JPS5828439B2 - Condensate recovery pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condensate recovery pump device that directly transports condensate generated in a steam system to a high-pressure location such as a boiler or to a condensate recovery pipe located at a high location.

Conventionally, a condensate recovery pump device includes a pump, a circulation passage connecting a discharge port and a suction port of the pump, a nozzle member that creates a jet flow in the circulation passage, and an opening in the jet flow portion of the circulation passage. A well-known and publicly used device is composed of a condensate suction passageway, and a condensate pressure-feeding passageway extending from the circulation passageway toward the normal feed side.

The condensate recovery pump device having the above structure circulates water in a circulation passage using a pump, injects the circulating water from a nozzle to create a jet stream, and sends condensate under pressure to a low ball area generated around the jet stream. The suction condensate is sucked in, the sucked condensate is pressurized in the circulation passage and the pump, and the sucked condensate is pumped through the condensate pressure-feeding passage, leaving a portion to become circulating water.

However, there are large fluctuations in the amount of condensate generated in the steam system, and the suction capacity of the condensate recovery pump device is constant, so the amount of condensate on the condensate suction passage side decreases and steam is sucked in. There are cases.

In the circulation passage, bubbles are generated due to the inhaled steam, and when the bubbles collapse, noise and vibration are generated.

Furthermore, bubbles collapsing within the pump cause erosion, especially of the vanes of the pump, shortening the life of the condensate recovery pump device.

In view of the above circumstances, it is an object of the present invention to provide a condensate recovery pump device that prevents the inhalation of steam and eliminates the problems of noise, vibration, and erosion caused by the inhalation of the steam.

The configuration of the condensate recovery pump device of the present invention is as follows.

The condensate generated in the steam-using equipment shade is guided to the pump device through the condensate suction passage, elevated by the pump device, and guided to the pumping light through the condensate pressure passage.

A bypass passage is provided to return a portion of the condensate pressurized by the pump device to the condensate suction passage, and a regulating valve means is disposed therein, and the condensate is passed through the bypass passage so as to maintain the water level in the condensate suction passage above a predetermined level. return.

The following pump devices can be used.

The pressurized water discharged from the discharge port of the pump is guided to the suction port through the circulation passage.

A nozzle member is arranged in the circulation passage to create a jet stream.

Condensate generated in steam-using equipment, etc. is guided to the jet stream section through the condensate suction passage and sucked into the jet stream.

Pressurized water is guided to the pumped light through a condensate pumping passage branched from the high pressure section of the circulation passage.

In this case, the pressurized water in the high moiety section of the circulation passage or the condensate supply passage is returned to the condensate suction passage through the bypass passage.

Of course, a control valve is placed in the bypass passage to control the flow therein as described above.

Generally, a turbo pump such as a centrifugal pump is used as the pump, but other reciprocating pumps or rotary pumps can also be used.

The above-mentioned valve means may be an electric one, which is a combination of a level switch that detects fluctuations in the condensate level or water head on the condensate suction passage side, and a solenoid valve or an electrically operated valve exclusively for electric valves, or an electric one on the condensate suction passage side. There is a mechanical valve means that adjusts the amount of water by using the rising and falling of a float.

The flow rate through the bypass passage is set to the minimum suction amount that prevents steam intake when there is no condensate on the condensate suction passage side.

The effects of the present invention are as follows.

Condensate generated in steam-using equipment, etc. is led to the suction port of the pump through the condensate suction passage, where it is pressurized, exits from the discharge port, and is led to the pumping light through the condensate pressure transmission passage.

During this period, when the introduction of condensate decreases or stops and the water level in the condensate suction passage drops to a predetermined water level, this is detected and the control valve opens, allowing some of the water pressurized by the pump to be sucked in through the bypass passage. Return to the passage and maintain the water level in the suction passage above the specified level.

Therefore, gas such as steam is not sucked into the pump device, thereby preventing noise, vibration, and corrosion of pump parts.

The present invention will be explained in detail based on an embodiment shown in FIG.

1 is a pump, generally a centrifugal pump is used.

2 is a motor that drives the pump 1 .

Reference numeral 3 denotes a circulation passage connecting the discharge port 4 and the suction port 5 of the pump 1, and is formed by pipe materials 3a to 3h.

The pipe material 3a is a straight pipe connected to the discharge port 4 of the pump 1.

The pipe material 3b is a branch pipe that forms the openings of a condensate feed passage 6 that opens into the circulation passage 3 and a bypass passage 7 described below.

Further, since the condensate pressure feeding passage 6 is connected to a high point such as a pipe or a condensate recovery pipe at a high place, a check valve for preventing backflow may be provided in some cases.

The tube material 30 is a bent tube.

The tube material 3d is a tube material to which the nozzle 8 is fixed.

The pipe material 3e is a pipe material that forms a suction chamber 9 around the nozzle 8, and also forms an opening of a condensate suction passage 10 that opens into the suction chamber 9 and a bypass passage 7 described below.

Further, a riser pipe 11 is connected to a portion forming the condensate suction passage 10.

12 is a level switch added to the riser pipe 11,
When the two electrode rods 12a are under the water surface, they are electrically connected and turned ON.
When it is above the water surface, it is insulated and turned off.

Further, the riser pipe 11 is connected to an outlet side piping (not shown) of the steam trap shade.

Reference numeral 7a denotes a pipe material connected between the pipe material 3b and the pipe +73e, which connects the bypass passage 7 toward the suction chamber 9 from the middle of the circulation passage 3.
form.

13 is an electrically operated valve that opens and closes the bypass passage 7;
A solenoid valve is used.

A is a connection connecting the electrically operated valve 13, the power supply 14, and the switch switch 12, so that when the level switch 12 is ON, the electrically operated valve 13 is closed, and when the level switch 12 is OFF, the electrically operated valve 13 is opened. is connected to.

Here, the amount of water flowing through the bypass passage 7 is set to be the minimum amount of water that prevents the intake of steam from the condensate suction passage 10.

The pipe material 3f forms a nod portion that mixes and rectifies the circulating water injected from the nozzle 8 and the condensate sucked in from the condensate suction passage 10.

The tube material 3g is a diffuser section that converts the moving box of water flowing out from the throat section into static pressure.

The pipe material 3h is a bent pipe connected to the suction port 5 of the pump 1.

The operation of the condensate recovery pump device having the above configuration will be explained.

Immediately before starting, the circulation passage 3 is primed with water.

When the pump 1 is started by the movement of the motor 2, the water in the circulation passage 3 circulates and is injected from the nozzle 8 to become a jet stream.

At this time, a low pressure region is generated around the jet flow, and the condensate introduced into the suction chamber 9 through the condensate suction passage 10 is sucked into the low pressure region, mixed with circulating water in the nozzle, and rectified. In the diffuser section, the dynamic pressure of the mixed water of the circulating water and condensate is converted into static pressure.

Then, the pressure on the suction port 5 side of the pump 1 increases, and the pump 1
The mixed water is pressurized and discharged from the discharge port 4 and into the circulation passage 3 without causing cavitation, and the majority of the mixed water is pumped from the condensate pressure feeding passage 6, leaving a part of the mixed water to become internal water. be done.

In this state, the level control switcher 12 on the condensate suction passage 10 side is submerged in water and is in the ON state, and the electrically operated valve 13
is closed, and the bypass passage 7 is blocked.

When the suction capacity of the condensate recovery pump device exceeds the flow rate of condensate on the condensate suction passage 10 side, the water level on the suction passage 10 side decreases, and the level switch 12 is set above the condensate level. When this happens, it becomes OFF, and electrically operated valve 1
When the valve 3 is opened, a portion of the circulating water is directly introduced into the suction chamber 9 through the bypass passage 7, and is sucked into the low pressure region generated on the injection side of the upper nozzle 8.

Therefore, even if the amount of condensate flowing down into the condensate suction passage 10 is slight or disappears, the circulating water sucked in from the bypass passage 7 prevents the intake of steam from the suction passage 10 side.

FIG. 2 shows a condensate recovery pump device according to another embodiment.

In this case, the bypass passage 22 is provided between the material 30' and the riser 11'.

21 is a float chamber formed on the condensate suction passage 10 side;
A bypass passage 22 is opened in the upper part of the float chamber 21 .

Reference numeral 23 denotes a float placed inside the float chamber 21, which floats up and down according to the water level on the condensate suction passage 10 side, and lands on the valve seat 25 formed at the open end of the float chamber 21 of the bypass passage 22, and the bypass The amount of water introduced from the passage 22 to the condensate suction passage 10 side is adjusted.

Reference numerals 24 and 26 denote through holes that communicate the float chamber and the condensate suction passage 10 side, and 36' denotes a pipe material.

However, parts common to the embodiment shown in FIG. 1 are given the same reference numerals.

The present case is characterized in that the bypass passage 22 is opened and closed mechanically using a float 23, unlike the embodiment shown in FIG. 1, which opens and closes the bypass passage 7 electrically.

Further, since it has the same effect as the embodiment shown in FIG. 1 above, detailed explanation will be omitted.

In this way, according to the present invention, even when the condensate level on the condensate suction passage side has disappeared, the suction of steam is prevented, and the problems of noise, vibration, and erosion caused by the suction of steam are eliminated. We can provide pump equipment.

In addition, the present invention returns part of the water pressurized by the pump to the suction passage, and maintains the water level in the suction passage above a predetermined level to prevent gases such as steam from being sucked into the pump device. There is no need to stop the pump device even if the inflow of water stops.

Therefore, the number of times the electric motor is started and stopped is greatly reduced, reducing operating costs.

Further, unlike in the past, there is no need to provide a tank upstream of the pump device to prevent inhalation of steam, so equipment costs can be reduced.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of a main part of a single-wound condensate recovery pump device of the present invention, and FIG. 2 shows a sectional view of a main part of a condensate recovery pump device of another embodiment. 1 is a pump, 2 is a motor, 3 is a condensate circulation passage, 4 is a discharge port, 5 is a suction port, 6 is a condensate pressure feeding passage, 7゜22 is a bypass passage, 8 is a nozzle, 9 is a suction chamber, 10 is a condensate A water intake passage, 12 a level switch, 13 an electrically operated valve, and 23 a float.

Claims (1)

[Claims] 1 Pressurized water discharged from the discharge port of the pump is guided to the suction port through the circulation passage, a nozzle member is arranged in the circulation passage to create a jet stream, and the condensate generated in steam-using equipment, etc. is condensed. The pressurized water is guided to the jet stream through the suction passage and sucked into the jet stream, and the pressurized water is guided to the pressurized light through the condensate forward passage branched from the high pressure part of the circulation passage, and the pressurized water in the high pressure part of the circulation passage or the condensate pressure passage is sucked into the jet stream. A bypass passage is provided for returning the water to the condensate suction passage, a regulating valve means is disposed therein, and the condensate is returned through the main passage so as to maintain the water level in the condensate suction passage above a predetermined level. Condensate recovery pump device. 2 A control valve means that electrically detects the water level in the condensate suction passage with a level switcher and operates an electrically operated valve according to the signal to maintain a predetermined water level in the condensate suction passage. The condensate recovery pump device according to claim 1, characterized in that it is disposed in the bypass passage. 3. Bypassing the control valve means mechanically operated by a float that ascends and descends according to the water level of the condensate suction passage. The condensate recovery pump device according to claim 1, wherein the condensate recovery pump device is arranged in a passage.