JPS6224073Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump device, and more particularly to a pump device equipped with a relief valve and a bypass pipe for maintaining a substantially constant discharge pressure.

In order to keep the discharge pressure constant, devices that detect this discharge pressure and control the pump rotation speed generally have a complicated structure and large-scale equipment, which increases costs and is not suitable for small-scale water supply. It is unsuitable for equipment etc. In addition, in the case where a pressure reducing valve is used, the pressure reducing valve a can be installed almost directly above the pump 1 as shown in FIG. 1, which is convenient for supporting the weight of the pump 1.
Since the liquid flowing in the discharge pipe 2 must directly operate the valve body against the pressure control spring of the pressure reducing valve a, the head (H) - based on the flow resistance
Deterioration of the yield (Q) characteristics is inevitable (see Figure 4A).

In order to improve such problems, a bypass pipe 4 is interposed between the discharge pipe 2 and the suction pipe 3 of the pump 1, as illustrated in FIGS. 2 and 3, and the discharge pressure is In connection with this, some devices are provided with a relief valve b for controlling the flow rate in the bypass pipe 4. In this case, H-Q is superior to that in the case where a pressure reducing valve a is provided as illustrated in FIG. 4B.
characteristics can be obtained. However, in such a structure, the weight of the relief valve b must be supported via the bypass pipe 4, which causes a bending moment in the pipe system, which places an abnormal force on the pipe and the pump, causing damage to the pump shaft and motor shaft. Misalignment, etc. may occur,
There are problems such as shortened ball bearing life and generation of vibration and noise.

Also, normally the discharge pipe 2 rises from the outer circumference of the pump 1, whereas the suction pipe 3 protrudes in the axial direction of the pump 1, so the discharge pipe 2 and suction pipe 3 are eccentric to each other. In order to connect the bypass pipe 4, it is necessary to make a part of the piping oblique, which not only requires time and effort for assembly, but also makes it difficult to downsize the entire device. Incidentally, FIG. 4C shows the characteristics of the pump 1.

The present invention was developed under the above circumstances, and its purpose is to be able to reliably support bypass pipes and relief valves, and to have a simple structure, small size, and easy assembly. The purpose of the present invention is to provide a pump device.

The present invention includes a discharge flow passage section having one end connected to the discharge port of the pump body and the other end connected to the discharge pipe and having a communication hole on one side, and one end connected to the bypass pipe and the discharge flow path section having a communication hole opened on one side. providing a three-way tubular connecting member having a bypass flow path portion that is partitioned from and intersects with the flow path portion and whose eccentricity with respect to the discharge flow path portion substantially matches the eccentricity of the suction port and the discharge port;
The communication hole and the other end of the bypass passage portion form a valve chamber in communication with each other, and a valve body is provided in the valve chamber to open and close the communication hole by being actuated in relation to the internal pressure of the discharge passage. The present invention is characterized in that a relief valve provided therein is connected to the three-way tubular connecting member.

Therefore, according to the present invention, the lower end of the discharge flow path can be directly connected to the pump discharge port opening upward, and the relief valve can be located near the top of the pump body. , the weight can be supported reliably, no bending moment is generated on the piping system, and misalignment between the pump shaft and the motor shaft is prevented. In addition, since the bypass flow path intersects with the discharge flow path and is located eccentrically, piping assembly can be easily performed by setting the amount of eccentricity according to the amount of eccentricity between the discharge pipe and the suction pipe. can. Furthermore, since the relief valve is provided on one side of the discharge flow path, the entire device can be downsized by locating its protrusion on the same side as the pump drive motor. Moreover, since a bypass pipe and a relief valve are used, better HQ characteristics can be obtained than when a pressure reducing valve is used.

Hereinafter, the present invention will be described with reference to an illustrated embodiment. In FIGS. 5 and 6, a pump body 11 and a driving electric motor 12, which are attached to the front and rear parts of the base 10, respectively, are coaxially connected via a joint 13. The pump body 11 includes a discharge port 14 located on one side and rising from the outer circumference, and a suction port 15 located in the center and projected forward. A discharge passage portion 17 of a three-way tubular connecting member 16 is connected in series to the discharge port 14 . The bypass passage section 18 of the three-way tubular connecting member 16 is connected to the discharge passage section 1
The eccentricity d with respect to the discharge flow path section 17 corresponds to the eccentricity of the discharge port 14 and the suction port 15, and the tip extending forward extends through the bypass pipe 19. Through the suction port 15
It is connected to the. A relief valve 20 is attached to the discharge passage section 17 at the rear side.

The three-way tubular connecting member 16 and the relief valve 20
are integrally constructed as illustrated in FIGS. 7 and 8. The relief valve 20 includes a base 21, a lid 22, and a diaphragm 23 interposed between the two. The base portion 21 is provided with a valve chamber 25 and a control pressure chamber 26 partitioned by a partition wall 24 . The base end of the bypass passage section 18 opens into the valve chamber 25 through a through hole 18a, and the discharge passage section 18 opens into the valve chamber 25 through a communication hole 27 formed between the bypass passage section 18 and the discharge passage section 17. Seventeen internal chambers 28 are in communication. A valve body 29 facing the communication hole 27 in an openable and closable manner is connected to the diaphragm 23 via a valve rod 30 that slidably passes through the partition wall 24 . The base 21 is provided with a passage 31 that communicates the control pressure chamber 26 with the inner chamber 28 of the discharge passage section 17.
is provided. The lid body 22 includes a spring member 32 that presses the valve body 29 in the closing direction via the diaphragm 23 and the valve stem 30;
A screw member 33 for adjusting the elastic force is provided.

In the device configured as described above, the discharge pressure led from the inner chamber 28 of the discharge passage section 17 to the control pressure chamber 26 via the passage 31 is applied to the diaphragm 2.
3, the diaphragm 23 is displaced in response to fluctuations in discharge pressure to a position where this and the elastic force of the spring member 32 are balanced. The valve body 29 is interlocked with the diaphragm 23 via the valve rod 30, and increases or decreases the opening degree of the communication hole 27 in accordance with an increase or decrease in discharge pressure. Therefore, from the inner chamber 28 to the communication hole 27, the valve chamber 25, and the communication hole 1
8a, bypass passage section 18 and bypass pipe 19
The bypass flow rate flowing to the suction port 15 through the 15 is increased or decreased according to the increase or decrease in the discharge pressure, and the pressure of the liquid flowing out to the discharge pipe 34 through the discharge flow path section 17 is shown in FIG. 4B. As such, the flow rate is maintained approximately constant within a predetermined flow rate range.

According to the above configuration, the discharge passage section 17 of the three-way tubular connecting member 16 can be directly connected to the discharge port 14 of the pump body 11, and the relief valve 20 can be connected directly to the discharge port 14 of the pump body 11.
Since the pump body 11 can reliably support the weight of the three-way tubular connecting member 16, the relief valve 20, etc., the pump body 11 can prevent bending moments from being caused to the piping system. There is no possibility of misalignment between the pump shaft and the motor shaft. In addition, the discharge passage section 17 and the bypass passage section 18 are placed eccentrically, and the eccentricity d (see Fig. 7) is equal to the eccentricity between the discharge port 14 and the suction port 15 (see Fig. 6). Since it is set at an angle, there is no need to form a diagonal part in the piping, and assembly is easy. Furthermore, since the relief valve 20 is located on the rear side of the discharge passage section 17, its protrusion can be provided on the rear side of the pump body, that is, on the same side as the electric motor 12, making the entire device compact and compact. It can be configured as follows. Therefore, it is possible to provide a pump device particularly suitable for small-scale water supply devices and the like.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications and applications can be made within the scope of the gist of the present invention.

[Brief explanation of the drawing]

Figures 1 to 3 are side views showing different conventional examples, Figure 4 is a diagram comparing head-to-lift characteristics, and Figures 5 and 6 show an embodiment of the present invention. A front view and a side view, FIG. 7 is an enlarged front view of main parts, and FIG. 8 is a sectional view taken along the line - in FIG. 7. 11...Pump body, 14...Discharge port, 15...
... Suction port, 16... Three-way tubular connecting member, 17...
Discharge flow path section, 18... Bypass flow path section, 19...
Bypass pipe, 20... Relief valve, 23... Diaphragm, 25... Valve chamber, 26... Control pressure chamber, 27
...Communication hole, 28...Inner chamber, 29...Valve body.

Claims (1)

[Scope of utility model registration request] A pump body in which an upwardly opened discharge port crosses the suction port and is eccentrically opened, a bypass pipe interposed between the suction port side and the discharge port side of the pump body, and the discharge port. In a pump device having a relief valve that controls a flow path in the bypass pipe in relation to the internal pressure on the outlet side, one end is connected to the discharge port of the pump body, the other end is connected to the discharge pipe, and communicates with one side. a discharge flow path section having a hole;
a bypass flow path section having one end connected to the bypass pipe, partitioned from and intersecting with the discharge flow path section, and having an eccentricity with respect to the discharge flow path section that substantially matches the eccentricity of the suction port and the discharge port; a three-way tubular connecting member having a three-way tubular connection member having a valve chamber in which the communication hole and the other end of the bypass flow path are communicated with each other; A pump device characterized in that a relief valve having a valve body for opening and closing the communication hole is connected to the three-way tubular connecting member.