JPS6356436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic electric pump device constructed by combining an electric centrifugal pump and a jet pump.

In recent automatic electric pump devices (hereinafter referred to as pump devices), when the amount of water discharged from the discharge port exceeds a specified amount, the pressure switch is completely insulated from the discharge pressure of the centrifugal pump section, and the pressure The switch is kept in the OFF state and the centrifugal pump section is operated continuously, and when the amount falls below the above specified amount, the pressure switch is opened and closed in direct response to the discharge pressure, and the centrifugal pump section is operated or stopped. In order to maintain the pressure switch in the on state if the pressure exceeds the specified amount, the discharge pressure near the pressure switch connection is reduced to below the pressure switch off pressure, and the pressure is reduced below the specified amount. In some cases, the pressure reducing effect is lost and the pressure switch is opened and closed in direct response to the discharge pressure.
All of these devices are equipped with a valve device on the discharge side of the centrifugal pump in order to detect the discharge amount of the centrifugal pump section, and the valve device adjusts the frequency of opening and closing of the pressure switch that occurs when the discharge amount is small. In order to prevent the pump from increasing, the above-mentioned switching operation is performed so that the pump device continues to operate even when the discharge amount is small. For this reason, the valve device must be constructed with high precision to the extent that it can sense when the discharge rate has reached a small amount, for example, 1 to 2 per minute, but as mentioned above, the pressure switch must be insulated from the discharge pressure. In the case of pumps with a similar structure or structures that reduce the discharge pressure near the pressure switch connection, a special valve device must generally be used, which not only has the drawback of making the pump device expensive; Since the valve device is provided on the discharge side of the centrifugal pump section, which has a large effect on the external dimensions of the pump device, the pump device has the drawback of becoming large.

The present invention has been made in view of the above-mentioned conventional circumstances, and it is an object of the present invention to provide an automatic electric pump device that is inexpensive and compact.

An electric centrifugal pump disposed with the suction side facing upward, and a jet body having a discharge side communicating with the suction side of the electric centrifugal pump and vertically disposed with the suction side facing upward, A bypass passage is formed perpendicularly to the jet body, with the discharge side facing the suction side of the pump, and can communicate the suction side and the discharge side of the jet body, and an inward flange shape is provided on the inner periphery of the suction side of the bypass passage. The valve seat is arranged vertically so as to be vertically movable, with a space formed between the valve seat formed around the entire circumference and the inner periphery of the bypass passage, and can move up and down according to the pressure difference between the suction side and the discharge side of the jet body. A cylindrical diffuser to be obtained, and a valve portion formed all around the suction side of the diffuser facing the suction side end face of the valve seat and capable of opening and closing the bypass passage by coming into contact with and separating from the valve seat. The present invention provides an automatic electric pump device that is inexpensive and compact, and a second aspect of the present invention provides an automatic pump device that can arbitrarily select the value of the flow rate _Q1 . .

An embodiment of the present invention will be described below with reference to FIGS. 1 to 2.
This will be explained according to the diagram. Note that FIG. 1 is a sectional view showing the configuration of this embodiment, and FIG. 2 is a characteristic diagram showing the pump characteristics of this embodiment. In the figure,
Reference numeral 1 designates a well-known electric centrifugal pump, which is horizontally arranged and has a suction chamber 11 that opens upward, a discharge port 12 that opens radially, and a circulation port 13 that opens upward separately from the suction chamber 11. ing. Reference numeral 2 denotes a jet body vertically connected to the electric centrifugal pump (hereinafter referred to as the centrifugal pump) 1, with a suction port 21 located above and communicating with the water, and a discharge side facing the suction chamber 11. A vertical communication port 22 is opened and communicates with the suction chamber 11 and the suction side communicates with the suction port 21, and an inward flange-like shape is formed on the entire inner circumference of the communication port 22 on the suction port 21 side. The valve seat 23 has a seat surface 23a on the side opposite to the suction port 21, and a pressure water passage 24 that communicates with the circulation port 13 and opens at the center of the suction port 21. Further, on the inner periphery of the communication port 22, a sliding portion 25 of a differential user 4, which will be described later, and a threaded portion 26 of a stopper 6, which will be described later, are formed. 3 is a nozzle that is screwed onto the opening 27 of the pressure waterway 24 and has a discharge outlet at the bottom; 4 is this nozzle 3;
The diff user is disposed concentrically within the communication port 22 and vertically arranged with its discharge side located within the suction chamber 11, and the sliding movement is caused by the pressure difference between the suction chamber 11 and the suction port 21. It is configured to move along the section 25. Reference numeral 41 denotes an outward flange portion formed on the suction side outer peripheral portion of the differential user 4 with a predetermined gap from the sliding portion 25, and having a valve portion 41a facing the seat surface 23a of the valve seat 23. When the centrifugal pump 1 is stopped, the valve portion 41a is separated from the seat surface 23a of the valve seat 23. Reference numeral 42 denotes a plurality of guide portions which extend toward the suction chamber 11 continuously from the flange portion 41 and are formed in a circumferential direction, and guide the differential user 4 into the sliding portion when the differential user 4 moves up and down. This is for guiding the user to move up and down along 25.
Reference numeral 43 denotes a reduced portion formed on the inner periphery of the suction side of the differential user 4, 44 a throat portion continuous to the reduced portion 43, and 45 continuous to the throat portion 44 toward the centrifugal pump 1 side. This is an enlarged portion that is gradually enlarged. Note that the throat portion 44 and the enlarged portion 45 are formed to have an optimum flow path cross-sectional area. Further, an appropriate gap 28 is formed between the outer periphery of the reduced portion 43 and the inner periphery of the valve seat 23, and furthermore, an appropriate gap 28 is formed between the outer periphery of the flange portion 41 and the inner periphery of the sliding portion 25. An appropriate gap 29 is constructed between the two. In addition, the differential user 4 has a specified amount (1 to 2
/ minute).
1 and the suction port 21, the diff user 4 is configured to be able to easily move toward the suction port 21, that is, downward. Reference numeral 6 denotes a stopper that is screwed onto the threaded portion 26 of the jet main body 2 and restricts the axial movement of the differential user 4 within a predetermined range. Note that there is a suitable distance between the inner periphery of the stopper 6 and the outer periphery of the differential user 4.
A gap 61 is configured. Reference numeral 7 denotes a bypass passage formed by the communication passage 22, the inner periphery of the valve seat 23, and the inner periphery of the stopper 6. Also, between 28, 29, 6 above
1, and the outer periphery of the differential user 4 and the sliding portion 2
5 and the inner circumference of the centrifugal pump 1 when the discharge amount from the discharge port 12 is equal to or more than the specified amount.
The suction port 21 communicates with the suction chamber 11 both when the suction port 21 and the suction chamber 11 are stopped. Reference numeral 8 indicates a gasket that provides a watertight connection between the centrifugal pump 1 and the jet main body 2, and 9 indicates the discharge port 12.
is installed in the centrifugal pump 1 to detect the discharge pressure.
This is a pressure switch for starting or stopping the pump, and the off pressure is set at a pressure higher than the maximum pressure when operating as the centrifugal pump 1, as shown in FIG. Note that the horizontal axis in FIG. 2 is the discharge amount, that is, the flow rate Q, and the vertical axis is the discharge pressure, that is, the head H.

In the device configured as described above, when water is discharged from the discharge port 12 while the centrifugal pump 1 is stopped, the pressure inside the centrifugal pump 1 gradually decreases, and eventually the pressure switch is turned off. 9 is closed and the centrifugal pump 1 is started.

Here, the differential user 4 is forced to the communication port 2 due to its own weight.
2, the flange 41 and the valve seat 23 are separated, and the bypass passage 7 communicates the suction chamber 11 and the suction port 21. Therefore, when a large amount of water is discharged, a well-known jet pump with a bypass passage is effective when such a large amount of water passes through the diffuser 4 that cavitation occurs in the throat portion 44 of the diffuser 4. The water in the suction port 21 is attracted by the negative pressure in the suction chamber 11 and flows into the diffuser 4 and the bypass passage 7.
and is introduced into the suction chamber 11. next,
When the amount of water discharged is small, cavitation does not occur in the throat portion 44, so the enlarged portion 45
The pressurization effect is carried out smoothly, and the suction chamber 11
becomes higher than the pressure at the suction port 21, and part of the water in the suction chamber 11 starts to flow back to the suction port 21 via the bypass passage 7, and the diffuser 4 It tries to move toward the suction port 21 due to the pressure difference. However, the differential user 4 is urged toward the suction chamber 11 by its own weight,
Since its own weight is greater than the pressure difference, movement of the differential user 4 is prevented. Therefore, the bypass passage 7 is maintained in a state in which the suction chamber 11 and the suction port 21 are communicated with each other, and a portion of the water in the suction chamber 11 continues to flow backward due to the pressure difference, and the pump action in the jet body 2 is disabled. Since this is not carried out, the pump device is operated by the centrifugal pump 1 alone. By the way, the off pressure of the pressure switch 9 is set to a higher pressure than the maximum pressure of the centrifugal pump 1, so when the pump device is operated by the centrifugal pump 1 alone as described above, the pressure switch 9 9 will be continuously operated in the on state. On the other hand, the amount of water discharged is extremely small (for example, 1 to 2
/min) or when the discharge amount is zero, the pressure increasing effect of the diff user 4 is extremely improved, and the pressure in the suction chamber 11 becomes greater than the pressure in the suction port 21, and the pressure difference causes the water in the suction chamber 11 to increase. At the same time as a large amount of backflow flows through the bypass passage 7, the diff user 4 resists its own weight and closes the suction port 2.
1 side, that is, upward, and finally the valve seat 23
The collar portion 41 comes into contact with the seat surface of the seat. Therefore, it goes without saying that backflow of water is prevented, but the discharge port 12
The pressure increases due to the cooperative action of the centrifugal pump 1 and the diffuser 4, and becomes extremely high. Therefore, the pressure at the discharge port 12 reaches the off pressure of the pressure switch 9, the pressure switch 9 is turned off, and the centrifugal pump 1 is stopped. In addition, if it stops,
Since the pressure difference between the suction chamber 11 and the suction port 21 naturally disappears, the diffuser 4 moves toward the suction chamber 11 again by its own weight, and it goes without saying that the bypass passage 7 returns to the communicating state. Incidentally, the pump characteristic curve in the pump device having the above configuration is the curve shown by the solid line in FIG. That is,
When the bypass passage 7 is in communication, there is no pumping action within the jet body 1, so the centrifugal pump 1 is operated independently. Therefore, the discharge amount,
In other words, when the flow rate is in the range of Q ₁ to Q ₂ , the centrifugal pump 1
Individual characteristics C to D are obtained. For this reason, the discharge port 12
Since the pressure does not reach the off pressure of the pressure switch 9, the centrifugal pump 1 continues to operate.
However, when going below _Q1 , the pressure in the suction chamber 11 becomes much higher than the pressure in the suction port 21, so
The bypass passage 7 is closed, and the pump characteristics of the pump device rapidly improve due to the cooperation between the centrifugal pump 1 and the diffuser 4, resulting in a change from C to B, and the discharge pressure at that time exceeds the off pressure of the pressure switch 9. , the centrifugal pump 1 will stop. in this case,
Since the water is being discharged from the discharge port 12, the discharge pressure eventually decreases to below the ON pressure of the pressure switch 9, and the pressure switch 9 is closed again and the centrifugal pump 1 is operated.

In this way, the pressure switch 9 repeats the opening and closing operations in the range of Q ₀ to _{Q 1} , but in the pump device with the above configuration, the differential user 4 is urged toward the suction side by its own weight, so that By appropriately selecting the self-weight, the flow rate of _Q1 can be easily set to a value of about 1 to 2/min, which is the same as before, and even in the case of such a very small discharge volume, a centrifugal pump can be used. 1 will be operated continuously.
It should be noted that the pump device having the above configuration has a differential user 4.
Since the stopper 6 for regulating the axial movement dimension of the differential user 4 is screwed onto the threaded portion 26, rotating the stopper 6 causes the differential user 4 to move forward or backward together with the stopper 6, thereby changing the amount of downward movement of the differential user 4. can be adjusted appropriately, and the flow rate can be adjusted even at the installation site.
It has an incidental effect that allows the value of Q ₁ to be set arbitrarily.

As described above, the present invention includes an electric centrifugal pump arranged with the suction side facing upward, and a jet body whose discharge side communicates with the suction side of the electric centrifugal pump and which is arranged vertically with the suction side upward. a bypass passage formed perpendicularly to the jet body with the discharge side facing the suction side of the electric centrifugal pump and capable of communicating the suction side and the discharge side of the jet body; a suction side of the bypass passage; The valve seat is formed around the entire circumference in the shape of an inward flange on the inner periphery, and is arranged vertically so as to be vertically movable, with a space between it and the inner periphery of the bypass passage. A cylindrical diffuser that can move up and down depending on the pressure difference, and is formed all around the suction side of the diffuser facing the suction side end face of the valve seat, and opens and closes the bypass passage by coming into contact with and separating from the valve seat. Since it is equipped with a valve part that can be used, it not only has the effect of making the pump device much cheaper compared to the conventional one that uses a special valve device, but also allows it to be installed in the jet body or diffuser, which has almost no effect on the external dimensions. Since the valve device is disposed in the bypass passage, the pump device can be made much smaller and more compact than a conventional pump device in which a valve device is provided on the discharge side of a centrifugal pump.

Moreover, since the differential user itself is displaced by its own weight and is used as a valve device, there is no need for means for urging the differential user, resulting in an extremely simple configuration. In addition, in the case where a screw member is provided to restrict the amount of downward movement of the differential user, the amount of movement of the differential user can be freely set, and the value of the flow rate _Q1 can be arbitrarily selected.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the invention, and FIG. 2 is a characteristic diagram showing a pump characteristic curve of the invention. In the figure, 1 is a centrifugal pump, 2 is a jet body, 23 is a valve seat, 23a is a seat surface, 4 is a diffuser, 41 is a flange, 41a is a valve part, 6 is a stopper, 7 is a bypass passage, 11 is a suction The chamber 21 is a suction port. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An electric centrifugal pump arranged with the suction side facing upward, and a jet main body, the discharge side communicating with the suction side of the electric centrifugal pump, and vertically arranged with the suction side facing upward. A bypass passageway formed perpendicularly to the jet body with the discharge side facing the suction side of the electric centrifugal pump, and capable of communicating the suction side and the discharge side of the jet body;
A valve seat is formed on the inner periphery of the suction side of the bypass passage in the form of an inward flange and is vertically arranged with a space between it and the inner periphery of the bypass passage so as to be able to move up and down. A cylindrical diffuser that can move up and down depending on the pressure difference between the side and the discharge side, and a cylindrical diffuser that is formed all around the suction side of the diffuser facing the suction side end surface of the valve seat, and that is in contact with and separates from the valve seat. An automatic electric pump device comprising a valve section that can open and close the bypass passage. 2. An electric centrifugal pump arranged with the suction side facing upward, and a jet body whose discharge side communicates with the suction side of the electric centrifugal pump and which is vertically arranged with the suction side upward. a bypass passage formed perpendicularly to the jet body, with the discharge side facing the suction side of the volume pump, and capable of communicating the suction side and the discharge side of the jet body;
A valve seat is formed on the inner periphery of the suction side of the bypass passage in the form of an inward flange and is vertically arranged with a space between it and the inner periphery of the bypass passage so as to be able to move up and down. A cylindrical diffuser that can move up and down depending on the pressure difference between the side and the discharge side, and is formed all around the suction side of this diffuser facing the suction side end surface of the valve seat, and when it comes into contact with and separates from the valve seat. An automatic electric pump device comprising: a valve portion that can open and close the bypass passage; and a screwing member that is screwed into the bypass passage and regulates the amount of downward movement of the differential user according to the amount of screwing.