JPH0657900U - Liquid transfer device - Google Patents

Abstract

(57) [Summary] [Purpose] The piping can be simplified and the construction cost does not increase, and even under the condition of using a small amount of water, the pump can be stopped without stopping the pump as long as the liquid needs to be sent. The pump is stopped only when not required, and the frequency of switching ON / OFF operations is reduced to provide a liquid delivery device that is advantageous for maintenance. [Structure] A start command for the pump 3 is detected by a pressure detector 15 installed in a pipe line 4b from the pump discharge port 3b to the discharge portion 11.
The stop command of the pump 3 is issued by the reed switch 7 in the flow chamber 1 provided in the pipe line 4a communicating from the liquid supply source 2 to the pump suction port 3a.

Description

[Detailed description of the device]

[0001]

[Technical Field of Device]

 The present invention relates to a liquid delivery device.

[0002]

[Prior art and its problems]

 As shown in FIG. 7, a check valve 9'is provided in the pipe line 4'a from the liquid supply source 2'to the pump suction port 3'a, and a valve 12 'is provided from the pump discharge port 3'b. A liquid delivery device in which a flow switch 1'is provided in a pipe line 4'b leading to the discharge part 11 'is publicly known. However, it is known that a flow switch 1'is provided in the discharge side pipeline 4'b and a check valve 9'made separately from the flow switch 1'is provided in the suction side pipeline 4'a. However, the liquid delivery device has a drawback in that the piping is complicated and the construction cost is high.

Further, there is also a system in which a pressure switch 15 'as shown in FIG. 8 is used in place of the flow switch 1'in FIG. 7, and ON / OFF control of the pump 3'is performed only by this pressure switch 15'. It is publicly known and used. However, in this method, the pressure switch 15 'detects the high pressure set value in the water supply pipe 4'b and stops the pump 3'under a condition of using a small amount of water, but since the valve 12' is opened, the water supply pipe 4'b is opened. The pressure in 4'b is lowered to drive the pump 3 ', and this ON-OFF operation is frequently repeated, which is not preferable for maintenance. Besides, as in the case of FIG. 7, there is a drawback that the piping becomes complicated and the construction cost increases.

[0004]

[The purpose of the device]

 The first object of the present invention is to simplify the piping and increase the construction cost because it is not necessary to separately install a flow switch and a check valve separately formed in the piping path as in the conventional case. It is to provide a liquid delivery device that does not.

Further, the second object of the present invention is that the pump does not stop even under the condition of using a small amount of water as long as liquid transfer is required, and the pump is pumped only when liquid transfer is not required. It is to provide a liquid delivery device that is preferable for maintenance by stopping the operation and reducing the frequency of ON-OFF operation switching.

[0006]

[Constitution of device]

 In the liquid delivery device according to the present invention, a distribution chamber having an inflow port connected to the liquid supply source and a delivery port connected to the pump suction port side in a pipe path leading from the liquid supply source to the pump suction port. A reed switch that opens and closes due to a change in magnetic action caused by the approach and separation of the switch actuating element, and the lower part of the lifting body that supports the switch actuating element above the inlet opening. A plug body facing the edge is attached and detached, and an accumulator and a pressure switch are installed in the pipeline that leads from the pump discharge port to the discharge section described below. A valve is attached to the discharge section, and the pressure switch detects the pressure drop in the pipe line due to the opening operation of the valve to drive the pump, and the pump is driven by the fluid pressure from the inlet port. On body and lift By operation, a flow passage from the inlet to the outlet is formed in the flow chamber, and the reed switch is opened / closed by the approach / separation of the switch actuating element to continue the pump drive. When the lifting and lowering body and the plug are lowered, the upper edge of the opening of the inflow port is closed and the connection with the delivery port is cut off, and the reed switch is opened and closed by the approach and separation of the switch operating element to drive the pump. It is configured to stop.

[0007]

【Example】

 Explaining the drawings of the embodiments below, 1 is a flow chamber interposed in a pipe line 4a leading from the liquid supply source 2 to the pump suction port 3a, and is connected to the liquid supply source 2 side below. It has an inflow port 5 and a delivery port 6 which is connected to the pump suction port 3a side in the upper part. Reference numeral 7 is a lead switch mounted in the flow chamber 1 by a switch holding pipe 17, and 8 is an elevating body that moves up and down in the flow chamber 1, and its lower end is separated from the upper edge 5e of the opening of the inflow port 5. A plug body 9 is provided so as to project in a freely contactable manner. Reference numeral 10 denotes a reed switch actuating element attached to the ascending / descending body 8. As the actuating element 10, for example, a magnet is used as shown in FIGS. 2, 4 and 5, and the lead switch 7 is brought close to the actuating element. The reed switch 7 is released and returned by closing and separating it, or as shown in FIG. 3, the movable magnetic cylinder is used to move the actuating element 10 from the fixed magnet M arranged near the reed switch 7. The reed switch 7 may be closed and released when the reed switch 7 is approached to release and return the reed switch 7. Alternatively, as shown in FIG. 6, the reed switch 7 is normally closed by disposing the fixed magnet M, and the reed switch 7 is released and separated by the approach of the actuating element 10 by the movable magnetic cylinder, so that the reed switch 7 is separated. The configuration may be such that closing and returning are performed. Reference numeral 4b is a pipe passage leading from the pump discharge port 3b to the discharge portion 11 described later, 13 is a priming tank attached in the pipe passage 4b, 13 is an accumulator, and 15 is a pressure switch. Reference numeral 11 denotes a plurality of discharge portions that are led out in a branched manner from the guide portion 4c of the pipe line 4b. Each discharge portion 11 is provided with a valve 12 so that it can be opened and closed. When the pressure in the water supply conduit 4b reaches a set value of low pressure, the pressure switch 15 issues a pump start command and the pump stop command is issued by the reed switch 7 in the flow chamber 1.

In the above-mentioned configuration, when the valve 12 is opened, the pressure in the water supply pipe line 4b decreases, and when the pressure switch 15 detects this and the pump 3 starts up, the fluid pressure from the inflow port 5 causes A water passage 16 from the inlet 5 to the outlet 6 is formed in the flow chamber 1 by the upward movement of the plug 9 and the lifting body 8, and the reed switch 7 is opened / closed by the contact / separation of the switch operating element 10 to pump the pump. Since the ON state of the drive circuit of No. 3 is maintained, the liquid feeding work is continued as long as the valve 12 is opened even under the condition of using a small amount of water. When the fluid pressure from the inflow port 5 disappears due to the closing operation of the valve 12 and the lifting body 8 and the plug body 9 descend, the upper edge of the opening of the inflow port 5 is closed and the electrical connection with the delivery port 6 is cut off. The drive circuit of the pump 3 becomes OF F by the opening and closing operation of the reed switch 7 due to the approach and separation of the switch actuating element 10 while leaning.

[0009]

According to the liquid delivery device of the present invention, the inside of the flow chamber 1 interposed in the pipe line 4a leading from the liquid supply source 2 to the pump suction port 3a has both a flow switch function and a check valve function. The structure is simple, and it is not necessary to separately install a flow switch and a check valve, which were separately constructed as in the past, in the pipe line, and the piping can be simplified. There is an advantage that the construction cost does not increase.

Further, unlike the conventional one in which the ON-OFF control of the pump is performed only by the pressure switch, in the device of the present invention, the start command for the pump 3 is issued from the pressure switch 15, and the stop command is issued in the flow chamber 1. Since the reed switch 7 detects that there is no water flow, the pump does not stop as long as liquid feed is needed even under the condition of using a small amount of water, and only when liquid feed is not needed. The pump can be stopped and the frequency of ON / OFF switching can be reduced, which is advantageous for maintenance.

[Brief description of drawings]

FIG. 1 is a piping system diagram of the liquid delivery device of the present invention.

FIG. 2 is a vertical cross-sectional side view illustrating the structure of the inside of the flow chamber of the liquid delivery device of the present invention.

FIG. 3 is a vertical sectional side view illustrating the structure of the inside of the flow chamber of the liquid delivery device of the present invention.

FIG. 4 is a vertical sectional side view illustrating the structure of the inside of the flow chamber of the liquid delivery device of the present invention.

FIG. 5 is a vertical cross-sectional side view illustrating the structure of the inside of the flow chamber of the liquid delivery device of the present invention.

FIG. 6 is a vertical cross-sectional side view illustrating the structure of the inside of the flow chamber in the liquid delivery device of the present invention.

FIG. 7 is a piping system diagram of a conventional liquid delivery device,
An example is shown in which the ON / OFF control of the pump is performed by the flow switch installed in the discharge side pipeline.

FIG. 8 is a piping system diagram of a conventional liquid delivery device,
An example is shown in which ON / OFF control of the pump is performed by a pressure switch installed in the discharge side pipeline.

[Explanation of symbols]

 1 Distribution Room 2 Supply Source 3 Pump 3a Pump Suction Port 3b Pump Discharge Port 4a Suction Side Pipeline 4b Discharge Side Pipeline 4c Lead Extension 5 Inlet 5e Opening Upper Edge 6 Outlet 7 Reed Switch 8 Elevator 9 Plug Body 10 Switch operating element 11 Discharge part 12 Valve 14 Accumulator 15 Pressure switch

Claims (1)

[Scope of utility model registration request] In the pipeline (4a) leading from the liquid supply source (2) to the pump suction port (3a), the inlet (5) connected to the liquid supply source (2) and the pump suction port (3a) side are connected. A reed switch (7) which is opened and closed by a change in magnetic action due to the approach and separation of the switch actuating element (10) is interposed in the flow chamber (1) having a delivery port (6). A stopper (9) is attached to the lower part of the elevating body (8) for accommodating and supporting the switch actuating element (10) so as to freely contact with and separate from the upper edge (5e) of the opening of the inflow port (5). Then
An accumulator (14) and a pressure switch (15) are provided in a pipeline (4b) leading from a pump discharge port (3b) to a discharge part (11) described later, and the pipeline (4)
A valve (12) is attached to the discharge part (11) led out from the guide part (4c) of (b), and a pressure switch () is provided for reducing the pressure in the pipe line (4b) accompanying the opening operation of the valve (12). 1
5) detects and drives the pump (3), and the fluid pressure from the inflow port (5) accompanying the driving of the pump (3) causes the plug body (9) and the lifting body (8) to move up (5)
The flow passage (16) from the discharge port (6) to the distribution chamber (1)
The reed switch (7) is opened and closed by the switch actuating element (10) which is formed inside the pump (3) to continue the drive of the valve (12) and the fluid pressure of When the lifting body (8) and the stopper body (9) descend due to the decrease, the upper edge (5) of the opening of the inflow port (5)
e) is closed so that the electrical connection with the delivery port (6) is cut off and the drive of the pump (3) is stopped by the opening / closing operation of the reed switch (7) due to the approach and separation of the switch operating element (10). A liquid delivery device characterized by the above.