JPS6318197A - Pump controller - Google Patents

Abstract

PURPOSE:To set a freeze proofing current value automatically, by storing an on-off cycle ratio just before the operating point in a memory on the basis of the on-off cycle ratio feeding power to a pump motor and output of a flow sensor. CONSTITUTION:Setting an on-off ratio of feed, when a pump motor is rotated at low speed and a flow sensor 8 operates as it detects a flow rate, an on-cycle number (as) is set down to (as-1), storing it in a memory. This on-cycle number (as-1) is one that the flow rate is less than an operating point of the flow sensor 8 and just before this operating point, and it is automatically adjusted in response to capacity of a pump type and thereby it corresponds to a freeze proofing current value. Therefore, this freeze proofing current value is automatically set in conformity with the capacity of the pump type.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention is designed to reduce the amount of water in the pump gauging by controlling the pump motor to generate heat and rotating at low speed by a microcomputer when the temperature drops. The present invention relates to a pump control device that prevents freezing.

(b) Conventional technology In the conventional technology proposed by the present applicant in Japanese Patent Application No. 107307/1983, when the humidity drops, a minute current for anti-freezing is supplied to the pump motor to cause the pump motor to generate heat and rotate at low speed. This prevents the pump from freezing. However, when replacing only the pump section of a pump device with one of a different capacity, the anti-freeze EfI minute current step is applied in accordance with each pump section heat retention device. However, there is an inconvenience in that a new trap must be set by pressing the auxiliary operation switch, and if this setting operation is made incorrectly, the pump may freeze or excessive antifreeze current may be supplied to the pump motor.

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and is configured to automatically set the antifreeze current value of the pump motor in accordance with the capacity of the pump model. be.

B.) Means for solving the gap point The present invention comprises a pump gauging provided with a flow rate sensor on the discharge side, a pump motor provided with good heat transfer to the pump gauging, and a pump gauging provided with a flow rate sensor on the discharge side. ``A temperature sensor installed near the motor, and when the temperature sensor detects a temperature below a predetermined temperature, the pump motor generates heat and rotates at a low speed by supplying power with a constant on/off cycle ratio to perform antifreeze operation. and a microcomputer, the microcomputer stores in a memory the on/off cycle ratio for supplying power to the pump motor, and the on/off cycle ratio immediately before the operating point based on the output of the flow rate sensor. By doing this, you can configure the settings to be set automatically.

(E) Function According to the present invention, when the ambient temperature drops, the condition of the paddy is detected by the temperature sensor, and the pump motor generates heat and rotates at low speed by supplying power with a constant on/off cycle ratio to perform antifreeze operation. Ru. In addition, the on/off cycle ratio of the current supplied to the pump motor can be determined by storing the on/off cycle ratio immediately before the operating point in the memory of the microcontroller using the output of the flow rate sensor installed in the pump. Automatically set according to the capacity of each pump model.

When the flow rate is at the m-ζ production point of the flow sensor, a relatively large current flows in a large-capacity pump and the on/off cycle ratio becomes large, whereas a relatively small current flows in a small-capacity pump. The flow on/off cycle ratio is also smaller, and in this way, the on/off cycle ratio, which differs between large capacity pumps and small capacity pumps, is automatically set in a manner that corresponds to the capacity of each pump model. Embodiment Next, an embodiment of the present invention will be described.

In FIG. 1, reference numeral 11) is a pump main body, which is specifically composed of a pump motor (2) (described later), a pump casing (not shown), etc.
2) The pump gauging and other parts are covered with a storage cover. In addition, the pump motor (2) has good heat transfer through the impeller etc. attached to its rotating shaft.
and is connected to the pump casing. F3) Connected to Vi pump body (1)! Check valve 1 on the intake side piping
41 is interposed. +51 is a low water level detection sensor that detects when the water level is below a predetermined value due to water outage, etc. (6)
is a discharge side pipe connected to the pump body +11, +71 is a pressure sensor provided on the discharge side pipe (6), and (8) is an a quantity sensor. The a quantity sensor 18) is installed in the discharge side piping (6) K near the discharge port of the front pump casing so that the agitation flow of the impeller can be detected even when the discharge faucet (9) is closed. ing.

(1■ is a pressure tank connected to the discharge side piping (6).

In Figure 2, ul is the microcomputer that constitutes the main part of the pump control device, the central control unit uz, the memo 1 month, and this memo;
J11n-*L. The functionality of this microcomputer (11) will be described later.

4 is a power supply circuit section connected to a commercial power supply, and a switching circuit section f16) connected in series to the pump motor (2).
'r have. The switching circuit section db) is formed by a triac (1, etc.), and this triac 1.1
Turn on via phototriac 0Q on the gate side of
It will be turned off.

Reference numeral 119 denotes a control circuit section that sends control signals to the switching circuit section mark, and is connected to the drive output port (G
It has a photodiode CA and is combined with the phototriac q81 of the switching circuit section +161.

121) is a DC power supply circuit section, which includes a step-down transformer (2), a commutator, and an RC smoothing circuit, and supplies voltages of 5 volts and 7 volts to various parts.

■ is an interrupt signal circuit section, which inputs a half-wave rectified current to the input terminal (a) through a step-down transformer ■, and outputs a square wave interrupt signal to the output terminal (b) of the transistor.
During this time, an interrupt signal synchronized with the power supply frequency e and number is sent to the terminal (I
NT) K is being input.

The first unit is a reset circuit unit, which enables the pump motor (2) to be started by manually operating the reset button if the pump motor (2) is stopped due to various failures.

2 is the temperature detection circuit section, which has a temperature sensor ``■'' that detects the ambient temperature of the pump and a comparator ``Ill'', and inputs the temperature signal of temperature sensor 4 to the negative side of the comparator ``Ill'' from the connection with the dividing resistor 6υ. This temperature signal is compared with a reference signal input on the positive side to detect humidity, etc. that requires heat retention.The reference value signal is input from the ladder resistor G2 via the output terminal (a).This temperature detection circuit 8s 1
At step 281, the output capacitors (Do) to (D2) and (D2) are executed in response to the respective temperature reference values stored in the read-only memory (14) of the microcomputer (11).
Temperature data is sequentially output from FO) to (F3) to generate a stepped voltage through the ladder resistor r32, and this stepped voltage as a reference value signal is compared with the voltage corresponding to the ambient temperature of the pump. When the voltage value changes to a small value, the output of the comparator (■) becomes high level, and at the same time, this high level signal is input to the port (A1) of the microcomputer (11), and the microcomputer U detects various temperatures such as the temperature required for keeping warm. do. Specifically, it detects a temperature of 2° C. or lower that requires insulation, or a temperature of 5° C. or higher when returning from anti-freeze operation to normal operation.

Q is an automatic changeover switch section, and the pressure sensor i71
, switch parts (7a) (8a) (5a) corresponding to the flow rate sensor (8) and the low water level sensor 151, respectively.
)have.

t34) is a manual vJS operation changeover switch section, which includes a switch (g) for changing over 50/60H2 of the AC power source, which is operated by the user with assistance.

The microcomputer +11) has a program configured as follows regarding setting of the on/off cycle ratio for supplying power to the pump motor (2) during antifreeze operation.

The microcomputer (11) checks the temperature detected by the temperature sensor in the temperature detection routine as shown in FIG. 2, and if the detected temperature is 2° C. or less, antifreeze operation is started. This anti-freeze operation is started once and continues until the detected temperature rises to 2° C. and rises by 5° C. without stopping even when the temperature returns.

In a pump control device, if only the pump section is replaced with one of a different capacity, in the subsequent anti-freeze operation, it is determined whether the anti-freeze operation is the first operation after the pump section has been replaced. However, when it is the first operation, the setting operation of the power supply on/off ratio corresponding to the replaced pump section is started. First, as a trial, the pump motor (2) is rotated at a low speed by turning on one cycle corresponding to the commercial power frequency and then turning off the next 30 cycles, and the response of the flow rate sensor (8) at that time is monitored. Flow rate sensor (8
) does not reach the operating point, the on-cycle &
(-n) and monitor the flow rate sensor (8).

, 3f, when the quantity sensor (8) detects the flow rate and disconnects it, the number of off cycles (as-1), which is obtained by subtracting one cycle from the on cycle & (aS) at that time, is stored as the appropriate number of on cycles. Store in f13. This number of on-cycles (aS-1) is for the flow rate below the operating point of the flow rate sensor (8), the operating point of the direct outlet rJ, and the water flow noise is below a predetermined value, and the capacity of the giant pump model. It is intended to respond immediately and be proactive in its operation to prevent freezing. In the subsequent antifreeze operation, the on-cycle number (as-t
), the antifreeze current is supplied to the pump motor (2) at predetermined intervals ((a s −1)+50 ).

FIG. 4 shows the antifreeze operation of another embodiment, and in this embodiment, the on/off cycle ratio is set by discontinuing the number of off cycles (An) from 60 cycles, unlike the previous embodiment. Let's do it. Off cycle & (An)
' to produce the flow rate sensor (8),
The off cycle number (As) plus one cycle (As+1) at that time is stored in the memo IJ u3 as an appropriate number of off cycles, and in subsequent anti-freeze operation, on-site &I, off-cycle modification (A s
+1), which supplies antifreeze current to the pump motor (2). In the other embodiments, other parts not particularly described are constructed in the same manner as in the above-mentioned embodiment.

In the pump control device, when the water faucet U is opened and the pressure in the pump main body (1) decreases, the pressure sensor (7) is activated, and based on this, the output port (1) of the microcomputer (1) is activated.
The control circuit q9 of Go) becomes conductive, the power switching circuit qQ turns on, and the pump motor (2) operates.

When the faucet (Ut) is closed and the flow rate disappears, the flow rate sensor (
8) is activated, and based on this, the control circuit section (19) is turned off and the pump motor (2) is also stopped.

When the water level on the suction side decreases, the low water level switch 15
) operates, the $lJ control circuit section (19) becomes non-conductive, and the pump motor (2) becomes unable to start.

Further, in the control device, when the detected temperature drops to 2° C. or less, the predetermined ON 1. An anti-freezing current at an off-cycle ratio is supplied to the pump motor (2), and therefore, the pump device performs anti-freezing operation with an appropriate stirring force and amount of heat using a current corresponding to the capacity of each pump model.

(G) Effects of the Invention Since the present invention is configured as described above, when there is a risk of freezing, the pump motor can be caused to generate heat and rotate at a low speed with a minute anti-freeze current to prevent the pump from freezing. In addition, the anti-freezing current is automatically set according to the configuration of the flow rate sensor and microcomputer to correspond to the eight types of various pump models. This eliminates the inconvenience of setting and the mistakes in setting operations. In addition, the on/off cycle ratio of the antifreeze current can be set by using the flow sensor installed in the pump.
It can be easily carried out without the need for a special configuration, and in a situation where water flow noise is suppressed to a predetermined level or less.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, with Figure 1 being a hydrographic diagram and Figure 2 being an electrical circuit diagram. FIG. 3 is a flowchart for setting the on/off cycle ratio of the antifreeze current. (2)...Pump motor, (8)...Flow rate sensor,
(IX)...Microcomputer, (13...Memory, ■...
-Temperature sensor, (as-t)...Number of on-cycles.

Claims (1)

[Claims] 1) A pump casing provided with a flow rate sensor on the discharge side, a pump motor provided with good heat transfer to the pump casing, a temperature sensor provided near the pump motor, and the temperature sensor. A microcomputer that causes the pump motor to generate heat and rotate at a low speed by supplying power with a constant on/off cycle ratio when a temperature below a predetermined value is detected, thereby causing the pump motor to operate to prevent freezing,
The microcomputer is configured to automatically set an on/off cycle ratio for supplying power to the pump motor by storing in a memory the on/off cycle ratio immediately before the operating point based on the output of the flow rate sensor. A pump control device characterized by: