JP2021152361A - Aspirator - Google Patents

Abstract

To provide an aspirator capable of saving water without any loss in intake flow rate.SOLUTION: A flow passage 41 has its flow passage area made constant from an upstream end 42 to a downstream end 43 to impart resistance to a swirl water current flowing in the flow passage 41, so even when water fed to a nozzle 11 is reduced in amount, a decrease in pressure of the swirl water current flowing in the flow passage 41 can be suppressed. This may suppress the formation of a succession of air bubbles. Consequently, linkage between outside air and a pressure reduction chamber 33 through the succession of air bubbles formed in the swirl water current flowing in the flow passage 41 is blocked. As a result, the outside air is deterred from being introduced into the pressure reduction chamber 33 from the flow passage 41, and the intake air flow of an aspirator 1 can be increased, so that the aspirator 1 can save water without any loss in intake air flow.SELECTED DRAWING: Figure 1

Description

The present invention relates to an ejector that injects a rotating water flow generated in a nozzle at a high speed to generate a vacuum.

An ejector is a physics and chemistry device that injects a rotating water flow generated in a nozzle from an injection port at a high speed to generate a vacuum in the jet. For example, in the aspirator described in Patent Document 1, water to which a rotational force is applied by blades travels while swirling in a nozzle and is ejected from an injection port at high speed.

Jitsuzensho 59-005800

In general, an ejector can save water by correlating the hole diameter (flow path area) of the nozzle injection port and the amount of water used (water supply amount), and reducing the diameter of the nozzle injection port to reduce the amount of water used. .. However, if the diameter of the injection port of the nozzle is simply reduced, the capacity of the aspirator will decrease due to the decrease in suction flow rate (exhaust flow rate).

An object of the present invention is to provide an ejector capable of saving water without losing the suction flow rate.

The aspirator of the present invention includes a nozzle supplied from water, a water discharge pipe provided on the downstream side of the nozzle, and a vacuum chamber provided on the outer periphery of the downstream end of the nozzle, and is generated in the nozzle. An aspirator that injects the swirled water flow from the injection port at the downstream end of the nozzle at high speed to generate a vacuum. The water discharge pipe has an upstream end that opens into the decompression chamber and a downstream end that is external. The flow path is provided, and the flow path area is constant from the upstream end to the downstream end.

According to the present invention, the aspirator can be water-saving without losing the suction flow rate.

It is sectional drawing of the aspirator which concerns on this embodiment.

This will be described with reference to the figure to which one embodiment of the present invention is attached.
FIG. 1 shows a cross-sectional view of the ejector 1 according to the present embodiment. The aspirator 1 has a nozzle 11 to which water is supplied from a water pipe (not shown), and a water discharge pipe 31 provided on the downstream side of the nozzle 11. The nozzle 11 is provided with a tapered flow path 3 in which the flow path area gradually decreases toward the downstream injection port 13. A connecting portion 15 to which a hose (not shown) is connected is provided on the outer periphery of the upstream end portion of the nozzle 11. The connecting portion 15 is provided with a tapered portion 16 that facilitates insertion into the hose. The outer diameter of the tapered portion 16 is reduced toward the water supply port 12 at the upstream end. Further, the connecting portion 15 is provided with a bamboo shoot portion 17 for preventing the hose from coming off.

A rotating blade 5 is provided at the water supply port 12 of the nozzle 11. The rotating blade 5 has a plurality of blades 6 (only "2 blades" are shown in FIG. 1) provided around the shaft. The rotating blade 5 is mounted on the nozzle 11 by press-fitting the outer periphery of the blade 6 into the water supply port 12. The blades 6 are arranged at regular intervals in the circumferential direction. The facing surfaces between the adjacent blades 6 are inclined at a constant inclination angle with respect to the axial plane of the rotating blade 5. Between the adjacent blades 6 and 6, a plurality of rotating flow paths 7 (only "1" is shown in FIG. 1) for applying a rotating force to the passing water are provided.

A connecting portion 32 for connecting the nozzle 11 and the intake pipe 21 is provided at the upstream end of the water discharge pipe 31. The connecting portion 32 is formed in a bottomed cylindrical shape with an opening at the upstream end. A pressure reducing chamber 33 is provided inside the connecting portion 32. The decompression chamber 33 is formed on the outer periphery of the downstream end portion 19 (injection port 13) of the nozzle 11. A certain gap is provided between the downstream end surface 20 of the nozzle 11 and the bottom surface 34 of the connecting portion 32 (decompression chamber 33) of the water discharge pipe 31. A connecting port 36 that communicates with the decompression chamber 33 via a communication passage 35 is provided on the cylindrical side wall of the connecting portion 32 of the water discharge pipe 31. One end side (left side in FIG. 1) of the intake pipe 21 is connected (press-fitted) to the connection port 36. The flow path 22 of the intake pipe 21 is provided with a check valve 23 that blocks the flow of fluid from one end side (pressure reducing chamber 33 side) to the other end side (outside).

The water discharge pipe 31 has a water discharge portion 37 extending from the downstream end of the connection portion 32 in the axial direction of the ejector 1 (“downward” in FIG. 1). The water discharge portion 37 is provided with a flow path 41 coaxial with the axis of the aspirator 1. In the flow path 41, the upstream end 42 opens to the decompression chamber 33 and the downstream end 43 (water discharge port) opens to the outside. The flow path 41 has a circular cross section, and the flow path area is constant from the upstream end 42 to the downstream end 43. In the present embodiment, the diameter of the flow path 41 (flow path diameter) is set large in the range of 0.2 to 0.4 mm with respect to the diameter of the injection port 13 of the nozzle 11.

Next, the operation of the aspirator 1 will be described.
Water supplied from a water distribution facility such as a water supply via a hose (not shown) passes through a rotating blade 5 to apply a rotating force to become a rotating water flow and flows down the flow path 3. The rotating water flow is accelerated by flowing down the flow path 3 whose channel area gradually decreases, so that it becomes a high-speed rotating water flow and is injected from the injection port 13. At this time, a vacuum (negative pressure) is generated inside the jet, that is, the water jetted from the injection port 13, and the vacuum chamber 33 is depressurized by the vacuum generated in the jet. As a result, a differential pressure is generated between the pressure reducing chamber 33 and the flow path 22 in the intake pipe 21, the check valve 23 is opened, and the outside air is drawn into the pressure reducing chamber 33 via the flow path 22.

Here, in the conventional aspirator (see Patent Document 1), in order to increase the flow velocity of the rotating water flow by causing the rotating water flow flowing through the flow path 41 to flow down with a smaller water channel resistance, the flow path area is set on the upstream side of the flow path 41. An enlarged diameter portion that was gradually increased was provided. As a result, in the conventional aspirator, the rotating water flow injected from the nozzle 11 flows down while rotating so as to expand the flow path in the radial direction due to the centrifugal force due to the rotation. The pressure of the rotating water flow flowing through the central portion) becomes lower than the pressure of the rotating water flow flowing outside the flow path 41. As a result, the bubbles contained in the rotating water flow (aerated water flow) flowing inside the flow path 41 expand, and a series of bubbles is formed in the vicinity of the axis of the flow path 41.

As described above, in the conventional vacuum ejector, a series of bubbles formed in the rotating water flow flowing inside the flow path 41 causes the downstream end 43 (water discharge port) of the flow path 41 and the decompression chamber 33 to communicate with each other. The outside air was introduced into the decompression chamber 33 through a series of bubbles to reduce the suction flow rate (exhaust flow rate) of the ejector.

Therefore, in the present embodiment, the flow path area of the water discharge portion 37 is made constant from the upstream end 42 to the downstream end 43 to impart resistance to the rotating water flow flowing through the flow path 41. According to this embodiment, the pressure of the rotating water flow flowing through the flow path 41 is increased, and a chain of bubbles is formed in the rotating water flow flowing inside (central part) of the flow path 41, which has been a problem with conventional vacuum ejectors. It is possible to prevent the bubbles from flowing, and it is possible to block the communication between the outside air and the decompression chamber 33 through the chain of bubbles. As a result, the introduction of outside air from the flow path 41 into the decompression chamber 33 is suppressed, so that the suction flow rate of the aspirator 1 is increased, and the aspirator 1 is saved without losing the suction flow rate. be able to.

According to the experiment conducted by the applicant, the suction flow rate of the ejector 1 having a hole diameter of the injection port 13 of the nozzle 11 of 2.6 mm could be increased by 60% as compared with the conventional ejector.
Further, in the present embodiment, the flow path of the flow path 41 can be prevented from forming a series of bubbles in the rotating water flow flowing through the flow path 41 due to the pressure drop of the rotating water flow flowing through the flow path 41. It can be carried out by appropriately setting the area and the total length.

1 Aspirator, 11 nozzles, 13 injection port, 31 water discharge pipe, 41 flow path, 42 upstream end, 43 downstream end

Claims (1)

The nozzle provided with water supplied from the tap, a water discharge pipe provided on the downstream side of the nozzle, and a decompression chamber provided on the outer periphery of the downstream end of the nozzle, and the rotating water flow generated in the nozzle is described. It is an ejector that injects at high speed from the injection port at the downstream end of the nozzle to generate a vacuum.
The water discharge pipe is provided with a flow path in which the upstream end opens into the decompression chamber and the downstream end opens to the outside.
The flow path is an aspirator characterized in that the flow path area is constant from the upstream end to the downstream end.

Images