JPS60142094A - Centrifugal pump - Google Patents

Abstract

PURPOSE:To make it possible to feed out two kinds of fluids with the use of a set of a rotary shaft and a blade wheel without the both fluids being mixed together, by providing such an arrangement that the intermediate sections of an impeller are coupled together with the use of a special partition plate, inner and outer communication passages are formed in the blade wheel, independently from each other, and the outlet sections of the impeller are arranged at one and the same level. CONSTITUTION:An inner communication passage 7 through which one of two kinds of fluids flows is formed between the outer surface 4a of a boss 4 of a blade wheel 2 and a partition plate 6 which couples between the intermediate sections of an impeller 1 and which is spaced from the outer surface 4a of the boss 4 and the inner surface of a pump casing 6, and an outer communication passage 8 through which the other kind of fluid flows is formed between the partition plate 6 and the pump casing 5 with these communication passages 7, 8 being communicated with independent communication passages 9, 10, respectively. Further, the outlet sections of the impeller 1 are arranged at one and the same level. With this arrangement two kinds of fluids may be fed out with the use of only one set of a rotary shaft 3 and a blade wheel 2 without being mixed together. Accordingly, when the centrifugal pump of this arrangement is applied to a system which requires two pumps, it is possible to reduce the number of attaching fixtures and as well to simplify the drive transmission mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a centrifugal pump, and more particularly, to a centrifugal pump capable of independently pumping fluids flowing through different distribution systems by one pump. . This is used, for example, in the field of circulating cooling water in an engine housing cooling system and an intake air cooling system in an automobile.

[Prior art]

In one type of cooling system, a system for circulating cold water for cooling the engine housing and a system for circulating cooling water for pre-cooling the intake air are installed independently. Publication No. 50-7'8810 (There is something described in the condolence.In this case, the heat of the engine cooling water is radiated by the main radiator, and the heat of the intake air cooling water is radiated by the re-radiator, depending on the cooling purpose. Cooling water with different degrees of heat dissipation is sent to 11 independent cold J systems to achieve the specified cooling.By the way, the cooling water used for cooling the engine and cooling the intake air is Since the temperature of the cooling water is different as described above, a water pump is required for each system to circulate each system even if the cooling water source 1 is the same. However, providing pumps that are driven independently by the engine in each system is difficult for vehicles that are equipped with various devices and have little space to install them. There is a problem that the connection piping to the system becomes complicated and installation is not easy.

[Purpose of the invention]

The present invention was made in view of the above-mentioned problems, and its purpose is to provide a centrifugal pump that can simultaneously and independently send fluids with different conditions such as different temperatures to each distribution system using a single pump. It's something to do.

[Structure of the invention]

The features of the present invention are as follows. A centrifugal pump in which an impeller having a plurality of impellers is mounted on a pump rotation shaft, and the middle part of each impeller is connected by a partition plate that is separated from the outer surface of the boss of the impeller and the inner surface of the pump case. A flow path communicating with the inner flow path formed between the partition plate and the outer surface of the boss and the outer flow path formed between the partition plate and the pump case is provided independently, and each impeller outlet portion This is a centrifugal pump in which both are placed in the same location.

〔Example〕

Embodiments will be described below with reference to drawings.

FIG. 1 is a sectional view of a centrifugal pump according to the present invention, in which an impeller 2 having a plurality of impellers 1 is mounted on a pump rotating shaft 3. The intermediate portion of each impeller (2) is connected by a partition plate 6 that is spaced one distance from the outer surface 4a of the hub 4 of the impeller 2 and the inner surface of the pump case 5. In the case of this figure, the partition plate 6 has a trumpet shape that opens downward, and an inner flow path 7 through which one fluid flows is formed between the partition plate 6 and the outer surface 4a of the boss. An outer flow path 8 is formed between the pump case 6 and the pump case 5, through which the other fluid flows. These flow passages 7 and 8 communicate with flow passages 9 and 10 that are provided independently. The distribution path 9 consists of an inflow side path 9a and an outflow side path 9b with the inner flow path 7 in between, and the distribution path 10 consists of an inflow side path 10a and an outflow side path 10b with the outer flow path 8 in between, Each impeller outlet i'fli9n,
Ions are placed at the same location. That is, as shown in FIGS. 2(a) and 2(b), fluid flows into the inflow side path 9a and ]Oa from opposite directions, but each fluid flows into the impeller 2. The inflow point is the impeller inlet 9m formed concentrically with the pump rotation shaft 3.
, '10rn, and since each fluid flowing into this artificial part is not pressurized, there is almost no pressure difference flowing into this part. Further, the locations where the fluid flows out from the impeller 2 are in the same circumferential direction of the impeller 2. therefore,
As can be seen from both figures, the inner flow passage 7 and the outer flow passage 8 overlap in the vertical direction after the entrance, and the pressure gradients of the fluid flowing through each of them by the impeller 1 are very similar. There is no significant difference in the pressure between the fluids in both passages. Note that II is a pulley fixed to the tip of the pump rotating shaft 3 and transmits driving force, and 12 is a belt stretched around the pulley.

When the centrifugal pump 15 having such a configuration is interposed in the cooling system 21, 22 shown in FIG. 3, it can be operated as follows. Cooling water that has been heated by passing through the housing of the engine 16 and cooling it is circulated to the main pump 17 via the centrifugal pump 15.

At the same time, the cooling water, which has been heated by cooling the intake air in the ink cooler 19 interposed in the intake passage 18, is circulated to the Zaburajuta 20 via the centrifugal pump I5.

While such cooling water is circulating through the cooling system 21, 22, in the centrifugal pump 15, the inflow side path 9a of FIG.
The cooling water that has passed through the housing of the engine 16 and the cooling system 21 flows into the inflow path 1 in FIG. 2(b).
Cooling water that has passed through the ink cooler 19 and the cooling system 22 flows from 0a. And each person 1 part 9
m and 10m toward the impeller 2, and while flowing through the inner flow passage 7 and the outer flow passage 8, both cooling water flows into the impeller 1.
Pressure is applied by the rotation of Each cooling water has an outlet part 9n,
It is led out from lOn to the outlet channels 9b, 10b and further sent to the respective radiators 17.20 via the cooling system 21.22. At this time, b cooling waters having different temperatures will flow through the centrifugal pump 15, but since the respective flows are separated by the partition plate 6, they will not mix. In addition, impeller inlet parts 9m, 10m and outlet parts 9n, 1
0n, for some time 11' to allow the rotation of impeller 2 φπ! ; Since i exists, two types of cooling water are mixed at that location. However, as mentioned above, since the respective outlets are arranged at the same location, both flow directions are the same and the pressurization gradient of the cooling water by the impeller 1 is also almost the same, so the flow of both There is no noticeable difference between the two cooling waters, and there is only slight mixing between the two cooling waters, and the two cooling waters are sent out independently by one impeller 2. The cooling water simultaneously sent out in this way is heat radiated by each radiator and becomes cooling water at a predetermined temperature. In addition, ink cooler 1
The intake air that has passed through the
Fuel is mixed in from the fuel mixture and supplied as an air-fuel mixture to the combustion chamber 24 during the intake stroke of the engine. Note that 25 is a supercharger.

In this way, the present centrifugal pump can be applied not only to the above-mentioned example of the cold 141 system, but also to cases where fluids flowing through different systems are sent out independently with one pump, so the number of pumps can be reduced. This makes it easier to install in automobiles where there is little room for installation, such as by simplifying the pump drive mechanism powered by the engine and by simplifying the piping of the vibrator through which fluid flows.

〔Effect of the invention〕

The present invention connects the intermediate portion of the impeller with a partition plate separated from the outer surface of the boss of the impeller and the inner surface of the pump case, independently provides an inner flow passage and an outer flow iin RR in the impeller, and separates the outlet portion of each impeller. Since the centrifugal pumps are arranged at the same location, one impeller rotating on one rotating shaft can independently deliver the two fluids without mixing them. Therefore, when applied to a device that requires two pumps, it is possible to reduce the number of attached devices and to simplify the drive transmission mechanism.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a centrifugal pump that is an embodiment of the present invention, and FIG.
Figure (b) is a view taken along the line III-Ill in Figure 1, and Figure 3 is a view of the cooling air in an engine to which a centrifugal pump is applied.
It is an overall layout diagram of the system. 1 impeller, 2-impeller, 3 pump rotating shaft, 4-boss, 4a-outer surface, 5-pump case, 6-partition plate, 7
Inner flow path, 8-Outer flow path, 9.10-Flow path, 9
m, 10m-population section, 9n, 10n--exit section, 15-
Centrifugal pump patent applicant Toyo Kogyo Co., Ltd.

Claims (1)

[Claims] (1) In a centrifugal pump in which an impeller having a plurality of impellers is attached to a pump rotation shaft, the intermediate portion of each impeller is connected by a partition plate separated from the outer surface of the boss of the impeller and the inner surface of the pump case. Flow paths communicating with the inner flow path formed between the partition plate and the outer surface of the housing and the outer flow path formed between the partition plate and the pump case are provided independently, and each 1. Make sure that the impeller outlet is located at the same location.
Centrifugal pump with jj characteristics.