JPH0422079Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an automatic pressure regulating valve for a jet pump used in an automatically operating pump device for deep wells, etc.

[Technical background of the invention]

A jet pump used in a pump device for deep wells and the like includes a main pump section 1 and a jet pump section 2, as illustrated in FIG. The jet pump section 2 has its discharge side connected to the suction pipe 3 of the main pump section 1, and the jet nozzle 4 is connected to the discharge pipe 6 of the main pump section 1 via a pressure pipe 5. The suction pipe 7 of the jet pump section 2 has one end open facing the nozzle 4 and the other end connected to the foot valve 8. The discharge pipe 6 includes an automatic pressure regulating valve 9 that can control the internal pressure of the pressure pipe 5, a pressure tank 10 such as a bladder type pressure accumulator, and a pressure tank 10 such as a bladder type pressure accumulator.
When the internal pressure of the main pump drops below a predetermined lower limit value, the pressure detection section 11 sends out a signal for starting the main pump section 1, and when the internal flow rate of the discharge pipe 6 drops below a predetermined lower limit value, the main pump A flow rate detection section 12, a water tap 13, etc., which send out a signal for stopping the section 1, are provided. Pressure detection section 11
The output signal of the flow rate detection section 12 is guided to the main pump section 1 via the control section 14.

In this way, continuous operation is possible over a wide range from the maximum flow rate corresponding to the predetermined lower limit value of the above-mentioned pressure to the predetermined lower limit value of the above-mentioned flow rate, and it is possible to avoid frequent starting and stopping during water supply. There is no. Therefore, sudden fluctuations in water supply pressure do not occur, and the capacity of the pressure tank 10 can be reduced.

When the water tap 13 is opened in the automatic operation pump device for deep wells configured as described above, water flows out according to the internal pressure of the pressure tank 10, and when the internal pressure of the discharge pipe 6 falls below a predetermined lower limit value, Pressure detection part 1
The main pump section 1 is activated in response to the output signal No. 1. As a result, the water sucked from the foot valve 8 circulates through the suction pipe 7 → jet pump part 2 → suction pipe 3 → main pump part 1 → discharge pipe 6 → pressure pipe 5 → nozzle 4, and is caused by the jet action in the nozzle 4. It joins the water sucked in from the foot valve 8. In this way, when the internal pressure near the inlet of the pressure pipe 5 exceeds a predetermined set value, the automatic pressure regulating valve 9 is opened.
The pressure of the water flowing into the pressure pipe 5 is maintained within a predetermined range, and a portion of the water discharged from the main pump section 1 flows along the discharge pipe 6 toward the water tap 13. When the amount of water flowing out from the hydrant 13 is larger than the amount flowing out from the automatic pressure regulating valve 9, the water in the pressure tank 10 flows out and the internal pressure decreases, and the amount of water flowing out from the hydrant 13 decreases. Automatic pressure regulating valve 9
If the water discharged from the pump section 1 flows into the pressure tank 10, the pressure inside the pressure tank 10 increases. When the pressure in the pressure tank 10 exceeds a predetermined upper limit value, the discharge amount from the pump section 1 reaches the lower limit value, and the main pump 1 is stopped based on the output signal of the flow rate detection section 12. ing.

[Problems with background technology]

The conventional automatic pressure regulating valve 9 includes an elastic valve body 26 that freely faces a valve seat 23 (see FIG. 1), a spring member 31 that biases the valve body 26 in the closing direction, and a spring member 31 that biases the valve body 26 in the closing direction. It is provided with a screw member 28 etc. for variably setting the urging force of. When adjusting the biasing force of the spring member 31 when installing the pump, priming water is injected into the main pump section 1, suction pipe 3, pressure pipe 5, etc. from an inlet (not shown) formed in the pump section, and then into the inlet. After installing the pressure gauge and screwing in the screw member 28 until its head is covered and closing the automatic pressure regulating valve 9, the main pump section 1 is started, and after a predetermined period of time, the pressure gauge indicates a predetermined pressure. The screwing amount of the screw member was adjusted accordingly. That is, when the pressure gauge indicates a predetermined pressure in relation to the depth of the well, the adjustment of the operation of the automatic pressure regulating valve 9 for the well in which the jet pump is installed is completed. In this state, it can be determined that the screwing amount of the screw member 28 in the automatic pressure regulating valve 9 matches the suction height of the well.

However, in the conventional automatic pressure regulating valve adjustment method described above, the screw member 28 is screwed in to the extent that its head is covered, and then screwed back until the pressure gauge indicates a predetermined pressure. Since the screw-in and unscrewing operations are laborious, the adjustment operations are troublesome and time-consuming.

[Purpose of invention]

The present invention was developed under the above circumstances, and its purpose is to provide an automatic pressure regulating valve for a jet pump that allows the screwing amount of a threaded member to be set appropriately and simply and easily. .

[Summary of the idea]

The present invention provides a screw member for adjusting the set load of a spring member that biases the valve body, and a screw-in amount of the screw member located at the protruding part of the screw member in relation to the suction height of the jet pump. It is characterized in that the setting member for setting is screwed to be replaceable.

[Functions and effects of the invention]

According to the present invention, a setting member having a predetermined length corresponding to the depth of the well to be installed is selected in advance and screwed onto the protrusion of the screw member, and the protruding tip of the screw member is attached to the upper surface of the setting member. If the screw member is screwed in so that the surfaces approximately match, the screwing depth of this screw member will match the suction height of the well to be installed, and the operation of the automatic pressure regulating valve will be adjusted. be able to.

Therefore, if you prepare multiple types of setting members with predetermined lengths depending on the depth of the well, you can select the setting member that corresponds to the well to be installed and attach it to the screw member. This eliminates the need to tighten and unscrew the screw while searching for the optimum screw-in amount, making adjustment work simple and easy, and can be done quickly.

[Example of idea]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIG. 1, reference numeral 20 denotes a valve casing, which has an inlet 21 that communicates with the main pump section 1 side and an outlet port 22 that opens toward the flow rate detection section 12 side. A valve seat 23 is attached to the inlet 21 .
A cover 24 is fixed to the valve casing 20 with bolts 25. The above cover 24
A flange portion 27 of an elastic valve body 26 made of rubber or the like is clamped between the casing 20 and the casing 20 . A screw member 28 is screwed into the cover 24, and this screw member 28 presses the upper spring receiver 29. A lower spring receiver 30 is attached to the valve body 26 by contact or adhesive, and a spring member 3 is attached between the upper spring receiver 29 and the lower spring receiver 30.
1 is placed over the bridge.

Therefore, the valve body 26 is pushed in the closing direction toward the valve seat 23 by the biasing force of the spring member 31. When the pressure on the inlet 21 side is smaller than the biasing force of the spring member 31, the valve body 26 comes into close contact with the valve seat 23 and closes the valve port 34, and as the pressure on the inlet 21 side increases, the valve body 26 closes. , which overcomes the biasing force of the spring member 31 and is pushed up, thereby opening the valve port 34. A projection 32 is formed in the center of the lower spring receiver 30, and a stopper 33 made of a metal sleeve is fitted into the projection 32. The pressure of the fluid flowing into the inlet port 21 causes the valve body 2 to
6 is pushed up, when the stopper 33 hits the upper spring receiver 29, the valve body 26 is prevented from rising any further. Therefore, since the stroke of the valve body 26 is restricted, excessive deformation is prevented, and even if repeated deformation occurs, early breakage will not occur.

A locknut-shaped setting member 35 is screwed onto the screw member 28. This setting member 35 is
When the screw member 28 is set so that its outer end surface is approximately at the same level as the outer end surface of the setting member 35,
It has a length that matches the suction height of the jet pump. That is, if a plurality of setting members 35 with lengths that suit various expected suction heights are prepared in advance, then when installing the pump, the setting member 35 that matches the suction height is selected and installed. As a result, the screwing amount of the screw member 28 can be set to an optimal state depending on the depth of the well.

That is, a setting member 35 having a predetermined length depending on the depth of the well to be installed is selected from among the plurality of types of setting members 35, and is screwed onto the tip of the screw member 28. By screwing in the screw member 28 until the setting member 35 comes into contact with the cover 24 so that it is flush with the upper end of the setting member 35, the screwing amount of the screw member 28 is automatically determined.

Therefore, unlike in the past, there is no need for the troublesome effort of screwing in all the screw members 28 so that they are flush with the top surface of the cover 24 and then returning them to find the optimal screw-in amount. Screw adjustment can be done simply and easily.

Incidentally, after regulating the screwing amount of the screw member 28 by the setting member 35, the screw member 28 may be further finely adjusted.

If the setting member 35 is tightened after such adjustment is completed, the setting member 35 acts as a lock nut, and the screw member 28 can be prevented from loosening.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, as shown in FIG. 2, the setting member 35 may include a nut portion 36 and a washer portion 37 that overlap each other. In such a case, it is sufficient to prepare one nut part 36 and a plurality of washer parts 37 having different thicknesses. In addition, various modifications or applications are possible within the scope of the gist of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is an explanatory diagram showing a modification of the main part, and FIG. 3 is a piping system diagram for explaining the background technology of the present invention. 1... Main pump section, 2... Jet pump section,
3...Suction pipe, 5...Pressure pipe, 6...Discharge pipe, 9
... Automatic pressure regulating valve, 23 ... Valve seat, 26 ... Valve body, 28 ... Screw member, 31 ... Spring member, 35
... Setting member, 36 ... Nut part, 37 ... Washer part.

Claims (1)

[Claims for Utility Model Registration] A valve body provided in a discharge pipe of a jet pump to open and close the discharge pipe, a spring member that biases the valve body in the closing direction, and a screw member that adjusts the biasing force of the spring member. In the automatic pressure regulating valve for a jet pump, a setting member is removably screwed onto the protrusion of the threaded member to set the amount of threading of the threaded member in relation to the suction height of the jet pump. The jet pump features an automatic pressure regulating valve.