JP6076717B2 - Ejector type vacuum pump - Google Patents

Description

The present invention relates to an ejector type vacuum pump in which an ejector and pump means are combined. The ejector type vacuum pump generates a vacuum suction force in the ejector section by circulating a fluid in the ejector by a pump means, and has been conventionally used as a condensate suction recovery device from a low-pressure steam using device or the like. .

A conventional ejector-type vacuum pump includes a spiral pump, a circulation path connecting a discharge port and a suction port of the spiral pump, and an ejector and a tank disposed in the middle of the circulation path.

JP 7-253100 A

The conventional ejector type vacuum pump has a problem that a large amount of cooling water has to be replenished in order to maintain the suction force of the ejector at a predetermined value. Since the suction force that can be generated by the ejector is determined by the temperature of the liquid passing through the ejector, a large amount of cooling water must be replenished particularly when the liquid temperature is lowered.

The problem to be solved by the present invention is to obtain an ejector type vacuum pump that can reduce the amount of cooling fluid to be replenished by increasing the heat radiation of the circulating fluid.

In the present invention, a tank is connected to a tank by a circulation passage on the inlet side of an ejector via a liquid pumping pump means. The tank is shaped like a double cylinder, and the surface of the tank is placed at the center of the double cylinder tank. It forms an atmospheric contact space in contact with the atmosphere.

In the present invention, since the tank is formed in a double cylindrical shape and an air contact space is formed in the center of the double cylindrical tank so that the surface of the tank is in contact with the atmosphere, the surface area of the tank increases and the tank surface The amount of cooling fluid to be replenished can be reduced by increasing the amount of heat released from the atmosphere to the atmosphere.

It is a block diagram of the ejector type vacuum pump concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. In FIG. 1, the ejector 1, the circulation passages 2 and 5, the liquid pumping pump 3, and the tank 4 interposed in the circulation passages 2 and 5 constitute an ejector vacuum pump.

  The tank 4 is formed in a double cylindrical shape, and an air contact space 10 is formed at the center. The atmospheric contact space 10 is a cylindrical space penetrating between the upper and lower sides of the tank 4, and the cooling water 11 in the tank 4 is cooled by taking the heat of the surface of the tank 4 by cooling the space by raising the atmosphere. Is something that can be done.

In order to further promote the heat radiation from the surface of the tank 4, although not shown, a plurality of heat radiation plates connected to the surface of the tank 4 can be attached between both ends of the atmospheric contact space 10.

A cooling water supply pipe 6 for supplying cooling water is connected to the upper part of the tank 4, and an atmosphere communication pipe 7 that communicates the inside of the tank 4 with the atmosphere is connected. On the other hand, a surplus water discharge pipe 8 for discharging surplus water in the tank 4 to the outside is connected to the lower portion of the tank 4. A suction passage 9 is connected to the suction chamber 12 of the ejector 1.

The circulation path 2 on the outlet side of the ejector 1 is connected to the upper left side of the tank 4 and is connected to the lower right side of the circulation path 5 tank 4 communicating between the tank 4 and the liquid pump 3. In this way, the upper side of the left side and the lower side of the right side of the tank 4 are connected to the outlet side of the ejector 1 and the suction port side of the liquid pumping pump 3, respectively, so that the suction side of the ejector 1 and the liquid pumping pump 3 are sucked. The mouth side becomes a diagonal position of the tank 4, and the air in the tank 4 is prevented from being sucked into the suction port of the liquid pump 3 by the cooling water supplied from the outlet side of the ejector 1 into the tank 4. can do.

The liquid in the tank 4 is discharged from the discharge port of the liquid pump 3 to the ejector 1 to generate a suction force in the ejector 1, and a predetermined fluid, for example, condensate condensed with steam, is sucked from the suction passage 9.

The shape of the tank 4 is a double cylindrical shape, and the atmosphere contact space 10 where the surface of the tank 4 is in contact with the atmosphere is formed in the center, thereby increasing the surface area of the tank 4 and releasing it from the surface of the tank 4 to the atmosphere. By increasing the amount of heat, the amount of cooling fluid to be supplied to the tank 4 can be reduced.

INDUSTRIAL APPLICABILITY The present invention can be used as an ejector type vacuum pump that sucks and recovers condensate from a low-pressure steam using device or the like.

1 Ejector 2 Circulation Passage 3 Liquid Pressure Pump 4 Tank 5 Circulation Passage 9 Suction Passage 10 Air Contact Space 11 Cooling Water 12 Suction Chamber

Claims (1)

An ejector,
Liquid pumping pump means arranged on the inlet side of the ejector;
An ejector type vacuum pump comprising a tank disposed on the outlet side of the ejector,
The tank has a double cylindrical shape in which a surface of the tank is in contact with the atmosphere at the center, and has a heat sink connected to the surface of the tank in the atmosphere contact space. Ejector type vacuum pump.

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