CN111043053A

CN111043053A - Pump device

Info

Publication number: CN111043053A
Application number: CN201910962975.5A
Authority: CN
Inventors: F.辛格; S.劳赫
Original assignee: Albert Ziegler GmbH
Current assignee: Albert Ziegler GmbH
Priority date: 2018-10-11
Filing date: 2019-10-11
Publication date: 2020-04-21
Anticipated expiration: 2039-10-11
Also published as: DE102018217439A1; CN111043053B; EP3636931A1

Abstract

The invention relates to a pump device, comprising: a pump (12), in particular a fire pump, which, during operation, sucks water via a suction side (15) and discharges water via a pressure side (16); and a control device (19) for controlling pump operating variables of the pump (12) on the pressure side of the pump (12) as a function of a setpoint output pressure that can be set by an operator, wherein one of the pump operating variables is the output pressure on the pressure side of the pump (12); and a monitoring device (20) coupled to the regulating device (19) for monitoring a pump operating state that can be characterized by means of the pump operating variable, such that, in the event of a disturbance of the pump operating state, a feedback can be generated to the regulating device (19) and a change of the associated pump operating variable can be generated by means of the feedback for the purpose of eliminating the disturbance.

Description

Pump device

Technical Field

The invention relates to a pump device having a pump, in particular a fire pump, which in operation draws water via a suction side and delivers water via a pressure side.

Background

This type of pump device has been used for centuries. A portable embodiment of such a pump device, which can be carried to a corresponding location and is not fixedly installed in a vehicle, in particular a fire fighting vehicle, is also referred to as a portable power sprayer. Conventionally, a fire fighting rotary pump is used as a pump of such a portable power jet apparatus, which can be driven by an internal combustion engine located on the rim of the portable power jet apparatus. Such portable power spray devices have the advantage that they can be used remotely from emergency vehicles for removing water from open bodies of water. A non-portable embodiment of such a pump device is a pump installed in a vehicle, in particular in a fire engine, a so-called built-in pump, which can be driven by a vehicle drive, usually by an internal combustion engine.

Such pumps are usually equipped with a monitoring device, with which various pump operating variables, in particular the output pressure on the pressure side of the pump, are monitored. In the case of portable power injection devices, temperature monitoring and monitoring of the filling level of the fuel tank are also common. The pump operating parameters are measured and visualized by means of a monitor display. Typically, the monitor display includes a screen through which the operator can retrieve various pump operating parameters. In older pumps, a similar measurement display was used instead of a screen.

In order to check the condition of such pumps, the operator must always be present in the field in order to be able to read the relevant values of the pump operating parameters.

This is based on the premise, in particular in the case of portable power-assisted spray devices which are provided remotely from the emergency vehicle, that the operator must always remain at the portable power-assisted spray device in order to be able to intervene if necessary when certain pump operating variables exceed or fall below permissible maximum or minimum values. A particularly critical situation for such pumps is the risk of cavitation (Kavitation), which can damage or in the worst case destroy the pump, however in any case hampering the water transport at the point of use. If the pump is to give more water than the supplementary flow (naphthameter) through the pump inlet, the pressure drops partly below the steam pressure. The water is evaporated rapidly and the bubbles collapse just as rapidly (zusammenfalen). These implosions (implosions) can cause material separation on the surface of the rotor or guide of the pump. In case the cavity runs long, this may lead to performance degradation or pump failure. In addition, the filling level of the fuel tank is monitored, in particular in the case of portable power injection devices, in order to be able to fill the tank in a timely manner.

Disclosure of Invention

The object of the present invention is to provide a pump device of the type mentioned at the outset which is less susceptible to interference than conventional pump devices and which can be operated by an operator with less effort.

This object is achieved by a pump device having the features of independent claim 1. The invention is characterized in that it is set forth in the dependent claims.

The pump device according to the invention has a pump, in particular a fire pump, which in operation draws water via a suction side and delivers water via a pressure side, wherein the pump device has a control device for controlling pump operating variables of the pump on the pressure side of the pump as a function of a setpoint output pressure that can be set by an operator, wherein one of the pump operating variables is the output pressure on the pressure side of the pump, and wherein the pump has a monitoring device coupled to the control device for monitoring a pump operating state that can be characterized by means of the pump operating variables, such that in the event of a disturbance of the pump operating state a feedback to the control device can be brought about and the associated pump operating variable can be changed by the feedback for the purpose of removing the disturbance.

Thus, it is only necessary for the operator to adjust the nominal output pressure on the pressure side of the pump. The operator does not need to stay on site because the adjustment device takes on all other tasks. The pump is therefore autonomous and all corrections are performed by the combination of the monitoring device and the regulating device. In particular, by throttling or increasing the rotational speed of the pump drive, in particular, the output pressure on the pressure side of the pump is adjusted to the set target output pressure, as a result of which the delivery output and thus the output pressure is reduced or increased.

However, the pump device is not only capable of regulating the output pressure on the pressure side of the pump, but also of regulating and monitoring the pump as a function of the input pressure, the pump characteristic curve field and the motor characteristic data. Furthermore, the rotational speed of the pump drive can be adjusted. Furthermore, monitoring of the filling level of the fuel tank can also be achieved, in particular when the pump device is designed as a portable power injector.

In a further development of the invention, the operating state of the pump monitored by means of the monitoring device is selected from the group consisting of the output pressure, the operating temperature, the input pressure, the rotational speed and the field of the pump characteristic curve. Monitoring the operating temperature is important to prevent overheating of the pump device. If a critical increase in the operating temperature occurs, the regulating device can regulate the power of the pump, i.e. in particular the rotational speed of the pump drive, in a downward direction. The monitoring of the presence of cavitation is important for the pump device and serves to react in operating states outside the normal operation of the centrifugal pump, for example by regulating the output pressure, with a decreasing input pressure and a rising rotational speed at the same time indicating cavitation. The rotational speed is then set back until a plausible pressure/rotational speed value is reached and in parallel is warned by a status display (colored light). Furthermore, it is also possible to monitor whether there is a pump lock, for example when the motor is running at full speed and low speed and then there is a motor torque at low speed through possible pump demands.

In a particularly preferred manner, the monitoring device has at least one measuring element, in particular a measuring sensor, for measuring the determined actual value of the pump operating variable and for transmitting a monitoring display for displaying the measured actual value of the pump operating variable. Although the pump device operates autonomously, it is thus still possible for an operator to retrieve the value of the determined pump operating variable by means of the monitoring display.

In a particularly preferred manner, the monitoring device has a pressure sensor for measuring an actual value of the output pressure and/or of the input pressure on the pressure side and/or suction side of the pump and for transmitting the actual value of the output pressure and/or of the input pressure to the regulating device.

It is possible for the monitoring device to have a rotational speed sensor for measuring an actual value of the rotational speed of the drive shaft of the pump drive and for transmitting the actual value of the rotational speed to the control device.

In a particularly preferred manner, the monitoring device has at least one operating state light or status light for visualizing the associated current pump operating state, so that the relevant pump operating state is signaled by a light emission of a first signal color, and a fault (e.g. empty fuel tank, motor stop) is signaled by a light emission of a second signal color different from the first signal color. The operating state light can be designed, for example, as an LED light. Typically, the signal color green is used for normal and red is used for fault.

In a further development of the invention, the operating state light is provided for emitting light in more than two signal colors that differ from one another in order to display further quality states of the pump operating state concerned. For example, for a critical (e.g., fuel container will be empty) pump operating condition, the signal color may be yellow.

In a development of the invention, the pump device is designed to be portable. Suitably, the portable pump device is a portable power sprayer device.

However, the pump device according to the invention can also be used as a built-in pump installed in vehicles, in particular in emergency duty vehicles, preferably in fire fighting vehicles.

In a further development of the invention, the monitoring device is designed in such a way that the occurrence of an inlet pressure on the suction side can be detected and the pump drive can be activated in connection therewith. Particularly preferably, a pressure monitor or a pressure sensor is arranged on the suction side of the pump. Another operating point is operation on open bodies of water (wells, streams, etc.). The relative input pressure is negative there and changes when the suction level increases or when air is sucked in or when the suction screen is clogged with dirt. This is what may happen with cavitation. If the input pressure drops further due to one of the above conditions, the rotational speed is adjusted back to prevent cavitation and a warning is issued by the signaling means. If the water delivery is not possible, a fault report is displayed by the signaling device. In series operation of a plurality of pumps (or pump operation according to hydraulic pressure), the pumps are adjusted to a predetermined operating pressure as soon as the pressure reaches the suction inlet. As soon as the pump can no longer maintain the preset operating pressure (the input pressure drops in parallel), the pump returns its rotational speed and warns the operator via a signaling device. As soon as the pump no longer delivers according to the pressure parameters, the pump is switched off and a fault is reported by the signaling device. Once the input pressure rises again, the pump resumes its operation. For such work, there is always a need for a mechanic that must monitor and control the pump.

The invention also comprises an emergency mission vehicle (Einsatzfahrzeug), in particular a fire engine, characterized by a pump arrangement according to any one of claims 1 to 11.

Drawings

Preferred embodiments of the present invention are shown in the drawings and will be described below in detail. The sole figures show:

schematic view of a preferred embodiment of a pump device according to the invention.

Detailed Description

The figure shows a preferred embodiment of a pump device 11 according to the invention. The main component of the pump device 11 is a pump 12, which is described below by way of example in the form of a fire-fighting rotary pump. The pump device 11 is described in the form of a so-called portable power sprayer, for example, by means of a portable pump device 11. In principle, however, it is also possible for the pump device 11 to be used as an internal pump, where it is then installed on the edge of an emergency service vehicle, in particular a fire engine.

The rotary fire pump, which is referred to below for the sake of simplicity as pump 12, has a pump housing 13, which surrounds the pump chamber. A pump rotor (not shown) is movably accommodated in the pump chamber. Suitably, a radial rotor is used as the pump rotor, which is driven by the output, in particular the output shaft, of the internal combustion engine 14 on the rim of the portable power jet device.

During operation, the pump rotor draws water or, if appropriate, a water/foam mixture from a fire water container 18, for example a fire water tank, via the suction side 15 and a suction line 17 connected thereto and conveys the drawn water into the pump chamber. The pumped water is delivered via the pressure side 16, in the case of a radial rotor, i.e. in the radial direction, with an increased pressure. On the pressure side 16, a plurality of fire hoses can usually be connected, at the free ends of which are fastened radiant tubes, through which fire water can be brought in a targeted manner to the fire scene for extinguishing fires.

The internal combustion engine 13 may be a gasoline motor or a diesel motor. In principle, electric vehicle drives are also conceivable. The drive can also take place via the cardan shaft/auxiliary power take-off (Nebenabtrieb) of the vehicle.

The pump device 11 furthermore has a control device 19 for controlling a pump operating variable of the pump 12 on the pressure side 16 of the pump 12 as a function of a setpoint output pressure that can be set by an operator.

The pump device 11 also comprises a monitoring device 20 for monitoring a pump operating state that can be characterized by means of a pump operating variable, so that, if the pump operating state is disturbed, a feedback is implemented to the regulating device and, by means of this feedback, a change of the associated pump operating variable is implemented for the purpose of removing the disturbance.

The pump operating variables that can be set by means of the setting device 19 include all pump operating variables that can be set at the pump 12, i.e., for example, the inlet pressure on the suction side 15 of the pump 12, the outlet pressure on the pressure side 16 of the pump 12, the rotational speed of the drive shaft 22 of the internal combustion engine 14 or the filling level of a fuel tank (not shown) for supplying fuel to the internal combustion engine 14. The output pressure on the pressure side 16 of the pump 12 can be adjusted, for example, via the pump speed.

In the example case shown, the pump operating variables, i.e. the input pressure on the suction side 15 and the output pressure on the pressure side 16, are set by adjusting the rotational speed of the drive shaft 22 of the internal combustion engine, as will be described in more detail below.

In the example shown, the monitoring device 20 has a plurality of measuring elements 21a-c for measuring a specific pump operating variable. The measuring elements 21a-c are configured in the example case as measuring sensors.

On the pressure side 16 of the pump 12, a pressure sensor 21a is arranged, which monitors and measures the output pressure on the pressure side 16 and transmits the measured actual value to the regulating device 19, for example wirelessly.

Furthermore, a rotational speed sensor 21b is arranged on the drive shaft 22 of the internal combustion engine 14, which rotational speed sensor monitors and measures the rotational speed of the drive shaft 22 and transmits the measured actual value of the rotational speed to the regulating device 19.

Furthermore, a further pressure sensor 21c is arranged on the suction side 15 of the pump 12. The pressure sensor 21c monitors the input pressure on the suction side 15 of the pump 12 and likewise transmits the measured actual value of the input pressure to the regulating device 19.

Furthermore, the monitoring device 20 has a monitoring display (not shown), for example in the form of a screen, for displaying the actual values of the measured pump operating variables, i.e. in this example the output pressure and the motor speed on the pressure side 16 of the pump 12.

The determined operating state of the pump can be monitored by means of the monitoring device 20. The pump operating conditions that are monitored include output pressure, operating temperature, and cavitation.

An important component of the monitoring device 20 is an operating status light 23 or a status light for visualizing the associated current pump operating status. The operating state light 23 is provided such that a light emission of a first signal color, for example green, signals a normal operating state of the pump concerned, i.e. for example an operating temperature, and conversely a light emission of a second signal color, for example red, which is different from the first signal color, signals a fault.

Expediently, the operating state light 23 is provided for emitting light also in a third signal color, for example in a yellow signal color, wherein the yellow emission represents a critical pump operating state. Of course, a plurality of operating status lights or condition lights, each representing a signal color, for example red, yellow and green operating status lights, can also be used.

The operation of the pump device 11 proceeds as follows:

the operator inputs the setpoint output pressure on the pressure side 16 of the pump via the regulating device 19. All other tasks are undertaken by the autonomously operating pump device 11. First, it is known whether fire water is already in the suction line 17 by means of a pressure sensor or pressure monitor on the suction side 15 of the pump 12. If this is the case, the pressure sensor reports this to the regulating device 19, which activates the internal combustion engine 14, thereby starting the operation of the pump 12.

The pressure sensor 21a on the pressure side 16 of the pump 12 continuously measures the actual value of the output pressure on the pressure side 16 and transmits the measured value to the regulating device 19. If the actual output pressure drops below the set setpoint output pressure, the control device 19 sends a signal to the internal combustion engine, thereby increasing the rotational speed of the drive shaft. This also increases the rotational speed of the pump rotor and thus the output of the pump 12. In principle, the green emission of the operating state light 23 can be used to indicate that the setpoint output pressure is maintained, and the operating state light 23 can emit yellow when the nominal output pressure drops below.

The pump device 11 also has a hole warning in the event of a hole hazard, for example by the operating status light 12 emitting red light. Furthermore, a temperature measuring probe (not shown) is provided, which monitors the operating temperature. In this case, the operating state light 23 can also emit red light when the permissible maximum operating temperature is exceeded. Furthermore, it is possible to monitor the filling level of a fuel tank for an internal combustion engine and then to indicate a low filling level of the fuel in the fuel tank, for example by yellow glow of an operating light.

Claims

1. A pump device is provided with: a pump (12), in particular a fire pump, which, in operation, draws in water via a suction side (15) and delivers water via a pressure side (16); and a control device (19) for controlling pump operating variables of the pump (12) on the pressure side of the pump (12) as a function of a setpoint output pressure that can be set by an operator, wherein one of the pump operating variables is the output pressure on the pressure side of the pump (12); and a monitoring device (20) coupled to the regulating device (19) for monitoring a pump operating state that can be characterized by means of the pump operating variable, such that, in the event of a disturbance of the pump operating state, a feedback can be generated to the regulating device (19) and, by means of the feedback, a change of the associated pump operating variable can be generated for the purpose of eliminating the disturbance.

2. Pump device according to claim 1, characterized in that the pump operating variable which can be set by means of the setting device (19) is selected from the group consisting of, in addition to the output pressure on the pressure side (16) of the pump (12): an input pressure on the suction side (15) of the pump; the filling level of the fuel tank; and the rotational speed of the pump drive.

3. A pump arrangement according to claim 1 or 2, wherein the pump operating state monitored by means of the monitoring device is selected from the group consisting of: an output pressure; operating temperature; inputting pressure; speed and pump characteristic curve fields.

4. Pump device according to one of the preceding claims, characterized in that the monitoring device (20) has at least one measuring element (21 a-c), in particular a measuring sensor, for measuring an actual value of the determined pump operating variable and transmitting it to the regulating device (19), and comprises a monitoring display for displaying the measured actual value of the pump operating variable.

5. Pump arrangement according to claim 4, characterized in that the monitoring device (20) has a pressure sensor (21 a) for measuring an actual value of the output pressure on the pressure side (16) of the pump (12) and for transmitting the actual value of the output pressure to the regulating device (19).

6. Pump arrangement according to claim 4 or 5, characterized in that the monitoring device (20) has a rotational speed sensor (21 b) for measuring an actual rotational speed value of a drive shaft of the pump drive and for transmitting the actual rotational speed value to the regulating device (19).

7. Pump device according to one of the preceding claims, characterized in that the monitoring device (20) has at least one operating state light (23) for visualizing the associated current pump operating state, so that the relevant pump operating state is signaled by a light emission of a first signal color and a fault is signaled by a light emission of a second signal color, which is different from the first signal color.

8. Pump arrangement according to claim 7, characterized in that the operating state light (23) is arranged for emitting light in more than two mutually different signal colors in order to display further quality states of the pump operating state concerned.

9. Pump arrangement according to any of the preceding claims, characterized in that the pump arrangement (11) is configured as a built-in pump that can be carried or installed in an emergency mission vehicle.

10. Pump device according to claim 9, characterized in that the portable pump device (11) is a portable power jet device.

11. Pump device according to one of the preceding claims, characterized in that the monitoring device (20) is configured such that the occurrence of an input pressure on the suction side (15) can be recognized and the pump drive can be activated in connection therewith, wherein preferably a pressure sensor (21 c) is arranged on the suction side (15) of the pump (12).

12. Emergency mission vehicle, in particular fire engine, characterized by a pump device (11) according to any of the preceding claims 1 to 11.