Differential pressure communication structure of instant water heater

Abstract

The utility model relates to a pressure difference communication structure of an instant water heater, which sequentially comprises a pressure difference switch, a first water inlet, a first water outlet, a second water inlet, a first water outlet and a second water outlet, the heating assembly communicates with the first water outlet of the differential pressure switch and is used for heating the entering water; the water outlet valve is provided with a second water inlet and a second water outlet, communicates with a water outlet pipeline of the heating assembly and is used for discharging water to the outside; a backflow pipe is arranged between the water outlet valve and the differential pressure switch, and a backflow opening is formed in the differential pressure switch and communicated with the backflow pipe. Compared with the prior art, the water outlet valve has the advantages that the backflow hole is formed in the water outlet layer of the water outlet valve, the backflow opening is formed in the differential pressure switch, the backflow opening and the backflow hole are far away as far as possible, and therefore water entering the pressure relief cavity is as much as possible, water pressure is large, and the differential pressure switch can be rapidly closed.

Description

Technical Field

[0001] The utility model relates to the technical field of electric water heaters, in particular to a differential pressure communication structure of an instant water heater. Background Art

[0002] Household water heaters include instant water faucets, electric water heaters, electric water dispensers, etc. The heating start-up system of the water heater includes a heating cavity provided with a heating pipe and a water pressure cavity provided with a floating switch. The heating pipe realizes electrical conduction or electrical cut-off through an elastic contact. When the hot water gear is turned on, water enters the water pressure cavity, and the water flow makes the floating switch float upward. The floating switch touches the elastic contact to realize the conduction of the heating pipe. When the hot water gear is turned off, there is no water inlet in the water pressure cavity, the floating switch sinks, and the elastic contact separates to realize the electrical cut-off of the heating pipe.

[0003] If the water outlet faucet does not discharge water due to reasons such as impurity accumulation and blockage, and the hot water gear is always turned on, that is, the external tap water always supplies water to the water pressure cavity, the floating switch remains in the floating state due to water pressure. This will cause the heating pipe in the heating cavity to continuously heat, and the water in the heating cavity will always be in the heating state. Eventually, the heating cavity will be burned dry until the heating pipe burns out, making the water heater scrapped. Currently, about 3-5% of instant water faucets have such a situation. Even more serious is that the heating cavity may explode due to excessive thermal air pressure, which will bring serious safety hazards.

[0004] In addition, there are some differential pressure switches with differential pressure diaphragms in the prior art, which control the on-off of the switch through the change of the diaphragm. However, when the differential pressure switch is turned off, it is necessary to drive the differential pressure diaphragm through the pressure in the pressure relief cavity. Therefore, there needs to be sufficient pressure in the pressure relief cavity to drive the differential pressure diaphragm, otherwise the differential pressure switch cannot be closed. Summary of the Utility Model

[0005] In order to solve the above problems existing in the prior art, the utility model provides a differential pressure communication structure of an instant water heater.

[0006] The above problems of the utility model are solved by the following technical solutions:

[0007] A differential pressure communication structure of an instant water heater sequentially includes:

[0008] A differential pressure switch having a first water inlet and a first water outlet, and the inlet end is communicated with the first water inlet;

[0009] A heating assembly communicated with the first water outlet of the differential pressure switch for heating the incoming water;

[0010] An outlet valve having a second water inlet and a second water outlet, communicated with the outlet pipeline of the heating assembly for discharging water to the outside;

[0011] A return pipe is arranged between the water outlet valve and the differential pressure switch, and the differential pressure switch is provided with a return port communicating with the return pipe.

[0012] By adopting the above technical solution, after the water supply stops, there is no water inlet in the pressurizing chamber, the water pressure disappears, and in the water circuit, there is a large amount of residual water in the heating component and the water outlet valve. This residual water flows back through the return pipe, causing the water pressure in the pressure relief chamber to increase rapidly, so that the differential pressure diaphragm can be quickly squeezed towards the pressurizing chamber side, and the differential pressure switch can be quickly disconnected.

[0013] The further setting of the above technical solution is: the differential pressure switch includes a switch body and a differential pressure diaphragm arranged inside the switch body. The differential pressure diaphragm divides the inner cavity of the switch body into a pressurizing chamber and a pressure relief chamber, and the return port communicates with the pressure relief chamber.

[0014] The further setting of the above technical solution is: the pressurizing chamber communicates with the water inlet and outlet of the switch body, and the pressure relief chamber is connected to the return port of the switch body;

[0015] A moving contact and a fixed contact communicating with the heating circuit of the water heater are arranged on the switch body. The moving end of the moving contact is driven by the differential pressure diaphragm to contact or separate from the fixed contact, thereby making the heating circuit conduct or disconnect.

[0016] The further setting of the above technical solution is: the water outlet valve includes a valve body and a water temperature regulating mechanism arranged inside the valve body. The water temperature regulating mechanism can detect the water temperature of the flowing water in the valve body and control the water flow according to the detected water temperature to adjust the water temperature of the outlet water.

[0017] The further setting of the above technical solution is: it further includes a manual adjustment. The manual adjustment member is connected to the water temperature regulating mechanism to adjust the position of the water temperature regulating mechanism so that the water temperature regulating mechanism is in the temperature adjustment position.

[0018] The further setting of the above technical solution is: the water temperature regulating mechanism includes a thermal actuating element and a plug driven by the thermal actuating element. The plug adjusts the water flow rate flowing out of the valve body by changing its position.

[0019] The further setting of the above technical solution is: a water passing port is arranged inside the valve body, and the plug controls the water volume flowing through the water passing port.

[0020] The further setting of the above technical solution is: a water blocking sleeve group is arranged inside the valve body. The manual adjustment member is connected to the water blocking sleeve group, and the water temperature regulating mechanism is installed inside the water blocking sleeve group.

[0021] The further setting of the above technical solution is as follows: The valve body includes an upper valve body and a lower valve body that are fixedly connected to each other. An extension pipe is provided on the lower valve body and extends into the upper valve body, and the water passing port is arranged on the extension pipe.

[0022] The further setting of the above technical solution is as follows: An outlet water layer is formed between the water retaining sleeve group and the inner wall of the upper valve body, and the outlet water layer is communicated with the second water outlet of the outlet valve;

[0023] The outlet water layer is provided with a water return port.

[0024] By adopting the above technical solution, the water return hole is arranged in the outlet water layer to make it as far away from the water return port as possible, so that the amount of water entering the pressure relief cavity is as large as possible, the water pressure is high, and the differential pressure switch can be quickly closed.

[0025] Compared with the prior art, the beneficial effect of the present utility model is that the water return hole is arranged in the outlet water layer of the outlet valve, and the water return port is arranged on the differential pressure switch, so that the water return port and the water return hole are as far away from each other as possible, so that the amount of water entering the pressure relief cavity is as large as possible, the water pressure is high, and the differential pressure switch can be quickly closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the present utility model.

[0027] Figure 2 It is an exploded structural diagram of the differential pressure switch.

[0028] Figure 3 It is a sectional structural diagram of the differential pressure switch.

[0029] Figure 4 It is a sectional structural diagram of the outlet valve.

[0030] Figure 5 It is a schematic structural diagram of the water temperature adjustment mechanism.

[0031] Figure 6 It is an exploded structural diagram of the valve body.

[0032] Labels on the drawings: 100, differential pressure switch; 101, first water inlet; 102, first water outlet; 103, water return port;

[0033] 200, heating component;

[0034] 300, differential pressure diaphragm;

[0035] 800, outlet valve; 801, second water inlet; 802, second water outlet; 804, water return hole;

[0036] 920, thermal actuator; 910, connecting rod;

[0037] 500. Fixed contact piece;

[0038] 600. Moving contact piece;

[0039] 9. Return pipe; a. Pressure boosting chamber; b. Pressure relief chamber; 5. Operating part; 1. Plug; 101. Water passing part; 4. Water blocking sleeve group; c. Water outlet layer. Specific implementation manner

[0040] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manner, structure, features and their effects of the present utility model as follows.

[0041] As Figure 1-6 shown, the following embodiments disclose a differential pressure connection structure of an instant water heater.

[0042] A differential pressure connection structure of an instant water heater sequentially includes

[0043] A differential pressure switch 100 having a first water inlet 101 and a first water outlet 102, and the water inlet end is connected to the first water inlet 101;

[0044] A heating component 200 connected to the first water outlet 102 of the differential pressure switch 100 for heating the incoming water;

[0045] A water outlet valve 800 having a second water inlet 801 and a second water outlet 802, connected to the water outlet pipeline of the heating component 200 for discharging water to the outside;

[0046] A return pipe 9 is provided between the water outlet valve 800 and the differential pressure switch 100, and a return port 103 is provided on the differential pressure switch 100 and is connected to the return pipe 9.

[0047] The above is the basic solution of this embodiment.

[0048] Referring to Figure 1 shown, the differential pressure switch 100, the heating component 200 and the water outlet valve 800 are connected in series to form a water path. The external water supply device supplies water to the differential pressure switch 100, and water enters from the first water inlet 101. When the water inlet reaches a certain level, the differential pressure switch 100 opens. At this time, the heating component 200 is powered on and heated, and the water entering the heating component 200 is heated. The hot water enters the second water inlet 801 of the water outlet valve 800 from the heating component 200.

[0049] When closing, the first water inlet 101 stops water inlet. At this time, the water remaining in the water path flows back through the return pipe 9, disconnecting the differential pressure switch 100.

[0050] In this embodiment, the differential pressure switch 100 includes a switch body and a differential pressure diaphragm 300 disposed inside the switch body. The differential pressure diaphragm 300 divides the inner cavity of the switch body into a pressurizing chamber a and a pressure relief chamber b, and the return port 103 communicates with the pressure relief chamber b.

[0051] Specifically referring to Figure 2 and Figure 3 As shown, the switching principle of the differential pressure switch 100 is as follows: When the water heater is turned on, the water supply device supplies water to the water heater from the first water inlet 101. Cold water enters the pressurizing chamber a through the first water inlet 101, and in the pressurizing chamber a, the differential pressure diaphragm 300 is pushed upward, causing the differential pressure diaphragm 300 to bulge toward the pressure relief chamber b side, thereby turning on the heating circuit.

[0052] After the water heater is used up, the water supply device stops supplying water. At this time, the pressurizing effect of cold water on the pressurizing chamber a disappears. Since there is still water in the water circuit that has not been released, the remaining water enters the pressure relief chamber b through the return pipe 9. At this time, the pressure in the pressure relief chamber b is greater than the pressure in the pressurizing chamber a, pressing the differential pressure diaphragm 300 downward and turning off the heating circuit.

[0053] That is to say, when the water supply device supplies water to the water heater, the heating circuit is turned on; when the water supply device stops supplying water to the water heater, the heating circuit is turned off.

[0054] Thus, it can be ensured that there is water in the water circuit of the water heater before turning on the heating component, avoiding dry burning of the heating component and also avoiding cold water flowing out due to the heating circuit being turned off during the water supply process.

[0055] The advantage of setting the return port 103 on the water outlet valve 800 is that after the water supply stops, there is no water inlet in the pressurizing chamber a and the water pressure disappears. In the water circuit, there is a large amount of remaining water in the heating component 200 and the water outlet valve 800. This remaining water flows back through the return pipe 9, causing the water pressure in the pressure relief chamber b to increase rapidly, so that the differential pressure diaphragm 300 can be quickly squeezed toward the pressurizing chamber a side, quickly turning off the differential pressure switch 100.

[0056] In this embodiment, the specific setting manner of the differential pressure switch 100 and the heating circuit is as follows:

[0057] The pressurizing chamber a communicates with the water inlet and water outlet of the switch body, and the pressure relief chamber b is connected to the return port 103 of the switch body;

[0058] A moving contact 600 and a fixed contact 500 communicating with the heating circuit of the water heater are provided on the switch body. The movable end of the moving contact 600 is driven by the differential pressure diaphragm 300 to contact or disengage from the fixed contact 500, thereby turning on or off the heating circuit.

[0059] The differential pressure diaphragm 300 is installed inside the switch body, separating the switch body into upper and lower chambers. In this embodiment, the upper chamber is set as the pressure relief chamber b, and the lower chamber is set as the pressure increasing chamber a; the fixed contact 500 is fixed on the differential pressure cover, one end of the moving contact 600 is fixed on the differential pressure cover, and the other end is driven by the differential pressure diaphragm 300 to make contact with and disengage from the fixed contact 500, thereby controlling the conduction or disconnection of the heating circuit.

[0060] In this embodiment, the specific setting of the water outlet valve 800 is as follows: the water outlet valve 800 includes a valve body and a water temperature adjustment mechanism arranged inside the valve body. The water temperature adjustment mechanism can detect the water temperature of the flowing water inside the valve body and control the water flow rate according to the detected water temperature to adjust the water temperature of the outlet water.

[0061] Refer to Figure 4 As shown, hot water enters from the heating assembly 200 into the second water inlet 801 of the water outlet valve 800, and the water temperature adjustment mechanism inside the water outlet valve 800 detects and adjusts the hot water in the water passing cavity; to ensure that the water supplied to the outside from the second water outlet 802 is hot water at the set temperature.

[0062] In this embodiment, there is also a manual adjustment member 5, which is connected to the water temperature adjustment mechanism to adjust the position of the water temperature adjustment mechanism so that the water temperature adjustment mechanism is in the temperature adjustment position.

[0063] Specifically, the water temperature adjustment mechanism includes a thermal actuating element 920 and a plug 1 driven by the thermal actuating element 920. The plug 1 adjusts the water flow rate flowing out of the valve body by changing its position.

[0064] The principle of automatic temperature adjustment is: when water enters the water outlet valve 800, the thermal actuating element 920 detects the temperature of the hot water inside the valve body. When the detected temperature is higher than the set temperature, the water temperature adjustment mechanism acts to reduce the hot water output. At this time, the cold water inflow rate at the first water inlet 101 decreases accordingly. However, the heating power of the heating assembly remains unchanged. Therefore, the temperature of the hot water formed by the cold water passing through the heating assembly increases, thereby increasing the outlet water temperature;

[0065] Similarly, when the detected temperature is lower than the set temperature, the water temperature adjustment mechanism moves in the reverse direction to increase the hot water output. Then, the cold water inflow rate increases, thereby reducing the outlet water temperature;

[0066] Operate the manual adjustment member 5 to drive the water temperature adjustment mechanism to the temperature adjustment position. The water temperature adjustment mechanism at this temperature adjustment position can automatically adjust the hot water output, thereby achieving constant temperature water outlet.

[0067] It should be noted that in this embodiment, the water temperature adjustment mechanism has its own adjustment range limit. If its position is lower than its adjustment upper limit, at this time, if the water temperature is too low and the water temperature adjustment mechanism cannot make the water output lower, then the water temperature cannot be adjusted.

[0068] Similarly, if the position of the water temperature adjustment mechanism is higher than its adjustment lower limit, when the water temperature is too high, the water temperature adjustment mechanism cannot make the water output larger, so the water temperature cannot be adjusted.

[0069] The thermal dynamic element is a component that can convert thermal energy into mechanical energy. It has the function of quickly and automatically transmitting mechanical actions after sensing temperature changes. Its mechanical actions are applied with thermal expansion materials. Its mechanical actions are not affected by the surrounding environment. It is a key component of various temperature adjustment and control systems, and has the advantages of accurate temperature adjustment and control, simple structure, etc. It is applied in fields such as the automotive industry, building heating, sanitary bathing, HVAC, industrial automatic control, fire extinguishing, household appliances, solar water heaters, petrochemical industry, ships, safety devices, aerospace, etc.

[0070] A plug 1 is connected to the thermal dynamic element 920 through a connecting rod 910. When the thermal dynamic element 920 senses the water temperature and drives the connecting rod 910 according to the water temperature, the plug 1 is driven to move, thereby adjusting the water flow rate flowing out of the valve body.

[0071] Matched with the plug 1, in this embodiment, a water passing port is arranged in the valve body, and the plug 1 controls the water volume flowing through the water passing port.

[0072] When the plug 1 blocks the water passing port, it has the lowest water flow rate. When the plug 1 completely disengages from the water passing port 811, it has the largest water flow rate.

[0073] In the initial state, the water temperature entering the water passing cavity is relatively low water. Due to the effect of the plug 1, if the low-temperature water cannot pass through the water passing port, it cannot be sensed by the thermal dynamic element 900, so the position of the plug 1 cannot be adjusted. Therefore, in this embodiment, a water passing part 1.1 is arranged on the plug 1. When the plug 1 blocks the water passing port, the water flows through the water passing part 1.1.

[0074] That is, the minimum flow rate is not zero flow rate, and there will still be a small amount of water flowing through.

[0075] Refer to Figure 5 As shown, in this embodiment, the water passing part 1.1 is an inclined notch arranged on the plug 1. When the end face of the plug 1 blocks the water passing port, a gap is formed between the notch and the edge of the water passing port, so that a small amount of water can flow through.

[0076] In this embodiment, the manual adjusting member 5 can drive the water temperature adjusting mechanism to move the plug 1 to the temperature adjusting position.

[0077] In order to enable the manual adjusting member 5 outside the water outlet valve 800 to drive the water temperature adjusting mechanism inside the water outlet valve 800, in this embodiment, a water retaining sleeve group 4 is arranged in the valve body, the manual adjusting member 5 is connected to the end of the water retaining sleeve group 4, and the water temperature adjusting mechanism is installed on the water retaining sleeve group 4.

[0078] The manual adjusting member 5 and the water retaining sleeve group 4 are connected by screw threads in the middle. By rotating the manual adjusting member 5, the water retaining sleeve group 4 can move linearly along its own axis direction, thereby driving the movement of the water temperature adjusting mechanism.

[0079] The valve body includes an upper valve body 820 and a lower valve body 810 which are fixedly connected to each other. An extension pipe 812 is provided on the lower valve body 810 and extends into the upper valve body 820, and the water passing port 811 is arranged on the extension pipe 812.

[0080] In this embodiment, hot water is introduced into the valve body from the side of the lower end of the valve body, and flows upward in the center of the valve body. After passing through the water passing port 811, it is output toward the outside. The second water outlet 802 is arranged on the side of the valve body;

[0081] Refer to Figure 6 As shown, an outlet water groove 813 is axially arranged on the outer wall of the extension pipe 812, and the upper end of the outlet water groove 813 extends to the end of the extension pipe 812; that is, when the hot water enters above the extension pipe 812 through the water passing hole, it can be output to the outside of the extension pipe 812 through the outlet water groove 813.

[0082] The extension pipe 812 is located in the water passing groove b. An outlet water channel is formed between the outlet water groove 813 on the outer wall of the extension pipe 812 and the inner wall of the water retaining groove b. The hot water enters between the upper valve body 820 and the water retaining sleeve group 4 through the outlet water channel.

[0083] An outlet water layer c is formed between the water retaining sleeve group 4 and the inner wall of the upper valve body 820, and the outlet water layer c is communicated with the second water outlet 802 of the water outlet valve 800;

[0084] The outlet water layer c is provided with a water return port 804.

[0085] This outlet water layer c is an annular channel formed between the water retaining sleeve group 4 and the inner wall of the upper valve body 820. The water return port 804 is communicated with the differential pressure switch 100 through a water return pipeline.

[0086] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present utility model by using the technical content disclosed above. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A differential pressure connection structure of an instant water heater, successively including: A differential pressure switch (100) having a first water inlet (101) and a first water outlet (102), and its water inlet end is connected to the first water inlet (101); A heating component (200) connected to the first water outlet (102) of the differential pressure switch (100) for heating the incoming water; A water outlet valve (800) having a second water inlet (801) and a second water outlet (802), connected to the water outlet pipeline of the heating component (200) for discharging water to the outside; It is characterized in that: A return pipe (9) is provided between the water outlet valve (800) and the differential pressure switch (100), and a return port (103) is provided on the differential pressure switch (100) and is connected to the return pipe (9); The differential pressure switch (100) includes a switch body and a differential pressure diaphragm (300) provided inside the switch body. The differential pressure diaphragm (300) divides the inner cavity of the switch body into a pressure increasing chamber (a) and a pressure relieving chamber (b), and the return port (103) is connected to the pressure relieving chamber (b); The pressure increasing chamber (a) is connected to the water inlet and outlet of the switch body, and the pressure relieving chamber (b) is connected to the return port (103) of the switch body; A moving contact piece (600) and a fixed contact piece (500) connected to the heating circuit of the water heater are provided on the switch body. The moving end of the moving contact piece (600) is driven by the differential pressure diaphragm (300) to contact or separate from the fixed contact piece (500), thereby turning on or off the heating circuit.

2. The differential pressure communication structure of the instant water heater according to claim 1, characterized in that: The water outlet valve (800) includes a valve body and a water temperature regulating mechanism provided inside the valve body. The water temperature regulating mechanism can detect the water temperature of the flowing water inside the valve body and control the water flow passing through according to the detected water temperature to adjust the water temperature of the discharged water.

3. The differential pressure communication structure of the instant water heater according to claim 2, characterized in that: It further includes a manual adjusting member (5), and the manual adjusting member (5) is connected to the water temperature regulating mechanism to adjust the position of the water temperature regulating mechanism so that the water temperature regulating mechanism is in the temperature adjusting position.

4. The differential pressure communication structure of the instant water heater according to claim 3, characterized in that: The water temperature regulating mechanism includes a thermal actuator (900) and a plug (1) driven by the thermal actuator (900). The plug (1) adjusts the water flow rate flowing out of the valve body by changing its position.

5. The differential pressure connection structure of the instant water heater according to claim 4, characterized in that: A water passing port (811) is provided inside the valve body, and the plug (1) controls the water volume flowing through the water passing port (811).

6. The differential pressure communication structure of the instant water heater according to claim 5, characterized in that: A water blocking sleeve group (4) is provided inside the valve body. The manual adjusting member (5) is connected to the water blocking sleeve group (4), and the water temperature regulating mechanism is installed on the water blocking sleeve group (4).

7. The differential pressure connection structure of the instant water heater according to claim 6, characterized in that: The valve body includes an upper valve body (820) and a lower valve body (810) fixedly connected to each other. An extension pipe (812) is provided on the lower valve body (810) and extends into the upper valve body (820), and the water passing port (811) is provided on the extension pipe (812).

8. The differential pressure communication structure of the instant water heater according to claim 7, characterized in that: An outlet water layer (c) is formed between the water blocking sleeve group (4) and the inner wall of the upper valve body (820), and the outlet water layer (c) is connected to the second water outlet (802) of the water outlet valve (800); The outlet water layer (c) is provided with a water return port (804).

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