RU2754056C1 - Water-gas unit for instantaneous water heater - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: invention relates to gas technology and can be used in automation systems for gas heating and water heating devices. In a water-gas unit for a flow-through water heater, which has a water and gas compartments separated by a non-magnetic partition, a movable device located in the cavity of the water compartment, dividing it into a cavity of increased pressure and a cavity of reduced pressure, associated with a valve for limiting the water supply and receiving the water pressure difference created by the ejector, the delivery and suction leads of which are connected, respectively, with the cavity of increased and with the cavity of reduced pressure and a water flow rate regulator is installed on the suction outlet of the ejector, the movable device is connected through the magnetic field of the first magnet installed on it with the second magnet located in the gas cavity and oriented to it with the same pole of the same name, mechanically acting on the gas supply valve spring-loaded towards the saddle and acting on the valve position sensor gas supply, the movable device is made in the form of a piston connected to the first magnet with the possibility of axial movement through a spring installed between it and the magnet, and a reed switch located in the magnetic field of the second magnet is used as a position sensor.

EFFECT: increasing reliability of the device and accuracy of the operation of water and gas supply control systems.

1 cl, 1 dwg

Description

The invention relates to gas technology and can be used in automation systems for gas heating and water heating devices.

Known water-gas unit [Apparatus water-heating flow-through gas household. Operating manual 3251-00.000-01 OM. Armavir Gas Equipment Plant] containing a gas supply valve and a membrane regulator (stabilizer) for water supply, in which the gas supply valve is opened by acting on it through the membrane rod, provided that the water flow through the heat exchanger is guaranteed. In this case, the separation of the gas and water cavities is carried out by two gland seals installed on the stem. The disadvantage of this device is that when the seal is worn from the side of the gas cavity, the gas enters the room, and when the seal is worn from the side of the water cavity, water leaks. This is accompanied by the risk of emergency gas contamination of the premises and significant labor and money costs for the consumer for restoration and repair. In addition, the presence of friction in the seals negatively affects the accuracy of the regulation of the water supply.

This drawback was eliminated in the water-gas unit according to [US Pat. RU 2641999 Russian Federation, Water and gas unit / Petko V.G .; applicant and patentee FGBOU VPO "Orenburg State Agrarian University"; publ. 01/23/2018], in which the gas supply valve is driven by a membrane through the magnetic field of two magnets located on both sides of a non-magnetic partition separating the gas and water cavities of the unit.

However, in this water-gas unit, as in the previous one, the membrane is the receiving organ of the water flow. The fragility of the membrane reduces the operational reliability of the unit, and the interconnection of the systems for regulating the gas supply and limiting the water flow due to the counteraction of the movement of the membrane by two springs simultaneously complicates the adjustment of the unit and the accuracy of the systems.

The object of the proposed invention is to eliminate these disadvantages.

The technical result is achieved due to the fact that in a water-gas unit for a flow-through water heater, which has a water and gas compartments separated by a non-magnetic partition, a movable device located in the cavity of the water compartment, dividing it into a cavity of increased pressure and a cavity of reduced pressure associated with a valve for limiting the water supply and perceiving the water pressure difference created by the ejector, the injection and suction leads of which are connected, respectively, with the cavity of increased and reduced pressure, and a water flow rate regulator is installed at the suction outlet of the ejector, and the movable device is connected through the magnetic field of the first magnet installed on it with the located in the gas cavity with a second magnet oriented to it with the same name, mechanically acting on the gas supply valve spring-loaded towards the seat and acting on the position sensor of the gas supply valve, the movable device is made in the form of a piston associated with the first magnet with the possibility of axial movement through the spring installed between it and the magnet, and a reed switch located in the magnetic field of the second magnet is used as a position sensor.

The essence of the alleged invention is illustrated by figure 1.

A water-gas unit for a flow-through water heater has a water compartment 2 and a gas compartment separated by a non-magnetic partition 1, a water compartment 2 and a gas compartment 3. A movable device 4, made in the form of a piston, connected to a valve 5 for limiting the water supply is installed in the body of the water compartment 2. The movable device divides the cavity of the body of the water compartment 2 into a cavity of increased pressure 6 and a cavity of reduced pressure 7, connected to each other through the inlet 8 and suction 9 leads of the ejector 10. The inlet outlet of the ejector 10 is equipped with a regulator 11 of the water flow limiter. The movable device 4 is connected through the magnetic field of the first magnet 12 installed on it with the second magnet 13 located in the gas cavity, oriented to the first magnet 12 with the same pole. The second magnet 13 is mechanically connected to the gas supply valve 15 pressed against the seat by the spring 14, and through a magnetic field with a reed switch 16 acting as a valve position sensor 15. In this case, the first magnet 12 has the possibility of axial movement relative to the movable device 4 if the force acting on it will exceed the force of the resistance of the spring 17.

The water-gas unit works as follows.

In the initial state, the valve at the outlet of the coil (not shown in the drawing) is closed, water does not flow through the ejector 10, the pressure in the high-pressure cavity 6 and the reduced-pressure cavity 7 on both sides of the piston head 4 is the same. The magnet 12 under the action of the pre-stressed spring 17 occupies the extreme left position in the piston, and under the action of the spring 14 transmitted through the magnetic field of the first and second magnets 12 and 13, the piston 4 together with the magnet 12 is displaced in the cavity 7 to the extreme right position. In this case, the distance between the poles of the magnets is maximum, and the force of interaction is minimal. As a result, by the force of the spring 14, the gas supply valve 15 is completely closed, and the second magnet 13 is as close as possible to the non-magnetic partition 1.

As the valve opens at the outlet of the coil, the supply of water will begin to increase, flowing through, among other things, the setpoint 11. As a result of the loss of pressure due to the hydraulic resistance of the setpoint, the pressure in the reduced pressure cavity 7 compared to the pressure in the increased pressure cavity 6 will decrease. The movable device 4, made in the form of a piston, under the action of a pressure difference, overcoming the relatively small repulsive force of the magnets due to the increased distance between the poles of the magnets, will begin to move from right to left. The distance between the poles of the magnets will shorten, the repulsive force will increase.

As soon as the water supply reaches the minimum permissible value for a given heating device, the force of repulsion of the magnets from each other will be greater than the force with which the spring 14 presses the valve 15 against the seat. The second magnet 13 and the associated valve 15 will begin to move from right to left, slightly opening the gas access to the burner. The valve 15 will fully open when the magnet 12, with a further increase in the water flow, rests against the non-magnetic partition 1 of the water compartment 2 of the gas compartment 3. Moreover, the more open the dismountable valve at the coil outlet, the lower the water heating temperature with a fixed gas supply.

Excessive opening of the valve at the outlet of the coil or a jump in water pressure in the water supply network will not lead to a noticeable increase in water supply, since the piston, overcoming the resistance of the spring 17, will begin to close valve 5, thereby increasing the hydraulic resistance to the flow of water. Moreover, an increase in the hydraulic resistance of the valve will occur synchronously with a decrease in the hydraulic resistance of the valve at the outlet of the coil, which will lead to stabilization of the water supply. In this case, a change in the level of stabilization can be carried out by acting on the actuator of the setpoint 11, as a result of which its hydraulic resistance will change, and, consequently, the value of the water flow, at which the pressure difference between the cavities will be sufficient for the piston to overcome the resistance of the spring 17 and take effect valve 5 limiting the flow of water.

The operation of the water-gas unit occurs in the reverse order in the process of closing the valve at the outlet of the coil.

Thus, the proposed water-gas unit for a flow-through water heater, in comparison with the prototype, does not contain a membrane, which, as practice has shown, is the most frequent cause of failures of water-gas units during their operation. In addition, the systems for regulating the gas supply and limiting the water supply operate sequentially, independently of each other, which simplifies their setup and adjustment. All this as a whole increases the reliability of the unit and the accuracy of the operation of control systems, both gas supply and limitation of water supply, which is especially important in case of unstable pressure in the water supply network.

Claims (1)

A water-gas unit for a flow-through water heater, which has a water and gas compartments separated by a non-magnetic partition, a movable device located in the cavity of the water compartment, dividing it into a cavity of increased pressure and a cavity of reduced pressure, connected with a valve for limiting the water supply and receiving the water pressure difference created by the ejector, the pumping and suction leads of which are connected, respectively, with the cavity of increased and with the cavity of reduced pressure, and a water flow rate regulator is installed at the suction outlet of the ejector, and the movable device is connected through the magnetic field of the first magnet installed on it with the second magnet, located in the gas cavity, oriented to it with the same pole mechanically acting on the gas supply valve spring-loaded towards the seat and acting on the position sensor of the gas supply valve, characterized in that the movable device is made in the form of a piston connected to the first magnet with the possibility of axial displacement through a spring installed between it and the magnet, and a reed switch located in the zone of the magnetic field of the second magnet is used as a position sensor.

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