JPH03168393A - Pump device - Google Patents

Abstract

PURPOSE:To manufacture a switch body with ease and stabilize the operation of a flow switch by forming the flow switch in the first flow passage which communicates with two openings of the switch body and forming a bypass via a resistance valve in the second flow passage. CONSTITUTION:Water flow discharged from a pump part 1 is split in branches through two openings 2, 3 and flow in the first and the second flow passages 9, 10 of a switch body 8, so that the first flow passage 9 forms a flow switch 11 which reacts on water flow. The second flow passage 10, is a bypass equipped with a resistance valve, and water flowing in the second flow passage 10 is subjected to pressure difference caused by the resistance valve and its part is split into the first flow passage 9. In this way, as water split into the first flow passage 9 is proportional to pressure caused by the resistance of the resistance valve, the cross section of the second flow passage 10 is made larger so that a large quantity of water can flow, and the resistance of the resistance valve is set to send necessary water to the flow passage 9. It is thus possible to obtain the arbitrary quantity of water for operation of the flow switch 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pump device that is equipped with a flow rate switch at the discharge port of a pump section to control its operation. [Prior Art] Pump devices that are equipped with a flow rate switch at the discharge port of the pump section to control operation tend to become difficult to control when the ratio of maximum water volume to minimum water volume to 1 becomes large.

That is, if it is ovalized so as not to cause water flow resistance when the amount of water is large, it will not be possible to obtain sufficient operational sensitivity of the flow rate switch when the amount of water is small.

This is because in the case of a flow rate switch that operates based on changes in water flow, in order to reduce the minimum amount of water that operates, the influence on the water flow channel must be increased so that the operating elements of the flow switch operate at the minimum amount of water. In this case, if the minimum amount of water is made small, a problem arises in that when the amount of water is large, resistance is created to the water flow due to the effect of the flow rate switch.

In the part of the IR4 structure where a large amount of water passes through like this, it is difficult to obtain sufficient sensitivity for the flow rate switch, so a bypass is formed and a resistance valve is installed, so that the flow is controlled by the flow rate switch measurement by the pressure difference between the resistance valves. Attempts are being made to improve the precepts.

In this case, water flow resistance can be reduced by increasing the inner diameter of the bypass, and the sensitivity of the flow rate switch can be arbitrarily set by the pressure of the resistance valve.

[Problems to be Solved by the Invention] However, unless the two channels are integrated, the structure becomes complicated and assembly is not easy.

However, when the two flow channels are made of cast metal or resin, the mold becomes complicated and molding is not easy. The present invention was made in view of these circumstances, and
It is an object of the present invention to provide a pump device that has a structure in which a flow rate switch integrally equipped with a bypass is easily manufactured in relation to a pump section.

Means for Solving the L Problems The present invention forms the discharge port of the pump section with two openings that are attached together, and provides a switch body that is integrally attached to these two openings. forming a first flow path and a second flow path that communicate with the two openings, respectively;
The problem is solved by forming a flow rate switch in the first flow path and forming a bypass via a resistance valve in the second flow path.

[Operation] The water flow discharged from the discharge port of the pump section is divided from two openings and flows through the first flow path and the second flow path of the switch body. A flow rate switch is formed in the first flow path, and the switch responds to the water flow.

The second flow path is a bypass equipped with a resistance valve, and since the water flowing through the second flow path creates a pressure difference due to the resistance valve, a portion of the water is diverted to the first flow path. It turns out.

Since the water flow divided into the first flow path is proportional to the pressure generated by the resistance of the resistance valve, the cross-sectional area of the second flow path is increased to allow a large amount of water to pass through. By setting the resistance of the valve so that the required amount of water flows into the first flow path, the operating amount of water for the flow rate switch can be arbitrarily obtained.

Although such a switch body includes a first flow path and a second flow path, since two openings of the pump part are formed and combined, the first flow path and the second flow path are The production becomes easier.

That is, the first
This improves manufacturing convenience, such as machining the flow path and the second flow path, or making it easier to cut out a core for casting or a certain mold when molding with resin. [Example] The present invention will be described based on an example shown in the drawings. FIG. 1 is an exploded view showing the structure of a pump device according to an example of the present invention, and FIG. FIG. 2 is a plan view of the switch body.

In FIG. 1, solid lines connecting parts indicate the direction of assembly.
The openings 2 and 3 each form a discharge port that communicates with the inside of the pump section 1. The pump section 1 is equipped with a motor 4 at the rear thereof, and is connected to an impeller (not shown) inside the pump section 1.

Furthermore, a water intake port 5 is formed in the front part of the pump part 1, and is connected to a water source such as a well through a pipe (not shown).

The water inlet 5 is also provided with a flange 6 and a packing 7 that are assembled in the direction of the solid line in the figure. A switch body 8 is configured to be attached to the upper openings 2 and 3, and the switch body 8 has a first flow path 9 and a second flow path facing the openings 2 and 3, respectively. A flow path 10 is formed, a flow rate switch 11 is formed in the first flow path 9, and a bypass via a resistance valve (not shown) is formed in the second flow path 10.

Check valves 12 and 13 are assembled in the first flow path 9 and the second flow path 10, respectively, along the solid lines in the figure.

The check valves 12 and 13 are each assembled through packing or the like, and the check valve 13 provided in the second flow path 10 has a spring 15 attached to a valve stem 14 to form a resistance valve. It is configured to do so. The flow rate switch 8 is provided with seven flange 17 attached via packing 16, and is configured to communicate with a terminal such as a faucet. Further, the second flow path 10 is configured to be attached with a pressure switch 18 .

In FIG. 2, the switch body 8 has a first i1i'
l}9 and a second flow path 10 are formed, and are configured to merge at the flange 17, respectively.

The first flow path 9 and the second flow path 10 are provided with check valves 12 and 13, respectively. This check valve 1
2 and 13 can be made of the same parts, and the second flow F
The valve stem 14 of #I10 is equipped with a spring 15,
It forms a resistance valve.

In such a configuration, in the pump device, when the pump section 1 is operated by the motor 4, water is pumped up and pressure water is discharged from the openings 2 and 3, which are discharge ports. A first flow path 9 and a second flow 1i'glo of a spinch body 8 are connected to each of the flow channels 3 and 3, and the flows are separated. Further, when the discharged water to be diverted flows into the second flow path 10, the flow rate switch 11 is operated to divert the water to the first flow path 9 according to the resistance of the resistance valve by the check valve 13 in the flow path. .

A signal is sent to a control circuit (not shown) by this flow rate switch 11, and the motor 4 is controlled and operated.

In this configuration, since the two openings 9 and 10 are formed in the pump portion 1, the structure of the switch body 8 can be simplified.

That is, the first flow path 9 and the second flow path are connected to the switch body 8.
The flange 17 is used to form the two flow passages 10.
There is only one flow path on the side, and the flow paths of the two pump parts can be made into an inclined straight line as shown in FIG. 2, so that they exit the mold from the flange 17 side. The check valves 12 and 13 are formed so that the valve rod 14 moves in different directions, so the flow paths are in different directions and die-cutting is performed in different directions.

This type of treetop remains is easy to manufacture, whether it is cast or molded with resin, as the mold can be easily removed. [Effects of the Invention] According to the present invention, since two discharge ports are formed in the pump section and the flow is divided into the switch body, the switch body can be manufactured easily and the operation of the flow rate switch can be improved. is stable, and its effects are extremely large in industry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view showing the structure of a pump device according to an embodiment of the present invention, and FIG. 2 is a plan view of a switch body. 1...Pump part, 2, 3...Opening, 14...
- Motor, 5... Water inlet, 8... Switch body, 9... First flow path, 10... Second flow path,
11...Flow rate switch, 12, 13...Reverse valve.

Claims (1)

[Claims] In a pump device that is equipped with a flow rate switch at the discharge port of the pump section to control operation, the discharge port of the pump section is formed by two openings, and a switch body is provided that is integrally attached to these two openings. , forming a first flow path and a second flow path that communicate with the two openings in the switch body, and forming a flow rate switch in the first flow path;
A pump device characterized in that a bypass is formed in the second flow path via a resistance valve.