JP6825829B2 - A priming faucet, and a pump with a priming faucet - Google Patents

Description

The present invention relates to a priming faucet and a pump including a priming faucet.

For example, in a land pump in which the position of the impeller is higher than the liquid level of the suction source, it is necessary to fill the inside of the pump casing with priming water at the start of operation. In that case, a priming water inlet is provided in the pump casing, and priming water is injected from there at the start of operation. Since it is necessary to seal the pump casing after the start of operation, a priming faucet is attached to the priming inlet. For example, as shown in Patent Document 1, the priming faucet is screwed into the priming inlet. In this case, a protrusion is provided on the head of the priming faucet to facilitate the rotation of the priming faucet during attachment and detachment to and from the priming inlet.

Conventionally, this protrusion has a substantially rectangular shape in the cross section, for example, like a pair of protrusions 94 provided on the head 91 in the conventional faucet 90 shown in FIG. As shown in the drawing, the protrusion 94 is used to insert a tool 21 between the protrusions 94 to rotate the priming faucet 90, and also has a handle for rotating the priming faucet 90 by hand. Also used as.

Jikkai Sho 63-141891

However, the conventional priming faucet 90 having the protrusion 94 as shown in FIG. 6 is not always easy to rotate when it is rotated by the tool 21 or by hand. More specifically, for example, when the sealing member is fixed between the priming inlet of the pump casing and the priming faucet 90 due to aged deterioration, or when rust is generated on the threaded portion, the priming faucet 90 is rotated. A large torque is required to make the tool 21, and in that case, a considerably large force F must be applied to the tool 21.

The present invention has been made in view of the above points. One object of the present invention is to provide a new and improved priming faucet capable of easily rotating the priming faucet with a smaller force, and a pump equipped with such a priming faucet. is there.

According to one aspect of the present invention, a priming faucet including a head and a threaded portion, the threaded portion being screwed into a priming faucet provided in a pump casing, a pair of priming faucets provided on the head. A pair of outer peripheral convex portions near the outer periphery of the head, and each outer peripheral convex portion extends toward the central axis side in a cross section having protrusions and the shape of each protrusion is normal to the central axis of the priming faucet. Provided is a faucet including a pair of side portions that do not intersect the straight line connecting each outer peripheral side convex portion and the central axis, and a central side convex portion formed at a position where the pair of side portions intersect with each other. ..

In the above configuration, for example, when a tool is passed between a pair of protrusions, a point of action of the force is formed at a position away from the central axis by the outer peripheral convex portion, so that the force applied to the tool A relatively large torque can be generated in the priming faucet.

In the priming faucet described above, at least one of the pair of sides may have an ergonomically designed shape. The ergonomically designed shape may be, for example, a shape curved in the direction opposite to the straight line.

In the above configuration, since the curved surface formed by the curved side portion becomes the pressing surface, it becomes easy to push the pressing surface by hand to rotate the priming faucet.

In the above priming faucet, the threaded portion is a male screw and may be screwed with a female screw provided at the priming water inlet.

In the above configuration, it is not necessary to rotate the pump casing for threading, so that highly accurate threading is possible even when the priming water injection port is formed at a position deviated from the central axis of the pump casing, for example. In addition, the outer diameter of the priming faucet can be made smaller.

According to another aspect of the present invention, there is provided a pump with a priming faucet as described above.

It is a schematic diagram which shows the pump provided with the priming faucet which concerns on one Embodiment of this invention. It is a schematic perspective view which shows the priming faucet which concerns on one Embodiment of this invention. It is sectional drawing of the protrusion part of the priming faucet which concerns on one Embodiment of this invention. It is a vertical sectional view of the priming faucet which concerns on one Embodiment of this invention. FIG. 3 is a cross-sectional view of the priming faucet shown in FIG. 3 in a state in which a tool for rotating the priming faucet is inserted. It is a figure which shows the same cross section as FIG. 5 about the conventional priming faucet.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a pump including a priming faucet according to an embodiment of the present invention. Referring to FIG. 1, the pump 1 includes a pump casing 2, a suction port 3, a discharge port 4, a motor 5, and a priming water injection port 6. A priming faucet 10 is screwed into the priming water inlet 6. The pump 1 is a centrifugal pump in which a motor 5 rotates and drives an impeller (not shown) arranged in a pump casing 2 to discharge a fluid sucked from a suction port 3 to a discharge port 4.

Here, the pump 1 in the illustrated example is a land pump, and the position of the impeller is higher than the liquid level of the suction source, so that priming is required. Therefore, when the operation of the pump 1 is started, the priming faucet 10 is removed to open the priming water injection port 6, and the priming water is injected into the pump casing 2 from there. After the start of operation, the priming faucet 10 is attached to the priming water inlet 6 to seal the pump casing 2. Therefore, in the pump 1, the priming faucet 10 is attached and detached every time the operation is started. However, as described above, the conventional priming faucet is not always easy to rotate, and it is not easy to rotate the priming faucet in which the seal member is deteriorated over time and rust is generated.

Therefore, the present inventors have devised a priming faucet 10 that can be easily rotated with a smaller force, and decided to attach it to the pump 1. As a result, the burden on the user in attaching / detaching the priming faucet 10 every time the operation is started is reduced, and the pump 1 can be used more comfortably. The structure of such a priming faucet 10 will be further described below with reference to FIGS. 2 to 6.

Note that FIG. 1 illustrates a configuration in which the pump 1, which is a centrifugal pump, includes a pump casing 2, a suction port 3, a discharge port 4, and a motor 5, but the pump according to the embodiment of the present invention has this configuration. It is not limited to such an example. The pump provided with the priming faucet according to the embodiment of the present invention is not limited to the centrifugal pump as long as it requires priming, and may be various centrifugal pumps, mixed flow pumps, or axial flow pumps. .. Further, the configuration or arrangement of the pump casing, the suction port, the discharge port, the motor, and the like is not limited to the above example, and can be freely designed.

FIG. 2 is a schematic perspective view showing a priming faucet according to an embodiment of the present invention. Referring to FIG. 2, the priming faucet 10 includes a head 11 and a threaded portion 13. The threaded portion 13 is screwed into a priming water inlet 6 provided in the pump casing 2 of the pump 1 described with reference to FIG. In FIG. 2, the thread groove on the surface of the threaded portion 13 is not shown.

The priming faucet 10 further includes a pair of protrusions 14 provided on the upper surface 12 of the head 11. The shape of each protrusion 14 includes a pair of outer peripheral side convex portions 15, a pair of pressing surfaces 16, a central side convex portion 17, and an outer peripheral portion 18. As will be described later, the outer peripheral side convex portion 15 is a portion that comes into contact with the tool to form a point of action of force when the priming faucet 10 is rotated by using the tool. The pressing surface 16 is a surface on which the user's finger is pressed when the user manually rotates the priming faucet 10. For this function, the pressing surface 16 may have an ergonomically designed shape. More specifically, the pressing surface 16 may be a concave surface as shown. The pressing surface 16 does not necessarily have to be a concave surface, and may have another shape designed so that the user can easily press the finger.

In the priming faucet 10 according to the present embodiment, the outer peripheral side convex portion 15, the central side convex portion 17, and the corner portion between the upper surface and the side surface of the protrusion 14 are chamfered. Alternatively, it is molded into a rounded shape. This is to prevent, for example, damage when a tool described later comes into contact with the tool, and / or discomfort or injury when the user manually pushes the pressing surface 16 of the protrusion 14 to rotate the priming faucet 10. .. Lines other than the outer shape of the priming faucet 10 shown in FIG. 2 are shown for convenience in order to express the chamfered or rounded shape of the priming faucet 10. Therefore, for example, not all of the lines shown in FIG. 2 are observed on the surface of the actually molded priming faucet 10.

FIG. 3 is a cross-sectional view of a protruding portion of the priming faucet according to the embodiment of the present invention. In the present specification, the cross section means a cross section having the central axis CA of the priming faucet 10 as a normal. The cross-sectional view of FIG. 3 corresponds to the sectional view taken along line III-III in FIG. Referring to FIG. 3, for each protrusion 14, the outer peripheral side convex portion 15 is located near the outer circumference of the head 11. This means that the outer peripheral side convex portion 15 is located closer to the outer circumference of the head 11 in comparison with the central axis CA of the priming faucet 10 and the outer circumference of the head 11. The position of the outer peripheral side convex portion 15 does not necessarily have to coincide with the outer circumference of the head 11.

On the other hand, in the cross-sectional view shown in FIG. 3, the pressing surface 16 is represented as a pair of side portions extending from each outer peripheral side convex portion 15 toward the central axis CA side, more specifically, a pair of curved side portions. .. This curved side portion does not intersect the straight line connecting each outer peripheral side convex portion 15 and the central axis CA, that is, the common tangents LN1 and LN2 of the two outer peripheral side convex portions 15 passing through the central axis CA in the illustrated example. As described above, when the shape of the pressing surface 16 is ergonomically designed, the curved side portion corresponding to the pressing surface 16 also has an ergonomically designed shape. For example, when the pressing surface 16 is a concave surface, the corresponding curved side portion has a shape curved to the side opposite to the nearest straight line LN1 and LN2.

The central convex portion 17 of the protrusion 14 is formed at a position where a pair of curved side portions corresponding to the pair of pressing surfaces 16 intersect with each other. As described above, since the curved side portion does not intersect with the straight lines LN1 and LN2 passing through the central axis CA, the position of the central convex portion 17 is offset with respect to the central axis CA. That is, the central convex portions 17 of the two protrusions 14 are separated from each other with the central axis CA in between. As will be described later, when the priming faucet 10 is rotated by using a tool, the tool is inserted between these central convex portions 17.

In the illustrated example, the outer peripheral portion 18 of the protrusion 14 has a cross-sectional shape that substantially matches the outer circumference of the head 11 of the priming faucet 10, but the embodiment of the present invention is not limited to such an example. .. For example, by denting, shaving, or notching the outer peripheral portion 18 toward the central axis CA within a range in which the required strength of the protrusion 14 is secured, the weight of the priming faucet 10 can be reduced, and / or the material can be reduced. You may try to save money.

FIG. 4 is a vertical sectional view of a priming faucet according to an embodiment of the present invention. In the present specification, the vertical cross section means a cross section including the central axis CA of the priming faucet. The vertical sectional view of FIG. 4 corresponds to the sectional view taken along line IV-IV in FIG. FIG. 4 shows that the priming faucet 10 includes a head 11 and a threaded portion 13, and the threaded portion 13 constitutes a male screw. In the present embodiment, the threaded portion 13 of the priming faucet 10 is a male thread and is screwed with a female thread provided at the priming water injection port 6 of the pump 1. In another embodiment of the present invention, the threaded portion of the priming faucet does not necessarily have to be a male thread, but may be a female thread. In that case, a male screw is provided at the priming inlet of the pump.

However, for example, as in the pump 1 of the example shown in FIG. 1, the priming water injection port 6 is located at a position deviated from the central axis of the pump casing 2 (corresponding to the central axis of the suction port 3 or the discharge port 4). When it is formed, it is advantageous that the threaded portion 13 of the priming faucet 10 is a male thread and the priming water inlet 6 is provided with a female thread. The reason is that, first, when machining a male screw, a thread groove is formed on the outer periphery of the material to be machined while rotating it around a shaft, but the pump casing 2 is stably rotated around a shaft other than the central shaft. It is difficult to do so, so accurate male threading is not practical. On the other hand, since the priming faucet 10 can be easily rotated stably around the central axis CA, highly accurate male thread processing is possible. When processing a female thread, it is not necessary to rotate the material to be processed, so that it is possible to process a thread with high accuracy on both the priming inlet 6 side and the priming faucet 10 side. Therefore, it is advantageous that the threaded portion 13 of the priming faucet 10 is a male thread and the priming water inlet 6 is provided with a female thread. Further, when the diameter of the priming water inlet 6 is the same, it is better to use a male screw for the threaded portion 13 of the priming faucet 10 and a female screw for the priming water injection port 6 than in the opposite case. The outer diameter can be reduced.

Further, FIG. 4 shows a neck portion 19 interposed between the head portion 11 and the screw portion 13 of the priming faucet 10, and an O-ring 20 arranged around the neck portion 19. Unlike the threaded portion 13, no thread groove is formed on the neck portion 19. The O-ring 20 seals between a gasket (not shown) provided around the priming water inlet 6 and the head 11 of the priming faucet 10. As described above, since it is necessary to attach the priming faucet 10 to the priming water inlet 6 to seal the pump casing 2 while the pump 1 is in operation, a sealing member such as an O-ring 20 is provided. The O-ring 20 may be provided in combination with the priming faucet 10.

FIG. 5 is a cross-sectional view of the priming faucet shown in FIG. 3 in a state in which a tool for rotating the priming faucet is inserted. FIG. 6 is a view showing a cross section of a conventional faucet similar to that of FIG. Referring to FIG. 5, a rod-shaped tool 21 is inserted between the two protrusions 14 in order to rotate the priming faucet 10 according to the present embodiment. At this time, as shown in the drawing, the tool 21 comes into contact with the outer peripheral side convex portion 15 of one protrusion 14 and the central side convex portion 17 of the other protrusion 14. When the force F indicated by the arrow is applied to the tool 21 in this state, the torque around the central axis CA is applied to the priming faucet 10 with the above-mentioned contact portions (outer peripheral side convex portion 15 and central side convex portion 17) as action points. Occur.

On the other hand, referring to FIG. 6, in order to rotate the conventional priming faucet 90, a rod-shaped tool 21 similar to the example of FIG. 5 is inserted between the two protrusions 94. Since the protrusion 94 has a substantially rectangular shape in the cross section, the tool 21 abuts on the central convex portion 95 of each protrusion as shown in the drawing. When the force F indicated by the arrow is applied to the tool 21 in this state, a torque around the central axis CA is generated in the priming faucet 90 with the contact portion (center side convex portion 95) as an action point.

Here, comparing the example of FIG. 5 and the example of FIG. 6, in the example of FIG. 5, since the outer peripheral side convex portion 15 of the protrusion 14 is located near the outer circumference of the head 11, from the central axis CA The distance d1 to the point of action of the force increases. Therefore, the torque generated in the priming faucet 10 can be increased with respect to the force F pushing the tool 21. On the other hand, in the example of FIG. 6, since the central convex portion 95 of the protrusion 94 is located near the central axis CA, the distance d2 from the central axis CA to the point of action of the force is small. Therefore, the torque generated in the priming faucet 90 becomes smaller with respect to the force F pushing the tool 21. That is, in the priming faucet 10 according to the present embodiment, when the priming faucet 10 is rotated by using the tool 21 as in the illustrated example, a smaller force F is applied as compared with the case of the conventional priming faucet 90. The priming faucet 10 can be rotated simply by adding it to the tool 21.

Further, as described above, the pressing surface 16 of the protrusion 14 has an ergonomically designed shape, for example, a concave surface, so that the protrusion 14 is rotated after the user has rotated the priming faucet 10 to some extent using the tool 21. It becomes easy to further rotate the priming faucet 10 by hand until it can be removed by pressing a finger against the pressing surface 16 of the above.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the technical scope of the present invention is not limited to such examples. It is clear that a person having ordinary knowledge in the technical field of the present invention can come up with various modifications or modifications within the scope of the technical ideas described in the claims. Of course, it is understood that the above also belongs to the technical scope of the present invention.

1 Pump 2 Pump casing 3 Suction port 4 Discharge port 5 Motor 6 Stimulation inlet 10 Stimulation faucet 11 Head 12 Top surface 13 Threaded part 14 Protrusion 15 Outer peripheral side convex part 16 Pressing surface 17 Central side convex part 18 Outer outer part 19 Neck 20 O-ring 21 Tool

Claims (5)

A priming faucet that includes a head and a threaded portion, wherein the threaded portion is screwed into a priming water inlet provided in a pump casing.
With a pair of protrusions provided on the head
In the cross section where the shape of each protrusion is normal to the central axis of the priming faucet,
A pair of outer peripheral convex portions formed at a position close to the outer circumference of the head so as to form a point of action of a tool force passed between the pair of protrusions .
A pair of side portions extending from each outer peripheral side convex portion toward the central axis side and not intersecting a straight line connecting the outer peripheral side convex portions and the central axis, and a position where the pair of side portions intersect each other. A priming faucet containing a central convex part formed in. The priming faucet according to claim 1, wherein at least one of the pair of sides has an ergonomically designed shape. The priming faucet according to claim 2, wherein the ergonomically designed shape is a shape curved on the side opposite to the straight line closest to each side portion. The priming faucet according to any one of claims 1 to 3, wherein the threaded portion is a male screw and is screwed with a female screw provided at the priming water inlet. A pump including the priming faucet according to any one of claims 1 to 4.

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