JPS63314393A - Self priming pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a self-priming pump device used in a direct circulation bath unit or the like.

2. Description of the Related Art A conventional self-priming pump device is always driven at a constant rated rotation speed, and an example of the measurement results of its self-priming characteristics is shown in FIG. In the conventional example of Jin, the rated rotation speed or N = 35
The case of 0 rpm is shown, and it can be seen that the self-priming completion time is 1 minute and 48 seconds for a suction height of 2 m.

Problems to be Solved by the Invention Fig. 11 is a diagram showing an example of the measurement results of the self-priming pump device when the driving rotation speed of the conventional self-priming pump device is changed. In Fig. 11, In the case of Actual 11!31, that is, when the drive rotation speed is N = 3500 and pm (rated rotation speed), the self-priming completion time is 1 minute 4 for a suction height of 2 m.
8 seconds, but in the case of solid line 32, that is, N=300O
rpm, self-priming is completed in 1 minute and 8 seconds, and in the case of the solid line aaO, that is, at Nz 2500 rpm, self-priming is completed in 66 seconds. Despite the fact that the rated rotational speed determined by the model etc. does not necessarily match the rotational speed that optimizes self-priming performance,
Since the rotational speed during self-priming operation is the same as the rotational speed during pumping operation, there was a problem in that self-priming performance was not optimized.

In view of the above-mentioned problems, the present invention is intended to improve the self-priming performance of a self-priming pump device.

Means for Solving Problems In order to solve the problems of the above-mentioned conventional self-priming pump devices, the first invention of the present invention provides a self-priming pump driven by an electric motor, and a self-priming pump driven by an electric motor. The pump is comprised of a control circuit that controls the rotation speed of the motor since it is lower than the rated rotation speed when the pump is started.

In addition, in order to solve the problems of the conventional self-priming pump device, the second invention of the present invention provides a self-priming pump driven by an electric motor, and a self-priming pump that is driven by an electric motor, and when the self-priming pump is started, the motor The control circuit controls the rotational speed of the engine to a rotational speed lower than the rated rotational speed and gradually increases the rotational speed to the rated rotational speed.

Function: As described above, the first aspect of the present invention is to control the rotation speed of the motor to be lower than the rated rotation speed when starting a self-priming pump driven by an electric motor. The self-priming performance of the self-priming pump device can be improved.

Further, in a second aspect of the present invention, when starting a self-priming pump driven by an electric motor, the rotation speed of the motor is controlled to be lower than the rated rotation speed, and the rotation speed is gradually increased to the rated rotation speed. By doing so, the self-priming performance of the self-priming pump device can be improved.

Example Practical examples of the present invention will be explained below based on the drawings.

FIG. 1 is a diagram showing the configuration of a self-priming pump device in a first embodiment of the present invention. In FIG. 1, 1 is a self-priming pump, which is driven by an electric motor 2. In FIG. 3 is a control circuit that controls the rotation speed of the electric motor. Further, 4 is a suction port of the self-priming pump 1, and 5 is a discharge port of the self-priming pump 1.

Hereinafter, as an example, a case will be described in which the self-priming characteristics of the self-priming pump 1 have characteristics as shown in FIG. 11 in the conventional example with respect to the driving rotation speed. In the case of a self-priming pump having the self-priming characteristics shown in FIG. 11, as explained in the conventional example, the self-priming pump 1 is
oorpm), the self-priming completion time is 1 minute 4
8 seconds, while the self-priming completion time when operating at 2500 rpm, which is lower than the rated rotation speed, is 66 seconds. Because the rotation speed is lower than the rated rotation speed (in this example, 260°r
It can be seen that the self-priming completion time is shorter when driven at pm). Therefore, during self-priming operation, the self-priming pump 1t is driven at a rotation speed lower than the rated rotation speed, and when self-priming is completed, the rotation of the electric motor 2 is switched,
By configuring a control circuit that drives the self-priming pump 1 at a rated rotational speed to perform pumping operation, the self-priming performance of the self-priming pump device can be improved.

FIG. 2 shows the control circuit 3 in the first embodiment of the present invention.
FIG. In FIG. 2, reference numeral 6 denotes a motor drive circuit, which rotates the motor 2 at a predetermined rotation speed according to the rotation speed command signal 8 output from the rotation speed control circuit 7. The circuit 7 is formed with a rated rotation speed setting section 9 and a self-priming rotation speed setting section 1o, each setting section being determined in advance according to the pumping capacity required of the self-priming pump 1. The self-priming rotation speed (in this example, 2500 rpm) is set lower than the rated rotation speed (3500 rpm in this embodiment) and the rated rotation speed that optimizes the self-priming characteristics of the self-priming pump 1. Reference numeral 11 denotes an operation command input terminal, which inputs an operation command signal 12 to the rotation speed control circuit 7 and the self-priming completion detection circuit 13. The completion of self-priming of the self-priming pump 1 is detected, and the self-priming completion signal 14 is fully output to the rotation speed control circuit 7. In this first embodiment, the self-priming completion detection circuit 13 is A self-priming completion time setting section 15 is formed in a part of the timer circuit. 66 seconds), and the self-priming completion detection circuit 13 detects the self-priming completion detection circuit 13 when the time set by the self-priming completion time setting section 15 has elapsed since the operation command signal 12 was input. Suction completion signal 14t-output.

Next, the operation of this first embodiment will be explained.

When the operation command signal 12 is input from the operation command input terminal 11 to the rotation speed control circuit 7, the rotation speed control circuit 7 receives the rotation speed command signal set by the self-priming rotation speed setting section 10. 8 to the drive circuit 6, and the self-priming pump 1 starts self-priming operation at the self-priming rotation speed.

At the same time, the operation command signal 12 is input to the self-priming completion detection circuit 13 (timer LE!I signal). Thereafter, when the time set by the self-priming completion time setting section 16 (66 seconds in this embodiment) has elapsed, the self-priming completion detection circuit 13 informs the rotation speed control circuit 7 that the self-priming completion is completed. A signal 14 is output. When the self-priming completion signal 14 is input from the self-priming completion detection circuit 13, the rotation speed control circuit 7 converts the rotation speed command signal 8 outputted to the drive circuit δ into the self-priming rotation. The value set in the number setting unit 10 is switched to the value set in the rated rotation speed setting unit 9, and the self-priming pump 1 starts pumping operation at the rated rotation speed.

Next, a second embodiment of the present invention will be described.

The basic configuration of the self-priming pump device in this second embodiment is the same as that in the first embodiment shown in Figure dX1, but the configuration of the self-priming completion detection circuit in the control circuit 3 is different from that in the first embodiment. This is different from the actual example. FIG. 3 is a diagram showing the configuration of the 1"1j control circuit 3 in the second example. In FIG. 6 is a motor drive circuit, 7 is a rotation speed control circuit, 8 is a rotation speed command signal, 9 is a rated rotation speed setting section, 10 is a self-priming rotation speed setting section, 11 is an operation command input terminal, 12 is an operation command signal, 13 is a self-priming completion detection circuit, and 14 is a self-priming completion signal. In this second embodiment, the self-priming completion detection circuit 13 is a current comparison circuit, and a part of the self-priming completion detection circuit 13 is Motor current setting section 16 formed in
compares the current value set in advance with the motor current signal 17 output from the drive circuit 6, and when the motor current signal 17 exceeds the current value set by the motor current setting section 16, the The self-priming completion signal 14 is output to the rotation speed control circuit 7. FIG. 4 shows the rotation speed of the self-priming pump 1 set by the self-priming rotation speed setting section 10 (
FIG. 4 is a diagram showing the motor current signal 17 output from the drive circuit 6 when the motor is driven at a speed of 2500 rpm in this embodiment. In FIG. 4, the motor current value is 0.36 to 0.56 A for about 60 seconds after the electric motor 2 starts operating, that is, during the self-priming operation of the self-priming pump 1. When self-priming is completed and pumping operation is started, the motor current value rapidly increases to 1A. therefore,
If the setting value of the motor current setting section 16 is set to an appropriate value between 0.56 A and 1 A, the completion of self-priming operation can be detected.

The operation of the one-branch pump device shown in this second embodiment is as follows. When the operation command signal 14 is input from the operation command input terminal 11 to the rotation speed control circuit 7, the rotation speed control circuit 7 controls the self-priming rotation speed setting section 10.
The rotation speed command signal 8 set in is outputted to the drive circuit 6, and the self-priming pump 1 starts self-priming operation at the self-priming rotation speed. The self-priming completion detection circuit 13 converts the motor current signal 17 outputted from the drive circuit 6 into a motor current setting value set by the motor current setting section 16 and measured in advance and known (in this embodiment, 0 .8A)
In comparison, when the motor current signal 17 exceeds the current setting value, the self-priming completion signal 14 is output to the rotation speed control circuit 7.

When the self-priming completion signal 14 is input from the self-priming completion detection circuit 13, the rotation speed control circuit 7 converts the rotation speed command signal 8 outputted to the drive circuit 6 into the self-priming rotation. The value set in the number setting unit 10 is switched to the value set in the rated rotation speed setting unit 9, and the self-priming pump 1 starts pumping operation at the rated rotation speed.

Next, a third embodiment of the present invention will be described.

The basic configuration of the self-priming pump device in this third embodiment is the same as that in the first embodiment shown in FIG. 1, but the configuration of the self-priming completion detection circuit in the control circuit 3 is This is different from the first embodiment. FIG. 6 is a diagram showing the entire configuration of the control circuit 3 in the third embodiment. Fifth
In the figure, as in the case of the first embodiment shown in FIG. 2, 6 is a motor drive circuit, 7 is a rotation speed control circuit, 8 is a rotation speed command signal, 9 is a rated frequency 1 stroke setting unit, 10 is a self-priming rotation speed setting unit, 11 is an operation command input terminal, 12 is an operation command signal, 13 is a self-priming completion detection circuit, and 14 is a self-priming completion signal. In the third embodiment, the self-priming completion detection circuit 1
3, upon detecting a water flow detection signal 19 output from the water flow detection means 18 connected to the discharge port 6 of the self-priming pump 1, sends a 1iIJ self-priming completion signal 14 to the rotation speed control circuit 7. Output.

The operation of the self-priming pump device shown in the third embodiment is as follows. When the operation command signal 12 is input from the operation command human power hanger 11 to the rotation speed control circuit 7, the rotation speed control circuit 7 controls the rotation speed set in the self-priming rotation speed setting section 10 in No. 01. A number command signal 8 is output to the drive circuit 6, and the self-priming pump 1 starts self-priming operation at the self-priming rotation speed. When self-priming is completed and the discharge port of the self-priming pump is filled with water, the water flow detection means 1
8 outputs the water flow detection signal 19. When the self-priming completion detection circuit 13 detects the water flow detection signal 19, it outputs the self-priming completion signal 14 to the rotation speed control circuit 7. The rotation speed control circuit 7 detects the completion of self-priming (mJ)! When the self-priming completion signal 14 is input from 813, the rotation speed command signal 8 output to the drive circuit 6 is changed from the value set in the self-priming rotation speed setting section 1o to the rated rotation in mJ. Switch to the value set in the number setting section 9,
The self-priming pump 1 starts pumping operation at the rated rotation speed.

FIG. 6 shows the self-priming characteristics of the self-priming pump devices of the first to third embodiments. In FIG. 6, a solid line 20 indicates the self-priming characteristic of the self-priming pump of the present invention, and a line 21 indicates the self-priming characteristic of the conventional self-priming pump (see FIG. 10).

Note that in the present invention, the rotation speed during self-priming operation is limited to a rotation speed lower than the rated rotation speed, and this is for the following reason. As already mentioned in the problem to be solved by the invention, the self-priming characteristics of a self-priming pump change depending on the driving rotation speed. The present inventor confirmed the above fact through experiments, and found that the self-priming performance of the self-priming pump used in the experiment was reduced when self-priming operation was performed at a rotation speed lower than the rated rotation speed. I found out that I can do it. However, the results of experiments conducted by the present inventor using a self-priming pump with a different structure from the above-mentioned self-priming pump show that even when self-priming operation is performed at a rotation speed higher than the rated rotation speed, It was confirmed that there are cases in which the same self-priming performance can be achieved as in the case of self-priming operation at the rated rotation speed. However, the rotation speed of the electric motor? In addition to the possibility of problems with the strength of the motor and an increase in noise and vibration of self-priming pumps, converting to a four-stroke system may cause problems with the motor's strength. It is an essential parameter that determines the specifications such as There is a possibility that you will be invited. For the reasons mentioned above, in the present invention, the rotation speed during self-priming operation is limited to a rotation speed lower than the rated rotation speed, thereby solving problems such as increased motor strength and increased noise and vibration of the self-priming pump. This also suppresses the problem of decreased motor efficiency during rated operation.

Next, each embodiment corresponding to the second aspect of the present invention will be described based on FIGS. 7 to 9.

Similar to the explanation of the above embodiment, as an embodiment, a case where the self-priming characteristics of the self-priming pump 1 have the characteristics as shown in FIG. 11 in the conventional example with respect to the driving rotation speed will be described. explain. In the case of a self-priming pump with the self-priming characteristics shown in Figure 11, the solid line 34
In the case of (N = 200 Or p m), the self-priming speed (suction height per unit time) is the maximum, and the suction height is 0.
．． Between 7 and 1.1, solid line 33 (N = 250
Or pm) or the self-priming speed is the maximum, and when the suction height is between 1.7 and 2 m, the solid line is 32 (N = 300
Or pm ) has the highest self-priming speed.

Therefore, during self-priming operation, the self-priming pump is started at a rotation speed lower than the rated rotation speed, the rotation speed is gradually increased to the rated rotation speed, and when self-priming is completed, the self-priming pump is started. Is it like driving at the rated speed and pumping water? By configuring the IR control circuit, the self-priming characteristic performance of the self-priming pump device can be improved.

The basic configuration of the self-priming pump device in the embodiment corresponding to the second invention of the present invention is the same as that of the first invention shown in FIG. 1, but the adjustment of the control circuit 3 is as described above. 1st~
This is different from the third embodiment.

FIG. 7 is a diagram showing the configuration of the control circuit 3 in the fourth embodiment. In Figure 7, the first
As in the case of the first embodiment of the invention, 6 is a motor drive circuit, 7 is a rotation speed control circuit, 8 is a rotation speed command signal, 9 is a rated rotation speed setting section, and 1° is a self-priming rotation speed setting. 11 is a driving command input terminal, and 12 is a driving command signal. The rotation speed control circuit 7 includes a rotation speed calculation circuit 22 and a self-priming rotation speed switching time setting section 23. The self-priming rotation speed is calculated from the information set by the suction rotation speed switching time setting section 23 and the self-priming time signal 25 output from the timer circuit 24.

The operation of the fourth embodiment will be explained below in Table 1. In the fourth embodiment, the pre-measured and known kettles shown in Table 1 are set in the mouth suction rotation I stroke number setting part 1° and the self-priming rotation speed switching time setting part 23. The self-priming rotation speed is set to gradually increase as time passes. When the driving command signal 12 is inputted from the driving command input terminal 11 to the timer circuit 24, the timer circuit 24 starts measuring time and outputs the self-priming time signal 26. At the same time, when the operation command signal 12 is input to the rotation speed control circuit 7, the rotation speed calculation circuit 22 of the rotation speed control circuit 7 outputs the self-priming time signal 26 and the self-priming rotation speed switching time setting. When the self-priming time signal 26 becomes equal to the first setting value, the first setting value of the self-priming rotation speed setting section 10 is Set value (2000r in this example)
pm) and set the electric motor 2 at the first setting value.
The rotation speed command signal 8 is outputted so that the rotation speed is rotated. As the self-priming operation progresses (time elapses), when the self-priming time signal 26 becomes equal to the second set value (16 seconds in this embodiment), the rotation speed calculation circuit of the rotation speed control circuit 7 22 selects a second setting value (2500 rpm in this embodiment) of the self-priming rotation speed setting unit 1o, and outputs the rotation speed command signal 8 so that the electric motor 2 rotates at the second setting value. Output. Thereafter, with the passage of time (28 seconds after the start of self-priming operation in this embodiment), the electric motor 2 changes to the third setting value of the self-priming rotation speed setting section 10 (3000 rpm in the normal example). ) is controlled to rotate. When the self-priming time signal 26 becomes equal to the fourth set value (36 seconds in this embodiment) of the self-priming rotation speed switching time setting section 23, the rotation speed control circuit 7 causes the drive circuit 6 to The rotation speed command signal 8'ft1 is output from the third setting value set by the self-priming rotation speed setting section 1° to the value set by the rated rotation speed setting section 9 (in this embodiment 3500 rpm), and the self-priming pump 1 starts pumping operation at the rated rotation speed. In addition,
In this embodiment, a case has been described in which the self-priming rotation speed switching time setting section 23 has four setting values and the self-priming rotation speed setting section 10 has three setting values. The number does not need to be the above number. Also, in this embodiment, the rotation speed during self:i operation is controlled by the setting value between the self-priming rotation speed setting parts and the setting value of the self-priming rotation speed. As explained above, it is needless to say that it is not necessarily necessary to control using the above parameters, and for example, it may be controlled using the set value of the self-priming rotation speed at the start of the operating amount and the set value of the increment of the rotation speed per unit time. stomach.

Next, a fifth embodiment of the present invention will be described.

The basic configuration of the self-priming pump device in the fifth embodiment is the same as that in the first embodiment shown in FIG. 1, but the configuration of the control circuit 3 is different from that in the first embodiment. There is. FIG. 8 is a diagram showing the configuration of the control circuit 3 in the fifth embodiment. In FIG. 8, as in the case of the fourth embodiment shown in FIG. 7, 6 is a motor drive circuit, R is a rotation speed control circuit, 8 is a rotation speed command signal, 9 is a rated rotation speed setting section, 1
o is self-priming rotation speed setting part, 11 is operation command input terminal, 12
22 is a driving command signal, and 22 is a rotation speed calculation circuit. A suction pressure detection means 26 is installed at the suction port 4 of the self-priming pump 1 and outputs a suction pressure signal 27 to the rotation speed control circuit 7. The rotation speed control circuit 7 includes:
A suction pressure setting section 28 is formed, and the rotation speed calculation circuit 22 outputs information set by the self-priming rotation speed setting section 1o and the suction pressure setting section 28 and the suction pressure detection means 26. From the suction pressure signal 27, the self-priming rotation speed is calculated from moment to moment.

The operation of the fifth embodiment will be explained below. In the sixth embodiment, the self-priming rotation speed setting section 10 and r3il
The suction pressure setting section 28 is set to the previously measured and known values shown in Table 2, and the self-priming rotation speed is set to gradually increase as the suction pressure decreases. has been done.

When the operation command signal 12 is input from the operation command input terminal 11 listed in Table 2 i'iJ to the rotation speed control circuit 7, the rotation speed calculation circuit 22 of the rotation speed control circuit 7 calculates the self-priming rotation speed. The first setting value of the number setting section 1o (in this example, 2000
rpm) and outputs the rotation speed command signal 8 so that the electric motor 2 rotates at the first set value.

As the self-priming operation progresses (the suction pressure decreases), the suction pressure signal 27 changes to the first setting value (-0, 1 in this embodiment).
ky/cm ), the rotation speed control circuit 7
The rotation speed calculation circuit 22 of the self-priming rotation speed setting section 1
0 (in this embodiment, 2500 rpm) is selected, and the rotation speed command signal 8 is outputted so that the electric motor 2 rotates at the second set value n'U. 1 more
31, the suction pressure signal 27 is the second setting value C of the suction pressure setting section 28 (-0, 2#/crIt) in this embodiment)
When it becomes equal to
tilb41 is done. And the suction pressure signal 27 is
When the third set value of the suction pressure setting unit 28 (in this embodiment -0, 6) becomes equal to the number of rotations outputted to the drive circuit 6, The command signal 8 is switched from the third setting value set by the self-priming rotation speed setting section 1o to the value set by the rated rotation speed setting section 9 (3500 rpm in this embodiment), and the self-priming rotation speed is The pump 1 starts pumping operation at the rated rotation speed.In this embodiment, the case where there are three setting values of the suction pressure setting section 28 and three setting values of the self-priming rotation speed setting section 10 has been described. However, the number of the above set values is not necessarily the same as the above fl.
It does not have to be a lil number. Furthermore, in this embodiment, a case has been described in which the rotation speed during self-priming operation is controlled using the set value of the suction pressure and the set value of the self-priming rotation speed, but it is not necessarily necessary to control the rotation speed using the above parameters. For example, it goes without saying that control may be performed using a set value for the self-priming rotation speed at the start of operation and a set value for the rate of decrease in suction pressure.

FIG. 9 shows the fourth embodiment of the present invention. The self-priming characteristics of the self-priming pump device of the fifth embodiment are shown. In FIG. 9, a solid line 29 indicates the self-priming characteristic of the self-priming pump of the present invention, and a broken line 30 indicates the self-priming characteristic of the conventional self-priming pump (see FIG. 10).

Effects of the Invention As described above, according to the first aspect of the present invention, the rotational speed of the electric motor that drives the self-priming pump is lower than the rated rotational speed when starting the self-priming pump. By controlling the rotation speed, the self-priming performance of the self-priming pump device can be improved, and the effect is great.

According to the second aspect of the present invention, the rotation speed of the electric motor that drives the self-priming pump is controlled to be lower than the rated rotation speed when starting the self-priming pump, and gradually the rotation speed is rated at the rated speed. By increasing the rotational speed, it is possible to further improve the self-priming performance of the self-priming pump device, and the effect is enormous.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a self-priming pump device in a first embodiment of the present invention, FIG. 2 is a control circuit diagram in the first embodiment of the present invention, and FIG. 3 is a control circuit diagram in a second embodiment of the present invention. #Circuit diagram, Figure 4 is a diagram showing the motor current in the second embodiment,
FIG. 6 is a control circuit diagram in a third embodiment of the present invention;
The figures are self-priming characteristics diagrams of the self-priming pump devices of the first to third embodiments, FIG. 7 is a control circuit diagram of the fourth embodiment of the present invention, and FIG. 8 is a control circuit diagram of the sixth embodiment of the present invention. The control circuit diagram, Fig. 9, is shown in Fig. 4. Self-priming characteristic diagram of the self-priming pump device of the 6th alternating example,
Figure 10 is a self-priming characteristic diagram of a conventional self-priming pump device.
FIG. 1 is a self-priming characteristic diagram when the driving rotation speed of a conventional self-priming pump device d is varied. 1... Self-priming pump, 2... Electric motor, 3... Control circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
11th 5th (4) Figure 2 Figure 4 Figure 5 Figure 6 Time 75 C Second Figure 7 Figure 8 9ri4 Saki En (t) Figure 1O ■ Filter? r: Ir/G

Claims (2)

[Claims] (1) A self-priming pump driven by an electric motor,
A self-priming pump device comprising: a control circuit that controls the rotation speed of the motor to a rotation speed lower than a rated rotation speed when starting the self-priming pump. (2) A self-priming pump driven by an electric motor,
A self-priming pump device comprising: a control circuit that controls the rotation speed of the motor to be lower than the rated rotation speed when starting the self-priming pump, and gradually increases the rotation speed to the rated rotation speed.