JPS6316590B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge flow rate regulating valve in a multiple reciprocating pump, which is often used in applications requiring high pressure, such as boiler water supply or water pressure machines. The present invention is characterized in that the flow rate and pressure in a plurality of cylinders in the pump can be adjusted simultaneously, and the total discharge amount of the entire pump can be changed.

When using conventional multiple reciprocating pumps of this type to supply boiler water, it is possible to control the water temperature and obtain hot water, but in order to obtain steam in addition to water and hot water, A separate dedicated machine was required, and if steam was to be generated by high-pressure injection, a safety device was required, resulting in a fairly large structure and the need for thorough maintenance.

This invention was made in view of the above circumstances,
The adjustment valve installed on the discharge side of a multiple reciprocating pump simultaneously converts the flow rate and pressure in the two cylinders into an appropriately set flow rate and pressure without going through the pump's discharge valve, and adjusts the total discharge volume of the entire pump as required. In addition to controlling the water temperature according to the
The object of the present invention is to provide a flow rate regulating valve for a multiple reciprocating pump, which is characterized in that water, hot water, and steam can be obtained in one unit.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a cross-sectional view of a triple reciprocating pump equipped with the flow rate regulating valve of the present invention.
A crankshaft 4 connected to a drive source (not shown) is rotatably disposed on the driving part 1, and a piston 6 projects into the pump part 2 via a crank 5 attached to the crankshaft 4.
are connected in parallel to each other, so that each piston 6 can slide in three cylinders 7 arranged side by side in the pump part 2.

Each cylinder 7 has a suction port 8 on its tip side.
and a discharge port 9 are in communication with each other, and a suction valve 12 and a discharge valve 13 are provided in each passage 10 and 11, respectively.
is provided, and the fluid sucked from the suction port 8 as the piston 6 reciprocates is supplied from the discharge port 9 to a predetermined boiler or the like (not shown) via the suction valve 12 and the discharge valve 13. It's becoming like that.

The first and second cylinders (hereinafter referred to as 7 ₁ and 7 ₂ ) in the reciprocating pump 3 configured as described above
The flow rate regulating valve 14 of the present invention is installed on the discharge side of the
is installed, and the flow rate regulating valve 14 is configured so that the amount of fluid in the first and second cylinders 7 ₁ and 7 ₂ can be controlled by a mechanism described below. That is, as shown in FIG. 2, passages 16 1 and ₁₆ have orifices 15 ₁ and 15 ₂ on the discharge sides of the first cylinder 7 ₁ and the second cylinder 7 ₂ , respectively.
16 ₂ and fixing screw 17 to the reciprocating pump 3
The regulating valve body 18 is fixed with a first passage 19 that communicates with each of the passages 16 ₁ and 16 ₂ .
₁ , the second passage 19 ₂ and both passages 19 ₁ , 1
A multi-stage cylinder chamber 20 communicating with 9 ₂ , this multi-stage cylinder chamber 20 and the suction port 8 of the reciprocating pump 3
In this case, a multi-stage cylinder chamber 20 formed coaxially with the first passage ₁₉₁ is opened to the outside, and a threaded portion 22 formed in the opening is formed. A needle valve 23 screwed to the multi-stage cylinder chamber 20
A valve seat portion 24 and a needle valve 23 are seated on a small-diameter stepped portion of the multi-stage cylinder chamber 20, which protrudes movably into the cylinder and is located between the first passage ₁₉₁ and the bypass passage 21. A cylindrical conical valve ₂₆ which is slidably fitted on the valve shaft 23a of the needle valve 23, and a first control section 251 that connects the second passage ₁₉₂ and the bypass passage 21 is formed. The multi-stage cylinder chamber 2 located between the bypass passage 21
A second control portion 25 ₂ is formed on which the valve seat portion 27 formed in the large-diameter stepped portion of 0 can be seated. In this case, the cylindrical conical valve 26 has an elastic means, that is, a coil spring 28, which is compressed between the large-diameter side surface and the flange portion 23b formed on the valve shaft 23a.
The elastic force of the needle valve 23 allows it to sit on the valve seat 27 at all times.
The handle portion 23d is adapted to be able to engage with a ring-shaped engagement protrusion 29 that is fitted into the regulator valve body 3c and protrudes outward, and is attached to the needle valve 23 that protrudes outward from the regulating valve main body 18. When the needle valve 23 is opened from the valve seat part 24 by the operation, the cylindrical conical valve 26 can also be opened from the valve seat part 27 with a certain delay due to the engagement protrusion 29.

The handle portion 23d has a substantially U-shaped cross section, is attached to cover a portion of the regulating valve body 18, and has a retaining pin 30 projecting inward from one side of the handle portion 23d. is engaged in a circumferential groove 31 provided in the regulating valve body 18, thereby preventing the needle valve 23 from coming off. Further, a packing 32 is interposed between the needle valve 23 and the multi-stage cylinder chamber 20 to prevent fluid from leaking to the outside, and furthermore, a packing 32 is interposed between the needle valve 23 and the multi-stage cylinder chamber 20 to prevent fluid from leaking to the outside. Similarly, packing 33 is interposed in the sliding portion to maintain watertightness.

In the flow rate regulating valve of the present invention configured as described above, when the needle valve 23 is rotated with the handle portion 23d and the needle valve 23 and the valve seat portion 24 are slightly opened, the inside of the first cylinder 7 ₁ is opened. As shown in FIG. 3, the fluid flows through the first passage 19 1 through the passage 16 ₁ and the orifice 15 ₁ , and further passes through the first control section _{25 1 of} the multi-stage cylinder chamber 20 to the bypass passage 21. Since the fluid flows and returns to the suction port 8 side of the pump, the flow rate and pressure of the fluid in the first cylinder ₇₁ can be adjusted, and the total discharge flow rate of the pump can be controlled. In order to further control the discharge flow rate, the handle portion 2
3d to separate the needle valve 23 and the valve seat part 24, and the engaging protrusion 29 to the cylindrical conical valve 2.
By engaging the conical valve 26 with the valve seat 27 against the elastic force of the coil spring 28, the fluid in the second cylinder ₇₂ flows into the first cylinder 7. ₁ flows into the second passage 19 2 through the passage 16 ₂ and the orifice 15 ₂ , and from the bypass passage through the second control part _{25 2 of} the multi-stage cylinder chamber 20. Back to the side, the fluid flow rate and pressure in the second cylinder ₇₂ can also be adjusted to further control the total pump output flow rate. Therefore, in a state where the first and second control sections 25 ₁ and 25 2 are opened to control the discharge flow rate, the third control section 25 1 and 25 ₂ are opened to control the discharge flow rate.
the total flow rate of fluid in the cylinder (not shown) and the first
and the first and second cylinders 7 other than those returned to the suction port 8 side via the second control units 25 ₁ and 25 ₂
The sum of the fluid discharge flow rates in ₁ and 7 ₂ becomes the total discharge flow rate in the pump.

As explained above, according to the flow rate regulating valve of the present invention, the discharge flow rate is controlled by returning the fluid in two cylinders of the multiple reciprocating pump to the suction port side without going through the discharge valve. In addition, the operation of returning the fluid to the suction port side of both cylinders can be performed using the handle of the same needle valve, which not only makes the operation easy but also allows the overall size to be reduced. When used for boiler water supply, it is possible to generate water, hot water, and steam in one unit, and the safety of steam generation can be improved by reducing pressure due to changes in discharge flow rate. Excellent effects such as being able to be obtained,
Its utility value is remarkable.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a multiple reciprocating pump equipped with the fluid adjustment valve of the present invention, Fig. 2 is a plan view showing the main parts in cross section, and Figs. 3 and 4 are separate from each other. FIG. In the figure, 3...multiple reciprocating pump, 7 ₁ ...
...First cylinder, 7 ₂ ...Second cylinder, 8
... Suction port, 9 ... Discharge port, 12 ... Suction valve, 1
3...Discharge valve, 15 ₁ , 15 ₂ ...Orifice, 1
6 ₁ , 16 ₂ ... Passage, 18 ... Regulating valve body, 19
₁ ...First passage, 19 ₂ ...Second passage, 20...
...Multi-stage cylinder chamber, 21...Bypass passage, 22
... Threaded part, 23 ... Needle valve, 23a ... Valve shaft, 23b ... Flange part, 23c ... Circumferential groove, 2
3d...Handle part, 24, 27...Valve seat part, 2
5 ₁ ... first control section, 25 ₂ ... second control section,
26... cylindrical conical valve, 28... coil spring (elastic means), 29... engaging protrusion.

Claims (1)

[Claims] 1. A first passage and a second passage that communicate with each of the passages formed on the discharge side of two cylinders of the multiple reciprocating pump, and a multistage cylinder that communicates with these first and second passages. A regulating valve body having a chamber and a bypass passage communicating from the cylinder chamber to the suction side of the pump, a needle valve that protrudes from the outside of the valve body into the multi-stage cylinder chamber so as to be adjustable in forward and backward directions, and the needle It is composed of a cylindrical conical valve that is slidably fitted on a valve shaft connected to the valve, and is formed between the first passage and the bypass passage in the small diameter stepped portion of the needle valve and the multistage cylinder chamber. A first flow rate control section in which a valve seat section can be seated is formed, and a multi-stage cylindrical conical valve and a multi-stage valve are provided between the second passage and the bypass passage to appropriately apply the elastic force of the elastic means. A second flow rate control part is formed in which a valve seat part formed in a large diameter stepped part of the cylinder chamber can be seated, and at this time, the cylindrical conical valve which is always seated is controlled by the needle by the elastic means. A multiple reciprocating pump characterized in that the engaging protrusion protruding from the valve shaft of the valve is formed so as to be able to open the needle valve against the elastic means as the needle valve opens. Discharge flow rate adjustment valve.