JP2007040194A - Method for driving reciprocating pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for driving a pump materializing high delivery pressure, larger capacity flow without pulsation even if the pump of a compact structure is operated with low electric power. <P>SOLUTION: This method includes a step "a" moving a moving element upward during a first period from a condition where the moving element is separate from a plunger until the moving element abuts on the plunger in one cycle motion of up and down motion of the plunger, a step b discharging liquid in the pump chamber and the cylinder by moving the moving element upward after making the moving element strikingly abut on the plunger with resisting against energizing force of the spring during a second period until the plunger reaches top dead center after completion of the first period, and a step c making liquid flow in the pump chamber during a third period until the moving element moves down to a bottom dead center and moves up again to abut on the plunger when the plunger moves down from top dead center with having a little delay to motion of the moving element and reaches bottom dead center and gets in a standstill condition after completion of the second period. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a driving method of a reciprocating pump (hereinafter referred to as a pump). More specifically, a plunger slidably provided in the cylinder and biased toward the bottom dead center side by a spring, and the plunger as a liquid pump is moved up and down at a high speed of 10 to 30 times / second. In addition, in a pump having a moving element intermittently contacting the plunger, the vertical movement of the moving element is transmitted to the plunger, and the spring strength is increased so that the plunger can move up and down 10 to 30 times / second. A high-speed fine vibration of the liquid discharged out of the pump chamber is provided at the subsequent stage of the discharge valve by setting and opening / closing the suction valve and the discharge valve following the suction process and the discharge process of the plunger. The present invention relates to a method for driving a pump which is smoothed by a resilient resin tube or the like so as to be substantially non-pulsating.

  An object of the present invention is to provide a crank mechanism having an improved efficiency by reducing the side pressure generated between the slider and the sliding portion when the slider is operated by the crank or vice versa. A pump is disclosed in Patent Document 1, for example.

  The crank mechanism disclosed in Patent Document 1 includes a slider that pivotally supports one of the connecting rods and is slidably provided on the sliding portion, and the connecting rod of the sliding portion. A parallel passage composed of two passages provided in parallel at a distance from each other at the end of the direction, and pivotally supported by the other of the connecting rods and rotatably positioned in the parallel passage. A connecting rod that is swingably provided on the other of the connecting rods, and a crank pin of a crankshaft that is rotatably provided on the connecting rod.

  Further, for example, Patent Document 2 discloses a pump that aims to provide a glass electromagnetically driven pump with high uniformity in gas flow rate, which is suitable for transporting or circulating corrosive gas or highly reactive gas without leakage. Is disclosed.

  The pump disclosed in Patent Document 2 is provided with an exhaust port or an intake port at one end and a glass cylinder having a check valve mechanism, and is provided in the cylinder. A glass plunger that can slide in a cylinder, and is provided in close integration with the inner wall of the glass plunger, with an opening on the exhaust port side or the intake port side, and a sealed portion on the opposite side Forming or forming a sealed portion on both the exhaust port side and the intake port side, the glass communicating member having a vent hole formed in the sealed portion, connected to the end of the glass communicating member, A glass-coated connecting member that encloses a rod-shaped magnetic body in a sealed manner, surrounds the outer periphery of the driving-coated glass-coated magnetic member at a certain interval, and is connected to the glass cylinder, Inside glass connecting pipe For driving the driving glass-coated magnetic member, one or more electromagnetic drive coil arranged to surround the glass connecting tube, in which more made.

  Further, Patent Document 3 discloses that an eccentric cam is used as a cam of a plunger pump that uses a stepping motor as a drive source.

  In the case of the conventional diaphragm pump and the plunger pump, the flow of the discharged liquid is not a complete non-pulsating flow. For example, in the case of the pump disclosed in Patent Document 4, the pulsation that changes depending on the change of the operating condition is automatically detected. In order to always compensate and operate without pulsation, decrease the discharge amount at the beginning of the discharge period of the dialam pump, and drive the plunger in the discharge direction just before that period to increase the volume of the pump chamber. The decrease in the pump chamber volume is made larger than the decreasing discharge amount, and the working fluid corresponding to the difference is discharged from the discharge mechanism. Further, a pulsation sensor is provided in the discharge side pipe line, and the control unit detects pulsation based on a signal of this sensor. Then, the control unit adjusts the discharge amount of the discharge mechanism so as to eliminate this pulsation.

  Further, in the case of the pump disclosed in Patent Document 5, the discharge amount decreases at the initial stage of the discharge period of the diaphragm pump constituting the pump. The plunger of the diaphragm pump is driven and controlled before the discharge period and during the compensation period between the suction period and the volume of the pump chamber is reduced slightly larger than the decrease amount of the discharge amount. In the compensation period, a sub chamber for increasing the pump chamber volume is provided, and the decrease amount of the pump chamber volume is corrected by the increase amount of the sub chamber volume, thereby obtaining a compensation amount equal to the discharge amount decrease amount. By making it possible to adjust the increase in the volume of the sub chamber, it is possible to cope with changes in operating conditions.

JP-A-8-303254 JP 2002-106463 A JP-A-2-64273 JP 2004-232616 A JP 2004-108188 A

  When the cam mechanism disclosed in Patent Document 3 is used, when the rotation speed of the motor is increased, the plunger is urged to the bottom dead center side when the plunger and the crank drive unit are always in contact. If the strength of the spring is strong, the wear on the plunger side wall will increase and the pump life will be shortened. In addition, since the responsiveness of the check valve cannot cope with high speed, there is a problem that the suction side valve and the discharge side valve are opened simultaneously at a relatively low rotation, and the discharge amount is reduced.

  Furthermore, although some conventional diaphragm pumps and plunger pumps use a plurality of pumps or provide a sub chamber to make the pulsation artificially non-pulsating (rectify), there is substantially no pulsating flow. No pump has yet been proposed. In addition, in a gas concentration measurement device that uses an absorption liquid, if there is a pulsating flow in the absorption liquid feeding, the measured value tends to oscillate, and in order to prevent this, the responsiveness of the measurement value indication can be slowed down. It is done. In order to realize a measuring device with excellent responsiveness, a substantially non-pulsating pump is desired.

  Such conventional problems are that the plunger and the crank drive part are always in contact, the return force of the plunger and the spring is not optimized, the response of the intake valve and the discharge valve, and the rotation speed of the motor are optimized By not being. The present invention provides a method for driving a pump so that not only a high discharge pressure and a large capacity can be obtained but also a substantially non-pulsating flow can be obtained even when the pump is operated with low power using a compact pump. It is intended to provide.

The first aspect of the present invention is:
A pump room,
A suction passage extending in the vertical direction for sucking the liquid into the pump chamber via a suction valve that is opened when the liquid is sucked into the pump chamber;
A discharge path extending in the vertical direction for discharging the liquid out of the pump chamber via a discharge valve that is opened when the liquid is discharged from the pump chamber;
A cylinder in communication with the pump chamber;
A plunger slidably provided in the cylinder and biased toward the bottom dead center by a spring;
A mover that intermittently contacts the plunger;
A method of driving a pump comprising:
(A) Turn on the power to the stopped pump, start the electric motor, convert the rotary motion of the rotating shaft of the electric motor into the vertical motion of the moving element, and transmit the vertical movement of the moving element to the plunger And moving the mover upward during a first period from the state in which the mover is separated from the plunger to the contact with the plunger in one cycle of the up and down movement of the plunger. ,
(B) Of the one cycle of the vertical movement, the movement is performed against the biasing force of the spring during the second period after the end of the first period until the plunger reaches top dead center. Moving the child after strikingly contacting the plunger, opening the suction valve, closing the discharge valve, and discharging the liquid in the pump chamber and cylinder;
(C) Of the one-cycle motion of the vertical motion, after the end of the second period, the plunger descends from the top dead center with a slight delay from the movement of the moving element, reaches the bottom dead center, and is stationary. In this case, the suction valve is opened and the discharge valve is closed during the third period from when the slider descends to the bottom dead center and then rises again until it comes into contact with the plunger. Flowing the liquid; and
(D) The method includes a step of repeatedly executing the step (b) and the step (c) until the power of the pump is turned off after the third period.

The second aspect of the present invention is:
A pump room,
A suction passage extending in the vertical direction for sucking the liquid into the pump chamber via a suction valve that is opened when the liquid is sucked into the pump chamber;
A discharge path extending in the vertical direction for discharging the liquid out of the pump chamber via a discharge valve that is opened when the liquid is discharged from the pump chamber;
A cylinder in communication with the pump chamber;
A plunger slidably provided in the cylinder and biased toward the bottom dead center by a spring;
A mover that intermittently contacts the plunger;
A method of driving a pump comprising a motion conversion means for converting a rotary motion of a rotary shaft of an electric motor into a vertical motion of the moving element,
(A) Turn on the power to the stopped pump, start the electric motor, convert the rotary motion of the rotating shaft of the electric motor into the vertical motion of the moving element, and transmit the vertical movement of the moving element to the plunger And moving the mover upward during a first period from the state in which the mover is separated from the plunger to the contact with the plunger in one cycle of the up and down movement of the plunger. ,
(B) After the end of the first period, during the second period until the plunger reaches top dead center, the slider is hit against the plunger against the biasing force of the spring, And closing the suction valve and opening the discharge valve to discharge the liquid in the pump chamber from the discharge valve;
(C) After the end of the second period, the plunger descends from the top dead center with a slight delay from the movement of the moving element, and after the moving element descends to the bottom dead center before reaching the bottom dead center. During the third period until it rises again and abuts against the plunger, opens the suction valve and closes the discharge valve to flow liquid into the pump chamber;
(D) The method includes a step of repeatedly executing the step (b) and the step (c) until the power of the pump is turned off after the third period.

The intake valve and the discharge valve are
A lower flow path and an upper flow path that are in communication with each other and through which the liquid flows;
A valve seat provided at a connection portion between the lower channel and the upper channel;
A valve body provided in the upper flow path;
A check valve provided with a movement restricting means for restricting the movement distance of the valve body,
It is preferable that the valve body includes a main body provided so as to be supported by the valve seat, and an adjusting unit provided on a lower side of the main body for adjusting the open / close response of the check valve. .

  According to the pump driving method of the present invention, (a) power is turned on to a stopped pump, the electric motor is started, and the rotational movement of the rotating shaft of the electric motor is converted into the vertical movement of the moving element. The vertical movement of the movable element is transmitted to the plunger, and the movement of the plunger in one cycle of the first period is from the state where the movable element is separated from the plunger to the first period. (B) during the second period until the plunger reaches top dead center after the end of the first period in the movement of one cycle of the up-and-down movement. The slider is moved against the plunger against the biasing force of the spring and moved upward, the suction valve is opened, the discharge valve is closed, and the liquid in the pump chamber and cylinder is discharged. Discharge (C) Of the one-cycle movement of the vertical movement, after the end of the second period, the plunger descends from the top dead center with a slight delay from the movement of the moving element and reaches the bottom dead center. During the stationary state, the moving element descends to the bottom dead center and then rises again, and during the third period until it contacts the plunger, the suction valve is opened and the discharge valve is closed, A step of flowing a liquid into the pump chamber; and (d) a step of repeatedly executing the step of (b) and the step of (c) until the power supply of the pump is shut off after the end of the third period. Even if it is operated with low power, not only high discharge pressure and large capacity can be obtained, but also substantially no pulsating flow can be obtained. According to the pump driving method of the third aspect, the valve body is provided on the valve seat so as to be supported by the valve seat, and the adjustment for adjusting the open / close response is provided on the lower side of the main body. Since the check valve provided with the means is provided, the responsiveness of the suction valve and the discharge valve is remarkably improved.

  For this reason, for example, incineration facilities use chemicals corresponding to the hydrogen chloride concentration for the purpose of removing hydrogen chloride in the exhaust gas. However, since the responsiveness of the measuring device is poor, rapid control is not possible and excessive chemicals are used. In other words, waste chemicals cause secondary pollution. Therefore, if the pump driving method of the present invention is applied to a hydrogen chloride measuring device, the response can be improved and the dosage of the drug can be optimized, and the spread of secondary pollution can be prevented.

  In addition to this, the pump driving method of the present invention includes a continuous mixing and injection of various raw materials in the chemical and food industries, a paint transfer system in a coating line, a mixed transfer of ink in a printing process, a continuous quantitative injection of chemical raw materials, and various additives. Can be applied to even mixing.

  A method for driving a pump according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1 is an explanatory diagram showing a pump of the present invention, FIG. 2 is an explanatory diagram showing an example of a buffer tank applied to the pump of FIG. 1, and FIG. 3 is a graph schematically explaining a driving method of the pump of the present invention, 4 is a graph showing the relationship between the motor rotation speed and the discharge amount of the pump of FIG. 1, FIG. 5A is a cross-sectional explanatory view showing an example of a check valve applied to the pump of FIG. (B) is sectional explanatory drawing which shows the structure of a valve body, FIG. 6 is sectional explanatory drawing which shows the stator of the non-return valve of FIG.

Embodiment 1
Referring to FIG. 1, a pump 1 according to the present embodiment has a pump chamber 17 and a vertical direction for sucking liquid into the pump chamber 17 through a suction valve V <b> 1 that is opened when the liquid is sucked into the pump chamber 17. A suction passage 34 extending in the vertical direction, a discharge passage 43 extending in the vertical direction for discharging the liquid out of the pump chamber 17 through a discharge valve V2 opened when discharging the liquid from the pump chamber 17, and the pump chamber 17 A cylinder 11 communicated with the plunger 11, a plunger 12 slidably provided in the cylinder 11 and urged toward the bottom dead center side by a spring 16, and abuts against the plunger 12 to strike the plunger 12 upward. The movable element P is configured to move up and down via a motion converting means for converting the rotational motion of the rotating shaft 21 of the electric motor 22 into a vertical motion, and the descending plunger 12 and the movable element P They are spaced apart. Since the pump 1 of the present invention operates at high speed, it generates a liquid flow with high-speed vibration outside the pump chamber 17. The flow of the high-speed vibration liquid becomes non-pulsating (smoothed) by a resin tube in the piping system connected to the pump 1.

  A buffer tank 50 may be provided between the outlet of the discharge valve V2 and the discharge path 43. Even in this way (see FIG. 2), the pulsation of the liquid discharged by the pump 1 can be smoothed.

  As the motion conversion means, for example, the one shown in FIG. 1 is adopted. 1 includes a crank arm 20a connected to a rotating shaft 21 of a motor 22, a connecting rod 20 having one end pivotably attached to the crank arm 20a via a crank pin 20b, The connecting rod 20c is swingably attached to the other end of the connecting rod 20c, and is composed of a crank slider P that slides in a cylindrical sleeve S. However, the motion conversion means of the present invention is not limited to such a configuration. For example, in addition to a cam eccentrically connected to the rotating shaft 21 of the motor 22, modifications, changes or variations obvious to those skilled in the art are included in the present invention.

  The important point of the driving method of the pump according to the present embodiment is that the pump chamber 17 is in the process until the plunger 12 returns from the bottom dead center DC1 to the top dead center DC2 and then returns to the bottom dead center DC1 again. As a liquid pump, the plunger 12 is moved up and down at a high speed of 10 to 30 times / second so that the flow of liquid discharged to the outside is substantially non-pulsating. In the suction process from the top dead center DC2 of the plunger 12 to the bottom dead center DC1 corresponding to the half cycle of the In the discharging process until the plunger 12 reaches the top dead center DC2 from the bottom dead center DC1 corresponding to the remaining half cycle of the one cycle of the vertical movement, the suction valve V1 is closed and the discharge valve V2 is closed. The strength of the spring 16 is set so that the liquid filled in the pump chamber 17 and the cylinder 11 can be discharged, and the opening / closing operation of the suction valve V1 and the discharge valve V2 is performed according to the suction process and discharge of the plunger 12. The weight and size of the valve body of the suction valve V1 and the discharge valve V2 are set so that the process can be followed (that is, the strength of the spring 16 and the weight and size of the suction valve and the discharge valve are optimized to increase the speed. In response to the operation, the flow of liquid discharged out of the pump chamber 17 is substantially non-pulsating). In other words, the positional relationship between the plunger 12 and the crank slider P is adjusted so that the slider P does not always come into contact.

  Next, a driving method of the pump 1 of the present invention will be schematically described (see FIG. 4). Reference numeral W2 in the drawing is a schematic diagram showing the relationship between the time of the plunger 12 and the process, and W1 is a schematic diagram showing the relationship between the time of the crank slider P and the process.

  Power is supplied to the pump 1 that is stopped, the motor 22 is started, and the crank movement is performed during the first period T1 from when the crank slider P is separated from the plunger 12 until it comes into contact with the plunger 12. The child P is moved upward (step (a)).

  After the end of the first period T1, the crank slider P is strikingly contacted against the plunger 12 against the biasing force of the spring 16 during the second period T2 until the plunger 12 reaches the top dead center DC2. Then, it is moved upward, the suction valve V1 is closed, the discharge valve V2 is opened, and the liquid in the pump chamber 17 is discharged from the discharge valve V2 (step (b)).

  After the end of the second period T2, the plunger 12 descends from the top dead center DC2 with a slight delay from the movement of the moving element (indicated by the broken line W2 in FIG. 3), reaches the bottom dead center, and is stationary. During the third period T3 from when the slider descends to the bottom dead center and then rises again until it contacts the plunger 12, the suction valve is opened and the discharge valve is closed, so that the liquid is supplied to the pump chamber. Inflow (step (c)).

  As described above, by providing the stationary period at the position of DC1, it is possible to allow a delay in the operation of the plunger 12, and the extra force applied to the cylinder 11 is released.

  After the end of the third period T3, step (b) and step (c) are repeatedly executed until the power supply of the pump 1 is cut off (step (d)).

  The vertical movement obtained by the driving method of the present embodiment is 10 to 30 times / second, which is a high speed for a liquid pump (this is as if a micro-vibration state is sustained when viewed with human eyes). In addition, the pulsating flow is absorbed by a flexible tube or the like connected to become substantially pulsating.

  Note that the ratio of the third period T3 to the second period T2 (T3 / T2) is in the range of 1 <(T3 / T2) <1.2 in order to maximize the pump discharge force. However, it is advantageous when the stress applied to the cylinder 11 is released by the plunger 12 when (T3 / T2) is 1.

  Further, when the check valve shown in the second embodiment described later is applied to the pump 1 of the present embodiment, the responsiveness of the suction valve and the discharge valve can be optimized.

  The pump 1 of the present embodiment can also be driven as follows.

  Power is supplied to the pump 1 that is stopped, the motor 22 is started, and the crank movement is performed during the first period T1 from when the crank slider P is separated from the plunger 12 until it comes into contact with the plunger 12. The child P is moved upward (step (a1)).

  After the end of the first period T1, during the second period T2 until the plunger 12 reaches the top dead center DC2, the crank slider P is hit against the plunger against the biasing force of the spring 16. The suction valve V1 is closed, the discharge valve V2 is opened, and the gas in the pump chamber 17 is compressed and discharged from the discharge valve V2 (step (b1)).

  After the end of the second period T2, the plunger 12 descends from the top dead center DC2 with a slight delay from the movement of the moving element, and before reaching the bottom dead center DC1, the moving element descends to the bottom dead center DC1. During the third period T3 until it rises again and comes into contact with the plunger 12, the suction valve V1 is opened, the discharge valve V2 is closed, and the liquid flows into the pump chamber 17 (step (c1)). .

  After the end of the third period T3, step (b1) and step (c1) are repeatedly executed until the power supply of the pump 1 is cut off (step (d1)). At this time, in the period T1, an allowance time for releasing the force is given to the plunger that descends slightly with respect to the crank during the period T3.

  Note that the ratio of the third period T3 to the second period T2 is a value close to 1.2.

  Further, when the check valve shown in the second embodiment described later is applied to the pump 1 of the present embodiment, the responsiveness of the suction valve and the discharge valve can be optimized.

  According to the pump driving method of the present embodiment, the flow of the liquid discharged outside the pump chamber 17 is substantially non-pulsating due to a flexible tube or the like.

Embodiment 2
Referring to FIGS. 5 (a), 5 (b) and FIG. 2, the check valve V1 suitably used in the pump of the present invention extends in a direction perpendicular to the horizontal plane, and communicates with each other and flows through the lower side. A flow path 34 and an upper flow path 33; a valve seat 35 provided at a connection portion between the lower flow path 34 and the upper flow path 33; and a valve provided in the valve seat 35 and the upper flow path 33. It comprises a body 36 and movement restriction means 37 for restricting the movement distance of the valve body 36.

  The valve body 36 includes a substantially spherical main body 36a provided so as to be supported by the valve seat 35, a sphere 36b provided below the main body 36a, and a connecting portion interposed between the main body 36a and the sphere 36b. It is comprised from the elongate rod-shaped body 36c which functions as. And the spherical body 36b and the rod-shaped body 36c function as an adjustment means for adjusting the open / close responsiveness of the check valve V1.

  In the present embodiment, the spherical body 36b and the rod-shaped body 36c give buoyancy to the main body 36a and receive the flow of the liquid, so that the pump can move at high speed (10 to 30 times / second) and reliably open and close the valve. Realized. As the sphere 36b, for example, a glass sphere provided on the lower side of the main body 36a is adopted, but the sphere 36b is not limited to a glass sphere. In addition to glass spheres, glass mushrooms, glass cowls and the like that are obvious to those skilled in the art are suitable for pressure reception. Furthermore, the main body 36a, the sphere 36b, and the rod-like body 36c are not limited to the solid substance of glass, and it is preferable to embed one or more metal weights depending on the specific gravity of the liquid. Further, depending on the specific gravity of the liquid, it may be a hollow body.

  Further, as shown in the figure, the rod-like body 36c positions the main body 36a at the center of the valve seat 35, prevents the rampage, and enables a smooth opening and closing high-speed operation. The shape of the rod-shaped body 36c is not limited to a cylindrical shape. All modifications, changes, and modifications obvious to those skilled in the art are included, such as a prismatic shape, a conical shape, a pyramid shape, a combined shape of cones, and a combined shape of pyramids.

  In the state where the main body 36a is in contact with the valve seat 35, depending on the size of the plunger 12 and the like, for example, the diameter of the plunger 12 is about 12.5 mm, and the diameter of the free end of the main body 36a of the check valve is about In the case of 12 mm, the free end of the main body 36a and the free end of the stator 37a are preferably separated by about 2 mm, but the value is not limited to this.

  In the case of this embodiment, the valve seat 35 has a substantially conical shape. However, the valve seat 35 is not limited to an inverted conical shape, and may be, for example, an annular shape.

  In the case of the present embodiment, the main body 36a has a substantially hemispherical shape, and the free end of the main body 36a is a substantially circular flat surface. A gap CL2 (depending on the size of the plunger 12 or the like, for example, the diameter of the plunger 12 is about 12.5 mm and the check valve is between the spherical body 36b and the rod-shaped body 36c and the lower flow path 34. When the diameter of the free end of the main body 36a is about 12 mm, it is about 0.5 to 2 mm), so that a liquid flow path is secured. However, the shape of the main body 36a is not limited to a hemispherical shape, and may be, for example, a shape cut by a plane including the minor axis of the spheroid.

  The movement restricting means 37 is a substantially hemispherical stator 37 a supported on the inner surface of the upper flow path 33. However, the shape of the stator 37a is not limited to a hemispherical shape, and may be, for example, a shape cut by a plane including the minor axis of the spheroid. The free end of the stator 37a is a substantially circular flat surface. More specifically, the stator 37a is fixed to the upper flow path 33 via an I-shaped support portion 37b that partially closes the upper flow path 33 (see FIG. 5). A gap CL1 between the upper flow path 33 and the stator 37a (depending on the size of the plunger 12, etc., for example, the diameter of the plunger 12 is about 12.5 mm, and the free end of the check valve body 36a is When the diameter is about 12 mm, it is about 0.5 to 2 mm), and thereby a liquid flow path is secured.

  With this configuration, the check valve V1 of the present embodiment is excellent in open / close response and can be applied to the pump 1 of the present invention to increase the pump head.

  The invention is explained in more detail on the basis of examples. However, the present invention is not limited to the examples.

First, an experiment was performed using a plunger of 100 cc (35.5 mm in diameter).
(1) When the amount of movement of the plunger per time was 3 mm, the discharge amount per 1800 times was 9000 cc.
(2) When the amount of movement of the plunger per time was 1 mm, the discharge amount per 1800 times was 5400 cc.
(3) When the amount of movement of the plunger per time was 0.5 mm, the discharge amount per 1800 times was 1800 cc.

Next, an experiment was conducted using a 5 cc (12 mm diameter) plunger.
(4) When the amount of movement per plunger was 3 mm, the discharge amount per 1800 times was 1080 cc.
(5) When the amount of movement of the plunger per time was 1 mm, the discharge amount per 1800 times was 720 cc.
(6) When the movement amount of the plunger per time was 0.5 mm, the discharge amount per 1800 times was 360 cc.

  Next, as the spring 16, there are three types of springs: a hard spring (spring constant is 300 kgw / m), a conventionally used spring (spring constant is 140 kgw / m), and a soft spring (spring constant is 100 kgw / m). Using a spring, the performance (discharge amount) of the pump with respect to the motor rotation speed (rpm) was measured. The result is shown in FIG. In the figure, reference symbol A shows a graph showing the performance of a pump using a spring having a spring constant of 100 kgw / m, and reference symbol B shows a graph showing the performance of a pump using a spring having a spring constant of 140 kgw / m. Reference numeral C indicates a graph showing the performance of a pump using a spring having a spring constant of 300 kgw / m.

(A) is sectional explanatory drawing which shows an example of the non-return valve of this invention, (b) is sectional explanatory drawing which shows the structure of a valve body. FIG. 2 is a cross-sectional explanatory view showing a stator of the valve of FIG. 1. It is explanatory drawing which shows the pump of this invention. It is the graph which showed typically the exercise | movement of the pump of this Embodiment. (A) is sectional explanatory drawing which shows an example of the non-return valve applied to the pump of FIG. 1, (b) is sectional explanatory drawing which shows the structure of a valve body. FIG. 6 is a cross-sectional explanatory view showing a stator of the valve of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump 11 Cylinder 12 Plunger 13 Branch pipe 16 Compression coil spring 17 Pump chamber 20 Crank means 20a Crank arm 20b Crank pin 20c Connecting rod 20d Pin 21 Rotating shaft 22 Electric motor 33 Pipe 34 Suction path 35 鍔 36a Main body 36b Sphere 36c Rod-shaped body 37 Movement restriction means 37a Stator 37b Support portion 43 Discharge path V1 Suction valve (check valve)
V2 discharge valve (check valve)
P Crank mover S Sleeve

Claims (3)

A pump room,
A suction passage extending in the vertical direction for sucking the liquid into the pump chamber via a suction valve that is opened when the liquid is sucked into the pump chamber;
A discharge path extending in the vertical direction for discharging the liquid out of the pump chamber via a discharge valve that is opened when the liquid is discharged from the pump chamber;
A cylinder in communication with the pump chamber;
A plunger slidably provided in the cylinder and biased toward the bottom dead center by a spring;
A mover that intermittently contacts the plunger;
A method of driving a pump comprising:
(A) Turn on the power to the stopped pump, start the electric motor, convert the rotary motion of the rotating shaft of the electric motor into the vertical motion of the moving element, and transmit the vertical movement of the moving element to the plunger And moving the mover upward during a first period from the state in which the mover is separated from the plunger to the contact with the plunger in one cycle of the up and down movement of the plunger. ,
(B) Of the one cycle of the vertical movement, the movement is performed against the biasing force of the spring during the second period after the end of the first period until the plunger reaches top dead center. Moving the child after strikingly contacting the plunger, opening the suction valve, closing the discharge valve, and discharging the liquid in the pump chamber and cylinder;
(C) Of the one-cycle motion of the vertical motion, after the end of the second period, the plunger descends from the top dead center with a slight delay from the movement of the moving element, reaches the bottom dead center, and is stationary. In this case, the suction valve is opened and the discharge valve is closed during the third period from when the slider descends to the bottom dead center and then rises again until it comes into contact with the plunger. Flowing the liquid; and
(D) A pump comprising the step of repeatedly executing the step of (b) and the step of (c) until the power supply of the pump is shut off after the end of the third period. Driving method. A pump room,
A suction passage extending in the vertical direction for sucking the liquid into the pump chamber via a suction valve that is opened when the liquid is sucked into the pump chamber;
A discharge path extending in the vertical direction for discharging the liquid out of the pump chamber via a discharge valve that is opened when the liquid is discharged from the pump chamber;
A cylinder in communication with the pump chamber;
A plunger slidably provided in the cylinder and biased toward the bottom dead center by a spring;
A mover that intermittently contacts the plunger;
A method of driving a pump comprising a motion conversion means for converting a rotary motion of a rotary shaft of an electric motor into a vertical motion of the moving element,
(A) Turn on the power to the stopped pump, start the electric motor, convert the rotary motion of the rotating shaft of the electric motor into the vertical motion of the moving element, and transmit the vertical movement of the moving element to the plunger And moving the mover upward during a first period from the state in which the mover is separated from the plunger to the contact with the plunger in one cycle of the up and down movement of the plunger. ,
(B) After the end of the first period, during the second period until the plunger reaches top dead center, the slider is hit against the plunger against the biasing force of the spring, And closing the suction valve and opening the discharge valve to discharge the liquid in the pump chamber from the discharge valve;
(C) After the end of the second period, the plunger descends from the top dead center with a slight delay from the movement of the moving element, and after the moving element descends to the bottom dead center before reaching the bottom dead center. During the third period until it rises again and abuts against the plunger, opens the suction valve and closes the discharge valve to flow liquid into the pump chamber;
(D) A pump comprising the step of repeatedly executing the step of (b) and the step of (c) until the power supply of the pump is shut off after the end of the third period. Driving method. The suction valve and the discharge valve,
A lower flow path and an upper flow path that are in communication with each other and through which the liquid flows;
A valve seat provided at a connection portion between the lower channel and the upper channel;
A valve body provided in the upper flow path;
A check valve provided with a movement restricting means for restricting the movement distance of the valve body,
The valve body includes a main body provided to be able to be supported by the valve seat, and an adjusting means provided on a lower side of the main body for adjusting the open / close response of the check valve. 2. The driving method according to 2 or 3.

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