JPS5843597B2 - Wesco pump control mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control mechanism for a Wesco pump.

Conventionally, Wesco pumps used in wells, etc. have generally been equipped with a pressure tank, and the compressed air pressure inside this pressure tank has been used to operate a pressure switch and automate the pump drive. If the air in the tank becomes low, the pressure switch will have to open and close frequently, which may cause early burnout of the switch or adversely affect the pump and tank. In addition to being necessary, the pressure tank has a large capacity, making it very bulky, making it inconvenient to transport and handle, and requiring a large area to install.

Therefore, in recent years, so-called tankless pumps have been developed that omit the pressure tank and air supply device and can operate the pump in the same way as a pump with a pressure tank.

If the pressure tank is omitted in the Wesco pump, the pressure rises quickly, and even when using a considerably large flow rate, the pressure reaches the OFF point of the pressure switch and the pressure switch repeats opening and closing. For example, in Figure 4, when the flow rate is Q2 When the pressure becomes below, the pressure reaches the OFF point.

Note that if the OFF point is set high so that the pressure switch operates when the flow rate is low, the range of flow rate that can be used with the pressure switch closed can be widened.
As the discharge pressure of the pump increases, the motor becomes overloaded and there is a risk of burnout.

Unless these problems are resolved, the tankless pump will be incomplete.

As a result of various studies in view of the above points, the present invention prevents pressure rise and prevents pump overload by changing the pump capacity according to the amount of water used, and also reduces the pump capacity when using a small amount of water. as pressure switch OFF
It was invented so that the pump can be operated continuously at a pressure below F, and the pressure switch opens and turns OFF only when the amount of water drops below a certain amount, which is equivalent to a leak.In particular, when the amount of water falls below the amount of water that is as small as a leak, the pump shuts off. This restores the capacity to its original level and rapidly increases the pressure, making it possible to reliably open the pressure switch.

That is, the present invention forms a sub-suction port in the middle of the pressurizing waterway from the suction port to the discharge port of the Wesco pump, and connects the suction port and the water suction pipe via the main water suction passage, and also connects the sub-suction port and the water suction pipe. They are connected to each other via an auxiliary water intake passage, and equipped with an auxiliary water intake passage and a check valve.The main water intake passage is once branched into two waterways and then rejoined as a station road. The discharge channel is equipped with a valve mechanism that opens and closes depending on the flow rate, and the other channel is equipped with a valve mechanism that opens and closes depending on the pressure change on the discharge side, and the latter valve mechanism is opened when the pressure on the discharge side is low. The water suction main passage is opened, and as the pressure increases, the water suction main passage is closed and the water suction auxiliary passage is opened to reduce the pump capacity.Furthermore, when the flow rate of the discharge passage is below a certain minimum water volume, the former The valve mechanism is opened to open the water suction main passage and to rapidly increase the discharge pressure.

An example thereof will be explained below using figures.

P is a Wesco pump, 1 is a casing of pump P, 2 is an impeller, 3 is a water suction pipe from a well etc., and 4 is a discharge waterway.

Reference numeral 5 denotes a resistance valve installed at an appropriate location in the discharge waterway 4, so that there is a pressure difference between the upstream and downstream sides of the valve when the flow rate exceeds a certain extremely small amount of water, and there is no pressure difference when the flow rate falls below the above-mentioned certain amount of water. be.

Reference numeral 6 denotes a pressure increasing waterway extending from the suction lower to the discharge port 8, and a sub-suction port is formed in the inside of this pressure increasing waterway 6.

The suction lower and the water suction pipe 3 are connected through a main water suction passage 10, and the sub suction port 9 and the water suction pipe 3 are connected through a water suction auxiliary passage 11, respectively.

Reference numeral 12 designates a check valve provided at the connection portion between the water suction main passage 10 and the water suction pipe 3, and 13 designates a check valve installed near the pressure increasing waterway 6 of the water suction auxiliary passage 11.

The water absorption main passage 10 once passes through two water channels 10a,
It is formed as a station road that branches into 10b and joins again.

The main channel 10a of the station road is equipped with a valve mechanism A that opens and closes depending on the flow rate of the discharge channel 4.

This valve mechanism A has two upper and lower chambers 22a separated by a diaphragm 21a above and outside a valve body 20a in a waterway 10a.

23a, and a valve rod 24a connected to the upper part of the valve body 20a.
is connected to and supported by the diaphragm 21a, and the lower chamber 23
a is equipped with a spring 25a that presses the diaphragm 21a in the valve opening direction of the valve body 20a, and the upper chamber 22a is connected to the upstream side of the resistance valve 5 of the discharge waterway 4, and the lower chamber 23a is connected to the downstream side of the communication pipes 26a and 27a, respectively. The flow rate of the discharge channel 4 is detected by the presence or absence of a differential pressure between the upper and lower two chambers 22a and 23a, and when there is a differential pressure, that is, the flow rate of the discharge channel 4 is below a very small constant water flow. In this case, the valve is closed against the force of the spring 25a, and the valve is set to be opened by the spring 25a when there is no differential pressure, that is, when the flow rate of the discharge channel 4 is below a certain minimum amount of water.

B is a valve mechanism provided in the other waterway 10b of the station road, which opens and closes in response to pressure changes on the discharge side.

That is, this valve mechanism B has two upper and lower chambers 22 which are partitioned by a diaphragm 21b on the outside above a valve body 20b in a waterway 10b.
b, 23b are provided, and a valve rod 24b connected to the upper part of the valve body 20b is connected to and supported by the diaphragm 21b, and a spring is provided in the lower chamber 23b to press the evening diaphragm 21b in the valve opening direction of the valve body 20b. 25b, the upper chamber 22b is connected to the upstream side of the resistance valve 5 of the discharge waterway 4 through a communication pipe 2.6b so that water can flow in, the lower chamber 23b is communicated with the atmosphere, and the pressure in the upper chamber 22b is When the pressure is below the constant pressure P1, the valve is opened by the pressing force of the spring 25b, and when the pressure exceeds the constant pressure 21, the valve is closed against the force of the spring 25b.

Note that the valve mechanism A that opens and closes depending on the flow rate of the discharge channel 4 and the valve mechanism B that opens and closes depending on the pressure change on the discharge side are not limited to those of the above-described embodiments. Is there something that can perform similar opening/closing operations by sensing or by sensing pressure? f! For example, it is possible to use electrical communication means.

In the figure, numeral 30 is a pressure switch, 40 is an accumulator of approximately 1 to R5 compared to a conventional pressure tank, and 50 is a faucet.

Next, the operation of the present invention will be explained using examples.

At the time of startup when the pump P is installed, the pressure switch 30 is in a closed state, so the pump P can be operated just by turning on the power.

When water flows into the discharge channel 4, the upper and lower valve mechanisms 2 of the valve mechanism A
2a, 23a and the upper chamber 22b of the valve mechanism B will also have water flowing into them.

When the faucet 50 is fully opened, the flow rate of the discharge waterway 4 increases, so naturally there is a difference in pressure between the upstream and downstream sides of the resistance valve 5, that is, the upper chamber 22a and the lower chamber 23a that enter the valve mechanism A. This differential pressure pushes the diaphragm 21a in the direction of closing the valve body 20a against the spring 25a.
Valve mechanism A will be closed, but if the flow rate is 01 or more, the pressure on the pump discharge side, that is, the upper chamber 22b of valve mechanism B will be P
Since the pressure is as low as 1 or less, the diaphragm 21b is pushed against the valve body 20b by the pressing force of the spring 25b that resists this pressure.
is pressed and displaced in the valve opening direction to open the valve mechanism B, and water is sucked from the waterway 10b provided with the valve mechanism B in the station road provided in the middle of the main water suction passage 10. .

At this time, in the water suction auxiliary passage 11 connected to the auxiliary suction port 9 of the pressure boosting waterway 6, the pressure rising water channel 6 side of the check valve 13 becomes high pressure and the water suction pipe 3 side becomes low pressure, so the check valve 13 remains closed. Water is sucked only from the water suction main passage 10 connected to the suction lower, and is discharged using the entire length of the pressurizing water channel 6 inside the pump P.

The pressure-flow characteristics at this time are the same as those when only the main water suction passage 10 is opened, as shown in FIG.

Further, the pressure is maintained at the OFF level of the pressure switch 30.

Then, when the faucet 50 is closed and the amount of water used is reduced to below Q1, the discharge pressure becomes above P1, and the upper chamber 22b flows into the valve mechanism B.
The internal pressure also increases, and as the pressure increases, the diaphragm 21b resists the pressing force of the spring 25b and pushes the valve body 2.
Pressed in the valve closing direction of 0b, the valve mechanism B approaches the closed state.

At this time, even if the flow rate of the discharge waterway 4 is small, there is a difference in pressure on the upstream side of the resistance valve 5, and the valve mechanism A will still maintain a closed state.

When water is no longer absorbed from the main water suction passage 10, the pressure on the pressure boosting waterway 6 side of the check valve 13 in the auxiliary tree passage 11 becomes low, and the pressure on the water suction pipe 3 side becomes high, the check valve 13 opens, and water flows from the sub suction port 9. As a result, the pressure boosting waterway 6 becomes shorter and the capacity of the pump P decreases, and the pressure car flow characteristics become 4th.
As shown in the figure, the pressure when only the water suction main passage 10 is opened - From the flow rate characteristics, the pressure when only the water suction auxiliary passage 11 is opened -
Closer to flow characteristics.

Especially when the faucet 50 is mostly closed and the flow rate is extremely low, the constant amount of water Q3
When it approaches , the valve mechanism B is completely closed, water is sucked only from the water suction auxiliary passage 11 connected to the sub-suction port 9, and the pressure boosting waterway 6 is only used for fishing substantially the entire length.
The pump capacity is reduced to about half when the faucet is fully opened, the pressure-flow characteristics match those when only the water suction auxiliary passage 11 is opened, and the discharge pressure is reduced to OFF when the pressure switch 30 is turned OFF.
and the pump P is continuously operated.

Furthermore, when the faucet 50 is closed and the flow rate of the discharge channel 4 is reduced to zero or a constant water amount δ2 that is as small as water leakage, the differential pressure between the upstream side and the downstream side of the low resistance valve 5 disappears, and the upper chamber 22a in the valve mechanism A The differential pressure in the lower chamber 23a disappears, the diaphragm 21a is pressed by the spring 25a in the direction of opening the valve body 20a, the valve mechanism A opens, and the water channel 10a equipped with the valve mechanism A becomes open. , water absorption main passage 1 again
Water is absorbed from zero, and the water absorption auxiliary passage 11 is closed.

Therefore, in an attempt to return the pressure-flow rate characteristic to the Moka flow rate characteristic when only the water suction main passage 10 is opened, the discharge Mocha rises rapidly, and the pressure switch 30 immediately turns OFF, causing the pressure switch 30 to turn OFF. Pump P stops.

During this period, the water leaking level is carried out by the accumulator 40, and when the effective amount of water in the accumulator 40 flows out, the square of the discharge channel 4 decreases, and the pressure switch 30
The pump P is operated until the accumulator 40 is filled with water, and the intermittent operation is repeated.

Of course, if the faucet is completely closed and there is no leakage, the pump P
remains stopped.

As described above, the present invention forms a sub-suction port in the middle of the ascending waterway from the suction port to the discharge port of the Wesco pump, and has a water suction main passage connected to the suction port and a water suction auxiliary passage connected to the sub-suction port. When the faucet is fully opened, the water intake main passage is opened to discharge the rated water with sufficient force, and when the water usage is low, the water intake auxiliary passage is opened and the rising water passage is opened. By shortening the length, it is possible to reduce the pump capacity and prevent an increase in writing force, that is, overload of the pump, allowing stable continuous operation.
Power consumption is also low.

In particular, the present invention has a station path in the middle of the main water absorption passage, one side of the station path is equipped with a valve mechanism A that opens and closes depending on the flow rate of the discharge waterway, and the other side is equipped with a valve mechanism A that opens and closes depending on the flow rate of the discharge channel. Since it is equipped with a valve mechanism B that opens and closes, when the flow rate exceeds a very small constant amount of water, the water absorption main passage and the water absorption auxiliary passage are opened and closed according to changes in the writing force of the valve mechanism B while the valve mechanism A is closed. The pump capacity can be changed reliably by opening and closing, and by setting the gravity-flow rate characteristic when sucking water from the water suction auxiliary passage to the OFF/OFF position of the pressure switch, the discharge writing force can be reliably adjusted to the pressure switch. O
It can be maintained at FFFF, and even if the writing force pulsates, the risk of the pressure switch turning OFF prematurely can be eliminated.

When the flow rate is below a certain minimum amount, the valve mechanism A is opened and water can be sucked from the main suction passage, so the pump's discharge force can be increased rapidly, and the writing force will not exceed OFF due to resistance loss of the pump. There is no possibility that the pressure switch will not work, the pressure switch can be turned off reliably with a margin, and opening/closing operations can be performed with good stability.

Therefore, the present invention prevents overload by reducing the capacity of the pump as the amount of water used decreases. Of course, there is no need to contact the tankless Wesco pump because the pump can be automatically controlled so that it operates continuously when the flow rate exceeds a certain extremely small amount of water, and operates intermittently when the amount of water falls below a certain extremely small amount. It is extremely suitable for use as a control mechanism as it can significantly reduce the frequency of opening and closing of switches.It has a simple structure, can be made compact, and is easy to transport and handle.It also helps to reduce the installation area of the pump, reducing costs. This invention has excellent effects, such as contributing to the reduction of

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is an implicit front view, Fig. 2 is an enlarged sectional view of a valve mechanism that opens and closes depending on the flow rate of the discharge waterway, and Fig. 3 shows the writing force on the discharge side. FIG. 4 is an enlarged cross-sectional view of the valve mechanism that opens and closes as the flow rate changes, and is a diagram of the flow rate characteristic diagram of the container. P... Pump, 3... Water suction pipe, 4...
...Discharge waterway, 5...Resistance valve, 6...
・・Shogan Canal, 7・・Suction port, 8・・・・
Discharge port, 9... Sub-suction port, 10... Water absorption main passage, 11... Water absorption auxiliary passage, 13...
... Check valve, 10a, 10b ... Waterway serving as a station road, A ... Valve mechanism that opens and closes depending on the flow rate of the discharge waterway, B ... Discharge A valve mechanism that opens and closes as the writing force changes.

Claims (1)

[Claims] 1. A sub-suction port 9 is formed in the middle of the pressurizing waterway 6 from the suction lower to the discharge port 8 of the Wesco pump P, and the suction lower and water suction pipe 3 are connected through the water suction main passage 10. In addition, the auxiliary suction port 9 and the water suction pipe 3 are connected through an auxiliary water suction passage 11, and a check valve 13 is installed in the auxiliary water suction passage 11, and the main water suction passage 10 is temporarily connected to two water channels 10a, One waterway 10a is equipped with a valve mechanism A that opens and closes depending on the flow rate of the discharge waterway 4, and the other waterway 10b is equipped with a valve mechanism A that opens and closes depending on the flow rate of the discharge waterway 4. A control mechanism for a Wesco pump, characterized by comprising a valve mechanism B that opens and closes. 2 Valve body 20a provided in waterway 10a as valve mechanism A
Two upper and lower chambers 22a and 23a partitioned by a diaphragm 21a are provided on the upper exterior, and a valve stem 24a at the upper part of the valve body 20a is connected to and supported by the diaphragm 21a.
is equipped with a spring 25a that presses the diaphragm 21a in the valve opening direction of the valve body 20a, and connects the upper chamber 22a to the discharge waterway 4.
The lower chamber 23a is connected to the upstream side of the resistance valve 5 installed in the upper and lower chambers 22a so that water can flow to the downstream side, respectively.
, 23a, the valve is opened against a spring 25a, according to claim 1. 3 Valve body 20b provided in water channel 10b as valve mechanism B
Two upper and lower chambers 22b and 23b partitioned by a diaphragm 21b are provided on the upper exterior, a valve stem 24b connected to the upper part of the valve body 20b is connected to and supported by the diaphragm 21b, and a diaphragm 21b is provided in the lower chamber 23b. The upper chamber 22 is provided with a spring 25b that presses the valve body 20b in the valve opening direction.
b is connected to the upstream side of a resistance valve 5 installed in the discharge waterway 4 so that water can flow in, and when the pressure in the upper chamber 22b exceeds a certain pressure, the valve opens against a spring 25b. A control mechanism for a Wesco pump according to scope 1 or 2.