DE2400636A1 - DEVICE IN A SUPPLY SYSTEM FOR FLOW CAPABLE MEDIA - Google Patents

Description

JACUZZI BROS. INCORPORATED, incorporated under the laws of the State of California, 11511 New Benton Highway, Little Rock , Arkansas, V.St.A.

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speed pumps

The invention deals with pumping systems for under Liquids under pressure, especially with water pressure systems.

While the system proposed by the invention is generally used for pumping pressurized liquids can be used, it is and will only be particularly suitable for use in water pressure systems in connection with the latter are described below.

With a water pressure system of the type with which the In accordance with the invention, a pump supplies one or more supply lines, each of which is connected to an outlet valve ends. A pressure switch that normally responds to the pressures in a supply line.

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is set, switches the pump drive motor when the pressure in the supply line falls below a predetermined value Value, for example on the order of 20 to 30 psi (1.4 at to 2.1 at), and the den Pump drive motor switches off when the pressure in the supply line reaches a predetermined high value should be on the order of about 50 psi (3.5 at).

In systems with several, branching supply lines, or in cases in which the pump is not adapted to the system to be supplied, the pump can Build up pressures that are well above the allowable pressure of the pressure switch, with such pressures if they occur in the supply lines and can easily destroy or damage them. Such a dangerous one Situation can occur if the pressure switch does not switch off the pump motor, for example, if none There is a command to increase the pressure further, so that the pump continues to operate, although this is not desired. Pressure can then build up in the supply line, which can damage the lines or their connection points can.

The invention is therefore based on the object of a new and improved pump system for supplying a liquid whose pressure is within a safe range, with the system increasing the pressure in the supply line to values that can be dangerous for the existing connection points, even then excludes if the pump is not switched off as instructed. Next, the system should be an automatic Control for starting and stopping the pump include, with failure of the stop control for the Pump the system's supply lines from the pump

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stay separate.

Further features and advantages of the invention emerge from the following description of a preferred exemplary embodiment of the invention, reference being made to the accompanying drawings.

Show in detail:

Fin. 1 a water supply system in which the invention can be used;

Figure 2 is a perspective view of a controller of the system in which the invention is embodied;

Fig. 3 is a vertical section through a pressure control valve which is an essential component of the Forms the control device according to FIG. 2;

Fig. 4a-4c similar excerpts to explain the

Operating behavior of the valve from FIG. 3; and

Fiq. 5 shows a diagram for comparing the operating behavior a submersible pump from the system according to FIG. 1 and the associated pressures that are shown in a supply line equipped with the invention would occur.

In the preferred embodiment shown in the drawings the invention, this is shown according to FIG. 1 in a system operating with a submersible pump, which a submersible pump 1 and a drive motor 2, both under the water level in a well housing 3 are arranged; The pump supplies a line leading to a control device 7 from the well housing 5, from which a main supply line 9 proceeds. The control device 7 is shown on a larger scale in Fig. shown. The main supply line can be connected to several sub-supply lines and individual lines each of which terminates in a dispensing valve, not shown, and of conventional design can.

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The control device 7 includes a new and improved pressure control valve 11, in welc hem the crucial one Embodiments of the idea of the invention.

The pressure regulating valve has a housing 12 with a threaded inlet port 13 at one end and
a threaded outlet opening 15 at the opposite end, the inlet end 13 being connectable to the pump delivery line 5 and the opposite outlet end to the supply line 9 being connectable.

The inlet end is closed off by a partition 17 through which is substantially perpendicular to the axis of the
Inlet opening leads a threaded opening 19 into which a connection piece 21 having a valve seat 23 is screwed.

In axial alignment with the valve seat, a closure body 25 is held by a bracket 27 extending from a diaphragm 29, the diaphragm 29 spanning an opening in the housing and in its position by one
Spring housing 31 is held, which in the opening
is used.

In the spring housing there is a compression spring 33 which rests at one end against the membrane and at the other end against an adjusting screw 35 which passes through the end
of the spring housing protrudes in such a way that the screw head 37 remains accessible for setting or adjustment. the
Adjustment of the spring determines the size of the regulated pressure at the outlet opening 15 of the valve according to conventional practice.

In the flow path for the liquid is located between the inlet opening 13 and the chamber opening 19

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Filter 41, which retains foreign matter and bodies arriving with the water from the pump.

It can be seen from the foregoing description that the pressure regulating valve passes through pressurized fluid the inlet opening from the pump receives when the latter runs that the liquid flows through the valve and that, depending on the conditions beyond the outlet opening, a back pressure builds up against the membrane, which acts against the compression spring, and that when this back pressure exceeds that value, the through the setting of the spring is specified, the membrane moves against the spring, compressing it is, in which case the closure body is moved in the direction of the valve seat. During this movement of the Closure body, an increase in the pressure drop across the valve causes the diaphragm to return to its original state Would like to return to the position. ' As a result, the closure body will therefore move around one position move, whereby the pressure at the outlet port substantially is held at a value that corresponds to the setting of the spring, despite the pump pressure at the inlet end of the valve.

There is a pressure switch on the housing of the pressure control valve 43 screwed on, and exposed to the pressure prevailing on the outlet side of the valve; the pressure switch. 43 is by virtue of this coupling exposed to the pressure remaining in the supply line of the system. This pressure switch is switched on in the usual way in the circuit for motor 2, which drives pump 1, the switch being set to turn the pump motor into the circuit when the Pressure in the supply line below a predetermined low value, such as on the order of 1.4 at 2.1 at (20 or -30 psi) has dropped, and the pump-.

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penmotor is disconnected from the voltage source when the pressure in the supply line rises to a higher predetermined value, which is nevertheless still within the safety area for the connection points and the pressure-sensitive points of the supply line lies.

In connection with the pressure control valve and the pressure switch there is a small stretchable,! hurry 45 or similar pressure device, the function of which is to maintain the pressure in the supply line during the idle states of the system, and at open a supply line to let the pressure drop quickly enough that the low pressure setting of the Pressure switch reached and- the pump motor is started, while under other circumstances, such as small Leaks within the system, the start of the pump motor is delayed. Such a device includes one Rubber bladder 46 in a housing 47, which is the largest possible Expansion of the bladder to a limited volume or capacity on the order of 340 c of water limited.

This pressure device can preferably be in a channel 48 in the housing of the pressure control valve on the low-pressure side be screwed in, wherein the channel is expediently aligned with the closure body 25.

If such a pressure equalization device is connected to the system, then when the liquid is withdrawn from the supply line the pressure compensation device to the in the supply line to At the time of completion, the pressure prevailing "charged". If the extraction valve is opened later, the

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Pressure compensation device "discharges" immediately to the pressure value at which the pressure switch controls the pump motor starts up and puts the pump into action.

Although understandably under certain circumstances Pressures can build up, which is very likely to damage the connection points in the supply line or other pressure-sensitive sections of the system, it will actually be in the supply line The prevailing pressure due to the function of the pressure control valve is significantly lower and above all stay at a safe value that is determined by the setting of the pressure regulator spring while at the same time the demands to be fulfilled for the supply are satisfied.

If during those operating phases of the 'system, at the requirements caused by the withdrawal of liquid from the supply line and the withdrawal points to the system are almost fulfilled, pressure difficulties can be expected in the supply line because then, if during this operating phase, the creation of high pressures in the supply line is permitted such pressures will be maintained by the pressure equalization device and remain until a request to the system due to a new withdrawal occurs. Under these circumstances, the pressure-sensitive parts or connection points of the supply line very well destructive pressures be exposed over long periods of time, what.mit a probability of destruction of the connection points will lead. It is therefore advisable to prevent potentially destructive pressures being created during the closing process to prevent the extraction valves at the end of the supply line.

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This requirement is usually met by a satisfactory one Functioning of the pressure switch, which is intended to turn off the pump while the supply line pressure is still at a safe level. However, if the pressure switch malfunctions shows or fails, the pump will continue to run even though all extraction valves are closed so that in a conventional system under these conditions the pump would be free to reach its maximum achievable pressure of the supply line. This problem addressed here is made more excellent and nonetheless special by the preferred embodiment of the invention simple modification to the design of the pressure control valve solved.

This modification provides that the valve seat 23 is deliberately made "defective" by having a or several, small V-grooves 24 are provided in the seat itself, and that the closure body 2 5 with a Sealing washer 55 made of rubber or equivalent material, preferably neoprene rubber of 50-65 degrees of hardness (Durometer ) is provided, the sealing washer 55 being held against a metal plug 57 which is inserted into the Retaining bracket 27 is screwed in. The metal plug preferably extends into channel 48 and is on its opposite end provided with a screwdriver slot. When the pressure compensation device is removed therefore the closure body can be installed or removed through the channel with the aid of conventional tools.

The grooves can form an angle of 60 ° and a depth

dd

of 0.813 mm (0.032) above the valve seat, depending in detail on the properties of the sealing material depends.

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The sealing material actually used and the dimensions of the groove (s) can be adapted to the particular System requirements can be adapted.

When maintaining a regulated pressure on the On the outlet side of the pressure control valve, the distance between the closure body and the valve seat changes with the respective withdrawal requirements. When less fluid is withdrawn from the end of the supply lines and so that the requirements are lower, as when closing a withdrawal valve (cock), the Closure body to move to its closed position. When finally the one in the utility line still required pressure build-up decreases to zero, the closure body will sit down to the Cams that allow leakage channels for a limited throughput of medium. If such a limited If the medium throughput exceeds the decreasing demand for liquid, a pressure build-up occurs in the supply line initiated, which, within an increase of the order of 9 Ib (about 4 kg) e.g. depending on the Property of the sealing material and the shape of the grooves, which presses the sealing washer into the grooves and the supply line completely disconnects from the pump, which in the event that in the meantime the pressure switch has failed or has not switched off the pump motor, continued operation of the pump is a problem in the The supply line can finally no longer influence the prevailing pressure, since the supply line is now complete isolated or shut off from the pump.

Although thus the pump itself can develop extremely high pressures for those with the supply line connected connections were destructive, the utility line section of the system is now opposite the structure of such high pressures protected.

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By using grooves as secondary paths around the closure body, in contrast to small holes or the like a blocking or clogging 'avoided because the grooves Clean yourself during the opening times of the valve body.

In FIG. 5, the curves entered there explain a typical example of the invention, that of a submersible pump system as shown in Fig. 1 may be. For this particular system the pump line curve shows 61 that when delivering 2 galons per minute (about 1.9 liters per minute) inclusive, the pump has a could develop a maximum pressure of over 180 psi (12.7 at), which goes far beyond what is considered to be the * sensitive supply line parts can be considered compatible. The pressure control valve could Disconnect the supply line from the pump at a safe pressure 63 in the supply line, indicated in on the order of 59 psi · (about 4.15 at) with the pressure switch in this example set so is that it shuts down the pump motor at a lower value 65 on the order of 50 psi (3.52 at). Thus, the actual shutdown in the event of a pressure switch failure takes place at around 9 Ib (0.6 at) higher than the cut-off pressure to which the pressure switch is set, with this difference sufficiently takes into account the tolerance in the response of the pressure switch and ensures that the Pressurizer is given a sufficient opportunity to function before the pressure control valve closes the supply line disconnects when the pressure switch shows malfunction and the pump continues to run.

Relative to such a safe pressure value 63, the pressure regulating valve is set so that it is under pressure

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passes such a value along the curve 67, starting with the cut-in pressure; 69 of the pressure switch, where the shutdown pressure; of the pressure switch is set to the value indicated at 65.

The invention was based on an exemplary embodiment, in particular in connection with a Pumping system for water systems described. However, the skilled person is clear that the invention is based on this Attachments is by no means restricted to the fact that many changes are made to the example described be undertaken without deviating from the concept underlying the invention.

Overall, a pump system for pressure media has been described in which a pressure switch is used for starting and can control stopping of a pump within a predetermined pressure range; in the event of misconduct the pressure switch, the supply line connected to the pump is disconnected from the pump, around the supply line against the build-up of potentially damaging pressures to protect.

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Claims (6)

EI SENFOHR & SPEISER 2400B36 OPL-Ina DIETER K. SPEISER BREMEN DrhbinatHORST ZlNNGREBE Jt US. CHARACTER: J 86 APPLICANT: JACUZZI BROS. INC. FILE REFERENCE: _{p 24 QQ} Date: March 6, 1974 NEW DEMANDS IJ device in a fluid supply system Medium, in particular liquids, with a medium line network consisting of at least one in a shut-off device or the like. ending supply line, with one between the network and one Medium source switched medium pump, as well as with a switching device for the pump drive, which in a If the medium pressure in the network falls below a first predetermined value, the pump drive is switched on and when the medium pressure in the network exceeds a second predetermined value, the pump drive switches off, characterized in that a reducing device between the pump (1) and the network (9) (7) is switched, which reduces the medium delivery pressure of the pump to the medium pressure in the network; and that a safety device (23,51 ....) for a possible failure of the switching device (43) is provided. 2. Device according to claim 1, characterized in that the reducing device is a pressure control valve, which has an inlet opening (13) for receiving under 409833/0670 HZ / gs 24-0636 / 3 Pressurized medium, an outlet opening (15) for the discharge of the absorbed medium under reduced Pressure, as well as a closure body (25) with associated valve seat (23) between the inlet and outlet opening in the flow path of the medium and a device (51,23, ...) has a leakage path when the closure body is initially placed on the valve seat defined around the closure body. 3. Apparatus according to claim 2, characterized in that at least one groove (51) in the valve seat (23) is provided defining a leakage path; and that the closure body has a sealing washer (55), which is deformable and after pressing the closure 4. Apparatus according to claim 2 or 3, characterized in that the separation pressure at which the safety device disconnects the network from the pump, on the order of 9 psi (about 0.633 at) above the cut-off pressure the switching device (43) is located. 5. Device according to one of claims 1-4, characterized in that a pressure switch (43) on the housing (12) the reducing device is attached and under the action of the reduced pressure on the Downstream of the housing is. 6. Device according to one of the preceding claims, characterized by an expandable cell (45) which is attached to the housing (12) and under the action of the reduced pressure on the downstream side of the housing. 4D9833 / 067 0 Blank page