WO2006116924A1

WO2006116924A1 - An automatic water current controlling method of a water heater and a water heater

Info

Publication number: WO2006116924A1
Application number: PCT/CN2006/000828
Authority: WO
Inventors: Guanghai Mai
Original assignee: Guanghai Mai
Priority date: 2005-05-05
Filing date: 2006-04-27
Publication date: 2006-11-09

Abstract

An automatic water current controlling method of a water heater and a water heater with a simple structure are disclosed, which are convenient and safe for using and can prolong the life of the water tank of the water heater. The water heater comprises the water tank, a hot water pipe, a water outputting valve, a water overflowing pipe, a tap water pipe and a water supplying pipe. The water inlet of the water outputting valve is connected to a coupling pipe. A controlling valve is connected between the coupling pipe and the outlet of the hot water pipe. A water controlled expanding device is connected between the coupling pipe and the tap water pipe. A water supplying valve closed normally is connected between the coupling pipe and the water supplying pipe. A water overflowing valve opened normally is connected between the water tank and the water overflowing pipe. A water feeding valve is provided on the passage of the tap water pipe, the usual state of which is an ajar state. The water supplying valve, the water overflowing valve and the water feeding valve is controlled by the expanding wall of the water controlled expanding device. When the water outputting valve is opened, the water feeding valve is kept ajar at the instant when the expanding wall controls the water supplying valve and the water overflowing valve to switch.

Description

Water flow automatic control method and water heater

The invention relates to a water heater, in particular to an automatic water flow control method for a water heater and a water heater. Background technique

The water supply system of the closed storage water heater for the existing family or hotel room includes a water tank, a water supply cold water pipe, a safety valve, a water outlet hot water pipe and a water outlet valve, wherein the water supply cold water pipe connects the water tank with the water pipe and the water outlet hot water pipe Connect the water tank and the water outlet valve. The water tank contains hot water. The hot water is heated by the heating element (such as the electric heating tube, the electromagnetic field eddy current heating body, the principle of using the electromagnetic cooker, the microwave generator - the principle of using the 启波 wave furnace Heating water, heat pump heating system - reverse operation of refrigeration system from heat absorption in the air, solar collector) heating; in normal state, water pipe, water tank, water outlet hot water pipe, water outlet valve (or The mixing valve) constitutes an enclosed body, and the outlet hot water pipe can be connected with a plurality of outlet valves (or mixing valves) to achieve central water control; when used, the outlet valve (or mixing valve) is opened, and the hot water in the water tank The water pressure of the water tank is controlled by the water pressure in the water pipe. The national standard stipulates that the rated working pressure of the closed electric water heater tank is 0. 6MPa (for our country) The maximum static water pressure of the water, the operating pressure of the safety setting is generally 0. 7MPa, but when the water heater is heated, the internal pressure of the water tank increases due to the increase of the water temperature until the safety valve opens to relieve the pressure, so the water tank of the closed water heater In fact, the long-term work is at a high pressure of 0.7 MPa; therefore, the closed-type water heater can realize long-distance central water control, but because the water tank is subjected to high temperature and high pressure for a long time, the water tank material is thick and expensive, and the metal water tank is high. It is easily rusted under the action of high temperature and high pressure, thereby shortening its life. Therefore, the disadvantage of the existing water heater is that the life of the water tank is short. However, existing open water heaters have low cost and long life, but cannot achieve central water supply. Summary of the invention

The object of the present invention is to solve the problems of high cost, short life, low reliability in the existing closed water storage water heater or the problem that the central water supply cannot be realized in the existing open water heater, and provide a structure. Water flow automatic control method and water heater for water heaters that are simple, easy to use, and long in life.

The object of the present invention is achieved by the following: A water flow automatic control method for a water heater, comprising a water tank, a hot water pipe, a water outlet valve, a water pipe and a water supply pipe, wherein the water supply pipe supplies cold water to the water tank, and the hot water pipe is taken out from the water tank. Hot water, which is characterized by:

Confirmation a. The water inlet of the water outlet valve is connected with a connecting pipe, and a control valve for preventing the water in the connecting pipe from flowing to the hot water pipe is connected between the connecting pipe and the hot water pipe outlet, and a water control expansion device is connected between the connecting pipe and the water pipe, and the connecting pipe a normally closed water supply valve is connected between the water supply pipe or the inner cavity of the water control expansion device and the water supply pipe;

b. A normally open overflow valve is connected between the water tank and the overflow pipe, and the highest point of the overflow passage formed between the overflow valve and the overflow pipe is close to or higher than the highest point of the water tank;

c. The inlet pipe is provided with a water inlet valve on the passage of the water control expansion device, and the state of the water inlet valve is divided into an open state and a slightly open state;

d. The water supply valve, the overflow valve and the inlet valve are controlled by the expansion wall of the water-controlled expansion device;

e. The control threshold door is controlled by the water pressure or controlled by the control rod of the water outlet valve or controlled by the expansion wall of the water control expansion device, and the expansion wall control of the water control expansion device controls the action of the valve switching, The inlet valve is in a slightly open state;

f. When the water outlet valve is opened, the water control expansion device contracts, and the operation sequence of controlling the water supply valve, the overflow valve and the water inlet valve when the expansion wall of the water control expansion device moves inward is: first closing the overflow valve and The water supply valve is opened, and finally the inlet valve is opened; when the water outlet valve is closed, the water control expansion device is expanded, and the operation sequence of controlling the water supply valve, the overflow valve and the inlet valve when the expansion wall of the water control expansion device moves outward is: First, let the inlet valve enter the micro-opening state, then close the water supply valve and open the overflow valve.

The water flow automatic control method of the water heater is characterized in that a normally closed water supply gate is connected between the inner cavity of the water control expansion device and the water supply pipe, and the water control expansion device and the connection pipe are provided with normally open water control a valve, the water control valve being controlled by an expansion wall of the expansion device; when the water discharge valve is opened, the water control expansion device is contracted, and the water supply valve and the overflow valve are controlled when the expansion wall of the water control expansion device moves inward The operation sequence of the water control valve and the water inlet valve is as follows: first close the overflow valve and open the water supply valve, close the water control valve, and finally make the inlet valve enter the open state; when the outlet valve is closed, the water control expansion device expands, the water control expands When the expansion wall of the device moves outward, the operation sequence of controlling the water supply valve, the overflow valve, the water control valve and the water inlet valve is as follows: first, the inlet valve is opened to the micro-open state, the water supply valve is closed, the overflow valve is opened, and the water control is finally opened. valve. At this time, the water control valve can only be disposed between the inner cavity of the water control expansion device and the water supply pipe, and cannot be disposed between the connection pipe and the water supply pipe. The advantage is that the water outlet valve can be opened to make the water heater in a normal water discharge state, and the water can be ensured. The valve only has hot water entering from the hot water pipe, and there is no cold water in the pipe to enter the outlet valve.

The water flow automatic control method of the water heater is characterized in that the water control expansion device is composed of a valve body and a piston, and a pressure spring is arranged between the piston and the valve body to cause the piston to receive an inward pressure, the piston and the piston A sealing ring is disposed between the valve body chambers, and the piston is the expansion wall. The seal has a "U" shape and opens into the body cavity of the valve.

The water flow automatic control method of the water heater is characterized in that the overflow valve or the water supply valve or the control valve is an electric control valve, and the electric control valve is controlled by an electric switch, and the action of the electric switch is controlled by the expansion wall of the water control expansion device And the expansion wall of the water control expansion device controls the moment when the electrical switch action is switched, and the water inlet valve is in a slightly open state. The overflow valve and the water supply valve and control valve can also be integrated in the same electronically controlled valve.

The water flow automatic control method of the water heater is characterized in that a water blocking block is arranged in the water control expansion device, and the water inlet block of the water blocking block and the 7-controlled expansion device constitutes the water inlet valve, and the water blocking block moves to block the water When the water inlet of the expansion device is controlled, the gap between the water blocking block and the ice inlet of the water control expansion device constitutes four open states of the water inlet valve.

The water heater using the water flow automatic control method of the water heater of the invention comprises a water tank, a heating element, a hot water pipe, a water outlet valve, a water pipe and a water supply pipe, wherein the water supply pipe supplies cold water to the water tank, and the hot water pipe extracts hot water from the water tank The heating element may be an electric heating tube, a electromagnetic field eddy current heating body, a microwave generator, a heat pump type heating system, and a solar collector, wherein the water inlet valve of the outlet valve is connected with a connecting pipe, the connecting pipe and the hot water pipe outlet. Indirectly, there is a control valve for preventing the water in the connecting pipe from flowing to the hot water pipe, and a water-controlled expansion device is connected between the connecting pipe and the water pipe, and the connection between the connecting pipe and the water supply pipe or between the inner cavity of the water-controlled expansion device and the water supply pipe is infrequent Closed water supply valve; a normally open overflow valve is connected between the water tank and the overflow pipe. The highest point of the overflow passage formed by the overflow valve and the overflow pipe is close to or higher than the highest point of the water tank (for ease of installation, the overflow valve can be connected to the water supply pipe) Between the overflow pipe and the overflow channel formed between the water supply pipe, the overflow valve and the overflow pipe, the highest point is close to or higher than the water. The highest point); an inlet valve is provided on the passage of the water pipe to the water-controlled expansion device, and the opening of the inlet valve is divided into an open state section and a micro-open state section; the water supply valve, the overflow valve and the inlet valve are subjected to The expanded wall of the water-controlled expansion device is controlled, and at the moment when the operation of the water supply valve and the overflow valve is switched, the inlet valve is in a slightly open state. In the normal state, the inlet valve is in the micro-open state or closed state. If the inlet valve is in the micro-open state during normal state, the pressure-resistant value of the water-controlled expansion device must be greater than the maximum pressure of the tap water, and the inlet valve is open. The inlet flow rate of the section is larger than the micro-opening state section, and the restoring force of the expansion wall can be regarded as a constant value. When the pressure in the water-controlled expansion device increases, the expansion wall controls the opening of the inlet valve to decrease, and vice versa. The opening of the valve is increased, so that when the inlet valve enters the open state, the water pressure in the water-controlled expansion device is constant within a certain pressure range. Of course, because the connecting pipe is in communication with the water-controlled expansion device, the water supply valve can also be connected between the water supply pipe and the inner cavity of the water-controlled expansion device.

The water heater, characterized in that the inlet valve is composed of a valve seat, a stator and a moving piece, and a fixed piece A water leakage joint is arranged on one side of the through hole, and the water inlet groove on the moving piece passes through the through hole of the fixed piece and enters the water leakage joint, which is the micro open state section, and the leakage joint has a section smaller than the section of the through hole of the fixed piece.

The water heater is characterized in that the control valve is a one-way valve. The action of the check valve is controlled by water pressure.

The water heater is characterized in that the control valve is a normally closed shut-off valve, and the shut-off valve is controlled by the expansion wall of the water-controlled expansion device, and the inlet valve is in a slightly open state at the moment of switching the action of the shut-off valve. segment. Of course, the shut-off valve can also be integrated in the above-mentioned switching valve.

The water heater is characterized in that the water valve is a mixed water, the connecting pipe is connected to the cold water inlet of the mixing valve, the outlet of the hot water pipe is connected to the hot water inlet of the mixing valve, and the water mixing valve is The hot water valve is the control valve. In fact, the existing mixing valve integrates the control valve with the ice-out valve, and the movement of the hot water valve is controlled by the control rod of the mixing valve.

The water heater is characterized in that the water supply valve and the overflow valve return to a normal state by a return spring. 7 The expansion wall of the control expansion device and the return spring jointly control the water supply valve and the overflow valve.

The water heater is characterized in that the water-controlled expansion device is composed of a valve body and a piston, and a pressure spring is arranged between the piston and the valve body to press the piston inward pressure, and a sealing ring is arranged between the piston and the valve body cavity. The piston is the expansion wall. The seal has a cross section and opens into the valve body cavity.

The water heater is characterized in that a limit block that defines the outermost displacement of the expansion wall is disposed on the water control expansion device. When the inlet valve is in the normal state, it is in the micro-open state. The function of the limiting block is to make the water-controlled expansion device have sufficient withstand voltage (greater than the maximum water pressure of the tap water).

The water heater is characterized in that a water blocking block is arranged in the water-controlled expansion device, and a water blocking block of the water blocking block and the water-controlled expansion device constitutes the water inlet valve, and the water blocking block moves to block the water-controlled expansion device. At the nozzle, the gap between the water blocking block and the water inlet of the water-controlled expansion device constitutes a slightly open state section of the inlet valve.

When hot water is used, the outlet valve is opened, the pressure in the water-controlled expansion device drops, the water-controlled expansion device contracts, and the expansion wall moves inward under the action of the resetting force. When the expansion wall draws the inlet valve to be in the micro-open state The movement of the expansion wall causes the overflow valve and the water supply valve to operate, that is, the overflow valve is closed, the water supply valve is opened (if the control valve is a shut-off valve, the shut-off valve is simultaneously opened), and then the inlet valve enters an open state to balance the water-controlled expansion The ice pressure of the device and the water heater refrigerator, the water heater enters the use state, the water in the water pipe passes through the water control expansion device, the connecting pipe, the water supply valve, the water supply pipe into the water tank, so that the hot water in the water tank flows through the hot water pipe and the control valve After meeting with the cold water from the connecting pipe, it flows out through the water outlet valve; when the hot water is used, the water outlet valve is closed, and the water pressure in the controlled expansion device is increased to cause the expansion wall to move outward, and the inlet valve enters the micro-open state from the open state. , water supply valve, overflow valve (control Valve) reset, that is, the water supply valve is closed, the overflow valve is opened (control gate is closed), and then, if the inlet valve is a shut-off valve, then the inlet valve enters the closed state from the micro-open state, if the inlet valve is not a cut-off Valve, the expansion wall is limited to the block position, and the inlet valve is maintained in a slightly open state. At this time, the water pressure in the water-controlled expansion device is the same as the water pressure in the water pipe, but the water in the water-controlled expansion device cannot be It communicates with the water tank, but is maintained by the resetting force of the water-controlled expansion device to maintain a certain internal pressure. The water heater enters the standby state—normally, the space inside the water tank communicates with the overflow pipe through the overflow valve, so that the water tank is open to the atmosphere. State. The micro-opening section of the inlet valve is mainly used to ensure that the expansion wall has sufficient displacement to control the action of the overflow valve, the water supply valve and the control valve.

To achieve the central water supply, if the outlet valve is a faucet, you only need to connect several faucets to the connection. If the sputum outlet valve is a mixing valve, you can directly connect multiple external mixing valves.

The water heater is characterized in that the connecting pipe is further connected with a normally closed drain valve, and the drain valve is controlled by the expansion wall of the water control expansion device. If the water heater is unable to open the overflow valve due to the water supply valve or the like being stuck in the standby state, the internal pressure of the water control expansion device continues to increase, and the expansion wall controls the discharge valve to open and discharge the water to protect The water tank is an auxiliary structure.

The water heater is characterized in that the drain valve is a quick opening delay closing valve. If the water supply valve fails to open the overflow valve during the process from the use state to the standby state, the internal pressure of the water control expansion device continues to increase, and the expansion wall controls the drain valve to open for a period of time, so that the water heater automatically enters a short-time use state. The water supply valve and the inlet valve are reopened to wash away the impurities.

Beneficial effects:

Due to the technical solution of the present invention, when the water outlet valve is closed, the water tank is open to the atmosphere and the water pipe is not connected, and only when the water is discharged, the water tank is connected with the water pipe, and the water tank only bears much less than 0. The dynamic water pressure of 7Mpa, and this dynamic water pressure can also be decompressed and constant pressure. Even when the water outlet valve is closed, the water pressure of the water pipe will not be transmitted to the water tank. Therefore, the water tank is operated by the original long-term pressure. The system becomes a short-time pressure working system, and the pressure value is low: the pressure standard of the water tank can be lowered, thereby reducing the wall thickness of the water tank and saving cost and resources. The water tank does not need to work in a high pressure state for a long time, is not easily rusted, and extends the water tank. The service life of the water heater is improved. Although the water heater is in an open state when no water is discharged, the central water supply can also be realized. Therefore, it is not only long-life, safe, but also easy to use and structurally simple.

DRAWINGS

The invention will now be further described with reference to the accompanying drawings and embodiments.

1 is a schematic view showing a connection structure and a control principle of an embodiment of the present invention.

Figure 2 is an enlarged schematic view showing the internal structure of the water-controlled expansion device of the embodiment of Figure 1. Figure 3 is a schematic view showing the state of the water-controlled expansion device of Figure 2 when the water heater is in use. Fig. 4 is an enlarged plan view showing the inner stator of the switching valve 4 of Fig. 2;

Fig. 5 is an enlarged view showing the appearance of the movable piece of the switching valve 4 of Fig. 2.

FIG. 6 is a schematic diagram of a connection structure and a control principle according to another embodiment of the present invention.

FIG. 7 is a schematic diagram of a connection structure and a control principle according to still another embodiment of the present invention.

FIG. 8 is a schematic diagram of a connection structure and a control principle according to still another embodiment of the present invention.

Figure 9 is an enlarged schematic view showing the internal structure of the water-controlled expansion device in the embodiment.

Fig. 10 is an enlarged perspective view showing the stator of the switching valve 04 of Fig. 9.

Figure 11 is an enlarged view of the appearance of the rotor of the switching valve 04 of Figure 9. '

FIG. 12 is a schematic diagram of a connection structure and a control principle according to still another embodiment of the present invention.

Figure 13 is an enlarged schematic view showing the internal structure of the water-controlled expansion device of Figure 12;

Figure 14 is an enlarged plan view showing another structure of the switching valve inner stator of Figure 13;

Fig. 15 is a view showing the dotted line 400, 500 of the water inlet and the water supply tank of Fig. 14 rotated by an angle.

Marked in the figure: 91, 091, 0091, water tank, 911, 0911, 00911, hot water pipe, 921, 0921, 00921, water outlet, 92, 092, 0092, mixing valve, 901, 0901, 00901, connecting pipe , 84, 0084, drain valve, 811, 00811, water pipe, 81, inlet valve, 90, water-controlled expansion device, 83, 083, 0083, overflow valve, 831, 0831, 00831, overflow pipe, 821, 0821 , 00821, water supply pipe, 82, 082, 0082, water supply valve; 701, one-way damping valve, 7, damper seat, 72, power spring, 71, damper rod, 711, notch, 63, spring seat, 62, spring, 33, ejector, 2, 02, bracket, 34, 034, pressure spring, 3, 03, piston, 1, 01, valve body, 32, 032, front, 10, 010, expansion chamber, 11, 011, water Hole, 13, 013, interface, 12, 012, water inlet, 5, 05, water blocking block, 51, 051, return spring, 14, 014, guide limit block, 41, 041, switching lever, 4, 04 , switching valve, 311, 0311, indenter, 65, branch pipe, 312 0312, sliding surface, 31, 031, control lever, 61, switch lever, 64, drain pipe; 48, fixed piece, 482, 481, 483, 484, 485, through hole; 49, moving piece, 491, water supply sink, 492, inlet tank; 910, check valve, 920, outlet valve, 9011, connection, 9100, shut-off valve, 99, hot water pipe, 099, pipe, 009, junction; 4850, through hole, 4851, leaking seam 80, water-controlled expansion device, 800, water pipe, 020, limit block, 400, 500, dashed line, 4810, 4820, 4830, 4840, through hole; 148, fixed piece, 1481, 1482, 1483, through hole, 149, moving film, 1491 water supply tank, 990, water-controlled expansion device, 881, inlet valve. detailed description: Embodiment 1, as shown in FIG. 1, a water heater using the water flow automatic control method of the water heater according to the present invention, comprising a water tank 91, a heating element (not shown), a hot water pipe 911, a water mixing valve 92, and an overflow pipe 831, the water pipe 811 and the water supply pipe 821, the hot water inlet of the water mixing valve 92 is connected to the hot water pipe 911, the cold water inlet connecting pipe 901, and the heat between the hot water pipe 911 and the water outlet pipe 921 is set by the mixing valve 92. The water valve is used as a control valve, and the water control expansion device 90 and the water inlet valve 81 are connected between the connection pipe 901 and the water pipe 811, and the normally closed water supply valve 82 is connected between the connection pipe 901 and the water supply pipe 821; the water supply pipe 821 and the overflow water pipe 831 An indirect normally open overflow valve 83; 7 a dotted line between the controlled expansion device 90 and the overflow valve 83, the water supply valve 82, the drain valve 84, and the inlet valve 81, used to indicate the overflow valve 83, the water supply valve 82, and the drain valve The water valve 84 and the switch lever of the water inlet valve 81 are connected to the expansion wall of the water control expansion device (the same applies to the following embodiments); in fact, the overflow valve 83, the water supply valve 82 and the water inlet valve 81 are integrated in one switch. Inside the valve (see Figure 2, Figure 4 and Figure 5 and below) Figure 1 is a schematic diagram for the sake of easy understanding. It is a schematic diagram. The internal structure of the water-controlled expansion device 90 is shown in Figure 2. The valve body 1, the pressure spring 34 and the long wall as the 'expansion J' The piston 3 is configured to form an expansion chamber 10 between the valve body cavity and the piston, the water outlet hole 1 1 of the valve body is connected to the tube 901, and the normally closed inlet valve 81 is connected between the interface 13 and the water pipe 811 (Fig. 1). The expansion chamber 10 is connected to the ice release valve 84 through the branch pipe 65, and the switch rod 61 of the drain valve extends into the notch 71 1 of the damping rod 71 of the damping device; the water blocking block 5, the water inlet hole 12 and the return spring 51 constitute a forward The water valve (hereinafter defined as "inlet valve A") is disposed on the passage of the inlet valve 81 to the water-controlled expansion device 91 (ie, the inlet valve 81 in FIG. 1 is connected in series to the water pipe 811 and the inlet valve A). between).

The water supply valve 82, the overflow valve S3 and the water inlet valve 81 in Fig. 1 are integrated in the switching valve 4 of Fig. 2, and the switching valve 4 is provided with a return spring (not shown) to return it to the position shown in Fig. 2. The through hole 481 in the fixed piece 48 of the switching valve shown in FIG. 4 is connected to the water supply pipe 821 and the through hole 482 in FIG. 1 , and the overflow pipe 831 and the through hole 483 in FIG. 1 are connected to the connecting pipe 901 in FIG. 1 . The through hole 484 is connected to the expansion chamber 10 through the inlet hole 13 through the interface 13 in FIG. 1, and the through hole 485 is connected to the water pipe 811 in FIG. 1. The rotor 49 of the switching valve in FIG. 5 faces the stator 48. The side is provided with a water inlet 492 and a water supply tank 91. The water inlet 492 in the rotor and the through holes 484 and 485 in the stator constitute the water inlet valve 81, the water supply tank 491 and the through hole 481 in the stator. 'and 482 constituting the overflow valve 83 in Fig. 1, the water supply tank 91 and the through hole 481 and the through hole 483 in the stator constitute the water supply valve 82 in Fig. 1; in this embodiment, the water inlet 492 and the stator of the rotor The inlet valve 81 of Fig. 1 formed by the through holes 484 and 485 has only an open state section and a closed state, and has no micro-open state section.

When hot water is used, the mixing valve 92 in Fig. 1 is opened, and the water in the expansion chamber 10 in Fig. 2 passes through the water outlet hole 11, the connecting pipe 901 in Fig. 1, and the mixing valve under the action of the pressure spring 34 and the piston 3. The cold water inlet of the 92 and the outlet pipe 921 flow out, and at the same time, the control rod 31 (Fig. 2) connected to the piston moves down, the indenter 311 overcomes the force of the return spring on the switching lever 41 of the switching valve 4 to switch the switching valve to another working state (in conjunction with FIGS. 4 and 5, the clockwise rotation with respect to the rotor 49 in FIG. 492 is spanned between the through holes 484 and 485 - that is, the inlet valve 81 is opened, and the water supply tank 491 is again spanned between the through holes 481 and 483 - that is, the overflow valve 83 is closed and the water supply valve 82 is opened), the switching lever 41 The roller at the end is pressed on the sliding surface 312 of the control rod (shown in FIG. 3). At this time, since the water blocking block 5 is located at the water inlet hole 12, the water inlet pipe 811 and the water inlet valve 81 enter the water inlet hole 12. The water can only enter the expansion chamber 10 through a small gap between the water blocking block 5 and the water inlet hole 12, and the flow rate thereof is small (less than the water discharge amount of the mixing valve 92 at this time, that is, the water blocking block in this embodiment) The relationship between 5 and the inlet hole 12 realizes the micro-open state of the inlet valve), and the inlet valve A (i.e., the inlet valve composed of the water blocking block 5, the inlet hole 12 and the return spring 51) is still in the micro In the open state section, the water-controlled expansion device continues to contract, and the piston 3 continues to move downward under the action of the pressure spring 34 until the front portion 32 of the control lever will The water block 5 is pushed downward, the opening between the water blocking block 5 and the water inlet hole 12 is increased, and the water inlet valve A (i.e., the water inlet valve composed of the water blocking block 5, the water inlet hole 12 and the return spring 51) enters. When the state is open, the water-controlled expansion device enters a state of decompression and constant pressure. As shown in Fig. 3, the water heater enters the use state, and the tap water in the water pipe 811 passes through the water inlet valve 81 (the through hole 485 in the fixed piece of Fig. 4, Fig. 5 The water inlet 492 in the sheet, the through hole 484 in the fixed piece of FIG. 4, the interface 13, the water inlet hole 12, the expansion chamber 10, and the water outlet hole 11 are separated into two tubes, and the two paths are mixed. The cold water inlet of the water valve 92 enters the cold water branch in the mixing valve, and the other is the water supply valve 82 (the through hole 483 of the fixed piece in Fig. 4, the water supply groove 491 of the moving piece in Fig. 5, and the fixed piece in Fig. 4) The hot water inlet of the through hole 481), the water supply pipe 821, the water tank 91, the hot water pipe 911, and the mixing valve 92 enters the hot water branch in the mixing valve 92, and the cold and hot water branch are mixed in the mixing valve. After entering the warm water, the water flows out through the water outlet pipe 921; when the hot water is used, the water mixing valve 92 is closed, and the water pressure in the expansion chamber 10 rises to move the piston 3 upward, and the control is performed. The front portion 32 is separated from the water blocking block 5, and the water blocking block 5 re-blocks the water inlet hole 12 under the action of the return spring 51. The water in the water inlet hole passes through a small gap between the water blocking block and the water inlet hole. The water supply in the expansion chamber 10, the inlet valve A returns to the micro-open state, so that the piston 3 can continue to move upward, and the roller at the front end of the switching rod 41 slides off the sliding surface 312 on the control rod and is normally reset to the return spring. 2, in conjunction with FIG. 4 and FIG. 5, only the water supply groove 491 on the moving piece spans between the through holes 481 and 482 to connect the water supply pipe 821 with the overflow pipe 831 (ie, the overflow valve S3 is opened), the through hole 483 is not connected to the through hole 81 (the water supply valve S2 is closed;), the through hole 484 and the through hole 4S5 are blocked (the inlet valve 81 is closed), of course, the order is to close the water supply valve 82, open the overflow valve Π 83, and then close the inlet valve. 81; However, when the switching valve 4 is reset, if impurities are caught between the through hole 483 of the stator and the water supply groove 491 of the moving piece, the switching rod 41 cannot be reset, and the overflow pipe and the water supply pipe are not connected to each other. The water tank 492 also spans between the through holes 484 and 485 (ie, the water inlet valve 81 is still open State), the water pressure in the expansion chamber 10 continues to increase, and the piston 3 continues to move upward on the basis of FIG. 2 until the piston 3 The connected ram 33 pushes the damper rod 71 upward to the stable threshold line formed by the switch lever 61 over the switch lever 61 and the stabilizer spring 62. After the stabilizer spring pushes the switch lever 61 to the state where the drain valve 84 is opened, the expansion chamber is opened. The water flows out through the drain valve 84 and the drain pipe 64, and the piston 3 moves downward. At this time, although the damper rod has the reactivation of the power spring 72, the damper rod acts due to the action of the one-way damper valve 701 on the damper seat 7. 71 can only slow down 1man to move down and can not immediately reset the switch lever 61, that is, the drain valve 84 can be turned off after a certain period of time, during this delay time, the piston re-controls the switching valve to enter the working state, The impurities stuck between the through hole 483 and the water supply tank 491 are washed away. In this embodiment, when the water blocking block 5 returns from the state of FIG. 3 to the state of FIG. 2, if impurities are caught between the water inlet hole 12 and the water blocking block 5, the function of the water control expansion device is not affected, so The structure also has an effect of preventing impurities. The central water supply can be realized by connecting the cold and hot water ports of the plurality of ice mixing valves to the pipe 901 and the hot water pipe 911, respectively. In the present embodiment, the drain valve 84 and the inlet water tank 81 are omitted (not the water inlet valve is omitted), and the object of the present invention can be achieved at the same time, except that the 7J controlled expansion device 90 must have sufficient withstand voltage.

In the first embodiment, if the ordinary mixing valve is changed to the electric mixing valve, and the one-way valve flowing in the direction of the electric mixing valve is added to the passage of the hot water pipe 911, a plurality of connecting pipes 921 may be connected. The outlet valve provides central water supply.

The second embodiment, FIG. 6 is a schematic diagram of the connection structure and the control principle of the embodiment. The second embodiment differs from the first embodiment only in that the water mixing valve in the first embodiment is changed to the faucet type water outlet valve 920. The one-way valve 910 is used as a control valve between the outlet valve 920 and the hot water pipe 99, and the connection 9011 between the connection pipe and the outlet valve is changed to a smaller pipe diameter, and the rest is the same as that of FIG. The 7j air expansion device of the structure shown in Fig. 2, the stator and the rotor structure in the switching valve also adopt the structure of Fig. 4 and Fig. 5 respectively, where the connection pipe 9011 adopts a smaller pipe diameter because the water outlet valve is prevented. After the 920 is opened, the water in the connecting pipe is completely discharged through the water outlet valve, and the hot water in the water tank cannot be ejected. The working principle is similar to that of the first embodiment. Of course, if an electric temperature mixing valve is added at the joint 9011 and the tube 099 to control the outlet temperature of the faucet, the joint 9011 can adopt a tube having a larger diameter. Central water supply can be achieved by connecting multiple external taps at tube 099.

Embodiment 3, see FIG. 7, the third embodiment differs from the second embodiment only in that the one-way valve of FIG. 6 is changed to the normally closed shut-off valve 9100 of FIG. 7 as a control valve, and the shut-off valve 9100 is controlled by a water-controlled expansion device. The expansion wall control inside, in the same way, the shut-off valve 9100 can also be integrated in the switching valve together with the overflow valve, the water supply valve and the like. The working principle is similar to the above embodiment, and will not be described here.

Embodiment 4, FIG. 8 is a schematic diagram of a connection structure and a control principle, and a water-controlled expansion device diagram of FIG. 9. This embodiment is modified from the embodiment of FIG. 1, and the water inlet valve 81 of FIG. 1 is omitted. The drain valve 84 and the time delay damping mechanism of FIG. A limit block is arranged in the water-controlled expansion device, and the position of the limit block is shown in FIG. 9. The support block 02 on the upper part of the valve body 01 protrudes from the limit block 020 to define the piston 03. The highest position, the water inlet hole 012, the water blocking block 05 and the return spring 051 in the valve body 01 in Fig. 9 constitute the inlet valve (defined as "inlet valve B"), and the state of the inlet valve B is divided into Open the status segment and the micro-open status segment.

The water-controlled expansion device in Fig. 9 is in a standby state, the interface 013 is connected to the water pipe 800 in Fig. 8, the overflow valve Q8 3 and the water supply valve 082 in Fig. 8 are integrated in the switching valve 04 of Fig. 9, and the switching valve 04 is fixed. The sheet 148 is as shown in FIG. 10 (actually, the through holes 484 and 485 in FIG. 4 are deleted), and the movable piece 149 is as shown in FIG. 11 (actually, the water inlet 492 in FIG. 5 can be deleted. The through hole 1481 in the stator 148 of the switching valve 0 is connected to the water supply pipe 0821 and the through hole 1482 in FIG. 8 and connected to the overflow pipe 0831 and the through hole 1482 in FIG. 8 to the connecting pipe 0901 in FIG. The movable piece 149 is provided with a water supply groove 1491 on the side of the fixed piece 148. The water supply groove 1491 in the movable piece and the through holes 1481 and 1482 in the fixed piece constitute an overflow valve, a water supply groove 1491 and a through hole 1481 and a through hole in the fixed piece. 1483 constitutes a water supply valve.

Working principle: With reference to Fig. 8, Fig. 9, Fig. 10 and Fig. 11, open the water mixing valve 092, the water in the expansion chamber 010 flows out through the water outlet hole 01 1 , the connecting pipe 0901, the mixing valve 092, and the expansion chamber 01 0 The water pressure drops, the piston 03 moves downward by the pressure spring 034, the pressure head 0311 of the control rod 031 presses the switching 041 of the switching valve 04, the switching valve 04 switches, and the moving piece 149 is aligned with respect to the fixed piece 148. When the hour hand rotates, the water supply tank 1491 is switched from the state of the communication through holes 1481 and 1482 (the overflow valve 083 is opened, the water supply valve 082 is closed) to the state of the communication through holes 1481 and 1481 (the overflow valve 083 is closed, the water supply valve 082 is opened), Since the water blocking block 05 is also blocked at the outlet of the water inlet hole 012, the tap water can only enter the expansion chamber 010 through the gap between the water blocking block 05 and the water inlet hole 012, that is, by the water blocking block 05, the return spring 051 and the inlet. The water inlet valve (inlet valve B) formed by the water hole 012 is still in a slightly open state, so the piston 03 can continue to move down until the front portion 032 of the control lever pushes the water blocking block 05 downward to make the water blocking block 05 and the water inlet. The hole 012 is separated, and is composed of a water blocking block 05, a return spring 051 and a water inlet hole 012. The inlet valve enters the open state and stabilizes the water pressure in the expansion chamber 01 0. The water heater enters the use state, enters the expansion chamber 010 through the water inlet hole 012, and the water in the connection pipe 0901 directly enters the mixing valve 092. The cold water inlet, the other through the water supply valve C82 (ie, the through hole 1483 on the fixed piece 148, the water supply groove 1491 on the moving piece 149, the through hole 1481 on the fixed piece), the water supply pipe 0821 into the water tank 091, the hot water in the water tank 091 The hot water inlet which is pressed into the mixing valve 092 through the hot water pipe 0911 is mixed with the cold water from the cold water inlet of the mixing valve, and then becomes warm water and flows out through the outlet pipe 0921; after the hot water is used, the mixing valve 092 is closed, and the water is expanded. The internal pressure of the cavity 01 0 rises, the piston 03 moves up under the action of water pressure, the front part 032 of the control rod is separated from the water blocking block 05, the water blocking block 05 completely blocks the water inlet hole 012, and the tap water continues to pass through the water blocking block 05 and The gap between the water inlet holes 011 enters the expansion chamber 01 0, but the flow rate at this time is small, that is, the water inlet valve composed of the water blocking block 05, the return spring 051 and the water inlet hole 012 enters the micro-open state, the piston 03 Can continue to move up under the action of water pressure, switch rod 0 41 in the return spring (in the picture Not shown) reset, the water supply valve 082 is closed, the overflow valve 083 is opened (ie, the water supply tank 1491 in FIG. 11 spans between the through holes 1481 and 1482), and the piston 03 is moved up to the limit of the limit block 020. Up to this (state shown in Fig. 9), the water heater re-enters the standby state. At this time, although there is a gap between the water blocking block 05 and the water inlet hole 012, since the piston 03 is limited by the limiting block 02 0, the expansion chamber The water in 01 0 will not increase, and the water heater will enter standby mode. The central water supply can be realized by connecting the cold and hot water inlets of the multiple mixing valves to the pipe 0901 and the hot water pipe Q911 respectively. In the present embodiment, in order to prevent the water supply tank 1491 in FIG. 11 from being switched from the communication through holes 1481 and 1482 to the communication through holes 1481 and 1483, impurities may be trapped between the through hole 1482 and the water supply groove 1491, and the through hole may be changed. The relative position between 1481, 1482 and 1483 increases the transition process of the water supply tank 1491. The transition section is: a half-span through hole 1482, a full-span through hole 1481, a half-span through hole 148 3 , if If there is no impurity jam, the water supply tank 1491 can be quickly swept from the through holes 1481 and 1482 to the through holes 1481 and 1481 by the piston, and a small part of the water flows out through the overflow pipe; if there is an impurity stuck in the through hole 1482 and the water supply tank 1491, the water entering through the water blocking block 05 and the water inlet hole 012 in Fig. 9 can flow out through the overflow valve and the overflow pipe, thereby ensuring that the water tank is not affected by the tap water pressure.

Embodiment 5 FIG. 12 is a schematic diagram of a connection structure and a control principle of the present embodiment. The difference from the first embodiment is that the water blocking block 5 and the return spring 51 in the water-controlled expansion device of FIG. 2 are removed (see FIG. The mark in the figure is the same as that in Fig. 1. At the same time, the structure of the widening of the 7j air expansion device is the structure shown in Fig. 14, and the structure of the moving piece is the same as that of Fig. 5. That is, relating to the fifth embodiment are Figs. 12, 13, 3, 14, and 5.

The inlet valve 881, the overflow valve 83, and the water supply valve 82 in Fig. 12 are integrated in the switching valve 4 in Fig. 13.

As shown in FIG. 14, the through hole 4810 in the fixed piece of the switching valve is connected to the water supply pipe 821 and the through hole 4820 in FIG. 12, and the overflow pipe 831 and the through hole 48 30 in FIG. 12 are connected to the connecting pipe 901 in FIG. The hole 4840 is connected to the expansion chamber 10 through the interface 13 in FIG. 13, and the through hole 4850 is connected to the water pipe 811 in FIG. 12, and the two sets of dashed lines 400 and 500 respectively represent the water heater shown in FIG. 5 when the water heater is in the standby state. The position of the water inlet tank 492 and the water supply tank 491 with respect to the through holes on the fixed piece; the water supply groove 491 in the moving piece of Fig. 5 and the through holes 481 0 and 4820 in the fixed piece of Fig. 14 constitute the overflow valve 83, in the moving piece of Fig. 5 The water supply tank 491 and the through hole 4810 and the through hole 4830 in the fixed piece of Fig. 14 constitute the water supply valve 82, the water inlet 492 in the moving piece of Fig. 5 and the through holes 4840 and 4850 in the fixed piece of Fig. 14 constitute the water inlet valve 881; In Fig. 14, the left side of the through hole 4850 in the fixed piece is provided with a water leakage slit 851, so that the water inlet valve 492 in the moving piece of Fig. 5 and the water inlet valve 881 formed in the through hole 4840 and 4850 in the fixed piece of Fig. 14 have an open state section. , micro open state segment and closed state three states.

Figure 14 shows the relative position of the fixed piece and the moving piece of the switching valve 4 in Figure 13 in the standby state. In Fig. 14, the dotted line 400 representing the water inlet 492 of Fig. 5 just passes over the water leakage joint 4851, the through holes 4840 and 4850 are not in communication, the inlet valve 881 is completely closed, and the dotted line 500 representing the water supply tank 491 of Fig. 5 is crossed. Between the holes 4810 and 4820, the overflow valve 83 is opened, and the water supply valve 82 is closed. At this time, if the water mixing valve 92 in Fig. 12 is opened, the piston 3 in Fig. 13 drives the switching valve to operate, and the water inlet and the water supply tank on the moving piece are smoothly When the hour hand rotates to the state shown in Fig. 15, the water in the through hole 4850 of the water pipe can only enter the water inlet through the narrow leaking joint 4851 (dashed line 400 in Fig. 15), and the water supply groove (the dotted line in Fig. 15) 500) has been spanned between the through holes 4810 and 4830, which is equivalent to the overflow valve closing, the water supply valve 82 is open, that is, the operation of the overflow valve and the water supply valve is switched, and the inlet valve is in the slightly open state, the elongated cavity in Fig. 13 10 The internal pressure continues to decrease, and the piston 3 continues to drive the rotor of the state shown in Fig. 15 to rotate clockwise. The dotted line 400 representing the ice inlet will straddle between the through holes 4850 and 4840, that is, the inlet valve enters an open state, representing The dotted line 500 of the water supply sink is also spanned in the through holes 4S10 and 483 Between 0, the water heater enters the use state, and its waterway is similar to the above embodiments. When the hot water is used, the mixing valve 92 is closed, and the operation process is reversed. In the switching valve, the moving piece returns to the state shown in Fig. 15 counterclockwise, so that the water inlet valve 8S1 returns to the micro-opening state section, because the representative water tank in Fig. 15 The dotted line 400 is retracted from the through hole 4850 and only spans between the through hole 4840 and the water leakage slit 4851. The inlet valve is still in the slightly open state, and the moving piece continues to rotate counterclockwise, in the dotted line representing the sink 400. Before exiting the leaking joint 4851 (inlet valve closed), the dashed line 500 representing the water supply tank is switched from spanning between the through holes 4810, 4830 (the water supply valve is open, the overflow valve is closed) to span between the through holes 4810, 4820 ( When the water supply valve is closed and the overflow valve is opened, the state shown in Figure 14 is returned and the water heater returns to the standby state.

In the above embodiments, the fourth embodiment should be the simplest and practical solution in the present invention.

Claims

Claim

1. A water flow automatic control method for a water heater, comprising a water tank, a hot water pipe, a water outlet valve, a water pipe and a water supply pipe, wherein the water supply pipe supplies cold water to the water tank, and the hot water pipe extracts hot water from the water tank, wherein:

a. The water inlet of the outlet valve is connected with a connecting pipe, and a control valve for preventing the water in the connecting pipe from flowing to the hot water pipe is connected between the connecting pipe and the hot water pipe outlet, and a water-controlled expansion device is connected between the connecting pipe and the water pipe, and the connecting pipe a normally closed water supply valve is connected between the water supply pipe or the inner cavity of the water control expansion device and the water supply pipe;

e. The control valve is controlled by water pressure or controlled by a control rod of the water outlet valve or controlled by an expansion wall of the ice control expansion device, and the expansion wall of the water control expansion device controls the moment when the valve is switched, the The water valve is in a slightly open state;

f. When the water outlet valve is opened, the water control expansion device contracts, and the operation sequence of controlling the water supply valve, the overflow valve and the water inlet valve when the expansion wall of the ice control expansion device moves inward is: first closing the overflow valve and The water supply valve is opened, and finally the inlet valve is opened; when the water outlet valve is closed, the water control expansion device is expanded, and the operation sequence of controlling the water supply valve, the overflow valve and the water inlet valve when the expansion wall of the water control expansion device moves outward is: First open the inlet valve 3⁄4, then close the water supply valve and open the overflow valve.

2. The automatic water flow control method for a water heater according to claim 1, wherein a water shutoff valve is connected between the inner cavity of the water control expansion device and the water supply pipe, and the water control expansion device and the connecting pipe are disposed between a normally open water control valve, the water control valve being controlled by an expansion wall of the expansion device; when the water discharge valve is opened, the water control expansion device is contracted, and the expansion wall of the water control expansion device is controlled to move inwardly The operation sequence of the water supply valve, the overflow valve, the water control valve and the inlet valve is as follows: first close the overflow valve and open the water supply valve, close the water control valve, and finally make the inlet valve enter the open state; when the outlet valve is closed, the water control expansion device Expansion, control of the water supply valve when the expansion wall of the water-controlled expansion device moves outward The sequence of action of the door, the overflow valve, the water control valve and the inlet valve is as follows: First, the inlet valve is opened to a slightly open state, the water supply valve is closed, the overflow valve is opened, and the water control valve is finally opened.

3. The automatic water flow control method for a water heater according to claim 1, wherein the water-controlled expansion device is composed of a valve body and a piston, and a pressure spring is arranged between the piston and the valve body to receive an inward pressure of the piston. A sealing port is provided between the inner cavity of the valve body and the piston is the expansion wall.

4. The automatic water flow control method for a water heater according to claim 1, wherein the overflow valve or the water supply valve or the control valve is an electronically controlled valve, and the electronically controlled valve is controlled by an electrical switch, and the action of the electrical switch is controlled by the water control. The expansion wall of the expansion device is controlled, and the expansion wall of the water control expansion device controls the moment when the electrical switch action is switched, and the inlet valve is in a slightly open state.

5. The automatic water flow control method for a water heater according to claim 3, wherein a water blocking block is disposed in the water control expansion device, and the water inlet block of the water blocking block and the water control expansion device constitutes the water inlet valve, and water blocking When the block moves to block the water inlet of the water-controlled expansion device, the gap between the water blocking block and the water inlet of the water-controlled expansion device constitutes a slightly open state of the water inlet valve.

6. A water heater comprising a water tank, a heating element, a hot water pipe, a water outlet valve, a water pipe and a water supply pipe, wherein the water supply pipe supplies cold water to the water tank, and the hot water pipe extracts hot water from the water tank, wherein the water outlet valve is characterized by The water inlet is connected with a connecting pipe, and a control valve for preventing the water in the connecting pipe from flowing to the hot water pipe is connected between the connecting pipe and the hot water pipe outlet, and a water control expansion device is connected between the connecting pipe and the water pipe, and between the connecting pipe and the water supply pipe Or a normally closed water supply valve is connected between the inner cavity of the water control expansion device and the water supply pipe; a normally open overflow valve is connected between the water tank and the overflow pipe, and the highest point of the overflow passage formed by the overflow valve and the overflow pipe is close to or higher than the water tank The highest point; an inlet valve is provided on the passage of the water pipe to the water-controlled expansion device, and the opening of the inlet valve is divided into an open state section and a micro-open state section; the water supply valve, the overflow valve and the inlet valve are subjected to The expansion wall control of the water-controlled expansion device is described, and at the moment when the operation of the water supply valve and the overflow valve is switched, the inlet valve is in a slightly open state.

7. The water heater of claim 6 wherein said control valve is a one-way valve.

8. The water heater according to claim 6, wherein said control valve is a normally closed shutoff valve, said shut-off valve being controlled by an expansion wall of said water-controlled expansion device, and at the moment of switching of the action of the shut-off valve The water valve is in the 4 open state.

The water heater according to claim 6, wherein the water outlet valve is a water mixing valve, the connecting pipe is connected to the cold water inlet of the mixing water valve, and the outlet of the hot water pipe is connected to the hot water inlet of the mixing water valve. The hot water valve in the mixing valve is the control valve.

10. The water heater according to claim 6, wherein said water-controlled expansion device comprises a valve body and a piston, and a pressure spring is provided between the piston and the valve body to subject the piston to an inward pressure, the piston and the valve body cavity. A sealing ring is provided between the pistons.

The water heater according to claim 6, wherein a water blocking block is disposed in the water-controlled expansion device, and the water inlet block of the water blocking block and the water-controlled expansion device constitutes the water inlet valve, and the water blocking block moves to the blocking block. When the water inlet of the water control expansion device is occupied, the gap between the water blocking block and the water inlet of the water control expansion device constitutes a micro-open state section of the water inlet valve.