JPH059514Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of the air chamber structure of a multiple plunger pump with a suction unloader.

[Conventional technology]

Generally, a plunger pump with a suction unloader device uses a pressure switch to detect, for example, the pressure of water and air accumulated in an accumulator during operation.
The signal causes the pump to start or stop discharging via the controller. Then,
Since this discharge starts or stops in a short time of 1/100 to 20/100 seconds, the suction air chamber of a plunger pump, where water and air are stored, has a capacity compensation function (i.e., suction line The water hammer absorption function (i.e., the pump starts discharging water more rapidly than when the flow has stopped) and the water hammer absorption function (i.e., the pump starts discharging water more rapidly than when the flow has stopped). When the discharge is stopped, the suction line also stops at the specified flow rate at the same time.It is necessary to have a function to absorb the water hammer that occurs at that time.

Conventionally, as shown in FIGS. 4 and 5, for example, a vertical type 7 with a suction unloader device (not shown) is used.
The continuous plunger pump 1 includes a cylinder portion 2 in the shape of a horizontally long rectangular body, and a suction manifold that sucks water from two left and right suction lines 3 and 4 through vertical suction air chambers 5 and 6, respectively. 7, and suction valves 8a, 8b, 8c, 8 each consisting of a valve restrained by the suction unloader device arranged in seven series in parallel.
d, 8e, 8f, 8g, and a plunger 9a extending upward from a position adjacent to the suction valves 8a to 8g and reciprocatingly moved by a crank mechanism to discharge water at high pressure.
9b, 9c, 9d, 9e, 9f, 9g, and discharge valves 10a, 10 that discharge water that has become high pressure due to the successive lowering of the plungers 9a to 9g.
b, 10c, 10d, 10e, 10f, 10g
and a discharge manifold 11 connected to a discharge line 12 so as to force-feed an accurate discharge flow rate.

[Problem that the invention attempts to solve]

The discharge of a plunger pump is not started or stopped by a predetermined plunger; for example, in the case of a seven-unit plunger pump, discharge can be started or stopped by any of the plungers 9a to 9g. The relationship between the conventional suction air chamber and the cylinder section of a 7-plunger pump is that the suction air chambers are attached to both sides of the cylinder section, and the distance between each plunger and the suction air chamber varies for each plunger. The pressure drop value within the suction manifold differs depending on which plunger starts discharging first upon receiving a signal from a pressure switch such as an accumulator or the like. That is, as shown in FIG. 6, when pressure feeding is started from the plunger closest to the suction air chambers 3 and 4, the pressure drop value is small, and when pressure feeding is started from the farthest plunger, the pressure drop value is large. The suction condition is the worst in areas where this pressure drop value is large, and there is a risk that cavitation or piping vibration may occur, which may exceed the capacity of the suction air chamber's capacity compensation function and water hammer absorption function. Ta.

This invention was proposed in order to solve the problem in view of the above circumstances, and the distance between the suction air chamber and each plunger is made as short and equal as possible, so that no matter which plunger starts discharge, the suction manifold It is an object of the present invention to provide a suction air chamber in which the pressure drop values within the suction air chamber are small and equal.

[Means for solving problems and their effects]

In order to solve the above problems, the present invention provides a multiple plunger pump with a suction unloader having a suction air chamber, in which the suction air chamber is horizontally integrated directly above the suction manifold of the cylinder section, and each plunger and suction The suction air chamber and the suction manifold are connected to the air chamber by a plurality of branch pipes so that the suction air chamber and the suction manifold communicate with each other at each suction valve position, and the distance between each branch pipe is equal, so that the discharge is started from which plunger. It is characterized by a small and equal pressure drop value in the suction manifold.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a plan view of the vertical seven-unit plunger pump of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a pressure drop distribution diagram within the suction manifold of the seven-unit plunger pump. Components that are the same as those in FIGS. 4 to 6 are given the same reference numerals, and explanations thereof will be omitted.

The suction air chamber 13 of the 7-unit plunger pump 1 with a suction unloader of the present invention is provided in a rectangular shape and horizontally integrated directly above the suction manifold 7 of the cylinder part 2, and has a volume similar to that of the conventional vertical suction air chamber 5.
Equal to the sum of 6. And each plunger 9a-9
g, branch pipes 14a, 14b, 14c,
Connected by 14d, 14e, 14f, and 14g. These branch pipes 14a to 14g have the same size and are connected to the suction manifold 7 so as to communicate with each other at the positions of the respective suction valves 8a to 8g. As a result, the distances between the suction air chamber 13 and each of the plungers 9a to 9g are shorter and more equal than in the past. Note that 3 and 4 are suction lines, 10a to 10g are discharge valves, 11 is a discharge manifold, and 12 is a discharge line.

With this configuration, the pressure drop value of the suction manifold 7 is small as shown in FIG. 3, and is all equal regardless of the discharge order of the plungers 9a to 9g. Therefore, the suction condition becomes uniform and no cavitation or piping vibration occurs, so that the capacity compensation function and water hammer absorption function of the suction air chamber 13 can be fully demonstrated.

[Effect of idea]

As explained above, the present invention provides a multi-plunger pump with a suction unloader having a suction air chamber, in which the suction air chamber is horizontally integrated directly above the suction manifold in the cylinder section, and the shortest distance between each plunger and the branch pipe is achieved. In addition, since they are connected at equal distances, the pressure drop in the suction manifold is small and can be made equal regardless of the order of discharge of the plungers, which improves the capacity compensation function and water hammer prevention function of the suction air chamber. It produces the effect that can be fully demonstrated.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the 7-plunger pump of the present invention, Fig. 2 is a front view of the same, and Fig. 3 is a 7-plunger pump of the present invention.
A pressure drop distribution diagram in the suction manifold of a continuous plunger pump, Figure 4 is a plan view of a conventional 7-unit plunger pump, Figure 5 is a front view of the same, and Figure 6 is a diagram of the pressure drop distribution inside the suction manifold of a conventional 7-unit plunger pump. It is a pressure drop distribution map. 1... 7-unit plunger pump, 2... Cylinder section, 3, 4... Suction line, 5, 6... Suction air chamber, 7... Suction manifold, 8a to 8g... Suction valve, 9a to 9g... Plunger, 10a-10
g...Discharge valve, 11...Discharge manifold, 12
...Discharge line, 13...Suction air chamber, 14a~
14g...branch pipe.

Claims (1)

[Scope of utility model registration request] In a multi-plunger pump with a suction unloader having a suction air chamber, the suction air chamber is horizontally integrated directly above the suction manifold of the cylinder part, and each plunger and the suction air chamber are connected to each other by a plurality of branch pipes. A multiple plunger pump with a suction unloader, characterized in that a suction manifold and a suction manifold are connected so that they communicate with each other at each suction valve position and the distances between the branch pipes are equal.