JP2009041500A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device capable of being attached without changing installation piping and of carrying out variable speed operation control such as constant pressure control by a pump single body. <P>SOLUTION: The pump device having a pump part 10 provided in a pump casing 2 and including an impeller 11 and a motor part driving and rotating the impeller 11 integrated, is provided with a pressure tank 15 storing liquid pressurized by the pump part 10, a pressure sensor 27 detecting pressure of liquid pressurized by the pump part 10, and a control part 30 receiving signal of the pressure sensor 27 and carrying out variable speed operation of the pump part 10. A part of a pump casing 2 constructs an outer shell of the pressure tank 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pump device including a control device that drives a pump at a variable speed.

  Conventionally, pump devices have been used in various applications at various sites such as various houses and factories. For example, an in-line pump in which a pump unit and a motor unit are integrated and the suction port and discharge port of the pump are arranged on the same line is widely used because it can be easily attached in the middle of a pipe. Most of such in-line pumps are operated with a commercial power supply at a fixed maximum speed. Energy saving can be achieved by using a variable speed pump device that operates the pump at a variable speed according to the amount of water demand, but piping work is required to replace the fixed speed inline pump with a variable speed type using an inverter. It was.

  The present invention has been made in view of the above circumstances, and provides a pump device that can be installed without changing equipment piping and can perform variable speed operation control such as constant pressure control by a single pump. Objective.

  In order to achieve the above-described object, the present invention provides a pump device in which a pump unit provided in a pump casing and having an impeller and a motor unit that rotationally drives the impeller is integrated with the pump unit. A pressure tank for storing the liquid, a pressure sensor for detecting the pressure of the liquid boosted by the pump unit, and a control unit for receiving a signal from the pressure sensor and operating the pump unit at a variable speed. A part of the casing constitutes an outer shell of the pressure tank.

  According to the present invention, since the pump device is provided with the pressure tank, the pressure sensor, and the control unit, the variable speed operation control of the pump can be performed only by installing the pump device in the field. And since the outer shell of a pressure tank is constituted using a part of pump casing, cost can be reduced remarkably compared with the case where a pressure tank is provided separately.

In a preferred aspect of the present invention, a check valve is provided in the pump casing.
In a preferred aspect of the present invention, the control unit includes a storage unit that stores data necessary for operation control of the pump device, and a communication unit that transmits and receives information to and from the outside.
According to the present invention, data stored in the storage means can be transmitted to a communication network or the like via the communication means, and data can be received from the communication network or the like via the communication means and written to the storage means.

In a preferred aspect of the present invention, the pressure sensor is attached to the pump casing.
In a preferred aspect of the present invention, the pump device includes an in-line pump in which the pump unit and the motor unit are integrally accommodated in the pump casing.
According to the present invention, an existing pump that has been operated at a constant speed can be removed from a pipe, and the pump device of the present invention can be attached to the pipe, thereby providing a variable speed operation pump. Energy saving can be achieved. Also, when a pump device is newly installed, it is only necessary to connect the suction side piping and the discharge side piping to the pump device, and piping work can be minimized.

In a preferred aspect of the present invention, the pump device includes an in-line pump in which the pump portion provided in the pump casing and the motor portion provided outside the pump casing are integrated. It is characterized by that.
According to the present invention, an existing pump that has been operated at a constant speed can be removed from a pipe, and the pump device of the present invention can be attached to the pipe, thereby providing a variable speed operation pump. Energy saving can be achieved. Also, when a pump device is newly installed, it is only necessary to connect the suction side piping and the discharge side piping to the pump device, and piping work can be minimized.

In a preferred aspect of the present invention, the control unit performs pump discharge pressure constant control or estimated terminal pressure constant control in response to a signal from the pressure sensor.
In a preferred aspect of the present invention, the storage means has an area for storing an identification number unique to the pump device.
In a preferred aspect of the present invention, the storage means includes at least the number of pump devices of the same type installed in parallel, the number of pump devices of the same type that can be operated in parallel, the number of pump devices currently operating, and a pump device that has failed. It has the area | region which memorize | stores the number of.
According to the present invention, the unique identification number stored in the pump device and the function of transmitting and receiving information (data) to and from the pump device through various communications are provided, so that the specification of the pump is changed later. be able to.

In a preferred aspect of the present invention, the communication means transmits / receives information to / from a pump device of the same type provided side by side.
In a preferred aspect of the present invention, the information stored in the control unit can be output to a terminal device by the communication means.
In a preferred aspect of the present invention, the terminal device includes at least one of a personal computer, a PDA, and a mobile phone.

  According to the present invention, since communication with a mobile terminal device such as a PDA, a notebook computer, or a mobile phone is possible through communication means, a service person working on site receives the operating state of the pump device. No special terminal equipment is required to store the maintenance performed in the pump device itself.

The present invention has the following effects.
1) Since the pressure tank, the pressure sensor, and the control unit are provided in the pump device, automatic operation control of the pump can be performed only by installing the pump device at the site. Therefore, it is not necessary to perform piping work for separately providing a pressure tank, a pressure sensor, etc. for automatic operation of the pump.
2) A conventional pump that has been operated at a constant speed can be removed from the pipe, and the pump device of the present invention can be attached to the pipe to provide a variable speed operation pump, which can be easily saved without changing the equipment piping. Energy can be achieved.
3) The unique identification number stored in the pump device and the function to send and receive information (data) to and from the pump device through various communications, so the pump specifications can be changed later, so It can be installed conveniently. Even if the control is changed, the control program can be replaced remotely, so that the maintenance staff does not need to go to the site.
4) The state of the pump device can be known from a remote location, and maintenance is easy. In addition, fine control of the pump device is possible.

Hereinafter, an embodiment of a pump device according to the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a cross-sectional view showing a barreled motor pump which is an embodiment of the pump device of the present invention. As shown in FIG. 1, the pump device 1 includes a barreled motor pump (canned motor pump) in which a pump unit 10 and a canned motor unit 20 are integrally accommodated in a pump casing 2. A barreled motor pump is a kind of in-line pump (line pump). The pump unit 10 is disposed on the pump suction side, and the pump unit 10 includes two-stage impellers 11 and 12 supported by a main shaft 21. On the other hand, a diaphragm type pressure tank 15 formed integrally with the pump casing 2 is disposed on the pump discharge side. A plate type check valve 25 is disposed radially inward of the diaphragm type pressure tank 15. It is arranged. Further, a pressure sensor 27 is attached to the pump casing 2 so that the discharge pressure of the fluid on the pump discharge side can be detected.

  The pump casing 2 includes a cylindrical barrel 3, a suction side casing 4 connected to both ends of the barrel 3 by flanges 35 and 36, and a discharge side casing 5. The barrel 3, the suction side casing 4, and the discharge side casing 5 are formed of a steel plate such as stainless steel. A suction side flange 37 for connecting to a suction side pipe (not shown) is fixed to the suction side casing 4, and a discharge for connecting to a discharge side pipe (not shown) is connected to the discharge side casing 5. A side flange 38 is fixed. A pump portion 10 disposed in a part of the barrel 3 and the suction side casing 4 is composed of two stages of impellers 11 and 12 and a suction side inner casing 13 that accommodates the impellers 11 and 12. .

  On the other hand, a discharge-side inner casing 14 is disposed in the discharge-side casing 5. The discharge-side inner casing 14 is connected to the outer peripheral side end portion of the discharge-side casing 5 that extends radially outward from the cylindrical portion 14a and has a cylindrical portion 14a having substantially the same diameter as the inner peripheral-side end portion of the discharge-side casing 5. It is comprised from the ring-shaped part 14b made. The check valve 25 is accommodated inside the cylindrical portion 14 a of the discharge-side inner casing 14.

  The diaphragm type pressure tank 15 includes a discharge casing 5, a discharge inner casing 14, and a diaphragm 16 disposed in a space surrounded by the discharge casing 5 and the discharge inner casing 14. It consists of and. A space surrounded by the discharge side casing 5 and the discharge side inner casing 14 can be formed by the diaphragm 16 into two chambers, that is, an air chamber 17 and a submerged chamber 18. A communication hole 14h is formed in the cylindrical portion 14a of the discharge-side inner casing 14, so that the liquid (water) that has passed through the check valve 25 can flow into the submerged chamber 18 through the communication hole 14h. It has become.

  FIG. 2 is a view for explaining the operating state of the diaphragm type pressure tank. As shown in FIG. 2, the chamber on the left side of the diaphragm 16 is an air chamber 17, in which pre-pressurized air is contained, and the diaphragm 16 is in an expanded state as indicated by a solid line A. When the pump device 1 performs a pressure accumulation operation in which pressure is accumulated in the diaphragm type pressure tank 15, the pressure water enters from the communication hole 14h, presses the diaphragm 16, compresses the air in the air chamber 17, and the diaphragm 16 is indicated by a two-dot chain line B As shown, the water immersion chamber 18 is contracted. Next, when the piping pressure is lowered, the precompressed air is expanded, the water in the submerged chamber 18 is pushed out from the communication hole 14h, and the diaphragm 16 is again in the state indicated by the solid line A. The pump device 1 can perform automatic water supply by repeating this operation.

  As shown in FIG. 1, on the upper surface of the motor unit 20, an inverter or driver 28 that controls the speed of the motor, and a control that performs a constant pump discharge pressure control or a constant estimated terminal pressure control in response to a signal from the pressure sensor 27. A portion 30 is provided. The control unit 30 stores the identification number unique to the pump and stores the data necessary for the operation control of the pump and the like, reads the data stored in the storage unit 31 and writes the data to the storage unit 31, In addition, input / output means 32 for exchanging various data with the outside is provided. The input / output means 32 includes a communication port 33, transmits data stored in the storage means 31 to a communication network or the like via the communication port 33, receives data from the communication network or the like via the communication port 33, and stores the data in the storage means 31. To write to. The input / output means 32 can transmit and receive to / from portable terminal devices such as PDAs, notebook computers, mobile phones, etc. For service personnel working on site, the operation status of the pump device 1 can be received, No special terminal equipment is required to store the maintenance performed in the pump device itself. The storage unit 31 includes a main storage unit attached to the pump device 1 and a small storage medium (memory card) attached to the pump device 1 in a detachable manner.

  The motor unit 20 is configured by an induction motor, a synchronous motor, or a DC motor. When the motor part 20 is comprised with a DC motor, since the power consumption for driving a pump is reduced, it is preferable. When a DC motor is used, a driver is used for the variable speed of the motor. As described above, the inverter or driver 28 for performing a speed change operation of the pump is integrally configured in the pump device 1. The inverter or driver 28 provided with a CPU includes means for outputting a pump operation signal and an alarm signal to the outside, and also includes a button for starting the pump operation.

In the driver circuit, the pump device is operated according to the loaded control program. That is, when the pump is driven according to the control program, the liquid (water) sucked from the pump suction port 2 _IN is boosted by the two-stage impellers 11 and 12, and between the pump casing 2 and the motor unit 20. discharged from the pump discharge port 2 _OUT through the check valve 25 through the annular flow passage 29. During the pump operation, for example, the pressure detected by the pressure sensor 27 is compared with the target pressure so that the set pressure value is obtained, and the constant speed control is performed by changing the rotational speed of the pump by the inverter or the driver 28. I do. This constant pressure control includes a constant pump discharge pressure control and a constant estimated terminal pressure control. When the amount of water used decreases, the pump device 1 is stopped. That is, when the amount of water used decreases, this is detected based on the pump rotation speed or by a separately provided flow switch, and after accumulating pressure in the diaphragm type pressure tank 15, the pump device 1 is stopped.

  The control program of this control unit can be rewritten by external communication means. Therefore, a control program corresponding to the site can be loaded into the apparatus by communication after being installed at the site, and the device can be shipped to the factory and delivered to the site without having to discuss detailed specifications in advance. It is convenient because the device can be moved according to the specifications determined in the subsequent customer meeting.

  Further, it is possible to easily cope with a change in the control operation, and the control program can be easily changed when a change in control due to secular change or a change in the usage environment of the customer occurs. This change can also be made from the network, so service personnel do not have to go to the site. Even if you want to change the program as a countermeasure to trouble, you can solve the trouble through the network without going to the site.

Since the set pressure value is too low, it is possible to increase the control target pressure without going to the site in case of trouble such as a small amount of water supply. Of course, the change by the general portable terminal device by the side of a machine is also possible.
In a device that frequently changes the control program, a program for partially rewriting the program can be created in the application portion. In this program, even if the device is in operation, an operation is programmed such that the device does not temporarily stop due to a change in the program.

FIG. 3 is a diagram showing a situation where a plurality of pump devices shown in FIG. 1 are installed. The plurality of pump devices 1 are installed at a predetermined site, for example, one pump chamber.
In the example shown in FIG. 3, the No. 1 pump device has a function of communicating with the outside through the web, and between the other pump devices (in FIG. 3, between No. 2 and No. 3 pump devices). They are connected by a communication means such as a field network or a wireless run that enables finer communication between devices in a limited area of the installation site. The storage means 31 (see FIG. 1) of each pump device 1 has an area for storing an identification number unique to the pump device. In addition, the number of pump devices of the same type installed at least, It has an area for storing the number of units that can be operated in parallel, the number of pump devices that are currently operating, and the number of pump devices that are malfunctioning. Thus, the plurality of pump devices 1 can perform additional pump disconnection, failure skipping operation, and alternate rotation operation while communicating between the pump devices using the stored information.

  If control is performed with the above-described configuration, the scale of water supply at the site increases, and it is convenient to add another pump device when it is desired to add another pump device. That is, by adding the pump device of the present invention and increasing the number of units by one, it is possible to easily install or remove the pump device by resetting the change point of the control program by communication as necessary. Become. Moreover, only one pump device communicates with the web, which is efficient.

  As described above, when a plurality of pump devices in one pump chamber or the like are wirelessly managed by a communication means such as a field network, data is transmitted / received in an environment where communication with the plurality of pump devices is connected. In order to establish communication with a specific pump device, a unique identification number of each pump device is used. However, if this identification number is unknown, it is necessary to first identify the correspondence between this identification number and the installed pump device.

  In order to solve this problem, a master number capable of establishing communication regardless of the identification number is determined in advance, and when this number is transmitted, the data of the pump device can be read regardless of the identification number. By means of communication with only a specific pump device, the pump device identification number can be confirmed first by connecting to one pump device by wire, or by using a master number for wireless communication or infrared communication with a narrow area. In addition, when data is sent simultaneously from a plurality of pump devices, the pump device that is actually installed is determined from the data of the sent identification numbers and the corresponding pump device name and serial number. Correspondence with the identification number used for communication can be taken. Once correspondence can be obtained, communication is performed thereafter using the identification number as a key.

  In addition, it is possible to control the pump device using data sent from other than the external pump device using communication input / output. For example, if you want to make the pressure at the faucet at the end of the building exactly constant, attach a pressure sensor with a communication function at the point where you want to make it constant, and this pump device controls the pressure constant by receiving the signal from the pressure sensor. Control may be set as follows.

  Furthermore, if a pressure sensor is attached to each pipe where you want to keep the pressure constant on each floor of the building, and equipped with water volume detection means that can determine whether or not water is being used, the floor that needs water is detected and It is also possible to supply water appropriately while changing the target pressure each time. If a sensor-specific identification signal is placed on the signals from these pressure sensors, it is possible to specify which sensor the signal is from on the pump device side.

  Even when pump devices to be controlled are distributed over a wide area, a certain degree of control operation can be performed through a network from a remote control room using communication means such as Ethernet (registered trademark). At this time, the operation order of the pump devices can be determined based on data sent from each pump device, and the pump device to be started next can be determined.

  The communication function of this pump device can also be used for maintenance. For example, if this pump device is stopped due to an alarm such as “overload” at the site, the communication data will immediately identify the corresponding portion of the overload in the instruction manual from the pump device identification number and “overload”. Since the display can be performed on the portable terminal or can be referred to by the remote monitoring terminal in the service headquarters, the response is quick.

In addition, when a data request for “trial operation” is made by communication at the time of trial operation installation of the pump device, guidance for a trial operation method for each pump can be displayed.
If this information is requested from a mobile phone, it is convenient if the tester can perform a test run according to a voice message, so that the maintenance staff performing the test run does not need to look at the screen and can work with both hands according to the guidance heard from the earphone. It is.

  FIG. 4 is a diagram showing an example in which three pump devices shown in FIG. 1 are installed in parallel. The configuration in which three pump devices shown in FIG. 4 are installed in parallel can be applied to a water supply device that is installed in an apartment house or a building and supplies water to each water supply end. As shown in FIG. 4, the three pump apparatuses 1 are provided, and each is connected in parallel. The suction side main pipe 41 of the pump device 1 is connected to a water main and a water receiving tank. The suction side main pipe 41 branches in three directions, and a suction side gate valve 42 is provided in each of the suction side pipes 41a, 41b, 41c. And each suction side piping 41a, 41b, 41c is connected to the suction side of each pump device 1.

  Also, each discharge side pipe 43a, 43b, 43c is connected to the discharge side of each pump device 1. Each discharge side pipe 43a, 43b, 43c is provided with a discharge side gate valve 44 with a check valve. Then, the three discharge side pipes 43 a, 43 b and 43 c are joined to the discharge side main pipe 45.

  In the water supply apparatus having the configuration shown in FIG. 4, based on signals from sensors mounted on each pump apparatus 1, variable speed operation of one pump apparatus when the demand water amount is small, 2 when the demand water amount is large The rotation speed control and the number control of the pumps can be performed in accordance with the situation such as the parallel operation of the pump devices and the additional disconnection of the pump devices.

  In FIGS. 1 to 4, an example in which the present invention is applied to a barreled motor pump has been described. However, the present invention is not limited to a barreled motor pump (canned motor pump), but also to a normal inline pump. Applicable.

  FIG. 5 is a sectional view showing an in-line pump which is another embodiment of the pump device of the present invention. As shown in FIG. 5, the pump device 51 includes a pump unit 60 provided in the pump casing 52 and a motor unit 70 that is provided outside the pump casing 52 and drives the pump unit 60. It is composed of an inline pump (line pump). The pump unit 60 includes an impeller 62 supported by a main shaft 61. The pump casing 52 is formed of a steel plate such as stainless steel, and the upper opening of the pump casing 52 is closed by a casing cover 53. The pump casing 52 is separated into a suction chamber 55 and a hydro casing chamber 56 by a partition plate 54, and the impeller 62 is disposed in the hydro casing chamber 56. A mechanical seal 63 is provided at a portion where the main shaft 61 supporting the impeller 62 passes through the casing cover 53.

The pump casing 52 is provided with a pump suction port 52 _IN communicating with the suction chamber 55 and a pump discharge port 52 _OUT communicating with the hydro casing chamber 56. Then, the pump suction port 52 _IN, and the suction-side flange 68 is provided for connection to the suction-side pipe (not shown), the pump discharge port 52 _OUT, the discharge side pipe (not shown) A discharge side flange 69 for connection is provided.

A plate-type check valve 65 is disposed near the outlet of the hydro casing chamber 56. Further, a pressure sensor 67 is attached to the pump casing 52 so that the discharge pressure of the fluid on the pump discharge side can be detected. On the other hand, a diaphragm pressure tank 75 formed integrally with the pump casing 52 is disposed on the pump discharge side. The diaphragm type pressure tank 75 is surrounded by the pump casing 52, the partition plate 54, the partition wall 52a extending from the bottom side of the pump casing 52 to the partition plate 54, the pump casing 52, the partition plate 54, and the partition wall 52a. And a diaphragm 76 disposed in the space. In the space surrounded by the pump casing 52, the partition plate 54, and the partition wall 52a, two chambers, that is, an air chamber 77 and a submerged chamber 78 can be formed by the diaphragm 76. The partition plate 54, the communication hole 54h in the vicinity of the pump discharge port 52 _OUT are formed, the liquid that has passed through the check valve 65 (water) can flow to the flooding chamber 78 through the communication hole 54h It is like that.

  The diaphragm type pressure tank 75 shown in FIG. 5 operates in the same manner as the diaphragm type pressure tank shown in FIG. That is, pre-compressed air is contained in the air chamber 77 and is in an expanded state. Then, when the pump device 51 performs a pressure accumulation operation for accumulating pressure in the diaphragm type pressure tank 75, the pressure water enters through the communication hole 54h, presses the diaphragm 76, compresses the air in the air chamber 77, and forms the water immersion chamber 78. Next, when the piping pressure is lowered, the precompressed air is expanded, the water in the submerged chamber 78 is pushed out from the communication hole 54h, and the diaphragm 76 is expanded again. The pump device 51 can perform automatic water supply by repeating this operation.

  Also in the pump device 51 shown in FIG. 5, on the side of the motor unit 70, an inverter or driver 88 that controls the speed of the motor, and a pump discharge pressure constant control or an estimated terminal pressure constant control in response to a signal from the pressure sensor 67. A control unit 90 is provided. The control unit 90 stores an identification number unique to the pump device and stores data necessary for operation control of the pump and the like, reads out data stored in the storage unit 91 and writes data into the storage unit 91. And input / output means 92 for exchanging various data with the outside. The input / output unit 92 includes a communication port 93, transmits data stored in the storage unit 91 to a communication network or the like via the communication port 93, and receives data from the communication network or the like via the communication port 93 and stores the data. To write to.

  The motor unit 70 is configured by an induction motor, a synchronous motor, or a DC motor. When the motor part 70 is comprised with a DC motor, since the power consumption for driving a pump is reduced, it is preferable. When a DC motor is used, a driver is used for the variable speed of the motor. As described above, the inverter or driver 88 for performing the speed change operation of the pump is integrally formed in the pump device 51. The inverter or driver 88 provided with a CPU includes means for outputting a pump operation signal and an alarm signal to the outside, and also includes a button for starting the pump operation. The control of the pump device 51 by the driver 88 and the control unit 90 is performed in the same manner as the pump device 1 shown in FIG.

It is sectional drawing which shows the barreled motor pump which is one Embodiment of the pump apparatus of this invention. It is a figure explaining the operating state of a diaphragm type pressure tank. It is a figure which shows the example which installed two or more pump apparatuses shown in FIG. It is a figure which shows the example which installed three pump apparatuses shown in FIG. 1 in parallel. It is sectional drawing which shows the in-line pump which is other embodiment of the pump apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,51 Pump device 2,52 Pump casing 2 _IN , 52 _IN pump suction port 2 _OUT , 52 _OUT pump discharge port 3 Barrel 4 Suction side casing 5 Discharge side casing 10, 60 Pump part 11, 12, 62 Impeller 13 Suction Side inner casing 14 Discharge side inner casing 14a Cylindrical portion 14b Ring-shaped portion 14h, 54h Communication hole 15, 75 Diaphragm pressure tank 16, 76 Diaphragm 17, 77 Air chamber 18, 78 Submerged chamber 20, 70 Motor portion 21, 61 Main shaft 25, 65 Check valve 27, 67 Pressure sensor 28, 88 Driver 29 Annular flow path 30, 90 Controller 31 Storage means 32 Input / output means 33 Communication port 35, 36 Flange 37, 68 Suction side flange 38, 69 Discharge side flange 41 Suction side main piping 41a, 41b, 41c Suction side piping 42 Write side gate valve 43a, 43b, 43c discharge side pipe 44 check valve with the discharge side gate valve 45 discharge side main pipe 52a partition wall 53 housing cover 54 partition plate 55 the suction chamber 56 hydro casing chamber 63 mechanical seal

Claims (12)

In a pump device in which a pump unit provided in a pump casing and having an impeller and a motor unit that rotationally drives the impeller are integrated,
A pressure tank for storing the liquid pressurized by the pump unit;
A pressure sensor for detecting the pressure of the liquid boosted by the pump unit;
A controller that receives the signal from the pressure sensor and operates the pump unit at a variable speed;
A part of the pump casing constitutes an outer shell of the pressure tank.   The pump device according to claim 1, wherein a check valve is provided in the pump casing.   The pump device according to claim 1, wherein the control unit includes a storage unit that stores data necessary for operation control of the pump device, and a communication unit that transmits and receives information to and from the outside.   The pump device according to claim 1, wherein the pressure sensor is attached to the pump casing.   5. The pump according to claim 1, wherein the pump device includes an inline pump in which the pump unit and the motor unit are integrally accommodated in the pump casing. apparatus.   The said pump apparatus is comprised from the in-line pump with which the said pump part provided in the said pump casing and the said motor part provided in the outer side of the said pump casing were integrated. The pump device according to any one of 1 to 4.   The pump device according to claim 3, wherein the control unit receives the signal from the pressure sensor and performs constant pump discharge pressure control or estimated terminal pressure constant control.   4. The pump device according to claim 3, wherein the storage means has an area for storing an identification number unique to the pump device.   The storage means stores at least the number of pump devices of the same type provided side by side, the number of pump devices of the same type that can be operated in parallel, the number of pump devices that are currently operating, and the number of pump devices that are malfunctioning. The pump device according to claim 3, wherein the pump device is provided.   The pump device according to claim 3, wherein the communication unit transmits and receives information to and from a pump device of the same kind provided side by side.   The pump device according to claim 3, wherein the communication unit can output information stored in the control unit to a terminal device.   The pump device according to claim 11, wherein the terminal device includes at least one of a personal computer, a PDA, and a mobile phone.

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