CN201236359Y - Full-automatic dual frequency laminating water supply equipment - Google Patents

Abstract

The utility model relates to a fully automatic double frequency conversion superimposed pressure water supply equipment, which is characterized in that: a double frequency conversion control cabinet (15) composed of two frequency conversion water supply systems controls two sets of water pump units (16) and (17), and the water pump unit ( 16) The water inlet main pipe (10) is sequentially connected to the backflow preventer (8), the pipeline filter (7), the municipal water supply pipe (26), and the water inlet main pipe (22) of the water pump unit (17) is connected to the water tank (1) Water outlet, the water outlet main pipe (23) of the water pump unit (17) is connected with the water supply pipe of the user after the check valve (19) and the water outlet main pipe (18) of the water pump unit (16) in turn, and the water supply pump (20) and (21) , pressure sensors (13) and (14), electric contact pressure gauge (12), water level controller (4) are respectively connected with double frequency conversion control cabinet (15). In the non-negative pressure double frequency conversion water supply equipment of the utility model, the two groups of water pump units work in coordination during the peak period of water consumption for users or when the municipal water supply is cut off for a short time, so as to meet the normal water consumption of users under the state of no negative pressure. It has the characteristics of safe and reliable water supply, no secondary pollution, no negative pressure, energy saving, convenient maintenance, etc., and is widely applicable to various secondary pressurized water supply.

Description

Fully automatic double frequency conversion superimposed pressure water supply equipment

Technical field

The utility model relates to a secondary pressurized water supply equipment, in particular to a current-limiting constant-pressure fully automatic double frequency conversion superimposed pressure water supply equipment which can be directly connected with a municipal water supply pipe network.

Background technique

The current stacked water supply equipment has the advantages of small footprint, no secondary pollution, and energy saving. However, there are some disadvantages: the structure of steady-flow irrigation is complicated, maintenance is difficult, the adjustment volume is small, and the normal water supply maintenance time is very short during the peak water consumption period. Some superimposed water supply equipment only implement the flow-limiting water supply mode or the pressure-reducing water supply mode during the peak water consumption period, which will affect the normal water use of users. The front water tank is used as a superimposed water supply equipment to supplement the water source. Its structure is that the water inlet of the water tank is connected to the municipal water supply pipe, and the water outlet is connected to the water pump unit. When the water pump unit starts pumping the water in the tank during the peak water consumption period, because the pressure of the water tank and the municipal water supply network is equal, the water in the pumping tank also pumps the water of the municipal water supply network, which affects the pressure and flow of the municipal water supply network. This water tank can not play the effect of pressure relay like this, can only play the effect of common water tank, and adjustment volume is limited, and cost is high.

Contents of the invention

The purpose of the invention of the utility model is to solve the above-mentioned problems existing in the non-negative pressure water supply equipment in the prior art, and to provide a fully automatic double frequency conversion superimposed pressure water supply equipment with limited flow and constant pressure for water supply.

The technical solution to realize the purpose of the invention: the double frequency conversion control cabinet 15 composed of two sets of frequency conversion water supply systems controls two sets of water pump units 16 and 17, and the water inlet main pipe 10 of the water pump unit 16 is sequentially connected with the backflow preventer 8, the pipeline filter 7, the municipal The water supply pipe 26, the water inlet main pipe 22 of the water pump unit 17 is connected to the outlet pipe of the water tank 1, the water outlet main pipe 23 of the water pump unit 17 is connected to the check valve 19 and the water outlet main pipe 18 of the water pump unit 16 in turn, and then connected to the user's water supply pipe, and the replenishment pump 20 And 21, pressure sensors 13 and 14, electric contact pressure gauge 12, electromagnetic valve 5, water level controller 4 are connected with double frequency conversion control cabinet 15 respectively.

The utility model has the beneficial effects of energy saving, no negative pressure, no secondary pollution, convenient maintenance, and reliable normal constant-pressure water supply to users when the municipal water supply network is in a small flow state or short-term water cut-off.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Detailed ways

As shown in Figure 1, the structure of the utility model is composed of water tank 1, exhaust-suction valve 2, air filter 3, water level controller 4, water inlet valve 5, ball float valve 6, overflow pipe 24, check The closed non-pressure water tank composed of valve 25 and two water pump units 16 and 17, the bypass pipeline 11, the electric contact pressure gauge 12 and the pressure sensor 13 connected to the water inlet main pipe 10 of the water pump unit 16 are the water outlet of the water pump unit 16 It consists of a pressure sensor 14 connected to the main pipe, a double frequency conversion control cabinet 15 and the like. Double frequency conversion control cabinet 15 is connected with water level controller 4, electric contact pressure gauge 12, pressure sensors 13 and 14, water supplement pumps 20 and 21, and controls the system to supply water to users.

In use, tap water passes through the pipeline filter 7 and the backflow preventer 8, and then supplies water to users through the water pump unit 16, the water pump unit 17 and the bypass pipeline 11. The other way fills the water tank with water through the water tank inlet pipe 9, the water tank water inlet valve 5 and the float valve 6, and the air in the water tank is ventilated outwards by the row-suction valve 2 and the air filter 3. When the float valve 6 is damaged and causes the water tank to continue to enter water and reach the full water level of the water tank, the row-suction valve 2 is closed, and the water in the water tank is drained outwards by the water tank overflow pipe 24 and the check valve 25, so as to avoid the pressure of the water tank. When the water tank water level reached the lower limit water level of the water level controller, the controller sent a control signal to stop the water pump unit 17. According to the user's water requirements, the size of the water tank, the size of the equipment and the number of replenishment pumps are correctly selected to reliably meet the water requirements required by the user. The water tank adopts a closed unpressurized water tank, which has low cost and no secondary pollution.

The double frequency conversion control cabinet 15 is made up of two sets of frequency conversion water supply systems and controllers, one set of frequency conversion water supply system controls the water pump unit 16, and the other set of frequency conversion water supply system controls the water pump unit 17.

During the operation of the equipment, when the municipal water supply pressure and flow can meet the user's water pressure and water consumption requirements, the equipment directly supplies water to the user through the bypass pipeline 11 . When the municipal water supply pressure and flow cannot meet the user's water pressure and water consumption requirements, the system compares the pressure value of the water inlet pressure sensor 13 with the set pressure value of the equipment startup, and then the controller gives a startup signal to control the water pump unit 16 to run automatically , and the pressure sensor 14 is used as the pressure feedback, and the outlet pressure setting value is used as the target to control the frequency conversion operation of the supplementary water pump 20 to supply users with constant pressure and superimposed water supply.

When the user's water consumption during the peak period of user water consumption is greater than the municipal water supply limit, the pressure value of the pressure sensor 13 drops to the set value of the flow-limiting pressure, the controller sends a signal to make the water pump unit 16 use the pressure sensor 13 as pressure feedback, and Taking the set value of the flow-limiting pressure at the water inlet of the water pump as the target, increase or decrease the number of water pumps 20 and change the rotational speed of the water pumps to supply water to users with limited flow. At the same time, the controller gives a control signal to make the water pump unit 17 use the pressure sensor 14 as pressure feedback, and take the set value of the outlet pressure as the target, increase or decrease the number of water pumps 21 and change the speed of the water pumps to supply users with constant pressure water. Because the difference between the water supply volume of tap water and the pumping volume of the water pump 20 is proportional to the pressure value of the water inlet of the water pump, the water pumping volume of the water pump is adjusted to keep the pressure of the water inlet of the water pump, that is, the difference between the municipal water supply volume and the water pumping volume of the water pump To achieve the purpose of limiting the flow of water supply. If the municipal water supply network supplies more water, the pumps will pump relatively more, and if the supply is less, the water pumps will also pump relatively less, and the pressure at the end of the municipal water supply pipe network has always been kept above the set value of the current limiting pressure, so that the water pump unit 16 is truly It runs in the state of superimposed relay and no negative pressure water supply.

When the user's water consumption is greater than or less than the municipal water supply, the frequency of the variable frequency pump of the water pump unit 17 decreases, and when it drops to the lowest frequency, the controller sends a control signal to reduce the number of running water pumps to one pump with variable frequency operation. The controller provides a shutdown signal, so that the water pump unit 17 is shut down. At the same time, a switching signal is sent to make the water pump unit 16 use the pressure sensor 14 as pressure feedback, and the outlet pressure setting value as the target to control the frequency conversion operation of the supplementary water pump 20 to supply water to users at a constant pressure.

When the municipal water supply is cut off, the pressure value of the pressure sensor 13 drops, and the frequency of the frequency conversion pump of the water pump unit 16 drops. 16 can not be stopped, and the lower limit of the electric contact pressure gauge 12 is used to forcibly control the water pump unit 16 to stop, so as to prevent the municipal water supply network from producing negative pressure. When the pressure value of the pressure sensor 13 drops to the set value of the flow-limiting pressure, the controller gives a signal to make the water pump unit 17 use the pressure sensor 14 as pressure feedback, and take the set value of the outlet pressure as the target to increase or decrease the number of water pumps 21 and Change the speed of the water pump to continue the constant pressure water supply to the user.

Claims (2)

1. A fully automatic double frequency conversion superimposed pressure water supply equipment, which is composed of a water pump unit, a water tank, and a double frequency conversion control cabinet. It is characterized in that: the double frequency conversion control cabinet (15) composed of two sets of frequency conversion water supply systems controls two sets of water pump units (16) and (17), and the water inlet main pipe (10) of the water pump unit (16) is sequentially connected to the backflow preventer ( 8), pipeline filter (7), municipal water supply pipe (26), the water inlet main pipe (22) of the water pump unit (17) is connected to the water outlet of the water tank (1), and the water outlet main pipe (23) of the water pump unit (17) in turn Connect the check valve (19) and the water outlet main pipe (18) of the water pump unit (16) to the user's water supply pipe, make up water pumps (20) and (21), pressure sensors (13) and (14), and electric contact pressure gauges (12), water level controller (4) are connected with double frequency conversion control cabinet (15) respectively. 2. The fully automatic double frequency conversion superimposed pressure water supply equipment according to claim 1, characterized in that: the double frequency conversion control cabinet uses two frequency converters.