JP4085631B2 - Combined pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite pump that performs a suction operation and a discharge operation by changing a volume in a pump chamber by vibrating a movable wall such as a piston or a diaphragm by an actuator such as a piezoelectric element.
[0002]
[Prior art]
A reciprocating pump that drives a movable wall, such as a diaphragm pump, in which the amount that can be discharged by one pumping is determined by the volume of the pump that is excluded (the volume that is removed when the movable wall is displaced) By increasing the flow rate and sucking the discharged fluid volume in a shorter time, the suction / discharge cycle frequency of the pump can be increased, and the output can be increased.
[0003]
On the other hand, the suction flow rate is proportional to the pressure difference between the upstream and downstream of the fluid resistance element (valve, fluid diode, diffuser, etc.) arranged on the suction port side of the pump, but the pump internal pressure downstream of the fluid resistance element is Since it is difficult to reduce the absolute pressure to 0 atm or less due to the occurrence of cavitation, etc., it has been generally considered to increase the upstream side of the fluid resistance element in order to increase the suction flow rate. Conventionally, in order to increase the pressure upstream of the fluid resistance element, a high pressure is applied to the entire upstream flow path.
In addition, the “Research on Hydraulic Actuators Using Piezoelectric Elements as Power Sources” on page 213 of Vol. 59, No. 564 of the Japan Society of Mechanical Engineers (edition C) (referred to as the prior application technology) Is connected, and a pressure wave with a large amplitude is generated in the resonance pipe, thereby increasing the pressure upstream of the fluid resistance element arranged in the suction portion to increase the suction flow rate and increase the pump output. It is described.
[0004]
[Problems to be solved by the invention]
However, the conventional method of applying high pressure to the entire upstream flow path requires a pressure generator, and the entire upstream flow path must be designed to withstand high pressure. There is a problem of doing.
In addition, the above-mentioned prior application technique generates a resonance frequency optimum for the target pump driving frequency by changing the material of the resonance pipe and the pipe length in order to increase the pressure upstream of the fluid resistance element. There is a problem that once the resonant pipe is connected, the drive frequency of the pump cannot be freely changed. Moreover, since the pipe length becomes long, there is a problem that the pump cannot be downsized.
[0005]
The present invention has been made in view of the above circumstances, and achieves high output by increasing the suction flow rate by increasing the pressure difference between the upstream and downstream of the fluid resistance element arranged at the pump suction port while reducing the size. An object of the present invention is to provide a composite pump in which the pump drive frequency can be freely changed.
[0006]
[Means for Solving the Problems]
  In order to solve the above-mentioned problem, the invention according to the first aspect includes a drive unit for reciprocating a movable wall such as a piston or a diaphragm, a pump chamber whose volume can be changed by the reciprocating operation of the movable wall, At least three or more pumps including a pump suction port through which the working fluid flows into the pump chamber, a pump discharge port through which the working fluid flows out from the pump chamber, and a fluid resistance element provided at the pump suction port are disposed. A composite pump having a single suction channel, and an external inlet through which a working fluid flows from the outside is connected to the suction channel, and the pump suction port of each pump is connected to the suction channel. Are connected to a position surrounding the external inlet at positions separated from each other, and the drive parts of each pump are driven with a phase difference in order in a certain direction.The pump suction port of each pump is formed obliquely toward the direction opposite to the fixed drive direction for driving the drive unit of each pump, and the pump suction port is opened at the composite pump chamber side. The opening that is open is positioned forward in the direction toward the opposite side of the opening that opens on the suction flow path side.This is a combined pump.
[0007]
The invention according to claim 2 is the composite pump according to claim 1, wherein the position where the pump suction port of each pump is connected to the suction flow path is the position where the external inlet is connected. The position is approximately equidistant from the center.
The invention according to claim 3 is the composite pump according to claim 1 or 2, wherein the external inlet is connected to a position where the pump inlet of each pump is connected to the inlet passage. Positions at substantially equal intervals on the circumference of a predetermined radius centered on the existing position.
[0008]
According to a fourth aspect of the present invention, in the composite pump according to any one of the first to third aspects, the external inflow port is connected to a substantially central position of the suction flow path, and the pump suction of each pump. The position where the mouth is connected to the suction channel is the edge of the suction channel away from the external inlet.
According to a fifth aspect of the present invention, in the composite pump according to any one of the first to fourth aspects, the suction flow path is formed as a substantially disk-shaped space.
[0009]
The invention according to claim 6 is the composite pump according to claim 5, wherein the external inflow port is connected to one of a pair of opposed walls facing each other inside the suction flow path, and the pair of opposed walls The pump suction port of each pump was connected to the other side.
The invention according to claim 7 is the composite pump according to claim 5, wherein the external inflow port is connected to one of a pair of opposed walls facing each other inside the suction flow path, and the pair of opposed walls The pump suction port of each pump was connected to a peripheral wall provided between the two.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A plurality of embodiments according to the present invention will be described below with reference to the drawings.
First, FIG. 1 shows a structure of a general pump 2 using a piezoelectric element as a drive source in a longitudinal section. A piezoelectric element 6 is disposed at the bottom of a cylindrical case 4, and an upper portion of the piezoelectric element 6 is shown. A circular diaphragm 8 is arranged in a state of being laminated on the substrate. The diaphragm 8 is elastically deformable with its outer peripheral edge fixedly supported on the inner wall of the case 4.
[0012]
A narrow space between the diaphragm 8 and the upper wall of the case 4 is a pump chamber 10. A pump suction port 14 provided with a suction-side check valve 12 and a discharge-side check valve 16 are directed toward the pump chamber 10. And a pump discharge port 18 provided with Here, the suction side check valve 12 corresponds to a fluid resistance element of the present invention.
The operation of the pump 2 is as follows. When the diaphragm 8 vibrates by supplying an AC voltage to the piezoelectric element 6, and the diaphragm 8 is displaced downward in FIG. 1, the pressure in the pump chamber 10 is upstream from the suction side check valve 12. Therefore, the working fluid flows into the pump chamber 10 from the pump suction port 14 in a suction stroke in which the discharge side check valve 16 is closed and the suction side check valve 12 is opened. In FIG. 1, when the diaphragm 8 is displaced upward, the pressure in the pump chamber 10 becomes higher than the pressure downstream from the discharge side check valve 16, so that the suction side check valve 12 is closed and the discharge side check valve 16 is opened. The working fluid in the pump chamber 10 flows out from the pump discharge port 18 in the state of the discharge stroke.
[0013]
  Next, what is shown in FIGS. 2 to 4 relates to the present invention using three pumps 2A, 2B, and 2C based on the pump 2 of FIG.Reference example 1The composite pump 20 is shown. Figure 2 shows the bookReference exampleFIG. 3 is a diagram schematically showing the composite pump 20 in plan view, and FIG. 3 is a diagram showing the composite pump 20 in FIG. Here, the white circle (circle) in Fig. 2 is the bookReference exampleIndicates the pump suction port, and the black circle (marked with ●)Reference exampleThe pump discharge port is shown.
[0014]
  BookReference exampleThe composite pump 20 has three piezoelectric elements 6a at equal intervals on a predetermined circumference in plan view at the bottom of the space in the case 22 defined by the wall 22a rising from the center of the bottom. , 6b, 6c (piezoelectric element 6c is not shown), and circular diaphragms 8a, 8b, 8c are arranged above the piezoelectric elements 6a, 6b, 6c.
  Each diaphragm 8a, 8b, 8c has an outer peripheral edge fixed to the inner wall of the case 22, and an inner peripheral circle supported by the cylindrical wall 22a so as to be elastically deformable. A drive control unit 30 that supplies an alternating voltage at a predetermined timing is connected to each of the piezoelectric elements 6a, 6b, and 6c.
[0015]
  Each space surrounded by each diaphragm 8a, 8b, 8c and the upper wall of the case 22 is a book.Reference examplePump chambers 28a, 28b, and 28c. And booksReference exampleThe first to third pumps 2A, 2B, 2C are arranged in an arc shape.
  Further, in the case 22, the pump suction ports 14a, 14b, 14c and the pump discharge ports 18a, 18b, 18c of the first to third pumps 2A, 2B, 2C are orthogonal to the diaphragms 8a, 8b, 8c. It opens toward each pump chamber 28a, 28b, 28c.
[0016]
Suction-side check valves 12a, 12b, and 12c (suction-side check valve 12c not shown) are provided at the openings of the respective pump suction ports 14a, 14b, and 14c on the pump chambers 28a, 28b, and 28c side. The discharge side check valves 16a, 16b, 16c (the discharge side check valve 16c is not shown) are also provided in the openings of the pump discharge ports 18a, 18b, 18c on the pump chambers 28a, 28b, 28c side. Is provided.
One suction flow path 24 provided in the case 22 is provided with an external inlet 26 through which a working fluid flows from the outside. The pump inlets 14a, 14b, and 14c of the first to third pumps 2A, 2B, and 2C draw a position that surrounds the external inlet 26 at positions apart from each other, that is, draw a straight line including the external inlet. When the path is divided into two regions, the region communicates with the suction flow path 24 at a position where at least one pump suction port exists in both regions. As shown in FIG. 2, in the present embodiment, the suction flow path 24 is a substantially disk-shaped space provided with a circular inner peripheral wall 24 a in plan view, and an external flow path is formed at the center of the suction flow path 24. An inlet 26 is provided.
[0017]
  Here, the pump inlets 14a, 14b, 14c of the first to third pumps 2A, 2B, 2C are provided in the vicinity of the inner peripheral wall 24a at a substantially equal distance from the center position of the external inlet 26. Further, the pump inlets 14a, 14b, 14c are arranged at an approximately equal distance in the circumferential direction by being arranged at an angle of about 120 ° with the external inlet 26 as a center.
  Then bookReference exampleThe control of the composite pump 20 and the movement of the working fluid existing in the suction flow path 24 will be described with reference to FIGS. 2, 4, 5, and 6.
[0018]
The state in which the driving of the composite pump 20 is stopped is set as an initial state, and from this initial state, the drive control unit 30 performs alternating current in order of the piezoelectric elements 6a, 6b, and 6c at a control timing with a phase difference of 120 degrees. The supply of voltage is started, and as a result, driving of the first pump 2A, then the second pump 2B, and then the third pump 2C starts (the order of driving the clockwise pump in FIG. 2).
When the first pump 2A starts the suction stroke from the initial state, as shown in FIG. 4, in the suction flow path 24, the second pump 2B, the pump suction ports 14b and 14c side of the third pump 2C, and the outside The working fluid on the suction port 26 side flows into the pump suction port 14a.
[0019]
Next, when the first pump 2A has a phase difference of 120 degrees and the suction stroke of the second pump 2B starts, the flow of the working fluid to the pump suction port 14a of the first pump 2A still remains. This makes it difficult for the working fluid to flow from the pump suction port 14a side of the first pump 2A to the pump suction port 14b of the second pump 2B, and relatively from the pump suction port 14c side of the third pump 2C to the second pump 2B. The flow of the working fluid to the pump suction port 14b becomes stronger.
[0020]
Next, when the phase difference of 120 degrees from the second pump 2B and the suction stroke of the third pump 2C starts, the flow of the working fluid to the pump suction port 14b of the second pump 2B still remains. This makes it difficult for the working fluid to flow from the pump suction port 14b side of the second pump 2B to the pump suction port 14c of the third pump 2C, and relatively from the pump suction port 14a side of the first pump 2A to the third pump 2C. The flow of the working fluid to the pump suction port 14c becomes stronger.
[0021]
  In this way, the flow in the suction flow path 24 has directionality, and when the first to third pumps 2A, 2B, and 2C are repeatedly driven, the suction flow as shown by the arrows in FIG. A counterclockwise swirling flow is generated in the path 24.
  This swirl flow has a positive pressure gradient outward in the radial direction so as to balance the centrifugal force applied to the working fluid. So bookReference exampleIf the external inlet 26 is provided at the center of the suction flow path 24 and the suction side check valves 12a, 12b, and 12c are provided in a larger radius area, the upstream pressure of each suction check valve is increased. As a result, the pressure difference between the upstream side and the downstream side of the suction side check valves 12a, 12b, 12c increases.
[0022]
  So bookReference exampleSince the combined pump 20 can increase the suction flow rate and increase the suction / discharge cycle frequency, high output can be realized.
  Further, since it is not necessary to connect a resonance pipe or the like as in the conventional pump in order to achieve high output, the composite pump 20 can be freely changed as well as downsizing. be able to.
  In addition, the pump suction ports 14a, 14b, 14c of the first to third pumps 2A, 2B, 2C are opened to the suction flow path 24 at an equal distance from the center position of the external inlet 26.Reference exampleFor example, as shown in FIG. 7, the composite pump 20 includes a composite pump in which pump suction ports 32a, 32b, and 32c are opened to the suction flow path 24 at different distances from the center position of the external inlet 26, respectively. In comparison, a swirling flow with a higher flow velocity is generated in the suction flow path 24, and the upstream pressure of the suction check valves 12a, 12b, 12c can be further increased. Therefore, the pressure difference between the upstream side and the downstream side of the suction side check valves 12a, 12b, 12c can be further increased, so that the output of the composite pump 20 can be further increased.
[0023]
  Further, the pump suction ports 14a, 14b, 14c of the first to third pumps 2A, 2B, 2C are located at the same angle (120 ° angle) around the external inlet 26 and open to the suction flow path 24. BookReference example8 is compared with a composite pump in which pump suction ports 32a, 32b, and 32c are opened to the suction flow path 24 at different angles from the center of the external inlet 26, as shown in FIG. Thus, a swirling flow having a higher flow velocity is generated in the suction flow path 24, and the upstream pressure of the suction side check valves 12a, 12b, 12c can be further increased. Therefore, the output of the composite pump 20 can be further increased.
[0024]
  In addition, the pump suction ports 14a, 14b, 14c of the first to third pumps 2A, 2B, 2C are opened in the vicinity of the inner peripheral wall 24a of the suction flow path 24.Reference example9, for example, as shown in FIG. 9, the pump suction ports 32 a, 32 b, and 32 c are opened at positions where they are away from the inner peripheral wall 24 a of the suction flow path 24 and closer to the external suction port 26 side. Since the swirling flow has a positive pressure gradient outward in the radial direction as compared with the combined pump, the upstream pressures of the suction side check valves 12a, 12b, and 12c can be further increased. Therefore, it is possible to realize further higher output of the composite pump 20.
[0025]
  Further, a book having a suction passage 24 in a circular space in plan view.Reference exampleFor example, as shown in FIG. 10, the composite pump 20 has a smaller fluid resistance to the swirling flow of the working fluid than the composite pump in which the suction flow path 34 is a substantially triangular space in plan view. A swirl flow with a high flow rate is likely to occur. Therefore, the upstream pressure of the suction side check valves 12a, 12b, and 12c can be further increased, so that the output of the composite pump 20 can be further increased.
[0026]
  Next, FIG.11 and FIG.12 is embodiment which concerns on this invention.1The main part of the composite type pump is shown.
  In the present embodiment, the pump suction ports 36a, 36b, 36c of the first to third pumps 2A, 2B, 2C do not extend in the direction perpendicular to the diaphragms 8a, 8b, 8c, and the first to third pumps 2A, 2B, 2C is formed obliquely in the direction toward the opposite side to the direction of driving order (hereinafter referred to as driving order direction), and each pump chamber 28a of each pump suction port 36a, 36b, 36c. , 28b, 28c side opening 40 is located in front of the suction channel 24 side opening 38 in the direction toward the opposite side.
[0027]
According to the above configuration, when the first to third pumps 2A, 2B, and 2C are driven with a phase difference in order, a swirl flow in the direction of the arrow shown in FIG. 11 (direction opposite to the driving order direction) is sucked. In the suction stroke of each pump, a part of the swirl flow flows toward the opening 38 on the suction flow path 24 side, but the pump suction port is extended in a direction perpendicular to the diaphragm. Since the inflow angle to the pump suction port is smaller and the fluid resistance is smaller than in the case, the pump chambers pass smoothly through the pump suction ports 36a, 36b, 36c from the openings 40 on the pump chambers 28a, 28b, 28c side. Since the gas flows sequentially into 28a, 28b, and 28c, the suction flow rate increases, and the output of the composite pump can be increased.
[0028]
  FIG. 13 also relates to the present invention.Reference example 2The composite pump 50 is shown. In addition,Reference example 1The same components are denoted by the same reference numerals and description thereof is omitted.
  BookReference exampleIn the composite pump 50, three piezoelectric elements 6a, 6b, 6c (the piezoelectric element 6c is not shown) are arranged on the inner peripheral surface 52a of the cylindrical case 52 so as to be substantially equally spaced in the circumferential direction. Diaphragms 8a, 8b, and 8c (diaphragm 8c not shown) are arranged on the inner peripheral side of the piezoelectric elements 6a, 6b, and 6c.
[0029]
Spaces surrounded by the diaphragms 8a, 8b, and 8c and the inner periphery of the case 52 are the pump chambers 54a, 54b, and 54c (the pump chamber 54c is not shown) of the present embodiment. Further, in the case 52, the pump suction ports 14a, 14b, 14c (the pump suction port 14c are not shown) of the first to third pumps 2A, 2B, 2C (the third pump 2C is not shown) and each Pump discharge ports 18a, 18b, 18c (the pump discharge port 18c is not shown) are opened toward the pump chambers 54a, 54b, 54c.
[0030]
Further, in the case 52, an external inflow port 58 through which a working fluid flows from the outside is provided in one suction flow path 56 having a circular shape in plan view provided in a direction orthogonal to the diaphragms 8a, 8b, and 8c. The pump suction ports 14a, 14b, and 14c of the first to third pumps 2A, 2B, and 2C communicate with the inner peripheral surface 56a of the suction flow path 56 at a position that surrounds the external inlet 56 at positions separated from each other. is doing. In this embodiment, an external inflow port 58 is provided at the center of the suction channel 56. Here, the pump suction ports 14 a, 14 b, and 14 c are provided in the case 52 so as to extend in the radial direction centering on the external inflow port 58.
[0031]
When the first to third pumps 2A, 2B, and 2C of the composite pump 50 having the above-described configuration are driven in order, a swirling flow that is reverse to the drive order of the pumps is generated in the suction passage 56.
Since this swirling flow has a positive pressure gradient radially outward so as to balance with the centrifugal force applied to the working fluid, the upstream pressure of the suction side check valves 12a, 12b, 12c increases, The pressure difference between the upstream side and the downstream side of the suction side check valves 12a, 12b, 12c increases.
[0032]
  So bookReference exampleThe combined pump 50 can also increase the suction flow rate and increase the suction / discharge cycle frequency, so that high output can be realized, and a pressure generator, a resonance line, and the like like a conventional pump can be connected. Since it is not necessary, the size can be reduced, and the drive frequency of the pump can be freely changed.
  Furthermore, FIG. 14 is shown in FIG.Reference example 2The modification of is shown.
  BookModified exampleThe pump suction ports 60a, 60b, and 60c of the first to third pumps 2A, 2B, and 2C provided on the inner peripheral surface 56a of the suction flow channel 56 include an opening 62 that opens on the suction flow channel 56 side, An opening 64 that opens on the side of each pump chamber 54a, 54b, 54c is provided, but the opening 62 on the side of the suction flow path 56 is in the drive order direction of the first to third pumps 2A, 2B, 2C. The opening 64 on the side of each pump chamber 54a, 54b, 54c is provided in the rear in the direction toward the opposite side.
[0033]
According to the above configuration, when the first to third pumps 2A, 2B, 2C are driven with a phase difference in order, the arrows in the suction flow path 56 shown in FIG. ) Is generated in the suction flow path 56, and in the suction stroke of each pump, a part of the swirl flow flows toward the opening 62 on the suction flow path 56 side. Since the inflow angle to the pump suction port is smaller and the fluid resistance is smaller than when the pump suction port is extended in the direction, the pump chambers 54a, 54b, 60c pass smoothly through the pump suction ports 60a, 60b, 60c. Since the flow into the pump chambers 54a, 54b, and 54c sequentially from the opening 64 on the 54c side, the suction flow rate increases, and the output of the combined pump can be increased.
[0034]
In each of the above-described embodiments, the composite pump using three pumps 2A, 2B, and 2C has been described. However, the gist of the present invention is not limited to using three pumps, and four or more pumps are used. Even if this pump is used, the same effect can be obtained.
Further, the gist of the present invention is not limited to the check valve, and the same effect can be obtained even if a fluid resistance element such as a fluid diode or a diffuser is used.
[0035]
Furthermore, the gist of the present invention is not limited to the piezoelectric element as a drive source, and the same effect can be obtained even if another actuator such as an electromagnetic motor is used.
[0036]
【The invention's effect】
  As described above, according to the composite pump of the first aspect, when the driving units of at least three or more pumps are driven with a phase difference in order in a certain direction, the certain direction is introduced into the suction flow path. In contrast, a swirling flow in the reverse direction is generated. This swirl flow has a positive pressure gradient outward in the radial direction so as to balance the centrifugal force applied to the working fluid. Accordingly, the pressure on the upstream side of the fluid resistance element provided on the composite pump chamber side of the pump suction port of each pump, that is, the pressure on the suction flow path side rises, and the upstream (suction flow path side) and downstream (pump chamber) of the fluid resistance element. The pressure difference increases. As a result, the suction flow rate is increased and the suction / discharge cycle frequency can be increased, so that a high output of the composite pump can be realized. In addition, in order to increase the output, it is not necessary to connect a pressure generator or a resonant pipe as in a conventional pump. Therefore, it is possible to reduce the size and to change the pump drive frequency freely. It can be a mold pump.In addition, the pump suction port of each pump is formed obliquely toward the direction opposite to the fixed drive direction for driving the drive unit of each pump, and is opened at the composite pump chamber side of the pump suction port. Is located in front of the opening on the suction channel side in the direction toward the opposite side, so that the swirling flow in the direction toward the opposite side is generated in the suction channel. When this occurs, the fluid flows into the composite pump chamber from the opening on the suction flow path side with a small fluid resistance, so that the suction flow rate increases and the output of the composite pump can be increased.
[0037]
According to the second aspect of the present invention, the position where the pump suction port of each pump is connected to the suction flow path is set at a substantially equidistant position centering on the position where the external inlet is connected. A swirling flow having a higher flow velocity is generated in the suction flow path, and the pressure upstream (suction flow path side) of the fluid resistance element can be further increased. Therefore, since the pressure difference between the upstream and downstream of the fluid resistance element can be further increased, the output of the composite pump can be further increased.
[0038]
According to the third aspect of the present invention, the position where the pump suction port of each pump is connected to the suction flow path is approximately on the circumference of a predetermined radius centered on the position where the external inlet is connected. By setting the positions at equal intervals, a swirling flow having a higher flow velocity is generated in the suction flow path, and the output of the composite pump can be further increased.
According to the invention described in claim 4, the external inlet is connected to the substantially central position of the suction flow path, and the position where the pump suction port of each pump is connected to the suction flow path is separated from the external flow inlet. Since the swirl flow has a positive pressure gradient outward in the radial direction, the pressure upstream of the fluid resistance element (suction channel side) can be further increased. In addition, higher output of the composite pump can be realized.
[0039]
  According to the fifth, sixth, and seventh aspects of the invention, since the suction flow path is formed as a substantially disk-shaped space, the fluid resistance to the swirling flow of the working fluid is reduced, and a swirling flow having a high flow velocity is generated. Therefore, the pressure upstream of the fluid resistance element (on the suction flow path side) can be further increased, and the output of the composite pump can be increased..
[Brief description of the drawings]
FIG. 1 is a longitudinal section showing a structure of a general pump using a piezoelectric element as an actuator.
FIG. 2 relates to the present invention.Reference example 1It is the figure which showed typically the complex type pump by planar view.
FIG. 3 is a view taken along the line III-III in FIG. 2;
[Fig. 4]Reference example 1It is a schematic diagram which shows the state which driven the 1st pump of this composite type pump.
[Figure 5]Reference example 1It is a schematic diagram which shows the state which gave the phase difference of 120 degrees from the 1st pump of this composite type pump, and the 2nd pump was driven.
[Fig. 6]Reference example 1It is a schematic diagram which shows the state which gave the phase difference of 120 degrees from the 1st pump of this composite pump, and the 2nd pump, and the 3rd pump was driven.
[Fig. 7]Reference example 1It is a schematic diagram which shows the 1st example in which a structure differs from this composite pump.
[Fig. 8]Reference example 1It is a schematic diagram which shows the 2nd example in which a structure differs from this complex type pump.
FIG. 9Reference example 1It is a schematic diagram which shows the 3rd example in which a structure differs from this complex type pump.
FIG. 10Reference example 1It is a schematic diagram which shows the 4th example in which a structure differs from this composite pump.
FIG. 11 is a diagram according to the present invention1It is a figure which shows the principal part of the composite pump of embodiment.
FIG. 121It is a figure which shows the generation | occurrence | production state of the swirl | vortex flow in the composite pump of embodiment.
FIG. 13 is related to the present invention.Reference example 2It is a figure which shows the principal part of this type | mold composite pump.
FIG. 14 is related to the present invention.Modification of Reference Example 2It is a figure which shows the principal part of this type | mold composite pump.

Claims (7)

A drive unit for reciprocating a movable wall such as a piston or a diaphragm, a pump chamber whose volume can be changed by the reciprocating motion of the movable wall, a pump inlet through which a working fluid flows into the pump chamber, and a pump chamber A composite pump comprising at least three or more pumps each including a pump discharge port through which a working fluid flows out and a fluid resistance element provided at the pump suction port;
An external inflow port through which a working fluid flows from the outside is connected to the suction flow path, and the pump suction ports of each pump are connected to the external flow path at positions separated from each other in the suction flow path. Connect to the position that surrounds the inlet, and drive the drive part of each pump with phase difference in order in a certain direction ,
The pump suction port of each pump is formed obliquely toward the direction opposite to the fixed drive direction for driving the drive unit of each pump, and is opened at the composite pump chamber side of these pump suction ports. opening and is, than the opening which is open in the suction flow path, a composite pump characterized that you have positioned in front of the direction toward the opposite side. Composite of the position in which the pump suction port of each pump is connected to the suction passage, according to claim 1, wherein the external inlet is located an equal distance around a position connected Type pump. Wherein said that pump suction port of each pump is located that is connected to the suction passage, the position of equal interval on the circumference of a predetermined radius around the position in which the external flow inlet is connected The composite pump according to claim 1 or 2. As well as connecting the external inlet to central position in said suction passage, the position in which the pump suction port of each pump is connected to the suction flow path, of the external flow the suction passage away from the entrance The composite pump according to any one of claims 1 to 3, wherein the combined pump is an edge. Composite pump according to any one of claims 1 to 4, characterized in that the formation of the suction passage as a space circular plate shape.   The external inflow port is connected to one of a pair of opposed walls facing each other inside the suction flow path, and a pump suction port of each pump is connected to the other of the pair of opposed walls. 5. The combined pump according to 5.   The external inflow port is connected to one of a pair of opposed walls facing each other inside the suction flow path, and a pump suction port of each pump is connected to a peripheral wall provided between the pair of opposed walls. The composite pump according to claim 5.

Images