HUH3470A - Pressure intersifier - Google Patents

Abstract

Field of the Invention The present invention relates to a booster system with inlet and outlet connected to a suction and discharge side of a plumbing network with rubber compensators · Multiple parallel submersible pumps / 1, 2, ... / van. With an inverter / 55 / control unit / 53 / which is connected via a multi-position selector switch / VK to their current vacuums / 1, 2, ... / connected. The submersible pumps / 1, 2, ... / compression jacket are provided with thermal insulation. The apparatus is designed so that the signaling selector of the control unit / 53 / known per se / U / service provider / 530 /, with its set reference signal circuit / 531 / ven. It has a fault / U ^ / output fault output which is connected to an input of a three-input, controllable analogue switch / 532 / error signal output. The window switcher / 533 / reference terminals / U | The controllable analog switch / 532 / output is connected to a current generator output stage 535 / / / / known by the inverter / 534 /, which is connected to the inverter / 55 /. -A typical feature of the invention is Q, Figure 4 b)

Description

BACKGROUND OF THE INVENTION The present invention relates to a booster device having inlet and outlet® rubber compensators connected to the suction and discharge sides of a plumbing network. It has a plurality of parallel submersible pumps (1, 2, ... /). It has a control unit (53) with Invartarrsl / 55 / which is connected via a multi-position selector switch (VK) to the butterfly pump hole (1, 2, ...). The submersible pumps are arranged in a pressure jacket / 1, 2, ... / which is provided with sound-proofing. The apparatus is configured to have a control unit / 53 / self-supplying control signal (530), known as a control signal (53), and a setpoint control circuit (531) opposed thereto. It has a fault signal output / U ^ / which generates a fault signal output which is connected to one of the inputs of a three-input controllable analog switch / 532 /. The other terminals of the analog switch / 532 / are connected to the reference terminals / U ^, U _a / of _the window comparator / 533 /. The controllable analog switch (532) is connected via an output integrator stage (534) to a current generator output stage (535) known per se, which is connected to the inverter 1/55 /.

Fig. 3, Fig. 4).

xOZZülaiJüi

PÉl.nÁNV

1S030

Representative 29 UMK Patent Office, Budapest ti & ΰθ) ίέ / οΖ 0 & J Z? / 'io

Service invention

PRESSURE EQUIPMENT

Hydraulic Engineering Company, Budaörs

inventors:

Sándor Bódás, Budapest / 15% / Gonda Gyula, Budapest / 10% / István Kalydy, Budapest / 15% / King Uzor, Budaörs / 10% / Makray István, Budapest / 50% /

Date of filing: 01/11/1988

BACKGROUND OF THE INVENTION The present invention relates to a booster device for adjusting a controlled and controlled water pressure value commonly used in water supply, preferably by remote control.

♦ · ·

- 2 Conventionally known equipment for water pressure boosting is the hydrophore, which has the disadvantage that it requires a relatively large air reservoir that requires regular maintenance. The pressure generated by the hydrophore fluctuates strongly between and within the cut-off limit. Fluctuating pressure is a major disadvantage of this known solution, which also limits the use of the hydrophore.

Further, there are known solutions comprising a multi-motor-connected pump having a control device for switching them off. An example of such a product is the pump controller VLA 31 of the known company DANFOSS. These known solutions operate according to a predetermined, fixed control program and therefore can only be very difficult to adapt to the ever-changing water supply needs of the day.

SUMMARY OF THE INVENTION The object of the present invention is to provide a solution to overcome the disadvantages of the known solutions, which is sufficiently flexible to adapt to the changing water supply tasks and allows for the setting of the ground base, appropriate remote control and central monitoring. A further aim of the solution is its water saving operability and reduction of the energy used by the equipment.

♦ · * · ···· · · · · · · · · ·

In practice, the installation of pressure booster equipment must be accompanied by a number of other tasks, in addition to direct control and operational inspection, which vary according to local conditions. These include, for example, star / triangle-triggered pumps, proper timing, selective switching for multiple pumps, opening and closing of appropriate valves, various conditions and conditions - preferably water levels, pressures, heat temperatures, time points, etc. - watching. It is a further object of the present invention to provide such a solution.

It has been discovered that the use of continuous speed controlled pumps can provide significant quality improvement over conventional on-off solutions. The advantage of continuous speed control is that the pressure value is stable and does not fluctuate between the cut-off limits. In the case where several pumps, preferably diving pumps, are connected in parallel, at least one of them is used as a reserve, which is absolutely necessary for the safe supply of water, and at least one of them is operated for the purpose of increasing the pressure. In accordance with the present invention, continuous speed control is known to operate pumps, preferably at least inverter, in a known manner, which saves power according to our experiments since the inverter connected to the inverter always has only the operates at the speed required to generate pressure / nsk / the pump / k /. Experiments have been carried out on several pumps connected in parallel, since at minimum consumption, for example in a housing estate at night, the pressure on the suction side of the plumbing network can be higher than the value we set. In this case, there is no need to operate the pump (s), however, the water will still flow through the system, which will then rotate the pump (s) as a turbine, which will result in unnecessary stress on the bearings. Therefore, according to our experiments, it is very advantageous to have an additional hydraulic by-pass branch which is provided with a non-return valve in parallel with the submersible pumps. By using the hydraulic bridge, energy savings can be achieved and pump / k / demand and revenue can be reduced. It is particularly advantageous to use this solution in locations where the booster system is installed on an existing water supply system to serve water consumption peaks. According to our solution, continuous speed control requires an appropriate control unit.

• · · · ·· ·· ··

It is known that pumps are housed in a discharge jacket. Pressure booster equipment is often installed in places, such as hotels, where the thermal and acoustic effects associated with its operation are not desirable and their environmental impact must be prevented or reduced to a tolerable level. In our solution, the pressure jacket for submersible pumps is therefore sound-insulated1.

An essential element of our solution is the control unit of the inverter that operates the submersible pumps. According to our experiments, the PI unit that contains an integrator set is the most suitable for this purpose. We also realized that it is advisable to provide the booster system with a programmable logic controller, as it is very advantageous to achieve the intended purpose and can be easily coordinated with multiple pressure zones as an extensive system.

BACKGROUND OF THE INVENTION The present invention relates to a booster device having an inlet outlet connected to a suction and discharge side of a plumbing network by means of rubber expansion joints. It has several parallel submersible pumps, an inverter control unit which is connected to the submersible pumps via a multi-position switch. The submersible pumps are arranged in a discharge jacket. The booster device is designed such that the pressure jacket is acoustically insulated, the control unit having a signal selector providing a control signal known in itself, and a setpoint control circuit coupled therewith. It has an error output that is connected to an input of a controllable analog switch with three inputs. The other second and third inputs of the controllable analog switch are connected to window comparator terminals. The output of the analog switch is connected via an integrator stage to an output stage known as a current generator, which is connected to the inverter.

In a preferred embodiment of the booster device, a further hydraulic by-pass branch is provided in parallel with the submersible pumps, which is provided with a non-return valve.

In a further preferred embodiment of the apparatus, the control unit comprises a logic circuit, the outputs of which logic circuit are connected to a control input of a controllable analog switch having three inputs. The logic circuit is preferably constructed from NOR gates.

«·

In a preferred embodiment of the present invention, the outputs of the NOR gates of the logic circuit are preferably connected to a programmable logic controller via a disconnecting and signal forming unit including display means.

A possible exemplary embodiment of the booster device of the present invention will be described in detail with reference to the accompanying drawings, in which:

- Figure 1 shows a parallel arrangement of submersible pumps,

- Fig. 2 shows the positioning of a water pump in a discharge jacket,

Figure 3 is a schematic diagram of the electrical part of the booster set,

Figure 4 is a schematic diagram of a possible solution of the control unit,

and Fig. 5 shows a preferred switching sequence for the submersible pumps.

Figure 1 shows a preferred hydraulic arrangement of the device. The device has a plurality of submersible pumps 1, 2 connected in parallel. In this case, for the sake of simplicity, only two submersible pumps 1, 2 are shown. At least one of the submersible pumps 1, 2 is in operation, the submersible pump l is in operation, and at least one further submersible pump is in reserve.

• ·

According to the present invention, a further hydraulic by-pass branch w is provided, which is provided with a non-return valve 10, in parallel with the submersible pumps 1, 2 connected in parallel. Valves 3, 4, 5, 6, 7, 8 are provided in the Al, A 2 branches with parallel submersible pumps 1, 2 and in the hydraulic bridging PP branch. The submersible branch, Al 2, containing submersible pumps 1, 2 also has non-return valves 9, 11. The aforementioned hydraulic arrangement of the booster device is connected to the suction and discharge side of the plumbing system by means of rubber compensators 12, 13 ·

Figure 2 illustrates the positioning of a submersible pump 1 in a discharge jacket. The submersible pump 1, its motor 21 and its pump 22 are arranged in a pressure housing 20. After the pump 22, a non-return valve 23 is also located inside the discharge jacket 20. The pressure jacket 20 of the pressure boosting apparatus according to the present invention is provided with sound insulation 26. Inside the discharge jacket 20, the non-return valve 23 provides connection to the discharge side through an intermediate piece 24. The discharge jacket 20 also includes a suction nozzle 27 for connecting the submersible pump 1 to the suction side of the plumbing network.

The pressure jacket 20 is further provided with other conventional pump plant fittings, a drain valve 28, and a nipple 29, as well as an elbow 30.

The power supply of the submersible pump 1 is solved by means of a cable gland providing a cable outlet. Preferably, an additional instrument holder 31 is connected to the elbow 30 and is provided with a vent valve 32 through a nanometer 34 valve.

which is preferably connected, for example, to a three-way, and 35 water sensing probes. The manifold 36 is also connected to the insert 24 via an additional elbow 39 in a manner known per se, via a pressure gauge 36 on the pressure side pg.

The pump-side p 2 pressure is measured with the 33 [mu] m already described.

The stub 29 is welded to the periphery of the compression jacket 20 and protrudes from the sound insulation 26. Preferably, a contact thermometer is disposed therein which is in an abnormal operating state

- indicates, for example, an unwanted increase in temperature when operating with longer closed gate valves. Drain valve 28 serves for dewatering the pressure jacket 20 in a manner known per se.

Figure 3 shows a schematic of the main construction of the electrical part of the booster device. As shown, the submersible pumps 1, 2, ... are connected to an inverter 55 via a multi-position selector switch VK. Inverter 55 is connected to control unit 53. For continuous speed control, the control unit 53 is provided with a pressure transmitter 57. The signal from the pressure transmitter 57 is transmitted to the inverter 55 via the control unit 53, which operates the multi-position VK selector switch to operate the operating pump, for example a submersible pump. The control unit 53 is supplied with the required voltages (15 V, 24 V) by power supplies 50, 54 known per se.

In a preferred embodiment, the invention includes a programmable logic controller 51 powered by a 24-volt power supply 52. The conditions required for the operation of the programmable logic controller 51 are from the pressure transmitter 57, the control unit 53 - outputs s, f, e VK wins among other things. The programmable logic controller 51 is also provided with inputs from water sensors W1, W2, ... located in the pressure jacket 20 of each submersible pump 1, 2 and inlet terminals 291, T2, ... arranged on the periphery of the jacket 20. Preferably, for the reliable operation of inverter 55, the control phase monitor 51 is also connected to a relay FR. Controller 51 can be used to switch the inverter 55 on and off, respectively, via switch K and individual submersible pumps 1, 2, .... The current operating status is conveniently indicated by L displays.

Figure 4 shows a circuit diagram of a possible embodiment of the control unit 53. For the 53 control units •. * ·. ··················································································································· failing _β 5 5 5 5 5 _{β β β β β β β β β β β β β β} , this is confronted with the page signal adjuster circuit 531. U _h error signal provider error signal output being connected to one input of analog switch 532 controlled by three inputs. Further, second and third input of analog switch 532 of the window comparator 533 a reference LAU ₀ U terminals are connected. The output of the analog switch 532 is connected via an integrator stage 534 to an output stage 535 of a known current generator, which is connected to the inverter 55.

Referring to FIG. 4, the control unit 53 comprises a logic circuit 536 having outputs of the logic circuit 536 connected to a control input of a controllable analog switch 532 having three inputs. Preferably, logic circuit 536 is constructed from logic NOR gates, and the point of switching is that logic circuit 536 always permits only one of the three inputs of the controllable analog switch control input 532.

The inputs of the controllable analog switch 532 having three inputs are preferably connected to the programmable logic controller 51 via a disconnect and signal generating unit 537 with display means via the outputs s, f, e »· · ·

The pressure boosting apparatus according to the invention operates in detail as follows. The operation of several parallel submersible pumps 1, 2, ... of the apparatus is preferably performed in a predetermined, programmable manner. In the case where the booster device comprises only two submersible pumps 1,2, these can be switched on or off by means of relays known in the art. If more than one submersible pump is controlled, the use of a programmable logic controller 51 is highly advantageous. The programmable logic controller 51 is capable of processing analog signals and preferably displaying them digitally in a manner known per se. The application of the programmable logic controller 51 is also advantageous because its use makes it easy to operate several booster systems in a common water supply system. The programmable logic controller 51 can monitor continuous and programmable data transmission, such as instantaneous pressure values on the discharge and suction sides, target pressure values, water consumption, pump 22 hours, motor speeds, and power consumption. Programmable logic controller 51 allows remote control of p ₂ pressure, selection of appropriate backup unit and utilization of multiple booster systems to coordinate the operation of individual booster systems.

• ·

- 13 The control unit 53 of the booster set operates as follows. 57 by the pressure sensor to the control signal and the υθ coupled with eye-alignment reference circuit 531 shown jelleválasztón U 530 _h generates an error signal. The error signal is formed in the U _h and preferably four komparátoráramkörből

533 for window comparator input. Window comparator 533 has an upper reference terminal and a lower reference terminal U _e . If the error signal U _h of the lower and upper reference values, the reference U is defined _by and between the terminals, in this case, the logic circuit 536 directly from the error signal via switch 534 integrátorfokozatra the controllable analog switch 532.

If the pressure p ₂ generated by the booster device exceeds the reference value, i.e., the magnitude of the λ iq error signal exceeds the value at the upper reference terminal, then the signal at the upper reference terminal 534 is applied to logic circuit 536. This means that the integrator stage 534 reduces its output signal at a constant rate.

Conversely, the operation is similar when the generated pressure p ₂ is below the setpoint value. The

In this case, the integrator stage 534 receives the signal of the lower reference terminal> ₈ , which causes the integrator stage 534 to increase the output signal at a constant rate.

Hysteresis is preferably employed to ensure a definite shift between each boundary. An unstable, temporary situation in the operation of the booster system cannot be allowed. Our experimental experience proves that the use of hysteresis prevents the high-value error signal from reaching the 534 integrator stage. Water supply systems, the principal requirement is to restrict vibrations from the sudden U _h error signals, even if temporarily, to the detriment of the accuracy and speed of control, signal levels shown on the analog switch 532 is not suitable for remote control. These signals are therefore preferably passed through a disconnecting and signal-forming unit 537 containing display elements, which, for example, provide emitter-tracking switching transistors with the signal levels required for remote control. The current operating status of the booster device is preferably displayed. The outputs s, f, e of the isolation and signal generating unit 537 are connected to the programmable logic controller 51. If the ef s output is active, this means that you do not have to change the number of operating pumps 1, 2,. ··. The permanent activation of this output means that, although the submersible pump 1, for example powered by inverter 55, has stopped, the control is not returned to equilibrium, the pressure p ₂ is still higher than required. This situation can only be helped by further switching off. If this happens, * ·

- by the programmable logic controller 51, the pressure which is expected to return the control and thus the error signal back to the band where the integrator stage 534 is effective again is further reduced. If the Pg pressure is still incorrect, another shutdown occurs. Of course, in the opposite direction, the process is similar, in which case output f will be active and the programmable logic controller 51 will attempt to restore the desired equilibrium by activating another pressure boosting unit. The programmable logic controller 51 disables the operation of the control unit 53 via its input m connected to the control unit 53.

The pressure booster device of the present invention enables a constant pressure side ρ ^ to be achieved by continuous speed control. The solution 26 acoustic insulation £ allows the equipment to be used in direct human environments, such as hotels, hospitals. Operating the equipment will save energy and water.

Fig. 5 illustrates, by way of example, the switching order of a pressure booster device ι I consisting of three units P1, P2, P3.

Figure 4z illustrates the relationship between rated power / kW / and water / m / h. When switched on, the P1 unit starts immediately and continuously adjusts the required amount of water.

by the P1 unit only. As the amount of water increases, unit P2 is also turned on - for a moment, a certain pressure build-up occurs, then unit P1 is reduced by the control unit 53 until the desired pressure is reached. In this case, the water supply is provided by a unit P2 of a certain speed and a unit P1 of continuously variable speed. In the upper third of the water volume range, unit P3 is also switched on. Within each region, the on and off units P1, P2, P3 are provided by the programmable logic controller 51 via the outputs s, f, e of the control unit 53.

The pressure booster device of the present invention is well-established in practice.

Claims (4)

1 »Pressure boosting device, the inlet and outlet of which are connected to the suction and discharge side of the plumbing network by means of rubber compensators, have a plurality of parallel submersible pumps, an inverter control unit, which is connected to the submersible pumps by pressure jacket / 20 / soundproofed / 26 / equipped with control unit / 53 / known control signal / U / service signal selector / 530 / with setpoint control circuit connected therewith / 531 / has fault signal / U ^ / generating fault signal has an output which is connected to one of the inputs of the three-input controllable analog switch / 532 / to the other, second and third inputs of the window comparator / 533 / reference terminals / U ^, U _a /, the output of the controllable analog kqo switch / 532 / is via a integrator stage / 534 / to a known current generator output stage / 535 / which is connected to the inverter / 55 /, Apparatus according to Claim 1, characterized in that the hydraulic bridges / 1, 2, ... / additional hydraulic bridges connected in parallel to each other - 18 branches / gears / are connected in parallel with a non-return valve / 10 gates. Device according to claim 1 or 2, characterized in that the control unit / 53 / contains a logic circuit / 536 / whose logic circuit / 536 / outputs are coupled to a three-input controllable analog switch / 532 / controller input. lekoznak. Apparatus according to any one of claims 1 to 3, characterized in that the outputs of the logic circuit / 536 /, preferably in combination with a logic controller / 51 / via a discrete and signal generating unit / 537 / including display elements, are bound. The Trustee ZS. s. ATTORNEY FREE 1011 Budapest Bret tail CHURCH 11th Street: I am a jfcjyvi carrier Taste 29. LAWYER SZABA 1011 Buddha B r a t is free Main Street 11th Attorney UNKAKÖZÖSStü 29. »z. ATTORNEY FREE 1011 Budapest Bret free COMMUNITY Street 11 /.TéT^/dV - □ ω Ο & 7 \ - < 7 \ <Ό —Ο ~ αί <Η c <b