JP2008014205A - Control method of pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device of a pump device capable of rapidly closing an opening and closing valve of a positive displacement pump, and simultaneously, capable of reducing the noise by restraining the impact noise in closing. <P>SOLUTION: In the pump device 10, a driving current Id is supplied to a driving coil 26, and a driving part M is driven, and the positive displacement pump repeats introduction and delivery of fluid by varying the volume of first and second pump chambers 30a and 30b. The driving current Id supplied to the driving coil 26 is maintained constant at an intermediate value I2 for a prescribed time Δt just before closing the valve after starting closing operation of the valve, and a closing speed just before closing of the valve is lowered, and the valve is gently closed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control method for a pump device, and more particularly, a pump having an electromagnetic positive displacement pump in which suction of fluid into a pump chamber and discharge operation of fluid from the pump chamber are repeated by displacement of a drive unit by electromagnetic drive. In particular, the present invention relates to a method for controlling the opening / closing operation of a passive check valve provided in a suction channel or a discharge channel of the fluid.

  In recent years, for example, a liquid cooling type cooling system using a liquid refrigerant for cooling a semiconductor integrated circuit element provided in an electronic device such as a personal computer or a server, particularly a CPU (Central Processing Unit) has been proposed. For such a cooling system, for example, a positive displacement pump capable of discharging liquid at a high pressure even with a small size as shown in Patent Document 1 is preferably used.

  For example, in the pump device described in Patent Document 2, a movable body, which is a drive magnet, is disposed so as to be slidable in the axial direction of the cylinder, and a drive coil is disposed on the outer peripheral side of the cylinder. The pump device is controlled by the amount and direction of current. In this pump device, the check valve is formed so that the flow passage cross-sectional area of the smallest gap portion between the valve body and the valve seat becomes the smallest flow passage cross-sectional area at the position where the valve body is most open. . As a result, the gap between the valve body and the valve seat is reduced to shorten the time when the fluid flows backward, the impact action due to the fluid is reduced, or the drive voltage when the drive magnet, which is a movable body, is reversed. Alternatively, the noise is suppressed by adjusting the driving current to reduce the moving driving force to mitigate the impact action by the fluid.

JP 2006-25546 A JP 2005-315093 A

  However, as in the pump device of Patent Document 2, noise may be reduced by reducing the clearance between the valve body and the valve seat or by reducing the propulsive force related to the valve body. There is a problem that the flow rate of the fluid in the state where the valve is opened is small because the flow path of the valve is narrow, and the responsiveness in the opening and closing operation of the valve is deteriorated.

  Moreover, in the pump apparatus of patent document 2, since it is comprised so that a drive magnet may slide inside a cylinder as a movable body, the mass of a movable body will be large and the inertia concerning a movable body will become large. Therefore, when trying to control the movement of the movable body by suppressing the thrust acting on the movable body, the time for reducing the drive current or drive voltage or drive current becomes longer, and the operating efficiency of the pump device becomes worse, There has been a problem that the opening / closing operation of the valve becomes slow, and the responsiveness of the pump device deteriorates. Therefore, it has been difficult to reduce the noise while maintaining the operation efficiency and responsiveness of the pump device.

  The problem to be solved by the present invention is that the opening and closing operation of the passive valve interposed in the passage between the pump chamber of the positive displacement pump and the fluid inlet or outlet is quickly performed. The present invention provides a control method of a pump device that reduces noise such as an impact sound with a valve seat when the valve is closed, thereby improving the operating performance and noise environment of such a positive displacement pump device. It is intended.

  In order to solve the above-described problems, a control method for a pump device according to the present invention includes an inflow port for sucking fluid and a fluid that is connected to the inflow port and sucked from the inflow port. In a control method of a pump device having a reservoir for storing the fluid, a discharge port for discharging the fluid stored in the reservoir, and a volumetric pump for changing the volume of the reservoir, the volume pump is driven by a driving means. A drive unit that is driven to change the volume of the reservoir, and the drive unit includes a drive coil as the drive unit, and the drive current supplied to the drive coil is supplied to the inlet and the discharger. A drive current energized to the drive coil after a valve that opens and closes the flow path between the inlet or the discharge port and the reservoir disposed between the outlet and the reservoir starts a closing operation. In the first half and the second half Closing operation of the valve by being energized so that it is an gist to be slowly carried out.

  Here, the drive current energized to the drive coil is energized differently in the first half and the second half by maintaining the current value for a predetermined time in the second half as described in claim 2, and the valve closing operation It is desirable that this is performed slowly.

  Further, the drive current energized to the drive coil is energized so as to lower the closing speed immediately before closing as compared with the closing speed in the first half when the valve starts closing operation as described in claim 3. Thus, the valve closing operation may be performed slowly.

  According to another aspect of the present invention, there is provided a control method for a pump device for storing an inflow port for sucking fluid and a fluid connected to the inflow port and sucked from the inflow port. In the control method of a pump device having a reservoir portion, a discharge port for discharging the fluid accumulated in the reservoir portion, and a volumetric pump for changing the volume of the reservoir portion, the volume pump is driven by a driving means and is A drive unit that changes the volume of the reservoir and a fixed unit that supports the drive unit in a drivable manner; the drive unit includes one of a drive magnet and a drive coil; One of the drive magnet and the drive coil is provided, and the drive unit is configured to be movable by the mutual magnetic attraction force or magnetic repulsion force of the drive magnet and the drive coil. The drive current supplied to the drive coil is closed by a valve that opens and closes the flow path between the inlet or the outlet and the reservoir disposed between the inlet and the outlet and the reservoir. After starting the operation, the current value of the drive current energized to the drive coil in the second half is maintained for a predetermined time, and the valve is closed gradually by energizing it differently from the first half. To do.

  According to another aspect of the present invention, there is provided a control method for a pump device, wherein an inlet that sucks fluid and a fluid that is connected to the inlet and sucked from the inlet are stored. In a control method of a pump device having a reservoir portion for discharging, a discharge port for discharging the fluid stored in the reservoir portion, and a volumetric pump for changing the volume of the reservoir portion, the inflow port, the discharge port, and the A valve that opens and closes the flow path between the inflow port or the discharge port and the reservoir and is biased in the closing direction between the reservoir and the reservoir is further driven by a driving means to increase the volume of the reservoir. The drive unit of the positive displacement pump to be changed is provided with either a drive magnet or a drive coil, and the fixed unit that supports the drive unit in a drivable manner is either the drive magnet or the drive coil. And the drive magnet and the drive coil are configured such that the drive unit can be moved by the mutual magnetic attraction force or magnetic repulsion force of the drive magnet, and the drive coil is energized after the valve starts closing operation. The gist of the invention is that the valve is closed gradually when the current is applied differently between the first half and the second half.

  According to the control method of the pump device according to claim 1 of the present invention, the drive unit is driven by energization of the drive current to the drive coil, the volume of the reservoir changes, and the fluid in the reservoir is discharged from the discharge port. At the same time, fluid is sucked into the reservoir from the inlet, and at that time, the valve provided between the reservoir and the inlet and the valve provided between the outlet and the discharge port are opened and closed. When the valve is opened and closed, the drive current applied to the drive coil is energized so that it differs between the first half and the second half after the valve starts to close. Since it is performed, the impact sound at the time of valve closing is reduced, and the noise accompanying the impact sound can be suppressed.

  Further, if the drive coil is provided on the drive unit side, the mass of the drive unit can be reduced compared with the structure in which the drive magnet is provided on the drive unit side, and the inertial force related to the drive unit can be reduced. Can do. Therefore, when the valve is closed, the drive current to the drive coil is quickly reduced, and the decrease in the drive current to the drive coil is relaxed immediately before the valve is closed, so that the valve is closed slowly. The accompanying operation time is short, and the operation efficiency as the pump device is high and the responsiveness is ensured.

  At this time, if the current value of the drive current supplied to the drive coil is maintained for a predetermined time in the second half of the valve closing operation, the kinetic energy (acting on the drive coil during that time) (Inertial energy) is absorbed, and the momentum of closing the valve is lost, so that the valve closing operation is performed slowly, and noise such as impact noise accompanying the valve closing operation is effectively reduced. It becomes.

  In addition, as described in claim 3, when the closing speed immediately before closing is lowered compared to the closing speed in the first half when the closing operation of the valve is started, the operation time associated with the closing operation of the valve may become longer. In addition, the impact sound of the valve is also suppressed, and the generation of noise can be effectively suppressed.

  On the other hand, according to the control method of the pump device according to claim 4 of the present invention, the same effect can be obtained even if either the drive coil or the drive magnet of the positive displacement pump is used as the drive unit or the fixed unit. Relative displacement is caused by the magnetic attractive force or magnetic repulsive force between the coil and the drive magnet, and the valve between the inlet and the outlet and the valve between the inlet and the outlet are opened and closed by the change in the volume of the reservoir due to this displacement. Is discharged and sucked into the reservoir. During the valve opening / closing operation, the current value of the drive current supplied to the drive coil is maintained constant for a predetermined time in the second half of the valve closing operation, and is supplied differently from the first half of the valve closing operation. By causing the valve closing operation to be performed slowly, the impact sound when the valve is closed can be reduced, and noise associated with the impact sound can be suppressed.

  Also in this case, the embodiment and effects described in claims 2 and 3 can be shared.

  Further, in the control method of the pump device according to claim 5 of the present invention, as in the case of claim 4, either of the drive coil or the drive magnet is used as the drive unit, and the same effect can be obtained as the fixed unit. With relative displacement due to the magnetic attractive force or magnetic repulsive force between the drive coil and the drive magnet, the valve is opened and closed between the inlet and the outlet by the change in the volume of the reservoir. However, the valve interposed in the flow path between the reservoir and the inflow port and the discharge port is urged in the closing direction of the flow path. Therefore, when the drive current supplied to the drive coil is energized so that it differs between the first half and the second half of the valve closing operation, the drive current is rapidly changed in the first half of the valve closing operation, and Since the valve body is biased in the direction of closing the valve, the valve can be quickly closed. On the other hand, in the second half of the valve closing operation, the change in the driving current is different from that in the first half, and the driving current is gradually changed, so that the valve closing operation is performed gently. Thereby, generation | occurrence | production of the noise at the time of the valve body of a valve colliding with a valve seat can be suppressed, and the noise at the time of operation | movement of a pump apparatus can be reduced.

  Also in this case, the embodiment and effects described in claims 2 and 3 can be shared.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1A and 1B show a schematic configuration of a pump device according to an embodiment of the present invention. FIG. 1A is a plan view, FIG. 1B is a cross-sectional view taken along line AA, and FIG. FIG. 2 and 3 are exploded perspective views of the pump device.

  As shown in these drawings, the pump device 10 has a cover plate 16 on a flange portion 14 formed on the outer peripheral edge of the case body 12 having a relatively shallow casing shape with one surface opened. It is assembled integrally with screws 18 or the like.

  In the case body 12, a pair of drive magnets (permanent magnets) 22a and 22b having the same diameter are provided so that the same poles face each other with the disc-shaped inner yoke 20 interposed therebetween. A drive coil 26 wound around a coil bobbin 24 so as to surround the outer peripheral surfaces of 22a and 22b is slidably disposed on the inner yoke 20 and the outer peripheral surfaces of the drive magnets 22a and 22b.

Further, an outer yoke is provided so as to cover the end surfaces of the drive magnets 22a and 22b on the side not in contact with the inner yoke 20 and to surround the outer peripheral surface of the ring member 27 so as to face the outer peripheral surfaces of the drive magnets 22a and 22b. 28 is disposed. Therefore, in this embodiment, the drive coil 26 wound around the coil bobbin 24 forms the drive portion M, and the inner yoke 20, the drive magnets 22a and 22b, and the outer yoke 28 form the fixed portion S.

  As a result, in the sliding space of the drive coil 26 surrounded by the outer yoke 28 in the case main body 12, the first pump chamber 30 a formed on the inner bottom surface side of the case main body 12 and the lid plate 16 side. A fluid reservoir 30 is formed which is partitioned into a second pump chamber 30b to be formed.

  Then, on the outer wall surface of the case body 12, the inflow conduit 32 that flows the fluid into the first pump chamber 30 a and the second pump chamber 30 b of the reservoir 30 and the fluid that flows into the reservoir 30 are discharged. A discharge pipe 34, a fluid inlet 32 a provided in the inflow pipe 32, a discharge port 34 a provided in the discharge pipe 34, and the first pump chamber 30 a and the second pump of the reservoir 30. Inflow passages 36a and 36b and discharge valves 38a and 38b for opening and closing the passage are provided in the fluid passage between the chamber 30b and the fluid passage.

  That is, the partition wall 40 that partitions the fluid channel on the inlet 32a side and the fluid channel on the discharge port 34a side in a space region between the inner wall surface of the case body 12 and the outer peripheral surface of the outer yoke 28, and And partition walls 42a, 42b, 44a, 44b for partitioning the fluid channel on the inlet 32a side and the fluid channel on the outlet side 34a between the first pump chamber 30a and the second pump chamber 30b, respectively. A partition wall member 46 is provided to partition the fluid so as not to flow between the first pump chamber 30a and the second pump chamber 30b.

The inlet valves 36a and 36b are opened and closed in communication holes formed in the partition walls 42a and 42b that partition the inlet 32a from the first pump chamber 30a and the second pump chamber 30b. At the same time, the discharge valves 38a and 38b can be freely opened and closed in communication holes formed in the partition walls 44a and 44b that partition the fluid discharge port 34a from the first pump chamber 30a and the second pump chamber 30b. It is arranged.

  These inflow valves 36a, 36b and discharge valves 38a, 38b are all constituted by passive check valves, which open and close in response to the pressure difference between the two chambers (the upstream side and the downstream side of the valve). When the other valve is closed, the other valve is opened, and the closing valve collides with the valve seat, and the collision noise is generally generated as noise.

  FIG. 4 shows a schematic configuration of the inflow valves 36a and 36b and the discharge valves 38a and 38b. These valves all have the same configuration, and only one valve will be described. In each of these valves, elastic bases 54a and 54b extend in the opposite directions to the base of the valve shaft 52. Receiving portions 56a, 56b that are received on the back side (upstream side in the fluid flow direction) of the valve seats 48a, 48b, 50a, 50b of the partition wall member 46 are provided at the distal ends of the arm portions 54a, 54b. On the other hand, a valve body having a semicircular arc-shaped curved surface in close contact with the opening edge on the surface side (downstream side in the fluid flow direction) of each valve seat 48a, 48b, 50a, 50b at the tip of the valve shaft 52. 58 is attached to the valve shaft 52 so as not to be removable.

  These valves are constructed by assembling the valve body 58 and the valve shaft 52 provided with arm portions 54a and 54b provided with receiving portions 56 at both ends, which are separately formed of a synthetic resin material or the like. Is done. Here, the valve shaft 52 including the arm portion 54 provided with the receiving portion 56 is made of, for example, silicon rubber, and elasticity is imparted to the arm portions 54a and 54b. The valve body 58 is also formed of a flexible synthetic resin material.

  The outer yoke 28 has a communication port 60a for communicating the first pump chamber 30a and the inflow port 32a, a notch port 60b for communicating the second pump chamber 30b and the inflow port 32a, and a second port. A communication port 62a that communicates between one pump chamber 30a and the discharge port 34a and a notch port 62b that communicates between the second pump chamber 30b and the discharge port 34a are established. A fluid flow path between the pump chamber 30a and the second pump chamber 30b and a fluid flow path between the discharge port 34a and the first pump chamber 30a and the second pump chamber 30b are secured.

  Further, as shown in FIGS. 2 and 3, the outer surface of the case body 12 has a microcomputer with a controller and a memory incorporated therein for controlling the pump device 10 and power to the drive coil 26 in cooperation with the microcomputer. A control board 64 on which a driver circuit to be supplied and the like is mounted is attached to the case body 12 by, for example, screwing into the screw holes 65 and 65. The driver circuit output terminals 66a and 66b provided on the control board 64 are connected to the electric wire terminal of the drive coil 26 through a flexible power supply member or the like (not shown), and are electromagnetic. Electric power for driving the actuator is supplied to the drive coil 26.

  In the pump device 10 configured as described above, when a current in one direction is passed through the drive coil 26, a Lorentz force that is superimposed on the radial magnetic field is generated in the drive coil 26, and a piston (in this embodiment, the drive unit M) is generated. ) In one direction. As a result, the volume of each pump chamber decreases on the one hand and increases on the other hand. Then, the pressure in the pump chamber with the reduced volume increases, the valve on the discharge side opens and the fluid flows out, and the pressure in the pump chamber with the increased volume decreases and the valve on the suction side opens and the fluid flows in. .

  When the amount of current is reduced after the predetermined time has elapsed, the displacement of the piston (drive unit M) is reduced, so that the pressure at which fluid is discharged from one pump chamber and sucked into the other pump chamber is small. Become. When the pressure for sucking and discharging the fluid in each pump chamber is smaller than the pressure of the fluid on the inlet 32a side and the outlet 34a side, the valve on the side that has been opened is closed. Then, when the drive current is reversed after reaching 0 (zero), the valve on the closed side before the reverse starts to open.

  This will be described in more detail. For example, when a current is passed from the neutral state of FIG. 5A to the drive coil 26 and the drive coil 26 is moved in the direction of the arrow a as shown in FIG. The volume of the first pump chamber 30a decreases and the volume of the second pump chamber 30b increases. Therefore, the pressure of the first pump chamber 30a having a reduced volume increases, and the inflow valve 36a provided in the fluid flow path between the first pump chamber 30a and the inflow port 32a remains closed. The discharge valve 38a provided in the fluid flow path between the pump chamber 30a and the discharge port 34a is opened, and the fluid in the first pump chamber 30a flows out from the discharge port 34a through the discharge valve 38a. On the other hand, the pressure of the second pump chamber 30b with the increased volume decreases, and the discharge valve 38b provided in the flow path between the second pump chamber 30b and the discharge port 34a remains closed, The inflow valve 36b provided in the flow path between the pump chamber 30b and the inflow port 32a is opened, and fluid flows into the second pump chamber 30b from the inflow port 32a through the inflow valve 36b. .

  When the energization amount to the drive coil 26 starts to decrease after a predetermined period, the pressure for discharging the fluid from the first pump chamber 30a decreases and the pressure for sucking the fluid into the second pump chamber 30b also decreases. To go. When the fluid pressure on the inlet 32a side and the discharge port 34a side becomes larger, the inflow valve 36b in the second pump chamber 30b is closed, and the discharge valve 38a in the first pump chamber 30a is also closed.

  Then, when a current in the opposite direction is supplied to the drive coil 26 and the drive coil 26 is moved in the direction indicated by the arrow b as shown in FIG. 5C, the volume of the second pump chamber 30b is reduced. The volume of the first pump chamber 30a increases. Therefore, the pressure of the second pump chamber 30b having a reduced volume increases, and the inflow valve 36b provided in the flow path between the second pump chamber 30b and the inflow port 32a remains closed, and the second pump chamber 30b is closed. The discharge valve 38b provided in the flow path between the pump chamber 30b and the discharge port 34a is opened, and the fluid in the second pump chamber 30b flows out from the discharge port 34a through the discharge valve 38b, and the other The pressure of the first pump chamber 30a having an increased volume decreases, and the discharge valve 34a provided in the flow path between the first pump chamber 30a and the discharge port 34a remains closed. The inflow valve 36a provided in the flow path between the pump chamber 30a and the inflow port 32a is opened, and fluid flows into the first pump chamber 30a from the inflow port 32a through the inflow valve 36a. It becomes.

  FIG. 6 shows the opening / closing operation state of the inflow valves 36a and 36b or the discharge valves 38a and 38b at this time, but in the state where no fluid flows as shown in FIG. Although the body 58 is in close contact with the valve seats 48 and 50 and the flow path is closed, when the fluid flows as shown in FIG. 6B, the valve body 58 is removed from the valve seats 48 and 50 by the pressure of the fluid. When the fluid pressure is reduced, the valve body 58 is returned to the original position by the deformation restoring force of the arm portions 54a and 54b of the valve shaft 52, and the flow path is closed. is there.

  At this time, for example, as is generally performed, when the valves 36a and 36b are vigorously closed from the state shown in FIG. 6B to the state shown in FIG. 6A, the arm portions 54a and 54b are shown in FIG. Since it is greatly deformed, its deformation restoring force is very large, and the valve body 58 collides with the valve seats 48 and 50 vigorously and generates a large noise.

  On the other hand, if the pressure change of the fluid is once reduced from the state of FIG. 6 (b) to the state immediately before the valve body 58 contacts the valve seats 48 and 50 as shown in FIG. 6 (c). The deformation restoring force of the arm portions 54a and 54b is weakened, the valve body 58 gently contacts the valve seats 48 and 50, and noise at the time of closing the valve is reduced.

  In order to realize such valve closing operation, the present invention opens and closes these valves by controlling the current flowing through the drive coil 26 during the opening and closing operations of the inflow valves 36a and 36b and the discharge valves 38a and 38b. It controls the operation.

  FIG. 7 shows the amount of drive current applied to the drive coil 26.

  The drive current Id supplied to the drive coil 26 is controlled as follows. That is, a current waveform pattern to be applied to the drive coil 26 is stored in a memory built in the microcomputer mounted on the control board 64 attached to the outside of the case body 12 of the pump device 10, and is built in the microcomputer. The controller circuit controls the driver circuit based on the current waveform pattern, and a necessary current is output from the driver circuit to the drive coil 26.

  The pump device 10 is controlled by PWM (Pulse Width Modulation) control, and a pulse current is output from the driver circuit, but the driving coil 26 has a high-frequency pulse waveform output from the driver circuit due to its reactance. The component is attenuated, and a drive current Id having a waveform in which the vertices of successive pulses are connected flows.

  Therefore, returning to FIG. 7, when the energization amount is gradually increased from the state where the energization amount to the drive coil 26 is zero (0), the drive current waveform gradually rises with a sine curve to the plus side, and the time The predetermined drive current value I1 is reached at t1, and the current value I1 is maintained for a period up to time t2. At this time, the driving unit M including the driving coil 26 of the pump device 10 is generated by the magnetic field generated by the fixed unit S including the inner yoke 20 and the driving magnets 22a and 22b and the driving current Id supplied to the driving coil 26. It moves in the direction shown by arrow F1 by the attractive force and repulsive force of the magnetic field. Then, the volume of the first pump chamber 30a increases, the fluid pressure in the first pump chamber 30a decreases, and the inflow valve on the first pump chamber 30a side due to the pressure of the fluid flowing in from the inflow port 32a. 36a opens, and the fluid flows into the first pump chamber 30a.

  After that, the driving current starts to decrease from time t2, and the driving current Id reaches 0 and moves to the minus side until time T / 2. When the drive current Id decreases, the change in the drive current differs between the first half and the latter half of the time from the predetermined drive current value I1 to 0.

  That is, in the first half when the drive current starts to decrease, the drive current Id is rapidly decreased substantially linearly. During the time from t2 to T / 2, the drive unit M of the pump device 10 moves in the direction indicated by the arrow F1 while being decelerated from the moving speed up to time t2. Then, the difference between the fluid pressure in the first pump chamber 30a and the fluid pressure on the inlet 32a side is reduced, the force acting in the valve opening direction is weakened, and the inflow valve on the first pump chamber 30a side is closed. start.

  In the second half of the decrease state of the drive current Id, the drive current Id is kept constant for a predetermined period Δt at a current value I2 between the predetermined drive currents I1 and 0, and the first half of the decrease state of the drive current Id. Energize differently. During the period Δt in which the intermediate value I2 is maintained, the speed at which the drive unit M moves in the direction indicated by the arrow F1 is further slower than the first half of the lowering state of the drive current Id, and the first pump chamber 30a The change in volume is reduced, the momentum of closing the valve is weakened, the kinetic energy applied to the valve body is reduced, and the speed of the closing operation of the valve becomes very slow.

  Thereafter, the drive current Id linearly changes again from the intermediate value I2 to 0. At this time, the drive part M will be in the state which moved to the inner bottom part of the case main body 12, and the valve | bulb 36a for inflow of the 1st pump chamber 30a will be in the closed state. Thus, when the valve body of the inflow valve 36a of the first pump chamber 30a is seated on the valve seat, the kinetic energy applied in the direction in which the valve body approaches the valve seat is suppressed in the second half of the valve closing operation. Thus, since the momentum for closing the valve is weakened, the valve body is gently seated on the valve seat, and the impact sound during the seating is suppressed.

  In the period from T / 2 to T, the drive current Id is supplied to the drive coil 24 in the opposite direction, and the drive unit M moves in the direction opposite to the direction indicated by the arrow F1. Therefore, the inflow valve 36b in the second pump chamber 30b is opened and closed in the same manner as the inflow valve 36a in the first pump chamber 30a. At this time, the inflow valve 36a of the first pump chamber 30a remains closed. Further, in the waveform of the drive current Id shown in FIG. 7, the current value I2 at which the drive current Id is kept constant during the descending state is about 15% of the peak drive current value I1.

  Next, the operation of the pump device 10 when the drive current Id shown in FIG. 7 is applied to the drive coil 26 of the pump device 10 is not limited to the operation of the inflow valves 36a and 36b described above, but the discharge valves 38a and 38b. The operation will be described with reference to FIGS. 8A to 8H. First, at time t0, the drive unit M is disposed at an arbitrary position, for example, at the uppermost position of the fixed unit S as shown in FIGS. 8A and 8B, and the first and second pump chambers 30a. , 32a, the inflow valves 36a, 36b and the discharge valves 38a, 38b are all closed. When the drive current Id starts to rise, the drive unit M starts to move in the direction indicated by the arrow F1. Then, the volume of the first pump chamber 30a begins to increase, and the pressure of the fluid on the first pump chamber 30a side decreases. As a result, the discharge valve 38a of the first pump chamber 30a remains closed so as to prevent the backflow of fluid from the first pump chamber 30a to the discharge port 34a, and the inflow valve 36a The valve portion begins to move and move away from the valve seat against the urging by the arm portion, and fluid starts to be introduced into the first pump chamber 30a via the inlet 32a.

  On the other hand, the volume of the second pump chamber 30b starts to decrease, and the pressure of the fluid on the second pump chamber 30b side increases, so that the inflow valve 36b has a fluid flow from the second pump chamber 30b to the inlet 32a side. The discharge valve 38b on the second pump chamber 30b side starts to open while being closed so as to prevent backflow, and the fluid stored in the second pump chamber 30b is discharged through the discharge port 34a.

  Then, while the drive current Id reaches the current value I1, and the current value I1 is maintained, the drive unit M continues to move in the direction indicated by the arrow F1 at a substantially constant speed (see FIGS. 8C and 8D). ). The inflow valve 36a of the first pump chamber 30a is kept open, the discharge valve 38a is kept closed, the inflow valve 36b of the second pump chamber 30b is closed, and the discharge valve 38b is open. To be kept. Thereby, the fluid is introduced into the first pump chamber 30a, and the fluid continues to be discharged from the second pump chamber 30b. Then, when this current value I1 is maintained for a period until time t2, the drive current Id starts to decrease.

  When the drive current Id starts to decrease, the speed at which the drive unit M moves in the direction indicated by the arrow F1 starts to decrease. Then, the increase in the volume of the first pump chamber 30a is moderated, the pressure difference between the fluid on the first pump chamber 30a side and the inlet side is reduced, and the momentum of the fluid flowing into the first pump chamber 30a is increased. become weak. On the other hand, the volume decrease on the second pump chamber 30b side also becomes moderate, the pressure difference between the fluid on the second pump chamber 32b side and the discharge port 34a side becomes small, and the fluid discharged from the second pump chamber 30b Will lose momentum. As a result, the inflow valve 36a on the first pump chamber 30a side begins to close, and the discharge valve 38b in the second pump chamber 30b also begins to close. The discharge valve 38a on the first pump chamber 30a side and the inflow valve 36b on the second pump chamber 30b remain closed.

  Here, immediately before the inflow valve 36a of the first pump chamber 30a and the discharge valve 38b of the second pump chamber 30b are completely closed, the drive current Id is maintained at a predetermined intermediate value I2 for a predetermined period Δt. As a result, the moving speed in the direction indicated by the arrow F1 acting on the drive unit M becomes slow, and the change in the volume of the first pump chamber 30a becomes small. Then, the closing speed of these valves 36a and 38b becomes slower than the first half of the closing operation of the valve, the momentum for closing the valve is weakened, and the kinetic energy applied to the valve body of the valve is reduced.

  Thereafter, the drive current Id decreases linearly from the intermediate value I2 to 0. Then, when the drive unit M further moves in the direction of the arrow F1 and is lowered to the lowest position of the drive magnet 22b, the fluctuations in the volumes of the first pump chamber 30a and the second pump chamber 30b stop, and the first pump Since the pressure difference between the chamber 30a and the inlet 32a is reduced and the pressure difference between the second pump chamber 30b and the discharge port 34a is reduced, the inflow valve 36a and the second pump chamber in the first pump chamber 30a are reduced. The discharge valve 38b of 30b is closed. In the second half of the closing operation of the inflow valve 36a of the first pump chamber 30a and the discharge valve 38b of the second pump chamber 30b as in the control method according to this embodiment, the drive current Id is changed to the intermediate value I2. When the drive coil 26 is energized so as to maintain Δt for a predetermined period of time, when the valve portion collides with the valve seat, the kinetic energy in the direction in which the valve portion approaches the valve seat is suppressed, and the valve is gently closed. can do. Thus, by controlling the pump device 1 so as to keep the kinetic energy of the valve body when the valve portion is seated on the valve seat low, noise when the valve is closed can be reduced.

  When the drive current is reversed to the minus side (for example, the time from T / 2 to T), the drive current Id in the reverse direction flows through the drive coil 26, and the drive unit M is opposite to the direction indicated by the arrow F1. The volume of the first pump chamber 30a decreases and the volume of the second pump chamber 30b increases. Then, the discharge valve 38a of the first pump chamber 30a is opened, and the fluid stored in the first pump chamber 30a is discharged. On the other hand, in the second pump chamber 30b, the inflow valve 36b is opened, and fluid is introduced from the inlet 32a side into the second pump chamber 30b. The change in the drive current Id at this time varies in the same manner as described above only in the direction of flow, and the movement of the drive unit M and the discharge valve 38a in the first pump chamber 30a associated therewith. And the operation of the inflow valve 36b of the second pump chamber 30b also operates in the same manner as described above, and when the valve is closed, the kinetic energy at which the valve portion collides with the valve seat is suppressed, The valve can be closed gently.

  Then, by repeating this series of operations, fluid flows into and out of the first pump chamber 30a and the second pump chamber 30b of the pump device 10 of the present invention. At this time, the noise of the pump device 10 is reduced because the collision noise generated when the valve body of the valve stops against the valve seat is suppressed.

  If the drive current Id is supplied to the drive coil 26 in this way, the drive unit M is driven vigorously in the first half of the valve closing operation, and the valve body is closed by the urging force of the arm portion of the valve shaft. Coupled with being biased in the direction, it is possible to close the valve vigorously. The driving current is maintained at the intermediate value I2 for a predetermined period Δt in the latter half of the closing operation of the valve, particularly immediately before the valve is closed against the valve seat and the valve is closed, and the momentum for closing the valve is weakened. Therefore, the valve can be closed gently. As described above, the valve is quickly closed in the first half of the valve closing operation, and is gently closed in the second half, so that the valve closing operation is performed quickly, and noise at the time of valve closing is reduced. Performance can be improved.

  According to such a control method, when the inflow valves 36a and 36b and the discharge valves 38a and 38b provided in the pump device 10 are closed, the drive current Id supplied to the drive coil 26 is used for inflow. By energizing the valves 36a, 36b or the discharge valves 38a, 38b to be different in the first half and the latter half, the inflow valves 36a, 36b and the discharge valves 38a, 38b are gradually closed. The impact sound when the inflow valves 36a and 36b and the discharge valves 38a and 38b are closed is reduced, and noise associated with the impact sounds is suppressed.

Further, if the drive coil 26 is provided on the drive unit M side, the mass of the drive unit M can be reduced as compared with the structure in which the drive magnet is provided on the drive unit M side, and the inertia of the drive unit M can be reduced. The power can be reduced. Therefore, when the inflow valves 36a and 36b and the discharge valves 38a and 38b are closed, the decrease in the drive current Id to the drive coil 26 is relaxed immediately before the valves are closed, and the inflow valves 36a and 36b and the discharge valves are discharged. 38a and 38b can be closed slowly.

  Further, the current value of the drive current Id energized to the drive coil 26 is maintained for a predetermined time Δt in the second half of the valve closing operation, and the kinetic energy (inertial energy) acting on the drive coil 26 is attenuated during that time. By weakening the closing force of the valves 36a and 36b and the discharge valves 38a and 38b, the valve closing operation is gently performed, and the noise such as an impact sound is effectively reduced.

  Further, the inflow valves 36a, 36b and the discharge valve 38a are reduced by lowering the close speed immediately before the closing, compared to the closing speed in the first half when the closing operation of the inflow valves 36a, 36b and the discharge valves 38a, 38b is started. , 38b does not take a long time, and the impact sound when the valve is closed is also suppressed, so that the generation of noise is effectively suppressed.

Further, in the latter half of the closing operation of the inflow valves 36a and 36b and the discharge valves 38a and 38b, the current value of the drive current Id supplied to the drive coil 26 is kept constant at a predetermined time Δt and a current value I2. The inflow valves 36a, 36b and the discharge valves 38a, 38b are closed gradually by energizing differently from the first half of the close operation of the inflow valves 36a, 36b and the discharge valves 38a, 38b. In addition, it is possible to suppress noise associated with the impact sound when the valve is closed.

  Further, since the inflow valves 36a and 36b and the discharge valves 38a and 38b are urged in the closing direction of the flow paths by the arm portions 54a and 54b provided on the valve shaft 52 of the valves, the driving is performed. In the first half of the closing operation of the inflow valves 36a and 36b and the discharge valves 38a and 38b, the drive current Id energized to the coil 26 is changed so that the drive current Id decreases rapidly, and the valve body 58 is Since the valve is biased in the closing direction, the valve can be quickly closed. On the other hand, in the second half of the closing operation of the inflow valves 36a and 36b and the discharge valves 38a and 38b, the change in the drive current Id is gradually decreased, unlike the first half, so that the inflow valves 36a and 36b. Further, the closing operation of the discharge valves 38a and 38b is performed gently. Thereby, generation | occurrence | production of the noise at the time of the valve body 58 of a valve colliding with valve seat 48a, 48b, 50a, 50b can be suppressed, and the noise at the time of the driving | operation of the pump apparatus 10 can be reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, it can implement in a various aspect in the range which does not deviate from the meaning of this invention. For example, the pump device may include a drive magnet in the drive unit and a drive coil in the fixed unit. Further, the shape of the valve is not limited to that shown in the above embodiment, and it goes without saying that various valves can be applied.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the pump apparatus which concerns on one Embodiment of this invention, (a) is a top view of the pump apparatus, (b) is an AA sectional view taken on the line, (c) is a BB sectional view. FIG. FIG. 2 is an exploded perspective view of the pump device shown in FIG. 1 as viewed obliquely from above. It is the exploded perspective view of a pump device, and is the figure seen from the slanting lower direction. It is the figure which showed the structure of the on-off valve (passive type check valve) provided in the fluid flow path of this pump apparatus. It is the figure shown in order to demonstrate the operating state of this pump apparatus. It is operation | movement explanatory drawing of the opening / closing valve in this pump apparatus and an operation state. In order to explain the control method of the pump device of the present invention, the timing chart of the waveform pattern of the drive current energized to the drive coil is shown. It is the figure shown in order to demonstrate the relationship between energization of the drive current to this drive coil, and the opening / closing operation | movement of a valve | bulb.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pump apparatus 20 Inner yoke 22a, 22b Drive magnet 26 Drive coil M Drive part S Fixed part 28 Outer yoke 30 Reservoir part 30a First pump chamber 30b Second pump chamber 32a Inlet 34a Discharge port 36a, 36b Inlet valve 38a, 38b Discharge valve

Claims (5)

An inlet for sucking fluid; a reservoir connected to the inlet for storing the fluid sucked from the inlet; a discharge port for discharging the fluid stored in the reservoir; and In a control method of a pump device having a volumetric pump that changes volume,
The volume pump has a drive unit that is driven by a drive unit to change the volume of the reservoir, and the drive unit has a drive coil as the drive unit,
The drive current energized to the drive coil is a valve that opens and closes the flow path between the inlet or the outlet and the reservoir disposed between the inlet and the outlet and the reservoir. Control of the pump device characterized in that the valve closing operation is performed slowly by applying a driving current to the driving coil after starting the closing operation so that the driving current is different in the first half and the second half. Method.   The drive current energized to the drive coil is energized differently in the first half and the second half by maintaining a current value for a predetermined time in the second half, and the valve closing operation is performed slowly. The control method of the pump apparatus which concerns on 1 description.   The valve closing operation is performed slowly by energizing the driving coil to reduce the closing speed immediately before closing, compared to the closing speed in the first half when the valve starts closing operation. The method for controlling a pump device according to claim 1 or 2, wherein An inlet for sucking fluid; a reservoir connected to the inlet for storing the fluid sucked from the inlet; a discharge port for discharging the fluid stored in the reservoir; and In a control method of a pump device having a volumetric pump that changes volume,
The positive displacement pump has a drive unit that is driven by a drive unit to change the volume of the reservoir, and a fixed unit that supports the drive unit in a drivable manner.
The drive unit includes one of a drive magnet and a drive coil, and the fixed unit includes either the drive magnet or the drive coil, and the drive magnet and the drive coil are magnetically attracted to each other. The drive unit is configured to be movable by force or magnetic repulsive force,
The drive current energized to the drive coil is a valve that opens and closes the flow path between the inlet or the outlet and the reservoir disposed between the inlet and the outlet and the reservoir. After starting the closing operation, the current value of the driving current supplied to the driving coil in the second half is maintained for a predetermined time, and the valve closing operation is gently performed by supplying power different from the first half. A control method of the pump device. An inlet for sucking fluid; a reservoir connected to the inlet for storing the fluid sucked from the inlet; a discharge port for discharging the fluid stored in the reservoir; and In a control method of a pump device having a volumetric pump that changes volume,
A valve that opens and closes the flow path between the inlet or the outlet and the reservoir between the inlet and the outlet and the reservoir and is biased in the closing direction;
Furthermore, the drive unit of the positive displacement pump that is driven by the drive means and changes the volume of the reservoir is provided with either a drive magnet or a drive coil, and a fixed part that supports the drive unit in a drivable manner, One of the drive magnet and the drive coil is provided, the drive unit is configured to be movable by the mutual magnetic attraction force or magnetic repulsion force of the drive magnet and the drive coil, and the valve starts closing operation A control method for a pump device, characterized in that the valve closing operation is gently performed by energizing a drive current energized to a later drive coil so as to be different between the first half and the second half.

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