JPS63117197A - Pump device - Google Patents

Abstract

PURPOSE:To dissolve the erroneous detection of flow rate by installing an obstacle having the flow rate detecting means for a pump which is installed inside a discharge side pipe and a photosensor consisting of a luminous element and a light receiving element in pairs which are installed for allowing the sensor light to pass in the vicinity of the obstacle. CONSTITUTION:A pump motor is ON/OFF-controlled on the basis of the outputs of a flow rate detecting means 7 and a pressure sensor 6. The flow rate detecting means 7 consists of an obstruction body 32 installed in a discharge control pipe 5 and a photosensor 36 consisting of a luminous element 34 and a light receiving element 35 in pairs which are installed for the passing of the sensor light 33 in the vicinity of the obstruction body 32. Therefore, the mechanical constitution such as resistor valve and diaphragm can be removed, and certain detection of flow rate is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a pump device that controls a pump motor on and off based on the output of a flow rate detection means.

(b) Prior art In the conventional technology described in Japanese Patent Publication No. 61-28839, which precedes the present invention, a flow rate detection means is provided in the discharge side piping of the pump body. Since the configuration is such that a resistance valve is interposed in the discharge side piping, and the pressure difference before and after the valve is mechanically detected via a diaphragm and various levers, the resistance loss increases by the amount of the resistance valve, and the pump load increases. There is an increasing drawback that detection errors occur due to the above-mentioned aIII structure.

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks, reduces resistance loss in the piping, and eliminates errors in flow rate detection.

(d) Means for Solving the Problems The present invention provides a tM amount detection means and a pressure detection means on the discharge side of the pump body, and controls the pump motor on and off based on the outputs of both the detection means. ii, the detection means includes an obstacle installed in the discharge side piping;
It is equipped with an optical sensor consisting of a pair of light emitting element and light receiving element installed so that sensor light passes near the obstacle.

(E) Function According to the present invention, when there is no water in the discharge side piping, sensor light is exchanged between the pair of light emitting element and light receiving element without any hindrance. When water is flowing through the discharge side piping, the water flow collides with an obstacle and becomes turbulent, so the sensor light is diffusely reflected near this obstacle, reducing the transmittance, and the light-receiving element is no longer able to receive the sensor light. .

(f) Examples Next, one embodiment of the present invention will be described.

In FIG. 1, numeral 1) is a pump main body, which houses a Wesco-type impeller driven by a pump motor (2) (to be described later) in a casing.

(3) is the suction side pipe connected to the pump body (1),
A check valve (4) is provided. (5) is the pump body (
1) is the discharge side pipe connected to (6) is the discharge side pipe (5)
(7) is a flow rate detection means, (8) is a small-capacity pressure tank connected to the discharge side piping (5), and (9) is the tip of the discharge side piping (5). This is a discharge faucet installed in the section.

In FIG. 2, (10) is a control means that controls the pump motor (2) on and off based on the outputs of the flow rate detection means (7) and the pressure sensor (6). (11
) is a determining means for determining the chattering state, and the determination is made based on the outputs of the rain detecting means (6) and (7). (12
) is a means for notifying the chattering state, etc., and the discriminating means (
The notification is made based on the output of 11).

In FIG. 3, (13) is a microphone in which the control means (1o) is programmed, and the terminal (A2)
The switch section (6a) of the pressure sensor (6) is connected to the terminal (G1), and the switch section (7a) of the flow rate detection means (7) is connected to the terminal (G1). (14) is a drive output port (G
Connected to O>. (16) is the control circuit section (1
The phototriac coupled to the photodiode (14) of 5) constitutes the gate circuit of the triac (18) of the switching circuit section (17). (
19) is the DC trIX circuit section, which is a step-down transformer (2o
), a vi current (21), and an RC smoothing circuit (22) to supply voltages of 5 volts and 7 volts to various locations.

(23) is an interrupt signal circuit section which inputs an interrupt signal to a terminal (INT) to interrupt the execution state of the microcomputer (13) at a desired time. (24) is the reseyyh circuit section,
When the pump motor (2) is stopped due to various failures, the pump motor (2) can be started by manually operating the reset button (25). (26a) (26H) (26c) (26d) are photodiodes that constitute the main part of the notification means (12), and are connected to the microcomputer (13) via ports (EO) (El) (E2) (E3). It is connected to the internal lighting circuit section (27). In the notification means (12), the discriminating means (11)
The lighting circuit section (27) selectively lights up each photodiode (26a), (26b), < 26c, and (26d) based on the output of the lighting circuit, and visually displays various pump states depending on the combination of lighting states. For example, in the case of a chattering state, each photodiode (26a) (26b) (26c
) (26d) are displayed in combination as off, on, off, and on, respectively.

Next, the configuration of the control means (10) will be explained.

In FIGS. 4 to 6, (28) is the pump motor (28) that operates based on the output of the control circuit (15), etc.
2) is the drive circuit section. The control circuit section <15) turns on and controls the pump motor (2) based on the outputs of the pressure sensor (6) and the flow rate detection means (7). In the control circuit section (15), the pump motor (2) is operated continuously as shown in FIG. 6(a) when the water amount is 02 or more, and as shown in FIG. 6(b) when the water amount is between Q3 and Q2. As shown, a program is configured to control the pump motor (2) based on the output of the flow rate detection means (7). C
29) includes the flow rate detection means (7) and the pressure sensor (6).
) is the timer circuit section that is directly read. Timer circuit section (
29) is the flow rate non-detection signal (Sl) of the flow rate detection means (7)
The operation is performed based on the predetermined tie °? as shown in FIG. 6(C). - Continues on state for time (Ta). The flow rate detection means (7) is set so as to issue a flow rate non-detection signal when the flow rate becomes smaller than 21/min.

(30) is a detection circuit unit that detects the amount of water used during the timer operation by the timer circuit unit (29), and specifically detects the number of activations of the pump motor (2) within a predetermined time (Ts). When the opening degree of the faucet (9) is small and the amount of water used is small, the off time (T) of the pump motor (2) is
of) becomes longer, the number of activations decreases, and therefore, by detecting this small number of activations, a small flow rate can be indirectly detected. On the other hand, when the faucet (9) is opened widely and uses a large amount of water, the pump motor (2) off time (T
of) becomes shorter, the number of activations increases, and therefore, by detecting this large number of activations, a large flow rate can be indirectly detected. Regarding the detection circuit section (30), there may also be implemented one that indirectly detects the flow rate by detecting the off time (Tof) instead of the number of activations.

(31) compares these with a reference value based on the number of startups or off time (Tof) detected by the detection circuit section (30), and determines the operation mode of the pump motor (2) by the timer circuit section (29). The timer operation and the pressure sensor (
6), the selection circuit section selects between the pressure sensor operation and the pressure sensor operation according to 6).
of) is short, that is, when the amount of water used is large, the timer operation is selected, and conversely, when the number of activations is small and the off time (of) is long, that is, the amount of water used is small, the pressure sensor operation is selected. The selection reference value for the timer operation and the pressure sensor operation is specifically 10 seconds, and when the off time (Tof) is longer than the 10 second reference value, the timer operation is continued, and when it is shorter, the timer operation is continued. ), the mode is switched to pressure sensor operation. Specifically, the on time (Ta) due to the timer operation is set to 15 seconds. This selection circuit section <31) drives the pump motor (2) via the drive circuit section (28) based on the selection result.

The chattering state determining means (11) is configured as shown in FIG. 6(c).
), the off time (Tof) of the pump motor (2) is shorter than the predetermined value (Tb) < 3 seconds) during the timer operation (when the flow rate is below the non-detection point of the flow rate detection means) as shown in FIG. As shown, the program is configured to determine a chattering state when this short off-time (dOf) intermittent operation (CY) is repeated a predetermined number of times (Nt>(10 times) or more).

As shown in FIG. 8, the flow rate detection means (7)
an inner cross-shaped font (32) on the discharge side piping (5);
A pair of light emitting elements (34) and light receiving elements (35) installed so that the sensor light (33) passes near the obstacle (32).
). The obstacle (32) is formed into a rond shape with a corrosion-resistant plain side, and is stretched in the radial direction on the inner circumferential wall of the discharge side pipe (5). Specifically, the optical sensor (36) is configured to detect vertical iJ! with respect to the rod-shaped obstacle (32). Piping at a position on the bisector (
A reflecting plate (37) is provided on the inner wall of the pipe (5), and the light emitting element (34) and the light receiving element (3) are provided at a location 180° apart from the reflecting plate (37) in the inner peripheral direction of the pipe (5).
5) with a mutual interval, the sensor light (
33) is passed 2 UA before and after the obstacle (32) to improve detection accuracy. The light emitting element (34)
As for the light receiving element (35), each of them is formed of a photodiode and a phototransistor, and the respective functional parts are embedded in the discharge side pipe (5) in a ``H'' state within the pipe. Also, a type in which the lead, I! (not shown), which is attached to the inner wall of the discharge f11 piping (5) is led out from the discharge side piping (5), is also implemented.

In the flow rate detection means (7), when almost no water is flowing into the discharge side piping (5), the sensor light (33 ) is given and received and the phototransistor (
35) is turned on and a high level signal is input to the terminal (G1) of the microcomputer 13), and based on this high level signal, the microcomputer (13) can determine that the flow rate is not detected. In addition, when water is flowing at a predetermined flow rate or higher in the discharge side piping (5) as shown in FIG. The transmittance decreases and the phototransistor (35)
cannot receive light and is turned off, and a low level signal is input to the terminal (G1) of the microcomputer (13), and based on this low level signal, the microcomputer (13) determines that the flow rate has been detected.

In the pump device, as shown in FIG. 5, when the amount of water used is greater than Q2, the pump motor (2) can be operated continuously.

If the amount of water used decreases from Q2, the pressure sensor (6
), the operation based on the flow rate is started, and the pump motor (2) is turned on by the pressure sensor (6) and turned off by the flow rate detection means (7).

If the amount of water used decreases from Q3, the flow rate detection means (
The timer circuit (29) is activated based on the flow rate non-detection signal (Sl) of 7), and timer operation is started, and although the pump motor (2) is turned on by the pressure sensor (6), its on time ( Ta) is regulated to a predetermined long time by the timer circuit (29), thus preventing the pump motor (2) from turning on and off frequently.

Furthermore, when the amount of water used decreases from Q4, the off time (Tof) of the pump motor (2) becomes longer and the number of starts increases, and the pressure is adjusted in the selection circuit section (31) based on this off time or the number of starts. The sensor operation is selected, the signal from the timer circuit (29) is stopped, and the on-time of the pump motor (2) is intermittently regulated to be short by the pressure sensor (6).

Therefore, the pump motor (2) stops in a shorter time than in the case of timer operation, and the energization time rate
n+Tof)] to save power consumption.

During the timer operation, the pump motor (2) may be damaged due to a defect in the pressure sensor (7) or the pressure cutter (8).
When the off-time (Tof) of the controller becomes shorter than 3 seconds and the intermittent operation (CY) with this short off-time is repeated 10 times or more, the chattering state is determined by the discriminating means (11) and the notification means <12> will be notified by.

(G) Effects of the Invention Since the present invention is configured as described above, unlike the conventional example, the flow rate detection means can omit mechanical structures such as resistance valves, diaphragms, and various levers, so that the flow rate can be reliably detected without causing failure. can be detected.

Furthermore, since a resistance valve that causes resistance loss can be eliminated, the load on the pump can be reduced by that amount, and operating efficiency can be increased.

[Brief explanation of the drawing]

Figures 1 to 9 show an embodiment of the present invention, with Figure 1 being a hydrographic diagram, Figure 2 being an overall configuration diagram, and Figure 3 being an electrical circuit diagram.
Figure 4 is a configuration diagram of the control means, Figure 5 is a pumping characteristics diagram, and Figure 6 is a diagram of pumping characteristics.
Figures (a), (b), (c), and (d) are explanatory diagrams of each operation of the pump that changes depending on the amount of water used, Figure 7 is an explanatory diagram of pump operation in a chattering state, and Figure 8 is a flow rate detection means. FIG. 9 is an explanatory diagram of the operation of the flow rate detection means. (1) Pump main body, (2) Pump motor, (5) Discharge side piping, (6) Pressure detection means, (7) Flow rate detection means, ( 32)...obstacle,
33)...Sensor light, (34)...Light emitting element, (
35)... Light receiving element, (36)... Light sensor.

Claims (1)

[Scope of Claims] 1) A pump that includes a flow rate detection means and a pressure detection means on the discharge side of the pump body, and controls the pump motor on and off based on the outputs of both of the detection means, wherein the flow rate detection means The means include an obstacle installed inside the discharge side piping,
A pump device comprising: an optical sensor including a pair of light-emitting element and light-receiving element installed so that sensor light passes near the obstacle.