respective one of said valve seats and each having a spherical surface that corresponds to the surface of the valve seat; and
- (d) a valve housing provided with resilient means that resiliently presses the valve pieces on to the surfaces of the respective ones of the valve seats.
- The pressure-action chamber may contain on the cylinder side of the pressure action member an operating medium that transmits the actuation of the piston.
- Said pressure action member may be a resilient membrane.
- Said pressure-action chamber may be filled on the valve chamber side of the pressure action member with a liquid that has a different specific gravity from that of fluid in the valve chamber, a passage that connects the pressure-action chamber and the valve chamber being provided at a position at which the height relative to the pressure-action chamber and the valve chamber is such that the liquid does not flow into the valve chamber owing to the difference in specific gravity between the liquid and the fluid.
- A pre-chamber may be provided to contain said liquid, the liquid in said pre-chamber communicating with the liquid in said passage.
- Separating means may be provided between said liquid and said fluid that conforms to changes in level.
- Said screening member may be formed integrally with means providing said pressure-action chamber.
- The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:-
- Figure 1 is a sectional view of an embodiment of fluid pump apparatus not according to the present invention;
- Figure 2 is an enlarged sectional view of part of the apparatus shown in Figure 1;
- Figure 3 is a sectional view of part of a second embodiment of fluid pump apparatus not according to the present invention;
- Figure 4 is a sectional view of a third embodiment of fluid pump apparatus not according to the present invention;
- Figure 5 is a sectional view of a fourth embodiment of fluid pump apparatus not according to the present invention, Figure 6 being a view of a detail of the apparatus;
- Figure 7 is a sectional view of an embodiment of fluid pump apparatus according to the present invention in the form of an ultrahigh pressure pump;
- Figure 8 is a sectional view of a valve device shown in Figure 7;
- Figure 9 is a perspective view of the valve device of Figure 8, shown disassembled;
- Figure 10 is a plan view of a valve housing shown in Figure 9;
- Figure 11 is a sectional view taken along line A--A of Figure 10;
- Figure 12 is a plan view of a seat shown in Figure 8;
- Figure 13 is a sectional view taken along line A--A of Figure 12;
- Figures 14 and 15 are a sectional view and a disassembled perspective view of a conventional valve device; and
- Figures 16 and 17 are a sectional view and a disassembled perspective view of a valve device for apparatus not according to the present invention.
- Figure 1 is a sectional view of a plunger pump used for pumping fluid containing a high level of particles, such as cement particles, for example.
- In Figure 1, fluid pump apparatus comprises a
valve box 2 provided with avalve chamber 1, aplunger box 4 provided with a piston in the form of aplunger 3, and abox 5 providing a pressure-action chamber 5a disposed between thevalve box 2 and theplunger box 4. - The
valve box 2 has aninlet passage 6 and anoutlet passage 7 that communicate with thevalve chamber 1 and which are provided with aninlet valve 8 and anoutlet valve 9, respectively. Theinlet valve 8 and theoutlet valve 9 each have aseat 11 which is formed with a valve seat having a concave, semi-spherical shape and in which there are a multiplicity ofsmall holes 10 that extend axially from the concave valve seat; a valve-piece 12 that has a spherical shape corresponding to the concave valve seat; and avalve spring 13 that urges the valve-piece 12 against the valve seat. Theholes 10 are for limiting the entry into thevalve chamber 1 of particles in thefluid 14 that exceed a given size. - The valve-
piece 12 of theinlet valve 8 can open in the direction of thevalve chamber 1 and is therefore urged toward itsseat 11 by itsvalve spring 13 via avalve retainer 15, one end of thevalve spring 13 being engaged with the inner wall of thevalve chamber 1. The valve-piece 12 of theoutlet valve 9 opens away from thevalve chamber 1 and is therefore urged against itsseat 11 by itsvalve spring 13 being provided between thevalve box 2 and avalve cover 16. - Provided in the
side wall 2a of thevalve box 2 is apassage 17 that connects the pressure-action chamber 5a with the interior of thevalve chamber 1, thepassage 17 opening into the lower part of arecess 18 formed in theside wall 2a of thevalve box 2. - The
box 5 that provides the pressure-action chamber 5a is provided with a screeningmember 19 disposed between therecess 18 and the pressure-action chamber 5a, as shown in the enlarged view of Figure 2. A mesh screen, for example, is used for the screeningmember 19, and formed therein arepassages 20 to prevent the entry into the pressure-action chamber 5a of particles that exceed a given size. Thepassages 20 may be formed integrally in the side of thevalve box 5, and are set at a prescribed inclination toward thepassage 17 side. - The end of
plunger 3 maintained within acylinder 21 in theplunger box 4 via a V-packing 22 projects into the pressure-action chamber 5a and is reciprocated at high speed by drive means (not illustrated). - A
resilient membrane 23 is provided in the pressure-action chamber 5a to divide the pressure-action chamber 5a into acylinder 21 side A and avalve chamber 1 side B. Thechamber 5a is filled on thecylinder 21 side A of theresilient membrane 23 with an operatingmedium 25, such as oil, via anoil passage 24 of theplunger box 4. - With the above configuration, when suction operation of the
plunger 3 causes theresilient membrane 23 to contract, reducing the volume on thecylinder 21 side A of the pressure-action chamber 5a, a corresponding amount offluid 14 flows into thevalve chamber 1. At this time, particles in the fluid 14 that exceed a given size cannot pass through theseat 11 of thevalve 8 and are thus prevented from flowing into thevalve chamber 1. Also, as particles in the fluid 14 that exceed a given size cannot pass through the screeningmember 19, any such particles influid 14 that flow into thevalve chamber 1 cannot enter the valve chamber side B of the pressure-action chamber 5a. - The expulsion operation of the
plunger 3 expands theresilient membrane 23, causingfluid 14 that has entered thevalve chamber 1 to be expelled from thevalve chamber 1. - In Figure 3, parts that are the same as parts shown in Figure 1 have been given the same reference numerals. In the second embodiment, a
resilient membrane 26 directly covers theplunger 3 and the reciprocating action of theplunger 3 directly expands theresilient membrane 26. In this embodiment, thepassages 20 provided in ascreening member 27 are not disposed facing thepassage 17 but are instead located higher, which fully prevents the entry of any particles in thefluid 14. When pumping operations are being carried out where there are high levels of particles, such as in a cement mill, large particles contained in the fluid 14 can be fully prevented from entering thevalve chamber 1 side B by filling thevalve chamber 1 side B of the pressure-action chamber 5a with a liquid such as water that contains no particles, prior to the start of the pumping. - In Figure 4, parts that are the same as parts shown in Figure 1 have been given the same reference numerals. In this third embodiment, the
side wall 2a of thevalve box 2 is provided with apassage 17 that connects the pressure-action chamber 5a with thevalve chamber 1. As explained below, the position of thepassage 17 is determined according to the difference in specific gravity between a liquid 28 and the fluid 14. When the liquid has a higher specific gravity than the fluid, thepassage 17 is located at a higher position in the pressure-action chamber 5a, and when the liquid 28 has a lower specific gravity thepassage 17 is positioned lower. In the illustrated example, the position where thepassage 17 opens into the pressure-action chamber 5a is higher than the inlet of thevalve chamber 1. Thus, in this embodiment, the position of thepassage 17 is determined according to the relationship between the heights of the pressure-action chamber 5a and thevalve chamber 1 and a consideration of the specific gravities of the liquid 28 and the fluid 14. - The end of the
plunger 3 maintained within thecylinder 21 in theplunger box 4 via V-packing 22 projects into the pressure-action chamber 5a and is reciprocated at high speed by drive means (not illustrated). - A
resilient membrane 23 is provided in the pressure-action chamber 5a to divide the pressure-action chamber 5a into acylinder 21 side A and avalve chamber 1 side B. Thechamber 5a is filled on thecylinder 21 side A of theresilient membrane 23 with an operatingmedium 25, such as oil, via anoil passage 24 of theplunger box 4. In addition, thechamber 5a on thevalve chamber 1 side B of themembrane 23 and part of thepassage 17 are filled with the liquid 28, such as oil, which has a lower specific gravity than the fluid 14 used in a cement mill, for example, and does not mix with the fluid 14. The liquid 28 comes into contact with the fluid 14 part-way along thepassage 17. - Provided between the pressure-
action chamber 5a and thepassage 17 is a screeningmember 29 that uses a mesh screen, for example, to prevent particles that exceed a given size from entering the pressure-action chamber 5a. The screeningmember 29 may be formed as an integral part of thevalve box 5 which provides the pressure-action chamber 5a, and thepassages 20 therein are set at a downward inclination toward thepassage 17 side. - With the above configuration, suction operation of the
plunger 3 causes theresilient membrane 23 to contract, reducing the volume on thecylinder 21 side A of the pressure-action chamber 5a and increasing the volume on thevalve chamber 1 side B. The change in volume results in a rise in the level of the liquid 28 in thepassage 17. Also, an amount offluid 14 corresponding to the change in volume flows into thevalve chamber 1 as theinlet valve 8 opens. The expulsion operation of theplunger 3 causes theresilient membrane 23 to expand via the operatingmedium 25 and, with the reduction in the volume of thevalve chamber 1 side B, the liquid 28 in thevalve chamber 1 side B of the pressure-action chamber 5a is expelled. Also, the level of the liquid 28 in thepassage 17 decreases and a corresponding amount offluid 14 is forced out as theoutlet valve 9 opens. The liquid 28 is only forced part-way along thepassage 17 and does not flow over to thevalve chamber 1 side. - In Figure 5, parts that are the same as parts shown in Figure 1 have been given the same reference numerals. In this embodiment, a pre-chamber 30 filled with the liquid 28 is also provided on the outside of the
valve box 5. The pre-chamber 30 communicates with the liquid 28 in thepassage 17 by means of abranch pipe 31. With this embodiment, the point of confluence of the liquid 28 and the fluid 14 does not move above the pre-chamber 30, and therefore the liquid 28 in the pressure-action chamber 5a can be kept fresh by changing the liquid 28 in the pre-chamber 30. - Figure 6 illustrates the insertion of a liquid 32 having a specific gravity that is midway between the specific gravities of the liquid 28 and the fluid 14 and which, in addition, does not mix with the fluid 14. With this arrangement, there is no direct contact between the liquid 28 and the fluid 14. A partitioning medium disposed between the liquid 28 and the fluid 14 may be used in place of the liquid 32.
- In the above embodiments, a liquid 28 is used having a lower specific gravity than the fluid 14, but a liquid having a higher specific gravity than the fluid 14 may also be used. In such a case, the passage connecting the pressure-
action chamber 5a with thevalve chamber 1 should be provided towards the upper part of the pressure-action chamber 5a. A premise for such an arrangement is that the positional relationship between the height of the pressure-action chamber 5a and thevalve chamber 1 will be adjusted. - Figure 7 shows an embodiment of the present invention in the form of an ultrahigh pressure pump for use in cement mills, for example. In Figure 7, parts that are the same as parts shown in Figure 1 have been given the same reference numerals. In this embodiment, the ultrahigh pressure pump consists of a
valve box 2 that has avalve chamber 1; aplunger box 4 containing a piston in the form of aplunger 3; and avalve box 5 providing a pressure-action chamber 5a that is disposed between thevalve box 2 and theplunger box 4. - The
valve box 2 has aninlet passage 6 and anoutlet passage 7 that communicate with thevalve chamber 1 and which are provided with aninlet valve 80 and anoutlet valve 81, respectively. As shown in Figures 8 to 13, theinlet valve 80 and theoutlet valve 81 each have aseat 84 in theface 82 which are formed a multiplicity of valve seats 83 (eight, in the illustrated example) spaced at regular intervals around the edge, each shaped into a concave form that corresponds to part of a spherical surface; spherical valve-pieces 85 arranged on the valve seats 83; and avalve housing 87 that presses the valve-pieces 85 on to the valve seats 83 by means ofsprings 86. - In each of the valve seats 83 in the
seat 84, there are formed multiple fluid passages 88 (three in each case, in the illustrated example) that extend axially throughout theseat 84. Disposed around the edge of thevalve housing 87 arefluid passages 89 corresponding to the valve seats 83 and into which the valve-pieces 85 fit. The exit end of each of thefluid passages 89 is formed into a smaller diameter portion by alip 90. One end of each of the valve springs 86 is held in place at arespective lip 90. - The
valve housing 87 andseat 84 are each provided with respective central bolt through-holes bolt 93 and anut 94. - In addition to metal, the valve-
pieces 85 and/or theseat 84 may be made of, or covered with, a hard resilient material such as synthetic resin, for example. - In the
side wall 2a of thevalve box 2 is apassage 17 that connects the pressure-action chamber 5a with the interior of thevalve chamber 1, and provided at the opening of the passage at the pressure-action chamber 5a end is a screeningmember 29 constituted of a mesh screen or the like that limits the entry of particles that exceed a given size. - The end of
plunger 3 maintained within acylinder 21 in theplunger box 4 via a V-packing 22 projects into the pressure-action chamber 5a and is reciprocated at high speed by drive means (not illustrated). - A
resilient membrane 23 is provided in the pressure-action chamber 5a to divide the pressure-action chamber 5a into acylinder 21 side A and thevalve chamber 1 side B. Thechamber 5a on thecylinder 21 side A of theresilient membrane 23 is filled with an operatingmedium 25, such as oil. Also, thechamber 5a on thevalve chamber 1 side B of themembrane 23 is filled with a liquid such as oil having a specific gravity that differs from that of the fluid, so that the pumped fluid does not enter the pressure-action chamber 5a. - With the above configuration, when suction operation of the
plunger 3 causes theresilient membrane 23 to contract, reducing the volume on thecylinder 21 side A of the pressure-action chamber 5a, the result is that the valve-pieces 85 of theinlet valve 80 open against the resistance of thesprings 86, andcement mill fluid 14 flows into thevalve chamber 1. At this time, the valve-pieces 85 of theoutlet valve 81 are drawn in the direction of their closed positions, and therefore remain closed. Before the fluid can flow into thevalve chamber 1, entrained particles that exceed a given size are removed by thefluid passages 88. - The expulsion operation of the
plunger 3 expands theresilient membrane 23, causingfluid 14 that has entered thevalve chamber 1 to open theoutlet valve 81 and be pumped out. - Because the operation of the
valves pieces 85, vibration accompanying the opening and closing action of the valves can be prevented. - Advantages of the above embodiments are as follows.
- The provision of a screening member stops the entry of particles in the fluid that exceed a given size, thus preventing large particles from coming into direct contact with the pressure action member (in the form of a membrane) and eliminating a source of wear and damage to the pressure-action member, and as such increasing durability. It can allow pressures of around 500kgf/cm² to be achieved, and therefore can provide major improvements in efficiency if employed for pumping operations in civil engineering projects.
- The provision of a resilient membrane as the pressure action member ensures reliable transmission of the piston action.
- Using a specific gravity differential between the fluid and a liquid on the valve chamber side of the pressure action member can prevent the liquid flowing from the pressure-action chamber into the valve chamber, so that there is no inflow of the fluid into the pressure-action chamber, and hence no wear and tear to the frictional parts of the piston. This results in a major boost in pump output levels, compared to conventional apparatus.
- The freshness of the liquid in the pressure-action chamber can be maintained by changing the liquid in a pre-chamber, while using separating means between the liquid and the fluid can provide a reliable way to prevent mingling between liquid and fluid.
- Using a suitable operating medium on the cylinder of the pressure-action chamber can provide for piston lubrication.
- The use of a plurality of fluid passages in the seat member of at least the inlet valve of the valve chamber means that particles in the fluid that exceed a given size can be removed before reaching the valve chamber.
- The use of a plurality of valve seats, each with a respective plurality of fluid passages, enables valve-piece vibration to be prevented, and can provide reliable function and increased durability.
Claims (8)
- Fluid pump apparatus comprising:-
a piston (3);
a cylinder (21) in which the piston reciprocates;
a valve chamber (1) having an inlet (6) and an outlet (7), each provided with a valve (80 or 81);
a partitioning pressure action member (23 or 26) provided between the cylinder and the valve chamber in a pressure-action chamber (5a), the member being acted on as a result of reciprocation of the piston to cause fluid to be drawn into the valve chamber and fluid to be pumped from the valve chamber; and a screening member (19 or 27 or 29) provided between the pressure action member and the valve chamber so that only particles in the fluid that do not exceed a prescribed size can pass through the screening member, characterised in that at least the valve of the inlet of the valve chamber comprises:-(a) a seat member (84) in a face of which are formed a plurality of valve seats (83), each of said seats having a concave shape that corresponds to part of a spherical surface;(b) a plurality of fluid passages (88) in said seat member, for each of said valve seats there being a respective plurality of such fluid passages in the seat member and communicating with the valve seat;(c) a plurality of valve pieces (85), each of the valve pieces being in a respective one of said valve seats and each having a spherical surface that corresponds to the surface of the valve seat; and(d) a valve housing (87) provided with resilient means (86) that resiliently presses the valve pieces on to the surfaces of the respective ones of the valve seats. - Fluid pump apparatus according to claim 1, characterised in that said pressure-action chamber (5a) contains on the cylinder side (A) of the pressure action member (23) an operating medium (25) that transmits the actuation of the piston (3).
- Fluid pump apparatus according to claim 1 or 2, characterised in that said pressure action member (23 or 26) is a resilient membrane.
- Fluid pump apparatus according to claim 1, characterised in that said pressure action member (26) is a resilient membrane that is pushed directly by the piston (3).
- Fluid pump apparatus according to any preceding claim, characterised in that said pressure-action chamber (5a) is filled on the valve chamber side (B) of the pressure action member (23) with a liquid (28) that has a different specific gravity from that of fluid (14) in the valve chamber (1) and a passage (17) that connects the pressure-action chamber and the valve chamber is provided at a position at which the height relative to the pressure-action chamber and the valve chamber is such that the liquid does not flow into the valve chamber owing to the difference in specific gravity between the liquid and the fluid.
- Fluid pump apparatus according to claim 5, characterised in that a pre-chamber (30) is provided to contain said liquid (28) and the liquid in said pre-chamber communicates with the liquid in said passage (17).
- Fluid pump apparatus according to claim 5 or 6, characterised in that separating means (32) is provided between said liquid (28) and said fluid (14) that conforms to changes in level.
- Fluid pump apparatus according to any preceding claim, characterised in that said screening member (19 or 27 or 29) is formed integrally with means (5) providing said pressure-action chamber (5a).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP90201581A EP0390298B1 (en) | 1988-03-23 | 1989-03-16 | Fluid pump apparatus |
EP90201568A EP0393800B1 (en) | 1988-03-23 | 1989-03-16 | Valve device |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP68882/88 | 1988-03-23 | ||
JP63068882A JP2557250B2 (en) | 1988-03-23 | 1988-03-23 | Fluid pumping device |
JP63077076A JP2632540B2 (en) | 1988-03-30 | 1988-03-30 | Fluid pumping equipment |
JP77076/88 | 1988-03-30 | ||
JP103232/88 | 1988-04-26 | ||
JP63103232A JPH07113426B2 (en) | 1988-04-26 | 1988-04-26 | Valve device |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90201581.7 Division-Into | 1989-03-16 | ||
EP90201568.4 Division-Into | 1989-03-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0343773A1 EP0343773A1 (en) | 1989-11-29 |
EP0343773B1 true EP0343773B1 (en) | 1993-11-18 |
Family
ID=27299893
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89302606A Expired - Lifetime EP0343773B1 (en) | 1988-03-23 | 1989-03-16 | Fluid pump apparatus and valve device |
EP90201581A Expired - Lifetime EP0390298B1 (en) | 1988-03-23 | 1989-03-16 | Fluid pump apparatus |
EP90201568A Expired - Lifetime EP0393800B1 (en) | 1988-03-23 | 1989-03-16 | Valve device |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90201581A Expired - Lifetime EP0390298B1 (en) | 1988-03-23 | 1989-03-16 | Fluid pump apparatus |
EP90201568A Expired - Lifetime EP0393800B1 (en) | 1988-03-23 | 1989-03-16 | Valve device |
Country Status (5)
Country | Link |
---|---|
EP (3) | EP0343773B1 (en) |
KR (1) | KR0181711B1 (en) |
AU (1) | AU626838B2 (en) |
CA (1) | CA1338102C (en) |
DE (3) | DE68910726T2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5368454A (en) * | 1992-07-31 | 1994-11-29 | Graco Inc. | Quiet check valve |
DE19604132C2 (en) * | 1996-02-06 | 2000-04-13 | Hammelmann Paul Maschf | High pressure plunger pump, preferably for working pressures above 2,000 bar |
WO1999018573A1 (en) * | 1997-10-02 | 1999-04-15 | Sony Corporation | Recording/reproducing device and recording/reproducing method |
SE518114C2 (en) * | 1998-09-28 | 2002-08-27 | Asept Int Ab | Pumping device for pumping liquid food |
US20110030213A1 (en) * | 2009-08-07 | 2011-02-10 | Weir Spm, Inc. | Hydraulic installation tool for pump plunger |
CN105934618B (en) | 2013-11-26 | 2018-09-21 | S.P.M.流量控制股份有限公司 | Valve seat in fracturing pump |
CN106050596B (en) * | 2016-06-07 | 2018-05-25 | 神华集团有限责任公司 | Plunger metering pump |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE520270A (en) * | ||||
FR959521A (en) * | 1950-03-31 | |||
GB272374A (en) * | 1926-09-21 | 1927-06-16 | Nouvelle Soc Des Ateliers Patt | Improvements in mud pumps |
DE805006C (en) * | 1950-01-20 | 1951-05-04 | Westfalia Dinnendahl Groeppel | Diaphragm pump |
US3298320A (en) * | 1965-05-17 | 1967-01-17 | Little Inc A | Atraumatic fluid pump |
US3363580A (en) * | 1966-01-19 | 1968-01-16 | Denver Equip Co | Multiple valve pump |
US3520643A (en) * | 1968-10-22 | 1970-07-14 | Passavant Werke | Sewage pump or the like |
US3664770A (en) * | 1970-02-18 | 1972-05-23 | Golden Arrow Mfg Ltd | Diaphragm pumps |
JPS5018604B1 (en) * | 1971-06-24 | 1975-07-01 | ||
US3802807A (en) * | 1972-06-02 | 1974-04-09 | Precision Control Prod Corp | Pump |
US4378183A (en) * | 1980-09-18 | 1983-03-29 | The Pittsburgh & Midway Coal Mining Co. | Apparatus and method for pumping hot, erosive slurry of coal solids in coal derived, water immiscible liquid |
FR2512123A1 (en) * | 1981-08-27 | 1983-03-04 | Scumra | MEMBRANE VOLUMETRIC PUMP FOR FRAGILE PARTICLE SUSPENSIONS |
JPH0819900B2 (en) * | 1986-02-20 | 1996-03-04 | サン−ゴバン・ヴイトラ−ジユ | Reciprocating vane pump for high viscosity materials |
JPH0198773A (en) * | 1987-09-22 | 1989-04-17 | Yoshinobu Koiwa | Valve device |
-
1989
- 1989-03-16 DE DE89302606T patent/DE68910726T2/en not_active Expired - Fee Related
- 1989-03-16 DE DE68917587T patent/DE68917587T2/en not_active Expired - Fee Related
- 1989-03-16 EP EP89302606A patent/EP0343773B1/en not_active Expired - Lifetime
- 1989-03-16 DE DE68920306T patent/DE68920306T2/en not_active Expired - Fee Related
- 1989-03-16 EP EP90201581A patent/EP0390298B1/en not_active Expired - Lifetime
- 1989-03-16 EP EP90201568A patent/EP0393800B1/en not_active Expired - Lifetime
- 1989-03-18 KR KR1019890003401A patent/KR0181711B1/en not_active IP Right Cessation
- 1989-03-21 CA CA000594378A patent/CA1338102C/en not_active Expired - Fee Related
- 1989-03-22 AU AU31606/89A patent/AU626838B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
AU3160689A (en) | 1989-09-28 |
DE68910726D1 (en) | 1993-12-23 |
DE68917587D1 (en) | 1994-09-22 |
AU639071B2 (en) | 1993-07-15 |
EP0390298A2 (en) | 1990-10-03 |
EP0393800B1 (en) | 1994-08-17 |
DE68920306D1 (en) | 1995-02-09 |
AU626838B2 (en) | 1992-08-13 |
EP0390298A3 (en) | 1990-10-31 |
EP0393800A2 (en) | 1990-10-24 |
KR890014899A (en) | 1989-10-25 |
DE68920306T2 (en) | 1995-05-18 |
KR0181711B1 (en) | 1999-05-01 |
EP0390298B1 (en) | 1994-12-28 |
DE68910726T2 (en) | 1994-03-24 |
AU7113391A (en) | 1991-05-02 |
CA1338102C (en) | 1996-03-05 |
EP0393800A3 (en) | 1990-11-07 |
EP0343773A1 (en) | 1989-11-29 |
DE68917587T2 (en) | 1994-12-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4948349A (en) | Pump and valve apparatus | |
US5839468A (en) | Pump valve | |
US6132094A (en) | Multiple groove thrust bearing | |
JPH11513455A (en) | Diaphragm pump | |
EP0343773B1 (en) | Fluid pump apparatus and valve device | |
US2764097A (en) | Pump | |
US4527957A (en) | Piston pump | |
JPH01275974A (en) | Valve device | |
WO2001012990A1 (en) | Diaphragm pump | |
CA1338322C (en) | Fluid pump apparatus and valve device | |
US5769614A (en) | High pressure pump | |
WO2003038320A1 (en) | Method and device at a hydrodynamic pump piston | |
SE430528B (en) | DOUBLE-OPERATING DIFFERENTIAL PISTON PUMP | |
US5340291A (en) | Flow restraining device for a thick matter conveying apparatus | |
US4448212A (en) | Check valve for use with high pressure pump | |
JP2632540B2 (en) | Fluid pumping equipment | |
CA1326433C (en) | Valve apparatus | |
US4906167A (en) | Inherently flushing piston rod for a reciprocating pump | |
JP2654818B2 (en) | Fluid pumping equipment | |
JP2557250B2 (en) | Fluid pumping device | |
US6485272B2 (en) | Fluid proportioner | |
JP2671055B2 (en) | Fluid pumping equipment | |
US4965042A (en) | Inherently flushing piston rod for a reciprocating pump | |
JPS6019973A (en) | Diaphragm pump | |
US783990A (en) | Pump. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE FR GB IT LI SE |
|
17P | Request for examination filed |
Effective date: 19900522 |
|
17Q | First examination report despatched |
Effective date: 19910226 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CH DE FR GB IT LI SE |
|
REF | Corresponds to: |
Ref document number: 68910726 Country of ref document: DE Date of ref document: 19931223 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed |
Owner name: STUDIO TORTA SOCIETA' SEMPLICE |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
EAL | Se: european patent in force in sweden |
Ref document number: 89302606.2 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19960318 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19970317 |
|
EUG | Se: european patent has lapsed |
Ref document number: 89302606.2 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19990317 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19990331 Year of fee payment: 11 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000316 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20000316 Year of fee payment: 12 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000331 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000331 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20000331 Year of fee payment: 12 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20000316 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011130 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050316 |