JP2007205309A - Reciprocating pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reciprocating pump which conveys a proper amount of fluid as needed while conveying the fluid regularly. <P>SOLUTION: In this reciprocating pump, a drive part 40 is driven with a drive pulse signal 6, internal pulse signals 1 are generated at predetermined time intervals for regular driving, and irregular external pulse signals 2 are input therein. A count means 30 receives both the internal pulse signals 1 and the external pulse signals 2, and counts them as unitary counted values according to the internal pulse signals 1 and the external pulse signals 2. A monitoring means 50 monitors the counted values at time intervals corresponding to the minimum stroke cycle of the reciprocating motion of the drive part 40. When the counted value meeting predetermined requirements is present when the monitoring means 50 monitors the counted values, the drive pulse signals 6 are generated, and the counted values meeting the predetermined requirements are deducted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reciprocating pump, and more specifically to a reciprocating pump in which a drive unit is driven based on a driving pulse signal.

  Conventionally, in order to maintain a constant property of a fluid such as a liquid circulating in a circulation system or a liquid existing in a liquid tank (hereinafter referred to as “target fluid”), A fluid transport mechanism for injecting fluid is used. In such a fluid conveyance mechanism, a reciprocating pump suitable for quantitative conveyance of fluid is used, and the reciprocating pump is driven based on a drive pulse signal generated at regular intervals according to an appropriately set conveyance amount. The part is driven.

  Further, in such a fluid transport mechanism, even if the property of the target fluid suddenly changes for some reason, the fluid can be transported to inject a chemical solution or the like correspondingly, An auxiliary pump is provided separately from the reciprocating pump. Such an auxiliary pump is connected to a measuring device for measuring the property of the target fluid, for example, and is automatically driven when a change in the property of the target fluid is confirmed, or manually driven based on human judgment. It is something to be done.

  However, if a separate auxiliary pump is provided after providing a reciprocating pump for quantitatively conveying the fluid, the configuration of the fluid conveying mechanism becomes complicated and the cost increases. In addition, since the auxiliary pump does not always operate, there is a problem that the fluid conveyance mechanism becomes wasteful.

  Therefore, an object of the present invention is to provide a reciprocating pump capable of conveying a proper amount of fluid as needed, while being able to steadily convey a fluid. It is an object of the present invention to simplify the configuration of the fluid transport mechanism to reduce costs and reduce waste.

  A reciprocating pump according to the present invention is a reciprocating pump in which a driving unit is driven based on a driving pulse signal, and generates an internal pulse signal at regular intervals to drive the driving unit constantly. A signal generation means; an external pulse signal input means to which an external pulse signal generated non-stationarily based on an external operation is input; and both the internal pulse signal and the external pulse signal are received, and the internal pulse signal and the external pulse are received. Counting means for adding as a unitary count value according to the signal, monitoring means for monitoring the count value every time corresponding to the minimum stroke cycle of the reciprocating motion of the driving unit, and a driving pulse signal for generating a driving pulse signal Generating means, and when there is a count value that meets a predetermined condition when the monitoring means monitors the count value, the drive pulse Together with the signal is generated, characterized in that it is configured to subtract the adapted the count value to the predetermined condition.

  According to the reciprocating pump having the above-described configuration, the drive unit is steadily driven by an internal pulse signal generated at regular intervals. When it is necessary to increase the transport amount, an external pulse signal is input unsteadyly by an external operation, either automatically or manually, and reflected in the drive of the drive unit. Further, in this reciprocating pump, when there is a count value that meets a predetermined condition, the drive pulse signal is output at every time corresponding to the minimum stroke cycle of the reciprocating motion until the count value becomes a value that does not meet the predetermined condition. Is generated, and the driving unit is driven. By the way, in this reciprocating pump, the internal pulse signal and the external pulse signal are centrally replaced and added as a count value corresponding thereto, and the drive pulse signal is generated based on the count value. Even if the external pulse signal competes, the internal pulse signal or the external pulse signal can be reliably reflected in the driving of the driving unit without loss. The predetermined condition is, for example, whether or not there is a count value when one drive pulse signal is generated for one count value, and for example, two or more predetermined numbers. When one drive pulse signal is generated for the count value, it is whether or not there are more than the predetermined number of count values.

  As described above, according to the reciprocating pump according to the present invention, the function of conveying the fluid quantitatively and the function of conveying the fluid in addition to the function are integrated into one, and the fluid can be conveyed constantly. Although it is possible, an appropriate amount of fluid can be conveyed as required. Therefore, it is possible to simplify the configuration of the fluid conveyance mechanism in which the reciprocating pump according to the present invention is incorporated, thereby reducing costs and reducing waste.

  Hereinafter, an embodiment of a reciprocating pump according to the present invention will be described with reference to the drawings.

  The reciprocating pump according to the present embodiment is designed to maintain a constant property of a fluid such as a liquid circulating in a circulation system or a liquid existing in a liquid tank (hereinafter referred to as “target fluid”). Thus, it is incorporated into a fluid transport mechanism that constantly injects fluid such as a chemical solution. In addition to the reciprocating pump, the fluid transport mechanism is provided with a measuring device for measuring the property of the target fluid, for example.

  Specifically, as shown in FIG. 1, the reciprocating pump according to the present embodiment includes an internal pulse signal generation means 10 that generates an internal pulse signal 1 at regular intervals, and a non-stationary operation based on an external operation. The external pulse signal input means 20 to which the generated external pulse signal 2 is input and both the internal pulse signal 1 and the external pulse signal 2 are accepted, and as a unified count value corresponding to the internal pulse signal and the external pulse signal The counting means 30 for adding, the monitoring means 50 for monitoring the count value every time corresponding to the minimum stroke period Tmin of the reciprocating movement of the driving section 40, and the driving pulse signal for generating the driving pulse signal 6 for driving the driving section 40 Generating means 60. Then, when there is a count value that meets a predetermined condition when the monitoring means monitors the count value, the drive pulse signal 6 is generated and the count value that meets the predetermined condition is subtracted. It is composed. The drive unit 40 is driven based on the drive pulse signal 6.

  The reciprocating pump according to the present embodiment is configured so that the stroke period T of the reciprocating motion is variable, and the built-in drive unit 40 can be driven at a maximum of about 300 times per minute, for example. The minimum stroke period Tmin of the drive unit 40 is 0.2 seconds when the drive unit 40 has a performance capable of driving up to 300 times per minute. The minimum stroke cycle Tmin of the drive unit 40 is set near the upper limit value of the stroke cycle that can be realized in the mechanical structure of the reciprocating pump. Specifically, the reciprocating pump is a so-called solenoid pump, and the driving unit 40 is electromagnetically driven by an electromagnet. Further, the stroke period T of the reciprocating motion can be adjusted by operating a control panel or the like provided in the main body of the reciprocating pump.

  The counting unit 30 and the monitoring unit 50 are provided in a first control unit 100 such as a CPU, and the drive pulse signal generation unit 60 is a second control unit such as a CPU built in a reciprocating pump. 200. However, each means does not need to be provided in a separate control unit, and may be provided integrally in one control unit, and each of the control units 100 and 200 is a reciprocating pump. These may be built in, or may be provided outside the reciprocating pump. The control unit can also be configured by a logic circuit.

  The internal pulse signal generating means 10 generates the internal pulse signal 1 at regular intervals that coincide with the stroke period T in order to drive the driving unit 40 in a steady manner. The stroke cycle T is set longer than the minimum stroke cycle Tmin determined based on the performance of the drive unit 40. For example, the stroke period T is set to 0.3 seconds, and in this case, the reciprocating pump is driven 200 times per minute. The generated internal pulse signal 1 is provided to the counting means 30.

  The external pulse signal input means 20 is a so-called interface to which an external pulse signal 2 generated based on an external operation is input. The external pulse signal 2 is provided from the external pulse signal generation means 70, and is automatically or manually generated by the external pulse signal generation means 70. The external pulse signal 2 generated by the external pulse signal generation means 70 is provided to the counting means 30 via the external pulse signal input means 20. Specifically, when the external pulse signal 2 is in a format that can be directly processed by the counting means 30, the external pulse signal input means 20 functions as a relay terminal that allows the external pulse signal 2 to pass through. When the external pulse signal 2 has a format that cannot be directly processed by the counting means 30, the external pulse signal input means 20 converts the external pulse signal 2 into a format that can be directly processed by the counting means 30. Have Further, a plurality of external pulse signal input means 20 are provided and can receive the external pulse signal 2 respectively.

  The external pulse signal generating means 70 is, for example, a measuring device provided in the fluid transport mechanism as described above. For example, the measurement device can measure the concentration of a specific component contained in the target fluid and detect a change in concentration. Then, it is possible to calculate the amount of a fluid such as a chemical solution necessary for canceling the concentration change. Furthermore, it is possible to calculate the number of times of driving the reciprocating pump necessary for conveying the calculated amount. The external pulse signal 2 is generated based on these calculation results. Specifically, two external pulse signal generation means 70 are provided (hereinafter referred to as “first external pulse signal generation means 71” and “second external pulse signal generation means 72”, respectively).

  The counting means 30 adds a count value according to the internal pulse signal 1 and the external pulse signal 2. Specifically, the counting means 30 adds (increments) one internal pulse signal 1 or external pulse signal 2 as one count value, and each time one internal pulse signal 1 or external pulse signal 2 is provided. Increase the count value by one. Further, one drive pulse signal 6 is subtracted (decremented) as one count value, that is, every time the drive pulse signal generating means 60 generates one drive pulse signal 6, the count value is decreased by one.

  The monitoring means 50 monitors the count value at regular intervals that coincide with the minimum stroke period Tmin of the drive unit 40. Specifically, the count value is monitored every 0.2 seconds.

  The drive pulse signal generation means 60 generates a drive pulse signal 6, and the generated drive pulse signal 6 is provided to the drive unit 40 to drive the drive unit 40 once (for one stroke).

  Next, the operation of the reciprocating pump configured as described above will be described with reference to FIG. The predetermined condition is whether or not a count value exists because one drive pulse signal 6 is generated for one count value.

  First, at time t0, the internal pulse signal 1 is generated by the internal pulse signal generation means 10, the count means 30 adds one count value, and the count value increases from 0 to 1. Thereafter, the monitoring means 50 monitors the count value at time t1, and since the count value is 1, the count value conforms to a condition necessary for generating the drive pulse signal 6, so that the drive pulse signal generation means The drive pulse signal 6 is generated by 60, and the drive unit 40 is driven once. Then, the counting means 30 subtracts one count value, and the count value decreases from 1 to 0.

  Next, at time t2, the monitoring unit 50 monitors the count value. Since the count value is 0, the count value does not meet the conditions necessary for generating the drive pulse signal 6, and therefore the drive pulse The signal 6 is not generated and the driving unit 40 is not driven.

  At time t3, the external pulse signal 21 generated by the first external pulse signal generation means 71 is input to the external pulse signal input means 20, and the count means 30 adds one count value, and the count value is Increase from 0 to 1. At time t4, internal pulse signal 1 is generated by internal pulse signal generation means 10, one count value is added to the count means, and the count value increases from 1 to 2. Further, at time t5, the external pulse signal 21 generated by the first external pulse signal generation means 71 is input to the external pulse signal input means 20, and the counting means 30 adds one more count value to count The value increases from 2 to 3.

  Thereafter, at time t6, the monitoring unit 50 monitors the count value, and since the count value is 3, the count value meets the conditions necessary for generating the drive pulse signal 6, so that the drive pulse signal generation unit The drive pulse signal 6 is generated by 60, and the drive unit 40 is driven once. Then, the counting means 30 subtracts one count value, and the count value is decreased from 3 to 2.

  At time t7, the external pulse signal 22 generated by the second external pulse signal generation means 72 is input to the external pulse signal input means 20, but the reciprocating pump is operated by the first external pulse signal as described above. The same operation as when the external pulse signal 21 generated by the generating means 71 is input is performed.

  As described above, in the reciprocating pump according to the present embodiment, the driving unit is driven in such a manner that the external pulse signal is processed between the internal pulse signals generated every predetermined time.

  As described above, according to the reciprocating pump according to the present embodiment, the driving unit 40 is steadily driven by the internal pulse signal 1 generated at regular intervals. Then, when it is necessary to increase the transport amount, the external pulse signal 2 is input non-stationarily by an external operation, and the count value is incremented by one and reflected in the drive of the drive unit 40. Further, in this reciprocating pump, when there is a count value, the drive pulse signal 6 is generated at fixed time intervals that coincide with the minimum stroke period Tmin of the drive unit 40 until the count value becomes zero, and the drive is driven. The unit 40 is driven. Furthermore, in this reciprocating pump, since the internal pulse signal 1 and the external pulse signal 2 are replaced and added as a count value corresponding to this, the drive pulse signal 6 is generated based on the count value. Even if the pulse signal 1 and the external pulse signal 2 compete with each other, the drive unit 40 can be reliably driven by these signals without losing any of them.

  As described above, in the reciprocating pump according to the present embodiment, the function of conveying the fluid quantitatively and the function of conveying the fluid in addition to the functions are integrated, and the fluid can be steadily conveyed, but is necessary. Accordingly, an appropriate amount of fluid can be conveyed. Therefore, it is possible to simplify the configuration of the fluid conveyance mechanism in which the reciprocating pump according to this embodiment is incorporated, thereby reducing costs and reducing waste.

  The reciprocating pump according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the counting means 30 has been described as adding one external pulse signal 2 as one count value. However, the present invention is not limited to this, and a plurality of external pulse signals 2, 2,. One count value may be added every time. Similarly, the counting means 30 has been described as subtracting one drive pulse signal 6 as one count value. However, the present invention is not limited to this, and the count value is calculated for each of a plurality of drive pulse signals 6, 6,. One may be subtracted. That is, each signal and the count value are not limited to those corresponding to 1: 1, and each signal and the count value may correspond at an arbitrary ratio. Further, the ratio between the signal and the count value may be different for each signal according to the attribute of each signal. Further, the subtraction of the count value may be performed by a control means provided separately.

  Moreover, although the said monitoring means 50 demonstrated as what monitors a count value for every fixed time which corresponds to the minimum stroke period Tmin of the said drive part 40, it is not limited to this, It respond | corresponds to the minimum stroke period Tmin. The count value may be monitored every time (for example, every time twice the minimum stroke period Tmin).

  The external pulse signal 2 has been described as being automatically generated from the external pulse signal generation means 70, but is not limited to this, and an external pulse signal provided separately as the external pulse signal generation means 70. It may be generated manually by manually pressing the 2 outgoing switch.

  Further, the external pulse signal generation means 70 has been described as a measuring device provided in a fluid conveyance mechanism separately from the reciprocating pump, but is not limited to this, and is integrated with the main body of the reciprocating pump. It may be provided. That is, the external pulse signal generating means 70 is not intended to be physically provided outside the reciprocating pump, but is intended to generate an unsteady pulse signal. 10 is distinguished.

  As described above, the reciprocating pump according to the present invention steadily applies to the target fluid in order to maintain the properties of the target fluid such as the liquid circulating in the circulation system and the liquid existing in the liquid tank. It is useful in fluid transport mechanisms that inject fluids such as chemicals, and in particular, in the field of air conditioner systems using cooling towers, a treatment agent is injected to maintain the properties of the liquid circulating in the air conditioner system constant. Useful in fluid transport mechanisms.

  More specifically, the processing agent is injected into the liquid circulating in the air conditioner system at a constant concentration in order to prevent damage to the devices constituting the air conditioner system and to operate normally. However, in such an air conditioner system, the treatment agent is lost as the circulating liquid evaporates or scatters in the cooling tower. In addition, when the liquid quality exceeds a certain standard, such as when the electrical conductivity of the circulating liquid changes due to an increase in impurities, water replacement called blow is performed, and the treatment agent is also lost at this time. To do. As described above, since the concentration of the processing agent in the circulating liquid changes irregularly, in the air conditioner system using the cooling tower, while constantly injecting the processing agent, the change in the properties of the circulating liquid follows. Therefore, the reciprocating pump according to the present invention in which the injection amount can be appropriately changed is very useful.

The block diagram of the reciprocating pump which concerns on embodiment of this invention is shown. The time chart explaining operation | movement of the reciprocating pump which concerns on the embodiment is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Internal pulse signal, 2 ... External pulse signal, 6 ... Drive pulse signal, 10 ... Internal pulse signal generation means, 20 ... External pulse signal input means, 30 ... Count means, 40 ... Drive part, 50 ... Monitoring means, 60 ... Drive pulse signal generating means, 70 ... External pulse signal generating means, 100 ... First control section, 200 ... Second control section

Claims (1)

A reciprocating pump in which a drive unit is driven based on a drive pulse signal,
An internal pulse signal generating means for generating an internal pulse signal at regular intervals to drive the driving unit steadily;
An external pulse signal input means for inputting an external pulse signal generated non-stationarily based on an external operation;
A counting means for accepting both the internal pulse signal and the external pulse signal, and adding as a unified count value according to the internal pulse signal and the external pulse signal;
Monitoring means for monitoring the count value every time corresponding to the minimum stroke cycle of the reciprocating motion of the drive unit;
Drive pulse signal generating means for generating a drive pulse signal,
When the monitoring means monitors the count value, and there is a count value that meets a predetermined condition, the drive pulse signal is generated and the count value that meets the predetermined condition is subtracted. A reciprocating pump characterized by that.

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