CN219333026U

CN219333026U - Device for overspeed protection of mechanical pumping type foam proportional mixing device

Info

Publication number: CN219333026U
Application number: CN202320689989.6U
Authority: CN
Inventors: 吴海卫; 贺源
Original assignee: Kunshan Pudong Fluid Equipment Co ltd; Shanghai Pudong Special Fire Fighting Equipment Co ltd
Current assignee: Kunshan Pudong Fluid Equipment Co ltd; Shanghai Pudong Special Fire Fighting Equipment Co ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-07-14
Anticipated expiration: 2033-03-31

Abstract

The utility model relates to the technical field of machine fire extinguishing systems, in particular to a device for overspeed protection of a mechanical pumping type foam proportional mixing device. The device comprises a foam generating device, a plurality of foam proportion mixing devices connected in parallel with the foam generating device through pipelines and a main water supply pump connected with the foam proportion mixing devices, wherein the foam proportion mixing devices comprise a water turbine and foam pumps connected with the water turbine, the inlet end and the outlet end of the water turbine are respectively externally connected with a first pipeline and are communicated with each other, and a differential pressure bypass valve is arranged on the first pipeline. The utility model has the advantages that: according to the technical scheme, the differential pressure bypass valve structure is added to the mechanical pumping type foam proportional mixing device, so that the problem that the mixing device is damaged due to overspeed operation is solved, and the purpose of protecting equipment is achieved.

Description

Device for overspeed protection of mechanical pumping type foam proportional mixing device

Technical Field

The utility model relates to the technical field of machine fire extinguishing systems, in particular to a device for overspeed protection of a mechanical pumping type foam proportional mixing device.

Background

In the prior art, because the flow rate of the foam pump proportional mixing device is limited, a plurality of sets of foam proportional mixing devices can be used in parallel in a practical large project, and the effect of expanding the flow rate is achieved. For example: there are three sets of mechanical pumping foam proportional mixing devices, a single set of maximum flow is 100L/S, and the actual maximum flow on site is 300L/S. In order to meet the actual requirements of the project, three mechanical pumping type proportional mixing devices are needed to be used in parallel.

In the actual use process, once a certain set of electric ball valve of the mechanical pumping type front section cannot be opened or the hydraulic turbine is blocked and does not rotate, other devices which normally operate can operate in an overflow mode, the flow of the mechanical pumping type proportional mixing device and the rotating speed are in a linear relation, and the rotating speed is increased along with the gradual increase of the flow. It may cause structural damage due to overspeed operation, and thus it is necessary to design a device for overspeed protection of a mechanical pumping type foam proportional mixing device to solve the above problems.

Disclosure of Invention

The utility model aims to provide a device for overspeed protection of a mechanical pumping type foam proportional mixing device, which overcomes the defects in the prior art.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

an apparatus for overspeed protection of a mechanical pumped foam proportioning device, comprising a foam generating device, a plurality of foam proportioning devices connected in parallel with the foam generating device through pipelines, and a main water supply pump connected with the foam proportioning devices, characterized in that: the foam proportion mixing device comprises a water turbine and a foam pump connected with the water turbine, wherein the inlet end and the outlet end of the water turbine are respectively externally connected with a first pipeline, the first pipelines are communicated with each other, and a differential pressure bypass valve is arranged on the first pipeline.

Preferably, the inlet end of the water turbine is provided with an inlet electric ball valve, and the outlet end of the water turbine is provided with an outlet check valve.

Preferably, pressure sensors are further provided at the inlet end and the outlet end of the water turbine.

The beneficial effects of the utility model are as follows: according to the technical scheme, the differential pressure bypass valve structure is added to the mechanical pumping type foam proportional mixing device, so that the problem that the mixing device is damaged due to overspeed operation is solved, and the purpose of protecting equipment is achieved.

Drawings

FIG. 1 is a schematic diagram of an apparatus for overspeed protection of a mechanically pumped foam proportioning device in accordance with the present utility model;

FIG. 2 is a schematic opening diagram of an apparatus for overspeed protection of a mechanically pumped foam proportioning device of the present utility model;

FIG. 3 is a system block diagram of an apparatus for overspeed protection of a mechanically pumped foam proportioning device of the present utility model;

in the figure: 1. a foam generating device; 2. a pipeline; 3. a foam ratio mixing device; 4. a main water supply pump; 31. a water turbine; 32. a foam pump; 33. an inlet electric ball valve; 34. an outlet check valve; 5. a first pipeline; 6. a differential pressure bypass valve.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to fig. 1 to 3, an apparatus for overspeed protection of a mechanical pumping type foam proportioning device comprises a foam generating device 1, a plurality of foam proportioning devices 3 connected in parallel to the foam generating device 1 through a pipeline 2, and a main water supply pump 4 connected to the foam proportioning devices 3, wherein the foam proportioning devices 3 comprise a water turbine 31 and a foam pump 32 connected to the water turbine 31;

an inlet electric ball valve 33 arranged at the inlet end of the water turbine 31 and an outlet check valve 34 arranged at the outlet end of the water turbine 31;

the inlet end and the outlet end of the water turbine 31 are respectively externally connected with a first pipeline 5, the first pipelines 5 are communicated, and a differential pressure bypass valve 6 is arranged on the first pipeline 5;

pressure sensors are also arranged at the inlet end and the outlet end of the water turbine 31 and are used for sensing the pressure values at the front end and the rear end, so that the pressure sensors are effectively matched with a differential pressure bypass valve to switch.

When the mechanical pump-in foam proportion mixing device is operated, the pressure difference at the inlet and the outlet of the water turbine 31 is gradually increased along with the increase of the flow, and when the mechanical pump-in foam proportion mixing device is operated at the maximum design flow, the pressure difference at the inlet and the outlet of the water turbine is assumed to be delta P. Above maximum flow, the inlet-outlet pressure differential will also exceed ΔP. The differential bypass valve opening pressure on the first line is thus set to Δp.

When the device is in overspeed operation, the pressure difference exceeds delta P, at the moment, the pressure difference bypass valve 6 on the first pipeline 5 is opened, and part of water passes through the first pipeline 5 (not through the water turbine 31 on the main pipe), so that the water flow passing through the water turbine 31 is reduced, the rotating speed of the water turbine 31 is reduced, and the purpose of protecting equipment is achieved.

Specifically, the differential pressure bypass valve 6 opening pressure is set to: Δp; the differential pressure between the inlet and the outlet of the water turbine 31 is as follows: Δp1; when Δp1 < Δp, the differential pressure bypass valve 6 is closed and the water passes through the water turbine 31 entirely. When DeltaP 1 is more than or equal to DeltaP, the differential pressure bypass valve 6 is opened, and part of water passes through the differential pressure bypass valve 6, so that the fire water flow passing through the water turbine 31 can be reduced, the rotating speed of the water turbine is reduced, and the purpose of protecting equipment is achieved.

The utility model has the advantages that the technical scheme solves the problem that the mixing device is possibly damaged due to overspeed operation by adding the differential pressure bypass valve structure to the mechanical pumping type foam proportional mixing device, thereby achieving the purpose of protecting equipment.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. An apparatus for overspeed protection of a mechanical pumped foam proportioning device, comprising a foam generating device, a plurality of foam proportioning devices connected in parallel with the foam generating device through pipelines, and a main water supply pump connected with the foam proportioning devices, characterized in that: the foam proportion mixing device comprises a water turbine and a foam pump connected with the water turbine, wherein the inlet end and the outlet end of the water turbine are respectively externally connected with a first pipeline, the first pipelines are communicated with each other, and a differential pressure bypass valve is arranged on the first pipeline.

2. An apparatus for overspeed protection of a mechanical pumped foam proportioning device of claim 1, wherein: the inlet end of the water turbine is provided with an inlet electric ball valve, and the outlet end of the water turbine is provided with an outlet check valve.

3. An apparatus for overspeed protection of a mechanical pumped foam proportioning device of claim 1, wherein: pressure sensors are also arranged at the inlet end and the outlet end of the water turbine.