JP3471538B2 - Reciprocating pump system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating pump device system in which a plurality of reciprocating pump devices having the same number of stations are operated in parallel to increase a discharge flow rate.

[0002]

2. Description of the Related Art In a seawater desalination apparatus, a cleaning apparatus, and the like, in order to secure a large discharge amount, a plurality of small reciprocating reciprocating pump devices of the same size are used instead of one large reciprocating reciprocating pump device. May connect. FIG. 5 is a block diagram of a conventional reciprocating pump device system 10. The same elements as those of the embodiment of the invention described below are denoted by the same reference numerals, the description thereof will be omitted, and the main points will be described. Same triple reciprocating pump device 18
The a and 18b are equipped with three reciprocating pumps that are sequentially operated with a phase difference of 120 ° in crank angle. Identical electric motor 16
The a and 16b are provided corresponding to the respective triple reciprocating pump devices 18a and 18b, and are supplied with electric power from the starting board 12 and driven.
The rotational power of each electric motor 16a, 16b is the pulley 80, the V belt 82,
And is transmitted to the crankshaft 20 of the triple reciprocating pump device 18a, 18b via the pulley 84. The accumulator 86 is connected to each discharge pipe 36 and absorbs the pulsation of hydraulic pressure in each discharge pipe 36. The merging pipe 40 receives the pressure supply liquid tank 28 from each discharge pipe 36 via each check valve 38.

[0003]

In the conventional reciprocating pump device system 10, since the three reciprocating pump devices 18a and 18b are operated at any time without setting the operating phase relationship between them, Depending on the situation, the operating phases of the triple reciprocating pump devices 18a and 18b are aligned, that is, the operating phases of the reciprocating pumps of the triple reciprocating pump device 18a and the reciprocating pumps of the triple reciprocating pump device 18b are the same or It can get very close. In such a case, merge pipe 40
Since the fluctuation of the hydraulic pressure in the superimposition overlaps the fluctuation of the hydraulic pressure of each discharge pipe 36, the hydraulic pressure pulsation in the confluent pipe 40 greatly increases. Although each accumulator 86 is provided to alleviate this to some extent, it is structurally advantageous to omit the accumulator 86.

An object of the present invention is to equip an equal number of reciprocating pumps which are operated with equal phase difference, that is, to operate a plurality of reciprocating pump devices having the same number of stations in parallel, whereby the discharge flow rate is increased. In a reciprocating pump device system for increasing the discharge pressure, it is necessary to prevent the total discharge pressure fluctuation from increasing.

[0005]

According to the reciprocating pump device system (10) of the present invention, the multiple reciprocating pump devices (18a, 18b) having the same number of stations have the common input shaft (20) and the input Axis (20)
Therefore, a plurality of reciprocating pumps sequentially operated with an equal phase difference are provided. The multiple reciprocating pump devices (18a, 18b) are driven by the input shaft (20) so that all the reciprocating pumps in all the multiple reciprocating pump devices (18a, 18b) are sequentially operated with an equal phase difference. . Combined discharge part (40) is a full multiple reciprocating pump device.
It is provided as a place where the discharge fluid (30) from (18a, 18b) is collected and discharged.

Each of the multiple reciprocating pump devices (18a, 18b) has an input shaft (20) so that all the reciprocating pumps in the all multiple reciprocating pump devices (18a, 18b) are operated in sequence with an equal phase difference. Driven and discharge fluid from each multiple reciprocating pump device (18a, 18b) (3
0) is sent to the merge discharge part (40). All multiple reciprocating pump device
By operating all the reciprocating pumps in (18a, 18b) in order with an equal phase difference, the reciprocating pump device system (10) as a whole does not overlap the peaks or the bottoms of the discharge flow rates of the reciprocating pumps. , The peaks and / or the bottoms of the discharge flow rates of the reciprocating pumps appear in sequence with an equal phase difference, whereby the peaks or the bottoms of the discharge flow rates of the entire reciprocating pump device system (10) are leveled, that is, the reciprocating pumps. The average value of the total discharge flow rate of the pump system (10) is approached. In this way, while connecting a plurality of multiple reciprocating pump devices (18a, 18b) to increase the discharge flow rate,
Fluctuations in the discharge pressure of the reciprocating pump device system (10) can be reduced.

Another reciprocating pump device system (1
According to (0), a plurality of multiple reciprocating pump devices (18a, 18b)
Have their input shafts (20) connected to each other and receive rotational power from a common prime mover (16).

Each reciprocating pump has its input shafts (20) connected to each other and is driven by rotational power from a common prime mover (16), so that each reciprocating pump must be equipped with a prime mover (16). Is omitted. As a result, only one prime mover (16) is sufficient as a whole, and the number of prime movers (16) can be reduced.

Another reciprocating pump device system (1
According to 0), there are only two multi-way reciprocating pump devices (18a, 18b).

The operation order of the reciprocating pumps in the entire reciprocating pump device system (10) is as follows:
The reciprocating pump of 8a) and the reciprocating pump of the other multiple reciprocating pump device (18b) alternate.

Another reciprocating pump device system (1
According to 0), the rotating member (26) to which the rotational power from the prime mover (16) is transmitted is provided. Double multiple reciprocating pump device (18a, 1
The input shafts (20) of 8b) are defined in relative positions in the mutual rotation direction, and are connected to both sides of the rotation member (26).

Input shaft of both multiple reciprocating pump devices (18a, 18b)
(20) is connected to both sides of the rotating member (26), and the rotational power from the prime mover (16) is transmitted to each input shaft (20) via the rotating member (26). By setting the connecting position of each input shaft (20) to the rotating member (26) in the rotating direction, the double multiple reciprocating pump device (1
The operating phase between 8a and 18b) can be easily set.

Another reciprocating pump device system (1
According to 0), the accumulator (86) connected to the downstream side of the merged discharge part (40) is omitted.

Even if the accumulator (86) is omitted, the fluctuation of the discharge pressure of the reciprocating pump device system (10) is sufficiently reduced, so that there is a problem due to the fluctuation of the discharge pressure of the reciprocating pump device system (10). Can be ignored. In this way, the accumulator (86) can be omitted from the reciprocating pump device system (10) to simplify the configuration of the reciprocating pump device system (10).

[0015]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a reciprocating pump device system 10. Such a reciprocating pump device system 10 is installed in, for example, a seawater desalination device, a washing machine, or the like. The starter board 12 is connected to the AC power supply 14 and controls the operation of the electric motor 16. Each of the three reciprocating pump devices 18a and 18b having the same structure is provided with three reciprocating pumps which are sequentially driven by a common crankshaft 20 with a phase difference of 120 ° at a crank angle. They are arranged in line. The crankshaft 20 is connected to both sides of the pulley 26, and the rotational power of the electric motor 16 is transmitted to the pulley 26 via the pulley 22 and the V belt 24. The liquid supply tank 28 stores the liquid 30, and each of the triple reciprocating pump devices 18a and 18b sucks the liquid 30 in the liquid supply tank 28 through each strainer 32 and each suction pipe 34, and each discharge pipe 36. To discharge. The connection of the accumulator 86 (FIG. 5) in the conventional reciprocating pump device system 10 is omitted in each discharge pipe 36. Each discharge pipe 36 is connected to a common merging pipe 40, and each check valve 38 blocks the backflow of the liquid 30 from the merging pipe 40 to each check valve 38. The pressure gauge 42 measures the liquid pressure of each discharge pipe 36, and the pressure gauge 43 measures the liquid pressure of the merging pipe 40. The merging pipe 40 is connected to a pressure feeding pipe 48 via a relief valve 44. Relief valve
When the liquid pressure in the merging pipe 40 becomes excessive, 44 connects the merging pipe 40 to the bypass hose 46 and returns the liquid 30 in the merging pipe 40 to the liquid supply tank 28 via the bypass hose 46. In this way, the liquid 30 which has been prevented from excessive pressure rise by the relief valve 44,
It is sent to the pressure-feeding liquid utilization section 50 via the pressure-feeding pipe 48.

The general operation of the reciprocating pump device system 10 will be outlined. The electric motor 16 is operated at a predetermined speed by the starter board 12, and the rotational power of the electric motor 16 is transmitted via the pulley 26 to the triple reciprocating pump devices 18a, 18b. It is transmitted to the crankshaft 20. The triple reciprocating pump device 18a, 18b is provided from the liquid supply tank 28 to the liquid 30
Is inhaled and discharged to the discharge pipe 36. The liquids 30 discharged to the respective discharge pipes 36 merge in the merge pipe 40, and are further sent to the pressure-feeding liquid utilization section 50 via the pressure-feeding pipe 48.

FIG. 2 is a detailed view of the connecting structure of the pulley 26 and each crankshaft 20. The coupling 56 is applied to the pulley 26 on the side of the triple reciprocating pump device 18a. Both ends of each pin 58 are inserted into four holes formed in the mating surface portions of the pulley 26 and the coupling 56 at 90 ° intervals in the rotation direction of the pulley 26, so that the coupling 56 of the coupling 56 with respect to the pulley 26 is inserted. The position in the rotation direction is specified to a predetermined value. Buffer rubber 60 is pin 58
It is fitted and fixed in the gap between the hole of the pulley 26 and the hole of the pulley 26, and absorbs the misalignment between the pulley 26 and the coupling 56 and the uneven load applied to the pin 58. The hexagon nut 62 is screwed onto the exposed portion of the pin 58 from the coupling 56, so that the coupling 56 is attached to the pulley 26.
Tighten to. The crankshafts 20 of the triple reciprocating pump devices 18a, 18b are arranged on both sides of the pulley 26 with their center lines aligned with the center lines of the pulley 26 and the coupling 56, and the end portions of the crank shaft 20 of the coupling 56 and the pulley 26, respectively. It is inserted into the central hole. The keys 66 and 68 prevent relative rotation of the coupling 56 and the pulley 26 with respect to each crankshaft 20, and define the relative positions of the coupling 56 and the pulley 26 with respect to each crankshaft 20 in the rotational direction. The hexagon bolts 64 are screwed to the protrusions of the crankshafts 20 into the center holes of the coupling 56 and the pulley 26, and tighten the crankshafts 20 to the coupling 56 and the pulley 26.

FIG. 3 shows the relative positional relationship of the keys 66 and 68 in the rotational direction. The rotational positions of the holes of the pulley 26 and the coupling 56 into which the pin 58 is inserted are set so that the keys 66 and 68 are separated by 60 ° in the rotational direction of the pulley 26.
The keys 66 and 68 correspond to the rotation angle of 0 ° of each crankshaft 20 of the triple reciprocating pump device 18a and 18b, and the keys in the rotation direction are used.
As a result of the displacement of 66, 68 by 60 °, triple reciprocating pump device 18a
Is operated with a crank angle delayed by 60 ° from the triple reciprocating pump device 18b. As a result, in the reciprocating pump device system 10 as a whole, all the reciprocating pumps are operated in an operating order such that the reciprocating pumps of the triple reciprocating pump devices 18a and 18b alternate, and with an equal phase difference of 60 ° in crank angle. It

FIG. 4 shows changes in the discharge flow rate of the triple reciprocating pump devices 18a and 18b and the reciprocating pump device system 10 as a whole, while showing the changes in crank angle. The variation characteristic of the discharge flow rate is represented by the ratio q / qmeans of the discharge flow rate q at that time to the average discharge flow rate qmeans, and the characteristic graph of the entire triple reciprocating pump device 18b and the reciprocating pump device system 10 (each three The rotation angle in the characteristic diagram is the first from the top and the first from the bottom.)
It is the crank angle of 18b, and the rotation angle in the characteristic diagram of the triple reciprocating pump device 18a (the center one of the three characteristic diagram) is the rotation angle of the crankshaft 20 of the triple reciprocating pump device 18a. ing. In the discharge flow rate characteristics of the triple reciprocating pump devices 18a and 18b, the triple reciprocating pump devices 18a and 18b are arranged so that the peak phase of the other characteristic line comes exactly in the center of the adjacent peak phases of the one characteristic line. Since the operation is performed, in the characteristic line of the entire reciprocating pump device system 10, the fluctuation of q / qmeans is relaxed as compared with the case of the individual triple reciprocating pump devices 18a and 18b.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a reciprocating pump device system.

FIG. 2 is a detailed view of a coupling structure of a pulley and each crankshaft.

FIG. 3 is a diagram showing a relative positional relationship of keys in a rotation direction.

FIG. 4 is a diagram showing a change in the discharge flow rate in the triple reciprocating pump device and the entire reciprocating pump device system, while showing the changes in the crankshaft rotation angle.

FIG. 5 is a configuration diagram of a conventional reciprocating pump device system.

[Explanation of Codes] 10 Reciprocating Pump Device System 16 Electric Motor (Motor) 18a, 18b Triple Reciprocating Pump Device (Multiple Reciprocating Pump Device) 20 Crank Shaft (Input Shaft) 26 Pulley (Rotating Member) 30 Liquid (Discharge Fluid) 40 Confluence pipe (merging discharge part) 86 Accumulator

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Claims (2)

(57) [Claims] 1. Two multiple reciprocating pump devices (18a, 18b) having the same number of stations are sequentially operated by a common crankshaft (20) and the crankshaft (20) with an equal phase difference. A plurality of reciprocating pumps, the multiple reciprocating pump device (18a, 18b)
Is, so that all the reciprocating pumps in the all-reciprocating reciprocating pump device (18a, 18b) are sequentially operated with an equal phase difference, the crankshaft (20) is driven, and the merging discharge part (40) is A rotary member (26) is provided as a part for collecting and discharging the discharge fluid (30) from the all-reciprocating reciprocating pump device (18a, 18b) and transmitting the rotational power from the prime mover (16). , The crankshaft (20) of both multiple reciprocating pump device (18a, 18b),
Align their centerlines and align them on both sides of the rotating member (26).
Each of them is connected and the keys (66, 68) are
Corresponding to 0 ° rotation angle of each crankshaft (20) of the installation (18a, 18b)
The rotation member (26) relative to each crankshaft (20).
Prevents rotation and attaches to each crankshaft (20)
It defines the relative position of the rotating member (26) in the rotating direction.
Pump device system characterized by that. 2. The reciprocating pump device system according to claim 1, wherein an accumulator (86) connected to a downstream side of the merged discharge part (40) is omitted.