A mechanical front control valve with automatic power-off and water-discharging function

Abstract

The present invention discloses a mechanical front control valve with an automatic power-off water outlet function, comprising a shell, a mains power access plug, a plug output end, a contact device and a power-off water outlet control device installed in the shell, wherein the end of the shell is provided with a water outlet for connecting to an inner tank of an electric water heater, the contact device is used to control the mains power access plug and the plug output end to be connected or disconnected, and the power-off water outlet control device is movably connected to the water outlet; the power-off water outlet control device comprises a water inlet pipe, a fixed seat and a sliding water outlet seat, the water inlet pipe is penetrated and arranged on the fixed seat, and the sliding water outlet seat is slidably sleeved with the water inlet pipe to connect or block the water inlet pipe and the water outlet; the present invention, through reasonable structural improvement, allows the mains power access plug and the plug output end to be automatically blocked when discharging water, and allows the mains power access plug and the plug output end to be automatically connected after water use is stopped, thereby realizing the function of power-off water outlet, and also has the characteristics of rapid response, safety, reliability and low cost.

Description

Technical Field

[0001] The invention relates to the field of electric water heaters, and in particular to a mechanical front control valve with an automatic power-off water-discharging function. Background Art

[0002] Electric water heaters are water heaters that use electricity as energy to heat water. Every year, there are many personal injury accidents caused by the use of electric water heaters in my country. The reasons are mostly caused by environmental leakage (no ground wire, or ground wire failure, ground wire live, water pipe live, etc.). Therefore, the safety of electric water heaters is receiving more and more attention.

[0003] Existing electrically heated storage water heaters generally include a T-shaped shell, an inner tank, water inlet and outlet pipes, a heating body fixed in the inner tank and its control circuit, and the water heating step is achieved through the heating body in the inner tank. Among them, the electrically heated storage water heater may have leakage accidents due to aging of the heating body or corrosion of hot water. When the user is using hot water, if the electric water heater is still powered on for heating, there will be great safety hazards. Although some electric water heaters will automatically switch to the insulation state after the hot water is heated to the set value, because the heating body is still in the power-on state, because the heating body is connected to the alternating current, there is always a great safety hazard. At present, in order to prevent leakage accidents, water storage water heaters made of electric heating elements generally adopt the method of adding leakage protectors or isolation walls or water outlet power-off functions to ensure safety. However, the above method has the following shortcomings:

[0004] 1. The leakage protector often does not work, works randomly or works late due to the inversion of the live wire and the neutral wire during installation, the lack of ground wire, and the reliability and stability of the protector itself, which brings a lot of trouble to the use. In order to ensure safety, users want to completely cut off the power supply when bathing. Although the leakage protector has a power switch, the socket is higher than the water tank of the water heater to avoid water, so it is very inconvenient to operate the switch. The automatic power-off actuator of the leakage protection is located in the control circuit of the electric water heater. When it automatically cuts off the power for protection, the lead wire from the plug to the electric water heater is still energized. Therefore, when the wiring harness is damaged or other similar situations exist, the electric water heater may still be energized. The need for manual reset to restore power also makes users feel inconvenient.

[0005] 2. The electric isolation wall only prolongs the water flow, increases the resistance and reduces the leakage voltage, but it cannot eliminate the leakage, which is a pain for people with sensitive skin.

[0006] 3. The water outage power-off function is to cut off the power supply when water is out, which prevents the harm of leakage to people. It is an ideal solution to leakage, that is, when the electric water heater is out of water, the power supply of the electric water heater is automatically cut off. When this function is implemented, a water flow sensor is required to detect whether the electric water heater is out of water. Therefore, when the water flow sensor detects the water flow, the water flow sensor sends the water flow signal to the electric water heater data acquisition module, and the electric water heater data acquisition module sends the stop signal to the control module. The control module drives the leakage protection assembly to cut off the power supply to the electric water heater heating body. Although this type of electric water heater has realized the water outage power-off function for the heating body, other working electrical components in the electric water heater (such as display screen, main control board, etc.) are still in the power supply state, and there will still be safety hazards in extreme cases. In addition, some electric water heater manufacturers now use water outlet circuit breakers, but they are installed inside the electric water heaters for self-protection. For the large number of electric water heaters on the market that do not have water outlet circuit breakers installed, if you want to install water outlet circuit breakers to completely solve the leakage problem, you have to disassemble the water heater and change the circuit, which is not only troublesome and difficult for consumers to accept, but also easy to cause accidents due to wiring errors. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a mechanical front control valve with an automatic power-off water discharge function to solve the deficiencies in the prior art.

[0008] In order to solve the above technical problems, the technical solution of the present invention is: a mechanical front control valve with automatic power-off water outlet function, including a shell, a mains access plug, a plug output end, a contact device and a power-off water outlet control device installed in the shell, the end of the shell is provided with a water outlet for connecting to the inner tank of the electric water heater, the contact device is used to control the mains access plug and the plug output end to be connected or disconnected, the power-off water outlet control device is movably connected to the water outlet; the power-off water outlet control device includes a water inlet pipe, a fixed seat and a sliding water outlet seat, the water inlet pipe is connected to the inner tank of the electric water heater, and the contact device is used to control the connection or disconnection of the mains access plug and the plug output end, and the power-off water outlet control device is movably connected to the water outlet; the power-off water outlet control device includes a water inlet pipe, a fixed seat and a sliding water outlet seat, and the water inlet pipe is connected to the inner tank of the electric water heater. The water outlet seat is inserted on the fixed seat, and the sliding water outlet seat is slidably connected with the water inlet pipe to connect or block the water inlet pipe and the water outlet; the contact device includes a fixed contact and a moving contact, the fixed contact is electrically connected to the mains access plug, and the moving contact is electrically connected to the plug output end. The fixed contact is arranged on the end face of the fixed seat facing the sliding water outlet seat, and the moving contact is arranged on the end face of the sliding water outlet seat facing the fixed contact. When the moving contact and the fixed contact are in contact, the mains access plug and the plug output end are connected, and when the moving contact and the fixed contact are disconnected, the mains access plug and the plug output end are disconnected.

[0009] As an improvement, the sliding water outlet seat includes a sleeve adapted to the water inlet pipe of the outer sleeve, a mounting plate for installing the moving contact and a sleeve bottom plate for closing the water inlet pipe, the mounting plate is arranged at one end of the sleeve away from the sleeve bottom plate, and a water outlet gap for connecting the water inlet pipe and the water outlet is provided on the side wall of the sleeve close to the sleeve bottom plate, and the water outlet gap ring is arranged on the side wall of the sleeve.

[0010] As an improvement, a first sealing ring installation groove for installing a sealing ring is also provided on the side wall of the sleeve.

[0011] As an improvement, a second sealing ring installation groove and a third sealing ring installation groove are provided on the side wall of the water inlet pipe embedded in one end of the sleeve.

[0012] As an improvement, one end of the water inlet pipe embedded in the sleeve is also coaxially sleeved with a return spring, one end of the return spring abuts against the fixing seat, and the other end of the return spring abuts against the mounting plate.

[0013] As an improvement, a mounting portion for positioning and installing a fixed contact is provided on the end surface of the fixing seat facing the sliding water outlet seat, and an avoidance gap for avoiding the mains access plug and the plug output end is also provided on the edge of the fixing seat.

[0014] As an improvement, the contact device includes two groups of identical fixed contacts and moving touch plates, one group of fixed contacts is electrically connected to the mains access plug, and the other group of fixed contacts is electrically connected to the plug output end, the two groups of fixed contacts are symmetrically arranged on the end surface of the fixed seat facing the sliding water outlet seat, and the moving touch plate is arranged on the end surface of the sliding water outlet seat facing the fixed contacts, when the two groups of moving touch plates and the two groups of fixed contacts are in contact one by one respectively, the mains access plug and the plug output end are connected, and when the two groups of moving touch plates and the two groups of fixed contacts are disconnected, the mains access plug and the plug output end are disconnected.

[0015] As an improvement, the shell includes a front shell and a rear cover, the water outlet is arranged at the end of the front shell, the sliding water outlet seat is slidably installed in the front shell, the fixed seat is installed at one end of the front shell away from the water outlet, and the rear cover is threadedly covered on the front shell to fix the fixed seat on the front shell.

[0016] As an improvement, a slide rail for guiding the sliding water outlet seat is provided in the front shell, and a slide groove for sliding in cooperation with the slide rail is provided on the sliding water outlet seat.

[0017] As an improvement, a fourth sealing ring installation groove is provided on the side wall of the front shell.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention realizes the function of water discharge in the event of power failure by means of reasonable structural improvement. The utility power access plug and the plug output end are automatically blocked when water is discharged, and the utility power access plug and the plug output end are automatically connected after water is stopped, thereby realizing the function of water discharge in the event of power failure. The present invention also has the characteristics of rapid response, convenient and fast use, safety and reliability, and low cost.

[0020] (2) The present invention can also be flexibly installed on other water heaters. Since the installation of the present invention does not require the electric water heater to be disassembled, it is convenient to upgrade and transform. In this way, by connecting the required water heater to this mechanical front control valve, the existing electric water heater that lacks leakage protection function can be easily equipped with a power-off water discharge function. This is especially true for those old electric water heaters that are still in large quantities and are prone to leakage. Ordinary leakage protection plugs may face the possibility of the leakage protection function failing or the leakage protection being untimely due to the aging of electronic components. The present invention can improve safety, extend the service life of the electric water heater, and ensure the user's bathing safety and usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0022] Figure 2 yes Figure 1 Schematic diagram of the decomposition structure.

[0023] Figure 3 It is a schematic diagram of the structure of the present invention when the power is cut off and water is discharged.

[0024] Figure 4 This is a schematic diagram of the structure of the present invention when it is powered on and water-stopped.

[0025] Figure 5 It is a schematic diagram of the structure of the fixed contact on the fixed base in the first embodiment of the present invention.

[0026] Figure 6 It is a structural schematic diagram of the movable contact on the sliding water outlet seat in the first embodiment of the present invention.

[0027] Figure 7 It is a three-dimensional structural schematic diagram of the sliding water outlet seat of the present invention.

[0028] Figure 8 It is a three-dimensional structural schematic diagram of the fixing seat and the water inlet pipe of the present invention.

[0029] Fig. 9 It is a schematic diagram of the structure of the fixed contact on the fixed base in the second embodiment of the present invention.

[0030] Fig.10 It is a structural schematic diagram of the movable touch plate on the sliding water outlet seat in the second embodiment of the present invention.

[0031] Fig.11 It is a schematic diagram of the structure of the interior of the front shell of the present invention.

[0032] In the figure: housing 1, mains access plug 2, plug output terminal 3, contact device 4, power-off water outlet control device 5, water outlet 6, reset spring 7, front shell 10, rear cover 11, fixed contact 40, moving contact 41, moving contact plate 42, water inlet pipe 50, fixed seat 51, sliding water outlet seat 52, slide rail 100, fourth sealing ring mounting groove 101, positioning protrusion 102, second sealing ring mounting groove 500, third sealing ring mounting groove 501, mounting portion 510, avoidance gap 511, sleeve 520, mounting plate 521, sleeve bottom plate 522, water outlet gap 523, first sealing ring mounting groove 524, slide groove 525. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1 , Figure 3 and Figure 4 As shown, a mechanical front control valve with automatic power-off water outlet function includes a housing 1, a mains access plug 2, a plug output terminal 3, a contact device 4, and a power-off water outlet control device 5 installed in the housing 1. The end of the housing 1 is provided with a water outlet 6 for connecting to the inner tank of the electric water heater. The contact device 4 is used to control the connection or disconnection of the mains access plug 2 and the plug output terminal 3. The plug output terminal 3 is matched and connected with the socket of the electric water heater, and the power-off water outlet control device 5 is movably connected to the water outlet 6. The function of the power-off water outlet control device 5 is that when water enters the inner tank of the electric water heater, the mains access plug 2 and the plug output terminal 3 are automatically disconnected, ensuring that the water in the inner tank of the electric water heater is disconnected from the mains when it flows (including hot water outflow and cold water inflow), ensuring a five-point safe use state. When the water in the inner tank of the electric water heater is no longer flowing and is in a static state, it indicates that the electric water heater has stopped discharging or receiving water. At this time, the mains access plug 2 and the plug output terminal 3 are automatically connected, so that the power supply of the heating tube in the electric water heater is turned on. At this time, the electric water heater can heat or keep the water in the inner tank warm, playing the role of power-off water outlet protection. Compared with the existing electric water heaters, most of which use three-level leakage protection plugs or anti-electricity walls or relays, the present invention uses a mechanical power-off water outlet control device 5 to achieve a complete leakage protection state, which is equivalent to the user unplugging the plug of the electric water heater before using it, but it saves the trouble of manually plugging and unplugging the plug, and can automatically cut off the power when in use or automatically connect the power when not in use, so as to improve the user's experience, and also reduce the cost caused by the use of electrified components. Next, it will be further introduced how the power-off water outlet control device 5 and the contact device 4 automatically connect or disconnect the mains access plug 2 and the plug output terminal 3.

[0035] like Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8As shown, this is the first embodiment of the present invention, the power-off water outlet control device 5 includes a water inlet pipe 50, a fixed seat 51 and a sliding water outlet seat 52, the water inlet pipe 50 penetrates and is vertically arranged on the fixed seat 51, and the sliding water outlet seat 52 is slidably sleeved with the water inlet pipe 50 to connect or block the water inlet pipe 50 and the water outlet 6. The sliding water outlet seat 52 can slide in the housing 1, so that the water inlet pipe 50 and the water outlet 6 are connected or blocked, thereby controlling the water to flow into the inner tank of the electric water heater after passing through the water inlet pipe 50 and the water outlet 6. Specifically, the sliding water outlet seat 52 includes a sleeve 520 adapted to the outer sleeve water inlet pipe 50, a mounting plate 521 for mounting the moving contact 41 and a sleeve bottom plate 522 for closing the water inlet pipe 50, the mounting plate 521 is symmetrically arranged at one end of the sleeve 520 away from the sleeve bottom plate 522, and a water outlet gap 523 for connecting the water inlet pipe 50 and the water outlet 6 is provided on the side wall of the sleeve 520 close to the sleeve bottom plate 522, and the water outlet gap 523 is arranged on the side wall of the sleeve 520. Since the sliding water outlet seat 52 is slidable, when the sleeve bottom plate 522 is pressed against the right end of the water inlet pipe 50, the water inlet pipe 50 is in a blocked state, thereby blocking the connection between the water inlet pipe 50 and the water outlet 6. When the sleeve bottom plate 522 leaves the right end of the water inlet pipe 50, the water inlet pipe 50 is connected with the water outlet 6 through the water outlet gap 523. The water entering from the water inlet pipe 50 can pass through the water outlet gap 523 and then enter the water outlet 6, and then flow from the water outlet 6 to the inner tank of the electric water heater. Since there is a water pressure difference between the water inlet pipe 50 and the inner tank of the electric water heater, when the water in the inner tank of the electric water heater is not full, the water pressure of the water inlet pipe 50 is always greater than the water pressure in the inner tank of the electric water heater. Therefore, the water entering from the water inlet pipe 50 pushes the sliding water outlet seat 52 away from the fixed seat 51, so that the sleeve bottom plate 522 leaves the right end of the water inlet pipe 50, so that the water passes through the water inlet pipe 50, the water outlet gap 523, and the water outlet 6 in sequence and then enters the inner tank of the electric water heater. When the water in the inner tank of the electric water heater is full (the electric water heater is not in use at this time), the water pressure in the inner tank of the electric water heater is greater than the water pressure of the water inlet pipe 50. In this case, the sliding water outlet seat 52 moves toward the fixed seat 51 until the sleeve bottom plate 522 presses against the right end of the water inlet pipe 50, so that the water inlet pipe 50 and the water outlet 6 are blocked, thereby playing the function of automatically passing or cutting off water. Of course, when the mixing valve of the electric water heater is opened (that is, the electric water heater is in use), the water in the inner tank of the electric water heater flows out when the mixing valve is opened, so that the water pressure in the inner tank is reduced. At this time, the water pressure of the water inlet pipe 50 is greater than the water pressure in the inner tank of the electric water heater again. At this time, the water entering the water inlet pipe 50 pushes the sliding water outlet seat 52 away from the fixed seat 51 again, so that the sleeve bottom plate 522 leaves the right end of the water inlet pipe 50 again, replenishing water to the inner tank of the electric water heater.

[0036] Furthermore, a first sealing ring installation groove 524 for installing a sealing ring is provided on the side wall of the sleeve 520, and a second sealing ring installation groove 500 and a third sealing ring installation groove 501 are provided on the side wall of the water inlet pipe 50 embedded in one end of the sleeve 520. The first sealing ring installation groove 524, the second sealing ring installation groove 500 and the third sealing ring installation groove 501 are respectively provided with rubber sealing rings to prevent water leakage, thereby protecting the AC power access plug 2, the plug output terminal 3 and the contact device 4.

[0037] Furthermore, one end of the water inlet pipe 50 embedded in the sleeve 520 is also coaxially sleeved with a return spring 7, one end of the return spring 7 abuts on the fixed seat 51, and the other end of the return spring 7 abuts on the mounting plate 521. The function of the return spring 7 is to make the sliding water outlet seat 52 slide faster and react more sensitively, thereby ensuring the normal operation of the sliding water outlet seat 52.

[0038] Therefore, in conjunction with the automatic water supply or water supply function of the power-off water supply control device 5, the contact device 4 can perform corresponding power-on or power-off settings on this basis, so as to achieve the purpose of power-off water supply. Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Fig.11 As shown, the contact device 4 includes a fixed contact 40 and a moving contact 41, the fixed contact 40 is electrically connected to the mains access plug 2, the moving contact 41 is electrically connected to the plug output terminal 3, the fixed contact 40 is arranged on the end surface of the fixed seat 51 facing the sliding water outlet seat 52, and the moving contact 41 is arranged on the end surface of the mounting plate 521 of the sliding water outlet seat 52 facing the fixed contact 40. In order to prevent the mains access plug 2 and the plug output terminal 3 from being unable to be connected due to poor contact, in this embodiment, the number of the fixed contacts 40 and the moving contacts 41 are two respectively, the live wire and the neutral wire of the mains access plug 2 are electrically connected to the two fixed contacts 40 respectively, and the live wire and the neutral wire of the plug output terminal 3 are electrically connected to the two moving contacts 41 respectively, and the ground wire of the mains access plug 2 is always directly connected to the ground wire of the plug output terminal 3, which should be understood by those skilled in the art. Since the sliding water outlet seat 52 is slidable, it means that the moving contact 41 also moves with the sliding water outlet seat 52. When the sleeve bottom plate 522 of the sliding water outlet seat 52 is pressed against the right end of the water inlet pipe 50, the moving contact 41 and the fixed contact 40 are in contact, and the AC power access plug 2 and the plug output terminal 3 are connected. When the sleeve bottom plate 522 leaves the right end of the water inlet pipe 50, the moving contact 41 and the fixed contact 40 are disconnected, and the AC power access plug 2 and the plug output terminal 3 are disconnected, thereby achieving the purpose of powering off to discharge water and powering on to stop water discharge.

[0039] Furthermore, a mounting portion 510 for positioning and mounting the fixed contact 40 is provided on the end surface of the fixing seat 51 facing the sliding water outlet seat 52. In this embodiment, there are two mounting portions 510, which are symmetrically arranged. An avoidance notch 511 is also provided on the edge of the fixing seat 51 for avoiding the mains access plug 2 and the plug output terminal 3, respectively, to facilitate wiring.

[0040] Further, the housing 1 includes a front shell 10 and a rear cover 11, the water outlet 6 is provided at the end of the front shell 10, the sliding water outlet seat 52 is slidably installed in the front shell 10, the fixing seat 51 is installed at one end of the front shell 10 away from the water outlet 6, and the rear cover 11 is threadedly covered on the front shell 10 to fix the fixing seat 51 on the front shell 10. The front shell 10 is also provided with two positioning protrusions 102 for positioning and installing the fixing seat 51, and the positioning protrusions 102 are adapted to be snapped into the avoidance notch 511, so that the fixing seat 51 can be quickly assembled to the front shell 10.

[0041] Furthermore, in order to enable the sliding water outlet seat 52 to slide smoothly and prevent it from shifting, a slide rail 100 is provided in the front shell 10 to guide the sliding water outlet seat 52 to slide, and a slide groove 525 is provided on the sliding water outlet seat 52 to slide in cooperation with the slide rail 100. The cooperation between the slide rail 100 and the slide groove 525 is utilized to limit the sliding water outlet seat 52 to slide only along the slide rail 100, thereby ensuring the normal operation of the sliding water outlet seat 52.

[0042] Furthermore, a fourth sealing ring installation groove 101 is provided on the side wall of the front shell 10 , so that the rear cover 11 can form a sealed connection with the front shell 10 to prevent external impurities from entering the front shell 10 .

[0043] like Fig. 9 and Fig.10As shown, this is the second embodiment of the present invention, which is different from the first embodiment in that the contact device 4 is arranged differently. Specifically, the contact device 4 includes two identical groups of fixed contacts 40 and moving touch plates 42, one group of fixed contacts 40 is electrically connected to the mains access plug 2, and the other group of fixed contacts 40 is electrically connected to the plug output terminal 3, the two groups of fixed contacts 40 are symmetrically arranged on the end surface of the fixed seat 51 facing the sliding water outlet seat 52, and the moving touch plates 42 are arranged on the end surface of the mounting plate 521 of the sliding water outlet seat 52 facing the fixed contacts 40, when the two groups of moving touch plates 42 and the two groups of fixed contacts 40 are in contact one by one, the mains access plug 2 and the plug output terminal 3 are connected, and when the two groups of moving touch plates 42 and the two groups of fixed contacts 40 are disconnected, the mains access plug 2 and the plug output terminal 3 are disconnected. The principle of connecting or disconnecting the mains power access plug 2 and the plug output terminal 3 in this embodiment is the same as that in the first embodiment, except that the mains power access plug 2 and the plug output terminal 3 are electrically connected to the fixing seat 51, and then the mains power access plug 2 and the plug output terminal 3 are connected or disconnected by moving the moving touch plate 42, which should be understood by those skilled in the art.

[0044] In addition, the present invention is also applicable to the modification of old electric water heaters. It can be used by simply connecting the front control valve to the water inlet pipe of the old electric water heater without changing the internal structure or electrical principle of the old electric water heater. The modification cost is low and maintenance is easy.

[0045] The working principle of the present invention is as follows: when the electric water heater needs to store water for heating (when the user is not using it), the water mixing valve of the electric water heater is closed, and the water entering from the water inlet pipe 50 pushes the sliding water outlet seat 52 away from the fixed seat 51, so that the sleeve bottom plate 522 leaves the right end of the water inlet pipe 50, so that the water passes through the water inlet pipe 50, the water outlet gap 523, and the water outlet 6 in sequence and then enters the inner tank of the electric water heater. At this time, since the sliding water outlet seat 52 moves away from the fixed seat 51, the moving contact 41 (or the moving contact plate 42) is disconnected from the fixed contact 40, and the mains access plug 2 and the plug output terminal 3 are also disconnected, and the power is cut off. When the water in the inner tank of the electric water heater is full, since the water pressure in the inner tank of the electric water heater is greater than the water pressure in the water inlet pipe 50, in this case, the sliding water outlet seat 52 moves towards the fixed seat 51 under the action of the water pressure in the inner tank of the electric water heater until the sleeve bottom plate 522 is pressed against the right end of the water inlet pipe 50, so that the water inlet pipe 50 and the water outlet 6 are blocked. At this time, the moving contact 41 (or the moving contact plate 42) provided on the sliding water outlet seat 52 contacts the fixed contact 40, so that the AC power access plug 2 and the plug output terminal 3 are connected. At this time, the entire electric water heater is in a powered-on state to heat the water in the inner tank. During the process of heating water by the electric water heater or after the heating is completed, when the user needs to use hot water, when the user opens the mixing valve of the electric water heater, the hot water in the inner tank of the electric water heater has a tendency to flow out when the mixing valve is opened, so that the water pressure in the inner tank is reduced. At this time, the water pressure of the water inlet pipe 50 is greater than the water pressure in the inner tank of the electric water heater again. At this time, the water entering the water inlet pipe 50 pushes the sliding water outlet seat 52 away from the fixed seat 51 again, so that the sleeve bottom plate 522 leaves the right end of the water inlet pipe 50 again. At this time, the movable contact 41 (or movable contact plate 42) provided on the sliding water outlet seat 52 and the fixed contact 40 change from a contact state to a disconnected state, so that the mains access plug 2 and the plug output terminal 3 are disconnected, and the water entering from the water inlet pipe 50 flows into the inner tank of the electric water heater through the water outlet gap 523 and the water outlet 6 in turn, thereby achieving the purpose of powering off and discharging water, and powering on and stopping water discharging. When the user has finished using water and closes the mixing valve, the water inlet pipe 50 continues to take in water to replenish the inner tank of the electric water heater until the inner tank of the electric water heater is full of water. The sliding water outlet seat 52 moves again towards the fixed seat 51 under the action of the water pressure in the inner tank until the sleeve bottom plate 522 is once again pressed against the right end of the water inlet pipe 50. At this time, the inner tank of the electric water heater stops taking in water, and the moving contact 41 (or moving contact plate 42) provided on the sliding water outlet seat 52 contacts the fixed contact 40 again, so that the AC power access plug 2 and the plug output terminal 3 are connected, so that the entire electric water heater is in a powered-on state to heat the water in the inner tank.

[0046] In summary, the present invention, through reasonable structural improvement, allows the mains access plug 2 and the plug output terminal 3 to be automatically blocked when discharging water, and allows the mains access plug 2 and the plug output terminal 3 to be automatically connected after the water is stopped, so as to realize the function of power-off water discharge, and at the same time, it also has the characteristics of rapid response, convenient and quick use, safety and reliability, and low cost. The present invention can also be flexibly installed on other water heaters. Since the installation of the present invention does not require the electric water heater to be disassembled, it is convenient to upgrade and transform. In this way, the existing electric water heater lacking the leakage protection function can be easily added with the power-off water discharge function by externally connecting the required water heater with such a mechanical front control valve. Especially for those old electric water heaters that are prone to leakage and are still in large quantities, ordinary leakage protection plugs face the possibility of failure of the leakage protection function or untimely leakage protection due to aging of electronic components. The present invention can improve safety, extend the service life of the electric water heater, and ensure the user's bathing safety and use experience.

[0047] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A mechanical front control valve with automatic power-off water discharge function, characterized in that: The invention comprises a housing (1), a mains power access plug (2), a plug output terminal (3), a contact device (4), and a power-off water outlet control device (5) installed in the housing (1); a water outlet (6) for connecting to an inner tank of the electric water heater is provided at the end of the housing (1); the contact device (4) is used to control the connection or disconnection of the mains power access plug (2) and the plug output terminal (3); and the power-off water outlet control device (5) is movably connected to the water outlet (6); The power-off water outlet control device (5) comprises a water inlet pipe (50), a fixed seat (51) and a sliding water outlet seat (52), wherein the water inlet pipe (50) is arranged to penetrate the fixed seat (51), and the sliding water outlet seat (52) is slidably sleeved with the water inlet pipe (50) so that the water inlet pipe (50) and the water outlet (6) are connected or blocked; The contact device (4) comprises a fixed contact (40) and a moving contact (41); the fixed contact (40) is electrically connected to the mains power access plug (2); the moving contact (41) is electrically connected to the plug output terminal (3); the fixed contact (40) is arranged on an end surface of the fixed seat (51) facing the sliding water outlet seat (52); the moving contact (41) is arranged on an end surface of the sliding water outlet seat (52) facing the fixed contact (40); when the moving contact (41) and the fixed contact (40) are in contact, the mains power access plug (2) and the plug output terminal (3) are connected; when the moving contact (41) and the fixed contact (40) are disconnected, the mains power access plug (2) and the plug output terminal (3) are disconnected; The sliding water outlet seat (52) comprises a sleeve (520) adapted to fit the outer sleeve water inlet pipe (50), a mounting plate (521) for mounting the moving contact (41), and a sleeve bottom plate (522) for sealing the water inlet pipe (50); the mounting plate (521) is arranged at one end of the sleeve (520) away from the sleeve bottom plate (522); a water outlet gap (523) for connecting the water inlet pipe (50) and the water outlet (6) is arranged on the side wall of the sleeve (520) close to the sleeve bottom plate (522); the water outlet gap (523) is arranged around the side wall of the sleeve (520); A first sealing ring installation groove (524) for installing a sealing ring is also provided on the side wall of the sleeve (520), and a second sealing ring installation groove (500) and a third sealing ring installation groove (501) are provided on the side wall of the water inlet pipe (50) embedded in one end of the sleeve (520).

2. The mechanical front control valve with automatic power-off water discharge function according to claim 1 is characterized in that: One end of the water inlet pipe (50) embedded in the sleeve (520) is also coaxially sleeved with a return spring (7), one end of the return spring (7) abuts against the fixing seat (51), and the other end of the return spring (7) abuts against the mounting plate (521).

3. The mechanical front control valve with automatic power-off water discharge function according to claim 1 is characterized in that: An installation portion (510) for positioning and installing a fixed contact (40) is provided on the end surface of the fixed seat (51) facing the sliding water outlet seat (52), and an avoidance notch (511) for avoiding the mains power access plug (2) and the plug output end (3) is also provided on the edge of the fixed seat (51).

4. The mechanical front control valve with automatic power-off water discharge function according to claim 1 is characterized in that: The contact device (4) comprises two groups of identical fixed contacts (40) and a moving touch plate (42); the one group of fixed contacts (40) is electrically connected to the mains power access plug (2), and the other group of fixed contacts (40) is electrically connected to the plug output terminal (3); the two groups of fixed contacts (40) are symmetrically arranged on the end surface of the fixed seat (51) facing the sliding water outlet seat (52); the moving touch plate (42) is arranged on the end surface of the sliding water outlet seat (52) facing the fixed contacts (40); when the two groups of moving touch plates (42) and the two groups of fixed contacts (40) are in contact one by one, the mains power access plug (2) and the plug output terminal (3) are connected; when the two groups of moving touch plates (42) and the two groups of fixed contacts (40) are disconnected, the mains power access plug (2) and the plug output terminal (3) are disconnected.

5. The mechanical front control valve with automatic power-off and water-discharging function according to any one of claims 1 to 4, characterized in that: The housing (1) comprises a front shell (10) and a rear cover (11); the water outlet (6) is arranged at the end of the front shell (10); the sliding water outlet seat (52) is slidably mounted in the front shell (10); the fixing seat (51) is mounted at an end of the front shell (10) away from the water outlet (6); and the rear cover (11) is threadedly covered on the front shell (10) so that the fixing seat (51) is fixed on the front shell (10).

6. The mechanical front control valve with automatic power-off water discharge function according to claim 5, characterized in that: A slide rail (100) for guiding the sliding water outlet seat (52) to slide is provided in the front shell (10), and a slide groove (525) for sliding in cooperation with the slide rail (100) is provided on the sliding water outlet seat (52).

7. The mechanical front control valve with automatic power-off and water-discharging function according to claim 5 is characterized in that: A fourth sealing ring installation groove (101) is provided on the side wall of the front shell (10).

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