JPS6025637B2 - condensate recovery pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condensate recovery pump that pumps high-temperature condensate generated in steam-using equipment or the like to a boiler or the like.

As a pump of this kind, an ejector is arranged in the circulation passage connecting the discharge port and suction port of a centrifugal pump operated by an electric motor, and a condensate introduction passage is closed at the jet part of the ejector member, A condensate discharge passage is branched from the circulation passage (discharge port-ejector member), and a primary pressure regulating valve is disposed in the condensate discharge passage. The primary pressure regulating valve maintains the pressure within the circulation passage connecting the discharge port of the pump and the ejector member at a predetermined value, and allows condensate to pass through the discharge passage when the pressure exceeds the predetermined value.

The conventional pump described above is effective when the jet flow at the ejector member is kept constant and the pressure in the condensate introduction passage is constant.

However, depending on the steam-using equipment, the pressure in the condensate introduction passage may fluctuate, and in this case, conventional pumps are inefficient in terms of both the tin level and the amount of water pumped. The present invention improves the efficiency of the pump by controlling the pressure within the circulation passage according to the pressure within the condensate inflow passage. A detailed explanation will be given below based on the illustrated embodiment.

1 is a well-known centrifugal pump driven by an electric motor (not shown).

Reference numeral 1 designates a circulation passage connecting the discharge port 2 of the pump 1 and the nozzle 4 of the ejector member 3, and a circulation passage connecting the diffuser 5 of the river ejector section 4 and the suction port 6 of the pump 1.

A condensate introduction passage 8 is opened in the jet section 7 of the ejector section 3 and is connected to steam-using equipment (not shown).

The condensate in the passage 8 is attracted by the jet from the nozzle 4 and flows into the diffuser 5 together. A condensate discharge passage 9 branching from the circulation passage 1 to a boiler (not shown) or the like is provided, and a pressure regulating valve 10 is provided.

Reference numeral 11 denotes a passage that leads the pressure inside the condensate introduction passage 8 to one regulating valve.

An example of a pressure regulating valve is shown in FIG.

12 indicates the calyx body.

A valve port 15 between the inlet 13 and the outlet 14 is opened and closed by a valve body 16. The valve body 16 has a piston 18 that slides in a cylinder portion 17 in an airtight manner. 19 is a circle.

The lower surface of the piston 18 is fitted into the inlet 13 through the through hole 23. A compressed spring 22 is in contact with the upper surface of the piston 18 via an adjustment shaft 20 via a spring receiving plate 21 .
Further, the pressure of the condensate introduction passage 8 acts on the upper surface of the piston 18 through the passage 11. Thus, the pressure regulating valve 1 opens when the differential pressure between the internal pressure of the circulation passage 1 and the internal pressure of the condensate introduction passage 8 becomes greater than the value set by the spring 22.

Therefore, as the pressure inside the condensate introduction passage 8 increases or decreases, the pressure inside the circulation passage 1 increases or decreases, and the jet flow from the nozzle 4 also changes in strength.

In this way, the condensate recovery pump according to the present invention performs an efficient pumping action according to the pressure inside the condensate introduction passage.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a condensate recovery pump according to the present invention, and FIG. 2 is a sectional view of an example of a pressure regulating valve. 1 is a centrifugal pump, 2 is a discharge port, 3 is an ejector, 4 is a nozzle, 5 is a diffuser, 6 is a suction port, 8 is a condensate introduction passage, 9 is a condensate discharge passage, and 10 is a pressure regulating valve. . Figure 2

Claims (1)

[Claims] 1. Circulation passages I and II connecting the discharge port and suction port of a centrifugal pump operated by an electric motor are provided, an ejector member is disposed in the circulation passage, a condensate introduction passage is opened in the jet part of the ejector member, and the A condensate discharge passage is provided branching off from the circulation passage I that connects the discharge port of the pump and the nozzle of the ejector member, and when the pressure inside the circulation passage I becomes greater than the pressure inside the condensate introduction passage by a predetermined value or more. A condensate recovery pump comprising a pressure regulating valve disposed in the condensate discharge passage that opens to allow condensate in the circulation passage I to pass to the condensate discharge passage.