JPH025102Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is used in an electric well pump that accumulates pressure in a pressure tank and then discharges the fluid discharged from the pump body.

(b) Prior Art In the structure of a conventional electric well pump, as shown in FIGS. 1 and 2, fluid is sucked into the pump body 2 from the suction port 1, pressurized by the impeller 3, and pumped through the joint pipe 4. The inflow fluid flows into the pressure tank 6 through the passage 5, the pressure of the inflow fluid is accumulated in the pressure tank 6, and the accumulated pressure is discharged from the outlet 7 through the discharge passage 8 in the joint pipe 4. There is an inconvenience in that the air is discharged straight upwards from 9 and ejects onto the water surface and disturbs the water surface.In this inconvenience, the upper air dissolves into the disturbed water surface, and the upper air reaches the outlet 7 along with the turbulent water surface. Descend and
There is a risk that this air will leak out of the pressure tank 6 along with the fluid, and in order to eliminate this risk of air leakage, a contact plate 10 is provided, and this contact plate 10 blocks the inflowing fluid just before the water surface to prevent disturbance of the water surface. It was being prevented. Further, the air supplied from the air replenisher 11 is pressed against the wall surface 5a side along with the water flow by the counterclockwise rotation of the impeller 3, and is mainly replenished from the inlet 9a on the arrow A side. In order to prevent supplementary air from leaking into the outlet 7, the casting core 4a of the joint pipe 4 is made to protrude from the inlet 9a by a distance (the distance indicated by the arrow h), and the upper end opening 4b of the casting core 4a is The structure was made complicated for the purpose of deflecting in the opposite direction to the inlet 9a.

However, in the conventional device, since the backing plate 10 is attached like a beam to the inner surface of the pressure tank 6, when painting the inner surface of the tank (particularly powder coating), the shadow covered by the backing plate 10 is removed. This has the disadvantage that the inner surface cannot be coated uniformly, and that the backing plate 10 itself is very large, which increases the cost accordingly.Furthermore, the joint pipe 4 is In order to prevent leakage to the outflow port 7, the distance h between the inflow ports 9 is set larger than the dimension w of the inflow port 9a, and the upper end opening 4b is made into a deflected shape, so that only the protruding extension h of the core 4a is formed. Furthermore, the structure and manufacturing work of this joint pipe 4 are complicated by the deflection shape of the upper end opening 4b, and in particular, regarding the manufacturing work of this joint pipe 4, it is necessary to fill the inside of the narrow inlet 9 with casting sand by the size h. The molten metal for the core 4a is now poured into a high heap, and the wall thickness of the core 4a becomes partially thin due to the core 4a tilting or changes in injection pressure during pouring of the molten metal. There were drawbacks such as casting defects and increased machining man-hours and material costs.

(c) Purpose of the invention In view of the above-mentioned points, this invention is based on the separation distance h.
By omitting the protruding core, the joint pipe provided with the core and the structure of the electric well pump can be simplified and manufactured easily.

(d) Structure of the device This device integrates a pressure feeding passage and a discharge passage into a joint pipe connected to the pump body, and connects both passages adjacent to each other to the opening of the pressure tank. An electric well pump configured to discharge fluid discharged from the main body through the pressure feeding passage, the pressure tank, and the discharge passage, wherein a part of the seal packing interposed between the pressure tank and the joint pipe is inserted into the tank. The extended portion covers the open end of the pressure feeding passage, and the extended portion is provided with a discharge opening spaced apart from the open end of the discharge passage and in a direction parallel to the pressure tank surface. This is what happens.

(E) Embodiment In FIG. 3, reference numeral 12 denotes a pump body, which is formed in the same manner as the pump body 2 of the conventional example. 13 is a joint pipe connected to the pump body 12, 14 is a joint pipe 1
This is a pressure tank connected to 3. The joint pipe 13 is
A pressure feeding passage 15 and a discharge passage 16 are integrally formed. Both passages 15 and 16 are connected to the opening 14a of the pressure tank 14 in an adjacent state, so that an inlet 17 of the pressure tank 14 is formed in the opening 14a.
and an outlet 18. The pressure tank 14 functions to accumulate pressure of fluid that has flowed in from the pump body 12 side through the pressure feeding passage 15 and discharge it through the outlet 18 and the discharge passage 16. Also,
The opening end 15a of the pressure feeding passage 15 and the opening end 16a of the discharge passage 16 are formed flush with each other. 19 is the communication port 17, 1 of the pressure tank 14
8 and the joint pipe 13, as shown in FIG.
Openings 21 and 2 correspond to 7 and outlet 18, respectively.
2 is formed. And seal packing 19
extends a part of it into the pressure tank 14, and this extension part 23 connects the opening end 15a of the pressure feeding passage 15.
This extension part 23 is provided with discharge openings 24 and 25 spaced apart from the open end 16a of the discharge passage 16 and parallel to the pressure tank surface. The extension part 23 stands up integrally from each of the opposing edges of the opening 21 and has an L-shaped longitudinal section, and extends from the discharge opening 2 on both sides thereof.
4 and 25 are spaced apart from the tank outlet 18 and are oriented in a direction parallel to the pressure tank surface. Therefore, the fluid flowing in from the inlet 17 flows into the extension part 2.
3, the flow is deflected in a direction away from the outlet 18 of the tank, and flows along the surface of the pressure tank, during which the flow velocity becomes relaxed, and the pressure passage 1
Unlike the case of straight jetting from 5 to the water surface above, the ripples on the water surface are prevented,
Therefore, in the seal packing 19, the inlet 1
It becomes possible to prevent air leakage directly from the water outlet 7 to the outlet 18 as well as air leakage due to air dissolving into the disturbed water surface. Therefore, in the structure of the electric well pump, the seal packing 19 also serves as the air leakage prevention function of the conventional backing plate, and this backing plate can be omitted. Further, the seal packing 19 is attached to the pressure tank 14 by inserting bolts (not shown) into attachment holes 26 and 27.

FIG. 5 shows a seal packing 28 provided in another embodiment of this invention.
The extension part 29 has a U-shaped cross section in the transverse direction, and has a discharge opening 30 in only one direction,
It is attached to the pressure tank 14 in the same manner as the seal packing 19. In other embodiments, other parts not explained are configured in the same manner as in the above-mentioned embodiment.

(f) Effects of the device This device is constructed as described above, and a part of the seal packing is extended into the tank, and this extension covers the inlet of the pressure tank (opening end of the pressure feeding passage). Since a discharge opening is provided in this extension part in a direction that is spaced apart from the outlet of the pressure tank (opening end of the pressure-feeding passage) and parallel to the pressure tank surface,
The fluid flowing into the pressure tank is deflected away from the tank's outlet and flows along the pressure tank surface, at which time the flow velocity is relaxed, and it is ejected straight from the inlet to the water surface above. Unlike the case where the water surface is rippled, the seal gasket prevents air from directly leaking from the inlet to the outlet of the tank, or from air dissolving into the disturbed water surface. Leakage can also be prevented, and the casting core and large backing plate for securing the separation distance h in the conventional example for preventing leakage of make-up air can be omitted. To provide a structure of an electric well pump whose structure and manufacturing are simple due to the omission of the large backing plate, and where the tank inner surface can be easily painted without using the large backing plate as an obstacle.

[Brief explanation of drawings]

Figures 1 and 2 show conventional examples, Figure 1 is a partial sectional view seen from the front, Figure 2 is a partial sectional view viewed from the side, and Figure 3 is an embodiment of this invention. FIG. 4 is a perspective view of a part of the same embodiment, and FIG. 5 is a perspective view of one part of another embodiment. 12...Pump body, 13...Joint pipe, 14...
...pressure tank, 14a...opening, 15...pressure feeding passage, 15a...opening end, 16...discharge passage, 1
6a... Opening end, 17... Inflow port, 18... Outflow port, 19, 28... Seal packing, 23, 29
...Extension portion, 24, 25, 30...Discharge opening.

Claims (1)

[Claims for Utility Model Registration] A pressure feeding passage and a discharge passage are integrally molded on a joint pipe connected to the pump body, and both passages are connected to the opening of the pressure tank in an adjacent state, whereby the pump body An electric well pump configured to discharge fluid through the pressure feeding passage, the pressure tank, and the discharge passage, wherein a part of the seal packing interposed between the pressure tank and the joint pipe is extended into the tank. The extension part covers the opening end of the pressure feeding passage, and the extension part is provided with a discharge opening spaced apart from the opening end of the discharge passage and in a direction parallel to the pressure tank surface. The structure of an electric well pump featuring: